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 void x25_init_timers(struct sock *sk);
 488
 489 static int x25_create(struct socket *sock, int protocol)
 490 {
 491         struct sock *sk;
 492         struct x25_sock *x25;
 493         int rc = -ESOCKTNOSUPPORT;
 494
 495         if (sock->type != SOCK_SEQPACKET || protocol)
 496                 goto out;
 497
 498         rc = -ENOMEM;
 499         if ((sk = x25_alloc_socket()) == NULL)
 500                 goto out;
 501
 502         x25 = x25_sk(sk);
 503
 504         sk->sk_socket = sock;
 505         sk->sk_type = sock->type;
 506         sk->sk_sleep = &sock->wait;
 507         sock->sk = sk;
 508
 509         x25_init_timers(sk);
 510
 511         sock->ops    = &x25_proto_ops;
 512         sk->sk_protocol = protocol;
 513         sk->sk_backlog_rcv = x25_backlog_rcv;
 514
 515         x25->t21   = sysctl_x25_call_request_timeout;
 516         x25->t22   = sysctl_x25_reset_request_timeout;
 517         x25->t23   = sysctl_x25_clear_request_timeout;
 518         x25->t2    = sysctl_x25_ack_holdback_timeout;
 519         x25->state = X25_STATE_0;
 520         x25->cudmatchlength = 0;
 521         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 522                                                         /* on call accept   */
 523
 524         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 525         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 526         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 527         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 528         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 529         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 530         x25->dte_facilities.calling_len = 0;
 531         x25->dte_facilities.called_len = 0;
 532         memset(x25->dte_facilities.called_ae, '\0',
 533                         sizeof(x25->dte_facilities.called_ae));
 534         memset(x25->dte_facilities.calling_ae, '\0',
 535                         sizeof(x25->dte_facilities.calling_ae));
 536
 537         rc = 0;
 538 out:
 539         return rc;
 540 }
 541
 542 static struct sock *x25_make_new(struct sock *osk)
 543 {
 544         struct sock *sk = NULL;
 545         struct x25_sock *x25, *ox25;
 546
 547         if (osk->sk_type != SOCK_SEQPACKET)
 548                 goto out;
 549
 550         if ((sk = x25_alloc_socket()) == NULL)
 551                 goto out;
 552
 553         x25 = x25_sk(sk);
 554
 555         sk->sk_type        = osk->sk_type;
 556         sk->sk_socket      = osk->sk_socket;
 557         sk->sk_priority    = osk->sk_priority;
 558         sk->sk_protocol    = osk->sk_protocol;
 559         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 560         sk->sk_sndbuf      = osk->sk_sndbuf;
 561         sk->sk_state       = TCP_ESTABLISHED;
 562         sk->sk_sleep       = osk->sk_sleep;
 563         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 564         sock_copy_flags(sk, osk);
 565
 566         ox25 = x25_sk(osk);
 567         x25->t21        = ox25->t21;
 568         x25->t22        = ox25->t22;
 569         x25->t23        = ox25->t23;
 570         x25->t2         = ox25->t2;
 571         x25->facilities = ox25->facilities;
 572         x25->qbitincl   = ox25->qbitincl;
 573         x25->dte_facilities = ox25->dte_facilities;
 574         x25->cudmatchlength = ox25->cudmatchlength;
 575         x25->accptapprv = ox25->accptapprv;
 576
 577         x25_init_timers(sk);
 578 out:
 579         return sk;
 580 }
 581
 582 static int x25_release(struct socket *sock)
 583 {
 584         struct sock *sk = sock->sk;
 585         struct x25_sock *x25;
 586
 587         if (!sk)
 588                 goto out;
 589
 590         x25 = x25_sk(sk);
 591
 592         switch (x25->state) {
 593
 594                 case X25_STATE_0:
 595                 case X25_STATE_2:
 596                         x25_disconnect(sk, 0, 0, 0);
 597                         x25_destroy_socket(sk);
 598                         goto out;
 599
 600                 case X25_STATE_1:
 601                 case X25_STATE_3:
 602                 case X25_STATE_4:
 603                         x25_clear_queues(sk);
 604                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 605                         x25_start_t23timer(sk);
 606                         x25->state = X25_STATE_2;
 607                         sk->sk_state    = TCP_CLOSE;
 608                         sk->sk_shutdown |= SEND_SHUTDOWN;
 609                         sk->sk_state_change(sk);
 610                         sock_set_flag(sk, SOCK_DEAD);
 611                         sock_set_flag(sk, SOCK_DESTROY);
 612                         break;
 613         }
 614
 615         sock->sk        = NULL;
 616         sk->sk_socket   = NULL; /* Not used, but we should do this */
 617 out:
 618         return 0;
 619 }
 620
 621 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 622 {
 623         struct sock *sk = sock->sk;
 624         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 625
 626         if (!sock_flag(sk, SOCK_ZAPPED) ||
 627             addr_len != sizeof(struct sockaddr_x25) ||
 628             addr->sx25_family != AF_X25)
 629                 return -EINVAL;
