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 #define CREATE_TRACE_POINTS
  26 #include "ar-internal.h"
  27
  28 MODULE_DESCRIPTION("RxRPC network protocol");
  29 MODULE_AUTHOR("Red Hat, Inc.");
  30 MODULE_LICENSE("GPL");
  31 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  32
  33 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  34 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
  35 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
  36
  37 static struct proto rxrpc_proto;
  38 static const struct proto_ops rxrpc_rpc_ops;
  39
  40 /* local epoch for detecting local-end reset */
  41 u32 rxrpc_epoch;
  42
  43 /* current debugging ID */
  44 atomic_t rxrpc_debug_id;
  45
  46 /* count of skbs currently in use */
  47 atomic_t rxrpc_n_skbs;
  48
  49 struct workqueue_struct *rxrpc_workqueue;
  50
  51 static void rxrpc_sock_destructor(struct sock *);
  52
  53 /*
  54  * see if an RxRPC socket is currently writable
  55  */
  56 static inline int rxrpc_writable(struct sock *sk)
  57 {
  58         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
  59 }
  60
  61 /*
  62  * wait for write bufferage to become available
  63  */
  64 static void rxrpc_write_space(struct sock *sk)
  65 {
  66         _enter("%p", sk);
  67         rcu_read_lock();
  68         if (rxrpc_writable(sk)) {
  69                 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
  70
  71                 if (skwq_has_sleeper(wq))
  72                         wake_up_interruptible(&wq->wait);
  73                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
  74         }
  75         rcu_read_unlock();
  76 }
  77
  78 /*
  79  * validate an RxRPC address
  80  */
  81 static int rxrpc_validate_address(struct rxrpc_sock *rx,
  82                                   struct sockaddr_rxrpc *srx,
  83                                   int len)
  84 {
  85         unsigned int tail;
  86
  87         if (len < sizeof(struct sockaddr_rxrpc))
  88                 return -EINVAL;
  89
  90         if (srx->srx_family != AF_RXRPC)
  91                 return -EAFNOSUPPORT;
  92
  93         if (srx->transport_type != SOCK_DGRAM)
  94                 return -ESOCKTNOSUPPORT;
  95
  96         len -= offsetof(struct sockaddr_rxrpc, transport);
  97         if (srx->transport_len < sizeof(sa_family_t) ||
  98             srx->transport_len > len)
  99                 return -EINVAL;
 100
 101         if (srx->transport.family != rx->family)
 102                 return -EAFNOSUPPORT;
 103
 104         switch (srx->transport.family) {
 105         case AF_INET:
 106                 if (srx->transport_len < sizeof(struct sockaddr_in))
 107                         return -EINVAL;
 108                 _debug("INET: %x @ %pI4",
 109                        ntohs(srx->transport.sin.sin_port),
 110                        &srx->transport.sin.sin_addr);
 111                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
 112                 break;
 113
 114         case AF_INET6:
 115         default:
 116                 return -EAFNOSUPPORT;
 117         }
 118
 119         if (tail < len)
 120                 memset((void *)srx + tail, 0, len - tail);
 121         return 0;
 122 }
 123
 124 /*
 125  * bind a local address to an RxRPC socket
 126  */
 127 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 128 {
 129         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
 130         struct sock *sk = sock->sk;
 131         struct rxrpc_local *local;
 132         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
 133         int ret;
 134
 135         _enter("%p,%p,%d", rx, saddr, len);
 136
 137         ret = rxrpc_validate_address(rx, srx, len);
 138         if (ret < 0)
 139                 goto error;
 140
 141         lock_sock(&rx->sk);
 142
 143         if (rx->sk.sk_state != RXRPC_UNBOUND) {
 144                 ret = -EINVAL;
 145                 goto error_unlock;
 146         }
 147
 148         memcpy(&rx->srx, srx, sizeof(rx->srx));
 149
 150         local = rxrpc_lookup_local(&rx->srx);
 151         if (IS_ERR(local)) {
 152                 ret = PTR_ERR(local);
 153                 goto error_unlock;
 154         }
 155
 156         if (rx->srx.srx_service) {
 157                 write_lock_bh(&local->services_lock);
 158                 list_for_each_entry(prx, &local->services, listen_link) {
 159                         if (prx->srx.srx_service == rx->srx.srx_service)
