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   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/smp_lock.h>
  44 #include <linux/timer.h>
  45 #include <linux/string.h>
  46 #include <linux/net.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/skbuff.h>
  50 #include <linux/slab.h>
  51 #include <net/sock.h>
  52 #include <net/tcp_states.h>
  53 #include <asm/uaccess.h>
  54 #include <linux/fcntl.h>
  55 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  56 #include <linux/notifier.h>
  57 #include <linux/init.h>
  58 #include <linux/compat.h>
  59 #include <linux/ctype.h>
  60
  61 #include <net/x25.h>
  62 #include <net/compat.h>
  63
  64 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  65 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  66 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  67 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  68 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  69 int sysctl_x25_forward                 = 0;
  70
  71 HLIST_HEAD(x25_list);
  72 DEFINE_RWLOCK(x25_list_lock);
  73
  74 static const struct proto_ops x25_proto_ops;
  75
  76 static struct x25_address null_x25_address = {"               "};
  77
  78 #ifdef CONFIG_COMPAT
  79 struct compat_x25_subscrip_struct {
  80         char device[200-sizeof(compat_ulong_t)];
  81         compat_ulong_t global_facil_mask;
  82         compat_uint_t extended;
  83 };
  84 #endif
  85
  86 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  87                   struct x25_address *calling_addr)
  88 {
  89         unsigned int called_len, calling_len;
  90         char *called, *calling;
  91         unsigned int i;
  92
  93         called_len  = (*p >> 0) & 0x0F;
  94         calling_len = (*p >> 4) & 0x0F;
  95
  96         called  = called_addr->x25_addr;
  97         calling = calling_addr->x25_addr;
  98         p++;
  99
 100         for (i = 0; i < (called_len + calling_len); i++) {
 101                 if (i < called_len) {
 102                         if (i % 2 != 0) {
 103                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 104                                 p++;
 105                         } else {
 106                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 107                         }
 108                 } else {
 109                         if (i % 2 != 0) {
 110                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 111                                 p++;
 112                         } else {
 113                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 114                         }
 115                 }
 116         }
 117
 118         *called = *calling = '\0';
 119
 120         return 1 + (called_len + calling_len + 1) / 2;
 121 }
 122
 123 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 124                   struct x25_address *calling_addr)
 125 {
 126         unsigned int called_len, calling_len;
 127         char *called, *calling;
 128         int i;
 129
 130         called  = called_addr->x25_addr;
 131         calling = calling_addr->x25_addr;
 132
 133         called_len  = strlen(called);
 134         calling_len = strlen(calling);
 135
 136         *p++ = (calling_len << 4) | (called_len << 0);
 137
 138         for (i = 0; i < (called_len + calling_len); i++) {
 139                 if (i < called_len) {
 140                         if (i % 2 != 0) {
 141                                 *p |= (*called++ - '0') << 0;
 142                                 p++;
 143                         } else {
 144                                 *p = 0x00;
 145                                 *p |= (*called++ - '0') << 4;
 146                         }
 147                 } else {
 148                         if (i % 2 != 0) {
 149                                 *p |= (*calling++ - '0') << 0;
 150                                 p++;
 151                         } else {
 152                                 *p = 0x00;
 153                                 *p |= (*calling++ - '0') << 4;
 154                         }
 155                 }
 156         }
 157
 158         return 1 + (called_len + calling_len + 1) / 2;
 159 }
 160
 161 /*
 162  *      Socket removal during an interrupt is now safe.
 163  */
 164 static void x25_remove_socket(struct sock *sk)
 165 {
 166         write_lock_bh(&x25_list_lock);
 167         sk_del_node_init(sk);
 168         write_unlock_bh(&x25_list_lock);
 169 }
 170
 171 /*
 172  *      Kill all bound sockets on a dropped device.
 173  */
 174 static void x25_kill_by_device(struct net_device *dev)
 175 {
 176         struct sock *s;
 177         struct hlist_node *node;
 178
 179         write_lock_bh(&x25_list_lock);
 180
 181         sk_for_each(s, node, &x25_list)
 182                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 183                         x25_disconnect(s, ENETUNREACH, 0, 0);
 184
 185         write_unlock_bh(&x25_list_lock);
 186 }
 187
 188 /*
 189  *      Handle device status changes.
 190  */
 191 static int x25_device_event(struct notifier_block *this, unsigned long event,
 192                             void *ptr)
 193 {
 194         struct net_device *dev = ptr;
 195         struct x25_neigh *nb;
 196
 197         if (!net_eq(dev_net(dev), &init_net))
 198                 return NOTIFY_DONE;
 199
 200         if (dev->type == ARPHRD_X25
 201 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 202          || dev->type == ARPHRD_ETHER
 203 #endif
 204          ) {
 205                 switch (event) {
 206                         case NETDEV_UP:
 207                                 x25_link_device_up(dev);
 208                                 break;
 209                         case NETDEV_GOING_DOWN:
 210                                 nb = x25_get_neigh(dev);
 211                                 if (nb) {
 212                                         x25_terminate_link(nb);
 213                                         x25_neigh_put(nb);
 214                                 }
 215                                 break;
 216                         case NETDEV_DOWN:
 217                                 x25_kill_by_device(dev);
 218                                 x25_route_device_down(dev);
 219                                 x25_link_device_down(dev);
 220                                 break;
 221                 }
 222         }
 223
 224         return NOTIFY_DONE;
 225 }
 226
 227 /*
 228  *      Add a socket to the bound sockets list.
 229  */
 230 static void x25_insert_socket(struct sock *sk)
 231 {
 232         write_lock_bh(&x25_list_lock);
 233         sk_add_node(sk, &x25_list);
 234         write_unlock_bh(&x25_list_lock);
 235 }
 236
 237 /*
 238  *      Find a socket that wants to accept the Call Request we just
 239  *      received. Check the full list for an address/cud match.
 240  *      If no cuds match return the next_best thing, an address match.
 241  *      Note: if a listening socket has cud set it must only get calls
 242  *      with matching cud.
 243  */
 244 static struct sock *x25_find_listener(struct x25_address *addr,
 245                                         struct sk_buff *skb)
 246 {
 247         struct sock *s;
 248         struct sock *next_best;
 249         struct hlist_node *node;
 250
 251         read_lock_bh(&x25_list_lock);
 252         next_best = NULL;
 253
 254         sk_for_each(s, node, &x25_list)
 255                 if ((!strcmp(addr->x25_addr,
 256                         x25_sk(s)->source_addr.x25_addr) ||
 257                                 !strcmp(addr->x25_addr,
 258                                         null_x25_address.x25_addr)) &&
 259                                         s->sk_state == TCP_LISTEN) {
 260                         /*
 261                          * Found a listening socket, now check the incoming
 262                          * call user data vs this sockets call user data
 263                          */
 264                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 265                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 266                                         skb->data,
 267                                         x25_sk(s)->cudmatchlength)) == 0) {
 268                                         sock_hold(s);
 269                                         goto found;
 270                                  }
 271                         } else
 272                                 next_best = s;
 273                 }
 274         if (next_best) {
 275                 s = next_best;
 276                 sock_hold(s);
 277                 goto found;
 278         }
 279         s = NULL;
 280 found:
 281         read_unlock_bh(&x25_list_lock);
 282         return s;
 283 }
 284
 285 /*
 286  *      Find a connected X.25 socket given my LCI and neighbour.
