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/timer.h>
  44 #include <linux/string.h>
  45 #include <linux/net.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <net/sock.h>
  50 #include <net/tcp_states.h>
  51 #include <asm/uaccess.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  54 #include <linux/notifier.h>
  55 #include <linux/init.h>
  56 #include <linux/compat.h>
  57
  58 #include <net/x25.h>
  59 #include <net/compat.h>
  60
  61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  62 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  63 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  64 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  65 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  66 int sysctl_x25_forward                 = 0;
  67
  68 HLIST_HEAD(x25_list);
  69 DEFINE_RWLOCK(x25_list_lock);
  70
  71 static const struct proto_ops x25_proto_ops;
  72
  73 static struct x25_address null_x25_address = {"               "};
  74
  75 #ifdef CONFIG_COMPAT
  76 struct compat_x25_subscrip_struct {
  77         char device[200-sizeof(compat_ulong_t)];
  78         compat_ulong_t global_facil_mask;
  79         compat_uint_t extended;
  80 };
  81 #endif
  82
  83 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  84                   struct x25_address *calling_addr)
  85 {
  86         int called_len, calling_len;
  87         char *called, *calling;
  88         int i;
  89
  90         called_len  = (*p >> 0) & 0x0F;
  91         calling_len = (*p >> 4) & 0x0F;
  92
  93         called  = called_addr->x25_addr;
  94         calling = calling_addr->x25_addr;
  95         p++;
  96
  97         for (i = 0; i < (called_len + calling_len); i++) {
  98                 if (i < called_len) {
  99                         if (i % 2 != 0) {
 100                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 101                                 p++;
 102                         } else {
 103                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 104                         }
 105                 } else {
 106                         if (i % 2 != 0) {
 107                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 108                                 p++;
 109                         } else {
 110                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 111                         }
 112                 }
 113         }
 114
 115         *called = *calling = '\0';
 116
 117         return 1 + (called_len + calling_len + 1) / 2;
 118 }
 119
 120 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 121                   struct x25_address *calling_addr)
 122 {
 123         unsigned int called_len, calling_len;
 124         char *called, *calling;
 125         int i;
 126
 127         called  = called_addr->x25_addr;
 128         calling = calling_addr->x25_addr;
 129
 130         called_len  = strlen(called);
 131         calling_len = strlen(calling);
 132
 133         *p++ = (calling_len << 4) | (called_len << 0);
 134
 135         for (i = 0; i < (called_len + calling_len); i++) {
 136                 if (i < called_len) {
 137                         if (i % 2 != 0) {
 138                                 *p |= (*called++ - '0') << 0;
 139                                 p++;
 140                         } else {
 141                                 *p = 0x00;
 142                                 *p |= (*called++ - '0') << 4;
 143                         }
 144                 } else {
 145                         if (i % 2 != 0) {
 146                                 *p |= (*calling++ - '0') << 0;
 147                                 p++;
 148                         } else {
 149                                 *p = 0x00;
 150                                 *p |= (*calling++ - '0') << 4;
 151                         }
 152                 }
 153         }
 154
 155         return 1 + (called_len + calling_len + 1) / 2;
 156 }
 157
 158 /*
 159  *      Socket removal during an interrupt is now safe.
 160  */
 161 static void x25_remove_socket(struct sock *sk)
 162 {
 163         write_lock_bh(&x25_list_lock);
 164         sk_del_node_init(sk);
 165         write_unlock_bh(&x25_list_lock);
 166 }
 167
 168 /*
 169  *      Kill all bound sockets on a dropped device.
 170  */
 171 static void x25_kill_by_device(struct net_device *dev)
 172 {
 173         struct sock *s;
 174         struct hlist_node *node;
 175
 176         write_lock_bh(&x25_list_lock);
 177
 178         sk_for_each(s, node, &x25_list)
 179                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 180                         x25_disconnect(s, ENETUNREACH, 0, 0);
 181
 182         write_unlock_bh(&x25_list_lock);
 183 }
 184
 185 /*
 186  *      Handle device status changes.
 187  */
 188 static int x25_device_event(struct notifier_block *this, unsigned long event,
 189                             void *ptr)
 190 {
 191         struct net_device *dev = ptr;
 192         struct x25_neigh *nb;
 193
 194         if (dev->type == ARPHRD_X25
 195 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 196          || dev->type == ARPHRD_ETHER
 197 #endif
 198          ) {
 199                 switch (event) {
 200                         case NETDEV_UP:
 201                                 x25_link_device_up(dev);
 202                                 break;
 203                         case NETDEV_GOING_DOWN:
 204                                 nb = x25_get_neigh(dev);
 205                                 if (nb) {
 206                                         x25_terminate_link(nb);
 207                                         x25_neigh_put(nb);
 208                                 }
 209                                 break;
 210                         case NETDEV_DOWN:
 211                                 x25_kill_by_device(dev);
 212                                 x25_route_device_down(dev);
 213                                 x25_link_device_down(dev);
 214                                 break;
 215                 }
 216         }
 217
 218         return NOTIFY_DONE;
 219 }
 220
 221 /*
 222  *      Add a socket to the bound sockets list.
 223  */
 224 static void x25_insert_socket(struct sock *sk)
 225 {
 226         write_lock_bh(&x25_list_lock);
 227         sk_add_node(sk, &x25_list);
 228         write_unlock_bh(&x25_list_lock);
 229 }
 230
 231 /*
 232  *      Find a socket that wants to accept the Call Request we just
 233  *      received. Check the full list for an address/cud match.
 234  *      If no cuds match return the next_best thing, an address match.
 235  *      Note: if a listening socket has cud set it must only get calls
 236  *      with matching cud.
 237  */
 238 static struct sock *x25_find_listener(struct x25_address *addr,
 239                                         struct sk_buff *skb)
 240 {
 241         struct sock *s;
 242         struct sock *next_best;
 243         struct hlist_node *node;
 244
 245         read_lock_bh(&x25_list_lock);
 246         next_best = NULL;
 247
 248         sk_for_each(s, node, &x25_list)
 249                 if ((!strcmp(addr->x25_addr,
 250                         x25_sk(s)->source_addr.x25_addr) ||
 251                                 !strcmp(addr->x25_addr,
 252                                         null_x25_address.x25_addr)) &&
 253                                         s->sk_state == TCP_LISTEN) {
 254                         /*
 255                          * Found a listening socket, now check the incoming
 256                          * call user data vs this sockets call user data
 257                          */
 258                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 259                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 260                                         skb->data,
 261                                         x25_sk(s)->cudmatchlength)) == 0) {
 262                                         sock_hold(s);
 263                                         goto found;
 264                                  }
 265                         } else
 266                                 next_best = s;
 267                 }
 268         if (next_best) {
 269                 s = next_best;
 270                 sock_hold(s);
 271                 goto found;
 272         }
 273         s = NULL;
 274 found:
 275         read_unlock_bh(&x25_list_lock);
 276         return s;
 277 }
 278
 279 /*
 280  *      Find a connected X.25 socket given my LCI and neighbour.
