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                 add_timer(&sk->sk_timer);
 351         } else {
 352                 /* drop last reference so sock_put will free */
 353                 __sock_put(sk);
 354         }
 355
 356         release_sock(sk);
 357         sock_put(sk);
 358 }
 359
 360 /*
 361  *      Handling for system calls applied via the various interfaces to a
 362  *      X.25 socket object.
 363  */
 364
 365 static int x25_setsockopt(struct socket *sock, int level, int optname,
 366                           char __user *optval, int optlen)
 367 {
 368         int opt;
 369         struct sock *sk = sock->sk;
 370         int rc = -ENOPROTOOPT;
 371
 372         if (level != SOL_X25 || optname != X25_QBITINCL)
 373                 goto out;
 374
 375         rc = -EINVAL;
 376         if (optlen < sizeof(int))
 377                 goto out;
 378
 379         rc = -EFAULT;
 380         if (get_user(opt, (int __user *)optval))
 381                 goto out;
 382
 383         x25_sk(sk)->qbitincl = !!opt;
 384         rc = 0;
 385 out:
 386         return rc;
 387 }
 388
 389 static int x25_getsockopt(struct socket *sock, int level, int optname,
 390                           char __user *optval, int __user *optlen)
 391 {
 392         struct sock *sk = sock->sk;
 393         int val, len, rc = -ENOPROTOOPT;
 394
 395         if (level != SOL_X25 || optname != X25_QBITINCL)
 396                 goto out;
 397
 398         rc = -EFAULT;
 399         if (get_user(len, optlen))
 400                 goto out;
 401
 402         len = min_t(unsigned int, len, sizeof(int));
 403
 404         rc = -EINVAL;
 405         if (len < 0)
 406                 goto out;
 407
 408         rc = -EFAULT;
 409         if (put_user(len, optlen))
 410                 goto out;
 411
 412         val = x25_sk(sk)->qbitincl;
 413         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 414 out:
 415         return rc;
 416 }
 417
 418 static int x25_listen(struct socket *sock, int backlog)
 419 {
 420         struct sock *sk = sock->sk;
 421         int rc = -EOPNOTSUPP;
 422
 423         if (sk->sk_state != TCP_LISTEN) {
 424                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 425                 sk->sk_max_ack_backlog = backlog;
 426                 sk->sk_state           = TCP_LISTEN;
 427                 rc = 0;
 428         }
 429
 430         return rc;
 431 }
 432
 433 static struct sock *x25_alloc_socket(void)
 434 {
 435         struct x25_opt *x25;
 436         struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, 1, NULL);
 437
 438         if (!sk)
 439                 goto out;
 440
 441         x25 = sk->sk_protinfo = kmalloc(sizeof(*x25), GFP_ATOMIC);
 442         if (!x25)
 443                 goto frees;
 444
 445         memset(x25, 0, sizeof(*x25));
 446
 447         x25->sk = sk;
 448
 449         sock_init_data(NULL, sk);
 450         sk_set_owner(sk, THIS_MODULE);
 451
 452         skb_queue_head_init(&x25->ack_queue);
 453         skb_queue_head_init(&x25->fragment_queue);
 454         skb_queue_head_init(&x25->interrupt_in_queue);
 455         skb_queue_head_init(&x25->interrupt_out_queue);
 456 out:
 457         return sk;
 458 frees:
 459         sk_free(sk);
 460         sk = NULL;
 461         goto out;
 462 }
 463
 464 void x25_init_timers(struct sock *sk);
 465
 466 static int x25_create(struct socket *sock, int protocol)
 467 {
 468         struct sock *sk;
 469         struct x25_opt *x25;
 470         int rc = -ESOCKTNOSUPPORT;
 471
 472         if (sock->type != SOCK_SEQPACKET || protocol)
 473                 goto out;
 474
 475         rc = -ENOMEM;
 476         if ((sk = x25_alloc_socket()) == NULL)
 477                 goto out;
 478
 479         x25 = x25_sk(sk);
 480
 481         sock_init_data(sock, sk);
 482         sk_set_owner(sk, THIS_MODULE);
 483
 484         x25_init_timers(sk);
 485
 486         sock->ops    = &x25_proto_ops;
 487         sk->sk_protocol = protocol;
 488         sk->sk_backlog_rcv = x25_backlog_rcv;
 489
 490         x25->t21   = sysctl_x25_call_request_timeout;
 491         x25->t22   = sysctl_x25_reset_request_timeout;
 492         x25->t23   = sysctl_x25_clear_request_timeout;
 493         x25->t2    = sysctl_x25_ack_holdback_timeout;
 494         x25->state = X25_STATE_0;
 495
