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 39 * implementation because they are in the TCP_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. 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 * 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 * 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 * - sk->sk_state uses the TCP state constants because they are widely used by 87 * other address families and exposed to userspace tools like ss(8): 88 * 89 * TCP_CLOSE - unconnected 90 * TCP_SYN_SENT - connecting 91 * TCP_ESTABLISHED - connected 92 * TCP_CLOSING - disconnecting 93 * TCP_LISTEN - listening 94 */ 95 96 #include <linux/types.h> 97 #include <linux/bitops.h> 98 #include <linux/cred.h> 99 #include <linux/init.h> 100 #include <linux/io.h> 101 #include <linux/kernel.h> 102 #include <linux/sched/signal.h> 103 #include <linux/kmod.h> 104 #include <linux/list.h> 105 #include <linux/miscdevice.h> 106 #include <linux/module.h> 107 #include <linux/mutex.h> 108 #include <linux/net.h> 109 #include <linux/poll.h> 110 #include <linux/skbuff.h> 111 #include <linux/smp.h> 112 #include <linux/socket.h> 113 #include <linux/stddef.h> 114 #include <linux/unistd.h> 115 #include <linux/wait.h> 116 #include <linux/workqueue.h> 117 #include <net/sock.h> 118 #include <net/af_vsock.h> 119 120 static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr); 121 static void vsock_sk_destruct(struct sock *sk); 122 static int vsock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 123 124 /* Protocol family. */ 125 static struct proto vsock_proto = { 126 .name = "AF_VSOCK", 127 .owner = THIS_MODULE, 128 .obj_size = sizeof(struct vsock_sock), 129 }; 130 131 /* The default peer timeout indicates how long we will wait for a peer response 132 * to a control message. 133 */ 134 #define VSOCK_DEFAULT_CONNECT_TIMEOUT (2 * HZ) 135 136 static const struct vsock_transport *transport; 137 static DEFINE_MUTEX(vsock_register_mutex); 138 139 /**** EXPORTS ****/ 140 141 /* Get the ID of the local context. This is transport dependent. */ 142 143 int vm_sockets_get_local_cid(void) 144 { 145 return transport->get_local_cid(); 146 } 147 EXPORT_SYMBOL_GPL(vm_sockets_get_local_cid); 148 149 /**** UTILS ****/ 150 151 /* Each bound VSocket is stored in the bind hash table and each connected 152 * VSocket is stored in the connected hash table. 153 * 154 * Unbound sockets are all put on the same list attached to the end of the hash 155 * table (vsock_unbound_sockets). Bound sockets are added to the hash table in 156 * the bucket that their local address hashes to (vsock_bound_sockets(addr) 157 * represents the list that addr hashes to). 158 * 159 * Specifically, we initialize the vsock_bind_table array to a size of 160 * VSOCK_HASH_SIZE + 1 so that vsock_bind_table[0] through 161 * vsock_bind_table[VSOCK_HASH_SIZE - 1] are for bound sockets and 162 * vsock_bind_table[VSOCK_HASH_SIZE] is for unbound sockets. The hash function 163 * mods with VSOCK_HASH_SIZE to ensure this. 164 */ 165 #define MAX_PORT_RETRIES 24 166 167 #define VSOCK_HASH(addr) ((addr)->svm_port % VSOCK_HASH_SIZE) 168 #define vsock_bound_sockets(addr) (&vsock_bind_table[VSOCK_HASH(addr)]) 169 #define vsock_unbound_sockets (&vsock_bind_table[VSOCK_HASH_SIZE]) 170 171 /* XXX This can probably be implemented in a better way. */ 172 #define VSOCK_CONN_HASH(src, dst) \ 173 (((src)->svm_cid ^ (dst)->svm_port) % VSOCK_HASH_SIZE) 174 #define vsock_connected_sockets(src, dst) \ 175 (&vsock_connected_table[VSOCK_CONN_HASH(src, dst)]) 176 #define vsock_connected_sockets_vsk(vsk) \ 177 vsock_connected_sockets(&(vsk)->remote_addr, &(vsk)->local_addr) 178 179 struct list_head vsock_bind_table[VSOCK_HASH_SIZE + 1]; 180 EXPORT_SYMBOL_GPL(vsock_bind_table); 181 struct list_head vsock_connected_table[VSOCK_HASH_SIZE]; 182 EXPORT_SYMBOL_GPL(vsock_connected_table); 