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 refcount_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                 /* Fall through */
 250         default:
 251                 ret = -EBUSY;
 252                 break;
 253         }
 254
 255         release_sock(&rx->sk);
 256         _leave(" = %d", ret);
 257         return ret;
 258 }
 259
 260 /**
 261  * rxrpc_kernel_begin_call - Allow a kernel service to begin a call
 262  * @sock: The socket on which to make the call
 263  * @srx: The address of the peer to contact
 264  * @key: The security context to use (defaults to socket setting)
 265  * @user_call_ID: The ID to use
 266  * @tx_total_len: Total length of data to transmit during the call (or -1)
 267  * @gfp: The allocation constraints
 268  * @notify_rx: Where to send notifications instead of socket queue
 269  * @upgrade: Request service upgrade for call
 270  *
 271  * Allow a kernel service to begin a call on the nominated socket.  This just
 272  * sets up all the internal tracking structures and allocates connection and
 273  * call IDs as appropriate.  The call to be used is returned.
 274  *
 275  * The default socket destination address and security may be overridden by
 276  * supplying @srx and @key.
 277  */
 278 struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
 279                                            struct sockaddr_rxrpc *srx,
 280                                            struct key *key,
 281                                            unsigned long user_call_ID,
 282                                            s64 tx_total_len,
 283                                            gfp_t gfp,
 284                                            rxrpc_notify_rx_t notify_rx,
 285                                            bool upgrade)
 286 {
 287         struct rxrpc_conn_parameters cp;
 288         struct rxrpc_call_params p;
 289         struct rxrpc_call *call;
 290         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 291         int ret;
 292
 293         _enter(",,%x,%lx", key_serial(key), user_call_ID);
 294
 295         ret = rxrpc_validate_address(rx, srx, sizeof(*srx));
 296         if (ret < 0)
 297                 return ERR_PTR(ret);
 298
 299         lock_sock(&rx->sk);
 300
 301         if (!key)
 302                 key = rx->key;
 303         if (key && !key->payload.data[0])
 304                 key = NULL; /* a no-security key */
 305
 306         memset(&p, 0, sizeof(p));
 307         p.user_call_ID = user_call_ID;
 308         p.tx_total_len = tx_total_len;
 309
 310         memset(&cp, 0, sizeof(cp));
 311         cp.local                = rx->local;
 312         cp.key                  = key;
 313         cp.security_level       = 0;
 314         cp.exclusive            = false;
 315         cp.upgrade              = upgrade;
 316         cp.service_id           = srx->srx_service;
 317         call = rxrpc_new_client_call(rx, &cp, srx, &p, gfp);
 318         /* The socket has been unlocked. */
 319         if (!IS_ERR(call)) {
 320                 call->notify_rx = notify_rx;
 321                 mutex_unlock(&call->user_mutex);
 322         }
 323
 324         _leave(" = %p", call);
 325         return call;
 326 }
 327 EXPORT_SYMBOL(rxrpc_kernel_begin_call);
 328
 329 /*
 330  * Dummy function used to stop the notifier talking to recvmsg().
 331  */
 332 static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
 333                                   unsigned long call_user_ID)
 334 {
 335 }
 336
 337 /**
 338  * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
 339  * @sock: The socket the call is on
 340  * @call: The call to end
 341  *
 342  * Allow a kernel service to end a call it was using.  The call must be
 343  * complete before this is called (the call should be aborted if necessary).
 344  */
 345 void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
 346 {
 347         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 348
 349         mutex_lock(&call->user_mutex);
 350         rxrpc_release_call(rxrpc_sk(sock->sk), call);
 351
 352         /* Make sure we're not going to call back into a kernel service */
 353         if (call->notify_rx) {
 354                 spin_lock_bh(&call->notify_lock);
 355                 call->notify_rx = rxrpc_dummy_notify_rx;
 356                 spin_unlock_bh(&call->notify_lock);
 357         }
 358
 359         mutex_unlock(&call->user_mutex);
 360         rxrpc_put_call(call, rxrpc_call_put_kernel);
 361 }
 362 EXPORT_SYMBOL(rxrpc_kernel_end_call);
 363
 364 /**
 365  * rxrpc_kernel_check_life - Check to see whether a call is still alive
 366  * @sock: The socket the call is on
 367  * @call: The call to check
 368  *
 369  * Allow a kernel service to find out whether a call is still alive - ie. we're
 370  * getting ACKs from the server.  Returns a number representing the life state
 371  * which can be compared to that returned by a previous call.
