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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 | |
3b4477d2 | 39 | * implementation because they are in the TCP_LISTEN state. When a |
ea3803c1 SH |
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. | |
d021c344 AK |
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 | * | |
4192f672 SH |
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 | * | |
d021c344 AK |
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. | |
3b4477d2 SH |
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 | |
d021c344 AK |
94 | */ |
95 | ||
96 | #include <linux/types.h> | |
d021c344 AK |
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> | |
174cd4b1 | 102 | #include <linux/sched/signal.h> |
d021c344 AK |
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> | |
8236b08c | 110 | #include <linux/random.h> |
d021c344 AK |
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> | |
82a54d0e | 119 | #include <net/af_vsock.h> |
d021c344 AK |
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 | ||
d021c344 AK |
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 | |
a49dd9dc | 164 | * mods with VSOCK_HASH_SIZE to ensure this. |
d021c344 | 165 | */ |
d021c344 AK |
166 | #define MAX_PORT_RETRIES 24 |
167 | ||
a49dd9dc | 168 | #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) |
d021c344 AK |
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) \ | |
a49dd9dc | 174 | (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) |
d021c344 AK |
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 | ||
44f20980 SH |
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); | |
d021c344 | 186 | |
b3a6dfe8 AH |
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 | ||
c1eef220 | 199 | static int __init vsock_init_tables(void) |
d021c344 AK |
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]); | |
c1eef220 | 208 | return 0; |
d021c344 AK |
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) | |
990454b5 | 242 | if (addr->svm_port == vsk->local_addr.svm_port) |
d021c344 AK |
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) { | |
990454b5 RG |
255 | if (vsock_addr_equals_addr(src, &vsk->remote_addr) && |
256 | dst->svm_port == vsk->local_addr.svm_port) { | |
d021c344 AK |
257 | return sk_vsock(vsk); |
258 | } | |
259 | } | |
260 | ||
261 | return NULL; | |
262 | } | |
263 | ||
d021c344 AK |
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 | __vsock_remove_bound(vsk); | |
286 | spin_unlock_bh(&vsock_table_lock); | |
287 | } | |
288 | EXPORT_SYMBOL_GPL(vsock_remove_bound); | |
289 | ||
290 | void vsock_remove_connected(struct vsock_sock *vsk) | |
291 | { | |
292 | spin_lock_bh(&vsock_table_lock); | |
293 | __vsock_remove_connected(vsk); | |
294 | spin_unlock_bh(&vsock_table_lock); | |
295 | } | |
296 | EXPORT_SYMBOL_GPL(vsock_remove_connected); | |
297 | ||
298 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) | |
299 | { | |
300 | struct sock *sk; | |
301 | ||
302 | spin_lock_bh(&vsock_table_lock); | |
303 | sk = __vsock_find_bound_socket(addr); | |
304 | if (sk) | |
305 | sock_hold(sk); | |
306 | ||
307 | spin_unlock_bh(&vsock_table_lock); | |
308 | ||
309 | return sk; | |
310 | } | |
311 | EXPORT_SYMBOL_GPL(vsock_find_bound_socket); | |
312 | ||
313 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, | |
314 | struct sockaddr_vm *dst) | |
315 | { | |
316 | struct sock *sk; | |
317 | ||
318 | spin_lock_bh(&vsock_table_lock); | |
319 | sk = __vsock_find_connected_socket(src, dst); | |
320 | if (sk) | |
321 | sock_hold(sk); | |
322 | ||
323 | spin_unlock_bh(&vsock_table_lock); | |
324 | ||
325 | return sk; | |
326 | } | |
327 | EXPORT_SYMBOL_GPL(vsock_find_connected_socket); | |
328 | ||
329 | static bool vsock_in_bound_table(struct vsock_sock *vsk) | |
330 | { | |
331 | bool ret; | |
332 | ||
333 | spin_lock_bh(&vsock_table_lock); | |
334 | ret = __vsock_in_bound_table(vsk); | |
335 | spin_unlock_bh(&vsock_table_lock); | |
336 | ||
337 | return ret; | |
338 | } | |
339 | ||
340 | static bool vsock_in_connected_table(struct vsock_sock *vsk) | |
341 | { | |
342 | bool ret; | |
343 | ||
344 | spin_lock_bh(&vsock_table_lock); | |
345 | ret = __vsock_in_connected_table(vsk); | |
346 | spin_unlock_bh(&vsock_table_lock); | |
347 | ||
348 | return ret; | |
349 | } | |
350 | ||
6773b7dc SH |
351 | void vsock_remove_sock(struct vsock_sock *vsk) |
352 | { | |
353 | if (vsock_in_bound_table(vsk)) | |
354 | vsock_remove_bound(vsk); | |
355 | ||
356 | if (vsock_in_connected_table(vsk)) | |
357 | vsock_remove_connected(vsk); | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(vsock_remove_sock); | |
360 | ||
d021c344 AK |
361 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) |
362 | { | |
363 | int i; | |
364 | ||
365 | spin_lock_bh(&vsock_table_lock); | |
366 | ||
367 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { | |
368 | struct vsock_sock *vsk; | |
369 | list_for_each_entry(vsk, &vsock_connected_table[i], | |
d9af2d67 | 370 | connected_table) |
d021c344 AK |
371 | fn(sk_vsock(vsk)); |
372 | } | |
373 | ||
374 | spin_unlock_bh(&vsock_table_lock); | |
375 | } | |
376 | EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); | |
377 | ||
378 | void vsock_add_pending(struct sock *listener, struct sock *pending) | |
379 | { | |
380 | struct vsock_sock *vlistener; | |
381 | struct vsock_sock *vpending; | |
382 | ||
383 | vlistener = vsock_sk(listener); | |
384 | vpending = vsock_sk(pending); | |
385 | ||
386 | sock_hold(pending); | |
387 | sock_hold(listener); | |
388 | list_add_tail(&vpending->pending_links, &vlistener->pending_links); | |
389 | } | |
390 | EXPORT_SYMBOL_GPL(vsock_add_pending); | |
391 | ||
392 | void vsock_remove_pending(struct sock *listener, struct sock *pending) | |
393 | { | |
394 | struct vsock_sock *vpending = vsock_sk(pending); | |
395 | ||
396 | list_del_init(&vpending->pending_links); | |
397 | sock_put(listener); | |
398 | sock_put(pending); | |
399 | } | |
400 | EXPORT_SYMBOL_GPL(vsock_remove_pending); | |
401 | ||
402 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected) | |
403 | { | |
404 | struct vsock_sock *vlistener; | |
405 | struct vsock_sock *vconnected; | |
406 | ||
407 | vlistener = vsock_sk(listener); | |
408 | vconnected = vsock_sk(connected); | |
409 | ||
410 | sock_hold(connected); | |
411 | sock_hold(listener); | |
412 | list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); | |
413 | } | |
414 | EXPORT_SYMBOL_GPL(vsock_enqueue_accept); | |
415 | ||
416 | static struct sock *vsock_dequeue_accept(struct sock *listener) | |
417 | { | |
418 | struct vsock_sock *vlistener; | |
419 | struct vsock_sock *vconnected; | |
420 | ||
421 | vlistener = vsock_sk(listener); | |
422 | ||
423 | if (list_empty(&vlistener->accept_queue)) | |
424 | return NULL; | |
425 | ||
426 | vconnected = list_entry(vlistener->accept_queue.next, | |
427 | struct vsock_sock, accept_queue); | |
428 | ||
429 | list_del_init(&vconnected->accept_queue); | |
430 | sock_put(listener); | |
431 | /* The caller will need a reference on the connected socket so we let | |
432 | * it call sock_put(). | |
433 | */ | |
434 | ||
435 | return sk_vsock(vconnected); | |
436 | } | |
437 | ||
438 | static bool vsock_is_accept_queue_empty(struct sock *sk) | |
439 | { | |
440 | struct vsock_sock *vsk = vsock_sk(sk); | |
441 | return list_empty(&vsk->accept_queue); | |
442 | } | |
