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

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

After commit ae7bf20a63, 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>
This commit is contained in:
YOSHIFUJI Hideaki 2008-03-31 19:30:45 -07:00 committed by David S. Miller
parent 9f09243890
commit 4c7966b86b
1 changed files with 1 additions and 2 deletions
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3
net/ipv6/ip6_input.c
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@ -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.