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 #define pr_fmt(fmt) "X25: " fmt
  39
  40 #include <linux/module.h>
  41 #include <linux/capability.h>
  42 #include <linux/errno.h>
  43 #include <linux/kernel.h>
  44 #include <linux/sched/signal.h>
  45 #include <linux/timer.h>
  46 #include <linux/string.h>
  47 #include <linux/net.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_arp.h>
  50 #include <linux/skbuff.h>
  51 #include <linux/slab.h>
  52 #include <net/sock.h>
  53 #include <net/tcp_states.h>
  54 #include <linux/uaccess.h>
  55 #include <linux/fcntl.h>
  56 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  57 #include <linux/notifier.h>
  58 #include <linux/init.h>
  59 #include <linux/compat.h>
  60 #include <linux/ctype.h>
  61
  62 #include <net/x25.h>
  63 #include <net/compat.h>
  64
  65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  66 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  67 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  68 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  69 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  70 int sysctl_x25_forward                 = 0;
  71
  72 HLIST_HEAD(x25_list);
  73 DEFINE_RWLOCK(x25_list_lock);
  74
  75 static const struct proto_ops x25_proto_ops;
  76
  77 static const struct x25_address null_x25_address = {"               "};
  78
  79 #ifdef CONFIG_COMPAT
  80 struct compat_x25_subscrip_struct {
  81         char device[200-sizeof(compat_ulong_t)];
  82         compat_ulong_t global_facil_mask;
  83         compat_uint_t extended;
  84 };
  85 #endif
  86
  87
  88 int x25_parse_address_block(struct sk_buff *skb,
  89                 struct x25_address *called_addr,
  90                 struct x25_address *calling_addr)
  91 {
  92         unsigned char len;
  93         int needed;
  94         int rc;
  95
  96         if (!pskb_may_pull(skb, 1)) {
  97                 /* packet has no address block */
  98                 rc = 0;
  99                 goto empty;
 100         }
 101
 102         len = *skb->data;
 103         needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
 104
 105         if (!pskb_may_pull(skb, needed)) {
 106                 /* packet is too short to hold the addresses it claims
 107                    to hold */
 108                 rc = -1;
 109                 goto empty;
 110         }
 111
 112         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 113
 114 empty:
 115         *called_addr->x25_addr = 0;
 116         *calling_addr->x25_addr = 0;
 117
 118         return rc;
 119 }
 120
 121
 122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 123                   struct x25_address *calling_addr)
 124 {
 125         unsigned int called_len, calling_len;
 126         char *called, *calling;
 127         unsigned int i;
 128
 129         called_len  = (*p >> 0) & 0x0F;
 130         calling_len = (*p >> 4) & 0x0F;
 131
 132         called  = called_addr->x25_addr;
 133         calling = calling_addr->x25_addr;
 134         p++;
 135
 136         for (i = 0; i < (called_len + calling_len); i++) {
 137                 if (i < called_len) {
 138                         if (i % 2 != 0) {
 139                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 140                                 p++;
 141                         } else {
 142                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 143                         }
 144                 } else {
 145                         if (i % 2 != 0) {
 146                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 147                                 p++;
 148                         } else {
 149                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 150                         }
 151                 }
 152         }
 153
 154         *called = *calling = '\0';
 155
 156         return 1 + (called_len + calling_len + 1) / 2;
 157 }
 158
 159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 160                   struct x25_address *calling_addr)
 161 {
 162         unsigned int called_len, calling_len;
 163         char *called, *calling;
 164         int i;
 165
 166         called  = called_addr->x25_addr;
 167         calling = calling_addr->x25_addr;
 168
 169         called_len  = strlen(called);
 170         calling_len = strlen(calling);
 171
 172         *p++ = (calling_len << 4) | (called_len << 0);
 173
 174         for (i = 0; i < (called_len + calling_len); i++) {
 175                 if (i < called_len) {
 176                         if (i % 2 != 0) {
 177                                 *p |= (*called++ - '0') << 0;
 178                                 p++;
 179                         } else {
 180                                 *p = 0x00;
 181                                 *p |= (*called++ - '0') << 4;
 182                         }
 183                 } else {
 184                         if (i % 2 != 0) {
 185                                 *p |= (*calling++ - '0') << 0;
 186                                 p++;
 187                         } else {
 188                                 *p = 0x00;
 189                                 *p |= (*calling++ - '0') << 4;
 190                         }
 191                 }
 192         }
 193
 194         return 1 + (called_len + calling_len + 1) / 2;
 195 }
 196
 197 /*
 198  *      Socket removal during an interrupt is now safe.
 199  */
 200 static void x25_remove_socket(struct sock *sk)
 201 {
 202         write_lock_bh(&x25_list_lock);
 203         sk_del_node_init(sk);
 204         write_unlock_bh(&x25_list_lock);
 205 }
 206
 207 /*
 208  *      Kill all bound sockets on a dropped device.
 209  */
 210 static void x25_kill_by_device(struct net_device *dev)
 211 {
 212         struct sock *s;
 213
 214         write_lock_bh(&x25_list_lock);
 215
 216         sk_for_each(s, &x25_list)
 217                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 218                         x25_disconnect(s, ENETUNREACH, 0, 0);
 219
 220         write_unlock_bh(&x25_list_lock);
 221 }
 222
 223 /*
 224  *      Handle device status changes.
 225  */
 226 static int x25_device_event(struct notifier_block *this, unsigned long event,
 227                             void *ptr)
 228 {
 229         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 230         struct x25_neigh *nb;
 231
 232         if (!net_eq(dev_net(dev), &init_net))
 233                 return NOTIFY_DONE;
 234
 235         if (dev->type == ARPHRD_X25
 236 #if IS_ENABLED(CONFIG_LLC)
 237          || dev->type == ARPHRD_ETHER
 238 #endif
 239          ) {
 240                 switch (event) {
 241                 case NETDEV_UP:
 242                         x25_link_device_up(dev);
 243                         break;
 244                 case NETDEV_GOING_DOWN:
 245                         nb = x25_get_neigh(dev);
 246                         if (nb) {
 247                                 x25_terminate_link(nb);
 248                                 x25_neigh_put(nb);
 249                         }
 250                         break;
 251                 case NETDEV_DOWN:
 252                         x25_kill_by_device(dev);
 253                         x25_route_device_down(dev);
 254                         x25_link_device_down(dev);
 255                         break;
 256                 }
 257         }
 258
 259         return NOTIFY_DONE;
 260 }
 261
 262 /*
 263  *      Add a socket to the bound sockets list.
 264  */
 265 static void x25_insert_socket(struct sock *sk)
 266 {
 267         write_lock_bh(&x25_list_lock);
 268         sk_add_node(sk, &x25_list);
 269         write_unlock_bh(&x25_list_lock);
 270 }
 271
 272 /*
 273  *      Find a socket that wants to accept the Call Request we just
 274  *      received. Check the full list for an address/cud match.
 275  *      If no cuds match return the next_best thing, an address match.
 276  *      Note: if a listening socket has cud set it must only get calls
 277  *      with matching cud.