 496         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 497         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 498         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 499         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 500         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 501         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 502         rc = 0;
 503 out:
 504         return rc;
 505 }
 506
 507 static struct sock *x25_make_new(struct sock *osk)
 508 {
 509         struct sock *sk = NULL;
 510         struct x25_opt *x25, *ox25;
 511
 512         if (osk->sk_type != SOCK_SEQPACKET)
 513                 goto out;
 514
 515         if ((sk = x25_alloc_socket()) == NULL)
 516                 goto out;
 517
 518         x25 = x25_sk(sk);
 519
 520         sk->sk_type        = osk->sk_type;
 521         sk->sk_socket      = osk->sk_socket;
 522         sk->sk_priority    = osk->sk_priority;
 523         sk->sk_protocol    = osk->sk_protocol;
 524         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 525         sk->sk_sndbuf      = osk->sk_sndbuf;
 526         sk->sk_debug       = osk->sk_debug;
 527         sk->sk_state       = TCP_ESTABLISHED;
 528         sk->sk_sleep       = osk->sk_sleep;
 529         sk->sk_zapped      = osk->sk_zapped;
 530         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 531
 532         ox25 = x25_sk(osk);
 533         x25->t21        = ox25->t21;
 534         x25->t22        = ox25->t22;
 535         x25->t23        = ox25->t23;
 536         x25->t2         = ox25->t2;
 537         x25->facilities = ox25->facilities;
 538         x25->qbitincl   = ox25->qbitincl;
 539
 540         x25_init_timers(sk);
 541 out:
 542         return sk;
 543 }
 544
 545 static int x25_release(struct socket *sock)
 546 {
 547         struct sock *sk = sock->sk;
 548         struct x25_opt *x25;
 549
 550         if (!sk)
 551                 goto out;
 552
 553         x25 = x25_sk(sk);
 554
 555         switch (x25->state) {
 556
 557                 case X25_STATE_0:
 558                 case X25_STATE_2:
 559                         x25_disconnect(sk, 0, 0, 0);
 560                         x25_destroy_socket(sk);
 561                         goto out;
 562
 563                 case X25_STATE_1:
 564                 case X25_STATE_3:
 565                 case X25_STATE_4:
 566                         x25_clear_queues(sk);
 567                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 568                         x25_start_t23timer(sk);
 569                         x25->state = X25_STATE_2;
 570                         sk->sk_state    = TCP_CLOSE;
 571                         sk->sk_shutdown |= SEND_SHUTDOWN;
 572                         sk->sk_state_change(sk);
 573                         sock_set_flag(sk, SOCK_DEAD);
 574                         sock_set_flag(sk, SOCK_DESTROY);
 575                         break;
 576         }
 577
 578         sock->sk        = NULL;
 579         sk->sk_socket   = NULL; /* Not used, but we should do this */
 580 out:
 581         return 0;
 582 }
 583
 584 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 585 {
 586         struct sock *sk = sock->sk;
 587         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 588
 589         if (!sk->sk_zapped ||
 590             addr_len != sizeof(struct sockaddr_x25) ||
 591             addr->sx25_family != AF_X25)
 592                 return -EINVAL;
 593
 594         x25_sk(sk)->source_addr = addr->sx25_addr;
 595         x25_insert_socket(sk);
 596         sk->sk_zapped = 0;
 597         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 598
 599         return 0;
 600 }
 601
 602 static int x25_wait_for_connection_establishment(struct sock *sk)
 603 {
 604         DECLARE_WAITQUEUE(wait, current);
 605         int rc;
 606
 607         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 608         for (;;) {
 609                 __set_current_state(TASK_INTERRUPTIBLE);
 610                 rc = -ERESTARTSYS;
 611                 if (signal_pending(current))
 612                         break;
 613                 rc = sock_error(sk);
 614                 if (rc) {
 615                         sk->sk_socket->state = SS_UNCONNECTED;
 616                         break;
 617                 }
 618                 rc = 0;
 619                 if (sk->sk_state != TCP_ESTABLISHED) {
 620                         release_sock(sk);
 621                         schedule();
 622                         lock_sock(sk);
 623                 } else
