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