Add release v1.4.2

Allow plugin to keep running on 'weave launch'

.gitignore

@@ -39,24 +39,31 @@ prog/weavehosts/weavehosts
 prog/weaveproxy/weaveproxy
 prog/sigproxy/sigproxy
 prog/weavewait/weavewait
+prog/weavewait/weavewait_noop
+prog/weavewait/weavewait_nomcast
 prog/netcheck/netcheck
 prog/docker_tls_args/docker_tls_args
+prog/plugin/plugin
 testing/cover/cover
 testing/runner/runner
 releases
 .weaver.uptodate
 .weavedns.uptodate
 .weaveexec.uptodate
-weave.tar
+.dockerplugin.uptodate
+weave.tar.gz
 prog/weaveexec/weave
 prog/weaveexec/weavehosts
 prog/weaveexec/weaveproxy
 prog/weaveexec/weavewait
+prog/weaveexec/weavewait_noop
+prog/weaveexec/weavewait_nomcast
 prog/weaveexec/sigproxy
 prog/weaveexec/netcheck
 prog/weaveexec/docker_tls_args
 prog/weaveexec/docker*.tgz
 Vagrantfile.local
+test/tls/tls
 test/tls/*.pem
 test/coverage
 test/coverage.*

CHANGELOG.md

@@ -1,3 +1,83 @@
+## Release 1.4.2
+
+Bug-fixes and minor improvements.
+
+* A race condition in weavewait that would occasionally hang
+  containers at startup #1882/#1884
+* Having the plugin auto-restart prevents successful `weave launch` on
+  reboot #1869
+* Work round weave router failure on CoreOS 4.3 caused by kernel bug
+  #1854
+* `weave launch` would exit with error code on docker <1.9 #1851
+* Running `eval $(weave env)` multiple times would break `eval $(weave
+  env --restore)` #1824/#1825
+* Don't complain in `weave stop` about "Plugin is not running" when
+  plugin is not enabled #1840/#1841
+* `weave --local launch` would fail if utility program
+  `docker_tls_args` could not be found #1844
+* Improved error reporting when TLS arg detection fails #1843
+* Improve error reporting when docker isn't running #1845
+* Add `--trusted-subnets` usage to `weave` script #1842
+* weave run can hang under rare combinations of options #1858
+
+## Release 1.4.1
+
+This is a bug-fix release to cover a few issues that came up since the
+release of 1.4.0.
+
+* Weave would fail to launch when `$DOCKER_HOST` was set to a TCP socket secured with TLS #1820/#1822
+* Weave would fail to stop when run against Docker pre-1.9 #1815/#1817
+* Issue a warning instead of failing on `--with-dns` option to proxy, which was removed #1810/#1812
+* Make `weave version` show the plugin version #1797/#1813
+* Make `weave launch` show when the a container is restarting #1778/#1814
+* Make `weave launch` fail if the plugin is running, for consistency with router and proxy. #1818/#1819
+
+More details in the [change log](https://github.com/weaveworks/weave/issues?q=milestone%3A1.4.1).
+
+## Release 1.4.0
+
+**Highlights**
+
+* The Docker Network plugin can now operate without a cluster store, so it is now run by default.
+* You can now use the fast datapath over trusted links and Weave encryption over untrusted links, in the same network.
+
+Plus many bug fixes and minor enhancements. More details below and in
+the [change log](https://github.com/weaveworks/weave/issues?q=milestone%3A1.4.0).
+
+## Release 1.3.1
+
+**Highlights**
+
+* The minimum Docker version has been increased to 1.6 due to the
+  [upcoming deprecation of Dockerhub access](https://blog.docker.com/2015/10/docker-hub-deprecation-1-5/)
+  for old clients. From December 7th onwards previous versions of the
+  `weave` script will fail to pull down images from the hub; if you
+  are unable to upgrade to 1.3.1 immediately you can work around this
+  by running `weave --local setup` in conjunction with a compatible
+  Docker client installation
+* Docker networking plugin now works with older kernels and allows you
+  to configure the MTU
+
+More details in the
+[change log](https://github.com/weaveworks/weave/issues?q=milestone%3A1.3.1).
+
+## Release 1.3.0
+
+**Highlights**
+
+This release includes a Docker Plugin, so you have the option to use
+Weave Net that way. More details in the
+[change log](https://github.com/weaveworks/weave/issues?q=milestone%3A1.3.0).
+
+## Release 1.2.1
+
+This release contains a number of bug fixes and minor
+enhancements. More details in the
+[change log](https://github.com/weaveworks/weave/issues?q=milestone%3A1.2.1).
+
+The release is fully compatible with 1.2.0 versions, so existing
+clusters can be upgraded incrementally.
+
 ## Release 1.2.0
 
 **Highlights**

Makefile

@@ -1,4 +1,4 @@
-PUBLISH=publish_weave publish_weaveexec
+PUBLISH=publish_weave publish_weaveexec publish_plugin
 
 .DEFAULT: all
 .PHONY: all update tests lint publish $(PUBLISH) clean clean-bin prerequisites build travis run-smoketests
@@ -13,25 +13,31 @@ WEAVER_EXE=prog/weaver/weaver
 WEAVEPROXY_EXE=prog/weaveproxy/weaveproxy
 SIGPROXY_EXE=prog/sigproxy/sigproxy
 WEAVEWAIT_EXE=prog/weavewait/weavewait
+WEAVEWAIT_NOOP_EXE=prog/weavewait/weavewait_noop
+WEAVEWAIT_NOMCAST_EXE=prog/weavewait/weavewait_nomcast
 NETCHECK_EXE=prog/netcheck/netcheck
 DOCKERTLSARGS_EXE=prog/docker_tls_args/docker_tls_args
-RUNNER_EXE=testing/runner/runner
+DOCKERPLUGIN_EXE=prog/plugin/plugin
+RUNNER_EXE=tools/runner/runner
+TEST_TLS_EXE=test/tls/tls
 
-EXES=$(WEAVER_EXE) $(SIGPROXY_EXE) $(WEAVEPROXY_EXE) $(WEAVEWAIT_EXE) $(NETCHECK_EXE) $(DOCKERTLSARGS_EXE) $(RUNNER_EXE)
+EXES=$(WEAVER_EXE) $(SIGPROXY_EXE) $(WEAVEPROXY_EXE) $(WEAVEWAIT_EXE) $(WEAVEWAIT_NOOP_EXE) $(WEAVEWAIT_NOMCAST_EXE) $(NETCHECK_EXE) $(DOCKERTLSARGS_EXE) $(DOCKERPLUGIN_EXE) $(TEST_TLS_EXE)
 
 WEAVER_UPTODATE=.weaver.uptodate
 WEAVEEXEC_UPTODATE=.weaveexec.uptodate
+DOCKERPLUGIN_UPTODATE=.dockerplugin.uptodate
 
-IMAGES_UPTODATE=$(WEAVER_UPTODATE) $(WEAVEEXEC_UPTODATE)
+IMAGES_UPTODATE=$(WEAVER_UPTODATE) $(WEAVEEXEC_UPTODATE) $(DOCKERPLUGIN_UPTODATE)
 
 WEAVER_IMAGE=$(DOCKERHUB_USER)/weave
 WEAVEEXEC_IMAGE=$(DOCKERHUB_USER)/weaveexec
+DOCKERPLUGIN_IMAGE=$(DOCKERHUB_USER)/plugin
 
-IMAGES=$(WEAVER_IMAGE) $(WEAVEEXEC_IMAGE)
+IMAGES=$(WEAVER_IMAGE) $(WEAVEEXEC_IMAGE) $(DOCKERPLUGIN_IMAGE)
 
-WEAVE_EXPORT=weave.tar
+WEAVE_EXPORT=weave.tar.gz
 
-WEAVEEXEC_DOCKER_VERSION=1.3.1
+WEAVEEXEC_DOCKER_VERSION=1.6.2
 DOCKER_DISTRIB=prog/weaveexec/docker-$(WEAVEEXEC_DOCKER_VERSION).tgz
 DOCKER_DISTRIB_URL=https://get.docker.com/builds/Linux/x86_64/docker-$(WEAVEEXEC_DOCKER_VERSION).tgz
 NETGO_CHECK=@strings $@ | grep cgo_stub\\\.go >/dev/null || { \
@@ -46,7 +52,7 @@ BUILD_FLAGS=-ldflags "-extldflags \"-static\" -X main.version $(WEAVE_VERSION)"
 
 PACKAGE_BASE=$(shell go list -e ./)
 
-all: $(WEAVE_EXPORT) $(RUNNER_EXE)
+all: $(WEAVE_EXPORT) $(RUNNER_EXE) $(TEST_TLS_EXE)
 
 travis: $(EXES)
 
@@ -69,38 +75,56 @@ $(NETCHECK_EXE): common/*.go common/*/*.go net/*.go
 	go build $(BUILD_FLAGS) -o $@ ./$(@D)
 	$(NETGO_CHECK)
 
-$(WEAVER_EXE): router/*.go ipam/*.go ipam/*/*.go nameserver/*.go prog/weaver/*.go
+$(WEAVER_EXE): router/*.go mesh/*.go ipam/*.go ipam/*/*.go nameserver/*.go prog/weaver/*.go
 $(WEAVEPROXY_EXE): proxy/*.go prog/weaveproxy/main.go
 $(NETCHECK_EXE): prog/netcheck/netcheck.go
 
-# Sigproxy and weavewait need separate rules as they fail the netgo check in
+# These next programs need separate rules as they fail the netgo check in
 # the main build stanza due to not importing net package
 $(SIGPROXY_EXE): prog/sigproxy/main.go
-$(WEAVEWAIT_EXE): prog/weavewait/main.go net/*.go
-$(RUNNER_EXE): testing/runner/runner.go
 $(DOCKERTLSARGS_EXE): prog/docker_tls_args/*.go
+$(DOCKERPLUGIN_EXE): prog/plugin/*.go plugin/net/*.go plugin/ipam/*.go plugin/skel/*.go api/*.go common/docker/*.go
+$(TEST_TLS_EXE): test/tls/*.go
 
-$(WEAVEWAIT_EXE) $(SIGPROXY_EXE) $(RUNNER_EXE) $(DOCKERTLSARGS_EXE):
+$(SIGPROXY_EXE) $(DOCKERTLSARGS_EXE) $(DOCKERPLUGIN_EXE) $(TEST_TLS_EXE):
+	go get -tags netgo ./$(@D)
+	go build $(BUILD_FLAGS) -o $@ ./$(@D)
+
+$(WEAVEWAIT_EXE): prog/weavewait/*.go net/*.go
+	go get -tags netgo ./$(@D)
+	go build $(BUILD_FLAGS) -tags "netgo iface mcast" -o $@ ./$(@D)
+
+$(WEAVEWAIT_NOMCAST_EXE): prog/weavewait/*.go net/*.go
+	go get -tags netgo ./$(@D)
+	go build $(BUILD_FLAGS) -tags "netgo iface" -o $@ ./$(@D)
+
+$(WEAVEWAIT_NOOP_EXE): prog/weavewait/*.go
 	go get -tags netgo ./$(@D)
 	go build $(BUILD_FLAGS) -o $@ ./$(@D)
 
 $(WEAVER_UPTODATE): prog/weaver/Dockerfile $(WEAVER_EXE)
-	$(SUDO) docker build -t $(WEAVER_IMAGE) prog/weaver
+	$(SUDO) DOCKER_HOST=$(DOCKER_HOST) docker build -t $(WEAVER_IMAGE) prog/weaver
 	touch $@
 
-$(WEAVEEXEC_UPTODATE): prog/weaveexec/Dockerfile $(DOCKER_DISTRIB) weave $(SIGPROXY_EXE) $(WEAVEPROXY_EXE) $(WEAVEWAIT_EXE) $(NETCHECK_EXE) $(DOCKERTLSARGS_EXE)
+$(WEAVEEXEC_UPTODATE): prog/weaveexec/Dockerfile prog/weaveexec/symlink $(DOCKER_DISTRIB) weave $(SIGPROXY_EXE) $(WEAVEPROXY_EXE) $(WEAVEWAIT_EXE) $(WEAVEWAIT_NOOP_EXE) $(WEAVEWAIT_NOMCAST_EXE) $(NETCHECK_EXE) $(DOCKERTLSARGS_EXE)
 	cp weave prog/weaveexec/weave
 	cp $(SIGPROXY_EXE) prog/weaveexec/sigproxy
 	cp $(WEAVEPROXY_EXE) prog/weaveexec/weaveproxy
 	cp $(WEAVEWAIT_EXE) prog/weaveexec/weavewait
+	cp $(WEAVEWAIT_NOOP_EXE) prog/weaveexec/weavewait_noop
+	cp $(WEAVEWAIT_NOMCAST_EXE) prog/weaveexec/weavewait_nomcast
 	cp $(NETCHECK_EXE) prog/weaveexec/netcheck
 	cp $(DOCKERTLSARGS_EXE) prog/weaveexec/docker_tls_args
 	cp $(DOCKER_DISTRIB) prog/weaveexec/docker.tgz
-	$(SUDO) docker build -t $(WEAVEEXEC_IMAGE) prog/weaveexec
+	$(SUDO) DOCKER_HOST=$(DOCKER_HOST) docker build -t $(WEAVEEXEC_IMAGE) prog/weaveexec
+	touch $@
+
+$(DOCKERPLUGIN_UPTODATE): prog/plugin/Dockerfile $(DOCKERPLUGIN_EXE)
+	$(SUDO) docker build -t $(DOCKERPLUGIN_IMAGE) prog/plugin
 	touch $@
 
 $(WEAVE_EXPORT): $(IMAGES_UPTODATE)
-	$(SUDO) docker save $(addsuffix :latest,$(IMAGES)) > $@
+	$(SUDO) DOCKER_HOST=$(DOCKER_HOST) docker save $(addsuffix :latest,$(IMAGES)) | gzip > $@
 
 $(DOCKER_DISTRIB):
 	curl -o $(DOCKER_DISTRIB) $(DOCKER_DISTRIB_URL)
@@ -114,17 +138,20 @@ lint: tools/.git
 tools/.git:
 	git submodule update --init
 
+$(RUNNER_EXE): tools/.git
+	make -C tools/runner
+
 $(PUBLISH): publish_%: $(IMAGES_UPTODATE)
-	$(SUDO) docker tag -f $(DOCKERHUB_USER)/$* $(DOCKERHUB_USER)/$*:$(WEAVE_VERSION)
-	$(SUDO) docker push   $(DOCKERHUB_USER)/$*:$(WEAVE_VERSION)
+	$(SUDO) DOCKER_HOST=$(DOCKER_HOST) docker tag -f $(DOCKERHUB_USER)/$* $(DOCKERHUB_USER)/$*:$(WEAVE_VERSION)
+	$(SUDO) DOCKER_HOST=$(DOCKER_HOST) docker push   $(DOCKERHUB_USER)/$*:$(WEAVE_VERSION)
 ifneq ($(UPDATE_LATEST),false)
-	$(SUDO) docker push   $(DOCKERHUB_USER)/$*:latest
+	$(SUDO) DOCKER_HOST=$(DOCKER_HOST) docker push   $(DOCKERHUB_USER)/$*:latest
 endif
 
 publish: $(PUBLISH)
 
 clean-bin:
-	-$(SUDO) docker rmi $(IMAGES)
+	-$(SUDO) DOCKER_HOST=$(DOCKER_HOST) docker rmi $(IMAGES)
 	go clean -r $(addprefix ./,$(dir $(EXES)))
 	rm -f $(EXES) $(IMAGES_UPTODATE) $(WEAVE_EXPORT)
 

README.md

@@ -41,7 +41,7 @@ capabilities, so these can continue to be used by containers.
 ## Installation
 
 Ensure you are running Linux (kernel 3.8 or later) and have Docker
-(version 1.3.1 or later) installed. Then install weave with
+(version 1.6.0 or later) installed. Then install weave with
 
     sudo curl -L git.io/weave -o /usr/local/bin/weave
     sudo chmod a+x /usr/local/bin/weave

api/dns.go

@@ -0,0 +1,18 @@
+package api
+
+import (
+	"fmt"
+	"net/url"
+)
+
+func (client *Client) RegisterWithDNS(ID string, fqdn string, ip string) error {
+	data := url.Values{}
+	data.Add("fqdn", fqdn)
+	_, err := client.httpVerb("PUT", fmt.Sprintf("/name/%s/%s", ID, ip), data)
+	return err
+}
+
+func (client *Client) DeregisterWithDNS(ID string, ip string) error {
+	_, err := client.httpVerb("DELETE", fmt.Sprintf("/name/%s/%s", ID, ip), nil)
+	return err
+}

api/ipam.go

@@ -0,0 +1,49 @@
+package api
+
+import (
+	"fmt"
+	"net"
+)
+
+func (client *Client) ipamOp(ID string, op string) (*net.IPNet, error) {
+	ip, err := client.httpVerb(op, fmt.Sprintf("/ip/%s", ID), nil)
+	if err != nil {
+		return nil, err
+	}
+	return parseIP(ip)
+}
+
+// returns an IP for the ID given, allocating a fresh one if necessary
+func (client *Client) AllocateIP(ID string) (*net.IPNet, error) {
+	return client.ipamOp(ID, "POST")
+}
+
+// returns an IP for the ID given, or nil if one has not been
+// allocated
+func (client *Client) LookupIP(ID string) (*net.IPNet, error) {
+	return client.ipamOp(ID, "GET")
+}
+
+// release an IP which is no longer needed
+func (client *Client) ReleaseIP(ID string) error {
+	_, err := client.ipamOp(ID, "DELETE")
+	return err
+}
+
+func (client *Client) DefaultSubnet() (*net.IPNet, error) {
+	cidr, err := client.httpVerb("GET", fmt.Sprintf("/ipinfo/defaultsubnet"), nil)
+	if err != nil {
+		return nil, err
+	}
+	_, ipnet, err := net.ParseCIDR(cidr)
+	return ipnet, err
+}
+
+func parseIP(body string) (*net.IPNet, error) {
+	ip, ipnet, err := net.ParseCIDR(string(body))
+	if err != nil {
+		return nil, err
+	}
+	ipnet.IP = ip
+	return ipnet, nil
+}

api/weaveapi.go

@@ -0,0 +1,73 @@
+package api
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"strings"
+
+	. "github.com/weaveworks/weave/common"
+)
+
+const (
+	WeaveHttpPort = 6784
+)
+
+type Client struct {
+	baseUrl string
+	resolve func() (string, error)
+}
+
+func (client *Client) httpVerb(verb string, url string, values url.Values) (string, error) {
+	baseUrl := client.baseUrl
+	if client.resolve != nil {
+		addr, err := client.resolve()
+		if err != nil {
+			return "", err
+		}
+		baseUrl = fmt.Sprintf("http://%s:%d", addr, WeaveHttpPort)
+	}
+	url = baseUrl + url
+	Log.Debugf("weave %s to %s with %v", verb, url, values)
+	var body io.Reader
+	if values != nil {
+		body = strings.NewReader(values.Encode())
+	}
+	req, err := http.NewRequest(verb, url, body)
+	if err != nil {
+		return "", err
+	}
+	if values != nil {
+		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	}
+	if resp, err := http.DefaultClient.Do(req); err != nil {
+		return "", err
+	} else {
+		defer resp.Body.Close()
+		body, err := ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return "", err
+		}
+		if resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusNoContent {
+			return string(body), nil
+		} else {
+			return "", errors.New(resp.Status + ": " + string(body))
+		}
+	}
+}
+
+func NewClient(addr string) *Client {
+	return &Client{baseUrl: fmt.Sprintf("http://%s:%d", addr, WeaveHttpPort)}
+}
+
+func NewClientWithResolver(resolver func() (string, error)) *Client {
+	return &Client{resolve: resolver}
+}
+
+func (client *Client) Connect(remote string) error {
+	_, err := client.httpVerb("POST", "/connect", url.Values{"peer": {remote}})
+	return err
+}

bin/multiweave

@@ -29,6 +29,7 @@ random_mac() {
 case "$1" in
     launch)
         shift 1
+        echo $(date -R) launching
         for i in $(seq $START $FINISH); do
             WEAVE_CONTAINER_NAME=weave$i WEAVE_PORT=$((5000+i)) $weavedir/weave launch-router --iface '' --name $(random_mac) --nickname weave$i --port $PORT --no-dns "$@"
         done
@@ -36,6 +37,7 @@ case "$1" in
             status=$(docker inspect --format='{{.State.Running}} {{.NetworkSettings.IPAddress}}' weave$((START-1)))
             PREV="${status#true }"
         fi
+        echo $(date -R) connecting
         for i in $(seq $START $FINISH); do
             if [ -n "$PREV" ] ; then
                 echo connecting weave$i to $PREV
@@ -44,6 +46,7 @@ case "$1" in
             status=$(docker inspect --format='{{.State.Running}} {{.NetworkSettings.IPAddress}}' weave$i)
             PREV="${status#true }"
         done
+        echo $(date -R) done
         ;;
     stop)
         for i in $(seq $START $FINISH); do

build/Dockerfile

@@ -3,7 +3,7 @@ FROM ubuntu
 RUN apt-get -y update && apt-get -y install --no-install-recommends ca-certificates apt-transport-https
 RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
 RUN echo deb https://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list
-RUN apt-get -y update && apt-get -y install --no-install-recommends build-essential git lxc-docker-1.3.1 mercurial libpcap-dev curl make pkg-config gcc bison flex python-requests
+RUN apt-get -y update && apt-get -y install --no-install-recommends build-essential git lxc-docker-1.6.2 mercurial libpcap-dev curl make pkg-config gcc bison flex python-requests
 
 # When doing a build in a container, "apt-get update" happens twice,
 # which can be a very significant overhead for incremental builds.

circle.yml

@@ -27,13 +27,10 @@ dependencies:
         docker save weaveworks/weave-test >$WEAVE_TEST;
       fi
   post:
-    - sudo apt-get update
-    - sudo apt-get install bc jq
-    - pip install requests
+    - sudo apt-get update && sudo apt-get install bc jq && pip install requests
     - curl https://sdk.cloud.google.com | bash
     - bin/setup-circleci-secrets "$SECRET_PASSWORD"
-    - mkdir -p $(dirname $SRCDIR)
-    - cp -r $(pwd)/ $SRCDIR
+    - mkdir -p $(dirname $SRCDIR) && cp -r $(pwd)/ $SRCDIR
     - cd $SRCDIR/test; ./gce.sh make_template:
         parallel: false
 
@@ -45,9 +42,7 @@ test:
         parallel: true
     - docker run -v /var/run/docker.sock:/run/docker.sock -v /home/ubuntu:/home/go -e COVERAGE=true weaveworks/weave-build:
         parallel: true
-    - cd $SRCDIR/test; ./gce.sh setup:
-        parallel: true
-    - cd $SRCDIR/test; eval $(./gce.sh hosts); ./setup.sh:
+    - cd $SRCDIR/test; ./gce.sh setup && eval $(./gce.sh hosts) && ./setup.sh:
         parallel: true
     - cd $SRCDIR/test; eval $(./gce.sh hosts); export COVERAGE=true; ./run_all.sh:
         parallel: true

common/docker/client.go

@@ -1,7 +1,12 @@
 package docker
 
 import (
-	"github.com/fsouza/go-dockerclient"
+	"errors"
+	"fmt"
+	"strings"
+
+	docker "github.com/fsouza/go-dockerclient"
+
 	. "github.com/weaveworks/weave/common"
 )
 
@@ -17,32 +22,52 @@ type Client struct {
 
 // NewClient creates a new Docker client and checks we can talk to Docker
 func NewClient(apiPath string) (*Client, error) {
+	if apiPath != "" && !strings.Contains(apiPath, "://") {
+		apiPath = "tcp://" + apiPath
+	}
 	dc, err := docker.NewClient(apiPath)
 	if err != nil {
 		return nil, err
 	}
 	client := &Client{dc}
 
-	return client, client.checkWorking(apiPath)
+	return client, client.checkWorking()
 }
 
 func NewVersionedClient(apiPath string, apiVersionString string) (*Client, error) {
+	if !strings.Contains(apiPath, "://") {
+		apiPath = "tcp://" + apiPath
+	}
 	dc, err := docker.NewVersionedClient(apiPath, apiVersionString)
 	if err != nil {
 		return nil, err
 	}
 	client := &Client{dc}
 
-	return client, client.checkWorking(apiPath)
+	return client, client.checkWorking()
 }
 
-func (c *Client) checkWorking(apiPath string) error {
-	env, err := c.Version()
+func NewVersionedClientFromEnv(apiVersionString string) (*Client, error) {
+	dc, err := docker.NewVersionedClientFromEnv(apiVersionString)
 	if err != nil {
-		return err
+		return nil, err
+	}
+	client := &Client{dc}
+
+	return client, client.checkWorking()
+}
+
+func (c *Client) checkWorking() error {
+	_, err := c.Version()
+	return err
+}
+
+func (c *Client) Info() string {
+	if env, err := c.Version(); err != nil {
+		return fmt.Sprintf("Docker API error: %s", err)
+	} else {
+		return fmt.Sprintf("Docker API on %s: %v", c.Endpoint(), env)
 	}
-	Log.Infof("[docker] Using Docker API on %s: %v", apiPath, env)
-	return nil
 }
 
 // AddObserver adds an observer for docker events
@@ -80,3 +105,28 @@ func (c *Client) IsContainerNotRunning(idStr string) bool {
 	Log.Errorf("[docker] Could not check container status: %s", err)
 	return false
 }
+
+// This is intended to find an IP address that we can reach the container on;
+// if it is on the Docker bridge network then that address; if on the host network
+// then localhost
+func (c *Client) GetContainerIP(nameOrID string) (string, error) {
+	Log.Debugf("Getting IP for container %s", nameOrID)
+	info, err := c.InspectContainer(nameOrID)
+	if err != nil {
+		return "", err
+	}
+	if info.NetworkSettings.Networks != nil {
+		Log.Debugln("Networks: ", info.NetworkSettings.Networks)
+		if bridgeNetwork, ok := info.NetworkSettings.Networks["bridge"]; ok {
+			return bridgeNetwork.IPAddress, nil
+		} else if _, ok := info.NetworkSettings.Networks["host"]; ok {
+			return "127.0.0.1", nil
+		}
+	} else if info.HostConfig.NetworkMode == "host" {
+		return "127.0.0.1", nil
+	}
+	if info.NetworkSettings.IPAddress == "" {
+		return "", errors.New("No IP address found for container " + nameOrID)
+	}
+	return info.NetworkSettings.IPAddress, nil
+}

common/logging.go

@@ -52,3 +52,15 @@ func SetLogLevel(levelname string) {
 	}
 	Log.Level = level
 }
+
+func CheckFatal(e error) {
+	if e != nil {
+		Log.Fatal(e)
+	}
+}
+
+func CheckWarn(e error) {
+	if e != nil {
+		Log.Warnln(e)
+	}
+}

common/odp/odp.go

@@ -0,0 +1,93 @@
+package odp
+
+import (
+	"fmt"
+	"net"
+	"syscall"
+
+	"github.com/weaveworks/go-odp/odp"
+)
+
+// ODP admin functionality
+
+func CreateDatapath(dpname string) (err error, supported bool) {
+	dpif, err := odp.NewDpif()
+	if err != nil {
+		if odp.IsKernelLacksODPError(err) {
+			return nil, false
+		}
+
+		return err, true
+	}
+
+	defer dpif.Close()
+
+	dp, err := dpif.CreateDatapath(dpname)
+	if err != nil && !odp.IsDatapathNameAlreadyExistsError(err) {
+		return err, true
+	}
+
+	// Pick an ephemeral port number to use in probing for vxlan
+	// support.
+	udpconn, err := net.ListenUDP("udp4", nil)
+	if err != nil {
+		return err, true
+	}
+
+	// we leave the UDP socket open, so creating a vxlan vport on
+	// the same port number should fail.  But that's fine: It's
+	// still sufficient to probe for support.
+	portno := uint16(udpconn.LocalAddr().(*net.UDPAddr).Port)
+	vpid, err := dp.CreateVport(odp.NewVxlanVportSpec(
+		fmt.Sprintf("vxlan-%d", portno), portno))
+	if nlerr, ok := err.(odp.NetlinkError); ok {
+		if syscall.Errno(nlerr) == syscall.EAFNOSUPPORT {
+			dp.Delete()
+			return fmt.Errorf("kernel does not have Open vSwitch VXLAN support"), false
+		}
+	}
+
+	if err == nil {
+		dp.DeleteVport(vpid)
+	}
+
+	udpconn.Close()
+	return nil, true
+}
+
+func DeleteDatapath(dpname string) error {
+	dpif, err := odp.NewDpif()
+	if err != nil {
+		return err
+	}
+
+	defer dpif.Close()
+
+	dp, err := dpif.LookupDatapath(dpname)
+	if err != nil {
+		if odp.IsNoSuchDatapathError(err) {
+			return nil
+		}
+
+		return err
+	}
+
+	return dp.Delete()
+}
+
+func AddDatapathInterface(dpname string, ifname string) error {
+	dpif, err := odp.NewDpif()
+	if err != nil {
+		return err
+	}
+
+	defer dpif.Close()
+
+	dp, err := dpif.LookupDatapath(dpname)
+	if err != nil {
+		return err
+	}
+
+	_, err = dp.CreateVport(odp.NewNetdevVportSpec(ifname))
+	return err
+}

docs/fastdp.md

@@ -0,0 +1,170 @@
+# Overlay Method Selection
+
+Weave automatically selects the best working overlay implementation
+when connecting to a new peer. It does this by initiating both
+forwarders in parallel, eventually settling on the most preferred
+established forwarder at which point the other forwarder is shut down,
+assuming it had not failed already. In the event that the remaining
+forwarder fails at a later time (e.g. because of a heartbeat timeout)
+the control plane TCP connection will recycle allowing the selection
+algorithm to run again. By default fast datapath is preferred over
+Sleeve.
+
+# Local Bridging
+
+Unlike the weave bridge netdev used by Sleeve, the OVS datapath has no
+inherent bridging capability. Consequently fastdp implements an
+ethernet bridge in addition to the vxlan overlay, maintaining its own
+forwarding database by learning MAC addresses and dispatching
+broadcast, unicast & multicast traffic accordingly.
+
+# Short Peer IDs
+
+The router relies on having access to the source and destination peer
+when deciding how to forward packets. When the Sleeve overlay is in
+use this information is conveyed directly within the encapsulation by
+including the names of the peers in question, a solution not
+accomodated directly by the vxlan wire format. Fortunately vxlan does
+have a twenty four bit segment ID field in the header we can use to
+encode this data - the challenge is to identify peers uniquely with a
+twelve bit identifier instead of the seventeen bytes used by Sleeve.
+In practice this is achieved by peers adopting a random 'short ID' and
+resolving ownership collisions of same via the existing gossip
+mechanism.
+
+# Heartbeats via vxlan
+
+Heartbeats are implemented by sending an encapsulated ethernet frame
+with source and destination MAC addresses of `00:00:00:00:00:00` and a
+payload consisting of the connection UID and total ethernet frame
+length. The vxlan vport miss handler on the receiving side detects the
+all-zero addresses and acknowledges the heartbeat via the TCP control
+channel after validating the connection UID and frame length against
+their expected values.
+
+# PMTU Discovery
+
+The length of the heartbeat ethernet frame is set to the MTU of the
+datapath interface. In the event the vxlan packet is dropped or
+truncated, the heartbeat will not be acknowledged; this lack of
+acknowledgement will cause the peers to fall back to the Sleeve
+overlay, which has a more sophisticated dynamic mechanism for coping
+with low path MTUs.
+
+To avoid triggering this fallback in typical deployments, the datapath
+interface is statically configured with an MTU of 1410 bytes allowing
+it to work with most underlay network provider MTUs, including GCE at
+1460 bytes (the fifty byte difference accomodates the vxlan overhead).
+This value can be overriden by setting `WEAVE_MTU` at launch if
+necessary.
+
+# Virtual Ports
+
+There are three kinds of virtual port associated with the weave
+datapath:
+
+* `internal` - one of these is created automatically, named after the
+  datapath. It corresponds to the network interface of the same name
+  that appears on the host when the datapath is created; it is the
+  ingress/egress port for `weave expose`
+* `netdev` - one for each application container, corresponding to the
+  host end of the veth pair
+* `vxlan` - one for each UDP port on which we are listening for vxlan
+  encapsulated packets. Typically there is only one of these, but
+  there may be more in a network in which peers do not all use the same
+  port configuration
+
+# Misses and Flow Creation
+
+As mentioned above, the datapath has no inherent behaviour - any
+ingressing packet which does not match a flow is passed to a userspace
+miss handler. The miss handler is then responsible for a) instructing
+the datapath to take actions for the packet that caused the miss (for
+example by copying it to one or more ports) and optionally b)
+installing flow rules which will allow the datapath to act on similar
+packets in future without invoking the miss handler.
+
+At a high level the fast datapath implementation can be viewed as a
+set of miss handlers that determine what actions the OVS datapath
+should take based on router topology information, together with some
+additional machinery that manages the expiry of resulting flows when
+that state changes.
+
+When a miss handler is invoked, it has two pieces of context: a byte
+array containing the packet that triggered the miss, and a set of
+'flow keys' that have been extracted from the packet by the kernel
+module. The following flow keys are of interest to weave:
+
+* `InPort` - the identifier of the ingress virtual port
+* `Ethernet` - the source and destination MAC addresses of the
+  ethernet frame
+* `Tunnel` - tunnel identifier (see section on short peer IDs above),
+  and source/dest IPv4 addresses. Only present for ingress via a vxlan
+  vport
+
+Crucially, the router must use this information alone to determine
+which actions to take - this allows the specification of a flow which
+matches these keys and instructs the kernel to take action
+automatically in future without further userspace involvement.
+
+Two actions are of interest:
+
+* `Output` - output the packet to the specified vport
+* `SetTunnel` - update the effective vxlan tunnel parameters. Only
+  required prior to output from a vxlan vport
+
+It is possible to have multiple actions in a flow, so the router can
+for example create a single rule that copies broadcast traffic to all
+'local' vports (save the ingress vport obviously) as well as to vxlan
+vports for onward peers as dictated by the routing topology.
+
+Every flow specified by the router has the following characteristics:
+
+* An `InPort` key matching the ingress vport
+* A `Tunnel` key if the ingress vport is of type vxlan
+* An `Ethernet` key matching the source and destination MAC
+* A list of `Output` (for internal and netdev vports) and
+  `SetTunnel`+`Output` (for vxlan vports) actions
+
+Under certain circumstances the miss handler will instruct the
+datapath to execute a set of actions for a packet without creating a
+corresponding flow:
+
+* When broadcasting packets to discover the path to unknown
+  destination MACs. This condition is transient in the overwhelming
+  majority of cases and so the benefit of creating a flow is
+  outweighed by the need to invalidate it once the MAC is learned
+* When the packet also needs to be forwarded to one or more peers via
+  Sleeve. In this case the router needs to handle all subsequent
+  matching packets as there is no OVS flow action to do it without
+  userspace involvement
+
+# Flow Invalidation
+
+Once a flow has been created for a particular combination of keys, the
+miss handler will never again be invoked for matching packets. It is
+therefore extremely important that we detect events which invalidate
+existing flow actions:
+
+* Addition of netdev vports to the datapath
+* Route invalidation (topology change)
+* Short peer ID collision
+
+The response in each case is the same - delete all flows from the
+datapath, allowing them to be recreated taking into account the
+updated state.
+
+In addition to these event based invalidations there is an expiry
+process that executes every five minutes. This process enumerates all
+flows in the datapath, removing any which have not been used since the
+last check; this cleans up:
+
+* Flows referring to netdev vports which have been removed
+* Flows created by forwarders which have been stopped
+* Flows related to MAC addresses which have not communicated recently
+
+Flows keyed on tunnel IPv4 address do not need to be cleared when a
+peer appears to change IP address due to NAT; this will cause a miss
+resulting in a new flow, and the old flow will expire naturally via
+the timer mechanism.
+

ipam/allocate.go

@@ -38,6 +38,11 @@ func (g *allocate) Try(alloc *Allocator) bool {
 	alloc.establishRing()
 
 	if ok, addr := alloc.space.Allocate(g.r); ok {
+		// If caller hasn't supplied a unique ID, file it under the IP address
+		// which lets the caller then release the address using DELETE /ip/address
+		if g.ident == "_" {
+			g.ident = addr.String()
+		}
 		alloc.debugln("Allocated", addr, "for", g.ident, "in", g.r)
 		alloc.addOwned(g.ident, addr)
 		g.resultChan <- allocateResult{addr, nil}

ipam/allocator.go

@@ -11,8 +11,8 @@ import (
 	"github.com/weaveworks/weave/ipam/paxos"
 	"github.com/weaveworks/weave/ipam/ring"
 	"github.com/weaveworks/weave/ipam/space"
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
 // Kinds of message we can unicast to other peers
@@ -43,37 +43,39 @@ type operation interface {
 // are used around data structures.
 type Allocator struct {
 	actionChan       chan<- func()
-	ourName          router.PeerName
+	ourName          mesh.PeerName
 	universe         address.Range                // superset of all ranges
 	ring             *ring.Ring                   // information on ranges owned by all peers
 	space            space.Space                  // more detail on ranges owned by us
 	owned            map[string][]address.Address // who owns what addresses, indexed by container-ID
-	nicknames        map[router.PeerName]string   // so we can map nicknames for rmpeer
+	nicknames        map[mesh.PeerName]string     // so we can map nicknames for rmpeer
 	pendingAllocates []operation                  // held until we get some free space
 	pendingClaims    []operation                  // held until we know who owns the space
-	gossip           router.Gossip                // our link to the outside world for sending messages
+	gossip           mesh.Gossip                  // our link to the outside world for sending messages
 	paxos            *paxos.Node
 	paxosTicker      *time.Ticker
 	shuttingDown     bool // to avoid doing any requests while trying to shut down
+	isKnownPeer      func(mesh.PeerName) bool
 	now              func() time.Time
 }
 
 // NewAllocator creates and initialises a new Allocator
-func NewAllocator(ourName router.PeerName, ourUID router.PeerUID, ourNickname string, universe address.Range, quorum uint) *Allocator {
+func NewAllocator(ourName mesh.PeerName, ourUID mesh.PeerUID, ourNickname string, universe address.Range, quorum uint, isKnownPeer func(name mesh.PeerName) bool) *Allocator {
 	return &Allocator{
-		ourName:   ourName,
-		universe:  universe,
-		ring:      ring.New(universe.Start, universe.End, ourName),
-		owned:     make(map[string][]address.Address),
-		paxos:     paxos.NewNode(ourName, ourUID, quorum),
-		nicknames: map[router.PeerName]string{ourName: ourNickname},
-		now:       time.Now,
+		ourName:     ourName,
+		universe:    universe,
+		ring:        ring.New(universe.Start, universe.End, ourName),
+		owned:       make(map[string][]address.Address),
+		paxos:       paxos.NewNode(ourName, ourUID, quorum),
+		nicknames:   map[mesh.PeerName]string{ourName: ourNickname},
+		isKnownPeer: isKnownPeer,
+		now:         time.Now,
 	}
 }
 
 // Start runs the allocator goroutine
 func (alloc *Allocator) Start() {
-	actionChan := make(chan func(), router.ChannelSize)
+	actionChan := make(chan func(), mesh.ChannelSize)
 	alloc.actionChan = actionChan
 	go alloc.actorLoop(actionChan)
 }
@@ -163,7 +165,7 @@ func (alloc *Allocator) tryPendingOps() {
 	}
 }
 
-func (alloc *Allocator) spaceRequestDenied(sender router.PeerName, r address.Range) {
+func (alloc *Allocator) spaceRequestDenied(sender mesh.PeerName, r address.Range) {
 	for i := 0; i < len(alloc.pendingClaims); {
 		claim := alloc.pendingClaims[i].(*claim)
 		if r.Contains(claim.addr) {
@@ -274,6 +276,33 @@ func (alloc *Allocator) Free(ident string, addrToFree address.Address) error {
 	return <-errChan
 }
 
+func (alloc *Allocator) pickPeerFromNicknames(isValid func(mesh.PeerName) bool) mesh.PeerName {
+	for name := range alloc.nicknames {
+		if name != alloc.ourName && isValid(name) {
+			return name
+		}
+	}
+	return mesh.UnknownPeerName
+}
+
+func (alloc *Allocator) pickPeerForTransfer() mesh.PeerName {
+	// first try alive peers that actively participate in IPAM (i.e. have entries)
+	if heir := alloc.ring.PickPeerForTransfer(alloc.isKnownPeer); heir != mesh.UnknownPeerName {
+		return heir
+	}
+	// next try alive peers that have IPAM enabled but have no entries
+	if heir := alloc.pickPeerFromNicknames(alloc.isKnownPeer); heir != mesh.UnknownPeerName {
+		return heir
+	}
+	// next try disappeared peers that still have entries
+	t := func(mesh.PeerName) bool { return true }
+	if heir := alloc.ring.PickPeerForTransfer(t); heir != mesh.UnknownPeerName {
+		return heir
+	}
+	// finally, disappeared peers that that passively participated in IPAM
+	return alloc.pickPeerFromNicknames(t)
+}
+
 // Shutdown (Sync)
 func (alloc *Allocator) Shutdown() {
 	alloc.infof("Shutdown")
@@ -282,7 +311,7 @@ func (alloc *Allocator) Shutdown() {
 		alloc.shuttingDown = true
 		alloc.cancelOps(&alloc.pendingClaims)
 		alloc.cancelOps(&alloc.pendingAllocates)
-		if heir := alloc.ring.PickPeerForTransfer(); heir != router.UnknownPeerName {
+		if heir := alloc.pickPeerForTransfer(); heir != mesh.UnknownPeerName {
 			alloc.ring.Transfer(alloc.ourName, heir)
 			alloc.space.Clear()
 			alloc.gossip.GossipBroadcast(alloc.Gossip())
@@ -310,7 +339,6 @@ func (alloc *Allocator) AdminTakeoverRanges(peerNameOrNickname string) error {
 			return
 		}
 
-		delete(alloc.nicknames, peername)
 		newRanges, err := alloc.ring.Transfer(peername, alloc.ourName)
 		alloc.space.AddRanges(newRanges)
 		resultChan <- err
@@ -322,27 +350,27 @@ func (alloc *Allocator) AdminTakeoverRanges(peerNameOrNickname string) error {
 // call into the router for this because we are interested in peers
 // that have gone away but are still in the ring, which is why we
 // maintain our own nicknames map.
-func (alloc *Allocator) lookupPeername(name string) (router.PeerName, error) {
+func (alloc *Allocator) lookupPeername(name string) (mesh.PeerName, error) {
 	for peername, nickname := range alloc.nicknames {
 		if nickname == name {
 			return peername, nil
 		}
 	}
 
-	return router.PeerNameFromString(name)
+	return mesh.PeerNameFromString(name)
 }
 
-// Restrict the peers in "nicknames" to those in the ring and our own
+// Restrict the peers in "nicknames" to those in the ring plus peers known to the router
 func (alloc *Allocator) pruneNicknames() {
 	ringPeers := alloc.ring.PeerNames()
 	for name := range alloc.nicknames {
-		if _, ok := ringPeers[name]; !ok && name != alloc.ourName {
+		if _, ok := ringPeers[name]; !ok && !alloc.isKnownPeer(name) {
 			delete(alloc.nicknames, name)
 		}
 	}
 }
 
-func (alloc *Allocator) annotatePeernames(names []router.PeerName) []string {
+func (alloc *Allocator) annotatePeernames(names []mesh.PeerName) []string {
 	var res []string
 	for _, name := range names {
 		if nickname, found := alloc.nicknames[name]; found {
@@ -360,7 +388,7 @@ func decodeRange(msg []byte) (r address.Range, err error) {
 }
 
 // OnGossipUnicast (Sync)
-func (alloc *Allocator) OnGossipUnicast(sender router.PeerName, msg []byte) error {
+func (alloc *Allocator) OnGossipUnicast(sender mesh.PeerName, msg []byte) error {
 	alloc.debugln("OnGossipUnicast from", sender, ": ", len(msg), "bytes")
 	resultChan := make(chan error)
 	alloc.actionChan <- func() {
@@ -386,7 +414,7 @@ func (alloc *Allocator) OnGossipUnicast(sender router.PeerName, msg []byte) erro
 }
 
 // OnGossipBroadcast (Sync)
-func (alloc *Allocator) OnGossipBroadcast(sender router.PeerName, msg []byte) (router.GossipData, error) {
+func (alloc *Allocator) OnGossipBroadcast(sender mesh.PeerName, msg []byte) (mesh.GossipData, error) {
 	alloc.debugln("OnGossipBroadcast from", sender, ":", len(msg), "bytes")
 	resultChan := make(chan error)
 	alloc.actionChan <- func() {
@@ -399,7 +427,7 @@ type gossipState struct {
 	// We send a timstamp along with the information to be
 	// gossipped in order to detect skewed clocks
 	Now       int64
-	Nicknames map[router.PeerName]string
+	Nicknames map[mesh.PeerName]string
 
 	Paxos paxos.GossipState
 	Ring  *ring.Ring
@@ -435,11 +463,11 @@ func (alloc *Allocator) Encode() []byte {
 }
 
