net/rxrpc/af_rxrpc.c

   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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/net.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/poll.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/key-type.h>
  22 #include <net/net_namespace.h>
  23 #include <net/sock.h>
  24 #include <net/af_rxrpc.h>
  25 #include "ar-internal.h"
  26
  27 MODULE_DESCRIPTION("RxRPC network protocol");
  28 MODULE_AUTHOR("Red Hat, Inc.");
  29 MODULE_LICENSE("GPL");
  30 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  31
  32 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  33 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
  34 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
  35
  36 static struct proto rxrpc_proto;
  37 static const struct proto_ops rxrpc_rpc_ops;
  38
  39 /* local epoch for detecting local-end reset */
  40 u32 rxrpc_epoch;
  41
  42 /* current debugging ID */
  43 atomic_t rxrpc_debug_id;
  44
  45 /* count of skbs currently in use */
  46 atomic_t rxrpc_n_skbs;
  47
  48 struct workqueue_struct *rxrpc_workqueue;
  49
  50 static void rxrpc_sock_destructor(struct sock *);
  51
  52 /*
  53  * see if an RxRPC socket is currently writable
  54  */
  55 static inline int rxrpc_writable(struct sock *sk)
  56 {
  57         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
  58 }
  59
  60 /*
  61  * wait for write bufferage to become available
  62  */
  63 static void rxrpc_write_space(struct sock *sk)
  64 {
  65         _enter("%p", sk);
  66         rcu_read_lock();
  67         if (rxrpc_writable(sk)) {
  68                 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
  69
  70                 if (skwq_has_sleeper(wq))
  71                         wake_up_interruptible(&wq->wait);
  72                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
  73         }
  74         rcu_read_unlock();
  75 }
  76
  77 /*
  78  * validate an RxRPC address
  79  */
  80 static int rxrpc_validate_address(struct rxrpc_sock *rx,
  81                                   struct sockaddr_rxrpc *srx,
  82                                   int len)
  83 {
  84         unsigned int tail;
  85
  86         if (len < sizeof(struct sockaddr_rxrpc))
  87                 return -EINVAL;
  88
  89         if (srx->srx_family != AF_RXRPC)
  90                 return -EAFNOSUPPORT;
  91
  92         if (srx->transport_type != SOCK_DGRAM)
  93                 return -ESOCKTNOSUPPORT;
  94
  95         len -= offsetof(struct sockaddr_rxrpc, transport);
  96         if (srx->transport_len < sizeof(sa_family_t) ||
  97             srx->transport_len > len)
  98                 return -EINVAL;
  99
 100         if (srx->transport.family != rx->proto)
 101                 return -EAFNOSUPPORT;
 102
 103         switch (srx->transport.family) {
 104         case AF_INET:
 105                 _debug("INET: %x @ %pI4",
 106                        ntohs(srx->transport.sin.sin_port),
 107                        &srx->transport.sin.sin_addr);
 108                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
 109                 break;
 110
 111         case AF_INET6:
 112         default:
 113                 return -EAFNOSUPPORT;
 114         }
 115
 116         if (tail < len)
 117                 memset((void *)srx + tail, 0, len - tail);
 118         return 0;
 119 }
 120
 121 /*
 122  * bind a local address to an RxRPC socket
 123  */
 124 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 125 {
 126         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
 127         struct sock *sk = sock->sk;
 128         struct rxrpc_local *local;
 129         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
 130         int ret;
 131
 132         _enter("%p,%p,%d", rx, saddr, len);
 133
 134         ret = rxrpc_validate_address(rx, srx, len);
 135         if (ret < 0)
 136                 goto error;
 137
 138         lock_sock(&rx->sk);
 139
 140         if (rx->sk.sk_state != RXRPC_UNBOUND) {
 141                 ret = -EINVAL;
 142                 goto error_unlock;
 143         }
 144
 145         memcpy(&rx->srx, srx, sizeof(rx->srx));
 146
 147         local = rxrpc_lookup_local(&rx->srx);
 148         if (IS_ERR(local)) {
 149                 ret = PTR_ERR(local);
 150                 goto error_unlock;
 151         }
 152
 153         if (rx->srx.srx_service) {
 154                 write_lock_bh(&local->services_lock);
 155                 list_for_each_entry(prx, &local->services, listen_link) {
 156                         if (prx->srx.srx_service == rx->srx.srx_service)
 157                                 goto service_in_use;
 158                 }
 159
 160                 rx->local = local;
 161                 list_add_tail(&rx->listen_link, &local->services);
 162                 write_unlock_bh(&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
 170         release_sock(&rx->sk);
 171         _leave(" = 0");
 172         return 0;
 173
 174 service_in_use:
 175         write_unlock_bh(&local->services_lock);
 176         rxrpc_put_local(local);
 177         ret = -EADDRINUSE;
 178 error_unlock:
 179         release_sock(&rx->sk);
 180 error:
 181         _leave(" = %d", ret);
