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 rxrpc_local *local;
 135         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 136         u16 service_id = srx->srx_service;
 137         int ret;
 138
 139         _enter("%p,%p,%d", rx, saddr, len);
 140
 141         ret = rxrpc_validate_address(rx, srx, len);
 142         if (ret < 0)
 143                 goto error;
 144
 145         lock_sock(&rx->sk);
 146
 147         switch (rx->sk.sk_state) {
 148         case RXRPC_UNBOUND:
 149                 rx->srx = *srx;
 150                 local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx);
 151                 if (IS_ERR(local)) {
 152                         ret = PTR_ERR(local);
 153                         goto error_unlock;
 154                 }
 155
 156                 if (service_id) {
 157                         write_lock(&local->services_lock);
 158                         if (rcu_access_pointer(local->service))
 159                                 goto service_in_use;
 160                         rx->local = local;
 161                         rcu_assign_pointer(local->service, rx);
 162                         write_unlock(&local->services_lock);
 163
 164                         rx->sk.sk_state = RXRPC_SERVER_BOUND;
 165                 } else {
 166                         rx->local = local;
 167                         rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 168                 }
 169                 break;
 170
 171         case RXRPC_SERVER_BOUND:
 172                 ret = -EINVAL;
 173                 if (service_id == 0)
 174                         goto error_unlock;
 175                 ret = -EADDRINUSE;
 176                 if (service_id == rx->srx.srx_service)
 177                         goto error_unlock;
 178                 ret = -EINVAL;
 179                 srx->srx_service = rx->srx.srx_service;
 180                 if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0)
 181                         goto error_unlock;
 182                 rx->second_service = service_id;
 183                 rx->sk.sk_state = RXRPC_SERVER_BOUND2;
 184                 break;
 185
 186         default:
 187                 ret = -EINVAL;
 188                 goto error_unlock;
 189         }
 190
 191         release_sock(&rx->sk);
 192         _leave(" = 0");
 193         return 0;
 194
 195 service_in_use:
 196         write_unlock(&local->services_lock);
 197         rxrpc_put_local(local);
 198         ret = -EADDRINUSE;
 199 error_unlock:
 200         release_sock(&rx->sk);
 201 error:
 202         _leave(" = %d", ret);
 203         return ret;
 204 }
 205
 206 /*
 207  * set the number of pending calls permitted on a listening socket
 208  */
 209 static int rxrpc_listen(struct socket *sock, int backlog)
 210 {
 211         struct sock *sk = sock->sk;
 212         struct rxrpc_sock *rx = rxrpc_sk(sk);
 213         unsigned int max, old;
 214         int ret;
 215
 216         _enter("%p,%d", rx, backlog);
 217
 218         lock_sock(&rx->sk);
 219
 220         switch (rx->sk.sk_state) {
 221         case RXRPC_UNBOUND:
 222                 ret = -EADDRNOTAVAIL;
 223                 break;
 224         case RXRPC_SERVER_BOUND:
 225         case RXRPC_SERVER_BOUND2:
 226                 ASSERT(rx->local != NULL);
 227                 max = READ_ONCE(rxrpc_max_backlog);
 228                 ret = -EINVAL;
 229                 if (backlog == INT_MAX)
 230                         backlog = max;
 231                 else if (backlog < 0 || backlog > max)
 232                         break;
 233                 old = sk->sk_max_ack_backlog;
 234                 sk->sk_max_ack_backlog = backlog;
 235                 ret = rxrpc_service_prealloc(rx, GFP_KERNEL);
 236                 if (ret == 0)
 237                         rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 238                 else
 239                         sk->sk_max_ack_backlog = old;
 240                 break;
 241         case RXRPC_SERVER_LISTENING:
 242                 if (backlog == 0) {
 243                         rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
 244                         sk->sk_max_ack_backlog = 0;
 245                         rxrpc_discard_prealloc(rx);
 246                         ret = 0;
 247                         break;
 248                 }
 249         default:
 250                 ret = -EBUSY;
 251                 break;
 252         }
 253
 254         release_sock(&rx->sk);
 255         _leave(" = %d", ret);
 256         return ret;
 257 }
 258
 259 /**
 260  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 261  * @sock: The socket on which to make the call
 262  * @srx: The address of the peer to contact
 263  * @key: The security context to use (defaults to socket setting)
 264  * @user_call_ID: The ID to use
 265  * @tx_total_len: Total length of data to transmit during the call (or -1)
 266  * @gfp: The allocation constraints
 267  * @notify_rx: Where to send notifications instead of socket queue
 268  *
 269  * Allow a kernel service to begin a call on the nominated socket.  This just
 270  * sets up all the internal tracking structures and allocates connection and
 271  * call IDs as appropriate.  The call to be used is returned.
