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 int sysctl_x25_forward                 = 0;
  67
  68 HLIST_HEAD(x25_list);
  69 DEFINE_RWLOCK(x25_list_lock);
  70
  71 static const struct proto_ops x25_proto_ops;
  72
  73 static struct x25_address null_x25_address = {"               "};
  74
  75 #ifdef CONFIG_COMPAT
  76 struct compat_x25_subscrip_struct {
  77         char device[200-sizeof(compat_ulong_t)];
  78         compat_ulong_t global_facil_mask;
  79         compat_uint_t extended;
  80 };
  81 #endif
  82
  83 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  84                   struct x25_address *calling_addr)
  85 {
  86         int called_len, calling_len;
  87         char *called, *calling;
  88         int i;
  89
  90         called_len  = (*p >> 0) & 0x0F;
  91         calling_len = (*p >> 4) & 0x0F;
  92
  93         called  = called_addr->x25_addr;
  94         calling = calling_addr->x25_addr;
  95         p++;
  96
  97         for (i = 0; i < (called_len + calling_len); i++) {
  98                 if (i < called_len) {
  99                         if (i % 2 != 0) {
 100                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 101                                 p++;
 102                         } else {
 103                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 104                         }
 105                 } else {
 106                         if (i % 2 != 0) {
 107                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 108                                 p++;
 109                         } else {
 110                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 111                         }
 112                 }
 113         }
 114
 115         *called = *calling = '\0';
 116
 117         return 1 + (called_len + calling_len + 1) / 2;
 118 }
 119
 120 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 121                   struct x25_address *calling_addr)
 122 {
 123         unsigned int called_len, calling_len;
 124         char *called, *calling;
 125         int i;
 126
 127         called  = called_addr->x25_addr;
 128         calling = calling_addr->x25_addr;
 129
 130         called_len  = strlen(called);
 131         calling_len = strlen(calling);
 132
 133         *p++ = (calling_len << 4) | (called_len << 0);
 134
 135         for (i = 0; i < (called_len + calling_len); i++) {
 136                 if (i < called_len) {
 137                         if (i % 2 != 0) {
 138                                 *p |= (*called++ - '0') << 0;
 139                                 p++;
 140                         } else {
 141                                 *p = 0x00;
 142                                 *p |= (*called++ - '0') << 4;
 143                         }
 144                 } else {
 145                         if (i % 2 != 0) {
 146                                 *p |= (*calling++ - '0') << 0;
 147                                 p++;
 148                         } else {
 149                                 *p = 0x00;
 150                                 *p |= (*calling++ - '0') << 4;
 151                         }
 152                 }
 153         }
 154
 155         return 1 + (called_len + calling_len + 1) / 2;
 156 }
 157
 158 /*
 159  *      Socket removal during an interrupt is now safe.
 160  */
 161 static void x25_remove_socket(struct sock *sk)
 162 {
 163         write_lock_bh(&x25_list_lock);
 164         sk_del_node_init(sk);
 165         write_unlock_bh(&x25_list_lock);
 166 }
 167
 168 /*
 169  *      Kill all bound sockets on a dropped device.
 170  */
 171 static void x25_kill_by_device(struct net_device *dev)
 172 {
 173         struct sock *s;
 174         struct hlist_node *node;
 175
 176         write_lock_bh(&x25_list_lock);
 177
 178         sk_for_each(s, node, &x25_list)
 179                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 180                         x25_disconnect(s, ENETUNREACH, 0, 0);
 181
 182         write_unlock_bh(&x25_list_lock);
 183 }
 184
 185 /*
 186  *      Handle device status changes.
 187  */
 188 static int x25_device_event(struct notifier_block *this, unsigned long event,
 189                             void *ptr)
 190 {
 191         struct net_device *dev = ptr;
 192         struct x25_neigh *nb;
 193
 194         if (dev->type == ARPHRD_X25
 195 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 196          || dev->type == ARPHRD_ETHER
 197 #endif
 198          ) {
 199                 switch (event) {
 200                         case NETDEV_UP:
 201                                 x25_link_device_up(dev);
 202                                 break;
 203                         case NETDEV_GOING_DOWN:
 204                                 nb = x25_get_neigh(dev);
 205                                 if (nb) {
 206                                         x25_terminate_link(nb);
 207                                         x25_neigh_put(nb);
 208                                 }
 209                                 break;
 210                         case NETDEV_DOWN:
 211                                 x25_kill_by_device(dev);
 212                                 x25_route_device_down(dev);
 213                                 x25_link_device_down(dev);
 214                                 break;
 215                 }
 216         }
 217
 218         return NOTIFY_DONE;
 219 }
 220
 221 /*
 222  *      Add a socket to the bound sockets list.
 223  */
 224 static void x25_insert_socket(struct sock *sk)
 225 {
 226         write_lock_bh(&x25_list_lock);
 227         sk_add_node(sk, &x25_list);
 228         write_unlock_bh(&x25_list_lock);
 229 }
 230
 231 /*
 232  *      Find a socket that wants to accept the Call Request we just
 233  *      received. Check the full list for an address/cud match.
 234  *      If no cuds match return the next_best thing, an address match.
 235  *      Note: if a listening socket has cud set it must only get calls
 236  *      with matching cud.
 237  */
 238 static struct sock *x25_find_listener(struct x25_address *addr,
 239                                         struct sk_buff *skb)
 240 {
 241         struct sock *s;
 242         struct sock *next_best;
 243         struct hlist_node *node;
 244
 245         read_lock_bh(&x25_list_lock);
 246         next_best = NULL;
 247
 248         sk_for_each(s, node, &x25_list)
 249                 if ((!strcmp(addr->x25_addr,
 250                         x25_sk(s)->source_addr.x25_addr) ||
 251                                 !strcmp(addr->x25_addr,
 252                                         null_x25_address.x25_addr)) &&
 253                                         s->sk_state == TCP_LISTEN) {
 254                         /*
 255                          * Found a listening socket, now check the incoming
 256                          * call user data vs this sockets call user data
 257                          */
 258                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 259                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 260                                         skb->data,
 261                                         x25_sk(s)->cudmatchlength)) == 0) {
 262                                         sock_hold(s);
 263                                         goto found;
 264                                  }
 265                         } else
 266                                 next_best = s;
 267                 }
 268         if (next_best) {
 269                 s = next_best;
 270                 sock_hold(s);
 271                 goto found;
 272         }
 273         s = NULL;
 274 found:
 275         read_unlock_bh(&x25_list_lock);
 276         return s;
 277 }
 278
 279 /*
 280  *      Find a connected X.25 socket given my LCI and neighbour.
