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d021c344 AK |
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> | |
d021c344 AK |
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" | |
d021c344 AK |
101 | |
102 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); | |
103 | static void vsock_sk_destruct(struct sock *sk); | |
104 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); | |
105 | ||
106 | /* Protocol family. */ | |
107 | static 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 | ||
120 | static const struct vsock_transport *transport; | |
121 | static DEFINE_MUTEX(vsock_register_mutex); | |
122 | ||
123 | /**** EXPORTS ****/ | |
124 | ||
125 | /* Get the ID of the local context. This is transport dependent. */ | |
126 | ||
127 | int vm_sockets_get_local_cid(void) | |
128 | { | |
129 | return transport->get_local_cid(); | |
130 | } | |
131 | EXPORT_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 | |
a49dd9dc | 147 | * mods with VSOCK_HASH_SIZE to ensure this. |
d021c344 AK |
148 | */ |
149 | #define VSOCK_HASH_SIZE 251 | |
150 | #define MAX_PORT_RETRIES 24 | |
151 | ||
a49dd9dc | 152 | #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) |
d021c344 AK |
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) \ | |
a49dd9dc | 158 | (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) |
d021c344 AK |
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 | ||
164 | static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; | |
165 | static struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; | |
166 | static DEFINE_SPINLOCK(vsock_table_lock); | |
167 | ||
b3a6dfe8 AH |
168 | /* Autobind this socket to the local address if necessary. */ |
169 | static int vsock_auto_bind(struct vsock_sock *vsk) | |
170 | { | |
171 | struct sock *sk = sk_vsock(vsk); | |
172 | struct sockaddr_vm local_addr; | |
173 | ||
174 | if (vsock_addr_bound(&vsk->local_addr)) | |
175 | return 0; | |
176 | vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
177 | return __vsock_bind(sk, &local_addr); | |
178 | } | |
179 | ||
22ee3b57 | 180 | static void vsock_init_tables(void) |
d021c344 AK |
181 | { |
182 | int i; | |
183 | ||
184 | for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) | |
185 | INIT_LIST_HEAD(&vsock_bind_table[i]); | |
186 | ||
187 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) | |
188 | INIT_LIST_HEAD(&vsock_connected_table[i]); | |
189 | } | |
190 | ||
191 | static void __vsock_insert_bound(struct list_head *list, | |
192 | struct vsock_sock *vsk) | |
193 | { | |
194 | sock_hold(&vsk->sk); | |
195 | list_add(&vsk->bound_table, list); | |
196 | } | |
197 | ||
198 | static void __vsock_insert_connected(struct list_head *list, | |
199 | struct vsock_sock *vsk) | |
200 | { | |
201 | sock_hold(&vsk->sk); | |
202 | list_add(&vsk->connected_table, list); | |
203 | } | |
204 | ||
205 | static void __vsock_remove_bound(struct vsock_sock *vsk) | |
206 | { | |
207 | list_del_init(&vsk->bound_table); | |
208 | sock_put(&vsk->sk); | |
209 | } | |
210 | ||
211 | static void __vsock_remove_connected(struct vsock_sock *vsk) | |
212 | { | |
213 | list_del_init(&vsk->connected_table); | |
214 | sock_put(&vsk->sk); | |
215 | } | |
216 | ||
217 | static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) | |
218 | { | |
219 | struct vsock_sock *vsk; | |
220 | ||
221 | list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) | |
990454b5 | 222 | if (addr->svm_port == vsk->local_addr.svm_port) |
d021c344 AK |
223 | return sk_vsock(vsk); |
224 | ||
225 | return NULL; | |
226 | } | |
227 | ||
228 | static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, | |
229 | struct sockaddr_vm *dst) | |
230 | { | |
231 | struct vsock_sock *vsk; | |
232 | ||
233 | list_for_each_entry(vsk, vsock_connected_sockets(src, dst), | |
234 | connected_table) { | |
990454b5 RG |
235 | if (vsock_addr_equals_addr(src, &vsk->remote_addr) && |
236 | dst->svm_port == vsk->local_addr.svm_port) { | |
d021c344 AK |
237 | return sk_vsock(vsk); |
238 | } | |
239 | } | |
240 | ||
241 | return NULL; | |
242 | } | |
243 | ||
244 | static bool __vsock_in_bound_table(struct vsock_sock *vsk) | |
245 | { | |
246 | return !list_empty(&vsk->bound_table); | |
247 | } | |
248 | ||
249 | static bool __vsock_in_connected_table(struct vsock_sock *vsk) | |
250 | { | |
251 | return !list_empty(&vsk->connected_table); | |
252 | } | |
253 | ||
254 | static void vsock_insert_unbound(struct vsock_sock *vsk) | |
255 | { | |
256 | spin_lock_bh(&vsock_table_lock); | |
257 | __vsock_insert_bound(vsock_unbound_sockets, vsk); | |
258 | spin_unlock_bh(&vsock_table_lock); | |
259 | } | |
260 | ||
261 | void vsock_insert_connected(struct vsock_sock *vsk) | |
262 | { | |
263 | struct list_head *list = vsock_connected_sockets( | |
264 | &vsk->remote_addr, &vsk->local_addr); | |
265 | ||
266 | spin_lock_bh(&vsock_table_lock); | |
267 | __vsock_insert_connected(list, vsk); | |
268 | spin_unlock_bh(&vsock_table_lock); | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(vsock_insert_connected); | |
271 | ||
272 | void vsock_remove_bound(struct vsock_sock *vsk) | |
273 | { | |
274 | spin_lock_bh(&vsock_table_lock); | |
275 | __vsock_remove_bound(vsk); | |
276 | spin_unlock_bh(&vsock_table_lock); | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(vsock_remove_bound); | |
279 | ||
280 | void vsock_remove_connected(struct vsock_sock *vsk) | |
281 | { | |
282 | spin_lock_bh(&vsock_table_lock); | |
283 | __vsock_remove_connected(vsk); | |
284 | spin_unlock_bh(&vsock_table_lock); | |
285 | } | |
286 | EXPORT_SYMBOL_GPL(vsock_remove_connected); | |
287 | ||
288 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) | |
289 | { | |
290 | struct sock *sk; | |
291 | ||
292 | spin_lock_bh(&vsock_table_lock); | |
293 | sk = __vsock_find_bound_socket(addr); | |
294 | if (sk) | |
295 | sock_hold(sk); | |
296 | ||
297 | spin_unlock_bh(&vsock_table_lock); | |
298 | ||
299 | return sk; | |
300 | } | |
301 | EXPORT_SYMBOL_GPL(vsock_find_bound_socket); | |
302 | ||
303 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, | |
304 | struct sockaddr_vm *dst) | |
305 | { | |
306 | struct sock *sk; | |
307 | ||
308 | spin_lock_bh(&vsock_table_lock); | |
309 | sk = __vsock_find_connected_socket(src, dst); | |
310 | if (sk) | |
311 | sock_hold(sk); | |
312 | ||
313 | spin_unlock_bh(&vsock_table_lock); | |
314 | ||
315 | return sk; | |
316 | } | |
317 | EXPORT_SYMBOL_GPL(vsock_find_connected_socket); | |
318 | ||
319 | static bool vsock_in_bound_table(struct vsock_sock *vsk) | |
320 | { | |
321 | bool ret; | |
322 | ||
323 | spin_lock_bh(&vsock_table_lock); | |
324 | ret = __vsock_in_bound_table(vsk); | |
325 | spin_unlock_bh(&vsock_table_lock); | |
326 | ||
327 | return ret; | |
328 | } | |
329 | ||
330 | static bool vsock_in_connected_table(struct vsock_sock *vsk) | |
331 | { | |
332 | bool ret; | |
333 | ||
334 | spin_lock_bh(&vsock_table_lock); | |
335 | ret = __vsock_in_connected_table(vsk); | |
336 | spin_unlock_bh(&vsock_table_lock); | |
337 | ||
338 | return ret; | |
339 | } | |
340 | ||
341 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) | |
342 | { | |
343 | int i; | |
344 | ||
345 | spin_lock_bh(&vsock_table_lock); | |
346 | ||
347 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { | |
348 | struct vsock_sock *vsk; | |