 281  */
 282 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 283 {
 284         struct sock *s;
 285         struct hlist_node *node;
 286
 287         sk_for_each(s, node, &x25_list)
 288                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 289                         sock_hold(s);
 290                         goto found;
 291                 }
 292         s = NULL;
 293 found:
 294         return s;
 295 }
 296
 297 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 298 {
 299         struct sock *s;
 300
 301         read_lock_bh(&x25_list_lock);
 302         s = __x25_find_socket(lci, nb);
 303         read_unlock_bh(&x25_list_lock);
 304         return s;
 305 }
 306
 307 /*
 308  *      Find a unique LCI for a given device.
 309  */
 310 static unsigned int x25_new_lci(struct x25_neigh *nb)
 311 {
 312         unsigned int lci = 1;
 313         struct sock *sk;
 314
 315         read_lock_bh(&x25_list_lock);
 316
 317         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 318                 sock_put(sk);
 319                 if (++lci == 4096) {
 320                         lci = 0;
 321                         break;
 322                 }
 323         }
 324
 325         read_unlock_bh(&x25_list_lock);
 326         return lci;
 327 }
 328
 329 /*
 330  *      Deferred destroy.
 331  */
 332 void x25_destroy_socket(struct sock *);
 333
 334 /*
 335  *      handler for deferred kills.
 336  */
 337 static void x25_destroy_timer(unsigned long data)
 338 {
 339         x25_destroy_socket((struct sock *)data);
 340 }
 341
 342 /*
 343  *      This is called from user mode and the timers. Thus it protects itself
 344  *      against interrupt users but doesn't worry about being called during
 345  *      work. Once it is removed from the queue no interrupt or bottom half
 346  *      will touch it and we are (fairly 8-) ) safe.
 347  *      Not static as it's used by the timer
 348  */
 349 void x25_destroy_socket(struct sock *sk)
 350 {
 351         struct sk_buff *skb;
 352
 353         sock_hold(sk);
 354         lock_sock(sk);
 355         x25_stop_heartbeat(sk);
 356         x25_stop_timer(sk);
 357
 358         x25_remove_socket(sk);
 359         x25_clear_queues(sk);           /* Flush the queues */
 360
 361         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 362                 if (skb->sk != sk) {            /* A pending connection */
 363                         /*
 364                          * Queue the unaccepted socket for death
 365                          */
 366                         sock_set_flag(skb->sk, SOCK_DEAD);
 367                         x25_start_heartbeat(skb->sk);
 368                         x25_sk(skb->sk)->state = X25_STATE_0;
 369                 }
 370
 371                 kfree_skb(skb);
 372         }
 373
 374         if (atomic_read(&sk->sk_wmem_alloc) ||
 375             atomic_read(&sk->sk_rmem_alloc)) {
 376                 /* Defer: outstanding buffers */
 377                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 378                 sk->sk_timer.function = x25_destroy_timer;
 379                 sk->sk_timer.data = (unsigned long)sk;
 380                 add_timer(&sk->sk_timer);
 381         } else {
 382                 /* drop last reference so sock_put will free */
 383                 __sock_put(sk);
 384         }
 385
 386         release_sock(sk);
 387         sock_put(sk);
 388 }
 389
 390 /*
 391  *      Handling for system calls applied via the various interfaces to a
 392  *      X.25 socket object.
 393  */
 394
 395 static int x25_setsockopt(struct socket *sock, int level, int optname,
 396                           char __user *optval, int optlen)
 397 {
 398         int opt;
 399         struct sock *sk = sock->sk;
 400         int rc = -ENOPROTOOPT;
 401
 402         if (level != SOL_X25 || optname != X25_QBITINCL)
 403                 goto out;
 404
 405         rc = -EINVAL;
 406         if (optlen < sizeof(int))
 407                 goto out;
 408
 409         rc = -EFAULT;
 410         if (get_user(opt, (int __user *)optval))
 411                 goto out;
 412
 413         x25_sk(sk)->qbitincl = !!opt;
 414         rc = 0;
 415 out:
 416         return rc;
 417 }
 418
 419 static int x25_getsockopt(struct socket *sock, int level, int optname,
 420                           char __user *optval, int __user *optlen)
 421 {
 422         struct sock *sk = sock->sk;
 423         int val, len, rc = -ENOPROTOOPT;
 424
 425         if (level != SOL_X25 || optname != X25_QBITINCL)
 426                 goto out;
 427
 428         rc = -EFAULT;
 429         if (get_user(len, optlen))
 430                 goto out;
 431
 432         len = min_t(unsigned int, len, sizeof(int));
 433
 434         rc = -EINVAL;
 435         if (len < 0)
 436                 goto out;
 437
 438         rc = -EFAULT;
 439         if (put_user(len, optlen))
 440                 goto out;
 441
 442         val = x25_sk(sk)->qbitincl;
 443         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 444 out:
 445         return rc;
 446 }
 447
 448 static int x25_listen(struct socket *sock, int backlog)
 449 {
 450         struct sock *sk = sock->sk;
 451         int rc = -EOPNOTSUPP;
 452
 453         if (sk->sk_state != TCP_LISTEN) {
 454                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 455                 sk->sk_max_ack_backlog = backlog;
 456                 sk->sk_state           = TCP_LISTEN;
 457                 rc = 0;
 458         }
 459
 460         return rc;
 461 }
 462
 463 static struct proto x25_proto = {
 464         .name     = "X25",
 465         .owner    = THIS_MODULE,
 466         .obj_size = sizeof(struct x25_sock),
 467 };
 468
 469 static struct sock *x25_alloc_socket(struct net *net)
 470 {
 471         struct x25_sock *x25;
 472         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, 1);
 473
 474         if (!sk)
 475                 goto out;
 476
 477         sock_init_data(NULL, sk);
 478
 479         x25 = x25_sk(sk);
 480         skb_queue_head_init(&x25->ack_queue);
 481         skb_queue_head_init(&x25->fragment_queue);
 482         skb_queue_head_init(&x25->interrupt_in_queue);
 483         skb_queue_head_init(&x25->interrupt_out_queue);
 484 out:
 485         return sk;
 486 }
 487
 488 static int x25_create(struct net *net, struct socket *sock, int protocol)
 489 {
 490         struct sock *sk;
 491         struct x25_sock *x25;
 492         int rc = -ESOCKTNOSUPPORT;
 493
 494         if (net != &init_net)
 495                 return -EAFNOSUPPORT;
 496
 497         if (sock->type != SOCK_SEQPACKET || protocol)
