linux.git/net/bridge, branch v4.13

bridge: switchdev: Clear forward mark when transmitting packet

2017-09-01T17:11:28+00:00

Commit 6bc506b4fb06 ("bridge: switchdev: Add forward mark support for
stacked devices") added the 'offload_fwd_mark' bit to the skb in order
to allow drivers to indicate to the bridge driver that they already
forwarded the packet in L2.

In case the bit is set, before transmitting the packet from each port,
the port's mark is compared with the mark stored in the skb's control
block. If both marks are equal, we know the packet arrived from a switch
device that already forwarded the packet and it's not re-transmitted.

However, if the packet is transmitted from the bridge device itself
(e.g., br0), we should clear the 'offload_fwd_mark' bit as the mark
stored in the skb's control block isn't valid.

This scenario can happen in rare cases where a packet was trapped during
L3 forwarding and forwarded by the kernel to a bridge device.

Fixes: 6bc506b4fb06 ("bridge: switchdev: Add forward mark support for stacked devices")
Signed-off-by: Ido Schimmel 
Reported-by: Yotam Gigi 
Tested-by: Yotam Gigi 
Reviewed-by: Jiri Pirko 
Acked-by: Nikolay Aleksandrov 
Signed-off-by: David S. Miller

bridge: check for null fdb->dst before notifying switchdev drivers

2017-08-28T23:14:00+00:00

current switchdev drivers dont seem to support offloading fdb
entries pointing to the bridge device which have fdb->dst
not set to any port. This patch adds a NULL fdb->dst check in
the switchdev notifier code.

This patch fixes the below NULL ptr dereference:
$bridge fdb add 00:02:00:00:00:33 dev br0 self

[   69.953374] BUG: unable to handle kernel NULL pointer dereference at
0000000000000008
[   69.954044] IP: br_switchdev_fdb_notify+0x29/0x80
[   69.954044] PGD 66527067
[   69.954044] P4D 66527067
[   69.954044] PUD 7899c067
[   69.954044] PMD 0
[   69.954044]
[   69.954044] Oops: 0000 [#1] SMP
[   69.954044] Modules linked in:
[   69.954044] CPU: 1 PID: 3074 Comm: bridge Not tainted 4.13.0-rc6+ #1
[   69.954044] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.7.5.1-0-g8936dbb-20141113_115728-nilsson.home.kraxel.org
04/01/2014
[   69.954044] task: ffff88007b827140 task.stack: ffffc90001564000
[   69.954044] RIP: 0010:br_switchdev_fdb_notify+0x29/0x80
[   69.954044] RSP: 0018:ffffc90001567918 EFLAGS: 00010246
[   69.954044] RAX: 0000000000000000 RBX: ffff8800795e0880 RCX:
00000000000000c0
[   69.954044] RDX: ffffc90001567920 RSI: 000000000000001c RDI:
ffff8800795d0600
[   69.954044] RBP: ffffc90001567938 R08: ffff8800795d0600 R09:
0000000000000000
[   69.954044] R10: ffffc90001567a88 R11: ffff88007b849400 R12:
ffff8800795e0880
[   69.954044] R13: ffff8800795d0600 R14: ffffffff81ef8880 R15:
000000000000001c
[   69.954044] FS:  00007f93d3085700(0000) GS:ffff88007fd00000(0000)
knlGS:0000000000000000
[   69.954044] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   69.954044] CR2: 0000000000000008 CR3: 0000000066551000 CR4:
00000000000006e0
[   69.954044] Call Trace:
[   69.954044]  fdb_notify+0x3f/0xf0
[   69.954044]  __br_fdb_add.isra.12+0x1a7/0x370
[   69.954044]  br_fdb_add+0x178/0x280
[   69.954044]  rtnl_fdb_add+0x10a/0x200
[   69.954044]  rtnetlink_rcv_msg+0x1b4/0x240
[   69.954044]  ? skb_free_head+0x21/0x40
[   69.954044]  ? rtnl_calcit.isra.18+0xf0/0xf0
[   69.954044]  netlink_rcv_skb+0xed/0x120
[   69.954044]  rtnetlink_rcv+0x15/0x20
[   69.954044]  netlink_unicast+0x180/0x200
[   69.954044]  netlink_sendmsg+0x291/0x370
[   69.954044]  ___sys_sendmsg+0x180/0x2e0
[   69.954044]  ? filemap_map_pages+0x2db/0x370
[   69.954044]  ? do_wp_page+0x11d/0x420
[   69.954044]  ? __handle_mm_fault+0x794/0xd80
[   69.954044]  ? vma_link+0xcb/0xd0
[   69.954044]  __sys_sendmsg+0x4c/0x90
[   69.954044]  SyS_sendmsg+0x12/0x20
[   69.954044]  do_syscall_64+0x63/0xe0
[   69.954044]  entry_SYSCALL64_slow_path+0x25/0x25
[   69.954044] RIP: 0033:0x7f93d2bad690
[   69.954044] RSP: 002b:00007ffc7217a638 EFLAGS: 00000246 ORIG_RAX:
000000000000002e
[   69.954044] RAX: ffffffffffffffda RBX: 00007ffc72182eac RCX:
00007f93d2bad690
[   69.954044] RDX: 0000000000000000 RSI: 00007ffc7217a670 RDI:
0000000000000003
[   69.954044] RBP: 0000000059a1f7f8 R08: 0000000000000006 R09:
000000000000000a
[   69.954044] R10: 00007ffc7217a400 R11: 0000000000000246 R12:
00007ffc7217a670
[   69.954044] R13: 00007ffc72182a98 R14: 00000000006114c0 R15:
00007ffc72182aa0
[   69.954044] Code: 1f 00 66 66 66 66 90 55 48 89 e5 48 83 ec 20 f6 47
20 04 74 0a 83 fe 1c 74 09 83 fe 1d 74 2c c9 66 90 c3 48 8b 47 10 48 8d
55 e8 <48> 8b 70 08 0f b7 47 1e 48 83 c7 18 48 89 7d f0 bf 03 00 00 00
[   69.954044] RIP: br_switchdev_fdb_notify+0x29/0x80 RSP:
ffffc90001567918
[   69.954044] CR2: 0000000000000008
[   69.954044] ---[ end trace 03e9eec4a82c238b ]---