 272  *
 273  * The default socket destination address and security may be overridden by
 274  * supplying @srx and @key.
 275  */
 276 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 277                                            struct sockaddr_rxrpc *srx,
 278                                            struct key *key,
 279                                            unsigned long user_call_ID,
 280                                            s64 tx_total_len,
 281                                            gfp_t gfp,
 282                                            rxrpc_notify_rx_t notify_rx)
 283 {
 284         struct rxrpc_conn_parameters cp;
 285         struct rxrpc_call *call;
 286         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 287         int ret;
 288
 289         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 290
 291         ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
 292         if (ret < 0)
 293                 return ERR_PTR(ret);
 294
 295         lock_sock(&rx->sk);
 296
 297         if (!key)
 298                 key = rx->key;
 299         if (key && !key->payload.data[0])
 300                 key = NULL; /* a no-security key */
 301
 302         memset(&cp, 0, sizeof(cp));
 303         cp.local                = rx->local;
 304         cp.key                  = key;
 305         cp.security_level       = 0;
 306         cp.exclusive            = false;
 307         cp.service_id           = srx->srx_service;
 308         call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, tx_total_len,
 309                                      gfp);
 310         /* The socket has been unlocked. */
 311         if (!IS_ERR(call))
 312                 call->notify_rx = notify_rx;
 313
 314         mutex_unlock(&call->user_mutex);
 315         _leave(" = %p", call);
 316         return call;
 317 }
 318 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 319
 320 /**
 321  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 322  * @sock: The socket the call is on
 323  * @call: The call to end
 324  *
 325  * Allow a kernel service to end a call it was using.  The call must be
 326  * complete before this is called (the call should be aborted if necessary).
 327  */
 328 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
 329 {
 330         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 331
 332         mutex_lock(&call->user_mutex);
 333         rxrpc_release_call(rxrpc_sk(sock->sk), call);
 334         mutex_unlock(&call->user_mutex);
 335         rxrpc_put_call(call, rxrpc_call_put_kernel);
 336 }
 337 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 338
 339 /**
 340  * rxrpc_kernel_new_call_notification - Get notifications of new calls
 341  * @sock: The socket to intercept received messages on
 342  * @notify_new_call: Function to be called when new calls appear
 343  * @discard_new_call: Function to discard preallocated calls
 344  *
 345  * Allow a kernel service to be given notifications about new calls.
