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 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  85                   struct x25_address *calling_addr)
  86 {
  87         unsigned int called_len, calling_len;
  88         char *called, *calling;
  89         unsigned int i;
  90
  91         called_len  = (*p >> 0) & 0x0F;
  92         calling_len = (*p >> 4) & 0x0F;
  93
  94         called  = called_addr->x25_addr;
  95         calling = calling_addr->x25_addr;
  96         p++;
  97
  98         for (i = 0; i < (called_len + calling_len); i++) {
  99                 if (i < called_len) {
 100                         if (i % 2 != 0) {
 101                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 102                                 p++;
 103                         } else {
 104                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 105                         }
 106                 } else {
 107                         if (i % 2 != 0) {
 108                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 109                                 p++;
 110                         } else {
 111                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 112                         }
 113                 }
 114         }
 115
 116         *called = *calling = '\0';
 117
 118         return 1 + (called_len + calling_len + 1) / 2;
 119 }
 120
 121 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 122                   struct x25_address *calling_addr)
 123 {
 124         unsigned int called_len, calling_len;
 125         char *called, *calling;
 126         int i;
 127
 128         called  = called_addr->x25_addr;
 129         calling = calling_addr->x25_addr;
 130
 131         called_len  = strlen(called);
 132         calling_len = strlen(calling);
 133
 134         *p++ = (calling_len << 4) | (called_len << 0);
 135
 136         for (i = 0; i < (called_len + calling_len); i++) {
 137                 if (i < called_len) {
 138                         if (i % 2 != 0) {
 139                                 *p |= (*called++ - '0') << 0;
 140                                 p++;
 141                         } else {
 142                                 *p = 0x00;
 143                                 *p |= (*called++ - '0') << 4;
 144                         }
 145                 } else {
 146                         if (i % 2 != 0) {
 147                                 *p |= (*calling++ - '0') << 0;
 148                                 p++;
 149                         } else {
 150                                 *p = 0x00;
 151                                 *p |= (*calling++ - '0') << 4;
 152                         }
 153                 }
 154         }
 155
 156         return 1 + (called_len + calling_len + 1) / 2;
 157 }
 158
 159 /*
 160  *      Socket removal during an interrupt is now safe.
 161  */
 162 static void x25_remove_socket(struct sock *sk)
 163 {
 164         write_lock_bh(&x25_list_lock);
 165         sk_del_node_init(sk);
 166         write_unlock_bh(&x25_list_lock);
 167 }
 168
 169 /*
 170  *      Kill all bound sockets on a dropped device.
 171  */
 172 static void x25_kill_by_device(struct net_device *dev)
 173 {
 174         struct sock *s;
 175         struct hlist_node *node;
 176
 177         write_lock_bh(&x25_list_lock);
 178
 179         sk_for_each(s, node, &x25_list)
 180                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 181                         x25_disconnect(s, ENETUNREACH, 0, 0);
 182
 183         write_unlock_bh(&x25_list_lock);
 184 }
 185
 186 /*
 187  *      Handle device status changes.
 188  */
 189 static int x25_device_event(struct notifier_block *this, unsigned long event,
 190                             void *ptr)
 191 {
 192         struct net_device *dev = ptr;
 193         struct x25_neigh *nb;
 194
 195         if (!net_eq(dev_net(dev), &init_net))
 196                 return NOTIFY_DONE;
 197
 198         if (dev->type == ARPHRD_X25
 199 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 200          || dev->type == ARPHRD_ETHER
 201 #endif
 202          ) {
 203                 switch (event) {
 204                         case NETDEV_UP:
 205                                 x25_link_device_up(dev);
 206                                 break;
 207                         case NETDEV_GOING_DOWN:
 208                                 nb = x25_get_neigh(dev);
 209                                 if (nb) {
 210                                         x25_terminate_link(nb);
 211                                         x25_neigh_put(nb);
 212                                 }
 213                                 break;
 214                         case NETDEV_DOWN:
 215                                 x25_kill_by_device(dev);
 216                                 x25_route_device_down(dev);
 217                                 x25_link_device_down(dev);
 218                                 break;
 219                 }
 220         }
 221
 222         return NOTIFY_DONE;
 223 }
 224
 225 /*
 226  *      Add a socket to the bound sockets list.
 227  */
 228 static void x25_insert_socket(struct sock *sk)
 229 {
 230         write_lock_bh(&x25_list_lock);
 231         sk_add_node(sk, &x25_list);
 232         write_unlock_bh(&x25_list_lock);
 233 }
 234
 235 /*
 236  *      Find a socket that wants to accept the Call Request we just
 237  *      received. Check the full list for an address/cud match.
 238  *      If no cuds match return the next_best thing, an address match.
 239  *      Note: if a listening socket has cud set it must only get calls
 240  *      with matching cud.
 241  */
 242 static struct sock *x25_find_listener(struct x25_address *addr,
 243                                         struct sk_buff *skb)
 244 {
 245         struct sock *s;
 246         struct sock *next_best;
 247         struct hlist_node *node;
 248
 249         read_lock_bh(&x25_list_lock);
 250         next_best = NULL;
 251
 252         sk_for_each(s, node, &x25_list)
 253                 if ((!strcmp(addr->x25_addr,
 254                         x25_sk(s)->source_addr.x25_addr) ||
 255                                 !strcmp(addr->x25_addr,
 256                                         null_x25_address.x25_addr)) &&
 257                                         s->sk_state == TCP_LISTEN) {
 258                         /*
 259                          * Found a listening socket, now check the incoming
 260                          * call user data vs this sockets call user data
 261                          */
 262                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 263                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 264                                         skb->data,
 265                                         x25_sk(s)->cudmatchlength)) == 0) {
 266                                         sock_hold(s);
 267                                         goto found;
 268                                  }
 269                         } else
 270                                 next_best = s;
 271                 }
 272         if (next_best) {
 273                 s = next_best;
 274                 sock_hold(s);
 275                 goto found;
 276         }
 277         s = NULL;
 278 found:
 279         read_unlock_bh(&x25_list_lock);
 280         return s;
 281 }
 282
 283 /*
 284  *      Find a connected X.25 socket given my LCI and neighbour.
 285  */
 286 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 287 {
 288         struct sock *s;
 289         struct hlist_node *node;
 290
 291         sk_for_each(s, node, &x25_list)
 292                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 293                         sock_hold(s);
 294                         goto found;
 295                 }
 296         s = NULL;
 297 found:
 298         return s;
 299 }
 300
 301 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 302 {
 303         struct sock *s;
 304
 305         read_lock_bh(&x25_list_lock);
 306         s = __x25_find_socket(lci, nb);
 307         read_unlock_bh(&x25_list_lock);
 308         return s;
 309 }
 310
 311 /*
 312  *      Find a unique LCI for a given device.