 630
 631         x25_sk(sk)->source_addr = addr->sx25_addr;
 632         x25_insert_socket(sk);
 633         sock_reset_flag(sk, SOCK_ZAPPED);
 634         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 635
 636         return 0;
 637 }
 638
 639 static int x25_wait_for_connection_establishment(struct sock *sk)
 640 {
 641         DECLARE_WAITQUEUE(wait, current);
 642         int rc;
 643
 644         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 645         for (;;) {
 646                 __set_current_state(TASK_INTERRUPTIBLE);
 647                 rc = -ERESTARTSYS;
 648                 if (signal_pending(current))
 649                         break;
 650                 rc = sock_error(sk);
 651                 if (rc) {
 652                         sk->sk_socket->state = SS_UNCONNECTED;
 653                         break;
 654                 }
 655                 rc = 0;
 656                 if (sk->sk_state != TCP_ESTABLISHED) {
 657                         release_sock(sk);
 658                         schedule();
 659                         lock_sock(sk);
 660                 } else
 661                         break;
 662         }
 663         __set_current_state(TASK_RUNNING);
 664         remove_wait_queue(sk->sk_sleep, &wait);
 665         return rc;
 666 }
 667
 668 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 669                        int addr_len, int flags)
 670 {
 671         struct sock *sk = sock->sk;
 672         struct x25_sock *x25 = x25_sk(sk);
 673         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 674         struct x25_route *rt;
 675         int rc = 0;
 676
 677         lock_sock(sk);
 678         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 679                 sock->state = SS_CONNECTED;
 680                 goto out; /* Connect completed during a ERESTARTSYS event */
 681         }
 682
 683         rc = -ECONNREFUSED;
 684         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 685                 sock->state = SS_UNCONNECTED;
 686                 goto out;
 687         }
 688
 689         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 690         if (sk->sk_state == TCP_ESTABLISHED)
 691                 goto out;
 692
 693         sk->sk_state   = TCP_CLOSE;
 694         sock->state = SS_UNCONNECTED;
 695
 696         rc = -EINVAL;
 697         if (addr_len != sizeof(struct sockaddr_x25) ||
 698             addr->sx25_family != AF_X25)
 699                 goto out;
 700
 701         rc = -ENETUNREACH;
 702         rt = x25_get_route(&addr->sx25_addr);
 703         if (!rt)
 704                 goto out;
 705
 706         x25->neighbour = x25_get_neigh(rt->dev);
 707         if (!x25->neighbour)
 708                 goto out_put_route;
 709
 710         x25_limit_facilities(&x25->facilities, x25->neighbour);
 711
 712         x25->lci = x25_new_lci(x25->neighbour);
 713         if (!x25->lci)
 714                 goto out_put_neigh;
 715
 716         rc = -EINVAL;
 717         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 718                 goto out_put_neigh;
 719
 720         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 721                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 722
 723         x25->dest_addr = addr->sx25_addr;
 724
 725         /* Move to connecting socket, start sending Connect Requests */
 726         sock->state   = SS_CONNECTING;
 727         sk->sk_state  = TCP_SYN_SENT;
 728
 729         x25->state = X25_STATE_1;
 730
 731         x25_write_internal(sk, X25_CALL_REQUEST);
 732
 733         x25_start_heartbeat(sk);
 734         x25_start_t21timer(sk);
 735
 736         /* Now the loop */
 737         rc = -EINPROGRESS;
 738         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 739                 goto out_put_neigh;
 740
 741         rc = x25_wait_for_connection_establishment(sk);
 742         if (rc)
 743                 goto out_put_neigh;
 744
 745         sock->state = SS_CONNECTED;
 746         rc = 0;
 747 out_put_neigh:
 748         if (rc)
 749                 x25_neigh_put(x25->neighbour);
 750 out_put_route:
 751         x25_route_put(rt);
 752 out:
 753         release_sock(sk);
 754         return rc;
 755 }
 756
 757 static int x25_wait_for_data(struct sock *sk, long timeout)
 758 {
 759         DECLARE_WAITQUEUE(wait, current);
 760         int rc = 0;
 761
 762         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 763         for (;;) {
 764                 __set_current_state(TASK_INTERRUPTIBLE);
 765                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 766                         break;
 767                 rc = -ERESTARTSYS;
 768                 if (signal_pending(current))
 769                         break;
 770                 rc = -EAGAIN;
 771                 if (!timeout)
 772                         break;
 773                 rc = 0;
 774                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 775                         release_sock(sk);
 776                         timeout = schedule_timeout(timeout);
 777                         lock_sock(sk);
 778                 } else
 779                         break;
 780         }
 781         __set_current_state(TASK_RUNNING);