349 | list_for_each_entry(vsk, &vsock_connected_table[i], | |
d9af2d67 | 350 | connected_table) |
d021c344 AK |
351 | fn(sk_vsock(vsk)); |
352 | } | |
353 | ||
354 | spin_unlock_bh(&vsock_table_lock); | |
355 | } | |
356 | EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); | |
357 | ||
358 | void vsock_add_pending(struct sock *listener, struct sock *pending) | |
359 | { | |
360 | struct vsock_sock *vlistener; | |
361 | struct vsock_sock *vpending; | |
362 | ||
363 | vlistener = vsock_sk(listener); | |
364 | vpending = vsock_sk(pending); | |
365 | ||
366 | sock_hold(pending); | |
367 | sock_hold(listener); | |
368 | list_add_tail(&vpending->pending_links, &vlistener->pending_links); | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(vsock_add_pending); | |
371 | ||
372 | void vsock_remove_pending(struct sock *listener, struct sock *pending) | |
373 | { | |
374 | struct vsock_sock *vpending = vsock_sk(pending); | |
375 | ||
376 | list_del_init(&vpending->pending_links); | |
377 | sock_put(listener); | |
378 | sock_put(pending); | |
379 | } | |
380 | EXPORT_SYMBOL_GPL(vsock_remove_pending); | |
381 | ||
382 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected) | |
383 | { | |
384 | struct vsock_sock *vlistener; | |
385 | struct vsock_sock *vconnected; | |
386 | ||
387 | vlistener = vsock_sk(listener); | |
388 | vconnected = vsock_sk(connected); | |
389 | ||
390 | sock_hold(connected); | |
391 | sock_hold(listener); | |
392 | list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(vsock_enqueue_accept); | |
395 | ||
396 | static struct sock *vsock_dequeue_accept(struct sock *listener) | |
397 | { | |
398 | struct vsock_sock *vlistener; | |
399 | struct vsock_sock *vconnected; | |
400 | ||
401 | vlistener = vsock_sk(listener); | |
402 | ||
403 | if (list_empty(&vlistener->accept_queue)) | |
404 | return NULL; | |
405 | ||
406 | vconnected = list_entry(vlistener->accept_queue.next, | |
407 | struct vsock_sock, accept_queue); | |
408 | ||
409 | list_del_init(&vconnected->accept_queue); | |
410 | sock_put(listener); | |
411 | /* The caller will need a reference on the connected socket so we let | |
412 | * it call sock_put(). | |
413 | */ | |
414 | ||
415 | return sk_vsock(vconnected); | |
416 | } | |
417 | ||
418 | static bool vsock_is_accept_queue_empty(struct sock *sk) | |
419 | { | |
420 | struct vsock_sock *vsk = vsock_sk(sk); | |
421 | return list_empty(&vsk->accept_queue); | |
422 | } | |
423 | ||
424 | static bool vsock_is_pending(struct sock *sk) | |
425 | { | |
426 | struct vsock_sock *vsk = vsock_sk(sk); | |
427 | return !list_empty(&vsk->pending_links); | |
428 | } | |
429 | ||
430 | static int vsock_send_shutdown(struct sock *sk, int mode) | |
431 | { | |
432 | return transport->shutdown(vsock_sk(sk), mode); | |
433 | } | |
434 | ||
435 | void vsock_pending_work(struct work_struct *work) | |
436 | { | |
437 | struct sock *sk; | |
438 | struct sock *listener; | |
439 | struct vsock_sock *vsk; | |
440 | bool cleanup; | |
441 | ||
442 | vsk = container_of(work, struct vsock_sock, dwork.work); | |
443 | sk = sk_vsock(vsk); | |
444 | listener = vsk->listener; | |
445 | cleanup = true; | |
446 | ||
447 | lock_sock(listener); | |
448 | lock_sock(sk); | |
449 | ||
450 | if (vsock_is_pending(sk)) { | |
451 | vsock_remove_pending(listener, sk); | |
452 | } else if (!vsk->rejected) { | |
453 | /* We are not on the pending list and accept() did not reject | |
454 | * us, so we must have been accepted by our user process. We | |
455 | * just need to drop our references to the sockets and be on | |
456 | * our way. | |
457 | */ | |
458 | cleanup = false; | |
459 | goto out; | |
460 | } | |
461 | ||
462 | listener->sk_ack_backlog--; | |
463 | ||
464 | /* We need to remove ourself from the global connected sockets list so | |
465 | * incoming packets can't find this socket, and to reduce the reference | |
466 | * count. | |
467 | */ | |
468 | if (vsock_in_connected_table(vsk)) | |
469 | vsock_remove_connected(vsk); | |
470 | ||
471 | sk->sk_state = SS_FREE; | |
472 | ||
473 | out: | |
474 | release_sock(sk); | |
475 | release_sock(listener); | |
476 | if (cleanup) | |
477 | sock_put(sk); | |
478 | ||
479 | sock_put(sk); | |
480 | sock_put(listener); | |
481 | } | |
482 | EXPORT_SYMBOL_GPL(vsock_pending_work); | |
483 | ||
484 | /**** SOCKET OPERATIONS ****/ | |
485 | ||
486 | static int __vsock_bind_stream(struct vsock_sock *vsk, | |
487 | struct sockaddr_vm *addr) | |
488 | { | |
489 | static u32 port = LAST_RESERVED_PORT + 1; | |
490 | struct sockaddr_vm new_addr; | |
491 | ||
492 | vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); | |
493 | ||
494 | if (addr->svm_port == VMADDR_PORT_ANY) { | |
495 | bool found = false; | |
496 | unsigned int i; | |
497 | ||
498 | for (i = 0; i < MAX_PORT_RETRIES; i++) { | |
499 | if (port <= LAST_RESERVED_PORT) | |
500 | port = LAST_RESERVED_PORT + 1; | |
501 | ||
502 | new_addr.svm_port = port++; | |
503 | ||
504 | if (!__vsock_find_bound_socket(&new_addr)) { | |
505 | found = true; | |
506 | break; | |
507 | } | |
508 | } | |
509 | ||
510 | if (!found) | |
511 | return -EADDRNOTAVAIL; | |
512 | } else { | |
513 | /* If port is in reserved range, ensure caller | |
514 | * has necessary privileges. | |
515 | */ | |
516 | if (addr->svm_port <= LAST_RESERVED_PORT && | |
517 | !capable(CAP_NET_BIND_SERVICE)) { | |
518 | return -EACCES; | |
519 | } | |
520 | ||
521 | if (__vsock_find_bound_socket(&new_addr)) | |
522 | return -EADDRINUSE; | |
523 | } | |
524 | ||
525 | vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); | |
526 | ||
527 | /* Remove stream sockets from the unbound list and add them to the hash | |
528 | * table for easy lookup by its address. The unbound list is simply an | |
529 | * extra entry at the end of the hash table, a trick used by AF_UNIX. | |
530 | */ | |
531 | __vsock_remove_bound(vsk); | |
532 | __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); | |
533 | ||
534 | return 0; | |
535 | } | |
536 | ||
537 | static int __vsock_bind_dgram(struct vsock_sock *vsk, | |
538 | struct sockaddr_vm *addr) | |
539 | { | |
540 | return transport->dgram_bind(vsk, addr); | |
541 | } | |
542 | ||
543 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) | |
544 | { | |
545 | struct vsock_sock *vsk = vsock_sk(sk); | |
546 | u32 cid; | |
547 | int retval; | |
548 | ||
549 | /* First ensure this socket isn't already bound. */ | |
550 | if (vsock_addr_bound(&vsk->local_addr)) | |
551 | return -EINVAL; | |
552 | ||
553 | /* Now bind to the provided address or select appropriate values if | |
554 | * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that | |
555 | * like AF_INET prevents binding to a non-local IP address (in most | |
556 | * cases), we only allow binding to the local CID. | |
557 | */ | |
558 | cid = transport->get_local_cid(); | |
559 | if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) | |
560 | return -EADDRNOTAVAIL; | |
561 | ||
562 | switch (sk->sk_socket->type) { | |
563 | case SOCK_STREAM: | |
564 | spin_lock_bh(&vsock_table_lock); | |
565 | retval = __vsock_bind_stream(vsk, addr); | |
566 | spin_unlock_bh(&vsock_table_lock); | |
567 | break; | |
568 | ||
569 | case SOCK_DGRAM: | |
570 | retval = __vsock_bind_dgram(vsk, addr); | |
571 | break; | |
572 | ||
573 | default: | |
