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Andy Kingd021c342013-02-06 14:23:56 +00001/*
2 * VMware vSockets Driver
3 *
4 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved.
5 *
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.
9 *
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
13 * more details.
14 */
15
16/* Implementation notes:
17 *
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.
20 *
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.
33 *
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).
37 *
38 * - "Server" sockets are referred to as listener sockets throughout this
Stefan Hajnocziea3803c2015-10-29 11:57:42 +000039 * 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.
Andy Kingd021c342013-02-06 14:23:56 +000053 *
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.
63 *
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.
69 *
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.
77 */
78
79#include <linux/types.h>
Andy Kingd021c342013-02-06 14:23:56 +000080#include <linux/bitops.h>
81#include <linux/cred.h>
82#include <linux/init.h>
83#include <linux/io.h>
84#include <linux/kernel.h>
85#include <linux/kmod.h>
86#include <linux/list.h>
87#include <linux/miscdevice.h>
88#include <linux/module.h>
89#include <linux/mutex.h>
90#include <linux/net.h>
91#include <linux/poll.h>
92#include <linux/skbuff.h>
93#include <linux/smp.h>
94#include <linux/socket.h>
95#include <linux/stddef.h>
96#include <linux/unistd.h>
97#include <linux/wait.h>
98#include <linux/workqueue.h>
99#include <net/sock.h>
Asias He82a54d02013-07-25 17:39:34 +0800100#include <net/af_vsock.h>
Andy Kingd021c342013-02-06 14:23:56 +0000101
102static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
103static void vsock_sk_destruct(struct sock *sk);
104static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
105
106/* Protocol family. */
107static struct proto vsock_proto = {
108 .name = "AF_VSOCK",
109 .owner = THIS_MODULE,
110 .obj_size = sizeof(struct vsock_sock),
111};
112
113/* The default peer timeout indicates how long we will wait for a peer response
114 * to a control message.
115 */
116#define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ)
117
Andy Kingd021c342013-02-06 14:23:56 +0000118static const struct vsock_transport *transport;
119static DEFINE_MUTEX(vsock_register_mutex);
120
121/**** EXPORTS ****/
122
123/* Get the ID of the local context. This is transport dependent. */
124
125int vm_sockets_get_local_cid(void)
126{
127 return transport->get_local_cid();
128}
129EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid);
130
131/**** UTILS ****/
132
133/* Each bound VSocket is stored in the bind hash table and each connected
134 * VSocket is stored in the connected hash table.
135 *
136 * Unbound sockets are all put on the same list attached to the end of the hash
137 * table (vsock_unbound_sockets). Bound sockets are added to the hash table in
138 * the bucket that their local address hashes to (vsock_bound_sockets(addr)
139 * represents the list that addr hashes to).
140 *
141 * Specifically, we initialize the vsock_bind_table array to a size of
142 * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through
143 * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and
144 * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function
Asias Hea49dd9d2013-06-20 17:20:33 +0800145 * mods with VSOCK_HASH_SIZE to ensure this.
Andy Kingd021c342013-02-06 14:23:56 +0000146 */
147#define VSOCK_HASH_SIZE 251
148#define MAX_PORT_RETRIES 24
149
Asias Hea49dd9d2013-06-20 17:20:33 +0800150#define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE)
Andy Kingd021c342013-02-06 14:23:56 +0000151#define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)])
152#define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE])
153
154/* XXX This can probably be implemented in a better way. */
155#define VSOCK_CONN_HASH(src, dst) \
Asias Hea49dd9d2013-06-20 17:20:33 +0800156 (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE)
Andy Kingd021c342013-02-06 14:23:56 +0000157#define vsock_connected_sockets(src, dst) \
158 (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)])
159#define vsock_connected_sockets_vsk(vsk) \
160 vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr)
161
162static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
163static struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
164static DEFINE_SPINLOCK(vsock_table_lock);
165
Asias Heb3a6dfe2013-06-20 17:20:30 +0800166/* Autobind this socket to the local address if necessary. */
167static int vsock_auto_bind(struct vsock_sock *vsk)
168{
169 struct sock *sk = sk_vsock(vsk);
170 struct sockaddr_vm local_addr;
171
172 if (vsock_addr_bound(&vsk->local_addr))
173 return 0;
174 vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
175 return __vsock_bind(sk, &local_addr);
176}
177
Geert Uytterhoeven22ee3b52013-04-23 23:40:55 +0000178static void vsock_init_tables(void)
Andy Kingd021c342013-02-06 14:23:56 +0000179{
180 int i;
181
182 for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++)
183 INIT_LIST_HEAD(&vsock_bind_table[i]);
184
185 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++)
186 INIT_LIST_HEAD(&vsock_connected_table[i]);
187}
188
189static void __vsock_insert_bound(struct list_head *list,
190 struct vsock_sock *vsk)
191{
192 sock_hold(&vsk->sk);
193 list_add(&vsk->bound_table, list);
194}
195
196static void __vsock_insert_connected(struct list_head *list,
197 struct vsock_sock *vsk)
198{
199 sock_hold(&vsk->sk);
200 list_add(&vsk->connected_table, list);
201}
202
203static void __vsock_remove_bound(struct vsock_sock *vsk)
204{
205 list_del_init(&vsk->bound_table);
206 sock_put(&vsk->sk);
207}
208
209static void __vsock_remove_connected(struct vsock_sock *vsk)
210{
211 list_del_init(&vsk->connected_table);
212 sock_put(&vsk->sk);
213}
214
215static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
216{
217 struct vsock_sock *vsk;
218
219 list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table)
Reilly Grant990454b2013-04-01 11:41:52 -0700220 if (addr->svm_port == vsk->local_addr.svm_port)
Andy Kingd021c342013-02-06 14:23:56 +0000221 return sk_vsock(vsk);
222
223 return NULL;
224}
225
226static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
227 struct sockaddr_vm *dst)
228{
229 struct vsock_sock *vsk;
230
231 list_for_each_entry(vsk, vsock_connected_sockets(src, dst),
232 connected_table) {
Reilly Grant990454b2013-04-01 11:41:52 -0700233 if (vsock_addr_equals_addr(src, &vsk->remote_addr) &&
234 dst->svm_port == vsk->local_addr.svm_port) {
Andy Kingd021c342013-02-06 14:23:56 +0000235 return sk_vsock(vsk);
236 }
237 }
238
239 return NULL;
240}
241
242static bool __vsock_in_bound_table(struct vsock_sock *vsk)
243{
244 return !list_empty(&vsk->bound_table);
245}
246
247static bool __vsock_in_connected_table(struct vsock_sock *vsk)
248{
249 return !list_empty(&vsk->connected_table);
250}
251
252static void vsock_insert_unbound(struct vsock_sock *vsk)
253{
254 spin_lock_bh(&vsock_table_lock);
255 __vsock_insert_bound(vsock_unbound_sockets, vsk);
256 spin_unlock_bh(&vsock_table_lock);
257}
258
259void vsock_insert_connected(struct vsock_sock *vsk)
260{
261 struct list_head *list = vsock_connected_sockets(
262 &vsk->remote_addr, &vsk->local_addr);
263
264 spin_lock_bh(&vsock_table_lock);
265 __vsock_insert_connected(list, vsk);
266 spin_unlock_bh(&vsock_table_lock);
267}
268EXPORT_SYMBOL_GPL(vsock_insert_connected);