 782         remove_wait_queue(sk->sk_sleep, &wait);
 783         return rc;
 784 }
 785
 786 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 787 {
 788         struct sock *sk = sock->sk;
 789         struct sock *newsk;
 790         struct sk_buff *skb;
 791         int rc = -EINVAL;
 792
 793         if (!sk || sk->sk_state != TCP_LISTEN)
 794                 goto out;
 795
 796         rc = -EOPNOTSUPP;
 797         if (sk->sk_type != SOCK_SEQPACKET)
 798                 goto out;
 799
 800         lock_sock(sk);
 801         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 802         if (rc)
 803                 goto out2;
 804         skb = skb_dequeue(&sk->sk_receive_queue);
 805         rc = -EINVAL;
 806         if (!skb->sk)
 807                 goto out2;
 808         newsk            = skb->sk;
 809         newsk->sk_socket = newsock;
 810         newsk->sk_sleep  = &newsock->wait;
 811
 812         /* Now attach up the new socket */
 813         skb->sk = NULL;
 814         kfree_skb(skb);
 815         sk->sk_ack_backlog--;
 816         newsock->sk    = newsk;
 817         newsock->state = SS_CONNECTED;
 818         rc = 0;
 819 out2:
 820         release_sock(sk);
 821 out:
 822         return rc;
 823 }
 824
 825 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 826                        int *uaddr_len, int peer)
 827 {
 828         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 829         struct sock *sk = sock->sk;
 830         struct x25_sock *x25 = x25_sk(sk);
 831
 832         if (peer) {
 833                 if (sk->sk_state != TCP_ESTABLISHED)
 834                         return -ENOTCONN;
 835                 sx25->sx25_addr = x25->dest_addr;
 836         } else
 837                 sx25->sx25_addr = x25->source_addr;
 838
 839         sx25->sx25_family = AF_X25;
 840         *uaddr_len = sizeof(*sx25);
 841
 842         return 0;
 843 }
 844
 845 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 846                         unsigned int lci)
 847 {
 848         struct sock *sk;
 849         struct sock *make;
 850         struct x25_sock *makex25;
 851         struct x25_address source_addr, dest_addr;
 852         struct x25_facilities facilities;
 853         struct x25_dte_facilities dte_facilities;
 854         int len, rc;
 855
 856         /*
 857          *      Remove the LCI and frame type.
 858          */
 859         skb_pull(skb, X25_STD_MIN_LEN);
 860
 861         /*
 862          *      Extract the X.25 addresses and convert them to ASCII strings,
 863          *      and remove them.
 864          */
 865         skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
 866
 867         /*
 868          *      Get the length of the facilities, skip past them for the moment
 869          *      get the call user data because this is needed to determine
 870          *      the correct listener
 871          */
 872         len = skb->data[0] + 1;
 873         skb_pull(skb,len);
 874
 875         /*
 876          *      Find a listener for the particular address/cud pair.
 877          */
 878         sk = x25_find_listener(&source_addr,skb);
 879         skb_push(skb,len);
 880
 881         /*
 882          *      We can't accept the Call Request.
 883          */
 884         if (sk == NULL || sk_acceptq_is_full(sk))
 885                 goto out_clear_request;
 886
 887         /*
 888          *      Try to reach a compromise on the requested facilities.
 889          */
 890         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 891         if (len == -1)
 892                 goto out_sock_put;
 893
 894         /*
 895          * current neighbour/link might impose additional limits
 896          * on certain facilties
 897          */
 898
 899         x25_limit_facilities(&facilities, nb);
 900
 901         /*
 902          *      Try to create a new socket.
 903          */
 904         make = x25_make_new(sk);
 905         if (!make)
 906                 goto out_sock_put;
 907
 908         /*
 909          *      Remove the facilities
 910          */
 911         skb_pull(skb, len);
 912
 913         skb->sk     = make;
 914         make->sk_state = TCP_ESTABLISHED;
 915
 916         makex25 = x25_sk(make);
 917         makex25->lci           = lci;
 918         makex25->dest_addr     = dest_addr;
 919         makex25->source_addr   = source_addr;
 920         makex25->neighbour     = nb;
 921         makex25->facilities    = facilities;
 922         makex25->dte_facilities= dte_facilities;
 923         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 924         /* ensure no reverse facil on accept */
 925         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 926         /* ensure no calling address extension on accept */
 927         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 928         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 929
 930         /* Normally all calls are accepted immediatly */
 931         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 932                 x25_write_internal(make, X25_CALL_ACCEPTED);
 933                 makex25->state = X25_STATE_3;
 934         }
 935
 936         /*
 937          *      Incoming Call User Data.
