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  */
  33
  34 #include <linux/config.h>
  35 #include <linux/module.h>
  36 #include <linux/errno.h>
  37 #include <linux/types.h>
  38 #include <linux/socket.h>
  39 #include <linux/in.h>
  40 #include <linux/kernel.h>
  41 #include <linux/sched.h>
  42 #include <linux/timer.h>
  43 #include <linux/string.h>
  44 #include <linux/sockios.h>
  45 #include <linux/net.h>
  46 #include <linux/stat.h>
  47 #include <linux/inet.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_arp.h>
  50 #include <linux/skbuff.h>
  51 #include <net/sock.h>
  52 #include <net/tcp.h>
  53 #include <asm/system.h>
  54 #include <asm/uaccess.h>
  55 #include <linux/fcntl.h>
  56 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  57 #include <linux/mm.h>
  58 #include <linux/interrupt.h>
  59 #include <linux/notifier.h>
  60 #include <linux/init.h>
  61 #include <net/x25.h>
  62
  63 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  64 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  65 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  66 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  67 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  68
  69 HLIST_HEAD(x25_list);
  70 rwlock_t x25_list_lock = RW_LOCK_UNLOCKED;
  71
  72 static struct proto_ops x25_proto_ops;
  73
  74 static struct x25_address null_x25_address = {"               "};
  75
  76 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  77                   struct x25_address *calling_addr)
  78 {
  79         int called_len, calling_len;
  80         char *called, *calling;
  81         int i;
  82
  83         called_len  = (*p >> 0) & 0x0F;
  84         calling_len = (*p >> 4) & 0x0F;
  85
  86         called  = called_addr->x25_addr;
  87         calling = calling_addr->x25_addr;
  88         p++;
  89
  90         for (i = 0; i < (called_len + calling_len); i++) {
  91                 if (i < called_len) {
  92                         if (i % 2 != 0) {
  93                                 *called++ = ((*p >> 0) & 0x0F) + '0';
  94                                 p++;
  95                         } else {
  96                                 *called++ = ((*p >> 4) & 0x0F) + '0';
  97                         }
  98                 } else {
  99                         if (i % 2 != 0) {
 100                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 101                                 p++;
 102                         } else {
 103                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 104                         }
 105                 }
 106         }
 107
 108         *called = *calling = '\0';
 109
 110         return 1 + (called_len + calling_len + 1) / 2;
 111 }
 112
 113 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 114                   struct x25_address *calling_addr)
 115 {
 116         unsigned int called_len, calling_len;
 117         char *called, *calling;
 118         int i;
 119
 120         called  = called_addr->x25_addr;
 121         calling = calling_addr->x25_addr;
 122
 123         called_len  = strlen(called);
 124         calling_len = strlen(calling);
 125
 126         *p++ = (calling_len << 4) | (called_len << 0);
 127
 128         for (i = 0; i < (called_len + calling_len); i++) {
 129                 if (i < called_len) {
 130                         if (i % 2 != 0) {
 131                                 *p |= (*called++ - '0') << 0;
 132                                 p++;
 133                         } else {
 134                                 *p = 0x00;
 135                                 *p |= (*called++ - '0') << 4;
 136                         }
 137                 } else {
 138                         if (i % 2 != 0) {
 139                                 *p |= (*calling++ - '0') << 0;
 140                                 p++;
 141                         } else {
 142                                 *p = 0x00;
 143                                 *p |= (*calling++ - '0') << 4;
 144                         }
 145                 }
 146         }
 147
 148         return 1 + (called_len + calling_len + 1) / 2;
 149 }
 150
 151 /*
 152  *      Socket removal during an interrupt is now safe.
 153  */
 154 static void x25_remove_socket(struct sock *sk)
 155 {
 156         write_lock_bh(&x25_list_lock);
 157         sk_del_node_init(sk);
 158         write_unlock_bh(&x25_list_lock);
 159 }
 160
 161 /*
 162  *      Kill all bound sockets on a dropped device.
 163  */
 164 static void x25_kill_by_device(struct net_device *dev)
 165 {
 166         struct sock *s;
 167         struct hlist_node *node;
 168
 169         write_lock_bh(&x25_list_lock);
 170
 171         sk_for_each(s, node, &x25_list)
 172                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 173                         x25_disconnect(s, ENETUNREACH, 0, 0);
 174
 175         write_unlock_bh(&x25_list_lock);
 176 }
 177
 178 /*
 179  *      Handle device status changes.
 180  */
 181 static int x25_device_event(struct notifier_block *this, unsigned long event,
 182                             void *ptr)
 183 {
 184         struct net_device *dev = ptr;
 185         struct x25_neigh *nb;
 186
 187         if (dev->type == ARPHRD_X25
 188 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 189          || dev->type == ARPHRD_ETHER
 190 #endif
 191          ) {
 192                 switch (event) {
 193                         case NETDEV_UP:
 194                                 x25_link_device_up(dev);
 195                                 break;
 196                         case NETDEV_GOING_DOWN:
 197                                 nb = x25_get_neigh(dev);
 198                                 if (nb) {
 199                                         x25_terminate_link(nb);
 200                                         x25_neigh_put(nb);
 201                                 }
 202                                 break;
 203                         case NETDEV_DOWN:
 204                                 x25_kill_by_device(dev);
 205                                 x25_route_device_down(dev);
 206                                 x25_link_device_down(dev);
 207                                 break;
 208                 }
 209         }
 210
 211         return NOTIFY_DONE;
 212 }
 213
 214 /*
 215  *      Add a socket to the bound sockets list.
