From adafb79e34c398ba20896ae9314defb86ca13735 Mon Sep 17 00:00:00 2001
From: Bryan Boreham <bjboreham@gmail.com>
Date: Mon, 21 Dec 2015 13:41:54 +0000
Subject: [PATCH] Move endpoint creation into CreateEndpoint so we can return
 the MAC address

---
 plugin/net/driver.go | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/plugin/net/driver.go b/plugin/net/driver.go
index 12b4a62f..c4b9c61e 100644
--- a/plugin/net/driver.go
+++ b/plugin/net/driver.go
@@ -73,18 +73,27 @@ func (driver *driver) DeleteNetwork(delete *api.DeleteNetworkRequest) error {
 }
 
 func (driver *driver) CreateEndpoint(create *api.CreateEndpointRequest) (*api.CreateEndpointResponse, error) {
-	Log.Debugf("Create endpoint request %+v", create)
+	Log.Debugf("Create endpoint request %+v interface %+v", create, create.Interface)
 	endID := create.EndpointID
 
 	if create.Interface == nil {
 		return nil, fmt.Errorf("Not supported: creating an interface from within CreateEndpoint")
 	}
+	// create veths. note we assume endpoint IDs are unique in the first 5 chars
+	local := vethPair(endID[:5])
+	if err := netlink.LinkAdd(local); err != nil {
+		return nil, errorf("could not create veth pair: %s", err)
+	}
 	driver.Lock()
 	driver.endpoints[endID] = struct{}{}
 	driver.Unlock()
-	resp := &api.CreateEndpointResponse{}
+
+	// Send back the MAC address
+	link, _ := netlink.LinkByName(local.PeerName)
+	resp := &api.CreateEndpointResponse{Interface: &api.EndpointInterface{MacAddress: link.Attrs().HardwareAddr.String()}}
 
 	Log.Infof("Create endpoint %s %+v", endID, resp)
+	Log.Infof("Veth info %+v", local)
 	return resp, nil
 }
 
@@ -94,6 +103,10 @@ func (driver *driver) DeleteEndpoint(deleteReq *api.DeleteEndpointRequest) error
 	driver.Lock()
 	delete(driver.endpoints, deleteReq.EndpointID)
 	driver.Unlock()
+	local := vethPair(deleteReq.EndpointID[:5])
+	if err := netlink.LinkDel(local); err != nil {
+		Log.Warningf("unable to delete veth: %s", err)
+	}
 	return nil
 }
 
@@ -118,11 +131,9 @@ func (driver *driver) JoinEndpoint(j *api.JoinRequest) (*api.JoinResponse, error
 		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)
+	if err = netlink.LinkSetMTU(local, maybeBridge.Attrs().MTU); err != nil {
+		return nil, errorf(`unable to set mtu: %s`, err)
 	}
 
 	switch maybeBridge.(type) {
@@ -177,11 +188,6 @@ func (driver *driver) JoinEndpoint(j *api.JoinRequest) (*api.JoinResponse, error
 
 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
 }