Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1 | /* |
| 2 | * VMware vSockets Driver |
| 3 | * |
| 4 | * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the Free |
| 8 | * Software Foundation version 2 and no later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | */ |
| 15 | |
| 16 | /* Implementation notes: |
| 17 | * |
| 18 | * - There are two kinds of sockets: those created by user action (such as |
| 19 | * calling socket(2)) and those created by incoming connection request packets. |
| 20 | * |
| 21 | * - There are two "global" tables, one for bound sockets (sockets that have |
| 22 | * specified an address that they are responsible for) and one for connected |
| 23 | * sockets (sockets that have established a connection with another socket). |
| 24 | * These tables are "global" in that all sockets on the system are placed |
| 25 | * within them. - Note, though, that the bound table contains an extra entry |
| 26 | * for a list of unbound sockets and SOCK_DGRAM sockets will always remain in |
| 27 | * that list. The bound table is used solely for lookup of sockets when packets |
| 28 | * are received and that's not necessary for SOCK_DGRAM sockets since we create |
| 29 | * a datagram handle for each and need not perform a lookup. Keeping SOCK_DGRAM |
| 30 | * sockets out of the bound hash buckets will reduce the chance of collisions |
| 31 | * when looking for SOCK_STREAM sockets and prevents us from having to check the |
| 32 | * socket type in the hash table lookups. |
| 33 | * |
| 34 | * - Sockets created by user action will either be "client" sockets that |
| 35 | * initiate a connection or "server" sockets that listen for connections; we do |
| 36 | * not support simultaneous connects (two "client" sockets connecting). |
| 37 | * |
| 38 | * - "Server" sockets are referred to as listener sockets throughout this |
Stefan Hajnoczi | ea3803c | 2015-10-29 11:57:42 +0000 | [diff] [blame] | 39 | * implementation because they are in the VSOCK_SS_LISTEN state. When a |
| 40 | * connection request is received (the second kind of socket mentioned above), |
| 41 | * we create a new socket and refer to it as a pending socket. These pending |
| 42 | * sockets are placed on the pending connection list of the listener socket. |
| 43 | * When future packets are received for the address the listener socket is |
| 44 | * bound to, we check if the source of the packet is from one that has an |
| 45 | * existing pending connection. If it does, we process the packet for the |
| 46 | * pending socket. When that socket reaches the connected state, it is removed |
| 47 | * from the listener socket's pending list and enqueued in the listener |
| 48 | * socket's accept queue. Callers of accept(2) will accept connected sockets |
| 49 | * from the listener socket's accept queue. If the socket cannot be accepted |
| 50 | * for some reason then it is marked rejected. Once the connection is |
| 51 | * accepted, it is owned by the user process and the responsibility for cleanup |
| 52 | * falls with that user process. |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 53 | * |
| 54 | * - It is possible that these pending sockets will never reach the connected |
| 55 | * state; in fact, we may never receive another packet after the connection |
| 56 | * request. Because of this, we must schedule a cleanup function to run in the |
| 57 | * future, after some amount of time passes where a connection should have been |
| 58 | * established. This function ensures that the socket is off all lists so it |
| 59 | * cannot be retrieved, then drops all references to the socket so it is cleaned |
| 60 | * up (sock_put() -> sk_free() -> our sk_destruct implementation). Note this |
| 61 | * function will also cleanup rejected sockets, those that reach the connected |
| 62 | * state but leave it before they have been accepted. |
| 63 | * |
Stefan Hajnoczi | 4192f67 | 2016-06-23 16:28:58 +0100 | [diff] [blame] | 64 | * - Lock ordering for pending or accept queue sockets is: |
| 65 | * |
| 66 | * lock_sock(listener); |
| 67 | * lock_sock_nested(pending, SINGLE_DEPTH_NESTING); |
| 68 | * |
| 69 | * Using explicit nested locking keeps lockdep happy since normally only one |
| 70 | * lock of a given class may be taken at a time. |
| 71 | * |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 72 | * - Sockets created by user action will be cleaned up when the user process |
| 73 | * calls close(2), causing our release implementation to be called. Our release |
| 74 | * implementation will perform some cleanup then drop the last reference so our |
| 75 | * sk_destruct implementation is invoked. Our sk_destruct implementation will |
| 76 | * perform additional cleanup that's common for both types of sockets. |
| 77 | * |
| 78 | * - A socket's reference count is what ensures that the structure won't be |
| 79 | * freed. Each entry in a list (such as the "global" bound and connected tables |
| 80 | * and the listener socket's pending list and connected queue) ensures a |
| 81 | * reference. When we defer work until process context and pass a socket as our |
| 82 | * argument, we must ensure the reference count is increased to ensure the |
| 83 | * socket isn't freed before the function is run; the deferred function will |
| 84 | * then drop the reference. |
| 85 | */ |
| 86 | |
| 87 | #include <linux/types.h> |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 88 | #include <linux/bitops.h> |
| 89 | #include <linux/cred.h> |
| 90 | #include <linux/init.h> |
| 91 | #include <linux/io.h> |
| 92 | #include <linux/kernel.h> |
Ingo Molnar | 174cd4b | 2017-02-02 19:15:33 +0100 | [diff] [blame] | 93 | #include <linux/sched/signal.h> |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 94 | #include <linux/kmod.h> |
| 95 | #include <linux/list.h> |
| 96 | #include <linux/miscdevice.h> |
| 97 | #include <linux/module.h> |
| 98 | #include <linux/mutex.h> |
| 99 | #include <linux/net.h> |
| 100 | #include <linux/poll.h> |
| 101 | #include <linux/skbuff.h> |
| 102 | #include <linux/smp.h> |
| 103 | #include <linux/socket.h> |
| 104 | #include <linux/stddef.h> |
| 105 | #include <linux/unistd.h> |
| 106 | #include <linux/wait.h> |
| 107 | #include <linux/workqueue.h> |
| 108 | #include <net/sock.h> |
Asias He | 82a54d0 | 2013-07-25 17:39:34 +0800 | [diff] [blame] | 109 | #include <net/af_vsock.h> |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 110 | |
| 111 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); |
| 112 | static void vsock_sk_destruct(struct sock *sk); |
| 113 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
| 114 | |
| 115 | /* Protocol family. */ |
| 116 | static struct proto vsock_proto = { |
| 117 | .name = "AF_VSOCK", |
| 118 | .owner = THIS_MODULE, |
| 119 | .obj_size = sizeof(struct vsock_sock), |
| 120 | }; |
| 121 | |
| 122 | /* The default peer timeout indicates how long we will wait for a peer response |
| 123 | * to a control message. |
| 124 | */ |
| 125 | #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) |
| 126 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 127 | static const struct vsock_transport *transport; |
| 128 | static DEFINE_MUTEX(vsock_register_mutex); |
| 129 | |
| 130 | /**** EXPORTS ****/ |
| 131 | |
| 132 | /* Get the ID of the local context. This is transport dependent. */ |
| 133 | |
| 134 | int vm_sockets_get_local_cid(void) |
| 135 | { |
| 136 | return transport->get_local_cid(); |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid); |
| 139 | |
| 140 | /**** UTILS ****/ |
| 141 | |
| 142 | /* Each bound VSocket is stored in the bind hash table and each connected |
| 143 | * VSocket is stored in the connected hash table. |
| 144 | * |
| 145 | * Unbound sockets are all put on the same list attached to the end of the hash |
| 146 | * table (vsock_unbound_sockets). Bound sockets are added to the hash table in |
| 147 | * the bucket that their local address hashes to (vsock_bound_sockets(addr) |
| 148 | * represents the list that addr hashes to). |
| 149 | * |
| 150 | * Specifically, we initialize the vsock_bind_table array to a size of |
| 151 | * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through |
| 152 | * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and |
| 153 | * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function |
Asias He | a49dd9d | 2013-06-20 17:20:33 +0800 | [diff] [blame] | 154 | * mods with VSOCK_HASH_SIZE to ensure this. |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 155 | */ |
| 156 | #define VSOCK_HASH_SIZE 251 |
| 157 | #define MAX_PORT_RETRIES 24 |
| 158 | |
Asias He | a49dd9d | 2013-06-20 17:20:33 +0800 | [diff] [blame] | 159 | #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 160 | #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) |
| 161 | #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) |
| 162 | |
| 163 | /* XXX This can probably be implemented in a better way. */ |
| 164 | #define VSOCK_CONN_HASH(src, dst) \ |
Asias He | a49dd9d | 2013-06-20 17:20:33 +0800 | [diff] [blame] | 165 | (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 166 | #define vsock_connected_sockets(src, dst) \ |
| 167 | (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) |
| 168 | #define vsock_connected_sockets_vsk(vsk) \ |
| 169 | vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) |
| 170 | |