269
270void vsock_remove_bound(struct vsock_sock *vsk)
271{
272 spin_lock_bh(&vsock_table_lock);
273 __vsock_remove_bound(vsk);
274 spin_unlock_bh(&vsock_table_lock);
275}
276EXPORT_SYMBOL_GPL(vsock_remove_bound);
277
278void vsock_remove_connected(struct vsock_sock *vsk)
279{
280 spin_lock_bh(&vsock_table_lock);
281 __vsock_remove_connected(vsk);
282 spin_unlock_bh(&vsock_table_lock);
283}
284EXPORT_SYMBOL_GPL(vsock_remove_connected);
285
286struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
287{
288 struct sock *sk;
289
290 spin_lock_bh(&vsock_table_lock);
291 sk = __vsock_find_bound_socket(addr);
292 if (sk)
293 sock_hold(sk);
294
295 spin_unlock_bh(&vsock_table_lock);
296
297 return sk;
298}
299EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
300
301struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
302 struct sockaddr_vm *dst)
303{
304 struct sock *sk;
305
306 spin_lock_bh(&vsock_table_lock);
307 sk = __vsock_find_connected_socket(src, dst);
308 if (sk)
309 sock_hold(sk);
310
311 spin_unlock_bh(&vsock_table_lock);
312
313 return sk;
314}
315EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
316
317static bool vsock_in_bound_table(struct vsock_sock *vsk)
318{
319 bool ret;
320
321 spin_lock_bh(&vsock_table_lock);
322 ret = __vsock_in_bound_table(vsk);
323 spin_unlock_bh(&vsock_table_lock);
324
325 return ret;
326}
327
328static bool vsock_in_connected_table(struct vsock_sock *vsk)
329{
330 bool ret;
331
332 spin_lock_bh(&vsock_table_lock);
333 ret = __vsock_in_connected_table(vsk);
334 spin_unlock_bh(&vsock_table_lock);
335
336 return ret;
337}
338
339void vsock_for_each_connected_socket(void (*fn)(struct sock *sk))
340{
341 int i;
342
343 spin_lock_bh(&vsock_table_lock);
344
345 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) {
346 struct vsock_sock *vsk;
347 list_for_each_entry(vsk, &vsock_connected_table[i],
Julia Lawalld9af2d62013-08-05 16:47:38 +0200348 connected_table)
Andy Kingd021c342013-02-06 14:23:56 +0000349 fn(sk_vsock(vsk));
350 }
351
352 spin_unlock_bh(&vsock_table_lock);
353}
354EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket);
355
356void vsock_add_pending(struct sock *listener, struct sock *pending)
357{
358 struct vsock_sock *vlistener;
359 struct vsock_sock *vpending;
360
361 vlistener = vsock_sk(listener);
362 vpending = vsock_sk(pending);
363
364 sock_hold(pending);
365 sock_hold(listener);
366 list_add_tail(&vpending->pending_links, &vlistener->pending_links);
367}
368EXPORT_SYMBOL_GPL(vsock_add_pending);
369
370void vsock_remove_pending(struct sock *listener, struct sock *pending)
371{
372 struct vsock_sock *vpending = vsock_sk(pending);
373
374 list_del_init(&vpending->pending_links);
375 sock_put(listener);
376 sock_put(pending);
377}
378EXPORT_SYMBOL_GPL(vsock_remove_pending);
379
380void vsock_enqueue_accept(struct sock *listener, struct sock *connected)
381{
382 struct vsock_sock *vlistener;
383 struct vsock_sock *vconnected;
384
385 vlistener = vsock_sk(listener);
386 vconnected = vsock_sk(connected);
387
388 sock_hold(connected);
389 sock_hold(listener);
390 list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue);
391}
392EXPORT_SYMBOL_GPL(vsock_enqueue_accept);
393
394static struct sock *vsock_dequeue_accept(struct sock *listener)
395{
396 struct vsock_sock *vlistener;
397 struct vsock_sock *vconnected;
398
399 vlistener = vsock_sk(listener);
400
401 if (list_empty(&vlistener->accept_queue))
402 return NULL;
403
404 vconnected = list_entry(vlistener->accept_queue.next,
405 struct vsock_sock, accept_queue);
406
407 list_del_init(&vconnected->accept_queue);
408 sock_put(listener);
409 /* The caller will need a reference on the connected socket so we let
410 * it call sock_put().
411 */
412
413 return sk_vsock(vconnected);
414}
415
416static bool vsock_is_accept_queue_empty(struct sock *sk)
417{
418 struct vsock_sock *vsk = vsock_sk(sk);
419 return list_empty(&vsk->accept_queue);
420}
421
422static bool vsock_is_pending(struct sock *sk)
423{
424 struct vsock_sock *vsk = vsock_sk(sk);
425 return !list_empty(&vsk->pending_links);
426}
427
428static int vsock_send_shutdown(struct sock *sk, int mode)
429{
430 return transport->shutdown(vsock_sk(sk), mode);
431}
432
433void vsock_pending_work(struct work_struct *work)
434{
435 struct sock *sk;
436 struct sock *listener;
437 struct vsock_sock *vsk;
438 bool cleanup;
439
440 vsk = container_of(work, struct vsock_sock, dwork.work);
441 sk = sk_vsock(vsk);
442 listener = vsk->listener;
443 cleanup = true;
444
445 lock_sock(listener);
446 lock_sock(sk);
447
448 if (vsock_is_pending(sk)) {
449 vsock_remove_pending(listener, sk);
450 } else if (!vsk->rejected) {
451 /* We are not on the pending list and accept() did not reject
452 * us, so we must have been accepted by our user process. We
453 * just need to drop our references to the sockets and be on
454 * our way.
455 */
456 cleanup = false;
457 goto out;
458 }
459
460 listener->sk_ack_backlog--;
461
462 /* We need to remove ourself from the global connected sockets list so
463 * incoming packets can't find this socket, and to reduce the reference
464 * count.
465 */
466 if (vsock_in_connected_table(vsk))
467 vsock_remove_connected(vsk);
468
469 sk->sk_state = SS_FREE;
470
471out:
472 release_sock(sk);
473 release_sock(listener);
474 if (cleanup)
475 sock_put(sk);
476
477 sock_put(sk);
478 sock_put(listener);
479}
480EXPORT_SYMBOL_GPL(vsock_pending_work);
481
482/**** SOCKET OPERATIONS ****/
483
484static int __vsock_bind_stream(struct vsock_sock *vsk,
485 struct sockaddr_vm *addr)
486{
487 static u32 port = LAST_RESERVED_PORT + 1;
488 struct sockaddr_vm new_addr;
489
490 vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
491
492 if (addr->svm_port == VMADDR_PORT_ANY) {
493 bool found = false;
494 unsigned int i;
495
496 for (i = 0; i < MAX_PORT_RETRIES; i++) {
497 if (port <= LAST_RESERVED_PORT)
498 port = LAST_RESERVED_PORT + 1;
499
500 new_addr.svm_port = port++;
501
502 if (!__vsock_find_bound_socket(&new_addr)) {
503 found = true;
504 break;
505 }
506 }
507
508 if (!found)
509 return -EADDRNOTAVAIL;
510 } else {
511 /* If port is in reserved range, ensure caller
512 * has necessary privileges.
513 */
514 if (addr->svm_port <= LAST_RESERVED_PORT &&
515 !capable(CAP_NET_BIND_SERVICE)) {
516 return -EACCES;
517 }
518
519 if (__vsock_find_bound_socket(&new_addr))
520 return -EADDRINUSE;
521 }
522
523 vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
524
525 /* Remove stream sockets from the unbound list and add them to the hash
526 * table for easy lookup by its address. The unbound list is simply an
527 * extra entry at the end of the hash table, a trick used by AF_UNIX.
528 */
529 __vsock_remove_bound(vsk);
530 __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk);
531
532 return 0;
533}
534
535static int __vsock_bind_dgram(struct vsock_sock *vsk,
536 struct sockaddr_vm *addr)
537{
538 return transport->dgram_bind(vsk, addr);
539}
540
541static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
542{
543 struct vsock_sock *vsk = vsock_sk(sk);
544 u32 cid;
545 int retval;
546
547 /* First ensure this socket isn't already bound. */
548 if (vsock_addr_bound(&vsk->local_addr))
549 return -EINVAL;
550
551 /* Now bind to the provided address or select appropriate values if
552 * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that
553 * like AF_INET prevents binding to a non-local IP address (in most
554 * cases), we only allow binding to the local CID.
