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685a6bf8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d021c344 AK |
2 | /* |
3 | * VMware vSockets Driver | |
4 | * | |
5 | * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. | |
d021c344 AK |
6 | */ |
7 | ||
8 | /* Implementation notes: | |
9 | * | |
10 | * - There are two kinds of sockets: those created by user action (such as | |
11 | * calling socket(2)) and those created by incoming connection request packets. | |
12 | * | |
13 | * - There are two "global" tables, one for bound sockets (sockets that have | |
14 | * specified an address that they are responsible for) and one for connected | |
15 | * sockets (sockets that have established a connection with another socket). | |
16 | * These tables are "global" in that all sockets on the system are placed | |
17 | * within them. - Note, though, that the bound table contains an extra entry | |
18 | * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in | |
19 | * that list. The bound table is used solely for lookup of sockets when packets | |
20 | * are received and that's not necessary for SOCK_DGRAM sockets since we create | |
21 | * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM | |
22 | * sockets out of the bound hash buckets will reduce the chance of collisions | |
23 | * when looking for SOCK_STREAM sockets and prevents us from having to check the | |
24 | * socket type in the hash table lookups. | |
25 | * | |
26 | * - Sockets created by user action will either be "client" sockets that | |
27 | * initiate a connection or "server" sockets that listen for connections; we do | |
28 | * not support simultaneous connects (two "client" sockets connecting). | |
29 | * | |
30 | * - "Server" sockets are referred to as listener sockets throughout this | |
3b4477d2 | 31 | * implementation because they are in the TCP_LISTEN state. When a |
ea3803c1 SH |
32 | * connection request is received (the second kind of socket mentioned above), |
33 | * we create a new socket and refer to it as a pending socket. These pending | |
34 | * sockets are placed on the pending connection list of the listener socket. | |
35 | * When future packets are received for the address the listener socket is | |
36 | * bound to, we check if the source of the packet is from one that has an | |
37 | * existing pending connection. If it does, we process the packet for the | |
38 | * pending socket. When that socket reaches the connected state, it is removed | |
39 | * from the listener socket's pending list and enqueued in the listener | |
40 | * socket's accept queue. Callers of accept(2) will accept connected sockets | |
41 | * from the listener socket's accept queue. If the socket cannot be accepted | |
42 | * for some reason then it is marked rejected. Once the connection is | |
43 | * accepted, it is owned by the user process and the responsibility for cleanup | |
44 | * falls with that user process. | |
d021c344 AK |
45 | * |
46 | * - It is possible that these pending sockets will never reach the connected | |
47 | * state; in fact, we may never receive another packet after the connection | |
48 | * request. Because of this, we must schedule a cleanup function to run in the | |
49 | * future, after some amount of time passes where a connection should have been | |
50 | * established. This function ensures that the socket is off all lists so it | |
51 | * cannot be retrieved, then drops all references to the socket so it is cleaned | |
52 | * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this | |
53 | * function will also cleanup rejected sockets, those that reach the connected | |
54 | * state but leave it before they have been accepted. | |
55 | * | |
4192f672 SH |
56 | * - Lock ordering for pending or accept queue sockets is: |
57 | * | |
58 | * lock_sock(listener); | |
59 | * lock_sock_nested(pending, SINGLE_DEPTH_NESTING); | |
60 | * | |
61 | * Using explicit nested locking keeps lockdep happy since normally only one | |
62 | * lock of a given class may be taken at a time. | |
63 | * | |
d021c344 AK |
64 | * - Sockets created by user action will be cleaned up when the user process |
65 | * calls close(2), causing our release implementation to be called. Our release | |
66 | * implementation will perform some cleanup then drop the last reference so our | |
67 | * sk_destruct implementation is invoked. Our sk_destruct implementation will | |
68 | * perform additional cleanup that's common for both types of sockets. | |
69 | * | |
70 | * - A socket's reference count is what ensures that the structure won't be | |
71 | * freed. Each entry in a list (such as the "global" bound and connected tables | |
72 | * and the listener socket's pending list and connected queue) ensures a | |
73 | * reference. When we defer work until process context and pass a socket as our | |
74 | * argument, we must ensure the reference count is increased to ensure the | |
75 | * socket isn't freed before the function is run; the deferred function will | |
76 | * then drop the reference. | |
3b4477d2 SH |
77 | * |
78 | * - sk->sk_state uses the TCP state constants because they are widely used by | |
79 | * other address families and exposed to userspace tools like ss(8): | |
80 | * | |
81 | * TCP_CLOSE - unconnected | |
82 | * TCP_SYN_SENT - connecting | |
83 | * TCP_ESTABLISHED - connected | |
84 | * TCP_CLOSING - disconnecting | |
85 | * TCP_LISTEN - listening | |
d021c344 AK |
86 | */ |
87 | ||
88 | #include <linux/types.h> | |
d021c344 AK |
89 | #include <linux/bitops.h> |
90 | #include <linux/cred.h> | |
91 | #include <linux/init.h> | |
92 | #include <linux/io.h> | |
93 | #include <linux/kernel.h> | |
174cd4b1 | 94 | #include <linux/sched/signal.h> |
d021c344 AK |
95 | #include <linux/kmod.h> |
96 | #include <linux/list.h> | |
97 | #include <linux/miscdevice.h> | |
98 | #include <linux/module.h> | |
99 | #include <linux/mutex.h> | |
100 | #include <linux/net.h> | |
101 | #include <linux/poll.h> | |
8236b08c | 102 | #include <linux/random.h> |
d021c344 AK |
103 | #include <linux/skbuff.h> |
104 | #include <linux/smp.h> | |
105 | #include <linux/socket.h> | |
106 | #include <linux/stddef.h> | |
107 | #include <linux/unistd.h> | |
108 | #include <linux/wait.h> | |
109 | #include <linux/workqueue.h> | |
110 | #include <net/sock.h> | |
82a54d0e | 111 | #include <net/af_vsock.h> |
d021c344 AK |
112 | |
113 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); | |
114 | static void vsock_sk_destruct(struct sock *sk); | |
115 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); | |
116 | ||
117 | /* Protocol family. */ | |
118 | static struct proto vsock_proto = { | |
119 | .name = "AF_VSOCK", | |
120 | .owner = THIS_MODULE, | |
121 | .obj_size = sizeof(struct vsock_sock), | |
122 | }; | |
123 | ||
124 | /* The default peer timeout indicates how long we will wait for a peer response | |
125 | * to a control message. | |
126 | */ | |
127 | #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) | |
128 | ||
d021c344 AK |
129 | static const struct vsock_transport *transport; |
130 | static DEFINE_MUTEX(vsock_register_mutex); | |
131 | ||
132 | /**** EXPORTS ****/ | |
133 | ||
134 | /* Get the ID of the local context. This is transport dependent. */ | |
135 | ||
136 | int vm_sockets_get_local_cid(void) | |
137 | { | |
138 | return transport->get_local_cid(); | |
139 | } | |
140 | EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid); | |
141 | ||
142 | /**** UTILS ****/ | |
143 | ||
144 | /* Each bound VSocket is stored in the bind hash table and each connected | |
145 | * VSocket is stored in the connected hash table. | |
146 | * | |
147 | * Unbound sockets are all put on the same list attached to the end of the hash | |
148 | * table (vsock_unbound_sockets). Bound sockets are added to the hash table in | |
149 | * the bucket that their local address hashes to (vsock_bound_sockets(addr) | |
150 | * represents the list that addr hashes to). | |
151 | * | |
152 | * Specifically, we initialize the vsock_bind_table array to a size of | |
153 | * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through | |
154 | * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and | |
155 | * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function | |
a49dd9dc | 156 | * mods with VSOCK_HASH_SIZE to ensure this. |
d021c344 | 157 | */ |
d021c344 AK |
158 | #define MAX_PORT_RETRIES 24 |
159 | ||
a49dd9dc | 160 | #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) |
d021c344 AK |
161 | #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) |
162 | #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) | |
163 | ||
164 | /* XXX This can probably be implemented in a better way. */ | |
