net/x25/af_x25.c

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/config.h>
  39 #include <linux/module.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/timer.h>
  44 #include <linux/string.h>
  45 #include <linux/net.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <net/sock.h>
  50 #include <net/tcp.h>
  51 #include <asm/uaccess.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  54 #include <linux/notifier.h>
  55 #include <linux/init.h>
  56 #include <net/x25.h>
  57
  58 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  59 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  60 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  61 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  62 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  63
  64 HLIST_HEAD(x25_list);
  65 DEFINE_RWLOCK(x25_list_lock);
  66
  67 static struct proto_ops x25_proto_ops;
  68
  69 static struct x25_address null_x25_address = {"               "};
  70
  71 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  72                   struct x25_address *calling_addr)
  73 {
  74         int called_len, calling_len;
  75         char *called, *calling;
  76         int i;
  77
  78         called_len  = (*p >> 0) & 0x0F;
  79         calling_len = (*p >> 4) & 0x0F;
  80
  81         called  = called_addr->x25_addr;
  82         calling = calling_addr->x25_addr;
  83         p++;
  84
  85         for (i = 0; i < (called_len + calling_len); i++) {
  86                 if (i < called_len) {
  87                         if (i % 2 != 0) {
  88                                 *called++ = ((*p >> 0) & 0x0F) + '0';
  89                                 p++;
  90                         } else {
  91                                 *called++ = ((*p >> 4) & 0x0F) + '0';
  92                         }
  93                 } else {
  94                         if (i % 2 != 0) {
  95                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
  96                                 p++;
  97                         } else {
  98                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
  99                         }
 100                 }
 101         }
 102
 103         *called = *calling = '\0';
 104
 105         return 1 + (called_len + calling_len + 1) / 2;
 106 }
 107
 108 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 109                   struct x25_address *calling_addr)
 110 {
 111         unsigned int called_len, calling_len;
 112         char *called, *calling;
 113         int i;
 114
 115         called  = called_addr->x25_addr;
 116         calling = calling_addr->x25_addr;
 117
 118         called_len  = strlen(called);
 119         calling_len = strlen(calling);
 120
 121         *p++ = (calling_len << 4) | (called_len << 0);
 122
 123         for (i = 0; i < (called_len + calling_len); i++) {
 124                 if (i < called_len) {
 125                         if (i % 2 != 0) {
 126                                 *p |= (*called++ - '0') << 0;
 127                                 p++;
 128                         } else {
 129                                 *p = 0x00;
 130                                 *p |= (*called++ - '0') << 4;
 131                         }
 132                 } else {
 133                         if (i % 2 != 0) {
 134                                 *p |= (*calling++ - '0') << 0;
 135                                 p++;
 136                         } else {
 137                                 *p = 0x00;
 138                                 *p |= (*calling++ - '0') << 4;
 139                         }
 140                 }
 141         }
 142
 143         return 1 + (called_len + calling_len + 1) / 2;
 144 }
 145
 146 /*
 147  *      Socket removal during an interrupt is now safe.
 148  */
 149 static void x25_remove_socket(struct sock *sk)
 150 {
 151         write_lock_bh(&x25_list_lock);
 152         sk_del_node_init(sk);
 153         write_unlock_bh(&x25_list_lock);
 154 }
 155
 156 /*
 157  *      Kill all bound sockets on a dropped device.
 158  */
 159 static void x25_kill_by_device(struct net_device *dev)
 160 {
 161         struct sock *s;
 162         struct hlist_node *node;
 163
 164         write_lock_bh(&x25_list_lock);
 165
 166         sk_for_each(s, node, &x25_list)
 167                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 168                         x25_disconnect(s, ENETUNREACH, 0, 0);
 169
 170         write_unlock_bh(&x25_list_lock);
 171 }
 172
 173 /*
 174  *      Handle device status changes.
 175  */
 176 static int x25_device_event(struct notifier_block *this, unsigned long event,
 177                             void *ptr)
 178 {
 179         struct net_device *dev = ptr;
 180         struct x25_neigh *nb;
 181
 182         if (dev->type == ARPHRD_X25
 183 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 184          || dev->type == ARPHRD_ETHER
 185 #endif
 186          ) {
 187                 switch (event) {
 188                         case NETDEV_UP:
 189                                 x25_link_device_up(dev);
 190                                 break;
 191                         case NETDEV_GOING_DOWN:
 192                                 nb = x25_get_neigh(dev);
 193                                 if (nb) {
 194                                         x25_terminate_link(nb);
 195                                         x25_neigh_put(nb);
 196                                 }
 197                                 break;
 198                         case NETDEV_DOWN:
 199                                 x25_kill_by_device(dev);
 200                                 x25_route_device_down(dev);
 201                                 x25_link_device_down(dev);
 202                                 break;
 203                 }
 204         }
 205
 206         return NOTIFY_DONE;
 207 }
 208
 209 /*
 210  *      Add a socket to the bound sockets list.
 211  */
 212 static void x25_insert_socket(struct sock *sk)
 213 {
 214         write_lock_bh(&x25_list_lock);
 215         sk_add_node(sk, &x25_list);
 216         write_unlock_bh(&x25_list_lock);
 217 }
 218
 219 /*
 220  *      Find a socket that wants to accept the Call Request we just
 221  *      received. Check the full list for an address/cud match.
 222  *      If no cuds match return the next_best thing, an address match.
 223  *      Note: if a listening socket has cud set it must only get calls
 224  *      with matching cud.
