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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); | |
277 | __vsock_remove_bound(vsk); | |
278 | spin_unlock_bh(&vsock_table_lock); | |
279 | } | |
280 | EXPORT_SYMBOL_GPL(vsock_remove_bound); | |
281 | ||
282 | void vsock_remove_connected(struct vsock_sock *vsk) | |
283 | { | |
284 | spin_lock_bh(&vsock_table_lock); | |
285 | __vsock_remove_connected(vsk); | |
286 | spin_unlock_bh(&vsock_table_lock); | |
287 | } | |
288 | EXPORT_SYMBOL_GPL(vsock_remove_connected); | |
289 | ||
290 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) | |
291 | { | |
292 | struct sock *sk; | |
293 | ||
294 | spin_lock_bh(&vsock_table_lock); | |
295 | sk = __vsock_find_bound_socket(addr); | |
296 | if (sk) | |
297 | sock_hold(sk); | |
298 | ||
299 | spin_unlock_bh(&vsock_table_lock); | |
300 | ||
301 | return sk; | |
302 | } | |
303 | EXPORT_SYMBOL_GPL(vsock_find_bound_socket); | |
304 | ||
305 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, | |
306 | struct sockaddr_vm *dst) | |
307 | { | |
308 | struct sock *sk; | |
309 | ||
310 | spin_lock_bh(&vsock_table_lock); | |
311 | sk = __vsock_find_connected_socket(src, dst); | |
312 | if (sk) | |
313 | sock_hold(sk); | |
314 | ||
315 | spin_unlock_bh(&vsock_table_lock); | |
316 | ||
317 | return sk; | |
318 | } | |
319 | EXPORT_SYMBOL_GPL(vsock_find_connected_socket); | |
320 | ||
321 | static bool vsock_in_bound_table(struct vsock_sock *vsk) | |
322 | { | |
323 | bool ret; | |
324 | ||
325 | spin_lock_bh(&vsock_table_lock); | |
326 | ret = __vsock_in_bound_table(vsk); | |
327 | spin_unlock_bh(&vsock_table_lock); | |
328 | ||
329 | return ret; | |
330 | } | |
331 | ||
332 | static bool vsock_in_connected_table(struct vsock_sock *vsk) | |
333 | { | |
334 | bool ret; | |
335 | ||
336 | spin_lock_bh(&vsock_table_lock); | |
337 | ret = __vsock_in_connected_table(vsk); | |
338 | spin_unlock_bh(&vsock_table_lock); | |
339 | ||
340 | return ret; | |
341 | } | |
342 | ||
6773b7dc SH |
343 | void vsock_remove_sock(struct vsock_sock *vsk) |
344 | { | |
345 | if (vsock_in_bound_table(vsk)) | |
346 | vsock_remove_bound(vsk); | |
347 | ||
348 | if (vsock_in_connected_table(vsk)) | |
349 | vsock_remove_connected(vsk); | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(vsock_remove_sock); | |
352 | ||
d021c344 AK |
353 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) |
354 | { | |
355 | int i; | |
356 | ||
357 | spin_lock_bh(&vsock_table_lock); | |
358 | ||
359 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { | |
360 | struct vsock_sock *vsk; | |
361 | list_for_each_entry(vsk, &vsock_connected_table[i], | |
d9af2d67 | 362 | connected_table) |
d021c344 AK |
363 | fn(sk_vsock(vsk)); |
364 | } | |
365 | ||
366 | spin_unlock_bh(&vsock_table_lock); | |
367 | } | |
368 | EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); | |
369 | ||
370 | void vsock_add_pending(struct sock *listener, struct sock *pending) | |
371 | { | |
372 | struct vsock_sock *vlistener; | |
373 | struct vsock_sock *vpending; | |
374 | ||
375 | vlistener = vsock_sk(listener); | |
376 | vpending = vsock_sk(pending); | |
377 | ||
378 | sock_hold(pending); | |
379 | sock_hold(listener); | |
380 | list_add_tail(&vpending->pending_links, &vlistener->pending_links); | |
381 | } | |
382 | EXPORT_SYMBOL_GPL(vsock_add_pending); | |
383 | ||
384 | void vsock_remove_pending(struct sock *listener, struct sock *pending) | |
385 | { | |
386 | struct vsock_sock *vpending = vsock_sk(pending); | |
387 | ||
388 | list_del_init(&vpending->pending_links); | |
389 | sock_put(listener); | |
390 | sock_put(pending); | |
391 | } | |
392 | EXPORT_SYMBOL_GPL(vsock_remove_pending); | |
393 | ||
394 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected) | |
395 | { | |
396 | struct vsock_sock *vlistener; | |
397 | struct vsock_sock *vconnected; | |
398 | ||
399 | vlistener = vsock_sk(listener); | |
400 | vconnected = vsock_sk(connected); | |
401 | ||
402 | sock_hold(connected); | |
403 | sock_hold(listener); | |
404 | list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); | |
405 | } | |
406 | EXPORT_SYMBOL_GPL(vsock_enqueue_accept); | |
407 | ||
408 | static struct sock *vsock_dequeue_accept(struct sock *listener) | |
409 | { | |
410 | struct vsock_sock *vlistener; | |
411 | struct vsock_sock *vconnected; | |
412 | ||
413 | vlistener = vsock_sk(listener); | |
414 | ||
415 | if (list_empty(&vlistener->accept_queue)) | |
416 | return NULL; | |
417 | ||
418 | vconnected = list_entry(vlistener->accept_queue.next, | |
419 | struct vsock_sock, accept_queue); | |
420 | ||
421 | list_del_init(&vconnected->accept_queue); | |
422 | sock_put(listener); | |
423 | /* The caller will need a reference on the connected socket so we let | |
424 | * it call sock_put(). | |
425 | */ | |
426 | ||
427 | return sk_vsock(vconnected); | |
428 | } | |
429 | ||
430 | static bool vsock_is_accept_queue_empty(struct sock *sk) | |
431 | { | |
432 | struct vsock_sock *vsk = vsock_sk(sk); | |
433 | return list_empty(&vsk->accept_queue); | |
434 | } | |
435 | ||
436 | static bool vsock_is_pending(struct sock *sk) | |
437 | { | |
438 | struct vsock_sock *vsk = vsock_sk(sk); | |
439 | return !list_empty(&vsk->pending_links); | |
440 | } | |
441 | ||
442 | static int vsock_send_shutdown(struct sock *sk, int mode) | |
443 | { | |
444 | return transport->shutdown(vsock_sk(sk), mode); | |
445 | } | |
446 | ||
455f05ec | 447 | static void vsock_pending_work(struct work_struct *work) |
d021c344 AK |
448 | { |
449 | struct sock *sk; | |
450 | struct sock *listener; | |
451 | struct vsock_sock *vsk; | |
452 | bool cleanup; | |
453 | ||
455f05ec | 454 | vsk = container_of(work, struct vsock_sock, pending_work.work); |
d021c344 AK |
455 | sk = sk_vsock(vsk); |
456 | listener = vsk->listener; | |
457 | cleanup = true; | |
458 | ||
459 | lock_sock(listener); | |
4192f672 | 460 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
d021c344 AK |
461 | |
462 | if (vsock_is_pending(sk)) { | |
463 | vsock_remove_pending(listener, sk); | |
1190cfdb JH |
464 | |
465 | listener->sk_ack_backlog--; | |
d021c344 AK |
466 | } else if (!vsk->rejected) { |
467 | /* We are not on the pending list and accept() did not reject | |
468 | * us, so we must have been accepted by our user process. We | |
469 | * just need to drop our references to the sockets and be on | |
470 | * our way. | |
471 | */ | |
472 | cleanup = false; | |
473 | goto out; | |
474 | } | |
475 | ||
d021c344 AK |
476 | /* We need to remove ourself from the global connected sockets list so |
477 | * incoming packets can't find this socket, and to reduce the reference | |
478 | * count. | |
479 | */ | |
480 | if (vsock_in_connected_table(vsk)) | |
481 | vsock_remove_connected(vsk); | |
482 | ||
3b4477d2 | 483 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
484 | |
485 | out: | |
486 | release_sock(sk); | |
487 | release_sock(listener); | |
488 | if (cleanup) | |
489 | sock_put(sk); | |
490 | ||
491 | sock_put(sk); | |
492 | sock_put(listener); | |
493 | } | |
d021c344 AK |
494 | |
495 | /**** SOCKET OPERATIONS ****/ | |
496 | ||
