net/x25/af_x25.c

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/capability.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/timer.h>
  44 #include <linux/string.h>
  45 #include <linux/net.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <net/sock.h>
  50 #include <net/tcp_states.h>
  51 #include <asm/uaccess.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  54 #include <linux/notifier.h>
  55 #include <linux/init.h>
  56 #include <linux/compat.h>
  57
  58 #include <net/x25.h>
  59 #include <net/compat.h>
  60
  61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  62 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  63 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  64 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  65 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  66 int sysctl_x25_forward                 = 0;
  67
  68 HLIST_HEAD(x25_list);
  69 DEFINE_RWLOCK(x25_list_lock);
  70
  71 static const struct proto_ops x25_proto_ops;
  72
  73 static struct x25_address null_x25_address = {"               "};
  74
  75 #ifdef CONFIG_COMPAT
  76 struct compat_x25_subscrip_struct {
  77         char device[200-sizeof(compat_ulong_t)];
  78         compat_ulong_t global_facil_mask;
  79         compat_uint_t extended;
  80 };
  81 #endif
  82
  83 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  84                   struct x25_address *calling_addr)
  85 {
  86         int called_len, calling_len;
  87         char *called, *calling;
  88         int i;
  89
  90         called_len  = (*p >> 0) & 0x0F;
  91         calling_len = (*p >> 4) & 0x0F;
  92
  93         called  = called_addr->x25_addr;
  94         calling = calling_addr->x25_addr;
  95         p++;
  96
  97         for (i = 0; i < (called_len + calling_len); i++) {
  98                 if (i < called_len) {
  99                         if (i % 2 != 0) {
 100                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 101                                 p++;
 102                         } else {
 103                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 104                         }
 105                 } else {
 106                         if (i % 2 != 0) {
 107                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 108                                 p++;
 109                         } else {
 110                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 111                         }
 112                 }
 113         }
 114
 115         *called = *calling = '\0';
 116
 117         return 1 + (called_len + calling_len + 1) / 2;
 118 }
 119
 120 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 121                   struct x25_address *calling_addr)
 122 {
 123         unsigned int called_len, calling_len;
 124         char *called, *calling;
 125         int i;
 126
 127         called  = called_addr->x25_addr;
 128         calling = calling_addr->x25_addr;
 129
 130         called_len  = strlen(called);
 131         calling_len = strlen(calling);
 132
 133         *p++ = (calling_len << 4) | (called_len << 0);
 134
 135         for (i = 0; i < (called_len + calling_len); i++) {
 136                 if (i < called_len) {
 137                         if (i % 2 != 0) {
 138                                 *p |= (*called++ - '0') << 0;
 139                                 p++;
 140                         } else {
 141                                 *p = 0x00;
 142                                 *p |= (*called++ - '0') << 4;
 143                         }
 144                 } else {
 145                         if (i % 2 != 0) {
 146                                 *p |= (*calling++ - '0') << 0;
 147                                 p++;
 148                         } else {
 149                                 *p = 0x00;
 150                                 *p |= (*calling++ - '0') << 4;
 151                         }
 152                 }
 153         }
 154
 155         return 1 + (called_len + calling_len + 1) / 2;
 156 }
 157
 158 /*
 159  *      Socket removal during an interrupt is now safe.
 160  */
 161 static void x25_remove_socket(struct sock *sk)
 162 {
 163         write_lock_bh(&x25_list_lock);
 164         sk_del_node_init(sk);
 165         write_unlock_bh(&x25_list_lock);
 166 }
 167
 168 /*
 169  *      Kill all bound sockets on a dropped device.
 170  */
 171 static void x25_kill_by_device(struct net_device *dev)
 172 {
 173         struct sock *s;
 174         struct hlist_node *node;
 175
 176         write_lock_bh(&x25_list_lock);
 177
 178         sk_for_each(s, node, &x25_list)
 179                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 180                         x25_disconnect(s, ENETUNREACH, 0, 0);
 181
 182         write_unlock_bh(&x25_list_lock);
 183 }
 184
 185 /*
 186  *      Handle device status changes.
 187  */
 188 static int x25_device_event(struct notifier_block *this, unsigned long event,
 189                             void *ptr)
 190 {
 191         struct net_device *dev = ptr;
 192         struct x25_neigh *nb;
 193
 194         if (dev->nd_net != &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 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((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 void x25_destroy_socket(struct sock *sk)
 353 {
 354         struct sk_buff *skb;
 355
 356         sock_hold(sk);
 357         lock_sock(sk);
 358         x25_stop_heartbeat(sk);
 359         x25_stop_timer(sk);
 360
 361         x25_remove_socket(sk);
 362         x25_clear_queues(sk);           /* Flush the queues */
 363
 364         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 365                 if (skb->sk != sk) {            /* A pending connection */
 366                         /*
 367                          * Queue the unaccepted socket for death
 368                          */
 369                         sock_set_flag(skb->sk, SOCK_DEAD);
 370                         x25_start_heartbeat(skb->sk);
 371                         x25_sk(skb->sk)->state = X25_STATE_0;
 372                 }
 373
 374                 kfree_skb(skb);
 375         }
 376
 377         if (atomic_read(&sk->sk_wmem_alloc) ||
 378             atomic_read(&sk->sk_rmem_alloc)) {
 379                 /* Defer: outstanding buffers */
 380                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 381                 sk->sk_timer.function = x25_destroy_timer;
 382                 sk->sk_timer.data = (unsigned long)sk;
 383                 add_timer(&sk->sk_timer);
 384         } else {
 385                 /* drop last reference so sock_put will free */
 386                 __sock_put(sk);
 387         }
 388
 389         release_sock(sk);
 390         sock_put(sk);
 391 }
 392
 393 /*
 394  *      Handling for system calls applied via the various interfaces to a
 395  *      X.25 socket object.
