net/x25/af_x25.c

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/capability.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/smp_lock.h>
  44 #include <linux/timer.h>
  45 #include <linux/string.h>
  46 #include <linux/net.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/skbuff.h>
  50 #include <net/sock.h>
  51 #include <net/tcp_states.h>
  52 #include <asm/uaccess.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  55 #include <linux/notifier.h>
  56 #include <linux/init.h>
  57 #include <linux/compat.h>
  58
  59 #include <net/x25.h>
  60 #include <net/compat.h>
  61
  62 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  63 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  64 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  65 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  66 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  67 int sysctl_x25_forward                 = 0;
  68
  69 HLIST_HEAD(x25_list);
  70 DEFINE_RWLOCK(x25_list_lock);
  71
  72 static const struct proto_ops x25_proto_ops;
  73
  74 static struct x25_address null_x25_address = {"               "};
  75
  76 #ifdef CONFIG_COMPAT
  77 struct compat_x25_subscrip_struct {
  78         char device[200-sizeof(compat_ulong_t)];
  79         compat_ulong_t global_facil_mask;
  80         compat_uint_t extended;
  81 };
  82 #endif
  83
  84 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  85                   struct x25_address *calling_addr)
  86 {
  87         unsigned int called_len, calling_len;
  88         char *called, *calling;
  89         unsigned int i;
  90
  91         called_len  = (*p >> 0) & 0x0F;
  92         calling_len = (*p >> 4) & 0x0F;
  93
  94         called  = called_addr->x25_addr;
  95         calling = calling_addr->x25_addr;
  96         p++;
  97
  98         for (i = 0; i < (called_len + calling_len); i++) {
  99                 if (i < called_len) {
 100                         if (i % 2 != 0) {
 101                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 102                                 p++;
 103                         } else {
 104                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 105                         }
 106                 } else {
 107                         if (i % 2 != 0) {
 108                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 109                                 p++;
 110                         } else {
 111                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 112                         }
 113                 }
 114         }
 115
 116         *called = *calling = '\0';
 117
 118         return 1 + (called_len + calling_len + 1) / 2;
 119 }
 120
 121 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 122                   struct x25_address *calling_addr)
 123 {
 124         unsigned int called_len, calling_len;
 125         char *called, *calling;
 126         int i;
 127
 128         called  = called_addr->x25_addr;
 129         calling = calling_addr->x25_addr;
 130
 131         called_len  = strlen(called);
 132         calling_len = strlen(calling);
 133
 134         *p++ = (calling_len << 4) | (called_len << 0);
 135
 136         for (i = 0; i < (called_len + calling_len); i++) {
 137                 if (i < called_len) {
 138                         if (i % 2 != 0) {
 139                                 *p |= (*called++ - '0') << 0;
 140                                 p++;
 141                         } else {
 142                                 *p = 0x00;
 143                                 *p |= (*called++ - '0') << 4;
 144                         }
 145                 } else {
 146                         if (i % 2 != 0) {
 147                                 *p |= (*calling++ - '0') << 0;
 148                                 p++;
 149                         } else {
 150                                 *p = 0x00;
 151                                 *p |= (*calling++ - '0') << 4;
 152                         }
 153                 }
 154         }
 155
 156         return 1 + (called_len + calling_len + 1) / 2;
 157 }
 158
 159 /*
 160  *      Socket removal during an interrupt is now safe.
 161  */
 162 static void x25_remove_socket(struct sock *sk)
 163 {
 164         write_lock_bh(&x25_list_lock);
 165         sk_del_node_init(sk);
 166         write_unlock_bh(&x25_list_lock);
 167 }
 168
 169 /*
 170  *      Kill all bound sockets on a dropped device.
 171  */
 172 static void x25_kill_by_device(struct net_device *dev)
 173 {
 174         struct sock *s;
 175         struct hlist_node *node;
 176
 177         write_lock_bh(&x25_list_lock);
 178
 179         sk_for_each(s, node, &x25_list)
 180                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 181                         x25_disconnect(s, ENETUNREACH, 0, 0);
 182
 183         write_unlock_bh(&x25_list_lock);
 184 }
 185
 186 /*
 187  *      Handle device status changes.
 188  */
 189 static int x25_device_event(struct notifier_block *this, unsigned long event,
 190                             void *ptr)
 191 {
 192         struct net_device *dev = ptr;
 193         struct x25_neigh *nb;
 194
 195         if (!net_eq(dev_net(dev), &init_net))
 196                 return NOTIFY_DONE;
 197
 198         if (dev->type == ARPHRD_X25
 199 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 200          || dev->type == ARPHRD_ETHER
 201 #endif
 202          ) {
 203                 switch (event) {
 204                         case NETDEV_UP:
 205                                 x25_link_device_up(dev);
 206                                 break;
 207                         case NETDEV_GOING_DOWN:
 208                                 nb = x25_get_neigh(dev);
 209                                 if (nb) {
 210                                         x25_terminate_link(nb);
 211                                         x25_neigh_put(nb);
 212                                 }
 213                                 break;
 214                         case NETDEV_DOWN:
 215                                 x25_kill_by_device(dev);
 216                                 x25_route_device_down(dev);
 217                                 x25_link_device_down(dev);
 218                                 break;
 219                 }
 220         }
 221
 222         return NOTIFY_DONE;
 223 }
 224
 225 /*
 226  *      Add a socket to the bound sockets list.
 227  */
 228 static void x25_insert_socket(struct sock *sk)
 229 {
 230         write_lock_bh(&x25_list_lock);
 231         sk_add_node(sk, &x25_list);
 232         write_unlock_bh(&x25_list_lock);
 233 }
 234
 235 /*
 236  *      Find a socket that wants to accept the Call Request we just
 237  *      received. Check the full list for an address/cud match.
 238  *      If no cuds match return the next_best thing, an address match.
 239  *      Note: if a listening socket has cud set it must only get calls
 240  *      with matching cud.