 281  */
 282 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 283 {
 284         struct sock *s;
 285         struct hlist_node *node;
 286
 287         sk_for_each(s, node, &x25_list)
 288                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 289                         sock_hold(s);
 290                         goto found;
 291                 }
 292         s = NULL;
 293 found:
 294         return s;
 295 }
 296
 297 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 298 {
 299         struct sock *s;
 300
 301         read_lock_bh(&x25_list_lock);
 302         s = __x25_find_socket(lci, nb);
 303         read_unlock_bh(&x25_list_lock);
 304         return s;
 305 }
 306
 307 /*
 308  *      Find a unique LCI for a given device.
 309  */
 310 static unsigned int x25_new_lci(struct x25_neigh *nb)
 311 {
 312         unsigned int lci = 1;
 313         struct sock *sk;
 314
 315         read_lock_bh(&x25_list_lock);
 316
 317         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 318                 sock_put(sk);
 319                 if (++lci == 4096) {
 320                         lci = 0;
 321                         break;
 322                 }
 323         }
 324
 325         read_unlock_bh(&x25_list_lock);
 326         return lci;
 327 }
 328
 329 /*
 330  *      Deferred destroy.
 331  */
 332 void x25_destroy_socket(struct sock *);
 333
 334 /*
 335  *      handler for deferred kills.
 336  */
 337 static void x25_destroy_timer(unsigned long data)
 338 {
 339         x25_destroy_socket((struct sock *)data);
 340 }
 341
 342 /*
 343  *      This is called from user mode and the timers. Thus it protects itself
 344  *      against interrupt users but doesn't worry about being called during
 345  *      work. Once it is removed from the queue no interrupt or bottom half
 346  *      will touch it and we are (fairly 8-) ) safe.
 347  *      Not static as it's used by the timer
 348  */
 349 void x25_destroy_socket(struct sock *sk)
 350 {
 351         struct sk_buff *skb;
 352
 353         sock_hold(sk);
 354         lock_sock(sk);
 355         x25_stop_heartbeat(sk);
 356         x25_stop_timer(sk);
 357
 358         x25_remove_socket(sk);
 359         x25_clear_queues(sk);           /* Flush the queues */
 360
 361         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 362                 if (skb->sk != sk) {            /* A pending connection */
 363                         /*
 364                          * Queue the unaccepted socket for death
 365                          */
 366                         sock_set_flag(skb->sk, SOCK_DEAD);
 367                         x25_start_heartbeat(skb->sk);
 368                         x25_sk(skb->sk)->state = X25_STATE_0;
 369                 }
 370
 371                 kfree_skb(skb);
 372         }
 373
 374         if (atomic_read(&sk->sk_wmem_alloc) ||
 375             atomic_read(&sk->sk_rmem_alloc)) {
 376                 /* Defer: outstanding buffers */
 377                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 378                 sk->sk_timer.function = x25_destroy_timer;
 379                 sk->sk_timer.data = (unsigned long)sk;
 380                 add_timer(&sk->sk_timer);
 381         } else {
 382                 /* drop last reference so sock_put will free */
 383                 __sock_put(sk);
 384         }
 385
 386         release_sock(sk);
 387         sock_put(sk);
 388 }
 389
 390 /*
 391  *      Handling for system calls applied via the various interfaces to a
 392  *      X.25 socket object.
 393  */
 394
 395 static int x25_setsockopt(struct socket *sock, int level, int optname,
 396                           char __user *optval, int optlen)
 397 {
 398         int opt;
 399         struct sock *sk = sock->sk;
 400         int rc = -ENOPROTOOPT;
 401
 402         if (level != SOL_X25 || optname != X25_QBITINCL)
 403                 goto out;
 404
 405         rc = -EINVAL;
 406         if (optlen < sizeof(int))
 407                 goto out;
 408
 409         rc = -EFAULT;
 410         if (get_user(opt, (int __user *)optval))
 411                 goto out;
 412
 413         x25_sk(sk)->qbitincl = !!opt;
 414         rc = 0;
 415 out:
 416         return rc;
 417 }
 418
 419 static int x25_getsockopt(struct socket *sock, int level, int optname,
 420                           char __user *optval, int __user *optlen)
 421 {
 422         struct sock *sk = sock->sk;
 423         int val, len, rc = -ENOPROTOOPT;
 424
 425         if (level != SOL_X25 || optname != X25_QBITINCL)
 426                 goto out;
 427
 428         rc = -EFAULT;
 429         if (get_user(len, optlen))
 430                 goto out;
 431
 432         len = min_t(unsigned int, len, sizeof(int));
 433
 434         rc = -EINVAL;
 435         if (len < 0)
 436                 goto out;
 437
 438         rc = -EFAULT;
 439         if (put_user(len, optlen))
 440                 goto out;
 441
 442         val = x25_sk(sk)->qbitincl;
 443         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 444 out:
 445         return rc;
 446 }
 447
 448 static int x25_listen(struct socket *sock, int backlog)
 449 {
 450         struct sock *sk = sock->sk;
 451         int rc = -EOPNOTSUPP;
 452
 453         if (sk->sk_state != TCP_LISTEN) {
 454                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 455                 sk->sk_max_ack_backlog = backlog;
 456                 sk->sk_state           = TCP_LISTEN;
 457                 rc = 0;
 458         }
 459
 460         return rc;
 461 }
 462
 463 static struct proto x25_proto = {
 464         .name     = "X25",
 465         .owner    = THIS_MODULE,
 466         .obj_size = sizeof(struct x25_sock),
 467 };
 468
 469 static struct sock *x25_alloc_socket(void)
 470 {
 471         struct x25_sock *x25;
 472         struct sock *sk = sk_alloc(AF_X25, GFP_ATOMIC, &x25_proto, 1);
 473
 474         if (!sk)
 475                 goto out;
 476
 477         sock_init_data(NULL, sk);
 478
 479         x25 = x25_sk(sk);
 480         skb_queue_head_init(&x25->ack_queue);
 481         skb_queue_head_init(&x25->fragment_queue);
 482         skb_queue_head_init(&x25->interrupt_in_queue);
 483         skb_queue_head_init(&x25->interrupt_out_queue);
 484 out:
 485         return sk;
 486 }
 487
 488 static int x25_create(struct socket *sock, int protocol)
 489 {
 490         struct sock *sk;
 491         struct x25_sock *x25;
 492         int rc = -ESOCKTNOSUPPORT;
 493
 494         if (sock->type != SOCK_SEQPACKET || protocol)