 396  */
 397
 398 static int x25_setsockopt(struct socket *sock, int level, int optname,
 399                           char __user *optval, int optlen)
 400 {
 401         int opt;
 402         struct sock *sk = sock->sk;
 403         int rc = -ENOPROTOOPT;
 404
 405         if (level != SOL_X25 || optname != X25_QBITINCL)
 406                 goto out;
 407
 408         rc = -EINVAL;
 409         if (optlen < sizeof(int))
 410                 goto out;
 411
 412         rc = -EFAULT;
 413         if (get_user(opt, (int __user *)optval))
 414                 goto out;
 415
 416         x25_sk(sk)->qbitincl = !!opt;
 417         rc = 0;
 418 out:
 419         return rc;
 420 }
 421
 422 static int x25_getsockopt(struct socket *sock, int level, int optname,
 423                           char __user *optval, int __user *optlen)
 424 {
 425         struct sock *sk = sock->sk;
 426         int val, len, rc = -ENOPROTOOPT;
 427
 428         if (level != SOL_X25 || optname != X25_QBITINCL)
 429                 goto out;
 430
 431         rc = -EFAULT;
 432         if (get_user(len, optlen))
 433                 goto out;
 434
 435         len = min_t(unsigned int, len, sizeof(int));
 436
 437         rc = -EINVAL;
 438         if (len < 0)
 439                 goto out;
 440
 441         rc = -EFAULT;
 442         if (put_user(len, optlen))
 443                 goto out;
 444
 445         val = x25_sk(sk)->qbitincl;
 446         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 447 out:
 448         return rc;
 449 }
 450
 451 static int x25_listen(struct socket *sock, int backlog)
 452 {
 453         struct sock *sk = sock->sk;
 454         int rc = -EOPNOTSUPP;
 455
 456         if (sk->sk_state != TCP_LISTEN) {
 457                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 458                 sk->sk_max_ack_backlog = backlog;
 459                 sk->sk_state           = TCP_LISTEN;
 460                 rc = 0;
 461         }
 462
 463         return rc;
 464 }
 465
 466 static struct proto x25_proto = {
 467         .name     = "X25",
 468         .owner    = THIS_MODULE,
 469         .obj_size = sizeof(struct x25_sock),
 470 };
 471
 472 static struct sock *x25_alloc_socket(struct net *net)
 473 {
 474         struct x25_sock *x25;
 475         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 476
 477         if (!sk)
 478                 goto out;
 479
 480         sock_init_data(NULL, sk);
 481
 482         x25 = x25_sk(sk);
 483         skb_queue_head_init(&x25->ack_queue);
 484         skb_queue_head_init(&x25->fragment_queue);
 485         skb_queue_head_init(&x25->interrupt_in_queue);
 486         skb_queue_head_init(&x25->interrupt_out_queue);
 487 out:
 488         return sk;
 489 }
 490
 491 static int x25_create(struct net *net, struct socket *sock, int protocol)
 492 {
 493         struct sock *sk;
 494         struct x25_sock *x25;
 495         int rc = -ESOCKTNOSUPPORT;
 496
 497         if (net != &init_net)
 498                 return -EAFNOSUPPORT;
 499
 500         if (sock->type != SOCK_SEQPACKET || protocol)
 501                 goto out;
 502
 503         rc = -ENOMEM;
 504         if ((sk = x25_alloc_socket(net)) == NULL)
 505                 goto out;
 506
 507         x25 = x25_sk(sk);
 508
 509         sock_init_data(sock, sk);
 510
 511         x25_init_timers(sk);
 512
 513         sock->ops    = &x25_proto_ops;
 514         sk->sk_protocol = protocol;
 515         sk->sk_backlog_rcv = x25_backlog_rcv;
 516
 517         x25->t21   = sysctl_x25_call_request_timeout;
 518         x25->t22   = sysctl_x25_reset_request_timeout;
 519         x25->t23   = sysctl_x25_clear_request_timeout;
 520         x25->t2    = sysctl_x25_ack_holdback_timeout;
 521         x25->state = X25_STATE_0;
 522         x25->cudmatchlength = 0;
 523         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 524                                                         /* on call accept   */
 525
 526         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 527         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 528         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 529         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 530         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 531         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 532         x25->dte_facilities.calling_len = 0;
 533         x25->dte_facilities.called_len = 0;
 534         memset(x25->dte_facilities.called_ae, '\0',
 535                         sizeof(x25->dte_facilities.called_ae));
 536         memset(x25->dte_facilities.calling_ae, '\0',
 537                         sizeof(x25->dte_facilities.calling_ae));
 538
 539         rc = 0;
 540 out:
 541         return rc;
 542 }
 543
 544 static struct sock *x25_make_new(struct sock *osk)
 545 {
 546         struct sock *sk = NULL;
 547         struct x25_sock *x25, *ox25;
 548
 549         if (osk->sk_type != SOCK_SEQPACKET)
 550                 goto out;
 551
 552         if ((sk = x25_alloc_socket(osk->sk_net)) == NULL)
 553                 goto out;
 554
 555         x25 = x25_sk(sk);
 556
 557         sk->sk_type        = osk->sk_type;
 558         sk->sk_socket      = osk->sk_socket;
 559         sk->sk_priority    = osk->sk_priority;
 560         sk->sk_protocol    = osk->sk_protocol;
 561         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 562         sk->sk_sndbuf      = osk->sk_sndbuf;
 563         sk->sk_state       = TCP_ESTABLISHED;
 564         sk->sk_sleep       = osk->sk_sleep;
 565         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 566         sock_copy_flags(sk, osk);
 567
 568         ox25 = x25_sk(osk);
 569         x25->t21        = ox25->t21;
 570         x25->t22        = ox25->t22;
 571         x25->t23        = ox25->t23;
 572         x25->t2         = ox25->t2;
 573         x25->facilities = ox25->facilities;
 574         x25->qbitincl   = ox25->qbitincl;
 575         x25->dte_facilities = ox25->dte_facilities;
 576         x25->cudmatchlength = ox25->cudmatchlength;
 577         x25->accptapprv = ox25->accptapprv;
 578
 579         x25_init_timers(sk);
 580 out:
 581         return sk;
 582 }
 583
 584 static int x25_release(struct socket *sock)
 585 {
 586         struct sock *sk = sock->sk;
 587         struct x25_sock *x25;
 588
 589         if (!sk)
 590                 goto out;
