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[TCP]: Check num sacks in SACK fast path 

We clear the unused parts of the SACK cache, This prevents us from mistakenly
taking the cache data if the old data in the SACK cache is the same as the data
in the SACK block. This assumes that we never receive an empty SACK block with
start and end both at zero.

Signed-off-by: Baruch Even <baruch@ev-en.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Baruch Even 2007-02-04 23:37:41 -08:00 committed by David S. Miller
parent 6f74651ae6
commit 8a3c3a9727
1 changed files with 5 additions and 0 deletions
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5
net/ipv4/tcp_input.c
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@ -998,6 +998,11 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
tp->recv_sack_cache[i].start_seq = start_seq;
tp->recv_sack_cache[i].end_seq = end_seq;
}
/* Clear the rest of the cache sack blocks so they won't match mistakenly. */
for (; i < ARRAY_SIZE(tp->recv_sack_cache); i++) {
tp->recv_sack_cache[i].start_seq = 0;
tp->recv_sack_cache[i].end_seq = 0;
}
first_sack_index = 0;
if (flag)