 241  */
 242 static struct sock *x25_find_listener(struct x25_address *addr,
 243                                         struct sk_buff *skb)
 244 {
 245         struct sock *s;
 246         struct sock *next_best;
 247         struct hlist_node *node;
 248
 249         read_lock_bh(&x25_list_lock);
 250         next_best = NULL;
 251
 252         sk_for_each(s, node, &x25_list)
 253                 if ((!strcmp(addr->x25_addr,
 254                         x25_sk(s)->source_addr.x25_addr) ||
 255                                 !strcmp(addr->x25_addr,
 256                                         null_x25_address.x25_addr)) &&
 257                                         s->sk_state == TCP_LISTEN) {
 258                         /*
 259                          * Found a listening socket, now check the incoming
 260                          * call user data vs this sockets call user data
 261                          */
 262                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 263                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 264                                         skb->data,
 265                                         x25_sk(s)->cudmatchlength)) == 0) {
 266                                         sock_hold(s);
 267                                         goto found;
 268                                  }
 269                         } else
 270                                 next_best = s;
 271                 }
 272         if (next_best) {
 273                 s = next_best;
 274                 sock_hold(s);
 275                 goto found;
 276         }
 277         s = NULL;
 278 found:
 279         read_unlock_bh(&x25_list_lock);
 280         return s;
 281 }
 282
 283 /*
 284  *      Find a connected X.25 socket given my LCI and neighbour.
 285  */
 286 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 287 {
 288         struct sock *s;
 289         struct hlist_node *node;
 290
 291         sk_for_each(s, node, &x25_list)
 292                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 293                         sock_hold(s);
 294                         goto found;
 295                 }
 296         s = NULL;
 297 found:
 298         return s;
 299 }
 300
 301 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 302 {
 303         struct sock *s;
 304
 305         read_lock_bh(&x25_list_lock);
 306         s = __x25_find_socket(lci, nb);
 307         read_unlock_bh(&x25_list_lock);
 308         return s;
 309 }
 310
 311 /*
 312  *      Find a unique LCI for a given device.
 313  */
 314 static unsigned int x25_new_lci(struct x25_neigh *nb)
 315 {
 316         unsigned int lci = 1;
 317         struct sock *sk;
 318
 319         read_lock_bh(&x25_list_lock);
 320
 321         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 322                 sock_put(sk);
 323                 if (++lci == 4096) {
 324                         lci = 0;
 325                         break;
 326                 }
 327         }
 328
 329         read_unlock_bh(&x25_list_lock);
 330         return lci;
 331 }
 332
 333 /*
 334  *      Deferred destroy.
 335  */
 336 static void __x25_destroy_socket(struct sock *);
 337
 338 /*
 339  *      handler for deferred kills.
 340  */
 341 static void x25_destroy_timer(unsigned long data)
 342 {
 343         x25_destroy_socket_from_timer((struct sock *)data);
 344 }
 345
 346 /*
 347  *      This is called from user mode and the timers. Thus it protects itself
 348  *      against interrupt users but doesn't worry about being called during
 349  *      work. Once it is removed from the queue no interrupt or bottom half
 350  *      will touch it and we are (fairly 8-) ) safe.
 351  *      Not static as it's used by the timer
 352  */
 353 static void __x25_destroy_socket(struct sock *sk)
 354 {
 355         struct sk_buff *skb;
 356
 357         x25_stop_heartbeat(sk);
 358         x25_stop_timer(sk);
 359
 360         x25_remove_socket(sk);
 361         x25_clear_queues(sk);           /* Flush the queues */
 362
 363         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 364                 if (skb->sk != sk) {            /* A pending connection */
 365                         /*
 366                          * Queue the unaccepted socket for death
 367                          */
 368                         sock_set_flag(skb->sk, SOCK_DEAD);
 369                         x25_start_heartbeat(skb->sk);
 370                         x25_sk(skb->sk)->state = X25_STATE_0;
 371                 }
 372
 373                 kfree_skb(skb);
 374         }
 375
 376         if (sk_has_allocations(sk)) {
 377                 /* Defer: outstanding buffers */
 378                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 379                 sk->sk_timer.function = x25_destroy_timer;
 380                 sk->sk_timer.data = (unsigned long)sk;
 381                 add_timer(&sk->sk_timer);
 382         } else {
 383                 /* drop last reference so sock_put will free */
 384                 __sock_put(sk);
 385         }
 386 }
 387
 388 void x25_destroy_socket_from_timer(struct sock *sk)
 389 {
 390         sock_hold(sk);
 391         bh_lock_sock(sk);
 392         __x25_destroy_socket(sk);
 393         bh_unlock_sock(sk);
 394         sock_put(sk);
 395 }
 396
 397 static void x25_destroy_socket(struct sock *sk)
 398 {
 399         sock_hold(sk);
 400         lock_sock(sk);
 401         __x25_destroy_socket(sk);
 402         release_sock(sk);
 403         sock_put(sk);
 404 }
 405
 406 /*
 407  *      Handling for system calls applied via the various interfaces to a
 408  *      X.25 socket object.