 346  */
 347 void rxrpc_kernel_new_call_notification(
 348         struct socket *sock,
 349         rxrpc_notify_new_call_t notify_new_call,
 350         rxrpc_discard_new_call_t discard_new_call)
 351 {
 352         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 353
 354         rx->notify_new_call = notify_new_call;
 355         rx->discard_new_call = discard_new_call;
 356 }
 357 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 358
 359 /*
 360  * connect an RxRPC socket
 361  * - this just targets it at a specific destination; no actual connection
 362  *   negotiation takes place
 363  */
 364 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 365                          int addr_len, int flags)
 366 {
 367         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 368         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 369         int ret;
 370
 371         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 372
 373         ret = rxrpc_validate_address(rx, srx, addr_len);
 374         if (ret < 0) {
 375                 _leave(" = %d [bad addr]", ret);
 376                 return ret;
 377         }
 378
 379         lock_sock(&rx->sk);
 380
 381         ret = -EISCONN;
 382         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 383                 goto error;
 384
 385         switch (rx->sk.sk_state) {
 386         case RXRPC_UNBOUND:
 387                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 388         case RXRPC_CLIENT_UNBOUND:
 389         case RXRPC_CLIENT_BOUND:
 390                 break;
 391         default:
 392                 ret = -EBUSY;
 393                 goto error;
 394         }
 395
 396         rx->connect_srx = *srx;
 397         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 398         ret = 0;
 399
 400 error:
 401         release_sock(&rx->sk);
 402         return ret;
 403 }
 404
 405 /*
 406  * send a message through an RxRPC socket
 407  * - in a client this does a number of things:
 408  *   - finds/sets up a connection for the security specified (if any)
 409  *   - initiates a call (ID in control data)
 410  *   - ends the request phase of a call (if MSG_MORE is not set)
 411  *   - sends a call data packet
 412  *   - may send an abort (abort code in control data)
 413  */
 414 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 415 {
 416         struct rxrpc_local *local;
 417         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 418         int ret;
 419
 420         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 421
 422         if (m->msg_flags & MSG_OOB)
 423                 return -EOPNOTSUPP;
 424
 425         if (m->msg_name) {
 426                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 427                 if (ret < 0) {
 428                         _leave(" = %d [bad addr]", ret);
 429                         return ret;
 430                 }
 431         }
 432
 433         lock_sock(&rx->sk);
 434
 435         switch (rx->sk.sk_state) {
 436         case RXRPC_UNBOUND:
 437                 rx->srx.srx_family = AF_RXRPC;
 438                 rx->srx.srx_service = 0;
 439                 rx->srx.transport_type = SOCK_DGRAM;
 440                 rx->srx.transport.family = rx->family;
 441                 switch (rx->family) {
 442                 case AF_INET:
 443                         rx->srx.transport_len = sizeof(struct sockaddr_in);
 444                         break;
 445 #ifdef CONFIG_AF_RXRPC_IPV6
 446                 case AF_INET6:
 447                         rx->srx.transport_len = sizeof(struct sockaddr_in6);
 448                         break;
 449 #endif
 450                 default:
 451                         ret = -EAFNOSUPPORT;
 452                         goto error_unlock;
 453                 }
 454                 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
 455                 if (IS_ERR(local)) {
 456                         ret = PTR_ERR(local);
 457                         goto error_unlock;
 458                 }
 459
 460                 rx->local = local;
 461                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 462                 /* Fall through */
 463
 464         case RXRPC_CLIENT_UNBOUND:
 465         case RXRPC_CLIENT_BOUND:
 466                 if (!m->msg_name &&
 467                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 468                         m->msg_name = &rx->connect_srx;
 469                         m->msg_namelen = sizeof(rx->connect_srx);
 470                 }
 471         case RXRPC_SERVER_BOUND:
 472         case RXRPC_SERVER_LISTENING:
 473                 ret = rxrpc_do_sendmsg(rx, m, len);
