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/kernel.h>
  38 #include <linux/sched.h>
  39 #include <linux/timer.h>
  40 #include <linux/string.h>
  41 #include <linux/net.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/skbuff.h>
  45 #include <net/sock.h>
  46 #include <net/tcp.h>
  47 #include <asm/uaccess.h>
  48 #include <linux/fcntl.h>
  49 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  50 #include <linux/notifier.h>
  51 #include <linux/init.h>
  52 #include <net/x25.h>
  53
  54 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  55 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  56 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  57 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  58 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  59
  60 HLIST_HEAD(x25_list);
  61 DEFINE_RWLOCK(x25_list_lock);
  62
  63 static struct proto_ops x25_proto_ops;
  64
  65 static struct x25_address null_x25_address = {"               "};
  66
  67 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  68                   struct x25_address *calling_addr)
  69 {
  70         int called_len, calling_len;
  71         char *called, *calling;
  72         int i;
  73
  74         called_len  = (*p >> 0) & 0x0F;
  75         calling_len = (*p >> 4) & 0x0F;
  76
  77         called  = called_addr->x25_addr;
  78         calling = calling_addr->x25_addr;
  79         p++;
  80
  81         for (i = 0; i < (called_len + calling_len); i++) {
  82                 if (i < called_len) {
  83                         if (i % 2 != 0) {
  84                                 *called++ = ((*p >> 0) & 0x0F) + '0';
  85                                 p++;
  86                         } else {
  87                                 *called++ = ((*p >> 4) & 0x0F) + '0';
  88                         }
  89                 } else {
  90                         if (i % 2 != 0) {
  91                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
  92                                 p++;
  93                         } else {
  94                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
  95                         }
  96                 }
  97         }
  98
  99         *called = *calling = '\0';
 100
 101         return 1 + (called_len + calling_len + 1) / 2;
 102 }
 103
 104 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 105                   struct x25_address *calling_addr)
 106 {
 107         unsigned int called_len, calling_len;
 108         char *called, *calling;
 109         int i;
 110
 111         called  = called_addr->x25_addr;
 112         calling = calling_addr->x25_addr;
 113
 114         called_len  = strlen(called);
 115         calling_len = strlen(calling);
 116
 117         *p++ = (calling_len << 4) | (called_len << 0);
 118
 119         for (i = 0; i < (called_len + calling_len); i++) {
 120                 if (i < called_len) {
 121                         if (i % 2 != 0) {
 122                                 *p |= (*called++ - '0') << 0;
 123                                 p++;
 124                         } else {
 125                                 *p = 0x00;
 126                                 *p |= (*called++ - '0') << 4;
 127                         }
 128                 } else {
 129                         if (i % 2 != 0) {
 130                                 *p |= (*calling++ - '0') << 0;
 131                                 p++;
 132                         } else {
 133                                 *p = 0x00;
 134                                 *p |= (*calling++ - '0') << 4;
 135                         }
 136                 }
 137         }
 138
 139         return 1 + (called_len + calling_len + 1) / 2;
 140 }
 141
 142 /*
 143  *      Socket removal during an interrupt is now safe.
 144  */
 145 static void x25_remove_socket(struct sock *sk)
 146 {
 147         write_lock_bh(&x25_list_lock);
 148         sk_del_node_init(sk);
 149         write_unlock_bh(&x25_list_lock);
 150 }
 151
 152 /*
 153  *      Kill all bound sockets on a dropped device.
 154  */
 155 static void x25_kill_by_device(struct net_device *dev)
 156 {
 157         struct sock *s;
 158         struct hlist_node *node;
 159
 160         write_lock_bh(&x25_list_lock);
 161
 162         sk_for_each(s, node, &x25_list)
 163                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 164                         x25_disconnect(s, ENETUNREACH, 0, 0);
 165
 166         write_unlock_bh(&x25_list_lock);
 167 }
 168
 169 /*
 170  *      Handle device status changes.
 171  */
 172 static int x25_device_event(struct notifier_block *this, unsigned long event,
 173                             void *ptr)
 174 {
 175         struct net_device *dev = ptr;
 176         struct x25_neigh *nb;
 177
 178         if (dev->type == ARPHRD_X25
 179 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 180          || dev->type == ARPHRD_ETHER
 181 #endif
 182          ) {
 183                 switch (event) {
 184                         case NETDEV_UP:
 185                                 x25_link_device_up(dev);
 186                                 break;
 187                         case NETDEV_GOING_DOWN:
 188                                 nb = x25_get_neigh(dev);
 189                                 if (nb) {
 190                                         x25_terminate_link(nb);
 191                                         x25_neigh_put(nb);
 192                                 }
 193                                 break;
 194                         case NETDEV_DOWN:
 195                                 x25_kill_by_device(dev);
 196                                 x25_route_device_down(dev);
 197                                 x25_link_device_down(dev);
 198                                 break;
 199                 }
 200         }
 201
 202         return NOTIFY_DONE;
 203 }
 204
 205 /*
 206  *      Add a socket to the bound sockets list.
 207  */
 208 static void x25_insert_socket(struct sock *sk)
 209 {
 210         write_lock_bh(&x25_list_lock);
 211         sk_add_node(sk, &x25_list);
 212         write_unlock_bh(&x25_list_lock);
 213 }
 214
 215 /*
 216  *      Find a socket that wants to accept the Call Request we just
 217  *      received. Check the full list for an address/cud match.
 218  *      If no cuds match return the next_best thing, an address match.
