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

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/capability.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/timer.h>
  44 #include <linux/string.h>
  45 #include <linux/net.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <net/sock.h>
  50 #include <net/tcp_states.h>
  51 #include <asm/uaccess.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  54 #include <linux/notifier.h>
  55 #include <linux/init.h>
  56 #include <linux/compat.h>
  57
  58 #include <net/x25.h>
  59 #include <net/compat.h>
  60
  61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  62 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  63 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  64 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  65 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  66 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         unsigned int called_len, calling_len;
  87         char *called, *calling;
  88         unsigned 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 (!net_eq(dev_net(dev), &init_net))
 195                 return NOTIFY_DONE;
 196
 197         if (dev->type == ARPHRD_X25
 198 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 199          || dev->type == ARPHRD_ETHER
 200 #endif
 201          ) {
 202                 switch (event) {
 203                         case NETDEV_UP:
 204                                 x25_link_device_up(dev);
 205                                 break;
 206                         case NETDEV_GOING_DOWN:
 207                                 nb = x25_get_neigh(dev);
 208                                 if (nb) {
 209                                         x25_terminate_link(nb);
 210                                         x25_neigh_put(nb);
 211                                 }
 212                                 break;
 213                         case NETDEV_DOWN:
 214                                 x25_kill_by_device(dev);
 215                                 x25_route_device_down(dev);
 216                                 x25_link_device_down(dev);
 217                                 break;
 218                 }
 219         }
 220
 221         return NOTIFY_DONE;
 222 }
 223
 224 /*
 225  *      Add a socket to the bound sockets list.
 226  */
 227 static void x25_insert_socket(struct sock *sk)
 228 {
 229         write_lock_bh(&x25_list_lock);
 230         sk_add_node(sk, &x25_list);
 231         write_unlock_bh(&x25_list_lock);
 232 }
 233
 234 /*
 235  *      Find a socket that wants to accept the Call Request we just
 236  *      received. Check the full list for an address/cud match.
 237  *      If no cuds match return the next_best thing, an address match.
 238  *      Note: if a listening socket has cud set it must only get calls
 239  *      with matching cud.
 240  */
 241 static struct sock *x25_find_listener(struct x25_address *addr,
 242                                         struct sk_buff *skb)
 243 {
 244         struct sock *s;
 245         struct sock *next_best;
 246         struct hlist_node *node;
 247
 248         read_lock_bh(&x25_list_lock);
 249         next_best = NULL;
 250
 251         sk_for_each(s, node, &x25_list)
 252                 if ((!strcmp(addr->x25_addr,
 253                         x25_sk(s)->source_addr.x25_addr) ||
 254                                 !strcmp(addr->x25_addr,
 255                                         null_x25_address.x25_addr)) &&
 256                                         s->sk_state == TCP_LISTEN) {
 257                         /*
 258                          * Found a listening socket, now check the incoming
 259                          * call user data vs this sockets call user data
 260                          */
 261                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 262                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 263                                         skb->data,
 264                                         x25_sk(s)->cudmatchlength)) == 0) {
 265                                         sock_hold(s);
 266                                         goto found;
 267                                  }
 268                         } else
 269                                 next_best = s;
 270                 }
 271         if (next_best) {
 272                 s = next_best;
 273                 sock_hold(s);
 274                 goto found;
 275         }
 276         s = NULL;
 277 found:
 278         read_unlock_bh(&x25_list_lock);
 279         return s;
 280 }
 281
 282 /*
 283  *      Find a connected X.25 socket given my LCI and neighbour.
 284  */
 285 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 286 {
 287         struct sock *s;
 288         struct hlist_node *node;
 289
 290         sk_for_each(s, node, &x25_list)
 291                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 292                         sock_hold(s);
 293                         goto found;
 294                 }
 295         s = NULL;
 296 found:
 297         return s;
 298 }
 299
 300 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 301 {
 302         struct sock *s;
 303
 304         read_lock_bh(&x25_list_lock);
 305         s = __x25_find_socket(lci, nb);
 306         read_unlock_bh(&x25_list_lock);
 307         return s;
 308 }
 309
 310 /*
 311  *      Find a unique LCI for a given device.
 312  */
 313 static unsigned int x25_new_lci(struct x25_neigh *nb)
 314 {
 315         unsigned int lci = 1;
 316         struct sock *sk;
 317
 318         read_lock_bh(&x25_list_lock);
 319
 320         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 321                 sock_put(sk);
 322                 if (++lci == 4096) {
 323                         lci = 0;
 324                         break;
 325                 }
 326         }
 327
 328         read_unlock_bh(&x25_list_lock);
 329         return lci;
 330 }
 331
 332 /*
 333  *      Deferred destroy.
 334  */
 335 static void __x25_destroy_socket(struct sock *);
 336
 337 /*
 338  *      handler for deferred kills.
 339  */
 340 static void x25_destroy_timer(unsigned long data)
 341 {
 342         x25_destroy_socket_from_timer((struct sock *)data);
 343 }
 344
 345 /*
 346  *      This is called from user mode and the timers. Thus it protects itself
 347  *      against interrupt users but doesn't worry about being called during
 348  *      work. Once it is removed from the queue no interrupt or bottom half
 349  *      will touch it and we are (fairly 8-) ) safe.
