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                 x25_neigh_put(x25->neighbour);
 825 out_put_route:
 826         x25_route_put(rt);
 827 out:
 828         release_sock(sk);
 829         return rc;
 830 }
 831
 832 static int x25_wait_for_data(struct sock *sk, long timeout)
 833 {
 834         DECLARE_WAITQUEUE(wait, current);
 835         int rc = 0;
 836
 837         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 838         for (;;) {
 839                 __set_current_state(TASK_INTERRUPTIBLE);
 840                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 841                         break;
 842                 rc = -ERESTARTSYS;
 843                 if (signal_pending(current))
 844                         break;
 845                 rc = -EAGAIN;
 846                 if (!timeout)
 847                         break;
 848                 rc = 0;
 849                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 850                         release_sock(sk);
 851                         timeout = schedule_timeout(timeout);
 852                         lock_sock(sk);
 853                 } else
 854                         break;
 855         }
 856         __set_current_state(TASK_RUNNING);
 857         remove_wait_queue(sk_sleep(sk), &wait);
 858         return rc;
 859 }
 860
 861 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 862                       bool kern)
 863 {
 864         struct sock *sk = sock->sk;
 865         struct sock *newsk;
 866         struct sk_buff *skb;
 867         int rc = -EINVAL;
 868
 869         if (!sk)
 870                 goto out;
 871
 872         rc = -EOPNOTSUPP;
 873         if (sk->sk_type != SOCK_SEQPACKET)
 874                 goto out;
 875
 876         lock_sock(sk);
 877         rc = -EINVAL;
 878         if (sk->sk_state != TCP_LISTEN)
 879                 goto out2;
 880
 881         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 882         if (rc)
 883                 goto out2;
 884         skb = skb_dequeue(&sk->sk_receive_queue);
 885         rc = -EINVAL;
 886         if (!skb->sk)
 887                 goto out2;
 888         newsk            = skb->sk;
 889         sock_graft(newsk, newsock);
 890
 891         /* Now attach up the new socket */
 892         skb->sk = NULL;
 893         kfree_skb(skb);
 894         sk->sk_ack_backlog--;
 895         newsock->state = SS_CONNECTED;
 896         rc = 0;
 897 out2:
 898         release_sock(sk);
 899 out:
 900         return rc;
 901 }
 902
 903 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 904                        int peer)
 905 {
 906         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 907         struct sock *sk = sock->sk;
 908         struct x25_sock *x25 = x25_sk(sk);
 909         int rc = 0;
 910
 911         if (peer) {
 912                 if (sk->sk_state != TCP_ESTABLISHED) {
 913                         rc = -ENOTCONN;
 914                         goto out;
 915                 }
 916                 sx25->sx25_addr = x25->dest_addr;
 917         } else
 918                 sx25->sx25_addr = x25->source_addr;
 919
 920         sx25->sx25_family = AF_X25;
 921         rc = sizeof(*sx25);
 922
 923 out:
 924         return rc;
 925 }
 926
 927 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 928                         unsigned int lci)
 929 {
 930         struct sock *sk;
 931         struct sock *make;
 932         struct x25_sock *makex25;
 933         struct x25_address source_addr, dest_addr;
 934         struct x25_facilities facilities;
 935         struct x25_dte_facilities dte_facilities;
 936         int len, addr_len, rc;
 937
 938         /*
 939          *      Remove the LCI and frame type.
 940          */
 941         skb_pull(skb, X25_STD_MIN_LEN);
 942
 943         /*
 944          *      Extract the X.25 addresses and convert them to ASCII strings,
 945          *      and remove them.
 946          *
 947          *      Address block is mandatory in call request packets
 948          */
 949         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 950         if (addr_len <= 0)
 951                 goto out_clear_request;
 952         skb_pull(skb, addr_len);
 953
 954         /*
 955          *      Get the length of the facilities, skip past them for the moment
 956          *      get the call user data because this is needed to determine
 957          *      the correct listener
 958          *
 959          *      Facilities length is mandatory in call request packets
 960          */
 961         if (!pskb_may_pull(skb, 1))
 962                 goto out_clear_request;
 963         len = skb->data[0] + 1;
 964         if (!pskb_may_pull(skb, len))
 965                 goto out_clear_request;
 966         skb_pull(skb,len);
 967
 968         /*
 969          *      Ensure that the amount of call user data is valid.