 591
 592         x25 = x25_sk(sk);
 593
 594         switch (x25->state) {
 595
 596                 case X25_STATE_0:
 597                 case X25_STATE_2:
 598                         x25_disconnect(sk, 0, 0, 0);
 599                         x25_destroy_socket(sk);
 600                         goto out;
 601
 602                 case X25_STATE_1:
 603                 case X25_STATE_3:
 604                 case X25_STATE_4:
 605                         x25_clear_queues(sk);
 606                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 607                         x25_start_t23timer(sk);
 608                         x25->state = X25_STATE_2;
 609                         sk->sk_state    = TCP_CLOSE;
 610                         sk->sk_shutdown |= SEND_SHUTDOWN;
 611                         sk->sk_state_change(sk);
 612                         sock_set_flag(sk, SOCK_DEAD);
 613                         sock_set_flag(sk, SOCK_DESTROY);
 614                         break;
 615         }
 616
 617         sock->sk        = NULL;
 618         sk->sk_socket   = NULL; /* Not used, but we should do this */
 619 out:
 620         return 0;
 621 }
 622
 623 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 624 {
 625         struct sock *sk = sock->sk;
 626         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 627
 628         if (!sock_flag(sk, SOCK_ZAPPED) ||
 629             addr_len != sizeof(struct sockaddr_x25) ||
 630             addr->sx25_family != AF_X25)
 631                 return -EINVAL;
 632
 633         x25_sk(sk)->source_addr = addr->sx25_addr;
 634         x25_insert_socket(sk);
 635         sock_reset_flag(sk, SOCK_ZAPPED);
 636         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 637
 638         return 0;
 639 }
 640
 641 static int x25_wait_for_connection_establishment(struct sock *sk)
 642 {
 643         DECLARE_WAITQUEUE(wait, current);
 644         int rc;
 645
 646         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 647         for (;;) {
 648                 __set_current_state(TASK_INTERRUPTIBLE);
 649                 rc = -ERESTARTSYS;
 650                 if (signal_pending(current))
 651                         break;
 652                 rc = sock_error(sk);
 653                 if (rc) {
 654                         sk->sk_socket->state = SS_UNCONNECTED;
 655                         break;
 656                 }
 657                 rc = 0;
 658                 if (sk->sk_state != TCP_ESTABLISHED) {
 659                         release_sock(sk);
 660                         schedule();
 661                         lock_sock(sk);
 662                 } else
 663                         break;
 664         }
 665         __set_current_state(TASK_RUNNING);
 666         remove_wait_queue(sk->sk_sleep, &wait);
 667         return rc;
 668 }
 669
 670 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 671                        int addr_len, int flags)
 672 {
 673         struct sock *sk = sock->sk;
 674         struct x25_sock *x25 = x25_sk(sk);
 675         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 676         struct x25_route *rt;
 677         int rc = 0;
 678
 679         lock_sock(sk);
 680         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 681                 sock->state = SS_CONNECTED;
 682                 goto out; /* Connect completed during a ERESTARTSYS event */
 683         }
 684
 685         rc = -ECONNREFUSED;
 686         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 687                 sock->state = SS_UNCONNECTED;
 688                 goto out;
 689         }
 690
 691         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 692         if (sk->sk_state == TCP_ESTABLISHED)
 693                 goto out;
 694
 695         sk->sk_state   = TCP_CLOSE;
 696         sock->state = SS_UNCONNECTED;
 697
 698         rc = -EINVAL;
 699         if (addr_len != sizeof(struct sockaddr_x25) ||
 700             addr->sx25_family != AF_X25)
 701                 goto out;
 702
 703         rc = -ENETUNREACH;
 704         rt = x25_get_route(&addr->sx25_addr);
 705         if (!rt)
 706                 goto out;
 707
 708         x25->neighbour = x25_get_neigh(rt->dev);
 709         if (!x25->neighbour)
 710                 goto out_put_route;
 711
 712         x25_limit_facilities(&x25->facilities, x25->neighbour);
 713
 714         x25->lci = x25_new_lci(x25->neighbour);
 715         if (!x25->lci)
 716                 goto out_put_neigh;
 717
 718         rc = -EINVAL;
 719         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 720                 goto out_put_neigh;
 721
 722         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 723                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 724
 725         x25->dest_addr = addr->sx25_addr;
 726
 727         /* Move to connecting socket, start sending Connect Requests */
 728         sock->state   = SS_CONNECTING;
 729         sk->sk_state  = TCP_SYN_SENT;
 730
 731         x25->state = X25_STATE_1;
 732
 733         x25_write_internal(sk, X25_CALL_REQUEST);
 734
 735         x25_start_heartbeat(sk);
 736         x25_start_t21timer(sk);
 737
 738         /* Now the loop */
 739         rc = -EINPROGRESS;
 740         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 741                 goto out_put_neigh;
 742
 743         rc = x25_wait_for_connection_establishment(sk);
 744         if (rc)
 745                 goto out_put_neigh;
 746
 747         sock->state = SS_CONNECTED;
 748         rc = 0;
 749 out_put_neigh:
 750         if (rc)
 751                 x25_neigh_put(x25->neighbour);
 752 out_put_route:
 753         x25_route_put(rt);
 754 out:
 755         release_sock(sk);
 756         return rc;
 757 }
 758
 759 static int x25_wait_for_data(struct sock *sk, long timeout)
 760 {
 761         DECLARE_WAITQUEUE(wait, current);
 762         int rc = 0;
 763
 764         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 765         for (;;) {
 766                 __set_current_state(TASK_INTERRUPTIBLE);
 767                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 768                         break;
 769                 rc = -ERESTARTSYS;
 770                 if (signal_pending(current))
 771                         break;
 772                 rc = -EAGAIN;
 773                 if (!timeout)
 774                         break;
