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  * @sock: The socket the call is on
 283  * @call: The call to end
 284  *
 285  * Allow a kernel service to end a call it was using.  The call must be
 286  * complete before this is called (the call should be aborted if necessary).
 287  */
 288 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
 289 {
 290         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 291         rxrpc_remove_user_ID(rxrpc_sk(sock->sk), call);
 292         rxrpc_put_call(call);
 293 }
 294 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 295
 296 /**
 297  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
 298  * @sock: The socket to intercept received messages on
 299  * @interceptor: The function to pass the messages to
 300  *
 301  * Allow a kernel service to intercept messages heading for the Rx queue on an
 302  * RxRPC socket.  They get passed to the specified function instead.
 303  * @interceptor should free the socket buffers it is given.  @interceptor is
 304  * called with the socket receive queue spinlock held and softirqs disabled -
 305  * this ensures that the messages will be delivered in the right order.
 306  */
 307 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
 308                                         rxrpc_interceptor_t interceptor)
 309 {
 310         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 311
 312         _enter("");
 313         rx->interceptor = interceptor;
 314 }
 315
 316 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
 317
 318 /*
 319  * connect an RxRPC socket
 320  * - this just targets it at a specific destination; no actual connection
 321  *   negotiation takes place
 322  */
 323 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 324                          int addr_len, int flags)
 325 {
 326         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 327         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 328         int ret;
 329
 330         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 331
 332         ret = rxrpc_validate_address(rx, srx, addr_len);
 333         if (ret < 0) {
 334                 _leave(" = %d [bad addr]", ret);
 335                 return ret;
 336         }
 337
 338         lock_sock(&rx->sk);
 339
 340         ret = -EISCONN;
 341         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 342                 goto error;
 343
 344         switch (rx->sk.sk_state) {
 345         case RXRPC_UNBOUND:
 346                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 347         case RXRPC_CLIENT_UNBOUND:
 348         case RXRPC_CLIENT_BOUND:
 349                 break;
 350         default:
 351                 ret = -EBUSY;
 352                 goto error;
 353         }
 354
 355         rx->connect_srx = *srx;
 356         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 357         ret = 0;
 358
 359 error:
 360         release_sock(&rx->sk);
 361         return ret;
 362 }
 363
 364 /*
 365  * send a message through an RxRPC socket
 366  * - in a client this does a number of things:
 367  *   - finds/sets up a connection for the security specified (if any)
 368  *   - initiates a call (ID in control data)
 369  *   - ends the request phase of a call (if MSG_MORE is not set)
 370  *   - sends a call data packet
 371  *   - may send an abort (abort code in control data)
 372  */
 373 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 374 {
 375         struct rxrpc_local *local;
 376         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 377         int ret;
 378
 379         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 380
 381         if (m->msg_flags & MSG_OOB)
 382                 return -EOPNOTSUPP;
 383
 384         if (m->msg_name) {
 385                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 386                 if (ret < 0) {
 387                         _leave(" = %d [bad addr]", ret);
 388                         return ret;
 389                 }
 390         }
 391
 392         lock_sock(&rx->sk);
 393
 394         switch (rx->sk.sk_state) {
 395         case RXRPC_UNBOUND:
 396                 local = rxrpc_lookup_local(&rx->srx);
 397                 if (IS_ERR(local)) {
 398                         ret = PTR_ERR(local);
 399                         goto error_unlock;
 400                 }
 401
 402                 rx->local = local;
 403                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 404                 /* Fall through */
