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Mike Rapoport 5933a7bbb5 net: vxlan: fix crash when interface is created with no group 
If the vxlan interface is created without explicit group definition,
there are corner cases which may cause kernel panic.

For instance, in the following scenario:

node A:
$ ip link add dev vxlan42  address 2c:c2:60:00:10:20 type vxlan id 42
$ ip addr add dev vxlan42 10.0.0.1/24
$ ip link set up dev vxlan42
$ arp -i vxlan42 -s 10.0.0.2 2c:c2:60:00:01:02
$ bridge fdb add dev vxlan42 to 2c:c2:60:00:01:02 dst <IPv4 address>
$ ping 10.0.0.2

node B:
$ ip link add dev vxlan42 address 2c:c2:60:00:01:02 type vxlan id 42
$ ip addr add dev vxlan42 10.0.0.2/24
$ ip link set up dev vxlan42
$ arp -i vxlan42 -s 10.0.0.1 2c:c2:60:00:10:20

node B crashes:

 vxlan42: 2c:c2:60:00:10:20 migrated from 4011:eca4:c0a8:6466:c0a8:6415:8e09:2118 to (invalid address)
 vxlan42: 2c:c2:60:00:10:20 migrated from 4011:eca4:c0a8:6466:c0a8:6415:8e09:2118 to (invalid address)
 BUG: unable to handle kernel NULL pointer dereference at 0000000000000046
 IP: [<ffffffff8143c459>] ip6_route_output+0x58/0x82
 PGD 7bd89067 PUD 7bd4e067 PMD 0
 Oops: 0000 [#1] SMP
 Modules linked in:
 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.14.0-rc8-hvx-xen-00019-g97a5221-dirty #154
 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
 task: ffff88007c774f50 ti: ffff88007c79c000 task.ti: ffff88007c79c000
 RIP: 0010:[<ffffffff8143c459>]  [<ffffffff8143c459>] ip6_route_output+0x58/0x82
 RSP: 0018:ffff88007fd03668  EFLAGS: 00010282
 RAX: 0000000000000000 RBX: ffffffff8186a000 RCX: 0000000000000040
 RDX: 0000000000000000 RSI: ffff88007b0e4a80 RDI: ffff88007fd03754
 RBP: ffff88007fd03688 R08: ffff88007b0e4a80 R09: 0000000000000000
 R10: 0200000a0100000a R11: 0001002200000000 R12: ffff88007fd03740
 R13: ffff88007b0e4a80 R14: ffff88007b0e4a80 R15: ffff88007bba0c50
 FS:  0000000000000000(0000) GS:ffff88007fd00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 CR2: 0000000000000046 CR3: 000000007bb60000 CR4: 00000000000006e0
 Stack:
  0000000000000000 ffff88007fd037a0 ffffffff8186a000 ffff88007fd03740
  ffff88007fd036c8 ffffffff814320bb 0000000000006e49 ffff88007b8b7360
  ffff88007bdbf200 ffff88007bcbc000 ffff88007b8b7000 ffff88007b8b7360
 Call Trace:
  <IRQ>
  [<ffffffff814320bb>] ip6_dst_lookup_tail+0x2d/0xa4
  [<ffffffff814322a5>] ip6_dst_lookup+0x10/0x12
  [<ffffffff81323b4e>] vxlan_xmit_one+0x32a/0x68c
  [<ffffffff814a325a>] ? _raw_spin_unlock_irqrestore+0x12/0x14
  [<ffffffff8104c551>] ? lock_timer_base.isra.23+0x26/0x4b
  [<ffffffff8132451a>] vxlan_xmit+0x66a/0x6a8
  [<ffffffff8141a365>] ? ipt_do_table+0x35f/0x37e
  [<ffffffff81204ba2>] ? selinux_ip_postroute+0x41/0x26e
  [<ffffffff8139d0c1>] dev_hard_start_xmit+0x2ce/0x3ce
  [<ffffffff8139d491>] __dev_queue_xmit+0x2d0/0x392
  [<ffffffff813b380f>] ? eth_header+0x28/0xb5
