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/random.h>
  20 #include <linux/poll.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/key-type.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25 #include <net/af_rxrpc.h>
  26 #define CREATE_TRACE_POINTS
  27 #include "ar-internal.h"
  28
  29 MODULE_DESCRIPTION("RxRPC network protocol");
  30 MODULE_AUTHOR("Red Hat, Inc.");
  31 MODULE_LICENSE("GPL");
  32 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  33
  34 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  35 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
  36 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
  37
  38 static struct proto rxrpc_proto;
  39 static const struct proto_ops rxrpc_rpc_ops;
  40
  41 /* local epoch for detecting local-end reset */
  42 u32 rxrpc_epoch;
  43
  44 /* current debugging ID */
  45 atomic_t rxrpc_debug_id;
  46
  47 /* count of skbs currently in use */
  48 atomic_t rxrpc_n_skbs;
  49
  50 struct workqueue_struct *rxrpc_workqueue;
  51
  52 static void rxrpc_sock_destructor(struct sock *);
  53
  54 /*
  55  * see if an RxRPC socket is currently writable
  56  */
  57 static inline int rxrpc_writable(struct sock *sk)
  58 {
  59         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
  60 }
  61
  62 /*
  63  * wait for write bufferage to become available
  64  */
  65 static void rxrpc_write_space(struct sock *sk)
  66 {
  67         _enter("%p", sk);
  68         rcu_read_lock();
  69         if (rxrpc_writable(sk)) {
  70                 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
  71
  72                 if (skwq_has_sleeper(wq))
  73                         wake_up_interruptible(&wq->wait);
  74                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
  75         }
  76         rcu_read_unlock();
  77 }
  78
  79 /*
  80  * validate an RxRPC address
  81  */
  82 static int rxrpc_validate_address(struct rxrpc_sock *rx,
  83                                   struct sockaddr_rxrpc *srx,
  84                                   int len)
  85 {
  86         unsigned int tail;
  87
  88         if (len < sizeof(struct sockaddr_rxrpc))
  89                 return -EINVAL;
  90
  91         if (srx->srx_family != AF_RXRPC)
  92                 return -EAFNOSUPPORT;
  93
  94         if (srx->transport_type != SOCK_DGRAM)
  95                 return -ESOCKTNOSUPPORT;
  96
  97         len -= offsetof(struct sockaddr_rxrpc, transport);
  98         if (srx->transport_len < sizeof(sa_family_t) ||
  99             srx->transport_len > len)
 100                 return -EINVAL;
 101
 102         if (srx->transport.family != rx->family)
 103                 return -EAFNOSUPPORT;
 104
 105         switch (srx->transport.family) {
 106         case AF_INET:
 107                 if (srx->transport_len < sizeof(struct sockaddr_in))
 108                         return -EINVAL;
 109                 _debug("INET: %x @ %pI4",
 110                        ntohs(srx->transport.sin.sin_port),
 111                        &srx->transport.sin.sin_addr);
 112                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
 113                 break;
 114
 115         case AF_INET6:
 116         default:
 117                 return -EAFNOSUPPORT;
 118         }
 119
 120         if (tail < len)
 121                 memset((void *)srx + tail, 0, len - tail);
 122         return 0;
 123 }
 124
 125 /*
 126  * bind a local address to an RxRPC socket
 127  */
 128 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 129 {
 130         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
 131         struct sock *sk = sock->sk;
 132         struct rxrpc_local *local;
 133         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
 134         int ret;
 135
 136         _enter("%p,%p,%d", rx, saddr, len);
 137
 138         ret = rxrpc_validate_address(rx, srx, len);
