net/rxrpc/af_rxrpc.c

   1 /* AF_RXRPC implementation
   2  *
   3  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/net.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/poll.h>
  16 #include <linux/proc_fs.h>
  17 #include <net/sock.h>
  18 #include <net/af_rxrpc.h>
  19 #include "ar-internal.h"
  20
  21 MODULE_DESCRIPTION("RxRPC network protocol");
  22 MODULE_AUTHOR("Red Hat, Inc.");
  23 MODULE_LICENSE("GPL");
  24 MODULE_ALIAS_NETPROTO(PF_RXRPC);
  25
  26 unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO;
  27 module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
  28 MODULE_PARM_DESC(rxrpc_debug, "RxRPC debugging mask");
  29
  30 static int sysctl_rxrpc_max_qlen __read_mostly = 10;
  31
  32 static struct proto rxrpc_proto;
  33 static const struct proto_ops rxrpc_rpc_ops;
  34
  35 /* local epoch for detecting local-end reset */
  36 __be32 rxrpc_epoch;
  37
  38 /* current debugging ID */
  39 atomic_t rxrpc_debug_id;
  40
  41 /* count of skbs currently in use */
  42 atomic_t rxrpc_n_skbs;
  43
  44 struct workqueue_struct *rxrpc_workqueue;
  45
  46 static void rxrpc_sock_destructor(struct sock *);
  47
  48 /*
  49  * see if an RxRPC socket is currently writable
  50  */
  51 static inline int rxrpc_writable(struct sock *sk)
  52 {
  53         return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf;
  54 }
  55
  56 /*
  57  * wait for write bufferage to become available
  58  */
  59 static void rxrpc_write_space(struct sock *sk)
  60 {
  61         _enter("%p", sk);
  62         read_lock(&sk->sk_callback_lock);
  63         if (rxrpc_writable(sk)) {
  64                 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
  65                         wake_up_interruptible(sk->sk_sleep);
  66                 sk_wake_async(sk, 2, POLL_OUT);
  67         }
  68         read_unlock(&sk->sk_callback_lock);
  69 }
  70
  71 /*
  72  * validate an RxRPC address
  73  */
  74 static int rxrpc_validate_address(struct rxrpc_sock *rx,
  75                                   struct sockaddr_rxrpc *srx,
  76                                   int len)
  77 {
  78         if (len < sizeof(struct sockaddr_rxrpc))
  79                 return -EINVAL;
  80
  81         if (srx->srx_family != AF_RXRPC)
  82                 return -EAFNOSUPPORT;
  83
  84         if (srx->transport_type != SOCK_DGRAM)
  85                 return -ESOCKTNOSUPPORT;
  86
  87         len -= offsetof(struct sockaddr_rxrpc, transport);
  88         if (srx->transport_len < sizeof(sa_family_t) ||
  89             srx->transport_len > len)
  90                 return -EINVAL;
  91
  92         if (srx->transport.family != rx->proto)
  93                 return -EAFNOSUPPORT;
  94
  95         switch (srx->transport.family) {
  96         case AF_INET:
  97                 _debug("INET: %x @ %u.%u.%u.%u",
  98                        ntohs(srx->transport.sin.sin_port),
  99                        NIPQUAD(srx->transport.sin.sin_addr));
 100                 if (srx->transport_len > 8)
 101                         memset((void *)&srx->transport + 8, 0,
 102                                srx->transport_len - 8);
 103                 break;
 104
 105         case AF_INET6:
 106         default:
 107                 return -EAFNOSUPPORT;
 108         }
 109
 110         return 0;
 111 }
 112
 113 /*
 114  * bind a local address to an RxRPC socket
 115  */
 116 static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len)
 117 {
 118         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr;
 119         struct sock *sk = sock->sk;
 120         struct rxrpc_local *local;
 121         struct rxrpc_sock *rx = rxrpc_sk(sk), *prx;
 122         __be16 service_id;
 123         int ret;
 124
 125         _enter("%p,%p,%d", rx, saddr, len);
 126
 127         ret = rxrpc_validate_address(rx, srx, len);
 128         if (ret < 0)
 129                 goto error;
 130
 131         lock_sock(&rx->sk);
 132
 133         if (rx->sk.sk_state != RXRPC_UNCONNECTED) {
 134                 ret = -EINVAL;
 135                 goto error_unlock;
 136         }
 137
 138         memcpy(&rx->srx, srx, sizeof(rx->srx));
 139
 140         /* find a local transport endpoint if we don't have one already */
 141         local = rxrpc_lookup_local(&rx->srx);
