1 /* AF_RXRPC implementation 2 * 3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/net.h> 14 #include <linux/skbuff.h> 15 #include <linux/poll.h> 16 #include <linux/proc_fs.h> 17 #include <linux/key-type.h> 18 #include <net/net_namespace.h> 19 #include <net/sock.h> 20 #include <net/af_rxrpc.h> 21 #include "ar-internal.h" 22 23 MODULE_DESCRIPTION("RxRPC network protocol"); 24 MODULE_AUTHOR("Red Hat, Inc."); 25 MODULE_LICENSE("GPL"); 26 MODULE_ALIAS_NETPROTO(PF_RXRPC); 27 28 unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO; 29 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); 30 MODULE_PARM_DESC(debug, "RxRPC debugging mask"); 31 32 static int sysctl_rxrpc_max_qlen __read_mostly = 10; 33 34 static struct proto rxrpc_proto; 35 static const struct proto_ops rxrpc_rpc_ops; 36 37 /* local epoch for detecting local-end reset */ 38 __be32 rxrpc_epoch; 39 40 /* current debugging ID */ 41 atomic_t rxrpc_debug_id; 42 43 /* count of skbs currently in use */ 44 atomic_t rxrpc_n_skbs; 45 46 struct workqueue_struct *rxrpc_workqueue; 47 48 static void rxrpc_sock_destructor(struct sock *); 49 50 /* 51 * see if an RxRPC socket is currently writable 52 */ 53 static inline int rxrpc_writable(struct sock *sk) 54 { 55 return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; 56 } 57 58 /* 59 * wait for write bufferage to become available 60 */ 61 static void rxrpc_write_space(struct sock *sk) 62 { 63 _enter("%p", sk); 64 read_lock(&sk->sk_callback_lock); 65 if (rxrpc_writable(sk)) { 66 if (sk_has_sleeper(sk)) 67 wake_up_interruptible(sk->sk_sleep); 68 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 69 } 70 read_unlock(&sk->sk_callback_lock); 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 if (len < sizeof(struct sockaddr_rxrpc)) 81 return -EINVAL; 82 83 if (srx->srx_family != AF_RXRPC) 84 return -EAFNOSUPPORT; 85 86 if (srx->transport_type != SOCK_DGRAM) 87 return -ESOCKTNOSUPPORT; 88 89 len -= offsetof(struct sockaddr_rxrpc, transport); 90 if (srx->transport_len < sizeof(sa_family_t) || 91 srx->transport_len > len) 92 return -EINVAL; 93 94 if (srx->transport.family != rx->proto) 95 return -EAFNOSUPPORT; 96 97 switch (srx->transport.family) { 98 case AF_INET: 99 _debug("INET: %x @ %pI4", 100 ntohs(srx->transport.sin.sin_port), 101 &srx->transport.sin.sin_addr); 102 if (srx->transport_len > 8) 103 memset((void *)&srx->transport + 8, 0, 104 srx->transport_len - 8); 105 break; 106 107 case AF_INET6: 108 default: 109 return -EAFNOSUPPORT; 110 } 111 112 return 0; 113 } 114 115 /* 116 * bind a local address to an RxRPC socket 117 */ 118 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) 119 { 120 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr; 121 struct sock *sk = sock->sk; 122 struct rxrpc_local *local; 123 struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; 124 __be16 service_id; 125 int ret; 126 127 _enter("%p,%p,%d", rx, saddr, len); 128 129 ret = rxrpc_validate_address(rx, srx, len); 130 if (ret < 0) 131 goto error; 132 133 lock_sock(&rx->sk); 134 135 if (rx->sk.sk_state != RXRPC_UNCONNECTED) { 136 ret = -EINVAL; 137 goto error_unlock; 138 } 139 140 memcpy(&rx->srx, srx, sizeof(rx->srx)); 141 142 /* find a local transport endpoint if we