 350  *      Not static as it's used by the timer
 351  */
 352 static void __x25_destroy_socket(struct sock *sk)
 353 {
 354         struct sk_buff *skb;
 355
 356         x25_stop_heartbeat(sk);
 357         x25_stop_timer(sk);
 358
 359         x25_remove_socket(sk);
 360         x25_clear_queues(sk);           /* Flush the queues */
 361
 362         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 363                 if (skb->sk != sk) {            /* A pending connection */
 364                         /*
 365                          * Queue the unaccepted socket for death
 366                          */
 367                         sock_set_flag(skb->sk, SOCK_DEAD);
 368                         x25_start_heartbeat(skb->sk);
 369                         x25_sk(skb->sk)->state = X25_STATE_0;
 370                 }
 371
 372                 kfree_skb(skb);
 373         }
 374
 375         if (sk_has_allocations(sk)) {
 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
 387 void x25_destroy_socket_from_timer(struct sock *sk)
 388 {
 389         sock_hold(sk);
 390         bh_lock_sock(sk);
 391         __x25_destroy_socket(sk);
 392         bh_unlock_sock(sk);
 393         sock_put(sk);
 394 }
 395
 396 static void x25_destroy_socket(struct sock *sk)
 397 {
 398         sock_hold(sk);
 399         lock_sock(sk);
 400         __x25_destroy_socket(sk);
 401         release_sock(sk);
 402         sock_put(sk);
 403 }
 404
 405 /*
 406  *      Handling for system calls applied via the various interfaces to a
 407  *      X.25 socket object.
 408  */
 409
 410 static int x25_setsockopt(struct socket *sock, int level, int optname,
 411                           char __user *optval, int optlen)
 412 {
 413         int opt;
 414         struct sock *sk = sock->sk;
 415         int rc = -ENOPROTOOPT;
 416
 417         if (level != SOL_X25 || optname != X25_QBITINCL)
 418                 goto out;
 419
 420         rc = -EINVAL;
 421         if (optlen < sizeof(int))
 422                 goto out;
 423
 424         rc = -EFAULT;
 425         if (get_user(opt, (int __user *)optval))
 426                 goto out;
 427
 428         x25_sk(sk)->qbitincl = !!opt;
 429         rc = 0;
 430 out:
 431         return rc;
 432 }
 433
 434 static int x25_getsockopt(struct socket *sock, int level, int optname,
 435                           char __user *optval, int __user *optlen)
 436 {
 437         struct sock *sk = sock->sk;
 438         int val, len, rc = -ENOPROTOOPT;
 439
 440         if (level != SOL_X25 || optname != X25_QBITINCL)
 441                 goto out;
 442
 443         rc = -EFAULT;
 444         if (get_user(len, optlen))
 445                 goto out;
 446
 447         len = min_t(unsigned int, len, sizeof(int));
 448
 449         rc = -EINVAL;
 450         if (len < 0)
 451                 goto out;
 452
 453         rc = -EFAULT;
 454         if (put_user(len, optlen))
 455                 goto out;
 456
 457         val = x25_sk(sk)->qbitincl;
 458         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 459 out:
 460         return rc;
 461 }
 462
 463 static int x25_listen(struct socket *sock, int backlog)
 464 {
 465         struct sock *sk = sock->sk;
 466         int rc = -EOPNOTSUPP;
 467
 468         if (sk->sk_state != TCP_LISTEN) {
 469                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 470                 sk->sk_max_ack_backlog = backlog;
 471                 sk->sk_state           = TCP_LISTEN;
 472                 rc = 0;
 473         }
 474
 475         return rc;
 476 }
 477
 478 static struct proto x25_proto = {
 479         .name     = "X25",
 480         .owner    = THIS_MODULE,
 481         .obj_size = sizeof(struct x25_sock),
 482 };
 483
 484 static struct sock *x25_alloc_socket(struct net *net)
 485 {
 486         struct x25_sock *x25;
 487         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 488
 489         if (!sk)
 490                 goto out;
 491
 492         sock_init_data(NULL, sk);
 493
 494         x25 = x25_sk(sk);
 495         skb_queue_head_init(&x25->ack_queue);
 496         skb_queue_head_init(&x25->fragment_queue);
 497         skb_queue_head_init(&x25->interrupt_in_queue);
 498         skb_queue_head_init(&x25->interrupt_out_queue);
 499 out:
 500         return sk;
 501 }
 502
 503 static int x25_create(struct net *net, struct socket *sock, int protocol)
 504 {
 505         struct sock *sk;
 506         struct x25_sock *x25;
 507         int rc = -ESOCKTNOSUPPORT;
 508
 509         if (net != &init_net)
 510                 return -EAFNOSUPPORT;
 511
 512         if (sock->type != SOCK_SEQPACKET || protocol)
 513                 goto out;
 514
 515         rc = -ENOMEM;
 516         if ((sk = x25_alloc_socket(net)) == NULL)
 517                 goto out;
 518
 519         x25 = x25_sk(sk);
 520
 521         sock_init_data(sock, sk);
 522
 523         x25_init_timers(sk);
 524
 525         sock->ops    = &x25_proto_ops;
 526         sk->sk_protocol = protocol;
 527         sk->sk_backlog_rcv = x25_backlog_rcv;
 528
 529         x25->t21   = sysctl_x25_call_request_timeout;
 530         x25->t22   = sysctl_x25_reset_request_timeout;
 531         x25->t23   = sysctl_x25_clear_request_timeout;
 532         x25->t2    = sysctl_x25_ack_holdback_timeout;
 533         x25->state = X25_STATE_0;
 534         x25->cudmatchlength = 0;
 535         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 536                                                         /* on call accept   */
 537
 538         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 539         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 540         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 541         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 542         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 543         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 544         x25->dte_facilities.calling_len = 0;
 545         x25->dte_facilities.called_len = 0;
 546         memset(x25->dte_facilities.called_ae, '\0',
 547                         sizeof(x25->dte_facilities.called_ae));
 548         memset(x25->dte_facilities.calling_ae, '\0',
 549                         sizeof(x25->dte_facilities.calling_ae));
 550
 551         rc = 0;
 552 out:
 553         return rc;
 554 }
 555
 556 static struct sock *x25_make_new(struct sock *osk)
 557 {
 558         struct sock *sk = NULL;
 559         struct x25_sock *x25, *ox25;
 560
 561         if (osk->sk_type != SOCK_SEQPACKET)
 562                 goto out;
 563
 564         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 565                 goto out;
 566
 567         x25 = x25_sk(sk);
 568
 569         sk->sk_type        = osk->sk_type;
 570         sk->sk_priority    = osk->sk_priority;
