1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * VMware vSockets Driver 4 * 5 * Copyright (C) 2007-2013 VMware, Inc. All rights reserved. 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 31 * implementation because they are in the TCP_LISTEN state. When a 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. 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 * 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 * 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. 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 86 */ 87 88 #include <linux/types.h> 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> 94 #include <linux/sched/signal.h> 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> 102 #include <linux/random.h> 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> 111 #include <net/af_vsock.h> 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) 128 129 #define VSOCK_DEFAULT_BUFFER_SIZE (1024 * 256) 130 #define VSOCK_DEFAULT_BUFFER_MAX_SIZE (1024 * 256) 131 #define VSOCK_DEFAULT_BUFFER_MIN_SIZE 128 132 133 /* 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; 139 /* Transport used for local communication */ 140 static const struct vsock_transport *transport_local; 141 static DEFINE_MUTEX(vsock_register_mutex); 142 143 /**** 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 157 * mods with VSOCK_HASH_SIZE to ensure this. 158 */ 159 #define MAX_PORT_RETRIES 24 160 161 #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) 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) \ 167 (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) 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) 172 173 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); 179 180 /* 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 } 191 192 static void vsock_init_tables(void) 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; 232 233 list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) { 234 if (vsock_addr_equals_addr(addr, &vsk->local_addr)) 235 return sk_vsock(vsk); 236 237 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 } 242 243 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) { 253 if (vsock_addr_equals_addr(src, &vsk->remote_addr) && 254 dst->svm_port == vsk->local_addr.svm_port) { 255 return sk_vsock(vsk); 256 } 257 } 258 259 return NULL; 260 } 261 262 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); 283 if (__vsock_in_bound_table(vsk)) 284 __vsock_remove_bound(vsk); 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); 292 if (__vsock_in_connected_table(vsk)) 293 __vsock_remove_connected(vsk); 294 spin_unlock_bh(&vsock_table_lock); 295 } 296 EXPORT_SYMBOL_GPL(vsock_remove_connected); 297 298 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) 299 { 300 struct sock *sk; 301 302 spin_lock_bh(&vsock_table_lock); 303 sk = __vsock_find_bound_socket(addr); 304 if (sk) 305 sock_hold(sk); 306 307 spin_unlock_bh(&vsock_table_lock); 308 309 return sk; 310 } 311 EXPORT_SYMBOL_GPL(vsock_find_bound_socket); 312 313 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, 314 struct sockaddr_vm *dst) 315 { 316 struct sock *sk; 317 318 spin_lock_bh(&vsock_table_lock); 319 sk = __vsock_find_connected_socket(src, dst); 320 if (sk) 321 sock_hold(sk); 322 323 spin_unlock_bh(&vsock_table_lock); 324 325 return sk; 326 } 327 EXPORT_SYMBOL_GPL(vsock_find_connected_socket); 328 329 void vsock_remove_sock(struct vsock_sock *vsk) 330 { 331 vsock_remove_bound(vsk); 332 vsock_remove_connected(vsk); 333 } 334 EXPORT_SYMBOL_GPL(vsock_remove_sock); 335 336 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], 345 connected_table) 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); 390 391 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 } 405 406 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 } 415 416 /* 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: 422 * - remote CID == VMADDR_CID_LOCAL or g2h->local_cid or VMADDR_CID_HOST if 423 * g2h is not loaded, will use local transport; 424 * - remote CID <= VMADDR_CID_HOST or h2g is not loaded or remote flags field 425 * includes VMADDR_FLAG_TO_HOST flag value, will use guest->host transport; 426 * - remote CID > VMADDR_CID_HOST will use host->guest transport; 427 */ 428 int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk) 429 { 430 const struct vsock_transport *new_transport; 431 struct sock *sk = sk_vsock(vsk); 432 unsigned int remote_cid = vsk->remote_addr.svm_cid; 433 __u8 remote_flags; 434 int ret; 435 436 /* If the packet is coming with the source and destination CIDs higher 437 * than VMADDR_CID_HOST, then a vsock channel where all the packets are 438 * forwarded to the host should be established. Then the host will 439 * need to forward the packets to the guest. 440 * 441 * The flag is set on the (listen) receive path (psk is not NULL). On 442 * the connect path the flag can be set by the user space application. 443 */ 444 if (psk && vsk->local_addr.svm_cid > VMADDR_CID_HOST && 445 vsk->remote_addr.svm_cid > VMADDR_CID_HOST) 446 vsk->remote_addr.svm_flags |= VMADDR_FLAG_TO_HOST; 447 448 remote_flags = vsk->remote_addr.svm_flags; 449 450 switch (sk->sk_type) { 451 case SOCK_DGRAM: 452 new_transport = transport_dgram; 453 break; 454 case SOCK_STREAM: 455 if (vsock_use_local_transport(remote_cid)) 456 new_transport = transport_local; 457 else if (remote_cid <= VMADDR_CID_HOST || !transport_h2g || 458 (remote_flags & VMADDR_FLAG_TO_HOST)) 459 new_transport = transport_g2h; 460 else 461 new_transport = transport_h2g; 462 break; 463 default: 464 return -ESOCKTNOSUPPORT; 465 } 466 467 if (vsk->transport) { 468 if (vsk->transport == new_transport) 469 return 0; 470 471 /* transport->release() must be called with sock lock acquired. 472 * This path can only be taken during vsock_stream_connect(), 473 * where we have already held the sock lock. 474 * In the other cases, this function is called on a new socket 475 * which is not assigned to any transport. 