 409  */
 410
 411 static int x25_setsockopt(struct socket *sock, int level, int optname,
 412                           char __user *optval, unsigned int optlen)
 413 {
 414         int opt;
 415         struct sock *sk = sock->sk;
 416         int rc = -ENOPROTOOPT;
 417
 418         if (level != SOL_X25 || optname != X25_QBITINCL)
 419                 goto out;
 420
 421         rc = -EINVAL;
 422         if (optlen < sizeof(int))
 423                 goto out;
 424
 425         rc = -EFAULT;
 426         if (get_user(opt, (int __user *)optval))
 427                 goto out;
 428
 429         x25_sk(sk)->qbitincl = !!opt;
 430         rc = 0;
 431 out:
 432         return rc;
 433 }
 434
 435 static int x25_getsockopt(struct socket *sock, int level, int optname,
 436                           char __user *optval, int __user *optlen)
 437 {
 438         struct sock *sk = sock->sk;
 439         int val, len, rc = -ENOPROTOOPT;
 440
 441         if (level != SOL_X25 || optname != X25_QBITINCL)
 442                 goto out;
 443
 444         rc = -EFAULT;
 445         if (get_user(len, optlen))
 446                 goto out;
 447
 448         len = min_t(unsigned int, len, sizeof(int));
 449
 450         rc = -EINVAL;
 451         if (len < 0)
 452                 goto out;
 453
 454         rc = -EFAULT;
 455         if (put_user(len, optlen))
 456                 goto out;
 457
 458         val = x25_sk(sk)->qbitincl;
 459         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 460 out:
 461         return rc;
 462 }
 463
 464 static int x25_listen(struct socket *sock, int backlog)
 465 {
 466         struct sock *sk = sock->sk;
 467         int rc = -EOPNOTSUPP;
 468
 469         if (sk->sk_state != TCP_LISTEN) {
 470                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 471                 sk->sk_max_ack_backlog = backlog;
 472                 sk->sk_state           = TCP_LISTEN;
 473                 rc = 0;
 474         }
 475
 476         return rc;
 477 }
 478
 479 static struct proto x25_proto = {
 480         .name     = "X25",
 481         .owner    = THIS_MODULE,
 482         .obj_size = sizeof(struct x25_sock),
 483 };
 484
 485 static struct sock *x25_alloc_socket(struct net *net)
 486 {
 487         struct x25_sock *x25;
 488         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 489
 490         if (!sk)
 491                 goto out;
 492
 493         sock_init_data(NULL, sk);
 494
 495         x25 = x25_sk(sk);
 496         skb_queue_head_init(&x25->ack_queue);
 497         skb_queue_head_init(&x25->fragment_queue);
 498         skb_queue_head_init(&x25->interrupt_in_queue);
 499         skb_queue_head_init(&x25->interrupt_out_queue);
 500 out:
 501         return sk;
 502 }
 503
 504 static int x25_create(struct net *net, struct socket *sock, int protocol)
 505 {
 506         struct sock *sk;
 507         struct x25_sock *x25;
 508         int rc = -ESOCKTNOSUPPORT;
 509
 510         if (net != &init_net)
 511                 return -EAFNOSUPPORT;
 512
 513         if (sock->type != SOCK_SEQPACKET || protocol)
 514                 goto out;
 515
 516         rc = -ENOMEM;
 517         if ((sk = x25_alloc_socket(net)) == NULL)
 518                 goto out;
 519
 520         x25 = x25_sk(sk);
 521
 522         sock_init_data(sock, sk);
 523
 524         x25_init_timers(sk);
 525
 526         sock->ops    = &x25_proto_ops;
 527         sk->sk_protocol = protocol;
 528         sk->sk_backlog_rcv = x25_backlog_rcv;
 529
 530         x25->t21   = sysctl_x25_call_request_timeout;
 531         x25->t22   = sysctl_x25_reset_request_timeout;
 532         x25->t23   = sysctl_x25_clear_request_timeout;
 533         x25->t2    = sysctl_x25_ack_holdback_timeout;
 534         x25->state = X25_STATE_0;
 535         x25->cudmatchlength = 0;
 536         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 537                                                         /* on call accept   */
 538
 539         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 540         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 541         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 542         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 543         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 544         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 545         x25->dte_facilities.calling_len = 0;
 546         x25->dte_facilities.called_len = 0;
 547         memset(x25->dte_facilities.called_ae, '\0',
 548                         sizeof(x25->dte_facilities.called_ae));
 549         memset(x25->dte_facilities.calling_ae, '\0',
 550                         sizeof(x25->dte_facilities.calling_ae));
 551
 552         rc = 0;
 553 out:
 554         return rc;
 555 }
 556
 557 static struct sock *x25_make_new(struct sock *osk)
 558 {
 559         struct sock *sk = NULL;
 560         struct x25_sock *x25, *ox25;
 561
 562         if (osk->sk_type != SOCK_SEQPACKET)
 563                 goto out;
 564
 565         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 566                 goto out;
 567
 568         x25 = x25_sk(sk);
 569
 570         sk->sk_type        = osk->sk_type;
 571         sk->sk_priority    = osk->sk_priority;
 572         sk->sk_protocol    = osk->sk_protocol;
 573         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 574         sk->sk_sndbuf      = osk->sk_sndbuf;
 575         sk->sk_state       = TCP_ESTABLISHED;
 576         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 577         sock_copy_flags(sk, osk);
 578
 579         ox25 = x25_sk(osk);
 580         x25->t21        = ox25->t21;
 581         x25->t22        = ox25->t22;
 582         x25->t23        = ox25->t23;
 583         x25->t2         = ox25->t2;
 584         x25->facilities = ox25->facilities;
 585         x25->qbitincl   = ox25->qbitincl;
 586         x25->dte_facilities = ox25->dte_facilities;
 587         x25->cudmatchlength = ox25->cudmatchlength;
 588         x25->accptapprv = ox25->accptapprv;
 589
 590         x25_init_timers(sk);
 591 out:
 592         return sk;
 593 }
 594
 595 static int x25_release(struct socket *sock)
 596 {
 597         struct sock *sk = sock->sk;
 598         struct x25_sock *x25;
 599
 600         if (!sk)
 601                 goto out;
 602
 603         x25 = x25_sk(sk);
 604
 605         switch (x25->state) {
 606
 607                 case X25_STATE_0:
 608                 case X25_STATE_2:
 609                         x25_disconnect(sk, 0, 0, 0);
 610                         x25_destroy_socket(sk);
 611                         goto out;
 612
 613                 case X25_STATE_1:
 614                 case X25_STATE_3:
 615                 case X25_STATE_4:
 616                         x25_clear_queues(sk);
 617                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 618                         x25_start_t23timer(sk);
 619                         x25->state = X25_STATE_2;
 620                         sk->sk_state    = TCP_CLOSE;
 621                         sk->sk_shutdown |= SEND_SHUTDOWN;
 622                         sk->sk_state_change(sk);
 623                         sock_set_flag(sk, SOCK_DEAD);
 624                         sock_set_flag(sk, SOCK_DESTROY);
 625                         break;
 626         }
 627
 628         sock_orphan(sk);
 629 out:
 630         return 0;
 631 }
 632
 633 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 634 {
 635         struct sock *sk = sock->sk;
 636         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 637
 638         if (!sock_flag(sk, SOCK_ZAPPED) ||
 639             addr_len != sizeof(struct sockaddr_x25) ||
 640             addr->sx25_family != AF_X25)
 641                 return -EINVAL;