 182         return ret;
 183 }
 184
 185 /*
 186  * set the number of pending calls permitted on a listening socket
 187  */
 188 static int rxrpc_listen(struct socket *sock, int backlog)
 189 {
 190         struct sock *sk = sock->sk;
 191         struct rxrpc_sock *rx = rxrpc_sk(sk);
 192         unsigned int max;
 193         int ret;
 194
 195         _enter("%p,%d", rx, backlog);
 196
 197         lock_sock(&rx->sk);
 198
 199         switch (rx->sk.sk_state) {
 200         case RXRPC_UNBOUND:
 201                 ret = -EADDRNOTAVAIL;
 202                 break;
 203         case RXRPC_SERVER_BOUND:
 204                 ASSERT(rx->local != NULL);
 205                 max = READ_ONCE(rxrpc_max_backlog);
 206                 ret = -EINVAL;
 207                 if (backlog == INT_MAX)
 208                         backlog = max;
 209                 else if (backlog < 0 || backlog > max)
 210                         break;
 211                 sk->sk_max_ack_backlog = backlog;
 212                 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 213                 ret = 0;
 214                 break;
 215         default:
 216                 ret = -EBUSY;
 217                 break;
 218         }
 219
 220         release_sock(&rx->sk);
 221         _leave(" = %d", ret);
 222         return ret;
 223 }
 224
 225 /*
 226  * find a transport by address
 227  */
 228 struct rxrpc_transport *rxrpc_name_to_transport(struct rxrpc_sock *rx,
 229                                                 struct sockaddr *addr,
 230                                                 int addr_len, int flags,
 231                                                 gfp_t gfp)
 232 {
 233         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 234         struct rxrpc_transport *trans;
 235         struct rxrpc_peer *peer;
 236
 237         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 238
 239         ASSERT(rx->local != NULL);
 240
 241         if (rx->srx.transport_type != srx->transport_type)
 242                 return ERR_PTR(-ESOCKTNOSUPPORT);
 243         if (rx->srx.transport.family != srx->transport.family)
 244                 return ERR_PTR(-EAFNOSUPPORT);
 245
 246         /* find a remote transport endpoint from the local one */
 247         peer = rxrpc_lookup_peer(rx->local, srx, gfp);
 248         if (IS_ERR(peer))
 249                 return ERR_CAST(peer);
 250
 251         /* find a transport */
 252         trans = rxrpc_get_transport(rx->local, peer, gfp);
 253         rxrpc_put_peer(peer);
 254         _leave(" = %p", trans);
 255         return trans;
 256 }
 257
 258 /**
 259  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 260  * @sock: The socket on which to make the call
 261  * @srx: The address of the peer to contact
 262  * @key: The security context to use (defaults to socket setting)
 263  * @user_call_ID: The ID to use
 264  *
 265  * Allow a kernel service to begin a call on the nominated socket.  This just
 266  * sets up all the internal tracking structures and allocates connection and
 267  * call IDs as appropriate.  The call to be used is returned.
 268  *
 269  * The default socket destination address and security may be overridden by
 270  * supplying @srx and @key.
 271  */
 272 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 273                                            struct sockaddr_rxrpc *srx,
 274                                            struct key *key,
 275                                            unsigned long user_call_ID,
 276                                            gfp_t gfp)
 277 {
 278         struct rxrpc_conn_bundle *bundle;
 279         struct rxrpc_transport *trans;
 280         struct rxrpc_call *call;
 281         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 282
 283         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 284
 285         lock_sock(&rx->sk);
 286
 287         trans = rxrpc_name_to_transport(rx, (struct sockaddr *)srx,
 288                                         sizeof(*srx), 0, gfp);
 289         if (IS_ERR(trans)) {
 290                 call = ERR_CAST(trans);
 291                 trans = NULL;
 292                 goto out_notrans;
 293         }
 294
 295         if (!key)
 296                 key = rx->key;
 297         if (key && !key->payload.data[0])
 298                 key = NULL; /* a no-security key */
 299
 300         bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, gfp);
 301         if (IS_ERR(bundle)) {
 302                 call = ERR_CAST(bundle);
 303                 goto out;
 304         }
 305
 306         call = rxrpc_new_client_call(rx, trans, bundle, user_call_ID, gfp);
 307         rxrpc_put_bundle(trans, bundle);
 308 out:
 309         rxrpc_put_transport(trans);
 310 out_notrans:
 311         release_sock(&rx->sk);
 312         _leave(" = %p", call);
 313         return call;
 314 }
 315 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 316
 317 /**
 318  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 319  * @call: The call to end
 320  *
 321  * Allow a kernel service to end a call it was using.  The call must be
 322  * complete before this is called (the call should be aborted if necessary).