 142         if (IS_ERR(local)) {
 143                 ret = PTR_ERR(local);
 144                 goto error_unlock;
 145         }
 146
 147         rx->local = local;
 148         if (srx->srx_service) {
 149                 service_id = htons(srx->srx_service);
 150                 write_lock_bh(&local->services_lock);
 151                 list_for_each_entry(prx, &local->services, listen_link) {
 152                         if (prx->service_id == service_id)
 153                                 goto service_in_use;
 154                 }
 155
 156                 rx->service_id = service_id;
 157                 list_add_tail(&rx->listen_link, &local->services);
 158                 write_unlock_bh(&local->services_lock);
 159
 160                 rx->sk.sk_state = RXRPC_SERVER_BOUND;
 161         } else {
 162                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 163         }
 164
 165         release_sock(&rx->sk);
 166         _leave(" = 0");
 167         return 0;
 168
 169 service_in_use:
 170         ret = -EADDRINUSE;
 171         write_unlock_bh(&local->services_lock);
 172 error_unlock:
 173         release_sock(&rx->sk);
 174 error:
 175         _leave(" = %d", ret);
 176         return ret;
 177 }
 178
 179 /*
 180  * set the number of pending calls permitted on a listening socket
 181  */
 182 static int rxrpc_listen(struct socket *sock, int backlog)
 183 {
 184         struct sock *sk = sock->sk;
 185         struct rxrpc_sock *rx = rxrpc_sk(sk);
 186         int ret;
 187
 188         _enter("%p,%d", rx, backlog);
 189
 190         lock_sock(&rx->sk);
 191
 192         switch (rx->sk.sk_state) {
 193         case RXRPC_UNCONNECTED:
 194                 ret = -EADDRNOTAVAIL;
 195                 break;
 196         case RXRPC_CLIENT_BOUND:
 197         case RXRPC_CLIENT_CONNECTED:
 198         default:
 199                 ret = -EBUSY;
 200                 break;
 201         case RXRPC_SERVER_BOUND:
 202                 ASSERT(rx->local != NULL);
 203                 sk->sk_max_ack_backlog = backlog;
 204                 rx->sk.sk_state = RXRPC_SERVER_LISTENING;
 205                 ret = 0;
 206                 break;
 207         }
 208
 209         release_sock(&rx->sk);
 210         _leave(" = %d", ret);
 211         return ret;
 212 }
 213
 214 /*
 215  * find a transport by address
 216  */
 217 static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock,
 218                                                        struct sockaddr *addr,
 219                                                        int addr_len, int flags,
 220                                                        gfp_t gfp)
 221 {
 222         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 223         struct rxrpc_transport *trans;
 224         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 225         struct rxrpc_peer *peer;
 226
 227         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 228
 229         ASSERT(rx->local != NULL);
 230         ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED);
 231
 232         if (rx->srx.transport_type != srx->transport_type)
 233                 return ERR_PTR(-ESOCKTNOSUPPORT);
 234         if (rx->srx.transport.family != srx->transport.family)
 235                 return ERR_PTR(-EAFNOSUPPORT);
 236
 237         /* find a remote transport endpoint from the local one */
 238         peer = rxrpc_get_peer(srx, gfp);
 239         if (IS_ERR(peer))
 240                 return ERR_PTR(PTR_ERR(peer));
 241
 242         /* find a transport */
 243         trans = rxrpc_get_transport(rx->local, peer, gfp);
 244         rxrpc_put_peer(peer);
 245         _leave(" = %p", trans);
 246         return trans;
 247 }
 248
 249 /**
 250  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 251  * @sock: The socket on which to make the call
 252  * @srx: The address of the peer to contact (defaults to socket setting)
 253  * @key: The security context to use (defaults to socket setting)
 254  * @user_call_ID: The ID to use
 255  *
 256  * Allow a kernel service to begin a call on the nominated socket.  This just
 257  * sets up all the internal tracking structures and allocates connection and
 258  * call IDs as appropriate.  The call to be used is returned.