 938          */
 939         if (skb->len >= 0) {
 940                 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
 941                 makex25->calluserdata.cudlength = skb->len;
 942         }
 943
 944         sk->sk_ack_backlog++;
 945
 946         x25_insert_socket(make);
 947
 948         skb_queue_head(&sk->sk_receive_queue, skb);
 949
 950         x25_start_heartbeat(make);
 951
 952         if (!sock_flag(sk, SOCK_DEAD))
 953                 sk->sk_data_ready(sk, skb->len);
 954         rc = 1;
 955         sock_put(sk);
 956 out:
 957         return rc;
 958 out_sock_put:
 959         sock_put(sk);
 960 out_clear_request:
 961         rc = 0;
 962         x25_transmit_clear_request(nb, lci, 0x01);
 963         goto out;
 964 }
 965
 966 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 967                        struct msghdr *msg, size_t len)
 968 {
 969         struct sock *sk = sock->sk;
 970         struct x25_sock *x25 = x25_sk(sk);
 971         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 972         struct sockaddr_x25 sx25;
 973         struct sk_buff *skb;
 974         unsigned char *asmptr;
 975         int noblock = msg->msg_flags & MSG_DONTWAIT;
 976         size_t size;
 977         int qbit = 0, rc = -EINVAL;
 978
 979         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 980                 goto out;
 981
 982         /* we currently don't support segmented records at the user interface */
 983         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 984                 goto out;
 985
 986         rc = -EADDRNOTAVAIL;
 987         if (sock_flag(sk, SOCK_ZAPPED))
 988                 goto out;
 989
 990         rc = -EPIPE;
 991         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 992                 send_sig(SIGPIPE, current, 0);
 993                 goto out;
 994         }
 995
 996         rc = -ENETUNREACH;
 997         if (!x25->neighbour)
 998                 goto out;
 999
1000         if (usx25) {
1001                 rc = -EINVAL;
1002                 if (msg->msg_namelen < sizeof(sx25))
1003                         goto out;
1004                 memcpy(&sx25, usx25, sizeof(sx25));
1005                 rc = -EISCONN;
1006                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1007                         goto out;
1008                 rc = -EINVAL;
1009                 if (sx25.sx25_family != AF_X25)
1010                         goto out;
1011         } else {
1012                 /*
1013                  *      FIXME 1003.1g - if the socket is like this because
1014                  *      it has become closed (not started closed) we ought
1015                  *      to SIGPIPE, EPIPE;
1016                  */
1017                 rc = -ENOTCONN;
1018                 if (sk->sk_state != TCP_ESTABLISHED)
1019                         goto out;
1020
1021                 sx25.sx25_family = AF_X25;
1022                 sx25.sx25_addr   = x25->dest_addr;
1023         }
1024
1025         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1026
1027         /* Build a packet */
1028         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1029
1030         if ((msg->msg_flags & MSG_OOB) && len > 32)
1031                 len = 32;
1032
1033         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1034
1035         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1036         if (!skb)
1037                 goto out;
1038         X25_SKB_CB(skb)->flags = msg->msg_flags;
1039
1040         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1041
1042         /*
1043          *      Put the data on the end
1044          */
1045         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1046
1047         asmptr = skb->h.raw = skb_put(skb, len);
1048
1049         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1050         if (rc)
1051                 goto out_kfree_skb;
1052
1053         /*
1054          *      If the Q BIT Include socket option is in force, the first
1055          *      byte of the user data is the logical value of the Q Bit.
