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_tx_skbs, rxrpc_n_rx_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                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
 110                 break;
 111
 112 #ifdef CONFIG_AF_RXRPC_IPV6
 113         case AF_INET6:
 114                 if (srx->transport_len < sizeof(struct sockaddr_in6))
 115                         return -EINVAL;
 116                 tail = offsetof(struct sockaddr_rxrpc, transport) +
 117                         sizeof(struct sockaddr_in6);
 118                 break;
 119 #endif
 120
 121         default:
 122                 return -EAFNOSUPPORT;
 123         }
 124
 125         if (tail < len)
 126                 memset((void *)srx + tail, 0, len - tail);
 127         _debug("INET: %pISp", &srx->transport);
 128         return 0;
 129 }
 130
 131 /*
 132  * bind a local address to an RxRPC socket
 133  */
 134 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 135 {
 136         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
 137         struct sock *sk = sock->sk;
 138         struct rxrpc_local *local;
 139         struct rxrpc_sock *rx = rxrpc_sk(sk);
 140         u16 service_id = srx->srx_service;
 141         int ret;
 142
 143         _enter("%p,%p,%d", rx, saddr, len);
 144
 145         ret = rxrpc_validate_address(rx, srx, len);
 146         if (ret < 0)
 147                 goto error;
 148
 149         lock_sock(&rx->sk);
 150
 151         if (rx->sk.sk_state != RXRPC_UNBOUND) {
 152                 ret = -EINVAL;
 153                 goto error_unlock;
 154         }
 155
 156         memcpy(&rx->srx, srx, sizeof(rx->srx));
 157
 158         local = rxrpc_lookup_local(&rx->srx);
 159         if (IS_ERR(local)) {
 160                 ret = PTR_ERR(local);
 161                 goto error_unlock;
 162         }
 163
 164         if (service_id) {
 165                 write_lock(&local->services_lock);
 166                 if (rcu_access_pointer(local->service))
 167                         goto service_in_use;
 168                 rx->local = local;
 169                 rcu_assign_pointer(local->service, rx);
 170                 write_unlock(&local->services_lock);
 171
 172                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
 173         } else {
 174                 rx->local = local;
 175                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 176         }
 177
 178         release_sock(&rx->sk);
 179         _leave(" = 0");
 180         return 0;
 181
 182 service_in_use:
 183         write_unlock(&local->services_lock);
 184         rxrpc_put_local(local);
 185         ret = -EADDRINUSE;
 186 error_unlock:
 187         release_sock(&rx->sk);
 188 error:
 189         _leave(" = %d", ret);
 190         return ret;
 191 }
 192
 193 /*
 194  * set the number of pending calls permitted on a listening socket
 195  */
 196 static int rxrpc_listen(struct socket *sock, int backlog)
 197 {
 198         struct sock *sk = sock->sk;
 199         struct rxrpc_sock *rx = rxrpc_sk(sk);
 200         unsigned int max, old;
 201         int ret;
 202
 203         _enter("%p,%d", rx, backlog);
 204
 205         lock_sock(&rx->sk);
 206
 207         switch (rx->sk.sk_state) {
 208         case RXRPC_UNBOUND:
 209                 ret = -EADDRNOTAVAIL;
 210                 break;
 211         case RXRPC_SERVER_BOUND:
 212                 ASSERT(rx->local != NULL);
 213                 max = READ_ONCE(rxrpc_max_backlog);
 214                 ret = -EINVAL;
 215                 if (backlog == INT_MAX)
 216                         backlog = max;
 217                 else if (backlog < 0 || backlog > max)
 218                         break;
 219                 old = sk->sk_max_ack_backlog;
 220                 sk->sk_max_ack_backlog = backlog;
 221                 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
 222                 if (ret == 0)
 223                         rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 224                 else
 225                         sk->sk_max_ack_backlog = old;
 226                 break;
 227         case RXRPC_SERVER_LISTENING:
 228                 if (backlog == 0) {
 229                         rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
 230                         sk->sk_max_ack_backlog = 0;
 231                         rxrpc_discard_prealloc(rx);
 232                         ret = 0;
 233                         break;
 234                 }
 235         default:
 236                 ret = -EBUSY;
 237                 break;
 238         }
 239
 240         release_sock(&rx->sk);
 241         _leave(" = %d", ret);
 242         return ret;
 243 }
 244
 245 /**
 246  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 247  * @sock: The socket on which to make the call
 248  * @srx: The address of the peer to contact
 249  * @key: The security context to use (defaults to socket setting)
 250  * @user_call_ID: The ID to use
 251  * @gfp: The allocation constraints
 252  * @notify_rx: Where to send notifications instead of socket queue
 253  *
 254  * Allow a kernel service to begin a call on the nominated socket.  This just
 255  * sets up all the internal tracking structures and allocates connection and
 256  * call IDs as appropriate.  The call to be used is returned.