 571         sk->sk_protocol    = osk->sk_protocol;
 572         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 573         sk->sk_sndbuf      = osk->sk_sndbuf;
 574         sk->sk_state       = TCP_ESTABLISHED;
 575         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 576         sock_copy_flags(sk, osk);
 577
 578         ox25 = x25_sk(osk);
 579         x25->t21        = ox25->t21;
 580         x25->t22        = ox25->t22;
 581         x25->t23        = ox25->t23;
 582         x25->t2         = ox25->t2;
 583         x25->facilities = ox25->facilities;
 584         x25->qbitincl   = ox25->qbitincl;
 585         x25->dte_facilities = ox25->dte_facilities;
 586         x25->cudmatchlength = ox25->cudmatchlength;
 587         x25->accptapprv = ox25->accptapprv;
 588
 589         x25_init_timers(sk);
 590 out:
 591         return sk;
 592 }
 593
 594 static int x25_release(struct socket *sock)
 595 {
 596         struct sock *sk = sock->sk;
 597         struct x25_sock *x25;
 598
 599         if (!sk)
 600                 goto out;
 601
 602         x25 = x25_sk(sk);
 603
 604         switch (x25->state) {
 605
 606                 case X25_STATE_0:
 607                 case X25_STATE_2:
 608                         x25_disconnect(sk, 0, 0, 0);
 609                         x25_destroy_socket(sk);
 610                         goto out;
 611
 612                 case X25_STATE_1:
 613                 case X25_STATE_3:
 614                 case X25_STATE_4:
 615                         x25_clear_queues(sk);
 616                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 617                         x25_start_t23timer(sk);
 618                         x25->state = X25_STATE_2;
 619                         sk->sk_state    = TCP_CLOSE;
 620                         sk->sk_shutdown |= SEND_SHUTDOWN;
 621                         sk->sk_state_change(sk);
 622                         sock_set_flag(sk, SOCK_DEAD);
 623                         sock_set_flag(sk, SOCK_DESTROY);
 624                         break;
 625         }
 626
 627         sock_orphan(sk);
 628 out:
 629         return 0;
 630 }
 631
 632 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 633 {
 634         struct sock *sk = sock->sk;
 635         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 636
 637         if (!sock_flag(sk, SOCK_ZAPPED) ||
 638             addr_len != sizeof(struct sockaddr_x25) ||
 639             addr->sx25_family != AF_X25)
 640                 return -EINVAL;
 641
 642         x25_sk(sk)->source_addr = addr->sx25_addr;
 643         x25_insert_socket(sk);
 644         sock_reset_flag(sk, SOCK_ZAPPED);
 645         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 646
 647         return 0;
 648 }
 649
 650 static int x25_wait_for_connection_establishment(struct sock *sk)
 651 {
 652         DECLARE_WAITQUEUE(wait, current);
 653         int rc;
 654
 655         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 656         for (;;) {
 657                 __set_current_state(TASK_INTERRUPTIBLE);
 658                 rc = -ERESTARTSYS;
 659                 if (signal_pending(current))
 660                         break;
 661                 rc = sock_error(sk);
 662                 if (rc) {
 663                         sk->sk_socket->state = SS_UNCONNECTED;
 664                         break;
 665                 }
 666                 rc = 0;
 667                 if (sk->sk_state != TCP_ESTABLISHED) {
 668                         release_sock(sk);
 669                         schedule();
 670                         lock_sock(sk);
 671                 } else
 672                         break;
 673         }
 674         __set_current_state(TASK_RUNNING);
 675         remove_wait_queue(sk->sk_sleep, &wait);
 676         return rc;
 677 }
 678
 679 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 680                        int addr_len, int flags)
 681 {
 682         struct sock *sk = sock->sk;
 683         struct x25_sock *x25 = x25_sk(sk);
 684         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 685         struct x25_route *rt;
 686         int rc = 0;
 687
 688         lock_sock(sk);
 689         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 690                 sock->state = SS_CONNECTED;
 691                 goto out; /* Connect completed during a ERESTARTSYS event */
 692         }
 693
 694         rc = -ECONNREFUSED;
 695         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 696                 sock->state = SS_UNCONNECTED;
 697                 goto out;
 698         }
 699
 700         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 701         if (sk->sk_state == TCP_ESTABLISHED)
 702                 goto out;
 703
 704         sk->sk_state   = TCP_CLOSE;
 705         sock->state = SS_UNCONNECTED;
 706
 707         rc = -EINVAL;
 708         if (addr_len != sizeof(struct sockaddr_x25) ||
 709             addr->sx25_family != AF_X25)
 710                 goto out;
 711
 712         rc = -ENETUNREACH;
 713         rt = x25_get_route(&addr->sx25_addr);
 714         if (!rt)
 715                 goto out;
 716
 717         x25->neighbour = x25_get_neigh(rt->dev);
 718         if (!x25->neighbour)
 719                 goto out_put_route;
 720
 721         x25_limit_facilities(&x25->facilities, x25->neighbour);
 722
 723         x25->lci = x25_new_lci(x25->neighbour);
 724         if (!x25->lci)
 725                 goto out_put_neigh;
 726
 727         rc = -EINVAL;
 728         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 729                 goto out_put_neigh;
 730
 731         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 732                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 733
 734         x25->dest_addr = addr->sx25_addr;
 735
 736         /* Move to connecting socket, start sending Connect Requests */
 737         sock->state   = SS_CONNECTING;
 738         sk->sk_state  = TCP_SYN_SENT;
 739
 740         x25->state = X25_STATE_1;
 741
 742         x25_write_internal(sk, X25_CALL_REQUEST);
 743
 744         x25_start_heartbeat(sk);
 745         x25_start_t21timer(sk);
 746
 747         /* Now the loop */
 748         rc = -EINPROGRESS;
 749         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 750                 goto out_put_neigh;
 751
 752         rc = x25_wait_for_connection_establishment(sk);
 753         if (rc)
 754                 goto out_put_neigh;
 755
 756         sock->state = SS_CONNECTED;
 757         rc = 0;
 758 out_put_neigh:
 759         if (rc)
 760                 x25_neigh_put(x25->neighbour);
 761 out_put_route:
 762         x25_route_put(rt);
 763 out:
 764         release_sock(sk);
 765         return rc;
 766 }
 767
 768 static int x25_wait_for_data(struct sock *sk, long timeout)
 769 {
 770         DECLARE_WAITQUEUE(wait, current);
