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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 | ||
b9f2b0ff SG |
129 | #define VSOCK_DEFAULT_BUFFER_SIZE (1024 * 256) |
130 | #define VSOCK_DEFAULT_BUFFER_MAX_SIZE (1024 * 256) | |
131 | #define VSOCK_DEFAULT_BUFFER_MIN_SIZE 128 | |
132 | ||
c0cfa2d8 SG |
133 | /* Transport used for host->guest communication */ |
134 | static const struct vsock_transport *transport_h2g; | |
135 | /* Transport used for guest->host communication */ | |
136 | static const struct vsock_transport *transport_g2h; | |
137 | /* Transport used for DGRAM communication */ | |
138 | static const struct vsock_transport *transport_dgram; | |
0e121905 SG |
139 | /* Transport used for local communication */ |
140 | static const struct vsock_transport *transport_local; | |
d021c344 AK |
141 | static DEFINE_MUTEX(vsock_register_mutex); |
142 | ||
d021c344 AK |
143 | /**** UTILS ****/ |
144 | ||
145 | /* Each bound VSocket is stored in the bind hash table and each connected | |
146 | * VSocket is stored in the connected hash table. | |
147 | * | |
148 | * Unbound sockets are all put on the same list attached to the end of the hash | |
149 | * table (vsock_unbound_sockets). Bound sockets are added to the hash table in | |
150 | * the bucket that their local address hashes to (vsock_bound_sockets(addr) | |
151 | * represents the list that addr hashes to). | |
152 | * | |
153 | * Specifically, we initialize the vsock_bind_table array to a size of | |
154 | * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through | |
155 | * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and | |
156 | * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function | |
a49dd9dc | 157 | * mods with VSOCK_HASH_SIZE to ensure this. |
d021c344 | 158 | */ |
d021c344 AK |
159 | #define MAX_PORT_RETRIES 24 |
160 | ||
a49dd9dc | 161 | #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) |
d021c344 AK |
162 | #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) |
163 | #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) | |
164 | ||
165 | /* XXX This can probably be implemented in a better way. */ | |
166 | #define VSOCK_CONN_HASH(src, dst) \ | |
a49dd9dc | 167 | (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) |
d021c344 AK |
168 | #define vsock_connected_sockets(src, dst) \ |
169 | (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) | |
170 | #define vsock_connected_sockets_vsk(vsk) \ | |
171 | vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) | |
172 | ||
44f20980 SH |
173 | struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; |
174 | EXPORT_SYMBOL_GPL(vsock_bind_table); | |
175 | struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; | |
176 | EXPORT_SYMBOL_GPL(vsock_connected_table); | |
177 | DEFINE_SPINLOCK(vsock_table_lock); | |
178 | EXPORT_SYMBOL_GPL(vsock_table_lock); | |
d021c344 | 179 | |
b3a6dfe8 AH |
180 | /* Autobind this socket to the local address if necessary. */ |
181 | static int vsock_auto_bind(struct vsock_sock *vsk) | |
182 | { | |
183 | struct sock *sk = sk_vsock(vsk); | |
184 | struct sockaddr_vm local_addr; | |
185 | ||
186 | if (vsock_addr_bound(&vsk->local_addr)) | |
187 | return 0; | |
188 | vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
189 | return __vsock_bind(sk, &local_addr); | |
190 | } | |
191 | ||
c0cfa2d8 | 192 | static void vsock_init_tables(void) |
d021c344 AK |
193 | { |
194 | int i; | |
195 | ||
196 | for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) | |
197 | INIT_LIST_HEAD(&vsock_bind_table[i]); | |
198 | ||
199 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) | |
200 | INIT_LIST_HEAD(&vsock_connected_table[i]); | |
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 | ||
36c5b48b SG |
233 | list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) { |
234 | if (vsock_addr_equals_addr(addr, &vsk->local_addr)) | |
d021c344 AK |
235 | return sk_vsock(vsk); |
236 | ||
36c5b48b SG |
237 | if (addr->svm_port == vsk->local_addr.svm_port && |
238 | (vsk->local_addr.svm_cid == VMADDR_CID_ANY || | |
239 | addr->svm_cid == VMADDR_CID_ANY)) | |
240 | return sk_vsock(vsk); | |
241 | } | |
242 | ||
d021c344 AK |
243 | return NULL; |
244 | } | |
245 | ||
246 | static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, | |
247 | struct sockaddr_vm *dst) | |
248 | { | |
249 | struct vsock_sock *vsk; | |
250 | ||
251 | list_for_each_entry(vsk, vsock_connected_sockets(src, dst), | |
252 | connected_table) { | |
990454b5 RG |
253 | if (vsock_addr_equals_addr(src, &vsk->remote_addr) && |
254 | dst->svm_port == vsk->local_addr.svm_port) { | |
d021c344 AK |
255 | return sk_vsock(vsk); |
256 | } | |
257 | } | |
258 | ||
259 | return NULL; | |
260 | } | |
261 | ||
d021c344 AK |
262 | static void vsock_insert_unbound(struct vsock_sock *vsk) |
263 | { | |
264 | spin_lock_bh(&vsock_table_lock); | |
265 | __vsock_insert_bound(vsock_unbound_sockets, vsk); | |
266 | spin_unlock_bh(&vsock_table_lock); | |
267 | } | |
268 | ||
269 | void vsock_insert_connected(struct vsock_sock *vsk) | |
270 | { | |
271 | struct list_head *list = vsock_connected_sockets( | |
272 | &vsk->remote_addr, &vsk->local_addr); | |
273 | ||
274 | spin_lock_bh(&vsock_table_lock); | |
275 | __vsock_insert_connected(list, vsk); | |
276 | spin_unlock_bh(&vsock_table_lock); | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(vsock_insert_connected); | |
279 | ||
280 | void vsock_remove_bound(struct vsock_sock *vsk) | |
281 | { | |
282 | spin_lock_bh(&vsock_table_lock); | |
d5afa82c SM |
283 | if (__vsock_in_bound_table(vsk)) |
284 | __vsock_remove_bound(vsk); | |
d021c344 AK |
285 | spin_unlock_bh(&vsock_table_lock); |
286 | } | |
287 | EXPORT_SYMBOL_GPL(vsock_remove_bound); | |
288 | ||
289 | void vsock_remove_connected(struct vsock_sock *vsk) | |
290 | { | |
291 | spin_lock_bh(&vsock_table_lock); | |
d5afa82c SM |
292 | if (__vsock_in_connected_table(vsk)) |
293 | __vsock_remove_connected(vsk); | |
d021c344 AK |
294 | spin_unlock_bh(&vsock_table_lock); |
295 | } | |
296 | EXPORT_SYMBOL_GPL(vsock_remove_connected); | |
297 | ||
298 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) | |
299 | { | |
300 | struct sock *sk; | |
301 | ||
302 | spin_lock_bh(&vsock_table_lock); | |
303 | sk = __vsock_find_bound_socket(addr); | |
304 | if (sk) | |
305 | sock_hold(sk); | |
306 | ||
307 | spin_unlock_bh(&vsock_table_lock); | |
308 | ||
309 | return sk; | |
310 | } | |
311 | EXPORT_SYMBOL_GPL(vsock_find_bound_socket); | |
312 | ||
313 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, | |
314 | struct sockaddr_vm *dst) | |
315 | { | |
316 | struct sock *sk; | |
317 | ||
318 | spin_lock_bh(&vsock_table_lock); | |
319 | sk = __vsock_find_connected_socket(src, dst); | |
320 | if (sk) | |
321 | sock_hold(sk); | |
322 | ||
323 | spin_unlock_bh(&vsock_table_lock); | |
324 | ||
325 | return sk; | |
326 | } | |
327 | EXPORT_SYMBOL_GPL(vsock_find_connected_socket); | |
328 | ||
6773b7dc SH |
329 | void vsock_remove_sock(struct vsock_sock *vsk) |
330 | { | |
d5afa82c SM |
331 | vsock_remove_bound(vsk); |
332 | vsock_remove_connected(vsk); | |
6773b7dc SH |
333 | } |
334 | EXPORT_SYMBOL_GPL(vsock_remove_sock); | |
335 | ||
d021c344 AK |
336 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) |
337 | { | |
338 | int i; | |
339 | ||
340 | spin_lock_bh(&vsock_table_lock); | |
341 | ||
342 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { | |
343 | struct vsock_sock *vsk; | |
344 | list_for_each_entry(vsk, &vsock_connected_table[i], | |
d9af2d67 | 345 | connected_table) |
d021c344 AK |
346 | fn(sk_vsock(vsk)); |
347 | } | |
348 | ||
349 | spin_unlock_bh(&vsock_table_lock); | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); | |
352 | ||
353 | void vsock_add_pending(struct sock *listener, struct sock *pending) | |
354 | { | |
355 | struct vsock_sock *vlistener; | |
356 | struct vsock_sock *vpending; | |
357 | ||
358 | vlistener = vsock_sk(listener); | |
359 | vpending = vsock_sk(pending); | |
360 | ||
361 | sock_hold(pending); | |
362 | sock_hold(listener); | |
363 | list_add_tail(&vpending->pending_links, &vlistener->pending_links); | |
364 | } | |
365 | EXPORT_SYMBOL_GPL(vsock_add_pending); | |
366 | ||
367 | void vsock_remove_pending(struct sock *listener, struct sock *pending) | |
368 | { | |
369 | struct vsock_sock *vpending = vsock_sk(pending); | |
370 | ||
371 | list_del_init(&vpending->pending_links); | |
372 | sock_put(listener); | |
373 | sock_put(pending); | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(vsock_remove_pending); | |
376 | ||
377 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected) | |
378 | { | |
379 | struct vsock_sock *vlistener; | |
380 | struct vsock_sock *vconnected; | |
381 | ||
382 | vlistener = vsock_sk(listener); | |
383 | vconnected = vsock_sk(connected); | |
384 | ||
385 | sock_hold(connected); | |
386 | sock_hold(listener); | |