 225  */
 226 static struct sock *x25_find_listener(struct x25_address *addr,
 227                                         struct sk_buff *skb)
 228 {
 229         struct sock *s;
 230         struct sock *next_best;
 231         struct hlist_node *node;
 232
 233         read_lock_bh(&x25_list_lock);
 234         next_best = NULL;
 235
 236         sk_for_each(s, node, &x25_list)
 237                 if ((!strcmp(addr->x25_addr,
 238                         x25_sk(s)->source_addr.x25_addr) ||
 239                                 !strcmp(addr->x25_addr,
 240                                         null_x25_address.x25_addr)) &&
 241                                         s->sk_state == TCP_LISTEN) {
 242                         /*
 243                          * Found a listening socket, now check the incoming
 244                          * call user data vs this sockets call user data
 245                          */
 246                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 247                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 248                                         skb->data,
 249                                         x25_sk(s)->cudmatchlength)) == 0) {
 250                                         sock_hold(s);
 251                                         goto found;
 252                                  }
 253                         } else
 254                                 next_best = s;
 255                 }
 256         if (next_best) {
 257                 s = next_best;
 258                 sock_hold(s);
 259                 goto found;
 260         }
 261         s = NULL;
 262 found:
 263         read_unlock_bh(&x25_list_lock);
 264         return s;
 265 }
 266
 267 /*
 268  *      Find a connected X.25 socket given my LCI and neighbour.
 269  */
 270 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 271 {
 272         struct sock *s;
 273         struct hlist_node *node;
 274
 275         sk_for_each(s, node, &x25_list)
 276                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 277                         sock_hold(s);
 278                         goto found;
 279                 }
 280         s = NULL;
 281 found:
 282         return s;
 283 }
 284
 285 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 286 {
 287         struct sock *s;
 288
 289         read_lock_bh(&x25_list_lock);
 290         s = __x25_find_socket(lci, nb);
 291         read_unlock_bh(&x25_list_lock);
 292         return s;
 293 }
 294
 295 /*
 296  *      Find a unique LCI for a given device.
 297  */
 298 static unsigned int x25_new_lci(struct x25_neigh *nb)
 299 {
 300         unsigned int lci = 1;
 301         struct sock *sk;
 302
 303         read_lock_bh(&x25_list_lock);
 304
 305         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 306                 sock_put(sk);
 307                 if (++lci == 4096) {
 308                         lci = 0;
 309                         break;
 310                 }
 311         }
 312
 313         read_unlock_bh(&x25_list_lock);
 314         return lci;
 315 }
 316
 317 /*
 318  *      Deferred destroy.
 319  */
 320 void x25_destroy_socket(struct sock *);
 321
 322 /*
 323  *      handler for deferred kills.
 324  */
 325 static void x25_destroy_timer(unsigned long data)
 326 {
 327         x25_destroy_socket((struct sock *)data);
 328 }
 329
 330 /*
 331  *      This is called from user mode and the timers. Thus it protects itself
 332  *      against interrupt users but doesn't worry about being called during
 333  *      work. Once it is removed from the queue no interrupt or bottom half
 334  *      will touch it and we are (fairly 8-) ) safe.
 335  *      Not static as it's used by the timer
 336  */
 337 void x25_destroy_socket(struct sock *sk)
 338 {
 339         struct sk_buff *skb;
 340
 341         sock_hold(sk);
 342         lock_sock(sk);
 343         x25_stop_heartbeat(sk);
 344         x25_stop_timer(sk);
 345
 346         x25_remove_socket(sk);
 347         x25_clear_queues(sk);           /* Flush the queues */
 348
 349         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 350                 if (skb->sk != sk) {            /* A pending connection */
 351                         /*
 352                          * Queue the unaccepted socket for death
 353                          */
 354                         sock_set_flag(skb->sk, SOCK_DEAD);
 355                         x25_start_heartbeat(skb->sk);
 356                         x25_sk(skb->sk)->state = X25_STATE_0;
 357                 }
 358
 359                 kfree_skb(skb);
 360         }
 361
 362         if (atomic_read(&sk->sk_wmem_alloc) ||
 363             atomic_read(&sk->sk_rmem_alloc)) {
 364                 /* Defer: outstanding buffers */
 365                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 366                 sk->sk_timer.function = x25_destroy_timer;
 367                 sk->sk_timer.data = (unsigned long)sk;
 368                 add_timer(&sk->sk_timer);
 369         } else {
 370                 /* drop last reference so sock_put will free */
 371                 __sock_put(sk);
 372         }
 373
 374         release_sock(sk);
 375         sock_put(sk);
 376 }
 377
 378 /*
 379  *      Handling for system calls applied via the various interfaces to a
 380  *      X.25 socket object.