476 */ 477 vsk->transport->release(vsk); 478 vsock_deassign_transport(vsk); 479 } 480 481 /* We increase the module refcnt to prevent the transport unloading 482 * while there are open sockets assigned to it. 483 */ 484 if (!new_transport || !try_module_get(new_transport->module)) 485 return -ENODEV; 486 487 ret = new_transport->init(vsk, psk); 488 if (ret) { 489 module_put(new_transport->module); 490 return ret; 491 } 492 493 vsk->transport = new_transport; 494 495 return 0; 496 } 497 EXPORT_SYMBOL_GPL(vsock_assign_transport); 498 499 bool vsock_find_cid(unsigned int cid) 500 { 501 if (transport_g2h && cid == transport_g2h->get_local_cid()) 502 return true; 503 504 if (transport_h2g && cid == VMADDR_CID_HOST) 505 return true; 506 507 if (transport_local && cid == VMADDR_CID_LOCAL) 508 return true; 509 510 return false; 511 } 512 EXPORT_SYMBOL_GPL(vsock_find_cid); 513 514 static struct sock *vsock_dequeue_accept(struct sock *listener) 515 { 516 struct vsock_sock *vlistener; 517 struct vsock_sock *vconnected; 518 519 vlistener = vsock_sk(listener); 520 521 if (list_empty(&vlistener->accept_queue)) 522 return NULL; 523 524 vconnected = list_entry(vlistener->accept_queue.next, 525 struct vsock_sock, accept_queue); 526 527 list_del_init(&vconnected->accept_queue); 528 sock_put(listener); 529 /* The caller will need a reference on the connected socket so we let 530 * it call sock_put(). 531 */ 532 533 return sk_vsock(vconnected); 534 } 535 536 static bool vsock_is_accept_queue_empty(struct sock *sk) 537 { 538 struct vsock_sock *vsk = vsock_sk(sk); 539 return list_empty(&vsk->accept_queue); 540 } 541 542 static bool vsock_is_pending(struct sock *sk) 543 { 544 struct vsock_sock *vsk = vsock_sk(sk); 545 return !list_empty(&vsk->pending_links); 546 } 547 548 static int vsock_send_shutdown(struct sock *sk, int mode) 549 { 550 struct vsock_sock *vsk = vsock_sk(sk); 551 552 if (!vsk->transport) 553 return -ENODEV; 554 555 return vsk->transport->shutdown(vsk, mode); 556 } 557 558 static void vsock_pending_work(struct work_struct *work) 559 { 560 struct sock *sk; 561 struct sock *listener; 562 struct vsock_sock *vsk; 563 bool cleanup; 564 565 vsk = container_of(work, struct vsock_sock, pending_work.work); 566 sk = sk_vsock(vsk); 567 listener = vsk->listener; 568 cleanup = true; 569 570 lock_sock(listener); 571 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 572 573 if (vsock_is_pending(sk)) { 574 vsock_remove_pending(listener, sk); 575 576 sk_acceptq_removed(listener); 577 } else if (!vsk->rejected) { 578 /* We are not on the pending list and accept() did not reject 579 * us, so we must have been accepted by our user process. We 580 * just need to drop our references to the sockets and be on 581 * our way. 582 */ 583 cleanup = false; 584 goto out; 585 } 586 587 /* We need to remove ourself from the global connected sockets list so 588 * incoming packets can't find this socket, and to reduce the reference 589 * count. 590 */ 591 vsock_remove_connected(vsk); 592 593 sk->sk_state = TCP_CLOSE; 594 595 out: 596 release_sock(sk); 597 release_sock(listener); 598 if (cleanup) 599 sock_put(sk); 600 601 sock_put(sk); 602 sock_put(listener); 603 } 604 605 /**** SOCKET OPERATIONS ****/ 606 607 static int __vsock_bind_connectible(struct vsock_sock *vsk, 608 struct sockaddr_vm *addr) 609 { 610 static u32 port; 611 struct sockaddr_vm new_addr; 612 613 if (!port) 614 port = LAST_RESERVED_PORT + 1 + 615 prandom_u32_max(U32_MAX - LAST_RESERVED_PORT); 616 617 vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); 618 619 if (addr->svm_port == VMADDR_PORT_ANY) { 620 bool found = false; 621 unsigned int i; 622 623 for (i = 0; i < MAX_PORT_RETRIES; i++) { 624 if (port <= LAST_RESERVED_PORT) 625 port = LAST_RESERVED_PORT + 1; 626 627 new_addr.svm_port = port++; 628 629 if (!__vsock_find_bound_socket(&new_addr)) { 630 found = true; 631 break; 632 } 633 } 634 635 if (!found) 636 return -EADDRNOTAVAIL; 637 } else { 638 /* If port is in reserved range, ensure caller 639 * has necessary privileges. 640 */ 641 if (addr->svm_port <= LAST_RESERVED_PORT && 642 !capable(CAP_NET_BIND_SERVICE)) { 643 return -EACCES; 644 } 645 646 if (__vsock_find_bound_socket(&new_addr)) 647 return -EADDRINUSE; 648 } 649 650 vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); 651 652 /* Remove stream sockets from the unbound list and add them to the hash 653 * table for easy lookup by its address. The unbound list is simply an 654 * extra entry at the end of the hash table, a trick used by AF_UNIX. 655 */ 656 __vsock_remove_bound(vsk); 657 __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); 658 659 return 0; 660 } 661 662 static int __vsock_bind_dgram(struct vsock_sock *vsk, 663 struct sockaddr_vm *addr) 664 { 665 return vsk->transport->dgram_bind(vsk, addr); 666 } 667 668 static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) 669 { 670 struct vsock_sock *vsk = vsock_sk(sk); 671 int retval; 672 673 /* First ensure this socket isn't already bound. */ 674 if (vsock_addr_bound(&vsk->local_addr)) 675 return -EINVAL; 676 677 /* Now bind to the provided address or select appropriate values if 678 * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that 679 * like AF_INET prevents binding to a non-local IP address (in most 680 * cases), we only allow binding to a local CID. 681 */ 682 if (addr->svm_cid != VMADDR_CID_ANY && !vsock_find_cid(addr->svm_cid)) 683 return -EADDRNOTAVAIL; 684 685 switch (sk->sk_socket->type) { 686 case SOCK_STREAM: 687 spin_lock_bh(&vsock_table_lock); 688 retval = __vsock_bind_connectible(vsk, addr); 689 spin_unlock_bh(&vsock_table_lock); 690 break; 691 692 case SOCK_DGRAM: 693 retval = __vsock_bind_dgram(vsk, addr); 694 break; 695 696 default: 697 retval = -EINVAL; 698 break; 699 } 700 701 return retval; 702 } 703 704 static void vsock_connect_timeout(struct work_struct *work); 705 706 static struct sock *__vsock_create(struct net *net, 707 struct socket *sock, 708 struct sock *parent, 709 gfp_t priority, 710 unsigned short type, 711 int kern) 712 { 713 struct sock *sk; 714 struct vsock_sock *psk; 715 struct vsock_sock *vsk; 716 717 sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); 718 if (!sk) 719 return NULL; 720 721 sock_init_data(sock, sk); 722 723 /* sk->sk_type is normally set in sock_init_data, but only if sock is 724 * non-NULL. We make sure that our sockets always have a type by 725 * setting it here if needed. 