 498                 goto out;
 499
 500         rc = -ENOMEM;
 501         if ((sk = x25_alloc_socket(net)) == NULL)
 502                 goto out;
 503
 504         x25 = x25_sk(sk);
 505
 506         sock_init_data(sock, sk);
 507
 508         x25_init_timers(sk);
 509
 510         sock->ops    = &x25_proto_ops;
 511         sk->sk_protocol = protocol;
 512         sk->sk_backlog_rcv = x25_backlog_rcv;
 513
 514         x25->t21   = sysctl_x25_call_request_timeout;
 515         x25->t22   = sysctl_x25_reset_request_timeout;
 516         x25->t23   = sysctl_x25_clear_request_timeout;
 517         x25->t2    = sysctl_x25_ack_holdback_timeout;
 518         x25->state = X25_STATE_0;
 519         x25->cudmatchlength = 0;
 520         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 521                                                         /* on call accept   */
 522
 523         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 524         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 525         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 526         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 527         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 528         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 529         x25->dte_facilities.calling_len = 0;
 530         x25->dte_facilities.called_len = 0;
 531         memset(x25->dte_facilities.called_ae, '\0',
 532                         sizeof(x25->dte_facilities.called_ae));
 533         memset(x25->dte_facilities.calling_ae, '\0',
 534                         sizeof(x25->dte_facilities.calling_ae));
 535
 536         rc = 0;
 537 out:
 538         return rc;
 539 }
 540
 541 static struct sock *x25_make_new(struct sock *osk)
 542 {
 543         struct sock *sk = NULL;
 544         struct x25_sock *x25, *ox25;
 545
 546         if (osk->sk_type != SOCK_SEQPACKET)
 547                 goto out;
 548
 549         if ((sk = x25_alloc_socket(osk->sk_net)) == NULL)
 550                 goto out;
 551
 552         x25 = x25_sk(sk);
 553
 554         sk->sk_type        = osk->sk_type;
 555         sk->sk_socket      = osk->sk_socket;
 556         sk->sk_priority    = osk->sk_priority;
 557         sk->sk_protocol    = osk->sk_protocol;
 558         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 559         sk->sk_sndbuf      = osk->sk_sndbuf;
 560         sk->sk_state       = TCP_ESTABLISHED;
 561         sk->sk_sleep       = osk->sk_sleep;
 562         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 563         sock_copy_flags(sk, osk);
 564
 565         ox25 = x25_sk(osk);
 566         x25->t21        = ox25->t21;
 567         x25->t22        = ox25->t22;
 568         x25->t23        = ox25->t23;
 569         x25->t2         = ox25->t2;
 570         x25->facilities = ox25->facilities;
 571         x25->qbitincl   = ox25->qbitincl;
 572         x25->dte_facilities = ox25->dte_facilities;
 573         x25->cudmatchlength = ox25->cudmatchlength;
 574         x25->accptapprv = ox25->accptapprv;
 575
 576         x25_init_timers(sk);
 577 out:
 578         return sk;
 579 }
 580
 581 static int x25_release(struct socket *sock)
 582 {
 583         struct sock *sk = sock->sk;
 584         struct x25_sock *x25;
 585
 586         if (!sk)
 587                 goto out;
 588
 589         x25 = x25_sk(sk);
 590
 591         switch (x25->state) {
 592
 593                 case X25_STATE_0:
 594                 case X25_STATE_2:
 595                         x25_disconnect(sk, 0, 0, 0);
 596                         x25_destroy_socket(sk);
 597                         goto out;
 598
 599                 case X25_STATE_1:
 600                 case X25_STATE_3:
 601                 case X25_STATE_4:
 602                         x25_clear_queues(sk);
 603                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 604                         x25_start_t23timer(sk);
 605                         x25->state = X25_STATE_2;
 606                         sk->sk_state    = TCP_CLOSE;
 607                         sk->sk_shutdown |= SEND_SHUTDOWN;
 608                         sk->sk_state_change(sk);
 609                         sock_set_flag(sk, SOCK_DEAD);
 610                         sock_set_flag(sk, SOCK_DESTROY);
 611                         break;
 612         }
 613
 614         sock->sk        = NULL;
 615         sk->sk_socket   = NULL; /* Not used, but we should do this */
 616 out:
 617         return 0;
 618 }
 619
 620 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 621 {
 622         struct sock *sk = sock->sk;
 623         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 624
 625         if (!sock_flag(sk, SOCK_ZAPPED) ||
 626             addr_len != sizeof(struct sockaddr_x25) ||
 627             addr->sx25_family != AF_X25)
 628                 return -EINVAL;
 629
 630         x25_sk(sk)->source_addr = addr->sx25_addr;
 631         x25_insert_socket(sk);
 632         sock_reset_flag(sk, SOCK_ZAPPED);
 633         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 634
 635         return 0;
 636 }
 637
 638 static int x25_wait_for_connection_establishment(struct sock *sk)
 639 {
 640         DECLARE_WAITQUEUE(wait, current);
 641         int rc;
 642
 643         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 644         for (;;) {
 645                 __set_current_state(TASK_INTERRUPTIBLE);
 646                 rc = -ERESTARTSYS;
 647                 if (signal_pending(current))
 648                         break;
 649                 rc = sock_error(sk);
 650                 if (rc) {
 651                         sk->sk_socket->state = SS_UNCONNECTED;
 652                         break;
 653                 }
 654                 rc = 0;
 655                 if (sk->sk_state != TCP_ESTABLISHED) {
 656                         release_sock(sk);
 657                         schedule();
 658                         lock_sock(sk);
 659                 } else
 660                         break;
 661         }
 662         __set_current_state(TASK_RUNNING);
 663         remove_wait_queue(sk->sk_sleep, &wait);
 664         return rc;
 665 }
 666
 667 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 668                        int addr_len, int flags)
 669 {
 670         struct sock *sk = sock->sk;
 671         struct x25_sock *x25 = x25_sk(sk);
 672         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 673         struct x25_route *rt;
 674         int rc = 0;
 675
 676         lock_sock(sk);
 677         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 678                 sock->state = SS_CONNECTED;