 216  */
 217 static void x25_insert_socket(struct sock *sk)
 218 {
 219         write_lock_bh(&x25_list_lock);
 220         sk_add_node(sk, &x25_list);
 221         write_unlock_bh(&x25_list_lock);
 222 }
 223
 224 /*
 225  *      Find a socket that wants to accept the Call Request we just
 226  *      received.
 227  */
 228 static struct sock *x25_find_listener(struct x25_address *addr)
 229 {
 230         struct sock *s;
 231         struct hlist_node *node;
 232
 233         read_lock_bh(&x25_list_lock);
 234
 235         sk_for_each(s, node, &x25_list)
 236                 if ((!strcmp(addr->x25_addr,
 237                              x25_sk(s)->source_addr.x25_addr) ||
 238                      !strcmp(addr->x25_addr,
 239                              null_x25_address.x25_addr)) &&
 240                      s->sk_state == TCP_LISTEN) {
 241                         sock_hold(s);
 242                         goto found;
 243                 }
 244         s = NULL;
 245 found:
 246         read_unlock_bh(&x25_list_lock);
 247         return s;
 248 }
 249
 250 /*
 251  *      Find a connected X.25 socket given my LCI and neighbour.
 252  */
 253 struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 254 {
 255         struct sock *s;
 256         struct hlist_node *node;
 257
 258         sk_for_each(s, node, &x25_list)
 259                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 260                         sock_hold(s);
 261                         goto found;
 262                 }
 263         s = NULL;
 264 found:
 265         return s;
 266 }
 267
 268 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 269 {
 270         struct sock *s;
 271
 272         read_lock_bh(&x25_list_lock);
 273         s = __x25_find_socket(lci, nb);
 274         read_unlock_bh(&x25_list_lock);
 275         return s;
 276 }
 277
 278 /*
 279  *      Find a unique LCI for a given device.
 280  */
 281 unsigned int x25_new_lci(struct x25_neigh *nb)
 282 {
 283         unsigned int lci = 1;
 284         struct sock *sk;
 285
 286         read_lock_bh(&x25_list_lock);
 287
 288         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 289                 sock_put(sk);
 290                 if (++lci == 4096) {
 291                         lci = 0;
 292                         break;
 293                 }
 294         }
 295
 296         read_unlock_bh(&x25_list_lock);
 297         return lci;
 298 }
 299
 300 /*
 301  *      Deferred destroy.
 302  */
 303 void x25_destroy_socket(struct sock *);
 304
 305 /*
 306  *      handler for deferred kills.
 307  */
 308 static void x25_destroy_timer(unsigned long data)
 309 {
 310         x25_destroy_socket((struct sock *)data);
 311 }
 312
 313 /*
 314  *      This is called from user mode and the timers. Thus it protects itself
 315  *      against interrupt users but doesn't worry about being called during
 316  *      work. Once it is removed from the queue no interrupt or bottom half
 317  *      will touch it and we are (fairly 8-) ) safe.
 318  *      Not static as it's used by the timer
 319  */
 320 void x25_destroy_socket(struct sock *sk)
 321 {
 322         struct sk_buff *skb;
 323
 324         sock_hold(sk);
 325         lock_sock(sk);
 326         x25_stop_heartbeat(sk);
 327         x25_stop_timer(sk);
 328
 329         x25_remove_socket(sk);
 330         x25_clear_queues(sk);           /* Flush the queues */
 331
 332         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 333                 if (skb->sk != sk) {            /* A pending connection */
 334                         /*
 335                          * Queue the unaccepted socket for death
 336                          */
 337                         sock_set_flag(skb->sk, SOCK_DEAD);
 338                         x25_start_heartbeat(skb->sk);
 339                         x25_sk(skb->sk)->state = X25_STATE_0;
 340                 }
 341
 342                 kfree_skb(skb);
 343         }
 344
 345         if (atomic_read(&sk->sk_wmem_alloc) ||
 346             atomic_read(&sk->sk_rmem_alloc)) {
 347                 /* Defer: outstanding buffers */
 348                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 349                 sk->sk_timer.function = x25_destroy_timer;
 350                 sk->sk_timer.data = (unsigned long)sk;
 351                 add_timer(&sk->sk_timer);
 352         } else {
 353                 /* drop last reference so sock_put will free */
 354                 __sock_put(sk);
 355         }
 356
 357         release_sock(sk);
 358         sock_put(sk);
 359 }
 360
 361 /*
 362  *      Handling for system calls applied via the various interfaces to a
 363  *      X.25 socket object.
