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         /* The socket has been unlocked. */
 294         if (!IS_ERR(call))
 295                 call->notify_rx = notify_rx;
 296
 297         mutex_unlock(&call->user_mutex);
 298         _leave(" = %p", call);
 299         return call;
 300 }
 301 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 302
 303 /**
 304  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 305  * @sock: The socket the call is on
 306  * @call: The call to end
 307  *
 308  * Allow a kernel service to end a call it was using.  The call must be
 309  * complete before this is called (the call should be aborted if necessary).
 310  */
 311 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
 312 {
 313         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 314
 315         mutex_lock(&call->user_mutex);
 316         rxrpc_release_call(rxrpc_sk(sock->sk), call);
 317         mutex_unlock(&call->user_mutex);
 318         rxrpc_put_call(call, rxrpc_call_put_kernel);
 319 }
 320 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 321
 322 /**
 323  * rxrpc_kernel_new_call_notification - Get notifications of new calls
 324  * @sock: The socket to intercept received messages on
 325  * @notify_new_call: Function to be called when new calls appear
 326  * @discard_new_call: Function to discard preallocated calls
 327  *
 328  * Allow a kernel service to be given notifications about new calls.
 329  */
 330 void rxrpc_kernel_new_call_notification(
 331         struct socket *sock,
 332         rxrpc_notify_new_call_t notify_new_call,
 333         rxrpc_discard_new_call_t discard_new_call)
 334 {
 335         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 336
 337         rx->notify_new_call = notify_new_call;
 338         rx->discard_new_call = discard_new_call;
 339 }
 340 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 341
 342 /*
 343  * connect an RxRPC socket
 344  * - this just targets it at a specific destination; no actual connection
 345  *   negotiation takes place
 346  */
 347 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 348                          int addr_len, int flags)
 349 {
 350         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 351         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 352         int ret;
 353
 354         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 355
 356         ret = rxrpc_validate_address(rx, srx, addr_len);
 357         if (ret < 0) {
 358                 _leave(" = %d [bad addr]", ret);
 359                 return ret;
 360         }
 361
 362         lock_sock(&rx->sk);
 363
 364         ret = -EISCONN;
 365         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 366                 goto error;
 367
 368         switch (rx->sk.sk_state) {
 369         case RXRPC_UNBOUND:
 370                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 371         case RXRPC_CLIENT_UNBOUND:
 372         case RXRPC_CLIENT_BOUND:
 373                 break;
 374         default:
 375                 ret = -EBUSY;
 376                 goto error;
 377         }
 378
 379         rx->connect_srx = *srx;
 380         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 381         ret = 0;
 382
 383 error:
 384         release_sock(&rx->sk);
 385         return ret;
 386 }
 387
 388 /*
 389  * send a message through an RxRPC socket
 390  * - in a client this does a number of things:
 391  *   - finds/sets up a connection for the security specified (if any)
 392  *   - initiates a call (ID in control data)
 393  *   - ends the request phase of a call (if MSG_MORE is not set)
 394  *   - sends a call data packet
 395  *   - may send an abort (abort code in control data)
 396  */
 397 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 398 {
 399         struct rxrpc_local *local;
 400         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 401         int ret;
 402
 403         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 404
 405         if (m->msg_flags & MSG_OOB)
 406                 return -EOPNOTSUPP;
 407
 408         if (m->msg_name) {
