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/config.h>
  39 #include <linux/module.h>
  40 #include <linux/capability.h>
  41 #include <linux/errno.h>
  42 #include <linux/kernel.h>
  43 #include <linux/sched.h>
  44 #include <linux/timer.h>
  45 #include <linux/string.h>
  46 #include <linux/net.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/skbuff.h>
  50 #include <net/sock.h>
  51 #include <net/tcp_states.h>
  52 #include <asm/uaccess.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  55 #include <linux/notifier.h>
  56 #include <linux/init.h>
  57 #include <linux/compat.h>
  58
  59 #include <net/x25.h>
  60 #include <net/compat.h>
  61
  62 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  63 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  64 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  65 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  66 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  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 void x25_init_timers(struct sock *sk);
 489
 490 static int x25_create(struct socket *sock, int protocol)
 491 {
 492         struct sock *sk;
 493         struct x25_sock *x25;
 494         int rc = -ESOCKTNOSUPPORT;
 495
 496         if (sock->type != SOCK_SEQPACKET || protocol)
 497                 goto out;
 498
 499         rc = -ENOMEM;
 500         if ((sk = x25_alloc_socket()) == NULL)
 501                 goto out;
 502
 503         x25 = x25_sk(sk);
 504
 505         sk->sk_socket = sock;
 506         sk->sk_type = sock->type;
 507         sk->sk_sleep = &sock->wait;
 508         sock->sk = sk;
 509
 510         x25_init_timers(sk);
 511
 512         sock->ops    = &x25_proto_ops;
 513         sk->sk_protocol = protocol;
 514         sk->sk_backlog_rcv = x25_backlog_rcv;
 515
 516         x25->t21   = sysctl_x25_call_request_timeout;
 517         x25->t22   = sysctl_x25_reset_request_timeout;
 518         x25->t23   = sysctl_x25_clear_request_timeout;
 519         x25->t2    = sysctl_x25_ack_holdback_timeout;
 520         x25->state = X25_STATE_0;
 521         x25->cudmatchlength = 0;
 522         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 523                                                         /* on call accept   */
 524
 525         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 526         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 527         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 528         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 529         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 530         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 531         x25->dte_facilities.calling_len = 0;
 532         x25->dte_facilities.called_len = 0;
 533         memset(x25->dte_facilities.called_ae, '\0',
 534                         sizeof(x25->dte_facilities.called_ae));
 535         memset(x25->dte_facilities.calling_ae, '\0',
 536                         sizeof(x25->dte_facilities.calling_ae));
 537
 538         rc = 0;
 539 out:
 540         return rc;
 541 }
 542
 543 static struct sock *x25_make_new(struct sock *osk)
 544 {
 545         struct sock *sk = NULL;
 546         struct x25_sock *x25, *ox25;
 547
 548         if (osk->sk_type != SOCK_SEQPACKET)
 549                 goto out;
 550
 551         if ((sk = x25_alloc_socket()) == NULL)
 552                 goto out;
 553
 554         x25 = x25_sk(sk);
 555
 556         sk->sk_type        = osk->sk_type;
 557         sk->sk_socket      = osk->sk_socket;
 558         sk->sk_priority    = osk->sk_priority;
 559         sk->sk_protocol    = osk->sk_protocol;
 560         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 561         sk->sk_sndbuf      = osk->sk_sndbuf;
 562         sk->sk_state       = TCP_ESTABLISHED;
 563         sk->sk_sleep       = osk->sk_sleep;
 564         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 565         sock_copy_flags(sk, osk);
 566
 567         ox25 = x25_sk(osk);
 568         x25->t21        = ox25->t21;
 569         x25->t22        = ox25->t22;
 570         x25->t23        = ox25->t23;
 571         x25->t2         = ox25->t2;
 572         x25->facilities = ox25->facilities;
 573         x25->qbitincl   = ox25->qbitincl;
 574         x25->dte_facilities = ox25->dte_facilities;
 575         x25->cudmatchlength = ox25->cudmatchlength;
 576         x25->accptapprv = ox25->accptapprv;
 577
 578         x25_init_timers(sk);
 579 out:
 580         return sk;
 581 }
 582
 583 static int x25_release(struct socket *sock)
 584 {
 585         struct sock *sk = sock->sk;
 586         struct x25_sock *x25;
 587
 588         if (!sk)
 589                 goto out;
 590
 591         x25 = x25_sk(sk);
 592
 593         switch (x25->state) {
 594
 595                 case X25_STATE_0:
 596                 case X25_STATE_2:
 597                         x25_disconnect(sk, 0, 0, 0);
 598                         x25_destroy_socket(sk);
 599                         goto out;
 600
 601                 case X25_STATE_1:
 602                 case X25_STATE_3:
 603                 case X25_STATE_4:
