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