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/kernel.h>
  14 #include <linux/net.h>
  15 #include <linux/slab.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/poll.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/key-type.h>
  20 #include <net/net_namespace.h>
  21 #include <net/sock.h>
  22 #include <net/af_rxrpc.h>
  23 #include "ar-internal.h"
  24
  25 MODULE_DESCRIPTION("RxRPC network protocol");
  26 MODULE_AUTHOR("Red Hat, Inc.");
  27 MODULE_LICENSE("GPL");
  28 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  29
  30 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  31 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
  32 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
  33
  34 static int sysctl_rxrpc_max_qlen __read_mostly = 10;
  35
  36 static struct proto rxrpc_proto;
  37 static const struct proto_ops rxrpc_rpc_ops;
  38
  39 /* local epoch for detecting local-end reset */
  40 __be32 rxrpc_epoch;
  41
  42 /* current debugging ID */
  43 atomic_t rxrpc_debug_id;
  44
  45 /* count of skbs currently in use */
  46 atomic_t rxrpc_n_skbs;
  47
  48 struct workqueue_struct *rxrpc_workqueue;
  49
  50 static void rxrpc_sock_destructor(struct sock *);
  51
  52 /*
  53  * see if an RxRPC socket is currently writable
  54  */
  55 static inline int rxrpc_writable(struct sock *sk)
  56 {
  57         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
  58 }
  59
  60 /*
  61  * wait for write bufferage to become available
  62  */
  63 static void rxrpc_write_space(struct sock *sk)
  64 {
  65         _enter("%p", sk);
  66         rcu_read_lock();
  67         if (rxrpc_writable(sk)) {
  68                 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
  69
  70                 if (wq_has_sleeper(wq))
  71                         wake_up_interruptible(&wq->wait);
  72                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
  73         }
  74         rcu_read_unlock();
  75 }
  76
  77 /*
  78  * validate an RxRPC address
  79  */
  80 static int rxrpc_validate_address(struct rxrpc_sock *rx,
  81                                   struct sockaddr_rxrpc *srx,
  82                                   int len)
  83 {
  84         if (len < sizeof(struct sockaddr_rxrpc))
  85                 return -EINVAL;
  86
  87         if (srx->srx_family != AF_RXRPC)
  88                 return -EAFNOSUPPORT;
  89
  90         if (srx->transport_type != SOCK_DGRAM)
  91                 return -ESOCKTNOSUPPORT;
  92
  93         len -= offsetof(struct sockaddr_rxrpc, transport);
  94         if (srx->transport_len < sizeof(sa_family_t) ||
  95             srx->transport_len > len)
  96                 return -EINVAL;
  97
  98         if (srx->transport.family != rx->proto)
  99                 return -EAFNOSUPPORT;
 100
 101         switch (srx->transport.family) {
 102         case AF_INET:
 103                 _debug("INET: %x @ %pI4",
 104                        ntohs(srx->transport.sin.sin_port),
 105                        &srx->transport.sin.sin_addr);
 106                 if (srx->transport_len > 8)
 107                         memset((void *)&srx->transport + 8, 0,
 108                                srx->transport_len - 8);
 109                 break;
 110
 111         case AF_INET6:
 112         default:
 113                 return -EAFNOSUPPORT;
 114         }
 115
 116         return 0;
 117 }
 118
 119 /*
 120  * bind a local address to an RxRPC socket
 121  */
 122 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 123 {
 124         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
 125         struct sock *sk = sock->sk;
 126         struct rxrpc_local *local;
 127         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
 128         __be16 service_id;
 129         int ret;
 130
 131         _enter("%p,%p,%d", rx, saddr, len);
 132
 133         ret = rxrpc_validate_address(rx, srx, len);
 134         if (ret < 0)
 135                 goto error;
 136
 137         lock_sock(&rx->sk);
 138
 139         if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
 140                 ret = -EINVAL;
 141                 goto error_unlock;
 142         }
 143
 144         memcpy(&rx->srx, srx, sizeof(rx->srx));
 145
 146         /* find a local transport endpoint if we don't have one already */
 147         local = rxrpc_lookup_local(&rx->srx);
