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