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-rw-r--r--net/vmw_vsock/af_vsock.c2012
1 files changed, 2012 insertions, 0 deletions
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
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index 000000000000..ca511c4f388a
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+++ b/net/vmw_vsock/af_vsock.c
@@ -0,0 +1,2012 @@
1/*
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
39 * implementation because they are in the SS_LISTEN state. When a connection
40 * request is received (the second kind of socket mentioned above), we create a
41 * new socket and refer to it as a pending socket. These pending sockets are
42 * placed on the pending connection list of the listener socket. When future
43 * packets are received for the address the listener socket is bound to, we
44 * check if the source of the packet is from one that has an existing pending
45 * connection. If it does, we process the packet for the pending socket. When
46 * that socket reaches the connected state, it is removed from the listener
47 * socket's pending list and enqueued in the listener socket's accept queue.
48 * Callers of accept(2) will accept connected sockets from the listener socket's
49 * accept queue. If the socket cannot be accepted for some reason then it is
50 * marked rejected. Once the connection is accepted, it is owned by the user
51 * process and the responsibility for cleanup falls with that user process.
52 *
53 * - It is possible that these pending sockets will never reach the connected
54 * state; in fact, we may never receive another packet after the connection
55 * request. Because of this, we must schedule a cleanup function to run in the
56 * future, after some amount of time passes where a connection should have been
57 * established. This function ensures that the socket is off all lists so it
58 * cannot be retrieved, then drops all references to the socket so it is cleaned
59 * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this
60 * function will also cleanup rejected sockets, those that reach the connected
61 * state but leave it before they have been accepted.
62 *
63 * - Sockets created by user action will be cleaned up when the user process
64 * calls close(2), causing our release implementation to be called. Our release
65 * implementation will perform some cleanup then drop the last reference so our
66 * sk_destruct implementation is invoked. Our sk_destruct implementation will
67 * perform additional cleanup that's common for both types of sockets.
68 *
69 * - A socket's reference count is what ensures that the structure won't be
70 * freed. Each entry in a list (such as the "global" bound and connected tables
71 * and the listener socket's pending list and connected queue) ensures a
72 * reference. When we defer work until process context and pass a socket as our
73 * argument, we must ensure the reference count is increased to ensure the
74 * socket isn't freed before the function is run; the deferred function will
75 * then drop the reference.
76 */
77
78#include <linux/types.h>
79#include <linux/bitops.h>
80#include <linux/cred.h>
81#include <linux/init.h>
82#include <linux/io.h>
83#include <linux/kernel.h>
84#include <linux/kmod.h>
85#include <linux/list.h>
86#include <linux/miscdevice.h>
87#include <linux/module.h>
88#include <linux/mutex.h>
89#include <linux/net.h>
90#include <linux/poll.h>
91#include <linux/skbuff.h>
92#include <linux/smp.h>
93#include <linux/socket.h>
94#include <linux/stddef.h>
95#include <linux/unistd.h>
96#include <linux/wait.h>
97#include <linux/workqueue.h>
98#include <net/sock.h>
99
100#include "af_vsock.h"
101
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
118#define SS_LISTEN 255
119
120static const struct vsock_transport *transport;
121static DEFINE_MUTEX(vsock_register_mutex);
122
123/**** EXPORTS ****/
124
125/* Get the ID of the local context. This is transport dependent. */
126
127int vm_sockets_get_local_cid(void)
128{
129 return transport->get_local_cid();
130}
131EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid);
132
133/**** UTILS ****/
134
135/* Each bound VSocket is stored in the bind hash table and each connected
136 * VSocket is stored in the connected hash table.
137 *
138 * Unbound sockets are all put on the same list attached to the end of the hash
139 * table (vsock_unbound_sockets). Bound sockets are added to the hash table in
140 * the bucket that their local address hashes to (vsock_bound_sockets(addr)
141 * represents the list that addr hashes to).
142 *
143 * Specifically, we initialize the vsock_bind_table array to a size of
144 * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through
145 * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and
146 * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function
147 * mods with VSOCK_HASH_SIZE - 1 to ensure this.
148 */
149#define VSOCK_HASH_SIZE 251
150#define MAX_PORT_RETRIES 24
151
152#define VSOCK_HASH(addr) ((addr)->svm_port % (VSOCK_HASH_SIZE - 1))
153#define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)])
154#define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE])
155
156/* XXX This can probably be implemented in a better way. */
157#define VSOCK_CONN_HASH(src, dst) \
158 (((src)->svm_cid ^ (dst)->svm_port) % (VSOCK_HASH_SIZE - 1))
159#define vsock_connected_sockets(src, dst) \
160 (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)])
161#define vsock_connected_sockets_vsk(vsk) \
162 vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr)
163
164static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1];
165static struct list_head vsock_connected_table[VSOCK_HASH_SIZE];
166static DEFINE_SPINLOCK(vsock_table_lock);
167
168static __init void vsock_init_tables(void)
169{
170 int i;
171
172 for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++)
173 INIT_LIST_HEAD(&vsock_bind_table[i]);
174
175 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++)
176 INIT_LIST_HEAD(&vsock_connected_table[i]);
177}
178
179static void __vsock_insert_bound(struct list_head *list,
180 struct vsock_sock *vsk)
181{
182 sock_hold(&vsk->sk);
183 list_add(&vsk->bound_table, list);
184}
185
186static void __vsock_insert_connected(struct list_head *list,
187 struct vsock_sock *vsk)
188{
189 sock_hold(&vsk->sk);
190 list_add(&vsk->connected_table, list);
191}
192
193static void __vsock_remove_bound(struct vsock_sock *vsk)
194{
195 list_del_init(&vsk->bound_table);
196 sock_put(&vsk->sk);
197}
198
199static void __vsock_remove_connected(struct vsock_sock *vsk)
200{
201 list_del_init(&vsk->connected_table);
202 sock_put(&vsk->sk);
203}
204
205static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr)
206{
207 struct vsock_sock *vsk;
208
209 list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table)
210 if (vsock_addr_equals_addr_any(addr, &vsk->local_addr))
211 return sk_vsock(vsk);
212
213 return NULL;
214}
215
216static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src,
217 struct sockaddr_vm *dst)
218{
219 struct vsock_sock *vsk;
220