 372  *
 373  * If this is a client call, ping ACKs will be sent to the server to find out
 374  * whether it's still responsive and whether the call is still alive on the
 375  * server.
 376  */
 377 u32 rxrpc_kernel_check_life(struct socket *sock, struct rxrpc_call *call)
 378 {
 379         return call->acks_latest;
 380 }
 381 EXPORT_SYMBOL(rxrpc_kernel_check_life);
 382
 383 /**
 384  * rxrpc_kernel_check_call - Check a call's state
 385  * @sock: The socket the call is on
 386  * @call: The call to check
 387  * @_compl: Where to store the completion state
 388  * @_abort_code: Where to store any abort code
 389  *
 390  * Allow a kernel service to query the state of a call and find out the manner
 391  * of its termination if it has completed.  Returns -EINPROGRESS if the call is
 392  * still going, 0 if the call finished successfully, -ECONNABORTED if the call
 393  * was aborted and an appropriate error if the call failed in some other way.
 394  */
 395 int rxrpc_kernel_check_call(struct socket *sock, struct rxrpc_call *call,
 396                             enum rxrpc_call_completion *_compl, u32 *_abort_code)
 397 {
 398         if (call->state != RXRPC_CALL_COMPLETE)
 399                 return -EINPROGRESS;
 400         smp_rmb();
 401         *_compl = call->completion;
 402         *_abort_code = call->abort_code;
 403         return call->error;
 404 }
 405 EXPORT_SYMBOL(rxrpc_kernel_check_call);
 406
 407 /**
 408  * rxrpc_kernel_retry_call - Allow a kernel service to retry a call
 409  * @sock: The socket the call is on
 410  * @call: The call to retry
 411  * @srx: The address of the peer to contact
 412  * @key: The security context to use (defaults to socket setting)
 413  *
 414  * Allow a kernel service to try resending a client call that failed due to a
 415  * network error to a new address.  The Tx queue is maintained intact, thereby
 416  * relieving the need to re-encrypt any request data that has already been
 417  * buffered.
 418  */
 419 int rxrpc_kernel_retry_call(struct socket *sock, struct rxrpc_call *call,
 420                             struct sockaddr_rxrpc *srx, struct key *key)
 421 {
 422         struct rxrpc_conn_parameters cp;
 423         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 424         int ret;
 425
 426         _enter("%d{%d}", call->debug_id, atomic_read(&call->usage));
 427
 428         if (!key)
 429                 key = rx->key;
 430         if (key && !key->payload.data[0])
 431                 key = NULL; /* a no-security key */
 432
 433         memset(&cp, 0, sizeof(cp));
 434         cp.local                = rx->local;
 435         cp.key                  = key;
 436         cp.security_level       = 0;
 437         cp.exclusive            = false;
 438         cp.service_id           = srx->srx_service;
 439
 440         mutex_lock(&call->user_mutex);
 441
 442         ret = rxrpc_prepare_call_for_retry(rx, call);
 443         if (ret == 0)
 444                 ret = rxrpc_retry_client_call(rx, call, &cp, srx, GFP_KERNEL);
 445
 446         mutex_unlock(&call->user_mutex);
 447         _leave(" = %d", ret);
 448         return ret;
 449 }
 450 EXPORT_SYMBOL(rxrpc_kernel_retry_call);
 451
 452 /**
 453  * rxrpc_kernel_new_call_notification - Get notifications of new calls
 454  * @sock: The socket to intercept received messages on
 455  * @notify_new_call: Function to be called when new calls appear
 456  * @discard_new_call: Function to discard preallocated calls
 457  *
 458  * Allow a kernel service to be given notifications about new calls.