 257  *
 258  * The default socket destination address and security may be overridden by
 259  * supplying @srx and @key.
 260  */
 261 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 262                                            struct sockaddr_rxrpc *srx,
 263                                            struct key *key,
 264                                            unsigned long user_call_ID,
 265                                            gfp_t gfp,
 266                                            rxrpc_notify_rx_t notify_rx)
 267 {
 268         struct rxrpc_conn_parameters cp;
 269         struct rxrpc_call *call;
 270         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 271         int ret;
 272
 273         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 274
 275         ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
 276         if (ret < 0)
 277                 return ERR_PTR(ret);
 278
 279         lock_sock(&rx->sk);
 280
 281         if (!key)
 282                 key = rx->key;
 283         if (key && !key->payload.data[0])
 284                 key = NULL; /* a no-security key */
 285
 286         memset(&cp, 0, sizeof(cp));
 287         cp.local                = rx->local;
 288         cp.key                  = key;
 289         cp.security_level       = 0;
 290         cp.exclusive            = false;
 291         cp.service_id           = srx->srx_service;
 292         call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
 293         if (!IS_ERR(call))
 294                 call->notify_rx = notify_rx;
 295
 296         release_sock(&rx->sk);
 297         _leave(" = %p", call);
 298         return call;
 299 }
 300 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 301
 302 /**
 303  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 304  * @sock: The socket the call is on
 305  * @call: The call to end
 306  *
 307  * Allow a kernel service to end a call it was using.  The call must be
 308  * complete before this is called (the call should be aborted if necessary).
 309  */
 310 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
 311 {
 312         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 313         rxrpc_release_call(rxrpc_sk(sock->sk), call);
 314         rxrpc_put_call(call, rxrpc_call_put_kernel);
 315 }
 316 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 317
 318 /**
 319  * rxrpc_kernel_new_call_notification - Get notifications of new calls
 320  * @sock: The socket to intercept received messages on
 321  * @notify_new_call: Function to be called when new calls appear
 322  * @discard_new_call: Function to discard preallocated calls
 323  *
 324  * Allow a kernel service to be given notifications about new calls.
 325  */
 326 void rxrpc_kernel_new_call_notification(
 327         struct socket *sock,
 328         rxrpc_notify_new_call_t notify_new_call,
 329         rxrpc_discard_new_call_t discard_new_call)
 330 {
 331         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 332
 333         rx->notify_new_call = notify_new_call;
 334         rx->discard_new_call = discard_new_call;
 335 }
 336 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 337
 338 /*
 339  * connect an RxRPC socket
 340  * - this just targets it at a specific destination; no actual connection
 341  *   negotiation takes place
 342  */
 343 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 344                          int addr_len, int flags)
 345 {
 346         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 347         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 348         int ret;
 349
 350         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 351
 352         ret = rxrpc_validate_address(rx, srx, addr_len);
 353         if (ret < 0) {
 354                 _leave(" = %d [bad addr]", ret);
 355                 return ret;
 356         }
 357
 358         lock_sock(&rx->sk);
 359
 360         ret = -EISCONN;
 361         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 362                 goto error;
 363
 364         switch (rx->sk.sk_state) {
 365         case RXRPC_UNBOUND:
 366                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 367         case RXRPC_CLIENT_UNBOUND:
 368         case RXRPC_CLIENT_BOUND:
 369                 break;
 370         default:
 371                 ret = -EBUSY;
 372                 goto error;
 373         }
 374
 375         rx->connect_srx = *srx;
