1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* AF_RXRPC implementation 3 * 4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/module.h> 11 #include <linux/kernel.h> 12 #include <linux/net.h> 13 #include <linux/slab.h> 14 #include <linux/skbuff.h> 15 #include <linux/random.h> 16 #include <linux/poll.h> 17 #include <linux/proc_fs.h> 18 #include <linux/key-type.h> 19 #include <net/net_namespace.h> 20 #include <net/sock.h> 21 #include <net/af_rxrpc.h> 22 #define CREATE_TRACE_POINTS 23 #include "ar-internal.h" 24 25 MODULE_DESCRIPTION("RxRPC network protocol"); 26 MODULE_AUTHOR("Red Hat, Inc."); 27 MODULE_LICENSE("GPL"); 28 MODULE_ALIAS_NETPROTO(PF_RXRPC); 29 30 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; 31 module_param_named(debug, rxrpc_debug, uint, 0644); 32 MODULE_PARM_DESC(debug, "RxRPC debugging mask"); 33 34 static struct proto rxrpc_proto; 35 static const struct proto_ops rxrpc_rpc_ops; 36 37 /* current debugging ID */ 38 atomic_t rxrpc_debug_id; 39 EXPORT_SYMBOL(rxrpc_debug_id); 40 41 /* count of skbs currently in use */ 42 atomic_t rxrpc_n_rx_skbs; 43 44 struct workqueue_struct *rxrpc_workqueue; 45 46 static void rxrpc_sock_destructor(struct sock *); 47 48 /* 49 * see if an RxRPC socket is currently writable 50 */ 51 static inline int rxrpc_writable(struct sock *sk) 52 { 53 return refcount_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; 54 } 55 56 /* 57 * wait for write bufferage to become available 58 */ 59 static void rxrpc_write_space(struct sock *sk) 60 { 61 _enter("%p", sk); 62 rcu_read_lock(); 63 if (rxrpc_writable(sk)) { 64 struct socket_wq *wq = rcu_dereference(sk->sk_wq); 65 66 if (skwq_has_sleeper(wq)) 67 wake_up_interruptible(&wq->wait); 68 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT); 69 } 70 rcu_read_unlock(); 71 } 72 73 /* 74 * validate an RxRPC address 75 */ 76 static int rxrpc_validate_address(struct rxrpc_sock *rx, 77 struct sockaddr_rxrpc *srx, 78 int len) 79 { 80 unsigned int tail; 81 82 if (len < sizeof(struct sockaddr_rxrpc)) 83 return -EINVAL; 84 85 if (srx->srx_family != AF_RXRPC) 86 return -EAFNOSUPPORT; 87 88 if (srx->transport_type != SOCK_DGRAM) 89 return -ESOCKTNOSUPPORT; 90 91 len -= offsetof(struct sockaddr_rxrpc, transport); 92 if (srx->transport_len < sizeof(sa_family_t) || 93 srx->transport_len > len) 94 return -EINVAL; 95 96 switch (srx->transport.family) { 97 case AF_INET: 98 if (rx->family != AF_INET && 99 rx->family != AF_INET6) 100 return -EAFNOSUPPORT; 101 if (srx->transport_len < sizeof(struct sockaddr_in)) 102 return -EINVAL; 103 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); 104 break; 105 106 #ifdef CONFIG_AF_RXRPC_IPV6 107 case AF_INET6: 108 if (rx->family != AF_INET6) 109 return -EAFNOSUPPORT; 110 if (srx->transport_len < sizeof(struct sockaddr_in6)) 111 return -EINVAL; 112 tail = offsetof(struct sockaddr_rxrpc, transport) + 113 sizeof(struct sockaddr_in6); 114 break; 115 #endif 116 117 default: 118 return -EAFNOSUPPORT; 119 } 120 121 if (tail < len) 122 memset((void *)srx + tail, 0, len - tail); 123 _debug("INET: %pISp", &srx->transport); 124 return 0; 125 } 126 127 /* 128 * bind a local address to an RxRPC socket 129 */ 130 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) 131 { 132 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; 133 struct rxrpc_local *local; 134 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 135 u16 service_id; 136 int ret; 137 138 _enter("%p,%p,%d", rx, saddr, len); 139 140 ret = rxrpc_validate_address(rx, srx, len); 141 if (ret < 0) 142 goto error; 143 service_id = srx->srx_service; 144 145 lock_sock(&rx->sk); 146 147 switch (rx->sk.sk_state) { 148 case RXRPC_UNBOUND: 149 rx->srx = *srx; 150 local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx); 151 if (IS_ERR(local)) { 152 ret = PTR_ERR(local); 