 642
 643         x25_sk(sk)->source_addr = addr->sx25_addr;
 644         x25_insert_socket(sk);
 645         sock_reset_flag(sk, SOCK_ZAPPED);
 646         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 647
 648         return 0;
 649 }
 650
 651 static int x25_wait_for_connection_establishment(struct sock *sk)
 652 {
 653         DECLARE_WAITQUEUE(wait, current);
 654         int rc;
 655
 656         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 657         for (;;) {
 658                 __set_current_state(TASK_INTERRUPTIBLE);
 659                 rc = -ERESTARTSYS;
 660                 if (signal_pending(current))
 661                         break;
 662                 rc = sock_error(sk);
 663                 if (rc) {
 664                         sk->sk_socket->state = SS_UNCONNECTED;
 665                         break;
 666                 }
 667                 rc = 0;
 668                 if (sk->sk_state != TCP_ESTABLISHED) {
 669                         release_sock(sk);
 670                         schedule();
 671                         lock_sock(sk);
 672                 } else
 673                         break;
 674         }
 675         __set_current_state(TASK_RUNNING);
 676         remove_wait_queue(sk->sk_sleep, &wait);
 677         return rc;
 678 }
 679
 680 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 681                        int addr_len, int flags)
 682 {
 683         struct sock *sk = sock->sk;
 684         struct x25_sock *x25 = x25_sk(sk);
 685         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 686         struct x25_route *rt;
 687         int rc = 0;
 688
 689         lock_sock(sk);
 690         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 691                 sock->state = SS_CONNECTED;
 692                 goto out; /* Connect completed during a ERESTARTSYS event */
 693         }
 694
 695         rc = -ECONNREFUSED;
 696         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 697                 sock->state = SS_UNCONNECTED;
 698                 goto out;
 699         }
 700
 701         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 702         if (sk->sk_state == TCP_ESTABLISHED)
 703                 goto out;
 704
 705         sk->sk_state   = TCP_CLOSE;
 706         sock->state = SS_UNCONNECTED;
 707
 708         rc = -EINVAL;
 709         if (addr_len != sizeof(struct sockaddr_x25) ||
 710             addr->sx25_family != AF_X25)
 711                 goto out;
 712
 713         rc = -ENETUNREACH;
 714         rt = x25_get_route(&addr->sx25_addr);
 715         if (!rt)
 716                 goto out;
 717
 718         x25->neighbour = x25_get_neigh(rt->dev);
 719         if (!x25->neighbour)
 720                 goto out_put_route;
 721
 722         x25_limit_facilities(&x25->facilities, x25->neighbour);
 723
 724         x25->lci = x25_new_lci(x25->neighbour);
 725         if (!x25->lci)
 726                 goto out_put_neigh;
 727
 728         rc = -EINVAL;
 729         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 730                 goto out_put_neigh;
 731
 732         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 733                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 734
 735         x25->dest_addr = addr->sx25_addr;
 736
 737         /* Move to connecting socket, start sending Connect Requests */
 738         sock->state   = SS_CONNECTING;
 739         sk->sk_state  = TCP_SYN_SENT;
 740
 741         x25->state = X25_STATE_1;
 742
 743         x25_write_internal(sk, X25_CALL_REQUEST);
 744
 745         x25_start_heartbeat(sk);
 746         x25_start_t21timer(sk);
 747
 748         /* Now the loop */
 749         rc = -EINPROGRESS;
 750         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 751                 goto out_put_neigh;
 752
 753         rc = x25_wait_for_connection_establishment(sk);
 754         if (rc)
 755                 goto out_put_neigh;
 756
 757         sock->state = SS_CONNECTED;
 758         rc = 0;
 759 out_put_neigh:
 760         if (rc)
 761                 x25_neigh_put(x25->neighbour);
 762 out_put_route:
 763         x25_route_put(rt);
 764 out:
 765         release_sock(sk);
 766         return rc;
 767 }
 768
 769 static int x25_wait_for_data(struct sock *sk, long timeout)
 770 {
 771         DECLARE_WAITQUEUE(wait, current);
 772         int rc = 0;
 773
 774         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 775         for (;;) {
 776                 __set_current_state(TASK_INTERRUPTIBLE);
 777                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 778                         break;
 779                 rc = -ERESTARTSYS;
 780                 if (signal_pending(current))
 781                         break;
 782                 rc = -EAGAIN;
 783                 if (!timeout)
 784                         break;
 785                 rc = 0;
 786                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 787                         release_sock(sk);
 788                         timeout = schedule_timeout(timeout);
 789                         lock_sock(sk);
 790                 } else
 791                         break;
 792         }
 793         __set_current_state(TASK_RUNNING);
 794         remove_wait_queue(sk->sk_sleep, &wait);
 795         return rc;
 796 }
 797
 798 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 799 {
 800         struct sock *sk = sock->sk;
 801         struct sock *newsk;
 802         struct sk_buff *skb;
 803         int rc = -EINVAL;
 804
 805         if (!sk || sk->sk_state != TCP_LISTEN)
 806                 goto out;
 807
 808         rc = -EOPNOTSUPP;
 809         if (sk->sk_type != SOCK_SEQPACKET)
 810                 goto out;
 811
 812         lock_sock(sk);
 813         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 814         if (rc)
 815                 goto out2;
 816         skb = skb_dequeue(&sk->sk_receive_queue);
 817         rc = -EINVAL;
 818         if (!skb->sk)
 819                 goto out2;
 820         newsk            = skb->sk;
 821         sock_graft(newsk, newsock);
 822
 823         /* Now attach up the new socket */
 824         skb->sk = NULL;
 825         kfree_skb(skb);
 826         sk->sk_ack_backlog--;
 827         newsock->state = SS_CONNECTED;
 828         rc = 0;
 829 out2:
 830         release_sock(sk);
 831 out:
 832         return rc;
 833 }
 834
 835 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 836                        int *uaddr_len, int peer)
 837 {
 838         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 839         struct sock *sk = sock->sk;
 840         struct x25_sock *x25 = x25_sk(sk);
 841
 842         if (peer) {
 843                 if (sk->sk_state != TCP_ESTABLISHED)
 844                         return -ENOTCONN;
 845                 sx25->sx25_addr = x25->dest_addr;
 846         } else
 847                 sx25->sx25_addr = x25->source_addr;
 848
 849         sx25->sx25_family = AF_X25;
 850         *uaddr_len = sizeof(*sx25);
 851
 852         return 0;
 853 }
 854
 855 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 856                         unsigned int lci)
 857 {
 858         struct sock *sk;
 859         struct sock *make;
 860         struct x25_sock *makex25;
 861         struct x25_address source_addr, dest_addr;
 862         struct x25_facilities facilities;
 863         struct x25_dte_facilities dte_facilities;
 864         int len, addr_len, rc;
 865
 866         /*
 867          *      Remove the LCI and frame type.
 868          */
 869         skb_pull(skb, X25_STD_MIN_LEN);
 870
 871         /*
 872          *      Extract the X.25 addresses and convert them to ASCII strings,
 873          *      and remove them.