 364  */
 365
 366 static int x25_setsockopt(struct socket *sock, int level, int optname,
 367                           char __user *optval, int optlen)
 368 {
 369         int opt;
 370         struct sock *sk = sock->sk;
 371         int rc = -ENOPROTOOPT;
 372
 373         if (level != SOL_X25 || optname != X25_QBITINCL)
 374                 goto out;
 375
 376         rc = -EINVAL;
 377         if (optlen < sizeof(int))
 378                 goto out;
 379
 380         rc = -EFAULT;
 381         if (get_user(opt, (int __user *)optval))
 382                 goto out;
 383
 384         x25_sk(sk)->qbitincl = !!opt;
 385         rc = 0;
 386 out:
 387         return rc;
 388 }
 389
 390 static int x25_getsockopt(struct socket *sock, int level, int optname,
 391                           char __user *optval, int __user *optlen)
 392 {
 393         struct sock *sk = sock->sk;
 394         int val, len, rc = -ENOPROTOOPT;
 395
 396         if (level != SOL_X25 || optname != X25_QBITINCL)
 397                 goto out;
 398
 399         rc = -EFAULT;
 400         if (get_user(len, optlen))
 401                 goto out;
 402
 403         len = min_t(unsigned int, len, sizeof(int));
 404
 405         rc = -EINVAL;
 406         if (len < 0)
 407                 goto out;
 408
 409         rc = -EFAULT;
 410         if (put_user(len, optlen))
 411                 goto out;
 412
 413         val = x25_sk(sk)->qbitincl;
 414         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 415 out:
 416         return rc;
 417 }
 418
 419 static int x25_listen(struct socket *sock, int backlog)
 420 {
 421         struct sock *sk = sock->sk;
 422         int rc = -EOPNOTSUPP;
 423
 424         if (sk->sk_state != TCP_LISTEN) {
 425                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 426                 sk->sk_max_ack_backlog = backlog;
 427                 sk->sk_state           = TCP_LISTEN;
 428                 rc = 0;
 429         }
 430
 431         return rc;
 432 }
 433
 434 static struct sock *x25_alloc_socket(void)
 435 {
 436         struct x25_opt *x25;
 437         struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, 1, NULL);
 438
 439         if (!sk)
 440                 goto out;
 441
 442         x25 = sk->sk_protinfo = kmalloc(sizeof(*x25), GFP_ATOMIC);
 443         if (!x25)
 444                 goto frees;
 445
 446         memset(x25, 0, sizeof(*x25));
 447
 448         x25->sk = sk;
 449
 450         sock_init_data(NULL, sk);
 451         sk_set_owner(sk, THIS_MODULE);
 452
 453         skb_queue_head_init(&x25->ack_queue);
 454         skb_queue_head_init(&x25->fragment_queue);
 455         skb_queue_head_init(&x25->interrupt_in_queue);
 456         skb_queue_head_init(&x25->interrupt_out_queue);
 457 out:
 458         return sk;
 459 frees:
 460         sk_free(sk);
 461         sk = NULL;
 462         goto out;
 463 }
 464
 465 void x25_init_timers(struct sock *sk);
 466
 467 static int x25_create(struct socket *sock, int protocol)
 468 {
 469         struct sock *sk;
 470         struct x25_opt *x25;
 471         int rc = -ESOCKTNOSUPPORT;
 472
 473         if (sock->type != SOCK_SEQPACKET || protocol)
 474                 goto out;
 475
 476         rc = -ENOMEM;
 477         if ((sk = x25_alloc_socket()) == NULL)
 478                 goto out;
 479
 480         x25 = x25_sk(sk);
 481
 482         sock_init_data(sock, sk);
 483         sk_set_owner(sk, THIS_MODULE);
 484
 485         x25_init_timers(sk);
 486
 487         sock->ops    = &x25_proto_ops;
 488         sk->sk_protocol = protocol;
 489         sk->sk_backlog_rcv = x25_backlog_rcv;
 490
 491         x25->t21   = sysctl_x25_call_request_timeout;
 492         x25->t22   = sysctl_x25_reset_request_timeout;
 493         x25->t23   = sysctl_x25_clear_request_timeout;
 494         x25->t2    = sysctl_x25_ack_holdback_timeout;
 495         x25->state = X25_STATE_0;
 496
 497         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 498         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 499         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 500         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 501         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 502         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 503         rc = 0;
 504 out:
 505         return rc;
 506 }
 507
 508 static struct sock *x25_make_new(struct sock *osk)
 509 {
 510         struct sock *sk = NULL;
 511         struct x25_opt *x25, *ox25;
 512
 513         if (osk->sk_type != SOCK_SEQPACKET)
 514                 goto out;
 515
 516         if ((sk = x25_alloc_socket()) == NULL)
 517                 goto out;
 518
 519         x25 = x25_sk(sk);
 520
 521         sk->sk_type        = osk->sk_type;
 522         sk->sk_socket      = osk->sk_socket;
 523         sk->sk_priority    = osk->sk_priority;
 524         sk->sk_protocol    = osk->sk_protocol;
 525         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 526         sk->sk_sndbuf      = osk->sk_sndbuf;
 527         sk->sk_debug       = osk->sk_debug;
 528         sk->sk_state       = TCP_ESTABLISHED;
 529         sk->sk_sleep       = osk->sk_sleep;
 530         sk->sk_zapped      = osk->sk_zapped;
 531         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 532
 533         ox25 = x25_sk(osk);
 534         x25->t21        = ox25->t21;
 535         x25->t22        = ox25->t22;
 536         x25->t23        = ox25->t23;
 537         x25->t2         = ox25->t2;
 538         x25->facilities = ox25->facilities;
 539         x25->qbitincl   = ox25->qbitincl;
 540
 541         x25_init_timers(sk);