 278  */
 279 static struct sock *x25_find_listener(struct x25_address *addr,
 280                                         struct sk_buff *skb)
 281 {
 282         struct sock *s;
 283         struct sock *next_best;
 284
 285         read_lock_bh(&x25_list_lock);
 286         next_best = NULL;
 287
 288         sk_for_each(s, &x25_list)
 289                 if ((!strcmp(addr->x25_addr,
 290                         x25_sk(s)->source_addr.x25_addr) ||
 291                                 !strcmp(x25_sk(s)->source_addr.x25_addr,
 292                                         null_x25_address.x25_addr)) &&
 293                                         s->sk_state == TCP_LISTEN) {
 294                         /*
 295                          * Found a listening socket, now check the incoming
 296                          * call user data vs this sockets call user data
 297                          */
 298                         if (x25_sk(s)->cudmatchlength > 0 &&
 299                                 skb->len >= x25_sk(s)->cudmatchlength) {
 300                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 301                                         skb->data,
 302                                         x25_sk(s)->cudmatchlength)) == 0) {
 303                                         sock_hold(s);
 304                                         goto found;
 305                                  }
 306                         } else
 307                                 next_best = s;
 308                 }
 309         if (next_best) {
 310                 s = next_best;
 311                 sock_hold(s);
 312                 goto found;
 313         }
 314         s = NULL;
 315 found:
 316         read_unlock_bh(&x25_list_lock);
 317         return s;
 318 }
 319
 320 /*
 321  *      Find a connected X.25 socket given my LCI and neighbour.
 322  */
 323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 324 {
 325         struct sock *s;
 326
 327         sk_for_each(s, &x25_list)
 328                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 329                         sock_hold(s);
 330                         goto found;
 331                 }
 332         s = NULL;
 333 found:
 334         return s;
 335 }
 336
 337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 338 {
 339         struct sock *s;
 340
 341         read_lock_bh(&x25_list_lock);
 342         s = __x25_find_socket(lci, nb);
 343         read_unlock_bh(&x25_list_lock);
 344         return s;
 345 }
 346
 347 /*
 348  *      Find a unique LCI for a given device.
 349  */
 350 static unsigned int x25_new_lci(struct x25_neigh *nb)
 351 {
 352         unsigned int lci = 1;
 353         struct sock *sk;
 354
 355         while ((sk = x25_find_socket(lci, nb)) != NULL) {
 356                 sock_put(sk);
 357                 if (++lci == 4096) {
 358                         lci = 0;
 359                         break;
 360                 }
 361                 cond_resched();
 362         }
 363
 364         return lci;
 365 }
 366
 367 /*
 368  *      Deferred destroy.
 369  */
 370 static void __x25_destroy_socket(struct sock *);
 371
 372 /*
 373  *      handler for deferred kills.
 374  */
 375 static void x25_destroy_timer(struct timer_list *t)
 376 {
 377         struct sock *sk = from_timer(sk, t, sk_timer);
 378
 379         x25_destroy_socket_from_timer(sk);
 380 }
 381
 382 /*
 383  *      This is called from user mode and the timers. Thus it protects itself
 384  *      against interrupt users but doesn't worry about being called during
 385  *      work. Once it is removed from the queue no interrupt or bottom half
 386  *      will touch it and we are (fairly 8-) ) safe.
 387  *      Not static as it's used by the timer
 388  */
 389 static void __x25_destroy_socket(struct sock *sk)
 390 {
 391         struct sk_buff *skb;
 392
 393         x25_stop_heartbeat(sk);
 394         x25_stop_timer(sk);
 395
 396         x25_remove_socket(sk);
 397         x25_clear_queues(sk);           /* Flush the queues */
 398
 399         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 400                 if (skb->sk != sk) {            /* A pending connection */
 401                         /*
 402                          * Queue the unaccepted socket for death
 403                          */
 404                         skb->sk->sk_state = TCP_LISTEN;
 405                         sock_set_flag(skb->sk, SOCK_DEAD);
 406                         x25_start_heartbeat(skb->sk);
 407                         x25_sk(skb->sk)->state = X25_STATE_0;
 408                 }
 409
 410                 kfree_skb(skb);
 411         }
 412
 413         if (sk_has_allocations(sk)) {
 414                 /* Defer: outstanding buffers */
 415                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 416                 sk->sk_timer.function = x25_destroy_timer;
 417                 add_timer(&sk->sk_timer);
 418         } else {
 419                 /* drop last reference so sock_put will free */
 420                 __sock_put(sk);
 421         }
 422 }
 423
 424 void x25_destroy_socket_from_timer(struct sock *sk)
 425 {
 426         sock_hold(sk);
 427         bh_lock_sock(sk);
 428         __x25_destroy_socket(sk);
 429         bh_unlock_sock(sk);
 430         sock_put(sk);
 431 }
 432
 433 /*
 434  *      Handling for system calls applied via the various interfaces to a
 435  *      X.25 socket object.