 459  */
 460 void rxrpc_kernel_new_call_notification(
 461         struct socket *sock,
 462         rxrpc_notify_new_call_t notify_new_call,
 463         rxrpc_discard_new_call_t discard_new_call)
 464 {
 465         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 466
 467         rx->notify_new_call = notify_new_call;
 468         rx->discard_new_call = discard_new_call;
 469 }
 470 EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
 471
 472 /*
 473  * connect an RxRPC socket
 474  * - this just targets it at a specific destination; no actual connection
 475  *   negotiation takes place
 476  */
 477 static int rxrpc_connect(struct socket *sock, struct sockaddr *addr,
 478                          int addr_len, int flags)
 479 {
 480         struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr;
 481         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 482         int ret;
 483
 484         _enter("%p,%p,%d,%d", rx, addr, addr_len, flags);
 485
 486         ret = rxrpc_validate_address(rx, srx, addr_len);
 487         if (ret < 0) {
 488                 _leave(" = %d [bad addr]", ret);
 489                 return ret;
 490         }
 491
 492         lock_sock(&rx->sk);
 493
 494         ret = -EISCONN;
 495         if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags))
 496                 goto error;
 497
 498         switch (rx->sk.sk_state) {
 499         case RXRPC_UNBOUND:
 500                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 501         case RXRPC_CLIENT_UNBOUND:
 502         case RXRPC_CLIENT_BOUND:
 503                 break;
 504         default:
 505                 ret = -EBUSY;
 506                 goto error;
 507         }
 508
 509         rx->connect_srx = *srx;
 510         set_bit(RXRPC_SOCK_CONNECTED, &rx->flags);
 511         ret = 0;
 512
 513 error:
 514         release_sock(&rx->sk);
 515         return ret;
 516 }
 517
 518 /*
 519  * send a message through an RxRPC socket
 520  * - in a client this does a number of things:
 521  *   - finds/sets up a connection for the security specified (if any)
 522  *   - initiates a call (ID in control data)
 523  *   - ends the request phase of a call (if MSG_MORE is not set)
 524  *   - sends a call data packet
 525  *   - may send an abort (abort code in control data)
 526  */
 527 static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
 528 {
 529         struct rxrpc_local *local;
 530         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 531         int ret;
 532
 533         _enter(",{%d},,%zu", rx->sk.sk_state, len);
 534
 535         if (m->msg_flags & MSG_OOB)
 536                 return -EOPNOTSUPP;
 537
 538         if (m->msg_name) {
 539                 ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen);
 540                 if (ret < 0) {
 541                         _leave(" = %d [bad addr]", ret);
 542                         return ret;
 543                 }
 544         }
 545
 546         lock_sock(&rx->sk);
 547
 548         switch (rx->sk.sk_state) {
 549         case RXRPC_UNBOUND:
 550                 rx->srx.srx_family = AF_RXRPC;
 551                 rx->srx.srx_service = 0;
 552                 rx->srx.transport_type = SOCK_DGRAM;
 553                 rx->srx.transport.family = rx->family;
 554                 switch (rx->family) {
 555                 case AF_INET:
 556                         rx->srx.transport_len = sizeof(struct sockaddr_in);
 557                         break;
 558 #ifdef CONFIG_AF_RXRPC_IPV6
 559                 case AF_INET6:
 560                         rx->srx.transport_len = sizeof(struct sockaddr_in6);
 561                         break;
 562 #endif
 563                 default:
 564                         ret = -EAFNOSUPPORT;
 565                         goto error_unlock;
 566                 }
 567                 local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx);
 568                 if (IS_ERR(local)) {
 569                         ret = PTR_ERR(local);
 570                         goto error_unlock;
 571                 }
 572
 573                 rx->local = local;
 574                 rx->sk.sk_state = RXRPC_CLIENT_UNBOUND;
 575                 /* Fall through */
 576
 577         case RXRPC_CLIENT_UNBOUND:
 578         case RXRPC_CLIENT_BOUND:
 579                 if (!m->msg_name &&
 580                     test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) {
 581                         m->msg_name = &rx->connect_srx;
 582                         m->msg_namelen = sizeof(rx->connect_srx);
 583                 }
 584                 /* Fall through */
 585         case RXRPC_SERVER_BOUND:
 586         case RXRPC_SERVER_LISTENING:
 587                 ret = rxrpc_do_sendmsg(rx, m, len);