 287  */
 288 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 289 {
 290         struct sock *s;
 291         struct hlist_node *node;
 292
 293         sk_for_each(s, node, &x25_list)
 294                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 295                         sock_hold(s);
 296                         goto found;
 297                 }
 298         s = NULL;
 299 found:
 300         return s;
 301 }
 302
 303 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 304 {
 305         struct sock *s;
 306
 307         read_lock_bh(&x25_list_lock);
 308         s = __x25_find_socket(lci, nb);
 309         read_unlock_bh(&x25_list_lock);
 310         return s;
 311 }
 312
 313 /*
 314  *      Find a unique LCI for a given device.
 315  */
 316 static unsigned int x25_new_lci(struct x25_neigh *nb)
 317 {
 318         unsigned int lci = 1;
 319         struct sock *sk;
 320
 321         read_lock_bh(&x25_list_lock);
 322
 323         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 324                 sock_put(sk);
 325                 if (++lci == 4096) {
 326                         lci = 0;
 327                         break;
 328                 }
 329         }
 330
 331         read_unlock_bh(&x25_list_lock);
 332         return lci;
 333 }
 334
 335 /*
 336  *      Deferred destroy.
 337  */
 338 static void __x25_destroy_socket(struct sock *);
 339
 340 /*
 341  *      handler for deferred kills.
 342  */
 343 static void x25_destroy_timer(unsigned long data)
 344 {
 345         x25_destroy_socket_from_timer((struct sock *)data);
 346 }
 347
 348 /*
 349  *      This is called from user mode and the timers. Thus it protects itself
 350  *      against interrupt users but doesn't worry about being called during
 351  *      work. Once it is removed from the queue no interrupt or bottom half
 352  *      will touch it and we are (fairly 8-) ) safe.
 353  *      Not static as it's used by the timer
 354  */
 355 static void __x25_destroy_socket(struct sock *sk)
 356 {
 357         struct sk_buff *skb;
 358
 359         x25_stop_heartbeat(sk);
 360         x25_stop_timer(sk);
 361
 362         x25_remove_socket(sk);
 363         x25_clear_queues(sk);           /* Flush the queues */
 364
 365         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 366                 if (skb->sk != sk) {            /* A pending connection */
 367                         /*
 368                          * Queue the unaccepted socket for death
 369                          */
 370                         sock_set_flag(skb->sk, SOCK_DEAD);
 371                         x25_start_heartbeat(skb->sk);
 372                         x25_sk(skb->sk)->state = X25_STATE_0;
 373                 }
 374
 375                 kfree_skb(skb);
 376         }
 377
 378         if (sk_has_allocations(sk)) {
 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
 390 void x25_destroy_socket_from_timer(struct sock *sk)
 391 {
 392         sock_hold(sk);
 393         bh_lock_sock(sk);
 394         __x25_destroy_socket(sk);
 395         bh_unlock_sock(sk);
 396         sock_put(sk);
 397 }
 398
 399 static void x25_destroy_socket(struct sock *sk)
 400 {
 401         sock_hold(sk);
 402         lock_sock(sk);
 403         __x25_destroy_socket(sk);
 404         release_sock(sk);
 405         sock_put(sk);
 406 }
 407
 408 /*
 409  *      Handling for system calls applied via the various interfaces to a
 410  *      X.25 socket object.
 411  */
 412
 413 static int x25_setsockopt(struct socket *sock, int level, int optname,
 414                           char __user *optval, unsigned int optlen)
 415 {
 416         int opt;
 417         struct sock *sk = sock->sk;
 418         int rc = -ENOPROTOOPT;
 419
 420         lock_kernel();
 421         if (level != SOL_X25 || optname != X25_QBITINCL)
 422                 goto out;
 423
 424         rc = -EINVAL;
 425         if (optlen < sizeof(int))
 426                 goto out;
 427
 428         rc = -EFAULT;
 429         if (get_user(opt, (int __user *)optval))
 430                 goto out;
 431
 432         x25_sk(sk)->qbitincl = !!opt;
 433         rc = 0;
 434 out:
 435         unlock_kernel();
 436         return rc;
 437 }
 438
 439 static int x25_getsockopt(struct socket *sock, int level, int optname,
 440                           char __user *optval, int __user *optlen)
 441 {
 442         struct sock *sk = sock->sk;
 443         int val, len, rc = -ENOPROTOOPT;
 444
 445         lock_kernel();
 446         if (level != SOL_X25 || optname != X25_QBITINCL)
 447                 goto out;
 448
 449         rc = -EFAULT;
 450         if (get_user(len, optlen))
 451                 goto out;
 452
 453         len = min_t(unsigned int, len, sizeof(int));
 454
 455         rc = -EINVAL;
 456         if (len < 0)
 457                 goto out;
 458
 459         rc = -EFAULT;
 460         if (put_user(len, optlen))
 461                 goto out;
 462
 463         val = x25_sk(sk)->qbitincl;
 464         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 465 out:
 466         unlock_kernel();
 467         return rc;
 468 }
 469
 470 static int x25_listen(struct socket *sock, int backlog)
 471 {
 472         struct sock *sk = sock->sk;
 473         int rc = -EOPNOTSUPP;
 474
 475         lock_kernel();
 476         if (sk->sk_state != TCP_LISTEN) {
 477                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 478                 sk->sk_max_ack_backlog = backlog;
 479                 sk->sk_state           = TCP_LISTEN;
 480                 rc = 0;
 481         }
 482         unlock_kernel();
 483
 484         return rc;
 485 }
 486
 487 static struct proto x25_proto = {
 488         .name     = "X25",
 489         .owner    = THIS_MODULE,
 490         .obj_size = sizeof(struct x25_sock),
 491 };
 492
 493 static struct sock *x25_alloc_socket(struct net *net)
 494 {
 495         struct x25_sock *x25;
 496         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 497
 498         if (!sk)
 499                 goto out;
 500
 501         sock_init_data(NULL, sk);
 502
 503         x25 = x25_sk(sk);
 504         skb_queue_head_init(&x25->ack_queue);
 505         skb_queue_head_init(&x25->fragment_queue);
 506         skb_queue_head_init(&x25->interrupt_in_queue);
 507         skb_queue_head_init(&x25->interrupt_out_queue);
 508 out:
 509         return sk;
 510 }
 511
 512 static int x25_create(struct net *net, struct socket *sock, int protocol,
 513                       int kern)
 514 {
 515         struct sock *sk;
 516         struct x25_sock *x25;
 517         int rc = -EAFNOSUPPORT;
 518
 519         if (!net_eq(net, &init_net))
 520                 goto out;
 521
 522         rc = -ESOCKTNOSUPPORT;
 523         if (sock->type != SOCK_SEQPACKET)
 524                 goto out;
 525
 526         rc = -EINVAL;
 527         if (protocol)
 528                 goto out;
 529
 530         rc = -ENOBUFS;