 // OnGossip (Sync)
-func (alloc *Allocator) OnGossip(msg []byte) (router.GossipData, error) {
+func (alloc *Allocator) OnGossip(msg []byte) (mesh.GossipData, error) {
 	alloc.debugln("Allocator.OnGossip:", len(msg), "bytes")
 	resultChan := make(chan error)
 	alloc.actionChan <- func() {
-		resultChan <- alloc.update(router.UnknownPeerName, msg)
+		resultChan <- alloc.update(mesh.UnknownPeerName, msg)
 	}
 	return nil, <-resultChan // for now, we never propagate updates. TBD
 }
@@ -450,8 +478,8 @@ type ipamGossipData struct {
 	alloc *Allocator
 }
 
-func (d *ipamGossipData) Merge(other router.GossipData) {
-	// no-op
+func (d *ipamGossipData) Merge(other mesh.GossipData) mesh.GossipData {
+	return d // no-op
 }
 
 func (d *ipamGossipData) Encode() [][]byte {
@@ -460,12 +488,12 @@ func (d *ipamGossipData) Encode() [][]byte {
 
 // Gossip returns a GossipData implementation, which in this case always
 // returns the latest ring state (and does nothing on merge)
-func (alloc *Allocator) Gossip() router.GossipData {
+func (alloc *Allocator) Gossip() mesh.GossipData {
 	return &ipamGossipData{alloc}
 }
 
 // SetInterfaces gives the allocator two interfaces for talking to the outside world
-func (alloc *Allocator) SetInterfaces(gossip router.Gossip) {
+func (alloc *Allocator) SetInterfaces(gossip mesh.Gossip) {
 	alloc.gossip = gossip
 }
 
@@ -512,7 +540,7 @@ func (alloc *Allocator) establishRing() {
 	}
 }
 
-func (alloc *Allocator) createRing(peers []router.PeerName) {
+func (alloc *Allocator) createRing(peers []mesh.PeerName) {
 	alloc.debugln("Paxos consensus:", peers)
 	alloc.ring.ClaimForPeers(normalizeConsensus(peers))
 	alloc.gossip.GossipBroadcast(alloc.Gossip())
@@ -535,7 +563,7 @@ func (alloc *Allocator) ringUpdated() {
 }
 
 // For compatibility with sort.Interface
-type peerNames []router.PeerName
+type peerNames []mesh.PeerName
 
 func (a peerNames) Len() int           { return len(a) }
 func (a peerNames) Less(i, j int) bool { return a[i] < a[j] }
@@ -544,7 +572,7 @@ func (a peerNames) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
 // When we get a consensus from Paxos, the peer names are not in a
 // defined order and may contain duplicates.  This function sorts them
 // and de-dupes.
-func normalizeConsensus(consensus []router.PeerName) []router.PeerName {
+func normalizeConsensus(consensus []mesh.PeerName) []mesh.PeerName {
 	if len(consensus) == 0 {
 		return nil
 	}
@@ -579,22 +607,22 @@ func encodeRange(r address.Range) []byte {
 	return buf.Bytes()
 }
 
-func (alloc *Allocator) sendSpaceRequest(dest router.PeerName, r address.Range) error {
-	msg := router.Concat([]byte{msgSpaceRequest}, encodeRange(r))
+func (alloc *Allocator) sendSpaceRequest(dest mesh.PeerName, r address.Range) error {
+	msg := append([]byte{msgSpaceRequest}, encodeRange(r)...)
 	return alloc.gossip.GossipUnicast(dest, msg)
 }
 
-func (alloc *Allocator) sendSpaceRequestDenied(dest router.PeerName, r address.Range) error {
-	msg := router.Concat([]byte{msgSpaceRequestDenied}, encodeRange(r))
+func (alloc *Allocator) sendSpaceRequestDenied(dest mesh.PeerName, r address.Range) error {
+	msg := append([]byte{msgSpaceRequestDenied}, encodeRange(r)...)
 	return alloc.gossip.GossipUnicast(dest, msg)
 }
 
-func (alloc *Allocator) sendRingUpdate(dest router.PeerName) {
-	msg := router.Concat([]byte{msgRingUpdate}, alloc.encode())
+func (alloc *Allocator) sendRingUpdate(dest mesh.PeerName) {
+	msg := append([]byte{msgRingUpdate}, alloc.encode()...)
 	alloc.gossip.GossipUnicast(dest, msg)
 }
 
-func (alloc *Allocator) update(sender router.PeerName, msg []byte) error {
+func (alloc *Allocator) update(sender mesh.PeerName, msg []byte) error {
 	reader := bytes.NewReader(msg)
 	decoder := gob.NewDecoder(reader)
 	var data gossipState
@@ -646,7 +674,7 @@ func (alloc *Allocator) update(sender router.PeerName, msg []byte) error {
 					alloc.createRing(cons.Value)
 				}
 			}
-		} else if sender != router.UnknownPeerName {
+		} else if sender != mesh.UnknownPeerName {
 			// Sender is trying to initialize a ring, but we have one
 			// already - send it straight back
 			alloc.sendRingUpdate(sender)
@@ -656,7 +684,7 @@ func (alloc *Allocator) update(sender router.PeerName, msg []byte) error {
 	return nil
 }
 
-func (alloc *Allocator) donateSpace(r address.Range, to router.PeerName) {
+func (alloc *Allocator) donateSpace(r address.Range, to mesh.PeerName) {
 	// No matter what we do, we'll send a unicast gossip
 	// of our ring back to tha chap who asked for space.
 	// This serves to both tell him of any space we might

ipam/claim.go

@@ -4,8 +4,8 @@ import (
 	"fmt"
 
 	"github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
 type claim struct {
@@ -43,7 +43,7 @@ func (c *claim) Try(alloc *Allocator) bool {
 	switch owner := alloc.ring.Owner(c.addr); owner {
 	case alloc.ourName:
 		// success
-	case router.UnknownPeerName:
+	case mesh.UnknownPeerName:
 		// If our ring doesn't know, it must be empty.
 		if c.noErrorOnUnknown {
 			alloc.infof("Claim %s for %s: address allocator still initializing; will try later.", c.addr, c.ident)
@@ -86,7 +86,7 @@ func (c *claim) Try(alloc *Allocator) bool {
 	return true
 }
 
-func (c *claim) deniedBy(alloc *Allocator, owner router.PeerName) {
+func (c *claim) deniedBy(alloc *Allocator, owner mesh.PeerName) {
 	name, found := alloc.nicknames[owner]
 	if found {
 		name = " (" + name + ")"

ipam/http.go

@@ -57,6 +57,10 @@ func (alloc *Allocator) handleHTTPAllocate(dockerCli *docker.Client, w http.Resp
 
 // HandleHTTP wires up ipams HTTP endpoints to the provided mux.
 func (alloc *Allocator) HandleHTTP(router *mux.Router, defaultSubnet address.CIDR, dockerCli *docker.Client) {
+	router.Methods("GET").Path("/ipinfo/defaultsubnet").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "%s", defaultSubnet)
+	})
+
 	router.Methods("PUT").Path("/ip/{id}/{ip}").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		vars := mux.Vars(r)
 		ident := vars["id"]

ipam/http_test.go

@@ -14,7 +14,6 @@ import (
 	"github.com/stretchr/testify/require"
 	"github.com/weaveworks/weave/common"
 	"github.com/weaveworks/weave/net/address"
-	wt "github.com/weaveworks/weave/testing"
 )
 
 func HTTPPost(t *testing.T, url string) string {
@@ -145,12 +144,6 @@ func TestBadHttp(t *testing.T) {
 }
 
 func TestHTTPCancel(t *testing.T) {
-	wt.RunWithTimeout(t, 2*time.Second, func() {
-		impTestHTTPCancel(t)
-	})
-}
-
-func impTestHTTPCancel(t *testing.T) {
 	var (
 		containerID = "deadbeef"
 		testCIDR1   = "10.0.3.0/29"

ipam/paxos/paxos.go

@@ -1,7 +1,7 @@
 package paxos
 
 import (
-	"github.com/weaveworks/weave/router"
+	"github.com/weaveworks/weave/mesh"
 )
 
 // The node identifier.  The use of the UID here is important: Paxos
@@ -9,8 +9,8 @@ import (
 // node does not restart and lose its Paxos state but claim to have
 // the same ID.
 type NodeID struct {
-	Name router.PeerName
-	UID  router.PeerUID
+	Name mesh.PeerName
+	UID  mesh.PeerUID
 }
 
 // note all fields exported in structs so we can Gob them
@@ -39,7 +39,7 @@ func (a ProposalID) valid() bool {
 }
 
 // For seeding IPAM, the value we want consensus on is a set of peer names
-type Value []router.PeerName
+type Value []mesh.PeerName
 
 // An AcceptedValue is a Value plus the proposal which originated that
 // Value.  The origin is not essential, but makes comparing
@@ -72,7 +72,7 @@ type Node struct {
 	knows  GossipState
 }
 
-func NewNode(name router.PeerName, uid router.PeerUID, quorum uint) *Node {
+func NewNode(name mesh.PeerName, uid mesh.PeerUID, quorum uint) *Node {
 	return &Node{
 		id:     NodeID{name, uid},
 		quorum: quorum,
@@ -223,7 +223,7 @@ func (node *Node) Think() bool {
 // about.  This is not necessarily all peer names, but it is at least
 // a quorum, and so good enough for seeding the ring.
 func (node *Node) pickValue() Value {
-	val := make([]router.PeerName, len(node.knows))
+	val := make([]mesh.PeerName, len(node.knows))
 	i := 0
 	for id := range node.knows {
 		val[i] = id.Name

ipam/paxos/paxos_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/weaveworks/weave/router"
+	"github.com/weaveworks/weave/mesh"
 )
 
 type TestNode struct {
@@ -97,8 +97,8 @@ func makeRandomModel(params *TestParams, r *rand.Rand, t *testing.T) *Model {
 	}
 
 	for i := range m.nodes {
-		m.nodes[i].Node = NewNode(router.PeerName(i/2+1),
-			router.PeerUID(r.Int63()), m.quorum)
+		m.nodes[i].Node = NewNode(mesh.PeerName(i/2+1),
+			mesh.PeerUID(r.Int63()), m.quorum)
 		m.nodes[i].Propose()
 	}
 
@@ -172,8 +172,8 @@ func (m *Model) isolateNode(node *TestNode) {
 
 // Restart a node
 func (m *Model) restart(node *TestNode) {
-	node.Node = NewNode(router.PeerName(m.nextID),
-		router.PeerUID(m.r.Int63()), m.quorum)
+	node.Node = NewNode(mesh.PeerName(m.nextID),
+		mesh.PeerUID(m.r.Int63()), m.quorum)
 	m.nextID++
 	node.Propose()
 

ipam/ring/entry.go

@@ -4,14 +4,14 @@ import (
 	"sort"
 
 	"github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
 // Entry represents entries around the ring
 type entry struct {
 	Token   address.Address // The start of this range
-	Peer    router.PeerName // Who owns this range
+	Peer    mesh.PeerName   // Who owns this range
 	Version uint32          // Version of this range
 	Free    address.Offset  // Number of free IPs in this range
 }
@@ -21,7 +21,7 @@ func (e *entry) Equal(e2 *entry) bool {
 		e.Version == e2.Version
 }
 
-func (e *entry) update(peername router.PeerName, free address.Offset) {
+func (e *entry) update(peername mesh.PeerName, free address.Offset) {
 	e.Peer = peername
 	e.Version++
 	e.Free = free

ipam/ring/ring.go

@@ -13,16 +13,16 @@ import (
 	"time"
 
 	"github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
 // Ring represents the ring itself
 type Ring struct {
-	Start, End address.Address   // [min, max) tokens in this ring.  Due to wrapping, min == max (effectively)
-	Peer       router.PeerName   // name of peer owning this ring instance
-	Entries    entries           // list of entries sorted by token
-	Seeds      []router.PeerName // peers with which the ring was seeded
+	Start, End address.Address // [min, max) tokens in this ring.  Due to wrapping, min == max (effectively)
+	Peer       mesh.PeerName   // name of peer owning this ring instance
+	Entries    entries         // list of entries sorted by token
+	Seeds      []mesh.PeerName // peers with which the ring was seeded
 }
 
 func (r *Ring) assertInvariants() {
@@ -84,7 +84,7 @@ func (r *Ring) checkInvariants() error {
 }
 
 // New creates an empty ring belonging to peer.
-func New(start, end address.Address, peer router.PeerName) *Ring {
+func New(start, end address.Address, peer mesh.PeerName) *Ring {
 	common.Assert(start < end)
 
 	ring := &Ring{Start: start, End: end, Peer: peer, Entries: make([]*entry, 0)}
@@ -111,7 +111,7 @@ func (r *Ring) distance(start, end address.Address) address.Offset {
 // Preconditions:
 // - start < end
 // - [start, end) must be owned by the calling peer
-func (r *Ring) GrantRangeToHost(start, end address.Address, peer router.PeerName) {
+func (r *Ring) GrantRangeToHost(start, end address.Address, peer mesh.PeerName) {
 	//fmt.Printf("%s GrantRangeToHost [%v,%v) -> %s\n", r.Peer, start, end, peer)
 
 	r.assertInvariants()
@@ -210,7 +210,7 @@ func (r *Ring) Merge(gossip Ring) error {
 	addToResult := func(e entry) { result = append(result, &e) }
 
 	var mine, theirs *entry
-	var previousOwner *router.PeerName
+	var previousOwner *mesh.PeerName
 	// i is index into r.Entries; j is index into gossip.Entries
 	var i, j int
 	for i < len(r.Entries) && j < len(gossip.Entries) {
@@ -316,9 +316,28 @@ func (r *Ring) OwnedRanges() (result []address.Range) {
 	return r.splitRangesOverZero(result)
 }
 
+// For printing status
+type RangeInfo struct {
+	Peer mesh.PeerName
+	address.Range
+	Version uint32
+}
+
+func (r *Ring) AllRangeInfo() (result []RangeInfo) {
+	for i, entry := range r.Entries {
+		nextEntry := r.Entries.entry(i + 1)
+		ranges := []address.Range{{Start: entry.Token, End: nextEntry.Token}}
+		ranges = r.splitRangesOverZero(ranges)
+		for _, r := range ranges {
+			result = append(result, RangeInfo{entry.Peer, r, entry.Version})
+		}
+	}
+	return
+}
+
 // ClaimForPeers claims the entire ring for the array of peers passed
 // in.  Only works for empty rings.
-func (r *Ring) ClaimForPeers(peers []router.PeerName) {
+func (r *Ring) ClaimForPeers(peers []mesh.PeerName) {
 	common.Assert(r.Empty())
 	defer r.assertInvariants()
 	defer r.updateExportedVariables()
@@ -350,7 +369,7 @@ func (r *Ring) ClaimForPeers(peers []router.PeerName) {
 	r.Seeds = peers
 }
 
-func (r *Ring) FprintWithNicknames(w io.Writer, m map[router.PeerName]string) {
+func (r *Ring) FprintWithNicknames(w io.Writer, m map[mesh.PeerName]string) {
 	for _, entry := range r.Entries {
 		nickname, found := m[entry.Peer]
 		if found {
@@ -365,7 +384,7 @@ func (r *Ring) FprintWithNicknames(w io.Writer, m map[router.PeerName]string) {
 func (r *Ring) String() string {
 	var buffer bytes.Buffer
 	fmt.Fprintf(&buffer, "Ring [%s, %s)", r.Start, r.End)
-	r.FprintWithNicknames(&buffer, make(map[router.PeerName]string))
+	r.FprintWithNicknames(&buffer, make(map[mesh.PeerName]string))
 	return buffer.String()
 }
 
@@ -415,7 +434,7 @@ func (r *Ring) ReportFree(freespace map[address.Address]address.Offset) {
 
 type weightedPeer struct {
 	weight   float64
-	peername router.PeerName
+	peername mesh.PeerName
 }
 type weightedPeers []weightedPeer
 
@@ -426,10 +445,10 @@ func (ws weightedPeers) Swap(i, j int)      { ws[i], ws[j] = ws[j], ws[i] }
 
 // ChoosePeersToAskForSpace returns all peers we can ask for space in
 // the range [start, end), in weighted-random order.  Assumes start<end.
-func (r *Ring) ChoosePeersToAskForSpace(start, end address.Address) []router.PeerName {
+func (r *Ring) ChoosePeersToAskForSpace(start, end address.Address) []mesh.PeerName {
 	var (
 		sum               address.Offset
-		totalSpacePerPeer = make(map[router.PeerName]address.Offset) // Compute total free space per peer
+		totalSpacePerPeer = make(map[mesh.PeerName]address.Offset) // Compute total free space per peer
 	)
 
 	// iterate through tokens
@@ -463,25 +482,25 @@ func (r *Ring) ChoosePeersToAskForSpace(start, end address.Address) []router.Pee
 		ws = append(ws, weightedPeer{weight: float64(space) * rand.Float64(), peername: peername})
 	}
 	sort.Sort(ws)
-	result := make([]router.PeerName, len(ws))
+	result := make([]mesh.PeerName, len(ws))
 	for i, wp := range ws {
 		result[i] = wp.peername
 	}
 	return result
 }
 
-func (r *Ring) PickPeerForTransfer() router.PeerName {
+func (r *Ring) PickPeerForTransfer(isValid func(mesh.PeerName) bool) mesh.PeerName {
 	for _, entry := range r.Entries {
-		if entry.Peer != r.Peer {
+		if entry.Peer != r.Peer && isValid(entry.Peer) {
 			return entry.Peer
 		}
 	}
-	return router.UnknownPeerName
+	return mesh.UnknownPeerName
 }
 
 // Transfer will mark all entries associated with 'from' peer as owned by 'to' peer
 // and return ranges indicating the new space we picked up
-func (r *Ring) Transfer(from, to router.PeerName) ([]address.Range, error) {
+func (r *Ring) Transfer(from, to mesh.PeerName) ([]address.Range, error) {
 	r.assertInvariants()
 	defer r.assertInvariants()
 	defer r.updateExportedVariables()
@@ -511,13 +530,13 @@ func (r *Ring) Contains(addr address.Address) bool {
 }
 
 // Owner returns the peername which owns the range containing addr
-func (r *Ring) Owner(token address.Address) router.PeerName {
+func (r *Ring) Owner(token address.Address) mesh.PeerName {
 	common.Assert(r.Start <= token && token < r.End)
 
 	r.assertInvariants()
 	// There can be no owners on an empty ring
 	if r.Empty() {
-		return router.UnknownPeerName
+		return mesh.UnknownPeerName
 	}
 
 	// Look for the right-most entry, less than or equal to token
@@ -530,8 +549,8 @@ func (r *Ring) Owner(token address.Address) router.PeerName {
 }
 
 // Get the set of PeerNames mentioned in the ring
-func (r *Ring) PeerNames() map[router.PeerName]struct{} {
-	res := make(map[router.PeerName]struct{})
+func (r *Ring) PeerNames() map[mesh.PeerName]struct{} {
+	res := make(map[mesh.PeerName]struct{})
 
 	for _, entry := range r.Entries {
 		res[entry.Peer] = struct{}{}

ipam/ring/ring_test.go

@@ -9,14 +9,14 @@ import (
 
 	"github.com/stretchr/testify/require"
 	"github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
 var (
-	peer1name, _ = router.PeerNameFromString("01:00:00:00:02:00")
-	peer2name, _ = router.PeerNameFromString("02:00:00:00:02:00")
-	peer3name, _ = router.PeerNameFromString("03:00:00:00:02:00")
+	peer1name, _ = mesh.PeerNameFromString("01:00:00:00:02:00")
+	peer2name, _ = mesh.PeerNameFromString("02:00:00:00:02:00")
+	peer3name, _ = mesh.PeerNameFromString("03:00:00:00:02:00")
 
 	start, end    = ParseIP("10.0.0.0"), ParseIP("10.0.0.255")
 	dot10, dot245 = ParseIP("10.0.0.10"), ParseIP("10.0.0.245")
@@ -351,7 +351,7 @@ func TestGossip(t *testing.T) {
 	assertRing(ring2, []*entry{{Token: start, Peer: peer1name, Free: 255}})
 }
 
-func assertPeersWithSpace(t *testing.T, ring *Ring, start, end address.Address, expected int) []router.PeerName {
+func assertPeersWithSpace(t *testing.T, ring *Ring, start, end address.Address, expected int) []mesh.PeerName {
 	peers := ring.ChoosePeersToAskForSpace(start, end)
 	require.Equal(t, expected, len(peers))
 	return peers
@@ -375,7 +375,7 @@ func TestFindFree(t *testing.T) {
 	ring1.assertInvariants()
 
 	// We should return others
-	var peers []router.PeerName
+	var peers []mesh.PeerName
 
 	ring1.Entries = []*entry{{Token: start, Peer: peer2name, Free: 1}}
 	peers = assertPeersWithSpace(t, ring1, start, end, 1)
@@ -493,7 +493,7 @@ func TestOwner(t *testing.T) {
 	require.True(t, ring1.Contains(start), "start should be in ring")
 	require.False(t, ring1.Contains(end), "end should not be in ring")
 
-	require.Equal(t, router.UnknownPeerName, ring1.Owner(start))
+	require.Equal(t, mesh.UnknownPeerName, ring1.Owner(start))
 
 	ring1.ClaimItAll()
 	ring1.GrantRangeToHost(middle, end, peer2name)
@@ -517,9 +517,9 @@ func TestFuzzRing(t *testing.T) {
 		iterations = 1000
 	)
 
-	peers := make([]router.PeerName, numPeers)
+	peers := make([]mesh.PeerName, numPeers)
 	for i := 0; i < numPeers; i++ {
-		peer, _ := router.PeerNameFromString(fmt.Sprintf("%02d:00:00:00:02:00", i))
+		peer, _ := mesh.PeerNameFromString(fmt.Sprintf("%02d:00:00:00:02:00", i))
 		peers[i] = peer
 	}
 
@@ -601,13 +601,13 @@ func TestFuzzRingHard(t *testing.T) {
 	var (
 		numPeers   = 100
 		iterations = 3000
-		peers      []router.PeerName
+		peers      []mesh.PeerName
 		rings      []*Ring
 		nextPeerID = 0
 	)
 
 	addPeer := func() {
-		peer, _ := router.PeerNameFromString(fmt.Sprintf("%02d:%02d:00:00:00:00", nextPeerID/10, nextPeerID%10))
+		peer, _ := mesh.PeerNameFromString(fmt.Sprintf("%02d:%02d:00:00:00:00", nextPeerID/10, nextPeerID%10))
 		common.Log.Debugf("%s: Adding peer", peer)
 		nextPeerID++
 		peers = append(peers, peer)
@@ -620,7 +620,7 @@ func TestFuzzRingHard(t *testing.T) {
 
 	rings[0].ClaimItAll()
 
-	randomPeer := func(exclude int) (int, router.PeerName, *Ring) {
+	randomPeer := func(exclude int) (int, mesh.PeerName, *Ring) {
 		var peerIndex int
 		if exclude >= 0 {
 			peerIndex = rand.Intn(len(peers) - 1)
@@ -729,7 +729,7 @@ func TestFuzzRingHard(t *testing.T) {
 }
 
 func (r *Ring) ClaimItAll() {
-	r.ClaimForPeers([]router.PeerName{r.Peer})
+	r.ClaimForPeers([]mesh.PeerName{r.Peer})
 }
 
 func (es entries) String() string {

ipam/status.go

@@ -1,6 +1,7 @@
 package ipam
 
 import (
+	"fmt"
 	"github.com/weaveworks/weave/ipam/paxos"
 	"github.com/weaveworks/weave/net/address"
 )
@@ -8,6 +9,7 @@ import (
 type Status struct {
 	Paxos            *paxos.Status
 	Range            string
+	RangeNumIPs      int
 	DefaultSubnet    string
 	Entries          []EntryStatus
 	PendingClaims    []ClaimStatus
@@ -15,9 +17,12 @@ type Status struct {
 }
 
 type EntryStatus struct {
-	Token   string
-	Peer    string
-	Version uint32
+	Token       string
+	Size        uint32
+	Peer        string
+	Nickname    string
+	IsKnownPeer bool
+	Version     uint32
 }
 
 type ClaimStatus struct {
@@ -40,6 +45,7 @@ func NewStatus(allocator *Allocator, defaultSubnet address.CIDR) *Status {
 		resultChan <- &Status{
 			paxosStatus,
 			allocator.universe.String(),
+			int(allocator.universe.Size()),
 			defaultSubnet.String(),
 			newEntryStatusSlice(allocator),
 			newClaimStatusSlice(allocator),
@@ -56,8 +62,15 @@ func newEntryStatusSlice(allocator *Allocator) []EntryStatus {
 		return slice
 	}
 
-	for _, entry := range allocator.ring.Entries {
-		slice = append(slice, EntryStatus{entry.Token.String(), entry.Peer.String(), entry.Version})
+	for _, r := range allocator.ring.AllRangeInfo() {
+		slice = append(slice, EntryStatus{
+			Token:       r.Start.String(),
+			Size:        uint32(r.Size()),
+			Peer:        r.Peer.String(),
+			Nickname:    allocator.nicknames[r.Peer],
+			IsKnownPeer: allocator.isKnownPeer(r.Peer),
+			Version:     r.Version,
+		})
 	}
 
 	return slice
@@ -76,7 +89,7 @@ func newAllocateIdentSlice(allocator *Allocator) []string {
 	var slice []string
 	for _, op := range allocator.pendingAllocates {
 		allocate := op.(*allocate)
-		slice = append(slice, allocate.ident)
+		slice = append(slice, fmt.Sprintf("%s %s", allocate.ident, allocate.r.String()))
 	}
 	return slice
 }

ipam/testutils_test.go

@@ -8,13 +8,13 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/require"
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 	"github.com/weaveworks/weave/testing/gossip"
 )
 
 type mockMessage struct {
-	dst     router.PeerName
+	dst     mesh.PeerName
 	msgType byte
 	buf     []byte
 }
@@ -48,13 +48,13 @@ func (m *mockGossipComms) String() string {
 // that the contents of messages are never re-ordered.  Which, for instance,
 // requires they are not based off iterating through a map.
 
-func (m *mockGossipComms) GossipBroadcast(update router.GossipData) error {
+func (m *mockGossipComms) GossipBroadcast(update mesh.GossipData) error {
 	m.Lock()
 	defer m.Unlock()
 	buf := []byte{}
 	if len(m.messages) == 0 {
 		require.FailNow(m, fmt.Sprintf("%s: Gossip broadcast message unexpected: \n%x", m.name, buf))
-	} else if msg := m.messages[0]; msg.dst != router.UnknownPeerName {
+	} else if msg := m.messages[0]; msg.dst != mesh.UnknownPeerName {
 		require.FailNow(m, fmt.Sprintf("%s: Expected Gossip message to %s but got broadcast", m.name, msg.dst))
 	} else if msg.buf != nil && !equalByteBuffer(msg.buf, buf) {
 		require.FailNow(m, fmt.Sprintf("%s: Gossip message not sent as expected: \nwant: %x\ngot : %x", m.name, msg.buf, buf))
@@ -77,12 +77,12 @@ func equalByteBuffer(a, b []byte) bool {
 	return true
 }
 
-func (m *mockGossipComms) GossipUnicast(dstPeerName router.PeerName, buf []byte) error {
+func (m *mockGossipComms) GossipUnicast(dstPeerName mesh.PeerName, buf []byte) error {
 	m.Lock()
 	defer m.Unlock()
 	if len(m.messages) == 0 {
 		require.FailNow(m, fmt.Sprintf("%s: Gossip message to %s unexpected: \n%s", m.name, dstPeerName, buf))
-	} else if msg := m.messages[0]; msg.dst == router.UnknownPeerName {
+	} else if msg := m.messages[0]; msg.dst == mesh.UnknownPeerName {
 		require.FailNow(m, fmt.Sprintf("%s: Expected Gossip broadcast message but got dest %s", m.name, dstPeerName))
 	} else if msg.dst != dstPeerName {
 		require.FailNow(m, fmt.Sprintf("%s: Expected Gossip message to %s but got dest %s", m.name, msg.dst, dstPeerName))
@@ -99,7 +99,7 @@ func (m *mockGossipComms) GossipUnicast(dstPeerName router.PeerName, buf []byte)
 
 func ExpectMessage(alloc *Allocator, dst string, msgType byte, buf []byte) {
 	m := alloc.gossip.(*mockGossipComms)
-	dstPeerName, _ := router.PeerNameFromString(dst)
+	dstPeerName, _ := mesh.PeerNameFromString(dst)
 	m.Lock()
 	m.messages = append(m.messages, mockMessage{dstPeerName, msgType, buf})
 	m.Unlock()
@@ -108,7 +108,7 @@ func ExpectMessage(alloc *Allocator, dst string, msgType byte, buf []byte) {
 func ExpectBroadcastMessage(alloc *Allocator, buf []byte) {
 	m := alloc.gossip.(*mockGossipComms)
 	m.Lock()
-	m.messages = append(m.messages, mockMessage{router.UnknownPeerName, 0, buf})
+	m.messages = append(m.messages, mockMessage{mesh.UnknownPeerName, 0, buf})
 	m.Unlock()
 }
 
@@ -124,7 +124,7 @@ func CheckAllExpectedMessagesSent(allocs ...*Allocator) {
 }
 
 func makeAllocator(name string, cidrStr string, quorum uint) (*Allocator, address.Range) {
-	peername, err := router.PeerNameFromString(name)
+	peername, err := mesh.PeerNameFromString(name)
 	if err != nil {
 		panic(err)
 	}
@@ -134,8 +134,8 @@ func makeAllocator(name string, cidrStr string, quorum uint) (*Allocator, addres
 		panic(err)
 	}
 
-	alloc := NewAllocator(peername, router.PeerUID(rand.Int63()),
-		"nick-"+name, cidr.Range(), quorum)
+	alloc := NewAllocator(peername, mesh.PeerUID(rand.Int63()),
+		"nick-"+name, cidr.Range(), quorum, func(mesh.PeerName) bool { return true })
 
 	return alloc, cidr.HostRange()
 }
@@ -149,7 +149,7 @@ func makeAllocatorWithMockGossip(t *testing.T, name string, universeCIDR string,
 }
 
 func (alloc *Allocator) claimRingForTesting(allocs ...*Allocator) {
-	peers := []router.PeerName{alloc.ourName}
+	peers := []mesh.PeerName{alloc.ourName}
 	for _, alloc2 := range allocs {
 		peers = append(peers, alloc2.ourName)
 	}

mesh/connection.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"fmt"
@@ -40,17 +40,19 @@ type RemoteConnection struct {
 type LocalConnection struct {
 	sync.RWMutex
 	RemoteConnection
-	TCPConn       *net.TCPConn
-	version       byte
-	tcpSender     TCPSender
-	remoteUDPAddr *net.UDPAddr
-	SessionKey    *[32]byte
-	heartbeatTCP  *time.Ticker
-	Router        *Router
-	uid           uint64
-	actionChan    chan<- ConnectionAction
-	finished      <-chan struct{} // closed to signal that actorLoop has finished
-	forwarder     OverlayForwarder
+	TCPConn         *net.TCPConn
+	TrustRemote     bool // is remote on a trusted subnet?
+	TrustedByRemote bool // does remote trust us?
+	version         byte
+	tcpSender       TCPSender
+	SessionKey      *[32]byte
+	heartbeatTCP    *time.Ticker
+	Router          *Router
+	uid             uint64
+	actionChan      chan<- ConnectionAction
+	errorChan       chan<- error
+	finished        <-chan struct{} // closed to signal that actorLoop has finished
+	OverlayConn     OverlayConnection
 }
 
 type ConnectionAction func() error
@@ -83,22 +85,23 @@ func (conn *RemoteConnection) ErrorLog(args ...interface{}) {
 
 // Does not return anything. If the connection is successful, it will
 // end up in the local peer's connections map.
-func StartLocalConnection(connRemote *RemoteConnection, tcpConn *net.TCPConn, udpAddr *net.UDPAddr, router *Router, acceptNewPeer bool) {
+func StartLocalConnection(connRemote *RemoteConnection, tcpConn *net.TCPConn, router *Router, acceptNewPeer bool) {
 	if connRemote.local != router.Ourself.Peer {
 		log.Fatal("Attempt to create local connection from a peer which is not ourself")
 	}
-	// NB, we're taking a copy of connRemote here.
 	actionChan := make(chan ConnectionAction, ChannelSize)
+	errorChan := make(chan error, 1)
 	finished := make(chan struct{})
 	conn := &LocalConnection{
-		RemoteConnection: *connRemote,
+		RemoteConnection: *connRemote, // NB, we're taking a copy of connRemote here.
 		Router:           router,
 		TCPConn:          tcpConn,
-		remoteUDPAddr:    udpAddr,
+		TrustRemote:      router.Trusts(connRemote),
 		uid:              randUint64(),
 		actionChan:       actionChan,
+		errorChan:        errorChan,
 		finished:         finished}
-	go conn.run(actionChan, finished, acceptNewPeer)
+	go conn.run(actionChan, errorChan, finished, acceptNewPeer)
 }
 
 func (conn *LocalConnection) BreakTie(dupConn Connection) ConnectionTieBreak {
@@ -118,11 +121,6 @@ func (conn *LocalConnection) Established() bool {
 	return conn.established
 }
 
-// Send directly, not via the Actor.  If it goes via the Actor we can
-// get a deadlock where LocalConnection is blocked talking to
-// LocalPeer and LocalPeer is blocked trying send a ProtocolMsg via
-// LocalConnection, and the channels are full in both directions so
-// nothing can proceed.
 func (conn *LocalConnection) SendProtocolMsg(m ProtocolMsg) {
 	if err := conn.sendProtocolMsg(m); err != nil {
 		conn.Shutdown(err)
@@ -136,15 +134,17 @@ func (conn *LocalConnection) SendProtocolMsg(m ProtocolMsg) {
 // do not need locks for reading, and only need write locks for fields
 // read by other processes.
 
-// Async
+// Non-blocking.
 func (conn *LocalConnection) Shutdown(err error) {
 	// err should always be a real error, even if only io.EOF
 	if err == nil {
 		panic("nil error")
 	}
 
-	// Run on its own goroutine in case the channel is backed up
-	go func() { conn.sendAction(func() error { return err }) }()
+	select {
+	case conn.errorChan <- err:
+	default:
+	}
 }
 
 // Send an actor request to the actorLoop, but don't block if
@@ -159,7 +159,7 @@ func (conn *LocalConnection) sendAction(action ConnectionAction) {
 
 // ACTOR server
 
-func (conn *LocalConnection) run(actionChan <-chan ConnectionAction, finished chan<- struct{}, acceptNewPeer bool) {
+func (conn *LocalConnection) run(actionChan <-chan ConnectionAction, errorChan <-chan error, finished chan<- struct{}, acceptNewPeer bool) {
 	var err error // important to use this var and not create another one with 'err :='
 	defer func() { conn.shutdown(err) }()
 	defer close(finished)
@@ -192,37 +192,43 @@ func (conn *LocalConnection) run(actionChan <-chan ConnectionAction, finished ch
 
 	conn.Log("connection ready; using protocol version", conn.version)
 
-	params := ForwarderParams{
+	// only use negotiated session key for untrusted connections
+	var sessionKey *[32]byte
+	if conn.Untrusted() {
+		sessionKey = conn.SessionKey
+	}
+
+	params := OverlayConnectionParams{
 		RemotePeer:         conn.remote,
-		LocalIP:            conn.TCPConn.LocalAddr().(*net.TCPAddr).IP,
-		RemoteAddr:         conn.remoteUDPAddr,
+		LocalAddr:          conn.TCPConn.LocalAddr().(*net.TCPAddr),
+		RemoteAddr:         conn.TCPConn.RemoteAddr().(*net.TCPAddr),
+		Outbound:           conn.outbound,
 		ConnUID:            conn.uid,
-		Crypto:             conn.forwarderCrypto(),
+		SessionKey:         sessionKey,
 		SendControlMessage: conn.sendOverlayControlMessage,
 		Features:           intro.Features,
 	}
-	if conn.forwarder, err = conn.Router.Overlay.MakeForwarder(params); err != nil {
+	if conn.OverlayConn, err = conn.Router.Overlay.PrepareConnection(params); err != nil {
 		return
 	}
 
 	// As soon as we do AddConnection, the new connection becomes
 	// visible to the packet routing logic.  So AddConnection must
-	// come after MakeForwarder
+	// come after PrepareConnection
 	if err = conn.Router.Ourself.AddConnection(conn); err != nil {
 		return
 	}
 	conn.Router.ConnectionMaker.ConnectionCreated(conn)
 
-	// Forwarder confirmation comes after AddConnection, because
-	// only after that completes do we know the connection is
-	// valid: in particular that it is not a duplicate connection
-	// to the same peer. Sending heartbeats on a duplicate
-	// connection can trip up crypto at the other end, since the
-	// associated UDP packets may get decoded by the other
-	// connection. It is also generally wasteful to engage in any
-	// interaction with the remote on a connection that turns out
-	// to be invalid.
-	conn.forwarder.Confirm()
+	// OverlayConnection confirmation comes after AddConnection,
+	// because only after that completes do we know the connection is
+	// valid: in particular that it is not a duplicate connection to
+	// the same peer. Overlay communication on a duplicate connection
+	// can cause problems such as tripping up overlay crypto at the
+	// other end due to data being decoded by the other connection. It
+	// is also generally wasteful to engage in any interaction with
+	// the remote on a connection that turns out to be invalid.
+	conn.OverlayConn.Confirm()
 
 	// receiveTCP must follow also AddConnection. In the absence
 	// of any indirect connectivity to the remote peer, the first
@@ -245,7 +251,7 @@ func (conn *LocalConnection) run(actionChan <-chan ConnectionAction, finished ch
 	// running AddConnection in a separate goroutine, at least not
 	// without some synchronisation. Which in turn requires the
 	// launching of the receiveTCP goroutine to precede actorLoop.
-	err = conn.actorLoop(actionChan)
+	err = conn.actorLoop(actionChan, errorChan)
 }
 
 func (conn *LocalConnection) makeFeatures() map[string]string {
@@ -256,6 +262,7 @@ func (conn *LocalConnection) makeFeatures() map[string]string {
 		"ShortID":         fmt.Sprint(conn.local.ShortID),
 		"UID":             fmt.Sprint(conn.local.UID),
 		"ConnID":          fmt.Sprint(conn.uid),
+		"Trusted":         fmt.Sprint(conn.TrustRemote),
 	}
 	conn.Router.Overlay.AddFeaturesTo(features)
 	return features
@@ -297,13 +304,21 @@ func (conn *LocalConnection) parseFeatures(features features) (*Peer, error) {
 	var hasShortID bool
 	if shortIDStr, present := features["ShortID"]; present {
 		hasShortID = true
-		shortID, err = strconv.ParseUint(shortIDStr, 10,
-			PeerShortIDBits)
+		shortID, err = strconv.ParseUint(shortIDStr, 10, PeerShortIDBits)
 		if err != nil {
 			return nil, err
 		}
 	}
 
+	var trusted bool
+	if trustedStr, present := features["Trusted"]; present {
+		trusted, err = strconv.ParseBool(trustedStr)
+		if err != nil {
+			return nil, err
+		}
+	}
+	conn.TrustedByRemote = trusted
+
 	uid, err := ParsePeerUID(features.Get("UID"))
 	if err != nil {
 		return nil, err
@@ -330,10 +345,6 @@ func (conn *LocalConnection) registerRemote(remote *Peer, acceptNewPeer bool) er
 		}
 	}
 
-	if conn.remote.UID != remote.UID {
-		return fmt.Errorf("Connection appears to be with different version of a peer we already know of")
-	}
-
 	if conn.remote == conn.local {
 		return ErrConnectToSelf
 	}
@@ -341,15 +352,17 @@ func (conn *LocalConnection) registerRemote(remote *Peer, acceptNewPeer bool) er
 	return nil
 }
 
-func (conn *LocalConnection) actorLoop(actionChan <-chan ConnectionAction) (err error) {
-	fwdErrorChan := conn.forwarder.ErrorChannel()
-	fwdEstablishedChan := conn.forwarder.EstablishedChannel()
+func (conn *LocalConnection) actorLoop(actionChan <-chan ConnectionAction, errorChan <-chan error) (err error) {
+	fwdErrorChan := conn.OverlayConn.ErrorChannel()
+	fwdEstablishedChan := conn.OverlayConn.EstablishedChannel()
 
 	for err == nil {
 		select {
 		case action := <-actionChan:
 			err = action()
 
+		case err = <-errorChan:
+
 		case <-conn.heartbeatTCP.C:
 			err = conn.sendSimpleProtocolMsg(ProtocolHeartbeat)
 
@@ -380,28 +393,17 @@ func (conn *LocalConnection) shutdown(err error) {
 		conn.Router.Ourself.DeleteConnection(conn)
 	}
 
-	stopTicker(conn.heartbeatTCP)
+	if conn.heartbeatTCP != nil {
+		conn.heartbeatTCP.Stop()
+	}
 
-	if conn.forwarder != nil {
-		conn.forwarder.Stop()
+	if conn.OverlayConn != nil {
+		conn.OverlayConn.Stop()
 	}
 
 	conn.Router.ConnectionMaker.ConnectionTerminated(conn, err)
 }
 
-func (conn *LocalConnection) forwarderCrypto() *OverlayCrypto {
-	if !conn.Router.UsingPassword() {
-		return nil
-	}
-
-	name := conn.local.NameByte
-	return &OverlayCrypto{
-		Dec:   NewNaClDecryptor(conn.SessionKey, conn.outbound),
-		Enc:   NewNaClEncryptor(name, conn.SessionKey, conn.outbound, false),
-		EncDF: NewNaClEncryptor(name, conn.SessionKey, conn.outbound, true),
-	}
-}
-
 func (conn *LocalConnection) sendOverlayControlMessage(tag byte, msg []byte) error {
 	return conn.sendProtocolMsg(ProtocolMsg{ProtocolTag(tag), msg})
 }
@@ -413,7 +415,7 @@ func (conn *LocalConnection) sendSimpleProtocolMsg(tag ProtocolTag) error {
 }
 
 func (conn *LocalConnection) sendProtocolMsg(m ProtocolMsg) error {
-	return conn.tcpSender.Send(Concat([]byte{byte(m.tag)}, m.msg))
+	return conn.tcpSender.Send(append([]byte{byte(m.tag)}, m.msg...))
 }
 
 func (conn *LocalConnection) receiveTCP(receiver TCPReceiver) {
@@ -439,8 +441,8 @@ func (conn *LocalConnection) receiveTCP(receiver TCPReceiver) {
 func (conn *LocalConnection) handleProtocolMsg(tag ProtocolTag, payload []byte) error {
 	switch tag {
 	case ProtocolHeartbeat:
-	case ProtocolConnectionEstablished, ProtocolFragmentationReceived, ProtocolPMTUVerified, ProtocolOverlayControlMsg:
-		conn.forwarder.ControlMessage(byte(tag), payload)
+	case ProtocolReserved1, ProtocolReserved2, ProtocolReserved3, ProtocolOverlayControlMsg:
+		conn.OverlayConn.ControlMessage(byte(tag), payload)
 	case ProtocolGossipUnicast, ProtocolGossipBroadcast, ProtocolGossip:
 		return conn.Router.handleGossip(tag, payload)
 	default:
@@ -453,19 +455,6 @@ func (conn *LocalConnection) extendReadDeadline() {
 	conn.TCPConn.SetReadDeadline(time.Now().Add(TCPHeartbeat * 2))
 }
 
-func (conn *LocalConnection) Forward(key ForwardPacketKey) FlowOp {
-	return conn.forwarder.Forward(key)
-}
-
-func tickerChan(ticker *time.Ticker) <-chan time.Time {
-	if ticker != nil {
-		return ticker.C
-	}
-	return nil
-}
-
-func stopTicker(ticker *time.Ticker) {
-	if ticker != nil {
-		ticker.Stop()
-	}
+func (conn *LocalConnection) Untrusted() bool {
+	return !conn.TrustRemote || !conn.TrustedByRemote
 }

mesh/connection_maker.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"fmt"
@@ -81,7 +81,7 @@ func (cm *ConnectionMaker) InitiateConnections(peers []string, replace bool) []e
 		for peer, addr := range addrs {
 			cm.directPeers[peer] = addr
 			// curtail any existing reconnect interval
-			if target, found := cm.targets[addr.String()]; found {
+			if target, found := cm.targets[cm.completeAddr(*addr)]; found {
 				target.nextTryNow()
 			}
 		}
@@ -159,6 +159,13 @@ func (cm *ConnectionMaker) queryLoop(actionChan <-chan ConnectionMakerAction) {
 	}
 }
 
+func (cm *ConnectionMaker) completeAddr(addr net.TCPAddr) string {
+	if addr.Port == 0 {
+		addr.Port = cm.port
+	}
+	return addr.String()
+}
+
 func (cm *ConnectionMaker) checkStateAndAttemptConnections() time.Duration {
 	var (
 		validTarget  = make(map[string]struct{})
@@ -181,18 +188,16 @@ func (cm *ConnectionMaker) checkStateAndAttemptConnections() time.Duration {
 