don't have one already */ 143 local = rxrpc_lookup_local(&rx->srx); 144 if (IS_ERR(local)) { 145 ret = PTR_ERR(local); 146 goto error_unlock; 147 } 148 149 rx->local = local; 150 if (srx->srx_service) { 151 service_id = htons(srx->srx_service); 152 write_lock_bh(&local->services_lock); 153 list_for_each_entry(prx, &local->services, listen_link) { 154 if (prx->service_id == service_id) 155 goto service_in_use; 156 } 157 158 rx->service_id = service_id; 159 list_add_tail(&rx->listen_link, &local->services); 160 write_unlock_bh(&local->services_lock); 161 162 rx->sk.sk_state = RXRPC_SERVER_BOUND; 163 } else { 164 rx->sk.sk_state = RXRPC_CLIENT_BOUND; 165 } 166 167 release_sock(&rx->sk); 168 _leave(" = 0"); 169 return 0; 170 171 service_in_use: 172 ret = -EADDRINUSE; 173 write_unlock_bh(&local->services_lock); 174 error_unlock: 175 release_sock(&rx->sk); 176 error: 177 _leave(" = %d", ret); 178 return ret; 179 } 180 181 /* 182 * set the number of pending calls permitted on a listening socket 183 */ 184 static int rxrpc_listen(struct socket *sock, int backlog) 185 { 186 struct sock *sk = sock->sk; 187 struct rxrpc_sock *rx = rxrpc_sk(sk); 188 int ret; 189 190 _enter("%p,%d", rx, backlog); 191 192 lock_sock(&rx->sk); 193 194 switch (rx->sk.sk_state) { 195 case RXRPC_UNCONNECTED: 196 ret = -EADDRNOTAVAIL; 197 break; 198 case RXRPC_CLIENT_BOUND: 199 case RXRPC_CLIENT_CONNECTED: 200 default: 201 ret = -EBUSY; 202 break; 203 case RXRPC_SERVER_BOUND: 204 ASSERT(rx->local != NULL); 205 sk->sk_max_ack_backlog = backlog; 206 rx->sk.sk_state = RXRPC_SERVER_LISTENING; 207 ret = 0; 208 break; 209 } 210 211 release_sock(&rx->sk); 212 _leave(" = %d", ret); 213 return ret; 214 } 215 216 /* 217 * find a transport by address 218 */ 219 static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock, 220 struct sockaddr *addr, 221 int addr_len, int flags, 222 gfp_t gfp) 223 { 224 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; 225 struct rxrpc_transport *trans; 226 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 227 struct rxrpc_peer *peer; 228 229 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); 230 231 ASSERT(rx->local != NULL); 232 ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED); 233 234 if (rx->srx.transport_type != srx->transport_type) 235 return ERR_PTR(-ESOCKTNOSUPPORT); 236 if (rx->srx.transport.family != srx->transport.family) 237 return ERR_PTR(-EAFNOSUPPORT); 238 239 /* find a remote transport endpoint from the local one */ 240 peer = rxrpc_get_peer(srx, gfp); 241 if (IS_ERR(peer)) 242 return ERR_CAST(peer); 243 244 /* find a transport */ 245 trans = rxrpc_get_transport(rx->local, peer, gfp); 246 rxrpc_put_peer(peer); 247 _leave(" = %p", trans); 248 return trans; 249 } 250 251 /** 252 * rxrpc_kernel_begin_call - Allow a kernel service to begin a call 253 * @sock: The socket on which to make the call 254 * @srx: The address of the peer to contact (defaults to socket setting) 255 * @key: The security context to use (defaults to socket setting) 256 * @user_call_ID: The ID to use 257 * 258 * Allow a kernel service to begin a call on the nominated socket. This just 259 * sets up all the internal tracking structures and allocates connection and 260 * call IDs as appropriate. The call to be used is returned. 