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authorHerbert Xu <herbert@gondor.apana.org.au>2009-06-28 18:03:30 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-29 19:41:39 -0700
commit8e5b9dda99cc86bdbd822935fcc37c5808e271b3 (patch)
tree216ce989fdac1d8ecd33698e8fae46fe0d4bb616 /net/ipv4/tcp_output.c
parent9c0346bd0891eb009f5cd08b868ff41c65804dbe (diff)
tcp: Stop non-TSO packets morphing into TSO
If a socket starts out on a non-TSO route, and then switches to a TSO route, then the tail on the tx queue can morph into a TSO packet, causing mischief because the rest of the stack does not expect a partially linear TSO packet. This patch fixes this by ensuring that skb->ip_summed is set to CHECKSUM_PARTIAL before declaring a packet as TSO. Reported-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 416fc4c2e7e..5bdf08d312d 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -725,7 +725,8 @@ static void tcp_queue_skb(struct sock *sk, struct sk_buff *skb)
static void tcp_set_skb_tso_segs(struct sock *sk, struct sk_buff *skb,
unsigned int mss_now)
{
- if (skb->len <= mss_now || !sk_can_gso(sk)) {
+ if (skb->len <= mss_now || !sk_can_gso(sk) ||
+ skb->ip_summed == CHECKSUM_NONE) {
/* Avoid the costly divide in the normal
* non-TSO case.
*/