 	// Add direct targets that are not connected
 	for _, addr := range cm.directPeers {
-		completeAddr := *addr
 		attempt := true
-		if completeAddr.Port == 0 {
-			completeAddr.Port = cm.port
+		if addr.Port == 0 {
 			// If a peer was specified w/o a port, then we do not
 			// attempt to connect to it if we have any inbound
 			// connections from that IP.
-			if _, connected := ourInboundIPs[completeAddr.IP.String()]; connected {
+			if _, connected := ourInboundIPs[addr.IP.String()]; connected {
 				attempt = false
 			}
 		}
-		address := completeAddr.String()
+		address := cm.completeAddr(*addr)
 		directTarget[address] = void
 		if attempt {
 			addTarget(address)

mesh/gossip.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"fmt"
@@ -6,7 +6,7 @@ import (
 
 type GossipData interface {
 	Encode() [][]byte
-	Merge(GossipData)
+	Merge(GossipData) GossipData
 }
 
 type Gossip interface {
@@ -79,8 +79,7 @@ func (sender *GossipSender) Send(data GossipData) {
 	// NB: this must not be invoked concurrently
 	select {
 	case pending := <-sender.cell:
-		pending.Merge(data)
-		sender.cell <- pending
+		sender.cell <- pending.Merge(data)
 	default:
 		sender.cell <- data
 	}
@@ -142,7 +141,7 @@ func (router *Router) SendAllGossip() {
 func (router *Router) SendAllGossipDown(conn Connection) {
 	for channel := range router.gossipChannelSet() {
 		if gossip := channel.gossiper.Gossip(); gossip != nil {
-			channel.SendDown(conn, channel.gossiper.Gossip())
+			channel.SendDown(conn, gossip)
 		}
 	}
 }

mesh/gossip_channel.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"bytes"
@@ -97,78 +97,6 @@ func (c *GossipChannel) deliver(srcName PeerName, _ []byte, dec *gob.Decoder) er
 	return nil
 }
 
-func (c *GossipChannel) Send(srcName PeerName, data GossipData) {
-	// do this outside the lock below so we avoid lock nesting
-	c.routes.EnsureRecalculated()
-	selectedConnections := make(ConnectionSet)
-	for name := range c.routes.RandomNeighbours(srcName) {
-		if conn, found := c.ourself.ConnectionTo(name); found {
-			selectedConnections[conn] = void
-		}
-	}
-	if len(selectedConnections) == 0 {
-		return
-	}
-	connections := c.ourself.Connections()
-	c.Lock()
-	defer c.Unlock()
-	c.gcSenders(connections)
-	for conn := range selectedConnections {
-		c.sendDown(conn, data)
-	}
-}
-
-func (c *GossipChannel) SendDown(conn Connection, data GossipData) {
-	connections := c.ourself.Connections()
-	c.Lock()
-	defer c.Unlock()
-	c.gcSenders(connections)
-	c.sendDown(conn, data)
-}
-
-// GC - randomly (courtesy of go's map iterator) pick some existing
-// senders and stop&remove them if the associated connection is no
-// longer active.  We stop as soon as we encounter a valid entry; the
-// idea being that when there is little or no garbage then this
-// executes close to O(1)[1], whereas when there is lots of garbage we
-// remove it quickly.
-//
-// [1] TODO Unfortunately, due to the desire to avoid nested locks,
-// instead of simply invoking LocalPeer.ConnectionTo(name), we pass in
-// the result of LocalPeer.Connections(). That is O(n_our_connections)
-// at best.
-func (c *GossipChannel) gcSenders(connections ConnectionSet) {
-	for conn, sender := range c.senders {
-		if _, found := connections[conn]; !found {
-			delete(c.senders, conn)
-			sender.Stop()
-		} else {
-			break
-		}
-	}
-}
-
-// We have seen a couple of failures which suggest a >128GB slice was encountered.
-// 100MB should be enough for anyone.
-const maxFeasibleMessageLen = 100 * 1024 * 1024
-
-func (c *GossipChannel) sendDown(conn Connection, data GossipData) {
-	sender, found := c.senders[conn]
-	if !found {
-		sender = NewGossipSender(func(pending GossipData) {
-			for _, msg := range pending.Encode() {
-				if len(msg) > maxFeasibleMessageLen {
-					panic(fmt.Sprintf("Gossip message too large: len=%d bytes; on channel '%s' from %+v", len(msg), c.name, pending))
-				}
-				protocolMsg := ProtocolMsg{ProtocolGossip, GobEncode(c.name, c.ourself.Name, msg)}
-				conn.(ProtocolSender).SendProtocolMsg(protocolMsg)
-			}
-		})
-		c.senders[conn] = sender
-	}
-	sender.Send(data)
-}
-
 func (c *GossipChannel) GossipUnicast(dstPeerName PeerName, msg []byte) error {
 	return c.relayUnicast(dstPeerName, GobEncode(c.name, c.ourself.Name, dstPeerName, msg))
 }
@@ -236,6 +164,81 @@ func (c *GossipChannel) sendBroadcast(srcName PeerName, update GossipData) {
 	}
 }
 
+func (c *GossipChannel) Send(srcName PeerName, data GossipData) {
+	c.routes.EnsureRecalculated()
+	destinations := c.routes.RandomNeighbours(srcName)
+	if len(destinations) == 0 {
+		return
+	}
+	c.sendDown(c.ourself.ConnectionsTo(destinations), data)
+}
+
+func (c *GossipChannel) SendDown(conn Connection, data GossipData) {
+	c.sendDown([]Connection{conn}, data)
+}
+
+func (c *GossipChannel) sendDown(selectedConnections []Connection, data GossipData) {
+	if len(selectedConnections) == 0 {
+		return
+	}
+	connections := c.ourself.Connections()
+	c.Lock()
+	defer c.Unlock()
+	// GC - randomly (courtesy of go's map iterator) pick some
+	// existing senders and stop&remove them if the associated
+	// connection is no longer active.  We stop as soon as we
+	// encounter a valid entry; the idea being that when there is
+	// little or no garbage then this executes close to O(1)[1],
+	// whereas when there is lots of garbage we remove it quickly.
+	//
+	// [1] TODO Unfortunately, due to the desire to avoid nested
+	// locks, instead of simply invoking LocalPeer.ConnectionTo(name),
+	// we operate on LocalPeer.Connections(). That is
+	// O(n_our_connections) at best.
+	for conn, sender := range c.senders {
+		if _, found := connections[conn]; !found {
+			delete(c.senders, conn)
+			sender.Stop()
+		} else {
+			break
+		}
+	}
+	// start senders, if necessary, and send.
+	for _, conn := range selectedConnections {
+		sender, found := c.senders[conn]
+		if !found {
+			sender = c.makeSender(conn)
+			c.senders[conn] = sender
+		}
+		sender.Send(data)
+	}
+}
+
+// We have seen a couple of failures which suggest a >128GB slice was encountered.
+// 100MB should be enough for anyone.
+const maxFeasibleMessageLen = 100 * 1024 * 1024
+
+func (c *GossipChannel) makeSender(conn Connection) *GossipSender {
+	return NewGossipSender(func(pending GossipData) {
+		for _, msg := range pending.Encode() {
+			if len(msg) > maxFeasibleMessageLen {
+				panic(fmt.Sprintf("Gossip message too large: len=%d bytes; on channel '%s' from %+v", len(msg), c.name, pending))
+			}
+			protocolMsg := ProtocolMsg{ProtocolGossip, GobEncode(c.name, c.ourself.Name, msg)}
+			conn.(ProtocolSender).SendProtocolMsg(protocolMsg)
+		}
+	})
+}
+
 func (c *GossipChannel) log(args ...interface{}) {
 	log.Println(append(append([]interface{}{}, "[gossip "+c.name+"]:"), args...)...)
 }
+
+func GobEncode(items ...interface{}) []byte {
+	buf := new(bytes.Buffer)
+	enc := gob.NewEncoder(buf)
+	for _, i := range items {
+		checkFatal(enc.Encode(i))
+	}
+	return buf.Bytes()
+}

mesh/gossip_test.go

@@ -1,36 +1,40 @@
-package router
+package mesh
 
 import (
 	"fmt"
 	"sync"
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/require"
-	wt "github.com/weaveworks/weave/testing"
 )
 
 // TODO test gossip unicast; atm we only test topology gossip and
 // surrogates, neither of which employ unicast.
 
-type mockChannelConnection struct {
+type mockGossipConnection struct {
 	RemoteConnection
-	dest *Router
+	dest  *Router
+	start chan struct{}
 }
 
 func NewTestRouter(name string) *Router {
 	peerName, _ := PeerNameFromString(name)
-	router := NewRouter(Config{}, peerName, "nick")
+	router := NewRouter(Config{}, peerName, "nick", nil)
 	router.Start()
 	return router
 }
 
-func (conn *mockChannelConnection) SendProtocolMsg(protocolMsg ProtocolMsg) {
+func (conn *mockGossipConnection) SendProtocolMsg(protocolMsg ProtocolMsg) {
+	<-conn.start
 	if err := conn.dest.handleGossip(protocolMsg.tag, protocolMsg.msg); err != nil {
 		panic(err)
 	}
 }
 
+func (conn *mockGossipConnection) Start() {
+	close(conn.start)
+}
+
 func sendPendingGossip(routers ...*Router) {
 	// Loop until all routers report they didn't send anything
 	for sentSomething := true; sentSomething; {
@@ -41,38 +45,32 @@ func sendPendingGossip(routers ...*Router) {
 	}
 }
 
-func (router *Router) AddTestChannelConnection(r *Router) {
-	fromPeer := NewPeerFrom(router.Ourself.Peer)
-	toPeer := NewPeerFrom(r.Ourself.Peer)
+func AddTestGossipConnection(r1, r2 *Router) {
+	c1 := r1.NewTestGossipConnection(r2)
+	c2 := r2.NewTestGossipConnection(r1)
+	c1.Start()
+	c2.Start()
+}
 
-	r.Peers.FetchWithDefault(fromPeer)    // Has side-effect of incrementing refcount
-	router.Peers.FetchWithDefault(toPeer) //
+func (router *Router) NewTestGossipConnection(r *Router) *mockGossipConnection {
+	to := r.Ourself.Peer
+	toPeer := NewPeer(to.Name, to.NickName, to.UID, 0, to.ShortID)
+	toPeer = router.Peers.FetchWithDefault(toPeer) // Has side-effect of incrementing refcount
 
-	conn := &mockChannelConnection{RemoteConnection{router.Ourself.Peer, toPeer, "", false, true}, r}
+	conn := &mockGossipConnection{
+		RemoteConnection{router.Ourself.Peer, toPeer, "", false, true}, r, make(chan struct{})}
 	router.Ourself.handleAddConnection(conn)
 	router.Ourself.handleConnectionEstablished(conn)
+	return conn
 }
 
-func (router *Router) DeleteTestChannelConnection(r *Router) {
-	fromName := router.Ourself.Peer.Name
+func (router *Router) DeleteTestGossipConnection(r *Router) {
 	toName := r.Ourself.Peer.Name
-
-	fromPeer := r.Peers.Fetch(fromName)
-	toPeer := router.Peers.Fetch(toName)
-
-	r.Peers.Dereference(fromPeer)
-	router.Peers.Dereference(toPeer)
-
 	conn, _ := router.Ourself.ConnectionTo(toName)
+	router.Peers.Dereference(conn.Remote())
 	router.Ourself.handleDeleteConnection(conn)
 }
 
-func TestGossipTopology(t *testing.T) {
-	wt.RunWithTimeout(t, 5*time.Second, func() {
-		implTestGossipTopology(t)
-	})
-}
-
 // Create a Peer representing the receiver router, with connections to
 // the routers supplied as arguments, carrying across all UID and
 // version information.
@@ -95,69 +93,46 @@ func checkTopology(t *testing.T, router *Router, wantedPeers ...*Peer) {
 	router.Peers.RUnlock()
 }
 
-func implTestGossipTopology(t *testing.T) {
+func flushAndCheckTopology(t *testing.T, routers []*Router, wantedPeers ...*Peer) {
+	sendPendingGossip(routers...)
+	for _, r := range routers {
+		checkTopology(t, r, wantedPeers...)
+	}
+}
+
+func TestGossipTopology(t *testing.T) {
 	// Create some peers that will talk to each other
 	r1 := NewTestRouter("01:00:00:01:00:00")
 	r2 := NewTestRouter("02:00:00:02:00:00")
 	r3 := NewTestRouter("03:00:00:03:00:00")
-
+	routers := []*Router{r1, r2, r3}
 	// Check state when they have no connections
 	checkTopology(t, r1, r1.tp())
 	checkTopology(t, r2, r2.tp())
 
 	// Now try adding some connections
-	r1.AddTestChannelConnection(r2)
-	sendPendingGossip(r1, r2)
-	checkTopology(t, r1, r1.tp(r2), r2.tp())
-	checkTopology(t, r2, r1.tp(r2), r2.tp())
-	r2.AddTestChannelConnection(r1)
+	AddTestGossipConnection(r1, r2)
 	sendPendingGossip(r1, r2)
 	checkTopology(t, r1, r1.tp(r2), r2.tp(r1))
 	checkTopology(t, r2, r1.tp(r2), r2.tp(r1))
 
-	// Currently, the connection from 2 to 3 is one-way only
-	r2.AddTestChannelConnection(r3)
-	sendPendingGossip(r1, r2, r3)
-	checkTopology(t, r1, r1.tp(r2), r2.tp(r1, r3), r3.tp())
-	checkTopology(t, r2, r1.tp(r2), r2.tp(r1, r3), r3.tp())
-	// When r2 gossiped to r3, 1 was unreachable from r3 so it got removed from the
-	// list of peers, but remains referenced in the connection from 1 to 3.
-	checkTopology(t, r3, r2.tp(r1, r3), r3.tp())
+	AddTestGossipConnection(r2, r3)
+	flushAndCheckTopology(t, routers, r1.tp(r2), r2.tp(r1, r3), r3.tp(r2))
 
-	// Add a connection from 3 to 1 and now r1 is reachable.
-	r3.AddTestChannelConnection(r1)
-	sendPendingGossip(r1, r2, r3)
-	checkTopology(t, r1, r1.tp(r2), r2.tp(r1, r3), r3.tp(r1))
-	checkTopology(t, r2, r1.tp(r2), r2.tp(r1, r3), r3.tp(r1))
-	checkTopology(t, r3, r1.tp(), r2.tp(r1, r3), r3.tp(r1))
-
-	r1.AddTestChannelConnection(r3)
-	sendPendingGossip(r1, r2, r3)
-	checkTopology(t, r1, r1.tp(r2, r3), r2.tp(r1, r3), r3.tp(r1))
-	checkTopology(t, r2, r1.tp(r2, r3), r2.tp(r1, r3), r3.tp(r1))
-	checkTopology(t, r3, r1.tp(r2, r3), r2.tp(r1, r3), r3.tp(r1))
+	AddTestGossipConnection(r3, r1)
+	flushAndCheckTopology(t, routers, r1.tp(r2, r3), r2.tp(r1, r3), r3.tp(r1, r2))
 
 	// Drop the connection from 2 to 3
-	r2.DeleteTestChannelConnection(r3)
-	sendPendingGossip(r1, r2, r3)
-	checkTopology(t, r1, r1.tp(r2, r3), r2.tp(r1), r3.tp(r1))
-	checkTopology(t, r2, r1.tp(r2, r3), r2.tp(r1))
-	checkTopology(t, r3, r1.tp(r2, r3), r2.tp(r1), r3.tp(r1))
+	r2.DeleteTestGossipConnection(r3)
+	flushAndCheckTopology(t, routers, r1.tp(r2, r3), r2.tp(r1), r3.tp(r1, r2))
 
 	// Drop the connection from 1 to 3
-	r1.DeleteTestChannelConnection(r3)
+	r1.DeleteTestGossipConnection(r3)
 	sendPendingGossip(r1, r2, r3)
-	checkTopology(t, r1, r1.tp(r2), r2.tp(r1), r3.tp(r1))
-
-	checkTopology(t, r1, r1.tp(r2), r2.tp(r1), r3.tp(r1))
+	checkTopology(t, r1, r1.tp(r2), r2.tp(r1))
 	checkTopology(t, r2, r1.tp(r2), r2.tp(r1))
 	// r3 still thinks r1 has a connection to it
-	checkTopology(t, r3, r1.tp(r2, r3), r2.tp(r1), r3.tp(r1))
-
-	// On a timer, r3 will gossip to r1
-	r3.SendAllGossip()
-	sendPendingGossip(r1, r2, r3)
-	checkTopology(t, r1, r1.tp(r2), r2.tp(r1), r3.tp(r1))
+	checkTopology(t, r3, r1.tp(r2, r3), r2.tp(r1), r3.tp(r1, r2))
 }
 
 func TestGossipSurrogate(t *testing.T) {
@@ -165,14 +140,10 @@ func TestGossipSurrogate(t *testing.T) {
 	r1 := NewTestRouter("01:00:00:01:00:00")
 	r2 := NewTestRouter("02:00:00:02:00:00")
 	r3 := NewTestRouter("03:00:00:03:00:00")
-	r1.AddTestChannelConnection(r2)
-	r2.AddTestChannelConnection(r1)
-	r3.AddTestChannelConnection(r2)
-	r2.AddTestChannelConnection(r3)
-	sendPendingGossip(r1, r2, r3)
-	checkTopology(t, r1, r1.tp(r2), r2.tp(r1, r3), r3.tp(r2))
-	checkTopology(t, r2, r1.tp(r2), r2.tp(r1, r3), r3.tp(r2))
-	checkTopology(t, r3, r1.tp(r2), r2.tp(r1, r3), r3.tp(r2))
+	routers := []*Router{r1, r2, r3}
+	AddTestGossipConnection(r1, r2)
+	AddTestGossipConnection(r3, r2)
+	flushAndCheckTopology(t, routers, r1.tp(r2), r2.tp(r1, r3), r3.tp(r2))
 
 	// create a gossiper at either end, but not the middle
 	g1 := newTestGossiper()
@@ -238,10 +209,10 @@ func (g *testGossiper) OnGossip(update []byte) (GossipData, error) {
 			g.state[v] = void
 		}
 	}
-	if len(delta) > 0 {
-		return NewSurrogateGossipData(delta), nil
+	if len(delta) == 0 {
+		return nil, nil
 	}
-	return nil, nil
+	return NewSurrogateGossipData(delta), nil
 }
 
 func (g *testGossiper) checkHas(t *testing.T, vs ...byte) {

mesh/local_peer.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"fmt"
@@ -19,8 +19,7 @@ type LocalPeerAction func()
 func NewLocalPeer(name PeerName, nickName string, router *Router) *LocalPeer {
 	actionChan := make(chan LocalPeerAction, ChannelSize)
 	peer := &LocalPeer{
-		Peer: NewPeer(name, nickName, randomPeerUID(), 0,
-			randomPeerShortID()),
+		Peer:       NewPeer(name, nickName, randomPeerUID(), 0, randomPeerShortID()),
 		router:     router,
 		actionChan: actionChan,
 	}
@@ -63,21 +62,16 @@ func (peer *LocalPeer) CreateConnection(peerAddr string, acceptNewPeer bool) err
 	if err := peer.checkConnectionLimit(); err != nil {
 		return err
 	}
-	tcpAddr, tcpErr := net.ResolveTCPAddr("tcp4", peerAddr)
-	udpAddr, udpErr := net.ResolveUDPAddr("udp4", peerAddr)
-	if tcpErr != nil || udpErr != nil {
-		// they really should have the same value, but just in case...
-		if tcpErr == nil {
-			return udpErr
-		}
-		return tcpErr
+	tcpAddr, err := net.ResolveTCPAddr("tcp4", peerAddr)
+	if err != nil {
+		return err
 	}
 	tcpConn, err := net.DialTCP("tcp4", nil, tcpAddr)
 	if err != nil {
 		return err
 	}
 	connRemote := NewRemoteConnection(peer.Peer, nil, tcpConn.RemoteAddr().String(), true, false)
-	StartLocalConnection(connRemote, tcpConn, udpAddr, peer.router, acceptNewPeer)
+	StartLocalConnection(connRemote, tcpConn, peer.router, acceptNewPeer)
 	return nil
 }
 
@@ -255,3 +249,13 @@ func (peer *LocalPeer) setShortID(shortID PeerShortID) {
 	peer.ShortID = shortID
 	peer.Version++
 }
+
+func (peer *LocalPeer) setVersionBeyond(version uint64) bool {
+	peer.Lock()
+	defer peer.Unlock()
+	if version >= peer.Version {
+		peer.Version = version + 1
+		return true
+	}
+	return false
+}

mesh/mocks_test.go

@@ -3,7 +3,7 @@
 // It supplies some mock implementations to other unit tests, and is
 // named "...test.go" so it is only compiled under `go test`.
 
-package router
+package mesh
 
 import (
 	"fmt"
@@ -17,7 +17,7 @@ func (peers *Peers) AddTestConnection(p *Peer) {
 	summary := p.PeerSummary
 	summary.Version = 0
 	toPeer := NewPeerFromSummary(summary)
-	peers.FetchWithDefault(toPeer) // Has side-effect of incrementing refcount
+	toPeer = peers.FetchWithDefault(toPeer) // Has side-effect of incrementing refcount
 	conn := newMockConnection(peers.ourself.Peer, toPeer)
 	peers.ourself.addConnection(conn)
 	peers.ourself.connectionEstablished(conn)

mesh/overlay.go

@@ -0,0 +1,116 @@
+package mesh
+
+import (
+	"net"
+)
+
+type Overlay interface {
+	// Enhance a features map with overlay-related features
+	AddFeaturesTo(map[string]string)
+
+	// Prepare on overlay connection. The connection should remain
+	// passive until it has been Confirm()ed.
+	PrepareConnection(OverlayConnectionParams) (OverlayConnection, error)
+
+	// Obtain diagnostic information specific to the overlay
+	Diagnostics() interface{}
+}
+
+type OverlayConnectionParams struct {
+	RemotePeer *Peer
+
+	// The local address of the corresponding TCP connection. Used to
+	// derive the local IP address for sending. May differ for
+	// different overlay connections.
+	LocalAddr *net.TCPAddr
+
+	// The remote address of the corresponding TCP connection. Used to
+	// determine the address to send to, but only if the TCP
+	// connection is outbound. Otherwise the Overlay needs to discover
+	// it (e.g. from incoming datagrams).
+	RemoteAddr *net.TCPAddr
+
+	// Is the corresponding TCP connection outbound?
+	Outbound bool
+
+	// Unique identifier for this connection
+	ConnUID uint64
+
+	// Session key, if connection is encrypted; nil otherwise.
+	//
+	// NB: overlay connections must take care not to use nonces which
+	// may collide with those of the main connection. These nonces are
+	// 192 bits, with the top most bit unspecified, the next bit set
+	// to 1, followed by 126 zero bits, and a message sequence number
+	// in the lowest 64 bits.
+	SessionKey *[32]byte
+
+	// Function to send a control message to the counterpart
+	// overlay connection.
+	SendControlMessage func(tag byte, msg []byte) error
+
+	// Features passed at connection initiation
+	Features map[string]string
+}
+
+// All of the machinery to manage overlay connectivity to a particular
+// peer
+type OverlayConnection interface {
+	// Confirm that the connection is really wanted, and so the
+	// Overlay should begin heartbeats etc. to verify the operation of
+	// the overlay connection.
+	Confirm()
+
+	// A channel indicating that the overlay connection is
+	// established, i.e. its operation has been confirmed.
+	EstablishedChannel() <-chan struct{}
+
+	// A channel indicating an error from the overlay connection.  The
+	// overlay connection is not expected to be operational after the
+	// first error, so the channel only needs to buffer a single
+	// error.
+	ErrorChannel() <-chan error
+
+	Stop()
+
+	// Handle a message from the peer.  'tag' exists for
+	// compatibility, and should always be
+	// ProtocolOverlayControlMessage for non-sleeve overlays.
+	ControlMessage(tag byte, msg []byte)
+
+	// User facing overlay name
+	DisplayName() string
+}
+
+type NullOverlay struct{}
+
+func (NullOverlay) AddFeaturesTo(map[string]string) {
+}
+
+func (NullOverlay) PrepareConnection(OverlayConnectionParams) (OverlayConnection, error) {
+	return NullOverlay{}, nil
+}
+
+func (NullOverlay) Diagnostics() interface{} {
+	return nil
+}
+func (NullOverlay) Confirm() {
+}
+
+func (NullOverlay) EstablishedChannel() <-chan struct{} {
+	return nil
+}
+
+func (NullOverlay) ErrorChannel() <-chan error {
+	return nil
+}
+
+func (NullOverlay) Stop() {
+}
+
+func (NullOverlay) ControlMessage(byte, []byte) {
+}
+
+func (NullOverlay) DisplayName() string {
+	return "null"
+}

mesh/peer.go

@@ -1,15 +1,37 @@
-package router
+package mesh
 
 import (
+	"crypto/rand"
+	"encoding/binary"
 	"fmt"
 	"sort"
 	"strconv"
 )
 
+func randBytes(n int) []byte {
+	buf := make([]byte, n)
+	_, err := rand.Read(buf)
+	checkFatal(err)
+	return buf
+}
+
+func randUint64() (r uint64) {
+	return binary.LittleEndian.Uint64(randBytes(8))
+}
+
+func randUint16() (r uint16) {
+	return binary.LittleEndian.Uint16(randBytes(2))
+}
+
 type PeerUID uint64
 
 func randomPeerUID() PeerUID {
-	return PeerUID(randUint64())
+	for {
+		uid := randUint64()
+		if uid != 0 { // uid 0 is reserved for peer placeholder
+			return PeerUID(uid)
+		}
+	}
 }
 
 func ParsePeerUID(s string) (PeerUID, error) {
@@ -45,6 +67,18 @@ type Peer struct {
 	connections   map[PeerName]Connection
 }
 
+type ListOfPeers []*Peer
+
+func (lop ListOfPeers) Len() int {
+	return len(lop)
+}
+func (lop ListOfPeers) Swap(i, j int) {
+	lop[i], lop[j] = lop[j], lop[i]
+}
+func (lop ListOfPeers) Less(i, j int) bool {
+	return lop[i].Name < lop[j].Name
+}
+
 type ConnectionSet map[Connection]struct{}
 
 func NewPeerFromSummary(summary PeerSummary) *Peer {
@@ -66,6 +100,10 @@ func NewPeer(name PeerName, nickName string, uid PeerUID, version uint64, shortI
 	})
 }
 
+func NewPeerPlaceholder(name PeerName) *Peer {
+	return NewPeerFromSummary(PeerSummary{NameByte: name.Bin()})
+}
+
 func NewPeerFrom(peer *Peer) *Peer {
 	return NewPeerFromSummary(peer.PeerSummary)
 }

mesh/peer_name_hash.go

@@ -3,7 +3,7 @@
 // Let peer names be sha256 hashes...of anything (as long as it's
 // unique).
 
-package router
+package mesh
 
 import (
 	"crypto/sha256"

mesh/peer_name_mac.go

@@ -15,7 +15,7 @@
 // name. In particular it doesn't actually have to be the MAC of, say,
 // the network interface the peer is sniffing on.
 
-package router
+package mesh
 
 import (
 	"net"
@@ -56,3 +56,20 @@ func (name PeerName) Bin() []byte {
 func (name PeerName) String() string {
 	return intmac(uint64(name)).String()
 }
+
+func macint(mac net.HardwareAddr) (r uint64) {
+	for _, b := range mac {
+		r <<= 8
+		r |= uint64(b)
+	}
+	return
+}
+
+func intmac(key uint64) (r net.HardwareAddr) {
+	r = make([]byte, 6)
+	for i := 5; i >= 0; i-- {
+		r[i] = byte(key)
+		key >>= 8
+	}
+	return
+}

mesh/peers.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"bytes"
@@ -8,6 +8,8 @@ import (
 	"sync"
 )
 
+var void = struct{}{}
+
 type Peers struct {
 	sync.RWMutex
 	ourself   *LocalPeer
@@ -29,14 +31,6 @@ type ShortIDPeers struct {
 	others []*Peer
 }
 
-type UnknownPeerError struct {
-	Name PeerName
-}
-
-type NameCollisionError struct {
-	Name PeerName
-}
-
 type PeerNameSet map[PeerName]struct{}
 
 type ConnectionSummary struct {
@@ -57,6 +51,9 @@ type PeersPendingNotifications struct {
 
 	// The local short ID needs reassigning due to a collision
 	reassignLocalShortID bool
+
+	// The local peer was modified
+	localPeerModified bool
 }
 
 func NewPeers(ourself *LocalPeer) *Peers {
@@ -89,7 +86,8 @@ func (peers *Peers) OnInvalidateShortIDs(callback func()) {
 }
 
 func (peers *Peers) unlockAndNotify(pending *PeersPendingNotifications) {
-	broadcastLocalPeer := pending.reassignLocalShortID && peers.reassignLocalShortID(pending)
+	broadcastLocalPeer := (pending.reassignLocalShortID && peers.reassignLocalShortID(pending)) ||
+		pending.localPeerModified
 	onGC := peers.onGC
 	onInvalidateShortIDs := peers.onInvalidateShortIDs
 	peers.Unlock()
@@ -327,11 +325,7 @@ func (peers *Peers) ApplyUpdate(update []byte) (PeerNameSet, PeerNameSet, error)
 		return nil, nil, err
 	}
 
-	ourVersion := peers.ourself.Version
-
-	// By this point, we know the update doesn't refer to any peers we
-	// have no knowledge of. We can now apply the update. Start by
-	// adding in any new peers.
+	// Add new peers
 	for name, newPeer := range newPeers {
 		peers.byName[name] = newPeer
 		peers.addByShortID(newPeer, &pending)
@@ -349,13 +343,6 @@ func (peers *Peers) ApplyUpdate(update []byte) (PeerNameSet, PeerNameSet, error)
 		updateNames[peer.Name] = void
 	}
 
-	if peers.ourself.Version != ourVersion {
-		// Our short id changed, i.e. due to a short ID
-		// change.  So we need to include ourself in the
-		// update
-		newUpdate[peers.ourself.Name] = void
-	}
-
 	return updateNames, newUpdate, nil
 }
 
@@ -434,12 +421,8 @@ func (peers *Peers) decodeUpdate(update []byte) (newPeers map[PeerName]*Peer, de
 		newPeer := NewPeerFromSummary(peerSummary)
 		decodedUpdate = append(decodedUpdate, newPeer)
 		decodedConns = append(decodedConns, connSummaries)
-		existingPeer, found := peers.byName[newPeer.Name]
-		if !found {
+		if _, found := peers.byName[newPeer.Name]; !found {
 			newPeers[newPeer.Name] = newPeer
-		} else if existingPeer.UID != newPeer.UID {
-			err = NameCollisionError{Name: newPeer.Name}
-			return
 		}
 	}
 
@@ -452,10 +435,8 @@ func (peers *Peers) decodeUpdate(update []byte) (newPeers map[PeerName]*Peer, de
 			if _, found := peers.byName[remoteName]; found {
 				continue
 			}
-			// Update refers to a peer which we have no knowledge
-			// of. Thus we can't apply the update. Abort.
-			err = UnknownPeerError{remoteName}
-			return
+			// Update refers to a peer which we have no knowledge of.
+			newPeers[remoteName] = NewPeerPlaceholder(remoteName)
 		}
 	}
 	return
@@ -467,36 +448,41 @@ func (peers *Peers) applyUpdate(decodedUpdate []*Peer, decodedConns [][]Connecti
 		connSummaries := decodedConns[idx]
 		name := newPeer.Name
 		// guaranteed to find peer in the peers.byName
-		peer := peers.byName[name]
-		if peer != newPeer &&
-			(peer == peers.ourself.Peer || peer.Version >= newPeer.Version) {
-			// Nobody but us updates us. And if we know more about a
-			// peer than what's in the the update, we ignore the
-			// latter.
-			continue
+		switch peer := peers.byName[name]; peer {
+		case peers.ourself.Peer:
+			if newPeer.UID != peer.UID {
+				// The update contains information about an old
+				// incarnation of ourselves. We increase our version
+				// number beyond that which we received, so our
+				// information supersedes the old one when it is
+				// received by other peers.
+				pending.localPeerModified = peers.ourself.setVersionBeyond(newPeer.Version)
+			}
+		case newPeer:
+			peer.connections = makeConnsMap(peer, connSummaries, peers.byName)
+			newUpdate[name] = void
+		default: // existing peer
+			if newPeer.Version < peer.Version ||
+				(newPeer.Version == peer.Version &&
+					(newPeer.UID < peer.UID ||
+						(newPeer.UID == peer.UID &&
+							(!newPeer.HasShortID || peer.HasShortID)))) {
+				continue
+			}
+			peer.Version = newPeer.Version
+			peer.UID = newPeer.UID
+			peer.NickName = newPeer.NickName
+			peer.connections = makeConnsMap(peer, connSummaries, peers.byName)
+
+			if newPeer.ShortID != peer.ShortID || newPeer.HasShortID != peer.HasShortID {
+				peers.deleteByShortID(peer, pending)
+				peer.ShortID = newPeer.ShortID
+				peer.HasShortID = newPeer.HasShortID
+				peers.addByShortID(peer, pending)
+			}
+			newUpdate[name] = void
 		}
-		// If we're here, either it was a new peer, or the update has
-		// more info about the peer than we do. Either case, we need
-		// to set version and conns and include the updated peer in
-		// the outgoing update.
-
-		// Can peer have been updated by anyone else in the mean time?
-		// No - we know that peer is not ourself, so the only prospect
-		// for an update would be someone else calling
-		// router.Peers.ApplyUpdate. But ApplyUpdate takes the Lock on
-		// the router.Peers, so there can be no race here.
-		peer.Version = newPeer.Version
-		peer.connections = makeConnsMap(peer, connSummaries, peers.byName)
-
-		if newPeer.ShortID != peer.ShortID {
-			peers.deleteByShortID(peer, pending)
-			peer.ShortID = newPeer.ShortID
-			peers.addByShortID(peer, pending)
-		}
-
-		newUpdate[name] = void
 	}
-
 	return newUpdate
 }
 

mesh/peers_test.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"fmt"

mesh/protocol.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"bytes"
@@ -329,9 +329,9 @@ type ProtocolTag byte
 
 const (
 	ProtocolHeartbeat = iota
-	ProtocolConnectionEstablished
-	ProtocolFragmentationReceived
-	ProtocolPMTUVerified
+	ProtocolReserved1 // legacy overlay control messages
+	ProtocolReserved2 //
+	ProtocolReserved3 //
 	ProtocolGossip
 	ProtocolGossipUnicast
 	ProtocolGossipBroadcast

mesh/protocol_crypto.go

@@ -0,0 +1,180 @@
+package mesh
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/binary"
+	"encoding/gob"
+	"fmt"
+	"io"
+	"sync"
+
+	"golang.org/x/crypto/nacl/box"
+	"golang.org/x/crypto/nacl/secretbox"
+)
+
+const MaxTCPMsgSize = 10 * 1024 * 1024
+
+func GenerateKeyPair() (publicKey, privateKey *[32]byte, err error) {
+	return box.GenerateKey(rand.Reader)
+}
+
+func FormSessionKey(remotePublicKey, localPrivateKey *[32]byte, secretKey []byte) *[32]byte {
+	var sharedKey [32]byte
+	box.Precompute(&sharedKey, remotePublicKey, localPrivateKey)
+	sharedKeySlice := sharedKey[:]
+	sharedKeySlice = append(sharedKeySlice, secretKey...)
+	sessionKey := sha256.Sum256(sharedKeySlice)
+	return &sessionKey
+}
+
+// TCP Senders/Receivers
+
+// The lowest 64 bits of the nonce contain the message sequence
+// number. The top most bit indicates the connection polarity at the
+// sender - '1' for outbound; the next indicates protocol type - '1'
+// for TCP. The remaining 126 bits are zero. The polarity is needed so
+// that the two ends of a connection do not use the same nonces; the
+// protocol type so that the TCP connection nonces are distinct from
+// nonces used by overlay connections, if they share the session key.
+// This is a requirement of the NaCl Security Model; see
+// http://nacl.cr.yp.to/box.html.
+type TCPCryptoState struct {
+	sessionKey *[32]byte
+	nonce      [24]byte
+	seqNo      uint64
+}
+
+func NewTCPCryptoState(sessionKey *[32]byte, outbound bool) *TCPCryptoState {
+	s := &TCPCryptoState{sessionKey: sessionKey}
+	if outbound {
+		s.nonce[0] |= (1 << 7)
+	}
+	s.nonce[0] |= (1 << 6)
+	return s
+}
+
+func (s *TCPCryptoState) advance() {
+	s.seqNo++
+	binary.BigEndian.PutUint64(s.nonce[16:24], s.seqNo)
+}
+
+type TCPSender interface {
+	Send([]byte) error
+}
+
+type GobTCPSender struct {
+	encoder *gob.Encoder
+}
+
+type LengthPrefixTCPSender struct {
+	writer io.Writer
+}
+
+type EncryptedTCPSender struct {
+	sync.RWMutex
+	sender TCPSender
+	state  *TCPCryptoState
+}
+
+func NewGobTCPSender(encoder *gob.Encoder) *GobTCPSender {
+	return &GobTCPSender{encoder: encoder}
+}
+
+func (sender *GobTCPSender) Send(msg []byte) error {
+	return sender.encoder.Encode(msg)
+}
+
+func NewLengthPrefixTCPSender(writer io.Writer) *LengthPrefixTCPSender {
+	return &LengthPrefixTCPSender{writer: writer}
+}
+
+func (sender *LengthPrefixTCPSender) Send(msg []byte) error {
+	l := len(msg)
+	if l > MaxTCPMsgSize {
+		return fmt.Errorf("outgoing message exceeds maximum size: %d > %d", l, MaxTCPMsgSize)
+	}
+	// We copy the message so we can send it in a single Write
+	// operation, thus making this thread-safe without locking.
+	prefixedMsg := make([]byte, 4+l)
+	binary.BigEndian.PutUint32(prefixedMsg, uint32(l))
+	copy(prefixedMsg[4:], msg)
+	_, err := sender.writer.Write(prefixedMsg)
+	return err
+}
+
+func NewEncryptedTCPSender(sender TCPSender, sessionKey *[32]byte, outbound bool) *EncryptedTCPSender {
+	return &EncryptedTCPSender{sender: sender, state: NewTCPCryptoState(sessionKey, outbound)}
+}
+
+func (sender *EncryptedTCPSender) Send(msg []byte) error {
+	sender.Lock()
+	defer sender.Unlock()
+	encodedMsg := secretbox.Seal(nil, msg, &sender.state.nonce, sender.state.sessionKey)
+	sender.state.advance()
+	return sender.sender.Send(encodedMsg)
+}
+
+type TCPReceiver interface {
+	Receive() ([]byte, error)
+}
+
+type GobTCPReceiver struct {
+	decoder *gob.Decoder
+}
+
+type LengthPrefixTCPReceiver struct {
+	reader io.Reader
+}
+
+type EncryptedTCPReceiver struct {
+	receiver TCPReceiver
+	state    *TCPCryptoState
+}
+
+func NewGobTCPReceiver(decoder *gob.Decoder) *GobTCPReceiver {
+	return &GobTCPReceiver{decoder: decoder}
+}
+
+func (receiver *GobTCPReceiver) Receive() ([]byte, error) {
+	var msg []byte
+	err := receiver.decoder.Decode(&msg)
+	return msg, err
+}
+
+func NewLengthPrefixTCPReceiver(reader io.Reader) *LengthPrefixTCPReceiver {
+	return &LengthPrefixTCPReceiver{reader: reader}
+}
+
+func (receiver *LengthPrefixTCPReceiver) Receive() ([]byte, error) {
+	lenPrefix := make([]byte, 4)
+	if _, err := io.ReadFull(receiver.reader, lenPrefix); err != nil {
+		return nil, err
+	}
+	l := binary.BigEndian.Uint32(lenPrefix)
+	if l > MaxTCPMsgSize {
+		return nil, fmt.Errorf("incoming message exceeds maximum size: %d > %d", l, MaxTCPMsgSize)
+	}
+	msg := make([]byte, l)
+	_, err := io.ReadFull(receiver.reader, msg)
+	return msg, err
+}
+
+func NewEncryptedTCPReceiver(receiver TCPReceiver, sessionKey *[32]byte, outbound bool) *EncryptedTCPReceiver {
+	return &EncryptedTCPReceiver{receiver: receiver, state: NewTCPCryptoState(sessionKey, !outbound)}
+}
+
+func (receiver *EncryptedTCPReceiver) Receive() ([]byte, error) {
+	msg, err := receiver.receiver.Receive()
+	if err != nil {
+		return nil, err
+	}
+
+	decodedMsg, success := secretbox.Open(nil, msg, &receiver.state.nonce, receiver.state.sessionKey)
+	if !success {
+		return nil, fmt.Errorf("Unable to decrypt TCP msg")
+	}
+
+	receiver.state.advance()
+	return decodedMsg, nil
+}

mesh/protocol_test.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"io"

mesh/router.go

@@ -0,0 +1,198 @@
+package mesh
+
+import (
+	"fmt"
+	"math"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/weaveworks/weave/common"
+)
+
+const (
+	Port           = 6783
+	ChannelSize    = 16
+	TCPHeartbeat   = 30 * time.Second
+	GossipInterval = 30 * time.Second
+	MaxDuration    = time.Duration(math.MaxInt64)
+
+	acceptMaxTokens  = 100                    // [1]
+	acceptTokenDelay = 100 * time.Millisecond // [2]
+)
+
+// [1] capacity of token bucket for rate limiting accepts
+
+// [2] control rate at which new tokens are added to the bucket
+
+var (
+	log        = common.Log
+	checkFatal = common.CheckFatal
+	checkWarn  = common.CheckWarn
+)
+
+type Config struct {
+	Port               int
+	ProtocolMinVersion byte
+	Password           []byte
+	ConnLimit          int
+	PeerDiscovery      bool
+	TrustedSubnets     []*net.IPNet
+}
+
+type Router struct {
+	Config
+	Overlay         Overlay
+	Ourself         *LocalPeer
+	Peers           *Peers
+	Routes          *Routes
+	ConnectionMaker *ConnectionMaker
+	gossipLock      sync.RWMutex
+	gossipChannels  GossipChannels
+	TopologyGossip  Gossip
+	acceptLimiter   *TokenBucket
+}
+
+func NewRouter(config Config, name PeerName, nickName string, overlay Overlay) *Router {
+	router := &Router{Config: config, gossipChannels: make(GossipChannels)}
+
+	if overlay == nil {
+		overlay = NullOverlay{}
+	}
+
+	router.Overlay = overlay
+	router.Ourself = NewLocalPeer(name, nickName, router)
+	router.Peers = NewPeers(router.Ourself)
+	router.Peers.OnGC(func(peer *Peer) {
+		log.Println("Removed unreachable peer", peer)
+	})
+	router.Routes = NewRoutes(router.Ourself, router.Peers)
+	router.ConnectionMaker = NewConnectionMaker(router.Ourself, router.Peers, router.Port, router.PeerDiscovery)
+	router.TopologyGossip = router.NewGossip("topology", router)
+	router.acceptLimiter = NewTokenBucket(acceptMaxTokens, acceptTokenDelay)
+
+	return router
+}
+
+// Start listening for TCP connections. This is separate from
+// NewRouter so that gossipers can register before we start forming
+// connections.
+func (router *Router) Start() {
+	router.listenTCP(router.Port)
+}
+
+func (router *Router) Stop() error {
+	// TODO: perform graceful shutdown...
+	return nil
+}
+
+func (router *Router) UsingPassword() bool {
+	return router.Password != nil
+}
+
+func (router *Router) listenTCP(localPort int) {
+	localAddr, err := net.ResolveTCPAddr("tcp4", fmt.Sprint(":", localPort))
+	checkFatal(err)
+	ln, err := net.ListenTCP("tcp4", localAddr)
+	checkFatal(err)
+	go func() {
+		defer ln.Close()
+		for {
+			tcpConn, err := ln.AcceptTCP()
+			if err != nil {
+				log.Errorln(err)
+				continue
+			}
+			router.acceptTCP(tcpConn)
+			router.acceptLimiter.Wait()
+		}
+	}()
+}
+
+func (router *Router) acceptTCP(tcpConn *net.TCPConn) {
+	remoteAddrStr := tcpConn.RemoteAddr().String()
+	log.Printf("->[%s] connection accepted", remoteAddrStr)
+	connRemote := NewRemoteConnection(router.Ourself.Peer, nil, remoteAddrStr, false, false)
+	StartLocalConnection(connRemote, tcpConn, router, true)
+}
+
+// Gossiper methods - the Router is the topology Gossiper
+
+type TopologyGossipData struct {
+	peers  *Peers
+	update PeerNameSet
+}
+
+func (d *TopologyGossipData) Merge(other GossipData) GossipData {
+	names := make(PeerNameSet)
+	for name := range d.update {
+		names[name] = void
+	}
+	for name := range other.(*TopologyGossipData).update {
+		names[name] = void
+	}
+	return &TopologyGossipData{peers: d.peers, update: names}
+}
+
+func (d *TopologyGossipData) Encode() [][]byte {
+	return [][]byte{d.peers.EncodePeers(d.update)}
+}
+
+func (router *Router) BroadcastTopologyUpdate(update []*Peer) {
+	names := make(PeerNameSet)
+	for _, p := range update {
+		names[p.Name] = void
+	}
+	router.TopologyGossip.GossipBroadcast(
+		&TopologyGossipData{peers: router.Peers, update: names})
+}
+
+func (router *Router) OnGossipUnicast(sender PeerName, msg []byte) error {
+	return fmt.Errorf("unexpected topology gossip unicast: %v", msg)
+}
+
+func (router *Router) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error) {
+	origUpdate, _, err := router.applyTopologyUpdate(update)
+	if err != nil || len(origUpdate) == 0 {
+		return nil, err
+	}
+	return &TopologyGossipData{peers: router.Peers, update: origUpdate}, nil
+}
+
+func (router *Router) Gossip() GossipData {
+	return &TopologyGossipData{peers: router.Peers, update: router.Peers.Names()}
+}
+
+func (router *Router) OnGossip(update []byte) (GossipData, error) {
+	_, newUpdate, err := router.applyTopologyUpdate(update)
+	if err != nil || len(newUpdate) == 0 {
+		return nil, err
+	}
+	return &TopologyGossipData{peers: router.Peers, update: newUpdate}, nil
+}
+
+func (router *Router) applyTopologyUpdate(update []byte) (PeerNameSet, PeerNameSet, error) {
+	origUpdate, newUpdate, err := router.Peers.ApplyUpdate(update)
+	if err != nil {
+		return nil, nil, err
+	}
+	if len(newUpdate) > 0 {
+		router.ConnectionMaker.Refresh()
+		router.Routes.Recalculate()
+	}
+	return origUpdate, newUpdate, nil
+}
+
+func (router *Router) Trusts(remote *RemoteConnection) bool {
+	if tcpAddr, err := net.ResolveTCPAddr("tcp4", remote.remoteTCPAddr); err == nil {
+		for _, trustedSubnet := range router.TrustedSubnets {
+			if trustedSubnet.Contains(tcpAddr.IP) {
+				return true
+			}
+		}
+	} else {
+		// Should not happen as remoteTCPAddr was obtained from TCPConn
+		log.Errorf("Unable to parse remote TCP addr: %s", err)
+	}
+	return false
+}

mesh/routes.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"math"
@@ -12,7 +12,7 @@ type Routes struct {
 	sync.RWMutex
 	ourself      *LocalPeer
 	peers        *Peers
-	onChange     func()
+	onChange     []func()
 	unicast      unicastRoutes
 	unicastAll   unicastRoutes // [1]
 	broadcast    broadcastRoutes
@@ -23,13 +23,12 @@ type Routes struct {
 	// symmetric ones
 }
 
