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 25MODULE_DESCRIPTION("RxRPC network protocol"); 26MODULE_AUTHOR("Red Hat, Inc."); 27MODULE_LICENSE("GPL"); 28MODULE_ALIAS_NETPROTO(PF_RXRPC); 29 30unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; 31module_param_named(debug, rxrpc_debug, uint, 0644); 32MODULE_PARM_DESC(debug, "RxRPC debugging mask"); 33 34static struct proto rxrpc_proto; 35static const struct proto_ops rxrpc_rpc_ops; 36 37/* current debugging ID */ 38atomic_t rxrpc_debug_id; 39EXPORT_SYMBOL(rxrpc_debug_id); 40 41/* count of skbs currently in use */ 42atomic_t rxrpc_n_rx_skbs; 43 44struct workqueue_struct *rxrpc_workqueue; 45 46static void rxrpc_sock_destructor(struct sock *); 47 48/* 49 * see if an RxRPC socket is currently writable 50 */ 51static 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 */ 59static 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(sk, SOCK_WAKE_SPACE, POLL_OUT); 69 } 70 rcu_read_unlock(); 71} 72 73/* 74 * validate an RxRPC address 75 */ 76static 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 */ 130static 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 195service_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; 200error_unlock: 201 release_sock(&rx->sk); 202error: 203 _leave(" = %d", ret); 204 return ret; 205} 206 207/* 208 * set the number of pending calls permitted on a listening socket 209 */ 210static 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 and return it with a ref held. 269 */ 270struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock, 271 struct sockaddr_rxrpc *srx, gfp_t gfp) 272{ 273 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 274 int ret; 275 276 ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); 277 if (ret < 0) 278 return ERR_PTR(ret); 279 280 return rxrpc_lookup_peer(rx->local, srx, gfp); 281} 282EXPORT_SYMBOL(rxrpc_kernel_lookup_peer); 283 284/** 285 * rxrpc_kernel_get_peer - Get a reference on a peer 286 * @peer: The peer to get a reference on. 287 * 288 * Get a record for the remote peer in a call. 289 */ 290struct rxrpc_peer *rxrpc_kernel_get_peer(struct rxrpc_peer *peer) 291{ 292 return peer ? rxrpc_get_peer(peer, rxrpc_peer_get_application) : NULL; 293} 294EXPORT_SYMBOL(rxrpc_kernel_get_peer); 295 296/** 297 * rxrpc_kernel_put_peer - Allow a kernel app to drop a peer reference 298 * @peer: The peer to drop a ref on 299 */ 300void rxrpc_kernel_put_peer(struct rxrpc_peer *peer) 301{ 302 rxrpc_put_peer(peer, rxrpc_peer_put_application); 303} 304EXPORT_SYMBOL(rxrpc_kernel_put_peer); 305 306/** 307 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call 308 * @sock: The socket on which to make the call 309 * @peer: The peer to contact 310 * @key: The security context to use (defaults to socket setting) 311 * @user_call_ID: The ID to use 312 * @tx_total_len: Total length of data to transmit during the call (or -1) 313 * @hard_timeout: The maximum lifespan of the call in sec 314 * @gfp: The allocation constraints 315 * @notify_rx: Where to send notifications instead of socket queue 316 * @service_id: The ID of the service to contact 317 * @upgrade: Request service upgrade for call 318 * @interruptibility: The call is interruptible, or can be canceled. 319 * @debug_id: The debug ID for tracing to be assigned to the call 320 * 321 * Allow a kernel service to begin a call on the nominated socket. This just 322 * sets up all the internal tracking structures and allocates connection and 323 * call IDs as appropriate. The call to be used is returned. 