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