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l2tp: take PMTU from tunnel UDP socket

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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>
This commit is contained in:
Dmitry Petukhov 2014-04-09 02:23:20 +06:00 • committed by David S. Miller
commit f34c4a35d8
1 changed files with 2 additions and 2 deletions
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4
net/l2tp/l2tp_ppp.c
View file

@ -753,9 +753,9 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
session->deref = pppol2tp_session_sock_put; session->deref = pppol2tp_session_sock_put;
/* If PMTU discovery was enabled, use the MTU that was discovered */ /* 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) { if (dst != NULL) {
u32 pmtu = dst_mtu(__sk_dst_get(sk)); u32 pmtu = dst_mtu(__sk_dst_get(tunnel->sock));
if (pmtu != 0) if (pmtu != 0)
session->mtu = session->mru = pmtu - session->mtu = session->mru = pmtu -
PPPOL2TP_HEADER_OVERHEAD; PPPOL2TP_HEADER_OVERHEAD;