net/rxrpc/af_rxrpc.c

   1 /* AF_RXRPC implementation
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/net.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/random.h>
  20 #include <linux/poll.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/key-type.h>
  23 #include <net/net_namespace.h>
  24 #include <net/sock.h>
  25 #include <net/af_rxrpc.h>
  26 #define CREATE_TRACE_POINTS
  27 #include "ar-internal.h"
  28
  29 MODULE_DESCRIPTION("RxRPC network protocol");
  30 MODULE_AUTHOR("Red Hat, Inc.");
  31 MODULE_LICENSE("GPL");
  32 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  33
  34 unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  35 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
  36 MODULE_PARM_DESC(debug, "RxRPC debugging mask");
  37
  38 static struct proto rxrpc_proto;
  39 static const struct proto_ops rxrpc_rpc_ops;
  40
  41 /* current debugging ID */
  42 atomic_t rxrpc_debug_id;
  43
  44 /* count of skbs currently in use */
  45 atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs;
  46
  47 struct workqueue_struct *rxrpc_workqueue;
  48
  49 static void rxrpc_sock_destructor(struct sock *);
  50
  51 /*
  52  * see if an RxRPC socket is currently writable
  53  */
  54 static inline int rxrpc_writable(struct sock *sk)
  55 {
  56         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
  57 }
  58
  59 /*
  60  * wait for write bufferage to become available
  61  */
  62 static void rxrpc_write_space(struct sock *sk)
  63 {
  64         _enter("%p", sk);
  65         rcu_read_lock();
  66         if (rxrpc_writable(sk)) {
  67                 struct socket_wq *wq = rcu_dereference(sk->sk_wq);
  68
  69                 if (skwq_has_sleeper(wq))
  70                         wake_up_interruptible(&wq->wait);
  71                 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
  72         }
  73         rcu_read_unlock();
  74 }
  75
  76 /*
  77  * validate an RxRPC address
  78  */
  79 static int rxrpc_validate_address(struct rxrpc_sock *rx,
  80                                   struct sockaddr_rxrpc *srx,
  81                                   int len)
  82 {
  83         unsigned int tail;
  84
  85         if (len < sizeof(struct sockaddr_rxrpc))
  86                 return -EINVAL;
  87
  88         if (srx->srx_family != AF_RXRPC)
  89                 return -EAFNOSUPPORT;
  90
  91         if (srx->transport_type != SOCK_DGRAM)
  92                 return -ESOCKTNOSUPPORT;
  93
  94         len -= offsetof(struct sockaddr_rxrpc, transport);
  95         if (srx->transport_len < sizeof(sa_family_t) ||
  96             srx->transport_len > len)
  97                 return -EINVAL;
  98
  99         if (srx->transport.family != rx->family)
 100                 return -EAFNOSUPPORT;
 101
 102         switch (srx->transport.family) {
 103         case AF_INET:
 104                 if (srx->transport_len < sizeof(struct sockaddr_in))
 105                         return -EINVAL;
 106                 tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad);
 107                 break;
 108
 109 #ifdef CONFIG_AF_RXRPC_IPV6
 110         case AF_INET6:
 111                 if (srx->transport_len < sizeof(struct sockaddr_in6))
 112                         return -EINVAL;
 113                 tail = offsetof(struct sockaddr_rxrpc, transport) +
 114                         sizeof(struct sockaddr_in6);
 115                 break;
 116 #endif
 117
 118         default:
 119                 return -EAFNOSUPPORT;
 120         }
 121
 122         if (tail < len)
 123                 memset((void *)srx + tail, 0, len - tail);
 124         _debug("INET: %pISp", &srx->transport);
 125         return 0;
 126 }
 127
 128 /*
 129  * bind a local address to an RxRPC socket
 130  */
 131 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 132 {
 133         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr;
 134         struct sock *sk = sock->sk;
 135         struct rxrpc_local *local;
 136         struct rxrpc_sock *rx = rxrpc_sk(sk);
 137         u16 service_id = srx->srx_service;
 138         int ret;
 139
 140         _enter("%p,%p,%d", rx, saddr, len);
 141
