| From | Ben Hutchings <> | Date | Sun, 07 Apr 2013 23:45:43 +0100 | Subject | [66/74] ipv6: don't accept multicast traffic with scope 0 |
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3.2.43-rc1 review patch. If anyone has any objections, please let me know.
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From: Hannes Frederic Sowa <hannes@stressinduktion.org>
[ Upstream commit 20314092c1b41894d8c181bf9aa6f022be2416aa ]
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: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- net/ipv6/ip6_input.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index f8d24dd..15295e9 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -111,6 +111,15 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt ipv6_addr_loopback(&hdr->daddr)) 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 * Multicast addresses must not be used as source addresses in IPv6
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