2 * VMware vSockets Driver
4 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation version 2 and no later version.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 /* Implementation notes:
18 * - There are two kinds of sockets: those created by user action (such as
19 * calling socket(2)) and those created by incoming connection request packets.
21 * - There are two "global" tables, one for bound sockets (sockets that have
22 * specified an address that they are responsible for) and one for connected
23 * sockets (sockets that have established a connection with another socket).
24 * These tables are "global" in that all sockets on the system are placed
25 * within them. - Note, though, that the bound table contains an extra entry
26 * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in
27 * that list. The bound table is used solely for lookup of sockets when packets
28 * are received and that's not necessary for SOCK_DGRAM sockets since we create
29 * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM
30 * sockets out of the bound hash buckets will reduce the chance of collisions
31 * when looking for SOCK_STREAM sockets and prevents us from having to check the
32 * socket type in the hash table lookups.
34 * - Sockets created by user action will either be "client" sockets that
35 * initiate a connection or "server" sockets that listen for connections; we do
36 * not support simultaneous connects (two "client" sockets connecting).
38 * - "Server" sockets are referred to as listener sockets throughout this
39 * implementation because they are in the VSOCK_SS_LISTEN state. When a
40 * connection request is received (the second kind of socket mentioned above),
41 * we create a new socket and refer to it as a pending socket. These pending
42 * sockets are placed on the pending connection list of the listener socket.
43 * When future packets are received for the address the listener socket is
44 * bound to, we check if the source of the packet is from one that has an
45 * existing pending connection. If it does, we process the packet for the
46 * pending socket. When that socket reaches the connected state, it is removed
47 * from the listener socket's pending list and enqueued in the listener
48 * socket's accept queue. Callers of accept(2) will accept connected sockets
49 * from the listener socket's accept queue. If the socket cannot be accepted
50 * for some reason then it is marked rejected. Once the connection is
51 * accepted, it is owned by the user process and the responsibility for cleanup
52 * falls with that user process.
54 * - It is possible that these pending sockets will never reach the connected
55 * state; in fact, we may never receive another packet after the connection
56 * request. Because of this, we must schedule a cleanup function to run in the
57 * future, after some amount of time passes where a connection should have been
58 * established. This function ensures that the socket is off all lists so it
59 * cannot be retrieved, then drops all references to the socket so it is cleaned
60 * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this
61 * function will also cleanup rejected sockets, those that reach the connected
62 * state but leave it before they have been accepted.
64 * - Lock ordering for pending or accept queue sockets is:
66 * lock_sock(listener);
67 * lock_sock_nested(pending, SINGLE_DEPTH_NESTING);
69 * Using explicit nested locking keeps lockdep happy since normally only one
70 * lock of a given class may be taken at a time.
72 * - Sockets created by user action will be cleaned up when the user process
73 * calls close(2), causing our release implementation to be called. Our release
74 * implementation will perform some cleanup then drop the last reference so our
75 * sk_destruct implementation is invoked. Our sk_destruct implementation will
76 * perform additional cleanup that's common for both types of sockets.
78 * - A socket's reference count is what ensures that the structure won't be
79 * freed. Each entry in a list (such as the "global" bound and connected tables
80 * and the listener socket's pending list and connected queue) ensures a
81 * reference. When we defer work until process context and pass a socket as our
82 * argument, we must ensure the reference count is increased to ensure the
83 * socket isn't freed before the function is run; the deferred function will
84 * then drop the reference.
87 #include <linux/types.h>
88 #include <linux/bitops.h>
89 #include <linux/cred.h>
90 #include <linux/init.h>
92 #include <linux/kernel.h>
93 #include <linux/kmod.h>
94 #include <linux/list.h>
95 #include <linux/miscdevice.h>
96 #include <linux/module.h>
97 #include <linux/mutex.h>
98 #include <linux/net.h>
99 #include <linux/poll.h>
100 #include <linux/random.h>
101 #include <linux/skbuff.h>
102 #include <linux/smp.h>
103 #include <linux/socket.h>
104 #include <linux/stddef.h>
105 #include <linux/unistd.h>
106 #include <linux/wait.h>
107 #include <linux/workqueue.h>
108 #include <net/sock.h>
109 #include <net/af_vsock.h>
111 static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
112 static void vsock_sk_destruct(struct sock *sk);
113 static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
115 /* Protocol family. */
116 static struct proto vsock_proto = {
118 .owner = THIS_MODULE,
119 .obj_size = sizeof(struct vsock_sock),
122 /* The default peer timeout indicates how long we will wait for a peer response
123 * to a control message.
125 #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
127 static const struct vsock_transport *transport;
128 static DEFINE_MUTEX(vsock_register_mutex);
132 /* Get the ID of the local context. This is transport dependent. */
134 int vm_sockets_get_local_cid(void)
136 return transport->get_local_cid();
138 EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid);
142 /* Each bound VSocket is stored in the bind hash table and each connected
143 * VSocket is stored in the connected hash table.
145 * Unbound sockets are all put on the same list attached to the end of the hash
146 * table (vsock_unbound_sockets). Bound sockets are added to the hash table in
147 * the bucket that their local address hashes to (vsock_bound_sockets(addr)
148 * represents the list that addr hashes to).
150 * Specifically, we initialize the vsock_bind_table array to a size of
151 * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through
152 * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and
153 * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function
154 * mods with VSOCK_HASH_SIZE to ensure this.