 313  */
 314 static unsigned int x25_new_lci(struct x25_neigh *nb)
 315 {
 316         unsigned int lci = 1;
 317         struct sock *sk;
 318
 319         read_lock_bh(&x25_list_lock);
 320
 321         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 322                 sock_put(sk);
 323                 if (++lci == 4096) {
 324                         lci = 0;
 325                         break;
 326                 }
 327         }
 328
 329         read_unlock_bh(&x25_list_lock);
 330         return lci;
 331 }
 332
 333 /*
 334  *      Deferred destroy.
 335  */
 336 static void __x25_destroy_socket(struct sock *);
 337
 338 /*
 339  *      handler for deferred kills.
 340  */
 341 static void x25_destroy_timer(unsigned long data)
 342 {
 343         x25_destroy_socket_from_timer((struct sock *)data);
 344 }
 345
 346 /*
 347  *      This is called from user mode and the timers. Thus it protects itself
 348  *      against interrupt users but doesn't worry about being called during
 349  *      work. Once it is removed from the queue no interrupt or bottom half
 350  *      will touch it and we are (fairly 8-) ) safe.
 351  *      Not static as it's used by the timer
 352  */
 353 static void __x25_destroy_socket(struct sock *sk)
 354 {
 355         struct sk_buff *skb;
 356
 357         x25_stop_heartbeat(sk);
 358         x25_stop_timer(sk);
 359
 360         x25_remove_socket(sk);
 361         x25_clear_queues(sk);           /* Flush the queues */
 362
 363         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 364                 if (skb->sk != sk) {            /* A pending connection */
 365                         /*
 366                          * Queue the unaccepted socket for death
 367                          */
 368                         sock_set_flag(skb->sk, SOCK_DEAD);
 369                         x25_start_heartbeat(skb->sk);
 370                         x25_sk(skb->sk)->state = X25_STATE_0;
 371                 }
 372
 373                 kfree_skb(skb);
 374         }
 375
 376         if (sk_has_allocations(sk)) {
 377                 /* Defer: outstanding buffers */
 378                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 379                 sk->sk_timer.function = x25_destroy_timer;
 380                 sk->sk_timer.data = (unsigned long)sk;
 381                 add_timer(&sk->sk_timer);
 382         } else {
 383                 /* drop last reference so sock_put will free */
 384                 __sock_put(sk);
 385         }
 386 }
 387
 388 void x25_destroy_socket_from_timer(struct sock *sk)
 389 {
 390         sock_hold(sk);
 391         bh_lock_sock(sk);
 392         __x25_destroy_socket(sk);
 393         bh_unlock_sock(sk);
 394         sock_put(sk);
 395 }
 396
 397 static void x25_destroy_socket(struct sock *sk)
 398 {
 399         sock_hold(sk);
 400         lock_sock(sk);
 401         __x25_destroy_socket(sk);
 402         release_sock(sk);
 403         sock_put(sk);
 404 }
 405
 406 /*
 407  *      Handling for system calls applied via the various interfaces to a
 408  *      X.25 socket object.
 409  */
 410
 411 static int x25_setsockopt(struct socket *sock, int level, int optname,
 412                           char __user *optval, unsigned int optlen)
 413 {
 414         int opt;
 415         struct sock *sk = sock->sk;
 416         int rc = -ENOPROTOOPT;
 417
 418         lock_kernel();
 419         if (level != SOL_X25 || optname != X25_QBITINCL)
 420                 goto out;
 421
 422         rc = -EINVAL;
 423         if (optlen < sizeof(int))
 424                 goto out;
 425
 426         rc = -EFAULT;
 427         if (get_user(opt, (int __user *)optval))
 428                 goto out;
 429
 430         x25_sk(sk)->qbitincl = !!opt;
 431         rc = 0;
 432 out:
 433         unlock_kernel();
 434         return rc;
 435 }
 436
 437 static int x25_getsockopt(struct socket *sock, int level, int optname,
 438                           char __user *optval, int __user *optlen)
 439 {
 440         struct sock *sk = sock->sk;
 441         int val, len, rc = -ENOPROTOOPT;
 442
 443         lock_kernel();
 444         if (level != SOL_X25 || optname != X25_QBITINCL)
 445                 goto out;
 446
 447         rc = -EFAULT;
 448         if (get_user(len, optlen))
 449                 goto out;
 450
 451         len = min_t(unsigned int, len, sizeof(int));
 452
 453         rc = -EINVAL;
 454         if (len < 0)
 455                 goto out;
 456
 457         rc = -EFAULT;
 458         if (put_user(len, optlen))
 459                 goto out;
 460
 461         val = x25_sk(sk)->qbitincl;
 462         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 463 out:
 464         unlock_kernel();
 465         return rc;
 466 }
 467
 468 static int x25_listen(struct socket *sock, int backlog)
 469 {
 470         struct sock *sk = sock->sk;
 471         int rc = -EOPNOTSUPP;
 472
 473         lock_kernel();
 474         if (sk->sk_state != TCP_LISTEN) {
 475                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 476                 sk->sk_max_ack_backlog = backlog;
 477                 sk->sk_state           = TCP_LISTEN;
 478                 rc = 0;
 479         }
 480         unlock_kernel();
 481
 482         return rc;
 483 }
 484
 485 static struct proto x25_proto = {
 486         .name     = "X25",
 487         .owner    = THIS_MODULE,
 488         .obj_size = sizeof(struct x25_sock),
 489 };
 490
 491 static struct sock *x25_alloc_socket(struct net *net)
 492 {
 493         struct x25_sock *x25;
 494         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 495
 496         if (!sk)
 497                 goto out;
 498
 499         sock_init_data(NULL, sk);
 500
 501         x25 = x25_sk(sk);
 502         skb_queue_head_init(&x25->ack_queue);
 503         skb_queue_head_init(&x25->fragment_queue);
 504         skb_queue_head_init(&x25->interrupt_in_queue);
 505         skb_queue_head_init(&x25->interrupt_out_queue);
 506 out:
 507         return sk;
 508 }
 509
 510 static int x25_create(struct net *net, struct socket *sock, int protocol,
 511                       int kern)
 512 {
 513         struct sock *sk;
 514         struct x25_sock *x25;
 515         int rc = -ESOCKTNOSUPPORT;
 516
 517         if (!net_eq(net, &init_net))
 518                 return -EAFNOSUPPORT;
 519
 520         if (sock->type != SOCK_SEQPACKET || protocol)
 521                 goto out;
 522
 523         rc = -ENOMEM;
 524         if ((sk = x25_alloc_socket(net)) == NULL)
 525                 goto out;
 526
 527         x25 = x25_sk(sk);
 528
 529         sock_init_data(sock, sk);
 530
 531         x25_init_timers(sk);
 532
 533         sock->ops    = &x25_proto_ops;
 534         sk->sk_protocol = protocol;
 535         sk->sk_backlog_rcv = x25_backlog_rcv;
 536