726 */ 727 if (!sock) 728 sk->sk_type = type; 729 730 vsk = vsock_sk(sk); 731 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 732 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 733 734 sk->sk_destruct = vsock_sk_destruct; 735 sk->sk_backlog_rcv = vsock_queue_rcv_skb; 736 sock_reset_flag(sk, SOCK_DONE); 737 738 INIT_LIST_HEAD(&vsk->bound_table); 739 INIT_LIST_HEAD(&vsk->connected_table); 740 vsk->listener = NULL; 741 INIT_LIST_HEAD(&vsk->pending_links); 742 INIT_LIST_HEAD(&vsk->accept_queue); 743 vsk->rejected = false; 744 vsk->sent_request = false; 745 vsk->ignore_connecting_rst = false; 746 vsk->peer_shutdown = 0; 747 INIT_DELAYED_WORK(&vsk->connect_work, vsock_connect_timeout); 748 INIT_DELAYED_WORK(&vsk->pending_work, vsock_pending_work); 749 750 psk = parent ? vsock_sk(parent) : NULL; 751 if (parent) { 752 vsk->trusted = psk->trusted; 753 vsk->owner = get_cred(psk->owner); 754 vsk->connect_timeout = psk->connect_timeout; 755 vsk->buffer_size = psk->buffer_size; 756 vsk->buffer_min_size = psk->buffer_min_size; 757 vsk->buffer_max_size = psk->buffer_max_size; 758 security_sk_clone(parent, sk); 759 } else { 760 vsk->trusted = ns_capable_noaudit(&init_user_ns, CAP_NET_ADMIN); 761 vsk->owner = get_current_cred(); 762 vsk->connect_timeout = VSOCK_DEFAULT_CONNECT_TIMEOUT; 763 vsk->buffer_size = VSOCK_DEFAULT_BUFFER_SIZE; 764 vsk->buffer_min_size = VSOCK_DEFAULT_BUFFER_MIN_SIZE; 765 vsk->buffer_max_size = VSOCK_DEFAULT_BUFFER_MAX_SIZE; 766 } 767 768 return sk; 769 } 770 771 static bool sock_type_connectible(u16 type) 772 { 773 return type == SOCK_STREAM; 774 } 775 776 static void __vsock_release(struct sock *sk, int level) 777 { 778 if (sk) { 779 struct sock *pending; 780 struct vsock_sock *vsk; 781 782 vsk = vsock_sk(sk); 783 pending = NULL; /* Compiler warning. */ 784 785 /* When "level" is SINGLE_DEPTH_NESTING, use the nested 786 * version to avoid the warning "possible recursive locking 787 * detected". When "level" is 0, lock_sock_nested(sk, level) 788 * is the same as lock_sock(sk). 789 */ 790 lock_sock_nested(sk, level); 791 792 if (vsk->transport) 793 vsk->transport->release(vsk); 794 else if (sock_type_connectible(sk->sk_type)) 795 vsock_remove_sock(vsk); 796 797 sock_orphan(sk); 798 sk->sk_shutdown = SHUTDOWN_MASK; 799 800 skb_queue_purge(&sk->sk_receive_queue); 801 802 /* Clean up any sockets that never were accepted. */ 803 while ((pending = vsock_dequeue_accept(sk)) != NULL) { 804 __vsock_release(pending, SINGLE_DEPTH_NESTING); 805 sock_put(pending); 806 } 807 808 release_sock(sk); 809 sock_put(sk); 810 } 811 } 812 813 static void vsock_sk_destruct(struct sock *sk) 814 { 815 struct vsock_sock *vsk = vsock_sk(sk); 816 817 vsock_deassign_transport(vsk); 818 819 /* When clearing these addresses, there's no need to set the family and 820 * possibly register the address family with the kernel. 821 */ 822 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 823 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 824 825 put_cred(vsk->owner); 826 } 827 828 static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 829 { 830 int err; 831 832 err = sock_queue_rcv_skb(sk, skb); 833 if (err) 834 kfree_skb(skb); 835 836 return err; 837 } 838 839 struct sock *vsock_create_connected(struct sock *parent) 840 { 841 return __vsock_create(sock_net(parent), NULL, parent, GFP_KERNEL, 842 parent->sk_type, 0); 843 } 844 EXPORT_SYMBOL_GPL(vsock_create_connected); 845 846 s64 vsock_stream_has_data(struct vsock_sock *vsk) 847 { 848 return vsk->transport->stream_has_data(vsk); 849 } 850 EXPORT_SYMBOL_GPL(vsock_stream_has_data); 851 852 s64 vsock_stream_has_space(struct vsock_sock *vsk) 853 { 854 return vsk->transport->stream_has_space(vsk); 855 } 856 EXPORT_SYMBOL_GPL(vsock_stream_has_space); 857 858 static int vsock_release(struct socket *sock) 859 { 860 __vsock_release(sock->sk, 0); 861 sock->sk = NULL; 862 sock->state = SS_FREE; 863 864 return 0; 865 } 866 867 static int 868 vsock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) 869 { 870 int err; 871 struct sock *sk; 872 struct sockaddr_vm *vm_addr; 873 874 sk = sock->sk; 875 876 if (vsock_addr_cast(addr, addr_len, &vm_addr) != 0) 877 return -EINVAL; 878 879 lock_sock(sk); 880 err = __vsock_bind(sk, vm_addr); 881 release_sock(sk); 882 883 return err; 884 } 885 886 static int vsock_getname(struct socket *sock, 887 struct sockaddr *addr, int peer) 888 { 889 int err; 890 struct sock *sk; 891 struct vsock_sock *vsk; 892 struct sockaddr_vm *vm_addr; 893 894 sk = sock->sk; 895 vsk = vsock_sk(sk); 896 err = 0; 897 898 lock_sock(sk); 899 900 if (peer) { 901 if (sock->state != SS_CONNECTED) { 902 err = -ENOTCONN; 903 goto out; 904 } 905 vm_addr = &vsk->remote_addr; 906 } else { 907 vm_addr = &vsk->local_addr; 908 } 909 910 if (!vm_addr) { 911 err = -EINVAL; 912 goto out; 913 } 914 915 /* sys_getsockname() and sys_getpeername() pass us a 916 * MAX_SOCK_ADDR-sized buffer and don't set addr_len. Unfortunately 917 * that macro is defined in socket.c instead of .h, so we hardcode its 918 * value here. 919 */ 920 BUILD_BUG_ON(sizeof(*vm_addr) > 128); 921 memcpy(addr, vm_addr, sizeof(*vm_addr)); 922 err = sizeof(*vm_addr); 923 924 out: 925 release_sock(sk); 926 return err; 927 } 928 929 static int vsock_shutdown(struct socket *sock, int mode) 930 { 931 int err; 932 struct sock *sk; 933 934 /* User level uses SHUT_RD (0) and SHUT_WR (1), but the kernel uses 935 * RCV_SHUTDOWN (1) and SEND_SHUTDOWN (2), so we must increment mode 936 * here like the other address families do. Note also that the 937 * increment makes SHUT_RDWR (2) into RCV_SHUTDOWN | SEND_SHUTDOWN (3), 938 * which is what we want. 939 */ 940 mode++; 941 942 if ((mode & ~SHUTDOWN_MASK) || !mode) 943 return -EINVAL; 944 945 /* If this is a STREAM socket and it is not connected then bail out 946 * immediately. If it is a DGRAM socket then we must first kick the 947 * socket so that it wakes up from any sleeping calls, for example 948 * recv(), and then afterwards return the error. 949 */ 950 951 sk = sock->sk; 952 953 lock_sock(sk); 954 if (sock->state == SS_UNCONNECTED) { 955 err = -ENOTCONN; 956 if (sock_type_connectible(sk->sk_type)) 957 goto out; 958 } else { 959 sock->state = SS_DISCONNECTING; 960 err = 0; 961 } 962 963 /* Receive and send shutdowns are treated alike. */ 964 mode = mode & (RCV_SHUTDOWN | SEND_SHUTDOWN); 965 if (mode) { 966 sk->sk_shutdown |= mode; 967 sk->sk_state_change(sk); 968 969 if (sock_type_connectible(sk->sk_type)) { 970 sock_reset_flag(sk, SOCK_DONE); 971 vsock_send_shutdown(sk, mode); 972 } 973 } 974 975 out: 976 release_sock(sk); 977 return err; 978 } 979 980 static __poll_t vsock_poll(struct file *file, struct socket *sock, 981 poll_table *wait) 982 { 983 struct sock *sk; 984 __poll_t mask; 985 struct vsock_sock *vsk; 986 987 sk = sock->sk; 988 vsk = vsock_sk(sk); 989 990 poll_wait(file, sk_sleep(sk), wait); 991 mask = 0; 992 993 if (sk->sk_err) 994 /* Signify that there has been an error on this socket. */ 995 mask |= EPOLLERR; 996 997 /* INET sockets treat local write shutdown and peer write shutdown as a 998 * case of EPOLLHUP set. 999 */ 1000 if ((sk->sk_shutdown == SHUTDOWN_MASK) || 1001 ((sk->sk_shutdown & SEND_SHUTDOWN) && 1002 (vsk->peer_shutdown & SEND_SHUTDOWN))) { 1003 mask |= EPOLLHUP; 1004 } 1005 1006 if (sk->sk_shutdown & RCV_SHUTDOWN || 1007 vsk->peer_shutdown & SEND_SHUTDOWN) { 1008 mask |= EPOLLRDHUP; 1009 } 1010 1011 if (sock->type == SOCK_DGRAM) { 1012 /* For datagram sockets we can read if there is something in 1013 * the queue and write as long as the socket isn't shutdown for 1014 * sending. 