165 | #define VSOCK_CONN_HASH(src, dst) \ | |
a49dd9dc | 166 | (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) |
d021c344 AK |
167 | #define vsock_connected_sockets(src, dst) \ |
168 | (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) | |
169 | #define vsock_connected_sockets_vsk(vsk) \ | |
170 | vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) | |
171 | ||
44f20980 SH |
172 | struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; |
173 | EXPORT_SYMBOL_GPL(vsock_bind_table); | |
174 | struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; | |
175 | EXPORT_SYMBOL_GPL(vsock_connected_table); | |
176 | DEFINE_SPINLOCK(vsock_table_lock); | |
177 | EXPORT_SYMBOL_GPL(vsock_table_lock); | |
d021c344 | 178 | |
b3a6dfe8 AH |
179 | /* Autobind this socket to the local address if necessary. */ |
180 | static int vsock_auto_bind(struct vsock_sock *vsk) | |
181 | { | |
182 | struct sock *sk = sk_vsock(vsk); | |
183 | struct sockaddr_vm local_addr; | |
184 | ||
185 | if (vsock_addr_bound(&vsk->local_addr)) | |
186 | return 0; | |
187 | vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
188 | return __vsock_bind(sk, &local_addr); | |
189 | } | |
190 | ||
c1eef220 | 191 | static int __init vsock_init_tables(void) |
d021c344 AK |
192 | { |
193 | int i; | |
194 | ||
195 | for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) | |
196 | INIT_LIST_HEAD(&vsock_bind_table[i]); | |
197 | ||
198 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) | |
199 | INIT_LIST_HEAD(&vsock_connected_table[i]); | |
c1eef220 | 200 | return 0; |
d021c344 AK |
201 | } |
202 | ||
203 | static void __vsock_insert_bound(struct list_head *list, | |
204 | struct vsock_sock *vsk) | |
205 | { | |
206 | sock_hold(&vsk->sk); | |
207 | list_add(&vsk->bound_table, list); | |
208 | } | |
209 | ||
210 | static void __vsock_insert_connected(struct list_head *list, | |
211 | struct vsock_sock *vsk) | |
212 | { | |
213 | sock_hold(&vsk->sk); | |
214 | list_add(&vsk->connected_table, list); | |
215 | } | |
216 | ||
217 | static void __vsock_remove_bound(struct vsock_sock *vsk) | |
218 | { | |
219 | list_del_init(&vsk->bound_table); | |
220 | sock_put(&vsk->sk); | |
221 | } | |
222 | ||
223 | static void __vsock_remove_connected(struct vsock_sock *vsk) | |
224 | { | |
225 | list_del_init(&vsk->connected_table); | |
226 | sock_put(&vsk->sk); | |
227 | } | |
228 | ||
229 | static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) | |
230 | { | |
231 | struct vsock_sock *vsk; | |
232 | ||
233 | list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) | |
990454b5 | 234 | if (addr->svm_port == vsk->local_addr.svm_port) |
d021c344 AK |
235 | return sk_vsock(vsk); |
236 | ||
237 | return NULL; | |
238 | } | |
239 | ||
240 | static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, | |
241 | struct sockaddr_vm *dst) | |
242 | { | |
243 | struct vsock_sock *vsk; | |
244 | ||
245 | list_for_each_entry(vsk, vsock_connected_sockets(src, dst), | |
246 | connected_table) { | |
990454b5 RG |
247 | if (vsock_addr_equals_addr(src, &vsk->remote_addr) && |
248 | dst->svm_port == vsk->local_addr.svm_port) { | |
d021c344 AK |
249 | return sk_vsock(vsk); |
250 | } | |
251 | } | |
252 | ||
253 | return NULL; | |
254 | } | |
255 | ||
d021c344 AK |
256 | static void vsock_insert_unbound(struct vsock_sock *vsk) |
257 | { | |
258 | spin_lock_bh(&vsock_table_lock); | |
259 | __vsock_insert_bound(vsock_unbound_sockets, vsk); | |
260 | spin_unlock_bh(&vsock_table_lock); | |
261 | } | |
262 | ||
263 | void vsock_insert_connected(struct vsock_sock *vsk) | |
264 | { | |
265 | struct list_head *list = vsock_connected_sockets( | |
266 | &vsk->remote_addr, &vsk->local_addr); | |
267 | ||
268 | spin_lock_bh(&vsock_table_lock); | |
269 | __vsock_insert_connected(list, vsk); | |
270 | spin_unlock_bh(&vsock_table_lock); | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(vsock_insert_connected); | |
273 | ||
274 | void vsock_remove_bound(struct vsock_sock *vsk) | |
275 | { | |
276 | spin_lock_bh(&vsock_table_lock); | |
d5afa82c SM |
277 | if (__vsock_in_bound_table(vsk)) |
278 | __vsock_remove_bound(vsk); | |
d021c344 AK |
279 | spin_unlock_bh(&vsock_table_lock); |
280 | } | |
281 | EXPORT_SYMBOL_GPL(vsock_remove_bound); | |
282 | ||
283 | void vsock_remove_connected(struct vsock_sock *vsk) | |
284 | { | |
285 | spin_lock_bh(&vsock_table_lock); | |
d5afa82c SM |
286 | if (__vsock_in_connected_table(vsk)) |
287 | __vsock_remove_connected(vsk); | |
d021c344 AK |
288 | spin_unlock_bh(&vsock_table_lock); |
289 | } | |
290 | EXPORT_SYMBOL_GPL(vsock_remove_connected); | |
291 | ||
292 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) | |
293 | { | |
294 | struct sock *sk; | |
295 | ||
296 | spin_lock_bh(&vsock_table_lock); | |
297 | sk = __vsock_find_bound_socket(addr); | |
298 | if (sk) | |
299 | sock_hold(sk); | |
300 | ||
301 | spin_unlock_bh(&vsock_table_lock); | |
302 | ||
303 | return sk; | |
304 | } | |
305 | EXPORT_SYMBOL_GPL(vsock_find_bound_socket); | |
306 | ||
307 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, | |
308 | struct sockaddr_vm *dst) | |
309 | { | |
310 | struct sock *sk; | |
311 | ||
312 | spin_lock_bh(&vsock_table_lock); | |
313 | sk = __vsock_find_connected_socket(src, dst); | |
314 | if (sk) | |
315 | sock_hold(sk); | |
316 | ||
317 | spin_unlock_bh(&vsock_table_lock); | |
318 | ||
319 | return sk; | |
320 | } | |
321 | EXPORT_SYMBOL_GPL(vsock_find_connected_socket); | |
322 | ||
6773b7dc SH |
323 | void vsock_remove_sock(struct vsock_sock *vsk) |
324 | { | |
d5afa82c SM |
325 | vsock_remove_bound(vsk); |
326 | vsock_remove_connected(vsk); | |
6773b7dc SH |
327 | } |
328 | EXPORT_SYMBOL_GPL(vsock_remove_sock); | |
329 | ||
d021c344 AK |
330 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) |
331 | { | |
332 | int i; | |
333 | ||
334 | spin_lock_bh(&vsock_table_lock); | |
335 | ||
336 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { | |
337 | struct vsock_sock *vsk; | |
338 | list_for_each_entry(vsk, &vsock_connected_table[i], | |
d9af2d67 | 339 | connected_table) |
d021c344 AK |
340 | fn(sk_vsock(vsk)); |
341 | } | |
342 | ||
343 | spin_unlock_bh(&vsock_table_lock); | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); | |
346 | ||
347 | void vsock_add_pending(struct sock *listener, struct sock *pending) | |
348 | { | |
349 | struct vsock_sock *vlistener; | |
350 | struct vsock_sock *vpending; | |
351 | ||
352 | vlistener = vsock_sk(listener); | |
353 | vpending = vsock_sk(pending); | |
354 | ||
355 | sock_hold(pending); | |
356 | sock_hold(listener); | |
357 | list_add_tail(&vpending->pending_links, &vlistener->pending_links); | |
358 | } | |
359 | EXPORT_SYMBOL_GPL(vsock_add_pending); | |
360 | ||
361 | void vsock_remove_pending(struct sock *listener, struct sock *pending) | |
362 | { | |
363 | struct vsock_sock *vpending = vsock_sk(pending); | |
364 | ||
365 | list_del_init(&vpending->pending_links); | |
366 | sock_put(listener); | |
367 | sock_put(pending); | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(vsock_remove_pending); | |
370 | ||
371 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected) | |
372 | { | |
373 | struct vsock_sock *vlistener; | |
374 | struct vsock_sock *vconnected; | |
375 | ||
376 | vlistener = vsock_sk(listener); | |
377 | vconnected = vsock_sk(connected); | |
378 | ||
379 | sock_hold(connected); | |
380 | sock_hold(listener); | |
381 | list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); | |
382 | } | |
383 | EXPORT_SYMBOL_GPL(vsock_enqueue_accept); | |
384 | ||
385 | static struct sock *vsock_dequeue_accept(struct sock *listener) | |
386 | { | |
387 | struct vsock_sock *vlistener; | |
388 | struct vsock_sock *vconnected; | |
389 | ||
390 | vlistener = vsock_sk(listener); | |
391 | ||
392 | if (list_empty(&vlistener->accept_queue)) | |
393 | return NULL; | |
394 | ||
395 | vconnected = list_entry(vlistener->accept_queue.next, | |
396 | struct vsock_sock, accept_queue); | |
397 | ||
398 | list_del_init(&vconnected->accept_queue); | |
399 | sock_put(listener); | |
400 | /* The caller will need a reference on the connected socket so we let | |
401 | * it call sock_put(). | |
402 | */ | |
403 | ||
404 | return sk_vsock(vconnected); | |
405 | } | |
406 | ||
407 | static bool vsock_is_accept_queue_empty(struct sock *sk) | |
408 | { | |
409 | struct vsock_sock *vsk = vsock_sk(sk); | |
410 | return list_empty(&vsk->accept_queue); | |
411 | } | |
412 | ||
413 | static bool vsock_is_pending(struct sock *sk) | |
414 | { | |
415 | struct vsock_sock *vsk = vsock_sk(sk); | |
416 | return !list_empty(&vsk->pending_links); | |
417 | } | |
418 | ||
419 | static int vsock_send_shutdown(struct sock *sk, int mode) | |