 604                         x25_clear_queues(sk);
 605                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 606                         x25_start_t23timer(sk);
 607                         x25->state = X25_STATE_2;
 608                         sk->sk_state    = TCP_CLOSE;
 609                         sk->sk_shutdown |= SEND_SHUTDOWN;
 610                         sk->sk_state_change(sk);
 611                         sock_set_flag(sk, SOCK_DEAD);
 612                         sock_set_flag(sk, SOCK_DESTROY);
 613                         break;
 614         }
 615
 616         sock->sk        = NULL;
 617         sk->sk_socket   = NULL; /* Not used, but we should do this */
 618 out:
 619         return 0;
 620 }
 621
 622 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 623 {
 624         struct sock *sk = sock->sk;
 625         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 626
 627         if (!sock_flag(sk, SOCK_ZAPPED) ||
 628             addr_len != sizeof(struct sockaddr_x25) ||
 629             addr->sx25_family != AF_X25)
 630                 return -EINVAL;
 631
 632         x25_sk(sk)->source_addr = addr->sx25_addr;
 633         x25_insert_socket(sk);
 634         sock_reset_flag(sk, SOCK_ZAPPED);
 635         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 636
 637         return 0;
 638 }
 639
 640 static int x25_wait_for_connection_establishment(struct sock *sk)
 641 {
 642         DECLARE_WAITQUEUE(wait, current);
 643         int rc;
 644
 645         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 646         for (;;) {
 647                 __set_current_state(TASK_INTERRUPTIBLE);
 648                 rc = -ERESTARTSYS;
 649                 if (signal_pending(current))
 650                         break;
 651                 rc = sock_error(sk);
 652                 if (rc) {
 653                         sk->sk_socket->state = SS_UNCONNECTED;
 654                         break;
 655                 }
 656                 rc = 0;
 657                 if (sk->sk_state != TCP_ESTABLISHED) {
 658                         release_sock(sk);
 659                         schedule();
 660                         lock_sock(sk);
 661                 } else
 662                         break;
 663         }
 664         __set_current_state(TASK_RUNNING);
 665         remove_wait_queue(sk->sk_sleep, &wait);
 666         return rc;
 667 }
 668
 669 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 670                        int addr_len, int flags)
 671 {
 672         struct sock *sk = sock->sk;
 673         struct x25_sock *x25 = x25_sk(sk);
 674         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 675         struct x25_route *rt;
 676         int rc = 0;
 677
 678         lock_sock(sk);
 679         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 680                 sock->state = SS_CONNECTED;
 681                 goto out; /* Connect completed during a ERESTARTSYS event */
 682         }
 683
 684         rc = -ECONNREFUSED;
 685         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 686                 sock->state = SS_UNCONNECTED;
 687                 goto out;
 688         }
 689
 690         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 691         if (sk->sk_state == TCP_ESTABLISHED)
 692                 goto out;
 693
 694         sk->sk_state   = TCP_CLOSE;
 695         sock->state = SS_UNCONNECTED;
 696
 697         rc = -EINVAL;
 698         if (addr_len != sizeof(struct sockaddr_x25) ||
 699             addr->sx25_family != AF_X25)
 700                 goto out;
 701
 702         rc = -ENETUNREACH;
 703         rt = x25_get_route(&addr->sx25_addr);
 704         if (!rt)
 705                 goto out;
 706
 707         x25->neighbour = x25_get_neigh(rt->dev);
 708         if (!x25->neighbour)
 709                 goto out_put_route;
 710
 711         x25_limit_facilities(&x25->facilities, x25->neighbour);
 712
 713         x25->lci = x25_new_lci(x25->neighbour);
 714         if (!x25->lci)
 715                 goto out_put_neigh;
 716
 717         rc = -EINVAL;
 718         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 719                 goto out_put_neigh;
 720
 721         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 722                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 723
 724         x25->dest_addr = addr->sx25_addr;
 725
 726         /* Move to connecting socket, start sending Connect Requests */
 727         sock->state   = SS_CONNECTING;
 728         sk->sk_state  = TCP_SYN_SENT;
 729
 730         x25->state = X25_STATE_1;
 731
 732         x25_write_internal(sk, X25_CALL_REQUEST);
 733
 734         x25_start_heartbeat(sk);
 735         x25_start_t21timer(sk);
 736
 737         /* Now the loop */
 738         rc = -EINPROGRESS;
 739         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 740                 goto out_put_neigh;
 741
 742         rc = x25_wait_for_connection_establishment(sk);
 743         if (rc)
 744                 goto out_put_neigh;
 745
 746         sock->state = SS_CONNECTED;
 747         rc = 0;
 748 out_put_neigh:
