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 #include <linux/module.h>
  13 #include <linux/net.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/poll.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/key-type.h>
  18 #include <net/net_namespace.h>
  19 #include <net/sock.h>
  20 #include <net/af_rxrpc.h>
  21 #include "ar-internal.h"
  22
  23 MODULE_DESCRIPTION("RxRPC network protocol");
  24 MODULE_AUTHOR("Red Hat, Inc.");
  25 MODULE_LICENSE("GPL");
  26 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  27
  28 unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  29 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
  30 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
  31
  32 static int sysctl_rxrpc_max_qlen __read_mostly = 10;
  33
  34 static struct proto rxrpc_proto;
  35 static const struct proto_ops rxrpc_rpc_ops;
  36
  37 /* local epoch for detecting local-end reset */
  38 __be32 rxrpc_epoch;
  39
  40 /* current debugging ID */
  41 atomic_t rxrpc_debug_id;
  42
  43 /* count of skbs currently in use */
  44 atomic_t rxrpc_n_skbs;
  45
  46 struct workqueue_struct *rxrpc_workqueue;
  47
  48 static void rxrpc_sock_destructor(struct sock *);
  49
  50 /*
  51  * see if an RxRPC socket is currently writable
  52  */
  53 static inline int rxrpc_writable(struct sock *sk)
  54 {
  55         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
  56 }
  57
  58 /*
  59  * wait for write bufferage to become available
  60  */
  61 static void rxrpc_write_space(struct sock *sk)
  62 {
  63         _enter("%p", sk);
  64         read_lock(&sk->sk_callback_lock);
  65         if (rxrpc_writable(sk)) {
  66                 if (sk_has_sleeper(sk))
  67                         wake_up_interruptible(sk->sk_sleep);
  68                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
  69         }
  70         read_unlock(&sk->sk_callback_lock);
  71 }
  72
  73 /*
  74  * validate an RxRPC address
  75  */
  76 static int rxrpc_validate_address(struct rxrpc_sock *rx,
  77                                   struct sockaddr_rxrpc *srx,
  78                                   int len)
  79 {
  80         if (len < sizeof(struct sockaddr_rxrpc))
  81                 return -EINVAL;
  82
  83         if (srx->srx_family != AF_RXRPC)
  84                 return -EAFNOSUPPORT;
  85
  86         if (srx->transport_type != SOCK_DGRAM)
  87                 return -ESOCKTNOSUPPORT;
  88
  89         len -= offsetof(struct sockaddr_rxrpc, transport);
  90         if (srx->transport_len < sizeof(sa_family_t) ||
  91             srx->transport_len > len)
  92                 return -EINVAL;
  93
  94         if (srx->transport.family != rx->proto)
  95                 return -EAFNOSUPPORT;
  96
  97         switch (srx->transport.family) {
  98         case AF_INET:
  99                 _debug("INET: %x @ %pI4",
 100                        ntohs(srx->transport.sin.sin_port),
 101                        &srx->transport.sin.sin_addr);
 102                 if (srx->transport_len > 8)
 103                         memset((void *)&srx->transport + 8, 0,
 104                                srx->transport_len - 8);
 105                 break;
 106
 107         case AF_INET6:
 108         default:
 109                 return -EAFNOSUPPORT;
 110         }
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * bind a local address to an RxRPC socket
 117  */
 118 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 119 {
 120         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
 121         struct sock *sk = sock->sk;
 122         struct rxrpc_local *local;
 123         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
 124         __be16 service_id;
 125         int ret;
 126
 127         _enter("%p,%p,%d", rx, saddr, len);
 128
 129         ret = rxrpc_validate_address(rx, srx, len);
 130         if (ret < 0)
 131                 goto error;
 132
 133         lock_sock(&rx->sk);
 134
 135         if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
 136                 ret = -EINVAL;
 137                 goto error_unlock;
 138         }
 139
 140         memcpy(&rx->srx, srx, sizeof(rx->srx));
 141
 142         /* find a local transport endpoint if we don't have one already */
 143         local = rxrpc_lookup_local(&rx->srx);
 144         if (IS_ERR(local)) {