574 | retval = -EINVAL; | |
575 | break; | |
576 | } | |
577 | ||
578 | return retval; | |
579 | } | |
580 | ||
581 | struct sock *__vsock_create(struct net *net, | |
582 | struct socket *sock, | |
583 | struct sock *parent, | |
584 | gfp_t priority, | |
585 | unsigned short type) | |
586 | { | |
587 | struct sock *sk; | |
588 | struct vsock_sock *psk; | |
589 | struct vsock_sock *vsk; | |
590 | ||
591 | sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto); | |
592 | if (!sk) | |
593 | return NULL; | |
594 | ||
595 | sock_init_data(sock, sk); | |
596 | ||
597 | /* sk->sk_type is normally set in sock_init_data, but only if sock is | |
598 | * non-NULL. We make sure that our sockets always have a type by | |
599 | * setting it here if needed. | |
600 | */ | |
601 | if (!sock) | |
602 | sk->sk_type = type; | |
603 | ||
604 | vsk = vsock_sk(sk); | |
605 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
606 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
607 | ||
608 | sk->sk_destruct = vsock_sk_destruct; | |
609 | sk->sk_backlog_rcv = vsock_queue_rcv_skb; | |
610 | sk->sk_state = 0; | |
611 | sock_reset_flag(sk, SOCK_DONE); | |
612 | ||
613 | INIT_LIST_HEAD(&vsk->bound_table); | |
614 | INIT_LIST_HEAD(&vsk->connected_table); | |
615 | vsk->listener = NULL; | |
616 | INIT_LIST_HEAD(&vsk->pending_links); | |
617 | INIT_LIST_HEAD(&vsk->accept_queue); | |
618 | vsk->rejected = false; | |
619 | vsk->sent_request = false; | |
620 | vsk->ignore_connecting_rst = false; | |
621 | vsk->peer_shutdown = 0; | |
622 | ||
623 | psk = parent ? vsock_sk(parent) : NULL; | |
624 | if (parent) { | |
625 | vsk->trusted = psk->trusted; | |
626 | vsk->owner = get_cred(psk->owner); | |
627 | vsk->connect_timeout = psk->connect_timeout; | |
628 | } else { | |
629 | vsk->trusted = capable(CAP_NET_ADMIN); | |
630 | vsk->owner = get_current_cred(); | |
631 | vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
632 | } | |
633 | ||
634 | if (transport->init(vsk, psk) < 0) { | |
635 | sk_free(sk); | |
636 | return NULL; | |
637 | } | |
638 | ||
639 | if (sock) | |
640 | vsock_insert_unbound(vsk); | |
641 | ||
642 | return sk; | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(__vsock_create); | |
645 | ||
646 | static void __vsock_release(struct sock *sk) | |
647 | { | |
648 | if (sk) { | |
649 | struct sk_buff *skb; | |
650 | struct sock *pending; | |
651 | struct vsock_sock *vsk; | |
652 | ||
653 | vsk = vsock_sk(sk); | |
654 | pending = NULL; /* Compiler warning. */ | |
655 | ||
656 | if (vsock_in_bound_table(vsk)) | |
657 | vsock_remove_bound(vsk); | |
658 | ||
659 | if (vsock_in_connected_table(vsk)) | |
660 | vsock_remove_connected(vsk); | |
661 | ||
662 | transport->release(vsk); | |
663 | ||
664 | lock_sock(sk); | |
665 | sock_orphan(sk); | |
666 | sk->sk_shutdown = SHUTDOWN_MASK; | |
667 | ||
668 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) | |
669 | kfree_skb(skb); | |
670 | ||
671 | /* Clean up any sockets that never were accepted. */ | |
672 | while ((pending = vsock_dequeue_accept(sk)) != NULL) { | |
673 | __vsock_release(pending); | |
674 | sock_put(pending); | |
675 | } | |
676 | ||
677 | release_sock(sk); | |
678 | sock_put(sk); | |
679 | } | |
680 | } | |
681 | ||
682 | static void vsock_sk_destruct(struct sock *sk) | |
683 | { | |
684 | struct vsock_sock *vsk = vsock_sk(sk); | |
685 | ||
686 | transport->destruct(vsk); | |
687 | ||
688 | /* When clearing these addresses, there's no need to set the family and | |
689 | * possibly register the address family with the kernel. | |
690 | */ | |
691 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
692 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
693 | ||
694 | put_cred(vsk->owner); | |
695 | } | |
696 | ||
697 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
698 | { | |
699 | int err; | |
700 | ||
701 | err = sock_queue_rcv_skb(sk, skb); | |
702 | if (err) | |
703 | kfree_skb(skb); | |
704 | ||
705 | return err; | |
706 | } | |
707 | ||
708 | s64 vsock_stream_has_data(struct vsock_sock *vsk) | |
709 | { | |
710 | return transport->stream_has_data(vsk); | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(vsock_stream_has_data); | |
713 | ||
714 | s64 vsock_stream_has_space(struct vsock_sock *vsk) | |
715 | { | |
716 | return transport->stream_has_space(vsk); | |
717 | } | |
718 | EXPORT_SYMBOL_GPL(vsock_stream_has_space); | |
719 | ||
720 | static int vsock_release(struct socket *sock) | |
721 | { | |
722 | __vsock_release(sock->sk); | |
723 | sock->sk = NULL; | |
724 | sock->state = SS_FREE; | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | static int | |
730 | vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
731 | { | |
732 | int err; | |
733 | struct sock *sk; | |
734 | struct sockaddr_vm *vm_addr; | |
735 | ||
736 | sk = sock->sk; | |
737 | ||
738 | if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) | |
739 | return -EINVAL; | |
740 | ||
741 | lock_sock(sk); | |
742 | err = __vsock_bind(sk, vm_addr); | |
743 | release_sock(sk); | |
744 | ||
745 | return err; | |
746 | } | |
747 | ||
748 | static int vsock_getname(struct socket *sock, | |
749 | struct sockaddr *addr, int *addr_len, int peer) | |
750 | { | |
751 | int err; | |
752 | struct sock *sk; | |
753 | struct vsock_sock *vsk; | |
754 | struct sockaddr_vm *vm_addr; | |
755 | ||
756 | sk = sock->sk; | |
757 | vsk = vsock_sk(sk); | |
758 | err = 0; | |
759 | ||
760 | lock_sock(sk); | |
761 | ||
762 | if (peer) { | |
763 | if (sock->state != SS_CONNECTED) { | |
764 | err = -ENOTCONN; | |
765 | goto out; | |
766 | } | |
767 | vm_addr = &vsk->remote_addr; | |
768 | } else { | |
769 | vm_addr = &vsk->local_addr; | |
770 | } | |
771 | ||
772 | if (!vm_addr) { | |
773 | err = -EINVAL; | |
774 | goto out; | |
775 | } | |
776 | ||
777 | /* sys_getsockname() and sys_getpeername() pass us a | |
778 | * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately | |
779 | * that macro is defined in socket.c instead of .h, so we hardcode its | |
780 | * value here. | |
781 | */ | |
782 | BUILD_BUG_ON(sizeof(*vm_addr) > 128); | |
783 | memcpy(addr, vm_addr, sizeof(*vm_addr)); | |
784 | *addr_len = sizeof(*vm_addr); | |
785 | ||
786 | out: | |
787 | release_sock(sk); | |
788 | return err; | |
789 | } | |
790 | ||
791 | static int vsock_shutdown(struct socket *sock, int mode) | |
792 | { | |
793 | int err; | |
794 | struct sock *sk; | |
795 | ||
796 | /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses | |
797 | * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode | |
798 | * here like the other address families do. Note also that the | |
799 | * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), | |
800 | * which is what we want. | |
801 | */ | |
802 | mode++; | |
803 | ||
804 | if ((mode & ~SHUTDOWN_MASK) || !mode) | |
805 | return -EINVAL; | |
806 | ||
807 | /* If this is a STREAM socket and it is not connected then bail out | |
808 | * immediately. If it is a DGRAM socket then we must first kick the | |
809 | * socket so that it wakes up from any sleeping calls, for example | |
810 | * recv(), and then afterwards return the error. | |
811 | */ | |
812 | ||
813 | sk = sock->sk; | |
814 | if (sock->state == SS_UNCONNECTED) { | |
815 | err = -ENOTCONN; | |
816 | if (sk->sk_type == SOCK_STREAM) | |
817 | return err; | |