497 | static int __vsock_bind_stream(struct vsock_sock *vsk, | |
498 | struct sockaddr_vm *addr) | |
499 | { | |
a22d3251 | 500 | static u32 port; |
d021c344 AK |
501 | struct sockaddr_vm new_addr; |
502 | ||
8236b08c LW |
503 | if (!port) |
504 | port = LAST_RESERVED_PORT + 1 + | |
505 | prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); | |
506 | ||
d021c344 AK |
507 | vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); |
508 | ||
509 | if (addr->svm_port == VMADDR_PORT_ANY) { | |
510 | bool found = false; | |
511 | unsigned int i; | |
512 | ||
513 | for (i = 0; i < MAX_PORT_RETRIES; i++) { | |
514 | if (port <= LAST_RESERVED_PORT) | |
515 | port = LAST_RESERVED_PORT + 1; | |
516 | ||
517 | new_addr.svm_port = port++; | |
518 | ||
519 | if (!__vsock_find_bound_socket(&new_addr)) { | |
520 | found = true; | |
521 | break; | |
522 | } | |
523 | } | |
524 | ||
525 | if (!found) | |
526 | return -EADDRNOTAVAIL; | |
527 | } else { | |
528 | /* If port is in reserved range, ensure caller | |
529 | * has necessary privileges. | |
530 | */ | |
531 | if (addr->svm_port <= LAST_RESERVED_PORT && | |
532 | !capable(CAP_NET_BIND_SERVICE)) { | |
533 | return -EACCES; | |
534 | } | |
535 | ||
536 | if (__vsock_find_bound_socket(&new_addr)) | |
537 | return -EADDRINUSE; | |
538 | } | |
539 | ||
540 | vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); | |
541 | ||
542 | /* Remove stream sockets from the unbound list and add them to the hash | |
543 | * table for easy lookup by its address. The unbound list is simply an | |
544 | * extra entry at the end of the hash table, a trick used by AF_UNIX. | |
545 | */ | |
546 | __vsock_remove_bound(vsk); | |
547 | __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static int __vsock_bind_dgram(struct vsock_sock *vsk, | |
553 | struct sockaddr_vm *addr) | |
554 | { | |
555 | return transport->dgram_bind(vsk, addr); | |
556 | } | |
557 | ||
558 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) | |
559 | { | |
560 | struct vsock_sock *vsk = vsock_sk(sk); | |
561 | u32 cid; | |
562 | int retval; | |
563 | ||
564 | /* First ensure this socket isn't already bound. */ | |
565 | if (vsock_addr_bound(&vsk->local_addr)) | |
566 | return -EINVAL; | |
567 | ||
568 | /* Now bind to the provided address or select appropriate values if | |
569 | * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that | |
570 | * like AF_INET prevents binding to a non-local IP address (in most | |
571 | * cases), we only allow binding to the local CID. | |
572 | */ | |
573 | cid = transport->get_local_cid(); | |
574 | if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) | |
575 | return -EADDRNOTAVAIL; | |
576 | ||
577 | switch (sk->sk_socket->type) { | |
578 | case SOCK_STREAM: | |
579 | spin_lock_bh(&vsock_table_lock); | |
580 | retval = __vsock_bind_stream(vsk, addr); | |
581 | spin_unlock_bh(&vsock_table_lock); | |
582 | break; | |
583 | ||
584 | case SOCK_DGRAM: | |
585 | retval = __vsock_bind_dgram(vsk, addr); | |
586 | break; | |
587 | ||
588 | default: | |
589 | retval = -EINVAL; | |
590 | break; | |
591 | } | |
592 | ||
593 | return retval; | |
594 | } | |
595 | ||
455f05ec CW |
596 | static void vsock_connect_timeout(struct work_struct *work); |
597 | ||
d021c344 AK |
598 | struct sock *__vsock_create(struct net *net, |
599 | struct socket *sock, | |
600 | struct sock *parent, | |
601 | gfp_t priority, | |
11aa9c28 EB |
602 | unsigned short type, |
603 | int kern) | |
d021c344 AK |
604 | { |
605 | struct sock *sk; | |
606 | struct vsock_sock *psk; | |
607 | struct vsock_sock *vsk; | |
608 | ||
11aa9c28 | 609 | sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); |
d021c344 AK |
610 | if (!sk) |
611 | return NULL; | |
612 | ||
613 | sock_init_data(sock, sk); | |
614 | ||
615 | /* sk->sk_type is normally set in sock_init_data, but only if sock is | |
616 | * non-NULL. We make sure that our sockets always have a type by | |
617 | * setting it here if needed. | |
618 | */ | |
619 | if (!sock) | |
620 | sk->sk_type = type; | |
621 | ||
622 | vsk = vsock_sk(sk); | |
623 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
624 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
625 | ||
626 | sk->sk_destruct = vsock_sk_destruct; | |
627 | sk->sk_backlog_rcv = vsock_queue_rcv_skb; | |
d021c344 AK |
628 | sock_reset_flag(sk, SOCK_DONE); |
629 | ||
630 | INIT_LIST_HEAD(&vsk->bound_table); | |
631 | INIT_LIST_HEAD(&vsk->connected_table); | |
632 | vsk->listener = NULL; | |
633 | INIT_LIST_HEAD(&vsk->pending_links); | |
634 | INIT_LIST_HEAD(&vsk->accept_queue); | |
635 | vsk->rejected = false; | |
636 | vsk->sent_request = false; | |
637 | vsk->ignore_connecting_rst = false; | |
638 | vsk->peer_shutdown = 0; | |
455f05ec CW |
639 | INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); |
640 | INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); | |
d021c344 AK |
641 | |
642 | psk = parent ? vsock_sk(parent) : NULL; | |
643 | if (parent) { | |
644 | vsk->trusted = psk->trusted; | |
645 | vsk->owner = get_cred(psk->owner); | |
646 | vsk->connect_timeout = psk->connect_timeout; | |
647 | } else { | |
648 | vsk->trusted = capable(CAP_NET_ADMIN); | |
649 | vsk->owner = get_current_cred(); | |
650 | vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
651 | } | |
652 | ||
653 | if (transport->init(vsk, psk) < 0) { | |
654 | sk_free(sk); | |
655 | return NULL; | |
656 | } | |
657 | ||
658 | if (sock) | |
659 | vsock_insert_unbound(vsk); | |
660 | ||
661 | return sk; | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(__vsock_create); | |
664 | ||
665 | static void __vsock_release(struct sock *sk) | |
666 | { | |
667 | if (sk) { | |
668 | struct sk_buff *skb; | |
669 | struct sock *pending; | |
670 | struct vsock_sock *vsk; | |
671 | ||
672 | vsk = vsock_sk(sk); | |
673 | pending = NULL; /* Compiler warning. */ | |
674 | ||
d021c344 AK |
675 | transport->release(vsk); |
676 | ||
677 | lock_sock(sk); | |
678 | sock_orphan(sk); | |
679 | sk->sk_shutdown = SHUTDOWN_MASK; | |
680 | ||
681 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) | |
682 | kfree_skb(skb); | |
683 | ||
684 | /* Clean up any sockets that never were accepted. */ | |
685 | while ((pending = vsock_dequeue_accept(sk)) != NULL) { | |
686 | __vsock_release(pending); | |
687 | sock_put(pending); | |
688 | } | |
689 | ||
690 | release_sock(sk); | |
691 | sock_put(sk); | |
692 | } | |
693 | } | |
694 | ||
695 | static void vsock_sk_destruct(struct sock *sk) | |
696 | { | |
697 | struct vsock_sock *vsk = vsock_sk(sk); | |
698 | ||
699 | transport->destruct(vsk); | |
700 | ||
701 | /* When clearing these addresses, there's no need to set the family and | |
702 | * possibly register the address family with the kernel. | |
703 | */ | |
704 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
705 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
706 | ||
707 | put_cred(vsk->owner); | |
708 | } | |
709 | ||
710 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
711 | { | |
712 | int err; | |
713 | ||
714 | err = sock_queue_rcv_skb(sk, skb); | |
715 | if (err) | |
716 | kfree_skb(skb); | |
717 | ||
