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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 | ||
80 | #define EXPORT_SYMTAB | |
81 | #include <linux/bitops.h> | |
82 | #include <linux/cred.h> | |
83 | #include <linux/init.h> | |
84 | #include <linux/io.h> | |
85 | #include <linux/kernel.h> | |
86 | #include <linux/kmod.h> | |
87 | #include <linux/list.h> | |
88 | #include <linux/miscdevice.h> | |
89 | #include <linux/module.h> | |
90 | #include <linux/mutex.h> | |
91 | #include <linux/net.h> | |
92 | #include <linux/poll.h> | |
93 | #include <linux/skbuff.h> | |
94 | #include <linux/smp.h> | |
95 | #include <linux/socket.h> | |
96 | #include <linux/stddef.h> | |
97 | #include <linux/unistd.h> | |
98 | #include <linux/wait.h> | |
99 | #include <linux/workqueue.h> | |
100 | #include <net/sock.h> | |
101 | ||
102 | #include "af_vsock.h" | |
103 | #include "vsock_version.h" | |
104 | ||
105 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); | |
106 | static void vsock_sk_destruct(struct sock *sk); | |
107 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); | |
108 | ||
109 | /* Protocol family. */ | |
110 | static struct proto vsock_proto = { | |
111 | .name = "AF_VSOCK", | |
112 | .owner = THIS_MODULE, | |
113 | .obj_size = sizeof(struct vsock_sock), | |
114 | }; | |
115 | ||
116 | /* The default peer timeout indicates how long we will wait for a peer response | |
117 | * to a control message. | |
118 | */ | |
119 | #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) | |
120 | ||
121 | #define SS_LISTEN 255 | |
122 | ||
123 | static const struct vsock_transport *transport; | |
124 | static DEFINE_MUTEX(vsock_register_mutex); | |
125 | ||
126 | /**** EXPORTS ****/ | |
127 | ||
128 | /* Get the ID of the local context. This is transport dependent. */ | |
129 | ||
130 | int vm_sockets_get_local_cid(void) | |
131 | { | |
132 | return transport->get_local_cid(); | |
133 | } | |
134 | EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid); | |
135 | ||
136 | /**** UTILS ****/ | |
137 | ||
138 | /* Each bound VSocket is stored in the bind hash table and each connected | |
139 | * VSocket is stored in the connected hash table. | |
140 | * | |
141 | * Unbound sockets are all put on the same list attached to the end of the hash | |
142 | * table (vsock_unbound_sockets). Bound sockets are added to the hash table in | |
143 | * the bucket that their local address hashes to (vsock_bound_sockets(addr) | |
144 | * represents the list that addr hashes to). | |
145 | * | |
146 | * Specifically, we initialize the vsock_bind_table array to a size of | |
147 | * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through | |
148 | * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and | |
149 | * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function | |
150 | * mods with VSOCK_HASH_SIZE - 1 to ensure this. | |
151 | */ | |
152 | #define VSOCK_HASH_SIZE 251 | |
153 | #define MAX_PORT_RETRIES 24 | |
154 | ||
155 | #define VSOCK_HASH(addr) ((addr)->svm_port % (VSOCK_HASH_SIZE - 1)) | |
156 | #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) | |
157 | #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) | |
158 | ||
159 | /* XXX This can probably be implemented in a better way. */ | |
160 | #define VSOCK_CONN_HASH(src, dst) \ | |
161 | (((src)->svm_cid ^ (dst)->svm_port) % (VSOCK_HASH_SIZE - 1)) | |
162 | #define vsock_connected_sockets(src, dst) \ | |
163 | (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) | |
164 | #define vsock_connected_sockets_vsk(vsk) \ | |
165 | vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) | |
166 | ||
167 | static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; | |
168 | static struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; | |
169 | static DEFINE_SPINLOCK(vsock_table_lock); | |
170 | ||
171 | static __init void vsock_init_tables(void) | |
172 | { | |
173 | int i; | |
174 | ||
175 | for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) | |
176 | INIT_LIST_HEAD(&vsock_bind_table[i]); | |
177 | ||
178 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) | |
179 | INIT_LIST_HEAD(&vsock_connected_table[i]); | |
180 | } | |
181 | ||
182 | static void __vsock_insert_bound(struct list_head *list, | |
183 | struct vsock_sock *vsk) | |
184 | { | |
185 | sock_hold(&vsk->sk); | |
186 | list_add(&vsk->bound_table, list); | |
187 | } | |
188 | ||
189 | static void __vsock_insert_connected(struct list_head *list, | |
190 | struct vsock_sock *vsk) | |
191 | { | |
192 | sock_hold(&vsk->sk); | |
193 | list_add(&vsk->connected_table, list); | |
194 | } | |
195 | ||
196 | static void __vsock_remove_bound(struct vsock_sock *vsk) | |
197 | { | |
198 | list_del_init(&vsk->bound_table); | |
199 | sock_put(&vsk->sk); | |
200 | } | |
201 | ||
202 | static void __vsock_remove_connected(struct vsock_sock *vsk) | |
203 | { | |
204 | list_del_init(&vsk->connected_table); | |
205 | sock_put(&vsk->sk); | |
206 | } | |
207 | ||
208 | static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) | |
209 | { | |
210 | struct vsock_sock *vsk; | |
211 | ||
212 | list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) | |
213 | if (vsock_addr_equals_addr_any(addr, &vsk->local_addr)) | |
214 | return sk_vsock(vsk); | |
215 | ||
216 | return NULL; | |
217 | } | |
218 | ||
219 | static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, | |
220 | struct sockaddr_vm *dst) | |
221 | { | |
222 | struct vsock_sock *vsk; | |
223 | ||
224 | list_for_each_entry(vsk, vsock_connected_sockets(src, dst), | |
225 | connected_table) { | |
226 | if (vsock_addr_equals_addr(src, &vsk->remote_addr) | |
227 | && vsock_addr_equals_addr(dst, &vsk->local_addr)) { | |
228 | return sk_vsock(vsk); | |
229 | } | |
230 | } | |
231 | ||
232 | return NULL; | |
233 | } | |
234 | ||
235 | static bool __vsock_in_bound_table(struct vsock_sock *vsk) | |
236 | { | |
237 | return !list_empty(&vsk->bound_table); | |
238 | } | |
239 | ||
240 | static bool __vsock_in_connected_table(struct vsock_sock *vsk) | |
241 | { | |
242 | return !list_empty(&vsk->connected_table); | |
243 | } | |
244 | ||
245 | static void vsock_insert_unbound(struct vsock_sock *vsk) | |
246 | { | |
247 | spin_lock_bh(&vsock_table_lock); | |
248 | __vsock_insert_bound(vsock_unbound_sockets, vsk); | |
249 | spin_unlock_bh(&vsock_table_lock); | |
250 | } | |
251 | ||
252 | void vsock_insert_connected(struct vsock_sock *vsk) | |
253 | { | |
254 | struct list_head *list = vsock_connected_sockets( | |
255 | &vsk->remote_addr, &vsk->local_addr); | |
256 | ||
257 | spin_lock_bh(&vsock_table_lock); | |
258 | __vsock_insert_connected(list, vsk); | |
259 | spin_unlock_bh(&vsock_table_lock); | |
260 | } | |
261 | EXPORT_SYMBOL_GPL(vsock_insert_connected); | |
262 | ||
263 | void vsock_remove_bound(struct vsock_sock *vsk) | |
264 | { | |
265 | spin_lock_bh(&vsock_table_lock); | |
266 | __vsock_remove_bound(vsk); | |
267 | spin_unlock_bh(&vsock_table_lock); | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(vsock_remove_bound); | |
270 | ||
271 | void vsock_remove_connected(struct vsock_sock *vsk) | |
272 | { | |
273 | spin_lock_bh(&vsock_table_lock); | |
274 | __vsock_remove_connected(vsk); | |
275 | spin_unlock_bh(&vsock_table_lock); | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(vsock_remove_connected); | |
278 | ||
279 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) | |
280 | { | |
281 | struct sock *sk; | |
282 | ||
283 | spin_lock_bh(&vsock_table_lock); | |
284 | sk = __vsock_find_bound_socket(addr); | |
285 | if (sk) | |
286 | sock_hold(sk); | |