 542 out:
 543         return sk;
 544 }
 545
 546 static int x25_release(struct socket *sock)
 547 {
 548         struct sock *sk = sock->sk;
 549         struct x25_opt *x25;
 550
 551         if (!sk)
 552                 goto out;
 553
 554         x25 = x25_sk(sk);
 555
 556         switch (x25->state) {
 557
 558                 case X25_STATE_0:
 559                 case X25_STATE_2:
 560                         x25_disconnect(sk, 0, 0, 0);
 561                         x25_destroy_socket(sk);
 562                         goto out;
 563
 564                 case X25_STATE_1:
 565                 case X25_STATE_3:
 566                 case X25_STATE_4:
 567                         x25_clear_queues(sk);
 568                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 569                         x25_start_t23timer(sk);
 570                         x25->state = X25_STATE_2;
 571                         sk->sk_state    = TCP_CLOSE;
 572                         sk->sk_shutdown |= SEND_SHUTDOWN;
 573                         sk->sk_state_change(sk);
 574                         sock_set_flag(sk, SOCK_DEAD);
 575                         sock_set_flag(sk, SOCK_DESTROY);
 576                         break;
 577         }
 578
 579         sock->sk        = NULL;
 580         sk->sk_socket   = NULL; /* Not used, but we should do this */
 581 out:
 582         return 0;
 583 }
 584
 585 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 586 {
 587         struct sock *sk = sock->sk;
 588         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 589
 590         if (!sk->sk_zapped ||
 591             addr_len != sizeof(struct sockaddr_x25) ||
 592             addr->sx25_family != AF_X25)
 593                 return -EINVAL;
 594
 595         x25_sk(sk)->source_addr = addr->sx25_addr;
 596         x25_insert_socket(sk);
 597         sk->sk_zapped = 0;
 598         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 599
 600         return 0;
 601 }
 602
 603 static int x25_wait_for_connection_establishment(struct sock *sk)
 604 {
 605         DECLARE_WAITQUEUE(wait, current);
 606         int rc;
 607
 608         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 609         for (;;) {
 610                 __set_current_state(TASK_INTERRUPTIBLE);
 611                 rc = -ERESTARTSYS;
 612                 if (signal_pending(current))
 613                         break;
 614                 rc = sock_error(sk);
 615                 if (rc) {
 616                         sk->sk_socket->state = SS_UNCONNECTED;
 617                         break;
 618                 }
 619                 rc = 0;
 620                 if (sk->sk_state != TCP_ESTABLISHED) {
 621                         release_sock(sk);
 622                         schedule();
 623                         lock_sock(sk);
 624                 } else
 625                         break;
 626         }
 627         __set_current_state(TASK_RUNNING);
 628         remove_wait_queue(sk->sk_sleep, &wait);
 629         return rc;
 630 }
 631
 632 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 633                        int addr_len, int flags)
 634 {
 635         struct sock *sk = sock->sk;
 636         struct x25_opt *x25 = x25_sk(sk);
 637         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 638         struct x25_route *rt;
 639         int rc = 0;
 640
 641         lock_sock(sk);
 642         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 643                 sock->state = SS_CONNECTED;
 644                 goto out; /* Connect completed during a ERESTARTSYS event */
 645         }
 646
 647         rc = -ECONNREFUSED;
 648         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 649                 sock->state = SS_UNCONNECTED;
 650                 goto out;
 651         }
 652
 653         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 654         if (sk->sk_state == TCP_ESTABLISHED)
 655                 goto out;
 656
 657         sk->sk_state   = TCP_CLOSE;
 658         sock->state = SS_UNCONNECTED;
 659
 660         rc = -EINVAL;
 661         if (addr_len != sizeof(struct sockaddr_x25) ||
 662             addr->sx25_family != AF_X25)
 663                 goto out;
 664
 665         rc = -ENETUNREACH;
 666         rt = x25_get_route(&addr->sx25_addr);
 667         if (!rt)
 668                 goto out;
 669
 670         x25->neighbour = x25_get_neigh(rt->dev);
 671         if (!x25->neighbour)
 672                 goto out_put_route;
 673
 674         x25_limit_facilities(&x25->facilities, x25->neighbour);
 675
 676         x25->lci = x25_new_lci(x25->neighbour);
 677         if (!x25->lci)
 678                 goto out_put_neigh;
 679
 680         rc = -EINVAL;
 681         if (sk->sk_zapped) /* Must bind first - autobinding does not work */
 682                 goto out_put_neigh;
 683
 684         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 685                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 686
 687         x25->dest_addr = addr->sx25_addr;
 688
 689         /* Move to connecting socket, start sending Connect Requests */
 690         sock->state   = SS_CONNECTING;
 691         sk->sk_state  = TCP_SYN_SENT;
 692
 693         x25->state = X25_STATE_1;
 694
 695         x25_write_internal(sk, X25_CALL_REQUEST);
 696
 697         x25_start_heartbeat(sk);
 698         x25_start_t21timer(sk);
 699
 700         /* Now the loop */
 701         rc = -EINPROGRESS;
 702         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 703                 goto out_put_neigh;
 704
 705         rc = x25_wait_for_connection_establishment(sk);