 145                 ret = PTR_ERR(local);
 146                 goto error_unlock;
 147         }
 148
 149         rx->local = local;
 150         if (srx->srx_service) {
 151                 service_id = htons(srx->srx_service);
 152                 write_lock_bh(&local->services_lock);
 153                 list_for_each_entry(prx, &local->services, listen_link) {
 154                         if (prx->service_id == service_id)
 155                                 goto service_in_use;
 156                 }
 157
 158                 rx->service_id = service_id;
 159                 list_add_tail(&rx->listen_link, &local->services);
 160                 write_unlock_bh(&local->services_lock);
 161
 162                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
 163         } else {
 164                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 165         }
 166
 167         release_sock(&rx->sk);
 168         _leave(" = 0");
 169         return 0;
 170
 171 service_in_use:
 172         ret = -EADDRINUSE;
 173         write_unlock_bh(&local->services_lock);
 174 error_unlock:
 175         release_sock(&rx->sk);
 176 error:
 177         _leave(" = %d", ret);
 178         return ret;
 179 }
 180
 181 /*
 182  * set the number of pending calls permitted on a listening socket
 183  */
 184 static int rxrpc_listen(struct socket *sock, int backlog)
 185 {
 186         struct sock *sk = sock->sk;
 187         struct rxrpc_sock *rx = rxrpc_sk(sk);
 188         int ret;
 189
 190         _enter("%p,%d", rx, backlog);
 191
 192         lock_sock(&rx->sk);
 193
 194         switch (rx->sk.sk_state) {
 195         case RXRPC_UNCONNECTED:
 196                 ret = -EADDRNOTAVAIL;
 197                 break;
 198         case RXRPC_CLIENT_BOUND:
 199         case RXRPC_CLIENT_CONNECTED:
 200         default:
 201                 ret = -EBUSY;
 202                 break;
 203         case RXRPC_SERVER_BOUND:
 204                 ASSERT(rx->local != NULL);
 205                 sk->sk_max_ack_backlog = backlog;
 206                 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 207                 ret = 0;
 208                 break;
 209         }
 210
 211         release_sock(&rx->sk);
 212         _leave(" = %d", ret);
 213         return ret;
 214 }
 215
 216 /*
 217  * find a transport by address
 218  */
 219 static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
 220                                                        struct sockaddr *addr,
 221                                                        int addr_len, int flags,
 222                                                        gfp_t gfp)
 223 {
 224         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 225         struct rxrpc_transport *trans;
 226         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 227         struct rxrpc_peer *peer;
 228
 229         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 230
 231         ASSERT(rx->local != NULL);
 232         ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
 233
 234         if (rx->srx.transport_type != srx->transport_type)
 235                 return ERR_PTR(-ESOCKTNOSUPPORT);
 236         if (rx->srx.transport.family != srx->transport.family)
 237                 return ERR_PTR(-EAFNOSUPPORT);
 238
 239         /* find a remote transport endpoint from the local one */
 240         peer = rxrpc_get_peer(srx, gfp);
 241         if (IS_ERR(peer))
 242                 return ERR_CAST(peer);
 243
 244         /* find a transport */
 245         trans = rxrpc_get_transport(rx->local, peer, gfp);
 246         rxrpc_put_peer(peer);
 247         _leave(" = %p", trans);
 248         return trans;
 249 }
 250
 251 /**
 252  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 253  * @sock: The socket on which to make the call
 254  * @srx: The address of the peer to contact (defaults to socket setting)
 255  * @key: The security context to use (defaults to socket setting)
 256  * @user_call_ID: The ID to use
 257  *
 258  * Allow a kernel service to begin a call on the nominated socket.  This just
 259  * sets up all the internal tracking structures and allocates connection and
 260  * call IDs as appropriate.  The call to be used is returned.
 261  *
 262  * The default socket destination address and security may be overridden by
 263  * supplying @srx and @key.