 531         if ((sk = x25_alloc_socket(net)) == NULL)
 532                 goto out;
 533
 534         x25 = x25_sk(sk);
 535
 536         sock_init_data(sock, sk);
 537
 538         x25_init_timers(sk);
 539
 540         sock->ops    = &x25_proto_ops;
 541         sk->sk_protocol = protocol;
 542         sk->sk_backlog_rcv = x25_backlog_rcv;
 543
 544         x25->t21   = sysctl_x25_call_request_timeout;
 545         x25->t22   = sysctl_x25_reset_request_timeout;
 546         x25->t23   = sysctl_x25_clear_request_timeout;
 547         x25->t2    = sysctl_x25_ack_holdback_timeout;
 548         x25->state = X25_STATE_0;
 549         x25->cudmatchlength = 0;
 550         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 551                                                         /* on call accept   */
 552
 553         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 554         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 555         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 556         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 557         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 558         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 559         x25->dte_facilities.calling_len = 0;
 560         x25->dte_facilities.called_len = 0;
 561         memset(x25->dte_facilities.called_ae, '\0',
 562                         sizeof(x25->dte_facilities.called_ae));
 563         memset(x25->dte_facilities.calling_ae, '\0',
 564                         sizeof(x25->dte_facilities.calling_ae));
 565
 566         rc = 0;
 567 out:
 568         return rc;
 569 }
 570
 571 static struct sock *x25_make_new(struct sock *osk)
 572 {
 573         struct sock *sk = NULL;
 574         struct x25_sock *x25, *ox25;
 575
 576         if (osk->sk_type != SOCK_SEQPACKET)
 577                 goto out;
 578
 579         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 580                 goto out;
 581
 582         x25 = x25_sk(sk);
 583
 584         sk->sk_type        = osk->sk_type;
 585         sk->sk_priority    = osk->sk_priority;
 586         sk->sk_protocol    = osk->sk_protocol;
 587         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 588         sk->sk_sndbuf      = osk->sk_sndbuf;
 589         sk->sk_state       = TCP_ESTABLISHED;
 590         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 591         sock_copy_flags(sk, osk);
 592
 593         ox25 = x25_sk(osk);
 594         x25->t21        = ox25->t21;
 595         x25->t22        = ox25->t22;
 596         x25->t23        = ox25->t23;
 597         x25->t2         = ox25->t2;
 598         x25->facilities = ox25->facilities;
 599         x25->qbitincl   = ox25->qbitincl;
 600         x25->dte_facilities = ox25->dte_facilities;
 601         x25->cudmatchlength = ox25->cudmatchlength;
 602         x25->accptapprv = ox25->accptapprv;
 603
 604         x25_init_timers(sk);
 605 out:
 606         return sk;
 607 }
 608
 609 static int x25_release(struct socket *sock)
 610 {
 611         struct sock *sk = sock->sk;
 612         struct x25_sock *x25;
 613
 614         lock_kernel();
 615         if (!sk)
 616                 goto out;
 617
 618         x25 = x25_sk(sk);
 619
 620         switch (x25->state) {
 621
 622                 case X25_STATE_0:
 623                 case X25_STATE_2:
 624                         x25_disconnect(sk, 0, 0, 0);
 625                         x25_destroy_socket(sk);
 626                         goto out;
 627
 628                 case X25_STATE_1:
 629                 case X25_STATE_3:
 630                 case X25_STATE_4:
 631                         x25_clear_queues(sk);
 632                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 633                         x25_start_t23timer(sk);
 634                         x25->state = X25_STATE_2;
 635                         sk->sk_state    = TCP_CLOSE;
 636                         sk->sk_shutdown |= SEND_SHUTDOWN;
 637                         sk->sk_state_change(sk);
 638                         sock_set_flag(sk, SOCK_DEAD);
 639                         sock_set_flag(sk, SOCK_DESTROY);
 640                         break;
 641         }
 642
 643         sock_orphan(sk);
 644 out:
 645         unlock_kernel();
 646         return 0;
 647 }
 648
 649 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 650 {
 651         struct sock *sk = sock->sk;
 652         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 653         int len, i, rc = 0;
 654
 655         lock_kernel();
 656         if (!sock_flag(sk, SOCK_ZAPPED) ||
 657             addr_len != sizeof(struct sockaddr_x25) ||
 658             addr->sx25_family != AF_X25) {
 659                 rc = -EINVAL;
 660                 goto out;
 661         }
 662
 663         len = strlen(addr->sx25_addr.x25_addr);
 664         for (i = 0; i < len; i++) {
 665                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 666                         rc = -EINVAL;
 667                         goto out;
 668                 }
 669         }
 670
 671         x25_sk(sk)->source_addr = addr->sx25_addr;
 672         x25_insert_socket(sk);
 673         sock_reset_flag(sk, SOCK_ZAPPED);
 674         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 675 out:
 676         unlock_kernel();
 677         return rc;
 678 }
 679
 680 static int x25_wait_for_connection_establishment(struct sock *sk)
 681 {
 682         DECLARE_WAITQUEUE(wait, current);
 683         int rc;
 684
 685         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 686         for (;;) {
 687                 __set_current_state(TASK_INTERRUPTIBLE);
 688                 rc = -ERESTARTSYS;
 689                 if (signal_pending(current))
 690                         break;
 691                 rc = sock_error(sk);
 692                 if (rc) {
 693                         sk->sk_socket->state = SS_UNCONNECTED;
 694                         break;
 695                 }
 696                 rc = 0;
 697                 if (sk->sk_state != TCP_ESTABLISHED) {
 698                         release_sock(sk);
 699                         schedule();
 700                         lock_sock(sk);
 701                 } else
 702                         break;
 703         }
 704         __set_current_state(TASK_RUNNING);
 705         remove_wait_queue(sk->sk_sleep, &wait);
 706         return rc;
 707 }
 708
 709 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 710                        int addr_len, int flags)
 711 {
 712         struct sock *sk = sock->sk;
 713         struct x25_sock *x25 = x25_sk(sk);
 714         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 715         struct x25_route *rt;
 716         int rc = 0;
 717
 718         lock_kernel();
 719         lock_sock(sk);
 720         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 721                 sock->state = SS_CONNECTED;
 722                 goto out; /* Connect completed during a ERESTARTSYS event */