 771         int rc = 0;
 772
 773         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 774         for (;;) {
 775                 __set_current_state(TASK_INTERRUPTIBLE);
 776                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 777                         break;
 778                 rc = -ERESTARTSYS;
 779                 if (signal_pending(current))
 780                         break;
 781                 rc = -EAGAIN;
 782                 if (!timeout)
 783                         break;
 784                 rc = 0;
 785                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 786                         release_sock(sk);
 787                         timeout = schedule_timeout(timeout);
 788                         lock_sock(sk);
 789                 } else
 790                         break;
 791         }
 792         __set_current_state(TASK_RUNNING);
 793         remove_wait_queue(sk->sk_sleep, &wait);
 794         return rc;
 795 }
 796
 797 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 798 {
 799         struct sock *sk = sock->sk;
 800         struct sock *newsk;
 801         struct sk_buff *skb;
 802         int rc = -EINVAL;
 803
 804         if (!sk || sk->sk_state != TCP_LISTEN)
 805                 goto out;
 806
 807         rc = -EOPNOTSUPP;
 808         if (sk->sk_type != SOCK_SEQPACKET)
 809                 goto out;
 810
 811         lock_sock(sk);
 812         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 813         if (rc)
 814                 goto out2;
 815         skb = skb_dequeue(&sk->sk_receive_queue);
 816         rc = -EINVAL;
 817         if (!skb->sk)
 818                 goto out2;
 819         newsk            = skb->sk;
 820         sock_graft(newsk, newsock);
 821
 822         /* Now attach up the new socket */
 823         skb->sk = NULL;
 824         kfree_skb(skb);
 825         sk->sk_ack_backlog--;
 826         newsock->state = SS_CONNECTED;
 827         rc = 0;
 828 out2:
 829         release_sock(sk);
 830 out:
 831         return rc;
 832 }
 833
 834 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 835                        int *uaddr_len, int peer)
 836 {
 837         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 838         struct sock *sk = sock->sk;
 839         struct x25_sock *x25 = x25_sk(sk);
 840
 841         if (peer) {
 842                 if (sk->sk_state != TCP_ESTABLISHED)
 843                         return -ENOTCONN;
 844                 sx25->sx25_addr = x25->dest_addr;
 845         } else
 846                 sx25->sx25_addr = x25->source_addr;
 847
 848         sx25->sx25_family = AF_X25;
 849         *uaddr_len = sizeof(*sx25);
 850
 851         return 0;
 852 }
 853
 854 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 855                         unsigned int lci)
 856 {
 857         struct sock *sk;
 858         struct sock *make;
 859         struct x25_sock *makex25;
 860         struct x25_address source_addr, dest_addr;
 861         struct x25_facilities facilities;
 862         struct x25_dte_facilities dte_facilities;
 863         int len, addr_len, rc;
 864
 865         /*
 866          *      Remove the LCI and frame type.
 867          */
 868         skb_pull(skb, X25_STD_MIN_LEN);
 869
 870         /*
 871          *      Extract the X.25 addresses and convert them to ASCII strings,
 872          *      and remove them.
 873          */
 874         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 875         skb_pull(skb, addr_len);
 876
 877         /*
 878          *      Get the length of the facilities, skip past them for the moment
 879          *      get the call user data because this is needed to determine
 880          *      the correct listener
 881          */
 882         len = skb->data[0] + 1;
 883         skb_pull(skb,len);
 884
 885         /*
 886          *      Find a listener for the particular address/cud pair.
 887          */
 888         sk = x25_find_listener(&source_addr,skb);
 889         skb_push(skb,len);
 890
 891         if (sk != NULL && sk_acceptq_is_full(sk)) {
 892                 goto out_sock_put;
 893         }
 894
 895         /*
 896          *      We dont have any listeners for this incoming call.
 897          *      Try forwarding it.
 898          */
 899         if (sk == NULL) {
 900                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 901                 if (sysctl_x25_forward &&
 902                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 903                 {
 904                         /* Call was forwarded, dont process it any more */
 905                         kfree_skb(skb);
 906                         rc = 1;
 907                         goto out;
 908                 } else {
 909                         /* No listeners, can't forward, clear the call */
 910                         goto out_clear_request;
 911                 }
 912         }
 913
 914         /*
 915          *      Try to reach a compromise on the requested facilities.
 916          */
 917         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 918         if (len == -1)
 919                 goto out_sock_put;
 920
 921         /*
 922          * current neighbour/link might impose additional limits
 923          * on certain facilties
 924          */
 925
 926         x25_limit_facilities(&facilities, nb);
 927
 928         /*
 929          *      Try to create a new socket.
 930          */
 931         make = x25_make_new(sk);
 932         if (!make)
 933                 goto out_sock_put;
 934
 935         /*
 936          *      Remove the facilities
 937          */
 938         skb_pull(skb, len);
 939
 940         skb->sk     = make;
 941         make->sk_state = TCP_ESTABLISHED;
 942
 943         makex25 = x25_sk(make);
 944         makex25->lci           = lci;
 945         makex25->dest_addr     = dest_addr;
 946         makex25->source_addr   = source_addr;
 947         makex25->neighbour     = nb;
 948         makex25->facilities    = facilities;
 949         makex25->dte_facilities= dte_facilities;
 950         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 951         /* ensure no reverse facil on accept */
 952         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 953         /* ensure no calling address extension on accept */
 954         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 955         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 956
 957         /* Normally all calls are accepted immediatly */
 958         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 959                 x25_write_internal(make, X25_CALL_ACCEPTED);
 960                 makex25->state = X25_STATE_3;
 961         }
 962
 963         /*
 964          *      Incoming Call User Data.
