net/x25/af_x25.c

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/capability.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/smp_lock.h>
  44 #include <linux/timer.h>
  45 #include <linux/string.h>
  46 #include <linux/net.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/skbuff.h>
  50 #include <net/sock.h>
  51 #include <net/tcp_states.h>
  52 #include <asm/uaccess.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  55 #include <linux/notifier.h>
  56 #include <linux/init.h>
  57 #include <linux/compat.h>
  58
  59 #include <net/x25.h>
  60 #include <net/compat.h>
  61
  62 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  63 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  64 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  65 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  66 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  67 int sysctl_x25_forward                 = 0;
  68
  69 HLIST_HEAD(x25_list);
  70 DEFINE_RWLOCK(x25_list_lock);
  71
  72 static const struct proto_ops x25_proto_ops;
  73
  74 static struct x25_address null_x25_address = {"               "};
  75
  76 #ifdef CONFIG_COMPAT
  77 struct compat_x25_subscrip_struct {
  78         char device[200-sizeof(compat_ulong_t)];
  79         compat_ulong_t global_facil_mask;
  80         compat_uint_t extended;
  81 };
  82 #endif
  83
  84
  85 int x25_parse_address_block(struct sk_buff *skb,
  86                 struct x25_address *called_addr,
  87                 struct x25_address *calling_addr)
  88 {
  89         unsigned char len;
  90         int needed;
  91         int rc;
  92
  93         if (skb->len < 1) {
  94                 /* packet has no address block */
  95                 rc = 0;
  96                 goto empty;
  97         }
  98
  99         len = *skb->data;
 100         needed = 1 + (len >> 4) + (len & 0x0f);
 101
 102         if (skb->len < needed) {
 103                 /* packet is too short to hold the addresses it claims
 104                    to hold */
 105                 rc = -1;
 106                 goto empty;
 107         }
 108
 109         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 110
 111 empty:
 112         *called_addr->x25_addr = 0;
 113         *calling_addr->x25_addr = 0;
 114
 115         return rc;
 116 }
 117
 118
 119 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 120                   struct x25_address *calling_addr)
 121 {
 122         unsigned int called_len, calling_len;
 123         char *called, *calling;
 124         unsigned int i;
 125
 126         called_len  = (*p >> 0) & 0x0F;
 127         calling_len = (*p >> 4) & 0x0F;
 128
 129         called  = called_addr->x25_addr;
 130         calling = calling_addr->x25_addr;
 131         p++;
 132
 133         for (i = 0; i < (called_len + calling_len); i++) {
 134                 if (i < called_len) {
 135                         if (i % 2 != 0) {
 136                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 137                                 p++;
 138                         } else {
 139                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 140                         }
 141                 } else {
 142                         if (i % 2 != 0) {
 143                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 144                                 p++;
 145                         } else {
 146                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 147                         }
 148                 }
 149         }
 150
 151         *called = *calling = '\0';
 152
 153         return 1 + (called_len + calling_len + 1) / 2;
 154 }
 155
 156 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 157                   struct x25_address *calling_addr)
 158 {
 159         unsigned int called_len, calling_len;
 160         char *called, *calling;
 161         int i;
 162
 163         called  = called_addr->x25_addr;
 164         calling = calling_addr->x25_addr;
 165
 166         called_len  = strlen(called);
 167         calling_len = strlen(calling);
 168
 169         *p++ = (calling_len << 4) | (called_len << 0);
 170
 171         for (i = 0; i < (called_len + calling_len); i++) {
 172                 if (i < called_len) {
 173                         if (i % 2 != 0) {
 174                                 *p |= (*called++ - '0') << 0;
 175                                 p++;
 176                         } else {
 177                                 *p = 0x00;
 178                                 *p |= (*called++ - '0') << 4;
 179                         }
 180                 } else {
 181                         if (i % 2 != 0) {
 182                                 *p |= (*calling++ - '0') << 0;
 183                                 p++;
 184                         } else {
 185                                 *p = 0x00;
 186                                 *p |= (*calling++ - '0') << 4;
 187                         }
 188                 }
 189         }
 190
 191         return 1 + (called_len + calling_len + 1) / 2;
 192 }
 193
 194 /*
 195  *      Socket removal during an interrupt is now safe.
 196  */
 197 static void x25_remove_socket(struct sock *sk)
 198 {
 199         write_lock_bh(&x25_list_lock);
 200         sk_del_node_init(sk);
 201         write_unlock_bh(&x25_list_lock);
 202 }
 203
 204 /*
 205  *      Kill all bound sockets on a dropped device.
 206  */
 207 static void x25_kill_by_device(struct net_device *dev)
 208 {
 209         struct sock *s;
 210         struct hlist_node *node;
 211
 212         write_lock_bh(&x25_list_lock);
 213
 214         sk_for_each(s, node, &x25_list)
 215                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 216                         x25_disconnect(s, ENETUNREACH, 0, 0);
 217
 218         write_unlock_bh(&x25_list_lock);
 219 }
 220
 221 /*
 222  *      Handle device status changes.
 223  */
 224 static int x25_device_event(struct notifier_block *this, unsigned long event,
 225                             void *ptr)
 226 {
 227         struct net_device *dev = ptr;
 228         struct x25_neigh *nb;
 229
 230         if (!net_eq(dev_net(dev), &init_net))
 231                 return NOTIFY_DONE;
 232
 233         if (dev->type == ARPHRD_X25
 234 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 235          || dev->type == ARPHRD_ETHER
 236 #endif
 237          ) {
 238                 switch (event) {
 239                         case NETDEV_UP:
 240                                 x25_link_device_up(dev);
 241                                 break;
 242                         case NETDEV_GOING_DOWN:
 243                                 nb = x25_get_neigh(dev);
 244                                 if (nb) {
 245                                         x25_terminate_link(nb);
 246                                         x25_neigh_put(nb);
 247                                 }
 248                                 break;
 249                         case NETDEV_DOWN:
 250                                 x25_kill_by_device(dev);
 251                                 x25_route_device_down(dev);
 252                                 x25_link_device_down(dev);
 253                                 break;
 254                 }
 255         }
 256
 257         return NOTIFY_DONE;
 258 }
 259
 260 /*
 261  *      Add a socket to the bound sockets list.