 142         ret = rxrpc_validate_address(rx, srx, len);
 143         if (ret < 0)
 144                 goto error;
 145
 146         lock_sock(&rx->sk);
 147
 148         if (rx->sk.sk_state != RXRPC_UNBOUND) {
 149                 ret = -EINVAL;
 150                 goto error_unlock;
 151         }
 152
 153         memcpy(&rx->srx, srx, sizeof(rx->srx));
 154
 155         local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
 156         if (IS_ERR(local)) {
 157                 ret = PTR_ERR(local);
 158                 goto error_unlock;
 159         }
 160
 161         if (service_id) {
 162                 write_lock(&local->services_lock);
 163                 if (rcu_access_pointer(local->service))
 164                         goto service_in_use;
 165                 rx->local = local;
 166                 rcu_assign_pointer(local->service, rx);
 167                 write_unlock(&local->services_lock);
 168
 169                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
 170         } else {
 171                 rx->local = local;
 172                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 173         }
 174
 175         release_sock(&rx->sk);
 176         _leave(" = 0");
 177         return 0;
 178
 179 service_in_use:
 180         write_unlock(&local->services_lock);
 181         rxrpc_put_local(local);
 182         ret = -EADDRINUSE;
 183 error_unlock:
 184         release_sock(&rx->sk);
 185 error:
 186         _leave(" = %d", ret);
 187         return ret;
 188 }
 189
 190 /*
 191  * set the number of pending calls permitted on a listening socket
 192  */
 193 static int rxrpc_listen(struct socket *sock, int backlog)
 194 {
 195         struct sock *sk = sock->sk;
 196         struct rxrpc_sock *rx = rxrpc_sk(sk);
 197         unsigned int max, old;
 198         int ret;
 199
 200         _enter("%p,%d", rx, backlog);
 201
 202         lock_sock(&rx->sk);
 203
 204         switch (rx->sk.sk_state) {
 205         case RXRPC_UNBOUND:
 206                 ret = -EADDRNOTAVAIL;
 207                 break;
 208         case RXRPC_SERVER_BOUND:
 209                 ASSERT(rx->local != NULL);
 210                 max = READ_ONCE(rxrpc_max_backlog);
 211                 ret = -EINVAL;
 212                 if (backlog == INT_MAX)
 213                         backlog = max;
 214                 else if (backlog < 0 || backlog > max)
 215                         break;
 216                 old = sk->sk_max_ack_backlog;
 217                 sk->sk_max_ack_backlog = backlog;
 218                 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
 219                 if (ret == 0)
 220                         rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 221                 else
 222                         sk->sk_max_ack_backlog = old;
 223                 break;
 224         case RXRPC_SERVER_LISTENING:
 225                 if (backlog == 0) {
 226                         rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
 227                         sk->sk_max_ack_backlog = 0;
 228                         rxrpc_discard_prealloc(rx);
 229                         ret = 0;
 230                         break;
 231                 }
 232         default:
 233                 ret = -EBUSY;
 234                 break;
 235         }
 236
 237         release_sock(&rx->sk);
 238         _leave(" = %d", ret);
 239         return ret;
 240 }
 241
 242 /**
 243  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 244  * @sock: The socket on which to make the call
 245  * @srx: The address of the peer to contact
 246  * @key: The security context to use (defaults to socket setting)
 247  * @user_call_ID: The ID to use
 248  * @gfp: The allocation constraints
 249  * @notify_rx: Where to send notifications instead of socket queue
 250  *
 251  * Allow a kernel service to begin a call on the nominated socket.  This just
 252  * sets up all the internal tracking structures and allocates connection and
 253  * call IDs as appropriate.  The call to be used is returned.
 254  *
 255  * The default socket destination address and security may be overridden by
 256  * supplying @srx and @key.