 495                 goto out;
 496
 497         rc = -ENOMEM;
 498         if ((sk = x25_alloc_socket()) == NULL)
 499                 goto out;
 500
 501         x25 = x25_sk(sk);
 502
 503         sock_init_data(sock, sk);
 504
 505         x25_init_timers(sk);
 506
 507         sock->ops    = &x25_proto_ops;
 508         sk->sk_protocol = protocol;
 509         sk->sk_backlog_rcv = x25_backlog_rcv;
 510
 511         x25->t21   = sysctl_x25_call_request_timeout;
 512         x25->t22   = sysctl_x25_reset_request_timeout;
 513         x25->t23   = sysctl_x25_clear_request_timeout;
 514         x25->t2    = sysctl_x25_ack_holdback_timeout;
 515         x25->state = X25_STATE_0;
 516         x25->cudmatchlength = 0;
 517         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 518                                                         /* on call accept   */
 519
 520         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 521         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 522         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 523         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 524         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 525         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 526         x25->dte_facilities.calling_len = 0;
 527         x25->dte_facilities.called_len = 0;
 528         memset(x25->dte_facilities.called_ae, '\0',
 529                         sizeof(x25->dte_facilities.called_ae));
 530         memset(x25->dte_facilities.calling_ae, '\0',
 531                         sizeof(x25->dte_facilities.calling_ae));
 532
 533         rc = 0;
 534 out:
 535         return rc;
 536 }
 537
 538 static struct sock *x25_make_new(struct sock *osk)
 539 {
 540         struct sock *sk = NULL;
 541         struct x25_sock *x25, *ox25;
 542
 543         if (osk->sk_type != SOCK_SEQPACKET)
 544                 goto out;
 545
 546         if ((sk = x25_alloc_socket()) == NULL)
 547                 goto out;
 548
 549         x25 = x25_sk(sk);
 550
 551         sk->sk_type        = osk->sk_type;
 552         sk->sk_socket      = osk->sk_socket;
 553         sk->sk_priority    = osk->sk_priority;
 554         sk->sk_protocol    = osk->sk_protocol;
 555         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 556         sk->sk_sndbuf      = osk->sk_sndbuf;
 557         sk->sk_state       = TCP_ESTABLISHED;
 558         sk->sk_sleep       = osk->sk_sleep;
 559         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 560         sock_copy_flags(sk, osk);
 561
 562         ox25 = x25_sk(osk);
 563         x25->t21        = ox25->t21;
 564         x25->t22        = ox25->t22;
 565         x25->t23        = ox25->t23;
 566         x25->t2         = ox25->t2;
 567         x25->facilities = ox25->facilities;
 568         x25->qbitincl   = ox25->qbitincl;
 569         x25->dte_facilities = ox25->dte_facilities;
 570         x25->cudmatchlength = ox25->cudmatchlength;
 571         x25->accptapprv = ox25->accptapprv;
 572
 573         x25_init_timers(sk);
 574 out:
 575         return sk;
 576 }
 577
 578 static int x25_release(struct socket *sock)
 579 {
 580         struct sock *sk = sock->sk;
 581         struct x25_sock *x25;
 582
 583         if (!sk)
 584                 goto out;
 585
 586         x25 = x25_sk(sk);
 587
 588         switch (x25->state) {
 589
 590                 case X25_STATE_0:
 591                 case X25_STATE_2:
 592                         x25_disconnect(sk, 0, 0, 0);
 593                         x25_destroy_socket(sk);
 594                         goto out;
 595
 596                 case X25_STATE_1:
 597                 case X25_STATE_3:
 598                 case X25_STATE_4:
 599                         x25_clear_queues(sk);
 600                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 601                         x25_start_t23timer(sk);
 602                         x25->state = X25_STATE_2;
 603                         sk->sk_state    = TCP_CLOSE;
 604                         sk->sk_shutdown |= SEND_SHUTDOWN;
 605                         sk->sk_state_change(sk);
 606                         sock_set_flag(sk, SOCK_DEAD);
 607                         sock_set_flag(sk, SOCK_DESTROY);
 608                         break;
 609         }
 610
 611         sock->sk        = NULL;
 612         sk->sk_socket   = NULL; /* Not used, but we should do this */
 613 out:
 614         return 0;
 615 }
 616
 617 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 618 {
 619         struct sock *sk = sock->sk;
 620         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 621
 622         if (!sock_flag(sk, SOCK_ZAPPED) ||
 623             addr_len != sizeof(struct sockaddr_x25) ||
 624             addr->sx25_family != AF_X25)
 625                 return -EINVAL;
 626
 627         x25_sk(sk)->source_addr = addr->sx25_addr;
 628         x25_insert_socket(sk);
 629         sock_reset_flag(sk, SOCK_ZAPPED);
 630         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 631
 632         return 0;
 633 }
 634
 635 static int x25_wait_for_connection_establishment(struct sock *sk)
 636 {
 637         DECLARE_WAITQUEUE(wait, current);
 638         int rc;
 639
 640         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 641         for (;;) {
 642                 __set_current_state(TASK_INTERRUPTIBLE);
 643                 rc = -ERESTARTSYS;
 644                 if (signal_pending(current))
 645                         break;
 646                 rc = sock_error(sk);
 647                 if (rc) {
 648                         sk->sk_socket->state = SS_UNCONNECTED;
 649                         break;
 650                 }
 651                 rc = 0;
 652                 if (sk->sk_state != TCP_ESTABLISHED) {
 653                         release_sock(sk);
 654                         schedule();
 655                         lock_sock(sk);
 656                 } else
 657                         break;
 658         }
 659         __set_current_state(TASK_RUNNING);
 660         remove_wait_queue(sk->sk_sleep, &wait);
 661         return rc;
 662 }
 663
 664 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 665                        int addr_len, int flags)
 666 {
 667         struct sock *sk = sock->sk;
 668         struct x25_sock *x25 = x25_sk(sk);
 669         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 670         struct x25_route *rt;
 671         int rc = 0;
 672
 673         lock_sock(sk);