 874          */
 875         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 876         skb_pull(skb, addr_len);
 877
 878         /*
 879          *      Get the length of the facilities, skip past them for the moment
 880          *      get the call user data because this is needed to determine
 881          *      the correct listener
 882          */
 883         len = skb->data[0] + 1;
 884         skb_pull(skb,len);
 885
 886         /*
 887          *      Find a listener for the particular address/cud pair.
 888          */
 889         sk = x25_find_listener(&source_addr,skb);
 890         skb_push(skb,len);
 891
 892         if (sk != NULL && sk_acceptq_is_full(sk)) {
 893                 goto out_sock_put;
 894         }
 895
 896         /*
 897          *      We dont have any listeners for this incoming call.
 898          *      Try forwarding it.
 899          */
 900         if (sk == NULL) {
 901                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 902                 if (sysctl_x25_forward &&
 903                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 904                 {
 905                         /* Call was forwarded, dont process it any more */
 906                         kfree_skb(skb);
 907                         rc = 1;
 908                         goto out;
 909                 } else {
 910                         /* No listeners, can't forward, clear the call */
 911                         goto out_clear_request;
 912                 }
 913         }
 914
 915         /*
 916          *      Try to reach a compromise on the requested facilities.
 917          */
 918         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 919         if (len == -1)
 920                 goto out_sock_put;
 921
 922         /*
 923          * current neighbour/link might impose additional limits
 924          * on certain facilties
 925          */
 926
 927         x25_limit_facilities(&facilities, nb);
 928
 929         /*
 930          *      Try to create a new socket.
 931          */
 932         make = x25_make_new(sk);
 933         if (!make)
 934                 goto out_sock_put;
 935
 936         /*
 937          *      Remove the facilities
 938          */
 939         skb_pull(skb, len);
 940
 941         skb->sk     = make;
 942         make->sk_state = TCP_ESTABLISHED;
 943
 944         makex25 = x25_sk(make);
 945         makex25->lci           = lci;
 946         makex25->dest_addr     = dest_addr;
 947         makex25->source_addr   = source_addr;
 948         makex25->neighbour     = nb;
 949         makex25->facilities    = facilities;
 950         makex25->dte_facilities= dte_facilities;
 951         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 952         /* ensure no reverse facil on accept */
 953         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 954         /* ensure no calling address extension on accept */
 955         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 956         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 957
 958         /* Normally all calls are accepted immediatly */
 959         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 960                 x25_write_internal(make, X25_CALL_ACCEPTED);
 961                 makex25->state = X25_STATE_3;
 962         }
 963
 964         /*
 965          *      Incoming Call User Data.
 966          */
 967         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
 968         makex25->calluserdata.cudlength = skb->len;
 969
 970         sk->sk_ack_backlog++;
 971
 972         x25_insert_socket(make);
 973
 974         skb_queue_head(&sk->sk_receive_queue, skb);
 975
 976         x25_start_heartbeat(make);
 977
 978         if (!sock_flag(sk, SOCK_DEAD))
 979                 sk->sk_data_ready(sk, skb->len);
 980         rc = 1;
 981         sock_put(sk);
 982 out:
 983         return rc;
 984 out_sock_put:
 985         sock_put(sk);
 986 out_clear_request:
 987         rc = 0;
 988         x25_transmit_clear_request(nb, lci, 0x01);
 989         goto out;
 990 }
 991
 992 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 993                        struct msghdr *msg, size_t len)
 994 {
 995         struct sock *sk = sock->sk;
 996         struct x25_sock *x25 = x25_sk(sk);
 997         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 998         struct sockaddr_x25 sx25;
 999         struct sk_buff *skb;
1000         unsigned char *asmptr;
1001         int noblock = msg->msg_flags & MSG_DONTWAIT;
1002         size_t size;
1003         int qbit = 0, rc = -EINVAL;
1004
1005         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1006                 goto out;
1007
1008         /* we currently don't support segmented records at the user interface */
1009         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1010                 goto out;
1011
1012         rc = -EADDRNOTAVAIL;
1013         if (sock_flag(sk, SOCK_ZAPPED))
1014                 goto out;
1015
1016         rc = -EPIPE;
1017         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1018                 send_sig(SIGPIPE, current, 0);
1019                 goto out;
1020         }
1021
1022         rc = -ENETUNREACH;
1023         if (!x25->neighbour)
1024                 goto out;
1025
1026         if (usx25) {
1027                 rc = -EINVAL;
1028                 if (msg->msg_namelen < sizeof(sx25))
1029                         goto out;
1030                 memcpy(&sx25, usx25, sizeof(sx25));
1031                 rc = -EISCONN;
1032                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1033                         goto out;
1034                 rc = -EINVAL;
1035                 if (sx25.sx25_family != AF_X25)
1036                         goto out;
1037         } else {
1038                 /*
1039                  *      FIXME 1003.1g - if the socket is like this because
1040                  *      it has become closed (not started closed) we ought
1041                  *      to SIGPIPE, EPIPE;
1042                  */
1043                 rc = -ENOTCONN;
1044                 if (sk->sk_state != TCP_ESTABLISHED)
1045                         goto out;
1046
1047                 sx25.sx25_family = AF_X25;
1048                 sx25.sx25_addr   = x25->dest_addr;
1049         }
1050
1051         /* Sanity check the packet size */
1052         if (len > 65535) {
1053                 rc = -EMSGSIZE;
1054                 goto out;
1055         }
1056
1057         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1058
1059         /* Build a packet */
1060         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1061
1062         if ((msg->msg_flags & MSG_OOB) && len > 32)
1063                 len = 32;
1064
1065         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1066
1067         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1068         if (!skb)
1069                 goto out;
1070         X25_SKB_CB(skb)->flags = msg->msg_flags;
1071
1072         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1073
1074         /*
1075          *      Put the data on the end
1076          */
1077         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1078
1079         skb_reset_transport_header(skb);
1080         skb_put(skb, len);
1081
1082         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1083         if (rc)
1084                 goto out_kfree_skb;
1085
1086         /*
1087          *      If the Q BIT Include socket option is in force, the first
1088          *      byte of the user data is the logical value of the Q Bit.
