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| author | Jarek Poplawski <jarkao2@o2.pl> | 2007-01-23 22:07:12 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2007-01-23 22:07:12 -0800 |
| commit | 52d570aabe921663a987b2e4bae2bdc411cee480 (patch) | |
| tree | 2d4aff7efc6be2795894864b5b2043a514c11b55 | |
| parent | bf1c1ee88008fd639ebb5c74f0555fd414369bdc (diff) | |
| download | linux-52d570aabe921663a987b2e4bae2bdc411cee480.tar.gz linux-52d570aabe921663a987b2e4bae2bdc411cee480.tar.bz2 linux-52d570aabe921663a987b2e4bae2bdc411cee480.zip | |
[TCP]: rare bad TCP checksum with 2.6.19
The patch "Replace CHECKSUM_HW by CHECKSUM_PARTIAL/CHECKSUM_COMPLETE"
changed to unconditional copying of ip_summed field from collapsed
skb. This patch reverts this change.
The majority of substantial work including heavy testing
and diagnosing by: Michael Tokarev <mjt@tls.msk.ru>
Possible reasons pointed by: Herbert Xu and Patrick McHardy.
Signed-off-by: Jarek Poplawski <jarkao2@o2.pl>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_output.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 32c1a972fa31..23e32c806916 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1650,7 +1650,8 @@ static void tcp_retrans_try_collapse(struct sock *sk, struct sk_buff *skb, int m memcpy(skb_put(skb, next_skb_size), next_skb->data, next_skb_size); - skb->ip_summed = next_skb->ip_summed; + if (next_skb->ip_summed == CHECKSUM_PARTIAL) + skb->ip_summed = CHECKSUM_PARTIAL; if (skb->ip_summed != CHECKSUM_PARTIAL) skb->csum = csum_block_add(skb->csum, next_skb->csum, skb_size); |