718 | return err; | |
719 | } | |
720 | ||
721 | s64 vsock_stream_has_data(struct vsock_sock *vsk) | |
722 | { | |
723 | return transport->stream_has_data(vsk); | |
724 | } | |
725 | EXPORT_SYMBOL_GPL(vsock_stream_has_data); | |
726 | ||
727 | s64 vsock_stream_has_space(struct vsock_sock *vsk) | |
728 | { | |
729 | return transport->stream_has_space(vsk); | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(vsock_stream_has_space); | |
732 | ||
733 | static int vsock_release(struct socket *sock) | |
734 | { | |
735 | __vsock_release(sock->sk); | |
736 | sock->sk = NULL; | |
737 | sock->state = SS_FREE; | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
742 | static int | |
743 | vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
744 | { | |
745 | int err; | |
746 | struct sock *sk; | |
747 | struct sockaddr_vm *vm_addr; | |
748 | ||
749 | sk = sock->sk; | |
750 | ||
751 | if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) | |
752 | return -EINVAL; | |
753 | ||
754 | lock_sock(sk); | |
755 | err = __vsock_bind(sk, vm_addr); | |
756 | release_sock(sk); | |
757 | ||
758 | return err; | |
759 | } | |
760 | ||
761 | static int vsock_getname(struct socket *sock, | |
9b2c45d4 | 762 | struct sockaddr *addr, int peer) |
d021c344 AK |
763 | { |
764 | int err; | |
765 | struct sock *sk; | |
766 | struct vsock_sock *vsk; | |
767 | struct sockaddr_vm *vm_addr; | |
768 | ||
769 | sk = sock->sk; | |
770 | vsk = vsock_sk(sk); | |
771 | err = 0; | |
772 | ||
773 | lock_sock(sk); | |
774 | ||
775 | if (peer) { | |
776 | if (sock->state != SS_CONNECTED) { | |
777 | err = -ENOTCONN; | |
778 | goto out; | |
779 | } | |
780 | vm_addr = &vsk->remote_addr; | |
781 | } else { | |
782 | vm_addr = &vsk->local_addr; | |
783 | } | |
784 | ||
785 | if (!vm_addr) { | |
786 | err = -EINVAL; | |
787 | goto out; | |
788 | } | |
789 | ||
790 | /* sys_getsockname() and sys_getpeername() pass us a | |
791 | * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately | |
792 | * that macro is defined in socket.c instead of .h, so we hardcode its | |
793 | * value here. | |
794 | */ | |
795 | BUILD_BUG_ON(sizeof(*vm_addr) > 128); | |
796 | memcpy(addr, vm_addr, sizeof(*vm_addr)); | |
9b2c45d4 | 797 | err = sizeof(*vm_addr); |
d021c344 AK |
798 | |
799 | out: | |
800 | release_sock(sk); | |
801 | return err; | |
802 | } | |
803 | ||
804 | static int vsock_shutdown(struct socket *sock, int mode) | |
805 | { | |
806 | int err; | |
807 | struct sock *sk; | |
808 | ||
809 | /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses | |
810 | * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode | |
811 | * here like the other address families do. Note also that the | |
812 | * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), | |
813 | * which is what we want. | |
814 | */ | |
815 | mode++; | |
816 | ||
817 | if ((mode & ~SHUTDOWN_MASK) || !mode) | |
818 | return -EINVAL; | |
819 | ||
820 | /* If this is a STREAM socket and it is not connected then bail out | |
821 | * immediately. If it is a DGRAM socket then we must first kick the | |
822 | * socket so that it wakes up from any sleeping calls, for example | |
823 | * recv(), and then afterwards return the error. | |
824 | */ | |
825 | ||
826 | sk = sock->sk; | |
827 | if (sock->state == SS_UNCONNECTED) { | |
828 | err = -ENOTCONN; | |
829 | if (sk->sk_type == SOCK_STREAM) | |
830 | return err; | |
831 | } else { | |
832 | sock->state = SS_DISCONNECTING; | |
833 | err = 0; | |
834 | } | |
835 | ||
836 | /* Receive and send shutdowns are treated alike. */ | |
837 | mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); | |
838 | if (mode) { | |
839 | lock_sock(sk); | |
840 | sk->sk_shutdown |= mode; | |
841 | sk->sk_state_change(sk); | |
842 | release_sock(sk); | |
843 | ||
844 | if (sk->sk_type == SOCK_STREAM) { | |
845 | sock_reset_flag(sk, SOCK_DONE); | |
846 | vsock_send_shutdown(sk, mode); | |
847 | } | |
848 | } | |
849 | ||
850 | return err; | |
851 | } | |
852 | ||
a11e1d43 LT |
853 | static __poll_t vsock_poll(struct file *file, struct socket *sock, |
854 | poll_table *wait) | |
d021c344 | 855 | { |
a11e1d43 LT |
856 | struct sock *sk; |
857 | __poll_t mask; | |
858 | struct vsock_sock *vsk; | |
859 | ||
860 | sk = sock->sk; | |
861 | vsk = vsock_sk(sk); | |
862 | ||
863 | poll_wait(file, sk_sleep(sk), wait); | |
864 | mask = 0; | |
d021c344 AK |
865 | |
866 | if (sk->sk_err) | |
867 | /* Signify that there has been an error on this socket. */ | |
a9a08845 | 868 | mask |= EPOLLERR; |
d021c344 AK |
869 | |
870 | /* INET sockets treat local write shutdown and peer write shutdown as a | |
a9a08845 | 871 | * case of EPOLLHUP set. |
d021c344 AK |
872 | */ |
873 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || | |
874 | ((sk->sk_shutdown & SEND_SHUTDOWN) && | |
875 | (vsk->peer_shutdown & SEND_SHUTDOWN))) { | |
a9a08845 | 876 | mask |= EPOLLHUP; |
d021c344 AK |
877 | } |
878 | ||
879 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
880 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 881 | mask |= EPOLLRDHUP; |
d021c344 AK |
882 | } |
883 | ||
884 | if (sock->type == SOCK_DGRAM) { | |
885 | /* For datagram sockets we can read if there is something in | |
886 | * the queue and write as long as the socket isn't shutdown for | |
887 | * sending. | |
888 | */ | |
889 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
890 | (sk->sk_shutdown & RCV_SHUTDOWN)) { | |
a9a08845 | 891 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
892 | } |
893 | ||
894 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
a9a08845 | 895 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
d021c344 AK |
896 | |
897 | } else if (sock->type == SOCK_STREAM) { | |
898 | lock_sock(sk); | |
899 | ||
900 | /* Listening sockets that have connections in their accept | |
901 | * queue can be read. | |
902 | */ | |
3b4477d2 | 903 | if (sk->sk_state == TCP_LISTEN |
d021c344 | 904 | && !vsock_is_accept_queue_empty(sk)) |
a9a08845 | 905 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
906 | |
907 | /* If there is something in the queue then we can read. */ | |
908 | if (transport->stream_is_active(vsk) && | |
909 | !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
910 | bool data_ready_now = false; | |
911 | int ret = transport->notify_poll_in( | |
912 | vsk, 1, &data_ready_now); | |
913 | if (ret < 0) { | |
a9a08845 | 914 | mask |= EPOLLERR; |
d021c344 AK |
915 | } else { |
916 | if (data_ready_now) | |
a9a08845 | 917 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
918 | |
919 | } | |
920 | } | |
921 | ||
922 | /* Sockets whose connections have been closed, reset, or | |
923 | * terminated should also be considered read, and we check the | |
924 | * shutdown flag for that. | |
925 | */ | |
926 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
927 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 928 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
929 | } |
930 | ||
931 | /* Connected sockets that can produce data can be written. */ | |
3b4477d2 | 932 | if (sk->sk_state == TCP_ESTABLISHED) { |
d021c344 AK |
933 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