 723         }
 724
 725         rc = -ECONNREFUSED;
 726         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 727                 sock->state = SS_UNCONNECTED;
 728                 goto out;
 729         }
 730
 731         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 732         if (sk->sk_state == TCP_ESTABLISHED)
 733                 goto out;
 734
 735         sk->sk_state   = TCP_CLOSE;
 736         sock->state = SS_UNCONNECTED;
 737
 738         rc = -EINVAL;
 739         if (addr_len != sizeof(struct sockaddr_x25) ||
 740             addr->sx25_family != AF_X25)
 741                 goto out;
 742
 743         rc = -ENETUNREACH;
 744         rt = x25_get_route(&addr->sx25_addr);
 745         if (!rt)
 746                 goto out;
 747
 748         x25->neighbour = x25_get_neigh(rt->dev);
 749         if (!x25->neighbour)
 750                 goto out_put_route;
 751
 752         x25_limit_facilities(&x25->facilities, x25->neighbour);
 753
 754         x25->lci = x25_new_lci(x25->neighbour);
 755         if (!x25->lci)
 756                 goto out_put_neigh;
 757
 758         rc = -EINVAL;
 759         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 760                 goto out_put_neigh;
 761
 762         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 763                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 764
 765         x25->dest_addr = addr->sx25_addr;
 766
 767         /* Move to connecting socket, start sending Connect Requests */
 768         sock->state   = SS_CONNECTING;
 769         sk->sk_state  = TCP_SYN_SENT;
 770
 771         x25->state = X25_STATE_1;
 772
 773         x25_write_internal(sk, X25_CALL_REQUEST);
 774
 775         x25_start_heartbeat(sk);
 776         x25_start_t21timer(sk);
 777
 778         /* Now the loop */
 779         rc = -EINPROGRESS;
 780         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 781                 goto out_put_neigh;
 782
 783         rc = x25_wait_for_connection_establishment(sk);
 784         if (rc)
 785                 goto out_put_neigh;
 786
 787         sock->state = SS_CONNECTED;
 788         rc = 0;
 789 out_put_neigh:
 790         if (rc)
 791                 x25_neigh_put(x25->neighbour);
 792 out_put_route:
 793         x25_route_put(rt);
 794 out:
 795         release_sock(sk);
 796         unlock_kernel();
 797         return rc;
 798 }
 799
 800 static int x25_wait_for_data(struct sock *sk, long timeout)
 801 {
 802         DECLARE_WAITQUEUE(wait, current);
 803         int rc = 0;
 804
 805         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 806         for (;;) {
 807                 __set_current_state(TASK_INTERRUPTIBLE);
 808                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 809                         break;
 810                 rc = -ERESTARTSYS;
 811                 if (signal_pending(current))
 812                         break;
 813                 rc = -EAGAIN;
 814                 if (!timeout)
 815                         break;
 816                 rc = 0;
 817                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 818                         release_sock(sk);
 819                         timeout = schedule_timeout(timeout);
 820                         lock_sock(sk);
 821                 } else
 822                         break;
 823         }
 824         __set_current_state(TASK_RUNNING);
 825         remove_wait_queue(sk->sk_sleep, &wait);
 826         return rc;
 827 }
 828
 829 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 830 {
 831         struct sock *sk = sock->sk;
 832         struct sock *newsk;
 833         struct sk_buff *skb;
 834         int rc = -EINVAL;
 835
 836         lock_kernel();
 837         if (!sk || sk->sk_state != TCP_LISTEN)
 838                 goto out;
 839
 840         rc = -EOPNOTSUPP;
 841         if (sk->sk_type != SOCK_SEQPACKET)
 842                 goto out;
 843
 844         lock_sock(sk);
 845         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 846         if (rc)
 847                 goto out2;
 848         skb = skb_dequeue(&sk->sk_receive_queue);
 849         rc = -EINVAL;
 850         if (!skb->sk)
 851                 goto out2;
 852         newsk            = skb->sk;
 853         sock_graft(newsk, newsock);
 854
 855         /* Now attach up the new socket */
 856         skb->sk = NULL;
 857         kfree_skb(skb);
 858         sk->sk_ack_backlog--;
 859         newsock->state = SS_CONNECTED;
 860         rc = 0;
 861 out2:
 862         release_sock(sk);
 863 out:
 864         unlock_kernel();
 865         return rc;
 866 }
 867
 868 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 869                        int *uaddr_len, int peer)
 870 {
 871         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 872         struct sock *sk = sock->sk;
 873         struct x25_sock *x25 = x25_sk(sk);
 874         int rc = 0;
 875
 876         lock_kernel();
 877         if (peer) {
 878                 if (sk->sk_state != TCP_ESTABLISHED) {
 879                         rc = -ENOTCONN;
 880                         goto out;
 881                 }
 882                 sx25->sx25_addr = x25->dest_addr;
 883         } else
 884                 sx25->sx25_addr = x25->source_addr;
 885
 886         sx25->sx25_family = AF_X25;
 887         *uaddr_len = sizeof(*sx25);
 888
 889 out:
 890         unlock_kernel();
 891         return rc;
 892 }
 893
 894 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
 895                            poll_table *wait)
 896 {
 897         int rc;
 898
 899         lock_kernel();
 900         rc = datagram_poll(file, sock, wait);
 901         unlock_kernel();
 902
 903         return rc;
 904 }
 905
 906 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 907                         unsigned int lci)
 908 {
 909         struct sock *sk;
 910         struct sock *make;
 911         struct x25_sock *makex25;
 912         struct x25_address source_addr, dest_addr;
 913         struct x25_facilities facilities;
 914         struct x25_dte_facilities dte_facilities;
 915         int len, addr_len, rc;
 916
 917         /*
 918          *      Remove the LCI and frame type.
 919          */
 920         skb_pull(skb, X25_STD_MIN_LEN);
 921
 922         /*
 923          *      Extract the X.25 addresses and convert them to ASCII strings,
 924          *      and remove them.
 925          */
 926         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 927         skb_pull(skb, addr_len);
 928
 929         /*
 930          *      Get the length of the facilities, skip past them for the moment
 931          *      get the call user data because this is needed to determine
 932          *      the correct listener
 933          */
 934         len = skb->data[0] + 1;
 935         skb_pull(skb,len);
 936
 937         /*
 938          *      Find a listener for the particular address/cud pair.