261 * 262 * The default socket destination address and security may be overridden by 263 * supplying @srx and @key. 264 */ 265 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, 266 struct sockaddr_rxrpc *srx, 267 struct key *key, 268 unsigned long user_call_ID, 269 gfp_t gfp) 270 { 271 struct rxrpc_conn_bundle *bundle; 272 struct rxrpc_transport *trans; 273 struct rxrpc_call *call; 274 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 275 __be16 service_id; 276 277 _enter(",,%x,%lx", key_serial(key), user_call_ID); 278 279 lock_sock(&rx->sk); 280 281 if (srx) { 282 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx, 283 sizeof(*srx), 0, gfp); 284 if (IS_ERR(trans)) { 285 call = ERR_CAST(trans); 286 trans = NULL; 287 goto out_notrans; 288 } 289 } else { 290 trans = rx->trans; 291 if (!trans) { 292 call = ERR_PTR(-ENOTCONN); 293 goto out_notrans; 294 } 295 atomic_inc(&trans->usage); 296 } 297 298 service_id = rx->service_id; 299 if (srx) 300 service_id = htons(srx->srx_service); 301 302 if (!key) 303 key = rx->key; 304 if (key && !key->payload.data) 305 key = NULL; /* a no-security key */ 306 307 bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp); 308 if (IS_ERR(bundle)) { 309 call = ERR_CAST(bundle); 310 goto out; 311 } 312 313 call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true, 314 gfp); 315 rxrpc_put_bundle(trans, bundle); 316 out: 317 rxrpc_put_transport(trans); 318 out_notrans: 319 release_sock(&rx->sk); 320 _leave(" = %p", call); 321 return call; 322 } 323 324 EXPORT_SYMBOL(rxrpc_kernel_begin_call); 325 326 /** 327 * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using 328 * @call: The call to end 329 * 330 * Allow a kernel service to end a call it was using. The call must be 331 * complete before this is called (the call should be aborted if necessary). 332 */ 333 void rxrpc_kernel_end_call(struct rxrpc_call *call) 334 { 335 _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); 336 rxrpc_remove_user_ID(call->socket, call); 337 rxrpc_put_call(call); 338 } 339 340 EXPORT_SYMBOL(rxrpc_kernel_end_call); 341 342 /** 343 * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages 344 * @sock: The socket to intercept received messages on 345 * @interceptor: The function to pass the messages to 346 * 347 * Allow a kernel service to intercept messages heading for the Rx queue on an 348 * RxRPC socket. They get passed to the specified function instead. 349 * @interceptor should free the socket buffers it is given. @interceptor is 350 * called with the socket receive queue spinlock held and softirqs disabled - 351 * this ensures that the messages will be delivered in the right order. 352 */ 353 void rxrpc_kernel_intercept_rx_messages(struct socket *sock, 354 rxrpc_interceptor_t interceptor) 355 { 356 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 357 358 _enter(""); 359 rx->interceptor = interceptor; 360 } 361 362 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); 363 364 /* 365 * connect an RxRPC socket 366 * - this just targets it at a specific destination; no actual connection 367 * negotiation takes place 368 */ 369 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, 370 int