287 | ||
288 | spin_unlock_bh(&vsock_table_lock); | |
289 | ||
290 | return sk; | |
291 | } | |
292 | EXPORT_SYMBOL_GPL(vsock_find_bound_socket); | |
293 | ||
294 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, | |
295 | struct sockaddr_vm *dst) | |
296 | { | |
297 | struct sock *sk; | |
298 | ||
299 | spin_lock_bh(&vsock_table_lock); | |
300 | sk = __vsock_find_connected_socket(src, dst); | |
301 | if (sk) | |
302 | sock_hold(sk); | |
303 | ||
304 | spin_unlock_bh(&vsock_table_lock); | |
305 | ||
306 | return sk; | |
307 | } | |
308 | EXPORT_SYMBOL_GPL(vsock_find_connected_socket); | |
309 | ||
310 | static bool vsock_in_bound_table(struct vsock_sock *vsk) | |
311 | { | |
312 | bool ret; | |
313 | ||
314 | spin_lock_bh(&vsock_table_lock); | |
315 | ret = __vsock_in_bound_table(vsk); | |
316 | spin_unlock_bh(&vsock_table_lock); | |
317 | ||
318 | return ret; | |
319 | } | |
320 | ||
321 | static bool vsock_in_connected_table(struct vsock_sock *vsk) | |
322 | { | |
323 | bool ret; | |
324 | ||
325 | spin_lock_bh(&vsock_table_lock); | |
326 | ret = __vsock_in_connected_table(vsk); | |
327 | spin_unlock_bh(&vsock_table_lock); | |
328 | ||
329 | return ret; | |
330 | } | |
331 | ||
332 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) | |
333 | { | |
334 | int i; | |
335 | ||
336 | spin_lock_bh(&vsock_table_lock); | |
337 | ||
338 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { | |
339 | struct vsock_sock *vsk; | |
340 | list_for_each_entry(vsk, &vsock_connected_table[i], | |
341 | connected_table); | |
342 | fn(sk_vsock(vsk)); | |
343 | } | |
344 | ||
345 | spin_unlock_bh(&vsock_table_lock); | |
346 | } | |
347 | EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); | |
348 | ||
349 | void vsock_add_pending(struct sock *listener, struct sock *pending) | |
350 | { | |
351 | struct vsock_sock *vlistener; | |
352 | struct vsock_sock *vpending; | |
353 | ||
354 | vlistener = vsock_sk(listener); | |
355 | vpending = vsock_sk(pending); | |
356 | ||
357 | sock_hold(pending); | |
358 | sock_hold(listener); | |
359 | list_add_tail(&vpending->pending_links, &vlistener->pending_links); | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(vsock_add_pending); | |
362 | ||
363 | void vsock_remove_pending(struct sock *listener, struct sock *pending) | |
364 | { | |
365 | struct vsock_sock *vpending = vsock_sk(pending); | |
366 | ||
367 | list_del_init(&vpending->pending_links); | |
368 | sock_put(listener); | |
369 | sock_put(pending); | |
370 | } | |
371 | EXPORT_SYMBOL_GPL(vsock_remove_pending); | |
372 | ||
373 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected) | |
374 | { | |
375 | struct vsock_sock *vlistener; | |
376 | struct vsock_sock *vconnected; | |
377 | ||
378 | vlistener = vsock_sk(listener); | |
379 | vconnected = vsock_sk(connected); | |
380 | ||
381 | sock_hold(connected); | |
382 | sock_hold(listener); | |
383 | list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); | |
384 | } | |
385 | EXPORT_SYMBOL_GPL(vsock_enqueue_accept); | |
386 | ||
387 | static struct sock *vsock_dequeue_accept(struct sock *listener) | |
388 | { | |
389 | struct vsock_sock *vlistener; | |
390 | struct vsock_sock *vconnected; | |
391 | ||
392 | vlistener = vsock_sk(listener); | |
393 | ||
394 | if (list_empty(&vlistener->accept_queue)) | |
395 | return NULL; | |
396 | ||
397 | vconnected = list_entry(vlistener->accept_queue.next, | |
398 | struct vsock_sock, accept_queue); | |
399 | ||
400 | list_del_init(&vconnected->accept_queue); | |
401 | sock_put(listener); | |
402 | /* The caller will need a reference on the connected socket so we let | |
403 | * it call sock_put(). | |
404 | */ | |
405 | ||
406 | return sk_vsock(vconnected); | |
407 | } | |
408 | ||
409 | static bool vsock_is_accept_queue_empty(struct sock *sk) | |
410 | { | |
411 | struct vsock_sock *vsk = vsock_sk(sk); | |
412 | return list_empty(&vsk->accept_queue); | |
413 | } | |
414 | ||
415 | static bool vsock_is_pending(struct sock *sk) | |
416 | { | |
417 | struct vsock_sock *vsk = vsock_sk(sk); | |
418 | return !list_empty(&vsk->pending_links); | |
419 | } | |
420 | ||
421 | static int vsock_send_shutdown(struct sock *sk, int mode) | |
422 | { | |
423 | return transport->shutdown(vsock_sk(sk), mode); | |
424 | } | |
425 | ||
426 | void vsock_pending_work(struct work_struct *work) | |
427 | { | |
428 | struct sock *sk; | |
429 | struct sock *listener; | |
430 | struct vsock_sock *vsk; | |
431 | bool cleanup; | |
432 | ||
433 | vsk = container_of(work, struct vsock_sock, dwork.work); | |
434 | sk = sk_vsock(vsk); | |
435 | listener = vsk->listener; | |
436 | cleanup = true; | |
437 | ||
438 | lock_sock(listener); | |
439 | lock_sock(sk); | |
440 | ||
441 | if (vsock_is_pending(sk)) { | |
442 | vsock_remove_pending(listener, sk); | |
443 | } else if (!vsk->rejected) { | |
444 | /* We are not on the pending list and accept() did not reject | |
445 | * us, so we must have been accepted by our user process. We | |
446 | * just need to drop our references to the sockets and be on | |
447 | * our way. | |
448 | */ | |
449 | cleanup = false; | |
450 | goto out; | |
451 | } | |
452 | ||
453 | listener->sk_ack_backlog--; | |
454 | ||
455 | /* We need to remove ourself from the global connected sockets list so | |
456 | * incoming packets can't find this socket, and to reduce the reference | |
457 | * count. | |
458 | */ | |
459 | if (vsock_in_connected_table(vsk)) | |
460 | vsock_remove_connected(vsk); | |
461 | ||
462 | sk->sk_state = SS_FREE; | |
463 | ||
464 | out: | |
465 | release_sock(sk); | |
466 | release_sock(listener); | |
467 | if (cleanup) | |
468 | sock_put(sk); | |
469 | ||
470 | sock_put(sk); | |
471 | sock_put(listener); | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(vsock_pending_work); | |
474 | ||
475 | /**** SOCKET OPERATIONS ****/ | |
476 | ||
477 | static int __vsock_bind_stream(struct vsock_sock *vsk, | |
478 | struct sockaddr_vm *addr) | |
479 | { | |
480 | static u32 port = LAST_RESERVED_PORT + 1; | |
481 | struct sockaddr_vm new_addr; | |
482 | ||
483 | vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); | |
484 | ||
485 | if (addr->svm_port == VMADDR_PORT_ANY) { | |
486 | bool found = false; | |
487 | unsigned int i; | |
488 | ||
489 | for (i = 0; i < MAX_PORT_RETRIES; i++) { | |
490 | if (port <= LAST_RESERVED_PORT) | |
491 | port = LAST_RESERVED_PORT + 1; | |
492 | ||
493 | new_addr.svm_port = port++; | |
494 | ||
495 | if (!__vsock_find_bound_socket(&new_addr)) { | |
496 | found = true; | |
497 | break; | |
498 | } | |
499 | } | |
500 | ||
501 | if (!found) | |
502 | return -EADDRNOTAVAIL; | |
503 | } else { | |
504 | /* If port is in reserved range, ensure caller | |
505 | * has necessary privileges. | |
506 | */ | |
507 | if (addr->svm_port <= LAST_RESERVED_PORT && | |
508 | !capable(CAP_NET_BIND_SERVICE)) { | |
509 | return -EACCES; | |
510 | } | |
511 | ||
512 | if (__vsock_find_bound_socket(&new_addr)) | |
513 | return -EADDRINUSE; | |
514 | } | |
515 | ||
516 | vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); | |
517 | ||
518 | /* Remove stream sockets from the unbound list and add them to the hash | |
519 | * table for easy lookup by its address. The unbound list is simply an | |
520 | * extra entry at the end of the hash table, a trick used by AF_UNIX. | |
521 | */ | |
522 | __vsock_remove_bound(vsk); | |
523 | __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | static int __vsock_bind_dgram(struct vsock_sock *vsk, | |
529 | struct sockaddr_vm *addr) | |
530 | { | |
531 | return transport->dgram_bind(vsk, addr); | |