| 171 | static struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; |
| 172 | static struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; |
| 173 | static DEFINE_SPINLOCK(vsock_table_lock); |
| 174 | |
Asias He | b3a6dfe | 2013-06-20 17:20:30 +0800 | [diff] [blame] | 175 | /* Autobind this socket to the local address if necessary. */ |
| 176 | static int vsock_auto_bind(struct vsock_sock *vsk) |
| 177 | { |
| 178 | struct sock *sk = sk_vsock(vsk); |
| 179 | struct sockaddr_vm local_addr; |
| 180 | |
| 181 | if (vsock_addr_bound(&vsk->local_addr)) |
| 182 | return 0; |
| 183 | vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); |
| 184 | return __vsock_bind(sk, &local_addr); |
| 185 | } |
| 186 | |
Geert Uytterhoeven | 22ee3b5 | 2013-04-23 23:40:55 +0000 | [diff] [blame] | 187 | static void vsock_init_tables(void) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 188 | { |
| 189 | int i; |
| 190 | |
| 191 | for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) |
| 192 | INIT_LIST_HEAD(&vsock_bind_table[i]); |
| 193 | |
| 194 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) |
| 195 | INIT_LIST_HEAD(&vsock_connected_table[i]); |
| 196 | } |
| 197 | |
| 198 | static void __vsock_insert_bound(struct list_head *list, |
| 199 | struct vsock_sock *vsk) |
| 200 | { |
| 201 | sock_hold(&vsk->sk); |
| 202 | list_add(&vsk->bound_table, list); |
| 203 | } |
| 204 | |
| 205 | static void __vsock_insert_connected(struct list_head *list, |
| 206 | struct vsock_sock *vsk) |
| 207 | { |
| 208 | sock_hold(&vsk->sk); |
| 209 | list_add(&vsk->connected_table, list); |
| 210 | } |
| 211 | |
| 212 | static void __vsock_remove_bound(struct vsock_sock *vsk) |
| 213 | { |
| 214 | list_del_init(&vsk->bound_table); |
| 215 | sock_put(&vsk->sk); |
| 216 | } |
| 217 | |
| 218 | static void __vsock_remove_connected(struct vsock_sock *vsk) |
| 219 | { |
| 220 | list_del_init(&vsk->connected_table); |
| 221 | sock_put(&vsk->sk); |
| 222 | } |
| 223 | |
| 224 | static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) |
| 225 | { |
| 226 | struct vsock_sock *vsk; |
| 227 | |
| 228 | list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) |
Reilly Grant | 990454b | 2013-04-01 11:41:52 -0700 | [diff] [blame] | 229 | if (addr->svm_port == vsk->local_addr.svm_port) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 230 | return sk_vsock(vsk); |
| 231 | |
| 232 | return NULL; |
| 233 | } |
| 234 | |
| 235 | static struct sock *__vsock_find_connected_socket(struct sockaddr_vm *src, |
| 236 | struct sockaddr_vm *dst) |
| 237 | { |
| 238 | struct vsock_sock *vsk; |
| 239 | |
| 240 | list_for_each_entry(vsk, vsock_connected_sockets(src, dst), |
| 241 | connected_table) { |
Reilly Grant | 990454b | 2013-04-01 11:41:52 -0700 | [diff] [blame] | 242 | if (vsock_addr_equals_addr(src, &vsk->remote_addr) && |
| 243 | dst->svm_port == vsk->local_addr.svm_port) { |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 244 | return sk_vsock(vsk); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | return NULL; |
| 249 | } |
| 250 | |
| 251 | static bool __vsock_in_bound_table(struct vsock_sock *vsk) |
| 252 | { |
| 253 | return !list_empty(&vsk->bound_table); |
| 254 | } |
| 255 | |
| 256 | static bool __vsock_in_connected_table(struct vsock_sock *vsk) |
| 257 | { |
| 258 | return !list_empty(&vsk->connected_table); |
| 259 | } |
| 260 | |
| 261 | static void vsock_insert_unbound(struct vsock_sock *vsk) |
| 262 | { |
| 263 | spin_lock_bh(&vsock_table_lock); |
| 264 | __vsock_insert_bound(vsock_unbound_sockets, vsk); |
| 265 | spin_unlock_bh(&vsock_table_lock); |
| 266 | } |
| 267 | |
| 268 | void vsock_insert_connected(struct vsock_sock *vsk) |
| 269 | { |
| 270 | struct list_head *list = vsock_connected_sockets( |
| 271 | &vsk->remote_addr, &vsk->local_addr); |
| 272 | |
| 273 | spin_lock_bh(&vsock_table_lock); |
| 274 | __vsock_insert_connected(list, vsk); |
| 275 | spin_unlock_bh(&vsock_table_lock); |
| 276 | } |
| 277 | EXPORT_SYMBOL_GPL(vsock_insert_connected); |
| 278 | |
| 279 | void vsock_remove_bound(struct vsock_sock *vsk) |
| 280 | { |
| 281 | spin_lock_bh(&vsock_table_lock); |
| 282 | __vsock_remove_bound(vsk); |
| 283 | spin_unlock_bh(&vsock_table_lock); |
| 284 | } |
| 285 | EXPORT_SYMBOL_GPL(vsock_remove_bound); |
| 286 | |
| 287 | void vsock_remove_connected(struct vsock_sock *vsk) |
| 288 | { |
| 289 | spin_lock_bh(&vsock_table_lock); |
| 290 | __vsock_remove_connected(vsk); |
| 291 | spin_unlock_bh(&vsock_table_lock); |
| 292 | } |
| 293 | EXPORT_SYMBOL_GPL(vsock_remove_connected); |
| 294 | |
| 295 | struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) |
| 296 | { |
| 297 | struct sock *sk; |
| 298 | |
| 299 | spin_lock_bh(&vsock_table_lock); |
| 300 | sk = __vsock_find_bound_socket(addr); |
| 301 | if (sk) |
| 302 | sock_hold(sk); |
| 303 | |
| 304 | spin_unlock_bh(&vsock_table_lock); |
| 305 | |
| 306 | return sk; |
| 307 | } |
| 308 | EXPORT_SYMBOL_GPL(vsock_find_bound_socket); |
| 309 | |
| 310 | struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, |
| 311 | struct sockaddr_vm *dst) |
| 312 | { |
| 313 | struct sock *sk; |
| 314 | |
| 315 | spin_lock_bh(&vsock_table_lock); |
| 316 | sk = __vsock_find_connected_socket(src, dst); |
| 317 | if (sk) |
| 318 | sock_hold(sk); |
| 319 | |
| 320 | spin_unlock_bh(&vsock_table_lock); |
| 321 | |
| 322 | return sk; |
| 323 | } |
| 324 | EXPORT_SYMBOL_GPL(vsock_find_connected_socket); |
| 325 | |
| 326 | static bool vsock_in_bound_table(struct vsock_sock *vsk) |
| 327 | { |
| 328 | bool ret; |
| 329 | |
| 330 | spin_lock_bh(&vsock_table_lock); |
| 331 | ret = __vsock_in_bound_table(vsk); |
| 332 | spin_unlock_bh(&vsock_table_lock); |
| 333 | |
| 334 | return ret; |
| 335 | } |
| 336 | |
| 337 | static bool vsock_in_connected_table(struct vsock_sock *vsk) |
| 338 | { |
| 339 | bool ret; |
| 340 | |
| 341 | spin_lock_bh(&vsock_table_lock); |
| 342 | ret = __vsock_in_connected_table(vsk); |
| 343 | spin_unlock_bh(&vsock_table_lock); |
| 344 | |
| 345 | return ret; |
| 346 | } |
| 347 | |
Stefan Hajnoczi | 6773b7d | 2016-07-28 15:36:31 +0100 | [diff] [blame] | 348 | void vsock_remove_sock(struct vsock_sock *vsk) |
| 349 | { |
| 350 | if (vsock_in_bound_table(vsk)) |
| 351 | vsock_remove_bound(vsk); |
| 352 | |
| 353 | if (vsock_in_connected_table(vsk)) |
| 354 | vsock_remove_connected(vsk); |
| 355 | } |
| 356 | EXPORT_SYMBOL_GPL(vsock_remove_sock); |
| 357 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 358 | void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) |
| 359 | { |
| 360 | int i; |
| 361 | |
| 362 | spin_lock_bh(&vsock_table_lock); |
| 363 | |
| 364 | for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { |
| 365 | struct vsock_sock *vsk; |
| 366 | list_for_each_entry(vsk, &vsock_connected_table[i], |
Julia Lawall | d9af2d6 | 2013-08-05 16:47:38 +0200 | [diff] [blame] | 367 | connected_table) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 368 | fn(sk_vsock(vsk)); |
| 369 | } |
| 370 | |
| 371 | spin_unlock_bh(&vsock_table_lock); |
| 372 | } |
| 373 | EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); |
| 374 | |
| 375 | void vsock_add_pending(struct sock *listener, struct sock *pending) |
| 376 | { |
| 377 | struct vsock_sock *vlistener; |
| 378 | struct vsock_sock *vpending; |
| 379 | |
| 380 | vlistener = vsock_sk(listener); |
| 381 | vpending = vsock_sk(pending); |
| 382 | |
| 383 | sock_hold(pending); |
| 384 | sock_hold(listener); |
| 385 | list_add_tail(&vpending->pending_links, &vlistener->pending_links); |
| 386 | } |
| 387 | EXPORT_SYMBOL_GPL(vsock_add_pending); |
| 388 | |
| 389 | void vsock_remove_pending(struct sock *listener, struct sock *pending) |
| 390 | { |
| 391 | struct vsock_sock *vpending = vsock_sk(pending); |
| 392 | |
| 393 | list_del_init(&vpending->pending_links); |
| 394 | sock_put(listener); |
| 395 | sock_put(pending); |
| 396 | } |
| 397 | EXPORT_SYMBOL_GPL(vsock_remove_pending); |
| 398 | |
| 399 | void vsock_enqueue_accept(struct sock *listener, struct sock *connected) |
| 400 | { |
| 401 | struct vsock_sock *vlistener; |
| 402 | struct vsock_sock *vconnected; |
| 403 | |
| 404 | vlistener = vsock_sk(listener); |
| 405 | vconnected = vsock_sk(connected); |
| 406 | |
| 407 | sock_hold(connected); |
| 408 | sock_hold(listener); |
| 409 | list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); |
| 410 | } |
| 411 | EXPORT_SYMBOL_GPL(vsock_enqueue_accept); |
| 412 | |
| 413 | static struct sock *vsock_dequeue_accept(struct sock *listener) |
| 414 | { |
| 415 | struct vsock_sock *vlistener; |
| 416 | struct vsock_sock *vconnected; |
| 417 | |
| 418 | vlistener = vsock_sk(listener); |
| 419 | |
| 420 | if (list_empty(&vlistener->accept_queue)) |
| 421 | return NULL; |
| 422 | |
| 423 | vconnected = list_entry(vlistener->accept_queue.next, |
| 424 | struct vsock_sock, accept_queue); |
| 425 | |
| 426 | list_del_init(&vconnected->accept_queue); |
| 427 | sock_put(listener); |
| 428 | /* The caller will need a reference on the connected socket so we let |
| 429 | * it call sock_put(). |
| 430 | */ |
| 431 | |
| 432 | return sk_vsock(vconnected); |
| 433 | } |
| 434 | |
| 435 | static bool vsock_is_accept_queue_empty(struct sock *sk) |
| 436 | { |
| 437 | struct vsock_sock *vsk = vsock_sk(sk); |
| 438 | return list_empty(&vsk->accept_queue); |
| 439 | } |
| 440 | |
| 441 | static bool vsock_is_pending(struct sock *sk) |
