• Toshiaki Makita's avatar
    bridge: Properly check if local fdb entry can be deleted when deleting vlan · 424bb9c9
    Toshiaki Makita authored
    Vlan codes unconditionally delete local fdb entries.
    We should consider the possibility that other ports have the same
    address and vlan.
    
    Example of problematic case:
      ip link set eth0 address 12:34:56:78:90:ab
      ip link set eth1 address aa:bb:cc:dd:ee:ff
      brctl addif br0 eth0
      brctl addif br0 eth1 # br0 will have mac address 12:34:56:78:90:ab
      bridge vlan add dev eth0 vid 10
      bridge vlan add dev eth1 vid 10
      bridge vlan add dev br0 vid 10 self
    We will have fdb entry such that f->dst == eth0, f->vlan_id == 10 and
    f->addr == 12:34:56:78:90:ab at this time.
    Next, delete eth0 vlan 10.
      bridge vlan del dev eth0 vid 10
    In this case, we still need the entry for br0, but it will be deleted.
    
    Note that br0 needs the entry even though its mac address is not set
    manually. To delete the entry with proper condition checking,
    fdb_delete_local() is suitable to use.
    Signed-off-by: default avatarToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
    Acked-by: default avatarVlad Yasevich <vyasevic@redhat.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    424bb9c9
br_private.h 21.7 KB