 537         x25->t21   = sysctl_x25_call_request_timeout;
 538         x25->t22   = sysctl_x25_reset_request_timeout;
 539         x25->t23   = sysctl_x25_clear_request_timeout;
 540         x25->t2    = sysctl_x25_ack_holdback_timeout;
 541         x25->state = X25_STATE_0;
 542         x25->cudmatchlength = 0;
 543         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 544                                                         /* on call accept   */
 545
 546         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 547         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 548         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 549         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 550         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 551         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 552         x25->dte_facilities.calling_len = 0;
 553         x25->dte_facilities.called_len = 0;
 554         memset(x25->dte_facilities.called_ae, '\0',
 555                         sizeof(x25->dte_facilities.called_ae));
 556         memset(x25->dte_facilities.calling_ae, '\0',
 557                         sizeof(x25->dte_facilities.calling_ae));
 558
 559         rc = 0;
 560 out:
 561         return rc;
 562 }
 563
 564 static struct sock *x25_make_new(struct sock *osk)
 565 {
 566         struct sock *sk = NULL;
 567         struct x25_sock *x25, *ox25;
 568
 569         if (osk->sk_type != SOCK_SEQPACKET)
 570                 goto out;
 571
 572         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 573                 goto out;
 574
 575         x25 = x25_sk(sk);
 576
 577         sk->sk_type        = osk->sk_type;
 578         sk->sk_priority    = osk->sk_priority;
 579         sk->sk_protocol    = osk->sk_protocol;
 580         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 581         sk->sk_sndbuf      = osk->sk_sndbuf;
 582         sk->sk_state       = TCP_ESTABLISHED;
 583         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 584         sock_copy_flags(sk, osk);
 585
 586         ox25 = x25_sk(osk);
 587         x25->t21        = ox25->t21;
 588         x25->t22        = ox25->t22;
 589         x25->t23        = ox25->t23;
 590         x25->t2         = ox25->t2;
 591         x25->facilities = ox25->facilities;
 592         x25->qbitincl   = ox25->qbitincl;
 593         x25->dte_facilities = ox25->dte_facilities;
 594         x25->cudmatchlength = ox25->cudmatchlength;
 595         x25->accptapprv = ox25->accptapprv;
 596
 597         x25_init_timers(sk);
 598 out:
 599         return sk;
 600 }
 601
 602 static int x25_release(struct socket *sock)
 603 {
 604         struct sock *sk = sock->sk;
 605         struct x25_sock *x25;
 606
 607         lock_kernel();
 608         if (!sk)
 609                 goto out;
 610
 611         x25 = x25_sk(sk);
 612
 613         switch (x25->state) {
 614
 615                 case X25_STATE_0:
 616                 case X25_STATE_2:
 617                         x25_disconnect(sk, 0, 0, 0);
 618                         x25_destroy_socket(sk);
 619                         goto out;
 620
 621                 case X25_STATE_1:
 622                 case X25_STATE_3:
 623                 case X25_STATE_4:
 624                         x25_clear_queues(sk);
 625                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 626                         x25_start_t23timer(sk);
 627                         x25->state = X25_STATE_2;
 628                         sk->sk_state    = TCP_CLOSE;
 629                         sk->sk_shutdown |= SEND_SHUTDOWN;
 630                         sk->sk_state_change(sk);
 631                         sock_set_flag(sk, SOCK_DEAD);
 632                         sock_set_flag(sk, SOCK_DESTROY);
 633                         break;
 634         }
 635
 636         sock_orphan(sk);
 637 out:
 638         unlock_kernel();
 639         return 0;
 640 }
 641
 642 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 643 {
 644         struct sock *sk = sock->sk;
 645         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 646         int rc = 0;
 647
 648         lock_kernel();
 649         if (!sock_flag(sk, SOCK_ZAPPED) ||
 650             addr_len != sizeof(struct sockaddr_x25) ||
 651             addr->sx25_family != AF_X25) {
 652                 rc = -EINVAL;
 653                 goto out;
 654         }
 655
 656         x25_sk(sk)->source_addr = addr->sx25_addr;
 657         x25_insert_socket(sk);
 658         sock_reset_flag(sk, SOCK_ZAPPED);
 659         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 660 out:
 661         unlock_kernel();
 662         return rc;
 663 }
 664
 665 static int x25_wait_for_connection_establishment(struct sock *sk)
 666 {
 667         DECLARE_WAITQUEUE(wait, current);
 668         int rc;
 669
 670         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 671         for (;;) {
 672                 __set_current_state(TASK_INTERRUPTIBLE);
 673                 rc = -ERESTARTSYS;
 674                 if (signal_pending(current))
 675                         break;
 676                 rc = sock_error(sk);
 677                 if (rc) {
 678                         sk->sk_socket->state = SS_UNCONNECTED;
 679                         break;
 680                 }
 681                 rc = 0;
 682                 if (sk->sk_state != TCP_ESTABLISHED) {
 683                         release_sock(sk);
 684                         schedule();
 685                         lock_sock(sk);
 686                 } else
 687                         break;
 688         }
 689         __set_current_state(TASK_RUNNING);
 690         remove_wait_queue(sk->sk_sleep, &wait);
 691         return rc;
 692 }
 693
 694 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 695                        int addr_len, int flags)
 696 {
 697         struct sock *sk = sock->sk;
 698         struct x25_sock *x25 = x25_sk(sk);
 699         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 700         struct x25_route *rt;
 701         int rc = 0;
 702
 703         lock_kernel();
 704         lock_sock(sk);
 705         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 706                 sock->state = SS_CONNECTED;
 707                 goto out; /* Connect completed during a ERESTARTSYS event */
 708         }
 709
 710         rc = -ECONNREFUSED;
 711         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 712                 sock->state = SS_UNCONNECTED;
 713                 goto out;
 714         }
 715
 716         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 717         if (sk->sk_state == TCP_ESTABLISHED)
 718                 goto out;
 719
 720         sk->sk_state   = TCP_CLOSE;
 721         sock->state = SS_UNCONNECTED;
 722
 723         rc = -EINVAL;
