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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 TCP_LISTEN state. When a | |
40 | * connection request is received (the second kind of socket mentioned above), | |
41 | * we create a new socket and refer to it as a pending socket. These pending | |
42 | * sockets are placed on the pending connection list of the listener socket. | |
43 | * When future packets are received for the address the listener socket is | |
44 | * bound to, we check if the source of the packet is from one that has an | |
45 | * existing pending connection. If it does, we process the packet for the | |
46 | * pending socket. When that socket reaches the connected state, it is removed | |
47 | * from the listener socket's pending list and enqueued in the listener | |
48 | * socket's accept queue. Callers of accept(2) will accept connected sockets | |
49 | * from the listener socket's accept queue. If the socket cannot be accepted | |
50 | * for some reason then it is marked rejected. Once the connection is | |
51 | * accepted, it is owned by the user process and the responsibility for cleanup | |
52 | * falls with that user process. | |
53 | * | |
54 | * - It is possible that these pending sockets will never reach the connected | |
55 | * state; in fact, we may never receive another packet after the connection | |
56 | * request. Because of this, we must schedule a cleanup function to run in the | |
57 | * future, after some amount of time passes where a connection should have been | |
58 | * established. This function ensures that the socket is off all lists so it | |
59 | * cannot be retrieved, then drops all references to the socket so it is cleaned | |
60 | * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this | |
61 | * function will also cleanup rejected sockets, those that reach the connected | |
62 | * state but leave it before they have been accepted. | |
63 | * | |
64 | * - Lock ordering for pending or accept queue sockets is: | |
65 | * | |
66 | * lock_sock(listener); | |
67 | * lock_sock_nested(pending, SINGLE_DEPTH_NESTING); | |
68 | * | |
69 | * Using explicit nested locking keeps lockdep happy since normally only one | |
70 | * lock of a given class may be taken at a time. | |
71 | * | |
72 | * - Sockets created by user action will be cleaned up when the user process | |
73 | * calls close(2), causing our release implementation to be called. Our release | |
74 | * implementation will perform some cleanup then drop the last reference so our | |
75 | * sk_destruct implementation is invoked. Our sk_destruct implementation will | |
76 | * perform additional cleanup that's common for both types of sockets. | |
77 | * | |
78 | * - A socket's reference count is what ensures that the structure won't be | |
79 | * freed. Each entry in a list (such as the "global" bound and connected tables | |
80 | * and the listener socket's pending list and connected queue) ensures a | |
81 | * reference. When we defer work until process context and pass a socket as our | |
82 | * argument, we must ensure the reference count is increased to ensure the | |
83 | * socket isn't freed before the function is run; the deferred function will | |
84 | * then drop the reference. | |
85 | * | |
86 | * - sk->sk_state uses the TCP state constants because they are widely used by | |
87 | * other address families and exposed to userspace tools like ss(8): | |
88 | * | |
89 | * TCP_CLOSE - unconnected | |
90 | * TCP_SYN_SENT - connecting | |
91 | * TCP_ESTABLISHED - connected | |
92 | * TCP_CLOSING - disconnecting | |
93 | * TCP_LISTEN - listening | |
94 | */ | |
95 | ||
96 | #include <linux/types.h> | |
97 | #include <linux/bitops.h> | |
98 | #include <linux/cred.h> | |
99 | #include <linux/init.h> | |
100 | #include <linux/io.h> | |
101 | #include <linux/kernel.h> | |
102 | #include <linux/sched/signal.h> | |
103 | #include <linux/kmod.h> | |
104 | #include <linux/list.h> | |
105 | #include <linux/miscdevice.h> | |
106 | #include <linux/module.h> | |
107 | #include <linux/mutex.h> | |
108 | #include <linux/net.h> | |
109 | #include <linux/poll.h> | |
110 | #include <linux/random.h> | |
111 | #include <linux/skbuff.h> | |
112 | #include <linux/smp.h> | |
113 | #include <linux/socket.h> | |
114 | #include <linux/stddef.h> | |
115 | #include <linux/unistd.h> | |
116 | #include <linux/wait.h> | |
117 | #include <linux/workqueue.h> | |
118 | #include <net/sock.h> | |
119 | #include <net/af_vsock.h> | |
120 | ||
121 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); | |
122 | static void vsock_sk_destruct(struct sock *sk); | |
123 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); | |
124 | ||
125 | /* Protocol family. */ | |
126 | static struct proto vsock_proto = { | |
127 | .name = "AF_VSOCK", | |
128 | .owner = THIS_MODULE, | |
129 | .obj_size = sizeof(struct vsock_sock), | |
130 | }; | |
131 | ||
132 | /* The default peer timeout indicates how long we will wait for a peer response | |
133 | * to a control message. | |
134 | */ | |
135 | #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) | |
136 | ||
137 | static const struct vsock_transport *transport; | |
138 | static DEFINE_MUTEX(vsock_register_mutex); | |
139 | ||
140 | /**** EXPORTS ****/ | |
141 | ||
142 | /* Get the ID of the local context. This is transport dependent. */ | |
143 | ||
144 | int vm_sockets_get_local_cid(void) | |
145 | { | |
146 | return transport->get_local_cid(); | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid); | |
149 | ||
150 | /**** UTILS ****/ | |
151 | ||
152 | /* Each bound VSocket is stored in the bind hash table and each connected | |
153 | * VSocket is stored in the connected hash table. | |
154 | * | |
155 | * Unbound sockets are all put on the same list attached to the end of the hash | |
156 | * table (vsock_unbound_sockets). Bound sockets are added to the hash table in | |
157 | * the bucket that their local address hashes to (vsock_bound_sockets(addr) | |
158 | * represents the list that addr hashes to). | |
159 | * | |
160 | * Specifically, we initialize the vsock_bind_table array to a size of | |
161 | * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through | |
162 | * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and | |
163 | * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function | |
164 | * mods with VSOCK_HASH_SIZE to ensure this. | |
165 | */ | |
166 | #define MAX_PORT_RETRIES 24 | |
167 | ||
168 | #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) | |
169 | #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) | |
170 | #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) | |
171 | ||
172 | /* XXX This can probably be implemented in a better way. */ | |
173 | #define VSOCK_CONN_HASH(src, dst) \ | |
174 | (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) | |
175 | #define vsock_connected_sockets(src, dst) \ | |
176 | (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) | |
177 | #define vsock_connected_sockets_vsk(vsk) \ | |
178 | vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) | |
179 | ||
180 | struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; | |
181 | EXPORT_SYMBOL_GPL(vsock_bind_table); | |
182 | struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; | |
183 | EXPORT_SYMBOL_GPL(vsock_connected_table); | |
184 | DEFINE_SPINLOCK(vsock_table_lock); | |
185 | EXPORT_SYMBOL_GPL(vsock_table_lock); | |
186 | ||
187 | /* Autobind this socket to the local address if necessary. */ | |
188 | static int vsock_auto_bind(struct vsock_sock *vsk) | |
189 | { | |
190 | struct sock *sk = sk_vsock(vsk); | |
191 | struct sockaddr_vm local_addr; | |
192 | ||
193 | if (vsock_addr_bound(&vsk->local_addr)) | |
194 | return 0; | |
195 | vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
196 | return __vsock_bind(sk, &local_addr); | |
197 | } | |
198 | ||
199 | static int __init vsock_init_tables(void) | |
200 | { | |
201 | int i; | |
202 | ||
203 | for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) | |
204 | INIT_LIST_HEAD(&vsock_bind_table[i]); | |
