net/rxrpc/af_rxrpc.c

   1 /* AF_RXRPC implementation
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/net.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/poll.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/key-type.h>
  22 #include <net/net_namespace.h>
  23 #include <net/sock.h>
  24 #include <net/af_rxrpc.h>
  25 #include "ar-internal.h"
  26
  27 MODULE_DESCRIPTION("RxRPC network protocol");
  28 MODULE_AUTHOR("Red Hat, Inc.");
  29 MODULE_LICENSE("GPL");
  30 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  31
  32 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  33 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
  34 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
  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 u32 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 (skwq_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         unsigned int tail;
  85
  86         if (len < sizeof(struct sockaddr_rxrpc))
  87                 return -EINVAL;
  88
  89         if (srx->srx_family != AF_RXRPC)
  90                 return -EAFNOSUPPORT;
  91
  92         if (srx->transport_type != SOCK_DGRAM)
  93                 return -ESOCKTNOSUPPORT;
  94
  95         len -= offsetof(struct sockaddr_rxrpc, transport);
  96         if (srx->transport_len < sizeof(sa_family_t) ||
  97             srx->transport_len > len)
  98                 return -EINVAL;
  99
 100         if (srx->transport.family != rx->proto)
 101                 return -EAFNOSUPPORT;
 102
 103         switch (srx->transport.family) {
 104         case AF_INET:
 105                 if (srx->transport_len < sizeof(struct sockaddr_in))
 106                         return -EINVAL;
 107                 _debug("INET: %x @ %pI4",
 108                        ntohs(srx->transport.sin.sin_port),
 109                        &srx->transport.sin.sin_addr);
 110                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
 111                 break;
 112
 113         case AF_INET6:
 114         default:
 115                 return -EAFNOSUPPORT;
 116         }
 117
 118         if (tail < len)
 119                 memset((void *)srx + tail, 0, len - tail);
 120         return 0;
 121 }
 122
 123 /*
 124  * bind a local address to an RxRPC socket
 125  */
 126 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 127 {
 128         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
 129         struct sock *sk = sock->sk;
 130         struct rxrpc_local *local;
 131         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
 132         int ret;
 133
 134         _enter("%p,%p,%d", rx, saddr, len);
 135
 136         ret = rxrpc_validate_address(rx, srx, len);
 137         if (ret < 0)
 138                 goto error;
 139
 140         lock_sock(&rx->sk);
 141
 142         if (rx->sk.sk_state != RXRPC_UNBOUND) {
 143                 ret = -EINVAL;
 144                 goto error_unlock;
 145         }
 146
 147         memcpy(&rx->srx, srx, sizeof(rx->srx));
 148
 149         local = rxrpc_lookup_local(&rx->srx);
 150         if (IS_ERR(local)) {
 151                 ret = PTR_ERR(local);
 152                 goto error_unlock;
 153         }
 154
 155         if (rx->srx.srx_service) {
 156                 write_lock_bh(&local->services_lock);
 157                 list_for_each_entry(prx, &local->services, listen_link) {
 158                         if (prx->srx.srx_service == rx->srx.srx_service)
 159                                 goto service_in_use;
 160                 }
 161
 162                 rx->local = local;
 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->local = local;
 169                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 170         }
 171
 172         release_sock(&rx->sk);
 173         _leave(" = 0");
 174         return 0;
 175
 176 service_in_use:
 177         write_unlock_bh(&local->services_lock);
 178         rxrpc_put_local(local);
 179         ret = -EADDRINUSE;
 180 error_unlock:
 181         release_sock(&rx->sk);
 182 error:
 183         _leave(" = %d", ret);
 184         return ret;
 185 }
 186
 187 /*
 188  * set the number of pending calls permitted on a listening socket
 189  */
 190 static int rxrpc_listen(struct socket *sock, int backlog)
 191 {
 192         struct sock *sk = sock->sk;
 193         struct rxrpc_sock *rx = rxrpc_sk(sk);
 194         unsigned int max;
 195         int ret;
 196
 197         _enter("%p,%d", rx, backlog);
 198
 199         lock_sock(&rx->sk);
 200
 201         switch (rx->sk.sk_state) {
 202         case RXRPC_UNBOUND:
 203                 ret = -EADDRNOTAVAIL;
 204                 break;
 205         case RXRPC_SERVER_BOUND:
 206                 ASSERT(rx->local != NULL);
 207                 max = READ_ONCE(rxrpc_max_backlog);
 208                 ret = -EINVAL;
 209                 if (backlog == INT_MAX)
 210                         backlog = max;
 211                 else if (backlog < 0 || backlog > max)