1056          */
1057         if (x25->qbitincl) {
1058                 qbit = skb->data[0];
1059                 skb_pull(skb, 1);
1060         }
1061
1062         /*
1063          *      Push down the X.25 header
1064          */
1065         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1066
1067         if (msg->msg_flags & MSG_OOB) {
1068                 if (x25->neighbour->extended) {
1069                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1070                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1071                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1072                         *asmptr++ = X25_INTERRUPT;
1073                 } else {
1074                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1075                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1076                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1077                         *asmptr++ = X25_INTERRUPT;
1078                 }
1079         } else {
1080                 if (x25->neighbour->extended) {
1081                         /* Build an Extended X.25 header */
1082                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1083                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1084                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1085                         *asmptr++ = X25_DATA;
1086                         *asmptr++ = X25_DATA;
1087                 } else {
1088                         /* Build an Standard X.25 header */
1089                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1090                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1091                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1092                         *asmptr++ = X25_DATA;
1093                 }
1094
1095                 if (qbit)
1096                         skb->data[0] |= X25_Q_BIT;
1097         }
1098
1099         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1100         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1101
1102         rc = -ENOTCONN;
1103         if (sk->sk_state != TCP_ESTABLISHED)
1104                 goto out_kfree_skb;
1105
1106         if (msg->msg_flags & MSG_OOB)
1107                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1108         else {
1109                 len = x25_output(sk, skb);
1110                 if (len < 0)
1111                         kfree_skb(skb);
1112                 else if (x25->qbitincl)
1113                         len++;
1114         }
1115
1116         /*
1117          * lock_sock() is currently only used to serialize this x25_kick()
1118          * against input-driven x25_kick() calls. It currently only blocks
1119          * incoming packets for this socket and does not protect against
1120          * any other socket state changes and is not called from anywhere
1121          * else. As x25_kick() cannot block and as long as all socket
1122          * operations are BKL-wrapped, we don't need take to care about
1123          * purging the backlog queue in x25_release().
1124          *
1125          * Using lock_sock() to protect all socket operations entirely
1126          * (and making the whole x25 stack SMP aware) unfortunately would
1127          * require major changes to {send,recv}msg and skb allocation methods.
1128          * -> 2.5 ;)
1129          */
1130         lock_sock(sk);
1131         x25_kick(sk);
1132         release_sock(sk);
1133         rc = len;
1134 out:
1135         return rc;
1136 out_kfree_skb:
1137         kfree_skb(skb);
1138         goto out;
1139 }
1140
1141
1142 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1143                        struct msghdr *msg, size_t size,
1144                        int flags)
1145 {
1146         struct sock *sk = sock->sk;
1147         struct x25_sock *x25 = x25_sk(sk);
1148         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1149         size_t copied;
1150         int qbit;
1151         struct sk_buff *skb;
1152         unsigned char *asmptr;
1153         int rc = -ENOTCONN;
1154
1155         /*
1156          * This works for seqpacket too. The receiver has ordered the queue for
1157          * us! We do one quick check first though
1158          */
1159         if (sk->sk_state != TCP_ESTABLISHED)
1160                 goto out;
1161
1162         if (flags & MSG_OOB) {
1163                 rc = -EINVAL;
1164                 if (sock_flag(sk, SOCK_URGINLINE) ||
1165                     !skb_peek(&x25->interrupt_in_queue))
1166                         goto out;
1167
1168                 skb = skb_dequeue(&x25->interrupt_in_queue);
1169
1170                 skb_pull(skb, X25_STD_MIN_LEN);
1171
1172                 /*
1173                  *      No Q bit information on Interrupt data.
1174                  */
1175                 if (x25->qbitincl) {
1176                         asmptr  = skb_push(skb, 1);
1177                         *asmptr = 0x00;
1178                 }
1179
1180                 msg->msg_flags |= MSG_OOB;
1181         } else {
1182                 /* Now we can treat all alike */
1183                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1184                                         flags & MSG_DONTWAIT, &rc);
1185                 if (!skb)
1186                         goto out;
1187
1188                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1189
1190                 skb_pull(skb, x25->neighbour->extended ?
1191                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1192
1193                 if (x25->qbitincl) {
1194                         asmptr  = skb_push(skb, 1);
1195                         *asmptr = qbit;
1196                 }
1197         }
1198
