Matthias Radestock 27c9e70ea9 better handling of unidirectional udp connectivity ...

Currently we cannot distinguish bi-directional and uni-directional
connectivity between peers. This is what currently happens for a
connection from A to B...

A: remoteUDPAddr=X
B: remoteUDPAddr=nil
A: send fast heartbeats over UDP
B: receive heartbeat; remoteUDPAddr is nil
   remoteUDPAddr=Y
   send 'established' over TCP
   established=true
   send slow heartbeats over UDP
A: receive 'established' over TCP
   established=true
   send slow heartbeats over UDP

If udp packets make it through from A to B but not B to A then both
ends mark the connection as 'established'. Conversely, if udp packets
make it through from B to A but not A to B then the connection is not
marked as 'established' at either end.

In the new scheme, this is what happens...

A: receivedHeartbeat=false, remoteUDPAddr=X
B: receivedHeartbeat=false, remoteUDPAddr=nil
A: send fast heartbeats over UDP
B: receive heartbeat; receivedHeartbeat is false
   remoteUDPAddr=Y
   receivedHeartbeat=true
   send 'established' over TCP
   send fast heartbeats over UDP
A: receive 'established' over TCP (*)
   established=true
   send slow heartbeats over UDP
A: receive heartbeat; receivedHeartbeat is false (*)
   receivedHeartbeat=true
   send 'established' over TCP
B: receive 'established' over TCP
   established=true
   send slow heartbeats over UDP

(*) either of these may occur first

Now, if udp packets make it through from A to B not not B to A then A
marks the connection as 'established' but B doesn't. Conversely, if
udp packets make it through from B to A but not A to B then B marks
the connection as 'established' but A doesn't.

2015-01-15 14:16:16 +00:00

..

connection_maker.go

oops

2015-01-13 16:38:58 +00:00

connection.go

better handling of unidirectional udp connectivity

2015-01-15 14:16:16 +00:00

consts.go

better handling of unidirectional udp connectivity

2015-01-15 14:16:16 +00:00

crypto.go

close connection when failing to decrypt packets

2014-12-28 19:52:56 +00:00

ethernet_decoder.go

remove explicit multicast detection

2014-10-24 14:30:58 +01:00

forwarder.go

refactor: move udp sender code into separate file

2015-01-14 17:51:01 +00:00

local_peer.go

improve connection logging

2015-01-13 15:47:23 +00:00

mac_cache.go

fix package name following move

2014-10-15 15:20:49 +01:00

pcap.go

fix package name following move

2014-10-15 15:20:49 +01:00

peer_name_hash.go

fix package name following move

2014-10-15 15:20:49 +01:00

peer_name_mac.go

fix package name following move

2014-10-15 15:20:49 +01:00

peer.go

refactor: move LocalPeer code into separate file

2014-12-25 14:05:41 +00:00

peers.go

refactor: give Peers knowledge of Ourself.Peer and MacCache

2014-12-25 13:49:58 +00:00

router.go

better handling of unidirectional udp connectivity

2015-01-15 14:16:16 +00:00

routes.go

refactor: narrow dependencies of Routes

2014-12-24 19:40:18 +00:00

types.go

better handling of unidirectional udp connectivity

2015-01-15 14:16:16 +00:00

udp_sender.go

refactor: move udp sender code into separate file

2015-01-14 17:51:01 +00:00

utils.go

oops

2014-12-01 12:56:02 +00:00