| 442 | { |
| 443 | struct vsock_sock *vsk = vsock_sk(sk); |
| 444 | return !list_empty(&vsk->pending_links); |
| 445 | } |
| 446 | |
| 447 | static int vsock_send_shutdown(struct sock *sk, int mode) |
| 448 | { |
| 449 | return transport->shutdown(vsock_sk(sk), mode); |
| 450 | } |
| 451 | |
| 452 | void vsock_pending_work(struct work_struct *work) |
| 453 | { |
| 454 | struct sock *sk; |
| 455 | struct sock *listener; |
| 456 | struct vsock_sock *vsk; |
| 457 | bool cleanup; |
| 458 | |
| 459 | vsk = container_of(work, struct vsock_sock, dwork.work); |
| 460 | sk = sk_vsock(vsk); |
| 461 | listener = vsk->listener; |
| 462 | cleanup = true; |
| 463 | |
| 464 | lock_sock(listener); |
Stefan Hajnoczi | 4192f67 | 2016-06-23 16:28:58 +0100 | [diff] [blame] | 465 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 466 | |
| 467 | if (vsock_is_pending(sk)) { |
| 468 | vsock_remove_pending(listener, sk); |
Jorgen Hansen | 1190cfd | 2016-09-26 23:59:53 -0700 | [diff] [blame] | 469 | |
| 470 | listener->sk_ack_backlog--; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 471 | } else if (!vsk->rejected) { |
| 472 | /* We are not on the pending list and accept() did not reject |
| 473 | * us, so we must have been accepted by our user process. We |
| 474 | * just need to drop our references to the sockets and be on |
| 475 | * our way. |
| 476 | */ |
| 477 | cleanup = false; |
| 478 | goto out; |
| 479 | } |
| 480 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 481 | /* We need to remove ourself from the global connected sockets list so |
| 482 | * incoming packets can't find this socket, and to reduce the reference |
| 483 | * count. |
| 484 | */ |
| 485 | if (vsock_in_connected_table(vsk)) |
| 486 | vsock_remove_connected(vsk); |
| 487 | |
| 488 | sk->sk_state = SS_FREE; |
| 489 | |
| 490 | out: |
| 491 | release_sock(sk); |
| 492 | release_sock(listener); |
| 493 | if (cleanup) |
| 494 | sock_put(sk); |
| 495 | |
| 496 | sock_put(sk); |
| 497 | sock_put(listener); |
| 498 | } |
| 499 | EXPORT_SYMBOL_GPL(vsock_pending_work); |
| 500 | |
| 501 | /**** SOCKET OPERATIONS ****/ |
| 502 | |
| 503 | static int __vsock_bind_stream(struct vsock_sock *vsk, |
| 504 | struct sockaddr_vm *addr) |
| 505 | { |
| 506 | static u32 port = LAST_RESERVED_PORT + 1; |
| 507 | struct sockaddr_vm new_addr; |
| 508 | |
| 509 | vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); |
| 510 | |
| 511 | if (addr->svm_port == VMADDR_PORT_ANY) { |
| 512 | bool found = false; |
| 513 | unsigned int i; |
| 514 | |
| 515 | for (i = 0; i < MAX_PORT_RETRIES; i++) { |
| 516 | if (port <= LAST_RESERVED_PORT) |
| 517 | port = LAST_RESERVED_PORT + 1; |
| 518 | |
| 519 | new_addr.svm_port = port++; |
| 520 | |
| 521 | if (!__vsock_find_bound_socket(&new_addr)) { |
| 522 | found = true; |
| 523 | break; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | if (!found) |
| 528 | return -EADDRNOTAVAIL; |
| 529 | } else { |
| 530 | /* If port is in reserved range, ensure caller |
| 531 | * has necessary privileges. |
| 532 | */ |
| 533 | if (addr->svm_port <= LAST_RESERVED_PORT && |
| 534 | !capable(CAP_NET_BIND_SERVICE)) { |
| 535 | return -EACCES; |
| 536 | } |
| 537 | |
| 538 | if (__vsock_find_bound_socket(&new_addr)) |
| 539 | return -EADDRINUSE; |
| 540 | } |
| 541 | |
| 542 | vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); |
| 543 | |
| 544 | /* Remove stream sockets from the unbound list and add them to the hash |
| 545 | * table for easy lookup by its address. The unbound list is simply an |
| 546 | * extra entry at the end of the hash table, a trick used by AF_UNIX. |
| 547 | */ |
| 548 | __vsock_remove_bound(vsk); |
| 549 | __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); |
| 550 | |
| 551 | return 0; |
| 552 | } |
| 553 | |
| 554 | static int __vsock_bind_dgram(struct vsock_sock *vsk, |
| 555 | struct sockaddr_vm *addr) |
| 556 | { |
| 557 | return transport->dgram_bind(vsk, addr); |
| 558 | } |
| 559 | |
| 560 | static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) |
| 561 | { |
| 562 | struct vsock_sock *vsk = vsock_sk(sk); |
| 563 | u32 cid; |
| 564 | int retval; |
| 565 | |
| 566 | /* First ensure this socket isn't already bound. */ |
| 567 | if (vsock_addr_bound(&vsk->local_addr)) |
| 568 | return -EINVAL; |
| 569 | |
| 570 | /* Now bind to the provided address or select appropriate values if |
| 571 | * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that |
| 572 | * like AF_INET prevents binding to a non-local IP address (in most |
| 573 | * cases), we only allow binding to the local CID. |
| 574 | */ |
| 575 | cid = transport->get_local_cid(); |
| 576 | if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) |
| 577 | return -EADDRNOTAVAIL; |
| 578 | |
| 579 | switch (sk->sk_socket->type) { |
| 580 | case SOCK_STREAM: |
| 581 | spin_lock_bh(&vsock_table_lock); |
| 582 | retval = __vsock_bind_stream(vsk, addr); |
| 583 | spin_unlock_bh(&vsock_table_lock); |
| 584 | break; |
| 585 | |
| 586 | case SOCK_DGRAM: |
| 587 | retval = __vsock_bind_dgram(vsk, addr); |
| 588 | break; |
| 589 | |
| 590 | default: |
| 591 | retval = -EINVAL; |
| 592 | break; |
| 593 | } |
| 594 | |
| 595 | return retval; |
| 596 | } |
| 597 | |
| 598 | struct sock *__vsock_create(struct net *net, |
| 599 | struct socket *sock, |
| 600 | struct sock *parent, |
| 601 | gfp_t priority, |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 602 | unsigned short type, |
| 603 | int kern) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 604 | { |
| 605 | struct sock *sk; |
| 606 | struct vsock_sock *psk; |
| 607 | struct vsock_sock *vsk; |
| 608 | |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 609 | sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 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; |
| 628 | sk->sk_state = 0; |
| 629 | sock_reset_flag(sk, SOCK_DONE); |
| 630 | |
| 631 | INIT_LIST_HEAD(&vsk->bound_table); |
| 632 | INIT_LIST_HEAD(&vsk->connected_table); |
| 633 | vsk->listener = NULL; |
| 634 | INIT_LIST_HEAD(&vsk->pending_links); |
| 635 | INIT_LIST_HEAD(&vsk->accept_queue); |
| 636 | vsk->rejected = false; |
| 637 | vsk->sent_request = false; |
| 638 | vsk->ignore_connecting_rst = false; |
| 639 | vsk->peer_shutdown = 0; |
| 640 | |
| 641 | psk = parent ? vsock_sk(parent) : NULL; |
| 642 | if (parent) { |
| 643 | vsk->trusted = psk->trusted; |
| 644 | vsk->owner = get_cred(psk->owner); |
| 645 | vsk->connect_timeout = psk->connect_timeout; |
| 646 | } else { |
| 647 | vsk->trusted = capable(CAP_NET_ADMIN); |
| 648 | vsk->owner = get_current_cred(); |
| 649 | vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; |
| 650 | } |
| 651 | |
| 652 | if (transport->init(vsk, psk) < 0) { |
| 653 | sk_free(sk); |
| 654 | return NULL; |
| 655 | } |
| 656 | |
| 657 | if (sock) |
| 658 | vsock_insert_unbound(vsk); |
| 659 | |
| 660 | return sk; |
| 661 | } |
| 662 | EXPORT_SYMBOL_GPL(__vsock_create); |
| 663 | |
| 664 | static void __vsock_release(struct sock *sk) |
| 665 | { |
| 666 | if (sk) { |
| 667 | struct sk_buff *skb; |
| 668 | struct sock *pending; |
| 669 | struct vsock_sock *vsk; |
| 670 | |
| 671 | vsk = vsock_sk(sk); |
| 672 | pending = NULL; /* Compiler warning. */ |
| 673 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 674 | transport->release(vsk); |
| 675 | |
| 676 | lock_sock(sk); |
| 677 | sock_orphan(sk); |
| 678 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 679 | |
| 680 | while ((skb = skb_dequeue(&sk->sk_receive_queue))) |
| 681 | kfree_skb(skb); |
| 682 | |
| 683 | /* Clean up any sockets that never were accepted. */ |
| 684 | while ((pending = vsock_dequeue_accept(sk)) != NULL) { |
| 685 | __vsock_release(pending); |
| 686 | sock_put(pending); |
| 687 | } |
| 688 | |
| 689 | release_sock(sk); |
| 690 | sock_put(sk); |
| 691 | } |
| 692 | } |
| 693 | |
| 694 | static void vsock_sk_destruct(struct sock *sk) |
| 695 | { |
| 696 | struct vsock_sock *vsk = vsock_sk(sk); |
| 697 | |
| 698 | transport->destruct(vsk); |
| 699 | |
| 700 | /* When clearing these addresses, there's no need to set the family and |
| 701 | * possibly register the address family with the kernel. |
| 702 | */ |
| 703 | vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); |
| 704 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); |
| 705 | |
| 706 | put_cred(vsk->owner); |
| 707 | } |
| 708 | |
| 709 | static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 710 | { |
| 711 | int err; |
| 712 | |
| 713 | err = sock_queue_rcv_skb(sk, skb); |
| 714 | if (err) |
| 715 | kfree_skb(skb); |
| 716 | |
| 717 | return err; |
| 718 | } |
| 719 | |
| 720 | s64 vsock_stream_has_data(struct vsock_sock *vsk) |
| 721 | { |
| 722 | return transport->stream_has_data(vsk); |
| 723 | } |
| 724 | EXPORT_SYMBOL_GPL(vsock_stream_has_data); |
| 725 | |
| 726 | s64 vsock_stream_has_space(struct vsock_sock *vsk) |
| 727 | { |
| 728 | return transport->stream_has_space(vsk); |
| 729 | } |
| 730 | EXPORT_SYMBOL_GPL(vsock_stream_has_space); |
| 731 | |
| 732 | static int vsock_release(struct socket *sock) |
| 733 | { |
| 734 | __vsock_release(sock->sk); |
| 735 | sock->sk = NULL; |
| 736 | sock->state = SS_FREE; |
| 737 | |
| 738 | return 0; |
| 739 | } |
| 740 | |
| 741 | static int |
| 742 | vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
| 743 | { |
| 744 | int err; |