 262  */
 263 static void x25_insert_socket(struct sock *sk)
 264 {
 265         write_lock_bh(&x25_list_lock);
 266         sk_add_node(sk, &x25_list);
 267         write_unlock_bh(&x25_list_lock);
 268 }
 269
 270 /*
 271  *      Find a socket that wants to accept the Call Request we just
 272  *      received. Check the full list for an address/cud match.
 273  *      If no cuds match return the next_best thing, an address match.
 274  *      Note: if a listening socket has cud set it must only get calls
 275  *      with matching cud.
 276  */
 277 static struct sock *x25_find_listener(struct x25_address *addr,
 278                                         struct sk_buff *skb)
 279 {
 280         struct sock *s;
 281         struct sock *next_best;
 282         struct hlist_node *node;
 283
 284         read_lock_bh(&x25_list_lock);
 285         next_best = NULL;
 286
 287         sk_for_each(s, node, &x25_list)
 288                 if ((!strcmp(addr->x25_addr,
 289                         x25_sk(s)->source_addr.x25_addr) ||
 290                                 !strcmp(addr->x25_addr,
 291                                         null_x25_address.x25_addr)) &&
 292                                         s->sk_state == TCP_LISTEN) {
 293                         /*
 294                          * Found a listening socket, now check the incoming
 295                          * call user data vs this sockets call user data
 296                          */
 297                         if (x25_sk(s)->cudmatchlength > 0 &&
 298                                 skb->len >= x25_sk(s)->cudmatchlength) {
 299                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 300                                         skb->data,
 301                                         x25_sk(s)->cudmatchlength)) == 0) {
 302                                         sock_hold(s);
 303                                         goto found;
 304                                  }
 305                         } else
 306                                 next_best = s;
 307                 }
 308         if (next_best) {
 309                 s = next_best;
 310                 sock_hold(s);
 311                 goto found;
 312         }
 313         s = NULL;
 314 found:
 315         read_unlock_bh(&x25_list_lock);
 316         return s;
 317 }
 318
 319 /*
 320  *      Find a connected X.25 socket given my LCI and neighbour.
 321  */
 322 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 323 {
 324         struct sock *s;
 325         struct hlist_node *node;
 326
 327         sk_for_each(s, node, &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         read_lock_bh(&x25_list_lock);
 356
 357         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 358                 sock_put(sk);
 359                 if (++lci == 4096) {
 360                         lci = 0;
 361                         break;
 362                 }
 363         }
 364
 365         read_unlock_bh(&x25_list_lock);
 366         return lci;
 367 }
 368
 369 /*
 370  *      Deferred destroy.
 371  */
 372 static void __x25_destroy_socket(struct sock *);
 373
 374 /*
 375  *      handler for deferred kills.
 376  */
 377 static void x25_destroy_timer(unsigned long data)
 378 {
 379         x25_destroy_socket_from_timer((struct sock *)data);
 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                         sock_set_flag(skb->sk, SOCK_DEAD);
 405                         x25_start_heartbeat(skb->sk);
 406                         x25_sk(skb->sk)->state = X25_STATE_0;
 407                 }
 408
 409                 kfree_skb(skb);
 410         }
 411
 412         if (sk_has_allocations(sk)) {
 413                 /* Defer: outstanding buffers */
 414                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 415                 sk->sk_timer.function = x25_destroy_timer;
 416                 sk->sk_timer.data = (unsigned long)sk;
 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 static void x25_destroy_socket(struct sock *sk)
 434 {
 435         sock_hold(sk);
 436         lock_sock(sk);
 437         __x25_destroy_socket(sk);
 438         release_sock(sk);
 439         sock_put(sk);
 440 }
 441
 442 /*
 443  *      Handling for system calls applied via the various interfaces to a
 444  *      X.25 socket object.
 445  */
 446
 447 static int x25_setsockopt(struct socket *sock, int level, int optname,
 448                           char __user *optval, unsigned int optlen)
 449 {
 450         int opt;
 451         struct sock *sk = sock->sk;
 452         int rc = -ENOPROTOOPT;
 453
 454         lock_kernel();
 455         if (level != SOL_X25 || optname != X25_QBITINCL)
 456                 goto out;
 457
 458         rc = -EINVAL;
 459         if (optlen < sizeof(int))
 460                 goto out;
 461
 462         rc = -EFAULT;
 463         if (get_user(opt, (int __user *)optval))
 464                 goto out;
 465
 466         x25_sk(sk)->qbitincl = !!opt;
 467         rc = 0;
 468 out:
 469         unlock_kernel();
 470         return rc;
 471 }
 472
 473 static int x25_getsockopt(struct socket *sock, int level, int optname,
 474                           char __user *optval, int __user *optlen)
 475 {
 476         struct sock *sk = sock->sk;
 477         int val, len, rc = -ENOPROTOOPT;
 478
 479         lock_kernel();
 480         if (level != SOL_X25 || optname != X25_QBITINCL)
 481                 goto out;
 482
 483         rc = -EFAULT;
 484         if (get_user(len, optlen))
 485                 goto out;
 486
 487         len = min_t(unsigned int, len, sizeof(int));
 488
 489         rc = -EINVAL;
 490         if (len < 0)
 491                 goto out;
 492
 493         rc = -EFAULT;
 494         if (put_user(len, optlen))
 495                 goto out;
 496
 497         val = x25_sk(sk)->qbitincl;
 498         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 499 out:
 500         unlock_kernel();
 501         return rc;
 502 }
 503
 504 static int x25_listen(struct socket *sock, int backlog)
 505 {
 506         struct sock *sk = sock->sk;
 507         int rc = -EOPNOTSUPP;
 508
 509         lock_kernel();
 510         if (sk->sk_state != TCP_LISTEN) {
 511                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 512                 sk->sk_max_ack_backlog = backlog;
 513                 sk->sk_state           = TCP_LISTEN;
 514                 rc = 0;
 515         }
 516         unlock_kernel();
 517
 518         return rc;
 519 }
 520
 521 static struct proto x25_proto = {
 522         .name     = "X25",
 523         .owner    = THIS_MODULE,
 524         .obj_size = sizeof(struct x25_sock),
 525 };
 526
 527 static struct sock *x25_alloc_socket(struct net *net)
 528 {
 529         struct x25_sock *x25;
 530         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 531
 532         if (!sk)
 533                 goto out;
 534
 535         sock_init_data(NULL, sk);
 536
 537         x25 = x25_sk(sk);
 538         skb_queue_head_init(&x25->ack_queue);