 965          */
 966         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
 967         makex25->calluserdata.cudlength = skb->len;
 968
 969         sk->sk_ack_backlog++;
 970
 971         x25_insert_socket(make);
 972
 973         skb_queue_head(&sk->sk_receive_queue, skb);
 974
 975         x25_start_heartbeat(make);
 976
 977         if (!sock_flag(sk, SOCK_DEAD))
 978                 sk->sk_data_ready(sk, skb->len);
 979         rc = 1;
 980         sock_put(sk);
 981 out:
 982         return rc;
 983 out_sock_put:
 984         sock_put(sk);
 985 out_clear_request:
 986         rc = 0;
 987         x25_transmit_clear_request(nb, lci, 0x01);
 988         goto out;
 989 }
 990
 991 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 992                        struct msghdr *msg, size_t len)
 993 {
 994         struct sock *sk = sock->sk;
 995         struct x25_sock *x25 = x25_sk(sk);
 996         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 997         struct sockaddr_x25 sx25;
 998         struct sk_buff *skb;
 999         unsigned char *asmptr;
1000         int noblock = msg->msg_flags & MSG_DONTWAIT;
1001         size_t size;
1002         int qbit = 0, rc = -EINVAL;
1003
1004         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1005                 goto out;
1006
1007         /* we currently don't support segmented records at the user interface */
1008         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1009                 goto out;
1010
1011         rc = -EADDRNOTAVAIL;
1012         if (sock_flag(sk, SOCK_ZAPPED))
1013                 goto out;
1014
1015         rc = -EPIPE;
1016         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1017                 send_sig(SIGPIPE, current, 0);
1018                 goto out;
1019         }
1020
1021         rc = -ENETUNREACH;
1022         if (!x25->neighbour)
1023                 goto out;
1024
1025         if (usx25) {
1026                 rc = -EINVAL;
1027                 if (msg->msg_namelen < sizeof(sx25))
1028                         goto out;
1029                 memcpy(&sx25, usx25, sizeof(sx25));
1030                 rc = -EISCONN;
1031                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1032                         goto out;
1033                 rc = -EINVAL;
1034                 if (sx25.sx25_family != AF_X25)
1035                         goto out;
1036         } else {
1037                 /*
1038                  *      FIXME 1003.1g - if the socket is like this because
1039                  *      it has become closed (not started closed) we ought
1040                  *      to SIGPIPE, EPIPE;
1041                  */
1042                 rc = -ENOTCONN;
1043                 if (sk->sk_state != TCP_ESTABLISHED)
1044                         goto out;
1045
1046                 sx25.sx25_family = AF_X25;
1047                 sx25.sx25_addr   = x25->dest_addr;
1048         }
1049
1050         /* Sanity check the packet size */
1051         if (len > 65535) {
1052                 rc = -EMSGSIZE;
1053                 goto out;
1054         }
1055
1056         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1057
1058         /* Build a packet */
1059         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1060
1061         if ((msg->msg_flags & MSG_OOB) && len > 32)
1062                 len = 32;
1063
1064         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1065
1066         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1067         if (!skb)
1068                 goto out;
1069         X25_SKB_CB(skb)->flags = msg->msg_flags;
1070
1071         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1072
1073         /*
1074          *      Put the data on the end
1075          */
1076         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1077
1078         skb_reset_transport_header(skb);
1079         skb_put(skb, len);
1080
1081         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1082         if (rc)
1083                 goto out_kfree_skb;
1084
1085         /*
1086          *      If the Q BIT Include socket option is in force, the first
1087          *      byte of the user data is the logical value of the Q Bit.
1088          */
1089         if (x25->qbitincl) {
1090                 qbit = skb->data[0];
1091                 skb_pull(skb, 1);
1092         }
1093
1094         /*
1095          *      Push down the X.25 header
1096          */
1097         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1098
1099         if (msg->msg_flags & MSG_OOB) {
1100                 if (x25->neighbour->extended) {
1101                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1102                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1103                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1104                         *asmptr++ = X25_INTERRUPT;
1105                 } else {
1106                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1107                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1108                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1109                         *asmptr++ = X25_INTERRUPT;
1110                 }
1111         } else {
1112                 if (x25->neighbour->extended) {
1113                         /* Build an Extended X.25 header */
1114                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1115                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1116                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1117                         *asmptr++ = X25_DATA;
1118                         *asmptr++ = X25_DATA;
1119                 } else {
1120                         /* Build an Standard X.25 header */
1121                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1122                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1123                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1124                         *asmptr++ = X25_DATA;
1125                 }
1126
1127                 if (qbit)
1128                         skb->data[0] |= X25_Q_BIT;
1129         }
1130
1131         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1132         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1133
1134         rc = -ENOTCONN;
1135         if (sk->sk_state != TCP_ESTABLISHED)
1136                 goto out_kfree_skb;
1137
1138         if (msg->msg_flags & MSG_OOB)
1139                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1140         else {
1141                 rc = x25_output(sk, skb);
1142                 len = rc;
1143                 if (rc < 0)
1144                         kfree_skb(skb);
1145                 else if (x25->qbitincl)
1146                         len++;
1147         }
1148
1149         /*
1150          * lock_sock() is currently only used to serialize this x25_kick()
1151          * against input-driven x25_kick() calls. It currently only blocks
1152          * incoming packets for this socket and does not protect against
1153          * any other socket state changes and is not called from anywhere
1154          * else. As x25_kick() cannot block and as long as all socket
1155          * operations are BKL-wrapped, we don't need take to care about
1156          * purging the backlog queue in x25_release().
1157          *
1158          * Using lock_sock() to protect all socket operations entirely
1159          * (and making the whole x25 stack SMP aware) unfortunately would
1160          * require major changes to {send,recv}msg and skb allocation methods.