 409                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 410                 if (ret < 0) {
 411                         _leave(" = %d [bad addr]", ret);
 412                         return ret;
 413                 }
 414         }
 415
 416         lock_sock(&rx->sk);
 417
 418         switch (rx->sk.sk_state) {
 419         case RXRPC_UNBOUND:
 420                 rx->srx.srx_family = AF_RXRPC;
 421                 rx->srx.srx_service = 0;
 422                 rx->srx.transport_type = SOCK_DGRAM;
 423                 rx->srx.transport.family = rx->family;
 424                 switch (rx->family) {
 425                 case AF_INET:
 426                         rx->srx.transport_len = sizeof(struct sockaddr_in);
 427                         break;
 428 #ifdef CONFIG_AF_RXRPC_IPV6
 429                 case AF_INET6:
 430                         rx->srx.transport_len = sizeof(struct sockaddr_in6);
 431                         break;
 432 #endif
 433                 default:
 434                         ret = -EAFNOSUPPORT;
 435                         goto error_unlock;
 436                 }
 437                 local = rxrpc_lookup_local(&rx->srx);
 438                 if (IS_ERR(local)) {
 439                         ret = PTR_ERR(local);
 440                         goto error_unlock;
 441                 }
 442
 443                 rx->local = local;
 444                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 445                 /* Fall through */
 446
 447         case RXRPC_CLIENT_UNBOUND:
 448         case RXRPC_CLIENT_BOUND:
 449                 if (!m->msg_name &&
 450                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 451                         m->msg_name = &rx->connect_srx;
 452                         m->msg_namelen = sizeof(rx->connect_srx);
 453                 }
 454         case RXRPC_SERVER_BOUND:
 455         case RXRPC_SERVER_LISTENING:
 456                 ret = rxrpc_do_sendmsg(rx, m, len);
 457                 /* The socket has been unlocked */
 458                 goto out;
 459         default:
 460                 ret = -EINVAL;
 461                 goto error_unlock;
 462         }
 463
 464 error_unlock:
 465         release_sock(&rx->sk);
 466 out:
 467         _leave(" = %d", ret);
 468         return ret;
 469 }
 470
 471 /*
 472  * set RxRPC socket options
 473  */
 474 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 475                             char __user *optval, unsigned int optlen)
 476 {
 477         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 478         unsigned int min_sec_level;
 479         int ret;
 480
 481         _enter(",%d,%d,,%d", level, optname, optlen);
 482
 483         lock_sock(&rx->sk);
 484         ret = -EOPNOTSUPP;
 485
 486         if (level == SOL_RXRPC) {
 487                 switch (optname) {
 488                 case RXRPC_EXCLUSIVE_CONNECTION:
 489                         ret = -EINVAL;
 490                         if (optlen != 0)
 491                                 goto error;
 492                         ret = -EISCONN;
 493                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 494                                 goto error;
 495                         rx->exclusive = true;
 496                         goto success;
 497
 498                 case RXRPC_SECURITY_KEY:
 499                         ret = -EINVAL;
 500                         if (rx->key)
 501                                 goto error;
 502                         ret = -EISCONN;
 503                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 504                                 goto error;
 505                         ret = rxrpc_request_key(rx, optval, optlen);
 506                         goto error;
 507
 508                 case RXRPC_SECURITY_KEYRING:
 509                         ret = -EINVAL;
 510                         if (rx->key)
 511                                 goto error;
 512                         ret = -EISCONN;
 513                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 514                                 goto error;
 515                         ret = rxrpc_server_keyring(rx, optval, optlen);
