git.oblomov.eu Git - linux-2.6/blob - net/x25/af_x25.c

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      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         sock_init_data(sock, sk);
 505
 506         x25_init_timers(sk);
 507
 508         sock->ops    = &x25_proto_ops;
 509         sk->sk_protocol = protocol;
 510         sk->sk_backlog_rcv = x25_backlog_rcv;
 511
 512         x25->t21   = sysctl_x25_call_request_timeout;
 513         x25->t22   = sysctl_x25_reset_request_timeout;
 514         x25->t23   = sysctl_x25_clear_request_timeout;
 515         x25->t2    = sysctl_x25_ack_holdback_timeout;
 516         x25->state = X25_STATE_0;
 517         x25->cudmatchlength = 0;
 518         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 519                                                         /* on call accept   */
 520
 521         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 522         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 523         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 524         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 525         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 526         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 527         x25->dte_facilities.calling_len = 0;
 528         x25->dte_facilities.called_len = 0;
 529         memset(x25->dte_facilities.called_ae, '\0',
 530                         sizeof(x25->dte_facilities.called_ae));
 531         memset(x25->dte_facilities.calling_ae, '\0',
 532                         sizeof(x25->dte_facilities.calling_ae));
 533
 534         rc = 0;
 535 out:
 536         return rc;
 537 }
 538
 539 static struct sock *x25_make_new(struct sock *osk)
 540 {
 541         struct sock *sk = NULL;
 542         struct x25_sock *x25, *ox25;
 543
 544         if (osk->sk_type != SOCK_SEQPACKET)
 545                 goto out;
 546
 547         if ((sk = x25_alloc_socket()) == NULL)
 548                 goto out;
 549
 550         x25 = x25_sk(sk);
 551
 552         sk->sk_type        = osk->sk_type;
 553         sk->sk_socket      = osk->sk_socket;
 554         sk->sk_priority    = osk->sk_priority;
 555         sk->sk_protocol    = osk->sk_protocol;
 556         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 557         sk->sk_sndbuf      = osk->sk_sndbuf;
 558         sk->sk_state       = TCP_ESTABLISHED;
 559         sk->sk_sleep       = osk->sk_sleep;
 560         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 561         sock_copy_flags(sk, osk);
 562
 563         ox25 = x25_sk(osk);
 564         x25->t21        = ox25->t21;
 565         x25->t22        = ox25->t22;
 566         x25->t23        = ox25->t23;
 567         x25->t2         = ox25->t2;
 568         x25->facilities = ox25->facilities;
 569         x25->qbitincl   = ox25->qbitincl;
 570         x25->dte_facilities = ox25->dte_facilities;
 571         x25->cudmatchlength = ox25->cudmatchlength;
 572         x25->accptapprv = ox25->accptapprv;
 573
 574         x25_init_timers(sk);
 575 out:
 576         return sk;
 577 }
 578
 579 static int x25_release(struct socket *sock)
 580 {
 581         struct sock *sk = sock->sk;
 582         struct x25_sock *x25;
 583
 584         if (!sk)
 585                 goto out;
 586
 587         x25 = x25_sk(sk);
 588
 589         switch (x25->state) {
 590
 591                 case X25_STATE_0:
 592                 case X25_STATE_2:
 593                         x25_disconnect(sk, 0, 0, 0);
 594                         x25_destroy_socket(sk);
 595                         goto out;
 596
 597                 case X25_STATE_1:
 598                 case X25_STATE_3:
 599                 case X25_STATE_4:
 600                         x25_clear_queues(sk);
 601                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 602                         x25_start_t23timer(sk);
 603                         x25->state = X25_STATE_2;
 604                         sk->sk_state    = TCP_CLOSE;
 605                         sk->sk_shutdown |= SEND_SHUTDOWN;
 606                         sk->sk_state_change(sk);
 607                         sock_set_flag(sk, SOCK_DEAD);
 608                         sock_set_flag(sk, SOCK_DESTROY);
 609                         break;
 610         }
 611
 612         sock->sk        = NULL;
 613         sk->sk_socket   = NULL; /* Not used, but we should do this */
 614 out:
 615         return 0;
 616 }
 617
 618 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 619 {
 620         struct sock *sk = sock->sk;
 621         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 622
 623         if (!sock_flag(sk, SOCK_ZAPPED) ||
 624             addr_len != sizeof(struct sockaddr_x25) ||
 625             addr->sx25_family != AF_X25)
 626                 return -EINVAL;
 627
 628         x25_sk(sk)->source_addr = addr->sx25_addr;
 629         x25_insert_socket(sk);
 630         sock_reset_flag(sk, SOCK_ZAPPED);
 631         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 632
 633         return 0;
 634 }
 635
 636 static int x25_wait_for_connection_establishment(struct sock *sk)