 148         if (IS_ERR(local)) {
 149                 ret = PTR_ERR(local);
 150                 goto error_unlock;
 151         }
 152
 153         rx->local = local;
 154         if (srx->srx_service) {
 155                 service_id = htons(srx->srx_service);
 156                 write_lock_bh(&local->services_lock);
 157                 list_for_each_entry(prx, &local->services, listen_link) {
 158                         if (prx->service_id == service_id)
 159                                 goto service_in_use;
 160                 }
 161
 162                 rx->service_id = service_id;
 163                 list_add_tail(&rx->listen_link, &local->services);
 164                 write_unlock_bh(&local->services_lock);
 165
 166                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
 167         } else {
 168                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 169         }
 170
 171         release_sock(&rx->sk);
 172         _leave(" = 0");
 173         return 0;
 174
 175 service_in_use:
 176         ret = -EADDRINUSE;
 177         write_unlock_bh(&local->services_lock);
 178 error_unlock:
 179         release_sock(&rx->sk);
 180 error:
 181         _leave(" = %d", ret);
 182         return ret;
 183 }
 184
 185 /*
 186  * set the number of pending calls permitted on a listening socket
 187  */
 188 static int rxrpc_listen(struct socket *sock, int backlog)
 189 {
 190         struct sock *sk = sock->sk;
 191         struct rxrpc_sock *rx = rxrpc_sk(sk);
 192         int ret;
 193
 194         _enter("%p,%d", rx, backlog);
 195
 196         lock_sock(&rx->sk);
 197
 198         switch (rx->sk.sk_state) {
 199         case RXRPC_UNCONNECTED:
 200                 ret = -EADDRNOTAVAIL;
 201                 break;
 202         case RXRPC_CLIENT_BOUND:
 203         case RXRPC_CLIENT_CONNECTED:
 204         default:
 205                 ret = -EBUSY;
 206                 break;
 207         case RXRPC_SERVER_BOUND:
 208                 ASSERT(rx->local != NULL);
 209                 sk->sk_max_ack_backlog = backlog;
 210                 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 211                 ret = 0;
 212                 break;
 213         }
 214
 215         release_sock(&rx->sk);
 216         _leave(" = %d", ret);
 217         return ret;
 218 }
 219
 220 /*
 221  * find a transport by address
 222  */
 223 static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
 224                                                        struct sockaddr *addr,
 225                                                        int addr_len, int flags,
 226                                                        gfp_t gfp)
 227 {
 228         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 229         struct rxrpc_transport *trans;
 230         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 231         struct rxrpc_peer *peer;
 232
 233         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 234
 235         ASSERT(rx->local != NULL);
 236         ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
 237
 238         if (rx->srx.transport_type != srx->transport_type)
 239                 return ERR_PTR(-ESOCKTNOSUPPORT);
 240         if (rx->srx.transport.family != srx->transport.family)
 241                 return ERR_PTR(-EAFNOSUPPORT);
 242
 243         /* find a remote transport endpoint from the local one */
 244         peer = rxrpc_get_peer(srx, gfp);
 245         if (IS_ERR(peer))
 246                 return ERR_CAST(peer);
 247
 248         /* find a transport */
 249         trans = rxrpc_get_transport(rx->local, peer, gfp);
 250         rxrpc_put_peer(peer);
 251         _leave(" = %p", trans);
 252         return trans;
 253 }
 254
 255 /**
 256  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 257  * @sock: The socket on which to make the call
 258  * @srx: The address of the peer to contact (defaults to socket setting)
 259  * @key: The security context to use (defaults to socket setting)
 260  * @user_call_ID: The ID to use
 261  *
 262  * Allow a kernel service to begin a call on the nominated socket.  This just
 263  * sets up all the internal tracking structures and allocates connection and
 264  * call IDs as appropriate.  The call to be used is returned.
 265  *
 266  * The default socket destination address and security may be overridden by
 267  * supplying @srx and @key.
