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(unsigned long data)
 376 {
 377         x25_destroy_socket_from_timer((struct sock *)data);
 378 }
 379
 380 /*
 381  *      This is called from user mode and the timers. Thus it protects itself
 382  *      against interrupt users but doesn't worry about being called during
 383  *      work. Once it is removed from the queue no interrupt or bottom half
 384  *      will touch it and we are (fairly 8-) ) safe.
 385  *      Not static as it's used by the timer
 386  */
 387 static void __x25_destroy_socket(struct sock *sk)
 388 {
 389         struct sk_buff *skb;
 390
 391         x25_stop_heartbeat(sk);
 392         x25_stop_timer(sk);
 393
 394         x25_remove_socket(sk);
 395         x25_clear_queues(sk);           /* Flush the queues */
 396
 397         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 398                 if (skb->sk != sk) {            /* A pending connection */
 399                         /*
 400                          * Queue the unaccepted socket for death
 401                          */
 402                         skb->sk->sk_state = TCP_LISTEN;
 403                         sock_set_flag(skb->sk, SOCK_DEAD);
 404                         x25_start_heartbeat(skb->sk);
 405                         x25_sk(skb->sk)->state = X25_STATE_0;
 406                 }
 407
 408                 kfree_skb(skb);
 409         }
 410
 411         if (sk_has_allocations(sk)) {
 412                 /* Defer: outstanding buffers */
 413                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 414                 sk->sk_timer.function = x25_destroy_timer;
 415                 sk->sk_timer.data = (unsigned long)sk;
 416                 add_timer(&sk->sk_timer);
 417         } else {
 418                 /* drop last reference so sock_put will free */
 419                 __sock_put(sk);
 420         }
 421 }
 422
 423 void x25_destroy_socket_from_timer(struct sock *sk)
 424 {
 425         sock_hold(sk);
 426         bh_lock_sock(sk);
 427         __x25_destroy_socket(sk);
 428         bh_unlock_sock(sk);
 429         sock_put(sk);
 430 }
 431
 432 /*
 433  *      Handling for system calls applied via the various interfaces to a
 434  *      X.25 socket object.
 435  */
 436
 437 static int x25_setsockopt(struct socket *sock, int level, int optname,
 438                           char __user *optval, unsigned int optlen)
 439 {
 440         int opt;
 441         struct sock *sk = sock->sk;
 442         int rc = -ENOPROTOOPT;
 443
 444         if (level != SOL_X25 || optname != X25_QBITINCL)
 445                 goto out;
 446
 447         rc = -EINVAL;
 448         if (optlen < sizeof(int))
 449                 goto out;
 450
 451         rc = -EFAULT;
 452         if (get_user(opt, (int __user *)optval))
 453                 goto out;
 454
 455         if (opt)
 456                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 457         else
 458                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 459         rc = 0;
 460 out:
 461         return rc;
 462 }
 463
 464 static int x25_getsockopt(struct socket *sock, int level, int optname,
 465                           char __user *optval, int __user *optlen)
 466 {
 467         struct sock *sk = sock->sk;
 468         int val, len, rc = -ENOPROTOOPT;
 469
 470         if (level != SOL_X25 || optname != X25_QBITINCL)
 471                 goto out;
 472
 473         rc = -EFAULT;
 474         if (get_user(len, optlen))
 475                 goto out;
 476
 477         len = min_t(unsigned int, len, sizeof(int));
 478
 479         rc = -EINVAL;
 480         if (len < 0)
 481                 goto out;
 482
 483         rc = -EFAULT;
 484         if (put_user(len, optlen))
 485                 goto out;
 486
 487         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 488         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 489 out:
 490         return rc;
 491 }
 492
 493 static int x25_listen(struct socket *sock, int backlog)
 494 {
 495         struct sock *sk = sock->sk;
 496         int rc = -EOPNOTSUPP;
 497
 498         lock_sock(sk);
 499         if (sock->state != SS_UNCONNECTED) {
 500                 rc = -EINVAL;
 501                 release_sock(sk);
 502                 return rc;
 503         }
 504
 505         if (sk->sk_state != TCP_LISTEN) {
 506                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 507                 sk->sk_max_ack_backlog = backlog;
 508                 sk->sk_state           = TCP_LISTEN;
 509                 rc = 0;
 510         }
 511         release_sock(sk);
 512
 513         return rc;
 514 }
 515
 516 static struct proto x25_proto = {
 517         .name     = "X25",
 518         .owner    = THIS_MODULE,
 519         .obj_size = sizeof(struct x25_sock),
 520 };
 521
 522 static struct sock *x25_alloc_socket(struct net *net, int kern)
 523 {
 524         struct x25_sock *x25;
 525         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 526
 527         if (!sk)
 528                 goto out;
 529
 530         sock_init_data(NULL, sk);
 531
 532         x25 = x25_sk(sk);
 533         skb_queue_head_init(&x25->ack_queue);
 534         skb_queue_head_init(&x25->fragment_queue);
 535         skb_queue_head_init(&x25->interrupt_in_queue);
 536         skb_queue_head_init(&x25->interrupt_out_queue);
 537 out:
 538         return sk;
 539 }
 540
 541 static int x25_create(struct net *net, struct socket *sock, int protocol,
 542                       int kern)
 543 {
 544         struct sock *sk;
 545         struct x25_sock *x25;
 546         int rc = -EAFNOSUPPORT;
 547
 548         if (!net_eq(net, &init_net))
 549                 goto out;
 550
 551         rc = -ESOCKTNOSUPPORT;
 552         if (sock->type != SOCK_SEQPACKET)
 553                 goto out;
 554
 555         rc = -EINVAL;
 556         if (protocol)
 557                 goto out;
 558
 559         rc = -ENOMEM;
 560         if ((sk = x25_alloc_socket(net, kern)) == NULL)
 561                 goto out;
 562
 563         x25 = x25_sk(sk);
 564
 565         sock_init_data(sock, sk);
 566
 567         x25_init_timers(sk);
 568
 569         sock->ops    = &x25_proto_ops;
 570         sk->sk_protocol = protocol;
 571         sk->sk_backlog_rcv = x25_backlog_rcv;
 572
 573         x25->t21   = sysctl_x25_call_request_timeout;
 574         x25->t22   = sysctl_x25_reset_request_timeout;
 575         x25->t23   = sysctl_x25_clear_request_timeout;
 576         x25->t2    = sysctl_x25_ack_holdback_timeout;
 577         x25->state = X25_STATE_0;