 749         if (rc)
 750                 x25_neigh_put(x25->neighbour);
 751 out_put_route:
 752         x25_route_put(rt);
 753 out:
 754         release_sock(sk);
 755         return rc;
 756 }
 757
 758 static int x25_wait_for_data(struct sock *sk, long timeout)
 759 {
 760         DECLARE_WAITQUEUE(wait, current);
 761         int rc = 0;
 762
 763         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 764         for (;;) {
 765                 __set_current_state(TASK_INTERRUPTIBLE);
 766                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 767                         break;
 768                 rc = -ERESTARTSYS;
 769                 if (signal_pending(current))
 770                         break;
 771                 rc = -EAGAIN;
 772                 if (!timeout)
 773                         break;
 774                 rc = 0;
 775                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 776                         release_sock(sk);
 777                         timeout = schedule_timeout(timeout);
 778                         lock_sock(sk);
 779                 } else
 780                         break;
 781         }
 782         __set_current_state(TASK_RUNNING);
 783         remove_wait_queue(sk->sk_sleep, &wait);
 784         return rc;
 785 }
 786
 787 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 788 {
 789         struct sock *sk = sock->sk;
 790         struct sock *newsk;
 791         struct sk_buff *skb;
 792         int rc = -EINVAL;
 793
 794         if (!sk || sk->sk_state != TCP_LISTEN)
 795                 goto out;
 796
 797         rc = -EOPNOTSUPP;
 798         if (sk->sk_type != SOCK_SEQPACKET)
 799                 goto out;
 800
 801         lock_sock(sk);
 802         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 803         if (rc)
 804                 goto out2;
 805         skb = skb_dequeue(&sk->sk_receive_queue);
 806         rc = -EINVAL;
 807         if (!skb->sk)
 808                 goto out2;
 809         newsk            = skb->sk;
 810         newsk->sk_socket = newsock;
 811         newsk->sk_sleep  = &newsock->wait;
 812
 813         /* Now attach up the new socket */
 814         skb->sk = NULL;
 815         kfree_skb(skb);
 816         sk->sk_ack_backlog--;
 817         newsock->sk    = newsk;
 818         newsock->state = SS_CONNECTED;
 819         rc = 0;
 820 out2:
 821         release_sock(sk);
 822 out:
 823         return rc;
 824 }
 825
 826 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 827                        int *uaddr_len, int peer)
 828 {
 829         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 830         struct sock *sk = sock->sk;
 831         struct x25_sock *x25 = x25_sk(sk);
 832
 833         if (peer) {
 834                 if (sk->sk_state != TCP_ESTABLISHED)
 835                         return -ENOTCONN;
 836                 sx25->sx25_addr = x25->dest_addr;
 837         } else
 838                 sx25->sx25_addr = x25->source_addr;
 839
 840         sx25->sx25_family = AF_X25;
 841         *uaddr_len = sizeof(*sx25);
 842
 843         return 0;
 844 }
 845
 846 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 847                         unsigned int lci)
 848 {
 849         struct sock *sk;
 850         struct sock *make;
 851         struct x25_sock *makex25;
 852         struct x25_address source_addr, dest_addr;
 853         struct x25_facilities facilities;
 854         struct x25_dte_facilities dte_facilities;
 855         int len, rc;
 856
 857         /*
 858          *      Remove the LCI and frame type.
 859          */
 860         skb_pull(skb, X25_STD_MIN_LEN);
 861
 862         /*
 863          *      Extract the X.25 addresses and convert them to ASCII strings,
 864          *      and remove them.
 865          */
 866         skb_pull(skb, x25_addr_ntoa(skb->data, &source_addr, &dest_addr));
 867
 868         /*
 869          *      Get the length of the facilities, skip past them for the moment
 870          *      get the call user data because this is needed to determine
 871          *      the correct listener
 872          */
 873         len = skb->data[0] + 1;
 874         skb_pull(skb,len);
 875
 876         /*
 877          *      Find a listener for the particular address/cud pair.
 878          */
 879         sk = x25_find_listener(&source_addr,skb);
 880         skb_push(skb,len);
 881
 882         /*
 883          *      We can't accept the Call Request.
 884          */
 885         if (sk == NULL || sk_acceptq_is_full(sk))
 886                 goto out_clear_request;
 887
 888         /*
 889          *      Try to reach a compromise on the requested facilities.
 890          */
 891         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 892         if (len == -1)
 893                 goto out_sock_put;
 894
 895         /*
 896          * current neighbour/link might impose additional limits
 897          * on certain facilties
 898          */
 899
 900         x25_limit_facilities(&facilities, nb);
 901
 902         /*
 903          *      Try to create a new socket.