1199         skb->h.raw = skb->data;
1200
1201         copied = skb->len;
1202
1203         if (copied > size) {
1204                 copied = size;
1205                 msg->msg_flags |= MSG_TRUNC;
1206         }
1207
1208         /* Currently, each datagram always contains a complete record */
1209         msg->msg_flags |= MSG_EOR;
1210
1211         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1212         if (rc)
1213                 goto out_free_dgram;
1214
1215         if (sx25) {
1216                 sx25->sx25_family = AF_X25;
1217                 sx25->sx25_addr   = x25->dest_addr;
1218         }
1219
1220         msg->msg_namelen = sizeof(struct sockaddr_x25);
1221
1222         lock_sock(sk);
1223         x25_check_rbuf(sk);
1224         release_sock(sk);
1225         rc = copied;
1226 out_free_dgram:
1227         skb_free_datagram(sk, skb);
1228 out:
1229         return rc;
1230 }
1231
1232
1233 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1234 {
1235         struct sock *sk = sock->sk;
1236         struct x25_sock *x25 = x25_sk(sk);
1237         void __user *argp = (void __user *)arg;
1238         int rc;
1239
1240         switch (cmd) {
1241                 case TIOCOUTQ: {
1242                         int amount = sk->sk_sndbuf -
1243                                      atomic_read(&sk->sk_wmem_alloc);
1244                         if (amount < 0)
1245                                 amount = 0;
1246                         rc = put_user(amount, (unsigned int __user *)argp);
1247                         break;
1248                 }
1249
1250                 case TIOCINQ: {
1251                         struct sk_buff *skb;
1252                         int amount = 0;
1253                         /*
1254                          * These two are safe on a single CPU system as
1255                          * only user tasks fiddle here
1256                          */
1257                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1258                                 amount = skb->len;
1259                         rc = put_user(amount, (unsigned int __user *)argp);
1260                         break;
1261                 }
1262
1263                 case SIOCGSTAMP:
1264                         rc = -EINVAL;
1265                         if (sk)
1266                                 rc = sock_get_timestamp(sk,
1267                                                 (struct timeval __user *)argp);
1268                         break;
1269                 case SIOCGIFADDR:
1270                 case SIOCSIFADDR:
1271                 case SIOCGIFDSTADDR:
1272                 case SIOCSIFDSTADDR:
1273                 case SIOCGIFBRDADDR:
1274                 case SIOCSIFBRDADDR:
1275                 case SIOCGIFNETMASK:
1276                 case SIOCSIFNETMASK:
1277                 case SIOCGIFMETRIC:
1278                 case SIOCSIFMETRIC:
1279                         rc = -EINVAL;
1280                         break;
1281                 case SIOCADDRT:
1282                 case SIOCDELRT:
1283                         rc = -EPERM;
1284                         if (!capable(CAP_NET_ADMIN))
1285                                 break;
1286                         rc = x25_route_ioctl(cmd, argp);
1287                         break;
1288                 case SIOCX25GSUBSCRIP:
1289                         rc = x25_subscr_ioctl(cmd, argp);
1290                         break;
1291                 case SIOCX25SSUBSCRIP:
1292                         rc = -EPERM;
1293                         if (!capable(CAP_NET_ADMIN))
1294                                 break;
1295                         rc = x25_subscr_ioctl(cmd, argp);
1296                         break;
1297                 case SIOCX25GFACILITIES: {
1298                         struct x25_facilities fac = x25->facilities;
1299                         rc = copy_to_user(argp, &fac,
1300                                           sizeof(fac)) ? -EFAULT : 0;
1301                         break;
1302                 }
1303
1304                 case SIOCX25SFACILITIES: {
1305                         struct x25_facilities facilities;
1306                         rc = -EFAULT;
1307                         if (copy_from_user(&facilities, argp,
1308                                            sizeof(facilities)))
1309                                 break;
1310                         rc = -EINVAL;
1311                         if (sk->sk_state != TCP_LISTEN &&
1312                             sk->sk_state != TCP_CLOSE)
1313                                 break;
1314                         if (facilities.pacsize_in < X25_PS16 ||
1315                             facilities.pacsize_in > X25_PS4096)
1316                                 break;
1317                         if (facilities.pacsize_out < X25_PS16 ||
1318                             facilities.pacsize_out > X25_PS4096)
1319                                 break;
1320                         if (facilities.winsize_in < 1 ||
1321                             facilities.winsize_in > 127)
1322                                 break;
1323                         if (facilities.throughput < 0x03 ||
1324                             facilities.throughput > 0xDD)
1325                                 break;
1326                         if (facilities.reverse &&
1327                                 (facilities.reverse | 0x81)!= 0x81)
1328                                 break;
1329                         x25->facilities = facilities;
1330                         rc = 0;
1331                         break;
1332                 }
1333
1334                 case SIOCX25GDTEFACILITIES: {
1335                         rc = copy_to_user(argp, &x25->dte_facilities,
