1 // SPDX-License-Identifier: GPL-2.0-only
3 * VMware vSockets Driver
5 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
8 /* Implementation notes:
10 * - There are two kinds of sockets: those created by user action (such as
11 * calling socket(2)) and those created by incoming connection request packets.
13 * - There are two "global" tables, one for bound sockets (sockets that have
14 * specified an address that they are responsible for) and one for connected
15 * sockets (sockets that have established a connection with another socket).
16 * These tables are "global" in that all sockets on the system are placed
17 * within them. - Note, though, that the bound table contains an extra entry
18 * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in
19 * that list. The bound table is used solely for lookup of sockets when packets
20 * are received and that's not necessary for SOCK_DGRAM sockets since we create
21 * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM
22 * sockets out of the bound hash buckets will reduce the chance of collisions
23 * when looking for SOCK_STREAM sockets and prevents us from having to check the
24 * socket type in the hash table lookups.
26 * - Sockets created by user action will either be "client" sockets that
27 * initiate a connection or "server" sockets that listen for connections; we do
28 * not support simultaneous connects (two "client" sockets connecting).
30 * - "Server" sockets are referred to as listener sockets throughout this
31 * implementation because they are in the TCP_LISTEN state. When a
32 * connection request is received (the second kind of socket mentioned above),
33 * we create a new socket and refer to it as a pending socket. These pending
34 * sockets are placed on the pending connection list of the listener socket.
35 * When future packets are received for the address the listener socket is
36 * bound to, we check if the source of the packet is from one that has an
37 * existing pending connection. If it does, we process the packet for the
38 * pending socket. When that socket reaches the connected state, it is removed
39 * from the listener socket's pending list and enqueued in the listener
40 * socket's accept queue. Callers of accept(2) will accept connected sockets
41 * from the listener socket's accept queue. If the socket cannot be accepted
42 * for some reason then it is marked rejected. Once the connection is
43 * accepted, it is owned by the user process and the responsibility for cleanup
44 * falls with that user process.
46 * - It is possible that these pending sockets will never reach the connected
47 * state; in fact, we may never receive another packet after the connection
48 * request. Because of this, we must schedule a cleanup function to run in the
49 * future, after some amount of time passes where a connection should have been
50 * established. This function ensures that the socket is off all lists so it
51 * cannot be retrieved, then drops all references to the socket so it is cleaned
52 * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this
53 * function will also cleanup rejected sockets, those that reach the connected
54 * state but leave it before they have been accepted.
56 * - Lock ordering for pending or accept queue sockets is:
58 * lock_sock(listener);
59 * lock_sock_nested(pending, SINGLE_DEPTH_NESTING);
61 * Using explicit nested locking keeps lockdep happy since normally only one
62 * lock of a given class may be taken at a time.
64 * - Sockets created by user action will be cleaned up when the user process
65 * calls close(2), causing our release implementation to be called. Our release
66 * implementation will perform some cleanup then drop the last reference so our
67 * sk_destruct implementation is invoked. Our sk_destruct implementation will
68 * perform additional cleanup that's common for both types of sockets.
70 * - A socket's reference count is what ensures that the structure won't be
71 * freed. Each entry in a list (such as the "global" bound and connected tables
72 * and the listener socket's pending list and connected queue) ensures a
73 * reference. When we defer work until process context and pass a socket as our
74 * argument, we must ensure the reference count is increased to ensure the
75 * socket isn't freed before the function is run; the deferred function will
76 * then drop the reference.
78 * - sk->sk_state uses the TCP state constants because they are widely used by
79 * other address families and exposed to userspace tools like ss(8):
81 * TCP_CLOSE - unconnected
82 * TCP_SYN_SENT - connecting
83 * TCP_ESTABLISHED - connected
84 * TCP_CLOSING - disconnecting
85 * TCP_LISTEN - listening
88 #include <linux/types.h>
89 #include <linux/bitops.h>
90 #include <linux/cred.h>
91 #include <linux/init.h>
93 #include <linux/kernel.h>
94 #include <linux/sched/signal.h>
95 #include <linux/kmod.h>
96 #include <linux/list.h>
97 #include <linux/miscdevice.h>
98 #include <linux/module.h>
99 #include <linux/mutex.h>
100 #include <linux/net.h>
101 #include <linux/poll.h>
102 #include <linux/random.h>
103 #include <linux/skbuff.h>
104 #include <linux/smp.h>
105 #include <linux/socket.h>
106 #include <linux/stddef.h>
107 #include <linux/unistd.h>
108 #include <linux/wait.h>
109 #include <linux/workqueue.h>
110 #include <net/sock.h>
111 #include <net/af_vsock.h>
113 static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
114 static void vsock_sk_destruct(struct sock *sk);
115 static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
117 /* Protocol family. */
118 static struct proto vsock_proto = {
120 .owner = THIS_MODULE,
121 .obj_size = sizeof(struct vsock_sock),
124 /* The default peer timeout indicates how long we will wait for a peer response
125 * to a control message.
127 #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
129 #define VSOCK_DEFAULT_BUFFER_SIZE (1024 * 256)
130 #define VSOCK_DEFAULT_BUFFER_MAX_SIZE (1024 * 256)
131 #define VSOCK_DEFAULT_BUFFER_MIN_SIZE 128
133 /* Transport used for host->guest communication */
134 static const struct vsock_transport *transport_h2g;
135 /* Transport used for guest->host communication */
136 static const struct vsock_transport *transport_g2h;
137 /* Transport used for DGRAM communication */
138 static const struct vsock_transport *transport_dgram;
139 /* Transport used for local communication */
140 static const struct vsock_transport *transport_local;
141 static DEFINE_MUTEX(vsock_register_mutex);
145 /* Each bound VSocket is stored in the bind hash table and each connected
146 * VSocket is stored in the connected hash table.
148 * Unbound sockets are all put on the same list attached to the end of the hash
149 * table (vsock_unbound_sockets). Bound sockets are added to the hash table in
150 * the bucket that their local address hashes to (vsock_bound_sockets(addr)
151 * represents the list that addr hashes to).
153 * Specifically, we initialize the vsock_bind_table array to a size of
154 * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through
155 * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and
156 * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function
157 * mods with VSOCK_HASH_SIZE to ensure this.