183 DEFINE_SPINLOCK(vsock_table_lock); 184 EXPORT_SYMBOL_GPL(vsock_table_lock); 185 186 /* Autobind this socket to the local address if necessary. */ 187 static int vsock_auto_bind(struct vsock_sock *vsk) 188 { 189 struct sock *sk = sk_vsock(vsk); 190 struct sockaddr_vm local_addr; 191 192 if (vsock_addr_bound(&vsk->local_addr)) 193 return 0; 194 vsock_addr_init(&local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 195 return __vsock_bind(sk, &local_addr); 196 } 197 198 static void vsock_init_tables(void) 199 { 200 int i; 201 202 for (i = 0; i < ARRAY_SIZE(vsock_bind_table); i++) 203 INIT_LIST_HEAD(&vsock_bind_table[i]); 204 205 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) 206 INIT_LIST_HEAD(&vsock_connected_table[i]); 207 } 208 209 static void __vsock_insert_bound(struct list_head *list, 210 struct vsock_sock *vsk) 211 { 212 sock_hold(&vsk->sk); 213 list_add(&vsk->bound_table, list); 214 } 215 216 static void __vsock_insert_connected(struct list_head *list, 217 struct vsock_sock *vsk) 218 { 219 sock_hold(&vsk->sk); 220 list_add(&vsk->connected_table, list); 221 } 222 223 static void __vsock_remove_bound(struct vsock_sock *vsk) 224 { 225 list_del_init(&vsk->bound_table); 226 sock_put(&vsk->sk); 227 } 228 229 static void __vsock_remove_connected(struct vsock_sock *vsk) 230 { 231 list_del_init(&vsk->connected_table); 232 sock_put(&vsk->sk); 233 } 234 235 static struct sock *__vsock_find_bound_socket(struct sockaddr_vm *addr) 236 { 237 struct vsock_sock *vsk; 238 239 list_for_each_entry(vsk, vsock_bound_sockets(addr), bound_table) 240 if (addr->svm_port == vsk->local_addr.svm_port) 241 return sk_vsock(vsk); 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 __vsock_remove_bound(vsk); 284 spin_unlock_bh(&vsock_table_lock); 285 } 286 EXPORT_SYMBOL_GPL(vsock_remove_bound); 287 288 void vsock_remove_connected(struct vsock_sock *vsk) 289 { 290 spin_lock_bh(&vsock_table_lock); 291 __vsock_remove_connected(vsk); 292 spin_unlock_bh(&vsock_table_lock); 293 } 294 EXPORT_SYMBOL_GPL(vsock_remove_connected); 295 296 struct sock *vsock_find_bound_socket(struct sockaddr_vm *addr) 297 { 298 struct sock *sk; 299 300 spin_lock_bh(&vsock_table_lock); 301 sk = __vsock_find_bound_socket(addr); 302 if (sk) 303 sock_hold(sk); 304 305 spin_unlock_bh(&vsock_table_lock); 306 307 return sk; 308 } 309 EXPORT_SYMBOL_GPL(vsock_find_bound_socket); 310 311 struct sock *vsock_find_connected_socket(struct sockaddr_vm *src, 312 struct sockaddr_vm *dst) 313 { 314 struct sock *sk; 315 316 spin_lock_bh(&vsock_table_lock); 317 sk = __vsock_find_connected_socket(src, dst); 318 if (sk) 319 sock_hold(sk); 320 321 spin_unlock_bh(&vsock_table_lock); 322 323 return sk; 324 } 325 EXPORT_SYMBOL_GPL(vsock_find_connected_socket); 326 327 static bool vsock_in_bound_table(struct vsock_sock *vsk) 328 { 329 bool ret; 330 331 spin_lock_bh(&vsock_table_lock); 332 ret = __vsock_in_bound_table(vsk); 333 spin_unlock_bh(&vsock_table_lock); 334 335 return ret; 336 } 337 338 static bool vsock_in_connected_table(struct vsock_sock *vsk) 339 { 340 bool ret; 341 342 spin_lock_bh(&vsock_table_lock); 343 ret = __vsock_in_connected_table(vsk); 344 spin_unlock_bh(&vsock_table_lock); 345 346 return ret; 347 } 348 349 void vsock_remove_sock(struct vsock_sock *vsk) 350 { 351 if (vsock_in_bound_table(vsk)) 352 vsock_remove_bound(vsk); 353 354 if (vsock_in_connected_table(vsk)) 355 vsock_remove_connected(vsk); 356 } 357 EXPORT_SYMBOL_GPL(vsock_remove_sock); 358 359 void vsock_for_each_connected_socket(void (*fn)(struct sock *sk)) 360 { 361 int i; 362 363 spin_lock_bh(&vsock_table_lock); 364 365 for (i = 0; i < ARRAY_SIZE(vsock_connected_table); i++) { 366 struct vsock_sock *vsk; 367 list_for_each_entry(vsk, &vsock_connected_table[i], 368 connected_table) 369 fn(sk_vsock(vsk)); 370 } 371 372 spin_unlock_bh(&vsock_table_lock); 373 } 