934 | bool space_avail_now = false; | |
935 | int ret = transport->notify_poll_out( | |
936 | vsk, 1, &space_avail_now); | |
937 | if (ret < 0) { | |
a9a08845 | 938 | mask |= EPOLLERR; |
d021c344 AK |
939 | } else { |
940 | if (space_avail_now) | |
a9a08845 | 941 | /* Remove EPOLLWRBAND since INET |
d021c344 AK |
942 | * sockets are not setting it. |
943 | */ | |
a9a08845 | 944 | mask |= EPOLLOUT | EPOLLWRNORM; |
d021c344 AK |
945 | |
946 | } | |
947 | } | |
948 | } | |
949 | ||
950 | /* Simulate INET socket poll behaviors, which sets | |
a9a08845 | 951 | * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, |
d021c344 AK |
952 | * but local send is not shutdown. |
953 | */ | |
ba3169fc | 954 | if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { |
d021c344 | 955 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) |
a9a08845 | 956 | mask |= EPOLLOUT | EPOLLWRNORM; |
d021c344 AK |
957 | |
958 | } | |
959 | ||
960 | release_sock(sk); | |
961 | } | |
962 | ||
963 | return mask; | |
964 | } | |
965 | ||
1b784140 YX |
966 | static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, |
967 | size_t len) | |
d021c344 AK |
968 | { |
969 | int err; | |
970 | struct sock *sk; | |
971 | struct vsock_sock *vsk; | |
972 | struct sockaddr_vm *remote_addr; | |
973 | ||
974 | if (msg->msg_flags & MSG_OOB) | |
975 | return -EOPNOTSUPP; | |
976 | ||
977 | /* For now, MSG_DONTWAIT is always assumed... */ | |
978 | err = 0; | |
979 | sk = sock->sk; | |
980 | vsk = vsock_sk(sk); | |
981 | ||
982 | lock_sock(sk); | |
983 | ||
b3a6dfe8 AH |
984 | err = vsock_auto_bind(vsk); |
985 | if (err) | |
986 | goto out; | |
d021c344 | 987 | |
d021c344 AK |
988 | |
989 | /* If the provided message contains an address, use that. Otherwise | |
990 | * fall back on the socket's remote handle (if it has been connected). | |
991 | */ | |
992 | if (msg->msg_name && | |
993 | vsock_addr_cast(msg->msg_name, msg->msg_namelen, | |
994 | &remote_addr) == 0) { | |
995 | /* Ensure this address is of the right type and is a valid | |
996 | * destination. | |
997 | */ | |
998 | ||
999 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
1000 | remote_addr->svm_cid = transport->get_local_cid(); | |
1001 | ||
1002 | if (!vsock_addr_bound(remote_addr)) { | |
1003 | err = -EINVAL; | |
1004 | goto out; | |
1005 | } | |
1006 | } else if (sock->state == SS_CONNECTED) { | |
1007 | remote_addr = &vsk->remote_addr; | |
1008 | ||
1009 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
1010 | remote_addr->svm_cid = transport->get_local_cid(); | |
1011 | ||
1012 | /* XXX Should connect() or this function ensure remote_addr is | |
1013 | * bound? | |
1014 | */ | |
1015 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1016 | err = -EINVAL; | |
1017 | goto out; | |
1018 | } | |
1019 | } else { | |
1020 | err = -EINVAL; | |
1021 | goto out; | |
1022 | } | |
1023 | ||
1024 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1025 | remote_addr->svm_port)) { | |
1026 | err = -EINVAL; | |
1027 | goto out; | |
1028 | } | |
1029 | ||
0f7db23a | 1030 | err = transport->dgram_enqueue(vsk, remote_addr, msg, len); |
d021c344 AK |
1031 | |
1032 | out: | |
1033 | release_sock(sk); | |
1034 | return err; | |
1035 | } | |
1036 | ||
1037 | static int vsock_dgram_connect(struct socket *sock, | |
1038 | struct sockaddr *addr, int addr_len, int flags) | |
1039 | { | |
1040 | int err; | |
1041 | struct sock *sk; | |
1042 | struct vsock_sock *vsk; | |
1043 | struct sockaddr_vm *remote_addr; | |
1044 | ||
1045 | sk = sock->sk; | |
1046 | vsk = vsock_sk(sk); | |
1047 | ||
1048 | err = vsock_addr_cast(addr, addr_len, &remote_addr); | |
1049 | if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { | |
1050 | lock_sock(sk); | |
1051 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, | |
1052 | VMADDR_PORT_ANY); | |
1053 | sock->state = SS_UNCONNECTED; | |
1054 | release_sock(sk); | |
1055 | return 0; | |
1056 | } else if (err != 0) | |
1057 | return -EINVAL; | |
1058 | ||
1059 | lock_sock(sk); | |
1060 | ||
b3a6dfe8 AH |
1061 | err = vsock_auto_bind(vsk); |
1062 | if (err) | |
1063 | goto out; | |
d021c344 AK |
1064 | |
1065 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1066 | remote_addr->svm_port)) { | |
1067 | err = -EINVAL; | |
1068 | goto out; | |
1069 | } | |
1070 | ||
1071 | memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); | |
1072 | sock->state = SS_CONNECTED; | |
1073 | ||
1074 | out: | |
1075 | release_sock(sk); | |
1076 | return err; | |
1077 | } | |
1078 | ||
1b784140 YX |
1079 | static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, |
1080 | size_t len, int flags) | |
d021c344 | 1081 | { |
1b784140 | 1082 | return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags); |
d021c344 AK |
1083 | } |
1084 | ||
1085 | static const struct proto_ops vsock_dgram_ops = { | |
1086 | .family = PF_VSOCK, | |
1087 | .owner = THIS_MODULE, | |
1088 | .release = vsock_release, | |
1089 | .bind = vsock_bind, | |
1090 | .connect = vsock_dgram_connect, | |
1091 | .socketpair = sock_no_socketpair, | |
1092 | .accept = sock_no_accept, | |
1093 | .getname = vsock_getname, | |
a11e1d43 | 1094 | .poll = vsock_poll, |
d021c344 AK |
1095 | .ioctl = sock_no_ioctl, |
1096 | .listen = sock_no_listen, | |
1097 | .shutdown = vsock_shutdown, | |
1098 | .setsockopt = sock_no_setsockopt, | |
1099 | .getsockopt = sock_no_getsockopt, | |
1100 | .sendmsg = vsock_dgram_sendmsg, | |
1101 | .recvmsg = vsock_dgram_recvmsg, | |
1102 | .mmap = sock_no_mmap, | |
1103 | .sendpage = sock_no_sendpage, | |
1104 | }; | |
1105 | ||
380feae0 PT |
1106 | static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) |
1107 | { | |
1108 | if (!transport->cancel_pkt) | |
1109 | return -EOPNOTSUPP; | |
1110 | ||
1111 | return transport->cancel_pkt(vsk); | |
1112 | } | |
1113 | ||
d021c344 AK |
1114 | static void vsock_connect_timeout(struct work_struct *work) |
1115 | { | |
1116 | struct sock *sk; | |
1117 | struct vsock_sock *vsk; | |
380feae0 | 1118 | int cancel = 0; |
d021c344 | 1119 | |
455f05ec | 1120 | vsk = container_of(work, struct vsock_sock, connect_work.work); |
d021c344 AK |
1121 | sk = sk_vsock(vsk); |
1122 | ||
1123 | lock_sock(sk); | |
3b4477d2 | 1124 | if (sk->sk_state == TCP_SYN_SENT && |
d021c344 | 1125 | (sk->sk_shutdown != SHUTDOWN_MASK)) { |
3b4477d2 | 1126 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
1127 | sk->sk_err = ETIMEDOUT; |
1128 | sk->sk_error_report(sk); | |
380feae0 | 1129 | cancel = 1; |
d021c344 AK |
1130 | } |
1131 | release_sock(sk); | |
380feae0 PT |
1132 | if (cancel) |
1133 | vsock_transport_cancel_pkt(vsk); | |
d021c344 AK |
1134 | |
1135 | sock_put(sk); | |
1136 | } | |
1137 | ||
1138 | static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, | |
1139 | int addr_len, int flags) | |
1140 | { | |
1141 | int err; | |
1142 | struct sock *sk; | |
1143 | struct vsock_sock *vsk; | |
1144 | struct sockaddr_vm *remote_addr; | |
1145 | long timeout; | |
1146 | DEFINE_WAIT(wait); | |
1147 | ||
1148 | err = 0; | |
1149 | sk = sock->sk; | |
1150 | vsk = vsock_sk(sk); | |
1151 | ||
1152 | lock_sock(sk); | |
1153 | ||