205 | ||
206 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) | |
207 | INIT_LIST_HEAD(&vsock_connected_table[i]); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static void __vsock_insert_bound(struct list_head *list, | |
212 | struct vsock_sock *vsk) | |
213 | { | |
214 | sock_hold(&vsk->sk); | |
215 | list_add(&vsk->bound_table, list); | |
216 | } | |
217 | ||
218 | static void __vsock_insert_connected(struct list_head *list, | |
219 | struct vsock_sock *vsk) | |
220 | { | |
221 | sock_hold(&vsk->sk); | |
222 | list_add(&vsk->connected_table, list); | |
223 | } | |
224 | ||
225 | static void __vsock_remove_bound(struct vsock_sock *vsk) | |
226 | { | |
227 | list_del_init(&vsk->bound_table); | |
228 | sock_put(&vsk->sk); | |
229 | } | |
230 | ||
231 | static void __vsock_remove_connected(struct vsock_sock *vsk) | |
232 | { | |
233 | list_del_init(&vsk->connected_table); | |
234 | sock_put(&vsk->sk); | |
235 | } | |
236 | ||
237 | static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) | |
238 | { | |
239 | struct vsock_sock *vsk; | |
240 | ||
241 | list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) | |
242 | if (addr->svm_port == vsk->local_addr.svm_port) | |
243 | return sk_vsock(vsk); | |
244 | ||
245 | return NULL; | |
246 | } | |
247 | ||
248 | static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, | |
249 | struct sockaddr_vm *dst) | |
250 | { | |
251 | struct vsock_sock *vsk; | |
252 | ||
253 | list_for_each_entry(vsk, vsock_connected_sockets(src, dst), | |
254 | connected_table) { | |
255 | if (vsock_addr_equals_addr(src, &vsk->remote_addr) && | |
256 | dst->svm_port == vsk->local_addr.svm_port) { | |
257 | return sk_vsock(vsk); | |
258 | } | |
259 | } | |
260 | ||
261 | return NULL; | |
262 | } | |
263 | ||
264 | static void vsock_insert_unbound(struct vsock_sock *vsk) | |
265 | { | |
266 | spin_lock_bh(&vsock_table_lock); | |
267 | __vsock_insert_bound(vsock_unbound_sockets, vsk); | |
268 | spin_unlock_bh(&vsock_table_lock); | |
269 | } | |
270 | ||
271 | void vsock_insert_connected(struct vsock_sock *vsk) | |
272 | { | |
273 | struct list_head *list = vsock_connected_sockets( | |
274 | &vsk->remote_addr, &vsk->local_addr); | |
275 | ||
276 | spin_lock_bh(&vsock_table_lock); | |
277 | __vsock_insert_connected(list, vsk); | |
278 | spin_unlock_bh(&vsock_table_lock); | |
279 | } | |
280 | EXPORT_SYMBOL_GPL(vsock_insert_connected); | |
281 | ||
282 | void vsock_remove_bound(struct vsock_sock *vsk) | |
283 | { | |
284 | spin_lock_bh(&vsock_table_lock); | |
285 | if (__vsock_in_bound_table(vsk)) | |
286 | __vsock_remove_bound(vsk); | |
287 | spin_unlock_bh(&vsock_table_lock); | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(vsock_remove_bound); | |
290 | ||
291 | void vsock_remove_connected(struct vsock_sock *vsk) | |
292 | { | |
293 | spin_lock_bh(&vsock_table_lock); | |
294 | if (__vsock_in_connected_table(vsk)) | |
295 | __vsock_remove_connected(vsk); | |
296 | spin_unlock_bh(&vsock_table_lock); | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(vsock_remove_connected); | |
299 | ||
300 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) | |
301 | { | |
302 | struct sock *sk; | |
303 | ||
304 | spin_lock_bh(&vsock_table_lock); | |
305 | sk = __vsock_find_bound_socket(addr); | |
306 | if (sk) | |
307 | sock_hold(sk); | |
308 | ||
309 | spin_unlock_bh(&vsock_table_lock); | |
310 | ||
311 | return sk; | |
312 | } | |
313 | EXPORT_SYMBOL_GPL(vsock_find_bound_socket); | |
314 | ||
315 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, | |
316 | struct sockaddr_vm *dst) | |
317 | { | |
318 | struct sock *sk; | |
319 | ||
320 | spin_lock_bh(&vsock_table_lock); | |
321 | sk = __vsock_find_connected_socket(src, dst); | |
322 | if (sk) | |
323 | sock_hold(sk); | |
324 | ||
325 | spin_unlock_bh(&vsock_table_lock); | |
326 | ||
327 | return sk; | |
328 | } | |
329 | EXPORT_SYMBOL_GPL(vsock_find_connected_socket); | |
330 | ||
331 | void vsock_remove_sock(struct vsock_sock *vsk) | |
332 | { | |
333 | vsock_remove_bound(vsk); | |
334 | vsock_remove_connected(vsk); | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(vsock_remove_sock); | |
337 | ||
338 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) | |
339 | { | |
340 | int i; | |
341 | ||
342 | spin_lock_bh(&vsock_table_lock); | |
343 | ||
344 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { | |
345 | struct vsock_sock *vsk; | |
346 | list_for_each_entry(vsk, &vsock_connected_table[i], | |
347 | connected_table) | |
348 | fn(sk_vsock(vsk)); | |
349 | } | |
350 | ||
351 | spin_unlock_bh(&vsock_table_lock); | |
352 | } | |
353 | EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); | |
354 | ||
355 | void vsock_add_pending(struct sock *listener, struct sock *pending) | |
356 | { | |
357 | struct vsock_sock *vlistener; | |
358 | struct vsock_sock *vpending; | |
359 | ||
360 | vlistener = vsock_sk(listener); | |
361 | vpending = vsock_sk(pending); | |
362 | ||
363 | sock_hold(pending); | |
364 | sock_hold(listener); | |
365 | list_add_tail(&vpending->pending_links, &vlistener->pending_links); | |
366 | } | |
367 | EXPORT_SYMBOL_GPL(vsock_add_pending); | |
368 | ||
369 | void vsock_remove_pending(struct sock *listener, struct sock *pending) | |
370 | { | |
371 | struct vsock_sock *vpending = vsock_sk(pending); | |
372 | ||
373 | list_del_init(&vpending->pending_links); | |
374 | sock_put(listener); | |
375 | sock_put(pending); | |
376 | } | |
377 | EXPORT_SYMBOL_GPL(vsock_remove_pending); | |
378 | ||
379 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected) | |
380 | { | |
381 | struct vsock_sock *vlistener; | |
382 | struct vsock_sock *vconnected; | |
383 | ||
384 | vlistener = vsock_sk(listener); | |
385 | vconnected = vsock_sk(connected); | |
386 | ||
387 | sock_hold(connected); | |
388 | sock_hold(listener); | |
389 | list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); | |
390 | } | |
391 | EXPORT_SYMBOL_GPL(vsock_enqueue_accept); | |
392 | ||
393 | static struct sock *vsock_dequeue_accept(struct sock *listener) | |
394 | { | |
395 | struct vsock_sock *vlistener; | |
396 | struct vsock_sock *vconnected; | |
397 | ||
398 | vlistener = vsock_sk(listener); | |
399 | ||
400 | if (list_empty(&vlistener->accept_queue)) | |
401 | return NULL; | |
402 | ||
403 | vconnected = list_entry(vlistener->accept_queue.next, | |
404 | struct vsock_sock, accept_queue); | |
405 | ||
406 | list_del_init(&vconnected->accept_queue); | |
407 | sock_put(listener); | |
408 | /* The caller will need a reference on the connected socket so we let | |
409 | * it call sock_put(). | |
410 | */ | |
411 | ||
412 | return sk_vsock(vconnected); | |
413 | } | |
414 | ||
415 | static bool vsock_is_accept_queue_empty(struct sock *sk) | |
416 | { | |
417 | struct vsock_sock *vsk = vsock_sk(sk); | |
418 | return list_empty(&vsk->accept_queue); | |
419 | } | |
420 | ||
421 | static bool vsock_is_pending(struct sock *sk) | |
422 | { | |
423 | struct vsock_sock *vsk = vsock_sk(sk); | |
424 | return !list_empty(&vsk->pending_links); | |
425 | } | |
426 | ||
427 | static int vsock_send_shutdown(struct sock *sk, int mode) | |
428 | { | |
429 | return transport->shutdown(vsock_sk(sk), mode); | |
430 | } | |
431 | ||
432 | static void vsock_pending_work(struct work_struct *work) | |
433 | { | |
434 | struct sock *sk; | |
435 | struct sock *listener; | |
436 | struct vsock_sock *vsk; | |
437 | bool cleanup; | |
438 | ||
439 | vsk = container_of(work, struct vsock_sock, pending_work.work); | |
440 | sk = sk_vsock(vsk); | |
441 | listener = vsk->listener; | |
442 | cleanup = true; | |
443 | ||
444 | lock_sock(listener); | |
445 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
446 | ||
447 | if (vsock_is_pending(sk)) { | |
448 | vsock_remove_pending(listener, sk); | |
449 | ||
450 | listener->sk_ack_backlog--; | |
451 | } else if (!vsk->rejected) { | |
452 | /* We are not on the pending list and accept() did not reject | |
453 | * us, so we must have been accepted by our user process. We | |