324 * 325 * The default socket destination address and security may be overridden by 326 * supplying @srx and @key. 327 */ 328struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, 329 struct rxrpc_peer *peer, 330 struct key *key, 331 unsigned long user_call_ID, 332 s64 tx_total_len, 333 u32 hard_timeout, 334 gfp_t gfp, 335 rxrpc_notify_rx_t notify_rx, 336 u16 service_id, 337 bool upgrade, 338 enum rxrpc_interruptibility interruptibility, 339 unsigned int debug_id) 340{ 341 struct rxrpc_conn_parameters cp; 342 struct rxrpc_call_params p; 343 struct rxrpc_call *call; 344 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 345 346 _enter(",,%x,%lx", key_serial(key), user_call_ID); 347 348 if (WARN_ON_ONCE(peer->local != rx->local)) 349 return ERR_PTR(-EIO); 350 351 lock_sock(&rx->sk); 352 353 if (!key) 354 key = rx->key; 355 if (key && !key->payload.data[0]) 356 key = NULL; /* a no-security key */ 357 358 memset(&p, 0, sizeof(p)); 359 p.user_call_ID = user_call_ID; 360 p.tx_total_len = tx_total_len; 361 p.interruptibility = interruptibility; 362 p.kernel = true; 363 p.timeouts.hard = hard_timeout; 364 365 memset(&cp, 0, sizeof(cp)); 366 cp.local = rx->local; 367 cp.peer = peer; 368 cp.key = key; 369 cp.security_level = rx->min_sec_level; 370 cp.exclusive = false; 371 cp.upgrade = upgrade; 372 cp.service_id = service_id; 373 call = rxrpc_new_client_call(rx, &cp, &p, gfp, debug_id); 374 /* The socket has been unlocked. */ 375 if (!IS_ERR(call)) { 376 call->notify_rx = notify_rx; 377 mutex_unlock(&call->user_mutex); 378 } 379 380 _leave(" = %p", call); 381 return call; 382} 383EXPORT_SYMBOL(rxrpc_kernel_begin_call); 384 385/* 386 * Dummy function used to stop the notifier talking to recvmsg(). 387 */ 388static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall, 389 unsigned long call_user_ID) 390{ 391} 392 393/** 394 * rxrpc_kernel_shutdown_call - Allow a kernel service to shut down a call it was using 395 * @sock: The socket the call is on 396 * @call: The call to end 397 * 398 * Allow a kernel service to shut down a call it was using. The call must be 399 * complete before this is called (the call should be aborted if necessary). 400 */ 401void rxrpc_kernel_shutdown_call(struct socket *sock, struct rxrpc_call *call) 402{ 403 _enter("%d{%d}", call->debug_id, refcount_read(&call->ref)); 404 405 mutex_lock(&call->user_mutex); 406 if (!test_bit(RXRPC_CALL_RELEASED, &call->flags)) { 407 rxrpc_release_call(rxrpc_sk(sock->sk), call); 408 409 /* Make sure we're not going to call back into a kernel service */ 410 if (call->notify_rx) { 411 spin_lock(&call->notify_lock); 412 call->notify_rx = rxrpc_dummy_notify_rx; 413 spin_unlock(&call->notify_lock); 414 } 415 } 416 mutex_unlock(&call->user_mutex); 417} 418EXPORT_SYMBOL(rxrpc_kernel_shutdown_call); 419 420/** 421 * rxrpc_kernel_put_call - Release a reference to a call 422 * @sock: The socket the call is on 423 * @call: The call to put 424 * 425 * Drop the application's ref on an rxrpc call. 426 */ 427void rxrpc_kernel_put_call(struct socket *sock, struct rxrpc_call *call) 428{ 429 rxrpc_put_call(call, rxrpc_call_put_kernel); 430} 431EXPORT_SYMBOL(rxrpc_kernel_put_call); 432 433/** 434 * rxrpc_kernel_check_life - Check to see whether a call is still alive 435 * @sock: The socket the call is on 436 * @call: The call to check 437 * 438 * Allow a kernel service to find out whether a call is still alive - whether 439 * it has completed successfully and all received data has been consumed. 