 706         if (rc)
 707                 goto out_put_neigh;
 708
 709         sock->state = SS_CONNECTED;
 710         rc = 0;
 711 out_put_neigh:
 712         if (rc)
 713                 x25_neigh_put(x25->neighbour);
 714 out_put_route:
 715         x25_route_put(rt);
 716 out:
 717         release_sock(sk);
 718         return rc;
 719 }
 720
 721 static int x25_wait_for_data(struct sock *sk, int timeout)
 722 {
 723         DECLARE_WAITQUEUE(wait, current);
 724         int rc = 0;
 725
 726         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 727         for (;;) {
 728                 __set_current_state(TASK_INTERRUPTIBLE);
 729                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 730                         break;
 731                 rc = -ERESTARTSYS;
 732                 if (signal_pending(current))
 733                         break;
 734                 rc = -EAGAIN;
 735                 if (!timeout)
 736                         break;
 737                 rc = 0;
 738                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 739                         release_sock(sk);
 740                         timeout = schedule_timeout(timeout);
 741                         lock_sock(sk);
 742                 } else
 743                         break;
 744         }
 745         __set_current_state(TASK_RUNNING);
 746         remove_wait_queue(sk->sk_sleep, &wait);
 747         return rc;
 748 }
 749
 750 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 751 {
 752         struct sock *sk = sock->sk;
 753         struct sock *newsk;
 754         struct sk_buff *skb;
 755         int rc = -EINVAL;
 756
 757         if (!sk || sk->sk_state != TCP_LISTEN)
 758                 goto out;
 759
 760         rc = -EOPNOTSUPP;
 761         if (sk->sk_type != SOCK_SEQPACKET)
 762                 goto out;
 763
 764         lock_sock(sk);
 765         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 766         if (rc)
 767                 goto out2;
 768         skb = skb_dequeue(&sk->sk_receive_queue);
 769         rc = -EINVAL;
 770         if (!skb->sk)
 771                 goto out2;
 772         newsk            = skb->sk;
 773         newsk->sk_socket = newsock;
 774         newsk->sk_sleep  = &newsock->wait;
 775
 776         /* Now attach up the new socket */
 777         skb->sk = NULL;
 778         kfree_skb(skb);
 779         sk->sk_ack_backlog--;
 780         newsock->sk    = newsk;
 781         newsock->state = SS_CONNECTED;
 782         rc = 0;
 783 out2:
 784         release_sock(sk);
 785 out:
 786         return rc;
 787 }
 788
 789 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 790                        int *uaddr_len, int peer)
 791 {
 792         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 793         struct sock *sk = sock->sk;
 794         struct x25_opt *x25 = x25_sk(sk);
 795
 796         if (peer) {
 797                 if (sk->sk_state != TCP_ESTABLISHED)
 798                         return -ENOTCONN;
 799                 sx25->sx25_addr = x25->dest_addr;
 800         } else
 801                 sx25->sx25_addr = x25->source_addr;
 802
 803         sx25->sx25_family = AF_X25;
 804         *uaddr_len = sizeof(*sx25);
 805
 806         return 0;
 807 }
 808
 809 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 810                         unsigned int lci)
 811 {
 812         struct sock *sk;
 813         struct sock *make;
 814         struct x25_opt *makex25;
 815         struct x25_address source_addr, dest_addr;
 816         struct x25_facilities facilities;
 817         int len, rc;
 818
 819         /*
 820          *      Remove the LCI and frame type.
 821          */
 822         skb_pull(skb, X25_STD_MIN_LEN);
 823
 824         /*
 825          *      Extract the X.25 addresses and convert them to ASCII strings,
 826          *      and remove them.
 827          */
 828         skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
 829
 830         /*
 831          *      Find a listener for the particular address.
 832          */
 833         sk = x25_find_listener(&source_addr);
 834
 835         /*
 836          *      We can't accept the Call Request.
 837          */
 838         if (!sk || sk->sk_ack_backlog == sk->sk_max_ack_backlog)
 839                 goto out_clear_request;
 840
 841         /*
 842          *      Try to reach a compromise on the requested facilities.
 843          */
 844         if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
 845                 goto out_sock_put;
 846
 847         /*
 848          * current neighbour/link might impose additional limits
 849          * on certain facilties
 850          */
 851
 852         x25_limit_facilities(&facilities, nb);
 853
 854         /*
 855          *      Try to create a new socket.
 856          */
 857         make = x25_make_new(sk);
 858         if (!make)
 859                 goto out_sock_put;
 860
 861         /*
 862          *      Remove the facilities, leaving any Call User Data.
 863          */
 864         skb_pull(skb, len);
 865
 866         skb->sk     = make;
 867         make->sk_state = TCP_ESTABLISHED;
 868
 869         makex25 = x25_sk(make);
 870         makex25->lci           = lci;
 871         makex25->dest_addr     = dest_addr;
 872         makex25->source_addr   = source_addr;
 873         makex25->neighbour     = nb;
 874         makex25->facilities    = facilities;
 875         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 876
 877         x25_write_internal(make, X25_CALL_ACCEPTED);
 878
 879         /*
 880          *      Incoming Call User Data.