1161          * -> 2.5 ;)
1162          */
1163         lock_sock(sk);
1164         x25_kick(sk);
1165         release_sock(sk);
1166         rc = len;
1167 out:
1168         return rc;
1169 out_kfree_skb:
1170         kfree_skb(skb);
1171         goto out;
1172 }
1173
1174
1175 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1176                        struct msghdr *msg, size_t size,
1177                        int flags)
1178 {
1179         struct sock *sk = sock->sk;
1180         struct x25_sock *x25 = x25_sk(sk);
1181         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1182         size_t copied;
1183         int qbit;
1184         struct sk_buff *skb;
1185         unsigned char *asmptr;
1186         int rc = -ENOTCONN;
1187
1188         /*
1189          * This works for seqpacket too. The receiver has ordered the queue for
1190          * us! We do one quick check first though
1191          */
1192         if (sk->sk_state != TCP_ESTABLISHED)
1193                 goto out;
1194
1195         if (flags & MSG_OOB) {
1196                 rc = -EINVAL;
1197                 if (sock_flag(sk, SOCK_URGINLINE) ||
1198                     !skb_peek(&x25->interrupt_in_queue))
1199                         goto out;
1200
1201                 skb = skb_dequeue(&x25->interrupt_in_queue);
1202
1203                 skb_pull(skb, X25_STD_MIN_LEN);
1204
1205                 /*
1206                  *      No Q bit information on Interrupt data.
1207                  */
1208                 if (x25->qbitincl) {
1209                         asmptr  = skb_push(skb, 1);
1210                         *asmptr = 0x00;
1211                 }
1212
1213                 msg->msg_flags |= MSG_OOB;
1214         } else {
1215                 /* Now we can treat all alike */
1216                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1217                                         flags & MSG_DONTWAIT, &rc);
1218                 if (!skb)
1219                         goto out;
1220
1221                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1222
1223                 skb_pull(skb, x25->neighbour->extended ?
1224                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1225
1226                 if (x25->qbitincl) {
1227                         asmptr  = skb_push(skb, 1);
1228                         *asmptr = qbit;
1229                 }
1230         }
1231
1232         skb_reset_transport_header(skb);
1233         copied = skb->len;
1234
1235         if (copied > size) {
1236                 copied = size;
1237                 msg->msg_flags |= MSG_TRUNC;
1238         }
1239
1240         /* Currently, each datagram always contains a complete record */
1241         msg->msg_flags |= MSG_EOR;
1242
1243         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1244         if (rc)
1245                 goto out_free_dgram;
1246
1247         if (sx25) {
1248                 sx25->sx25_family = AF_X25;
1249                 sx25->sx25_addr   = x25->dest_addr;
1250         }
1251
1252         msg->msg_namelen = sizeof(struct sockaddr_x25);
1253
1254         lock_sock(sk);
1255         x25_check_rbuf(sk);
1256         release_sock(sk);
1257         rc = copied;
1258 out_free_dgram:
1259         skb_free_datagram(sk, skb);
1260 out:
1261         return rc;
1262 }
1263
1264
1265 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1266 {
1267         struct sock *sk = sock->sk;
1268         struct x25_sock *x25 = x25_sk(sk);
1269         void __user *argp = (void __user *)arg;
1270         int rc;
1271
1272         switch (cmd) {
1273                 case TIOCOUTQ: {
1274                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1275
1276                         if (amount < 0)
1277                                 amount = 0;
1278                         rc = put_user(amount, (unsigned int __user *)argp);
1279                         break;
1280                 }
1281
1282                 case TIOCINQ: {
1283                         struct sk_buff *skb;
1284                         int amount = 0;
1285                         /*
1286                          * These two are safe on a single CPU system as
1287                          * only user tasks fiddle here
1288                          */
1289                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1290                                 amount = skb->len;
1291                         rc = put_user(amount, (unsigned int __user *)argp);
1292                         break;
1293                 }
1294
1295                 case SIOCGSTAMP:
1296                         rc = -EINVAL;
1297                         if (sk)
1298                                 rc = sock_get_timestamp(sk,
1299                                                 (struct timeval __user *)argp);
1300                         break;
1301                 case SIOCGSTAMPNS:
1302                         rc = -EINVAL;
1303                         if (sk)
1304                                 rc = sock_get_timestampns(sk,
1305                                                 (struct timespec __user *)argp);
1306                         break;
1307                 case SIOCGIFADDR:
1308                 case SIOCSIFADDR:
1309                 case SIOCGIFDSTADDR:
1310                 case SIOCSIFDSTADDR:
1311                 case SIOCGIFBRDADDR:
1312                 case SIOCSIFBRDADDR:
1313                 case SIOCGIFNETMASK:
1314                 case SIOCSIFNETMASK:
1315                 case SIOCGIFMETRIC:
1316                 case SIOCSIFMETRIC:
1317                         rc = -EINVAL;
1318                         break;
1319                 case SIOCADDRT:
1320                 case SIOCDELRT:
1321                         rc = -EPERM;
1322                         if (!capable(CAP_NET_ADMIN))
1323                                 break;
1324                         rc = x25_route_ioctl(cmd, argp);
1325                         break;
1326                 case SIOCX25GSUBSCRIP:
1327                         rc = x25_subscr_ioctl(cmd, argp);
1328                         break;
1329                 case SIOCX25SSUBSCRIP:
1330                         rc = -EPERM;
1331                         if (!capable(CAP_NET_ADMIN))
1332                                 break;
1333                         rc = x25_subscr_ioctl(cmd, argp);
1334                         break;
1335                 case SIOCX25GFACILITIES: {
1336                         struct x25_facilities fac = x25->facilities;
1337                         rc = copy_to_user(argp, &fac,
1338                                           sizeof(fac)) ? -EFAULT : 0;
1339                         break;
1340                 }
1341
1342                 case SIOCX25SFACILITIES: {