221 list_for_each_entry(vsk, vsock_connected_sockets(src, dst),
222 connected_table) {
223 if (vsock_addr_equals_addr(src, &vsk->remote_addr)
224 && vsock_addr_equals_addr(dst, &vsk->local_addr)) {
225 return sk_vsock(vsk);
226 }
227 }
228
229 return NULL;
230}
231
232static bool __vsock_in_bound_table(struct vsock_sock *vsk)
233{
234 return !list_empty(&vsk->bound_table);
235}
236
237static bool __vsock_in_connected_table(struct vsock_sock *vsk)
238{
239 return !list_empty(&vsk->connected_table);
240}
241
242static void vsock_insert_unbound(struct vsock_sock *vsk)
243{
244 spin_lock_bh(&vsock_table_lock);
245 __vsock_insert_bound(vsock_unbound_sockets, vsk);
246 spin_unlock_bh(&vsock_table_lock);
247}
248
249void vsock_insert_connected(struct vsock_sock *vsk)
250{
251 struct list_head *list = vsock_connected_sockets(
252 &vsk->remote_addr, &vsk->local_addr);
253
254 spin_lock_bh(&vsock_table_lock);
255 __vsock_insert_connected(list, vsk);
256 spin_unlock_bh(&vsock_table_lock);
257}
258EXPORT_SYMBOL_GPL(vsock_insert_connected);
259
260void vsock_remove_bound(struct vsock_sock *vsk)
261{
262 spin_lock_bh(&vsock_table_lock);
263 __vsock_remove_bound(vsk);
264 spin_unlock_bh(&vsock_table_lock);
265}
266EXPORT_SYMBOL_GPL(vsock_remove_bound);
267
268void vsock_remove_connected(struct vsock_sock *vsk)
269{
270 spin_lock_bh(&vsock_table_lock);
271 __vsock_remove_connected(vsk);
272 spin_unlock_bh(&vsock_table_lock);
273}
274EXPORT_SYMBOL_GPL(vsock_remove_connected);
275
276struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr)
277{
278 struct sock *sk;
279
280 spin_lock_bh(&vsock_table_lock);
281 sk = __vsock_find_bound_socket(addr);
282 if (sk)
283 sock_hold(sk);
284
285 spin_unlock_bh(&vsock_table_lock);
286
287 return sk;
288}
289EXPORT_SYMBOL_GPL(vsock_find_bound_socket);
290
291struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
292 struct sockaddr_vm *dst)
293{
294 struct sock *sk;
295
296 spin_lock_bh(&vsock_table_lock);
297 sk = __vsock_find_connected_socket(src, dst);
298 if (sk)
299 sock_hold(sk);
300
301 spin_unlock_bh(&vsock_table_lock);
302
303 return sk;
304}
305EXPORT_SYMBOL_GPL(vsock_find_connected_socket);
306
307static bool vsock_in_bound_table(struct vsock_sock *vsk)
308{
309 bool ret;
310
311 spin_lock_bh(&vsock_table_lock);
312 ret = __vsock_in_bound_table(vsk);
313 spin_unlock_bh(&vsock_table_lock);
314
315 return ret;
316}
317
318static bool vsock_in_connected_table(struct vsock_sock *vsk)
319{
320 bool ret;
321
322 spin_lock_bh(&vsock_table_lock);
323 ret = __vsock_in_connected_table(vsk);
324 spin_unlock_bh(&vsock_table_lock);
325
326 return ret;
327}
328
329void vsock_for_each_connected_socket(void (*fn)(struct sock *sk))
330{
331 int i;
332
333 spin_lock_bh(&vsock_table_lock);
334
335 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) {
336 struct vsock_sock *vsk;
337 list_for_each_entry(vsk, &vsock_connected_table[i],
338 connected_table);
339 fn(sk_vsock(vsk));
340 }
341
342 spin_unlock_bh(&vsock_table_lock);
343}
344EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket);
345
346void vsock_add_pending(struct sock *listener, struct sock *pending)
347{
348 struct vsock_sock *vlistener;
349 struct vsock_sock *vpending;
350
351 vlistener = vsock_sk(listener);
352 vpending = vsock_sk(pending);
353
354 sock_hold(pending);
355 sock_hold(listener);
356 list_add_tail(&vpending->pending_links, &vlistener->pending_links);
357}
358EXPORT_SYMBOL_GPL(vsock_add_pending);
359
360void vsock_remove_pending(struct sock *listener, struct sock *pending)
361{
362 struct vsock_sock *vpending = vsock_sk(pending);
363
364 list_del_init(&vpending->pending_links);
365 sock_put(listener);
366 sock_put(pending);
367}
368EXPORT_SYMBOL_GPL(vsock_remove_pending);
369
370void vsock_enqueue_accept(struct sock *listener, struct sock *connected)
371{
372 struct vsock_sock *vlistener;
373 struct vsock_sock *vconnected;
374
375 vlistener = vsock_sk(listener);
376 vconnected = vsock_sk(connected);
377
378 sock_hold(connected);
379 sock_hold(listener);
380 list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue);
381}
382EXPORT_SYMBOL_GPL(vsock_enqueue_accept);
383
384static struct sock *vsock_dequeue_accept(struct sock *listener)
385{
386 struct vsock_sock *vlistener;
387 struct vsock_sock *vconnected;
388
389 vlistener = vsock_sk(listener);
390
391 if (list_empty(&vlistener->accept_queue))
392 return NULL;
393
394 vconnected = list_entry(vlistener->accept_queue.next,
395 struct vsock_sock, accept_queue);
396
397 list_del_init(&vconnected->accept_queue);
398 sock_put(listener);
399 /* The caller will need a reference on the connected socket so we let
400 * it call sock_put().
401 */
402
403 return sk_vsock(vconnected);
404}
405
406static bool vsock_is_accept_queue_empty(struct sock *sk)
407{
408 struct vsock_sock *vsk = vsock_sk(sk);
409 return list_empty(&vsk->accept_queue);
410}
411
412static bool vsock_is_pending(struct sock *sk)
413{
414 struct vsock_sock *vsk = vsock_sk(sk);
415 return !list_empty(&vsk->pending_links);
416}
417
418static int vsock_send_shutdown(struct sock *sk, int mode)
419{
420 return transport->shutdown(vsock_sk(sk), mode);
421}
422
423void vsock_pending_work(struct work_struct *work)
424{
425 struct sock *sk;
426 struct sock *listener;
427 struct vsock_sock *vsk;
428 bool cleanup;
429
430 vsk = container_of(work, struct vsock_sock, dwork.work);
431 sk = sk_vsock(vsk);
432 listener = vsk->listener;
433 cleanup = true;
434
435 lock_sock(listener);
436 lock_sock(sk);
437
438 if (vsock_is_pending(sk)) {
439 vsock_remove_pending(listener, sk);
440 } else if (!vsk->rejected) {
441 /* We are not on the pending list and accept() did not reject
442 * us, so we must have been accepted by our user process. We
443 * just need to drop our references to the sockets and be on
444 * our way.
445 */
446 cleanup = false;
447 goto out;
448 }
449
450 listener->sk_ack_backlog--;
451
452 /* We need to remove ourself from the global connected sockets list so
453 * incoming packets can't find this socket, and to reduce the reference
454 * count.
455 */
456 if (vsock_in_connected_table(vsk))
457 vsock_remove_connected(vsk);
458
459 sk->sk_state = SS_FREE;
460
461out:
462 release_sock(sk);
463 release_sock(listener);
464 if (cleanup)
465 sock_put(sk);
466
467 sock_put(sk);
468 sock_put(listener);
469}
470EXPORT_SYMBOL_GPL(vsock_pending_work);
471
472/**** SOCKET OPERATIONS ****/
473
474static int __vsock_bind_stream(struct vsock_sock *vsk,
475 struct sockaddr_vm *addr)
476{
477 static u32 port = LAST_RESERVED_PORT + 1;
478 struct sockaddr_vm new_addr;
479
480 vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port);
481
482 if (addr->svm_port == VMADDR_PORT_ANY) {
483 bool found = false;
484 unsigned int i;
485
486 for (i = 0; i < MAX_PORT_RETRIES; i++) {
487 if (port <= LAST_RESERVED_PORT)
488 port = LAST_RESERVED_PORT + 1;
489
490 new_addr.svm_port = port++;
491
492 if (!__vsock_find_bound_socket(&new_addr)) {
493 found = true;
494 break;
495 }
496 }
497
498 if (!found)
499 return -EADDRNOTAVAIL;
500 } else {
501 /* If port is in reserved range, ensure caller
502 * has necessary privileges.