 775                 rc = 0;
 776                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 777                         release_sock(sk);
 778                         timeout = schedule_timeout(timeout);
 779                         lock_sock(sk);
 780                 } else
 781                         break;
 782         }
 783         __set_current_state(TASK_RUNNING);
 784         remove_wait_queue(sk->sk_sleep, &wait);
 785         return rc;
 786 }
 787
 788 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 789 {
 790         struct sock *sk = sock->sk;
 791         struct sock *newsk;
 792         struct sk_buff *skb;
 793         int rc = -EINVAL;
 794
 795         if (!sk || sk->sk_state != TCP_LISTEN)
 796                 goto out;
 797
 798         rc = -EOPNOTSUPP;
 799         if (sk->sk_type != SOCK_SEQPACKET)
 800                 goto out;
 801
 802         lock_sock(sk);
 803         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 804         if (rc)
 805                 goto out2;
 806         skb = skb_dequeue(&sk->sk_receive_queue);
 807         rc = -EINVAL;
 808         if (!skb->sk)
 809                 goto out2;
 810         newsk            = skb->sk;
 811         newsk->sk_socket = newsock;
 812         newsk->sk_sleep  = &newsock->wait;
 813
 814         /* Now attach up the new socket */
 815         skb->sk = NULL;
 816         kfree_skb(skb);
 817         sk->sk_ack_backlog--;
 818         newsock->sk    = newsk;
 819         newsock->state = SS_CONNECTED;
 820         rc = 0;
 821 out2:
 822         release_sock(sk);
 823 out:
 824         return rc;
 825 }
 826
 827 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 828                        int *uaddr_len, int peer)
 829 {
 830         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 831         struct sock *sk = sock->sk;
 832         struct x25_sock *x25 = x25_sk(sk);
 833
 834         if (peer) {
 835                 if (sk->sk_state != TCP_ESTABLISHED)
 836                         return -ENOTCONN;
 837                 sx25->sx25_addr = x25->dest_addr;
 838         } else
 839                 sx25->sx25_addr = x25->source_addr;
 840
 841         sx25->sx25_family = AF_X25;
 842         *uaddr_len = sizeof(*sx25);
 843
 844         return 0;
 845 }
 846
 847 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 848                         unsigned int lci)
 849 {
 850         struct sock *sk;
 851         struct sock *make;
 852         struct x25_sock *makex25;
 853         struct x25_address source_addr, dest_addr;
 854         struct x25_facilities facilities;
 855         struct x25_dte_facilities dte_facilities;
 856         int len, addr_len, rc;
 857
 858         /*
 859          *      Remove the LCI and frame type.
 860          */
 861         skb_pull(skb, X25_STD_MIN_LEN);
 862
 863         /*
 864          *      Extract the X.25 addresses and convert them to ASCII strings,
 865          *      and remove them.
 866          */
 867         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 868         skb_pull(skb, addr_len);
 869
 870         /*
 871          *      Get the length of the facilities, skip past them for the moment
 872          *      get the call user data because this is needed to determine
 873          *      the correct listener
 874          */
 875         len = skb->data[0] + 1;
 876         skb_pull(skb,len);
 877
 878         /*
 879          *      Find a listener for the particular address/cud pair.
 880          */
 881         sk = x25_find_listener(&source_addr,skb);
 882         skb_push(skb,len);
 883
 884         if (sk != NULL && sk_acceptq_is_full(sk)) {
 885                 goto out_sock_put;
 886         }
 887
 888         /*
 889          *      We dont have any listeners for this incoming call.
 890          *      Try forwarding it.
 891          */
 892         if (sk == NULL) {
 893                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 894                 if (sysctl_x25_forward &&
 895                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 896                 {
 897                         /* Call was forwarded, dont process it any more */
 898                         kfree_skb(skb);
 899                         rc = 1;
 900                         goto out;
 901                 } else {
 902                         /* No listeners, can't forward, clear the call */
 903                         goto out_clear_request;
 904                 }
 905         }
 906
 907         /*
 908          *      Try to reach a compromise on the requested facilities.
 909          */
 910         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 911         if (len == -1)
 912                 goto out_sock_put;
 913
 914         /*
 915          * current neighbour/link might impose additional limits
 916          * on certain facilties
 917          */
 918
 919         x25_limit_facilities(&facilities, nb);
 920
 921         /*
 922          *      Try to create a new socket.
 923          */
 924         make = x25_make_new(sk);
 925         if (!make)
 926                 goto out_sock_put;
 927
 928         /*
 929          *      Remove the facilities
 930          */
 931         skb_pull(skb, len);
 932
 933         skb->sk     = make;
 934         make->sk_state = TCP_ESTABLISHED;
 935
 936         makex25 = x25_sk(make);
 937         makex25->lci           = lci;
 938         makex25->dest_addr     = dest_addr;
 939         makex25->source_addr   = source_addr;
 940         makex25->neighbour     = nb;
 941         makex25->facilities    = facilities;
 942         makex25->dte_facilities= dte_facilities;
 943         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 944         /* ensure no reverse facil on accept */
 945         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 946         /* ensure no calling address extension on accept */
 947         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 948         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 949
 950         /* Normally all calls are accepted immediatly */
 951         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 952                 x25_write_internal(make, X25_CALL_ACCEPTED);
 953                 makex25->state = X25_STATE_3;
 954         }
 955
 956         /*
 957          *      Incoming Call User Data.