 212                         break;
 213                 sk->sk_max_ack_backlog = backlog;
 214                 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 215                 ret = 0;
 216                 break;
 217         default:
 218                 ret = -EBUSY;
 219                 break;
 220         }
 221
 222         release_sock(&rx->sk);
 223         _leave(" = %d", ret);
 224         return ret;
 225 }
 226
 227 /*
 228  * find a transport by address
 229  */
 230 struct rxrpc_transport *rxrpc_name_to_transport(struct rxrpc_sock *rx,
 231                                                 struct sockaddr *addr,
 232                                                 int addr_len, int flags,
 233                                                 gfp_t gfp)
 234 {
 235         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 236         struct rxrpc_transport *trans;
 237         struct rxrpc_peer *peer;
 238
 239         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 240
 241         ASSERT(rx->local != NULL);
 242
 243         if (rx->srx.transport_type != srx->transport_type)
 244                 return ERR_PTR(-ESOCKTNOSUPPORT);
 245         if (rx->srx.transport.family != srx->transport.family)
 246                 return ERR_PTR(-EAFNOSUPPORT);
 247
 248         /* find a remote transport endpoint from the local one */
 249         peer = rxrpc_lookup_peer(rx->local, srx, gfp);
 250         if (IS_ERR(peer))
 251                 return ERR_CAST(peer);
 252
 253         /* find a transport */
 254         trans = rxrpc_get_transport(rx->local, peer, gfp);
 255         rxrpc_put_peer(peer);
 256         _leave(" = %p", trans);
 257         return trans;
 258 }
 259
 260 /**
 261  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 262  * @sock: The socket on which to make the call
 263  * @srx: The address of the peer to contact
 264  * @key: The security context to use (defaults to socket setting)
 265  * @user_call_ID: The ID to use
 266  *
 267  * Allow a kernel service to begin a call on the nominated socket.  This just
 268  * sets up all the internal tracking structures and allocates connection and
 269  * call IDs as appropriate.  The call to be used is returned.
 270  *
 271  * The default socket destination address and security may be overridden by
 272  * supplying @srx and @key.
 273  */
 274 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 275                                            struct sockaddr_rxrpc *srx,
 276                                            struct key *key,
 277                                            unsigned long user_call_ID,
 278                                            gfp_t gfp)
 279 {
 280         struct rxrpc_conn_bundle *bundle;
 281         struct rxrpc_transport *trans;
 282         struct rxrpc_call *call;
 283         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 284
 285         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 286
 287         lock_sock(&rx->sk);
 288
 289         trans = rxrpc_name_to_transport(rx, (struct sockaddr *)srx,
 290                                         sizeof(*srx), 0, gfp);
 291         if (IS_ERR(trans)) {
 292                 call = ERR_CAST(trans);
 293                 trans = NULL;
 294                 goto out_notrans;
 295         }
 296
 297         if (!key)
 298                 key = rx->key;
 299         if (key && !key->payload.data[0])
 300                 key = NULL; /* a no-security key */
 301
 302         bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, gfp);
 303         if (IS_ERR(bundle)) {
 304                 call = ERR_CAST(bundle);
 305                 goto out;
 306         }
 307
 308         call = rxrpc_new_client_call(rx, trans, bundle, user_call_ID, gfp);
 309         rxrpc_put_bundle(trans, bundle);
 310 out:
 311         rxrpc_put_transport(trans);
 312 out_notrans:
 313         release_sock(&rx->sk);
 314         _leave(" = %p", call);
 315         return call;
 316 }
 317 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 318
 319 /**
 320  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 321  * @call: The call to end
 322  *
 323  * Allow a kernel service to end a call it was using.  The call must be
 324  * complete before this is called (the call should be aborted if necessary).
 325  */
 326 void rxrpc_kernel_end_call(struct rxrpc_call *call)
 327 {
 328         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 329         rxrpc_remove_user_ID(call->socket, call);
 330         rxrpc_put_call(call);
 331 }
 332 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 333
 334 /**
 335  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
 336  * @sock: The socket to intercept received messages on
 337  * @interceptor: The function to pass the messages to
 338  *
 339  * Allow a kernel service to intercept messages heading for the Rx queue on an
 340  * RxRPC socket.  They get passed to the specified function instead.