818 | } else { | |
819 | sock->state = SS_DISCONNECTING; | |
820 | err = 0; | |
821 | } | |
822 | ||
823 | /* Receive and send shutdowns are treated alike. */ | |
824 | mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); | |
825 | if (mode) { | |
826 | lock_sock(sk); | |
827 | sk->sk_shutdown |= mode; | |
828 | sk->sk_state_change(sk); | |
829 | release_sock(sk); | |
830 | ||
831 | if (sk->sk_type == SOCK_STREAM) { | |
832 | sock_reset_flag(sk, SOCK_DONE); | |
833 | vsock_send_shutdown(sk, mode); | |
834 | } | |
835 | } | |
836 | ||
837 | return err; | |
838 | } | |
839 | ||
840 | static unsigned int vsock_poll(struct file *file, struct socket *sock, | |
841 | poll_table *wait) | |
842 | { | |
843 | struct sock *sk; | |
844 | unsigned int mask; | |
845 | struct vsock_sock *vsk; | |
846 | ||
847 | sk = sock->sk; | |
848 | vsk = vsock_sk(sk); | |
849 | ||
850 | poll_wait(file, sk_sleep(sk), wait); | |
851 | mask = 0; | |
852 | ||
853 | if (sk->sk_err) | |
854 | /* Signify that there has been an error on this socket. */ | |
855 | mask |= POLLERR; | |
856 | ||
857 | /* INET sockets treat local write shutdown and peer write shutdown as a | |
858 | * case of POLLHUP set. | |
859 | */ | |
860 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || | |
861 | ((sk->sk_shutdown & SEND_SHUTDOWN) && | |
862 | (vsk->peer_shutdown & SEND_SHUTDOWN))) { | |
863 | mask |= POLLHUP; | |
864 | } | |
865 | ||
866 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
867 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
868 | mask |= POLLRDHUP; | |
869 | } | |
870 | ||
871 | if (sock->type == SOCK_DGRAM) { | |
872 | /* For datagram sockets we can read if there is something in | |
873 | * the queue and write as long as the socket isn't shutdown for | |
874 | * sending. | |
875 | */ | |
876 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
877 | (sk->sk_shutdown & RCV_SHUTDOWN)) { | |
878 | mask |= POLLIN | POLLRDNORM; | |
879 | } | |
880 | ||
881 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
882 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
883 | ||
884 | } else if (sock->type == SOCK_STREAM) { | |
885 | lock_sock(sk); | |
886 | ||
887 | /* Listening sockets that have connections in their accept | |
888 | * queue can be read. | |
889 | */ | |
890 | if (sk->sk_state == SS_LISTEN | |
891 | && !vsock_is_accept_queue_empty(sk)) | |
892 | mask |= POLLIN | POLLRDNORM; | |
893 | ||
894 | /* If there is something in the queue then we can read. */ | |
895 | if (transport->stream_is_active(vsk) && | |
896 | !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
897 | bool data_ready_now = false; | |
898 | int ret = transport->notify_poll_in( | |
899 | vsk, 1, &data_ready_now); | |
900 | if (ret < 0) { | |
901 | mask |= POLLERR; | |
902 | } else { | |
903 | if (data_ready_now) | |
904 | mask |= POLLIN | POLLRDNORM; | |
905 | ||
906 | } | |
907 | } | |
908 | ||
909 | /* Sockets whose connections have been closed, reset, or | |
910 | * terminated should also be considered read, and we check the | |
911 | * shutdown flag for that. | |
912 | */ | |
913 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
914 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
915 | mask |= POLLIN | POLLRDNORM; | |
916 | } | |
917 | ||
918 | /* Connected sockets that can produce data can be written. */ | |
919 | if (sk->sk_state == SS_CONNECTED) { | |
920 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
921 | bool space_avail_now = false; | |
922 | int ret = transport->notify_poll_out( | |
923 | vsk, 1, &space_avail_now); | |
924 | if (ret < 0) { | |
925 | mask |= POLLERR; | |
926 | } else { | |
927 | if (space_avail_now) | |
928 | /* Remove POLLWRBAND since INET | |
929 | * sockets are not setting it. | |
930 | */ | |
931 | mask |= POLLOUT | POLLWRNORM; | |
932 | ||
933 | } | |
934 | } | |
935 | } | |
936 | ||
937 | /* Simulate INET socket poll behaviors, which sets | |
938 | * POLLOUT|POLLWRNORM when peer is closed and nothing to read, | |
939 | * but local send is not shutdown. | |
940 | */ | |
941 | if (sk->sk_state == SS_UNCONNECTED) { | |
942 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
943 | mask |= POLLOUT | POLLWRNORM; | |
944 | ||
945 | } | |
946 | ||
947 | release_sock(sk); | |
948 | } | |
949 | ||
950 | return mask; | |
951 | } | |
952 | ||
953 | static int vsock_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
954 | struct msghdr *msg, size_t len) | |
955 | { | |
956 | int err; | |
957 | struct sock *sk; | |
958 | struct vsock_sock *vsk; | |
959 | struct sockaddr_vm *remote_addr; | |
960 | ||
961 | if (msg->msg_flags & MSG_OOB) | |
962 | return -EOPNOTSUPP; | |
963 | ||
964 | /* For now, MSG_DONTWAIT is always assumed... */ | |
965 | err = 0; | |
966 | sk = sock->sk; | |
967 | vsk = vsock_sk(sk); | |
968 | ||
969 | lock_sock(sk); | |
970 | ||
b3a6dfe8 AH |
971 | err = vsock_auto_bind(vsk); |
972 | if (err) | |
973 | goto out; | |
d021c344 | 974 | |
d021c344 AK |
975 | |
976 | /* If the provided message contains an address, use that. Otherwise | |
977 | * fall back on the socket's remote handle (if it has been connected). | |
978 | */ | |
979 | if (msg->msg_name && | |
980 | vsock_addr_cast(msg->msg_name, msg->msg_namelen, | |
981 | &remote_addr) == 0) { | |
982 | /* Ensure this address is of the right type and is a valid | |
983 | * destination. | |
984 | */ | |
985 | ||
986 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
987 | remote_addr->svm_cid = transport->get_local_cid(); | |
988 | ||
989 | if (!vsock_addr_bound(remote_addr)) { | |
990 | err = -EINVAL; | |
991 | goto out; | |
992 | } | |
993 | } else if (sock->state == SS_CONNECTED) { | |
994 | remote_addr = &vsk->remote_addr; | |
995 | ||
996 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
997 | remote_addr->svm_cid = transport->get_local_cid(); | |
998 | ||
999 | /* XXX Should connect() or this function ensure remote_addr is | |
1000 | * bound? | |
1001 | */ | |
1002 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1003 | err = -EINVAL; | |
1004 | goto out; | |
1005 | } | |
1006 | } else { | |
1007 | err = -EINVAL; | |
1008 | goto out; | |
1009 | } | |
1010 | ||
1011 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1012 | remote_addr->svm_port)) { | |
1013 | err = -EINVAL; | |
1014 | goto out; | |
1015 | } | |
1016 | ||
1017 | err = transport->dgram_enqueue(vsk, remote_addr, msg->msg_iov, len); | |
1018 | ||
1019 | out: | |
1020 | release_sock(sk); | |
1021 | return err; | |
1022 | } | |
1023 | ||
1024 | static int vsock_dgram_connect(struct socket *sock, | |
1025 | struct sockaddr *addr, int addr_len, int flags) | |
1026 | { | |
1027 | int err; | |
1028 | struct sock *sk; | |
1029 | struct vsock_sock *vsk; | |
1030 | struct sockaddr_vm *remote_addr; | |
1031 | ||
1032 | sk = sock->sk; | |
1033 | vsk = vsock_sk(sk); | |
1034 | ||
1035 | err = vsock_addr_cast(addr, addr_len, &remote_addr); | |
1036 | if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { | |
1037 | lock_sock(sk); | |
1038 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, | |
1039 | VMADDR_PORT_ANY); | |
1040 | sock->state = SS_UNCONNECTED; | |
1041 | release_sock(sk); | |
1042 | return 0; | |
1043 | } else if (err != 0) | |
1044 | return -EINVAL; | |
1045 | ||
1046 | lock_sock(sk); | |
1047 | ||
b3a6dfe8 AH |