 904          */
 905         make = x25_make_new(sk);
 906         if (!make)
 907                 goto out_sock_put;
 908
 909         /*
 910          *      Remove the facilities
 911          */
 912         skb_pull(skb, len);
 913
 914         skb->sk     = make;
 915         make->sk_state = TCP_ESTABLISHED;
 916
 917         makex25 = x25_sk(make);
 918         makex25->lci           = lci;
 919         makex25->dest_addr     = dest_addr;
 920         makex25->source_addr   = source_addr;
 921         makex25->neighbour     = nb;
 922         makex25->facilities    = facilities;
 923         makex25->dte_facilities= dte_facilities;
 924         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 925         /* ensure no reverse facil on accept */
 926         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 927         /* ensure no calling address extension on accept */
 928         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 929         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 930
 931         /* Normally all calls are accepted immediatly */
 932         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 933                 x25_write_internal(make, X25_CALL_ACCEPTED);
 934                 makex25->state = X25_STATE_3;
 935         }
 936
 937         /*
 938          *      Incoming Call User Data.
 939          */
 940         if (skb->len >= 0) {
 941                 memcpy(makex25->calluserdata.cuddata, skb->data, skb->len);
 942                 makex25->calluserdata.cudlength = skb->len;
 943         }
 944
 945         sk->sk_ack_backlog++;
 946
 947         x25_insert_socket(make);
 948
 949         skb_queue_head(&sk->sk_receive_queue, skb);
 950
 951         x25_start_heartbeat(make);
 952
 953         if (!sock_flag(sk, SOCK_DEAD))
 954                 sk->sk_data_ready(sk, skb->len);
 955         rc = 1;
 956         sock_put(sk);
 957 out:
 958         return rc;
 959 out_sock_put:
 960         sock_put(sk);
 961 out_clear_request:
 962         rc = 0;
 963         x25_transmit_clear_request(nb, lci, 0x01);
 964         goto out;
 965 }
 966
 967 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 968                        struct msghdr *msg, size_t len)
 969 {
 970         struct sock *sk = sock->sk;
 971         struct x25_sock *x25 = x25_sk(sk);
 972         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 973         struct sockaddr_x25 sx25;
 974         struct sk_buff *skb;
 975         unsigned char *asmptr;
 976         int noblock = msg->msg_flags & MSG_DONTWAIT;
 977         size_t size;
 978         int qbit = 0, rc = -EINVAL;
 979
 980         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 981                 goto out;
 982
 983         /* we currently don't support segmented records at the user interface */
 984         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 985                 goto out;
 986
 987         rc = -EADDRNOTAVAIL;
 988         if (sock_flag(sk, SOCK_ZAPPED))
 989                 goto out;
 990
 991         rc = -EPIPE;
 992         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 993                 send_sig(SIGPIPE, current, 0);
 994                 goto out;
 995         }
 996
 997         rc = -ENETUNREACH;
 998         if (!x25->neighbour)
 999                 goto out;
1000
1001         if (usx25) {
1002                 rc = -EINVAL;
1003                 if (msg->msg_namelen < sizeof(sx25))
1004                         goto out;
1005                 memcpy(&sx25, usx25, sizeof(sx25));
1006                 rc = -EISCONN;
1007                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1008                         goto out;
1009                 rc = -EINVAL;
1010                 if (sx25.sx25_family != AF_X25)
1011                         goto out;
1012         } else {
1013                 /*
1014                  *      FIXME 1003.1g - if the socket is like this because
1015                  *      it has become closed (not started closed) we ought
1016                  *      to SIGPIPE, EPIPE;
1017                  */
1018                 rc = -ENOTCONN;
1019                 if (sk->sk_state != TCP_ESTABLISHED)
1020                         goto out;
1021
1022                 sx25.sx25_family = AF_X25;
1023                 sx25.sx25_addr   = x25->dest_addr;
1024         }
1025
1026         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1027
1028         /* Build a packet */
1029         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1030
1031         if ((msg->msg_flags & MSG_OOB) && len > 32)
1032                 len = 32;
1033
1034         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1035
1036         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1037         if (!skb)
1038                 goto out;
1039         X25_SKB_CB(skb)->flags = msg->msg_flags;
1040
1041         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1042
1043         /*
1044          *      Put the data on the end
1045          */
1046         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1047
1048         asmptr = skb->h.raw = skb_put(skb, len);
1049
1050         rc = memcpy_fromiovec(asmptr, msg->msg_iov, len);
1051         if (rc)
1052                 goto out_kfree_skb;
1053
1054         /*
1055          *      If the Q BIT Include socket option is in force, the first
1056          *      byte of the user data is the logical value of the Q Bit.