 516                         goto error;
 517
 518                 case RXRPC_MIN_SECURITY_LEVEL:
 519                         ret = -EINVAL;
 520                         if (optlen != sizeof(unsigned int))
 521                                 goto error;
 522                         ret = -EISCONN;
 523                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 524                                 goto error;
 525                         ret = get_user(min_sec_level,
 526                                        (unsigned int __user *) optval);
 527                         if (ret < 0)
 528                                 goto error;
 529                         ret = -EINVAL;
 530                         if (min_sec_level > RXRPC_SECURITY_MAX)
 531                                 goto error;
 532                         rx->min_sec_level = min_sec_level;
 533                         goto success;
 534
 535                 default:
 536                         break;
 537                 }
 538         }
 539
 540 success:
 541         ret = 0;
 542 error:
 543         release_sock(&rx->sk);
 544         return ret;
 545 }
 546
 547 /*
 548  * permit an RxRPC socket to be polled
 549  */
 550 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 551                                poll_table *wait)
 552 {
 553         struct sock *sk = sock->sk;
 554         struct rxrpc_sock *rx = rxrpc_sk(sk);
 555         unsigned int mask;
 556
 557         sock_poll_wait(file, sk_sleep(sk), wait);
 558         mask = 0;
 559
 560         /* the socket is readable if there are any messages waiting on the Rx
 561          * queue */
 562         if (!list_empty(&rx->recvmsg_q))
 563                 mask |= POLLIN | POLLRDNORM;
 564
 565         /* the socket is writable if there is space to add new data to the
 566          * socket; there is no guarantee that any particular call in progress
 567          * on the socket may have space in the Tx ACK window */
 568         if (rxrpc_writable(sk))
 569                 mask |= POLLOUT | POLLWRNORM;
 570
 571         return mask;
 572 }
 573
 574 /*
 575  * create an RxRPC socket
 576  */
 577 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 578                         int kern)
 579 {
 580         struct rxrpc_sock *rx;
 581         struct sock *sk;
 582
 583         _enter("%p,%d", sock, protocol);
 584
 585         if (!net_eq(net, &init_net))
 586                 return -EAFNOSUPPORT;
 587
 588         /* we support transport protocol UDP/UDP6 only */
 589         if (protocol != PF_INET &&
 590             IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
 591                 return -EPROTONOSUPPORT;
 592
 593         if (sock->type != SOCK_DGRAM)
 594                 return -ESOCKTNOSUPPORT;
 595
 596         sock->ops = &rxrpc_rpc_ops;
 597         sock->state = SS_UNCONNECTED;
 598
 599         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 600         if (!sk)
 601                 return -ENOMEM;
 602
 603         sock_init_data(sock, sk);
 604         sock_set_flag(sk, SOCK_RCU_FREE);
 605         sk->sk_state            = RXRPC_UNBOUND;
 606         sk->sk_write_space      = rxrpc_write_space;
 607         sk->sk_max_ack_backlog  = 0;
 608         sk->sk_destruct         = rxrpc_sock_destructor;
 609
 610         rx = rxrpc_sk(sk);
 611         rx->family = protocol;
 612         rx->calls = RB_ROOT;
 613
 614         spin_lock_init(&rx->incoming_lock);
 615         INIT_LIST_HEAD(&rx->sock_calls);
 616         INIT_LIST_HEAD(&rx->to_be_accepted);
 617         INIT_LIST_HEAD(&rx->recvmsg_q);
 618         rwlock_init(&rx->recvmsg_lock);
 619         rwlock_init(&rx->call_lock);
 620         memset(&rx->srx, 0, sizeof(rx->srx));
 621
 622         _leave(" = 0 [%p]", rx);
 623         return 0;
 624 }
 625
 626 /*
 627  * Kill all the calls on a socket and shut it down.
 628  */
 629 static int rxrpc_shutdown(struct socket *sock, int flags)
 630 {
 631         struct sock *sk = sock->sk;
 632         struct rxrpc_sock *rx = rxrpc_sk(sk);
 633         int ret = 0;
 634
 635         _enter("%p,%d", sk, flags);
 636
 637         if (flags != SHUT_RDWR)