159 #define MAX_PORT_RETRIES 24
161 #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE)
162 #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)])
163 #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE])
165 /* XXX This can probably be implemented in a better way. */
166 #define VSOCK_CONN_HASH(src, dst) \
167 (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE)
168 #define vsock_connected_sockets(src, dst) \
169 (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)])
170 #define vsock_connected_sockets_vsk(vsk) \
171 vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr)
173 struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
174 EXPORT_SYMBOL_GPL(vsock_bind_table);
175 struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
176 EXPORT_SYMBOL_GPL(vsock_connected_table);
177 DEFINE_SPINLOCK(vsock_table_lock);
178 EXPORT_SYMBOL_GPL(vsock_table_lock);
180 /* Autobind this socket to the local address if necessary. */
181 static int vsock_auto_bind(struct vsock_sock *vsk)
183 struct sock *sk = sk_vsock(vsk);
184 struct sockaddr_vm local_addr;
186 if (vsock_addr_bound(&vsk->local_addr))
188 vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
189 return __vsock_bind(sk, &local_addr);
192 static void vsock_init_tables(void)
196 for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++)
197 INIT_LIST_HEAD(&vsock_bind_table[i]);
199 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++)
200 INIT_LIST_HEAD(&vsock_connected_table[i]);
203 static void __vsock_insert_bound(struct list_head *list,
204 struct vsock_sock *vsk)
207 list_add(&vsk->bound_table, list);
210 static void __vsock_insert_connected(struct list_head *list,
211 struct vsock_sock *vsk)
214 list_add(&vsk->connected_table, list);
217 static void __vsock_remove_bound(struct vsock_sock *vsk)
219 list_del_init(&vsk->bound_table);
223 static void __vsock_remove_connected(struct vsock_sock *vsk)
225 list_del_init(&vsk->connected_table);
229 static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
231 struct vsock_sock *vsk;
233 list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) {
234 if (vsock_addr_equals_addr(addr, &vsk->local_addr))
235 return sk_vsock(vsk);
237 if (addr->svm_port == vsk->local_addr.svm_port &&
238 (vsk->local_addr.svm_cid == VMADDR_CID_ANY ||
239 addr->svm_cid == VMADDR_CID_ANY))
240 return sk_vsock(vsk);
246 static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
247 struct sockaddr_vm *dst)
249 struct vsock_sock *vsk;
251 list_for_each_entry(vsk, vsock_connected_sockets(src, dst),
253 if (vsock_addr_equals_addr(src, &vsk->remote_addr) &&
254 dst->svm_port == vsk->local_addr.svm_port) {
255 return sk_vsock(vsk);
262 static void vsock_insert_unbound(struct vsock_sock *vsk)
264 spin_lock_bh(&vsock_table_lock);
265 __vsock_insert_bound(vsock_unbound_sockets, vsk);
266 spin_unlock_bh(&vsock_table_lock);
269 void vsock_insert_connected(struct vsock_sock *vsk)
271 struct list_head *list = vsock_connected_sockets(
272 &vsk->remote_addr, &vsk->local_addr);
274 spin_lock_bh(&vsock_table_lock);
275 __vsock_insert_connected(list, vsk);
276 spin_unlock_bh(&vsock_table_lock);
278 EXPORT_SYMBOL_GPL(vsock_insert_connected);
280 void vsock_remove_bound(struct vsock_sock *vsk)
282 spin_lock_bh(&vsock_table_lock);
283 if (__vsock_in_bound_table(vsk))
284 __vsock_remove_bound(vsk);
285 spin_unlock_bh(&vsock_table_lock);
287 EXPORT_SYMBOL_GPL(vsock_remove_bound);
289 void vsock_remove_connected(struct vsock_sock *vsk)
291 spin_lock_bh(&vsock_table_lock);
292 if (__vsock_in_connected_table(vsk))
293 __vsock_remove_connected(vsk);
294 spin_unlock_bh(&vsock_table_lock);
296 EXPORT_SYMBOL_GPL(vsock_remove_connected);
298 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
302 spin_lock_bh(&vsock_table_lock);
303 sk = __vsock_find_bound_socket(addr);
307 spin_unlock_bh(&vsock_table_lock);
311 EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
313 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
314 struct sockaddr_vm *dst)
318 spin_lock_bh(&vsock_table_lock);
319 sk = __vsock_find_connected_socket(src, dst);
323 spin_unlock_bh(&vsock_table_lock);
327 EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
329 void vsock_remove_sock(struct vsock_sock *vsk)
331 vsock_remove_bound(vsk);
332 vsock_remove_connected(vsk);
334 EXPORT_SYMBOL_GPL(vsock_remove_sock);
336 void vsock_for_each_connected_socket(void (*fn)(struct sock *sk))
340 spin_lock_bh(&vsock_table_lock);
342 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) {
343 struct vsock_sock *vsk;
344 list_for_each_entry(vsk, &vsock_connected_table[i],
349 spin_unlock_bh(&vsock_table_lock);
351 EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket);
353 void vsock_add_pending(struct sock *listener, struct sock *pending)
355 struct vsock_sock *vlistener;
356 struct vsock_sock *vpending;
358 vlistener = vsock_sk(listener);
359 vpending = vsock_sk(pending);
363 list_add_tail(&vpending->pending_links, &vlistener->pending_links);
365 EXPORT_SYMBOL_GPL(vsock_add_pending);
367 void vsock_remove_pending(struct sock *listener, struct sock *pending)
369 struct vsock_sock *vpending = vsock_sk(pending);
371 list_del_init(&vpending->pending_links);
375 EXPORT_SYMBOL_GPL(vsock_remove_pending);
377 void vsock_enqueue_accept(struct sock *listener, struct sock *connected)
379 struct vsock_sock *vlistener;
380 struct vsock_sock *vconnected;
382 vlistener = vsock_sk(listener);
383 vconnected = vsock_sk(connected);
385 sock_hold(connected);
387 list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue);
389 EXPORT_SYMBOL_GPL(vsock_enqueue_accept);
391 static bool vsock_use_local_transport(unsigned int remote_cid)
393 if (!transport_local)
396 if (remote_cid == VMADDR_CID_LOCAL)
400 return remote_cid == transport_g2h->get_local_cid();
402 return remote_cid == VMADDR_CID_HOST;
406 static void vsock_deassign_transport(struct vsock_sock *vsk)
411 vsk->transport->destruct(vsk);
412 module_put(vsk->transport->module);
413 vsk->transport = NULL;
416 /* Assign a transport to a socket and call the .init transport callback.