 939          */
 940         sk = x25_find_listener(&source_addr,skb);
 941         skb_push(skb,len);
 942
 943         if (sk != NULL && sk_acceptq_is_full(sk)) {
 944                 goto out_sock_put;
 945         }
 946
 947         /*
 948          *      We dont have any listeners for this incoming call.
 949          *      Try forwarding it.
 950          */
 951         if (sk == NULL) {
 952                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 953                 if (sysctl_x25_forward &&
 954                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 955                 {
 956                         /* Call was forwarded, dont process it any more */
 957                         kfree_skb(skb);
 958                         rc = 1;
 959                         goto out;
 960                 } else {
 961                         /* No listeners, can't forward, clear the call */
 962                         goto out_clear_request;
 963                 }
 964         }
 965
 966         /*
 967          *      Try to reach a compromise on the requested facilities.
 968          */
 969         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 970         if (len == -1)
 971                 goto out_sock_put;
 972
 973         /*
 974          * current neighbour/link might impose additional limits
 975          * on certain facilties
 976          */
 977
 978         x25_limit_facilities(&facilities, nb);
 979
 980         /*
 981          *      Try to create a new socket.
 982          */
 983         make = x25_make_new(sk);
 984         if (!make)
 985                 goto out_sock_put;
 986
 987         /*
 988          *      Remove the facilities
 989          */
 990         skb_pull(skb, len);
 991
 992         skb->sk     = make;
 993         make->sk_state = TCP_ESTABLISHED;
 994
 995         makex25 = x25_sk(make);
 996         makex25->lci           = lci;
 997         makex25->dest_addr     = dest_addr;
 998         makex25->source_addr   = source_addr;
 999         makex25->neighbour     = nb;
1000         makex25->facilities    = facilities;
1001         makex25->dte_facilities= dte_facilities;
1002         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1003         /* ensure no reverse facil on accept */
1004         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1005         /* ensure no calling address extension on accept */
1006         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1007         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1008
1009         /* Normally all calls are accepted immediatly */
1010         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
1011                 x25_write_internal(make, X25_CALL_ACCEPTED);
1012                 makex25->state = X25_STATE_3;
1013         }
1014
1015         /*
1016          *      Incoming Call User Data.
1017          */
1018         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1019         makex25->calluserdata.cudlength = skb->len;
1020
1021         sk->sk_ack_backlog++;
1022
1023         x25_insert_socket(make);
1024
1025         skb_queue_head(&sk->sk_receive_queue, skb);
1026
1027         x25_start_heartbeat(make);
1028
1029         if (!sock_flag(sk, SOCK_DEAD))
1030                 sk->sk_data_ready(sk, skb->len);
1031         rc = 1;
1032         sock_put(sk);
1033 out:
1034         return rc;
1035 out_sock_put:
1036         sock_put(sk);
1037 out_clear_request:
1038         rc = 0;
1039         x25_transmit_clear_request(nb, lci, 0x01);
1040         goto out;
1041 }
1042
1043 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1044                        struct msghdr *msg, size_t len)
1045 {
1046         struct sock *sk = sock->sk;
1047         struct x25_sock *x25 = x25_sk(sk);
1048         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1049         struct sockaddr_x25 sx25;
1050         struct sk_buff *skb;
1051         unsigned char *asmptr;
1052         int noblock = msg->msg_flags & MSG_DONTWAIT;
1053         size_t size;
1054         int qbit = 0, rc = -EINVAL;
1055
1056         lock_kernel();
1057         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1058                 goto out;
1059
1060         /* we currently don't support segmented records at the user interface */
1061         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1062                 goto out;
1063
1064         rc = -EADDRNOTAVAIL;
1065         if (sock_flag(sk, SOCK_ZAPPED))
1066                 goto out;
1067
1068         rc = -EPIPE;
1069         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1070                 send_sig(SIGPIPE, current, 0);
1071                 goto out;
1072         }
1073
1074         rc = -ENETUNREACH;
1075         if (!x25->neighbour)
1076                 goto out;
1077
1078         if (usx25) {
1079                 rc = -EINVAL;
1080                 if (msg->msg_namelen < sizeof(sx25))
1081                         goto out;
1082                 memcpy(&sx25, usx25, sizeof(sx25));
1083                 rc = -EISCONN;
1084                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1085                         goto out;
1086                 rc = -EINVAL;
1087                 if (sx25.sx25_family != AF_X25)
1088                         goto out;
1089         } else {
1090                 /*
1091                  *      FIXME 1003.1g - if the socket is like this because
1092                  *      it has become closed (not started closed) we ought
1093                  *      to SIGPIPE, EPIPE;
1094                  */
1095                 rc = -ENOTCONN;
1096                 if (sk->sk_state != TCP_ESTABLISHED)
1097                         goto out;
1098
1099                 sx25.sx25_family = AF_X25;
1100                 sx25.sx25_addr   = x25->dest_addr;
1101         }
1102
1103         /* Sanity check the packet size */
1104         if (len > 65535) {
1105                 rc = -EMSGSIZE;
1106                 goto out;
1107         }
1108
1109         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1110
1111         /* Build a packet */
1112         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1113
1114         if ((msg->msg_flags & MSG_OOB) && len > 32)
1115                 len = 32;
1116
1117         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1118
1119         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1120         if (!skb)
1121                 goto out;
1122         X25_SKB_CB(skb)->flags = msg->msg_flags;
1123
1124         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1125
1126         /*
1127          *      Put the data on the end
1128          */
1129         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1130
1131         skb_reset_transport_header(skb);
1132         skb_put(skb, len);
1133
1134         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1135         if (rc)
1136                 goto out_kfree_skb;
1137
1138         /*
1139          *      If the Q BIT Include socket option is in force, the first
1140          *      byte of the user data is the logical value of the Q Bit.