 219  *      Note: if a listening socket has cud set it must only get calls
 220  *      with matching cud.
 221  */
 222 static struct sock *x25_find_listener(struct x25_address *addr, struct x25_calluserdata *calluserdata)
 223 {
 224         struct sock *s;
 225         struct sock *next_best;
 226         struct hlist_node *node;
 227
 228         read_lock_bh(&x25_list_lock);
 229         next_best = NULL;
 230
 231         sk_for_each(s, node, &x25_list)
 232                 if ((!strcmp(addr->x25_addr,
 233                              x25_sk(s)->source_addr.x25_addr) ||
 234                      !strcmp(addr->x25_addr,
 235                              null_x25_address.x25_addr)) &&
 236                      s->sk_state == TCP_LISTEN) {
 237
 238                         /*
 239                          * Found a listening socket, now check the incoming
 240                          * call user data vs this sockets call user data
 241                          */
 242                         if (x25_check_calluserdata(&x25_sk(s)->calluserdata, calluserdata)) {
 243                                 sock_hold(s);
 244                                 goto found;
 245                         }
 246                         if (x25_sk(s)->calluserdata.cudlength == 0) {
 247                                 next_best = s;
 248                         }
 249                 }
 250         if (next_best) {
 251                 s = next_best;
 252                 sock_hold(s);
 253                 goto found;
 254         }
 255         s = NULL;
 256 found:
 257         read_unlock_bh(&x25_list_lock);
 258         return s;
 259 }
 260
 261 /*
 262  *      Find a connected X.25 socket given my LCI and neighbour.
 263  */
 264 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 265 {
 266         struct sock *s;
 267         struct hlist_node *node;
 268
 269         sk_for_each(s, node, &x25_list)
 270                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 271                         sock_hold(s);
 272                         goto found;
 273                 }
 274         s = NULL;
 275 found:
 276         return s;
 277 }
 278
 279 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 280 {
 281         struct sock *s;
 282
 283         read_lock_bh(&x25_list_lock);
 284         s = __x25_find_socket(lci, nb);
 285         read_unlock_bh(&x25_list_lock);
 286         return s;
 287 }
 288
 289 /*
 290  *      Find a unique LCI for a given device.
 291  */
 292 static unsigned int x25_new_lci(struct x25_neigh *nb)
 293 {
 294         unsigned int lci = 1;
 295         struct sock *sk;
 296
 297         read_lock_bh(&x25_list_lock);
 298
 299         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 300                 sock_put(sk);
 301                 if (++lci == 4096) {
 302                         lci = 0;
 303                         break;
 304                 }
 305         }
 306
 307         read_unlock_bh(&x25_list_lock);
 308         return lci;
 309 }
 310
 311 /*
 312  *      Deferred destroy.
 313  */
 314 void x25_destroy_socket(struct sock *);
 315
 316 /*
 317  *      handler for deferred kills.
 318  */
 319 static void x25_destroy_timer(unsigned long data)
 320 {
 321         x25_destroy_socket((struct sock *)data);
 322 }
 323
 324 /*
 325  *      This is called from user mode and the timers. Thus it protects itself
 326  *      against interrupt users but doesn't worry about being called during
 327  *      work. Once it is removed from the queue no interrupt or bottom half
 328  *      will touch it and we are (fairly 8-) ) safe.
 329  *      Not static as it's used by the timer
 330  */
 331 void x25_destroy_socket(struct sock *sk)
 332 {
 333         struct sk_buff *skb;
 334
 335         sock_hold(sk);
 336         lock_sock(sk);
 337         x25_stop_heartbeat(sk);
 338         x25_stop_timer(sk);
 339
 340         x25_remove_socket(sk);
 341         x25_clear_queues(sk);           /* Flush the queues */
 342
 343         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 344                 if (skb->sk != sk) {            /* A pending connection */
 345                         /*
 346                          * Queue the unaccepted socket for death
 347                          */
 348                         sock_set_flag(skb->sk, SOCK_DEAD);
 349                         x25_start_heartbeat(skb->sk);
 350                         x25_sk(skb->sk)->state = X25_STATE_0;
 351                 }
 352
 353                 kfree_skb(skb);
 354         }
 355
 356         if (atomic_read(&sk->sk_wmem_alloc) ||
 357             atomic_read(&sk->sk_rmem_alloc)) {
 358                 /* Defer: outstanding buffers */
 359                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 360                 sk->sk_timer.function = x25_destroy_timer;
 361                 sk->sk_timer.data = (unsigned long)sk;
 362                 add_timer(&sk->sk_timer);
 363         } else {
 364                 /* drop last reference so sock_put will free */
 365                 __sock_put(sk);
 366         }
 367
 368         release_sock(sk);
 369         sock_put(sk);
 370 }
 371
 372 /*
 373  *      Handling for system calls applied via the various interfaces to a
 374  *      X.25 socket object.