156 #define VSOCK_HASH_SIZE 251
157 #define MAX_PORT_RETRIES 24
159 #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE)
160 #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)])
161 #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE])
163 /* XXX This can probably be implemented in a better way. */
164 #define VSOCK_CONN_HASH(src, dst) \
165 (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE)
166 #define vsock_connected_sockets(src, dst) \
167 (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)])
168 #define vsock_connected_sockets_vsk(vsk) \
169 vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr)
171 static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
172 static struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
173 static DEFINE_SPINLOCK(vsock_table_lock);
175 /* Autobind this socket to the local address if necessary. */
176 static int vsock_auto_bind(struct vsock_sock *vsk)
178 struct sock *sk = sk_vsock(vsk);
179 struct sockaddr_vm local_addr;
181 if (vsock_addr_bound(&vsk->local_addr))
183 vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
184 return __vsock_bind(sk, &local_addr);
187 static void vsock_init_tables(void)
191 for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++)
192 INIT_LIST_HEAD(&vsock_bind_table[i]);
194 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++)
195 INIT_LIST_HEAD(&vsock_connected_table[i]);
198 static void __vsock_insert_bound(struct list_head *list,
199 struct vsock_sock *vsk)
202 list_add(&vsk->bound_table, list);
205 static void __vsock_insert_connected(struct list_head *list,
206 struct vsock_sock *vsk)
209 list_add(&vsk->connected_table, list);
212 static void __vsock_remove_bound(struct vsock_sock *vsk)
214 list_del_init(&vsk->bound_table);
218 static void __vsock_remove_connected(struct vsock_sock *vsk)
220 list_del_init(&vsk->connected_table);
224 static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
226 struct vsock_sock *vsk;
228 list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table)
229 if (addr->svm_port == vsk->local_addr.svm_port)
230 return sk_vsock(vsk);
235 static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
236 struct sockaddr_vm *dst)
238 struct vsock_sock *vsk;
240 list_for_each_entry(vsk, vsock_connected_sockets(src, dst),
242 if (vsock_addr_equals_addr(src, &vsk->remote_addr) &&
243 dst->svm_port == vsk->local_addr.svm_port) {
244 return sk_vsock(vsk);
251 static bool __vsock_in_bound_table(struct vsock_sock *vsk)
253 return !list_empty(&vsk->bound_table);
256 static bool __vsock_in_connected_table(struct vsock_sock *vsk)
258 return !list_empty(&vsk->connected_table);
261 static void vsock_insert_unbound(struct vsock_sock *vsk)
263 spin_lock_bh(&vsock_table_lock);
264 __vsock_insert_bound(vsock_unbound_sockets, vsk);
265 spin_unlock_bh(&vsock_table_lock);
268 void vsock_insert_connected(struct vsock_sock *vsk)
270 struct list_head *list = vsock_connected_sockets(
271 &vsk->remote_addr, &vsk->local_addr);
273 spin_lock_bh(&vsock_table_lock);
274 __vsock_insert_connected(list, vsk);
275 spin_unlock_bh(&vsock_table_lock);
277 EXPORT_SYMBOL_GPL(vsock_insert_connected);
279 void vsock_remove_bound(struct vsock_sock *vsk)
281 spin_lock_bh(&vsock_table_lock);
282 __vsock_remove_bound(vsk);
283 spin_unlock_bh(&vsock_table_lock);
285 EXPORT_SYMBOL_GPL(vsock_remove_bound);
287 void vsock_remove_connected(struct vsock_sock *vsk)
289 spin_lock_bh(&vsock_table_lock);
290 __vsock_remove_connected(vsk);
291 spin_unlock_bh(&vsock_table_lock);
293 EXPORT_SYMBOL_GPL(vsock_remove_connected);
295 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
299 spin_lock_bh(&vsock_table_lock);
300 sk = __vsock_find_bound_socket(addr);
304 spin_unlock_bh(&vsock_table_lock);
308 EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
310 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
311 struct sockaddr_vm *dst)
315 spin_lock_bh(&vsock_table_lock);
316 sk = __vsock_find_connected_socket(src, dst);
320 spin_unlock_bh(&vsock_table_lock);
324 EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
326 static bool vsock_in_bound_table(struct vsock_sock *vsk)
330 spin_lock_bh(&vsock_table_lock);
331 ret = __vsock_in_bound_table(vsk);
332 spin_unlock_bh(&vsock_table_lock);
337 static bool vsock_in_connected_table(struct vsock_sock *vsk)
341 spin_lock_bh(&vsock_table_lock);
342 ret = __vsock_in_connected_table(vsk);
343 spin_unlock_bh(&vsock_table_lock);
348 void vsock_remove_sock(struct vsock_sock *vsk)
350 if (vsock_in_bound_table(vsk))
351 vsock_remove_bound(vsk);
353 if (vsock_in_connected_table(vsk))
354 vsock_remove_connected(vsk);
356 EXPORT_SYMBOL_GPL(vsock_remove_sock);
358 void vsock_for_each_connected_socket(void (*fn)(struct sock *sk))
362 spin_lock_bh(&vsock_table_lock);
364 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) {
365 struct vsock_sock *vsk;
366 list_for_each_entry(vsk, &vsock_connected_table[i],
371 spin_unlock_bh(&vsock_table_lock);
373 EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket);
375 void vsock_add_pending(struct sock *listener, struct sock *pending)
377 struct vsock_sock *vlistener;
378 struct vsock_sock *vpending;
380 vlistener = vsock_sk(listener);
381 vpending = vsock_sk(pending);
385 list_add_tail(&vpending->pending_links, &vlistener->pending_links);
387 EXPORT_SYMBOL_GPL(vsock_add_pending);
389 void vsock_remove_pending(struct sock *listener, struct sock *pending)
391 struct vsock_sock *vpending = vsock_sk(pending);
393 list_del_init(&vpending->pending_links);
397 EXPORT_SYMBOL_GPL(vsock_remove_pending);
399 void vsock_enqueue_accept(struct sock *listener, struct sock *connected)
401 struct vsock_sock *vlistener;
402 struct vsock_sock *vconnected;
404 vlistener = vsock_sk(listener);
405 vconnected = vsock_sk(connected);
407 sock_hold(connected);
409 list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue);
411 EXPORT_SYMBOL_GPL(vsock_enqueue_accept);
413 static struct sock *vsock_dequeue_accept(struct sock *listener)
415 struct vsock_sock *vlistener;
416 struct vsock_sock *vconnected;
418 vlistener = vsock_sk(listener);
420 if (list_empty(&vlistener->accept_queue))
423 vconnected = list_entry(vlistener->accept_queue.next,
424 struct vsock_sock, accept_queue);
426 list_del_init(&vconnected->accept_queue);
428 /* The caller will need a reference on the connected socket so we let
429 * it call sock_put().
