• Ido Schimmel's avatar
    net: core: Make the FIB notification chain generic · 04b1d4e5
    Ido Schimmel authored
    The FIB notification chain is currently soley used by IPv4 code.
    However, we're going to introduce IPv6 FIB offload support, which
    requires these notification as well.
    
    As explained in commit c3852ef7 ("ipv4: fib: Replay events when
    registering FIB notifier"), upon registration to the chain, the callee
    receives a full dump of the FIB tables and rules by traversing all the
    net namespaces. The integrity of the dump is ensured by a per-namespace
    sequence counter that is incremented whenever a change to the tables or
    rules occurs.
    
    In order to allow more address families to use the chain, each family is
    expected to register its fib_notifier_ops in its pernet init. These
    operations allow the common code to read the family's sequence counter
    as well as dump its tables and rules in the given net namespace.
    
    Additionally, a 'family' parameter is added to sent notifications, so
    that listeners could distinguish between the different families.
    
    Implement the common code that allows listeners to register to the chain
    and for address families to register their fib_notifier_ops. Subsequent
    patches will implement these operations in IPv6.
    
    In the future, ipmr and ip6mr will be extended to provide these
    notifications as well.
    Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
    Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    04b1d4e5
fib_frontend.c 31.8 KB