-func NewRoutes(ourself *LocalPeer, peers *Peers, onChange func()) *Routes {
+func NewRoutes(ourself *LocalPeer, peers *Peers) *Routes {
 	recalculate := make(chan *struct{}, 1)
 	wait := make(chan chan struct{})
 	routes := &Routes{
 		ourself:      ourself,
 		peers:        peers,
-		onChange:     onChange,
 		unicast:      make(unicastRoutes),
 		unicastAll:   make(unicastRoutes),
 		broadcast:    make(broadcastRoutes),
@@ -44,6 +43,12 @@ func NewRoutes(ourself *LocalPeer, peers *Peers, onChange func()) *Routes {
 	return routes
 }
 
+func (routes *Routes) OnChange(callback func()) {
+	routes.Lock()
+	defer routes.Unlock()
+	routes.onChange = append(routes.onChange, callback)
+}
+
 func (routes *Routes) PeerNames() PeerNameSet {
 	return routes.peers.Names()
 }
@@ -87,20 +92,24 @@ func (routes *Routes) BroadcastAll(name PeerName) []PeerName {
 // returns a higher proportion of neighbours than elsewhere. In
 // extremis, on peers with fewer than log2(n_peers) neighbours, all
 // neighbours are returned.
-func (routes *Routes) RandomNeighbours(except PeerName) PeerNameSet {
-	res := make(PeerNameSet)
+func (routes *Routes) RandomNeighbours(except PeerName) []PeerName {
+	destinations := make(PeerNameSet)
 	routes.RLock()
 	defer routes.RUnlock()
 	count := int(math.Log2(float64(len(routes.unicastAll))))
 	// depends on go's random map iteration
 	for _, dst := range routes.unicastAll {
 		if dst != UnknownPeerName && dst != except {
-			res[dst] = void
-			if len(res) >= count {
+			destinations[dst] = void
+			if len(destinations) >= count {
 				break
 			}
 		}
 	}
+	res := make([]PeerName, 0, len(destinations))
+	for dst := range destinations {
+		res = append(res, dst)
+	}
 	return res
 }
 
@@ -159,10 +168,13 @@ func (routes *Routes) calculate() {
 	routes.unicastAll = unicastAll
 	routes.broadcast = broadcast
 	routes.broadcastAll = broadcastAll
+	onChange := routes.onChange
 	routes.Unlock()
 
 	if !unicast.equals(oldUnicast) || !broadcast.equals(oldBroadcast) {
-		routes.onChange()
+		for _, callback := range onChange {
+			callback()
+		}
 	}
 }
 

mesh/status.go

@@ -1,8 +1,8 @@
-package router
+package mesh
 
 import (
 	"fmt"
-	"time"
+	"net"
 )
 
 type Status struct {
@@ -14,22 +14,13 @@ type Status struct {
 	Name               string
 	NickName           string
 	Port               int
-	Interface          string
-	CaptureStats       map[string]int
-	MACs               []MACStatus
 	Peers              []PeerStatus
 	UnicastRoutes      []UnicastRouteStatus
 	BroadcastRoutes    []BroadcastRouteStatus
 	Connections        []LocalConnectionStatus
 	Targets            []string
 	OverlayDiagnostics interface{}
-}
-
-type MACStatus struct {
-	Mac      string
-	Name     string
-	NickName string
-	LastSeen time.Time
+	TrustedSubnets     []string
 }
 
 type PeerStatus struct {
@@ -75,31 +66,13 @@ func NewStatus(router *Router) *Status {
 		router.Ourself.Name.String(),
 		router.Ourself.NickName,
 		router.Port,
-		router.Bridge.String(),
-		router.Bridge.Stats(),
-		NewMACStatusSlice(router.Macs),
 		NewPeerStatusSlice(router.Peers),
 		NewUnicastRouteStatusSlice(router.Routes),
 		NewBroadcastRouteStatusSlice(router.Routes),
 		NewLocalConnectionStatusSlice(router.ConnectionMaker),
 		NewTargetSlice(router.ConnectionMaker),
-		router.Overlay.Diagnostics()}
-}
-
-func NewMACStatusSlice(cache *MacCache) []MACStatus {
-	cache.RLock()
-	defer cache.RUnlock()
-
-	var slice []MACStatus
-	for key, entry := range cache.table {
-		slice = append(slice, MACStatus{
-			intmac(key).String(),
-			entry.peer.Name.String(),
-			entry.peer.NickName,
-			entry.lastSeen})
-	}
-
-	return slice
+		router.Overlay.Diagnostics(),
+		NewTrustedSubnetsSlice(router.TrustedSubnets)}
 }
 
 func NewPeerStatusSlice(peers *Peers) []PeerStatus {
@@ -176,7 +149,14 @@ func NewLocalConnectionStatusSlice(cm *ConnectionMaker) []LocalConnectionStatus
 				state = "established"
 			}
 			lc, _ := conn.(*LocalConnection)
-			info := fmt.Sprintf("%-6v %v", lc.forwarder.DisplayName(), conn.Remote())
+			info := fmt.Sprintf("%-6v %v", lc.OverlayConn.DisplayName(), conn.Remote())
+			if lc.Router.UsingPassword() {
+				if lc.Untrusted() {
+					info = fmt.Sprintf("%-11v %v", "encrypted", info)
+				} else {
+					info = fmt.Sprintf("%-11v %v", "unencrypted", info)
+				}
+			}
 			slice = append(slice, LocalConnectionStatus{conn.RemoteTCPAddr(), conn.Outbound(), state, info})
 		}
 		for address, target := range cm.targets {
@@ -221,3 +201,11 @@ func NewTargetSlice(cm *ConnectionMaker) []string {
 	}
 	return <-resultChan
 }
+
+func NewTrustedSubnetsSlice(trustedSubnets []*net.IPNet) []string {
+	trustedSubnetStrs := []string{}
+	for _, trustedSubnet := range trustedSubnets {
+		trustedSubnetStrs = append(trustedSubnetStrs, trustedSubnet.String())
+	}
+	return trustedSubnetStrs
+}

mesh/surrogate_gossiper.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 type SurrogateGossipData struct {
 	messages [][]byte
@@ -12,8 +12,12 @@ func (d *SurrogateGossipData) Encode() [][]byte {
 	return d.messages
 }
 
-func (d *SurrogateGossipData) Merge(other GossipData) {
-	d.messages = append(d.messages, other.(*SurrogateGossipData).messages...)
+func (d *SurrogateGossipData) Merge(other GossipData) GossipData {
+	o := other.(*SurrogateGossipData)
+	messages := make([][]byte, 0, len(d.messages)+len(o.messages))
+	messages = append(messages, d.messages...)
+	messages = append(messages, o.messages...)
+	return &SurrogateGossipData{messages: messages}
 }
 
 // SurrogateGossiper ignores unicasts and relays broadcasts and gossips.

mesh/token_bucket.go

@@ -1,4 +1,4 @@
-package router
+package mesh
 
 import (
 	"time"

nameserver/dns.go

@@ -216,7 +216,7 @@ func (h *handler) handleRecursive(w dns.ResponseWriter, req *dns.Msg) {
 		reqCopy := req.Copy()
 		reqCopy.Id = dns.Id()
 		response, _, err := h.client.Exchange(reqCopy, fmt.Sprintf("%s:%s", server, h.upstream.Port))
-		if err != nil || response == nil {
+		if (err != nil && err != dns.ErrTruncated) || response == nil {
 			h.ns.debugf("error trying %s: %v", server, err)
 			continue
 		}

nameserver/dns_test.go

@@ -11,14 +11,14 @@ import (
 	"github.com/miekg/dns"
 	"github.com/stretchr/testify/require"
 
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
 func startServer(t *testing.T, upstream *dns.ClientConfig) (*DNSServer, *Nameserver, int, int) {
-	peername, err := router.PeerNameFromString("00:00:00:02:00:00")
+	peername, err := mesh.PeerNameFromString("00:00:00:02:00:00")
 	require.Nil(t, err)
-	nameserver := New(peername, nil, "")
+	nameserver := New(peername, "", func(mesh.PeerName) bool { return true })
 	dnsserver, err := NewDNSServer(nameserver, "weave.local.", "0.0.0.0:0", "", 30, 5*time.Second)
 	require.Nil(t, err)
 	udpPort := dnsserver.servers[0].PacketConn.LocalAddr().(*net.UDPAddr).Port
@@ -39,20 +39,20 @@ func TestTruncation(t *testing.T) {
 	addrs := []address.Address{}
 	for i := address.Address(0); i < 100; i++ {
 		addrs = append(addrs, i)
-		nameserver.AddEntry("foo.weave.local.", "", router.UnknownPeerName, i)
+		nameserver.AddEntry("foo.weave.local.", "", mesh.UnknownPeerName, i)
 	}
 
-	doRequest := func(client *dns.Client, request *dns.Msg, port int) *dns.Msg {
+	doRequest := func(client *dns.Client, request *dns.Msg, port int, expectedErr error) *dns.Msg {
 		request.SetQuestion("foo.weave.local.", dns.TypeA)
 		response, _, err := client.Exchange(request, fmt.Sprintf("127.0.0.1:%d", port))
-		require.Nil(t, err)
+		require.Equal(t, expectedErr, err)
 		return response
 	}
 
 	// do a udp query, ensure we get a truncated response
 	{
 		udpClient := dns.Client{Net: "udp", UDPSize: minUDPSize}
-		response := doRequest(&udpClient, &dns.Msg{}, udpPort)
+		response := doRequest(&udpClient, &dns.Msg{}, udpPort, dns.ErrTruncated)
 		require.True(t, response.MsgHdr.Truncated)
 		require.True(t, len(response.Answer) < 100)
 	}
@@ -62,7 +62,7 @@ func TestTruncation(t *testing.T) {
 		udpClient := dns.Client{Net: "udp", UDPSize: 65535}
 		request := &dns.Msg{}
 		request.SetEdns0(65535, false)
-		response := doRequest(&udpClient, request, udpPort)
+		response := doRequest(&udpClient, request, udpPort, nil)
 		require.False(t, response.MsgHdr.Truncated)
 		require.Equal(t, len(response.Answer), 100)
 	}
@@ -70,7 +70,7 @@ func TestTruncation(t *testing.T) {
 	// do a tcp query, ensure we don't get a truncated response
 	{
 		tcpClient := dns.Client{Net: "tcp"}
-		response := doRequest(&tcpClient, &dns.Msg{}, tcpPort)
+		response := doRequest(&tcpClient, &dns.Msg{}, tcpPort, nil)
 		require.False(t, response.MsgHdr.Truncated)
 		require.Equal(t, len(response.Answer), 100)
 	}

nameserver/entry.go

@@ -8,17 +8,18 @@ import (
 	"strings"
 	"time"
 
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
 var now = func() int64 { return time.Now().Unix() }
 
 type Entry struct {
 	ContainerID string
-	Origin      router.PeerName
+	Origin      mesh.PeerName
 	Addr        address.Address
-	Hostname    string
+	Hostname    string // as supplied
+	lHostname   string // lowercased (not exported, so not encoded by gob)
 	Version     int
 	Tombstone   int64 // timestamp of when it was deleted
 }
@@ -69,7 +70,7 @@ func (e1 *Entry) less(e2 *Entry) bool {
 
 func (e1 *Entry) insensitiveLess(e2 *Entry) bool {
 	// Entries are kept sorted by Hostname, Origin, ContainerID then address
-	e1Hostname, e2Hostname := strings.ToLower(e1.Hostname), strings.ToLower(e2.Hostname)
+	e1Hostname, e2Hostname := e1.lHostname, e2.lHostname
 	switch {
 	case e1Hostname != e2Hostname:
 		return e1Hostname < e2Hostname
@@ -100,6 +101,10 @@ func (e1 *Entry) String() string {
 	return fmt.Sprintf("%s -> %s", e1.Hostname, e1.Addr.String())
 }
 
+func (e1 *Entry) addLowercase() {
+	e1.lHostname = strings.ToLower(e1.Hostname)
+}
+
 func check(es SortableEntries) error {
 	if !sort.IsSorted(es) {
 		return fmt.Errorf("Not sorted!")
@@ -123,10 +128,11 @@ func (es *Entries) checkAndPanic() *Entries {
 	return es
 }
 
-func (es *Entries) add(hostname, containerid string, origin router.PeerName, addr address.Address) Entry {
+func (es *Entries) add(hostname, containerid string, origin mesh.PeerName, addr address.Address) Entry {
 	defer es.checkAndPanic().checkAndPanic()
 
-	entry := Entry{Hostname: hostname, Origin: origin, ContainerID: containerid, Addr: addr}
+	entry := Entry{Hostname: hostname, lHostname: strings.ToLower(hostname),
+		Origin: origin, ContainerID: containerid, Addr: addr}
 	i := sort.Search(len(*es), func(i int) bool {
 		return !(*es)[i].insensitiveLess(&entry)
 	})
@@ -145,6 +151,7 @@ func (es *Entries) add(hostname, containerid string, origin router.PeerName, add
 
 func (es *Entries) merge(incoming Entries) Entries {
 	defer es.checkAndPanic().checkAndPanic()
+	incoming.checkAndPanic()
 
 	newEntries := Entries{}
 	i := 0
@@ -169,7 +176,7 @@ func (es *Entries) merge(incoming Entries) Entries {
 }
 
 // f returning true means keep the entry.
-func (es *Entries) tombstone(ourname router.PeerName, f func(*Entry) bool) Entries {
+func (es *Entries) tombstone(ourname mesh.PeerName, f func(*Entry) bool) Entries {
 	defer es.checkAndPanic().checkAndPanic()
 
 	tombstoned := Entries{}
@@ -203,23 +210,23 @@ func (es Entries) lookup(hostname string) Entries {
 
 	lowerHostname := strings.ToLower(hostname)
 	i := sort.Search(len(es), func(i int) bool {
-		return strings.ToLower(es[i].Hostname) >= lowerHostname
+		return es[i].lHostname >= lowerHostname
 	})
-	if i >= len(es) || strings.ToLower(es[i].Hostname) != lowerHostname {
+	if i >= len(es) || es[i].lHostname != lowerHostname {
 		return Entries{}
 	}
 
 	j := sort.Search(len(es)-i, func(j int) bool {
-		return strings.ToLower(es[i+j].Hostname) > lowerHostname
+		return es[i+j].lHostname > lowerHostname
 	})
 
 	return es[i : i+j]
 }
 
-func (es *Entries) first(f func(*Entry) bool) (*Entry, error) {
+func (es Entries) first(f func(*Entry) bool) (*Entry, error) {
 	es.checkAndPanic()
 
-	for _, e := range *es {
+	for _, e := range es {
 		if f(&e) {
 			return &e, nil
 		}
@@ -227,26 +234,49 @@ func (es *Entries) first(f func(*Entry) bool) (*Entry, error) {
 	return nil, fmt.Errorf("Not found")
 }
 
+func (es Entries) addLowercase() {
+	for i := range es {
+		es[i].addLowercase()
+	}
+}
+
 type GossipData struct {
 	Timestamp int64
 	Entries
 }
 
-func (g *GossipData) Merge(o router.GossipData) {
-	checkAndPanic(CaseSensitive(g.Entries))
-	defer func() { checkAndPanic(CaseSensitive(g.Entries)) }()
+func (g *GossipData) Merge(o mesh.GossipData) mesh.GossipData {
 	other := o.(*GossipData)
-	g.Entries.merge(other.Entries)
-	if g.Timestamp < other.Timestamp {
-		g.Timestamp = other.Timestamp
+	gossip := g.copy()
+	gossip.Entries.merge(other.Entries)
+	if gossip.Timestamp < other.Timestamp {
+		gossip.Timestamp = other.Timestamp
 	}
+	return gossip
+}
+
+func (g *GossipData) Decode(msg []byte) error {
+	if err := gob.NewDecoder(bytes.NewReader(msg)).Decode(g); err != nil {
+		return err
+	}
+
+	g.Entries.addLowercase() // lowercase strings not sent on the wire
+	sort.Sort(CaseInsensitive(g.Entries))
+	return nil
 }
 
 func (g *GossipData) Encode() [][]byte {
-	checkAndPanic(CaseSensitive(g.Entries))
+	g2 := g.copy()
+	sort.Sort(CaseSensitive(g2.Entries))
 	buf := &bytes.Buffer{}
-	if err := gob.NewEncoder(buf).Encode(g); err != nil {
+	if err := gob.NewEncoder(buf).Encode(g2); err != nil {
 		panic(err)
 	}
 	return [][]byte{buf.Bytes()}
 }
+
+func (g *GossipData) copy() *GossipData {
+	g2 := &GossipData{Timestamp: g.Timestamp, Entries: make(Entries, len(g.Entries))}
+	copy(g2.Entries, g.Entries)
+	return g2
+}

nameserver/entry_test.go

@@ -5,79 +5,70 @@ import (
 
 	"github.com/stretchr/testify/require"
 
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
+func l(es Entries) Entries {
+	es.addLowercase()
+	return es
+}
+
+func makeEntries(values string) Entries {
+	entries := make(Entries, len(values))
+	for i, c := range values {
+		entries[i] = Entry{Hostname: string(c)}
+	}
+	return l(entries)
+}
+
 func TestAdd(t *testing.T) {
 	oldNow := now
 	defer func() { now = oldNow }()
 	now = func() int64 { return 1234 }
 
 	entries := Entries{}
-	entries.add("A", "", router.UnknownPeerName, address.Address(0))
-	expected := Entries{
-		Entry{Hostname: "A", Origin: router.UnknownPeerName, Addr: address.Address(0)},
-	}
+	entries.add("A", "", mesh.UnknownPeerName, address.Address(0))
+	expected := l(Entries{
+		Entry{Hostname: "A", Origin: mesh.UnknownPeerName, Addr: address.Address(0)},
+	})
 	require.Equal(t, entries, expected)
 
-	entries.tombstone(router.UnknownPeerName, func(e *Entry) bool { return e.Hostname == "A" })
-	expected = Entries{
-		Entry{Hostname: "A", Origin: router.UnknownPeerName, Addr: address.Address(0), Version: 1, Tombstone: 1234},
-	}
+	entries.tombstone(mesh.UnknownPeerName, func(e *Entry) bool { return e.Hostname == "A" })
+	expected = l(Entries{
+		Entry{Hostname: "A", Origin: mesh.UnknownPeerName, Addr: address.Address(0), Version: 1, Tombstone: 1234},
+	})
 	require.Equal(t, entries, expected)
 
-	entries.add("A", "", router.UnknownPeerName, address.Address(0))
-	expected = Entries{
-		Entry{Hostname: "A", Origin: router.UnknownPeerName, Addr: address.Address(0), Version: 2},
-	}
+	entries.add("A", "", mesh.UnknownPeerName, address.Address(0))
+	expected = l(Entries{
+		Entry{Hostname: "A", Origin: mesh.UnknownPeerName, Addr: address.Address(0), Version: 2},
+	})
 	require.Equal(t, entries, expected)
 }
 
 func TestMerge(t *testing.T) {
-	e1 := Entries{
-		Entry{Hostname: "A"},
-		Entry{Hostname: "C"},
-		Entry{Hostname: "D"},
-		Entry{Hostname: "F"},
-	}
-
-	e2 := Entries{
-		Entry{Hostname: "B"},
-		Entry{Hostname: "E"},
-		Entry{Hostname: "F"},
-	}
+	e1 := makeEntries("ACDF")
+	e2 := makeEntries("BEF")
 
 	diff := e1.merge(e2)
-	expectedDiff := Entries{
-		Entry{Hostname: "B"},
-		Entry{Hostname: "E"},
-	}
-	require.Equal(t, expectedDiff, diff)
 
-	expected := Entries{
-		Entry{Hostname: "A"},
-		Entry{Hostname: "B"},
-		Entry{Hostname: "C"},
-		Entry{Hostname: "D"},
-		Entry{Hostname: "E"},
-		Entry{Hostname: "F"},
-	}
-	require.Equal(t, expected, e1)
+	require.Equal(t, makeEntries("BE"), diff)
+	require.Equal(t, makeEntries("ABCDEF"), e1)
 
 	diff = e1.merge(e1)
 	require.Equal(t, Entries{}, diff)
 }
 
 func TestOldMerge(t *testing.T) {
-	e1 := Entries{Entry{Hostname: "A", Version: 0}}
-	diff := e1.merge(Entries{Entry{Hostname: "A", Version: 1}})
-	require.Equal(t, Entries{Entry{Hostname: "A", Version: 1}}, diff)
-	require.Equal(t, Entries{Entry{Hostname: "A", Version: 1}}, e1)
+	e1 := l(Entries{Entry{Hostname: "A", Version: 0}})
+	diff := e1.merge(l(Entries{Entry{Hostname: "A", Version: 1}}))
+	require.Equal(t, l(Entries{Entry{Hostname: "A", Version: 1}}), diff)
+	require.Equal(t, l(Entries{Entry{Hostname: "A", Version: 1}}), e1)
 
-	diff = e1.merge(Entries{Entry{Hostname: "A", Version: 0}})
+	diff = e1.merge(l(Entries{Entry{Hostname: "A", Version: 0}}))
 	require.Equal(t, Entries{}, diff)
-	require.Equal(t, Entries{Entry{Hostname: "A", Version: 1}}, e1)
+	require.Equal(t, l(Entries{Entry{Hostname: "A", Version: 1}}), e1)
 }
 
 func TestTombstone(t *testing.T) {
@@ -85,48 +76,48 @@ func TestTombstone(t *testing.T) {
 	defer func() { now = oldNow }()
 	now = func() int64 { return 1234 }
 
-	es := Entries{
-		Entry{Hostname: "A"},
-		Entry{Hostname: "B"},
-	}
+	es := makeEntries("AB")
 
-	es.tombstone(router.UnknownPeerName, func(e *Entry) bool {
+	es.tombstone(mesh.UnknownPeerName, func(e *Entry) bool {
 		return e.Hostname == "B"
 	})
-	expected := Entries{
+	expected := l(Entries{
 		Entry{Hostname: "A"},
 		Entry{Hostname: "B", Version: 1, Tombstone: 1234},
-	}
+	})
 	require.Equal(t, expected, es)
 }
 
 func TestDelete(t *testing.T) {
-	es := Entries{
-		Entry{Hostname: "A"},
-		Entry{Hostname: "B"},
-	}
+	es := makeEntries("AB")
 
 	es.filter(func(e *Entry) bool {
 		return e.Hostname != "A"
 	})
-	expected := Entries{
-		Entry{Hostname: "B"},
-	}
-	require.Equal(t, expected, es)
+	require.Equal(t, makeEntries("B"), es)
 }
 
 func TestLookup(t *testing.T) {
-	es := Entries{
+	es := l(Entries{
 		Entry{Hostname: "A"},
 		Entry{Hostname: "B", ContainerID: "bar"},
 		Entry{Hostname: "B", ContainerID: "foo"},
 		Entry{Hostname: "C"},
-	}
+	})
 
 	have := es.lookup("B")
-	want := Entries{
+	want := l(Entries{
 		Entry{Hostname: "B", ContainerID: "bar"},
 		Entry{Hostname: "B", ContainerID: "foo"},
-	}
+	})
 	require.Equal(t, have, want)
 }
+
+func TestGossipDataMerge(t *testing.T) {
+	g1 := GossipData{Entries: makeEntries("AcDf")}
+	g2 := GossipData{Entries: makeEntries("BEf")}
+
+	g3 := g1.Merge(&g2).(*GossipData)
+
+	require.Equal(t, GossipData{Entries: makeEntries("ABcDEf")}, *g3)
+}

nameserver/http.go

@@ -35,6 +35,11 @@ func (n *Nameserver) HandleHTTP(router *mux.Router, dockerCli *docker.Client) {
 			return
 		}
 
+		if !dns.IsSubDomain(n.domain, hostname) {
+			n.infof("Ignoring registration %s %s %s (not a subdomain of %s)", hostname, ipStr, container, n.domain)
+			return
+		}
+
 		if err := n.AddEntry(hostname, container, n.ourName, ip); err != nil {
 			n.badRequest(w, fmt.Errorf("Unable to add entry: %v", err))
 			return

nameserver/nameserver.go

@@ -1,18 +1,15 @@
 package nameserver
 
 import (
-	"bytes"
-	"encoding/gob"
 	"fmt"
-	"sort"
 	"sync"
 	"time"
 
 	"github.com/miekg/dns"
 
 	. "github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
 )
 
 const (
@@ -37,28 +34,24 @@ const (
 // - Update is O(n) for now
 type Nameserver struct {
 	sync.RWMutex
-	ourName router.PeerName
-	domain  string
-	gossip  router.Gossip
-	entries Entries
-	peers   *router.Peers
-	quit    chan struct{}
+	ourName     mesh.PeerName
+	domain      string
+	gossip      mesh.Gossip
+	entries     Entries
+	isKnownPeer func(mesh.PeerName) bool
+	quit        chan struct{}
 }
 
-func New(ourName router.PeerName, peers *router.Peers, domain string) *Nameserver {
-	ns := &Nameserver{
-		ourName: ourName,
-		domain:  dns.Fqdn(domain),
-		peers:   peers,
-		quit:    make(chan struct{}),
+func New(ourName mesh.PeerName, domain string, isKnownPeer func(mesh.PeerName) bool) *Nameserver {
+	return &Nameserver{
+		ourName:     ourName,
+		domain:      dns.Fqdn(domain),
+		isKnownPeer: isKnownPeer,
+		quit:        make(chan struct{}),
 	}
-	if peers != nil {
-		peers.OnGC(ns.PeerGone)
-	}
-	return ns
 }
 
-func (n *Nameserver) SetGossip(gossip router.Gossip) {
+func (n *Nameserver) SetGossip(gossip mesh.Gossip) {
 	n.gossip = gossip
 }
 
@@ -81,16 +74,16 @@ func (n *Nameserver) Stop() {
 }
 
 func (n *Nameserver) broadcastEntries(es ...Entry) error {
-	if n.gossip != nil {
-		return n.gossip.GossipBroadcast(&GossipData{
-			Entries:   Entries(es),
-			Timestamp: now(),
-		})
+	if n.gossip == nil || len(es) == 0 {
+		return nil
 	}
-	return nil
+	return n.gossip.GossipBroadcast(&GossipData{
+		Entries:   Entries(es),
+		Timestamp: now(),
+	})
 }
 
-func (n *Nameserver) AddEntry(hostname, containerid string, origin router.PeerName, addr address.Address) error {
+func (n *Nameserver) AddEntry(hostname, containerid string, origin mesh.PeerName, addr address.Address) error {
 	n.infof("adding entry %s -> %s", hostname, addr.String())
 	n.Lock()
 	entry := n.entries.add(hostname, containerid, origin, addr)
@@ -140,19 +133,17 @@ func (n *Nameserver) ContainerDied(ident string) {
 		return false
 	})
 	n.Unlock()
-	if len(entries) > 0 {
-		if err := n.broadcastEntries(entries...); err != nil {
-			n.errorf("failed to broadcast container %s death: %v", ident, err)
-		}
+	if err := n.broadcastEntries(entries...); err != nil {
+		n.errorf("failed to broadcast container %s death: %v", ident, err)
 	}
 }
 
-func (n *Nameserver) PeerGone(peer *router.Peer) {
+func (n *Nameserver) PeerGone(peer mesh.PeerName) {
 	n.infof("peer %s gone", peer.String())
 	n.Lock()
 	defer n.Unlock()
 	n.entries.filter(func(e *Entry) bool {
-		return e.Origin != peer.Name
+		return e.Origin != peer
 	})
 }
 
@@ -188,7 +179,7 @@ func (n *Nameserver) deleteTombstones() {
 	})
 }
 
-func (n *Nameserver) Gossip() router.GossipData {
+func (n *Nameserver) Gossip() mesh.GossipData {
 	n.RLock()
 	defer n.RUnlock()
 	gossip := &GossipData{
@@ -196,34 +187,28 @@ func (n *Nameserver) Gossip() router.GossipData {
 		Timestamp: now(),
 	}
 	copy(gossip.Entries, n.entries)
-	sort.Sort(CaseSensitive(gossip.Entries))
 	return gossip
 }
 
-func (n *Nameserver) OnGossipUnicast(sender router.PeerName, msg []byte) error {
+func (n *Nameserver) OnGossipUnicast(sender mesh.PeerName, msg []byte) error {
 	return nil
 }
 
-func (n *Nameserver) receiveGossip(msg []byte) (router.GossipData, router.GossipData, error) {
+func (n *Nameserver) receiveGossip(msg []byte) (mesh.GossipData, mesh.GossipData, error) {
 	var gossip GossipData
-	if err := gob.NewDecoder(bytes.NewReader(msg)).Decode(&gossip); err != nil {
+	if err := gossip.Decode(msg); err != nil {
 		return nil, nil, err
 	}
-
 	if delta := gossip.Timestamp - now(); delta > gossipWindow || delta < -gossipWindow {
 		return nil, nil, fmt.Errorf("clock skew of %d detected", delta)
 	}
 
-	sort.Sort(CaseInsensitive(gossip.Entries))
-
 	n.Lock()
 	defer n.Unlock()
 
-	if n.peers != nil {
-		gossip.Entries.filter(func(e *Entry) bool {
-			return n.peers.Fetch(e.Origin) != nil
-		})
-	}
+	gossip.Entries.filter(func(e *Entry) bool {
+		return n.isKnownPeer(e.Origin)
+	})
 
 	newEntries := n.entries.merge(gossip.Entries)
 	if len(newEntries) > 0 {
@@ -234,14 +219,14 @@ func (n *Nameserver) receiveGossip(msg []byte) (router.GossipData, router.Gossip
 
 // merge received data into state and return "everything new I've
 // just learnt", or nil if nothing in the received data was new
-func (n *Nameserver) OnGossip(msg []byte) (router.GossipData, error) {
+func (n *Nameserver) OnGossip(msg []byte) (mesh.GossipData, error) {
 	newEntries, _, err := n.receiveGossip(msg)
 	return newEntries, err
 }
 
 // merge received data into state and return a representation of
 // the received data, for further propagation
-func (n *Nameserver) OnGossipBroadcast(_ router.PeerName, msg []byte) (router.GossipData, error) {
+func (n *Nameserver) OnGossipBroadcast(_ mesh.PeerName, msg []byte) (mesh.GossipData, error) {
 	_, entries, err := n.receiveGossip(msg)
 	return entries, err
 }

nameserver/nameserver_test.go

@@ -11,19 +11,22 @@ import (
 
 	"github.com/stretchr/testify/require"
 
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/net/address"
-	"github.com/weaveworks/weave/router"
-	wt "github.com/weaveworks/weave/testing"
 	"github.com/weaveworks/weave/testing/gossip"
 )
 
+func makeNameserver(name mesh.PeerName) *Nameserver {
+	return New(name, "", func(mesh.PeerName) bool { return true })
+}
+
 func makeNetwork(size int) ([]*Nameserver, *gossip.TestRouter) {
 	gossipRouter := gossip.NewTestRouter(0.0)
 	nameservers := make([]*Nameserver, size)
 
 	for i := 0; i < size; i++ {
-		name, _ := router.PeerNameFromString(fmt.Sprintf("%02d:00:00:02:00:00", i))
-		nameserver := New(name, nil, "")
+		name, _ := mesh.PeerNameFromString(fmt.Sprintf("%02d:00:00:02:00:00", i))
+		nameserver := makeNameserver(name)
 		nameserver.SetGossip(gossipRouter.Connect(nameserver.ourName, nameserver))
 		nameserver.Start()
 		nameservers[i] = nameserver
@@ -40,7 +43,7 @@ func stopNetwork(nameservers []*Nameserver, grouter *gossip.TestRouter) {
 }
 
 type pair struct {
-	origin router.PeerName
+	origin mesh.PeerName
 	addr   address.Address
 }
 
@@ -72,18 +75,16 @@ func (m mapping) Addrs() []address.Address {
 }
 
 func TestNameservers(t *testing.T) {
-	wt.RunWithTimeout(t, time.Minute, func() {
-		testNameservers(t)
-	})
-}
-
-func testNameservers(t *testing.T) {
 	//common.SetLogLevel("debug")
 
 	lookupTimeout := 10 // ms
-	nameservers, grouter := makeNetwork(50)
+	nameservers, grouter := makeNetwork(30)
 	defer stopNetwork(nameservers, grouter)
-	nameserversByName := map[router.PeerName]*Nameserver{}
+	// This subset will sometimes lose touch with some of the others
+	badNameservers := nameservers[25:]
+	// This subset will remain well-connected, and we will deal mainly with them
+	nameservers = nameservers[:25]
+	nameserversByName := map[mesh.PeerName]*Nameserver{}
 	for _, n := range nameservers {
 		nameserversByName[n.ourName] = n
 	}
@@ -106,7 +107,13 @@ func testNameservers(t *testing.T) {
 	addMapping := func() {
 		nameserver := nameservers[rand.Intn(len(nameservers))]
 		addr := address.Address(rand.Int31())
-		hostname := fmt.Sprintf("hostname%d", rand.Int63())
+		// Create a hostname which has some upper and lowercase letters,
+		// and a unique number so we don't have to check if we allocated it already
+		randomBits := rand.Int63()
+		firstLetter := 'H' + (randomBits&1)*32
+		secondLetter := 'O' + (randomBits&2)*16
+		randomBits = randomBits >> 2
+		hostname := fmt.Sprintf("%c%cstname%d", firstLetter, secondLetter, randomBits)
 		mapping := mapping{hostname, []pair{{nameserver.ourName, addr}}}
 		mappings = append(mappings, mapping)
 
@@ -129,6 +136,12 @@ func testNameservers(t *testing.T) {
 		check(nameserver, mapping)
 	}
 
+	loseConnection := func() {
+		nameserver1 := badNameservers[rand.Intn(len(badNameservers))]
+		nameserver2 := nameservers[rand.Intn(len(nameservers))]
+		nameserver1.PeerGone(nameserver2.ourName)
+	}
+
 	deleteMapping := func() {
 		if len(mappings) <= 0 {
 			return
@@ -179,7 +192,7 @@ func testNameservers(t *testing.T) {
 		require.Equal(t, mapping.hostname, hostname)
 	}
 
-	for i := 0; i < 1000; i++ {
+	for i := 0; i < 800; i++ {
 		r := rand.Float32()
 		switch {
 		case r < 0.1:
@@ -191,7 +204,10 @@ func testNameservers(t *testing.T) {
 		case 0.2 <= r && r < 0.3:
 			deleteMapping()
 
-		case 0.3 <= r && r < 0.9:
+		case 0.3 <= r && r < 0.35:
+			loseConnection()
+
+		case 0.35 <= r && r < 0.9:
 			doLookup()
 
 		case 0.9 <= r:
@@ -203,9 +219,9 @@ func testNameservers(t *testing.T) {
 }
 
 func TestContainerAndPeerDeath(t *testing.T) {
-	peername, err := router.PeerNameFromString("00:00:00:02:00:00")
+	peername, err := mesh.PeerNameFromString("00:00:00:02:00:00")
 	require.Nil(t, err)
-	nameserver := New(peername, nil, "")
+	nameserver := makeNameserver(peername)
 
 	err = nameserver.AddEntry("hostname", "containerid", peername, address.Address(0))
 	require.Nil(t, err)
@@ -218,7 +234,7 @@ func TestContainerAndPeerDeath(t *testing.T) {
 	require.Nil(t, err)
 	require.Equal(t, []address.Address{0}, nameserver.Lookup("hostname"))
 
-	nameserver.PeerGone(&router.Peer{Name: peername})
+	nameserver.PeerGone(peername)
 	require.Equal(t, []address.Address{}, nameserver.Lookup("hostname"))
 }
 
@@ -227,9 +243,9 @@ func TestTombstoneDeletion(t *testing.T) {
 	defer func() { now = oldNow }()
 	now = func() int64 { return 1234 }
 
-	peername, err := router.PeerNameFromString("00:00:00:02:00:00")
+	peername, err := mesh.PeerNameFromString("00:00:00:02:00:00")
 	require.Nil(t, err)
-	nameserver := New(peername, nil, "")
+	nameserver := makeNameserver(peername)
 
 	err = nameserver.AddEntry("hostname", "containerid", peername, address.Address(0))
 	require.Nil(t, err)
@@ -241,14 +257,14 @@ func TestTombstoneDeletion(t *testing.T) {
 	err = nameserver.Delete("hostname", "containerid", "", address.Address(0))
 	require.Nil(t, err)
 	require.Equal(t, []address.Address{}, nameserver.Lookup("hostname"))
-	require.Equal(t, Entries{{
+	require.Equal(t, l(Entries{Entry{
 		ContainerID: "containerid",
 		Origin:      peername,
 		Addr:        address.Address(0),
 		Hostname:    "hostname",
 		Version:     1,
 		Tombstone:   1234,
-	}}, nameserver.entries)
+	}}), nameserver.entries)
 
 	now = func() int64 { return 1234 + int64(tombstoneTimeout/time.Second) + 1 }
 	nameserver.deleteTombstones()

nameserver/status.go

@@ -1,10 +1,11 @@
 package nameserver
 
 type Status struct {
-	Domain  string
-	Address string
-	TTL     uint32
-	Entries []EntryStatus
+	Domain   string
+	Upstream []string
+	Address  string
+	TTL      uint32
+	Entries  []EntryStatus
 }
 
 type EntryStatus struct {
@@ -37,6 +38,7 @@ func NewStatus(ns *Nameserver, dnsServer *DNSServer) *Status {
 
 	return &Status{
 		dnsServer.domain,
+		dnsServer.upstream.Servers,
 		dnsServer.address,
 		dnsServer.ttl,
 		entryStatusSlice}

net/address/address.go

@@ -19,7 +19,7 @@ func NewRange(start Address, size Offset) Range {
 	return Range{Start: start, End: Add(start, size)}
 }
 func (r Range) Size() Offset               { return Subtract(r.End, r.Start) }
-func (r Range) String() string             { return fmt.Sprintf("[%s-%s)", r.Start, r.End) }
+func (r Range) String() string             { return fmt.Sprintf("%s-%s", r.Start, r.End-1) }
 func (r Range) Overlaps(or Range) bool     { return !(r.Start >= or.End || r.End <= or.Start) }
 func (r Range) Contains(addr Address) bool { return addr >= r.Start && addr < r.End }
 

net/if.go

@@ -5,28 +5,34 @@ import (
 	"net"
 	"syscall"
 
-	"github.com/vishvananda/netlink/nl"
+	"github.com/vishvananda/netlink"
 )
 
 // Wait for an interface to come up.
 func EnsureInterface(ifaceName string) (*net.Interface, error) {
-	s, err := nl.Subscribe(syscall.NETLINK_ROUTE, syscall.RTNLGRP_LINK)
-	if err != nil {
-		return nil, err
-	}
-	defer s.Close()
-	iface, err := ensureInterface(s, ifaceName)
+	iface, err := ensureInterface(ifaceName)
 	if err != nil {
 		return nil, err
 	}
 	return iface, err
 }
 
-func ensureInterface(s *nl.NetlinkSocket, ifaceName string) (*net.Interface, error) {
+func ensureInterface(ifaceName string) (*net.Interface, error) {
+	ch := make(chan netlink.LinkUpdate)
+	done := make(chan struct{})
+	defer close(done)
+	if err := netlink.LinkSubscribe(ch, done); err != nil {
+		return nil, err
+	}
+	// check for currently-existing interface after subscribing, to avoid race
 	if iface, err := findInterface(ifaceName); err == nil {
 		return iface, nil
 	}
-	netlinkReceiveUntil(s, matchIfName(ifaceName))
+	for update := range ch {
+		if ifaceName == update.Link.Attrs().Name && update.IfInfomsg.Flags&syscall.IFF_UP != 0 {
+			break
+		}
+	}
 	iface, err := findInterface(ifaceName)
 	return iface, err
 }
@@ -35,21 +41,28 @@ func ensureInterface(s *nl.NetlinkSocket, ifaceName string) (*net.Interface, err
 // This matches the behaviour in 'weave attach', which is the only context in which
 // we expect this to be called.  If you change one, change the other to match.
 func EnsureInterfaceAndMcastRoute(ifaceName string) (*net.Interface, error) {
-	s, err := nl.Subscribe(syscall.NETLINK_ROUTE, syscall.RTNLGRP_LINK, syscall.RTNLGRP_IPV4_ROUTE)
+	iface, err := ensureInterface(ifaceName)
 	if err != nil {
 		return nil, err
 	}
-	defer s.Close()
-	iface, err := ensureInterface(s, ifaceName)
-	if err != nil {
+	ch := make(chan netlink.RouteUpdate)
+	done := make(chan struct{})
+	defer close(done)
+	if err := netlink.RouteSubscribe(ch, done); err != nil {
 		return nil, err
 	}
 	dest := net.IPv4(224, 0, 0, 0)
+	// check for currently-existing route after subscribing, to avoid race
 	if CheckRouteExists(ifaceName, dest) {
 		return iface, err
 	}
-	netlinkReceiveUntil(s, matchRoute(ifaceName, dest))
-	return iface, err
+	for update := range ch {
+		link, _ := netlink.LinkByIndex(update.Route.LinkIndex)
+		if link.Attrs().Name == ifaceName && update.Route.Dst.IP.Equal(dest) {
+			break
+		}
+	}
+	return iface, nil
 }
 
 func findInterface(ifaceName string) (iface *net.Interface, err error) {
@@ -61,40 +74,3 @@ func findInterface(ifaceName string) (iface *net.Interface, err error) {
 	}
 	return
 }
-
-func netlinkReceiveUntil(s *nl.NetlinkSocket, f func(syscall.NetlinkMessage) (bool, error)) error {
-	for {
-		msgs, err := s.Receive()
-		if err != nil {
-			return err
-		}
-		for _, m := range msgs {
-			if done, err := f(m); done {
-				return err
-			}
-		}
-	}
-}
-
-func matchIfName(ifaceName string) func(m syscall.NetlinkMessage) (bool, error) {
-	return func(m syscall.NetlinkMessage) (bool, error) {
-		switch m.Header.Type {
-		case syscall.RTM_NEWLINK: // receive this type for link 'up'
-			ifmsg := nl.DeserializeIfInfomsg(m.Data)
-			attrs, err := syscall.ParseNetlinkRouteAttr(&m)
-			if err != nil {
-				return true, err
-			}
-			name := ""
-			for _, attr := range attrs {
-				if attr.Attr.Type == syscall.IFA_LABEL {
-					name = string(attr.Value[:len(attr.Value)-1])
-				}
-			}
-			if ifaceName == name && ifmsg.Flags&syscall.IFF_UP != 0 {
-				return true, nil
-			}
-		}
-		return false, nil
-	}
-}

net/route.go

@@ -3,10 +3,8 @@ package net
 import (
 	"fmt"
 	"net"
-	"syscall"
 
 	"github.com/vishvananda/netlink"
-	"github.com/vishvananda/netlink/nl"
 )
 