 724         if (addr_len != sizeof(struct sockaddr_x25) ||
 725             addr->sx25_family != AF_X25)
 726                 goto out;
 727
 728         rc = -ENETUNREACH;
 729         rt = x25_get_route(&addr->sx25_addr);
 730         if (!rt)
 731                 goto out;
 732
 733         x25->neighbour = x25_get_neigh(rt->dev);
 734         if (!x25->neighbour)
 735                 goto out_put_route;
 736
 737         x25_limit_facilities(&x25->facilities, x25->neighbour);
 738
 739         x25->lci = x25_new_lci(x25->neighbour);
 740         if (!x25->lci)
 741                 goto out_put_neigh;
 742
 743         rc = -EINVAL;
 744         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 745                 goto out_put_neigh;
 746
 747         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 748                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 749
 750         x25->dest_addr = addr->sx25_addr;
 751
 752         /* Move to connecting socket, start sending Connect Requests */
 753         sock->state   = SS_CONNECTING;
 754         sk->sk_state  = TCP_SYN_SENT;
 755
 756         x25->state = X25_STATE_1;
 757
 758         x25_write_internal(sk, X25_CALL_REQUEST);
 759
 760         x25_start_heartbeat(sk);
 761         x25_start_t21timer(sk);
 762
 763         /* Now the loop */
 764         rc = -EINPROGRESS;
 765         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 766                 goto out_put_neigh;
 767
 768         rc = x25_wait_for_connection_establishment(sk);
 769         if (rc)
 770                 goto out_put_neigh;
 771
 772         sock->state = SS_CONNECTED;
 773         rc = 0;
 774 out_put_neigh:
 775         if (rc)
 776                 x25_neigh_put(x25->neighbour);
 777 out_put_route:
 778         x25_route_put(rt);
 779 out:
 780         release_sock(sk);
 781         unlock_kernel();
 782         return rc;
 783 }
 784
 785 static int x25_wait_for_data(struct sock *sk, long timeout)
 786 {
 787         DECLARE_WAITQUEUE(wait, current);
 788         int rc = 0;
 789
 790         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 791         for (;;) {
 792                 __set_current_state(TASK_INTERRUPTIBLE);
 793                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 794                         break;
 795                 rc = -ERESTARTSYS;
 796                 if (signal_pending(current))
 797                         break;
 798                 rc = -EAGAIN;
 799                 if (!timeout)
 800                         break;
 801                 rc = 0;
 802                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 803                         release_sock(sk);
 804                         timeout = schedule_timeout(timeout);
 805                         lock_sock(sk);
 806                 } else
 807                         break;
 808         }
 809         __set_current_state(TASK_RUNNING);
 810         remove_wait_queue(sk->sk_sleep, &wait);
 811         return rc;
 812 }
 813
 814 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 815 {
 816         struct sock *sk = sock->sk;
 817         struct sock *newsk;
 818         struct sk_buff *skb;
 819         int rc = -EINVAL;
 820
 821         lock_kernel();
 822         if (!sk || sk->sk_state != TCP_LISTEN)
 823                 goto out;
 824
 825         rc = -EOPNOTSUPP;
 826         if (sk->sk_type != SOCK_SEQPACKET)
 827                 goto out;
 828
 829         lock_sock(sk);
 830         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 831         if (rc)
 832                 goto out2;
 833         skb = skb_dequeue(&sk->sk_receive_queue);
 834         rc = -EINVAL;
 835         if (!skb->sk)
 836                 goto out2;
 837         newsk            = skb->sk;
 838         sock_graft(newsk, newsock);
 839
 840         /* Now attach up the new socket */
 841         skb->sk = NULL;
 842         kfree_skb(skb);
 843         sk->sk_ack_backlog--;
 844         newsock->state = SS_CONNECTED;
 845         rc = 0;
 846 out2:
 847         release_sock(sk);
 848 out:
 849         unlock_kernel();
 850         return rc;
 851 }
 852
 853 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 854                        int *uaddr_len, int peer)
 855 {
 856         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 857         struct sock *sk = sock->sk;
 858         struct x25_sock *x25 = x25_sk(sk);
 859         int rc = 0;
 860
 861         lock_kernel();
 862         if (peer) {
 863                 if (sk->sk_state != TCP_ESTABLISHED) {
 864                         rc = -ENOTCONN;
 865                         goto out;
 866                 }
 867                 sx25->sx25_addr = x25->dest_addr;
 868         } else
 869                 sx25->sx25_addr = x25->source_addr;
 870
 871         sx25->sx25_family = AF_X25;
 872         *uaddr_len = sizeof(*sx25);
 873
 874 out:
 875         unlock_kernel();
 876         return rc;
 877 }
 878
 879 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
 880                            poll_table *wait)
 881 {
 882         int rc;
 883
 884         lock_kernel();
 885         rc = datagram_poll(file, sock, wait);
 886         unlock_kernel();
 887
 888         return rc;
 889 }
 890
 891 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 892                         unsigned int lci)
 893 {
 894         struct sock *sk;
 895         struct sock *make;
 896         struct x25_sock *makex25;
 897         struct x25_address source_addr, dest_addr;
 898         struct x25_facilities facilities;
 899         struct x25_dte_facilities dte_facilities;
 900         int len, addr_len, rc;
 901
 902         /*
 903          *      Remove the LCI and frame type.
 904          */
 905         skb_pull(skb, X25_STD_MIN_LEN);
 906
 907         /*
 908          *      Extract the X.25 addresses and convert them to ASCII strings,
 909          *      and remove them.
 910          */
 911         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 912         skb_pull(skb, addr_len);
 913
 914         /*
 915          *      Get the length of the facilities, skip past them for the moment
 916          *      get the call user data because this is needed to determine
 917          *      the correct listener
 918          */
 919         len = skb->data[0] + 1;
 920         skb_pull(skb,len);
 921
 922         /*
 923          *      Find a listener for the particular address/cud pair.
 924          */
 925         sk = x25_find_listener(&source_addr,skb);
 926         skb_push(skb,len);
 927
 928         if (sk != NULL && sk_acceptq_is_full(sk)) {
 929                 goto out_sock_put;
 930         }
 931
 932         /*
 933          *      We dont have any listeners for this incoming call.
 934          *      Try forwarding it.