 638                 return -EOPNOTSUPP;
 639         if (sk->sk_state == RXRPC_CLOSE)
 640                 return -ESHUTDOWN;
 641
 642         lock_sock(sk);
 643
 644         spin_lock_bh(&sk->sk_receive_queue.lock);
 645         if (sk->sk_state < RXRPC_CLOSE) {
 646                 sk->sk_state = RXRPC_CLOSE;
 647                 sk->sk_shutdown = SHUTDOWN_MASK;
 648         } else {
 649                 ret = -ESHUTDOWN;
 650         }
 651         spin_unlock_bh(&sk->sk_receive_queue.lock);
 652
 653         rxrpc_discard_prealloc(rx);
 654
 655         release_sock(sk);
 656         return ret;
 657 }
 658
 659 /*
 660  * RxRPC socket destructor
 661  */
 662 static void rxrpc_sock_destructor(struct sock *sk)
 663 {
 664         _enter("%p", sk);
 665
 666         rxrpc_purge_queue(&sk->sk_receive_queue);
 667
 668         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 669         WARN_ON(!sk_unhashed(sk));
 670         WARN_ON(sk->sk_socket);
 671
 672         if (!sock_flag(sk, SOCK_DEAD)) {
 673                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 674                 return;
 675         }
 676 }
 677
 678 /*
 679  * release an RxRPC socket
 680  */
 681 static int rxrpc_release_sock(struct sock *sk)
 682 {
 683         struct rxrpc_sock *rx = rxrpc_sk(sk);
 684
 685         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 686
 687         /* declare the socket closed for business */
 688         sock_orphan(sk);
 689         sk->sk_shutdown = SHUTDOWN_MASK;
 690
 691         spin_lock_bh(&sk->sk_receive_queue.lock);
 692         sk->sk_state = RXRPC_CLOSE;
 693         spin_unlock_bh(&sk->sk_receive_queue.lock);
 694
 695         if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
 696                 write_lock(&rx->local->services_lock);
 697                 rcu_assign_pointer(rx->local->service, NULL);
 698                 write_unlock(&rx->local->services_lock);
 699         }
 700
 701         /* try to flush out this socket */
 702         rxrpc_discard_prealloc(rx);
 703         rxrpc_release_calls_on_socket(rx);
 704         flush_workqueue(rxrpc_workqueue);
 705         rxrpc_purge_queue(&sk->sk_receive_queue);
 706
 707         rxrpc_put_local(rx->local);
 708         rx->local = NULL;
 709         key_put(rx->key);
 710         rx->key = NULL;
 711         key_put(rx->securities);
 712         rx->securities = NULL;
 713         sock_put(sk);
 714
 715         _leave(" = 0");
 716         return 0;
 717 }
 718
 719 /*
 720  * release an RxRPC BSD socket on close() or equivalent
 721  */
 722 static int rxrpc_release(struct socket *sock)
 723 {
 724         struct sock *sk = sock->sk;
 725
 726         _enter("%p{%p}", sock, sk);
 727
 728         if (!sk)
 729                 return 0;
 730
 731         sock->sk = NULL;
 732
 733         return rxrpc_release_sock(sk);
 734 }
 735
 736 /*
 737  * RxRPC network protocol
 738  */
 739 static const struct proto_ops rxrpc_rpc_ops = {
 740         .family         = PF_RXRPC,
 741         .owner          = THIS_MODULE,
 742         .release        = rxrpc_release,
 743         .bind           = rxrpc_bind,
 744         .connect        = rxrpc_connect,
 745         .socketpair     = sock_no_socketpair,
 746         .accept         = sock_no_accept,
 747         .getname        = sock_no_getname,
 748         .poll           = rxrpc_poll,
 749         .ioctl          = sock_no_ioctl,
 750         .listen         = rxrpc_listen,
 751         .shutdown       = rxrpc_shutdown,
 752         .setsockopt     = rxrpc_setsockopt,
 753         .getsockopt     = sock_no_getsockopt,
 754         .sendmsg        = rxrpc_sendmsg,
 755         .recvmsg        = rxrpc_recvmsg,
 756         .mmap           = sock_no_mmap,
 757         .sendpage       = sock_no_sendpage,
 758 };
 759
 760 static struct proto rxrpc_proto = {
 761         .name           = "RXRPC",
 762         .owner          = THIS_MODULE,
 763         .obj_size       = sizeof(struct rxrpc_sock),
 764         .max_header     = sizeof(struct rxrpc_wire_header),
 765 };
 766
 767 static const struct net_proto_family rxrpc_family_ops = {
 768         .family = PF_RXRPC,
 769         .create = rxrpc_create,