532 | } | |
533 | ||
534 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) | |
535 | { | |
536 | struct vsock_sock *vsk = vsock_sk(sk); | |
537 | u32 cid; | |
538 | int retval; | |
539 | ||
540 | /* First ensure this socket isn't already bound. */ | |
541 | if (vsock_addr_bound(&vsk->local_addr)) | |
542 | return -EINVAL; | |
543 | ||
544 | /* Now bind to the provided address or select appropriate values if | |
545 | * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that | |
546 | * like AF_INET prevents binding to a non-local IP address (in most | |
547 | * cases), we only allow binding to the local CID. | |
548 | */ | |
549 | cid = transport->get_local_cid(); | |
550 | if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) | |
551 | return -EADDRNOTAVAIL; | |
552 | ||
553 | switch (sk->sk_socket->type) { | |
554 | case SOCK_STREAM: | |
555 | spin_lock_bh(&vsock_table_lock); | |
556 | retval = __vsock_bind_stream(vsk, addr); | |
557 | spin_unlock_bh(&vsock_table_lock); | |
558 | break; | |
559 | ||
560 | case SOCK_DGRAM: | |
561 | retval = __vsock_bind_dgram(vsk, addr); | |
562 | break; | |
563 | ||
564 | default: | |
565 | retval = -EINVAL; | |
566 | break; | |
567 | } | |
568 | ||
569 | return retval; | |
570 | } | |
571 | ||
572 | struct sock *__vsock_create(struct net *net, | |
573 | struct socket *sock, | |
574 | struct sock *parent, | |
575 | gfp_t priority, | |
576 | unsigned short type) | |
577 | { | |
578 | struct sock *sk; | |
579 | struct vsock_sock *psk; | |
580 | struct vsock_sock *vsk; | |
581 | ||
582 | sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto); | |
583 | if (!sk) | |
584 | return NULL; | |
585 | ||
586 | sock_init_data(sock, sk); | |
587 | ||
588 | /* sk->sk_type is normally set in sock_init_data, but only if sock is | |
589 | * non-NULL. We make sure that our sockets always have a type by | |
590 | * setting it here if needed. | |
591 | */ | |
592 | if (!sock) | |
593 | sk->sk_type = type; | |
594 | ||
595 | vsk = vsock_sk(sk); | |
596 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
597 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
598 | ||
599 | sk->sk_destruct = vsock_sk_destruct; | |
600 | sk->sk_backlog_rcv = vsock_queue_rcv_skb; | |
601 | sk->sk_state = 0; | |
602 | sock_reset_flag(sk, SOCK_DONE); | |
603 | ||
604 | INIT_LIST_HEAD(&vsk->bound_table); | |
605 | INIT_LIST_HEAD(&vsk->connected_table); | |
606 | vsk->listener = NULL; | |
607 | INIT_LIST_HEAD(&vsk->pending_links); | |
608 | INIT_LIST_HEAD(&vsk->accept_queue); | |
609 | vsk->rejected = false; | |
610 | vsk->sent_request = false; | |
611 | vsk->ignore_connecting_rst = false; | |
612 | vsk->peer_shutdown = 0; | |
613 | ||
614 | psk = parent ? vsock_sk(parent) : NULL; | |
615 | if (parent) { | |
616 | vsk->trusted = psk->trusted; | |
617 | vsk->owner = get_cred(psk->owner); | |
618 | vsk->connect_timeout = psk->connect_timeout; | |
619 | } else { | |
620 | vsk->trusted = capable(CAP_NET_ADMIN); | |
621 | vsk->owner = get_current_cred(); | |
622 | vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
623 | } | |
624 | ||
625 | if (transport->init(vsk, psk) < 0) { | |
626 | sk_free(sk); | |
627 | return NULL; | |
628 | } | |
629 | ||
630 | if (sock) | |
631 | vsock_insert_unbound(vsk); | |
632 | ||
633 | return sk; | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(__vsock_create); | |
636 | ||
637 | static void __vsock_release(struct sock *sk) | |
638 | { | |
639 | if (sk) { | |
640 | struct sk_buff *skb; | |
641 | struct sock *pending; | |
642 | struct vsock_sock *vsk; | |
643 | ||
644 | vsk = vsock_sk(sk); | |
645 | pending = NULL; /* Compiler warning. */ | |
646 | ||
647 | if (vsock_in_bound_table(vsk)) | |
648 | vsock_remove_bound(vsk); | |
649 | ||
650 | if (vsock_in_connected_table(vsk)) | |
651 | vsock_remove_connected(vsk); | |
652 | ||
653 | transport->release(vsk); | |
654 | ||
655 | lock_sock(sk); | |
656 | sock_orphan(sk); | |
657 | sk->sk_shutdown = SHUTDOWN_MASK; | |
658 | ||
659 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) | |
660 | kfree_skb(skb); | |
661 | ||
662 | /* Clean up any sockets that never were accepted. */ | |
663 | while ((pending = vsock_dequeue_accept(sk)) != NULL) { | |
664 | __vsock_release(pending); | |
665 | sock_put(pending); | |
666 | } | |
667 | ||
668 | release_sock(sk); | |
669 | sock_put(sk); | |
670 | } | |
671 | } | |
672 | ||
673 | static void vsock_sk_destruct(struct sock *sk) | |
674 | { | |
675 | struct vsock_sock *vsk = vsock_sk(sk); | |
676 | ||
677 | transport->destruct(vsk); | |
678 | ||
679 | /* When clearing these addresses, there's no need to set the family and | |
680 | * possibly register the address family with the kernel. | |
681 | */ | |
682 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
683 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
684 | ||
685 | put_cred(vsk->owner); | |
686 | } | |
687 | ||
688 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
689 | { | |
690 | int err; | |
691 | ||
692 | err = sock_queue_rcv_skb(sk, skb); | |
693 | if (err) | |
694 | kfree_skb(skb); | |
695 | ||
696 | return err; | |
697 | } | |
698 | ||
699 | s64 vsock_stream_has_data(struct vsock_sock *vsk) | |
700 | { | |
701 | return transport->stream_has_data(vsk); | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(vsock_stream_has_data); | |
704 | ||
705 | s64 vsock_stream_has_space(struct vsock_sock *vsk) | |
706 | { | |
707 | return transport->stream_has_space(vsk); | |
708 | } | |
709 | EXPORT_SYMBOL_GPL(vsock_stream_has_space); | |
710 | ||
711 | static int vsock_release(struct socket *sock) | |
712 | { | |
713 | __vsock_release(sock->sk); | |
714 | sock->sk = NULL; | |
715 | sock->state = SS_FREE; | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
720 | static int | |
721 | vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
722 | { | |
723 | int err; | |
724 | struct sock *sk; | |
725 | struct sockaddr_vm *vm_addr; | |
726 | ||
727 | sk = sock->sk; | |
728 | ||
729 | if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) | |
730 | return -EINVAL; | |
731 | ||
732 | lock_sock(sk); | |
733 | err = __vsock_bind(sk, vm_addr); | |
734 | release_sock(sk); | |
735 | ||
736 | return err; | |
737 | } | |
738 | ||
739 | static int vsock_getname(struct socket *sock, | |
740 | struct sockaddr *addr, int *addr_len, int peer) | |
741 | { | |
742 | int err; | |
743 | struct sock *sk; | |
744 | struct vsock_sock *vsk; | |
745 | struct sockaddr_vm *vm_addr; | |
746 | ||
747 | sk = sock->sk; | |
748 | vsk = vsock_sk(sk); | |
749 | err = 0; | |
750 | ||
751 | lock_sock(sk); | |
752 | ||
753 | if (peer) { | |
754 | if (sock->state != SS_CONNECTED) { | |
755 | err = -ENOTCONN; | |
756 | goto out; | |
757 | } | |
758 | vm_addr = &vsk->remote_addr; | |
759 | } else { | |
760 | vm_addr = &vsk->local_addr; | |
761 | } | |
762 | ||
763 | if (!vm_addr) { | |
764 | err = -EINVAL; | |
765 | goto out; | |
766 | } | |
767 | ||
768 | /* sys_getsockname() and sys_getpeername() pass us a | |
769 | * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately | |
770 | * that macro is defined in socket.c instead of .h, so we hardcode its | |
771 | * value here. | |
772 | */ | |
773 | BUILD_BUG_ON(sizeof(*vm_addr) > 128); | |
774 | memcpy(addr, vm_addr, sizeof(*vm_addr)); | |
775 | *addr_len = sizeof(*vm_addr); | |
776 | ||
777 | out: | |
778 | release_sock(sk); | |
779 | return err; | |
780 | } | |
781 | ||
782 | static int vsock_shutdown(struct socket *sock, int mode) | |
783 | { | |
784 | int err; | |
785 | struct sock *sk; | |
786 | ||
787 | /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses | |
788 | * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode | |
789 | * here like the other address families do. Note also that the | |
790 | * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), | |
791 | * which is what we want. | |
792 | */ | |
793 | mode++; | |
794 | ||
795 | if ((mode & ~SHUTDOWN_MASK) || !mode) | |
796 | return -EINVAL; | |
797 | ||
798 | /* If this is a STREAM socket and it is not connected then bail out | |
799 | * immediately. If it is a DGRAM socket then we must first kick the | |
800 | * socket so that it wakes up from any sleeping calls, for example | |
801 | * recv(), and then afterwards return the error. | |
802 | */ | |
803 | ||
804 | sk = sock->sk; | |
805 | if (sock->state == SS_UNCONNECTED) { | |
806 | err = -ENOTCONN; | |
807 | if (sk->sk_type == SOCK_STREAM) | |
808 | return err; | |
809 | } else { | |
810 | sock->state = SS_DISCONNECTING; | |
811 | err = 0; | |
812 | } | |
813 | ||
814 | /* Receive and send shutdowns are treated alike. */ | |
815 | mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); | |
816 | if (mode) { | |
817 | lock_sock(sk); | |
818 | sk->sk_shutdown |= mode; | |
819 | sk->sk_state_change(sk); | |
820 | release_sock(sk); | |
821 | ||
822 | if (sk->sk_type == SOCK_STREAM) { | |
823 | sock_reset_flag(sk, SOCK_DONE); | |
824 | vsock_send_shutdown(sk, mode); | |
825 | } | |
826 | } | |
827 | ||
828 | return err; | |
829 | } | |
830 | ||
831 | static unsigned int vsock_poll(struct file *file, struct socket *sock, | |
832 | poll_table *wait) | |
833 | { | |
834 | struct sock *sk; | |
835 | unsigned int mask; | |
836 | struct vsock_sock *vsk; | |
837 | ||
838 | sk = sock->sk; | |
839 | vsk = vsock_sk(sk); | |
840 | ||
841 | poll_wait(file, sk_sleep(sk), wait); | |
842 | mask = 0; | |
843 | ||
844 | if (sk->sk_err) | |
845 | /* Signify that there has been an error on this socket. */ | |
846 | mask |= POLLERR; | |
847 | ||
848 | /* INET sockets treat local write shutdown and peer write shutdown as a | |
849 | * case of POLLHUP set. | |
850 | */ | |
851 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || | |
852 | ((sk->sk_shutdown & SEND_SHUTDOWN) && | |
853 | (vsk->peer_shutdown & SEND_SHUTDOWN))) { | |
854 | mask |= POLLHUP; | |
855 | } | |
856 | ||
857 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
858 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
859 | mask |= POLLRDHUP; | |
860 | } | |
861 | ||
862 | if (sock->type == SOCK_DGRAM) { | |
863 | /* For datagram sockets we can read if there is something in | |
864 | * the queue and write as long as the socket isn't shutdown for | |
865 | * sending. | |
866 | */ | |
867 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
868 | (sk->sk_shutdown & RCV_SHUTDOWN)) { | |
869 | mask |= POLLIN | POLLRDNORM; | |
870 | } | |
871 | ||
872 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
873 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
874 | ||
875 | } else if (sock->type == SOCK_STREAM) { | |
876 | lock_sock(sk); | |
877 | ||
878 | /* Listening sockets that have connections in their accept | |
879 | * queue can be read. | |
880 | */ | |
881 | if (sk->sk_state == SS_LISTEN | |
882 | && !vsock_is_accept_queue_empty(sk)) | |
883 | mask |= POLLIN | POLLRDNORM; | |
884 | ||
885 | /* If there is something in the queue then we can read. */ | |
886 | if (transport->stream_is_active(vsk) && | |
887 | !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
888 | bool data_ready_now = false; | |
889 | int ret = transport->notify_poll_in( | |
890 | vsk, 1, &data_ready_now); | |
891 | if (ret < 0) { | |
892 | mask |= POLLERR; | |
893 | } else { | |
894 | if (data_ready_now) | |
895 | mask |= POLLIN | POLLRDNORM; | |
896 | ||
897 | } | |
898 | } | |
899 | ||
900 | /* Sockets whose connections have been closed, reset, or | |
901 | * terminated should also be considered read, and we check the | |
902 | * shutdown flag for that. | |
903 | */ | |
904 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
905 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
906 | mask |= POLLIN | POLLRDNORM; | |
907 | } | |
908 | ||
909 | /* Connected sockets that can produce data can be written. */ | |
910 | if (sk->sk_state == SS_CONNECTED) { | |
911 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
912 | bool space_avail_now = false; | |
913 | int ret = transport->notify_poll_out( | |
914 | vsk, 1, &space_avail_now); | |
915 | if (ret < 0) { | |
916 | mask |= POLLERR; | |
917 | } else { | |
918 | if (space_avail_now) | |
919 | /* Remove POLLWRBAND since INET | |
920 | * sockets are not setting it. | |
921 | */ | |
922 | mask |= POLLOUT | POLLWRNORM; | |
923 | ||
924 | } | |
925 | } | |
926 | } | |
927 | ||
928 | /* Simulate INET socket poll behaviors, which sets | |
929 | * POLLOUT|POLLWRNORM when peer is closed and nothing to read, | |
930 | * but local send is not shutdown. | |
931 | */ | |
932 | if (sk->sk_state == SS_UNCONNECTED) { | |
933 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
934 | mask |= POLLOUT | POLLWRNORM; | |
935 | ||
936 | } | |
937 | ||
938 | release_sock(sk); | |
939 | } | |
940 | ||
941 | return mask; | |
942 | } | |
943 | ||
944 | static int vsock_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
945 | struct msghdr *msg, size_t len) | |
946 | { | |
947 | int err; | |
948 | struct sock *sk; | |
949 | struct vsock_sock *vsk; | |
950 | struct sockaddr_vm *remote_addr; | |
951 | ||
952 | if (msg->msg_flags & MSG_OOB) | |
953 | return -EOPNOTSUPP; | |
954 | ||
955 | /* For now, MSG_DONTWAIT is always assumed... */ | |
956 | err = 0; | |
957 | sk = sock->sk; | |
958 | vsk = vsock_sk(sk); | |
959 | ||
960 | lock_sock(sk); | |
961 | ||
962 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
963 | struct sockaddr_vm local_addr; | |
964 | ||
965 | vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
966 | err = __vsock_bind(sk, &local_addr); | |
967 | if (err != 0) | |
968 | goto out; | |
969 | ||
970 | } | |
971 | ||
972 | /* If the provided message contains an address, use that. Otherwise | |
973 | * fall back on the socket's remote handle (if it has been connected). | |
974 | */ | |
975 | if (msg->msg_name && | |
976 | vsock_addr_cast(msg->msg_name, msg->msg_namelen, | |
977 | &remote_addr) == 0) { | |
978 | /* Ensure this address is of the right type and is a valid | |
979 | * destination. | |
980 | */ | |
981 | ||
982 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
983 | remote_addr->svm_cid = transport->get_local_cid(); | |
984 | ||
985 | if (!vsock_addr_bound(remote_addr)) { | |
986 | err = -EINVAL; | |
987 | goto out; | |
988 | } | |
989 | } else if (sock->state == SS_CONNECTED) { | |
990 | remote_addr = &vsk->remote_addr; | |
991 | ||
992 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
993 | remote_addr->svm_cid = transport->get_local_cid(); | |
994 | ||
995 | /* XXX Should connect() or this function ensure remote_addr is | |
996 | * bound? | |
997 | */ | |
998 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
999 | err = -EINVAL; | |
1000 | goto out; | |
1001 | } | |
1002 | } else { | |
1003 | err = -EINVAL; | |
1004 | goto out; | |
1005 | } | |
1006 | ||
1007 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1008 | remote_addr->svm_port)) { | |
1009 | err = -EINVAL; | |
1010 | goto out; | |
1011 | } | |
1012 | ||
1013 | err = transport->dgram_enqueue(vsk, remote_addr, msg->msg_iov, len); | |
1014 | ||
1015 | out: | |
1016 | release_sock(sk); | |
1017 | return err; | |
1018 | } | |
1019 | ||
1020 | static int vsock_dgram_connect(struct socket *sock, | |