 268  */
 269 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 270                                            struct sockaddr_rxrpc *srx,
 271                                            struct key *key,
 272                                            unsigned long user_call_ID,
 273                                            gfp_t gfp)
 274 {
 275         struct rxrpc_conn_bundle *bundle;
 276         struct rxrpc_transport *trans;
 277         struct rxrpc_call *call;
 278         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 279         __be16 service_id;
 280
 281         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 282
 283         lock_sock(&rx->sk);
 284
 285         if (srx) {
 286                 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
 287                                                 sizeof(*srx), 0, gfp);
 288                 if (IS_ERR(trans)) {
 289                         call = ERR_CAST(trans);
 290                         trans = NULL;
 291                         goto out_notrans;
 292                 }
 293         } else {
 294                 trans = rx->trans;
 295                 if (!trans) {
 296                         call = ERR_PTR(-ENOTCONN);
 297                         goto out_notrans;
 298                 }
 299                 atomic_inc(&trans->usage);
 300         }
 301
 302         service_id = rx->service_id;
 303         if (srx)
 304                 service_id = htons(srx->srx_service);
 305
 306         if (!key)
 307                 key = rx->key;
 308         if (key && !key->payload.data)
 309                 key = NULL; /* a no-security key */
 310
 311         bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
 312         if (IS_ERR(bundle)) {
 313                 call = ERR_CAST(bundle);
 314                 goto out;
 315         }
 316
 317         call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
 318                                      gfp);
 319         rxrpc_put_bundle(trans, bundle);
 320 out:
 321         rxrpc_put_transport(trans);
 322 out_notrans:
 323         release_sock(&rx->sk);
 324         _leave(" = %p", call);
 325         return call;
 326 }
 327
 328 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 329
 330 /**
 331  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 332  * @call: The call to end
 333  *
 334  * Allow a kernel service to end a call it was using.  The call must be
 335  * complete before this is called (the call should be aborted if necessary).
 336  */
 337 void rxrpc_kernel_end_call(struct rxrpc_call *call)
 338 {
 339         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 340         rxrpc_remove_user_ID(call->socket, call);
 341         rxrpc_put_call(call);
 342 }
 343
 344 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 345
 346 /**
 347  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
 348  * @sock: The socket to intercept received messages on
 349  * @interceptor: The function to pass the messages to
 350  *
 351  * Allow a kernel service to intercept messages heading for the Rx queue on an
 352  * RxRPC socket.  They get passed to the specified function instead.
 353  * @interceptor should free the socket buffers it is given.  @interceptor is
 354  * called with the socket receive queue spinlock held and softirqs disabled -
 355  * this ensures that the messages will be delivered in the right order.
 356  */
 357 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
 358                                         rxrpc_interceptor_t interceptor)
 359 {
 360         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 361
 362         _enter("");
 363         rx->interceptor = interceptor;
 364 }
 365
 366 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
 367
 368 /*
 369  * connect an RxRPC socket
 370  * - this just targets it at a specific destination; no actual connection
 371  *   negotiation takes place
 372  */
 373 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 374                          int addr_len, int flags)
 375 {
 376         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 377         struct sock *sk = sock->sk;
 378         struct rxrpc_transport *trans;
 379         struct rxrpc_local *local;
 380         struct rxrpc_sock *rx = rxrpc_sk(sk);
 381         int ret;
 382
 383         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 384
 385         ret = rxrpc_validate_address(rx, srx, addr_len);
 386         if (ret < 0) {