 381  */
 382
 383 static int x25_setsockopt(struct socket *sock, int level, int optname,
 384                           char __user *optval, int optlen)
 385 {
 386         int opt;
 387         struct sock *sk = sock->sk;
 388         int rc = -ENOPROTOOPT;
 389
 390         if (level != SOL_X25 || optname != X25_QBITINCL)
 391                 goto out;
 392
 393         rc = -EINVAL;
 394         if (optlen < sizeof(int))
 395                 goto out;
 396
 397         rc = -EFAULT;
 398         if (get_user(opt, (int __user *)optval))
 399                 goto out;
 400
 401         x25_sk(sk)->qbitincl = !!opt;
 402         rc = 0;
 403 out:
 404         return rc;
 405 }
 406
 407 static int x25_getsockopt(struct socket *sock, int level, int optname,
 408                           char __user *optval, int __user *optlen)
 409 {
 410         struct sock *sk = sock->sk;
 411         int val, len, rc = -ENOPROTOOPT;
 412
 413         if (level != SOL_X25 || optname != X25_QBITINCL)
 414                 goto out;
 415
 416         rc = -EFAULT;
 417         if (get_user(len, optlen))
 418                 goto out;
 419
 420         len = min_t(unsigned int, len, sizeof(int));
 421
 422         rc = -EINVAL;
 423         if (len < 0)
 424                 goto out;
 425
 426         rc = -EFAULT;
 427         if (put_user(len, optlen))
 428                 goto out;
 429
 430         val = x25_sk(sk)->qbitincl;
 431         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 432 out:
 433         return rc;
 434 }
 435
 436 static int x25_listen(struct socket *sock, int backlog)
 437 {
 438         struct sock *sk = sock->sk;
 439         int rc = -EOPNOTSUPP;
 440
 441         if (sk->sk_state != TCP_LISTEN) {
 442                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 443                 sk->sk_max_ack_backlog = backlog;
 444                 sk->sk_state           = TCP_LISTEN;
 445                 rc = 0;
 446         }
 447
 448         return rc;
 449 }
 450
 451 static struct proto x25_proto = {
 452         .name     = "X25",
 453         .owner    = THIS_MODULE,
 454         .obj_size = sizeof(struct x25_sock),
 455 };
 456
 457 static struct sock *x25_alloc_socket(void)
 458 {
 459         struct x25_sock *x25;
 460         struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
 461
 462         if (!sk)
 463                 goto out;
 464
 465         sock_init_data(NULL, sk);
 466
 467         x25 = x25_sk(sk);
 468         skb_queue_head_init(&x25->ack_queue);
 469         skb_queue_head_init(&x25->fragment_queue);
 470         skb_queue_head_init(&x25->interrupt_in_queue);
 471         skb_queue_head_init(&x25->interrupt_out_queue);
 472 out:
 473         return sk;
 474 }
 475
 476 void x25_init_timers(struct sock *sk);
 477
 478 static int x25_create(struct socket *sock, int protocol)
 479 {
 480         struct sock *sk;
 481         struct x25_sock *x25;
 482         int rc = -ESOCKTNOSUPPORT;
 483
 484         if (sock->type != SOCK_SEQPACKET || protocol)
 485                 goto out;
 486
 487         rc = -ENOMEM;
 488         if ((sk = x25_alloc_socket()) == NULL)
 489                 goto out;
 490
 491         x25 = x25_sk(sk);
 492
 493         sock_init_data(sock, sk);
 494
 495         x25_init_timers(sk);
 496
 497         sock->ops    = &x25_proto_ops;
 498         sk->sk_protocol = protocol;
 499         sk->sk_backlog_rcv = x25_backlog_rcv;
 500
 501         x25->t21   = sysctl_x25_call_request_timeout;
 502         x25->t22   = sysctl_x25_reset_request_timeout;
 503         x25->t23   = sysctl_x25_clear_request_timeout;
 504         x25->t2    = sysctl_x25_ack_holdback_timeout;
 505         x25->state = X25_STATE_0;
 506         x25->cudmatchlength = 0;
 507         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 508                                                         /* on call accept   */
 509
 510         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 511         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 512         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 513         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 514         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 515         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 516         rc = 0;
 517 out:
 518         return rc;
 519 }
 520
 521 static struct sock *x25_make_new(struct sock *osk)
 522 {
 523         struct sock *sk = NULL;
 524         struct x25_sock *x25, *ox25;
 525
 526         if (osk->sk_type != SOCK_SEQPACKET)
 527                 goto out;
 528
 529         if ((sk = x25_alloc_socket()) == NULL)
 530                 goto out;
 531
 532         x25 = x25_sk(sk);
 533
 534         sk->sk_type        = osk->sk_type;
 535         sk->sk_socket      = osk->sk_socket;
 536         sk->sk_priority    = osk->sk_priority;
 537         sk->sk_protocol    = osk->sk_protocol;
 538         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 539         sk->sk_sndbuf      = osk->sk_sndbuf;
 540         sk->sk_state       = TCP_ESTABLISHED;
 541         sk->sk_sleep       = osk->sk_sleep;
 542         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 543
 544         if (sock_flag(osk, SOCK_ZAPPED))
 545                 sock_set_flag(sk, SOCK_ZAPPED);
 546
 547         if (sock_flag(osk, SOCK_DBG))
 548                 sock_set_flag(sk, SOCK_DBG);
 549
 550         ox25 = x25_sk(osk);
 551         x25->t21        = ox25->t21;
 552         x25->t22        = ox25->t22;
 553         x25->t23        = ox25->t23;
 554         x25->t2         = ox25->t2;
 555         x25->facilities = ox25->facilities;
 556         x25->qbitincl   = ox25->qbitincl;
 557         x25->cudmatchlength = ox25->cudmatchlength;
 558         x25->accptapprv = ox25->accptapprv;
 559
 560         x25_init_timers(sk);
 561 out:
 562         return sk;
 563 }
 564
 565 static int x25_release(struct socket *sock)
 566 {