418 * Note: for stream socket this must be called when vsk->remote_addr is set
419 * (e.g. during the connect() or when a connection request on a listener
420 * socket is received).
421 * The vsk->remote_addr is used to decide which transport to use:
422 * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if
423 * g2h is not loaded, will use local transport;
424 * - remote CID <= VMADDR_CID_HOST will use guest->host transport;
425 * - remote CID > VMADDR_CID_HOST will use host->guest transport;
427 int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
429 const struct vsock_transport *new_transport;
430 struct sock *sk = sk_vsock(vsk);
431 unsigned int remote_cid = vsk->remote_addr.svm_cid;
434 switch (sk->sk_type) {
436 new_transport = transport_dgram;
439 if (vsock_use_local_transport(remote_cid))
440 new_transport = transport_local;
441 else if (remote_cid <= VMADDR_CID_HOST)
442 new_transport = transport_g2h;
444 new_transport = transport_h2g;
447 return -ESOCKTNOSUPPORT;
450 if (vsk->transport) {
451 if (vsk->transport == new_transport)
454 vsk->transport->release(vsk);
455 vsock_deassign_transport(vsk);
458 /* We increase the module refcnt to prevent the transport unloading
459 * while there are open sockets assigned to it.
461 if (!new_transport || !try_module_get(new_transport->module))
464 ret = new_transport->init(vsk, psk);
466 module_put(new_transport->module);
470 vsk->transport = new_transport;
474 EXPORT_SYMBOL_GPL(vsock_assign_transport);
476 bool vsock_find_cid(unsigned int cid)
478 if (transport_g2h && cid == transport_g2h->get_local_cid())
481 if (transport_h2g && cid == VMADDR_CID_HOST)
484 if (transport_local && cid == VMADDR_CID_LOCAL)
489 EXPORT_SYMBOL_GPL(vsock_find_cid);
491 static struct sock *vsock_dequeue_accept(struct sock *listener)
493 struct vsock_sock *vlistener;
494 struct vsock_sock *vconnected;
496 vlistener = vsock_sk(listener);
498 if (list_empty(&vlistener->accept_queue))
501 vconnected = list_entry(vlistener->accept_queue.next,
502 struct vsock_sock, accept_queue);
504 list_del_init(&vconnected->accept_queue);
506 /* The caller will need a reference on the connected socket so we let
507 * it call sock_put().
510 return sk_vsock(vconnected);
513 static bool vsock_is_accept_queue_empty(struct sock *sk)
515 struct vsock_sock *vsk = vsock_sk(sk);
516 return list_empty(&vsk->accept_queue);
519 static bool vsock_is_pending(struct sock *sk)
521 struct vsock_sock *vsk = vsock_sk(sk);
522 return !list_empty(&vsk->pending_links);
525 static int vsock_send_shutdown(struct sock *sk, int mode)
527 struct vsock_sock *vsk = vsock_sk(sk);
532 return vsk->transport->shutdown(vsk, mode);
535 static void vsock_pending_work(struct work_struct *work)
538 struct sock *listener;
539 struct vsock_sock *vsk;
542 vsk = container_of(work, struct vsock_sock, pending_work.work);
544 listener = vsk->listener;
548 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
550 if (vsock_is_pending(sk)) {
551 vsock_remove_pending(listener, sk);
553 sk_acceptq_removed(listener);
554 } else if (!vsk->rejected) {
555 /* We are not on the pending list and accept() did not reject
556 * us, so we must have been accepted by our user process. We
557 * just need to drop our references to the sockets and be on
564 /* We need to remove ourself from the global connected sockets list so
565 * incoming packets can't find this socket, and to reduce the reference
568 vsock_remove_connected(vsk);
570 sk->sk_state = TCP_CLOSE;
574 release_sock(listener);
582 /**** SOCKET OPERATIONS ****/
584 static int __vsock_bind_stream(struct vsock_sock *vsk,
585 struct sockaddr_vm *addr)
588 struct sockaddr_vm new_addr;
591 port = LAST_RESERVED_PORT + 1 +
592 prandom_u32_max(U32_MAX - LAST_RESERVED_PORT);
594 vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
596 if (addr->svm_port == VMADDR_PORT_ANY) {
600 for (i = 0; i < MAX_PORT_RETRIES; i++) {
601 if (port <= LAST_RESERVED_PORT)
602 port = LAST_RESERVED_PORT + 1;
604 new_addr.svm_port = port++;
606 if (!__vsock_find_bound_socket(&new_addr)) {
613 return -EADDRNOTAVAIL;
615 /* If port is in reserved range, ensure caller
616 * has necessary privileges.
618 if (addr->svm_port <= LAST_RESERVED_PORT &&
619 !capable(CAP_NET_BIND_SERVICE)) {
623 if (__vsock_find_bound_socket(&new_addr))
627 vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
629 /* Remove stream sockets from the unbound list and add them to the hash
630 * table for easy lookup by its address. The unbound list is simply an
631 * extra entry at the end of the hash table, a trick used by AF_UNIX.
633 __vsock_remove_bound(vsk);
634 __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk);
639 static int __vsock_bind_dgram(struct vsock_sock *vsk,
640 struct sockaddr_vm *addr)
642 return vsk->transport->dgram_bind(vsk, addr);
645 static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
647 struct vsock_sock *vsk = vsock_sk(sk);
650 /* First ensure this socket isn't already bound. */
651 if (vsock_addr_bound(&vsk->local_addr))
654 /* Now bind to the provided address or select appropriate values if
655 * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that
656 * like AF_INET prevents binding to a non-local IP address (in most
657 * cases), we only allow binding to a local CID.
659 if (addr->svm_cid != VMADDR_CID_ANY && !vsock_find_cid(addr->svm_cid))
660 return -EADDRNOTAVAIL;
662 switch (sk->sk_socket->type) {
664 spin_lock_bh(&vsock_table_lock);
665 retval = __vsock_bind_stream(vsk, addr);
666 spin_unlock_bh(&vsock_table_lock);
670 retval = __vsock_bind_dgram(vsk, addr);
681 static void vsock_connect_timeout(struct work_struct *work);
683 static struct sock *__vsock_create(struct net *net,
691 struct vsock_sock *psk;
692 struct vsock_sock *vsk;
694 sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern);
698 sock_init_data(sock, sk);
700 /* sk->sk_type is normally set in sock_init_data, but only if sock is
701 * non-NULL. We make sure that our sockets always have a type by
702 * setting it here if needed.