 935          */
 936         if (sk == NULL) {
 937                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 938                 if (sysctl_x25_forward &&
 939                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 940                 {
 941                         /* Call was forwarded, dont process it any more */
 942                         kfree_skb(skb);
 943                         rc = 1;
 944                         goto out;
 945                 } else {
 946                         /* No listeners, can't forward, clear the call */
 947                         goto out_clear_request;
 948                 }
 949         }
 950
 951         /*
 952          *      Try to reach a compromise on the requested facilities.
 953          */
 954         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 955         if (len == -1)
 956                 goto out_sock_put;
 957
 958         /*
 959          * current neighbour/link might impose additional limits
 960          * on certain facilties
 961          */
 962
 963         x25_limit_facilities(&facilities, nb);
 964
 965         /*
 966          *      Try to create a new socket.
 967          */
 968         make = x25_make_new(sk);
 969         if (!make)
 970                 goto out_sock_put;
 971
 972         /*
 973          *      Remove the facilities
 974          */
 975         skb_pull(skb, len);
 976
 977         skb->sk     = make;
 978         make->sk_state = TCP_ESTABLISHED;
 979
 980         makex25 = x25_sk(make);
 981         makex25->lci           = lci;
 982         makex25->dest_addr     = dest_addr;
 983         makex25->source_addr   = source_addr;
 984         makex25->neighbour     = nb;
 985         makex25->facilities    = facilities;
 986         makex25->dte_facilities= dte_facilities;
 987         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 988         /* ensure no reverse facil on accept */
 989         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 990         /* ensure no calling address extension on accept */
 991         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 992         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 993
 994         /* Normally all calls are accepted immediatly */
 995         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 996                 x25_write_internal(make, X25_CALL_ACCEPTED);
 997                 makex25->state = X25_STATE_3;
 998         }
 999
1000         /*
1001          *      Incoming Call User Data.
1002          */
1003         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1004         makex25->calluserdata.cudlength = skb->len;
1005
1006         sk->sk_ack_backlog++;
1007
1008         x25_insert_socket(make);
1009
1010         skb_queue_head(&sk->sk_receive_queue, skb);
1011
1012         x25_start_heartbeat(make);
1013
1014         if (!sock_flag(sk, SOCK_DEAD))
1015                 sk->sk_data_ready(sk, skb->len);
1016         rc = 1;
1017         sock_put(sk);
1018 out:
1019         return rc;
1020 out_sock_put:
1021         sock_put(sk);
1022 out_clear_request:
1023         rc = 0;
1024         x25_transmit_clear_request(nb, lci, 0x01);
1025         goto out;
1026 }
1027
1028 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1029                        struct msghdr *msg, size_t len)
1030 {
1031         struct sock *sk = sock->sk;
1032         struct x25_sock *x25 = x25_sk(sk);
1033         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1034         struct sockaddr_x25 sx25;
1035         struct sk_buff *skb;
1036         unsigned char *asmptr;
1037         int noblock = msg->msg_flags & MSG_DONTWAIT;
1038         size_t size;
1039         int qbit = 0, rc = -EINVAL;
1040
1041         lock_kernel();
1042         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1043                 goto out;
1044
1045         /* we currently don't support segmented records at the user interface */
1046         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1047                 goto out;
1048
1049         rc = -EADDRNOTAVAIL;
1050         if (sock_flag(sk, SOCK_ZAPPED))
1051                 goto out;
1052
1053         rc = -EPIPE;
1054         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1055                 send_sig(SIGPIPE, current, 0);
1056                 goto out;
1057         }
1058
1059         rc = -ENETUNREACH;
1060         if (!x25->neighbour)
1061                 goto out;
1062
1063         if (usx25) {
1064                 rc = -EINVAL;
1065                 if (msg->msg_namelen < sizeof(sx25))
1066                         goto out;
1067                 memcpy(&sx25, usx25, sizeof(sx25));
1068                 rc = -EISCONN;
1069                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1070                         goto out;
1071                 rc = -EINVAL;
1072                 if (sx25.sx25_family != AF_X25)
1073                         goto out;
1074         } else {
1075                 /*
1076                  *      FIXME 1003.1g - if the socket is like this because
1077                  *      it has become closed (not started closed) we ought
1078                  *      to SIGPIPE, EPIPE;
1079                  */
1080                 rc = -ENOTCONN;
1081                 if (sk->sk_state != TCP_ESTABLISHED)
1082                         goto out;
1083
1084                 sx25.sx25_family = AF_X25;
1085                 sx25.sx25_addr   = x25->dest_addr;
1086         }
1087
1088         /* Sanity check the packet size */
1089         if (len > 65535) {
1090                 rc = -EMSGSIZE;
1091                 goto out;
1092         }
1093
1094         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1095
1096         /* Build a packet */
1097         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1098
1099         if ((msg->msg_flags & MSG_OOB) && len > 32)
1100                 len = 32;
1101
1102         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1103
1104         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1105         if (!skb)
1106                 goto out;
1107         X25_SKB_CB(skb)->flags = msg->msg_flags;
1108
1109         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1110
1111         /*
1112          *      Put the data on the end
1113          */
1114         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1115
1116         skb_reset_transport_header(skb);
1117         skb_put(skb, len);
1118
1119         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1120         if (rc)
1121                 goto out_kfree_skb;
1122
1123         /*
1124          *      If the Q BIT Include socket option is in force, the first
1125          *      byte of the user data is the logical value of the Q Bit.
1126          */
1127         if (x25->qbitincl) {
1128                 qbit = skb->data[0];
1129                 skb_pull(skb, 1);
1130         }
1131
1132         /*
1133          *      Push down the X.25 header
1134          */
1135         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1136
1137         if (msg->msg_flags & MSG_OOB) {
1138                 if (x25->neighbour->extended) {
1139                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1140                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1141                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1142                         *asmptr++ = X25_INTERRUPT;
1143                 } else {
1144                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1145                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1146                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1147                         *asmptr++ = X25_INTERRUPT;
1148                 }
1149         } else {
1150                 if (x25->neighbour->extended) {
1151                         /* Build an Extended X.25 header */
1152                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1153                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1154                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1155                         *asmptr++ = X25_DATA;
1156                         *asmptr++ = X25_DATA;
1157                 } else {
1158                         /* Build an Standard X.25 header */
1159                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1160                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1161                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1162                         *asmptr++ = X25_DATA;
1163                 }
1164
1165                 if (qbit)
1166                         skb->data[0] |= X25_Q_BIT;
1167         }
1168
1169         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1170         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1171
1172         rc = -ENOTCONN;
1173         if (sk->sk_state != TCP_ESTABLISHED)
1174                 goto out_kfree_skb;
1175
1176         if (msg->msg_flags & MSG_OOB)
1177                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1178         else {
1179                 rc = x25_output(sk, skb);
1180                 len = rc;
1181                 if (rc < 0)
1182                         kfree_skb(skb);
1183                 else if (x25->qbitincl)
1184                         len++;
1185         }
1186
1187         /*
1188          * lock_sock() is currently only used to serialize this x25_kick()
1189          * against input-driven x25_kick() calls. It currently only blocks
1190          * incoming packets for this socket and does not protect against
1191          * any other socket state changes and is not called from anywhere
1192          * else. As x25_kick() cannot block and as long as all socket
1193          * operations are BKL-wrapped, we don't need take to care about
1194          * purging the backlog queue in x25_release().