440 */ 441bool rxrpc_kernel_check_life(const struct socket *sock, 442 const struct rxrpc_call *call) 443{ 444 if (!rxrpc_call_is_complete(call)) 445 return true; 446 if (call->completion != RXRPC_CALL_SUCCEEDED) 447 return false; 448 return !skb_queue_empty(&call->recvmsg_queue); 449} 450EXPORT_SYMBOL(rxrpc_kernel_check_life); 451 452/** 453 * rxrpc_kernel_get_epoch - Retrieve the epoch value from a call. 454 * @sock: The socket the call is on 455 * @call: The call to query 456 * 457 * Allow a kernel service to retrieve the epoch value from a service call to 458 * see if the client at the other end rebooted. 459 */ 460u32 rxrpc_kernel_get_epoch(struct socket *sock, struct rxrpc_call *call) 461{ 462 return call->conn->proto.epoch; 463} 464EXPORT_SYMBOL(rxrpc_kernel_get_epoch); 465 466/** 467 * rxrpc_kernel_new_call_notification - Get notifications of new calls 468 * @sock: The socket to intercept received messages on 469 * @notify_new_call: Function to be called when new calls appear 470 * @discard_new_call: Function to discard preallocated calls 471 * 472 * Allow a kernel service to be given notifications about new calls. 473 */ 474void rxrpc_kernel_new_call_notification( 475 struct socket *sock, 476 rxrpc_notify_new_call_t notify_new_call, 477 rxrpc_discard_new_call_t discard_new_call) 478{ 479 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 480 481 rx->notify_new_call = notify_new_call; 482 rx->discard_new_call = discard_new_call; 483} 484EXPORT_SYMBOL(rxrpc_kernel_new_call_notification); 485 486/** 487 * rxrpc_kernel_set_max_life - Set maximum lifespan on a call 488 * @sock: The socket the call is on 489 * @call: The call to configure 490 * @hard_timeout: The maximum lifespan of the call in ms 491 * 492 * Set the maximum lifespan of a call. The call will end with ETIME or 493 * ETIMEDOUT if it takes longer than this. 494 */ 495void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call, 496 unsigned long hard_timeout) 497{ 498 ktime_t delay = ms_to_ktime(hard_timeout), expect_term_by; 499 500 mutex_lock(&call->user_mutex); 501 502 expect_term_by = ktime_add(ktime_get_real(), delay); 503 WRITE_ONCE(call->expect_term_by, expect_term_by); 504 trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard); 505 rxrpc_poke_call(call, rxrpc_call_poke_set_timeout); 506 507 mutex_unlock(&call->user_mutex); 508} 509EXPORT_SYMBOL(rxrpc_kernel_set_max_life); 510 511/* 512 * connect an RxRPC socket 513 * - this just targets it at a specific destination; no actual connection 514 * negotiation takes place 515 */ 516static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, 517 int addr_len, int flags) 518{ 519 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; 520 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 521 int ret; 522 523 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); 524 525 ret = rxrpc_validate_address(rx, srx, addr_len); 526 if (ret < 0) { 527 _leave(" = %d [bad addr]", ret); 528 return ret; 529 } 530 531 lock_sock(&rx->sk); 532 533 ret = -EISCONN; 534 if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) 535 goto error; 536 537 switch (rx->sk.sk_state) { 538 case RXRPC_UNBOUND: 539 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; 540 break; 541 case RXRPC_CLIENT_UNBOUND: 542 case RXRPC_CLIENT_BOUND: 543 break; 544 default: 545 ret = -EBUSY; 546 goto error; 547 } 548 549 rx->connect_srx = *srx; 550 set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); 551 ret = 0; 552 553error: 554 release_sock(&rx->sk); 555 return ret; 556} 557 558/* 559 * send a message through an RxRPC socket 560 * - in a client this does a number of things: 561 * - finds/sets up a connection for the security specified (if any) 562 * - initiates a call (ID in control data) 563 * - ends the request phase of a call (if MSG_MORE is not set) 564 * - sends a call data packet 565 * - may send an abort (abort code in control data) 566 */ 567static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) 568{ 569 struct rxrpc_local *local; 570 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 571 int ret; 572 573 _enter(",{%d},,%zu", rx->sk.sk_state, len); 574 575 if (m->msg_flags & MSG_OOB) 576 return -EOPNOTSUPP; 577 578 if (m->msg_name) { 579 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); 580 if (ret < 0) { 581 _leave(" = %d [bad addr]", ret); 582 return ret; 583 } 584 } 585 586 lock_sock(&rx->sk); 587 588 switch (rx->sk.sk_state) { 589 case RXRPC_UNBOUND: 590 case RXRPC_CLIENT_UNBOUND: 591 rx->srx.srx_family = AF_RXRPC; 592 rx->srx.srx_service = 0; 593 rx->srx.transport_type = SOCK_DGRAM; 594 rx->srx.transport.family = rx->family; 595 switch (rx->family) { 596 case AF_INET: 597 rx->srx.transport_len = sizeof(struct sockaddr_in); 598 break; 599#ifdef CONFIG_AF_RXRPC_IPV6 600 case AF_INET6: 601 rx->srx.transport_len = sizeof(struct sockaddr_in6); 602 break; 603#endif 604 default: 605 ret = -EAFNOSUPPORT; 606 goto error_unlock; 607 } 608 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx); 609 if (IS_ERR(local)) { 610 ret = PTR_ERR(local); 611 goto error_unlock; 612 } 613 614 rx->local = local; 615 rx->sk.sk_state = RXRPC_CLIENT_BOUND; 616 fallthrough; 617 618 case RXRPC_CLIENT_BOUND: 619 if (!m->msg_name && 620 test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { 621 m->msg_name = &rx->connect_srx; 622 m->msg_namelen = sizeof(rx->connect_srx); 623 } 624 fallthrough; 625 case RXRPC_SERVER_BOUND: 626 case RXRPC_SERVER_LISTENING: 627 ret = rxrpc_do_sendmsg(rx, m, len); 628 /* The socket has been unlocked */ 629 goto out; 630 default: 631 ret = -EINVAL; 632 goto error_unlock; 633 } 634 635error_unlock: 636 release_sock(&rx->sk); 637out: 638 _leave(" = %d", ret); 639 return ret; 640} 641 642int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val) 643{ 644 if (sk->sk_state != RXRPC_UNBOUND) 645 return -EISCONN; 646 if (val > RXRPC_SECURITY_MAX) 647 return -EINVAL; 648 lock_sock(sk); 649 rxrpc_sk(sk)->min_sec_level = val; 650 release_sock(sk); 651 return 0; 652} 653EXPORT_SYMBOL(rxrpc_sock_set_min_security_level); 654 655/* 656 * set RxRPC socket options 657 */ 658static int rxrpc_setsockopt(struct socket *sock, int level, int optname, 659 sockptr_t optval, unsigned int optlen) 660{ 661 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 662 unsigned int min_sec_level; 663 u16 service_upgrade[2]; 664 int ret; 665 666 _enter(",%d,%d,,%d", level, optname, optlen); 667 668 lock_sock(&rx->sk); 669 ret = -EOPNOTSUPP; 670 671 if (level == SOL_RXRPC) { 672 switch (optname) { 673 case RXRPC_EXCLUSIVE_CONNECTION: 674 ret = -EINVAL; 675 if (optlen != 0) 676 goto error; 677 ret = -EISCONN; 678 if (rx->sk.sk_state != RXRPC_UNBOUND) 679 goto error; 680 rx->exclusive = true; 681 goto success; 682 683 case RXRPC_SECURITY_KEY: 684 ret = -EINVAL; 685 if (rx->key) 686 goto error; 687 ret = -EISCONN; 688 if (rx->sk.sk_state != RXRPC_UNBOUND) 689 goto error; 690 ret = rxrpc_request_key(rx, optval, optlen); 691 goto error; 692 693 case RXRPC_SECURITY_KEYRING: 694 ret = -EINVAL; 695 if (rx->key) 696 goto error; 697 ret = -EISCONN; 698 if (rx->sk.sk_state != RXRPC_UNBOUND) 699 goto error; 700 ret = rxrpc_server_keyring(rx, optval, optlen); 701 goto error; 702 703 case RXRPC_MIN_SECURITY_LEVEL: 704 ret = -EINVAL; 705 if (optlen != sizeof(unsigned int)) 706 