 139         if (ret < 0)
 140                 goto error;
 141
 142         lock_sock(&rx->sk);
 143
 144         if (rx->sk.sk_state != RXRPC_UNBOUND) {
 145                 ret = -EINVAL;
 146                 goto error_unlock;
 147         }
 148
 149         memcpy(&rx->srx, srx, sizeof(rx->srx));
 150
 151         local = rxrpc_lookup_local(&rx->srx);
 152         if (IS_ERR(local)) {
 153                 ret = PTR_ERR(local);
 154                 goto error_unlock;
 155         }
 156
 157         if (rx->srx.srx_service) {
 158                 write_lock(&local->services_lock);
 159                 hlist_for_each_entry(prx, &local->services, listen_link) {
 160                         if (prx->srx.srx_service == rx->srx.srx_service)
 161                                 goto service_in_use;
 162                 }
 163
 164                 rx->local = local;
 165                 hlist_add_head_rcu(&rx->listen_link, &local->services);
 166                 write_unlock(&local->services_lock);
 167
 168                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
 169         } else {
 170                 rx->local = local;
 171                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 172         }
 173
 174         release_sock(&rx->sk);
 175         _leave(" = 0");
 176         return 0;
 177
 178 service_in_use:
 179         write_unlock(&local->services_lock);
 180         rxrpc_put_local(local);
 181         ret = -EADDRINUSE;
 182 error_unlock:
 183         release_sock(&rx->sk);
 184 error:
 185         _leave(" = %d", ret);
 186         return ret;
 187 }
 188
 189 /*
 190  * set the number of pending calls permitted on a listening socket
 191  */
 192 static int rxrpc_listen(struct socket *sock, int backlog)
 193 {
 194         struct sock *sk = sock->sk;
 195         struct rxrpc_sock *rx = rxrpc_sk(sk);
 196         unsigned int max, old;
 197         int ret;
 198
 199         _enter("%p,%d", rx, backlog);
 200
 201         lock_sock(&rx->sk);
 202
 203         switch (rx->sk.sk_state) {
 204         case RXRPC_UNBOUND:
 205                 ret = -EADDRNOTAVAIL;
 206                 break;
 207         case RXRPC_SERVER_BOUND:
 208                 ASSERT(rx->local != NULL);
 209                 max = READ_ONCE(rxrpc_max_backlog);
 210                 ret = -EINVAL;
 211                 if (backlog == INT_MAX)
 212                         backlog = max;
 213                 else if (backlog < 0 || backlog > max)
 214                         break;
 215                 old = sk->sk_max_ack_backlog;
 216                 sk->sk_max_ack_backlog = backlog;
 217                 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
 218                 if (ret == 0)
 219                         rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 220                 else
 221                         sk->sk_max_ack_backlog = old;
 222                 break;
 223         default:
 224                 ret = -EBUSY;
 225                 break;
 226         }
 227
 228         release_sock(&rx->sk);
 229         _leave(" = %d", ret);
 230         return ret;
 231 }
 232
 233 /**
 234  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 235  * @sock: The socket on which to make the call
 236  * @srx: The address of the peer to contact
 237  * @key: The security context to use (defaults to socket setting)
 238  * @user_call_ID: The ID to use
 239  * @gfp: The allocation constraints
 240  * @notify_rx: Where to send notifications instead of socket queue
 241  *
 242  * Allow a kernel service to begin a call on the nominated socket.  This just
 243  * sets up all the internal tracking structures and allocates connection and
 244  * call IDs as appropriate.  The call to be used is returned.
 245  *
 246  * The default socket destination address and security may be overridden by
 247  * supplying @srx and @key.
