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kernel: bridge: multicast: backport a few more fixes for 3.10

Browse Source 
The following patches unfortunately didn't hit the kernel stable
branches yet, therefore cherrypicking them for OpenWRT here:

* bridge: fix netfilter/NF_BR_LOCAL_OUT for own, locally generated queries
* bridge: multicast: enable snooping on general queries only
* bridge: multicast: add sanity check for general query destination

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>

SVN-Revision: 43841
This commit is contained in:
Felix Fietkau 2015-01-05 13:02:31 +00:00
parent 36fa8e4ce2
commit 2b9379052e
2 changed files with 162 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

193
target/linux/generic/patches-3.10/070-net_bridge_backports.patch
View File

@ -1,3 +1,88 @@
commit f0b4eeced518c632210ef2aea44fc92cc9e86cce
Author: Linus Lüssing <linus.luessing@web.de>
Date: Mon Nov 17 12:20:28 2014 +0100
bridge: fix netfilter/NF_BR_LOCAL_OUT for own, locally generated queries
Ebtables on the OUTPUT chain (NF_BR_LOCAL_OUT) would not work as expected
for both locally generated IGMP and MLD queries. The IP header specific
filter options are off by 14 Bytes for netfilter (actual output on
interfaces is fine).
NF_HOOK() expects the skb->data to point to the IP header, not the
ethernet one (while dev_queue_xmit() does not). Luckily there is an
br_dev_queue_push_xmit() helper function already - let's just use that.
Introduced by eb1d16414339a6e113d89e2cca2556005d7ce919
("bridge: Add core IGMP snooping support")
Ebtables example:
$ ebtables -I OUTPUT -p IPv6 -o eth1 --logical-out br0 \
--log --log-level 6 --log-ip6 --log-prefix="~EBT: " -j DROP
before (broken):
~EBT: IN= OUT=eth1 MAC source = 02:04:64:a4:39:c2 \
MAC dest = 33:33:00:00:00:01 proto = 0x86dd IPv6 \
SRC=64a4:39c2:86dd:6000:0000:0020:0001:fe80 IPv6 \
DST=0000:0000:0000:0004:64ff:fea4:39c2:ff02, \
IPv6 priority=0x3, Next Header=2
after (working):
~EBT: IN= OUT=eth1 MAC source = 02:04:64:a4:39:c2 \
MAC dest = 33:33:00:00:00:01 proto = 0x86dd IPv6 \
SRC=fe80:0000:0000:0000:0004:64ff:fea4:39c2 IPv6 \
DST=ff02:0000:0000:0000:0000:0000:0000:0001, \
IPv6 priority=0x0, Next Header=0
Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
commit 20a599bec95a52fa72432b2376a2ce47c5bb68fb
Author: Linus Lüssing <linus.luessing@web.de>
Date: Mon Mar 10 22:25:25 2014 +0100
bridge: multicast: enable snooping on general queries only
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@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
commit 9ed973cc40c588abeaa58aea0683ea665132d11d
Author: Linus Lüssing <linus.luessing@web.de>
Date: Mon Mar 10 22:25:24 2014 +0100
bridge: multicast: add sanity check for general query destination
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>
commit 3c3769e63301fd92fcaf51870c371583dd0282ce
Author: Linus Lüssing <linus.luessing@web.de>
Date: Wed Sep 4 02:13:39 2013 +0200
@ -229,7 +314,17 @@ Date: Tue May 21 21:52:54 2013 +0000
static void __br_multicast_send_query(struct net_bridge *br,
struct net_bridge_port *port,
struct br_ip *ip)
@@ -790,37 +809,45 @@ static void __br_multicast_send_query(st
@@ -781,46 +800,53 @@ static void __br_multicast_send_query(st
return;
if (port) {
- __skb_push(skb, sizeof(struct ethhdr));
skb->dev = port->dev;
NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
- dev_queue_xmit);
+ br_dev_queue_push_xmit);
} else
netif_rx(skb);
}
static void br_multicast_send_query(struct net_bridge *br,
@ -288,7 +383,7 @@ Date: Tue May 21 21:52:54 2013 +0000
struct net_bridge *br = port->br;
spin_lock(&br->multicast_lock);
@@ -828,25 +855,43 @@ static void br_multicast_port_query_expi
@@ -828,25 +854,43 @@ static void br_multicast_port_query_expi
port->state == BR_STATE_BLOCKING)
goto out;
@ -339,7 +434,7 @@ Date: Tue May 21 21:52:54 2013 +0000
}
void br_multicast_del_port(struct net_bridge_port *port)
@@ -854,13 +899,13 @@ void br_multicast_del_port(struct net_br
@@ -854,13 +898,13 @@ void br_multicast_del_port(struct net_br
