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