 578         x25->cudmatchlength = 0;
 579         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 580                                                         /* on call accept   */
 581
 582         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 583         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 584         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 585         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 586         x25->facilities.throughput  = 0;        /* by default don't negotiate
 587                                                    throughput */
 588         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 589         x25->dte_facilities.calling_len = 0;
 590         x25->dte_facilities.called_len = 0;
 591         memset(x25->dte_facilities.called_ae, '\0',
 592                         sizeof(x25->dte_facilities.called_ae));
 593         memset(x25->dte_facilities.calling_ae, '\0',
 594                         sizeof(x25->dte_facilities.calling_ae));
 595
 596         rc = 0;
 597 out:
 598         return rc;
 599 }
 600
 601 static struct sock *x25_make_new(struct sock *osk)
 602 {
 603         struct sock *sk = NULL;
 604         struct x25_sock *x25, *ox25;
 605
 606         if (osk->sk_type != SOCK_SEQPACKET)
 607                 goto out;
 608
 609         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
 610                 goto out;
 611
 612         x25 = x25_sk(sk);
 613
 614         sk->sk_type        = osk->sk_type;
 615         sk->sk_priority    = osk->sk_priority;
 616         sk->sk_protocol    = osk->sk_protocol;
 617         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 618         sk->sk_sndbuf      = osk->sk_sndbuf;
 619         sk->sk_state       = TCP_ESTABLISHED;
 620         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 621         sock_copy_flags(sk, osk);
 622
 623         ox25 = x25_sk(osk);
 624         x25->t21        = ox25->t21;
 625         x25->t22        = ox25->t22;
 626         x25->t23        = ox25->t23;
 627         x25->t2         = ox25->t2;
 628         x25->flags      = ox25->flags;
 629         x25->facilities = ox25->facilities;
 630         x25->dte_facilities = ox25->dte_facilities;
 631         x25->cudmatchlength = ox25->cudmatchlength;
 632
 633         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 634         x25_init_timers(sk);
 635 out:
 636         return sk;
 637 }
 638
 639 static int x25_release(struct socket *sock)
 640 {
 641         struct sock *sk = sock->sk;
 642         struct x25_sock *x25;
 643
 644         if (!sk)
 645                 return 0;
 646
 647         x25 = x25_sk(sk);
 648
 649         sock_hold(sk);
 650         lock_sock(sk);
 651         switch (x25->state) {
 652
 653                 case X25_STATE_0:
 654                 case X25_STATE_2:
 655                         x25_disconnect(sk, 0, 0, 0);
 656                         __x25_destroy_socket(sk);
 657                         goto out;
 658
 659                 case X25_STATE_1:
 660                 case X25_STATE_3:
 661                 case X25_STATE_4:
 662                         x25_clear_queues(sk);
 663                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 664                         x25_start_t23timer(sk);
 665                         x25->state = X25_STATE_2;
 666                         sk->sk_state    = TCP_CLOSE;
 667                         sk->sk_shutdown |= SEND_SHUTDOWN;
 668                         sk->sk_state_change(sk);
 669                         sock_set_flag(sk, SOCK_DEAD);
 670                         sock_set_flag(sk, SOCK_DESTROY);
 671                         break;
 672         }
 673
 674         sock_orphan(sk);
 675 out:
 676         release_sock(sk);
 677         sock_put(sk);
 678         return 0;
 679 }
 680
 681 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 682 {
 683         struct sock *sk = sock->sk;
 684         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 685         int len, i, rc = 0;
 686
 687         if (addr_len != sizeof(struct sockaddr_x25) ||
 688             addr->sx25_family != AF_X25 ||
 689             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
 690                 rc = -EINVAL;
 691                 goto out;
 692         }
 693
 694         /* check for the null_x25_address */
 695         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
 696
 697                 len = strlen(addr->sx25_addr.x25_addr);
 698                 for (i = 0; i < len; i++) {
 699                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 700                                 rc = -EINVAL;
 701                                 goto out;
 702                         }
 703                 }
 704         }
 705
 706         lock_sock(sk);
 707         if (sock_flag(sk, SOCK_ZAPPED)) {
 708                 x25_sk(sk)->source_addr = addr->sx25_addr;
 709                 x25_insert_socket(sk);
 710                 sock_reset_flag(sk, SOCK_ZAPPED);
 711         } else {
 712                 rc = -EINVAL;
 713         }
 714         release_sock(sk);
 715         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 716 out:
 717         return rc;
 718 }
 719
 720 static int x25_wait_for_connection_establishment(struct sock *sk)
 721 {
 722         DECLARE_WAITQUEUE(wait, current);
 723         int rc;
 724
 725         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 726         for (;;) {
 727                 __set_current_state(TASK_INTERRUPTIBLE);
 728                 rc = -ERESTARTSYS;
 729                 if (signal_pending(current))
 730                         break;
 731                 rc = sock_error(sk);
 732                 if (rc) {
 733                         sk->sk_socket->state = SS_UNCONNECTED;
 734                         break;
 735                 }
 736                 rc = 0;
 737                 if (sk->sk_state != TCP_ESTABLISHED) {
 738                         release_sock(sk);
 739                         schedule();
 740                         lock_sock(sk);
 741                 } else
 742                         break;
 743         }
 744         __set_current_state(TASK_RUNNING);
 745         remove_wait_queue(sk_sleep(sk), &wait);
 746         return rc;
 747 }
 748
 749 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 750                        int addr_len, int flags)
 751 {
 752         struct sock *sk = sock->sk;
 753         struct x25_sock *x25 = x25_sk(sk);
 754         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 755         struct x25_route *rt;