 637 {
 638         DECLARE_WAITQUEUE(wait, current);
 639         int rc;
 640
 641         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 642         for (;;) {
 643                 __set_current_state(TASK_INTERRUPTIBLE);
 644                 rc = -ERESTARTSYS;
 645                 if (signal_pending(current))
 646                         break;
 647                 rc = sock_error(sk);
 648                 if (rc) {
 649                         sk->sk_socket->state = SS_UNCONNECTED;
 650                         break;
 651                 }
 652                 rc = 0;
 653                 if (sk->sk_state != TCP_ESTABLISHED) {
 654                         release_sock(sk);
 655                         schedule();
 656                         lock_sock(sk);
 657                 } else
 658                         break;
 659         }
 660         __set_current_state(TASK_RUNNING);
 661         remove_wait_queue(sk->sk_sleep, &wait);
 662         return rc;
 663 }
 664
 665 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 666                        int addr_len, int flags)
 667 {
 668         struct sock *sk = sock->sk;
 669         struct x25_sock *x25 = x25_sk(sk);
 670         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 671         struct x25_route *rt;
 672         int rc = 0;
 673
 674         lock_sock(sk);
 675         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 676                 sock->state = SS_CONNECTED;
 677                 goto out; /* Connect completed during a ERESTARTSYS event */
 678         }
 679
 680         rc = -ECONNREFUSED;
 681         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 682                 sock->state = SS_UNCONNECTED;
 683                 goto out;
 684         }
 685
 686         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 687         if (sk->sk_state == TCP_ESTABLISHED)
 688                 goto out;
 689
 690         sk->sk_state   = TCP_CLOSE;
 691         sock->state = SS_UNCONNECTED;
 692
 693         rc = -EINVAL;
 694         if (addr_len != sizeof(struct sockaddr_x25) ||
 695             addr->sx25_family != AF_X25)
 696                 goto out;
 697
 698         rc = -ENETUNREACH;
 699         rt = x25_get_route(&addr->sx25_addr);
 700         if (!rt)
 701                 goto out;
 702
 703         x25->neighbour = x25_get_neigh(rt->dev);
 704         if (!x25->neighbour)
 705                 goto out_put_route;
 706
 707         x25_limit_facilities(&x25->facilities, x25->neighbour);
 708
 709         x25->lci = x25_new_lci(x25->neighbour);
 710         if (!x25->lci)
 711                 goto out_put_neigh;
 712
 713         rc = -EINVAL;
 714         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 715                 goto out_put_neigh;
 716
 717         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 718                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 719
 720         x25->dest_addr = addr->sx25_addr;
 721
 722         /* Move to connecting socket, start sending Connect Requests */
 723         sock->state   = SS_CONNECTING;
 724         sk->sk_state  = TCP_SYN_SENT;
 725
 726         x25->state = X25_STATE_1;
 727
 728         x25_write_internal(sk, X25_CALL_REQUEST);
 729
 730         x25_start_heartbeat(sk);
 731         x25_start_t21timer(sk);
 732
 733         /* Now the loop */
 734         rc = -EINPROGRESS;
 735         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 736                 goto out_put_neigh;
 737
 738         rc = x25_wait_for_connection_establishment(sk);
 739         if (rc)
 740                 goto out_put_neigh;
 741
 742         sock->state = SS_CONNECTED;
 743         rc = 0;
 744 out_put_neigh:
 745         if (rc)
 746                 x25_neigh_put(x25->neighbour);
 747 out_put_route:
 748         x25_route_put(rt);
 749 out:
 750         release_sock(sk);
 751         return rc;
 752 }
 753
 754 static int x25_wait_for_data(struct sock *sk, long timeout)
 755 {
 756         DECLARE_WAITQUEUE(wait, current);
 757         int rc = 0;
 758
 759         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 760         for (;;) {
 761                 __set_current_state(TASK_INTERRUPTIBLE);
 762                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 763                         break;
 764                 rc = -ERESTARTSYS;
 765                 if (signal_pending(current))
 766                         break;
 767                 rc = -EAGAIN;
 768                 if (!timeout)
 769                         break;
 770                 rc = 0;
 771                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 772                         release_sock(sk);
 773                         timeout = schedule_timeout(timeout);
 774                         lock_sock(sk);
 775                 } else
 776                         break;
 777         }
 778         __set_current_state(TASK_RUNNING);
 779         remove_wait_queue(sk->sk_sleep, &wait);
 780         return rc;
 781 }
 782
 783 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 784 {