 679                 goto out; /* Connect completed during a ERESTARTSYS event */
 680         }
 681
 682         rc = -ECONNREFUSED;
 683         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 684                 sock->state = SS_UNCONNECTED;
 685                 goto out;
 686         }
 687
 688         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 689         if (sk->sk_state == TCP_ESTABLISHED)
 690                 goto out;
 691
 692         sk->sk_state   = TCP_CLOSE;
 693         sock->state = SS_UNCONNECTED;
 694
 695         rc = -EINVAL;
 696         if (addr_len != sizeof(struct sockaddr_x25) ||
 697             addr->sx25_family != AF_X25)
 698                 goto out;
 699
 700         rc = -ENETUNREACH;
 701         rt = x25_get_route(&addr->sx25_addr);
 702         if (!rt)
 703                 goto out;
 704
 705         x25->neighbour = x25_get_neigh(rt->dev);
 706         if (!x25->neighbour)
 707                 goto out_put_route;
 708
 709         x25_limit_facilities(&x25->facilities, x25->neighbour);
 710
 711         x25->lci = x25_new_lci(x25->neighbour);
 712         if (!x25->lci)
 713                 goto out_put_neigh;
 714
 715         rc = -EINVAL;
 716         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 717                 goto out_put_neigh;
 718
 719         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 720                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 721
 722         x25->dest_addr = addr->sx25_addr;
 723
 724         /* Move to connecting socket, start sending Connect Requests */
 725         sock->state   = SS_CONNECTING;
 726         sk->sk_state  = TCP_SYN_SENT;
 727
 728         x25->state = X25_STATE_1;
 729
 730         x25_write_internal(sk, X25_CALL_REQUEST);
 731
 732         x25_start_heartbeat(sk);
 733         x25_start_t21timer(sk);
 734
 735         /* Now the loop */
 736         rc = -EINPROGRESS;
 737         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 738                 goto out_put_neigh;
 739
 740         rc = x25_wait_for_connection_establishment(sk);
 741         if (rc)
 742                 goto out_put_neigh;
 743
 744         sock->state = SS_CONNECTED;
 745         rc = 0;
 746 out_put_neigh:
 747         if (rc)
 748                 x25_neigh_put(x25->neighbour);
 749 out_put_route:
 750         x25_route_put(rt);
 751 out:
 752         release_sock(sk);
 753         return rc;
 754 }
 755
 756 static int x25_wait_for_data(struct sock *sk, long timeout)
 757 {
 758         DECLARE_WAITQUEUE(wait, current);
 759         int rc = 0;
 760
 761         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 762         for (;;) {
 763                 __set_current_state(TASK_INTERRUPTIBLE);
 764                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 765                         break;
 766                 rc = -ERESTARTSYS;
 767                 if (signal_pending(current))
 768                         break;
 769                 rc = -EAGAIN;
 770                 if (!timeout)
 771                         break;
 772                 rc = 0;
 773                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 774                         release_sock(sk);
 775                         timeout = schedule_timeout(timeout);
 776                         lock_sock(sk);
 777                 } else
 778                         break;
 779         }
 780         __set_current_state(TASK_RUNNING);
 781         remove_wait_queue(sk->sk_sleep, &wait);
 782         return rc;
 783 }
 784
 785 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 786 {
 787         struct sock *sk = sock->sk;
 788         struct sock *newsk;
 789         struct sk_buff *skb;
 790         int rc = -EINVAL;
 791
 792         if (!sk || sk->sk_state != TCP_LISTEN)
 793                 goto out;
 794
 795         rc = -EOPNOTSUPP;
 796         if (sk->sk_type != SOCK_SEQPACKET)
 797                 goto out;
 798
 799         lock_sock(sk);
 800         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 801         if (rc)
 802                 goto out2;
 803         skb = skb_dequeue(&sk->sk_receive_queue);
 804         rc = -EINVAL;
 805         if (!skb->sk)
 806                 goto out2;
 807         newsk            = skb->sk;
 808         newsk->sk_socket = newsock;
 809         newsk->sk_sleep  = &newsock->wait;
 810
 811         /* Now attach up the new socket */
 812         skb->sk = NULL;
 813         kfree_skb(skb);
 814         sk->sk_ack_backlog--;
 815         newsock->sk    = newsk;
 816         newsock->state = SS_CONNECTED;
 817         rc = 0;
 818 out2:
 819         release_sock(sk);
 820 out:
 821         return rc;
 822 }
 823
 824 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 825                        int *uaddr_len, int peer)
 826 {
 827         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 828         struct sock *sk = sock->sk;
 829         struct x25_sock *x25 = x25_sk(sk);
 830
 831         if (peer) {
 832                 if (sk->sk_state != TCP_ESTABLISHED)
 833                         return -ENOTCONN;
 834                 sx25->sx25_addr = x25->dest_addr;
 835         } else
 836                 sx25->sx25_addr = x25->source_addr;
 837
 838         sx25->sx25_family = AF_X25;
 839         *uaddr_len = sizeof(*sx25);
 840
 841         return 0;
 842 }
 843
 844 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 845                         unsigned int lci)
 846 {
 847         struct sock *sk;
 848         struct sock *make;
 849         struct x25_sock *makex25;
 850         struct x25_address source_addr, dest_addr;
 851         struct x25_facilities facilities;
 852         struct x25_dte_facilities dte_facilities;
 853         int len, addr_len, rc;
 854
 855         /*
 856          *      Remove the LCI and frame type.
 857          */
 858         skb_pull(skb, X25_STD_MIN_LEN);
 859
 860         /*
 861          *      Extract the X.25 addresses and convert them to ASCII strings,
 862          *      and remove them.
 863          */
 864         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 865         skb_pull(skb, addr_len);
 866
 867         /*
 868          *      Get the length of the facilities, skip past them for the moment
 869          *      get the call user data because this is needed to determine
 870          *      the correct listener
 871          */
 872         len = skb->data[0] + 1;
 873         skb_pull(skb,len);
 874
 875         /*
 876          *      Find a listener for the particular address/cud pair.