 958          */
 959         if (skb->len >= 0) {
 960                 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
 961                 makex25->calluserdata.cudlength = skb->len;
 962         }
 963
 964         sk->sk_ack_backlog++;
 965
 966         x25_insert_socket(make);
 967
 968         skb_queue_head(&sk->sk_receive_queue, skb);
 969
 970         x25_start_heartbeat(make);
 971
 972         if (!sock_flag(sk, SOCK_DEAD))
 973                 sk->sk_data_ready(sk, skb->len);
 974         rc = 1;
 975         sock_put(sk);
 976 out:
 977         return rc;
 978 out_sock_put:
 979         sock_put(sk);
 980 out_clear_request:
 981         rc = 0;
 982         x25_transmit_clear_request(nb, lci, 0x01);
 983         goto out;
 984 }
 985
 986 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 987                        struct msghdr *msg, size_t len)
 988 {
 989         struct sock *sk = sock->sk;
 990         struct x25_sock *x25 = x25_sk(sk);
 991         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 992         struct sockaddr_x25 sx25;
 993         struct sk_buff *skb;
 994         unsigned char *asmptr;
 995         int noblock = msg->msg_flags & MSG_DONTWAIT;
 996         size_t size;
 997         int qbit = 0, rc = -EINVAL;
 998
 999         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1000                 goto out;
1001
1002         /* we currently don't support segmented records at the user interface */
1003         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1004                 goto out;
1005
1006         rc = -EADDRNOTAVAIL;
1007         if (sock_flag(sk, SOCK_ZAPPED))
1008                 goto out;
1009
1010         rc = -EPIPE;
1011         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1012                 send_sig(SIGPIPE, current, 0);
1013                 goto out;
1014         }
1015
1016         rc = -ENETUNREACH;
1017         if (!x25->neighbour)
1018                 goto out;
1019
1020         if (usx25) {
1021                 rc = -EINVAL;
1022                 if (msg->msg_namelen < sizeof(sx25))
1023                         goto out;
1024                 memcpy(&sx25, usx25, sizeof(sx25));
1025                 rc = -EISCONN;
1026                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1027                         goto out;
1028                 rc = -EINVAL;
1029                 if (sx25.sx25_family != AF_X25)
1030                         goto out;
1031         } else {
1032                 /*
1033                  *      FIXME 1003.1g - if the socket is like this because
1034                  *      it has become closed (not started closed) we ought
1035                  *      to SIGPIPE, EPIPE;
1036                  */
1037                 rc = -ENOTCONN;
1038                 if (sk->sk_state != TCP_ESTABLISHED)
1039                         goto out;
1040
1041                 sx25.sx25_family = AF_X25;
1042                 sx25.sx25_addr   = x25->dest_addr;
1043         }
1044
1045         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1046
1047         /* Build a packet */
1048         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1049
1050         if ((msg->msg_flags & MSG_OOB) && len > 32)
1051                 len = 32;
1052
1053         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1054
1055         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1056         if (!skb)
1057                 goto out;
1058         X25_SKB_CB(skb)->flags = msg->msg_flags;
1059
1060         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1061
1062         /*
1063          *      Put the data on the end
1064          */
1065         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1066
1067         skb_reset_transport_header(skb);
1068         skb_put(skb, len);
1069
1070         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1071         if (rc)
1072                 goto out_kfree_skb;
1073
1074         /*
1075          *      If the Q BIT Include socket option is in force, the first
1076          *      byte of the user data is the logical value of the Q Bit.
1077          */
1078         if (x25->qbitincl) {
1079                 qbit = skb->data[0];
1080                 skb_pull(skb, 1);
1081         }
1082
1083         /*
1084          *      Push down the X.25 header
1085          */
1086         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1087
1088         if (msg->msg_flags & MSG_OOB) {
1089                 if (x25->neighbour->extended) {
1090                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1091                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1092                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1093                         *asmptr++ = X25_INTERRUPT;
1094                 } else {
1095                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1096                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1097                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1098                         *asmptr++ = X25_INTERRUPT;
1099                 }
1100         } else {
1101                 if (x25->neighbour->extended) {
1102                         /* Build an Extended X.25 header */
1103                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1104                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1105                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1106                         *asmptr++ = X25_DATA;
1107                         *asmptr++ = X25_DATA;
1108                 } else {
1109                         /* Build an Standard X.25 header */
1110                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1111                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1112                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1113                         *asmptr++ = X25_DATA;
1114                 }
1115
1116                 if (qbit)
1117                         skb->data[0] |= X25_Q_BIT;
1118         }
1119
1120         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1121         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1122
1123         rc = -ENOTCONN;
1124         if (sk->sk_state != TCP_ESTABLISHED)
1125                 goto out_kfree_skb;
1126
1127         if (msg->msg_flags & MSG_OOB)
1128                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1129         else {
1130                 len = x25_output(sk, skb);
1131                 if (len < 0)
1132                         kfree_skb(skb);
1133                 else if (x25->qbitincl)
1134                         len++;
1135         }
1136
1137         /*
1138          * lock_sock() is currently only used to serialize this x25_kick()
1139          * against input-driven x25_kick() calls. It currently only blocks
1140          * incoming packets for this socket and does not protect against
1141          * any other socket state changes and is not called from anywhere
1142          * else. As x25_kick() cannot block and as long as all socket
1143          * operations are BKL-wrapped, we don't need take to care about
1144          * purging the backlog queue in x25_release().
1145          *
1146          * Using lock_sock() to protect all socket operations entirely
1147          * (and making the whole x25 stack SMP aware) unfortunately would
1148          * require major changes to {send,recv}msg and skb allocation methods.