 881          */
 882         if (skb->len >= 0) {
 883                 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
 884                 makex25->calluserdata.cudlength = skb->len;
 885         }
 886
 887         makex25->state = X25_STATE_3;
 888
 889         sk->sk_ack_backlog++;
 890
 891         x25_insert_socket(make);
 892
 893         skb_queue_head(&sk->sk_receive_queue, skb);
 894
 895         x25_start_heartbeat(make);
 896
 897         if (!sock_flag(sk, SOCK_DEAD))
 898                 sk->sk_data_ready(sk, skb->len);
 899         rc = 1;
 900         sock_put(sk);
 901 out:
 902         return rc;
 903 out_sock_put:
 904         sock_put(sk);
 905 out_clear_request:
 906         rc = 0;
 907         x25_transmit_clear_request(nb, lci, 0x01);
 908         goto out;
 909 }
 910
 911 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 912                        struct msghdr *msg, size_t len)
 913 {
 914         struct sock *sk = sock->sk;
 915         struct x25_opt *x25 = x25_sk(sk);
 916         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 917         struct sockaddr_x25 sx25;
 918         struct sk_buff *skb;
 919         unsigned char *asmptr;
 920         int noblock = msg->msg_flags & MSG_DONTWAIT;
 921         size_t size;
 922         int qbit = 0, rc = -EINVAL;
 923
 924         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 925                 goto out;
 926
 927         /* we currently don't support segmented records at the user interface */
 928         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 929                 goto out;
 930
 931         rc = -EADDRNOTAVAIL;
 932         if (sk->sk_zapped)
 933                 goto out;
 934
 935         rc = -EPIPE;
 936         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 937                 send_sig(SIGPIPE, current, 0);
 938                 goto out;
 939         }
 940
 941         rc = -ENETUNREACH;
 942         if (!x25->neighbour)
 943                 goto out;
 944
 945         if (usx25) {
 946                 rc = -EINVAL;
 947                 if (msg->msg_namelen < sizeof(sx25))
 948                         goto out;
 949                 memcpy(&sx25, usx25, sizeof(sx25));
 950                 rc = -EISCONN;
 951                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
 952                         goto out;
 953                 rc = -EINVAL;
 954                 if (sx25.sx25_family != AF_X25)
 955                         goto out;
 956         } else {
 957                 /*
 958                  *      FIXME 1003.1g - if the socket is like this because
 959                  *      it has become closed (not started closed) we ought
 960                  *      to SIGPIPE, EPIPE;
 961                  */
 962                 rc = -ENOTCONN;
 963                 if (sk->sk_state != TCP_ESTABLISHED)
 964                         goto out;
 965
 966                 sx25.sx25_family = AF_X25;
 967                 sx25.sx25_addr   = x25->dest_addr;
 968         }
 969
 970         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
 971
 972         /* Build a packet */
 973         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
 974
 975         if ((msg->msg_flags & MSG_OOB) && len > 32)
 976                 len = 32;
 977
 978         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
 979
 980         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
 981         if (!skb)
 982                 goto out;
 983         X25_SKB_CB(skb)->flags = msg->msg_flags;
 984
 985         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
 986
 987         /*
 988          *      Put the data on the end
 989          */
 990         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
 991
 992         asmptr = skb->h.raw = skb_put(skb, len);
 993
 994         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
 995         if (rc)
 996                 goto out_kfree_skb;
 997
 998         /*
 999          *      If the Q BIT Include socket option is in force, the first
1000          *      byte of the user data is the logical value of the Q Bit.
1001          */
1002         if (x25->qbitincl) {
1003                 qbit = skb->data[0];
1004                 skb_pull(skb, 1);
1005         }
1006
1007         /*
1008          *      Push down the X.25 header
1009          */
1010         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1011
1012         if (msg->msg_flags & MSG_OOB) {
1013                 if (x25->neighbour->extended) {
1014                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1015                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1016                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1017                         *asmptr++ = X25_INTERRUPT;
1018                 } else {
1019                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1020                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1021                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1022                         *asmptr++ = X25_INTERRUPT;
1023                 }
1024         } else {
1025                 if (x25->neighbour->extended) {
1026                         /* Build an Extended X.25 header */
1027                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1028                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1029                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1030                         *asmptr++ = X25_DATA;
1031                         *asmptr++ = X25_DATA;
1032                 } else {
1033                         /* Build an Standard X.25 header */
1034                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1035                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1036                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1037                         *asmptr++ = X25_DATA;
1038                 }
1039
1040                 if (qbit)
1041                         skb->data[0] |= X25_Q_BIT;
1042         }
1043
1044         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1045         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1046
1047         rc = -ENOTCONN;
1048         if (sk->sk_state != TCP_ESTABLISHED)
1049                 goto out_kfree_skb;
1050
1051         if (msg->msg_flags & MSG_OOB)
1052                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1053         else {
1054                 len = x25_output(sk, skb);
1055                 if (len < 0)
1056                         kfree_skb(skb);
1057                 else if (x25->qbitincl)
1058                         len++;
1059         }
1060
1061         /*
1062          * lock_sock() is currently only used to serialize this x25_kick()
1063          * against input-driven x25_kick() calls. It currently only blocks
1064          * incoming packets for this socket and does not protect against
1065          * any other socket state changes and is not called from anywhere
1066          * else. As x25_kick() cannot block and as long as all socket
1067          * operations are BKL-wrapped, we don't need take to care about
1068          * purging the backlog queue in x25_release().
1069          *
1070          * Using lock_sock() to protect all socket operations entirely
1071          * (and making the whole x25 stack SMP aware) unfortunately would
1072          * require major changes to {send,recv}msg and skb allocation methods.