454 | * just need to drop our references to the sockets and be on | |
455 | * our way. | |
456 | */ | |
457 | cleanup = false; | |
458 | goto out; | |
459 | } | |
460 | ||
461 | /* We need to remove ourself from the global connected sockets list so | |
462 | * incoming packets can't find this socket, and to reduce the reference | |
463 | * count. | |
464 | */ | |
465 | vsock_remove_connected(vsk); | |
466 | ||
467 | sk->sk_state = TCP_CLOSE; | |
468 | ||
469 | out: | |
470 | release_sock(sk); | |
471 | release_sock(listener); | |
472 | if (cleanup) | |
473 | sock_put(sk); | |
474 | ||
475 | sock_put(sk); | |
476 | sock_put(listener); | |
477 | } | |
478 | ||
479 | /**** SOCKET OPERATIONS ****/ | |
480 | ||
481 | static int __vsock_bind_stream(struct vsock_sock *vsk, | |
482 | struct sockaddr_vm *addr) | |
483 | { | |
484 | static u32 port = 0; | |
485 | struct sockaddr_vm new_addr; | |
486 | ||
487 | if (!port) | |
488 | port = LAST_RESERVED_PORT + 1 + | |
489 | prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); | |
490 | ||
491 | vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); | |
492 | ||
493 | if (addr->svm_port == VMADDR_PORT_ANY) { | |
494 | bool found = false; | |
495 | unsigned int i; | |
496 | ||
497 | for (i = 0; i < MAX_PORT_RETRIES; i++) { | |
498 | if (port <= LAST_RESERVED_PORT) | |
499 | port = LAST_RESERVED_PORT + 1; | |
500 | ||
501 | new_addr.svm_port = port++; | |
502 | ||
503 | if (!__vsock_find_bound_socket(&new_addr)) { | |
504 | found = true; | |
505 | break; | |
506 | } | |
507 | } | |
508 | ||
509 | if (!found) | |
510 | return -EADDRNOTAVAIL; | |
511 | } else { | |
512 | /* If port is in reserved range, ensure caller | |
513 | * has necessary privileges. | |
514 | */ | |
515 | if (addr->svm_port <= LAST_RESERVED_PORT && | |
516 | !capable(CAP_NET_BIND_SERVICE)) { | |
517 | return -EACCES; | |
518 | } | |
519 | ||
520 | if (__vsock_find_bound_socket(&new_addr)) | |
521 | return -EADDRINUSE; | |
522 | } | |
523 | ||
524 | vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); | |
525 | ||
526 | /* Remove stream sockets from the unbound list and add them to the hash | |
527 | * table for easy lookup by its address. The unbound list is simply an | |
528 | * extra entry at the end of the hash table, a trick used by AF_UNIX. | |
529 | */ | |
530 | __vsock_remove_bound(vsk); | |
531 | __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static int __vsock_bind_dgram(struct vsock_sock *vsk, | |
537 | struct sockaddr_vm *addr) | |
538 | { | |
539 | return transport->dgram_bind(vsk, addr); | |
540 | } | |
541 | ||
542 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) | |
543 | { | |
544 | struct vsock_sock *vsk = vsock_sk(sk); | |
545 | u32 cid; | |
546 | int retval; | |
547 | ||
548 | /* First ensure this socket isn't already bound. */ | |
549 | if (vsock_addr_bound(&vsk->local_addr)) | |
550 | return -EINVAL; | |
551 | ||
552 | /* Now bind to the provided address or select appropriate values if | |
553 | * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that | |
554 | * like AF_INET prevents binding to a non-local IP address (in most | |
555 | * cases), we only allow binding to the local CID. | |
556 | */ | |
557 | cid = transport->get_local_cid(); | |
558 | if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) | |
559 | return -EADDRNOTAVAIL; | |
560 | ||
561 | switch (sk->sk_socket->type) { | |
562 | case SOCK_STREAM: | |
563 | spin_lock_bh(&vsock_table_lock); | |
564 | retval = __vsock_bind_stream(vsk, addr); | |
565 | spin_unlock_bh(&vsock_table_lock); | |
566 | break; | |
567 | ||
568 | case SOCK_DGRAM: | |
569 | retval = __vsock_bind_dgram(vsk, addr); | |
570 | break; | |
571 | ||
572 | default: | |
573 | retval = -EINVAL; | |
574 | break; | |
575 | } | |
576 | ||
577 | return retval; | |
578 | } | |
579 | ||
580 | static void vsock_connect_timeout(struct work_struct *work); | |
581 | ||
582 | struct sock *__vsock_create(struct net *net, | |
583 | struct socket *sock, | |
584 | struct sock *parent, | |
585 | gfp_t priority, | |
586 | unsigned short type, | |
587 | int kern) | |
588 | { | |
589 | struct sock *sk; | |
590 | struct vsock_sock *psk; | |
591 | struct vsock_sock *vsk; | |
592 | ||
593 | sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); | |
594 | if (!sk) | |
595 | return NULL; | |
596 | ||
597 | sock_init_data(sock, sk); | |
598 | ||
599 | /* sk->sk_type is normally set in sock_init_data, but only if sock is | |
600 | * non-NULL. We make sure that our sockets always have a type by | |
601 | * setting it here if needed. | |
602 | */ | |
603 | if (!sock) | |
604 | sk->sk_type = type; | |
605 | ||
606 | vsk = vsock_sk(sk); | |
607 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
608 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
609 | ||
610 | sk->sk_destruct = vsock_sk_destruct; | |
611 | sk->sk_backlog_rcv = vsock_queue_rcv_skb; | |
612 | sock_reset_flag(sk, SOCK_DONE); | |
613 | ||
614 | INIT_LIST_HEAD(&vsk->bound_table); | |
615 | INIT_LIST_HEAD(&vsk->connected_table); | |
616 | vsk->listener = NULL; | |
617 | INIT_LIST_HEAD(&vsk->pending_links); | |
618 | INIT_LIST_HEAD(&vsk->accept_queue); | |
619 | vsk->rejected = false; | |
620 | vsk->sent_request = false; | |
621 | vsk->ignore_connecting_rst = false; | |
622 | vsk->peer_shutdown = 0; | |
623 | INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); | |
624 | INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); | |
625 | ||
626 | psk = parent ? vsock_sk(parent) : NULL; | |
627 | if (parent) { | |
628 | vsk->trusted = psk->trusted; | |
629 | vsk->owner = get_cred(psk->owner); | |
630 | vsk->connect_timeout = psk->connect_timeout; | |
631 | } else { | |
632 | vsk->trusted = capable(CAP_NET_ADMIN); | |
633 | vsk->owner = get_current_cred(); | |
634 | vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
635 | } | |
636 | ||
637 | if (transport->init(vsk, psk) < 0) { | |
638 | sk_free(sk); | |
639 | return NULL; | |
640 | } | |
641 | ||
642 | if (sock) | |
643 | vsock_insert_unbound(vsk); | |
644 | ||
645 | return sk; | |
646 | } | |
647 | EXPORT_SYMBOL_GPL(__vsock_create); | |
648 | ||
649 | static void __vsock_release(struct sock *sk, int level) | |
650 | { | |
651 | if (sk) { | |
652 | struct sk_buff *skb; | |
653 | struct sock *pending; | |
654 | struct vsock_sock *vsk; | |
655 | ||
656 | vsk = vsock_sk(sk); | |
657 | pending = NULL; /* Compiler warning. */ | |
658 | ||
659 | /* The release call is supposed to use lock_sock_nested() | |
660 | * rather than lock_sock(), if a sock lock should be acquired. | |
661 | */ | |
662 | transport->release(vsk); | |
663 | ||
664 | /* When "level" is SINGLE_DEPTH_NESTING, use the nested | |
665 | * version to avoid the warning "possible recursive locking | |
666 | * detected". When "level" is 0, lock_sock_nested(sk, level) | |
667 | * is the same as lock_sock(sk). | |
668 | */ | |
669 | lock_sock_nested(sk, level); | |
670 | sock_orphan(sk); | |
671 | sk->sk_shutdown = SHUTDOWN_MASK; | |
672 | ||
673 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) | |
674 | kfree_skb(skb); | |
675 | ||
676 | /* Clean up any sockets that never were accepted. */ | |
677 | while ((pending = vsock_dequeue_accept(sk)) != NULL) { | |
678 | __vsock_release(pending, SINGLE_DEPTH_NESTING); | |
679 | sock_put(pending); | |
680 | } | |
681 | ||
682 | release_sock(sk); | |
683 | sock_put(sk); | |
684 | } | |
685 | } | |
686 | ||
687 | static void vsock_sk_destruct(struct sock *sk) | |
688 | { | |
689 | struct vsock_sock *vsk = vsock_sk(sk); | |
690 | ||
691 | transport->destruct(vsk); | |
692 | ||
693 | /* When clearing these addresses, there's no need to set the family and | |
694 | * possibly register the address family with the kernel. | |
695 | */ | |
696 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
697 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
698 | ||
699 | put_cred(vsk->owner); | |
700 | } | |
701 | ||
702 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
703 | { | |
704 | int err; | |
705 | ||
706 | err = sock_queue_rcv_skb(sk, skb); | |
707 | if (err) | |