503 */
504 if (addr->svm_port <= LAST_RESERVED_PORT &&
505 !capable(CAP_NET_BIND_SERVICE)) {
506 return -EACCES;
507 }
508
509 if (__vsock_find_bound_socket(&new_addr))
510 return -EADDRINUSE;
511 }
512
513 vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port);
514
515 /* Remove stream sockets from the unbound list and add them to the hash
516 * table for easy lookup by its address. The unbound list is simply an
517 * extra entry at the end of the hash table, a trick used by AF_UNIX.
518 */
519 __vsock_remove_bound(vsk);
520 __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk);
521
522 return 0;
523}
524
525static int __vsock_bind_dgram(struct vsock_sock *vsk,
526 struct sockaddr_vm *addr)
527{
528 return transport->dgram_bind(vsk, addr);
529}
530
531static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr)
532{
533 struct vsock_sock *vsk = vsock_sk(sk);
534 u32 cid;
535 int retval;
536
537 /* First ensure this socket isn't already bound. */
538 if (vsock_addr_bound(&vsk->local_addr))
539 return -EINVAL;
540
541 /* Now bind to the provided address or select appropriate values if
542 * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that
543 * like AF_INET prevents binding to a non-local IP address (in most
544 * cases), we only allow binding to the local CID.
545 */
546 cid = transport->get_local_cid();
547 if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY)
548 return -EADDRNOTAVAIL;
549
550 switch (sk->sk_socket->type) {
551 case SOCK_STREAM:
552 spin_lock_bh(&vsock_table_lock);
553 retval = __vsock_bind_stream(vsk, addr);
554 spin_unlock_bh(&vsock_table_lock);
555 break;
556
557 case SOCK_DGRAM:
558 retval = __vsock_bind_dgram(vsk, addr);
559 break;
560
561 default:
562 retval = -EINVAL;
563 break;
564 }
565
566 return retval;
567}
568
569struct sock *__vsock_create(struct net *net,
570 struct socket *sock,
571 struct sock *parent,
572 gfp_t priority,
573 unsigned short type)
574{
575 struct sock *sk;
576 struct vsock_sock *psk;
577 struct vsock_sock *vsk;
578
579 sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto);
580 if (!sk)
581 return NULL;
582
583 sock_init_data(sock, sk);
584
585 /* sk->sk_type is normally set in sock_init_data, but only if sock is
586 * non-NULL. We make sure that our sockets always have a type by
587 * setting it here if needed.
588 */
589 if (!sock)
590 sk->sk_type = type;
591
592 vsk = vsock_sk(sk);
593 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
594 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
595
596 sk->sk_destruct = vsock_sk_destruct;
597 sk->sk_backlog_rcv = vsock_queue_rcv_skb;
598 sk->sk_state = 0;
599 sock_reset_flag(sk, SOCK_DONE);
600
601 INIT_LIST_HEAD(&vsk->bound_table);
602 INIT_LIST_HEAD(&vsk->connected_table);
603 vsk->listener = NULL;
604 INIT_LIST_HEAD(&vsk->pending_links);
605 INIT_LIST_HEAD(&vsk->accept_queue);
606 vsk->rejected = false;
607 vsk->sent_request = false;
608 vsk->ignore_connecting_rst = false;
609 vsk->peer_shutdown = 0;
610
611 psk = parent ? vsock_sk(parent) : NULL;
612 if (parent) {
613 vsk->trusted = psk->trusted;
614 vsk->owner = get_cred(psk->owner);
615 vsk->connect_timeout = psk->connect_timeout;
616 } else {
617 vsk->trusted = capable(CAP_NET_ADMIN);
618 vsk->owner = get_current_cred();
619 vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT;
620 }
621
622 if (transport->init(vsk, psk) < 0) {
623 sk_free(sk);
624 return NULL;
625 }
626
627 if (sock)
628 vsock_insert_unbound(vsk);
629
630 return sk;
631}
632EXPORT_SYMBOL_GPL(__vsock_create);
633
634static void __vsock_release(struct sock *sk)
635{
636 if (sk) {
637 struct sk_buff *skb;
638 struct sock *pending;
639 struct vsock_sock *vsk;
640
641 vsk = vsock_sk(sk);
642 pending = NULL; /* Compiler warning. */
643
644 if (vsock_in_bound_table(vsk))
645 vsock_remove_bound(vsk);
646
647 if (vsock_in_connected_table(vsk))
648 vsock_remove_connected(vsk);
649
650 transport->release(vsk);
651
652 lock_sock(sk);
653 sock_orphan(sk);
654 sk->sk_shutdown = SHUTDOWN_MASK;
655
656 while ((skb = skb_dequeue(&sk->sk_receive_queue)))
657 kfree_skb(skb);
658
659 /* Clean up any sockets that never were accepted. */
660 while ((pending = vsock_dequeue_accept(sk)) != NULL) {
661 __vsock_release(pending);
662 sock_put(pending);
663 }
664
665 release_sock(sk);
666 sock_put(sk);
667 }
668}
669
670static void vsock_sk_destruct(struct sock *sk)
671{
672 struct vsock_sock *vsk = vsock_sk(sk);
673
674 transport->destruct(vsk);
675
676 /* When clearing these addresses, there's no need to set the family and
677 * possibly register the address family with the kernel.
678 */
679 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
680 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
681
682 put_cred(vsk->owner);
683}
684
685static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
686{
687 int err;
688
689 err = sock_queue_rcv_skb(sk, skb);
690 if (err)
691 kfree_skb(skb);
692
693 return err;
694}
695
696s64 vsock_stream_has_data(struct vsock_sock *vsk)
697{
698 return transport->stream_has_data(vsk);
699}
700EXPORT_SYMBOL_GPL(vsock_stream_has_data);
701
702s64 vsock_stream_has_space(struct vsock_sock *vsk)
703{
704 return transport->stream_has_space(vsk);
705}
706EXPORT_SYMBOL_GPL(vsock_stream_has_space);
707
708static int vsock_release(struct socket *sock)
709{
710 __vsock_release(sock->sk);
711 sock->sk = NULL;
712 sock->state = SS_FREE;
713
714 return 0;
715}
716
717static int
718vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
719{
720 int err;
721 struct sock *sk;
722 struct sockaddr_vm *vm_addr;
723
724 sk = sock->sk;
725
726 if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0)
727 return -EINVAL;
728
729 lock_sock(sk);
730 err = __vsock_bind(sk, vm_addr);
731 release_sock(sk);
732
733 return err;
734}
735
736static int vsock_getname(struct socket *sock,
737 struct sockaddr *addr, int *addr_len, int peer)
738{
739 int err;
740 struct sock *sk;
741 struct vsock_sock *vsk;
742 struct sockaddr_vm *vm_addr;
743
744 sk = sock->sk;
745 vsk = vsock_sk(sk);
746 err = 0;
747
748 lock_sock(sk);
749
750 if (peer) {
751 if (sock->state != SS_CONNECTED) {
752 err = -ENOTCONN;
753 goto out;
754 }
755 vm_addr = &vsk->remote_addr;
756 } else {
757 vm_addr = &vsk->local_addr;
758 }
759
760 if (!vm_addr) {
761 err = -EINVAL;
762 goto out;
763 }
764
765 /* sys_getsockname() and sys_getpeername() pass us a
766 * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately
767 * that macro is defined in socket.c instead of .h, so we hardcode its
768 * value here.
769 */
770 BUILD_BUG_ON(sizeof(*vm_addr) > 128);
771 memcpy(addr, vm_addr, sizeof(*vm_addr));
772 *addr_len = sizeof(*vm_addr);
773
774out:
775 release_sock(sk);
776 return err;
777}
778
779static int vsock_shutdown(struct socket *sock, int mode)
780{
781 int err;
782 struct sock *sk;
783
784 /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses
785 * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode
786 * here like the other address families do. Note also that the
787 * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3),
788 * which is what we want.