 // A network is considered free if it does not overlap any existing
@@ -65,51 +63,3 @@ func CheckRouteExists(ifaceName string, dest net.IP) bool {
 	})
 	return found
 }
-
-func matchRoute(ifaceName string, dest net.IP) func(m syscall.NetlinkMessage) (bool, error) {
-	return func(m syscall.NetlinkMessage) (bool, error) {
-		switch m.Header.Type {
-		case syscall.RTM_NEWROUTE:
-			route, err := deserializeRoute(m.Data)
-			if err != nil {
-				return true, err
-			}
-			link, _ := netlink.LinkByIndex(route.LinkIndex)
-			if link.Attrs().Name == ifaceName && route.Dst.IP.Equal(dest) {
-				return true, nil
-			}
-		}
-		return false, nil
-	}
-}
-
-// This code proposed for addition to the vishvananda/netlink library
-// deserializeRoute decodes a binary netlink message into a Route struct
-func deserializeRoute(m []byte) (netlink.Route, error) {
-	route := netlink.Route{}
-	msg := nl.DeserializeRtMsg(m)
-	attrs, err := nl.ParseRouteAttr(m[msg.Len():])
-	if err != nil {
-		return route, err
-	}
-	route.Scope = netlink.Scope(msg.Scope)
-
-	native := nl.NativeEndian()
-	for _, attr := range attrs {
-		switch attr.Attr.Type {
-		case syscall.RTA_GATEWAY:
-			route.Gw = net.IP(attr.Value)
-		case syscall.RTA_PREFSRC:
-			route.Src = net.IP(attr.Value)
-		case syscall.RTA_DST:
-			route.Dst = &net.IPNet{
-				IP:   attr.Value,
-				Mask: net.CIDRMask(int(msg.Dst_len), 8*len(attr.Value)),
-			}
-		case syscall.RTA_OIF:
-			routeIndex := int(native.Uint32(attr.Value[0:4]))
-			route.LinkIndex = routeIndex
-		}
-	}
-	return route, nil
-}

plugin/README.md

@@ -0,0 +1,9 @@
+# Weave network driver extension for Docker
+
+A [plugin](http://docs.docker.com/engine/extend/plugin_api/) to
+integrate [weave Net](http://weave.works/net/) with Docker.
+
+The plugin runs automatically when you `weave launch`, provided your
+Docker daemon is version 1.9 or newer.
+
+More detail [here](http://docs.weave.works/weave/latest_release/plugin.html).

plugin/ipam/driver.go

@@ -0,0 +1,58 @@
+package ipamplugin
+
+import (
+	"net"
+
+	"github.com/docker/libnetwork/ipamapi"
+	"github.com/docker/libnetwork/netlabel"
+	"github.com/weaveworks/weave/api"
+	. "github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/common/docker"
+)
+
+const (
+	WeaveContainer = "weave"
+)
+
+type ipam struct {
+	client *docker.Client
+	weave  *api.Client
+}
+
+func NewIpam(client *docker.Client, version string) (ipamapi.Ipam, error) {
+	resolver := func() (string, error) { return client.GetContainerIP(WeaveContainer) }
+	return &ipam{client: client, weave: api.NewClientWithResolver(resolver)}, nil
+}
+
+func (i *ipam) GetDefaultAddressSpaces() (string, string, error) {
+	Log.Debugln("GetDefaultAddressSpaces")
+	return "weavelocal", "weaveglobal", nil
+}
+
+func (i *ipam) RequestPool(addressSpace, pool, subPool string, options map[string]string, v6 bool) (string, *net.IPNet, map[string]string, error) {
+	Log.Debugln("RequestPool", addressSpace, pool, subPool, options)
+	cidr, err := i.weave.DefaultSubnet()
+	Log.Debugln("RequestPool returning ", cidr, err)
+	// Pass back a fake "gateway address"; we don't actually use it,
+	// so just give the network address.
+	data := map[string]string{netlabel.Gateway: cidr.String()}
+	return "weavepool", cidr, data, err
+}
+
+func (i *ipam) ReleasePool(poolID string) error {
+	Log.Debugln("ReleasePool", poolID)
+	return nil
+}
+
+func (i *ipam) RequestAddress(poolID string, address net.IP, options map[string]string) (*net.IPNet, map[string]string, error) {
+	Log.Debugln("RequestAddress", poolID, address, options)
+	// Pass magic string to weave IPAM, which then stores the address under its own string
+	ip, err := i.weave.AllocateIP("_")
+	Log.Debugln("allocateIP returned", ip, err)
+	return ip, nil, err
+}
+
+func (i *ipam) ReleaseAddress(poolID string, address net.IP) error {
+	Log.Debugln("ReleaseAddress", poolID, address)
+	return i.weave.ReleaseIP(address.String())
+}

plugin/net/driver.go

@@ -0,0 +1,206 @@
+package plugin
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/docker/libnetwork/drivers/remote/api"
+	"github.com/docker/libnetwork/types"
+
+	. "github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/common/docker"
+	"github.com/weaveworks/weave/common/odp"
+	"github.com/weaveworks/weave/plugin/skel"
+
+	"github.com/vishvananda/netlink"
+)
+
+const (
+	WeaveContainer = "weave"
+	WeaveBridge    = "weave"
+)
+
+type driver struct {
+	version          string
+	nameserver       string
+	scope            string
+	noMulticastRoute bool
+	sync.RWMutex
+	endpoints map[string]struct{}
+}
+
+func New(client *docker.Client, version string, nameserver string, scope string, noMulticastRoute bool) (skel.Driver, error) {
+	driver := &driver{
+		nameserver:       nameserver,
+		noMulticastRoute: noMulticastRoute,
+		version:          version,
+		scope:            scope,
+		endpoints:        make(map[string]struct{}),
+	}
+
+	_, err := NewWatcher(client, driver)
+	if err != nil {
+		return nil, err
+	}
+	return driver, nil
+}
+
+func errorf(format string, a ...interface{}) error {
+	Log.Errorf(format, a...)
+	return fmt.Errorf(format, a...)
+}
+
+// === protocol handlers
+
+func (driver *driver) GetCapabilities() (*api.GetCapabilityResponse, error) {
+	var caps = &api.GetCapabilityResponse{
+		Scope: driver.scope,
+	}
+	Log.Debugf("Get capabilities: responded with %+v", caps)
+	return caps, nil
+}
+
+func (driver *driver) CreateNetwork(create *api.CreateNetworkRequest) error {
+	Log.Debugf("Create network request %+v", create)
+	Log.Infof("Create network %s", create.NetworkID)
+	return nil
+}
+
+func (driver *driver) DeleteNetwork(delete *api.DeleteNetworkRequest) error {
+	Log.Debugf("Delete network request: %+v", delete)
+	Log.Infof("Destroy network %s", delete.NetworkID)
+	return nil
+}
+
+func (driver *driver) CreateEndpoint(create *api.CreateEndpointRequest) (*api.CreateEndpointResponse, error) {
+	Log.Debugf("Create endpoint request %+v", create)
+	endID := create.EndpointID
+
+	if create.Interface == nil {
+		return nil, fmt.Errorf("Not supported: creating an interface from within CreateEndpoint")
+	}
+	driver.Lock()
+	driver.endpoints[endID] = struct{}{}
+	driver.Unlock()
+	resp := &api.CreateEndpointResponse{}
+
+	Log.Infof("Create endpoint %s %+v", endID, resp)
+	return resp, nil
+}
+
+func (driver *driver) DeleteEndpoint(deleteReq *api.DeleteEndpointRequest) error {
+	Log.Debugf("Delete endpoint request: %+v", deleteReq)
+	Log.Infof("Delete endpoint %s", deleteReq.EndpointID)
+	driver.Lock()
+	delete(driver.endpoints, deleteReq.EndpointID)
+	driver.Unlock()
+	return nil
+}
+
+func (driver *driver) HasEndpoint(endpointID string) bool {
+	driver.Lock()
+	_, found := driver.endpoints[endpointID]
+	driver.Unlock()
+	return found
+}
+
+func (driver *driver) EndpointInfo(req *api.EndpointInfoRequest) (*api.EndpointInfoResponse, error) {
+	Log.Debugf("Endpoint info request: %+v", req)
+	Log.Infof("Endpoint info %s", req.EndpointID)
+	return &api.EndpointInfoResponse{Value: map[string]interface{}{}}, nil
+}
+
+func (driver *driver) JoinEndpoint(j *api.JoinRequest) (*api.JoinResponse, error) {
+	endID := j.EndpointID
+
+	maybeBridge, err := netlink.LinkByName(WeaveBridge)
+	if err != nil {
+		return nil, errorf(`bridge "%s" not present; did you launch weave?`, WeaveBridge)
+	}
+
+	// create and attach local name to the bridge
+	local := vethPair(endID[:5])
+	local.Attrs().MTU = maybeBridge.Attrs().MTU
+	if err := netlink.LinkAdd(local); err != nil {
+		return nil, errorf("could not create veth pair: %s", err)
+	}
+
+	switch maybeBridge.(type) {
+	case *netlink.Bridge:
+		if err := netlink.LinkSetMasterByIndex(local, maybeBridge.Attrs().Index); err != nil {
+			return nil, errorf(`unable to set master: %s`, err)
+		}
+	case *netlink.GenericLink:
+		if maybeBridge.Type() != "openvswitch" {
+			Log.Errorf("device %s is %+v", WeaveBridge, maybeBridge)
+			return nil, errorf(`device "%s" is of type "%s"`, WeaveBridge, maybeBridge.Type())
+		}
+		odp.AddDatapathInterface(WeaveBridge, local.Name)
+	case *netlink.Device:
+		Log.Warnf("kernel does not report what kind of device %s is, just %+v", WeaveBridge, maybeBridge)
+		// Assume it's our openvswitch device, and the kernel has not been updated to report the kind.
+		odp.AddDatapathInterface(WeaveBridge, local.Name)
+	default:
+		Log.Errorf("device %s is %+v", WeaveBridge, maybeBridge)
+		return nil, errorf(`device "%s" not a bridge`, WeaveBridge)
+	}
+	if err := netlink.LinkSetUp(local); err != nil {
+		return nil, errorf(`unable to bring veth up: %s`, err)
+	}
+
+	ifname := &api.InterfaceName{
+		SrcName:   local.PeerName,
+		DstPrefix: "ethwe",
+	}
+
+	response := &api.JoinResponse{
+		InterfaceName: ifname,
+	}
+	if driver.nameserver != "" {
+		routeToDNS := api.StaticRoute{
+			Destination: driver.nameserver + "/32",
+			RouteType:   types.CONNECTED,
+			NextHop:     "",
+		}
+		response.StaticRoutes = []api.StaticRoute{routeToDNS}
+	}
+	if !driver.noMulticastRoute {
+		multicastRoute := api.StaticRoute{
+			Destination: "224.0.0.0/4",
+			RouteType:   types.CONNECTED,
+		}
+		response.StaticRoutes = append(response.StaticRoutes, multicastRoute)
+	}
+	Log.Infof("Join endpoint %s:%s to %s", j.NetworkID, j.EndpointID, j.SandboxKey)
+	return response, nil
+}
+
+func (driver *driver) LeaveEndpoint(leave *api.LeaveRequest) error {
+	Log.Debugf("Leave request: %+v", leave)
+
+	local := vethPair(leave.EndpointID[:5])
+	if err := netlink.LinkDel(local); err != nil {
+		Log.Warningf("unable to delete veth on leave: %s", err)
+	}
+	Log.Infof("Leave %s:%s", leave.NetworkID, leave.EndpointID)
+	return nil
+}
+
+func (driver *driver) DiscoverNew(disco *api.DiscoveryNotification) error {
+	Log.Debugf("Dicovery new notification: %+v", disco)
+	return nil
+}
+
+func (driver *driver) DiscoverDelete(disco *api.DiscoveryNotification) error {
+	Log.Debugf("Dicovery delete notification: %+v", disco)
+	return nil
+}
+
+// ===
+
+func vethPair(suffix string) *netlink.Veth {
+	return &netlink.Veth{
+		LinkAttrs: netlink.LinkAttrs{Name: "vethwl" + suffix},
+		PeerName:  "vethwg" + suffix,
+	}
+}

plugin/net/watcher.go

@@ -0,0 +1,57 @@
+package plugin
+
+import (
+	"fmt"
+
+	weaveapi "github.com/weaveworks/weave/api"
+	. "github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/common/docker"
+)
+
+const (
+	WeaveDomain = "weave.local"
+)
+
+type watcher struct {
+	client *docker.Client
+	weave  *weaveapi.Client
+	driver *driver
+}
+
+type Watcher interface {
+}
+
+func NewWatcher(client *docker.Client, driver *driver) (Watcher, error) {
+	resolver := func() (string, error) { return client.GetContainerIP(WeaveContainer) }
+	w := &watcher{client: client, driver: driver,
+		weave: weaveapi.NewClientWithResolver(resolver)}
+	err := client.AddObserver(w)
+	if err != nil {
+		return nil, err
+	}
+
+	return w, nil
+}
+
+func (w *watcher) ContainerStarted(id string) {
+	Log.Debugf("Container started %s", id)
+	info, err := w.client.InspectContainer(id)
+	if err != nil {
+		Log.Warningf("error inspecting container: %s", err)
+		return
+	}
+	// check that it's on our network, via the endpointID
+	for _, net := range info.NetworkSettings.Networks {
+		if w.driver.HasEndpoint(net.EndpointID) {
+			fqdn := fmt.Sprintf("%s.%s", info.Config.Hostname, info.Config.Domainname)
+			if err := w.weave.RegisterWithDNS(id, fqdn, net.IPAddress); err != nil {
+				Log.Warningf("unable to register with weaveDNS: %s", err)
+			}
+		}
+	}
+}
+
+func (w *watcher) ContainerDied(id string) {
+	// don't need to do this as WeaveDNS removes names on container died anyway
+	// (note by the time we get this event we can't see the EndpointID)
+}

plugin/skel/listener.go

@@ -0,0 +1,298 @@
+package skel
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+
+	"github.com/gorilla/mux"
+
+	"github.com/docker/libnetwork/drivers/remote/api"
+	"github.com/docker/libnetwork/ipamapi"
+	iapi "github.com/docker/libnetwork/ipams/remote/api"
+)
+
+const (
+	networkReceiver = "NetworkDriver"
+	ipamReceiver    = ipamapi.PluginEndpointType
+)
+
+type Driver interface {
+	GetCapabilities() (*api.GetCapabilityResponse, error)
+	CreateNetwork(create *api.CreateNetworkRequest) error
+	DeleteNetwork(delete *api.DeleteNetworkRequest) error
+	CreateEndpoint(create *api.CreateEndpointRequest) (*api.CreateEndpointResponse, error)
+	DeleteEndpoint(delete *api.DeleteEndpointRequest) error
+	EndpointInfo(req *api.EndpointInfoRequest) (*api.EndpointInfoResponse, error)
+	JoinEndpoint(j *api.JoinRequest) (response *api.JoinResponse, error error)
+	LeaveEndpoint(leave *api.LeaveRequest) error
+	DiscoverNew(discover *api.DiscoveryNotification) error
+	DiscoverDelete(delete *api.DiscoveryNotification) error
+}
+
+type listener struct {
+	d Driver
+	i ipamapi.Ipam
+}
+
+func Listen(socket net.Listener, driver Driver, ipamDriver ipamapi.Ipam) error {
+	router := mux.NewRouter()
+	router.NotFoundHandler = http.HandlerFunc(notFound)
+
+	listener := &listener{driver, ipamDriver}
+
+	router.Methods("POST").Path("/Plugin.Activate").HandlerFunc(listener.handshake)
+
+	handleMethod := func(receiver, method string, h http.HandlerFunc) {
+		router.Methods("POST").Path(fmt.Sprintf("/%s.%s", receiver, method)).HandlerFunc(h)
+	}
+
+	handleMethod(networkReceiver, "GetCapabilities", listener.getCapabilities)
+
+	if driver != nil {
+		handleMethod(networkReceiver, "CreateNetwork", listener.createNetwork)
+		handleMethod(networkReceiver, "DeleteNetwork", listener.deleteNetwork)
+		handleMethod(networkReceiver, "CreateEndpoint", listener.createEndpoint)
+		handleMethod(networkReceiver, "DeleteEndpoint", listener.deleteEndpoint)
+		handleMethod(networkReceiver, "EndpointOperInfo", listener.infoEndpoint)
+		handleMethod(networkReceiver, "Join", listener.joinEndpoint)
+		handleMethod(networkReceiver, "Leave", listener.leaveEndpoint)
+	}
+
+	if ipamDriver != nil {
+		handleMethod(ipamReceiver, "GetDefaultAddressSpaces", listener.getDefaultAddressSpaces)
+		handleMethod(ipamReceiver, "RequestPool", listener.requestPool)
+		handleMethod(ipamReceiver, "ReleasePool", listener.releasePool)
+		handleMethod(ipamReceiver, "RequestAddress", listener.requestAddress)
+		handleMethod(ipamReceiver, "ReleaseAddress", listener.releaseAddress)
+	}
+
+	return http.Serve(socket, router)
+}
+
+func decode(w http.ResponseWriter, r *http.Request, v interface{}) error {
+	err := json.NewDecoder(r.Body).Decode(v)
+	if err != nil {
+		sendError(w, "Unable to decode JSON payload: "+err.Error(), http.StatusBadRequest)
+	}
+	return err
+}
+
+// === protocol handlers
+
+type handshakeResp struct {
+	Implements []string
+}
+
+func (listener *listener) handshake(w http.ResponseWriter, r *http.Request) {
+	var resp handshakeResp
+	if listener.d != nil {
+		resp.Implements = append(resp.Implements, "NetworkDriver")
+	}
+	if listener.i != nil {
+		resp.Implements = append(resp.Implements, "IpamDriver")
+	}
+	err := json.NewEncoder(w).Encode(&resp)
+	if err != nil {
+		sendError(w, "encode error", http.StatusInternalServerError)
+		return
+	}
+}
+
+func (listener *listener) getCapabilities(w http.ResponseWriter, r *http.Request) {
+	caps, err := listener.d.GetCapabilities()
+	objectOrErrorResponse(w, caps, err)
+}
+
+func (listener *listener) createNetwork(w http.ResponseWriter, r *http.Request) {
+	var create api.CreateNetworkRequest
+	err := json.NewDecoder(r.Body).Decode(&create)
+	if err != nil {
+		sendError(w, "Unable to decode JSON payload: "+err.Error(), http.StatusBadRequest)
+		return
+	}
+	emptyOrErrorResponse(w, listener.d.CreateNetwork(&create))
+}
+
+func (listener *listener) deleteNetwork(w http.ResponseWriter, r *http.Request) {
+	var delete api.DeleteNetworkRequest
+	if err := json.NewDecoder(r.Body).Decode(&delete); err != nil {
+		sendError(w, "Unable to decode JSON payload: "+err.Error(), http.StatusBadRequest)
+		return
+	}
+	emptyOrErrorResponse(w, listener.d.DeleteNetwork(&delete))
+}
+
+func (listener *listener) createEndpoint(w http.ResponseWriter, r *http.Request) {
+	var create api.CreateEndpointRequest
+	if err := json.NewDecoder(r.Body).Decode(&create); err != nil {
+		sendError(w, "unable to decode JSON payload: "+err.Error(), http.StatusBadRequest)
+		return
+	}
+	res, err := listener.d.CreateEndpoint(&create)
+	objectOrErrorResponse(w, res, err)
+}
+
+func (listener *listener) deleteEndpoint(w http.ResponseWriter, r *http.Request) {
+	var delete api.DeleteEndpointRequest
+	if err := json.NewDecoder(r.Body).Decode(&delete); err != nil {
+		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
+		return
+	}
+	emptyOrErrorResponse(w, listener.d.DeleteEndpoint(&delete))
+}
+
+func (listener *listener) infoEndpoint(w http.ResponseWriter, r *http.Request) {
+	var req api.EndpointInfoRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
+		return
+	}
+	info, err := listener.d.EndpointInfo(&req)
+	objectOrErrorResponse(w, info, err)
+}
+
+func (listener *listener) joinEndpoint(w http.ResponseWriter, r *http.Request) {
+	var join api.JoinRequest
+	if err := json.NewDecoder(r.Body).Decode(&join); err != nil {
+		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
+		return
+	}
+	res, err := listener.d.JoinEndpoint(&join)
+	objectOrErrorResponse(w, res, err)
+}
+
+func (listener *listener) leaveEndpoint(w http.ResponseWriter, r *http.Request) {
+	var l api.LeaveRequest
+	if err := json.NewDecoder(r.Body).Decode(&l); err != nil {
+		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
+		return
+	}
+	emptyOrErrorResponse(w, listener.d.LeaveEndpoint(&l))
+}
+
+func (listener *listener) discoverNew(w http.ResponseWriter, r *http.Request) {
+	var disco api.DiscoveryNotification
+	if err := json.NewDecoder(r.Body).Decode(&disco); err != nil {
+		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
+		return
+	}
+	emptyOrErrorResponse(w, listener.d.DiscoverNew(&disco))
+}
+
+func (listener *listener) discoverDelete(w http.ResponseWriter, r *http.Request) {
+	var disco api.DiscoveryNotification
+	if err := json.NewDecoder(r.Body).Decode(&disco); err != nil {
+		sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
+		return
+	}
+	emptyOrErrorResponse(w, listener.d.DiscoverDelete(&disco))
+}
+
+// ===
+
+func (listener *listener) getDefaultAddressSpaces(w http.ResponseWriter, r *http.Request) {
+	local, global, err := listener.i.GetDefaultAddressSpaces()
+	response := &iapi.GetAddressSpacesResponse{
+		LocalDefaultAddressSpace:  local,
+		GlobalDefaultAddressSpace: global,
+	}
+	objectOrErrorResponse(w, response, err)
+}
+
+func (listener *listener) requestPool(w http.ResponseWriter, r *http.Request) {
+	var rq iapi.RequestPoolRequest
+	if err := decode(w, r, &rq); err != nil {
+		return
+	}
+	poolID, pool, data, err := listener.i.RequestPool(rq.AddressSpace, rq.Pool, rq.SubPool, rq.Options, rq.V6)
+	if err != nil {
+		errorResponse(w, err.Error())
+		return
+	}
+	response := &iapi.RequestPoolResponse{
+		PoolID: poolID,
+		Pool:   pool.String(),
+		Data:   data,
+	}
+	objectResponse(w, response)
+}
+
+func (listener *listener) releasePool(w http.ResponseWriter, r *http.Request) {
+	var rq iapi.ReleasePoolRequest
+	if err := decode(w, r, &rq); err != nil {
+		return
+	}
+	err := listener.i.ReleasePool(rq.PoolID)
+	emptyOrErrorResponse(w, err)
+}
+
+func (listener *listener) requestAddress(w http.ResponseWriter, r *http.Request) {
+	var rq iapi.RequestAddressRequest
+	if err := decode(w, r, &rq); err != nil {
+		return
+	}
+	address, data, err := listener.i.RequestAddress(rq.PoolID, net.ParseIP(rq.Address), rq.Options)
+	if err != nil {
+		errorResponse(w, err.Error())
+		return
+	}
+	response := &iapi.RequestAddressResponse{
+		Address: address.String(),
+		Data:    data,
+	}
+	objectResponse(w, response)
+}
+
+func (listener *listener) releaseAddress(w http.ResponseWriter, r *http.Request) {
+	var rq iapi.ReleaseAddressRequest
+	if err := decode(w, r, &rq); err != nil {
+		return
+	}
+	err := listener.i.ReleaseAddress(rq.PoolID, net.ParseIP(rq.Address))
+	emptyOrErrorResponse(w, err)
+}
+
+// ===
+
+func notFound(w http.ResponseWriter, r *http.Request) {
+	http.NotFound(w, r)
+}
+
+func sendError(w http.ResponseWriter, msg string, code int) {
+	http.Error(w, msg, code)
+}
+
+func errorResponse(w http.ResponseWriter, fmtString string, item ...interface{}) {
+	json.NewEncoder(w).Encode(map[string]string{
+		"Err": fmt.Sprintf(fmtString, item...),
+	})
+}
+
+func objectResponse(w http.ResponseWriter, obj interface{}) {
+	if err := json.NewEncoder(w).Encode(obj); err != nil {
+		sendError(w, "Could not JSON encode response", http.StatusInternalServerError)
+		return
+	}
+}
+
+func emptyResponse(w http.ResponseWriter) {
+	json.NewEncoder(w).Encode(map[string]string{})
+}
+
+func objectOrErrorResponse(w http.ResponseWriter, obj interface{}, err error) {
+	if err != nil {
+		errorResponse(w, err.Error())
+		return
+	}
+	objectResponse(w, obj)
+}
+
+func emptyOrErrorResponse(w http.ResponseWriter, err error) {
+	if err != nil {
+		errorResponse(w, err.Error())
+		return
+	}
+	emptyResponse(w)
+}

prog/plugin/Dockerfile

@@ -0,0 +1,3 @@
+FROM weaveworks/weaveexec
+ADD ./plugin /home/weave/
+ENTRYPOINT ["/home/weave/plugin"]

prog/plugin/main.go

@@ -0,0 +1,163 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+
+	"github.com/docker/libnetwork/ipamapi"
+	go_docker "github.com/fsouza/go-dockerclient"
+	. "github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/common/docker"
+	ipamplugin "github.com/weaveworks/weave/plugin/ipam"
+	netplugin "github.com/weaveworks/weave/plugin/net"
+	"github.com/weaveworks/weave/plugin/skel"
+)
+
+var version = "(unreleased version)"
+
+func main() {
+	var (
+		justVersion      bool
+		address          string
+		nameserver       string
+		meshAddress      string
+		logLevel         string
+		meshNetworkName  string
+		noMulticastRoute bool
+		removeNetwork    bool
+	)
+
+	flag.BoolVar(&justVersion, "version", false, "print version and exit")
+	flag.StringVar(&logLevel, "log-level", "info", "logging level (debug, info, warning, error)")
+	flag.StringVar(&address, "socket", "/run/docker/plugins/weave.sock", "socket on which to listen")
+	flag.StringVar(&nameserver, "nameserver", "", "nameserver to provide to containers")
+	flag.StringVar(&meshAddress, "meshsocket", "/run/docker/plugins/weavemesh.sock", "socket on which to listen in mesh mode")
+	flag.StringVar(&meshNetworkName, "mesh-network-name", "weave", "network name to create in mesh mode")
+	flag.BoolVar(&noMulticastRoute, "no-multicast-route", false, "do not add a multicast route to network endpoints")
+	flag.BoolVar(&removeNetwork, "remove-network", false, "remove mesh network and exit")
+
+	flag.Parse()
+
+	if justVersion {
+		fmt.Printf("weave plugin %s\n", version)
+		os.Exit(0)
+	}
+
+	SetLogLevel(logLevel)
+
+	// API 1.21 is the first version that supports docker network commands
+	dockerClient, err := docker.NewVersionedClientFromEnv("1.21")
+	if err != nil {
+		Log.Fatalf("unable to connect to docker: %s", err)
+	}
+
+	if removeNetwork {
+		if _, err = dockerClient.Client.NetworkInfo(meshNetworkName); err == nil {
+			err = dockerClient.Client.RemoveNetwork(meshNetworkName)
+			if err != nil {
+				Log.Fatalf("unable to remove network: %s", err)
+			}
+		}
+		os.Exit(0)
+	}
+
+	Log.Println("Weave plugin", version, "Command line options:", os.Args[1:])
+	Log.Info(dockerClient.Info())
+
+	var globalListener, meshListener net.Listener
+	endChan := make(chan error, 1)
+	if address != "" {
+		globalListener, err := listenAndServe(dockerClient, address, nameserver, noMulticastRoute, endChan, "global", false)
+		if err != nil {
+			Log.Fatalf("unable to create driver: %s", err)
+		}
+		defer globalListener.Close()
+	}
+	if meshAddress != "" {
+		meshListener, err := listenAndServe(dockerClient, meshAddress, nameserver, noMulticastRoute, endChan, "local", true)
+		if err != nil {
+			Log.Fatalf("unable to create driver: %s", err)
+		}
+		defer meshListener.Close()
+	}
+
+	if meshNetworkName != "" {
+		createNetwork(dockerClient, meshNetworkName, meshAddress)
+	}
+
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, os.Interrupt, os.Kill, syscall.SIGTERM)
+
+	select {
+	case sig := <-sigChan:
+		Log.Debugf("Caught signal %s; shutting down", sig)
+		if err := dockerClient.Client.RemoveNetwork(meshNetworkName); err != nil {
+			Log.Fatal(err)
+		}
+	case err := <-endChan:
+		if err != nil {
+			Log.Errorf("Error from listener: %s", err)
+			globalListener.Close()
+			meshListener.Close()
+			os.Exit(1)
+		}
+	}
+}
+
+func listenAndServe(dockerClient *docker.Client, address, nameserver string, noMulticastRoute bool, endChan chan<- error, scope string, withIpam bool) (net.Listener, error) {
+	d, err := netplugin.New(dockerClient, version, nameserver, scope, noMulticastRoute)
+	if err != nil {
+		return nil, err
+	}
+
+	var i ipamapi.Ipam
+	if withIpam {
+		if i, err = ipamplugin.NewIpam(dockerClient, version); err != nil {
+			return nil, err
+		}
+	}
+
+	var listener net.Listener
+
+	// remove sockets from last invocation
+	if err := os.Remove(address); err != nil && !os.IsNotExist(err) {
+		return nil, err
+	}
+	listener, err = net.Listen("unix", address)
+	if err != nil {
+		return nil, err
+	}
+	Log.Printf("Listening on %s for %s scope", address, scope)
+
+	go func() {
+		endChan <- skel.Listen(listener, d, i)
+	}()
+
+	return listener, nil
+}
+
+func createNetwork(dockerClient *docker.Client, networkName, address string) {
+	if _, err := dockerClient.Client.NetworkInfo(networkName); err == nil {
+		Log.Printf("Docker network '%s' already exists", networkName)
+	} else if _, ok := err.(*go_docker.NoSuchNetwork); ok {
+		driverName := strings.TrimSuffix(address, ".sock")
+		if i := strings.LastIndex(driverName, "/"); i >= 0 {
+			driverName = driverName[i+1:]
+		}
+		options := go_docker.CreateNetworkOptions{
+			Name:           networkName,
+			CheckDuplicate: true,
+			Driver:         driverName,
+			IPAM:           go_docker.IPAMOptions{Driver: driverName},
+		}
+		_, err := dockerClient.Client.CreateNetwork(options)
+		if err != nil {
+			Log.Fatalf("Error creating network: %s", err)
+		}
+	}
+}

prog/weaveexec/Dockerfile

@@ -5,6 +5,8 @@ LABEL works.weave.role=system
 
 WORKDIR /home/weave
 VOLUME /w
+VOLUME /w-noop
+VOLUME /w-nomcast
 ENTRYPOINT ["/home/weave/sigproxy", "/home/weave/weave"]
 
 RUN apk add --update \
@@ -17,7 +19,9 @@ RUN apk add --update \
     bind-tools \
   && rm -rf /var/cache/apk/*
 
-ADD ./weave ./sigproxy ./weaveproxy /home/weave/
+ADD ./weave ./sigproxy ./weaveproxy ./symlink /home/weave/
 ADD ./netcheck ./docker_tls_args /usr/bin/
 ADD ./weavewait /w/w
+ADD ./weavewait_noop /w-noop/w
+ADD ./weavewait_nomcast /w-nomcast/w
 ADD ./docker.tgz /

prog/weaveexec/symlink

@@ -0,0 +1,18 @@
+#!/bin/sh
+# This lets us force-symlink a bunch of stuff all at once, so we can minimize
+# running containers.
+
+set -e
+
+[ -z "$WEAVE_DEBUG" ] || set -x
+
+target="$1"
+user="$(stat -c '%u:%g' "$target")"
+mode="$(stat -c '%a' "$target")"
+shift 1
+
+for link in "$@" ; do
+  ln -sfT "$target" "$link"
+done
+chown -h "$user" "$@"
+chmod "$mode" "$@"

prog/weaveproxy/main.go

@@ -12,14 +12,16 @@ import (
 )
 
 var (
-	version = "(unreleased version)"
+	version           = "(unreleased version)"
+	defaultDockerHost = "unix:///var/run/docker.sock"
 )
 
 func main() {
 	var (
 		justVersion bool
 		logLevel    = "info"
-		c           = proxy.Config{ListenAddrs: []string{}}
+		c           = proxy.Config{Image: "weaveworks/weaveexec"}
+		withDNS     bool
 	)
 
 	c.Version = version
@@ -35,11 +37,12 @@ func main() {
 	mflag.BoolVar(&c.NoRewriteHosts, []string{"-no-rewrite-hosts"}, false, "do not automatically rewrite /etc/hosts. Use if you need the docker IP to remain in /etc/hosts")
 	mflag.StringVar(&c.TLSConfig.CACert, []string{"#tlscacert", "-tlscacert"}, "", "Trust certs signed only by this CA")
 	mflag.StringVar(&c.TLSConfig.Cert, []string{"#tlscert", "-tlscert"}, "", "Path to TLS certificate file")
-	mflag.BoolVar(&c.TLSConfig.Enabled, []string{"#tls", "-tls"}, false, "Use TLS; implied by --tls-verify")
+	mflag.BoolVar(&c.TLSConfig.Enabled, []string{"#tls", "-tls"}, false, "Use TLS; implied by --tlsverify")
 	mflag.StringVar(&c.TLSConfig.Key, []string{"#tlskey", "-tlskey"}, "", "Path to TLS key file")
 	mflag.BoolVar(&c.TLSConfig.Verify, []string{"#tlsverify", "-tlsverify"}, false, "Use TLS and verify the remote")
-	mflag.BoolVar(&c.WithDNS, []string{"-with-dns", "w"}, false, "instruct created containers to always use weaveDNS as their nameserver")
+	mflag.BoolVar(&withDNS, []string{"#-with-dns", "#w"}, false, "option removed")
 	mflag.BoolVar(&c.WithoutDNS, []string{"-without-dns"}, false, "instruct created containers to never use weaveDNS as their nameserver")
+	mflag.BoolVar(&c.NoMulticastRoute, []string{"-no-multicast-route"}, false, "do not add a multicast route via the weave interface when attaching containers")
 	mflag.Parse()
 
 	if justVersion {
@@ -47,15 +50,24 @@ func main() {
 		os.Exit(0)
 	}
 
-	if c.WithDNS && c.WithoutDNS {
-		Log.Fatalf("Cannot use both '--with-dns' and '--without-dns' flags")
-	}
-
 	SetLogLevel(logLevel)
 
+	if image := os.Getenv("EXEC_IMAGE"); image != "" {
+		c.Image = image
+	}
+
 	Log.Infoln("weave proxy", version)
 	Log.Infoln("Command line arguments:", strings.Join(os.Args[1:], " "))
 
+	if withDNS {
+		Log.Warning("--with-dns option has been removed; DNS is on by default")
+	}
+
+	c.DockerHost = defaultDockerHost
+	if dockerHost := os.Getenv("DOCKER_HOST"); dockerHost != "" {
+		c.DockerHost = dockerHost
+	}
+
 	p, err := proxy.NewProxy(c)
 	if err != nil {
 		Log.Fatalf("Could not start proxy: %s", err)

prog/weaver/http.go

@@ -1,17 +1,20 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
-	"github.com/gorilla/mux"
-	. "github.com/weaveworks/weave/common"
-	"github.com/weaveworks/weave/ipam"
-	"github.com/weaveworks/weave/nameserver"
-	"github.com/weaveworks/weave/net/address"
-	weave "github.com/weaveworks/weave/router"
 	"net/http"
 	"strings"
 	"text/template"
+
+	"github.com/gorilla/mux"
+	. "github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/ipam"
+	"github.com/weaveworks/weave/mesh"
+	"github.com/weaveworks/weave/nameserver"
+	"github.com/weaveworks/weave/net/address"
+	weave "github.com/weaveworks/weave/router"
 )
 
 var rootTemplate = template.New("root").Funcs(map[string]interface{}{
@@ -24,14 +27,74 @@ var rootTemplate = template.New("root").Funcs(map[string]interface{}{
 		}
 		return count
 	},
-	"printConnectionCounts": func(conns []weave.LocalConnectionStatus) string {
+	"printList": func(list []string) string {
+		if len(list) == 0 {
+			return "none"
+		}
+		return strings.Join(list, ", ")
+	},
+	"printIPAMRanges": func(router weave.NetworkRouterStatus, status ipam.Status) string {
+		var buffer bytes.Buffer
+
+		type stats struct {
+			ips       uint32
+			nickname  string
+			reachable bool
+		}
+
+		peerStats := make(map[string]*stats)
+
+		for _, entry := range status.Entries {
+			s, found := peerStats[entry.Peer]
+			if !found {
+				s = &stats{nickname: entry.Nickname, reachable: entry.IsKnownPeer}
+				peerStats[entry.Peer] = s
+			}
+			s.ips += entry.Size
+		}
+
+		printOwned := func(name string, nickName string, reachable bool, ips uint32) {
+			reachableStr := ""
+			if !reachable {
+				reachableStr = "- unreachable!"
+			}
+			percentageRanges := float32(ips) * 100.0 / float32(status.RangeNumIPs)
+
+			displayName := name + "(" + nickName + ")"
+			fmt.Fprintf(&buffer, "%-37v %8d IPs (%04.1f%% of total) %s\n",
+				displayName, ips, percentageRanges, reachableStr)
+		}
+
+		// print the local info first
+		if ourStats := peerStats[router.Name]; ourStats != nil {
+			printOwned(router.Name, ourStats.nickname, true, ourStats.ips)
+		}
+
+		// and then the rest
+		for peer, stats := range peerStats {
+			if peer != router.Name {
+				printOwned(peer, stats.nickname, stats.reachable, stats.ips)
+			}
+		}
+
+		return buffer.String()
+	},
+	"allIPAMOwnersUnreachable": func(status ipam.Status) bool {
+		for _, entry := range status.Entries {
+			if entry.Size > 0 && entry.IsKnownPeer {
+				return false
+			}
+		}
+		return true
+	},
+	"printConnectionCounts": func(conns []mesh.LocalConnectionStatus) string {
 		counts := make(map[string]int)
 		for _, conn := range conns {
 			counts[conn.State]++
 		}
 		return printCounts(counts, []string{"established", "pending", "retrying", "failed", "connecting"})
 	},
-	"printPeerConnectionCounts": func(peers []weave.PeerStatus) string {
+	"printPeerConnectionCounts": func(peers []mesh.PeerStatus) string {
 		counts := make(map[string]int)
 		for _, peer := range peers {
 			for _, conn := range peer.Connections {
@@ -75,40 +138,48 @@ func defTemplate(name string, text string) *template.Template {
 }
 
 var statusTemplate = defTemplate("status", `\
-       Version: {{.Version}}
+        Version: {{.Version}}
 
-       Service: router
-      Protocol: {{.Router.Protocol}} \
+        Service: router
+       Protocol: {{.Router.Protocol}} \
 {{if eq .Router.ProtocolMinVersion .Router.ProtocolMaxVersion}}\
 {{.Router.ProtocolMaxVersion}}\
 {{else}}\
 {{.Router.ProtocolMinVersion}}..{{.Router.ProtocolMaxVersion}}\
 {{end}}
-          Name: {{.Router.Name}}({{.Router.NickName}})
-    Encryption: {{printState .Router.Encryption}}
- PeerDiscovery: {{printState .Router.PeerDiscovery}}
-       Targets: {{len .Router.Targets}}
-   Connections: {{len .Router.Connections}}{{with printConnectionCounts .Router.Connections}} ({{.}}){{end}}
-         Peers: {{len .Router.Peers}}{{with printPeerConnectionCounts .Router.Peers}} (with {{.}} connections){{end}}
+           Name: {{.Router.Name}}({{.Router.NickName}})
+     Encryption: {{printState .Router.Encryption}}
+  PeerDiscovery: {{printState .Router.PeerDiscovery}}
+        Targets: {{len .Router.Targets}}
+    Connections: {{len .Router.Connections}}{{with printConnectionCounts .Router.Connections}} ({{.}}){{end}}
+          Peers: {{len .Router.Peers}}{{with printPeerConnectionCounts .Router.Peers}} (with {{.}} connections){{end}}
+ TrustedSubnets: {{printList .Router.TrustedSubnets}}
 {{if .IPAM}}\
 
-       Service: ipam
+        Service: ipam
 {{if .IPAM.Entries}}\
-     Consensus: achieved
-{{else if .IPAM.Paxos}}\
-     Consensus: waiting (quorum: {{.IPAM.Paxos.Quorum}}, known: {{.IPAM.Paxos.KnownNodes}})
+{{if allIPAMOwnersUnreachable .IPAM}}\
+         Status: all IP ranges owned by unreachable peers - use 'rmpeer' if they are dead
+{{else if len .IPAM.PendingAllocates}}\
+         Status: waiting for IP range grant from peers
 {{else}}\
-     Consensus: deferred
+         Status: ready
 {{end}}\
-         Range: {{.IPAM.Range}}
- DefaultSubnet: {{.IPAM.DefaultSubnet}}
+{{else if .IPAM.Paxos}}\
+         Status: awaiting consensus (quorum: {{.IPAM.Paxos.Quorum}}, known: {{.IPAM.Paxos.KnownNodes}})
+{{else}}\
+         Status: idle
+{{end}}\
+          Range: {{.IPAM.Range}}
+  DefaultSubnet: {{.IPAM.DefaultSubnet}}
 {{end}}\
 {{if .DNS}}\
 
-       Service: dns
-        Domain: {{.DNS.Domain}}
-           TTL: {{.DNS.TTL}}
-       Entries: {{countDNSEntries .DNS.Entries}}
+        Service: dns
+         Domain: {{.DNS.Domain}}
+       Upstream: {{printList .DNS.Upstream}}
+            TTL: {{.DNS.TTL}}
+        Entries: {{countDNSEntries .DNS.Entries}}
 {{end}}\
 `)
 
@@ -128,7 +199,7 @@ var peersTemplate = defTemplate("peers", `\
 {{.Name}}({{.NickName}})
 {{range .Connections}}\
    {{if .Outbound}}->{{else}}<-{{end}} {{printf "%-21v" .Address}} \
-{{$nameNickName := printf "%v(%v)" .Name .NickName}}{{printf "%-32v" $nameNickName}} \
+{{$nameNickName := printf "%v(%v)" .Name .NickName}}{{printf "%-37v" $nameNickName}} \
 {{if .Established}}established{{else}}pending{{end}}
 {{end}}\
 {{end}}\
@@ -144,18 +215,20 @@ var dnsEntriesTemplate = defTemplate("dnsEntries", `\
 {{end}}\
 `)
 
+var ipamTemplate = defTemplate("ipamTemplate", `{{printIPAMRanges .Router .IPAM}}`)
+
 type WeaveStatus struct {
 	Version string
-	Router  *weave.Status      `json:"Router,omitempty"`
-	IPAM    *ipam.Status       `json:"IPAM,omitempty"`
-	DNS     *nameserver.Status `json:"DNS,omitempty"`
+	Router  *weave.NetworkRouterStatus `json:"Router,omitempty"`
+	IPAM    *ipam.Status               `json:"IPAM,omitempty"`
+	DNS     *nameserver.Status         `json:"DNS,omitempty"`
 }
 
-func HandleHTTP(muxRouter *mux.Router, version string, router *weave.Router, allocator *ipam.Allocator, defaultSubnet address.CIDR, ns *nameserver.Nameserver, dnsserver *nameserver.DNSServer) {
+func HandleHTTP(muxRouter *mux.Router, version string, router *weave.NetworkRouter, allocator *ipam.Allocator, defaultSubnet address.CIDR, ns *nameserver.Nameserver, dnsserver *nameserver.DNSServer) {
 	status := func() WeaveStatus {
 		return WeaveStatus{
 			version,
-			weave.NewStatus(router),
+			weave.NewNetworkRouterStatus(router),
 			ipam.NewStatus(allocator, defaultSubnet),
 			nameserver.NewStatus(ns, dnsserver)}
 	}
@@ -173,7 +246,13 @@ func HandleHTTP(muxRouter *mux.Router, version string, router *weave.Router, all
 
 	muxRouter.Methods("GET").Path("/report").Queries("format", "{format}").HandlerFunc(
 		func(w http.ResponseWriter, r *http.Request) {
-			formatTemplate, err := template.New("format").Parse(mux.Vars(r)["format"])
+			funcs := template.FuncMap{
+				"json": func(v interface{}) string {
+					a, _ := json.Marshal(v)
+					return string(a)
+				},
+			}
+			formatTemplate, err := template.New("format").Funcs(funcs).Parse(mux.Vars(r)["format"])
 			if err != nil {
 				http.Error(w, err.Error(), http.StatusBadRequest)
 				return
@@ -199,5 +278,6 @@ func HandleHTTP(muxRouter *mux.Router, version string, router *weave.Router, all
 	defHandler("/status/connections", connectionsTemplate)
 	defHandler("/status/peers", peersTemplate)
 	defHandler("/status/dns", dnsEntriesTemplate)
+	defHandler("/status/ipam", ipamTemplate)
 
 }

prog/weaver/main.go

@@ -13,11 +13,12 @@ import (
 	"github.com/davecheney/profile"
 	"github.com/docker/docker/pkg/mflag"
 	"github.com/gorilla/mux"
-	"github.com/weaveworks/go-odp/odp"
 
 	. "github.com/weaveworks/weave/common"
 	"github.com/weaveworks/weave/common/docker"
+	"github.com/weaveworks/weave/common/odp"
 	"github.com/weaveworks/weave/ipam"
+	"github.com/weaveworks/weave/mesh"
 	"github.com/weaveworks/weave/nameserver"
 	weavenet "github.com/weaveworks/weave/net"
 	"github.com/weaveworks/weave/net/address"
@@ -42,7 +43,8 @@ func main() {
 		deleteDatapath       bool
 		addDatapathInterface string
 
-		config                    weave.Config
+		config                    mesh.Config
+		networkConfig             weave.NetworkConfig
 		protocolMinVersion        int
 		ifaceName                 string
 		routerName                string
@@ -67,15 +69,22 @@ func main() {
 		dnsEffectiveListenAddress string
 		iface                     *net.Interface
 		datapathName              string
+		trustedSubnetStr          string
+
+		defaultDockerHost = "unix:///var/run/docker.sock"
 	)
 