 539         skb_queue_head_init(&x25->fragment_queue);
 540         skb_queue_head_init(&x25->interrupt_in_queue);
 541         skb_queue_head_init(&x25->interrupt_out_queue);
 542 out:
 543         return sk;
 544 }
 545
 546 static int x25_create(struct net *net, struct socket *sock, int protocol,
 547                       int kern)
 548 {
 549         struct sock *sk;
 550         struct x25_sock *x25;
 551         int rc = -ESOCKTNOSUPPORT;
 552
 553         if (!net_eq(net, &init_net))
 554                 return -EAFNOSUPPORT;
 555
 556         if (sock->type != SOCK_SEQPACKET || protocol)
 557                 goto out;
 558
 559         rc = -ENOMEM;
 560         if ((sk = x25_alloc_socket(net)) == 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         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* 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  = X25_DEFAULT_THROUGHPUT;
 587         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 588         x25->dte_facilities.calling_len = 0;
 589         x25->dte_facilities.called_len = 0;
 590         memset(x25->dte_facilities.called_ae, '\0',
 591                         sizeof(x25->dte_facilities.called_ae));
 592         memset(x25->dte_facilities.calling_ae, '\0',
 593                         sizeof(x25->dte_facilities.calling_ae));
 594
 595         rc = 0;
 596 out:
 597         return rc;
 598 }
 599
 600 static struct sock *x25_make_new(struct sock *osk)
 601 {
 602         struct sock *sk = NULL;
 603         struct x25_sock *x25, *ox25;
 604
 605         if (osk->sk_type != SOCK_SEQPACKET)
 606                 goto out;
 607
 608         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 609                 goto out;
 610
 611         x25 = x25_sk(sk);
 612
 613         sk->sk_type        = osk->sk_type;
 614         sk->sk_priority    = osk->sk_priority;
 615         sk->sk_protocol    = osk->sk_protocol;
 616         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 617         sk->sk_sndbuf      = osk->sk_sndbuf;
 618         sk->sk_state       = TCP_ESTABLISHED;
 619         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 620         sock_copy_flags(sk, osk);
 621
 622         ox25 = x25_sk(osk);
 623         x25->t21        = ox25->t21;
 624         x25->t22        = ox25->t22;
 625         x25->t23        = ox25->t23;
 626         x25->t2         = ox25->t2;
 627         x25->facilities = ox25->facilities;
 628         x25->qbitincl   = ox25->qbitincl;
 629         x25->dte_facilities = ox25->dte_facilities;
 630         x25->cudmatchlength = ox25->cudmatchlength;
 631         x25->accptapprv = ox25->accptapprv;
 632
 633         x25_init_timers(sk);
 634 out:
 635         return sk;
 636 }
 637
 638 static int x25_release(struct socket *sock)
 639 {
 640         struct sock *sk = sock->sk;
 641         struct x25_sock *x25;
 642
 643         lock_kernel();
 644         if (!sk)
 645                 goto out;
 646
 647         x25 = x25_sk(sk);
 648
 649         switch (x25->state) {
 650
 651                 case X25_STATE_0:
 652                 case X25_STATE_2:
 653                         x25_disconnect(sk, 0, 0, 0);
 654                         x25_destroy_socket(sk);
 655                         goto out;
 656
 657                 case X25_STATE_1:
 658                 case X25_STATE_3:
 659                 case X25_STATE_4:
 660                         x25_clear_queues(sk);
 661                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 662                         x25_start_t23timer(sk);
 663                         x25->state = X25_STATE_2;
 664                         sk->sk_state    = TCP_CLOSE;
 665                         sk->sk_shutdown |= SEND_SHUTDOWN;
 666                         sk->sk_state_change(sk);
 667                         sock_set_flag(sk, SOCK_DEAD);
 668                         sock_set_flag(sk, SOCK_DESTROY);
 669                         break;
 670         }
 671
 672         sock_orphan(sk);
 673 out:
 674         unlock_kernel();
 675         return 0;
 676 }
 677
 678 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 679 {
 680         struct sock *sk = sock->sk;
 681         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 682         int rc = 0;
 683
 684         lock_kernel();
 685         if (!sock_flag(sk, SOCK_ZAPPED) ||
 686             addr_len != sizeof(struct sockaddr_x25) ||
 687             addr->sx25_family != AF_X25) {
 688                 rc = -EINVAL;
 689                 goto out;
 690         }
 691
 692         x25_sk(sk)->source_addr = addr->sx25_addr;
 693         x25_insert_socket(sk);
 694         sock_reset_flag(sk, SOCK_ZAPPED);
 695         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 696 out:
 697         unlock_kernel();
 698         return rc;
 699 }
 700
 701 static int x25_wait_for_connection_establishment(struct sock *sk)
 702 {
 703         DECLARE_WAITQUEUE(wait, current);
 704         int rc;
 705
 706         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 707         for (;;) {
 708                 __set_current_state(TASK_INTERRUPTIBLE);
 709                 rc = -ERESTARTSYS;
 710                 if (signal_pending(current))
 711                         break;
 712                 rc = sock_error(sk);
 713                 if (rc) {
 714                         sk->sk_socket->state = SS_UNCONNECTED;
 715                         break;
 716                 }
 717                 rc = 0;
 718                 if (sk->sk_state != TCP_ESTABLISHED) {
 719                         release_sock(sk);
 720                         schedule();
 721                         lock_sock(sk);
 722                 } else
 723                         break;
 724         }
 725         __set_current_state(TASK_RUNNING);
 726         remove_wait_queue(sk->sk_sleep, &wait);
 727         return rc;
 728 }
 729
 730 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 731                        int addr_len, int flags)
 732 {
 733         struct sock *sk = sock->sk;
 734         struct x25_sock *x25 = x25_sk(sk);
 735         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 736         struct x25_route *rt;
 737         int rc = 0;
 738
 739         lock_kernel();
 740         lock_sock(sk);
 741         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 742                 sock->state = SS_CONNECTED;
 743                 goto out; /* Connect completed during a ERESTARTSYS event */
 744         }
 745
 746         rc = -ECONNREFUSED;
 747         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 748                 sock->state = SS_UNCONNECTED;
 749                 goto out;
 750         }
 751
 752         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 753         if (sk->sk_state == TCP_ESTABLISHED)
 754                 goto out;
 755
 756         sk->sk_state   = TCP_CLOSE;
 757         sock->state = SS_UNCONNECTED;
 758
 759         rc = -EINVAL;
 760         if (addr_len != sizeof(struct sockaddr_x25) ||
