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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-02-10 09:35:22 +0400
committerDavid S. Miller <davem@davemloft.net>2013-02-11 23:00:54 +0400
commit20314092c1b41894d8c181bf9aa6f022be2416aa (patch)
tree7b4f864e1c88ec8f48a9662258943c973f9b7bb3 /net/ipv6/ip6_input.c
parentdd40851521361e07c1f61e79cca941a63ad311bc (diff)
downloadlinux-20314092c1b41894d8c181bf9aa6f022be2416aa.tar.xz
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: 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>
Diffstat (limited to 'net/ipv6/ip6_input.c')
-rw-r--r--net/ipv6/ip6_input.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 4ac5bf30e16a..5b10414e619e 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -118,6 +118,15 @@ 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