420 | { | |
421 | return transport->shutdown(vsock_sk(sk), mode); | |
422 | } | |
423 | ||
455f05ec | 424 | static void vsock_pending_work(struct work_struct *work) |
d021c344 AK |
425 | { |
426 | struct sock *sk; | |
427 | struct sock *listener; | |
428 | struct vsock_sock *vsk; | |
429 | bool cleanup; | |
430 | ||
455f05ec | 431 | vsk = container_of(work, struct vsock_sock, pending_work.work); |
d021c344 AK |
432 | sk = sk_vsock(vsk); |
433 | listener = vsk->listener; | |
434 | cleanup = true; | |
435 | ||
436 | lock_sock(listener); | |
4192f672 | 437 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
d021c344 AK |
438 | |
439 | if (vsock_is_pending(sk)) { | |
440 | vsock_remove_pending(listener, sk); | |
1190cfdb JH |
441 | |
442 | listener->sk_ack_backlog--; | |
d021c344 AK |
443 | } else if (!vsk->rejected) { |
444 | /* We are not on the pending list and accept() did not reject | |
445 | * us, so we must have been accepted by our user process. We | |
446 | * just need to drop our references to the sockets and be on | |
447 | * our way. | |
448 | */ | |
449 | cleanup = false; | |
450 | goto out; | |
451 | } | |
452 | ||
d021c344 AK |
453 | /* We need to remove ourself from the global connected sockets list so |
454 | * incoming packets can't find this socket, and to reduce the reference | |
455 | * count. | |
456 | */ | |
d5afa82c | 457 | vsock_remove_connected(vsk); |
d021c344 | 458 | |
3b4477d2 | 459 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
460 | |
461 | out: | |
462 | release_sock(sk); | |
463 | release_sock(listener); | |
464 | if (cleanup) | |
465 | sock_put(sk); | |
466 | ||
467 | sock_put(sk); | |
468 | sock_put(listener); | |
469 | } | |
d021c344 AK |
470 | |
471 | /**** SOCKET OPERATIONS ****/ | |
472 | ||
473 | static int __vsock_bind_stream(struct vsock_sock *vsk, | |
474 | struct sockaddr_vm *addr) | |
475 | { | |
a22d3251 | 476 | static u32 port; |
d021c344 AK |
477 | struct sockaddr_vm new_addr; |
478 | ||
8236b08c LW |
479 | if (!port) |
480 | port = LAST_RESERVED_PORT + 1 + | |
481 | prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); | |
482 | ||
d021c344 AK |
483 | vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); |
484 | ||
485 | if (addr->svm_port == VMADDR_PORT_ANY) { | |
486 | bool found = false; | |
487 | unsigned int i; | |
488 | ||
489 | for (i = 0; i < MAX_PORT_RETRIES; i++) { | |
490 | if (port <= LAST_RESERVED_PORT) | |
491 | port = LAST_RESERVED_PORT + 1; | |
492 | ||
493 | new_addr.svm_port = port++; | |
494 | ||
495 | if (!__vsock_find_bound_socket(&new_addr)) { | |
496 | found = true; | |
497 | break; | |
498 | } | |
499 | } | |
500 | ||
501 | if (!found) | |
502 | return -EADDRNOTAVAIL; | |
503 | } else { | |
504 | /* If port is in reserved range, ensure caller | |
505 | * has necessary privileges. | |
506 | */ | |
507 | if (addr->svm_port <= LAST_RESERVED_PORT && | |
508 | !capable(CAP_NET_BIND_SERVICE)) { | |
509 | return -EACCES; | |
510 | } | |
511 | ||
512 | if (__vsock_find_bound_socket(&new_addr)) | |
513 | return -EADDRINUSE; | |
514 | } | |
515 | ||
516 | vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); | |
517 | ||
518 | /* Remove stream sockets from the unbound list and add them to the hash | |
519 | * table for easy lookup by its address. The unbound list is simply an | |
520 | * extra entry at the end of the hash table, a trick used by AF_UNIX. | |
521 | */ | |
522 | __vsock_remove_bound(vsk); | |
523 | __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | static int __vsock_bind_dgram(struct vsock_sock *vsk, | |
529 | struct sockaddr_vm *addr) | |
530 | { | |
531 | return transport->dgram_bind(vsk, addr); | |
532 | } | |
533 | ||
534 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) | |
535 | { | |
536 | struct vsock_sock *vsk = vsock_sk(sk); | |
537 | u32 cid; | |
538 | int retval; | |
539 | ||
540 | /* First ensure this socket isn't already bound. */ | |
541 | if (vsock_addr_bound(&vsk->local_addr)) | |
542 | return -EINVAL; | |
543 | ||
544 | /* Now bind to the provided address or select appropriate values if | |
545 | * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that | |
546 | * like AF_INET prevents binding to a non-local IP address (in most | |
547 | * cases), we only allow binding to the local CID. | |
548 | */ | |
549 | cid = transport->get_local_cid(); | |
550 | if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) | |
551 | return -EADDRNOTAVAIL; | |
552 | ||
553 | switch (sk->sk_socket->type) { | |
554 | case SOCK_STREAM: | |
555 | spin_lock_bh(&vsock_table_lock); | |
556 | retval = __vsock_bind_stream(vsk, addr); | |
557 | spin_unlock_bh(&vsock_table_lock); | |
558 | break; | |
559 | ||
560 | case SOCK_DGRAM: | |
561 | retval = __vsock_bind_dgram(vsk, addr); | |
562 | break; | |
563 | ||
564 | default: | |
565 | retval = -EINVAL; | |
566 | break; | |
567 | } | |
568 | ||
569 | return retval; | |
570 | } | |
571 | ||
455f05ec CW |
572 | static void vsock_connect_timeout(struct work_struct *work); |
573 | ||
d021c344 AK |
574 | struct sock *__vsock_create(struct net *net, |
575 | struct socket *sock, | |
576 | struct sock *parent, | |
577 | gfp_t priority, | |
11aa9c28 EB |
578 | unsigned short type, |
579 | int kern) | |
d021c344 AK |
580 | { |
581 | struct sock *sk; | |
582 | struct vsock_sock *psk; | |
583 | struct vsock_sock *vsk; | |
584 | ||
11aa9c28 | 585 | sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); |
d021c344 AK |
586 | if (!sk) |
587 | return NULL; | |
588 | ||
589 | sock_init_data(sock, sk); | |
590 | ||
591 | /* sk->sk_type is normally set in sock_init_data, but only if sock is | |
592 | * non-NULL. We make sure that our sockets always have a type by | |
593 | * setting it here if needed. | |
594 | */ | |
595 | if (!sock) | |
596 | sk->sk_type = type; | |
597 | ||
598 | vsk = vsock_sk(sk); | |
599 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
600 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
601 | ||
602 | sk->sk_destruct = vsock_sk_destruct; | |
603 | sk->sk_backlog_rcv = vsock_queue_rcv_skb; | |
d021c344 AK |
604 | sock_reset_flag(sk, SOCK_DONE); |
605 | ||
606 | INIT_LIST_HEAD(&vsk->bound_table); | |
607 | INIT_LIST_HEAD(&vsk->connected_table); | |
608 | vsk->listener = NULL; | |
609 | INIT_LIST_HEAD(&vsk->pending_links); | |
610 | INIT_LIST_HEAD(&vsk->accept_queue); | |
611 | vsk->rejected = false; | |
612 | vsk->sent_request = false; | |
613 | vsk->ignore_connecting_rst = false; | |
614 | vsk->peer_shutdown = 0; | |
455f05ec CW |
615 | INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); |
616 | INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); | |
d021c344 AK |
617 | |
618 | psk = parent ? vsock_sk(parent) : NULL; | |
619 | if (parent) { | |
620 | vsk->trusted = psk->trusted; | |
621 | vsk->owner = get_cred(psk->owner); | |
622 | vsk->connect_timeout = psk->connect_timeout; | |
623 | } else { | |
624 | vsk->trusted = capable(CAP_NET_ADMIN); | |
625 | vsk->owner = get_current_cred(); | |
626 | vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
627 | } | |
628 | ||
629 | if (transport->init(vsk, psk) < 0) { | |
630 | sk_free(sk); | |
631 | return NULL; | |
632 | } | |
633 | ||
634 | if (sock) | |
635 | vsock_insert_unbound(vsk); | |
636 | ||
637 | return sk; | |
638 | } | |
639 | EXPORT_SYMBOL_GPL(__vsock_create); | |
640 | ||
0d9138ff | 641 | static void __vsock_release(struct sock *sk, int level) |
d021c344 AK |
642 | { |
643 | if (sk) { | |
644 | struct sk_buff *skb; | |
645 | struct sock *pending; | |
646 | struct vsock_sock *vsk; | |
647 | ||
648 | vsk = vsock_sk(sk); | |
649 | pending = NULL; /* Compiler warning. */ | |
650 | ||
0d9138ff DC |
651 | /* The release call is supposed to use lock_sock_nested() |
652 | * rather than lock_sock(), if a sock lock should be acquired. | |
653 | */ | |
d021c344 AK |
654 | transport->release(vsk); |
655 | ||
0d9138ff DC |
656 | /* When "level" is SINGLE_DEPTH_NESTING, use the nested |
657 | * version to avoid the warning "possible recursive locking | |
658 | * detected". When "level" is 0, lock_sock_nested(sk, level) | |
659 | * is the same as lock_sock(sk). | |
660 | */ | |
661 | lock_sock_nested(sk, level); | |
d021c344 AK |
662 | sock_orphan(sk); |
663 | sk->sk_shutdown = SHUTDOWN_MASK; | |
664 | ||
665 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) | |
666 | kfree_skb(skb); | |
667 | ||
668 | /* Clean up any sockets that never were accepted. */ | |
669 | while ((pending = vsock_dequeue_accept(sk)) != NULL) { | |
0d9138ff | 670 | __vsock_release(pending, SINGLE_DEPTH_NESTING); |
d021c344 AK |
671 | sock_put(pending); |
672 | } | |
673 | ||
674 | release_sock(sk); | |
675 | sock_put(sk); | |
676 | } | |
