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Date:	Sat, 12 May 2007 18:51:35 -0400
From:	Corey Mutter <>
Subject: [PATCH 1/1] Reverse sense of promisc tests in ip6_mc_input

From: Corey Mutter <>

Reverse the sense of the promiscuous-mode tests in ip6_mc_input(). 

Signed-off-by: Corey Mutter <>


I had been suspicious of this code for a while, but just assumed I must 
have been missing something. However, I did some tests and, sure enough, 
I can open a socket and it will see IPv6 multicast packets come in, then 
the packets will stop coming in when I turn on IFF_ALLMULTI on the 

In my tests, this change works more like I'd expect; I can open a 
socket, and it doesn't see any multicast packets (unless I join a group 
or something) until after I turn on IFF_ALLMULTI. 

--- linux-	2007-04-27 17:49:26.000000000 -0400
+++ linux/net/ipv6/ip6_input.c	2007-05-12 18:19:09.597750000 -0400
@@ -235,7 +235,7 @@ int ip6_mc_input(struct sk_buff *skb)
 	IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS);
 	hdr = skb->nh.ipv6h;
-	deliver = likely(!(skb->dev->flags & (IFF_PROMISC|IFF_ALLMULTI))) ||
+	deliver = unlikely(skb->dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) ||
 	    ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
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