+	if val := os.Getenv("DOCKER_HOST"); val != "" {
+		defaultDockerHost = val
+	}
+
 	mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
 	mflag.BoolVar(&createDatapath, []string{"-create-datapath"}, false, "create ODP datapath and exit")
 	mflag.BoolVar(&deleteDatapath, []string{"-delete-datapath"}, false, "delete ODP datapath and exit")
 	mflag.StringVar(&addDatapathInterface, []string{"-add-datapath-iface"}, "", "add a network interface to the ODP datapath and exit")
 
-	mflag.IntVar(&config.Port, []string{"#port", "-port"}, weave.Port, "router port")
-	mflag.IntVar(&protocolMinVersion, []string{"-min-protocol-version"}, weave.ProtocolMinVersion, "minimum weave protocol version")
+	mflag.IntVar(&config.Port, []string{"#port", "-port"}, mesh.Port, "router port")
+	mflag.IntVar(&protocolMinVersion, []string{"-min-protocol-version"}, mesh.ProtocolMinVersion, "minimum weave protocol version")
 	mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to capture/inject from (disabled if blank)")
 	mflag.StringVar(&routerName, []string{"#name", "-name"}, "", "name of router (defaults to MAC of interface)")
 	mflag.StringVar(&nickName, []string{"#nickname", "-nickname"}, "", "nickname of peer (defaults to hostname)")
@@ -86,11 +95,11 @@ func main() {
 	mflag.IntVar(&config.ConnLimit, []string{"#connlimit", "#-connlimit", "-conn-limit"}, 30, "connection limit (0 for unlimited)")
 	mflag.BoolVar(&noDiscovery, []string{"#nodiscovery", "#-nodiscovery", "-no-discovery"}, false, "disable peer discovery")
 	mflag.IntVar(&bufSzMB, []string{"#bufsz", "-bufsz"}, 8, "capture buffer size in MB")
-	mflag.StringVar(&httpAddr, []string{"#httpaddr", "#-httpaddr", "-http-addr"}, fmt.Sprintf(":%d", weave.HTTPPort), "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
+	mflag.StringVar(&httpAddr, []string{"#httpaddr", "#-httpaddr", "-http-addr"}, "", "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
 	mflag.StringVar(&iprangeCIDR, []string{"#iprange", "#-iprange", "-ipalloc-range"}, "", "IP address range reserved for automatic allocation, in CIDR notation")
 	mflag.StringVar(&ipsubnetCIDR, []string{"#ipsubnet", "#-ipsubnet", "-ipalloc-default-subnet"}, "", "subnet to allocate within by default, in CIDR notation")
 	mflag.IntVar(&peerCount, []string{"#initpeercount", "#-initpeercount", "-init-peer-count"}, 0, "number of peers in network (for IP address allocation)")
-	mflag.StringVar(&dockerAPI, []string{"#api", "#-api", "-docker-api"}, "", "Docker API endpoint, e.g. unix:///var/run/docker.sock")
+	mflag.StringVar(&dockerAPI, []string{"#api", "#-api", "-docker-api"}, defaultDockerHost, "Docker API endpoint")
 	mflag.BoolVar(&noDNS, []string{"-no-dns"}, false, "disable DNS server")
 	mflag.StringVar(&dnsDomain, []string{"-dns-domain"}, nameserver.DefaultDomain, "local domain to server requests for")
 	mflag.StringVar(&dnsListenAddress, []string{"-dns-listen-address"}, nameserver.DefaultListenAddress, "address to listen on for DNS requests")
@@ -99,6 +108,8 @@ func main() {
 	mflag.StringVar(&dnsEffectiveListenAddress, []string{"-dns-effective-listen-address"}, "", "address DNS will actually be listening, after Docker port mapping")
 	mflag.StringVar(&datapathName, []string{"-datapath"}, "", "ODP datapath name")
 
+	mflag.StringVar(&trustedSubnetStr, []string{"-trusted-subnets"}, "", "Command separated list of trusted subnets in CIDR notation")
+
 	// crude way of detecting that we probably have been started in a
 	// container, with `weave launch` --> suppress misleading paths in
 	// mflags error messages.
@@ -119,8 +130,12 @@ func main() {
 		os.Exit(0)
 
 	case createDatapath:
-		err := weave.CreateDatapath(datapathName)
-		if odp.IsKernelLacksODPError(err) {
+		err, odp_supported := odp.CreateDatapath(datapathName)
+		if !odp_supported {
+			if err != nil {
+				Log.Error(err)
+			}
+
 			// When the kernel lacks ODP support, exit
 			// with a special status to distinguish it for
 			// the weave script.
@@ -131,23 +146,23 @@ func main() {
 		os.Exit(0)
 
 	case deleteDatapath:
-		checkFatal(weave.DeleteDatapath(datapathName))
+		checkFatal(odp.DeleteDatapath(datapathName))
 		os.Exit(0)
 
 	case addDatapathInterface != "":
-		checkFatal(weave.AddDatapathInterface(datapathName, addDatapathInterface))
+		checkFatal(odp.AddDatapathInterface(datapathName, addDatapathInterface))
 		os.Exit(0)
 	}
 
 	Log.Println("Command line options:", options())
 	Log.Println("Command line peers:", peers)
 
-	if protocolMinVersion < weave.ProtocolMinVersion || protocolMinVersion > weave.ProtocolMaxVersion {
-		Log.Fatalf("--min-protocol-version must be in range [%d,%d]", weave.ProtocolMinVersion, weave.ProtocolMaxVersion)
+	if protocolMinVersion < mesh.ProtocolMinVersion || protocolMinVersion > mesh.ProtocolMaxVersion {
+		Log.Fatalf("--min-protocol-version must be in range [%d,%d]", mesh.ProtocolMinVersion, mesh.ProtocolMaxVersion)
 	}
 	config.ProtocolMinVersion = byte(protocolMinVersion)
 
-	var fastDPOverlay weave.Overlay
+	var fastDPOverlay weave.NetworkOverlay
 	if datapathName != "" {
 		// A datapath name implies that "Bridge" and "Overlay"
 		// packet handling use fast datapath, although other
@@ -160,7 +175,7 @@ func main() {
 		})
 
 		checkFatal(err)
-		config.Bridge = fastdp.Bridge()
+		networkConfig.Bridge = fastdp.Bridge()
 		fastDPOverlay = fastdp.Overlay()
 	}
 
@@ -175,7 +190,7 @@ func main() {
 		checkFatal(err)
 
 		// bufsz flag is in MB
-		config.Bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024)
+		networkConfig.Bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024)
 		checkFatal(err)
 	}
 
@@ -187,10 +202,7 @@ func main() {
 		Log.Println("Communication between peers is unencrypted.")
 	} else {
 		config.Password = []byte(password)
-		Log.Println("Communication between peers is encrypted.")
-
-		// fastdp doesn't support encryption
-		fastDPOverlay = nil
+		Log.Println("Communication between peers via untrusted networks is encrypted.")
 	}
 
 	overlays := weave.NewOverlaySwitch()
@@ -200,7 +212,6 @@ func main() {
 	sleeve := weave.NewSleeveOverlay(config.Port)
 	overlays.Add("sleeve", sleeve)
 	overlays.SetCompatOverlay(sleeve)
-	config.Overlay = overlays
 
 	if routerName == "" {
 		if iface == nil {
@@ -209,7 +220,7 @@ func main() {
 		routerName = iface.HardwareAddr.String()
 	}
 
-	name, err := weave.PeerNameFromUserInput(routerName)
+	name, err := mesh.PeerNameFromUserInput(routerName)
 	checkFatal(err)
 
 	if nickName == "" {
@@ -227,12 +238,16 @@ func main() {
 	config.PeerDiscovery = !noDiscovery
 
 	if pktdebug {
-		config.PacketLogging = packetLogging{}
+		networkConfig.PacketLogging = packetLogging{}
 	} else {
-		config.PacketLogging = nopPacketLogging{}
+		networkConfig.PacketLogging = nopPacketLogging{}
 	}
 
-	router := weave.NewRouter(config, name, nickName)
+	if config.TrustedSubnets, err = parseTrustedSubnets(trustedSubnetStr); err != nil {
+		Log.Fatal("Unable to parse trusted subnets: ", err)
+	}
+
+	router := weave.NewNetworkRouter(config, networkConfig, name, nickName, overlays)
 	Log.Println("Our name is", router.Ourself)
 
 	var dockerCli *docker.Client
@@ -240,6 +255,8 @@ func main() {
 		dc, err := docker.NewClient(dockerAPI)
 		if err != nil {
 			Log.Fatal("Unable to start docker client: ", err)
+		} else {
+			Log.Info(dc.Info())
 		}
 		dockerCli = dc
 	}
@@ -250,10 +267,13 @@ func main() {
 			}
 		}
 	}
+	isKnownPeer := func(name mesh.PeerName) bool {
+		return router.Peers.Fetch(name) != nil
+	}
 	var allocator *ipam.Allocator
 	var defaultSubnet address.CIDR
 	if iprangeCIDR != "" {
-		allocator, defaultSubnet = createAllocator(router, iprangeCIDR, ipsubnetCIDR, determineQuorum(peerCount, peers))
+		allocator, defaultSubnet = createAllocator(router.Router, iprangeCIDR, ipsubnetCIDR, determineQuorum(peerCount, peers), isKnownPeer)
 		observeContainers(allocator)
 	} else if peerCount > 0 {
 		Log.Fatal("--init-peer-count flag specified without --ipalloc-range")
@@ -264,7 +284,8 @@ func main() {
 		dnsserver *nameserver.DNSServer
 	)
 	if !noDNS {
-		ns = nameserver.New(router.Ourself.Peer.Name, router.Peers, dnsDomain)
+		ns = nameserver.New(router.Ourself.Peer.Name, dnsDomain, isKnownPeer)
+		router.Peers.OnGC(func(peer *mesh.Peer) { ns.PeerGone(peer.Name) })
 		ns.SetGossip(router.NewGossip("nameserver", ns))
 		observeContainers(ns)
 		ns.Start()
@@ -359,7 +380,7 @@ func parseAndCheckCIDR(cidrStr string) address.CIDR {
 	return cidr
 }
 
-func createAllocator(router *weave.Router, ipRangeStr string, defaultSubnetStr string, quorum uint) (*ipam.Allocator, address.CIDR) {
+func createAllocator(router *mesh.Router, ipRangeStr string, defaultSubnetStr string, quorum uint, isKnownPeer func(mesh.PeerName) bool) (*ipam.Allocator, address.CIDR) {
 	ipRange := parseAndCheckCIDR(ipRangeStr)
 	defaultSubnet := ipRange
 	if defaultSubnetStr != "" {
@@ -368,7 +389,7 @@ func createAllocator(router *weave.Router, ipRangeStr string, defaultSubnetStr s
 			Log.Fatalf("IP address allocation default subnet %s does not overlap with allocation range %s", defaultSubnet, ipRange)
 		}
 	}
-	allocator := ipam.NewAllocator(router.Ourself.Peer.Name, router.Ourself.Peer.UID, router.Ourself.Peer.NickName, ipRange.Range(), quorum)
+	allocator := ipam.NewAllocator(router.Ourself.Peer.Name, router.Ourself.Peer.UID, router.Ourself.Peer.NickName, ipRange.Range(), quorum, isKnownPeer)
 
 	allocator.SetInterfaces(router.NewGossip("IPallocation", allocator))
 	allocator.Start()
@@ -396,6 +417,24 @@ func determineQuorum(initPeerCountFlag int, peers []string) uint {
 	return quorum
 }
 
+func parseTrustedSubnets(trustedSubnetStr string) ([]*net.IPNet, error) {
+	trustedSubnets := []*net.IPNet{}
+
+	if trustedSubnetStr == "" {
+		return trustedSubnets, nil
+	}
+
+	for _, subnetStr := range strings.Split(trustedSubnetStr, ",") {
+		_, subnet, err := net.ParseCIDR(subnetStr)
+		if err != nil {
+			return nil, err
+		}
+		trustedSubnets = append(trustedSubnets, subnet)
+	}
+
+	return trustedSubnets, nil
+}
+
 func listenAndServeHTTP(httpAddr string, muxRouter *mux.Router) {
 	protocol := "tcp"
 	if strings.HasPrefix(httpAddr, "/") {

prog/weavewait/check_network.go

@@ -0,0 +1,7 @@
+// +build !iface,!mcast
+
+package main
+
+func checkNetwork() error {
+	return nil
+}

prog/weavewait/check_network_iface.go

@@ -0,0 +1,12 @@
+// +build iface,!mcast
+
+package main
+
+import (
+	weavenet "github.com/weaveworks/weave/net"
+)
+
+func checkNetwork() error {
+	_, err := weavenet.EnsureInterface("ethwe")
+	return err
+}

prog/weavewait/check_network_iface_mcast.go

@@ -0,0 +1,12 @@
+// +build iface,mcast
+
+package main
+
+import (
+	weavenet "github.com/weaveworks/weave/net"
+)
+
+func checkNetwork() error {
+	_, err := weavenet.EnsureInterfaceAndMcastRoute("ethwe")
+	return err
+}

prog/weavewait/main.go

@@ -6,8 +6,6 @@ import (
 	"os"
 	"os/exec"
 	"syscall"
-
-	weavenet "github.com/weaveworks/weave/net"
 )
 
 var (
@@ -19,8 +17,7 @@ func main() {
 		args = os.Args[1:]
 	)
 
-	_, err := weavenet.EnsureInterfaceAndMcastRoute("ethwe")
-	checkErr(err)
+	checkErr(checkNetwork())
 
 	if len(args) == 0 {
 		checkErr(ErrNoCommandSpecified)

proxy/common.go

@@ -21,6 +21,7 @@ var (
 	containerIDRegexp   = regexp.MustCompile("^(/v[0-9\\.]*)?/containers/([^/]*)/.*")
 	weaveWaitEntrypoint = []string{"/w/w"}
 	weaveEntrypoint     = "/home/weave/weaver"
+	weaveContainerName  = "/weave"
 )
 
 func callWeave(args ...string) ([]byte, []byte, error) {
@@ -38,6 +39,7 @@ func callWeave(args ...string) ([]byte, []byte, error) {
 	}
 
 	propagateEnv("DOCKER_BRIDGE")
+	propagateEnv("DOCKER_HOST")
 
 	// Propogage WEAVE_DEBUG, to make debugging easier.
 	propagateEnv("WEAVE_DEBUG")
@@ -154,3 +156,25 @@ func weaveContainerIPs(containerID string) (mac string, ips []net.IP, nets []*ne
 	}
 	return
 }
+
+func addVolume(hostConfig jsonObject, source, target, mode string) error {
+	configBinds, err := hostConfig.StringArray("Binds")
+	if err != nil {
+		return err
+	}
+
+	var binds []string
+	for _, bind := range configBinds {
+		s := strings.Split(bind, ":")
+		if len(s) >= 2 && s[1] == target {
+			continue
+		}
+		binds = append(binds, bind)
+	}
+	bind := source + ":" + target
+	if mode != "" {
+		bind += ":" + mode
+	}
+	hostConfig["Binds"] = append(binds, bind)
+	return nil
+}

proxy/create_container_interceptor.go

@@ -53,8 +53,14 @@ func (i *createContainerInterceptor) InterceptRequest(r *http.Request) error {
 		Log.Infof("Leaving container alone because %s", err)
 	} else {
 		Log.Infof("Creating container with WEAVE_CIDR \"%s\"", strings.Join(cidrs, " "))
-		if err := i.proxy.addWeaveWaitVolume(hostConfig); err != nil {
-			return err
+		if i.proxy.NoMulticastRoute {
+			if err := addVolume(hostConfig, i.proxy.weaveWaitNomcastVolume, "/w", "ro"); err != nil {
+				return err
+			}
+		} else {
+			if err := addVolume(hostConfig, i.proxy.weaveWaitVolume, "/w", "ro"); err != nil {
+				return err
+			}
 		}
 		if err := i.setWeaveWaitEntrypoint(container); err != nil {
 			return err

proxy/inspect_container_interceptor.go

@@ -22,30 +22,9 @@ func (i *inspectContainerInterceptor) InterceptResponse(r *http.Response) error
 		return err
 	}
 
-	if err := updateContainerNetworkSettings(container); err != nil {
+	if err := i.proxy.updateContainerNetworkSettings(container); err != nil {
 		Log.Warningf("Inspecting container %s failed: %s", container["Id"], err)
 	}
 
 	return marshalResponseBody(r, container)
 }
-
-func updateContainerNetworkSettings(container jsonObject) error {
-	containerID, err := container.String("Id")
-	if err != nil {
-		return err
-	}
-
-	mac, ips, nets, err := weaveContainerIPs(containerID)
-	if err != nil || len(ips) == 0 {
-		return err
-	}
-
-	networkSettings, err := container.Object("NetworkSettings")
-	if err != nil {
-		return err
-	}
-	networkSettings["MacAddress"] = mac
-	networkSettings["IPAddress"] = ips[0].String()
-	networkSettings["IPPrefixLen"], _ = nets[0].Mask.Size()
-	return nil
-}

proxy/inspect_exec_interceptor.go

@@ -27,7 +27,7 @@ func (i *inspectExecInterceptor) InterceptResponse(r *http.Response) error {
 		return err
 	}
 
-	if err := updateContainerNetworkSettings(container); err != nil {
+	if err := i.proxy.updateContainerNetworkSettings(container); err != nil {
 		Log.Warningf("Inspecting exec %s failed: %s", exec["Id"], err)
 	}
 

proxy/proxy.go

@@ -1,6 +1,7 @@
 package proxy
 
 import (
+	"bytes"
 	"crypto/tls"
 	"errors"
 	"fmt"
@@ -8,6 +9,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"path/filepath"
 	"regexp"
 	"strings"
 	"sync"
@@ -16,16 +18,15 @@ import (
 	docker "github.com/fsouza/go-dockerclient"
 	. "github.com/weaveworks/weave/common"
 	weavedocker "github.com/weaveworks/weave/common/docker"
-	"github.com/weaveworks/weave/nameserver"
-	"github.com/weaveworks/weave/router"
 )
 
 const (
 	defaultCaFile   = "ca.pem"
 	defaultKeyFile  = "key.pem"
 	defaultCertFile = "cert.pem"
-	dockerSock      = "/var/run/docker.sock"
-	dockerSockUnix  = "unix://" + dockerSock
+
+	weaveSock     = "/var/run/weave/weave.sock"
+	weaveSockUnix = "unix://" + weaveSock
 )
 
 var (
@@ -47,14 +48,16 @@ type Config struct {
 	HostnameFromLabel   string
 	HostnameMatch       string
 	HostnameReplacement string
+	Image               string
 	ListenAddrs         []string
 	RewriteInspect      bool
 	NoDefaultIPAM       bool
 	NoRewriteHosts      bool
 	TLSConfig           TLSConfig
 	Version             string
-	WithDNS             bool
 	WithoutDNS          bool
+	NoMulticastRoute    bool
+	DockerHost          string
 }
 
 type wait struct {
@@ -66,12 +69,14 @@ type wait struct {
 type Proxy struct {
 	sync.Mutex
 	Config
-	client              *docker.Client
-	dockerBridgeIP      string
-	hostnameMatchRegexp *regexp.Regexp
-	weaveWaitVolume     string
-	normalisedAddrs     []string
-	waiters             map[*http.Request]*wait
+	client                 *docker.Client
+	dockerBridgeIP         string
+	hostnameMatchRegexp    *regexp.Regexp
+	weaveWaitVolume        string
+	weaveWaitNoopVolume    string
+	weaveWaitNomcastVolume string
+	normalisedAddrs        []string
+	waiters                map[*http.Request]*wait
 }
 
 func NewProxy(c Config) (*Proxy, error) {
@@ -81,14 +86,16 @@ func NewProxy(c Config) (*Proxy, error) {
 		Log.Fatalf("Could not configure tls for proxy: %s", err)
 	}
 
-	// We pin the protocol version to 1.15 (which corresponds to
-	// Docker 1.3.x; the earliest version supported by weave) in order
+	// We pin the protocol version to 1.18 (which corresponds to
+	// Docker 1.6.x; the earliest version supported by weave) in order
 	// to insulate ourselves from breaking changes to the API, as
 	// happened in 1.20 (Docker 1.8.0) when the presentation of
 	// volumes changed in `inspect`.
-	client, err := weavedocker.NewVersionedClient(dockerSockUnix, "1.15")
+	client, err := weavedocker.NewVersionedClient(c.DockerHost, "1.18")
 	if err != nil {
 		return nil, err
+	} else {
+		Log.Info(client.Info())
 	}
 	p.client = client.Client
 
@@ -106,7 +113,7 @@ func NewProxy(c Config) (*Proxy, error) {
 		return nil, err
 	}
 
-	if err = p.findWeaveWaitVolume(); err != nil {
+	if err = p.findWeaveWaitVolumes(); err != nil {
 		return nil, err
 	}
 
@@ -132,26 +139,46 @@ func (proxy *Proxy) AttachExistingContainers() {
 }
 
 func (proxy *Proxy) Dial() (net.Conn, error) {
-	return net.Dial("unix", dockerSock)
+	proto := "tcp"
+	addr := proxy.Config.DockerHost
+	switch {
+	case strings.HasPrefix(addr, "unix://"):
+		proto = "unix"
+		addr = strings.TrimPrefix(addr, "unix://")
+	case strings.HasPrefix(addr, "tcp://"):
+		addr = strings.TrimPrefix(addr, "tcp://")
+	}
+	return net.Dial(proto, addr)
 }
 
-func (proxy *Proxy) findWeaveWaitVolume() error {
+func (proxy *Proxy) findWeaveWaitVolumes() error {
+	var err error
+	if proxy.weaveWaitVolume, err = proxy.findVolume("/w"); err != nil {
+		return err
+	}
+	if proxy.weaveWaitNoopVolume, err = proxy.findVolume("/w-noop"); err != nil {
+		return err
+	}
+	proxy.weaveWaitNomcastVolume, err = proxy.findVolume("/w-nomcast")
+	return err
+}
+
+func (proxy *Proxy) findVolume(v string) (string, error) {
 	container, err := proxy.client.InspectContainer("weaveproxy")
 	if err != nil {
-		return fmt.Errorf("Could not find the weavewait volume: %s", err)
+		return "", fmt.Errorf("Could not find the weavewait volume: %s", err)
 	}
 
 	if container.Volumes == nil {
-		return fmt.Errorf("Could not find the weavewait volume")
+		return "", fmt.Errorf("Could not find the weavewait volume")
 	}
 
-	volume, ok := container.Volumes["/w"]
+	volume, ok := container.Volumes[v]
 	if !ok {
-		return fmt.Errorf("Could not find the weavewait volume")
+		return "", fmt.Errorf("Could not find the weavewait volume")
 	}
 
-	proxy.weaveWaitVolume = volume
-	return nil
+	return volume, nil
 }
 
 func (proxy *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -178,7 +205,12 @@ func (proxy *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 func (proxy *Proxy) Listen() []net.Listener {
 	listeners := []net.Listener{}
 	proxy.normalisedAddrs = []string{}
+	unixAddrs := []string{}
 	for _, addr := range proxy.ListenAddrs {
+		if strings.HasPrefix(addr, "unix://") || strings.HasPrefix(addr, "/") {
+			unixAddrs = append(unixAddrs, addr)
+			continue
+		}
 		listener, normalisedAddr, err := proxy.listen(addr)
 		if err != nil {
 			Log.Fatalf("Cannot listen on %s: %s", addr, err)
@@ -187,6 +219,20 @@ func (proxy *Proxy) Listen() []net.Listener {
 		proxy.normalisedAddrs = append(proxy.normalisedAddrs, normalisedAddr)
 	}
 
+	if len(unixAddrs) > 0 {
+		listener, _, err := proxy.listen(weaveSockUnix)
+		if err != nil {
+			Log.Fatalf("Cannot listen on %s: %s", weaveSockUnix, err)
+		}
+		listeners = append(listeners, listener)
+
+		if err := proxy.symlink(unixAddrs); err != nil {
+			Log.Fatalf("Cannot listen on unix sockets: %s", err)
+		}
+
+		proxy.normalisedAddrs = append(proxy.normalisedAddrs, weaveSockUnix)
+	}
+
 	for _, addr := range proxy.normalisedAddrs {
 		Log.Infoln("proxy listening on", addr)
 	}
@@ -283,8 +329,10 @@ func (proxy *Proxy) listen(protoAndAddr string) (net.Listener, string, error) {
 		if err != nil {
 			return nil, "", err
 		}
-		if err = copyOwnerAndPermissions(dockerSock, addr); err != nil {
-			return nil, "", err
+		if strings.HasPrefix(proxy.Config.DockerHost, "unix://") {
+			if err = copyOwnerAndPermissions(strings.TrimPrefix(proxy.Config.DockerHost, "unix://"), addr); err != nil {
+				return nil, "", err
+			}
 		}
 
 	default:
@@ -315,7 +363,8 @@ func containerShouldAttach(container *docker.Container) bool {
 }
 
 func containerIsWeaveRouter(container *docker.Container) bool {
-	return len(container.Config.Entrypoint) > 0 && container.Config.Entrypoint[0] == weaveEntrypoint
+	return container.Name == weaveContainerName &&
+		len(container.Config.Entrypoint) > 0 && container.Config.Entrypoint[0] == weaveEntrypoint
 }
 
 func (proxy *Proxy) createWait(r *http.Request, ident string) {
@@ -357,6 +406,24 @@ func (proxy *Proxy) waitForStart(r *http.Request) error {
 	return nil
 }
 
+// If some other operation is waiting for a container to start, join in the wait
+func (proxy *Proxy) waitForStartByIdent(ident string) error {
+	var ch chan error
+	proxy.Lock()
+	for _, wait := range proxy.waiters {
+		if ident == wait.ident && !wait.done {
+			ch = wait.ch
+			break
+		}
+	}
+	proxy.Unlock()
+	if ch != nil {
+		Log.Debugf("Wait for start of container %s", ident)
+		return <-ch
+	}
+	return nil
+}
+
 func (proxy *Proxy) ContainerDied(ident string) {
 }
 
@@ -378,6 +445,9 @@ func (proxy *Proxy) attach(container *docker.Container, orDie bool) error {
 			}
 		}
 	}
+	if proxy.NoMulticastRoute {
+		args = append(args, "--no-multicast-route")
+	}
 	if orDie {
 		args = append(args, "--or-die")
 	}
@@ -406,7 +476,7 @@ func (proxy *Proxy) attachRouter(container *docker.Container) error {
 
 func (proxy *Proxy) weaveCIDRs(networkMode string, env []string) ([]string, error) {
 	if networkMode == "host" || strings.HasPrefix(networkMode, "container:") {
-		return nil, fmt.Errorf("the container was created with the '--net=%s'", networkMode)
+		return nil, fmt.Errorf("the container has '--net=%s'", networkMode)
 	}
 	for _, e := range env {
 		if strings.HasPrefix(e, "WEAVE_CIDR=") {
@@ -422,24 +492,6 @@ func (proxy *Proxy) weaveCIDRs(networkMode string, env []string) ([]string, erro
 	return nil, nil
 }
 
-func (proxy *Proxy) addWeaveWaitVolume(hostConfig jsonObject) error {
-	configBinds, err := hostConfig.StringArray("Binds")
-	if err != nil {
-		return err
-	}
-
-	var binds []string
-	for _, bind := range configBinds {
-		s := strings.Split(bind, ":")
-		if len(s) >= 2 && s[1] == "/w" {
-			continue
-		}
-		binds = append(binds, bind)
-	}
-	hostConfig["Binds"] = append(binds, fmt.Sprintf("%s:/w:ro", proxy.weaveWaitVolume))
-	return nil
-}
-
 func (proxy *Proxy) setWeaveDNS(hostConfig jsonObject, hostname, dnsDomain string) error {
 	dns, err := hostConfig.StringArray("Dns")
 	if err != nil {
@@ -467,10 +519,6 @@ func (proxy *Proxy) getDNSDomain() (domain string) {
 		return ""
 	}
 
-	if proxy.WithDNS {
-		domain = nameserver.DefaultDomain
-	}
-
 	weaveContainer, err := proxy.client.InspectContainer("weave")
 	var weaveIP string
 	if err == nil && weaveContainer.NetworkSettings != nil {
@@ -480,7 +528,7 @@ func (proxy *Proxy) getDNSDomain() (domain string) {
 		weaveIP = "127.0.0.1"
 	}
 
-	url := fmt.Sprintf("http://%s:%d/domain", weaveIP, router.HTTPPort)
+	url := fmt.Sprintf("http://%s:6784/domain", weaveIP)
 	resp, err := http.Get(url)
 	if err != nil || resp.StatusCode != http.StatusOK {
 		return
@@ -494,3 +542,100 @@ func (proxy *Proxy) getDNSDomain() (domain string) {
 
 	return string(b)
 }
+
+func (proxy *Proxy) updateContainerNetworkSettings(container jsonObject) error {
+	containerID, err := container.String("Id")
+	if err != nil {
+		return err
+	}
+
+	if err := proxy.waitForStartByIdent(containerID); err != nil {
+		return err
+	}
+	mac, ips, nets, err := weaveContainerIPs(containerID)
+	if err != nil || len(ips) == 0 {
+		return err
+	}
+
+	networkSettings, err := container.Object("NetworkSettings")
+	if err != nil {
+		return err
+	}
+	networkSettings["MacAddress"] = mac
+	networkSettings["IPAddress"] = ips[0].String()
+	networkSettings["IPPrefixLen"], _ = nets[0].Mask.Size()
+	return nil
+}
+
+func (proxy *Proxy) symlink(unixAddrs []string) (err error) {
+	var container *docker.Container
+	binds := []string{"/var/run/weave:/var/run/weave"}
+	froms := []string{}
+	for _, addr := range unixAddrs {
+		if addr == weaveSockUnix {
+			continue
+		}
+		from := strings.TrimPrefix(addr, "unix://")
+		dir := filepath.Dir(from)
+		binds = append(binds, dir+":"+filepath.Join("/host", dir))
+		froms = append(froms, filepath.Join("/host", from))
+		proxy.normalisedAddrs = append(proxy.normalisedAddrs, addr)
+	}
+	if len(froms) == 0 {
+		return
+	}
+
+	env := []string{
+		"PATH=/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
+	}
+
+	if val := os.Getenv("WEAVE_DEBUG"); val != "" {
+		env = append(env, fmt.Sprintf("%s=%s", "WEAVE_DEBUG", val))
+	}
+
+	container, err = proxy.client.CreateContainer(docker.CreateContainerOptions{
+		Config: &docker.Config{
+			Image:      proxy.Image,
+			Entrypoint: []string{"/home/weave/symlink", weaveSock},
+			Cmd:        froms,
+			Env:        env,
+		},
+		HostConfig: &docker.HostConfig{Binds: binds},
+	})
+	if err != nil {
+		return
+	}
+
+	defer func() {
+		err2 := proxy.client.RemoveContainer(docker.RemoveContainerOptions{ID: container.ID})
+		if err == nil {
+			err = err2
+		}
+	}()
+
+	err = proxy.client.StartContainer(container.ID, nil)
+	if err != nil {
+		return
+	}
+
+	var buf bytes.Buffer
+	err = proxy.client.AttachToContainer(docker.AttachToContainerOptions{
+		Container:   container.ID,
+		ErrorStream: &buf,
+		Logs:        true,
+		Stderr:      true,
+	})
+	if err != nil {
+		return
+	}
+
+	var rc int
+	rc, err = proxy.client.WaitContainer(container.ID)
+	if err != nil {
+		return
+	}
+	if rc != 0 {
+		err = errors.New(buf.String())
+	}
+	return
+}

proxy/start_container_interceptor.go

@@ -2,6 +2,7 @@ package proxy
 
 import (
 	"net/http"
+	"strings"
 )
 
 type startContainerInterceptor struct{ proxy *Proxy }
@@ -31,11 +32,29 @@ func (i *startContainerInterceptor) InterceptRequest(r *http.Request) error {
 			hostConfig = params
 		}
 		if hostConfig != nil {
-			i.proxy.addWeaveWaitVolume(hostConfig)
-			if dnsDomain := i.proxy.getDNSDomain(); dnsDomain != "" {
-				if err := i.proxy.setWeaveDNS(hostConfig, container.Config.Hostname, dnsDomain); err != nil {
+			networkMode, err := jsonObject(hostConfig).String("NetworkMode")
+			if err != nil {
+				return err
+			}
+			if strings.HasPrefix(networkMode, "container:") || networkMode == "host" {
+				if err := addVolume(hostConfig, i.proxy.weaveWaitNoopVolume, "/w", "ro"); err != nil {
 					return err
 				}
+			} else {
+				if i.proxy.NoMulticastRoute {
+					if err := addVolume(hostConfig, i.proxy.weaveWaitNomcastVolume, "/w", "ro"); err != nil {
+						return err
+					}
+				} else {
+					if err := addVolume(hostConfig, i.proxy.weaveWaitVolume, "/w", "ro"); err != nil {
+						return err
+					}
+				}
+				if dnsDomain := i.proxy.getDNSDomain(); dnsDomain != "" {
+					if err := i.proxy.setWeaveDNS(hostConfig, container.Config.Hostname, dnsDomain); err != nil {
+						return err
+					}
+				}
 			}
 
 			// Note we marshal the original top-level dictionary to avoid disturbing anything else

router/consts.go

@@ -1,21 +0,0 @@
-package router
-
-import (
-	"math"
-	"time"
-)
-
-const (
-	Port                = 6783
-	HTTPPort            = Port + 1
-	MaxUDPPacketSize    = 65535
-	ChannelSize         = 16
-	TCPHeartbeat        = 30 * time.Second
-	GossipInterval      = 30 * time.Second
-	MaxDuration         = time.Duration(math.MaxInt64)
-	MaxTCPMsgSize       = 10 * 1024 * 1024
-	FastHeartbeat       = 500 * time.Millisecond
-	SlowHeartbeat       = 10 * time.Second
-	MaxMissedHeartbeats = 6
-	HeartbeatTimeout    = MaxMissedHeartbeats * SlowHeartbeat
-)

router/fastdp.go

@@ -6,9 +6,11 @@ import (
 	"fmt"
 	"net"
 	"sync"
+	"syscall"
 	"time"
 
 	"github.com/weaveworks/go-odp/odp"
+	"github.com/weaveworks/weave/mesh"
 )
 
 // The virtual bridge accepts packets from ODP vports and the router
@@ -39,9 +41,10 @@ type FastDatapath struct {
 	dpif             *odp.Dpif
 	dp               odp.DatapathHandle
 	deleteFlowsCount uint64
+	missCount        uint64
 	missHandlers     map[odp.VportID]missHandler
-	localPeer        *Peer
-	peers            *Peers
+	localPeer        *mesh.Peer
+	peers            *mesh.Peers
 	overlayConsumer  OverlayConsumer
 
 	// Bridge state: How to send to the given bridge port
@@ -62,7 +65,7 @@ type FastDatapath struct {
 	dec *EthernetDecoder
 
 	// forwarders by remote peer
-	forwarders map[PeerName]*fastDatapathForwarder
+	forwarders map[mesh.PeerName]*fastDatapathForwarder
 }
 
 type FastDatapathConfig struct {
@@ -105,9 +108,13 @@ func NewFastDatapath(config FastDatapathConfig) (*FastDatapath, error) {
 		sendToMAC:     make(map[MAC]bridgeSender),
 		seenMACs:      make(map[MAC]struct{}),
 		vxlanVportIDs: make(map[int]odp.VportID),
-		forwarders:    make(map[PeerName]*fastDatapathForwarder),
+		forwarders:    make(map[mesh.PeerName]*fastDatapathForwarder),
 	}
 
+	// This delete happens asynchronously in the kernel, meaning that
+	// we can sometimes fail to recreate the vxlan vport with EADDRINUSE -
+	// consequently we retry a small number of times in
+	// getVxlanVportIDHarder() to compensate.
 	if err := fastdp.deleteVxlanVports(); err != nil {
 		return nil, err
 	}
@@ -124,7 +131,7 @@ func NewFastDatapath(config FastDatapathConfig) (*FastDatapath, error) {
 	// numbers to be independent, but working out how to specify
 	// them on the connecting side.  So we can wait to find out if
 	// anyone wants that.
-	fastdp.mainVxlanVportID, err = fastdp.getVxlanVportID(config.Port + 1)
+	fastdp.mainVxlanVportID, err = fastdp.getVxlanVportIDHarder(config.Port+1, 5, time.Millisecond*10)
 	if err != nil {
 		return nil, err
 	}
@@ -215,8 +222,13 @@ func (fastdp fastDatapathBridge) String() string {
 	return fmt.Sprint(fastdp.dpname, " (via ODP)")
 }
 
-func (fastDatapathBridge) Stats() map[string]int {
-	return nil
+func (fastdp fastDatapathBridge) Stats() map[string]int {
+	lock := fastdp.startLock()
+	defer lock.unlock()
+
+	return map[string]int{
+		"FlowMisses": int(fastdp.missCount),
+	}
 }
 
 var routerBridgePortID = bridgePortID{router: true}
@@ -248,8 +260,7 @@ func (fastdp fastDatapathBridge) InjectPacket(key PacketKey) FlowOp {
 
 // Ethernet bridge implementation
 
-func (fastdp *FastDatapath) bridge(ingress bridgePortID,
-	key PacketKey, lock *fastDatapathLock) FlowOp {
+func (fastdp *FastDatapath) bridge(ingress bridgePortID, key PacketKey, lock *fastDatapathLock) FlowOp {
 	lock.relock()
 	if fastdp.sendToMAC[key.SrcMAC] == nil {
 		// Learn the source MAC
@@ -260,8 +271,7 @@ func (fastdp *FastDatapath) bridge(ingress bridgePortID,
 	// If we know about the destination MAC, deliver it to the
 	// associated port.
 	if sender := fastdp.sendToMAC[key.DstMAC]; sender != nil {
-		return NewMultiFlowOp(false, odpEthernetFlowKey(key),
-			sender(key, lock))
+		return NewMultiFlowOp(false, odpEthernetFlowKey(key), sender(key, lock))
 	}
 
 	// Otherwise, it might be a real broadcast, or it might
@@ -299,7 +309,7 @@ type fastDatapathOverlay struct {
 	*FastDatapath
 }
 
-func (fastdp *FastDatapath) Overlay() Overlay {
+func (fastdp *FastDatapath) Overlay() NetworkOverlay {
 	return fastDatapathOverlay{fastdp}
 }
 
@@ -345,8 +355,7 @@ func (flowStatus *FlowStatus) MarshalJSON() ([]byte, error) {
 		actions = append(actions, fmt.Sprint(action))
 	}
 
-	return json.Marshal(&jsonFlowStatus{flowKeys, actions,
-		flowStatus.Packets, flowStatus.Bytes, flowStatus.Used})
+	return json.Marshal(&jsonFlowStatus{flowKeys, actions, flowStatus.Packets, flowStatus.Bytes, flowStatus.Used})
 }
 
 type VportStatus odp.Vport
@@ -358,8 +367,7 @@ func (vport *VportStatus) MarshalJSON() ([]byte, error) {
 		TypeName string
 	}
 
-	return json.Marshal(&jsonVportStatus{vport.ID, vport.Spec.Name(),
-		vport.Spec.TypeName()})
+	return json.Marshal(&jsonVportStatus{vport.ID, vport.Spec.Name(), vport.Spec.TypeName()})
 }
 
 func (fastdp fastDatapathOverlay) Diagnostics() interface{} {
@@ -367,18 +375,14 @@ func (fastdp fastDatapathOverlay) Diagnostics() interface{} {
 	defer lock.unlock()
 
 	vports, err := fastdp.dp.EnumerateVports()
-	if err != nil {
-		log.Warn(err)
-	}
+	checkWarn(err)
 	vportStatuses := make([]VportStatus, 0, len(vports))
 	for _, vport := range vports {
 		vportStatuses = append(vportStatuses, VportStatus(vport))
 	}
 
 	flows, err := fastdp.dp.EnumerateFlows()
-	if err != nil {
-		log.Warn(err)
-	}
+	checkWarn(err)
 	flowStatuses := make([]FlowStatus, 0, len(flows))
 	for _, flow := range flows {
 		flowStatuses = append(flowStatuses, FlowStatus(flow))
@@ -393,8 +397,7 @@ func (fastdp fastDatapathOverlay) Diagnostics() interface{} {
 	}
 }
 
-func (fastdp fastDatapathOverlay) StartConsumingPackets(localPeer *Peer,
-	peers *Peers, consumer OverlayConsumer) error {
+func (fastdp fastDatapathOverlay) StartConsumingPackets(localPeer *mesh.Peer, peers *mesh.Peers, consumer OverlayConsumer) error {
 	fastdp.lock.Lock()
 	defer fastdp.lock.Unlock()
 
@@ -408,6 +411,20 @@ func (fastdp fastDatapathOverlay) StartConsumingPackets(localPeer *Peer,
 	return nil
 }
 
+func (fastdp *FastDatapath) getVxlanVportIDHarder(udpPort int, retries int, duration time.Duration) (odp.VportID, error) {
+	var vxlanVportID odp.VportID
+	var err error
+	for try := 0; try < retries; try++ {
+		vxlanVportID, err = fastdp.getVxlanVportID(udpPort)
+		if err == nil || err != odp.NetlinkError(syscall.EADDRINUSE) {
+			return vxlanVportID, err
+		}
+		log.Warning("Address already in use creating vxlan vport ", udpPort, " - retrying")
+		time.Sleep(duration)
+	}
+	return 0, err
+}
+
 func (fastdp *FastDatapath) getVxlanVportID(udpPort int) (odp.VportID, error) {
 	fastdp.lock.Lock()
 	defer fastdp.lock.Unlock()
@@ -417,8 +434,7 @@ func (fastdp *FastDatapath) getVxlanVportID(udpPort int) (odp.VportID, error) {
 	}
 
 	vxlanVportID, err := fastdp.dp.CreateVport(
-		odp.NewVxlanVportSpec(fmt.Sprintf("vxlan-%d", udpPort),
-			uint16(udpPort)))
+		odp.NewVxlanVportSpec(fmt.Sprintf("vxlan-%d", udpPort), uint16(udpPort)))
 	if err != nil {
 		return 0, err
 	}
@@ -464,29 +480,27 @@ func (fastdp *FastDatapath) getVxlanVportID(udpPort int) (odp.VportID, error) {
 		tunnelFlowKey.SetIpv4Src(tunKey.Ipv4Src)
 		tunnelFlowKey.SetIpv4Dst(tunKey.Ipv4Dst)
 
-		return NewMultiFlowOp(false, odpFlowKey(tunnelFlowKey),
-			consumer(key))
+		return NewMultiFlowOp(false, odpFlowKey(tunnelFlowKey), consumer(key))
 	}
 
 	return vxlanVportID, nil
 }
 
-func (fastdp *FastDatapath) extractPeers(tunnelID [8]byte) (*Peer, *Peer) {
+func (fastdp *FastDatapath) extractPeers(tunnelID [8]byte) (*mesh.Peer, *mesh.Peer) {
 	vni := binary.BigEndian.Uint64(tunnelID[:])
-	srcPeer := fastdp.peers.FetchByShortID(PeerShortID(vni & 0xfff))
-	dstPeer := fastdp.peers.FetchByShortID(PeerShortID((vni >> 12) & 0xfff))
+	srcPeer := fastdp.peers.FetchByShortID(mesh.PeerShortID(vni & 0xfff))
+	dstPeer := fastdp.peers.FetchByShortID(mesh.PeerShortID((vni >> 12) & 0xfff))
 	return srcPeer, dstPeer
 }
 
 type vxlanSpecialPacketFlowOp struct {
 	NonDiscardingFlowOp
 	fastdp  *FastDatapath
-	srcPeer *Peer
+	srcPeer *mesh.Peer
 	sender  *net.UDPAddr
 }
 
-func (op vxlanSpecialPacketFlowOp) Process(frame []byte, dec *EthernetDecoder,
-	broadcast bool) {
+func (op vxlanSpecialPacketFlowOp) Process(frame []byte, dec *EthernetDecoder, broadcast bool) {
 	op.fastdp.lock.Lock()
 	fwd := op.fastdp.forwarders[op.srcPeer.Name]
 	op.fastdp.lock.Unlock()
@@ -498,7 +512,7 @@ func (op vxlanSpecialPacketFlowOp) Process(frame []byte, dec *EthernetDecoder,
 
 type fastDatapathForwarder struct {
 	fastdp         *FastDatapath
-	remotePeer     *Peer
+	remotePeer     *mesh.Peer
 	localIP        [4]byte
 	sendControlMsg func(byte, []byte) error
 	connUID        uint64
@@ -518,24 +532,23 @@ type fastDatapathForwarder struct {
 	errorChan       chan error
 }
 