 257  */
 258 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 259                                            struct sockaddr_rxrpc *srx,
 260                                            struct key *key,
 261                                            unsigned long user_call_ID,
 262                                            gfp_t gfp,
 263                                            rxrpc_notify_rx_t notify_rx)
 264 {
 265         struct rxrpc_conn_parameters cp;
 266         struct rxrpc_call *call;
 267         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 268         int ret;
 269
 270         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 271
 272         ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
 273         if (ret < 0)
 274                 return ERR_PTR(ret);
 275
 276         lock_sock(&rx->sk);
 277
 278         if (!key)
 279                 key = rx->key;
 280         if (key && !key->payload.data[0])
 281                 key = NULL; /* a no-security key */
 282
 283         memset(&cp, 0, sizeof(cp));
 284         cp.local                = rx->local;
 285         cp.key                  = key;
 286         cp.security_level       = 0;
 287         cp.exclusive            = false;
 288         cp.service_id           = srx->srx_service;
 289         call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
 290         /* The socket has been unlocked. */
 291         if (!IS_ERR(call))
 292                 call->notify_rx = notify_rx;
 293
 294         mutex_unlock(&call->user_mutex);
 295         _leave(" = %p", call);
 296         return call;
 297 }
 298 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 299
 300 /**
 301  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 302  * @sock: The socket the call is on
 303  * @call: The call to end
 304  *
 305  * Allow a kernel service to end a call it was using.  The call must be
 306  * complete before this is called (the call should be aborted if necessary).
 307  */
 308 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
 309 {
 310         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 311
 312         mutex_lock(&call->user_mutex);
 313         rxrpc_release_call(rxrpc_sk(sock->sk), call);
 314         mutex_unlock(&call->user_mutex);
 315         rxrpc_put_call(call, rxrpc_call_put_kernel);
 316 }
 317 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 318
 319 /**
 320  * rxrpc_kernel_new_call_notification - Get notifications of new calls
 321  * @sock: The socket to intercept received messages on
 322  * @notify_new_call: Function to be called when new calls appear
 323  * @discard_new_call: Function to discard preallocated calls
 324  *
 325  * Allow a kernel service to be given notifications about new calls.
 326  */
 327 void rxrpc_kernel_new_call_notification(
 328         struct socket *sock,
 329         rxrpc_notify_new_call_t notify_new_call,
 330         rxrpc_discard_new_call_t discard_new_call)
 331 {
 332         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 333
 334         rx->notify_new_call = notify_new_call;
 335         rx->discard_new_call = discard_new_call;
 336 }
 337 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 338
 339 /*
 340  * connect an RxRPC socket
 341  * - this just targets it at a specific destination; no actual connection
 342  *   negotiation takes place
 343  */
 344 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 345                          int addr_len, int flags)
 346 {
 347         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 348         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 349         int ret;
 350
 351         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 352
 353         ret = rxrpc_validate_address(rx, srx, addr_len);
 354         if (ret < 0) {
 355                 _leave(" = %d [bad addr]", ret);
 356                 return ret;
 357         }
 358
 359         lock_sock(&rx->sk);
 360
 361         ret = -EISCONN;
 362         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 363                 goto error;
 364
 365         switch (rx->sk.sk_state) {
 366         case RXRPC_UNBOUND:
 367                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 368         case RXRPC_CLIENT_UNBOUND:
 369         case RXRPC_CLIENT_BOUND:
 370                 break;
 371         default:
 372                 ret = -EBUSY;
 373                 goto error;
 374         }
 375
 376         rx->connect_srx = *srx;
 377         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 378         ret = 0;
 379
 380 error:
 381         release_sock(&rx->sk);
 382         return ret;
 383 }
 384
 385 /*
 386  * send a message through an RxRPC socket
 387  * - in a client this does a number of things:
 388  *   - finds/sets up a connection for the security specified (if any)
 389  *   - initiates a call (ID in control data)
 390  *   - ends the request phase of a call (if MSG_MORE is not set)
 391  *   - sends a call data packet
 392  *   - may send an abort (abort code in control data)
 393  */
 394 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 395 {
 396         struct rxrpc_local *local;
 397         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 398         int ret;
 399
 400         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 401
 402         if (m->msg_flags & MSG_OOB)
 403                 return -EOPNOTSUPP;
 404
 405         if (m->msg_name) {
 406                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 407                 if (ret < 0) {
 408                         _leave(" = %d [bad addr]", ret);
 409                         return ret;
 410                 }
 411         }
 412
 413         lock_sock(&rx->sk);
 414
 415         switch (rx->sk.sk_state) {
 416         case RXRPC_UNBOUND:
 417                 rx->srx.srx_family = AF_RXRPC;
 418                 rx->srx.srx_service = 0;
 419                 rx->srx.transport_type = SOCK_DGRAM;
 420                 rx->srx.transport.family = rx->family;
 421                 switch (rx->family) {
 422                 case AF_INET:
 423                         rx->srx.transport_len = sizeof(struct sockaddr_in);
 424                         break;
 425 #ifdef CONFIG_AF_RXRPC_IPV6
 426                 case AF_INET6:
 427                         rx->srx.transport_len = sizeof(struct sockaddr_in6);
 428                         break;
 429 #endif
 430                 default:
 431                         ret = -EAFNOSUPPORT;
 432                         goto error_unlock;
 433                 }
 434                 local = rxrpc_lookup_local(sock_net(sock->sk), &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                 /* The socket has been unlocked */
 455                 goto out;
 456         default:
 457                 ret = -EINVAL;
 458                 goto error_unlock;
 459         }
 460
 461 error_unlock:
 462         release_sock(&rx->sk);
 463 out:
 464         _leave(" = %d", ret);
 465         return ret;
 466 }
 467
 468 /*
 469  * set RxRPC socket options
 470  */
 471 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 472                             char __user *optval, unsigned int optlen)
 473 {
 474         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 475         unsigned int min_sec_level;
 476         int ret;
 477
 478         _enter(",%d,%d,,%d", level, optname, optlen);
 479
 480         lock_sock(&rx->sk);
 481         ret = -EOPNOTSUPP;
 482
 483         if (level == SOL_RXRPC) {
 484                 switch (optname) {
 485                 case RXRPC_EXCLUSIVE_CONNECTION:
 486                         ret = -EINVAL;
 487                         if (optlen != 0)
 488                                 goto error;
 489                         ret = -EISCONN;
 490                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 491                                 goto error;
 492                         rx->exclusive = true;
 493                         goto success;
 494
 495                 case RXRPC_SECURITY_KEY:
 496                         ret = -EINVAL;
 497                         if (rx->key)
 498                                 goto error;
 499                         ret = -EISCONN;
 500                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 501                                 goto error;
 502                         ret = rxrpc_request_key(rx, optval, optlen);
 503                         goto error;