  [<ffffffff8139d569>] dev_queue_xmit+0xb/0xd
  [<ffffffff813a5aa6>] neigh_resolve_output+0x134/0x152
  [<ffffffff813db741>] ip_finish_output2+0x236/0x299
  [<ffffffff813dc074>] ip_finish_output+0x98/0x9d
  [<ffffffff813dc749>] ip_output+0x62/0x67
  [<ffffffff813da9f2>] dst_output+0xf/0x11
  [<ffffffff813dc11c>] ip_local_out+0x1b/0x1f
  [<ffffffff813dcf1b>] ip_send_skb+0x11/0x37
  [<ffffffff813dcf70>] ip_push_pending_frames+0x2f/0x33
  [<ffffffff813ff732>] icmp_push_reply+0x106/0x115
  [<ffffffff813ff9e4>] icmp_reply+0x142/0x164
  [<ffffffff813ffb3b>] icmp_echo.part.16+0x46/0x48
  [<ffffffff813c1d30>] ? nf_iterate+0x43/0x80
  [<ffffffff813d8037>] ? xfrm4_policy_check.constprop.11+0x52/0x52
  [<ffffffff813ffb62>] icmp_echo+0x25/0x27
  [<ffffffff814005f7>] icmp_rcv+0x1d2/0x20a
  [<ffffffff813d8037>] ? xfrm4_policy_check.constprop.11+0x52/0x52
  [<ffffffff813d810d>] ip_local_deliver_finish+0xd6/0x14f
  [<ffffffff813d8037>] ? xfrm4_policy_check.constprop.11+0x52/0x52
  [<ffffffff813d7fde>] NF_HOOK.constprop.10+0x4c/0x53
  [<ffffffff813d82bf>] ip_local_deliver+0x4a/0x4f
  [<ffffffff813d7f7b>] ip_rcv_finish+0x253/0x26a
  [<ffffffff813d7d28>] ? inet_add_protocol+0x3e/0x3e
  [<ffffffff813d7fde>] NF_HOOK.constprop.10+0x4c/0x53
  [<ffffffff813d856a>] ip_rcv+0x2a6/0x2ec
  [<ffffffff8139a9a0>] __netif_receive_skb_core+0x43e/0x478
  [<ffffffff812a346f>] ? virtqueue_poll+0x16/0x27
  [<ffffffff8139aa2f>] __netif_receive_skb+0x55/0x5a
  [<ffffffff8139aaaa>] process_backlog+0x76/0x12f
  [<ffffffff8139add8>] net_rx_action+0xa2/0x1ab
  [<ffffffff81047847>] __do_softirq+0xca/0x1d1
  [<ffffffff81047ace>] irq_exit+0x3e/0x85
  [<ffffffff8100b98b>] do_IRQ+0xa9/0xc4
  [<ffffffff814a37ad>] common_interrupt+0x6d/0x6d
  <EOI>
  [<ffffffff810378db>] ? native_safe_halt+0x6/0x8
  [<ffffffff810110c7>] default_idle+0x9/0xd
  [<ffffffff81011694>] arch_cpu_idle+0x13/0x1c
  [<ffffffff8107480d>] cpu_startup_entry+0xbc/0x137
  [<ffffffff8102e741>] start_secondary+0x1a0/0x1a5
 Code: 24 14 e8 f1 e5 01 00 31 d2 a8 32 0f 95 c2 49 8b 44 24 2c 49 0b 44 24 24 74 05 83 ca 04 eb 1c 4d 85 ed 74 17 49 8b 85 a8 02 00 00 <66> 8b 40 46 66 c1 e8 07 83 e0 07 c1 e0 03 09 c2 4c 89 e6 48 89
 RIP  [<ffffffff8143c459>] ip6_route_output+0x58/0x82
  RSP <ffff88007fd03668>
 CR2: 0000000000000046
 ---[ end trace 4612329caab37efd ]---

When vxlan interface is created without explicit group definition, the
default_dst protocol family is initialiazed to AF_UNSPEC and the driver
assumes IPv4 configuration. On the other side, the default_dst protocol
family is used to differentiate between IPv4 and IPv6 cases and, since,
AF_UNSPEC != AF_INET, the processing takes the IPv6 path.

Making the IPv4 assumption explicit by settting default_dst protocol
family to AF_INET4 and preventing mixing of IPv4 and IPv6 addresses in
snooped fdb entries fixes the corner case crashes.