 376         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 377         ret = 0;
 378
 379 error:
 380         release_sock(&rx->sk);
 381         return ret;
 382 }
 383
 384 /*
 385  * send a message through an RxRPC socket
 386  * - in a client this does a number of things:
 387  *   - finds/sets up a connection for the security specified (if any)
 388  *   - initiates a call (ID in control data)
 389  *   - ends the request phase of a call (if MSG_MORE is not set)
 390  *   - sends a call data packet
 391  *   - may send an abort (abort code in control data)
 392  */
 393 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 394 {
 395         struct rxrpc_local *local;
 396         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 397         int ret;
 398
 399         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 400
 401         if (m->msg_flags & MSG_OOB)
 402                 return -EOPNOTSUPP;
 403
 404         if (m->msg_name) {
 405                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 406                 if (ret < 0) {
 407                         _leave(" = %d [bad addr]", ret);
 408                         return ret;
 409                 }
 410         }
 411
 412         lock_sock(&rx->sk);
 413
 414         switch (rx->sk.sk_state) {
 415         case RXRPC_UNBOUND:
 416                 rx->srx.srx_family = AF_RXRPC;
 417                 rx->srx.srx_service = 0;
 418                 rx->srx.transport_type = SOCK_DGRAM;
 419                 rx->srx.transport.family = rx->family;
 420                 switch (rx->family) {
 421                 case AF_INET:
 422                         rx->srx.transport_len = sizeof(struct sockaddr_in);
 423                         break;
 424 #ifdef CONFIG_AF_RXRPC_IPV6
 425                 case AF_INET6:
 426                         rx->srx.transport_len = sizeof(struct sockaddr_in6);
 427                         break;
 428 #endif
 429                 default:
 430                         ret = -EAFNOSUPPORT;
 431                         goto error_unlock;
 432                 }
 433                 local = rxrpc_lookup_local(&rx->srx);
 434                 if (IS_ERR(local)) {
 435                         ret = PTR_ERR(local);
 436                         goto error_unlock;
 437                 }
 438
 439                 rx->local = local;
 440                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 441                 /* Fall through */
 442
 443         case RXRPC_CLIENT_UNBOUND:
 444         case RXRPC_CLIENT_BOUND:
 445                 if (!m->msg_name &&
 446                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 447                         m->msg_name = &rx->connect_srx;
 448                         m->msg_namelen = sizeof(rx->connect_srx);
 449                 }
 450         case RXRPC_SERVER_BOUND:
 451         case RXRPC_SERVER_LISTENING:
 452                 ret = rxrpc_do_sendmsg(rx, m, len);
 453                 break;
 454         default:
 455                 ret = -EINVAL;
 456                 break;
 457         }
 458
 459 error_unlock:
 460         release_sock(&rx->sk);
 461         _leave(" = %d", ret);
 462         return ret;
 463 }
 464
 465 /*
 466  * set RxRPC socket options
 467  */
 468 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 469                             char __user *optval, unsigned int optlen)
 470 {
 471         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 472         unsigned int min_sec_level;
 473         int ret;
 474
 475         _enter(",%d,%d,,%d", level, optname, optlen);
 476
 477         lock_sock(&rx->sk);
 478         ret = -EOPNOTSUPP;
 479
 480         if (level == SOL_RXRPC) {
 481                 switch (optname) {
 482                 case RXRPC_EXCLUSIVE_CONNECTION:
 483                         ret = -EINVAL;
 484                         if (optlen != 0)
 485                                 goto error;
 486                         ret = -EISCONN;
 487                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 488                                 goto error;
 489                         rx->exclusive = true;
 490                         goto success;
 491
 492                 case RXRPC_SECURITY_KEY:
 493                         ret = -EINVAL;
 494                         if (rx->key)
 495                                 goto error;
 496                         ret = -EISCONN;
 497                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 498                                 goto error;