 756         int rc = 0;
 757
 758         lock_sock(sk);
 759         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 760                 sock->state = SS_CONNECTED;
 761                 goto out; /* Connect completed during a ERESTARTSYS event */
 762         }
 763
 764         rc = -ECONNREFUSED;
 765         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 766                 sock->state = SS_UNCONNECTED;
 767                 goto out;
 768         }
 769
 770         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 771         if (sk->sk_state == TCP_ESTABLISHED)
 772                 goto out;
 773
 774         rc = -EALREADY; /* Do nothing if call is already in progress */
 775         if (sk->sk_state == TCP_SYN_SENT)
 776                 goto out;
 777
 778         sk->sk_state   = TCP_CLOSE;
 779         sock->state = SS_UNCONNECTED;
 780
 781         rc = -EINVAL;
 782         if (addr_len != sizeof(struct sockaddr_x25) ||
 783             addr->sx25_family != AF_X25 ||
 784             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
 785                 goto out;
 786
 787         rc = -ENETUNREACH;
 788         rt = x25_get_route(&addr->sx25_addr);
 789         if (!rt)
 790                 goto out;
 791
 792         x25->neighbour = x25_get_neigh(rt->dev);
 793         if (!x25->neighbour)
 794                 goto out_put_route;
 795
 796         x25_limit_facilities(&x25->facilities, x25->neighbour);
 797
 798         x25->lci = x25_new_lci(x25->neighbour);
 799         if (!x25->lci)
 800                 goto out_put_neigh;
 801
 802         rc = -EINVAL;
 803         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 804                 goto out_put_neigh;
 805
 806         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 807                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 808
 809         x25->dest_addr = addr->sx25_addr;
 810
 811         /* Move to connecting socket, start sending Connect Requests */
 812         sock->state   = SS_CONNECTING;
 813         sk->sk_state  = TCP_SYN_SENT;
 814
 815         x25->state = X25_STATE_1;
 816
 817         x25_write_internal(sk, X25_CALL_REQUEST);
 818
 819         x25_start_heartbeat(sk);
 820         x25_start_t21timer(sk);
 821
 822         /* Now the loop */
 823         rc = -EINPROGRESS;
 824         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 825                 goto out;
 826
 827         rc = x25_wait_for_connection_establishment(sk);
 828         if (rc)
 829                 goto out_put_neigh;
 830
 831         sock->state = SS_CONNECTED;
 832         rc = 0;
 833 out_put_neigh:
 834         if (rc && x25->neighbour) {
 835                 read_lock_bh(&x25_list_lock);
 836                 x25_neigh_put(x25->neighbour);
 837                 x25->neighbour = NULL;
 838                 read_unlock_bh(&x25_list_lock);
 839                 x25->state = X25_STATE_0;
 840         }
 841 out_put_route:
 842         x25_route_put(rt);
 843 out:
 844         release_sock(sk);
 845         return rc;
 846 }
 847
 848 static int x25_wait_for_data(struct sock *sk, long timeout)
 849 {
 850         DECLARE_WAITQUEUE(wait, current);
 851         int rc = 0;
 852
 853         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 854         for (;;) {
 855                 __set_current_state(TASK_INTERRUPTIBLE);
 856                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 857                         break;
 858                 rc = -ERESTARTSYS;
 859                 if (signal_pending(current))
 860                         break;
 861                 rc = -EAGAIN;
 862                 if (!timeout)
 863                         break;
 864                 rc = 0;
 865                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 866                         release_sock(sk);
 867                         timeout = schedule_timeout(timeout);
 868                         lock_sock(sk);
 869                 } else
 870                         break;
 871         }
 872         __set_current_state(TASK_RUNNING);
 873         remove_wait_queue(sk_sleep(sk), &wait);
 874         return rc;
 875 }
 876
 877 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 878                       bool kern)
 879 {
 880         struct sock *sk = sock->sk;
 881         struct sock *newsk;
 882         struct sk_buff *skb;
 883         int rc = -EINVAL;
 884
 885         if (!sk)
 886                 goto out;
 887
 888         rc = -EOPNOTSUPP;
 889         if (sk->sk_type != SOCK_SEQPACKET)
 890                 goto out;
 891
 892         lock_sock(sk);
 893         rc = -EINVAL;
 894         if (sk->sk_state != TCP_LISTEN)
 895                 goto out2;
 896
 897         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 898         if (rc)
 899                 goto out2;
 900         skb = skb_dequeue(&sk->sk_receive_queue);
 901         rc = -EINVAL;
 902         if (!skb->sk)
 903                 goto out2;
 904         newsk            = skb->sk;
 905         sock_graft(newsk, newsock);
 906
 907         /* Now attach up the new socket */
 908         skb->sk = NULL;
 909         kfree_skb(skb);
 910         sk->sk_ack_backlog--;
 911         newsock->state = SS_CONNECTED;
 912         rc = 0;
 913 out2:
 914         release_sock(sk);
 915 out:
 916         return rc;
 917 }
 918
 919 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 920                        int *uaddr_len, int peer)
 921 {
 922         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 923         struct sock *sk = sock->sk;
 924         struct x25_sock *x25 = x25_sk(sk);
 925         int rc = 0;
 926
 927         if (peer) {
 928                 if (sk->sk_state != TCP_ESTABLISHED) {
 929                         rc = -ENOTCONN;
 930                         goto out;
 931                 }
 932                 sx25->sx25_addr = x25->dest_addr;
 933         } else
 934                 sx25->sx25_addr = x25->source_addr;
 935
 936         sx25->sx25_family = AF_X25;
 937         *uaddr_len = sizeof(*sx25);
 938
 939 out:
 940         return rc;
 941 }
 942
 943 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 944                         unsigned int lci)
 945 {
 946         struct sock *sk;
 947         struct sock *make;
 948         struct x25_sock *makex25;
 949         struct x25_address source_addr, dest_addr;
 950         struct x25_facilities facilities;
 951         struct x25_dte_facilities dte_facilities;
 952         int len, addr_len, rc;
 953
 954         /*
 955          *      Remove the LCI and frame type.