1154 | /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ | |
1155 | switch (sock->state) { | |
1156 | case SS_CONNECTED: | |
1157 | err = -EISCONN; | |
1158 | goto out; | |
1159 | case SS_DISCONNECTING: | |
1160 | err = -EINVAL; | |
1161 | goto out; | |
1162 | case SS_CONNECTING: | |
1163 | /* This continues on so we can move sock into the SS_CONNECTED | |
1164 | * state once the connection has completed (at which point err | |
1165 | * will be set to zero also). Otherwise, we will either wait | |
1166 | * for the connection or return -EALREADY should this be a | |
1167 | * non-blocking call. | |
1168 | */ | |
1169 | err = -EALREADY; | |
1170 | break; | |
1171 | default: | |
3b4477d2 | 1172 | if ((sk->sk_state == TCP_LISTEN) || |
d021c344 AK |
1173 | vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { |
1174 | err = -EINVAL; | |
1175 | goto out; | |
1176 | } | |
1177 | ||
1178 | /* The hypervisor and well-known contexts do not have socket | |
1179 | * endpoints. | |
1180 | */ | |
1181 | if (!transport->stream_allow(remote_addr->svm_cid, | |
1182 | remote_addr->svm_port)) { | |
1183 | err = -ENETUNREACH; | |
1184 | goto out; | |
1185 | } | |
1186 | ||
1187 | /* Set the remote address that we are connecting to. */ | |
1188 | memcpy(&vsk->remote_addr, remote_addr, | |
1189 | sizeof(vsk->remote_addr)); | |
1190 | ||
b3a6dfe8 AH |
1191 | err = vsock_auto_bind(vsk); |
1192 | if (err) | |
1193 | goto out; | |
d021c344 | 1194 | |
3b4477d2 | 1195 | sk->sk_state = TCP_SYN_SENT; |
d021c344 AK |
1196 | |
1197 | err = transport->connect(vsk); | |
1198 | if (err < 0) | |
1199 | goto out; | |
1200 | ||
1201 | /* Mark sock as connecting and set the error code to in | |
1202 | * progress in case this is a non-blocking connect. | |
1203 | */ | |
1204 | sock->state = SS_CONNECTING; | |
1205 | err = -EINPROGRESS; | |
1206 | } | |
1207 | ||
1208 | /* The receive path will handle all communication until we are able to | |
1209 | * enter the connected state. Here we wait for the connection to be | |
1210 | * completed or a notification of an error. | |
1211 | */ | |
1212 | timeout = vsk->connect_timeout; | |
1213 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1214 | ||
3b4477d2 | 1215 | while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { |
d021c344 AK |
1216 | if (flags & O_NONBLOCK) { |
1217 | /* If we're not going to block, we schedule a timeout | |
1218 | * function to generate a timeout on the connection | |
1219 | * attempt, in case the peer doesn't respond in a | |
1220 | * timely manner. We hold on to the socket until the | |
1221 | * timeout fires. | |
1222 | */ | |
1223 | sock_hold(sk); | |
455f05ec | 1224 | schedule_delayed_work(&vsk->connect_work, timeout); |
d021c344 AK |
1225 | |
1226 | /* Skip ahead to preserve error code set above. */ | |
1227 | goto out_wait; | |
1228 | } | |
1229 | ||
1230 | release_sock(sk); | |
1231 | timeout = schedule_timeout(timeout); | |
1232 | lock_sock(sk); | |
1233 | ||
1234 | if (signal_pending(current)) { | |
1235 | err = sock_intr_errno(timeout); | |
3b4477d2 | 1236 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 | 1237 | sock->state = SS_UNCONNECTED; |
380feae0 | 1238 | vsock_transport_cancel_pkt(vsk); |
f7f9b5e7 | 1239 | goto out_wait; |
d021c344 AK |
1240 | } else if (timeout == 0) { |
1241 | err = -ETIMEDOUT; | |
3b4477d2 | 1242 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 | 1243 | sock->state = SS_UNCONNECTED; |
380feae0 | 1244 | vsock_transport_cancel_pkt(vsk); |
f7f9b5e7 | 1245 | goto out_wait; |
d021c344 AK |
1246 | } |
1247 | ||
1248 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1249 | } | |
1250 | ||
1251 | if (sk->sk_err) { | |
1252 | err = -sk->sk_err; | |
3b4477d2 | 1253 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 CI |
1254 | sock->state = SS_UNCONNECTED; |
1255 | } else { | |
d021c344 | 1256 | err = 0; |
f7f9b5e7 | 1257 | } |
d021c344 AK |
1258 | |
1259 | out_wait: | |
1260 | finish_wait(sk_sleep(sk), &wait); | |
1261 | out: | |
1262 | release_sock(sk); | |
1263 | return err; | |
d021c344 AK |
1264 | } |
1265 | ||
cdfbabfb DH |
1266 | static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, |
1267 | bool kern) | |
d021c344 AK |
1268 | { |
1269 | struct sock *listener; | |
1270 | int err; | |
1271 | struct sock *connected; | |
1272 | struct vsock_sock *vconnected; | |
1273 | long timeout; | |
1274 | DEFINE_WAIT(wait); | |
1275 | ||
1276 | err = 0; | |
1277 | listener = sock->sk; | |
1278 | ||
1279 | lock_sock(listener); | |
1280 | ||
1281 | if (sock->type != SOCK_STREAM) { | |
1282 | err = -EOPNOTSUPP; | |
1283 | goto out; | |
1284 | } | |
1285 | ||
3b4477d2 | 1286 | if (listener->sk_state != TCP_LISTEN) { |
d021c344 AK |
1287 | err = -EINVAL; |
1288 | goto out; | |
1289 | } | |
1290 | ||
1291 | /* Wait for children sockets to appear; these are the new sockets | |
1292 | * created upon connection establishment. | |
1293 | */ | |
1294 | timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); | |
1295 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1296 | ||
1297 | while ((connected = vsock_dequeue_accept(listener)) == NULL && | |
1298 | listener->sk_err == 0) { | |
1299 | release_sock(listener); | |
1300 | timeout = schedule_timeout(timeout); | |
f7f9b5e7 | 1301 | finish_wait(sk_sleep(listener), &wait); |
d021c344 AK |
1302 | lock_sock(listener); |
1303 | ||
1304 | if (signal_pending(current)) { | |
1305 | err = sock_intr_errno(timeout); | |
f7f9b5e7 | 1306 | goto out; |
d021c344 AK |
1307 | } else if (timeout == 0) { |
1308 | err = -EAGAIN; | |
f7f9b5e7 | 1309 | goto out; |
d021c344 AK |
1310 | } |
1311 | ||
1312 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1313 | } | |
f7f9b5e7 | 1314 | finish_wait(sk_sleep(listener), &wait); |
d021c344 AK |
1315 | |
1316 | if (listener->sk_err) | |
1317 | err = -listener->sk_err; | |
1318 | ||
1319 | if (connected) { | |
1320 | listener->sk_ack_backlog--; | |
1321 | ||
4192f672 | 1322 | lock_sock_nested(connected, SINGLE_DEPTH_NESTING); |
d021c344 AK |
1323 | vconnected = vsock_sk(connected); |
1324 | ||
1325 | /* If the listener socket has received an error, then we should | |
1326 | * reject this socket and return. Note that we simply mark the | |
1327 | * socket rejected, drop our reference, and let the cleanup | |
1328 | * function handle the cleanup; the fact that we found it in | |
1329 | * the listener's accept queue guarantees that the cleanup | |
1330 | * function hasn't run yet. | |
1331 | */ | |
1332 | if (err) { | |
1333 | vconnected->rejected = true; | |
f7f9b5e7 CI |
1334 | } else { |
1335 | newsock->state = SS_CONNECTED; | |
1336 | sock_graft(connected, newsock); | |
d021c344 AK |
1337 | } |
1338 | ||
d021c344 AK |
1339 | release_sock(connected); |
1340 | sock_put(connected); | |
1341 | } | |
1342 | ||
d021c344 AK |
1343 | out: |
1344 | release_sock(listener); | |
1345 | return err; | |
1346 | } | |
1347 | ||
1348 | static int vsock_listen(struct socket *sock, int backlog) | |
1349 | { | |
1350 | int err; | |
1351 | struct sock *sk; | |
1352 | struct vsock_sock *vsk; | |
1353 | ||
1354 | sk = sock->sk; | |
1355 | ||
1356 | lock_sock(sk); | |
1357 | ||
