tcp: Link bhash2 to bhash.

bhash2 added a new member sk_bind2_node in struct sock to link
sockets to bhash2 in addition to bhash.

bhash is still needed to search conflicting sockets efficiently
from a port for the wildcard address.  However, bhash itself need
not have sockets.

If we link each bhash2 bucket to the corresponding bhash bucket,
we can iterate the same set of the sockets from bhash2 via bhash.

This patch links bhash2 to bhash only, and the actual use will be
in the later patches.  Finally, we will remove sk_bind2_node.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 12 insertions, 11 deletions

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index d48255875f60..8b29056f454d 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -572,7 +572,7 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
 
 	if (!tb2) {
 		tb2 = inet_bind2_bucket_create(hinfo->bind2_bucket_cachep,
-					       net, head2, port, l3mdev, sk);
+					       net, head2, tb, sk);
 		if (!tb2)
 			goto fail_unlock;
 		bhash2_created = true;
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 0a9919755709..7dc33dd1ba35 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -77,6 +77,7 @@ struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
 		tb->fastreuse = 0;
 		tb->fastreuseport = 0;
 		INIT_HLIST_HEAD(&tb->owners);
+		INIT_HLIST_HEAD(&tb->bhash2);
 		hlist_add_head(&tb->node, &head->chain);
 	}
 	return tb;
@@ -103,12 +104,12 @@ bool inet_bind_bucket_match(const struct inet_bind_bucket *tb, const struct net
 static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb2,
 				   struct net *net,
 				   struct inet_bind_hashbucket *head,
-				   unsigned short port, int l3mdev,
+				   struct inet_bind_bucket *tb,
 				   const struct sock *sk)
 {
 	write_pnet(&tb2->ib_net, net);
-	tb2->l3mdev = l3mdev;
-	tb2->port = port;
+	tb2->l3mdev = tb->l3mdev;
+	tb2->port = tb->port;
 #if IS_ENABLED(CONFIG_IPV6)
 	BUILD_BUG_ON(USHRT_MAX < (IPV6_ADDR_ANY | IPV6_ADDR_MAPPED));
 	if (sk->sk_family == AF_INET6) {
@@ -124,19 +125,19 @@ static void inet_bind2_bucket_init(struct inet_bind2_bucket *tb2,
 	INIT_HLIST_HEAD(&tb2->owners);
 	INIT_HLIST_HEAD(&tb2->deathrow);
 	hlist_add_head(&tb2->node, &head->chain);
+	hlist_add_head(&tb2->bhash_node, &tb->bhash2);
 }
 
 struct inet_bind2_bucket *inet_bind2_bucket_create(struct kmem_cache *cachep,
 						   struct net *net,
 						   struct inet_bind_hashbucket *head,
-						   unsigned short port,
-						   int l3mdev,
+						   struct inet_bind_bucket *tb,
 						   const struct sock *sk)
 {
 	struct inet_bind2_bucket *tb2 = kmem_cache_alloc(cachep, GFP_ATOMIC);
 
 	if (tb2)
-		inet_bind2_bucket_init(tb2, net, head, port, l3mdev, sk);
+		inet_bind2_bucket_init(tb2, net, head, tb, sk);
 
 	return tb2;
 }
@@ -146,6 +147,7 @@ void inet_bind2_bucket_destroy(struct kmem_cache *cachep, struct inet_bind2_buck
 {
 	if (hlist_empty(&tb->owners) && hlist_empty(&tb->deathrow)) {
 		__hlist_del(&tb->node);
+		__hlist_del(&tb->bhash_node);
 		kmem_cache_free(cachep, tb);
 	}
 }
@@ -273,8 +275,7 @@ bhash2_find:
 		tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, child);
 		if (!tb2) {
 			tb2 = inet_bind2_bucket_create(table->bind2_bucket_cachep,
-						       net, head2, port,
-						       l3mdev, child);
+						       net, head2, tb, child);
 			if (!tb2)
 				goto error;
 		}
@@ -954,7 +955,7 @@ static int __inet_bhash2_update_saddr(struct sock *sk, void *saddr, int family,
 	tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
 	if (!tb2) {
 		tb2 = new_tb2;
-		inet_bind2_bucket_init(tb2, net, head2, port, l3mdev, sk);
+		inet_bind2_bucket_init(tb2, net, head2, inet_csk(sk)->icsk_bind_hash, sk);
 	}
 	sk_add_bind2_node(sk, &tb2->owners);
 	inet_csk(sk)->icsk_bind2_hash = tb2;
@@ -1101,7 +1102,7 @@ ok:
 	tb2 = inet_bind2_bucket_find(head2, net, port, l3mdev, sk);
 	if (!tb2) {
 		tb2 = inet_bind2_bucket_create(hinfo->bind2_bucket_cachep, net,
-					       head2, port, l3mdev, sk);
+					       head2, tb, sk);
 		if (!tb2)
 			goto error;
 	}