 375  */
 376
 377 static int x25_setsockopt(struct socket *sock, int level, int optname,
 378                           char __user *optval, int optlen)
 379 {
 380         int opt;
 381         struct sock *sk = sock->sk;
 382         int rc = -ENOPROTOOPT;
 383
 384         if (level != SOL_X25 || optname != X25_QBITINCL)
 385                 goto out;
 386
 387         rc = -EINVAL;
 388         if (optlen < sizeof(int))
 389                 goto out;
 390
 391         rc = -EFAULT;
 392         if (get_user(opt, (int __user *)optval))
 393                 goto out;
 394
 395         x25_sk(sk)->qbitincl = !!opt;
 396         rc = 0;
 397 out:
 398         return rc;
 399 }
 400
 401 static int x25_getsockopt(struct socket *sock, int level, int optname,
 402                           char __user *optval, int __user *optlen)
 403 {
 404         struct sock *sk = sock->sk;
 405         int val, len, rc = -ENOPROTOOPT;
 406
 407         if (level != SOL_X25 || optname != X25_QBITINCL)
 408                 goto out;
 409
 410         rc = -EFAULT;
 411         if (get_user(len, optlen))
 412                 goto out;
 413
 414         len = min_t(unsigned int, len, sizeof(int));
 415
 416         rc = -EINVAL;
 417         if (len < 0)
 418                 goto out;
 419
 420         rc = -EFAULT;
 421         if (put_user(len, optlen))
 422                 goto out;
 423
 424         val = x25_sk(sk)->qbitincl;
 425         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 426 out:
 427         return rc;
 428 }
 429
 430 static int x25_listen(struct socket *sock, int backlog)
 431 {
 432         struct sock *sk = sock->sk;
 433         int rc = -EOPNOTSUPP;
 434
 435         if (sk->sk_state != TCP_LISTEN) {
 436                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 437                 sk->sk_max_ack_backlog = backlog;
 438                 sk->sk_state           = TCP_LISTEN;
 439                 rc = 0;
 440         }
 441
 442         return rc;
 443 }
 444
 445 static struct sock *x25_alloc_socket(void)
 446 {
 447         struct x25_opt *x25;
 448         struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, 1, NULL);
 449
 450         if (!sk)
 451                 goto out;
 452
 453         x25 = sk->sk_protinfo = kmalloc(sizeof(*x25), GFP_ATOMIC);
 454         if (!x25)
 455                 goto frees;
 456
 457         memset(x25, 0, sizeof(*x25));
 458
 459         x25->sk = sk;
 460
 461         sock_init_data(NULL, sk);
 462         sk_set_owner(sk, THIS_MODULE);
 463
 464         skb_queue_head_init(&x25->ack_queue);
 465         skb_queue_head_init(&x25->fragment_queue);
 466         skb_queue_head_init(&x25->interrupt_in_queue);
 467         skb_queue_head_init(&x25->interrupt_out_queue);
 468 out:
 469         return sk;
 470 frees:
 471         sk_free(sk);
 472         sk = NULL;
 473         goto out;
 474 }
 475
 476 void x25_init_timers(struct sock *sk);
 477
 478 static int x25_create(struct socket *sock, int protocol)
 479 {
 480         struct sock *sk;
 481         struct x25_opt *x25;
 482         int rc = -ESOCKTNOSUPPORT;
 483
 484         if (sock->type != SOCK_SEQPACKET || protocol)
 485                 goto out;
 486
 487         rc = -ENOMEM;
 488         if ((sk = x25_alloc_socket()) == NULL)
 489                 goto out;
 490
 491         x25 = x25_sk(sk);
 492
 493         sk->sk_socket = sock;
 494         sk->sk_type = sock->type;
 495         sk->sk_sleep = &sock->wait;
 496         sock->sk = sk;
 497
 498         x25_init_timers(sk);
 499
 500         sock->ops    = &x25_proto_ops;
 501         sk->sk_protocol = protocol;
 502         sk->sk_backlog_rcv = x25_backlog_rcv;
 503
 504         x25->t21   = sysctl_x25_call_request_timeout;
 505         x25->t22   = sysctl_x25_reset_request_timeout;
 506         x25->t23   = sysctl_x25_clear_request_timeout;
 507         x25->t2    = sysctl_x25_ack_holdback_timeout;
 508         x25->state = X25_STATE_0;
 509
 510         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 511         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 512         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 513         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 514         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 515         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 516         rc = 0;
 517 out:
 518         return rc;
 519 }
 520
 521 static struct sock *x25_make_new(struct sock *osk)
 522 {
 523         struct sock *sk = NULL;
 524         struct x25_opt *x25, *ox25;
 525
 526         if (osk->sk_type != SOCK_SEQPACKET)
 527                 goto out;
 528
 529         if ((sk = x25_alloc_socket()) == NULL)
 530                 goto out;
 531
 532         x25 = x25_sk(sk);
 533
 534         sk->sk_type        = osk->sk_type;
 535         sk->sk_socket      = osk->sk_socket;
 536         sk->sk_priority    = osk->sk_priority;
 537         sk->sk_protocol    = osk->sk_protocol;
 538         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 539         sk->sk_sndbuf      = osk->sk_sndbuf;
 540         sk->sk_debug       = osk->sk_debug;
 541         sk->sk_state       = TCP_ESTABLISHED;
 542         sk->sk_sleep       = osk->sk_sleep;
 543         sk->sk_zapped      = osk->sk_zapped;
 544         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 545
 546         ox25 = x25_sk(osk);
 547         x25->t21        = ox25->t21;
 548         x25->t22        = ox25->t22;
 549         x25->t23        = ox25->t23;
 550         x25->t2         = ox25->t2;
 551         x25->facilities = ox25->facilities;