 624                         break;
 625         }
 626         __set_current_state(TASK_RUNNING);
 627         remove_wait_queue(sk->sk_sleep, &wait);
 628         return rc;
 629 }
 630
 631 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 632                        int addr_len, int flags)
 633 {
 634         struct sock *sk = sock->sk;
 635         struct x25_opt *x25 = x25_sk(sk);
 636         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 637         struct x25_route *rt;
 638         int rc = 0;
 639
 640         lock_sock(sk);
 641         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 642                 sock->state = SS_CONNECTED;
 643                 goto out; /* Connect completed during a ERESTARTSYS event */
 644         }
 645
 646         rc = -ECONNREFUSED;
 647         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 648                 sock->state = SS_UNCONNECTED;
 649                 goto out;
 650         }
 651
 652         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 653         if (sk->sk_state == TCP_ESTABLISHED)
 654                 goto out;
 655
 656         sk->sk_state   = TCP_CLOSE;
 657         sock->state = SS_UNCONNECTED;
 658
 659         rc = -EINVAL;
 660         if (addr_len != sizeof(struct sockaddr_x25) ||
 661             addr->sx25_family != AF_X25)
 662                 goto out;
 663
 664         rc = -ENETUNREACH;
 665         rt = x25_get_route(&addr->sx25_addr);
 666         if (!rt)
 667                 goto out;
 668
 669         x25->neighbour = x25_get_neigh(rt->dev);
 670         if (!x25->neighbour)
 671                 goto out_put_route;
 672
 673         x25_limit_facilities(&x25->facilities, x25->neighbour);
 674
 675         x25->lci = x25_new_lci(x25->neighbour);
 676         if (!x25->lci)
 677                 goto out_put_neigh;
 678
 679         rc = -EINVAL;
 680         if (sk->sk_zapped) /* Must bind first - autobinding does not work */
 681                 goto out_put_neigh;
 682
 683         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 684                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 685
 686         x25->dest_addr = addr->sx25_addr;
 687
 688         /* Move to connecting socket, start sending Connect Requests */
 689         sock->state   = SS_CONNECTING;
 690         sk->sk_state  = TCP_SYN_SENT;
 691
 692         x25->state = X25_STATE_1;
 693
 694         x25_write_internal(sk, X25_CALL_REQUEST);
 695
 696         x25_start_heartbeat(sk);
 697         x25_start_t21timer(sk);
 698
 699         /* Now the loop */
 700         rc = -EINPROGRESS;
 701         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 702                 goto out_put_neigh;
 703
 704         rc = x25_wait_for_connection_establishment(sk);
 705         if (rc)
 706                 goto out_put_neigh;
 707
 708         sock->state = SS_CONNECTED;
 709         rc = 0;
 710 out_put_neigh:
 711         if (rc)
 712                 x25_neigh_put(x25->neighbour);
 713 out_put_route:
 714         x25_route_put(rt);
 715 out:
 716         release_sock(sk);
 717         return rc;
 718 }
 719
 720 static int x25_wait_for_data(struct sock *sk, int timeout)
 721 {
 722         DECLARE_WAITQUEUE(wait, current);
 723         int rc = 0;
 724
 725         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 726         for (;;) {
 727                 __set_current_state(TASK_INTERRUPTIBLE);
 728                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 729                         break;
 730                 rc = -ERESTARTSYS;
 731                 if (signal_pending(current))
 732                         break;
 733                 rc = -EAGAIN;
 734                 if (!timeout)
 735                         break;
 736                 rc = 0;
 737                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 738                         release_sock(sk);
 739                         timeout = schedule_timeout(timeout);
 740                         lock_sock(sk);
 741                 } else
 742                         break;
 743         }
 744         __set_current_state(TASK_RUNNING);
 745         remove_wait_queue(sk->sk_sleep, &wait);
 746         return rc;
 747 }
 748
 749 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 750 {
 751         struct sock *sk = sock->sk;
 752         struct sock *newsk;
 753         struct sk_buff *skb;
 754         int rc = -EINVAL;
 755
 756         if (!sk || sk->sk_state != TCP_LISTEN)