1021 | struct sockaddr *addr, int addr_len, int flags) | |
1022 | { | |
1023 | int err; | |
1024 | struct sock *sk; | |
1025 | struct vsock_sock *vsk; | |
1026 | struct sockaddr_vm *remote_addr; | |
1027 | ||
1028 | sk = sock->sk; | |
1029 | vsk = vsock_sk(sk); | |
1030 | ||
1031 | err = vsock_addr_cast(addr, addr_len, &remote_addr); | |
1032 | if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { | |
1033 | lock_sock(sk); | |
1034 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, | |
1035 | VMADDR_PORT_ANY); | |
1036 | sock->state = SS_UNCONNECTED; | |
1037 | release_sock(sk); | |
1038 | return 0; | |
1039 | } else if (err != 0) | |
1040 | return -EINVAL; | |
1041 | ||
1042 | lock_sock(sk); | |
1043 | ||
1044 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1045 | struct sockaddr_vm local_addr; | |
1046 | ||
1047 | vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
1048 | err = __vsock_bind(sk, &local_addr); | |
1049 | if (err != 0) | |
1050 | goto out; | |
1051 | ||
1052 | } | |
1053 | ||
1054 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1055 | remote_addr->svm_port)) { | |
1056 | err = -EINVAL; | |
1057 | goto out; | |
1058 | } | |
1059 | ||
1060 | memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); | |
1061 | sock->state = SS_CONNECTED; | |
1062 | ||
1063 | out: | |
1064 | release_sock(sk); | |
1065 | return err; | |
1066 | } | |
1067 | ||
1068 | static int vsock_dgram_recvmsg(struct kiocb *kiocb, struct socket *sock, | |
1069 | struct msghdr *msg, size_t len, int flags) | |
1070 | { | |
1071 | return transport->dgram_dequeue(kiocb, vsock_sk(sock->sk), msg, len, | |
1072 | flags); | |
1073 | } | |
1074 | ||
1075 | static const struct proto_ops vsock_dgram_ops = { | |
1076 | .family = PF_VSOCK, | |
1077 | .owner = THIS_MODULE, | |
1078 | .release = vsock_release, | |
1079 | .bind = vsock_bind, | |
1080 | .connect = vsock_dgram_connect, | |
1081 | .socketpair = sock_no_socketpair, | |
1082 | .accept = sock_no_accept, | |
1083 | .getname = vsock_getname, | |
1084 | .poll = vsock_poll, | |
1085 | .ioctl = sock_no_ioctl, | |
1086 | .listen = sock_no_listen, | |
1087 | .shutdown = vsock_shutdown, | |
1088 | .setsockopt = sock_no_setsockopt, | |
1089 | .getsockopt = sock_no_getsockopt, | |
1090 | .sendmsg = vsock_dgram_sendmsg, | |
1091 | .recvmsg = vsock_dgram_recvmsg, | |
1092 | .mmap = sock_no_mmap, | |
1093 | .sendpage = sock_no_sendpage, | |
1094 | }; | |
1095 | ||
1096 | static void vsock_connect_timeout(struct work_struct *work) | |
1097 | { | |
1098 | struct sock *sk; | |
1099 | struct vsock_sock *vsk; | |
1100 | ||
1101 | vsk = container_of(work, struct vsock_sock, dwork.work); | |
1102 | sk = sk_vsock(vsk); | |
1103 | ||
1104 | lock_sock(sk); | |
1105 | if (sk->sk_state == SS_CONNECTING && | |
1106 | (sk->sk_shutdown != SHUTDOWN_MASK)) { | |
1107 | sk->sk_state = SS_UNCONNECTED; | |
1108 | sk->sk_err = ETIMEDOUT; | |
1109 | sk->sk_error_report(sk); | |
1110 | } | |
1111 | release_sock(sk); | |
1112 | ||
1113 | sock_put(sk); | |
1114 | } | |
1115 | ||
1116 | static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, | |
1117 | int addr_len, int flags) | |
1118 | { | |
1119 | int err; | |
1120 | struct sock *sk; | |
1121 | struct vsock_sock *vsk; | |
1122 | struct sockaddr_vm *remote_addr; | |
1123 | long timeout; | |
1124 | DEFINE_WAIT(wait); | |
1125 | ||
1126 | err = 0; | |
1127 | sk = sock->sk; | |
1128 | vsk = vsock_sk(sk); | |
1129 | ||
1130 | lock_sock(sk); | |
1131 | ||
1132 | /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ | |
1133 | switch (sock->state) { | |
1134 | case SS_CONNECTED: | |
1135 | err = -EISCONN; | |
1136 | goto out; | |
1137 | case SS_DISCONNECTING: | |
1138 | err = -EINVAL; | |
1139 | goto out; | |
1140 | case SS_CONNECTING: | |
1141 | /* This continues on so we can move sock into the SS_CONNECTED | |
1142 | * state once the connection has completed (at which point err | |
1143 | * will be set to zero also). Otherwise, we will either wait | |
1144 | * for the connection or return -EALREADY should this be a | |
1145 | * non-blocking call. | |
1146 | */ | |
1147 | err = -EALREADY; | |
1148 | break; | |
1149 | default: | |
1150 | if ((sk->sk_state == SS_LISTEN) || | |
1151 | vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { | |
1152 | err = -EINVAL; | |
1153 | goto out; | |
1154 | } | |
1155 | ||
1156 | /* The hypervisor and well-known contexts do not have socket | |
1157 | * endpoints. | |
1158 | */ | |
1159 | if (!transport->stream_allow(remote_addr->svm_cid, | |
1160 | remote_addr->svm_port)) { | |
1161 | err = -ENETUNREACH; | |
1162 | goto out; | |
1163 | } | |
1164 | ||
1165 | /* Set the remote address that we are connecting to. */ | |
1166 | memcpy(&vsk->remote_addr, remote_addr, | |
1167 | sizeof(vsk->remote_addr)); | |
1168 | ||
1169 | /* Autobind this socket to the local address if necessary. */ | |
1170 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1171 | struct sockaddr_vm local_addr; | |
1172 | ||
1173 | vsock_addr_init(&local_addr, VMADDR_CID_ANY, | |
1174 | VMADDR_PORT_ANY); | |
1175 | err = __vsock_bind(sk, &local_addr); | |
1176 | if (err != 0) | |
1177 | goto out; | |
1178 | ||
1179 | } | |
1180 | ||
1181 | sk->sk_state = SS_CONNECTING; | |
1182 | ||
1183 | err = transport->connect(vsk); | |
1184 | if (err < 0) | |
1185 | goto out; | |
1186 | ||
1187 | /* Mark sock as connecting and set the error code to in | |
1188 | * progress in case this is a non-blocking connect. | |
1189 | */ | |
1190 | sock->state = SS_CONNECTING; | |
1191 | err = -EINPROGRESS; | |
1192 | } | |
1193 | ||
1194 | /* The receive path will handle all communication until we are able to | |
1195 | * enter the connected state. Here we wait for the connection to be | |
1196 | * completed or a notification of an error. | |
1197 | */ | |
1198 | timeout = vsk->connect_timeout; | |
1199 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1200 | ||
1201 | while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) { | |
1202 | if (flags & O_NONBLOCK) { | |
1203 | /* If we're not going to block, we schedule a timeout | |
1204 | * function to generate a timeout on the connection | |
1205 | * attempt, in case the peer doesn't respond in a | |
1206 | * timely manner. We hold on to the socket until the | |
1207 | * timeout fires. | |
1208 | */ | |
1209 | sock_hold(sk); | |
1210 | INIT_DELAYED_WORK(&vsk->dwork, | |
1211 | vsock_connect_timeout); | |
1212 | schedule_delayed_work(&vsk->dwork, timeout); | |
1213 | ||
1214 | /* Skip ahead to preserve error code set above. */ | |
1215 | goto out_wait; | |
1216 | } | |
1217 | ||
1218 | release_sock(sk); | |
1219 | timeout = schedule_timeout(timeout); | |
1220 | lock_sock(sk); | |
1221 | ||
1222 | if (signal_pending(current)) { | |
1223 | err = sock_intr_errno(timeout); | |
1224 | goto out_wait_error; | |
1225 | } else if (timeout == 0) { | |
1226 | err = -ETIMEDOUT; | |
1227 | goto out_wait_error; | |
1228 | } | |
1229 | ||
1230 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1231 | } | |
1232 | ||
1233 | if (sk->sk_err) { | |
1234 | err = -sk->sk_err; | |
1235 | goto out_wait_error; | |
1236 | } else | |
1237 | err = 0; | |
1238 | ||
1239 | out_wait: | |
1240 | finish_wait(sk_sleep(sk), &wait); | |
1241 | out: | |
1242 | release_sock(sk); | |
1243 | return err; | |
1244 | ||
1245 | out_wait_error: | |
1246 | sk->sk_state = SS_UNCONNECTED; | |
1247 | sock->state = SS_UNCONNECTED; | |
1248 | goto out_wait; | |
1249 | } | |
1250 | ||
1251 | static int vsock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1252 | { | |
1253 | struct sock *listener; | |