1343                         struct x25_facilities facilities;
1344                         rc = -EFAULT;
1345                         if (copy_from_user(&facilities, argp,
1346                                            sizeof(facilities)))
1347                                 break;
1348                         rc = -EINVAL;
1349                         if (sk->sk_state != TCP_LISTEN &&
1350                             sk->sk_state != TCP_CLOSE)
1351                                 break;
1352                         if (facilities.pacsize_in < X25_PS16 ||
1353                             facilities.pacsize_in > X25_PS4096)
1354                                 break;
1355                         if (facilities.pacsize_out < X25_PS16 ||
1356                             facilities.pacsize_out > X25_PS4096)
1357                                 break;
1358                         if (facilities.winsize_in < 1 ||
1359                             facilities.winsize_in > 127)
1360                                 break;
1361                         if (facilities.throughput < 0x03 ||
1362                             facilities.throughput > 0xDD)
1363                                 break;
1364                         if (facilities.reverse &&
1365                                 (facilities.reverse | 0x81)!= 0x81)
1366                                 break;
1367                         x25->facilities = facilities;
1368                         rc = 0;
1369                         break;
1370                 }
1371
1372                 case SIOCX25GDTEFACILITIES: {
1373                         rc = copy_to_user(argp, &x25->dte_facilities,
1374                                                 sizeof(x25->dte_facilities));
1375                         if (rc)
1376                                 rc = -EFAULT;
1377                         break;
1378                 }
1379
1380                 case SIOCX25SDTEFACILITIES: {
1381                         struct x25_dte_facilities dtefacs;
1382                         rc = -EFAULT;
1383                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1384                                 break;
1385                         rc = -EINVAL;
1386                         if (sk->sk_state != TCP_LISTEN &&
1387                                         sk->sk_state != TCP_CLOSE)
1388                                 break;
1389                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1390                                 break;
1391                         if (dtefacs.calling_ae == NULL)
1392                                 break;
1393                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1394                                 break;
1395                         if (dtefacs.called_ae == NULL)
1396                                 break;
1397                         x25->dte_facilities = dtefacs;
1398                         rc = 0;
1399                         break;
1400                 }
1401
1402                 case SIOCX25GCALLUSERDATA: {
1403                         struct x25_calluserdata cud = x25->calluserdata;
1404                         rc = copy_to_user(argp, &cud,
1405                                           sizeof(cud)) ? -EFAULT : 0;
1406                         break;
1407                 }
1408
1409                 case SIOCX25SCALLUSERDATA: {
1410                         struct x25_calluserdata calluserdata;
1411
1412                         rc = -EFAULT;
1413                         if (copy_from_user(&calluserdata, argp,
1414                                            sizeof(calluserdata)))
1415                                 break;
1416                         rc = -EINVAL;
1417                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1418                                 break;
1419                         x25->calluserdata = calluserdata;
1420                         rc = 0;
1421                         break;
1422                 }
1423
1424                 case SIOCX25GCAUSEDIAG: {
1425                         struct x25_causediag causediag;
1426                         causediag = x25->causediag;
1427                         rc = copy_to_user(argp, &causediag,
1428                                           sizeof(causediag)) ? -EFAULT : 0;
1429                         break;
1430                 }
1431
1432                 case SIOCX25SCUDMATCHLEN: {
1433                         struct x25_subaddr sub_addr;
1434                         rc = -EINVAL;
1435                         if(sk->sk_state != TCP_CLOSE)
1436                                 break;
1437                         rc = -EFAULT;
1438                         if (copy_from_user(&sub_addr, argp,
1439                                         sizeof(sub_addr)))
1440                                 break;
1441                         rc = -EINVAL;
1442                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1443                                 break;
1444                         x25->cudmatchlength = sub_addr.cudmatchlength;
1445                         rc = 0;
1446                         break;
1447                 }
1448
1449                 case SIOCX25CALLACCPTAPPRV: {
1450                         rc = -EINVAL;
1451                         if (sk->sk_state != TCP_CLOSE)
1452                                 break;
1453                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1454                         rc = 0;
1455                         break;
1456                 }
1457
1458                 case SIOCX25SENDCALLACCPT:  {
1459                         rc = -EINVAL;
1460                         if (sk->sk_state != TCP_ESTABLISHED)
1461                                 break;
1462                         if (x25->accptapprv)    /* must call accptapprv above */
1463                                 break;
1464                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1465                         x25->state = X25_STATE_3;
1466                         rc = 0;
1467                         break;
1468                 }
1469
1470                 default:
1471                         rc = -ENOIOCTLCMD;
1472                         break;
1473         }
1474
1475         return rc;
1476 }
1477
1478 static struct net_proto_family x25_family_ops = {
1479         .family =       AF_X25,
1480         .create =       x25_create,
1481         .owner  =       THIS_MODULE,
1482 };
1483
1484 #ifdef CONFIG_COMPAT
1485 static int compat_x25_subscr_ioctl(unsigned int cmd,
1486                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1487 {
1488         struct compat_x25_subscrip_struct x25_subscr;
1489         struct x25_neigh *nb;
1490         struct net_device *dev;
1491         int rc = -EINVAL;
1492
1493         rc = -EFAULT;