 387                 _leave(" = %d [bad addr]", ret);
 388                 return ret;
 389         }
 390
 391         lock_sock(&rx->sk);
 392
 393         switch (rx->sk.sk_state) {
 394         case RXRPC_UNCONNECTED:
 395                 /* find a local transport endpoint if we don't have one already */
 396                 ASSERTCMP(rx->local, ==, NULL);
 397                 rx->srx.srx_family = AF_RXRPC;
 398                 rx->srx.srx_service = 0;
 399                 rx->srx.transport_type = srx->transport_type;
 400                 rx->srx.transport_len = sizeof(sa_family_t);
 401                 rx->srx.transport.family = srx->transport.family;
 402                 local = rxrpc_lookup_local(&rx->srx);
 403                 if (IS_ERR(local)) {
 404                         release_sock(&rx->sk);
 405                         return PTR_ERR(local);
 406                 }
 407                 rx->local = local;
 408                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 409         case RXRPC_CLIENT_BOUND:
 410                 break;
 411         case RXRPC_CLIENT_CONNECTED:
 412                 release_sock(&rx->sk);
 413                 return -EISCONN;
 414         default:
 415                 release_sock(&rx->sk);
 416                 return -EBUSY; /* server sockets can't connect as well */
 417         }
 418
 419         trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
 420                                         GFP_KERNEL);
 421         if (IS_ERR(trans)) {
 422                 release_sock(&rx->sk);
 423                 _leave(" = %ld", PTR_ERR(trans));
 424                 return PTR_ERR(trans);
 425         }
 426
 427         rx->trans = trans;
 428         rx->service_id = htons(srx->srx_service);
 429         rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
 430
 431         release_sock(&rx->sk);
 432         return 0;
 433 }
 434
 435 /*
 436  * send a message through an RxRPC socket
 437  * - in a client this does a number of things:
 438  *   - finds/sets up a connection for the security specified (if any)
 439  *   - initiates a call (ID in control data)
 440  *   - ends the request phase of a call (if MSG_MORE is not set)
 441  *   - sends a call data packet
 442  *   - may send an abort (abort code in control data)
 443  */
 444 static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
 445                          struct msghdr *m, size_t len)
 446 {
 447         struct rxrpc_transport *trans;
 448         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 449         int ret;
 450
 451         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 452
 453         if (m->msg_flags & MSG_OOB)
 454                 return -EOPNOTSUPP;
 455
 456         if (m->msg_name) {
 457                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 458                 if (ret < 0) {
 459                         _leave(" = %d [bad addr]", ret);
 460                         return ret;
 461                 }
 462         }
 463
 464         trans = NULL;
 465         lock_sock(&rx->sk);
 466
 467         if (m->msg_name) {
 468                 ret = -EISCONN;
 469                 trans = rxrpc_name_to_transport(sock, m->msg_name,
 470                                                 m->msg_namelen, 0, GFP_KERNEL);
 471                 if (IS_ERR(trans)) {
 472                         ret = PTR_ERR(trans);
 473                         trans = NULL;
 474                         goto out;
 475                 }
 476         } else {
 477                 trans = rx->trans;
 478                 if (trans)
 479                         atomic_inc(&trans->usage);
 480         }
 481
 482         switch (rx->sk.sk_state) {
 483         case RXRPC_SERVER_LISTENING:
 484                 if (!m->msg_name) {
 485                         ret = rxrpc_server_sendmsg(iocb, rx, m, len);
 486                         break;
 487                 }
 488         case RXRPC_SERVER_BOUND:
 489         case RXRPC_CLIENT_BOUND:
 490                 if (!m->msg_name) {
 491                         ret = -ENOTCONN;
 492                         break;
 493                 }
 494         case RXRPC_CLIENT_CONNECTED:
 495                 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
 496                 break;
 497         default:
 498                 ret = -ENOTCONN;
 499                 break;
 500         }
 501
 502 out:
 503         release_sock(&rx->sk);
 504         if (trans)