1254 | int err; | |
1255 | struct sock *connected; | |
1256 | struct vsock_sock *vconnected; | |
1257 | long timeout; | |
1258 | DEFINE_WAIT(wait); | |
1259 | ||
1260 | err = 0; | |
1261 | listener = sock->sk; | |
1262 | ||
1263 | lock_sock(listener); | |
1264 | ||
1265 | if (sock->type != SOCK_STREAM) { | |
1266 | err = -EOPNOTSUPP; | |
1267 | goto out; | |
1268 | } | |
1269 | ||
1270 | if (listener->sk_state != SS_LISTEN) { | |
1271 | err = -EINVAL; | |
1272 | goto out; | |
1273 | } | |
1274 | ||
1275 | /* Wait for children sockets to appear; these are the new sockets | |
1276 | * created upon connection establishment. | |
1277 | */ | |
1278 | timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); | |
1279 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1280 | ||
1281 | while ((connected = vsock_dequeue_accept(listener)) == NULL && | |
1282 | listener->sk_err == 0) { | |
1283 | release_sock(listener); | |
1284 | timeout = schedule_timeout(timeout); | |
1285 | lock_sock(listener); | |
1286 | ||
1287 | if (signal_pending(current)) { | |
1288 | err = sock_intr_errno(timeout); | |
1289 | goto out_wait; | |
1290 | } else if (timeout == 0) { | |
1291 | err = -EAGAIN; | |
1292 | goto out_wait; | |
1293 | } | |
1294 | ||
1295 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1296 | } | |
1297 | ||
1298 | if (listener->sk_err) | |
1299 | err = -listener->sk_err; | |
1300 | ||
1301 | if (connected) { | |
1302 | listener->sk_ack_backlog--; | |
1303 | ||
1304 | lock_sock(connected); | |
1305 | vconnected = vsock_sk(connected); | |
1306 | ||
1307 | /* If the listener socket has received an error, then we should | |
1308 | * reject this socket and return. Note that we simply mark the | |
1309 | * socket rejected, drop our reference, and let the cleanup | |
1310 | * function handle the cleanup; the fact that we found it in | |
1311 | * the listener's accept queue guarantees that the cleanup | |
1312 | * function hasn't run yet. | |
1313 | */ | |
1314 | if (err) { | |
1315 | vconnected->rejected = true; | |
1316 | release_sock(connected); | |
1317 | sock_put(connected); | |
1318 | goto out_wait; | |
1319 | } | |
1320 | ||
1321 | newsock->state = SS_CONNECTED; | |
1322 | sock_graft(connected, newsock); | |
1323 | release_sock(connected); | |
1324 | sock_put(connected); | |
1325 | } | |
1326 | ||
1327 | out_wait: | |
1328 | finish_wait(sk_sleep(listener), &wait); | |
1329 | out: | |
1330 | release_sock(listener); | |
1331 | return err; | |
1332 | } | |
1333 | ||
1334 | static int vsock_listen(struct socket *sock, int backlog) | |
1335 | { | |
1336 | int err; | |
1337 | struct sock *sk; | |
1338 | struct vsock_sock *vsk; | |
1339 | ||
1340 | sk = sock->sk; | |
1341 | ||
1342 | lock_sock(sk); | |
1343 | ||
1344 | if (sock->type != SOCK_STREAM) { | |
1345 | err = -EOPNOTSUPP; | |
1346 | goto out; | |
1347 | } | |
1348 | ||
1349 | if (sock->state != SS_UNCONNECTED) { | |
1350 | err = -EINVAL; | |
1351 | goto out; | |
1352 | } | |
1353 | ||
1354 | vsk = vsock_sk(sk); | |
1355 | ||
1356 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1357 | err = -EINVAL; | |
1358 | goto out; | |
1359 | } | |
1360 | ||
1361 | sk->sk_max_ack_backlog = backlog; | |
1362 | sk->sk_state = SS_LISTEN; | |
1363 | ||
1364 | err = 0; | |
1365 | ||
1366 | out: | |
1367 | release_sock(sk); | |
1368 | return err; | |
1369 | } | |
1370 | ||
1371 | static int vsock_stream_setsockopt(struct socket *sock, | |
1372 | int level, | |
1373 | int optname, | |
1374 | char __user *optval, | |
1375 | unsigned int optlen) | |
1376 | { | |
1377 | int err; | |
1378 | struct sock *sk; | |
1379 | struct vsock_sock *vsk; | |
1380 | u64 val; | |
1381 | ||
1382 | if (level != AF_VSOCK) | |
1383 | return -ENOPROTOOPT; | |
1384 | ||
1385 | #define COPY_IN(_v) \ | |
1386 | do { \ | |
1387 | if (optlen < sizeof(_v)) { \ | |
1388 | err = -EINVAL; \ | |
1389 | goto exit; \ | |
1390 | } \ | |
1391 | if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ | |
1392 | err = -EFAULT; \ | |
1393 | goto exit; \ | |
1394 | } \ | |
1395 | } while (0) | |
1396 | ||
1397 | err = 0; | |
1398 | sk = sock->sk; | |
1399 | vsk = vsock_sk(sk); | |
1400 | ||
1401 | lock_sock(sk); | |
1402 | ||
1403 | switch (optname) { | |
1404 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1405 | COPY_IN(val); | |
1406 | transport->set_buffer_size(vsk, val); | |
1407 | break; | |
1408 | ||
1409 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1410 | COPY_IN(val); | |
1411 | transport->set_max_buffer_size(vsk, val); | |
1412 | break; | |
1413 | ||
1414 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1415 | COPY_IN(val); | |
1416 | transport->set_min_buffer_size(vsk, val); | |
1417 | break; | |
1418 | ||
1419 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
1420 | struct timeval tv; | |
1421 | COPY_IN(tv); | |
1422 | if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && | |
1423 | tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { | |
1424 | vsk->connect_timeout = tv.tv_sec * HZ + | |
1425 | DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); | |
1426 | if (vsk->connect_timeout == 0) | |
1427 | vsk->connect_timeout = | |
1428 | VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
1429 | ||
1430 | } else { | |
1431 | err = -ERANGE; | |
1432 | } | |
1433 | break; | |
1434 | } | |
1435 | ||
1436 | default: | |
1437 | err = -ENOPROTOOPT; | |
1438 | break; | |
1439 | } | |
1440 | ||
1441 | #undef COPY_IN | |
1442 | ||
1443 | exit: | |
1444 | release_sock(sk); | |
1445 | return err; | |
1446 | } | |
1447 | ||
1448 | static int vsock_stream_getsockopt(struct socket *sock, | |
1449 | int level, int optname, | |
1450 | char __user *optval, | |
1451 | int __user *optlen) | |
1452 | { | |
1453 | int err; | |
1454 | int len; | |
1455 | struct sock *sk; | |
1456 | struct vsock_sock *vsk; | |
1457 | u64 val; | |
1458 | ||
1459 | if (level != AF_VSOCK) | |
1460 | return -ENOPROTOOPT; | |
1461 | ||
1462 | err = get_user(len, optlen); | |
1463 | if (err != 0) | |
1464 | return err; | |
1465 | ||
1466 | #define COPY_OUT(_v) \ | |
1467 | do { \ | |
1468 | if (len < sizeof(_v)) \ | |
1469 | return -EINVAL; \ | |
1470 | \ | |
1471 | len = sizeof(_v); \ | |
1472 | if (copy_to_user(optval, &_v, len) != 0) \ | |
1473 | return -EFAULT; \ | |
1474 | \ | |
1475 | } while (0) | |
1476 | ||
1477 | err = 0; | |
1478 | sk = sock->sk; | |
1479 | vsk = vsock_sk(sk); | |
1480 | ||
1481 | switch (optname) { | |
1482 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1483 | val = transport->get_buffer_size(vsk); | |
1484 | COPY_OUT(val); | |
1485 | break; | |
1486 | ||
1487 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1488 | val = transport->get_max_buffer_size(vsk); | |
1489 | COPY_OUT(val); | |
1490 | break; | |
1491 | ||
1492 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1493 | val = transport->get_min_buffer_size(vsk); | |
1494 | COPY_OUT(val); | |
1495 | break; | |
1496 | ||
1497 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
1498 | struct timeval tv; | |
1499 | tv.tv_sec = vsk->connect_timeout / HZ; | |
1500 | tv.tv_usec = | |
1501 | (vsk->connect_timeout - | |
1502 | tv.tv_sec * HZ) * (1000000 / HZ); | |
1503 | COPY_OUT(tv); | |
1504 | break; | |
1505 | } | |
1506 | default: | |
1507 | return -ENOPROTOOPT; | |
1508 | } | |
1509 | ||
1510 | err = put_user(len, optlen); | |
1511 | if (err != 0) | |
1512 | return -EFAULT; | |
1513 | ||
1514 | #undef COPY_OUT | |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | static int vsock_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1520 | struct msghdr *msg, size_t len) | |
