err.no Git - linux-2.6/blob - net/x25/af_x25.c

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