 674         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 675                 sock->state = SS_CONNECTED;
 676                 goto out; /* Connect completed during a ERESTARTSYS event */
 677         }
 678
 679         rc = -ECONNREFUSED;
 680         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 681                 sock->state = SS_UNCONNECTED;
 682                 goto out;
 683         }
 684
 685         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 686         if (sk->sk_state == TCP_ESTABLISHED)
 687                 goto out;
 688
 689         sk->sk_state   = TCP_CLOSE;
 690         sock->state = SS_UNCONNECTED;
 691
 692         rc = -EINVAL;
 693         if (addr_len != sizeof(struct sockaddr_x25) ||
 694             addr->sx25_family != AF_X25)
 695                 goto out;
 696
 697         rc = -ENETUNREACH;
 698         rt = x25_get_route(&addr->sx25_addr);
 699         if (!rt)
 700                 goto out;
 701
 702         x25->neighbour = x25_get_neigh(rt->dev);
 703         if (!x25->neighbour)
 704                 goto out_put_route;
 705
 706         x25_limit_facilities(&x25->facilities, x25->neighbour);
 707
 708         x25->lci = x25_new_lci(x25->neighbour);
 709         if (!x25->lci)
 710                 goto out_put_neigh;
 711
 712         rc = -EINVAL;
 713         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 714                 goto out_put_neigh;
 715
 716         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 717                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 718
 719         x25->dest_addr = addr->sx25_addr;
 720
 721         /* Move to connecting socket, start sending Connect Requests */
 722         sock->state   = SS_CONNECTING;
 723         sk->sk_state  = TCP_SYN_SENT;
 724
 725         x25->state = X25_STATE_1;
 726
 727         x25_write_internal(sk, X25_CALL_REQUEST);
 728
 729         x25_start_heartbeat(sk);
 730         x25_start_t21timer(sk);
 731
 732         /* Now the loop */
 733         rc = -EINPROGRESS;
 734         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 735                 goto out_put_neigh;
 736
 737         rc = x25_wait_for_connection_establishment(sk);
 738         if (rc)
 739                 goto out_put_neigh;
 740
 741         sock->state = SS_CONNECTED;
 742         rc = 0;
 743 out_put_neigh:
 744         if (rc)
 745                 x25_neigh_put(x25->neighbour);
 746 out_put_route:
 747         x25_route_put(rt);
 748 out:
 749         release_sock(sk);
 750         return rc;
 751 }
 752
 753 static int x25_wait_for_data(struct sock *sk, long timeout)
 754 {
 755         DECLARE_WAITQUEUE(wait, current);
 756         int rc = 0;
 757
 758         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 759         for (;;) {
 760                 __set_current_state(TASK_INTERRUPTIBLE);
 761                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 762                         break;
 763                 rc = -ERESTARTSYS;
 764                 if (signal_pending(current))
 765                         break;
 766                 rc = -EAGAIN;
 767                 if (!timeout)
 768                         break;
 769                 rc = 0;
 770                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 771                         release_sock(sk);
 772                         timeout = schedule_timeout(timeout);
 773                         lock_sock(sk);
 774                 } else
 775                         break;
 776         }
 777         __set_current_state(TASK_RUNNING);
 778         remove_wait_queue(sk->sk_sleep, &wait);
 779         return rc;
 780 }
 781
 782 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 783 {
 784         struct sock *sk = sock->sk;
 785         struct sock *newsk;
 786         struct sk_buff *skb;
 787         int rc = -EINVAL;
 788
 789         if (!sk || sk->sk_state != TCP_LISTEN)
 790                 goto out;
 791
 792         rc = -EOPNOTSUPP;
 793         if (sk->sk_type != SOCK_SEQPACKET)
 794                 goto out;
 795
 796         lock_sock(sk);
 797         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 798         if (rc)
 799                 goto out2;
 800         skb = skb_dequeue(&sk->sk_receive_queue);
 801         rc = -EINVAL;
 802         if (!skb->sk)
 803                 goto out2;
 804         newsk            = skb->sk;
 805         newsk->sk_socket = newsock;
 806         newsk->sk_sleep  = &newsock->wait;
 807
 808         /* Now attach up the new socket */
 809         skb->sk = NULL;
 810         kfree_skb(skb);
 811         sk->sk_ack_backlog--;
 812         newsock->sk    = newsk;
 813         newsock->state = SS_CONNECTED;
 814         rc = 0;
 815 out2:
 816         release_sock(sk);
 817 out:
 818         return rc;
 819 }
 820
 821 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 822                        int *uaddr_len, int peer)
 823 {
 824         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 825         struct sock *sk = sock->sk;
 826         struct x25_sock *x25 = x25_sk(sk);
 827
 828         if (peer) {
 829                 if (sk->sk_state != TCP_ESTABLISHED)
 830                         return -ENOTCONN;
 831                 sx25->sx25_addr = x25->dest_addr;
 832         } else
 833                 sx25->sx25_addr = x25->source_addr;
 834
 835         sx25->sx25_family = AF_X25;
 836         *uaddr_len = sizeof(*sx25);
 837
 838         return 0;
 839 }
 840
 841 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 842                         unsigned int lci)
 843 {
 844         struct sock *sk;
 845         struct sock *make;
 846         struct x25_sock *makex25;
 847         struct x25_address source_addr, dest_addr;
 848         struct x25_facilities facilities;
 849         struct x25_dte_facilities dte_facilities;
 850         int len, addr_len, rc;
 851
 852         /*
 853          *      Remove the LCI and frame type.
 854          */
 855         skb_pull(skb, X25_STD_MIN_LEN);
 856
 857         /*
 858          *      Extract the X.25 addresses and convert them to ASCII strings,
 859          *      and remove them.
 860          */
 861         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 862         skb_pull(skb, addr_len);
 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         if (sk != NULL && sk_acceptq_is_full(sk)) {
 879                 goto out_sock_put;
 880         }
 881
 882         /*
 883          *      We dont have any listeners for this incoming call.