 474                 /* The socket has been unlocked */
 475                 goto out;
 476         default:
 477                 ret = -EINVAL;
 478                 goto error_unlock;
 479         }
 480
 481 error_unlock:
 482         release_sock(&rx->sk);
 483 out:
 484         _leave(" = %d", ret);
 485         return ret;
 486 }
 487
 488 /*
 489  * set RxRPC socket options
 490  */
 491 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 492                             char __user *optval, unsigned int optlen)
 493 {
 494         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 495         unsigned int min_sec_level;
 496         u16 service_upgrade[2];
 497         int ret;
 498
 499         _enter(",%d,%d,,%d", level, optname, optlen);
 500
 501         lock_sock(&rx->sk);
 502         ret = -EOPNOTSUPP;
 503
 504         if (level == SOL_RXRPC) {
 505                 switch (optname) {
 506                 case RXRPC_EXCLUSIVE_CONNECTION:
 507                         ret = -EINVAL;
 508                         if (optlen != 0)
 509                                 goto error;
 510                         ret = -EISCONN;
 511                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 512                                 goto error;
 513                         rx->exclusive = true;
 514                         goto success;
 515
 516                 case RXRPC_SECURITY_KEY:
 517                         ret = -EINVAL;
 518                         if (rx->key)
 519                                 goto error;
 520                         ret = -EISCONN;
 521                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 522                                 goto error;
 523                         ret = rxrpc_request_key(rx, optval, optlen);
 524                         goto error;
 525
 526                 case RXRPC_SECURITY_KEYRING:
 527                         ret = -EINVAL;
 528                         if (rx->key)
 529                                 goto error;
 530                         ret = -EISCONN;
 531                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 532                                 goto error;
 533                         ret = rxrpc_server_keyring(rx, optval, optlen);
 534                         goto error;
 535
 536                 case RXRPC_MIN_SECURITY_LEVEL:
 537                         ret = -EINVAL;
 538                         if (optlen != sizeof(unsigned int))
 539                                 goto error;
 540                         ret = -EISCONN;
 541                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 542                                 goto error;
 543                         ret = get_user(min_sec_level,
 544                                        (unsigned int __user *) optval);
 545                         if (ret < 0)
 546                                 goto error;
 547                         ret = -EINVAL;
 548                         if (min_sec_level > RXRPC_SECURITY_MAX)
 549                                 goto error;
 550                         rx->min_sec_level = min_sec_level;
 551                         goto success;
 552
 553                 case RXRPC_UPGRADEABLE_SERVICE:
 554                         ret = -EINVAL;
 555                         if (optlen != sizeof(service_upgrade) ||
 556                             rx->service_upgrade.from != 0)
 557                                 goto error;
 558                         ret = -EISCONN;
 559                         if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
 560                                 goto error;
 561                         ret = -EFAULT;
 562                         if (copy_from_user(service_upgrade, optval,
 563                                            sizeof(service_upgrade)) != 0)
 564                                 goto error;
 565                         ret = -EINVAL;
 566                         if ((service_upgrade[0] != rx->srx.srx_service ||
 567                              service_upgrade[1] != rx->second_service) &&
 568                             (service_upgrade[0] != rx->second_service ||
 569                              service_upgrade[1] != rx->srx.srx_service))
 570                                 goto error;
 571                         rx->service_upgrade.from = service_upgrade[0];
 572                         rx->service_upgrade.to = service_upgrade[1];
 573                         goto success;
 574
 575                 default:
 576                         break;
 577                 }
 578         }
 579
 580 success:
 581         ret = 0;
 582 error:
 583         release_sock(&rx->sk);
 584         return ret;
 585 }
 586
 587 /*
 588  * Get socket options.
