Commit 7ddacfa5 authored Nov 18, 2018 by David Ahern Committed by David S. Miller Nov 18, 2018

ipv6: Fix PMTU updates for UDP/raw sockets in presence of VRF



Preethi reported that PMTU discovery for UDP/raw applications is not
working in the presence of VRF when the socket is not bound to a device.
The problem is that ip6_sk_update_pmtu does not consider the L3 domain
of the skb device if the socket is not bound. Update the function to
set oif to the L3 master device if relevant.

Fixes: ca254490 ("net: Add VRF support to IPv6 stack")
Reported-by: Preethi Ramachandra <preethir@juniper.net>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 1c1274a5

net/ipv6/route.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -2359,10 +2359,13 @@ EXPORT_SYMBOL_GPL(ip6_update_pmtu);

		void ip6_sk_update_pmtu(struct sk_buff skb, struct sock sk, __be32 mtu)
		{
		int oif = sk->sk_bound_dev_if;
		struct dst_entry *dst;

		ip6_update_pmtu(skb, sock_net(sk), mtu,
		sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
		if (!oif && skb->dev)
		oif = l3mdev_master_ifindex(skb->dev);

		ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);

		dst = __sk_dst_get(sk);
		if (!dst \|\| !dst->obsolete \|\|

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