Signed-off-by: Mike Rapoport <mike.rapoport@ravellosystems.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2014-04-03 11:16:47 -04:00
..
appletalk
…
arcnet drivers/net: delete non-required instances of include <linux/init.h> 2014-01-16 11:53:26 -08:00
bonding netpoll: Remove gfp parameter from __netpoll_setup 2014-03-29 17:58:37 -04:00
caif caif: delete unnecessary field initialization 2014-02-17 00:29:23 -05:00
can linux-can-fixes-for-3.15-20140401 2014-04-01 17:49:50 -04:00
cris
…
dsa
…
ethernet Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-04-02 16:23:38 -07:00
fddi drivers/net: delete non-required instances of include <linux/init.h> 2014-01-16 11:53:26 -08:00
hamradio yam: replace del_timer by del_timer_sync 2014-03-27 15:28:06 -04:00
hippi drivers/net: delete non-required instances of include <linux/init.h> 2014-01-16 11:53:26 -08:00
hyperv Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-03-14 22:31:55 -04:00
ieee802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-03-31 16:56:43 -04:00
irda irtty-sir.c: Do not set_termios() on irtty_close() 2014-02-17 16:27:51 -05:00
phy net: ptp: move PTP classifier in its own file 2014-04-01 16:43:18 -04:00
plip net: plip: slight optimization of addr compare 2013-12-31 16:48:33 -05:00
ppp net: ppp: use sk_unattached_filter api 2014-03-31 00:45:09 -04:00
slip
…
team netpoll: Remove gfp parameter from __netpoll_setup 2014-03-29 17:58:37 -04:00
usb qmi_wwan/cdc_ether: move Novatel E371 (1410:9011) to qmi_wwan 2014-03-31 16:06:11 -04:00
vmxnet3 vmxnet3: Call dev_kfree_skb_any instead of dev_kfree_skb. 2014-03-24 21:19:23 -07:00
wan wan: dlci: Remove unused netdev_priv pointer 2014-02-09 18:40:56 -08:00
wimax wimax/i2400m: remove open-coded skb_cow_head. 2014-03-29 17:49:47 -04:00
wireless Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2014-03-31 15:08:51 -07:00
xen-netback xen-netback: disable rogue vif in kthread context 2014-04-01 16:25:51 -04:00
Kconfig netpoll: Remove dead packet receive code (CONFIG_NETPOLL_TRAP) 2014-03-17 15:48:12 -04:00
LICENSE.SRC
…
Makefile
…
Space.c drivers: net: Include new header file in sbni.c 2013-12-19 18:51:20 -05:00
dummy.c net: Replace u64_stats_fetch_begin_bh to u64_stats_fetch_begin_irq 2014-03-14 22:41:36 -04:00
eql.c eql: use __dev_get_by_name instead of dev_get_by_name to find interface 2014-01-14 18:50:46 -08:00
ifb.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-03-29 18:48:54 -04:00
loopback.c net: Replace u64_stats_fetch_begin_bh to u64_stats_fetch_begin_irq 2014-03-14 22:41:36 -04:00
macvlan.c net: Replace u64_stats_fetch_begin_bh to u64_stats_fetch_begin_irq 2014-03-14 22:41:36 -04:00
macvtap.c drivers/net: delete non-required instances of include <linux/init.h> 2014-01-16 11:53:26 -08:00
mdio.c mdio: unused ethtool functions 2013-12-26 13:29:35 -05:00
mii.c
…
netconsole.c
…
nlmon.c net: nlmon: flag nlmon devs with LLTX/SG 2014-03-28 16:49:47 -04:00
ntb_netdev.c
…
rionet.c
…
sb1000.c
…
sungem_phy.c
…
tun.c drivers/net: Use RCU_INIT_POINTER(x, NULL) in tun.c 2014-03-27 00:18:09 -04:00
veth.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-03-29 18:48:54 -04:00
virtio_net.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-04-02 20:53:45 -07:00
vxlan.c net: vxlan: fix crash when interface is created with no group 2014-04-03 11:16:47 -04:00
xen-netfront.c xen-netfront: Call dev_kfree_skb_any instead of dev_kfree_skb. 2014-03-24 21:19:23 -07:00