1141          */
1142         if (x25->qbitincl) {
1143                 qbit = skb->data[0];
1144                 skb_pull(skb, 1);
1145         }
1146
1147         /*
1148          *      Push down the X.25 header
1149          */
1150         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1151
1152         if (msg->msg_flags & MSG_OOB) {
1153                 if (x25->neighbour->extended) {
1154                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1155                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1156                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1157                         *asmptr++ = X25_INTERRUPT;
1158                 } else {
1159                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1160                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1161                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1162                         *asmptr++ = X25_INTERRUPT;
1163                 }
1164         } else {
1165                 if (x25->neighbour->extended) {
1166                         /* Build an Extended X.25 header */
1167                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1168                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1169                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1170                         *asmptr++ = X25_DATA;
1171                         *asmptr++ = X25_DATA;
1172                 } else {
1173                         /* Build an Standard X.25 header */
1174                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1175                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1176                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1177                         *asmptr++ = X25_DATA;
1178                 }
1179
1180                 if (qbit)
1181                         skb->data[0] |= X25_Q_BIT;
1182         }
1183
1184         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1185         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1186
1187         rc = -ENOTCONN;
1188         if (sk->sk_state != TCP_ESTABLISHED)
1189                 goto out_kfree_skb;
1190
1191         if (msg->msg_flags & MSG_OOB)
1192                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1193         else {
1194                 rc = x25_output(sk, skb);
1195                 len = rc;
1196                 if (rc < 0)
1197                         kfree_skb(skb);
1198                 else if (x25->qbitincl)
1199                         len++;
1200         }
1201
1202         /*
1203          * lock_sock() is currently only used to serialize this x25_kick()
1204          * against input-driven x25_kick() calls. It currently only blocks
1205          * incoming packets for this socket and does not protect against
1206          * any other socket state changes and is not called from anywhere
1207          * else. As x25_kick() cannot block and as long as all socket
1208          * operations are BKL-wrapped, we don't need take to care about
1209          * purging the backlog queue in x25_release().
1210          *
1211          * Using lock_sock() to protect all socket operations entirely
1212          * (and making the whole x25 stack SMP aware) unfortunately would
1213          * require major changes to {send,recv}msg and skb allocation methods.
1214          * -> 2.5 ;)
1215          */
1216         lock_sock(sk);
1217         x25_kick(sk);
1218         release_sock(sk);
1219         rc = len;
1220 out:
1221         unlock_kernel();
1222         return rc;
1223 out_kfree_skb:
1224         kfree_skb(skb);
1225         goto out;
1226 }
1227
1228
1229 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1230                        struct msghdr *msg, size_t size,
1231                        int flags)
1232 {
1233         struct sock *sk = sock->sk;
1234         struct x25_sock *x25 = x25_sk(sk);
1235         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1236         size_t copied;
1237         int qbit;
1238         struct sk_buff *skb;
1239         unsigned char *asmptr;
1240         int rc = -ENOTCONN;
1241
1242         lock_kernel();
1243         /*
1244          * This works for seqpacket too. The receiver has ordered the queue for
1245          * us! We do one quick check first though
1246          */
1247         if (sk->sk_state != TCP_ESTABLISHED)
1248                 goto out;
1249
1250         if (flags & MSG_OOB) {
1251                 rc = -EINVAL;
1252                 if (sock_flag(sk, SOCK_URGINLINE) ||
1253                     !skb_peek(&x25->interrupt_in_queue))
1254                         goto out;
1255
1256                 skb = skb_dequeue(&x25->interrupt_in_queue);
1257
1258                 skb_pull(skb, X25_STD_MIN_LEN);
1259
1260                 /*
1261                  *      No Q bit information on Interrupt data.
1262                  */
1263                 if (x25->qbitincl) {
1264                         asmptr  = skb_push(skb, 1);
1265                         *asmptr = 0x00;
1266                 }
1267
1268                 msg->msg_flags |= MSG_OOB;
1269         } else {
1270                 /* Now we can treat all alike */
1271                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1272                                         flags & MSG_DONTWAIT, &rc);
1273                 if (!skb)
1274                         goto out;
1275
1276                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1277
1278                 skb_pull(skb, x25->neighbour->extended ?
1279                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1280
1281                 if (x25->qbitincl) {
1282                         asmptr  = skb_push(skb, 1);
1283                         *asmptr = qbit;
1284                 }
1285         }
1286
1287         skb_reset_transport_header(skb);
1288         copied = skb->len;
1289
1290         if (copied > size) {
1291                 copied = size;
1292                 msg->msg_flags |= MSG_TRUNC;
1293         }
1294
1295         /* Currently, each datagram always contains a complete record */
1296         msg->msg_flags |= MSG_EOR;
1297
1298         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1299         if (rc)
1300                 goto out_free_dgram;
1301
1302         if (sx25) {
1303                 sx25->sx25_family = AF_X25;
1304                 sx25->sx25_addr   = x25->dest_addr;
1305         }
1306
1307         msg->msg_namelen = sizeof(struct sockaddr_x25);
1308
1309         lock_sock(sk);
1310         x25_check_rbuf(sk);
1311         release_sock(sk);
1312         rc = copied;
1313 out_free_dgram:
1314         skb_free_datagram(sk, skb);
1315 out:
1316         unlock_kernel();
1317         return rc;
1318 }
1319
1320
1321 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1322 {
1323         struct sock *sk = sock->sk;
1324         struct x25_sock *x25 = x25_sk(sk);
1325         void __user *argp = (void __user *)arg;
1326         int rc;
1327
1328         lock_kernel();
1329         switch (cmd) {
1330                 case TIOCOUTQ: {
1331                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1332
1333                         if (amount < 0)
1334                                 amount = 0;
1335                         rc = put_user(amount, (unsigned int __user *)argp);
1336                         break;
1337                 }
1338
1339                 case TIOCINQ: {
1340                         struct sk_buff *skb;
1341                         int amount = 0;
1342                         /*
1343                          * These two are safe on a single CPU system as
1344                          * only user tasks fiddle here
1345                          */
1346                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1347                                 amount = skb->len;
1348                         rc = put_user(amount, (unsigned int __user *)argp);
1349                         break;
1350                 }
1351
1352                 case SIOCGSTAMP:
1353                         rc = -EINVAL;
1354                         if (sk)
1355                                 rc = sock_get_timestamp(sk,
1356                                                 (struct timeval __user *)argp);
