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authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>2007-05-19 13:56:57 -0700
committerDavid S. Miller <davem@davemloft.net>2007-05-19 13:56:57 -0700
commit580e572a4a1bfea2f42af63ba4785ac7dfbcb45d (patch)
tree0c28904f333818cfe86a6cf95cee8bff75eec0a7
parent463236557db4b5d4de9eb3fafa2e7d7905ac65ab (diff)
[TCP] FRTO: Prevent state inconsistency in corner cases
State could become inconsistent in two cases: 1) Userspace disabled FRTO by tuning sysctl when one of the TCP flows was in the middle of FRTO algorithm (and then RTO is again triggered) 2) SACK reneging occurs during FRTO algorithm A simple solution is just to abort the previous FRTO when such obscure condition occurs... Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/tcp_input.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 7ecdc89229e..38cb25b48bf 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1501,6 +1501,8 @@ void tcp_enter_loss(struct sock *sk, int how)
tcp_set_ca_state(sk, TCP_CA_Loss);
tp->high_seq = tp->snd_nxt;
TCP_ECN_queue_cwr(tp);
+ /* Abort FRTO algorithm if one is in progress */
+ tp->frto_counter = 0;
clear_all_retrans_hints(tp);
}