 248  */
 249 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 250                                            struct sockaddr_rxrpc *srx,
 251                                            struct key *key,
 252                                            unsigned long user_call_ID,
 253                                            gfp_t gfp,
 254                                            rxrpc_notify_rx_t notify_rx)
 255 {
 256         struct rxrpc_conn_parameters cp;
 257         struct rxrpc_call *call;
 258         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 259         int ret;
 260
 261         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 262
 263         ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
 264         if (ret < 0)
 265                 return ERR_PTR(ret);
 266
 267         lock_sock(&rx->sk);
 268
 269         if (!key)
 270                 key = rx->key;
 271         if (key && !key->payload.data[0])
 272                 key = NULL; /* a no-security key */
 273
 274         memset(&cp, 0, sizeof(cp));
 275         cp.local                = rx->local;
 276         cp.key                  = key;
 277         cp.security_level       = 0;
 278         cp.exclusive            = false;
 279         cp.service_id           = srx->srx_service;
 280         call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
 281         if (!IS_ERR(call))
 282                 call->notify_rx = notify_rx;
 283
 284         release_sock(&rx->sk);
 285         _leave(" = %p", call);
 286         return call;
 287 }
 288 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 289
 290 /**
 291  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 292  * @sock: The socket the call is on
 293  * @call: The call to end
 294  *
 295  * Allow a kernel service to end a call it was using.  The call must be
 296  * complete before this is called (the call should be aborted if necessary).
 297  */
 298 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
 299 {
 300         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 301         rxrpc_release_call(rxrpc_sk(sock->sk), call);
 302         rxrpc_put_call(call, rxrpc_call_put);
 303 }
 304 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 305
 306 /**
 307  * rxrpc_kernel_new_call_notification - Get notifications of new calls
 308  * @sock: The socket to intercept received messages on
 309  * @notify_new_call: Function to be called when new calls appear
 310  * @discard_new_call: Function to discard preallocated calls
 311  *
 312  * Allow a kernel service to be given notifications about new calls.
 313  */
 314 void rxrpc_kernel_new_call_notification(
 315         struct socket *sock,
 316         rxrpc_notify_new_call_t notify_new_call,
 317         rxrpc_discard_new_call_t discard_new_call)
 318 {
 319         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 320
 321         rx->notify_new_call = notify_new_call;
 322         rx->discard_new_call = discard_new_call;
 323 }
 324 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 325
 326 /*
 327  * connect an RxRPC socket
 328  * - this just targets it at a specific destination; no actual connection
 329  *   negotiation takes place
 330  */
 331 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 332                          int addr_len, int flags)
 333 {
 334         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 335         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 336         int ret;
 337
 338         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 339
 340         ret = rxrpc_validate_address(rx, srx, addr_len);
 341         if (ret < 0) {
 342                 _leave(" = %d [bad addr]", ret);
 343                 return ret;
 344         }
 345
 346         lock_sock(&rx->sk);
 347
 348         ret = -EISCONN;
 349         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 350                 goto error;
 351
 352         switch (rx->sk.sk_state) {
 353         case RXRPC_UNBOUND:
 354                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 355         case RXRPC_CLIENT_UNBOUND:
 356         case RXRPC_CLIENT_BOUND:
 357                 break;