1048 | err = vsock_auto_bind(vsk); |
1049 | if (err) | |
1050 | goto out; | |
d021c344 AK |
1051 | |
1052 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1053 | remote_addr->svm_port)) { | |
1054 | err = -EINVAL; | |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); | |
1059 | sock->state = SS_CONNECTED; | |
1060 | ||
1061 | out: | |
1062 | release_sock(sk); | |
1063 | return err; | |
1064 | } | |
1065 | ||
1066 | static int vsock_dgram_recvmsg(struct kiocb *kiocb, struct socket *sock, | |
1067 | struct msghdr *msg, size_t len, int flags) | |
1068 | { | |
1069 | return transport->dgram_dequeue(kiocb, vsock_sk(sock->sk), msg, len, | |
1070 | flags); | |
1071 | } | |
1072 | ||
1073 | static const struct proto_ops vsock_dgram_ops = { | |
1074 | .family = PF_VSOCK, | |
1075 | .owner = THIS_MODULE, | |
1076 | .release = vsock_release, | |
1077 | .bind = vsock_bind, | |
1078 | .connect = vsock_dgram_connect, | |
1079 | .socketpair = sock_no_socketpair, | |
1080 | .accept = sock_no_accept, | |
1081 | .getname = vsock_getname, | |
1082 | .poll = vsock_poll, | |
1083 | .ioctl = sock_no_ioctl, | |
1084 | .listen = sock_no_listen, | |
1085 | .shutdown = vsock_shutdown, | |
1086 | .setsockopt = sock_no_setsockopt, | |
1087 | .getsockopt = sock_no_getsockopt, | |
1088 | .sendmsg = vsock_dgram_sendmsg, | |
1089 | .recvmsg = vsock_dgram_recvmsg, | |
1090 | .mmap = sock_no_mmap, | |
1091 | .sendpage = sock_no_sendpage, | |
1092 | }; | |
1093 | ||
1094 | static void vsock_connect_timeout(struct work_struct *work) | |
1095 | { | |
1096 | struct sock *sk; | |
1097 | struct vsock_sock *vsk; | |
1098 | ||
1099 | vsk = container_of(work, struct vsock_sock, dwork.work); | |
1100 | sk = sk_vsock(vsk); | |
1101 | ||
1102 | lock_sock(sk); | |
1103 | if (sk->sk_state == SS_CONNECTING && | |
1104 | (sk->sk_shutdown != SHUTDOWN_MASK)) { | |
1105 | sk->sk_state = SS_UNCONNECTED; | |
1106 | sk->sk_err = ETIMEDOUT; | |
1107 | sk->sk_error_report(sk); | |
1108 | } | |
1109 | release_sock(sk); | |
1110 | ||
1111 | sock_put(sk); | |
1112 | } | |
1113 | ||
1114 | static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, | |
1115 | int addr_len, int flags) | |
1116 | { | |
1117 | int err; | |
1118 | struct sock *sk; | |
1119 | struct vsock_sock *vsk; | |
1120 | struct sockaddr_vm *remote_addr; | |
1121 | long timeout; | |
1122 | DEFINE_WAIT(wait); | |
1123 | ||
1124 | err = 0; | |
1125 | sk = sock->sk; | |
1126 | vsk = vsock_sk(sk); | |
1127 | ||
1128 | lock_sock(sk); | |
1129 | ||
1130 | /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ | |
1131 | switch (sock->state) { | |
1132 | case SS_CONNECTED: | |
1133 | err = -EISCONN; | |
1134 | goto out; | |
1135 | case SS_DISCONNECTING: | |
1136 | err = -EINVAL; | |
1137 | goto out; | |
1138 | case SS_CONNECTING: | |
1139 | /* This continues on so we can move sock into the SS_CONNECTED | |
1140 | * state once the connection has completed (at which point err | |
1141 | * will be set to zero also). Otherwise, we will either wait | |
1142 | * for the connection or return -EALREADY should this be a | |
1143 | * non-blocking call. | |
1144 | */ | |
1145 | err = -EALREADY; | |
1146 | break; | |
1147 | default: | |
1148 | if ((sk->sk_state == SS_LISTEN) || | |
1149 | vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { | |
1150 | err = -EINVAL; | |
1151 | goto out; | |
1152 | } | |
1153 | ||
1154 | /* The hypervisor and well-known contexts do not have socket | |
1155 | * endpoints. | |
1156 | */ | |
1157 | if (!transport->stream_allow(remote_addr->svm_cid, | |
1158 | remote_addr->svm_port)) { | |
1159 | err = -ENETUNREACH; | |
1160 | goto out; | |
1161 | } | |
1162 | ||
1163 | /* Set the remote address that we are connecting to. */ | |
1164 | memcpy(&vsk->remote_addr, remote_addr, | |
1165 | sizeof(vsk->remote_addr)); | |
1166 | ||
b3a6dfe8 AH |
1167 | err = vsock_auto_bind(vsk); |
1168 | if (err) | |
1169 | goto out; | |
d021c344 AK |
1170 | |
1171 | sk->sk_state = SS_CONNECTING; | |
1172 | ||
1173 | err = transport->connect(vsk); | |
1174 | if (err < 0) | |
1175 | goto out; | |
1176 | ||
1177 | /* Mark sock as connecting and set the error code to in | |
1178 | * progress in case this is a non-blocking connect. | |
1179 | */ | |
1180 | sock->state = SS_CONNECTING; | |
1181 | err = -EINPROGRESS; | |
1182 | } | |
1183 | ||
1184 | /* The receive path will handle all communication until we are able to | |
1185 | * enter the connected state. Here we wait for the connection to be | |
1186 | * completed or a notification of an error. | |
1187 | */ | |
1188 | timeout = vsk->connect_timeout; | |
1189 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1190 | ||
1191 | while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) { | |
1192 | if (flags & O_NONBLOCK) { | |
1193 | /* If we're not going to block, we schedule a timeout | |
1194 | * function to generate a timeout on the connection | |
1195 | * attempt, in case the peer doesn't respond in a | |
1196 | * timely manner. We hold on to the socket until the | |
1197 | * timeout fires. | |
1198 | */ | |
1199 | sock_hold(sk); | |
1200 | INIT_DELAYED_WORK(&vsk->dwork, | |
1201 | vsock_connect_timeout); | |
1202 | schedule_delayed_work(&vsk->dwork, timeout); | |
1203 | ||
1204 | /* Skip ahead to preserve error code set above. */ | |
1205 | goto out_wait; | |
1206 | } | |
1207 | ||
1208 | release_sock(sk); | |
1209 | timeout = schedule_timeout(timeout); | |
1210 | lock_sock(sk); | |
1211 | ||
1212 | if (signal_pending(current)) { | |
1213 | err = sock_intr_errno(timeout); | |
1214 | goto out_wait_error; | |
1215 | } else if (timeout == 0) { | |
1216 | err = -ETIMEDOUT; | |
1217 | goto out_wait_error; | |
1218 | } | |
1219 | ||
1220 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1221 | } | |
1222 | ||
1223 | if (sk->sk_err) { | |
1224 | err = -sk->sk_err; | |
1225 | goto out_wait_error; | |
1226 | } else | |
1227 | err = 0; | |
1228 | ||
1229 | out_wait: | |
1230 | finish_wait(sk_sleep(sk), &wait); | |
1231 | out: | |
1232 | release_sock(sk); | |
1233 | return err; | |
1234 | ||
1235 | out_wait_error: | |
1236 | sk->sk_state = SS_UNCONNECTED; | |
1237 | sock->state = SS_UNCONNECTED; | |
1238 | goto out_wait; | |
1239 | } | |
1240 | ||
1241 | static int vsock_accept(struct socket *sock, struct socket *newsock, int flags) | |
1242 | { | |
1243 | struct sock *listener; | |
1244 | int err; | |
1245 | struct sock *connected; | |
1246 | struct vsock_sock *vconnected; | |
1247 | long timeout; | |
1248 | DEFINE_WAIT(wait); | |
1249 | ||
1250 | err = 0; | |
1251 | listener = sock->sk; | |
1252 | ||
1253 | lock_sock(listener); | |
1254 | ||
1255 | if (sock->type != SOCK_STREAM) { | |
1256 | err = -EOPNOTSUPP; | |
1257 | goto out; | |
1258 | } | |
1259 | ||
1260 | if (listener->sk_state != SS_LISTEN) { | |
1261 | err = -EINVAL; | |
1262 | goto out; | |
1263 | } | |
1264 | ||
1265 | /* Wait for children sockets to appear; these are the new sockets | |
1266 | * created upon connection establishment. | |
1267 | */ | |
1268 | timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); | |
1269 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1270 | ||
1271 | while ((connected = vsock_dequeue_accept(listener)) == NULL && | |
1272 | listener->sk_err == 0) { | |
1273 | release_sock(listener); | |
1274 | timeout = schedule_timeout(timeout); | |