387 | list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); | |
388 | } | |
389 | EXPORT_SYMBOL_GPL(vsock_enqueue_accept); | |
390 | ||
408624af SG |
391 | static bool vsock_use_local_transport(unsigned int remote_cid) |
392 | { | |
393 | if (!transport_local) | |
394 | return false; | |
395 | ||
396 | if (remote_cid == VMADDR_CID_LOCAL) | |
397 | return true; | |
398 | ||
399 | if (transport_g2h) { | |
400 | return remote_cid == transport_g2h->get_local_cid(); | |
401 | } else { | |
402 | return remote_cid == VMADDR_CID_HOST; | |
403 | } | |
404 | } | |
405 | ||
6a2c0962 SG |
406 | static void vsock_deassign_transport(struct vsock_sock *vsk) |
407 | { | |
408 | if (!vsk->transport) | |
409 | return; | |
410 | ||
411 | vsk->transport->destruct(vsk); | |
412 | module_put(vsk->transport->module); | |
413 | vsk->transport = NULL; | |
414 | } | |
415 | ||
c0cfa2d8 SG |
416 | /* Assign a transport to a socket and call the .init transport callback. |
417 | * | |
418 | * Note: for stream socket this must be called when vsk->remote_addr is set | |
419 | * (e.g. during the connect() or when a connection request on a listener | |
420 | * socket is received). | |
421 | * The vsk->remote_addr is used to decide which transport to use: | |
408624af SG |
422 | * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if |
423 | * g2h is not loaded, will use local transport; | |
c0cfa2d8 | 424 | * - remote CID <= VMADDR_CID_HOST will use guest->host transport; |
c0cfa2d8 SG |
425 | * - remote CID > VMADDR_CID_HOST will use host->guest transport; |
426 | */ | |
427 | int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) | |
428 | { | |
429 | const struct vsock_transport *new_transport; | |
430 | struct sock *sk = sk_vsock(vsk); | |
431 | unsigned int remote_cid = vsk->remote_addr.svm_cid; | |
039fccca | 432 | int ret; |
c0cfa2d8 SG |
433 | |
434 | switch (sk->sk_type) { | |
435 | case SOCK_DGRAM: | |
436 | new_transport = transport_dgram; | |
437 | break; | |
438 | case SOCK_STREAM: | |
408624af SG |
439 | if (vsock_use_local_transport(remote_cid)) |
440 | new_transport = transport_local; | |
441 | else if (remote_cid <= VMADDR_CID_HOST) | |
c0cfa2d8 SG |
442 | new_transport = transport_g2h; |
443 | else | |
444 | new_transport = transport_h2g; | |
445 | break; | |
446 | default: | |
447 | return -ESOCKTNOSUPPORT; | |
448 | } | |
449 | ||
450 | if (vsk->transport) { | |
451 | if (vsk->transport == new_transport) | |
452 | return 0; | |
453 | ||
3f74957f SG |
454 | /* transport->release() must be called with sock lock acquired. |
455 | * This path can only be taken during vsock_stream_connect(), | |
456 | * where we have already held the sock lock. | |
457 | * In the other cases, this function is called on a new socket | |
458 | * which is not assigned to any transport. | |
459 | */ | |
c0cfa2d8 | 460 | vsk->transport->release(vsk); |
6a2c0962 | 461 | vsock_deassign_transport(vsk); |
c0cfa2d8 SG |
462 | } |
463 | ||
6a2c0962 SG |
464 | /* We increase the module refcnt to prevent the transport unloading |
465 | * while there are open sockets assigned to it. | |
466 | */ | |
467 | if (!new_transport || !try_module_get(new_transport->module)) | |
c0cfa2d8 SG |
468 | return -ENODEV; |
469 | ||
039fccca SG |
470 | ret = new_transport->init(vsk, psk); |
471 | if (ret) { | |
472 | module_put(new_transport->module); | |
473 | return ret; | |
474 | } | |
475 | ||
c0cfa2d8 SG |
476 | vsk->transport = new_transport; |
477 | ||
039fccca | 478 | return 0; |
c0cfa2d8 SG |
479 | } |
480 | EXPORT_SYMBOL_GPL(vsock_assign_transport); | |
481 | ||
482 | bool vsock_find_cid(unsigned int cid) | |
483 | { | |
484 | if (transport_g2h && cid == transport_g2h->get_local_cid()) | |
485 | return true; | |
486 | ||
487 | if (transport_h2g && cid == VMADDR_CID_HOST) | |
488 | return true; | |
489 | ||
408624af SG |
490 | if (transport_local && cid == VMADDR_CID_LOCAL) |
491 | return true; | |
492 | ||
c0cfa2d8 SG |
493 | return false; |
494 | } | |
495 | EXPORT_SYMBOL_GPL(vsock_find_cid); | |
496 | ||
d021c344 AK |
497 | static struct sock *vsock_dequeue_accept(struct sock *listener) |
498 | { | |
499 | struct vsock_sock *vlistener; | |
500 | struct vsock_sock *vconnected; | |
501 | ||
502 | vlistener = vsock_sk(listener); | |
503 | ||
504 | if (list_empty(&vlistener->accept_queue)) | |
505 | return NULL; | |
506 | ||
507 | vconnected = list_entry(vlistener->accept_queue.next, | |
508 | struct vsock_sock, accept_queue); | |
509 | ||
510 | list_del_init(&vconnected->accept_queue); | |
511 | sock_put(listener); | |
512 | /* The caller will need a reference on the connected socket so we let | |
513 | * it call sock_put(). | |
514 | */ | |
515 | ||
516 | return sk_vsock(vconnected); | |
517 | } | |
518 | ||
519 | static bool vsock_is_accept_queue_empty(struct sock *sk) | |
520 | { | |
521 | struct vsock_sock *vsk = vsock_sk(sk); | |
522 | return list_empty(&vsk->accept_queue); | |
523 | } | |
524 | ||
525 | static bool vsock_is_pending(struct sock *sk) | |
526 | { | |
527 | struct vsock_sock *vsk = vsock_sk(sk); | |
528 | return !list_empty(&vsk->pending_links); | |
529 | } | |
530 | ||
531 | static int vsock_send_shutdown(struct sock *sk, int mode) | |
532 | { | |
fe502c4a SG |
533 | struct vsock_sock *vsk = vsock_sk(sk); |
534 | ||
c0cfa2d8 SG |
535 | if (!vsk->transport) |
536 | return -ENODEV; | |
537 | ||
fe502c4a | 538 | return vsk->transport->shutdown(vsk, mode); |
d021c344 AK |
539 | } |
540 | ||
455f05ec | 541 | static void vsock_pending_work(struct work_struct *work) |
d021c344 AK |
542 | { |
543 | struct sock *sk; | |
544 | struct sock *listener; | |
545 | struct vsock_sock *vsk; | |
546 | bool cleanup; | |
547 | ||
455f05ec | 548 | vsk = container_of(work, struct vsock_sock, pending_work.work); |
d021c344 AK |
549 | sk = sk_vsock(vsk); |
550 | listener = vsk->listener; | |
551 | cleanup = true; | |
552 | ||
553 | lock_sock(listener); | |
4192f672 | 554 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
d021c344 AK |
555 | |
556 | if (vsock_is_pending(sk)) { | |
557 | vsock_remove_pending(listener, sk); | |
1190cfdb | 558 | |
7976a11b | 559 | sk_acceptq_removed(listener); |
d021c344 AK |
560 | } else if (!vsk->rejected) { |
561 | /* We are not on the pending list and accept() did not reject | |
562 | * us, so we must have been accepted by our user process. We | |
563 | * just need to drop our references to the sockets and be on | |
564 | * our way. | |
565 | */ | |
566 | cleanup = false; | |
567 | goto out; | |
568 | } | |
569 | ||
d021c344 AK |
570 | /* We need to remove ourself from the global connected sockets list so |
571 | * incoming packets can't find this socket, and to reduce the reference | |
572 | * count. | |
573 | */ | |
d5afa82c | 574 | vsock_remove_connected(vsk); |
d021c344 | 575 | |
3b4477d2 | 576 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
577 | |
578 | out: | |
579 | release_sock(sk); | |
580 | release_sock(listener); | |
581 | if (cleanup) | |
582 | sock_put(sk); | |
583 | ||
584 | sock_put(sk); | |
585 | sock_put(listener); | |
586 | } | |
d021c344 AK |
587 | |
588 | /**** SOCKET OPERATIONS ****/ | |
589 | ||
590 | static int __vsock_bind_stream(struct vsock_sock *vsk, | |
591 | struct sockaddr_vm *addr) | |
592 | { | |
a22d3251 | 593 | static u32 port; |
d021c344 AK |
594 | struct sockaddr_vm new_addr; |
595 | ||
8236b08c LW |
596 | if (!port) |
597 | port = LAST_RESERVED_PORT + 1 + | |
598 | prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); | |
599 | ||
d021c344 AK |
600 | vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); |
601 | ||
602 | if (addr->svm_port == VMADDR_PORT_ANY) { | |
603 | bool found = false; | |
604 | unsigned int i; | |
605 | ||
606 | for (i = 0; i < MAX_PORT_RETRIES; i++) { | |
607 | if (port <= LAST_RESERVED_PORT) | |
608 | port = LAST_RESERVED_PORT + 1; | |
609 | ||
610 | new_addr.svm_port = port++; | |
611 | ||
612 | if (!__vsock_find_bound_socket(&new_addr)) { | |
613 | found = true; | |
614 | break; | |
615 | } | |
616 | } | |
617 | ||
618 | if (!found) | |
619 | return -EADDRNOTAVAIL; | |
620 | } else { | |
621 | /* If port is in reserved range, ensure caller | |
622 | * has necessary privileges. | |
623 | */ | |
624 | if (addr->svm_port <= LAST_RESERVED_PORT && | |
625 | !capable(CAP_NET_BIND_SERVICE)) { | |
626 | return -EACCES; | |
627 | } | |
628 | ||
629 | if (__vsock_find_bound_socket(&new_addr)) | |
630 | return -EADDRINUSE; | |
631 | } | |
632 | ||
633 | vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); | |
634 | ||
635 | /* Remove stream sockets from the unbound list and add them to the hash | |
636 | * table for easy lookup by its address. The unbound list is simply an | |
637 | * extra entry at the end of the hash table, a trick used by AF_UNIX. | |
638 | */ | |
639 | __vsock_remove_bound(vsk); | |
640 | __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | static int __vsock_bind_dgram(struct vsock_sock *vsk, | |