1089          */
1090         if (x25->qbitincl) {
1091                 qbit = skb->data[0];
1092                 skb_pull(skb, 1);
1093         }
1094
1095         /*
1096          *      Push down the X.25 header
1097          */
1098         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1099
1100         if (msg->msg_flags & MSG_OOB) {
1101                 if (x25->neighbour->extended) {
1102                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1103                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1104                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1105                         *asmptr++ = X25_INTERRUPT;
1106                 } else {
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_INTERRUPT;
1111                 }
1112         } else {
1113                 if (x25->neighbour->extended) {
1114                         /* Build an Extended X.25 header */
1115                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1116                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1117                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1118                         *asmptr++ = X25_DATA;
1119                         *asmptr++ = X25_DATA;
1120                 } else {
1121                         /* Build an Standard X.25 header */
1122                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1123                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1124                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1125                         *asmptr++ = X25_DATA;
1126                 }
1127
1128                 if (qbit)
1129                         skb->data[0] |= X25_Q_BIT;
1130         }
1131
1132         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1133         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1134
1135         rc = -ENOTCONN;
1136         if (sk->sk_state != TCP_ESTABLISHED)
1137                 goto out_kfree_skb;
1138
1139         if (msg->msg_flags & MSG_OOB)
1140                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1141         else {
1142                 rc = x25_output(sk, skb);
1143                 len = rc;
1144                 if (rc < 0)
1145                         kfree_skb(skb);
1146                 else if (x25->qbitincl)
1147                         len++;
1148         }
1149
1150         /*
1151          * lock_sock() is currently only used to serialize this x25_kick()
1152          * against input-driven x25_kick() calls. It currently only blocks
1153          * incoming packets for this socket and does not protect against
1154          * any other socket state changes and is not called from anywhere
1155          * else. As x25_kick() cannot block and as long as all socket
1156          * operations are BKL-wrapped, we don't need take to care about
1157          * purging the backlog queue in x25_release().
1158          *
1159          * Using lock_sock() to protect all socket operations entirely
1160          * (and making the whole x25 stack SMP aware) unfortunately would
1161          * require major changes to {send,recv}msg and skb allocation methods.
1162          * -> 2.5 ;)
1163          */
1164         lock_sock(sk);
1165         x25_kick(sk);
1166         release_sock(sk);
1167         rc = len;
1168 out:
1169         return rc;
1170 out_kfree_skb:
1171         kfree_skb(skb);
1172         goto out;
1173 }
1174
1175
1176 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1177                        struct msghdr *msg, size_t size,
1178                        int flags)
1179 {
1180         struct sock *sk = sock->sk;
1181         struct x25_sock *x25 = x25_sk(sk);
1182         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1183         size_t copied;
1184         int qbit;
1185         struct sk_buff *skb;
1186         unsigned char *asmptr;
1187         int rc = -ENOTCONN;
1188
1189         /*
1190          * This works for seqpacket too. The receiver has ordered the queue for
1191          * us! We do one quick check first though
1192          */
1193         if (sk->sk_state != TCP_ESTABLISHED)
1194                 goto out;
1195
1196         if (flags & MSG_OOB) {
1197                 rc = -EINVAL;
1198                 if (sock_flag(sk, SOCK_URGINLINE) ||
1199                     !skb_peek(&x25->interrupt_in_queue))
1200                         goto out;
1201
1202                 skb = skb_dequeue(&x25->interrupt_in_queue);
1203
1204                 skb_pull(skb, X25_STD_MIN_LEN);
1205
1206                 /*
1207                  *      No Q bit information on Interrupt data.
1208                  */
1209                 if (x25->qbitincl) {
1210                         asmptr  = skb_push(skb, 1);
1211                         *asmptr = 0x00;
1212                 }
1213
1214                 msg->msg_flags |= MSG_OOB;
1215         } else {
1216                 /* Now we can treat all alike */
1217                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1218                                         flags & MSG_DONTWAIT, &rc);
1219                 if (!skb)
1220                         goto out;
1221
1222                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1223
1224                 skb_pull(skb, x25->neighbour->extended ?
1225                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1226
1227                 if (x25->qbitincl) {
1228                         asmptr  = skb_push(skb, 1);
1229                         *asmptr = qbit;
1230                 }
1231         }
1232
1233         skb_reset_transport_header(skb);
1234         copied = skb->len;
1235
1236         if (copied > size) {
1237                 copied = size;
1238                 msg->msg_flags |= MSG_TRUNC;
1239         }
1240
1241         /* Currently, each datagram always contains a complete record */
1242         msg->msg_flags |= MSG_EOR;
1243
1244         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1245         if (rc)
1246                 goto out_free_dgram;
1247
1248         if (sx25) {
1249                 sx25->sx25_family = AF_X25;
1250                 sx25->sx25_addr   = x25->dest_addr;
1251         }
1252
1253         msg->msg_namelen = sizeof(struct sockaddr_x25);
1254
1255         lock_sock(sk);
1256         x25_check_rbuf(sk);
1257         release_sock(sk);
1258         rc = copied;
1259 out_free_dgram:
1260         skb_free_datagram(sk, skb);
1261 out:
1262         return rc;
1263 }
1264
1265
1266 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1267 {
1268         struct sock *sk = sock->sk;
1269         struct x25_sock *x25 = x25_sk(sk);
1270         void __user *argp = (void __user *)arg;
1271         int rc;
1272
1273         switch (cmd) {
1274                 case TIOCOUTQ: {
1275                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1276
1277                         if (amount < 0)
1278                                 amount = 0;
1279                         rc = put_user(amount, (unsigned int __user *)argp);
1280                         break;
1281                 }
1282
1283                 case TIOCINQ: {
1284                         struct sk_buff *skb;
1285                         int amount = 0;
1286                         /*
1287                          * These two are safe on a single CPU system as
1288                          * only user tasks fiddle here
1289                          */
1290                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1291                                 amount = skb->len;
1292                         rc = put_user(amount, (unsigned int __user *)argp);