 436  */
 437
 438 static int x25_setsockopt(struct socket *sock, int level, int optname,
 439                           char __user *optval, unsigned int optlen)
 440 {
 441         int opt;
 442         struct sock *sk = sock->sk;
 443         int rc = -ENOPROTOOPT;
 444
 445         if (level != SOL_X25 || optname != X25_QBITINCL)
 446                 goto out;
 447
 448         rc = -EINVAL;
 449         if (optlen < sizeof(int))
 450                 goto out;
 451
 452         rc = -EFAULT;
 453         if (get_user(opt, (int __user *)optval))
 454                 goto out;
 455
 456         if (opt)
 457                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 458         else
 459                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 460         rc = 0;
 461 out:
 462         return rc;
 463 }
 464
 465 static int x25_getsockopt(struct socket *sock, int level, int optname,
 466                           char __user *optval, int __user *optlen)
 467 {
 468         struct sock *sk = sock->sk;
 469         int val, len, rc = -ENOPROTOOPT;
 470
 471         if (level != SOL_X25 || optname != X25_QBITINCL)
 472                 goto out;
 473
 474         rc = -EFAULT;
 475         if (get_user(len, optlen))
 476                 goto out;
 477
 478         len = min_t(unsigned int, len, sizeof(int));
 479
 480         rc = -EINVAL;
 481         if (len < 0)
 482                 goto out;
 483
 484         rc = -EFAULT;
 485         if (put_user(len, optlen))
 486                 goto out;
 487
 488         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 489         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 490 out:
 491         return rc;
 492 }
 493
 494 static int x25_listen(struct socket *sock, int backlog)
 495 {
 496         struct sock *sk = sock->sk;
 497         int rc = -EOPNOTSUPP;
 498
 499         lock_sock(sk);
 500         if (sk->sk_state != TCP_LISTEN) {
 501                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 502                 sk->sk_max_ack_backlog = backlog;
 503                 sk->sk_state           = TCP_LISTEN;
 504                 rc = 0;
 505         }
 506         release_sock(sk);
 507
 508         return rc;
 509 }
 510
 511 static struct proto x25_proto = {
 512         .name     = "X25",
 513         .owner    = THIS_MODULE,
 514         .obj_size = sizeof(struct x25_sock),
 515 };
 516
 517 static struct sock *x25_alloc_socket(struct net *net, int kern)
 518 {
 519         struct x25_sock *x25;
 520         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 521
 522         if (!sk)
 523                 goto out;
 524
 525         sock_init_data(NULL, sk);
 526
 527         x25 = x25_sk(sk);
 528         skb_queue_head_init(&x25->ack_queue);
 529         skb_queue_head_init(&x25->fragment_queue);
 530         skb_queue_head_init(&x25->interrupt_in_queue);
 531         skb_queue_head_init(&x25->interrupt_out_queue);
 532 out:
 533         return sk;
 534 }
 535
 536 static int x25_create(struct net *net, struct socket *sock, int protocol,
 537                       int kern)
 538 {
 539         struct sock *sk;
 540         struct x25_sock *x25;
 541         int rc = -EAFNOSUPPORT;
 542
 543         if (!net_eq(net, &init_net))
 544                 goto out;
 545
 546         rc = -ESOCKTNOSUPPORT;
 547         if (sock->type != SOCK_SEQPACKET)
 548                 goto out;
 549
 550         rc = -EINVAL;
 551         if (protocol)
 552                 goto out;
 553
 554         rc = -ENOBUFS;
 555         if ((sk = x25_alloc_socket(net, kern)) == NULL)
 556                 goto out;
 557
 558         x25 = x25_sk(sk);
 559
 560         sock_init_data(sock, sk);
 561
 562         x25_init_timers(sk);
 563
 564         sock->ops    = &x25_proto_ops;
 565         sk->sk_protocol = protocol;
 566         sk->sk_backlog_rcv = x25_backlog_rcv;
 567
 568         x25->t21   = sysctl_x25_call_request_timeout;
 569         x25->t22   = sysctl_x25_reset_request_timeout;
 570         x25->t23   = sysctl_x25_clear_request_timeout;
 571         x25->t2    = sysctl_x25_ack_holdback_timeout;
 572         x25->state = X25_STATE_0;
 573         x25->cudmatchlength = 0;
 574         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 575                                                         /* on call accept   */
 576
 577         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 578         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 579         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 580         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 581         x25->facilities.throughput  = 0;        /* by default don't negotiate
 582                                                    throughput */
 583         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 584         x25->dte_facilities.calling_len = 0;
 585         x25->dte_facilities.called_len = 0;
 586         memset(x25->dte_facilities.called_ae, '\0',
 587                         sizeof(x25->dte_facilities.called_ae));
 588         memset(x25->dte_facilities.calling_ae, '\0',
 589                         sizeof(x25->dte_facilities.calling_ae));
 590
 591         rc = 0;
 592 out:
 593         return rc;
 594 }
 595
 596 static struct sock *x25_make_new(struct sock *osk)
 597 {
 598         struct sock *sk = NULL;
 599         struct x25_sock *x25, *ox25;
 600
 601         if (osk->sk_type != SOCK_SEQPACKET)
 602                 goto out;
 603
 604         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
 605                 goto out;
 606
 607         x25 = x25_sk(sk);
 608
 609         sk->sk_type        = osk->sk_type;
 610         sk->sk_priority    = osk->sk_priority;
 611         sk->sk_protocol    = osk->sk_protocol;
 612         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 613         sk->sk_sndbuf      = osk->sk_sndbuf;
 614         sk->sk_state       = TCP_ESTABLISHED;
 615         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 616         sock_copy_flags(sk, osk);
 617
 618         ox25 = x25_sk(osk);
 619         x25->t21        = ox25->t21;
 620         x25->t22        = ox25->t22;
 621         x25->t23        = ox25->t23;
 622         x25->t2         = ox25->t2;
 623         x25->flags      = ox25->flags;
 624         x25->facilities = ox25->facilities;
 625         x25->dte_facilities = ox25->dte_facilities;
 626         x25->cudmatchlength = ox25->cudmatchlength;
 627
 628         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 629         x25_init_timers(sk);
 630 out:
 631         return sk;
 632 }
 633
 634 static int x25_release(struct socket *sock)
 635 {
 636         struct sock *sk = sock->sk;
 637         struct x25_sock *x25;
 638
 639         if (!sk)
 640                 return 0;
 641
 642         x25 = x25_sk(sk);
 643
 644         sock_hold(sk);
 645         lock_sock(sk);
 646         switch (x25->state) {
 647
 648                 case X25_STATE_0:
 649                 case X25_STATE_2:
 650                         x25_disconnect(sk, 0, 0, 0);
 651                         __x25_destroy_socket(sk);
 652                         goto out;
 653
 654                 case X25_STATE_1:
 655                 case X25_STATE_3:
 656                 case X25_STATE_4:
 657                         x25_clear_queues(sk);
 658                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 659                         x25_start_t23timer(sk);
 660                         x25->state = X25_STATE_2;
 661                         sk->sk_state    = TCP_CLOSE;
 662                         sk->sk_shutdown |= SEND_SHUTDOWN;
 663                         sk->sk_state_change(sk);
 664                         sock_set_flag(sk, SOCK_DEAD);
 665                         sock_set_flag(sk, SOCK_DESTROY);
 666                         break;
 667         }
 668
 669         sock_orphan(sk);
 670 out:
 671         release_sock(sk);
 672         sock_put(sk);
 673         return 0;
 674 }
 675
 676 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 677 {
 678         struct sock *sk = sock->sk;
 679         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 680         int len, i, rc = 0;
 681
 682         if (addr_len != sizeof(struct sockaddr_x25) ||
 683             addr->sx25_family != AF_X25) {
 684                 rc = -EINVAL;
 685                 goto out;
 686         }
 687
 688         /* check for the null_x25_address */
 689         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
 690
 691                 len = strlen(addr->sx25_addr.x25_addr);
 692                 for (i = 0; i < len; i++) {