 405
 406         case RXRPC_CLIENT_UNBOUND:
 407         case RXRPC_CLIENT_BOUND:
 408                 if (!m->msg_name &&
 409                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 410                         m->msg_name = &rx->connect_srx;
 411                         m->msg_namelen = sizeof(rx->connect_srx);
 412                 }
 413         case RXRPC_SERVER_BOUND:
 414         case RXRPC_SERVER_LISTENING:
 415                 ret = rxrpc_do_sendmsg(rx, m, len);
 416                 break;
 417         default:
 418                 ret = -EINVAL;
 419                 break;
 420         }
 421
 422 error_unlock:
 423         release_sock(&rx->sk);
 424         _leave(" = %d", ret);
 425         return ret;
 426 }
 427
 428 /*
 429  * set RxRPC socket options
 430  */
 431 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 432                             char __user *optval, unsigned int optlen)
 433 {
 434         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 435         unsigned int min_sec_level;
 436         int ret;
 437
 438         _enter(",%d,%d,,%d", level, optname, optlen);
 439
 440         lock_sock(&rx->sk);
 441         ret = -EOPNOTSUPP;
 442
 443         if (level == SOL_RXRPC) {
 444                 switch (optname) {
 445                 case RXRPC_EXCLUSIVE_CONNECTION:
 446                         ret = -EINVAL;
 447                         if (optlen != 0)
 448                                 goto error;
 449                         ret = -EISCONN;
 450                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 451                                 goto error;
 452                         rx->exclusive = true;
 453                         goto success;
 454
 455                 case RXRPC_SECURITY_KEY:
 456                         ret = -EINVAL;
 457                         if (rx->key)
 458                                 goto error;
 459                         ret = -EISCONN;
 460                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 461                                 goto error;
 462                         ret = rxrpc_request_key(rx, optval, optlen);
 463                         goto error;
 464
 465                 case RXRPC_SECURITY_KEYRING:
 466                         ret = -EINVAL;
 467                         if (rx->key)
 468                                 goto error;
 469                         ret = -EISCONN;
 470                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 471                                 goto error;
 472                         ret = rxrpc_server_keyring(rx, optval, optlen);
 473                         goto error;
 474
 475                 case RXRPC_MIN_SECURITY_LEVEL:
 476                         ret = -EINVAL;
 477                         if (optlen != sizeof(unsigned int))
 478                                 goto error;
 479                         ret = -EISCONN;
 480                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 481                                 goto error;
 482                         ret = get_user(min_sec_level,
 483                                        (unsigned int __user *) optval);
 484                         if (ret < 0)
 485                                 goto error;
 486                         ret = -EINVAL;
 487                         if (min_sec_level > RXRPC_SECURITY_MAX)
 488                                 goto error;
 489                         rx->min_sec_level = min_sec_level;
 490                         goto success;
 491
 492                 default:
 493                         break;
 494                 }
 495         }
 496
 497 success:
 498         ret = 0;
 499 error:
 500         release_sock(&rx->sk);
 501         return ret;
 502 }
 503
 504 /*
 505  * permit an RxRPC socket to be polled
 506  */
 507 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 508                                poll_table *wait)
 509 {
 510         unsigned int mask;
 511         struct sock *sk = sock->sk;
 512
 513         sock_poll_wait(file, sk_sleep(sk), wait);
 514         mask = 0;
 515
 516         /* the socket is readable if there are any messages waiting on the Rx
 517          * queue */
 518         if (!skb_queue_empty(&sk->sk_receive_queue))
 519                 mask |= POLLIN | POLLRDNORM;
 520
 521         /* the socket is writable if there is space to add new data to the
 522          * socket; there is no guarantee that any particular call in progress