 785         struct sock *sk = sock->sk;
 786         struct sock *newsk;
 787         struct sk_buff *skb;
 788         int rc = -EINVAL;
 789
 790         if (!sk || sk->sk_state != TCP_LISTEN)
 791                 goto out;
 792
 793         rc = -EOPNOTSUPP;
 794         if (sk->sk_type != SOCK_SEQPACKET)
 795                 goto out;
 796
 797         lock_sock(sk);
 798         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 799         if (rc)
 800                 goto out2;
 801         skb = skb_dequeue(&sk->sk_receive_queue);
 802         rc = -EINVAL;
 803         if (!skb->sk)
 804                 goto out2;
 805         newsk            = skb->sk;
 806         newsk->sk_socket = newsock;
 807         newsk->sk_sleep  = &newsock->wait;
 808
 809         /* Now attach up the new socket */
 810         skb->sk = NULL;
 811         kfree_skb(skb);
 812         sk->sk_ack_backlog--;
 813         newsock->sk    = newsk;
 814         newsock->state = SS_CONNECTED;
 815         rc = 0;
 816 out2:
 817         release_sock(sk);
 818 out:
 819         return rc;
 820 }
 821
 822 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 823                        int *uaddr_len, int peer)
 824 {
 825         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 826         struct sock *sk = sock->sk;
 827         struct x25_sock *x25 = x25_sk(sk);
 828
 829         if (peer) {
 830                 if (sk->sk_state != TCP_ESTABLISHED)
 831                         return -ENOTCONN;
 832                 sx25->sx25_addr = x25->dest_addr;
 833         } else
 834                 sx25->sx25_addr = x25->source_addr;
 835
 836         sx25->sx25_family = AF_X25;
 837         *uaddr_len = sizeof(*sx25);
 838
 839         return 0;
 840 }
 841
 842 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 843                         unsigned int lci)
 844 {
 845         struct sock *sk;
 846         struct sock *make;
 847         struct x25_sock *makex25;
 848         struct x25_address source_addr, dest_addr;
 849         struct x25_facilities facilities;
 850         struct x25_dte_facilities dte_facilities;
 851         int len, rc;
 852
 853         /*
 854          *      Remove the LCI and frame type.
 855          */
 856         skb_pull(skb, X25_STD_MIN_LEN);
 857
 858         /*
 859          *      Extract the X.25 addresses and convert them to ASCII strings,
 860          *      and remove them.
 861          */
 862         skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
 863
 864         /*
 865          *      Get the length of the facilities, skip past them for the moment
 866          *      get the call user data because this is needed to determine
 867          *      the correct listener
 868          */
 869         len = skb->data[0] + 1;
 870         skb_pull(skb,len);
 871
 872         /*
 873          *      Find a listener for the particular address/cud pair.
 874          */
 875         sk = x25_find_listener(&source_addr,skb);
 876         skb_push(skb,len);
 877
 878         /*
 879          *      We can't accept the Call Request.
 880          */
 881         if (sk == NULL || sk_acceptq_is_full(sk))
 882                 goto out_clear_request;
 883
 884         /*
 885          *      Try to reach a compromise on the requested facilities.
 886          */
 887         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 888         if (len == -1)
 889                 goto out_sock_put;
 890
 891         /*
 892          * current neighbour/link might impose additional limits
 893          * on certain facilties
 894          */
 895
 896         x25_limit_facilities(&facilities, nb);
 897
 898         /*
 899          *      Try to create a new socket.
 900          */
 901         make = x25_make_new(sk);
 902         if (!make)
 903                 goto out_sock_put;
 904
 905         /*
 906          *      Remove the facilities
 907          */
 908         skb_pull(skb, len);
 909
 910         skb->sk     = make;
 911         make->sk_state = TCP_ESTABLISHED;
 912
 913         makex25 = x25_sk(make);
 914         makex25->lci           = lci;
 915         makex25->dest_addr     = dest_addr;
 916         makex25->source_addr   = source_addr;
 917         makex25->neighbour     = nb;
 918         makex25->facilities    = facilities;
 919         makex25->dte_facilities= dte_facilities;
 920         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 921         /* ensure no reverse facil on accept */
 922         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 923         /* ensure no calling address extension on accept */
 924         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 925         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 926
 927         /* Normally all calls are accepted immediatly */
 928         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 929                 x25_write_internal(make, X25_CALL_ACCEPTED);
 930                 makex25->state = X25_STATE_3;
 931         }
 932
 933         /*
 934          *      Incoming Call User Data.