 757                 goto out;
 758
 759         rc = -EOPNOTSUPP;
 760         if (sk->sk_type != SOCK_SEQPACKET)
 761                 goto out;
 762
 763         lock_sock(sk);
 764         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 765         if (rc)
 766                 goto out2;
 767         skb = skb_dequeue(&sk->sk_receive_queue);
 768         rc = -EINVAL;
 769         if (!skb->sk)
 770                 goto out2;
 771         newsk            = skb->sk;
 772         newsk->sk_pair   = NULL;
 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         make->sk_pair = sk;
 891
 892         x25_insert_socket(make);
 893
 894         skb_queue_head(&sk->sk_receive_queue, skb);
 895
 896         x25_start_heartbeat(make);
 897
 898         if (!sock_flag(sk, SOCK_DEAD))
 899                 sk->sk_data_ready(sk, skb->len);
 900         rc = 1;
 901         sock_put(sk);
 902 out:
 903         return rc;
 904 out_sock_put:
 905         sock_put(sk);
 906 out_clear_request:
 907         rc = 0;
 908         x25_transmit_clear_request(nb, lci, 0x01);
 909         goto out;
 910 }
 911
 912 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 913                        struct msghdr *msg, size_t len)
 914 {
 915         struct sock *sk = sock->sk;
 916         struct x25_opt *x25 = x25_sk(sk);
 917         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 918         struct sockaddr_x25 sx25;
 919         struct sk_buff *skb;
 920         unsigned char *asmptr;
 921         int noblock = msg->msg_flags & MSG_DONTWAIT;
 922         size_t size;
 923         int qbit = 0, rc = -EINVAL;
 924
 925         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 926                 goto out;
 927
 928         /* we currently don't support segmented records at the user interface */
 929         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 930                 goto out;
 931
 932         rc = -EADDRNOTAVAIL;
 933         if (sk->sk_zapped)
 934                 goto out;
 935
 936         rc = -EPIPE;
 937         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 938                 send_sig(SIGPIPE, current, 0);
 939                 goto out;
 940         }
 941
 942         rc = -ENETUNREACH;
 943         if (!x25->neighbour)
 944                 goto out;
 945
 946         if (usx25) {
 947                 rc = -EINVAL;
 948                 if (msg->msg_namelen < sizeof(sx25))
 949                         goto out;
 950                 memcpy(&sx25, usx25, sizeof(sx25));
 951                 rc = -EISCONN;
 952                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
 953                         goto out;
 954                 rc = -EINVAL;
 955                 if (sx25.sx25_family != AF_X25)
 956                         goto out;
 957         } else {
 958                 /*
 959                  *      FIXME 1003.1g - if the socket is like this because
 960                  *      it has become closed (not started closed) we ought
 961                  *      to SIGPIPE, EPIPE;
 962                  */
 963                 rc = -ENOTCONN;
 964                 if (sk->sk_state != TCP_ESTABLISHED)
 965                         goto out;
 966
 967                 sx25.sx25_family = AF_X25;
 968                 sx25.sx25_addr   = x25->dest_addr;
 969         }
 970
 971         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
 972
 973         /* Build a packet */
 974         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
 975
 976         if ((msg->msg_flags & MSG_OOB) && len > 32)
 977                 len = 32;
 978
 979         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
 980
 981         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
 982         if (!skb)
 983                 goto out;
 984         X25_SKB_CB(skb)->flags = msg->msg_flags;
 985
 986         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
 987
 988         /*
 989          *      Put the data on the end
 990          */
 991         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
 992
 993         asmptr = skb->h.raw = skb_put(skb, len);
 994
 995         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
 996         if (rc)
 997                 goto out_kfree_skb;
 998
 999         /*
1000          *      If the Q BIT Include socket option is in force, the first
1001          *      byte of the user data is the logical value of the Q Bit.
