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tcp_twsk_unique() has a hard coded assumption about ipv4 loopback being 127/8 Lets instead use the standard ipv4_is_loopback() method, in a new ipv6_addr_v4mapped_loopback() helper. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>