 761             addr->sx25_family != AF_X25)
 762                 goto out;
 763
 764         rc = -ENETUNREACH;
 765         rt = x25_get_route(&addr->sx25_addr);
 766         if (!rt)
 767                 goto out;
 768
 769         x25->neighbour = x25_get_neigh(rt->dev);
 770         if (!x25->neighbour)
 771                 goto out_put_route;
 772
 773         x25_limit_facilities(&x25->facilities, x25->neighbour);
 774
 775         x25->lci = x25_new_lci(x25->neighbour);
 776         if (!x25->lci)
 777                 goto out_put_neigh;
 778
 779         rc = -EINVAL;
 780         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 781                 goto out_put_neigh;
 782
 783         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 784                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 785
 786         x25->dest_addr = addr->sx25_addr;
 787
 788         /* Move to connecting socket, start sending Connect Requests */
 789         sock->state   = SS_CONNECTING;
 790         sk->sk_state  = TCP_SYN_SENT;
 791
 792         x25->state = X25_STATE_1;
 793
 794         x25_write_internal(sk, X25_CALL_REQUEST);
 795
 796         x25_start_heartbeat(sk);
 797         x25_start_t21timer(sk);
 798
 799         /* Now the loop */
 800         rc = -EINPROGRESS;
 801         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 802                 goto out_put_neigh;
 803
 804         rc = x25_wait_for_connection_establishment(sk);
 805         if (rc)
 806                 goto out_put_neigh;
 807
 808         sock->state = SS_CONNECTED;
 809         rc = 0;
 810 out_put_neigh:
 811         if (rc)
 812                 x25_neigh_put(x25->neighbour);
 813 out_put_route:
 814         x25_route_put(rt);
 815 out:
 816         release_sock(sk);
 817         unlock_kernel();
 818         return rc;
 819 }
 820
 821 static int x25_wait_for_data(struct sock *sk, long timeout)
 822 {
 823         DECLARE_WAITQUEUE(wait, current);
 824         int rc = 0;
 825
 826         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 827         for (;;) {
 828                 __set_current_state(TASK_INTERRUPTIBLE);
 829                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 830                         break;
 831                 rc = -ERESTARTSYS;
 832                 if (signal_pending(current))
 833                         break;
 834                 rc = -EAGAIN;
 835                 if (!timeout)
 836                         break;
 837                 rc = 0;
 838                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 839                         release_sock(sk);
 840                         timeout = schedule_timeout(timeout);
 841                         lock_sock(sk);
 842                 } else
 843                         break;
 844         }
 845         __set_current_state(TASK_RUNNING);
 846         remove_wait_queue(sk->sk_sleep, &wait);
 847         return rc;
 848 }
 849
 850 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 851 {
 852         struct sock *sk = sock->sk;
 853         struct sock *newsk;
 854         struct sk_buff *skb;
 855         int rc = -EINVAL;
 856
 857         lock_kernel();
 858         if (!sk || sk->sk_state != TCP_LISTEN)
 859                 goto out;
 860
 861         rc = -EOPNOTSUPP;
 862         if (sk->sk_type != SOCK_SEQPACKET)
 863                 goto out;
 864
 865         lock_sock(sk);
 866         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 867         if (rc)
 868                 goto out2;
 869         skb = skb_dequeue(&sk->sk_receive_queue);
 870         rc = -EINVAL;
 871         if (!skb->sk)
 872                 goto out2;
 873         newsk            = skb->sk;
 874         sock_graft(newsk, newsock);
 875
 876         /* Now attach up the new socket */
 877         skb->sk = NULL;
 878         kfree_skb(skb);
 879         sk->sk_ack_backlog--;
 880         newsock->state = SS_CONNECTED;
 881         rc = 0;
 882 out2:
 883         release_sock(sk);
 884 out:
 885         unlock_kernel();
 886         return rc;
 887 }
 888
 889 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 890                        int *uaddr_len, int peer)
 891 {
 892         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 893         struct sock *sk = sock->sk;
 894         struct x25_sock *x25 = x25_sk(sk);
 895         int rc = 0;
 896
 897         lock_kernel();
 898         if (peer) {
 899                 if (sk->sk_state != TCP_ESTABLISHED) {
 900                         rc = -ENOTCONN;
 901                         goto out;
 902                 }
 903                 sx25->sx25_addr = x25->dest_addr;
 904         } else
 905                 sx25->sx25_addr = x25->source_addr;
 906
 907         sx25->sx25_family = AF_X25;
 908         *uaddr_len = sizeof(*sx25);
 909
 910 out:
 911         unlock_kernel();
 912         return rc;
 913 }
 914
 915 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
 916                            poll_table *wait)
 917 {
 918         int rc;
 919
 920         lock_kernel();
 921         rc = datagram_poll(file, sock, wait);
 922         unlock_kernel();
 923
 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 (skb->len < 1)
 962                 goto out_clear_request;
 963         len = skb->data[0] + 1;
 964         if (skb->len < len)
 965                 goto out_clear_request;
 966         skb_pull(skb,len);
 967
 968         /*
 969          *      Find a listener for the particular address/cud pair.
 970          */
 971         sk = x25_find_listener(&source_addr,skb);
 972         skb_push(skb,len);
 973
 974         if (sk != NULL && sk_acceptq_is_full(sk)) {
 975                 goto out_sock_put;
 976         }
 977
 978         /*
 979          *      We dont have any listeners for this incoming call.
 980          *      Try forwarding it.
 981          */
 982         if (sk == NULL) {
 983                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 984                 if (sysctl_x25_forward &&
 985                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 986                 {
 987                         /* Call was forwarded, dont process it any more */
 988                         kfree_skb(skb);
 989                         rc = 1;
 990                         goto out;
 991                 } else {
 992                         /* No listeners, can't forward, clear the call */
 993                         goto out_clear_request;
 994                 }
 995         }
 996
 997         /*
 998          *      Try to reach a compromise on the requested facilities.
 999          */
1000         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1001         if (len == -1)
1002                 goto out_sock_put;
1003
1004         /*
1005          * current neighbour/link might impose additional limits
1006          * on certain facilties
1007          */
1008
1009         x25_limit_facilities(&facilities, nb);
1010
1011         /*
1012          *      Try to create a new socket.