 504
 505                 case RXRPC_SECURITY_KEYRING:
 506                         ret = -EINVAL;
 507                         if (rx->key)
 508                                 goto error;
 509                         ret = -EISCONN;
 510                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 511                                 goto error;
 512                         ret = rxrpc_server_keyring(rx, optval, optlen);
 513                         goto error;
 514
 515                 case RXRPC_MIN_SECURITY_LEVEL:
 516                         ret = -EINVAL;
 517                         if (optlen != sizeof(unsigned int))
 518                                 goto error;
 519                         ret = -EISCONN;
 520                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 521                                 goto error;
 522                         ret = get_user(min_sec_level,
 523                                        (unsigned int __user *) optval);
 524                         if (ret < 0)
 525                                 goto error;
 526                         ret = -EINVAL;
 527                         if (min_sec_level > RXRPC_SECURITY_MAX)
 528                                 goto error;
 529                         rx->min_sec_level = min_sec_level;
 530                         goto success;
 531
 532                 default:
 533                         break;
 534                 }
 535         }
 536
 537 success:
 538         ret = 0;
 539 error:
 540         release_sock(&rx->sk);
 541         return ret;
 542 }
 543
 544 /*
 545  * permit an RxRPC socket to be polled
 546  */
 547 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 548                                poll_table *wait)
 549 {
 550         struct sock *sk = sock->sk;
 551         struct rxrpc_sock *rx = rxrpc_sk(sk);
 552         unsigned int mask;
 553
 554         sock_poll_wait(file, sk_sleep(sk), wait);
 555         mask = 0;
 556
 557         /* the socket is readable if there are any messages waiting on the Rx
 558          * queue */
 559         if (!list_empty(&rx->recvmsg_q))
 560                 mask |= POLLIN | POLLRDNORM;
 561
 562         /* the socket is writable if there is space to add new data to the
 563          * socket; there is no guarantee that any particular call in progress
 564          * on the socket may have space in the Tx ACK window */
 565         if (rxrpc_writable(sk))
 566                 mask |= POLLOUT | POLLWRNORM;
 567
 568         return mask;
 569 }
 570
 571 /*
 572  * create an RxRPC socket
 573  */
 574 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 575                         int kern)
 576 {
 577         struct rxrpc_sock *rx;
 578         struct sock *sk;
 579
 580         _enter("%p,%d", sock, protocol);
 581
 582         /* we support transport protocol UDP/UDP6 only */
 583         if (protocol != PF_INET &&
 584             IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
 585                 return -EPROTONOSUPPORT;
 586
 587         if (sock->type != SOCK_DGRAM)
 588                 return -ESOCKTNOSUPPORT;
 589
 590         sock->ops = &rxrpc_rpc_ops;
 591         sock->state = SS_UNCONNECTED;
 592
 593         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 594         if (!sk)
 595                 return -ENOMEM;
 596
 597         sock_init_data(sock, sk);
 598         sock_set_flag(sk, SOCK_RCU_FREE);
 599         sk->sk_state            = RXRPC_UNBOUND;
 600         sk->sk_write_space      = rxrpc_write_space;
 601         sk->sk_max_ack_backlog  = 0;
 602         sk->sk_destruct         = rxrpc_sock_destructor;
 603
 604         rx = rxrpc_sk(sk);
 605         rx->family = protocol;
 606         rx->calls = RB_ROOT;
 607
 608         spin_lock_init(&rx->incoming_lock);
 609         INIT_LIST_HEAD(&rx->sock_calls);
 610         INIT_LIST_HEAD(&rx->to_be_accepted);
 611         INIT_LIST_HEAD(&rx->recvmsg_q);
 612         rwlock_init(&rx->recvmsg_lock);
 613         rwlock_init(&rx->call_lock);
 614         memset(&rx->srx, 0, sizeof(rx->srx));
 615
 616         _leave(" = 0 [%p]", rx);
 617         return 0;
 618 }
 619
 620 /*
 621  * Kill all the calls on a socket and shut it down.
