tcp: Rearrange tests in inet_bind2_bucket_(addr_match|match_addr_any)().

The protocol family tests in inet_bind2_bucket_addr_match() and
inet_bind2_bucket_match_addr_any() are ordered as follows.

  if (sk->sk_family != tb2->family)
  else if (sk->sk_family == AF_INET6)
  else

This patch rearranges them so that AF_INET6 socket is handled first
to make the following patch tidy, where tb2->family will be removed.

  if (sk->sk_family == AF_INET6)
  else if (tb2->family == AF_INET6)
  else
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/inet_hashtables.c

@@ -149,18 +149,17 @@ static bool inet_bind2_bucket_addr_match(const struct inet_bind2_bucket *tb2,
 					 const struct sock *sk)
 {
 #if IS_ENABLED(CONFIG_IPV6)
-	if (sk->sk_family != tb2->family) {
-		if (sk->sk_family == AF_INET)
-			return ipv6_addr_v4mapped(&tb2->v6_rcv_saddr) &&
-				tb2->v6_rcv_saddr.s6_addr32[3] == sk->sk_rcv_saddr;
+	if (sk->sk_family == AF_INET6) {
+		if (tb2->family == AF_INET6)
+			return ipv6_addr_equal(&tb2->v6_rcv_saddr, &sk->sk_v6_rcv_saddr);
 
 		return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) &&
 			sk->sk_v6_rcv_saddr.s6_addr32[3] == tb2->rcv_saddr;
 	}
 
-	if (sk->sk_family == AF_INET6)
-		return ipv6_addr_equal(&tb2->v6_rcv_saddr,
-				       &sk->sk_v6_rcv_saddr);
+	if (tb2->family == AF_INET6)
+		return ipv6_addr_v4mapped(&tb2->v6_rcv_saddr) &&
+			tb2->v6_rcv_saddr.s6_addr32[3] == sk->sk_rcv_saddr;
 #endif
 	return tb2->rcv_saddr == sk->sk_rcv_saddr;
 }
@@ -836,17 +835,17 @@ bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const
 		return false;
 
 #if IS_ENABLED(CONFIG_IPV6)
-	if (sk->sk_family != tb->family) {
-		if (sk->sk_family == AF_INET)
-			return ipv6_addr_any(&tb->v6_rcv_saddr) ||
-				ipv6_addr_v4mapped_any(&tb->v6_rcv_saddr);
+	if (sk->sk_family == AF_INET6) {
+		if (tb->family == AF_INET6)
+			return ipv6_addr_any(&tb->v6_rcv_saddr);
 
 		return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) &&
 			tb->rcv_saddr == 0;
 	}
 
-	if (sk->sk_family == AF_INET6)
-		return ipv6_addr_any(&tb->v6_rcv_saddr);
+	if (tb->family == AF_INET6)
+		return ipv6_addr_any(&tb->v6_rcv_saddr) ||
+			ipv6_addr_v4mapped_any(&tb->v6_rcv_saddr);
 #endif
 	return tb->rcv_saddr == 0;
 }