 323  */
 324 void rxrpc_kernel_end_call(struct rxrpc_call *call)
 325 {
 326         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 327         rxrpc_remove_user_ID(call->socket, call);
 328         rxrpc_put_call(call);
 329 }
 330 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 331
 332 /**
 333  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
 334  * @sock: The socket to intercept received messages on
 335  * @interceptor: The function to pass the messages to
 336  *
 337  * Allow a kernel service to intercept messages heading for the Rx queue on an
 338  * RxRPC socket.  They get passed to the specified function instead.
 339  * @interceptor should free the socket buffers it is given.  @interceptor is
 340  * called with the socket receive queue spinlock held and softirqs disabled -
 341  * this ensures that the messages will be delivered in the right order.
 342  */
 343 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
 344                                         rxrpc_interceptor_t interceptor)
 345 {
 346         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 347
 348         _enter("");
 349         rx->interceptor = interceptor;
 350 }
 351
 352 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
 353
 354 /*
 355  * connect an RxRPC socket
 356  * - this just targets it at a specific destination; no actual connection
 357  *   negotiation takes place
 358  */
 359 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 360                          int addr_len, int flags)
 361 {
 362         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 363         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 364         int ret;
 365
 366         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 367
 368         ret = rxrpc_validate_address(rx, srx, addr_len);
 369         if (ret < 0) {
 370                 _leave(" = %d [bad addr]", ret);
 371                 return ret;
 372         }
 373
 374         lock_sock(&rx->sk);
 375
 376         ret = -EISCONN;
 377         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 378                 goto error;
 379
 380         switch (rx->sk.sk_state) {
 381         case RXRPC_UNBOUND:
 382                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 383         case RXRPC_CLIENT_UNBOUND:
 384         case RXRPC_CLIENT_BOUND:
 385                 break;
 386         default:
 387                 ret = -EBUSY;
 388                 goto error;
 389         }
 390
 391         rx->connect_srx = *srx;
 392         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 393         ret = 0;
 394
 395 error:
 396         release_sock(&rx->sk);
 397         return ret;
 398 }
 399
 400 /*
 401  * send a message through an RxRPC socket
 402  * - in a client this does a number of things:
 403  *   - finds/sets up a connection for the security specified (if any)
 404  *   - initiates a call (ID in control data)
 405  *   - ends the request phase of a call (if MSG_MORE is not set)
 406  *   - sends a call data packet
 407  *   - may send an abort (abort code in control data)
 408  */
 409 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 410 {
 411         struct rxrpc_local *local;
 412         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 413         int ret;
 414
 415         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 416
 417         if (m->msg_flags & MSG_OOB)
 418                 return -EOPNOTSUPP;
 419
 420         if (m->msg_name) {
 421                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 422                 if (ret < 0) {
 423                         _leave(" = %d [bad addr]", ret);
 424                         return ret;
 425                 }
 426         }
 427
 428         lock_sock(&rx->sk);
 429
 430         switch (rx->sk.sk_state) {
 431         case RXRPC_UNBOUND:
 432                 local = rxrpc_lookup_local(&rx->srx);
 433                 if (IS_ERR(local)) {
 434                         ret = PTR_ERR(local);
 435                         goto error_unlock;
 436                 }
 437
 438                 rx->local = local;
 439                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 440                 /* Fall through */
 441
 442         case RXRPC_CLIENT_UNBOUND:
 443         case RXRPC_CLIENT_BOUND:
 444                 if (!m->msg_name &&
 445                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 446                         m->msg_name = &rx->connect_srx;
 447                         m->msg_namelen = sizeof(rx->connect_srx);