443 | ||
444 | static bool vsock_is_pending(struct sock *sk) | |
445 | { | |
446 | struct vsock_sock *vsk = vsock_sk(sk); | |
447 | return !list_empty(&vsk->pending_links); | |
448 | } | |
449 | ||
450 | static int vsock_send_shutdown(struct sock *sk, int mode) | |
451 | { | |
452 | return transport->shutdown(vsock_sk(sk), mode); | |
453 | } | |
454 | ||
455f05ec | 455 | static void vsock_pending_work(struct work_struct *work) |
d021c344 AK |
456 | { |
457 | struct sock *sk; | |
458 | struct sock *listener; | |
459 | struct vsock_sock *vsk; | |
460 | bool cleanup; | |
461 | ||
455f05ec | 462 | vsk = container_of(work, struct vsock_sock, pending_work.work); |
d021c344 AK |
463 | sk = sk_vsock(vsk); |
464 | listener = vsk->listener; | |
465 | cleanup = true; | |
466 | ||
467 | lock_sock(listener); | |
4192f672 | 468 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
d021c344 AK |
469 | |
470 | if (vsock_is_pending(sk)) { | |
471 | vsock_remove_pending(listener, sk); | |
1190cfdb JH |
472 | |
473 | listener->sk_ack_backlog--; | |
d021c344 AK |
474 | } else if (!vsk->rejected) { |
475 | /* We are not on the pending list and accept() did not reject | |
476 | * us, so we must have been accepted by our user process. We | |
477 | * just need to drop our references to the sockets and be on | |
478 | * our way. | |
479 | */ | |
480 | cleanup = false; | |
481 | goto out; | |
482 | } | |
483 | ||
d021c344 AK |
484 | /* We need to remove ourself from the global connected sockets list so |
485 | * incoming packets can't find this socket, and to reduce the reference | |
486 | * count. | |
487 | */ | |
488 | if (vsock_in_connected_table(vsk)) | |
489 | vsock_remove_connected(vsk); | |
490 | ||
3b4477d2 | 491 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
492 | |
493 | out: | |
494 | release_sock(sk); | |
495 | release_sock(listener); | |
496 | if (cleanup) | |
497 | sock_put(sk); | |
498 | ||
499 | sock_put(sk); | |
500 | sock_put(listener); | |
501 | } | |
d021c344 AK |
502 | |
503 | /**** SOCKET OPERATIONS ****/ | |
504 | ||
505 | static int __vsock_bind_stream(struct vsock_sock *vsk, | |
506 | struct sockaddr_vm *addr) | |
507 | { | |
8236b08c | 508 | static u32 port = 0; |
d021c344 AK |
509 | struct sockaddr_vm new_addr; |
510 | ||
8236b08c LW |
511 | if (!port) |
512 | port = LAST_RESERVED_PORT + 1 + | |
513 | prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); | |
514 | ||
d021c344 AK |
515 | vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); |
516 | ||
517 | if (addr->svm_port == VMADDR_PORT_ANY) { | |
518 | bool found = false; | |
519 | unsigned int i; | |
520 | ||
521 | for (i = 0; i < MAX_PORT_RETRIES; i++) { | |
522 | if (port <= LAST_RESERVED_PORT) | |
523 | port = LAST_RESERVED_PORT + 1; | |
524 | ||
525 | new_addr.svm_port = port++; | |
526 | ||
527 | if (!__vsock_find_bound_socket(&new_addr)) { | |
528 | found = true; | |
529 | break; | |
530 | } | |
531 | } | |
532 | ||
533 | if (!found) | |
534 | return -EADDRNOTAVAIL; | |
535 | } else { | |
536 | /* If port is in reserved range, ensure caller | |
537 | * has necessary privileges. | |
538 | */ | |
539 | if (addr->svm_port <= LAST_RESERVED_PORT && | |
540 | !capable(CAP_NET_BIND_SERVICE)) { | |
541 | return -EACCES; | |
542 | } | |
543 | ||
544 | if (__vsock_find_bound_socket(&new_addr)) | |
545 | return -EADDRINUSE; | |
546 | } | |
547 | ||
548 | vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); | |
549 | ||
550 | /* Remove stream sockets from the unbound list and add them to the hash | |
551 | * table for easy lookup by its address. The unbound list is simply an | |
552 | * extra entry at the end of the hash table, a trick used by AF_UNIX. | |
553 | */ | |
554 | __vsock_remove_bound(vsk); | |
555 | __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | static int __vsock_bind_dgram(struct vsock_sock *vsk, | |
561 | struct sockaddr_vm *addr) | |
562 | { | |
563 | return transport->dgram_bind(vsk, addr); | |
564 | } | |
565 | ||
566 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) | |
567 | { | |
568 | struct vsock_sock *vsk = vsock_sk(sk); | |
569 | u32 cid; | |
570 | int retval; | |
571 | ||
572 | /* First ensure this socket isn't already bound. */ | |
573 | if (vsock_addr_bound(&vsk->local_addr)) | |
574 | return -EINVAL; | |
575 | ||
576 | /* Now bind to the provided address or select appropriate values if | |
577 | * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that | |
578 | * like AF_INET prevents binding to a non-local IP address (in most | |
579 | * cases), we only allow binding to the local CID. | |
580 | */ | |
581 | cid = transport->get_local_cid(); | |
582 | if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) | |
583 | return -EADDRNOTAVAIL; | |
584 | ||
585 | switch (sk->sk_socket->type) { | |
586 | case SOCK_STREAM: | |
587 | spin_lock_bh(&vsock_table_lock); | |
588 | retval = __vsock_bind_stream(vsk, addr); | |
589 | spin_unlock_bh(&vsock_table_lock); | |
590 | break; | |
591 | ||
592 | case SOCK_DGRAM: | |
593 | retval = __vsock_bind_dgram(vsk, addr); | |
594 | break; | |
595 | ||
596 | default: | |
597 | retval = -EINVAL; | |
598 | break; | |
599 | } | |
600 | ||
601 | return retval; | |
602 | } | |
603 | ||
455f05ec CW |
604 | static void vsock_connect_timeout(struct work_struct *work); |
605 | ||
d021c344 AK |
606 | struct sock *__vsock_create(struct net *net, |
607 | struct socket *sock, | |
608 | struct sock *parent, | |
609 | gfp_t priority, | |
11aa9c28 EB |
610 | unsigned short type, |
611 | int kern) | |
d021c344 AK |
612 | { |
613 | struct sock *sk; | |
614 | struct vsock_sock *psk; | |
615 | struct vsock_sock *vsk; | |
616 | ||
11aa9c28 | 617 | sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); |
d021c344 AK |
618 | if (!sk) |
619 | return NULL; | |
620 | ||
621 | sock_init_data(sock, sk); | |
622 | ||
623 | /* sk->sk_type is normally set in sock_init_data, but only if sock is | |
624 | * non-NULL. We make sure that our sockets always have a type by | |
625 | * setting it here if needed. | |
626 | */ | |
627 | if (!sock) | |
628 | sk->sk_type = type; | |
629 | ||
630 | vsk = vsock_sk(sk); | |
631 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
632 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
633 | ||
634 | sk->sk_destruct = vsock_sk_destruct; | |
635 | sk->sk_backlog_rcv = vsock_queue_rcv_skb; | |
d021c344 AK |
636 | sock_reset_flag(sk, SOCK_DONE); |
637 | ||
638 | INIT_LIST_HEAD(&vsk->bound_table); | |
639 | INIT_LIST_HEAD(&vsk->connected_table); | |
640 | vsk->listener = NULL; | |
641 | INIT_LIST_HEAD(&vsk->pending_links); | |
642 | INIT_LIST_HEAD(&vsk->accept_queue); | |
643 | vsk->rejected = false; | |
644 | vsk->sent_request = false; | |
645 | vsk->ignore_connecting_rst = false; | |
646 | vsk->peer_shutdown = 0; | |
455f05ec CW |
647 | INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); |
648 | INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); | |
d021c344 AK |
649 | |
650 | psk = parent ? vsock_sk(parent) : NULL; | |
651 | if (parent) { | |
652 | vsk->trusted = psk->trusted; | |
653 | vsk->owner = get_cred(psk->owner); | |
654 | vsk->connect_timeout = psk->connect_timeout; | |
655 | } else { | |
656 | vsk->trusted = capable(CAP_NET_ADMIN); | |
657 | vsk->owner = get_current_cred(); | |
658 | vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
659 | } | |
660 | ||
