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  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/capability.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/timer.h>
  44 #include <linux/string.h>
  45 #include <linux/net.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <net/sock.h>
  50 #include <net/tcp_states.h>
  51 #include <asm/uaccess.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  54 #include <linux/notifier.h>
  55 #include <linux/init.h>
  56 #include <linux/compat.h>
  57
  58 #include <net/x25.h>
  59 #include <net/compat.h>
  60
  61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  62 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  63 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  64 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  65 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  66
  67 HLIST_HEAD(x25_list);
  68 DEFINE_RWLOCK(x25_list_lock);
  69
  70 static const struct proto_ops x25_proto_ops;
  71
  72 static struct x25_address null_x25_address = {"               "};
  73
  74 #ifdef CONFIG_COMPAT
  75 struct compat_x25_subscrip_struct {
  76         char device[200-sizeof(compat_ulong_t)];
  77         compat_ulong_t global_facil_mask;
  78         compat_uint_t extended;
  79 };
  80 #endif
  81
  82 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  83                   struct x25_address *calling_addr)
  84 {
  85         int called_len, calling_len;
  86         char *called, *calling;
  87         int i;
  88
  89         called_len  = (*p >> 0) & 0x0F;
  90         calling_len = (*p >> 4) & 0x0F;
  91
  92         called  = called_addr->x25_addr;
  93         calling = calling_addr->x25_addr;
  94         p++;
  95
  96         for (i = 0; i < (called_len + calling_len); i++) {
  97                 if (i < called_len) {
  98                         if (i % 2 != 0) {
  99                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 100                                 p++;
 101                         } else {
 102                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 103                         }
 104                 } else {
 105                         if (i % 2 != 0) {
 106                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 107                                 p++;
 108                         } else {
 109                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 110                         }
 111                 }
 112         }
 113
 114         *called = *calling = '\0';
 115
 116         return 1 + (called_len + calling_len + 1) / 2;
 117 }
 118
 119 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 120                   struct x25_address *calling_addr)
 121 {
 122         unsigned int called_len, calling_len;
 123         char *called, *calling;
 124         int i;
 125
 126         called  = called_addr->x25_addr;
 127         calling = calling_addr->x25_addr;
 128
 129         called_len  = strlen(called);
 130         calling_len = strlen(calling);
 131
 132         *p++ = (calling_len << 4) | (called_len << 0);
 133
 134         for (i = 0; i < (called_len + calling_len); i++) {
 135                 if (i < called_len) {
 136                         if (i % 2 != 0) {
 137                                 *p |= (*called++ - '0') << 0;
 138                                 p++;
 139                         } else {
 140                                 *p = 0x00;
 141                                 *p |= (*called++ - '0') << 4;
 142                         }
 143                 } else {
 144                         if (i % 2 != 0) {
 145                                 *p |= (*calling++ - '0') << 0;
 146                                 p++;
 147                         } else {
 148                                 *p = 0x00;
 149                                 *p |= (*calling++ - '0') << 4;
 150                         }
 151                 }
 152         }
 153
 154         return 1 + (called_len + calling_len + 1) / 2;
 155 }
 156
 157 /*
 158  *      Socket removal during an interrupt is now safe.
 159  */
 160 static void x25_remove_socket(struct sock *sk)
 161 {
 162         write_lock_bh(&x25_list_lock);
 163         sk_del_node_init(sk);
 164         write_unlock_bh(&x25_list_lock);
 165 }
 166
 167 /*
 168  *      Kill all bound sockets on a dropped device.
 169  */
 170 static void x25_kill_by_device(struct net_device *dev)
 171 {
 172         struct sock *s;
 173         struct hlist_node *node;
 174
 175         write_lock_bh(&x25_list_lock);
 176
 177         sk_for_each(s, node, &x25_list)
 178                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 179                         x25_disconnect(s, ENETUNREACH, 0, 0);
 180
 181         write_unlock_bh(&x25_list_lock);
 182 }
 183
 184 /*
 185  *      Handle device status changes.
 186  */
 187 static int x25_device_event(struct notifier_block *this, unsigned long event,
 188                             void *ptr)
 189 {
 190         struct net_device *dev = ptr;
 191         struct x25_neigh *nb;
 192
 193         if (dev->type == ARPHRD_X25
 194 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 195          || dev->type == ARPHRD_ETHER
 196 #endif
 197          ) {
 198                 switch (event) {
 199                         case NETDEV_UP:
 200                                 x25_link_device_up(dev);
 201                                 break;
 202                         case NETDEV_GOING_DOWN:
 203                                 nb = x25_get_neigh(dev);
 204                                 if (nb) {
 205                                         x25_terminate_link(nb);
 206                                         x25_neigh_put(nb);
 207                                 }
 208                                 break;
 209                         case NETDEV_DOWN:
 210                                 x25_kill_by_device(dev);
 211                                 x25_route_device_down(dev);
 212                                 x25_link_device_down(dev);
 213                                 break;
 214                 }
 215         }
 216
 217         return NOTIFY_DONE;
 218 }
 219
 220 /*
 221  *      Add a socket to the bound sockets list.
 222  */
 223 static void x25_insert_socket(struct sock *sk)
 224 {
 225         write_lock_bh(&x25_list_lock);
 226         sk_add_node(sk, &x25_list);
 227         write_unlock_bh(&x25_list_lock);
 228 }
 229
 230 /*
 231  *      Find a socket that wants to accept the Call Request we just
 232  *      received. Check the full list for an address/cud match.
 233  *      If no cuds match return the next_best thing, an address match.
 234  *      Note: if a listening socket has cud set it must only get calls
 235  *      with matching cud.