708 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
709 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
711 sk->sk_destruct = vsock_sk_destruct;
712 sk->sk_backlog_rcv = vsock_queue_rcv_skb;
713 sock_reset_flag(sk, SOCK_DONE);
715 INIT_LIST_HEAD(&vsk->bound_table);
716 INIT_LIST_HEAD(&vsk->connected_table);
717 vsk->listener = NULL;
718 INIT_LIST_HEAD(&vsk->pending_links);
719 INIT_LIST_HEAD(&vsk->accept_queue);
720 vsk->rejected = false;
721 vsk->sent_request = false;
722 vsk->ignore_connecting_rst = false;
723 vsk->peer_shutdown = 0;
724 INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout);
725 INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work);
727 psk = parent ? vsock_sk(parent) : NULL;
729 vsk->trusted = psk->trusted;
730 vsk->owner = get_cred(psk->owner);
731 vsk->connect_timeout = psk->connect_timeout;
732 vsk->buffer_size = psk->buffer_size;
733 vsk->buffer_min_size = psk->buffer_min_size;
734 vsk->buffer_max_size = psk->buffer_max_size;
736 vsk->trusted = capable(CAP_NET_ADMIN);
737 vsk->owner = get_current_cred();
738 vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT;
739 vsk->buffer_size = VSOCK_DEFAULT_BUFFER_SIZE;
740 vsk->buffer_min_size = VSOCK_DEFAULT_BUFFER_MIN_SIZE;
741 vsk->buffer_max_size = VSOCK_DEFAULT_BUFFER_MAX_SIZE;
747 static void __vsock_release(struct sock *sk, int level)
750 struct sock *pending;
751 struct vsock_sock *vsk;
754 pending = NULL; /* Compiler warning. */
756 /* The release call is supposed to use lock_sock_nested()
757 * rather than lock_sock(), if a sock lock should be acquired.
760 vsk->transport->release(vsk);
761 else if (sk->sk_type == SOCK_STREAM)
762 vsock_remove_sock(vsk);
764 /* When "level" is SINGLE_DEPTH_NESTING, use the nested
765 * version to avoid the warning "possible recursive locking
766 * detected". When "level" is 0, lock_sock_nested(sk, level)
767 * is the same as lock_sock(sk).
769 lock_sock_nested(sk, level);
771 sk->sk_shutdown = SHUTDOWN_MASK;
773 skb_queue_purge(&sk->sk_receive_queue);
775 /* Clean up any sockets that never were accepted. */
776 while ((pending = vsock_dequeue_accept(sk)) != NULL) {
777 __vsock_release(pending, SINGLE_DEPTH_NESTING);
786 static void vsock_sk_destruct(struct sock *sk)
788 struct vsock_sock *vsk = vsock_sk(sk);
790 vsock_deassign_transport(vsk);
792 /* When clearing these addresses, there's no need to set the family and
793 * possibly register the address family with the kernel.
795 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
796 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
798 put_cred(vsk->owner);
801 static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
805 err = sock_queue_rcv_skb(sk, skb);
812 struct sock *vsock_create_connected(struct sock *parent)
814 return __vsock_create(sock_net(parent), NULL, parent, GFP_KERNEL,
817 EXPORT_SYMBOL_GPL(vsock_create_connected);
819 s64 vsock_stream_has_data(struct vsock_sock *vsk)
821 return vsk->transport->stream_has_data(vsk);
823 EXPORT_SYMBOL_GPL(vsock_stream_has_data);
825 s64 vsock_stream_has_space(struct vsock_sock *vsk)
827 return vsk->transport->stream_has_space(vsk);
829 EXPORT_SYMBOL_GPL(vsock_stream_has_space);
831 static int vsock_release(struct socket *sock)
833 __vsock_release(sock->sk, 0);
835 sock->state = SS_FREE;
841 vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
845 struct sockaddr_vm *vm_addr;
849 if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0)
853 err = __vsock_bind(sk, vm_addr);
859 static int vsock_getname(struct socket *sock,
860 struct sockaddr *addr, int peer)
864 struct vsock_sock *vsk;
865 struct sockaddr_vm *vm_addr;
874 if (sock->state != SS_CONNECTED) {
878 vm_addr = &vsk->remote_addr;
880 vm_addr = &vsk->local_addr;
888 /* sys_getsockname() and sys_getpeername() pass us a
889 * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately
890 * that macro is defined in socket.c instead of .h, so we hardcode its
893 BUILD_BUG_ON(sizeof(*vm_addr) > 128);
894 memcpy(addr, vm_addr, sizeof(*vm_addr));
895 err = sizeof(*vm_addr);
902 static int vsock_shutdown(struct socket *sock, int mode)
907 /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses
908 * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode
909 * here like the other address families do. Note also that the
910 * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3),
911 * which is what we want.
915 if ((mode & ~SHUTDOWN_MASK) || !mode)
918 /* If this is a STREAM socket and it is not connected then bail out
919 * immediately. If it is a DGRAM socket then we must first kick the
920 * socket so that it wakes up from any sleeping calls, for example
921 * recv(), and then afterwards return the error.
925 if (sock->state == SS_UNCONNECTED) {
927 if (sk->sk_type == SOCK_STREAM)
930 sock->state = SS_DISCONNECTING;
934 /* Receive and send shutdowns are treated alike. */
935 mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN);
938 sk->sk_shutdown |= mode;
939 sk->sk_state_change(sk);
942 if (sk->sk_type == SOCK_STREAM) {
943 sock_reset_flag(sk, SOCK_DONE);
944 vsock_send_shutdown(sk, mode);
951 static __poll_t vsock_poll(struct file *file, struct socket *sock,
956 struct vsock_sock *vsk;
961 poll_wait(file, sk_sleep(sk), wait);
965 /* Signify that there has been an error on this socket. */
968 /* INET sockets treat local write shutdown and peer write shutdown as a
969 * case of EPOLLHUP set.
