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Commit f34c4a35 authored by Dmitry Petukhov's avatar Dmitry Petukhov Committed by David S. Miller
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l2tp: take PMTU from tunnel UDP socket 



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>
parent 629c9a8f

net/l2tp/l2tp_ppp.c

+2 −2
Original line number Diff line number Diff line
@@ -753,9 +753,9 @@ 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;