 970          */
 971         if (skb->len > X25_MAX_CUD_LEN)
 972                 goto out_clear_request;
 973
 974         /*
 975          *      Get all the call user data so it can be used in
 976          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 977          */
 978         if (!pskb_may_pull(skb, skb->len))
 979                 goto out_clear_request;
 980
 981         /*
 982          *      Find a listener for the particular address/cud pair.
 983          */
 984         sk = x25_find_listener(&source_addr,skb);
 985         skb_push(skb,len);
 986
 987         if (sk != NULL && sk_acceptq_is_full(sk)) {
 988                 goto out_sock_put;
 989         }
 990
 991         /*
 992          *      We dont have any listeners for this incoming call.
 993          *      Try forwarding it.
 994          */
 995         if (sk == NULL) {
 996                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 997                 if (sysctl_x25_forward &&
 998                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 999                 {
1000                         /* Call was forwarded, dont process it any more */
1001                         kfree_skb(skb);
1002                         rc = 1;
1003                         goto out;
1004                 } else {
1005                         /* No listeners, can't forward, clear the call */
1006                         goto out_clear_request;
1007                 }
1008         }
1009
1010         /*
1011          *      Try to reach a compromise on the requested facilities.
1012          */
1013         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1014         if (len == -1)
1015                 goto out_sock_put;
1016
1017         /*
1018          * current neighbour/link might impose additional limits
1019          * on certain facilties
1020          */
1021
1022         x25_limit_facilities(&facilities, nb);
1023
1024         /*
1025          *      Try to create a new socket.
1026          */
1027         make = x25_make_new(sk);
1028         if (!make)
1029                 goto out_sock_put;
1030
1031         /*
1032          *      Remove the facilities
1033          */
1034         skb_pull(skb, len);
1035
1036         skb->sk     = make;
1037         make->sk_state = TCP_ESTABLISHED;
1038
1039         makex25 = x25_sk(make);
1040         makex25->lci           = lci;
1041         makex25->dest_addr     = dest_addr;
1042         makex25->source_addr   = source_addr;
1043         makex25->neighbour     = nb;
1044         makex25->facilities    = facilities;
1045         makex25->dte_facilities= dte_facilities;
1046         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1047         /* ensure no reverse facil on accept */
1048         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1049         /* ensure no calling address extension on accept */
1050         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1051         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1052
1053         /* Normally all calls are accepted immediately */
1054         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1055                 x25_write_internal(make, X25_CALL_ACCEPTED);
1056                 makex25->state = X25_STATE_3;
1057         }
1058
1059         /*
1060          *      Incoming Call User Data.