 877          */
 878         sk = x25_find_listener(&source_addr,skb);
 879         skb_push(skb,len);
 880
 881         if (sk != NULL && sk_acceptq_is_full(sk)) {
 882                 goto out_sock_put;
 883         }
 884
 885         /*
 886          *      We dont have any listeners for this incoming call.
 887          *      Try forwarding it.
 888          */
 889         if (sk == NULL) {
 890                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 891                 if (sysctl_x25_forward &&
 892                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 893                 {
 894                         /* Call was forwarded, dont process it any more */
 895                         kfree_skb(skb);
 896                         rc = 1;
 897                         goto out;
 898                 } else {
 899                         /* No listeners, can't forward, clear the call */
 900                         goto out_clear_request;
 901                 }
 902         }
 903
 904         /*
 905          *      Try to reach a compromise on the requested facilities.
 906          */
 907         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 908         if (len == -1)
 909                 goto out_sock_put;
 910
 911         /*
 912          * current neighbour/link might impose additional limits
 913          * on certain facilties
 914          */
 915
 916         x25_limit_facilities(&facilities, nb);
 917
 918         /*
 919          *      Try to create a new socket.
 920          */
 921         make = x25_make_new(sk);
 922         if (!make)
 923                 goto out_sock_put;
 924
 925         /*
 926          *      Remove the facilities
 927          */
 928         skb_pull(skb, len);
 929
 930         skb->sk     = make;
 931         make->sk_state = TCP_ESTABLISHED;
 932
 933         makex25 = x25_sk(make);
 934         makex25->lci           = lci;
 935         makex25->dest_addr     = dest_addr;
 936         makex25->source_addr   = source_addr;
 937         makex25->neighbour     = nb;
 938         makex25->facilities    = facilities;
 939         makex25->dte_facilities= dte_facilities;
 940         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 941         /* ensure no reverse facil on accept */
 942         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 943         /* ensure no calling address extension on accept */
 944         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 945         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 946
 947         /* Normally all calls are accepted immediatly */
 948         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 949                 x25_write_internal(make, X25_CALL_ACCEPTED);
 950                 makex25->state = X25_STATE_3;
 951         }
 952
 953         /*
 954          *      Incoming Call User Data.
 955          */
 956         if (skb->len >= 0) {
 957                 skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
 958                 makex25->calluserdata.cudlength = skb->len;
 959         }
 960
 961         sk->sk_ack_backlog++;
 962
 963         x25_insert_socket(make);
 964
 965         skb_queue_head(&sk->sk_receive_queue, skb);
 966
 967         x25_start_heartbeat(make);
 968
 969         if (!sock_flag(sk, SOCK_DEAD))
 970                 sk->sk_data_ready(sk, skb->len);
 971         rc = 1;
 972         sock_put(sk);
 973 out:
 974         return rc;
 975 out_sock_put:
 976         sock_put(sk);
 977 out_clear_request:
 978         rc = 0;
 979         x25_transmit_clear_request(nb, lci, 0x01);
 980         goto out;
 981 }
 982
 983 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 984                        struct msghdr *msg, size_t len)
 985 {
 986         struct sock *sk = sock->sk;
 987         struct x25_sock *x25 = x25_sk(sk);
 988         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 989         struct sockaddr_x25 sx25;
 990         struct sk_buff *skb;
 991         unsigned char *asmptr;
 992         int noblock = msg->msg_flags & MSG_DONTWAIT;
 993         size_t size;
 994         int qbit = 0, rc = -EINVAL;
 995
 996         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 997                 goto out;
 998
 999         /* we currently don't support segmented records at the user interface */
1000         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1001                 goto out;
1002
1003         rc = -EADDRNOTAVAIL;
1004         if (sock_flag(sk, SOCK_ZAPPED))
1005                 goto out;
1006
1007         rc = -EPIPE;
1008         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1009                 send_sig(SIGPIPE, current, 0);
1010                 goto out;
1011         }
1012
1013         rc = -ENETUNREACH;
1014         if (!x25->neighbour)
1015                 goto out;
1016
1017         if (usx25) {
1018                 rc = -EINVAL;
1019                 if (msg->msg_namelen < sizeof(sx25))
1020                         goto out;
1021                 memcpy(&sx25, usx25, sizeof(sx25));
1022                 rc = -EISCONN;
1023                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1024                         goto out;
1025                 rc = -EINVAL;
1026                 if (sx25.sx25_family != AF_X25)
1027                         goto out;
1028         } else {
1029                 /*
1030                  *      FIXME 1003.1g - if the socket is like this because
1031                  *      it has become closed (not started closed) we ought
1032                  *      to SIGPIPE, EPIPE;
1033                  */
1034                 rc = -ENOTCONN;
1035                 if (sk->sk_state != TCP_ESTABLISHED)
1036                         goto out;
1037
1038                 sx25.sx25_family = AF_X25;
1039                 sx25.sx25_addr   = x25->dest_addr;
1040         }
1041
1042         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1043
1044         /* Build a packet */
1045         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1046
1047         if ((msg->msg_flags & MSG_OOB) && len > 32)
1048                 len = 32;
1049
1050         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1051
1052         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1053         if (!skb)
1054                 goto out;
1055         X25_SKB_CB(skb)->flags = msg->msg_flags;
1056
1057         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1058
1059         /*
1060          *      Put the data on the end
1061          */
1062         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1063
1064         skb_reset_transport_header(skb);
1065         skb_put(skb, len);
1066
1067         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1068         if (rc)
1069                 goto out_kfree_skb;
1070
1071         /*
1072          *      If the Q BIT Include socket option is in force, the first
1073          *      byte of the user data is the logical value of the Q Bit.