789 */
790 mode++;
791
792 if ((mode & ~SHUTDOWN_MASK) || !mode)
793 return -EINVAL;
794
795 /* If this is a STREAM socket and it is not connected then bail out
796 * immediately. If it is a DGRAM socket then we must first kick the
797 * socket so that it wakes up from any sleeping calls, for example
798 * recv(), and then afterwards return the error.
799 */
800
801 sk = sock->sk;
802 if (sock->state == SS_UNCONNECTED) {
803 err = -ENOTCONN;
804 if (sk->sk_type == SOCK_STREAM)
805 return err;
806 } else {
807 sock->state = SS_DISCONNECTING;
808 err = 0;
809 }
810
811 /* Receive and send shutdowns are treated alike. */
812 mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN);
813 if (mode) {
814 lock_sock(sk);
815 sk->sk_shutdown |= mode;
816 sk->sk_state_change(sk);
817 release_sock(sk);
818
819 if (sk->sk_type == SOCK_STREAM) {
820 sock_reset_flag(sk, SOCK_DONE);
821 vsock_send_shutdown(sk, mode);
822 }
823 }
824
825 return err;
826}
827
828static unsigned int vsock_poll(struct file *file, struct socket *sock,
829 poll_table *wait)
830{
831 struct sock *sk;
832 unsigned int mask;
833 struct vsock_sock *vsk;
834
835 sk = sock->sk;
836 vsk = vsock_sk(sk);
837
838 poll_wait(file, sk_sleep(sk), wait);
839 mask = 0;
840
841 if (sk->sk_err)
842 /* Signify that there has been an error on this socket. */
843 mask |= POLLERR;
844
845 /* INET sockets treat local write shutdown and peer write shutdown as a
846 * case of POLLHUP set.
847 */
848 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
849 ((sk->sk_shutdown & SEND_SHUTDOWN) &&
850 (vsk->peer_shutdown & SEND_SHUTDOWN))) {
851 mask |= POLLHUP;
852 }
853
854 if (sk->sk_shutdown & RCV_SHUTDOWN ||
855 vsk->peer_shutdown & SEND_SHUTDOWN) {
856 mask |= POLLRDHUP;
857 }
858
859 if (sock->type == SOCK_DGRAM) {
860 /* For datagram sockets we can read if there is something in
861 * the queue and write as long as the socket isn't shutdown for
862 * sending.
863 */
864 if (!skb_queue_empty(&sk->sk_receive_queue) ||
865 (sk->sk_shutdown & RCV_SHUTDOWN)) {
866 mask |= POLLIN | POLLRDNORM;
867 }
868
869 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
870 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
871
872 } else if (sock->type == SOCK_STREAM) {
873 lock_sock(sk);
874
875 /* Listening sockets that have connections in their accept
876 * queue can be read.
877 */
878 if (sk->sk_state == SS_LISTEN
879 && !vsock_is_accept_queue_empty(sk))
880 mask |= POLLIN | POLLRDNORM;
881
882 /* If there is something in the queue then we can read. */
883 if (transport->stream_is_active(vsk) &&
884 !(sk->sk_shutdown & RCV_SHUTDOWN)) {
885 bool data_ready_now = false;
886 int ret = transport->notify_poll_in(
887 vsk, 1, &data_ready_now);
888 if (ret < 0) {
889 mask |= POLLERR;
890 } else {
891 if (data_ready_now)
892 mask |= POLLIN | POLLRDNORM;
893
894 }
895 }
896
897 /* Sockets whose connections have been closed, reset, or
898 * terminated should also be considered read, and we check the
899 * shutdown flag for that.
900 */
901 if (sk->sk_shutdown & RCV_SHUTDOWN ||
902 vsk->peer_shutdown & SEND_SHUTDOWN) {
903 mask |= POLLIN | POLLRDNORM;
904 }
905
906 /* Connected sockets that can produce data can be written. */
907 if (sk->sk_state == SS_CONNECTED) {
908 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
909 bool space_avail_now = false;
910 int ret = transport->notify_poll_out(
911 vsk, 1, &space_avail_now);
912 if (ret < 0) {
913 mask |= POLLERR;
914 } else {
915 if (space_avail_now)
916 /* Remove POLLWRBAND since INET
917 * sockets are not setting it.
918 */
919 mask |= POLLOUT | POLLWRNORM;
920
921 }
922 }
923 }
924
925 /* Simulate INET socket poll behaviors, which sets
926 * POLLOUT|POLLWRNORM when peer is closed and nothing to read,
927 * but local send is not shutdown.
928 */
929 if (sk->sk_state == SS_UNCONNECTED) {
930 if (!(sk->sk_shutdown & SEND_SHUTDOWN))
931 mask |= POLLOUT | POLLWRNORM;
932
933 }
934
935 release_sock(sk);
936 }
937
938 return mask;
939}
940
941static int vsock_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
942 struct msghdr *msg, size_t len)
943{
944 int err;
945 struct sock *sk;
946 struct vsock_sock *vsk;
947 struct sockaddr_vm *remote_addr;
948
949 if (msg->msg_flags & MSG_OOB)
950 return -EOPNOTSUPP;
951
952 /* For now, MSG_DONTWAIT is always assumed... */
953 err = 0;
954 sk = sock->sk;
955 vsk = vsock_sk(sk);
956
957 lock_sock(sk);
958
959 if (!vsock_addr_bound(&vsk->local_addr)) {
960 struct sockaddr_vm local_addr;
961
962 vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
963 err = __vsock_bind(sk, &local_addr);
964 if (err != 0)
965 goto out;
966
967 }
968
969 /* If the provided message contains an address, use that. Otherwise
970 * fall back on the socket's remote handle (if it has been connected).
971 */
972 if (msg->msg_name &&
973 vsock_addr_cast(msg->msg_name, msg->msg_namelen,
974 &remote_addr) == 0) {
975 /* Ensure this address is of the right type and is a valid
976 * destination.
977 */
978
979 if (remote_addr->svm_cid == VMADDR_CID_ANY)
980 remote_addr->svm_cid = transport->get_local_cid();
981
982 if (!vsock_addr_bound(remote_addr)) {
983 err = -EINVAL;
984 goto out;
985 }
986 } else if (sock->state == SS_CONNECTED) {
987 remote_addr = &vsk->remote_addr;
988
989 if (remote_addr->svm_cid == VMADDR_CID_ANY)
990 remote_addr->svm_cid = transport->get_local_cid();
991
992 /* XXX Should connect() or this function ensure remote_addr is
993 * bound?