 259  *
 260  * The default socket destination address and security may be overridden by
 261  * supplying @srx and @key.
 262  */
 263 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 264                                            struct sockaddr_rxrpc *srx,
 265                                            struct key *key,
 266                                            unsigned long user_call_ID,
 267                                            gfp_t gfp)
 268 {
 269         struct rxrpc_conn_bundle *bundle;
 270         struct rxrpc_transport *trans;
 271         struct rxrpc_call *call;
 272         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 273         __be16 service_id;
 274
 275         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 276
 277         lock_sock(&rx->sk);
 278
 279         if (srx) {
 280                 trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx,
 281                                                 sizeof(*srx), 0, gfp);
 282                 if (IS_ERR(trans)) {
 283                         call = ERR_PTR(PTR_ERR(trans));
 284                         trans = NULL;
 285                         goto out;
 286                 }
 287         } else {
 288                 trans = rx->trans;
 289                 if (!trans) {
 290                         call = ERR_PTR(-ENOTCONN);
 291                         goto out;
 292                 }
 293                 atomic_inc(&trans->usage);
 294         }
 295
 296         service_id = rx->service_id;
 297         if (srx)
 298                 service_id = htons(srx->srx_service);
 299
 300         if (!key)
 301                 key = rx->key;
 302         if (key && !key->payload.data)
 303                 key = NULL; /* a no-security key */
 304
 305         bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp);
 306         if (IS_ERR(bundle)) {
 307                 call = ERR_PTR(PTR_ERR(bundle));
 308                 goto out;
 309         }
 310
 311         call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true,
 312                                      gfp);
 313         rxrpc_put_bundle(trans, bundle);
 314 out:
 315         rxrpc_put_transport(trans);
 316         release_sock(&rx->sk);
 317         _leave(" = %p", call);
 318         return call;
 319 }
 320
 321 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 322
 323 /**
 324  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 325  * @call: The call to end
 326  *
 327  * Allow a kernel service to end a call it was using.  The call must be
 328  * complete before this is called (the call should be aborted if necessary).
 329  */
 330 void rxrpc_kernel_end_call(struct rxrpc_call *call)
 331 {
 332         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 333         rxrpc_remove_user_ID(call->socket, call);
 334         rxrpc_put_call(call);
 335 }
 336
 337 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 338
 339 /**
 340  * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages
 341  * @sock: The socket to intercept received messages on
 342  * @interceptor: The function to pass the messages to
 343  *
 344  * Allow a kernel service to intercept messages heading for the Rx queue on an
 345  * RxRPC socket.  They get passed to the specified function instead.
 346  * @interceptor should free the socket buffers it is given.  @interceptor is
 347  * called with the socket receive queue spinlock held and softirqs disabled -
 348  * this ensures that the messages will be delivered in the right order.
 349  */
 350 void rxrpc_kernel_intercept_rx_messages(struct socket *sock,
 351                                         rxrpc_interceptor_t interceptor)
 352 {
 353         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 354
 355         _enter("");
 356         rx->interceptor = interceptor;
 357 }
 358
 359 EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages);
 360
 361 /*
 362  * connect an RxRPC socket
 363  * - this just targets it at a specific destination; no actual connection
 364  *   negotiation takes place
 365  */
 366 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 367                          int addr_len, int flags)
 368 {
 369         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
 370         struct sock *sk = sock->sk;
 371         struct rxrpc_transport *trans;
 372         struct rxrpc_local *local;
 373         struct rxrpc_sock *rx = rxrpc_sk(sk);