1358 | if (sock->type != SOCK_STREAM) { | |
1359 | err = -EOPNOTSUPP; | |
1360 | goto out; | |
1361 | } | |
1362 | ||
1363 | if (sock->state != SS_UNCONNECTED) { | |
1364 | err = -EINVAL; | |
1365 | goto out; | |
1366 | } | |
1367 | ||
1368 | vsk = vsock_sk(sk); | |
1369 | ||
1370 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1371 | err = -EINVAL; | |
1372 | goto out; | |
1373 | } | |
1374 | ||
1375 | sk->sk_max_ack_backlog = backlog; | |
3b4477d2 | 1376 | sk->sk_state = TCP_LISTEN; |
d021c344 AK |
1377 | |
1378 | err = 0; | |
1379 | ||
1380 | out: | |
1381 | release_sock(sk); | |
1382 | return err; | |
1383 | } | |
1384 | ||
1385 | static int vsock_stream_setsockopt(struct socket *sock, | |
1386 | int level, | |
1387 | int optname, | |
1388 | char __user *optval, | |
1389 | unsigned int optlen) | |
1390 | { | |
1391 | int err; | |
1392 | struct sock *sk; | |
1393 | struct vsock_sock *vsk; | |
1394 | u64 val; | |
1395 | ||
1396 | if (level != AF_VSOCK) | |
1397 | return -ENOPROTOOPT; | |
1398 | ||
1399 | #define COPY_IN(_v) \ | |
1400 | do { \ | |
1401 | if (optlen < sizeof(_v)) { \ | |
1402 | err = -EINVAL; \ | |
1403 | goto exit; \ | |
1404 | } \ | |
1405 | if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ | |
1406 | err = -EFAULT; \ | |
1407 | goto exit; \ | |
1408 | } \ | |
1409 | } while (0) | |
1410 | ||
1411 | err = 0; | |
1412 | sk = sock->sk; | |
1413 | vsk = vsock_sk(sk); | |
1414 | ||
1415 | lock_sock(sk); | |
1416 | ||
1417 | switch (optname) { | |
1418 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1419 | COPY_IN(val); | |
1420 | transport->set_buffer_size(vsk, val); | |
1421 | break; | |
1422 | ||
1423 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1424 | COPY_IN(val); | |
1425 | transport->set_max_buffer_size(vsk, val); | |
1426 | break; | |
1427 | ||
1428 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1429 | COPY_IN(val); | |
1430 | transport->set_min_buffer_size(vsk, val); | |
1431 | break; | |
1432 | ||
1433 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
fe0c72f3 | 1434 | struct __kernel_old_timeval tv; |
d021c344 AK |
1435 | COPY_IN(tv); |
1436 | if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && | |
1437 | tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { | |
1438 | vsk->connect_timeout = tv.tv_sec * HZ + | |
1439 | DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); | |
1440 | if (vsk->connect_timeout == 0) | |
1441 | vsk->connect_timeout = | |
1442 | VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
1443 | ||
1444 | } else { | |
1445 | err = -ERANGE; | |
1446 | } | |
1447 | break; | |
1448 | } | |
1449 | ||
1450 | default: | |
1451 | err = -ENOPROTOOPT; | |
1452 | break; | |
1453 | } | |
1454 | ||
1455 | #undef COPY_IN | |
1456 | ||
1457 | exit: | |
1458 | release_sock(sk); | |
1459 | return err; | |
1460 | } | |
1461 | ||
1462 | static int vsock_stream_getsockopt(struct socket *sock, | |
1463 | int level, int optname, | |
1464 | char __user *optval, | |
1465 | int __user *optlen) | |
1466 | { | |
1467 | int err; | |
1468 | int len; | |
1469 | struct sock *sk; | |
1470 | struct vsock_sock *vsk; | |
1471 | u64 val; | |
1472 | ||
1473 | if (level != AF_VSOCK) | |
1474 | return -ENOPROTOOPT; | |
1475 | ||
1476 | err = get_user(len, optlen); | |
1477 | if (err != 0) | |
1478 | return err; | |
1479 | ||
1480 | #define COPY_OUT(_v) \ | |
1481 | do { \ | |
1482 | if (len < sizeof(_v)) \ | |
1483 | return -EINVAL; \ | |
1484 | \ | |
1485 | len = sizeof(_v); \ | |
1486 | if (copy_to_user(optval, &_v, len) != 0) \ | |
1487 | return -EFAULT; \ | |
1488 | \ | |
1489 | } while (0) | |
1490 | ||
1491 | err = 0; | |
1492 | sk = sock->sk; | |
1493 | vsk = vsock_sk(sk); | |
1494 | ||
1495 | switch (optname) { | |
1496 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1497 | val = transport->get_buffer_size(vsk); | |
1498 | COPY_OUT(val); | |
1499 | break; | |
1500 | ||
1501 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1502 | val = transport->get_max_buffer_size(vsk); | |
1503 | COPY_OUT(val); | |
1504 | break; | |
1505 | ||
1506 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1507 | val = transport->get_min_buffer_size(vsk); | |
1508 | COPY_OUT(val); | |
1509 | break; | |
1510 | ||
1511 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
fe0c72f3 | 1512 | struct __kernel_old_timeval tv; |
d021c344 AK |
1513 | tv.tv_sec = vsk->connect_timeout / HZ; |
1514 | tv.tv_usec = | |
1515 | (vsk->connect_timeout - | |
1516 | tv.tv_sec * HZ) * (1000000 / HZ); | |
1517 | COPY_OUT(tv); | |
1518 | break; | |
1519 | } | |
1520 | default: | |
1521 | return -ENOPROTOOPT; | |
1522 | } | |
1523 | ||
1524 | err = put_user(len, optlen); | |
1525 | if (err != 0) | |
1526 | return -EFAULT; | |
1527 | ||
1528 | #undef COPY_OUT | |
1529 | ||
1530 | return 0; | |
1531 | } | |
1532 | ||
1b784140 YX |
1533 | static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, |
1534 | size_t len) | |
d021c344 AK |
1535 | { |
1536 | struct sock *sk; | |
1537 | struct vsock_sock *vsk; | |
1538 | ssize_t total_written; | |
1539 | long timeout; | |
1540 | int err; | |
1541 | struct vsock_transport_send_notify_data send_data; | |
499fde66 | 1542 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
d021c344 AK |
1543 | |
1544 | sk = sock->sk; | |
1545 | vsk = vsock_sk(sk); | |
1546 | total_written = 0; | |
1547 | err = 0; | |
1548 | ||
1549 | if (msg->msg_flags & MSG_OOB) | |
1550 | return -EOPNOTSUPP; | |
1551 | ||
1552 | lock_sock(sk); | |
1553 | ||
1554 | /* Callers should not provide a destination with stream sockets. */ | |
1555 | if (msg->msg_namelen) { | |
3b4477d2 | 1556 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; |
d021c344 AK |
1557 | goto out; |
1558 | } | |
1559 | ||
1560 | /* Send data only if both sides are not shutdown in the direction. */ | |
1561 | if (sk->sk_shutdown & SEND_SHUTDOWN || | |
1562 | vsk->peer_shutdown & RCV_SHUTDOWN) { | |
1563 | err = -EPIPE; | |
1564 | goto out; | |
1565 | } | |
1566 | ||
3b4477d2 | 1567 | if (sk->sk_state != TCP_ESTABLISHED || |
d021c344 AK |
1568 | !vsock_addr_bound(&vsk->local_addr)) { |
1569 | err = -ENOTCONN; | |
1570 | goto out; | |
1571 | } | |
1572 | ||
1573 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1574 | err = -EDESTADDRREQ; | |
1575 | goto out; | |
1576 | } | |
1577 | ||
1578 | /* Wait for room in the produce queue to enqueue our user's data. */ | |
1579 | timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1580 | ||
1581 | err = transport->notify_send_init(vsk, &send_data); | |
1582 | if (err < 0) | |
1583 | goto out; | |
1584 | ||
d021c344 AK |
1585 | while (total_written < len) { |
1586 | ssize_t written; | |
1587 | ||
499fde66 | 1588 | add_wait_queue(sk_sleep(sk), &wait); |
d021c344 AK |
1589 | while (vsock_stream_has_space(vsk) == 0 && |
1590 | sk->sk_err == 0 && | |
1591 | !(sk->sk_shutdown & SEND_SHUTDOWN) && | |
1592 | !(vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1593 | ||
1594 | /* Don't wait for non-blocking sockets. */ | |
1595 | if (timeout == 0) { | |
1596 | err = -EAGAIN; | |
499fde66 | 1597 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1598 | goto out_err; |