661 | if (transport->init(vsk, psk) < 0) { | |
662 | sk_free(sk); | |
663 | return NULL; | |
664 | } | |
665 | ||
666 | if (sock) | |
667 | vsock_insert_unbound(vsk); | |
668 | ||
669 | return sk; | |
670 | } | |
671 | EXPORT_SYMBOL_GPL(__vsock_create); | |
672 | ||
673 | static void __vsock_release(struct sock *sk) | |
674 | { | |
675 | if (sk) { | |
676 | struct sk_buff *skb; | |
677 | struct sock *pending; | |
678 | struct vsock_sock *vsk; | |
679 | ||
680 | vsk = vsock_sk(sk); | |
681 | pending = NULL; /* Compiler warning. */ | |
682 | ||
d021c344 AK |
683 | transport->release(vsk); |
684 | ||
685 | lock_sock(sk); | |
686 | sock_orphan(sk); | |
687 | sk->sk_shutdown = SHUTDOWN_MASK; | |
688 | ||
689 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) | |
690 | kfree_skb(skb); | |
691 | ||
692 | /* Clean up any sockets that never were accepted. */ | |
693 | while ((pending = vsock_dequeue_accept(sk)) != NULL) { | |
694 | __vsock_release(pending); | |
695 | sock_put(pending); | |
696 | } | |
697 | ||
698 | release_sock(sk); | |
699 | sock_put(sk); | |
700 | } | |
701 | } | |
702 | ||
703 | static void vsock_sk_destruct(struct sock *sk) | |
704 | { | |
705 | struct vsock_sock *vsk = vsock_sk(sk); | |
706 | ||
707 | transport->destruct(vsk); | |
708 | ||
709 | /* When clearing these addresses, there's no need to set the family and | |
710 | * possibly register the address family with the kernel. | |
711 | */ | |
712 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
713 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
714 | ||
715 | put_cred(vsk->owner); | |
716 | } | |
717 | ||
718 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
719 | { | |
720 | int err; | |
721 | ||
722 | err = sock_queue_rcv_skb(sk, skb); | |
723 | if (err) | |
724 | kfree_skb(skb); | |
725 | ||
726 | return err; | |
727 | } | |
728 | ||
729 | s64 vsock_stream_has_data(struct vsock_sock *vsk) | |
730 | { | |
731 | return transport->stream_has_data(vsk); | |
732 | } | |
733 | EXPORT_SYMBOL_GPL(vsock_stream_has_data); | |
734 | ||
735 | s64 vsock_stream_has_space(struct vsock_sock *vsk) | |
736 | { | |
737 | return transport->stream_has_space(vsk); | |
738 | } | |
739 | EXPORT_SYMBOL_GPL(vsock_stream_has_space); | |
740 | ||
741 | static int vsock_release(struct socket *sock) | |
742 | { | |
743 | __vsock_release(sock->sk); | |
744 | sock->sk = NULL; | |
745 | sock->state = SS_FREE; | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
750 | static int | |
751 | vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
752 | { | |
753 | int err; | |
754 | struct sock *sk; | |
755 | struct sockaddr_vm *vm_addr; | |
756 | ||
757 | sk = sock->sk; | |
758 | ||
759 | if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) | |
760 | return -EINVAL; | |
761 | ||
762 | lock_sock(sk); | |
763 | err = __vsock_bind(sk, vm_addr); | |
764 | release_sock(sk); | |
765 | ||
766 | return err; | |
767 | } | |
768 | ||
769 | static int vsock_getname(struct socket *sock, | |
9b2c45d4 | 770 | struct sockaddr *addr, int peer) |
d021c344 AK |
771 | { |
772 | int err; | |
773 | struct sock *sk; | |
774 | struct vsock_sock *vsk; | |
775 | struct sockaddr_vm *vm_addr; | |
776 | ||
777 | sk = sock->sk; | |
778 | vsk = vsock_sk(sk); | |
779 | err = 0; | |
780 | ||
781 | lock_sock(sk); | |
782 | ||
783 | if (peer) { | |
784 | if (sock->state != SS_CONNECTED) { | |
785 | err = -ENOTCONN; | |
786 | goto out; | |
787 | } | |
788 | vm_addr = &vsk->remote_addr; | |
789 | } else { | |
790 | vm_addr = &vsk->local_addr; | |
791 | } | |
792 | ||
793 | if (!vm_addr) { | |
794 | err = -EINVAL; | |
795 | goto out; | |
796 | } | |
797 | ||
798 | /* sys_getsockname() and sys_getpeername() pass us a | |
799 | * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately | |
800 | * that macro is defined in socket.c instead of .h, so we hardcode its | |
801 | * value here. | |
802 | */ | |
803 | BUILD_BUG_ON(sizeof(*vm_addr) > 128); | |
804 | memcpy(addr, vm_addr, sizeof(*vm_addr)); | |
9b2c45d4 | 805 | err = sizeof(*vm_addr); |
d021c344 AK |
806 | |
807 | out: | |
808 | release_sock(sk); | |
809 | return err; | |
810 | } | |
811 | ||
812 | static int vsock_shutdown(struct socket *sock, int mode) | |
813 | { | |
814 | int err; | |
815 | struct sock *sk; | |
816 | ||
817 | /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses | |
818 | * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode | |
819 | * here like the other address families do. Note also that the | |
820 | * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), | |
821 | * which is what we want. | |
822 | */ | |
823 | mode++; | |
824 | ||
825 | if ((mode & ~SHUTDOWN_MASK) || !mode) | |
826 | return -EINVAL; | |
827 | ||
828 | /* If this is a STREAM socket and it is not connected then bail out | |
829 | * immediately. If it is a DGRAM socket then we must first kick the | |
830 | * socket so that it wakes up from any sleeping calls, for example | |
831 | * recv(), and then afterwards return the error. | |
832 | */ | |
833 | ||
834 | sk = sock->sk; | |
835 | if (sock->state == SS_UNCONNECTED) { | |
836 | err = -ENOTCONN; | |
837 | if (sk->sk_type == SOCK_STREAM) | |
838 | return err; | |
839 | } else { | |
840 | sock->state = SS_DISCONNECTING; | |
841 | err = 0; | |
842 | } | |
843 | ||
844 | /* Receive and send shutdowns are treated alike. */ | |
845 | mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); | |
846 | if (mode) { | |
847 | lock_sock(sk); | |
848 | sk->sk_shutdown |= mode; | |
849 | sk->sk_state_change(sk); | |
850 | release_sock(sk); | |
851 | ||
852 | if (sk->sk_type == SOCK_STREAM) { | |
853 | sock_reset_flag(sk, SOCK_DONE); | |
854 | vsock_send_shutdown(sk, mode); | |
855 | } | |
856 | } | |
857 | ||
858 | return err; | |
859 | } | |
860 | ||
a11e1d43 LT |
861 | static __poll_t vsock_poll(struct file *file, struct socket *sock, |
862 | poll_table *wait) | |
d021c344 | 863 | { |
a11e1d43 LT |
864 | struct sock *sk; |
865 | __poll_t mask; | |
866 | struct vsock_sock *vsk; | |
867 | ||
868 | sk = sock->sk; | |
869 | vsk = vsock_sk(sk); | |
870 | ||
871 | poll_wait(file, sk_sleep(sk), wait); | |
872 | mask = 0; | |
d021c344 AK |
873 | |
874 | if (sk->sk_err) | |
875 | /* Signify that there has been an error on this socket. */ | |
a9a08845 | 876 | mask |= EPOLLERR; |
d021c344 AK |
877 | |
878 | /* INET sockets treat local write shutdown and peer write shutdown as a | |
a9a08845 | 879 | * case of EPOLLHUP set. |
d021c344 AK |
880 | */ |
881 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || | |
882 | ((sk->sk_shutdown & SEND_SHUTDOWN) && | |
883 | (vsk->peer_shutdown & SEND_SHUTDOWN))) { | |
a9a08845 | 884 | mask |= EPOLLHUP; |
d021c344 AK |
885 | } |
886 | ||
887 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
888 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 889 | mask |= EPOLLRDHUP; |
d021c344 AK |
890 | } |
891 | ||
892 | if (sock->type == SOCK_DGRAM) { | |
893 | /* For datagram sockets we can read if there is something in | |
894 | * the queue and write as long as the socket isn't shutdown for | |
895 | * sending. | |
896 | */ | |
897 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
898 | (sk->sk_shutdown & RCV_SHUTDOWN)) { | |
a9a08845 | 899 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
900 | } |
901 | ||
902 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
a9a08845 | 903 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
