tcp: Factorise sk_family-independent comparison in inet_bind2_bucket_…

…match(_addr_any).

[ Upstream commit c6d2770 ]

This is a prep patch to make the following patches cleaner that touch
inet_bind2_bucket_match() and inet_bind2_bucket_match_addr_any().

Both functions have duplicated comparison for netns, port, and l3mdev.
Let's factorise them.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: aa99e5f ("tcp: Fix bind() regression for v4-mapped-v6 wildcard address.")
Signed-off-by: Sasha Levin <sashal@kernel.org>

net/ipv4/inet_hashtables.c

@@ -795,41 +795,39 @@ static bool inet_bind2_bucket_match(const struct inet_bind2_bucket *tb,
 				    const struct net *net, unsigned short port,
 				    int l3mdev, const struct sock *sk)
 {
+	if (!net_eq(ib2_net(tb), net) || tb->port != port ||
+	    tb->l3mdev != l3mdev)
+		return false;
+
 #if IS_ENABLED(CONFIG_IPV6)
 	if (sk->sk_family != tb->family)
 		return false;
 
 	if (sk->sk_family == AF_INET6)
-		return net_eq(ib2_net(tb), net) && tb->port == port &&
-			tb->l3mdev == l3mdev &&
-			ipv6_addr_equal(&tb->v6_rcv_saddr, &sk->sk_v6_rcv_saddr);
-	else
+		return ipv6_addr_equal(&tb->v6_rcv_saddr, &sk->sk_v6_rcv_saddr);
 #endif
-		return net_eq(ib2_net(tb), net) && tb->port == port &&
-			tb->l3mdev == l3mdev && tb->rcv_saddr == sk->sk_rcv_saddr;
+	return tb->rcv_saddr == sk->sk_rcv_saddr;
 }
 
 bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const struct net *net,
 				      unsigned short port, int l3mdev, const struct sock *sk)
 {
+	if (!net_eq(ib2_net(tb), net) || tb->port != port ||
+	    tb->l3mdev != l3mdev)
+		return false;
+
 #if IS_ENABLED(CONFIG_IPV6)
 	if (sk->sk_family != tb->family) {
 		if (sk->sk_family == AF_INET)
-			return net_eq(ib2_net(tb), net) && tb->port == port &&
-				tb->l3mdev == l3mdev &&
-				ipv6_addr_any(&tb->v6_rcv_saddr);
+			return ipv6_addr_any(&tb->v6_rcv_saddr);
 
 		return false;
 	}
 
 	if (sk->sk_family == AF_INET6)
-		return net_eq(ib2_net(tb), net) && tb->port == port &&
-			tb->l3mdev == l3mdev &&
-			ipv6_addr_any(&tb->v6_rcv_saddr);
-	else
+		return ipv6_addr_any(&tb->v6_rcv_saddr);
 #endif
-		return net_eq(ib2_net(tb), net) && tb->port == port &&
-			tb->l3mdev == l3mdev && tb->rcv_saddr == 0;
+	return tb->rcv_saddr == 0;
 }
 
 /* The socket's bhash2 hashbucket spinlock must be held when this is called */