| 745 | struct sock *sk; |
| 746 | struct sockaddr_vm *vm_addr; |
| 747 | |
| 748 | sk = sock->sk; |
| 749 | |
| 750 | if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) |
| 751 | return -EINVAL; |
| 752 | |
| 753 | lock_sock(sk); |
| 754 | err = __vsock_bind(sk, vm_addr); |
| 755 | release_sock(sk); |
| 756 | |
| 757 | return err; |
| 758 | } |
| 759 | |
| 760 | static int vsock_getname(struct socket *sock, |
| 761 | struct sockaddr *addr, int *addr_len, int peer) |
| 762 | { |
| 763 | int err; |
| 764 | struct sock *sk; |
| 765 | struct vsock_sock *vsk; |
| 766 | struct sockaddr_vm *vm_addr; |
| 767 | |
| 768 | sk = sock->sk; |
| 769 | vsk = vsock_sk(sk); |
| 770 | err = 0; |
| 771 | |
| 772 | lock_sock(sk); |
| 773 | |
| 774 | if (peer) { |
| 775 | if (sock->state != SS_CONNECTED) { |
| 776 | err = -ENOTCONN; |
| 777 | goto out; |
| 778 | } |
| 779 | vm_addr = &vsk->remote_addr; |
| 780 | } else { |
| 781 | vm_addr = &vsk->local_addr; |
| 782 | } |
| 783 | |
| 784 | if (!vm_addr) { |
| 785 | err = -EINVAL; |
| 786 | goto out; |
| 787 | } |
| 788 | |
| 789 | /* sys_getsockname() and sys_getpeername() pass us a |
| 790 | * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately |
| 791 | * that macro is defined in socket.c instead of .h, so we hardcode its |
| 792 | * value here. |
| 793 | */ |
| 794 | BUILD_BUG_ON(sizeof(*vm_addr) > 128); |
| 795 | memcpy(addr, vm_addr, sizeof(*vm_addr)); |
| 796 | *addr_len = sizeof(*vm_addr); |
| 797 | |
| 798 | out: |
| 799 | release_sock(sk); |
| 800 | return err; |
| 801 | } |
| 802 | |
| 803 | static int vsock_shutdown(struct socket *sock, int mode) |
| 804 | { |
| 805 | int err; |
| 806 | struct sock *sk; |
| 807 | |
| 808 | /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses |
| 809 | * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode |
| 810 | * here like the other address families do. Note also that the |
| 811 | * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), |
| 812 | * which is what we want. |
| 813 | */ |
| 814 | mode++; |
| 815 | |
| 816 | if ((mode & ~SHUTDOWN_MASK) || !mode) |
| 817 | return -EINVAL; |
| 818 | |
| 819 | /* If this is a STREAM socket and it is not connected then bail out |
| 820 | * immediately. If it is a DGRAM socket then we must first kick the |
| 821 | * socket so that it wakes up from any sleeping calls, for example |
| 822 | * recv(), and then afterwards return the error. |
| 823 | */ |
| 824 | |
| 825 | sk = sock->sk; |
| 826 | if (sock->state == SS_UNCONNECTED) { |
| 827 | err = -ENOTCONN; |
| 828 | if (sk->sk_type == SOCK_STREAM) |
| 829 | return err; |
| 830 | } else { |
| 831 | sock->state = SS_DISCONNECTING; |
| 832 | err = 0; |
| 833 | } |
| 834 | |
| 835 | /* Receive and send shutdowns are treated alike. */ |
| 836 | mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); |
| 837 | if (mode) { |
| 838 | lock_sock(sk); |
| 839 | sk->sk_shutdown |= mode; |
| 840 | sk->sk_state_change(sk); |
| 841 | release_sock(sk); |
| 842 | |
| 843 | if (sk->sk_type == SOCK_STREAM) { |
| 844 | sock_reset_flag(sk, SOCK_DONE); |
| 845 | vsock_send_shutdown(sk, mode); |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | return err; |
| 850 | } |
| 851 | |
| 852 | static unsigned int vsock_poll(struct file *file, struct socket *sock, |
| 853 | poll_table *wait) |
| 854 | { |
| 855 | struct sock *sk; |
| 856 | unsigned int mask; |
| 857 | struct vsock_sock *vsk; |
| 858 | |
| 859 | sk = sock->sk; |
| 860 | vsk = vsock_sk(sk); |
| 861 | |
| 862 | poll_wait(file, sk_sleep(sk), wait); |
| 863 | mask = 0; |
| 864 | |
| 865 | if (sk->sk_err) |
| 866 | /* Signify that there has been an error on this socket. */ |
| 867 | mask |= POLLERR; |
| 868 | |
| 869 | /* INET sockets treat local write shutdown and peer write shutdown as a |
| 870 | * case of POLLHUP set. |
| 871 | */ |
| 872 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || |
| 873 | ((sk->sk_shutdown & SEND_SHUTDOWN) && |
| 874 | (vsk->peer_shutdown & SEND_SHUTDOWN))) { |
| 875 | mask |= POLLHUP; |
| 876 | } |
| 877 | |
| 878 | if (sk->sk_shutdown & RCV_SHUTDOWN || |
| 879 | vsk->peer_shutdown & SEND_SHUTDOWN) { |
| 880 | mask |= POLLRDHUP; |
| 881 | } |
| 882 | |
| 883 | if (sock->type == SOCK_DGRAM) { |
| 884 | /* For datagram sockets we can read if there is something in |
| 885 | * the queue and write as long as the socket isn't shutdown for |
| 886 | * sending. |
| 887 | */ |
| 888 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
| 889 | (sk->sk_shutdown & RCV_SHUTDOWN)) { |
| 890 | mask |= POLLIN | POLLRDNORM; |
| 891 | } |
| 892 | |
| 893 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) |
| 894 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
| 895 | |
| 896 | } else if (sock->type == SOCK_STREAM) { |
| 897 | lock_sock(sk); |
| 898 | |
| 899 | /* Listening sockets that have connections in their accept |
| 900 | * queue can be read. |
| 901 | */ |
Stefan Hajnoczi | ea3803c | 2015-10-29 11:57:42 +0000 | [diff] [blame] | 902 | if (sk->sk_state == VSOCK_SS_LISTEN |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 903 | && !vsock_is_accept_queue_empty(sk)) |
| 904 | mask |= POLLIN | POLLRDNORM; |
| 905 | |
| 906 | /* If there is something in the queue then we can read. */ |
| 907 | if (transport->stream_is_active(vsk) && |
| 908 | !(sk->sk_shutdown & RCV_SHUTDOWN)) { |
| 909 | bool data_ready_now = false; |
| 910 | int ret = transport->notify_poll_in( |
| 911 | vsk, 1, &data_ready_now); |
| 912 | if (ret < 0) { |
| 913 | mask |= POLLERR; |
| 914 | } else { |
| 915 | if (data_ready_now) |
| 916 | mask |= POLLIN | POLLRDNORM; |
| 917 | |
| 918 | } |
| 919 | } |
| 920 | |
| 921 | /* Sockets whose connections have been closed, reset, or |
| 922 | * terminated should also be considered read, and we check the |
| 923 | * shutdown flag for that. |
| 924 | */ |
| 925 | if (sk->sk_shutdown & RCV_SHUTDOWN || |
| 926 | vsk->peer_shutdown & SEND_SHUTDOWN) { |
| 927 | mask |= POLLIN | POLLRDNORM; |
| 928 | } |
| 929 | |
| 930 | /* Connected sockets that can produce data can be written. */ |
| 931 | if (sk->sk_state == SS_CONNECTED) { |
| 932 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 933 | bool space_avail_now = false; |
| 934 | int ret = transport->notify_poll_out( |
| 935 | vsk, 1, &space_avail_now); |
| 936 | if (ret < 0) { |
| 937 | mask |= POLLERR; |
| 938 | } else { |
| 939 | if (space_avail_now) |
| 940 | /* Remove POLLWRBAND since INET |
| 941 | * sockets are not setting it. |
| 942 | */ |
| 943 | mask |= POLLOUT | POLLWRNORM; |
| 944 | |
| 945 | } |
| 946 | } |
| 947 | } |
| 948 | |
| 949 | /* Simulate INET socket poll behaviors, which sets |
| 950 | * POLLOUT|POLLWRNORM when peer is closed and nothing to read, |
| 951 | * but local send is not shutdown. |
| 952 | */ |
| 953 | if (sk->sk_state == SS_UNCONNECTED) { |
| 954 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) |
| 955 | mask |= POLLOUT | POLLWRNORM; |
| 956 | |
| 957 | } |
| 958 | |
| 959 | release_sock(sk); |
| 960 | } |
| 961 | |
| 962 | return mask; |
| 963 | } |
| 964 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 965 | static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, |
| 966 | size_t len) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 967 | { |
| 968 | int err; |
| 969 | struct sock *sk; |
| 970 | struct vsock_sock *vsk; |
| 971 | struct sockaddr_vm *remote_addr; |
| 972 | |
| 973 | if (msg->msg_flags & MSG_OOB) |
| 974 | return -EOPNOTSUPP; |
| 975 | |
| 976 | /* For now, MSG_DONTWAIT is always assumed... */ |
| 977 | err = 0; |
| 978 | sk = sock->sk; |
| 979 | vsk = vsock_sk(sk); |
| 980 | |
| 981 | lock_sock(sk); |
| 982 | |
Asias He | b3a6dfe | 2013-06-20 17:20:30 +0800 | [diff] [blame] | 983 | err = vsock_auto_bind(vsk); |
| 984 | if (err) |
| 985 | goto out; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 986 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 987 | |
| 988 | /* If the provided message contains an address, use that. Otherwise |
| 989 | * fall back on the socket's remote handle (if it has been connected). |
| 990 | */ |
| 991 | if (msg->msg_name && |
| 992 | vsock_addr_cast(msg->msg_name, msg->msg_namelen, |
| 993 | &remote_addr) == 0) { |
| 994 | /* Ensure this address is of the right type and is a valid |
| 995 | * destination. |
| 996 | */ |
| 997 | |
| 998 | if (remote_addr->svm_cid == VMADDR_CID_ANY) |
| 999 | remote_addr->svm_cid = transport->get_local_cid(); |
| 1000 | |
| 1001 | if (!vsock_addr_bound(remote_addr)) { |
| 1002 | err = -EINVAL; |
| 1003 | goto out; |
| 1004 | } |
| 1005 | } else if (sock->state == SS_CONNECTED) { |
| 1006 | remote_addr = &vsk->remote_addr; |
| 1007 | |
| 1008 | if (remote_addr->svm_cid == VMADDR_CID_ANY) |
| 1009 | remote_addr->svm_cid = transport->get_local_cid(); |
| 1010 | |
| 1011 | /* XXX Should connect() or this function ensure remote_addr is |
| 1012 | * bound? |
| 1013 | */ |
| 1014 | if (!vsock_addr_bound(&vsk->remote_addr)) { |
| 1015 | err = -EINVAL; |
| 1016 | goto out; |
| 1017 | } |
| 1018 | } else { |
| 1019 | err = -EINVAL; |
| 1020 | goto out; |
| 1021 | } |
| 1022 | |
| 1023 | if (!transport->dgram_allow(remote_addr->svm_cid, |
| 1024 | remote_addr->svm_port)) { |
| 1025 | err = -EINVAL; |
| 1026 | goto out; |
| 1027 | } |
| 1028 | |
Al Viro | 0f7db23 | 2014-11-20 04:05:34 -0500 | [diff] [blame] | 1029 | err = transport->dgram_enqueue(vsk, remote_addr, msg, len); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1030 | |