 567         struct sock *sk = sock->sk;
 568         struct x25_sock *x25;
 569
 570         if (!sk)
 571                 goto out;
 572
 573         x25 = x25_sk(sk);
 574
 575         switch (x25->state) {
 576
 577                 case X25_STATE_0:
 578                 case X25_STATE_2:
 579                         x25_disconnect(sk, 0, 0, 0);
 580                         x25_destroy_socket(sk);
 581                         goto out;
 582
 583                 case X25_STATE_1:
 584                 case X25_STATE_3:
 585                 case X25_STATE_4:
 586                         x25_clear_queues(sk);
 587                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 588                         x25_start_t23timer(sk);
 589                         x25->state = X25_STATE_2;
 590                         sk->sk_state    = TCP_CLOSE;
 591                         sk->sk_shutdown |= SEND_SHUTDOWN;
 592                         sk->sk_state_change(sk);
 593                         sock_set_flag(sk, SOCK_DEAD);
 594                         sock_set_flag(sk, SOCK_DESTROY);
 595                         break;
 596         }
 597
 598         sock->sk        = NULL;
 599         sk->sk_socket   = NULL; /* Not used, but we should do this */
 600 out:
 601         return 0;
 602 }
 603
 604 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 605 {
 606         struct sock *sk = sock->sk;
 607         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 608
 609         if (!sock_flag(sk, SOCK_ZAPPED) ||
 610             addr_len != sizeof(struct sockaddr_x25) ||
 611             addr->sx25_family != AF_X25)
 612                 return -EINVAL;
 613
 614         x25_sk(sk)->source_addr = addr->sx25_addr;
 615         x25_insert_socket(sk);
 616         sock_reset_flag(sk, SOCK_ZAPPED);
 617         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 618
 619         return 0;
 620 }
 621
 622 static int x25_wait_for_connection_establishment(struct sock *sk)
 623 {
 624         DECLARE_WAITQUEUE(wait, current);
 625         int rc;
 626
 627         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 628         for (;;) {
 629                 __set_current_state(TASK_INTERRUPTIBLE);
 630                 rc = -ERESTARTSYS;
 631                 if (signal_pending(current))
 632                         break;
 633                 rc = sock_error(sk);
 634                 if (rc) {
 635                         sk->sk_socket->state = SS_UNCONNECTED;
 636                         break;
 637                 }
 638                 rc = 0;
 639                 if (sk->sk_state != TCP_ESTABLISHED) {
 640                         release_sock(sk);
 641                         schedule();
 642                         lock_sock(sk);
 643                 } else
 644                         break;
 645         }
 646         __set_current_state(TASK_RUNNING);
 647         remove_wait_queue(sk->sk_sleep, &wait);
 648         return rc;
 649 }
 650
 651 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 652                        int addr_len, int flags)
 653 {
 654         struct sock *sk = sock->sk;
 655         struct x25_sock *x25 = x25_sk(sk);
 656         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 657         struct x25_route *rt;
 658         int rc = 0;
 659
 660         lock_sock(sk);
 661         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 662                 sock->state = SS_CONNECTED;
 663                 goto out; /* Connect completed during a ERESTARTSYS event */
 664         }
 665
 666         rc = -ECONNREFUSED;
 667         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 668                 sock->state = SS_UNCONNECTED;
 669                 goto out;
 670         }
 671
 672         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 673         if (sk->sk_state == TCP_ESTABLISHED)
 674                 goto out;
 675
 676         sk->sk_state   = TCP_CLOSE;
 677         sock->state = SS_UNCONNECTED;
 678
 679         rc = -EINVAL;
 680         if (addr_len != sizeof(struct sockaddr_x25) ||
 681             addr->sx25_family != AF_X25)
 682                 goto out;
 683
 684         rc = -ENETUNREACH;
 685         rt = x25_get_route(&addr->sx25_addr);
 686         if (!rt)
 687                 goto out;
 688
 689         x25->neighbour = x25_get_neigh(rt->dev);
 690         if (!x25->neighbour)
 691                 goto out_put_route;
 692
 693         x25_limit_facilities(&x25->facilities, x25->neighbour);
 694
 695         x25->lci = x25_new_lci(x25->neighbour);
 696         if (!x25->lci)
 697                 goto out_put_neigh;
 698
 699         rc = -EINVAL;
 700         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 701                 goto out_put_neigh;
 702
 703         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 704                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 705
 706         x25->dest_addr = addr->sx25_addr;
 707
 708         /* Move to connecting socket, start sending Connect Requests */
 709         sock->state   = SS_CONNECTING;
 710         sk->sk_state  = TCP_SYN_SENT;
 711
 712         x25->state = X25_STATE_1;
 713
 714         x25_write_internal(sk, X25_CALL_REQUEST);
 715
 716         x25_start_heartbeat(sk);
 717         x25_start_t21timer(sk);
 718
 719         /* Now the loop */
 720         rc = -EINPROGRESS;
 721         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 722                 goto out_put_neigh;
 723
 724         rc = x25_wait_for_connection_establishment(sk);
 725         if (rc)
 726                 goto out_put_neigh;
 727
 728         sock->state = SS_CONNECTED;
 729         rc = 0;
 730 out_put_neigh:
 731         if (rc)
 732                 x25_neigh_put(x25->neighbour);
 733 out_put_route:
 734         x25_route_put(rt);
 735 out:
 736         release_sock(sk);
 737         return rc;
 738 }
 739
 740 static int x25_wait_for_data(struct sock *sk, int timeout)
