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(rxrpc_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->sk_sleep && waitqueue_active(sk->sk_sleep))
  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 @ %u.%u.%u.%u",
 100                        ntohs(srx->transport.sin.sin_port),
 101                        NIPQUAD(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;
 288                 }
 289         } else {
 290                 trans = rx->trans;
 291                 if (!trans) {
 292                         call = ERR_PTR(-ENOTCONN);
 293                         goto out;
 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         release_sock(&rx->sk);
 319         _leave(" = %p", call);
 320         return call;
 321 }
 322
 323 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 324
 325 /**
 326  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 327  * @call: The call to end
 328  *
 329  * Allow a kernel service to end a call it was using.  The call must be
 330  * complete before this is called (the call should be aborted if necessary).
 331  */
 332 void rxrpc_kernel_end_call(struct rxrpc_call *call)
 333 {
 334         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 335         rxrpc_remove_user_ID(call->socket, call);
 336         rxrpc_put_call(call);
 337 }
 338
 339 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 340
 341 /**
 342  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
 343  * @sock: The socket to intercept received messages on
 344  * @interceptor: The function to pass the messages to
 345  *
 346  * Allow a kernel service to intercept messages heading for the Rx queue on an
 347  * RxRPC socket.  They get passed to the specified function instead.
 348  * @interceptor should free the socket buffers it is given.  @interceptor is
 349  * called with the socket receive queue spinlock held and softirqs disabled -
 350  * this ensures that the messages will be delivered in the right order.
 351  */
 352 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
 353                                         rxrpc_interceptor_t interceptor)
 354 {
 355         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 356
 357         _enter("");
 358         rx->interceptor = interceptor;
 359 }
 360
 361 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
 362
 363 /*
 364  * connect an RxRPC socket
 365  * - this just targets it at a specific destination; no actual connection
 366  *   negotiation takes place
 367  */
 368 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 369                          int addr_len, int flags)
 370 {
 371         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 372         struct sock *sk = sock->sk;
 373         struct rxrpc_transport *trans;
 374         struct rxrpc_local *local;
 375         struct rxrpc_sock *rx = rxrpc_sk(sk);
 376         int ret;
 377
 378         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 379
 380         ret = rxrpc_validate_address(rx, srx, addr_len);
 381         if (ret < 0) {
 382                 _leave(" = %d [bad addr]", ret);
 383                 return ret;
 384         }
 385
 386         lock_sock(&rx->sk);
 387
 388         switch (rx->sk.sk_state) {
 389         case RXRPC_UNCONNECTED:
 390                 /* find a local transport endpoint if we don't have one already */
 391                 ASSERTCMP(rx->local, ==, NULL);
 392                 rx->srx.srx_family = AF_RXRPC;
 393                 rx->srx.srx_service = 0;
 394                 rx->srx.transport_type = srx->transport_type;
 395                 rx->srx.transport_len = sizeof(sa_family_t);
 396                 rx->srx.transport.family = srx->transport.family;
 397                 local = rxrpc_lookup_local(&rx->srx);
 398                 if (IS_ERR(local)) {
 399                         release_sock(&rx->sk);
 400                         return PTR_ERR(local);
 401                 }
 402                 rx->local = local;
 403                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 404         case RXRPC_CLIENT_BOUND:
 405                 break;
 406         case RXRPC_CLIENT_CONNECTED:
 407                 release_sock(&rx->sk);
 408                 return -EISCONN;
 409         default:
 410                 release_sock(&rx->sk);
 411                 return -EBUSY; /* server sockets can't connect as well */
 412         }
 413
 414         trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
 415                                         GFP_KERNEL);
 416         if (IS_ERR(trans)) {
 417                 release_sock(&rx->sk);
 418                 _leave(" = %ld", PTR_ERR(trans));
 419                 return PTR_ERR(trans);
 420         }
 421
 422         rx->trans = trans;
 423         rx->service_id = htons(srx->srx_service);
 424         rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
 425
 426         release_sock(&rx->sk);
 427         return 0;
 428 }
 429
 430 /*
 431  * send a message through an RxRPC socket
 432  * - in a client this does a number of things:
 433  *   - finds/sets up a connection for the security specified (if any)