432 return sk_vsock(vconnected);
435 static bool vsock_is_accept_queue_empty(struct sock *sk)
437 struct vsock_sock *vsk = vsock_sk(sk);
438 return list_empty(&vsk->accept_queue);
441 static bool vsock_is_pending(struct sock *sk)
443 struct vsock_sock *vsk = vsock_sk(sk);
444 return !list_empty(&vsk->pending_links);
447 static int vsock_send_shutdown(struct sock *sk, int mode)
449 return transport->shutdown(vsock_sk(sk), mode);
452 static void vsock_pending_work(struct work_struct *work)
455 struct sock *listener;
456 struct vsock_sock *vsk;
459 vsk = container_of(work, struct vsock_sock, pending_work.work);
461 listener = vsk->listener;
465 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
467 if (vsock_is_pending(sk)) {
468 vsock_remove_pending(listener, sk);
470 listener->sk_ack_backlog--;
471 } else if (!vsk->rejected) {
472 /* We are not on the pending list and accept() did not reject
473 * us, so we must have been accepted by our user process. We
474 * just need to drop our references to the sockets and be on
481 /* We need to remove ourself from the global connected sockets list so
482 * incoming packets can't find this socket, and to reduce the reference
485 if (vsock_in_connected_table(vsk))
486 vsock_remove_connected(vsk);
488 sk->sk_state = SS_FREE;
492 release_sock(listener);
500 /**** SOCKET OPERATIONS ****/
502 static int __vsock_bind_stream(struct vsock_sock *vsk,
503 struct sockaddr_vm *addr)
506 struct sockaddr_vm new_addr;
509 port = LAST_RESERVED_PORT + 1 +
510 prandom_u32_max(U32_MAX - LAST_RESERVED_PORT);
512 vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
514 if (addr->svm_port == VMADDR_PORT_ANY) {
518 for (i = 0; i < MAX_PORT_RETRIES; i++) {
519 if (port <= LAST_RESERVED_PORT)
520 port = LAST_RESERVED_PORT + 1;
522 new_addr.svm_port = port++;
524 if (!__vsock_find_bound_socket(&new_addr)) {
531 return -EADDRNOTAVAIL;
533 /* If port is in reserved range, ensure caller
534 * has necessary privileges.
536 if (addr->svm_port <= LAST_RESERVED_PORT &&
537 !capable(CAP_NET_BIND_SERVICE)) {
541 if (__vsock_find_bound_socket(&new_addr))
545 vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
547 /* Remove stream sockets from the unbound list and add them to the hash
548 * table for easy lookup by its address. The unbound list is simply an
549 * extra entry at the end of the hash table, a trick used by AF_UNIX.
551 __vsock_remove_bound(vsk);
552 __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk);
557 static int __vsock_bind_dgram(struct vsock_sock *vsk,
558 struct sockaddr_vm *addr)
560 return transport->dgram_bind(vsk, addr);
563 static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
565 struct vsock_sock *vsk = vsock_sk(sk);
569 /* First ensure this socket isn't already bound. */
570 if (vsock_addr_bound(&vsk->local_addr))
573 /* Now bind to the provided address or select appropriate values if
574 * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that
575 * like AF_INET prevents binding to a non-local IP address (in most
576 * cases), we only allow binding to the local CID.
578 cid = transport->get_local_cid();
579 if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY)
580 return -EADDRNOTAVAIL;
582 switch (sk->sk_socket->type) {
584 spin_lock_bh(&vsock_table_lock);
585 retval = __vsock_bind_stream(vsk, addr);
586 spin_unlock_bh(&vsock_table_lock);
590 retval = __vsock_bind_dgram(vsk, addr);
601 static void vsock_connect_timeout(struct work_struct *work);
603 struct sock *__vsock_create(struct net *net,
611 struct vsock_sock *psk;
612 struct vsock_sock *vsk;
614 sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern);
618 sock_init_data(sock, sk);
620 /* sk->sk_type is normally set in sock_init_data, but only if sock is
621 * non-NULL. We make sure that our sockets always have a type by
622 * setting it here if needed.