646 | struct sockaddr_vm *addr) | |
647 | { | |
fe502c4a | 648 | return vsk->transport->dgram_bind(vsk, addr); |
d021c344 AK |
649 | } |
650 | ||
651 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) | |
652 | { | |
653 | struct vsock_sock *vsk = vsock_sk(sk); | |
d021c344 AK |
654 | int retval; |
655 | ||
656 | /* First ensure this socket isn't already bound. */ | |
657 | if (vsock_addr_bound(&vsk->local_addr)) | |
658 | return -EINVAL; | |
659 | ||
660 | /* Now bind to the provided address or select appropriate values if | |
661 | * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that | |
662 | * like AF_INET prevents binding to a non-local IP address (in most | |
c0cfa2d8 | 663 | * cases), we only allow binding to a local CID. |
d021c344 | 664 | */ |
c0cfa2d8 | 665 | if (addr->svm_cid != VMADDR_CID_ANY && !vsock_find_cid(addr->svm_cid)) |
d021c344 AK |
666 | return -EADDRNOTAVAIL; |
667 | ||
668 | switch (sk->sk_socket->type) { | |
669 | case SOCK_STREAM: | |
670 | spin_lock_bh(&vsock_table_lock); | |
671 | retval = __vsock_bind_stream(vsk, addr); | |
672 | spin_unlock_bh(&vsock_table_lock); | |
673 | break; | |
674 | ||
675 | case SOCK_DGRAM: | |
676 | retval = __vsock_bind_dgram(vsk, addr); | |
677 | break; | |
678 | ||
679 | default: | |
680 | retval = -EINVAL; | |
681 | break; | |
682 | } | |
683 | ||
684 | return retval; | |
685 | } | |
686 | ||
455f05ec CW |
687 | static void vsock_connect_timeout(struct work_struct *work); |
688 | ||
b9ca2f5f SG |
689 | static struct sock *__vsock_create(struct net *net, |
690 | struct socket *sock, | |
691 | struct sock *parent, | |
692 | gfp_t priority, | |
693 | unsigned short type, | |
694 | int kern) | |
d021c344 AK |
695 | { |
696 | struct sock *sk; | |
697 | struct vsock_sock *psk; | |
698 | struct vsock_sock *vsk; | |
699 | ||
11aa9c28 | 700 | sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); |
d021c344 AK |
701 | if (!sk) |
702 | return NULL; | |
703 | ||
704 | sock_init_data(sock, sk); | |
705 | ||
706 | /* sk->sk_type is normally set in sock_init_data, but only if sock is | |
707 | * non-NULL. We make sure that our sockets always have a type by | |
708 | * setting it here if needed. | |
709 | */ | |
710 | if (!sock) | |
711 | sk->sk_type = type; | |
712 | ||
713 | vsk = vsock_sk(sk); | |
714 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
715 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
716 | ||
717 | sk->sk_destruct = vsock_sk_destruct; | |
718 | sk->sk_backlog_rcv = vsock_queue_rcv_skb; | |
d021c344 AK |
719 | sock_reset_flag(sk, SOCK_DONE); |
720 | ||
721 | INIT_LIST_HEAD(&vsk->bound_table); | |
722 | INIT_LIST_HEAD(&vsk->connected_table); | |
723 | vsk->listener = NULL; | |
724 | INIT_LIST_HEAD(&vsk->pending_links); | |
725 | INIT_LIST_HEAD(&vsk->accept_queue); | |
726 | vsk->rejected = false; | |
727 | vsk->sent_request = false; | |
728 | vsk->ignore_connecting_rst = false; | |
729 | vsk->peer_shutdown = 0; | |
455f05ec CW |
730 | INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); |
731 | INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); | |
d021c344 AK |
732 | |
733 | psk = parent ? vsock_sk(parent) : NULL; | |
734 | if (parent) { | |
735 | vsk->trusted = psk->trusted; | |
736 | vsk->owner = get_cred(psk->owner); | |
737 | vsk->connect_timeout = psk->connect_timeout; | |
b9f2b0ff SG |
738 | vsk->buffer_size = psk->buffer_size; |
739 | vsk->buffer_min_size = psk->buffer_min_size; | |
740 | vsk->buffer_max_size = psk->buffer_max_size; | |
d021c344 AK |
741 | } else { |
742 | vsk->trusted = capable(CAP_NET_ADMIN); | |
743 | vsk->owner = get_current_cred(); | |
744 | vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
b9f2b0ff SG |
745 | vsk->buffer_size = VSOCK_DEFAULT_BUFFER_SIZE; |
746 | vsk->buffer_min_size = VSOCK_DEFAULT_BUFFER_MIN_SIZE; | |
747 | vsk->buffer_max_size = VSOCK_DEFAULT_BUFFER_MAX_SIZE; | |
d021c344 AK |
748 | } |
749 | ||
d021c344 AK |
750 | return sk; |
751 | } | |
d021c344 | 752 | |
0d9138ff | 753 | static void __vsock_release(struct sock *sk, int level) |
d021c344 AK |
754 | { |
755 | if (sk) { | |
d021c344 AK |
756 | struct sock *pending; |
757 | struct vsock_sock *vsk; | |
758 | ||
759 | vsk = vsock_sk(sk); | |
760 | pending = NULL; /* Compiler warning. */ | |
761 | ||
0d9138ff DC |
762 | /* When "level" is SINGLE_DEPTH_NESTING, use the nested |
763 | * version to avoid the warning "possible recursive locking | |
764 | * detected". When "level" is 0, lock_sock_nested(sk, level) | |
765 | * is the same as lock_sock(sk). | |
766 | */ | |
767 | lock_sock_nested(sk, level); | |
3f74957f SG |
768 | |
769 | if (vsk->transport) | |
770 | vsk->transport->release(vsk); | |
771 | else if (sk->sk_type == SOCK_STREAM) | |
772 | vsock_remove_sock(vsk); | |
773 | ||
d021c344 AK |
774 | sock_orphan(sk); |
775 | sk->sk_shutdown = SHUTDOWN_MASK; | |
776 | ||
3b7ad08b | 777 | skb_queue_purge(&sk->sk_receive_queue); |
d021c344 AK |
778 | |
779 | /* Clean up any sockets that never were accepted. */ | |
780 | while ((pending = vsock_dequeue_accept(sk)) != NULL) { | |
0d9138ff | 781 | __vsock_release(pending, SINGLE_DEPTH_NESTING); |
d021c344 AK |
782 | sock_put(pending); |
783 | } | |
784 | ||
785 | release_sock(sk); | |
786 | sock_put(sk); | |
787 | } | |
788 | } | |
789 | ||
790 | static void vsock_sk_destruct(struct sock *sk) | |
791 | { | |
792 | struct vsock_sock *vsk = vsock_sk(sk); | |
793 | ||
6a2c0962 | 794 | vsock_deassign_transport(vsk); |
d021c344 AK |
795 | |
796 | /* When clearing these addresses, there's no need to set the family and | |
797 | * possibly register the address family with the kernel. | |
798 | */ | |
799 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
800 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); | |
801 | ||
802 | put_cred(vsk->owner); | |
803 | } | |
804 | ||
805 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
806 | { | |
807 | int err; | |
808 | ||
809 | err = sock_queue_rcv_skb(sk, skb); | |
810 | if (err) | |
811 | kfree_skb(skb); | |
812 | ||
813 | return err; | |
814 | } | |
815 | ||
b9ca2f5f SG |
816 | struct sock *vsock_create_connected(struct sock *parent) |
817 | { | |
818 | return __vsock_create(sock_net(parent), NULL, parent, GFP_KERNEL, | |
819 | parent->sk_type, 0); | |
820 | } | |
821 | EXPORT_SYMBOL_GPL(vsock_create_connected); | |
822 | ||
d021c344 AK |
823 | s64 vsock_stream_has_data(struct vsock_sock *vsk) |
824 | { | |
fe502c4a | 825 | return vsk->transport->stream_has_data(vsk); |
d021c344 AK |
826 | } |
827 | EXPORT_SYMBOL_GPL(vsock_stream_has_data); | |
828 | ||
829 | s64 vsock_stream_has_space(struct vsock_sock *vsk) | |
830 | { | |
fe502c4a | 831 | return vsk->transport->stream_has_space(vsk); |
d021c344 AK |
832 | } |
833 | EXPORT_SYMBOL_GPL(vsock_stream_has_space); | |
834 | ||
835 | static int vsock_release(struct socket *sock) | |
836 | { | |
0d9138ff | 837 | __vsock_release(sock->sk, 0); |
d021c344 AK |
838 | sock->sk = NULL; |
839 | sock->state = SS_FREE; | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | static int | |
845 | vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
846 | { | |
847 | int err; | |
848 | struct sock *sk; | |
849 | struct sockaddr_vm *vm_addr; | |
850 | ||
851 | sk = sock->sk; | |
852 | ||
853 | if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) | |
854 | return -EINVAL; | |
855 | ||
856 | lock_sock(sk); | |
857 | err = __vsock_bind(sk, vm_addr); | |
858 | release_sock(sk); | |
859 | ||
860 | return err; | |
861 | } | |
862 | ||
863 | static int vsock_getname(struct socket *sock, | |
9b2c45d4 | 864 | struct sockaddr *addr, int peer) |
d021c344 AK |
865 | { |
866 | int err; | |
867 | struct sock *sk; | |
868 | struct vsock_sock *vsk; | |
869 | struct sockaddr_vm *vm_addr; | |
870 | ||
871 | sk = sock->sk; | |
872 | vsk = vsock_sk(sk); | |
873 | err = 0; | |
874 | ||
875 | lock_sock(sk); | |
876 | ||
877 | if (peer) { | |
878 | if (sock->state != SS_CONNECTED) { | |
879 | err = -ENOTCONN; | |
880 | goto out; | |
881 | } | |
882 | vm_addr = &vsk->remote_addr; | |
883 | } else { | |
884 | vm_addr = &vsk->local_addr; | |
885 | } | |
886 | ||
887 | if (!vm_addr) { | |
888 | err = -EINVAL; | |
889 | goto out; | |
890 | } | |
891 | ||
892 | /* sys_getsockname() and sys_getpeername() pass us a | |
893 | * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately | |
894 | * that macro is defined in socket.c instead of .h, so we hardcode its | |
895 | * value here. | |
896 | */ | |
897 | BUILD_BUG_ON(sizeof(*vm_addr) > 128); | |
898 | memcpy(addr, vm_addr, sizeof(*vm_addr)); | |
9b2c45d4 | 899 | err = sizeof(*vm_addr); |
d021c344 AK |
900 | |
901 | out: | |
902 | release_sock(sk); | |
903 | return err; | |
904 | } | |
905 | ||
906 | static int vsock_shutdown(struct socket *sock, int mode) | |
907 | { | |
908 | int err; | |
909 | struct sock *sk; | |
910 | ||