 956          */
 957         skb_pull(skb, X25_STD_MIN_LEN);
 958
 959         /*
 960          *      Extract the X.25 addresses and convert them to ASCII strings,
 961          *      and remove them.
 962          *
 963          *      Address block is mandatory in call request packets
 964          */
 965         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 966         if (addr_len <= 0)
 967                 goto out_clear_request;
 968         skb_pull(skb, addr_len);
 969
 970         /*
 971          *      Get the length of the facilities, skip past them for the moment
 972          *      get the call user data because this is needed to determine
 973          *      the correct listener
 974          *
 975          *      Facilities length is mandatory in call request packets
 976          */
 977         if (!pskb_may_pull(skb, 1))
 978                 goto out_clear_request;
 979         len = skb->data[0] + 1;
 980         if (!pskb_may_pull(skb, len))
 981                 goto out_clear_request;
 982         skb_pull(skb,len);
 983
 984         /*
 985          *      Ensure that the amount of call user data is valid.
 986          */
 987         if (skb->len > X25_MAX_CUD_LEN)
 988                 goto out_clear_request;
 989
 990         /*
 991          *      Get all the call user data so it can be used in
 992          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 993          */
 994         if (!pskb_may_pull(skb, skb->len))
 995                 goto out_clear_request;
 996
 997         /*
 998          *      Find a listener for the particular address/cud pair.
 999          */
1000         sk = x25_find_listener(&source_addr,skb);
1001         skb_push(skb,len);
1002
1003         if (sk != NULL && sk_acceptq_is_full(sk)) {
1004                 goto out_sock_put;
1005         }
1006
1007         /*
1008          *      We dont have any listeners for this incoming call.
1009          *      Try forwarding it.
1010          */
1011         if (sk == NULL) {
1012                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1013                 if (sysctl_x25_forward &&
1014                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1015                 {
1016                         /* Call was forwarded, dont process it any more */
1017                         kfree_skb(skb);
1018                         rc = 1;
1019                         goto out;
1020                 } else {
1021                         /* No listeners, can't forward, clear the call */
1022                         goto out_clear_request;
1023                 }
1024         }
1025
1026         /*
1027          *      Try to reach a compromise on the requested facilities.
1028          */
1029         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1030         if (len == -1)
1031                 goto out_sock_put;
1032
1033         /*
1034          * current neighbour/link might impose additional limits
1035          * on certain facilties
1036          */
1037
1038         x25_limit_facilities(&facilities, nb);
1039
1040         /*
1041          *      Try to create a new socket.
1042          */
1043         make = x25_make_new(sk);
1044         if (!make)
1045                 goto out_sock_put;
1046
1047         /*
1048          *      Remove the facilities
1049          */
1050         skb_pull(skb, len);
1051
1052         skb->sk     = make;
1053         make->sk_state = TCP_ESTABLISHED;
1054
1055         makex25 = x25_sk(make);
1056         makex25->lci           = lci;
1057         makex25->dest_addr     = dest_addr;
1058         makex25->source_addr   = source_addr;
1059         x25_neigh_hold(nb);
1060         makex25->neighbour     = nb;
1061         makex25->facilities    = facilities;
1062         makex25->dte_facilities= dte_facilities;
1063         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1064         /* ensure no reverse facil on accept */
1065         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1066         /* ensure no calling address extension on accept */
1067         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1068         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1069
1070         /* Normally all calls are accepted immediately */
1071         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1072                 x25_write_internal(make, X25_CALL_ACCEPTED);
1073                 makex25->state = X25_STATE_3;
1074         }
1075
1076         /*
1077          *      Incoming Call User Data.
1078          */
1079         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1080         makex25->calluserdata.cudlength = skb->len;
1081
1082         sk->sk_ack_backlog++;
1083
1084         x25_insert_socket(make);
1085
1086         skb_queue_head(&sk->sk_receive_queue, skb);
1087
1088         x25_start_heartbeat(make);
1089
1090         if (!sock_flag(sk, SOCK_DEAD))
1091                 sk->sk_data_ready(sk);
1092         rc = 1;
1093         sock_put(sk);
1094 out:
1095         return rc;
1096 out_sock_put:
1097         sock_put(sk);
1098 out_clear_request:
1099         rc = 0;
1100         x25_transmit_clear_request(nb, lci, 0x01);
1101         goto out;
1102 }
1103
1104 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1105 {
1106         struct sock *sk = sock->sk;
1107         struct x25_sock *x25 = x25_sk(sk);
1108         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1109         struct sockaddr_x25 sx25;
1110         struct sk_buff *skb;
1111         unsigned char *asmptr;
1112         int noblock = msg->msg_flags & MSG_DONTWAIT;
1113         size_t size;
1114         int qbit = 0, rc = -EINVAL;
1115
1116         lock_sock(sk);
1117         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1118                 goto out;
1119
1120         /* we currently don't support segmented records at the user interface */
1121         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1122                 goto out;
1123
1124         rc = -EADDRNOTAVAIL;
1125         if (sock_flag(sk, SOCK_ZAPPED))
1126                 goto out;
1127
1128         rc = -EPIPE;
1129         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1130                 send_sig(SIGPIPE, current, 0);
1131                 goto out;
1132         }
1133
1134         rc = -ENETUNREACH;
1135         if (!x25->neighbour)
1136                 goto out;
1137
1138         if (usx25) {
1139                 rc = -EINVAL;
1140                 if (msg->msg_namelen < sizeof(sx25))
1141                         goto out;
1142                 memcpy(&sx25, usx25, sizeof(sx25));
1143                 rc = -EISCONN;
1144                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1145                         goto out;
1146                 rc = -EINVAL;
1147                 if (sx25.sx25_family != AF_X25)
1148                         goto out;
1149         } else {
1150                 /*
1151                  *      FIXME 1003.1g - if the socket is like this because
1152                  *      it has become closed (not started closed) we ought
1153                  *      to SIGPIPE, EPIPE;
1154                  */
1155                 rc = -ENOTCONN;
1156                 if (sk->sk_state != TCP_ESTABLISHED)
1157                         goto out;
1158
1159                 sx25.sx25_family = AF_X25;
1160                 sx25.sx25_addr   = x25->dest_addr;
1161         }
1162
1163         /* Sanity check the packet size */
1164         if (len > 65535) {
1165                 rc = -EMSGSIZE;
1166                 goto out;
1167         }
1168
1169         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1170
1171         /* Build a packet */
1172         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1173
1174         if ((msg->msg_flags & MSG_OOB) && len > 32)
1175                 len = 32;
1176
1177         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1178
1179         release_sock(sk);
1180         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1181         lock_sock(sk);
1182         if (!skb)
1183                 goto out;
1184         X25_SKB_CB(skb)->flags = msg->msg_flags;
1185
1186         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1187
1188         /*
1189          *      Put the data on the end
1190          */
1191         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1192
1193         skb_reset_transport_header(skb);
1194         skb_put(skb, len);
1195
1196         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1197         if (rc)
1198                 goto out_kfree_skb;
1199
1200         /*
1201          *      If the Q BIT Include socket option is in force, the first
1202          *      byte of the user data is the logical value of the Q Bit.
