From: Dmitry Petukhov Date: Tue, 8 Apr 2014 20:23:20 +0000 (+0600) Subject: l2tp: take PMTU from tunnel UDP socket X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=6ea4dd539a9a5994c215ce48377483f7dba01613;p=linux-edison.git 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: Greg Kroah-Hartman --- diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c index 44441c0c503..9a0e5874e73 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;