153 goto error_unlock; 154 } 155 156 if (service_id) { 157 write_lock(&local->services_lock); 158 if (local->service) 159 goto service_in_use; 160 rx->local = local; 161 local->service = rx; 162 write_unlock(&local->services_lock); 163 164 rx->sk.sk_state = RXRPC_SERVER_BOUND; 165 } else { 166 rx->local = local; 167 rx->sk.sk_state = RXRPC_CLIENT_BOUND; 168 } 169 break; 170 171 case RXRPC_SERVER_BOUND: 172 ret = -EINVAL; 173 if (service_id == 0) 174 goto error_unlock; 175 ret = -EADDRINUSE; 176 if (service_id == rx->srx.srx_service) 177 goto error_unlock; 178 ret = -EINVAL; 179 srx->srx_service = rx->srx.srx_service; 180 if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0) 181 goto error_unlock; 182 rx->second_service = service_id; 183 rx->sk.sk_state = RXRPC_SERVER_BOUND2; 184 break; 185 186 default: 187 ret = -EINVAL; 188 goto error_unlock; 189 } 190 191 release_sock(&rx->sk); 192 _leave(" = 0"); 193 return 0; 194 195 service_in_use: 196 write_unlock(&local->services_lock); 197 rxrpc_unuse_local(local, rxrpc_local_unuse_bind); 198 rxrpc_put_local(local, rxrpc_local_put_bind); 199 ret = -EADDRINUSE; 200 error_unlock: 201 release_sock(&rx->sk); 202 error: 203 _leave(" = %d", ret); 204 return ret; 205 } 206 207 /* 208 * set the number of pending calls permitted on a listening socket 209 */ 210 static int rxrpc_listen(struct socket *sock, int backlog) 211 { 212 struct sock *sk = sock->sk; 213 struct rxrpc_sock *rx = rxrpc_sk(sk); 214 unsigned int max, old; 215 int ret; 216 217 _enter("%p,%d", rx, backlog); 218 219 lock_sock(&rx->sk); 220 221 switch (rx->sk.sk_state) { 222 case RXRPC_UNBOUND: 223 ret = -EADDRNOTAVAIL; 224 break; 225 case RXRPC_SERVER_BOUND: 226 case RXRPC_SERVER_BOUND2: 227 ASSERT(rx->local != NULL); 228 max = READ_ONCE(rxrpc_max_backlog); 229 ret = -EINVAL; 230 if (backlog == INT_MAX) 231 backlog = max; 232 else if (backlog < 0 || backlog > max) 233 break; 234 old = sk->sk_max_ack_backlog; 235 sk->sk_max_ack_backlog = backlog; 236 ret = rxrpc_service_prealloc(rx, GFP_KERNEL); 237 if (ret == 0) 238 rx->sk.sk_state = RXRPC_SERVER_LISTENING; 239 else 240 sk->sk_max_ack_backlog = old; 241 break; 242 case RXRPC_SERVER_LISTENING: 243 if (backlog == 0) { 244 rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED; 245 sk->sk_max_ack_backlog = 0; 246 rxrpc_discard_prealloc(rx); 247 ret = 0; 248 break; 249 } 250 fallthrough; 251 default: 252 ret = -EBUSY; 253 break; 254 } 255 256 release_sock(&rx->sk); 257 _leave(" = %d", ret); 258 return ret; 259 } 260 261 /** 262 * rxrpc_kernel_lookup_peer - Obtain remote transport endpoint for an address 263 * @sock: The socket through which it will be accessed 264 * @srx: The network address 265 * @gfp: Allocation flags 266 * 267 * Lookup or create a remote transport endpoint record for the specified 268 * address. 269 * 270 * Return: The peer record found with a reference, %NULL if no record is found 271 * or a negative error code if the address is invalid or unsupported. 272 */ 273 struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock, 274 struct sockaddr_rxrpc *srx, gfp_t gfp) 275 { 276 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 277 int ret; 278 279 ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); 280 if (ret < 0) 281 return ERR_PTR(ret); 282 283 return rxrpc_lookup_peer(rx->local, srx, gfp); 284 } 285 EXPORT_SYMBOL(rxrpc_kernel_lookup_peer); 286 287 /** 288 * rxrpc_kernel_get_peer - Get a reference on a peer 289 * @peer: The peer to get a reference on (may be NULL). 290 * 291 * Get a reference for a remote peer record (if not NULL). 292 * 293 * Return: The @peer argument. 294 */ 295 struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer) 296 { 297 return peer ? rxrpc_get_peer(peer, rxrpc_peer_get_application) : NULL; 298 } 299 EXPORT_SYMBOL(rxrpc_kernel_get_peer); 300 301 /** 302 * rxrpc_kernel_put_peer - Allow a kernel app to drop a peer reference 303 * @peer: The peer to drop a ref on 304 * 305 * Drop a reference on a peer record. 