 741 {
 742         DECLARE_WAITQUEUE(wait, current);
 743         int rc = 0;
 744
 745         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 746         for (;;) {
 747                 __set_current_state(TASK_INTERRUPTIBLE);
 748                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 749                         break;
 750                 rc = -ERESTARTSYS;
 751                 if (signal_pending(current))
 752                         break;
 753                 rc = -EAGAIN;
 754                 if (!timeout)
 755                         break;
 756                 rc = 0;
 757                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 758                         release_sock(sk);
 759                         timeout = schedule_timeout(timeout);
 760                         lock_sock(sk);
 761                 } else
 762                         break;
 763         }
 764         __set_current_state(TASK_RUNNING);
 765         remove_wait_queue(sk->sk_sleep, &wait);
 766         return rc;
 767 }
 768
 769 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 770 {
 771         struct sock *sk = sock->sk;
 772         struct sock *newsk;
 773         struct sk_buff *skb;
 774         int rc = -EINVAL;
 775
 776         if (!sk || sk->sk_state != TCP_LISTEN)
 777                 goto out;
 778
 779         rc = -EOPNOTSUPP;
 780         if (sk->sk_type != SOCK_SEQPACKET)
 781                 goto out;
 782
 783         lock_sock(sk);
 784         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 785         if (rc)
 786                 goto out2;
 787         skb = skb_dequeue(&sk->sk_receive_queue);
 788         rc = -EINVAL;
 789         if (!skb->sk)
 790                 goto out2;
 791         newsk            = skb->sk;
 792         newsk->sk_socket = newsock;
 793         newsk->sk_sleep  = &newsock->wait;
 794
 795         /* Now attach up the new socket */
 796         skb->sk = NULL;
 797         kfree_skb(skb);
 798         sk->sk_ack_backlog--;
 799         newsock->sk    = newsk;
 800         newsock->state = SS_CONNECTED;
 801         rc = 0;
 802 out2:
 803         release_sock(sk);
 804 out:
 805         return rc;
 806 }
 807
 808 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 809                        int *uaddr_len, int peer)
 810 {
 811         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 812         struct sock *sk = sock->sk;
 813         struct x25_sock *x25 = x25_sk(sk);
 814
 815         if (peer) {
 816                 if (sk->sk_state != TCP_ESTABLISHED)
 817                         return -ENOTCONN;
 818                 sx25->sx25_addr = x25->dest_addr;
 819         } else
 820                 sx25->sx25_addr = x25->source_addr;
 821
 822         sx25->sx25_family = AF_X25;
 823         *uaddr_len = sizeof(*sx25);
 824
 825         return 0;
 826 }
 827
 828 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 829                         unsigned int lci)
 830 {
 831         struct sock *sk;
 832         struct sock *make;
 833         struct x25_sock *makex25;
 834         struct x25_address source_addr, dest_addr;
 835         struct x25_facilities facilities;
 836         int len, rc;
 837
 838         /*
 839          *      Remove the LCI and frame type.
 840          */
 841         skb_pull(skb, X25_STD_MIN_LEN);
 842
 843         /*
 844          *      Extract the X.25 addresses and convert them to ASCII strings,
 845          *      and remove them.
 846          */
 847         skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
 848
 849         /*
 850          *      Get the length of the facilities, skip past them for the moment
 851          *      get the call user data because this is needed to determine
 852          *      the correct listener
 853          */
 854         len = skb->data[0] + 1;
 855         skb_pull(skb,len);
 856
 857         /*
 858          *      Find a listener for the particular address/cud pair.
 859          */
 860         sk = x25_find_listener(&source_addr,skb);
 861         skb_push(skb,len);
 862
 863         /*
 864          *      We can't accept the Call Request.
 865          */
 866         if (sk == NULL || sk_acceptq_is_full(sk))
 867                 goto out_clear_request;
 868
 869         /*
 870          *      Try to reach a compromise on the requested facilities.
 871          */
 872         if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
 873                 goto out_sock_put;
 874
 875         /*
 876          * current neighbour/link might impose additional limits
 877          * on certain facilties
 878          */
 879
 880         x25_limit_facilities(&facilities, nb);
 881
 882         /*
 883          *      Try to create a new socket.
 884          */
 885         make = x25_make_new(sk);
 886         if (!make)
 887                 goto out_sock_put;
 888
 889         /*
 890          *      Remove the facilities
 891          */
 892         skb_pull(skb, len);
 893
 894         skb->sk     = make;
 895         make->sk_state = TCP_ESTABLISHED;
 896
 897         makex25 = x25_sk(make);
 898         makex25->lci           = lci;
 899         makex25->dest_addr     = dest_addr;
 900         makex25->source_addr   = source_addr;
 901         makex25->neighbour     = nb;
 902         makex25->facilities    = facilities;
 903         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 904         /* ensure no reverse facil on accept */
 905         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 906         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 907
 908         /* Normally all calls are accepted immediatly */
 909         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 910                 x25_write_internal(make, X25_CALL_ACCEPTED);
 911                 makex25->state = X25_STATE_3;
 912         }
 913
 914         /*
 915          *      Incoming Call User Data.