1357                         break;
1358                 case SIOCGSTAMPNS:
1359                         rc = -EINVAL;
1360                         if (sk)
1361                                 rc = sock_get_timestampns(sk,
1362                                                 (struct timespec __user *)argp);
1363                         break;
1364                 case SIOCGIFADDR:
1365                 case SIOCSIFADDR:
1366                 case SIOCGIFDSTADDR:
1367                 case SIOCSIFDSTADDR:
1368                 case SIOCGIFBRDADDR:
1369                 case SIOCSIFBRDADDR:
1370                 case SIOCGIFNETMASK:
1371                 case SIOCSIFNETMASK:
1372                 case SIOCGIFMETRIC:
1373                 case SIOCSIFMETRIC:
1374                         rc = -EINVAL;
1375                         break;
1376                 case SIOCADDRT:
1377                 case SIOCDELRT:
1378                         rc = -EPERM;
1379                         if (!capable(CAP_NET_ADMIN))
1380                                 break;
1381                         rc = x25_route_ioctl(cmd, argp);
1382                         break;
1383                 case SIOCX25GSUBSCRIP:
1384                         rc = x25_subscr_ioctl(cmd, argp);
1385                         break;
1386                 case SIOCX25SSUBSCRIP:
1387                         rc = -EPERM;
1388                         if (!capable(CAP_NET_ADMIN))
1389                                 break;
1390                         rc = x25_subscr_ioctl(cmd, argp);
1391                         break;
1392                 case SIOCX25GFACILITIES: {
1393                         struct x25_facilities fac = x25->facilities;
1394                         rc = copy_to_user(argp, &fac,
1395                                           sizeof(fac)) ? -EFAULT : 0;
1396                         break;
1397                 }
1398
1399                 case SIOCX25SFACILITIES: {
1400                         struct x25_facilities facilities;
1401                         rc = -EFAULT;
1402                         if (copy_from_user(&facilities, argp,
1403                                            sizeof(facilities)))
1404                                 break;
1405                         rc = -EINVAL;
1406                         if (sk->sk_state != TCP_LISTEN &&
1407                             sk->sk_state != TCP_CLOSE)
1408                                 break;
1409                         if (facilities.pacsize_in < X25_PS16 ||
1410                             facilities.pacsize_in > X25_PS4096)
1411                                 break;
1412                         if (facilities.pacsize_out < X25_PS16 ||
1413                             facilities.pacsize_out > X25_PS4096)
1414                                 break;
1415                         if (facilities.winsize_in < 1 ||
1416                             facilities.winsize_in > 127)
1417                                 break;
1418                         if (facilities.throughput < 0x03 ||
1419                             facilities.throughput > 0xDD)
1420                                 break;
1421                         if (facilities.reverse &&
1422                                 (facilities.reverse & 0x81) != 0x81)
1423                                 break;
1424                         x25->facilities = facilities;
1425                         rc = 0;
1426                         break;
1427                 }
1428
1429                 case SIOCX25GDTEFACILITIES: {
1430                         rc = copy_to_user(argp, &x25->dte_facilities,
1431                                                 sizeof(x25->dte_facilities));
1432                         if (rc)
1433                                 rc = -EFAULT;
1434                         break;
1435                 }
1436
1437                 case SIOCX25SDTEFACILITIES: {
1438                         struct x25_dte_facilities dtefacs;
1439                         rc = -EFAULT;
1440                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1441                                 break;
1442                         rc = -EINVAL;
1443                         if (sk->sk_state != TCP_LISTEN &&
1444                                         sk->sk_state != TCP_CLOSE)
1445                                 break;
1446                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1447                                 break;
1448                         if (dtefacs.calling_ae == NULL)
1449                                 break;
1450                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1451                                 break;
1452                         if (dtefacs.called_ae == NULL)
1453                                 break;
1454                         x25->dte_facilities = dtefacs;
1455                         rc = 0;
1456                         break;
1457                 }
1458
1459                 case SIOCX25GCALLUSERDATA: {
1460                         struct x25_calluserdata cud = x25->calluserdata;
1461                         rc = copy_to_user(argp, &cud,
1462                                           sizeof(cud)) ? -EFAULT : 0;
1463                         break;
1464                 }
1465
1466                 case SIOCX25SCALLUSERDATA: {
1467                         struct x25_calluserdata calluserdata;
1468
1469                         rc = -EFAULT;
1470                         if (copy_from_user(&calluserdata, argp,
1471                                            sizeof(calluserdata)))
1472                                 break;
1473                         rc = -EINVAL;
1474                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1475                                 break;
1476                         x25->calluserdata = calluserdata;
1477                         rc = 0;
1478                         break;
1479                 }
1480
1481                 case SIOCX25GCAUSEDIAG: {
1482                         struct x25_causediag causediag;
1483                         causediag = x25->causediag;
1484                         rc = copy_to_user(argp, &causediag,
1485                                           sizeof(causediag)) ? -EFAULT : 0;
1486                         break;
1487                 }
1488
1489                 case SIOCX25SCAUSEDIAG: {
1490                         struct x25_causediag causediag;
1491                         rc = -EFAULT;
1492                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1493                                 break;
1494                         x25->causediag = causediag;
1495                         rc = 0;
1496                         break;
1497
1498                 }
1499
1500                 case SIOCX25SCUDMATCHLEN: {
1501                         struct x25_subaddr sub_addr;
1502                         rc = -EINVAL;
1503                         if(sk->sk_state != TCP_CLOSE)
1504                                 break;
1505                         rc = -EFAULT;
1506                         if (copy_from_user(&sub_addr, argp,
1507                                         sizeof(sub_addr)))
1508                                 break;
1509                         rc = -EINVAL;
1510                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1511                                 break;
1512                         x25->cudmatchlength = sub_addr.cudmatchlength;
1513                         rc = 0;
1514                         break;
1515                 }
1516
1517                 case SIOCX25CALLACCPTAPPRV: {
1518                         rc = -EINVAL;
1519                         if (sk->sk_state != TCP_CLOSE)
1520                                 break;
1521                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1522                         rc = 0;
1523                         break;
1524                 }
1525
1526                 case SIOCX25SENDCALLACCPT:  {
1527                         rc = -EINVAL;
1528                         if (sk->sk_state != TCP_ESTABLISHED)
1529                                 break;
1530                         if (x25->accptapprv)    /* must call accptapprv above */
1531                                 break;
1532                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1533                         x25->state = X25_STATE_3;
