[PATCH RFC net-next v4 4/8] vsock: make vsock bind reusable

From: Bobby Eshleman <bobby.eshleman@bytedance.com>
To: Stefan Hajnoczi <stefanha@redhat.com>,
	Stefano Garzarella <sgarzare@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
	Bryan Tan <bryantan@vmware.com>, Vishnu Dasa <vdasa@vmware.com>,
	VMware PV-Drivers Reviewers <pv-drivers@vmware.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>,
	Simon Horman <simon.horman@corigine.com>,
	Krasnov Arseniy <oxffffaa@gmail.com>,
	kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-hyperv@vger.kernel.org, bpf@vger.kernel.org,
	Bobby Eshleman <bobby.eshleman@bytedance.com>
Subject: [PATCH RFC net-next v4 4/8] vsock: make vsock bind reusable
Date: Sat, 10 Jun 2023 00:58:31 +0000	[thread overview]
Message-ID: <20230413-b4-vsock-dgram-v4-4-0cebbb2ae899@bytedance.com> (raw)
In-Reply-To: <20230413-b4-vsock-dgram-v4-0-0cebbb2ae899@bytedance.com>

This commit makes the bind table management functions in vsock usable
for different bind tables. For use by datagrams in a future patch.

Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.com>
---
 net/vmw_vsock/af_vsock.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index ef86765f3765..7a3ca4270446 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -230,11 +230,12 @@ static void __vsock_remove_connected(struct vsock_sock *vsk)
 	sock_put(&vsk->sk);
 }
 
-static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
+struct sock *vsock_find_bound_socket_common(struct sockaddr_vm *addr,
+					    struct list_head *bind_table)
 {
 	struct vsock_sock *vsk;
 
-	list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) {
+	list_for_each_entry(vsk, bind_table, bound_table) {
 		if (vsock_addr_equals_addr(addr, &vsk->local_addr))
 			return sk_vsock(vsk);
 
@@ -247,6 +248,11 @@ static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
 	return NULL;
 }
 
+static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
+{
+	return vsock_find_bound_socket_common(addr, vsock_bound_sockets(addr));
+}
+
 static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
 						  struct sockaddr_vm *dst)
 {
@@ -646,12 +652,17 @@ static void vsock_pending_work(struct work_struct *work)
 
 /**** SOCKET OPERATIONS ****/
 
-static int __vsock_bind_connectible(struct vsock_sock *vsk,
-				    struct sockaddr_vm *addr)
+static int vsock_bind_common(struct vsock_sock *vsk,
+			     struct sockaddr_vm *addr,
+			     struct list_head *bind_table,
+			     size_t table_size)
 {
 	static u32 port;
 	struct sockaddr_vm new_addr;
 
+	if (table_size < VSOCK_HASH_SIZE)
+		return -1;
+
 	if (!port)
 		port = get_random_u32_above(LAST_RESERVED_PORT);
 
@@ -667,7 +678,8 @@ static int __vsock_bind_connectible(struct vsock_sock *vsk,
 
 			new_addr.svm_port = port++;
 
-			if (!__vsock_find_bound_socket(&new_addr)) {
+			if (!vsock_find_bound_socket_common(&new_addr,
+							    &bind_table[VSOCK_HASH(addr)])) {
 				found = true;
 				break;
 			}
@@ -684,7 +696,8 @@ static int __vsock_bind_connectible(struct vsock_sock *vsk,
 			return -EACCES;
 		}
 
-		if (__vsock_find_bound_socket(&new_addr))
+		if (vsock_find_bound_socket_common(&new_addr,
+						   &bind_table[VSOCK_HASH(addr)]))
 			return -EADDRINUSE;
 	}
 
@@ -696,11 +709,17 @@ static int __vsock_bind_connectible(struct vsock_sock *vsk,
 	 * by AF_UNIX.
 	 */
 	__vsock_remove_bound(vsk);
-	__vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk);
+	__vsock_insert_bound(&bind_table[VSOCK_HASH(&vsk->local_addr)], vsk);
 
 	return 0;
 }
 
+static int __vsock_bind_connectible(struct vsock_sock *vsk,
+				    struct sockaddr_vm *addr)
+{
+	return vsock_bind_common(vsk, addr, vsock_bind_table, VSOCK_HASH_SIZE + 1);
+}
+
 static int __vsock_bind_dgram(struct vsock_sock *vsk,
 			      struct sockaddr_vm *addr)
 {

-- 
2.30.2

