From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Date: Tue, 1 Apr 2008 02:30:45 +0000 (-0700)
Subject: [IPV6] MCAST: Ensure to check multicast listener(s).
X-Git-Tag: v2.6.25-rc9~99^2~17
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4c7966b86b910d6d4869aba1d7417d053ac9682c;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

[IPV6] MCAST: Ensure to check multicast listener(s).

In ip6_mc_input(), we need to check whether we have listener(s) for
the packet.

After commit ae7bf20a6316272acfcaef5d265b18aaa54b41e4, all packets
for multicast destinations are delivered to upper layer if
IFF_PROMISC or IFF_ALLMULTI is set.

In fact, bug was rather ancient; the original (before the commit)
intent of the dev->flags check was to skip the ipv6_chk_mcast_addr()
call, assuming L2 filters packets appropriately, but it was even not
true.

Let's explicitly check our multicast list.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 178aebc..98ab4f4 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -239,8 +239,7 @@ int ip6_mc_input(struct sk_buff *skb)
 	IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS);
 
 	hdr = ipv6_hdr(skb);
-	deliver = unlikely(skb->dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) ||
-	    ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
+	deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
 
 	/*
 	 *	IPv6 multicast router mode isnt currently supported.