1057          */
1058         if (x25->qbitincl) {
1059                 qbit = skb->data[0];
1060                 skb_pull(skb, 1);
1061         }
1062
1063         /*
1064          *      Push down the X.25 header
1065          */
1066         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1067
1068         if (msg->msg_flags & MSG_OOB) {
1069                 if (x25->neighbour->extended) {
1070                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1071                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1072                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1073                         *asmptr++ = X25_INTERRUPT;
1074                 } else {
1075                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1076                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1077                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1078                         *asmptr++ = X25_INTERRUPT;
1079                 }
1080         } else {
1081                 if (x25->neighbour->extended) {
1082                         /* Build an Extended X.25 header */
1083                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1084                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1085                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1086                         *asmptr++ = X25_DATA;
1087                         *asmptr++ = X25_DATA;
1088                 } else {
1089                         /* Build an Standard X.25 header */
1090                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1091                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1092                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1093                         *asmptr++ = X25_DATA;
1094                 }
1095
1096                 if (qbit)
1097                         skb->data[0] |= X25_Q_BIT;
1098         }
1099
1100         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1101         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1102
1103         rc = -ENOTCONN;
1104         if (sk->sk_state != TCP_ESTABLISHED)
1105                 goto out_kfree_skb;
1106
1107         if (msg->msg_flags & MSG_OOB)
1108                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1109         else {
1110                 len = x25_output(sk, skb);
1111                 if (len < 0)
1112                         kfree_skb(skb);
1113                 else if (x25->qbitincl)
1114                         len++;
1115         }
1116
1117         /*
1118          * lock_sock() is currently only used to serialize this x25_kick()
1119          * against input-driven x25_kick() calls. It currently only blocks
1120          * incoming packets for this socket and does not protect against
1121          * any other socket state changes and is not called from anywhere
1122          * else. As x25_kick() cannot block and as long as all socket
1123          * operations are BKL-wrapped, we don't need take to care about
1124          * purging the backlog queue in x25_release().
1125          *
1126          * Using lock_sock() to protect all socket operations entirely
1127          * (and making the whole x25 stack SMP aware) unfortunately would
1128          * require major changes to {send,recv}msg and skb allocation methods.
1129          * -> 2.5 ;)
1130          */
1131         lock_sock(sk);
1132         x25_kick(sk);
1133         release_sock(sk);
1134         rc = len;
1135 out:
1136         return rc;
1137 out_kfree_skb:
1138         kfree_skb(skb);
1139         goto out;
1140 }
1141
1142
1143 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1144                        struct msghdr *msg, size_t size,
1145                        int flags)
1146 {
1147         struct sock *sk = sock->sk;
1148         struct x25_sock *x25 = x25_sk(sk);
1149         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1150         size_t copied;
1151         int qbit;
1152         struct sk_buff *skb;
1153         unsigned char *asmptr;
1154         int rc = -ENOTCONN;
1155
1156         /*
1157          * This works for seqpacket too. The receiver has ordered the queue for
1158          * us! We do one quick check first though
1159          */
1160         if (sk->sk_state != TCP_ESTABLISHED)
1161                 goto out;
1162
1163         if (flags & MSG_OOB) {
1164                 rc = -EINVAL;
1165                 if (sock_flag(sk, SOCK_URGINLINE) ||
1166                     !skb_peek(&x25->interrupt_in_queue))
1167                         goto out;
1168
1169                 skb = skb_dequeue(&x25->interrupt_in_queue);
1170
1171                 skb_pull(skb, X25_STD_MIN_LEN);
1172
1173                 /*
1174                  *      No Q bit information on Interrupt data.
1175                  */
1176                 if (x25->qbitincl) {
1177                         asmptr  = skb_push(skb, 1);
1178                         *asmptr = 0x00;
1179                 }
1180
1181                 msg->msg_flags |= MSG_OOB;
1182         } else {
1183                 /* Now we can treat all alike */
1184                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1185                                         flags & MSG_DONTWAIT, &rc);
1186                 if (!skb)
1187                         goto out;
1188
1189                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1190
1191                 skb_pull(skb, x25->neighbour->extended ?