1494         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1495                 goto out;
1496
1497         rc = -EINVAL;
1498         dev = x25_dev_get(x25_subscr.device);
1499         if (dev == NULL)
1500                 goto out;
1501
1502         nb = x25_get_neigh(dev);
1503         if (nb == NULL)
1504                 goto out_dev_put;
1505
1506         dev_put(dev);
1507
1508         if (cmd == SIOCX25GSUBSCRIP) {
1509                 x25_subscr.extended = nb->extended;
1510                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1511                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1512                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1513         } else {
1514                 rc = -EINVAL;
1515                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1516                         rc = 0;
1517                         nb->extended = x25_subscr.extended;
1518                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1519                 }
1520         }
1521         x25_neigh_put(nb);
1522 out:
1523         return rc;
1524 out_dev_put:
1525         dev_put(dev);
1526         goto out;
1527 }
1528
1529 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1530                                 unsigned long arg)
1531 {
1532         void __user *argp = compat_ptr(arg);
1533         struct sock *sk = sock->sk;
1534
1535         int rc = -ENOIOCTLCMD;
1536
1537         switch(cmd) {
1538         case TIOCOUTQ:
1539         case TIOCINQ:
1540                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1541                 break;
1542         case SIOCGSTAMP:
1543                 rc = -EINVAL;
1544                 if (sk)
1545                         rc = compat_sock_get_timestamp(sk,
1546                                         (struct timeval __user*)argp);
1547                 break;
1548         case SIOCGSTAMPNS:
1549                 rc = -EINVAL;
1550                 if (sk)
1551                         rc = compat_sock_get_timestampns(sk,
1552                                         (struct timespec __user*)argp);
1553                 break;
1554         case SIOCGIFADDR:
1555         case SIOCSIFADDR:
1556         case SIOCGIFDSTADDR:
1557         case SIOCSIFDSTADDR:
1558         case SIOCGIFBRDADDR:
1559         case SIOCSIFBRDADDR:
1560         case SIOCGIFNETMASK:
1561         case SIOCSIFNETMASK:
1562         case SIOCGIFMETRIC:
1563         case SIOCSIFMETRIC:
1564                 rc = -EINVAL;
1565                 break;
1566         case SIOCADDRT:
1567         case SIOCDELRT:
1568                 rc = -EPERM;
1569                 if (!capable(CAP_NET_ADMIN))
1570                         break;
1571                 rc = x25_route_ioctl(cmd, argp);
1572                 break;
1573         case SIOCX25GSUBSCRIP:
1574                 rc = compat_x25_subscr_ioctl(cmd, argp);
1575                 break;
1576         case SIOCX25SSUBSCRIP:
1577                 rc = -EPERM;
1578                 if (!capable(CAP_NET_ADMIN))
1579                         break;
1580                 rc = compat_x25_subscr_ioctl(cmd, argp);
1581                 break;
1582         case SIOCX25GFACILITIES:
1583         case SIOCX25SFACILITIES:
1584         case SIOCX25GDTEFACILITIES:
1585         case SIOCX25SDTEFACILITIES:
1586         case SIOCX25GCALLUSERDATA:
1587         case SIOCX25SCALLUSERDATA:
1588         case SIOCX25GCAUSEDIAG:
1589         case SIOCX25SCUDMATCHLEN:
1590         case SIOCX25CALLACCPTAPPRV:
1591         case SIOCX25SENDCALLACCPT:
1592                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1593                 break;
1594         default:
1595                 rc = -ENOIOCTLCMD;
1596                 break;
1597         }
1598         return rc;
1599 }
1600 #endif
1601
1602 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1603         .family =       AF_X25,
1604         .owner =        THIS_MODULE,
1605         .release =      x25_release,
1606         .bind =         x25_bind,
1607         .connect =      x25_connect,
1608         .socketpair =   sock_no_socketpair,
1609         .accept =       x25_accept,
1610         .getname =      x25_getname,
1611         .poll =         datagram_poll,
1612         .ioctl =        x25_ioctl,
1613 #ifdef CONFIG_COMPAT
1614         .compat_ioctl = compat_x25_ioctl,
1615 #endif
1616         .listen =       x25_listen,
1617         .shutdown =     sock_no_shutdown,
1618         .setsockopt =   x25_setsockopt,
1619         .getsockopt =   x25_getsockopt,
1620         .sendmsg =      x25_sendmsg,
1621         .recvmsg =      x25_recvmsg,
1622         .mmap =         sock_no_mmap,
1623         .sendpage =     sock_no_sendpage,
1624 };
1625
1626 SOCKOPS_WRAP(x25_proto, AF_X25);
1627
1628 static struct packet_type x25_packet_type __read_mostly = {
1629         .type = cpu_to_be16(ETH_P_X25),
1630         .func = x25_lapb_receive_frame,
1631 };
1632
1633 static struct notifier_block x25_dev_notifier = {
1634         .notifier_call = x25_device_event,
1635 };
1636
1637 void x25_kill_by_neigh(struct x25_neigh *nb)
1638 {
1639         struct sock *s;
1640         struct hlist_node *node;
1641
1642         write_lock_bh(&x25_list_lock);
1643
1644         sk_for_each(s, node, &x25_list)
1645                 if (x25_sk(s)->neighbour == nb)
1646                         x25_disconnect(s, ENETUNREACH, 0, 0);
1647
1648         write_unlock_bh(&x25_list_lock);
1649
1650         /* Remove any related forwards */
1651         x25_clear_forward_by_dev(nb->dev);
1652 }
1653
1654 static int __init x25_init(void)
1655 {
1656         int rc = proto_register(&x25_proto, 0);
1657
1658         if (rc != 0)
1659                 goto out;
1660
1661         sock_register(&x25_family_ops);
1662
1663         dev_add_pack(&x25_packet_type);
1664
1665         register_netdevice_notifier(&x25_dev_notifier);
1666
1667         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1668
1669 #ifdef CONFIG_SYSCTL
1670         x25_register_sysctl();
1671 #endif
1672         x25_proc_init();
1673 out:
1674         return rc;
1675 }
1676 module_init(x25_init);
1677
1678 static void __exit x25_exit(void)
1679 {
1680         x25_proc_exit();
1681         x25_link_free();
1682         x25_route_free();
1683
1684 #ifdef CONFIG_SYSCTL
1685         x25_unregister_sysctl();
1686 #endif
1687
1688         unregister_netdevice_notifier(&x25_dev_notifier);
1689
1690         dev_remove_pack(&x25_packet_type);
1691
1692         sock_unregister(AF_X25);
1693         proto_unregister(&x25_proto);
1694 }
1695 module_exit(x25_exit);
1696
1697 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1698 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1699 MODULE_LICENSE("GPL");
1700 MODULE_ALIAS_NETPROTO(PF_X25);