 264  */
 265 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 266                                            struct sockaddr_rxrpc *srx,
 267                                            struct key *key,
 268                                            unsigned long user_call_ID,
 269                                            gfp_t gfp)
 270 {
 271         struct rxrpc_conn_bundle *bundle;
 272         struct rxrpc_transport *trans;
 273         struct rxrpc_call *call;
 274         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 275         __be16 service_id;
 276
 277         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 278
 279         lock_sock(&rx->sk);
 280
 281         if (srx) {
 282                 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
 283                                                 sizeof(*srx), 0, gfp);
 284                 if (IS_ERR(trans)) {
 285                         call = ERR_CAST(trans);
 286                         trans = NULL;
 287                         goto out_notrans;
 288                 }
 289         } else {
 290                 trans = rx->trans;
 291                 if (!trans) {
 292                         call = ERR_PTR(-ENOTCONN);
 293                         goto out_notrans;
 294                 }
 295                 atomic_inc(&trans->usage);
 296         }
 297
 298         service_id = rx->service_id;
 299         if (srx)
 300                 service_id = htons(srx->srx_service);
 301
 302         if (!key)
 303                 key = rx->key;
 304         if (key && !key->payload.data)
 305                 key = NULL; /* a no-security key */
 306
 307         bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
 308         if (IS_ERR(bundle)) {
 309                 call = ERR_CAST(bundle);
 310                 goto out;
 311         }
 312
 313         call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
 314                                      gfp);
 315         rxrpc_put_bundle(trans, bundle);
 316 out:
 317         rxrpc_put_transport(trans);
 318 out_notrans:
 319         release_sock(&rx->sk);
 320         _leave(" = %p", call);
 321         return call;
 322 }
 323
 324 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 325
 326 /**
 327  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 328  * @call: The call to end
 329  *
 330  * Allow a kernel service to end a call it was using.  The call must be
 331  * complete before this is called (the call should be aborted if necessary).
 332  */
 333 void rxrpc_kernel_end_call(struct rxrpc_call *call)
 334 {
 335         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 336         rxrpc_remove_user_ID(call->socket, call);
 337         rxrpc_put_call(call);
 338 }
 339
 340 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 341
 342 /**
 343  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
 344  * @sock: The socket to intercept received messages on
 345  * @interceptor: The function to pass the messages to
 346  *
 347  * Allow a kernel service to intercept messages heading for the Rx queue on an
 348  * RxRPC socket.  They get passed to the specified function instead.
 349  * @interceptor should free the socket buffers it is given.  @interceptor is
 350  * called with the socket receive queue spinlock held and softirqs disabled -
 351  * this ensures that the messages will be delivered in the right order.
 352  */
 353 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
 354                                         rxrpc_interceptor_t interceptor)
 355 {
 356         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 357
 358         _enter("");
 359         rx->interceptor = interceptor;
 360 }
 361
 362 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
 363
 364 /*
 365  * connect an RxRPC socket
 366  * - this just targets it at a specific destination; no actual connection
 367  *   negotiation takes place
 368  */
 369 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 370                          int addr_len, int flags)
 371 {
 372         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 373         struct sock *sk = sock->sk;
 374         struct rxrpc_transport *trans;
 375         struct rxrpc_local *local;
 376         struct rxrpc_sock *rx = rxrpc_sk(sk);
 377         int ret;
 378
 379         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 380