 523          * on the socket may have space in the Tx ACK window */
 524         if (rxrpc_writable(sk))
 525                 mask |= POLLOUT | POLLWRNORM;
 526
 527         return mask;
 528 }
 529
 530 /*
 531  * create an RxRPC socket
 532  */
 533 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 534                         int kern)
 535 {
 536         struct rxrpc_sock *rx;
 537         struct sock *sk;
 538
 539         _enter("%p,%d", sock, protocol);
 540
 541         if (!net_eq(net, &init_net))
 542                 return -EAFNOSUPPORT;
 543
 544         /* we support transport protocol UDP/UDP6 only */
 545         if (protocol != PF_INET)
 546                 return -EPROTONOSUPPORT;
 547
 548         if (sock->type != SOCK_DGRAM)
 549                 return -ESOCKTNOSUPPORT;
 550
 551         sock->ops = &rxrpc_rpc_ops;
 552         sock->state = SS_UNCONNECTED;
 553
 554         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 555         if (!sk)
 556                 return -ENOMEM;
 557
 558         sock_init_data(sock, sk);
 559         sk->sk_state            = RXRPC_UNBOUND;
 560         sk->sk_write_space      = rxrpc_write_space;
 561         sk->sk_max_ack_backlog  = 0;
 562         sk->sk_destruct         = rxrpc_sock_destructor;
 563
 564         rx = rxrpc_sk(sk);
 565         rx->family = protocol;
 566         rx->calls = RB_ROOT;
 567
 568         INIT_LIST_HEAD(&rx->listen_link);
 569         INIT_LIST_HEAD(&rx->secureq);
 570         INIT_LIST_HEAD(&rx->acceptq);
 571         rwlock_init(&rx->call_lock);
 572         memset(&rx->srx, 0, sizeof(rx->srx));
 573
 574         _leave(" = 0 [%p]", rx);
 575         return 0;
 576 }
 577
 578 /*
 579  * RxRPC socket destructor
 580  */
 581 static void rxrpc_sock_destructor(struct sock *sk)
 582 {
 583         _enter("%p", sk);
 584
 585         rxrpc_purge_queue(&sk->sk_receive_queue);
 586
 587         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 588         WARN_ON(!sk_unhashed(sk));
 589         WARN_ON(sk->sk_socket);
 590
 591         if (!sock_flag(sk, SOCK_DEAD)) {
 592                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 593                 return;
 594         }
 595 }
 596
 597 /*
 598  * release an RxRPC socket
 599  */
 600 static int rxrpc_release_sock(struct sock *sk)
 601 {
 602         struct rxrpc_sock *rx = rxrpc_sk(sk);
 603
 604         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 605
 606         /* declare the socket closed for business */
 607         sock_orphan(sk);
 608         sk->sk_shutdown = SHUTDOWN_MASK;
 609
 610         spin_lock_bh(&sk->sk_receive_queue.lock);
 611         sk->sk_state = RXRPC_CLOSE;
 612         spin_unlock_bh(&sk->sk_receive_queue.lock);
 613
 614         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 615
 616         if (!list_empty(&rx->listen_link)) {
 617                 write_lock_bh(&rx->local->services_lock);
 618                 list_del(&rx->listen_link);
 619                 write_unlock_bh(&rx->local->services_lock);
 620         }
 621
 622         /* try to flush out this socket */
 623         rxrpc_release_calls_on_socket(rx);
 624         flush_workqueue(rxrpc_workqueue);
 625         rxrpc_purge_queue(&sk->sk_receive_queue);
 626
 627         rxrpc_put_local(rx->local);
 628         rx->local = NULL;
 629         key_put(rx->key);
 630         rx->key = NULL;
 631         key_put(rx->securities);
 632         rx->securities = NULL;
 633         sock_put(sk);
 634
 635         _leave(" = 0");
 636         return 0;
 637 }
 638
 639 /*
 640  * release an RxRPC BSD socket on close() or equivalent
 641  */
 642 static int rxrpc_release(struct socket *sock)
 643 {
 644         struct sock *sk = sock->sk;
 645
 646         _enter("%p{%p}", sock, sk);
 647
 648         if (!sk)
 649                 return 0;
 650
 651         sock->sk = NULL;
 652
 653         return rxrpc_release_sock(sk);
 654 }
 655
 656 /*
 657  * RxRPC network protocol
 658  */
 659 static const struct proto_ops rxrpc_rpc_ops = {
 660         .family         = PF_RXRPC,
 661         .owner          = THIS_MODULE,
 662         .release        = rxrpc_release,
 663         .bind           = rxrpc_bind,
 664         .connect        = rxrpc_connect,
 665         .socketpair     = sock_no_socketpair,
 666         .accept         = sock_no_accept,
 667         .getname        = sock_no_getname,
 668         .poll           = rxrpc_poll,
 669         .ioctl          = sock_no_ioctl,
 670         .listen         = rxrpc_listen,