 884          *      Try forwarding it.
 885          */
 886         if (sk == NULL) {
 887                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 888                 if (sysctl_x25_forward &&
 889                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 890                 {
 891                         /* Call was forwarded, dont process it any more */
 892                         kfree_skb(skb);
 893                         rc = 1;
 894                         goto out;
 895                 } else {
 896                         /* No listeners, can't forward, clear the call */
 897                         goto out_clear_request;
 898                 }
 899         }
 900
 901         /*
 902          *      Try to reach a compromise on the requested facilities.
 903          */
 904         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 905         if (len == -1)
 906                 goto out_sock_put;
 907
 908         /*
 909          * current neighbour/link might impose additional limits
 910          * on certain facilties
 911          */
 912
 913         x25_limit_facilities(&facilities, nb);
 914
 915         /*
 916          *      Try to create a new socket.
 917          */
 918         make = x25_make_new(sk);
 919         if (!make)
 920                 goto out_sock_put;
 921
 922         /*
 923          *      Remove the facilities
 924          */
 925         skb_pull(skb, len);
 926
 927         skb->sk     = make;
 928         make->sk_state = TCP_ESTABLISHED;
 929
 930         makex25 = x25_sk(make);
 931         makex25->lci           = lci;
 932         makex25->dest_addr     = dest_addr;
 933         makex25->source_addr   = source_addr;
 934         makex25->neighbour     = nb;
 935         makex25->facilities    = facilities;
 936         makex25->dte_facilities= dte_facilities;
 937         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 938         /* ensure no reverse facil on accept */
 939         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 940         /* ensure no calling address extension on accept */
 941         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 942         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 943
 944         /* Normally all calls are accepted immediatly */
 945         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 946                 x25_write_internal(make, X25_CALL_ACCEPTED);
 947                 makex25->state = X25_STATE_3;
 948         }
 949
 950         /*
 951          *      Incoming Call User Data.
 952          */
 953         if (skb->len >= 0) {
 954                 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
 955                 makex25->calluserdata.cudlength = skb->len;
 956         }
 957
 958         sk->sk_ack_backlog++;
 959
 960         x25_insert_socket(make);
 961
 962         skb_queue_head(&sk->sk_receive_queue, skb);
 963
 964         x25_start_heartbeat(make);
 965
 966         if (!sock_flag(sk, SOCK_DEAD))
 967                 sk->sk_data_ready(sk, skb->len);
 968         rc = 1;
 969         sock_put(sk);
 970 out:
 971         return rc;
 972 out_sock_put:
 973         sock_put(sk);
 974 out_clear_request:
 975         rc = 0;
 976         x25_transmit_clear_request(nb, lci, 0x01);
 977         goto out;
 978 }
 979
 980 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 981                        struct msghdr *msg, size_t len)
 982 {
 983         struct sock *sk = sock->sk;
 984         struct x25_sock *x25 = x25_sk(sk);
 985         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 986         struct sockaddr_x25 sx25;
 987         struct sk_buff *skb;
 988         unsigned char *asmptr;
 989         int noblock = msg->msg_flags & MSG_DONTWAIT;
 990         size_t size;
 991         int qbit = 0, rc = -EINVAL;
 992
 993         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 994                 goto out;
 995
 996         /* we currently don't support segmented records at the user interface */
 997         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 998                 goto out;
 999
1000         rc = -EADDRNOTAVAIL;
1001         if (sock_flag(sk, SOCK_ZAPPED))
1002                 goto out;
1003
1004         rc = -EPIPE;
1005         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1006                 send_sig(SIGPIPE, current, 0);
1007                 goto out;
1008         }
1009
1010         rc = -ENETUNREACH;
1011         if (!x25->neighbour)
1012                 goto out;
1013
1014         if (usx25) {
1015                 rc = -EINVAL;
1016                 if (msg->msg_namelen < sizeof(sx25))
1017                         goto out;
1018                 memcpy(&sx25, usx25, sizeof(sx25));
1019                 rc = -EISCONN;
1020                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1021                         goto out;
1022                 rc = -EINVAL;
1023                 if (sx25.sx25_family != AF_X25)
1024                         goto out;
1025         } else {
1026                 /*
1027                  *      FIXME 1003.1g - if the socket is like this because
1028                  *      it has become closed (not started closed) we ought
1029                  *      to SIGPIPE, EPIPE;
1030                  */
1031                 rc = -ENOTCONN;
1032                 if (sk->sk_state != TCP_ESTABLISHED)
1033                         goto out;
1034
1035                 sx25.sx25_family = AF_X25;
1036                 sx25.sx25_addr   = x25->dest_addr;
1037         }
1038
1039         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1040
1041         /* Build a packet */
1042         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1043
1044         if ((msg->msg_flags & MSG_OOB) && len > 32)
1045                 len = 32;
1046
1047         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1048
1049         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1050         if (!skb)
1051                 goto out;
1052         X25_SKB_CB(skb)->flags = msg->msg_flags;
1053
1054         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1055
1056         /*
1057          *      Put the data on the end
1058          */
1059         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1060
1061         asmptr = skb->h.raw = skb_put(skb, len);
1062
1063         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1064         if (rc)
1065                 goto out_kfree_skb;
1066
1067         /*
1068          *      If the Q BIT Include socket option is in force, the first
1069          *      byte of the user data is the logical value of the Q Bit.