-func (fastdp fastDatapathOverlay) MakeForwarder(
-	params ForwarderParams) (OverlayForwarder, error) {
-	if params.Crypto != nil {
-		// No encryption suport in fastdp.  The weaver main.go
-		// is responsible for ensuring this doesn't happen.
-		log.Fatal("Attempt to use FastDatapath with encryption")
+func (fastdp fastDatapathOverlay) PrepareConnection(params mesh.OverlayConnectionParams) (mesh.OverlayConnection, error) {
+	if params.SessionKey != nil {
+		// No encryption support in fastdp
+		return nil, fmt.Errorf("encryption not supported")
 	}
 
 	vxlanVportID := fastdp.mainVxlanVportID
-	remoteAddr := params.RemoteAddr
-	if remoteAddr != nil {
+	var remoteAddr *net.UDPAddr
+
+	if params.Outbound {
+		remoteAddr = makeUDPAddr(params.RemoteAddr)
 		// The provided address contains the main weave port
 		// number to connect to.  We need to derive the vxlan
 		// port number from that.
-		vxlanRemoteAddr := *params.RemoteAddr
+		vxlanRemoteAddr := *remoteAddr
 		vxlanRemoteAddr.Port++
 		remoteAddr = &vxlanRemoteAddr
-
 		var err error
 		vxlanVportID, err = fastdp.getVxlanVportID(remoteAddr.Port)
 		if err != nil {
@@ -543,7 +556,7 @@ func (fastdp fastDatapathOverlay) MakeForwarder(
 		}
 	}
 
-	localIP, err := ipv4Bytes(params.LocalIP)
+	localIP, err := ipv4Bytes(params.LocalAddr.IP)
 	if err != nil {
 		return nil, err
 	}
@@ -674,15 +687,17 @@ func (fwd *fastDatapathForwarder) sendHeartbeat() {
 		DstPeer:   fwd.remotePeer,
 	}
 	fwd.lock.RUnlock()
-	fwd.Forward(pk).Process(buf, dec, false)
+
+	if fop := fwd.Forward(pk); fop != nil {
+		fop.Process(buf, dec, false)
+	}
 }
 
 const (
 	FastDatapathHeartbeatAck = iota
 )
 
-func (fwd *fastDatapathForwarder) handleVxlanSpecialPacket(frame []byte,
-	sender *net.UDPAddr) {
+func (fwd *fastDatapathForwarder) handleVxlanSpecialPacket(frame []byte, sender *net.UDPAddr) {
 	fwd.lock.Lock()
 	defer fwd.lock.Unlock()
 
@@ -706,8 +721,7 @@ func (fwd *fastDatapathForwarder) handleVxlanSpecialPacket(frame []byte,
 			fwd.heartbeatTimer.Reset(0)
 		}
 	} else if !udpAddrsEqual(fwd.remoteAddr, sender) {
-		log.Info(fwd.logPrefix(),
-			"Peer IP address changed to ", sender)
+		log.Info(fwd.logPrefix(), "Peer IP address changed to ", sender)
 		fwd.remoteAddr = sender
 	}
 
@@ -732,8 +746,7 @@ func (fwd *fastDatapathForwarder) ControlMessage(tag byte, msg []byte) {
 		fwd.handleHeartbeatAck()
 
 	default:
-		log.Info(fwd.logPrefix(),
-			"Ignoring unknown control message: ", tag)
+		log.Info(fwd.logPrefix(), "Ignoring unknown control message: ", tag)
 	}
 }
 
@@ -809,8 +822,7 @@ func (fwd *fastDatapathForwarder) Stop() {
 	}
 }
 
-func (fastdp *FastDatapath) addForwarder(peer PeerName,
-	fwd *fastDatapathForwarder) {
+func (fastdp *FastDatapath) addForwarder(peer mesh.PeerName, fwd *fastDatapathForwarder) {
 	fastdp.lock.Lock()
 	defer fastdp.lock.Unlock()
 
@@ -819,8 +831,7 @@ func (fastdp *FastDatapath) addForwarder(peer PeerName,
 	fastdp.forwarders[peer] = fwd
 }
 
-func (fastdp *FastDatapath) removeForwarder(peer PeerName,
-	fwd *fastDatapathForwarder) {
+func (fastdp *FastDatapath) removeForwarder(peer mesh.PeerName, fwd *fastDatapathForwarder) {
 	fastdp.lock.Lock()
 	defer fastdp.lock.Unlock()
 	if fastdp.forwarders[peer] == fwd {
@@ -899,9 +910,7 @@ func (fastdp *FastDatapath) expireFlows() {
 	defer lock.unlock()
 
 	flows, err := fastdp.dp.EnumerateFlows()
-	if err != nil {
-		log.Warn(err)
-	}
+	checkWarn(err)
 
 	for _, flow := range flows {
 		if flow.Used == 0 {
@@ -922,8 +931,7 @@ func (fastdp *FastDatapath) expireFlows() {
 // maintain its MAC->peer table.  We do this by querying the router
 // without an actual packet being involved.  Maybe it's
 // worth devising a more unified approach in the future.
-func (fastdp *FastDatapath) touchFlow(fks odp.FlowKeys,
-	lock *fastDatapathLock) {
+func (fastdp *FastDatapath) touchFlow(fks odp.FlowKeys, lock *fastDatapathLock) {
 	// All the flows we create should have an ingress key, but we
 	// check here just in case we encounter one from somewhere
 	// else.
@@ -953,6 +961,8 @@ func (fastdp *FastDatapath) Miss(packet []byte, fks odp.FlowKeys) error {
 	lock := fastdp.startLock()
 	defer lock.unlock()
 
+	fastdp.missCount++
+
 	handler := fastdp.getMissHandler(ingress)
 	if handler == nil {
 		return nil
@@ -963,8 +973,7 @@ func (fastdp *FastDatapath) Miss(packet []byte, fks odp.FlowKeys) error {
 	// delivery to a local netdev based on the dest MAC),
 	// including the ingress in every flow makes things simpler
 	// in touchFlow.
-	mfop := NewMultiFlowOp(false, handler(fks, &lock),
-		odpFlowKey(odp.NewInPortFlowKey(ingress)))
+	mfop := NewMultiFlowOp(false, handler(fks, &lock), odpFlowKey(odp.NewInPortFlowKey(ingress)))
 	fastdp.send(mfop, packet, &lock)
 	return nil
 }
@@ -1032,8 +1041,7 @@ func (fastdp *FastDatapath) makeBridgeVport(vport odp.Vport) {
 
 	// Packets coming from the netdev are processed by the bridge
 	fastdp.missHandlers[vportID] = func(flowKeys odp.FlowKeys, lock *fastDatapathLock) FlowOp {
-		return fastdp.bridge(bridgePortID{vport: vportID},
-			flowKeysToPacketKey(flowKeys), lock)
+		return fastdp.bridge(bridgePortID{vport: vportID}, flowKeysToPacketKey(flowKeys), lock)
 	}
 }
 
@@ -1044,8 +1052,7 @@ func flowKeysToPacketKey(fks odp.FlowKeys) PacketKey {
 
 // The sendToPort map is read-only, so this method does the copy in
 // order to add an entry.
-func (fastdp *FastDatapath) addSendToPort(portID bridgePortID,
-	sender bridgeSender) {
+func (fastdp *FastDatapath) addSendToPort(portID bridgePortID, sender bridgeSender) {
 	sendToPort := map[bridgePortID]bridgeSender{portID: sender}
 	for id, sender := range fastdp.sendToPort {
 		sendToPort[id] = sender
@@ -1064,8 +1071,7 @@ func (fastdp *FastDatapath) deleteSendToPort(portID bridgePortID) {
 }
 
 // Send a packet, creating a corresponding ODP flow rule if possible
-func (fastdp *FastDatapath) send(fops FlowOp, frame []byte,
-	lock *fastDatapathLock) {
+func (fastdp *FastDatapath) send(fops FlowOp, frame []byte, lock *fastDatapathLock) {
 	// Gather the actions from actionFlowOps, execute any others
 	var dec *EthernetDecoder
 	flow := odp.NewFlowSpec()
@@ -1157,8 +1163,7 @@ func (fop odpActionsFlowOp) updateFlowSpec(flow *odp.FlowSpec) {
 	flow.AddActions(fop.actions)
 }
 
-func (fop odpActionsFlowOp) Process(frame []byte, dec *EthernetDecoder,
-	broadcast bool) {
+func (fop odpActionsFlowOp) Process(frame []byte, dec *EthernetDecoder, broadcast bool) {
 	fastdp := fop.fastdp
 	fastdp.lock.Lock()
 	defer fastdp.lock.Unlock()

router/flow.go

@@ -1,6 +1,10 @@
 package router
 
-import "net"
+import (
+	"net"
+
+	"github.com/weaveworks/weave/mesh"
+)
 
 // Just enough flow machinery for the weave router
 
@@ -16,8 +20,8 @@ type PacketKey struct {
 }
 
 type ForwardPacketKey struct {
-	SrcPeer *Peer
-	DstPeer *Peer
+	SrcPeer *mesh.Peer
+	DstPeer *mesh.Peer
 	PacketKey
 }
 
@@ -64,8 +68,7 @@ func (mfop *MultiFlowOp) Add(op FlowOp) {
 	mfop.ops = append(mfop.ops, op)
 }
 
-func (mfop *MultiFlowOp) Process(frame []byte, dec *EthernetDecoder,
-	broadcast bool) {
+func (mfop *MultiFlowOp) Process(frame []byte, dec *EthernetDecoder, broadcast bool) {
 	for _, op := range mfop.ops {
 		op.Process(frame, dec, mfop.broadcast)
 	}

router/frame_crypto.go

@@ -1,32 +1,13 @@
 package router
 
 import (
-	"crypto/rand"
-	"crypto/sha256"
 	"encoding/binary"
-	"encoding/gob"
 	"fmt"
-	"io"
-	"sync"
 
 	"github.com/andybalholm/go-bit"
-	"golang.org/x/crypto/nacl/box"
 	"golang.org/x/crypto/nacl/secretbox"
 )
 
-func GenerateKeyPair() (publicKey, privateKey *[32]byte, err error) {
-	return box.GenerateKey(rand.Reader)
-}
-
-func FormSessionKey(remotePublicKey, localPrivateKey *[32]byte, secretKey []byte) *[32]byte {
-	var sharedKey [32]byte
-	box.Precompute(&sharedKey, remotePublicKey, localPrivateKey)
-	sharedKeySlice := sharedKey[:]
-	sharedKeySlice = append(sharedKeySlice, secretKey...)
-	sessionKey := sha256.Sum256(sharedKeySlice)
-	return &sessionKey
-}
-
 // Frame Encryptors
 
 type Encryptor interface {
@@ -180,6 +161,10 @@ type PacketDecodingError struct {
 	Desc string
 }
 
+func (pde PacketDecodingError) Error() string {
+	return fmt.Sprint("Failed to decode packet: ", pde.Desc)
+}
+
 func NewNonDecryptor() *NonDecryptor {
 	return &NonDecryptor{}
 }
@@ -297,154 +282,3 @@ func (di *NaClDecryptorInstance) advanceState(seqNo uint64) (int, *bit.Set) {
 		return offset, di.usedOffsets
 	}
 }
-
-// TCP Senders/Receivers
-
-// The lowest 64 bits of the nonce contain the message sequence
-// number. The top most bit indicates the connection polarity at the
-// sender - '1' for outbound; the next indicates protocol type - '1'
-// for TCP. The remaining 126 bits are zero. The polarity is needed so
-// that the two ends of a connection do not use the same nonces; the
-// protocol type so that the TCP and UDP sender nonces are disjoint.
-// This is a requirement of the NaCl Security Model; see
-// http://nacl.cr.yp.to/box.html.
-type TCPCryptoState struct {
-	sessionKey *[32]byte
-	nonce      [24]byte
-	seqNo      uint64
-}
-
-func NewTCPCryptoState(sessionKey *[32]byte, outbound bool) *TCPCryptoState {
-	s := &TCPCryptoState{sessionKey: sessionKey}
-	if outbound {
-		s.nonce[0] |= (1 << 7)
-	}
-	// Ensure that TCP and UDP sequences are disjoint
-	s.nonce[0] |= (1 << 6)
-	return s
-}
-
-func (s *TCPCryptoState) advance() {
-	s.seqNo++
-	binary.BigEndian.PutUint64(s.nonce[16:24], s.seqNo)
-}
-
-type TCPSender interface {
-	Send([]byte) error
-}
-
-type GobTCPSender struct {
-	encoder *gob.Encoder
-}
-
-type LengthPrefixTCPSender struct {
-	writer io.Writer
-}
-
-type EncryptedTCPSender struct {
-	sync.RWMutex
-	sender TCPSender
-	state  *TCPCryptoState
-}
-
-func NewGobTCPSender(encoder *gob.Encoder) *GobTCPSender {
-	return &GobTCPSender{encoder: encoder}
-}
-
-func (sender *GobTCPSender) Send(msg []byte) error {
-	return sender.encoder.Encode(msg)
-}
-
-func NewLengthPrefixTCPSender(writer io.Writer) *LengthPrefixTCPSender {
-	return &LengthPrefixTCPSender{writer: writer}
-}
-
-func (sender *LengthPrefixTCPSender) Send(msg []byte) error {
-	l := len(msg)
-	if l > MaxTCPMsgSize {
-		return fmt.Errorf("outgoing message exceeds maximum size: %d > %d", l, MaxTCPMsgSize)
-	}
-	// We copy the message so we can send it in a single Write
-	// operation, thus making this thread-safe without locking.
-	prefixedMsg := make([]byte, 4+l)
-	binary.BigEndian.PutUint32(prefixedMsg, uint32(l))
-	copy(prefixedMsg[4:], msg)
-	_, err := sender.writer.Write(prefixedMsg)
-	return err
-}
-
-func NewEncryptedTCPSender(sender TCPSender, sessionKey *[32]byte, outbound bool) *EncryptedTCPSender {
-	return &EncryptedTCPSender{sender: sender, state: NewTCPCryptoState(sessionKey, outbound)}
-}
-
-func (sender *EncryptedTCPSender) Send(msg []byte) error {
-	sender.Lock()
-	defer sender.Unlock()
-	encodedMsg := secretbox.Seal(nil, msg, &sender.state.nonce, sender.state.sessionKey)
-	sender.state.advance()
-	return sender.sender.Send(encodedMsg)
-}
-
-type TCPReceiver interface {
-	Receive() ([]byte, error)
-}
-
-type GobTCPReceiver struct {
-	decoder *gob.Decoder
-}
-
-type LengthPrefixTCPReceiver struct {
-	reader io.Reader
-}
-
-type EncryptedTCPReceiver struct {
-	receiver TCPReceiver
-	state    *TCPCryptoState
-}
-
-func NewGobTCPReceiver(decoder *gob.Decoder) *GobTCPReceiver {
-	return &GobTCPReceiver{decoder: decoder}
-}
-
-func (receiver *GobTCPReceiver) Receive() ([]byte, error) {
-	var msg []byte
-	err := receiver.decoder.Decode(&msg)
-	return msg, err
-}
-
-func NewLengthPrefixTCPReceiver(reader io.Reader) *LengthPrefixTCPReceiver {
-	return &LengthPrefixTCPReceiver{reader: reader}
-}
-
-func (receiver *LengthPrefixTCPReceiver) Receive() ([]byte, error) {
-	lenPrefix := make([]byte, 4)
-	if _, err := io.ReadFull(receiver.reader, lenPrefix); err != nil {
-		return nil, err
-	}
-	l := binary.BigEndian.Uint32(lenPrefix)
-	if l > MaxTCPMsgSize {
-		return nil, fmt.Errorf("incoming message exceeds maximum size: %d > %d", l, MaxTCPMsgSize)
-	}
-	msg := make([]byte, l)
-	_, err := io.ReadFull(receiver.reader, msg)
-	return msg, err
-}
-
-func NewEncryptedTCPReceiver(receiver TCPReceiver, sessionKey *[32]byte, outbound bool) *EncryptedTCPReceiver {
-	return &EncryptedTCPReceiver{receiver: receiver, state: NewTCPCryptoState(sessionKey, !outbound)}
-}
-
-func (receiver *EncryptedTCPReceiver) Receive() ([]byte, error) {
-	msg, err := receiver.receiver.Receive()
-	if err != nil {
-		return nil, err
-	}
-
-	decodedMsg, success := secretbox.Open(nil, msg, &receiver.state.nonce, receiver.state.sessionKey)
-	if !success {
-		return nil, fmt.Errorf("Unable to decrypt TCP msg")
-	}
-
-	receiver.state.advance()
-	return decodedMsg, nil
-}

router/http.go

@@ -2,12 +2,13 @@ package router
 
 import (
 	"fmt"
+	"net/http"
+
 	"github.com/gorilla/mux"
 	"github.com/weaveworks/weave/common"
-	"net/http"
 )
 
-func (router *Router) HandleHTTP(muxRouter *mux.Router) {
+func (router *NetworkRouter) HandleHTTP(muxRouter *mux.Router) {
 
 	muxRouter.Methods("POST").Path("/connect").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if err := r.ParseForm(); err != nil {

router/mac_cache.go

@@ -4,11 +4,13 @@ import (
 	"net"
 	"sync"
 	"time"
+
+	"github.com/weaveworks/weave/mesh"
 )
 
 type MacCacheEntry struct {
 	lastSeen time.Time
-	peer     *Peer
+	peer     *mesh.Peer
 }
 
 type MacCache struct {
@@ -16,10 +18,10 @@ type MacCache struct {
 	table       map[uint64]*MacCacheEntry
 	maxAge      time.Duration
 	expiryTimer *time.Timer
-	onExpiry    func(net.HardwareAddr, *Peer)
+	onExpiry    func(net.HardwareAddr, *mesh.Peer)
 }
 
-func NewMacCache(maxAge time.Duration, onExpiry func(net.HardwareAddr, *Peer)) *MacCache {
+func NewMacCache(maxAge time.Duration, onExpiry func(net.HardwareAddr, *mesh.Peer)) *MacCache {
 	cache := &MacCache{
 		table:    make(map[uint64]*MacCacheEntry),
 		maxAge:   maxAge,
@@ -28,7 +30,7 @@ func NewMacCache(maxAge time.Duration, onExpiry func(net.HardwareAddr, *Peer)) *
 	return cache
 }
 
-func (cache *MacCache) add(mac net.HardwareAddr, peer *Peer, force bool) (bool, *Peer) {
+func (cache *MacCache) add(mac net.HardwareAddr, peer *mesh.Peer, force bool) (bool, *mesh.Peer) {
 	key := macint(mac)
 	now := time.Now()
 
@@ -64,15 +66,15 @@ func (cache *MacCache) add(mac net.HardwareAddr, peer *Peer, force bool) (bool,
 	return false, nil
 }
 
-func (cache *MacCache) Add(mac net.HardwareAddr, peer *Peer) (bool, *Peer) {
+func (cache *MacCache) Add(mac net.HardwareAddr, peer *mesh.Peer) (bool, *mesh.Peer) {
 	return cache.add(mac, peer, false)
 }
 
-func (cache *MacCache) AddForced(mac net.HardwareAddr, peer *Peer) (bool, *Peer) {
+func (cache *MacCache) AddForced(mac net.HardwareAddr, peer *mesh.Peer) (bool, *mesh.Peer) {
 	return cache.add(mac, peer, true)
 }
 
-func (cache *MacCache) Lookup(mac net.HardwareAddr) *Peer {
+func (cache *MacCache) Lookup(mac net.HardwareAddr) *mesh.Peer {
 	key := macint(mac)
 	cache.RLock()
 	defer cache.RUnlock()
@@ -83,7 +85,7 @@ func (cache *MacCache) Lookup(mac net.HardwareAddr) *Peer {
 	return entry.peer
 }
 
-func (cache *MacCache) Delete(peer *Peer) bool {
+func (cache *MacCache) Delete(peer *mesh.Peer) bool {
 	found := false
 	cache.Lock()
 	defer cache.Unlock()
@@ -112,3 +114,20 @@ func (cache *MacCache) expire() {
 	}
 	cache.setExpiryTimer()
 }
+
+func macint(mac net.HardwareAddr) (r uint64) {
+	for _, b := range mac {
+		r <<= 8
+		r |= uint64(b)
+	}
+	return
+}
+
+func intmac(key uint64) (r net.HardwareAddr) {
+	r = make([]byte, 6)
+	for i := 5; i >= 0; i-- {
+		r[i] = byte(key)
+		key >>= 8
+	}
+	return
+}

router/network_overlay.go

@@ -0,0 +1,50 @@
+package router
+
+import (
+	"github.com/weaveworks/weave/mesh"
+)
+
+// Interface to overlay network packet handling
+type NetworkOverlay interface {
+	mesh.Overlay
+
+	// The routes have changed, so any cached information should
+	// be discarded.
+	InvalidateRoutes()
+
+	// A mapping of a short id to a peer has changed
+	InvalidateShortIDs()
+
+	// Start consuming forwarded packets.
+	StartConsumingPackets(*mesh.Peer, *mesh.Peers, OverlayConsumer) error
+}
+
+// When a consumer is called, the decoder will already have been used
+// to decode the frame.
+type OverlayConsumer func(ForwardPacketKey) FlowOp
+
+// All of the machinery to forward packets to a particular peer
+type OverlayForwarder interface {
+	mesh.OverlayConnection
+	// Forward a packet across the connection.  May be called as soon
+	// as the overlay connection is created, in particular before
+	// Confirm().  The return value nil means the key could not be
+	// handled by this forwarder.
+	Forward(ForwardPacketKey) FlowOp
+}
+
+type NullNetworkOverlay struct{ mesh.NullOverlay }
+
+func (NullNetworkOverlay) InvalidateRoutes() {
+}
+
+func (NullNetworkOverlay) InvalidateShortIDs() {
+}
+
+func (NullNetworkOverlay) StartConsumingPackets(*mesh.Peer, *mesh.Peers, OverlayConsumer) error {
+	return nil
+}
+
+func (NullNetworkOverlay) Forward(ForwardPacketKey) FlowOp {
+	return DiscardingFlowOp{}
+}

router/network_router.go

@@ -0,0 +1,209 @@
+package router
+
+import (
+	"math"
+	"net"
+	"time"
+
+	"github.com/weaveworks/weave/common"
+	"github.com/weaveworks/weave/mesh"
+)
+
+const (
+	ChannelSize         = 16
+	MaxUDPPacketSize    = 65535
+	FastHeartbeat       = 500 * time.Millisecond
+	SlowHeartbeat       = 10 * time.Second
+	MaxMissedHeartbeats = 6
+	HeartbeatTimeout    = MaxMissedHeartbeats * SlowHeartbeat
+	MaxDuration         = time.Duration(math.MaxInt64)
+	NameSize            = mesh.NameSize
+	// should be greater than typical ARP cache expiries, i.e. > 3/2 *
+	// /proc/sys/net/ipv4_neigh/*/base_reachable_time_ms on Linux
+	macMaxAge = 10 * time.Minute
+)
+
+var (
+	log        = common.Log
+	checkFatal = common.CheckFatal
+	checkWarn  = common.CheckWarn
+)
+
+type NetworkConfig struct {
+	BufSz         int
+	PacketLogging PacketLogging
+	Bridge        Bridge
+}
+
+type PacketLogging interface {
+	LogPacket(string, PacketKey)
+	LogForwardPacket(string, ForwardPacketKey)
+}
+
+type NetworkRouter struct {
+	*mesh.Router
+	NetworkConfig
+	Macs *MacCache
+}
+
+func NewNetworkRouter(config mesh.Config, networkConfig NetworkConfig, name mesh.PeerName, nickName string, overlay NetworkOverlay) *NetworkRouter {
+	if overlay == nil {
+		overlay = NullNetworkOverlay{}
+	}
+	if networkConfig.Bridge == nil {
+		networkConfig.Bridge = NullBridge{}
+	}
+
+	router := &NetworkRouter{Router: mesh.NewRouter(config, name, nickName, overlay), NetworkConfig: networkConfig}
+	router.Peers.OnInvalidateShortIDs(overlay.InvalidateShortIDs)
+	router.Routes.OnChange(overlay.InvalidateRoutes)
+	router.Macs = NewMacCache(macMaxAge,
+		func(mac net.HardwareAddr, peer *mesh.Peer) {
+			log.Println("Expired MAC", mac, "at", peer)
+		})
+	router.Peers.OnGC(func(peer *mesh.Peer) { router.Macs.Delete(peer) })
+	return router
+}
+
+// Start listening for TCP connections, locally captured packets, and
+// forwarded packets.
+func (router *NetworkRouter) Start() {
+	log.Println("Sniffing traffic on", router.Bridge)
+	checkFatal(router.Bridge.StartConsumingPackets(router.handleCapturedPacket))
+	checkFatal(router.Overlay.(NetworkOverlay).StartConsumingPackets(router.Ourself.Peer, router.Peers, router.handleForwardedPacket))
+	router.Router.Start()
+}
+
+func (router *NetworkRouter) handleCapturedPacket(key PacketKey) FlowOp {
+	router.PacketLogging.LogPacket("Captured", key)
+	srcMac := net.HardwareAddr(key.SrcMAC[:])
+
+	switch newSrcMac, conflictPeer := router.Macs.Add(srcMac, router.Ourself.Peer); {
+	case newSrcMac:
+		log.Println("Discovered local MAC", srcMac)
+
+	case conflictPeer != nil:
+		// The MAC cache has an entry for the source MAC
+		// associated with another peer.  This probably means
+		// we are seeing a frame we injected ourself.  That
+		// shouldn't happen, but discard it just in case.
+		log.Error("Captured frame from MAC (", srcMac, ") associated with another peer ", conflictPeer)
+		return DiscardingFlowOp{}
+	}
+
+	// Discard STP broadcasts
+	if key.DstMAC == [...]byte{0x01, 0x80, 0xC2, 0x00, 0x00, 0x00} {
+		return DiscardingFlowOp{}
+	}
+
+	dstMac := net.HardwareAddr(key.DstMAC[:])
+	switch dstPeer := router.Macs.Lookup(dstMac); dstPeer {
+	case router.Ourself.Peer:
+		// The packet is destined for a local MAC.  The bridge
+		// won't normally send us such packets, and if it does
+		// it's likely to be broadcasting the packet to all
+		// ports.  So if it happens, just drop the packet to
+		// avoid warnings if we try to forward it.
+		return DiscardingFlowOp{}
+	case nil:
+		// If we don't know which peer corresponds to the dest
+		// MAC, broadcast it.
+		router.PacketLogging.LogPacket("Broadcasting", key)
+		return router.relayBroadcast(router.Ourself.Peer, key)
+	default:
+		router.PacketLogging.LogPacket("Forwarding", key)
+		return router.relay(ForwardPacketKey{
+			PacketKey: key,
+			SrcPeer:   router.Ourself.Peer,
+			DstPeer:   dstPeer})
+	}
+}
+
+func (router *NetworkRouter) handleForwardedPacket(key ForwardPacketKey) FlowOp {
+	if key.DstPeer != router.Ourself.Peer {
+		// it's not for us, we're just relaying it
+		router.PacketLogging.LogForwardPacket("Relaying", key)
+		return router.relay(key)
+	}
+
+	// At this point, it's either unicast to us, or a broadcast
+	// (because the DstPeer on a forwarded broadcast packet is
+	// always set to the peer being forwarded to)
+
+	srcMac := net.HardwareAddr(key.SrcMAC[:])
+	dstMac := net.HardwareAddr(key.DstMAC[:])
+
+	switch newSrcMac, conflictPeer := router.Macs.AddForced(srcMac, key.SrcPeer); {
+	case newSrcMac:
+		log.Print("Discovered remote MAC ", srcMac, " at ", key.SrcPeer)
+
+	case conflictPeer != nil:
+		log.Print("Discovered remote MAC ", srcMac, " at ", key.SrcPeer, " (was at ", conflictPeer, ")")
+
+		// We need to clear out any flows destined to the MAC
+		// that forward to the old peer.
+		router.Overlay.(NetworkOverlay).InvalidateRoutes()
+	}
+
+	router.PacketLogging.LogForwardPacket("Injecting", key)
+	injectFop := router.Bridge.InjectPacket(key.PacketKey)
+	dstPeer := router.Macs.Lookup(dstMac)
+	if dstPeer == router.Ourself.Peer {
+		return injectFop
+	}
+
+	router.PacketLogging.LogForwardPacket("Relaying broadcast", key)
+	relayFop := router.relayBroadcast(key.SrcPeer, key.PacketKey)
+	switch {
+	case injectFop == nil:
+		return relayFop
+
+	case relayFop == nil:
+		return injectFop
+
+	default:
+		mfop := NewMultiFlowOp(false)
+		mfop.Add(injectFop)
+		mfop.Add(relayFop)
+		return mfop
+	}
+}
+
+// Routing
+
+func (router *NetworkRouter) relay(key ForwardPacketKey) FlowOp {
+	relayPeerName, found := router.Routes.Unicast(key.DstPeer.Name)
+	if !found {
+		// Not necessarily an error as there could be a race with the
+		// dst disappearing whilst the frame is in flight
+		log.Println("Received packet for unknown destination:", key.DstPeer)
+		return DiscardingFlowOp{}
+	}
+
+	conn, found := router.Ourself.ConnectionTo(relayPeerName)
+	if !found {
+		// Again, could just be a race, not necessarily an error
+		log.Println("Unable to find connection to relay peer", relayPeerName)
+		return DiscardingFlowOp{}
+	}
+
+	return conn.(*mesh.LocalConnection).OverlayConn.(OverlayForwarder).Forward(key)
+}
+
+func (router *NetworkRouter) relayBroadcast(srcPeer *mesh.Peer, key PacketKey) FlowOp {
+	nextHops := router.Routes.Broadcast(srcPeer.Name)
+	if len(nextHops) == 0 {
+		return DiscardingFlowOp{}
+	}
+
+	op := NewMultiFlowOp(true)
+
+	for _, conn := range router.Ourself.ConnectionsTo(nextHops) {
+		op.Add(conn.(*mesh.LocalConnection).OverlayConn.(OverlayForwarder).Forward(ForwardPacketKey{
+			PacketKey: key,
+			SrcPeer:   srcPeer,
+			DstPeer:   conn.Remote()}))
+	}
+
+	return op
+}

router/network_router_status.go

@@ -0,0 +1,45 @@
+package router
+
+import (
+	"time"
+
+	"github.com/weaveworks/weave/mesh"
+)
+
+type NetworkRouterStatus struct {
+	*mesh.Status
+	Interface    string
+	CaptureStats map[string]int
+	MACs         []MACStatus
+}
+
+type MACStatus struct {
+	Mac      string
+	Name     string
+	NickName string
+	LastSeen time.Time
+}
+
+func NewNetworkRouterStatus(router *NetworkRouter) *NetworkRouterStatus {
+	return &NetworkRouterStatus{
+		mesh.NewStatus(router.Router),
+		router.Bridge.String(),
+		router.Bridge.Stats(),
+		NewMACStatusSlice(router.Macs)}
+}
+
+func NewMACStatusSlice(cache *MacCache) []MACStatus {
+	cache.RLock()
+	defer cache.RUnlock()
+
+	var slice []MACStatus
+	for key, entry := range cache.table {
+		slice = append(slice, MACStatus{
+			intmac(key).String(),
+			entry.peer.Name.String(),
+			entry.peer.NickName,
+			entry.lastSeen})
+	}
+
+	return slice
+}

router/odp.go

@@ -1,60 +0,0 @@
-package router
-
-import (
-	"github.com/weaveworks/go-odp/odp"
-)
-
-// ODP admin functionality
-
-func CreateDatapath(dpname string) error {
-	dpif, err := odp.NewDpif()
-	if err != nil {
-		return err
-	}
-
-	defer dpif.Close()
-
-	_, err = dpif.CreateDatapath(dpname)
-	if err != nil && !odp.IsDatapathNameAlreadyExistsError(err) {
-		return err
-	}
-
-	return nil
-}
-
-func DeleteDatapath(dpname string) error {
-	dpif, err := odp.NewDpif()
-	if err != nil {
-		return err
-	}
-
-	defer dpif.Close()
-
-	dp, err := dpif.LookupDatapath(dpname)
-	if err != nil {
-		if odp.IsNoSuchDatapathError(err) {
-			return nil
-		}
-
-		return err
-	}
-
-	return dp.Delete()
-}
-
-func AddDatapathInterface(dpname string, ifname string) error {
-	dpif, err := odp.NewDpif()
-	if err != nil {
-		return err
-	}
-
-	defer dpif.Close()
-
-	dp, err := dpif.LookupDatapath(dpname)
-	if err != nil {
-		return err
-	}
-
-	_, err = dp.CreateVport(odp.NewNetdevVportSpec(ifname))
-	return err
-}

router/overlay.go

@@ -1,146 +0,0 @@
-package router
-
-import (
-	"net"
-)
-
-// Interface to overlay network packet handling
-type Overlay interface {
-	// Start consuming forwarded packets.
-	StartConsumingPackets(*Peer, *Peers, OverlayConsumer) error
-
-	// Form a packet-forwarding connection.
-	MakeForwarder(ForwarderParams) (OverlayForwarder, error)
-
-	// The routes have changed, so any cached information should
-	// be discarded.
-	InvalidateRoutes()
-
-	// A mapping of a short id to a peer has changed
-	InvalidateShortIDs()
-
-	// Enhance a features map with overlay-related features
-	AddFeaturesTo(map[string]string)
-
-	// Obtain diagnostic information specific to the overlay
-	Diagnostics() interface{}
-}
-
-type ForwarderParams struct {
-	RemotePeer *Peer
-
-	// The local IP address to use for sending.  Derived from the
-	// local address of the corresponding TCP socket, so may
-	// differ for different forwarders.
-	LocalIP net.IP
-
-	// The remote address to send to.  nil if unknown, i.e. an
-	// incoming connection, in which case the Overlay needs to
-	// discover it (e.g. from incoming datagrams).
-	RemoteAddr *net.UDPAddr
-
-	// Unique identifier for this connection
-	ConnUID uint64
-
-	// Crypto bits.  Nil if not encrypting
-	Crypto *OverlayCrypto
-
-	// Function to send a control message to the counterpart
-	// forwarder.
-	SendControlMessage func(tag byte, msg []byte) error
-
-	// Features passed at connection initiation
-	Features map[string]string
-}
-
-// When a consumer is called, the decoder will already have been used
-// to decode the frame.
-type OverlayConsumer func(ForwardPacketKey) FlowOp
-
-// Crypto settings for a forwarder.
-type OverlayCrypto struct {
-	Dec   Decryptor
-	Enc   Encryptor
-	EncDF Encryptor
-}
-
-// All of the machinery to forward packets to a particular peer
-type OverlayForwarder interface {
-	// Forward a packet across the connection.  May be called as
-	// soon as the forwarder is created, in particular before
-	// Confirm().  The return value nil means the key could not be
-	// handled by this forwarder.
-	Forward(ForwardPacketKey) FlowOp
-
-	// Confirm that the connection is really wanted, and so the
-	// Overlay should begin heartbeats etc. to verify the
-	// operation of the forwarder.
-	Confirm()
-
-	// A channel indicating that the forwarder is established,
-	// i.e. its operation has been confirmed.
-	EstablishedChannel() <-chan struct{}
-
-	// A channel indicating an error from the forwarder.  The
-	// forwarder is not expected to be operational after the first
-	// error, so the channel only needs to buffer a single error.
-	ErrorChannel() <-chan error
-
-	Stop()
-
-	// Handle a message from the peer.  'tag' exists for
-	// compatibility, and should always be
-	// ProtocolOverlayControlMessage for non-sleeve overlays.
-	ControlMessage(tag byte, msg []byte)
-
-	// User facing overlay name
-	DisplayName() string
-}
-
-type NullOverlay struct{}
-
-func (NullOverlay) StartConsumingPackets(*Peer, *Peers, OverlayConsumer) error {
-	return nil
-}
-
-func (NullOverlay) MakeForwarder(ForwarderParams) (OverlayForwarder, error) {
-	return NullOverlay{}, nil
-}
-
-func (NullOverlay) InvalidateRoutes() {
-}
-
-func (NullOverlay) InvalidateShortIDs() {
-}
-
-func (NullOverlay) Confirm() {
-}
-
-func (NullOverlay) EstablishedChannel() <-chan struct{} {
-	return nil
-}
-
-func (NullOverlay) ErrorChannel() <-chan error {
-	return nil
-}
-
-func (NullOverlay) AddFeaturesTo(map[string]string) {
-}
-
-func (NullOverlay) Forward(ForwardPacketKey) FlowOp {
-	return DiscardingFlowOp{}
-}
-
-func (NullOverlay) Stop() {
-}
-
-func (NullOverlay) ControlMessage(byte, []byte) {
-}
-
-func (NullOverlay) DisplayName() string {
-	return "null"
-}
-
-func (NullOverlay) Diagnostics() interface{} {
-	return nil
-}

router/overlay_switch.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"strings"
 	"sync"
+
+	"github.com/weaveworks/weave/mesh"
 )
 
 // OverlaySwitch selects which overlay to use, from a set of
@@ -13,16 +15,16 @@ import (
 // uses the best one that seems to be working.
 
 type OverlaySwitch struct {
-	overlays      map[string]Overlay
+	overlays      map[string]NetworkOverlay
 	overlayNames  []string
-	compatOverlay Overlay
+	compatOverlay NetworkOverlay
 }
 
 func NewOverlaySwitch() *OverlaySwitch {
-	return &OverlaySwitch{overlays: make(map[string]Overlay)}
+	return &OverlaySwitch{overlays: make(map[string]NetworkOverlay)}
 }
 
-func (osw *OverlaySwitch) Add(name string, overlay Overlay) {
+func (osw *OverlaySwitch) Add(name string, overlay NetworkOverlay) {
 	// check for repeated names
 	if _, present := osw.overlays[name]; present {
 		log.Fatal("OverlaySwitch: repeated overlay name")
@@ -32,7 +34,7 @@ func (osw *OverlaySwitch) Add(name string, overlay Overlay) {
 	osw.overlayNames = append(osw.overlayNames, name)
 }
 
-func (osw *OverlaySwitch) SetCompatOverlay(overlay Overlay) {
+func (osw *OverlaySwitch) SetCompatOverlay(overlay NetworkOverlay) {
 	osw.compatOverlay = overlay
 }
 
@@ -60,11 +62,9 @@ func (osw *OverlaySwitch) InvalidateShortIDs() {
 	}
 }
 
-func (osw *OverlaySwitch) StartConsumingPackets(localPeer *Peer, peers *Peers,
-	consumer OverlayConsumer) error {
+func (osw *OverlaySwitch) StartConsumingPackets(localPeer *mesh.Peer, peers *mesh.Peers, consumer OverlayConsumer) error {
 	for _, overlay := range osw.overlays {
-		if err := overlay.StartConsumingPackets(localPeer, peers,
-			consumer); err != nil {
+		if err := overlay.StartConsumingPackets(localPeer, peers, consumer); err != nil {
 			return err
 		}
 	}
@@ -72,19 +72,19 @@ func (osw *OverlaySwitch) StartConsumingPackets(localPeer *Peer, peers *Peers,
 }
 
 type namedOverlay struct {
-	Overlay
+	NetworkOverlay
 	name string
 }
 
 // Find the common set of overlays supported by both sides, with the
 // ordering being the same on both sides too.
-func (osw *OverlaySwitch) commonOverlays(params ForwarderParams) ([]namedOverlay, error) {
+func (osw *OverlaySwitch) commonOverlays(params mesh.OverlayConnectionParams) ([]namedOverlay, error) {
 	var peerOverlays []string
 	if overlaysFeature, present := params.Features["Overlays"]; present {
 		peerOverlays = strings.Split(overlaysFeature, " ")
 	}
 
-	common := make(map[string]Overlay)
+	common := make(map[string]NetworkOverlay)
 	for _, name := range peerOverlays {
 		if overlay := osw.overlays[name]; overlay != nil {
 			common[name] = overlay
@@ -120,7 +120,7 @@ func (osw *OverlaySwitch) commonOverlays(params ForwarderParams) ([]namedOverlay
 }
 
 type overlaySwitchForwarder struct {
-	remotePeer *Peer
+	remotePeer *mesh.Peer
 
 	lock sync.Mutex
 
@@ -162,10 +162,9 @@ type subForwarderEvent struct {
 	err error
 }
 
-func (osw *OverlaySwitch) MakeForwarder(
-	params ForwarderParams) (OverlayForwarder, error) {
+func (osw *OverlaySwitch) PrepareConnection(params mesh.OverlayConnectionParams) (mesh.OverlayConnection, error) {
 	if _, present := params.Features["Overlays"]; !present && osw.compatOverlay != nil {
-		return osw.compatOverlay.MakeForwarder(params)
+		return osw.compatOverlay.PrepareConnection(params)
 	}
 
 	overlays, err := osw.commonOverlays(params)
@@ -200,15 +199,23 @@ func (osw *OverlaySwitch) MakeForwarder(
 			xmsg[0] = byte(index)
 			xmsg[1] = tag
 			copy(xmsg[2:], msg)
-			return origSendControlMessage(ProtocolOverlayControlMsg,
-				xmsg)
+			return origSendControlMessage(mesh.ProtocolOverlayControlMsg, xmsg)
 		}
 
-		subFwd, err := overlay.MakeForwarder(params)
+		subConn, err := overlay.PrepareConnection(params)
 		if err != nil {
-			fwd.stopFrom(0)
-			return nil, err
+			log.Infof("Unable to use %s for connection to %s(%s): %s",
+				overlay.name,
+				params.RemotePeer.Name,
+				params.RemotePeer.NickName,
+				err)
+			// failed to start subforwarder - record overlay name and continue
+			fwd.forwarders[i] = subForwarder{
+				overlayName: overlay.name,
+			}
+			continue
 		}
+		subFwd := subConn.(OverlayForwarder)
 
 		subStopChan := make(chan struct{})
 		go monitorForwarder(i, eventsChan, subStopChan, subFwd)
@@ -224,8 +231,7 @@ func (osw *OverlaySwitch) MakeForwarder(
 	return fwd, nil
 }
 
-func monitorForwarder(index int, eventsChan chan<- subForwarderEvent,
-	stopChan <-chan struct{}, fwd OverlayForwarder) {
+func monitorForwarder(index int, eventsChan chan<- subForwarderEvent, stopChan <-chan struct{}, fwd OverlayForwarder) {
 	establishedChan := fwd.EstablishedChannel()
 loop:
 	for {
@@ -257,8 +263,7 @@ loop:
 	fwd.Stop()
 }
 