1203          */
1204         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1205                 if (!pskb_may_pull(skb, 1))
1206                         goto out_kfree_skb;
1207
1208                 qbit = skb->data[0];
1209                 skb_pull(skb, 1);
1210         }
1211
1212         /*
1213          *      Push down the X.25 header
1214          */
1215         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1216
1217         if (msg->msg_flags & MSG_OOB) {
1218                 if (x25->neighbour->extended) {
1219                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1220                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1221                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1222                         *asmptr++ = X25_INTERRUPT;
1223                 } else {
1224                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1225                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1226                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1227                         *asmptr++ = X25_INTERRUPT;
1228                 }
1229         } else {
1230                 if (x25->neighbour->extended) {
1231                         /* Build an Extended X.25 header */
1232                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1233                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1234                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1235                         *asmptr++ = X25_DATA;
1236                         *asmptr++ = X25_DATA;
1237                 } else {
1238                         /* Build an Standard X.25 header */
1239                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1240                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1241                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1242                         *asmptr++ = X25_DATA;
1243                 }
1244
1245                 if (qbit)
1246                         skb->data[0] |= X25_Q_BIT;
1247         }
1248
1249         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1250         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1251
1252         rc = -ENOTCONN;
1253         if (sk->sk_state != TCP_ESTABLISHED)
1254                 goto out_kfree_skb;
1255
1256         if (msg->msg_flags & MSG_OOB)
1257                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1258         else {
1259                 rc = x25_output(sk, skb);
1260                 len = rc;
1261                 if (rc < 0)
1262                         kfree_skb(skb);
1263                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1264                         len++;
1265         }
1266
1267         x25_kick(sk);
1268         rc = len;
1269 out:
1270         release_sock(sk);
1271         return rc;
1272 out_kfree_skb:
1273         kfree_skb(skb);
1274         goto out;
1275 }
1276
1277
1278 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1279                        int flags)
1280 {
1281         struct sock *sk = sock->sk;
1282         struct x25_sock *x25 = x25_sk(sk);
1283         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1284         size_t copied;
1285         int qbit, header_len;
1286         struct sk_buff *skb;
1287         unsigned char *asmptr;
1288         int rc = -ENOTCONN;
1289
1290         lock_sock(sk);
1291
1292         if (x25->neighbour == NULL)
1293                 goto out;
1294
1295         header_len = x25->neighbour->extended ?
1296                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1297
1298         /*
1299          * This works for seqpacket too. The receiver has ordered the queue for
1300          * us! We do one quick check first though
1301          */
1302         if (sk->sk_state != TCP_ESTABLISHED)
1303                 goto out;
1304
1305         if (flags & MSG_OOB) {
1306                 rc = -EINVAL;
1307                 if (sock_flag(sk, SOCK_URGINLINE) ||
1308                     !skb_peek(&x25->interrupt_in_queue))
1309                         goto out;
1310
1311                 skb = skb_dequeue(&x25->interrupt_in_queue);
1312
1313                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1314                         goto out_free_dgram;
1315
1316                 skb_pull(skb, X25_STD_MIN_LEN);
1317
1318                 /*
1319                  *      No Q bit information on Interrupt data.
