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[TCP] FRTO: Prevent state inconsistency in corner cases

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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>
This commit is contained in:
Ilpo Järvinen 2007-05-19 13:56:57 -07:00 committed by David S. Miller
parent 463236557d
commit 580e572a4a
1 changed files with 2 additions and 0 deletions
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2
net/ipv4/tcp_input.c
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@ -1501,6 +1501,8 @@ void tcp_enter_loss(struct sock *sk, int how)
tcp_set_ca_state(sk, TCP_CA_Loss); tcp_set_ca_state(sk, TCP_CA_Loss);
tp->high_seq = tp->snd_nxt; tp->high_seq = tp->snd_nxt;
TCP_ECN_queue_cwr(tp); TCP_ECN_queue_cwr(tp);
/* Abort FRTO algorithm if one is in progress */
tp->frto_counter = 0;
clear_all_retrans_hints(tp); clear_all_retrans_hints(tp);
} }