1061          */
1062         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1063         makex25->calluserdata.cudlength = skb->len;
1064
1065         sk->sk_ack_backlog++;
1066
1067         x25_insert_socket(make);
1068
1069         skb_queue_head(&sk->sk_receive_queue, skb);
1070
1071         x25_start_heartbeat(make);
1072
1073         if (!sock_flag(sk, SOCK_DEAD))
1074                 sk->sk_data_ready(sk);
1075         rc = 1;
1076         sock_put(sk);
1077 out:
1078         return rc;
1079 out_sock_put:
1080         sock_put(sk);
1081 out_clear_request:
1082         rc = 0;
1083         x25_transmit_clear_request(nb, lci, 0x01);
1084         goto out;
1085 }
1086
1087 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1088 {
1089         struct sock *sk = sock->sk;
1090         struct x25_sock *x25 = x25_sk(sk);
1091         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1092         struct sockaddr_x25 sx25;
1093         struct sk_buff *skb;
1094         unsigned char *asmptr;
1095         int noblock = msg->msg_flags & MSG_DONTWAIT;
1096         size_t size;
1097         int qbit = 0, rc = -EINVAL;
1098
1099         lock_sock(sk);
1100         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1101                 goto out;
1102
1103         /* we currently don't support segmented records at the user interface */
1104         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1105                 goto out;
1106
1107         rc = -EADDRNOTAVAIL;
1108         if (sock_flag(sk, SOCK_ZAPPED))
1109                 goto out;
1110
1111         rc = -EPIPE;
1112         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1113                 send_sig(SIGPIPE, current, 0);
1114                 goto out;
1115         }
1116
1117         rc = -ENETUNREACH;
1118         if (!x25->neighbour)
1119                 goto out;
1120
1121         if (usx25) {
1122                 rc = -EINVAL;
1123                 if (msg->msg_namelen < sizeof(sx25))
1124                         goto out;
1125                 memcpy(&sx25, usx25, sizeof(sx25));
1126                 rc = -EISCONN;
1127                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1128                         goto out;
1129                 rc = -EINVAL;
1130                 if (sx25.sx25_family != AF_X25)
1131                         goto out;
1132         } else {
1133                 /*
1134                  *      FIXME 1003.1g - if the socket is like this because
1135                  *      it has become closed (not started closed) we ought
1136                  *      to SIGPIPE, EPIPE;
1137                  */
1138                 rc = -ENOTCONN;
1139                 if (sk->sk_state != TCP_ESTABLISHED)
1140                         goto out;
1141
1142                 sx25.sx25_family = AF_X25;
1143                 sx25.sx25_addr   = x25->dest_addr;
1144         }
1145
1146         /* Sanity check the packet size */
1147         if (len > 65535) {
1148                 rc = -EMSGSIZE;
1149                 goto out;
1150         }
1151
1152         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1153
1154         /* Build a packet */
1155         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1156
1157         if ((msg->msg_flags & MSG_OOB) && len > 32)
1158                 len = 32;
1159
1160         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1161
1162         release_sock(sk);
1163         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1164         lock_sock(sk);
1165         if (!skb)
1166                 goto out;
1167         X25_SKB_CB(skb)->flags = msg->msg_flags;
1168
1169         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1170
1171         /*
1172          *      Put the data on the end
1173          */
1174         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1175
1176         skb_reset_transport_header(skb);
1177         skb_put(skb, len);
1178
1179         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1180         if (rc)
1181                 goto out_kfree_skb;
1182
1183         /*
1184          *      If the Q BIT Include socket option is in force, the first
1185          *      byte of the user data is the logical value of the Q Bit.
1186          */
1187         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1188                 if (!pskb_may_pull(skb, 1))
1189                         goto out_kfree_skb;
1190
1191                 qbit = skb->data[0];
1192                 skb_pull(skb, 1);
1193         }
1194
1195         /*
1196          *      Push down the X.25 header
1197          */
1198         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1199
1200         if (msg->msg_flags & MSG_OOB) {
1201                 if (x25->neighbour->extended) {
1202                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1203                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1204                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1205                         *asmptr++ = X25_INTERRUPT;
1206                 } else {
1207                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1208                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1209                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1210                         *asmptr++ = X25_INTERRUPT;
1211                 }
1212         } else {
1213                 if (x25->neighbour->extended) {
1214                         /* Build an Extended X.25 header */
1215                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1216                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1217                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1218                         *asmptr++ = X25_DATA;
1219                         *asmptr++ = X25_DATA;
1220                 } else {
1221                         /* Build an Standard X.25 header */
1222                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1223                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1224                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1225                         *asmptr++ = X25_DATA;
1226                 }
1227
1228                 if (qbit)
1229                         skb->data[0] |= X25_Q_BIT;
1230         }
1231
1232         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1233         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1234
1235         rc = -ENOTCONN;
1236         if (sk->sk_state != TCP_ESTABLISHED)
1237                 goto out_kfree_skb;
1238
1239         if (msg->msg_flags & MSG_OOB)
1240                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1241         else {
1242                 rc = x25_output(sk, skb);
1243                 len = rc;
1244                 if (rc < 0)
1245                         kfree_skb(skb);
1246                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1247                         len++;
1248         }
1249
1250         x25_kick(sk);
1251         rc = len;
1252 out:
1253         release_sock(sk);
1254         return rc;
1255 out_kfree_skb:
1256         kfree_skb(skb);
1257         goto out;
1258 }
1259
1260
1261 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1262                        int flags)
1263 {
1264         struct sock *sk = sock->sk;
1265         struct x25_sock *x25 = x25_sk(sk);
1266         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1267         size_t copied;
1268         int qbit, header_len;
1269         struct sk_buff *skb;
1270         unsigned char *asmptr;
1271         int rc = -ENOTCONN;
1272
1273         lock_sock(sk);
1274
1275         if (x25->neighbour == NULL)
1276                 goto out;
1277
1278         header_len = x25->neighbour->extended ?