628 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
629 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
631 sk->sk_destruct = vsock_sk_destruct;
632 sk->sk_backlog_rcv = vsock_queue_rcv_skb;
634 sock_reset_flag(sk, SOCK_DONE);
636 INIT_LIST_HEAD(&vsk->bound_table);
637 INIT_LIST_HEAD(&vsk->connected_table);
638 vsk->listener = NULL;
639 INIT_LIST_HEAD(&vsk->pending_links);
640 INIT_LIST_HEAD(&vsk->accept_queue);
641 vsk->rejected = false;
642 vsk->sent_request = false;
643 vsk->ignore_connecting_rst = false;
644 vsk->peer_shutdown = 0;
645 INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout);
646 INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work);
648 psk = parent ? vsock_sk(parent) : NULL;
650 vsk->trusted = psk->trusted;
651 vsk->owner = get_cred(psk->owner);
652 vsk->connect_timeout = psk->connect_timeout;
653 security_sk_clone(parent, sk);
655 vsk->trusted = ns_capable_noaudit(&init_user_ns, CAP_NET_ADMIN);
656 vsk->owner = get_current_cred();
657 vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT;
660 if (transport->init(vsk, psk) < 0) {
666 vsock_insert_unbound(vsk);
670 EXPORT_SYMBOL_GPL(__vsock_create);
672 static void __vsock_release(struct sock *sk)
676 struct sock *pending;
677 struct vsock_sock *vsk;
680 pending = NULL; /* Compiler warning. */
682 transport->release(vsk);
686 sk->sk_shutdown = SHUTDOWN_MASK;
688 while ((skb = skb_dequeue(&sk->sk_receive_queue)))
691 /* Clean up any sockets that never were accepted. */
692 while ((pending = vsock_dequeue_accept(sk)) != NULL) {
693 __vsock_release(pending);
702 static void vsock_sk_destruct(struct sock *sk)
704 struct vsock_sock *vsk = vsock_sk(sk);
706 transport->destruct(vsk);
708 /* When clearing these addresses, there's no need to set the family and
709 * possibly register the address family with the kernel.
711 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
712 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
714 put_cred(vsk->owner);
717 static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
721 err = sock_queue_rcv_skb(sk, skb);
728 s64 vsock_stream_has_data(struct vsock_sock *vsk)
730 return transport->stream_has_data(vsk);
732 EXPORT_SYMBOL_GPL(vsock_stream_has_data);
734 s64 vsock_stream_has_space(struct vsock_sock *vsk)
736 return transport->stream_has_space(vsk);
738 EXPORT_SYMBOL_GPL(vsock_stream_has_space);
740 static int vsock_release(struct socket *sock)
742 __vsock_release(sock->sk);
744 sock->state = SS_FREE;
750 vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
754 struct sockaddr_vm *vm_addr;
758 if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0)
762 err = __vsock_bind(sk, vm_addr);
768 static int vsock_getname(struct socket *sock,
769 struct sockaddr *addr, int *addr_len, int peer)
773 struct vsock_sock *vsk;
774 struct sockaddr_vm *vm_addr;
783 if (sock->state != SS_CONNECTED) {
787 vm_addr = &vsk->remote_addr;
789 vm_addr = &vsk->local_addr;
797 /* sys_getsockname() and sys_getpeername() pass us a
798 * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately
799 * that macro is defined in socket.c instead of .h, so we hardcode its
802 BUILD_BUG_ON(sizeof(*vm_addr) > 128);
803 memcpy(addr, vm_addr, sizeof(*vm_addr));
804 *addr_len = sizeof(*vm_addr);
811 static int vsock_shutdown(struct socket *sock, int mode)
816 /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses
817 * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode
818 * here like the other address families do. Note also that the
819 * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3),
820 * which is what we want.
824 if ((mode & ~SHUTDOWN_MASK) || !mode)
827 /* If this is a STREAM socket and it is not connected then bail out
828 * immediately. If it is a DGRAM socket then we must first kick the
829 * socket so that it wakes up from any sleeping calls, for example
830 * recv(), and then afterwards return the error.
836 if (sock->state == SS_UNCONNECTED) {
838 if (sk->sk_type == SOCK_STREAM)
841 sock->state = SS_DISCONNECTING;
845 /* Receive and send shutdowns are treated alike. */
846 mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN);
848 sk->sk_shutdown |= mode;
849 sk->sk_state_change(sk);
851 if (sk->sk_type == SOCK_STREAM) {
852 sock_reset_flag(sk, SOCK_DONE);
853 vsock_send_shutdown(sk, mode);
862 static unsigned int vsock_poll(struct file *file, struct socket *sock,
867 struct vsock_sock *vsk;
872 poll_wait(file, sk_sleep(sk), wait);
876 /* Signify that there has been an error on this socket. */
879 /* INET sockets treat local write shutdown and peer write shutdown as a
880 * case of POLLHUP set.
882 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
883 ((sk->sk_shutdown & SEND_SHUTDOWN) &&
884 (vsk->peer_shutdown & SEND_SHUTDOWN))) {
888 if (sk->sk_shutdown & RCV_SHUTDOWN ||
889 vsk->peer_shutdown & SEND_SHUTDOWN) {
893 if (sock->type == SOCK_DGRAM) {
894 /* For datagram sockets we can read if there is something in
895 * the queue and write as long as the socket isn't shutdown for
898 if (!skb_queue_empty(&sk->sk_receive_queue) ||
899 (sk->sk_shutdown & RCV_SHUTDOWN)) {
900 mask |= POLLIN | POLLRDNORM;
903 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
904 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
906 } else if (sock->type == SOCK_STREAM) {
909 /* Listening sockets that have connections in their accept
912 if (sk->sk_state == VSOCK_SS_LISTEN
913 && !vsock_is_accept_queue_empty(sk))
914 mask |= POLLIN | POLLRDNORM;
916 /* If there is something in the queue then we can read. */
917 if (transport->stream_is_active(vsk) &&
918 !(sk->sk_shutdown & RCV_SHUTDOWN)) {
919 bool data_ready_now = false;
920 int ret = transport->notify_poll_in(
921 vsk, 1, &data_ready_now);
926 mask |= POLLIN | POLLRDNORM;
931 /* Sockets whose connections have been closed, reset, or
932 * terminated should also be considered read, and we check the
933 * shutdown flag for that.