708 | kfree_skb(skb); | |
709 | ||
710 | return err; | |
711 | } | |
712 | ||
713 | s64 vsock_stream_has_data(struct vsock_sock *vsk) | |
714 | { | |
715 | return transport->stream_has_data(vsk); | |
716 | } | |
717 | EXPORT_SYMBOL_GPL(vsock_stream_has_data); | |
718 | ||
719 | s64 vsock_stream_has_space(struct vsock_sock *vsk) | |
720 | { | |
721 | return transport->stream_has_space(vsk); | |
722 | } | |
723 | EXPORT_SYMBOL_GPL(vsock_stream_has_space); | |
724 | ||
725 | static int vsock_release(struct socket *sock) | |
726 | { | |
727 | __vsock_release(sock->sk, 0); | |
728 | sock->sk = NULL; | |
729 | sock->state = SS_FREE; | |
730 | ||
731 | return 0; | |
732 | } | |
733 | ||
734 | static int | |
735 | vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
736 | { | |
737 | int err; | |
738 | struct sock *sk; | |
739 | struct sockaddr_vm *vm_addr; | |
740 | ||
741 | sk = sock->sk; | |
742 | ||
743 | if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) | |
744 | return -EINVAL; | |
745 | ||
746 | lock_sock(sk); | |
747 | err = __vsock_bind(sk, vm_addr); | |
748 | release_sock(sk); | |
749 | ||
750 | return err; | |
751 | } | |
752 | ||
753 | static int vsock_getname(struct socket *sock, | |
754 | struct sockaddr *addr, int *addr_len, int peer) | |
755 | { | |
756 | int err; | |
757 | struct sock *sk; | |
758 | struct vsock_sock *vsk; | |
759 | struct sockaddr_vm *vm_addr; | |
760 | ||
761 | sk = sock->sk; | |
762 | vsk = vsock_sk(sk); | |
763 | err = 0; | |
764 | ||
765 | lock_sock(sk); | |
766 | ||
767 | if (peer) { | |
768 | if (sock->state != SS_CONNECTED) { | |
769 | err = -ENOTCONN; | |
770 | goto out; | |
771 | } | |
772 | vm_addr = &vsk->remote_addr; | |
773 | } else { | |
774 | vm_addr = &vsk->local_addr; | |
775 | } | |
776 | ||
777 | if (!vm_addr) { | |
778 | err = -EINVAL; | |
779 | goto out; | |
780 | } | |
781 | ||
782 | /* sys_getsockname() and sys_getpeername() pass us a | |
783 | * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately | |
784 | * that macro is defined in socket.c instead of .h, so we hardcode its | |
785 | * value here. | |
786 | */ | |
787 | BUILD_BUG_ON(sizeof(*vm_addr) > 128); | |
788 | memcpy(addr, vm_addr, sizeof(*vm_addr)); | |
789 | *addr_len = sizeof(*vm_addr); | |
790 | ||
791 | out: | |
792 | release_sock(sk); | |
793 | return err; | |
794 | } | |
795 | ||
796 | static int vsock_shutdown(struct socket *sock, int mode) | |
797 | { | |
798 | int err; | |
799 | struct sock *sk; | |
800 | ||
801 | /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses | |
802 | * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode | |
803 | * here like the other address families do. Note also that the | |
804 | * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), | |
805 | * which is what we want. | |
806 | */ | |
807 | mode++; | |
808 | ||
809 | if ((mode & ~SHUTDOWN_MASK) || !mode) | |
810 | return -EINVAL; | |
811 | ||
812 | /* If this is a STREAM socket and it is not connected then bail out | |
813 | * immediately. If it is a DGRAM socket then we must first kick the | |
814 | * socket so that it wakes up from any sleeping calls, for example | |
815 | * recv(), and then afterwards return the error. | |
816 | */ | |
817 | ||
818 | sk = sock->sk; | |
819 | if (sock->state == SS_UNCONNECTED) { | |
820 | err = -ENOTCONN; | |
821 | if (sk->sk_type == SOCK_STREAM) | |
822 | return err; | |
823 | } else { | |
824 | sock->state = SS_DISCONNECTING; | |
825 | err = 0; | |
826 | } | |
827 | ||
828 | /* Receive and send shutdowns are treated alike. */ | |
829 | mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); | |
830 | if (mode) { | |
831 | lock_sock(sk); | |
832 | sk->sk_shutdown |= mode; | |
833 | sk->sk_state_change(sk); | |
834 | release_sock(sk); | |
835 | ||
836 | if (sk->sk_type == SOCK_STREAM) { | |
837 | sock_reset_flag(sk, SOCK_DONE); | |
838 | vsock_send_shutdown(sk, mode); | |
839 | } | |
840 | } | |
841 | ||
842 | return err; | |
843 | } | |
844 | ||
845 | static unsigned int vsock_poll(struct file *file, struct socket *sock, | |
846 | poll_table *wait) | |
847 | { | |
848 | struct sock *sk; | |
849 | unsigned int mask; | |
850 | struct vsock_sock *vsk; | |
851 | ||
852 | sk = sock->sk; | |
853 | vsk = vsock_sk(sk); | |
854 | ||
855 | poll_wait(file, sk_sleep(sk), wait); | |
856 | mask = 0; | |
857 | ||
858 | if (sk->sk_err) | |
859 | /* Signify that there has been an error on this socket. */ | |
860 | mask |= POLLERR; | |
861 | ||
862 | /* INET sockets treat local write shutdown and peer write shutdown as a | |
863 | * case of POLLHUP set. | |
864 | */ | |
865 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || | |
866 | ((sk->sk_shutdown & SEND_SHUTDOWN) && | |
867 | (vsk->peer_shutdown & SEND_SHUTDOWN))) { | |
868 | mask |= POLLHUP; | |
869 | } | |
870 | ||
871 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
872 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
873 | mask |= POLLRDHUP; | |
874 | } | |
875 | ||
876 | if (sock->type == SOCK_DGRAM) { | |
877 | /* For datagram sockets we can read if there is something in | |
878 | * the queue and write as long as the socket isn't shutdown for | |
879 | * sending. | |
880 | */ | |
881 | if (!skb_queue_empty_lockless(&sk->sk_receive_queue) || | |
882 | (sk->sk_shutdown & RCV_SHUTDOWN)) { | |
883 | mask |= POLLIN | POLLRDNORM; | |
884 | } | |
885 | ||
886 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
887 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
888 | ||
889 | } else if (sock->type == SOCK_STREAM) { | |
890 | lock_sock(sk); | |
891 | ||
892 | /* Listening sockets that have connections in their accept | |
893 | * queue can be read. | |
894 | */ | |
895 | if (sk->sk_state == TCP_LISTEN | |
896 | && !vsock_is_accept_queue_empty(sk)) | |
897 | mask |= POLLIN | POLLRDNORM; | |
898 | ||
899 | /* If there is something in the queue then we can read. */ | |
900 | if (transport->stream_is_active(vsk) && | |
901 | !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
902 | bool data_ready_now = false; | |
903 | int ret = transport->notify_poll_in( | |
904 | vsk, 1, &data_ready_now); | |
905 | if (ret < 0) { | |
906 | mask |= POLLERR; | |
907 | } else { | |
908 | if (data_ready_now) | |
909 | mask |= POLLIN | POLLRDNORM; | |
910 | ||
911 | } | |
912 | } | |
913 | ||
914 | /* Sockets whose connections have been closed, reset, or | |
915 | * terminated should also be considered read, and we check the | |
916 | * shutdown flag for that. | |
917 | */ | |
918 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
919 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
920 | mask |= POLLIN | POLLRDNORM; | |
921 | } | |
922 | ||
923 | /* Connected sockets that can produce data can be written. */ | |
924 | if (sk->sk_state == TCP_ESTABLISHED) { | |
925 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
926 | bool space_avail_now = false; | |
927 | int ret = transport->notify_poll_out( | |
928 | vsk, 1, &space_avail_now); | |
929 | if (ret < 0) { | |
930 | mask |= POLLERR; | |
931 | } else { | |
932 | if (space_avail_now) | |
933 | /* Remove POLLWRBAND since INET | |
934 | * sockets are not setting it. | |
935 | */ | |
936 | mask |= POLLOUT | POLLWRNORM; | |
937 | ||
938 | } | |
939 | } | |
940 | } | |
941 | ||
942 | /* Simulate INET socket poll behaviors, which sets | |
943 | * POLLOUT|POLLWRNORM when peer is closed and nothing to read, | |
944 | * but local send is not shutdown. | |
945 | */ | |
946 | if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { | |
947 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
948 | mask |= POLLOUT | POLLWRNORM; | |
949 | ||
950 | } | |
951 | ||
952 | release_sock(sk); | |
953 | } | |
954 | ||
955 | return mask; | |
956 | } | |
957 | ||
958 | static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, | |
959 | size_t len) | |
960 | { | |
961 | int err; | |
962 | struct sock *sk; | |
963 | struct vsock_sock *vsk; | |
964 | struct sockaddr_vm *remote_addr; | |
965 | ||
966 | if (msg->msg_flags & MSG_OOB) | |
967 | return -EOPNOTSUPP; | |