 505                 rxrpc_put_transport(trans);
 506         _leave(" = %d", ret);
 507         return ret;
 508 }
 509
 510 /*
 511  * set RxRPC socket options
 512  */
 513 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 514                             char __user *optval, unsigned int optlen)
 515 {
 516         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 517         unsigned int min_sec_level;
 518         int ret;
 519
 520         _enter(",%d,%d,,%d", level, optname, optlen);
 521
 522         lock_sock(&rx->sk);
 523         ret = -EOPNOTSUPP;
 524
 525         if (level == SOL_RXRPC) {
 526                 switch (optname) {
 527                 case RXRPC_EXCLUSIVE_CONNECTION:
 528                         ret = -EINVAL;
 529                         if (optlen != 0)
 530                                 goto error;
 531                         ret = -EISCONN;
 532                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 533                                 goto error;
 534                         set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
 535                         goto success;
 536
 537                 case RXRPC_SECURITY_KEY:
 538                         ret = -EINVAL;
 539                         if (rx->key)
 540                                 goto error;
 541                         ret = -EISCONN;
 542                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 543                                 goto error;
 544                         ret = rxrpc_request_key(rx, optval, optlen);
 545                         goto error;
 546
 547                 case RXRPC_SECURITY_KEYRING:
 548                         ret = -EINVAL;
 549                         if (rx->key)
 550                                 goto error;
 551                         ret = -EISCONN;
 552                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 553                                 goto error;
 554                         ret = rxrpc_server_keyring(rx, optval, optlen);
 555                         goto error;
 556
 557                 case RXRPC_MIN_SECURITY_LEVEL:
 558                         ret = -EINVAL;
 559                         if (optlen != sizeof(unsigned int))
 560                                 goto error;
 561                         ret = -EISCONN;
 562                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 563                                 goto error;
 564                         ret = get_user(min_sec_level,
 565                                        (unsigned int __user *) optval);
 566                         if (ret < 0)
 567                                 goto error;
 568                         ret = -EINVAL;
 569                         if (min_sec_level > RXRPC_SECURITY_MAX)
 570                                 goto error;
 571                         rx->min_sec_level = min_sec_level;
 572                         goto success;
 573
 574                 default:
 575                         break;
 576                 }
 577         }
 578
 579 success:
 580         ret = 0;
 581 error:
 582         release_sock(&rx->sk);
 583         return ret;
 584 }
 585
 586 /*
 587  * permit an RxRPC socket to be polled
 588  */
 589 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 590                                poll_table *wait)
 591 {
 592         unsigned int mask;
 593         struct sock *sk = sock->sk;
 594
 595         sock_poll_wait(file, sk_sleep(sk), wait);
 596         mask = 0;
 597
 598         /* the socket is readable if there are any messages waiting on the Rx
 599          * queue */
 600         if (!skb_queue_empty(&sk->sk_receive_queue))
 601                 mask |= POLLIN | POLLRDNORM;
 602
 603         /* the socket is writable if there is space to add new data to the
 604          * socket; there is no guarantee that any particular call in progress
 605          * on the socket may have space in the Tx ACK window */
 606         if (rxrpc_writable(sk))
 607                 mask |= POLLOUT | POLLWRNORM;
 608
 609         return mask;
 610 }
 611
 612 /*
 613  * create an RxRPC socket
 614  */
 615 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 616                         int kern)
 617 {
 618         struct rxrpc_sock *rx;
 619         struct sock *sk;
 620
 621         _enter("%p,%d", sock, protocol);
 622
 623         if (!net_eq(net, &init_net))
 624                 return -EAFNOSUPPORT;
 625