 236  */
 237 static struct sock *x25_find_listener(struct x25_address *addr,
 238                                         struct sk_buff *skb)
 239 {
 240         struct sock *s;
 241         struct sock *next_best;
 242         struct hlist_node *node;
 243
 244         read_lock_bh(&x25_list_lock);
 245         next_best = NULL;
 246
 247         sk_for_each(s, node, &x25_list)
 248                 if ((!strcmp(addr->x25_addr,
 249                         x25_sk(s)->source_addr.x25_addr) ||
 250                                 !strcmp(addr->x25_addr,
 251                                         null_x25_address.x25_addr)) &&
 252                                         s->sk_state == TCP_LISTEN) {
 253                         /*
 254                          * Found a listening socket, now check the incoming
 255                          * call user data vs this sockets call user data
 256                          */
 257                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 258                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 259                                         skb->data,
 260                                         x25_sk(s)->cudmatchlength)) == 0) {
 261                                         sock_hold(s);
 262                                         goto found;
 263                                  }
 264                         } else
 265                                 next_best = s;
 266                 }
 267         if (next_best) {
 268                 s = next_best;
 269                 sock_hold(s);
 270                 goto found;
 271         }
 272         s = NULL;
 273 found:
 274         read_unlock_bh(&x25_list_lock);
 275         return s;
 276 }
 277
 278 /*
 279  *      Find a connected X.25 socket given my LCI and neighbour.
 280  */
 281 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 282 {
 283         struct sock *s;
 284         struct hlist_node *node;
 285
 286         sk_for_each(s, node, &x25_list)
 287                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 288                         sock_hold(s);
 289                         goto found;
 290                 }
 291         s = NULL;
 292 found:
 293         return s;
 294 }
 295
 296 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 297 {
 298         struct sock *s;
 299
 300         read_lock_bh(&x25_list_lock);
 301         s = __x25_find_socket(lci, nb);
 302         read_unlock_bh(&x25_list_lock);
 303         return s;
 304 }
 305
 306 /*
 307  *      Find a unique LCI for a given device.
 308  */
 309 static unsigned int x25_new_lci(struct x25_neigh *nb)
 310 {
 311         unsigned int lci = 1;
 312         struct sock *sk;
 313
 314         read_lock_bh(&x25_list_lock);
 315
 316         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 317                 sock_put(sk);
 318                 if (++lci == 4096) {
 319                         lci = 0;
 320                         break;
 321                 }
 322         }
 323
 324         read_unlock_bh(&x25_list_lock);
 325         return lci;
 326 }
 327
 328 /*
 329  *      Deferred destroy.
 330  */
 331 void x25_destroy_socket(struct sock *);
 332
 333 /*
 334  *      handler for deferred kills.
 335  */
 336 static void x25_destroy_timer(unsigned long data)
 337 {
 338         x25_destroy_socket((struct sock *)data);
 339 }
 340
 341 /*
 342  *      This is called from user mode and the timers. Thus it protects itself
 343  *      against interrupt users but doesn't worry about being called during
 344  *      work. Once it is removed from the queue no interrupt or bottom half
 345  *      will touch it and we are (fairly 8-) ) safe.
 346  *      Not static as it's used by the timer
 347  */
 348 void x25_destroy_socket(struct sock *sk)
 349 {
 350         struct sk_buff *skb;
 351
 352         sock_hold(sk);
 353         lock_sock(sk);
 354         x25_stop_heartbeat(sk);
 355         x25_stop_timer(sk);
 356
 357         x25_remove_socket(sk);
 358         x25_clear_queues(sk);           /* Flush the queues */
 359
 360         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 361                 if (skb->sk != sk) {            /* A pending connection */
 362                         /*
 363                          * Queue the unaccepted socket for death
 364                          */
 365                         sock_set_flag(skb->sk, SOCK_DEAD);
 366                         x25_start_heartbeat(skb->sk);
 367                         x25_sk(skb->sk)->state = X25_STATE_0;
 368                 }
 369
 370                 kfree_skb(skb);
 371         }
 372
 373         if (atomic_read(&sk->sk_wmem_alloc) ||
 374             atomic_read(&sk->sk_rmem_alloc)) {
 375                 /* Defer: outstanding buffers */
 376                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 377                 sk->sk_timer.function = x25_destroy_timer;
 378                 sk->sk_timer.data = (unsigned long)sk;
 379                 add_timer(&sk->sk_timer);
 380         } else {
 381                 /* drop last reference so sock_put will free */
 382                 __sock_put(sk);
 383         }
 384
 385         release_sock(sk);
 386         sock_put(sk);
 387 }
 388
 389 /*
 390  *      Handling for system calls applied via the various interfaces to a
 391  *      X.25 socket object.
 392  */
 393
 394 static int x25_setsockopt(struct socket *sock, int level, int optname,
 395                           char __user *optval, int optlen)
 396 {
 397         int opt;
 398         struct sock *sk = sock->sk;
 399         int rc = -ENOPROTOOPT;
 400
 401         if (level != SOL_X25 || optname != X25_QBITINCL)
 402                 goto out;
 403
 404         rc = -EINVAL;
 405         if (optlen < sizeof(int))
 406                 goto out;
 407
 408         rc = -EFAULT;
 409         if (get_user(opt, (int __user *)optval))
 410                 goto out;
 411
 412         x25_sk(sk)->qbitincl = !!opt;
 413         rc = 0;
 414 out:
 415         return rc;
 416 }
 417
 418 static int x25_getsockopt(struct socket *sock, int level, int optname,
 419                           char __user *optval, int __user *optlen)
 420 {
 421         struct sock *sk = sock->sk;
 422         int val, len, rc = -ENOPROTOOPT;
 423
 424         if (level != SOL_X25 || optname != X25_QBITINCL)
 425                 goto out;
 426
 427         rc = -EFAULT;
 428         if (get_user(len, optlen))
 429                 goto out;
 430
 431         len = min_t(unsigned int, len, sizeof(int));
 432
 433         rc = -EINVAL;
 434         if (len < 0)
 435                 goto out;
 436
 437         rc = -EFAULT;
 438         if (put_user(len, optlen))
 439                 goto out;
 440
 441         val = x25_sk(sk)->qbitincl;
 442         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 443 out:
 444         return rc;
 445 }
 446
 447 static int x25_listen(struct socket *sock, int backlog)
 448 {
 449         struct sock *sk = sock->sk;
 450         int rc = -EOPNOTSUPP;