 374         int ret;
 375
 376         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 377
 378         ret = rxrpc_validate_address(rx, srx, addr_len);
 379         if (ret < 0) {
 380                 _leave(" = %d [bad addr]", ret);
 381                 return ret;
 382         }
 383
 384         lock_sock(&rx->sk);
 385
 386         switch (rx->sk.sk_state) {
 387         case RXRPC_UNCONNECTED:
 388                 /* find a local transport endpoint if we don't have one already */
 389                 ASSERTCMP(rx->local, ==, NULL);
 390                 rx->srx.srx_family = AF_RXRPC;
 391                 rx->srx.srx_service = 0;
 392                 rx->srx.transport_type = srx->transport_type;
 393                 rx->srx.transport_len = sizeof(sa_family_t);
 394                 rx->srx.transport.family = srx->transport.family;
 395                 local = rxrpc_lookup_local(&rx->srx);
 396                 if (IS_ERR(local)) {
 397                         release_sock(&rx->sk);
 398                         return PTR_ERR(local);
 399                 }
 400                 rx->local = local;
 401                 rx->sk.sk_state = RXRPC_CLIENT_BOUND;
 402         case RXRPC_CLIENT_BOUND:
 403                 break;
 404         case RXRPC_CLIENT_CONNECTED:
 405                 release_sock(&rx->sk);
 406                 return -EISCONN;
 407         default:
 408                 release_sock(&rx->sk);
 409                 return -EBUSY; /* server sockets can't connect as well */
 410         }
 411
 412         trans = rxrpc_name_to_transport(sock, addr, addr_len, flags,
 413                                         GFP_KERNEL);
 414         if (IS_ERR(trans)) {
 415                 release_sock(&rx->sk);
 416                 _leave(" = %ld", PTR_ERR(trans));
 417                 return PTR_ERR(trans);
 418         }
 419
 420         rx->trans = trans;
 421         rx->service_id = htons(srx->srx_service);
 422         rx->sk.sk_state = RXRPC_CLIENT_CONNECTED;
 423
 424         release_sock(&rx->sk);
 425         return 0;
 426 }
 427
 428 /*
 429  * send a message through an RxRPC socket
 430  * - in a client this does a number of things:
 431  *   - finds/sets up a connection for the security specified (if any)
 432  *   - initiates a call (ID in control data)
 433  *   - ends the request phase of a call (if MSG_MORE is not set)
 434  *   - sends a call data packet
 435  *   - may send an abort (abort code in control data)
 436  */
 437 static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock,
 438                          struct msghdr *m, size_t len)
 439 {
 440         struct rxrpc_transport *trans;
 441         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 442         int ret;
 443
 444         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 445
 446         if (m->msg_flags & MSG_OOB)
 447                 return -EOPNOTSUPP;
 448
 449         if (m->msg_name) {
 450                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 451                 if (ret < 0) {
 452                         _leave(" = %d [bad addr]", ret);
 453                         return ret;
 454                 }
 455         }
 456
 457         trans = NULL;
 458         lock_sock(&rx->sk);
 459
 460         if (m->msg_name) {
 461                 ret = -EISCONN;
 462                 trans = rxrpc_name_to_transport(sock, m->msg_name,
 463                                                 m->msg_namelen, 0, GFP_KERNEL);
 464                 if (IS_ERR(trans)) {
 465                         ret = PTR_ERR(trans);
 466                         trans = NULL;
 467                         goto out;
 468                 }
 469         } else {
 470                 trans = rx->trans;
 471                 if (trans)
 472                         atomic_inc(&trans->usage);
 473         }
 474
 475         switch (rx->sk.sk_state) {
 476         case RXRPC_SERVER_LISTENING:
 477                 if (!m->msg_name) {
 478                         ret = rxrpc_server_sendmsg(iocb, rx, m, len);
 479                         break;
 480                 }
 481         case RXRPC_SERVER_BOUND:
 482         case RXRPC_CLIENT_BOUND:
 483                 if (!m->msg_name) {
 484                         ret = -ENOTCONN;
 485                         break;
 486                 }
 487         case RXRPC_CLIENT_CONNECTED:
 488                 ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len);
