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authorNeal Cardwell <ncardwell@google.com>2012-04-22 09:45:47 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-27 09:51:21 -0700
commitad24d0be9d68b8907bcdd170649214db4ce6a55c (patch)
tree2cb00c49b848ffeb4723e9237b9f1e92e49f2514
parent28b78eb401b7e60c0984eacf3837cf09a2307253 (diff)
tcp: fix TCP_MAXSEG for established IPv6 passive sockets
[ Upstream commit d135c522f1234f62e81be29cebdf59e9955139ad ] Commit f5fff5d forgot to fix TCP_MAXSEG behavior IPv6 sockets, so IPv6 TCP server sockets that used TCP_MAXSEG would find that the advmss of child sockets would be incorrect. This commit mirrors the advmss logic from tcp_v4_syn_recv_sock in tcp_v6_syn_recv_sock. Eventually this logic should probably be shared between IPv4 and IPv6, but this at least fixes this issue. Signed-off-by: Neal Cardwell <ncardwell@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/ipv6/tcp_ipv6.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 51587a01627a..848f9634bbdf 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1514,6 +1514,10 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
tcp_mtup_init(newsk);
tcp_sync_mss(newsk, dst_mtu(dst));
newtp->advmss = dst_metric_advmss(dst);
+ if (tcp_sk(sk)->rx_opt.user_mss &&
+ tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
+ newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
+
tcp_initialize_rcv_mss(newsk);
newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;