1320                  */
1321                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1322                         asmptr  = skb_push(skb, 1);
1323                         *asmptr = 0x00;
1324                 }
1325
1326                 msg->msg_flags |= MSG_OOB;
1327         } else {
1328                 /* Now we can treat all alike */
1329                 release_sock(sk);
1330                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1331                                         flags & MSG_DONTWAIT, &rc);
1332                 lock_sock(sk);
1333                 if (!skb)
1334                         goto out;
1335
1336                 if (!pskb_may_pull(skb, header_len))
1337                         goto out_free_dgram;
1338
1339                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1340
1341                 skb_pull(skb, header_len);
1342
1343                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1344                         asmptr  = skb_push(skb, 1);
1345                         *asmptr = qbit;
1346                 }
1347         }
1348
1349         skb_reset_transport_header(skb);
1350         copied = skb->len;
1351
1352         if (copied > size) {
1353                 copied = size;
1354                 msg->msg_flags |= MSG_TRUNC;
1355         }
1356
1357         /* Currently, each datagram always contains a complete record */
1358         msg->msg_flags |= MSG_EOR;
1359
1360         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1361         if (rc)
1362                 goto out_free_dgram;
1363
1364         if (sx25) {
1365                 sx25->sx25_family = AF_X25;
1366                 sx25->sx25_addr   = x25->dest_addr;
1367                 msg->msg_namelen = sizeof(*sx25);
1368         }
1369
1370         x25_check_rbuf(sk);
1371         rc = copied;
1372 out_free_dgram:
1373         skb_free_datagram(sk, skb);
1374 out:
1375         release_sock(sk);
1376         return rc;
1377 }
1378
1379
1380 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1381 {
1382         struct sock *sk = sock->sk;
1383         struct x25_sock *x25 = x25_sk(sk);
1384         void __user *argp = (void __user *)arg;
1385         int rc;
1386
1387         switch (cmd) {
1388         case TIOCOUTQ: {
1389                 int amount;
1390
1391                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1392                 if (amount < 0)
1393                         amount = 0;
1394                 rc = put_user(amount, (unsigned int __user *)argp);
1395                 break;
1396         }
1397
1398         case TIOCINQ: {
1399                 struct sk_buff *skb;
1400                 int amount = 0;
1401                 /*
1402                  * These two are safe on a single CPU system as
1403                  * only user tasks fiddle here
1404                  */
1405                 lock_sock(sk);
1406                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1407                         amount = skb->len;
1408                 release_sock(sk);
1409                 rc = put_user(amount, (unsigned int __user *)argp);
1410                 break;
1411         }
1412
1413         case SIOCGSTAMP:
1414                 rc = -EINVAL;
1415                 if (sk)
1416                         rc = sock_get_timestamp(sk,
1417                                                 (struct timeval __user *)argp);
1418                 break;
1419         case SIOCGSTAMPNS:
1420                 rc = -EINVAL;
1421                 if (sk)
1422                         rc = sock_get_timestampns(sk,
1423                                         (struct timespec __user *)argp);
1424                 break;
1425         case SIOCGIFADDR:
1426         case SIOCSIFADDR:
1427         case SIOCGIFDSTADDR:
1428         case SIOCSIFDSTADDR:
1429         case SIOCGIFBRDADDR:
1430         case SIOCSIFBRDADDR:
1431         case SIOCGIFNETMASK:
1432         case SIOCSIFNETMASK:
1433         case SIOCGIFMETRIC:
1434         case SIOCSIFMETRIC:
1435                 rc = -EINVAL;
1436                 break;
1437         case SIOCADDRT:
1438         case SIOCDELRT:
1439                 rc = -EPERM;
1440                 if (!capable(CAP_NET_ADMIN))
1441                         break;
1442                 rc = x25_route_ioctl(cmd, argp);
1443                 break;
1444         case SIOCX25GSUBSCRIP:
1445                 rc = x25_subscr_ioctl(cmd, argp);
1446                 break;
1447         case SIOCX25SSUBSCRIP:
1448                 rc = -EPERM;
1449                 if (!capable(CAP_NET_ADMIN))
1450                         break;
1451                 rc = x25_subscr_ioctl(cmd, argp);
1452                 break;
1453         case SIOCX25GFACILITIES: {
1454                 lock_sock(sk);
1455                 rc = copy_to_user(argp, &x25->facilities,
1456                                   sizeof(x25->facilities))
1457                         ? -EFAULT : 0;
1458                 release_sock(sk);
1459                 break;
1460         }
1461
1462         case SIOCX25SFACILITIES: {
1463                 struct x25_facilities facilities;
1464                 rc = -EFAULT;
1465                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1466                         break;
1467                 rc = -EINVAL;
1468                 lock_sock(sk);
1469                 if (sk->sk_state != TCP_LISTEN &&
1470                     sk->sk_state != TCP_CLOSE)
1471                         goto out_fac_release;
1472                 if (facilities.pacsize_in < X25_PS16 ||
1473                     facilities.pacsize_in > X25_PS4096)
1474                         goto out_fac_release;
1475                 if (facilities.pacsize_out < X25_PS16 ||
1476                     facilities.pacsize_out > X25_PS4096)
1477                         goto out_fac_release;
1478                 if (facilities.winsize_in < 1 ||
1479                     facilities.winsize_in > 127)
1480                         goto out_fac_release;
1481                 if (facilities.throughput) {
1482                         int out = facilities.throughput & 0xf0;
1483                         int in  = facilities.throughput & 0x0f;
1484                         if (!out)
1485                                 facilities.throughput |=
1486                                         X25_DEFAULT_THROUGHPUT << 4;
1487                         else if (out < 0x30 || out > 0xD0)
1488                                 goto out_fac_release;
1489                         if (!in)
1490                                 facilities.throughput |=
1491                                         X25_DEFAULT_THROUGHPUT;
1492                         else if (in < 0x03 || in > 0x0D)
1493                                 goto out_fac_release;
1494                 }