d021c344 AK |
904 | |
905 | } else if (sock->type == SOCK_STREAM) { | |
906 | lock_sock(sk); | |
907 | ||
908 | /* Listening sockets that have connections in their accept | |
909 | * queue can be read. | |
910 | */ | |
3b4477d2 | 911 | if (sk->sk_state == TCP_LISTEN |
d021c344 | 912 | && !vsock_is_accept_queue_empty(sk)) |
a9a08845 | 913 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
914 | |
915 | /* If there is something in the queue then we can read. */ | |
916 | if (transport->stream_is_active(vsk) && | |
917 | !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
918 | bool data_ready_now = false; | |
919 | int ret = transport->notify_poll_in( | |
920 | vsk, 1, &data_ready_now); | |
921 | if (ret < 0) { | |
a9a08845 | 922 | mask |= EPOLLERR; |
d021c344 AK |
923 | } else { |
924 | if (data_ready_now) | |
a9a08845 | 925 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
926 | |
927 | } | |
928 | } | |
929 | ||
930 | /* Sockets whose connections have been closed, reset, or | |
931 | * terminated should also be considered read, and we check the | |
932 | * shutdown flag for that. | |
933 | */ | |
934 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
935 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 936 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
937 | } |
938 | ||
939 | /* Connected sockets that can produce data can be written. */ | |
3b4477d2 | 940 | if (sk->sk_state == TCP_ESTABLISHED) { |
d021c344 AK |
941 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
942 | bool space_avail_now = false; | |
943 | int ret = transport->notify_poll_out( | |
944 | vsk, 1, &space_avail_now); | |
945 | if (ret < 0) { | |
a9a08845 | 946 | mask |= EPOLLERR; |
d021c344 AK |
947 | } else { |
948 | if (space_avail_now) | |
a9a08845 | 949 | /* Remove EPOLLWRBAND since INET |
d021c344 AK |
950 | * sockets are not setting it. |
951 | */ | |
a9a08845 | 952 | mask |= EPOLLOUT | EPOLLWRNORM; |
d021c344 AK |
953 | |
954 | } | |
955 | } | |
956 | } | |
957 | ||
958 | /* Simulate INET socket poll behaviors, which sets | |
a9a08845 | 959 | * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, |
d021c344 AK |
960 | * but local send is not shutdown. |
961 | */ | |
ba3169fc | 962 | if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { |
d021c344 | 963 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) |
a9a08845 | 964 | mask |= EPOLLOUT | EPOLLWRNORM; |
d021c344 AK |
965 | |
966 | } | |
967 | ||
968 | release_sock(sk); | |
969 | } | |
970 | ||
971 | return mask; | |
972 | } | |
973 | ||
1b784140 YX |
974 | static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, |
975 | size_t len) | |
d021c344 AK |
976 | { |
977 | int err; | |
978 | struct sock *sk; | |
979 | struct vsock_sock *vsk; | |
980 | struct sockaddr_vm *remote_addr; | |
981 | ||
982 | if (msg->msg_flags & MSG_OOB) | |
983 | return -EOPNOTSUPP; | |
984 | ||
985 | /* For now, MSG_DONTWAIT is always assumed... */ | |
986 | err = 0; | |
987 | sk = sock->sk; | |
988 | vsk = vsock_sk(sk); | |
989 | ||
990 | lock_sock(sk); | |
991 | ||
b3a6dfe8 AH |
992 | err = vsock_auto_bind(vsk); |
993 | if (err) | |
994 | goto out; | |
d021c344 | 995 | |
d021c344 AK |
996 | |
997 | /* If the provided message contains an address, use that. Otherwise | |
998 | * fall back on the socket's remote handle (if it has been connected). | |
999 | */ | |
1000 | if (msg->msg_name && | |
1001 | vsock_addr_cast(msg->msg_name, msg->msg_namelen, | |
1002 | &remote_addr) == 0) { | |
1003 | /* Ensure this address is of the right type and is a valid | |
1004 | * destination. | |
1005 | */ | |
1006 | ||
1007 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
1008 | remote_addr->svm_cid = transport->get_local_cid(); | |
1009 | ||
1010 | if (!vsock_addr_bound(remote_addr)) { | |
1011 | err = -EINVAL; | |
1012 | goto out; | |
1013 | } | |
1014 | } else if (sock->state == SS_CONNECTED) { | |
1015 | remote_addr = &vsk->remote_addr; | |
1016 | ||
1017 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
1018 | remote_addr->svm_cid = transport->get_local_cid(); | |
1019 | ||
1020 | /* XXX Should connect() or this function ensure remote_addr is | |
1021 | * bound? | |
1022 | */ | |
1023 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1024 | err = -EINVAL; | |
1025 | goto out; | |
1026 | } | |
1027 | } else { | |
1028 | err = -EINVAL; | |
1029 | goto out; | |
1030 | } | |
1031 | ||
1032 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1033 | remote_addr->svm_port)) { | |
1034 | err = -EINVAL; | |
1035 | goto out; | |
1036 | } | |
1037 | ||
0f7db23a | 1038 | err = transport->dgram_enqueue(vsk, remote_addr, msg, len); |
d021c344 AK |
1039 | |
1040 | out: | |
1041 | release_sock(sk); | |
1042 | return err; | |
1043 | } | |
1044 | ||
1045 | static int vsock_dgram_connect(struct socket *sock, | |
1046 | struct sockaddr *addr, int addr_len, int flags) | |
1047 | { | |
1048 | int err; | |
1049 | struct sock *sk; | |
1050 | struct vsock_sock *vsk; | |
1051 | struct sockaddr_vm *remote_addr; | |
1052 | ||
1053 | sk = sock->sk; | |
1054 | vsk = vsock_sk(sk); | |
1055 | ||
1056 | err = vsock_addr_cast(addr, addr_len, &remote_addr); | |
1057 | if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { | |
1058 | lock_sock(sk); | |
1059 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, | |
1060 | VMADDR_PORT_ANY); | |
1061 | sock->state = SS_UNCONNECTED; | |
1062 | release_sock(sk); | |
1063 | return 0; | |
1064 | } else if (err != 0) | |
1065 | return -EINVAL; | |
1066 | ||
1067 | lock_sock(sk); | |
1068 | ||
b3a6dfe8 AH |
1069 | err = vsock_auto_bind(vsk); |
1070 | if (err) | |
1071 | goto out; | |
d021c344 AK |
1072 | |
1073 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1074 | remote_addr->svm_port)) { | |
1075 | err = -EINVAL; | |
1076 | goto out; | |
1077 | } | |
1078 | ||
1079 | memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); | |
1080 | sock->state = SS_CONNECTED; | |
1081 | ||
1082 | out: | |
1083 | release_sock(sk); | |
1084 | return err; | |
1085 | } | |
1086 | ||
1b784140 YX |
1087 | static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, |
1088 | size_t len, int flags) | |
d021c344 | 1089 | { |
1b784140 | 1090 | return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags); |
d021c344 AK |
1091 | } |
1092 | ||
1093 | static const struct proto_ops vsock_dgram_ops = { | |
1094 | .family = PF_VSOCK, | |
1095 | .owner = THIS_MODULE, | |
1096 | .release = vsock_release, | |
1097 | .bind = vsock_bind, | |
1098 | .connect = vsock_dgram_connect, | |
1099 | .socketpair = sock_no_socketpair, | |
1100 | .accept = sock_no_accept, | |
1101 | .getname = vsock_getname, | |
a11e1d43 | 1102 | .poll = vsock_poll, |
d021c344 AK |
1103 | .ioctl = sock_no_ioctl, |
1104 | .listen = sock_no_listen, | |
1105 | .shutdown = vsock_shutdown, | |
1106 | .setsockopt = sock_no_setsockopt, | |
1107 | .getsockopt = sock_no_getsockopt, | |
1108 | .sendmsg = vsock_dgram_sendmsg, | |
1109 | .recvmsg = vsock_dgram_recvmsg, | |
1110 | .mmap = sock_no_mmap, | |
1111 | .sendpage = sock_no_sendpage, | |
1112 | }; | |
1113 | ||
380feae0 PT |
1114 | static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) |
1115 | { | |
1116 | if (!transport->cancel_pkt) | |
1117 | return -EOPNOTSUPP; | |
1118 | ||
1119 | return transport->cancel_pkt(vsk); | |
1120 | } | |
1121 | ||
d021c344 AK |