 552         x25->qbitincl   = ox25->qbitincl;
 553
 554         x25_init_timers(sk);
 555 out:
 556         return sk;
 557 }
 558
 559 static int x25_release(struct socket *sock)
 560 {
 561         struct sock *sk = sock->sk;
 562         struct x25_opt *x25;
 563
 564         if (!sk)
 565                 goto out;
 566
 567         x25 = x25_sk(sk);
 568
 569         switch (x25->state) {
 570
 571                 case X25_STATE_0:
 572                 case X25_STATE_2:
 573                         x25_disconnect(sk, 0, 0, 0);
 574                         x25_destroy_socket(sk);
 575                         goto out;
 576
 577                 case X25_STATE_1:
 578                 case X25_STATE_3:
 579                 case X25_STATE_4:
 580                         x25_clear_queues(sk);
 581                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 582                         x25_start_t23timer(sk);
 583                         x25->state = X25_STATE_2;
 584                         sk->sk_state    = TCP_CLOSE;
 585                         sk->sk_shutdown |= SEND_SHUTDOWN;
 586                         sk->sk_state_change(sk);
 587                         sock_set_flag(sk, SOCK_DEAD);
 588                         sock_set_flag(sk, SOCK_DESTROY);
 589                         break;
 590         }
 591
 592         sock->sk        = NULL;
 593         sk->sk_socket   = NULL; /* Not used, but we should do this */
 594 out:
 595         return 0;
 596 }
 597
 598 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 599 {
 600         struct sock *sk = sock->sk;
 601         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 602
 603         if (!sk->sk_zapped ||
 604             addr_len != sizeof(struct sockaddr_x25) ||
 605             addr->sx25_family != AF_X25)
 606                 return -EINVAL;
 607
 608         x25_sk(sk)->source_addr = addr->sx25_addr;
 609         x25_insert_socket(sk);
 610         sk->sk_zapped = 0;
 611         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 612
 613         return 0;
 614 }
 615
 616 static int x25_wait_for_connection_establishment(struct sock *sk)
 617 {
 618         DECLARE_WAITQUEUE(wait, current);
 619         int rc;
 620
 621         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 622         for (;;) {
 623                 __set_current_state(TASK_INTERRUPTIBLE);
 624                 rc = -ERESTARTSYS;
 625                 if (signal_pending(current))
 626                         break;
 627                 rc = sock_error(sk);
 628                 if (rc) {
 629                         sk->sk_socket->state = SS_UNCONNECTED;
 630                         break;
 631                 }
 632                 rc = 0;
 633                 if (sk->sk_state != TCP_ESTABLISHED) {
 634                         release_sock(sk);
 635                         schedule();
 636                         lock_sock(sk);
 637                 } else
 638                         break;
 639         }
 640         __set_current_state(TASK_RUNNING);
 641         remove_wait_queue(sk->sk_sleep, &wait);
 642         return rc;
 643 }
 644
 645 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 646                        int addr_len, int flags)
 647 {
 648         struct sock *sk = sock->sk;
 649         struct x25_opt *x25 = x25_sk(sk);
 650         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 651         struct x25_route *rt;
 652         int rc = 0;
 653
 654         lock_sock(sk);
 655         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 656                 sock->state = SS_CONNECTED;
 657                 goto out; /* Connect completed during a ERESTARTSYS event */
 658         }
 659
 660         rc = -ECONNREFUSED;
 661         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 662                 sock->state = SS_UNCONNECTED;
 663                 goto out;
 664         }
 665
 666         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 667         if (sk->sk_state == TCP_ESTABLISHED)
 668                 goto out;
 669
 670         sk->sk_state   = TCP_CLOSE;
 671         sock->state = SS_UNCONNECTED;
 672
 673         rc = -EINVAL;
 674         if (addr_len != sizeof(struct sockaddr_x25) ||
 675             addr->sx25_family != AF_X25)
 676                 goto out;
 677
 678         rc = -ENETUNREACH;
 679         rt = x25_get_route(&addr->sx25_addr);
 680         if (!rt)
 681                 goto out;
 682
 683         x25->neighbour = x25_get_neigh(rt->dev);
 684         if (!x25->neighbour)
 685                 goto out_put_route;
 686
 687         x25_limit_facilities(&x25->facilities, x25->neighbour);
 688
 689         x25->lci = x25_new_lci(x25->neighbour);
 690         if (!x25->lci)
 691                 goto out_put_neigh;
 692
 693         rc = -EINVAL;
 694         if (sk->sk_zapped) /* Must bind first - autobinding does not work */
 695                 goto out_put_neigh;
 696
 697         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 698                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 699
 700         x25->dest_addr = addr->sx25_addr;
 701
 702         /* Move to connecting socket, start sending Connect Requests */
 703         sock->state   = SS_CONNECTING;
 704         sk->sk_state  = TCP_SYN_SENT;
 705
 706         x25->state = X25_STATE_1;
 707
 708         x25_write_internal(sk, X25_CALL_REQUEST);
 709
 710         x25_start_heartbeat(sk);
 711         x25_start_t21timer(sk);
 712
 713         /* Now the loop */
 714         rc = -EINPROGRESS;
 715         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 716                 goto out_put_neigh;