1074          */
1075         if (x25->qbitincl) {
1076                 qbit = skb->data[0];
1077                 skb_pull(skb, 1);
1078         }
1079
1080         /*
1081          *      Push down the X.25 header
1082          */
1083         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1084
1085         if (msg->msg_flags & MSG_OOB) {
1086                 if (x25->neighbour->extended) {
1087                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1088                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1089                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1090                         *asmptr++ = X25_INTERRUPT;
1091                 } else {
1092                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1093                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1094                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1095                         *asmptr++ = X25_INTERRUPT;
1096                 }
1097         } else {
1098                 if (x25->neighbour->extended) {
1099                         /* Build an Extended X.25 header */
1100                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1101                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1102                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1103                         *asmptr++ = X25_DATA;
1104                         *asmptr++ = X25_DATA;
1105                 } else {
1106                         /* Build an Standard X.25 header */
1107                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1108                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1109                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1110                         *asmptr++ = X25_DATA;
1111                 }
1112
1113                 if (qbit)
1114                         skb->data[0] |= X25_Q_BIT;
1115         }
1116
1117         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1118         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1119
1120         rc = -ENOTCONN;
1121         if (sk->sk_state != TCP_ESTABLISHED)
1122                 goto out_kfree_skb;
1123
1124         if (msg->msg_flags & MSG_OOB)
1125                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1126         else {
1127                 len = x25_output(sk, skb);
1128                 if (len < 0)
1129                         kfree_skb(skb);
1130                 else if (x25->qbitincl)
1131                         len++;
1132         }
1133
1134         /*
1135          * lock_sock() is currently only used to serialize this x25_kick()
1136          * against input-driven x25_kick() calls. It currently only blocks
1137          * incoming packets for this socket and does not protect against
1138          * any other socket state changes and is not called from anywhere
1139          * else. As x25_kick() cannot block and as long as all socket
1140          * operations are BKL-wrapped, we don't need take to care about
1141          * purging the backlog queue in x25_release().
1142          *
1143          * Using lock_sock() to protect all socket operations entirely
1144          * (and making the whole x25 stack SMP aware) unfortunately would
1145          * require major changes to {send,recv}msg and skb allocation methods.
1146          * -> 2.5 ;)
1147          */
1148         lock_sock(sk);
1149         x25_kick(sk);
1150         release_sock(sk);
1151         rc = len;
1152 out:
1153         return rc;
1154 out_kfree_skb:
1155         kfree_skb(skb);
1156         goto out;
1157 }
1158
1159
1160 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1161                        struct msghdr *msg, size_t size,
1162                        int flags)
1163 {
1164         struct sock *sk = sock->sk;
1165         struct x25_sock *x25 = x25_sk(sk);
1166         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1167         size_t copied;
1168         int qbit;
1169         struct sk_buff *skb;
1170         unsigned char *asmptr;
1171         int rc = -ENOTCONN;
1172
1173         /*
1174          * This works for seqpacket too. The receiver has ordered the queue for
1175          * us! We do one quick check first though
1176          */
1177         if (sk->sk_state != TCP_ESTABLISHED)
1178                 goto out;
1179
1180         if (flags & MSG_OOB) {
1181                 rc = -EINVAL;
1182                 if (sock_flag(sk, SOCK_URGINLINE) ||
1183                     !skb_peek(&x25->interrupt_in_queue))
1184                         goto out;
1185
1186                 skb = skb_dequeue(&x25->interrupt_in_queue);
1187
1188                 skb_pull(skb, X25_STD_MIN_LEN);
1189
1190                 /*
1191                  *      No Q bit information on Interrupt data.
1192                  */
1193                 if (x25->qbitincl) {
1194                         asmptr  = skb_push(skb, 1);
1195                         *asmptr = 0x00;
1196                 }
1197
1198                 msg->msg_flags |= MSG_OOB;
1199         } else {
1200                 /* Now we can treat all alike */
1201                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1202                                         flags & MSG_DONTWAIT, &rc);
1203                 if (!skb)
1204                         goto out;
1205
1206                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1207
1208                 skb_pull(skb, x25->neighbour->extended ?
1209                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1210
1211                 if (x25->qbitincl) {
1212                         asmptr  = skb_push(skb, 1);
1213                         *asmptr = qbit;
1214                 }
1215         }
1216
1217         skb_reset_transport_header(skb);
1218         copied = skb->len;
1219
1220         if (copied > size) {
1221                 copied = size;
1222                 msg->msg_flags |= MSG_TRUNC;
1223         }
1224
1225         /* Currently, each datagram always contains a complete record */
1226         msg->msg_flags |= MSG_EOR;
1227
1228         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1229         if (rc)
1230                 goto out_free_dgram;
1231
1232         if (sx25) {
1233                 sx25->sx25_family = AF_X25;
1234                 sx25->sx25_addr   = x25->dest_addr;
1235         }
1236
1237         msg->msg_namelen = sizeof(struct sockaddr_x25);
1238
1239         lock_sock(sk);
1240         x25_check_rbuf(sk);
1241         release_sock(sk);
1242         rc = copied;
1243 out_free_dgram:
1244         skb_free_datagram(sk, skb);
1245 out:
1246         return rc;
1247 }
1248
1249
1250 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1251 {
1252         struct sock *sk = sock->sk;
1253         struct x25_sock *x25 = x25_sk(sk);
1254         void __user *argp = (void __user *)arg;
1255         int rc;
1256
1257         switch (cmd) {
1258                 case TIOCOUTQ: {
1259                         int amount = sk->sk_sndbuf -
1260                                      atomic_read(&sk->sk_wmem_alloc);
1261                         if (amount < 0)
1262                                 amount = 0;
1263                         rc = put_user(amount, (unsigned int __user *)argp);
1264                         break;
1265                 }
1266
1267                 case TIOCINQ: {
1268                         struct sk_buff *skb;
1269                         int amount = 0;
1270                         /*
1271                          * These two are safe on a single CPU system as
1272                          * only user tasks fiddle here
1273                          */
1274                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1275                                 amount = skb->len;
1276                         rc = put_user(amount, (unsigned int __user *)argp);