935 if (sk->sk_shutdown & RCV_SHUTDOWN ||
936 vsk->peer_shutdown & SEND_SHUTDOWN) {
937 mask |= POLLIN | POLLRDNORM;
940 /* Connected sockets that can produce data can be written. */
941 if (sk->sk_state == SS_CONNECTED) {
942 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
943 bool space_avail_now = false;
944 int ret = transport->notify_poll_out(
945 vsk, 1, &space_avail_now);
950 /* Remove POLLWRBAND since INET
951 * sockets are not setting it.
953 mask |= POLLOUT | POLLWRNORM;
959 /* Simulate INET socket poll behaviors, which sets
960 * POLLOUT|POLLWRNORM when peer is closed and nothing to read,
961 * but local send is not shutdown.
963 if (sk->sk_state == SS_UNCONNECTED) {
964 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
965 mask |= POLLOUT | POLLWRNORM;
975 static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
980 struct vsock_sock *vsk;
981 struct sockaddr_vm *remote_addr;
983 if (msg->msg_flags & MSG_OOB)
986 /* For now, MSG_DONTWAIT is always assumed... */
993 err = vsock_auto_bind(vsk);
998 /* If the provided message contains an address, use that. Otherwise
999 * fall back on the socket's remote handle (if it has been connected).
1001 if (msg->msg_name &&
1002 vsock_addr_cast(msg->msg_name, msg->msg_namelen,
1003 &remote_addr) == 0) {
1004 /* Ensure this address is of the right type and is a valid
1008 if (remote_addr->svm_cid == VMADDR_CID_ANY)
1009 remote_addr->svm_cid = transport->get_local_cid();
1011 if (!vsock_addr_bound(remote_addr)) {
1015 } else if (sock->state == SS_CONNECTED) {
1016 remote_addr = &vsk->remote_addr;
1018 if (remote_addr->svm_cid == VMADDR_CID_ANY)
1019 remote_addr->svm_cid = transport->get_local_cid();
1021 /* XXX Should connect() or this function ensure remote_addr is
1024 if (!vsock_addr_bound(&vsk->remote_addr)) {
1033 if (!transport->dgram_allow(remote_addr->svm_cid,
1034 remote_addr->svm_port)) {
1039 err = transport->dgram_enqueue(vsk, remote_addr, msg, len);
1046 static int vsock_dgram_connect(struct socket *sock,
1047 struct sockaddr *addr, int addr_len, int flags)
1051 struct vsock_sock *vsk;
1052 struct sockaddr_vm *remote_addr;
1057 err = vsock_addr_cast(addr, addr_len, &remote_addr);
1058 if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) {
1060 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY,
1062 sock->state = SS_UNCONNECTED;
1065 } else if (err != 0)
1070 err = vsock_auto_bind(vsk);
1074 if (!transport->dgram_allow(remote_addr->svm_cid,
1075 remote_addr->svm_port)) {
1080 memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr));
1081 sock->state = SS_CONNECTED;
1088 static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
1089 size_t len, int flags)
1091 return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags);
1094 static const struct proto_ops vsock_dgram_ops = {
1096 .owner = THIS_MODULE,
1097 .release = vsock_release,
1099 .connect = vsock_dgram_connect,
1100 .socketpair = sock_no_socketpair,
1101 .accept = sock_no_accept,
1102 .getname = vsock_getname,
1104 .ioctl = sock_no_ioctl,
1105 .listen = sock_no_listen,
1106 .shutdown = vsock_shutdown,
1107 .setsockopt = sock_no_setsockopt,
1108 .getsockopt = sock_no_getsockopt,
1109 .sendmsg = vsock_dgram_sendmsg,
1110 .recvmsg = vsock_dgram_recvmsg,
1111 .mmap = sock_no_mmap,
1112 .sendpage = sock_no_sendpage,
1115 static int vsock_transport_cancel_pkt(struct vsock_sock *vsk)
1117 if (!transport->cancel_pkt)
1120 return transport->cancel_pkt(vsk);
1123 static void vsock_connect_timeout(struct work_struct *work)
1126 struct vsock_sock *vsk;
1128 vsk = container_of(work, struct vsock_sock, connect_work.work);
1132 if (sk->sk_state == SS_CONNECTING &&
1133 (sk->sk_shutdown != SHUTDOWN_MASK)) {
1134 sk->sk_state = SS_UNCONNECTED;
1135 sk->sk_err = ETIMEDOUT;
1136 sk->sk_error_report(sk);
1137 vsock_transport_cancel_pkt(vsk);
1144 static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
1145 int addr_len, int flags)
1149 struct vsock_sock *vsk;
1150 struct sockaddr_vm *remote_addr;
1160 /* XXX AF_UNSPEC should make us disconnect like AF_INET. */
1161 switch (sock->state) {
1165 case SS_DISCONNECTING:
1169 /* This continues on so we can move sock into the SS_CONNECTED
1170 * state once the connection has completed (at which point err
1171 * will be set to zero also). Otherwise, we will either wait
1172 * for the connection or return -EALREADY should this be a
1173 * non-blocking call.
