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tcp: fix TCP_MAXSEG for established IPv6 passive sockets

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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>
This commit is contained in:
Neal Cardwell 2012-04-22 09:45:47 +00:00 committed by David S. Miller
parent 163faf3177
commit d135c522f1
1 changed files with 4 additions and 0 deletions
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4
net/ipv6/tcp_ipv6.c
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@ -1383,6 +1383,10 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
tcp_mtup_init(newsk); tcp_mtup_init(newsk);
tcp_sync_mss(newsk, dst_mtu(dst)); tcp_sync_mss(newsk, dst_mtu(dst));
newtp->advmss = dst_metric_advmss(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); tcp_initialize_rcv_mss(newsk);
if (tcp_rsk(req)->snt_synack) if (tcp_rsk(req)->snt_synack)
tcp_valid_rtt_meas(newsk, tcp_valid_rtt_meas(newsk,