1277                         break;
1278                 }
1279
1280                 case SIOCGSTAMP:
1281                         rc = -EINVAL;
1282                         if (sk)
1283                                 rc = sock_get_timestamp(sk,
1284                                                 (struct timeval __user *)argp);
1285                         break;
1286                 case SIOCGSTAMPNS:
1287                         rc = -EINVAL;
1288                         if (sk)
1289                                 rc = sock_get_timestampns(sk,
1290                                                 (struct timespec __user *)argp);
1291                         break;
1292                 case SIOCGIFADDR:
1293                 case SIOCSIFADDR:
1294                 case SIOCGIFDSTADDR:
1295                 case SIOCSIFDSTADDR:
1296                 case SIOCGIFBRDADDR:
1297                 case SIOCSIFBRDADDR:
1298                 case SIOCGIFNETMASK:
1299                 case SIOCSIFNETMASK:
1300                 case SIOCGIFMETRIC:
1301                 case SIOCSIFMETRIC:
1302                         rc = -EINVAL;
1303                         break;
1304                 case SIOCADDRT:
1305                 case SIOCDELRT:
1306                         rc = -EPERM;
1307                         if (!capable(CAP_NET_ADMIN))
1308                                 break;
1309                         rc = x25_route_ioctl(cmd, argp);
1310                         break;
1311                 case SIOCX25GSUBSCRIP:
1312                         rc = x25_subscr_ioctl(cmd, argp);
1313                         break;
1314                 case SIOCX25SSUBSCRIP:
1315                         rc = -EPERM;
1316                         if (!capable(CAP_NET_ADMIN))
1317                                 break;
1318                         rc = x25_subscr_ioctl(cmd, argp);
1319                         break;
1320                 case SIOCX25GFACILITIES: {
1321                         struct x25_facilities fac = x25->facilities;
1322                         rc = copy_to_user(argp, &fac,
1323                                           sizeof(fac)) ? -EFAULT : 0;
1324                         break;
1325                 }
1326
1327                 case SIOCX25SFACILITIES: {
1328                         struct x25_facilities facilities;
1329                         rc = -EFAULT;
1330                         if (copy_from_user(&facilities, argp,
1331                                            sizeof(facilities)))
1332                                 break;
1333                         rc = -EINVAL;
1334                         if (sk->sk_state != TCP_LISTEN &&
1335                             sk->sk_state != TCP_CLOSE)
1336                                 break;
1337                         if (facilities.pacsize_in < X25_PS16 ||
1338                             facilities.pacsize_in > X25_PS4096)
1339                                 break;
1340                         if (facilities.pacsize_out < X25_PS16 ||
1341                             facilities.pacsize_out > X25_PS4096)
1342                                 break;
1343                         if (facilities.winsize_in < 1 ||
1344                             facilities.winsize_in > 127)
1345                                 break;
1346                         if (facilities.throughput < 0x03 ||
1347                             facilities.throughput > 0xDD)
1348                                 break;
1349                         if (facilities.reverse &&
1350                                 (facilities.reverse | 0x81)!= 0x81)
1351                                 break;
1352                         x25->facilities = facilities;
1353                         rc = 0;
1354                         break;
1355                 }
1356
1357                 case SIOCX25GDTEFACILITIES: {
1358                         rc = copy_to_user(argp, &x25->dte_facilities,
1359                                                 sizeof(x25->dte_facilities));
1360                         if (rc)
1361                                 rc = -EFAULT;
1362                         break;
1363                 }
1364
1365                 case SIOCX25SDTEFACILITIES: {
1366                         struct x25_dte_facilities dtefacs;
1367                         rc = -EFAULT;
1368                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1369                                 break;
1370                         rc = -EINVAL;
1371                         if (sk->sk_state != TCP_LISTEN &&
1372                                         sk->sk_state != TCP_CLOSE)
1373                                 break;
1374                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1375                                 break;
1376                         if (dtefacs.calling_ae == NULL)
1377                                 break;
1378                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1379                                 break;
1380                         if (dtefacs.called_ae == NULL)
1381                                 break;
1382                         x25->dte_facilities = dtefacs;
1383                         rc = 0;
1384                         break;
1385                 }
1386
1387                 case SIOCX25GCALLUSERDATA: {
1388                         struct x25_calluserdata cud = x25->calluserdata;
1389                         rc = copy_to_user(argp, &cud,
1390                                           sizeof(cud)) ? -EFAULT : 0;
1391                         break;
1392                 }
1393
1394                 case SIOCX25SCALLUSERDATA: {
1395                         struct x25_calluserdata calluserdata;
1396
1397                         rc = -EFAULT;
1398                         if (copy_from_user(&calluserdata, argp,
1399                                            sizeof(calluserdata)))
1400                                 break;
1401                         rc = -EINVAL;
1402                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1403                                 break;
1404                         x25->calluserdata = calluserdata;
1405                         rc = 0;
1406                         break;
1407                 }
1408
1409                 case SIOCX25GCAUSEDIAG: {
1410                         struct x25_causediag causediag;
1411                         causediag = x25->causediag;
1412                         rc = copy_to_user(argp, &causediag,
1413                                           sizeof(causediag)) ? -EFAULT : 0;
1414                         break;
1415                 }
1416
1417                 case SIOCX25SCUDMATCHLEN: {
1418                         struct x25_subaddr sub_addr;
1419                         rc = -EINVAL;
1420                         if(sk->sk_state != TCP_CLOSE)
1421                                 break;
1422                         rc = -EFAULT;
1423                         if (copy_from_user(&sub_addr, argp,
1424                                         sizeof(sub_addr)))
1425                                 break;
1426                         rc = -EINVAL;
1427                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1428                                 break;
1429                         x25->cudmatchlength = sub_addr.cudmatchlength;
1430                         rc = 0;
1431                         break;
1432                 }
1433
1434                 case SIOCX25CALLACCPTAPPRV: {
1435                         rc = -EINVAL;
1436                         if (sk->sk_state != TCP_CLOSE)
1437                                 break;
1438                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1439                         rc = 0;
1440                         break;
1441                 }
1442
1443                 case SIOCX25SENDCALLACCPT:  {
1444                         rc = -EINVAL;
1445                         if (sk->sk_state != TCP_ESTABLISHED)