911 | /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses | |
912 | * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode | |
913 | * here like the other address families do. Note also that the | |
914 | * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), | |
915 | * which is what we want. | |
916 | */ | |
917 | mode++; | |
918 | ||
919 | if ((mode & ~SHUTDOWN_MASK) || !mode) | |
920 | return -EINVAL; | |
921 | ||
922 | /* If this is a STREAM socket and it is not connected then bail out | |
923 | * immediately. If it is a DGRAM socket then we must first kick the | |
924 | * socket so that it wakes up from any sleeping calls, for example | |
925 | * recv(), and then afterwards return the error. | |
926 | */ | |
927 | ||
928 | sk = sock->sk; | |
929 | if (sock->state == SS_UNCONNECTED) { | |
930 | err = -ENOTCONN; | |
931 | if (sk->sk_type == SOCK_STREAM) | |
932 | return err; | |
933 | } else { | |
934 | sock->state = SS_DISCONNECTING; | |
935 | err = 0; | |
936 | } | |
937 | ||
938 | /* Receive and send shutdowns are treated alike. */ | |
939 | mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); | |
940 | if (mode) { | |
941 | lock_sock(sk); | |
942 | sk->sk_shutdown |= mode; | |
943 | sk->sk_state_change(sk); | |
944 | release_sock(sk); | |
945 | ||
946 | if (sk->sk_type == SOCK_STREAM) { | |
947 | sock_reset_flag(sk, SOCK_DONE); | |
948 | vsock_send_shutdown(sk, mode); | |
949 | } | |
950 | } | |
951 | ||
952 | return err; | |
953 | } | |
954 | ||
a11e1d43 LT |
955 | static __poll_t vsock_poll(struct file *file, struct socket *sock, |
956 | poll_table *wait) | |
d021c344 | 957 | { |
a11e1d43 LT |
958 | struct sock *sk; |
959 | __poll_t mask; | |
960 | struct vsock_sock *vsk; | |
961 | ||
962 | sk = sock->sk; | |
963 | vsk = vsock_sk(sk); | |
964 | ||
965 | poll_wait(file, sk_sleep(sk), wait); | |
966 | mask = 0; | |
d021c344 AK |
967 | |
968 | if (sk->sk_err) | |
969 | /* Signify that there has been an error on this socket. */ | |
a9a08845 | 970 | mask |= EPOLLERR; |
d021c344 AK |
971 | |
972 | /* INET sockets treat local write shutdown and peer write shutdown as a | |
a9a08845 | 973 | * case of EPOLLHUP set. |
d021c344 AK |
974 | */ |
975 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || | |
976 | ((sk->sk_shutdown & SEND_SHUTDOWN) && | |
977 | (vsk->peer_shutdown & SEND_SHUTDOWN))) { | |
a9a08845 | 978 | mask |= EPOLLHUP; |
d021c344 AK |
979 | } |
980 | ||
981 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
982 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 983 | mask |= EPOLLRDHUP; |
d021c344 AK |
984 | } |
985 | ||
986 | if (sock->type == SOCK_DGRAM) { | |
987 | /* For datagram sockets we can read if there is something in | |
988 | * the queue and write as long as the socket isn't shutdown for | |
989 | * sending. | |
990 | */ | |
3ef7cf57 | 991 | if (!skb_queue_empty_lockless(&sk->sk_receive_queue) || |
d021c344 | 992 | (sk->sk_shutdown & RCV_SHUTDOWN)) { |
a9a08845 | 993 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
994 | } |
995 | ||
996 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) | |
a9a08845 | 997 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
d021c344 AK |
998 | |
999 | } else if (sock->type == SOCK_STREAM) { | |
fe502c4a | 1000 | const struct vsock_transport *transport = vsk->transport; |
d021c344 AK |
1001 | lock_sock(sk); |
1002 | ||
1003 | /* Listening sockets that have connections in their accept | |
1004 | * queue can be read. | |
1005 | */ | |
3b4477d2 | 1006 | if (sk->sk_state == TCP_LISTEN |
d021c344 | 1007 | && !vsock_is_accept_queue_empty(sk)) |
a9a08845 | 1008 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
1009 | |
1010 | /* If there is something in the queue then we can read. */ | |
c0cfa2d8 | 1011 | if (transport && transport->stream_is_active(vsk) && |
d021c344 AK |
1012 | !(sk->sk_shutdown & RCV_SHUTDOWN)) { |
1013 | bool data_ready_now = false; | |
1014 | int ret = transport->notify_poll_in( | |
1015 | vsk, 1, &data_ready_now); | |
1016 | if (ret < 0) { | |
a9a08845 | 1017 | mask |= EPOLLERR; |
d021c344 AK |
1018 | } else { |
1019 | if (data_ready_now) | |
a9a08845 | 1020 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
1021 | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | /* Sockets whose connections have been closed, reset, or | |
1026 | * terminated should also be considered read, and we check the | |
1027 | * shutdown flag for that. | |
1028 | */ | |
1029 | if (sk->sk_shutdown & RCV_SHUTDOWN || | |
1030 | vsk->peer_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 1031 | mask |= EPOLLIN | EPOLLRDNORM; |
d021c344 AK |
1032 | } |
1033 | ||
1034 | /* Connected sockets that can produce data can be written. */ | |
1980c058 | 1035 | if (transport && sk->sk_state == TCP_ESTABLISHED) { |
d021c344 AK |
1036 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
1037 | bool space_avail_now = false; | |
1038 | int ret = transport->notify_poll_out( | |
1039 | vsk, 1, &space_avail_now); | |
1040 | if (ret < 0) { | |
a9a08845 | 1041 | mask |= EPOLLERR; |
d021c344 AK |
1042 | } else { |
1043 | if (space_avail_now) | |
a9a08845 | 1044 | /* Remove EPOLLWRBAND since INET |
d021c344 AK |
1045 | * sockets are not setting it. |
1046 | */ | |
a9a08845 | 1047 | mask |= EPOLLOUT | EPOLLWRNORM; |
d021c344 AK |
1048 | |
1049 | } | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | /* Simulate INET socket poll behaviors, which sets | |
a9a08845 | 1054 | * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, |
d021c344 AK |
1055 | * but local send is not shutdown. |
1056 | */ | |
ba3169fc | 1057 | if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { |
d021c344 | 1058 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) |
a9a08845 | 1059 | mask |= EPOLLOUT | EPOLLWRNORM; |
d021c344 AK |
1060 | |
1061 | } | |
1062 | ||
1063 | release_sock(sk); | |
1064 | } | |
1065 | ||
1066 | return mask; | |
1067 | } | |
1068 | ||
1b784140 YX |
1069 | static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, |
1070 | size_t len) | |
d021c344 AK |
1071 | { |
1072 | int err; | |
1073 | struct sock *sk; | |
1074 | struct vsock_sock *vsk; | |
1075 | struct sockaddr_vm *remote_addr; | |
fe502c4a | 1076 | const struct vsock_transport *transport; |
d021c344 AK |
1077 | |
1078 | if (msg->msg_flags & MSG_OOB) | |
1079 | return -EOPNOTSUPP; | |
1080 | ||
1081 | /* For now, MSG_DONTWAIT is always assumed... */ | |
1082 | err = 0; | |
1083 | sk = sock->sk; | |
1084 | vsk = vsock_sk(sk); | |
fe502c4a | 1085 | transport = vsk->transport; |
d021c344 AK |
1086 | |
1087 | lock_sock(sk); | |
1088 | ||
b3a6dfe8 AH |
1089 | err = vsock_auto_bind(vsk); |
1090 | if (err) | |
1091 | goto out; | |
d021c344 | 1092 | |
d021c344 AK |
1093 | |
1094 | /* If the provided message contains an address, use that. Otherwise | |
1095 | * fall back on the socket's remote handle (if it has been connected). | |
1096 | */ | |
1097 | if (msg->msg_name && | |
1098 | vsock_addr_cast(msg->msg_name, msg->msg_namelen, | |
1099 | &remote_addr) == 0) { | |
1100 | /* Ensure this address is of the right type and is a valid | |
1101 | * destination. | |
1102 | */ | |
1103 | ||
1104 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
1105 | remote_addr->svm_cid = transport->get_local_cid(); | |
1106 | ||
1107 | if (!vsock_addr_bound(remote_addr)) { | |
1108 | err = -EINVAL; | |
1109 | goto out; | |
1110 | } | |
1111 | } else if (sock->state == SS_CONNECTED) { | |
1112 | remote_addr = &vsk->remote_addr; | |
1113 | ||
1114 | if (remote_addr->svm_cid == VMADDR_CID_ANY) | |
1115 | remote_addr->svm_cid = transport->get_local_cid(); | |
1116 | ||
1117 | /* XXX Should connect() or this function ensure remote_addr is | |
1118 | * bound? | |
1119 | */ | |
1120 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1121 | err = -EINVAL; | |
1122 | goto out; | |
1123 | } | |
1124 | } else { | |
1125 | err = -EINVAL; | |
1126 | goto out; | |
1127 | } | |
1128 | ||
1129 | if (!transport->dgram_allow(remote_addr->svm_cid, | |
1130 | remote_addr->svm_port)) { | |
1131 | err = -EINVAL; | |
1132 | goto out; | |
1133 | } | |
1134 | ||
0f7db23a | 1135 | err = transport->dgram_enqueue(vsk, remote_addr, msg, len); |
d021c344 AK |
1136 | |
1137 | out: | |
1138 | release_sock(sk); | |
1139 | return err; | |
1140 | } | |
1141 | ||
1142 | static int vsock_dgram_connect(struct socket *sock, | |
1143 | struct sockaddr *addr, int addr_len, int flags) | |
1144 | { | |
1145 | int err; | |
1146 | struct sock *sk; | |
1147 | struct vsock_sock *vsk; | |
1148 | struct sockaddr_vm *remote_addr; | |
1149 | ||
1150 | sk = sock->sk; | |
1151 | vsk = vsock_sk(sk); | |
1152 | ||
1153 | err = vsock_addr_cast(addr, addr_len, &remote_addr); | |
1154 | if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { | |
1155 | lock_sock(sk); | |
1156 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, | |
1157 | VMADDR_PORT_ANY); | |