1192                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1193
1194                 if (x25->qbitincl) {
1195                         asmptr  = skb_push(skb, 1);
1196                         *asmptr = qbit;
1197                 }
1198         }
1199
1200         skb->h.raw = skb->data;
1201
1202         copied = skb->len;
1203
1204         if (copied > size) {
1205                 copied = size;
1206                 msg->msg_flags |= MSG_TRUNC;
1207         }
1208
1209         /* Currently, each datagram always contains a complete record */
1210         msg->msg_flags |= MSG_EOR;
1211
1212         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1213         if (rc)
1214                 goto out_free_dgram;
1215
1216         if (sx25) {
1217                 sx25->sx25_family = AF_X25;
1218                 sx25->sx25_addr   = x25->dest_addr;
1219         }
1220
1221         msg->msg_namelen = sizeof(struct sockaddr_x25);
1222
1223         lock_sock(sk);
1224         x25_check_rbuf(sk);
1225         release_sock(sk);
1226         rc = copied;
1227 out_free_dgram:
1228         skb_free_datagram(sk, skb);
1229 out:
1230         return rc;
1231 }
1232
1233
1234 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1235 {
1236         struct sock *sk = sock->sk;
1237         struct x25_sock *x25 = x25_sk(sk);
1238         void __user *argp = (void __user *)arg;
1239         int rc;
1240
1241         switch (cmd) {
1242                 case TIOCOUTQ: {
1243                         int amount = sk->sk_sndbuf -
1244                                      atomic_read(&sk->sk_wmem_alloc);
1245                         if (amount < 0)
1246                                 amount = 0;
1247                         rc = put_user(amount, (unsigned int __user *)argp);
1248                         break;
1249                 }
1250
1251                 case TIOCINQ: {
1252                         struct sk_buff *skb;
1253                         int amount = 0;
1254                         /*
1255                          * These two are safe on a single CPU system as
1256                          * only user tasks fiddle here
1257                          */
1258                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1259                                 amount = skb->len;
1260                         rc = put_user(amount, (unsigned int __user *)argp);
1261                         break;
1262                 }
1263
1264                 case SIOCGSTAMP:
1265                         rc = -EINVAL;
1266                         if (sk)
1267                                 rc = sock_get_timestamp(sk,
1268                                                 (struct timeval __user *)argp);
1269                         break;
1270                 case SIOCGIFADDR:
1271                 case SIOCSIFADDR:
1272                 case SIOCGIFDSTADDR:
1273                 case SIOCSIFDSTADDR:
1274                 case SIOCGIFBRDADDR:
1275                 case SIOCSIFBRDADDR:
1276                 case SIOCGIFNETMASK:
1277                 case SIOCSIFNETMASK:
1278                 case SIOCGIFMETRIC:
1279                 case SIOCSIFMETRIC:
1280                         rc = -EINVAL;
1281                         break;
1282                 case SIOCADDRT:
1283                 case SIOCDELRT:
1284                         rc = -EPERM;
1285                         if (!capable(CAP_NET_ADMIN))
1286                                 break;
1287                         rc = x25_route_ioctl(cmd, argp);
1288                         break;
1289                 case SIOCX25GSUBSCRIP:
1290                         rc = x25_subscr_ioctl(cmd, argp);
1291                         break;
1292                 case SIOCX25SSUBSCRIP:
1293                         rc = -EPERM;
1294                         if (!capable(CAP_NET_ADMIN))
1295                                 break;
1296                         rc = x25_subscr_ioctl(cmd, argp);
1297                         break;
1298                 case SIOCX25GFACILITIES: {
1299                         struct x25_facilities fac = x25->facilities;
1300                         rc = copy_to_user(argp, &fac,
1301                                           sizeof(fac)) ? -EFAULT : 0;
1302                         break;
1303                 }
1304
1305                 case SIOCX25SFACILITIES: {
1306                         struct x25_facilities facilities;
1307                         rc = -EFAULT;
1308                         if (copy_from_user(&facilities, argp,
1309                                            sizeof(facilities)))
1310                                 break;
1311                         rc = -EINVAL;
1312                         if (sk->sk_state != TCP_LISTEN &&
1313                             sk->sk_state != TCP_CLOSE)
1314                                 break;
1315                         if (facilities.pacsize_in < X25_PS16 ||
1316                             facilities.pacsize_in > X25_PS4096)
1317                                 break;
1318                         if (facilities.pacsize_out < X25_PS16 ||
1319                             facilities.pacsize_out > X25_PS4096)
1320                                 break;
1321                         if (facilities.winsize_in < 1 ||
1322                             facilities.winsize_in > 127)
1323                                 break;
1324                         if (facilities.throughput < 0x03 ||
1325                             facilities.throughput > 0xDD)
1326                                 break;
1327                         if (facilities.reverse &&
1328                                 (facilities.reverse | 0x81)!= 0x81)
1329                                 break;
1330                         x25->facilities = facilities;
1331                         rc = 0;
1332                         break;
1333                 }