d021c344 AK |
1599 | } |
1600 | ||
1601 | err = transport->notify_send_pre_block(vsk, &send_data); | |
f7f9b5e7 | 1602 | if (err < 0) { |
499fde66 | 1603 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 CI |
1604 | goto out_err; |
1605 | } | |
d021c344 AK |
1606 | |
1607 | release_sock(sk); | |
499fde66 | 1608 | timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); |
d021c344 AK |
1609 | lock_sock(sk); |
1610 | if (signal_pending(current)) { | |
1611 | err = sock_intr_errno(timeout); | |
499fde66 | 1612 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1613 | goto out_err; |
d021c344 AK |
1614 | } else if (timeout == 0) { |
1615 | err = -EAGAIN; | |
499fde66 | 1616 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1617 | goto out_err; |
d021c344 | 1618 | } |
d021c344 | 1619 | } |
499fde66 | 1620 | remove_wait_queue(sk_sleep(sk), &wait); |
d021c344 AK |
1621 | |
1622 | /* These checks occur both as part of and after the loop | |
1623 | * conditional since we need to check before and after | |
1624 | * sleeping. | |
1625 | */ | |
1626 | if (sk->sk_err) { | |
1627 | err = -sk->sk_err; | |
f7f9b5e7 | 1628 | goto out_err; |
d021c344 AK |
1629 | } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || |
1630 | (vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1631 | err = -EPIPE; | |
f7f9b5e7 | 1632 | goto out_err; |
d021c344 AK |
1633 | } |
1634 | ||
1635 | err = transport->notify_send_pre_enqueue(vsk, &send_data); | |
1636 | if (err < 0) | |
f7f9b5e7 | 1637 | goto out_err; |
d021c344 AK |
1638 | |
1639 | /* Note that enqueue will only write as many bytes as are free | |
1640 | * in the produce queue, so we don't need to ensure len is | |
1641 | * smaller than the queue size. It is the caller's | |
1642 | * responsibility to check how many bytes we were able to send. | |
1643 | */ | |
1644 | ||
1645 | written = transport->stream_enqueue( | |
0f7db23a | 1646 | vsk, msg, |
d021c344 AK |
1647 | len - total_written); |
1648 | if (written < 0) { | |
1649 | err = -ENOMEM; | |
f7f9b5e7 | 1650 | goto out_err; |
d021c344 AK |
1651 | } |
1652 | ||
1653 | total_written += written; | |
1654 | ||
1655 | err = transport->notify_send_post_enqueue( | |
1656 | vsk, written, &send_data); | |
1657 | if (err < 0) | |
f7f9b5e7 | 1658 | goto out_err; |
d021c344 AK |
1659 | |
1660 | } | |
1661 | ||
f7f9b5e7 | 1662 | out_err: |
d021c344 AK |
1663 | if (total_written > 0) |
1664 | err = total_written; | |
d021c344 AK |
1665 | out: |
1666 | release_sock(sk); | |
1667 | return err; | |
1668 | } | |
1669 | ||
1670 | ||
1671 | static int | |
1b784140 YX |
1672 | vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
1673 | int flags) | |
d021c344 AK |
1674 | { |
1675 | struct sock *sk; | |
1676 | struct vsock_sock *vsk; | |
1677 | int err; | |
1678 | size_t target; | |
1679 | ssize_t copied; | |
1680 | long timeout; | |
1681 | struct vsock_transport_recv_notify_data recv_data; | |
1682 | ||
1683 | DEFINE_WAIT(wait); | |
1684 | ||
1685 | sk = sock->sk; | |
1686 | vsk = vsock_sk(sk); | |
1687 | err = 0; | |
1688 | ||
1689 | lock_sock(sk); | |
1690 | ||
3b4477d2 | 1691 | if (sk->sk_state != TCP_ESTABLISHED) { |
d021c344 AK |
1692 | /* Recvmsg is supposed to return 0 if a peer performs an |
1693 | * orderly shutdown. Differentiate between that case and when a | |
1694 | * peer has not connected or a local shutdown occured with the | |
1695 | * SOCK_DONE flag. | |
1696 | */ | |
1697 | if (sock_flag(sk, SOCK_DONE)) | |
1698 | err = 0; | |
1699 | else | |
1700 | err = -ENOTCONN; | |
1701 | ||
1702 | goto out; | |
1703 | } | |
1704 | ||
1705 | if (flags & MSG_OOB) { | |
1706 | err = -EOPNOTSUPP; | |
1707 | goto out; | |
1708 | } | |
1709 | ||
1710 | /* We don't check peer_shutdown flag here since peer may actually shut | |
1711 | * down, but there can be data in the queue that a local socket can | |
1712 | * receive. | |
1713 | */ | |
1714 | if (sk->sk_shutdown & RCV_SHUTDOWN) { | |
1715 | err = 0; | |
1716 | goto out; | |
1717 | } | |
1718 | ||
1719 | /* It is valid on Linux to pass in a zero-length receive buffer. This | |
1720 | * is not an error. We may as well bail out now. | |
1721 | */ | |
1722 | if (!len) { | |
1723 | err = 0; | |
1724 | goto out; | |
1725 | } | |
1726 | ||
1727 | /* We must not copy less than target bytes into the user's buffer | |
1728 | * before returning successfully, so we wait for the consume queue to | |
1729 | * have that much data to consume before dequeueing. Note that this | |
1730 | * makes it impossible to handle cases where target is greater than the | |
1731 | * queue size. | |
1732 | */ | |
1733 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1734 | if (target >= transport->stream_rcvhiwat(vsk)) { | |
1735 | err = -ENOMEM; | |
1736 | goto out; | |
1737 | } | |
1738 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1739 | copied = 0; | |
1740 | ||
1741 | err = transport->notify_recv_init(vsk, target, &recv_data); | |
1742 | if (err < 0) | |
1743 | goto out; | |
1744 | ||
d021c344 AK |
1745 | |
1746 | while (1) { | |
f7f9b5e7 | 1747 | s64 ready; |
d021c344 | 1748 | |
f7f9b5e7 CI |
1749 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1750 | ready = vsock_stream_has_data(vsk); | |
d021c344 | 1751 | |
f7f9b5e7 CI |
1752 | if (ready == 0) { |
1753 | if (sk->sk_err != 0 || | |
1754 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1755 | (vsk->peer_shutdown & SEND_SHUTDOWN)) { | |
1756 | finish_wait(sk_sleep(sk), &wait); | |
1757 | break; | |
1758 | } | |
1759 | /* Don't wait for non-blocking sockets. */ | |
1760 | if (timeout == 0) { | |
1761 | err = -EAGAIN; | |
1762 | finish_wait(sk_sleep(sk), &wait); | |
1763 | break; | |
1764 | } | |
1765 | ||
1766 | err = transport->notify_recv_pre_block( | |
1767 | vsk, target, &recv_data); | |
1768 | if (err < 0) { | |
1769 | finish_wait(sk_sleep(sk), &wait); | |
1770 | break; | |
1771 | } | |
1772 | release_sock(sk); | |
1773 | timeout = schedule_timeout(timeout); | |
1774 | lock_sock(sk); | |
1775 | ||
1776 | if (signal_pending(current)) { | |
1777 | err = sock_intr_errno(timeout); | |
1778 | finish_wait(sk_sleep(sk), &wait); | |
1779 | break; | |
1780 | } else if (timeout == 0) { | |
1781 | err = -EAGAIN; | |
1782 | finish_wait(sk_sleep(sk), &wait); | |
1783 | break; | |
1784 | } | |
1785 | } else { | |
d021c344 AK |
1786 | ssize_t read; |
1787 | ||
f7f9b5e7 CI |
1788 | finish_wait(sk_sleep(sk), &wait); |
1789 | ||
1790 | if (ready < 0) { | |
1791 | /* Invalid queue pair content. XXX This should | |
1792 | * be changed to a connection reset in a later | |
1793 | * change. | |
1794 | */ | |
1795 | ||
1796 | err = -ENOMEM; | |
1797 | goto out; | |
1798 | } | |
1799 | ||
d021c344 AK |
1800 | err = transport->notify_recv_pre_dequeue( |
1801 | vsk, target, &recv_data); | |
1802 | if (err < 0) | |
1803 | break; | |
1804 | ||
1805 | read = transport->stream_dequeue( | |
0f7db23a | 1806 | vsk, msg, |
d021c344 AK |
1807 | len - copied, flags); |
1808 | if (read < 0) { | |
1809 | err = -ENOMEM; | |
1810 | break; | |
1811 | } | |
1812 | ||
1813 | copied += read; | |
1814 | ||
1815 | err = transport->notify_recv_post_dequeue( | |
