[IPV4]: Add fib rule netlink notifications
To really make sense of route notifications in the presence of multiple tables, userspace also needs to be notified about routing rule updates. Notifications are sent to the so far unused RTNLGRP_NOP1 (now RTNLGRP_RULE) group. Signed-off-by: NPatrick McHardy <kaber@trash.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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