994 */
995 if (!vsock_addr_bound(&vsk->remote_addr)) {
996 err = -EINVAL;
997 goto out;
998 }
999 } else {
1000 err = -EINVAL;
1001 goto out;
1002 }
1003
1004 if (!transport->dgram_allow(remote_addr->svm_cid,
1005 remote_addr->svm_port)) {
1006 err = -EINVAL;
1007 goto out;
1008 }
1009
1010 err = transport->dgram_enqueue(vsk, remote_addr, msg->msg_iov, len);
1011
1012out:
1013 release_sock(sk);
1014 return err;
1015}
1016
1017static int vsock_dgram_connect(struct socket *sock,
1018 struct sockaddr *addr, int addr_len, int flags)
1019{
1020 int err;
1021 struct sock *sk;
1022 struct vsock_sock *vsk;
1023 struct sockaddr_vm *remote_addr;
1024
1025 sk = sock->sk;
1026 vsk = vsock_sk(sk);
1027
1028 err = vsock_addr_cast(addr, addr_len, &remote_addr);
1029 if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) {
1030 lock_sock(sk);
1031 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY,
1032 VMADDR_PORT_ANY);
1033 sock->state = SS_UNCONNECTED;
1034 release_sock(sk);
1035 return 0;
1036 } else if (err != 0)
1037 return -EINVAL;
1038
1039 lock_sock(sk);
1040
1041 if (!vsock_addr_bound(&vsk->local_addr)) {
1042 struct sockaddr_vm local_addr;
1043
1044 vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY);
1045 err = __vsock_bind(sk, &local_addr);
1046 if (err != 0)
1047 goto out;
1048
1049 }
1050
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
1065static int vsock_dgram_recvmsg(struct kiocb *kiocb, struct socket *sock,
1066 struct msghdr *msg, size_t len, int flags)
1067{
1068 return transport->dgram_dequeue(kiocb, vsock_sk(sock->sk), msg, len,
1069 flags);
1070}
1071
1072static const struct proto_ops vsock_dgram_ops = {
1073 .family = PF_VSOCK,
1074 .owner = THIS_MODULE,
1075 .release = vsock_release,
1076 .bind = vsock_bind,
1077 .connect = vsock_dgram_connect,
1078 .socketpair = sock_no_socketpair,
1079 .accept = sock_no_accept,
1080 .getname = vsock_getname,
1081 .poll = vsock_poll,
1082 .ioctl = sock_no_ioctl,
1083 .listen = sock_no_listen,
1084 .shutdown = vsock_shutdown,
1085 .setsockopt = sock_no_setsockopt,
1086 .getsockopt = sock_no_getsockopt,
1087 .sendmsg = vsock_dgram_sendmsg,
1088 .recvmsg = vsock_dgram_recvmsg,
1089 .mmap = sock_no_mmap,
1090 .sendpage = sock_no_sendpage,
1091};
1092
1093static void vsock_connect_timeout(struct work_struct *work)
1094{
1095 struct sock *sk;
1096 struct vsock_sock *vsk;
1097
1098 vsk = container_of(work, struct vsock_sock, dwork.work);
1099 sk = sk_vsock(vsk);
1100
1101 lock_sock(sk);
1102 if (sk->sk_state == SS_CONNECTING &&
1103 (sk->sk_shutdown != SHUTDOWN_MASK)) {
1104 sk->sk_state = SS_UNCONNECTED;
1105 sk->sk_err = ETIMEDOUT;
1106 sk->sk_error_report(sk);
1107 }
1108 release_sock(sk);
1109
1110 sock_put(sk);
1111}
1112
1113static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
1114 int addr_len, int flags)
1115{
1116 int err;
1117 struct sock *sk;
1118 struct vsock_sock *vsk;
1119 struct sockaddr_vm *remote_addr;
1120 long timeout;
1121 DEFINE_WAIT(wait);
1122
1123 err = 0;
1124 sk = sock->sk;
1125 vsk = vsock_sk(sk);
1126
1127 lock_sock(sk);
1128
1129 /* XXX AF_UNSPEC should make us disconnect like AF_INET. */
1130 switch (sock->state) {
1131 case SS_CONNECTED:
1132 err = -EISCONN;
1133 goto out;
1134 case SS_DISCONNECTING:
1135 err = -EINVAL;
1136 goto out;
1137 case SS_CONNECTING:
1138 /* This continues on so we can move sock into the SS_CONNECTED
1139 * state once the connection has completed (at which point err
1140 * will be set to zero also). Otherwise, we will either wait
1141 * for the connection or return -EALREADY should this be a
1142 * non-blocking call.
1143 */
1144 err = -EALREADY;
1145 break;
1146 default:
1147 if ((sk->sk_state == SS_LISTEN) ||
1148 vsock_addr_cast(addr, addr_len, &remote_addr) != 0) {
1149 err = -EINVAL;
1150 goto out;
1151 }
1152
1153 /* The hypervisor and well-known contexts do not have socket
1154 * endpoints.
1155 */
1156 if (!transport->stream_allow(remote_addr->svm_cid,
1157 remote_addr->svm_port)) {
1158 err = -ENETUNREACH;
1159 goto out;
1160 }
1161
1162 /* Set the remote address that we are connecting to. */
1163 memcpy(&vsk->remote_addr, remote_addr,
1164 sizeof(vsk->remote_addr));
1165
1166 /* Autobind this socket to the local address if necessary. */
1167 if (!vsock_addr_bound(&vsk->local_addr)) {
1168 struct sockaddr_vm local_addr;
1169
1170 vsock_addr_init(&local_addr, VMADDR_CID_ANY,
1171 VMADDR_PORT_ANY);
1172 err = __vsock_bind(sk, &local_addr);
1173 if (err != 0)
1174 goto out;
1175
1176 }
1177
1178 sk->sk_state = SS_CONNECTING;
1179
1180 err = transport->connect(vsk);
1181 if (err < 0)
1182 goto out;
1183
1184 /* Mark sock as connecting and set the error code to in
1185 * progress in case this is a non-blocking connect.
1186 */
1187 sock->state = SS_CONNECTING;
1188 err = -EINPROGRESS;
1189 }
1190
1191 /* The receive path will handle all communication until we are able to
1192 * enter the connected state. Here we wait for the connection to be
1193 * completed or a notification of an error.
1194 */
1195 timeout = vsk->connect_timeout;
1196 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1197
1198 while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) {
1199 if (flags & O_NONBLOCK) {
1200 /* If we're not going to block, we schedule a timeout
1201 * function to generate a timeout on the connection
1202 * attempt, in case the peer doesn't respond in a
1203 * timely manner. We hold on to the socket until the
1204 * timeout fires.
1205 */
1206 sock_hold(sk);
1207 INIT_DELAYED_WORK(&vsk->dwork,
1208 vsock_connect_timeout);
1209 schedule_delayed_work(&vsk->dwork, timeout);
1210
1211 /* Skip ahead to preserve error code set above. */
1212 goto out_wait;
1213 }
1214
1215 release_sock(sk);
1216 timeout = schedule_timeout(timeout);
1217 lock_sock(sk);
1218
1219 if (signal_pending(current)) {
1220 err = sock_intr_errno(timeout);
1221 goto out_wait_error;
1222 } else if (timeout == 0) {
1223 err = -ETIMEDOUT;
1224 goto out_wait_error;
1225 }
1226
1227 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1228 }
1229
1230 if (sk->sk_err) {
1231 err = -sk->sk_err;
1232 goto out_wait_error;
1233 } else
1234 err = 0;
1235
1236out_wait:
1237 finish_wait(sk_sleep(sk), &wait);
1238out:
1239 release_sock(sk);
1240 return err;
1241
1242out_wait_error:
1243 sk->sk_state = SS_UNCONNECTED;
1244 sock->state = SS_UNCONNECTED;
1245 goto out_wait;
1246}
1247
1248static int vsock_accept(struct socket *sock, struct socket *newsock, int flags)
1249{
1250 struct sock *listener;
1251 int err;
1252 struct sock *connected;
1253 struct vsock_sock *vconnected;
1254 long timeout;
1255 DEFINE_WAIT(wait);
1256
1257 err = 0;
1258 listener = sock->sk;
1259
1260 lock_sock(listener);
1261
1262 if (sock->type != SOCK_STREAM) {
1263 err = -EOPNOTSUPP;
1264 goto out;
1265 }
1266
1267 if (listener->sk_state != SS_LISTEN) {
1268 err = -EINVAL;
1269 goto out;
1270 }
1271
1272 /* Wait for children sockets to appear; these are the new sockets
1273 * created upon connection establishment.
