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authorYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-03-31 19:30:45 -0700
committerDavid S. Miller <davem@davemloft.net>2008-03-31 19:30:45 -0700
commit4c7966b86b910d6d4869aba1d7417d053ac9682c (patch)
treeec65994e682b6c3e05533ddd1bb15986687f8ea1
parent9f09243890a4e7d2e06d40b56f26a64f88c6ec8b (diff)
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[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>
-rw-r--r--net/ipv6/ip6_input.c3
1 files changed, 1 insertions, 2 deletions
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.