1176 if (flags & O_NONBLOCK)
1180 if ((sk->sk_state == VSOCK_SS_LISTEN) ||
1181 vsock_addr_cast(addr, addr_len, &remote_addr) != 0) {
1186 /* The hypervisor and well-known contexts do not have socket
1189 if (!transport->stream_allow(remote_addr->svm_cid,
1190 remote_addr->svm_port)) {
1195 /* Set the remote address that we are connecting to. */
1196 memcpy(&vsk->remote_addr, remote_addr,
1197 sizeof(vsk->remote_addr));
1199 err = vsock_auto_bind(vsk);
1203 sk->sk_state = SS_CONNECTING;
1205 err = transport->connect(vsk);
1209 /* Mark sock as connecting and set the error code to in
1210 * progress in case this is a non-blocking connect.
1212 sock->state = SS_CONNECTING;
1216 /* The receive path will handle all communication until we are able to
1217 * enter the connected state. Here we wait for the connection to be
1218 * completed or a notification of an error.
1220 timeout = vsk->connect_timeout;
1221 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1223 while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) {
1224 if (flags & O_NONBLOCK) {
1225 /* If we're not going to block, we schedule a timeout
1226 * function to generate a timeout on the connection
1227 * attempt, in case the peer doesn't respond in a
1228 * timely manner. We hold on to the socket until the
1232 schedule_delayed_work(&vsk->connect_work, timeout);
1234 /* Skip ahead to preserve error code set above. */
1239 timeout = schedule_timeout(timeout);
1242 if (signal_pending(current)) {
1243 err = sock_intr_errno(timeout);
1244 sk->sk_state = SS_UNCONNECTED;
1245 sock->state = SS_UNCONNECTED;
1246 vsock_transport_cancel_pkt(vsk);
1248 } else if (timeout == 0) {
1250 sk->sk_state = SS_UNCONNECTED;
1251 sock->state = SS_UNCONNECTED;
1252 vsock_transport_cancel_pkt(vsk);
1256 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1261 sk->sk_state = SS_UNCONNECTED;
1262 sock->state = SS_UNCONNECTED;
1268 finish_wait(sk_sleep(sk), &wait);
1274 static int vsock_accept(struct socket *sock, struct socket *newsock, int flags)
1276 struct sock *listener;
1278 struct sock *connected;
1279 struct vsock_sock *vconnected;
1284 listener = sock->sk;
1286 lock_sock(listener);
1288 if (sock->type != SOCK_STREAM) {
1293 if (listener->sk_state != VSOCK_SS_LISTEN) {
1298 /* Wait for children sockets to appear; these are the new sockets
1299 * created upon connection establishment.
1301 timeout = sock_rcvtimeo(listener, flags & O_NONBLOCK);
1302 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1304 while ((connected = vsock_dequeue_accept(listener)) == NULL &&
1305 listener->sk_err == 0) {
1306 release_sock(listener);
1307 timeout = schedule_timeout(timeout);
1308 finish_wait(sk_sleep(listener), &wait);
1309 lock_sock(listener);
1311 if (signal_pending(current)) {
1312 err = sock_intr_errno(timeout);
1314 } else if (timeout == 0) {
1319 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1321 finish_wait(sk_sleep(listener), &wait);
1323 if (listener->sk_err)
1324 err = -listener->sk_err;
1327 listener->sk_ack_backlog--;
1329 lock_sock_nested(connected, SINGLE_DEPTH_NESTING);
1330 vconnected = vsock_sk(connected);
1332 /* If the listener socket has received an error, then we should
1333 * reject this socket and return. Note that we simply mark the
1334 * socket rejected, drop our reference, and let the cleanup
1335 * function handle the cleanup; the fact that we found it in
1336 * the listener's accept queue guarantees that the cleanup
1337 * function hasn't run yet.
