net: sctp: confirm route during forward progress
authorDaniel Borkmann <dborkman@redhat.com>
Tue, 9 Jul 2013 14:17:04 +0000 (16:17 +0200)
committerDavid S. Miller <davem@davemloft.net>
Tue, 9 Jul 2013 19:49:56 +0000 (12:49 -0700)
commit8c2f414ad1b3aa3af05791cd7312eb8ff9d80e0d
tree5d4281f3fbb68256211eaa2d39e45dc85c0874d8
parente1d6fbc3dedbb463fc79b48ddb05ab6b20fd088a
net: sctp: confirm route during forward progress

This fix has been proposed originally by Vlad Yasevich. He says:

  When SCTP makes forward progress (receives a SACK that acks new chunks,
  renegs, or answeres 0-window probes) or when HB-ACK arrives, mark
  the route as confirmed so we don't unnecessarily send NUD probes.

Having a simple SCTP client/server that exchange data chunks every 1sec,
without this patch ARP requests are sent periodically every 40-60sec.
With this fix applied, an ARP request is only done once right at the
"session" beginning. Also, when clearing the related ARP cache entry
manually during the session, a new request is correctly done. I have
only "backported" this to net-next and tested that it works, so full
credit goes to Vlad.

Signed-off-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/sctp/outqueue.c
net/sctp/sm_sideeffect.c