 693                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 694                                 rc = -EINVAL;
 695                                 goto out;
 696                         }
 697                 }
 698         }
 699
 700         lock_sock(sk);
 701         if (sock_flag(sk, SOCK_ZAPPED)) {
 702                 x25_sk(sk)->source_addr = addr->sx25_addr;
 703                 x25_insert_socket(sk);
 704                 sock_reset_flag(sk, SOCK_ZAPPED);
 705         } else {
 706                 rc = -EINVAL;
 707         }
 708         release_sock(sk);
 709         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 710 out:
 711         return rc;
 712 }
 713
 714 static int x25_wait_for_connection_establishment(struct sock *sk)
 715 {
 716         DECLARE_WAITQUEUE(wait, current);
 717         int rc;
 718
 719         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 720         for (;;) {
 721                 __set_current_state(TASK_INTERRUPTIBLE);
 722                 rc = -ERESTARTSYS;
 723                 if (signal_pending(current))
 724                         break;
 725                 rc = sock_error(sk);
 726                 if (rc) {
 727                         sk->sk_socket->state = SS_UNCONNECTED;
 728                         break;
 729                 }
 730                 rc = 0;
 731                 if (sk->sk_state != TCP_ESTABLISHED) {
 732                         release_sock(sk);
 733                         schedule();
 734                         lock_sock(sk);
 735                 } else
 736                         break;
 737         }
 738         __set_current_state(TASK_RUNNING);
 739         remove_wait_queue(sk_sleep(sk), &wait);
 740         return rc;
 741 }
 742
 743 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 744                        int addr_len, int flags)
 745 {
 746         struct sock *sk = sock->sk;
 747         struct x25_sock *x25 = x25_sk(sk);
 748         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 749         struct x25_route *rt;
 750         int rc = 0;
 751
 752         lock_sock(sk);
 753         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 754                 sock->state = SS_CONNECTED;
 755                 goto out; /* Connect completed during a ERESTARTSYS event */
 756         }
 757
 758         rc = -ECONNREFUSED;
 759         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 760                 sock->state = SS_UNCONNECTED;
 761                 goto out;
 762         }
 763
 764         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 765         if (sk->sk_state == TCP_ESTABLISHED)
 766                 goto out;
 767
 768         sk->sk_state   = TCP_CLOSE;
 769         sock->state = SS_UNCONNECTED;
 770
 771         rc = -EINVAL;
 772         if (addr_len != sizeof(struct sockaddr_x25) ||
 773             addr->sx25_family != AF_X25)
 774                 goto out;
 775
 776         rc = -ENETUNREACH;
 777         rt = x25_get_route(&addr->sx25_addr);
 778         if (!rt)
 779                 goto out;
 780
 781         x25->neighbour = x25_get_neigh(rt->dev);
 782         if (!x25->neighbour)
 783                 goto out_put_route;
 784
 785         x25_limit_facilities(&x25->facilities, x25->neighbour);
 786
 787         x25->lci = x25_new_lci(x25->neighbour);
 788         if (!x25->lci)
 789                 goto out_put_neigh;
 790
 791         rc = -EINVAL;
 792         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 793                 goto out_put_neigh;
 794
 795         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 796                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 797
 798         x25->dest_addr = addr->sx25_addr;
 799
 800         /* Move to connecting socket, start sending Connect Requests */
 801         sock->state   = SS_CONNECTING;
 802         sk->sk_state  = TCP_SYN_SENT;
 803
 804         x25->state = X25_STATE_1;
 805
 806         x25_write_internal(sk, X25_CALL_REQUEST);
 807
 808         x25_start_heartbeat(sk);
 809         x25_start_t21timer(sk);
 810
 811         /* Now the loop */
 812         rc = -EINPROGRESS;
 813         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 814                 goto out_put_neigh;
 815
 816         rc = x25_wait_for_connection_establishment(sk);
 817         if (rc)
 818                 goto out_put_neigh;
 819
 820         sock->state = SS_CONNECTED;
 821         rc = 0;
 822 out_put_neigh:
 823         if (rc) {
 824                 read_lock_bh(&x25_list_lock);
 825                 x25_neigh_put(x25->neighbour);
 826                 x25->neighbour = NULL;
 827                 read_unlock_bh(&x25_list_lock);
 828                 x25->state = X25_STATE_0;
 829         }
 830 out_put_route:
 831         x25_route_put(rt);
 832 out:
 833         release_sock(sk);
 834         return rc;
 835 }
 836
 837 static int x25_wait_for_data(struct sock *sk, long timeout)
 838 {
 839         DECLARE_WAITQUEUE(wait, current);
 840         int rc = 0;
 841
 842         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 843         for (;;) {
 844                 __set_current_state(TASK_INTERRUPTIBLE);
 845                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 846                         break;
 847                 rc = -ERESTARTSYS;
 848                 if (signal_pending(current))
 849                         break;
 850                 rc = -EAGAIN;
 851                 if (!timeout)
 852                         break;
 853                 rc = 0;
 854                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 855                         release_sock(sk);
 856                         timeout = schedule_timeout(timeout);
 857                         lock_sock(sk);
 858                 } else
 859                         break;
 860         }
 861         __set_current_state(TASK_RUNNING);
 862         remove_wait_queue(sk_sleep(sk), &wait);
 863         return rc;
 864 }
 865
 866 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 867                       bool kern)
 868 {
 869         struct sock *sk = sock->sk;
 870         struct sock *newsk;
 871         struct sk_buff *skb;
 872         int rc = -EINVAL;
 873
 874         if (!sk)
 875                 goto out;
 876
 877         rc = -EOPNOTSUPP;
 878         if (sk->sk_type != SOCK_SEQPACKET)
 879                 goto out;
 880
 881         lock_sock(sk);
 882         rc = -EINVAL;
 883         if (sk->sk_state != TCP_LISTEN)
 884                 goto out2;
 885
 886         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 887         if (rc)
 888                 goto out2;
 889         skb = skb_dequeue(&sk->sk_receive_queue);
 890         rc = -EINVAL;
 891         if (!skb->sk)
 892                 goto out2;
 893         newsk            = skb->sk;
 894         sock_graft(newsk, newsock);
 895
 896         /* Now attach up the new socket */
 897         skb->sk = NULL;
 898         kfree_skb(skb);
 899         sk->sk_ack_backlog--;
 900         newsock->state = SS_CONNECTED;
 901         rc = 0;
 902 out2:
 903         release_sock(sk);
 904 out:
 905         return rc;
 906 }
 907
 908 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 909                        int peer)
 910 {
 911         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 912         struct sock *sk = sock->sk;
 913         struct x25_sock *x25 = x25_sk(sk);
 914         int rc = 0;
 915
 916         if (peer) {
 917                 if (sk->sk_state != TCP_ESTABLISHED) {
 918                         rc = -ENOTCONN;
 919                         goto out;
 920                 }
 921                 sx25->sx25_addr = x25->dest_addr;
 922         } else
 923                 sx25->sx25_addr = x25->source_addr;
 924
 925         sx25->sx25_family = AF_X25;
 926         rc = sizeof(*sx25);
 927
 928 out:
 929         return rc;
 930 }
 931
 932 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 933                         unsigned int lci)
 934 {
 935         struct sock *sk;
 936         struct sock *make;
 937         struct x25_sock *makex25;
 938         struct x25_address source_addr, dest_addr;
 939         struct x25_facilities facilities;
 940         struct x25_dte_facilities dte_facilities;
 941         int len, addr_len, rc;
 942
 943         /*
 944          *      Remove the LCI and frame type.
 945          */
 946         skb_pull(skb, X25_STD_MIN_LEN);
 947
 948         /*
 949          *      Extract the X.25 addresses and convert them to ASCII strings,
 950          *      and remove them.
