[IPV6] HASHTABLES: Use appropriate seed for caluculating ehash index.

Tetsuo Handa <handat@pm.nttdata.co.jp> told me that connect(2) with TCPv6
socket almost always took a few minutes to return when we did not have any
ports available in the range of net.ipv4.ip_local_port_range.

The reason was that we used incorrect seed for calculating index of
hash when we check established sockets in __inet6_check_established().
Signed-off-by: NYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/inet6_hashtables.c

@@ -172,7 +172,7 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row,
 	const struct in6_addr *saddr = &np->daddr;
 	const int dif = sk->sk_bound_dev_if;
 	const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport);
-	const unsigned int hash = inet6_ehashfn(daddr, inet->num, saddr,
+	const unsigned int hash = inet6_ehashfn(daddr, lport, saddr,
 						inet->dport);
 	struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
 	struct sock *sk2;