 489                 break;
 490         default:
 491                 ret = -ENOTCONN;
 492                 break;
 493         }
 494
 495 out:
 496         release_sock(&rx->sk);
 497         if (trans)
 498                 rxrpc_put_transport(trans);
 499         _leave(" = %d", ret);
 500         return ret;
 501 }
 502
 503 /*
 504  * set RxRPC socket options
 505  */
 506 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 507                             char __user *optval, int optlen)
 508 {
 509         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 510         unsigned min_sec_level;
 511         int ret;
 512
 513         _enter(",%d,%d,,%d", level, optname, optlen);
 514
 515         lock_sock(&rx->sk);
 516         ret = -EOPNOTSUPP;
 517
 518         if (level == SOL_RXRPC) {
 519                 switch (optname) {
 520                 case RXRPC_EXCLUSIVE_CONNECTION:
 521                         ret = -EINVAL;
 522                         if (optlen != 0)
 523                                 goto error;
 524                         ret = -EISCONN;
 525                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 526                                 goto error;
 527                         set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags);
 528                         goto success;
 529
 530                 case RXRPC_SECURITY_KEY:
 531                         ret = -EINVAL;
 532                         if (rx->key)
 533                                 goto error;
 534                         ret = -EISCONN;
 535                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 536                                 goto error;
 537                         ret = rxrpc_request_key(rx, optval, optlen);
 538                         goto error;
 539
 540                 case RXRPC_SECURITY_KEYRING:
 541                         ret = -EINVAL;
 542                         if (rx->key)
 543                                 goto error;
 544                         ret = -EISCONN;
 545                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 546                                 goto error;
 547                         ret = rxrpc_server_keyring(rx, optval, optlen);
 548                         goto error;
 549
 550                 case RXRPC_MIN_SECURITY_LEVEL:
 551                         ret = -EINVAL;
 552                         if (optlen != sizeof(unsigned))
 553                                 goto error;
 554                         ret = -EISCONN;
 555                         if (rx->sk.sk_state != RXRPC_UNCONNECTED)
 556                                 goto error;
 557                         ret = get_user(min_sec_level,
 558                                        (unsigned __user *) optval);
 559                         if (ret < 0)
 560                                 goto error;
 561                         ret = -EINVAL;
 562                         if (min_sec_level > RXRPC_SECURITY_MAX)
 563                                 goto error;
 564                         rx->min_sec_level = min_sec_level;
 565                         goto success;
 566
 567                 default:
 568                         break;
 569                 }
 570         }
 571
 572 success:
 573         ret = 0;
 574 error:
 575         release_sock(&rx->sk);
 576         return ret;
 577 }
 578
 579 /*
 580  * permit an RxRPC socket to be polled
 581  */
 582 static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
 583                                poll_table *wait)
 584 {
 585         unsigned int mask;
 586         struct sock *sk = sock->sk;
 587
 588         poll_wait(file, sk->sk_sleep, wait);
 589         mask = 0;
 590
 591         /* the socket is readable if there are any messages waiting on the Rx
 592          * queue */
 593         if (!skb_queue_empty(&sk->sk_receive_queue))
 594                 mask |= POLLIN | POLLRDNORM;
 595
 596         /* the socket is writable if there is space to add new data to the
 597          * socket; there is no guarantee that any particular call in progress
 598          * on the socket may have space in the Tx ACK window */
 599         if (rxrpc_writable(sk))
 600                 mask |= POLLOUT | POLLWRNORM;
 601
 602         return mask;
 603 }
 604
 605 /*
 606  * create an RxRPC socket
 607  */
 608 static int rxrpc_create(struct socket *sock, int protocol)