1002          */
1003         if (x25->qbitincl) {
1004                 qbit = skb->data[0];
1005                 skb_pull(skb, 1);
1006         }
1007
1008         /*
1009          *      Push down the X.25 header
1010          */
1011         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1012
1013         if (msg->msg_flags & MSG_OOB) {
1014                 if (x25->neighbour->extended) {
1015                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1016                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1017                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1018                         *asmptr++ = X25_INTERRUPT;
1019                 } else {
1020                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1021                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1022                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1023                         *asmptr++ = X25_INTERRUPT;
1024                 }
1025         } else {
1026                 if (x25->neighbour->extended) {
1027                         /* Build an Extended X.25 header */
1028                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1029                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1030                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1031                         *asmptr++ = X25_DATA;
1032                         *asmptr++ = X25_DATA;
1033                 } else {
1034                         /* Build an Standard X.25 header */
1035                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1036                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1037                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1038                         *asmptr++ = X25_DATA;
1039                 }
1040
1041                 if (qbit)
1042                         skb->data[0] |= X25_Q_BIT;
1043         }
1044
1045         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1046         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1047
1048         rc = -ENOTCONN;
1049         if (sk->sk_state != TCP_ESTABLISHED)
1050                 goto out_kfree_skb;
1051
1052         if (msg->msg_flags & MSG_OOB)
1053                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1054         else {
1055                 len = x25_output(sk, skb);
1056                 if (len < 0)
1057                         kfree_skb(skb);
1058                 else if (x25->qbitincl)
1059                         len++;
1060         }
1061
1062         /*
1063          * lock_sock() is currently only used to serialize this x25_kick()
1064          * against input-driven x25_kick() calls. It currently only blocks
1065          * incoming packets for this socket and does not protect against
1066          * any other socket state changes and is not called from anywhere
1067          * else. As x25_kick() cannot block and as long as all socket
1068          * operations are BKL-wrapped, we don't need take to care about
1069          * purging the backlog queue in x25_release().
1070          *
1071          * Using lock_sock() to protect all socket operations entirely
1072          * (and making the whole x25 stack SMP aware) unfortunately would
1073          * require major changes to {send,recv}msg and skb allocation methods.
1074          * -> 2.5 ;)
1075          */
1076         lock_sock(sk);
1077         x25_kick(sk);
1078         release_sock(sk);
1079         rc = len;
1080 out:
1081         return rc;
1082 out_kfree_skb:
1083         kfree_skb(skb);
1084         goto out;
1085 }
1086
1087
1088 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1089                        struct msghdr *msg, size_t size,
1090                        int flags)
1091 {
1092         struct sock *sk = sock->sk;
1093         struct x25_opt *x25 = x25_sk(sk);
1094         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1095         size_t copied;
1096         int qbit;
1097         struct sk_buff *skb;
1098         unsigned char *asmptr;
1099         int rc = -ENOTCONN;
1100
1101         /*
1102          * This works for seqpacket too. The receiver has ordered the queue for
1103          * us! We do one quick check first though
1104          */
1105         if (sk->sk_state != TCP_ESTABLISHED)
1106                 goto out;
1107
1108         if (flags & MSG_OOB) {
1109                 rc = -EINVAL;
1110                 if (sock_flag(sk, SOCK_URGINLINE) ||
1111                     !skb_peek(&x25->interrupt_in_queue))
1112                         goto out;
1113
1114                 skb = skb_dequeue(&x25->interrupt_in_queue);
1115
1116                 skb_pull(skb, X25_STD_MIN_LEN);
1117
1118                 /*
1119                  *      No Q bit information on Interrupt data.
1120                  */
1121                 if (x25->qbitincl) {
1122                         asmptr  = skb_push(skb, 1);
1123                         *asmptr = 0x00;
1124                 }
1125
1126                 msg->msg_flags |= MSG_OOB;
1127         } else {
1128                 /* Now we can treat all alike */
1129                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1130                                         flags & MSG_DONTWAIT, &rc);
1131                 if (!skb)
1132                         goto out;
1133
1134                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1135
1136                 skb_pull(skb, x25->neighbour->extended ?