goto error; 707 ret = -EISCONN; 708 if (rx->sk.sk_state != RXRPC_UNBOUND) 709 goto error; 710 ret = copy_from_sockptr(&min_sec_level, optval, 711 sizeof(unsigned int)); 712 if (ret < 0) 713 goto error; 714 ret = -EINVAL; 715 if (min_sec_level > RXRPC_SECURITY_MAX) 716 goto error; 717 rx->min_sec_level = min_sec_level; 718 goto success; 719 720 case RXRPC_UPGRADEABLE_SERVICE: 721 ret = -EINVAL; 722 if (optlen != sizeof(service_upgrade) || 723 rx->service_upgrade.from != 0) 724 goto error; 725 ret = -EISCONN; 726 if (rx->sk.sk_state != RXRPC_SERVER_BOUND2) 727 goto error; 728 ret = -EFAULT; 729 if (copy_from_sockptr(service_upgrade, optval, 730 sizeof(service_upgrade)) != 0) 731 goto error; 732 ret = -EINVAL; 733 if ((service_upgrade[0] != rx->srx.srx_service || 734 service_upgrade[1] != rx->second_service) && 735 (service_upgrade[0] != rx->second_service || 736 service_upgrade[1] != rx->srx.srx_service)) 737 goto error; 738 rx->service_upgrade.from = service_upgrade[0]; 739 rx->service_upgrade.to = service_upgrade[1]; 740 goto success; 741 742 default: 743 break; 744 } 745 } 746 747success: 748 ret = 0; 749error: 750 release_sock(&rx->sk); 751 return ret; 752} 753 754/* 755 * Get socket options. 756 */ 757static int rxrpc_getsockopt(struct socket *sock, int level, int optname, 758 char __user *optval, int __user *_optlen) 759{ 760 int optlen; 761 762 if (level != SOL_RXRPC) 763 return -EOPNOTSUPP; 764 765 if (get_user(optlen, _optlen)) 766 return -EFAULT; 767 768 switch (optname) { 769 case RXRPC_SUPPORTED_CMSG: 770 if (optlen < sizeof(int)) 771 return -ETOOSMALL; 772 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) || 773 put_user(sizeof(int), _optlen)) 774 return -EFAULT; 775 return 0; 776 777 default: 778 return -EOPNOTSUPP; 779 } 780} 781 782/* 783 * permit an RxRPC socket to be polled 784 */ 785static __poll_t rxrpc_poll(struct file *file, struct socket *sock, 786 poll_table *wait) 787{ 788 struct sock *sk = sock->sk; 789 struct rxrpc_sock *rx = rxrpc_sk(sk); 790 __poll_t mask; 791 792 sock_poll_wait(file, sock, wait); 793 mask = 0; 794 795 /* the socket is readable if there are any messages waiting on the Rx 796 * queue */ 797 if (!list_empty(&rx->recvmsg_q)) 798 mask |= EPOLLIN | EPOLLRDNORM; 799 800 /* the socket is writable if there is space to add new data to the 801 * socket; there is no guarantee that any particular call in progress 802 * on the socket may have space in the Tx ACK window */ 803 if (rxrpc_writable(sk)) 804 mask |= EPOLLOUT | EPOLLWRNORM; 805 806 return mask; 807} 808 809/* 810 * create an RxRPC socket 811 */ 812static int rxrpc_create(struct net *net, struct socket *sock, int protocol, 813 int kern) 814{ 815 struct rxrpc_net *rxnet; 816 struct rxrpc_sock *rx; 817 struct sock *sk; 818 819 _enter("%p,%d", sock, protocol); 820 821 /* we support transport protocol UDP/UDP6 only */ 822 if (protocol != PF_INET && 823 IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6) 824 return -EPROTONOSUPPORT; 825 826 if (sock->type != SOCK_DGRAM) 827 return -ESOCKTNOSUPPORT; 828 829 sock->ops = &rxrpc_rpc_ops; 830 sock->state = SS_UNCONNECTED; 831 832 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); 833 if (!sk) 834 return -ENOMEM; 835 836 sock_init_data(sock, sk); 837 sock_set_flag(sk, SOCK_RCU_FREE); 838 sk->sk_state = RXRPC_UNBOUND; 839 sk->sk_write_space = rxrpc_write_space; 840 sk->sk_max_ack_backlog = 0; 841 sk->sk_destruct = rxrpc_sock_destructor; 842 843 rx = rxrpc_sk(sk); 844 rx->family = protocol; 845 rx->calls = RB_ROOT; 846 847 spin_lock_init(&rx->incoming_lock); 848 