 358         default:
 359                 ret = -EBUSY;
 360                 goto error;
 361         }
 362
 363         rx->connect_srx = *srx;
 364         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 365         ret = 0;
 366
 367 error:
 368         release_sock(&rx->sk);
 369         return ret;
 370 }
 371
 372 /*
 373  * send a message through an RxRPC socket
 374  * - in a client this does a number of things:
 375  *   - finds/sets up a connection for the security specified (if any)
 376  *   - initiates a call (ID in control data)
 377  *   - ends the request phase of a call (if MSG_MORE is not set)
 378  *   - sends a call data packet
 379  *   - may send an abort (abort code in control data)
 380  */
 381 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 382 {
 383         struct rxrpc_local *local;
 384         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 385         int ret;
 386
 387         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 388
 389         if (m->msg_flags & MSG_OOB)
 390                 return -EOPNOTSUPP;
 391
 392         if (m->msg_name) {
 393                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 394                 if (ret < 0) {
 395                         _leave(" = %d [bad addr]", ret);
 396                         return ret;
 397                 }
 398         }
 399
 400         lock_sock(&rx->sk);
 401
 402         switch (rx->sk.sk_state) {
 403         case RXRPC_UNBOUND:
 404                 local = rxrpc_lookup_local(&rx->srx);
 405                 if (IS_ERR(local)) {
 406                         ret = PTR_ERR(local);
 407                         goto error_unlock;
 408                 }
 409
 410                 rx->local = local;
 411                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 412                 /* Fall through */
 413
 414         case RXRPC_CLIENT_UNBOUND:
 415         case RXRPC_CLIENT_BOUND:
 416                 if (!m->msg_name &&
 417                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 418                         m->msg_name = &rx->connect_srx;
 419                         m->msg_namelen = sizeof(rx->connect_srx);
 420                 }
 421         case RXRPC_SERVER_BOUND:
 422         case RXRPC_SERVER_LISTENING:
 423                 ret = rxrpc_do_sendmsg(rx, m, len);
 424                 break;
 425         default:
 426                 ret = -EINVAL;
 427                 break;
 428         }
 429
 430 error_unlock:
 431         release_sock(&rx->sk);
 432         _leave(" = %d", ret);
 433         return ret;
 434 }
 435
 436 /*
 437  * set RxRPC socket options
 438  */
 439 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 440                             char __user *optval, unsigned int optlen)
 441 {
 442         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 443         unsigned int min_sec_level;
 444         int ret;
 445
 446         _enter(",%d,%d,,%d", level, optname, optlen);
 447
 448         lock_sock(&rx->sk);
 449         ret = -EOPNOTSUPP;
 450
 451         if (level == SOL_RXRPC) {
 452                 switch (optname) {
 453                 case RXRPC_EXCLUSIVE_CONNECTION:
 454                         ret = -EINVAL;
 455                         if (optlen != 0)
 456                                 goto error;
 457                         ret = -EISCONN;
 458                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 459                                 goto error;
 460                         rx->exclusive = true;
 461                         goto success;
 462
 463                 case RXRPC_SECURITY_KEY:
 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_request_key(rx, optval, optlen);
 471                         goto error;
 472
 473                 case RXRPC_SECURITY_KEYRING:
 474                         ret = -EINVAL;
 475                         if (rx->key)
 476                                 goto error;
 477                         ret = -EISCONN;
 478                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 479                                 goto error;
 480                         ret = rxrpc_server_keyring(rx, optval, optlen);