 448                 }
 449         case RXRPC_SERVER_BOUND:
 450         case RXRPC_SERVER_LISTENING:
 451                 ret = rxrpc_do_sendmsg(rx, m, len);
 452                 break;
 453         default:
 454                 ret = -EINVAL;
 455                 break;
 456         }
 457
 458 error_unlock:
 459         release_sock(&rx->sk);
 460         _leave(" = %d", ret);
 461         return ret;
 462 }
 463
 464 /*
 465  * set RxRPC socket options
 466  */
 467 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 468                             char __user *optval, unsigned int optlen)
 469 {
 470         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 471         unsigned int min_sec_level;
 472         int ret;
 473
 474         _enter(",%d,%d,,%d", level, optname, optlen);
 475
 476         lock_sock(&rx->sk);
 477         ret = -EOPNOTSUPP;
 478
 479         if (level == SOL_RXRPC) {
 480                 switch (optname) {
 481                 case RXRPC_EXCLUSIVE_CONNECTION:
 482                         ret = -EINVAL;
 483                         if (optlen != 0)
 484                                 goto error;
 485                         ret = -EISCONN;
 486                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 487                                 goto error;
 488                         set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
 489                         goto success;
 490
 491                 case RXRPC_SECURITY_KEY:
 492                         ret = -EINVAL;
 493                         if (rx->key)
 494                                 goto error;
 495                         ret = -EISCONN;
 496                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 497                                 goto error;
 498                         ret = rxrpc_request_key(rx, optval, optlen);
 499                         goto error;
 500
 501                 case RXRPC_SECURITY_KEYRING:
 502                         ret = -EINVAL;
 503                         if (rx->key)
 504                                 goto error;
 505                         ret = -EISCONN;
 506                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 507                                 goto error;
 508                         ret = rxrpc_server_keyring(rx, optval, optlen);
 509                         goto error;
 510
 511                 case RXRPC_MIN_SECURITY_LEVEL:
 512                         ret = -EINVAL;
 513                         if (optlen != sizeof(unsigned int))
 514                                 goto error;
 515                         ret = -EISCONN;
 516                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 517                                 goto error;
 518                         ret = get_user(min_sec_level,
 519                                        (unsigned int __user *) optval);
 520                         if (ret < 0)
 521                                 goto error;
 522                         ret = -EINVAL;
 523                         if (min_sec_level > RXRPC_SECURITY_MAX)
 524                                 goto error;
 525                         rx->min_sec_level = min_sec_level;
 526                         goto success;
 527
 528                 default:
 529                         break;
 530                 }
 531         }
 532
 533 success:
 534         ret = 0;
 535 error:
 536         release_sock(&rx->sk);
 537         return ret;
 538 }
 539
 540 /*
 541  * permit an RxRPC socket to be polled
 542  */
 543 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 544                                poll_table *wait)
 545 {
 546         unsigned int mask;
 547         struct sock *sk = sock->sk;
 548
 549         sock_poll_wait(file, sk_sleep(sk), wait);
 550         mask = 0;
 551
 552         /* the socket is readable if there are any messages waiting on the Rx
 553          * queue */
 554         if (!skb_queue_empty(&sk->sk_receive_queue))
 555                 mask |= POLLIN | POLLRDNORM;
 556
 557         /* the socket is writable if there is space to add new data to the
 558          * socket; there is no guarantee that any particular call in progress
 559          * on the socket may have space in the Tx ACK window */
 560         if (rxrpc_writable(sk))
 561                 mask |= POLLOUT | POLLWRNORM;
 562
 563         return mask;
 564 }
 565
 566 /*
 567  * create an RxRPC socket
 568  */
 569 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 570                         int kern)