 935          */
 936         if (skb->len >= 0) {
 937                 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
 938                 makex25->calluserdata.cudlength = skb->len;
 939         }
 940
 941         sk->sk_ack_backlog++;
 942
 943         x25_insert_socket(make);
 944
 945         skb_queue_head(&sk->sk_receive_queue, skb);
 946
 947         x25_start_heartbeat(make);
 948
 949         if (!sock_flag(sk, SOCK_DEAD))
 950                 sk->sk_data_ready(sk, skb->len);
 951         rc = 1;
 952         sock_put(sk);
 953 out:
 954         return rc;
 955 out_sock_put:
 956         sock_put(sk);
 957 out_clear_request:
 958         rc = 0;
 959         x25_transmit_clear_request(nb, lci, 0x01);
 960         goto out;
 961 }
 962
 963 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 964                        struct msghdr *msg, size_t len)
 965 {
 966         struct sock *sk = sock->sk;
 967         struct x25_sock *x25 = x25_sk(sk);
 968         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 969         struct sockaddr_x25 sx25;
 970         struct sk_buff *skb;
 971         unsigned char *asmptr;
 972         int noblock = msg->msg_flags & MSG_DONTWAIT;
 973         size_t size;
 974         int qbit = 0, rc = -EINVAL;
 975
 976         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 977                 goto out;
 978
 979         /* we currently don't support segmented records at the user interface */
 980         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 981                 goto out;
 982
 983         rc = -EADDRNOTAVAIL;
 984         if (sock_flag(sk, SOCK_ZAPPED))
 985                 goto out;
 986
 987         rc = -EPIPE;
 988         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 989                 send_sig(SIGPIPE, current, 0);
 990                 goto out;
 991         }
 992
 993         rc = -ENETUNREACH;
 994         if (!x25->neighbour)
 995                 goto out;
 996
 997         if (usx25) {
 998                 rc = -EINVAL;
 999                 if (msg->msg_namelen < sizeof(sx25))
1000                         goto out;
1001                 memcpy(&sx25, usx25, sizeof(sx25));
1002                 rc = -EISCONN;
1003                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1004                         goto out;
1005                 rc = -EINVAL;
1006                 if (sx25.sx25_family != AF_X25)
1007                         goto out;
1008         } else {
1009                 /*
1010                  *      FIXME 1003.1g - if the socket is like this because
1011                  *      it has become closed (not started closed) we ought
1012                  *      to SIGPIPE, EPIPE;
1013                  */
1014                 rc = -ENOTCONN;
1015                 if (sk->sk_state != TCP_ESTABLISHED)
1016                         goto out;
1017
1018                 sx25.sx25_family = AF_X25;
1019                 sx25.sx25_addr   = x25->dest_addr;
1020         }
1021
1022         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1023
1024         /* Build a packet */
1025         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1026
1027         if ((msg->msg_flags & MSG_OOB) && len > 32)
1028                 len = 32;
1029
1030         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1031
1032         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1033         if (!skb)
1034                 goto out;
1035         X25_SKB_CB(skb)->flags = msg->msg_flags;
1036
1037         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1038
1039         /*
1040          *      Put the data on the end
1041          */
1042         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1043
1044         asmptr = skb->h.raw = skb_put(skb, len);
1045
1046         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1047         if (rc)
1048                 goto out_kfree_skb;
1049
1050         /*
1051          *      If the Q BIT Include socket option is in force, the first
1052          *      byte of the user data is the logical value of the Q Bit.
1053          */
1054         if (x25->qbitincl) {
1055                 qbit = skb->data[0];
1056                 skb_pull(skb, 1);
1057         }
1058
1059         /*
1060          *      Push down the X.25 header
1061          */
1062         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1063
1064         if (msg->msg_flags & MSG_OOB) {
1065                 if (x25->neighbour->extended) {
1066                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1067                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1068                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1069                         *asmptr++ = X25_INTERRUPT;
1070                 } else {
1071                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1072                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1073                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1074                         *asmptr++ = X25_INTERRUPT;
1075                 }
1076         } else {
1077                 if (x25->neighbour->extended) {
1078                         /* Build an Extended X.25 header */
1079                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1080                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1081                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1082                         *asmptr++ = X25_DATA;
1083                         *asmptr++ = X25_DATA;
1084                 } else {
1085                         /* Build an Standard X.25 header */
1086                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1087                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1088                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1089                         *asmptr++ = X25_DATA;
1090                 }
1091
1092                 if (qbit)
1093                         skb->data[0] |= X25_Q_BIT;
1094         }
1095
1096         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1097         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1098
1099         rc = -ENOTCONN;
1100         if (sk->sk_state != TCP_ESTABLISHED)
1101                 goto out_kfree_skb;
1102
1103         if (msg->msg_flags & MSG_OOB)
1104                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1105         else {
1106                 len = x25_output(sk, skb);
1107                 if (len < 0)
1108                         kfree_skb(skb);
1109                 else if (x25->qbitincl)
1110                         len++;
1111         }
1112
1113         /*
1114          * lock_sock() is currently only used to serialize this x25_kick()
1115          * against input-driven x25_kick() calls. It currently only blocks
1116          * incoming packets for this socket and does not protect against
1117          * any other socket state changes and is not called from anywhere
1118          * else. As x25_kick() cannot block and as long as all socket
1119          * operations are BKL-wrapped, we don't need take to care about
1120          * purging the backlog queue in x25_release().