1293                         break;
1294                 }
1295
1296                 case SIOCGSTAMP:
1297                         rc = -EINVAL;
1298                         if (sk)
1299                                 rc = sock_get_timestamp(sk,
1300                                                 (struct timeval __user *)argp);
1301                         break;
1302                 case SIOCGSTAMPNS:
1303                         rc = -EINVAL;
1304                         if (sk)
1305                                 rc = sock_get_timestampns(sk,
1306                                                 (struct timespec __user *)argp);
1307                         break;
1308                 case SIOCGIFADDR:
1309                 case SIOCSIFADDR:
1310                 case SIOCGIFDSTADDR:
1311                 case SIOCSIFDSTADDR:
1312                 case SIOCGIFBRDADDR:
1313                 case SIOCSIFBRDADDR:
1314                 case SIOCGIFNETMASK:
1315                 case SIOCSIFNETMASK:
1316                 case SIOCGIFMETRIC:
1317                 case SIOCSIFMETRIC:
1318                         rc = -EINVAL;
1319                         break;
1320                 case SIOCADDRT:
1321                 case SIOCDELRT:
1322                         rc = -EPERM;
1323                         if (!capable(CAP_NET_ADMIN))
1324                                 break;
1325                         rc = x25_route_ioctl(cmd, argp);
1326                         break;
1327                 case SIOCX25GSUBSCRIP:
1328                         rc = x25_subscr_ioctl(cmd, argp);
1329                         break;
1330                 case SIOCX25SSUBSCRIP:
1331                         rc = -EPERM;
1332                         if (!capable(CAP_NET_ADMIN))
1333                                 break;
1334                         rc = x25_subscr_ioctl(cmd, argp);
1335                         break;
1336                 case SIOCX25GFACILITIES: {
1337                         struct x25_facilities fac = x25->facilities;
1338                         rc = copy_to_user(argp, &fac,
1339                                           sizeof(fac)) ? -EFAULT : 0;
1340                         break;
1341                 }
1342
1343                 case SIOCX25SFACILITIES: {
1344                         struct x25_facilities facilities;
1345                         rc = -EFAULT;
1346                         if (copy_from_user(&facilities, argp,
1347                                            sizeof(facilities)))
1348                                 break;
1349                         rc = -EINVAL;
1350                         if (sk->sk_state != TCP_LISTEN &&
1351                             sk->sk_state != TCP_CLOSE)
1352                                 break;
1353                         if (facilities.pacsize_in < X25_PS16 ||
1354                             facilities.pacsize_in > X25_PS4096)
1355                                 break;
1356                         if (facilities.pacsize_out < X25_PS16 ||
1357                             facilities.pacsize_out > X25_PS4096)
1358                                 break;
1359                         if (facilities.winsize_in < 1 ||
1360                             facilities.winsize_in > 127)
1361                                 break;
1362                         if (facilities.throughput < 0x03 ||
1363                             facilities.throughput > 0xDD)
1364                                 break;
1365                         if (facilities.reverse &&
1366                                 (facilities.reverse | 0x81)!= 0x81)
1367                                 break;
1368                         x25->facilities = facilities;
1369                         rc = 0;
1370                         break;
1371                 }
1372
1373                 case SIOCX25GDTEFACILITIES: {
1374                         rc = copy_to_user(argp, &x25->dte_facilities,
1375                                                 sizeof(x25->dte_facilities));
1376                         if (rc)
1377                                 rc = -EFAULT;
1378                         break;
1379                 }
1380
1381                 case SIOCX25SDTEFACILITIES: {
1382                         struct x25_dte_facilities dtefacs;
1383                         rc = -EFAULT;
1384                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1385                                 break;
1386                         rc = -EINVAL;
1387                         if (sk->sk_state != TCP_LISTEN &&
1388                                         sk->sk_state != TCP_CLOSE)
1389                                 break;
1390                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1391                                 break;
1392                         if (dtefacs.calling_ae == NULL)
1393                                 break;
1394                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1395                                 break;
1396                         if (dtefacs.called_ae == NULL)
1397                                 break;
1398                         x25->dte_facilities = dtefacs;
1399                         rc = 0;
1400                         break;
1401                 }
1402
1403                 case SIOCX25GCALLUSERDATA: {
1404                         struct x25_calluserdata cud = x25->calluserdata;
1405                         rc = copy_to_user(argp, &cud,
1406                                           sizeof(cud)) ? -EFAULT : 0;
1407                         break;
1408                 }
1409
1410                 case SIOCX25SCALLUSERDATA: {
1411                         struct x25_calluserdata calluserdata;
1412
1413                         rc = -EFAULT;
1414                         if (copy_from_user(&calluserdata, argp,
1415                                            sizeof(calluserdata)))
1416                                 break;
1417                         rc = -EINVAL;
1418                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1419                                 break;
1420                         x25->calluserdata = calluserdata;
1421                         rc = 0;
1422                         break;
1423                 }
1424
1425                 case SIOCX25GCAUSEDIAG: {
1426                         struct x25_causediag causediag;
1427                         causediag = x25->causediag;
1428                         rc = copy_to_user(argp, &causediag,
1429                                           sizeof(causediag)) ? -EFAULT : 0;
1430                         break;
1431                 }
1432
1433                 case SIOCX25SCUDMATCHLEN: {
1434                         struct x25_subaddr sub_addr;
1435                         rc = -EINVAL;
1436                         if(sk->sk_state != TCP_CLOSE)
1437                                 break;
1438                         rc = -EFAULT;
1439                         if (copy_from_user(&sub_addr, argp,
1440                                         sizeof(sub_addr)))
1441                                 break;
1442                         rc = -EINVAL;
1443                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1444                                 break;
1445                         x25->cudmatchlength = sub_addr.cudmatchlength;
1446                         rc = 0;
1447                         break;
1448                 }
1449
1450                 case SIOCX25CALLACCPTAPPRV: {
1451                         rc = -EINVAL;
1452                         if (sk->sk_state != TCP_CLOSE)
1453                                 break;