1336                                                 sizeof(x25->dte_facilities));
1337                         if (rc)
1338                                 rc = -EFAULT;
1339                         break;
1340                 }
1341
1342                 case SIOCX25SDTEFACILITIES: {
1343                         struct x25_dte_facilities dtefacs;
1344                         rc = -EFAULT;
1345                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1346                                 break;
1347                         rc = -EINVAL;
1348                         if (sk->sk_state != TCP_LISTEN &&
1349                                         sk->sk_state != TCP_CLOSE)
1350                                 break;
1351                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1352                                 break;
1353                         if (dtefacs.calling_ae == NULL)
1354                                 break;
1355                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1356                                 break;
1357                         if (dtefacs.called_ae == NULL)
1358                                 break;
1359                         x25->dte_facilities = dtefacs;
1360                         rc = 0;
1361                         break;
1362                 }
1363
1364                 case SIOCX25GCALLUSERDATA: {
1365                         struct x25_calluserdata cud = x25->calluserdata;
1366                         rc = copy_to_user(argp, &cud,
1367                                           sizeof(cud)) ? -EFAULT : 0;
1368                         break;
1369                 }
1370
1371                 case SIOCX25SCALLUSERDATA: {
1372                         struct x25_calluserdata calluserdata;
1373
1374                         rc = -EFAULT;
1375                         if (copy_from_user(&calluserdata, argp,
1376                                            sizeof(calluserdata)))
1377                                 break;
1378                         rc = -EINVAL;
1379                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1380                                 break;
1381                         x25->calluserdata = calluserdata;
1382                         rc = 0;
1383                         break;
1384                 }
1385
1386                 case SIOCX25GCAUSEDIAG: {
1387                         struct x25_causediag causediag;
1388                         causediag = x25->causediag;
1389                         rc = copy_to_user(argp, &causediag,
1390                                           sizeof(causediag)) ? -EFAULT : 0;
1391                         break;
1392                 }
1393
1394                 case SIOCX25SCUDMATCHLEN: {
1395                         struct x25_subaddr sub_addr;
1396                         rc = -EINVAL;
1397                         if(sk->sk_state != TCP_CLOSE)
1398                                 break;
1399                         rc = -EFAULT;
1400                         if (copy_from_user(&sub_addr, argp,
1401                                         sizeof(sub_addr)))
1402                                 break;
1403                         rc = -EINVAL;
1404                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1405                                 break;
1406                         x25->cudmatchlength = sub_addr.cudmatchlength;
1407                         rc = 0;
1408                         break;
1409                 }
1410
1411                 case SIOCX25CALLACCPTAPPRV: {
1412                         rc = -EINVAL;
1413                         if (sk->sk_state != TCP_CLOSE)
1414                                 break;
1415                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1416                         rc = 0;
1417                         break;
1418                 }
1419
1420                 case SIOCX25SENDCALLACCPT:  {
1421                         rc = -EINVAL;
1422                         if (sk->sk_state != TCP_ESTABLISHED)
1423                                 break;
1424                         if (x25->accptapprv)    /* must call accptapprv above */
1425                                 break;
1426                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1427                         x25->state = X25_STATE_3;
1428                         rc = 0;
1429                         break;
1430                 }
1431
1432                 default:
1433                         rc = -ENOIOCTLCMD;
1434                         break;
1435         }
1436
1437         return rc;
1438 }
1439
1440 static struct net_proto_family x25_family_ops = {
1441         .family =       AF_X25,
1442         .create =       x25_create,
1443         .owner  =       THIS_MODULE,
1444 };
1445
1446 #ifdef CONFIG_COMPAT
1447 static int compat_x25_subscr_ioctl(unsigned int cmd,
1448                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1449 {
1450         struct compat_x25_subscrip_struct x25_subscr;
1451         struct x25_neigh *nb;
1452         struct net_device *dev;
1453         int rc = -EINVAL;
1454
1455         rc = -EFAULT;
1456         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1457                 goto out;
1458
1459         rc = -EINVAL;
1460         dev = x25_dev_get(x25_subscr.device);
1461         if (dev == NULL)
1462                 goto out;
1463
1464         nb = x25_get_neigh(dev);
1465         if (nb == NULL)
1466                 goto out_dev_put;
1467
1468         dev_put(dev);
1469
1470         if (cmd == SIOCX25GSUBSCRIP) {
1471                 x25_subscr.extended = nb->extended;
1472                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1473                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1474                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1475         } else {