1446                                 break;
1447                         if (x25->accptapprv)    /* must call accptapprv above */
1448                                 break;
1449                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1450                         x25->state = X25_STATE_3;
1451                         rc = 0;
1452                         break;
1453                 }
1454
1455                 default:
1456                         rc = -ENOIOCTLCMD;
1457                         break;
1458         }
1459
1460         return rc;
1461 }
1462
1463 static struct net_proto_family x25_family_ops = {
1464         .family =       AF_X25,
1465         .create =       x25_create,
1466         .owner  =       THIS_MODULE,
1467 };
1468
1469 #ifdef CONFIG_COMPAT
1470 static int compat_x25_subscr_ioctl(unsigned int cmd,
1471                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1472 {
1473         struct compat_x25_subscrip_struct x25_subscr;
1474         struct x25_neigh *nb;
1475         struct net_device *dev;
1476         int rc = -EINVAL;
1477
1478         rc = -EFAULT;
1479         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1480                 goto out;
1481
1482         rc = -EINVAL;
1483         dev = x25_dev_get(x25_subscr.device);
1484         if (dev == NULL)
1485                 goto out;
1486
1487         nb = x25_get_neigh(dev);
1488         if (nb == NULL)
1489                 goto out_dev_put;
1490
1491         dev_put(dev);
1492
1493         if (cmd == SIOCX25GSUBSCRIP) {
1494                 x25_subscr.extended = nb->extended;
1495                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1496                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1497                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1498         } else {
1499                 rc = -EINVAL;
1500                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1501                         rc = 0;
1502                         nb->extended = x25_subscr.extended;
1503                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1504                 }
1505         }
1506         x25_neigh_put(nb);
1507 out:
1508         return rc;
1509 out_dev_put:
1510         dev_put(dev);
1511         goto out;
1512 }
1513
1514 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1515                                 unsigned long arg)
1516 {
1517         void __user *argp = compat_ptr(arg);
1518         struct sock *sk = sock->sk;
1519
1520         int rc = -ENOIOCTLCMD;
1521
1522         switch(cmd) {
1523         case TIOCOUTQ:
1524         case TIOCINQ:
1525                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1526                 break;
1527         case SIOCGSTAMP:
1528                 rc = -EINVAL;
1529                 if (sk)
1530                         rc = compat_sock_get_timestamp(sk,
1531                                         (struct timeval __user*)argp);
1532                 break;
1533         case SIOCGSTAMPNS:
1534                 rc = -EINVAL;
1535                 if (sk)
1536                         rc = compat_sock_get_timestampns(sk,
1537                                         (struct timespec __user*)argp);
1538                 break;
1539         case SIOCGIFADDR:
1540         case SIOCSIFADDR:
1541         case SIOCGIFDSTADDR:
1542         case SIOCSIFDSTADDR:
1543         case SIOCGIFBRDADDR:
1544         case SIOCSIFBRDADDR:
1545         case SIOCGIFNETMASK:
1546         case SIOCSIFNETMASK:
1547         case SIOCGIFMETRIC:
1548         case SIOCSIFMETRIC:
1549                 rc = -EINVAL;
1550                 break;
1551         case SIOCADDRT:
1552         case SIOCDELRT:
1553                 rc = -EPERM;
1554                 if (!capable(CAP_NET_ADMIN))
1555                         break;
1556                 rc = x25_route_ioctl(cmd, argp);
1557                 break;
1558         case SIOCX25GSUBSCRIP:
1559                 rc = compat_x25_subscr_ioctl(cmd, argp);
1560                 break;
1561         case SIOCX25SSUBSCRIP:
1562                 rc = -EPERM;
1563                 if (!capable(CAP_NET_ADMIN))
1564                         break;
1565                 rc = compat_x25_subscr_ioctl(cmd, argp);
1566                 break;
1567         case SIOCX25GFACILITIES:
1568         case SIOCX25SFACILITIES:
1569         case SIOCX25GDTEFACILITIES:
1570         case SIOCX25SDTEFACILITIES:
1571         case SIOCX25GCALLUSERDATA:
1572         case SIOCX25SCALLUSERDATA:
1573         case SIOCX25GCAUSEDIAG:
1574         case SIOCX25SCUDMATCHLEN:
1575         case SIOCX25CALLACCPTAPPRV:
1576         case SIOCX25SENDCALLACCPT:
1577                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1578                 break;
1579         default:
1580                 rc = -ENOIOCTLCMD;
1581                 break;
1582         }
1583         return rc;
1584 }
1585 #endif
1586
1587 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1588         .family =       AF_X25,
1589         .owner =        THIS_MODULE,
1590         .release =      x25_release,
1591         .bind =         x25_bind,
1592         .connect =      x25_connect,
1593         .socketpair =   sock_no_socketpair,
1594         .accept =       x25_accept,
1595         .getname =      x25_getname,
1596         .poll =         datagram_poll,
1597         .ioctl =        x25_ioctl,
1598 #ifdef CONFIG_COMPAT
1599         .compat_ioctl = compat_x25_ioctl,
1600 #endif
1601         .listen =       x25_listen,
1602         .shutdown =     sock_no_shutdown,
1603         .setsockopt =   x25_setsockopt,
1604         .getsockopt =   x25_getsockopt,
1605         .sendmsg =      x25_sendmsg,
1606         .recvmsg =      x25_recvmsg,
1607         .mmap =         sock_no_mmap,
1608         .sendpage =     sock_no_sendpage,
1609 };
1610
1611 SOCKOPS_WRAP(x25_proto, AF_X25);
1612
1613 static struct packet_type x25_packet_type = {
1614         .type = __constant_htons(ETH_P_X25),
1615         .func = x25_lapb_receive_frame,
1616 };
1617
1618 static struct notifier_block x25_dev_notifier = {
1619         .notifier_call = x25_device_event,
1620 };
1621
1622 void x25_kill_by_neigh(struct x25_neigh *nb)
1623 {
1624         struct sock *s;
1625         struct hlist_node *node;
1626
1627         write_lock_bh(&x25_list_lock);
1628
1629         sk_for_each(s, node, &x25_list)
1630                 if (x25_sk(s)->neighbour == nb)
1631                         x25_disconnect(s, ENETUNREACH, 0, 0);
1632
1633         write_unlock_bh(&x25_list_lock);
1634
1635         /* Remove any related forwards */
1636         x25_clear_forward_by_dev(nb->dev);
1637 }
1638
1639 static int __init x25_init(void)
1640 {
1641         int rc = proto_register(&x25_proto, 0);
1642
1643         if (rc != 0)
1644                 goto out;
1645
1646         sock_register(&x25_family_ops);
1647
1648         dev_add_pack(&x25_packet_type);
1649
1650         register_netdevice_notifier(&x25_dev_notifier);
1651
1652         printk(KERN_INFO "X.25 for Linux. Version 0.2 for Linux 2.1.15\n");
1653
1654 #ifdef CONFIG_SYSCTL
1655         x25_register_sysctl();
1656 #endif
1657         x25_proc_init();
1658 out:
1659         return rc;
1660 }
1661 module_init(x25_init);
1662
1663 static void __exit x25_exit(void)
1664 {
1665         x25_proc_exit();
1666         x25_link_free();
1667         x25_route_free();
1668
1669 #ifdef CONFIG_SYSCTL
1670         x25_unregister_sysctl();
1671 #endif
1672
1673         unregister_netdevice_notifier(&x25_dev_notifier);
1674
1675         dev_remove_pack(&x25_packet_type);
1676
1677         sock_unregister(AF_X25);
1678         proto_unregister(&x25_proto);
1679 }
1680 module_exit(x25_exit);
1681
1682 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1683 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1684 MODULE_LICENSE("GPL");
1685 MODULE_ALIAS_NETPROTO(PF_X25);