1015 */ 1016 if (!skb_queue_empty_lockless(&sk->sk_receive_queue) || 1017 (sk->sk_shutdown & RCV_SHUTDOWN)) { 1018 mask |= EPOLLIN | EPOLLRDNORM; 1019 } 1020 1021 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 1022 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1023 1024 } else if (sock_type_connectible(sk->sk_type)) { 1025 const struct vsock_transport *transport; 1026 1027 lock_sock(sk); 1028 1029 transport = vsk->transport; 1030 1031 /* Listening sockets that have connections in their accept 1032 * queue can be read. 1033 */ 1034 if (sk->sk_state == TCP_LISTEN 1035 && !vsock_is_accept_queue_empty(sk)) 1036 mask |= EPOLLIN | EPOLLRDNORM; 1037 1038 /* If there is something in the queue then we can read. */ 1039 if (transport && transport->stream_is_active(vsk) && 1040 !(sk->sk_shutdown & RCV_SHUTDOWN)) { 1041 bool data_ready_now = false; 1042 int ret = transport->notify_poll_in( 1043 vsk, 1, &data_ready_now); 1044 if (ret < 0) { 1045 mask |= EPOLLERR; 1046 } else { 1047 if (data_ready_now) 1048 mask |= EPOLLIN | EPOLLRDNORM; 1049 1050 } 1051 } 1052 1053 /* Sockets whose connections have been closed, reset, or 1054 * terminated should also be considered read, and we check the 1055 * shutdown flag for that. 1056 */ 1057 if (sk->sk_shutdown & RCV_SHUTDOWN || 1058 vsk->peer_shutdown & SEND_SHUTDOWN) { 1059 mask |= EPOLLIN | EPOLLRDNORM; 1060 } 1061 1062 /* Connected sockets that can produce data can be written. */ 1063 if (transport && sk->sk_state == TCP_ESTABLISHED) { 1064 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 1065 bool space_avail_now = false; 1066 int ret = transport->notify_poll_out( 1067 vsk, 1, &space_avail_now); 1068 if (ret < 0) { 1069 mask |= EPOLLERR; 1070 } else { 1071 if (space_avail_now) 1072 /* Remove EPOLLWRBAND since INET 1073 * sockets are not setting it. 1074 */ 1075 mask |= EPOLLOUT | EPOLLWRNORM; 1076 1077 } 1078 } 1079 } 1080 1081 /* Simulate INET socket poll behaviors, which sets 1082 * EPOLLOUT|EPOLLWRNORM when peer is closed and nothing to read, 1083 * but local send is not shutdown. 1084 */ 1085 if (sk->sk_state == TCP_CLOSE || sk->sk_state == TCP_CLOSING) { 1086 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 1087 mask |= EPOLLOUT | EPOLLWRNORM; 1088 1089 } 1090 1091 release_sock(sk); 1092 } 1093 1094 return mask; 1095 } 1096 1097 static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, 1098 size_t len) 1099 { 1100 int err; 1101 struct sock *sk; 1102 struct vsock_sock *vsk; 1103 struct sockaddr_vm *remote_addr; 1104 const struct vsock_transport *transport; 1105 1106 if (msg->msg_flags & MSG_OOB) 1107 return -EOPNOTSUPP; 1108 1109 /* For now, MSG_DONTWAIT is always assumed... */ 1110 err = 0; 1111 sk = sock->sk; 1112 vsk = vsock_sk(sk); 1113 1114 lock_sock(sk); 1115 1116 transport = vsk->transport; 1117 1118 err = vsock_auto_bind(vsk); 1119 if (err) 1120 goto out; 1121 1122 1123 /* If the provided message contains an address, use that. Otherwise 1124 * fall back on the socket's remote handle (if it has been connected). 1125 */ 1126 if (msg->msg_name && 1127 vsock_addr_cast(msg->msg_name, msg->msg_namelen, 1128 &remote_addr) == 0) { 1129 /* Ensure this address is of the right type and is a valid 1130 * destination. 1131 */ 1132 1133 if (remote_addr->svm_cid == VMADDR_CID_ANY) 1134 remote_addr->svm_cid = transport->get_local_cid(); 1135 1136 if (!vsock_addr_bound(remote_addr)) { 1137 err = -EINVAL; 1138 goto out; 1139 } 1140 } else if (sock->state == SS_CONNECTED) { 1141 remote_addr = &vsk->remote_addr; 1142 1143 if (remote_addr->svm_cid == VMADDR_CID_ANY) 1144 remote_addr->svm_cid = transport->get_local_cid(); 1145 1146 /* XXX Should connect() or this function ensure remote_addr is 1147 * bound? 1148 */ 1149 if (!vsock_addr_bound(&vsk->remote_addr)) { 1150 err = -EINVAL; 1151 goto out; 1152 } 1153 } else { 1154 err = -EINVAL; 1155 goto out; 1156 } 1157 1158 if (!transport->dgram_allow(remote_addr->svm_cid, 1159 remote_addr->svm_port)) { 1160 err = -EINVAL; 1161 goto out; 1162 } 1163 1164 err = transport->dgram_enqueue(vsk, remote_addr, msg, len); 1165 1166 out: 1167 release_sock(sk); 1168 return err; 1169 } 1170 1171 static int vsock_dgram_connect(struct socket *sock, 1172 struct sockaddr *addr, int addr_len, int flags) 1173 { 1174 int err; 1175 struct sock *sk; 1176 struct vsock_sock *vsk; 1177 struct sockaddr_vm *remote_addr; 1178 1179 sk = sock->sk; 1180 vsk = vsock_sk(sk); 1181 1182 err = vsock_addr_cast(addr, addr_len, &remote_addr); 1183 if (err == -EAFNOSUPPORT && remote_addr->svm_family == AF_UNSPEC) { 1184 lock_sock(sk); 1185 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, 1186 VMADDR_PORT_ANY); 1187 sock->state = SS_UNCONNECTED; 1188 release_sock(sk); 1189 return 0; 1190 } else if (err != 0) 1191 return -EINVAL; 1192 1193 lock_sock(sk); 1194 1195 err = vsock_auto_bind(vsk); 1196 if (err) 1197 goto out; 1198 1199 if (!vsk->transport->dgram_allow(remote_addr->svm_cid, 1200 remote_addr->svm_port)) { 1201 err = -EINVAL; 1202 goto out; 1203 } 1204 1205 memcpy(&vsk->remote_addr, remote_addr, sizeof(vsk->remote_addr)); 1206 sock->state = SS_CONNECTED; 1207 1208 out: 1209 release_sock(sk); 1210 return err; 1211 } 1212 1213 static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, 1214 size_t len, int flags) 1215 { 1216 struct vsock_sock *vsk = vsock_sk(sock->sk); 1217 1218 return vsk->transport->dgram_dequeue(vsk, msg, len, flags); 1219 } 1220 1221 static const struct proto_ops vsock_dgram_ops = { 1222 .family = PF_VSOCK, 1223 .owner = THIS_MODULE, 1224 .release = vsock_release, 1225 .bind = vsock_bind, 1226 .connect = vsock_dgram_connect, 1227 .socketpair = sock_no_socketpair, 1228 .accept = sock_no_accept, 1229 .getname = vsock_getname, 1230 .poll = vsock_poll, 1231 .ioctl = sock_no_ioctl, 1232 .listen = sock_no_listen, 1233 .shutdown = vsock_shutdown, 1234 .sendmsg = vsock_dgram_sendmsg, 1235 .recvmsg = vsock_dgram_recvmsg, 1236 .mmap = sock_no_mmap, 1237 .sendpage = sock_no_sendpage, 1238 }; 