1476                 rc = -EINVAL;
1477                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1478                         rc = 0;
1479                         nb->extended = x25_subscr.extended;
1480                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1481                 }
1482         }
1483         x25_neigh_put(nb);
1484 out:
1485         return rc;
1486 out_dev_put:
1487         dev_put(dev);
1488         goto out;
1489 }
1490
1491 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1492                                 unsigned long arg)
1493 {
1494         void __user *argp = compat_ptr(arg);
1495         struct sock *sk = sock->sk;
1496
1497         int rc = -ENOIOCTLCMD;
1498
1499         switch(cmd) {
1500         case TIOCOUTQ:
1501         case TIOCINQ:
1502                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1503                 break;
1504         case SIOCGSTAMP:
1505                 rc = -EINVAL;
1506                 if (sk)
1507                         rc = compat_sock_get_timestamp(sk,
1508                                         (struct timeval __user*)argp);
1509                 break;
1510         case SIOCGIFADDR:
1511         case SIOCSIFADDR:
1512         case SIOCGIFDSTADDR:
1513         case SIOCSIFDSTADDR:
1514         case SIOCGIFBRDADDR:
1515         case SIOCSIFBRDADDR:
1516         case SIOCGIFNETMASK:
1517         case SIOCSIFNETMASK:
1518         case SIOCGIFMETRIC:
1519         case SIOCSIFMETRIC:
1520                 rc = -EINVAL;
1521                 break;
1522         case SIOCADDRT:
1523         case SIOCDELRT:
1524                 rc = -EPERM;
1525                 if (!capable(CAP_NET_ADMIN))
1526                         break;
1527                 rc = x25_route_ioctl(cmd, argp);
1528                 break;
1529         case SIOCX25GSUBSCRIP:
1530                 rc = compat_x25_subscr_ioctl(cmd, argp);
1531                 break;
1532         case SIOCX25SSUBSCRIP:
1533                 rc = -EPERM;
1534                 if (!capable(CAP_NET_ADMIN))
1535                         break;
1536                 rc = compat_x25_subscr_ioctl(cmd, argp);
1537                 break;
1538         case SIOCX25GFACILITIES:
1539         case SIOCX25SFACILITIES:
1540         case SIOCX25GDTEFACILITIES:
1541         case SIOCX25SDTEFACILITIES:
1542         case SIOCX25GCALLUSERDATA:
1543         case SIOCX25SCALLUSERDATA:
1544         case SIOCX25GCAUSEDIAG:
1545         case SIOCX25SCUDMATCHLEN:
1546         case SIOCX25CALLACCPTAPPRV:
1547         case SIOCX25SENDCALLACCPT:
1548                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1549                 break;
1550         default:
1551                 rc = -ENOIOCTLCMD;
1552                 break;
1553         }
1554         return rc;
1555 }
1556 #endif
1557
1558 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1559         .family =       AF_X25,
1560         .owner =        THIS_MODULE,
1561         .release =      x25_release,
1562         .bind =         x25_bind,
1563         .connect =      x25_connect,
1564         .socketpair =   sock_no_socketpair,
1565         .accept =       x25_accept,
1566         .getname =      x25_getname,
1567         .poll =         datagram_poll,
1568         .ioctl =        x25_ioctl,
1569 #ifdef CONFIG_COMPAT
1570         .compat_ioctl = compat_x25_ioctl,
1571 #endif
1572         .listen =       x25_listen,
1573         .shutdown =     sock_no_shutdown,
1574         .setsockopt =   x25_setsockopt,
1575         .getsockopt =   x25_getsockopt,
1576         .sendmsg =      x25_sendmsg,
1577         .recvmsg =      x25_recvmsg,
1578         .mmap =         sock_no_mmap,
1579         .sendpage =     sock_no_sendpage,
1580 };
1581
1582 #include <linux/smp_lock.h>
1583 SOCKOPS_WRAP(x25_proto, AF_X25);
1584
1585 static struct packet_type x25_packet_type = {
1586         .type = __constant_htons(ETH_P_X25),
1587         .func = x25_lapb_receive_frame,
1588 };
1589
1590 static struct notifier_block x25_dev_notifier = {
1591         .notifier_call = x25_device_event,
1592 };
1593
1594 void x25_kill_by_neigh(struct x25_neigh *nb)
1595 {
1596         struct sock *s;
1597         struct hlist_node *node;
1598
1599         write_lock_bh(&x25_list_lock);
1600
1601         sk_for_each(s, node, &x25_list)
1602                 if (x25_sk(s)->neighbour == nb)
1603                         x25_disconnect(s, ENETUNREACH, 0, 0);
1604
1605         write_unlock_bh(&x25_list_lock);
1606 }
1607
1608 static int __init x25_init(void)
1609 {
1610         int rc = proto_register(&x25_proto, 0);
1611
1612         if (rc != 0)
1613                 goto out;
1614
1615         sock_register(&x25_family_ops);
1616
1617         dev_add_pack(&x25_packet_type);
1618
1619         register_netdevice_notifier(&x25_dev_notifier);
1620
1621         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1622
1623 #ifdef CONFIG_SYSCTL
1624         x25_register_sysctl();
1625 #endif
1626         x25_proc_init();
1627 out:
1628         return rc;
1629 }
1630 module_init(x25_init);
1631
1632 static void __exit x25_exit(void)
1633 {
1634         x25_proc_exit();
1635         x25_link_free();
1636         x25_route_free();
1637
1638 #ifdef CONFIG_SYSCTL
1639         x25_unregister_sysctl();
1640 #endif
1641
1642         unregister_netdevice_notifier(&x25_dev_notifier);
1643
1644         dev_remove_pack(&x25_packet_type);
1645
1646         sock_unregister(AF_X25);
1647         proto_unregister(&x25_proto);
1648 }
1649 module_exit(x25_exit);
1650
1651 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1652 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1653 MODULE_LICENSE("GPL");
1654 MODULE_ALIAS_NETPROTO(PF_X25);