 381         ret = rxrpc_validate_address(rx, srx, addr_len);
 382         if (ret < 0) {
 383                 _leave(" = %d [bad addr]", ret);
 384                 return ret;
 385         }
 386
 387         lock_sock(&rx->sk);
 388
 389         switch (rx->sk.sk_state) {
 390         case RXRPC_UNCONNECTED:
 391                 /* find a local transport endpoint if we don't have one already */
 392                 ASSERTCMP(rx->local, ==, NULL);
 393                 rx->srx.srx_family = AF_RXRPC;
 394                 rx->srx.srx_service = 0;
 395                 rx->srx.transport_type = srx->transport_type;
 396                 rx->srx.transport_len = sizeof(sa_family_t);
 397                 rx->srx.transport.family = srx->transport.family;
 398                 local = rxrpc_lookup_local(&rx->srx);
 399                 if (IS_ERR(local)) {
 400                         release_sock(&rx->sk);
 401                         return PTR_ERR(local);
 402                 }
 403                 rx->local = local;
 404                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 405         case RXRPC_CLIENT_BOUND:
 406                 break;
 407         case RXRPC_CLIENT_CONNECTED:
 408                 release_sock(&rx->sk);
 409                 return -EISCONN;
 410         default:
 411                 release_sock(&rx->sk);
 412                 return -EBUSY; /* server sockets can't connect as well */
 413         }
 414
 415         trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
 416                                         GFP_KERNEL);
 417         if (IS_ERR(trans)) {
 418                 release_sock(&rx->sk);
 419                 _leave(" = %ld", PTR_ERR(trans));
 420                 return PTR_ERR(trans);
 421         }
 422
 423         rx->trans = trans;
 424         rx->service_id = htons(srx->srx_service);
 425         rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
 426
 427         release_sock(&rx->sk);
 428         return 0;
 429 }
 430
 431 /*
 432  * send a message through an RxRPC socket
 433  * - in a client this does a number of things:
 434  *   - finds/sets up a connection for the security specified (if any)
 435  *   - initiates a call (ID in control data)
 436  *   - ends the request phase of a call (if MSG_MORE is not set)
 437  *   - sends a call data packet
 438  *   - may send an abort (abort code in control data)
 439  */
 440 static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
 441                          struct msghdr *m, size_t len)
 442 {
 443         struct rxrpc_transport *trans;
 444         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 445         int ret;
 446
 447         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 448
 449         if (m->msg_flags & MSG_OOB)
 450                 return -EOPNOTSUPP;
 451
 452         if (m->msg_name) {
 453                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 454                 if (ret < 0) {
 455                         _leave(" = %d [bad addr]", ret);
 456                         return ret;
 457                 }
 458         }
 459
 460         trans = NULL;
 461         lock_sock(&rx->sk);
 462
 463         if (m->msg_name) {
 464                 ret = -EISCONN;
 465                 trans = rxrpc_name_to_transport(sock, m->msg_name,
 466                                                 m->msg_namelen, 0, GFP_KERNEL);
 467                 if (IS_ERR(trans)) {
 468                         ret = PTR_ERR(trans);
 469                         trans = NULL;
 470                         goto out;
 471                 }
 472         } else {
 473                 trans = rx->trans;
 474                 if (trans)
 475                         atomic_inc(&trans->usage);
 476         }
 477
 478         switch (rx->sk.sk_state) {
 479         case RXRPC_SERVER_LISTENING:
 480                 if (!m->msg_name) {
 481                         ret = rxrpc_server_sendmsg(iocb, rx, m, len);
 482                         break;
 483                 }
 484         case RXRPC_SERVER_BOUND:
 485         case RXRPC_CLIENT_BOUND:
 486                 if (!m->msg_name) {
 487                         ret = -ENOTCONN;
 488                         break;
 489                 }
 490         case RXRPC_CLIENT_CONNECTED:
 491                 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
 492                 break;
 493         default:
 494                 ret = -ENOTCONN;
