• Simon Wunderlich's avatar
    batman-adv: add basic bridge loop avoidance code · 23721387
    Simon Wunderlich authored
    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: default avatarSimon Wunderlich <siwu@hrz.tu-chemnitz.de>
    Signed-off-by: default avatarAntonio Quartulli <ordex@autistici.org>
    23721387
Kconfig 765 Bytes