1334
1335                 case SIOCX25GDTEFACILITIES: {
1336                         rc = copy_to_user(argp, &x25->dte_facilities,
1337                                                 sizeof(x25->dte_facilities));
1338                         if (rc)
1339                                 rc = -EFAULT;
1340                         break;
1341                 }
1342
1343                 case SIOCX25SDTEFACILITIES: {
1344                         struct x25_dte_facilities dtefacs;
1345                         rc = -EFAULT;
1346                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1347                                 break;
1348                         rc = -EINVAL;
1349                         if (sk->sk_state != TCP_LISTEN &&
1350                                         sk->sk_state != TCP_CLOSE)
1351                                 break;
1352                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1353                                 break;
1354                         if (dtefacs.calling_ae == NULL)
1355                                 break;
1356                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1357                                 break;
1358                         if (dtefacs.called_ae == NULL)
1359                                 break;
1360                         x25->dte_facilities = dtefacs;
1361                         rc = 0;
1362                         break;
1363                 }
1364
1365                 case SIOCX25GCALLUSERDATA: {
1366                         struct x25_calluserdata cud = x25->calluserdata;
1367                         rc = copy_to_user(argp, &cud,
1368                                           sizeof(cud)) ? -EFAULT : 0;
1369                         break;
1370                 }
1371
1372                 case SIOCX25SCALLUSERDATA: {
1373                         struct x25_calluserdata calluserdata;
1374
1375                         rc = -EFAULT;
1376                         if (copy_from_user(&calluserdata, argp,
1377                                            sizeof(calluserdata)))
1378                                 break;
1379                         rc = -EINVAL;
1380                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1381                                 break;
1382                         x25->calluserdata = calluserdata;
1383                         rc = 0;
1384                         break;
1385                 }
1386
1387                 case SIOCX25GCAUSEDIAG: {
1388                         struct x25_causediag causediag;
1389                         causediag = x25->causediag;
1390                         rc = copy_to_user(argp, &causediag,
1391                                           sizeof(causediag)) ? -EFAULT : 0;
1392                         break;
1393                 }
1394
1395                 case SIOCX25SCUDMATCHLEN: {
1396                         struct x25_subaddr sub_addr;
1397                         rc = -EINVAL;
1398                         if(sk->sk_state != TCP_CLOSE)
1399                                 break;
1400                         rc = -EFAULT;
1401                         if (copy_from_user(&sub_addr, argp,
1402                                         sizeof(sub_addr)))
1403                                 break;
1404                         rc = -EINVAL;
1405                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1406                                 break;
1407                         x25->cudmatchlength = sub_addr.cudmatchlength;
1408                         rc = 0;
1409                         break;
1410                 }
1411
1412                 case SIOCX25CALLACCPTAPPRV: {
1413                         rc = -EINVAL;
1414                         if (sk->sk_state != TCP_CLOSE)
1415                                 break;
1416                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1417                         rc = 0;
1418                         break;
1419                 }
1420
1421                 case SIOCX25SENDCALLACCPT:  {
1422                         rc = -EINVAL;
1423                         if (sk->sk_state != TCP_ESTABLISHED)
1424                                 break;
1425                         if (x25->accptapprv)    /* must call accptapprv above */
1426                                 break;
1427                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1428                         x25->state = X25_STATE_3;
1429                         rc = 0;
1430                         break;
1431                 }
1432
1433                 default:
1434                         rc = -ENOIOCTLCMD;
1435                         break;
1436         }
1437
1438         return rc;
1439 }
1440
1441 static struct net_proto_family x25_family_ops = {
1442         .family =       AF_X25,
1443         .create =       x25_create,
1444         .owner  =       THIS_MODULE,
1445 };
1446
1447 #ifdef CONFIG_COMPAT
1448 static int compat_x25_subscr_ioctl(unsigned int cmd,
1449                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1450 {
1451         struct compat_x25_subscrip_struct x25_subscr;
1452         struct x25_neigh *nb;
1453         struct net_device *dev;
1454         int rc = -EINVAL;
1455
1456         rc = -EFAULT;
1457         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1458                 goto out;
1459
1460         rc = -EINVAL;
1461         dev = x25_dev_get(x25_subscr.device);
1462         if (dev == NULL)
1463                 goto out;
1464
1465         nb = x25_get_neigh(dev);
1466         if (nb == NULL)
1467                 goto out_dev_put;
1468
1469         dev_put(dev);
1470
1471         if (cmd == SIOCX25GSUBSCRIP) {
1472                 x25_subscr.extended = nb->extended;