Fixes: 6b26b51b1d13 ("net: bridge: Add support for notifying devices about FDB add/del")
Signed-off-by: Roopa Prabhu 
Signed-off-by: David S. Miller

net: bridge: fix dest lookup when vlan proto doesn't match

2017-07-14T15:19:23+00:00

With 802.1ad support the vlan_ingress code started checking for vlan
protocol mismatch which causes the current tag to be inserted and the
bridge vlan protocol & pvid to be set. The vlan tag insertion changes
the skb mac_header and thus the lookup mac dest pointer which was loaded
prior to calling br_allowed_ingress in br_handle_frame_finish is VLAN_HLEN
bytes off now, pointing to the last two bytes of the destination mac and
the first four of the source mac causing lookups to always fail and
broadcasting all such packets to all ports. Same thing happens for locally
originated packets when passing via br_dev_xmit. So load the dest pointer
after the vlan checks and possible skb change.

Fixes: 8580e2117c06 ("bridge: Prepare for 802.1ad vlan filtering support")
Reported-by: Anitha Narasimha Murthy 
Signed-off-by: Nikolay Aleksandrov 
Acked-by: Toshiaki Makita 
Signed-off-by: David S. Miller

bridge: mdb: fix leak on complete_info ptr on fail path

2017-07-12T03:01:39+00:00

We currently get the following kmemleak report:
unreferenced object 0xffff8800039d9820 (size 32):
  comm "softirq", pid 0, jiffies 4295212383 (age 792.416s)
  hex dump (first 32 bytes):
    00 0c e0 03 00 88 ff ff ff 02 00 00 00 00 00 00  ................
    00 00 00 01 ff 11 00 02 86 dd 00 00 ff ff ff ff  ................
  backtrace:
    [] kmemleak_alloc+0x4a/0xa0
    [] kmem_cache_alloc_trace+0xb8/0x1c0
    [] __br_mdb_notify+0x2a3/0x300 [bridge]
    [] br_mdb_notify+0x6e/0x70 [bridge]
    [] br_multicast_add_group+0x109/0x150 [bridge]
    [] br_ip6_multicast_add_group+0x58/0x60 [bridge]
    [] br_multicast_rcv+0x1d5/0xdb0 [bridge]
    [] br_handle_frame_finish+0xcf/0x510 [bridge]
    [] br_nf_hook_thresh.part.27+0xb/0x10 [br_netfilter]
    [] br_nf_hook_thresh+0x48/0xb0 [br_netfilter]
    [] br_nf_pre_routing_finish_ipv6+0x109/0x1d0 [br_netfilter]
    [] br_nf_pre_routing_ipv6+0xd0/0x14c [br_netfilter]
    [] br_nf_pre_routing+0x197/0x3d0 [br_netfilter]
    [] nf_iterate+0x52/0x60
    [] nf_hook_slow+0x5c/0xb0
    [] br_handle_frame+0x1a4/0x2c0 [bridge]

This happens when switchdev_port_obj_add() fails. This patch
frees complete_info object in the fail path.