1279                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1280
1281         /*
1282          * This works for seqpacket too. The receiver has ordered the queue for
1283          * us! We do one quick check first though
1284          */
1285         if (sk->sk_state != TCP_ESTABLISHED)
1286                 goto out;
1287
1288         if (flags & MSG_OOB) {
1289                 rc = -EINVAL;
1290                 if (sock_flag(sk, SOCK_URGINLINE) ||
1291                     !skb_peek(&x25->interrupt_in_queue))
1292                         goto out;
1293
1294                 skb = skb_dequeue(&x25->interrupt_in_queue);
1295
1296                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1297                         goto out_free_dgram;
1298
1299                 skb_pull(skb, X25_STD_MIN_LEN);
1300
1301                 /*
1302                  *      No Q bit information on Interrupt data.
1303                  */
1304                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1305                         asmptr  = skb_push(skb, 1);
1306                         *asmptr = 0x00;
1307                 }
1308
1309                 msg->msg_flags |= MSG_OOB;
1310         } else {
1311                 /* Now we can treat all alike */
1312                 release_sock(sk);
1313                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1314                                         flags & MSG_DONTWAIT, &rc);
1315                 lock_sock(sk);
1316                 if (!skb)
1317                         goto out;
1318
1319                 if (!pskb_may_pull(skb, header_len))
1320                         goto out_free_dgram;
1321
1322                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1323
1324                 skb_pull(skb, header_len);
1325
1326                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1327                         asmptr  = skb_push(skb, 1);
1328                         *asmptr = qbit;
1329                 }
1330         }
1331
1332         skb_reset_transport_header(skb);
1333         copied = skb->len;
1334
1335         if (copied > size) {
1336                 copied = size;
1337                 msg->msg_flags |= MSG_TRUNC;
1338         }
1339
1340         /* Currently, each datagram always contains a complete record */
1341         msg->msg_flags |= MSG_EOR;
1342
1343         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1344         if (rc)
1345                 goto out_free_dgram;
1346
1347         if (sx25) {
1348                 sx25->sx25_family = AF_X25;
1349                 sx25->sx25_addr   = x25->dest_addr;
1350                 msg->msg_namelen = sizeof(*sx25);
1351         }
1352
1353         x25_check_rbuf(sk);
1354         rc = copied;
1355 out_free_dgram:
1356         skb_free_datagram(sk, skb);
1357 out:
1358         release_sock(sk);
1359         return rc;
1360 }
1361
1362
1363 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1364 {
1365         struct sock *sk = sock->sk;
1366         struct x25_sock *x25 = x25_sk(sk);
1367         void __user *argp = (void __user *)arg;
1368         int rc;
1369
1370         switch (cmd) {
1371         case TIOCOUTQ: {
1372                 int amount;
1373
1374                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1375                 if (amount < 0)
1376                         amount = 0;
1377                 rc = put_user(amount, (unsigned int __user *)argp);
1378                 break;
1379         }
1380
1381         case TIOCINQ: {
1382                 struct sk_buff *skb;
1383                 int amount = 0;
1384                 /*
1385                  * These two are safe on a single CPU system as
1386                  * only user tasks fiddle here
1387                  */
1388                 lock_sock(sk);
1389                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1390                         amount = skb->len;
1391                 release_sock(sk);
1392                 rc = put_user(amount, (unsigned int __user *)argp);
1393                 break;
1394         }
1395
1396         case SIOCGSTAMP:
1397                 rc = -EINVAL;
1398                 if (sk)
