Commit a8fdf2b3 authored by Cosmin Ratiu's avatar Cosmin Ratiu Committed by David S. Miller

ipv6: Fix tcp_v6_send_response(): it didn't set skb transport header

Here is a patch which fixes an issue observed when using TCP over IPv6
and AH from IPsec.

When a connection gets closed the 4-way method and the last ACK from
the server gets dropped, the subsequent FINs from the client do not
get ACKed because tcp_v6_send_response does not set the transport
header pointer. This causes ah6_output to try to allocate a lot of
memory, which typically fails, so the ACKs never make it out of the
stack.

I have reproduced the problem on kernel 2.6.7, but after looking at
the latest kernel it seems the problem is still there.
Signed-off-by: default avatarCosmin Ratiu <cratiu@ixiacom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6fdfa970
...@@ -1003,6 +1003,7 @@ static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, ...@@ -1003,6 +1003,7 @@ static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
t1 = (struct tcphdr *) skb_push(buff, tot_len); t1 = (struct tcphdr *) skb_push(buff, tot_len);
skb_reset_transport_header(skb);
/* Swap the send and the receive. */ /* Swap the send and the receive. */
memset(t1, 0, sizeof(*t1)); memset(t1, 0, sizeof(*t1));
......
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