1495                 if (facilities.reverse &&
1496                     (facilities.reverse & 0x81) != 0x81)
1497                         goto out_fac_release;
1498                 x25->facilities = facilities;
1499                 rc = 0;
1500 out_fac_release:
1501                 release_sock(sk);
1502                 break;
1503         }
1504
1505         case SIOCX25GDTEFACILITIES: {
1506                 lock_sock(sk);
1507                 rc = copy_to_user(argp, &x25->dte_facilities,
1508                                   sizeof(x25->dte_facilities));
1509                 release_sock(sk);
1510                 if (rc)
1511                         rc = -EFAULT;
1512                 break;
1513         }
1514
1515         case SIOCX25SDTEFACILITIES: {
1516                 struct x25_dte_facilities dtefacs;
1517                 rc = -EFAULT;
1518                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1519                         break;
1520                 rc = -EINVAL;
1521                 lock_sock(sk);
1522                 if (sk->sk_state != TCP_LISTEN &&
1523                     sk->sk_state != TCP_CLOSE)
1524                         goto out_dtefac_release;
1525                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1526                         goto out_dtefac_release;
1527                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1528                         goto out_dtefac_release;
1529                 x25->dte_facilities = dtefacs;
1530                 rc = 0;
1531 out_dtefac_release:
1532                 release_sock(sk);
1533                 break;
1534         }
1535
1536         case SIOCX25GCALLUSERDATA: {
1537                 lock_sock(sk);
1538                 rc = copy_to_user(argp, &x25->calluserdata,
1539                                   sizeof(x25->calluserdata))
1540                         ? -EFAULT : 0;
1541                 release_sock(sk);
1542                 break;
1543         }
1544
1545         case SIOCX25SCALLUSERDATA: {
1546                 struct x25_calluserdata calluserdata;
1547
1548                 rc = -EFAULT;
1549                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1550                         break;
1551                 rc = -EINVAL;
1552                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1553                         break;
1554                 lock_sock(sk);
1555                 x25->calluserdata = calluserdata;
1556                 release_sock(sk);
1557                 rc = 0;
1558                 break;
1559         }
1560
1561         case SIOCX25GCAUSEDIAG: {
1562                 lock_sock(sk);
1563                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1564                         ? -EFAULT : 0;
1565                 release_sock(sk);
1566                 break;
1567         }
1568
1569         case SIOCX25SCAUSEDIAG: {
1570                 struct x25_causediag causediag;
1571                 rc = -EFAULT;
1572                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1573                         break;
1574                 lock_sock(sk);
1575                 x25->causediag = causediag;
1576                 release_sock(sk);
1577                 rc = 0;
1578                 break;
1579
1580         }
1581
1582         case SIOCX25SCUDMATCHLEN: {
1583                 struct x25_subaddr sub_addr;
1584                 rc = -EINVAL;
1585                 lock_sock(sk);
1586                 if(sk->sk_state != TCP_CLOSE)
1587                         goto out_cud_release;
1588                 rc = -EFAULT;
1589                 if (copy_from_user(&sub_addr, argp,
1590                                    sizeof(sub_addr)))
1591                         goto out_cud_release;
1592                 rc = -EINVAL;
1593                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1594                         goto out_cud_release;
1595                 x25->cudmatchlength = sub_addr.cudmatchlength;
1596                 rc = 0;
1597 out_cud_release:
1598                 release_sock(sk);
1599                 break;
1600         }
1601
1602         case SIOCX25CALLACCPTAPPRV: {
1603                 rc = -EINVAL;
1604                 lock_sock(sk);
1605                 if (sk->sk_state == TCP_CLOSE) {
1606                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1607                         rc = 0;
1608                 }
1609                 release_sock(sk);
1610                 break;
1611         }
1612
1613         case SIOCX25SENDCALLACCPT:  {
1614                 rc = -EINVAL;
1615                 lock_sock(sk);
1616                 if (sk->sk_state != TCP_ESTABLISHED)
1617                         goto out_sendcallaccpt_release;
1618                 /* must call accptapprv above */
1619                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1620                         goto out_sendcallaccpt_release;
1621                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1622                 x25->state = X25_STATE_3;
1623                 rc = 0;
1624 out_sendcallaccpt_release:
1625                 release_sock(sk);
1626                 break;
1627         }
1628
1629         default:
1630                 rc = -ENOIOCTLCMD;
1631                 break;
1632         }
1633
1634         return rc;
1635 }
1636
1637 static const struct net_proto_family x25_family_ops = {
1638         .family =       AF_X25,
1639         .create =       x25_create,
1640         .owner  =       THIS_MODULE,
1641 };
1642
1643 #ifdef CONFIG_COMPAT
1644 static int compat_x25_subscr_ioctl(unsigned int cmd,
1645                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1646 {
1647         struct compat_x25_subscrip_struct x25_subscr;
1648         struct x25_neigh *nb;
1649         struct net_device *dev;
1650         int rc = -EINVAL;
1651
1652         rc = -EFAULT;
1653         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1654                 goto out;
1655
1656         rc = -EINVAL;
1657         dev = x25_dev_get(x25_subscr.device);
1658         if (dev == NULL)
1659                 goto out;
1660
1661         nb = x25_get_neigh(dev);
1662         if (nb == NULL)
1663                 goto out_dev_put;
1664
1665         dev_put(dev);
1666
1667         if (cmd == SIOCX25GSUBSCRIP) {
1668                 read_lock_bh(&x25_neigh_list_lock);
1669                 x25_subscr.extended = nb->extended;
1670                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1671                 read_unlock_bh(&x25_neigh_list_lock);
1672                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1673                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1674         } else {
1675                 rc = -EINVAL;