1013          */
1014         make = x25_make_new(sk);
1015         if (!make)
1016                 goto out_sock_put;
1017
1018         /*
1019          *      Remove the facilities
1020          */
1021         skb_pull(skb, len);
1022
1023         skb->sk     = make;
1024         make->sk_state = TCP_ESTABLISHED;
1025
1026         makex25 = x25_sk(make);
1027         makex25->lci           = lci;
1028         makex25->dest_addr     = dest_addr;
1029         makex25->source_addr   = source_addr;
1030         makex25->neighbour     = nb;
1031         makex25->facilities    = facilities;
1032         makex25->dte_facilities= dte_facilities;
1033         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1034         /* ensure no reverse facil on accept */
1035         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1036         /* ensure no calling address extension on accept */
1037         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1038         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1039
1040         /* Normally all calls are accepted immediatly */
1041         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
1042                 x25_write_internal(make, X25_CALL_ACCEPTED);
1043                 makex25->state = X25_STATE_3;
1044         }
1045
1046         /*
1047          *      Incoming Call User Data.
1048          */
1049         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1050         makex25->calluserdata.cudlength = skb->len;
1051
1052         sk->sk_ack_backlog++;
1053
1054         x25_insert_socket(make);
1055
1056         skb_queue_head(&sk->sk_receive_queue, skb);
1057
1058         x25_start_heartbeat(make);
1059
1060         if (!sock_flag(sk, SOCK_DEAD))
1061                 sk->sk_data_ready(sk, skb->len);
1062         rc = 1;
1063         sock_put(sk);
1064 out:
1065         return rc;
1066 out_sock_put:
1067         sock_put(sk);
1068 out_clear_request:
1069         rc = 0;
1070         x25_transmit_clear_request(nb, lci, 0x01);
1071         goto out;
1072 }
1073
1074 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1075                        struct msghdr *msg, size_t len)
1076 {
1077         struct sock *sk = sock->sk;
1078         struct x25_sock *x25 = x25_sk(sk);
1079         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1080         struct sockaddr_x25 sx25;
1081         struct sk_buff *skb;
1082         unsigned char *asmptr;
1083         int noblock = msg->msg_flags & MSG_DONTWAIT;
1084         size_t size;
1085         int qbit = 0, rc = -EINVAL;
1086
1087         lock_kernel();
1088         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1089                 goto out;
1090
1091         /* we currently don't support segmented records at the user interface */
1092         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1093                 goto out;
1094
1095         rc = -EADDRNOTAVAIL;
1096         if (sock_flag(sk, SOCK_ZAPPED))
1097                 goto out;
1098
1099         rc = -EPIPE;
1100         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1101                 send_sig(SIGPIPE, current, 0);
1102                 goto out;
1103         }
1104
1105         rc = -ENETUNREACH;
1106         if (!x25->neighbour)
1107                 goto out;
1108
1109         if (usx25) {
1110                 rc = -EINVAL;
1111                 if (msg->msg_namelen < sizeof(sx25))
1112                         goto out;
1113                 memcpy(&sx25, usx25, sizeof(sx25));
1114                 rc = -EISCONN;
1115                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1116                         goto out;
1117                 rc = -EINVAL;
1118                 if (sx25.sx25_family != AF_X25)
1119                         goto out;
1120         } else {
1121                 /*
1122                  *      FIXME 1003.1g - if the socket is like this because
1123                  *      it has become closed (not started closed) we ought
1124                  *      to SIGPIPE, EPIPE;
1125                  */
1126                 rc = -ENOTCONN;
1127                 if (sk->sk_state != TCP_ESTABLISHED)
1128                         goto out;
1129
1130                 sx25.sx25_family = AF_X25;
1131                 sx25.sx25_addr   = x25->dest_addr;
1132         }
1133
1134         /* Sanity check the packet size */
1135         if (len > 65535) {
1136                 rc = -EMSGSIZE;
1137                 goto out;
1138         }
1139
1140         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1141
1142         /* Build a packet */
1143         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1144
1145         if ((msg->msg_flags & MSG_OOB) && len > 32)
1146                 len = 32;
1147
1148         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1149
1150         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1151         if (!skb)
1152                 goto out;
1153         X25_SKB_CB(skb)->flags = msg->msg_flags;
1154
1155         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1156
1157         /*
1158          *      Put the data on the end
1159          */
1160         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1161
1162         skb_reset_transport_header(skb);
1163         skb_put(skb, len);
1164
1165         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1166         if (rc)
1167                 goto out_kfree_skb;
1168
1169         /*
1170          *      If the Q BIT Include socket option is in force, the first
1171          *      byte of the user data is the logical value of the Q Bit.
1172          */
1173         if (x25->qbitincl) {
1174                 qbit = skb->data[0];
1175                 skb_pull(skb, 1);
1176         }
1177
1178         /*
1179          *      Push down the X.25 header
1180          */
1181         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1182
1183         if (msg->msg_flags & MSG_OOB) {
1184                 if (x25->neighbour->extended) {
1185                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1186                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1187                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1188                         *asmptr++ = X25_INTERRUPT;
1189                 } else {
1190                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1191                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1192                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1193                         *asmptr++ = X25_INTERRUPT;
1194                 }
1195         } else {
1196                 if (x25->neighbour->extended) {
1197                         /* Build an Extended X.25 header */
1198                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1199                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1200                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1201                         *asmptr++ = X25_DATA;
1202                         *asmptr++ = X25_DATA;
1203                 } else {
1204                         /* Build an Standard X.25 header */
1205                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1206                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1207                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1208                         *asmptr++ = X25_DATA;
1209                 }
1210
1211                 if (qbit)
1212                         skb->data[0] |= X25_Q_BIT;
1213         }
1214
1215         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1216         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1217
1218         rc = -ENOTCONN;
1219         if (sk->sk_state != TCP_ESTABLISHED)
1220                 goto out_kfree_skb;
1221
1222         if (msg->msg_flags & MSG_OOB)
1223                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1224         else {
1225                 rc = x25_output(sk, skb);
1226                 len = rc;
1227                 if (rc < 0)
1228                         kfree_skb(skb);
1229                 else if (x25->qbitincl)
1230                         len++;
1231         }
1232
1233         /*
1234          * lock_sock() is currently only used to serialize this x25_kick()
1235          * against input-driven x25_kick() calls. It currently only blocks
1236          * incoming packets for this socket and does not protect against
1237          * any other socket state changes and is not called from anywhere
1238          * else. As x25_kick() cannot block and as long as all socket
1239          * operations are BKL-wrapped, we don't need take to care about
1240          * purging the backlog queue in x25_release().