1275 | lock_sock(listener); | |
1276 | ||
1277 | if (signal_pending(current)) { | |
1278 | err = sock_intr_errno(timeout); | |
1279 | goto out_wait; | |
1280 | } else if (timeout == 0) { | |
1281 | err = -EAGAIN; | |
1282 | goto out_wait; | |
1283 | } | |
1284 | ||
1285 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1286 | } | |
1287 | ||
1288 | if (listener->sk_err) | |
1289 | err = -listener->sk_err; | |
1290 | ||
1291 | if (connected) { | |
1292 | listener->sk_ack_backlog--; | |
1293 | ||
1294 | lock_sock(connected); | |
1295 | vconnected = vsock_sk(connected); | |
1296 | ||
1297 | /* If the listener socket has received an error, then we should | |
1298 | * reject this socket and return. Note that we simply mark the | |
1299 | * socket rejected, drop our reference, and let the cleanup | |
1300 | * function handle the cleanup; the fact that we found it in | |
1301 | * the listener's accept queue guarantees that the cleanup | |
1302 | * function hasn't run yet. | |
1303 | */ | |
1304 | if (err) { | |
1305 | vconnected->rejected = true; | |
1306 | release_sock(connected); | |
1307 | sock_put(connected); | |
1308 | goto out_wait; | |
1309 | } | |
1310 | ||
1311 | newsock->state = SS_CONNECTED; | |
1312 | sock_graft(connected, newsock); | |
1313 | release_sock(connected); | |
1314 | sock_put(connected); | |
1315 | } | |
1316 | ||
1317 | out_wait: | |
1318 | finish_wait(sk_sleep(listener), &wait); | |
1319 | out: | |
1320 | release_sock(listener); | |
1321 | return err; | |
1322 | } | |
1323 | ||
1324 | static int vsock_listen(struct socket *sock, int backlog) | |
1325 | { | |
1326 | int err; | |
1327 | struct sock *sk; | |
1328 | struct vsock_sock *vsk; | |
1329 | ||
1330 | sk = sock->sk; | |
1331 | ||
1332 | lock_sock(sk); | |
1333 | ||
1334 | if (sock->type != SOCK_STREAM) { | |
1335 | err = -EOPNOTSUPP; | |
1336 | goto out; | |
1337 | } | |
1338 | ||
1339 | if (sock->state != SS_UNCONNECTED) { | |
1340 | err = -EINVAL; | |
1341 | goto out; | |
1342 | } | |
1343 | ||
1344 | vsk = vsock_sk(sk); | |
1345 | ||
1346 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1347 | err = -EINVAL; | |
1348 | goto out; | |
1349 | } | |
1350 | ||
1351 | sk->sk_max_ack_backlog = backlog; | |
1352 | sk->sk_state = SS_LISTEN; | |
1353 | ||
1354 | err = 0; | |
1355 | ||
1356 | out: | |
1357 | release_sock(sk); | |
1358 | return err; | |
1359 | } | |
1360 | ||
1361 | static int vsock_stream_setsockopt(struct socket *sock, | |
1362 | int level, | |
1363 | int optname, | |
1364 | char __user *optval, | |
1365 | unsigned int optlen) | |
1366 | { | |
1367 | int err; | |
1368 | struct sock *sk; | |
1369 | struct vsock_sock *vsk; | |
1370 | u64 val; | |
1371 | ||
1372 | if (level != AF_VSOCK) | |
1373 | return -ENOPROTOOPT; | |
1374 | ||
1375 | #define COPY_IN(_v) \ | |
1376 | do { \ | |
1377 | if (optlen < sizeof(_v)) { \ | |
1378 | err = -EINVAL; \ | |
1379 | goto exit; \ | |
1380 | } \ | |
1381 | if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ | |
1382 | err = -EFAULT; \ | |
1383 | goto exit; \ | |
1384 | } \ | |
1385 | } while (0) | |
1386 | ||
1387 | err = 0; | |
1388 | sk = sock->sk; | |
1389 | vsk = vsock_sk(sk); | |
1390 | ||
1391 | lock_sock(sk); | |
1392 | ||
1393 | switch (optname) { | |
1394 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1395 | COPY_IN(val); | |
1396 | transport->set_buffer_size(vsk, val); | |
1397 | break; | |
1398 | ||
1399 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1400 | COPY_IN(val); | |
1401 | transport->set_max_buffer_size(vsk, val); | |
1402 | break; | |
1403 | ||
1404 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1405 | COPY_IN(val); | |
1406 | transport->set_min_buffer_size(vsk, val); | |
1407 | break; | |
1408 | ||
1409 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
1410 | struct timeval tv; | |
1411 | COPY_IN(tv); | |
1412 | if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && | |
1413 | tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { | |
1414 | vsk->connect_timeout = tv.tv_sec * HZ + | |
1415 | DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); | |
1416 | if (vsk->connect_timeout == 0) | |
1417 | vsk->connect_timeout = | |
1418 | VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
1419 | ||
1420 | } else { | |
1421 | err = -ERANGE; | |
1422 | } | |
1423 | break; | |
1424 | } | |
1425 | ||
1426 | default: | |
1427 | err = -ENOPROTOOPT; | |
1428 | break; | |
1429 | } | |
1430 | ||
1431 | #undef COPY_IN | |
1432 | ||
1433 | exit: | |
1434 | release_sock(sk); | |
1435 | return err; | |
1436 | } | |
1437 | ||
1438 | static int vsock_stream_getsockopt(struct socket *sock, | |
1439 | int level, int optname, | |
1440 | char __user *optval, | |
1441 | int __user *optlen) | |
1442 | { | |
1443 | int err; | |
1444 | int len; | |
1445 | struct sock *sk; | |
1446 | struct vsock_sock *vsk; | |
1447 | u64 val; | |
1448 | ||
1449 | if (level != AF_VSOCK) | |
1450 | return -ENOPROTOOPT; | |
1451 | ||
1452 | err = get_user(len, optlen); | |
1453 | if (err != 0) | |
1454 | return err; | |
1455 | ||
1456 | #define COPY_OUT(_v) \ | |
1457 | do { \ | |
1458 | if (len < sizeof(_v)) \ | |
1459 | return -EINVAL; \ | |
1460 | \ | |
1461 | len = sizeof(_v); \ | |
1462 | if (copy_to_user(optval, &_v, len) != 0) \ | |
1463 | return -EFAULT; \ | |
1464 | \ | |
1465 | } while (0) | |
1466 | ||
1467 | err = 0; | |
1468 | sk = sock->sk; | |
1469 | vsk = vsock_sk(sk); | |
1470 | ||
1471 | switch (optname) { | |
1472 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1473 | val = transport->get_buffer_size(vsk); | |
1474 | COPY_OUT(val); | |
1475 | break; | |
1476 | ||
1477 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1478 | val = transport->get_max_buffer_size(vsk); | |
1479 | COPY_OUT(val); | |
1480 | break; | |
1481 | ||
1482 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1483 | val = transport->get_min_buffer_size(vsk); | |
1484 | COPY_OUT(val); | |
1485 | break; | |
1486 | ||
1487 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
1488 | struct timeval tv; | |
1489 | tv.tv_sec = vsk->connect_timeout / HZ; | |
1490 | tv.tv_usec = | |
1491 | (vsk->connect_timeout - | |
1492 | tv.tv_sec * HZ) * (1000000 / HZ); | |
1493 | COPY_OUT(tv); | |
1494 | break; | |
1495 | } | |
1496 | default: | |
1497 | return -ENOPROTOOPT; | |
1498 | } | |
1499 | ||
1500 | err = put_user(len, optlen); | |
1501 | if (err != 0) | |
1502 | return -EFAULT; | |
1503 | ||
1504 | #undef COPY_OUT | |
1505 | ||
1506 | return 0; | |
1507 | } | |
1508 | ||
1509 | static int vsock_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1510 | struct msghdr *msg, size_t len) | |
1511 | { | |
1512 | struct sock *sk; | |
1513 | struct vsock_sock *vsk; | |
1514 | ssize_t total_written; | |
1515 | long timeout; | |
1516 | int err; | |
1517 | struct vsock_transport_send_notify_data send_data; | |
1518 | ||
1519 | DEFINE_WAIT(wait); | |
1520 | ||
1521 | sk = sock->sk; | |
1522 | vsk = vsock_sk(sk); | |
1523 | total_written = 0; | |
1524 | err = 0; | |
1525 | ||
1526 | if (msg->msg_flags & MSG_OOB) | |
1527 | return -EOPNOTSUPP; | |
1528 | ||
1529 | lock_sock(sk); | |
1530 | ||
1531 | /* Callers should not provide a destination with stream sockets. */ | |
1532 | if (msg->msg_namelen) { | |
1533 | err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP; | |