1121          *
1122          * Using lock_sock() to protect all socket operations entirely
1123          * (and making the whole x25 stack SMP aware) unfortunately would
1124          * require major changes to {send,recv}msg and skb allocation methods.
1125          * -> 2.5 ;)
1126          */
1127         lock_sock(sk);
1128         x25_kick(sk);
1129         release_sock(sk);
1130         rc = len;
1131 out:
1132         return rc;
1133 out_kfree_skb:
1134         kfree_skb(skb);
1135         goto out;
1136 }
1137
1138
1139 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1140                        struct msghdr *msg, size_t size,
1141                        int flags)
1142 {
1143         struct sock *sk = sock->sk;
1144         struct x25_sock *x25 = x25_sk(sk);
1145         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1146         size_t copied;
1147         int qbit;
1148         struct sk_buff *skb;
1149         unsigned char *asmptr;
1150         int rc = -ENOTCONN;
1151
1152         /*
1153          * This works for seqpacket too. The receiver has ordered the queue for
1154          * us! We do one quick check first though
1155          */
1156         if (sk->sk_state != TCP_ESTABLISHED)
1157                 goto out;
1158
1159         if (flags & MSG_OOB) {
1160                 rc = -EINVAL;
1161                 if (sock_flag(sk, SOCK_URGINLINE) ||
1162                     !skb_peek(&x25->interrupt_in_queue))
1163                         goto out;
1164
1165                 skb = skb_dequeue(&x25->interrupt_in_queue);
1166
1167                 skb_pull(skb, X25_STD_MIN_LEN);
1168
1169                 /*
1170                  *      No Q bit information on Interrupt data.
1171                  */
1172                 if (x25->qbitincl) {
1173                         asmptr  = skb_push(skb, 1);
1174                         *asmptr = 0x00;
1175                 }
1176
1177                 msg->msg_flags |= MSG_OOB;
1178         } else {
1179                 /* Now we can treat all alike */
1180                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1181                                         flags & MSG_DONTWAIT, &rc);
1182                 if (!skb)
1183                         goto out;
1184
1185                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1186
1187                 skb_pull(skb, x25->neighbour->extended ?
1188                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1189
1190                 if (x25->qbitincl) {
1191                         asmptr  = skb_push(skb, 1);
1192                         *asmptr = qbit;
1193                 }
1194         }
1195
1196         skb->h.raw = skb->data;
1197
1198         copied = skb->len;
1199
1200         if (copied > size) {
1201                 copied = size;
1202                 msg->msg_flags |= MSG_TRUNC;
1203         }
1204
1205         /* Currently, each datagram always contains a complete record */
1206         msg->msg_flags |= MSG_EOR;
1207
1208         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1209         if (rc)
1210                 goto out_free_dgram;
1211
1212         if (sx25) {
1213                 sx25->sx25_family = AF_X25;
1214                 sx25->sx25_addr   = x25->dest_addr;
1215         }
1216
1217         msg->msg_namelen = sizeof(struct sockaddr_x25);
1218
1219         lock_sock(sk);
1220         x25_check_rbuf(sk);
1221         release_sock(sk);
1222         rc = copied;
1223 out_free_dgram:
1224         skb_free_datagram(sk, skb);
1225 out:
1226         return rc;
1227 }
1228
1229
1230 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1231 {
1232         struct sock *sk = sock->sk;
1233         struct x25_sock *x25 = x25_sk(sk);
1234         void __user *argp = (void __user *)arg;
1235         int rc;
1236
1237         switch (cmd) {
1238                 case TIOCOUTQ: {
1239                         int amount = sk->sk_sndbuf -
1240                                      atomic_read(&sk->sk_wmem_alloc);
1241                         if (amount < 0)
1242                                 amount = 0;
1243                         rc = put_user(amount, (unsigned int __user *)argp);
1244                         break;
1245                 }
1246
1247                 case TIOCINQ: {
1248                         struct sk_buff *skb;
1249                         int amount = 0;
1250                         /*
1251                          * These two are safe on a single CPU system as
1252                          * only user tasks fiddle here
1253                          */
1254                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1255                                 amount = skb->len;
1256                         rc = put_user(amount, (unsigned int __user *)argp);
1257                         break;
1258                 }
1259
1260                 case SIOCGSTAMP:
1261                         rc = -EINVAL;
1262                         if (sk)
