From 528738eb2da4924b5f8d74e99945bca1f9ca7bbd Mon Sep 17 00:00:00 2001 From: Dmitry Petukhov Date: Wed, 9 Apr 2014 02:23:20 +0600 Subject: [PATCH] l2tp: take PMTU from tunnel UDP socket [ Upstream commit f34c4a35d87949fbb0e0f31eba3c054e9f8199ba ] When l2tp driver tries to get PMTU for the tunnel destination, it uses the pointer to struct sock that represents PPPoX socket, while it should use the pointer that represents UDP socket of the tunnel. Signed-off-by: Dmitry Petukhov Signed-off-by: David S. Miller Signed-off-by: Jiri Slaby --- net/l2tp/l2tp_ppp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index 44441c0c50374..9a0e5874e73e9 100644 --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -754,9 +754,9 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr, session->deref = pppol2tp_session_sock_put; /* If PMTU discovery was enabled, use the MTU that was discovered */ - dst = sk_dst_get(sk); + dst = sk_dst_get(tunnel->sock); if (dst != NULL) { - u32 pmtu = dst_mtu(__sk_dst_get(sk)); + u32 pmtu = dst_mtu(__sk_dst_get(tunnel->sock)); if (pmtu != 0) session->mtu = session->mru = pmtu - PPPOL2TP_HEADER_OVERHEAD; -- 2.47.3