1676                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1677                         rc = 0;
1678                         write_lock_bh(&x25_neigh_list_lock);
1679                         nb->extended = x25_subscr.extended;
1680                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1681                         write_unlock_bh(&x25_neigh_list_lock);
1682                 }
1683         }
1684         x25_neigh_put(nb);
1685 out:
1686         return rc;
1687 out_dev_put:
1688         dev_put(dev);
1689         goto out;
1690 }
1691
1692 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1693                                 unsigned long arg)
1694 {
1695         void __user *argp = compat_ptr(arg);
1696         struct sock *sk = sock->sk;
1697
1698         int rc = -ENOIOCTLCMD;
1699
1700         switch(cmd) {
1701         case TIOCOUTQ:
1702         case TIOCINQ:
1703                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1704                 break;
1705         case SIOCGSTAMP:
1706                 rc = -EINVAL;
1707                 if (sk)
1708                         rc = compat_sock_get_timestamp(sk,
1709                                         (struct timeval __user*)argp);
1710                 break;
1711         case SIOCGSTAMPNS:
1712                 rc = -EINVAL;
1713                 if (sk)
1714                         rc = compat_sock_get_timestampns(sk,
1715                                         (struct timespec __user*)argp);
1716                 break;
1717         case SIOCGIFADDR:
1718         case SIOCSIFADDR:
1719         case SIOCGIFDSTADDR:
1720         case SIOCSIFDSTADDR:
1721         case SIOCGIFBRDADDR:
1722         case SIOCSIFBRDADDR:
1723         case SIOCGIFNETMASK:
1724         case SIOCSIFNETMASK:
1725         case SIOCGIFMETRIC:
1726         case SIOCSIFMETRIC:
1727                 rc = -EINVAL;
1728                 break;
1729         case SIOCADDRT:
1730         case SIOCDELRT:
1731                 rc = -EPERM;
1732                 if (!capable(CAP_NET_ADMIN))
1733                         break;
1734                 rc = x25_route_ioctl(cmd, argp);
1735                 break;
1736         case SIOCX25GSUBSCRIP:
1737                 rc = compat_x25_subscr_ioctl(cmd, argp);
1738                 break;
1739         case SIOCX25SSUBSCRIP:
1740                 rc = -EPERM;
1741                 if (!capable(CAP_NET_ADMIN))
1742                         break;
1743                 rc = compat_x25_subscr_ioctl(cmd, argp);
1744                 break;
1745         case SIOCX25GFACILITIES:
1746         case SIOCX25SFACILITIES:
1747         case SIOCX25GDTEFACILITIES:
1748         case SIOCX25SDTEFACILITIES:
1749         case SIOCX25GCALLUSERDATA:
1750         case SIOCX25SCALLUSERDATA:
1751         case SIOCX25GCAUSEDIAG:
1752         case SIOCX25SCAUSEDIAG:
1753         case SIOCX25SCUDMATCHLEN:
1754         case SIOCX25CALLACCPTAPPRV:
1755         case SIOCX25SENDCALLACCPT:
1756                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1757                 break;
1758         default:
1759                 rc = -ENOIOCTLCMD;
1760                 break;
1761         }
1762         return rc;
1763 }
1764 #endif
1765
1766 static const struct proto_ops x25_proto_ops = {
1767         .family =       AF_X25,
1768         .owner =        THIS_MODULE,
1769         .release =      x25_release,
1770         .bind =         x25_bind,
1771         .connect =      x25_connect,
1772         .socketpair =   sock_no_socketpair,
1773         .accept =       x25_accept,
1774         .getname =      x25_getname,
1775         .poll =         datagram_poll,
1776         .ioctl =        x25_ioctl,
1777 #ifdef CONFIG_COMPAT
1778         .compat_ioctl = compat_x25_ioctl,
1779 #endif
1780         .listen =       x25_listen,
1781         .shutdown =     sock_no_shutdown,
1782         .setsockopt =   x25_setsockopt,
1783         .getsockopt =   x25_getsockopt,
1784         .sendmsg =      x25_sendmsg,
1785         .recvmsg =      x25_recvmsg,
1786         .mmap =         sock_no_mmap,
1787         .sendpage =     sock_no_sendpage,
1788 };
1789
1790 static struct packet_type x25_packet_type __read_mostly = {
1791         .type = cpu_to_be16(ETH_P_X25),
1792         .func = x25_lapb_receive_frame,
1793 };
1794
1795 static struct notifier_block x25_dev_notifier = {
1796         .notifier_call = x25_device_event,
1797 };
1798
1799 void x25_kill_by_neigh(struct x25_neigh *nb)
1800 {
1801         struct sock *s;
1802
1803         write_lock_bh(&x25_list_lock);
1804
1805         sk_for_each(s, &x25_list) {
1806                 if (x25_sk(s)->neighbour == nb) {
1807                         write_unlock_bh(&x25_list_lock);
1808                         lock_sock(s);
1809                         x25_disconnect(s, ENETUNREACH, 0, 0);
1810                         release_sock(s);
1811                         write_lock_bh(&x25_list_lock);
1812                 }
1813         }
1814         write_unlock_bh(&x25_list_lock);
1815
1816         /* Remove any related forwards */
1817         x25_clear_forward_by_dev(nb->dev);
1818 }
1819
1820 static int __init x25_init(void)
1821 {
1822         int rc;
1823
1824         rc = proto_register(&x25_proto, 0);
1825         if (rc)
1826                 goto out;
1827
1828         rc = sock_register(&x25_family_ops);
1829         if (rc)
1830                 goto out_proto;
1831
1832         dev_add_pack(&x25_packet_type);
1833
1834         rc = register_netdevice_notifier(&x25_dev_notifier);
1835         if (rc)
1836                 goto out_sock;
1837
1838         rc = x25_register_sysctl();
1839         if (rc)
1840                 goto out_dev;
1841
1842         rc = x25_proc_init();
1843         if (rc)
1844                 goto out_sysctl;
1845
1846         pr_info("Linux Version 0.2\n");
1847
1848 out:
1849         return rc;
1850 out_sysctl:
1851         x25_unregister_sysctl();
1852 out_dev:
1853         unregister_netdevice_notifier(&x25_dev_notifier);
1854 out_sock:
1855         dev_remove_pack(&x25_packet_type);
1856         sock_unregister(AF_X25);
1857 out_proto:
1858         proto_unregister(&x25_proto);
1859         goto out;
1860 }
1861 module_init(x25_init);
1862
1863 static void __exit x25_exit(void)
1864 {
1865         x25_proc_exit();
1866         x25_link_free();
1867         x25_route_free();
1868
1869         x25_unregister_sysctl();
1870
1871         unregister_netdevice_notifier(&x25_dev_notifier);
1872
1873         dev_remove_pack(&x25_packet_type);
1874
1875         sock_unregister(AF_X25);
1876         proto_unregister(&x25_proto);
1877 }
1878 module_exit(x25_exit);
1879
1880 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1881 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1882 MODULE_LICENSE("GPL");
1883 MODULE_ALIAS_NETPROTO(PF_X25);