555 */
556 cid = transport->get_local_cid();
557 if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY)
558 return -EADDRNOTAVAIL;
559
560 switch (sk->sk_socket->type) {
561 case SOCK_STREAM:
562 spin_lock_bh(&vsock_table_lock);
563 retval = __vsock_bind_stream(vsk, addr);
564 spin_unlock_bh(&vsock_table_lock);
565 break;
566
567 case SOCK_DGRAM:
568 retval = __vsock_bind_dgram(vsk, addr);
569 break;
570
571 default:
572 retval = -EINVAL;
573 break;
574 }
575
576 return retval;
577}
578
579struct sock *__vsock_create(struct net *net,
580 struct socket *sock,
581 struct sock *parent,
582 gfp_t priority,
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500583 unsigned short type,
584 int kern)
Andy Kingd021c342013-02-06 14:23:56 +0000585{
586 struct sock *sk;
587 struct vsock_sock *psk;
588 struct vsock_sock *vsk;
589
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500590 sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern);
Andy Kingd021c342013-02-06 14:23:56 +0000591 if (!sk)
592 return NULL;
593
594 sock_init_data(sock, sk);
595
596 /* sk->sk_type is normally set in sock_init_data, but only if sock is
597 * non-NULL. We make sure that our sockets always have a type by
598 * setting it here if needed.
599 */
600 if (!sock)
601 sk->sk_type = type;
602
603 vsk = vsock_sk(sk);
604 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
605 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
606
607 sk->sk_destruct = vsock_sk_destruct;
608 sk->sk_backlog_rcv = vsock_queue_rcv_skb;
609 sk->sk_state = 0;
610 sock_reset_flag(sk, SOCK_DONE);
611
612 INIT_LIST_HEAD(&vsk->bound_table);
613 INIT_LIST_HEAD(&vsk->connected_table);
614 vsk->listener = NULL;
615 INIT_LIST_HEAD(&vsk->pending_links);
616 INIT_LIST_HEAD(&vsk->accept_queue);
617 vsk->rejected = false;
618 vsk->sent_request = false;
619 vsk->ignore_connecting_rst = false;
620 vsk->peer_shutdown = 0;
621
622 psk = parent ? vsock_sk(parent) : NULL;
623 if (parent) {
624 vsk->trusted = psk->trusted;
625 vsk->owner = get_cred(psk->owner);
626 vsk->connect_timeout = psk->connect_timeout;
627 } else {
628 vsk->trusted = capable(CAP_NET_ADMIN);
629 vsk->owner = get_current_cred();
630 vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT;
631 }
632
633 if (transport->init(vsk, psk) < 0) {
634 sk_free(sk);
635 return NULL;
636 }
637
638 if (sock)
639 vsock_insert_unbound(vsk);
640
641 return sk;
642}
643EXPORT_SYMBOL_GPL(__vsock_create);
644
645static void __vsock_release(struct sock *sk)
646{
647 if (sk) {
648 struct sk_buff *skb;
649 struct sock *pending;
650 struct vsock_sock *vsk;
651
652 vsk = vsock_sk(sk);
653 pending = NULL; /* Compiler warning. */
654
655 if (vsock_in_bound_table(vsk))
656 vsock_remove_bound(vsk);
657
658 if (vsock_in_connected_table(vsk))
659 vsock_remove_connected(vsk);
660
661 transport->release(vsk);
662
663 lock_sock(sk);
664 sock_orphan(sk);
665 sk->sk_shutdown = SHUTDOWN_MASK;
666
667 while ((skb = skb_dequeue(&sk->sk_receive_queue)))
668 kfree_skb(skb);
669
670 /* Clean up any sockets that never were accepted. */
671 while ((pending = vsock_dequeue_accept(sk)) != NULL) {
672 __vsock_release(pending);
673 sock_put(pending);
674 }
675
676 release_sock(sk);
677 sock_put(sk);
678 }
679}
680
681static void vsock_sk_destruct(struct sock *sk)
682{
683 struct vsock_sock *vsk = vsock_sk(sk);
684
685 transport->destruct(vsk);
686
687 /* When clearing these addresses, there's no need to set the family and
688 * possibly register the address family with the kernel.
689 */
690 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
691 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
692
693 put_cred(vsk->owner);
694}
695
696static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
697{
698 int err;
699
700 err = sock_queue_rcv_skb(sk, skb);
701 if (err)
702 kfree_skb(skb);
703
704 return err;
705}
706
707s64 vsock_stream_has_data(struct vsock_sock *vsk)
708{
709 return transport->stream_has_data(vsk);
710}
711EXPORT_SYMBOL_GPL(vsock_stream_has_data);
712
713s64 vsock_stream_has_space(struct vsock_sock *vsk)
714{
715 return transport->stream_has_space(vsk);
716}
717EXPORT_SYMBOL_GPL(vsock_stream_has_space);
718
719static int vsock_release(struct socket *sock)
720{
721 __vsock_release(sock->sk);
722 sock->sk = NULL;
723 sock->state = SS_FREE;
724
725 return 0;
726}
727
728static int
729vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
730{
731 int err;
732 struct sock *sk;
733 struct sockaddr_vm *vm_addr;
734
735 sk = sock->sk;
736
737 if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0)
738 return -EINVAL;
739
740 lock_sock(sk);
741 err = __vsock_bind(sk, vm_addr);
742 release_sock(sk);
743
744 return err;
745}
746
747static int vsock_getname(struct socket *sock,
748 struct sockaddr *addr, int *addr_len, int peer)
749{
750 int err;
751 struct sock *sk;
752 struct vsock_sock *vsk;
753 struct sockaddr_vm *vm_addr;
754
755 sk = sock->sk;
756 vsk = vsock_sk(sk);
757 err = 0;
758
759 lock_sock(sk);
760
761 if (peer) {
762 if (sock->state != SS_CONNECTED) {
763 err = -ENOTCONN;
764 goto out;
765 }
766 vm_addr = &vsk->remote_addr;
767 } else {
768 vm_addr = &vsk->local_addr;
769 }
770
771 if (!vm_addr) {
772 err = -EINVAL;
773 goto out;
774 }
775
776 /* sys_getsockname() and sys_getpeername() pass us a
777 * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately
778 * that macro is defined in socket.c instead of .h, so we hardcode its
779 * value here.
780 */
781 BUILD_BUG_ON(sizeof(*vm_addr) > 128);
782 memcpy(addr, vm_addr, sizeof(*vm_addr));
783 *addr_len = sizeof(*vm_addr);
784
785out:
786 release_sock(sk);
787 return err;
788}
789
790static int vsock_shutdown(struct socket *sock, int mode)
791{
792 int err;
793 struct sock *sk;
794
795 /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses
796 * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode
797 * here like the other address families do. Note also that the
798 * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3),
799 * which is what we want.
800 */
801 mode++;
802
803 if ((mode & ~SHUTDOWN_MASK) || !mode)
804 return -EINVAL;
805
806 /* If this is a STREAM socket and it is not connected then bail out
807 * immediately. If it is a DGRAM socket then we must first kick the
808 * socket so that it wakes up from any sleeping calls, for example
809 * recv(), and then afterwards return the error.
