From 55f8e57a05126a75c87b1386e1cf85c496ff2996 Mon Sep 17 00:00:00 2001
From: Brendan McGrath <redmcg@redmandi.dyndns.org>
Date: Wed, 13 Dec 2017 22:14:57 +1100
Subject: [PATCH 3/7] ipv6: icmp6: Allow icmp messages to be looped back
Git-commit: 588753f1eb18978512b1c9b85fddb457d46f9033
Patch-mainline: 4.15-rc5
References: git-fixes

One example of when an ICMPv6 packet is required to be looped back is
when a host acts as both a Multicast Listener and a Multicast Router.

A Multicast Router will listen on address ff02::16 for MLDv2 messages.

Currently, MLDv2 messages originating from a Multicast Listener running
on the same host as the Multicast Router are not being delivered to the
Multicast Router. This is due to dst.input being assigned the default
value of dst_discard.

This results in the packet being looped back but discarded before being
delivered to the Multicast Router.

This patch sets dst.input to ip6_input to ensure a looped back packet
is delivered to the Multicast Router.

Signed-off-by: Brendan McGrath <redmcg@redmandi.dyndns.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
 net/ipv6/route.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index ff1c0fbc4a5e..2990fcf19878 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1682,6 +1682,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 	}
 
 	rt->dst.flags |= DST_HOST;
+	rt->dst.input = ip6_input;
 	rt->dst.output  = ip6_output;
 	rt->rt6i_gateway  = fl6->daddr;
 	rt->rt6i_dst.addr = fl6->daddr;
-- 
2.16.4