1070          */
1071         if (x25->qbitincl) {
1072                 qbit = skb->data[0];
1073                 skb_pull(skb, 1);
1074         }
1075
1076         /*
1077          *      Push down the X.25 header
1078          */
1079         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1080
1081         if (msg->msg_flags & MSG_OOB) {
1082                 if (x25->neighbour->extended) {
1083                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1084                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1085                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1086                         *asmptr++ = X25_INTERRUPT;
1087                 } else {
1088                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1089                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1090                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1091                         *asmptr++ = X25_INTERRUPT;
1092                 }
1093         } else {
1094                 if (x25->neighbour->extended) {
1095                         /* Build an Extended X.25 header */
1096                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1097                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1098                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1099                         *asmptr++ = X25_DATA;
1100                         *asmptr++ = X25_DATA;
1101                 } else {
1102                         /* Build an Standard X.25 header */
1103                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1104                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1105                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1106                         *asmptr++ = X25_DATA;
1107                 }
1108
1109                 if (qbit)
1110                         skb->data[0] |= X25_Q_BIT;
1111         }
1112
1113         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1114         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1115
1116         rc = -ENOTCONN;
1117         if (sk->sk_state != TCP_ESTABLISHED)
1118                 goto out_kfree_skb;
1119
1120         if (msg->msg_flags & MSG_OOB)
1121                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1122         else {
1123                 len = x25_output(sk, skb);
1124                 if (len < 0)
1125                         kfree_skb(skb);
1126                 else if (x25->qbitincl)
1127                         len++;
1128         }
1129
1130         /*
1131          * lock_sock() is currently only used to serialize this x25_kick()
1132          * against input-driven x25_kick() calls. It currently only blocks
1133          * incoming packets for this socket and does not protect against
1134          * any other socket state changes and is not called from anywhere
1135          * else. As x25_kick() cannot block and as long as all socket
1136          * operations are BKL-wrapped, we don't need take to care about
1137          * purging the backlog queue in x25_release().
1138          *
1139          * Using lock_sock() to protect all socket operations entirely
1140          * (and making the whole x25 stack SMP aware) unfortunately would
1141          * require major changes to {send,recv}msg and skb allocation methods.
1142          * -> 2.5 ;)
1143          */
1144         lock_sock(sk);
1145         x25_kick(sk);
1146         release_sock(sk);
1147         rc = len;
1148 out:
1149         return rc;
1150 out_kfree_skb:
1151         kfree_skb(skb);
1152         goto out;
1153 }
1154
1155
1156 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1157                        struct msghdr *msg, size_t size,
1158                        int flags)
1159 {
1160         struct sock *sk = sock->sk;
1161         struct x25_sock *x25 = x25_sk(sk);
1162         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1163         size_t copied;
1164         int qbit;
1165         struct sk_buff *skb;
1166         unsigned char *asmptr;
1167         int rc = -ENOTCONN;
1168
1169         /*
1170          * This works for seqpacket too. The receiver has ordered the queue for
1171          * us! We do one quick check first though
1172          */
1173         if (sk->sk_state != TCP_ESTABLISHED)
1174                 goto out;
1175
1176         if (flags & MSG_OOB) {
1177                 rc = -EINVAL;
1178                 if (sock_flag(sk, SOCK_URGINLINE) ||
1179                     !skb_peek(&x25->interrupt_in_queue))
1180                         goto out;
1181
1182                 skb = skb_dequeue(&x25->interrupt_in_queue);
1183
1184                 skb_pull(skb, X25_STD_MIN_LEN);
1185
1186                 /*
1187                  *      No Q bit information on Interrupt data.
1188                  */
1189                 if (x25->qbitincl) {
1190                         asmptr  = skb_push(skb, 1);
1191                         *asmptr = 0x00;
1192                 }
1193
1194                 msg->msg_flags |= MSG_OOB;
1195         } else {
1196                 /* Now we can treat all alike */
1197                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1198                                         flags & MSG_DONTWAIT, &rc);
1199                 if (!skb)
1200                         goto out;
1201
1202                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1203
1204                 skb_pull(skb, x25->neighbour->extended ?
1205                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1206
1207                 if (x25->qbitincl) {
1208                         asmptr  = skb_push(skb, 1);
1209                         *asmptr = qbit;
1210                 }
1211         }
1212
1213         skb->h.raw = skb->data;
1214
1215         copied = skb->len;
1216
1217         if (copied > size) {
1218                 copied = size;
1219                 msg->msg_flags |= MSG_TRUNC;
1220         }
1221
1222         /* Currently, each datagram always contains a complete record */
1223         msg->msg_flags |= MSG_EOR;
1224
1225         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1226         if (rc)
1227                 goto out_free_dgram;
1228
1229         if (sx25) {
1230                 sx25->sx25_family = AF_X25;
1231                 sx25->sx25_addr   = x25->dest_addr;
1232         }
1233
1234         msg->msg_namelen = sizeof(struct sockaddr_x25);
1235
1236         lock_sock(sk);
1237         x25_check_rbuf(sk);
1238         release_sock(sk);
1239         rc = copied;
1240 out_free_dgram:
1241         skb_free_datagram(sk, skb);
1242 out:
1243         return rc;
1244 }
1245
1246
1247 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1248 {
1249         struct sock *sk = sock->sk;
1250         struct x25_sock *x25 = x25_sk(sk);
1251         void __user *argp = (void __user *)arg;
1252         int rc;
1253
1254         switch (cmd) {
1255                 case TIOCOUTQ: {
1256                         int amount = sk->sk_sndbuf -
1257                                      atomic_read(&sk->sk_wmem_alloc);
1258                         if (amount < 0)
1259                                 amount = 0;
1260                         rc = put_user(amount, (unsigned int __user *)argp);
1261                         break;
1262                 }
1263
1264                 case TIOCINQ: {
1265                         struct sk_buff *skb;
1266                         int amount = 0;
1267                         /*
1268                          * These two are safe on a single CPU system as
1269                          * only user tasks fiddle here
1270                          */