 770         .owner  = THIS_MODULE,
 771 };
 772
 773 /*
 774  * initialise and register the RxRPC protocol
 775  */
 776 static int __init af_rxrpc_init(void)
 777 {
 778         int ret = -1;
 779         unsigned int tmp;
 780
 781         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 782
 783         get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch));
 784         rxrpc_epoch |= RXRPC_RANDOM_EPOCH;
 785         get_random_bytes(&tmp, sizeof(tmp));
 786         tmp &= 0x3fffffff;
 787         if (tmp == 0)
 788                 tmp = 1;
 789         idr_set_cursor(&rxrpc_client_conn_ids, tmp);
 790
 791         ret = -ENOMEM;
 792         rxrpc_call_jar = kmem_cache_create(
 793                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 794                 SLAB_HWCACHE_ALIGN, NULL);
 795         if (!rxrpc_call_jar) {
 796                 pr_notice("Failed to allocate call jar\n");
 797                 goto error_call_jar;
 798         }
 799
 800         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 801         if (!rxrpc_workqueue) {
 802                 pr_notice("Failed to allocate work queue\n");
 803                 goto error_work_queue;
 804         }
 805
 806         ret = rxrpc_init_security();
 807         if (ret < 0) {
 808                 pr_crit("Cannot initialise security\n");
 809                 goto error_security;
 810         }
 811
 812         ret = proto_register(&rxrpc_proto, 1);
 813         if (ret < 0) {
 814                 pr_crit("Cannot register protocol\n");
 815                 goto error_proto;
 816         }
 817
 818         ret = sock_register(&rxrpc_family_ops);
 819         if (ret < 0) {
 820                 pr_crit("Cannot register socket family\n");
 821                 goto error_sock;
 822         }
 823
 824         ret = register_key_type(&key_type_rxrpc);
 825         if (ret < 0) {
 826                 pr_crit("Cannot register client key type\n");
 827                 goto error_key_type;
 828         }
 829
 830         ret = register_key_type(&key_type_rxrpc_s);
 831         if (ret < 0) {
 832                 pr_crit("Cannot register server key type\n");
 833                 goto error_key_type_s;
 834         }
 835
 836         ret = rxrpc_sysctl_init();
 837         if (ret < 0) {
 838                 pr_crit("Cannot register sysctls\n");
 839                 goto error_sysctls;
 840         }
 841
 842 #ifdef CONFIG_PROC_FS
 843         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
 844         proc_create("rxrpc_conns", 0, init_net.proc_net,
 845                     &rxrpc_connection_seq_fops);
 846 #endif
 847         return 0;
 848
 849 error_sysctls:
 850         unregister_key_type(&key_type_rxrpc_s);
 851 error_key_type_s:
 852         unregister_key_type(&key_type_rxrpc);
 853 error_key_type:
 854         sock_unregister(PF_RXRPC);
 855 error_sock:
 856         proto_unregister(&rxrpc_proto);
 857 error_proto:
 858         rxrpc_exit_security();
 859 error_security:
 860         destroy_workqueue(rxrpc_workqueue);
 861 error_work_queue:
 862         kmem_cache_destroy(rxrpc_call_jar);
 863 error_call_jar:
 864         return ret;
 865 }
 866
 867 /*
 868  * unregister the RxRPC protocol
 869  */
 870 static void __exit af_rxrpc_exit(void)
 871 {
 872         _enter("");
 873         rxrpc_sysctl_exit();
 874         unregister_key_type(&key_type_rxrpc_s);
 875         unregister_key_type(&key_type_rxrpc);
 876         sock_unregister(PF_RXRPC);
 877         proto_unregister(&rxrpc_proto);
 878         rxrpc_destroy_all_calls();
 879         rxrpc_destroy_all_connections();
 880         ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
 881         ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
 882         rxrpc_destroy_all_locals();
 883
 884         remove_proc_entry("rxrpc_conns", init_net.proc_net);
 885         remove_proc_entry("rxrpc_calls", init_net.proc_net);
 886         destroy_workqueue(rxrpc_workqueue);
 887         rxrpc_exit_security();
 888         kmem_cache_destroy(rxrpc_call_jar);
 889         _leave("");
 890 }
 891
 892 module_init(af_rxrpc_init);
 893 module_exit(af_rxrpc_exit);