addr_len, int flags) 371 { 372 struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; 373 struct sock *sk = sock->sk; 374 struct rxrpc_transport *trans; 375 struct rxrpc_local *local; 376 struct rxrpc_sock *rx = rxrpc_sk(sk); 377 int ret; 378 379 _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); 380 381 ret = rxrpc_validate_address(rx, srx, addr_len); 382 if (ret < 0) { 383 _leave(" = %d [bad addr]", ret); 384 return ret; 385 } 386 387 lock_sock(&rx->sk); 388 389 switch (rx->sk.sk_state) { 390 case RXRPC_UNCONNECTED: 391 /* find a local transport endpoint if we don't have one already */ 392 ASSERTCMP(rx->local, ==, NULL); 393 rx->srx.srx_family = AF_RXRPC; 394 rx->srx.srx_service = 0; 395 rx->srx.transport_type = srx->transport_type; 396 rx->srx.transport_len = sizeof(sa_family_t); 397 rx->srx.transport.family = srx->transport.family; 398 local = rxrpc_lookup_local(&rx->srx); 399 if (IS_ERR(local)) { 400 release_sock(&rx->sk); 401 return PTR_ERR(local); 402 } 403 rx->local = local; 404 rx->sk.sk_state = RXRPC_CLIENT_BOUND; 405 case RXRPC_CLIENT_BOUND: 406 break; 407 case RXRPC_CLIENT_CONNECTED: 408 release_sock(&rx->sk); 409 return -EISCONN; 410 default: 411 release_sock(&rx->sk); 412 return -EBUSY; /* server sockets can't connect as well */ 413 } 414 415 trans = rxrpc_name_to_transport(sock, addr, addr_len, flags, 416 GFP_KERNEL); 417 if (IS_ERR(trans)) { 418 release_sock(&rx->sk); 419 _leave(" = %ld", PTR_ERR(trans)); 420 return PTR_ERR(trans); 421 } 422 423 rx->trans = trans; 424 rx->service_id = htons(srx->srx_service); 425 rx->sk.sk_state = RXRPC_CLIENT_CONNECTED; 426 427 release_sock(&rx->sk); 428 return 0; 429 } 430 431 /* 432 * send a message through an RxRPC socket 433 * - in a client this does a number of things: 434 * - finds/sets up a connection for the security specified (if any) 435 * - initiates a call (ID in control data) 436 * - ends the request phase of a call (if MSG_MORE is not set) 437 * - sends a call data packet 438 * - may send an abort (abort code in control data) 439 */ 440 static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock, 441 struct msghdr *m, size_t len) 442 { 443 struct rxrpc_transport *trans; 444 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 445 int ret; 446 447 _enter(",{%d},,%zu", rx->sk.sk_state, len); 448 449 if (m->msg_flags & MSG_OOB) 450 return -EOPNOTSUPP; 451 452 if (m->msg_name) { 453 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); 454 if (ret < 0) { 455 _leave(" = %d [bad addr]", ret); 456 return ret; 457 } 458 } 459 460 trans = NULL; 461 lock_sock(&rx->sk); 462 463 if (m->msg_name) { 464 ret = -EISCONN; 465 trans = rxrpc_name_to_transport(sock, m->msg_name, 466 m->msg_namelen, 0, GFP_KERNEL); 467 if (IS_ERR(trans)) { 468 ret = PTR_ERR(trans); 469 trans = NULL; 470 goto out; 471 } 472 } else { 473 trans = rx->trans; 474 if (trans) 475 atomic_inc(&trans->usage); 476 } 477 478 switch (rx->sk.sk_state) { 479 case RXRPC_SERVER_LISTENING: 480 if (!m->msg_name) { 481 ret = rxrpc_server_sendmsg(iocb, rx, m, len); 482 break; 483 } 484 case RXRPC_SERVER_BOUND: 485 case RXRPC_CLIENT_BOUND: 486 if (!m->msg_name) { 487 ret = -ENOTCONN; 488 break; 489 } 490 case RXRPC_CLIENT_CONNECTED: 491 