1816 | vsk, target, read, | |
1817 | !(flags & MSG_PEEK), &recv_data); | |
1818 | if (err < 0) | |
f7f9b5e7 | 1819 | goto out; |
d021c344 AK |
1820 | |
1821 | if (read >= target || flags & MSG_PEEK) | |
1822 | break; | |
1823 | ||
1824 | target -= read; | |
d021c344 AK |
1825 | } |
1826 | } | |
1827 | ||
1828 | if (sk->sk_err) | |
1829 | err = -sk->sk_err; | |
1830 | else if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1831 | err = 0; | |
1832 | ||
dedc58e0 | 1833 | if (copied > 0) |
d021c344 | 1834 | err = copied; |
d021c344 | 1835 | |
d021c344 AK |
1836 | out: |
1837 | release_sock(sk); | |
1838 | return err; | |
1839 | } | |
1840 | ||
1841 | static const struct proto_ops vsock_stream_ops = { | |
1842 | .family = PF_VSOCK, | |
1843 | .owner = THIS_MODULE, | |
1844 | .release = vsock_release, | |
1845 | .bind = vsock_bind, | |
1846 | .connect = vsock_stream_connect, | |
1847 | .socketpair = sock_no_socketpair, | |
1848 | .accept = vsock_accept, | |
1849 | .getname = vsock_getname, | |
a11e1d43 | 1850 | .poll = vsock_poll, |
d021c344 AK |
1851 | .ioctl = sock_no_ioctl, |
1852 | .listen = vsock_listen, | |
1853 | .shutdown = vsock_shutdown, | |
1854 | .setsockopt = vsock_stream_setsockopt, | |
1855 | .getsockopt = vsock_stream_getsockopt, | |
1856 | .sendmsg = vsock_stream_sendmsg, | |
1857 | .recvmsg = vsock_stream_recvmsg, | |
1858 | .mmap = sock_no_mmap, | |
1859 | .sendpage = sock_no_sendpage, | |
1860 | }; | |
1861 | ||
1862 | static int vsock_create(struct net *net, struct socket *sock, | |
1863 | int protocol, int kern) | |
1864 | { | |
1865 | if (!sock) | |
1866 | return -EINVAL; | |
1867 | ||
6cf1c5fc | 1868 | if (protocol && protocol != PF_VSOCK) |
d021c344 AK |
1869 | return -EPROTONOSUPPORT; |
1870 | ||
1871 | switch (sock->type) { | |
1872 | case SOCK_DGRAM: | |
1873 | sock->ops = &vsock_dgram_ops; | |
1874 | break; | |
1875 | case SOCK_STREAM: | |
1876 | sock->ops = &vsock_stream_ops; | |
1877 | break; | |
1878 | default: | |
1879 | return -ESOCKTNOSUPPORT; | |
1880 | } | |
1881 | ||
1882 | sock->state = SS_UNCONNECTED; | |
1883 | ||
11aa9c28 | 1884 | return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM; |
d021c344 AK |
1885 | } |
1886 | ||
1887 | static const struct net_proto_family vsock_family_ops = { | |
1888 | .family = AF_VSOCK, | |
1889 | .create = vsock_create, | |
1890 | .owner = THIS_MODULE, | |
1891 | }; | |
1892 | ||
1893 | static long vsock_dev_do_ioctl(struct file *filp, | |
1894 | unsigned int cmd, void __user *ptr) | |
1895 | { | |
1896 | u32 __user *p = ptr; | |
1897 | int retval = 0; | |
1898 | ||
1899 | switch (cmd) { | |
1900 | case IOCTL_VM_SOCKETS_GET_LOCAL_CID: | |
1901 | if (put_user(transport->get_local_cid(), p) != 0) | |
1902 | retval = -EFAULT; | |
1903 | break; | |
1904 | ||
1905 | default: | |
1906 | pr_err("Unknown ioctl %d\n", cmd); | |
1907 | retval = -EINVAL; | |
1908 | } | |
1909 | ||
1910 | return retval; | |
1911 | } | |
1912 | ||
1913 | static long vsock_dev_ioctl(struct file *filp, | |
1914 | unsigned int cmd, unsigned long arg) | |
1915 | { | |
1916 | return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); | |
1917 | } | |
1918 | ||
1919 | #ifdef CONFIG_COMPAT | |
1920 | static long vsock_dev_compat_ioctl(struct file *filp, | |
1921 | unsigned int cmd, unsigned long arg) | |
1922 | { | |
1923 | return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); | |
1924 | } | |
1925 | #endif | |
1926 | ||
1927 | static const struct file_operations vsock_device_ops = { | |
1928 | .owner = THIS_MODULE, | |
1929 | .unlocked_ioctl = vsock_dev_ioctl, | |
1930 | #ifdef CONFIG_COMPAT | |
1931 | .compat_ioctl = vsock_dev_compat_ioctl, | |
1932 | #endif | |
1933 | .open = nonseekable_open, | |
1934 | }; | |
1935 | ||
1936 | static struct miscdevice vsock_device = { | |
1937 | .name = "vsock", | |
d021c344 AK |
1938 | .fops = &vsock_device_ops, |
1939 | }; | |
1940 | ||
2c4a336e | 1941 | int __vsock_core_init(const struct vsock_transport *t, struct module *owner) |
d021c344 | 1942 | { |
2c4a336e AK |
1943 | int err = mutex_lock_interruptible(&vsock_register_mutex); |
1944 | ||
1945 | if (err) | |
1946 | return err; | |
1947 | ||
1948 | if (transport) { | |
1949 | err = -EBUSY; | |
1950 | goto err_busy; | |
1951 | } | |
1952 | ||
1953 | /* Transport must be the owner of the protocol so that it can't | |
1954 | * unload while there are open sockets. | |
1955 | */ | |
1956 | vsock_proto.owner = owner; | |
1957 | transport = t; | |
d021c344 | 1958 | |
6ad0b2f7 | 1959 | vsock_device.minor = MISC_DYNAMIC_MINOR; |
d021c344 AK |
1960 | err = misc_register(&vsock_device); |
1961 | if (err) { | |
1962 | pr_err("Failed to register misc device\n"); | |
f6a835bb | 1963 | goto err_reset_transport; |
d021c344 AK |
1964 | } |
1965 | ||
1966 | err = proto_register(&vsock_proto, 1); /* we want our slab */ | |
1967 | if (err) { | |
1968 | pr_err("Cannot register vsock protocol\n"); | |
f6a835bb | 1969 | goto err_deregister_misc; |
d021c344 AK |
1970 | } |
1971 | ||
1972 | err = sock_register(&vsock_family_ops); | |
1973 | if (err) { | |
1974 | pr_err("could not register af_vsock (%d) address family: %d\n", | |
1975 | AF_VSOCK, err); | |
1976 | goto err_unregister_proto; | |
1977 | } | |
1978 | ||
2c4a336e | 1979 | mutex_unlock(&vsock_register_mutex); |
d021c344 AK |
1980 | return 0; |
1981 | ||
1982 | err_unregister_proto: | |
1983 | proto_unregister(&vsock_proto); | |
f6a835bb | 1984 | err_deregister_misc: |
d021c344 | 1985 | misc_deregister(&vsock_device); |
f6a835bb | 1986 | err_reset_transport: |
2c4a336e AK |
1987 | transport = NULL; |
1988 | err_busy: | |
d021c344 | 1989 | mutex_unlock(&vsock_register_mutex); |
2c4a336e | 1990 | return err; |
d021c344 | 1991 | } |
2c4a336e | 1992 | EXPORT_SYMBOL_GPL(__vsock_core_init); |
d021c344 AK |
1993 | |
1994 | void vsock_core_exit(void) | |
1995 | { | |
1996 | mutex_lock(&vsock_register_mutex); | |
1997 | ||
1998 | misc_deregister(&vsock_device); | |
1999 | sock_unregister(AF_VSOCK); | |
2000 | proto_unregister(&vsock_proto); | |
2001 | ||
2002 | /* We do not want the assignment below re-ordered. */ | |
2003 | mb(); | |
2004 | transport = NULL; | |
2005 | ||
2006 | mutex_unlock(&vsock_register_mutex); | |
2007 | } | |
2008 | EXPORT_SYMBOL_GPL(vsock_core_exit); | |
2009 | ||
0b01aeb3 SH |
2010 | const struct vsock_transport *vsock_core_get_transport(void) |
2011 | { | |
2012 | /* vsock_register_mutex not taken since only the transport uses this | |
2013 | * function and only while registered. | |
2014 | */ | |
2015 | return transport; | |
2016 | } | |
2017 | EXPORT_SYMBOL_GPL(vsock_core_get_transport); | |
2018 | ||
05e489b1 SH |
2019 | static void __exit vsock_exit(void) |
2020 | { | |
2021 | /* Do nothing. This function makes this module removable. */ | |
2022 | } | |
2023 | ||
c1eef220 | 2024 | module_init(vsock_init_tables); |
05e489b1 | 2025 | module_exit(vsock_exit); |
c1eef220 | 2026 | |
d021c344 AK |
2027 | MODULE_AUTHOR("VMware, Inc."); |
2028 | MODULE_DESCRIPTION("VMware Virtual Socket Family"); | |
1190cfdb | 2029 | MODULE_VERSION("1.0.2.0-k"); |
d021c344 | 2030 | MODULE_LICENSE("GPL v2"); |