 589  */
 590 static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
 591                             char __user *optval, int __user *_optlen)
 592 {
 593         int optlen;
 594
 595         if (level != SOL_RXRPC)
 596                 return -EOPNOTSUPP;
 597
 598         if (get_user(optlen, _optlen))
 599                 return -EFAULT;
 600
 601         switch (optname) {
 602         case RXRPC_SUPPORTED_CMSG:
 603                 if (optlen < sizeof(int))
 604                         return -ETOOSMALL;
 605                 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
 606                     put_user(sizeof(int), _optlen))
 607                         return -EFAULT;
 608                 return 0;
 609
 610         default:
 611                 return -EOPNOTSUPP;
 612         }
 613 }
 614
 615 /*
 616  * permit an RxRPC socket to be polled
 617  */
 618 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 619                                poll_table *wait)
 620 {
 621         struct sock *sk = sock->sk;
 622         struct rxrpc_sock *rx = rxrpc_sk(sk);
 623         unsigned int mask;
 624
 625         sock_poll_wait(file, sk_sleep(sk), wait);
 626         mask = 0;
 627
 628         /* the socket is readable if there are any messages waiting on the Rx
 629          * queue */
 630         if (!list_empty(&rx->recvmsg_q))
 631                 mask |= POLLIN | POLLRDNORM;
 632
 633         /* the socket is writable if there is space to add new data to the
 634          * socket; there is no guarantee that any particular call in progress
 635          * on the socket may have space in the Tx ACK window */
 636         if (rxrpc_writable(sk))
 637                 mask |= POLLOUT | POLLWRNORM;
 638
 639         return mask;
 640 }
 641
 642 /*
 643  * create an RxRPC socket
 644  */
 645 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 646                         int kern)
 647 {
 648         struct rxrpc_sock *rx;
 649         struct sock *sk;
 650
 651         _enter("%p,%d", sock, protocol);
 652
 653         /* we support transport protocol UDP/UDP6 only */
 654         if (protocol != PF_INET &&
 655             IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
 656                 return -EPROTONOSUPPORT;
 657
 658         if (sock->type != SOCK_DGRAM)
 659                 return -ESOCKTNOSUPPORT;
 660
 661         sock->ops = &rxrpc_rpc_ops;
 662         sock->state = SS_UNCONNECTED;
 663
 664         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 665         if (!sk)
 666                 return -ENOMEM;
 667
 668         sock_init_data(sock, sk);
 669         sock_set_flag(sk, SOCK_RCU_FREE);
 670         sk->sk_state            = RXRPC_UNBOUND;
 671         sk->sk_write_space      = rxrpc_write_space;
 672         sk->sk_max_ack_backlog  = 0;
 673         sk->sk_destruct         = rxrpc_sock_destructor;
 674
 675         rx = rxrpc_sk(sk);
 676         rx->family = protocol;
 677         rx->calls = RB_ROOT;
 678
 679         spin_lock_init(&rx->incoming_lock);
 680         INIT_LIST_HEAD(&rx->sock_calls);
 681         INIT_LIST_HEAD(&rx->to_be_accepted);
 682         INIT_LIST_HEAD(&rx->recvmsg_q);
 683         rwlock_init(&rx->recvmsg_lock);
 684         rwlock_init(&rx->call_lock);
 685         memset(&rx->srx, 0, sizeof(rx->srx));
 686
 687         _leave(" = 0 [%p]", rx);
 688         return 0;
 689 }
 690
 691 /*
 692  * Kill all the calls on a socket and shut it down.
 693  */
 694 static int rxrpc_shutdown(struct socket *sock, int flags)
 695 {
 696         struct sock *sk = sock->sk;
 697         struct rxrpc_sock *rx = rxrpc_sk(sk);
 698         int ret = 0;
 699
 700         _enter("%p,%d", sk, flags);
 701
 702         if (flags != SHUT_RDWR)
 703                 return -EOPNOTSUPP;
 704         if (sk->sk_state == RXRPC_CLOSE)
 705                 return -ESHUTDOWN;
 706
 707         lock_sock(sk);
 708
 709         spin_lock_bh(&sk->sk_receive_queue.lock);