 495                 break;
 496         }
 497
 498 out:
 499         release_sock(&rx->sk);
 500         if (trans)
 501                 rxrpc_put_transport(trans);
 502         _leave(" = %d", ret);
 503         return ret;
 504 }
 505
 506 /*
 507  * set RxRPC socket options
 508  */
 509 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 510                             char __user *optval, unsigned int optlen)
 511 {
 512         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 513         unsigned min_sec_level;
 514         int ret;
 515
 516         _enter(",%d,%d,,%d", level, optname, optlen);
 517
 518         lock_sock(&rx->sk);
 519         ret = -EOPNOTSUPP;
 520
 521         if (level == SOL_RXRPC) {
 522                 switch (optname) {
 523                 case RXRPC_EXCLUSIVE_CONNECTION:
 524                         ret = -EINVAL;
 525                         if (optlen != 0)
 526                                 goto error;
 527                         ret = -EISCONN;
 528                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 529                                 goto error;
 530                         set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
 531                         goto success;
 532
 533                 case RXRPC_SECURITY_KEY:
 534                         ret = -EINVAL;
 535                         if (rx->key)
 536                                 goto error;
 537                         ret = -EISCONN;
 538                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 539                                 goto error;
 540                         ret = rxrpc_request_key(rx, optval, optlen);
 541                         goto error;
 542
 543                 case RXRPC_SECURITY_KEYRING:
 544                         ret = -EINVAL;
 545                         if (rx->key)
 546                                 goto error;
 547                         ret = -EISCONN;
 548                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 549                                 goto error;
 550                         ret = rxrpc_server_keyring(rx, optval, optlen);
 551                         goto error;
 552
 553                 case RXRPC_MIN_SECURITY_LEVEL:
 554                         ret = -EINVAL;
 555                         if (optlen != sizeof(unsigned))
 556                                 goto error;
 557                         ret = -EISCONN;
 558                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 559                                 goto error;
 560                         ret = get_user(min_sec_level,
 561                                        (unsigned __user *) optval);
 562                         if (ret < 0)
 563                                 goto error;
 564                         ret = -EINVAL;
 565                         if (min_sec_level > RXRPC_SECURITY_MAX)
 566                                 goto error;
 567                         rx->min_sec_level = min_sec_level;
 568                         goto success;
 569
 570                 default:
 571                         break;
 572                 }
 573         }
 574
 575 success:
 576         ret = 0;
 577 error:
 578         release_sock(&rx->sk);
 579         return ret;
 580 }
 581
 582 /*
 583  * permit an RxRPC socket to be polled
 584  */
 585 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 586                                poll_table *wait)
 587 {
 588         unsigned int mask;
 589         struct sock *sk = sock->sk;
 590
 591         sock_poll_wait(file, sk->sk_sleep, wait);
 592         mask = 0;
 593
 594         /* the socket is readable if there are any messages waiting on the Rx
 595          * queue */
 596         if (!skb_queue_empty(&sk->sk_receive_queue))
 597                 mask |= POLLIN | POLLRDNORM;
 598
 599         /* the socket is writable if there is space to add new data to the
 600          * socket; there is no guarantee that any particular call in progress
 601          * on the socket may have space in the Tx ACK window */
 602         if (rxrpc_writable(sk))
 603                 mask |= POLLOUT | POLLWRNORM;
 604
 605         return mask;
 606 }
 607
 608 /*
 609  * create an RxRPC socket
 610  */
 611 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 612                         int kern)
 613 {
 614         struct rxrpc_sock *rx;