 451
 452         if (sk->sk_state != TCP_LISTEN) {
 453                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 454                 sk->sk_max_ack_backlog = backlog;
 455                 sk->sk_state           = TCP_LISTEN;
 456                 rc = 0;
 457         }
 458
 459         return rc;
 460 }
 461
 462 static struct proto x25_proto = {
 463         .name     = "X25",
 464         .owner    = THIS_MODULE,
 465         .obj_size = sizeof(struct x25_sock),
 466 };
 467
 468 static struct sock *x25_alloc_socket(void)
 469 {
 470         struct x25_sock *x25;
 471         struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
 472
 473         if (!sk)
 474                 goto out;
 475
 476         sock_init_data(NULL, sk);
 477
 478         x25 = x25_sk(sk);
 479         skb_queue_head_init(&x25->ack_queue);
 480         skb_queue_head_init(&x25->fragment_queue);
 481         skb_queue_head_init(&x25->interrupt_in_queue);
 482         skb_queue_head_init(&x25->interrupt_out_queue);
 483 out:
 484         return sk;
 485 }
 486
 487 static int x25_create(struct socket *sock, int protocol)
 488 {
 489         struct sock *sk;
 490         struct x25_sock *x25;
 491         int rc = -ESOCKTNOSUPPORT;
 492
 493         if (sock->type != SOCK_SEQPACKET || protocol)
 494                 goto out;
 495
 496         rc = -ENOMEM;
 497         if ((sk = x25_alloc_socket()) == NULL)
 498                 goto out;
 499
 500         x25 = x25_sk(sk);
 501
 502         sk->sk_socket = sock;
 503         sk->sk_type = sock->type;
 504         sk->sk_sleep = &sock->wait;
 505         sock->sk = sk;
 506
 507         x25_init_timers(sk);
 508
 509         sock->ops    = &x25_proto_ops;
 510         sk->sk_protocol = protocol;
 511         sk->sk_backlog_rcv = x25_backlog_rcv;
 512
 513         x25->t21   = sysctl_x25_call_request_timeout;
 514         x25->t22   = sysctl_x25_reset_request_timeout;
 515         x25->t23   = sysctl_x25_clear_request_timeout;
 516         x25->t2    = sysctl_x25_ack_holdback_timeout;
 517         x25->state = X25_STATE_0;
 518         x25->cudmatchlength = 0;
 519         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 520                                                         /* on call accept   */
 521
 522         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 523         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 524         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 525         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 526         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 527         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 528         x25->dte_facilities.calling_len = 0;
 529         x25->dte_facilities.called_len = 0;
 530         memset(x25->dte_facilities.called_ae, '\0',
 531                         sizeof(x25->dte_facilities.called_ae));
 532         memset(x25->dte_facilities.calling_ae, '\0',
 533                         sizeof(x25->dte_facilities.calling_ae));
 534
 535         rc = 0;
 536 out:
 537         return rc;
 538 }
 539
 540 static struct sock *x25_make_new(struct sock *osk)
 541 {
 542         struct sock *sk = NULL;
 543         struct x25_sock *x25, *ox25;
 544
 545         if (osk->sk_type != SOCK_SEQPACKET)
 546                 goto out;
 547
 548         if ((sk = x25_alloc_socket()) == NULL)
 549                 goto out;
 550
 551         x25 = x25_sk(sk);
 552
 553         sk->sk_type        = osk->sk_type;
 554         sk->sk_socket      = osk->sk_socket;
 555         sk->sk_priority    = osk->sk_priority;
 556         sk->sk_protocol    = osk->sk_protocol;
 557         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 558         sk->sk_sndbuf      = osk->sk_sndbuf;
 559         sk->sk_state       = TCP_ESTABLISHED;
 560         sk->sk_sleep       = osk->sk_sleep;
 561         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 562         sock_copy_flags(sk, osk);
 563
 564         ox25 = x25_sk(osk);
 565         x25->t21        = ox25->t21;
 566         x25->t22        = ox25->t22;
 567         x25->t23        = ox25->t23;
 568         x25->t2         = ox25->t2;
 569         x25->facilities = ox25->facilities;
 570         x25->qbitincl   = ox25->qbitincl;
 571         x25->dte_facilities = ox25->dte_facilities;
 572         x25->cudmatchlength = ox25->cudmatchlength;
 573         x25->accptapprv = ox25->accptapprv;
 574
 575         x25_init_timers(sk);
 576 out:
 577         return sk;
 578 }
 579
 580 static int x25_release(struct socket *sock)
 581 {
 582         struct sock *sk = sock->sk;
 583         struct x25_sock *x25;
 584
 585         if (!sk)
 586                 goto out;
 587
 588         x25 = x25_sk(sk);
 589
 590         switch (x25->state) {
 591
 592                 case X25_STATE_0:
 593                 case X25_STATE_2:
 594                         x25_disconnect(sk, 0, 0, 0);
 595                         x25_destroy_socket(sk);
 596                         goto out;
 597
 598                 case X25_STATE_1:
 599                 case X25_STATE_3:
 600                 case X25_STATE_4:
 601                         x25_clear_queues(sk);
 602                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 603                         x25_start_t23timer(sk);
 604                         x25->state = X25_STATE_2;
 605                         sk->sk_state    = TCP_CLOSE;
 606                         sk->sk_shutdown |= SEND_SHUTDOWN;
 607                         sk->sk_state_change(sk);
 608                         sock_set_flag(sk, SOCK_DEAD);
 609                         sock_set_flag(sk, SOCK_DESTROY);
 610                         break;
 611         }
 612
 613         sock->sk        = NULL;
 614         sk->sk_socket   = NULL; /* Not used, but we should do this */
 615 out:
 616         return 0;
 617 }
 618
 619 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 620 {
 621         struct sock *sk = sock->sk;
 622         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 623
 624         if (!sock_flag(sk, SOCK_ZAPPED) ||
 625             addr_len != sizeof(struct sockaddr_x25) ||
 626             addr->sx25_family != AF_X25)
 627                 return -EINVAL;
 628
 629         x25_sk(sk)->source_addr = addr->sx25_addr;
 630         x25_insert_socket(sk);
 631         sock_reset_flag(sk, SOCK_ZAPPED);
 632         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 633
 634         return 0;
 635 }
 636
 637 static int x25_wait_for_connection_establishment(struct sock *sk)
 638 {
 639         DECLARE_WAITQUEUE(wait, current);
 640         int rc;
 641
 642         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 643         for (;;) {
 644                 __set_current_state(TASK_INTERRUPTIBLE);
 645                 rc = -ERESTARTSYS;
 646                 if (signal_pending(current))
 647                         break;
 648                 rc = sock_error(sk);
 649                 if (rc) {
 650                         sk->sk_socket->state = SS_UNCONNECTED;