 434  *   - initiates a call (ID in control data)
 435  *   - ends the request phase of a call (if MSG_MORE is not set)
 436  *   - sends a call data packet
 437  *   - may send an abort (abort code in control data)
 438  */
 439 static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
 440                          struct msghdr *m, size_t len)
 441 {
 442         struct rxrpc_transport *trans;
 443         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 444         int ret;
 445
 446         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 447
 448         if (m->msg_flags & MSG_OOB)
 449                 return -EOPNOTSUPP;
 450
 451         if (m->msg_name) {
 452                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 453                 if (ret < 0) {
 454                         _leave(" = %d [bad addr]", ret);
 455                         return ret;
 456                 }
 457         }
 458
 459         trans = NULL;
 460         lock_sock(&rx->sk);
 461
 462         if (m->msg_name) {
 463                 ret = -EISCONN;
 464                 trans = rxrpc_name_to_transport(sock, m->msg_name,
 465                                                 m->msg_namelen, 0, GFP_KERNEL);
 466                 if (IS_ERR(trans)) {
 467                         ret = PTR_ERR(trans);
 468                         trans = NULL;
 469                         goto out;
 470                 }
 471         } else {
 472                 trans = rx->trans;
 473                 if (trans)
 474                         atomic_inc(&trans->usage);
 475         }
 476
 477         switch (rx->sk.sk_state) {
 478         case RXRPC_SERVER_LISTENING:
 479                 if (!m->msg_name) {
 480                         ret = rxrpc_server_sendmsg(iocb, rx, m, len);
 481                         break;
 482                 }
 483         case RXRPC_SERVER_BOUND:
 484         case RXRPC_CLIENT_BOUND:
 485                 if (!m->msg_name) {
 486                         ret = -ENOTCONN;
 487                         break;
 488                 }
 489         case RXRPC_CLIENT_CONNECTED:
 490                 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
 491                 break;
 492         default:
 493                 ret = -ENOTCONN;
 494                 break;
 495         }
 496
 497 out:
 498         release_sock(&rx->sk);
 499         if (trans)
 500                 rxrpc_put_transport(trans);
 501         _leave(" = %d", ret);
 502         return ret;
 503 }
 504
 505 /*
 506  * set RxRPC socket options
 507  */
 508 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 509                             char __user *optval, int optlen)
 510 {
 511         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 512         unsigned min_sec_level;
 513         int ret;
 514
 515         _enter(",%d,%d,,%d", level, optname, optlen);
 516
 517         lock_sock(&rx->sk);
 518         ret = -EOPNOTSUPP;
 519
 520         if (level == SOL_RXRPC) {
 521                 switch (optname) {
 522                 case RXRPC_EXCLUSIVE_CONNECTION:
 523                         ret = -EINVAL;
 524                         if (optlen != 0)
 525                                 goto error;
 526                         ret = -EISCONN;
 527                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 528                                 goto error;
 529                         set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
 530                         goto success;
 531
 532                 case RXRPC_SECURITY_KEY:
 533                         ret = -EINVAL;
 534                         if (rx->key)
 535                                 goto error;
 536                         ret = -EISCONN;
 537                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 538                                 goto error;
 539                         ret = rxrpc_request_key(rx, optval, optlen);
 540                         goto error;
 541
 542                 case RXRPC_SECURITY_KEYRING:
 543                         ret = -EINVAL;
 544                         if (rx->key)
 545                                 goto error;
 546                         ret = -EISCONN;
 547                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 548                                 goto error;
 549                         ret = rxrpc_server_keyring(rx, optval, optlen);
 550                         goto error;
 551
 552                 case RXRPC_MIN_SECURITY_LEVEL:
 553                         ret = -EINVAL;
 554                         if (optlen != sizeof(unsigned))
 555                                 goto error;
 556                         ret = -EISCONN;
 557                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 558                                 goto error;
 559                         ret = get_user(min_sec_level,
 560                                        (unsigned __user *) optval);
 561                         if (ret < 0)
 562                                 goto error;
 563                         ret = -EINVAL;