 615         struct sock *sk;
 616
 617         _enter("%p,%d", sock, protocol);
 618
 619         if (!net_eq(net, &init_net))
 620                 return -EAFNOSUPPORT;
 621
 622         /* we support transport protocol UDP only */
 623         if (protocol != PF_INET)
 624                 return -EPROTONOSUPPORT;
 625
 626         if (sock->type != SOCK_DGRAM)
 627                 return -ESOCKTNOSUPPORT;
 628
 629         sock->ops = &rxrpc_rpc_ops;
 630         sock->state = SS_UNCONNECTED;
 631
 632         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
 633         if (!sk)
 634                 return -ENOMEM;
 635
 636         sock_init_data(sock, sk);
 637         sk->sk_state            = RXRPC_UNCONNECTED;
 638         sk->sk_write_space      = rxrpc_write_space;
 639         sk->sk_max_ack_backlog  = sysctl_rxrpc_max_qlen;
 640         sk->sk_destruct         = rxrpc_sock_destructor;
 641
 642         rx = rxrpc_sk(sk);
 643         rx->proto = protocol;
 644         rx->calls = RB_ROOT;
 645
 646         INIT_LIST_HEAD(&rx->listen_link);
 647         INIT_LIST_HEAD(&rx->secureq);
 648         INIT_LIST_HEAD(&rx->acceptq);
 649         rwlock_init(&rx->call_lock);
 650         memset(&rx->srx, 0, sizeof(rx->srx));
 651
 652         _leave(" = 0 [%p]", rx);
 653         return 0;
 654 }
 655
 656 /*
 657  * RxRPC socket destructor
 658  */
 659 static void rxrpc_sock_destructor(struct sock *sk)
 660 {
 661         _enter("%p", sk);
 662
 663         rxrpc_purge_queue(&sk->sk_receive_queue);
 664
 665         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 666         WARN_ON(!sk_unhashed(sk));
 667         WARN_ON(sk->sk_socket);
 668
 669         if (!sock_flag(sk, SOCK_DEAD)) {
 670                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 671                 return;
 672         }
 673 }
 674
 675 /*
 676  * release an RxRPC socket
 677  */
 678 static int rxrpc_release_sock(struct sock *sk)
 679 {
 680         struct rxrpc_sock *rx = rxrpc_sk(sk);
 681
 682         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 683
 684         /* declare the socket closed for business */
 685         sock_orphan(sk);
 686         sk->sk_shutdown = SHUTDOWN_MASK;
 687
 688         spin_lock_bh(&sk->sk_receive_queue.lock);
 689         sk->sk_state = RXRPC_CLOSE;
 690         spin_unlock_bh(&sk->sk_receive_queue.lock);
 691
 692         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 693
 694         if (!list_empty(&rx->listen_link)) {
 695                 write_lock_bh(&rx->local->services_lock);
 696                 list_del(&rx->listen_link);
 697                 write_unlock_bh(&rx->local->services_lock);
 698         }
 699
 700         /* try to flush out this socket */
 701         rxrpc_release_calls_on_socket(rx);
 702         flush_workqueue(rxrpc_workqueue);
 703         rxrpc_purge_queue(&sk->sk_receive_queue);
 704
 705         if (rx->conn) {
 706                 rxrpc_put_connection(rx->conn);
 707                 rx->conn = NULL;
 708         }
 709
 710         if (rx->bundle) {
 711                 rxrpc_put_bundle(rx->trans, rx->bundle);
 712                 rx->bundle = NULL;
 713         }
 714         if (rx->trans) {
 715                 rxrpc_put_transport(rx->trans);
 716                 rx->trans = NULL;
 717         }
 718         if (rx->local) {
 719                 rxrpc_put_local(rx->local);
 720                 rx->local = NULL;
 721         }
 722
 723         key_put(rx->key);
 724         rx->key = NULL;
 725         key_put(rx->securities);
 726         rx->securities = NULL;
 727         sock_put(sk);
 728
 729         _leave(" = 0");
 730         return 0;
 731 }
 732
 733 /*
 734  * release an RxRPC BSD socket on close() or equivalent
 735  */
 736 static int rxrpc_release(struct socket *sock)
 737 {
 738         struct sock *sk = sock->sk;
 739
 740         _enter("%p{%p}", sock, sk);
 741
 742         if (!sk)
 743                 return 0;
 744
 745         sock->sk = NULL;
 746
 747         return rxrpc_release_sock(sk);
 748 }
 749
 750 /*
 751  * RxRPC network protocol
 752  */
 753 static const struct proto_ops rxrpc_rpc_ops = {
 754         .family         = PF_UNIX,
 755         .owner          = THIS_MODULE,
 756         .release        = rxrpc_release,
 757         .bind           = rxrpc_bind,
 758         .connect        = rxrpc_connect,
 759         .socketpair     = sock_no_socketpair,