968 | ||
969 | /* For now, MSG_DONTWAIT is always assumed... */ | |
970 | err = 0; | |
971 | sk = sock->sk; | |
972 | vsk = vsock_sk(sk); | |
973 | ||
974 | lock_sock(sk); | |
975 | ||
976 | err = vsock_auto_bind(vsk); | |
977 | if (err) | |
978 | goto out; | |
979 | ||
980 | ||
981 | /* If the provided message contains an address, use that. Otherwise | |
982 | * fall back on the socket's remote handle (if it has been connected). | |
983 | */ | |
984 | if (msg->msg_name && | |
985 | vsock_addr_cast(msg->msg_name, msg->msg_namelen, | |
986 | &remote_addr) == 0) { | |
987 | /* Ensure this address is of the right type and is a valid | |
988 | * destination. | |
989 | */ | |
990 | ||
991 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
992 | remote_addr->svm_cid = transport->get_local_cid(); | |
993 | ||
994 | if (!vsock_addr_bound(remote_addr)) { | |
995 | err = -EINVAL; | |
996 | goto out; | |
997 | } | |
998 | } else if (sock->state == SS_CONNECTED) { | |
999 | remote_addr = &vsk->remote_addr; | |
1000 | ||
1001 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
1002 | remote_addr->svm_cid = transport->get_local_cid(); | |
1003 | ||
1004 | /* XXX Should connect() or this function ensure remote_addr is | |
1005 | * bound? | |
1006 | */ | |
1007 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1008 | err = -EINVAL; | |
1009 | goto out; | |
1010 | } | |
1011 | } else { | |
1012 | err = -EINVAL; | |
1013 | goto out; | |
1014 | } | |
1015 | ||
1016 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1017 | remote_addr->svm_port)) { | |
1018 | err = -EINVAL; | |
1019 | goto out; | |
1020 | } | |
1021 | ||
1022 | err = transport->dgram_enqueue(vsk, remote_addr, msg, len); | |
1023 | ||
1024 | out: | |
1025 | release_sock(sk); | |
1026 | return err; | |
1027 | } | |
1028 | ||
1029 | static int vsock_dgram_connect(struct socket *sock, | |
1030 | struct sockaddr *addr, int addr_len, int flags) | |
1031 | { | |
1032 | int err; | |
1033 | struct sock *sk; | |
1034 | struct vsock_sock *vsk; | |
1035 | struct sockaddr_vm *remote_addr; | |
1036 | ||
1037 | sk = sock->sk; | |
1038 | vsk = vsock_sk(sk); | |
1039 | ||
1040 | err = vsock_addr_cast(addr, addr_len, &remote_addr); | |
1041 | if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { | |
1042 | lock_sock(sk); | |
1043 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, | |
1044 | VMADDR_PORT_ANY); | |
1045 | sock->state = SS_UNCONNECTED; | |
1046 | release_sock(sk); | |
1047 | return 0; | |
1048 | } else if (err != 0) | |
1049 | return -EINVAL; | |
1050 | ||
1051 | lock_sock(sk); | |
1052 | ||
1053 | err = vsock_auto_bind(vsk); | |
1054 | if (err) | |
1055 | goto out; | |
1056 | ||
1057 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1058 | remote_addr->svm_port)) { | |
1059 | err = -EINVAL; | |
1060 | goto out; | |
1061 | } | |
1062 | ||
1063 | memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); | |
1064 | sock->state = SS_CONNECTED; | |
1065 | ||
1066 | out: | |
1067 | release_sock(sk); | |
1068 | return err; | |
1069 | } | |
1070 | ||
1071 | static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, | |
1072 | size_t len, int flags) | |
1073 | { | |
1074 | return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags); | |
1075 | } | |
1076 | ||
1077 | static const struct proto_ops vsock_dgram_ops = { | |
1078 | .family = PF_VSOCK, | |
1079 | .owner = THIS_MODULE, | |
1080 | .release = vsock_release, | |
1081 | .bind = vsock_bind, | |
1082 | .connect = vsock_dgram_connect, | |
1083 | .socketpair = sock_no_socketpair, | |
1084 | .accept = sock_no_accept, | |
1085 | .getname = vsock_getname, | |
1086 | .poll = vsock_poll, | |
1087 | .ioctl = sock_no_ioctl, | |
1088 | .listen = sock_no_listen, | |
1089 | .shutdown = vsock_shutdown, | |
1090 | .setsockopt = sock_no_setsockopt, | |
1091 | .getsockopt = sock_no_getsockopt, | |
1092 | .sendmsg = vsock_dgram_sendmsg, | |
1093 | .recvmsg = vsock_dgram_recvmsg, | |
1094 | .mmap = sock_no_mmap, | |
1095 | .sendpage = sock_no_sendpage, | |
1096 | }; | |
1097 | ||
1098 | static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) | |
1099 | { | |
1100 | if (!transport->cancel_pkt) | |
1101 | return -EOPNOTSUPP; | |
1102 | ||
1103 | return transport->cancel_pkt(vsk); | |
1104 | } | |
1105 | ||
1106 | static void vsock_connect_timeout(struct work_struct *work) | |
1107 | { | |
1108 | struct sock *sk; | |
1109 | struct vsock_sock *vsk; | |
1110 | int cancel = 0; | |
1111 | ||
1112 | vsk = container_of(work, struct vsock_sock, connect_work.work); | |
1113 | sk = sk_vsock(vsk); | |
1114 | ||
1115 | lock_sock(sk); | |
1116 | if (sk->sk_state == TCP_SYN_SENT && | |
1117 | (sk->sk_shutdown != SHUTDOWN_MASK)) { | |
1118 | sk->sk_state = TCP_CLOSE; | |
1119 | sk->sk_err = ETIMEDOUT; | |
1120 | sk->sk_error_report(sk); | |
1121 | cancel = 1; | |
1122 | } | |
1123 | release_sock(sk); | |
1124 | if (cancel) | |
1125 | vsock_transport_cancel_pkt(vsk); | |
1126 | ||
1127 | sock_put(sk); | |
1128 | } | |
1129 | ||
1130 | static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, | |
1131 | int addr_len, int flags) | |
1132 | { | |
1133 | int err; | |
1134 | struct sock *sk; | |
1135 | struct vsock_sock *vsk; | |
1136 | struct sockaddr_vm *remote_addr; | |
1137 | long timeout; | |
1138 | DEFINE_WAIT(wait); | |
1139 | ||
1140 | err = 0; | |
1141 | sk = sock->sk; | |
1142 | vsk = vsock_sk(sk); | |
1143 | ||
1144 | lock_sock(sk); | |
1145 | ||
1146 | /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ | |
1147 | switch (sock->state) { | |
1148 | case SS_CONNECTED: | |
1149 | err = -EISCONN; | |
1150 | goto out; | |
1151 | case SS_DISCONNECTING: | |
1152 | err = -EINVAL; | |
1153 | goto out; | |
1154 | case SS_CONNECTING: | |
1155 | /* This continues on so we can move sock into the SS_CONNECTED | |
1156 | * state once the connection has completed (at which point err | |
1157 | * will be set to zero also). Otherwise, we will either wait | |
1158 | * for the connection or return -EALREADY should this be a | |
1159 | * non-blocking call. | |
1160 | */ | |
1161 | err = -EALREADY; | |
1162 | break; | |
1163 | default: | |
1164 | if ((sk->sk_state == TCP_LISTEN) || | |
1165 | vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { | |
1166 | err = -EINVAL; | |
1167 | goto out; | |
1168 | } | |
1169 | ||
1170 | /* The hypervisor and well-known contexts do not have socket | |
1171 | * endpoints. | |
1172 | */ | |
1173 | if (!transport->stream_allow(remote_addr->svm_cid, | |
1174 | remote_addr->svm_port)) { | |
1175 | err = -ENETUNREACH; | |
1176 | goto out; | |
1177 | } | |
1178 | ||
1179 | /* Set the remote address that we are connecting to. */ | |
1180 | memcpy(&vsk->remote_addr, remote_addr, | |
1181 | sizeof(vsk->remote_addr)); | |
1182 | ||
1183 | err = vsock_auto_bind(vsk); | |
1184 | if (err) | |
1185 | goto out; | |
1186 | ||
1187 | sk->sk_state = TCP_SYN_SENT; | |
1188 | ||
1189 | err = transport->connect(vsk); | |
1190 | if (err < 0) | |
1191 | goto out; | |
1192 | ||
1193 | /* Mark sock as connecting and set the error code to in | |
1194 | * progress in case this is a non-blocking connect. | |
1195 | */ | |
1196 | sock->state = SS_CONNECTING; | |
1197 | err = -EINPROGRESS; | |
1198 | } | |
1199 | ||
1200 | /* The receive path will handle all communication until we are able to | |
1201 | * enter the connected state. Here we wait for the connection to be | |
1202 | * completed or a notification of an error. | |
1203 | */ | |
1204 | timeout = vsk->connect_timeout; | |
1205 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1206 | ||
1207 | while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { | |
1208 | if (flags & O_NONBLOCK) { | |
1209 | /* If we're not going to block, we schedule a timeout | |
1210 | * function to generate a timeout on the connection | |
1211 | * attempt, in case the peer doesn't respond in a | |
1212 | * timely manner. We hold on to the socket until the | |
1213 | * timeout fires. | |
1214 | */ | |
1215 | sock_hold(sk); | |
1216 | schedule_delayed_work(&vsk->connect_work, timeout); | |
1217 | ||
