ipv4: Add a socket release callback for datagram sockets
This implements a socket release callback function to check if the socket cached route got invalid during the time we owned the socket. The function is used from udp, raw and ping sockets. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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