 588                 /* The socket has been unlocked */
 589                 goto out;
 590         default:
 591                 ret = -EINVAL;
 592                 goto error_unlock;
 593         }
 594
 595 error_unlock:
 596         release_sock(&rx->sk);
 597 out:
 598         _leave(" = %d", ret);
 599         return ret;
 600 }
 601
 602 /*
 603  * set RxRPC socket options
 604  */
 605 static int rxrpc_setsockopt(struct socket *sock, int level, int optname,
 606                             char __user *optval, unsigned int optlen)
 607 {
 608         struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
 609         unsigned int min_sec_level;
 610         u16 service_upgrade[2];
 611         int ret;
 612
 613         _enter(",%d,%d,,%d", level, optname, optlen);
 614
 615         lock_sock(&rx->sk);
 616         ret = -EOPNOTSUPP;
 617
 618         if (level == SOL_RXRPC) {
 619                 switch (optname) {
 620                 case RXRPC_EXCLUSIVE_CONNECTION:
 621                         ret = -EINVAL;
 622                         if (optlen != 0)
 623                                 goto error;
 624                         ret = -EISCONN;
 625                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 626                                 goto error;
 627                         rx->exclusive = true;
 628                         goto success;
 629
 630                 case RXRPC_SECURITY_KEY:
 631                         ret = -EINVAL;
 632                         if (rx->key)
 633                                 goto error;
 634                         ret = -EISCONN;
 635                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 636                                 goto error;
 637                         ret = rxrpc_request_key(rx, optval, optlen);
 638                         goto error;
 639
 640                 case RXRPC_SECURITY_KEYRING:
 641                         ret = -EINVAL;
 642                         if (rx->key)
 643                                 goto error;
 644                         ret = -EISCONN;
 645                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 646                                 goto error;
 647                         ret = rxrpc_server_keyring(rx, optval, optlen);
 648                         goto error;
 649
 650                 case RXRPC_MIN_SECURITY_LEVEL:
 651                         ret = -EINVAL;
 652                         if (optlen != sizeof(unsigned int))
 653                                 goto error;
 654                         ret = -EISCONN;
 655                         if (rx->sk.sk_state != RXRPC_UNBOUND)
 656                                 goto error;
 657                         ret = get_user(min_sec_level,
 658                                        (unsigned int __user *) optval);
 659                         if (ret < 0)
 660                                 goto error;
 661                         ret = -EINVAL;
 662                         if (min_sec_level > RXRPC_SECURITY_MAX)
 663                                 goto error;
 664                         rx->min_sec_level = min_sec_level;
 665                         goto success;
 666
 667                 case RXRPC_UPGRADEABLE_SERVICE:
 668                         ret = -EINVAL;
 669                         if (optlen != sizeof(service_upgrade) ||
 670                             rx->service_upgrade.from != 0)
 671                                 goto error;
 672                         ret = -EISCONN;
 673                         if (rx->sk.sk_state != RXRPC_SERVER_BOUND2)
 674                                 goto error;
 675                         ret = -EFAULT;
 676                         if (copy_from_user(service_upgrade, optval,
 677                                            sizeof(service_upgrade)) != 0)
 678                                 goto error;
 679                         ret = -EINVAL;
 680                         if ((service_upgrade[0] != rx->srx.srx_service ||
 681                              service_upgrade[1] != rx->second_service) &&
 682                             (service_upgrade[0] != rx->second_service ||
 683                              service_upgrade[1] != rx->srx.srx_service))
 684                                 goto error;
 685                         rx->service_upgrade.from = service_upgrade[0];
 686                         rx->service_upgrade.to = service_upgrade[1];
 687                         goto success;
 688
 689                 default:
 690                         break;
 691                 }
 692         }
 693
 694 success:
 695         ret = 0;
 696 error:
 697         release_sock(&rx->sk);
 698         return ret;
 699 }
 700
 701 /*
 702  * Get socket options.
