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Commit 20314092 authored by Hannes Frederic Sowa's avatar Hannes Frederic Sowa Committed by David S. Miller
Browse files

ipv6: don't accept multicast traffic with scope 0 



v2:
a) moved before multicast source address check
b) changed comment to netdev style

Cc: Erik Hugne <erik.hugne@ericsson.com>
Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dd408515

net/ipv6/ip6_input.c

+9 −0
Original line number Original line Diff line number Diff line
@@ -118,6 +118,15 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt 
	    ipv6_addr_loopback(&hdr->daddr))

	    ipv6_addr_loopback(&hdr->daddr))

		goto err;

		goto err;





	/* RFC4291 2.7

	 * Nodes must not originate a packet to a multicast address whose scope

	 * field contains the reserved value 0; if such a packet is received, it

	 * must be silently dropped.

	 */

	if (ipv6_addr_is_multicast(&hdr->daddr) &&

	    IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 0)

		goto err;



	/*

	/*

	 * RFC4291 2.7

	 * RFC4291 2.7

	 * Multicast addresses must not be used as source addresses in IPv6

	 * Multicast addresses must not be used as source addresses in IPv6