374 EXPORT_SYMBOL_GPL(vsock_for_each_connected_socket); 375 376 void vsock_add_pending(struct sock *listener, struct sock *pending) 377 { 378 struct vsock_sock *vlistener; 379 struct vsock_sock *vpending; 380 381 vlistener = vsock_sk(listener); 382 vpending = vsock_sk(pending); 383 384 sock_hold(pending); 385 sock_hold(listener); 386 list_add_tail(&vpending->pending_links, &vlistener->pending_links); 387 } 388 EXPORT_SYMBOL_GPL(vsock_add_pending); 389 390 void vsock_remove_pending(struct sock *listener, struct sock *pending) 391 { 392 struct vsock_sock *vpending = vsock_sk(pending); 393 394 list_del_init(&vpending->pending_links); 395 sock_put(listener); 396 sock_put(pending); 397 } 398 EXPORT_SYMBOL_GPL(vsock_remove_pending); 399 400 void vsock_enqueue_accept(struct sock *listener, struct sock *connected) 401 { 402 struct vsock_sock *vlistener; 403 struct vsock_sock *vconnected; 404 405 vlistener = vsock_sk(listener); 406 vconnected = vsock_sk(connected); 407 408 sock_hold(connected); 409 sock_hold(listener); 410 list_add_tail(&vconnected->accept_queue, &vlistener->accept_queue); 411 } 412 EXPORT_SYMBOL_GPL(vsock_enqueue_accept); 413 414 static struct sock *vsock_dequeue_accept(struct sock *listener) 415 { 416 struct vsock_sock *vlistener; 417 struct vsock_sock *vconnected; 418 419 vlistener = vsock_sk(listener); 420 421 if (list_empty(&vlistener->accept_queue)) 422 return NULL; 423 424 vconnected = list_entry(vlistener->accept_queue.next, 425 struct vsock_sock, accept_queue); 426 427 list_del_init(&vconnected->accept_queue); 428 sock_put(listener); 429 /* The caller will need a reference on the connected socket so we let 430 * it call sock_put(). 431 */ 432 433 return sk_vsock(vconnected); 434 } 435 436 static bool vsock_is_accept_queue_empty(struct sock *sk) 437 { 438 struct vsock_sock *vsk = vsock_sk(sk); 439 return list_empty(&vsk->accept_queue); 440 } 441 442 static bool vsock_is_pending(struct sock *sk) 443 { 444 struct vsock_sock *vsk = vsock_sk(sk); 445 return !list_empty(&vsk->pending_links); 446 } 447 448 static int vsock_send_shutdown(struct sock *sk, int mode) 449 { 450 return transport->shutdown(vsock_sk(sk), mode); 451 } 452 453 void vsock_pending_work(struct work_struct *work) 454 { 455 struct sock *sk; 456 struct sock *listener; 457 struct vsock_sock *vsk; 458 bool cleanup; 459 460 vsk = container_of(work, struct vsock_sock, dwork.work); 461 sk = sk_vsock(vsk); 462 listener = vsk->listener; 463 cleanup = true; 464 465 lock_sock(listener); 466 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 467 468 if (vsock_is_pending(sk)) { 469 vsock_remove_pending(listener, sk); 470 471 listener->sk_ack_backlog--; 472 } else if (!vsk->rejected) { 473 /* We are not on the pending list and accept() did not reject 474 * us, so we must have been accepted by our user process. We 475 * just need to drop our references to the sockets and be on 476 * our way. 477 */ 478 cleanup = false; 479 goto out; 480 } 481 482 /* We need to remove ourself from the global connected sockets list so 483 * incoming packets can't find this socket, and to reduce the reference 484 * count. 485 */ 486 if (vsock_in_connected_table(vsk)) 487 vsock_remove_connected(vsk); 488 489 sk->sk_state = TCP_CLOSE; 490 491 out: 492 release_sock(sk); 493 release_sock(listener); 494 if (cleanup) 495 sock_put(sk); 496 497 sock_put(sk); 498 sock_put(listener); 499 } 500 EXPORT_SYMBOL_GPL(vsock_pending_work); 501 502 /**** SOCKET OPERATIONS ****/ 503 504 static int __vsock_bind_stream(struct vsock_sock *vsk, 505 struct sockaddr_vm *addr) 506 { 507 static u32 port = LAST_RESERVED_PORT + 1; 508 struct sockaddr_vm new_addr; 509 510 vsock_addr_init(&new_addr, addr->svm_cid, addr->svm_port); 511 512 if (addr->svm_port == VMADDR_PORT_ANY) { 513 bool found = false; 514 unsigned int i; 515 516 for (i = 0; i < MAX_PORT_RETRIES; i++) { 517 if (port <= LAST_RESERVED_PORT) 518 port = LAST_RESERVED_PORT + 1; 519 520 new_addr.svm_port = port++; 521 522 if (!