 717
 718         rc = x25_wait_for_connection_establishment(sk);
 719         if (rc)
 720                 goto out_put_neigh;
 721
 722         sock->state = SS_CONNECTED;
 723         rc = 0;
 724 out_put_neigh:
 725         if (rc)
 726                 x25_neigh_put(x25->neighbour);
 727 out_put_route:
 728         x25_route_put(rt);
 729 out:
 730         release_sock(sk);
 731         return rc;
 732 }
 733
 734 static int x25_wait_for_data(struct sock *sk, int timeout)
 735 {
 736         DECLARE_WAITQUEUE(wait, current);
 737         int rc = 0;
 738
 739         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 740         for (;;) {
 741                 __set_current_state(TASK_INTERRUPTIBLE);
 742                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 743                         break;
 744                 rc = -ERESTARTSYS;
 745                 if (signal_pending(current))
 746                         break;
 747                 rc = -EAGAIN;
 748                 if (!timeout)
 749                         break;
 750                 rc = 0;
 751                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 752                         release_sock(sk);
 753                         timeout = schedule_timeout(timeout);
 754                         lock_sock(sk);
 755                 } else
 756                         break;
 757         }
 758         __set_current_state(TASK_RUNNING);
 759         remove_wait_queue(sk->sk_sleep, &wait);
 760         return rc;
 761 }
 762
 763 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 764 {
 765         struct sock *sk = sock->sk;
 766         struct sock *newsk;
 767         struct sk_buff *skb;
 768         int rc = -EINVAL;
 769
 770         if (!sk || sk->sk_state != TCP_LISTEN)
 771                 goto out;
 772
 773         rc = -EOPNOTSUPP;
 774         if (sk->sk_type != SOCK_SEQPACKET)
 775                 goto out;
 776
 777         lock_sock(sk);
 778         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 779         if (rc)
 780                 goto out2;
 781         skb = skb_dequeue(&sk->sk_receive_queue);
 782         rc = -EINVAL;
 783         if (!skb->sk)
 784                 goto out2;
 785         newsk            = skb->sk;
 786         newsk->sk_socket = newsock;
 787         newsk->sk_sleep  = &newsock->wait;
 788
 789         /* Now attach up the new socket */
 790         skb->sk = NULL;
 791         kfree_skb(skb);
 792         sk->sk_ack_backlog--;
 793         newsock->sk    = newsk;
 794         newsock->state = SS_CONNECTED;
 795         rc = 0;
 796 out2:
 797         release_sock(sk);
 798 out:
 799         return rc;
 800 }
 801
 802 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 803                        int *uaddr_len, int peer)
 804 {
 805         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 806         struct sock *sk = sock->sk;
 807         struct x25_opt *x25 = x25_sk(sk);
 808
 809         if (peer) {
 810                 if (sk->sk_state != TCP_ESTABLISHED)
 811                         return -ENOTCONN;
 812                 sx25->sx25_addr = x25->dest_addr;
 813         } else
 814                 sx25->sx25_addr = x25->source_addr;
 815
 816         sx25->sx25_family = AF_X25;
 817         *uaddr_len = sizeof(*sx25);
 818
 819         return 0;
 820 }
 821
 822 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 823                         unsigned int lci)
 824 {
 825         struct sock *sk;
 826         struct sock *make;
 827         struct x25_opt *makex25;
 828         struct x25_address source_addr, dest_addr;
 829         struct x25_facilities facilities;
 830         struct x25_calluserdata calluserdata;
 831         int len, rc;
 832
 833         /*
 834          *      Remove the LCI and frame type.
 835          */
 836         skb_pull(skb, X25_STD_MIN_LEN);
 837
 838         /*
 839          *      Extract the X.25 addresses and convert them to ASCII strings,
 840          *      and remove them.
 841          */
 842         skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
 843
 844         /*
 845          *      Get the length of the facilities, skip past them for the moment
 846          *      get the call user data because this is needed to determine
 847          *      the correct listener
 848          */
 849         len = skb->data[0] + 1;
 850         skb_pull(skb,len);
 851
 852         /*
 853          *      Incoming Call User Data.
 854          */
 855         if (skb->len >= 0) {
 856                 memcpy(calluserdata.cuddata, skb->data, skb->len);
 857                 calluserdata.cudlength = skb->len;
 858         }
 859
 860         skb_push(skb,len);
 861
 862         /*
 863          *      Find a listener for the particular address/cud pair.
 864          */
 865         sk = x25_find_listener(&source_addr,&calluserdata);
 866
 867         /*
 868          *      We can't accept the Call Request.
 869          */
 870         if (!sk || sk->sk_ack_backlog == sk->sk_max_ack_backlog)
 871                 goto out_clear_request;
 872
 873         /*
 874          *      Try to reach a compromise on the requested facilities.
 875          */
 876         if ((len = x25_negotiate_facilities(skb, sk, &facilities)) == -1)
 877                 goto out_sock_put;
 878
 879         /*
 880          * current neighbour/link might impose additional limits
 881          * on certain facilties
 882          */
 883
 884         x25_limit_facilities(&facilities, nb);
 885
 886         /*
 887          *      Try to create a new socket.