1534 | goto out; | |
1535 | } | |
1536 | ||
1537 | /* Send data only if both sides are not shutdown in the direction. */ | |
1538 | if (sk->sk_shutdown & SEND_SHUTDOWN || | |
1539 | vsk->peer_shutdown & RCV_SHUTDOWN) { | |
1540 | err = -EPIPE; | |
1541 | goto out; | |
1542 | } | |
1543 | ||
1544 | if (sk->sk_state != SS_CONNECTED || | |
1545 | !vsock_addr_bound(&vsk->local_addr)) { | |
1546 | err = -ENOTCONN; | |
1547 | goto out; | |
1548 | } | |
1549 | ||
1550 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1551 | err = -EDESTADDRREQ; | |
1552 | goto out; | |
1553 | } | |
1554 | ||
1555 | /* Wait for room in the produce queue to enqueue our user's data. */ | |
1556 | timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1557 | ||
1558 | err = transport->notify_send_init(vsk, &send_data); | |
1559 | if (err < 0) | |
1560 | goto out; | |
1561 | ||
1562 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1563 | ||
1564 | while (total_written < len) { | |
1565 | ssize_t written; | |
1566 | ||
1567 | while (vsock_stream_has_space(vsk) == 0 && | |
1568 | sk->sk_err == 0 && | |
1569 | !(sk->sk_shutdown & SEND_SHUTDOWN) && | |
1570 | !(vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1571 | ||
1572 | /* Don't wait for non-blocking sockets. */ | |
1573 | if (timeout == 0) { | |
1574 | err = -EAGAIN; | |
1575 | goto out_wait; | |
1576 | } | |
1577 | ||
1578 | err = transport->notify_send_pre_block(vsk, &send_data); | |
1579 | if (err < 0) | |
1580 | goto out_wait; | |
1581 | ||
1582 | release_sock(sk); | |
1583 | timeout = schedule_timeout(timeout); | |
1584 | lock_sock(sk); | |
1585 | if (signal_pending(current)) { | |
1586 | err = sock_intr_errno(timeout); | |
1587 | goto out_wait; | |
1588 | } else if (timeout == 0) { | |
1589 | err = -EAGAIN; | |
1590 | goto out_wait; | |
1591 | } | |
1592 | ||
1593 | prepare_to_wait(sk_sleep(sk), &wait, | |
1594 | TASK_INTERRUPTIBLE); | |
1595 | } | |
1596 | ||
1597 | /* These checks occur both as part of and after the loop | |
1598 | * conditional since we need to check before and after | |
1599 | * sleeping. | |
1600 | */ | |
1601 | if (sk->sk_err) { | |
1602 | err = -sk->sk_err; | |
1603 | goto out_wait; | |
1604 | } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || | |
1605 | (vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1606 | err = -EPIPE; | |
1607 | goto out_wait; | |
1608 | } | |
1609 | ||
1610 | err = transport->notify_send_pre_enqueue(vsk, &send_data); | |
1611 | if (err < 0) | |
1612 | goto out_wait; | |
1613 | ||
1614 | /* Note that enqueue will only write as many bytes as are free | |
1615 | * in the produce queue, so we don't need to ensure len is | |
1616 | * smaller than the queue size. It is the caller's | |
1617 | * responsibility to check how many bytes we were able to send. | |
1618 | */ | |
1619 | ||
1620 | written = transport->stream_enqueue( | |
1621 | vsk, msg->msg_iov, | |
1622 | len - total_written); | |
1623 | if (written < 0) { | |
1624 | err = -ENOMEM; | |
1625 | goto out_wait; | |
1626 | } | |
1627 | ||
1628 | total_written += written; | |
1629 | ||
1630 | err = transport->notify_send_post_enqueue( | |
1631 | vsk, written, &send_data); | |
1632 | if (err < 0) | |
1633 | goto out_wait; | |
1634 | ||
1635 | } | |
1636 | ||
1637 | out_wait: | |
1638 | if (total_written > 0) | |
1639 | err = total_written; | |
1640 | finish_wait(sk_sleep(sk), &wait); | |
1641 | out: | |
1642 | release_sock(sk); | |
1643 | return err; | |
1644 | } | |
1645 | ||
1646 | ||
1647 | static int | |
1648 | vsock_stream_recvmsg(struct kiocb *kiocb, | |
1649 | struct socket *sock, | |
1650 | struct msghdr *msg, size_t len, int flags) | |
1651 | { | |
1652 | struct sock *sk; | |
1653 | struct vsock_sock *vsk; | |
1654 | int err; | |
1655 | size_t target; | |
1656 | ssize_t copied; | |
1657 | long timeout; | |
1658 | struct vsock_transport_recv_notify_data recv_data; | |
1659 | ||
1660 | DEFINE_WAIT(wait); | |
1661 | ||
1662 | sk = sock->sk; | |
1663 | vsk = vsock_sk(sk); | |
1664 | err = 0; | |
1665 | ||
d5e0d0f6 MK |
1666 | msg->msg_namelen = 0; |
1667 | ||
d021c344 AK |
1668 | lock_sock(sk); |
1669 | ||
1670 | if (sk->sk_state != SS_CONNECTED) { | |
1671 | /* Recvmsg is supposed to return 0 if a peer performs an | |
1672 | * orderly shutdown. Differentiate between that case and when a | |
1673 | * peer has not connected or a local shutdown occured with the | |
1674 | * SOCK_DONE flag. | |
1675 | */ | |
1676 | if (sock_flag(sk, SOCK_DONE)) | |
1677 | err = 0; | |
1678 | else | |
1679 | err = -ENOTCONN; | |
1680 | ||
1681 | goto out; | |
1682 | } | |
1683 | ||
1684 | if (flags & MSG_OOB) { | |
1685 | err = -EOPNOTSUPP; | |
1686 | goto out; | |
1687 | } | |
1688 | ||
1689 | /* We don't check peer_shutdown flag here since peer may actually shut | |
1690 | * down, but there can be data in the queue that a local socket can | |
1691 | * receive. | |
1692 | */ | |
1693 | if (sk->sk_shutdown & RCV_SHUTDOWN) { | |
1694 | err = 0; | |
1695 | goto out; | |
1696 | } | |
1697 | ||
1698 | /* It is valid on Linux to pass in a zero-length receive buffer. This | |
1699 | * is not an error. We may as well bail out now. | |
1700 | */ | |
1701 | if (!len) { | |
1702 | err = 0; | |
1703 | goto out; | |
1704 | } | |
1705 | ||
1706 | /* We must not copy less than target bytes into the user's buffer | |
1707 | * before returning successfully, so we wait for the consume queue to | |
1708 | * have that much data to consume before dequeueing. Note that this | |
1709 | * makes it impossible to handle cases where target is greater than the | |
1710 | * queue size. | |
1711 | */ | |
1712 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1713 | if (target >= transport->stream_rcvhiwat(vsk)) { | |
1714 | err = -ENOMEM; | |
1715 | goto out; | |
1716 | } | |
1717 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1718 | copied = 0; | |
1719 | ||
1720 | err = transport->notify_recv_init(vsk, target, &recv_data); | |
1721 | if (err < 0) | |
1722 | goto out; | |
1723 | ||
1724 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1725 | ||
1726 | while (1) { | |
1727 | s64 ready = vsock_stream_has_data(vsk); | |
1728 | ||
1729 | if (ready < 0) { | |
1730 | /* Invalid queue pair content. XXX This should be | |
1731 | * changed to a connection reset in a later change. | |
1732 | */ | |
1733 | ||
1734 | err = -ENOMEM; | |
1735 | goto out_wait; | |
1736 | } else if (ready > 0) { | |
1737 | ssize_t read; | |
1738 | ||
1739 | err = transport->notify_recv_pre_dequeue( | |
1740 | vsk, target, &recv_data); | |
1741 | if (err < 0) | |
1742 | break; | |
1743 | ||
1744 | read = transport->stream_dequeue( | |
1745 | vsk, msg->msg_iov, | |
1746 | len - copied, flags); | |
1747 | if (read < 0) { | |
1748 | err = -ENOMEM; | |
1749 | break; | |
1750 | } | |
1751 | ||
1752 | copied += read; | |
1753 | ||
1754 | err = transport->notify_recv_post_dequeue( | |
1755 | vsk, target, read, | |
1756 | !(flags & MSG_PEEK), &recv_data); | |
1757 | if (err < 0) | |
1758 | goto out_wait; | |
1759 | ||
1760 | if (read >= target || flags & MSG_PEEK) | |
1761 | break; | |
1762 | ||
1763 | target -= read; | |
1764 | } else { | |
1765 | if (sk->sk_err != 0 || (sk->sk_shutdown & RCV_SHUTDOWN) | |
1766 | || (vsk->peer_shutdown & SEND_SHUTDOWN)) { | |
1767 | break; | |
1768 | } | |