1399                         rc = sock_get_timestamp(sk,
1400                                                 (struct timeval __user *)argp);
1401                 break;
1402         case SIOCGSTAMPNS:
1403                 rc = -EINVAL;
1404                 if (sk)
1405                         rc = sock_get_timestampns(sk,
1406                                         (struct timespec __user *)argp);
1407                 break;
1408         case SIOCGIFADDR:
1409         case SIOCSIFADDR:
1410         case SIOCGIFDSTADDR:
1411         case SIOCSIFDSTADDR:
1412         case SIOCGIFBRDADDR:
1413         case SIOCSIFBRDADDR:
1414         case SIOCGIFNETMASK:
1415         case SIOCSIFNETMASK:
1416         case SIOCGIFMETRIC:
1417         case SIOCSIFMETRIC:
1418                 rc = -EINVAL;
1419                 break;
1420         case SIOCADDRT:
1421         case SIOCDELRT:
1422                 rc = -EPERM;
1423                 if (!capable(CAP_NET_ADMIN))
1424                         break;
1425                 rc = x25_route_ioctl(cmd, argp);
1426                 break;
1427         case SIOCX25GSUBSCRIP:
1428                 rc = x25_subscr_ioctl(cmd, argp);
1429                 break;
1430         case SIOCX25SSUBSCRIP:
1431                 rc = -EPERM;
1432                 if (!capable(CAP_NET_ADMIN))
1433                         break;
1434                 rc = x25_subscr_ioctl(cmd, argp);
1435                 break;
1436         case SIOCX25GFACILITIES: {
1437                 lock_sock(sk);
1438                 rc = copy_to_user(argp, &x25->facilities,
1439                                   sizeof(x25->facilities))
1440                         ? -EFAULT : 0;
1441                 release_sock(sk);
1442                 break;
1443         }
1444
1445         case SIOCX25SFACILITIES: {
1446                 struct x25_facilities facilities;
1447                 rc = -EFAULT;
1448                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1449                         break;
1450                 rc = -EINVAL;
1451                 lock_sock(sk);
1452                 if (sk->sk_state != TCP_LISTEN &&
1453                     sk->sk_state != TCP_CLOSE)
1454                         goto out_fac_release;
1455                 if (facilities.pacsize_in < X25_PS16 ||
1456                     facilities.pacsize_in > X25_PS4096)
1457                         goto out_fac_release;
1458                 if (facilities.pacsize_out < X25_PS16 ||
1459                     facilities.pacsize_out > X25_PS4096)
1460                         goto out_fac_release;
1461                 if (facilities.winsize_in < 1 ||
1462                     facilities.winsize_in > 127)
1463                         goto out_fac_release;
1464                 if (facilities.throughput) {
1465                         int out = facilities.throughput & 0xf0;
1466                         int in  = facilities.throughput & 0x0f;
1467                         if (!out)
1468                                 facilities.throughput |=
1469                                         X25_DEFAULT_THROUGHPUT << 4;
1470                         else if (out < 0x30 || out > 0xD0)
1471                                 goto out_fac_release;
1472                         if (!in)
1473                                 facilities.throughput |=
1474                                         X25_DEFAULT_THROUGHPUT;
1475                         else if (in < 0x03 || in > 0x0D)
1476                                 goto out_fac_release;
1477                 }
1478                 if (facilities.reverse &&
1479                     (facilities.reverse & 0x81) != 0x81)
1480                         goto out_fac_release;
1481                 x25->facilities = facilities;
1482                 rc = 0;
1483 out_fac_release:
1484                 release_sock(sk);
1485                 break;
1486         }
1487
1488         case SIOCX25GDTEFACILITIES: {
1489                 lock_sock(sk);
1490                 rc = copy_to_user(argp, &x25->dte_facilities,
1491                                   sizeof(x25->dte_facilities));
1492                 release_sock(sk);
1493                 if (rc)
1494                         rc = -EFAULT;
1495                 break;
1496         }