306 */ 307 void rxrpc_kernel_put_peer(struct rxrpc_peer *peer) 308 { 309 rxrpc_put_peer(peer, rxrpc_peer_put_application); 310 } 311 EXPORT_SYMBOL(rxrpc_kernel_put_peer); 312 313 /** 314 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call 315 * @sock: The socket on which to make the call 316 * @peer: The peer to contact 317 * @key: The security context to use (defaults to socket setting) 318 * @user_call_ID: The ID to use 319 * @tx_total_len: Total length of data to transmit during the call (or -1) 320 * @hard_timeout: The maximum lifespan of the call in sec 321 * @gfp: The allocation constraints 322 * @notify_rx: Where to send notifications instead of socket queue 323 * @service_id: The ID of the service to contact 324 * @upgrade: Request service upgrade for call 325 * @interruptibility: The call is interruptible, or can be canceled. 326 * @debug_id: The debug ID for tracing to be assigned to the call 327 * 328 * Allow a kernel service to begin a call on the nominated socket. This just 329 * sets up all the internal tracking structures and allocates connection and 330 * call IDs as appropriate. 331 * 332 * The default socket destination address and security may be overridden by 333 * supplying @srx and @key. 334 * 335 * Return: The new call or an error code. 336 */ 337 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, 338 struct rxrpc_peer *peer, 339 struct key *key, 340 unsigned long user_call_ID, 341 s64 tx_total_len, 342 u32 hard_timeout, 343 gfp_t gfp, 344 rxrpc_notify_rx_t notify_rx, 345 u16 service_id, 346 bool upgrade, 347 enum rxrpc_interruptibility interruptibility, 348 unsigned int debug_id) 349 { 350 struct rxrpc_conn_parameters cp; 351 struct rxrpc_call_params p; 352 struct rxrpc_call *call; 353 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 354 355 _enter(",,%x,%lx", key_serial(key), user_call_ID); 356 357 if (WARN_ON_ONCE(peer->local != rx->local)) 358 return ERR_PTR(-EIO); 359 360 lock_sock(&rx->sk); 361 362 if (!key) 363 key = rx->key; 364 if (key && !key->payload.data[0]) 365 key = NULL; /* a no-security key */ 366 367 memset(&p, 0, sizeof(p)); 368 p.user_call_ID = user_call_ID; 369 p.tx_total_len = tx_total_len; 370 p.interruptibility = interruptibility; 371 p.kernel = true; 372 p.timeouts.hard = hard_timeout; 373 374 memset(&cp, 0, sizeof(cp)); 375 cp.local = rx->local; 376 cp.peer = peer; 377 cp.key = key; 378 cp.security_level = rx->min_sec_level; 379 cp.exclusive = false; 380 cp.upgrade = upgrade; 381 cp.service_id = service_id; 382 call = rxrpc_new_client_call(rx, &cp, &p, gfp, debug_id); 383 /* The socket has been unlocked. */ 384 if (!IS_ERR(call)) { 385 call->notify_rx = notify_rx; 386 mutex_unlock(&call->user_mutex); 387 } 388 389 _leave(" = %p", call); 390 return call; 391 } 392 EXPORT_SYMBOL(rxrpc_kernel_begin_call); 393 394 /* 395 * Dummy function used to stop the notifier talking to recvmsg(). 396 */ 397 static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall, 398 unsigned long call_user_ID) 399 { 400 } 401 402 /** 403 * rxrpc_kernel_shutdown_call - Allow a kernel service to shut down a call it was using 404 * @sock: The socket the call is on 405 * @call: The call to end 406 * 407 * Allow a kernel service to shut down a call it was using. The call must be 408 * complete before this is called (the call should be aborted if necessary). 