__vsock_find_bound_socket(&new_addr)) { 523 found = true; 524 break; 525 } 526 } 527 528 if (!found) 529 return -EADDRNOTAVAIL; 530 } else { 531 /* If port is in reserved range, ensure caller 532 * has necessary privileges. 533 */ 534 if (addr->svm_port <= LAST_RESERVED_PORT && 535 !capable(CAP_NET_BIND_SERVICE)) { 536 return -EACCES; 537 } 538 539 if (__vsock_find_bound_socket(&new_addr)) 540 return -EADDRINUSE; 541 } 542 543 vsock_addr_init(&vsk->local_addr, new_addr.svm_cid, new_addr.svm_port); 544 545 /* Remove stream sockets from the unbound list and add them to the hash 546 * table for easy lookup by its address. The unbound list is simply an 547 * extra entry at the end of the hash table, a trick used by AF_UNIX. 548 */ 549 __vsock_remove_bound(vsk); 550 __vsock_insert_bound(vsock_bound_sockets(&vsk->local_addr), vsk); 551 552 return 0; 553 } 554 555 static int __vsock_bind_dgram(struct vsock_sock *vsk, 556 struct sockaddr_vm *addr) 557 { 558 return transport->dgram_bind(vsk, addr); 559 } 560 561 static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr) 562 { 563 struct vsock_sock *vsk = vsock_sk(sk); 564 u32 cid; 565 int retval; 566 567 /* First ensure this socket isn't already bound. */ 568 if (vsock_addr_bound(&vsk->local_addr)) 569 return -EINVAL; 570 571 /* Now bind to the provided address or select appropriate values if 572 * none are provided (VMADDR_CID_ANY and VMADDR_PORT_ANY). Note that 573 * like AF_INET prevents binding to a non-local IP address (in most 574 * cases), we only allow binding to the local CID. 575 */ 576 cid = transport->get_local_cid(); 577 if (addr->svm_cid != cid && addr->svm_cid != VMADDR_CID_ANY) 578 return -EADDRNOTAVAIL; 579 580 switch (sk->sk_socket->type) { 581 case SOCK_STREAM: 582 spin_lock_bh(&vsock_table_lock); 583 retval = __vsock_bind_stream(vsk, addr); 584 spin_unlock_bh(&vsock_table_lock); 585 break; 586 587 case SOCK_DGRAM: 588 retval = __vsock_bind_dgram(vsk, addr); 589 break; 590 591 default: 592 retval = -EINVAL; 593 break; 594 } 595 596 return retval; 597 } 598 599 struct sock *__vsock_create(struct net *net, 600 struct socket *sock, 601 struct sock *parent, 602 gfp_t priority, 603 unsigned short type, 604 int kern) 605 { 606 struct sock *sk; 607 struct vsock_sock *psk; 608 struct vsock_sock *vsk; 609 610 sk = sk_alloc(net, AF_VSOCK, priority, &vsock_proto, kern); 611 if (!sk) 612 return NULL; 613 614 sock_init_data(sock, sk); 615 616 /* sk->sk_type is normally set in sock_init_data, but only if sock is 617 * non-NULL. We make sure that our sockets always have a type by 618 * setting it here if needed. 619 */ 620 if (!sock) 621 sk->sk_type = type; 622 623 vsk = vsock_sk(sk); 624 vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 625 vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); 626 627 sk->sk_destruct = vsock_sk_destruct; 628 sk->sk_backlog_rcv = vsock_queue_rcv_skb; 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. */ 673 674 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 */ 902 if (sk->sk_state == TCP_LISTEN 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 == TCP_ESTABLISHED) { 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 == TCP_CLOSE) { 954 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) 955 mask |= POLLOUT | POLLWRNORM; 956 957 } 958 959 release_sock(sk); 960 } 961 962 return mask; 963 } 964 965 static int vsock_dgram_sendmsg(struct socket *sock, struct msghdr *msg, 966 size_t len) 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); 982 983 err = vsock_auto_bind(vsk); 984 if (err) 985 goto out; 986 987 988 /* 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 1029 err = transport->dgram_enqueue(vsk, remote_addr, msg, len); 