Reviewed-by: Vallish Vaidyeshwara 
Signed-off-by: Eduardo Valentin 
Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf

2017-07-06T13:02:22+00:00

Pablo Neira Ayuso says:

====================
Netfilter fixes for net

The following patchset contains two Netfilter fixes for your net tree,
they are:

1) Fix memleak from netns release path of conntrack protocol trackers,
   patch from Liping Zhang.

2) Uninitialized flags field in ebt_log, that results in unpredictable
   logging format in ebtables, also from Liping.
====================

Signed-off-by: David S. Miller

net, bridge: convert net_bridge_vlan.refcnt from atomic_t to refcount_t

2017-07-04T21:35:16+00:00

refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova 
Signed-off-by: Hans Liljestrand 
Signed-off-by: Kees Cook 
Signed-off-by: David Windsor 
Signed-off-by: David S. Miller

bridge: allow ext learned entries to change ports

2017-07-04T08:49:44+00:00

current code silently ignores change of port in the request
message. This patch makes sure the port is modified and
notification is sent to userspace.

Fixes: cf6b8e1eedff ("bridge: add API to notify bridge driver of learned FBD on offloaded device")
Signed-off-by: Nikolay Aleksandrov 
Signed-off-by: Roopa Prabhu 
Signed-off-by: David S. Miller

net: convert nf_bridge_info.use from atomic_t to refcount_t

2017-07-01T14:39:07+00:00

refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova 
Signed-off-by: Hans Liljestrand 
Signed-off-by: Kees Cook 
Signed-off-by: David Windsor 
Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

2017-06-30T13:27:09+00:00

Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains Netfilter updates for your net-next
tree. This batch contains connection tracking updates for the cleanup
iteration path, patches from Florian Westphal:

X) Skip unconfirmed conntracks in nf_ct_iterate_cleanup_net(), just set
   dying bit to let the CPU release them.

X) Add nf_ct_iterate_destroy() to be used on module removal, to kill
   conntrack from all namespace.

X) Restart iteration on hashtable resizing, since both may occur at
   the same time.

X) Use the new nf_ct_iterate_destroy() to remove conntrack with NAT
   mapping on module removal.

X) Use nf_ct_iterate_destroy() to remove conntrack entries helper
   module removal, from Liping Zhang.

X) Use nf_ct_iterate_cleanup_net() to remove the timeout extension
   if user requests this, also from Liping.

X) Add net_ns_barrier() and use it from FTP helper, so make sure
   no concurrent namespace removal happens at the same time while
   the helper module is being removed.

X) Use NFPROTO_MAX in layer 3 conntrack protocol array, to reduce
   module size. Same thing in nf_tables.

Updates for the nf_tables infrastructure:

X) Prepare usage of the extended ACK reporting infrastructure for
   nf_tables.

X) Remove unnecessary forward declaration in nf_tables hash set.

X) Skip set size estimation if number of element is not specified.

X) Changes to accomodate a (faster) unresizable hash set implementation,
   for anonymous sets and dynamic size fixed sets with no timeouts.

X) Faster lookup function for unresizable hash table for 2 and 4
   bytes key.

And, finally, a bunch of asorted small updates and cleanups:

X) Do not hold reference to netdev from ipt_CLUSTER, instead subscribe
   to device events and look up for index from the packet path, this
   is fixing an issue that is present since the very beginning, patch
   from Xin Long.

X) Use nf_register_net_hook() in ipt_CLUSTER, from Florian Westphal.

X) Use ebt_invalid_target() whenever possible in the ebtables tree,
   from Gao Feng.

X) Calm down compilation warning in nf_dup infrastructure, patch from
   stephen hemminger.

X) Statify functions in nftables rt expression, also from stephen.

X) Update Makefile to use canonical method to specify nf_tables-objs.
   From Jike Song.

X) Use nf_conntrack_helpers_register() in amanda and H323.

X) Space cleanup for ctnetlink, from linzhang.
====================

Signed-off-by: David S. Miller

net: bridge: constify attribute_group structures.

2017-06-29T19:48:52+00:00

attribute_groups are not supposed to change at runtime. All functions
working with attribute_groups provided by  work with const
attribute_group. So mark the non-const structs as const.

File size before:
   text	   data	    bss	    dec	    hex	filename
   2645	    896	      0	   3541	    dd5	net/bridge/br_sysfs_br.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
   2701	    832	      0	   3533	    dcd	net/bridge/br_sysfs_br.o

Signed-off-by: Arvind Yadav 
Signed-off-by: David S. Miller