1158 | sock->state = SS_UNCONNECTED; | |
1159 | release_sock(sk); | |
1160 | return 0; | |
1161 | } else if (err != 0) | |
1162 | return -EINVAL; | |
1163 | ||
1164 | lock_sock(sk); | |
1165 | ||
b3a6dfe8 AH |
1166 | err = vsock_auto_bind(vsk); |
1167 | if (err) | |
1168 | goto out; | |
d021c344 | 1169 | |
fe502c4a SG |
1170 | if (!vsk->transport->dgram_allow(remote_addr->svm_cid, |
1171 | remote_addr->svm_port)) { | |
d021c344 AK |
1172 | err = -EINVAL; |
1173 | goto out; | |
1174 | } | |
1175 | ||
1176 | memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); | |
1177 | sock->state = SS_CONNECTED; | |
1178 | ||
1179 | out: | |
1180 | release_sock(sk); | |
1181 | return err; | |
1182 | } | |
1183 | ||
1b784140 YX |
1184 | static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, |
1185 | size_t len, int flags) | |
d021c344 | 1186 | { |
fe502c4a SG |
1187 | struct vsock_sock *vsk = vsock_sk(sock->sk); |
1188 | ||
1189 | return vsk->transport->dgram_dequeue(vsk, msg, len, flags); | |
d021c344 AK |
1190 | } |
1191 | ||
1192 | static const struct proto_ops vsock_dgram_ops = { | |
1193 | .family = PF_VSOCK, | |
1194 | .owner = THIS_MODULE, | |
1195 | .release = vsock_release, | |
1196 | .bind = vsock_bind, | |
1197 | .connect = vsock_dgram_connect, | |
1198 | .socketpair = sock_no_socketpair, | |
1199 | .accept = sock_no_accept, | |
1200 | .getname = vsock_getname, | |
a11e1d43 | 1201 | .poll = vsock_poll, |
d021c344 AK |
1202 | .ioctl = sock_no_ioctl, |
1203 | .listen = sock_no_listen, | |
1204 | .shutdown = vsock_shutdown, | |
d021c344 AK |
1205 | .sendmsg = vsock_dgram_sendmsg, |
1206 | .recvmsg = vsock_dgram_recvmsg, | |
1207 | .mmap = sock_no_mmap, | |
1208 | .sendpage = sock_no_sendpage, | |
1209 | }; | |
1210 | ||
380feae0 PT |
1211 | static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) |
1212 | { | |
fe502c4a SG |
1213 | const struct vsock_transport *transport = vsk->transport; |
1214 | ||
380feae0 PT |
1215 | if (!transport->cancel_pkt) |
1216 | return -EOPNOTSUPP; | |
1217 | ||
1218 | return transport->cancel_pkt(vsk); | |
1219 | } | |
1220 | ||
d021c344 AK |
1221 | static void vsock_connect_timeout(struct work_struct *work) |
1222 | { | |
1223 | struct sock *sk; | |
1224 | struct vsock_sock *vsk; | |
380feae0 | 1225 | int cancel = 0; |
d021c344 | 1226 | |
455f05ec | 1227 | vsk = container_of(work, struct vsock_sock, connect_work.work); |
d021c344 AK |
1228 | sk = sk_vsock(vsk); |
1229 | ||
1230 | lock_sock(sk); | |
3b4477d2 | 1231 | if (sk->sk_state == TCP_SYN_SENT && |
d021c344 | 1232 | (sk->sk_shutdown != SHUTDOWN_MASK)) { |
3b4477d2 | 1233 | sk->sk_state = TCP_CLOSE; |
d021c344 AK |
1234 | sk->sk_err = ETIMEDOUT; |
1235 | sk->sk_error_report(sk); | |
380feae0 | 1236 | cancel = 1; |
d021c344 AK |
1237 | } |
1238 | release_sock(sk); | |
380feae0 PT |
1239 | if (cancel) |
1240 | vsock_transport_cancel_pkt(vsk); | |
d021c344 AK |
1241 | |
1242 | sock_put(sk); | |
1243 | } | |
1244 | ||
1245 | static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, | |
1246 | int addr_len, int flags) | |
1247 | { | |
1248 | int err; | |
1249 | struct sock *sk; | |
1250 | struct vsock_sock *vsk; | |
fe502c4a | 1251 | const struct vsock_transport *transport; |
d021c344 AK |
1252 | struct sockaddr_vm *remote_addr; |
1253 | long timeout; | |
1254 | DEFINE_WAIT(wait); | |
1255 | ||
1256 | err = 0; | |
1257 | sk = sock->sk; | |
1258 | vsk = vsock_sk(sk); | |
1259 | ||
1260 | lock_sock(sk); | |
1261 | ||
1262 | /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ | |
1263 | switch (sock->state) { | |
1264 | case SS_CONNECTED: | |
1265 | err = -EISCONN; | |
1266 | goto out; | |
1267 | case SS_DISCONNECTING: | |
1268 | err = -EINVAL; | |
1269 | goto out; | |
1270 | case SS_CONNECTING: | |
1271 | /* This continues on so we can move sock into the SS_CONNECTED | |
1272 | * state once the connection has completed (at which point err | |
1273 | * will be set to zero also). Otherwise, we will either wait | |
1274 | * for the connection or return -EALREADY should this be a | |
1275 | * non-blocking call. | |
1276 | */ | |
1277 | err = -EALREADY; | |
1278 | break; | |
1279 | default: | |
3b4477d2 | 1280 | if ((sk->sk_state == TCP_LISTEN) || |
d021c344 AK |
1281 | vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { |
1282 | err = -EINVAL; | |
1283 | goto out; | |
1284 | } | |
1285 | ||
c0cfa2d8 SG |
1286 | /* Set the remote address that we are connecting to. */ |
1287 | memcpy(&vsk->remote_addr, remote_addr, | |
1288 | sizeof(vsk->remote_addr)); | |
1289 | ||
1290 | err = vsock_assign_transport(vsk, NULL); | |
1291 | if (err) | |
1292 | goto out; | |
1293 | ||
1294 | transport = vsk->transport; | |
1295 | ||
d021c344 AK |
1296 | /* The hypervisor and well-known contexts do not have socket |
1297 | * endpoints. | |
1298 | */ | |
c0cfa2d8 SG |
1299 | if (!transport || |
1300 | !transport->stream_allow(remote_addr->svm_cid, | |
d021c344 AK |
1301 | remote_addr->svm_port)) { |
1302 | err = -ENETUNREACH; | |
1303 | goto out; | |
1304 | } | |
1305 | ||
b3a6dfe8 AH |
1306 | err = vsock_auto_bind(vsk); |
1307 | if (err) | |
1308 | goto out; | |
d021c344 | 1309 | |
3b4477d2 | 1310 | sk->sk_state = TCP_SYN_SENT; |
d021c344 AK |
1311 | |
1312 | err = transport->connect(vsk); | |
1313 | if (err < 0) | |
1314 | goto out; | |
1315 | ||
1316 | /* Mark sock as connecting and set the error code to in | |
1317 | * progress in case this is a non-blocking connect. | |
1318 | */ | |
1319 | sock->state = SS_CONNECTING; | |
1320 | err = -EINPROGRESS; | |
1321 | } | |
1322 | ||
1323 | /* The receive path will handle all communication until we are able to | |
1324 | * enter the connected state. Here we wait for the connection to be | |
1325 | * completed or a notification of an error. | |
1326 | */ | |
1327 | timeout = vsk->connect_timeout; | |
1328 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1329 | ||
3b4477d2 | 1330 | while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { |
d021c344 AK |
1331 | if (flags & O_NONBLOCK) { |
1332 | /* If we're not going to block, we schedule a timeout | |
1333 | * function to generate a timeout on the connection | |
1334 | * attempt, in case the peer doesn't respond in a | |
1335 | * timely manner. We hold on to the socket until the | |
1336 | * timeout fires. | |
1337 | */ | |
1338 | sock_hold(sk); | |
455f05ec | 1339 | schedule_delayed_work(&vsk->connect_work, timeout); |
d021c344 AK |
1340 | |
1341 | /* Skip ahead to preserve error code set above. */ | |
1342 | goto out_wait; | |
1343 | } | |
1344 | ||
1345 | release_sock(sk); | |
1346 | timeout = schedule_timeout(timeout); | |
1347 | lock_sock(sk); | |
1348 | ||
1349 | if (signal_pending(current)) { | |
1350 | err = sock_intr_errno(timeout); | |
3b4477d2 | 1351 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 | 1352 | sock->state = SS_UNCONNECTED; |
380feae0 | 1353 | vsock_transport_cancel_pkt(vsk); |
f7f9b5e7 | 1354 | goto out_wait; |
d021c344 AK |
1355 | } else if (timeout == 0) { |
1356 | err = -ETIMEDOUT; | |
3b4477d2 | 1357 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 | 1358 | sock->state = SS_UNCONNECTED; |
380feae0 | 1359 | vsock_transport_cancel_pkt(vsk); |
f7f9b5e7 | 1360 | goto out_wait; |
d021c344 AK |
1361 | } |
1362 | ||
1363 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1364 | } | |
1365 | ||
1366 | if (sk->sk_err) { | |
1367 | err = -sk->sk_err; | |
3b4477d2 | 1368 | sk->sk_state = TCP_CLOSE; |
f7f9b5e7 CI |
1369 | sock->state = SS_UNCONNECTED; |
1370 | } else { | |
d021c344 | 1371 | err = 0; |
f7f9b5e7 | 1372 | } |
d021c344 AK |
1373 | |
1374 | out_wait: | |
1375 | finish_wait(sk_sleep(sk), &wait); | |
1376 | out: | |
1377 | release_sock(sk); | |
1378 | return err; | |
d021c344 AK |
1379 | } |
1380 | ||
cdfbabfb DH |
1381 | static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, |
1382 | bool kern) | |
d021c344 AK |
1383 | { |
1384 | struct sock *listener; | |
1385 | int err; | |
1386 | struct sock *connected; | |
1387 | struct vsock_sock *vconnected; | |
1388 | long timeout; | |
1389 | DEFINE_WAIT(wait); | |
1390 | ||
1391 | err = 0; | |
1392 | listener = sock->sk; | |
1393 | ||
1394 | lock_sock(listener); | |
1395 | ||
1396 | if (sock->type != SOCK_STREAM) { | |
1397 | err = -EOPNOTSUPP; | |
1398 | goto out; | |
1399 | } | |
1400 | ||
3b4477d2 | 1401 | if (listener->sk_state != TCP_LISTEN) { |
d021c344 AK |
1402 | err = -EINVAL; |
1403 | goto out; | |
1404 | } | |
1405 | ||
1406 | /* Wait for children sockets to appear; these are the new sockets | |
1407 | * created upon connection establishment. | |
1408 | */ | |
7e0afbdf | 1409 | timeout = sock_rcvtimeo(listener, flags & O_NONBLOCK); |
d021c344 AK |
1410 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); |
1411 | ||
1412 | while ((connected = vsock_dequeue_accept(listener)) == NULL && | |
1413 | listener->sk_err == 0) { | |
1414 | release_sock(listener); | |