1195          *
1196          * Using lock_sock() to protect all socket operations entirely
1197          * (and making the whole x25 stack SMP aware) unfortunately would
1198          * require major changes to {send,recv}msg and skb allocation methods.
1199          * -> 2.5 ;)
1200          */
1201         lock_sock(sk);
1202         x25_kick(sk);
1203         release_sock(sk);
1204         rc = len;
1205 out:
1206         unlock_kernel();
1207         return rc;
1208 out_kfree_skb:
1209         kfree_skb(skb);
1210         goto out;
1211 }
1212
1213
1214 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1215                        struct msghdr *msg, size_t size,
1216                        int flags)
1217 {
1218         struct sock *sk = sock->sk;
1219         struct x25_sock *x25 = x25_sk(sk);
1220         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1221         size_t copied;
1222         int qbit;
1223         struct sk_buff *skb;
1224         unsigned char *asmptr;
1225         int rc = -ENOTCONN;
1226
1227         lock_kernel();
1228         /*
1229          * This works for seqpacket too. The receiver has ordered the queue for
1230          * us! We do one quick check first though
1231          */
1232         if (sk->sk_state != TCP_ESTABLISHED)
1233                 goto out;
1234
1235         if (flags & MSG_OOB) {
1236                 rc = -EINVAL;
1237                 if (sock_flag(sk, SOCK_URGINLINE) ||
1238                     !skb_peek(&x25->interrupt_in_queue))
1239                         goto out;
1240
1241                 skb = skb_dequeue(&x25->interrupt_in_queue);
1242
1243                 skb_pull(skb, X25_STD_MIN_LEN);
1244
1245                 /*
1246                  *      No Q bit information on Interrupt data.
1247                  */
1248                 if (x25->qbitincl) {
1249                         asmptr  = skb_push(skb, 1);
1250                         *asmptr = 0x00;
1251                 }
1252
1253                 msg->msg_flags |= MSG_OOB;
1254         } else {
1255                 /* Now we can treat all alike */
1256                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1257                                         flags & MSG_DONTWAIT, &rc);
1258                 if (!skb)
1259                         goto out;
1260
1261                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1262
1263                 skb_pull(skb, x25->neighbour->extended ?
1264                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1265
1266                 if (x25->qbitincl) {
1267                         asmptr  = skb_push(skb, 1);
1268                         *asmptr = qbit;
1269                 }
1270         }
1271
1272         skb_reset_transport_header(skb);
1273         copied = skb->len;
1274
1275         if (copied > size) {
1276                 copied = size;
1277                 msg->msg_flags |= MSG_TRUNC;
1278         }
1279
1280         /* Currently, each datagram always contains a complete record */
1281         msg->msg_flags |= MSG_EOR;
1282
1283         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1284         if (rc)
1285                 goto out_free_dgram;
1286
1287         if (sx25) {
1288                 sx25->sx25_family = AF_X25;
1289                 sx25->sx25_addr   = x25->dest_addr;
1290         }
1291
1292         msg->msg_namelen = sizeof(struct sockaddr_x25);
1293
1294         lock_sock(sk);
1295         x25_check_rbuf(sk);
1296         release_sock(sk);
1297         rc = copied;
1298 out_free_dgram:
1299         skb_free_datagram(sk, skb);
1300 out:
1301         unlock_kernel();
1302         return rc;
1303 }
1304
1305
1306 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1307 {
1308         struct sock *sk = sock->sk;
1309         struct x25_sock *x25 = x25_sk(sk);
1310         void __user *argp = (void __user *)arg;
1311         int rc;
1312
1313         lock_kernel();
1314         switch (cmd) {
1315                 case TIOCOUTQ: {
1316                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1317
1318                         if (amount < 0)
1319                                 amount = 0;
1320                         rc = put_user(amount, (unsigned int __user *)argp);
1321                         break;
1322                 }
1323
1324                 case TIOCINQ: {
1325                         struct sk_buff *skb;
1326                         int amount = 0;
1327                         /*
1328                          * These two are safe on a single CPU system as
1329                          * only user tasks fiddle here
1330                          */
1331                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1332                                 amount = skb->len;
1333                         rc = put_user(amount, (unsigned int __user *)argp);
1334                         break;
1335                 }
1336
1337                 case SIOCGSTAMP:
1338                         rc = -EINVAL;
1339                         if (sk)
1340                                 rc = sock_get_timestamp(sk,
1341                                                 (struct timeval __user *)argp);
1342                         break;
1343                 case SIOCGSTAMPNS:
1344                         rc = -EINVAL;
1345                         if (sk)
1346                                 rc = sock_get_timestampns(sk,
1347                                                 (struct timespec __user *)argp);
1348                         break;
1349                 case SIOCGIFADDR:
1350                 case SIOCSIFADDR:
1351                 case SIOCGIFDSTADDR:
1352                 case SIOCSIFDSTADDR:
1353                 case SIOCGIFBRDADDR:
1354                 case SIOCSIFBRDADDR:
1355                 case SIOCGIFNETMASK:
1356                 case SIOCSIFNETMASK:
1357                 case SIOCGIFMETRIC:
1358                 case SIOCSIFMETRIC:
1359                         rc = -EINVAL;
1360                         break;
1361                 case SIOCADDRT:
1362                 case SIOCDELRT:
1363                         rc = -EPERM;
1364                         if (!capable(CAP_NET_ADMIN))
1365                                 break;
1366                         rc = x25_route_ioctl(cmd, argp);
1367                         break;
1368                 case SIOCX25GSUBSCRIP:
1369                         rc = x25_subscr_ioctl(cmd, argp);
1370                         break;
1371                 case SIOCX25SSUBSCRIP:
1372                         rc = -EPERM;
1373                         if (!capable(CAP_NET_ADMIN))
1374                                 break;
1375                         rc = x25_subscr_ioctl(cmd, argp);
1376                         break;
1377                 case SIOCX25GFACILITIES: {
1378                         struct x25_facilities fac = x25->facilities;
1379                         rc = copy_to_user(argp, &fac,
1380                                           sizeof(fac)) ? -EFAULT : 0;
1381                         break;
1382                 }
1383
1384                 case SIOCX25SFACILITIES: {
1385                         struct x25_facilities facilities;
1386                         rc = -EFAULT;
1387                         if (copy_from_user(&facilities, argp,