 341  * @interceptor should free the socket buffers it is given.  @interceptor is
 342  * called with the socket receive queue spinlock held and softirqs disabled -
 343  * this ensures that the messages will be delivered in the right order.
 344  */
 345 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
 346                                         rxrpc_interceptor_t interceptor)
 347 {
 348         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 349
 350         _enter("");
 351         rx->interceptor = interceptor;
 352 }
 353
 354 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
 355
 356 /*
 357  * connect an RxRPC socket
 358  * - this just targets it at a specific destination; no actual connection
 359  *   negotiation takes place
 360  */
 361 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 362                          int addr_len, int flags)
 363 {
 364         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 365         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 366         int ret;
 367
 368         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 369
 370         ret = rxrpc_validate_address(rx, srx, addr_len);
 371         if (ret < 0) {
 372                 _leave(" = %d [bad addr]", ret);
 373                 return ret;
 374         }
 375
 376         lock_sock(&rx->sk);
 377
 378         ret = -EISCONN;
 379         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 380                 goto error;
 381
 382         switch (rx->sk.sk_state) {
 383         case RXRPC_UNBOUND:
 384                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 385         case RXRPC_CLIENT_UNBOUND:
 386         case RXRPC_CLIENT_BOUND:
 387                 break;
 388         default:
 389                 ret = -EBUSY;
 390                 goto error;
 391         }
 392
 393         rx->connect_srx = *srx;
 394         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 395         ret = 0;
 396
 397 error:
 398         release_sock(&rx->sk);
 399         return ret;
 400 }
 401
 402 /*
 403  * send a message through an RxRPC socket
 404  * - in a client this does a number of things:
 405  *   - finds/sets up a connection for the security specified (if any)
 406  *   - initiates a call (ID in control data)
 407  *   - ends the request phase of a call (if MSG_MORE is not set)
 408  *   - sends a call data packet
 409  *   - may send an abort (abort code in control data)
 410  */
 411 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 412 {
 413         struct rxrpc_local *local;
 414         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 415         int ret;
 416
 417         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 418
 419         if (m->msg_flags & MSG_OOB)
 420                 return -EOPNOTSUPP;
 421
 422         if (m->msg_name) {
 423                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 424                 if (ret < 0) {
 425                         _leave(" = %d [bad addr]", ret);
 426                         return ret;
 427                 }
 428         }
 429
 430         lock_sock(&rx->sk);
 431
 432         switch (rx->sk.sk_state) {
 433         case RXRPC_UNBOUND:
 434                 local = rxrpc_lookup_local(&rx->srx);
 435                 if (IS_ERR(local)) {
 436                         ret = PTR_ERR(local);
 437                         goto error_unlock;
 438                 }
 439
 440                 rx->local = local;
 441                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 442                 /* Fall through */
 443
 444         case RXRPC_CLIENT_UNBOUND:
 445         case RXRPC_CLIENT_BOUND:
 446                 if (!m->msg_name &&
 447                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 448                         m->msg_name = &rx->connect_srx;
 449                         m->msg_namelen = sizeof(rx->connect_srx);
 450                 }
 451         case RXRPC_SERVER_BOUND:
 452         case RXRPC_SERVER_LISTENING:
 453                 ret = rxrpc_do_sendmsg(rx, m, len);
 454                 break;
 455         default:
 456                 ret = -EINVAL;
 457                 break;
 458         }
 459
 460 error_unlock:
 461         release_sock(&rx->sk);
 462         _leave(" = %d", ret);
 463         return ret;
 464 }
 465
 466 /*
 467  * set RxRPC socket options
 468  */
 469 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 470                             char __user *optval, unsigned int optlen)
 471 {
 472         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 473         unsigned int min_sec_level;