1263                                 rc = sock_get_timestamp(sk,
1264                                                 (struct timeval __user *)argp);
1265                         break;
1266                 case SIOCGIFADDR:
1267                 case SIOCSIFADDR:
1268                 case SIOCGIFDSTADDR:
1269                 case SIOCSIFDSTADDR:
1270                 case SIOCGIFBRDADDR:
1271                 case SIOCSIFBRDADDR:
1272                 case SIOCGIFNETMASK:
1273                 case SIOCSIFNETMASK:
1274                 case SIOCGIFMETRIC:
1275                 case SIOCSIFMETRIC:
1276                         rc = -EINVAL;
1277                         break;
1278                 case SIOCADDRT:
1279                 case SIOCDELRT:
1280                         rc = -EPERM;
1281                         if (!capable(CAP_NET_ADMIN))
1282                                 break;
1283                         rc = x25_route_ioctl(cmd, argp);
1284                         break;
1285                 case SIOCX25GSUBSCRIP:
1286                         rc = x25_subscr_ioctl(cmd, argp);
1287                         break;
1288                 case SIOCX25SSUBSCRIP:
1289                         rc = -EPERM;
1290                         if (!capable(CAP_NET_ADMIN))
1291                                 break;
1292                         rc = x25_subscr_ioctl(cmd, argp);
1293                         break;
1294                 case SIOCX25GFACILITIES: {
1295                         struct x25_facilities fac = x25->facilities;
1296                         rc = copy_to_user(argp, &fac,
1297                                           sizeof(fac)) ? -EFAULT : 0;
1298                         break;
1299                 }
1300
1301                 case SIOCX25SFACILITIES: {
1302                         struct x25_facilities facilities;
1303                         rc = -EFAULT;
1304                         if (copy_from_user(&facilities, argp,
1305                                            sizeof(facilities)))
1306                                 break;
1307                         rc = -EINVAL;
1308                         if (sk->sk_state != TCP_LISTEN &&
1309                             sk->sk_state != TCP_CLOSE)
1310                                 break;
1311                         if (facilities.pacsize_in < X25_PS16 ||
1312                             facilities.pacsize_in > X25_PS4096)
1313                                 break;
1314                         if (facilities.pacsize_out < X25_PS16 ||
1315                             facilities.pacsize_out > X25_PS4096)
1316                                 break;
1317                         if (facilities.winsize_in < 1 ||
1318                             facilities.winsize_in > 127)
1319                                 break;
1320                         if (facilities.throughput < 0x03 ||
1321                             facilities.throughput > 0xDD)
1322                                 break;
1323                         if (facilities.reverse &&
1324                                 (facilities.reverse | 0x81)!= 0x81)
1325                                 break;
1326                         x25->facilities = facilities;
1327                         rc = 0;
1328                         break;
1329                 }
1330
1331                 case SIOCX25GDTEFACILITIES: {
1332                         rc = copy_to_user(argp, &x25->dte_facilities,
1333                                                 sizeof(x25->dte_facilities));
1334                         if (rc)
1335                                 rc = -EFAULT;
1336                         break;
1337                 }
1338
1339                 case SIOCX25SDTEFACILITIES: {
1340                         struct x25_dte_facilities dtefacs;
1341                         rc = -EFAULT;
1342                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1343                                 break;
1344                         rc = -EINVAL;
1345                         if (sk->sk_state != TCP_LISTEN &&
1346                                         sk->sk_state != TCP_CLOSE)
1347                                 break;
1348                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1349                                 break;
1350                         if (dtefacs.calling_ae == NULL)
1351                                 break;
1352                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1353                                 break;
1354                         if (dtefacs.called_ae == NULL)
1355                                 break;
1356                         x25->dte_facilities = dtefacs;
1357                         rc = 0;
1358                         break;
1359                 }
1360
1361                 case SIOCX25GCALLUSERDATA: {
1362                         struct x25_calluserdata cud = x25->calluserdata;
1363                         rc = copy_to_user(argp, &cud,
1364                                           sizeof(cud)) ? -EFAULT : 0;