1241          *
1242          * Using lock_sock() to protect all socket operations entirely
1243          * (and making the whole x25 stack SMP aware) unfortunately would
1244          * require major changes to {send,recv}msg and skb allocation methods.
1245          * -> 2.5 ;)
1246          */
1247         lock_sock(sk);
1248         x25_kick(sk);
1249         release_sock(sk);
1250         rc = len;
1251 out:
1252         unlock_kernel();
1253         return rc;
1254 out_kfree_skb:
1255         kfree_skb(skb);
1256         goto out;
1257 }
1258
1259
1260 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1261                        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         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1267         size_t copied;
1268         int qbit;
1269         struct sk_buff *skb;
1270         unsigned char *asmptr;
1271         int rc = -ENOTCONN;
1272
1273         lock_kernel();
1274         /*
1275          * This works for seqpacket too. The receiver has ordered the queue for
1276          * us! We do one quick check first though
1277          */
1278         if (sk->sk_state != TCP_ESTABLISHED)
1279                 goto out;
1280
1281         if (flags & MSG_OOB) {
1282                 rc = -EINVAL;
1283                 if (sock_flag(sk, SOCK_URGINLINE) ||
1284                     !skb_peek(&x25->interrupt_in_queue))
1285                         goto out;
1286
1287                 skb = skb_dequeue(&x25->interrupt_in_queue);
1288
1289                 skb_pull(skb, X25_STD_MIN_LEN);
1290
1291                 /*
1292                  *      No Q bit information on Interrupt data.
1293                  */
1294                 if (x25->qbitincl) {
1295                         asmptr  = skb_push(skb, 1);
1296                         *asmptr = 0x00;
1297                 }
1298
1299                 msg->msg_flags |= MSG_OOB;
1300         } else {
1301                 /* Now we can treat all alike */
1302                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1303                                         flags & MSG_DONTWAIT, &rc);
1304                 if (!skb)
1305                         goto out;
1306
1307                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1308
1309                 skb_pull(skb, x25->neighbour->extended ?
1310                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1311
1312                 if (x25->qbitincl) {
1313                         asmptr  = skb_push(skb, 1);
1314                         *asmptr = qbit;
1315                 }
1316         }
1317
1318         skb_reset_transport_header(skb);
1319         copied = skb->len;
1320
1321         if (copied > size) {
1322                 copied = size;
1323                 msg->msg_flags |= MSG_TRUNC;
1324         }
1325
1326         /* Currently, each datagram always contains a complete record */
1327         msg->msg_flags |= MSG_EOR;
1328
1329         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1330         if (rc)
1331                 goto out_free_dgram;
1332
1333         if (sx25) {
1334                 sx25->sx25_family = AF_X25;
1335                 sx25->sx25_addr   = x25->dest_addr;
1336         }
1337
1338         msg->msg_namelen = sizeof(struct sockaddr_x25);
1339
1340         lock_sock(sk);
1341         x25_check_rbuf(sk);
1342         release_sock(sk);
1343         rc = copied;
1344 out_free_dgram:
1345         skb_free_datagram(sk, skb);
1346 out:
1347         unlock_kernel();
1348         return rc;
1349 }
1350
1351
1352 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1353 {
1354         struct sock *sk = sock->sk;
1355         struct x25_sock *x25 = x25_sk(sk);
1356         void __user *argp = (void __user *)arg;
1357         int rc;
1358
1359         lock_kernel();
1360         switch (cmd) {
1361                 case TIOCOUTQ: {
1362                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1363
1364                         if (amount < 0)
1365                                 amount = 0;
1366                         rc = put_user(amount, (unsigned int __user *)argp);
1367                         break;
1368                 }
1369
1370                 case TIOCINQ: {
1371                         struct sk_buff *skb;
1372                         int amount = 0;
1373                         /*
1374                          * These two are safe on a single CPU system as
1375                          * only user tasks fiddle here
1376                          */
1377                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1378                                 amount = skb->len;
1379                         rc = put_user(amount, (unsigned int __user *)argp);
1380                         break;
1381                 }
1382
1383                 case SIOCGSTAMP:
1384                         rc = -EINVAL;
1385                         if (sk)
1386                                 rc = sock_get_timestamp(sk,
1387                                                 (struct timeval __user *)argp);
1388                         break;
1389                 case SIOCGSTAMPNS:
1390                         rc = -EINVAL;
1391                         if (sk)
1392                                 rc = sock_get_timestampns(sk,
1393                                                 (struct timespec __user *)argp);
1394                         break;
1395                 case SIOCGIFADDR:
1396                 case SIOCSIFADDR:
1397                 case SIOCGIFDSTADDR:
1398                 case SIOCSIFDSTADDR:
1399                 case SIOCGIFBRDADDR:
1400                 case SIOCSIFBRDADDR:
1401                 case SIOCGIFNETMASK:
1402                 case SIOCSIFNETMASK:
1403                 case SIOCGIFMETRIC:
1404                 case SIOCSIFMETRIC:
1405                         rc = -EINVAL;
1406                         break;
1407                 case SIOCADDRT:
1408                 case SIOCDELRT:
1409                         rc = -EPERM;
1410                         if (!capable(CAP_NET_ADMIN))
1411                                 break;
1412                         rc = x25_route_ioctl(cmd, argp);
1413                         break;
1414                 case SIOCX25GSUBSCRIP:
1415                         rc = x25_subscr_ioctl(cmd, argp);
1416                         break;
1417                 case SIOCX25SSUBSCRIP:
1418                         rc = -EPERM;
1419                         if (!capable(CAP_NET_ADMIN))
1420                                 break;
1421                         rc = x25_subscr_ioctl(cmd, argp);
1422                         break;
1423                 case SIOCX25GFACILITIES: {
1424                         struct x25_facilities fac = x25->facilities;
1425                         rc = copy_to_user(argp, &fac,
1426                                           sizeof(fac)) ? -EFAULT : 0;
1427                         break;
1428                 }
1429
1430                 case SIOCX25SFACILITIES: {
1431                         struct x25_facilities facilities;
1432                         rc = -EFAULT;
1433                         if (copy_from_user(&facilities, argp,
1434                                            sizeof(facilities)))