 888          */
 889         make = x25_make_new(sk);
 890         if (!make)
 891                 goto out_sock_put;
 892
 893         /*
 894          *      Remove the facilities
 895          */
 896         skb_pull(skb, len);
 897
 898         skb->sk     = make;
 899         make->sk_state = TCP_ESTABLISHED;
 900
 901         makex25 = x25_sk(make);
 902         makex25->lci           = lci;
 903         makex25->dest_addr     = dest_addr;
 904         makex25->source_addr   = source_addr;
 905         makex25->neighbour     = nb;
 906         makex25->facilities    = facilities;
 907         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 908         makex25->calluserdata  = calluserdata;
 909
 910         x25_write_internal(make, X25_CALL_ACCEPTED);
 911
 912         makex25->state = X25_STATE_3;
 913
 914         sk->sk_ack_backlog++;
 915
 916         x25_insert_socket(make);
 917
 918         skb_queue_head(&sk->sk_receive_queue, skb);
 919
 920         x25_start_heartbeat(make);
 921
 922         if (!sock_flag(sk, SOCK_DEAD))
 923                 sk->sk_data_ready(sk, skb->len);
 924         rc = 1;
 925         sock_put(sk);
 926 out:
 927         return rc;
 928 out_sock_put:
 929         sock_put(sk);
 930 out_clear_request:
 931         rc = 0;
 932         x25_transmit_clear_request(nb, lci, 0x01);
 933         goto out;
 934 }
 935
 936 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 937                        struct msghdr *msg, size_t len)
 938 {
 939         struct sock *sk = sock->sk;
 940         struct x25_opt *x25 = x25_sk(sk);
 941         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 942         struct sockaddr_x25 sx25;
 943         struct sk_buff *skb;
 944         unsigned char *asmptr;
 945         int noblock = msg->msg_flags & MSG_DONTWAIT;
 946         size_t size;
 947         int qbit = 0, rc = -EINVAL;
 948
 949         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 950                 goto out;
 951
 952         /* we currently don't support segmented records at the user interface */
 953         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 954                 goto out;
 955
 956         rc = -EADDRNOTAVAIL;
 957         if (sk->sk_zapped)
 958                 goto out;
 959
 960         rc = -EPIPE;
 961         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 962                 send_sig(SIGPIPE, current, 0);
 963                 goto out;
 964         }
 965
 966         rc = -ENETUNREACH;
 967         if (!x25->neighbour)
 968                 goto out;
 969
 970         if (usx25) {
 971                 rc = -EINVAL;
 972                 if (msg->msg_namelen < sizeof(sx25))
 973                         goto out;
 974                 memcpy(&sx25, usx25, sizeof(sx25));
 975                 rc = -EISCONN;
 976                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
 977                         goto out;
 978                 rc = -EINVAL;
 979                 if (sx25.sx25_family != AF_X25)
 980                         goto out;
 981         } else {
 982                 /*
 983                  *      FIXME 1003.1g - if the socket is like this because
 984                  *      it has become closed (not started closed) we ought
 985                  *      to SIGPIPE, EPIPE;
 986                  */
 987                 rc = -ENOTCONN;
 988                 if (sk->sk_state != TCP_ESTABLISHED)
 989                         goto out;
 990
 991                 sx25.sx25_family = AF_X25;
 992                 sx25.sx25_addr   = x25->dest_addr;
 993         }
 994
 995         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
 996
 997         /* Build a packet */
 998         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
 999
1000         if ((msg->msg_flags & MSG_OOB) && len > 32)
1001                 len = 32;
1002
1003         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1004
1005         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1006         if (!skb)
1007                 goto out;
1008         X25_SKB_CB(skb)->flags = msg->msg_flags;
1009
1010         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1011
1012         /*
1013          *      Put the data on the end
1014          */
1015         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1016
1017         asmptr = skb->h.raw = skb_put(skb, len);
1018
1019         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1020         if (rc)
1021                 goto out_kfree_skb;
1022
1023         /*
1024          *      If the Q BIT Include socket option is in force, the first
1025          *      byte of the user data is the logical value of the Q Bit.
1026          */
1027         if (x25->qbitincl) {
1028                 qbit = skb->data[0];
1029                 skb_pull(skb, 1);
1030         }
1031
1032         /*
1033          *      Push down the X.25 header
1034          */
1035         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1036
1037         if (msg->msg_flags & MSG_OOB) {
1038                 if (x25->neighbour->extended) {
1039                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1040                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1041                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1042                         *asmptr++ = X25_INTERRUPT;
1043                 } else {
1044                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1045                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1046                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1047                         *asmptr++ = X25_INTERRUPT;
1048                 }
1049         } else {
1050                 if (x25->neighbour->extended) {
1051                         /* Build an Extended X.25 header */
1052                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1053                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1054                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1055                         *asmptr++ = X25_DATA;
1056                         *asmptr++ = X25_DATA;
1057                 } else {
1058                         /* Build an Standard X.25 header */
1059                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1060                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1061                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1062                         *asmptr++ = X25_DATA;
1063                 }
1064
1065                 if (qbit)
1066                         skb->data[0] |= X25_Q_BIT;
1067         }
1068
1069         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1070         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1071
1072         rc = -ENOTCONN;
1073         if (sk->sk_state != TCP_ESTABLISHED)
1074                 goto out_kfree_skb;
1075
1076         if (msg->msg_flags & MSG_OOB)
1077                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1078         else {
1079                 len = x25_output(sk, skb);
1080                 if (len < 0)
1081                         kfree_skb(skb);
1082                 else if (x25->qbitincl)
1083                         len++;
1084         }
1085
1086         /*
1087          * lock_sock() is currently only used to serialize this x25_kick()
1088          * against input-driven x25_kick() calls. It currently only blocks
1089          * incoming packets for this socket and does not protect against
1090          * any other socket state changes and is not called from anywhere
1091          * else. As x25_kick() cannot block and as long as all socket
1092          * operations are BKL-wrapped, we don't need take to care about
1093          * purging the backlog queue in x25_release().
1094          *
1095          * Using lock_sock() to protect all socket operations entirely
1096          * (and making the whole x25 stack SMP aware) unfortunately would
1097          * require major changes to {send,recv}msg and skb allocation methods.