 609 {
 610         struct rxrpc_sock *rx;
 611         struct sock *sk;
 612
 613         _enter("%p,%d", sock, protocol);
 614
 615         /* we support transport protocol UDP only */
 616         if (protocol != PF_INET)
 617                 return -EPROTONOSUPPORT;
 618
 619         if (sock->type != SOCK_DGRAM)
 620                 return -ESOCKTNOSUPPORT;
 621
 622         sock->ops = &rxrpc_rpc_ops;
 623         sock->state = SS_UNCONNECTED;
 624
 625         sk = sk_alloc(PF_RXRPC, GFP_KERNEL, &rxrpc_proto, 1);
 626         if (!sk)
 627                 return -ENOMEM;
 628
 629         sock_init_data(sock, sk);
 630         sk->sk_state            = RXRPC_UNCONNECTED;
 631         sk->sk_write_space      = rxrpc_write_space;
 632         sk->sk_max_ack_backlog  = sysctl_rxrpc_max_qlen;
 633         sk->sk_destruct         = rxrpc_sock_destructor;
 634
 635         rx = rxrpc_sk(sk);
 636         rx->proto = protocol;
 637         rx->calls = RB_ROOT;
 638
 639         INIT_LIST_HEAD(&rx->listen_link);
 640         INIT_LIST_HEAD(&rx->secureq);
 641         INIT_LIST_HEAD(&rx->acceptq);
 642         rwlock_init(&rx->call_lock);
 643         memset(&rx->srx, 0, sizeof(rx->srx));
 644
 645         _leave(" = 0 [%p]", rx);
 646         return 0;
 647 }
 648
 649 /*
 650  * RxRPC socket destructor
 651  */
 652 static void rxrpc_sock_destructor(struct sock *sk)
 653 {
 654         _enter("%p", sk);
 655
 656         rxrpc_purge_queue(&sk->sk_receive_queue);
 657
 658         BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
 659         BUG_TRAP(sk_unhashed(sk));
 660         BUG_TRAP(!sk->sk_socket);
 661
 662         if (!sock_flag(sk, SOCK_DEAD)) {
 663                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 664                 return;
 665         }
 666 }
 667
 668 /*
 669  * release an RxRPC socket
 670  */
 671 static int rxrpc_release_sock(struct sock *sk)
 672 {
 673         struct rxrpc_sock *rx = rxrpc_sk(sk);
 674
 675         _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 676
 677         /* declare the socket closed for business */
 678         sock_orphan(sk);
 679         sk->sk_shutdown = SHUTDOWN_MASK;
 680
 681         spin_lock_bh(&sk->sk_receive_queue.lock);
 682         sk->sk_state = RXRPC_CLOSE;
 683         spin_unlock_bh(&sk->sk_receive_queue.lock);
 684
 685         ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1);
 686
 687         if (!list_empty(&rx->listen_link)) {
 688                 write_lock_bh(&rx->local->services_lock);
 689                 list_del(&rx->listen_link);
 690                 write_unlock_bh(&rx->local->services_lock);
 691         }
 692
 693         /* try to flush out this socket */
 694         rxrpc_release_calls_on_socket(rx);
 695         flush_workqueue(rxrpc_workqueue);
 696         rxrpc_purge_queue(&sk->sk_receive_queue);
 697
 698         if (rx->conn) {
 699                 rxrpc_put_connection(rx->conn);
 700                 rx->conn = NULL;
 701         }
 702
 703         if (rx->bundle) {
 704                 rxrpc_put_bundle(rx->trans, rx->bundle);
 705                 rx->bundle = NULL;
 706         }
 707         if (rx->trans) {
 708                 rxrpc_put_transport(rx->trans);
 709                 rx->trans = NULL;
 710         }
 711         if (rx->local) {
 712                 rxrpc_put_local(rx->local);
 713                 rx->local = NULL;
 714         }
 715
 716         key_put(rx->key);
 717         rx->key = NULL;
 718         key_put(rx->securities);
 719         rx->securities = NULL;
 720         sock_put(sk);
 721
 722         _leave(" = 0");
 723         return 0;
 724 }
 725
 726 /*
 727  * release an RxRPC BSD socket on close() or equivalent
 728  */
 729 static int rxrpc_release(struct socket *sock)
 730 {
 731         struct sock *sk = sock->sk;
 732
 733         _enter("%p{%p}", sock, sk);
 734
 735         if (!sk)
 736                 return 0;
 737
 738         sock->sk = NULL;
 739
 740         return rxrpc_release_sock(sk);
 741 }
 742
 743 /*
 744  * RxRPC network protocol
 745  */
 746 static const struct proto_ops rxrpc_rpc_ops = {
 747         .family         = PF_UNIX,
 748         .owner          = THIS_MODULE,
 749         .release        = rxrpc_release,
 750         .bind           = rxrpc_bind,
 751         .connect        = rxrpc_connect,
 752         .socketpair     = sock_no_socketpair,