1521 | { | |
1522 | struct sock *sk; | |
1523 | struct vsock_sock *vsk; | |
1524 | ssize_t total_written; | |
1525 | long timeout; | |
1526 | int err; | |
1527 | struct vsock_transport_send_notify_data send_data; | |
1528 | ||
1529 | DEFINE_WAIT(wait); | |
1530 | ||
1531 | sk = sock->sk; | |
1532 | vsk = vsock_sk(sk); | |
1533 | total_written = 0; | |
1534 | err = 0; | |
1535 | ||
1536 | if (msg->msg_flags & MSG_OOB) | |
1537 | return -EOPNOTSUPP; | |
1538 | ||
1539 | lock_sock(sk); | |
1540 | ||
1541 | /* Callers should not provide a destination with stream sockets. */ | |
1542 | if (msg->msg_namelen) { | |
1543 | err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP; | |
1544 | goto out; | |
1545 | } | |
1546 | ||
1547 | /* Send data only if both sides are not shutdown in the direction. */ | |
1548 | if (sk->sk_shutdown & SEND_SHUTDOWN || | |
1549 | vsk->peer_shutdown & RCV_SHUTDOWN) { | |
1550 | err = -EPIPE; | |
1551 | goto out; | |
1552 | } | |
1553 | ||
1554 | if (sk->sk_state != SS_CONNECTED || | |
1555 | !vsock_addr_bound(&vsk->local_addr)) { | |
1556 | err = -ENOTCONN; | |
1557 | goto out; | |
1558 | } | |
1559 | ||
1560 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1561 | err = -EDESTADDRREQ; | |
1562 | goto out; | |
1563 | } | |
1564 | ||
1565 | /* Wait for room in the produce queue to enqueue our user's data. */ | |
1566 | timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1567 | ||
1568 | err = transport->notify_send_init(vsk, &send_data); | |
1569 | if (err < 0) | |
1570 | goto out; | |
1571 | ||
1572 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1573 | ||
1574 | while (total_written < len) { | |
1575 | ssize_t written; | |
1576 | ||
1577 | while (vsock_stream_has_space(vsk) == 0 && | |
1578 | sk->sk_err == 0 && | |
1579 | !(sk->sk_shutdown & SEND_SHUTDOWN) && | |
1580 | !(vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1581 | ||
1582 | /* Don't wait for non-blocking sockets. */ | |
1583 | if (timeout == 0) { | |
1584 | err = -EAGAIN; | |
1585 | goto out_wait; | |
1586 | } | |
1587 | ||
1588 | err = transport->notify_send_pre_block(vsk, &send_data); | |
1589 | if (err < 0) | |
1590 | goto out_wait; | |
1591 | ||
1592 | release_sock(sk); | |
1593 | timeout = schedule_timeout(timeout); | |
1594 | lock_sock(sk); | |
1595 | if (signal_pending(current)) { | |
1596 | err = sock_intr_errno(timeout); | |
1597 | goto out_wait; | |
1598 | } else if (timeout == 0) { | |
1599 | err = -EAGAIN; | |
1600 | goto out_wait; | |
1601 | } | |
1602 | ||
1603 | prepare_to_wait(sk_sleep(sk), &wait, | |
1604 | TASK_INTERRUPTIBLE); | |
1605 | } | |
1606 | ||
1607 | /* These checks occur both as part of and after the loop | |
1608 | * conditional since we need to check before and after | |
1609 | * sleeping. | |
1610 | */ | |
1611 | if (sk->sk_err) { | |
1612 | err = -sk->sk_err; | |
1613 | goto out_wait; | |
1614 | } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || | |
1615 | (vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1616 | err = -EPIPE; | |
1617 | goto out_wait; | |
1618 | } | |
1619 | ||
1620 | err = transport->notify_send_pre_enqueue(vsk, &send_data); | |
1621 | if (err < 0) | |
1622 | goto out_wait; | |
1623 | ||
1624 | /* Note that enqueue will only write as many bytes as are free | |
1625 | * in the produce queue, so we don't need to ensure len is | |
1626 | * smaller than the queue size. It is the caller's | |
1627 | * responsibility to check how many bytes we were able to send. | |
1628 | */ | |
1629 | ||
1630 | written = transport->stream_enqueue( | |
1631 | vsk, msg->msg_iov, | |
1632 | len - total_written); | |
1633 | if (written < 0) { | |
1634 | err = -ENOMEM; | |
1635 | goto out_wait; | |
1636 | } | |
1637 | ||
1638 | total_written += written; | |
1639 | ||
1640 | err = transport->notify_send_post_enqueue( | |
1641 | vsk, written, &send_data); | |
1642 | if (err < 0) | |
1643 | goto out_wait; | |
1644 | ||
1645 | } | |
1646 | ||
1647 | out_wait: | |
1648 | if (total_written > 0) | |
1649 | err = total_written; | |
1650 | finish_wait(sk_sleep(sk), &wait); | |
1651 | out: | |
1652 | release_sock(sk); | |
1653 | return err; | |
1654 | } | |
1655 | ||
1656 | ||
1657 | static int | |
1658 | vsock_stream_recvmsg(struct kiocb *kiocb, | |
1659 | struct socket *sock, | |
1660 | struct msghdr *msg, size_t len, int flags) | |
1661 | { | |
1662 | struct sock *sk; | |
1663 | struct vsock_sock *vsk; | |
1664 | int err; | |
1665 | size_t target; | |
1666 | ssize_t copied; | |
1667 | long timeout; | |
1668 | struct vsock_transport_recv_notify_data recv_data; | |
1669 | ||
1670 | DEFINE_WAIT(wait); | |
1671 | ||
1672 | sk = sock->sk; | |
1673 | vsk = vsock_sk(sk); | |
1674 | err = 0; | |
1675 | ||
1676 | lock_sock(sk); | |
1677 | ||
1678 | if (sk->sk_state != SS_CONNECTED) { | |
1679 | /* Recvmsg is supposed to return 0 if a peer performs an | |
1680 | * orderly shutdown. Differentiate between that case and when a | |
1681 | * peer has not connected or a local shutdown occured with the | |
1682 | * SOCK_DONE flag. | |
1683 | */ | |
1684 | if (sock_flag(sk, SOCK_DONE)) | |
1685 | err = 0; | |
1686 | else | |
1687 | err = -ENOTCONN; | |
1688 | ||
1689 | goto out; | |
1690 | } | |
1691 | ||
1692 | if (flags & MSG_OOB) { | |
1693 | err = -EOPNOTSUPP; | |
1694 | goto out; | |
1695 | } | |
1696 | ||
1697 | /* We don't check peer_shutdown flag here since peer may actually shut | |
1698 | * down, but there can be data in the queue that a local socket can | |
1699 | * receive. | |
1700 | */ | |
1701 | if (sk->sk_shutdown & RCV_SHUTDOWN) { | |
1702 | err = 0; | |
1703 | goto out; | |
1704 | } | |
1705 | ||
1706 | /* It is valid on Linux to pass in a zero-length receive buffer. This | |
1707 | * is not an error. We may as well bail out now. | |
1708 | */ | |
1709 | if (!len) { | |
1710 | err = 0; | |
1711 | goto out; | |
1712 | } | |
1713 | ||
1714 | /* We must not copy less than target bytes into the user's buffer | |
1715 | * before returning successfully, so we wait for the consume queue to | |
1716 | * have that much data to consume before dequeueing. Note that this | |
1717 | * makes it impossible to handle cases where target is greater than the | |
1718 | * queue size. | |
1719 | */ | |
1720 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1721 | if (target >= transport->stream_rcvhiwat(vsk)) { | |
1722 | err = -ENOMEM; | |
1723 | goto out; | |
1724 | } | |
1725 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1726 | copied = 0; | |
1727 | ||
1728 | err = transport->notify_recv_init(vsk, target, &recv_data); | |
1729 | if (err < 0) | |
1730 | goto out; | |
1731 | ||
1732 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1733 | ||
1734 | while (1) { | |
1735 | s64 ready = vsock_stream_has_data(vsk); | |
1736 | ||
1737 | if (ready < 0) { | |
1738 | /* Invalid queue pair content. XXX This should be | |
1739 | * changed to a connection reset in a later change. | |
1740 | */ | |
1741 | ||
1742 | err = -ENOMEM; | |
1743 | goto out_wait; | |
1744 | } else if (ready > 0) { | |
1745 | ssize_t read; | |
1746 | ||
1747 | err = transport->notify_recv_pre_dequeue( | |
1748 | vsk, target, &recv_data); | |
1749 | if (err < 0) | |
1750 | break; | |
1751 | ||
1752 | read = transport->stream_dequeue( | |
1753 | vsk, msg->msg_iov, | |
1754 | len - copied, flags); | |
1755 | if (read < 0) { | |
1756 | err = -ENOMEM; | |
1757 | break; | |
1758 | } | |
1759 | ||
1760 | copied += read; | |
1761 | ||
1762 | err = transport->notify_recv_post_dequeue( | |
1763 | vsk, target, read, | |
1764 | !(flags & MSG_PEEK), &recv_data); | |