1098          * -> 2.5 ;)
1099          */
1100         lock_sock(sk);
1101         x25_kick(sk);
1102         release_sock(sk);
1103         rc = len;
1104 out:
1105         return rc;
1106 out_kfree_skb:
1107         kfree_skb(skb);
1108         goto out;
1109 }
1110
1111
1112 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1113                        struct msghdr *msg, size_t size,
1114                        int flags)
1115 {
1116         struct sock *sk = sock->sk;
1117         struct x25_opt *x25 = x25_sk(sk);
1118         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1119         size_t copied;
1120         int qbit;
1121         struct sk_buff *skb;
1122         unsigned char *asmptr;
1123         int rc = -ENOTCONN;
1124
1125         /*
1126          * This works for seqpacket too. The receiver has ordered the queue for
1127          * us! We do one quick check first though
1128          */
1129         if (sk->sk_state != TCP_ESTABLISHED)
1130                 goto out;
1131
1132         if (flags & MSG_OOB) {
1133                 rc = -EINVAL;
1134                 if (sock_flag(sk, SOCK_URGINLINE) ||
1135                     !skb_peek(&x25->interrupt_in_queue))
1136                         goto out;
1137
1138                 skb = skb_dequeue(&x25->interrupt_in_queue);
1139
1140                 skb_pull(skb, X25_STD_MIN_LEN);
1141
1142                 /*
1143                  *      No Q bit information on Interrupt data.
1144                  */
1145                 if (x25->qbitincl) {
1146                         asmptr  = skb_push(skb, 1);
1147                         *asmptr = 0x00;
1148                 }
1149
1150                 msg->msg_flags |= MSG_OOB;
1151         } else {
1152                 /* Now we can treat all alike */
1153                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1154                                         flags & MSG_DONTWAIT, &rc);
1155                 if (!skb)
1156                         goto out;
1157
1158                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1159
1160                 skb_pull(skb, x25->neighbour->extended ?
1161                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1162
1163                 if (x25->qbitincl) {
1164                         asmptr  = skb_push(skb, 1);
1165                         *asmptr = qbit;
1166                 }
1167         }
1168
1169         skb->h.raw = skb->data;
1170
1171         copied = skb->len;
1172
1173         if (copied > size) {
1174                 copied = size;
1175                 msg->msg_flags |= MSG_TRUNC;
1176         }
1177
1178         /* Currently, each datagram always contains a complete record */
1179         msg->msg_flags |= MSG_EOR;
1180
1181         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1182         if (rc)
1183                 goto out_free_dgram;
1184
1185         if (sx25) {
1186                 sx25->sx25_family = AF_X25;
1187                 sx25->sx25_addr   = x25->dest_addr;
1188         }
1189
1190         msg->msg_namelen = sizeof(struct sockaddr_x25);
1191
1192         lock_sock(sk);
1193         x25_check_rbuf(sk);
1194         release_sock(sk);
1195         rc = copied;
1196 out_free_dgram:
1197         skb_free_datagram(sk, skb);
1198 out:
1199         return rc;
1200 }
1201
1202
1203 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1204 {
1205         struct sock *sk = sock->sk;
1206         struct x25_opt *x25 = x25_sk(sk);
1207         void __user *argp = (void __user *)arg;
1208         int rc;
1209
1210         switch (cmd) {
1211                 case TIOCOUTQ: {
1212                         int amount = sk->sk_sndbuf -
1213                                      atomic_read(&sk->sk_wmem_alloc);
1214                         if (amount < 0)
1215                                 amount = 0;
1216                         rc = put_user(amount, (unsigned int __user *)argp);
1217                         break;
1218                 }
1219
1220                 case TIOCINQ: {
1221                         struct sk_buff *skb;
1222                         int amount = 0;
1223                         /*
1224                          * These two are safe on a single CPU system as
1225                          * only user tasks fiddle here
1226                          */
1227                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1228                                 amount = skb->len;
1229                         rc = put_user(amount, (unsigned int __user *)argp);
1230                         break;
1231                 }
1232
1233                 case SIOCGSTAMP:
1234                         rc = -EINVAL;
1235                         if (sk)
1236                                 rc = sock_get_timestamp(sk,
1237                                                 (struct timeval __user *)argp);
1238                         break;
1239                 case SIOCGIFADDR:
1240                 case SIOCSIFADDR:
1241                 case SIOCGIFDSTADDR:
1242                 case SIOCSIFDSTADDR:
1243                 case SIOCGIFBRDADDR:
1244                 case SIOCSIFBRDADDR:
1245                 case SIOCGIFNETMASK:
1246                 case SIOCSIFNETMASK:
1247                 case SIOCGIFMETRIC:
1248                 case SIOCSIFMETRIC:
1249                         rc = -EINVAL;
1250                         break;
1251                 case SIOCADDRT:
1252                 case SIOCDELRT:
1253                         rc = -EPERM;
1254                         if (!capable(CAP_NET_ADMIN))
1255                                 break;
1256                         rc = x25_route_ioctl(cmd, argp);
1257                         break;
1258                 case SIOCX25GSUBSCRIP:
1259                         rc = x25_subscr_ioctl(cmd, argp);
1260                         break;
1261                 case SIOCX25SSUBSCRIP:
1262                         rc = -EPERM;
1263                         if (!capable(CAP_NET_ADMIN))
1264                                 break;
1265                         rc = x25_subscr_ioctl(cmd, argp);
1266                         break;
1267                 case SIOCX25GFACILITIES: {