1435                                 break;
1436                         rc = -EINVAL;
1437                         if (sk->sk_state != TCP_LISTEN &&
1438                             sk->sk_state != TCP_CLOSE)
1439                                 break;
1440                         if (facilities.pacsize_in < X25_PS16 ||
1441                             facilities.pacsize_in > X25_PS4096)
1442                                 break;
1443                         if (facilities.pacsize_out < X25_PS16 ||
1444                             facilities.pacsize_out > X25_PS4096)
1445                                 break;
1446                         if (facilities.winsize_in < 1 ||
1447                             facilities.winsize_in > 127)
1448                                 break;
1449                         if (facilities.throughput < 0x03 ||
1450                             facilities.throughput > 0xDD)
1451                                 break;
1452                         if (facilities.reverse &&
1453                                 (facilities.reverse & 0x81) != 0x81)
1454                                 break;
1455                         x25->facilities = facilities;
1456                         rc = 0;
1457                         break;
1458                 }
1459
1460                 case SIOCX25GDTEFACILITIES: {
1461                         rc = copy_to_user(argp, &x25->dte_facilities,
1462                                                 sizeof(x25->dte_facilities));
1463                         if (rc)
1464                                 rc = -EFAULT;
1465                         break;
1466                 }
1467
1468                 case SIOCX25SDTEFACILITIES: {
1469                         struct x25_dte_facilities dtefacs;
1470                         rc = -EFAULT;
1471                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1472                                 break;
1473                         rc = -EINVAL;
1474                         if (sk->sk_state != TCP_LISTEN &&
1475                                         sk->sk_state != TCP_CLOSE)
1476                                 break;
1477                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1478                                 break;
1479                         if (dtefacs.calling_ae == NULL)
1480                                 break;
1481                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1482                                 break;
1483                         if (dtefacs.called_ae == NULL)
1484                                 break;
1485                         x25->dte_facilities = dtefacs;
1486                         rc = 0;
1487                         break;
1488                 }
1489
1490                 case SIOCX25GCALLUSERDATA: {
1491                         struct x25_calluserdata cud = x25->calluserdata;
1492                         rc = copy_to_user(argp, &cud,
1493                                           sizeof(cud)) ? -EFAULT : 0;
1494                         break;
1495                 }
1496
1497                 case SIOCX25SCALLUSERDATA: {
1498                         struct x25_calluserdata calluserdata;
1499
1500                         rc = -EFAULT;
1501                         if (copy_from_user(&calluserdata, argp,
1502                                            sizeof(calluserdata)))
1503                                 break;
1504                         rc = -EINVAL;
1505                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1506                                 break;
1507                         x25->calluserdata = calluserdata;
1508                         rc = 0;
1509                         break;
1510                 }
1511
1512                 case SIOCX25GCAUSEDIAG: {
1513                         struct x25_causediag causediag;
1514                         causediag = x25->causediag;
1515                         rc = copy_to_user(argp, &causediag,
1516                                           sizeof(causediag)) ? -EFAULT : 0;
1517                         break;
1518                 }
1519
1520                 case SIOCX25SCAUSEDIAG: {
1521                         struct x25_causediag causediag;
1522                         rc = -EFAULT;
1523                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1524                                 break;
1525                         x25->causediag = causediag;
1526                         rc = 0;
1527                         break;
1528
1529                 }
1530
1531                 case SIOCX25SCUDMATCHLEN: {
1532                         struct x25_subaddr sub_addr;
1533                         rc = -EINVAL;
1534                         if(sk->sk_state != TCP_CLOSE)
1535                                 break;
1536                         rc = -EFAULT;
1537                         if (copy_from_user(&sub_addr, argp,
1538                                         sizeof(sub_addr)))
1539                                 break;
1540                         rc = -EINVAL;
1541                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1542                                 break;
1543                         x25->cudmatchlength = sub_addr.cudmatchlength;
1544                         rc = 0;
1545                         break;
1546                 }
1547
1548                 case SIOCX25CALLACCPTAPPRV: {
1549                         rc = -EINVAL;
1550                         if (sk->sk_state != TCP_CLOSE)
1551                                 break;
1552                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1553                         rc = 0;
1554                         break;
1555                 }
1556
1557                 case SIOCX25SENDCALLACCPT:  {
1558                         rc = -EINVAL;
1559                         if (sk->sk_state != TCP_ESTABLISHED)
1560                                 break;
1561                         if (x25->accptapprv)    /* must call accptapprv above */
1562                                 break;
1563                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1564                         x25->state = X25_STATE_3;
1565                         rc = 0;
1566                         break;
1567                 }
1568
1569                 default:
1570                         rc = -ENOIOCTLCMD;
1571                         break;
1572         }
1573         unlock_kernel();
1574
1575         return rc;
1576 }
1577
1578 static const struct net_proto_family x25_family_ops = {
1579         .family =       AF_X25,
1580         .create =       x25_create,
1581         .owner  =       THIS_MODULE,
1582 };
1583
1584 #ifdef CONFIG_COMPAT
1585 static int compat_x25_subscr_ioctl(unsigned int cmd,
1586                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1587 {
1588         struct compat_x25_subscrip_struct x25_subscr;
1589         struct x25_neigh *nb;
1590         struct net_device *dev;
1591         int rc = -EINVAL;
1592
1593         rc = -EFAULT;
1594         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1595                 goto out;
1596
1597         rc = -EINVAL;
1598         dev = x25_dev_get(x25_subscr.device);
1599         if (dev == NULL)
1600                 goto out;
