Commit f32abfaa authored by Dmitry Petukhov's avatar Dmitry Petukhov Committed by Greg Kroah-Hartman

l2tp: take PMTU from tunnel UDP socket

[ Upstream commit f34c4a35 ]

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: default avatarDmitry Petukhov <dmgenp@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7658e7de
......@@ -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;
......
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