1122 | static void vsock_connect_timeout(struct work_struct *work) |
1123 | { | |
1124 | struct sock *sk; | |
1125 | struct vsock_sock *vsk; | |
380feae0 | 1126 | int cancel = 0; |
d021c344 | 1127 | |
455f05ec | 1128 | vsk = container_of(work, struct vsock_sock, connect_work.work); |
d021c344 AK |
1129 | sk = sk_vsock(vsk); |
1130 | ||
1131 | lock_sock(sk); | |
3b4477d2 | 1132 | if (sk->sk_state == TCP_SYN_SENT && |
d021c344 | 1133 | (sk->sk_shutdown != SHUTDOWN_MASK)) { |
3b4477d2 | 1134 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
1135 | sk->sk_err = ETIMEDOUT; |
1136 | sk->sk_error_report(sk); | |
380feae0 | 1137 | cancel = 1; |
d021c344 AK |
1138 | } |
1139 | release_sock(sk); | |
380feae0 PT |
1140 | if (cancel) |
1141 | vsock_transport_cancel_pkt(vsk); | |
d021c344 AK |
1142 | |
1143 | sock_put(sk); | |
1144 | } | |
1145 | ||
1146 | static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, | |
1147 | int addr_len, int flags) | |
1148 | { | |
1149 | int err; | |
1150 | struct sock *sk; | |
1151 | struct vsock_sock *vsk; | |
1152 | struct sockaddr_vm *remote_addr; | |
1153 | long timeout; | |
1154 | DEFINE_WAIT(wait); | |
1155 | ||
1156 | err = 0; | |
1157 | sk = sock->sk; | |
1158 | vsk = vsock_sk(sk); | |
1159 | ||
1160 | lock_sock(sk); | |
1161 | ||
1162 | /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ | |
1163 | switch (sock->state) { | |
1164 | case SS_CONNECTED: | |
1165 | err = -EISCONN; | |
1166 | goto out; | |
1167 | case SS_DISCONNECTING: | |
1168 | err = -EINVAL; | |
1169 | goto out; | |
1170 | case SS_CONNECTING: | |
1171 | /* This continues on so we can move sock into the SS_CONNECTED | |
1172 | * state once the connection has completed (at which point err | |
1173 | * will be set to zero also). Otherwise, we will either wait | |
1174 | * for the connection or return -EALREADY should this be a | |
1175 | * non-blocking call. | |
1176 | */ | |
1177 | err = -EALREADY; | |
1178 | break; | |
1179 | default: | |
3b4477d2 | 1180 | if ((sk->sk_state == TCP_LISTEN) || |
d021c344 AK |
1181 | vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { |
1182 | err = -EINVAL; | |
1183 | goto out; | |
1184 | } | |
1185 | ||
1186 | /* The hypervisor and well-known contexts do not have socket | |
1187 | * endpoints. | |
1188 | */ | |
1189 | if (!transport->stream_allow(remote_addr->svm_cid, | |
1190 | remote_addr->svm_port)) { | |
1191 | err = -ENETUNREACH; | |
1192 | goto out; | |
1193 | } | |
1194 | ||
1195 | /* Set the remote address that we are connecting to. */ | |
1196 | memcpy(&vsk->remote_addr, remote_addr, | |
1197 | sizeof(vsk->remote_addr)); | |
1198 | ||
b3a6dfe8 AH |
1199 | err = vsock_auto_bind(vsk); |
1200 | if (err) | |
1201 | goto out; | |
d021c344 | 1202 | |
3b4477d2 | 1203 | sk->sk_state = TCP_SYN_SENT; |
d021c344 AK |
1204 | |
1205 | err = transport->connect(vsk); | |
1206 | if (err < 0) | |
1207 | goto out; | |
1208 | ||
1209 | /* Mark sock as connecting and set the error code to in | |
1210 | * progress in case this is a non-blocking connect. | |
1211 | */ | |
1212 | sock->state = SS_CONNECTING; | |
1213 | err = -EINPROGRESS; | |
1214 | } | |
1215 | ||
1216 | /* The receive path will handle all communication until we are able to | |
1217 | * enter the connected state. Here we wait for the connection to be | |
1218 | * completed or a notification of an error. | |
1219 | */ | |
1220 | timeout = vsk->connect_timeout; | |
1221 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1222 | ||
3b4477d2 | 1223 | while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { |
d021c344 AK |
1224 | if (flags & O_NONBLOCK) { |
1225 | /* If we're not going to block, we schedule a timeout | |
1226 | * function to generate a timeout on the connection | |
1227 | * attempt, in case the peer doesn't respond in a | |
1228 | * timely manner. We hold on to the socket until the | |
1229 | * timeout fires. | |
1230 | */ | |
1231 | sock_hold(sk); | |
455f05ec | 1232 | schedule_delayed_work(&vsk->connect_work, timeout); |
d021c344 AK |
1233 | |
1234 | /* Skip ahead to preserve error code set above. */ | |
1235 | goto out_wait; | |
1236 | } | |
1237 | ||
1238 | release_sock(sk); | |
1239 | timeout = schedule_timeout(timeout); | |
1240 | lock_sock(sk); | |
1241 | ||
1242 | if (signal_pending(current)) { | |
1243 | err = sock_intr_errno(timeout); | |
3b4477d2 | 1244 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 | 1245 | sock->state = SS_UNCONNECTED; |
380feae0 | 1246 | vsock_transport_cancel_pkt(vsk); |
f7f9b5e7 | 1247 | goto out_wait; |
d021c344 AK |
1248 | } else if (timeout == 0) { |
1249 | err = -ETIMEDOUT; | |
3b4477d2 | 1250 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 | 1251 | sock->state = SS_UNCONNECTED; |
380feae0 | 1252 | vsock_transport_cancel_pkt(vsk); |
f7f9b5e7 | 1253 | goto out_wait; |
d021c344 AK |
1254 | } |
1255 | ||
1256 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1257 | } | |
1258 | ||
1259 | if (sk->sk_err) { | |
1260 | err = -sk->sk_err; | |
3b4477d2 | 1261 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 CI |
1262 | sock->state = SS_UNCONNECTED; |
1263 | } else { | |
d021c344 | 1264 | err = 0; |
f7f9b5e7 | 1265 | } |
d021c344 AK |
1266 | |
1267 | out_wait: | |
1268 | finish_wait(sk_sleep(sk), &wait); | |
1269 | out: | |
1270 | release_sock(sk); | |
1271 | return err; | |
d021c344 AK |
1272 | } |
1273 | ||
cdfbabfb DH |
1274 | static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, |
1275 | bool kern) | |
d021c344 AK |
1276 | { |
1277 | struct sock *listener; | |
1278 | int err; | |
1279 | struct sock *connected; | |
1280 | struct vsock_sock *vconnected; | |
1281 | long timeout; | |
1282 | DEFINE_WAIT(wait); | |
1283 | ||
1284 | err = 0; | |
1285 | listener = sock->sk; | |
1286 | ||
1287 | lock_sock(listener); | |
1288 | ||
1289 | if (sock->type != SOCK_STREAM) { | |
1290 | err = -EOPNOTSUPP; | |
1291 | goto out; | |
1292 | } | |
1293 | ||
3b4477d2 | 1294 | if (listener->sk_state != TCP_LISTEN) { |
d021c344 AK |
1295 | err = -EINVAL; |
1296 | goto out; | |
1297 | } | |
1298 | ||
1299 | /* Wait for children sockets to appear; these are the new sockets | |
1300 | * created upon connection establishment. | |
1301 | */ | |
1302 | timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); | |
1303 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1304 | ||
1305 | while ((connected = vsock_dequeue_accept(listener)) == NULL && | |
1306 | listener->sk_err == 0) { | |
1307 | release_sock(listener); | |
1308 | timeout = schedule_timeout(timeout); | |
f7f9b5e7 | 1309 | finish_wait(sk_sleep(listener), &wait); |
d021c344 AK |
1310 | lock_sock(listener); |
1311 | ||
1312 | if (signal_pending(current)) { | |
1313 | err = sock_intr_errno(timeout); | |
f7f9b5e7 | 1314 | goto out; |
d021c344 AK |
1315 | } else if (timeout == 0) { |
1316 | err = -EAGAIN; | |
f7f9b5e7 | 1317 | goto out; |
d021c344 AK |
1318 | } |
1319 | ||
1320 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1321 | } | |
f7f9b5e7 | 1322 | finish_wait(sk_sleep(listener), &wait); |
d021c344 AK |
1323 | |
1324 | if (listener->sk_err) | |
1325 | err = -listener->sk_err; | |
1326 | ||
1327 | if (connected) { | |
1328 | listener->sk_ack_backlog--; | |
1329 | ||
4192f672 | 1330 | lock_sock_nested(connected, SINGLE_DEPTH_NESTING); |
d021c344 AK |
1331 | vconnected = vsock_sk(connected); |
1332 | ||
1333 | /* If the listener socket has received an error, then we should | |