971 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
972 ((sk->sk_shutdown & SEND_SHUTDOWN) &&
973 (vsk->peer_shutdown & SEND_SHUTDOWN))) {
977 if (sk->sk_shutdown & RCV_SHUTDOWN ||
978 vsk->peer_shutdown & SEND_SHUTDOWN) {
982 if (sock->type == SOCK_DGRAM) {
983 /* For datagram sockets we can read if there is something in
984 * the queue and write as long as the socket isn't shutdown for
987 if (!skb_queue_empty_lockless(&sk->sk_receive_queue) ||
988 (sk->sk_shutdown & RCV_SHUTDOWN)) {
989 mask |= EPOLLIN | EPOLLRDNORM;
992 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
993 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
995 } else if (sock->type == SOCK_STREAM) {
996 const struct vsock_transport *transport = vsk->transport;
999 /* Listening sockets that have connections in their accept
1000 * queue can be read.
1002 if (sk->sk_state == TCP_LISTEN
1003 && !vsock_is_accept_queue_empty(sk))
1004 mask |= EPOLLIN | EPOLLRDNORM;
1006 /* If there is something in the queue then we can read. */
1007 if (transport && transport->stream_is_active(vsk) &&
1008 !(sk->sk_shutdown & RCV_SHUTDOWN)) {
1009 bool data_ready_now = false;
1010 int ret = transport->notify_poll_in(
1011 vsk, 1, &data_ready_now);
1016 mask |= EPOLLIN | EPOLLRDNORM;
1021 /* Sockets whose connections have been closed, reset, or
1022 * terminated should also be considered read, and we check the
1023 * shutdown flag for that.
1025 if (sk->sk_shutdown & RCV_SHUTDOWN ||
1026 vsk->peer_shutdown & SEND_SHUTDOWN) {
1027 mask |= EPOLLIN | EPOLLRDNORM;
1030 /* Connected sockets that can produce data can be written. */
1031 if (sk->sk_state == TCP_ESTABLISHED) {
1032 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
1033 bool space_avail_now = false;
1034 int ret = transport->notify_poll_out(
1035 vsk, 1, &space_avail_now);
1039 if (space_avail_now)
1040 /* Remove EPOLLWRBAND since INET
1041 * sockets are not setting it.
1043 mask |= EPOLLOUT | EPOLLWRNORM;
1049 /* Simulate INET socket poll behaviors, which sets
1050 * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read,
1051 * but local send is not shutdown.
1053 if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) {
1054 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
1055 mask |= EPOLLOUT | EPOLLWRNORM;
1065 static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
1070 struct vsock_sock *vsk;
1071 struct sockaddr_vm *remote_addr;
1072 const struct vsock_transport *transport;
1074 if (msg->msg_flags & MSG_OOB)
1077 /* For now, MSG_DONTWAIT is always assumed... */
1081 transport = vsk->transport;
1085 err = vsock_auto_bind(vsk);
1090 /* If the provided message contains an address, use that. Otherwise
1091 * fall back on the socket's remote handle (if it has been connected).
1093 if (msg->msg_name &&
1094 vsock_addr_cast(msg->msg_name, msg->msg_namelen,
1095 &remote_addr) == 0) {
1096 /* Ensure this address is of the right type and is a valid
1100 if (remote_addr->svm_cid == VMADDR_CID_ANY)
1101 remote_addr->svm_cid = transport->get_local_cid();
1103 if (!vsock_addr_bound(remote_addr)) {
1107 } else if (sock->state == SS_CONNECTED) {
1108 remote_addr = &vsk->remote_addr;
1110 if (remote_addr->svm_cid == VMADDR_CID_ANY)
1111 remote_addr->svm_cid = transport->get_local_cid();
1113 /* XXX Should connect() or this function ensure remote_addr is
1116 if (!vsock_addr_bound(&vsk->remote_addr)) {
1125 if (!transport->dgram_allow(remote_addr->svm_cid,
1126 remote_addr->svm_port)) {
1131 err = transport->dgram_enqueue(vsk, remote_addr, msg, len);
1138 static int vsock_dgram_connect(struct socket *sock,
1139 struct sockaddr *addr, int addr_len, int flags)
1143 struct vsock_sock *vsk;
1144 struct sockaddr_vm *remote_addr;
1149 err = vsock_addr_cast(addr, addr_len, &remote_addr);
1150 if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) {
1152 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY,
1154 sock->state = SS_UNCONNECTED;
1157 } else if (err != 0)
1162 err = vsock_auto_bind(vsk);
1166 if (!vsk->transport->dgram_allow(remote_addr->svm_cid,
1167 remote_addr->svm_port)) {
1172 memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr));
1173 sock->state = SS_CONNECTED;
1180 static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
1181 size_t len, int flags)
1183 struct vsock_sock *vsk = vsock_sk(sock->sk);
1185 return vsk->transport->dgram_dequeue(vsk, msg, len, flags);
1188 static const struct proto_ops vsock_dgram_ops = {
1190 .owner = THIS_MODULE,
1191 .release = vsock_release,
1193 .connect = vsock_dgram_connect,
1194 .socketpair = sock_no_socketpair,
1195 .accept = sock_no_accept,
1196 .getname = vsock_getname,
1198 .ioctl = sock_no_ioctl,
1199 .listen = sock_no_listen,
1200 .shutdown = vsock_shutdown,
1201 .setsockopt = sock_no_setsockopt,
1202 .getsockopt = sock_no_getsockopt,
1203 .sendmsg = vsock_dgram_sendmsg,
1204 .recvmsg = vsock_dgram_recvmsg,
1205 .mmap = sock_no_mmap,
1206 .sendpage = sock_no_sendpage,
1209 static int vsock_transport_cancel_pkt(struct vsock_sock *vsk)
1211 const struct vsock_transport *transport = vsk->transport;
1213 if (!transport->cancel_pkt)
1216 return transport->cancel_pkt(vsk);
1219 static void vsock_connect_timeout(struct work_struct *work)
1222 struct vsock_sock *vsk;
1225 vsk = container_of(work, struct vsock_sock, connect_work.work);
1229 if (sk->sk_state == TCP_SYN_SENT &&
1230 (sk->sk_shutdown != SHUTDOWN_MASK)) {
1231 sk->sk_state = TCP_CLOSE;
1232 sk->sk_err = ETIMEDOUT;
1233 sk->sk_error_report(sk);
1238 vsock_transport_cancel_pkt(vsk);
1243 static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
1244 int addr_len, int flags)
1248 struct vsock_sock *vsk;
1249 const struct vsock_transport *transport;
1250 struct sockaddr_vm *remote_addr;
1260 /* XXX AF_UNSPEC should make us disconnect like AF_INET. */
1261 switch (sock->state) {
1265 case SS_DISCONNECTING:
1269 /* This continues on so we can move sock into the SS_CONNECTED
1270 * state once the connection has completed (at which point err
1271 * will be set to zero also). Otherwise, we will either wait
1272 * for the connection or return -EALREADY should this be a
1273 * non-blocking call.