677 | } | |
678 | ||
679 | static void vsock_sk_destruct(struct sock *sk) | |
680 | { | |
681 | struct vsock_sock *vsk = vsock_sk(sk); | |
682 | ||
683 | transport->destruct(vsk); | |
684 | ||
685 | /* When clearing these addresses, there's no need to set the family and | |
686 | * possibly register the address family with the kernel. | |
687 | */ | |
688 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
689 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
690 | ||
691 | put_cred(vsk->owner); | |
692 | } | |
693 | ||
694 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
695 | { | |
696 | int err; | |
697 | ||
698 | err = sock_queue_rcv_skb(sk, skb); | |
699 | if (err) | |
700 | kfree_skb(skb); | |
701 | ||
702 | return err; | |
703 | } | |
704 | ||
705 | s64 vsock_stream_has_data(struct vsock_sock *vsk) | |
706 | { | |
707 | return transport->stream_has_data(vsk); | |
708 | } | |
709 | EXPORT_SYMBOL_GPL(vsock_stream_has_data); | |
710 | ||
711 | s64 vsock_stream_has_space(struct vsock_sock *vsk) | |
712 | { | |
713 | return transport->stream_has_space(vsk); | |
714 | } | |
715 | EXPORT_SYMBOL_GPL(vsock_stream_has_space); | |
716 | ||
717 | static int vsock_release(struct socket *sock) | |
718 | { | |
0d9138ff | 719 | __vsock_release(sock->sk, 0); |
d021c344 AK |
720 | sock->sk = NULL; |
721 | sock->state = SS_FREE; | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
726 | static int | |
727 | vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
728 | { | |
729 | int err; | |
730 | struct sock *sk; | |
731 | struct sockaddr_vm *vm_addr; | |
732 | ||
733 | sk = sock->sk; | |
734 | ||
735 | if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) | |
736 | return -EINVAL; | |
737 | ||
738 | lock_sock(sk); | |
739 | err = __vsock_bind(sk, vm_addr); | |
740 | release_sock(sk); | |
741 | ||
742 | return err; | |
743 | } | |
744 | ||
745 | static int vsock_getname(struct socket *sock, | |
9b2c45d4 | 746 | struct sockaddr *addr, int peer) |
d021c344 AK |
747 | { |
748 | int err; | |
749 | struct sock *sk; | |
750 | struct vsock_sock *vsk; | |
751 | struct sockaddr_vm *vm_addr; | |
752 | ||
753 | sk = sock->sk; | |
754 | vsk = vsock_sk(sk); | |
755 | err = 0; | |
756 | ||
757 | lock_sock(sk); | |
758 | ||
759 | if (peer) { | |
760 | if (sock->state != SS_CONNECTED) { | |
761 | err = -ENOTCONN; | |
762 | goto out; | |
763 | } | |
764 | vm_addr = &vsk->remote_addr; | |
765 | } else { | |
766 | vm_addr = &vsk->local_addr; | |
767 | } | |
768 | ||
769 | if (!vm_addr) { | |
770 | err = -EINVAL; | |
771 | goto out; | |
772 | } | |
773 | ||
774 | /* sys_getsockname() and sys_getpeername() pass us a | |
775 | * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately | |
776 | * that macro is defined in socket.c instead of .h, so we hardcode its | |
777 | * value here. | |
778 | */ | |
779 | BUILD_BUG_ON(sizeof(*vm_addr) > 128); | |
780 | memcpy(addr, vm_addr, sizeof(*vm_addr)); | |
9b2c45d4 | 781 | err = sizeof(*vm_addr); |
d021c344 AK |
782 | |
783 | out: | |
784 | release_sock(sk); | |
785 | return err; | |
786 | } | |
787 | ||
788 | static int vsock_shutdown(struct socket *sock, int mode) | |
789 | { | |
790 | int err; | |
791 | struct sock *sk; | |
792 | ||
793 | /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses | |
794 | * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode | |
795 | * here like the other address families do. Note also that the | |
796 | * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), | |
797 | * which is what we want. | |
798 | */ | |
799 | mode++; | |
800 | ||
801 | if ((mode & ~SHUTDOWN_MASK) || !mode) | |
802 | return -EINVAL; | |
803 | ||
804 | /* If this is a STREAM socket and it is not connected then bail out | |
805 | * immediately. If it is a DGRAM socket then we must first kick the | |
806 | * socket so that it wakes up from any sleeping calls, for example | |
807 | * recv(), and then afterwards return the error. | |
808 | */ | |
809 | ||
810 | sk = sock->sk; | |
811 | if (sock->state == SS_UNCONNECTED) { | |
812 | err = -ENOTCONN; | |
813 | if (sk->sk_type == SOCK_STREAM) | |
814 | return err; | |
815 | } else { | |
816 | sock->state = SS_DISCONNECTING; | |
817 | err = 0; | |
818 | } | |
819 | ||
820 | /* Receive and send shutdowns are treated alike. */ | |
821 | mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); | |
822 | if (mode) { | |
823 | lock_sock(sk); | |
824 | sk->sk_shutdown |= mode; | |
825 | sk->sk_state_change(sk); | |
826 | release_sock(sk); | |
827 | ||
828 | if (sk->sk_type == SOCK_STREAM) { | |
829 | sock_reset_flag(sk, SOCK_DONE); | |
830 | vsock_send_shutdown(sk, mode); | |
831 | } | |
832 | } | |
833 | ||
834 | return err; | |
835 | } | |
836 | ||
a11e1d43 LT |
837 | static __poll_t vsock_poll(struct file *file, struct socket *sock, |
838 | poll_table *wait) | |
d021c344 | 839 | { |
a11e1d43 LT |
840 | struct sock *sk; |
841 | __poll_t mask; | |
842 | struct vsock_sock *vsk; | |
843 | ||
844 | sk = sock->sk; | |
845 | vsk = vsock_sk(sk); | |
846 | ||
847 | poll_wait(file, sk_sleep(sk), wait); | |
848 | mask = 0; | |
d021c344 AK |
849 | |
850 | if (sk->sk_err) | |
851 | /* Signify that there has been an error on this socket. */ | |
a9a08845 | 852 | mask |= EPOLLERR; |
d021c344 AK |
853 | |
854 | /* INET sockets treat local write shutdown and peer write shutdown as a | |
a9a08845 | 855 | * case of EPOLLHUP set. |
d021c344 AK |
856 | */ |
857 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || | |
858 | ((sk->sk_shutdown & SEND_SHUTDOWN) && | |
859 | (vsk->peer_shutdown & SEND_SHUTDOWN))) { | |
a9a08845 | 860 | mask |= EPOLLHUP; |
d021c344 AK |
861 | } |
862 | ||
863 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
864 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 865 | mask |= EPOLLRDHUP; |
d021c344 AK |
866 | } |
867 | ||
868 | if (sock->type == SOCK_DGRAM) { | |
869 | /* For datagram sockets we can read if there is something in | |
870 | * the queue and write as long as the socket isn't shutdown for | |
871 | * sending. | |
872 | */ | |
3ef7cf57 | 873 | if (!skb_queue_empty_lockless(&sk->sk_receive_queue) || |
d021c344 | 874 | (sk->sk_shutdown & RCV_SHUTDOWN)) { |
a9a08845 | 875 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
876 | } |
877 | ||
878 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
a9a08845 | 879 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
d021c344 AK |
880 | |
881 | } else if (sock->type == SOCK_STREAM) { | |
882 | lock_sock(sk); | |
883 | ||
884 | /* Listening sockets that have connections in their accept | |
885 | * queue can be read. | |
886 | */ | |
3b4477d2 | 887 | if (sk->sk_state == TCP_LISTEN |
d021c344 | 888 | && !vsock_is_accept_queue_empty(sk)) |
a9a08845 | 889 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
890 | |
891 | /* If there is something in the queue then we can read. */ | |
892 | if (transport->stream_is_active(vsk) && | |
893 | !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
894 | bool data_ready_now = false; | |
895 | int ret = transport->notify_poll_in( | |
896 | vsk, 1, &data_ready_now); | |
897 | if (ret < 0) { | |
a9a08845 | 898 | mask |= EPOLLERR; |
d021c344 AK |
899 | } else { |
900 | if (data_ready_now) | |
a9a08845 | 901 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
902 | |
903 | } | |
904 | } | |
905 | ||
906 | /* Sockets whose connections have been closed, reset, or | |
907 | * terminated should also be considered read, and we check the | |
908 | * shutdown flag for that. | |
909 | */ | |
910 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
911 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 912 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
913 | } |
914 | ||
915 | /* Connected sockets that can produce data can be written. */ | |
3b4477d2 | 916 | if (sk->sk_state == TCP_ESTABLISHED) { |
d021c344 AK |
917 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
918 | bool space_avail_now = false; | |
919 | int ret = transport->notify_poll_out( | |
920 | vsk, 1, &space_avail_now); | |
921 | if (ret < 0) { | |
a9a08845 | 922 | mask |= EPOLLERR; |
d021c344 AK |
923 | } else { |
924 | if (space_avail_now) | |
a9a08845 | 925 | /* Remove EPOLLWRBAND since INET |
d021c344 AK |
926 | * sockets are not setting it. |
927 | */ | |
a9a08845 | 928 | mask |= EPOLLOUT | EPOLLWRNORM; |
d021c344 AK |
929 | |
930 | } | |
931 | } | |
932 | } | |
933 | ||
934 | /* Simulate INET socket poll behaviors, which sets | |
a9a08845 | 935 | * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, |
d021c344 AK |
936 | * but local send is not shutdown. |
937 | */ | |
ba3169fc | 938 | if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { |
d021c344 | 939 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) |
a9a08845 | 940 | mask |= EPOLLOUT | EPOLLWRNORM; |
d021c344 AK |
941 | |
942 | } | |
943 | ||
944 | release_sock(sk); | |
945 | } | |
946 | ||
947 | return mask; | |
948 | } | |
949 | ||
1b784140 YX |
950 | static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, |
951 | size_t len) | |
d021c344 AK |
952 | { |
953 | int err; | |
954 | struct sock *sk; | |
955 | struct vsock_sock *vsk; | |
956 | struct sockaddr_vm *remote_addr; | |
957 | ||
958 | if (msg->msg_flags & MSG_OOB) | |
959 | return -EOPNOTSUPP; | |
960 | ||
961 | /* For now, MSG_DONTWAIT is always assumed... */ | |
962 | err = 0; | |
963 | sk = sock->sk; | |
964 | vsk = vsock_sk(sk); | |
965 | ||
966 | lock_sock(sk); | |
967 | ||
b3a6dfe8 AH |
968 | err = vsock_auto_bind(vsk); |
969 | if (err) | |
970 | goto out; | |
d021c344 | 971 | |
d021c344 AK |
972 | |
973 | /* If the provided message contains an address, use that. Otherwise | |
974 | * fall back on the socket's remote handle (if it has been connected). | |
975 | */ | |
976 | if (msg->msg_name && | |
977 | vsock_addr_cast(msg->msg_name, msg->msg_namelen, | |
978 | &remote_addr) == 0) { | |
979 | /* Ensure this address is of the right type and is a valid | |
980 | * destination. | |
981 | */ | |
982 | ||
983 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
984 | remote_addr->svm_cid = transport->get_local_cid(); | |
985 | ||
986 | if (!vsock_addr_bound(remote_addr)) { | |
987 | err = -EINVAL; | |
988 | goto out; | |
989 | } | |
990 | } else if (sock->state == SS_CONNECTED) { | |
991 | remote_addr = &vsk->remote_addr; | |
992 | ||
993 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
994 | remote_addr->svm_cid = transport->get_local_cid(); | |
995 | ||
996 | /* XXX Should connect() or this function ensure remote_addr is | |
997 | * bound? | |
998 | */ | |
999 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1000 | err = -EINVAL; | |
1001 | goto out; | |
1002 | } | |
1003 | } else { | |
1004 | err = -EINVAL; | |
1005 | goto out; | |
1006 | } | |
1007 | ||
1008 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1009 | remote_addr->svm_port)) { | |
1010 | err = -EINVAL; | |
1011 | goto out; | |
1012 | } | |
1013 | ||
0f7db23a | 1014 | err = transport->dgram_enqueue(vsk, remote_addr, msg, len); |
d021c344 AK |
1015 | |
1016 | out: | |
1017 | release_sock(sk); | |
1018 | return err; | |
1019 | } | |
1020 | ||
1021 | static int vsock_dgram_connect(struct socket *sock, | |
1022 | struct sockaddr *addr, int addr_len, int flags) | |
1023 | { | |
1024 | int err; | |
1025 | struct sock *sk; | |
1026 | struct vsock_sock *vsk; | |
1027 | struct sockaddr_vm *remote_addr; | |
1028 | ||
1029 | sk = sock->sk; | |
1030 | vsk = vsock_sk(sk); | |
1031 | ||
1032 | err = vsock_addr_cast(addr, addr_len, &remote_addr); | |
1033 | if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { | |
1034 | lock_sock(sk); | |
1035 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, | |
1036 | VMADDR_PORT_ANY); | |
1037 | sock->state = SS_UNCONNECTED; | |
1038 | release_sock(sk); | |
1039 | return 0; | |
1040 | } else if (err != 0) | |
1041 | return -EINVAL; | |
1042 | ||
1043 | lock_sock(sk); | |
1044 | ||
b3a6dfe8 AH |
1045 | err = vsock_auto_bind(vsk); |
1046 | if (err) | |
1047 | goto out; | |
d021c344 AK |
1048 | |
1049 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1050 | remote_addr->svm_port)) { | |
1051 | err = -EINVAL; | |
1052 | goto out; | |
1053 | } | |
1054 | ||
1055 | memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); | |
1056 | sock->state = SS_CONNECTED; | |
1057 | ||
1058 | out: | |
1059 | release_sock(sk); | |
1060 | return err; | |
1061 | } | |
1062 | ||
1b784140 YX |
1063 | static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, |
1064 | size_t len, int flags) | |
d021c344 | 1065 | { |
1b784140 | 1066 | return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags); |
d021c344 AK |
1067 | } |
1068 | ||
1069 | static const struct proto_ops vsock_dgram_ops = { | |
1070 | .family = PF_VSOCK, | |
1071 | .owner = THIS_MODULE, | |
1072 | .release = vsock_release, | |
1073 | .bind = vsock_bind, | |
1074 | .connect = vsock_dgram_connect, | |
1075 | .socketpair = sock_no_socketpair, | |
1076 | .accept = sock_no_accept, | |
1077 | .getname = vsock_getname, | |
a11e1d43 | 1078 | .poll = vsock_poll, |
d021c344 AK |
1079 | .ioctl = sock_no_ioctl, |
1080 | .listen = sock_no_listen, | |
1081 | .shutdown = vsock_shutdown, | |
1082 | .setsockopt = sock_no_setsockopt, | |
1083 | .getsockopt = sock_no_getsockopt, | |
1084 | .sendmsg = vsock_dgram_sendmsg, | |
1085 | .recvmsg = vsock_dgram_recvmsg, | |
1086 | .mmap = sock_no_mmap, | |
1087 | .sendpage = sock_no_sendpage, | |
1088 | }; | |
1089 | ||
380feae0 PT |
1090 | static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) |
1091 | { | |
1092 | if (!transport->cancel_pkt) | |
1093 | return -EOPNOTSUPP; | |
1094 | ||
1095 | return transport->cancel_pkt(vsk); | |
1096 | } | |
1097 | ||
d021c344 AK |
1098 | static void vsock_connect_timeout(struct work_struct *work) |
1099 | { | |
1100 | struct sock *sk; | |
1101 | struct vsock_sock *vsk; | |
380feae0 | 1102 | int cancel = 0; |
d021c344 | 1103 | |
455f05ec | 1104 | vsk = container_of(work, struct vsock_sock, connect_work.work); |
d021c344 AK |
1105 | sk = sk_vsock(vsk); |
1106 | ||
1107 | lock_sock(sk); | |
3b4477d2 | 1108 | if (sk->sk_state == TCP_SYN_SENT && |
d021c344 | 1109 | (sk->sk_shutdown != SHUTDOWN_MASK)) { |
3b4477d2 | 1110 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
1111 | sk->sk_err = ETIMEDOUT; |
1112 | sk->sk_error_report(sk); | |
380feae0 | 1113 | cancel = 1; |
d021c344 AK |
1114 | } |
1115 | release_sock(sk); | |
380feae0 PT |
1116 | if (cancel) |
1117 | vsock_transport_cancel_pkt(vsk); | |
d021c344 AK |
1118 | |
1119 | sock_put(sk); | |
1120 | } | |
1121 | ||
1122 | static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, | |
1123 | int addr_len, int flags) | |
1124 | { | |
1125 | int err; | |
1126 | struct sock *sk; | |
1127 | struct vsock_sock *vsk; | |
1128 | struct sockaddr_vm *remote_addr; | |
1129 | long timeout; | |
1130 | DEFINE_WAIT(wait); | |
1131 | ||
1132 | err = 0; | |
1133 | sk = sock->sk; | |
1134 | vsk = vsock_sk(sk); | |
1135 | ||
1136 | lock_sock(sk); | |
1137 | ||
1138 | /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ | |
1139 | switch (sock->state) { | |
1140 | case SS_CONNECTED: | |
1141 | err = -EISCONN; | |
1142 | goto out; | |
1143 | case SS_DISCONNECTING: | |
1144 | err = -EINVAL; | |
1145 | goto out; | |
1146 | case SS_CONNECTING: | |
1147 | /* This continues on so we can move sock into the SS_CONNECTED | |
1148 | * state once the connection has completed (at which point err | |
1149 | * will be set to zero also). Otherwise, we will either wait | |
1150 | * for the connection or return -EALREADY should this be a | |
1151 | * non-blocking call. | |
1152 | */ | |
1153 | err = -EALREADY; | |
1154 | break; | |
1155 | default: | |
3b4477d2 | 1156 | if ((sk->sk_state == TCP_LISTEN) || |
d021c344 AK |
1157 | vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { |
1158 | err = -EINVAL; | |
1159 | goto out; | |
1160 | } | |
1161 | ||
1162 | /* The hypervisor and well-known contexts do not have socket | |
1163 | * endpoints. | |
1164 | */ | |
1165 | if (!transport->stream_allow(remote_addr->svm_cid, | |
1166 | remote_addr->svm_port)) { | |
1167 | err = -ENETUNREACH; | |
1168 | goto out; | |
1169 | } | |
1170 | ||
1171 | /* Set the remote address that we are connecting to. */ | |
1172 | memcpy(&vsk->remote_addr, remote_addr, | |
1173 | sizeof(vsk->remote_addr)); | |
1174 | ||
b3a6dfe8 AH |
1175 | err = vsock_auto_bind(vsk); |
1176 | if (err) | |
1177 | goto out; | |
d021c344 | 1178 | |
3b4477d2 | 1179 | sk->sk_state = TCP_SYN_SENT; |
d021c344 AK |
1180 | |
1181 | err = transport->connect(vsk); | |
1182 | if (err < 0) | |
1183 | goto out; | |
1184 | ||
1185 | /* Mark sock as connecting and set the error code to in | |
1186 | * progress in case this is a non-blocking connect. | |
1187 | */ | |
1188 | sock->state = SS_CONNECTING; | |
1189 | err = -EINPROGRESS; | |
1190 | } | |
1191 | ||
1192 | /* The receive path will handle all communication until we are able to | |
1193 | * enter the connected state. Here we wait for the connection to be | |
1194 | * completed or a notification of an error. | |
1195 | */ | |
1196 | timeout = vsk->connect_timeout; | |
1197 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1198 | ||
3b4477d2 | 1199 | while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { |
d021c344 AK |
1200 | if (flags & O_NONBLOCK) { |
1201 | /* If we're not going to block, we schedule a timeout | |