 481                         goto error;
 482
 483                 case RXRPC_MIN_SECURITY_LEVEL:
 484                         ret = -EINVAL;
 485                         if (optlen != sizeof(unsigned int))
 486                                 goto error;
 487                         ret = -EISCONN;
 488                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 489                                 goto error;
 490                         ret = get_user(min_sec_level,
 491                                        (unsigned int __user *) optval);
 492                         if (ret < 0)
 493                                 goto error;
 494                         ret = -EINVAL;
 495                         if (min_sec_level > RXRPC_SECURITY_MAX)
 496                                 goto error;
 497                         rx->min_sec_level = min_sec_level;
 498                         goto success;
 499
 500                 default:
 501                         break;
 502                 }
 503         }
 504
 505 success:
 506         ret = 0;
 507 error:
 508         release_sock(&rx->sk);
 509         return ret;
 510 }
 511
 512 /*
 513  * permit an RxRPC socket to be polled
 514  */
 515 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 516                                poll_table *wait)
 517 {
 518         struct sock *sk = sock->sk;
 519         struct rxrpc_sock *rx = rxrpc_sk(sk);
 520         unsigned int mask;
 521
 522         sock_poll_wait(file, sk_sleep(sk), wait);
 523         mask = 0;
 524
 525         /* the socket is readable if there are any messages waiting on the Rx
 526          * queue */
 527         if (!list_empty(&rx->recvmsg_q))
 528                 mask |= POLLIN | POLLRDNORM;
 529
 530         /* the socket is writable if there is space to add new data to the
 531          * socket; there is no guarantee that any particular call in progress
 532          * on the socket may have space in the Tx ACK window */
 533         if (rxrpc_writable(sk))
 534                 mask |= POLLOUT | POLLWRNORM;
 535
 536         return mask;
 537 }
 538
 539 /*
 540  * create an RxRPC socket
 541  */
 542 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 543                         int kern)
 544 {
 545         struct rxrpc_sock *rx;
 546         struct sock *sk;
 547
 548         _enter("%p,%d", sock, protocol);
 549
 550         if (!net_eq(net, &init_net))
 551                 return -EAFNOSUPPORT;
 552
 553         /* we support transport protocol UDP/UDP6 only */
 554         if (protocol != PF_INET)
 555                 return -EPROTONOSUPPORT;
 556
 557         if (sock->type != SOCK_DGRAM)
 558                 return -ESOCKTNOSUPPORT;
 559
 560         sock->ops = &rxrpc_rpc_ops;
 561         sock->state = SS_UNCONNECTED;
 562
 563         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 564         if (!sk)
 565                 return -ENOMEM;
 566
 567         sock_init_data(sock, sk);
 568         sock_set_flag(sk, SOCK_RCU_FREE);
 569         sk->sk_state            = RXRPC_UNBOUND;
 570         sk->sk_write_space      = rxrpc_write_space;
 571         sk->sk_max_ack_backlog  = 0;
 572         sk->sk_destruct         = rxrpc_sock_destructor;
 573
 574         rx = rxrpc_sk(sk);
 575         rx->family = protocol;
 576         rx->calls = RB_ROOT;
 577
 578         INIT_HLIST_NODE(&rx->listen_link);
 579         spin_lock_init(&rx->incoming_lock);
 580         INIT_LIST_HEAD(&rx->sock_calls);
 581         INIT_LIST_HEAD(&rx->to_be_accepted);
 582         INIT_LIST_HEAD(&rx->recvmsg_q);
 583         rwlock_init(&rx->recvmsg_lock);
 584         rwlock_init(&rx->call_lock);
 585         memset(&rx->srx, 0, sizeof(rx->srx));
 586
 587         _leave(" = 0 [%p]", rx);
 588         return 0;
 589 }
 590
 591 /*
 592  * Kill all the calls on a socket and shut it down.
 593  */
 594 static int rxrpc_shutdown(struct socket *sock, int flags)
 595 {
 596         struct sock *sk = sock->sk;
 597         struct rxrpc_sock *rx = rxrpc_sk(sk);
 598         int ret = 0;
 599
 600         _enter("%p,%d", sk, flags);
 601
 602         if (flags != SHUT_RDWR)
 603                 return -EOPNOTSUPP;