 160                                 goto service_in_use;
 161                 }
 162
 163                 rx->local = local;
 164                 list_add_tail(&rx->listen_link, &local->services);
 165                 write_unlock_bh(&local->services_lock);
 166
 167                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
 168         } else {
 169                 rx->local = local;
 170                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 171         }
 172
 173         release_sock(&rx->sk);
 174         _leave(" = 0");
 175         return 0;
 176
 177 service_in_use:
 178         write_unlock_bh(&local->services_lock);
 179         rxrpc_put_local(local);
 180         ret = -EADDRINUSE;
 181 error_unlock:
 182         release_sock(&rx->sk);
 183 error:
 184         _leave(" = %d", ret);
 185         return ret;
 186 }
 187
 188 /*
 189  * set the number of pending calls permitted on a listening socket
 190  */
 191 static int rxrpc_listen(struct socket *sock, int backlog)
 192 {
 193         struct sock *sk = sock->sk;
 194         struct rxrpc_sock *rx = rxrpc_sk(sk);
 195         unsigned int max;
 196         int ret;
 197
 198         _enter("%p,%d", rx, backlog);
 199
 200         lock_sock(&rx->sk);
 201
 202         switch (rx->sk.sk_state) {
 203         case RXRPC_UNBOUND:
 204                 ret = -EADDRNOTAVAIL;
 205                 break;
 206         case RXRPC_SERVER_BOUND:
 207                 ASSERT(rx->local != NULL);
 208                 max = READ_ONCE(rxrpc_max_backlog);
 209                 ret = -EINVAL;
 210                 if (backlog == INT_MAX)
 211                         backlog = max;
 212                 else if (backlog < 0 || backlog > max)
 213                         break;
 214                 sk->sk_max_ack_backlog = backlog;
 215                 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 216                 ret = 0;
 217                 break;
 218         default:
 219                 ret = -EBUSY;
 220                 break;
 221         }
 222
 223         release_sock(&rx->sk);
 224         _leave(" = %d", ret);
 225         return ret;
 226 }
 227
 228 /**
 229  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 230  * @sock: The socket on which to make the call
 231  * @srx: The address of the peer to contact
 232  * @key: The security context to use (defaults to socket setting)
 233  * @user_call_ID: The ID to use
 234  *
 235  * Allow a kernel service to begin a call on the nominated socket.  This just
 236  * sets up all the internal tracking structures and allocates connection and
 237  * call IDs as appropriate.  The call to be used is returned.
 238  *
 239  * The default socket destination address and security may be overridden by
 240  * supplying @srx and @key.
 241  */
 242 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 243                                            struct sockaddr_rxrpc *srx,
 244                                            struct key *key,
 245                                            unsigned long user_call_ID,
 246                                            gfp_t gfp)
 247 {
 248         struct rxrpc_conn_parameters cp;
 249         struct rxrpc_call *call;
 250         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 251         int ret;
 252
 253         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 254
 255         ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
 256         if (ret < 0)
 257                 return ERR_PTR(ret);
 258
 259         lock_sock(&rx->sk);
 260
 261         if (!key)
 262                 key = rx->key;
 263         if (key && !key->payload.data[0])
 264                 key = NULL; /* a no-security key */
 265
 266         memset(&cp, 0, sizeof(cp));
 267         cp.local                = rx->local;
 268         cp.key                  = key;
 269         cp.security_level       = 0;
 270         cp.exclusive            = false;
 271         cp.service_id           = srx->srx_service;
 272         call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
 273
 274         release_sock(&rx->sk);
 275         _leave(" = %p", call);
 276         return call;
 277 }
 278 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 279
 280 /**
 281  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 282  * @call: The call to end
 283  *
 284  * Allow a kernel service to end a call it was using.  The call must be
 285  * complete before this is called (the call should be aborted if necessary).