 951          *
 952          *      Address block is mandatory in call request packets
 953          */
 954         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 955         if (addr_len <= 0)
 956                 goto out_clear_request;
 957         skb_pull(skb, addr_len);
 958
 959         /*
 960          *      Get the length of the facilities, skip past them for the moment
 961          *      get the call user data because this is needed to determine
 962          *      the correct listener
 963          *
 964          *      Facilities length is mandatory in call request packets
 965          */
 966         if (!pskb_may_pull(skb, 1))
 967                 goto out_clear_request;
 968         len = skb->data[0] + 1;
 969         if (!pskb_may_pull(skb, len))
 970                 goto out_clear_request;
 971         skb_pull(skb,len);
 972
 973         /*
 974          *      Ensure that the amount of call user data is valid.
 975          */
 976         if (skb->len > X25_MAX_CUD_LEN)
 977                 goto out_clear_request;
 978
 979         /*
 980          *      Get all the call user data so it can be used in
 981          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 982          */
 983         if (!pskb_may_pull(skb, skb->len))
 984                 goto out_clear_request;
 985
 986         /*
 987          *      Find a listener for the particular address/cud pair.
 988          */
 989         sk = x25_find_listener(&source_addr,skb);
 990         skb_push(skb,len);
 991
 992         if (sk != NULL && sk_acceptq_is_full(sk)) {
 993                 goto out_sock_put;
 994         }
 995
 996         /*
 997          *      We dont have any listeners for this incoming call.
 998          *      Try forwarding it.
 999          */
1000         if (sk == NULL) {
1001                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1002                 if (sysctl_x25_forward &&
1003                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1004                 {
1005                         /* Call was forwarded, dont process it any more */
1006                         kfree_skb(skb);
1007                         rc = 1;
1008                         goto out;
1009                 } else {
1010                         /* No listeners, can't forward, clear the call */
1011                         goto out_clear_request;
1012                 }
1013         }
1014
1015         /*
1016          *      Try to reach a compromise on the requested facilities.
1017          */
1018         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1019         if (len == -1)
1020                 goto out_sock_put;
1021
1022         /*
1023          * current neighbour/link might impose additional limits
1024          * on certain facilties
1025          */
1026
1027         x25_limit_facilities(&facilities, nb);
1028
1029         /*
1030          *      Try to create a new socket.
1031          */
1032         make = x25_make_new(sk);
1033         if (!make)
1034                 goto out_sock_put;
1035
1036         /*
1037          *      Remove the facilities
1038          */
1039         skb_pull(skb, len);
1040
1041         skb->sk     = make;
1042         make->sk_state = TCP_ESTABLISHED;
1043
1044         makex25 = x25_sk(make);
1045         makex25->lci           = lci;
1046         makex25->dest_addr     = dest_addr;
1047         makex25->source_addr   = source_addr;
1048         makex25->neighbour     = nb;
1049         makex25->facilities    = facilities;
1050         makex25->dte_facilities= dte_facilities;
1051         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1052         /* ensure no reverse facil on accept */
1053         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1054         /* ensure no calling address extension on accept */
1055         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1056         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1057
1058         /* Normally all calls are accepted immediately */
1059         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1060                 x25_write_internal(make, X25_CALL_ACCEPTED);
1061                 makex25->state = X25_STATE_3;
1062         }
1063
1064         /*
1065          *      Incoming Call User Data.
1066          */
1067         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1068         makex25->calluserdata.cudlength = skb->len;
1069
1070         sk->sk_ack_backlog++;
1071
1072         x25_insert_socket(make);
1073
1074         skb_queue_head(&sk->sk_receive_queue, skb);
1075
1076         x25_start_heartbeat(make);
1077
1078         if (!sock_flag(sk, SOCK_DEAD))
1079                 sk->sk_data_ready(sk);
1080         rc = 1;
1081         sock_put(sk);
1082 out:
1083         return rc;
1084 out_sock_put:
1085         sock_put(sk);
1086 out_clear_request:
1087         rc = 0;
1088         x25_transmit_clear_request(nb, lci, 0x01);
1089         goto out;
1090 }
1091
1092 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1093 {
1094         struct sock *sk = sock->sk;
1095         struct x25_sock *x25 = x25_sk(sk);
1096         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1097         struct sockaddr_x25 sx25;
1098         struct sk_buff *skb;
1099         unsigned char *asmptr;
1100         int noblock = msg->msg_flags & MSG_DONTWAIT;
1101         size_t size;
1102         int qbit = 0, rc = -EINVAL;
1103
1104         lock_sock(sk);
1105         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1106                 goto out;
1107
1108         /* we currently don't support segmented records at the user interface */
1109         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1110                 goto out;
1111
1112         rc = -EADDRNOTAVAIL;
1113         if (sock_flag(sk, SOCK_ZAPPED))
1114                 goto out;
1115
1116         rc = -EPIPE;
1117         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1118                 send_sig(SIGPIPE, current, 0);
1119                 goto out;
1120         }
1121
1122         rc = -ENETUNREACH;
1123         if (!x25->neighbour)
1124                 goto out;
1125
1126         if (usx25) {
1127                 rc = -EINVAL;
1128                 if (msg->msg_namelen < sizeof(sx25))
1129                         goto out;
1130                 memcpy(&sx25, usx25, sizeof(sx25));
1131                 rc = -EISCONN;
1132                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1133                         goto out;
1134                 rc = -EINVAL;
1135                 if (sx25.sx25_family != AF_X25)
1136                         goto out;
1137         } else {
1138                 /*
1139                  *      FIXME 1003.1g - if the socket is like this because
1140                  *      it has become closed (not started closed) we ought
1141                  *      to SIGPIPE, EPIPE;
1142                  */
1143                 rc = -ENOTCONN;
1144                 if (sk->sk_state != TCP_ESTABLISHED)
1145                         goto out;
1146
1147                 sx25.sx25_family = AF_X25;
1148                 sx25.sx25_addr   = x25->dest_addr;
1149         }
1150
1151         /* Sanity check the packet size */
1152         if (len > 65535) {
1153                 rc = -EMSGSIZE;
1154                 goto out;
1155         }
1156
1157         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1158
1159         /* Build a packet */
1160         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1161
1162         if ((msg->msg_flags & MSG_OOB) && len > 32)
1163                 len = 32;
1164
1165         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1166
1167         release_sock(sk);
1168         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1169         lock_sock(sk);
1170         if (!skb)
1171                 goto out;
1172         X25_SKB_CB(skb)->flags = msg->msg_flags;
1173
1174         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1175
1176         /*
1177          *      Put the data on the end
1178          */
1179         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1180
1181         skb_reset_transport_header(skb);
1182         skb_put(skb, len);
1183
1184         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1185         if (rc)
1186                 goto out_kfree_skb;
1187
1188         /*
1189          *      If the Q BIT Include socket option is in force, the first
1190          *      byte of the user data is the logical value of the Q Bit.