| 1031 | out: |
| 1032 | release_sock(sk); |
| 1033 | return err; |
| 1034 | } |
| 1035 | |
| 1036 | static int vsock_dgram_connect(struct socket *sock, |
| 1037 | struct sockaddr *addr, int addr_len, int flags) |
| 1038 | { |
| 1039 | int err; |
| 1040 | struct sock *sk; |
| 1041 | struct vsock_sock *vsk; |
| 1042 | struct sockaddr_vm *remote_addr; |
| 1043 | |
| 1044 | sk = sock->sk; |
| 1045 | vsk = vsock_sk(sk); |
| 1046 | |
| 1047 | err = vsock_addr_cast(addr, addr_len, &remote_addr); |
| 1048 | if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { |
| 1049 | lock_sock(sk); |
| 1050 | vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, |
| 1051 | VMADDR_PORT_ANY); |
| 1052 | sock->state = SS_UNCONNECTED; |
| 1053 | release_sock(sk); |
| 1054 | return 0; |
| 1055 | } else if (err != 0) |
| 1056 | return -EINVAL; |
| 1057 | |
| 1058 | lock_sock(sk); |
| 1059 | |
Asias He | b3a6dfe | 2013-06-20 17:20:30 +0800 | [diff] [blame] | 1060 | err = vsock_auto_bind(vsk); |
| 1061 | if (err) |
| 1062 | goto out; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1063 | |
| 1064 | if (!transport->dgram_allow(remote_addr->svm_cid, |
| 1065 | remote_addr->svm_port)) { |
| 1066 | err = -EINVAL; |
| 1067 | goto out; |
| 1068 | } |
| 1069 | |
| 1070 | memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); |
| 1071 | sock->state = SS_CONNECTED; |
| 1072 | |
| 1073 | out: |
| 1074 | release_sock(sk); |
| 1075 | return err; |
| 1076 | } |
| 1077 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1078 | static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, |
| 1079 | size_t len, int flags) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1080 | { |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1081 | return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1082 | } |
| 1083 | |
| 1084 | static const struct proto_ops vsock_dgram_ops = { |
| 1085 | .family = PF_VSOCK, |
| 1086 | .owner = THIS_MODULE, |
| 1087 | .release = vsock_release, |
| 1088 | .bind = vsock_bind, |
| 1089 | .connect = vsock_dgram_connect, |
| 1090 | .socketpair = sock_no_socketpair, |
| 1091 | .accept = sock_no_accept, |
| 1092 | .getname = vsock_getname, |
| 1093 | .poll = vsock_poll, |
| 1094 | .ioctl = sock_no_ioctl, |
| 1095 | .listen = sock_no_listen, |
| 1096 | .shutdown = vsock_shutdown, |
| 1097 | .setsockopt = sock_no_setsockopt, |
| 1098 | .getsockopt = sock_no_getsockopt, |
| 1099 | .sendmsg = vsock_dgram_sendmsg, |
| 1100 | .recvmsg = vsock_dgram_recvmsg, |
| 1101 | .mmap = sock_no_mmap, |
| 1102 | .sendpage = sock_no_sendpage, |
| 1103 | }; |
| 1104 | |
Peng Tao | 380feae | 2017-03-15 09:32:17 +0800 | [diff] [blame] | 1105 | static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) |
| 1106 | { |
| 1107 | if (!transport->cancel_pkt) |
| 1108 | return -EOPNOTSUPP; |
| 1109 | |
| 1110 | return transport->cancel_pkt(vsk); |
| 1111 | } |
| 1112 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1113 | static void vsock_connect_timeout(struct work_struct *work) |
| 1114 | { |
| 1115 | struct sock *sk; |
| 1116 | struct vsock_sock *vsk; |
Peng Tao | 380feae | 2017-03-15 09:32:17 +0800 | [diff] [blame] | 1117 | int cancel = 0; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1118 | |
| 1119 | vsk = container_of(work, struct vsock_sock, dwork.work); |
| 1120 | sk = sk_vsock(vsk); |
| 1121 | |
| 1122 | lock_sock(sk); |
| 1123 | if (sk->sk_state == SS_CONNECTING && |
| 1124 | (sk->sk_shutdown != SHUTDOWN_MASK)) { |
| 1125 | sk->sk_state = SS_UNCONNECTED; |
| 1126 | sk->sk_err = ETIMEDOUT; |
| 1127 | sk->sk_error_report(sk); |
Peng Tao | 380feae | 2017-03-15 09:32:17 +0800 | [diff] [blame] | 1128 | cancel = 1; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1129 | } |
| 1130 | release_sock(sk); |
Peng Tao | 380feae | 2017-03-15 09:32:17 +0800 | [diff] [blame] | 1131 | if (cancel) |
| 1132 | vsock_transport_cancel_pkt(vsk); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1133 | |
| 1134 | sock_put(sk); |
| 1135 | } |
| 1136 | |
| 1137 | static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, |
| 1138 | int addr_len, int flags) |
| 1139 | { |
| 1140 | int err; |
| 1141 | struct sock *sk; |
| 1142 | struct vsock_sock *vsk; |
| 1143 | struct sockaddr_vm *remote_addr; |
| 1144 | long timeout; |
| 1145 | DEFINE_WAIT(wait); |
| 1146 | |
| 1147 | err = 0; |
| 1148 | sk = sock->sk; |
| 1149 | vsk = vsock_sk(sk); |
| 1150 | |
| 1151 | lock_sock(sk); |
| 1152 | |
| 1153 | /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ |
| 1154 | switch (sock->state) { |
| 1155 | case SS_CONNECTED: |
| 1156 | err = -EISCONN; |
| 1157 | goto out; |
| 1158 | case SS_DISCONNECTING: |
| 1159 | err = -EINVAL; |
| 1160 | goto out; |
| 1161 | case SS_CONNECTING: |
| 1162 | /* This continues on so we can move sock into the SS_CONNECTED |
| 1163 | * state once the connection has completed (at which point err |
| 1164 | * will be set to zero also). Otherwise, we will either wait |
| 1165 | * for the connection or return -EALREADY should this be a |
| 1166 | * non-blocking call. |
| 1167 | */ |
| 1168 | err = -EALREADY; |
| 1169 | break; |
| 1170 | default: |
Stefan Hajnoczi | ea3803c | 2015-10-29 11:57:42 +0000 | [diff] [blame] | 1171 | if ((sk->sk_state == VSOCK_SS_LISTEN) || |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1172 | vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { |
| 1173 | err = -EINVAL; |
| 1174 | goto out; |
| 1175 | } |
| 1176 | |
| 1177 | /* The hypervisor and well-known contexts do not have socket |
| 1178 | * endpoints. |
| 1179 | */ |
| 1180 | if (!transport->stream_allow(remote_addr->svm_cid, |
| 1181 | remote_addr->svm_port)) { |
| 1182 | err = -ENETUNREACH; |
| 1183 | goto out; |
| 1184 | } |
| 1185 | |
| 1186 | /* Set the remote address that we are connecting to. */ |
| 1187 | memcpy(&vsk->remote_addr, remote_addr, |
| 1188 | sizeof(vsk->remote_addr)); |
| 1189 | |
Asias He | b3a6dfe | 2013-06-20 17:20:30 +0800 | [diff] [blame] | 1190 | err = vsock_auto_bind(vsk); |
| 1191 | if (err) |
| 1192 | goto out; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1193 | |
| 1194 | sk->sk_state = SS_CONNECTING; |
| 1195 | |
| 1196 | err = transport->connect(vsk); |
| 1197 | if (err < 0) |
| 1198 | goto out; |
| 1199 | |
| 1200 | /* Mark sock as connecting and set the error code to in |
| 1201 | * progress in case this is a non-blocking connect. |
| 1202 | */ |
| 1203 | sock->state = SS_CONNECTING; |
| 1204 | err = -EINPROGRESS; |
| 1205 | } |
| 1206 | |
| 1207 | /* The receive path will handle all communication until we are able to |
| 1208 | * enter the connected state. Here we wait for the connection to be |
| 1209 | * completed or a notification of an error. |
| 1210 | */ |
| 1211 | timeout = vsk->connect_timeout; |
| 1212 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| 1213 | |
| 1214 | while (sk->sk_state != SS_CONNECTED && sk->sk_err == 0) { |
| 1215 | if (flags & O_NONBLOCK) { |
| 1216 | /* If we're not going to block, we schedule a timeout |
| 1217 | * function to generate a timeout on the connection |
| 1218 | * attempt, in case the peer doesn't respond in a |
| 1219 | * timely manner. We hold on to the socket until the |
| 1220 | * timeout fires. |
| 1221 | */ |
| 1222 | sock_hold(sk); |
| 1223 | INIT_DELAYED_WORK(&vsk->dwork, |
| 1224 | vsock_connect_timeout); |
| 1225 | schedule_delayed_work(&vsk->dwork, timeout); |
| 1226 | |
| 1227 | /* Skip ahead to preserve error code set above. */ |
| 1228 | goto out_wait; |
| 1229 | } |
| 1230 | |
| 1231 | release_sock(sk); |
| 1232 | timeout = schedule_timeout(timeout); |
| 1233 | lock_sock(sk); |
| 1234 | |
| 1235 | if (signal_pending(current)) { |
| 1236 | err = sock_intr_errno(timeout); |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1237 | sk->sk_state = SS_UNCONNECTED; |
| 1238 | sock->state = SS_UNCONNECTED; |
Peng Tao | 380feae | 2017-03-15 09:32:17 +0800 | [diff] [blame] | 1239 | vsock_transport_cancel_pkt(vsk); |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1240 | goto out_wait; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1241 | } else if (timeout == 0) { |
| 1242 | err = -ETIMEDOUT; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1243 | sk->sk_state = SS_UNCONNECTED; |
| 1244 | sock->state = SS_UNCONNECTED; |
Peng Tao | 380feae | 2017-03-15 09:32:17 +0800 | [diff] [blame] | 1245 | vsock_transport_cancel_pkt(vsk); |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1246 | goto out_wait; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1247 | } |
| 1248 | |
| 1249 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| 1250 | } |
| 1251 | |
| 1252 | if (sk->sk_err) { |
| 1253 | err = -sk->sk_err; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1254 | sk->sk_state = SS_UNCONNECTED; |
| 1255 | sock->state = SS_UNCONNECTED; |
| 1256 | } else { |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1257 | err = 0; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1258 | } |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1259 | |
| 1260 | out_wait: |
| 1261 | finish_wait(sk_sleep(sk), &wait); |
| 1262 | out: |
| 1263 | release_sock(sk); |
| 1264 | return err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1265 | } |
| 1266 | |
David Howells | cdfbabf | 2017-03-09 08:09:05 +0000 | [diff] [blame] | 1267 | static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, |