1202 | * function to generate a timeout on the connection | |
1203 | * attempt, in case the peer doesn't respond in a | |
1204 | * timely manner. We hold on to the socket until the | |
1205 | * timeout fires. | |
1206 | */ | |
1207 | sock_hold(sk); | |
455f05ec | 1208 | schedule_delayed_work(&vsk->connect_work, timeout); |
d021c344 AK |
1209 | |
1210 | /* Skip ahead to preserve error code set above. */ | |
1211 | goto out_wait; | |
1212 | } | |
1213 | ||
1214 | release_sock(sk); | |
1215 | timeout = schedule_timeout(timeout); | |
1216 | lock_sock(sk); | |
1217 | ||
1218 | if (signal_pending(current)) { | |
1219 | err = sock_intr_errno(timeout); | |
3b4477d2 | 1220 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 | 1221 | sock->state = SS_UNCONNECTED; |
380feae0 | 1222 | vsock_transport_cancel_pkt(vsk); |
f7f9b5e7 | 1223 | goto out_wait; |
d021c344 AK |
1224 | } else if (timeout == 0) { |
1225 | err = -ETIMEDOUT; | |
3b4477d2 | 1226 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 | 1227 | sock->state = SS_UNCONNECTED; |
380feae0 | 1228 | vsock_transport_cancel_pkt(vsk); |
f7f9b5e7 | 1229 | goto out_wait; |
d021c344 AK |
1230 | } |
1231 | ||
1232 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1233 | } | |
1234 | ||
1235 | if (sk->sk_err) { | |
1236 | err = -sk->sk_err; | |
3b4477d2 | 1237 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 CI |
1238 | sock->state = SS_UNCONNECTED; |
1239 | } else { | |
d021c344 | 1240 | err = 0; |
f7f9b5e7 | 1241 | } |
d021c344 AK |
1242 | |
1243 | out_wait: | |
1244 | finish_wait(sk_sleep(sk), &wait); | |
1245 | out: | |
1246 | release_sock(sk); | |
1247 | return err; | |
d021c344 AK |
1248 | } |
1249 | ||
cdfbabfb DH |
1250 | static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, |
1251 | bool kern) | |
d021c344 AK |
1252 | { |
1253 | struct sock *listener; | |
1254 | int err; | |
1255 | struct sock *connected; | |
1256 | struct vsock_sock *vconnected; | |
1257 | long timeout; | |
1258 | DEFINE_WAIT(wait); | |
1259 | ||
1260 | err = 0; | |
1261 | listener = sock->sk; | |
1262 | ||
1263 | lock_sock(listener); | |
1264 | ||
1265 | if (sock->type != SOCK_STREAM) { | |
1266 | err = -EOPNOTSUPP; | |
1267 | goto out; | |
1268 | } | |
1269 | ||
3b4477d2 | 1270 | if (listener->sk_state != TCP_LISTEN) { |
d021c344 AK |
1271 | err = -EINVAL; |
1272 | goto out; | |
1273 | } | |
1274 | ||
1275 | /* Wait for children sockets to appear; these are the new sockets | |
1276 | * created upon connection establishment. | |
1277 | */ | |
1278 | timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); | |
1279 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1280 | ||
1281 | while ((connected = vsock_dequeue_accept(listener)) == NULL && | |
1282 | listener->sk_err == 0) { | |
1283 | release_sock(listener); | |
1284 | timeout = schedule_timeout(timeout); | |
f7f9b5e7 | 1285 | finish_wait(sk_sleep(listener), &wait); |
d021c344 AK |
1286 | lock_sock(listener); |
1287 | ||
1288 | if (signal_pending(current)) { | |
1289 | err = sock_intr_errno(timeout); | |
f7f9b5e7 | 1290 | goto out; |
d021c344 AK |
1291 | } else if (timeout == 0) { |
1292 | err = -EAGAIN; | |
f7f9b5e7 | 1293 | goto out; |
d021c344 AK |
1294 | } |
1295 | ||
1296 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1297 | } | |
f7f9b5e7 | 1298 | finish_wait(sk_sleep(listener), &wait); |
d021c344 AK |
1299 | |
1300 | if (listener->sk_err) | |
1301 | err = -listener->sk_err; | |
1302 | ||
1303 | if (connected) { | |
1304 | listener->sk_ack_backlog--; | |
1305 | ||
4192f672 | 1306 | lock_sock_nested(connected, SINGLE_DEPTH_NESTING); |
d021c344 AK |
1307 | vconnected = vsock_sk(connected); |
1308 | ||
1309 | /* If the listener socket has received an error, then we should | |
1310 | * reject this socket and return. Note that we simply mark the | |
1311 | * socket rejected, drop our reference, and let the cleanup | |
1312 | * function handle the cleanup; the fact that we found it in | |
1313 | * the listener's accept queue guarantees that the cleanup | |
1314 | * function hasn't run yet. | |
1315 | */ | |
1316 | if (err) { | |
1317 | vconnected->rejected = true; | |
f7f9b5e7 CI |
1318 | } else { |
1319 | newsock->state = SS_CONNECTED; | |
1320 | sock_graft(connected, newsock); | |
d021c344 AK |
1321 | } |
1322 | ||
d021c344 AK |
1323 | release_sock(connected); |
1324 | sock_put(connected); | |
1325 | } | |
1326 | ||
d021c344 AK |
1327 | out: |
1328 | release_sock(listener); | |
1329 | return err; | |
1330 | } | |
1331 | ||
1332 | static int vsock_listen(struct socket *sock, int backlog) | |
1333 | { | |
1334 | int err; | |
1335 | struct sock *sk; | |
1336 | struct vsock_sock *vsk; | |
1337 | ||
1338 | sk = sock->sk; | |
1339 | ||
1340 | lock_sock(sk); | |
1341 | ||
1342 | if (sock->type != SOCK_STREAM) { | |
1343 | err = -EOPNOTSUPP; | |
1344 | goto out; | |
1345 | } | |
1346 | ||
1347 | if (sock->state != SS_UNCONNECTED) { | |
1348 | err = -EINVAL; | |
1349 | goto out; | |
1350 | } | |
1351 | ||
1352 | vsk = vsock_sk(sk); | |
1353 | ||
1354 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1355 | err = -EINVAL; | |
1356 | goto out; | |
1357 | } | |
1358 | ||
1359 | sk->sk_max_ack_backlog = backlog; | |
3b4477d2 | 1360 | sk->sk_state = TCP_LISTEN; |
d021c344 AK |
1361 | |
1362 | err = 0; | |
1363 | ||
1364 | out: | |
1365 | release_sock(sk); | |
1366 | return err; | |
1367 | } | |
1368 | ||
1369 | static int vsock_stream_setsockopt(struct socket *sock, | |
1370 | int level, | |
1371 | int optname, | |
1372 | char __user *optval, | |
1373 | unsigned int optlen) | |
1374 | { | |
1375 | int err; | |
1376 | struct sock *sk; | |
1377 | struct vsock_sock *vsk; | |
1378 | u64 val; | |
1379 | ||
1380 | if (level != AF_VSOCK) | |
1381 | return -ENOPROTOOPT; | |
1382 | ||
1383 | #define COPY_IN(_v) \ | |
1384 | do { \ | |
1385 | if (optlen < sizeof(_v)) { \ | |
1386 | err = -EINVAL; \ | |
1387 | goto exit; \ | |
1388 | } \ | |
1389 | if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ | |
1390 | err = -EFAULT; \ | |
1391 | goto exit; \ | |
1392 | } \ | |
1393 | } while (0) | |
1394 | ||
1395 | err = 0; | |
1396 | sk = sock->sk; | |
1397 | vsk = vsock_sk(sk); | |
1398 | ||
1399 | lock_sock(sk); | |
1400 | ||
1401 | switch (optname) { | |
1402 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1403 | COPY_IN(val); | |
1404 | transport->set_buffer_size(vsk, val); | |
1405 | break; | |
1406 | ||
1407 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1408 | COPY_IN(val); | |
1409 | transport->set_max_buffer_size(vsk, val); | |
1410 | break; | |
1411 | ||
1412 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1413 | COPY_IN(val); | |
1414 | transport->set_min_buffer_size(vsk, val); | |
1415 | break; | |
1416 | ||
1417 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
fe0c72f3 | 1418 | struct __kernel_old_timeval tv; |
d021c344 AK |
1419 | COPY_IN(tv); |
1420 | if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && | |
1421 | tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { | |
1422 | vsk->connect_timeout = tv.tv_sec * HZ + | |
1423 | DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); | |
1424 | if (vsk->connect_timeout == 0) | |
1425 | vsk->connect_timeout = | |
1426 | VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
1427 | ||
1428 | } else { | |
1429 | err = -ERANGE; | |
1430 | } | |
1431 | break; | |
1432 | } | |
1433 | ||
1434 | default: | |
1435 | err = -ENOPROTOOPT; | |
1436 | break; | |
1437 | } | |
1438 | ||
1439 | #undef COPY_IN | |
1440 | ||
1441 | exit: | |
1442 | release_sock(sk); | |
1443 | return err; | |
1444 | } | |
1445 | ||
1446 | static int vsock_stream_getsockopt(struct socket *sock, | |
1447 | int level, int optname, | |
1448 | char __user *optval, | |
1449 | int __user *optlen) | |
1450 | { | |
1451 | int err; | |
1452 | int len; | |
1453 | struct sock *sk; | |
1454 | struct vsock_sock *vsk; | |
1455 | u64 val; | |
1456 | ||
1457 | if (level != AF_VSOCK) | |
1458 | return -ENOPROTOOPT; | |
1459 | ||
1460 | err = get_user(len, optlen); | |
1461 | if (err != 0) | |
1462 | return err; | |
1463 | ||
1464 | #define COPY_OUT(_v) \ | |
1465 | do { \ | |
1466 | if (len < sizeof(_v)) \ | |
1467 | return -EINVAL; \ | |
1468 | \ | |
1469 | len = sizeof(_v); \ | |
1470 | if (copy_to_user(optval, &_v, len) != 0) \ | |
1471 | return -EFAULT; \ | |
1472 | \ | |
1473 | } while (0) | |
1474 | ||
1475 | err = 0; | |
1476 | sk = sock->sk; | |
1477 | vsk = vsock_sk(sk); | |
1478 | ||
1479 | switch (optname) { | |
1480 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1481 | val = transport->get_buffer_size(vsk); | |
1482 | COPY_OUT(val); | |
1483 | break; | |
1484 | ||
1485 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1486 | val = transport->get_max_buffer_size(vsk); | |