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 1060 err = vsock_auto_bind(vsk); 1061 if (err) 1062 goto out; 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 1078 static int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg, 1079 size_t len, int flags) 1080 { 1081 return transport->dgram_dequeue(vsock_sk(sock->sk), msg, len, flags); 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 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 1113 static void vsock_connect_timeout(struct work_struct *work) 1114 { 1115 struct sock *sk; 1116 struct vsock_sock *vsk; 1117 int cancel = 0; 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 == TCP_SYN_SENT && 1124 (sk->sk_shutdown != SHUTDOWN_MASK)) { 1125 sk->sk_state = TCP_CLOSE; 1126 sk->sk_err = ETIMEDOUT; 1127 sk->sk_error_report(sk); 1128 cancel = 1; 1129 } 1130 release_sock(sk); 1131 if (cancel) 1132 vsock_transport_cancel_pkt(vsk); 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: 1171 if ((sk->sk_state == TCP_LISTEN) || 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 1190 err = vsock_auto_bind(vsk); 1191 if (err) 1192 goto out; 1193 1194 sk->sk_state = TCP_SYN_SENT; 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 != TCP_ESTABLISHED && 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); 1237 sk->sk_state = TCP_CLOSE; 1238 sock->state = SS_UNCONNECTED; 1239 vsock_transport_cancel_pkt(vsk); 1240 goto out_wait; 1241 } else if (timeout == 0) { 1242 err = -ETIMEDOUT; 1243 sk->sk_state = TCP_CLOSE; 1244 sock->state = SS_UNCONNECTED; 1245 vsock_transport_cancel_pkt(vsk); 1246 goto out_wait; 1247 } 1248 1249 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1250 } 1251 1252 if (sk->sk_err) { 1253 err = -sk->sk_err; 1254 sk->sk_state = TCP_CLOSE; 1255 sock->state = SS_UNCONNECTED; 1256 } else { 1257 err = 0; 1258 } 1259 1260 out_wait: 1261 finish_wait(sk_sleep(sk), &wait); 1262 out: 1263 release_sock(sk); 1264 return err; 1265 } 1266 1267 static int vsock_accept(struct socket *sock, struct socket *newsock, int flags, 1268 bool kern) 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 1287 if (listener->sk_state != TCP_LISTEN) { 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); 1302 finish_wait(sk_sleep(listener), &wait); 1303 lock_sock(listener); 1304 1305 if (signal_pending(current)) { 1306 err = sock_intr_errno(timeout); 1307 goto out; 1308 } else if (timeout == 0) { 1309 err = -EAGAIN; 1310 goto out; 1311 } 1312 1313 prepare_to_wait(sk_sleep(listener), &wait, TASK_INTERRUPTIBLE); 1314 } 1315 finish_wait(sk_sleep(listener), &wait); 1316 1317 if (listener->sk_err) 1318 err = -listener->sk_err; 1319 1320 if (connected) { 1321 listener->sk_ack_backlog--; 1322 1323 lock_sock_nested(connected, SINGLE_DEPTH_NESTING); 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; 1335 } else { 1336 newsock->state = SS_CONNECTED; 1337 sock_graft(connected, newsock); 1338 } 1339 1340 release_sock(connected); 1341 sock_put(connected); 1342 } 1343 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; 1377 sk->sk_state = TCP_LISTEN; 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 1534 static int vsock_stream_sendmsg(struct socket *sock, struct msghdr *msg, 1535 size_t len) 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 DEFINE_WAIT_FUNC(wait, woken_wake_function); 1544 1545 sk = sock->sk; 1546 vsk = vsock_sk(sk); 1547 total_written = 0; 1548 err = 0; 1549 1550 if (msg->msg_flags & MSG_OOB) 1551 return -EOPNOTSUPP; 1552 1553 lock_sock(sk); 1554 1555 /* Callers should not provide a destination with stream sockets. */ 1556 if (msg->msg_namelen) { 1557 err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; 1558 goto out; 1559 } 1560 1561 /* Send data only if both sides are not shutdown in the direction. */ 1562 if (sk->sk_shutdown & SEND_SHUTDOWN || 1563 vsk->peer_shutdown & RCV_SHUTDOWN) { 1564 err = -EPIPE; 1565 goto