1415 | timeout = schedule_timeout(timeout); | |
f7f9b5e7 | 1416 | finish_wait(sk_sleep(listener), &wait); |
d021c344 AK |
1417 | lock_sock(listener); |
1418 | ||
1419 | if (signal_pending(current)) { | |
1420 | err = sock_intr_errno(timeout); | |
f7f9b5e7 | 1421 | goto out; |
d021c344 AK |
1422 | } else if (timeout == 0) { |
1423 | err = -EAGAIN; | |
f7f9b5e7 | 1424 | goto out; |
d021c344 AK |
1425 | } |
1426 | ||
1427 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); | |
1428 | } | |
f7f9b5e7 | 1429 | finish_wait(sk_sleep(listener), &wait); |
d021c344 AK |
1430 | |
1431 | if (listener->sk_err) | |
1432 | err = -listener->sk_err; | |
1433 | ||
1434 | if (connected) { | |
7976a11b | 1435 | sk_acceptq_removed(listener); |
d021c344 | 1436 | |
4192f672 | 1437 | lock_sock_nested(connected, SINGLE_DEPTH_NESTING); |
d021c344 AK |
1438 | vconnected = vsock_sk(connected); |
1439 | ||
1440 | /* If the listener socket has received an error, then we should | |
1441 | * reject this socket and return. Note that we simply mark the | |
1442 | * socket rejected, drop our reference, and let the cleanup | |
1443 | * function handle the cleanup; the fact that we found it in | |
1444 | * the listener's accept queue guarantees that the cleanup | |
1445 | * function hasn't run yet. | |
1446 | */ | |
1447 | if (err) { | |
1448 | vconnected->rejected = true; | |
f7f9b5e7 CI |
1449 | } else { |
1450 | newsock->state = SS_CONNECTED; | |
1451 | sock_graft(connected, newsock); | |
d021c344 AK |
1452 | } |
1453 | ||
d021c344 AK |
1454 | release_sock(connected); |
1455 | sock_put(connected); | |
1456 | } | |
1457 | ||
d021c344 AK |
1458 | out: |
1459 | release_sock(listener); | |
1460 | return err; | |
1461 | } | |
1462 | ||
1463 | static int vsock_listen(struct socket *sock, int backlog) | |
1464 | { | |
1465 | int err; | |
1466 | struct sock *sk; | |
1467 | struct vsock_sock *vsk; | |
1468 | ||
1469 | sk = sock->sk; | |
1470 | ||
1471 | lock_sock(sk); | |
1472 | ||
1473 | if (sock->type != SOCK_STREAM) { | |
1474 | err = -EOPNOTSUPP; | |
1475 | goto out; | |
1476 | } | |
1477 | ||
1478 | if (sock->state != SS_UNCONNECTED) { | |
1479 | err = -EINVAL; | |
1480 | goto out; | |
1481 | } | |
1482 | ||
1483 | vsk = vsock_sk(sk); | |
1484 | ||
1485 | if (!vsock_addr_bound(&vsk->local_addr)) { | |
1486 | err = -EINVAL; | |
1487 | goto out; | |
1488 | } | |
1489 | ||
1490 | sk->sk_max_ack_backlog = backlog; | |
3b4477d2 | 1491 | sk->sk_state = TCP_LISTEN; |
d021c344 AK |
1492 | |
1493 | err = 0; | |
1494 | ||
1495 | out: | |
1496 | release_sock(sk); | |
1497 | return err; | |
1498 | } | |
1499 | ||
b9f2b0ff SG |
1500 | static void vsock_update_buffer_size(struct vsock_sock *vsk, |
1501 | const struct vsock_transport *transport, | |
1502 | u64 val) | |
1503 | { | |
1504 | if (val > vsk->buffer_max_size) | |
1505 | val = vsk->buffer_max_size; | |
1506 | ||
1507 | if (val < vsk->buffer_min_size) | |
1508 | val = vsk->buffer_min_size; | |
1509 | ||
1510 | if (val != vsk->buffer_size && | |
1511 | transport && transport->notify_buffer_size) | |
1512 | transport->notify_buffer_size(vsk, &val); | |
1513 | ||
1514 | vsk->buffer_size = val; | |
1515 | } | |
1516 | ||
d021c344 AK |
1517 | static int vsock_stream_setsockopt(struct socket *sock, |
1518 | int level, | |
1519 | int optname, | |
a7b75c5a | 1520 | sockptr_t optval, |
d021c344 AK |
1521 | unsigned int optlen) |
1522 | { | |
1523 | int err; | |
1524 | struct sock *sk; | |
1525 | struct vsock_sock *vsk; | |
fe502c4a | 1526 | const struct vsock_transport *transport; |
d021c344 AK |
1527 | u64 val; |
1528 | ||
1529 | if (level != AF_VSOCK) | |
1530 | return -ENOPROTOOPT; | |
1531 | ||
1532 | #define COPY_IN(_v) \ | |
1533 | do { \ | |
1534 | if (optlen < sizeof(_v)) { \ | |
1535 | err = -EINVAL; \ | |
1536 | goto exit; \ | |
1537 | } \ | |
a7b75c5a | 1538 | if (copy_from_sockptr(&_v, optval, sizeof(_v)) != 0) { \ |
d021c344 AK |
1539 | err = -EFAULT; \ |
1540 | goto exit; \ | |
1541 | } \ | |
1542 | } while (0) | |
1543 | ||
1544 | err = 0; | |
1545 | sk = sock->sk; | |
1546 | vsk = vsock_sk(sk); | |
fe502c4a | 1547 | transport = vsk->transport; |
d021c344 AK |
1548 | |
1549 | lock_sock(sk); | |
1550 | ||
1551 | switch (optname) { | |
1552 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
1553 | COPY_IN(val); | |
b9f2b0ff | 1554 | vsock_update_buffer_size(vsk, transport, val); |
d021c344 AK |
1555 | break; |
1556 | ||
1557 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
1558 | COPY_IN(val); | |
b9f2b0ff SG |
1559 | vsk->buffer_max_size = val; |
1560 | vsock_update_buffer_size(vsk, transport, vsk->buffer_size); | |
d021c344 AK |
1561 | break; |
1562 | ||
1563 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
1564 | COPY_IN(val); | |
b9f2b0ff SG |
1565 | vsk->buffer_min_size = val; |
1566 | vsock_update_buffer_size(vsk, transport, vsk->buffer_size); | |
d021c344 AK |
1567 | break; |
1568 | ||
1569 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
fe0c72f3 | 1570 | struct __kernel_old_timeval tv; |
d021c344 AK |
1571 | COPY_IN(tv); |
1572 | if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && | |
1573 | tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { | |
1574 | vsk->connect_timeout = tv.tv_sec * HZ + | |
1575 | DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); | |
1576 | if (vsk->connect_timeout == 0) | |
1577 | vsk->connect_timeout = | |
1578 | VSOCK_DEFAULT_CONNECT_TIMEOUT; | |
1579 | ||
1580 | } else { | |
1581 | err = -ERANGE; | |
1582 | } | |
1583 | break; | |
1584 | } | |
1585 | ||
1586 | default: | |
1587 | err = -ENOPROTOOPT; | |
1588 | break; | |
1589 | } | |
1590 | ||
1591 | #undef COPY_IN | |
1592 | ||
1593 | exit: | |
1594 | release_sock(sk); | |
1595 | return err; | |
1596 | } | |
1597 | ||
1598 | static int vsock_stream_getsockopt(struct socket *sock, | |
1599 | int level, int optname, | |
1600 | char __user *optval, | |
1601 | int __user *optlen) | |
1602 | { | |
1603 | int err; | |
1604 | int len; | |
1605 | struct sock *sk; | |
1606 | struct vsock_sock *vsk; | |
1607 | u64 val; | |
1608 | ||
1609 | if (level != AF_VSOCK) | |
1610 | return -ENOPROTOOPT; | |
1611 | ||
1612 | err = get_user(len, optlen); | |
1613 | if (err != 0) | |
1614 | return err; | |
1615 | ||
1616 | #define COPY_OUT(_v) \ | |
1617 | do { \ | |
1618 | if (len < sizeof(_v)) \ | |
1619 | return -EINVAL; \ | |
1620 | \ | |
1621 | len = sizeof(_v); \ | |
1622 | if (copy_to_user(optval, &_v, len) != 0) \ | |
1623 | return -EFAULT; \ | |
1624 | \ | |
1625 | } while (0) | |
1626 | ||
1627 | err = 0; | |
1628 | sk = sock->sk; | |
1629 | vsk = vsock_sk(sk); | |
1630 | ||
1631 | switch (optname) { | |
1632 | case SO_VM_SOCKETS_BUFFER_SIZE: | |
b9f2b0ff | 1633 | val = vsk->buffer_size; |
d021c344 AK |
1634 | COPY_OUT(val); |
1635 | break; | |
1636 | ||
1637 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: | |
b9f2b0ff | 1638 | val = vsk->buffer_max_size; |
d021c344 AK |
1639 | COPY_OUT(val); |
1640 | break; | |
1641 | ||
1642 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: | |
b9f2b0ff | 1643 | val = vsk->buffer_min_size; |
d021c344 AK |
1644 | COPY_OUT(val); |
1645 | break; | |
1646 | ||
1647 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { | |
fe0c72f3 | 1648 | struct __kernel_old_timeval tv; |
d021c344 AK |
1649 | tv.tv_sec = vsk->connect_timeout / HZ; |
1650 | tv.tv_usec = | |
1651 | (vsk->connect_timeout - | |
1652 | tv.tv_sec * HZ) * (1000000 / HZ); | |
1653 | COPY_OUT(tv); | |
1654 | break; | |
1655 | } | |
1656 | default: | |
1657 | return -ENOPROTOOPT; | |
1658 | } | |
1659 | ||
1660 | err = put_user(len, optlen); | |
1661 | if (err != 0) | |
1662 | return -EFAULT; | |
1663 | ||
1664 | #undef COPY_OUT | |
1665 | ||
1666 | return 0; | |
1667 | } | |
1668 | ||
1b784140 YX |
1669 | static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, |
1670 | size_t len) | |
d021c344 AK |
1671 | { |
1672 | struct sock *sk; | |
1673 | struct vsock_sock *vsk; | |
fe502c4a | 1674 | const struct vsock_transport *transport; |
d021c344 AK |
1675 | ssize_t total_written; |
1676 | long timeout; | |
1677 | int err; | |
1678 | struct vsock_transport_send_notify_data send_data; | |
499fde66 | 1679 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
d021c344 AK |
1680 | |
1681 | sk = sock->sk; | |
1682 | vsk = vsock_sk(sk); | |
fe502c4a | 1683 | transport = vsk->transport; |
d021c344 AK |
1684 | total_written = 0; |
1685 | err = 0; | |
1686 | ||
1687 | if (msg->msg_flags & MSG_OOB) | |
1688 | return -EOPNOTSUPP; | |
1689 | ||
1690 | lock_sock(sk); | |
1691 | ||
1692 | /* Callers should not provide a destination with stream sockets. */ | |
1693 | if (msg->msg_namelen) { | |
3b4477d2 | 1694 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; |
d021c344 AK |
1695 | goto out; |
1696 | } | |
1697 | ||
1698 | /* Send data only if both sides are not shutdown in the direction. */ | |
1699 | if (sk->sk_shutdown & SEND_SHUTDOWN || | |