1769 | /* Don't wait for non-blocking sockets. */ | |
1770 | if (timeout == 0) { | |
1771 | err = -EAGAIN; | |
1772 | break; | |
1773 | } | |
1774 | ||
1775 | err = transport->notify_recv_pre_block( | |
1776 | vsk, target, &recv_data); | |
1777 | if (err < 0) | |
1778 | break; | |
1779 | ||
1780 | release_sock(sk); | |
1781 | timeout = schedule_timeout(timeout); | |
1782 | lock_sock(sk); | |
1783 | ||
1784 | if (signal_pending(current)) { | |
1785 | err = sock_intr_errno(timeout); | |
1786 | break; | |
1787 | } else if (timeout == 0) { | |
1788 | err = -EAGAIN; | |
1789 | break; | |
1790 | } | |
1791 | ||
1792 | prepare_to_wait(sk_sleep(sk), &wait, | |
1793 | TASK_INTERRUPTIBLE); | |
1794 | } | |
1795 | } | |
1796 | ||
1797 | if (sk->sk_err) | |
1798 | err = -sk->sk_err; | |
1799 | else if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1800 | err = 0; | |
1801 | ||
1802 | if (copied > 0) { | |
1803 | /* We only do these additional bookkeeping/notification steps | |
1804 | * if we actually copied something out of the queue pair | |
1805 | * instead of just peeking ahead. | |
1806 | */ | |
1807 | ||
1808 | if (!(flags & MSG_PEEK)) { | |
1809 | /* If the other side has shutdown for sending and there | |
1810 | * is nothing more to read, then modify the socket | |
1811 | * state. | |
1812 | */ | |
1813 | if (vsk->peer_shutdown & SEND_SHUTDOWN) { | |
1814 | if (vsock_stream_has_data(vsk) <= 0) { | |
1815 | sk->sk_state = SS_UNCONNECTED; | |
1816 | sock_set_flag(sk, SOCK_DONE); | |
1817 | sk->sk_state_change(sk); | |
1818 | } | |
1819 | } | |
1820 | } | |
1821 | err = copied; | |
1822 | } | |
1823 | ||
1824 | out_wait: | |
1825 | finish_wait(sk_sleep(sk), &wait); | |
1826 | out: | |
1827 | release_sock(sk); | |
1828 | return err; | |
1829 | } | |
1830 | ||
1831 | static const struct proto_ops vsock_stream_ops = { | |
1832 | .family = PF_VSOCK, | |
1833 | .owner = THIS_MODULE, | |
1834 | .release = vsock_release, | |
1835 | .bind = vsock_bind, | |
1836 | .connect = vsock_stream_connect, | |
1837 | .socketpair = sock_no_socketpair, | |
1838 | .accept = vsock_accept, | |
1839 | .getname = vsock_getname, | |
1840 | .poll = vsock_poll, | |
1841 | .ioctl = sock_no_ioctl, | |
1842 | .listen = vsock_listen, | |
1843 | .shutdown = vsock_shutdown, | |
1844 | .setsockopt = vsock_stream_setsockopt, | |
1845 | .getsockopt = vsock_stream_getsockopt, | |
1846 | .sendmsg = vsock_stream_sendmsg, | |
1847 | .recvmsg = vsock_stream_recvmsg, | |
1848 | .mmap = sock_no_mmap, | |
1849 | .sendpage = sock_no_sendpage, | |
1850 | }; | |
1851 | ||
1852 | static int vsock_create(struct net *net, struct socket *sock, | |
1853 | int protocol, int kern) | |
1854 | { | |
1855 | if (!sock) | |
1856 | return -EINVAL; | |
1857 | ||
6cf1c5fc | 1858 | if (protocol && protocol != PF_VSOCK) |
d021c344 AK |
1859 | return -EPROTONOSUPPORT; |
1860 | ||
1861 | switch (sock->type) { | |
1862 | case SOCK_DGRAM: | |
1863 | sock->ops = &vsock_dgram_ops; | |
1864 | break; | |
1865 | case SOCK_STREAM: | |
1866 | sock->ops = &vsock_stream_ops; | |
1867 | break; | |
1868 | default: | |
1869 | return -ESOCKTNOSUPPORT; | |
1870 | } | |
1871 | ||
1872 | sock->state = SS_UNCONNECTED; | |
1873 | ||
1874 | return __vsock_create(net, sock, NULL, GFP_KERNEL, 0) ? 0 : -ENOMEM; | |
1875 | } | |
1876 | ||
1877 | static const struct net_proto_family vsock_family_ops = { | |
1878 | .family = AF_VSOCK, | |
1879 | .create = vsock_create, | |
1880 | .owner = THIS_MODULE, | |
1881 | }; | |
1882 | ||
1883 | static long vsock_dev_do_ioctl(struct file *filp, | |
1884 | unsigned int cmd, void __user *ptr) | |
1885 | { | |
1886 | u32 __user *p = ptr; | |
1887 | int retval = 0; | |
1888 | ||
1889 | switch (cmd) { | |
1890 | case IOCTL_VM_SOCKETS_GET_LOCAL_CID: | |
1891 | if (put_user(transport->get_local_cid(), p) != 0) | |
1892 | retval = -EFAULT; | |
1893 | break; | |
1894 | ||
1895 | default: | |
1896 | pr_err("Unknown ioctl %d\n", cmd); | |
1897 | retval = -EINVAL; | |
1898 | } | |
1899 | ||
1900 | return retval; | |
1901 | } | |
1902 | ||
1903 | static long vsock_dev_ioctl(struct file *filp, | |
1904 | unsigned int cmd, unsigned long arg) | |
1905 | { | |
1906 | return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); | |
1907 | } | |
1908 | ||
1909 | #ifdef CONFIG_COMPAT | |
1910 | static long vsock_dev_compat_ioctl(struct file *filp, | |
1911 | unsigned int cmd, unsigned long arg) | |
1912 | { | |
1913 | return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); | |
1914 | } | |
1915 | #endif | |
1916 | ||
1917 | static const struct file_operations vsock_device_ops = { | |
1918 | .owner = THIS_MODULE, | |
1919 | .unlocked_ioctl = vsock_dev_ioctl, | |
1920 | #ifdef CONFIG_COMPAT | |
1921 | .compat_ioctl = vsock_dev_compat_ioctl, | |
1922 | #endif | |
1923 | .open = nonseekable_open, | |
1924 | }; | |
1925 | ||
1926 | static struct miscdevice vsock_device = { | |
1927 | .name = "vsock", | |
d021c344 AK |
1928 | .fops = &vsock_device_ops, |
1929 | }; | |
1930 | ||
1931 | static int __vsock_core_init(void) | |
1932 | { | |
1933 | int err; | |
1934 | ||
1935 | vsock_init_tables(); | |
1936 | ||
6ad0b2f7 | 1937 | vsock_device.minor = MISC_DYNAMIC_MINOR; |
d021c344 AK |
1938 | err = misc_register(&vsock_device); |
1939 | if (err) { | |
1940 | pr_err("Failed to register misc device\n"); | |
1941 | return -ENOENT; | |
1942 | } | |
1943 | ||
1944 | err = proto_register(&vsock_proto, 1); /* we want our slab */ | |
1945 | if (err) { | |
1946 | pr_err("Cannot register vsock protocol\n"); | |
1947 | goto err_misc_deregister; | |
1948 | } | |
1949 | ||
1950 | err = sock_register(&vsock_family_ops); | |
1951 | if (err) { | |
1952 | pr_err("could not register af_vsock (%d) address family: %d\n", | |
1953 | AF_VSOCK, err); | |
1954 | goto err_unregister_proto; | |
1955 | } | |
1956 | ||
1957 | return 0; | |
1958 | ||
1959 | err_unregister_proto: | |
1960 | proto_unregister(&vsock_proto); | |
1961 | err_misc_deregister: | |
1962 | misc_deregister(&vsock_device); | |
1963 | return err; | |
1964 | } | |
1965 | ||
1966 | int vsock_core_init(const struct vsock_transport *t) | |
1967 | { | |
1968 | int retval = mutex_lock_interruptible(&vsock_register_mutex); | |
1969 | if (retval) | |
1970 | return retval; | |
1971 | ||
1972 | if (transport) { | |
1973 | retval = -EBUSY; | |
1974 | goto out; | |
1975 | } | |
1976 | ||
1977 | transport = t; | |
1978 | retval = __vsock_core_init(); | |
1979 | if (retval) | |
1980 | transport = NULL; | |
1981 | ||
1982 | out: | |
1983 | mutex_unlock(&vsock_register_mutex); | |
1984 | return retval; | |
1985 | } | |
1986 | EXPORT_SYMBOL_GPL(vsock_core_init); | |
1987 | ||
1988 | void vsock_core_exit(void) | |
1989 | { | |
1990 | mutex_lock(&vsock_register_mutex); | |
1991 | ||
1992 | misc_deregister(&vsock_device); | |
1993 | sock_unregister(AF_VSOCK); | |
1994 | proto_unregister(&vsock_proto); | |
1995 | ||
1996 | /* We do not want the assignment below re-ordered. */ | |
1997 | mb(); | |
1998 | transport = NULL; | |
1999 | ||
2000 | mutex_unlock(&vsock_register_mutex); | |
2001 | } | |
2002 | EXPORT_SYMBOL_GPL(vsock_core_exit); | |
2003 | ||
2004 | MODULE_AUTHOR("VMware, Inc."); | |
2005 | MODULE_DESCRIPTION("VMware Virtual Socket Family"); | |
7ccd7de6 | 2006 | MODULE_VERSION("1.0.0.0-k"); |
d021c344 | 2007 | MODULE_LICENSE("GPL v2"); |