Commit d135c522 authored Apr 22, 2012 by Neal Cardwell Committed by David S. Miller Apr 22, 2012

tcp: fix TCP_MAXSEG for established IPv6 passive sockets



Commit f5fff5dc 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>

parent 163faf31

net/ipv6/tcp_ipv6.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1383,6 +1383,10 @@ 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);
		if (tcp_rsk(req)->snt_synack)
		tcp_valid_rtt_meas(newsk,

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