 916          */
 917         if (skb->len >= 0) {
 918                 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
 919                 makex25->calluserdata.cudlength = skb->len;
 920         }
 921
 922         sk->sk_ack_backlog++;
 923
 924         x25_insert_socket(make);
 925
 926         skb_queue_head(&sk->sk_receive_queue, skb);
 927
 928         x25_start_heartbeat(make);
 929
 930         if (!sock_flag(sk, SOCK_DEAD))
 931                 sk->sk_data_ready(sk, skb->len);
 932         rc = 1;
 933         sock_put(sk);
 934 out:
 935         return rc;
 936 out_sock_put:
 937         sock_put(sk);
 938 out_clear_request:
 939         rc = 0;
 940         x25_transmit_clear_request(nb, lci, 0x01);
 941         goto out;
 942 }
 943
 944 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 945                        struct msghdr *msg, size_t len)
 946 {
 947         struct sock *sk = sock->sk;
 948         struct x25_sock *x25 = x25_sk(sk);
 949         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 950         struct sockaddr_x25 sx25;
 951         struct sk_buff *skb;
 952         unsigned char *asmptr;
 953         int noblock = msg->msg_flags & MSG_DONTWAIT;
 954         size_t size;
 955         int qbit = 0, rc = -EINVAL;
 956
 957         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 958                 goto out;
 959
 960         /* we currently don't support segmented records at the user interface */
 961         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 962                 goto out;
 963
 964         rc = -EADDRNOTAVAIL;
 965         if (sock_flag(sk, SOCK_ZAPPED))
 966                 goto out;
 967
 968         rc = -EPIPE;
 969         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 970                 send_sig(SIGPIPE, current, 0);
 971                 goto out;
 972         }
 973
 974         rc = -ENETUNREACH;
 975         if (!x25->neighbour)
 976                 goto out;
 977
 978         if (usx25) {
 979                 rc = -EINVAL;
 980                 if (msg->msg_namelen < sizeof(sx25))
 981                         goto out;
 982                 memcpy(&sx25, usx25, sizeof(sx25));
 983                 rc = -EISCONN;
 984                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
 985                         goto out;
 986                 rc = -EINVAL;
 987                 if (sx25.sx25_family != AF_X25)
 988                         goto out;
 989         } else {
 990                 /*
 991                  *      FIXME 1003.1g - if the socket is like this because
 992                  *      it has become closed (not started closed) we ought
 993                  *      to SIGPIPE, EPIPE;
 994                  */
 995                 rc = -ENOTCONN;
 996                 if (sk->sk_state != TCP_ESTABLISHED)
 997                         goto out;
 998
 999                 sx25.sx25_family = AF_X25;
1000                 sx25.sx25_addr   = x25->dest_addr;
1001         }
1002
1003         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1004
1005         /* Build a packet */
1006         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1007
1008         if ((msg->msg_flags & MSG_OOB) && len > 32)
1009                 len = 32;
1010
1011         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1012
1013         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1014         if (!skb)
1015                 goto out;
1016         X25_SKB_CB(skb)->flags = msg->msg_flags;
1017
1018         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1019
1020         /*
1021          *      Put the data on the end
1022          */
1023         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1024
1025         asmptr = skb->h.raw = skb_put(skb, len);
1026
1027         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1028         if (rc)
1029                 goto out_kfree_skb;
1030
1031         /*
1032          *      If the Q BIT Include socket option is in force, the first
1033          *      byte of the user data is the logical value of the Q Bit.
1034          */
1035         if (x25->qbitincl) {
1036                 qbit = skb->data[0];
1037                 skb_pull(skb, 1);
1038         }
1039
1040         /*
1041          *      Push down the X.25 header
1042          */
1043         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1044
1045         if (msg->msg_flags & MSG_OOB) {
1046                 if (x25->neighbour->extended) {
1047                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1048                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1049                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1050                         *asmptr++ = X25_INTERRUPT;
1051                 } else {
1052                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1053                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1054                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1055                         *asmptr++ = X25_INTERRUPT;
1056                 }
1057         } else {
1058                 if (x25->neighbour->extended) {
1059                         /* Build an Extended X.25 header */
1060                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1061                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1062                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1063                         *asmptr++ = X25_DATA;
1064                         *asmptr++ = X25_DATA;
1065                 } else {
1066                         /* Build an Standard X.25 header */
1067                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1068                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1069                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1070                         *asmptr++ = X25_DATA;
1071                 }
1072
1073                 if (qbit)
1074                         skb->data[0] |= X25_Q_BIT;
1075         }
1076
1077         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1078         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1079
1080         rc = -ENOTCONN;
1081         if (sk->sk_state != TCP_ESTABLISHED)
1082                 goto out_kfree_skb;
1083
1084         if (msg->msg_flags & MSG_OOB)
1085                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1086         else {
1087                 len = x25_output(sk, skb);
1088                 if (len < 0)
1089                         kfree_skb(skb);
1090                 else if (x25->qbitincl)
1091                         len++;
1092         }
1093
1094         /*
1095          * lock_sock() is currently only used to serialize this x25_kick()
1096          * against input-driven x25_kick() calls. It currently only blocks
1097          * incoming packets for this socket and does not protect against
1098          * any other socket state changes and is not called from anywhere
1099          * else. As x25_kick() cannot block and as long as all socket
1100          * operations are BKL-wrapped, we don't need take to care about
1101          * purging the backlog queue in x25_release().
1102          *
1103          * Using lock_sock() to protect all socket operations entirely
1104          * (and making the whole x25 stack SMP aware) unfortunately would
1105          * require major changes to {send,recv}msg and skb allocation methods.
1106          * -> 2.5 ;)
1107          */
1108         lock_sock(sk);
1109         x25_kick(sk);
1110         release_sock(sk);
1111         rc = len;
1112 out:
1113         return rc;
1114 out_kfree_skb:
1115         kfree_skb(skb);
1116         goto out;
1117 }
1118
1119
1120 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1121                        struct msghdr *msg, size_t size,
1122                        int flags)
1123 {
1124         struct sock *sk = sock->sk;
1125         struct x25_sock *x25 = x25_sk(sk);
1126         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1127         size_t copied;
1128         int qbit;
1129         struct sk_buff *skb;
1130         unsigned char *asmptr;
1131         int rc = -ENOTCONN;
1132
1133         /*
1134          * This works for seqpacket too. The receiver has ordered the queue for
1135          * us! We do one quick check first though
1136          */
1137         if (sk->sk_state != TCP_ESTABLISHED)
1138                 goto out;
1139
1140         if (flags & MSG_OOB) {
1141                 rc = -EINVAL;
1142                 if (sock_flag(sk, SOCK_URGINLINE) ||
1143                     !skb_peek(&x25->interrupt_in_queue))
1144                         goto out;
1145
1146                 skb = skb_dequeue(&x25->interrupt_in_queue);
1147
1148                 skb_pull(skb, X25_STD_MIN_LEN);
1149
1150                 /*
1151                  *      No Q bit information on Interrupt data.