1239 1240 static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) 1241 { 1242 const struct vsock_transport *transport = vsk->transport; 1243 1244 if (!transport || !transport->cancel_pkt) 1245 return -EOPNOTSUPP; 1246 1247 return transport->cancel_pkt(vsk); 1248 } 1249 1250 static void vsock_connect_timeout(struct work_struct *work) 1251 { 1252 struct sock *sk; 1253 struct vsock_sock *vsk; 1254 1255 vsk = container_of(work, struct vsock_sock, connect_work.work); 1256 sk = sk_vsock(vsk); 1257 1258 lock_sock(sk); 1259 if (sk->sk_state == TCP_SYN_SENT && 1260 (sk->sk_shutdown != SHUTDOWN_MASK)) { 1261 sk->sk_state = TCP_CLOSE; 1262 sk->sk_err = ETIMEDOUT; 1263 sk->sk_error_report(sk); 1264 vsock_transport_cancel_pkt(vsk); 1265 } 1266 release_sock(sk); 1267 1268 sock_put(sk); 1269 } 1270 1271 static int vsock_connect(struct socket *sock, struct sockaddr *addr, 1272 int addr_len, int flags) 1273 { 1274 int err; 1275 struct sock *sk; 1276 struct vsock_sock *vsk; 1277 const struct vsock_transport *transport; 1278 struct sockaddr_vm *remote_addr; 1279 long timeout; 1280 DEFINE_WAIT(wait); 1281 1282 err = 0; 1283 sk = sock->sk; 1284 vsk = vsock_sk(sk); 1285 1286 lock_sock(sk); 1287 1288 /* XXX AF_UNSPEC should make us disconnect like AF_INET. */ 1289 switch (sock->state) { 1290 case SS_CONNECTED: 1291 err = -EISCONN; 1292 goto out; 1293 case SS_DISCONNECTING: 1294 err = -EINVAL; 1295 goto out; 1296 case SS_CONNECTING: 1297 /* This continues on so we can move sock into the SS_CONNECTED 1298 * state once the connection has completed (at which point err 1299 * will be set to zero also). Otherwise, we will either wait 1300 * for the connection or return -EALREADY should this be a 1301 * non-blocking call. 1302 */ 1303 err = -EALREADY; 1304 break; 1305 default: 1306 if ((sk->sk_state == TCP_LISTEN) || 1307 vsock_addr_cast(addr, addr_len, &remote_addr) != 0) { 1308 err = -EINVAL; 1309 goto out; 1310 } 1311 1312 /* Set the remote address that we are connecting to. */ 1313 memcpy(&vsk->remote_addr, remote_addr, 1314 sizeof(vsk->remote_addr)); 1315 1316 err = vsock_assign_transport(vsk, NULL); 1317 if (err) 1318 goto out; 1319 1320 transport = vsk->transport; 1321 1322 /* The hypervisor and well-known contexts do not have socket 1323 * endpoints. 1324 */ 1325 if (!transport || 1326 !transport->stream_allow(remote_addr->svm_cid, 1327 remote_addr->svm_port)) { 1328 err = -ENETUNREACH; 1329 goto out; 1330 } 1331 1332 err = vsock_auto_bind(vsk); 1333 if (err) 1334 goto out; 1335 1336 sk->sk_state = TCP_SYN_SENT; 1337 1338 err = transport->connect(vsk); 1339 if (err < 0) 1340 goto out; 1341 1342 /* Mark sock as connecting and set the error code to in 1343 * progress in case this is a non-blocking connect. 1344 */ 1345 sock->state = SS_CONNECTING; 1346 err = -EINPROGRESS; 1347 } 1348 1349 /* The receive path will handle all communication until we are able to 1350 * enter the connected state. Here we wait for the connection to be 1351 * completed or a notification of an error. 1352 */ 1353 timeout = vsk->connect_timeout; 1354 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1355 1356 while (sk->sk_state != TCP_ESTABLISHED && sk->sk_err == 0) { 1357 if (flags & O_NONBLOCK) { 1358 /* If we're not going to block, we schedule a timeout 1359 * function to generate a timeout on the connection 1360 * attempt, in case the peer doesn't respond in a 1361 * timely manner. We hold on to the socket until the 1362 * timeout fires. 1363 */ 1364 sock_hold(sk); 1365 schedule_delayed_work(&vsk->connect_work, timeout); 1366 1367 /* Skip ahead to preserve error code set above. */ 1368 goto out_wait; 1369 } 1370 1371 release_sock(sk); 1372 timeout = schedule_timeout(timeout); 1373 lock_sock(sk); 1374 1375 if (signal_pending(current)) { 1376 err = sock_intr_errno(timeout); 1377 sk->sk_state = TCP_CLOSE; 1378 sock->state = SS_UNCONNECTED; 1379 vsock_transport_cancel_pkt(vsk); 1380 goto out_wait; 1381 } else if (timeout == 0) { 1382 err = -ETIMEDOUT; 1383 sk->sk_state = TCP_CLOSE; 1384 sock->state = SS_UNCONNECTED; 1385 vsock_transport_cancel_pkt(vsk); 1386 goto out_wait; 1387 } 1388 1389 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1390 } 1391 1392 if (sk->sk_err) { 1393 err = -sk->sk_err; 1394 sk->sk_state = TCP_CLOSE; 1395 sock->state = SS_UNCONNECTED; 1396 } else { 1397 err = 0; 1398 } 1399 1400 out_wait: 1401 finish_wait(sk_sleep(sk), &wait); 1402 out: 1403 release_sock(sk); 1404 return err; 1405 } 1406 1407 static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, 1408 bool kern) 1409 { 1410 struct sock *listener; 1411 int err; 1412 struct sock *connected; 1413 struct vsock_sock *vconnected; 1414 long timeout; 1415 DEFINE_WAIT(wait); 1416 1417 err = 0; 1418 listener = sock->sk; 1419 1420 lock_sock(listener); 1421 1422 if (!sock_type_connectible(sock->type)) { 1423 err = -EOPNOTSUPP; 1424 goto out; 1425 } 1426 1427 if (listener->sk_state != TCP_LISTEN) { 1428 err = -EINVAL; 1429 goto out; 1430 } 1431 1432 /* Wait for children sockets to appear; these are the new sockets 1433 * created upon connection establishment. 1434 */ 1435 timeout = sock_rcvtimeo(listener, flags & O_NONBLOCK); 1436 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1437 1438 while ((connected = vsock_dequeue_accept(listener)) == NULL && 1439 listener->sk_err == 0) { 1440 release_sock(listener); 1441 timeout = schedule_timeout(timeout); 1442 finish_wait(sk_sleep(listener), &wait); 1443 lock_sock(listener); 1444 1445 if (signal_pending(current)) { 1446 err = sock_intr_errno(timeout); 1447 goto out; 1448 } else if (timeout == 0) { 1449 err = -EAGAIN; 1450 goto out; 1451 } 1452 1453 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1454 } 1455 finish_wait(sk_sleep(listener), &wait); 1456 1457 if (listener->sk_err) 1458 err = -listener->sk_err; 1459 1460 if (connected) { 1461 sk_acceptq_removed(listener); 1462 1463 lock_sock_nested(connected, SINGLE_DEPTH_NESTING); 1464 vconnected = vsock_sk(connected); 1465 1466 /* If the listener socket has received an error, then we should 1467 * reject this socket and return. Note that we simply mark the 1468 * socket rejected, drop our reference, and let the cleanup 1469 * function handle the cleanup; the fact that we found it in 1470 * the listener's accept queue guarantees that the cleanup 1471 * function hasn't run yet. 1472 */ 1473 if (err) { 1474 vconnected->rejected = true; 1475 } else { 1476 newsock->state = SS_CONNECTED; 1477 sock_graft(connected, newsock); 1478 } 1479 1480 