1700 | vsk->peer_shutdown & RCV_SHUTDOWN) { | |
1701 | err = -EPIPE; | |
1702 | goto out; | |
1703 | } | |
1704 | ||
c0cfa2d8 | 1705 | if (!transport || sk->sk_state != TCP_ESTABLISHED || |
d021c344 AK |
1706 | !vsock_addr_bound(&vsk->local_addr)) { |
1707 | err = -ENOTCONN; | |
1708 | goto out; | |
1709 | } | |
1710 | ||
1711 | if (!vsock_addr_bound(&vsk->remote_addr)) { | |
1712 | err = -EDESTADDRREQ; | |
1713 | goto out; | |
1714 | } | |
1715 | ||
1716 | /* Wait for room in the produce queue to enqueue our user's data. */ | |
1717 | timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1718 | ||
1719 | err = transport->notify_send_init(vsk, &send_data); | |
1720 | if (err < 0) | |
1721 | goto out; | |
1722 | ||
d021c344 AK |
1723 | while (total_written < len) { |
1724 | ssize_t written; | |
1725 | ||
499fde66 | 1726 | add_wait_queue(sk_sleep(sk), &wait); |
d021c344 AK |
1727 | while (vsock_stream_has_space(vsk) == 0 && |
1728 | sk->sk_err == 0 && | |
1729 | !(sk->sk_shutdown & SEND_SHUTDOWN) && | |
1730 | !(vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1731 | ||
1732 | /* Don't wait for non-blocking sockets. */ | |
1733 | if (timeout == 0) { | |
1734 | err = -EAGAIN; | |
499fde66 | 1735 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1736 | goto out_err; |
d021c344 AK |
1737 | } |
1738 | ||
1739 | err = transport->notify_send_pre_block(vsk, &send_data); | |
f7f9b5e7 | 1740 | if (err < 0) { |
499fde66 | 1741 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 CI |
1742 | goto out_err; |
1743 | } | |
d021c344 AK |
1744 | |
1745 | release_sock(sk); | |
499fde66 | 1746 | timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); |
d021c344 AK |
1747 | lock_sock(sk); |
1748 | if (signal_pending(current)) { | |
1749 | err = sock_intr_errno(timeout); | |
499fde66 | 1750 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1751 | goto out_err; |
d021c344 AK |
1752 | } else if (timeout == 0) { |
1753 | err = -EAGAIN; | |
499fde66 | 1754 | remove_wait_queue(sk_sleep(sk), &wait); |
f7f9b5e7 | 1755 | goto out_err; |
d021c344 | 1756 | } |
d021c344 | 1757 | } |
499fde66 | 1758 | remove_wait_queue(sk_sleep(sk), &wait); |
d021c344 AK |
1759 | |
1760 | /* These checks occur both as part of and after the loop | |
1761 | * conditional since we need to check before and after | |
1762 | * sleeping. | |
1763 | */ | |
1764 | if (sk->sk_err) { | |
1765 | err = -sk->sk_err; | |
f7f9b5e7 | 1766 | goto out_err; |
d021c344 AK |
1767 | } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || |
1768 | (vsk->peer_shutdown & RCV_SHUTDOWN)) { | |
1769 | err = -EPIPE; | |
f7f9b5e7 | 1770 | goto out_err; |
d021c344 AK |
1771 | } |
1772 | ||
1773 | err = transport->notify_send_pre_enqueue(vsk, &send_data); | |
1774 | if (err < 0) | |
f7f9b5e7 | 1775 | goto out_err; |
d021c344 AK |
1776 | |
1777 | /* Note that enqueue will only write as many bytes as are free | |
1778 | * in the produce queue, so we don't need to ensure len is | |
1779 | * smaller than the queue size. It is the caller's | |
1780 | * responsibility to check how many bytes we were able to send. | |
1781 | */ | |
1782 | ||
1783 | written = transport->stream_enqueue( | |
0f7db23a | 1784 | vsk, msg, |
d021c344 AK |
1785 | len - total_written); |
1786 | if (written < 0) { | |
1787 | err = -ENOMEM; | |
f7f9b5e7 | 1788 | goto out_err; |
d021c344 AK |
1789 | } |
1790 | ||
1791 | total_written += written; | |
1792 | ||
1793 | err = transport->notify_send_post_enqueue( | |
1794 | vsk, written, &send_data); | |
1795 | if (err < 0) | |
f7f9b5e7 | 1796 | goto out_err; |
d021c344 AK |
1797 | |
1798 | } | |
1799 | ||
f7f9b5e7 | 1800 | out_err: |
d021c344 AK |
1801 | if (total_written > 0) |
1802 | err = total_written; | |
d021c344 AK |
1803 | out: |
1804 | release_sock(sk); | |
1805 | return err; | |
1806 | } | |
1807 | ||
1808 | ||
1809 | static int | |
1b784140 YX |
1810 | vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
1811 | int flags) | |
d021c344 AK |
1812 | { |
1813 | struct sock *sk; | |
1814 | struct vsock_sock *vsk; | |
fe502c4a | 1815 | const struct vsock_transport *transport; |
d021c344 AK |
1816 | int err; |
1817 | size_t target; | |
1818 | ssize_t copied; | |
1819 | long timeout; | |
1820 | struct vsock_transport_recv_notify_data recv_data; | |
1821 | ||
1822 | DEFINE_WAIT(wait); | |
1823 | ||
1824 | sk = sock->sk; | |
1825 | vsk = vsock_sk(sk); | |
fe502c4a | 1826 | transport = vsk->transport; |
d021c344 AK |
1827 | err = 0; |
1828 | ||
1829 | lock_sock(sk); | |
1830 | ||
c0cfa2d8 | 1831 | if (!transport || sk->sk_state != TCP_ESTABLISHED) { |
d021c344 AK |
1832 | /* Recvmsg is supposed to return 0 if a peer performs an |
1833 | * orderly shutdown. Differentiate between that case and when a | |
1834 | * peer has not connected or a local shutdown occured with the | |
1835 | * SOCK_DONE flag. | |
1836 | */ | |
1837 | if (sock_flag(sk, SOCK_DONE)) | |
1838 | err = 0; | |
1839 | else | |
1840 | err = -ENOTCONN; | |
1841 | ||
1842 | goto out; | |
1843 | } | |
1844 | ||
1845 | if (flags & MSG_OOB) { | |
1846 | err = -EOPNOTSUPP; | |
1847 | goto out; | |
1848 | } | |
1849 | ||
1850 | /* We don't check peer_shutdown flag here since peer may actually shut | |
1851 | * down, but there can be data in the queue that a local socket can | |
1852 | * receive. | |
1853 | */ | |
1854 | if (sk->sk_shutdown & RCV_SHUTDOWN) { | |
1855 | err = 0; | |
1856 | goto out; | |
1857 | } | |
1858 | ||
1859 | /* It is valid on Linux to pass in a zero-length receive buffer. This | |
1860 | * is not an error. We may as well bail out now. | |
1861 | */ | |
1862 | if (!len) { | |
1863 | err = 0; | |
1864 | goto out; | |
1865 | } | |
1866 | ||
1867 | /* We must not copy less than target bytes into the user's buffer | |
1868 | * before returning successfully, so we wait for the consume queue to | |
1869 | * have that much data to consume before dequeueing. Note that this | |
1870 | * makes it impossible to handle cases where target is greater than the | |
1871 | * queue size. | |
1872 | */ | |
1873 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
1874 | if (target >= transport->stream_rcvhiwat(vsk)) { | |
1875 | err = -ENOMEM; | |
1876 | goto out; | |
1877 | } | |
1878 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1879 | copied = 0; | |
1880 | ||
1881 | err = transport->notify_recv_init(vsk, target, &recv_data); | |
1882 | if (err < 0) | |
1883 | goto out; | |
1884 | ||
d021c344 AK |
1885 | |
1886 | while (1) { | |
f7f9b5e7 | 1887 | s64 ready; |
d021c344 | 1888 | |
f7f9b5e7 CI |
1889 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1890 | ready = vsock_stream_has_data(vsk); | |
d021c344 | 1891 | |
f7f9b5e7 CI |
1892 | if (ready == 0) { |
1893 | if (sk->sk_err != 0 || | |
1894 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1895 | (vsk->peer_shutdown & SEND_SHUTDOWN)) { | |
1896 | finish_wait(sk_sleep(sk), &wait); | |
1897 | break; | |
1898 | } | |
1899 | /* Don't wait for non-blocking sockets. */ | |
1900 | if (timeout == 0) { | |
1901 | err = -EAGAIN; | |
1902 | finish_wait(sk_sleep(sk), &wait); | |
1903 | break; | |
1904 | } | |
1905 | ||
1906 | err = transport->notify_recv_pre_block( | |
1907 | vsk, target, &recv_data); | |
1908 | if (err < 0) { | |
1909 | finish_wait(sk_sleep(sk), &wait); | |
1910 | break; | |
1911 | } | |
1912 | release_sock(sk); | |
1913 | timeout = schedule_timeout(timeout); | |
1914 | lock_sock(sk); | |
1915 | ||
1916 | if (signal_pending(current)) { | |
1917 | err = sock_intr_errno(timeout); | |
1918 | finish_wait(sk_sleep(sk), &wait); | |
1919 | break; | |
1920 | } else if (timeout == 0) { | |
1921 | err = -EAGAIN; | |
1922 | finish_wait(sk_sleep(sk), &wait); | |
1923 | break; | |
1924 | } | |
1925 | } else { | |
d021c344 AK |
1926 | ssize_t read; |
1927 | ||
f7f9b5e7 CI |
1928 | finish_wait(sk_sleep(sk), &wait); |
1929 | ||
1930 | if (ready < 0) { | |
1931 | /* Invalid queue pair content. XXX This should | |
1932 | * be changed to a connection reset in a later | |
1933 | * change. | |
1934 | */ | |
1935 | ||
1936 | err = -ENOMEM; | |
1937 | goto out; | |
1938 | } | |
1939 | ||
d021c344 AK |
1940 | err = transport->notify_recv_pre_dequeue( |
1941 | vsk, target, &recv_data); | |
1942 | if (err < 0) | |
1943 | break; | |
1944 | ||
1945 | read = transport->stream_dequeue( | |
0f7db23a | 1946 | vsk, msg, |
d021c344 AK |
1947 | len - copied, flags); |
1948 | if (read < 0) { | |
1949 | err = -ENOMEM; | |
1950 | break; | |
1951 | } | |
1952 | ||
1953 | copied += read; | |
1954 | ||
1955 | err = transport->notify_recv_post_dequeue( | |
1956 | vsk, target, read, | |
1957 | !(flags & MSG_PEEK), &recv_data); | |
1958 | if (err < 0) | |
f7f9b5e7 | 1959 | goto out; |
d021c344 AK |
1960 | |
1961 | if (read >= target || flags & MSG_PEEK) | |
1962 | break; | |
1963 | ||
1964 | target -= read; | |
d021c344 AK |
1965 | } |
1966 | } | |
1967 | ||
1968 | if (sk->sk_err) | |