1278 if ((sk->sk_state == TCP_LISTEN) ||
1279 vsock_addr_cast(addr, addr_len, &remote_addr) != 0) {
1284 /* Set the remote address that we are connecting to. */
1285 memcpy(&vsk->remote_addr, remote_addr,
1286 sizeof(vsk->remote_addr));
1288 err = vsock_assign_transport(vsk, NULL);
1292 transport = vsk->transport;
1294 /* The hypervisor and well-known contexts do not have socket
1298 !transport->stream_allow(remote_addr->svm_cid,
1299 remote_addr->svm_port)) {
1304 err = vsock_auto_bind(vsk);
1308 sk->sk_state = TCP_SYN_SENT;
1310 err = transport->connect(vsk);
1314 /* Mark sock as connecting and set the error code to in
1315 * progress in case this is a non-blocking connect.
1317 sock->state = SS_CONNECTING;
1321 /* The receive path will handle all communication until we are able to
1322 * enter the connected state. Here we wait for the connection to be
1323 * completed or a notification of an error.
1325 timeout = vsk->connect_timeout;
1326 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1328 while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) {
1329 if (flags & O_NONBLOCK) {
1330 /* If we're not going to block, we schedule a timeout
1331 * function to generate a timeout on the connection
1332 * attempt, in case the peer doesn't respond in a
1333 * timely manner. We hold on to the socket until the
1337 schedule_delayed_work(&vsk->connect_work, timeout);
1339 /* Skip ahead to preserve error code set above. */
1344 timeout = schedule_timeout(timeout);
1347 if (signal_pending(current)) {
1348 err = sock_intr_errno(timeout);
1349 sk->sk_state = TCP_CLOSE;
1350 sock->state = SS_UNCONNECTED;
1351 vsock_transport_cancel_pkt(vsk);
1353 } else if (timeout == 0) {
1355 sk->sk_state = TCP_CLOSE;
1356 sock->state = SS_UNCONNECTED;
1357 vsock_transport_cancel_pkt(vsk);
1361 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1366 sk->sk_state = TCP_CLOSE;
1367 sock->state = SS_UNCONNECTED;
1373 finish_wait(sk_sleep(sk), &wait);
1379 static int vsock_accept(struct socket *sock, struct socket *newsock, int flags,
1382 struct sock *listener;
1384 struct sock *connected;
1385 struct vsock_sock *vconnected;
1390 listener = sock->sk;
1392 lock_sock(listener);
1394 if (sock->type != SOCK_STREAM) {
1399 if (listener->sk_state != TCP_LISTEN) {
1404 /* Wait for children sockets to appear; these are the new sockets
1405 * created upon connection establishment.
1407 timeout = sock_sndtimeo(listener, flags & O_NONBLOCK);
1408 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1410 while ((connected = vsock_dequeue_accept(listener)) == NULL &&
1411 listener->sk_err == 0) {
1412 release_sock(listener);
1413 timeout = schedule_timeout(timeout);
1414 finish_wait(sk_sleep(listener), &wait);
1415 lock_sock(listener);
1417 if (signal_pending(current)) {
1418 err = sock_intr_errno(timeout);
1420 } else if (timeout == 0) {
1425 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1427 finish_wait(sk_sleep(listener), &wait);
1429 if (listener->sk_err)
1430 err = -listener->sk_err;
1433 sk_acceptq_removed(listener);
1435 lock_sock_nested(connected, SINGLE_DEPTH_NESTING);
1436 vconnected = vsock_sk(connected);
1438 /* If the listener socket has received an error, then we should
1439 * reject this socket and return. Note that we simply mark the
1440 * socket rejected, drop our reference, and let the cleanup
1441 * function handle the cleanup; the fact that we found it in
1442 * the listener's accept queue guarantees that the cleanup
1443 * function hasn't run yet.
1446 vconnected->rejected = true;
1448 newsock->state = SS_CONNECTED;
1449 sock_graft(connected, newsock);
1452 release_sock(connected);
1453 sock_put(connected);
1457 release_sock(listener);
1461 static int vsock_listen(struct socket *sock, int backlog)
1465 struct vsock_sock *vsk;
1471 if (sock->type != SOCK_STREAM) {
1476 if (sock->state != SS_UNCONNECTED) {
1483 if (!vsock_addr_bound(&vsk->local_addr)) {
1488 sk->sk_max_ack_backlog = backlog;
1489 sk->sk_state = TCP_LISTEN;
1498 static void vsock_update_buffer_size(struct vsock_sock *vsk,
1499 const struct vsock_transport *transport,
1502 if (val > vsk->buffer_max_size)
1503 val = vsk->buffer_max_size;
1505 if (val < vsk->buffer_min_size)
1506 val = vsk->buffer_min_size;
1508 if (val != vsk->buffer_size &&
1509 transport && transport->notify_buffer_size)
1510 transport->notify_buffer_size(vsk, &val);
1512 vsk->buffer_size = val;
1515 static int vsock_stream_setsockopt(struct socket *sock,
1518 char __user *optval,
1519 unsigned int optlen)
1523 struct vsock_sock *vsk;
1524 const struct vsock_transport *transport;
1527 if (level != AF_VSOCK)
1528 return -ENOPROTOOPT;
1530 #define COPY_IN(_v) \
1532 if (optlen < sizeof(_v)) { \
1536 if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \
1545 transport = vsk->transport;
1550 case SO_VM_SOCKETS_BUFFER_SIZE:
1552 vsock_update_buffer_size(vsk, transport, val);
1555 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1557 vsk->buffer_max_size = val;