 286  */
 287 void rxrpc_kernel_end_call(struct rxrpc_call *call)
 288 {
 289         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 290         rxrpc_remove_user_ID(call->socket, call);
 291         rxrpc_put_call(call);
 292 }
 293 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 294
 295 /**
 296  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
 297  * @sock: The socket to intercept received messages on
 298  * @interceptor: The function to pass the messages to
 299  *
 300  * Allow a kernel service to intercept messages heading for the Rx queue on an
 301  * RxRPC socket.  They get passed to the specified function instead.
 302  * @interceptor should free the socket buffers it is given.  @interceptor is
 303  * called with the socket receive queue spinlock held and softirqs disabled -
 304  * this ensures that the messages will be delivered in the right order.
 305  */
 306 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
 307                                         rxrpc_interceptor_t interceptor)
 308 {
 309         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 310
 311         _enter("");
 312         rx->interceptor = interceptor;
 313 }
 314
 315 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
 316
 317 /*
 318  * connect an RxRPC socket
 319  * - this just targets it at a specific destination; no actual connection
 320  *   negotiation takes place
 321  */
 322 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 323                          int addr_len, int flags)
 324 {
 325         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 326         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 327         int ret;
 328
 329         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 330
 331         ret = rxrpc_validate_address(rx, srx, addr_len);
 332         if (ret < 0) {
 333                 _leave(" = %d [bad addr]", ret);
 334                 return ret;
 335         }
 336
 337         lock_sock(&rx->sk);
 338
 339         ret = -EISCONN;
 340         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 341                 goto error;
 342
 343         switch (rx->sk.sk_state) {
 344         case RXRPC_UNBOUND:
 345                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 346         case RXRPC_CLIENT_UNBOUND:
 347         case RXRPC_CLIENT_BOUND:
 348                 break;
 349         default:
 350                 ret = -EBUSY;
 351                 goto error;
 352         }
 353
 354         rx->connect_srx = *srx;
 355         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 356         ret = 0;
 357
 358 error:
 359         release_sock(&rx->sk);
 360         return ret;
 361 }
 362
 363 /*
 364  * send a message through an RxRPC socket
 365  * - in a client this does a number of things:
 366  *   - finds/sets up a connection for the security specified (if any)
 367  *   - initiates a call (ID in control data)
 368  *   - ends the request phase of a call (if MSG_MORE is not set)
 369  *   - sends a call data packet
 370  *   - may send an abort (abort code in control data)
 371  */
 372 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 373 {
 374         struct rxrpc_local *local;
 375         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 376         int ret;
 377
 378         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 379
 380         if (m->msg_flags & MSG_OOB)
 381                 return -EOPNOTSUPP;
 382
 383         if (m->msg_name) {
 384                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 385                 if (ret < 0) {
 386                         _leave(" = %d [bad addr]", ret);
 387                         return ret;
 388                 }
 389         }
 390
 391         lock_sock(&rx->sk);
 392
 393         switch (rx->sk.sk_state) {
 394         case RXRPC_UNBOUND:
 395                 local = rxrpc_lookup_local(&rx->srx);
 396                 if (IS_ERR(local)) {
 397                         ret = PTR_ERR(local);
 398                         goto error_unlock;
 399                 }
 400
 401                 rx->local = local;
 402                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 403                 /* Fall through */
 404
 405         case RXRPC_CLIENT_UNBOUND:
 406         case RXRPC_CLIENT_BOUND:
 407                 if (!m->msg_name &&
 408                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 409                         m->msg_name = &rx->connect_srx;
