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tcp: Use bhash2 for v4-mapped-v6 non-wildcard address.

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While checking port availability in bind() or listen(), we used only
bhash for all v4-mapped-v6 addresses.  But there is no good reason not
to use bhash2 for v4-mapped-v6 non-wildcard addresses.

Let's do it by returning true in inet_use_bhash2_on_bind().  Then, we
also need to add a test in inet_bind2_bucket_match_addr_any() so that
::ffff:X.X.X.X will match with 0.0.0.0.

Note that sk->sk_rcv_saddr is initialised for v4-mapped-v6 sk in
__inet6_bind().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kuniyuki Iwashima 2023-12-19 09:18:22 +09:00 • committed by David S. Miller
parent 67f440c05d
commit 5e07e67241
2 changed files with 7 additions and 3 deletions
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7
net/ipv4/inet_connection_sock.c
View file

@ -159,8 +159,11 @@ static bool inet_use_bhash2_on_bind(const struct sock *sk)
if (sk->sk_family == AF_INET6) {
int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
return addr_type != IPV6_ADDR_ANY &&
addr_type != IPV6_ADDR_MAPPED;
if (addr_type == IPV6_ADDR_ANY)
return false;
if (addr_type != IPV6_ADDR_MAPPED)
return true;
}
#endif
return sk->sk_rcv_saddr != htonl(INADDR_ANY);

3
net/ipv4/inet_hashtables.c
View file

@ -841,7 +841,8 @@ bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const
return ipv6_addr_any(&tb->v6_rcv_saddr) ||
ipv6_addr_v4mapped_any(&tb->v6_rcv_saddr);
return false;
return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) &&
tb->rcv_saddr == 0;
}
if (sk->sk_family == AF_INET6)