1137                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1138
1139                 if (x25->qbitincl) {
1140                         asmptr  = skb_push(skb, 1);
1141                         *asmptr = qbit;
1142                 }
1143         }
1144
1145         skb->h.raw = skb->data;
1146
1147         copied = skb->len;
1148
1149         if (copied > size) {
1150                 copied = size;
1151                 msg->msg_flags |= MSG_TRUNC;
1152         }
1153
1154         /* Currently, each datagram always contains a complete record */
1155         msg->msg_flags |= MSG_EOR;
1156
1157         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1158         if (rc)
1159                 goto out_free_dgram;
1160
1161         if (sx25) {
1162                 sx25->sx25_family = AF_X25;
1163                 sx25->sx25_addr   = x25->dest_addr;
1164         }
1165
1166         msg->msg_namelen = sizeof(struct sockaddr_x25);
1167
1168         lock_sock(sk);
1169         x25_check_rbuf(sk);
1170         release_sock(sk);
1171         rc = copied;
1172 out_free_dgram:
1173         skb_free_datagram(sk, skb);
1174 out:
1175         return rc;
1176 }
1177
1178
1179 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1180 {
1181         struct sock *sk = sock->sk;
1182         struct x25_opt *x25 = x25_sk(sk);
1183         void __user *argp = (void __user *)arg;
1184         int rc;
1185
1186         switch (cmd) {
1187                 case TIOCOUTQ: {
1188                         int amount = sk->sk_sndbuf -
1189                                      atomic_read(&sk->sk_wmem_alloc);
1190                         if (amount < 0)
1191                                 amount = 0;
1192                         rc = put_user(amount, (unsigned int __user *)argp);
1193                         break;
1194                 }
1195
1196                 case TIOCINQ: {
1197                         struct sk_buff *skb;
1198                         int amount = 0;
1199                         /*
1200                          * These two are safe on a single CPU system as
1201                          * only user tasks fiddle here
1202                          */
1203                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1204                                 amount = skb->len;
1205                         rc = put_user(amount, (unsigned int __user *)argp);
1206                         break;
1207                 }
1208
1209                 case SIOCGSTAMP:
1210                         rc = -EINVAL;
1211                         if (sk)
1212                                 rc = sock_get_timestamp(sk,
1213                                                 (struct timeval __user *)argp);
1214                         break;
1215                 case SIOCGIFADDR:
1216                 case SIOCSIFADDR:
1217                 case SIOCGIFDSTADDR:
1218                 case SIOCSIFDSTADDR:
1219                 case SIOCGIFBRDADDR:
1220                 case SIOCSIFBRDADDR:
1221                 case SIOCGIFNETMASK:
1222                 case SIOCSIFNETMASK:
1223                 case SIOCGIFMETRIC:
1224                 case SIOCSIFMETRIC:
1225                         rc = -EINVAL;
1226                         break;
1227                 case SIOCADDRT:
1228                 case SIOCDELRT:
1229                         rc = -EPERM;
1230                         if (!capable(CAP_NET_ADMIN))
1231                                 break;
1232                         rc = x25_route_ioctl(cmd, argp);
1233                         break;
1234                 case SIOCX25GSUBSCRIP:
1235                         rc = x25_subscr_ioctl(cmd, argp);
1236                         break;
1237                 case SIOCX25SSUBSCRIP:
1238                         rc = -EPERM;
1239                         if (!capable(CAP_NET_ADMIN))
1240                                 break;
1241                         rc = x25_subscr_ioctl(cmd, argp);
1242                         break;
1243                 case SIOCX25GFACILITIES: {
1244                         struct x25_facilities fac = x25->facilities;
1245                         rc = copy_to_user(argp, &fac,
1246                                           sizeof(fac)) ? -EFAULT : 0;
1247                         break;
1248                 }
1249
1250                 case SIOCX25SFACILITIES: {
1251                         struct x25_facilities facilities;
1252                         rc = -EFAULT;
1253                         if (copy_from_user(&facilities, argp,
1254                                            sizeof(facilities)))
1255                                 break;
1256                         rc = -EINVAL;
1257                         if (sk->sk_state != TCP_LISTEN &&
1258                             sk->sk_state != TCP_CLOSE)
1259                                 break;
1260                         if (facilities.pacsize_in < X25_PS16 ||
1261                             facilities.pacsize_in > X25_PS4096)
1262                                 break;
1263                         if (facilities.pacsize_out < X25_PS16 ||