 604         if (sk->sk_state == RXRPC_CLOSE)
 605                 return -ESHUTDOWN;
 606
 607         lock_sock(sk);
 608
 609         spin_lock_bh(&sk->sk_receive_queue.lock);
 610         if (sk->sk_state < RXRPC_CLOSE) {
 611                 sk->sk_state = RXRPC_CLOSE;
 612                 sk->sk_shutdown = SHUTDOWN_MASK;
 613         } else {
 614                 ret = -ESHUTDOWN;
 615         }
 616         spin_unlock_bh(&sk->sk_receive_queue.lock);
 617
 618         rxrpc_discard_prealloc(rx);
 619
 620         release_sock(sk);
 621         return ret;
 622 }
 623
 624 /*
 625  * RxRPC socket destructor
 626  */
 627 static void rxrpc_sock_destructor(struct sock *sk)
 628 {
 629         _enter("%p", sk);
 630
 631         rxrpc_purge_queue(&sk->sk_receive_queue);
 632
 633         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 634         WARN_ON(!sk_unhashed(sk));
 635         WARN_ON(sk->sk_socket);
 636
 637         if (!sock_flag(sk, SOCK_DEAD)) {
 638                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 639                 return;
 640         }
 641 }
 642
 643 /*
 644  * release an RxRPC socket
 645  */
 646 static int rxrpc_release_sock(struct sock *sk)
 647 {
 648         struct rxrpc_sock *rx = rxrpc_sk(sk);
 649
 650         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 651
 652         /* declare the socket closed for business */
 653         sock_orphan(sk);
 654         sk->sk_shutdown = SHUTDOWN_MASK;
 655
 656         spin_lock_bh(&sk->sk_receive_queue.lock);
 657         sk->sk_state = RXRPC_CLOSE;
 658         spin_unlock_bh(&sk->sk_receive_queue.lock);
 659
 660         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 661
 662         if (!hlist_unhashed(&rx->listen_link)) {
 663                 write_lock(&rx->local->services_lock);
 664                 hlist_del_rcu(&rx->listen_link);
 665                 write_unlock(&rx->local->services_lock);
 666         }
 667
 668         /* try to flush out this socket */
 669         rxrpc_discard_prealloc(rx);
 670         rxrpc_release_calls_on_socket(rx);
 671         flush_workqueue(rxrpc_workqueue);
 672         rxrpc_purge_queue(&sk->sk_receive_queue);
 673
 674         rxrpc_put_local(rx->local);
 675         rx->local = NULL;
 676         key_put(rx->key);
 677         rx->key = NULL;
 678         key_put(rx->securities);
 679         rx->securities = NULL;
 680         sock_put(sk);
 681
 682         _leave(" = 0");
 683         return 0;
 684 }
 685
 686 /*
 687  * release an RxRPC BSD socket on close() or equivalent
 688  */
 689 static int rxrpc_release(struct socket *sock)
 690 {
 691         struct sock *sk = sock->sk;
 692
 693         _enter("%p{%p}", sock, sk);
 694
 695         if (!sk)
 696                 return 0;
 697
 698         sock->sk = NULL;
 699
 700         return rxrpc_release_sock(sk);
 701 }
 702
 703 /*
 704  * RxRPC network protocol
 705  */
 706 static const struct proto_ops rxrpc_rpc_ops = {
 707         .family         = PF_RXRPC,
 708         .owner          = THIS_MODULE,
 709         .release        = rxrpc_release,
 710         .bind           = rxrpc_bind,
 711         .connect        = rxrpc_connect,
 712         .socketpair     = sock_no_socketpair,
 713         .accept         = sock_no_accept,
 714         .getname        = sock_no_getname,
 715         .poll           = rxrpc_poll,
 716         .ioctl          = sock_no_ioctl,
 717         .listen         = rxrpc_listen,
 718         .shutdown       = rxrpc_shutdown,
 719         .setsockopt     = rxrpc_setsockopt,
 720         .getsockopt     = sock_no_getsockopt,
 721         .sendmsg        = rxrpc_sendmsg,
 722         .recvmsg        = rxrpc_recvmsg,
 723         .mmap           = sock_no_mmap,
 724         .sendpage       = sock_no_sendpage,
 725 };
 726
 727 static struct proto rxrpc_proto = {
 728         .name           = "RXRPC",
 729         .owner          = THIS_MODULE,
 730         .obj_size       = sizeof(struct rxrpc_sock),
 731         .max_header     = sizeof(struct rxrpc_wire_header),
 732 };
 733
 734 static const struct net_proto_family rxrpc_family_ops = {
 735         .family = PF_RXRPC,