 753         .accept         = sock_no_accept,
 754         .getname        = sock_no_getname,
 755         .poll           = rxrpc_poll,
 756         .ioctl          = sock_no_ioctl,
 757         .listen         = rxrpc_listen,
 758         .shutdown       = sock_no_shutdown,
 759         .setsockopt     = rxrpc_setsockopt,
 760         .getsockopt     = sock_no_getsockopt,
 761         .sendmsg        = rxrpc_sendmsg,
 762         .recvmsg        = rxrpc_recvmsg,
 763         .mmap           = sock_no_mmap,
 764         .sendpage       = sock_no_sendpage,
 765 };
 766
 767 static struct proto rxrpc_proto = {
 768         .name           = "RXRPC",
 769         .owner          = THIS_MODULE,
 770         .obj_size       = sizeof(struct rxrpc_sock),
 771         .max_header     = sizeof(struct rxrpc_header),
 772 };
 773
 774 static struct net_proto_family rxrpc_family_ops = {
 775         .family = PF_RXRPC,
 776         .create = rxrpc_create,
 777         .owner  = THIS_MODULE,
 778 };
 779
 780 /*
 781  * initialise and register the RxRPC protocol
 782  */
 783 static int __init af_rxrpc_init(void)
 784 {
 785         struct sk_buff *dummy_skb;
 786         int ret = -1;
 787
 788         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb));
 789
 790         rxrpc_epoch = htonl(get_seconds());
 791
 792         ret = -ENOMEM;
 793         rxrpc_call_jar = kmem_cache_create(
 794                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 795                 SLAB_HWCACHE_ALIGN, NULL);
 796         if (!rxrpc_call_jar) {
 797                 printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n");
 798                 goto error_call_jar;
 799         }
 800
 801         rxrpc_workqueue = create_workqueue("krxrpcd");
 802         if (!rxrpc_workqueue) {
 803                 printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n");
 804                 goto error_work_queue;
 805         }
 806
 807         ret = proto_register(&rxrpc_proto, 1);
 808         if (ret < 0) {
 809                 printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
 810                 goto error_proto;
 811         }
 812
 813         ret = sock_register(&rxrpc_family_ops);
 814         if (ret < 0) {
 815                 printk(KERN_CRIT "RxRPC: Cannot register socket family\n");
 816                 goto error_sock;
 817         }
 818
 819         ret = register_key_type(&key_type_rxrpc);
 820         if (ret < 0) {
 821                 printk(KERN_CRIT "RxRPC: Cannot register client key type\n");
 822                 goto error_key_type;
 823         }
 824
 825         ret = register_key_type(&key_type_rxrpc_s);
 826         if (ret < 0) {
 827                 printk(KERN_CRIT "RxRPC: Cannot register server key type\n");
 828                 goto error_key_type_s;
 829         }
 830
 831 #ifdef CONFIG_PROC_FS
 832         proc_net_fops_create("rxrpc_calls", 0, &rxrpc_call_seq_fops);
 833         proc_net_fops_create("rxrpc_conns", 0, &rxrpc_connection_seq_fops);
 834 #endif
 835         return 0;
 836
 837 error_key_type_s:
 838         unregister_key_type(&key_type_rxrpc);
 839 error_key_type:
 840         sock_unregister(PF_RXRPC);
 841 error_sock:
 842         proto_unregister(&rxrpc_proto);
 843 error_proto:
 844         destroy_workqueue(rxrpc_workqueue);
 845 error_work_queue:
 846         kmem_cache_destroy(rxrpc_call_jar);
 847 error_call_jar:
 848         return ret;
 849 }
 850
 851 /*
 852  * unregister the RxRPC protocol
 853  */
 854 static void __exit af_rxrpc_exit(void)
 855 {
 856         _enter("");
 857         unregister_key_type(&key_type_rxrpc_s);
 858         unregister_key_type(&key_type_rxrpc);
 859         sock_unregister(PF_RXRPC);
 860         proto_unregister(&rxrpc_proto);
 861         rxrpc_destroy_all_calls();
 862         rxrpc_destroy_all_connections();
 863         rxrpc_destroy_all_transports();
 864         rxrpc_destroy_all_peers();
 865         rxrpc_destroy_all_locals();
 866
 867         ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);
 868
 869         _debug("flush scheduled work");
 870         flush_workqueue(rxrpc_workqueue);
 871         proc_net_remove("rxrpc_conns");
 872         proc_net_remove("rxrpc_calls");
 873         destroy_workqueue(rxrpc_workqueue);
 874         kmem_cache_destroy(rxrpc_call_jar);
 875         _leave("");
 876 }
 877
 878 module_init(af_rxrpc_init);
 879 module_exit(af_rxrpc_exit);