1271                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1272                                 amount = skb->len;
1273                         rc = put_user(amount, (unsigned int __user *)argp);
1274                         break;
1275                 }
1276
1277                 case SIOCGSTAMP:
1278                         rc = -EINVAL;
1279                         if (sk)
1280                                 rc = sock_get_timestamp(sk,
1281                                                 (struct timeval __user *)argp);
1282                         break;
1283                 case SIOCGIFADDR:
1284                 case SIOCSIFADDR:
1285                 case SIOCGIFDSTADDR:
1286                 case SIOCSIFDSTADDR:
1287                 case SIOCGIFBRDADDR:
1288                 case SIOCSIFBRDADDR:
1289                 case SIOCGIFNETMASK:
1290                 case SIOCSIFNETMASK:
1291                 case SIOCGIFMETRIC:
1292                 case SIOCSIFMETRIC:
1293                         rc = -EINVAL;
1294                         break;
1295                 case SIOCADDRT:
1296                 case SIOCDELRT:
1297                         rc = -EPERM;
1298                         if (!capable(CAP_NET_ADMIN))
1299                                 break;
1300                         rc = x25_route_ioctl(cmd, argp);
1301                         break;
1302                 case SIOCX25GSUBSCRIP:
1303                         rc = x25_subscr_ioctl(cmd, argp);
1304                         break;
1305                 case SIOCX25SSUBSCRIP:
1306                         rc = -EPERM;
1307                         if (!capable(CAP_NET_ADMIN))
1308                                 break;
1309                         rc = x25_subscr_ioctl(cmd, argp);
1310                         break;
1311                 case SIOCX25GFACILITIES: {
1312                         struct x25_facilities fac = x25->facilities;
1313                         rc = copy_to_user(argp, &fac,
1314                                           sizeof(fac)) ? -EFAULT : 0;
1315                         break;
1316                 }
1317
1318                 case SIOCX25SFACILITIES: {
1319                         struct x25_facilities facilities;
1320                         rc = -EFAULT;
1321                         if (copy_from_user(&facilities, argp,
1322                                            sizeof(facilities)))
1323                                 break;
1324                         rc = -EINVAL;
1325                         if (sk->sk_state != TCP_LISTEN &&
1326                             sk->sk_state != TCP_CLOSE)
1327                                 break;
1328                         if (facilities.pacsize_in < X25_PS16 ||
1329                             facilities.pacsize_in > X25_PS4096)
1330                                 break;
1331                         if (facilities.pacsize_out < X25_PS16 ||
1332                             facilities.pacsize_out > X25_PS4096)
1333                                 break;
1334                         if (facilities.winsize_in < 1 ||
1335                             facilities.winsize_in > 127)
1336                                 break;
1337                         if (facilities.throughput < 0x03 ||
1338                             facilities.throughput > 0xDD)
1339                                 break;
1340                         if (facilities.reverse &&
1341                                 (facilities.reverse | 0x81)!= 0x81)
1342                                 break;
1343                         x25->facilities = facilities;
1344                         rc = 0;
1345                         break;
1346                 }
1347
1348                 case SIOCX25GDTEFACILITIES: {
1349                         rc = copy_to_user(argp, &x25->dte_facilities,
1350                                                 sizeof(x25->dte_facilities));
1351                         if (rc)
1352                                 rc = -EFAULT;
1353                         break;
1354                 }
1355
1356                 case SIOCX25SDTEFACILITIES: {
1357                         struct x25_dte_facilities dtefacs;
1358                         rc = -EFAULT;
1359                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1360                                 break;
1361                         rc = -EINVAL;
1362                         if (sk->sk_state != TCP_LISTEN &&
1363                                         sk->sk_state != TCP_CLOSE)
1364                                 break;
1365                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1366                                 break;
1367                         if (dtefacs.calling_ae == NULL)
1368                                 break;
1369                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1370                                 break;
1371                         if (dtefacs.called_ae == NULL)
1372                                 break;
1373                         x25->dte_facilities = dtefacs;
1374                         rc = 0;
1375                         break;
1376                 }
1377
1378                 case SIOCX25GCALLUSERDATA: {
1379                         struct x25_calluserdata cud = x25->calluserdata;
1380                         rc = copy_to_user(argp, &cud,
1381                                           sizeof(cud)) ? -EFAULT : 0;
1382                         break;
1383                 }
1384
1385                 case SIOCX25SCALLUSERDATA: {
1386                         struct x25_calluserdata calluserdata;
1387
1388                         rc = -EFAULT;
1389                         if (copy_from_user(&calluserdata, argp,
1390                                            sizeof(calluserdata)))
1391                                 break;
1392                         rc = -EINVAL;
1393                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1394                                 break;
1395                         x25->calluserdata = calluserdata;
1396                         rc = 0;
1397                         break;
1398                 }
1399
1400                 case SIOCX25GCAUSEDIAG: {
1401                         struct x25_causediag causediag;
1402                         causediag = x25->causediag;
1403                         rc = copy_to_user(argp, &causediag,
1404                                           sizeof(causediag)) ? -EFAULT : 0;
1405                         break;
1406                 }
1407
1408                 case SIOCX25SCUDMATCHLEN: {
1409                         struct x25_subaddr sub_addr;
1410                         rc = -EINVAL;
1411                         if(sk->sk_state != TCP_CLOSE)
1412                                 break;
1413                         rc = -EFAULT;
1414                         if (copy_from_user(&sub_addr, argp,
1415                                         sizeof(sub_addr)))
1416                                 break;
1417                         rc = -EINVAL;
1418                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1419                                 break;
1420                         x25->cudmatchlength = sub_addr.cudmatchlength;
1421                         rc = 0;
1422                         break;
1423                 }
1424
1425                 case SIOCX25CALLACCPTAPPRV: {
1426                         rc = -EINVAL;
1427                         if (sk->sk_state != TCP_CLOSE)
1428                                 break;
1429                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1430                         rc = 0;
1431                         break;
1432                 }
1433
1434                 case SIOCX25SENDCALLACCPT:  {
1435                         rc = -EINVAL;