release_sock(connected); 1481 sock_put(connected); 1482 } 1483 1484 out: 1485 release_sock(listener); 1486 return err; 1487 } 1488 1489 static int vsock_listen(struct socket *sock, int backlog) 1490 { 1491 int err; 1492 struct sock *sk; 1493 struct vsock_sock *vsk; 1494 1495 sk = sock->sk; 1496 1497 lock_sock(sk); 1498 1499 if (!sock_type_connectible(sk->sk_type)) { 1500 err = -EOPNOTSUPP; 1501 goto out; 1502 } 1503 1504 if (sock->state != SS_UNCONNECTED) { 1505 err = -EINVAL; 1506 goto out; 1507 } 1508 1509 vsk = vsock_sk(sk); 1510 1511 if (!vsock_addr_bound(&vsk->local_addr)) { 1512 err = -EINVAL; 1513 goto out; 1514 } 1515 1516 sk->sk_max_ack_backlog = backlog; 1517 sk->sk_state = TCP_LISTEN; 1518 1519 err = 0; 1520 1521 out: 1522 release_sock(sk); 1523 return err; 1524 } 1525 1526 static void vsock_update_buffer_size(struct vsock_sock *vsk, 1527 const struct vsock_transport *transport, 1528 u64 val) 1529 { 1530 if (val > vsk->buffer_max_size) 1531 val = vsk->buffer_max_size; 1532 1533 if (val < vsk->buffer_min_size) 1534 val = vsk->buffer_min_size; 1535 1536 if (val != vsk->buffer_size && 1537 transport && transport->notify_buffer_size) 1538 transport->notify_buffer_size(vsk, &val); 1539 1540 vsk->buffer_size = val; 1541 } 1542 1543 static int vsock_connectible_setsockopt(struct socket *sock, 1544 int level, 1545 int optname, 1546 sockptr_t optval, 1547 unsigned int optlen) 1548 { 1549 int err; 1550 struct sock *sk; 1551 struct vsock_sock *vsk; 1552 const struct vsock_transport *transport; 1553 u64 val; 1554 1555 if (level != AF_VSOCK) 1556 return -ENOPROTOOPT; 1557 1558 #define COPY_IN(_v) \ 1559 do { \ 1560 if (optlen < sizeof(_v)) { \ 1561 err = -EINVAL; \ 1562 goto exit; \ 1563 } \ 1564 if (copy_from_sockptr(&_v, optval, sizeof(_v)) != 0) { \ 1565 err = -EFAULT; \ 1566 goto exit; \ 1567 } \ 1568 } while (0) 1569 1570 err = 0; 1571 sk = sock->sk; 1572 vsk = vsock_sk(sk); 1573 1574 lock_sock(sk); 1575 1576 transport = vsk->transport; 1577 1578 switch (optname) { 1579 case SO_VM_SOCKETS_BUFFER_SIZE: 1580 COPY_IN(val); 1581 vsock_update_buffer_size(vsk, transport, val); 1582 break; 1583 1584 case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1585 COPY_IN(val); 1586 vsk->buffer_max_size = val; 1587 vsock_update_buffer_size(vsk, transport, vsk->buffer_size); 1588 break; 1589 1590 case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1591 COPY_IN(val); 1592 vsk->buffer_min_size = val; 1593 vsock_update_buffer_size(vsk, transport, vsk->buffer_size); 1594 break; 1595 1596 case SO_VM_SOCKETS_CONNECT_TIMEOUT: { 1597 struct __kernel_old_timeval tv; 1598 COPY_IN(tv); 1599 if (tv.tv_sec >= 0 && tv.tv_usec < USEC_PER_SEC && 1600 tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) { 1601 vsk->connect_timeout = tv.tv_sec * HZ + 1602 DIV_ROUND_UP(tv.tv_usec, (1000000 / HZ)); 1603 if (vsk->connect_timeout == 0) 1604 vsk->connect_timeout = 1605 VSOCK_DEFAULT_CONNECT_TIMEOUT; 1606 1607 } else { 1608 err = -ERANGE; 1609 } 1610 break; 1611 } 1612 1613 default: 1614 err = -ENOPROTOOPT; 1615 break; 1616 } 1617 1618 #undef COPY_IN 1619 1620 exit: 1621 release_sock(sk); 1622 return err; 1623 } 1624 1625 static int vsock_connectible_getsockopt(struct socket *sock, 1626 int level, int optname, 1627 char __user *optval, 1628 int __user *optlen) 1629 { 1630 int err; 1631 int len; 1632 struct sock *sk; 1633 struct vsock_sock *vsk; 1634 u64 val; 1635 1636 if (level != AF_VSOCK) 1637 return -ENOPROTOOPT; 1638 1639 err = get_user(len, optlen); 1640 if (err != 0) 1641 return err; 1642 1643 #define COPY_OUT(_v) \ 1644 do { \ 1645 if (len < sizeof(_v)) \ 1646 return -EINVAL; \ 1647 \ 1648 len = sizeof(_v); \ 1649 if (copy_to_user(optval, &_v, len) != 0) \ 1650 return -EFAULT; \ 1651 \ 1652 } while (0) 1653 1654 err = 0; 1655 sk = sock->sk; 1656 vsk = vsock_sk(sk); 1657 1658 switch (optname) { 1659 case SO_VM_SOCKETS_BUFFER_SIZE: 1660 val = vsk->buffer_size; 1661 COPY_OUT(val); 1662 break; 1663 1664 case SO_VM_SOCKETS_BUFFER_MAX_SIZE: 1665 val = vsk->buffer_max_size; 1666 COPY_OUT(val); 1667 break; 1668 1669 case SO_VM_SOCKETS_BUFFER_MIN_SIZE: 1670 val = vsk->buffer_min_size; 1671 COPY_OUT(val); 1672 break; 1673 1674 case SO_VM_SOCKETS_CONNECT_TIMEOUT: { 1675 struct __kernel_old_timeval tv; 1676 tv.tv_sec = vsk->connect_timeout / HZ; 1677 tv.tv_usec = 1678 (vsk->connect_timeout - 1679 tv.tv_sec * HZ) * (1000000 / HZ); 1680 COPY_OUT(tv); 1681 break; 1682 } 1683 default: 1684 return -ENOPROTOOPT; 1685 } 1686 1687 err = put_user(len, optlen); 1688 if (err != 0) 1689 return -EFAULT; 1690 1691 #undef COPY_OUT 1692 1693 return 0; 1694 } 1695 1696 static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, 1697 size_t len) 1698 { 1699 struct sock *sk; 1700 struct vsock_sock *vsk; 1701 const struct vsock_transport *transport; 1702 ssize_t total_written; 1703 long timeout; 1704 int err; 1705 struct vsock_transport_send_notify_data send_data; 1706 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1707 1708 sk = sock->sk; 1709 vsk = vsock_sk(sk); 1710 total_written = 0; 1711 err = 0; 1712 1713 if (msg->msg_flags & MSG_OOB) 1714 return -EOPNOTSUPP; 1715 1716 lock_sock(sk); 1717 1718 transport = vsk->transport; 1719 1720 /* Callers should not provide a destination with stream sockets. */ 1721 if (msg->msg_namelen) { 1722 err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; 1723 goto out; 1724 } 1725 1726 /* Send data only if both sides are not shutdown in the direction. */ 1727 if (sk->sk_shutdown & SEND_SHUTDOWN || 1728 vsk->peer_shutdown & RCV_SHUTDOWN) { 1729 err = -EPIPE; 1730 goto out; 1731 } 1732 1733 if (!transport || sk->sk_state != TCP_ESTABLISHED || 1734 !vsock_addr_bound(&vsk->local_addr)) { 1735 err = -ENOTCONN; 1736 goto out; 1737 } 1738 1739 if (!vsock_addr_bound(&vsk->remote_addr)) { 1740 err = -EDESTADDRREQ; 1741 goto out; 1742 } 1743 1744 /* Wait for room in the produce queue to enqueue our user's data. */ 1745 timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 1746 1747 err = transport->notify_send_init(vsk, &send_data); 1748 if (err < 0) 1749 goto out; 1750 1751 while (total_written < len) { 1752 ssize_t written; 1753 1754 add_wait_queue(sk_sleep(sk), &wait); 1755 while (vsock_stream_has_space(vsk) == 0 && 1756 sk->sk_err == 0 && 1757 !(sk->sk_shutdown & SEND_SHUTDOWN) && 1758 !