 736         .create = rxrpc_create,
 737         .owner  = THIS_MODULE,
 738 };
 739
 740 /*
 741  * initialise and register the RxRPC protocol
 742  */
 743 static int __init af_rxrpc_init(void)
 744 {
 745         int ret = -1;
 746
 747         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 748
 749         get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch));
 750         rxrpc_epoch |= RXRPC_RANDOM_EPOCH;
 751         get_random_bytes(&rxrpc_client_conn_ids.cur,
 752                          sizeof(rxrpc_client_conn_ids.cur));
 753         rxrpc_client_conn_ids.cur &= 0x3fffffff;
 754         if (rxrpc_client_conn_ids.cur == 0)
 755                 rxrpc_client_conn_ids.cur = 1;
 756
 757         ret = -ENOMEM;
 758         rxrpc_call_jar = kmem_cache_create(
 759                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 760                 SLAB_HWCACHE_ALIGN, NULL);
 761         if (!rxrpc_call_jar) {
 762                 pr_notice("Failed to allocate call jar\n");
 763                 goto error_call_jar;
 764         }
 765
 766         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 767         if (!rxrpc_workqueue) {
 768                 pr_notice("Failed to allocate work queue\n");
 769                 goto error_work_queue;
 770         }
 771
 772         ret = rxrpc_init_security();
 773         if (ret < 0) {
 774                 pr_crit("Cannot initialise security\n");
 775                 goto error_security;
 776         }
 777
 778         ret = proto_register(&rxrpc_proto, 1);
 779         if (ret < 0) {
 780                 pr_crit("Cannot register protocol\n");
 781                 goto error_proto;
 782         }
 783
 784         ret = sock_register(&rxrpc_family_ops);
 785         if (ret < 0) {
 786                 pr_crit("Cannot register socket family\n");
 787                 goto error_sock;
 788         }
 789
 790         ret = register_key_type(&key_type_rxrpc);
 791         if (ret < 0) {
 792                 pr_crit("Cannot register client key type\n");
 793                 goto error_key_type;
 794         }
 795
 796         ret = register_key_type(&key_type_rxrpc_s);
 797         if (ret < 0) {
 798                 pr_crit("Cannot register server key type\n");
 799                 goto error_key_type_s;
 800         }
 801
 802         ret = rxrpc_sysctl_init();
 803         if (ret < 0) {
 804                 pr_crit("Cannot register sysctls\n");
 805                 goto error_sysctls;
 806         }
 807
 808 #ifdef CONFIG_PROC_FS
 809         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
 810         proc_create("rxrpc_conns", 0, init_net.proc_net,
 811                     &rxrpc_connection_seq_fops);
 812 #endif
 813         return 0;
 814
 815 error_sysctls:
 816         unregister_key_type(&key_type_rxrpc_s);
 817 error_key_type_s:
 818         unregister_key_type(&key_type_rxrpc);
 819 error_key_type:
 820         sock_unregister(PF_RXRPC);
 821 error_sock:
 822         proto_unregister(&rxrpc_proto);
 823 error_proto:
 824         rxrpc_exit_security();
 825 error_security:
 826         destroy_workqueue(rxrpc_workqueue);
 827 error_work_queue:
 828         kmem_cache_destroy(rxrpc_call_jar);
 829 error_call_jar:
 830         return ret;
 831 }
 832
 833 /*
 834  * unregister the RxRPC protocol
 835  */
 836 static void __exit af_rxrpc_exit(void)
 837 {
 838         _enter("");
 839         rxrpc_sysctl_exit();
 840         unregister_key_type(&key_type_rxrpc_s);
 841         unregister_key_type(&key_type_rxrpc);
 842         sock_unregister(PF_RXRPC);
 843         proto_unregister(&rxrpc_proto);
 844         rxrpc_destroy_all_calls();
 845         rxrpc_destroy_all_connections();
 846         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 847         rxrpc_destroy_all_locals();
 848
 849         remove_proc_entry("rxrpc_conns", init_net.proc_net);
 850         remove_proc_entry("rxrpc_calls", init_net.proc_net);
 851         destroy_workqueue(rxrpc_workqueue);
 852         rxrpc_exit_security();
 853         kmem_cache_destroy(rxrpc_call_jar);
 854         _leave("");
 855 }
 856
 857 module_init(af_rxrpc_init);
 858 module_exit(af_rxrpc_exit);