1558 vsock_update_buffer_size(vsk, transport, vsk->buffer_size);
1561 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1563 vsk->buffer_min_size = val;
1564 vsock_update_buffer_size(vsk, transport, vsk->buffer_size);
1567 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1568 struct __kernel_old_timeval tv;
1570 if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC &&
1571 tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) {
1572 vsk->connect_timeout = tv.tv_sec * HZ +
1573 DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ));
1574 if (vsk->connect_timeout == 0)
1575 vsk->connect_timeout =
1576 VSOCK_DEFAULT_CONNECT_TIMEOUT;
1596 static int vsock_stream_getsockopt(struct socket *sock,
1597 int level, int optname,
1598 char __user *optval,
1604 struct vsock_sock *vsk;
1607 if (level != AF_VSOCK)
1608 return -ENOPROTOOPT;
1610 err = get_user(len, optlen);
1614 #define COPY_OUT(_v) \
1616 if (len < sizeof(_v)) \
1620 if (copy_to_user(optval, &_v, len) != 0) \
1630 case SO_VM_SOCKETS_BUFFER_SIZE:
1631 val = vsk->buffer_size;
1635 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1636 val = vsk->buffer_max_size;
1640 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1641 val = vsk->buffer_min_size;
1645 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1646 struct __kernel_old_timeval tv;
1647 tv.tv_sec = vsk->connect_timeout / HZ;
1649 (vsk->connect_timeout -
1650 tv.tv_sec * HZ) * (1000000 / HZ);
1655 return -ENOPROTOOPT;
1658 err = put_user(len, optlen);
1667 static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
1671 struct vsock_sock *vsk;
1672 const struct vsock_transport *transport;
1673 ssize_t total_written;
1676 struct vsock_transport_send_notify_data send_data;
1677 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1681 transport = vsk->transport;
1685 if (msg->msg_flags & MSG_OOB)
1690 /* Callers should not provide a destination with stream sockets. */
1691 if (msg->msg_namelen) {
1692 err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP;
1696 /* Send data only if both sides are not shutdown in the direction. */
1697 if (sk->sk_shutdown & SEND_SHUTDOWN ||
1698 vsk->peer_shutdown & RCV_SHUTDOWN) {
1703 if (!transport || sk->sk_state != TCP_ESTABLISHED ||
1704 !vsock_addr_bound(&vsk->local_addr)) {
1709 if (!vsock_addr_bound(&vsk->remote_addr)) {
1710 err = -EDESTADDRREQ;
1714 /* Wait for room in the produce queue to enqueue our user's data. */
1715 timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1717 err = transport->notify_send_init(vsk, &send_data);
1721 while (total_written < len) {
1724 add_wait_queue(sk_sleep(sk), &wait);
1725 while (vsock_stream_has_space(vsk) == 0 &&
1727 !(sk->sk_shutdown & SEND_SHUTDOWN) &&
1728 !(vsk->peer_shutdown & RCV_SHUTDOWN)) {
1730 /* Don't wait for non-blocking sockets. */
1733 remove_wait_queue(sk_sleep(sk), &wait);
1737 err = transport->notify_send_pre_block(vsk, &send_data);
1739 remove_wait_queue(sk_sleep(sk), &wait);
1744 timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout);
1746 if (signal_pending(current)) {
1747 err = sock_intr_errno(timeout);
1748 remove_wait_queue(sk_sleep(sk), &wait);
1750 } else if (timeout == 0) {
1752 remove_wait_queue(sk_sleep(sk), &wait);
1756 remove_wait_queue(sk_sleep(sk), &wait);
1758 /* These checks occur both as part of and after the loop
1759 * conditional since we need to check before and after
1765 } else if ((sk->sk_shutdown & SEND_SHUTDOWN) ||
1766 (vsk->peer_shutdown & RCV_SHUTDOWN)) {
1771 err = transport->notify_send_pre_enqueue(vsk, &send_data);
1775 /* Note that enqueue will only write as many bytes as are free
1776 * in the produce queue, so we don't need to ensure len is
1777 * smaller than the queue size. It is the caller's
1778 * responsibility to check how many bytes we were able to send.
1781 written = transport->stream_enqueue(
1783 len - total_written);
1789 total_written += written;
1791 err = transport->notify_send_post_enqueue(
1792 vsk, written, &send_data);
1799 if (total_written > 0)
1800 err = total_written;
1808 vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1812 struct vsock_sock *vsk;
1813 const struct vsock_transport *transport;
1818 struct vsock_transport_recv_notify_data recv_data;
1824 transport = vsk->transport;
1829 if (!transport || sk->sk_state != TCP_ESTABLISHED) {
1830 /* Recvmsg is supposed to return 0 if a peer performs an
1831 * orderly shutdown. Differentiate between that case and when a
1832 * peer has not connected or a local shutdown occured with the
1835 if (sock_flag(sk, SOCK_DONE))
1843 if (flags & MSG_OOB) {
1848 /* We don't check peer_shutdown flag here since peer may actually shut
1849 * down, but there can be data in the queue that a local socket can
1852 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1857 /* It is valid on Linux to pass in a zero-length receive buffer. This
1858 * is not an error. We may as well bail out now.
