[PATCH 3.16.y-ckt 057/118] ipv6: Make MLD packets to only be processed locally

From: Luis Henriques
Date: Wed Aug 12 2015 - 05:27:50 EST


3.16.7-ckt16 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Angga <Hermin.Anggawijaya@xxxxxxxxxxxxxxxxxxx>

commit 4c938d22c88a9ddccc8c55a85e0430e9c62b1ac5 upstream.

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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
net/ipv6/ip6_input.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 51d54dc376f3..05c94d9c3776 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -329,10 +329,10 @@ 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 */
}
--
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