 626         /* we support transport protocol UDP only */
 627         if (protocol != PF_INET)
 628                 return -EPROTONOSUPPORT;
 629
 630         if (sock->type != SOCK_DGRAM)
 631                 return -ESOCKTNOSUPPORT;
 632
 633         sock->ops = &rxrpc_rpc_ops;
 634         sock->state = SS_UNCONNECTED;
 635
 636         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto);
 637         if (!sk)
 638                 return -ENOMEM;
 639
 640         sock_init_data(sock, sk);
 641         sk->sk_state            = RXRPC_UNCONNECTED;
 642         sk->sk_write_space      = rxrpc_write_space;
 643         sk->sk_max_ack_backlog  = sysctl_rxrpc_max_qlen;
 644         sk->sk_destruct         = rxrpc_sock_destructor;
 645
 646         rx = rxrpc_sk(sk);
 647         rx->proto = protocol;
 648         rx->calls = RB_ROOT;
 649
 650         INIT_LIST_HEAD(&rx->listen_link);
 651         INIT_LIST_HEAD(&rx->secureq);
 652         INIT_LIST_HEAD(&rx->acceptq);
 653         rwlock_init(&rx->call_lock);
 654         memset(&rx->srx, 0, sizeof(rx->srx));
 655
 656         _leave(" = 0 [%p]", rx);
 657         return 0;
 658 }
 659
 660 /*
 661  * RxRPC socket destructor
 662  */
 663 static void rxrpc_sock_destructor(struct sock *sk)
 664 {
 665         _enter("%p", sk);
 666
 667         rxrpc_purge_queue(&sk->sk_receive_queue);
 668
 669         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 670         WARN_ON(!sk_unhashed(sk));
 671         WARN_ON(sk->sk_socket);
 672
 673         if (!sock_flag(sk, SOCK_DEAD)) {
 674                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 675                 return;
 676         }
 677 }
 678
 679 /*
 680  * release an RxRPC socket
 681  */
 682 static int rxrpc_release_sock(struct sock *sk)
 683 {
 684         struct rxrpc_sock *rx = rxrpc_sk(sk);
 685
 686         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 687
 688         /* declare the socket closed for business */
 689         sock_orphan(sk);
 690         sk->sk_shutdown = SHUTDOWN_MASK;
 691
 692         spin_lock_bh(&sk->sk_receive_queue.lock);
 693         sk->sk_state = RXRPC_CLOSE;
 694         spin_unlock_bh(&sk->sk_receive_queue.lock);
 695
 696         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 697
 698         if (!list_empty(&rx->listen_link)) {
 699                 write_lock_bh(&rx->local->services_lock);
 700                 list_del(&rx->listen_link);
 701                 write_unlock_bh(&rx->local->services_lock);
 702         }
 703
 704         /* try to flush out this socket */
 705         rxrpc_release_calls_on_socket(rx);
 706         flush_workqueue(rxrpc_workqueue);
 707         rxrpc_purge_queue(&sk->sk_receive_queue);
 708
 709         if (rx->conn) {
 710                 rxrpc_put_connection(rx->conn);
 711                 rx->conn = NULL;
 712         }
 713
 714         if (rx->bundle) {
 715                 rxrpc_put_bundle(rx->trans, rx->bundle);
 716                 rx->bundle = NULL;
 717         }
 718         if (rx->trans) {
 719                 rxrpc_put_transport(rx->trans);
 720                 rx->trans = NULL;
 721         }
 722         if (rx->local) {
 723                 rxrpc_put_local(rx->local);
 724                 rx->local = NULL;
 725         }
 726
 727         key_put(rx->key);
 728         rx->key = NULL;
 729         key_put(rx->securities);
 730         rx->securities = NULL;
 731         sock_put(sk);
 732
 733         _leave(" = 0");
 734         return 0;
 735 }
 736
 737 /*
 738  * release an RxRPC BSD socket on close() or equivalent
 739  */
 740 static int rxrpc_release(struct socket *sock)
 741 {
 742         struct sock *sk = sock->sk;
 743
 744         _enter("%p{%p}", sock, sk);
 745
 746         if (!sk)
 747                 return 0;
 748
 749         sock->sk = NULL;
 750
 751         return rxrpc_release_sock(sk);
 752 }
 753
 754 /*
 755  * RxRPC network protocol
 756  */
 757 static const struct proto_ops rxrpc_rpc_ops = {
 758         .family         = PF_UNIX,
 759         .owner          = THIS_MODULE,
 760         .release        = rxrpc_release,
 761         .bind           = rxrpc_bind,
 762         .connect        = rxrpc_connect,
 763         .socketpair     = sock_no_socketpair,
 764         .accept         = sock_no_accept,
 765         .getname        = sock_no_getname,
 766         .poll           = rxrpc_poll,
 767         .ioctl          = sock_no_ioctl,
 768         .listen         = rxrpc_listen,