 564                         if (min_sec_level > RXRPC_SECURITY_MAX)
 565                                 goto error;
 566                         rx->min_sec_level = min_sec_level;
 567                         goto success;
 568
 569                 default:
 570                         break;
 571                 }
 572         }
 573
 574 success:
 575         ret = 0;
 576 error:
 577         release_sock(&rx->sk);
 578         return ret;
 579 }
 580
 581 /*
 582  * permit an RxRPC socket to be polled
 583  */
 584 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 585                                poll_table *wait)
 586 {
 587         unsigned int mask;
 588         struct sock *sk = sock->sk;
 589
 590         poll_wait(file, sk->sk_sleep, wait);
 591         mask = 0;
 592
 593         /* the socket is readable if there are any messages waiting on the Rx
 594          * queue */
 595         if (!skb_queue_empty(&sk->sk_receive_queue))
 596                 mask |= POLLIN | POLLRDNORM;
 597
 598         /* the socket is writable if there is space to add new data to the
 599          * socket; there is no guarantee that any particular call in progress
 600          * on the socket may have space in the Tx ACK window */
 601         if (rxrpc_writable(sk))
 602                 mask |= POLLOUT | POLLWRNORM;
 603
 604         return mask;
 605 }
 606
 607 /*
 608  * create an RxRPC socket
 609  */
 610 static int rxrpc_create(struct net *net, struct socket *sock, int protocol)
 611 {
 612         struct rxrpc_sock *rx;
 613         struct sock *sk;
 614
 615         _enter("%p,%d", sock, protocol);
 616
 617         if (net != &init_net)
 618                 return -EAFNOSUPPORT;
 619
 620         /* we support transport protocol UDP only */
 621         if (protocol != PF_INET)
 622                 return -EPROTONOSUPPORT;
 623
 624         if (sock->type != SOCK_DGRAM)
 625                 return -ESOCKTNOSUPPORT;
 626
 627         sock->ops = &rxrpc_rpc_ops;
 628         sock->state = SS_UNCONNECTED;
 629
 630         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
 631         if (!sk)
 632                 return -ENOMEM;
 633
 634         sock_init_data(sock, sk);
 635         sk->sk_state            = RXRPC_UNCONNECTED;
 636         sk->sk_write_space      = rxrpc_write_space;
 637         sk->sk_max_ack_backlog  = sysctl_rxrpc_max_qlen;
 638         sk->sk_destruct         = rxrpc_sock_destructor;
 639
 640         rx = rxrpc_sk(sk);
 641         rx->proto = protocol;
 642         rx->calls = RB_ROOT;
 643
 644         INIT_LIST_HEAD(&rx->listen_link);
 645         INIT_LIST_HEAD(&rx->secureq);
 646         INIT_LIST_HEAD(&rx->acceptq);
 647         rwlock_init(&rx->call_lock);
 648         memset(&rx->srx, 0, sizeof(rx->srx));
 649
 650         _leave(" = 0 [%p]", rx);
 651         return 0;
 652 }
 653
 654 /*
 655  * RxRPC socket destructor
 656  */
 657 static void rxrpc_sock_destructor(struct sock *sk)
 658 {
 659         _enter("%p", sk);
 660
 661         rxrpc_purge_queue(&sk->sk_receive_queue);
 662
 663         BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
 664         BUG_TRAP(sk_unhashed(sk));
 665         BUG_TRAP(!sk->sk_socket);
 666
 667         if (!sock_flag(sk, SOCK_DEAD)) {
 668                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 669                 return;
 670         }
 671 }
 672
 673 /*
 674  * release an RxRPC socket
 675  */
 676 static int rxrpc_release_sock(struct sock *sk)
 677 {
 678         struct rxrpc_sock *rx = rxrpc_sk(sk);
 679
 680         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 681
 682         /* declare the socket closed for business */
 683         sock_orphan(sk);
 684         sk->sk_shutdown = SHUTDOWN_MASK;
 685
 686         spin_lock_bh(&sk->sk_receive_queue.lock);
 687         sk->sk_state = RXRPC_CLOSE;
 688         spin_unlock_bh(&sk->sk_receive_queue.lock);
 689
 690         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 691
 692         if (!list_empty(&rx->listen_link)) {
 693                 write_lock_bh(&rx->local->services_lock);
 694                 list_del(&rx->listen_link);
 695                 write_unlock_bh(&rx->local->services_lock);
 696         }
 697
 698         /* try to flush out this socket */
 699         rxrpc_release_calls_on_socket(rx);
 700         flush_workqueue(rxrpc_workqueue);
 701         rxrpc_purge_queue(&sk->sk_receive_queue);
 702
 703         if (rx->conn) {
 704                 rxrpc_put_connection(rx->conn);
 705                 rx->conn = NULL;
 706         }
 707
 708         if (rx->bundle) {
 709                 rxrpc_put_bundle(rx->trans, rx->bundle);
 710                 rx->bundle = NULL;
 711         }
 712         if (rx->trans) {
 713                 rxrpc_put_transport(rx->trans);
 714                 rx->trans = NULL;
 715         }
 716         if (rx->local) {
 717                 rxrpc_put_local(rx->local);
 718                 rx->local = NULL;
 719         }
 720
 721         key_put(rx->key);
 722         rx->key = NULL;
 723         key_put(rx->securities);
 724         rx->securities = NULL;