1487 | COPY_OUT(val); | |
1488 | break; | |
1489 | ||
1490 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1491 | val = transport->get_min_buffer_size(vsk); | |
1492 | COPY_OUT(val); | |
1493 | break; | |
1494 | ||
1495 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
fe0c72f3 | 1496 | struct __kernel_old_timeval tv; |
d021c344 AK |
1497 | tv.tv_sec = vsk->connect_timeout / HZ; |
1498 | tv.tv_usec = | |
1499 | (vsk->connect_timeout - | |
1500 | tv.tv_sec * HZ) * (1000000 / HZ); | |
1501 | COPY_OUT(tv); | |
1502 | break; | |
1503 | } | |
1504 | default: | |
1505 | return -ENOPROTOOPT; | |
1506 | } | |
1507 | ||
1508 | err = put_user(len, optlen); | |
1509 | if (err != 0) | |
1510 | return -EFAULT; | |
1511 | ||
1512 | #undef COPY_OUT | |
1513 | ||
1514 | return 0; | |
1515 | } | |
1516 | ||
1b784140 YX |
1517 | static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, |
1518 | size_t len) | |
d021c344 AK |
1519 | { |
1520 | struct sock *sk; | |
1521 | struct vsock_sock *vsk; | |
1522 | ssize_t total_written; | |
1523 | long timeout; | |
1524 | int err; | |
1525 | struct vsock_transport_send_notify_data send_data; | |
499fde66 | 1526 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
d021c344 AK |
1527 | |
1528 | sk = sock->sk; | |
1529 | vsk = vsock_sk(sk); | |
1530 | total_written = 0; | |
1531 | err = 0; | |
1532 | ||
1533 | if (msg->msg_flags & MSG_OOB) | |
1534 | return -EOPNOTSUPP; | |
1535 | ||
1536 | lock_sock(sk); | |
1537 | ||
1538 | /* Callers should not provide a destination with stream sockets. */ | |
1539 | if (msg->msg_namelen) { | |
3b4477d2 | 1540 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; |
d021c344 AK |
1541 | goto out; |
1542 | } | |
1543 | ||
1544 | /* Send data only if both sides are not shutdown in the direction. */ | |
1545 | if (sk->sk_shutdown & SEND_SHUTDOWN || | |
1546 | vsk->peer_shutdown & RCV_SHUTDOWN) { | |
1547 | err = -EPIPE; | |
1548 | goto out; | |
1549 | } | |
1550 | ||
3b4477d2 | 1551 | if (sk->sk_state != TCP_ESTABLISHED || |
d021c344 AK |
1552 | !vsock_addr_bound(&vsk->local_addr)) { |
1553 | err = -ENOTCONN; | |
1554 | goto out; | |
1555 | } | |
1556 | ||
1557 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1558 | err = -EDESTADDRREQ; | |
1559 | goto out; | |
1560 | } | |
1561 | ||
1562 | /* Wait for room in the produce queue to enqueue our user's data. */ | |
1563 | timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1564 | ||
1565 | err = transport->notify_send_init(vsk, &send_data); | |
1566 | if (err < 0) | |
1567 | goto out; | |
1568 | ||
d021c344 AK |
1569 | while (total_written < len) { |
1570 | ssize_t written; | |
1571 | ||
499fde66 | 1572 | add_wait_queue(sk_sleep(sk), &wait); |
d021c344 AK |
1573 | while (vsock_stream_has_space(vsk) == 0 && |
1574 | sk->sk_err == 0 && | |
1575 | !(sk->sk_shutdown & SEND_SHUTDOWN) && | |
1576 | !(vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1577 | ||
1578 | /* Don't wait for non-blocking sockets. */ | |
1579 | if (timeout == 0) { | |
1580 | err = -EAGAIN; | |
499fde66 | 1581 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1582 | goto out_err; |
d021c344 AK |
1583 | } |
1584 | ||
1585 | err = transport->notify_send_pre_block(vsk, &send_data); | |
f7f9b5e7 | 1586 | if (err < 0) { |
499fde66 | 1587 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 CI |
1588 | goto out_err; |
1589 | } | |
d021c344 AK |
1590 | |
1591 | release_sock(sk); | |
499fde66 | 1592 | timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); |
d021c344 AK |
1593 | lock_sock(sk); |
1594 | if (signal_pending(current)) { | |
1595 | err = sock_intr_errno(timeout); | |
499fde66 | 1596 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1597 | goto out_err; |
d021c344 AK |
1598 | } else if (timeout == 0) { |
1599 | err = -EAGAIN; | |
499fde66 | 1600 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1601 | goto out_err; |
d021c344 | 1602 | } |
d021c344 | 1603 | } |
499fde66 | 1604 | remove_wait_queue(sk_sleep(sk), &wait); |
d021c344 AK |
1605 | |
1606 | /* These checks occur both as part of and after the loop | |
1607 | * conditional since we need to check before and after | |
1608 | * sleeping. | |
1609 | */ | |
1610 | if (sk->sk_err) { | |
1611 | err = -sk->sk_err; | |
f7f9b5e7 | 1612 | goto out_err; |
d021c344 AK |
1613 | } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || |
1614 | (vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1615 | err = -EPIPE; | |
f7f9b5e7 | 1616 | goto out_err; |
d021c344 AK |
1617 | } |
1618 | ||
1619 | err = transport->notify_send_pre_enqueue(vsk, &send_data); | |
1620 | if (err < 0) | |
f7f9b5e7 | 1621 | goto out_err; |
d021c344 AK |
1622 | |
1623 | /* Note that enqueue will only write as many bytes as are free | |
1624 | * in the produce queue, so we don't need to ensure len is | |
1625 | * smaller than the queue size. It is the caller's | |
1626 | * responsibility to check how many bytes we were able to send. | |
1627 | */ | |
1628 | ||
1629 | written = transport->stream_enqueue( | |
0f7db23a | 1630 | vsk, msg, |
d021c344 AK |
1631 | len - total_written); |
1632 | if (written < 0) { | |
1633 | err = -ENOMEM; | |
f7f9b5e7 | 1634 | goto out_err; |
d021c344 AK |
1635 | } |
1636 | ||
1637 | total_written += written; | |
1638 | ||
1639 | err = transport->notify_send_post_enqueue( | |
1640 | vsk, written, &send_data); | |
1641 | if (err < 0) | |
f7f9b5e7 | 1642 | goto out_err; |
d021c344 AK |
1643 | |
1644 | } | |
1645 | ||
f7f9b5e7 | 1646 | out_err: |
d021c344 AK |
1647 | if (total_written > 0) |
1648 | err = total_written; | |
d021c344 AK |
1649 | out: |
1650 | release_sock(sk); | |
1651 | return err; | |
1652 | } | |
1653 | ||
1654 | ||
1655 | static int | |
1b784140 YX |
1656 | vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
1657 | int flags) | |
d021c344 AK |
1658 | { |
1659 | struct sock *sk; | |
1660 | struct vsock_sock *vsk; | |
1661 | int err; | |
1662 | size_t target; | |
1663 | ssize_t copied; | |
1664 | long timeout; | |
1665 | struct vsock_transport_recv_notify_data recv_data; | |
1666 | ||
1667 | DEFINE_WAIT(wait); | |
1668 | ||
1669 | sk = sock->sk; | |
1670 | vsk = vsock_sk(sk); | |
1671 | err = 0; | |
1672 | ||
1673 | lock_sock(sk); | |
1674 | ||
3b4477d2 | 1675 | if (sk->sk_state != TCP_ESTABLISHED) { |
d021c344 AK |
1676 | /* Recvmsg is supposed to return 0 if a peer performs an |
1677 | * orderly shutdown. Differentiate between that case and when a | |
1678 | * peer has not connected or a local shutdown occured with the | |
1679 | * SOCK_DONE flag. | |
1680 | */ | |
1681 | if (sock_flag(sk, SOCK_DONE)) | |
1682 | err = 0; | |
1683 | else | |
1684 | err = -ENOTCONN; | |
1685 | ||
1686 | goto out; | |
1687 | } | |
1688 | ||
1689 | if (flags & MSG_OOB) { | |
1690 | err = -EOPNOTSUPP; | |
1691 | goto out; | |
1692 | } | |
1693 | ||
1694 | /* We don't check peer_shutdown flag here since peer may actually shut | |
1695 | * down, but there can be data in the queue that a local socket can | |
1696 | * receive. | |
1697 | */ | |
1698 | if (sk->sk_shutdown & RCV_SHUTDOWN) { | |
1699 | err = 0; | |
1700 | goto out; | |
1701 | } | |
1702 | ||
1703 | /* It is valid on Linux to pass in a zero-length receive buffer. This | |
1704 | * is not an error. We may as well bail out now. | |
1705 | */ | |
1706 | if (!len) { | |
1707 | err = 0; | |
1708 | goto out; | |
1709 | } | |
1710 | ||
1711 | /* We must not copy less than target bytes into the user's buffer | |
1712 | * before returning successfully, so we wait for the consume queue to | |
1713 | * have that much data to consume before dequeueing. Note that this | |
1714 | * makes it impossible to handle cases where target is greater than the | |
1715 | * queue size. | |
1716 | */ | |
1717 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1718 | if (target >= transport->stream_rcvhiwat(vsk)) { | |
1719 | err = -ENOMEM; | |
1720 | goto out; | |
1721 | } | |
1722 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1723 | copied = 0; | |
1724 | ||
1725 | err = transport->notify_recv_init(vsk, target, &recv_data); | |
1726 | if (err < 0) | |
1727 | goto out; | |
1728 | ||
d021c344 AK |
1729 | |
1730 | while (1) { | |
f7f9b5e7 | 1731 | s64 ready; |
d021c344 | 1732 | |
f7f9b5e7 CI |
1733 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1734 | ready = vsock_stream_has_data(vsk); | |
d021c344 | 1735 | |
f7f9b5e7 CI |
1736 | if (ready == 0) { |
1737 | if (sk->sk_err != 0 || | |
1738 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1739 | (vsk->peer_shutdown & SEND_SHUTDOWN)) { | |
1740 | finish_wait(sk_sleep(sk), &wait); | |
1741 | break; | |
1742 | } | |
1743 | /* Don't wait for non-blocking sockets. */ | |