 703  */
 704 static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
 705                             char __user *optval, int __user *_optlen)
 706 {
 707         int optlen;
 708
 709         if (level != SOL_RXRPC)
 710                 return -EOPNOTSUPP;
 711
 712         if (get_user(optlen, _optlen))
 713                 return -EFAULT;
 714
 715         switch (optname) {
 716         case RXRPC_SUPPORTED_CMSG:
 717                 if (optlen < sizeof(int))
 718                         return -ETOOSMALL;
 719                 if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
 720                     put_user(sizeof(int), _optlen))
 721                         return -EFAULT;
 722                 return 0;
 723
 724         default:
 725                 return -EOPNOTSUPP;
 726         }
 727 }
 728
 729 /*
 730  * permit an RxRPC socket to be polled
 731  */
 732 static __poll_t rxrpc_poll(struct file *file, struct socket *sock,
 733                                poll_table *wait)
 734 {
 735         struct sock *sk = sock->sk;
 736         struct rxrpc_sock *rx = rxrpc_sk(sk);
 737         __poll_t mask;
 738
 739         sock_poll_wait(file, sk_sleep(sk), wait);
 740         mask = 0;
 741
 742         /* the socket is readable if there are any messages waiting on the Rx
 743          * queue */
 744         if (!list_empty(&rx->recvmsg_q))
 745                 mask |= EPOLLIN | EPOLLRDNORM;
 746
 747         /* the socket is writable if there is space to add new data to the
 748          * socket; there is no guarantee that any particular call in progress
 749          * on the socket may have space in the Tx ACK window */
 750         if (rxrpc_writable(sk))
 751                 mask |= EPOLLOUT | EPOLLWRNORM;
 752
 753         return mask;
 754 }
 755
 756 /*
 757  * create an RxRPC socket
 758  */
 759 static int rxrpc_create(struct net *net, struct socket *sock, int protocol,
 760                         int kern)
 761 {
 762         struct rxrpc_sock *rx;
 763         struct sock *sk;
 764
 765         _enter("%p,%d", sock, protocol);
 766
 767         /* we support transport protocol UDP/UDP6 only */
 768         if (protocol != PF_INET &&
 769             IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6)
 770                 return -EPROTONOSUPPORT;
 771
 772         if (sock->type != SOCK_DGRAM)
 773                 return -ESOCKTNOSUPPORT;
 774
 775         sock->ops = &rxrpc_rpc_ops;
 776         sock->state = SS_UNCONNECTED;
 777
 778         sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern);
 779         if (!sk)
 780                 return -ENOMEM;
 781
 782         sock_init_data(sock, sk);
 783         sock_set_flag(sk, SOCK_RCU_FREE);
 784         sk->sk_state            = RXRPC_UNBOUND;
 785         sk->sk_write_space      = rxrpc_write_space;
 786         sk->sk_max_ack_backlog  = 0;
 787         sk->sk_destruct         = rxrpc_sock_destructor;
 788
 789         rx = rxrpc_sk(sk);
 790         rx->family = protocol;
 791         rx->calls = RB_ROOT;
 792
 793         spin_lock_init(&rx->incoming_lock);
 794         INIT_LIST_HEAD(&rx->sock_calls);
 795         INIT_LIST_HEAD(&rx->to_be_accepted);
 796         INIT_LIST_HEAD(&rx->recvmsg_q);
 797         rwlock_init(&rx->recvmsg_lock);
 798         rwlock_init(&rx->call_lock);
 799         memset(&rx->srx, 0, sizeof(rx->srx));
 800
 801         _leave(" = 0 [%p]", rx);
 802         return 0;
 803 }
 804
 805 /*
 806  * Kill all the calls on a socket and shut it down.
 807  */
 808 static int rxrpc_shutdown(struct socket *sock, int flags)
 809 {
 810         struct sock *sk = sock->sk;
 811         struct rxrpc_sock *rx = rxrpc_sk(sk);
 812         int ret = 0;
 813
 814         _enter("%p,%d", sk, flags);
 815
 816         if (flags != SHUT_RDWR)
 817                 return -EOPNOTSUPP;
 818         if (sk->sk_state == RXRPC_CLOSE)
 819                 return -ESHUTDOWN;
 820
 821         lock_sock(sk);
 822
 823         spin_lock_bh(&sk->sk_receive_queue.lock);
 824         if (sk->sk_state < RXRPC_CLOSE) {
 825                 sk->sk_state = RXRPC_CLOSE;
 826                 sk->sk_shutdown = SHUTDOWN_MASK;
 827         } else {
 828                 ret = -ESHUTDOWN;
 829         }
 830         spin_unlock_bh(&sk->sk_receive_queue.lock);
 831
 832         rxrpc_discard_prealloc(rx);
 833
 834         release_sock(sk);
 835         return ret;
 836 }
 837
 838 /*
 839  * RxRPC socket destructor
 840  */
 841 static void rxrpc_sock_destructor(struct sock *sk)
 842 {
 843         _enter("%p", sk);
 844
 845         rxrpc_purge_queue(&sk->sk_receive_queue);
 846
 847         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 848         WARN_ON(!sk_unhashed(sk));
 849         WARN_ON(sk->sk_socket);
 850
 851         if (!sock_flag(sk, SOCK_DEAD)) {
 852                 printk("Attempt to release alive rxrpc socket: %p\n", sk);
 853                 return;
 854         }
 855 }
 856
 857 /*
 858  * release an RxRPC socket
 859  */
 860 static int rxrpc_release_sock(struct sock *sk)
 861 {
 862         struct rxrpc_sock *rx = rxrpc_sk(sk);
 863         struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
 864
 865         _enter("%p{%d,%d}", sk, sk->sk_state, refcount_read(&sk->sk_refcnt));
 866
 867         /* declare the socket closed for business */
 868         sock_orphan(sk);
 869         sk->sk_shutdown = SHUTDOWN_MASK;
 870
 871         /* We want to kill off all connections from a service socket
 872          * as fast as possible because we can't share these; client
 873          * sockets, on the other hand, can share an endpoint.