1388                                            sizeof(facilities)))
1389                                 break;
1390                         rc = -EINVAL;
1391                         if (sk->sk_state != TCP_LISTEN &&
1392                             sk->sk_state != TCP_CLOSE)
1393                                 break;
1394                         if (facilities.pacsize_in < X25_PS16 ||
1395                             facilities.pacsize_in > X25_PS4096)
1396                                 break;
1397                         if (facilities.pacsize_out < X25_PS16 ||
1398                             facilities.pacsize_out > X25_PS4096)
1399                                 break;
1400                         if (facilities.winsize_in < 1 ||
1401                             facilities.winsize_in > 127)
1402                                 break;
1403                         if (facilities.throughput < 0x03 ||
1404                             facilities.throughput > 0xDD)
1405                                 break;
1406                         if (facilities.reverse &&
1407                                 (facilities.reverse & 0x81) != 0x81)
1408                                 break;
1409                         x25->facilities = facilities;
1410                         rc = 0;
1411                         break;
1412                 }
1413
1414                 case SIOCX25GDTEFACILITIES: {
1415                         rc = copy_to_user(argp, &x25->dte_facilities,
1416                                                 sizeof(x25->dte_facilities));
1417                         if (rc)
1418                                 rc = -EFAULT;
1419                         break;
1420                 }
1421
1422                 case SIOCX25SDTEFACILITIES: {
1423                         struct x25_dte_facilities dtefacs;
1424                         rc = -EFAULT;
1425                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1426                                 break;
1427                         rc = -EINVAL;
1428                         if (sk->sk_state != TCP_LISTEN &&
1429                                         sk->sk_state != TCP_CLOSE)
1430                                 break;
1431                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1432                                 break;
1433                         if (dtefacs.calling_ae == NULL)
1434                                 break;
1435                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1436                                 break;
1437                         if (dtefacs.called_ae == NULL)
1438                                 break;
1439                         x25->dte_facilities = dtefacs;
1440                         rc = 0;
1441                         break;
1442                 }
1443
1444                 case SIOCX25GCALLUSERDATA: {
1445                         struct x25_calluserdata cud = x25->calluserdata;
1446                         rc = copy_to_user(argp, &cud,
1447                                           sizeof(cud)) ? -EFAULT : 0;
1448                         break;
1449                 }
1450
1451                 case SIOCX25SCALLUSERDATA: {
1452                         struct x25_calluserdata calluserdata;
1453
1454                         rc = -EFAULT;
1455                         if (copy_from_user(&calluserdata, argp,
1456                                            sizeof(calluserdata)))
1457                                 break;
1458                         rc = -EINVAL;
1459                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1460                                 break;
1461                         x25->calluserdata = calluserdata;
1462                         rc = 0;
1463                         break;
1464                 }
1465
1466                 case SIOCX25GCAUSEDIAG: {
1467                         struct x25_causediag causediag;
1468                         causediag = x25->causediag;
1469                         rc = copy_to_user(argp, &causediag,
1470                                           sizeof(causediag)) ? -EFAULT : 0;
1471                         break;
1472                 }
1473
1474                 case SIOCX25SCAUSEDIAG: {
1475                         struct x25_causediag causediag;
1476                         rc = -EFAULT;
1477                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1478                                 break;
1479                         x25->causediag = causediag;
1480                         rc = 0;
1481                         break;
1482
1483                 }
1484
1485                 case SIOCX25SCUDMATCHLEN: {
1486                         struct x25_subaddr sub_addr;
1487                         rc = -EINVAL;
1488                         if(sk->sk_state != TCP_CLOSE)
1489                                 break;
1490                         rc = -EFAULT;
1491                         if (copy_from_user(&sub_addr, argp,
1492                                         sizeof(sub_addr)))
1493                                 break;
1494                         rc = -EINVAL;
1495                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1496                                 break;
1497                         x25->cudmatchlength = sub_addr.cudmatchlength;
1498                         rc = 0;
1499                         break;
1500                 }
1501
1502                 case SIOCX25CALLACCPTAPPRV: {
1503                         rc = -EINVAL;
1504                         if (sk->sk_state != TCP_CLOSE)
1505                                 break;
1506                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1507                         rc = 0;
1508                         break;
1509                 }
1510
1511                 case SIOCX25SENDCALLACCPT:  {
1512                         rc = -EINVAL;
1513                         if (sk->sk_state != TCP_ESTABLISHED)
1514                                 break;
1515                         if (x25->accptapprv)    /* must call accptapprv above */
1516                                 break;
1517                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1518                         x25->state = X25_STATE_3;
1519                         rc = 0;
1520                         break;
1521                 }
1522
1523                 default:
1524                         rc = -ENOIOCTLCMD;
1525                         break;
1526         }
1527         unlock_kernel();
1528
1529         return rc;
1530 }
1531
1532 static const struct net_proto_family x25_family_ops = {
1533         .family =       AF_X25,
1534         .create =       x25_create,
1535         .owner  =       THIS_MODULE,
1536 };
1537
1538 #ifdef CONFIG_COMPAT
1539 static int compat_x25_subscr_ioctl(unsigned int cmd,
1540                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1541 {
1542         struct compat_x25_subscrip_struct x25_subscr;
1543         struct x25_neigh *nb;
1544         struct net_device *dev;
1545         int rc = -EINVAL;
1546
1547         rc = -EFAULT;
1548         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1549                 goto out;
1550
1551         rc = -EINVAL;
1552         dev = x25_dev_get(x25_subscr.device);
1553         if (dev == NULL)