810 */
811
812 sk = sock->sk;
813 if (sock->state == SS_UNCONNECTED) {
814 err = -ENOTCONN;
815 if (sk->sk_type == SOCK_STREAM)
816 return err;
817 } else {
818 sock->state = SS_DISCONNECTING;
819 err = 0;
820 }
821
822 /* Receive and send shutdowns are treated alike. */
823 mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN);
824 if (mode) {
825 lock_sock(sk);
826 sk->sk_shutdown |= mode;
827 sk->sk_state_change(sk);
828 release_sock(sk);
829
830 if (sk->sk_type == SOCK_STREAM) {
831 sock_reset_flag(sk, SOCK_DONE);
832 vsock_send_shutdown(sk, mode);
833 }
834 }
835
836 return err;
837}
838
839static unsigned int vsock_poll(struct file *file, struct socket *sock,
840 poll_table *wait)
841{
842 struct sock *sk;
843 unsigned int mask;
844 struct vsock_sock *vsk;
845
846 sk = sock->sk;
847 vsk = vsock_sk(sk);
848
849 poll_wait(file, sk_sleep(sk), wait);
850 mask = 0;
851
852 if (sk->sk_err)
853 /* Signify that there has been an error on this socket. */
854 mask |= POLLERR;
855
856 /* INET sockets treat local write shutdown and peer write shutdown as a
857 * case of POLLHUP set.
858 */
859 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
860 ((sk->sk_shutdown & SEND_SHUTDOWN) &&
861 (vsk->peer_shutdown & SEND_SHUTDOWN))) {
862 mask |= POLLHUP;
863 }
864
865 if (sk->sk_shutdown & RCV_SHUTDOWN ||
866 vsk->peer_shutdown & SEND_SHUTDOWN) {
867 mask |= POLLRDHUP;
868 }
869
870 if (sock->type == SOCK_DGRAM) {
871 /* For datagram sockets we can read if there is something in
872 * the queue and write as long as the socket isn't shutdown for
873 * sending.
874 */
875 if (!skb_queue_empty(&sk->sk_receive_queue) ||
876 (sk->sk_shutdown & RCV_SHUTDOWN)) {
877 mask |= POLLIN | POLLRDNORM;
878 }
879
880 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
881 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
882
883 } else if (sock->type == SOCK_STREAM) {
884 lock_sock(sk);
885
886 /* Listening sockets that have connections in their accept
887 * queue can be read.
888 */
Stefan Hajnocziea3803c2015-10-29 11:57:42 +0000889 if (sk->sk_state == VSOCK_SS_LISTEN
Andy Kingd021c342013-02-06 14:23:56 +0000890 && !vsock_is_accept_queue_empty(sk))
891 mask |= POLLIN | POLLRDNORM;
892
893 /* If there is something in the queue then we can read. */
894 if (transport->stream_is_active(vsk) &&
895 !(sk->sk_shutdown & RCV_SHUTDOWN)) {
896 bool data_ready_now = false;
897 int ret = transport->notify_poll_in(
898 vsk, 1, &data_ready_now);
899 if (ret < 0) {
900 mask |= POLLERR;
901 } else {
902 if (data_ready_now)
903 mask |= POLLIN | POLLRDNORM;
904
905 }
906 }
907
908 /* Sockets whose connections have been closed, reset, or
909 * terminated should also be considered read, and we check the
910 * shutdown flag for that.
911 */
912 if (sk->sk_shutdown & RCV_SHUTDOWN ||
913 vsk->peer_shutdown & SEND_SHUTDOWN) {
914 mask |= POLLIN | POLLRDNORM;
915 }
916
917 /* Connected sockets that can produce data can be written. */
918 if (sk->sk_state == SS_CONNECTED) {
919 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
920 bool space_avail_now = false;
921 int ret = transport->notify_poll_out(
922 vsk, 1, &space_avail_now);
923 if (ret < 0) {
924 mask |= POLLERR;
925 } else {
926 if (space_avail_now)
927 /* Remove POLLWRBAND since INET
928 * sockets are not setting it.
929 */
930 mask |= POLLOUT | POLLWRNORM;
931
932 }
933 }
934 }
935
936 /* Simulate INET socket poll behaviors, which sets
937 * POLLOUT|POLLWRNORM when peer is closed and nothing to read,
938 * but local send is not shutdown.
939 */
940 if (sk->sk_state == SS_UNCONNECTED) {
941 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
942 mask |= POLLOUT | POLLWRNORM;
943
944 }
945
946 release_sock(sk);
947 }
948
949 return mask;
950}
951
Ying Xue1b784142015-03-02 15:37:48 +0800952static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg,
953 size_t len)
Andy Kingd021c342013-02-06 14:23:56 +0000954{
955 int err;
956 struct sock *sk;
957 struct vsock_sock *vsk;
958 struct sockaddr_vm *remote_addr;
959
960 if (msg->msg_flags & MSG_OOB)
961 return -EOPNOTSUPP;
962
963 /* For now, MSG_DONTWAIT is always assumed... */
964 err = 0;
965 sk = sock->sk;
966 vsk = vsock_sk(sk);
967
968 lock_sock(sk);
969
Asias Heb3a6dfe2013-06-20 17:20:30 +0800970 err = vsock_auto_bind(vsk);
971 if (err)
972 goto out;
Andy Kingd021c342013-02-06 14:23:56 +0000973
Andy Kingd021c342013-02-06 14:23:56 +0000974
975 /* If the provided message contains an address, use that. Otherwise
976 * fall back on the socket's remote handle (if it has been connected).
977 */
978 if (msg->msg_name &&
979 vsock_addr_cast(msg->msg_name, msg->msg_namelen,
980 &remote_addr) == 0) {
981 /* Ensure this address is of the right type and is a valid
982 * destination.
983 */
984
985 if (remote_addr->svm_cid == VMADDR_CID_ANY)
986 remote_addr->svm_cid = transport->get_local_cid();
987
988 if (!vsock_addr_bound(remote_addr)) {
989 err = -EINVAL;
990 goto out;
991 }
992 } else if (sock->state == SS_CONNECTED) {
993 remote_addr = &vsk->remote_addr;
994
995 if (remote_addr->svm_cid == VMADDR_CID_ANY)
996 remote_addr->svm_cid = transport->get_local_cid();
997
998 /* XXX Should connect() or this function ensure remote_addr is
999 * bound?