1191          */
1192         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1193                 if (!pskb_may_pull(skb, 1))
1194                         goto out_kfree_skb;
1195
1196                 qbit = skb->data[0];
1197                 skb_pull(skb, 1);
1198         }
1199
1200         /*
1201          *      Push down the X.25 header
1202          */
1203         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1204
1205         if (msg->msg_flags & MSG_OOB) {
1206                 if (x25->neighbour->extended) {
1207                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1208                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1209                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1210                         *asmptr++ = X25_INTERRUPT;
1211                 } else {
1212                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1213                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1214                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1215                         *asmptr++ = X25_INTERRUPT;
1216                 }
1217         } else {
1218                 if (x25->neighbour->extended) {
1219                         /* Build an Extended X.25 header */
1220                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1221                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1222                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1223                         *asmptr++ = X25_DATA;
1224                         *asmptr++ = X25_DATA;
1225                 } else {
1226                         /* Build an Standard X.25 header */
1227                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1228                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1229                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1230                         *asmptr++ = X25_DATA;
1231                 }
1232
1233                 if (qbit)
1234                         skb->data[0] |= X25_Q_BIT;
1235         }
1236
1237         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1238         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1239
1240         rc = -ENOTCONN;
1241         if (sk->sk_state != TCP_ESTABLISHED)
1242                 goto out_kfree_skb;
1243
1244         if (msg->msg_flags & MSG_OOB)
1245                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1246         else {
1247                 rc = x25_output(sk, skb);
1248                 len = rc;
1249                 if (rc < 0)
1250                         kfree_skb(skb);
1251                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1252                         len++;
1253         }
1254
1255         x25_kick(sk);
1256         rc = len;
1257 out:
1258         release_sock(sk);
1259         return rc;
1260 out_kfree_skb:
1261         kfree_skb(skb);
1262         goto out;
1263 }
1264
1265
1266 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1267                        int flags)
1268 {
1269         struct sock *sk = sock->sk;
1270         struct x25_sock *x25 = x25_sk(sk);
1271         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1272         size_t copied;
1273         int qbit, header_len;
1274         struct sk_buff *skb;
1275         unsigned char *asmptr;
1276         int rc = -ENOTCONN;
1277
1278         lock_sock(sk);
1279
1280         if (x25->neighbour == NULL)
1281                 goto out;
1282
1283         header_len = x25->neighbour->extended ?
1284                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1285
1286         /*
1287          * This works for seqpacket too. The receiver has ordered the queue for
1288          * us! We do one quick check first though
1289          */
1290         if (sk->sk_state != TCP_ESTABLISHED)
1291                 goto out;
1292
1293         if (flags & MSG_OOB) {
1294                 rc = -EINVAL;
1295                 if (sock_flag(sk, SOCK_URGINLINE) ||
1296                     !skb_peek(&x25->interrupt_in_queue))
1297                         goto out;
1298
1299                 skb = skb_dequeue(&x25->interrupt_in_queue);
1300
1301                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1302                         goto out_free_dgram;
1303
1304                 skb_pull(skb, X25_STD_MIN_LEN);
1305
1306                 /*
1307                  *      No Q bit information on Interrupt data.
1308                  */
1309                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1310                         asmptr  = skb_push(skb, 1);
1311                         *asmptr = 0x00;
1312                 }
1313
1314                 msg->msg_flags |= MSG_OOB;
1315         } else {
1316                 /* Now we can treat all alike */
1317                 release_sock(sk);
1318                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1319                                         flags & MSG_DONTWAIT, &rc);
1320                 lock_sock(sk);
1321                 if (!skb)
1322                         goto out;
1323
1324                 if (!pskb_may_pull(skb, header_len))
1325                         goto out_free_dgram;
1326
1327                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1328
1329                 skb_pull(skb, header_len);
1330
1331                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1332                         asmptr  = skb_push(skb, 1);
1333                         *asmptr = qbit;
1334                 }
1335         }
1336
1337         skb_reset_transport_header(skb);
1338         copied = skb->len;
1339
1340         if (copied > size) {
1341                 copied = size;
1342                 msg->msg_flags |= MSG_TRUNC;
1343         }
1344
1345         /* Currently, each datagram always contains a complete record */
1346         msg->msg_flags |= MSG_EOR;
1347
1348         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1349         if (rc)
1350                 goto out_free_dgram;
1351
1352         if (sx25) {
1353                 sx25->sx25_family = AF_X25;
1354                 sx25->sx25_addr   = x25->dest_addr;
1355                 msg->msg_namelen = sizeof(*sx25);
1356         }
1357
1358         x25_check_rbuf(sk);
1359         rc = copied;
1360 out_free_dgram:
1361         skb_free_datagram(sk, skb);
1362 out:
1363         release_sock(sk);
1364         return rc;
1365 }
1366
1367
1368 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1369 {
1370         struct sock *sk = sock->sk;
1371         struct x25_sock *x25 = x25_sk(sk);
1372         void __user *argp = (void __user *)arg;
1373         int rc;
1374
1375         switch (cmd) {
1376         case TIOCOUTQ: {
1377                 int amount;
1378
1379                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1380                 if (amount < 0)
1381                         amount = 0;
1382                 rc = put_user(amount, (unsigned int __user *)argp);
1383                 break;
1384         }
1385
1386         case TIOCINQ: {
1387                 struct sk_buff *skb;
1388                 int amount = 0;
1389                 /*
1390                  * These two are safe on a single CPU system as
1391                  * only user tasks fiddle here
1392                  */
1393                 lock_sock(sk);
1394                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1395                         amount = skb->len;
1396                 release_sock(sk);
1397                 rc = put_user(amount, (unsigned int __user *)argp);
1398                 break;
1399         }
1400
1401         case SIOCGSTAMP:
1402                 rc = -EINVAL;
1403                 if (sk)
1404                         rc = sock_get_timestamp(sk,
1405                                                 (struct timeval __user *)argp);
1406                 break;
1407         case SIOCGSTAMPNS:
1408                 rc = -EINVAL;
1409                 if (sk)
1410                         rc = sock_get_timestampns(sk,
1411                                         (struct timespec __user *)argp);
1412                 break;
1413         case SIOCGIFADDR:
1414         case SIOCSIFADDR:
1415         case SIOCGIFDSTADDR:
1416         case SIOCSIFDSTADDR:
1417         case SIOCGIFBRDADDR:
1418         case SIOCSIFBRDADDR:
1419         case SIOCGIFNETMASK:
1420         case SIOCSIFNETMASK:
1421         case SIOCGIFMETRIC:
1422         case SIOCSIFMETRIC:
1423                 rc = -EINVAL;
1424                 break;
1425         case SIOCADDRT:
1426         case SIOCDELRT:
1427                 rc = -EPERM;
1428                 if (!capable(CAP_NET_ADMIN))
1429                         break;
1430                 rc = x25_route_ioctl(cmd, argp);
1431                 break;
1432         case SIOCX25GSUBSCRIP:
1433                 rc = x25_subscr_ioctl(cmd, argp);
1434                 break;
1435         case SIOCX25SSUBSCRIP:
1436                 rc = -EPERM;
1437                 if (!capable(CAP_NET_ADMIN))
1438                         break;
1439                 rc = x25_subscr_ioctl(cmd, argp);
1440                 break;
1441         case SIOCX25GFACILITIES: {
1442                 lock_sock(sk);
1443                 rc = copy_to_user(argp, &x25->facilities,
1444                                   sizeof(x25->facilities))
1445                         ? -EFAULT : 0;
1446                 release_sock(sk);
1447                 break;
1448         }
1449
1450         case SIOCX25SFACILITIES: {
1451                 struct x25_facilities facilities;
1452                 rc = -EFAULT;
1453                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1454                         break;
1455                 rc = -EINVAL;
1456                 lock_sock(sk);
1457                 if (sk->sk_state != TCP_LISTEN &&
1458                     sk->sk_state != TCP_CLOSE)
1459                         goto out_fac_release;
1460                 if (facilities.pacsize_in < X25_PS16 ||
1461                     facilities.pacsize_in > X25_PS4096)
1462                         goto out_fac_release;
1463                 if (facilities.pacsize_out < X25_PS16 ||
1464                     facilities.pacsize_out > X25_PS4096)
1465                         goto out_fac_release;
1466                 if (facilities.winsize_in < 1 ||
1467                     facilities.winsize_in > 127)
1468                         goto out_fac_release;
1469                 if (facilities.throughput) {
1470                         int out = facilities.throughput & 0xf0;
1471                         int in  = facilities.throughput & 0x0f;
1472                         if (!out)
1473                                 facilities.throughput |=
1474                                         X25_DEFAULT_THROUGHPUT << 4;
1475                         else if (out < 0x30 || out > 0xD0)
1476                                 goto out_fac_release;
1477                         if (!in)
1478                                 facilities.throughput |=
1479                                         X25_DEFAULT_THROUGHPUT;
1480                         else if (in < 0x03 || in > 0x0D)
1481                                 goto out_fac_release;
1482                 }
1483                 if (facilities.reverse &&
1484                     (facilities.reverse & 0x81) != 0x81)
1485                         goto out_fac_release;
1486                 x25->facilities = facilities;
1487                 rc = 0;
1488 out_fac_release:
1489                 release_sock(sk);
1490                 break;
1491         }
1492
1493         case SIOCX25GDTEFACILITIES: {
1494                 lock_sock(sk);
1495                 rc = copy_to_user(argp, &x25->dte_facilities,
1496                                   sizeof(x25->dte_facilities));
1497                 release_sock(sk);
1498                 if (rc)
1499                         rc = -EFAULT;
1500                 break;
1501         }
1502
1503         case SIOCX25SDTEFACILITIES: {
1504                 struct x25_dte_facilities dtefacs;
1505                 rc = -EFAULT;
1506                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1507                         break;
1508                 rc = -EINVAL;
1509                 lock_sock(sk);
1510                 if (sk->sk_state != TCP_LISTEN &&
1511                     sk->sk_state != TCP_CLOSE)
1512                         goto out_dtefac_release;
1513                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1514                         goto out_dtefac_release;
1515                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1516                         goto out_dtefac_release;
1517                 x25->dte_facilities = dtefacs;
1518                 rc = 0;
1519 out_dtefac_release:
1520                 release_sock(sk);
1521                 break;
1522         }
1523
1524         case SIOCX25GCALLUSERDATA: {
1525                 lock_sock(sk);
1526                 rc = copy_to_user(argp, &x25->calluserdata,
1527                                   sizeof(x25->calluserdata))
1528                         ? -EFAULT : 0;
1529                 release_sock(sk);
1530                 break;
1531         }
1532
1533         case SIOCX25SCALLUSERDATA: {
1534                 struct x25_calluserdata calluserdata;
1535
1536                 rc = -EFAULT;
1537                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1538                         break;
1539                 rc = -EINVAL;
1540                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1541                         break;
1542                 lock_sock(sk);
1543                 x25->calluserdata = calluserdata;
1544                 release_sock(sk);
1545                 rc = 0;
1546                 break;
1547         }
1548
1549         case SIOCX25GCAUSEDIAG: {
1550                 lock_sock(sk);
1551                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1552                         ? -EFAULT : 0;
1553                 release_sock(sk);
1554                 break;
1555         }
1556
1557         case SIOCX25SCAUSEDIAG: {
1558                 struct x25_causediag causediag;
1559                 rc = -EFAULT;
1560                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1561                         break;
1562                 lock_sock(sk);
1563                 x25->causediag = causediag;
1564                 release_sock(sk);
1565                 rc = 0;
1566                 break;
1567
1568         }
1569
1570         case SIOCX25SCUDMATCHLEN: {
1571                 struct x25_subaddr sub_addr;
1572                 rc = -EINVAL;
1573                 lock_sock(sk);
1574                 if(sk->sk_state != TCP_CLOSE)
1575                         goto out_cud_release;
1576                 rc = -EFAULT;
1577                 if (copy_from_user(&sub_addr, argp,
1578                                    sizeof(sub_addr)))
1579                         goto out_cud_release;
1580                 rc = -EINVAL;
1581                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1582                         goto out_cud_release;
1583                 x25->cudmatchlength = sub_addr.cudmatchlength;
1584                 rc = 0;
1585 out_cud_release:
1586                 release_sock(sk);
1587                 break;
1588         }
1589
1590         case SIOCX25CALLACCPTAPPRV: {
1591                 rc = -EINVAL;
1592                 lock_sock(sk);
1593                 if (sk->sk_state == TCP_CLOSE) {
1594                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1595                         rc = 0;
1596                 }
1597                 release_sock(sk);
1598                 break;
1599         }
1600
1601         case SIOCX25SENDCALLACCPT:  {
1602                 rc = -EINVAL;
1603                 lock_sock(sk);
1604                 if (sk->sk_state != TCP_ESTABLISHED)
1605                         goto out_sendcallaccpt_release;
1606                 /* must call accptapprv above */
1607                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1608                         goto out_sendcallaccpt_release;
1609                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1610                 x25->state = X25_STATE_3;
1611                 rc = 0;
1612 out_sendcallaccpt_release:
1613                 release_sock(sk);