1218 | /* Skip ahead to preserve error code set above. */ | |
1219 | goto out_wait; | |
1220 | } | |
1221 | ||
1222 | release_sock(sk); | |
1223 | timeout = schedule_timeout(timeout); | |
1224 | lock_sock(sk); | |
1225 | ||
1226 | if (signal_pending(current)) { | |
1227 | err = sock_intr_errno(timeout); | |
1228 | sk->sk_state = TCP_CLOSE; | |
1229 | sock->state = SS_UNCONNECTED; | |
1230 | vsock_transport_cancel_pkt(vsk); | |
1231 | goto out_wait; | |
1232 | } else if (timeout == 0) { | |
1233 | err = -ETIMEDOUT; | |
1234 | sk->sk_state = TCP_CLOSE; | |
1235 | sock->state = SS_UNCONNECTED; | |
1236 | vsock_transport_cancel_pkt(vsk); | |
1237 | goto out_wait; | |
1238 | } | |
1239 | ||
1240 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1241 | } | |
1242 | ||
1243 | if (sk->sk_err) { | |
1244 | err = -sk->sk_err; | |
1245 | sk->sk_state = TCP_CLOSE; | |
1246 | sock->state = SS_UNCONNECTED; | |
1247 | } else { | |
1248 | err = 0; | |
1249 | } | |
1250 | ||
1251 | out_wait: | |
1252 | finish_wait(sk_sleep(sk), &wait); | |
1253 | out: | |
1254 | release_sock(sk); | |
1255 | return err; | |
1256 | } | |
1257 | ||
1258 | static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, | |
1259 | bool kern) | |
1260 | { | |
1261 | struct sock *listener; | |
1262 | int err; | |
1263 | struct sock *connected; | |
1264 | struct vsock_sock *vconnected; | |
1265 | long timeout; | |
1266 | DEFINE_WAIT(wait); | |
1267 | ||
1268 | err = 0; | |
1269 | listener = sock->sk; | |
1270 | ||
1271 | lock_sock(listener); | |
1272 | ||
1273 | if (sock->type != SOCK_STREAM) { | |
1274 | err = -EOPNOTSUPP; | |
1275 | goto out; | |
1276 | } | |
1277 | ||
1278 | if (listener->sk_state != TCP_LISTEN) { | |
1279 | err = -EINVAL; | |
1280 | goto out; | |
1281 | } | |
1282 | ||
1283 | /* Wait for children sockets to appear; these are the new sockets | |
1284 | * created upon connection establishment. | |
1285 | */ | |
1286 | timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); | |
1287 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1288 | ||
1289 | while ((connected = vsock_dequeue_accept(listener)) == NULL && | |
1290 | listener->sk_err == 0) { | |
1291 | release_sock(listener); | |
1292 | timeout = schedule_timeout(timeout); | |
1293 | finish_wait(sk_sleep(listener), &wait); | |
1294 | lock_sock(listener); | |
1295 | ||
1296 | if (signal_pending(current)) { | |
1297 | err = sock_intr_errno(timeout); | |
1298 | goto out; | |
1299 | } else if (timeout == 0) { | |
1300 | err = -EAGAIN; | |
1301 | goto out; | |
1302 | } | |
1303 | ||
1304 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1305 | } | |
1306 | finish_wait(sk_sleep(listener), &wait); | |
1307 | ||
1308 | if (listener->sk_err) | |
1309 | err = -listener->sk_err; | |
1310 | ||
1311 | if (connected) { | |
1312 | listener->sk_ack_backlog--; | |
1313 | ||
1314 | lock_sock_nested(connected, SINGLE_DEPTH_NESTING); | |
1315 | vconnected = vsock_sk(connected); | |
1316 | ||
1317 | /* If the listener socket has received an error, then we should | |
1318 | * reject this socket and return. Note that we simply mark the | |
1319 | * socket rejected, drop our reference, and let the cleanup | |
1320 | * function handle the cleanup; the fact that we found it in | |
1321 | * the listener's accept queue guarantees that the cleanup | |
1322 | * function hasn't run yet. | |
1323 | */ | |
1324 | if (err) { | |
1325 | vconnected->rejected = true; | |
1326 | } else { | |
1327 | newsock->state = SS_CONNECTED; | |
1328 | sock_graft(connected, newsock); | |
1329 | } | |
1330 | ||
1331 | release_sock(connected); | |
1332 | sock_put(connected); | |
1333 | } | |
1334 | ||
1335 | out: | |
1336 | release_sock(listener); | |
1337 | return err; | |
1338 | } | |
1339 | ||
1340 | static int vsock_listen(struct socket *sock, int backlog) | |
1341 | { | |
1342 | int err; | |
1343 | struct sock *sk; | |
1344 | struct vsock_sock *vsk; | |
1345 | ||
1346 | sk = sock->sk; | |
1347 | ||
1348 | lock_sock(sk); | |
1349 | ||
1350 | if (sock->type != SOCK_STREAM) { | |
1351 | err = -EOPNOTSUPP; | |
1352 | goto out; | |
1353 | } | |
1354 | ||
1355 | if (sock->state != SS_UNCONNECTED) { | |
1356 | err = -EINVAL; | |
1357 | goto out; | |
1358 | } | |
1359 | ||
1360 | vsk = vsock_sk(sk); | |
1361 | ||
1362 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1363 | err = -EINVAL; | |
1364 | goto out; | |
1365 | } | |
1366 | ||
1367 | sk->sk_max_ack_backlog = backlog; | |
1368 | sk->sk_state = TCP_LISTEN; | |
1369 | ||
1370 | err = 0; | |
1371 | ||
1372 | out: | |
1373 | release_sock(sk); | |
1374 | return err; | |
1375 | } | |
1376 | ||
1377 | static int vsock_stream_setsockopt(struct socket *sock, | |
1378 | int level, | |
1379 | int optname, | |
1380 | char __user *optval, | |
1381 | unsigned int optlen) | |
1382 | { | |
1383 | int err; | |
1384 | struct sock *sk; | |
1385 | struct vsock_sock *vsk; | |
1386 | u64 val; | |
1387 | ||
1388 | if (level != AF_VSOCK) | |
1389 | return -ENOPROTOOPT; | |
1390 | ||
1391 | #define COPY_IN(_v) \ | |
1392 | do { \ | |
1393 | if (optlen < sizeof(_v)) { \ | |
1394 | err = -EINVAL; \ | |
1395 | goto exit; \ | |
1396 | } \ | |
1397 | if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ | |
1398 | err = -EFAULT; \ | |
1399 | goto exit; \ | |
1400 | } \ | |
1401 | } while (0) | |
1402 | ||
1403 | err = 0; | |
1404 | sk = sock->sk; | |
1405 | vsk = vsock_sk(sk); | |
1406 | ||
1407 | lock_sock(sk); | |
1408 | ||
1409 | switch (optname) { | |
1410 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1411 | COPY_IN(val); | |
1412 | transport->set_buffer_size(vsk, val); | |
1413 | break; | |
1414 | ||
1415 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1416 | COPY_IN(val); | |
1417 | transport->set_max_buffer_size(vsk, val); | |
1418 | break; | |
1419 | ||
1420 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1421 | COPY_IN(val); | |
1422 | transport->set_min_buffer_size(vsk, val); | |
1423 | break; | |
1424 | ||
1425 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
1426 | struct timeval tv; | |
1427 | COPY_IN(tv); | |
1428 | if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && | |
1429 | tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { | |
1430 | vsk->connect_timeout = tv.tv_sec * HZ + | |
1431 | DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); | |
1432 | if (vsk->connect_timeout == 0) | |
1433 | vsk->connect_timeout = | |
1434 | VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
1435 | ||
1436 | } else { | |
1437 | err = -ERANGE; | |
1438 | } | |
1439 | break; | |
1440 | } | |
1441 | ||
1442 | default: | |
1443 | err = -ENOPROTOOPT; | |
1444 | break; | |
1445 | } | |
1446 | ||
1447 | #undef COPY_IN | |
1448 | ||
1449 | exit: | |
1450 | release_sock(sk); | |
1451 | return err; | |
1452 | } | |
1453 | ||
1454 | static int vsock_stream_getsockopt(struct socket *sock, | |
1455 | int level, int optname, | |
1456 | char __user *optval, | |
1457 | int __user *optlen) | |
1458 | { | |
1459 | int err; | |
1460 | int len; | |
1461 | struct sock *sk; | |
1462 | struct vsock_sock *vsk; | |
1463 | u64 val; | |
1464 | ||
1465 | if (level != AF_VSOCK) | |
1466 | return -ENOPROTOOPT; | |
1467 | ||
1468 | err = get_user(len, optlen); | |
1469 | if (err != 0) | |
1470 | return err; | |
1471 | ||
1472 | #define COPY_OUT(_v) \ | |
1473 | do { \ | |
1474 | if (len < sizeof(_v)) \ | |
1475 | return -EINVAL; \ | |
1476 | \ | |
1477 | len = sizeof(_v); \ | |
1478 | if (copy_to_user(optval, &_v, len) != 0) \ | |
1479 | return -EFAULT; \ | |
1480 | \ | |
1481 | } while (0) | |
1482 | ||
1483 | err = 0; | |
1484 | sk = sock->sk; | |
1485 | vsk = vsock_sk(sk); | |
1486 | ||
1487 | switch (optname) { | |
1488 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1489 | val = transport->get_buffer_size(vsk); | |
1490 | COPY_OUT(val); | |
1491 | break; | |
1492 | ||
1493 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1494 | val = transport->get_max_buffer_size(vsk); | |
1495 | COPY_OUT(val); | |
1496 | break; | |
1497 | ||