1334 | * reject this socket and return. Note that we simply mark the | |
1335 | * socket rejected, drop our reference, and let the cleanup | |
1336 | * function handle the cleanup; the fact that we found it in | |
1337 | * the listener's accept queue guarantees that the cleanup | |
1338 | * function hasn't run yet. | |
1339 | */ | |
1340 | if (err) { | |
1341 | vconnected->rejected = true; | |
f7f9b5e7 CI |
1342 | } else { |
1343 | newsock->state = SS_CONNECTED; | |
1344 | sock_graft(connected, newsock); | |
d021c344 AK |
1345 | } |
1346 | ||
d021c344 AK |
1347 | release_sock(connected); |
1348 | sock_put(connected); | |
1349 | } | |
1350 | ||
d021c344 AK |
1351 | out: |
1352 | release_sock(listener); | |
1353 | return err; | |
1354 | } | |
1355 | ||
1356 | static int vsock_listen(struct socket *sock, int backlog) | |
1357 | { | |
1358 | int err; | |
1359 | struct sock *sk; | |
1360 | struct vsock_sock *vsk; | |
1361 | ||
1362 | sk = sock->sk; | |
1363 | ||
1364 | lock_sock(sk); | |
1365 | ||
1366 | if (sock->type != SOCK_STREAM) { | |
1367 | err = -EOPNOTSUPP; | |
1368 | goto out; | |
1369 | } | |
1370 | ||
1371 | if (sock->state != SS_UNCONNECTED) { | |
1372 | err = -EINVAL; | |
1373 | goto out; | |
1374 | } | |
1375 | ||
1376 | vsk = vsock_sk(sk); | |
1377 | ||
1378 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1379 | err = -EINVAL; | |
1380 | goto out; | |
1381 | } | |
1382 | ||
1383 | sk->sk_max_ack_backlog = backlog; | |
3b4477d2 | 1384 | sk->sk_state = TCP_LISTEN; |
d021c344 AK |
1385 | |
1386 | err = 0; | |
1387 | ||
1388 | out: | |
1389 | release_sock(sk); | |
1390 | return err; | |
1391 | } | |
1392 | ||
1393 | static int vsock_stream_setsockopt(struct socket *sock, | |
1394 | int level, | |
1395 | int optname, | |
1396 | char __user *optval, | |
1397 | unsigned int optlen) | |
1398 | { | |
1399 | int err; | |
1400 | struct sock *sk; | |
1401 | struct vsock_sock *vsk; | |
1402 | u64 val; | |
1403 | ||
1404 | if (level != AF_VSOCK) | |
1405 | return -ENOPROTOOPT; | |
1406 | ||
1407 | #define COPY_IN(_v) \ | |
1408 | do { \ | |
1409 | if (optlen < sizeof(_v)) { \ | |
1410 | err = -EINVAL; \ | |
1411 | goto exit; \ | |
1412 | } \ | |
1413 | if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ | |
1414 | err = -EFAULT; \ | |
1415 | goto exit; \ | |
1416 | } \ | |
1417 | } while (0) | |
1418 | ||
1419 | err = 0; | |
1420 | sk = sock->sk; | |
1421 | vsk = vsock_sk(sk); | |
1422 | ||
1423 | lock_sock(sk); | |
1424 | ||
1425 | switch (optname) { | |
1426 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1427 | COPY_IN(val); | |
1428 | transport->set_buffer_size(vsk, val); | |
1429 | break; | |
1430 | ||
1431 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1432 | COPY_IN(val); | |
1433 | transport->set_max_buffer_size(vsk, val); | |
1434 | break; | |
1435 | ||
1436 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1437 | COPY_IN(val); | |
1438 | transport->set_min_buffer_size(vsk, val); | |
1439 | break; | |
1440 | ||
1441 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
1442 | struct timeval tv; | |
1443 | COPY_IN(tv); | |
1444 | if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && | |
1445 | tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { | |
1446 | vsk->connect_timeout = tv.tv_sec * HZ + | |
1447 | DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); | |
1448 | if (vsk->connect_timeout == 0) | |
1449 | vsk->connect_timeout = | |
1450 | VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
1451 | ||
1452 | } else { | |
1453 | err = -ERANGE; | |
1454 | } | |
1455 | break; | |
1456 | } | |
1457 | ||
1458 | default: | |
1459 | err = -ENOPROTOOPT; | |
1460 | break; | |
1461 | } | |
1462 | ||
1463 | #undef COPY_IN | |
1464 | ||
1465 | exit: | |
1466 | release_sock(sk); | |
1467 | return err; | |
1468 | } | |
1469 | ||
1470 | static int vsock_stream_getsockopt(struct socket *sock, | |
1471 | int level, int optname, | |
1472 | char __user *optval, | |
1473 | int __user *optlen) | |
1474 | { | |
1475 | int err; | |
1476 | int len; | |
1477 | struct sock *sk; | |
1478 | struct vsock_sock *vsk; | |
1479 | u64 val; | |
1480 | ||
1481 | if (level != AF_VSOCK) | |
1482 | return -ENOPROTOOPT; | |
1483 | ||
1484 | err = get_user(len, optlen); | |
1485 | if (err != 0) | |
1486 | return err; | |
1487 | ||
1488 | #define COPY_OUT(_v) \ | |
1489 | do { \ | |
1490 | if (len < sizeof(_v)) \ | |
1491 | return -EINVAL; \ | |
1492 | \ | |
1493 | len = sizeof(_v); \ | |
1494 | if (copy_to_user(optval, &_v, len) != 0) \ | |
1495 | return -EFAULT; \ | |
1496 | \ | |
1497 | } while (0) | |
1498 | ||
1499 | err = 0; | |
1500 | sk = sock->sk; | |
1501 | vsk = vsock_sk(sk); | |
1502 | ||
1503 | switch (optname) { | |
1504 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1505 | val = transport->get_buffer_size(vsk); | |
1506 | COPY_OUT(val); | |
1507 | break; | |
1508 | ||
1509 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1510 | val = transport->get_max_buffer_size(vsk); | |
1511 | COPY_OUT(val); | |
1512 | break; | |
1513 | ||
1514 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1515 | val = transport->get_min_buffer_size(vsk); | |
1516 | COPY_OUT(val); | |
1517 | break; | |
1518 | ||
1519 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
1520 | struct timeval tv; | |
1521 | tv.tv_sec = vsk->connect_timeout / HZ; | |
1522 | tv.tv_usec = | |
1523 | (vsk->connect_timeout - | |
1524 | tv.tv_sec * HZ) * (1000000 / HZ); | |
1525 | COPY_OUT(tv); | |
1526 | break; | |
1527 | } | |
1528 | default: | |
1529 | return -ENOPROTOOPT; | |
1530 | } | |
1531 | ||
1532 | err = put_user(len, optlen); | |
1533 | if (err != 0) | |
1534 | return -EFAULT; | |
1535 | ||
1536 | #undef COPY_OUT | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | ||
1b784140 YX |
1541 | static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, |
1542 | size_t len) | |
d021c344 AK |
1543 | { |
1544 | struct sock *sk; | |
1545 | struct vsock_sock *vsk; | |
1546 | ssize_t total_written; | |
1547 | long timeout; | |
1548 | int err; | |
1549 | struct vsock_transport_send_notify_data send_data; | |
499fde66 | 1550 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
d021c344 AK |
1551 | |
1552 | sk = sock->sk; | |
1553 | vsk = vsock_sk(sk); | |
1554 | total_written = 0; | |
1555 | err = 0; | |
1556 | ||
1557 | if (msg->msg_flags & MSG_OOB) | |
1558 | return -EOPNOTSUPP; | |
1559 | ||
1560 | lock_sock(sk); | |
1561 | ||
1562 | /* Callers should not provide a destination with stream sockets. */ | |
1563 | if (msg->msg_namelen) { | |
3b4477d2 | 1564 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; |
d021c344 AK |
1565 | goto out; |
1566 | } | |
1567 | ||
1568 | /* Send data only if both sides are not shutdown in the direction. */ | |
1569 | if (sk->sk_shutdown & SEND_SHUTDOWN || | |
1570 | vsk->peer_shutdown & RCV_SHUTDOWN) { | |
1571 | err = -EPIPE; | |
1572 | goto out; | |
1573 | } | |
1574 | ||
3b4477d2 | 1575 | if (sk->sk_state != TCP_ESTABLISHED || |
d021c344 AK |
1576 | !vsock_addr_bound(&vsk->local_addr)) { |
1577 | err = -ENOTCONN; | |
1578 | goto out; | |
1579 | } | |
1580 | ||
1581 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1582 | err = -EDESTADDRREQ; | |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | /* Wait for room in the produce queue to enqueue our user's data. */ | |
1587 | timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1588 | ||
