ipv6: don't accept node local multicast traffic from the wire
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). Cc: Erik Hugne <erik.hugne@ericsson.com> Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -118,6 +118,18 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
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ipv6_addr_loopback(&hdr->daddr))
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goto err;
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/* RFC4291 Errata ID: 3480
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* Interface-Local scope spans only a single interface on a
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* node and is useful only for loopback transmission of
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* multicast. Packets with interface-local scope received
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* from another node must be discarded.
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*/
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if (!(skb->pkt_type == PACKET_LOOPBACK ||
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dev->flags & IFF_LOOPBACK) &&
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ipv6_addr_is_multicast(&hdr->daddr) &&
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IPV6_ADDR_MC_SCOPE(&hdr->daddr) == 1)
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goto err;
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/* RFC4291 2.7
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* Nodes must not originate a packet to a multicast address whose scope
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* field contains the reserved value 0; if such a packet is received, it
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