 571 {
 572         struct rxrpc_sock *rx;
 573         struct sock *sk;
 574
 575         _enter("%p,%d", sock, protocol);
 576
 577         if (!net_eq(net, &init_net))
 578                 return -EAFNOSUPPORT;
 579
 580         /* we support transport protocol UDP/UDP6 only */
 581         if (protocol != PF_INET)
 582                 return -EPROTONOSUPPORT;
 583
 584         if (sock->type != SOCK_DGRAM)
 585                 return -ESOCKTNOSUPPORT;
 586
 587         sock->ops = &rxrpc_rpc_ops;
 588         sock->state = SS_UNCONNECTED;
 589
 590         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 591         if (!sk)
 592                 return -ENOMEM;
 593
 594         sock_init_data(sock, sk);
 595         sk->sk_state            = RXRPC_UNBOUND;
 596         sk->sk_write_space      = rxrpc_write_space;
 597         sk->sk_max_ack_backlog  = 0;
 598         sk->sk_destruct         = rxrpc_sock_destructor;
 599
 600         rx = rxrpc_sk(sk);
 601         rx->proto = protocol;
 602         rx->calls = RB_ROOT;
 603
 604         INIT_LIST_HEAD(&rx->listen_link);
 605         INIT_LIST_HEAD(&rx->secureq);
 606         INIT_LIST_HEAD(&rx->acceptq);
 607         rwlock_init(&rx->call_lock);
 608         memset(&rx->srx, 0, sizeof(rx->srx));
 609
 610         _leave(" = 0 [%p]", rx);
 611         return 0;
 612 }
 613
 614 /*
 615  * RxRPC socket destructor
 616  */
 617 static void rxrpc_sock_destructor(struct sock *sk)
 618 {
 619         _enter("%p", sk);
 620
 621         rxrpc_purge_queue(&sk->sk_receive_queue);
 622
 623         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 624         WARN_ON(!sk_unhashed(sk));
 625         WARN_ON(sk->sk_socket);
 626
 627         if (!sock_flag(sk, SOCK_DEAD)) {
 628                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 629                 return;
 630         }
 631 }
 632
 633 /*
 634  * release an RxRPC socket
 635  */
 636 static int rxrpc_release_sock(struct sock *sk)
 637 {
 638         struct rxrpc_sock *rx = rxrpc_sk(sk);
 639
 640         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 641
 642         /* declare the socket closed for business */
 643         sock_orphan(sk);
 644         sk->sk_shutdown = SHUTDOWN_MASK;
 645
 646         spin_lock_bh(&sk->sk_receive_queue.lock);
 647         sk->sk_state = RXRPC_CLOSE;
 648         spin_unlock_bh(&sk->sk_receive_queue.lock);
 649
 650         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 651
 652         if (!list_empty(&rx->listen_link)) {
 653                 write_lock_bh(&rx->local->services_lock);
 654                 list_del(&rx->listen_link);
 655                 write_unlock_bh(&rx->local->services_lock);
 656         }
 657
 658         /* try to flush out this socket */
 659         rxrpc_release_calls_on_socket(rx);
 660         flush_workqueue(rxrpc_workqueue);
 661         rxrpc_purge_queue(&sk->sk_receive_queue);
 662
 663         if (rx->conn) {
 664                 rxrpc_put_connection(rx->conn);
 665                 rx->conn = NULL;
 666         }
 667
 668         if (rx->local) {
 669                 rxrpc_put_local(rx->local);
 670                 rx->local = NULL;
 671         }
 672
 673         key_put(rx->key);
 674         rx->key = NULL;
 675         key_put(rx->securities);
 676         rx->securities = NULL;
 677         sock_put(sk);
 678
 679         _leave(" = 0");
 680         return 0;
 681 }
 682
 683 /*
 684  * release an RxRPC BSD socket on close() or equivalent
 685  */
 686 static int rxrpc_release(struct socket *sock)
 687 {
 688         struct sock *sk = sock->sk;
 689
 690         _enter("%p{%p}", sock, sk);
 691
 692         if (!sk)
 693                 return 0;
 694
 695         sock->sk = NULL;
 696
 697         return rxrpc_release_sock(sk);
 698 }
 699
 700 /*
 701  * RxRPC network protocol
 702  */
 703 static const struct proto_ops rxrpc_rpc_ops = {
 704         .family         = PF_RXRPC,
 705         .owner          = THIS_MODULE,
 706         .release        = rxrpc_release,
 707         .bind           = rxrpc_bind,
 708         .connect        = rxrpc_connect,
 709         .socketpair     = sock_no_socketpair,
 710         .accept         = sock_no_accept,
 711         .getname        = sock_no_getname,
 712         .poll           = rxrpc_poll,
 713         .ioctl          = sock_no_ioctl,
 714         .listen         = rxrpc_listen,
 715         .shutdown       = sock_no_shutdown,
 716         .setsockopt     = rxrpc_setsockopt,
 717         .getsockopt     = sock_no_getsockopt,