| 1268 | bool kern) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1269 | { |
| 1270 | struct sock *listener; |
| 1271 | int err; |
| 1272 | struct sock *connected; |
| 1273 | struct vsock_sock *vconnected; |
| 1274 | long timeout; |
| 1275 | DEFINE_WAIT(wait); |
| 1276 | |
| 1277 | err = 0; |
| 1278 | listener = sock->sk; |
| 1279 | |
| 1280 | lock_sock(listener); |
| 1281 | |
| 1282 | if (sock->type != SOCK_STREAM) { |
| 1283 | err = -EOPNOTSUPP; |
| 1284 | goto out; |
| 1285 | } |
| 1286 | |
Stefan Hajnoczi | ea3803c | 2015-10-29 11:57:42 +0000 | [diff] [blame] | 1287 | if (listener->sk_state != VSOCK_SS_LISTEN) { |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1288 | err = -EINVAL; |
| 1289 | goto out; |
| 1290 | } |
| 1291 | |
| 1292 | /* Wait for children sockets to appear; these are the new sockets |
| 1293 | * created upon connection establishment. |
| 1294 | */ |
| 1295 | timeout = sock_sndtimeo(listener, flags & O_NONBLOCK); |
| 1296 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); |
| 1297 | |
| 1298 | while ((connected = vsock_dequeue_accept(listener)) == NULL && |
| 1299 | listener->sk_err == 0) { |
| 1300 | release_sock(listener); |
| 1301 | timeout = schedule_timeout(timeout); |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1302 | finish_wait(sk_sleep(listener), &wait); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1303 | lock_sock(listener); |
| 1304 | |
| 1305 | if (signal_pending(current)) { |
| 1306 | err = sock_intr_errno(timeout); |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1307 | goto out; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1308 | } else if (timeout == 0) { |
| 1309 | err = -EAGAIN; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1310 | goto out; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1311 | } |
| 1312 | |
| 1313 | prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); |
| 1314 | } |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1315 | finish_wait(sk_sleep(listener), &wait); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1316 | |
| 1317 | if (listener->sk_err) |
| 1318 | err = -listener->sk_err; |
| 1319 | |
| 1320 | if (connected) { |
| 1321 | listener->sk_ack_backlog--; |
| 1322 | |
Stefan Hajnoczi | 4192f67 | 2016-06-23 16:28:58 +0100 | [diff] [blame] | 1323 | lock_sock_nested(connected, SINGLE_DEPTH_NESTING); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1324 | vconnected = vsock_sk(connected); |
| 1325 | |
| 1326 | /* If the listener socket has received an error, then we should |
| 1327 | * reject this socket and return. Note that we simply mark the |
| 1328 | * socket rejected, drop our reference, and let the cleanup |
| 1329 | * function handle the cleanup; the fact that we found it in |
| 1330 | * the listener's accept queue guarantees that the cleanup |
| 1331 | * function hasn't run yet. |
| 1332 | */ |
| 1333 | if (err) { |
| 1334 | vconnected->rejected = true; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1335 | } else { |
| 1336 | newsock->state = SS_CONNECTED; |
| 1337 | sock_graft(connected, newsock); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1338 | } |
| 1339 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1340 | release_sock(connected); |
| 1341 | sock_put(connected); |
| 1342 | } |
| 1343 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1344 | out: |
| 1345 | release_sock(listener); |
| 1346 | return err; |
| 1347 | } |
| 1348 | |
| 1349 | static int vsock_listen(struct socket *sock, int backlog) |
| 1350 | { |
| 1351 | int err; |
| 1352 | struct sock *sk; |
| 1353 | struct vsock_sock *vsk; |
| 1354 | |
| 1355 | sk = sock->sk; |
| 1356 | |
| 1357 | lock_sock(sk); |
| 1358 | |
| 1359 | if (sock->type != SOCK_STREAM) { |
| 1360 | err = -EOPNOTSUPP; |
| 1361 | goto out; |
| 1362 | } |
| 1363 | |
| 1364 | if (sock->state != SS_UNCONNECTED) { |
| 1365 | err = -EINVAL; |
| 1366 | goto out; |
| 1367 | } |
| 1368 | |
| 1369 | vsk = vsock_sk(sk); |
| 1370 | |
| 1371 | if (!vsock_addr_bound(&vsk->local_addr)) { |
| 1372 | err = -EINVAL; |
| 1373 | goto out; |
| 1374 | } |
| 1375 | |
| 1376 | sk->sk_max_ack_backlog = backlog; |
Stefan Hajnoczi | ea3803c | 2015-10-29 11:57:42 +0000 | [diff] [blame] | 1377 | sk->sk_state = VSOCK_SS_LISTEN; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1378 | |
| 1379 | err = 0; |
| 1380 | |
| 1381 | out: |
| 1382 | release_sock(sk); |
| 1383 | return err; |
| 1384 | } |
| 1385 | |
| 1386 | static int vsock_stream_setsockopt(struct socket *sock, |
| 1387 | int level, |
| 1388 | int optname, |
| 1389 | char __user *optval, |
| 1390 | unsigned int optlen) |
| 1391 | { |
| 1392 | int err; |
| 1393 | struct sock *sk; |
| 1394 | struct vsock_sock *vsk; |
| 1395 | u64 val; |
| 1396 | |
| 1397 | if (level != AF_VSOCK) |
| 1398 | return -ENOPROTOOPT; |
| 1399 | |
| 1400 | #define COPY_IN(_v) \ |
| 1401 | do { \ |
| 1402 | if (optlen < sizeof(_v)) { \ |
| 1403 | err = -EINVAL; \ |
| 1404 | goto exit; \ |
| 1405 | } \ |
| 1406 | if (copy_from_user(&_v, optval, sizeof(_v)) != 0) { \ |
| 1407 | err = -EFAULT; \ |
| 1408 | goto exit; \ |
| 1409 | } \ |
| 1410 | } while (0) |
| 1411 | |
| 1412 | err = 0; |
| 1413 | sk = sock->sk; |
| 1414 | vsk = vsock_sk(sk); |
| 1415 | |
| 1416 | lock_sock(sk); |
| 1417 | |
| 1418 | switch (optname) { |
| 1419 | case SO_VM_SOCKETS_BUFFER_SIZE: |
| 1420 | COPY_IN(val); |
| 1421 | transport->set_buffer_size(vsk, val); |
| 1422 | break; |
| 1423 | |
| 1424 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: |
| 1425 | COPY_IN(val); |
| 1426 | transport->set_max_buffer_size(vsk, val); |
| 1427 | break; |
| 1428 | |
| 1429 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: |
| 1430 | COPY_IN(val); |
| 1431 | transport->set_min_buffer_size(vsk, val); |
| 1432 | break; |
| 1433 | |
| 1434 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { |
| 1435 | struct timeval tv; |
| 1436 | COPY_IN(tv); |
| 1437 | if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && |
| 1438 | tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { |
| 1439 | vsk->connect_timeout = tv.tv_sec * HZ + |
| 1440 | DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); |
| 1441 | if (vsk->connect_timeout == 0) |
| 1442 | vsk->connect_timeout = |
| 1443 | VSOCK_DEFAULT_CONNECT_TIMEOUT; |
| 1444 | |
| 1445 | } else { |
| 1446 | err = -ERANGE; |
| 1447 | } |
| 1448 | break; |
| 1449 | } |
| 1450 | |
| 1451 | default: |
| 1452 | err = -ENOPROTOOPT; |
| 1453 | break; |
| 1454 | } |
| 1455 | |
| 1456 | #undef COPY_IN |
| 1457 | |
| 1458 | exit: |
| 1459 | release_sock(sk); |
| 1460 | return err; |
| 1461 | } |
| 1462 | |
| 1463 | static int vsock_stream_getsockopt(struct socket *sock, |
| 1464 | int level, int optname, |
| 1465 | char __user *optval, |
| 1466 | int __user *optlen) |
| 1467 | { |
| 1468 | int err; |
| 1469 | int len; |
| 1470 | struct sock *sk; |
| 1471 | struct vsock_sock *vsk; |
| 1472 | u64 val; |
| 1473 | |
| 1474 | if (level != AF_VSOCK) |
| 1475 | return -ENOPROTOOPT; |
| 1476 | |
| 1477 | err = get_user(len, optlen); |
| 1478 | if (err != 0) |
| 1479 | return err; |
| 1480 | |
| 1481 | #define COPY_OUT(_v) \ |
| 1482 | do { \ |
| 1483 | if (len < sizeof(_v)) \ |
| 1484 | return -EINVAL; \ |
| 1485 | \ |
| 1486 | len = sizeof(_v); \ |
| 1487 | if (copy_to_user(optval, &_v, len) != 0) \ |
| 1488 | return -EFAULT; \ |
| 1489 | \ |
| 1490 | } while (0) |
| 1491 | |
| 1492 | err = 0; |
| 1493 | sk = sock->sk; |
| 1494 | vsk = vsock_sk(sk); |
| 1495 | |
| 1496 | switch (optname) { |
| 1497 | case SO_VM_SOCKETS_BUFFER_SIZE: |
| 1498 | val = transport->get_buffer_size(vsk); |
| 1499 | COPY_OUT(val); |
| 1500 | break; |
| 1501 | |
| 1502 | case SO_VM_SOCKETS_BUFFER_MAX_SIZE: |
| 1503 | val = transport->get_max_buffer_size(vsk); |
| 1504 | COPY_OUT(val); |
| 1505 | break; |
| 1506 | |
| 1507 | case SO_VM_SOCKETS_BUFFER_MIN_SIZE: |
| 1508 | val = transport->get_min_buffer_size(vsk); |
| 1509 | COPY_OUT(val); |
| 1510 | break; |
| 1511 | |
| 1512 | case SO_VM_SOCKETS_CONNECT_TIMEOUT: { |
| 1513 | struct timeval tv; |
| 1514 | tv.tv_sec = vsk->connect_timeout / HZ; |
| 1515 | tv.tv_usec = |
| 1516 | (vsk->connect_timeout - |
| 1517 | tv.tv_sec * HZ) * (1000000 / HZ); |
| 1518 | COPY_OUT(tv); |
| 1519 | break; |
| 1520 | } |
| 1521 | default: |
| 1522 | return -ENOPROTOOPT; |
| 1523 | } |
| 1524 | |
| 1525 | err = put_user(len, optlen); |
| 1526 | if (err != 0) |
| 1527 | return -EFAULT; |
| 1528 | |
| 1529 | #undef COPY_OUT |
| 1530 | |
| 1531 | return 0; |
| 1532 | } |
| 1533 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1534 | static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, |
| 1535 | size_t len) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1536 | { |
| 1537 | struct sock *sk; |
| 1538 | struct vsock_sock *vsk; |
| 1539 | ssize_t total_written; |
| 1540 | long timeout; |
| 1541 | int err; |
| 1542 | struct vsock_transport_send_notify_data send_data; |
| 1543 | |
| 1544 | DEFINE_WAIT(wait); |
| 1545 | |
| 1546 | sk = sock->sk; |
| 1547 | vsk = vsock_sk(sk); |
| 1548 | total_written = 0; |
| 1549 | err = 0; |
| 1550 | |
| 1551 | if (msg->msg_flags & MSG_OOB) |
| 1552 | return -EOPNOTSUPP; |
| 1553 | |
| 1554 | lock_sock(sk); |
| 1555 | |
| 1556 | /* Callers should not provide a destination with stream sockets. */ |
| 1557 | if (msg->msg_namelen) { |