1554                 goto out;
1555
1556         nb = x25_get_neigh(dev);
1557         if (nb == NULL)
1558                 goto out_dev_put;
1559
1560         dev_put(dev);
1561
1562         if (cmd == SIOCX25GSUBSCRIP) {
1563                 x25_subscr.extended = nb->extended;
1564                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1565                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1566                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1567         } else {
1568                 rc = -EINVAL;
1569                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1570                         rc = 0;
1571                         nb->extended = x25_subscr.extended;
1572                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1573                 }
1574         }
1575         x25_neigh_put(nb);
1576 out:
1577         return rc;
1578 out_dev_put:
1579         dev_put(dev);
1580         goto out;
1581 }
1582
1583 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1584                                 unsigned long arg)
1585 {
1586         void __user *argp = compat_ptr(arg);
1587         struct sock *sk = sock->sk;
1588
1589         int rc = -ENOIOCTLCMD;
1590
1591         switch(cmd) {
1592         case TIOCOUTQ:
1593         case TIOCINQ:
1594                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1595                 break;
1596         case SIOCGSTAMP:
1597                 rc = -EINVAL;
1598                 lock_kernel();
1599                 if (sk)
1600                         rc = compat_sock_get_timestamp(sk,
1601                                         (struct timeval __user*)argp);
1602                 unlock_kernel();
1603                 break;
1604         case SIOCGSTAMPNS:
1605                 rc = -EINVAL;
1606                 lock_kernel();
1607                 if (sk)
1608                         rc = compat_sock_get_timestampns(sk,
1609                                         (struct timespec __user*)argp);
1610                 unlock_kernel();
1611                 break;
1612         case SIOCGIFADDR:
1613         case SIOCSIFADDR:
1614         case SIOCGIFDSTADDR:
1615         case SIOCSIFDSTADDR:
1616         case SIOCGIFBRDADDR:
1617         case SIOCSIFBRDADDR:
1618         case SIOCGIFNETMASK:
1619         case SIOCSIFNETMASK:
1620         case SIOCGIFMETRIC:
1621         case SIOCSIFMETRIC:
1622                 rc = -EINVAL;
1623                 break;
1624         case SIOCADDRT:
1625         case SIOCDELRT:
1626                 rc = -EPERM;
1627                 if (!capable(CAP_NET_ADMIN))
1628                         break;
1629                 lock_kernel();
1630                 rc = x25_route_ioctl(cmd, argp);
1631                 unlock_kernel();
1632                 break;
1633         case SIOCX25GSUBSCRIP:
1634                 lock_kernel();
1635                 rc = compat_x25_subscr_ioctl(cmd, argp);
1636                 unlock_kernel();
1637                 break;
1638         case SIOCX25SSUBSCRIP:
1639                 rc = -EPERM;
1640                 if (!capable(CAP_NET_ADMIN))
1641                         break;
1642                 lock_kernel();
1643                 rc = compat_x25_subscr_ioctl(cmd, argp);
1644                 unlock_kernel();
1645                 break;
1646         case SIOCX25GFACILITIES:
1647         case SIOCX25SFACILITIES:
1648         case SIOCX25GDTEFACILITIES:
1649         case SIOCX25SDTEFACILITIES:
1650         case SIOCX25GCALLUSERDATA:
1651         case SIOCX25SCALLUSERDATA:
1652         case SIOCX25GCAUSEDIAG:
1653         case SIOCX25SCAUSEDIAG:
1654         case SIOCX25SCUDMATCHLEN:
1655         case SIOCX25CALLACCPTAPPRV:
1656         case SIOCX25SENDCALLACCPT:
1657                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1658                 break;
1659         default:
1660                 rc = -ENOIOCTLCMD;
1661                 break;
1662         }
1663         return rc;
1664 }
1665 #endif
1666
1667 static const struct proto_ops x25_proto_ops = {
1668         .family =       AF_X25,
1669         .owner =        THIS_MODULE,
1670         .release =      x25_release,
1671         .bind =         x25_bind,
1672         .connect =      x25_connect,
1673         .socketpair =   sock_no_socketpair,
1674         .accept =       x25_accept,
1675         .getname =      x25_getname,
1676         .poll =         x25_datagram_poll,
1677         .ioctl =        x25_ioctl,
1678 #ifdef CONFIG_COMPAT
1679         .compat_ioctl = compat_x25_ioctl,
1680 #endif
1681         .listen =       x25_listen,
1682         .shutdown =     sock_no_shutdown,
1683         .setsockopt =   x25_setsockopt,
1684         .getsockopt =   x25_getsockopt,
1685         .sendmsg =      x25_sendmsg,
1686         .recvmsg =      x25_recvmsg,
1687         .mmap =         sock_no_mmap,
1688         .sendpage =     sock_no_sendpage,
1689 };
1690
1691 static struct packet_type x25_packet_type __read_mostly = {
1692         .type = cpu_to_be16(ETH_P_X25),
1693         .func = x25_lapb_receive_frame,
1694 };
1695
1696 static struct notifier_block x25_dev_notifier = {
1697         .notifier_call = x25_device_event,
1698 };
1699
1700 void x25_kill_by_neigh(struct x25_neigh *nb)
1701 {
1702         struct sock *s;
1703         struct hlist_node *node;
1704
1705         write_lock_bh(&x25_list_lock);
1706
1707         sk_for_each(s, node, &x25_list)
1708                 if (x25_sk(s)->neighbour == nb)
1709                         x25_disconnect(s, ENETUNREACH, 0, 0);
1710
1711         write_unlock_bh(&x25_list_lock);
1712
1713         /* Remove any related forwards */
1714         x25_clear_forward_by_dev(nb->dev);
1715 }
1716
1717 static int __init x25_init(void)
1718 {
1719         int rc = proto_register(&x25_proto, 0);
1720
1721         if (rc != 0)
1722                 goto out;
1723
1724         rc = sock_register(&x25_family_ops);
1725         if (rc != 0)
1726                 goto out_proto;
1727
1728         dev_add_pack(&x25_packet_type);
1729
1730         rc = register_netdevice_notifier(&x25_dev_notifier);
1731         if (rc != 0)
1732                 goto out_sock;
1733
1734         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1735
1736         x25_register_sysctl();
1737         rc = x25_proc_init();
1738         if (rc != 0)
1739                 goto out_dev;
1740 out:
1741         return rc;
1742 out_dev:
1743         unregister_netdevice_notifier(&x25_dev_notifier);
1744 out_sock:
1745         sock_unregister(AF_X25);
1746 out_proto:
1747         proto_unregister(&x25_proto);
1748         goto out;
1749 }
1750 module_init(x25_init);
1751
1752 static void __exit x25_exit(void)
1753 {
1754         x25_proc_exit();
1755         x25_link_free();
1756         x25_route_free();
1757
1758         x25_unregister_sysctl();
1759
1760         unregister_netdevice_notifier(&x25_dev_notifier);
1761
1762         dev_remove_pack(&x25_packet_type);
1763
1764         sock_unregister(AF_X25);
1765         proto_unregister(&x25_proto);
1766 }
1767 module_exit(x25_exit);
1768
1769 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1770 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1771 MODULE_LICENSE("GPL");
1772 MODULE_ALIAS_NETPROTO(PF_X25);