 410                         m->msg_namelen = sizeof(rx->connect_srx);
 411                 }
 412         case RXRPC_SERVER_BOUND:
 413         case RXRPC_SERVER_LISTENING:
 414                 ret = rxrpc_do_sendmsg(rx, m, len);
 415                 break;
 416         default:
 417                 ret = -EINVAL;
 418                 break;
 419         }
 420
 421 error_unlock:
 422         release_sock(&rx->sk);
 423         _leave(" = %d", ret);
 424         return ret;
 425 }
 426
 427 /*
 428  * set RxRPC socket options
 429  */
 430 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 431                             char __user *optval, unsigned int optlen)
 432 {
 433         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 434         unsigned int min_sec_level;
 435         int ret;
 436
 437         _enter(",%d,%d,,%d", level, optname, optlen);
 438
 439         lock_sock(&rx->sk);
 440         ret = -EOPNOTSUPP;
 441
 442         if (level == SOL_RXRPC) {
 443                 switch (optname) {
 444                 case RXRPC_EXCLUSIVE_CONNECTION:
 445                         ret = -EINVAL;
 446                         if (optlen != 0)
 447                                 goto error;
 448                         ret = -EISCONN;
 449                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 450                                 goto error;
 451                         rx->exclusive = true;
 452                         goto success;
 453
 454                 case RXRPC_SECURITY_KEY:
 455                         ret = -EINVAL;
 456                         if (rx->key)
 457                                 goto error;
 458                         ret = -EISCONN;
 459                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 460                                 goto error;
 461                         ret = rxrpc_request_key(rx, optval, optlen);
 462                         goto error;
 463
 464                 case RXRPC_SECURITY_KEYRING:
 465                         ret = -EINVAL;
 466                         if (rx->key)
 467                                 goto error;
 468                         ret = -EISCONN;
 469                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 470                                 goto error;
 471                         ret = rxrpc_server_keyring(rx, optval, optlen);
 472                         goto error;
 473
 474                 case RXRPC_MIN_SECURITY_LEVEL:
 475                         ret = -EINVAL;
 476                         if (optlen != sizeof(unsigned int))
 477                                 goto error;
 478                         ret = -EISCONN;
 479                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 480                                 goto error;
 481                         ret = get_user(min_sec_level,
 482                                        (unsigned int __user *) optval);
 483                         if (ret < 0)
 484                                 goto error;
 485                         ret = -EINVAL;
 486                         if (min_sec_level > RXRPC_SECURITY_MAX)
 487                                 goto error;
 488                         rx->min_sec_level = min_sec_level;
 489                         goto success;
 490
 491                 default:
 492                         break;
 493                 }
 494         }
 495
 496 success:
 497         ret = 0;
 498 error:
 499         release_sock(&rx->sk);
 500         return ret;
 501 }
 502
 503 /*
 504  * permit an RxRPC socket to be polled
 505  */
 506 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 507                                poll_table *wait)
 508 {
 509         unsigned int mask;
 510         struct sock *sk = sock->sk;
 511
 512         sock_poll_wait(file, sk_sleep(sk), wait);
 513         mask = 0;
 514
 515         /* the socket is readable if there are any messages waiting on the Rx
 516          * queue */
 517         if (!skb_queue_empty(&sk->sk_receive_queue))
 518                 mask |= POLLIN | POLLRDNORM;
 519
 520         /* the socket is writable if there is space to add new data to the
 521          * socket; there is no guarantee that any particular call in progress
 522          * on the socket may have space in the Tx ACK window */
 523         if (rxrpc_writable(sk))
 524                 mask |= POLLOUT | POLLWRNORM;
 525