| 1558 | err = sk->sk_state == SS_CONNECTED ? -EISCONN : -EOPNOTSUPP; |
| 1559 | goto out; |
| 1560 | } |
| 1561 | |
| 1562 | /* Send data only if both sides are not shutdown in the direction. */ |
| 1563 | if (sk->sk_shutdown & SEND_SHUTDOWN || |
| 1564 | vsk->peer_shutdown & RCV_SHUTDOWN) { |
| 1565 | err = -EPIPE; |
| 1566 | goto out; |
| 1567 | } |
| 1568 | |
| 1569 | if (sk->sk_state != SS_CONNECTED || |
| 1570 | !vsock_addr_bound(&vsk->local_addr)) { |
| 1571 | err = -ENOTCONN; |
| 1572 | goto out; |
| 1573 | } |
| 1574 | |
| 1575 | if (!vsock_addr_bound(&vsk->remote_addr)) { |
| 1576 | err = -EDESTADDRREQ; |
| 1577 | goto out; |
| 1578 | } |
| 1579 | |
| 1580 | /* Wait for room in the produce queue to enqueue our user's data. */ |
| 1581 | timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
| 1582 | |
| 1583 | err = transport->notify_send_init(vsk, &send_data); |
| 1584 | if (err < 0) |
| 1585 | goto out; |
| 1586 | |
Claudio Imbrenda | 6f57e56 | 2016-03-22 17:05:51 +0100 | [diff] [blame] | 1587 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1588 | while (total_written < len) { |
| 1589 | ssize_t written; |
| 1590 | |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1591 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1592 | while (vsock_stream_has_space(vsk) == 0 && |
| 1593 | sk->sk_err == 0 && |
| 1594 | !(sk->sk_shutdown & SEND_SHUTDOWN) && |
| 1595 | !(vsk->peer_shutdown & RCV_SHUTDOWN)) { |
| 1596 | |
| 1597 | /* Don't wait for non-blocking sockets. */ |
| 1598 | if (timeout == 0) { |
| 1599 | err = -EAGAIN; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1600 | finish_wait(sk_sleep(sk), &wait); |
| 1601 | goto out_err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1602 | } |
| 1603 | |
| 1604 | err = transport->notify_send_pre_block(vsk, &send_data); |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1605 | if (err < 0) { |
| 1606 | finish_wait(sk_sleep(sk), &wait); |
| 1607 | goto out_err; |
| 1608 | } |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1609 | |
| 1610 | release_sock(sk); |
| 1611 | timeout = schedule_timeout(timeout); |
| 1612 | lock_sock(sk); |
| 1613 | if (signal_pending(current)) { |
| 1614 | err = sock_intr_errno(timeout); |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1615 | finish_wait(sk_sleep(sk), &wait); |
| 1616 | goto out_err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1617 | } else if (timeout == 0) { |
| 1618 | err = -EAGAIN; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1619 | finish_wait(sk_sleep(sk), &wait); |
| 1620 | goto out_err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1621 | } |
| 1622 | |
Claudio Imbrenda | 6f57e56 | 2016-03-22 17:05:51 +0100 | [diff] [blame] | 1623 | prepare_to_wait(sk_sleep(sk), &wait, |
| 1624 | TASK_INTERRUPTIBLE); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1625 | } |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1626 | finish_wait(sk_sleep(sk), &wait); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1627 | |
| 1628 | /* These checks occur both as part of and after the loop |
| 1629 | * conditional since we need to check before and after |
| 1630 | * sleeping. |
| 1631 | */ |
| 1632 | if (sk->sk_err) { |
| 1633 | err = -sk->sk_err; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1634 | goto out_err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1635 | } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || |
| 1636 | (vsk->peer_shutdown & RCV_SHUTDOWN)) { |
| 1637 | err = -EPIPE; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1638 | goto out_err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1639 | } |
| 1640 | |
| 1641 | err = transport->notify_send_pre_enqueue(vsk, &send_data); |
| 1642 | if (err < 0) |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1643 | goto out_err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1644 | |
| 1645 | /* Note that enqueue will only write as many bytes as are free |
| 1646 | * in the produce queue, so we don't need to ensure len is |
| 1647 | * smaller than the queue size. It is the caller's |
| 1648 | * responsibility to check how many bytes we were able to send. |
| 1649 | */ |
| 1650 | |
| 1651 | written = transport->stream_enqueue( |
Al Viro | 0f7db23 | 2014-11-20 04:05:34 -0500 | [diff] [blame] | 1652 | vsk, msg, |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1653 | len - total_written); |
| 1654 | if (written < 0) { |
| 1655 | err = -ENOMEM; |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1656 | goto out_err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1657 | } |
| 1658 | |
| 1659 | total_written += written; |
| 1660 | |
| 1661 | err = transport->notify_send_post_enqueue( |
| 1662 | vsk, written, &send_data); |
| 1663 | if (err < 0) |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1664 | goto out_err; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1665 | |
| 1666 | } |
| 1667 | |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1668 | out_err: |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1669 | if (total_written > 0) |
| 1670 | err = total_written; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1671 | out: |
| 1672 | release_sock(sk); |
| 1673 | return err; |
| 1674 | } |
| 1675 | |
| 1676 | |
| 1677 | static int |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1678 | vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
| 1679 | int flags) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1680 | { |
| 1681 | struct sock *sk; |
| 1682 | struct vsock_sock *vsk; |
| 1683 | int err; |
| 1684 | size_t target; |
| 1685 | ssize_t copied; |
| 1686 | long timeout; |
| 1687 | struct vsock_transport_recv_notify_data recv_data; |
| 1688 | |
| 1689 | DEFINE_WAIT(wait); |
| 1690 | |
| 1691 | sk = sock->sk; |
| 1692 | vsk = vsock_sk(sk); |
| 1693 | err = 0; |
| 1694 | |
| 1695 | lock_sock(sk); |
| 1696 | |
| 1697 | if (sk->sk_state != SS_CONNECTED) { |
| 1698 | /* Recvmsg is supposed to return 0 if a peer performs an |
| 1699 | * orderly shutdown. Differentiate between that case and when a |
| 1700 | * peer has not connected or a local shutdown occured with the |
| 1701 | * SOCK_DONE flag. |
| 1702 | */ |
| 1703 | if (sock_flag(sk, SOCK_DONE)) |
| 1704 | err = 0; |
| 1705 | else |
| 1706 | err = -ENOTCONN; |
| 1707 | |
| 1708 | goto out; |
| 1709 | } |
| 1710 | |
| 1711 | if (flags & MSG_OOB) { |
| 1712 | err = -EOPNOTSUPP; |
| 1713 | goto out; |
| 1714 | } |
| 1715 | |
| 1716 | /* We don't check peer_shutdown flag here since peer may actually shut |
| 1717 | * down, but there can be data in the queue that a local socket can |
| 1718 | * receive. |
| 1719 | */ |
| 1720 | if (sk->sk_shutdown & RCV_SHUTDOWN) { |
| 1721 | err = 0; |
| 1722 | goto out; |
| 1723 | } |
| 1724 | |
| 1725 | /* It is valid on Linux to pass in a zero-length receive buffer. This |
| 1726 | * is not an error. We may as well bail out now. |
| 1727 | */ |
| 1728 | if (!len) { |
| 1729 | err = 0; |
| 1730 | goto out; |
| 1731 | } |
| 1732 | |
| 1733 | /* We must not copy less than target bytes into the user's buffer |
| 1734 | * before returning successfully, so we wait for the consume queue to |
| 1735 | * have that much data to consume before dequeueing. Note that this |
| 1736 | * makes it impossible to handle cases where target is greater than the |
| 1737 | * queue size. |
| 1738 | */ |
| 1739 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); |
| 1740 | if (target >= transport->stream_rcvhiwat(vsk)) { |
| 1741 | err = -ENOMEM; |
| 1742 | goto out; |
| 1743 | } |
| 1744 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
| 1745 | copied = 0; |
| 1746 | |
| 1747 | err = transport->notify_recv_init(vsk, target, &recv_data); |
| 1748 | if (err < 0) |
| 1749 | goto out; |
| 1750 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1751 | |
| 1752 | while (1) { |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1753 | s64 ready; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1754 | |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1755 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| 1756 | ready = vsock_stream_has_data(vsk); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1757 | |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1758 | if (ready == 0) { |
| 1759 | if (sk->sk_err != 0 || |
| 1760 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 1761 | (vsk->peer_shutdown & SEND_SHUTDOWN)) { |
| 1762 | finish_wait(sk_sleep(sk), &wait); |
| 1763 | break; |
| 1764 | } |
| 1765 | /* Don't wait for non-blocking sockets. */ |
| 1766 | if (timeout == 0) { |
| 1767 | err = -EAGAIN; |
| 1768 | finish_wait(sk_sleep(sk), &wait); |
| 1769 | break; |
| 1770 | } |
| 1771 | |
| 1772 | err = transport->notify_recv_pre_block( |
| 1773 | vsk, target, &recv_data); |
| 1774 | if (err < 0) { |
| 1775 | finish_wait(sk_sleep(sk), &wait); |
| 1776 | break; |
| 1777 | } |
| 1778 | release_sock(sk); |
| 1779 | timeout = schedule_timeout(timeout); |
| 1780 | lock_sock(sk); |
| 1781 | |
| 1782 | if (signal_pending(current)) { |
| 1783 | err = sock_intr_errno(timeout); |
| 1784 | finish_wait(sk_sleep(sk), &wait); |
| 1785 | break; |
| 1786 | } else if (timeout == 0) { |
| 1787 | err = -EAGAIN; |
| 1788 | finish_wait(sk_sleep(sk), &wait); |
| 1789 | break; |
| 1790 | } |
| 1791 | } else { |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1792 | ssize_t read; |
