Commit 8a3c3a97 authored Feb 04, 2007 by Baruch Even Committed by David S. Miller Feb 08, 2007

[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>

parent 6f74651a

net/ipv4/tcp_input.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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)

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