1152                  */
1153                 if (x25->qbitincl) {
1154                         asmptr  = skb_push(skb, 1);
1155                         *asmptr = 0x00;
1156                 }
1157
1158                 msg->msg_flags |= MSG_OOB;
1159         } else {
1160                 /* Now we can treat all alike */
1161                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1162                                         flags & MSG_DONTWAIT, &rc);
1163                 if (!skb)
1164                         goto out;
1165
1166                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1167
1168                 skb_pull(skb, x25->neighbour->extended ?
1169                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1170
1171                 if (x25->qbitincl) {
1172                         asmptr  = skb_push(skb, 1);
1173                         *asmptr = qbit;
1174                 }
1175         }
1176
1177         skb->h.raw = skb->data;
1178
1179         copied = skb->len;
1180
1181         if (copied > size) {
1182                 copied = size;
1183                 msg->msg_flags |= MSG_TRUNC;
1184         }
1185
1186         /* Currently, each datagram always contains a complete record */
1187         msg->msg_flags |= MSG_EOR;
1188
1189         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1190         if (rc)
1191                 goto out_free_dgram;
1192
1193         if (sx25) {
1194                 sx25->sx25_family = AF_X25;
1195                 sx25->sx25_addr   = x25->dest_addr;
1196         }
1197
1198         msg->msg_namelen = sizeof(struct sockaddr_x25);
1199
1200         lock_sock(sk);
1201         x25_check_rbuf(sk);
1202         release_sock(sk);
1203         rc = copied;
1204 out_free_dgram:
1205         skb_free_datagram(sk, skb);
1206 out:
1207         return rc;
1208 }
1209
1210
1211 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1212 {
1213         struct sock *sk = sock->sk;
1214         struct x25_sock *x25 = x25_sk(sk);
1215         void __user *argp = (void __user *)arg;
1216         int rc;
1217
1218         switch (cmd) {
1219                 case TIOCOUTQ: {
1220                         int amount = sk->sk_sndbuf -
1221                                      atomic_read(&sk->sk_wmem_alloc);
1222                         if (amount < 0)
1223                                 amount = 0;
1224                         rc = put_user(amount, (unsigned int __user *)argp);
1225                         break;
1226                 }
1227
1228                 case TIOCINQ: {
1229                         struct sk_buff *skb;
1230                         int amount = 0;
1231                         /*
1232                          * These two are safe on a single CPU system as
1233                          * only user tasks fiddle here
1234                          */
1235                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1236                                 amount = skb->len;
1237                         rc = put_user(amount, (unsigned int __user *)argp);
1238                         break;
1239                 }
1240
1241                 case SIOCGSTAMP:
1242                         rc = -EINVAL;
1243                         if (sk)
1244                                 rc = sock_get_timestamp(sk,
1245                                                 (struct timeval __user *)argp);
1246                         break;
1247                 case SIOCGIFADDR:
1248                 case SIOCSIFADDR:
1249                 case SIOCGIFDSTADDR:
1250                 case SIOCSIFDSTADDR:
1251                 case SIOCGIFBRDADDR:
1252                 case SIOCSIFBRDADDR:
1253                 case SIOCGIFNETMASK:
1254                 case SIOCSIFNETMASK:
1255                 case SIOCGIFMETRIC:
1256                 case SIOCSIFMETRIC:
1257                         rc = -EINVAL;
1258                         break;
1259                 case SIOCADDRT:
1260                 case SIOCDELRT:
1261                         rc = -EPERM;
1262                         if (!capable(CAP_NET_ADMIN))
1263                                 break;
1264                         rc = x25_route_ioctl(cmd, argp);
1265                         break;
1266                 case SIOCX25GSUBSCRIP:
1267                         rc = x25_subscr_ioctl(cmd, argp);
1268                         break;
1269                 case SIOCX25SSUBSCRIP:
1270                         rc = -EPERM;
1271                         if (!capable(CAP_NET_ADMIN))
1272                                 break;
1273                         rc = x25_subscr_ioctl(cmd, argp);
1274                         break;
1275                 case SIOCX25GFACILITIES: {
1276                         struct x25_facilities fac = x25->facilities;
1277                         rc = copy_to_user(argp, &fac,
1278                                           sizeof(fac)) ? -EFAULT : 0;
1279                         break;
1280                 }
1281
1282                 case SIOCX25SFACILITIES: {
1283                         struct x25_facilities facilities;
1284                         rc = -EFAULT;
1285                         if (copy_from_user(&facilities, argp,
1286                                            sizeof(facilities)))
1287                                 break;
1288                         rc = -EINVAL;
1289                         if (sk->sk_state != TCP_LISTEN &&
1290                             sk->sk_state != TCP_CLOSE)
1291                                 break;
1292                         if (facilities.pacsize_in < X25_PS16 ||
1293                             facilities.pacsize_in > X25_PS4096)
1294                                 break;
1295                         if (facilities.pacsize_out < X25_PS16 ||
1296                             facilities.pacsize_out > X25_PS4096)
1297                                 break;
1298                         if (facilities.winsize_in < 1 ||
1299                             facilities.winsize_in > 127)
1300                                 break;
1301                         if (facilities.throughput < 0x03 ||
1302                             facilities.throughput > 0xDD)
1303                                 break;
1304                         if (facilities.reverse &&
1305                                 (facilities.reverse | 0x81)!= 0x81)
1306                                 break;