1497
1498         case SIOCX25SDTEFACILITIES: {
1499                 struct x25_dte_facilities dtefacs;
1500                 rc = -EFAULT;
1501                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1502                         break;
1503                 rc = -EINVAL;
1504                 lock_sock(sk);
1505                 if (sk->sk_state != TCP_LISTEN &&
1506                     sk->sk_state != TCP_CLOSE)
1507                         goto out_dtefac_release;
1508                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1509                         goto out_dtefac_release;
1510                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1511                         goto out_dtefac_release;
1512                 x25->dte_facilities = dtefacs;
1513                 rc = 0;
1514 out_dtefac_release:
1515                 release_sock(sk);
1516                 break;
1517         }
1518
1519         case SIOCX25GCALLUSERDATA: {
1520                 lock_sock(sk);
1521                 rc = copy_to_user(argp, &x25->calluserdata,
1522                                   sizeof(x25->calluserdata))
1523                         ? -EFAULT : 0;
1524                 release_sock(sk);
1525                 break;
1526         }
1527
1528         case SIOCX25SCALLUSERDATA: {
1529                 struct x25_calluserdata calluserdata;
1530
1531                 rc = -EFAULT;
1532                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1533                         break;
1534                 rc = -EINVAL;
1535                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1536                         break;
1537                 lock_sock(sk);
1538                 x25->calluserdata = calluserdata;
1539                 release_sock(sk);
1540                 rc = 0;
1541                 break;
1542         }
1543
1544         case SIOCX25GCAUSEDIAG: {
1545                 lock_sock(sk);
1546                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1547                         ? -EFAULT : 0;
1548                 release_sock(sk);
1549                 break;
1550         }
1551
1552         case SIOCX25SCAUSEDIAG: {
1553                 struct x25_causediag causediag;
1554                 rc = -EFAULT;
1555                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1556                         break;
1557                 lock_sock(sk);
1558                 x25->causediag = causediag;
1559                 release_sock(sk);
1560                 rc = 0;
1561                 break;
1562
1563         }
1564
1565         case SIOCX25SCUDMATCHLEN: {
1566                 struct x25_subaddr sub_addr;
1567                 rc = -EINVAL;
1568                 lock_sock(sk);
1569                 if(sk->sk_state != TCP_CLOSE)
1570                         goto out_cud_release;
1571                 rc = -EFAULT;
1572                 if (copy_from_user(&sub_addr, argp,
1573                                    sizeof(sub_addr)))
1574                         goto out_cud_release;
1575                 rc = -EINVAL;
1576                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1577                         goto out_cud_release;
1578                 x25->cudmatchlength = sub_addr.cudmatchlength;
1579                 rc = 0;
1580 out_cud_release:
1581                 release_sock(sk);
1582                 break;
1583         }
1584
1585         case SIOCX25CALLACCPTAPPRV: {
1586                 rc = -EINVAL;
1587                 lock_sock(sk);
1588                 if (sk->sk_state == TCP_CLOSE) {
1589                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1590                         rc = 0;
1591                 }
1592                 release_sock(sk);
1593                 break;
1594         }
1595
1596         case SIOCX25SENDCALLACCPT:  {
1597                 rc = -EINVAL;
1598                 lock_sock(sk);
1599                 if (sk->sk_state != TCP_ESTABLISHED)
1600                         goto out_sendcallaccpt_release;
1601                 /* must call accptapprv above */
1602                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1603                         goto out_sendcallaccpt_release;