 622  */
 623 static int rxrpc_shutdown(struct socket *sock, int flags)
 624 {
 625         struct sock *sk = sock->sk;
 626         struct rxrpc_sock *rx = rxrpc_sk(sk);
 627         int ret = 0;
 628
 629         _enter("%p,%d", sk, flags);
 630
 631         if (flags != SHUT_RDWR)
 632                 return -EOPNOTSUPP;
 633         if (sk->sk_state == RXRPC_CLOSE)
 634                 return -ESHUTDOWN;
 635
 636         lock_sock(sk);
 637
 638         spin_lock_bh(&sk->sk_receive_queue.lock);
 639         if (sk->sk_state < RXRPC_CLOSE) {
 640                 sk->sk_state = RXRPC_CLOSE;
 641                 sk->sk_shutdown = SHUTDOWN_MASK;
 642         } else {
 643                 ret = -ESHUTDOWN;
 644         }
 645         spin_unlock_bh(&sk->sk_receive_queue.lock);
 646
 647         rxrpc_discard_prealloc(rx);
 648
 649         release_sock(sk);
 650         return ret;
 651 }
 652
 653 /*
 654  * RxRPC socket destructor
 655  */
 656 static void rxrpc_sock_destructor(struct sock *sk)
 657 {
 658         _enter("%p", sk);
 659
 660         rxrpc_purge_queue(&sk->sk_receive_queue);
 661
 662         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 663         WARN_ON(!sk_unhashed(sk));
 664         WARN_ON(sk->sk_socket);
 665
 666         if (!sock_flag(sk, SOCK_DEAD)) {
 667                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 668                 return;
 669         }
 670 }
 671
 672 /*
 673  * release an RxRPC socket
 674  */
 675 static int rxrpc_release_sock(struct sock *sk)
 676 {
 677         struct rxrpc_sock *rx = rxrpc_sk(sk);
 678
 679         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 680
 681         /* declare the socket closed for business */
 682         sock_orphan(sk);
 683         sk->sk_shutdown = SHUTDOWN_MASK;
 684
 685         spin_lock_bh(&sk->sk_receive_queue.lock);
 686         sk->sk_state = RXRPC_CLOSE;
 687         spin_unlock_bh(&sk->sk_receive_queue.lock);
 688
 689         if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
 690                 write_lock(&rx->local->services_lock);
 691                 rcu_assign_pointer(rx->local->service, NULL);
 692                 write_unlock(&rx->local->services_lock);
 693         }
 694
 695         /* try to flush out this socket */
 696         rxrpc_discard_prealloc(rx);
 697         rxrpc_release_calls_on_socket(rx);
 698         flush_workqueue(rxrpc_workqueue);
 699         rxrpc_purge_queue(&sk->sk_receive_queue);
 700
 701         rxrpc_put_local(rx->local);
 702         rx->local = NULL;
 703         key_put(rx->key);
 704         rx->key = NULL;
 705         key_put(rx->securities);
 706         rx->securities = NULL;
 707         sock_put(sk);
 708
 709         _leave(" = 0");
 710         return 0;
 711 }
 712
 713 /*
 714  * release an RxRPC BSD socket on close() or equivalent
 715  */
 716 static int rxrpc_release(struct socket *sock)
 717 {
 718         struct sock *sk = sock->sk;
 719
 720         _enter("%p{%p}", sock, sk);
 721
 722         if (!sk)
 723                 return 0;
 724
 725         sock->sk = NULL;
 726
 727         return rxrpc_release_sock(sk);
 728 }
 729
 730 /*
 731  * RxRPC network protocol
 732  */
 733 static const struct proto_ops rxrpc_rpc_ops = {
 734         .family         = PF_RXRPC,
 735         .owner          = THIS_MODULE,
 736         .release        = rxrpc_release,
 737         .bind           = rxrpc_bind,
 738         .connect        = rxrpc_connect,
 739         .socketpair     = sock_no_socketpair,
 740         .accept         = sock_no_accept,
 741         .getname        = sock_no_getname,
 742         .poll           = rxrpc_poll,
 743         .ioctl          = sock_no_ioctl,
 744         .listen         = rxrpc_listen,
 745         .shutdown       = rxrpc_shutdown,
 746         .setsockopt     = rxrpc_setsockopt,
 747         .getsockopt     = sock_no_getsockopt,
 748         .sendmsg        = rxrpc_sendmsg,
 749         .recvmsg        = rxrpc_recvmsg,
 750         .mmap           = sock_no_mmap,
 751         .sendpage       = sock_no_sendpage,
 752 };
 753
 754 static struct proto rxrpc_proto = {
 755         .name           = "RXRPC",