1365                         break;
1366                 }
1367
1368                 case SIOCX25SCALLUSERDATA: {
1369                         struct x25_calluserdata calluserdata;
1370
1371                         rc = -EFAULT;
1372                         if (copy_from_user(&calluserdata, argp,
1373                                            sizeof(calluserdata)))
1374                                 break;
1375                         rc = -EINVAL;
1376                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1377                                 break;
1378                         x25->calluserdata = calluserdata;
1379                         rc = 0;
1380                         break;
1381                 }
1382
1383                 case SIOCX25GCAUSEDIAG: {
1384                         struct x25_causediag causediag;
1385                         causediag = x25->causediag;
1386                         rc = copy_to_user(argp, &causediag,
1387                                           sizeof(causediag)) ? -EFAULT : 0;
1388                         break;
1389                 }
1390
1391                 case SIOCX25SCUDMATCHLEN: {
1392                         struct x25_subaddr sub_addr;
1393                         rc = -EINVAL;
1394                         if(sk->sk_state != TCP_CLOSE)
1395                                 break;
1396                         rc = -EFAULT;
1397                         if (copy_from_user(&sub_addr, argp,
1398                                         sizeof(sub_addr)))
1399                                 break;
1400                         rc = -EINVAL;
1401                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1402                                 break;
1403                         x25->cudmatchlength = sub_addr.cudmatchlength;
1404                         rc = 0;
1405                         break;
1406                 }
1407
1408                 case SIOCX25CALLACCPTAPPRV: {
1409                         rc = -EINVAL;
1410                         if (sk->sk_state != TCP_CLOSE)
1411                                 break;
1412                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1413                         rc = 0;
1414                         break;
1415                 }
1416
1417                 case SIOCX25SENDCALLACCPT:  {
1418                         rc = -EINVAL;
1419                         if (sk->sk_state != TCP_ESTABLISHED)
1420                                 break;
1421                         if (x25->accptapprv)    /* must call accptapprv above */
1422                                 break;
1423                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1424                         x25->state = X25_STATE_3;
1425                         rc = 0;
1426                         break;
1427                 }
1428
1429                 default:
1430                         rc = -ENOIOCTLCMD;
1431                         break;
1432         }
1433
1434         return rc;
1435 }
1436
1437 static struct net_proto_family x25_family_ops = {
1438         .family =       AF_X25,
1439         .create =       x25_create,
1440         .owner  =       THIS_MODULE,
1441 };
1442
1443 #ifdef CONFIG_COMPAT
1444 static int compat_x25_subscr_ioctl(unsigned int cmd,
1445                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1446 {
1447         struct compat_x25_subscrip_struct x25_subscr;
1448         struct x25_neigh *nb;
1449         struct net_device *dev;
1450         int rc = -EINVAL;
1451
1452         rc = -EFAULT;
1453         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1454                 goto out;
1455
1456         rc = -EINVAL;
1457         dev = x25_dev_get(x25_subscr.device);
1458         if (dev == NULL)
1459                 goto out;
1460
1461         nb = x25_get_neigh(dev);
1462         if (nb == NULL)
1463                 goto out_dev_put;
1464
1465         dev_put(dev);
1466
1467         if (cmd == SIOCX25GSUBSCRIP) {
1468                 x25_subscr.extended = nb->extended;
1469                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1470                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1471                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1472         } else {
1473                 rc = -EINVAL;
1474                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1475                         rc = 0;
1476                         nb->extended = x25_subscr.extended;
1477                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1478                 }
1479         }
1480         x25_neigh_put(nb);
1481 out:
1482         return rc;
1483 out_dev_put:
1484         dev_put(dev);
1485         goto out;
1486 }
1487
1488 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1489                                 unsigned long arg)
1490 {
1491         void __user *argp = compat_ptr(arg);
1492         struct sock *sk = sock->sk;
1493
1494         int rc = -ENOIOCTLCMD;
1495