INIT_LIST_HEAD(&rx->sock_calls); 849 INIT_LIST_HEAD(&rx->to_be_accepted); 850 INIT_LIST_HEAD(&rx->recvmsg_q); 851 spin_lock_init(&rx->recvmsg_lock); 852 rwlock_init(&rx->call_lock); 853 memset(&rx->srx, 0, sizeof(rx->srx)); 854 855 rxnet = rxrpc_net(sock_net(&rx->sk)); 856 timer_reduce(&rxnet->peer_keepalive_timer, jiffies + 1); 857 858 _leave(" = 0 [%p]", rx); 859 return 0; 860} 861 862/* 863 * Kill all the calls on a socket and shut it down. 864 */ 865static int rxrpc_shutdown(struct socket *sock, int flags) 866{ 867 struct sock *sk = sock->sk; 868 struct rxrpc_sock *rx = rxrpc_sk(sk); 869 int ret = 0; 870 871 _enter("%p,%d", sk, flags); 872 873 if (flags != SHUT_RDWR) 874 return -EOPNOTSUPP; 875 if (sk->sk_state == RXRPC_CLOSE) 876 return -ESHUTDOWN; 877 878 lock_sock(sk); 879 880 if (sk->sk_state < RXRPC_CLOSE) { 881 sk->sk_state = RXRPC_CLOSE; 882 sk->sk_shutdown = SHUTDOWN_MASK; 883 } else { 884 ret = -ESHUTDOWN; 885 } 886 887 rxrpc_discard_prealloc(rx); 888 889 release_sock(sk); 890 return ret; 891} 892 893/* 894 * RxRPC socket destructor 895 */ 896static void rxrpc_sock_destructor(struct sock *sk) 897{ 898 _enter("%p", sk); 899 900 rxrpc_purge_queue(&sk->sk_receive_queue); 901 902 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 903 WARN_ON(!sk_unhashed(sk)); 904 WARN_ON(sk->sk_socket); 905 906 if (!sock_flag(sk, SOCK_DEAD)) { 907 printk("Attempt to release alive rxrpc socket: %p\n", sk); 908 return; 909 } 910} 911 912/* 913 * release an RxRPC socket 914 */ 915static int rxrpc_release_sock(struct sock *sk) 916{ 917 struct rxrpc_sock *rx = rxrpc_sk(sk); 918 919 _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt)); 920 921 /* declare the socket closed for business */ 922 sock_orphan(sk); 923 sk->sk_shutdown = SHUTDOWN_MASK; 924 925 /* We want to kill off all connections from a service socket 926 * as fast as possible because we can't share these; client 927 * sockets, on the other hand, can share an endpoint. 928 */ 929 switch (sk->sk_state) { 930 case RXRPC_SERVER_BOUND: 931 case RXRPC_SERVER_BOUND2: 932 case RXRPC_SERVER_LISTENING: 933 case RXRPC_SERVER_LISTEN_DISABLED: 934 rx->local->service_closed = true; 935 break; 936 } 937 938 sk->sk_state = RXRPC_CLOSE; 939 940 if (rx->local && rx->local->service == rx) { 941 write_lock(&rx->local->services_lock); 942 rx->local->service = NULL; 943 write_unlock(&rx->local->services_lock); 944 } 945 946 /* try to flush out this socket */ 947 rxrpc_discard_prealloc(rx); 948 rxrpc_release_calls_on_socket(rx); 949 flush_workqueue(rxrpc_workqueue); 950 rxrpc_purge_queue(&sk->sk_receive_queue); 951 952 rxrpc_unuse_local(rx->local, rxrpc_local_unuse_release_sock); 953 rxrpc_put_local(rx->local, rxrpc_local_put_release_sock); 954 rx->local = NULL; 955 key_put(rx->key); 956 rx->key = NULL; 957 key_put(rx->securities); 958 rx->securities = NULL; 959 sock_put(sk); 960 961 _leave(" = 0"); 962 return 0; 963} 964 965/* 966 * release an RxRPC BSD socket on close() or equivalent 967 */ 968static int rxrpc_release(struct socket *sock) 969{ 970 struct sock *sk = sock->sk; 971 972 _enter("%p{%p}", sock, sk); 973 974 if (!sk) 975 return 0; 976 977 sock->sk = NULL; 978 979 return rxrpc_release_sock(sk); 980} 981 982/* 983 * RxRPC network protocol 984 */ 985static const struct proto_ops rxrpc_rpc_ops = { 986 .family = PF_RXRPC, 987 .owner = THIS_MODULE, 988 .release = rxrpc_release, 989 .bind = rxrpc_bind, 990 .connect = rxrpc_connect, 991 .socketpair = sock_no_socketpair, 992 .accept = sock_no_accept, 993 .getname = sock_no_getname, 994 .poll = rxrpc_poll, 995 .ioctl = sock_no_ioctl, 996 .listen = rxrpc_listen, 997 .shutdown = rxrpc_shutdown, 998 .setsockopt = rxrpc_setsockopt, 999 .getsockopt = rxrpc_getsockopt, 1000 .sendmsg = rxrpc_sendmsg, 1001 .recvmsg = rxrpc_recvmsg, 1002 .mmap = sock_no_mmap, 1003}; 1004 1005static struct proto rxrpc_proto = { 1006 .name = "RXRPC", 1007 .owner = THIS_MODULE, 1008 .obj_size = sizeof(struct rxrpc_sock), 1009 .max_header = sizeof(struct rxrpc_wire_header), 1010}; 1011 1012static const struct net_proto_family rxrpc_family_ops = { 1013 .family = PF_RXRPC, 1014 .create = rxrpc_create, 1015 .owner = THIS_MODULE, 1016}; 1017 1018/* 1019 * initialise and register the RxRPC protocol 1020 */ 1021static int __init af_rxrpc_init(void) 1022{ 1023 int ret = -1; 1024 1025 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof_field(struct sk_buff, cb)); 1026 1027 ret = -ENOMEM; 1028 rxrpc_gen_version_string(); 1029 rxrpc_call_jar = kmem_cache_create( 1030 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, 1031 SLAB_HWCACHE_ALIGN, NULL); 1032 if (!rxrpc_call_jar) { 1033 pr_notice("Failed to allocate call jar\n"); 1034 goto error_call_jar; 1035 } 1036 1037 rxrpc_workqueue = alloc_ordered_workqueue("krxrpcd", WQ_HIGHPRI | WQ_MEM_RECLAIM); 1038 if (!rxrpc_workqueue) { 1039 pr_notice("Failed to allocate work queue\n"); 1040 goto error_work_queue; 1041 } 1042 1043 ret = rxrpc_init_security(); 1044 if (ret < 0) { 1045 pr_crit("Cannot initialise security\n"); 1046 goto error_security; 1047 } 1048 1049 ret = register_pernet_device(&rxrpc_net_ops); 1050 if (ret) 1051 goto error_pernet; 1052 1053 ret = proto_register(&rxrpc_proto, 1); 1054 if (ret < 0) { 1055 pr_crit("Cannot register protocol\n"); 1056 goto error_proto; 1057 } 1058 1059 ret = sock_register(&rxrpc_family_ops); 1060 if (ret < 0) { 1061 pr_crit("Cannot register socket family\n"); 1062 goto error_sock; 1063 } 1064 1065 ret = register_key_type(&key_type_rxrpc); 1066 if (ret < 0) { 1067 pr_crit("Cannot register client key type\n"); 1068 goto error_key_type; 1069 } 1070 1071 ret = register_key_type(&key_type_rxrpc_s); 1072 if (ret < 0) { 1073 pr_crit("Cannot register server key type\n"); 1074 goto error_key_type_s; 1075 } 1076 1077 ret = rxrpc_sysctl_init(); 1078 if (ret < 0) { 1079 pr_crit("Cannot register sysctls\n"); 1080 goto error_sysctls; 1081 } 1082 1083 return 0; 1084 1085error_sysctls: 1086 unregister_key_type(&key_type_rxrpc_s); 1087error_key_type_s: 1088 unregister_key_type(&key_type_rxrpc); 1089error_key_type: 1090 sock_unregister(PF_RXRPC); 1091error_sock: 1092 proto_unregister(&rxrpc_proto); 1093error_proto: 1094 unregister_pernet_device(&rxrpc_net_ops); 1095error_pernet: 1096 rxrpc_exit_security(); 1097error_security: 1098 destroy_workqueue(rxrpc_workqueue); 1099error_work_queue: 1100 kmem_cache_destroy(rxrpc_call_jar); 1101error_call_jar: 1102 return ret; 1103} 1104 1105/* 1106 * unregister the RxRPC protocol 1107 */ 1108static void __exit af_rxrpc_exit(void) 1109{ 1110 _enter(""); 1111 rxrpc_sysctl_exit(); 1112 unregister_key_type(&key_type_rxrpc_s); 1113 unregister_key_type(&key_type_rxrpc); 1114 sock_unregister(PF_RXRPC); 1115 proto_unregister(&rxrpc_proto); 1116 unregister_pernet_device(&rxrpc_net_ops); 1117 ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0); 1118 1119 /* Make sure the local and peer records pinned by any dying connections 1120 * are released. 1121 */ 1122 rcu_barrier(); 1123 1124 destroy_workqueue(rxrpc_workqueue); 1125 rxrpc_exit_security(); 1126 kmem_cache_destroy(rxrpc_call_jar); 1127 _leave(""); 1128} 1129 1130module_init(af_rxrpc_init); 1131module_exit(af_rxrpc_exit); 1132