1000 */
1001 if (!vsock_addr_bound(&vsk->remote_addr)) {
1002 err = -EINVAL;
1003 goto out;
1004 }
1005 } else {
1006 err = -EINVAL;
1007 goto out;
1008 }
1009
1010 if (!transport->dgram_allow(remote_addr->svm_cid,
1011 remote_addr->svm_port)) {
1012 err = -EINVAL;
1013 goto out;
1014 }
1015
Al Viro0f7db232014-11-20 04:05:34 -05001016 err = transport->dgram_enqueue(vsk, remote_addr, msg, len);
Andy Kingd021c342013-02-06 14:23:56 +00001017
1018out:
1019 release_sock(sk);
1020 return err;
1021}
1022
1023static int vsock_dgram_connect(struct socket *sock,
1024 struct sockaddr *addr, int addr_len, int flags)
1025{
1026 int err;
1027 struct sock *sk;
1028 struct vsock_sock *vsk;
1029 struct sockaddr_vm *remote_addr;
1030
1031 sk = sock->sk;
1032 vsk = vsock_sk(sk);
1033
1034 err = vsock_addr_cast(addr, addr_len, &remote_addr);
1035 if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) {
1036 lock_sock(sk);
1037 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY,
1038 VMADDR_PORT_ANY);
1039 sock->state = SS_UNCONNECTED;
1040 release_sock(sk);
1041 return 0;
1042 } else if (err != 0)
1043 return -EINVAL;
1044
1045 lock_sock(sk);
1046
Asias Heb3a6dfe2013-06-20 17:20:30 +08001047 err = vsock_auto_bind(vsk);
1048 if (err)
1049 goto out;
Andy Kingd021c342013-02-06 14:23:56 +00001050
1051 if (!transport->dgram_allow(remote_addr->svm_cid,
1052 remote_addr->svm_port)) {
1053 err = -EINVAL;
1054 goto out;
1055 }
1056
1057 memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr));
1058 sock->state = SS_CONNECTED;
1059
1060out:
1061 release_sock(sk);
1062 return err;
1063}
1064
Ying Xue1b784142015-03-02 15:37:48 +08001065static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
1066 size_t len, int flags)
Andy Kingd021c342013-02-06 14:23:56 +00001067{
Ying Xue1b784142015-03-02 15:37:48 +08001068 return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags);
Andy Kingd021c342013-02-06 14:23:56 +00001069}
1070
1071static const struct proto_ops vsock_dgram_ops = {
1072 .family = PF_VSOCK,
1073 .owner = THIS_MODULE,
1074 .release = vsock_release,
1075 .bind = vsock_bind,
1076 .connect = vsock_dgram_connect,
1077 .socketpair = sock_no_socketpair,
1078 .accept = sock_no_accept,
1079 .getname = vsock_getname,
1080 .poll = vsock_poll,
1081 .ioctl = sock_no_ioctl,
1082 .listen = sock_no_listen,
1083 .shutdown = vsock_shutdown,
1084 .setsockopt = sock_no_setsockopt,
1085 .getsockopt = sock_no_getsockopt,
1086 .sendmsg = vsock_dgram_sendmsg,
1087 .recvmsg = vsock_dgram_recvmsg,
1088 .mmap = sock_no_mmap,
1089 .sendpage = sock_no_sendpage,
1090};
1091
1092static void vsock_connect_timeout(struct work_struct *work)
1093{
1094 struct sock *sk;
1095 struct vsock_sock *vsk;
1096
1097 vsk = container_of(work, struct vsock_sock, dwork.work);
1098 sk = sk_vsock(vsk);
1099
1100 lock_sock(sk);
1101 if (sk->sk_state == SS_CONNECTING &&
1102 (sk->sk_shutdown != SHUTDOWN_MASK)) {
1103 sk->sk_state = SS_UNCONNECTED;
1104 sk->sk_err = ETIMEDOUT;
1105 sk->sk_error_report(sk);
1106 }
1107 release_sock(sk);
1108
1109 sock_put(sk);
1110}
1111
1112static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
1113 int addr_len, int flags)
1114{
1115 int err;
1116 struct sock *sk;
1117 struct vsock_sock *vsk;
1118 struct sockaddr_vm *remote_addr;
1119 long timeout;
1120 DEFINE_WAIT(wait);
1121
1122 err = 0;
1123 sk = sock->sk;
1124 vsk = vsock_sk(sk);
1125
1126 lock_sock(sk);
1127
1128 /* XXX AF_UNSPEC should make us disconnect like AF_INET. */
1129 switch (sock->state) {
1130 case SS_CONNECTED:
1131 err = -EISCONN;
1132 goto out;
1133 case SS_DISCONNECTING:
1134 err = -EINVAL;
1135 goto out;
1136 case SS_CONNECTING:
1137 /* This continues on so we can move sock into the SS_CONNECTED
1138 * state once the connection has completed (at which point err
1139 * will be set to zero also). Otherwise, we will either wait
1140 * for the connection or return -EALREADY should this be a
1141 * non-blocking call.
1142 */
1143 err = -EALREADY;
1144 break;
1145 default:
Stefan Hajnocziea3803c2015-10-29 11:57:42 +00001146 if ((sk->sk_state == VSOCK_SS_LISTEN) ||
Andy Kingd021c342013-02-06 14:23:56 +00001147 vsock_addr_cast(addr, addr_len, &remote_addr) != 0) {
1148 err = -EINVAL;
1149 goto out;
1150 }
1151
1152 /* The hypervisor and well-known contexts do not have socket
1153 * endpoints.
1154 */
1155 if (!transport->stream_allow(remote_addr->svm_cid,
1156 remote_addr->svm_port)) {
1157 err = -ENETUNREACH;
1158 goto out;
1159 }
1160
1161 /* Set the remote address that we are connecting to. */
1162 memcpy(&vsk->remote_addr, remote_addr,
1163 sizeof(vsk->remote_addr));
1164
Asias Heb3a6dfe2013-06-20 17:20:30 +08001165 err = vsock_auto_bind(vsk);
1166 if (err)
1167 goto out;
Andy Kingd021c342013-02-06 14:23:56 +00001168
1169 sk->sk_state = SS_CONNECTING;
1170
1171 err = transport->connect(vsk);
1172 if (err < 0)
1173 goto out;
1174
1175 /* Mark sock as connecting and set the error code to in
1176 * progress in case this is a non-blocking connect.
1177 */
1178 sock->state = SS_CONNECTING;
1179 err = -EINPROGRESS;
1180 }
1181
1182 /* The receive path will handle all communication until we are able to
1183 * enter the connected state. Here we wait for the connection to be
1184 * completed or a notification of an error.
1185 */
1186 timeout = vsk->connect_timeout;
1187 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1188
1189 while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) {
1190 if (flags & O_NONBLOCK) {
1191 /* If we're not going to block, we schedule a timeout
1192 * function to generate a timeout on the connection
1193 * attempt, in case the peer doesn't respond in a
1194 * timely manner. We hold on to the socket until the
1195 * timeout fires.
1196 */
1197 sock_hold(sk);
1198 INIT_DELAYED_WORK(&vsk->dwork,
1199 vsock_connect_timeout);
1200 schedule_delayed_work(&vsk->dwork, timeout);
1201
1202 /* Skip ahead to preserve error code set above. */
1203 goto out_wait;
1204 }
1205
1206 release_sock(sk);
1207 timeout = schedule_timeout(timeout);
1208 lock_sock(sk);
1209
1210 if (signal_pending(current)) {
1211 err = sock_intr_errno(timeout);
1212 goto out_wait_error;
1213 } else if (timeout == 0) {
1214 err = -ETIMEDOUT;
1215 goto out_wait_error;
1216 }
1217
1218 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1219 }
1220
1221 if (sk->sk_err) {
1222 err = -sk->sk_err;
1223 goto out_wait_error;
1224 } else
1225 err = 0;
1226
1227out_wait:
1228 finish_wait(sk_sleep(sk), &wait);
1229out:
1230 release_sock(sk);
1231 return err;
1232
1233out_wait_error:
1234 sk->sk_state = SS_UNCONNECTED;
1235 sock->state = SS_UNCONNECTED;
1236 goto out_wait;
1237}
1238
1239static int vsock_accept(struct socket *sock, struct socket *newsock, int flags)
1240{
1241 struct sock *listener;
1242 int err;
1243 struct sock *connected;
1244 struct vsock_sock *vconnected;
1245 long timeout;
1246 DEFINE_WAIT(wait);
1247
1248 err = 0;
1249 listener = sock->sk;
1250
1251 lock_sock(listener);
1252
1253 if (sock->type != SOCK_STREAM) {
1254 err = -EOPNOTSUPP;
1255 goto out;
1256 }
1257
Stefan Hajnocziea3803c2015-10-29 11:57:42 +00001258 if (listener->sk_state != VSOCK_SS_LISTEN) {
Andy Kingd021c342013-02-06 14:23:56 +00001259 err = -EINVAL;
1260 goto out;
1261 }
1262
1263 /* Wait for children sockets to appear; these are the new sockets
1264 * created upon connection establishment.