| 1793 | |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1794 | finish_wait(sk_sleep(sk), &wait); |
| 1795 | |
| 1796 | if (ready < 0) { |
| 1797 | /* Invalid queue pair content. XXX This should |
| 1798 | * be changed to a connection reset in a later |
| 1799 | * change. |
| 1800 | */ |
| 1801 | |
| 1802 | err = -ENOMEM; |
| 1803 | goto out; |
| 1804 | } |
| 1805 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1806 | err = transport->notify_recv_pre_dequeue( |
| 1807 | vsk, target, &recv_data); |
| 1808 | if (err < 0) |
| 1809 | break; |
| 1810 | |
| 1811 | read = transport->stream_dequeue( |
Al Viro | 0f7db23 | 2014-11-20 04:05:34 -0500 | [diff] [blame] | 1812 | vsk, msg, |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1813 | len - copied, flags); |
| 1814 | if (read < 0) { |
| 1815 | err = -ENOMEM; |
| 1816 | break; |
| 1817 | } |
| 1818 | |
| 1819 | copied += read; |
| 1820 | |
| 1821 | err = transport->notify_recv_post_dequeue( |
| 1822 | vsk, target, read, |
| 1823 | !(flags & MSG_PEEK), &recv_data); |
| 1824 | if (err < 0) |
Claudio Imbrenda | f7f9b5e | 2016-03-22 17:05:52 +0100 | [diff] [blame] | 1825 | goto out; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1826 | |
| 1827 | if (read >= target || flags & MSG_PEEK) |
| 1828 | break; |
| 1829 | |
| 1830 | target -= read; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1831 | } |
| 1832 | } |
| 1833 | |
| 1834 | if (sk->sk_err) |
| 1835 | err = -sk->sk_err; |
| 1836 | else if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 1837 | err = 0; |
| 1838 | |
Ian Campbell | dedc58e | 2016-05-04 14:21:53 +0100 | [diff] [blame] | 1839 | if (copied > 0) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1840 | err = copied; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1841 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1842 | out: |
| 1843 | release_sock(sk); |
| 1844 | return err; |
| 1845 | } |
| 1846 | |
| 1847 | static const struct proto_ops vsock_stream_ops = { |
| 1848 | .family = PF_VSOCK, |
| 1849 | .owner = THIS_MODULE, |
| 1850 | .release = vsock_release, |
| 1851 | .bind = vsock_bind, |
| 1852 | .connect = vsock_stream_connect, |
| 1853 | .socketpair = sock_no_socketpair, |
| 1854 | .accept = vsock_accept, |
| 1855 | .getname = vsock_getname, |
| 1856 | .poll = vsock_poll, |
| 1857 | .ioctl = sock_no_ioctl, |
| 1858 | .listen = vsock_listen, |
| 1859 | .shutdown = vsock_shutdown, |
| 1860 | .setsockopt = vsock_stream_setsockopt, |
| 1861 | .getsockopt = vsock_stream_getsockopt, |
| 1862 | .sendmsg = vsock_stream_sendmsg, |
| 1863 | .recvmsg = vsock_stream_recvmsg, |
| 1864 | .mmap = sock_no_mmap, |
| 1865 | .sendpage = sock_no_sendpage, |
| 1866 | }; |
| 1867 | |
| 1868 | static int vsock_create(struct net *net, struct socket *sock, |
| 1869 | int protocol, int kern) |
| 1870 | { |
| 1871 | if (!sock) |
| 1872 | return -EINVAL; |
| 1873 | |
Andy King | 6cf1c5f | 2013-02-18 06:04:13 +0000 | [diff] [blame] | 1874 | if (protocol && protocol != PF_VSOCK) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1875 | return -EPROTONOSUPPORT; |
| 1876 | |
| 1877 | switch (sock->type) { |
| 1878 | case SOCK_DGRAM: |
| 1879 | sock->ops = &vsock_dgram_ops; |
| 1880 | break; |
| 1881 | case SOCK_STREAM: |
| 1882 | sock->ops = &vsock_stream_ops; |
| 1883 | break; |
| 1884 | default: |
| 1885 | return -ESOCKTNOSUPPORT; |
| 1886 | } |
| 1887 | |
| 1888 | sock->state = SS_UNCONNECTED; |
| 1889 | |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 1890 | return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1891 | } |
| 1892 | |
| 1893 | static const struct net_proto_family vsock_family_ops = { |
| 1894 | .family = AF_VSOCK, |
| 1895 | .create = vsock_create, |
| 1896 | .owner = THIS_MODULE, |
| 1897 | }; |
| 1898 | |
| 1899 | static long vsock_dev_do_ioctl(struct file *filp, |
| 1900 | unsigned int cmd, void __user *ptr) |
| 1901 | { |
| 1902 | u32 __user *p = ptr; |
| 1903 | int retval = 0; |
| 1904 | |
| 1905 | switch (cmd) { |
| 1906 | case IOCTL_VM_SOCKETS_GET_LOCAL_CID: |
| 1907 | if (put_user(transport->get_local_cid(), p) != 0) |
| 1908 | retval = -EFAULT; |
| 1909 | break; |
| 1910 | |
| 1911 | default: |
| 1912 | pr_err("Unknown ioctl %d\n", cmd); |
| 1913 | retval = -EINVAL; |
| 1914 | } |
| 1915 | |
| 1916 | return retval; |
| 1917 | } |
| 1918 | |
| 1919 | static long vsock_dev_ioctl(struct file *filp, |
| 1920 | unsigned int cmd, unsigned long arg) |
| 1921 | { |
| 1922 | return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); |
| 1923 | } |
| 1924 | |
| 1925 | #ifdef CONFIG_COMPAT |
| 1926 | static long vsock_dev_compat_ioctl(struct file *filp, |
| 1927 | unsigned int cmd, unsigned long arg) |
| 1928 | { |
| 1929 | return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); |
| 1930 | } |
| 1931 | #endif |
| 1932 | |
| 1933 | static const struct file_operations vsock_device_ops = { |
| 1934 | .owner = THIS_MODULE, |
| 1935 | .unlocked_ioctl = vsock_dev_ioctl, |
| 1936 | #ifdef CONFIG_COMPAT |
| 1937 | .compat_ioctl = vsock_dev_compat_ioctl, |
| 1938 | #endif |
| 1939 | .open = nonseekable_open, |
| 1940 | }; |
| 1941 | |
| 1942 | static struct miscdevice vsock_device = { |
| 1943 | .name = "vsock", |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1944 | .fops = &vsock_device_ops, |
| 1945 | }; |
| 1946 | |
Andy King | 2c4a336 | 2014-05-01 15:20:43 -0700 | [diff] [blame] | 1947 | int __vsock_core_init(const struct vsock_transport *t, struct module *owner) |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1948 | { |
Andy King | 2c4a336 | 2014-05-01 15:20:43 -0700 | [diff] [blame] | 1949 | int err = mutex_lock_interruptible(&vsock_register_mutex); |
| 1950 | |
| 1951 | if (err) |
| 1952 | return err; |
| 1953 | |
| 1954 | if (transport) { |
| 1955 | err = -EBUSY; |
| 1956 | goto err_busy; |
| 1957 | } |
| 1958 | |
| 1959 | /* Transport must be the owner of the protocol so that it can't |
| 1960 | * unload while there are open sockets. |
| 1961 | */ |
| 1962 | vsock_proto.owner = owner; |
| 1963 | transport = t; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1964 | |
| 1965 | vsock_init_tables(); |
| 1966 | |
Asias He | 6ad0b2f | 2013-04-23 20:33:52 +0000 | [diff] [blame] | 1967 | vsock_device.minor = MISC_DYNAMIC_MINOR; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1968 | err = misc_register(&vsock_device); |
| 1969 | if (err) { |
| 1970 | pr_err("Failed to register misc device\n"); |
Gao feng | f6a835b | 2015-10-18 23:35:56 +0800 | [diff] [blame] | 1971 | goto err_reset_transport; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1972 | } |
| 1973 | |
| 1974 | err = proto_register(&vsock_proto, 1); /* we want our slab */ |
| 1975 | if (err) { |
| 1976 | pr_err("Cannot register vsock protocol\n"); |
Gao feng | f6a835b | 2015-10-18 23:35:56 +0800 | [diff] [blame] | 1977 | goto err_deregister_misc; |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1978 | } |
| 1979 | |
| 1980 | err = sock_register(&vsock_family_ops); |
| 1981 | if (err) { |
| 1982 | pr_err("could not register af_vsock (%d) address family: %d\n", |
| 1983 | AF_VSOCK, err); |
| 1984 | goto err_unregister_proto; |
| 1985 | } |
| 1986 | |
Andy King | 2c4a336 | 2014-05-01 15:20:43 -0700 | [diff] [blame] | 1987 | mutex_unlock(&vsock_register_mutex); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1988 | return 0; |
| 1989 | |
| 1990 | err_unregister_proto: |
| 1991 | proto_unregister(&vsock_proto); |
Gao feng | f6a835b | 2015-10-18 23:35:56 +0800 | [diff] [blame] | 1992 | err_deregister_misc: |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1993 | misc_deregister(&vsock_device); |
Gao feng | f6a835b | 2015-10-18 23:35:56 +0800 | [diff] [blame] | 1994 | err_reset_transport: |
Andy King | 2c4a336 | 2014-05-01 15:20:43 -0700 | [diff] [blame] | 1995 | transport = NULL; |
| 1996 | err_busy: |
| 1997 | mutex_unlock(&vsock_register_mutex); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 1998 | return err; |
| 1999 | } |
Andy King | 2c4a336 | 2014-05-01 15:20:43 -0700 | [diff] [blame] | 2000 | EXPORT_SYMBOL_GPL(__vsock_core_init); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 2001 | |
| 2002 | void vsock_core_exit(void) |
| 2003 | { |
| 2004 | mutex_lock(&vsock_register_mutex); |
| 2005 | |
| 2006 | misc_deregister(&vsock_device); |
| 2007 | sock_unregister(AF_VSOCK); |
| 2008 | proto_unregister(&vsock_proto); |
| 2009 | |
| 2010 | /* We do not want the assignment below re-ordered. */ |
| 2011 | mb(); |
| 2012 | transport = NULL; |
| 2013 | |
| 2014 | mutex_unlock(&vsock_register_mutex); |
| 2015 | } |
| 2016 | EXPORT_SYMBOL_GPL(vsock_core_exit); |
| 2017 | |
Stefan Hajnoczi | 0b01aeb | 2016-07-28 15:36:30 +0100 | [diff] [blame] | 2018 | const struct vsock_transport *vsock_core_get_transport(void) |
| 2019 | { |
| 2020 | /* vsock_register_mutex not taken since only the transport uses this |
| 2021 | * function and only while registered. |
| 2022 | */ |
| 2023 | return transport; |
| 2024 | } |
| 2025 | EXPORT_SYMBOL_GPL(vsock_core_get_transport); |
| 2026 | |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 2027 | MODULE_AUTHOR("VMware, Inc."); |
| 2028 | MODULE_DESCRIPTION("VMware Virtual Socket Family"); |
Jorgen Hansen | 1190cfd | 2016-09-26 23:59:53 -0700 | [diff] [blame] | 2029 | MODULE_VERSION("1.0.2.0-k"); |
Andy King | d021c34 | 2013-02-06 14:23:56 +0000 | [diff] [blame] | 2030 | MODULE_LICENSE("GPL v2"); |