 769         .shutdown       = sock_no_shutdown,
 770         .setsockopt     = rxrpc_setsockopt,
 771         .getsockopt     = sock_no_getsockopt,
 772         .sendmsg        = rxrpc_sendmsg,
 773         .recvmsg        = rxrpc_recvmsg,
 774         .mmap           = sock_no_mmap,
 775         .sendpage       = sock_no_sendpage,
 776 };
 777
 778 static struct proto rxrpc_proto = {
 779         .name           = "RXRPC",
 780         .owner          = THIS_MODULE,
 781         .obj_size       = sizeof(struct rxrpc_sock),
 782         .max_header     = sizeof(struct rxrpc_header),
 783 };
 784
 785 static const struct net_proto_family rxrpc_family_ops = {
 786         .family = PF_RXRPC,
 787         .create = rxrpc_create,
 788         .owner  = THIS_MODULE,
 789 };
 790
 791 /*
 792  * initialise and register the RxRPC protocol
 793  */
 794 static int __init af_rxrpc_init(void)
 795 {
 796         int ret = -1;
 797
 798         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 799
 800         rxrpc_epoch = htonl(get_seconds());
 801
 802         ret = -ENOMEM;
 803         rxrpc_call_jar = kmem_cache_create(
 804                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 805                 SLAB_HWCACHE_ALIGN, NULL);
 806         if (!rxrpc_call_jar) {
 807                 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
 808                 goto error_call_jar;
 809         }
 810
 811         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 812         if (!rxrpc_workqueue) {
 813                 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
 814                 goto error_work_queue;
 815         }
 816
 817         ret = proto_register(&rxrpc_proto, 1);
 818         if (ret < 0) {
 819                 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
 820                 goto error_proto;
 821         }
 822
 823         ret = sock_register(&rxrpc_family_ops);
 824         if (ret < 0) {
 825                 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
 826                 goto error_sock;
 827         }
 828
 829         ret = register_key_type(&key_type_rxrpc);
 830         if (ret < 0) {
 831                 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
 832                 goto error_key_type;
 833         }
 834
 835         ret = register_key_type(&key_type_rxrpc_s);
 836         if (ret < 0) {
 837                 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
 838                 goto error_key_type_s;
 839         }
 840
 841         ret = rxrpc_sysctl_init();
 842         if (ret < 0) {
 843                 printk(KERN_CRIT "RxRPC: Cannot register sysctls\n");
 844                 goto error_sysctls;
 845         }
 846
 847 #ifdef CONFIG_PROC_FS
 848         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
 849         proc_create("rxrpc_conns", 0, init_net.proc_net,
 850                     &rxrpc_connection_seq_fops);
 851 #endif
 852         return 0;
 853
 854 error_sysctls:
 855         unregister_key_type(&key_type_rxrpc_s);
 856 error_key_type_s:
 857         unregister_key_type(&key_type_rxrpc);
 858 error_key_type:
 859         sock_unregister(PF_RXRPC);
 860 error_sock:
 861         proto_unregister(&rxrpc_proto);
 862 error_proto:
 863         destroy_workqueue(rxrpc_workqueue);
 864 error_work_queue:
 865         kmem_cache_destroy(rxrpc_call_jar);
 866 error_call_jar:
 867         return ret;
 868 }
 869
 870 /*
 871  * unregister the RxRPC protocol
 872  */
 873 static void __exit af_rxrpc_exit(void)
 874 {
 875         _enter("");
 876         rxrpc_sysctl_exit();
 877         unregister_key_type(&key_type_rxrpc_s);
 878         unregister_key_type(&key_type_rxrpc);
 879         sock_unregister(PF_RXRPC);
 880         proto_unregister(&rxrpc_proto);
 881         rxrpc_destroy_all_calls();
 882         rxrpc_destroy_all_connections();
 883         rxrpc_destroy_all_transports();
 884         rxrpc_destroy_all_peers();
 885         rxrpc_destroy_all_locals();
 886
 887         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 888
 889         _debug("flush scheduled work");
 890         flush_workqueue(rxrpc_workqueue);
 891         remove_proc_entry("rxrpc_conns", init_net.proc_net);
 892         remove_proc_entry("rxrpc_calls", init_net.proc_net);
 893         destroy_workqueue(rxrpc_workqueue);
 894         kmem_cache_destroy(rxrpc_call_jar);
 895         _leave("");
 896 }
 897
 898 module_init(af_rxrpc_init);
 899 module_exit(af_rxrpc_exit);