1265 */
1266 timeout = sock_sndtimeo(listener, flags & O_NONBLOCK);
1267 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1268
1269 while ((connected = vsock_dequeue_accept(listener)) == NULL &&
1270 listener->sk_err == 0) {
1271 release_sock(listener);
1272 timeout = schedule_timeout(timeout);
1273 lock_sock(listener);
1274
1275 if (signal_pending(current)) {
1276 err = sock_intr_errno(timeout);
1277 goto out_wait;
1278 } else if (timeout == 0) {
1279 err = -EAGAIN;
1280 goto out_wait;
1281 }
1282
1283 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1284 }
1285
1286 if (listener->sk_err)
1287 err = -listener->sk_err;
1288
1289 if (connected) {
1290 listener->sk_ack_backlog--;
1291
1292 lock_sock(connected);
1293 vconnected = vsock_sk(connected);
1294
1295 /* If the listener socket has received an error, then we should
1296 * reject this socket and return. Note that we simply mark the
1297 * socket rejected, drop our reference, and let the cleanup
1298 * function handle the cleanup; the fact that we found it in
1299 * the listener's accept queue guarantees that the cleanup
1300 * function hasn't run yet.
1301 */
1302 if (err) {
1303 vconnected->rejected = true;
1304 release_sock(connected);
1305 sock_put(connected);
1306 goto out_wait;
1307 }
1308
1309 newsock->state = SS_CONNECTED;
1310 sock_graft(connected, newsock);
1311 release_sock(connected);
1312 sock_put(connected);
1313 }
1314
1315out_wait:
1316 finish_wait(sk_sleep(listener), &wait);
1317out:
1318 release_sock(listener);
1319 return err;
1320}
1321
1322static int vsock_listen(struct socket *sock, int backlog)
1323{
1324 int err;
1325 struct sock *sk;
1326 struct vsock_sock *vsk;
1327
1328 sk = sock->sk;
1329
1330 lock_sock(sk);
1331
1332 if (sock->type != SOCK_STREAM) {
1333 err = -EOPNOTSUPP;
1334 goto out;
1335 }
1336
1337 if (sock->state != SS_UNCONNECTED) {
1338 err = -EINVAL;
1339 goto out;
1340 }
1341
1342 vsk = vsock_sk(sk);
1343
1344 if (!vsock_addr_bound(&vsk->local_addr)) {
1345 err = -EINVAL;
1346 goto out;
1347 }
1348
1349 sk->sk_max_ack_backlog = backlog;
Stefan Hajnocziea3803c2015-10-29 11:57:42 +00001350 sk->sk_state = VSOCK_SS_LISTEN;
Andy Kingd021c342013-02-06 14:23:56 +00001351
1352 err = 0;
1353
1354out:
1355 release_sock(sk);
1356 return err;
1357}
1358
1359static int vsock_stream_setsockopt(struct socket *sock,
1360 int level,
1361 int optname,
1362 char __user *optval,
1363 unsigned int optlen)
1364{
1365 int err;
1366 struct sock *sk;
1367 struct vsock_sock *vsk;
1368 u64 val;
1369
1370 if (level != AF_VSOCK)
1371 return -ENOPROTOOPT;
1372
1373#define COPY_IN(_v) \
1374 do { \
1375 if (optlen < sizeof(_v)) { \
1376 err = -EINVAL; \
1377 goto exit; \
1378 } \
1379 if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \
1380 err = -EFAULT; \
1381 goto exit; \
1382 } \
1383 } while (0)
1384
1385 err = 0;
1386 sk = sock->sk;
1387 vsk = vsock_sk(sk);
1388
1389 lock_sock(sk);
1390
1391 switch (optname) {
1392 case SO_VM_SOCKETS_BUFFER_SIZE:
1393 COPY_IN(val);
1394 transport->set_buffer_size(vsk, val);
1395 break;
1396
1397 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1398 COPY_IN(val);
1399 transport->set_max_buffer_size(vsk, val);
1400 break;
1401
1402 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1403 COPY_IN(val);
1404 transport->set_min_buffer_size(vsk, val);
1405 break;
1406
1407 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1408 struct timeval tv;
1409 COPY_IN(tv);
1410 if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC &&
1411 tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) {
1412 vsk->connect_timeout = tv.tv_sec * HZ +
1413 DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ));
1414 if (vsk->connect_timeout == 0)
1415 vsk->connect_timeout =
1416 VSOCK_DEFAULT_CONNECT_TIMEOUT;
1417
1418 } else {
1419 err = -ERANGE;
1420 }
1421 break;
1422 }
1423
1424 default:
1425 err = -ENOPROTOOPT;
1426 break;
1427 }
1428
1429#undef COPY_IN
1430
1431exit:
1432 release_sock(sk);
1433 return err;
1434}
1435
1436static int vsock_stream_getsockopt(struct socket *sock,
1437 int level, int optname,
1438 char __user *optval,
1439 int __user *optlen)
1440{
1441 int err;
1442 int len;
1443 struct sock *sk;
1444 struct vsock_sock *vsk;
1445 u64 val;
1446
1447 if (level != AF_VSOCK)
1448 return -ENOPROTOOPT;
1449
1450 err = get_user(len, optlen);
1451 if (err != 0)
1452 return err;
1453
1454#define COPY_OUT(_v) \
1455 do { \
1456 if (len < sizeof(_v)) \
1457 return -EINVAL; \
1458 \
1459 len = sizeof(_v); \
1460 if (copy_to_user(optval, &_v, len) != 0) \
1461 return -EFAULT; \
1462 \
1463 } while (0)
1464
1465 err = 0;
1466 sk = sock->sk;
1467 vsk = vsock_sk(sk);
1468
1469 switch (optname) {
1470 case SO_VM_SOCKETS_BUFFER_SIZE:
1471 val = transport->get_buffer_size(vsk);
1472 COPY_OUT(val);
1473 break;
1474
1475 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1476 val = transport->get_max_buffer_size(vsk);
1477 COPY_OUT(val);
1478 break;
1479
1480 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1481 val = transport->get_min_buffer_size(vsk);
1482 COPY_OUT(val);
1483 break;
1484
1485 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1486 struct timeval tv;
1487 tv.tv_sec = vsk->connect_timeout / HZ;
1488 tv.tv_usec =
1489 (vsk->connect_timeout -
1490 tv.tv_sec * HZ) * (1000000 / HZ);
1491 COPY_OUT(tv);
1492 break;
1493 }
1494 default:
1495 return -ENOPROTOOPT;
1496 }
1497
1498 err = put_user(len, optlen);
1499 if (err != 0)
1500 return -EFAULT;
1501
1502#undef COPY_OUT
1503
1504 return 0;
1505}
1506
Ying Xue1b784142015-03-02 15:37:48 +08001507static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg,
1508 size_t len)
Andy Kingd021c342013-02-06 14:23:56 +00001509{
1510 struct sock *sk;
1511 struct vsock_sock *vsk;
1512 ssize_t total_written;
1513 long timeout;
1514 int err;
1515 struct vsock_transport_send_notify_data send_data;
1516
1517 DEFINE_WAIT(wait);
1518
1519 sk = sock->sk;
1520 vsk = vsock_sk(sk);
1521 total_written = 0;
1522 err = 0;
1523
1524 if (msg->msg_flags & MSG_OOB)
1525 return -EOPNOTSUPP;
1526
1527 lock_sock(sk);
1528
1529 /* Callers should not provide a destination with stream sockets. */
1530 if (msg->msg_namelen) {
1531 err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP;
1532 goto out;
1533 }
1534
1535 /* Send data only if both sides are not shutdown in the direction. */
1536 if (sk->sk_shutdown & SEND_SHUTDOWN ||
1537 vsk->peer_shutdown & RCV_SHUTDOWN) {
1538 err = -EPIPE;
1539 goto out;
1540 }
1541
1542 if (sk->sk_state != SS_CONNECTED ||
1543 !vsock_addr_bound(&vsk->local_addr)) {
1544 err = -ENOTCONN;
1545 goto out;
1546 }
1547
1548 if (!vsock_addr_bound(&vsk->remote_addr)) {
1549 err = -EDESTADDRREQ;
1550 goto out;
1551 }
1552
1553 /* Wait for room in the produce queue to enqueue our user's data. */
1554 timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1555
1556 err = transport->notify_send_init(vsk, &send_data);
1557 if (err < 0)
1558 goto out;
1559
1560 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1561
1562 while (total_written < len) {
1563 ssize_t written;
1564
1565 while (vsock_stream_has_space(vsk) == 0 &&
1566 sk->sk_err == 0 &&
1567 !(sk->sk_shutdown & SEND_SHUTDOWN) &&
1568 !(vsk->peer_shutdown & RCV_SHUTDOWN)) {
1569
1570 /* Don't wait for non-blocking sockets. */
1571 if (timeout == 0) {
1572 err = -EAGAIN;
1573 goto out_wait;
1574 }
1575
1576 err = transport->notify_send_pre_block(vsk, &send_data);
1577 if (err < 0)
1578 goto out_wait;
1579
1580 release_sock(sk);
1581 timeout = schedule_timeout(timeout);
1582 lock_sock(sk);
1583 if (signal_pending(current)) {
1584 err = sock_intr_errno(timeout);
1585 goto out_wait;
1586 } else if (timeout == 0) {
1587 err = -EAGAIN;
1588 goto out_wait;
1589 }
1590
1591 prepare_to_wait(sk_sleep(sk), &wait,
1592 TASK_INTERRUPTIBLE);
1593 }
1594
1595 /* These checks occur both as part of and after the loop
1596 * conditional since we need to check before and after
1597 * sleeping.