1149          * -> 2.5 ;)
1150          */
1151         lock_sock(sk);
1152         x25_kick(sk);
1153         release_sock(sk);
1154         rc = len;
1155 out:
1156         return rc;
1157 out_kfree_skb:
1158         kfree_skb(skb);
1159         goto out;
1160 }
1161
1162
1163 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1164                        struct msghdr *msg, size_t size,
1165                        int flags)
1166 {
1167         struct sock *sk = sock->sk;
1168         struct x25_sock *x25 = x25_sk(sk);
1169         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1170         size_t copied;
1171         int qbit;
1172         struct sk_buff *skb;
1173         unsigned char *asmptr;
1174         int rc = -ENOTCONN;
1175
1176         /*
1177          * This works for seqpacket too. The receiver has ordered the queue for
1178          * us! We do one quick check first though
1179          */
1180         if (sk->sk_state != TCP_ESTABLISHED)
1181                 goto out;
1182
1183         if (flags & MSG_OOB) {
1184                 rc = -EINVAL;
1185                 if (sock_flag(sk, SOCK_URGINLINE) ||
1186                     !skb_peek(&x25->interrupt_in_queue))
1187                         goto out;
1188
1189                 skb = skb_dequeue(&x25->interrupt_in_queue);
1190
1191                 skb_pull(skb, X25_STD_MIN_LEN);
1192
1193                 /*
1194                  *      No Q bit information on Interrupt data.
1195                  */
1196                 if (x25->qbitincl) {
1197                         asmptr  = skb_push(skb, 1);
1198                         *asmptr = 0x00;
1199                 }
1200
1201                 msg->msg_flags |= MSG_OOB;
1202         } else {
1203                 /* Now we can treat all alike */
1204                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1205                                         flags & MSG_DONTWAIT, &rc);
1206                 if (!skb)
1207                         goto out;
1208
1209                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1210
1211                 skb_pull(skb, x25->neighbour->extended ?
1212                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1213
1214                 if (x25->qbitincl) {
1215                         asmptr  = skb_push(skb, 1);
1216                         *asmptr = qbit;
1217                 }
1218         }
1219
1220         skb_reset_transport_header(skb);
1221         copied = skb->len;
1222
1223         if (copied > size) {
1224                 copied = size;
1225                 msg->msg_flags |= MSG_TRUNC;
1226         }
1227
1228         /* Currently, each datagram always contains a complete record */
1229         msg->msg_flags |= MSG_EOR;
1230
1231         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1232         if (rc)
1233                 goto out_free_dgram;
1234
1235         if (sx25) {
1236                 sx25->sx25_family = AF_X25;
1237                 sx25->sx25_addr   = x25->dest_addr;
1238         }
1239
1240         msg->msg_namelen = sizeof(struct sockaddr_x25);
1241
1242         lock_sock(sk);
1243         x25_check_rbuf(sk);
1244         release_sock(sk);
1245         rc = copied;
1246 out_free_dgram:
1247         skb_free_datagram(sk, skb);
1248 out:
1249         return rc;
1250 }
1251
1252
1253 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1254 {
1255         struct sock *sk = sock->sk;
1256         struct x25_sock *x25 = x25_sk(sk);
1257         void __user *argp = (void __user *)arg;
1258         int rc;
1259
1260         switch (cmd) {
1261                 case TIOCOUTQ: {
1262                         int amount = sk->sk_sndbuf -
1263                                      atomic_read(&sk->sk_wmem_alloc);
1264                         if (amount < 0)
1265                                 amount = 0;
1266                         rc = put_user(amount, (unsigned int __user *)argp);
1267                         break;
1268                 }
1269
1270                 case TIOCINQ: {
1271                         struct sk_buff *skb;
1272                         int amount = 0;
1273                         /*
1274                          * These two are safe on a single CPU system as
1275                          * only user tasks fiddle here
1276                          */
1277                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1278                                 amount = skb->len;
1279                         rc = put_user(amount, (unsigned int __user *)argp);
1280                         break;
1281                 }
1282
1283                 case SIOCGSTAMP:
1284                         rc = -EINVAL;
1285                         if (sk)
1286                                 rc = sock_get_timestamp(sk,
1287                                                 (struct timeval __user *)argp);
1288                         break;
1289                 case SIOCGSTAMPNS:
1290                         rc = -EINVAL;
1291                         if (sk)
1292                                 rc = sock_get_timestampns(sk,
1293                                                 (struct timespec __user *)argp);
1294                         break;
1295                 case SIOCGIFADDR:
1296                 case SIOCSIFADDR:
1297                 case SIOCGIFDSTADDR:
1298                 case SIOCSIFDSTADDR:
1299                 case SIOCGIFBRDADDR:
1300                 case SIOCSIFBRDADDR:
1301                 case SIOCGIFNETMASK:
1302                 case SIOCSIFNETMASK:
1303                 case SIOCGIFMETRIC:
1304                 case SIOCSIFMETRIC:
1305                         rc = -EINVAL;
1306                         break;
1307                 case SIOCADDRT:
1308                 case SIOCDELRT:
1309                         rc = -EPERM;
1310                         if (!capable(CAP_NET_ADMIN))
1311                                 break;
1312                         rc = x25_route_ioctl(cmd, argp);
1313                         break;
1314                 case SIOCX25GSUBSCRIP:
1315                         rc = x25_subscr_ioctl(cmd, argp);
1316                         break;
1317                 case SIOCX25SSUBSCRIP:
1318                         rc = -EPERM;
1319                         if (!capable(CAP_NET_ADMIN))
1320                                 break;
1321                         rc = x25_subscr_ioctl(cmd, argp);
1322                         break;
1323                 case SIOCX25GFACILITIES: {
1324                         struct x25_facilities fac = x25->facilities;
1325                         rc = copy_to_user(argp, &fac,
1326                                           sizeof(fac)) ? -EFAULT : 0;
1327                         break;
1328                 }
1329
1330                 case SIOCX25SFACILITIES: {