1307                         x25->facilities = facilities;
1308                         rc = 0;
1309                         break;
1310                 }
1311
1312                 case SIOCX25GCALLUSERDATA: {
1313                         struct x25_calluserdata cud = x25->calluserdata;
1314                         rc = copy_to_user(argp, &cud,
1315                                           sizeof(cud)) ? -EFAULT : 0;
1316                         break;
1317                 }
1318
1319                 case SIOCX25SCALLUSERDATA: {
1320                         struct x25_calluserdata calluserdata;
1321
1322                         rc = -EFAULT;
1323                         if (copy_from_user(&calluserdata, argp,
1324                                            sizeof(calluserdata)))
1325                                 break;
1326                         rc = -EINVAL;
1327                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1328                                 break;
1329                         x25->calluserdata = calluserdata;
1330                         rc = 0;
1331                         break;
1332                 }
1333
1334                 case SIOCX25GCAUSEDIAG: {
1335                         struct x25_causediag causediag;
1336                         causediag = x25->causediag;
1337                         rc = copy_to_user(argp, &causediag,
1338                                           sizeof(causediag)) ? -EFAULT : 0;
1339                         break;
1340                 }
1341
1342                 case SIOCX25SCUDMATCHLEN: {
1343                         struct x25_subaddr sub_addr;
1344                         rc = -EINVAL;
1345                         if(sk->sk_state != TCP_CLOSE)
1346                                 break;
1347                         rc = -EFAULT;
1348                         if (copy_from_user(&sub_addr, argp,
1349                                         sizeof(sub_addr)))
1350                                 break;
1351                         rc = -EINVAL;
1352                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1353                                 break;
1354                         x25->cudmatchlength = sub_addr.cudmatchlength;
1355                         rc = 0;
1356                         break;
1357                 }
1358
1359                 case SIOCX25CALLACCPTAPPRV: {
1360                         rc = -EINVAL;
1361                         if (sk->sk_state != TCP_CLOSE)
1362                                 break;
1363                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1364                         rc = 0;
1365                         break;
1366                 }
1367
1368                 case SIOCX25SENDCALLACCPT:  {
1369                         rc = -EINVAL;
1370                         if (sk->sk_state != TCP_ESTABLISHED)
1371                                 break;
1372                         if (x25->accptapprv)    /* must call accptapprv above */
1373                                 break;
1374                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1375                         x25->state = X25_STATE_3;
1376                         rc = 0;
1377                         break;
1378                 }
1379
1380                 default:
1381                         rc = dev_ioctl(cmd, argp);
1382                         break;
1383         }
1384
1385         return rc;
1386 }
1387
1388 static struct net_proto_family x25_family_ops = {
1389         .family =       AF_X25,
1390         .create =       x25_create,
1391         .owner  =       THIS_MODULE,
1392 };
1393
1394 static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1395         .family =       AF_X25,
1396         .owner =        THIS_MODULE,
1397         .release =      x25_release,
1398         .bind =         x25_bind,
1399         .connect =      x25_connect,
1400         .socketpair =   sock_no_socketpair,
1401         .accept =       x25_accept,
1402         .getname =      x25_getname,
1403         .poll =         datagram_poll,
1404         .ioctl =        x25_ioctl,
1405         .listen =       x25_listen,
1406         .shutdown =     sock_no_shutdown,
1407         .setsockopt =   x25_setsockopt,
1408         .getsockopt =   x25_getsockopt,
1409         .sendmsg =      x25_sendmsg,
1410         .recvmsg =      x25_recvmsg,
1411         .mmap =         sock_no_mmap,
1412         .sendpage =     sock_no_sendpage,
1413 };
1414
1415 #include <linux/smp_lock.h>
1416 SOCKOPS_WRAP(x25_proto, AF_X25);
1417
1418 static struct packet_type x25_packet_type = {
1419         .type = __constant_htons(ETH_P_X25),
1420         .func = x25_lapb_receive_frame,
1421 };
1422
1423 static struct notifier_block x25_dev_notifier = {
1424         .notifier_call = x25_device_event,
1425 };
1426
1427 void x25_kill_by_neigh(struct x25_neigh *nb)
1428 {
1429         struct sock *s;
1430         struct hlist_node *node;
1431
1432         write_lock_bh(&x25_list_lock);
1433
1434         sk_for_each(s, node, &x25_list)
1435                 if (x25_sk(s)->neighbour == nb)
1436                         x25_disconnect(s, ENETUNREACH, 0, 0);
1437
1438         write_unlock_bh(&x25_list_lock);
1439 }
1440
1441 static int __init x25_init(void)
1442 {
1443         int rc = proto_register(&x25_proto, 0);
1444
1445         if (rc != 0)
1446                 goto out;
1447
1448         sock_register(&x25_family_ops);
1449
1450         dev_add_pack(&x25_packet_type);
1451
1452         register_netdevice_notifier(&x25_dev_notifier);
1453
1454         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1455
1456 #ifdef CONFIG_SYSCTL
1457         x25_register_sysctl();
1458 #endif
1459         x25_proc_init();
1460 out:
1461         return rc;
1462 }
1463 module_init(x25_init);
1464
1465 static void __exit x25_exit(void)
1466 {
1467         x25_proc_exit();
1468         x25_link_free();
1469         x25_route_free();
1470
1471 #ifdef CONFIG_SYSCTL
1472         x25_unregister_sysctl();
1473 #endif
1474
1475         unregister_netdevice_notifier(&x25_dev_notifier);
1476
1477         dev_remove_pack(&x25_packet_type);
1478
1479         sock_unregister(AF_X25);
1480         proto_unregister(&x25_proto);
1481 }
1482 module_exit(x25_exit);
1483
1484 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1485 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1486 MODULE_LICENSE("GPL");
1487 MODULE_ALIAS_NETPROTO(PF_X25);