del_timer_sync(&port->multicast_router_timer);
}
@ -358,7 +453,7 @@ Date: Tue May 21 21:52:54 2013 +0000
}
void br_multicast_enable_port(struct net_bridge_port *port)
@@ -871,7 +916,10 @@ void br_multicast_enable_port(struct net
@@ -871,7 +915,10 @@ void br_multicast_enable_port(struct net
if (br->multicast_disabled || !netif_running(br->dev))
goto out;
@ -370,7 +465,7 @@ Date: Tue May 21 21:52:54 2013 +0000
out:
spin_unlock(&br->multicast_lock);
@@ -890,7 +938,10 @@ void br_multicast_disable_port(struct ne
@@ -890,7 +937,10 @@ void br_multicast_disable_port(struct ne
if (!hlist_unhashed(&port->rlist))
hlist_del_init_rcu(&port->rlist);
del_timer(&port->multicast_router_timer);
@ -382,7 +477,7 @@ Date: Tue May 21 21:52:54 2013 +0000
spin_unlock(&br->multicast_lock);
}
@@ -1015,6 +1066,17 @@ static int br_ip6_multicast_mld2_report(
@@ -1015,6 +1065,17 @@ static int br_ip6_multicast_mld2_report(
}
#endif
@ -400,19 +495,22 @@ Date: Tue May 21 21:52:54 2013 +0000
/*
* Add port to rotuer_list
* list is maintained ordered by pointer value
@@ -1065,12 +1127,13 @@ timer:
@@ -1065,12 +1126,14 @@ timer:
static void br_multicast_query_received(struct net_bridge *br,
struct net_bridge_port *port,
- int saddr)
+ struct bridge_mcast_querier *querier,
+ int saddr,
+ unsigned long max_delay)
{
if (saddr)
-{
- if (saddr)
- mod_timer(&br->multicast_querier_timer,
- jiffies + br->multicast_querier_interval);
- else if (timer_pending(&br->multicast_querier_timer))
+ struct bridge_mcast_querier *querier,
+ int saddr,
+ bool is_general_query,
+ unsigned long max_delay)
+{
+ if (saddr && is_general_query)
+ br_multicast_update_querier_timer(br, querier, max_delay);
+ else if (timer_pending(&querier->timer))
return;
@ -427,17 +525,33 @@ Date: Tue May 21 21:52:54 2013 +0000
group = ih->group;
if (skb->len == sizeof(*ih)) {
@@ -1122,6 +1183,9 @@ static int br_ip4_multicast_query(struct
@@ -1122,6 +1183,17 @@ static int br_ip4_multicast_query(struct
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);
+ !group, max_delay);
+
if (!group)
goto out;
@@ -1174,8 +1238,6 @@ static int br_ip6_multicast_query(struct
@@ -1166,6 +1238,7 @@ static int br_ip6_multicast_query(struct
unsigned long max_delay;
unsigned long now = jiffies;
const struct in6_addr *group = NULL;
+ bool is_general_query;
int err = 0;
u16 vid = 0;
@@ -1174,8 +1247,6 @@ static int br_ip6_multicast_query(struct
(port && port->state == BR_STATE_DISABLED))
goto out;
@ -446,17 +560,28 @@ Date: Tue May 21 21:52:54 2013 +0000
/* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
err = -EINVAL;
@@ -1203,6 +1265,9 @@ static int br_ip6_multicast_query(struct
@@ -1203,6 +1274,20 @@ static int br_ip6_multicast_query(struct
max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mld2q->mld2q_mrc))), 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);
+ !ipv6_addr_any(&ip6h->saddr),
+ is_general_query, max_delay);
+
if (!group)
goto out;
@@ -1235,7 +1300,9 @@ out:
@@ -1235,7 +1320,9 @@ out:
static void br_multicast_leave_group(struct net_bridge *br,
struct net_bridge_port *port,
@ -467,7 +592,7 @@ Date: Tue May 21 21:52:54 2013 +0000
{
struct net_bridge_mdb_htable *mdb;
struct net_bridge_mdb_entry *mp;
@@ -1246,7 +1313,7 @@ static void br_multicast_leave_group(str
@@ -1246,7 +1333,7 @@ static void br_multicast_leave_group(str
spin_lock(&br->multicast_lock);
if (!netif_running(br->dev) ||
(port && port->state == BR_STATE_DISABLED) ||
@ -476,7 +601,7 @@ Date: Tue May 21 21:52:54 2013 +0000
goto out;
mdb = mlock_dereference(br->mdb, br);
@@ -1254,6 +1321,31 @@ static void br_multicast_leave_group(str
@@ -1254,6 +1341,31 @@ static void br_multicast_leave_group(str
if (!mp)
goto out;
@ -508,7 +633,7 @@ Date: Tue May 21 21:52:54 2013 +0000
if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
struct net_bridge_port_group __rcu **pp;
@@ -1306,7 +1398,6 @@ static void br_multicast_leave_group(str
@@ -1306,7 +1418,6 @@ static void br_multicast_leave_group(str
break;
}