1498 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1499 | val = transport->get_min_buffer_size(vsk); | |
1500 | COPY_OUT(val); | |
1501 | break; | |
1502 | ||
1503 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
1504 | struct timeval tv; | |
1505 | tv.tv_sec = vsk->connect_timeout / HZ; | |
1506 | tv.tv_usec = | |
1507 | (vsk->connect_timeout - | |
1508 | tv.tv_sec * HZ) * (1000000 / HZ); | |
1509 | COPY_OUT(tv); | |
1510 | break; | |
1511 | } | |
1512 | default: | |
1513 | return -ENOPROTOOPT; | |
1514 | } | |
1515 | ||
1516 | err = put_user(len, optlen); | |
1517 | if (err != 0) | |
1518 | return -EFAULT; | |
1519 | ||
1520 | #undef COPY_OUT | |
1521 | ||
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, | |
1526 | size_t len) | |
1527 | { | |
1528 | struct sock *sk; | |
1529 | struct vsock_sock *vsk; | |
1530 | ssize_t total_written; | |
1531 | long timeout; | |
1532 | int err; | |
1533 | struct vsock_transport_send_notify_data send_data; | |
1534 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
1535 | ||
1536 | sk = sock->sk; | |
1537 | vsk = vsock_sk(sk); | |
1538 | total_written = 0; | |
1539 | err = 0; | |
1540 | ||
1541 | if (msg->msg_flags & MSG_OOB) | |
1542 | return -EOPNOTSUPP; | |
1543 | ||
1544 | lock_sock(sk); | |
1545 | ||
1546 | /* Callers should not provide a destination with stream sockets. */ | |
1547 | if (msg->msg_namelen) { | |
1548 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; | |
1549 | goto out; | |
1550 | } | |
1551 | ||
1552 | /* Send data only if both sides are not shutdown in the direction. */ | |
1553 | if (sk->sk_shutdown & SEND_SHUTDOWN || | |
1554 | vsk->peer_shutdown & RCV_SHUTDOWN) { | |
1555 | err = -EPIPE; | |
1556 | goto out; | |
1557 | } | |
1558 | ||
1559 | if (sk->sk_state != TCP_ESTABLISHED || | |
1560 | !vsock_addr_bound(&vsk->local_addr)) { | |
1561 | err = -ENOTCONN; | |
1562 | goto out; | |
1563 | } | |
1564 | ||
1565 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1566 | err = -EDESTADDRREQ; | |
1567 | goto out; | |
1568 | } | |
1569 | ||
1570 | /* Wait for room in the produce queue to enqueue our user's data. */ | |
1571 | timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1572 | ||
1573 | err = transport->notify_send_init(vsk, &send_data); | |
1574 | if (err < 0) | |
1575 | goto out; | |
1576 | ||
1577 | while (total_written < len) { | |
1578 | ssize_t written; | |
1579 | ||
1580 | add_wait_queue(sk_sleep(sk), &wait); | |
1581 | while (vsock_stream_has_space(vsk) == 0 && | |
1582 | sk->sk_err == 0 && | |
1583 | !(sk->sk_shutdown & SEND_SHUTDOWN) && | |
1584 | !(vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1585 | ||
1586 | /* Don't wait for non-blocking sockets. */ | |
1587 | if (timeout == 0) { | |
1588 | err = -EAGAIN; | |
1589 | remove_wait_queue(sk_sleep(sk), &wait); | |
1590 | goto out_err; | |
1591 | } | |
1592 | ||
1593 | err = transport->notify_send_pre_block(vsk, &send_data); | |
1594 | if (err < 0) { | |
1595 | remove_wait_queue(sk_sleep(sk), &wait); | |
1596 | goto out_err; | |
1597 | } | |
1598 | ||
1599 | release_sock(sk); | |
1600 | timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); | |
1601 | lock_sock(sk); | |
1602 | if (signal_pending(current)) { | |
1603 | err = sock_intr_errno(timeout); | |
1604 | remove_wait_queue(sk_sleep(sk), &wait); | |
1605 | goto out_err; | |
1606 | } else if (timeout == 0) { | |
1607 | err = -EAGAIN; | |
1608 | remove_wait_queue(sk_sleep(sk), &wait); | |
1609 | goto out_err; | |
1610 | } | |
1611 | } | |
1612 | remove_wait_queue(sk_sleep(sk), &wait); | |
1613 | ||
1614 | /* These checks occur both as part of and after the loop | |
1615 | * conditional since we need to check before and after | |
1616 | * sleeping. | |
1617 | */ | |
1618 | if (sk->sk_err) { | |
1619 | err = -sk->sk_err; | |
1620 | goto out_err; | |
1621 | } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || | |
1622 | (vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1623 | err = -EPIPE; | |
1624 | goto out_err; | |
1625 | } | |
1626 | ||
1627 | err = transport->notify_send_pre_enqueue(vsk, &send_data); | |
1628 | if (err < 0) | |
1629 | goto out_err; | |
1630 | ||
1631 | /* Note that enqueue will only write as many bytes as are free | |
1632 | * in the produce queue, so we don't need to ensure len is | |
1633 | * smaller than the queue size. It is the caller's | |
1634 | * responsibility to check how many bytes we were able to send. | |
1635 | */ | |
1636 | ||
1637 | written = transport->stream_enqueue( | |
1638 | vsk, msg, | |
1639 | len - total_written); | |
1640 | if (written < 0) { | |
1641 | err = -ENOMEM; | |
1642 | goto out_err; | |
1643 | } | |
1644 | ||
1645 | total_written += written; | |
1646 | ||
1647 | err = transport->notify_send_post_enqueue( | |
1648 | vsk, written, &send_data); | |
1649 | if (err < 0) | |
1650 | goto out_err; | |
1651 | ||
1652 | } | |
1653 | ||
1654 | out_err: | |
1655 | if (total_written > 0) | |
1656 | err = total_written; | |
1657 | out: | |
1658 | release_sock(sk); | |
1659 | return err; | |
1660 | } | |
1661 | ||
1662 | ||
1663 | static int | |
1664 | vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, | |
1665 | int flags) | |
1666 | { | |
1667 | struct sock *sk; | |
1668 | struct vsock_sock *vsk; | |
1669 | int err; | |
1670 | size_t target; | |
1671 | ssize_t copied; | |
1672 | long timeout; | |
1673 | struct vsock_transport_recv_notify_data recv_data; | |
1674 | ||
1675 | DEFINE_WAIT(wait); | |
1676 | ||
1677 | sk = sock->sk; | |
1678 | vsk = vsock_sk(sk); | |
1679 | err = 0; | |
1680 | ||
1681 | lock_sock(sk); | |
1682 | ||
1683 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1684 | /* Recvmsg is supposed to return 0 if a peer performs an | |
1685 | * orderly shutdown. Differentiate between that case and when a | |
1686 | * peer has not connected or a local shutdown occured with the | |
1687 | * SOCK_DONE flag. | |
1688 | */ | |
1689 | if (sock_flag(sk, SOCK_DONE)) | |
1690 | err = 0; | |
1691 | else | |
1692 | err = -ENOTCONN; | |
1693 | ||
1694 | goto out; | |
1695 | } | |
1696 | ||
1697 | if (flags & MSG_OOB) { | |
1698 | err = -EOPNOTSUPP; | |
1699 | goto out; | |
1700 | } | |
1701 | ||
1702 | /* We don't check peer_shutdown flag here since peer may actually shut | |
1703 | * down, but there can be data in the queue that a local socket can | |
1704 | * receive. | |
1705 | */ | |
1706 | if (sk->sk_shutdown & RCV_SHUTDOWN) { | |
1707 | err = 0; | |
1708 | goto out; | |
1709 | } | |
1710 | ||
1711 | /* It is valid on Linux to pass in a zero-length receive buffer. This | |
1712 | * is not an error. We may as well bail out now. | |
1713 | */ | |
1714 | if (!len) { | |
1715 | err = 0; | |
1716 | goto out; | |
1717 | } | |
1718 | ||
1719 | /* We must not copy less than target bytes into the user's buffer | |
1720 | * before returning successfully, so we wait for the consume queue to | |
1721 | * have that much data to consume before dequeueing. Note that this | |
1722 | * makes it impossible to handle cases where target is greater than the | |
1723 | * queue size. | |
1724 | */ | |
1725 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1726 | if (target >= transport->stream_rcvhiwat(vsk)) { | |
1727 | err = -ENOMEM; | |
1728 | goto out; | |
1729 | } | |
1730 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1731 | copied = 0; | |
1732 | ||
1733 | err = transport->notify_recv_init(vsk, target, &recv_data); | |
1734 | if (err < 0) | |
1735 | goto out; | |
1736 | ||
1737 | ||
1738 | while (1) { | |
1739 | s64 ready; | |
1740 | ||
1741 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1742 | ready = vsock_stream_has_data(vsk); | |
1743 | ||
1744 | if (ready == 0) { | |
1745 | if (sk->sk_err != 0 || | |
1746 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1747 | (vsk->peer_shutdown & SEND_SHUTDOWN)) { | |
1748 | finish_wait(sk_sleep(sk), &wait); | |
1749 | break; | |
1750 | } | |
1751 | /* Don't wait for non-blocking sockets. */ | |
1752 | if (timeout == 0) { | |
1753 | err = -EAGAIN; | |
1754 | finish_wait(sk_sleep(sk), &wait); | |
1755 | break; | |
1756 | } | |
1757 | ||
