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authorBaruch Even <baruch@ev-en.org>2007-02-04 23:37:41 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2007-02-08 12:38:50 -0800
commit8a3c3a972741dec77220a19642bd3331551ad2d9 (patch)
tree067787f9faef7ada3d0096742f79a930ec808357
parent6f74651ae626ec672028587bc700538076dfbefb (diff)
[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>
-rw-r--r--net/ipv4/tcp_input.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 870f53afd36..c6109895bb5 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -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)