]> git.baikalelectronics.ru Git - kernel.git/commit
batman-adv: add basic bridge loop avoidance code
authorSimon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>
Sun, 22 Jan 2012 19:00:19 +0000 (20:00 +0100)
committerAntonio Quartulli <ordex@autistici.org>
Wed, 11 Apr 2012 12:28:58 +0000 (14:28 +0200)
commit4056ef02f5d054a848bf9ac46a293b9568478de3
treecf386c6f169a1b2b6e8c8ef77be5226e10046689
parentf6ff0beaae9365289e5327e13f0ab48a72ecf236
batman-adv: add basic bridge loop avoidance code

This second version of the bridge loop avoidance for batman-adv
avoids loops between the mesh and a backbone (usually a LAN).

By connecting multiple batman-adv mesh nodes to the same ethernet
segment a loop can be created when the soft-interface is bridged
into that ethernet segment. A simple visualization of the loop
involving the most common case - a LAN as ethernet segment:

node1  <-- LAN  -->  node2
  |                   |
wifi   <-- mesh -->  wifi

Packets from the LAN (e.g. ARP broadcasts) will circle forever from
node1 or node2 over the mesh back into the LAN.

With this patch, batman recognizes backbone gateways, nodes which are
part of the mesh and backbone/LAN at the same time. Each backbone
gateway "claims" clients from within the mesh to handle them
exclusively. By restricting that only responsible backbone gateways
may handle their claimed clients traffic, loops are effectively
avoided.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
14 files changed:
Documentation/networking/batman-adv.txt
net/batman-adv/Kconfig
net/batman-adv/Makefile
net/batman-adv/bat_sysfs.c
net/batman-adv/bridge_loop_avoidance.c [new file with mode: 0644]
net/batman-adv/bridge_loop_avoidance.h [new file with mode: 0644]
net/batman-adv/hard-interface.c
net/batman-adv/main.c
net/batman-adv/main.h
net/batman-adv/originator.c
net/batman-adv/packet.h
net/batman-adv/routing.c
net/batman-adv/soft-interface.c
net/batman-adv/types.h