1758 | err = transport->notify_recv_pre_block( | |
1759 | vsk, target, &recv_data); | |
1760 | if (err < 0) { | |
1761 | finish_wait(sk_sleep(sk), &wait); | |
1762 | break; | |
1763 | } | |
1764 | release_sock(sk); | |
1765 | timeout = schedule_timeout(timeout); | |
1766 | lock_sock(sk); | |
1767 | ||
1768 | if (signal_pending(current)) { | |
1769 | err = sock_intr_errno(timeout); | |
1770 | finish_wait(sk_sleep(sk), &wait); | |
1771 | break; | |
1772 | } else if (timeout == 0) { | |
1773 | err = -EAGAIN; | |
1774 | finish_wait(sk_sleep(sk), &wait); | |
1775 | break; | |
1776 | } | |
1777 | } else { | |
1778 | ssize_t read; | |
1779 | ||
1780 | finish_wait(sk_sleep(sk), &wait); | |
1781 | ||
1782 | if (ready < 0) { | |
1783 | /* Invalid queue pair content. XXX This should | |
1784 | * be changed to a connection reset in a later | |
1785 | * change. | |
1786 | */ | |
1787 | ||
1788 | err = -ENOMEM; | |
1789 | goto out; | |
1790 | } | |
1791 | ||
1792 | err = transport->notify_recv_pre_dequeue( | |
1793 | vsk, target, &recv_data); | |
1794 | if (err < 0) | |
1795 | break; | |
1796 | ||
1797 | read = transport->stream_dequeue( | |
1798 | vsk, msg, | |
1799 | len - copied, flags); | |
1800 | if (read < 0) { | |
1801 | err = -ENOMEM; | |
1802 | break; | |
1803 | } | |
1804 | ||
1805 | copied += read; | |
1806 | ||
1807 | err = transport->notify_recv_post_dequeue( | |
1808 | vsk, target, read, | |
1809 | !(flags & MSG_PEEK), &recv_data); | |
1810 | if (err < 0) | |
1811 | goto out; | |
1812 | ||
1813 | if (read >= target || flags & MSG_PEEK) | |
1814 | break; | |
1815 | ||
1816 | target -= read; | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | if (sk->sk_err) | |
1821 | err = -sk->sk_err; | |
1822 | else if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1823 | err = 0; | |
1824 | ||
1825 | if (copied > 0) | |
1826 | err = copied; | |
1827 | ||
1828 | out: | |
1829 | release_sock(sk); | |
1830 | return err; | |
1831 | } | |
1832 | ||
1833 | static const struct proto_ops vsock_stream_ops = { | |
1834 | .family = PF_VSOCK, | |
1835 | .owner = THIS_MODULE, | |
1836 | .release = vsock_release, | |
1837 | .bind = vsock_bind, | |
1838 | .connect = vsock_stream_connect, | |
1839 | .socketpair = sock_no_socketpair, | |
1840 | .accept = vsock_accept, | |
1841 | .getname = vsock_getname, | |
1842 | .poll = vsock_poll, | |
1843 | .ioctl = sock_no_ioctl, | |
1844 | .listen = vsock_listen, | |
1845 | .shutdown = vsock_shutdown, | |
1846 | .setsockopt = vsock_stream_setsockopt, | |
1847 | .getsockopt = vsock_stream_getsockopt, | |
1848 | .sendmsg = vsock_stream_sendmsg, | |
1849 | .recvmsg = vsock_stream_recvmsg, | |
1850 | .mmap = sock_no_mmap, | |
1851 | .sendpage = sock_no_sendpage, | |
1852 | }; | |
1853 | ||
1854 | static int vsock_create(struct net *net, struct socket *sock, | |
1855 | int protocol, int kern) | |
1856 | { | |
1857 | if (!sock) | |
1858 | return -EINVAL; | |
1859 | ||
1860 | if (protocol && protocol != PF_VSOCK) | |
1861 | return -EPROTONOSUPPORT; | |
1862 | ||
1863 | switch (sock->type) { | |
1864 | case SOCK_DGRAM: | |
1865 | sock->ops = &vsock_dgram_ops; | |
1866 | break; | |
1867 | case SOCK_STREAM: | |
1868 | sock->ops = &vsock_stream_ops; | |
1869 | break; | |
1870 | default: | |
1871 | return -ESOCKTNOSUPPORT; | |
1872 | } | |
1873 | ||
1874 | sock->state = SS_UNCONNECTED; | |
1875 | ||
1876 | return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM; | |
1877 | } | |
1878 | ||
1879 | static const struct net_proto_family vsock_family_ops = { | |
1880 | .family = AF_VSOCK, | |
1881 | .create = vsock_create, | |
1882 | .owner = THIS_MODULE, | |
1883 | }; | |
1884 | ||
1885 | static long vsock_dev_do_ioctl(struct file *filp, | |
1886 | unsigned int cmd, void __user *ptr) | |
1887 | { | |
1888 | u32 __user *p = ptr; | |
1889 | int retval = 0; | |
1890 | ||
1891 | switch (cmd) { | |
1892 | case IOCTL_VM_SOCKETS_GET_LOCAL_CID: | |
1893 | if (put_user(transport->get_local_cid(), p) != 0) | |
1894 | retval = -EFAULT; | |
1895 | break; | |
1896 | ||
1897 | default: | |
1898 | pr_err("Unknown ioctl %d\n", cmd); | |
1899 | retval = -EINVAL; | |
1900 | } | |
1901 | ||
1902 | return retval; | |
1903 | } | |
1904 | ||
1905 | static long vsock_dev_ioctl(struct file *filp, | |
1906 | unsigned int cmd, unsigned long arg) | |
1907 | { | |
1908 | return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); | |
1909 | } | |
1910 | ||
1911 | #ifdef CONFIG_COMPAT | |
1912 | static long vsock_dev_compat_ioctl(struct file *filp, | |
1913 | unsigned int cmd, unsigned long arg) | |
1914 | { | |
1915 | return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); | |
1916 | } | |
1917 | #endif | |
1918 | ||
1919 | static const struct file_operations vsock_device_ops = { | |
1920 | .owner = THIS_MODULE, | |
1921 | .unlocked_ioctl = vsock_dev_ioctl, | |
1922 | #ifdef CONFIG_COMPAT | |
1923 | .compat_ioctl = vsock_dev_compat_ioctl, | |
1924 | #endif | |
1925 | .open = nonseekable_open, | |
1926 | }; | |
1927 | ||
1928 | static struct miscdevice vsock_device = { | |
1929 | .name = "vsock", | |
1930 | .fops = &vsock_device_ops, | |
1931 | }; | |
1932 | ||
1933 | int __vsock_core_init(const struct vsock_transport *t, struct module *owner) | |
1934 | { | |
1935 | int err = mutex_lock_interruptible(&vsock_register_mutex); | |
1936 | ||
1937 | if (err) | |
1938 | return err; | |
1939 | ||
1940 | if (transport) { | |
1941 | err = -EBUSY; | |
1942 | goto err_busy; | |
1943 | } | |
1944 | ||
1945 | /* Transport must be the owner of the protocol so that it can't | |
1946 | * unload while there are open sockets. | |
1947 | */ | |
1948 | vsock_proto.owner = owner; | |
1949 | transport = t; | |
1950 | ||
1951 | vsock_device.minor = MISC_DYNAMIC_MINOR; | |
1952 | err = misc_register(&vsock_device); | |
1953 | if (err) { | |
1954 | pr_err("Failed to register misc device\n"); | |
1955 | goto err_reset_transport; | |
1956 | } | |
1957 | ||
1958 | err = proto_register(&vsock_proto, 1); /* we want our slab */ | |
1959 | if (err) { | |
1960 | pr_err("Cannot register vsock protocol\n"); | |
1961 | goto err_deregister_misc; | |
1962 | } | |
1963 | ||
1964 | err = sock_register(&vsock_family_ops); | |
1965 | if (err) { | |
1966 | pr_err("could not register af_vsock (%d) address family: %d\n", | |
1967 | AF_VSOCK, err); | |
1968 | goto err_unregister_proto; | |
1969 | } | |
1970 | ||
1971 | mutex_unlock(&vsock_register_mutex); | |
1972 | return 0; | |
1973 | ||
1974 | err_unregister_proto: | |
1975 | proto_unregister(&vsock_proto); | |
1976 | err_deregister_misc: | |
1977 | misc_deregister(&vsock_device); | |
1978 | err_reset_transport: | |
1979 | transport = NULL; | |
1980 | err_busy: | |
1981 | mutex_unlock(&vsock_register_mutex); | |
1982 | return err; | |
1983 | } | |
1984 | EXPORT_SYMBOL_GPL(__vsock_core_init); | |
1985 | ||
1986 | void vsock_core_exit(void) | |
1987 | { | |
1988 | mutex_lock(&vsock_register_mutex); | |
1989 | ||
1990 | misc_deregister(&vsock_device); | |
1991 | sock_unregister(AF_VSOCK); | |
1992 | proto_unregister(&vsock_proto); | |
1993 | ||
1994 | /* We do not want the assignment below re-ordered. */ | |
1995 | mb(); | |
1996 | transport = NULL; | |
1997 | ||
1998 | mutex_unlock(&vsock_register_mutex); | |
1999 | } | |
2000 | EXPORT_SYMBOL_GPL(vsock_core_exit); | |
2001 | ||
2002 | const struct vsock_transport *vsock_core_get_transport(void) | |
2003 | { | |
2004 | /* vsock_register_mutex not taken since only the transport uses this | |
2005 | * function and only while registered. | |
2006 | */ | |
2007 | return transport; | |
2008 | } | |
2009 | EXPORT_SYMBOL_GPL(vsock_core_get_transport); | |
2010 | ||
2011 | static void __exit vsock_exit(void) | |
2012 | { | |
2013 | /* Do nothing. This function makes this module removable. */ | |
2014 | } | |
2015 | ||
2016 | module_init(vsock_init_tables); | |
2017 | module_exit(vsock_exit); | |
2018 | ||
2019 | MODULE_AUTHOR("VMware, Inc."); | |
2020 | MODULE_DESCRIPTION("VMware Virtual Socket Family"); | |
2021 | MODULE_VERSION("1.0.2.0-k"); | |
2022 | MODULE_LICENSE("GPL v2"); |