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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 /net
parent[TCP]: Seperate DSACK from SACK fast path (diff)
downloadlinux-dev-8a3c3a972741dec77220a19642bd3331551ad2d9.tar.xz
linux-dev-8a3c3a972741dec77220a19642bd3331551ad2d9.zip
[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>
Diffstat (limited to '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 870f53afd363..c6109895bb5e 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)