1340 vconnected->rejected = true;
1342 newsock->state = SS_CONNECTED;
1343 sock_graft(connected, newsock);
1346 release_sock(connected);
1347 sock_put(connected);
1351 release_sock(listener);
1355 static int vsock_listen(struct socket *sock, int backlog)
1359 struct vsock_sock *vsk;
1365 if (sock->type != SOCK_STREAM) {
1370 if (sock->state != SS_UNCONNECTED) {
1377 if (!vsock_addr_bound(&vsk->local_addr)) {
1382 sk->sk_max_ack_backlog = backlog;
1383 sk->sk_state = VSOCK_SS_LISTEN;
1392 static int vsock_stream_setsockopt(struct socket *sock,
1395 char __user *optval,
1396 unsigned int optlen)
1400 struct vsock_sock *vsk;
1403 if (level != AF_VSOCK)
1404 return -ENOPROTOOPT;
1406 #define COPY_IN(_v) \
1408 if (optlen < sizeof(_v)) { \
1412 if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \
1425 case SO_VM_SOCKETS_BUFFER_SIZE:
1427 transport->set_buffer_size(vsk, val);
1430 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1432 transport->set_max_buffer_size(vsk, val);
1435 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1437 transport->set_min_buffer_size(vsk, val);
1440 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1443 if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC &&
1444 tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) {
1445 vsk->connect_timeout = tv.tv_sec * HZ +
1446 DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ));
1447 if (vsk->connect_timeout == 0)
1448 vsk->connect_timeout =
1449 VSOCK_DEFAULT_CONNECT_TIMEOUT;
1469 static int vsock_stream_getsockopt(struct socket *sock,
1470 int level, int optname,
1471 char __user *optval,
1477 struct vsock_sock *vsk;
1480 if (level != AF_VSOCK)
1481 return -ENOPROTOOPT;
1483 err = get_user(len, optlen);
1487 #define COPY_OUT(_v) \
1489 if (len < sizeof(_v)) \
1493 if (copy_to_user(optval, &_v, len) != 0) \
1503 case SO_VM_SOCKETS_BUFFER_SIZE:
1504 val = transport->get_buffer_size(vsk);
1508 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1509 val = transport->get_max_buffer_size(vsk);
1513 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1514 val = transport->get_min_buffer_size(vsk);
1518 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1520 tv.tv_sec = vsk->connect_timeout / HZ;
1522 (vsk->connect_timeout -
1523 tv.tv_sec * HZ) * (1000000 / HZ);
1528 return -ENOPROTOOPT;
1531 err = put_user(len, optlen);
1540 static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
1544 struct vsock_sock *vsk;
1545 ssize_t total_written;
1548 struct vsock_transport_send_notify_data send_data;
1549 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1556 if (msg->msg_flags & MSG_OOB)
1561 /* Callers should not provide a destination with stream sockets. */
1562 if (msg->msg_namelen) {
1563 err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP;
1567 /* Send data only if both sides are not shutdown in the direction. */
1568 if (sk->sk_shutdown & SEND_SHUTDOWN ||
1569 vsk->peer_shutdown & RCV_SHUTDOWN) {
1574 if (sk->sk_state != SS_CONNECTED ||
1575 !vsock_addr_bound(&vsk->local_addr)) {
1580 if (!vsock_addr_bound(&vsk->remote_addr)) {
1581 err = -EDESTADDRREQ;
1585 /* Wait for room in the produce queue to enqueue our user's data. */
1586 timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1588 err = transport->notify_send_init(vsk, &send_data);
1592 while (total_written < len) {
1595 add_wait_queue(sk_sleep(sk), &wait);
1596 while (vsock_stream_has_space(vsk) == 0 &&
1598 !(sk->sk_shutdown & SEND_SHUTDOWN) &&
1599 !(vsk->peer_shutdown & RCV_SHUTDOWN)) {
1601 /* Don't wait for non-blocking sockets. */
1604 remove_wait_queue(sk_sleep(sk), &wait);
1608 err = transport->notify_send_pre_block(vsk, &send_data);
1610 remove_wait_queue(sk_sleep(sk), &wait);
1615 timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout);
1617 if (signal_pending(current)) {
1618 err = sock_intr_errno(timeout);
1619 remove_wait_queue(sk_sleep(sk), &wait);
1621 } else if (timeout == 0) {
1623 remove_wait_queue(sk_sleep(sk), &wait);
1627 remove_wait_queue(sk_sleep(sk), &wait);
1629 /* These checks occur both as part of and after the loop
1630 * conditional since we need to check before and after
1636 } else if ((sk->sk_shutdown & SEND_SHUTDOWN) ||
1637 (vsk->peer_shutdown & RCV_SHUTDOWN)) {
1642 err = transport->notify_send_pre_enqueue(vsk, &send_data);
1646 /* Note that enqueue will only write as many bytes as are free
1647 * in the produce queue, so we don't need to ensure len is
1648 * smaller than the queue size. It is the caller's
1649 * responsibility to check how many bytes we were able to send.
1652 written = transport->stream_enqueue(
1654 len - total_written);
1660 total_written += written;
1662 err = transport->notify_send_post_enqueue(
1663 vsk, written, &send_data);
1670 if (total_written > 0)
1671 err = total_written;
1679 vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1683 struct vsock_sock *vsk;
1688 struct vsock_transport_recv_notify_data recv_data;
1698 if (sk->sk_state != SS_CONNECTED) {
1699 /* Recvmsg is supposed to return 0 if a peer performs an
1700 * orderly shutdown. Differentiate between that case and when a
1701 * peer has not connected or a local shutdown occured with the
1704 if (sock_flag(sk, SOCK_DONE))
1712 if (flags & MSG_OOB) {
1717 /* We don't check peer_shutdown flag here since peer may actually shut
1718 * down, but there can be data in the queue that a local socket can
1721 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1726 /* It is valid on Linux to pass in a zero-length receive buffer. This
1727 * is not an error. We may as well bail out now.