(vsk->peer_shutdown & RCV_SHUTDOWN)) { 1759 1760 /* Don't wait for non-blocking sockets. */ 1761 if (timeout == 0) { 1762 err = -EAGAIN; 1763 remove_wait_queue(sk_sleep(sk), &wait); 1764 goto out_err; 1765 } 1766 1767 err = transport->notify_send_pre_block(vsk, &send_data); 1768 if (err < 0) { 1769 remove_wait_queue(sk_sleep(sk), &wait); 1770 goto out_err; 1771 } 1772 1773 release_sock(sk); 1774 timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); 1775 lock_sock(sk); 1776 if (signal_pending(current)) { 1777 err = sock_intr_errno(timeout); 1778 remove_wait_queue(sk_sleep(sk), &wait); 1779 goto out_err; 1780 } else if (timeout == 0) { 1781 err = -EAGAIN; 1782 remove_wait_queue(sk_sleep(sk), &wait); 1783 goto out_err; 1784 } 1785 } 1786 remove_wait_queue(sk_sleep(sk), &wait); 1787 1788 /* These checks occur both as part of and after the loop 1789 * conditional since we need to check before and after 1790 * sleeping. 1791 */ 1792 if (sk->sk_err) { 1793 err = -sk->sk_err; 1794 goto out_err; 1795 } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || 1796 (vsk->peer_shutdown & RCV_SHUTDOWN)) { 1797 err = -EPIPE; 1798 goto out_err; 1799 } 1800 1801 err = transport->notify_send_pre_enqueue(vsk, &send_data); 1802 if (err < 0) 1803 goto out_err; 1804 1805 /* Note that enqueue will only write as many bytes as are free 1806 * in the produce queue, so we don't need to ensure len is 1807 * smaller than the queue size. It is the caller's 1808 * responsibility to check how many bytes we were able to send. 1809 */ 1810 1811 written = transport->stream_enqueue( 1812 vsk, msg, 1813 len - total_written); 1814 if (written < 0) { 1815 err = -ENOMEM; 1816 goto out_err; 1817 } 1818 1819 total_written += written; 1820 1821 err = transport->notify_send_post_enqueue( 1822 vsk, written, &send_data); 1823 if (err < 0) 1824 goto out_err; 1825 1826 } 1827 1828 out_err: 1829 if (total_written > 0) 1830 err = total_written; 1831 out: 1832 release_sock(sk); 1833 return err; 1834 } 1835 1836 static int vsock_wait_data(struct sock *sk, struct wait_queue_entry *wait, 1837 long timeout, 1838 struct vsock_transport_recv_notify_data *recv_data, 1839 size_t target) 1840 { 1841 const struct vsock_transport *transport; 1842 struct vsock_sock *vsk; 1843 s64 data; 1844 int err; 1845 1846 vsk = vsock_sk(sk); 1847 err = 0; 1848 transport = vsk->transport; 1849 1850 while ((data = vsock_stream_has_data(vsk)) == 0) { 1851 prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE); 1852 1853 if (sk->sk_err != 0 || 1854 (sk->sk_shutdown & RCV_SHUTDOWN) || 1855 (vsk->peer_shutdown & SEND_SHUTDOWN)) { 1856 break; 1857 } 1858 1859 /* Don't wait for non-blocking sockets. */ 1860 if (timeout == 0) { 1861 err = -EAGAIN; 1862 break; 1863 } 1864 1865 if (recv_data) { 1866 err = transport->notify_recv_pre_block(vsk, target, recv_data); 1867 if (err < 0) 1868 break; 1869 } 1870 1871 release_sock(sk); 1872 timeout = schedule_timeout(timeout); 1873 lock_sock(sk); 1874 1875 if (signal_pending(current)) { 1876 err = sock_intr_errno(timeout); 1877 break; 1878 } else if (timeout == 0) { 1879 err = -EAGAIN; 1880 break; 1881 } 1882 } 1883 1884 finish_wait(sk_sleep(sk), wait); 1885 1886 if (err) 1887 return err; 1888 1889 /* Internal transport error when checking for available 1890 * data. XXX This should be changed to a connection 1891 * reset in a later change. 1892 */ 1893 if (data < 0) 1894 return -ENOMEM; 1895 1896 return data; 1897 } 1898 1899 static int __vsock_stream_recvmsg(struct sock *sk, struct msghdr *msg, 1900 size_t len, int flags) 1901 { 1902 struct vsock_transport_recv_notify_data recv_data; 1903 const struct vsock_transport *transport; 1904 struct vsock_sock *vsk; 1905 ssize_t copied; 1906 size_t target; 1907 long timeout; 1908 int err; 1909 1910 DEFINE_WAIT(wait); 1911 1912 vsk = vsock_sk(sk); 1913 transport = vsk->transport; 1914 1915 /* We must not copy less than target bytes into the user's buffer 1916 * before returning successfully, so we wait for the consume queue to 1917 * have that much data to consume before dequeueing. Note that this 1918 * makes it impossible to handle cases where target is greater than the 1919 * queue size. 1920 */ 1921 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); 1922 if (target >= transport->stream_rcvhiwat(vsk)) { 1923 err = -ENOMEM; 1924 goto out; 1925 } 1926 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1927 copied = 0; 1928 1929 err = transport->notify_recv_init(vsk, target, &recv_data); 1930 if (err < 0) 1931 goto out; 1932 1933 1934 while (1) { 1935 ssize_t read; 1936 1937 err = vsock_wait_data(sk, &wait, timeout, &recv_data, target); 1938 if (err <= 0) 1939 break; 1940 1941 err = transport->notify_recv_pre_dequeue(vsk, target, 1942 &recv_data); 1943 if (err < 0) 1944 break; 1945 1946 read = transport->stream_dequeue(vsk, msg, len - copied, flags); 1947 if (read < 0) { 1948 err = -ENOMEM; 1949 break; 1950 } 1951 1952 copied += read; 1953 1954 err = transport->notify_recv_post_dequeue(vsk, target, read, 1955 !(flags & MSG_PEEK), &recv_data); 1956 if (err < 0) 1957 goto out; 1958 1959 if (read >= target || flags & MSG_PEEK) 1960 break; 1961 1962 target -= read; 1963 } 1964 1965 if (sk->sk_err) 1966 err = -sk->sk_err; 1967 else if (sk->sk_shutdown & RCV_SHUTDOWN) 1968 err = 0; 1969 1970 if (copied > 0) 1971 err = copied; 1972 1973 out: 1974 return err; 1975 } 1976 1977 static int 1978 vsock_connectible_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 1979 int flags) 1980 { 1981 struct sock *sk; 1982 struct vsock_sock *vsk; 1983 const struct vsock_transport *transport; 1984 int err; 1985 1986 DEFINE_WAIT(wait); 1987 1988 sk = sock->sk; 1989 vsk = vsock_sk(sk); 1990 err = 0; 1991 1992 lock_sock(sk); 1993 1994 transport = vsk->transport; 1995 1996 if (!transport || sk->sk_state != TCP_ESTABLISHED) { 1997 /* Recvmsg is supposed to return 0 if a peer performs an 1998 * orderly shutdown. Differentiate between that case and when a 1999 * peer has not connected or a local shutdown occurred with the 2000 * SOCK_DONE flag. 2001 */ 2002 if (sock_flag(sk, SOCK_DONE)) 2003 err = 0; 2004 else 2005 err = -ENOTCONN; 2006 2007 goto out; 2008 } 2009 2010 if (flags & MSG_OOB) { 2011 err = -EOPNOTSUPP; 2012 goto out; 2013 } 2014 2015 /* We don't check peer_shutdown flag here since peer may actually shut 2016 * down, but there can be data in the queue that a local socket can 2017 * receive. 