1604                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1605                 x25->state = X25_STATE_3;
1606                 rc = 0;
1607 out_sendcallaccpt_release:
1608                 release_sock(sk);
1609                 break;
1610         }
1611
1612         default:
1613                 rc = -ENOIOCTLCMD;
1614                 break;
1615         }
1616
1617         return rc;
1618 }
1619
1620 static const struct net_proto_family x25_family_ops = {
1621         .family =       AF_X25,
1622         .create =       x25_create,
1623         .owner  =       THIS_MODULE,
1624 };
1625
1626 #ifdef CONFIG_COMPAT
1627 static int compat_x25_subscr_ioctl(unsigned int cmd,
1628                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1629 {
1630         struct compat_x25_subscrip_struct x25_subscr;
1631         struct x25_neigh *nb;
1632         struct net_device *dev;
1633         int rc = -EINVAL;
1634
1635         rc = -EFAULT;
1636         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1637                 goto out;
1638
1639         rc = -EINVAL;
1640         dev = x25_dev_get(x25_subscr.device);
1641         if (dev == NULL)
1642                 goto out;
1643
1644         nb = x25_get_neigh(dev);
1645         if (nb == NULL)
1646                 goto out_dev_put;
1647
1648         dev_put(dev);
1649
1650         if (cmd == SIOCX25GSUBSCRIP) {
1651                 read_lock_bh(&x25_neigh_list_lock);
1652                 x25_subscr.extended = nb->extended;
1653                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1654                 read_unlock_bh(&x25_neigh_list_lock);
1655                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1656                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1657         } else {
1658                 rc = -EINVAL;
1659                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1660                         rc = 0;
1661                         write_lock_bh(&x25_neigh_list_lock);
1662                         nb->extended = x25_subscr.extended;
1663                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1664                         write_unlock_bh(&x25_neigh_list_lock);
1665                 }
1666         }
1667         x25_neigh_put(nb);
1668 out:
1669         return rc;
1670 out_dev_put:
1671         dev_put(dev);
1672         goto out;
1673 }
1674
1675 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1676                                 unsigned long arg)
1677 {
1678         void __user *argp = compat_ptr(arg);
1679         struct sock *sk = sock->sk;
1680
1681         int rc = -ENOIOCTLCMD;
1682
1683         switch(cmd) {
1684         case TIOCOUTQ:
1685         case TIOCINQ:
1686                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1687                 break;
1688         case SIOCGSTAMP:
1689                 rc = -EINVAL;
1690                 if (sk)
1691                         rc = compat_sock_get_timestamp(sk,
1692                                         (struct timeval __user*)argp);
1693                 break;
1694         case SIOCGSTAMPNS:
1695                 rc = -EINVAL;
1696                 if (sk)
1697                         rc = compat_sock_get_timestampns(sk,
1698                                         (struct timespec __user*)argp);
1699                 break;
1700         case SIOCGIFADDR:
1701         case SIOCSIFADDR:
1702         case SIOCGIFDSTADDR:
1703         case SIOCSIFDSTADDR:
1704         case SIOCGIFBRDADDR:
1705         case SIOCSIFBRDADDR:
1706         case SIOCGIFNETMASK:
1707         case SIOCSIFNETMASK:
1708         case SIOCGIFMETRIC:
1709         case SIOCSIFMETRIC:
1710                 rc = -EINVAL;
1711                 break;
1712         case SIOCADDRT:
1713         case SIOCDELRT:
1714                 rc = -EPERM;
1715                 if (!capable(CAP_NET_ADMIN))
1716                         break;
1717                 rc = x25_route_ioctl(cmd, argp);
1718                 break;
1719         case SIOCX25GSUBSCRIP:
1720                 rc = compat_x25_subscr_ioctl(cmd, argp);
1721                 break;
1722         case SIOCX25SSUBSCRIP:
1723                 rc = -EPERM;
