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tcp: add ipv6_addr_v4mapped_loopback() helper

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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>
This commit is contained in:
Eric Dumazet
2019-10-01 10:49:06 -07:00
committed by David S. Miller
parent 5be5515a8e
commit be2644aac3
2 changed files with 7 additions and 4 deletions
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5
include/net/ipv6.h
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@@ -696,6 +696,11 @@ static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
cpu_to_be32(0x0000ffff))) == 0UL;
}
static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
{
return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
}
static inline u32 ipv6_portaddr_hash(const struct net *net,
const struct in6_addr *addr6,
unsigned int port)