1274 */
1275 timeout = sock_sndtimeo(listener, flags & O_NONBLOCK);
1276 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1277
1278 while ((connected = vsock_dequeue_accept(listener)) == NULL &&
1279 listener->sk_err == 0) {
1280 release_sock(listener);
1281 timeout = schedule_timeout(timeout);
1282 lock_sock(listener);
1283
1284 if (signal_pending(current)) {
1285 err = sock_intr_errno(timeout);
1286 goto out_wait;
1287 } else if (timeout == 0) {
1288 err = -EAGAIN;
1289 goto out_wait;
1290 }
1291
1292 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE);
1293 }
1294
1295 if (listener->sk_err)
1296 err = -listener->sk_err;
1297
1298 if (connected) {
1299 listener->sk_ack_backlog--;
1300
1301 lock_sock(connected);
1302 vconnected = vsock_sk(connected);
1303
1304 /* If the listener socket has received an error, then we should
1305 * reject this socket and return. Note that we simply mark the
1306 * socket rejected, drop our reference, and let the cleanup
1307 * function handle the cleanup; the fact that we found it in
1308 * the listener's accept queue guarantees that the cleanup
1309 * function hasn't run yet.
1310 */
1311 if (err) {
1312 vconnected->rejected = true;
1313 release_sock(connected);
1314 sock_put(connected);
1315 goto out_wait;
1316 }
1317
1318 newsock->state = SS_CONNECTED;
1319 sock_graft(connected, newsock);
1320 release_sock(connected);
1321 sock_put(connected);
1322 }
1323
1324out_wait:
1325 finish_wait(sk_sleep(listener), &wait);
1326out:
1327 release_sock(listener);
1328 return err;
1329}
1330
1331static int vsock_listen(struct socket *sock, int backlog)
1332{
1333 int err;
1334 struct sock *sk;
1335 struct vsock_sock *vsk;
1336
1337 sk = sock->sk;
1338
1339 lock_sock(sk);
1340
1341 if (sock->type != SOCK_STREAM) {
1342 err = -EOPNOTSUPP;
1343 goto out;
1344 }
1345
1346 if (sock->state != SS_UNCONNECTED) {
1347 err = -EINVAL;
1348 goto out;
1349 }
1350
1351 vsk = vsock_sk(sk);
1352
1353 if (!vsock_addr_bound(&vsk->local_addr)) {
1354 err = -EINVAL;
1355 goto out;
1356 }
1357
1358 sk->sk_max_ack_backlog = backlog;
1359 sk->sk_state = SS_LISTEN;
1360
1361 err = 0;
1362
1363out:
1364 release_sock(sk);
1365 return err;
1366}
1367
1368static int vsock_stream_setsockopt(struct socket *sock,
1369 int level,
1370 int optname,
1371 char __user *optval,
1372 unsigned int optlen)
1373{
1374 int err;
1375 struct sock *sk;
1376 struct vsock_sock *vsk;
1377 u64 val;
1378
1379 if (level != AF_VSOCK)
1380 return -ENOPROTOOPT;
1381
1382#define COPY_IN(_v) \
1383 do { \
1384 if (optlen < sizeof(_v)) { \
1385 err = -EINVAL; \
1386 goto exit; \
1387 } \
1388 if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \
1389 err = -EFAULT; \
1390 goto exit; \
1391 } \
1392 } while (0)
1393
1394 err = 0;
1395 sk = sock->sk;
1396 vsk = vsock_sk(sk);
1397
1398 lock_sock(sk);
1399
1400 switch (optname) {
1401 case SO_VM_SOCKETS_BUFFER_SIZE:
1402 COPY_IN(val);
1403 transport->set_buffer_size(vsk, val);
1404 break;
1405
1406 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1407 COPY_IN(val);
1408 transport->set_max_buffer_size(vsk, val);
1409 break;
1410
1411 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1412 COPY_IN(val);
1413 transport->set_min_buffer_size(vsk, val);
1414 break;
1415
1416 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1417 struct timeval tv;
1418 COPY_IN(tv);
1419 if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC &&
1420 tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) {
1421 vsk->connect_timeout = tv.tv_sec * HZ +
1422 DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ));
1423 if (vsk->connect_timeout == 0)
1424 vsk->connect_timeout =
1425 VSOCK_DEFAULT_CONNECT_TIMEOUT;
1426
1427 } else {
1428 err = -ERANGE;
1429 }
1430 break;
1431 }
1432
1433 default:
1434 err = -ENOPROTOOPT;
1435 break;
1436 }
1437
1438#undef COPY_IN
1439
1440exit:
1441 release_sock(sk);
1442 return err;
1443}
1444
1445static int vsock_stream_getsockopt(struct socket *sock,
1446 int level, int optname,
1447 char __user *optval,
1448 int __user *optlen)
1449{
1450 int err;
1451 int len;
1452 struct sock *sk;
1453 struct vsock_sock *vsk;
1454 u64 val;
1455
1456 if (level != AF_VSOCK)
1457 return -ENOPROTOOPT;
1458
1459 err = get_user(len, optlen);
1460 if (err != 0)
1461 return err;
1462
1463#define COPY_OUT(_v) \
1464 do { \
1465 if (len < sizeof(_v)) \
1466 return -EINVAL; \
1467 \
1468 len = sizeof(_v); \
1469 if (copy_to_user(optval, &_v, len) != 0) \
1470 return -EFAULT; \
1471 \
1472 } while (0)
1473
1474 err = 0;
1475 sk = sock->sk;
1476 vsk = vsock_sk(sk);
1477
1478 switch (optname) {
1479 case SO_VM_SOCKETS_BUFFER_SIZE:
1480 val = transport->get_buffer_size(vsk);
1481 COPY_OUT(val);
1482 break;
1483
1484 case SO_VM_SOCKETS_BUFFER_MAX_SIZE:
1485 val = transport->get_max_buffer_size(vsk);
1486 COPY_OUT(val);
1487 break;
1488
1489 case SO_VM_SOCKETS_BUFFER_MIN_SIZE:
1490 val = transport->get_min_buffer_size(vsk);
1491 COPY_OUT(val);
1492 break;
1493
1494 case SO_VM_SOCKETS_CONNECT_TIMEOUT: {
1495 struct timeval tv;
1496 tv.tv_sec = vsk->connect_timeout / HZ;
1497 tv.tv_usec =
1498 (vsk->connect_timeout -
1499 tv.tv_sec * HZ) * (1000000 / HZ);
1500 COPY_OUT(tv);
1501 break;
1502 }
1503 default:
1504 return -ENOPROTOOPT;
1505 }
1506
1507 err = put_user(len, optlen);
1508 if (err != 0)
1509 return -EFAULT;
1510
1511#undef COPY_OUT
1512
1513 return 0;
1514}
1515
1516static int vsock_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
1517 struct msghdr *msg, size_t len)
1518{
1519 struct sock *sk;
1520 struct vsock_sock *vsk;
1521 ssize_t total_written;
1522 long timeout;
1523 int err;
1524 struct vsock_transport_send_notify_data send_data;
1525
1526 DEFINE_WAIT(wait);
1527
1528 sk = sock->sk;
1529 vsk = vsock_sk(sk);
1530 total_written = 0;
1531 err = 0;
1532
1533 if (msg->msg_flags & MSG_OOB)
1534 return -EOPNOTSUPP;
1535
1536 lock_sock(sk);
1537
1538 /* Callers should not provide a destination with stream sockets. */
1539 if (msg->msg_namelen) {
1540 err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP;
1541 goto out;
1542 }
1543
1544 /* Send data only if both sides are not shutdown in the direction. */
1545 if (sk->sk_shutdown & SEND_SHUTDOWN ||
1546 vsk->peer_shutdown & RCV_SHUTDOWN) {
1547 err = -EPIPE;
1548 goto out;
1549 }
1550
1551 if (sk->sk_state != SS_CONNECTED ||
1552 !vsock_addr_bound(&vsk->local_addr)) {
1553 err = -ENOTCONN;
1554 goto out;