 874          */
 875         switch (sk->sk_state) {
 876         case RXRPC_SERVER_BOUND:
 877         case RXRPC_SERVER_BOUND2:
 878         case RXRPC_SERVER_LISTENING:
 879         case RXRPC_SERVER_LISTEN_DISABLED:
 880                 rx->local->service_closed = true;
 881                 break;
 882         }
 883
 884         spin_lock_bh(&sk->sk_receive_queue.lock);
 885         sk->sk_state = RXRPC_CLOSE;
 886         spin_unlock_bh(&sk->sk_receive_queue.lock);
 887
 888         if (rx->local && rcu_access_pointer(rx->local->service) == rx) {
 889                 write_lock(&rx->local->services_lock);
 890                 rcu_assign_pointer(rx->local->service, NULL);
 891                 write_unlock(&rx->local->services_lock);
 892         }
 893
 894         /* try to flush out this socket */
 895         rxrpc_discard_prealloc(rx);
 896         rxrpc_release_calls_on_socket(rx);
 897         flush_workqueue(rxrpc_workqueue);
 898         rxrpc_purge_queue(&sk->sk_receive_queue);
 899         rxrpc_queue_work(&rxnet->service_conn_reaper);
 900         rxrpc_queue_work(&rxnet->client_conn_reaper);
 901
 902         rxrpc_put_local(rx->local);
 903         rx->local = NULL;
 904         key_put(rx->key);
 905         rx->key = NULL;
 906         key_put(rx->securities);
 907         rx->securities = NULL;
 908         sock_put(sk);
 909
 910         _leave(" = 0");
 911         return 0;
 912 }
 913
 914 /*
 915  * release an RxRPC BSD socket on close() or equivalent
 916  */
 917 static int rxrpc_release(struct socket *sock)
 918 {
 919         struct sock *sk = sock->sk;
 920
 921         _enter("%p{%p}", sock, sk);
 922
 923         if (!sk)
 924                 return 0;
 925
 926         sock->sk = NULL;
 927
 928         return rxrpc_release_sock(sk);
 929 }
 930
 931 /*
 932  * RxRPC network protocol
 933  */
 934 static const struct proto_ops rxrpc_rpc_ops = {
 935         .family         = PF_RXRPC,
 936         .owner          = THIS_MODULE,
 937         .release        = rxrpc_release,
 938         .bind           = rxrpc_bind,
 939         .connect        = rxrpc_connect,
 940         .socketpair     = sock_no_socketpair,
 941         .accept         = sock_no_accept,
 942         .getname        = sock_no_getname,
 943         .poll           = rxrpc_poll,
 944         .ioctl          = sock_no_ioctl,
 945         .listen         = rxrpc_listen,
 946         .shutdown       = rxrpc_shutdown,
 947         .setsockopt     = rxrpc_setsockopt,
 948         .getsockopt     = rxrpc_getsockopt,
 949         .sendmsg        = rxrpc_sendmsg,
 950         .recvmsg        = rxrpc_recvmsg,
 951         .mmap           = sock_no_mmap,
 952         .sendpage       = sock_no_sendpage,
 953 };
 954
 955 static struct proto rxrpc_proto = {
 956         .name           = "RXRPC",
 957         .owner          = THIS_MODULE,
 958         .obj_size       = sizeof(struct rxrpc_sock),
 959         .max_header     = sizeof(struct rxrpc_wire_header),
 960 };
 961
 962 static const struct net_proto_family rxrpc_family_ops = {
 963         .family = PF_RXRPC,
 964         .create = rxrpc_create,
 965         .owner  = THIS_MODULE,
 966 };
 967
 968 /*
 969  * initialise and register the RxRPC protocol
 970  */
 971 static int __init af_rxrpc_init(void)
 972 {
 973         int ret = -1;
 974         unsigned int tmp;
 975
 976         BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
 977
 978         get_random_bytes(&tmp, sizeof(tmp));
 979         tmp &= 0x3fffffff;
 980         if (tmp == 0)
 981                 tmp = 1;