1969 | err = -sk->sk_err; | |
1970 | else if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1971 | err = 0; | |
1972 | ||
dedc58e0 | 1973 | if (copied > 0) |
d021c344 | 1974 | err = copied; |
d021c344 | 1975 | |
d021c344 AK |
1976 | out: |
1977 | release_sock(sk); | |
1978 | return err; | |
1979 | } | |
1980 | ||
1981 | static const struct proto_ops vsock_stream_ops = { | |
1982 | .family = PF_VSOCK, | |
1983 | .owner = THIS_MODULE, | |
1984 | .release = vsock_release, | |
1985 | .bind = vsock_bind, | |
1986 | .connect = vsock_stream_connect, | |
1987 | .socketpair = sock_no_socketpair, | |
1988 | .accept = vsock_accept, | |
1989 | .getname = vsock_getname, | |
a11e1d43 | 1990 | .poll = vsock_poll, |
d021c344 AK |
1991 | .ioctl = sock_no_ioctl, |
1992 | .listen = vsock_listen, | |
1993 | .shutdown = vsock_shutdown, | |
1994 | .setsockopt = vsock_stream_setsockopt, | |
1995 | .getsockopt = vsock_stream_getsockopt, | |
1996 | .sendmsg = vsock_stream_sendmsg, | |
1997 | .recvmsg = vsock_stream_recvmsg, | |
1998 | .mmap = sock_no_mmap, | |
1999 | .sendpage = sock_no_sendpage, | |
2000 | }; | |
2001 | ||
2002 | static int vsock_create(struct net *net, struct socket *sock, | |
2003 | int protocol, int kern) | |
2004 | { | |
c0cfa2d8 | 2005 | struct vsock_sock *vsk; |
55f3e149 | 2006 | struct sock *sk; |
c0cfa2d8 | 2007 | int ret; |
55f3e149 | 2008 | |
d021c344 AK |
2009 | if (!sock) |
2010 | return -EINVAL; | |
2011 | ||
6cf1c5fc | 2012 | if (protocol && protocol != PF_VSOCK) |
d021c344 AK |
2013 | return -EPROTONOSUPPORT; |
2014 | ||
2015 | switch (sock->type) { | |
2016 | case SOCK_DGRAM: | |
2017 | sock->ops = &vsock_dgram_ops; | |
2018 | break; | |
2019 | case SOCK_STREAM: | |
2020 | sock->ops = &vsock_stream_ops; | |
2021 | break; | |
2022 | default: | |
2023 | return -ESOCKTNOSUPPORT; | |
2024 | } | |
2025 | ||
2026 | sock->state = SS_UNCONNECTED; | |
2027 | ||
55f3e149 SG |
2028 | sk = __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern); |
2029 | if (!sk) | |
2030 | return -ENOMEM; | |
2031 | ||
c0cfa2d8 SG |
2032 | vsk = vsock_sk(sk); |
2033 | ||
2034 | if (sock->type == SOCK_DGRAM) { | |
2035 | ret = vsock_assign_transport(vsk, NULL); | |
2036 | if (ret < 0) { | |
2037 | sock_put(sk); | |
2038 | return ret; | |
2039 | } | |
2040 | } | |
2041 | ||
2042 | vsock_insert_unbound(vsk); | |
55f3e149 SG |
2043 | |
2044 | return 0; | |
d021c344 AK |
2045 | } |
2046 | ||
2047 | static const struct net_proto_family vsock_family_ops = { | |
2048 | .family = AF_VSOCK, | |
2049 | .create = vsock_create, | |
2050 | .owner = THIS_MODULE, | |
2051 | }; | |
2052 | ||
2053 | static long vsock_dev_do_ioctl(struct file *filp, | |
2054 | unsigned int cmd, void __user *ptr) | |
2055 | { | |
2056 | u32 __user *p = ptr; | |
c0cfa2d8 | 2057 | u32 cid = VMADDR_CID_ANY; |
d021c344 AK |
2058 | int retval = 0; |
2059 | ||
2060 | switch (cmd) { | |
2061 | case IOCTL_VM_SOCKETS_GET_LOCAL_CID: | |
c0cfa2d8 SG |
2062 | /* To be compatible with the VMCI behavior, we prioritize the |
2063 | * guest CID instead of well-know host CID (VMADDR_CID_HOST). | |
2064 | */ | |
2065 | if (transport_g2h) | |
2066 | cid = transport_g2h->get_local_cid(); | |
2067 | else if (transport_h2g) | |
2068 | cid = transport_h2g->get_local_cid(); | |
2069 | ||
2070 | if (put_user(cid, p) != 0) | |
d021c344 AK |
2071 | retval = -EFAULT; |
2072 | break; | |
2073 | ||
2074 | default: | |
2075 | pr_err("Unknown ioctl %d\n", cmd); | |
2076 | retval = -EINVAL; | |
2077 | } | |
2078 | ||
2079 | return retval; | |
2080 | } | |
2081 | ||
2082 | static long vsock_dev_ioctl(struct file *filp, | |
2083 | unsigned int cmd, unsigned long arg) | |
2084 | { | |
2085 | return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); | |
2086 | } | |
2087 | ||
2088 | #ifdef CONFIG_COMPAT | |
2089 | static long vsock_dev_compat_ioctl(struct file *filp, | |
2090 | unsigned int cmd, unsigned long arg) | |
2091 | { | |
2092 | return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); | |
2093 | } | |
2094 | #endif | |
2095 | ||
2096 | static const struct file_operations vsock_device_ops = { | |
2097 | .owner = THIS_MODULE, | |
2098 | .unlocked_ioctl = vsock_dev_ioctl, | |
2099 | #ifdef CONFIG_COMPAT | |
2100 | .compat_ioctl = vsock_dev_compat_ioctl, | |
2101 | #endif | |
2102 | .open = nonseekable_open, | |
2103 | }; | |
2104 | ||
2105 | static struct miscdevice vsock_device = { | |
2106 | .name = "vsock", | |
d021c344 AK |
2107 | .fops = &vsock_device_ops, |
2108 | }; | |
2109 | ||
c0cfa2d8 | 2110 | static int __init vsock_init(void) |
d021c344 | 2111 | { |
c0cfa2d8 | 2112 | int err = 0; |
2c4a336e | 2113 | |
c0cfa2d8 | 2114 | vsock_init_tables(); |
d021c344 | 2115 | |
c0cfa2d8 | 2116 | vsock_proto.owner = THIS_MODULE; |
6ad0b2f7 | 2117 | vsock_device.minor = MISC_DYNAMIC_MINOR; |
d021c344 AK |
2118 | err = misc_register(&vsock_device); |
2119 | if (err) { | |
2120 | pr_err("Failed to register misc device\n"); | |
f6a835bb | 2121 | goto err_reset_transport; |
d021c344 AK |
2122 | } |
2123 | ||
2124 | err = proto_register(&vsock_proto, 1); /* we want our slab */ | |
2125 | if (err) { | |
2126 | pr_err("Cannot register vsock protocol\n"); | |
f6a835bb | 2127 | goto err_deregister_misc; |
d021c344 AK |
2128 | } |
2129 | ||
2130 | err = sock_register(&vsock_family_ops); | |
2131 | if (err) { | |
2132 | pr_err("could not register af_vsock (%d) address family: %d\n", | |
2133 | AF_VSOCK, err); | |
2134 | goto err_unregister_proto; | |
2135 | } | |
2136 | ||
2137 | return 0; | |
2138 | ||
2139 | err_unregister_proto: | |
2140 | proto_unregister(&vsock_proto); | |
f6a835bb | 2141 | err_deregister_misc: |
d021c344 | 2142 | misc_deregister(&vsock_device); |
f6a835bb | 2143 | err_reset_transport: |
2c4a336e | 2144 | return err; |
d021c344 | 2145 | } |
d021c344 | 2146 | |
c0cfa2d8 | 2147 | static void __exit vsock_exit(void) |
d021c344 | 2148 | { |
d021c344 AK |
2149 | misc_deregister(&vsock_device); |
2150 | sock_unregister(AF_VSOCK); | |
2151 | proto_unregister(&vsock_proto); | |
d021c344 | 2152 | } |
d021c344 | 2153 | |
daabfbca | 2154 | const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk) |
0b01aeb3 | 2155 | { |
daabfbca | 2156 | return vsk->transport; |
0b01aeb3 SH |
2157 | } |
2158 | EXPORT_SYMBOL_GPL(vsock_core_get_transport); | |
2159 | ||
c0cfa2d8 SG |
2160 | int vsock_core_register(const struct vsock_transport *t, int features) |
2161 | { | |
0e121905 | 2162 | const struct vsock_transport *t_h2g, *t_g2h, *t_dgram, *t_local; |
c0cfa2d8 SG |
2163 | int err = mutex_lock_interruptible(&vsock_register_mutex); |
2164 | ||
2165 | if (err) | |
2166 | return err; | |
2167 | ||
2168 | t_h2g = transport_h2g; | |
2169 | t_g2h = transport_g2h; | |
2170 | t_dgram = transport_dgram; | |
0e121905 | 2171 | t_local = transport_local; |
c0cfa2d8 SG |
2172 | |
2173 | if (features & VSOCK_TRANSPORT_F_H2G) { | |
2174 | if (t_h2g) { | |
2175 | err = -EBUSY; | |
2176 | goto err_busy; | |
2177 | } | |
2178 | t_h2g = t; | |
2179 | } | |
2180 | ||
2181 | if (features & VSOCK_TRANSPORT_F_G2H) { | |
2182 | if (t_g2h) { | |
2183 | err = -EBUSY; | |
2184 | goto err_busy; | |
2185 | } | |
2186 | t_g2h = t; | |
2187 | } | |
2188 | ||
2189 | if (features & VSOCK_TRANSPORT_F_DGRAM) { | |
2190 | if (t_dgram) { | |
2191 | err = -EBUSY; | |
2192 | goto err_busy; | |
2193 | } | |
2194 | t_dgram = t; | |
2195 | } | |
2196 | ||
0e121905 SG |
2197 | if (features & VSOCK_TRANSPORT_F_LOCAL) { |
2198 | if (t_local) { | |
2199 | err = -EBUSY; | |
2200 | goto err_busy; | |
2201 | } | |
2202 | t_local = t; | |
2203 | } | |
2204 | ||
c0cfa2d8 SG |
2205 | transport_h2g = t_h2g; |
2206 | transport_g2h = t_g2h; | |
2207 | transport_dgram = t_dgram; | |
0e121905 | 2208 | transport_local = t_local; |
c0cfa2d8 SG |
2209 | |
2210 | err_busy: | |
2211 | mutex_unlock(&vsock_register_mutex); | |
2212 | return err; | |
2213 | } | |
2214 | EXPORT_SYMBOL_GPL(vsock_core_register); | |
2215 | ||
2216 | void vsock_core_unregister(const struct vsock_transport *t) | |
05e489b1 | 2217 | { |
c0cfa2d8 SG |
2218 | mutex_lock(&vsock_register_mutex); |
2219 | ||
2220 | if (transport_h2g == t) | |
2221 | transport_h2g = NULL; | |
2222 | ||
2223 | if (transport_g2h == t) | |
2224 | transport_g2h = NULL; | |
2225 | ||
2226 | if (transport_dgram == t) | |
2227 | transport_dgram = NULL; | |
2228 | ||
0e121905 SG |
2229 | if (transport_local == t) |
2230 | transport_local = NULL; | |
2231 | ||
c0cfa2d8 | 2232 | mutex_unlock(&vsock_register_mutex); |
05e489b1 | 2233 | } |
c0cfa2d8 | 2234 | EXPORT_SYMBOL_GPL(vsock_core_unregister); |
05e489b1 | 2235 | |
c0cfa2d8 | 2236 | module_init(vsock_init); |
05e489b1 | 2237 | module_exit(vsock_exit); |
c1eef220 | 2238 | |
d021c344 AK |
2239 | MODULE_AUTHOR("VMware, Inc."); |
2240 | MODULE_DESCRIPTION("VMware Virtual Socket Family"); | |
1190cfdb | 2241 | MODULE_VERSION("1.0.2.0-k"); |
d021c344 | 2242 | MODULE_LICENSE("GPL v2"); |