 756         .owner          = THIS_MODULE,
 757         .obj_size       = sizeof(struct rxrpc_sock),
 758         .max_header     = sizeof(struct rxrpc_wire_header),
 759 };
 760
 761 static const struct net_proto_family rxrpc_family_ops = {
 762         .family = PF_RXRPC,
 763         .create = rxrpc_create,
 764         .owner  = THIS_MODULE,
 765 };
 766
 767 /*
 768  * initialise and register the RxRPC protocol
 769  */
 770 static int __init af_rxrpc_init(void)
 771 {
 772         int ret = -1;
 773         unsigned int tmp;
 774
 775         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 776
 777         get_random_bytes(&tmp, sizeof(tmp));
 778         tmp &= 0x3fffffff;
 779         if (tmp == 0)
 780                 tmp = 1;
 781         idr_set_cursor(&rxrpc_client_conn_ids, tmp);
 782
 783         ret = -ENOMEM;
 784         rxrpc_call_jar = kmem_cache_create(
 785                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 786                 SLAB_HWCACHE_ALIGN, NULL);
 787         if (!rxrpc_call_jar) {
 788                 pr_notice("Failed to allocate call jar\n");
 789                 goto error_call_jar;
 790         }
 791
 792         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 793         if (!rxrpc_workqueue) {
 794                 pr_notice("Failed to allocate work queue\n");
 795                 goto error_work_queue;
 796         }
 797
 798         ret = rxrpc_init_security();
 799         if (ret < 0) {
 800                 pr_crit("Cannot initialise security\n");
 801                 goto error_security;
 802         }
 803
 804         ret = register_pernet_subsys(&rxrpc_net_ops);
 805         if (ret)
 806                 goto error_pernet;
 807
 808         ret = proto_register(&rxrpc_proto, 1);
 809         if (ret < 0) {
 810                 pr_crit("Cannot register protocol\n");
 811                 goto error_proto;
 812         }
 813
 814         ret = sock_register(&rxrpc_family_ops);
 815         if (ret < 0) {
 816                 pr_crit("Cannot register socket family\n");
 817                 goto error_sock;
 818         }
 819
 820         ret = register_key_type(&key_type_rxrpc);
 821         if (ret < 0) {
 822                 pr_crit("Cannot register client key type\n");
 823                 goto error_key_type;
 824         }
 825
 826         ret = register_key_type(&key_type_rxrpc_s);
 827         if (ret < 0) {
 828                 pr_crit("Cannot register server key type\n");
 829                 goto error_key_type_s;
 830         }
 831
 832         ret = rxrpc_sysctl_init();
 833         if (ret < 0) {
 834                 pr_crit("Cannot register sysctls\n");
 835                 goto error_sysctls;
 836         }
 837
 838         return 0;
 839
 840 error_sysctls:
 841         unregister_key_type(&key_type_rxrpc_s);
 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         unregister_pernet_subsys(&rxrpc_net_ops);
 850 error_pernet:
 851         rxrpc_exit_security();
 852 error_security:
 853         destroy_workqueue(rxrpc_workqueue);
 854 error_work_queue:
 855         kmem_cache_destroy(rxrpc_call_jar);
 856 error_call_jar:
 857         return ret;
 858 }
 859
 860 /*
 861  * unregister the RxRPC protocol
 862  */
 863 static void __exit af_rxrpc_exit(void)
 864 {
 865         _enter("");
 866         rxrpc_sysctl_exit();
 867         unregister_key_type(&key_type_rxrpc_s);
 868         unregister_key_type(&key_type_rxrpc);
 869         sock_unregister(PF_RXRPC);
 870         proto_unregister(&rxrpc_proto);
 871         unregister_pernet_subsys(&rxrpc_net_ops);
 872         ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
 873         ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
 874
 875         /* Make sure the local and peer records pinned by any dying connections
 876          * are released.
 877          */
 878         rcu_barrier();
 879         rxrpc_destroy_client_conn_ids();
 880
 881         destroy_workqueue(rxrpc_workqueue);
 882         rxrpc_exit_security();
 883         kmem_cache_destroy(rxrpc_call_jar);
 884         _leave("");
 885 }
 886
 887 module_init(af_rxrpc_init);
 888 module_exit(af_rxrpc_exit);