This is a note to let you know that I've just added the patch titled
bridge: multicast: enable snooping on general queries only
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bridge-multicast-enable-snooping-on-general-queries-only.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Apr 10 22:03:04 PDT 2014
From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@xxxxxx>
Date: Mon, 10 Mar 2014 22:25:25 +0100
Subject: bridge: multicast: enable snooping on general queries only
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From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@xxxxxx>
[ Upstream commit 20a599bec95a52fa72432b2376a2ce47c5bb68fb ]
Without this check someone could easily create a denial of service
by injecting multicast-specific queries to enable the bridge
snooping part if no real querier issuing periodic general queries
is present on the link which would result in the bridge wrongly
shutting down ports for multicast traffic as the bridge did not learn
about these listeners.
With this patch the snooping code is enabled upon receiving valid,
general queries only.
Signed-off-by: Linus Lüssing <linus.luessing@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/bridge/br_multicast.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1127,9 +1127,10 @@ static void br_multicast_query_received(
struct net_bridge_port *port,
struct bridge_mcast_querier *querier,
int saddr,
+ bool is_general_query,
unsigned long max_delay)
{
- if (saddr)
+ if (saddr && is_general_query)
br_multicast_update_querier_timer(br, querier, max_delay);
else if (timer_pending(&querier->timer))
return;
@@ -1190,7 +1191,7 @@ static int br_ip4_multicast_query(struct
}
br_multicast_query_received(br, port, &br->ip4_querier, !!iph->saddr,
- max_delay);
+ !group, max_delay);
if (!group)
goto out;
@@ -1282,7 +1283,8 @@ static int br_ip6_multicast_query(struct
}
br_multicast_query_received(br, port, &br->ip6_querier,
- !ipv6_addr_any(&ip6h->saddr), max_delay);
+ !ipv6_addr_any(&ip6h->saddr),
+ is_general_query, max_delay);
if (!group)
goto out;
Patches currently in stable-queue which might be from linus.luessing@xxxxxx are
queue-3.13/bridge-multicast-add-sanity-check-for-query-source.patch
queue-3.13/bridge-multicast-add-sanity-check-for-general-query-destination.patch
queue-3.13/bridge-multicast-enable-snooping-on-general-queries-only.patch
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