1589 | err = transport->notify_send_init(vsk, &send_data); | |
1590 | if (err < 0) | |
1591 | goto out; | |
1592 | ||
d021c344 AK |
1593 | while (total_written < len) { |
1594 | ssize_t written; | |
1595 | ||
499fde66 | 1596 | add_wait_queue(sk_sleep(sk), &wait); |
d021c344 AK |
1597 | while (vsock_stream_has_space(vsk) == 0 && |
1598 | sk->sk_err == 0 && | |
1599 | !(sk->sk_shutdown & SEND_SHUTDOWN) && | |
1600 | !(vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1601 | ||
1602 | /* Don't wait for non-blocking sockets. */ | |
1603 | if (timeout == 0) { | |
1604 | err = -EAGAIN; | |
499fde66 | 1605 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1606 | goto out_err; |
d021c344 AK |
1607 | } |
1608 | ||
1609 | err = transport->notify_send_pre_block(vsk, &send_data); | |
f7f9b5e7 | 1610 | if (err < 0) { |
499fde66 | 1611 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 CI |
1612 | goto out_err; |
1613 | } | |
d021c344 AK |
1614 | |
1615 | release_sock(sk); | |
499fde66 | 1616 | timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); |
d021c344 AK |
1617 | lock_sock(sk); |
1618 | if (signal_pending(current)) { | |
1619 | err = sock_intr_errno(timeout); | |
499fde66 | 1620 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1621 | goto out_err; |
d021c344 AK |
1622 | } else if (timeout == 0) { |
1623 | err = -EAGAIN; | |
499fde66 | 1624 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1625 | goto out_err; |
d021c344 | 1626 | } |
d021c344 | 1627 | } |
499fde66 | 1628 | remove_wait_queue(sk_sleep(sk), &wait); |
d021c344 AK |
1629 | |
1630 | /* These checks occur both as part of and after the loop | |
1631 | * conditional since we need to check before and after | |
1632 | * sleeping. | |
1633 | */ | |
1634 | if (sk->sk_err) { | |
1635 | err = -sk->sk_err; | |
f7f9b5e7 | 1636 | goto out_err; |
d021c344 AK |
1637 | } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || |
1638 | (vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1639 | err = -EPIPE; | |
f7f9b5e7 | 1640 | goto out_err; |
d021c344 AK |
1641 | } |
1642 | ||
1643 | err = transport->notify_send_pre_enqueue(vsk, &send_data); | |
1644 | if (err < 0) | |
f7f9b5e7 | 1645 | goto out_err; |
d021c344 AK |
1646 | |
1647 | /* Note that enqueue will only write as many bytes as are free | |
1648 | * in the produce queue, so we don't need to ensure len is | |
1649 | * smaller than the queue size. It is the caller's | |
1650 | * responsibility to check how many bytes we were able to send. | |
1651 | */ | |
1652 | ||
1653 | written = transport->stream_enqueue( | |
0f7db23a | 1654 | vsk, msg, |
d021c344 AK |
1655 | len - total_written); |
1656 | if (written < 0) { | |
1657 | err = -ENOMEM; | |
f7f9b5e7 | 1658 | goto out_err; |
d021c344 AK |
1659 | } |
1660 | ||
1661 | total_written += written; | |
1662 | ||
1663 | err = transport->notify_send_post_enqueue( | |
1664 | vsk, written, &send_data); | |
1665 | if (err < 0) | |
f7f9b5e7 | 1666 | goto out_err; |
d021c344 AK |
1667 | |
1668 | } | |
1669 | ||
f7f9b5e7 | 1670 | out_err: |
d021c344 AK |
1671 | if (total_written > 0) |
1672 | err = total_written; | |
d021c344 AK |
1673 | out: |
1674 | release_sock(sk); | |
1675 | return err; | |
1676 | } | |
1677 | ||
1678 | ||
1679 | static int | |
1b784140 YX |
1680 | vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
1681 | int flags) | |
d021c344 AK |
1682 | { |
1683 | struct sock *sk; | |
1684 | struct vsock_sock *vsk; | |
1685 | int err; | |
1686 | size_t target; | |
1687 | ssize_t copied; | |
1688 | long timeout; | |
1689 | struct vsock_transport_recv_notify_data recv_data; | |
1690 | ||
1691 | DEFINE_WAIT(wait); | |
1692 | ||
1693 | sk = sock->sk; | |
1694 | vsk = vsock_sk(sk); | |
1695 | err = 0; | |
1696 | ||
1697 | lock_sock(sk); | |
1698 | ||
3b4477d2 | 1699 | if (sk->sk_state != TCP_ESTABLISHED) { |
d021c344 AK |
1700 | /* Recvmsg is supposed to return 0 if a peer performs an |
1701 | * orderly shutdown. Differentiate between that case and when a | |
1702 | * peer has not connected or a local shutdown occured with the | |
1703 | * SOCK_DONE flag. | |
1704 | */ | |
1705 | if (sock_flag(sk, SOCK_DONE)) | |
1706 | err = 0; | |
1707 | else | |
1708 | err = -ENOTCONN; | |
1709 | ||
1710 | goto out; | |
1711 | } | |
1712 | ||
1713 | if (flags & MSG_OOB) { | |
1714 | err = -EOPNOTSUPP; | |
1715 | goto out; | |
1716 | } | |
1717 | ||
1718 | /* We don't check peer_shutdown flag here since peer may actually shut | |
1719 | * down, but there can be data in the queue that a local socket can | |
1720 | * receive. | |
1721 | */ | |
1722 | if (sk->sk_shutdown & RCV_SHUTDOWN) { | |
1723 | err = 0; | |
1724 | goto out; | |
1725 | } | |
1726 | ||
1727 | /* It is valid on Linux to pass in a zero-length receive buffer. This | |
1728 | * is not an error. We may as well bail out now. | |
1729 | */ | |
1730 | if (!len) { | |
1731 | err = 0; | |
1732 | goto out; | |
1733 | } | |
1734 | ||
1735 | /* We must not copy less than target bytes into the user's buffer | |
1736 | * before returning successfully, so we wait for the consume queue to | |
1737 | * have that much data to consume before dequeueing. Note that this | |
1738 | * makes it impossible to handle cases where target is greater than the | |
1739 | * queue size. | |
1740 | */ | |
1741 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1742 | if (target >= transport->stream_rcvhiwat(vsk)) { | |
1743 | err = -ENOMEM; | |
1744 | goto out; | |
1745 | } | |
1746 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1747 | copied = 0; | |
1748 | ||
1749 | err = transport->notify_recv_init(vsk, target, &recv_data); | |
1750 | if (err < 0) | |
1751 | goto out; | |
1752 | ||
d021c344 AK |
1753 | |
1754 | while (1) { | |
f7f9b5e7 | 1755 | s64 ready; |
d021c344 | 1756 | |
f7f9b5e7 CI |
1757 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1758 | ready = vsock_stream_has_data(vsk); | |
d021c344 | 1759 | |
f7f9b5e7 CI |
1760 | if (ready == 0) { |
1761 | if (sk->sk_err != 0 || | |
1762 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1763 | (vsk->peer_shutdown & SEND_SHUTDOWN)) { | |
1764 | finish_wait(sk_sleep(sk), &wait); | |
1765 | break; | |
1766 | } | |
1767 | /* Don't wait for non-blocking sockets. */ | |
1768 | if (timeout == 0) { | |
1769 | err = -EAGAIN; | |
1770 | finish_wait(sk_sleep(sk), &wait); | |
1771 | break; | |
1772 | } | |
1773 | ||
1774 | err = transport->notify_recv_pre_block( | |
1775 | vsk, target, &recv_data); | |
1776 | if (err < 0) { | |
1777 | finish_wait(sk_sleep(sk), &wait); | |
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 | finish_wait(sk_sleep(sk), &wait); | |
1787 | break; | |
1788 | } else if (timeout == 0) { | |
1789 | err = -EAGAIN; | |
1790 | finish_wait(sk_sleep(sk), &wait); | |
1791 | break; | |
1792 | } | |
1793 | } else { | |
d021c344 AK |
1794 | ssize_t read; |
1795 | ||
f7f9b5e7 CI |
1796 | finish_wait(sk_sleep(sk), &wait); |
1797 | ||
1798 | if (ready < 0) { | |
1799 | /* Invalid queue pair content. XXX This should | |
1800 | * be changed to a connection reset in a later | |
1801 | * change. | |
1802 | */ | |
1803 | ||
1804 | err = -ENOMEM; | |
1805 | goto out; | |
1806 | } | |
1807 | ||
d021c344 AK |
1808 | err = transport->notify_recv_pre_dequeue( |
1809 | vsk, target, &recv_data); | |
1810 | if (err < 0) | |
1811 | break; | |
1812 | ||
1813 | read = transport->stream_dequeue( | |