 651                         break;
 652                 }
 653                 rc = 0;
 654                 if (sk->sk_state != TCP_ESTABLISHED) {
 655                         release_sock(sk);
 656                         schedule();
 657                         lock_sock(sk);
 658                 } else
 659                         break;
 660         }
 661         __set_current_state(TASK_RUNNING);
 662         remove_wait_queue(sk->sk_sleep, &wait);
 663         return rc;
 664 }
 665
 666 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 667                        int addr_len, int flags)
 668 {
 669         struct sock *sk = sock->sk;
 670         struct x25_sock *x25 = x25_sk(sk);
 671         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 672         struct x25_route *rt;
 673         int rc = 0;
 674
 675         lock_sock(sk);
 676         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 677                 sock->state = SS_CONNECTED;
 678                 goto out; /* Connect completed during a ERESTARTSYS event */
 679         }
 680
 681         rc = -ECONNREFUSED;
 682         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 683                 sock->state = SS_UNCONNECTED;
 684                 goto out;
 685         }
 686
 687         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 688         if (sk->sk_state == TCP_ESTABLISHED)
 689                 goto out;
 690
 691         sk->sk_state   = TCP_CLOSE;
 692         sock->state = SS_UNCONNECTED;
 693
 694         rc = -EINVAL;
 695         if (addr_len != sizeof(struct sockaddr_x25) ||
 696             addr->sx25_family != AF_X25)
 697                 goto out;
 698
 699         rc = -ENETUNREACH;
 700         rt = x25_get_route(&addr->sx25_addr);
 701         if (!rt)
 702                 goto out;
 703
 704         x25->neighbour = x25_get_neigh(rt->dev);
 705         if (!x25->neighbour)
 706                 goto out_put_route;
 707
 708         x25_limit_facilities(&x25->facilities, x25->neighbour);
 709
 710         x25->lci = x25_new_lci(x25->neighbour);
 711         if (!x25->lci)
 712                 goto out_put_neigh;
 713
 714         rc = -EINVAL;
 715         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 716                 goto out_put_neigh;
 717
 718         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 719                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 720
 721         x25->dest_addr = addr->sx25_addr;
 722
 723         /* Move to connecting socket, start sending Connect Requests */
 724         sock->state   = SS_CONNECTING;
 725         sk->sk_state  = TCP_SYN_SENT;
 726
 727         x25->state = X25_STATE_1;
 728
 729         x25_write_internal(sk, X25_CALL_REQUEST);
 730
 731         x25_start_heartbeat(sk);
 732         x25_start_t21timer(sk);
 733
 734         /* Now the loop */
 735         rc = -EINPROGRESS;
 736         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 737                 goto out_put_neigh;
 738
 739         rc = x25_wait_for_connection_establishment(sk);
 740         if (rc)
 741                 goto out_put_neigh;
 742
 743         sock->state = SS_CONNECTED;
 744         rc = 0;
 745 out_put_neigh:
 746         if (rc)
 747                 x25_neigh_put(x25->neighbour);
 748 out_put_route:
 749         x25_route_put(rt);
 750 out:
 751         release_sock(sk);
 752         return rc;
 753 }
 754
 755 static int x25_wait_for_data(struct sock *sk, long timeout)
 756 {
 757         DECLARE_WAITQUEUE(wait, current);
 758         int rc = 0;
 759
 760         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 761         for (;;) {
 762                 __set_current_state(TASK_INTERRUPTIBLE);
 763                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 764                         break;
 765                 rc = -ERESTARTSYS;
 766                 if (signal_pending(current))
 767                         break;
 768                 rc = -EAGAIN;
 769                 if (!timeout)
 770                         break;
 771                 rc = 0;
 772                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 773                         release_sock(sk);
 774                         timeout = schedule_timeout(timeout);
 775                         lock_sock(sk);
 776                 } else
 777                         break;
 778         }
 779         __set_current_state(TASK_RUNNING);
 780         remove_wait_queue(sk->sk_sleep, &wait);
 781         return rc;
 782 }
 783
 784 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 785 {
 786         struct sock *sk = sock->sk;
 787         struct sock *newsk;
 788         struct sk_buff *skb;
 789         int rc = -EINVAL;
 790
 791         if (!sk || sk->sk_state != TCP_LISTEN)
 792                 goto out;
 793
 794         rc = -EOPNOTSUPP;
 795         if (sk->sk_type != SOCK_SEQPACKET)
 796                 goto out;
 797
 798         lock_sock(sk);
 799         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 800         if (rc)
 801                 goto out2;
 802         skb = skb_dequeue(&sk->sk_receive_queue);
 803         rc = -EINVAL;
 804         if (!skb->sk)
 805                 goto out2;
 806         newsk            = skb->sk;
 807         newsk->sk_socket = newsock;
 808         newsk->sk_sleep  = &newsock->wait;
 809
 810         /* Now attach up the new socket */
 811         skb->sk = NULL;
 812         kfree_skb(skb);
 813         sk->sk_ack_backlog--;
 814         newsock->sk    = newsk;
 815         newsock->state = SS_CONNECTED;
 816         rc = 0;
 817 out2:
 818         release_sock(sk);
 819 out:
 820         return rc;
 821 }
 822
 823 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 824                        int *uaddr_len, int peer)
 825 {
 826         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 827         struct sock *sk = sock->sk;
 828         struct x25_sock *x25 = x25_sk(sk);
 829
 830         if (peer) {
 831                 if (sk->sk_state != TCP_ESTABLISHED)
 832                         return -ENOTCONN;
 833                 sx25->sx25_addr = x25->dest_addr;
 834         } else
 835                 sx25->sx25_addr = x25->source_addr;
 836
 837         sx25->sx25_family = AF_X25;
 838         *uaddr_len = sizeof(*sx25);
 839
 840         return 0;
 841 }
 842
 843 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 844                         unsigned int lci)
 845 {
 846         struct sock *sk;
 847         struct sock *make;
 848         struct x25_sock *makex25;
 849         struct x25_address source_addr, dest_addr;
 850         struct x25_facilities facilities;
 851         struct x25_dte_facilities dte_facilities;
 852         int len, rc;
 853
 854         /*
 855          *      Remove the LCI and frame type.
 856          */
 857         skb_pull(skb, X25_STD_MIN_LEN);
 858
 859         /*
 860          *      Extract the X.25 addresses and convert them to ASCII strings,
 861          *      and remove them.