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len); 492 break; 493 default: 494 ret = -ENOTCONN; 495 break; 496 } 497 498 out: 499 release_sock(&rx->sk); 500 if (trans) 501 rxrpc_put_transport(trans); 502 _leave(" = %d", ret); 503 return ret; 504 } 505 506 /* 507 * set RxRPC socket options 508 */ 509 static int rxrpc_setsockopt(struct socket *sock, int level, int optname, 510 char __user *optval, int optlen) 511 { 512 struct rxrpc_sock *rx = rxrpc_sk(sock->sk); 513 unsigned min_sec_level; 514 int ret; 515 516 _enter(",%d,%d,,%d", level, optname, optlen); 517 518 lock_sock(&rx->sk); 519 ret = -EOPNOTSUPP; 520 521 if (level == SOL_RXRPC) { 522 switch (optname) { 523 case RXRPC_EXCLUSIVE_CONNECTION: 524 ret = -EINVAL; 525 if (optlen != 0) 526 goto error; 527 ret = -EISCONN; 528 if (rx->sk.sk_state != RXRPC_UNCONNECTED) 529 goto error; 530 set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); 531 goto success; 532 533 case RXRPC_SECURITY_KEY: 534 ret = -EINVAL; 535 if (rx->key) 536 goto error; 537 ret = -EISCONN; 538 if (rx->sk.sk_state != RXRPC_UNCONNECTED) 539 goto error; 540 ret = rxrpc_request_key(rx, optval, optlen); 541 goto error; 542 543 case RXRPC_SECURITY_KEYRING: 544 ret = -EINVAL; 545 if (rx->key) 546 goto error; 547 ret = -EISCONN; 548 if (rx->sk.sk_state != RXRPC_UNCONNECTED) 549 goto error; 550 ret = rxrpc_server_keyring(rx, optval, optlen); 551 goto error; 552 553 case RXRPC_MIN_SECURITY_LEVEL: 554 ret = -EINVAL; 555 if (optlen != sizeof(unsigned)) 556 goto error; 557 ret = -EISCONN; 558 if (rx->sk.sk_state != RXRPC_UNCONNECTED) 559 goto error; 560 ret = get_user(min_sec_level, 561 (unsigned __user *) optval); 562 if (ret < 0) 563 goto error; 564 ret = -EINVAL; 565 if (min_sec_level > RXRPC_SECURITY_MAX) 566 goto error; 567 rx->min_sec_level = min_sec_level; 568 goto success; 569 570 default: 571 break; 572 } 573 } 574 575 success: 576 ret = 0; 577 error: 578 release_sock(&rx->sk); 579 return ret; 580 } 581 582 /* 583 * permit an RxRPC socket to be polled 584 */ 585 static unsigned int rxrpc_poll(struct file *file, struct socket *sock, 586 poll_table *wait) 587 { 588 unsigned int mask; 589 struct sock *sk = sock->sk; 590 591 sock_poll_wait(file, sk->sk_sleep, wait); 592 mask = 0; 593 594 /* the socket is readable if there are any messages waiting on the Rx 595 * queue */ 596 if (!skb_queue_empty(&sk->sk_receive_queue)) 597 mask |= POLLIN | POLLRDNORM; 598 599 /* the socket is writable if there is space to add new data to the 600 * socket; there is no guarantee that any particular call in progress 601 * on the socket may have space in the Tx ACK window */ 602 if (rxrpc_writable(sk)) 603 mask |= POLLOUT | POLLWRNORM; 604 605 return mask; 606 } 607 608 /* 609 * create an RxRPC socket 610 */ 611 static int rxrpc_create(struct net *net, struct socket *sock, int protocol) 612 { 613 struct rxrpc_sock *rx; 614 struct sock *sk; 615 616 _enter("%p,%d", sock, protocol); 617 618 if (net != &init_net) 619 return -EAFNOSUPPORT; 620 621 /* we support transport protocol UDP only */ 622 if (protocol != PF_INET) 623 return -EPROTONOSUPPORT; 624 625 if (sock->type != SOCK_DGRAM) 626 return -ESOCKTNOSUPPORT; 627 628 sock->ops = &rxrpc_rpc_ops; 629 sock->state = SS_UNCONNECTED; 