 725         sock_put(sk);
 726
 727         _leave(" = 0");
 728         return 0;
 729 }
 730
 731 /*
 732  * release an RxRPC BSD socket on close() or equivalent
 733  */
 734 static int rxrpc_release(struct socket *sock)
 735 {
 736         struct sock *sk = sock->sk;
 737
 738         _enter("%p{%p}", sock, sk);
 739
 740         if (!sk)
 741                 return 0;
 742
 743         sock->sk = NULL;
 744
 745         return rxrpc_release_sock(sk);
 746 }
 747
 748 /*
 749  * RxRPC network protocol
 750  */
 751 static const struct proto_ops rxrpc_rpc_ops = {
 752         .family         = PF_UNIX,
 753         .owner          = THIS_MODULE,
 754         .release        = rxrpc_release,
 755         .bind           = rxrpc_bind,
 756         .connect        = rxrpc_connect,
 757         .socketpair     = sock_no_socketpair,
 758         .accept         = sock_no_accept,
 759         .getname        = sock_no_getname,
 760         .poll           = rxrpc_poll,
 761         .ioctl          = sock_no_ioctl,
 762         .listen         = rxrpc_listen,
 763         .shutdown       = sock_no_shutdown,
 764         .setsockopt     = rxrpc_setsockopt,
 765         .getsockopt     = sock_no_getsockopt,
 766         .sendmsg        = rxrpc_sendmsg,
 767         .recvmsg        = rxrpc_recvmsg,
 768         .mmap           = sock_no_mmap,
 769         .sendpage       = sock_no_sendpage,
 770 };
 771
 772 static struct proto rxrpc_proto = {
 773         .name           = "RXRPC",
 774         .owner          = THIS_MODULE,
 775         .obj_size       = sizeof(struct rxrpc_sock),
 776         .max_header     = sizeof(struct rxrpc_header),
 777 };
 778
 779 static struct net_proto_family rxrpc_family_ops = {
 780         .family = PF_RXRPC,
 781         .create = rxrpc_create,
 782         .owner  = THIS_MODULE,
 783 };
 784
 785 /*
 786  * initialise and register the RxRPC protocol
 787  */
 788 static int __init af_rxrpc_init(void)
 789 {
 790         struct sk_buff *dummy_skb;
 791         int ret = -1;
 792
 793         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
 794
 795         rxrpc_epoch = htonl(get_seconds());
 796
 797         ret = -ENOMEM;
 798         rxrpc_call_jar = kmem_cache_create(
 799                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 800                 SLAB_HWCACHE_ALIGN, NULL);
 801         if (!rxrpc_call_jar) {
 802                 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
 803                 goto error_call_jar;
 804         }
 805
 806         rxrpc_workqueue = create_workqueue("krxrpcd");
 807         if (!rxrpc_workqueue) {
 808                 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
 809                 goto error_work_queue;
 810         }
 811
 812         ret = proto_register(&rxrpc_proto, 1);
 813         if (ret < 0) {
 814                 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
 815                 goto error_proto;
 816         }
 817
 818         ret = sock_register(&rxrpc_family_ops);
 819         if (ret < 0) {
 820                 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
 821                 goto error_sock;
 822         }
 823
 824         ret = register_key_type(&key_type_rxrpc);
 825         if (ret < 0) {
 826                 printk(KERN_CRIT "RxRPC: 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                 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
 833                 goto error_key_type_s;
 834         }
 835
 836 #ifdef CONFIG_PROC_FS
 837         proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops);
 838         proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops);
 839 #endif
 840         return 0;
 841
 842 error_key_type_s:
 843         unregister_key_type(&key_type_rxrpc);
 844 error_key_type:
 845         sock_unregister(PF_RXRPC);
 846 error_sock:
 847         proto_unregister(&rxrpc_proto);
 848 error_proto:
 849         destroy_workqueue(rxrpc_workqueue);
 850 error_work_queue:
 851         kmem_cache_destroy(rxrpc_call_jar);
 852 error_call_jar:
 853         return ret;
 854 }
 855
 856 /*
 857  * unregister the RxRPC protocol
 858  */
 859 static void __exit af_rxrpc_exit(void)
 860 {
 861         _enter("");
 862         unregister_key_type(&key_type_rxrpc_s);
 863         unregister_key_type(&key_type_rxrpc);
 864         sock_unregister(PF_RXRPC);
 865         proto_unregister(&rxrpc_proto);
 866         rxrpc_destroy_all_calls();
 867         rxrpc_destroy_all_connections();
 868         rxrpc_destroy_all_transports();
 869         rxrpc_destroy_all_peers();
 870         rxrpc_destroy_all_locals();
 871
 872         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 873
 874         _debug("flush scheduled work");
 875         flush_workqueue(rxrpc_workqueue);
 876         proc_net_remove(&init_net, "rxrpc_conns");
 877         proc_net_remove(&init_net, "rxrpc_calls");
 878         destroy_workqueue(rxrpc_workqueue);
 879         kmem_cache_destroy(rxrpc_call_jar);
 880         _leave("");
 881 }
 882
 883 module_init(af_rxrpc_init);
 884 module_exit(af_rxrpc_exit);