 710         if (sk->sk_state < RXRPC_CLOSE) {
 711                 sk->sk_state = RXRPC_CLOSE;
 712                 sk->sk_shutdown = SHUTDOWN_MASK;
 713         } else {
 714                 ret = -ESHUTDOWN;
 715         }
 716         spin_unlock_bh(&sk->sk_receive_queue.lock);
 717
 718         rxrpc_discard_prealloc(rx);
 719
 720         release_sock(sk);
 721         return ret;
 722 }
 723
 724 /*
 725  * RxRPC socket destructor
 726  */
 727 static void rxrpc_sock_destructor(struct sock *sk)
 728 {
 729         _enter("%p", sk);
 730
 731         rxrpc_purge_queue(&sk->sk_receive_queue);
 732
 733         WARN_ON(atomic_read(&sk->sk_wmem_alloc));
 734         WARN_ON(!sk_unhashed(sk));
 735         WARN_ON(sk->sk_socket);
 736
 737         if (!sock_flag(sk, SOCK_DEAD)) {
 738                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 739                 return;
 740         }
 741 }
 742
 743 /*
 744  * release an RxRPC socket
 745  */
 746 static int rxrpc_release_sock(struct sock *sk)
 747 {
 748         struct rxrpc_sock *rx = rxrpc_sk(sk);
 749
 750         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 751
 752         /* declare the socket closed for business */
 753         sock_orphan(sk);
 754         sk->sk_shutdown = SHUTDOWN_MASK;
 755
 756         spin_lock_bh(&sk->sk_receive_queue.lock);
 757         sk->sk_state = RXRPC_CLOSE;
 758         spin_unlock_bh(&sk->sk_receive_queue.lock);
 759
 760         if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
 761                 write_lock(&rx->local->services_lock);
 762                 rcu_assign_pointer(rx->local->service, NULL);
 763                 write_unlock(&rx->local->services_lock);
 764         }
 765
 766         /* try to flush out this socket */
 767         rxrpc_discard_prealloc(rx);
 768         rxrpc_release_calls_on_socket(rx);
 769         flush_workqueue(rxrpc_workqueue);
 770         rxrpc_purge_queue(&sk->sk_receive_queue);
 771
 772         rxrpc_put_local(rx->local);
 773         rx->local = NULL;
 774         key_put(rx->key);
 775         rx->key = NULL;
 776         key_put(rx->securities);
 777         rx->securities = NULL;
 778         sock_put(sk);
 779
 780         _leave(" = 0");
 781         return 0;
 782 }
 783
 784 /*
 785  * release an RxRPC BSD socket on close() or equivalent
 786  */
 787 static int rxrpc_release(struct socket *sock)
 788 {
 789         struct sock *sk = sock->sk;
 790
 791         _enter("%p{%p}", sock, sk);
 792
 793         if (!sk)
 794                 return 0;
 795
 796         sock->sk = NULL;
 797
 798         return rxrpc_release_sock(sk);
 799 }
 800
 801 /*
 802  * RxRPC network protocol
 803  */
 804 static const struct proto_ops rxrpc_rpc_ops = {
 805         .family         = PF_RXRPC,
 806         .owner          = THIS_MODULE,
 807         .release        = rxrpc_release,
 808         .bind           = rxrpc_bind,
 809         .connect        = rxrpc_connect,
 810         .socketpair     = sock_no_socketpair,
 811         .accept         = sock_no_accept,
 812         .getname        = sock_no_getname,
 813         .poll           = rxrpc_poll,
 814         .ioctl          = sock_no_ioctl,
 815         .listen         = rxrpc_listen,
 816         .shutdown       = rxrpc_shutdown,
 817         .setsockopt     = rxrpc_setsockopt,
 818         .getsockopt     = rxrpc_getsockopt,
 819         .sendmsg        = rxrpc_sendmsg,
 820         .recvmsg        = rxrpc_recvmsg,
 821         .mmap           = sock_no_mmap,
 822         .sendpage       = sock_no_sendpage,
 823 };
 824
 825 static struct proto rxrpc_proto = {
 826         .name           = "RXRPC",
 827         .owner          = THIS_MODULE,
 828         .obj_size       = sizeof(struct rxrpc_sock),
 829         .max_header     = sizeof(struct rxrpc_wire_header),
 830 };
 831
 832 static const struct net_proto_family rxrpc_family_ops = {
 833         .family = PF_RXRPC,
 834         .create = rxrpc_create,
 835         .owner  = THIS_MODULE,
 836 };
