ipv6: Make MLD packets to only be processed locally

[ Upstream commit 4c938d22c88a9ddccc8c55a85e0430e9c62b1ac5 ]

Before commit daad151263cf ("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: daad151263cf ("ipv6: Make ipv6_is_mld() inline and use it from ip6_mc_input().")
Signed-off-by: Hermin Anggawijaya <hermin.anggawijaya@alliedtelesis.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 774b09cb2920f920b79af829687fe148ae27a3b4..63264c9a15cb4083ad465fadcbc399f35bacf76f 100644 (file)
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -325,10 +325,10 @@ 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 */
                }