1264                             facilities.pacsize_out > X25_PS4096)
1265                                 break;
1266                         if (facilities.winsize_in < 1 ||
1267                             facilities.winsize_in > 127)
1268                                 break;
1269                         if (facilities.throughput < 0x03 ||
1270                             facilities.throughput > 0xDD)
1271                                 break;
1272                         if (facilities.reverse && facilities.reverse != 1)
1273                                 break;
1274                         x25->facilities = facilities;
1275                         rc = 0;
1276                         break;
1277                 }
1278
1279                 case SIOCX25GCALLUSERDATA: {
1280                         struct x25_calluserdata cud = x25->calluserdata;
1281                         rc = copy_to_user(argp, &cud,
1282                                           sizeof(cud)) ? -EFAULT : 0;
1283                         break;
1284                 }
1285
1286                 case SIOCX25SCALLUSERDATA: {
1287                         struct x25_calluserdata calluserdata;
1288
1289                         rc = -EFAULT;
1290                         if (copy_from_user(&calluserdata, argp,
1291                                            sizeof(calluserdata)))
1292                                 break;
1293                         rc = -EINVAL;
1294                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1295                                 break;
1296                         x25->calluserdata = calluserdata;
1297                         rc = 0;
1298                         break;
1299                 }
1300
1301                 case SIOCX25GCAUSEDIAG: {
1302                         struct x25_causediag causediag;
1303                         causediag = x25->causediag;
1304                         rc = copy_to_user(argp, &causediag,
1305                                           sizeof(causediag)) ? -EFAULT : 0;
1306                         break;
1307                 }
1308
1309                 default:
1310                         rc = dev_ioctl(cmd, argp);
1311                         break;
1312         }
1313
1314         return rc;
1315 }
1316
1317 struct net_proto_family x25_family_ops = {
1318         .family =       AF_X25,
1319         .create =       x25_create,
1320         .owner  =       THIS_MODULE,
1321 };
1322
1323 static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1324         .family =       AF_X25,
1325         .owner =        THIS_MODULE,
1326         .release =      x25_release,
1327         .bind =         x25_bind,
1328         .connect =      x25_connect,
1329         .socketpair =   sock_no_socketpair,
1330         .accept =       x25_accept,
1331         .getname =      x25_getname,
1332         .poll =         datagram_poll,
1333         .ioctl =        x25_ioctl,
1334         .listen =       x25_listen,
1335         .shutdown =     sock_no_shutdown,
1336         .setsockopt =   x25_setsockopt,
1337         .getsockopt =   x25_getsockopt,
1338         .sendmsg =      x25_sendmsg,
1339         .recvmsg =      x25_recvmsg,
1340         .mmap =         sock_no_mmap,
1341         .sendpage =     sock_no_sendpage,
1342 };
1343
1344 #include <linux/smp_lock.h>
1345 SOCKOPS_WRAP(x25_proto, AF_X25);
1346
1347 static struct packet_type x25_packet_type = {
1348         .type = __constant_htons(ETH_P_X25),
1349         .func = x25_lapb_receive_frame,
1350 };
1351
1352 struct notifier_block x25_dev_notifier = {
1353         .notifier_call = x25_device_event,
1354 };
1355
1356 void x25_kill_by_neigh(struct x25_neigh *nb)
1357 {
1358         struct sock *s;
1359         struct hlist_node *node;
1360
1361         write_lock_bh(&x25_list_lock);
1362
1363         sk_for_each(s, node, &x25_list)
1364                 if (x25_sk(s)->neighbour == nb)
1365                         x25_disconnect(s, ENETUNREACH, 0, 0);
1366
1367         write_unlock_bh(&x25_list_lock);
1368 }
1369
1370 static int __init x25_init(void)
1371 {
1372         sock_register(&x25_family_ops);
1373
1374         dev_add_pack(&x25_packet_type);
1375
1376         register_netdevice_notifier(&x25_dev_notifier);
1377
1378         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1379
1380 #ifdef CONFIG_SYSCTL
1381         x25_register_sysctl();
1382 #endif
1383         x25_proc_init();
1384         return 0;
1385 }
1386 module_init(x25_init);
1387
1388 static void __exit x25_exit(void)
1389 {
1390         x25_proc_exit();
1391         x25_link_free();
1392         x25_route_free();
1393
1394 #ifdef CONFIG_SYSCTL
1395         x25_unregister_sysctl();
1396 #endif
1397
1398         unregister_netdevice_notifier(&x25_dev_notifier);
1399
1400         dev_remove_pack(&x25_packet_type);
1401
1402         sock_unregister(AF_X25);
1403 }
1404 module_exit(x25_exit);
1405
1406 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1407 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1408 MODULE_LICENSE("GPL");
1409 MODULE_ALIAS_NETPROTO(PF_X25);