1331                         struct x25_facilities facilities;
1332                         rc = -EFAULT;
1333                         if (copy_from_user(&facilities, argp,
1334                                            sizeof(facilities)))
1335                                 break;
1336                         rc = -EINVAL;
1337                         if (sk->sk_state != TCP_LISTEN &&
1338                             sk->sk_state != TCP_CLOSE)
1339                                 break;
1340                         if (facilities.pacsize_in < X25_PS16 ||
1341                             facilities.pacsize_in > X25_PS4096)
1342                                 break;
1343                         if (facilities.pacsize_out < X25_PS16 ||
1344                             facilities.pacsize_out > X25_PS4096)
1345                                 break;
1346                         if (facilities.winsize_in < 1 ||
1347                             facilities.winsize_in > 127)
1348                                 break;
1349                         if (facilities.throughput < 0x03 ||
1350                             facilities.throughput > 0xDD)
1351                                 break;
1352                         if (facilities.reverse &&
1353                                 (facilities.reverse | 0x81)!= 0x81)
1354                                 break;
1355                         x25->facilities = facilities;
1356                         rc = 0;
1357                         break;
1358                 }
1359
1360                 case SIOCX25GDTEFACILITIES: {
1361                         rc = copy_to_user(argp, &x25->dte_facilities,
1362                                                 sizeof(x25->dte_facilities));
1363                         if (rc)
1364                                 rc = -EFAULT;
1365                         break;
1366                 }
1367
1368                 case SIOCX25SDTEFACILITIES: {
1369                         struct x25_dte_facilities dtefacs;
1370                         rc = -EFAULT;
1371                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1372                                 break;
1373                         rc = -EINVAL;
1374                         if (sk->sk_state != TCP_LISTEN &&
1375                                         sk->sk_state != TCP_CLOSE)
1376                                 break;
1377                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1378                                 break;
1379                         if (dtefacs.calling_ae == NULL)
1380                                 break;
1381                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1382                                 break;
1383                         if (dtefacs.called_ae == NULL)
1384                                 break;
1385                         x25->dte_facilities = dtefacs;
1386                         rc = 0;
1387                         break;
1388                 }
1389
1390                 case SIOCX25GCALLUSERDATA: {
1391                         struct x25_calluserdata cud = x25->calluserdata;
1392                         rc = copy_to_user(argp, &cud,
1393                                           sizeof(cud)) ? -EFAULT : 0;
1394                         break;
1395                 }
1396
1397                 case SIOCX25SCALLUSERDATA: {
1398                         struct x25_calluserdata calluserdata;
1399
1400                         rc = -EFAULT;
1401                         if (copy_from_user(&calluserdata, argp,
1402                                            sizeof(calluserdata)))
1403                                 break;
1404                         rc = -EINVAL;
1405                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1406                                 break;
1407                         x25->calluserdata = calluserdata;
1408                         rc = 0;
1409                         break;
1410                 }
1411
1412                 case SIOCX25GCAUSEDIAG: {
1413                         struct x25_causediag causediag;
1414                         causediag = x25->causediag;
1415                         rc = copy_to_user(argp, &causediag,
1416                                           sizeof(causediag)) ? -EFAULT : 0;
1417                         break;
1418                 }
1419
1420                 case SIOCX25SCUDMATCHLEN: {
1421                         struct x25_subaddr sub_addr;
1422                         rc = -EINVAL;
1423                         if(sk->sk_state != TCP_CLOSE)
1424                                 break;
1425                         rc = -EFAULT;
1426                         if (copy_from_user(&sub_addr, argp,
1427                                         sizeof(sub_addr)))
1428                                 break;
1429                         rc = -EINVAL;
1430                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1431                                 break;
1432                         x25->cudmatchlength = sub_addr.cudmatchlength;
1433                         rc = 0;
1434                         break;
1435                 }
1436
1437                 case SIOCX25CALLACCPTAPPRV: {
1438                         rc = -EINVAL;
1439                         if (sk->sk_state != TCP_CLOSE)
1440                                 break;
1441                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1442                         rc = 0;
1443                         break;
1444                 }
1445
1446                 case SIOCX25SENDCALLACCPT:  {
1447                         rc = -EINVAL;
1448                         if (sk->sk_state != TCP_ESTABLISHED)
1449                                 break;
1450                         if (x25->accptapprv)    /* must call accptapprv above */
1451                                 break;
1452                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1453                         x25->state = X25_STATE_3;
1454                         rc = 0;
1455                         break;
1456                 }
1457
1458                 default:
1459                         rc = -ENOIOCTLCMD;
1460                         break;
1461         }
1462
1463         return rc;
1464 }
1465
1466 static struct net_proto_family x25_family_ops = {
1467         .family =       AF_X25,
1468         .create =       x25_create,
1469         .owner  =       THIS_MODULE,
1470 };
1471
1472 #ifdef CONFIG_COMPAT
1473 static int compat_x25_subscr_ioctl(unsigned int cmd,
1474                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1475 {
1476         struct compat_x25_subscrip_struct x25_subscr;
1477         struct x25_neigh *nb;
1478         struct net_device *dev;
1479         int rc = -EINVAL;
1480
1481         rc = -EFAULT;