 526         return mask;
 527 }
 528
 529 /*
 530  * create an RxRPC socket
 531  */
 532 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 533                         int kern)
 534 {
 535         struct rxrpc_sock *rx;
 536         struct sock *sk;
 537
 538         _enter("%p,%d", sock, protocol);
 539
 540         if (!net_eq(net, &init_net))
 541                 return -EAFNOSUPPORT;
 542
 543         /* we support transport protocol UDP/UDP6 only */
 544         if (protocol != PF_INET)
 545                 return -EPROTONOSUPPORT;
 546
 547         if (sock->type != SOCK_DGRAM)
 548                 return -ESOCKTNOSUPPORT;
 549
 550         sock->ops = &rxrpc_rpc_ops;
 551         sock->state = SS_UNCONNECTED;
 552
 553         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 554         if (!sk)
 555                 return -ENOMEM;
 556
 557         sock_init_data(sock, sk);
 558         sk->sk_state            = RXRPC_UNBOUND;
 559         sk->sk_write_space      = rxrpc_write_space;
 560         sk->sk_max_ack_backlog  = 0;
 561         sk->sk_destruct         = rxrpc_sock_destructor;
 562
 563         rx = rxrpc_sk(sk);
 564         rx->family = protocol;
 565         rx->calls = RB_ROOT;
 566
 567         INIT_LIST_HEAD(&rx->listen_link);
 568         INIT_LIST_HEAD(&rx->secureq);
 569         INIT_LIST_HEAD(&rx->acceptq);
 570         rwlock_init(&rx->call_lock);
 571         memset(&rx->srx, 0, sizeof(rx->srx));
 572
 573         _leave(" = 0 [%p]", rx);
 574         return 0;
 575 }
 576
 577 /*
 578  * RxRPC socket destructor
 579  */
 580 static void rxrpc_sock_destructor(struct sock *sk)
 581 {
 582         _enter("%p", sk);
 583
 584         rxrpc_purge_queue(&sk->sk_receive_queue);
 585
 586         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 587         WARN_ON(!sk_unhashed(sk));
 588         WARN_ON(sk->sk_socket);
 589
 590         if (!sock_flag(sk, SOCK_DEAD)) {
 591                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 592                 return;
 593         }
 594 }
 595
 596 /*
 597  * release an RxRPC socket
 598  */
 599 static int rxrpc_release_sock(struct sock *sk)
 600 {
 601         struct rxrpc_sock *rx = rxrpc_sk(sk);
 602
 603         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 604
 605         /* declare the socket closed for business */
 606         sock_orphan(sk);
 607         sk->sk_shutdown = SHUTDOWN_MASK;
 608
 609         spin_lock_bh(&sk->sk_receive_queue.lock);
 610         sk->sk_state = RXRPC_CLOSE;
 611         spin_unlock_bh(&sk->sk_receive_queue.lock);
 612
 613         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 614
 615         if (!list_empty(&rx->listen_link)) {
 616                 write_lock_bh(&rx->local->services_lock);
 617                 list_del(&rx->listen_link);
 618                 write_unlock_bh(&rx->local->services_lock);
 619         }
 620
 621         /* try to flush out this socket */
 622         rxrpc_release_calls_on_socket(rx);
 623         flush_workqueue(rxrpc_workqueue);
 624         rxrpc_purge_queue(&sk->sk_receive_queue);
 625
 626         rxrpc_put_local(rx->local);
 627         rx->local = NULL;
 628         key_put(rx->key);
 629         rx->key = NULL;
 630         key_put(rx->securities);
 631         rx->securities = NULL;
 632         sock_put(sk);
 633
 634         _leave(" = 0");
 635         return 0;
 636 }
 637
 638 /*
 639  * release an RxRPC BSD socket on close() or equivalent
 640  */
 641 static int rxrpc_release(struct socket *sock)
 642 {
 643         struct sock *sk = sock->sk;
 644
 645         _enter("%p{%p}", sock, sk);
 646
 647         if (!sk)
 648                 return 0;
 649
 650         sock->sk = NULL;
 651
 652         return rxrpc_release_sock(sk);
 653 }
 654
 655 /*
 656  * RxRPC network protocol
 657  */
 658 static const struct proto_ops rxrpc_rpc_ops = {
 659         .family         = PF_RXRPC,
 660         .owner          = THIS_MODULE,
 661         .release        = rxrpc_release,
 662         .bind           = rxrpc_bind,
 663         .connect        = rxrpc_connect,
 664         .socketpair     = sock_no_socketpair,
 665         .accept         = sock_no_accept,
 666         .getname        = sock_no_getname,
 667         .poll           = rxrpc_poll,
 668         .ioctl          = sock_no_ioctl,
 669         .listen         = rxrpc_listen,
 670         .shutdown       = sock_no_shutdown,
 671         .setsockopt     = rxrpc_setsockopt,