 474         int ret;
 475
 476         _enter(",%d,%d,,%d", level, optname, optlen);
 477
 478         lock_sock(&rx->sk);
 479         ret = -EOPNOTSUPP;
 480
 481         if (level == SOL_RXRPC) {
 482                 switch (optname) {
 483                 case RXRPC_EXCLUSIVE_CONNECTION:
 484                         ret = -EINVAL;
 485                         if (optlen != 0)
 486                                 goto error;
 487                         ret = -EISCONN;
 488                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 489                                 goto error;
 490                         set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
 491                         goto success;
 492
 493                 case RXRPC_SECURITY_KEY:
 494                         ret = -EINVAL;
 495                         if (rx->key)
 496                                 goto error;
 497                         ret = -EISCONN;
 498                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 499                                 goto error;
 500                         ret = rxrpc_request_key(rx, optval, optlen);
 501                         goto error;
 502
 503                 case RXRPC_SECURITY_KEYRING:
 504                         ret = -EINVAL;
 505                         if (rx->key)
 506                                 goto error;
 507                         ret = -EISCONN;
 508                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 509                                 goto error;
 510                         ret = rxrpc_server_keyring(rx, optval, optlen);
 511                         goto error;
 512
 513                 case RXRPC_MIN_SECURITY_LEVEL:
 514                         ret = -EINVAL;
 515                         if (optlen != sizeof(unsigned int))
 516                                 goto error;
 517                         ret = -EISCONN;
 518                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 519                                 goto error;
 520                         ret = get_user(min_sec_level,
 521                                        (unsigned int __user *) optval);
 522                         if (ret < 0)
 523                                 goto error;
 524                         ret = -EINVAL;
 525                         if (min_sec_level > RXRPC_SECURITY_MAX)
 526                                 goto error;
 527                         rx->min_sec_level = min_sec_level;
 528                         goto success;
 529
 530                 default:
 531                         break;
 532                 }
 533         }
 534
 535 success:
 536         ret = 0;
 537 error:
 538         release_sock(&rx->sk);
 539         return ret;
 540 }
 541
 542 /*
 543  * permit an RxRPC socket to be polled
 544  */
 545 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 546                                poll_table *wait)
 547 {
 548         unsigned int mask;
 549         struct sock *sk = sock->sk;
 550
 551         sock_poll_wait(file, sk_sleep(sk), wait);
 552         mask = 0;
 553
 554         /* the socket is readable if there are any messages waiting on the Rx
 555          * queue */
 556         if (!skb_queue_empty(&sk->sk_receive_queue))
 557                 mask |= POLLIN | POLLRDNORM;
 558
 559         /* the socket is writable if there is space to add new data to the
 560          * socket; there is no guarantee that any particular call in progress
 561          * on the socket may have space in the Tx ACK window */
 562         if (rxrpc_writable(sk))
 563                 mask |= POLLOUT | POLLWRNORM;
 564
 565         return mask;
 566 }
 567
 568 /*
 569  * create an RxRPC socket
 570  */
 571 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 572                         int kern)
 573 {
 574         struct rxrpc_sock *rx;
 575         struct sock *sk;
 576
 577         _enter("%p,%d", sock, protocol);
 578
 579         if (!net_eq(net, &init_net))
 580                 return -EAFNOSUPPORT;
 581
 582         /* we support transport protocol UDP/UDP6 only */
 583         if (protocol != PF_INET)
 584                 return -EPROTONOSUPPORT;
 585
 586         if (sock->type != SOCK_DGRAM)
 587                 return -ESOCKTNOSUPPORT;
 588
 589         sock->ops = &rxrpc_rpc_ops;
 590         sock->state = SS_UNCONNECTED;
 591
 592         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 593         if (!sk)
 594                 return -ENOMEM;
 595
 596         sock_init_data(sock, sk);