1744 | if (timeout == 0) { | |
1745 | err = -EAGAIN; | |
1746 | finish_wait(sk_sleep(sk), &wait); | |
1747 | break; | |
1748 | } | |
1749 | ||
1750 | err = transport->notify_recv_pre_block( | |
1751 | vsk, target, &recv_data); | |
1752 | if (err < 0) { | |
1753 | finish_wait(sk_sleep(sk), &wait); | |
1754 | break; | |
1755 | } | |
1756 | release_sock(sk); | |
1757 | timeout = schedule_timeout(timeout); | |
1758 | lock_sock(sk); | |
1759 | ||
1760 | if (signal_pending(current)) { | |
1761 | err = sock_intr_errno(timeout); | |
1762 | finish_wait(sk_sleep(sk), &wait); | |
1763 | break; | |
1764 | } else if (timeout == 0) { | |
1765 | err = -EAGAIN; | |
1766 | finish_wait(sk_sleep(sk), &wait); | |
1767 | break; | |
1768 | } | |
1769 | } else { | |
d021c344 AK |
1770 | ssize_t read; |
1771 | ||
f7f9b5e7 CI |
1772 | finish_wait(sk_sleep(sk), &wait); |
1773 | ||
1774 | if (ready < 0) { | |
1775 | /* Invalid queue pair content. XXX This should | |
1776 | * be changed to a connection reset in a later | |
1777 | * change. | |
1778 | */ | |
1779 | ||
1780 | err = -ENOMEM; | |
1781 | goto out; | |
1782 | } | |
1783 | ||
d021c344 AK |
1784 | err = transport->notify_recv_pre_dequeue( |
1785 | vsk, target, &recv_data); | |
1786 | if (err < 0) | |
1787 | break; | |
1788 | ||
1789 | read = transport->stream_dequeue( | |
0f7db23a | 1790 | vsk, msg, |
d021c344 AK |
1791 | len - copied, flags); |
1792 | if (read < 0) { | |
1793 | err = -ENOMEM; | |
1794 | break; | |
1795 | } | |
1796 | ||
1797 | copied += read; | |
1798 | ||
1799 | err = transport->notify_recv_post_dequeue( | |
1800 | vsk, target, read, | |
1801 | !(flags & MSG_PEEK), &recv_data); | |
1802 | if (err < 0) | |
f7f9b5e7 | 1803 | goto out; |
d021c344 AK |
1804 | |
1805 | if (read >= target || flags & MSG_PEEK) | |
1806 | break; | |
1807 | ||
1808 | target -= read; | |
d021c344 AK |
1809 | } |
1810 | } | |
1811 | ||
1812 | if (sk->sk_err) | |
1813 | err = -sk->sk_err; | |
1814 | else if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1815 | err = 0; | |
1816 | ||
dedc58e0 | 1817 | if (copied > 0) |
d021c344 | 1818 | err = copied; |
d021c344 | 1819 | |
d021c344 AK |
1820 | out: |
1821 | release_sock(sk); | |
1822 | return err; | |
1823 | } | |
1824 | ||
1825 | static const struct proto_ops vsock_stream_ops = { | |
1826 | .family = PF_VSOCK, | |
1827 | .owner = THIS_MODULE, | |
1828 | .release = vsock_release, | |
1829 | .bind = vsock_bind, | |
1830 | .connect = vsock_stream_connect, | |
1831 | .socketpair = sock_no_socketpair, | |
1832 | .accept = vsock_accept, | |
1833 | .getname = vsock_getname, | |
a11e1d43 | 1834 | .poll = vsock_poll, |
d021c344 AK |
1835 | .ioctl = sock_no_ioctl, |
1836 | .listen = vsock_listen, | |
1837 | .shutdown = vsock_shutdown, | |
1838 | .setsockopt = vsock_stream_setsockopt, | |
1839 | .getsockopt = vsock_stream_getsockopt, | |
1840 | .sendmsg = vsock_stream_sendmsg, | |
1841 | .recvmsg = vsock_stream_recvmsg, | |
1842 | .mmap = sock_no_mmap, | |
1843 | .sendpage = sock_no_sendpage, | |
1844 | }; | |
1845 | ||
1846 | static int vsock_create(struct net *net, struct socket *sock, | |
1847 | int protocol, int kern) | |
1848 | { | |
1849 | if (!sock) | |
1850 | return -EINVAL; | |
1851 | ||
6cf1c5fc | 1852 | if (protocol && protocol != PF_VSOCK) |
d021c344 AK |
1853 | return -EPROTONOSUPPORT; |
1854 | ||
1855 | switch (sock->type) { | |
1856 | case SOCK_DGRAM: | |
1857 | sock->ops = &vsock_dgram_ops; | |
1858 | break; | |
1859 | case SOCK_STREAM: | |
1860 | sock->ops = &vsock_stream_ops; | |
1861 | break; | |
1862 | default: | |
1863 | return -ESOCKTNOSUPPORT; | |
1864 | } | |
1865 | ||
1866 | sock->state = SS_UNCONNECTED; | |
1867 | ||
11aa9c28 | 1868 | return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM; |
d021c344 AK |
1869 | } |
1870 | ||
1871 | static const struct net_proto_family vsock_family_ops = { | |
1872 | .family = AF_VSOCK, | |
1873 | .create = vsock_create, | |
1874 | .owner = THIS_MODULE, | |
1875 | }; | |
1876 | ||
1877 | static long vsock_dev_do_ioctl(struct file *filp, | |
1878 | unsigned int cmd, void __user *ptr) | |
1879 | { | |
1880 | u32 __user *p = ptr; | |
1881 | int retval = 0; | |
1882 | ||
1883 | switch (cmd) { | |
1884 | case IOCTL_VM_SOCKETS_GET_LOCAL_CID: | |
1885 | if (put_user(transport->get_local_cid(), p) != 0) | |
1886 | retval = -EFAULT; | |
1887 | break; | |
1888 | ||
1889 | default: | |
1890 | pr_err("Unknown ioctl %d\n", cmd); | |
1891 | retval = -EINVAL; | |
1892 | } | |
1893 | ||
1894 | return retval; | |
1895 | } | |
1896 | ||
1897 | static long vsock_dev_ioctl(struct file *filp, | |
1898 | unsigned int cmd, unsigned long arg) | |
1899 | { | |
1900 | return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); | |
1901 | } | |
1902 | ||
1903 | #ifdef CONFIG_COMPAT | |
1904 | static long vsock_dev_compat_ioctl(struct file *filp, | |
1905 | unsigned int cmd, unsigned long arg) | |
1906 | { | |
1907 | return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); | |
1908 | } | |
1909 | #endif | |
1910 | ||
1911 | static const struct file_operations vsock_device_ops = { | |
1912 | .owner = THIS_MODULE, | |
1913 | .unlocked_ioctl = vsock_dev_ioctl, | |
1914 | #ifdef CONFIG_COMPAT | |
1915 | .compat_ioctl = vsock_dev_compat_ioctl, | |
1916 | #endif | |
1917 | .open = nonseekable_open, | |
1918 | }; | |
1919 | ||
1920 | static struct miscdevice vsock_device = { | |
1921 | .name = "vsock", | |
d021c344 AK |
1922 | .fops = &vsock_device_ops, |
1923 | }; | |
1924 | ||
2c4a336e | 1925 | int __vsock_core_init(const struct vsock_transport *t, struct module *owner) |
d021c344 | 1926 | { |
2c4a336e AK |
1927 | int err = mutex_lock_interruptible(&vsock_register_mutex); |
1928 | ||
1929 | if (err) | |
1930 | return err; | |
1931 | ||
1932 | if (transport) { | |
1933 | err = -EBUSY; | |
1934 | goto err_busy; | |
1935 | } | |
1936 | ||
1937 | /* Transport must be the owner of the protocol so that it can't | |
1938 | * unload while there are open sockets. | |
1939 | */ | |
1940 | vsock_proto.owner = owner; | |
1941 | transport = t; | |
d021c344 | 1942 | |
6ad0b2f7 | 1943 | vsock_device.minor = MISC_DYNAMIC_MINOR; |
d021c344 AK |
1944 | err = misc_register(&vsock_device); |
1945 | if (err) { | |
1946 | pr_err("Failed to register misc device\n"); | |
f6a835bb | 1947 | goto err_reset_transport; |
d021c344 AK |
1948 | } |
1949 | ||
1950 | err = proto_register(&vsock_proto, 1); /* we want our slab */ | |
1951 | if (err) { | |
1952 | pr_err("Cannot register vsock protocol\n"); | |
f6a835bb | 1953 | goto err_deregister_misc; |
d021c344 AK |
1954 | } |
1955 | ||
1956 | err = sock_register(&vsock_family_ops); | |
1957 | if (err) { | |
1958 | pr_err("could not register af_vsock (%d) address family: %d\n", | |
1959 | AF_VSOCK, err); | |
1960 | goto err_unregister_proto; | |
1961 | } | |
1962 | ||
2c4a336e | 1963 | mutex_unlock(&vsock_register_mutex); |
d021c344 AK |
1964 | return 0; |
1965 | ||
1966 | err_unregister_proto: | |
1967 | proto_unregister(&vsock_proto); | |
f6a835bb | 1968 | err_deregister_misc: |
d021c344 | 1969 | misc_deregister(&vsock_device); |
f6a835bb | 1970 | err_reset_transport: |
2c4a336e AK |
1971 | transport = NULL; |
1972 | err_busy: | |
d021c344 | 1973 | mutex_unlock(&vsock_register_mutex); |
2c4a336e | 1974 | return err; |
d021c344 | 1975 | } |
2c4a336e | 1976 | EXPORT_SYMBOL_GPL(__vsock_core_init); |
d021c344 AK |
1977 | |
1978 | void vsock_core_exit(void) | |
1979 | { | |
1980 | mutex_lock(&vsock_register_mutex); | |
1981 | ||
1982 | misc_deregister(&vsock_device); | |
1983 | sock_unregister(AF_VSOCK); | |
1984 | proto_unregister(&vsock_proto); | |
1985 | ||
1986 | /* We do not want the assignment below re-ordered. */ | |
1987 | mb(); | |
1988 | transport = NULL; | |
1989 | ||
1990 | mutex_unlock(&vsock_register_mutex); | |
1991 | } | |
1992 | EXPORT_SYMBOL_GPL(vsock_core_exit); | |
1993 | ||
0b01aeb3 SH |
1994 | const struct vsock_transport *vsock_core_get_transport(void) |
1995 | { | |
1996 | /* vsock_register_mutex not taken since only the transport uses this | |
1997 | * function and only while registered. | |
1998 | */ | |
1999 | return transport; | |
2000 | } | |
2001 | EXPORT_SYMBOL_GPL(vsock_core_get_transport); | |
2002 | ||
05e489b1 SH |
2003 | static void __exit vsock_exit(void) |
2004 | { | |
2005 | /* Do nothing. This function makes this module removable. */ | |
2006 | } | |
2007 | ||
c1eef220 | 2008 | module_init(vsock_init_tables); |
05e489b1 | 2009 | module_exit(vsock_exit); |
c1eef220 | 2010 | |
d021c344 AK |
2011 | MODULE_AUTHOR("VMware, Inc."); |
2012 | MODULE_DESCRIPTION("VMware Virtual Socket Family"); | |
1190cfdb | 2013 | MODULE_VERSION("1.0.2.0-k"); |
d021c344 | 2014 | MODULE_LICENSE("GPL v2"); |