 862          */
 863         skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
 864
 865         /*
 866          *      Get the length of the facilities, skip past them for the moment
 867          *      get the call user data because this is needed to determine
 868          *      the correct listener
 869          */
 870         len = skb->data[0] + 1;
 871         skb_pull(skb,len);
 872
 873         /*
 874          *      Find a listener for the particular address/cud pair.
 875          */
 876         sk = x25_find_listener(&source_addr,skb);
 877         skb_push(skb,len);
 878
 879         /*
 880          *      We can't accept the Call Request.
 881          */
 882         if (sk == NULL || sk_acceptq_is_full(sk))
 883                 goto out_clear_request;
 884
 885         /*
 886          *      Try to reach a compromise on the requested facilities.
 887          */
 888         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 889         if (len == -1)
 890                 goto out_sock_put;
 891
 892         /*
 893          * current neighbour/link might impose additional limits
 894          * on certain facilties
 895          */
 896
 897         x25_limit_facilities(&facilities, nb);
 898
 899         /*
 900          *      Try to create a new socket.
 901          */
 902         make = x25_make_new(sk);
 903         if (!make)
 904                 goto out_sock_put;
 905
 906         /*
 907          *      Remove the facilities
 908          */
 909         skb_pull(skb, len);
 910
 911         skb->sk     = make;
 912         make->sk_state = TCP_ESTABLISHED;
 913
 914         makex25 = x25_sk(make);
 915         makex25->lci           = lci;
 916         makex25->dest_addr     = dest_addr;
 917         makex25->source_addr   = source_addr;
 918         makex25->neighbour     = nb;
 919         makex25->facilities    = facilities;
 920         makex25->dte_facilities= dte_facilities;
 921         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 922         /* ensure no reverse facil on accept */
 923         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 924         /* ensure no calling address extension on accept */
 925         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 926         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 927
 928         /* Normally all calls are accepted immediatly */
 929         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 930                 x25_write_internal(make, X25_CALL_ACCEPTED);
 931                 makex25->state = X25_STATE_3;
 932         }
 933
 934         /*
 935          *      Incoming Call User Data.
 936          */
 937         if (skb->len >= 0) {
 938                 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
 939                 makex25->calluserdata.cudlength = skb->len;
 940         }
 941
 942         sk->sk_ack_backlog++;
 943
 944         x25_insert_socket(make);
 945
 946         skb_queue_head(&sk->sk_receive_queue, skb);
 947
 948         x25_start_heartbeat(make);
 949
 950         if (!sock_flag(sk, SOCK_DEAD))
 951                 sk->sk_data_ready(sk, skb->len);
 952         rc = 1;
 953         sock_put(sk);
 954 out:
 955         return rc;
 956 out_sock_put:
 957         sock_put(sk);
 958 out_clear_request:
 959         rc = 0;
 960         x25_transmit_clear_request(nb, lci, 0x01);
 961         goto out;
 962 }
 963
 964 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 965                        struct msghdr *msg, size_t len)
 966 {
 967         struct sock *sk = sock->sk;
 968         struct x25_sock *x25 = x25_sk(sk);
 969         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 970         struct sockaddr_x25 sx25;
 971         struct sk_buff *skb;
 972         unsigned char *asmptr;
 973         int noblock = msg->msg_flags & MSG_DONTWAIT;
 974         size_t size;
 975         int qbit = 0, rc = -EINVAL;
 976
 977         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 978                 goto out;
 979
 980         /* we currently don't support segmented records at the user interface */
 981         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 982                 goto out;
 983
 984         rc = -EADDRNOTAVAIL;
 985         if (sock_flag(sk, SOCK_ZAPPED))
 986                 goto out;
 987
 988         rc = -EPIPE;
 989         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 990                 send_sig(SIGPIPE, current, 0);
 991                 goto out;
 992         }
 993
 994         rc = -ENETUNREACH;
 995         if (!x25->neighbour)
 996                 goto out;
 997
 998         if (usx25) {
 999                 rc = -EINVAL;
1000                 if (msg->msg_namelen < sizeof(sx25))
1001                         goto out;
1002                 memcpy(&sx25, usx25, sizeof(sx25));
1003                 rc = -EISCONN;
1004                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1005                         goto out;
1006                 rc = -EINVAL;
1007                 if (sx25.sx25_family != AF_X25)
1008                         goto out;
1009         } else {
1010                 /*
1011                  *      FIXME 1003.1g - if the socket is like this because
1012                  *      it has become closed (not started closed) we ought
1013                  *      to SIGPIPE, EPIPE;
1014                  */
1015                 rc = -ENOTCONN;
1016                 if (sk->sk_state != TCP_ESTABLISHED)
1017                         goto out;
1018
1019                 sx25.sx25_family = AF_X25;
1020                 sx25.sx25_addr   = x25->dest_addr;
1021         }
1022
1023         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1024
1025         /* Build a packet */
1026         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1027
1028         if ((msg->msg_flags & MSG_OOB) && len > 32)
1029                 len = 32;
1030
1031         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1032
1033         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1034         if (!skb)
1035                 goto out;
1036         X25_SKB_CB(skb)->flags = msg->msg_flags;
1037
1038         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1039
1040         /*
1041          *      Put the data on the end
1042          */
1043         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1044
1045         asmptr = skb->h.raw = skb_put(skb, len);
1046
1047         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1048         if (rc)
1049                 goto out_kfree_skb;
1050
1051         /*
1052          *      If the Q BIT Include socket option is in force, the first
1053          *      byte of the user data is the logical value of the Q Bit.