1734 /* We must not copy less than target bytes into the user's buffer
1735 * before returning successfully, so we wait for the consume queue to
1736 * have that much data to consume before dequeueing. Note that this
1737 * makes it impossible to handle cases where target is greater than the
1740 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1741 if (target >= transport->stream_rcvhiwat(vsk)) {
1745 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1748 err = transport->notify_recv_init(vsk, target, &recv_data);
1756 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1757 ready = vsock_stream_has_data(vsk);
1760 if (sk->sk_err != 0 ||
1761 (sk->sk_shutdown & RCV_SHUTDOWN) ||
1762 (vsk->peer_shutdown & SEND_SHUTDOWN)) {
1763 finish_wait(sk_sleep(sk), &wait);
1766 /* Don't wait for non-blocking sockets. */
1769 finish_wait(sk_sleep(sk), &wait);
1773 err = transport->notify_recv_pre_block(
1774 vsk, target, &recv_data);
1776 finish_wait(sk_sleep(sk), &wait);
1780 timeout = schedule_timeout(timeout);
1783 if (signal_pending(current)) {
1784 err = sock_intr_errno(timeout);
1785 finish_wait(sk_sleep(sk), &wait);
1787 } else if (timeout == 0) {
1789 finish_wait(sk_sleep(sk), &wait);
1795 finish_wait(sk_sleep(sk), &wait);
1798 /* Invalid queue pair content. XXX This should
1799 * be changed to a connection reset in a later
1807 err = transport->notify_recv_pre_dequeue(
1808 vsk, target, &recv_data);
1812 read = transport->stream_dequeue(
1814 len - copied, flags);
1822 err = transport->notify_recv_post_dequeue(
1824 !(flags & MSG_PEEK), &recv_data);
1828 if (read >= target || flags & MSG_PEEK)
1837 else if (sk->sk_shutdown & RCV_SHUTDOWN)
1848 static const struct proto_ops vsock_stream_ops = {
1850 .owner = THIS_MODULE,
1851 .release = vsock_release,
1853 .connect = vsock_stream_connect,
1854 .socketpair = sock_no_socketpair,
1855 .accept = vsock_accept,
1856 .getname = vsock_getname,
1858 .ioctl = sock_no_ioctl,
1859 .listen = vsock_listen,
1860 .shutdown = vsock_shutdown,
1861 .setsockopt = vsock_stream_setsockopt,
1862 .getsockopt = vsock_stream_getsockopt,
1863 .sendmsg = vsock_stream_sendmsg,
1864 .recvmsg = vsock_stream_recvmsg,
1865 .mmap = sock_no_mmap,
1866 .sendpage = sock_no_sendpage,
1869 static int vsock_create(struct net *net, struct socket *sock,
1870 int protocol, int kern)
1875 if (protocol && protocol != PF_VSOCK)
1876 return -EPROTONOSUPPORT;
1878 switch (sock->type) {
1880 sock->ops = &vsock_dgram_ops;
1883 sock->ops = &vsock_stream_ops;
1886 return -ESOCKTNOSUPPORT;
1889 sock->state = SS_UNCONNECTED;
1891 return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM;
1894 static const struct net_proto_family vsock_family_ops = {
1896 .create = vsock_create,
1897 .owner = THIS_MODULE,
1900 static long vsock_dev_do_ioctl(struct file *filp,
1901 unsigned int cmd, void __user *ptr)
1903 u32 __user *p = ptr;
1907 case IOCTL_VM_SOCKETS_GET_LOCAL_CID:
1908 if (put_user(transport->get_local_cid(), p) != 0)
1913 pr_err("Unknown ioctl %d\n", cmd);
1920 static long vsock_dev_ioctl(struct file *filp,
1921 unsigned int cmd, unsigned long arg)
1923 return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg);
1926 #ifdef CONFIG_COMPAT
1927 static long vsock_dev_compat_ioctl(struct file *filp,
1928 unsigned int cmd, unsigned long arg)
1930 return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg));
1934 static const struct file_operations vsock_device_ops = {
1935 .owner = THIS_MODULE,
1936 .unlocked_ioctl = vsock_dev_ioctl,
1937 #ifdef CONFIG_COMPAT
1938 .compat_ioctl = vsock_dev_compat_ioctl,
1940 .open = nonseekable_open,
1943 static struct miscdevice vsock_device = {
1945 .fops = &vsock_device_ops,
1948 int __vsock_core_init(const struct vsock_transport *t, struct module *owner)
1950 int err = mutex_lock_interruptible(&vsock_register_mutex);
1960 /* Transport must be the owner of the protocol so that it can't
1961 * unload while there are open sockets.
1963 vsock_proto.owner = owner;
1966 vsock_init_tables();
1968 vsock_device.minor = MISC_DYNAMIC_MINOR;
1969 err = misc_register(&vsock_device);
1971 pr_err("Failed to register misc device\n");
1972 goto err_reset_transport;
1975 err = proto_register(&vsock_proto, 1); /* we want our slab */
1977 pr_err("Cannot register vsock protocol\n");
1978 goto err_deregister_misc;
1981 err = sock_register(&vsock_family_ops);
1983 pr_err("could not register af_vsock (%d) address family: %d\n",
1985 goto err_unregister_proto;
1988 mutex_unlock(&vsock_register_mutex);
1991 err_unregister_proto:
1992 proto_unregister(&vsock_proto);
1993 err_deregister_misc:
1994 misc_deregister(&vsock_device);
1995 err_reset_transport:
1998 mutex_unlock(&vsock_register_mutex);
2001 EXPORT_SYMBOL_GPL(__vsock_core_init);
2003 void vsock_core_exit(void)
2005 mutex_lock(&vsock_register_mutex);
2007 misc_deregister(&vsock_device);
2008 sock_unregister(AF_VSOCK);
2009 proto_unregister(&vsock_proto);
2011 /* We do not want the assignment below re-ordered. */
2015 mutex_unlock(&vsock_register_mutex);
2017 EXPORT_SYMBOL_GPL(vsock_core_exit);
2019 const struct vsock_transport *vsock_core_get_transport(void)
2021 /* vsock_register_mutex not taken since only the transport uses this
2022 * function and only while registered.
2026 EXPORT_SYMBOL_GPL(vsock_core_get_transport);
2028 MODULE_AUTHOR("VMware, Inc.");
2029 MODULE_DESCRIPTION("VMware Virtual Socket Family");
2030 MODULE_VERSION("1.0.2.0-k");
2031 MODULE_LICENSE("GPL v2");