 597         sk->sk_state            = RXRPC_UNBOUND;
 598         sk->sk_write_space      = rxrpc_write_space;
 599         sk->sk_max_ack_backlog  = 0;
 600         sk->sk_destruct         = rxrpc_sock_destructor;
 601
 602         rx = rxrpc_sk(sk);
 603         rx->proto = protocol;
 604         rx->calls = RB_ROOT;
 605
 606         INIT_LIST_HEAD(&rx->listen_link);
 607         INIT_LIST_HEAD(&rx->secureq);
 608         INIT_LIST_HEAD(&rx->acceptq);
 609         rwlock_init(&rx->call_lock);
 610         memset(&rx->srx, 0, sizeof(rx->srx));
 611
 612         _leave(" = 0 [%p]", rx);
 613         return 0;
 614 }
 615
 616 /*
 617  * RxRPC socket destructor
 618  */
 619 static void rxrpc_sock_destructor(struct sock *sk)
 620 {
 621         _enter("%p", sk);
 622
 623         rxrpc_purge_queue(&sk->sk_receive_queue);
 624
 625         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 626         WARN_ON(!sk_unhashed(sk));
 627         WARN_ON(sk->sk_socket);
 628
 629         if (!sock_flag(sk, SOCK_DEAD)) {
 630                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 631                 return;
 632         }
 633 }
 634
 635 /*
 636  * release an RxRPC socket
 637  */
 638 static int rxrpc_release_sock(struct sock *sk)
 639 {
 640         struct rxrpc_sock *rx = rxrpc_sk(sk);
 641
 642         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 643
 644         /* declare the socket closed for business */
 645         sock_orphan(sk);
 646         sk->sk_shutdown = SHUTDOWN_MASK;
 647
 648         spin_lock_bh(&sk->sk_receive_queue.lock);
 649         sk->sk_state = RXRPC_CLOSE;
 650         spin_unlock_bh(&sk->sk_receive_queue.lock);
 651
 652         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 653
 654         if (!list_empty(&rx->listen_link)) {
 655                 write_lock_bh(&rx->local->services_lock);
 656                 list_del(&rx->listen_link);
 657                 write_unlock_bh(&rx->local->services_lock);
 658         }
 659
 660         /* try to flush out this socket */
 661         rxrpc_release_calls_on_socket(rx);
 662         flush_workqueue(rxrpc_workqueue);
 663         rxrpc_purge_queue(&sk->sk_receive_queue);
 664
 665         if (rx->conn) {
 666                 rxrpc_put_connection(rx->conn);
 667                 rx->conn = NULL;
 668         }
 669
 670         if (rx->local) {
 671                 rxrpc_put_local(rx->local);
 672                 rx->local = NULL;
 673         }
 674
 675         key_put(rx->key);
 676         rx->key = NULL;
 677         key_put(rx->securities);
 678         rx->securities = NULL;
 679         sock_put(sk);
 680
 681         _leave(" = 0");
 682         return 0;
 683 }
 684
 685 /*
 686  * release an RxRPC BSD socket on close() or equivalent
 687  */
 688 static int rxrpc_release(struct socket *sock)
 689 {
 690         struct sock *sk = sock->sk;
 691
 692         _enter("%p{%p}", sock, sk);
 693
 694         if (!sk)
 695                 return 0;
 696
 697         sock->sk = NULL;
 698
 699         return rxrpc_release_sock(sk);
 700 }
 701
 702 /*
 703  * RxRPC network protocol
 704  */
 705 static const struct proto_ops rxrpc_rpc_ops = {
 706         .family         = PF_RXRPC,
 707         .owner          = THIS_MODULE,
 708         .release        = rxrpc_release,
 709         .bind           = rxrpc_bind,
 710         .connect        = rxrpc_connect,
 711         .socketpair     = sock_no_socketpair,
 712         .accept         = sock_no_accept,
 713         .getname        = sock_no_getname,
 714         .poll           = rxrpc_poll,
 715         .ioctl          = sock_no_ioctl,
 716         .listen         = rxrpc_listen,
 717         .shutdown       = sock_no_shutdown,
 718         .setsockopt     = rxrpc_setsockopt,
 719         .getsockopt     = sock_no_getsockopt,
 720         .sendmsg        = rxrpc_sendmsg,
 721         .recvmsg        = rxrpc_recvmsg,
 722         .mmap           = sock_no_mmap,
 723         .sendpage       = sock_no_sendpage,
 724 };
 725
 726 static struct proto rxrpc_proto = {
 727         .name           = "RXRPC",
 728         .owner          = THIS_MODULE,
 729         .obj_size       = sizeof(struct rxrpc_sock),
 730         .max_header     = sizeof(struct rxrpc_wire_header),
 731 };
 732
 733 static const struct net_proto_family rxrpc_family_ops = {
 734         .family = PF_RXRPC,
 735         .create = rxrpc_create,
 736         .owner  = THIS_MODULE,
 737 };
 738
 739 /*
 740  * initialise and register the RxRPC protocol
 741  */
 742 static int __init af_rxrpc_init(void)