1598 */
1599 if (sk->sk_err) {
1600 err = -sk->sk_err;
1601 goto out_wait;
1602 } else if ((sk->sk_shutdown & SEND_SHUTDOWN) ||
1603 (vsk->peer_shutdown & RCV_SHUTDOWN)) {
1604 err = -EPIPE;
1605 goto out_wait;
1606 }
1607
1608 err = transport->notify_send_pre_enqueue(vsk, &send_data);
1609 if (err < 0)
1610 goto out_wait;
1611
1612 /* Note that enqueue will only write as many bytes as are free
1613 * in the produce queue, so we don't need to ensure len is
1614 * smaller than the queue size. It is the caller's
1615 * responsibility to check how many bytes we were able to send.
1616 */
1617
1618 written = transport->stream_enqueue(
Al Viro0f7db232014-11-20 04:05:34 -05001619 vsk, msg,
Andy Kingd021c342013-02-06 14:23:56 +00001620 len - total_written);
1621 if (written < 0) {
1622 err = -ENOMEM;
1623 goto out_wait;
1624 }
1625
1626 total_written += written;
1627
1628 err = transport->notify_send_post_enqueue(
1629 vsk, written, &send_data);
1630 if (err < 0)
1631 goto out_wait;
1632
1633 }
1634
1635out_wait:
1636 if (total_written > 0)
1637 err = total_written;
1638 finish_wait(sk_sleep(sk), &wait);
1639out:
1640 release_sock(sk);
1641 return err;
1642}
1643
1644
1645static int
Ying Xue1b784142015-03-02 15:37:48 +08001646vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1647 int flags)
Andy Kingd021c342013-02-06 14:23:56 +00001648{
1649 struct sock *sk;
1650 struct vsock_sock *vsk;
1651 int err;
1652 size_t target;
1653 ssize_t copied;
1654 long timeout;
1655 struct vsock_transport_recv_notify_data recv_data;
1656
1657 DEFINE_WAIT(wait);
1658
1659 sk = sock->sk;
1660 vsk = vsock_sk(sk);
1661 err = 0;
1662
1663 lock_sock(sk);
1664
1665 if (sk->sk_state != SS_CONNECTED) {
1666 /* Recvmsg is supposed to return 0 if a peer performs an
1667 * orderly shutdown. Differentiate between that case and when a
1668 * peer has not connected or a local shutdown occured with the
1669 * SOCK_DONE flag.
1670 */
1671 if (sock_flag(sk, SOCK_DONE))
1672 err = 0;
1673 else
1674 err = -ENOTCONN;
1675
1676 goto out;
1677 }
1678
1679 if (flags & MSG_OOB) {
1680 err = -EOPNOTSUPP;
1681 goto out;
1682 }
1683
1684 /* We don't check peer_shutdown flag here since peer may actually shut
1685 * down, but there can be data in the queue that a local socket can
1686 * receive.
1687 */
1688 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1689 err = 0;
1690 goto out;
1691 }
1692
1693 /* It is valid on Linux to pass in a zero-length receive buffer. This
1694 * is not an error. We may as well bail out now.
1695 */
1696 if (!len) {
1697 err = 0;
1698 goto out;
1699 }
1700
1701 /* We must not copy less than target bytes into the user's buffer
1702 * before returning successfully, so we wait for the consume queue to
1703 * have that much data to consume before dequeueing. Note that this
1704 * makes it impossible to handle cases where target is greater than the
1705 * queue size.
1706 */
1707 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1708 if (target >= transport->stream_rcvhiwat(vsk)) {
1709 err = -ENOMEM;
1710 goto out;
1711 }
1712 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1713 copied = 0;
1714
1715 err = transport->notify_recv_init(vsk, target, &recv_data);
1716 if (err < 0)
1717 goto out;
1718
1719 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1720
1721 while (1) {
1722 s64 ready = vsock_stream_has_data(vsk);
1723
1724 if (ready < 0) {
1725 /* Invalid queue pair content. XXX This should be
1726 * changed to a connection reset in a later change.
1727 */
1728
1729 err = -ENOMEM;
1730 goto out_wait;
1731 } else if (ready > 0) {
1732 ssize_t read;
1733
1734 err = transport->notify_recv_pre_dequeue(
1735 vsk, target, &recv_data);
1736 if (err < 0)
1737 break;
1738
1739 read = transport->stream_dequeue(
Al Viro0f7db232014-11-20 04:05:34 -05001740 vsk, msg,
Andy Kingd021c342013-02-06 14:23:56 +00001741 len - copied, flags);
1742 if (read < 0) {
1743 err = -ENOMEM;
1744 break;
1745 }
1746
1747 copied += read;
1748
1749 err = transport->notify_recv_post_dequeue(
1750 vsk, target, read,
1751 !(flags & MSG_PEEK), &recv_data);
1752 if (err < 0)
1753 goto out_wait;
1754
1755 if (read >= target || flags & MSG_PEEK)
1756 break;
1757
1758 target -= read;
1759 } else {
1760 if (sk->sk_err != 0 || (sk->sk_shutdown & RCV_SHUTDOWN)
1761 || (vsk->peer_shutdown & SEND_SHUTDOWN)) {
1762 break;
1763 }
1764 /* Don't wait for non-blocking sockets. */
1765 if (timeout == 0) {
1766 err = -EAGAIN;
1767 break;
1768 }
1769
1770 err = transport->notify_recv_pre_block(
1771 vsk, target, &recv_data);
1772 if (err < 0)
1773 break;
1774
1775 release_sock(sk);
1776 timeout = schedule_timeout(timeout);
1777 lock_sock(sk);
1778
1779 if (signal_pending(current)) {
1780 err = sock_intr_errno(timeout);
1781 break;
1782 } else if (timeout == 0) {
1783 err = -EAGAIN;
1784 break;
1785 }
1786
1787 prepare_to_wait(sk_sleep(sk), &wait,
1788 TASK_INTERRUPTIBLE);
1789 }
1790 }
1791
1792 if (sk->sk_err)
1793 err = -sk->sk_err;
1794 else if (sk->sk_shutdown & RCV_SHUTDOWN)
1795 err = 0;
1796
1797 if (copied > 0) {
1798 /* We only do these additional bookkeeping/notification steps
1799 * if we actually copied something out of the queue pair
1800 * instead of just peeking ahead.
1801 */
1802
1803 if (!(flags & MSG_PEEK)) {
1804 /* If the other side has shutdown for sending and there
1805 * is nothing more to read, then modify the socket
1806 * state.