1601
1602         nb = x25_get_neigh(dev);
1603         if (nb == NULL)
1604                 goto out_dev_put;
1605
1606         dev_put(dev);
1607
1608         if (cmd == SIOCX25GSUBSCRIP) {
1609                 x25_subscr.extended = nb->extended;
1610                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1611                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1612                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1613         } else {
1614                 rc = -EINVAL;
1615                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1616                         rc = 0;
1617                         nb->extended = x25_subscr.extended;
1618                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1619                 }
1620         }
1621         x25_neigh_put(nb);
1622 out:
1623         return rc;
1624 out_dev_put:
1625         dev_put(dev);
1626         goto out;
1627 }
1628
1629 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1630                                 unsigned long arg)
1631 {
1632         void __user *argp = compat_ptr(arg);
1633         struct sock *sk = sock->sk;
1634
1635         int rc = -ENOIOCTLCMD;
1636
1637         switch(cmd) {
1638         case TIOCOUTQ:
1639         case TIOCINQ:
1640                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1641                 break;
1642         case SIOCGSTAMP:
1643                 rc = -EINVAL;
1644                 lock_kernel();
1645                 if (sk)
1646                         rc = compat_sock_get_timestamp(sk,
1647                                         (struct timeval __user*)argp);
1648                 unlock_kernel();
1649                 break;
1650         case SIOCGSTAMPNS:
1651                 rc = -EINVAL;
1652                 lock_kernel();
1653                 if (sk)
1654                         rc = compat_sock_get_timestampns(sk,
1655                                         (struct timespec __user*)argp);
1656                 unlock_kernel();
1657                 break;
1658         case SIOCGIFADDR:
1659         case SIOCSIFADDR:
1660         case SIOCGIFDSTADDR:
1661         case SIOCSIFDSTADDR:
1662         case SIOCGIFBRDADDR:
1663         case SIOCSIFBRDADDR:
1664         case SIOCGIFNETMASK:
1665         case SIOCSIFNETMASK:
1666         case SIOCGIFMETRIC:
1667         case SIOCSIFMETRIC:
1668                 rc = -EINVAL;
1669                 break;
1670         case SIOCADDRT:
1671         case SIOCDELRT:
1672                 rc = -EPERM;
1673                 if (!capable(CAP_NET_ADMIN))
1674                         break;
1675                 lock_kernel();
1676                 rc = x25_route_ioctl(cmd, argp);
1677                 unlock_kernel();
1678                 break;
1679         case SIOCX25GSUBSCRIP:
1680                 lock_kernel();
1681                 rc = compat_x25_subscr_ioctl(cmd, argp);
1682                 unlock_kernel();
1683                 break;
1684         case SIOCX25SSUBSCRIP:
1685                 rc = -EPERM;
1686                 if (!capable(CAP_NET_ADMIN))
1687                         break;
1688                 lock_kernel();
1689                 rc = compat_x25_subscr_ioctl(cmd, argp);
1690                 unlock_kernel();
1691                 break;
1692         case SIOCX25GFACILITIES:
1693         case SIOCX25SFACILITIES:
1694         case SIOCX25GDTEFACILITIES:
1695         case SIOCX25SDTEFACILITIES:
1696         case SIOCX25GCALLUSERDATA:
1697         case SIOCX25SCALLUSERDATA:
1698         case SIOCX25GCAUSEDIAG:
1699         case SIOCX25SCAUSEDIAG:
1700         case SIOCX25SCUDMATCHLEN:
1701         case SIOCX25CALLACCPTAPPRV:
1702         case SIOCX25SENDCALLACCPT:
1703                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1704                 break;
1705         default:
1706                 rc = -ENOIOCTLCMD;
1707                 break;
1708         }
1709         return rc;
1710 }
1711 #endif
1712
1713 static const struct proto_ops x25_proto_ops = {
1714         .family =       AF_X25,
1715         .owner =        THIS_MODULE,
1716         .release =      x25_release,
1717         .bind =         x25_bind,
1718         .connect =      x25_connect,
1719         .socketpair =   sock_no_socketpair,
1720         .accept =       x25_accept,
1721         .getname =      x25_getname,
1722         .poll =         x25_datagram_poll,
1723         .ioctl =        x25_ioctl,
1724 #ifdef CONFIG_COMPAT
1725         .compat_ioctl = compat_x25_ioctl,
1726 #endif
1727         .listen =       x25_listen,
1728         .shutdown =     sock_no_shutdown,
1729         .setsockopt =   x25_setsockopt,
1730         .getsockopt =   x25_getsockopt,
1731         .sendmsg =      x25_sendmsg,
1732         .recvmsg =      x25_recvmsg,
1733         .mmap =         sock_no_mmap,
1734         .sendpage =     sock_no_sendpage,
1735 };
1736
1737 static struct packet_type x25_packet_type __read_mostly = {
1738         .type = cpu_to_be16(ETH_P_X25),
1739         .func = x25_lapb_receive_frame,
1740 };
1741
1742 static struct notifier_block x25_dev_notifier = {
1743         .notifier_call = x25_device_event,
1744 };
1745
1746 void x25_kill_by_neigh(struct x25_neigh *nb)
1747 {
1748         struct sock *s;
1749         struct hlist_node *node;
1750
1751         write_lock_bh(&x25_list_lock);
1752
1753         sk_for_each(s, node, &x25_list)
1754                 if (x25_sk(s)->neighbour == nb)
1755                         x25_disconnect(s, ENETUNREACH, 0, 0);
1756
1757         write_unlock_bh(&x25_list_lock);
1758
1759         /* Remove any related forwards */
1760         x25_clear_forward_by_dev(nb->dev);
1761 }
1762
1763 static int __init x25_init(void)
1764 {
1765         int rc = proto_register(&x25_proto, 0);
1766
1767         if (rc != 0)
1768                 goto out;
1769
1770         rc = sock_register(&x25_family_ops);
1771         if (rc != 0)
1772                 goto out_proto;
1773
1774         dev_add_pack(&x25_packet_type);
1775
1776         rc = register_netdevice_notifier(&x25_dev_notifier);
1777         if (rc != 0)
1778                 goto out_sock;
1779
1780         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1781
1782         x25_register_sysctl();
1783         rc = x25_proc_init();
1784         if (rc != 0)
1785                 goto out_dev;
1786 out:
1787         return rc;
1788 out_dev:
1789         unregister_netdevice_notifier(&x25_dev_notifier);
1790 out_sock:
1791         sock_unregister(AF_X25);
1792 out_proto:
1793         proto_unregister(&x25_proto);
1794         goto out;
1795 }
1796 module_init(x25_init);
1797
1798 static void __exit x25_exit(void)
1799 {
1800         x25_proc_exit();
1801         x25_link_free();
1802         x25_route_free();
1803
1804         x25_unregister_sysctl();
1805
1806         unregister_netdevice_notifier(&x25_dev_notifier);
1807
1808         dev_remove_pack(&x25_packet_type);
1809
1810         sock_unregister(AF_X25);
1811         proto_unregister(&x25_proto);
1812 }
1813 module_exit(x25_exit);
1814
1815 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1816 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1817 MODULE_LICENSE("GPL");
1818 MODULE_ALIAS_NETPROTO(PF_X25);