 499                         ret = rxrpc_request_key(rx, optval, optlen);
 500                         goto error;
 501
 502                 case RXRPC_SECURITY_KEYRING:
 503                         ret = -EINVAL;
 504                         if (rx->key)
 505                                 goto error;
 506                         ret = -EISCONN;
 507                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 508                                 goto error;
 509                         ret = rxrpc_server_keyring(rx, optval, optlen);
 510                         goto error;
 511
 512                 case RXRPC_MIN_SECURITY_LEVEL:
 513                         ret = -EINVAL;
 514                         if (optlen != sizeof(unsigned int))
 515                                 goto error;
 516                         ret = -EISCONN;
 517                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 518                                 goto error;
 519                         ret = get_user(min_sec_level,
 520                                        (unsigned int __user *) optval);
 521                         if (ret < 0)
 522                                 goto error;
 523                         ret = -EINVAL;
 524                         if (min_sec_level > RXRPC_SECURITY_MAX)
 525                                 goto error;
 526                         rx->min_sec_level = min_sec_level;
 527                         goto success;
 528
 529                 default:
 530                         break;
 531                 }
 532         }
 533
 534 success:
 535         ret = 0;
 536 error:
 537         release_sock(&rx->sk);
 538         return ret;
 539 }
 540
 541 /*
 542  * permit an RxRPC socket to be polled
 543  */
 544 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 545                                poll_table *wait)
 546 {
 547         struct sock *sk = sock->sk;
 548         struct rxrpc_sock *rx = rxrpc_sk(sk);
 549         unsigned int mask;
 550
 551         sock_poll_wait(file, sk_sleep(sk), wait);
 552         mask = 0;
 553
 554         /* the socket is readable if there are any messages waiting on the Rx
 555          * queue */
 556         if (!list_empty(&rx->recvmsg_q))
 557                 mask |= POLLIN | POLLRDNORM;
 558
 559         /* the socket is writable if there is space to add new data to the
 560          * socket; there is no guarantee that any particular call in progress
 561          * on the socket may have space in the Tx ACK window */
 562         if (rxrpc_writable(sk))
 563                 mask |= POLLOUT | POLLWRNORM;
 564
 565         return mask;
 566 }
 567
 568 /*
 569  * create an RxRPC socket
 570  */
 571 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 572                         int kern)
 573 {
 574         struct rxrpc_sock *rx;
 575         struct sock *sk;
 576
 577         _enter("%p,%d", sock, protocol);
 578
 579         if (!net_eq(net, &init_net))
 580                 return -EAFNOSUPPORT;
 581
 582         /* we support transport protocol UDP/UDP6 only */
 583         if (protocol != PF_INET &&
 584             IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
 585                 return -EPROTONOSUPPORT;
 586
 587         if (sock->type != SOCK_DGRAM)
 588                 return -ESOCKTNOSUPPORT;
 589
 590         sock->ops = &rxrpc_rpc_ops;
 591         sock->state = SS_UNCONNECTED;
 592
 593         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 594         if (!sk)
 595                 return -ENOMEM;
 596
 597         sock_init_data(sock, sk);
 598         sock_set_flag(sk, SOCK_RCU_FREE);
 599         sk->sk_state            = RXRPC_UNBOUND;
 600         sk->sk_write_space      = rxrpc_write_space;
 601         sk->sk_max_ack_backlog  = 0;
 602         sk->sk_destruct         = rxrpc_sock_destructor;
 603
 604         rx = rxrpc_sk(sk);
 605         rx->family = protocol;
 606         rx->calls = RB_ROOT;
 607
 608         spin_lock_init(&rx->incoming_lock);
 609         INIT_LIST_HEAD(&rx->sock_calls);
 610         INIT_LIST_HEAD(&rx->to_be_accepted);
 611         INIT_LIST_HEAD(&rx->recvmsg_q);
 612         rwlock_init(&rx->recvmsg_lock);
 613         rwlock_init(&rx->call_lock);
 614         memset(&rx->srx, 0, sizeof(rx->srx));
 615
 616         _leave(" = 0 [%p]", rx);
 617         return 0;
 618 }
 619
 620 /*
 621  * Kill all the calls on a socket and shut it down.