1865 /* We must not copy less than target bytes into the user's buffer
1866 * before returning successfully, so we wait for the consume queue to
1867 * have that much data to consume before dequeueing. Note that this
1868 * makes it impossible to handle cases where target is greater than the
1871 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1872 if (target >= transport->stream_rcvhiwat(vsk)) {
1876 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1879 err = transport->notify_recv_init(vsk, target, &recv_data);
1887 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1888 ready = vsock_stream_has_data(vsk);
1891 if (sk->sk_err != 0 ||
1892 (sk->sk_shutdown & RCV_SHUTDOWN) ||
1893 (vsk->peer_shutdown & SEND_SHUTDOWN)) {
1894 finish_wait(sk_sleep(sk), &wait);
1897 /* Don't wait for non-blocking sockets. */
1900 finish_wait(sk_sleep(sk), &wait);
1904 err = transport->notify_recv_pre_block(
1905 vsk, target, &recv_data);
1907 finish_wait(sk_sleep(sk), &wait);
1911 timeout = schedule_timeout(timeout);
1914 if (signal_pending(current)) {
1915 err = sock_intr_errno(timeout);
1916 finish_wait(sk_sleep(sk), &wait);
1918 } else if (timeout == 0) {
1920 finish_wait(sk_sleep(sk), &wait);
1926 finish_wait(sk_sleep(sk), &wait);
1929 /* Invalid queue pair content. XXX This should
1930 * be changed to a connection reset in a later
1938 err = transport->notify_recv_pre_dequeue(
1939 vsk, target, &recv_data);
1943 read = transport->stream_dequeue(
1945 len - copied, flags);
1953 err = transport->notify_recv_post_dequeue(
1955 !(flags & MSG_PEEK), &recv_data);
1959 if (read >= target || flags & MSG_PEEK)
1968 else if (sk->sk_shutdown & RCV_SHUTDOWN)
1979 static const struct proto_ops vsock_stream_ops = {
1981 .owner = THIS_MODULE,
1982 .release = vsock_release,
1984 .connect = vsock_stream_connect,
1985 .socketpair = sock_no_socketpair,
1986 .accept = vsock_accept,
1987 .getname = vsock_getname,
1989 .ioctl = sock_no_ioctl,
1990 .listen = vsock_listen,
1991 .shutdown = vsock_shutdown,
1992 .setsockopt = vsock_stream_setsockopt,
1993 .getsockopt = vsock_stream_getsockopt,
1994 .sendmsg = vsock_stream_sendmsg,
1995 .recvmsg = vsock_stream_recvmsg,
1996 .mmap = sock_no_mmap,
1997 .sendpage = sock_no_sendpage,
2000 static int vsock_create(struct net *net, struct socket *sock,
2001 int protocol, int kern)
2003 struct vsock_sock *vsk;
2010 if (protocol && protocol != PF_VSOCK)
2011 return -EPROTONOSUPPORT;
2013 switch (sock->type) {
2015 sock->ops = &vsock_dgram_ops;
2018 sock->ops = &vsock_stream_ops;
2021 return -ESOCKTNOSUPPORT;
2024 sock->state = SS_UNCONNECTED;
2026 sk = __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern);
2032 if (sock->type == SOCK_DGRAM) {
2033 ret = vsock_assign_transport(vsk, NULL);
2040 vsock_insert_unbound(vsk);
2045 static const struct net_proto_family vsock_family_ops = {
2047 .create = vsock_create,
2048 .owner = THIS_MODULE,
2051 static long vsock_dev_do_ioctl(struct file *filp,
2052 unsigned int cmd, void __user *ptr)
2054 u32 __user *p = ptr;
2055 u32 cid = VMADDR_CID_ANY;
2059 case IOCTL_VM_SOCKETS_GET_LOCAL_CID:
2060 /* To be compatible with the VMCI behavior, we prioritize the
2061 * guest CID instead of well-know host CID (VMADDR_CID_HOST).
2064 cid = transport_g2h->get_local_cid();
2065 else if (transport_h2g)
2066 cid = transport_h2g->get_local_cid();
2068 if (put_user(cid, p) != 0)
2073 pr_err("Unknown ioctl %d\n", cmd);
2080 static long vsock_dev_ioctl(struct file *filp,
2081 unsigned int cmd, unsigned long arg)
2083 return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg);
2086 #ifdef CONFIG_COMPAT
2087 static long vsock_dev_compat_ioctl(struct file *filp,
2088 unsigned int cmd, unsigned long arg)
2090 return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg));
2094 static const struct file_operations vsock_device_ops = {
2095 .owner = THIS_MODULE,
2096 .unlocked_ioctl = vsock_dev_ioctl,
2097 #ifdef CONFIG_COMPAT
2098 .compat_ioctl = vsock_dev_compat_ioctl,
2100 .open = nonseekable_open,
2103 static struct miscdevice vsock_device = {
2105 .fops = &vsock_device_ops,
2108 static int __init vsock_init(void)
2112 vsock_init_tables();
2114 vsock_proto.owner = THIS_MODULE;
2115 vsock_device.minor = MISC_DYNAMIC_MINOR;
2116 err = misc_register(&vsock_device);
2118 pr_err("Failed to register misc device\n");
2119 goto err_reset_transport;
2122 err = proto_register(&vsock_proto, 1); /* we want our slab */
2124 pr_err("Cannot register vsock protocol\n");
2125 goto err_deregister_misc;
2128 err = sock_register(&vsock_family_ops);
2130 pr_err("could not register af_vsock (%d) address family: %d\n",
2132 goto err_unregister_proto;
2137 err_unregister_proto:
2138 proto_unregister(&vsock_proto);
2139 err_deregister_misc:
2140 misc_deregister(&vsock_device);
2141 err_reset_transport:
2145 static void __exit vsock_exit(void)
2147 misc_deregister(&vsock_device);
2148 sock_unregister(AF_VSOCK);
2149 proto_unregister(&vsock_proto);
2152 const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk)
2154 return vsk->transport;
2156 EXPORT_SYMBOL_GPL(vsock_core_get_transport);
2158 int vsock_core_register(const struct vsock_transport *t, int features)
2160 const struct vsock_transport *t_h2g, *t_g2h, *t_dgram, *t_local;
2161 int err = mutex_lock_interruptible(&vsock_register_mutex);
2166 t_h2g = transport_h2g;
2167 t_g2h = transport_g2h;
2168 t_dgram = transport_dgram;
2169 t_local = transport_local;
2171 if (features & VSOCK_TRANSPORT_F_H2G) {
2179 if (features & VSOCK_TRANSPORT_F_G2H) {
2187 if (features & VSOCK_TRANSPORT_F_DGRAM) {
2195 if (features & VSOCK_TRANSPORT_F_LOCAL) {
2203 transport_h2g = t_h2g;
2204 transport_g2h = t_g2h;
2205 transport_dgram = t_dgram;
2206 transport_local = t_local;
2209 mutex_unlock(&vsock_register_mutex);
2212 EXPORT_SYMBOL_GPL(vsock_core_register);
2214 void vsock_core_unregister(const struct vsock_transport *t)
2216 mutex_lock(&vsock_register_mutex);
2218 if (transport_h2g == t)
2219 transport_h2g = NULL;
2221 if (transport_g2h == t)
2222 transport_g2h = NULL;
2224 if (transport_dgram == t)
2225 transport_dgram = NULL;
2227 if (transport_local == t)
2228 transport_local = NULL;
2230 mutex_unlock(&vsock_register_mutex);
2232 EXPORT_SYMBOL_GPL(vsock_core_unregister);
2234 module_init(vsock_init);
2235 module_exit(vsock_exit);
2237 MODULE_AUTHOR("VMware, Inc.");
2238 MODULE_DESCRIPTION("VMware Virtual Socket Family");
2239 MODULE_VERSION("1.0.2.0-k");
2240 MODULE_LICENSE("GPL v2");