1054          */
1055         if (x25->qbitincl) {
1056                 qbit = skb->data[0];
1057                 skb_pull(skb, 1);
1058         }
1059
1060         /*
1061          *      Push down the X.25 header
1062          */
1063         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1064
1065         if (msg->msg_flags & MSG_OOB) {
1066                 if (x25->neighbour->extended) {
1067                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1068                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1069                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1070                         *asmptr++ = X25_INTERRUPT;
1071                 } else {
1072                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1073                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1074                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1075                         *asmptr++ = X25_INTERRUPT;
1076                 }
1077         } else {
1078                 if (x25->neighbour->extended) {
1079                         /* Build an Extended X.25 header */
1080                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1081                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1082                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1083                         *asmptr++ = X25_DATA;
1084                         *asmptr++ = X25_DATA;
1085                 } else {
1086                         /* Build an Standard X.25 header */
1087                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1088                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1089                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1090                         *asmptr++ = X25_DATA;
1091                 }
1092
1093                 if (qbit)
1094                         skb->data[0] |= X25_Q_BIT;
1095         }
1096
1097         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1098         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1099
1100         rc = -ENOTCONN;
1101         if (sk->sk_state != TCP_ESTABLISHED)
1102                 goto out_kfree_skb;
1103
1104         if (msg->msg_flags & MSG_OOB)
1105                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1106         else {
1107                 len = x25_output(sk, skb);
1108                 if (len < 0)
1109                         kfree_skb(skb);
1110                 else if (x25->qbitincl)
1111                         len++;
1112         }
1113
1114         /*
1115          * lock_sock() is currently only used to serialize this x25_kick()
1116          * against input-driven x25_kick() calls. It currently only blocks
1117          * incoming packets for this socket and does not protect against
1118          * any other socket state changes and is not called from anywhere
1119          * else. As x25_kick() cannot block and as long as all socket
1120          * operations are BKL-wrapped, we don't need take to care about
1121          * purging the backlog queue in x25_release().
1122          *
1123          * Using lock_sock() to protect all socket operations entirely
1124          * (and making the whole x25 stack SMP aware) unfortunately would
1125          * require major changes to {send,recv}msg and skb allocation methods.
1126          * -> 2.5 ;)
1127          */
1128         lock_sock(sk);
1129         x25_kick(sk);
1130         release_sock(sk);
1131         rc = len;
1132 out:
1133         return rc;
1134 out_kfree_skb:
1135         kfree_skb(skb);
1136         goto out;
1137 }
1138
1139
1140 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1141                        struct msghdr *msg, size_t size,
1142                        int flags)
1143 {
1144         struct sock *sk = sock->sk;
1145         struct x25_sock *x25 = x25_sk(sk);
1146         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1147         size_t copied;
1148         int qbit;
1149         struct sk_buff *skb;
1150         unsigned char *asmptr;
1151         int rc = -ENOTCONN;
1152
1153         /*
1154          * This works for seqpacket too. The receiver has ordered the queue for
1155          * us! We do one quick check first though
1156          */
1157         if (sk->sk_state != TCP_ESTABLISHED)
1158                 goto out;
1159
1160         if (flags & MSG_OOB) {
1161                 rc = -EINVAL;
1162                 if (sock_flag(sk, SOCK_URGINLINE) ||
1163                     !skb_peek(&x25->interrupt_in_queue))
1164                         goto out;
1165
1166                 skb = skb_dequeue(&x25->interrupt_in_queue);
1167
1168                 skb_pull(skb, X25_STD_MIN_LEN);
1169
1170                 /*
1171                  *      No Q bit information on Interrupt data.
1172                  */
1173                 if (x25->qbitincl) {
1174                         asmptr  = skb_push(skb, 1);
1175                         *asmptr = 0x00;
1176                 }
1177
1178                 msg->msg_flags |= MSG_OOB;
1179         } else {
1180                 /* Now we can treat all alike */
1181                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1182                                         flags & MSG_DONTWAIT, &rc);
1183                 if (!skb)
1184                         goto out;
1185
1186                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1187
1188                 skb_pull(skb, x25->neighbour->extended ?
1189                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1190
1191                 if (x25->qbitincl) {
1192                         asmptr  = skb_push(skb, 1);
1193                         *asmptr = qbit;
1194                 }
1195         }
1196
1197         skb->h.raw = skb->data;
1198
1199         copied = skb->len;
1200
1201         if (copied > size) {
1202                 copied = size;
1203                 msg->msg_flags |= MSG_TRUNC;
1204         }
1205
1206         /* Currently, each datagram always contains a complete record */
1207         msg->msg_flags |= MSG_EOR;
1208
1209         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1210         if (rc)
1211                 goto out_free_dgram;
1212
1213         if (sx25) {
1214                 sx25->sx25_family = AF_X25;
1215                 sx25->sx25_addr   = x25->dest_addr;
1216         }
1217
1218         msg->msg_namelen = sizeof(struct sockaddr_x25);
1219
1220         lock_sock(sk);
1221         x25_check_rbuf(sk);
1222         release_sock(sk);
1223         rc = copied;
1224 out_free_dgram:
1225         skb_free_datagram(sk, skb);
1226 out:
1227         return rc;
1228 }
1229
1230
1231 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1232 {
1233         struct sock *sk = sock->sk;
1234         struct x25_sock *x25 = x25_sk(sk);
1235         void __user *argp = (void __user *)arg;
1236         int rc;
1237
1238         switch (cmd) {
1239                 case TIOCOUTQ: {
1240                         int amount = sk->sk_sndbuf -
1241                                      atomic_read(&sk->sk_wmem_alloc);
1242                         if (amount < 0)
1243                                 amount = 0;
1244                         rc = put_user(amount, (unsigned int __user *)argp);
1245                         break;
1246                 }
1247
1248                 case TIOCINQ: {
1249                         struct sk_buff *skb;
1250                         int amount = 0;
1251                         /*
1252                          * These two are safe on a single CPU system as
1253                          * only user tasks fiddle here
1254                          */