 982         idr_set_cursor(&rxrpc_client_conn_ids, tmp);
 983
 984         ret = -ENOMEM;
 985         rxrpc_call_jar = kmem_cache_create(
 986                 "rxrpc_call_jar", sizeof(struct rxrpc_call), 0,
 987                 SLAB_HWCACHE_ALIGN, NULL);
 988         if (!rxrpc_call_jar) {
 989                 pr_notice("Failed to allocate call jar\n");
 990                 goto error_call_jar;
 991         }
 992
 993         rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1);
 994         if (!rxrpc_workqueue) {
 995                 pr_notice("Failed to allocate work queue\n");
 996                 goto error_work_queue;
 997         }
 998
 999         ret = rxrpc_init_security();
1000         if (ret < 0) {
1001                 pr_crit("Cannot initialise security\n");
1002                 goto error_security;
1003         }
1004
1005         ret = register_pernet_subsys(&rxrpc_net_ops);
1006         if (ret)
1007                 goto error_pernet;
1008
1009         ret = proto_register(&rxrpc_proto, 1);
1010         if (ret < 0) {
1011                 pr_crit("Cannot register protocol\n");
1012                 goto error_proto;
1013         }
1014
1015         ret = sock_register(&rxrpc_family_ops);
1016         if (ret < 0) {
1017                 pr_crit("Cannot register socket family\n");
1018                 goto error_sock;
1019         }
1020
1021         ret = register_key_type(&key_type_rxrpc);
1022         if (ret < 0) {
1023                 pr_crit("Cannot register client key type\n");
1024                 goto error_key_type;
1025         }
1026
1027         ret = register_key_type(&key_type_rxrpc_s);
1028         if (ret < 0) {
1029                 pr_crit("Cannot register server key type\n");
1030                 goto error_key_type_s;
1031         }
1032
1033         ret = rxrpc_sysctl_init();
1034         if (ret < 0) {
1035                 pr_crit("Cannot register sysctls\n");
1036                 goto error_sysctls;
1037         }
1038
1039         return 0;
1040
1041 error_sysctls:
1042         unregister_key_type(&key_type_rxrpc_s);
1043 error_key_type_s:
1044         unregister_key_type(&key_type_rxrpc);
1045 error_key_type:
1046         sock_unregister(PF_RXRPC);
1047 error_sock:
1048         proto_unregister(&rxrpc_proto);
1049 error_proto:
1050         unregister_pernet_subsys(&rxrpc_net_ops);
1051 error_pernet:
1052         rxrpc_exit_security();
1053 error_security:
1054         destroy_workqueue(rxrpc_workqueue);
1055 error_work_queue:
1056         kmem_cache_destroy(rxrpc_call_jar);
1057 error_call_jar:
1058         return ret;
1059 }
1060
1061 /*
1062  * unregister the RxRPC protocol
1063  */
1064 static void __exit af_rxrpc_exit(void)
1065 {
1066         _enter("");
1067         rxrpc_sysctl_exit();
1068         unregister_key_type(&key_type_rxrpc_s);
1069         unregister_key_type(&key_type_rxrpc);
1070         sock_unregister(PF_RXRPC);
1071         proto_unregister(&rxrpc_proto);
1072         unregister_pernet_subsys(&rxrpc_net_ops);
1073         ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0);
1074         ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0);
1075
1076         /* Make sure the local and peer records pinned by any dying connections
1077          * are released.
1078          */
1079         rcu_barrier();
1080         rxrpc_destroy_client_conn_ids();
1081
1082         destroy_workqueue(rxrpc_workqueue);
1083         rxrpc_exit_security();
1084         kmem_cache_destroy(rxrpc_call_jar);
1085         _leave("");
1086 }
1087
1088 module_init(af_rxrpc_init);
1089 module_exit(af_rxrpc_exit);