1724                 if (!capable(CAP_NET_ADMIN))
1725                         break;
1726                 rc = compat_x25_subscr_ioctl(cmd, argp);
1727                 break;
1728         case SIOCX25GFACILITIES:
1729         case SIOCX25SFACILITIES:
1730         case SIOCX25GDTEFACILITIES:
1731         case SIOCX25SDTEFACILITIES:
1732         case SIOCX25GCALLUSERDATA:
1733         case SIOCX25SCALLUSERDATA:
1734         case SIOCX25GCAUSEDIAG:
1735         case SIOCX25SCAUSEDIAG:
1736         case SIOCX25SCUDMATCHLEN:
1737         case SIOCX25CALLACCPTAPPRV:
1738         case SIOCX25SENDCALLACCPT:
1739                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1740                 break;
1741         default:
1742                 rc = -ENOIOCTLCMD;
1743                 break;
1744         }
1745         return rc;
1746 }
1747 #endif
1748
1749 static const struct proto_ops x25_proto_ops = {
1750         .family =       AF_X25,
1751         .owner =        THIS_MODULE,
1752         .release =      x25_release,
1753         .bind =         x25_bind,
1754         .connect =      x25_connect,
1755         .socketpair =   sock_no_socketpair,
1756         .accept =       x25_accept,
1757         .getname =      x25_getname,
1758         .poll =         datagram_poll,
1759         .ioctl =        x25_ioctl,
1760 #ifdef CONFIG_COMPAT
1761         .compat_ioctl = compat_x25_ioctl,
1762 #endif
1763         .listen =       x25_listen,
1764         .shutdown =     sock_no_shutdown,
1765         .setsockopt =   x25_setsockopt,
1766         .getsockopt =   x25_getsockopt,
1767         .sendmsg =      x25_sendmsg,
1768         .recvmsg =      x25_recvmsg,
1769         .mmap =         sock_no_mmap,
1770         .sendpage =     sock_no_sendpage,
1771 };
1772
1773 static struct packet_type x25_packet_type __read_mostly = {
1774         .type = cpu_to_be16(ETH_P_X25),
1775         .func = x25_lapb_receive_frame,
1776 };
1777
1778 static struct notifier_block x25_dev_notifier = {
1779         .notifier_call = x25_device_event,
1780 };
1781
1782 void x25_kill_by_neigh(struct x25_neigh *nb)
1783 {
1784         struct sock *s;
1785
1786         write_lock_bh(&x25_list_lock);
1787
1788         sk_for_each(s, &x25_list)
1789                 if (x25_sk(s)->neighbour == nb)
1790                         x25_disconnect(s, ENETUNREACH, 0, 0);
1791
1792         write_unlock_bh(&x25_list_lock);
1793
1794         /* Remove any related forwards */
1795         x25_clear_forward_by_dev(nb->dev);
1796 }
1797
1798 static int __init x25_init(void)
1799 {
1800         int rc;
1801
1802         rc = proto_register(&x25_proto, 0);
1803         if (rc)
1804                 goto out;
1805
1806         rc = sock_register(&x25_family_ops);
1807         if (rc)
1808                 goto out_proto;
1809
1810         dev_add_pack(&x25_packet_type);
1811
1812         rc = register_netdevice_notifier(&x25_dev_notifier);
1813         if (rc)
1814                 goto out_sock;
1815
1816         rc = x25_register_sysctl();
1817         if (rc)
1818                 goto out_dev;
1819
1820         rc = x25_proc_init();
1821         if (rc)
1822                 goto out_sysctl;
1823
1824         pr_info("Linux Version 0.2\n");
1825
1826 out:
1827         return rc;
1828 out_sysctl:
1829         x25_unregister_sysctl();
1830 out_dev:
1831         unregister_netdevice_notifier(&x25_dev_notifier);
1832 out_sock:
1833         dev_remove_pack(&x25_packet_type);
1834         sock_unregister(AF_X25);
1835 out_proto:
1836         proto_unregister(&x25_proto);
1837         goto out;
1838 }
1839 module_init(x25_init);
1840
1841 static void __exit x25_exit(void)
1842 {
1843         x25_proc_exit();
1844         x25_link_free();
1845         x25_route_free();
1846
1847         x25_unregister_sysctl();
1848
1849         unregister_netdevice_notifier(&x25_dev_notifier);
1850
1851         dev_remove_pack(&x25_packet_type);
1852
1853         sock_unregister(AF_X25);
1854         proto_unregister(&x25_proto);
1855 }
1856 module_exit(x25_exit);
1857
1858 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1859 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1860 MODULE_LICENSE("GPL");
1861 MODULE_ALIAS_NETPROTO(PF_X25);