out; 1566 } 1567 1568 if (sk->sk_state != TCP_ESTABLISHED || 1569 !vsock_addr_bound(&vsk->local_addr)) { 1570 err = -ENOTCONN; 1571 goto out; 1572 } 1573 1574 if (!vsock_addr_bound(&vsk->remote_addr)) { 1575 err = -EDESTADDRREQ; 1576 goto out; 1577 } 1578 1579 /* Wait for room in the produce queue to enqueue our user's data. */ 1580 timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); 1581 1582 err = transport->notify_send_init(vsk, &send_data); 1583 if (err < 0) 1584 goto out; 1585 1586 while (total_written < len) { 1587 ssize_t written; 1588 1589 add_wait_queue(sk_sleep(sk), &wait); 1590 while (vsock_stream_has_space(vsk) == 0 && 1591 sk->sk_err == 0 && 1592 !(sk->sk_shutdown & SEND_SHUTDOWN) && 1593 !(vsk->peer_shutdown & RCV_SHUTDOWN)) { 1594 1595 /* Don't wait for non-blocking sockets. */ 1596 if (timeout == 0) { 1597 err = -EAGAIN; 1598 remove_wait_queue(sk_sleep(sk), &wait); 1599 goto out_err; 1600 } 1601 1602 err = transport->notify_send_pre_block(vsk, &send_data); 1603 if (err < 0) { 1604 remove_wait_queue(sk_sleep(sk), &wait); 1605 goto out_err; 1606 } 1607 1608 release_sock(sk); 1609 timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); 1610 lock_sock(sk); 1611 if (signal_pending(current)) { 1612 err = sock_intr_errno(timeout); 1613 remove_wait_queue(sk_sleep(sk), &wait); 1614 goto out_err; 1615 } else if (timeout == 0) { 1616 err = -EAGAIN; 1617 remove_wait_queue(sk_sleep(sk), &wait); 1618 goto out_err; 1619 } 1620 } 1621 remove_wait_queue(sk_sleep(sk), &wait); 1622 1623 /* These checks occur both as part of and after the loop 1624 * conditional since we need to check before and after 1625 * sleeping. 1626 */ 1627 if (sk->sk_err) { 1628 err = -sk->sk_err; 1629 goto out_err; 1630 } else if ((sk->sk_shutdown & SEND_SHUTDOWN) || 1631 (vsk->peer_shutdown & RCV_SHUTDOWN)) { 1632 err = -EPIPE; 1633 goto out_err; 1634 } 1635 1636 err = transport->notify_send_pre_enqueue(vsk, &send_data); 1637 if (err < 0) 1638 goto out_err; 1639 1640 /* Note that enqueue will only write as many bytes as are free 1641 * in the produce queue, so we don't need to ensure len is 1642 * smaller than the queue size. It is the caller's 1643 * responsibility to check how many bytes we were able to send. 1644 */ 1645 1646 written = transport->stream_enqueue( 1647 vsk, msg, 1648 len - total_written); 1649 if (written < 0) { 1650 err = -ENOMEM; 1651 goto out_err; 1652 } 1653 1654 total_written += written; 1655 1656 err = transport->notify_send_post_enqueue( 1657 vsk, written, &send_data); 1658 if (err < 0) 1659 goto out_err; 1660 1661 } 1662 1663 out_err: 1664 if (total_written > 0) 1665 err = total_written; 1666 out: 1667 release_sock(sk); 1668 return err; 1669 } 1670 1671 1672 static int 1673 vsock_stream_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, 1674 int flags) 1675 { 1676 struct sock *sk; 1677 struct vsock_sock *vsk; 1678 int err; 1679 size_t target; 1680 ssize_t copied; 1681 long timeout; 1682 struct vsock_transport_recv_notify_data recv_data; 1683 1684 DEFINE_WAIT(wait); 1685 1686 sk = sock->sk; 1687 vsk = vsock_sk(sk); 1688 err = 0; 1689 1690 lock_sock(sk); 1691 1692 if (sk->sk_state != TCP_ESTABLISHED) { 1693 /* Recvmsg is supposed to return 0 if a peer performs an 1694 * orderly shutdown. Differentiate between that case and when a 1695 * peer has not connected or a local shutdown occured with the 1696 * SOCK_DONE flag. 1697 */ 1698 if (sock_flag(sk, SOCK_DONE)) 1699 err = 0; 1700 else 1701 err = -ENOTCONN; 1702 1703 goto out; 1704 } 1705 1706 if (flags & MSG_OOB) { 1707 err = -EOPNOTSUPP; 1708 goto out; 1709 } 1710 1711 /* We don't check peer_shutdown flag here since peer may actually shut 1712 * down, but there can be data in the queue that a local socket can 1713 * receive. 