 743 {
 744         int ret = -1;
 745
 746         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 747
 748         rxrpc_epoch = get_seconds();
 749
 750         ret = -ENOMEM;
 751         rxrpc_call_jar = kmem_cache_create(
 752                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 753                 SLAB_HWCACHE_ALIGN, NULL);
 754         if (!rxrpc_call_jar) {
 755                 pr_notice("Failed to allocate call jar\n");
 756                 goto error_call_jar;
 757         }
 758
 759         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 760         if (!rxrpc_workqueue) {
 761                 pr_notice("Failed to allocate work queue\n");
 762                 goto error_work_queue;
 763         }
 764
 765         ret = rxrpc_init_security();
 766         if (ret < 0) {
 767                 pr_crit("Cannot initialise security\n");
 768                 goto error_security;
 769         }
 770
 771         ret = proto_register(&rxrpc_proto, 1);
 772         if (ret < 0) {
 773                 pr_crit("Cannot register protocol\n");
 774                 goto error_proto;
 775         }
 776
 777         ret = sock_register(&rxrpc_family_ops);
 778         if (ret < 0) {
 779                 pr_crit("Cannot register socket family\n");
 780                 goto error_sock;
 781         }
 782
 783         ret = register_key_type(&key_type_rxrpc);
 784         if (ret < 0) {
 785                 pr_crit("Cannot register client key type\n");
 786                 goto error_key_type;
 787         }
 788
 789         ret = register_key_type(&key_type_rxrpc_s);
 790         if (ret < 0) {
 791                 pr_crit("Cannot register server key type\n");
 792                 goto error_key_type_s;
 793         }
 794
 795         ret = rxrpc_sysctl_init();
 796         if (ret < 0) {
 797                 pr_crit("Cannot register sysctls\n");
 798                 goto error_sysctls;
 799         }
 800
 801 #ifdef CONFIG_PROC_FS
 802         proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops);
 803         proc_create("rxrpc_conns", 0, init_net.proc_net,
 804                     &rxrpc_connection_seq_fops);
 805 #endif
 806         return 0;
 807
 808 error_sysctls:
 809         unregister_key_type(&key_type_rxrpc_s);
 810 error_key_type_s:
 811         unregister_key_type(&key_type_rxrpc);
 812 error_key_type:
 813         sock_unregister(PF_RXRPC);
 814 error_sock:
 815         proto_unregister(&rxrpc_proto);
 816 error_proto:
 817         destroy_workqueue(rxrpc_workqueue);
 818 error_security:
 819         rxrpc_exit_security();
 820 error_work_queue:
 821         kmem_cache_destroy(rxrpc_call_jar);
 822 error_call_jar:
 823         return ret;
 824 }
 825
 826 /*
 827  * unregister the RxRPC protocol
 828  */
 829 static void __exit af_rxrpc_exit(void)
 830 {
 831         _enter("");
 832         rxrpc_sysctl_exit();
 833         unregister_key_type(&key_type_rxrpc_s);
 834         unregister_key_type(&key_type_rxrpc);
 835         sock_unregister(PF_RXRPC);
 836         proto_unregister(&rxrpc_proto);
 837         rxrpc_destroy_all_calls();
 838         rxrpc_destroy_all_connections();
 839         rxrpc_destroy_all_transports();
 840
 841         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 842
 843         /* We need to flush the scheduled work twice because the local endpoint
 844          * records involve a work item in their destruction as they can only be
 845          * destroyed from process context.  However, a connection may have a
 846          * work item outstanding - and this will pin the local endpoint record
 847          * until the connection goes away.
 848          *
 849          * Peers don't pin locals and calls pin sockets - which prevents the
 850          * module from being unloaded - so we should only need two flushes.
 851          */
 852         _debug("flush scheduled work");
 853         flush_workqueue(rxrpc_workqueue);
 854         _debug("flush scheduled work 2");
 855         flush_workqueue(rxrpc_workqueue);
 856         _debug("synchronise RCU");
 857         rcu_barrier();
 858         _debug("destroy locals");
 859         rxrpc_destroy_all_locals();
 860
 861         remove_proc_entry("rxrpc_conns", init_net.proc_net);
 862         remove_proc_entry("rxrpc_calls", init_net.proc_net);
 863         destroy_workqueue(rxrpc_workqueue);
 864         rxrpc_exit_security();
 865         kmem_cache_destroy(rxrpc_call_jar);
 866         _leave("");
 867 }
 868
 869 module_init(af_rxrpc_init);
 870 module_exit(af_rxrpc_exit);