netdev - [PATCH v2 net-next 04/12] tcp: Save address type in inet_bind2

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Date: Wed, 13 Dec 2023 17:20:21 +0900
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, David Ahern <dsahern@...nel.org>
CC: Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 04/12] tcp: Save address type in inet_bind2_bucket.

inet_bind2_bucket_addr_match() and inet_bind2_bucket_match_addr_any()
are called for each bhash2 bucket to check conflicts.  Thus, we call
ipv6_addr_any() and ipv6_addr_v4mapped() over and over during bind().

Let's avoid calling them by saving the address type in inet_bind2_bucket.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 include/net/inet_hashtables.h |  1 +
 net/ipv4/inet_hashtables.c    | 29 +++++++++++++----------------
 2 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 171cc235d045..260e673ede22 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -96,6 +96,7 @@ struct inet_bind2_bucket {
 	int			l3mdev;
 	unsigned short		port;
 #if IS_ENABLED(CONFIG_IPV6)
+	unsigned short		addr_type;
 	struct in6_addr		v6_rcv_saddr;
 #define rcv_saddr		v6_rcv_saddr.s6_addr32[3]
 #else
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 80d7c8f92d77..465469de19bf 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -110,10 +110,14 @@ static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb,
 	tb->l3mdev    = l3mdev;
 	tb->port      = port;
 #if IS_ENABLED(CONFIG_IPV6)
-	if (sk->sk_family == AF_INET6)
+	BUILD_BUG_ON(USHRT_MAX < (IPV6_ADDR_ANY | IPV6_ADDR_MAPPED));
+	if (sk->sk_family == AF_INET6) {
+		tb->addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
 		tb->v6_rcv_saddr = sk->sk_v6_rcv_saddr;
-	else
+	} else {
+		tb->addr_type = IPV6_ADDR_MAPPED;
 		ipv6_addr_set_v4mapped(sk->sk_rcv_saddr, &tb->v6_rcv_saddr);
+	}
 #else
 	tb->rcv_saddr = sk->sk_rcv_saddr;
 #endif
@@ -153,7 +157,7 @@ static bool inet_bind2_bucket_addr_match(const struct inet_bind2_bucket *tb2,
 	if (sk->sk_family == AF_INET6)
 		return ipv6_addr_equal(&tb2->v6_rcv_saddr, &sk->sk_v6_rcv_saddr);
 
-	if (!ipv6_addr_v4mapped(&tb2->v6_rcv_saddr))
+	if (tb2->addr_type != IPV6_ADDR_MAPPED)
 		return false;
 #endif
 	return tb2->rcv_saddr == sk->sk_rcv_saddr;
@@ -830,21 +834,14 @@ 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 == AF_INET6) {
-		if (ipv6_addr_any(&tb->v6_rcv_saddr))
-			return true;
-
-		if (!ipv6_addr_v4mapped(&tb->v6_rcv_saddr))
-			return false;
-
-		return ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr) &&
-			tb->rcv_saddr == 0;
-	}
-
-	if (ipv6_addr_any(&tb->v6_rcv_saddr))
+	if (tb->addr_type == IPV6_ADDR_ANY)
 		return true;
 
-	if (!ipv6_addr_v4mapped(&tb->v6_rcv_saddr))
+	if (tb->addr_type != IPV6_ADDR_MAPPED)
+		return false;
+
+	if (sk->sk_family == AF_INET6 &&
+	    !ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
 		return false;
 #endif
 	return tb->rcv_saddr == 0;
-- 
2.30.2