1073          * -> 2.5 ;)
1074          */
1075         lock_sock(sk);
1076         x25_kick(sk);
1077         release_sock(sk);
1078         rc = len;
1079 out:
1080         return rc;
1081 out_kfree_skb:
1082         kfree_skb(skb);
1083         goto out;
1084 }
1085
1086
1087 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1088                        struct msghdr *msg, size_t size,
1089                        int flags)
1090 {
1091         struct sock *sk = sock->sk;
1092         struct x25_opt *x25 = x25_sk(sk);
1093         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1094         size_t copied;
1095         int qbit;
1096         struct sk_buff *skb;
1097         unsigned char *asmptr;
1098         int rc = -ENOTCONN;
1099
1100         /*
1101          * This works for seqpacket too. The receiver has ordered the queue for
1102          * us! We do one quick check first though
1103          */
1104         if (sk->sk_state != TCP_ESTABLISHED)
1105                 goto out;
1106
1107         if (flags & MSG_OOB) {
1108                 rc = -EINVAL;
1109                 if (sock_flag(sk, SOCK_URGINLINE) ||
1110                     !skb_peek(&x25->interrupt_in_queue))
1111                         goto out;
1112
1113                 skb = skb_dequeue(&x25->interrupt_in_queue);
1114
1115                 skb_pull(skb, X25_STD_MIN_LEN);
1116
1117                 /*
1118                  *      No Q bit information on Interrupt data.
1119                  */
1120                 if (x25->qbitincl) {
1121                         asmptr  = skb_push(skb, 1);
1122                         *asmptr = 0x00;
1123                 }
1124
1125                 msg->msg_flags |= MSG_OOB;
1126         } else {
1127                 /* Now we can treat all alike */
1128                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1129                                         flags & MSG_DONTWAIT, &rc);
1130                 if (!skb)
1131                         goto out;
1132
1133                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1134
1135                 skb_pull(skb, x25->neighbour->extended ?
1136                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1137
1138                 if (x25->qbitincl) {
1139                         asmptr  = skb_push(skb, 1);
1140                         *asmptr = qbit;
1141                 }
1142         }
1143
1144         skb->h.raw = skb->data;
1145
1146         copied = skb->len;
1147
1148         if (copied > size) {
1149                 copied = size;
1150                 msg->msg_flags |= MSG_TRUNC;
1151         }
1152
1153         /* Currently, each datagram always contains a complete record */
1154         msg->msg_flags |= MSG_EOR;
1155
1156         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1157         if (rc)
1158                 goto out_free_dgram;
1159
1160         if (sx25) {
1161                 sx25->sx25_family = AF_X25;
1162                 sx25->sx25_addr   = x25->dest_addr;
1163         }
1164
1165         msg->msg_namelen = sizeof(struct sockaddr_x25);
1166
1167         lock_sock(sk);
1168         x25_check_rbuf(sk);
1169         release_sock(sk);
1170         rc = copied;
1171 out_free_dgram:
1172         skb_free_datagram(sk, skb);
1173 out:
1174         return rc;
1175 }
1176
1177
1178 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1179 {
1180         struct sock *sk = sock->sk;
1181         struct x25_opt *x25 = x25_sk(sk);
1182         void __user *argp = (void __user *)arg;
1183         int rc;
1184
1185         switch (cmd) {
1186                 case TIOCOUTQ: {
1187                         int amount = sk->sk_sndbuf -
1188                                      atomic_read(&sk->sk_wmem_alloc);
1189                         if (amount < 0)
1190                                 amount = 0;
1191                         rc = put_user(amount, (unsigned int __user *)argp);
1192                         break;
1193                 }
1194
1195                 case TIOCINQ: {
1196                         struct sk_buff *skb;
1197                         int amount = 0;
1198                         /*
1199                          * These two are safe on a single CPU system as
1200                          * only user tasks fiddle here
1201                          */
1202                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1203                                 amount = skb->len;
1204                         rc = put_user(amount, (unsigned int __user *)argp);
1205                         break;
1206                 }
1207
1208                 case SIOCGSTAMP:
1209                         rc = -EINVAL;
1210                         if (sk)
1211                                 rc = sock_get_timestamp(sk,
1212                                                 (struct timeval __user *)argp);
1213                         break;
1214                 case SIOCGIFADDR:
1215                 case SIOCSIFADDR:
1216                 case SIOCGIFDSTADDR:
1217                 case SIOCSIFDSTADDR:
1218                 case SIOCGIFBRDADDR:
1219                 case SIOCSIFBRDADDR:
1220                 case SIOCGIFNETMASK:
1221                 case SIOCSIFNETMASK:
1222                 case SIOCGIFMETRIC:
1223                 case SIOCSIFMETRIC:
1224                         rc = -EINVAL;
1225                         break;
1226                 case SIOCADDRT:
1227                 case SIOCDELRT:
1228                         rc = -EPERM;
1229                         if (!capable(CAP_NET_ADMIN))
1230                                 break;
1231                         rc = x25_route_ioctl(cmd, argp);
1232                         break;
1233                 case SIOCX25GSUBSCRIP:
1234                         rc = x25_subscr_ioctl(cmd, argp);
1235                         break;
1236                 case SIOCX25SSUBSCRIP:
1237                         rc = -EPERM;
1238                         if (!capable(CAP_NET_ADMIN))
1239                                 break;
1240                         rc = x25_subscr_ioctl(cmd, argp);
1241                         break;
1242                 case SIOCX25GFACILITIES: {