1255                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1256                                 amount = skb->len;
1257                         rc = put_user(amount, (unsigned int __user *)argp);
1258                         break;
1259                 }
1260
1261                 case SIOCGSTAMP:
1262                         rc = -EINVAL;
1263                         if (sk)
1264                                 rc = sock_get_timestamp(sk,
1265                                                 (struct timeval __user *)argp);
1266                         break;
1267                 case SIOCGIFADDR:
1268                 case SIOCSIFADDR:
1269                 case SIOCGIFDSTADDR:
1270                 case SIOCSIFDSTADDR:
1271                 case SIOCGIFBRDADDR:
1272                 case SIOCSIFBRDADDR:
1273                 case SIOCGIFNETMASK:
1274                 case SIOCSIFNETMASK:
1275                 case SIOCGIFMETRIC:
1276                 case SIOCSIFMETRIC:
1277                         rc = -EINVAL;
1278                         break;
1279                 case SIOCADDRT:
1280                 case SIOCDELRT:
1281                         rc = -EPERM;
1282                         if (!capable(CAP_NET_ADMIN))
1283                                 break;
1284                         rc = x25_route_ioctl(cmd, argp);
1285                         break;
1286                 case SIOCX25GSUBSCRIP:
1287                         rc = x25_subscr_ioctl(cmd, argp);
1288                         break;
1289                 case SIOCX25SSUBSCRIP:
1290                         rc = -EPERM;
1291                         if (!capable(CAP_NET_ADMIN))
1292                                 break;
1293                         rc = x25_subscr_ioctl(cmd, argp);
1294                         break;
1295                 case SIOCX25GFACILITIES: {
1296                         struct x25_facilities fac = x25->facilities;
1297                         rc = copy_to_user(argp, &fac,
1298                                           sizeof(fac)) ? -EFAULT : 0;
1299                         break;
1300                 }
1301
1302                 case SIOCX25SFACILITIES: {
1303                         struct x25_facilities facilities;
1304                         rc = -EFAULT;
1305                         if (copy_from_user(&facilities, argp,
1306                                            sizeof(facilities)))
1307                                 break;
1308                         rc = -EINVAL;
1309                         if (sk->sk_state != TCP_LISTEN &&
1310                             sk->sk_state != TCP_CLOSE)
1311                                 break;
1312                         if (facilities.pacsize_in < X25_PS16 ||
1313                             facilities.pacsize_in > X25_PS4096)
1314                                 break;
1315                         if (facilities.pacsize_out < X25_PS16 ||
1316                             facilities.pacsize_out > X25_PS4096)
1317                                 break;
1318                         if (facilities.winsize_in < 1 ||
1319                             facilities.winsize_in > 127)
1320                                 break;
1321                         if (facilities.throughput < 0x03 ||
1322                             facilities.throughput > 0xDD)
1323                                 break;
1324                         if (facilities.reverse &&
1325                                 (facilities.reverse | 0x81)!= 0x81)
1326                                 break;
1327                         x25->facilities = facilities;
1328                         rc = 0;
1329                         break;
1330                 }
1331
1332                 case SIOCX25GDTEFACILITIES: {
1333                         rc = copy_to_user(argp, &x25->dte_facilities,
1334                                                 sizeof(x25->dte_facilities));
1335                         if (rc)
1336                                 rc = -EFAULT;
1337                         break;
1338                 }
1339
1340                 case SIOCX25SDTEFACILITIES: {
1341                         struct x25_dte_facilities dtefacs;
1342                         rc = -EFAULT;
1343                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1344                                 break;
1345                         rc = -EINVAL;
1346                         if (sk->sk_state != TCP_LISTEN &&
1347                                         sk->sk_state != TCP_CLOSE)
1348                                 break;
1349                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1350                                 break;
1351                         if (dtefacs.calling_ae == NULL)
1352                                 break;
1353                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1354                                 break;
1355                         if (dtefacs.called_ae == NULL)
1356                                 break;
1357                         x25->dte_facilities = dtefacs;
1358                         rc = 0;
1359                         break;
1360                 }
1361
1362                 case SIOCX25GCALLUSERDATA: {
1363                         struct x25_calluserdata cud = x25->calluserdata;
1364                         rc = copy_to_user(argp, &cud,
1365                                           sizeof(cud)) ? -EFAULT : 0;
1366                         break;
1367                 }
1368
1369                 case SIOCX25SCALLUSERDATA: {
1370                         struct x25_calluserdata calluserdata;
1371
1372                         rc = -EFAULT;
1373                         if (copy_from_user(&calluserdata, argp,
1374                                            sizeof(calluserdata)))
1375                                 break;
1376                         rc = -EINVAL;
1377                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1378                                 break;
1379                         x25->calluserdata = calluserdata;
1380                         rc = 0;
1381                         break;
1382                 }
1383
1384                 case SIOCX25GCAUSEDIAG: {
1385                         struct x25_causediag causediag;
1386                         causediag = x25->causediag;
1387                         rc = copy_to_user(argp, &causediag,
1388                                           sizeof(causediag)) ? -EFAULT : 0;
1389                         break;
1390                 }
1391
1392                 case SIOCX25SCUDMATCHLEN: {
1393                         struct x25_subaddr sub_addr;
1394                         rc = -EINVAL;
1395                         if(sk->sk_state != TCP_CLOSE)
1396                                 break;
1397                         rc = -EFAULT;
1398                         if (copy_from_user(&sub_addr, argp,
1399                                         sizeof(sub_addr)))
1400                                 break;
1401                         rc = -EINVAL;
1402                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1403                                 break;
1404                         x25->cudmatchlength = sub_addr.cudmatchlength;
1405                         rc = 0;
1406                         break;
1407                 }
1408
1409                 case SIOCX25CALLACCPTAPPRV: {
1410                         rc = -EINVAL;
1411                         if (sk->sk_state != TCP_CLOSE)
1412                                 break;
1413                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1414                         rc = 0;
1415                         break;
1416                 }
1417