1614                 break;
1615         }
1616
1617         default:
1618                 rc = -ENOIOCTLCMD;
1619                 break;
1620         }
1621
1622         return rc;
1623 }
1624
1625 static const struct net_proto_family x25_family_ops = {
1626         .family =       AF_X25,
1627         .create =       x25_create,
1628         .owner  =       THIS_MODULE,
1629 };
1630
1631 #ifdef CONFIG_COMPAT
1632 static int compat_x25_subscr_ioctl(unsigned int cmd,
1633                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1634 {
1635         struct compat_x25_subscrip_struct x25_subscr;
1636         struct x25_neigh *nb;
1637         struct net_device *dev;
1638         int rc = -EINVAL;
1639
1640         rc = -EFAULT;
1641         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1642                 goto out;
1643
1644         rc = -EINVAL;
1645         dev = x25_dev_get(x25_subscr.device);
1646         if (dev == NULL)
1647                 goto out;
1648
1649         nb = x25_get_neigh(dev);
1650         if (nb == NULL)
1651                 goto out_dev_put;
1652
1653         dev_put(dev);
1654
1655         if (cmd == SIOCX25GSUBSCRIP) {
1656                 read_lock_bh(&x25_neigh_list_lock);
1657                 x25_subscr.extended = nb->extended;
1658                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1659                 read_unlock_bh(&x25_neigh_list_lock);
1660                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1661                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1662         } else {
1663                 rc = -EINVAL;
1664                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1665                         rc = 0;
1666                         write_lock_bh(&x25_neigh_list_lock);
1667                         nb->extended = x25_subscr.extended;
1668                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1669                         write_unlock_bh(&x25_neigh_list_lock);
1670                 }
1671         }
1672         x25_neigh_put(nb);
1673 out:
1674         return rc;
1675 out_dev_put:
1676         dev_put(dev);
1677         goto out;
1678 }
1679
1680 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1681                                 unsigned long arg)
1682 {
1683         void __user *argp = compat_ptr(arg);
1684         struct sock *sk = sock->sk;
1685
1686         int rc = -ENOIOCTLCMD;
1687
1688         switch(cmd) {
1689         case TIOCOUTQ:
1690         case TIOCINQ:
1691                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1692                 break;
1693         case SIOCGSTAMP:
1694                 rc = -EINVAL;
1695                 if (sk)
1696                         rc = compat_sock_get_timestamp(sk,
1697                                         (struct timeval __user*)argp);
1698                 break;
1699         case SIOCGSTAMPNS:
1700                 rc = -EINVAL;
1701                 if (sk)
1702                         rc = compat_sock_get_timestampns(sk,
1703                                         (struct timespec __user*)argp);
1704                 break;
1705         case SIOCGIFADDR:
1706         case SIOCSIFADDR:
1707         case SIOCGIFDSTADDR:
1708         case SIOCSIFDSTADDR:
1709         case SIOCGIFBRDADDR:
1710         case SIOCSIFBRDADDR:
1711         case SIOCGIFNETMASK:
1712         case SIOCSIFNETMASK:
1713         case SIOCGIFMETRIC:
1714         case SIOCSIFMETRIC:
1715                 rc = -EINVAL;
1716                 break;
1717         case SIOCADDRT:
1718         case SIOCDELRT:
1719                 rc = -EPERM;
1720                 if (!capable(CAP_NET_ADMIN))
1721                         break;
1722                 rc = x25_route_ioctl(cmd, argp);
1723                 break;
1724         case SIOCX25GSUBSCRIP:
1725                 rc = compat_x25_subscr_ioctl(cmd, argp);
1726                 break;
1727         case SIOCX25SSUBSCRIP:
1728                 rc = -EPERM;
1729                 if (!capable(CAP_NET_ADMIN))
1730                         break;
1731                 rc = compat_x25_subscr_ioctl(cmd, argp);
1732                 break;
1733         case SIOCX25GFACILITIES:
1734         case SIOCX25SFACILITIES:
1735         case SIOCX25GDTEFACILITIES:
1736         case SIOCX25SDTEFACILITIES:
1737         case SIOCX25GCALLUSERDATA:
1738         case SIOCX25SCALLUSERDATA:
1739         case SIOCX25GCAUSEDIAG:
1740         case SIOCX25SCAUSEDIAG:
1741         case SIOCX25SCUDMATCHLEN:
1742         case SIOCX25CALLACCPTAPPRV:
1743         case SIOCX25SENDCALLACCPT:
1744                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1745                 break;
1746         default:
1747                 rc = -ENOIOCTLCMD;
1748                 break;
1749         }
1750         return rc;
1751 }
1752 #endif
1753
1754 static const struct proto_ops x25_proto_ops = {
1755         .family =       AF_X25,
1756         .owner =        THIS_MODULE,
1757         .release =      x25_release,
1758         .bind =         x25_bind,
1759         .connect =      x25_connect,
1760         .socketpair =   sock_no_socketpair,
1761         .accept =       x25_accept,
1762         .getname =      x25_getname,
1763         .poll =         datagram_poll,
1764         .ioctl =        x25_ioctl,
1765 #ifdef CONFIG_COMPAT
1766         .compat_ioctl = compat_x25_ioctl,
1767 #endif
1768         .listen =       x25_listen,
1769         .shutdown =     sock_no_shutdown,
1770         .setsockopt =   x25_setsockopt,
1771         .getsockopt =   x25_getsockopt,
1772         .sendmsg =      x25_sendmsg,
1773         .recvmsg =      x25_recvmsg,
1774         .mmap =         sock_no_mmap,
1775         .sendpage =     sock_no_sendpage,
1776 };
1777
1778 static struct packet_type x25_packet_type __read_mostly = {
1779         .type = cpu_to_be16(ETH_P_X25),
1780         .func = x25_lapb_receive_frame,
1781 };
1782
1783 static struct notifier_block x25_dev_notifier = {
1784         .notifier_call = x25_device_event,
1785 };
1786
1787 void x25_kill_by_neigh(struct x25_neigh *nb)
1788 {
1789         struct sock *s;
1790
1791         write_lock_bh(&x25_list_lock);
1792
1793         sk_for_each(s, &x25_list)
1794                 if (x25_sk(s)->neighbour == nb)
1795                         x25_disconnect(s, ENETUNREACH, 0, 0);
1796
1797         write_unlock_bh(&x25_list_lock);
1798
1799         /* Remove any related forwards */
1800         x25_clear_forward_by_dev(nb->dev);
1801 }
1802
1803 static int __init x25_init(void)
1804 {
1805         int rc;
1806
1807         rc = proto_register(&x25_proto, 0);
1808         if (rc)
1809                 goto out;
1810
1811         rc = sock_register(&x25_family_ops);
1812         if (rc)
1813                 goto out_proto;
1814
1815         dev_add_pack(&x25_packet_type);
1816
1817         rc = register_netdevice_notifier(&x25_dev_notifier);
1818         if (rc)
1819                 goto out_sock;
1820
1821         rc = x25_register_sysctl();
1822         if (rc)
1823                 goto out_dev;
1824
1825         rc = x25_proc_init();
1826         if (rc)
1827                 goto out_sysctl;
1828
1829         pr_info("Linux Version 0.2\n");
1830
1831 out:
1832         return rc;
1833 out_sysctl:
1834         x25_unregister_sysctl();
1835 out_dev:
1836         unregister_netdevice_notifier(&x25_dev_notifier);
1837 out_sock:
1838         dev_remove_pack(&x25_packet_type);
1839         sock_unregister(AF_X25);
1840 out_proto:
1841         proto_unregister(&x25_proto);
1842         goto out;
1843 }
1844 module_init(x25_init);
1845
1846 static void __exit x25_exit(void)
1847 {
1848         x25_proc_exit();
1849         x25_link_free();
1850         x25_route_free();
1851
1852         x25_unregister_sysctl();
1853
1854         unregister_netdevice_notifier(&x25_dev_notifier);
1855
1856         dev_remove_pack(&x25_packet_type);
1857
1858         sock_unregister(AF_X25);
1859         proto_unregister(&x25_proto);
1860 }
1861 module_exit(x25_exit);
1862
1863 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1864 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1865 MODULE_LICENSE("GPL");
1866 MODULE_ALIAS_NETPROTO(PF_X25);