2018 */ 2019 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2020 err = 0; 2021 goto out; 2022 } 2023 2024 /* It is valid on Linux to pass in a zero-length receive buffer. This 2025 * is not an error. We may as well bail out now. 2026 */ 2027 if (!len) { 2028 err = 0; 2029 goto out; 2030 } 2031 2032 err = __vsock_stream_recvmsg(sk, msg, len, flags); 2033 2034 out: 2035 release_sock(sk); 2036 return err; 2037 } 2038 2039 static const struct proto_ops vsock_stream_ops = { 2040 .family = PF_VSOCK, 2041 .owner = THIS_MODULE, 2042 .release = vsock_release, 2043 .bind = vsock_bind, 2044 .connect = vsock_connect, 2045 .socketpair = sock_no_socketpair, 2046 .accept = vsock_accept, 2047 .getname = vsock_getname, 2048 .poll = vsock_poll, 2049 .ioctl = sock_no_ioctl, 2050 .listen = vsock_listen, 2051 .shutdown = vsock_shutdown, 2052 .setsockopt = vsock_connectible_setsockopt, 2053 .getsockopt = vsock_connectible_getsockopt, 2054 .sendmsg = vsock_connectible_sendmsg, 2055 .recvmsg = vsock_connectible_recvmsg, 2056 .mmap = sock_no_mmap, 2057 .sendpage = sock_no_sendpage, 2058 }; 2059 2060 static int vsock_create(struct net *net, struct socket *sock, 2061 int protocol, int kern) 2062 { 2063 struct vsock_sock *vsk; 2064 struct sock *sk; 2065 int ret; 2066 2067 if (!sock) 2068 return -EINVAL; 2069 2070 if (protocol && protocol != PF_VSOCK) 2071 return -EPROTONOSUPPORT; 2072 2073 switch (sock->type) { 2074 case SOCK_DGRAM: 2075 sock->ops = &vsock_dgram_ops; 2076 break; 2077 case SOCK_STREAM: 2078 sock->ops = &vsock_stream_ops; 2079 break; 2080 default: 2081 return -ESOCKTNOSUPPORT; 2082 } 2083 2084 sock->state = SS_UNCONNECTED; 2085 2086 sk = __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern); 2087 if (!sk) 2088 return -ENOMEM; 2089 2090 vsk = vsock_sk(sk); 2091 2092 if (sock->type == SOCK_DGRAM) { 2093 ret = vsock_assign_transport(vsk, NULL); 2094 if (ret < 0) { 2095 sock_put(sk); 2096 return ret; 2097 } 2098 } 2099 2100 vsock_insert_unbound(vsk); 2101 2102 return 0; 2103 } 2104 2105 static const struct net_proto_family vsock_family_ops = { 2106 .family = AF_VSOCK, 2107 .create = vsock_create, 2108 .owner = THIS_MODULE, 2109 }; 2110 2111 static long vsock_dev_do_ioctl(struct file *filp, 2112 unsigned int cmd, void __user *ptr) 2113 { 2114 u32 __user *p = ptr; 2115 u32 cid = VMADDR_CID_ANY; 2116 int retval = 0; 2117 2118 switch (cmd) { 2119 case IOCTL_VM_SOCKETS_GET_LOCAL_CID: 2120 /* To be compatible with the VMCI behavior, we prioritize the 2121 * guest CID instead of well-know host CID (VMADDR_CID_HOST). 2122 */ 2123 if (transport_g2h) 2124 cid = transport_g2h->get_local_cid(); 2125 else if (transport_h2g) 2126 cid = transport_h2g->get_local_cid(); 2127 2128 if (put_user(cid, p) != 0) 2129 retval = -EFAULT; 2130 break; 2131 2132 default: 2133 retval = -ENOIOCTLCMD; 2134 } 2135 2136 return retval; 2137 } 2138 2139 static long vsock_dev_ioctl(struct file *filp, 2140 unsigned int cmd, unsigned long arg) 2141 { 2142 return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); 2143 } 2144 2145 #ifdef CONFIG_COMPAT 2146 static long vsock_dev_compat_ioctl(struct file *filp, 2147 unsigned int cmd, unsigned long arg) 2148 { 2149 return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); 2150 } 2151 #endif 2152 2153 static const struct file_operations vsock_device_ops = { 2154 .owner = THIS_MODULE, 2155 .unlocked_ioctl = vsock_dev_ioctl, 2156 #ifdef CONFIG_COMPAT 2157 .compat_ioctl = vsock_dev_compat_ioctl, 2158 #endif 2159 .open = nonseekable_open, 2160 }; 2161 2162 static struct miscdevice vsock_device = { 2163 .name = "vsock", 2164 .fops = &vsock_device_ops, 2165 }; 2166 2167 static int __init vsock_init(void) 2168 { 2169 int err = 0; 2170 2171 vsock_init_tables(); 2172 2173 vsock_proto.owner = THIS_MODULE; 2174 vsock_device.minor = MISC_DYNAMIC_MINOR; 2175 err = misc_register(&vsock_device); 2176 if (err) { 2177 pr_err("Failed to register misc device\n"); 2178 goto err_reset_transport; 2179 } 2180 2181 err = proto_register(&vsock_proto, 1); /* we want our slab */ 2182 if (err) { 2183 pr_err("Cannot register vsock protocol\n"); 2184 goto err_deregister_misc; 2185 } 2186 2187 err = sock_register(&vsock_family_ops); 2188 if (err) { 2189 pr_err("could not register af_vsock (%d) address family: %d\n", 2190 AF_VSOCK, err); 2191 goto err_unregister_proto; 2192 } 2193 2194 return 0; 2195 2196 err_unregister_proto: 2197 proto_unregister(&vsock_proto); 2198 err_deregister_misc: 2199 misc_deregister(&vsock_device); 2200 err_reset_transport: 2201 return err; 2202 } 2203 2204 static void __exit vsock_exit(void) 2205 { 2206 misc_deregister(&vsock_device); 2207 sock_unregister(AF_VSOCK); 2208 proto_unregister(&vsock_proto); 2209 } 2210 2211 const struct vsock_transport *vsock_core_get_transport(struct vsock_sock *vsk) 2212 { 2213 return vsk->transport; 2214 } 2215 EXPORT_SYMBOL_GPL(vsock_core_get_transport); 2216 2217 int vsock_core_register(const struct vsock_transport *t, int features) 2218 { 2219 const struct vsock_transport *t_h2g, *t_g2h, *t_dgram, *t_local; 2220 int err = mutex_lock_interruptible(&vsock_register_mutex); 2221 2222 if (err) 2223 return err; 2224 2225 t_h2g = transport_h2g; 2226 t_g2h = transport_g2h; 2227 t_dgram = transport_dgram; 2228 t_local = transport_local; 2229 2230 if (features & VSOCK_TRANSPORT_F_H2G) { 2231 if (t_h2g) { 2232 err = -EBUSY; 2233 goto err_busy; 2234 } 2235 t_h2g = t; 2236 } 2237 2238 if (features & VSOCK_TRANSPORT_F_G2H) { 2239 if (t_g2h) { 2240 err = -EBUSY; 2241 goto err_busy; 2242 } 2243 t_g2h = t; 2244 } 2245 2246 if (features & VSOCK_TRANSPORT_F_DGRAM) { 2247 if (t_dgram) { 2248 err = -EBUSY; 2249 goto err_busy; 2250 } 2251 t_dgram = t; 2252 } 2253 2254 if (features & VSOCK_TRANSPORT_F_LOCAL) { 2255 if (t_local) { 2256 err = -EBUSY; 2257 goto err_busy; 2258 } 2259 t_local = t; 2260 } 2261 2262 transport_h2g = t_h2g; 2263 transport_g2h = t_g2h; 2264 transport_dgram = t_dgram; 2265 transport_local = t_local; 2266 2267 err_busy: 2268 mutex_unlock(&vsock_register_mutex); 2269 return err; 2270 } 2271 EXPORT_SYMBOL_GPL(vsock_core_register); 2272 2273 void vsock_core_unregister(const struct vsock_transport *t) 2274 { 2275 mutex_lock(&vsock_register_mutex); 2276 2277 if (transport_h2g == t) 2278 transport_h2g = NULL; 2279 2280 if (transport_g2h == t) 2281 transport_g2h = NULL; 2282 2283 if (transport_dgram == t) 2284 transport_dgram = NULL; 2285 2286 if (transport_local == t) 2287 transport_local = NULL; 2288 2289 mutex_unlock(&vsock_register_mutex); 2290 } 2291 EXPORT_SYMBOL_GPL(vsock_core_unregister); 2292 2293 module_init(vsock_init); 2294 module_exit(vsock_exit); 2295 2296 MODULE_AUTHOR("VMware, Inc."); 2297 MODULE_DESCRIPTION("VMware Virtual Socket Family"); 2298 MODULE_VERSION("1.0.2.0-k"); 2299 MODULE_LICENSE("GPL v2"); 2300