bridge: multicast: add sanity check for general query destination (9ed973cc) · Commits · 戴 / test

General IGMP and MLD queries are supposed to have the multicast link-local all-nodes address as their destination according to RFC2236 section 9, RFC3376 section 4.1.12/9.1, RFC2710 section 8 and RFC3810 section 5.1.15. Without this check, such malformed IGMP/MLD queries can result in a denial of service: The queries are ignored by most IGMP/MLD listeners therefore they will not respond with an IGMP/MLD report. However, without this patch these malformed MLD queries would enable the snooping part in the bridge code, potentially shutting down the according ports towards these hosts for multicast traffic as the bridge did not learn about these listeners. Reported-by:

Jan Stancek <jstancek@redhat.com> Signed-off-by:

Linus Lüssing <linus.luessing@web.de> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/bridge/br_multicast.c

+19 −0

Original line number	Diff line number	Diff line
		@@ -1181,6 +1181,14 @@ static int br_ip4_multicast_query(struct net_bridge *br,
		IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
		}

		/* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
		* all-systems destination addresses (224.0.0.1) for general queries
		*/
		if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
		err = -EINVAL;
		goto out;
		}

		br_multicast_query_received(br, port, &br->ip4_querier, !!iph->saddr,
		max_delay);

		@@ -1228,6 +1236,7 @@ static int br_ip6_multicast_query(struct net_bridge *br,
		unsigned long max_delay;
		unsigned long now = jiffies;
		const struct in6_addr *group = NULL;
		bool is_general_query;
		int err = 0;

		spin_lock(&br->multicast_lock);
		@@ -1262,6 +1271,16 @@ static int br_ip6_multicast_query(struct net_bridge *br,
		max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
		}

		is_general_query = group && ipv6_addr_any(group);

		/* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
		* all-nodes destination address (ff02::1) for general queries
		*/
		if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
		err = -EINVAL;
		goto out;
		}

		br_multicast_query_received(br, port, &br->ip6_querier,
		!ipv6_addr_any(&ip6h->saddr), max_delay);

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