 622  */
 623 static int rxrpc_shutdown(struct socket *sock, int flags)
 624 {
 625         struct sock *sk = sock->sk;
 626         struct rxrpc_sock *rx = rxrpc_sk(sk);
 627         int ret = 0;
 628
 629         _enter("%p,%d", sk, flags);
 630
 631         if (flags != SHUT_RDWR)
 632                 return -EOPNOTSUPP;
 633         if (sk->sk_state == RXRPC_CLOSE)
 634                 return -ESHUTDOWN;
 635
 636         lock_sock(sk);
 637
 638         spin_lock_bh(&sk->sk_receive_queue.lock);
 639         if (sk->sk_state < RXRPC_CLOSE) {
 640                 sk->sk_state = RXRPC_CLOSE;
 641                 sk->sk_shutdown = SHUTDOWN_MASK;
 642         } else {
 643                 ret = -ESHUTDOWN;
 644         }
 645         spin_unlock_bh(&sk->sk_receive_queue.lock);
 646
 647         rxrpc_discard_prealloc(rx);
 648
 649         release_sock(sk);
 650         return ret;
 651 }
 652
 653 /*
 654  * RxRPC socket destructor
 655  */
 656 static void rxrpc_sock_destructor(struct sock *sk)
 657 {
 658         _enter("%p", sk);
 659
 660         rxrpc_purge_queue(&sk->sk_receive_queue);
 661
 662         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 663         WARN_ON(!sk_unhashed(sk));
 664         WARN_ON(sk->sk_socket);
 665
 666         if (!sock_flag(sk, SOCK_DEAD)) {
 667                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 668                 return;
 669         }
 670 }
 671
 672 /*
 673  * release an RxRPC socket
 674  */
 675 static int rxrpc_release_sock(struct sock *sk)
 676 {
 677         struct rxrpc_sock *rx = rxrpc_sk(sk);
 678
 679         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 680
 681         /* declare the socket closed for business */
 682         sock_orphan(sk);
 683         sk->sk_shutdown = SHUTDOWN_MASK;
 684
 685         spin_lock_bh(&sk->sk_receive_queue.lock);
 686         sk->sk_state = RXRPC_CLOSE;
 687         spin_unlock_bh(&sk->sk_receive_queue.lock);
 688
 689         if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
 690                 write_lock(&rx->local->services_lock);
 691                 rcu_assign_pointer(rx->local->service, NULL);
 692                 write_unlock(&rx->local->services_lock);
 693         }
 694
 695         /* try to flush out this socket */
 696         rxrpc_discard_prealloc(rx);
 697         rxrpc_release_calls_on_socket(rx);
 698         flush_workqueue(rxrpc_workqueue);
 699         rxrpc_purge_queue(&sk->sk_receive_queue);
 700
 701         rxrpc_put_local(rx->local);
 702         rx->local = NULL;
 703         key_put(rx->key);
 704         rx->key = NULL;
 705         key_put(rx->securities);
 706         rx->securities = NULL;
 707         sock_put(sk);
 708
 709         _leave(" = 0");
 710         return 0;
 711 }
 712
 713 /*
 714  * release an RxRPC BSD socket on close() or equivalent
 715  */
 716 static int rxrpc_release(struct socket *sock)
 717 {
 718         struct sock *sk = sock->sk;
 719
 720         _enter("%p{%p}", sock, sk);
 721
 722         if (!sk)
 723                 return 0;
 724
 725         sock->sk = NULL;
 726
 727         return rxrpc_release_sock(sk);
 728 }
 729
 730 /*
 731  * RxRPC network protocol
 732  */
 733 static const struct proto_ops rxrpc_rpc_ops = {
 734         .family         = PF_RXRPC,
 735         .owner          = THIS_MODULE,
 736         .release        = rxrpc_release,
 737         .bind           = rxrpc_bind,
 738         .connect        = rxrpc_connect,
 739         .socketpair     = sock_no_socketpair,
 740         .accept         = sock_no_accept,
 741         .getname        = sock_no_getname,
 742         .poll           = rxrpc_poll,
 743         .ioctl          = sock_no_ioctl,
 744         .listen         = rxrpc_listen,
 745         .shutdown       = rxrpc_shutdown,
 746         .setsockopt     = rxrpc_setsockopt,
 747         .getsockopt     = sock_no_getsockopt,
 748         .sendmsg        = rxrpc_sendmsg,
 749         .recvmsg        = rxrpc_recvmsg,
 750         .mmap           = sock_no_mmap,
 751         .sendpage       = sock_no_sendpage,
 752 };
 753
 754 static struct proto rxrpc_proto = {
 755         .name           = "RXRPC",
 756         .owner          = THIS_MODULE,
 757         .obj_size       = sizeof(struct rxrpc_sock),
 758         .max_header     = sizeof(struct rxrpc_wire_header),