1714 */ 1715 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1716 err = 0; 1717 goto out; 1718 } 1719 1720 /* It is valid on Linux to pass in a zero-length receive buffer. This 1721 * is not an error. We may as well bail out now. 1722 */ 1723 if (!len) { 1724 err = 0; 1725 goto out; 1726 } 1727 1728 /* We must not copy less than target bytes into the user's buffer 1729 * before returning successfully, so we wait for the consume queue to 1730 * have that much data to consume before dequeueing. Note that this 1731 * makes it impossible to handle cases where target is greater than the 1732 * queue size. 1733 */ 1734 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); 1735 if (target >= transport->stream_rcvhiwat(vsk)) { 1736 err = -ENOMEM; 1737 goto out; 1738 } 1739 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); 1740 copied = 0; 1741 1742 err = transport->notify_recv_init(vsk, target, &recv_data); 1743 if (err < 0) 1744 goto out; 1745 1746 1747 while (1) { 1748 s64 ready; 1749 1750 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1751 ready = vsock_stream_has_data(vsk); 1752 1753 if (ready == 0) { 1754 if (sk->sk_err != 0 || 1755 (sk->sk_shutdown & RCV_SHUTDOWN) || 1756 (vsk->peer_shutdown & SEND_SHUTDOWN)) { 1757 finish_wait(sk_sleep(sk), &wait); 1758 break; 1759 } 1760 /* Don't wait for non-blocking sockets. */ 1761 if (timeout == 0) { 1762 err = -EAGAIN; 1763 finish_wait(sk_sleep(sk), &wait); 1764 break; 1765 } 1766 1767 err = transport->notify_recv_pre_block( 1768 vsk, target, &recv_data); 1769 if (err < 0) { 1770 finish_wait(sk_sleep(sk), &wait); 1771 break; 1772 } 1773 release_sock(sk); 1774 timeout = schedule_timeout(timeout); 1775 lock_sock(sk); 1776 1777 if (signal_pending(current)) { 1778 err = sock_intr_errno(timeout); 1779 finish_wait(sk_sleep(sk), &wait); 1780 break; 1781 } else if (timeout == 0) { 1782 err = -EAGAIN; 1783 finish_wait(sk_sleep(sk), &wait); 1784 break; 1785 } 1786 } else { 1787 ssize_t read; 1788 1789 finish_wait(sk_sleep(sk), &wait); 1790 1791 if (ready < 0) { 1792 /* Invalid queue pair content. XXX This should 1793 * be changed to a connection reset in a later 1794 * change. 1795 */ 1796 1797 err = -ENOMEM; 1798 goto out; 1799 } 1800 1801 err = transport->notify_recv_pre_dequeue( 1802 vsk, target, &recv_data); 1803 if (err < 0) 1804 break; 1805 1806 read = transport->stream_dequeue( 1807 vsk, msg, 1808 len - copied, flags); 1809 if (read < 0) { 1810 err = -ENOMEM; 1811 break; 1812 } 1813 1814 copied += read; 1815 1816 err = transport->notify_recv_post_dequeue( 1817 vsk, target, read, 1818 !(flags & MSG_PEEK), &recv_data); 1819 if (err < 0) 1820 goto out; 1821 1822 if (read >= target || flags & MSG_PEEK) 1823 break; 1824 1825 target -= read; 1826 } 1827 } 1828 1829 if (sk->sk_err) 1830 err = -sk->sk_err; 1831 else if (sk->sk_shutdown & RCV_SHUTDOWN) 1832 err = 0; 1833 1834 if (copied > 0) 1835 err = copied; 1836 1837 out: 1838 release_sock(sk); 1839 return err; 1840 } 1841 1842 static const struct proto_ops vsock_stream_ops = { 1843 .family = PF_VSOCK, 1844 .owner = THIS_MODULE, 1845 .release = vsock_release, 1846 .bind = vsock_bind, 1847 .connect = vsock_stream_connect, 1848 .socketpair = sock_no_socketpair, 1849 .accept = vsock_accept, 1850 .getname = vsock_getname, 1851 .poll = vsock_poll, 1852 .ioctl = sock_no_ioctl, 1853 .listen = vsock_listen, 1854 .shutdown = vsock_shutdown, 1855 .setsockopt = vsock_stream_setsockopt, 1856 .getsockopt = vsock_stream_getsockopt, 1857 .sendmsg = vsock_stream_sendmsg, 1858 .recvmsg = vsock_stream_recvmsg, 1859 .mmap = sock_no_mmap, 1860 .sendpage = sock_no_sendpage, 1861 }; 1862 1863 static int vsock_create(struct net *net, struct socket *sock, 1864 int protocol, int kern) 1865 { 1866 if (!sock) 1867 return -EINVAL; 1868 1869 if (protocol && protocol != PF_VSOCK) 1870 return -EPROTONOSUPPORT; 1871 1872 switch (sock->type) { 1873 case SOCK_DGRAM: 1874 sock->ops = &vsock_dgram_ops; 1875 break; 1876 case SOCK_STREAM: 1877 sock->ops = &vsock_stream_ops; 1878 break; 1879 default: 1880 return -ESOCKTNOSUPPORT; 1881 } 1882 1883 sock->state = SS_UNCONNECTED; 1884 1885 return __vsock_create(net, sock, NULL, GFP_KERNEL, 0, kern) ? 