1555 }
1556
1557 if (!vsock_addr_bound(&vsk->remote_addr)) {
1558 err = -EDESTADDRREQ;
1559 goto out;
1560 }
1561
1562 /* Wait for room in the produce queue to enqueue our user's data. */
1563 timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1564
1565 err = transport->notify_send_init(vsk, &send_data);
1566 if (err < 0)
1567 goto out;
1568
1569 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1570
1571 while (total_written < len) {
1572 ssize_t written;
1573
1574 while (vsock_stream_has_space(vsk) == 0 &&
1575 sk->sk_err == 0 &&
1576 !(sk->sk_shutdown & SEND_SHUTDOWN) &&
1577 !(vsk->peer_shutdown & RCV_SHUTDOWN)) {
1578
1579 /* Don't wait for non-blocking sockets. */
1580 if (timeout == 0) {
1581 err = -EAGAIN;
1582 goto out_wait;
1583 }
1584
1585 err = transport->notify_send_pre_block(vsk, &send_data);
1586 if (err < 0)
1587 goto out_wait;
1588
1589 release_sock(sk);
1590 timeout = schedule_timeout(timeout);
1591 lock_sock(sk);
1592 if (signal_pending(current)) {
1593 err = sock_intr_errno(timeout);
1594 goto out_wait;
1595 } else if (timeout == 0) {
1596 err = -EAGAIN;
1597 goto out_wait;
1598 }
1599
1600 prepare_to_wait(sk_sleep(sk), &wait,
1601 TASK_INTERRUPTIBLE);
1602 }
1603
1604 /* These checks occur both as part of and after the loop
1605 * conditional since we need to check before and after
1606 * sleeping.
1607 */
1608 if (sk->sk_err) {
1609 err = -sk->sk_err;
1610 goto out_wait;
1611 } else if ((sk->sk_shutdown & SEND_SHUTDOWN) ||
1612 (vsk->peer_shutdown & RCV_SHUTDOWN)) {
1613 err = -EPIPE;
1614 goto out_wait;
1615 }
1616
1617 err = transport->notify_send_pre_enqueue(vsk, &send_data);
1618 if (err < 0)
1619 goto out_wait;
1620
1621 /* Note that enqueue will only write as many bytes as are free
1622 * in the produce queue, so we don't need to ensure len is
1623 * smaller than the queue size. It is the caller's
1624 * responsibility to check how many bytes we were able to send.
1625 */
1626
1627 written = transport->stream_enqueue(
1628 vsk, msg->msg_iov,
1629 len - total_written);
1630 if (written < 0) {
1631 err = -ENOMEM;
1632 goto out_wait;
1633 }
1634
1635 total_written += written;
1636
1637 err = transport->notify_send_post_enqueue(
1638 vsk, written, &send_data);
1639 if (err < 0)
1640 goto out_wait;
1641
1642 }
1643
1644out_wait:
1645 if (total_written > 0)
1646 err = total_written;
1647 finish_wait(sk_sleep(sk), &wait);
1648out:
1649 release_sock(sk);
1650 return err;
1651}
1652
1653
1654static int
1655vsock_stream_recvmsg(struct kiocb *kiocb,
1656 struct socket *sock,
1657 struct msghdr *msg, size_t len, int flags)
1658{
1659 struct sock *sk;
1660 struct vsock_sock *vsk;
1661 int err;
1662 size_t target;
1663 ssize_t copied;
1664 long timeout;
1665 struct vsock_transport_recv_notify_data recv_data;
1666
1667 DEFINE_WAIT(wait);
1668
1669 sk = sock->sk;
1670 vsk = vsock_sk(sk);
1671 err = 0;
1672
1673 lock_sock(sk);
1674
1675 if (sk->sk_state != SS_CONNECTED) {
1676 /* Recvmsg is supposed to return 0 if a peer performs an
1677 * orderly shutdown. Differentiate between that case and when a
1678 * peer has not connected or a local shutdown occured with the
1679 * SOCK_DONE flag.
1680 */
1681 if (sock_flag(sk, SOCK_DONE))
1682 err = 0;
1683 else
1684 err = -ENOTCONN;
1685
1686 goto out;
1687 }
1688
1689 if (flags & MSG_OOB) {
1690 err = -EOPNOTSUPP;
1691 goto out;
1692 }
1693
1694 /* We don't check peer_shutdown flag here since peer may actually shut
1695 * down, but there can be data in the queue that a local socket can
1696 * receive.
1697 */
1698 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1699 err = 0;
1700 goto out;
1701 }
1702
1703 /* It is valid on Linux to pass in a zero-length receive buffer. This
1704 * is not an error. We may as well bail out now.
1705 */
1706 if (!len) {
1707 err = 0;
1708 goto out;
1709 }
1710
1711 /* We must not copy less than target bytes into the user's buffer
1712 * before returning successfully, so we wait for the consume queue to
1713 * have that much data to consume before dequeueing. Note that this
1714 * makes it impossible to handle cases where target is greater than the
1715 * queue size.
1716 */
1717 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
1718 if (target >= transport->stream_rcvhiwat(vsk)) {
1719 err = -ENOMEM;
1720 goto out;
1721 }
1722 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1723 copied = 0;
1724
1725 err = transport->notify_recv_init(vsk, target, &recv_data);
1726 if (err < 0)
1727 goto out;
1728
1729 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1730
1731 while (1) {
1732 s64 ready = vsock_stream_has_data(vsk);
1733
1734 if (ready < 0) {
1735 /* Invalid queue pair content. XXX This should be
1736 * changed to a connection reset in a later change.
1737 */
1738
1739 err = -ENOMEM;
1740 goto out_wait;
1741 } else if (ready > 0) {
1742 ssize_t read;
1743
1744 err = transport->notify_recv_pre_dequeue(
1745 vsk, target, &recv_data);
1746 if (err < 0)
1747 break;
1748
1749 read = transport->stream_dequeue(
1750 vsk, msg->msg_iov,
1751 len - copied, flags);
1752 if (read < 0) {
1753 err = -ENOMEM;
1754 break;
1755 }
1756
1757 copied += read;
1758
1759 err = transport->notify_recv_post_dequeue(
1760 vsk, target, read,
1761 !(flags & MSG_PEEK), &recv_data);
1762 if (err < 0)
1763 goto out_wait;
1764
1765 if (read >= target || flags & MSG_PEEK)
1766 break;
1767
1768 target -= read;
1769 } else {
1770 if (sk->sk_err != 0 || (sk->sk_shutdown & RCV_SHUTDOWN)
1771 || (vsk->peer_shutdown & SEND_SHUTDOWN)) {
1772 break;
1773 }
1774 /* Don't wait for non-blocking sockets. */
1775 if (timeout == 0) {
1776 err = -EAGAIN;
1777 break;
1778 }
1779
1780 err = transport->notify_recv_pre_block(
1781 vsk, target, &recv_data);
1782 if (err < 0)
1783 break;
1784
1785 release_sock(sk);
1786 timeout = schedule_timeout(timeout);
1787 lock_sock(sk);
1788
1789 if (signal_pending(current)) {
1790 err = sock_intr_errno(timeout);
1791 break;
1792 } else if (timeout == 0) {
1793 err = -EAGAIN;
1794 break;
1795 }
1796
1797 prepare_to_wait(sk_sleep(sk), &wait,
1798 TASK_INTERRUPTIBLE);
1799 }
1800 }
1801
1802 if (sk->sk_err)
1803 err = -sk->sk_err;
1804 else if (sk->sk_shutdown & RCV_SHUTDOWN)
1805 err = 0;
1806
1807 if (copied > 0) {
1808 /* We only do these additional bookkeeping/notification steps
1809 * if we actually copied something out of the queue pair
1810 * instead of just peeking ahead.