 759 };
 760
 761 static const struct net_proto_family rxrpc_family_ops = {
 762         .family = PF_RXRPC,
 763         .create = rxrpc_create,
 764         .owner  = THIS_MODULE,
 765 };
 766
 767 /*
 768  * initialise and register the RxRPC protocol
 769  */
 770 static int __init af_rxrpc_init(void)
 771 {
 772         int ret = -1;
 773         unsigned int tmp;
 774
 775         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 776
 777         get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch));
 778         rxrpc_epoch |= RXRPC_RANDOM_EPOCH;
 779         get_random_bytes(&tmp, sizeof(tmp));
 780         tmp &= 0x3fffffff;
 781         if (tmp == 0)
 782                 tmp = 1;
 783         idr_set_cursor(&rxrpc_client_conn_ids, tmp);
 784
 785         ret = -ENOMEM;
 786         rxrpc_call_jar = kmem_cache_create(
 787                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 788                 SLAB_HWCACHE_ALIGN, NULL);
 789         if (!rxrpc_call_jar) {
 790                 pr_notice("Failed to allocate call jar\n");
 791                 goto error_call_jar;
 792         }
 793
 794         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 795         if (!rxrpc_workqueue) {
 796                 pr_notice("Failed to allocate work queue\n");
 797                 goto error_work_queue;
 798         }
 799
 800         ret = rxrpc_init_security();
 801         if (ret < 0) {
 802                 pr_crit("Cannot initialise security\n");
 803                 goto error_security;
 804         }
 805
 806         ret = proto_register(&rxrpc_proto, 1);
 807         if (ret < 0) {
 808                 pr_crit("Cannot register protocol\n");
 809                 goto error_proto;
 810         }
 811
 812         ret = sock_register(&rxrpc_family_ops);
 813         if (ret < 0) {
 814                 pr_crit("Cannot register socket family\n");
 815                 goto error_sock;
 816         }
 817
 818         ret = register_key_type(&key_type_rxrpc);
 819         if (ret < 0) {
 820                 pr_crit("Cannot register client key type\n");
 821                 goto error_key_type;
 822         }
 823
 824         ret = register_key_type(&key_type_rxrpc_s);
 825         if (ret < 0) {
 826                 pr_crit("Cannot register server key type\n");
 827                 goto error_key_type_s;
 828         }
 829
 830         ret = rxrpc_sysctl_init();
 831         if (ret < 0) {
 832                 pr_crit("Cannot register sysctls\n");
 833                 goto error_sysctls;
 834         }
 835
 836 #ifdef CONFIG_PROC_FS
 837         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
 838         proc_create("rxrpc_conns", 0, init_net.proc_net,
 839                     &rxrpc_connection_seq_fops);
 840 #endif
 841         return 0;
 842
 843 error_sysctls:
 844         unregister_key_type(&key_type_rxrpc_s);
 845 error_key_type_s:
 846         unregister_key_type(&key_type_rxrpc);
 847 error_key_type:
 848         sock_unregister(PF_RXRPC);
 849 error_sock:
 850         proto_unregister(&rxrpc_proto);
 851 error_proto:
 852         rxrpc_exit_security();
 853 error_security:
 854         destroy_workqueue(rxrpc_workqueue);
 855 error_work_queue:
 856         kmem_cache_destroy(rxrpc_call_jar);
 857 error_call_jar:
 858         return ret;
 859 }
 860
 861 /*
 862  * unregister the RxRPC protocol
 863  */
 864 static void __exit af_rxrpc_exit(void)
 865 {
 866         _enter("");
 867         rxrpc_sysctl_exit();
 868         unregister_key_type(&key_type_rxrpc_s);
 869         unregister_key_type(&key_type_rxrpc);
 870         sock_unregister(PF_RXRPC);
 871         proto_unregister(&rxrpc_proto);
 872         rxrpc_destroy_all_calls();
 873         rxrpc_destroy_all_connections();
 874         ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
 875         ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
 876         rxrpc_destroy_all_locals();
 877
 878         remove_proc_entry("rxrpc_conns", init_net.proc_net);
 879         remove_proc_entry("rxrpc_calls", init_net.proc_net);
 880         destroy_workqueue(rxrpc_workqueue);
 881         rxrpc_exit_security();
 882         kmem_cache_destroy(rxrpc_call_jar);
 883         _leave("");
 884 }
 885
 886 module_init(af_rxrpc_init);
 887 module_exit(af_rxrpc_exit);