[PATCH] ipv6: Make MLD packets to only be processed locally.

[Angga]

Before commit daad151263cf334 ("ipv6: Make ipv6_is_mld() inline and use it
from ip6_mc_input()." MLD packets were only processed locally. After the
change, a copy of MLD packet goes through ip6_mr_input, causing
MRT6MSG_NOCACHE message to be generated to user space.

Make MLD packet only processed locally.

Fixes: daad151263cf334 ("ipv6: Make ipv6_is_mld() inline and use it from 
ip6_mc_input().")

Signed-off-by: Hermin Anggawijaya <hermin.anggawij...@alliedtelesis.co.nz>
---

diff --git a/linux/net/ipv6/ip6_input.c.orig b/linux/net/ipv6/ip6_input.c
index f2e464e..57990c9 100644
--- a/linux/net/ipv6/ip6_input.c.orig
+++ b/linux/net/ipv6/ip6_input.c
@@ -331,10 +331,10 @@ int ip6_mc_input(struct sk_buff *skb)
                                 if (offset < 0)
                                         goto out;

-                               if (!ipv6_is_mld(skb, nexthdr, offset))
-                                       goto out;
+                               if (ipv6_is_mld(skb, nexthdr, offset))
+                                       deliver = true;

-                               deliver = true;
+                               goto out;
                         }
                         /* unknown RA - process it normally */
                 }