-func (fwd *overlaySwitchForwarder) run(eventsChan <-chan subForwarderEvent,
-	stopChan <-chan struct{}) {
+func (fwd *overlaySwitchForwarder) run(eventsChan <-chan subForwarderEvent, stopChan <-chan struct{}) {
 loop:
 	for {
 		select {
@@ -355,8 +360,7 @@ func (fwd *overlaySwitchForwarder) chooseBest() {
 
 	if fwd.best != best {
 		fwd.best = best
-		log.Info(fwd.logPrefix(),
-			"using ", fwd.forwarders[best].overlayName)
+		log.Info(fwd.logPrefix(), "using ", fwd.forwarders[best].overlayName)
 	}
 }
 

router/router.go

@@ -1,337 +0,0 @@
-package router
-
-import (
-	"fmt"
-	"net"
-	"sync"
-	"time"
-)
-
-const (
-	macMaxAge        = 10 * time.Minute       // [1]
-	acceptMaxTokens  = 100                    // [2]
-	acceptTokenDelay = 100 * time.Millisecond // [3]
-)
-
-// [1] should be greater than typical ARP cache expiries, i.e. > 3/2 *
-// /proc/sys/net/ipv4_neigh/*/base_reachable_time_ms on Linux
-
-// [2] capacity of token bucket for rate limiting accepts
-
-// [3] control rate at which new tokens are added to the bucket
-
-type Config struct {
-	Port               int
-	ProtocolMinVersion byte
-	Password           []byte
-	ConnLimit          int
-	PeerDiscovery      bool
-	BufSz              int
-	PacketLogging      PacketLogging
-	Bridge             Bridge
-	Overlay            Overlay
-}
-
-type PacketLogging interface {
-	LogPacket(string, PacketKey)
-	LogForwardPacket(string, ForwardPacketKey)
-}
-
-type Router struct {
-	Config
-	Ourself         *LocalPeer
-	Macs            *MacCache
-	Peers           *Peers
-	Routes          *Routes
-	ConnectionMaker *ConnectionMaker
-	gossipLock      sync.RWMutex
-	gossipChannels  GossipChannels
-	TopologyGossip  Gossip
-	UDPListener     *net.UDPConn
-	acceptLimiter   *TokenBucket
-}
-
-func NewRouter(config Config, name PeerName, nickName string) *Router {
-	router := &Router{Config: config, gossipChannels: make(GossipChannels)}
-
-	if router.Bridge == nil {
-		router.Bridge = NullBridge{}
-	}
-
-	if router.Overlay == nil {
-		router.Overlay = NullOverlay{}
-	}
-
-	router.Ourself = NewLocalPeer(name, nickName, router)
-	router.Macs = NewMacCache(macMaxAge,
-		func(mac net.HardwareAddr, peer *Peer) {
-			log.Println("Expired MAC", mac, "at", peer)
-		})
-	router.Peers = NewPeers(router.Ourself)
-	router.Peers.OnGC(func(peer *Peer) {
-		router.Macs.Delete(peer)
-		log.Println("Removed unreachable peer", peer)
-	})
-	router.Peers.OnInvalidateShortIDs(router.Overlay.InvalidateShortIDs)
-
-	router.Routes = NewRoutes(router.Ourself, router.Peers, router.Overlay.InvalidateRoutes)
-	router.ConnectionMaker = NewConnectionMaker(router.Ourself, router.Peers, router.Port, router.PeerDiscovery)
-	router.TopologyGossip = router.NewGossip("topology", router)
-	router.acceptLimiter = NewTokenBucket(acceptMaxTokens, acceptTokenDelay)
-	return router
-}
-
-// Start listening for TCP connections, locally captured packets, and
-// forwarded packets.  This is separate from NewRouter so
-// that gossipers can register before we start forming connections.
-func (router *Router) Start() {
-	log.Println("Sniffing traffic on", router.Bridge)
-	checkFatal(router.Bridge.StartConsumingPackets(router.handleCapturedPacket))
-	checkFatal(router.Overlay.StartConsumingPackets(router.Ourself.Peer, router.Peers, router.handleForwardedPacket))
-	router.listenTCP(router.Port)
-}
-
-func (router *Router) Stop() error {
-	// TODO: perform graceful shutdown...
-	return nil
-}
-
-func (router *Router) UsingPassword() bool {
-	return router.Password != nil
-}
-
-func (router *Router) handleCapturedPacket(key PacketKey) FlowOp {
-	router.PacketLogging.LogPacket("Captured", key)
-	srcMac := net.HardwareAddr(key.SrcMAC[:])
-
-	switch newSrcMac, conflictPeer := router.Macs.Add(srcMac, router.Ourself.Peer); {
-	case newSrcMac:
-		log.Println("Discovered local MAC", srcMac)
-
-	case conflictPeer != nil:
-		// The MAC cache has an entry for the source MAC
-		// associated with another peer.  This probably means
-		// we are seeing a frame we injected ourself.  That
-		// shouldn't happen, but discard it just in case.
-		log.Error("Captured frame from MAC (", srcMac, ") associated with another peer ", conflictPeer)
-		return DiscardingFlowOp{}
-	}
-
-	// Discard STP broadcasts
-	if key.DstMAC == [...]byte{0x01, 0x80, 0xC2, 0x00, 0x00, 0x00} {
-		return DiscardingFlowOp{}
-	}
-
-	dstMac := net.HardwareAddr(key.DstMAC[:])
-	switch dstPeer := router.Macs.Lookup(dstMac); dstPeer {
-	case router.Ourself.Peer:
-		// The packet is destined for a local MAC.  The bridge
-		// won't normally send us such packets, and if it does
-		// it's likely to be broadcasting the packet to all
-		// ports.  So if it happens, just drop the packet to
-		// avoid warnings if we try to forward it.
-		return DiscardingFlowOp{}
-	case nil:
-		// If we don't know which peer corresponds to the dest
-		// MAC, broadcast it.
-		router.PacketLogging.LogPacket("Broadcasting", key)
-		return router.relayBroadcast(router.Ourself.Peer, key)
-	default:
-		router.PacketLogging.LogPacket("Forwarding", key)
-		return router.relay(ForwardPacketKey{
-			PacketKey: key,
-			SrcPeer:   router.Ourself.Peer,
-			DstPeer:   dstPeer})
-	}
-}
-
-func (router *Router) listenTCP(localPort int) {
-	localAddr, err := net.ResolveTCPAddr("tcp4", fmt.Sprint(":", localPort))
-	checkFatal(err)
-	ln, err := net.ListenTCP("tcp4", localAddr)
-	checkFatal(err)
-	go func() {
-		defer ln.Close()
-		for {
-			tcpConn, err := ln.AcceptTCP()
-			if err != nil {
-				log.Errorln(err)
-				continue
-			}
-			router.acceptTCP(tcpConn)
-			router.acceptLimiter.Wait()
-		}
-	}()
-}
-
-func (router *Router) acceptTCP(tcpConn *net.TCPConn) {
-	// someone else is dialing us, so our udp sender is the conn
-	// on router.Port and we wait for them to send us something on UDP to
-	// start.
-	remoteAddrStr := tcpConn.RemoteAddr().String()
-	log.Printf("->[%s] connection accepted", remoteAddrStr)
-	connRemote := NewRemoteConnection(router.Ourself.Peer, nil, remoteAddrStr, false, false)
-	StartLocalConnection(connRemote, tcpConn, nil, router, true)
-}
-
-func (router *Router) handleForwardedPacket(key ForwardPacketKey) FlowOp {
-	if key.DstPeer != router.Ourself.Peer {
-		// it's not for us, we're just relaying it
-		router.PacketLogging.LogForwardPacket("Relaying", key)
-		return router.relay(key)
-	}
-
-	// At this point, it's either unicast to us, or a broadcast
-	// (because the DstPeer on a forwarded broadcast packet is
-	// always set to the peer being forwarded to)
-
-	srcMac := net.HardwareAddr(key.SrcMAC[:])
-	dstMac := net.HardwareAddr(key.DstMAC[:])
-
-	switch newSrcMac, conflictPeer := router.Macs.AddForced(srcMac, key.SrcPeer); {
-	case newSrcMac:
-		log.Print("Discovered remote MAC ", srcMac, " at ", key.SrcPeer)
-
-	case conflictPeer != nil:
-		log.Print("Discovered remote MAC ", srcMac, " at ", key.SrcPeer, " (was at ", conflictPeer, ")")
-
-		// We need to clear out any flows destined to the MAC
-		// that forward to the old peer.
-		router.Overlay.InvalidateRoutes()
-	}
-
-	router.PacketLogging.LogForwardPacket("Injecting", key)
-	injectFop := router.Bridge.InjectPacket(key.PacketKey)
-	dstPeer := router.Macs.Lookup(dstMac)
-	if dstPeer == router.Ourself.Peer {
-		return injectFop
-	}
-
-	router.PacketLogging.LogForwardPacket("Relaying broadcast", key)
-	relayFop := router.relayBroadcast(key.SrcPeer, key.PacketKey)
-	switch {
-	case injectFop == nil:
-		return relayFop
-
-	case relayFop == nil:
-		return injectFop
-
-	default:
-		mfop := NewMultiFlowOp(false)
-		mfop.Add(injectFop)
-		mfop.Add(relayFop)
-		return mfop
-	}
-}
-
-// Routing
-
-func (router *Router) relay(key ForwardPacketKey) FlowOp {
-	relayPeerName, found := router.Routes.Unicast(key.DstPeer.Name)
-	if !found {
-		// Not necessarily an error as there could be a race with the
-		// dst disappearing whilst the frame is in flight
-		log.Println("Received packet for unknown destination:", key.DstPeer)
-		return DiscardingFlowOp{}
-	}
-
-	conn, found := router.Ourself.ConnectionTo(relayPeerName)
-	if !found {
-		// Again, could just be a race, not necessarily an error
-		log.Println("Unable to find connection to relay peer", relayPeerName)
-		return DiscardingFlowOp{}
-	}
-
-	return conn.(*LocalConnection).Forward(key)
-}
-
-func (router *Router) relayBroadcast(srcPeer *Peer, key PacketKey) FlowOp {
-	nextHops := router.Routes.Broadcast(srcPeer.Name)
-	if len(nextHops) == 0 {
-		return DiscardingFlowOp{}
-	}
-
-	op := NewMultiFlowOp(true)
-
-	for _, conn := range router.Ourself.ConnectionsTo(nextHops) {
-		op.Add(conn.(*LocalConnection).Forward(ForwardPacketKey{
-			PacketKey: key,
-			SrcPeer:   srcPeer,
-			DstPeer:   conn.Remote()}))
-	}
-
-	return op
-}
-
-// Gossiper methods - the Router is the topology Gossiper
-
-type TopologyGossipData struct {
-	peers  *Peers
-	update PeerNameSet
-}
-
-func (router *Router) BroadcastTopologyUpdate(update []*Peer) {
-	names := make(PeerNameSet)
-	for _, p := range update {
-		names[p.Name] = void
-	}
-
-	router.TopologyGossip.GossipBroadcast(&TopologyGossipData{
-		peers:  router.Peers,
-		update: names,
-	})
-}
-
-func (d *TopologyGossipData) Merge(other GossipData) {
-	for name := range other.(*TopologyGossipData).update {
-		d.update[name] = void
-	}
-}
-
-func (d *TopologyGossipData) Encode() [][]byte {
-	return [][]byte{d.peers.EncodePeers(d.update)}
-}
-
-func (router *Router) OnGossipUnicast(sender PeerName, msg []byte) error {
-	return fmt.Errorf("unexpected topology gossip unicast: %v", msg)
-}
-
-func (router *Router) OnGossipBroadcast(_ PeerName, update []byte) (GossipData, error) {
-	origUpdate, _, err := router.applyTopologyUpdate(update)
-	if err != nil || len(origUpdate) == 0 {
-		return nil, err
-	}
-	return &TopologyGossipData{peers: router.Peers, update: origUpdate}, nil
-}
-
-func (router *Router) Gossip() GossipData {
-	return &TopologyGossipData{peers: router.Peers, update: router.Peers.Names()}
-}
-
-func (router *Router) OnGossip(update []byte) (GossipData, error) {
-	_, newUpdate, err := router.applyTopologyUpdate(update)
-	if err != nil || len(newUpdate) == 0 {
-		return nil, err
-	}
-	return &TopologyGossipData{peers: router.Peers, update: newUpdate}, nil
-}
-
-func (router *Router) applyTopologyUpdate(update []byte) (PeerNameSet, PeerNameSet, error) {
-	origUpdate, newUpdate, err := router.Peers.ApplyUpdate(update)
-	if _, ok := err.(UnknownPeerError); err != nil && ok {
-		// That update contained a reference to a peer which wasn't
-		// itself included in the update, and we didn't know about
-		// already. We ignore this; eventually we should receive an
-		// update containing a complete topology.
-		log.Println("Topology gossip:", err)
-		return nil, nil, nil
-	}
-	if err != nil {
-		return nil, nil, err
-	}
-	if len(newUpdate) > 0 {
-		router.ConnectionMaker.Refresh()
-		router.Routes.Recalculate()
-	}
-	return origUpdate, newUpdate, nil
-}

router/sleeve.go

@@ -11,12 +11,15 @@ import (
 	"fmt"
 	"io"
 	"net"
+	"os"
 	"sync"
 	"syscall"
 	"time"
 
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
+
+	"github.com/weaveworks/weave/mesh"
 )
 
 // This diagram explains the various arithmetic and variables related
@@ -53,6 +56,10 @@ const (
 	FragTestInterval  = 5 * time.Minute
 	MTUVerifyAttempts = 8
 	MTUVerifyTimeout  = 10 * time.Millisecond // doubled with each attempt
+
+	ProtocolConnectionEstablished = mesh.ProtocolReserved1
+	ProtocolFragmentationReceived = mesh.ProtocolReserved2
+	ProtocolPMTUVerified          = mesh.ProtocolReserved3
 )
 
 type SleeveOverlay struct {
@@ -60,24 +67,22 @@ type SleeveOverlay struct {
 
 	// These fields are set in StartConsumingPackets, and not
 	// subsequently modified
-	localPeer    *Peer
+	localPeer    *mesh.Peer
 	localPeerBin []byte
 	consumer     OverlayConsumer
-	peers        *Peers
+	peers        *mesh.Peers
 	conn         *net.UDPConn
 
 	lock       sync.Mutex
-	forwarders map[PeerName]*sleeveForwarder
+	forwarders map[mesh.PeerName]*sleeveForwarder
 }
 
-func NewSleeveOverlay(localPort int) Overlay {
+func NewSleeveOverlay(localPort int) NetworkOverlay {
 	return &SleeveOverlay{localPort: localPort}
 }
 
-func (sleeve *SleeveOverlay) StartConsumingPackets(localPeer *Peer, peers *Peers,
-	consumer OverlayConsumer) error {
-	localAddr, err := net.ResolveUDPAddr("udp4",
-		fmt.Sprint(":", sleeve.localPort))
+func (sleeve *SleeveOverlay) StartConsumingPackets(localPeer *mesh.Peer, peers *mesh.Peers, consumer OverlayConsumer) error {
+	localAddr, err := net.ResolveUDPAddr("udp4", fmt.Sprint(":", sleeve.localPort))
 	if err != nil {
 		return err
 	}
@@ -97,8 +102,7 @@ func (sleeve *SleeveOverlay) StartConsumingPackets(localPeer *Peer, peers *Peers
 
 	// This makes sure all packets we send out do not have DF set
 	// on them.
-	err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP,
-		syscall.IP_MTU_DISCOVER, syscall.IP_PMTUDISC_DONT)
+	err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_MTU_DISCOVER, syscall.IP_PMTUDISC_DONT)
 	if err != nil {
 		return err
 	}
@@ -116,7 +120,7 @@ func (sleeve *SleeveOverlay) StartConsumingPackets(localPeer *Peer, peers *Peers
 	sleeve.consumer = consumer
 	sleeve.peers = peers
 	sleeve.conn = conn
-	sleeve.forwarders = make(map[PeerName]*sleeveForwarder)
+	sleeve.forwarders = make(map[mesh.PeerName]*sleeveForwarder)
 	go sleeve.readUDP()
 	return nil
 }
@@ -137,20 +141,19 @@ func (*SleeveOverlay) Diagnostics() interface{} {
 	return nil
 }
 
-func (sleeve *SleeveOverlay) lookupForwarder(peer PeerName) *sleeveForwarder {
+func (sleeve *SleeveOverlay) lookupForwarder(peer mesh.PeerName) *sleeveForwarder {
 	sleeve.lock.Lock()
 	defer sleeve.lock.Unlock()
 	return sleeve.forwarders[peer]
 }
 
-func (sleeve *SleeveOverlay) addForwarder(peer PeerName, fwd *sleeveForwarder) {
+func (sleeve *SleeveOverlay) addForwarder(peer mesh.PeerName, fwd *sleeveForwarder) {
 	sleeve.lock.Lock()
 	defer sleeve.lock.Unlock()
 	sleeve.forwarders[peer] = fwd
 }
 
-func (sleeve *SleeveOverlay) removeForwarder(peer PeerName,
-	fwd *sleeveForwarder) {
+func (sleeve *SleeveOverlay) removeForwarder(peer mesh.PeerName, fwd *sleeveForwarder) {
 	sleeve.lock.Lock()
 	defer sleeve.lock.Unlock()
 	if sleeve.forwarders[peer] == fwd {
@@ -175,7 +178,7 @@ func (sleeve *SleeveOverlay) readUDP() {
 			continue
 		}
 
-		fwdName := PeerNameFromBin(buf[:NameSize])
+		fwdName := mesh.PeerNameFromBin(buf[:NameSize])
 		fwd := sleeve.lookupForwarder(fwdName)
 		if fwd == nil {
 			continue
@@ -186,8 +189,7 @@ func (sleeve *SleeveOverlay) readUDP() {
 
 		err = fwd.crypto.Dec.IterateFrames(packet,
 			func(src []byte, dst []byte, frame []byte) {
-				sleeve.handleFrame(sender, fwd,
-					src, dst, frame, dec)
+				sleeve.handleFrame(sender, fwd, src, dst, frame, dec)
 			})
 		if err != nil {
 			// Errors during UDP packet decoding /
@@ -209,17 +211,15 @@ func (sleeve *SleeveOverlay) readUDP() {
 	}
 }
 
-func (sleeve *SleeveOverlay) handleFrame(sender *net.UDPAddr,
-	fwd *sleeveForwarder, src []byte, dst []byte, frame []byte,
-	dec *EthernetDecoder) {
+func (sleeve *SleeveOverlay) handleFrame(sender *net.UDPAddr, fwd *sleeveForwarder, src []byte, dst []byte, frame []byte, dec *EthernetDecoder) {
 	dec.DecodeLayers(frame)
 	decodedLen := len(dec.decoded)
 	if decodedLen == 0 {
 		return
 	}
 
-	srcPeer := sleeve.peers.Fetch(PeerNameFromBin(src))
-	dstPeer := sleeve.peers.Fetch(PeerNameFromBin(dst))
+	srcPeer := sleeve.peers.Fetch(mesh.PeerNameFromBin(src))
+	dstPeer := sleeve.peers.Fetch(mesh.PeerNameFromBin(dst))
 	if srcPeer == nil || dstPeer == nil {
 		return
 	}
@@ -246,8 +246,7 @@ func (sleeve *SleeveOverlay) handleFrame(sender *net.UDPAddr,
 	sleeve.sendToConsumer(srcPeer, dstPeer, frame, dec)
 }
 
-func (sleeve *SleeveOverlay) sendToConsumer(srcPeer, dstPeer *Peer,
-	frame []byte, dec *EthernetDecoder) {
+func (sleeve *SleeveOverlay) sendToConsumer(srcPeer, dstPeer *mesh.Peer, frame []byte, dec *EthernetDecoder) {
 	if sleeve.consumer == nil {
 		return
 	}
@@ -280,10 +279,16 @@ func (sleeve *SleeveOverlay) send(msg []byte, raddr *net.UDPAddr) error {
 	return err
 }
 
+type sleeveCrypto struct {
+	Dec   Decryptor
+	Enc   Encryptor
+	EncDF Encryptor
+}
+
 type sleeveForwarder struct {
 	// Immutable
 	sleeve         *SleeveOverlay
-	remotePeer     *Peer
+	remotePeer     *mesh.Peer
 	remotePeerBin  []byte
 	sendControlMsg func(byte, []byte) error
 	connUID        uint64
@@ -310,7 +315,7 @@ type sleeveForwarder struct {
 	stackFrag bool
 
 	// State only used within the forwarder goroutine
-	crypto     OverlayCrypto
+	crypto     sleeveCrypto
 	senderDF   *udpSenderDF
 	maxPayload int
 
@@ -350,13 +355,17 @@ type controlMessage struct {
 	msg []byte
 }
 
-func (sleeve *SleeveOverlay) MakeForwarder(params ForwarderParams) (OverlayForwarder, error) {
-	var crypto OverlayCrypto
-	if params.Crypto != nil {
-		crypto = *params.Crypto
+func (sleeve *SleeveOverlay) PrepareConnection(params mesh.OverlayConnectionParams) (mesh.OverlayConnection, error) {
+	name := sleeve.localPeer.NameByte
+	var crypto sleeveCrypto
+	if params.SessionKey != nil {
+		crypto = sleeveCrypto{
+			Dec:   NewNaClDecryptor(params.SessionKey, params.Outbound),
+			Enc:   NewNaClEncryptor(name, params.SessionKey, params.Outbound, false),
+			EncDF: NewNaClEncryptor(name, params.SessionKey, params.Outbound, true),
+		}
 	} else {
-		name := sleeve.localPeer.NameByte
-		crypto = OverlayCrypto{
+		crypto = sleeveCrypto{
 			Dec:   NewNonDecryptor(),
 			Enc:   NewNonEncryptor(name),
 			EncDF: NewNonEncryptor(name),
@@ -370,6 +379,11 @@ func (sleeve *SleeveOverlay) MakeForwarder(params ForwarderParams) (OverlayForwa
 	confirmedChan := make(chan struct{})
 	finishedChan := make(chan struct{})
 
+	var remoteAddr *net.UDPAddr
+	if params.Outbound {
+		remoteAddr = makeUDPAddr(params.RemoteAddr)
+	}
+
 	fwd := &sleeveForwarder{
 		sleeve:           sleeve,
 		remotePeer:       params.RemotePeer,
@@ -384,17 +398,16 @@ func (sleeve *SleeveOverlay) MakeForwarder(params ForwarderParams) (OverlayForwa
 		finishedChan:     finishedChan,
 		establishedChan:  make(chan struct{}),
 		errorChan:        make(chan error, 1),
-		remoteAddr:       params.RemoteAddr,
+		remoteAddr:       remoteAddr,
 		mtu:              DefaultMTU,
 		crypto:           crypto,
 		maxPayload:       DefaultMTU - UDPOverhead,
 		overheadDF: UDPOverhead + crypto.EncDF.PacketOverhead() +
 			crypto.EncDF.FrameOverhead() + EthernetOverhead,
-		senderDF: newUDPSenderDF(params.LocalIP, sleeve.localPort),
+		senderDF: newUDPSenderDF(params.LocalAddr.IP, sleeve.localPort),
 	}
 
-	go fwd.run(aggChan, aggDFChan, specialChan, controlMsgChan,
-		confirmedChan, finishedChan)
+	go fwd.run(aggChan, aggDFChan, specialChan, controlMsgChan, confirmedChan, finishedChan)
 	return fwd, nil
 }
 
@@ -436,8 +449,7 @@ func (fwd *sleeveForwarder) Forward(key ForwardPacketKey) FlowOp {
 	return curriedForward{fwd: fwd, key: key}
 }
 
-func (f curriedForward) Process(frame []byte, dec *EthernetDecoder,
-	broadcast bool) {
+func (f curriedForward) Process(frame []byte, dec *EthernetDecoder, broadcast bool) {
 	fwd := f.fwd
 	fwd.lock.RLock()
 	haveContact := (fwd.remoteAddr != nil)
@@ -446,8 +458,7 @@ func (f curriedForward) Process(frame []byte, dec *EthernetDecoder,
 	fwd.lock.RUnlock()
 
 	if !haveContact {
-		log.Print(fwd.logPrefix(),
-			"Cannot forward frame yet - awaiting contact")
+		log.Print(fwd.logPrefix(), "Cannot forward frame yet - awaiting contact")
 		return
 	}
 
@@ -466,8 +477,7 @@ func (f curriedForward) Process(frame []byte, dec *EthernetDecoder,
 	// of our pipeline.
 	if dec.DF() {
 		if !frameTooBig(frame, mtu) {
-			fwd.aggregate(fwd.aggregatorDFChan, srcName, dstName,
-				frame)
+			fwd.aggregate(fwd.aggregatorDFChan, srcName, dstName, frame)
 			return
 		}
 
@@ -492,8 +502,7 @@ func (f curriedForward) Process(frame []byte, dec *EthernetDecoder,
 
 		// The frag-needed packet does not have DF set, so the
 		// potential recursion here is bounded.
-		fwd.sleeve.sendToConsumer(f.key.DstPeer, f.key.SrcPeer,
-			fragNeededPacket, dec)
+		fwd.sleeve.sendToConsumer(f.key.DstPeer, f.key.SrcPeer, fragNeededPacket, dec)
 		return
 	}
 
@@ -514,21 +523,18 @@ func (f curriedForward) Process(frame []byte, dec *EthernetDecoder,
 	// fragment it ourself.
 	checkWarn(fragment(dec.Eth, dec.IP, mtu,
 		func(segFrame []byte) {
-			fwd.aggregate(fwd.aggregatorDFChan, srcName, dstName,
-				segFrame)
+			fwd.aggregate(fwd.aggregatorDFChan, srcName, dstName, segFrame)
 		}))
 }
 
-func (fwd *sleeveForwarder) aggregate(ch chan<- aggregatorFrame, src []byte,
-	dst []byte, frame []byte) {
+func (fwd *sleeveForwarder) aggregate(ch chan<- aggregatorFrame, src []byte, dst []byte, frame []byte) {
 	select {
 	case ch <- aggregatorFrame{src, dst, frame}:
 	case <-fwd.finishedChan:
 	}
 }
 
-func fragment(eth layers.Ethernet, ip layers.IPv4, mtu int,
-	forward func([]byte)) error {
+func fragment(eth layers.Ethernet, ip layers.IPv4, mtu int, forward func([]byte)) error {
 	// We are not doing any sort of NAT, so we don't need to worry
 	// about checksums of IP payload (eg UDP checksum).
 	headerSize := int(ip.IHL) * 4
@@ -570,8 +576,7 @@ func fragment(eth layers.Ethernet, ip layers.IPv4, mtu int,
 		ip.FragOffset = uint16((offset + offsetBase) >> 3)
 		buf := gopacket.NewSerializeBuffer()
 		segPayload := gopacket.Payload(segmentPayload)
-		err := gopacket.SerializeLayers(buf, opts, &eth, &ip,
-			&segPayload)
+		err := gopacket.SerializeLayers(buf, opts, &eth, &ip, &segPayload)
 		if err != nil {
 			return err
 		}
@@ -623,13 +628,10 @@ loop:
 	for err == nil {
 		select {
 		case frame := <-aggChan:
-			err = fwd.aggregateAndSend(frame, aggChan,
-				fwd.crypto.Enc, fwd.sleeve,
-				MaxUDPPacketSize-UDPOverhead)
+			err = fwd.aggregateAndSend(frame, aggChan, fwd.crypto.Enc, fwd.sleeve, MaxUDPPacketSize-UDPOverhead)
 
 		case frame := <-aggDFChan:
-			err = fwd.aggregateAndSend(frame, aggDFChan,
-				fwd.crypto.EncDF, fwd.senderDF, fwd.maxPayload)
+			err = fwd.aggregateAndSend(frame, aggDFChan, fwd.crypto.EncDF, fwd.senderDF, fwd.maxPayload)
 
 		case sf := <-specialChan:
 			err = fwd.handleSpecialFrame(sf)
@@ -683,8 +685,7 @@ loop:
 }
 
 func (fwd *sleeveForwarder) aggregateAndSend(frame aggregatorFrame,
-	aggChan <-chan aggregatorFrame, enc Encryptor, sender udpSender,
-	limit int) error {
+	aggChan <-chan aggregatorFrame, enc Encryptor, sender udpSender, limit int) error {
 	// Give up after processing N frames, to avoid starving the
 	// other activities of the forwarder goroutine.
 	i := 0
@@ -734,8 +735,7 @@ func fits(frame aggregatorFrame, enc Encryptor, limit int) bool {
 	return enc.TotalLen()+enc.FrameOverhead()+len(frame.frame) <= limit
 }
 
-func (fwd *sleeveForwarder) flushEncryptor(enc Encryptor,
-	sender udpSender) error {
+func (fwd *sleeveForwarder) flushEncryptor(enc Encryptor, sender udpSender) error {
 	msg, err := enc.Bytes()
 	if err != nil {
 		return err
@@ -744,8 +744,7 @@ func (fwd *sleeveForwarder) flushEncryptor(enc Encryptor,
 	return fwd.processSendError(sender.send(msg, fwd.remoteAddr))
 }
 
-func (fwd *sleeveForwarder) sendSpecial(enc Encryptor, sender udpSender,
-	data []byte) error {
+func (fwd *sleeveForwarder) sendSpecial(enc Encryptor, sender udpSender, data []byte) error {
 	enc.AppendFrame(fwd.sleeve.localPeerBin, fwd.remotePeerBin, data)
 	return fwd.flushEncryptor(enc, sender)
 }
@@ -776,8 +775,7 @@ func (fwd *sleeveForwarder) handleControlMessage(cm controlMessage) error {
 		return fwd.handleMTUTestAck(cm.msg)
 
 	default:
-		log.Print(fwd.logPrefix(),
-			"Ignoring unknown control message tag: ", cm.tag)
+		log.Print(fwd.logPrefix(), "Ignoring unknown control message tag: ", cm.tag)
 		return nil
 	}
 }
@@ -836,8 +834,7 @@ func (fwd *sleeveForwarder) handleHeartbeat(special specialFrame) error {
 			}
 		}
 	} else if !udpAddrsEqual(fwd.remoteAddr, special.sender) {
-		log.Print(fwd.logPrefix(),
-			"Peer UDP address changed to ", special.sender)
+		log.Print(fwd.logPrefix(), "Peer UDP address changed to ", special.sender)
 		fwd.setRemoteAddr(special.sender)
 	}
 
@@ -1146,3 +1143,29 @@ func timerChan(timer *time.Timer) <-chan time.Time {
 	}
 	return nil
 }
+
+func tickerChan(ticker *time.Ticker) <-chan time.Time {
+	if ticker != nil {
+		return ticker.C
+	}
+	return nil
+}
+
+func makeUDPAddr(addr *net.TCPAddr) *net.UDPAddr {
+	return &net.UDPAddr{IP: addr.IP, Port: addr.Port, Zone: addr.Zone}
+}
+
+// Look inside an error produced by the net package to get to the
+// syscall.Errno at the root of the problem.
+func PosixError(err error) error {
+	if operr, ok := err.(*net.OpError); ok {
+		err = operr.Err
+	}
+
+	// go1.5 wraps an Errno inside a SyscallError inside an OpError
+	if scerr, ok := err.(*os.SyscallError); ok {
+		err = scerr.Err
+	}
+
+	return err
+}

router/utils.go

@@ -1,117 +0,0 @@
-package router
-
-import (
-	"bytes"
-	"crypto/rand"
-	"encoding/binary"
-	"encoding/gob"
-	"fmt"
-	"net"
-	"os"
-
-	"github.com/weaveworks/weave/common"
-)
-
-var log = common.Log
-
-var void = struct{}{}
-
-func checkFatal(e error) {
-	if e != nil {
-		log.Fatal(e)
-	}
-}
-
-func checkWarn(e error) {
-	if e != nil {
-		log.Warnln(e)
-	}
-}
-
-// Look inside an error produced by the net package to get to the
-// syscall.Errno at the root of the problem.
-func PosixError(err error) error {
-	if operr, ok := err.(*net.OpError); ok {
-		err = operr.Err
-	}
-
-	// go1.5 wraps an Errno inside a SyscallError inside an OpError
-	if scerr, ok := err.(*os.SyscallError); ok {
-		err = scerr.Err
-	}
-
-	return err
-}
-
-func (upe UnknownPeerError) Error() string {
-	return fmt.Sprint("Reference to unknown peer ", upe.Name)
-}
-
-func (nce NameCollisionError) Error() string {
-	return fmt.Sprint("Multiple peers found with same name: ", nce.Name)
-}
-
-func (pde PacketDecodingError) Error() string {
-	return fmt.Sprint("Failed to decode packet: ", pde.Desc)
-}
-
-func Concat(elems ...[]byte) []byte {
-	res := []byte{}
-	for _, e := range elems {
-		res = append(res, e...)
-	}
-	return res
-}
-
-func randBytes(n int) []byte {
-	buf := make([]byte, n)
-	_, err := rand.Read(buf)
-	checkFatal(err)
-	return buf
-}
-
-func randUint64() (r uint64) {
-	return binary.LittleEndian.Uint64(randBytes(8))
-}
-
-func randUint16() (r uint16) {
-	return binary.LittleEndian.Uint16(randBytes(2))
-}
-
-func GobEncode(items ...interface{}) []byte {
-	buf := new(bytes.Buffer)
-	enc := gob.NewEncoder(buf)
-	for _, i := range items {
-		checkFatal(enc.Encode(i))
-	}
-	return buf.Bytes()
-}
-
-func macint(mac net.HardwareAddr) (r uint64) {
-	for _, b := range mac {
-		r <<= 8
-		r |= uint64(b)
-	}
-	return
-}
-
-func intmac(key uint64) (r net.HardwareAddr) {
-	r = make([]byte, 6)
-	for i := 5; i >= 0; i-- {
-		r[i] = byte(key)
-		key >>= 8
-	}
-	return
-}
-
-type ListOfPeers []*Peer
-
-func (lop ListOfPeers) Len() int {
-	return len(lop)
-}
-func (lop ListOfPeers) Swap(i, j int) {
-	lop[i], lop[j] = lop[j], lop[i]
-}
-func (lop ListOfPeers) Less(i, j int) bool {
-	return lop[i].Name < lop[j].Name
-}

site/_includes/footer.html

@@ -69,3 +69,17 @@
       s.parentNode.insertBefore(wf, s);
     })();
 </script>
+<script type="text/javascript">
+piAId = '124932';
+piCId = '85570';
+
+(function() {
+function async_load(){
+var s = document.createElement('script'); s.type = 'text/javascript';
+s.src = ('https:' == document.location.protocol ? 'https://pi' : 'http://cdn') + '.pardot.com/pd.js';
+var c = document.getElementsByTagName('script')[0]; c.parentNode.insertBefore(s, c);
+}
+if(window.attachEvent) { window.attachEvent('onload', async_load); }
+else { window.addEventListener('load', async_load, false); }
+})();
+</script>

site/building.md

@@ -11,7 +11,7 @@ You only need to build weave if you want to work on the weave codebase
 Apart from the `weave` shell script, weave is delivered as a set of
 container images.  There is no distribution-specific packaging, so in
 principle it shouldn't matter which Linux distribution you build
-under.  But naturally, Docker is a prerequisite (version 1.3.1 or
+under.  But naturally, Docker is a prerequisite (version 1.6.0 or
 later).  And it is difficult to build under Fedora because [Fedora
 does not include static
 libraries](http://fedoraproject.org/wiki/Packaging:Guidelines#Packaging_Static_Libraries).
@@ -21,7 +21,11 @@ You can also build in a container under any system that supports
 Docker.  And you can run Ubuntu in a VM and build there.  These
 options are described below.
 
-## Building directly on Ubuntu
+ * [Building directly on Ubuntu](#ubuntu)
+ * [Building in a Docker container](#docker)
+ * [Building using Vagrant](#vagrant)
+
+## <a name="ubuntu"></a>Building directly on Ubuntu
 
 The weave git repository should be cloned into
 `$GOPATH/src/github.com/weaveworks/weave`, in accordance with [the go
@@ -53,10 +57,10 @@ $ make
 ```
 
 This will build the weave components and package them into three
-Docker images (`weaveworks/weave`, `weaveworks/weavedns`, and
-`weaveworks/weaveexec`).  These are then exported as `weave.tar`.
+Docker images (`weaveworks/weave`, `weaveworks/weaveexec`, and
+`weaveworks/plugin`).  These are then exported as `weave.tar.gz`.
 
-## Building in a Docker container
+## <a name="docker"></a>Building in a Docker container
 
 As a preliminary step, we create a container image based on Ubuntu
 that has all the prerequisites.  This avoids the need to download and
@@ -106,7 +110,7 @@ $ sudo docker run -v /var/run/docker.sock:/var/run/docker.sock -v <host gopath>:
 This will leave the intermediate build artifacts on the host, so that
 you can modify the weave source code and rebuild quickly.
 
-## Building using Vagrant
+## <a name="vagrant"></a>Building using Vagrant
 
 If you aren't running Linux, or otherwise don't want to run the docker
 daemon outside a VM, you can use
@@ -167,13 +171,13 @@ you can do so with
 $ vagrant ssh -c 'make -C src/github.com/weaveworks/weave'
 ```
 
-you should then find a `weave.tar` container snapshot tarball in the
+you should then find a `weave.tar.gz` container snapshot tarball in the
 top-level directory. You can use that snapshot with `docker load`
 against a different host, e.g.
 
 ```bash
 $ export DOCKER_HOST=tcp://<HOST:PORT>
-$ docker load < weave.tar
+$ docker load < weave.tar.gz
 ```
 
 You can provide extra Vagrant configuration by putting a file

site/features.md

@@ -11,6 +11,7 @@ example](https://github.com/weaveworks/weave#example):
  * [Virtual ethernet switch](#virtual-ethernet-switch)
  * [Fast data path](#fast-data-path)
  * [Seamless Docker integration](#docker)
+ * [Docker network plugin](#plugin)
  * [Address allocation](#addressing)
  * [Naming and discovery](#naming-and-discovery)
  * [Application isolation](#application-isolation)
@@ -49,6 +50,8 @@ TCP/IP, e.g. a netcat UDP service would be run with
 
     root@a2:/# echo 'Hello, world.' | nc -u a1 5533
 
+Broadcast and multicast protocols also work over Weave Net.
+
 We can deploy the entire arsenal of standard network tools and
 applications, developed over decades, to configure, secure, monitor,
 and troubleshoot our container network. To put it another way, we can
@@ -62,7 +65,9 @@ Weave automatically chooses the fastest available method to transport
 data between peers. The most performant of these ('fastdp') offers
 near-native throughput and latency but does not support encryption;
 consequently supplying a password will cause the router to fall back
-to a slower mode ('sleeve') that does.
+to a slower mode ('sleeve') that does, for connections that traverse
+untrusted networks (see the [security](#security) section for more
+details).
 
 Even when encryption is not in use, certain adverse network conditions
 will cause this fallback to occur dynamically; in these circumstances,
@@ -88,6 +93,15 @@ Containers started in this way that subsequently restart, either by an
 explicit `docker restart` command or by Docker restart policy, are
 re-attached to the weave network by the weave Docker API proxy.
 
+### <a name="plugin"></a>Docker network plugin
+
+Alternatively, you can use weave as a Docker plugin.  A Docker network
+named `weave` is created by `weave launch`, which you can use like this:
+
+    $ docker run --net=weave -ti ubuntu
+
+For more details see the [plugin documentation](plugin.html).
+
 ### <a name="addressing"></a>Address allocation
 
 Containers are automatically allocated an IP address that is unique
@@ -101,7 +115,8 @@ Weave detects when a container has exited and releases its
 automatically allocated addresses so they can be re-used.
 
 See the [Automatic IP Address Management](ipam.html) documentation for
-further details.
+further details. We also have an explanation of
+[the basics of IP addressing](ip-addresses.html)
 
 Instead of getting weave to allocate IP addresses automatically, it is
 also possible to specify an address and network explicitly, expressed
@@ -219,7 +234,7 @@ NB: By default docker permits communication between containers on the
 same host, via their docker-assigned IP addresses. For complete
 isolation between application containers, that feature needs to be
 disabled by
-[setting `--icc=false`](https://docs.docker.com/articles/networking/#between-containers)
+[setting `--icc=false`](https://docs.docker.com/engine/userguide/networking/default_network/container-communication/#communication-between-containers)
 in the docker daemon configuration. Furthermore, containers should be
 prevented from capturing and injecting raw network packets - this can
 be accomplished by starting them with the `--cap-drop net_raw` option.
@@ -302,10 +317,24 @@ way to generate a random password which satsifies this requirement is
 
     < /dev/urandom tr -dc A-Za-z0-9 | head -c9 ; echo
 
-The same password must be specified for all weave peers. Note that
-supplying a password will [cause weave to fall back to a slower
-method](#fast-data-path) for transporting data between
-peers.
+The same password must be specified for all weave peers; by default
+both control and data plane traffic will then use authenticated
+encryption. If some of your peers are colocated in a trusted network
+(for example within the boundary of your own datacentre) you can use
+the `--trusted-subnets` argument to `weave launch` to selectively
+disable data plane encryption as an optimisation. Both peers must
+consider the other to be in a trusted subnet for this to take place -
+if they do not, weave will [fall back to a slower
+method](#fast-data-path) for transporting data between peers as fast
+datapath does not support encryption.
+
+Be aware that:
+
+* Containers will be able to access the router REST API if you have
+  disabled fast datapath. You can prevent this by setting
+  [`--icc=false`](https://docs.docker.com/engine/userguide/networking/default_network/container-communication/#communication-between-containers)
+* Containers are able to access the router control and data plane
+  ports, but you can mitigate this by enabling encryption
 
 ### <a name="host-network-integration"></a>Host network integration
 

site/ip-addresses.md

@@ -0,0 +1,103 @@
+---
+title: IP Addresses, routes and networks
+layout: default
+---
+
+# IP Addresses, routes and networks
+
+Weave Net lets you run containers on a private network, and so the IP
+addresses those containers use are insulated from the rest of the
+Internet, and you don't have to worry about them clashing. Except, if
+they actually do clash with some addresses that you'd like the
+containers to talk to.
+
+### Some definitions
+
+- _IP_ is the Internet Protocol, the fundamental basis of network
+   communication between billions of connected devices.
+- The _IP address_ is (for most purposes) the four numbers separated
+  by dots, like `192.168.48.12`. Each number is one byte in size, so can
+  be between 0 and 255.
+- Each IP address lives on a _Network_, which is some set of those
+  addresses that all know how talk to each other. The network address
+  is some prefix of the IP address, like `192.168.48`. To show
+  which part of the address is the network, we append a slash
+  and then the number of bits in the network prefix, like
+  `/24`.
+- A _route_ is an instruction for how to deal with traffic destined
+  for somewhere else - it specifies a Network, and a way to talk to
+  that network.  Every device using IP has a table of routes, so for
+  any destination address it looks up that table, finds the right
+  route, and sends it in the direction indicated.
+
+### Examples
+
+In the IP address `10.4.2.6/8`, the network prefix is the first 8 bits
+- `10`. Written out in full, that network is `10.0.0.0/8`.
+
+The most common prefix lengths are 8, 16 and 24, but there is nothing
+stopping you using a /9 network or a /26. E.g. `6.250.3.1/9` is on the
+`6.128.0.0/9` network.
+
+Several websites offer calculators to decode this kind of address; for
+example [IP Address Guide](http://www.ipaddressguide.com/cidr).
+
+Here is an example route table for a container attached to the Weave
+network:
+
+````
+# ip route show
+default via 172.17.42.1 dev eth0 
+10.2.2.0/24 dev ethwe  proto kernel  scope link  src 10.2.2.1 
+172.17.0.0/16 dev eth0  proto kernel  scope link  src 172.17.0.170 
+````
+
+It has two interfaces: one that Docker gave it called `eth0`, and one
+that weave gave it called `ethwe`. They are on networks
+`172.17.0.0/16` and `10.2.2.0/24` respectively, and if you want to
+talk to any other address on those networks then the routing table
+tells it to send directly down that interface. If you want to talk to
+anything else not matching those rules, the default rule says to send
+it to `172.17.42.1` down the eth0 interface.
+
+So, suppose this container wants to talk to another container at
+address `10.2.2.9`; it will send down the ethwe interface and weave
+Net will take care of routing the traffic. To talk an external server
+at address `74.125.133.128`, it looks in its routing table, doesn't
+find a match, so uses the default rule.
+
+### Configuring Weave
+
+The default configurations for both weave Net and Docker use [Private
+Networks](https://en.wikipedia.org/wiki/Private_network), whose
+addresses are never found on the public internet, so that reduces the
+chances of overlap. But it could be that you or your hosting provider
+are using some of these private addresses in the same range, which would
+cause a clash.
+
+Here's an example: on `weave launch`, the following error message
+can appear:
+
+````
+Network 10.32.0.0/12 overlaps with existing route 10.0.0.0/8 on host.
+ERROR: Default --ipalloc-range 10.32.0.0/12 overlaps with existing route on host.
+You must pick another range and set it on all hosts.
+````
+
+As the message says, the default that weave Net would like to use is
+`10.32.0.0/12` - a 12-bit prefix so all addresses starting with the bit
+pattern 000010100010, or in decimal everything from 10.32.0.0 through
+10.47.255.255. But the user's host already has a route for `10.0.0.0/8`,
+which overlaps, because the first 8 bits are the same. If we went
+ahead and used the default network, then for an address like
+`10.32.5.6` the kernel would never be sure whether this meant the
+weave Net network of `10.32.0.0/12` or the hosting network of
+`10.0.0.0/8`.
+
+If you're sure the addresses you want are not really in use, then
+explicitly setting the range with `--ipalloc-range` in the
+command-line arguments to `weave launch` on all hosts will force Weave
+Net to use that range, even though it overlaps. Otherwise, you can
+pick a different range, preferrably another subset of the [Private
+Networks](https://en.wikipedia.org/wiki/Private_network).  For example
+172.30.0.0/16.

site/ipam.md

@@ -105,21 +105,12 @@ range. This can be overridden with the `--ipalloc-range` option, e.g.
 
 and must be the same on every host.
 
-> The specified range is for *exclusive* use by the IP allocator. In
-> particular, when starting containers with manually assigned IP
-> addresses, these must be outside the IP allocator's range.  If, in
-> our example, you subsequently executed `docker run -e
-> WEAVE_CIDR=10.2.3.1/24 -ti ubuntu`, the IP allocator might assign
-> the same address to another container, which will break IP routing
-> for the containers sharing an address.
-
 The range parameter is written in
 [CIDR notation](http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing) -
 in this example "/16" means the first 16 bits of the address form the
 network address and the allocator is to allocate container addresses
-that all start 10.2. The ".0" and ".-1" addresses in a subnet are not
-used, as required by
-[RFC 1122](https://tools.ietf.org/html/rfc1122#page-29).
+that all start 10.2. We have [a page with more information on IP
+addresses and routes](ip-addresses.html).
 
 Weave shares the IP address range across all peers, dynamically
 according to their needs.  If a group of peers becomes isolated from
@@ -129,11 +120,16 @@ to the rest of the network without any conflicts arising.
 
 ## <a name="subnets"></a>Automatic allocation across multiple subnets
 
-When
-[running containers on different subnets](features.html#application-isolation),
-you may wish to request the allocation of an address from a particular
-subnet. This is done by specifying the subnet with `net:<subnet>`, in
-CIDR notation, e.g.
+IP subnets are used to define or restrict routing. By default, weave
+puts all containers in a subnet that spans the entire allocation
+range, so every weave-attached container can talk to every other
+weave-attached container.
+
+If you want some [isolation](features.html#application-isolation), you
+can choose to run containers on different subnets.  To request the
+allocation of an address from a particular subnet, set the
+`WEAVE_CIDR` environment variable to `net:<subnet>` when creating the
+container, e.g.
 
     host1$ docker run -e WEAVE_CIDR=net:10.2.7.0/24 -ti ubuntu
 
@@ -143,6 +139,9 @@ for instance:
 
     host1$ docker run -e WEAVE_CIDR="net:10.2.7.0/24 net:10.2.8.0/24 ip:10.3.9.1/24" -ti ubuntu
 
+(Note the ".0" and ".-1" addresses in a subnet are not used, as required by
+[RFC 1122](https://tools.ietf.org/html/rfc1122#page-29)).
+
 When working with multiple subnets in this way, it is usually
 desirable to constrain the default subnet - i.e. the one chosen by the
 allocator when no subnet is supplied - so that it does not overlap
@@ -216,7 +215,7 @@ reports on the current status of the weave router and IP allocator:
 
        Service: ipam
      Consensus: waiting(quorum: 2, known: 0)
-         Range: [10.32.0.0-10.48.0.0)
+         Range: 10.32.0.0-10.47.255.255
  DefaultSubnet: 10.32.0.0/12
 
 ...