1268                         struct x25_facilities fac = x25->facilities;
1269                         rc = copy_to_user(argp, &fac,
1270                                           sizeof(fac)) ? -EFAULT : 0;
1271                         break;
1272                 }
1273
1274                 case SIOCX25SFACILITIES: {
1275                         struct x25_facilities facilities;
1276                         rc = -EFAULT;
1277                         if (copy_from_user(&facilities, argp,
1278                                            sizeof(facilities)))
1279                                 break;
1280                         rc = -EINVAL;
1281                         if (sk->sk_state != TCP_LISTEN &&
1282                             sk->sk_state != TCP_CLOSE)
1283                                 break;
1284                         if (facilities.pacsize_in < X25_PS16 ||
1285                             facilities.pacsize_in > X25_PS4096)
1286                                 break;
1287                         if (facilities.pacsize_out < X25_PS16 ||
1288                             facilities.pacsize_out > X25_PS4096)
1289                                 break;
1290                         if (facilities.winsize_in < 1 ||
1291                             facilities.winsize_in > 127)
1292                                 break;
1293                         if (facilities.throughput < 0x03 ||
1294                             facilities.throughput > 0xDD)
1295                                 break;
1296                         if (facilities.reverse && facilities.reverse != 1)
1297                                 break;
1298                         x25->facilities = facilities;
1299                         rc = 0;
1300                         break;
1301                 }
1302
1303                 case SIOCX25GCALLUSERDATA: {
1304                         struct x25_calluserdata cud = x25->calluserdata;
1305                         rc = copy_to_user(argp, &cud,
1306                                           sizeof(cud)) ? -EFAULT : 0;
1307                         break;
1308                 }
1309
1310                 case SIOCX25SCALLUSERDATA: {
1311                         struct x25_calluserdata calluserdata;
1312
1313                         rc = -EFAULT;
1314                         if (copy_from_user(&calluserdata, argp,
1315                                            sizeof(calluserdata)))
1316                                 break;
1317                         rc = -EINVAL;
1318                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1319                                 break;
1320                         x25->calluserdata = calluserdata;
1321                         rc = 0;
1322                         break;
1323                 }
1324
1325                 case SIOCX25GCAUSEDIAG: {
1326                         struct x25_causediag causediag;
1327                         causediag = x25->causediag;
1328                         rc = copy_to_user(argp, &causediag,
1329                                           sizeof(causediag)) ? -EFAULT : 0;
1330                         break;
1331                 }
1332
1333                 default:
1334                         rc = dev_ioctl(cmd, argp);
1335                         break;
1336         }
1337
1338         return rc;
1339 }
1340
1341 static struct net_proto_family x25_family_ops = {
1342         .family =       AF_X25,
1343         .create =       x25_create,
1344         .owner  =       THIS_MODULE,
1345 };
1346
1347 static struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1348         .family =       AF_X25,
1349         .owner =        THIS_MODULE,
1350         .release =      x25_release,
1351         .bind =         x25_bind,
1352         .connect =      x25_connect,
1353         .socketpair =   sock_no_socketpair,
1354         .accept =       x25_accept,
1355         .getname =      x25_getname,
1356         .poll =         datagram_poll,
1357         .ioctl =        x25_ioctl,
1358         .listen =       x25_listen,
1359         .shutdown =     sock_no_shutdown,
1360         .setsockopt =   x25_setsockopt,
1361         .getsockopt =   x25_getsockopt,
1362         .sendmsg =      x25_sendmsg,
1363         .recvmsg =      x25_recvmsg,
1364         .mmap =         sock_no_mmap,
1365         .sendpage =     sock_no_sendpage,
1366 };
1367
1368 #include <linux/smp_lock.h>
1369 SOCKOPS_WRAP(x25_proto, AF_X25);
1370
1371 static struct packet_type x25_packet_type = {
1372         .type = __constant_htons(ETH_P_X25),
1373         .func = x25_lapb_receive_frame,
1374 };
1375
1376 static struct notifier_block x25_dev_notifier = {
1377         .notifier_call = x25_device_event,
1378 };
1379
1380 void x25_kill_by_neigh(struct x25_neigh *nb)
1381 {
1382         struct sock *s;
1383         struct hlist_node *node;
1384
1385         write_lock_bh(&x25_list_lock);
1386
1387         sk_for_each(s, node, &x25_list)
1388                 if (x25_sk(s)->neighbour == nb)
1389                         x25_disconnect(s, ENETUNREACH, 0, 0);
1390
1391         write_unlock_bh(&x25_list_lock);
1392 }
1393
1394 static int __init x25_init(void)
1395 {
1396         sock_register(&x25_family_ops);
1397
1398         dev_add_pack(&x25_packet_type);
1399
1400         register_netdevice_notifier(&x25_dev_notifier);
1401
1402         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1403
1404 #ifdef CONFIG_SYSCTL
1405         x25_register_sysctl();
1406 #endif
1407         x25_proc_init();
1408         return 0;
1409 }
1410 module_init(x25_init);
1411
1412 static void __exit x25_exit(void)
1413 {
1414         x25_proc_exit();
1415         x25_link_free();
1416         x25_route_free();
1417
1418 #ifdef CONFIG_SYSCTL
1419         x25_unregister_sysctl();
1420 #endif
1421
1422         unregister_netdevice_notifier(&x25_dev_notifier);
1423
1424         dev_remove_pack(&x25_packet_type);
1425
1426         sock_unregister(AF_X25);
1427 }
1428 module_exit(x25_exit);
1429
1430 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1431 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1432 MODULE_LICENSE("GPL");
1433 MODULE_ALIAS_NETPROTO(PF_X25);