1807 */
1808 if (vsk->peer_shutdown & SEND_SHUTDOWN) {
1809 if (vsock_stream_has_data(vsk) <= 0) {
1810 sk->sk_state = SS_UNCONNECTED;
1811 sock_set_flag(sk, SOCK_DONE);
1812 sk->sk_state_change(sk);
1813 }
1814 }
1815 }
1816 err = copied;
1817 }
1818
1819out_wait:
1820 finish_wait(sk_sleep(sk), &wait);
1821out:
1822 release_sock(sk);
1823 return err;
1824}
1825
1826static const struct proto_ops vsock_stream_ops = {
1827 .family = PF_VSOCK,
1828 .owner = THIS_MODULE,
1829 .release = vsock_release,
1830 .bind = vsock_bind,
1831 .connect = vsock_stream_connect,
1832 .socketpair = sock_no_socketpair,
1833 .accept = vsock_accept,
1834 .getname = vsock_getname,
1835 .poll = vsock_poll,
1836 .ioctl = sock_no_ioctl,
1837 .listen = vsock_listen,
1838 .shutdown = vsock_shutdown,
1839 .setsockopt = vsock_stream_setsockopt,
1840 .getsockopt = vsock_stream_getsockopt,
1841 .sendmsg = vsock_stream_sendmsg,
1842 .recvmsg = vsock_stream_recvmsg,
1843 .mmap = sock_no_mmap,
1844 .sendpage = sock_no_sendpage,
1845};
1846
1847static int vsock_create(struct net *net, struct socket *sock,
1848 int protocol, int kern)
1849{
1850 if (!sock)
1851 return -EINVAL;
1852
Andy King6cf1c5f2013-02-18 06:04:13 +00001853 if (protocol && protocol != PF_VSOCK)
Andy Kingd021c342013-02-06 14:23:56 +00001854 return -EPROTONOSUPPORT;
1855
1856 switch (sock->type) {
1857 case SOCK_DGRAM:
1858 sock->ops = &vsock_dgram_ops;
1859 break;
1860 case SOCK_STREAM:
1861 sock->ops = &vsock_stream_ops;
1862 break;
1863 default:
1864 return -ESOCKTNOSUPPORT;
1865 }
1866
1867 sock->state = SS_UNCONNECTED;
1868
Eric W. Biederman11aa9c22015-05-08 21:09:13 -05001869 return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM;
Andy Kingd021c342013-02-06 14:23:56 +00001870}
1871
1872static const struct net_proto_family vsock_family_ops = {
1873 .family = AF_VSOCK,
1874 .create = vsock_create,
1875 .owner = THIS_MODULE,
1876};
1877
1878static long vsock_dev_do_ioctl(struct file *filp,
1879 unsigned int cmd, void __user *ptr)
1880{
1881 u32 __user *p = ptr;
1882 int retval = 0;
1883
1884 switch (cmd) {
1885 case IOCTL_VM_SOCKETS_GET_LOCAL_CID:
1886 if (put_user(transport->get_local_cid(), p) != 0)
1887 retval = -EFAULT;
1888 break;
1889
1890 default:
1891 pr_err("Unknown ioctl %d\n", cmd);
1892 retval = -EINVAL;
1893 }
1894
1895 return retval;
1896}
1897
1898static long vsock_dev_ioctl(struct file *filp,
1899 unsigned int cmd, unsigned long arg)
1900{
1901 return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg);
1902}
1903
1904#ifdef CONFIG_COMPAT
1905static long vsock_dev_compat_ioctl(struct file *filp,
1906 unsigned int cmd, unsigned long arg)
1907{
1908 return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg));
1909}
1910#endif
1911
1912static const struct file_operations vsock_device_ops = {
1913 .owner = THIS_MODULE,
1914 .unlocked_ioctl = vsock_dev_ioctl,
1915#ifdef CONFIG_COMPAT
1916 .compat_ioctl = vsock_dev_compat_ioctl,
1917#endif
1918 .open = nonseekable_open,
1919};
1920
1921static struct miscdevice vsock_device = {
1922 .name = "vsock",
Andy Kingd021c342013-02-06 14:23:56 +00001923 .fops = &vsock_device_ops,
1924};
1925
Andy King2c4a3362014-05-01 15:20:43 -07001926int __vsock_core_init(const struct vsock_transport *t, struct module *owner)
Andy Kingd021c342013-02-06 14:23:56 +00001927{
Andy King2c4a3362014-05-01 15:20:43 -07001928 int err = mutex_lock_interruptible(&vsock_register_mutex);
1929
1930 if (err)
1931 return err;
1932
1933 if (transport) {
1934 err = -EBUSY;
1935 goto err_busy;
1936 }
1937
1938 /* Transport must be the owner of the protocol so that it can't
1939 * unload while there are open sockets.
1940 */
1941 vsock_proto.owner = owner;
1942 transport = t;
Andy Kingd021c342013-02-06 14:23:56 +00001943
1944 vsock_init_tables();
1945
Asias He6ad0b2f2013-04-23 20:33:52 +00001946 vsock_device.minor = MISC_DYNAMIC_MINOR;
Andy Kingd021c342013-02-06 14:23:56 +00001947 err = misc_register(&vsock_device);
1948 if (err) {
1949 pr_err("Failed to register misc device\n");
Gao fengf6a835b2015-10-18 23:35:56 +08001950 goto err_reset_transport;
Andy Kingd021c342013-02-06 14:23:56 +00001951 }
1952
1953 err = proto_register(&vsock_proto, 1); /* we want our slab */
1954 if (err) {
1955 pr_err("Cannot register vsock protocol\n");
Gao fengf6a835b2015-10-18 23:35:56 +08001956 goto err_deregister_misc;
Andy Kingd021c342013-02-06 14:23:56 +00001957 }
1958
1959 err = sock_register(&vsock_family_ops);
1960 if (err) {
1961 pr_err("could not register af_vsock (%d) address family: %d\n",
1962 AF_VSOCK, err);
1963 goto err_unregister_proto;
1964 }
1965
Andy King2c4a3362014-05-01 15:20:43 -07001966 mutex_unlock(&vsock_register_mutex);
Andy Kingd021c342013-02-06 14:23:56 +00001967 return 0;
1968
1969err_unregister_proto:
1970 proto_unregister(&vsock_proto);
Gao fengf6a835b2015-10-18 23:35:56 +08001971err_deregister_misc:
Andy Kingd021c342013-02-06 14:23:56 +00001972 misc_deregister(&vsock_device);
Gao fengf6a835b2015-10-18 23:35:56 +08001973err_reset_transport:
Andy King2c4a3362014-05-01 15:20:43 -07001974 transport = NULL;
1975err_busy:
1976 mutex_unlock(&vsock_register_mutex);
Andy Kingd021c342013-02-06 14:23:56 +00001977 return err;
1978}
Andy King2c4a3362014-05-01 15:20:43 -07001979EXPORT_SYMBOL_GPL(__vsock_core_init);
Andy Kingd021c342013-02-06 14:23:56 +00001980
1981void vsock_core_exit(void)
1982{
1983 mutex_lock(&vsock_register_mutex);
1984
1985 misc_deregister(&vsock_device);
1986 sock_unregister(AF_VSOCK);
1987 proto_unregister(&vsock_proto);
1988
1989 /* We do not want the assignment below re-ordered. */
1990 mb();
1991 transport = NULL;
1992
1993 mutex_unlock(&vsock_register_mutex);
1994}
1995EXPORT_SYMBOL_GPL(vsock_core_exit);
1996
1997MODULE_AUTHOR("VMware, Inc.");
1998MODULE_DESCRIPTION("VMware Virtual Socket Family");
Andy King2c4a3362014-05-01 15:20:43 -07001999MODULE_VERSION("1.0.1.0-k");
Andy Kingd021c342013-02-06 14:23:56 +00002000MODULE_LICENSE("GPL v2");