1473                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1474                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1475                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1476         } else {
1477                 rc = -EINVAL;
1478                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1479                         rc = 0;
1480                         nb->extended = x25_subscr.extended;
1481                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1482                 }
1483         }
1484         x25_neigh_put(nb);
1485 out:
1486         return rc;
1487 out_dev_put:
1488         dev_put(dev);
1489         goto out;
1490 }
1491
1492 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1493                                 unsigned long arg)
1494 {
1495         void __user *argp = compat_ptr(arg);
1496         struct sock *sk = sock->sk;
1497
1498         int rc = -ENOIOCTLCMD;
1499
1500         switch(cmd) {
1501         case TIOCOUTQ:
1502         case TIOCINQ:
1503                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1504                 break;
1505         case SIOCGSTAMP:
1506                 rc = -EINVAL;
1507                 if (sk)
1508                         rc = compat_sock_get_timestamp(sk,
1509                                         (struct timeval __user*)argp);
1510                 break;
1511         case SIOCGIFADDR:
1512         case SIOCSIFADDR:
1513         case SIOCGIFDSTADDR:
1514         case SIOCSIFDSTADDR:
1515         case SIOCGIFBRDADDR:
1516         case SIOCSIFBRDADDR:
1517         case SIOCGIFNETMASK:
1518         case SIOCSIFNETMASK:
1519         case SIOCGIFMETRIC:
1520         case SIOCSIFMETRIC:
1521                 rc = -EINVAL;
1522                 break;
1523         case SIOCADDRT:
1524         case SIOCDELRT:
1525                 rc = -EPERM;
1526                 if (!capable(CAP_NET_ADMIN))
1527                         break;
1528                 rc = x25_route_ioctl(cmd, argp);
1529                 break;
1530         case SIOCX25GSUBSCRIP:
1531                 rc = compat_x25_subscr_ioctl(cmd, argp);
1532                 break;
1533         case SIOCX25SSUBSCRIP:
1534                 rc = -EPERM;
1535                 if (!capable(CAP_NET_ADMIN))
1536                         break;
1537                 rc = compat_x25_subscr_ioctl(cmd, argp);
1538                 break;
1539         case SIOCX25GFACILITIES:
1540         case SIOCX25SFACILITIES:
1541         case SIOCX25GDTEFACILITIES:
1542         case SIOCX25SDTEFACILITIES:
1543         case SIOCX25GCALLUSERDATA:
1544         case SIOCX25SCALLUSERDATA:
1545         case SIOCX25GCAUSEDIAG:
1546         case SIOCX25SCUDMATCHLEN:
1547         case SIOCX25CALLACCPTAPPRV:
1548         case SIOCX25SENDCALLACCPT:
1549                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1550                 break;
1551         default:
1552                 rc = -ENOIOCTLCMD;
1553                 break;
1554         }
1555         return rc;
1556 }
1557 #endif
1558
1559 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1560         .family =       AF_X25,
1561         .owner =        THIS_MODULE,
1562         .release =      x25_release,
1563         .bind =         x25_bind,
1564         .connect =      x25_connect,
1565         .socketpair =   sock_no_socketpair,
1566         .accept =       x25_accept,
1567         .getname =      x25_getname,
1568         .poll =         datagram_poll,
1569         .ioctl =        x25_ioctl,
1570 #ifdef CONFIG_COMPAT
1571         .compat_ioctl = compat_x25_ioctl,
1572 #endif
1573         .listen =       x25_listen,
1574         .shutdown =     sock_no_shutdown,
1575         .setsockopt =   x25_setsockopt,
1576         .getsockopt =   x25_getsockopt,
1577         .sendmsg =      x25_sendmsg,
1578         .recvmsg =      x25_recvmsg,
1579         .mmap =         sock_no_mmap,
1580         .sendpage =     sock_no_sendpage,
1581 };
1582
1583 #include <linux/smp_lock.h>
1584 SOCKOPS_WRAP(x25_proto, AF_X25);
1585
1586 static struct packet_type x25_packet_type = {
1587         .type = __constant_htons(ETH_P_X25),
1588         .func = x25_lapb_receive_frame,
1589 };
1590
1591 static struct notifier_block x25_dev_notifier = {
1592         .notifier_call = x25_device_event,
1593 };
1594
1595 void x25_kill_by_neigh(struct x25_neigh *nb)
1596 {
1597         struct sock *s;
1598         struct hlist_node *node;
1599
1600         write_lock_bh(&x25_list_lock);
1601
1602         sk_for_each(s, node, &x25_list)
1603                 if (x25_sk(s)->neighbour == nb)
1604                         x25_disconnect(s, ENETUNREACH, 0, 0);
1605
1606         write_unlock_bh(&x25_list_lock);
1607 }
1608
1609 static int __init x25_init(void)
1610 {
1611         int rc = proto_register(&x25_proto, 0);
1612
1613         if (rc != 0)
1614                 goto out;
1615
1616         sock_register(&x25_family_ops);
1617
1618         dev_add_pack(&x25_packet_type);
1619
1620         register_netdevice_notifier(&x25_dev_notifier);
1621
1622         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1623
1624 #ifdef CONFIG_SYSCTL
1625         x25_register_sysctl();
1626 #endif
1627         x25_proc_init();
1628 out:
1629         return rc;
1630 }
1631 module_init(x25_init);
1632
1633 static void __exit x25_exit(void)
1634 {
1635         x25_proc_exit();
1636         x25_link_free();
1637         x25_route_free();
1638
1639 #ifdef CONFIG_SYSCTL
1640         x25_unregister_sysctl();
1641 #endif
1642
1643         unregister_netdevice_notifier(&x25_dev_notifier);
1644
1645         dev_remove_pack(&x25_packet_type);
1646
1647         sock_unregister(AF_X25);
1648         proto_unregister(&x25_proto);
1649 }
1650 module_exit(x25_exit);
1651
1652 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1653 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1654 MODULE_LICENSE("GPL");
1655 MODULE_ALIAS_NETPROTO(PF_X25);