1436                         if (sk->sk_state != TCP_ESTABLISHED)
1437                                 break;
1438                         if (x25->accptapprv)    /* must call accptapprv above */
1439                                 break;
1440                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1441                         x25->state = X25_STATE_3;
1442                         rc = 0;
1443                         break;
1444                 }
1445
1446                 default:
1447                         rc = -ENOIOCTLCMD;
1448                         break;
1449         }
1450
1451         return rc;
1452 }
1453
1454 static struct net_proto_family x25_family_ops = {
1455         .family =       AF_X25,
1456         .create =       x25_create,
1457         .owner  =       THIS_MODULE,
1458 };
1459
1460 #ifdef CONFIG_COMPAT
1461 static int compat_x25_subscr_ioctl(unsigned int cmd,
1462                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1463 {
1464         struct compat_x25_subscrip_struct x25_subscr;
1465         struct x25_neigh *nb;
1466         struct net_device *dev;
1467         int rc = -EINVAL;
1468
1469         rc = -EFAULT;
1470         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1471                 goto out;
1472
1473         rc = -EINVAL;
1474         dev = x25_dev_get(x25_subscr.device);
1475         if (dev == NULL)
1476                 goto out;
1477
1478         nb = x25_get_neigh(dev);
1479         if (nb == NULL)
1480                 goto out_dev_put;
1481
1482         dev_put(dev);
1483
1484         if (cmd == SIOCX25GSUBSCRIP) {
1485                 x25_subscr.extended = nb->extended;
1486                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1487                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1488                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1489         } else {
1490                 rc = -EINVAL;
1491                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1492                         rc = 0;
1493                         nb->extended = x25_subscr.extended;
1494                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1495                 }
1496         }
1497         x25_neigh_put(nb);
1498 out:
1499         return rc;
1500 out_dev_put:
1501         dev_put(dev);
1502         goto out;
1503 }
1504
1505 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1506                                 unsigned long arg)
1507 {
1508         void __user *argp = compat_ptr(arg);
1509         struct sock *sk = sock->sk;
1510
1511         int rc = -ENOIOCTLCMD;
1512
1513         switch(cmd) {
1514         case TIOCOUTQ:
1515         case TIOCINQ:
1516                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1517                 break;
1518         case SIOCGSTAMP:
1519                 rc = -EINVAL;
1520                 if (sk)
1521                         rc = compat_sock_get_timestamp(sk,
1522                                         (struct timeval __user*)argp);
1523                 break;
1524         case SIOCGIFADDR:
1525         case SIOCSIFADDR:
1526         case SIOCGIFDSTADDR:
1527         case SIOCSIFDSTADDR:
1528         case SIOCGIFBRDADDR:
1529         case SIOCSIFBRDADDR:
1530         case SIOCGIFNETMASK:
1531         case SIOCSIFNETMASK:
1532         case SIOCGIFMETRIC:
1533         case SIOCSIFMETRIC:
1534                 rc = -EINVAL;
1535                 break;
1536         case SIOCADDRT:
1537         case SIOCDELRT:
1538                 rc = -EPERM;
1539                 if (!capable(CAP_NET_ADMIN))
1540                         break;
1541                 rc = x25_route_ioctl(cmd, argp);
1542                 break;
1543         case SIOCX25GSUBSCRIP:
1544                 rc = compat_x25_subscr_ioctl(cmd, argp);
1545                 break;
1546         case SIOCX25SSUBSCRIP:
1547                 rc = -EPERM;
1548                 if (!capable(CAP_NET_ADMIN))
1549                         break;
1550                 rc = compat_x25_subscr_ioctl(cmd, argp);
1551                 break;
1552         case SIOCX25GFACILITIES:
1553         case SIOCX25SFACILITIES:
1554         case SIOCX25GDTEFACILITIES:
1555         case SIOCX25SDTEFACILITIES:
1556         case SIOCX25GCALLUSERDATA:
1557         case SIOCX25SCALLUSERDATA:
1558         case SIOCX25GCAUSEDIAG:
1559         case SIOCX25SCUDMATCHLEN:
1560         case SIOCX25CALLACCPTAPPRV:
1561         case SIOCX25SENDCALLACCPT:
1562                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1563                 break;
1564         default:
1565                 rc = -ENOIOCTLCMD;
1566                 break;
1567         }
1568         return rc;
1569 }
1570 #endif
1571
1572 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1573         .family =       AF_X25,
1574         .owner =        THIS_MODULE,
1575         .release =      x25_release,
1576         .bind =         x25_bind,
1577         .connect =      x25_connect,
1578         .socketpair =   sock_no_socketpair,
1579         .accept =       x25_accept,
1580         .getname =      x25_getname,
1581         .poll =         datagram_poll,
1582         .ioctl =        x25_ioctl,
1583 #ifdef CONFIG_COMPAT
1584         .compat_ioctl = compat_x25_ioctl,
1585 #endif
1586         .listen =       x25_listen,
1587         .shutdown =     sock_no_shutdown,
1588         .setsockopt =   x25_setsockopt,
1589         .getsockopt =   x25_getsockopt,
1590         .sendmsg =      x25_sendmsg,
1591         .recvmsg =      x25_recvmsg,
1592         .mmap =         sock_no_mmap,
1593         .sendpage =     sock_no_sendpage,
1594 };
1595
1596 #include <linux/smp_lock.h>
1597 SOCKOPS_WRAP(x25_proto, AF_X25);
1598
1599 static struct packet_type x25_packet_type = {
1600         .type = __constant_htons(ETH_P_X25),
1601         .func = x25_lapb_receive_frame,
1602 };
1603
1604 static struct notifier_block x25_dev_notifier = {
1605         .notifier_call = x25_device_event,
1606 };
1607
1608 void x25_kill_by_neigh(struct x25_neigh *nb)
1609 {
1610         struct sock *s;
1611         struct hlist_node *node;
1612
1613         write_lock_bh(&x25_list_lock);
1614
1615         sk_for_each(s, node, &x25_list)
1616                 if (x25_sk(s)->neighbour == nb)
1617                         x25_disconnect(s, ENETUNREACH, 0, 0);
1618
1619         write_unlock_bh(&x25_list_lock);
1620
1621         /* Remove any related forwards */
1622         x25_clear_forward_by_dev(nb->dev);
1623 }
1624
1625 static int __init x25_init(void)
1626 {
1627         int rc = proto_register(&x25_proto, 0);
1628
1629         if (rc != 0)
1630                 goto out;
1631
1632         sock_register(&x25_family_ops);
1633
1634         dev_add_pack(&x25_packet_type);
1635
1636         register_netdevice_notifier(&x25_dev_notifier);
1637
1638         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1639
1640 #ifdef CONFIG_SYSCTL
1641         x25_register_sysctl();
1642 #endif
1643         x25_proc_init();
1644 out:
1645         return rc;
1646 }
1647 module_init(x25_init);
1648
1649 static void __exit x25_exit(void)
1650 {
1651         x25_proc_exit();
1652         x25_link_free();
1653         x25_route_free();
1654
1655 #ifdef CONFIG_SYSCTL
1656         x25_unregister_sysctl();
1657 #endif
1658
1659         unregister_netdevice_notifier(&x25_dev_notifier);
1660
1661         dev_remove_pack(&x25_packet_type);
1662
1663         sock_unregister(AF_X25);
1664         proto_unregister(&x25_proto);
1665 }
1666 module_exit(x25_exit);
1667
1668 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1669 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1670 MODULE_LICENSE("GPL");
1671 MODULE_ALIAS_NETPROTO(PF_X25);