0f7db23a | 1814 | vsk, msg, |
d021c344 AK |
1815 | len - copied, flags); |
1816 | if (read < 0) { | |
1817 | err = -ENOMEM; | |
1818 | break; | |
1819 | } | |
1820 | ||
1821 | copied += read; | |
1822 | ||
1823 | err = transport->notify_recv_post_dequeue( | |
1824 | vsk, target, read, | |
1825 | !(flags & MSG_PEEK), &recv_data); | |
1826 | if (err < 0) | |
f7f9b5e7 | 1827 | goto out; |
d021c344 AK |
1828 | |
1829 | if (read >= target || flags & MSG_PEEK) | |
1830 | break; | |
1831 | ||
1832 | target -= read; | |
d021c344 AK |
1833 | } |
1834 | } | |
1835 | ||
1836 | if (sk->sk_err) | |
1837 | err = -sk->sk_err; | |
1838 | else if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1839 | err = 0; | |
1840 | ||
dedc58e0 | 1841 | if (copied > 0) |
d021c344 | 1842 | err = copied; |
d021c344 | 1843 | |
d021c344 AK |
1844 | out: |
1845 | release_sock(sk); | |
1846 | return err; | |
1847 | } | |
1848 | ||
1849 | static const struct proto_ops vsock_stream_ops = { | |
1850 | .family = PF_VSOCK, | |
1851 | .owner = THIS_MODULE, | |
1852 | .release = vsock_release, | |
1853 | .bind = vsock_bind, | |
1854 | .connect = vsock_stream_connect, | |
1855 | .socketpair = sock_no_socketpair, | |
1856 | .accept = vsock_accept, | |
1857 | .getname = vsock_getname, | |
a11e1d43 | 1858 | .poll = vsock_poll, |
d021c344 AK |
1859 | .ioctl = sock_no_ioctl, |
1860 | .listen = vsock_listen, | |
1861 | .shutdown = vsock_shutdown, | |
1862 | .setsockopt = vsock_stream_setsockopt, | |
1863 | .getsockopt = vsock_stream_getsockopt, | |
1864 | .sendmsg = vsock_stream_sendmsg, | |
1865 | .recvmsg = vsock_stream_recvmsg, | |
1866 | .mmap = sock_no_mmap, | |
1867 | .sendpage = sock_no_sendpage, | |
1868 | }; | |
1869 | ||
1870 | static int vsock_create(struct net *net, struct socket *sock, | |
1871 | int protocol, int kern) | |
1872 | { | |
1873 | if (!sock) | |
1874 | return -EINVAL; | |
1875 | ||
6cf1c5fc | 1876 | if (protocol && protocol != PF_VSOCK) |
d021c344 AK |
1877 | return -EPROTONOSUPPORT; |
1878 | ||
1879 | switch (sock->type) { | |
1880 | case SOCK_DGRAM: | |
1881 | sock->ops = &vsock_dgram_ops; | |
1882 | break; | |
1883 | case SOCK_STREAM: | |
1884 | sock->ops = &vsock_stream_ops; | |
1885 | break; | |
1886 | default: | |
1887 | return -ESOCKTNOSUPPORT; | |
1888 | } | |
1889 | ||
1890 | sock->state = SS_UNCONNECTED; | |
1891 | ||
11aa9c28 | 1892 | return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM; |
d021c344 AK |
1893 | } |
1894 | ||
1895 | static const struct net_proto_family vsock_family_ops = { | |
1896 | .family = AF_VSOCK, | |
1897 | .create = vsock_create, | |
1898 | .owner = THIS_MODULE, | |
1899 | }; | |
1900 | ||
1901 | static long vsock_dev_do_ioctl(struct file *filp, | |
1902 | unsigned int cmd, void __user *ptr) | |
1903 | { | |
1904 | u32 __user *p = ptr; | |
1905 | int retval = 0; | |
1906 | ||
1907 | switch (cmd) { | |
1908 | case IOCTL_VM_SOCKETS_GET_LOCAL_CID: | |
1909 | if (put_user(transport->get_local_cid(), p) != 0) | |
1910 | retval = -EFAULT; | |
1911 | break; | |
1912 | ||
1913 | default: | |
1914 | pr_err("Unknown ioctl %d\n", cmd); | |
1915 | retval = -EINVAL; | |
1916 | } | |
1917 | ||
1918 | return retval; | |
1919 | } | |
1920 | ||
1921 | static long vsock_dev_ioctl(struct file *filp, | |
1922 | unsigned int cmd, unsigned long arg) | |
1923 | { | |
1924 | return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); | |
1925 | } | |
1926 | ||
1927 | #ifdef CONFIG_COMPAT | |
1928 | static long vsock_dev_compat_ioctl(struct file *filp, | |
1929 | unsigned int cmd, unsigned long arg) | |
1930 | { | |
1931 | return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); | |
1932 | } | |
1933 | #endif | |
1934 | ||
1935 | static const struct file_operations vsock_device_ops = { | |
1936 | .owner = THIS_MODULE, | |
1937 | .unlocked_ioctl = vsock_dev_ioctl, | |
1938 | #ifdef CONFIG_COMPAT | |
1939 | .compat_ioctl = vsock_dev_compat_ioctl, | |
1940 | #endif | |
1941 | .open = nonseekable_open, | |
1942 | }; | |
1943 | ||
1944 | static struct miscdevice vsock_device = { | |
1945 | .name = "vsock", | |
d021c344 AK |
1946 | .fops = &vsock_device_ops, |
1947 | }; | |
1948 | ||
2c4a336e | 1949 | int __vsock_core_init(const struct vsock_transport *t, struct module *owner) |
d021c344 | 1950 | { |
2c4a336e AK |
1951 | int err = mutex_lock_interruptible(&vsock_register_mutex); |
1952 | ||
1953 | if (err) | |
1954 | return err; | |
1955 | ||
1956 | if (transport) { | |
1957 | err = -EBUSY; | |
1958 | goto err_busy; | |
1959 | } | |
1960 | ||
1961 | /* Transport must be the owner of the protocol so that it can't | |
1962 | * unload while there are open sockets. | |
1963 | */ | |
1964 | vsock_proto.owner = owner; | |
1965 | transport = t; | |
d021c344 | 1966 | |
6ad0b2f7 | 1967 | vsock_device.minor = MISC_DYNAMIC_MINOR; |
d021c344 AK |
1968 | err = misc_register(&vsock_device); |
1969 | if (err) { | |
1970 | pr_err("Failed to register misc device\n"); | |
f6a835bb | 1971 | goto err_reset_transport; |
d021c344 AK |
1972 | } |
1973 | ||
1974 | err = proto_register(&vsock_proto, 1); /* we want our slab */ | |
1975 | if (err) { | |
1976 | pr_err("Cannot register vsock protocol\n"); | |
f6a835bb | 1977 | goto err_deregister_misc; |
d021c344 AK |
1978 | } |
1979 | ||
1980 | err = sock_register(&vsock_family_ops); | |
1981 | if (err) { | |
1982 | pr_err("could not register af_vsock (%d) address family: %d\n", | |
1983 | AF_VSOCK, err); | |
1984 | goto err_unregister_proto; | |
1985 | } | |
1986 | ||
2c4a336e | 1987 | mutex_unlock(&vsock_register_mutex); |
d021c344 AK |
1988 | return 0; |
1989 | ||
1990 | err_unregister_proto: | |
1991 | proto_unregister(&vsock_proto); | |
f6a835bb | 1992 | err_deregister_misc: |
d021c344 | 1993 | misc_deregister(&vsock_device); |
f6a835bb | 1994 | err_reset_transport: |
2c4a336e AK |
1995 | transport = NULL; |
1996 | err_busy: | |
d021c344 | 1997 | mutex_unlock(&vsock_register_mutex); |
2c4a336e | 1998 | return err; |
d021c344 | 1999 | } |
2c4a336e | 2000 | EXPORT_SYMBOL_GPL(__vsock_core_init); |
d021c344 AK |
2001 | |
2002 | void vsock_core_exit(void) | |
2003 | { | |
2004 | mutex_lock(&vsock_register_mutex); | |
2005 | ||
2006 | misc_deregister(&vsock_device); | |
2007 | sock_unregister(AF_VSOCK); | |
2008 | proto_unregister(&vsock_proto); | |
2009 | ||
2010 | /* We do not want the assignment below re-ordered. */ | |
2011 | mb(); | |
2012 | transport = NULL; | |
2013 | ||
2014 | mutex_unlock(&vsock_register_mutex); | |
2015 | } | |
2016 | EXPORT_SYMBOL_GPL(vsock_core_exit); | |
2017 | ||
0b01aeb3 SH |
2018 | const struct vsock_transport *vsock_core_get_transport(void) |
2019 | { | |
2020 | /* vsock_register_mutex not taken since only the transport uses this | |
2021 | * function and only while registered. | |
2022 | */ | |
2023 | return transport; | |
2024 | } | |
2025 | EXPORT_SYMBOL_GPL(vsock_core_get_transport); | |
2026 | ||
05e489b1 SH |
2027 | static void __exit vsock_exit(void) |
2028 | { | |
2029 | /* Do nothing. This function makes this module removable. */ | |
2030 | } | |
2031 | ||
c1eef220 | 2032 | module_init(vsock_init_tables); |
05e489b1 | 2033 | module_exit(vsock_exit); |
c1eef220 | 2034 | |
d021c344 AK |
2035 | MODULE_AUTHOR("VMware, Inc."); |
2036 | MODULE_DESCRIPTION("VMware Virtual Socket Family"); | |
1190cfdb | 2037 | MODULE_VERSION("1.0.2.0-k"); |
d021c344 | 2038 | MODULE_LICENSE("GPL v2"); |