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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-03-26 08:13:34 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-05 09:26:19 -0700
commitc3b57ba21bf0a1fe812424c51ea9229d9070ff6a (patch)
treeea5348b018b25566b07d40788c91c5078a15acd0 /net
parentbe0013681e301ab076b472f46de5afb1407b756c (diff)
ipv6: don't accept node local multicast traffic from the wire
[ Upstream commit 1c4a154e5253687c51123956dfcee9e9dfa8542d ] Erik Hugne's errata proposal (Errata ID: 3480) to RFC4291 has been verified: http://www.rfc-editor.org/errata_search.php?eid=3480 We have to check for pkt_type and loopback flag because either the packets are allowed to travel over the loopback interface (in which case pkt_type is PACKET_HOST and IFF_LOOPBACK flag is set) or they travel over a non-loopback interface back to us (in which case PACKET_TYPE is PACKET_LOOPBACK and IFF_LOOPBACK flag is not set). Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Cc: Erik Hugne <erik.hugne@ericsson.com> Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/ip6_input.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index db70b8819a2..dee9964f9cb 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -118,6 +118,18 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
ipv6_addr_loopback(&hdr->daddr))
goto err;
+ /* RFC4291 Errata ID: 3480
+ * Interface-Local scope spans only a single interface on a
+ * node and is useful only for loopback transmission of
+ * multicast. Packets with interface-local scope received
+ * from another node must be discarded.
+ */
+ if (!(skb->pkt_type == PACKET_LOOPBACK ||
+ dev->flags & IFF_LOOPBACK) &&
+ ipv6_addr_is_multicast(&hdr->daddr) &&
+ IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1)
+ 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