 718         .sendmsg        = rxrpc_sendmsg,
 719         .recvmsg        = rxrpc_recvmsg,
 720         .mmap           = sock_no_mmap,
 721         .sendpage       = sock_no_sendpage,
 722 };
 723
 724 static struct proto rxrpc_proto = {
 725         .name           = "RXRPC",
 726         .owner          = THIS_MODULE,
 727         .obj_size       = sizeof(struct rxrpc_sock),
 728         .max_header     = sizeof(struct rxrpc_wire_header),
 729 };
 730
 731 static const struct net_proto_family rxrpc_family_ops = {
 732         .family = PF_RXRPC,
 733         .create = rxrpc_create,
 734         .owner  = THIS_MODULE,
 735 };
 736
 737 /*
 738  * initialise and register the RxRPC protocol
 739  */
 740 static int __init af_rxrpc_init(void)
 741 {
 742         int ret = -1;
 743
 744         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 745
 746         rxrpc_epoch = get_seconds();
 747
 748         ret = -ENOMEM;
 749         rxrpc_call_jar = kmem_cache_create(
 750                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 751                 SLAB_HWCACHE_ALIGN, NULL);
 752         if (!rxrpc_call_jar) {
 753                 pr_notice("Failed to allocate call jar\n");
 754                 goto error_call_jar;
 755         }
 756
 757         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 758         if (!rxrpc_workqueue) {
 759                 pr_notice("Failed to allocate work queue\n");
 760                 goto error_work_queue;
 761         }
 762
 763         ret = rxrpc_init_security();
 764         if (ret < 0) {
 765                 pr_crit("Cannot initialise security\n");
 766                 goto error_security;
 767         }
 768
 769         ret = proto_register(&rxrpc_proto, 1);
 770         if (ret < 0) {
 771                 pr_crit("Cannot register protocol\n");
 772                 goto error_proto;
 773         }
 774
 775         ret = sock_register(&rxrpc_family_ops);
 776         if (ret < 0) {
 777                 pr_crit("Cannot register socket family\n");
 778                 goto error_sock;
 779         }
 780
 781         ret = register_key_type(&key_type_rxrpc);
 782         if (ret < 0) {
 783                 pr_crit("Cannot register client key type\n");
 784                 goto error_key_type;
 785         }
 786
 787         ret = register_key_type(&key_type_rxrpc_s);
 788         if (ret < 0) {
 789                 pr_crit("Cannot register server key type\n");
 790                 goto error_key_type_s;
 791         }
 792
 793         ret = rxrpc_sysctl_init();
 794         if (ret < 0) {
 795                 pr_crit("Cannot register sysctls\n");
 796                 goto error_sysctls;
 797         }
 798
 799 #ifdef CONFIG_PROC_FS
 800         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
 801         proc_create("rxrpc_conns", 0, init_net.proc_net,
 802                     &rxrpc_connection_seq_fops);
 803 #endif
 804         return 0;
 805
 806 error_sysctls:
 807         unregister_key_type(&key_type_rxrpc_s);
 808 error_key_type_s:
 809         unregister_key_type(&key_type_rxrpc);
 810 error_key_type:
 811         sock_unregister(PF_RXRPC);
 812 error_sock:
 813         proto_unregister(&rxrpc_proto);
 814 error_proto:
 815         destroy_workqueue(rxrpc_workqueue);
 816 error_security:
 817         rxrpc_exit_security();
 818 error_work_queue:
 819         kmem_cache_destroy(rxrpc_call_jar);
 820 error_call_jar:
 821         return ret;
 822 }
 823
 824 /*
 825  * unregister the RxRPC protocol
 826  */
 827 static void __exit af_rxrpc_exit(void)
 828 {
 829         _enter("");
 830         rxrpc_sysctl_exit();
 831         unregister_key_type(&key_type_rxrpc_s);
 832         unregister_key_type(&key_type_rxrpc);
 833         sock_unregister(PF_RXRPC);
 834         proto_unregister(&rxrpc_proto);
 835         rxrpc_destroy_all_calls();
 836         rxrpc_destroy_all_connections();
 837         rxrpc_destroy_all_transports();
 838         rxrpc_destroy_all_locals();
 839
 840         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 841
 842         _debug("flush scheduled work");
 843         flush_workqueue(rxrpc_workqueue);
 844         remove_proc_entry("rxrpc_conns", init_net.proc_net);
 845         remove_proc_entry("rxrpc_calls", init_net.proc_net);
 846         destroy_workqueue(rxrpc_workqueue);
 847         rxrpc_exit_security();
 848         kmem_cache_destroy(rxrpc_call_jar);
 849         _leave("");
 850 }
 851
 852 module_init(af_rxrpc_init);
 853 module_exit(af_rxrpc_exit);