 760         .accept         = sock_no_accept,
 761         .getname        = sock_no_getname,
 762         .poll           = rxrpc_poll,
 763         .ioctl          = sock_no_ioctl,
 764         .listen         = rxrpc_listen,
 765         .shutdown       = sock_no_shutdown,
 766         .setsockopt     = rxrpc_setsockopt,
 767         .getsockopt     = sock_no_getsockopt,
 768         .sendmsg        = rxrpc_sendmsg,
 769         .recvmsg        = rxrpc_recvmsg,
 770         .mmap           = sock_no_mmap,
 771         .sendpage       = sock_no_sendpage,
 772 };
 773
 774 static struct proto rxrpc_proto = {
 775         .name           = "RXRPC",
 776         .owner          = THIS_MODULE,
 777         .obj_size       = sizeof(struct rxrpc_sock),
 778         .max_header     = sizeof(struct rxrpc_header),
 779 };
 780
 781 static const struct net_proto_family rxrpc_family_ops = {
 782         .family = PF_RXRPC,
 783         .create = rxrpc_create,
 784         .owner  = THIS_MODULE,
 785 };
 786
 787 /*
 788  * initialise and register the RxRPC protocol
 789  */
 790 static int __init af_rxrpc_init(void)
 791 {
 792         struct sk_buff *dummy_skb;
 793         int ret = -1;
 794
 795         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
 796
 797         rxrpc_epoch = htonl(get_seconds());
 798
 799         ret = -ENOMEM;
 800         rxrpc_call_jar = kmem_cache_create(
 801                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 802                 SLAB_HWCACHE_ALIGN, NULL);
 803         if (!rxrpc_call_jar) {
 804                 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
 805                 goto error_call_jar;
 806         }
 807
 808         rxrpc_workqueue = create_workqueue("krxrpcd");
 809         if (!rxrpc_workqueue) {
 810                 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
 811                 goto error_work_queue;
 812         }
 813
 814         ret = proto_register(&rxrpc_proto, 1);
 815         if (ret < 0) {
 816                 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
 817                 goto error_proto;
 818         }
 819
 820         ret = sock_register(&rxrpc_family_ops);
 821         if (ret < 0) {
 822                 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
 823                 goto error_sock;
 824         }
 825
 826         ret = register_key_type(&key_type_rxrpc);
 827         if (ret < 0) {
 828                 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
 829                 goto error_key_type;
 830         }
 831
 832         ret = register_key_type(&key_type_rxrpc_s);
 833         if (ret < 0) {
 834                 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
 835                 goto error_key_type_s;
 836         }
 837
 838 #ifdef CONFIG_PROC_FS
 839         proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops);
 840         proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops);
 841 #endif
 842         return 0;
 843
 844 error_key_type_s:
 845         unregister_key_type(&key_type_rxrpc);
 846 error_key_type:
 847         sock_unregister(PF_RXRPC);
 848 error_sock:
 849         proto_unregister(&rxrpc_proto);
 850 error_proto:
 851         destroy_workqueue(rxrpc_workqueue);
 852 error_work_queue:
 853         kmem_cache_destroy(rxrpc_call_jar);
 854 error_call_jar:
 855         return ret;
 856 }
 857
 858 /*
 859  * unregister the RxRPC protocol
 860  */
 861 static void __exit af_rxrpc_exit(void)
 862 {
 863         _enter("");
 864         unregister_key_type(&key_type_rxrpc_s);
 865         unregister_key_type(&key_type_rxrpc);
 866         sock_unregister(PF_RXRPC);
 867         proto_unregister(&rxrpc_proto);
 868         rxrpc_destroy_all_calls();
 869         rxrpc_destroy_all_connections();
 870         rxrpc_destroy_all_transports();
 871         rxrpc_destroy_all_peers();
 872         rxrpc_destroy_all_locals();
 873
 874         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 875
 876         _debug("flush scheduled work");
 877         flush_workqueue(rxrpc_workqueue);
 878         proc_net_remove(&init_net, "rxrpc_conns");
 879         proc_net_remove(&init_net, "rxrpc_calls");
 880         destroy_workqueue(rxrpc_workqueue);
 881         kmem_cache_destroy(rxrpc_call_jar);
 882         _leave("");
 883 }
 884
 885 module_init(af_rxrpc_init);
 886 module_exit(af_rxrpc_exit);