4.4-stable review patch. If anyone has any objections, please let me know.
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From: Brendan McGrath redmcg@redmandi.dyndns.org
[ Upstream commit 588753f1eb18978512b1c9b85fddb457d46f9033 ]
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: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv6/route.c | 1 + 1 file changed, 1 insertion(+)
--- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1614,6 +1614,7 @@ struct dst_entry *icmp6_dst_alloc(struct }
rt->dst.flags |= DST_HOST; + rt->dst.input = ip6_input; rt->dst.output = ip6_output; atomic_set(&rt->dst.__refcnt, 1); rt->rt6i_gateway = fl6->daddr;