0 : -ENOMEM; 1886 } 1887 1888 static const struct net_proto_family vsock_family_ops = { 1889 .family = AF_VSOCK, 1890 .create = vsock_create, 1891 .owner = THIS_MODULE, 1892 }; 1893 1894 static long vsock_dev_do_ioctl(struct file *filp, 1895 unsigned int cmd, void __user *ptr) 1896 { 1897 u32 __user *p = ptr; 1898 int retval = 0; 1899 1900 switch (cmd) { 1901 case IOCTL_VM_SOCKETS_GET_LOCAL_CID: 1902 if (put_user(transport->get_local_cid(), p) != 0) 1903 retval = -EFAULT; 1904 break; 1905 1906 default: 1907 pr_err("Unknown ioctl %d\n", cmd); 1908 retval = -EINVAL; 1909 } 1910 1911 return retval; 1912 } 1913 1914 static long vsock_dev_ioctl(struct file *filp, 1915 unsigned int cmd, unsigned long arg) 1916 { 1917 return vsock_dev_do_ioctl(filp, cmd, (void __user *)arg); 1918 } 1919 1920 #ifdef CONFIG_COMPAT 1921 static long vsock_dev_compat_ioctl(struct file *filp, 1922 unsigned int cmd, unsigned long arg) 1923 { 1924 return vsock_dev_do_ioctl(filp, cmd, compat_ptr(arg)); 1925 } 1926 #endif 1927 1928 static const struct file_operations vsock_device_ops = { 1929 .owner = THIS_MODULE, 1930 .unlocked_ioctl = vsock_dev_ioctl, 1931 #ifdef CONFIG_COMPAT 1932 .compat_ioctl = vsock_dev_compat_ioctl, 1933 #endif 1934 .open = nonseekable_open, 1935 }; 1936 1937 static struct miscdevice vsock_device = { 1938 .name = "vsock", 1939 .fops = &vsock_device_ops, 1940 }; 1941 1942 int __vsock_core_init(const struct vsock_transport *t, struct module *owner) 1943 { 1944 int err = mutex_lock_interruptible(&vsock_register_mutex); 1945 1946 if (err) 1947 return err; 1948 1949 if (transport) { 1950 err = -EBUSY; 1951 goto err_busy; 1952 } 1953 1954 /* Transport must be the owner of the protocol so that it can't 1955 * unload while there are open sockets. 1956 */ 1957 vsock_proto.owner = owner; 1958 transport = t; 1959 1960 vsock_init_tables(); 1961 1962 vsock_device.minor = MISC_DYNAMIC_MINOR; 1963 err = misc_register(&vsock_device); 1964 if (err) { 1965 pr_err("Failed to register misc device\n"); 1966 goto err_reset_transport; 1967 } 1968 1969 err = proto_register(&vsock_proto, 1); /* we want our slab */ 1970 if (err) { 1971 pr_err("Cannot register vsock protocol\n"); 1972 goto err_deregister_misc; 1973 } 1974 1975 err = sock_register(&vsock_family_ops); 1976 if (err) { 1977 pr_err("could not register af_vsock (%d) address family: %d\n", 1978 AF_VSOCK, err); 1979 goto err_unregister_proto; 1980 } 1981 1982 mutex_unlock(&vsock_register_mutex); 1983 return 0; 1984 1985 err_unregister_proto: 1986 proto_unregister(&vsock_proto); 1987 err_deregister_misc: 1988 misc_deregister(&vsock_device); 1989 err_reset_transport: 1990 transport = NULL; 1991 err_busy: 1992 mutex_unlock(&vsock_register_mutex); 1993 return err; 1994 } 1995 EXPORT_SYMBOL_GPL(__vsock_core_init); 1996 1997 void vsock_core_exit(void) 1998 { 1999 mutex_lock(&vsock_register_mutex); 2000 2001 misc_deregister(&vsock_device); 2002 sock_unregister(AF_VSOCK); 2003 proto_unregister(&vsock_proto); 2004 2005 /* We do not want the assignment below re-ordered. */ 2006 mb(); 2007 transport = NULL; 2008 2009 mutex_unlock(&vsock_register_mutex); 2010 } 2011 EXPORT_SYMBOL_GPL(vsock_core_exit); 2012 2013 const struct vsock_transport *vsock_core_get_transport(void) 2014 { 2015 /* vsock_register_mutex not taken since only the transport uses this 2016 * function and only while registered. 2017 */ 2018 return transport; 2019 } 2020 EXPORT_SYMBOL_GPL(vsock_core_get_transport); 2021 2022 MODULE_AUTHOR("VMware, Inc."); 2023 MODULE_DESCRIPTION("VMware Virtual Socket Family"); 2024 MODULE_VERSION("1.0.2.0-k"); 2025 MODULE_LICENSE("GPL v2"); 2026