409 */ 410 void rxrpc_kernel_shutdown_call(struct socket *sock, struct rxrpc_call *call) 411 { 412 _enter("%d{%d}", call->debug_id, refcount_read(&call->ref)); 413 414 mutex_lock(&call->user_mutex); 415 if (!test_bit(RXRPC_CALL_RELEASED, &call->flags)) { 416 rxrpc_release_call(rxrpc_sk(sock->sk), call); 417 418 /* Make sure we're not going to call back into a kernel service */ 419 if (call->notify_rx) { 420 spin_lock_irq(&call->notify_lock); 421 call->notify_rx = rxrpc_dummy_notify_rx; 422 spin_unlock_irq(&call->notify_lock); 423 } 424 } 425 mutex_unlock(&call->user_mutex); 426 } 427 EXPORT_SYMBOL(rxrpc_kernel_shutdown_call); 428 429 /** 430 * rxrpc_kernel_put_call - Release a reference to a call 431 * @sock: The socket the call is on 432 * @call: The call to put 433 * 434 * Drop the application's ref on an rxrpc call. 435 */ 436 void rxrpc_kernel_put_call(struct socket *sock, struct rxrpc_call *call) 437 { 438 rxrpc_put_call(call, rxrpc_call_put_kernel); 439 } 440 EXPORT_SYMBOL(rxrpc_kernel_put_call); 441 442 /** 443 * rxrpc_kernel_check_life - Check to see whether a call is still alive 444 * @sock: The socket the call is on 445 * @call: The call to check 446 * 447 * Allow a kernel service to find out whether a call is still alive - whether 448 * it has completed successfully and all received data has been consumed. 449 * 450 * Return: %true if the call is still ongoing and %false if it has completed. 451 */ 452 bool rxrpc_kernel_check_life(const struct socket *sock, 453 const struct rxrpc_call *call) 454 { 455 if (!rxrpc_call_is_complete(call)) 456 return true; 457 if (call->completion != RXRPC_CALL_SUCCEEDED) 458 return false; 459 return !skb_queue_empty(&call->recvmsg_queue); 460 } 461 EXPORT_SYMBOL(rxrpc_kernel_check_life); 462 463 /** 464 * rxrpc_kernel_set_notifications - Set table of callback operations 465 * @sock: The socket to install table upon 466 * @app_ops: Callback operation table to set 467 * 468 * Allow a kernel service to set a table of event notifications on a socket. 469 */ 470 void rxrpc_kernel_set_notifications(struct socket *sock, 471 const struct rxrpc_kernel_ops *app_ops) 472 { 473 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 474 475 rx->app_ops = app_ops; 476 } 477 EXPORT_SYMBOL(rxrpc_kernel_set_notifications); 478 479 /* 480 * connect an RxRPC socket 481 * - this just targets it at a specific destination; no actual connection 482 * negotiation takes place 483 */ 484 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, 485 int addr_len, int flags) 486 { 487 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; 488 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 489 int ret; 490 491 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); 492 493 ret = rxrpc_validate_address(rx, srx, addr_len); 494 if (ret < 0) { 495 _leave(" = %d [bad addr]", ret); 496 return ret; 497 } 498 499 lock_sock(&rx->sk); 500 501 ret = -EISCONN; 502 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) 503 goto error; 504 505 switch (rx->sk.sk_state) { 506 case RXRPC_UNBOUND: 507 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; 508 break; 509 case RXRPC_CLIENT_UNBOUND: 510 case RXRPC_CLIENT_BOUND: 511 break; 512 default: 513 ret = -EBUSY; 514 goto error; 515 } 516 517 rx->connect_srx = *srx; 518 set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); 519 ret = 0; 520 521 error: 522 release_sock(&rx->sk); 523 return ret; 524 } 525 526 /* 527 * send a message through an RxRPC socket 528 * - in a client this does a number of things: 529 * - finds/sets up a connection for the security specified (if any) 530 * - initiates a call (ID in control data) 531 * - ends the request phase of a call (if MSG_MORE is not set) 532 * - sends a call data packet 533 * - may send an abort (abort code in control data) 534 */ 535 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) 536 { 537 struct rxrpc_local *local; 538 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 539 int ret; 540 541 _enter(",{%d},,%zu", rx->sk.sk_state, len); 542 543 if (m->msg_flags & MSG_OOB) 544 return -EOPNOTSUPP; 545 546 if (m->msg_name) { 547 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); 548 if (ret < 0) { 549 _leave(" = %d [bad addr]", ret); 550 return ret; 551 } 552 } 553 554 lock_sock(&rx->sk); 555 556 switch (rx->sk.sk_state) { 557 case RXRPC_UNBOUND: 558 case RXRPC_CLIENT_UNBOUND: 559 rx->srx.srx_family = AF_RXRPC; 560 rx->srx.srx_service = 0; 561 rx->srx.transport_type = SOCK_DGRAM; 562 rx->srx.transport.family = rx->family; 563 switch (rx->family) { 564 case AF_INET: 565 rx->srx.transport_len = sizeof(struct sockaddr_in); 566 break; 567 #ifdef CONFIG_AF_RXRPC_IPV6 568 case AF_INET6: 569 rx->srx.transport_len = sizeof(struct sockaddr_in6); 570 break; 571 #endif 572 default: 573 ret = -EAFNOSUPPORT; 574 goto error_unlock; 575 } 576 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx); 577 if (IS_ERR(local)) { 578 ret = PTR_ERR(local); 579 goto error_unlock; 580 } 581 582 rx->local = local; 583 rx->sk.sk_state = RXRPC_CLIENT_BOUND; 584 fallthrough; 585 586 case RXRPC_CLIENT_BOUND: 587 if (!m->msg_name && 588 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { 589 m->msg_name = &rx->connect_srx; 590 m->msg_namelen = sizeof(rx->connect_srx); 591 } 592 fallthrough; 593 case RXRPC_SERVER_BOUND: 594 case RXRPC_SERVER_LISTENING: 595 if (m->msg_flags & MSG_OOB) 596 ret = rxrpc_sendmsg_oob(rx, m, len); 597 else 598 ret = rxrpc_do_sendmsg(rx, m, len); 599 /* The socket has been unlocked */ 600 goto out; 601 default: 602 ret = -EINVAL; 603 goto error_unlock; 604 } 605 606 error_unlock: 607 release_sock(&rx->sk); 608 out: 609 _leave(" = %d", ret); 610 return ret; 611 } 612 613 int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val) 614 { 615 if (sk->sk_state != RXRPC_UNBOUND) 616 return -EISCONN; 617 if (val > RXRPC_SECURITY_MAX) 618 return -EINVAL; 619 lock_sock(sk); 620 rxrpc_sk(sk)->min_sec_level = val; 621 release_sock(sk); 622 return 0; 623 } 624 EXPORT_SYMBOL(rxrpc_sock_set_min_security_level); 625 626 /* 627 * set RxRPC socket options 628 */ 629 static int rxrpc_setsockopt(struct socket *sock, int level, int optname, 630 sockptr_t optval, unsigned int optlen) 631 { 632 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 633 unsigned int min_sec_level, val; 634 u16 service_upgrade[2]; 635 int ret; 636 637 _enter(",%d,%d,,%d", level, optname, optlen); 638 639 lock_sock(&rx->sk); 640 ret = -EOPNOTSUPP; 641 642 if (level == SOL_RXRPC) { 643 switch (optname) { 644 case RXRPC_EXCLUSIVE_CONNECTION: 645 ret = -EINVAL; 646 if (optlen != 0) 647 goto error; 648 ret = -EISCONN; 649 if (rx->sk.sk_state != RXRPC_UNBOUND) 650 goto error; 651 rx->exclusive = true; 652 goto success; 653 654 case RXRPC_SECURITY_KEY: 655 ret = -EINVAL; 656 if (rx->key) 657 goto error; 658 ret = -EISCONN; 659 if (rx->sk.sk_state != RXRPC_UNBOUND) 660 goto error; 661 ret = rxrpc_request_key(rx, optval, optlen); 662 goto error; 663 664 case RXRPC_SECURITY_KEYRING: 665 ret = -EINVAL; 666 if (rx->key) 667 goto error; 668 ret = -EISCONN; 669 if (rx->sk.sk_state != RXRPC_UNBOUND) 670 goto error; 671 ret = rxrpc_server_keyring(rx, optval, optlen); 672 goto error; 673 674 case RXRPC_MIN_SECURITY_LEVEL: 675 ret = -EINVAL; 676 if (optlen != sizeof(unsigned int)) 677 goto error; 678 ret = -EISCONN; 679 if (rx->sk.sk_state != RXRPC_UNBOUND) 680 goto error; 681 ret = copy_safe_from_sockptr(&min_sec_level, 682 sizeof(min_sec_level), 683 optval, optlen); 684 if (ret) 685 goto error; 686 ret = -EINVAL; 687 if (min_sec_level > RXRPC_SECURITY_MAX) 688 goto error; 689 rx->min_sec_level = min_sec_level; 690 goto success; 691 692 case RXRPC_UPGRADEABLE_SERVICE: 693 ret = -EINVAL; 694 if (optlen != sizeof(service_upgrade) || 695 rx->service_upgrade.from != 0) 696 goto error; 697 ret = -EISCONN; 698 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2) 699 goto error; 700 ret = -EFAULT; 701 if (copy_from_sockptr(service_upgrade, optval, 702 sizeof(service_upgrade)) != 0) 703 goto error; 704 ret = -EINVAL; 705 if ((service_upgrade[0] != rx->srx.srx_service || 706 service_upgrade[1] != rx->second_service) && 707 (service_upgrade[0] != rx->second_service || 708 service_upgrade[1] != rx->srx.srx_service)) 709 goto error; 710 rx->service_upgrade.from = service_upgrade[0]; 711 rx->service_upgrade.to = service_upgrade[1]; 712 goto success; 713 714 case RXRPC_MANAGE_RESPONSE: 715 ret = -EINVAL; 716 if (optlen != sizeof(unsigned int)) 717 goto error; 718 ret = -EISCONN; 719 if (rx->sk.sk_state != RXRPC_UNBOUND) 720 goto error; 721 ret = copy_safe_from_sockptr(&val, sizeof(val), 722 optval, optlen); 723 if (ret) 724 goto error; 725 ret = -EINVAL; 726 if (val > 1) 727 goto error; 728 if (val) 729 set_bit(RXRPC_SOCK_MANAGE_RESPONSE, &rx->flags); 730 else 731 clear_bit(RXRPC_SOCK_MANAGE_RESPONSE, &rx->flags); 732 goto success; 733 734 default: 735 break; 736 } 737 } 738 739 success: 740 ret = 0; 741 error: 742 release_sock(&rx->sk); 743 return ret; 744 } 745 746 /* 747 * Get socket options. 748 */ 749 static int rxrpc_getsockopt(struct socket *sock, int level, int optname, 750 char __user *optval, int __user *_optlen) 751 { 752 int optlen; 753 754 if (level != SOL_RXRPC) 755 return -EOPNOTSUPP; 756 757 if (get_user(optlen, _optlen)) 758 return -EFAULT; 759 760 switch (optname) { 761 case RXRPC_SUPPORTED_CMSG: 762 if (optlen < sizeof(int)) 763 return -ETOOSMALL; 764 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) || 765 put_user(sizeof(int), _optlen)) 766 return -EFAULT; 767 return 0; 768 769 default: 770 return -EOPNOTSUPP; 771 } 772 } 773 774 /* 775 * permit an RxRPC socket to be polled 776 */ 777 static __poll_t rxrpc_poll(struct file *file, struct socket *sock, 778 poll_table *wait) 779 { 780 struct sock *sk = sock->sk; 781 struct rxrpc_sock *rx = rxrpc_sk(sk); 782 __poll_t mask; 783 784 sock_poll_wait(file, sock, wait); 785 mask = 0; 786 787 /* the socket is readable if there are any messages waiting on the Rx 788 * queue */ 789 if (!list_empty(&rx->recvmsg_q)) 790 mask |= EPOLLIN | EPOLLRDNORM; 791 792 /* the socket is writable if there is space to add new data to the 793 * socket; there is no guarantee that any particular call in progress 794 * on the socket may have space in the Tx ACK window */ 795 if (rxrpc_writable(sk)) 796 mask |= EPOLLOUT | EPOLLWRNORM; 797 798 return mask; 799 } 800 801 /* 802 * create an RxRPC socket 803 */ 804 static int rxrpc_create(struct net *net, struct socket *sock, int protocol, 805 int kern) 806 { 807 struct rxrpc_net *rxnet; 808 struct rxrpc_sock *rx; 809 struct sock *sk; 810 811 _enter("%p,%d", sock, protocol); 812 813 /* we support transport protocol UDP/UDP6 only */ 814 if (protocol != PF_INET && 815 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6) 816 return -EPROTONOSUPPORT; 817 818 if (sock->type != SOCK_DGRAM) 819 return -ESOCKTNOSUPPORT; 820 821 sock->ops = &rxrpc_rpc_ops; 822 sock->state = SS_UNCONNECTED; 823 824 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); 825 if (!sk) 826 return -ENOMEM; 827 828 sock_init_data(sock, sk); 829 sock_set_flag(sk, SOCK_RCU_FREE); 830 sk->sk_state = RXRPC_UNBOUND; 831 sk->sk_write_space = rxrpc_write_space; 832 sk->sk_max_ack_backlog = 0; 833 sk->sk_destruct = rxrpc_sock_destructor; 834 835 rx = rxrpc_sk(sk); 836 rx->family = protocol; 837 rx->calls = RB_ROOT; 838 839 spin_lock_init(&rx->incoming_lock); 840 skb_queue_head_init(&rx->recvmsg_oobq); 841 rx->pending_oobq = RB_ROOT; 842 INIT_LIST_HEAD(&rx->sock_calls); 843 INIT_LIST_HEAD(&rx->to_be_accepted); 844 INIT_LIST_HEAD(&rx->recvmsg_q); 845 spin_lock_init(&rx->recvmsg_lock); 846 rwlock_init(&rx->call_lock); 847 memset(&rx->srx, 0, sizeof(rx->srx)); 848 849 rxnet = rxrpc_net(sock_net(&rx->sk)); 850 timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1); 851 852 _leave(" = 0 [%p]", rx); 853 return 0; 854 } 855 856 /* 857 * Kill all the calls on a socket and shut it down. 858 */ 859 static int rxrpc_shutdown(struct socket *sock, int flags) 860 { 861 struct sock *sk = sock->sk; 862 struct rxrpc_sock *rx = rxrpc_sk(sk); 863 int ret = 0; 864 865 _enter("%p,%d", sk, flags); 866 867 if (flags != SHUT_RDWR) 868 return -EOPNOTSUPP; 869 if (sk->sk_state == RXRPC_CLOSE) 870 return -ESHUTDOWN; 871 872 lock_sock(sk); 873 874 if (sk->sk_state < RXRPC_CLOSE) { 875 spin_lock_irq(&rx->recvmsg_lock); 876 sk->sk_state = RXRPC_CLOSE; 877 sk->sk_shutdown = SHUTDOWN_MASK; 878 spin_unlock_irq(&rx->recvmsg_lock); 879 } else { 880 ret = -ESHUTDOWN; 881 } 882 883 rxrpc_discard_prealloc(rx); 884 885 release_sock(sk); 886 return ret; 887 } 888 889 /* 890 * Purge the out-of-band queue. 891 */ 892 static void rxrpc_purge_oob_queue(struct sock *sk) 893 { 894 struct rxrpc_sock *rx = rxrpc_sk(sk); 895 struct sk_buff *skb; 896 897 while ((skb = skb_dequeue(&rx->recvmsg_oobq))) 898 rxrpc_kernel_free_oob(skb); 899 while (!RB_EMPTY_ROOT(&rx->pending_oobq)) { 900 skb = rb_entry(rx->pending_oobq.rb_node, struct sk_buff, rbnode); 901 rb_erase(&skb->rbnode, &rx->pending_oobq); 902 rxrpc_kernel_free_oob(skb); 903 } 904 } 905 906 /* 907 * RxRPC socket destructor 908 */ 909 static void rxrpc_sock_destructor(struct sock *sk) 910 { 911 _enter("%p", sk); 912 913 rxrpc_purge_oob_queue(sk); 914 rxrpc_purge_queue(&sk->sk_receive_queue); 915 916 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 917 WARN_ON(!sk_unhashed(sk)); 918 WARN_ON(sk->sk_socket); 919 920 if (!sock_flag(sk, SOCK_DEAD)) { 921 printk("Attempt to release alive rxrpc socket: %p\n", sk); 922 return; 923 } 924 } 925 926 /* 927 * release an RxRPC socket 928 */ 929 static int rxrpc_release_sock(struct sock *sk) 930 { 931 struct rxrpc_sock *rx = rxrpc_sk(sk); 932 933 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt)); 934 935 /* declare the socket closed for business */ 936 sock_orphan(sk); 937 sk->sk_shutdown = SHUTDOWN_MASK; 938 939 /* We want to kill off all connections from a service socket 940 * as fast as possible because we can't share these; client 941 * sockets, on the other hand, can share an endpoint. 942 */ 943 switch (sk->sk_state) { 944 case RXRPC_SERVER_BOUND: 945 case RXRPC_SERVER_BOUND2: 946 case RXRPC_SERVER_LISTENING: 947 case RXRPC_SERVER_LISTEN_DISABLED: 948 rx->local->service_closed = true; 949 break; 950 } 951 952 spin_lock_irq(&rx->recvmsg_lock); 953 sk->sk_state = RXRPC_CLOSE; 954 spin_unlock_irq(&rx->recvmsg_lock); 955 956 if (rx->local && rx->local->service == rx) { 957 write_lock(&rx->local->services_lock); 958 rx->local->service = NULL; 959 write_unlock(&rx->local->services_lock); 960 } 961 962 /* try to flush out this socket */ 963 rxrpc_discard_prealloc(rx); 964 rxrpc_release_calls_on_socket(rx); 965 flush_workqueue(rxrpc_workqueue); 966 rxrpc_purge_oob_queue(sk); 967 rxrpc_purge_queue(&sk->sk_receive_queue); 968 969 rxrpc_unuse_local(rx->local, rxrpc_local_unuse_release_sock); 970 rxrpc_put_local(rx->local, rxrpc_local_put_release_sock); 971 rx->local = NULL; 972 key_put(rx->key); 973 rx->key = NULL; 974 key_put(rx->securities); 975 rx->securities = NULL; 976 sock_put(sk); 977 978 _leave(" = 0"); 979 return 0; 980 } 981 982 /* 983 * release an RxRPC BSD socket on close() or equivalent 984 */ 985 static int rxrpc_release(struct socket *sock) 986 { 987 struct sock *sk = sock->sk; 988 989 _enter("%p{%p}", sock, sk); 990 991 if (!sk) 992 return 0; 993 994 sock->sk = NULL; 995 996 return rxrpc_release_sock(sk); 997 } 998 999 /* 1000 * RxRPC network protocol 1001 */ 1002 static const struct proto_ops rxrpc_rpc_ops = { 1003 .family = PF_RXRPC, 1004 .owner = THIS_MODULE, 1005 .release = rxrpc_release, 1006 .bind = rxrpc_bind, 1007 .connect = rxrpc_connect, 1008 .socketpair = sock_no_socketpair, 1009 .accept = sock_no_accept, 1010 .getname = sock_no_getname, 1011 .poll = rxrpc_poll, 1012 .ioctl = sock_no_ioctl, 1013 .listen = rxrpc_listen, 1014 .shutdown = rxrpc_shutdown, 1015 .setsockopt = rxrpc_setsockopt, 1016 .getsockopt = rxrpc_getsockopt, 1017 .sendmsg = rxrpc_sendmsg, 1018 .recvmsg = rxrpc_recvmsg, 1019 .mmap = sock_no_mmap, 1020 }; 1021 1022 static struct proto rxrpc_proto = { 1023 .name = "RXRPC", 1024 .owner = THIS_MODULE, 1025 .obj_size = sizeof(struct rxrpc_sock), 1026 .max_header = sizeof(struct rxrpc_wire_header), 1027 }; 1028 1029 static const struct net_proto_family rxrpc_family_ops = { 1030 .family = PF_RXRPC, 1031 .create = rxrpc_create, 1032 .owner = THIS_MODULE, 1033 }; 1034 1035 /* 1036 * initialise and register the RxRPC protocol 1037 */ 1038 static int __init af_rxrpc_init(void) 1039 { 1040 int ret = -1; 1041 1042 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb)); 1043 1044 ret = -ENOMEM; 1045 rxrpc_gen_version_string(); 1046 rxrpc_call_jar = kmem_cache_create( 1047 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, 1048 SLAB_HWCACHE_ALIGN, NULL); 1049 if (!rxrpc_call_jar) { 1050 pr_notice("Failed to allocate call jar\n"); 1051 goto error_call_jar; 1052 } 1053 1054 rxrpc_workqueue = alloc_ordered_workqueue("krxrpcd", WQ_HIGHPRI | WQ_MEM_RECLAIM); 1055 if (!rxrpc_workqueue) { 1056 pr_notice("Failed to allocate work queue\n"); 1057 goto error_work_queue; 1058 } 1059 1060 ret = rxrpc_init_security(); 1061 if (ret < 0) { 1062 pr_crit("Cannot initialise security\n"); 1063 goto error_security; 1064 } 1065 1066 ret = register_pernet_device(&rxrpc_net_ops); 1067 if (ret) 1068 goto error_pernet; 1069 1070 ret = proto_register(&rxrpc_proto, 1); 1071 if (ret < 0) { 1072 pr_crit("Cannot register protocol\n"); 1073 goto error_proto; 1074 } 1075 1076 ret = sock_register(&rxrpc_family_ops); 1077 if (ret < 0) { 1078 pr_crit("Cannot register socket family\n"); 1079 goto error_sock; 1080 } 1081 1082 ret = register_key_type(&key_type_rxrpc); 1083 if (ret < 0) { 1084 pr_crit("Cannot register client key type\n"); 1085 goto error_key_type; 1086 } 1087 1088 ret = register_key_type(&key_type_rxrpc_s); 1089 if (ret < 0) { 1090 pr_crit("Cannot register server key type\n"); 1091 goto error_key_type_s; 1092 } 1093 1094 ret = rxrpc_sysctl_init(); 1095 if (ret < 0) { 1096 pr_crit("Cannot register sysctls\n"); 1097 goto error_sysctls; 1098 } 1099 1100 return 0; 1101 1102 error_sysctls: 1103 unregister_key_type(&key_type_rxrpc_s); 1104 error_key_type_s: 1105 unregister_key_type(&key_type_rxrpc); 1106 error_key_type: 1107 sock_unregister(PF_RXRPC); 1108 error_sock: 1109 proto_unregister(&rxrpc_proto); 1110 error_proto: 1111 unregister_pernet_device(&rxrpc_net_ops); 1112 error_pernet: 1113 rxrpc_exit_security(); 1114 error_security: 1115 destroy_workqueue(rxrpc_workqueue); 1116 error_work_queue: 1117 kmem_cache_destroy(rxrpc_call_jar); 1118 error_call_jar: 1119 return ret; 1120 } 1121 1122 /* 1123 * unregister the RxRPC protocol 1124 */ 1125 static void __exit af_rxrpc_exit(void) 1126 { 1127 _enter(""); 1128 rxrpc_sysctl_exit(); 1129 unregister_key_type(&key_type_rxrpc_s); 1130 unregister_key_type(&key_type_rxrpc); 1131 sock_unregister(PF_RXRPC); 1132 proto_unregister(&rxrpc_proto); 1133 unregister_pernet_device(&rxrpc_net_ops); 1134 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0); 1135 1136 /* Make sure the local and peer records pinned by any dying connections 1137 * are released. 1138 */ 1139 rcu_barrier(); 1140 1141 destroy_workqueue(rxrpc_workqueue); 1142 rxrpc_exit_security(); 1143 kmem_cache_destroy(rxrpc_call_jar); 1144 _leave(""); 1145 } 1146 1147 module_init(af_rxrpc_init); 1148 module_exit(af_rxrpc_exit); 1149