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l2tp: take PMTU from tunnel UDP socket

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[ Upstream commit f34c4a35d8 ]

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 <dmgenp@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Petukhov
2014-04-09 02:23:20 +06:00
committed by Greg Kroah-Hartman
parent 7658e7de68
commit f32abfaa76
1 changed files with 2 additions and 2 deletions
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4
net/l2tp/l2tp_ppp.c
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@ -772,9 +772,9 @@ 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;