1482         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1483                 goto out;
1484
1485         rc = -EINVAL;
1486         dev = x25_dev_get(x25_subscr.device);
1487         if (dev == NULL)
1488                 goto out;
1489
1490         nb = x25_get_neigh(dev);
1491         if (nb == NULL)
1492                 goto out_dev_put;
1493
1494         dev_put(dev);
1495
1496         if (cmd == SIOCX25GSUBSCRIP) {
1497                 x25_subscr.extended = nb->extended;
1498                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1499                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1500                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1501         } else {
1502                 rc = -EINVAL;
1503                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1504                         rc = 0;
1505                         nb->extended = x25_subscr.extended;
1506                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1507                 }
1508         }
1509         x25_neigh_put(nb);
1510 out:
1511         return rc;
1512 out_dev_put:
1513         dev_put(dev);
1514         goto out;
1515 }
1516
1517 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1518                                 unsigned long arg)
1519 {
1520         void __user *argp = compat_ptr(arg);
1521         struct sock *sk = sock->sk;
1522
1523         int rc = -ENOIOCTLCMD;
1524
1525         switch(cmd) {
1526         case TIOCOUTQ:
1527         case TIOCINQ:
1528                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1529                 break;
1530         case SIOCGSTAMP:
1531                 rc = -EINVAL;
1532                 if (sk)
1533                         rc = compat_sock_get_timestamp(sk,
1534                                         (struct timeval __user*)argp);
1535                 break;
1536         case SIOCGSTAMPNS:
1537                 rc = -EINVAL;
1538                 if (sk)
1539                         rc = compat_sock_get_timestampns(sk,
1540                                         (struct timespec __user*)argp);
1541                 break;
1542         case SIOCGIFADDR:
1543         case SIOCSIFADDR:
1544         case SIOCGIFDSTADDR:
1545         case SIOCSIFDSTADDR:
1546         case SIOCGIFBRDADDR:
1547         case SIOCSIFBRDADDR:
1548         case SIOCGIFNETMASK:
1549         case SIOCSIFNETMASK:
1550         case SIOCGIFMETRIC:
1551         case SIOCSIFMETRIC:
1552                 rc = -EINVAL;
1553                 break;
1554         case SIOCADDRT:
1555         case SIOCDELRT:
1556                 rc = -EPERM;
1557                 if (!capable(CAP_NET_ADMIN))
1558                         break;
1559                 rc = x25_route_ioctl(cmd, argp);
1560                 break;
1561         case SIOCX25GSUBSCRIP:
1562                 rc = compat_x25_subscr_ioctl(cmd, argp);
1563                 break;
1564         case SIOCX25SSUBSCRIP:
1565                 rc = -EPERM;
1566                 if (!capable(CAP_NET_ADMIN))
1567                         break;
1568                 rc = compat_x25_subscr_ioctl(cmd, argp);
1569                 break;
1570         case SIOCX25GFACILITIES:
1571         case SIOCX25SFACILITIES:
1572         case SIOCX25GDTEFACILITIES:
1573         case SIOCX25SDTEFACILITIES:
1574         case SIOCX25GCALLUSERDATA:
1575         case SIOCX25SCALLUSERDATA:
1576         case SIOCX25GCAUSEDIAG:
1577         case SIOCX25SCUDMATCHLEN:
1578         case SIOCX25CALLACCPTAPPRV:
1579         case SIOCX25SENDCALLACCPT:
1580                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1581                 break;
1582         default:
1583                 rc = -ENOIOCTLCMD;
1584                 break;
1585         }
1586         return rc;
1587 }
1588 #endif
1589
1590 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1591         .family =       AF_X25,
1592         .owner =        THIS_MODULE,
1593         .release =      x25_release,
1594         .bind =         x25_bind,
1595         .connect =      x25_connect,
1596         .socketpair =   sock_no_socketpair,
1597         .accept =       x25_accept,
1598         .getname =      x25_getname,
1599         .poll =         datagram_poll,
1600         .ioctl =        x25_ioctl,
1601 #ifdef CONFIG_COMPAT
1602         .compat_ioctl = compat_x25_ioctl,
1603 #endif
1604         .listen =       x25_listen,
1605         .shutdown =     sock_no_shutdown,
1606         .setsockopt =   x25_setsockopt,
1607         .getsockopt =   x25_getsockopt,
1608         .sendmsg =      x25_sendmsg,
1609         .recvmsg =      x25_recvmsg,
1610         .mmap =         sock_no_mmap,
1611         .sendpage =     sock_no_sendpage,
1612 };
1613
1614 SOCKOPS_WRAP(x25_proto, AF_X25);
1615
1616 static struct packet_type x25_packet_type = {
1617         .type = __constant_htons(ETH_P_X25),
1618         .func = x25_lapb_receive_frame,
1619 };
1620
1621 static struct notifier_block x25_dev_notifier = {
1622         .notifier_call = x25_device_event,
1623 };
1624
1625 void x25_kill_by_neigh(struct x25_neigh *nb)
1626 {
1627         struct sock *s;
1628         struct hlist_node *node;
1629
1630         write_lock_bh(&x25_list_lock);
1631
1632         sk_for_each(s, node, &x25_list)
1633                 if (x25_sk(s)->neighbour == nb)
1634                         x25_disconnect(s, ENETUNREACH, 0, 0);
1635
1636         write_unlock_bh(&x25_list_lock);
1637
1638         /* Remove any related forwards */
1639         x25_clear_forward_by_dev(nb->dev);
1640 }
1641
1642 static int __init x25_init(void)
1643 {
1644         int rc = proto_register(&x25_proto, 0);
1645
1646         if (rc != 0)
1647                 goto out;
1648
1649         sock_register(&x25_family_ops);
1650
1651         dev_add_pack(&x25_packet_type);
1652
1653         register_netdevice_notifier(&x25_dev_notifier);
1654
1655         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1656
1657 #ifdef CONFIG_SYSCTL
1658         x25_register_sysctl();
1659 #endif
1660         x25_proc_init();
1661 out:
1662         return rc;
1663 }
1664 module_init(x25_init);
1665
1666 static void __exit x25_exit(void)
1667 {
1668         x25_proc_exit();
1669         x25_link_free();
1670         x25_route_free();
1671
1672 #ifdef CONFIG_SYSCTL
1673         x25_unregister_sysctl();
1674 #endif
1675
1676         unregister_netdevice_notifier(&x25_dev_notifier);
1677
1678         dev_remove_pack(&x25_packet_type);
1679
1680         sock_unregister(AF_X25);
1681         proto_unregister(&x25_proto);
1682 }
1683 module_exit(x25_exit);
1684
1685 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1686 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1687 MODULE_LICENSE("GPL");
1688 MODULE_ALIAS_NETPROTO(PF_X25);