1418                 case SIOCX25SENDCALLACCPT:  {
1419                         rc = -EINVAL;
1420                         if (sk->sk_state != TCP_ESTABLISHED)
1421                                 break;
1422                         if (x25->accptapprv)    /* must call accptapprv above */
1423                                 break;
1424                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1425                         x25->state = X25_STATE_3;
1426                         rc = 0;
1427                         break;
1428                 }
1429
1430                 default:
1431                         rc = -ENOIOCTLCMD;
1432                         break;
1433         }
1434
1435         return rc;
1436 }
1437
1438 static struct net_proto_family x25_family_ops = {
1439         .family =       AF_X25,
1440         .create =       x25_create,
1441         .owner  =       THIS_MODULE,
1442 };
1443
1444 #ifdef CONFIG_COMPAT
1445 static int compat_x25_subscr_ioctl(unsigned int cmd,
1446                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1447 {
1448         struct compat_x25_subscrip_struct x25_subscr;
1449         struct x25_neigh *nb;
1450         struct net_device *dev;
1451         int rc = -EINVAL;
1452
1453         rc = -EFAULT;
1454         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1455                 goto out;
1456
1457         rc = -EINVAL;
1458         dev = x25_dev_get(x25_subscr.device);
1459         if (dev == NULL)
1460                 goto out;
1461
1462         nb = x25_get_neigh(dev);
1463         if (nb == NULL)
1464                 goto out_dev_put;
1465
1466         dev_put(dev);
1467
1468         if (cmd == SIOCX25GSUBSCRIP) {
1469                 x25_subscr.extended = nb->extended;
1470                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1471                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1472                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1473         } else {
1474                 rc = -EINVAL;
1475                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1476                         rc = 0;
1477                         nb->extended = x25_subscr.extended;
1478                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1479                 }
1480         }
1481         x25_neigh_put(nb);
1482 out:
1483         return rc;
1484 out_dev_put:
1485         dev_put(dev);
1486         goto out;
1487 }
1488
1489 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1490                                 unsigned long arg)
1491 {
1492         void __user *argp = compat_ptr(arg);
1493         struct sock *sk = sock->sk;
1494
1495         int rc = -ENOIOCTLCMD;
1496
1497         switch(cmd) {
1498         case TIOCOUTQ:
1499         case TIOCINQ:
1500                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1501                 break;
1502         case SIOCGSTAMP:
1503                 rc = -EINVAL;
1504                 if (sk)
1505                         rc = compat_sock_get_timestamp(sk,
1506                                         (struct timeval __user*)argp);
1507                 break;
1508         case SIOCGIFADDR:
1509         case SIOCSIFADDR:
1510         case SIOCGIFDSTADDR:
1511         case SIOCSIFDSTADDR:
1512         case SIOCGIFBRDADDR:
1513         case SIOCSIFBRDADDR:
1514         case SIOCGIFNETMASK:
1515         case SIOCSIFNETMASK:
1516         case SIOCGIFMETRIC:
1517         case SIOCSIFMETRIC:
1518                 rc = -EINVAL;
1519                 break;
1520         case SIOCADDRT:
1521         case SIOCDELRT:
1522                 rc = -EPERM;
1523                 if (!capable(CAP_NET_ADMIN))
1524                         break;
1525                 rc = x25_route_ioctl(cmd, argp);
1526                 break;
1527         case SIOCX25GSUBSCRIP:
1528                 rc = compat_x25_subscr_ioctl(cmd, argp);
1529                 break;
1530         case SIOCX25SSUBSCRIP:
1531                 rc = -EPERM;
1532                 if (!capable(CAP_NET_ADMIN))
1533                         break;
1534                 rc = compat_x25_subscr_ioctl(cmd, argp);
1535                 break;
1536         case SIOCX25GFACILITIES:
1537         case SIOCX25SFACILITIES:
1538         case SIOCX25GDTEFACILITIES:
1539         case SIOCX25SDTEFACILITIES:
1540         case SIOCX25GCALLUSERDATA:
1541         case SIOCX25SCALLUSERDATA:
1542         case SIOCX25GCAUSEDIAG:
1543         case SIOCX25SCUDMATCHLEN:
1544         case SIOCX25CALLACCPTAPPRV:
1545         case SIOCX25SENDCALLACCPT:
1546                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1547                 break;
1548         default:
1549                 rc = -ENOIOCTLCMD;
1550                 break;
1551         }
1552         return rc;
1553 }
1554 #endif
1555
1556 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1557         .family =       AF_X25,
1558         .owner =        THIS_MODULE,
1559         .release =      x25_release,
1560         .bind =         x25_bind,
1561         .connect =      x25_connect,
1562         .socketpair =   sock_no_socketpair,
1563         .accept =       x25_accept,
1564         .getname =      x25_getname,
1565         .poll =         datagram_poll,
1566         .ioctl =        x25_ioctl,
1567 #ifdef CONFIG_COMPAT
1568         .compat_ioctl = compat_x25_ioctl,
1569 #endif
1570         .listen =       x25_listen,
1571         .shutdown =     sock_no_shutdown,
1572         .setsockopt =   x25_setsockopt,
1573         .getsockopt =   x25_getsockopt,
1574         .sendmsg =      x25_sendmsg,
1575         .recvmsg =      x25_recvmsg,
1576         .mmap =         sock_no_mmap,
1577         .sendpage =     sock_no_sendpage,
1578 };
1579
1580 #include <linux/smp_lock.h>
1581 SOCKOPS_WRAP(x25_proto, AF_X25);
1582
1583 static struct packet_type x25_packet_type = {
1584         .type = __constant_htons(ETH_P_X25),
1585         .func = x25_lapb_receive_frame,
1586 };
1587
1588 static struct notifier_block x25_dev_notifier = {
1589         .notifier_call = x25_device_event,
1590 };
1591
1592 void x25_kill_by_neigh(struct x25_neigh *nb)
1593 {
1594         struct sock *s;
1595         struct hlist_node *node;
1596
1597         write_lock_bh(&x25_list_lock);
1598
1599         sk_for_each(s, node, &x25_list)
1600                 if (x25_sk(s)->neighbour == nb)
1601                         x25_disconnect(s, ENETUNREACH, 0, 0);
1602
1603         write_unlock_bh(&x25_list_lock);
1604 }
1605
1606 static int __init x25_init(void)
1607 {
1608         int rc = proto_register(&x25_proto, 0);
1609
1610         if (rc != 0)
1611                 goto out;
1612
1613         sock_register(&x25_family_ops);
1614
1615         dev_add_pack(&x25_packet_type);
1616
1617         register_netdevice_notifier(&x25_dev_notifier);
1618
1619         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1620
1621 #ifdef CONFIG_SYSCTL
1622         x25_register_sysctl();
1623 #endif
1624         x25_proc_init();
1625 out:
1626         return rc;
1627 }
1628 module_init(x25_init);
1629
1630 static void __exit x25_exit(void)
1631 {
1632         x25_proc_exit();
1633         x25_link_free();
1634         x25_route_free();
1635
1636 #ifdef CONFIG_SYSCTL
1637         x25_unregister_sysctl();
1638 #endif
1639
1640         unregister_netdevice_notifier(&x25_dev_notifier);
1641
1642         dev_remove_pack(&x25_packet_type);
1643
1644         sock_unregister(AF_X25);
1645         proto_unregister(&x25_proto);
1646 }
1647 module_exit(x25_exit);
1648
1649 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1650 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1651 MODULE_LICENSE("GPL");
1652 MODULE_ALIAS_NETPROTO(PF_X25);