l2tp: take PMTU from tunnel UDP socket (f34c4a35) · Commits · 戴 / test

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>

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;

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