630 631 sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto); 632 if (!sk) 633 return -ENOMEM; 634 635 sock_init_data(sock, sk); 636 sk->sk_state = RXRPC_UNCONNECTED; 637 sk->sk_write_space = rxrpc_write_space; 638 sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen; 639 sk->sk_destruct = rxrpc_sock_destructor; 640 641 rx = rxrpc_sk(sk); 642 rx->proto = protocol; 643 rx->calls = RB_ROOT; 644 645 INIT_LIST_HEAD(&rx->listen_link); 646 INIT_LIST_HEAD(&rx->secureq); 647 INIT_LIST_HEAD(&rx->acceptq); 648 rwlock_init(&rx->call_lock); 649 memset(&rx->srx, 0, sizeof(rx->srx)); 650 651 _leave(" = 0 [%p]", rx); 652 return 0; 653 } 654 655 /* 656 * RxRPC socket destructor 657 */ 658 static void rxrpc_sock_destructor(struct sock *sk) 659 { 660 _enter("%p", sk); 661 662 rxrpc_purge_queue(&sk->sk_receive_queue); 663 664 WARN_ON(atomic_read(&sk->sk_wmem_alloc)); 665 WARN_ON(!sk_unhashed(sk)); 666 WARN_ON(sk->sk_socket); 667 668 if (!sock_flag(sk, SOCK_DEAD)) { 669 printk("Attempt to release alive rxrpc socket: %p\n", sk); 670 return; 671 } 672 } 673 674 /* 675 * release an RxRPC socket 676 */ 677 static int rxrpc_release_sock(struct sock *sk) 678 { 679 struct rxrpc_sock *rx = rxrpc_sk(sk); 680 681 _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); 682 683 /* declare the socket closed for business */ 684 sock_orphan(sk); 685 sk->sk_shutdown = SHUTDOWN_MASK; 686 687 spin_lock_bh(&sk->sk_receive_queue.lock); 688 sk->sk_state = RXRPC_CLOSE; 689 spin_unlock_bh(&sk->sk_receive_queue.lock); 690 691 ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); 692 693 if (!list_empty(&rx->listen_link)) { 694 write_lock_bh(&rx->local->services_lock); 695 list_del(&rx->listen_link); 696 write_unlock_bh(&rx->local->services_lock); 697 } 698 699 /* try to flush out this socket */ 700 rxrpc_release_calls_on_socket(rx); 701 flush_workqueue(rxrpc_workqueue); 702 rxrpc_purge_queue(&sk->sk_receive_queue); 703 704 if (rx->conn) { 705 rxrpc_put_connection(rx->conn); 706 rx->conn = NULL; 707 } 708 709 if (rx->bundle) { 710 rxrpc_put_bundle(rx->trans, rx->bundle); 711 rx->bundle = NULL; 712 } 713 if (rx->trans) { 714 rxrpc_put_transport(rx->trans); 715 rx->trans = NULL; 716 } 717 if (rx->local) { 718 rxrpc_put_local(rx->local); 719 rx->local = NULL; 720 } 721 722 key_put(rx->key); 723 rx->key = NULL; 724 key_put(rx->securities); 725 rx->securities = NULL; 726 sock_put(sk); 727 728 _leave(" = 0"); 729 return 0; 730 } 731 732 /* 733 * release an RxRPC BSD socket on close() or equivalent 734 */ 735 static int rxrpc_release(struct socket *sock) 736 { 737 struct sock *sk = sock->sk; 738 739 _enter("%p{%p}", sock, sk); 740 741 if (!sk) 742 return 0; 743 744 sock->sk = NULL; 745 746 return rxrpc_release_sock(sk); 747 } 748 749 /* 750 * RxRPC network protocol 751 */ 752 static const struct proto_ops rxrpc_rpc_ops = { 753 .family = PF_UNIX, 754 .owner = THIS_MODULE, 755 .release = rxrpc_release, 756 .bind = rxrpc_bind, 757 .connect = rxrpc_connect, 758 .socketpair = sock_no_socketpair, 759 .accept = sock_no_accept, 760 .getname = sock_no_getname, 761 .poll = rxrpc_poll, 762 .ioctl = sock_no_ioctl, 763 .listen = rxrpc_listen, 764 .shutdown = sock_no_shutdown, 765 .setsockopt = rxrpc_setsockopt, 766 .getsockopt = sock_no_getsockopt, 767 .sendmsg = rxrpc_sendmsg, 768 .recvmsg = rxrpc_recvmsg, 769 .mmap = sock_no_mmap, 770 .sendpage = sock_no_sendpage, 771 }; 772 773 static struct proto rxrpc_proto = { 774 .name = "RXRPC", 775 .owner = THIS_MODULE, 776 .obj_size = sizeof(struct rxrpc_sock), 777 .max_header = sizeof(struct rxrpc_header), 778 }; 779 780 static struct net_proto_family rxrpc_family_ops = { 781 .family = PF_RXRPC, 782 .create = rxrpc_create, 783 .owner = THIS_MODULE, 784 }; 785 786 /* 787 * initialise and register the RxRPC protocol 788 */ 789 static int __init af_rxrpc_init(void) 790 { 791 struct sk_buff *dummy_skb; 792 int ret = -1; 793 794 BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb)); 795 796 rxrpc_epoch = htonl(get_seconds()); 797 798 ret = -ENOMEM; 799 rxrpc_call_jar = kmem_cache_create( 800 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, 801 SLAB_HWCACHE_ALIGN, NULL); 802 if (!rxrpc_call_jar) { 803 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n"); 804 goto error_call_jar; 805 } 806 807 rxrpc_workqueue = create_workqueue("krxrpcd"); 808 if (!rxrpc_workqueue) { 809 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n"); 810 goto error_work_queue; 811 } 812 813 ret = proto_register(&rxrpc_proto, 1); 814 if (ret < 0) { 815 printk(KERN_CRIT "RxRPC: Cannot register protocol\n"); 816 goto error_proto; 817 } 818 819 ret = sock_register(&rxrpc_family_ops); 820 if (ret < 0) { 821 printk(KERN_CRIT "RxRPC: Cannot register socket family\n"); 822 goto error_sock; 823 } 824 825 ret = register_key_type(&key_type_rxrpc); 826 if (ret < 0) { 827 printk(KERN_CRIT "RxRPC: Cannot register client key type\n"); 828 goto error_key_type; 829 } 830 831 ret = register_key_type(&key_type_rxrpc_s); 832 if (ret < 0) { 833 printk(KERN_CRIT "RxRPC: Cannot register server key type\n"); 834 goto error_key_type_s; 835 } 836 837 #ifdef CONFIG_PROC_FS 838 proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops); 839 proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops); 840 #endif 841 return 0; 842 843 error_key_type_s: 844 unregister_key_type(&key_type_rxrpc); 845 error_key_type: 846 sock_unregister(PF_RXRPC); 847 error_sock: 848 proto_unregister(&rxrpc_proto); 849 error_proto: 850 destroy_workqueue(rxrpc_workqueue); 851 error_work_queue: 852 kmem_cache_destroy(rxrpc_call_jar); 853 error_call_jar: 854 return ret; 855 } 856 857 /* 858 * unregister the RxRPC protocol 859 */ 860 static void __exit af_rxrpc_exit(void) 861 { 862 _enter(""); 863 unregister_key_type(&key_type_rxrpc_s); 864 unregister_key_type(&key_type_rxrpc); 865 sock_unregister(PF_RXRPC); 866 proto_unregister(&rxrpc_proto); 867 rxrpc_destroy_all_calls(); 868 rxrpc_destroy_all_connections(); 869 rxrpc_destroy_all_transports(); 870 rxrpc_destroy_all_peers(); 871 rxrpc_destroy_all_locals(); 872 873 ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); 874 875 _debug("flush scheduled work"); 876 flush_workqueue(rxrpc_workqueue); 877 proc_net_remove(&init_net, "rxrpc_conns"); 878 proc_net_remove(&init_net, "rxrpc_calls"); 879 destroy_workqueue(rxrpc_workqueue); 880 kmem_cache_destroy(rxrpc_call_jar); 881 _leave(""); 882 } 883 884 module_init(af_rxrpc_init); 885 module_exit(af_rxrpc_exit); 886