1243                         struct x25_facilities fac = x25->facilities;
1244                         rc = copy_to_user(argp, &fac,
1245                                           sizeof(fac)) ? -EFAULT : 0;
1246                         break;
1247                 }
1248
1249                 case SIOCX25SFACILITIES: {
1250                         struct x25_facilities facilities;
1251                         rc = -EFAULT;
1252                         if (copy_from_user(&facilities, argp,
1253                                            sizeof(facilities)))
1254                                 break;
1255                         rc = -EINVAL;
1256                         if (sk->sk_state != TCP_LISTEN &&
1257                             sk->sk_state != TCP_CLOSE)
1258                                 break;
1259                         if (facilities.pacsize_in < X25_PS16 ||
1260                             facilities.pacsize_in > X25_PS4096)
1261                                 break;
1262                         if (facilities.pacsize_out < X25_PS16 ||
1263                             facilities.pacsize_out > X25_PS4096)
1264                                 break;
1265                         if (facilities.winsize_in < 1 ||
1266                             facilities.winsize_in > 127)
1267                                 break;
1268                         if (facilities.throughput < 0x03 ||
1269                             facilities.throughput > 0xDD)
1270                                 break;
1271                         if (facilities.reverse && facilities.reverse != 1)
1272                                 break;
1273                         x25->facilities = facilities;
1274                         rc = 0;
1275                         break;
1276                 }
1277
1278                 case SIOCX25GCALLUSERDATA: {
1279                         struct x25_calluserdata cud = x25->calluserdata;
1280                         rc = copy_to_user(argp, &cud,
1281                                           sizeof(cud)) ? -EFAULT : 0;
1282                         break;
1283                 }
1284
1285                 case SIOCX25SCALLUSERDATA: {
1286                         struct x25_calluserdata calluserdata;
1287
1288                         rc = -EFAULT;
1289                         if (copy_from_user(&calluserdata, argp,
1290                                            sizeof(calluserdata)))
1291                                 break;
1292                         rc = -EINVAL;
1293                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1294                                 break;
1295                         x25->calluserdata = calluserdata;
1296                         rc = 0;
1297                         break;
1298                 }
1299
1300                 case SIOCX25GCAUSEDIAG: {
1301                         struct x25_causediag causediag;
1302                         causediag = x25->causediag;
1303                         rc = copy_to_user(argp, &causediag,
1304                                           sizeof(causediag)) ? -EFAULT : 0;
1305                         break;
1306                 }
1307
1308                 default:
1309                         rc = dev_ioctl(cmd, argp);
1310                         break;
1311         }
1312
1313         return rc;
1314 }
1315
1316 struct net_proto_family x25_family_ops = {
1317         .family =       AF_X25,
1318         .create =       x25_create,
1319         .owner  =       THIS_MODULE,
1320 };
1321
1322 static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1323         .family =       AF_X25,
1324         .owner =        THIS_MODULE,
1325         .release =      x25_release,
1326         .bind =         x25_bind,
1327         .connect =      x25_connect,
1328         .socketpair =   sock_no_socketpair,
1329         .accept =       x25_accept,
1330         .getname =      x25_getname,
1331         .poll =         datagram_poll,
1332         .ioctl =        x25_ioctl,
1333         .listen =       x25_listen,
1334         .shutdown =     sock_no_shutdown,
1335         .setsockopt =   x25_setsockopt,
1336         .getsockopt =   x25_getsockopt,
1337         .sendmsg =      x25_sendmsg,
1338         .recvmsg =      x25_recvmsg,
1339         .mmap =         sock_no_mmap,
1340         .sendpage =     sock_no_sendpage,
1341 };
1342
1343 #include <linux/smp_lock.h>
1344 SOCKOPS_WRAP(x25_proto, AF_X25);
1345
1346 static struct packet_type x25_packet_type = {
1347         .type = __constant_htons(ETH_P_X25),
1348         .func = x25_lapb_receive_frame,
1349 };
1350
1351 struct notifier_block x25_dev_notifier = {
1352         .notifier_call = x25_device_event,
1353 };
1354
1355 void x25_kill_by_neigh(struct x25_neigh *nb)
1356 {
1357         struct sock *s;
1358         struct hlist_node *node;
1359
1360         write_lock_bh(&x25_list_lock);
1361
1362         sk_for_each(s, node, &x25_list)
1363                 if (x25_sk(s)->neighbour == nb)
1364                         x25_disconnect(s, ENETUNREACH, 0, 0);
1365
1366         write_unlock_bh(&x25_list_lock);
1367 }
1368
1369 static int __init x25_init(void)
1370 {
1371         sock_register(&x25_family_ops);
1372
1373         dev_add_pack(&x25_packet_type);
1374
1375         register_netdevice_notifier(&x25_dev_notifier);
1376
1377         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1378
1379 #ifdef CONFIG_SYSCTL
1380         x25_register_sysctl();
1381 #endif
1382         x25_proc_init();
1383         return 0;
1384 }
1385 module_init(x25_init);
1386
1387 static void __exit x25_exit(void)
1388 {
1389         x25_proc_exit();
1390         x25_link_free();
1391         x25_route_free();
1392
1393 #ifdef CONFIG_SYSCTL
1394         x25_unregister_sysctl();
1395 #endif
1396
1397         unregister_netdevice_notifier(&x25_dev_notifier);
1398
1399         dev_remove_pack(&x25_packet_type);
1400
1401         sock_unregister(AF_X25);
1402 }
1403 module_exit(x25_exit);
1404
1405 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1406 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1407 MODULE_LICENSE("GPL");
1408 MODULE_ALIAS_NETPROTO(PF_X25);