1534                         rc = 0;
1535                         break;
1536                 }
1537
1538                 default:
1539                         rc = -ENOIOCTLCMD;
1540                         break;
1541         }
1542         unlock_kernel();
1543
1544         return rc;
1545 }
1546
1547 static const struct net_proto_family x25_family_ops = {
1548         .family =       AF_X25,
1549         .create =       x25_create,
1550         .owner  =       THIS_MODULE,
1551 };
1552
1553 #ifdef CONFIG_COMPAT
1554 static int compat_x25_subscr_ioctl(unsigned int cmd,
1555                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1556 {
1557         struct compat_x25_subscrip_struct x25_subscr;
1558         struct x25_neigh *nb;
1559         struct net_device *dev;
1560         int rc = -EINVAL;
1561
1562         rc = -EFAULT;
1563         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1564                 goto out;
1565
1566         rc = -EINVAL;
1567         dev = x25_dev_get(x25_subscr.device);
1568         if (dev == NULL)
1569                 goto out;
1570
1571         nb = x25_get_neigh(dev);
1572         if (nb == NULL)
1573                 goto out_dev_put;
1574
1575         dev_put(dev);
1576
1577         if (cmd == SIOCX25GSUBSCRIP) {
1578                 x25_subscr.extended = nb->extended;
1579                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1580                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1581                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1582         } else {
1583                 rc = -EINVAL;
1584                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1585                         rc = 0;
1586                         nb->extended = x25_subscr.extended;
1587                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1588                 }
1589         }
1590         x25_neigh_put(nb);
1591 out:
1592         return rc;
1593 out_dev_put:
1594         dev_put(dev);
1595         goto out;
1596 }
1597
1598 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1599                                 unsigned long arg)
1600 {
1601         void __user *argp = compat_ptr(arg);
1602         struct sock *sk = sock->sk;
1603
1604         int rc = -ENOIOCTLCMD;
1605
1606         switch(cmd) {
1607         case TIOCOUTQ:
1608         case TIOCINQ:
1609                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1610                 break;
1611         case SIOCGSTAMP:
1612                 rc = -EINVAL;
1613                 lock_kernel();
1614                 if (sk)
1615                         rc = compat_sock_get_timestamp(sk,
1616                                         (struct timeval __user*)argp);
1617                 unlock_kernel();
1618                 break;
1619         case SIOCGSTAMPNS:
1620                 rc = -EINVAL;
1621                 lock_kernel();
1622                 if (sk)
1623                         rc = compat_sock_get_timestampns(sk,
1624                                         (struct timespec __user*)argp);
1625                 unlock_kernel();
1626                 break;
1627         case SIOCGIFADDR:
1628         case SIOCSIFADDR:
1629         case SIOCGIFDSTADDR:
1630         case SIOCSIFDSTADDR:
1631         case SIOCGIFBRDADDR:
1632         case SIOCSIFBRDADDR:
1633         case SIOCGIFNETMASK:
1634         case SIOCSIFNETMASK:
1635         case SIOCGIFMETRIC:
1636         case SIOCSIFMETRIC:
1637                 rc = -EINVAL;
1638                 break;
1639         case SIOCADDRT:
1640         case SIOCDELRT:
1641                 rc = -EPERM;
1642                 if (!capable(CAP_NET_ADMIN))
1643                         break;
1644                 lock_kernel();
1645                 rc = x25_route_ioctl(cmd, argp);
1646                 unlock_kernel();
1647                 break;
1648         case SIOCX25GSUBSCRIP:
1649                 lock_kernel();
1650                 rc = compat_x25_subscr_ioctl(cmd, argp);
1651                 unlock_kernel();
1652                 break;
1653         case SIOCX25SSUBSCRIP:
1654                 rc = -EPERM;
1655                 if (!capable(CAP_NET_ADMIN))
1656                         break;
1657                 lock_kernel();
1658                 rc = compat_x25_subscr_ioctl(cmd, argp);
1659                 unlock_kernel();
1660                 break;
1661         case SIOCX25GFACILITIES:
1662         case SIOCX25SFACILITIES:
1663         case SIOCX25GDTEFACILITIES:
1664         case SIOCX25SDTEFACILITIES:
1665         case SIOCX25GCALLUSERDATA:
1666         case SIOCX25SCALLUSERDATA:
1667         case SIOCX25GCAUSEDIAG:
1668         case SIOCX25SCAUSEDIAG:
1669         case SIOCX25SCUDMATCHLEN:
1670         case SIOCX25CALLACCPTAPPRV:
1671         case SIOCX25SENDCALLACCPT:
1672                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1673                 break;
1674         default:
1675                 rc = -ENOIOCTLCMD;
1676                 break;
1677         }
1678         return rc;
1679 }
1680 #endif
1681
1682 static const struct proto_ops x25_proto_ops = {
1683         .family =       AF_X25,
1684         .owner =        THIS_MODULE,
1685         .release =      x25_release,
1686         .bind =         x25_bind,
1687         .connect =      x25_connect,
1688         .socketpair =   sock_no_socketpair,
1689         .accept =       x25_accept,
1690         .getname =      x25_getname,
1691         .poll =         x25_datagram_poll,
1692         .ioctl =        x25_ioctl,
1693 #ifdef CONFIG_COMPAT
1694         .compat_ioctl = compat_x25_ioctl,
1695 #endif
1696         .listen =       x25_listen,
1697         .shutdown =     sock_no_shutdown,
1698         .setsockopt =   x25_setsockopt,
1699         .getsockopt =   x25_getsockopt,
1700         .sendmsg =      x25_sendmsg,
1701         .recvmsg =      x25_recvmsg,
1702         .mmap =         sock_no_mmap,
1703         .sendpage =     sock_no_sendpage,
1704 };
1705
1706 static struct packet_type x25_packet_type __read_mostly = {
1707         .type = cpu_to_be16(ETH_P_X25),
1708         .func = x25_lapb_receive_frame,
1709 };
1710
1711 static struct notifier_block x25_dev_notifier = {
1712         .notifier_call = x25_device_event,
1713 };
1714
1715 void x25_kill_by_neigh(struct x25_neigh *nb)
1716 {
1717         struct sock *s;
1718         struct hlist_node *node;
1719
1720         write_lock_bh(&x25_list_lock);
1721
1722         sk_for_each(s, node, &x25_list)
1723                 if (x25_sk(s)->neighbour == nb)
1724                         x25_disconnect(s, ENETUNREACH, 0, 0);
1725
1726         write_unlock_bh(&x25_list_lock);
1727
1728         /* Remove any related forwards */
1729         x25_clear_forward_by_dev(nb->dev);
1730 }
1731
1732 static int __init x25_init(void)
1733 {
1734         int rc = proto_register(&x25_proto, 0);
1735
1736         if (rc != 0)
1737                 goto out;
1738
1739         rc = sock_register(&x25_family_ops);
1740         if (rc != 0)
1741                 goto out_proto;
1742
1743         dev_add_pack(&x25_packet_type);
1744
1745         rc = register_netdevice_notifier(&x25_dev_notifier);
1746         if (rc != 0)
1747                 goto out_sock;
1748
1749         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1750
1751         x25_register_sysctl();
1752         rc = x25_proc_init();
1753         if (rc != 0)
1754                 goto out_dev;
1755 out:
1756         return rc;
1757 out_dev:
1758         unregister_netdevice_notifier(&x25_dev_notifier);
1759 out_sock:
1760         sock_unregister(AF_X25);
1761 out_proto:
1762         proto_unregister(&x25_proto);
1763         goto out;
1764 }
1765 module_init(x25_init);
1766
1767 static void __exit x25_exit(void)
1768 {
1769         x25_proc_exit();
1770         x25_link_free();
1771         x25_route_free();
1772
1773         x25_unregister_sysctl();
1774
1775         unregister_netdevice_notifier(&x25_dev_notifier);
1776
1777         dev_remove_pack(&x25_packet_type);
1778
1779         sock_unregister(AF_X25);
1780         proto_unregister(&x25_proto);
1781 }
1782 module_exit(x25_exit);
1783
1784 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1785 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1786 MODULE_LICENSE("GPL");
1787 MODULE_ALIAS_NETPROTO(PF_X25);