 837
 838 /*
 839  * initialise and register the RxRPC protocol
 840  */
 841 static int __init af_rxrpc_init(void)
 842 {
 843         int ret = -1;
 844         unsigned int tmp;
 845
 846         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 847
 848         get_random_bytes(&tmp, sizeof(tmp));
 849         tmp &= 0x3fffffff;
 850         if (tmp == 0)
 851                 tmp = 1;
 852         idr_set_cursor(&rxrpc_client_conn_ids, tmp);
 853
 854         ret = -ENOMEM;
 855         rxrpc_call_jar = kmem_cache_create(
 856                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 857                 SLAB_HWCACHE_ALIGN, NULL);
 858         if (!rxrpc_call_jar) {
 859                 pr_notice("Failed to allocate call jar\n");
 860                 goto error_call_jar;
 861         }
 862
 863         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 864         if (!rxrpc_workqueue) {
 865                 pr_notice("Failed to allocate work queue\n");
 866                 goto error_work_queue;
 867         }
 868
 869         ret = rxrpc_init_security();
 870         if (ret < 0) {
 871                 pr_crit("Cannot initialise security\n");
 872                 goto error_security;
 873         }
 874
 875         ret = register_pernet_subsys(&rxrpc_net_ops);
 876         if (ret)
 877                 goto error_pernet;
 878
 879         ret = proto_register(&rxrpc_proto, 1);
 880         if (ret < 0) {
 881                 pr_crit("Cannot register protocol\n");
 882                 goto error_proto;
 883         }
 884
 885         ret = sock_register(&rxrpc_family_ops);
 886         if (ret < 0) {
 887                 pr_crit("Cannot register socket family\n");
 888                 goto error_sock;
 889         }
 890
 891         ret = register_key_type(&key_type_rxrpc);
 892         if (ret < 0) {
 893                 pr_crit("Cannot register client key type\n");
 894                 goto error_key_type;
 895         }
 896
 897         ret = register_key_type(&key_type_rxrpc_s);
 898         if (ret < 0) {
 899                 pr_crit("Cannot register server key type\n");
 900                 goto error_key_type_s;
 901         }
 902
 903         ret = rxrpc_sysctl_init();
 904         if (ret < 0) {
 905                 pr_crit("Cannot register sysctls\n");
 906                 goto error_sysctls;
 907         }
 908
 909         return 0;
 910
 911 error_sysctls:
 912         unregister_key_type(&key_type_rxrpc_s);
 913 error_key_type_s:
 914         unregister_key_type(&key_type_rxrpc);
 915 error_key_type:
 916         sock_unregister(PF_RXRPC);
 917 error_sock:
 918         proto_unregister(&rxrpc_proto);
 919 error_proto:
 920         unregister_pernet_subsys(&rxrpc_net_ops);
 921 error_pernet:
 922         rxrpc_exit_security();
 923 error_security:
 924         destroy_workqueue(rxrpc_workqueue);
 925 error_work_queue:
 926         kmem_cache_destroy(rxrpc_call_jar);
 927 error_call_jar:
 928         return ret;
 929 }
 930
 931 /*
 932  * unregister the RxRPC protocol
 933  */
 934 static void __exit af_rxrpc_exit(void)
 935 {
 936         _enter("");
 937         rxrpc_sysctl_exit();
 938         unregister_key_type(&key_type_rxrpc_s);
 939         unregister_key_type(&key_type_rxrpc);
 940         sock_unregister(PF_RXRPC);
 941         proto_unregister(&rxrpc_proto);
 942         unregister_pernet_subsys(&rxrpc_net_ops);
 943         ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
 944         ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
 945
 946         /* Make sure the local and peer records pinned by any dying connections
 947          * are released.
 948          */
 949         rcu_barrier();
 950         rxrpc_destroy_client_conn_ids();
 951
 952         destroy_workqueue(rxrpc_workqueue);
 953         rxrpc_exit_security();
 954         kmem_cache_destroy(rxrpc_call_jar);
 955         _leave("");
 956 }
 957
 958 module_init(af_rxrpc_init);
 959 module_exit(af_rxrpc_exit);