linux/net/batman-adv
Sven Eckelmann 6c1f41afc1 batman-adv: Don't expect inter-netns unique iflink indices
The ifindex doesn't have to be unique for multiple network namespaces on
the same machine.

  $ ip netns add test1
  $ ip -net test1 link add dummy1 type dummy
  $ ip netns add test2
  $ ip -net test2 link add dummy2 type dummy

  $ ip -net test1 link show dev dummy1
  6: dummy1: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
      link/ether 96:81:55:1e:dd:85 brd ff:ff:ff:ff:ff:ff
  $ ip -net test2 link show dev dummy2
  6: dummy2: <BROADCAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
      link/ether 5a:3c:af:35:07:c3 brd ff:ff:ff:ff:ff:ff

But the batman-adv code to walk through the various layers of virtual
interfaces uses this assumption because dev_get_iflink handles it
internally and doesn't return the actual netns of the iflink. And
dev_get_iflink only documents the situation where ifindex == iflink for
physical devices.

But only checking for dev->netdev_ops->ndo_get_iflink is also not an option
because ipoib_get_iflink implements it even when it sometimes returns an
iflink != ifindex and sometimes iflink == ifindex. The caller must
therefore make sure itself to check both netns and iflink + ifindex for
equality. Only when they are equal, a "physical" interface was detected
which should stop the traversal. On the other hand, vxcan_get_iflink can
also return 0 in case there was currently no valid peer. In this case, it
is still necessary to stop.

Fixes: b7eddd0b39 ("batman-adv: prevent using any virtual device created on batman-adv as hard-interface")
Fixes: 5ed4a460a1 ("batman-adv: additional checks for virtual interfaces on top of WiFi")
Reported-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
2022-03-02 09:24:55 +01:00
..
bat_algo.c batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
bat_algo.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
bat_iv_ogm.c batman-adv: Drop NULL check before dropping references 2021-08-08 20:21:40 +02:00
bat_iv_ogm.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
bat_v_elp.c batman-adv: Drop NULL check before dropping references 2021-08-08 20:21:40 +02:00
bat_v_elp.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
bat_v_ogm.c batman-adv: Drop NULL check before dropping references 2021-08-08 20:21:40 +02:00
bat_v_ogm.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
bat_v.c batman-adv: Drop NULL check before dropping references 2021-08-08 20:21:40 +02:00
bat_v.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
bitarray.c batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
bitarray.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
bridge_loop_avoidance.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2021-10-28 10:43:58 -07:00
bridge_loop_avoidance.h batman-adv: Remove the repeated declaration 2021-05-30 13:38:27 +02:00
distributed-arp-table.c batman-adv: Drop NULL check before dropping references 2021-08-08 20:21:40 +02:00
distributed-arp-table.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
fragmentation.c batman-adv: Drop NULL check before dropping references 2021-08-08 20:21:40 +02:00
fragmentation.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
gateway_client.c batman-adv: Drop NULL check before dropping references 2021-08-08 20:21:40 +02:00
gateway_client.h batman-adv: Check ptr for NULL before reducing its refcnt 2021-08-08 20:21:40 +02:00
gateway_common.c batman-adv: Switch to kstrtox.h for kstrtou64 2021-08-08 20:05:46 +02:00
gateway_common.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
hard-interface.c batman-adv: Don't expect inter-netns unique iflink indices 2022-03-02 09:24:55 +01:00
hard-interface.h batman-adv: Check ptr for NULL before reducing its refcnt 2021-08-08 20:21:40 +02:00
hash.c batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
hash.h batman-adv: Fix spelling mistakes 2021-06-02 08:46:03 +02:00
Kconfig This feature/cleanup patchset is an updated version of the pull request 2021-02-08 11:32:40 -08:00
log.c isystem: ship and use stdarg.h 2021-08-19 09:02:55 +09:00
log.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
main.c net: batman-adv: fix error handling 2021-10-26 14:47:12 +01:00
main.h batman-adv: Start new development cycle 2021-11-15 12:01:07 +01:00
Makefile batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
multicast.c batman-adv: mcast: don't send link-local multicast to mcast routers 2022-01-02 09:31:17 +01:00
multicast.h batman-adv: mcast: don't send link-local multicast to mcast routers 2022-01-02 09:31:17 +01:00
netlink.c batman-adv: allow netlink usage in unprivileged containers 2021-11-15 12:01:14 +01:00
netlink.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
network-coding.c batman-adv: remove unneeded variable in batadv_nc_init 2021-12-10 08:52:52 +01:00
network-coding.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
originator.c batman-adv: Drop NULL check before dropping references 2021-08-08 20:21:40 +02:00
originator.h batman-adv: Check ptr for NULL before reducing its refcnt 2021-08-08 20:21:40 +02:00
routing.c batman-adv: prepare for const netdev->dev_addr 2021-10-20 14:22:25 +01:00
routing.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
send.c batman-adv: bcast: remove remaining skb-copy calls 2021-08-18 18:39:00 +02:00
send.h batman-adv: bcast: queue per interface, if needed 2021-05-17 12:00:44 +02:00
soft-interface.c batman-adv: mcast: don't send link-local multicast to mcast routers 2022-01-02 09:31:17 +01:00
soft-interface.h batman-adv: Check ptr for NULL before reducing its refcnt 2021-08-08 20:21:40 +02:00
tp_meter.c Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-11-10 16:15:54 -08:00
tp_meter.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
trace.c batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
trace.h batman-adv: Drop publication years from copyright info 2021-02-06 09:22:10 +01:00
translation-table.c net: batman-adv: fix error handling 2021-10-26 14:47:12 +01:00
translation-table.h batman-adv: Check ptr for NULL before reducing its refcnt 2021-08-08 20:21:40 +02:00
tvlv.c batman-adv: prepare for const netdev->dev_addr 2021-10-20 14:22:25 +01:00
tvlv.h batman-adv: prepare for const netdev->dev_addr 2021-10-20 14:22:25 +01:00
types.h batman-adv: Fix order of kernel doc in batadv_priv 2021-03-23 21:49:14 +01:00