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ipv4: Add function to send route updates
Add fib_info_notify_update to walk the fib and send RTM_NEWROUTE notifications with NLM_F_REPLACE set for entries linked to a fib_info that have nh_updated flag set. This helper will be used by the nexthop code to notify userspace of routes that are impacted when a nexthop config is updated via replace. The new function and its helper are similar to how fib_flush and fib_table_flush work for address delete and link down events. This notification is needed for legacy apps that do not understand the new nexthop object. Apps that are nexthop aware can use the RTA_NH_ID attribute in the route notification to just ignore it. In the future this should be wrapped in a sysctl to allow OS'es that are fully updated to avoid the notificaton storm. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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