 672         .getsockopt     = sock_no_getsockopt,
 673         .sendmsg        = rxrpc_sendmsg,
 674         .recvmsg        = rxrpc_recvmsg,
 675         .mmap           = sock_no_mmap,
 676         .sendpage       = sock_no_sendpage,
 677 };
 678
 679 static struct proto rxrpc_proto = {
 680         .name           = "RXRPC",
 681         .owner          = THIS_MODULE,
 682         .obj_size       = sizeof(struct rxrpc_sock),
 683         .max_header     = sizeof(struct rxrpc_wire_header),
 684 };
 685
 686 static const struct net_proto_family rxrpc_family_ops = {
 687         .family = PF_RXRPC,
 688         .create = rxrpc_create,
 689         .owner  = THIS_MODULE,
 690 };
 691
 692 /*
 693  * initialise and register the RxRPC protocol
 694  */
 695 static int __init af_rxrpc_init(void)
 696 {
 697         int ret = -1;
 698
 699         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 700
 701         rxrpc_epoch = get_seconds();
 702
 703         ret = -ENOMEM;
 704         rxrpc_call_jar = kmem_cache_create(
 705                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 706                 SLAB_HWCACHE_ALIGN, NULL);
 707         if (!rxrpc_call_jar) {
 708                 pr_notice("Failed to allocate call jar\n");
 709                 goto error_call_jar;
 710         }
 711
 712         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 713         if (!rxrpc_workqueue) {
 714                 pr_notice("Failed to allocate work queue\n");
 715                 goto error_work_queue;
 716         }
 717
 718         ret = rxrpc_init_security();
 719         if (ret < 0) {
 720                 pr_crit("Cannot initialise security\n");
 721                 goto error_security;
 722         }
 723
 724         ret = proto_register(&rxrpc_proto, 1);
 725         if (ret < 0) {
 726                 pr_crit("Cannot register protocol\n");
 727                 goto error_proto;
 728         }
 729
 730         ret = sock_register(&rxrpc_family_ops);
 731         if (ret < 0) {
 732                 pr_crit("Cannot register socket family\n");
 733                 goto error_sock;
 734         }
 735
 736         ret = register_key_type(&key_type_rxrpc);
 737         if (ret < 0) {
 738                 pr_crit("Cannot register client key type\n");
 739                 goto error_key_type;
 740         }
 741
 742         ret = register_key_type(&key_type_rxrpc_s);
 743         if (ret < 0) {
 744                 pr_crit("Cannot register server key type\n");
 745                 goto error_key_type_s;
 746         }
 747
 748         ret = rxrpc_sysctl_init();
 749         if (ret < 0) {
 750                 pr_crit("Cannot register sysctls\n");
 751                 goto error_sysctls;
 752         }
 753
 754 #ifdef CONFIG_PROC_FS
 755         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
 756         proc_create("rxrpc_conns", 0, init_net.proc_net,
 757                     &rxrpc_connection_seq_fops);
 758 #endif
 759         return 0;
 760
 761 error_sysctls:
 762         unregister_key_type(&key_type_rxrpc_s);
 763 error_key_type_s:
 764         unregister_key_type(&key_type_rxrpc);
 765 error_key_type:
 766         sock_unregister(PF_RXRPC);
 767 error_sock:
 768         proto_unregister(&rxrpc_proto);
 769 error_proto:
 770         rxrpc_exit_security();
 771 error_security:
 772         destroy_workqueue(rxrpc_workqueue);
 773 error_work_queue:
 774         kmem_cache_destroy(rxrpc_call_jar);
 775 error_call_jar:
 776         return ret;
 777 }
 778
 779 /*
 780  * unregister the RxRPC protocol
 781  */
 782 static void __exit af_rxrpc_exit(void)
 783 {
 784         _enter("");
 785         rxrpc_sysctl_exit();
 786         unregister_key_type(&key_type_rxrpc_s);
 787         unregister_key_type(&key_type_rxrpc);
 788         sock_unregister(PF_RXRPC);
 789         proto_unregister(&rxrpc_proto);
 790         rxrpc_destroy_all_calls();
 791         rxrpc_destroy_all_connections();
 792         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 793         rxrpc_destroy_all_locals();
 794
 795         remove_proc_entry("rxrpc_conns", init_net.proc_net);
 796         remove_proc_entry("rxrpc_calls", init_net.proc_net);
 797         destroy_workqueue(rxrpc_workqueue);
 798         rxrpc_exit_security();
 799         kmem_cache_destroy(rxrpc_call_jar);
 800         _leave("");
 801 }
 802
 803 module_init(af_rxrpc_init);
 804 module_exit(af_rxrpc_exit);