 671         .shutdown       = sock_no_shutdown,
 672         .setsockopt     = rxrpc_setsockopt,
 673         .getsockopt     = sock_no_getsockopt,
 674         .sendmsg        = rxrpc_sendmsg,
 675         .recvmsg        = rxrpc_recvmsg,
 676         .mmap           = sock_no_mmap,
 677         .sendpage       = sock_no_sendpage,
 678 };
 679
 680 static struct proto rxrpc_proto = {
 681         .name           = "RXRPC",
 682         .owner          = THIS_MODULE,
 683         .obj_size       = sizeof(struct rxrpc_sock),
 684         .max_header     = sizeof(struct rxrpc_wire_header),
 685 };
 686
 687 static const struct net_proto_family rxrpc_family_ops = {
 688         .family = PF_RXRPC,
 689         .create = rxrpc_create,
 690         .owner  = THIS_MODULE,
 691 };
 692
 693 /*
 694  * initialise and register the RxRPC protocol
 695  */
 696 static int __init af_rxrpc_init(void)
 697 {
 698         int ret = -1;
 699
 700         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 701
 702         rxrpc_epoch = get_seconds();
 703
 704         ret = -ENOMEM;
 705         rxrpc_call_jar = kmem_cache_create(
 706                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 707                 SLAB_HWCACHE_ALIGN, NULL);
 708         if (!rxrpc_call_jar) {
 709                 pr_notice("Failed to allocate call jar\n");
 710                 goto error_call_jar;
 711         }
 712
 713         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 714         if (!rxrpc_workqueue) {
 715                 pr_notice("Failed to allocate work queue\n");
 716                 goto error_work_queue;
 717         }
 718
 719         ret = rxrpc_init_security();
 720         if (ret < 0) {
 721                 pr_crit("Cannot initialise security\n");
 722                 goto error_security;
 723         }
 724
 725         ret = proto_register(&rxrpc_proto, 1);
 726         if (ret < 0) {
 727                 pr_crit("Cannot register protocol\n");
 728                 goto error_proto;
 729         }
 730
 731         ret = sock_register(&rxrpc_family_ops);
 732         if (ret < 0) {
 733                 pr_crit("Cannot register socket family\n");
 734                 goto error_sock;
 735         }
 736
 737         ret = register_key_type(&key_type_rxrpc);
 738         if (ret < 0) {
 739                 pr_crit("Cannot register client key type\n");
 740                 goto error_key_type;
 741         }
 742
 743         ret = register_key_type(&key_type_rxrpc_s);
 744         if (ret < 0) {
 745                 pr_crit("Cannot register server key type\n");
 746                 goto error_key_type_s;
 747         }
 748
 749         ret = rxrpc_sysctl_init();
 750         if (ret < 0) {
 751                 pr_crit("Cannot register sysctls\n");
 752                 goto error_sysctls;
 753         }
 754
 755 #ifdef CONFIG_PROC_FS
 756         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
 757         proc_create("rxrpc_conns", 0, init_net.proc_net,
 758                     &rxrpc_connection_seq_fops);
 759 #endif
 760         return 0;
 761
 762 error_sysctls:
 763         unregister_key_type(&key_type_rxrpc_s);
 764 error_key_type_s:
 765         unregister_key_type(&key_type_rxrpc);
 766 error_key_type:
 767         sock_unregister(PF_RXRPC);
 768 error_sock:
 769         proto_unregister(&rxrpc_proto);
 770 error_proto:
 771         rxrpc_exit_security();
 772 error_security:
 773         destroy_workqueue(rxrpc_workqueue);
 774 error_work_queue:
 775         kmem_cache_destroy(rxrpc_call_jar);
 776 error_call_jar:
 777         return ret;
 778 }
 779
 780 /*
 781  * unregister the RxRPC protocol
 782  */
 783 static void __exit af_rxrpc_exit(void)
 784 {
 785         _enter("");
 786         rxrpc_sysctl_exit();
 787         unregister_key_type(&key_type_rxrpc_s);
 788         unregister_key_type(&key_type_rxrpc);
 789         sock_unregister(PF_RXRPC);
 790         proto_unregister(&rxrpc_proto);
 791         rxrpc_destroy_all_calls();
 792         rxrpc_destroy_all_connections();
 793         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 794         rxrpc_destroy_all_locals();
 795
 796         remove_proc_entry("rxrpc_conns", init_net.proc_net);
 797         remove_proc_entry("rxrpc_calls", init_net.proc_net);
 798         destroy_workqueue(rxrpc_workqueue);
 799         rxrpc_exit_security();
 800         kmem_cache_destroy(rxrpc_call_jar);
 801         _leave("");
 802 }
 803
 804 module_init(af_rxrpc_init);
 805 module_exit(af_rxrpc_exit);