@ -516,7 +641,7 @@ Date: Tue May 21 21:52:54 2013 +0000
out:
spin_unlock(&br->multicast_lock);
}
@@ -1317,6 +1408,8 @@ static void br_ip4_multicast_leave_group
@@ -1317,6 +1428,8 @@ static void br_ip4_multicast_leave_group
__u16 vid)
{
struct br_ip br_group;
@ -525,7 +650,7 @@ Date: Tue May 21 21:52:54 2013 +0000
if (ipv4_is_local_multicast(group))
return;
@@ -1325,7 +1418,7 @@ static void br_ip4_multicast_leave_group
@@ -1325,7 +1438,7 @@ static void br_ip4_multicast_leave_group
br_group.proto = htons(ETH_P_IP);
br_group.vid = vid;
@ -534,7 +659,7 @@ Date: Tue May 21 21:52:54 2013 +0000
}
#if IS_ENABLED(CONFIG_IPV6)
@@ -1335,15 +1428,18 @@ static void br_ip6_multicast_leave_group
@@ -1335,15 +1448,18 @@ static void br_ip6_multicast_leave_group
__u16 vid)
{
struct br_ip br_group;
@ -555,7 +680,7 @@ Date: Tue May 21 21:52:54 2013 +0000
}
#endif
@@ -1473,8 +1569,14 @@ static int br_multicast_ipv6_rcv(struct
@@ -1473,8 +1589,14 @@ static int br_multicast_ipv6_rcv(struct
* - MLD has always Router Alert hop-by-hop option
* - But we do not support jumbrograms.
*/
@ -572,7 +697,7 @@ Date: Tue May 21 21:52:54 2013 +0000
ip6h->payload_len == 0)
return 0;
@@ -1605,19 +1707,32 @@ int br_multicast_rcv(struct net_bridge *
@@ -1605,19 +1727,32 @@ int br_multicast_rcv(struct net_bridge *
return 0;
}
@ -612,7 +737,7 @@ Date: Tue May 21 21:52:54 2013 +0000
void br_multicast_init(struct net_bridge *br)
{
@@ -1626,6 +1741,7 @@ void br_multicast_init(struct net_bridge
@@ -1626,6 +1761,7 @@ void br_multicast_init(struct net_bridge
br->multicast_router = 1;
br->multicast_querier = 0;
@ -620,7 +745,7 @@ Date: Tue May 21 21:52:54 2013 +0000
br->multicast_last_member_count = 2;
br->multicast_startup_query_count = 2;
@@ -1636,23 +1752,43 @@ void br_multicast_init(struct net_bridge
@@ -1636,23 +1772,43 @@ void br_multicast_init(struct net_bridge
br->multicast_querier_interval = 255 * HZ;
br->multicast_membership_interval = 260 * HZ;
@ -670,7 +795,7 @@ Date: Tue May 21 21:52:54 2013 +0000
}
void br_multicast_stop(struct net_bridge *br)
@@ -1664,8 +1800,12 @@ void br_multicast_stop(struct net_bridge
@@ -1664,8 +1820,12 @@ void br_multicast_stop(struct net_bridge
int i;
del_timer_sync(&br->multicast_router_timer);
@ -685,7 +810,7 @@ Date: Tue May 21 21:52:54 2013 +0000
spin_lock_bh(&br->multicast_lock);
mdb = mlock_dereference(br->mdb, br);
@@ -1767,18 +1907,24 @@ unlock:
@@ -1767,18 +1927,24 @@ unlock:
return err;
}
@ -713,7 +838,7 @@ Date: Tue May 21 21:52:54 2013 +0000
}
}
@@ -1813,7 +1959,10 @@ rollback:
@@ -1813,7 +1979,10 @@ rollback:
goto rollback;
}
@ -725,7 +850,7 @@ Date: Tue May 21 21:52:54 2013 +0000
unlock:
spin_unlock_bh(&br->multicast_lock);
@@ -1823,6 +1972,8 @@ unlock:
@@ -1823,6 +1992,8 @@ unlock:
int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
{
@ -734,7 +859,7 @@ Date: Tue May 21 21:52:54 2013 +0000
val = !!val;
spin_lock_bh(&br->multicast_lock);
@@ -1830,8 +1981,22 @@ int br_multicast_set_querier(struct net_
@@ -1830,8 +2001,22 @@ int br_multicast_set_querier(struct net_
goto unlock;
br->multicast_querier = val;
@ -918,7 +1043,7 @@ Date: Tue May 21 21:52:54 2013 +0000
static ssize_t show_multicast_querier(struct device *d,
struct device_attribute *attr,
char *buf)
@@ -734,6 +759,7 @@ static struct attribute *bridge_attrs[]
@@ -734,6 +759,7 @@ static struct attribute *bridge_attrs[]
&dev_attr_multicast_router.attr,
&dev_attr_multicast_snooping.attr,
&dev_attr_multicast_querier.attr,

6
target/linux/generic/patches-3.10/644-bridge_optimize_netfilter_hooks.patch
View File

@ -67,13 +67,13 @@
default:
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -802,7 +802,7 @@ static void __br_multicast_send_query(st
@@ -801,7 +801,7 @@ static void __br_multicast_send_query(st
if (port) {
__skb_push(skb, sizeof(struct ethhdr));
skb->dev = port->dev;
- NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
+ BR_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
dev_queue_xmit);
br_dev_queue_push_xmit);
} else
netif_rx(skb);
--- a/net/bridge/br_netfilter.c