1496         switch(cmd) {
1497         case TIOCOUTQ:
1498         case TIOCINQ:
1499                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1500                 break;
1501         case SIOCGSTAMP:
1502                 rc = -EINVAL;
1503                 if (sk)
1504                         rc = compat_sock_get_timestamp(sk,
1505                                         (struct timeval __user*)argp);
1506                 break;
1507         case SIOCGIFADDR:
1508         case SIOCSIFADDR:
1509         case SIOCGIFDSTADDR:
1510         case SIOCSIFDSTADDR:
1511         case SIOCGIFBRDADDR:
1512         case SIOCSIFBRDADDR:
1513         case SIOCGIFNETMASK:
1514         case SIOCSIFNETMASK:
1515         case SIOCGIFMETRIC:
1516         case SIOCSIFMETRIC:
1517                 rc = -EINVAL;
1518                 break;
1519         case SIOCADDRT:
1520         case SIOCDELRT:
1521                 rc = -EPERM;
1522                 if (!capable(CAP_NET_ADMIN))
1523                         break;
1524                 rc = x25_route_ioctl(cmd, argp);
1525                 break;
1526         case SIOCX25GSUBSCRIP:
1527                 rc = compat_x25_subscr_ioctl(cmd, argp);
1528                 break;
1529         case SIOCX25SSUBSCRIP:
1530                 rc = -EPERM;
1531                 if (!capable(CAP_NET_ADMIN))
1532                         break;
1533                 rc = compat_x25_subscr_ioctl(cmd, argp);
1534                 break;
1535         case SIOCX25GFACILITIES:
1536         case SIOCX25SFACILITIES:
1537         case SIOCX25GDTEFACILITIES:
1538         case SIOCX25SDTEFACILITIES:
1539         case SIOCX25GCALLUSERDATA:
1540         case SIOCX25SCALLUSERDATA:
1541         case SIOCX25GCAUSEDIAG:
1542         case SIOCX25SCUDMATCHLEN:
1543         case SIOCX25CALLACCPTAPPRV:
1544         case SIOCX25SENDCALLACCPT:
1545                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1546                 break;
1547         default:
1548                 rc = -ENOIOCTLCMD;
1549                 break;
1550         }
1551         return rc;
1552 }
1553 #endif
1554
1555 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1556         .family =       AF_X25,
1557         .owner =        THIS_MODULE,
1558         .release =      x25_release,
1559         .bind =         x25_bind,
1560         .connect =      x25_connect,
1561         .socketpair =   sock_no_socketpair,
1562         .accept =       x25_accept,
1563         .getname =      x25_getname,
1564         .poll =         datagram_poll,
1565         .ioctl =        x25_ioctl,
1566 #ifdef CONFIG_COMPAT
1567         .compat_ioctl = compat_x25_ioctl,
1568 #endif
1569         .listen =       x25_listen,
1570         .shutdown =     sock_no_shutdown,
1571         .setsockopt =   x25_setsockopt,
1572         .getsockopt =   x25_getsockopt,
1573         .sendmsg =      x25_sendmsg,
1574         .recvmsg =      x25_recvmsg,
1575         .mmap =         sock_no_mmap,
1576         .sendpage =     sock_no_sendpage,
1577 };
1578
1579 #include <linux/smp_lock.h>
1580 SOCKOPS_WRAP(x25_proto, AF_X25);
1581
1582 static struct packet_type x25_packet_type = {
1583         .type = __constant_htons(ETH_P_X25),
1584         .func = x25_lapb_receive_frame,
1585 };
1586
1587 static struct notifier_block x25_dev_notifier = {
1588         .notifier_call = x25_device_event,
1589 };
1590
1591 void x25_kill_by_neigh(struct x25_neigh *nb)
1592 {
1593         struct sock *s;
1594         struct hlist_node *node;
1595
1596         write_lock_bh(&x25_list_lock);
1597
1598         sk_for_each(s, node, &x25_list)
1599                 if (x25_sk(s)->neighbour == nb)
1600                         x25_disconnect(s, ENETUNREACH, 0, 0);
1601
1602         write_unlock_bh(&x25_list_lock);
1603 }
1604
1605 static int __init x25_init(void)
1606 {
1607         int rc = proto_register(&x25_proto, 0);
1608
1609         if (rc != 0)
1610                 goto out;
1611
1612         sock_register(&x25_family_ops);
1613
1614         dev_add_pack(&x25_packet_type);
1615
1616         register_netdevice_notifier(&x25_dev_notifier);
1617
1618         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1619
1620 #ifdef CONFIG_SYSCTL
1621         x25_register_sysctl();
1622 #endif
1623         x25_proc_init();
1624 out:
1625         return rc;
1626 }
1627 module_init(x25_init);
1628
1629 static void __exit x25_exit(void)
1630 {
1631         x25_proc_exit();
1632         x25_link_free();
1633         x25_route_free();
1634
1635 #ifdef CONFIG_SYSCTL
1636         x25_unregister_sysctl();
1637 #endif
1638
1639         unregister_netdevice_notifier(&x25_dev_notifier);
1640
1641         dev_remove_pack(&x25_packet_type);
1642
1643         sock_unregister(AF_X25);
1644         proto_unregister(&x25_proto);
1645 }
1646 module_exit(x25_exit);
1647
1648 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1649 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1650 MODULE_LICENSE("GPL");
1651 MODULE_ALIAS_NETPROTO(PF_X25);