1765 | if (err < 0) | |
1766 | goto out_wait; | |
1767 | ||
1768 | if (read >= target || flags & MSG_PEEK) | |
1769 | break; | |
1770 | ||
1771 | target -= read; | |
1772 | } else { | |
1773 | if (sk->sk_err != 0 || (sk->sk_shutdown & RCV_SHUTDOWN) | |
1774 | || (vsk->peer_shutdown & SEND_SHUTDOWN)) { | |
1775 | break; | |
1776 | } | |
1777 | /* Don't wait for non-blocking sockets. */ | |
1778 | if (timeout == 0) { | |
1779 | err = -EAGAIN; | |
1780 | break; | |
1781 | } | |
1782 | ||
1783 | err = transport->notify_recv_pre_block( | |
1784 | vsk, target, &recv_data); | |
1785 | if (err < 0) | |
1786 | break; | |
1787 | ||
1788 | release_sock(sk); | |
1789 | timeout = schedule_timeout(timeout); | |
1790 | lock_sock(sk); | |
1791 | ||
1792 | if (signal_pending(current)) { | |
1793 | err = sock_intr_errno(timeout); | |
1794 | break; | |
1795 | } else if (timeout == 0) { | |
1796 | err = -EAGAIN; | |
1797 | break; | |
1798 | } | |
1799 | ||
1800 | prepare_to_wait(sk_sleep(sk), &wait, | |
1801 | TASK_INTERRUPTIBLE); | |
1802 | } | |
1803 | } | |
1804 | ||
1805 | if (sk->sk_err) | |
1806 | err = -sk->sk_err; | |
1807 | else if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1808 | err = 0; | |
1809 | ||
1810 | if (copied > 0) { | |
1811 | /* We only do these additional bookkeeping/notification steps | |
1812 | * if we actually copied something out of the queue pair | |
1813 | * instead of just peeking ahead. | |
1814 | */ | |
1815 | ||
1816 | if (!(flags & MSG_PEEK)) { | |
1817 | /* If the other side has shutdown for sending and there | |
1818 | * is nothing more to read, then modify the socket | |
1819 | * state. | |
1820 | */ | |
1821 | if (vsk->peer_shutdown & SEND_SHUTDOWN) { | |
1822 | if (vsock_stream_has_data(vsk) <= 0) { | |
1823 | sk->sk_state = SS_UNCONNECTED; | |
1824 | sock_set_flag(sk, SOCK_DONE); | |
1825 | sk->sk_state_change(sk); | |
1826 | } | |
1827 | } | |
1828 | } | |
1829 | err = copied; | |
1830 | } | |
1831 | ||
1832 | out_wait: | |
1833 | finish_wait(sk_sleep(sk), &wait); | |
1834 | out: | |
1835 | release_sock(sk); | |
1836 | return err; | |
1837 | } | |
1838 | ||
1839 | static const struct proto_ops vsock_stream_ops = { | |
1840 | .family = PF_VSOCK, | |
1841 | .owner = THIS_MODULE, | |
1842 | .release = vsock_release, | |
1843 | .bind = vsock_bind, | |
1844 | .connect = vsock_stream_connect, | |
1845 | .socketpair = sock_no_socketpair, | |
1846 | .accept = vsock_accept, | |
1847 | .getname = vsock_getname, | |
1848 | .poll = vsock_poll, | |
1849 | .ioctl = sock_no_ioctl, | |
1850 | .listen = vsock_listen, | |
1851 | .shutdown = vsock_shutdown, | |
1852 | .setsockopt = vsock_stream_setsockopt, | |
1853 | .getsockopt = vsock_stream_getsockopt, | |
1854 | .sendmsg = vsock_stream_sendmsg, | |
1855 | .recvmsg = vsock_stream_recvmsg, | |
1856 | .mmap = sock_no_mmap, | |
1857 | .sendpage = sock_no_sendpage, | |
1858 | }; | |
1859 | ||
1860 | static int vsock_create(struct net *net, struct socket *sock, | |
1861 | int protocol, int kern) | |
1862 | { | |
1863 | if (!sock) | |
1864 | return -EINVAL; | |
1865 | ||
1866 | if (protocol) | |
1867 | return -EPROTONOSUPPORT; | |
1868 | ||
1869 | switch (sock->type) { | |
1870 | case SOCK_DGRAM: | |
1871 | sock->ops = &vsock_dgram_ops; | |
1872 | break; | |
1873 | case SOCK_STREAM: | |
1874 | sock->ops = &vsock_stream_ops; | |
1875 | break; | |
1876 | default: | |
1877 | return -ESOCKTNOSUPPORT; | |
1878 | } | |
1879 | ||
1880 | sock->state = SS_UNCONNECTED; | |
1881 | ||
1882 | return __vsock_create(net, sock, NULL, GFP_KERNEL, 0) ? 0 : -ENOMEM; | |
1883 | } | |
1884 | ||
1885 | static const struct net_proto_family vsock_family_ops = { | |
1886 | .family = AF_VSOCK, | |
1887 | .create = vsock_create, | |
1888 | .owner = THIS_MODULE, | |
1889 | }; | |
1890 | ||
1891 | static long vsock_dev_do_ioctl(struct file *filp, | |
1892 | unsigned int cmd, void __user *ptr) | |
1893 | { | |
1894 | u32 __user *p = ptr; | |
1895 | int retval = 0; | |
1896 | ||
1897 | switch (cmd) { | |
1898 | case IOCTL_VM_SOCKETS_GET_LOCAL_CID: | |
1899 | if (put_user(transport->get_local_cid(), p) != 0) | |
1900 | retval = -EFAULT; | |
1901 | break; | |
1902 | ||
1903 | default: | |
1904 | pr_err("Unknown ioctl %d\n", cmd); | |
1905 | retval = -EINVAL; | |
1906 | } | |
1907 | ||
1908 | return retval; | |
1909 | } | |
1910 | ||
1911 | static long vsock_dev_ioctl(struct file *filp, | |
1912 | unsigned int cmd, unsigned long arg) | |
1913 | { | |
1914 | return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); | |
1915 | } | |
1916 | ||
1917 | #ifdef CONFIG_COMPAT | |
1918 | static long vsock_dev_compat_ioctl(struct file *filp, | |
1919 | unsigned int cmd, unsigned long arg) | |
1920 | { | |
1921 | return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); | |
1922 | } | |
1923 | #endif | |
1924 | ||
1925 | static const struct file_operations vsock_device_ops = { | |
1926 | .owner = THIS_MODULE, | |
1927 | .unlocked_ioctl = vsock_dev_ioctl, | |
1928 | #ifdef CONFIG_COMPAT | |
1929 | .compat_ioctl = vsock_dev_compat_ioctl, | |
1930 | #endif | |
1931 | .open = nonseekable_open, | |
1932 | }; | |
1933 | ||
1934 | static struct miscdevice vsock_device = { | |
1935 | .name = "vsock", | |
1936 | .minor = MISC_DYNAMIC_MINOR, | |
1937 | .fops = &vsock_device_ops, | |
1938 | }; | |
1939 | ||
1940 | static int __vsock_core_init(void) | |
1941 | { | |
1942 | int err; | |
1943 | ||
1944 | vsock_init_tables(); | |
1945 | ||
1946 | err = misc_register(&vsock_device); | |
1947 | if (err) { | |
1948 | pr_err("Failed to register misc device\n"); | |
1949 | return -ENOENT; | |
1950 | } | |
1951 | ||
1952 | err = proto_register(&vsock_proto, 1); /* we want our slab */ | |
1953 | if (err) { | |
1954 | pr_err("Cannot register vsock protocol\n"); | |
1955 | goto err_misc_deregister; | |
1956 | } | |
1957 | ||
1958 | err = sock_register(&vsock_family_ops); | |
1959 | if (err) { | |
1960 | pr_err("could not register af_vsock (%d) address family: %d\n", | |
1961 | AF_VSOCK, err); | |
1962 | goto err_unregister_proto; | |
1963 | } | |
1964 | ||
1965 | return 0; | |
1966 | ||
1967 | err_unregister_proto: | |
1968 | proto_unregister(&vsock_proto); | |
1969 | err_misc_deregister: | |
1970 | misc_deregister(&vsock_device); | |
1971 | return err; | |
1972 | } | |
1973 | ||
1974 | int vsock_core_init(const struct vsock_transport *t) | |
1975 | { | |
1976 | int retval = mutex_lock_interruptible(&vsock_register_mutex); | |
1977 | if (retval) | |
1978 | return retval; | |
1979 | ||
1980 | if (transport) { | |
1981 | retval = -EBUSY; | |
1982 | goto out; | |
1983 | } | |
1984 | ||
1985 | transport = t; | |
1986 | retval = __vsock_core_init(); | |
1987 | if (retval) | |
1988 | transport = NULL; | |
1989 | ||
1990 | out: | |
1991 | mutex_unlock(&vsock_register_mutex); | |
1992 | return retval; | |
1993 | } | |
1994 | EXPORT_SYMBOL_GPL(vsock_core_init); | |
1995 | ||
1996 | void vsock_core_exit(void) | |
1997 | { | |
1998 | mutex_lock(&vsock_register_mutex); | |
1999 | ||
2000 | misc_deregister(&vsock_device); | |
2001 | sock_unregister(AF_VSOCK); | |
2002 | proto_unregister(&vsock_proto); | |
2003 | ||
2004 | /* We do not want the assignment below re-ordered. */ | |
2005 | mb(); | |
2006 | transport = NULL; | |
2007 | ||
2008 | mutex_unlock(&vsock_register_mutex); | |
2009 | } | |
2010 | EXPORT_SYMBOL_GPL(vsock_core_exit); | |
2011 | ||
2012 | MODULE_AUTHOR("VMware, Inc."); | |
2013 | MODULE_DESCRIPTION("VMware Virtual Socket Family"); | |
2014 | MODULE_VERSION(VSOCK_DRIVER_VERSION_STRING); | |
2015 | MODULE_LICENSE("GPL v2"); |