1811 */
1812
1813 if (!(flags & MSG_PEEK)) {
1814 /* If the other side has shutdown for sending and there
1815 * is nothing more to read, then modify the socket
1816 * state.
1817 */
1818 if (vsk->peer_shutdown & SEND_SHUTDOWN) {
1819 if (vsock_stream_has_data(vsk) <= 0) {
1820 sk->sk_state = SS_UNCONNECTED;
1821 sock_set_flag(sk, SOCK_DONE);
1822 sk->sk_state_change(sk);
1823 }
1824 }
1825 }
1826 err = copied;
1827 }
1828
1829out_wait:
1830 finish_wait(sk_sleep(sk), &wait);
1831out:
1832 release_sock(sk);
1833 return err;
1834}
1835
1836static const struct proto_ops vsock_stream_ops = {
1837 .family = PF_VSOCK,
1838 .owner = THIS_MODULE,
1839 .release = vsock_release,
1840 .bind = vsock_bind,
1841 .connect = vsock_stream_connect,
1842 .socketpair = sock_no_socketpair,
1843 .accept = vsock_accept,
1844 .getname = vsock_getname,
1845 .poll = vsock_poll,
1846 .ioctl = sock_no_ioctl,
1847 .listen = vsock_listen,
1848 .shutdown = vsock_shutdown,
1849 .setsockopt = vsock_stream_setsockopt,
1850 .getsockopt = vsock_stream_getsockopt,
1851 .sendmsg = vsock_stream_sendmsg,
1852 .recvmsg = vsock_stream_recvmsg,
1853 .mmap = sock_no_mmap,
1854 .sendpage = sock_no_sendpage,
1855};
1856
1857static int vsock_create(struct net *net, struct socket *sock,
1858 int protocol, int kern)
1859{
1860 if (!sock)
1861 return -EINVAL;
1862
1863 if (protocol && protocol != PF_VSOCK)
1864 return -EPROTONOSUPPORT;
1865
1866 switch (sock->type) {
1867 case SOCK_DGRAM:
1868 sock->ops = &vsock_dgram_ops;
1869 break;
1870 case SOCK_STREAM:
1871 sock->ops = &vsock_stream_ops;
1872 break;
1873 default:
1874 return -ESOCKTNOSUPPORT;
1875 }
1876
1877 sock->state = SS_UNCONNECTED;
1878
1879 return __vsock_create(net, sock, NULL, GFP_KERNEL, 0) ? 0 : -ENOMEM;
1880}
1881
1882static const struct net_proto_family vsock_family_ops = {
1883 .family = AF_VSOCK,
1884 .create = vsock_create,
1885 .owner = THIS_MODULE,
1886};
1887
1888static long vsock_dev_do_ioctl(struct file *filp,
1889 unsigned int cmd, void __user *ptr)
1890{
1891 u32 __user *p = ptr;
1892 int retval = 0;
1893
1894 switch (cmd) {
1895 case IOCTL_VM_SOCKETS_GET_LOCAL_CID:
1896 if (put_user(transport->get_local_cid(), p) != 0)
1897 retval = -EFAULT;
1898 break;
1899
1900 default:
1901 pr_err("Unknown ioctl %d\n", cmd);
1902 retval = -EINVAL;
1903 }
1904
1905 return retval;
1906}
1907
1908static long vsock_dev_ioctl(struct file *filp,
1909 unsigned int cmd, unsigned long arg)
1910{
1911 return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg);
1912}
1913
1914#ifdef CONFIG_COMPAT
1915static long vsock_dev_compat_ioctl(struct file *filp,
1916 unsigned int cmd, unsigned long arg)
1917{
1918 return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg));
1919}
1920#endif
1921
1922static const struct file_operations vsock_device_ops = {
1923 .owner = THIS_MODULE,
1924 .unlocked_ioctl = vsock_dev_ioctl,
1925#ifdef CONFIG_COMPAT
1926 .compat_ioctl = vsock_dev_compat_ioctl,
1927#endif
1928 .open = nonseekable_open,
1929};
1930
1931static struct miscdevice vsock_device = {
1932 .name = "vsock",
1933 .minor = MISC_DYNAMIC_MINOR,
1934 .fops = &vsock_device_ops,
1935};
1936
1937static int __vsock_core_init(void)
1938{
1939 int err;
1940
1941 vsock_init_tables();
1942
1943 err = misc_register(&vsock_device);
1944 if (err) {
1945 pr_err("Failed to register misc device\n");
1946 return -ENOENT;
1947 }
1948
1949 err = proto_register(&vsock_proto, 1); /* we want our slab */
1950 if (err) {
1951 pr_err("Cannot register vsock protocol\n");
1952 goto err_misc_deregister;
1953 }
1954
1955 err = sock_register(&vsock_family_ops);
1956 if (err) {
1957 pr_err("could not register af_vsock (%d) address family: %d\n",
1958 AF_VSOCK, err);
1959 goto err_unregister_proto;
1960 }
1961
1962 return 0;
1963
1964err_unregister_proto:
1965 proto_unregister(&vsock_proto);
1966err_misc_deregister:
1967 misc_deregister(&vsock_device);
1968 return err;
1969}
1970
1971int vsock_core_init(const struct vsock_transport *t)
1972{
1973 int retval = mutex_lock_interruptible(&vsock_register_mutex);
1974 if (retval)
1975 return retval;
1976
1977 if (transport) {
1978 retval = -EBUSY;
1979 goto out;
1980 }
1981
1982 transport = t;
1983 retval = __vsock_core_init();
1984 if (retval)
1985 transport = NULL;
1986
1987out:
1988 mutex_unlock(&vsock_register_mutex);
1989 return retval;
1990}
1991EXPORT_SYMBOL_GPL(vsock_core_init);
1992
1993void vsock_core_exit(void)
1994{
1995 mutex_lock(&vsock_register_mutex);
1996
1997 misc_deregister(&vsock_device);
1998 sock_unregister(AF_VSOCK);
1999 proto_unregister(&vsock_proto);
2000
2001 /* We do not want the assignment below re-ordered. */
2002 mb();
2003 transport = NULL;
2004
2005 mutex_unlock(&vsock_register_mutex);
2006}
2007EXPORT_SYMBOL_GPL(vsock_core_exit);
2008
2009MODULE_AUTHOR("VMware, Inc.");
2010MODULE_DESCRIPTION("VMware Virtual Socket Family");
2011MODULE_VERSION("1.0.0.0-k");
2012MODULE_LICENSE("GPL v2");
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-21 08:54:55 -0500