1454                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1455                         rc = 0;
1456                         break;
1457                 }
1458
1459                 case SIOCX25SENDCALLACCPT:  {
1460                         rc = -EINVAL;
1461                         if (sk->sk_state != TCP_ESTABLISHED)
1462                                 break;
1463                         if (x25->accptapprv)    /* must call accptapprv above */
1464                                 break;
1465                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1466                         x25->state = X25_STATE_3;
1467                         rc = 0;
1468                         break;
1469                 }
1470
1471                 default:
1472                         rc = -ENOIOCTLCMD;
1473                         break;
1474         }
1475
1476         return rc;
1477 }
1478
1479 static struct net_proto_family x25_family_ops = {
1480         .family =       AF_X25,
1481         .create =       x25_create,
1482         .owner  =       THIS_MODULE,
1483 };
1484
1485 #ifdef CONFIG_COMPAT
1486 static int compat_x25_subscr_ioctl(unsigned int cmd,
1487                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1488 {
1489         struct compat_x25_subscrip_struct x25_subscr;
1490         struct x25_neigh *nb;
1491         struct net_device *dev;
1492         int rc = -EINVAL;
1493
1494         rc = -EFAULT;
1495         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1496                 goto out;
1497
1498         rc = -EINVAL;
1499         dev = x25_dev_get(x25_subscr.device);
1500         if (dev == NULL)
1501                 goto out;
1502
1503         nb = x25_get_neigh(dev);
1504         if (nb == NULL)
1505                 goto out_dev_put;
1506
1507         dev_put(dev);
1508
1509         if (cmd == SIOCX25GSUBSCRIP) {
1510                 x25_subscr.extended = nb->extended;
1511                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1512                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1513                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1514         } else {
1515                 rc = -EINVAL;
1516                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1517                         rc = 0;
1518                         nb->extended = x25_subscr.extended;
1519                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1520                 }
1521         }
1522         x25_neigh_put(nb);
1523 out:
1524         return rc;
1525 out_dev_put:
1526         dev_put(dev);
1527         goto out;
1528 }
1529
1530 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1531                                 unsigned long arg)
1532 {
1533         void __user *argp = compat_ptr(arg);
1534         struct sock *sk = sock->sk;
1535
1536         int rc = -ENOIOCTLCMD;
1537
1538         switch(cmd) {
1539         case TIOCOUTQ:
1540         case TIOCINQ:
1541                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1542                 break;
1543         case SIOCGSTAMP:
1544                 rc = -EINVAL;
1545                 if (sk)
1546                         rc = compat_sock_get_timestamp(sk,
1547                                         (struct timeval __user*)argp);
1548                 break;
1549         case SIOCGSTAMPNS:
1550                 rc = -EINVAL;
1551                 if (sk)
1552                         rc = compat_sock_get_timestampns(sk,
1553                                         (struct timespec __user*)argp);
1554                 break;
1555         case SIOCGIFADDR:
1556         case SIOCSIFADDR:
1557         case SIOCGIFDSTADDR:
1558         case SIOCSIFDSTADDR:
1559         case SIOCGIFBRDADDR:
1560         case SIOCSIFBRDADDR:
1561         case SIOCGIFNETMASK:
1562         case SIOCSIFNETMASK:
1563         case SIOCGIFMETRIC:
1564         case SIOCSIFMETRIC:
1565                 rc = -EINVAL;
1566                 break;
1567         case SIOCADDRT:
1568         case SIOCDELRT:
1569                 rc = -EPERM;
1570                 if (!capable(CAP_NET_ADMIN))
1571                         break;
1572                 rc = x25_route_ioctl(cmd, argp);
1573                 break;
1574         case SIOCX25GSUBSCRIP:
1575                 rc = compat_x25_subscr_ioctl(cmd, argp);
1576                 break;
1577         case SIOCX25SSUBSCRIP:
1578                 rc = -EPERM;
1579                 if (!capable(CAP_NET_ADMIN))
1580                         break;
1581                 rc = compat_x25_subscr_ioctl(cmd, argp);
1582                 break;
1583         case SIOCX25GFACILITIES:
1584         case SIOCX25SFACILITIES:
1585         case SIOCX25GDTEFACILITIES:
1586         case SIOCX25SDTEFACILITIES:
1587         case SIOCX25GCALLUSERDATA:
1588         case SIOCX25SCALLUSERDATA:
1589         case SIOCX25GCAUSEDIAG:
1590         case SIOCX25SCUDMATCHLEN:
1591         case SIOCX25CALLACCPTAPPRV:
1592         case SIOCX25SENDCALLACCPT:
1593                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1594                 break;
1595         default:
1596                 rc = -ENOIOCTLCMD;
1597                 break;
1598         }
1599         return rc;
1600 }
1601 #endif
1602
1603 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1604         .family =       AF_X25,
1605         .owner =        THIS_MODULE,
1606         .release =      x25_release,
1607         .bind =         x25_bind,
1608         .connect =      x25_connect,
1609         .socketpair =   sock_no_socketpair,
1610         .accept =       x25_accept,
1611         .getname =      x25_getname,
1612         .poll =         datagram_poll,
1613         .ioctl =        x25_ioctl,
1614 #ifdef CONFIG_COMPAT
1615         .compat_ioctl = compat_x25_ioctl,
1616 #endif
1617         .listen =       x25_listen,
1618         .shutdown =     sock_no_shutdown,
1619         .setsockopt =   x25_setsockopt,
1620         .getsockopt =   x25_getsockopt,
1621         .sendmsg =      x25_sendmsg,
1622         .recvmsg =      x25_recvmsg,
1623         .mmap =         sock_no_mmap,
1624         .sendpage =     sock_no_sendpage,
1625 };
1626
1627 SOCKOPS_WRAP(x25_proto, AF_X25);
1628
1629 static struct packet_type x25_packet_type __read_mostly = {
1630         .type = cpu_to_be16(ETH_P_X25),
1631         .func = x25_lapb_receive_frame,
1632 };
1633
1634 static struct notifier_block x25_dev_notifier = {
1635         .notifier_call = x25_device_event,
1636 };
1637
1638 void x25_kill_by_neigh(struct x25_neigh *nb)
1639 {
1640         struct sock *s;
1641         struct hlist_node *node;
1642
1643         write_lock_bh(&x25_list_lock);
1644
1645         sk_for_each(s, node, &x25_list)
1646                 if (x25_sk(s)->neighbour == nb)
1647                         x25_disconnect(s, ENETUNREACH, 0, 0);
1648
1649         write_unlock_bh(&x25_list_lock);
1650
1651         /* Remove any related forwards */
1652         x25_clear_forward_by_dev(nb->dev);
1653 }
1654
1655 static int __init x25_init(void)
1656 {
1657         int rc = proto_register(&x25_proto, 0);
1658
1659         if (rc != 0)
1660                 goto out;
1661
1662         sock_register(&x25_family_ops);
1663
1664         dev_add_pack(&x25_packet_type);
1665
1666         register_netdevice_notifier(&x25_dev_notifier);
1667
1668         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1669
1670 #ifdef CONFIG_SYSCTL
1671         x25_register_sysctl();
1672 #endif
1673         x25_proc_init();
1674 out:
1675         return rc;
1676 }
1677 module_init(x25_init);
1678
1679 static void __exit x25_exit(void)
1680 {
1681         x25_proc_exit();
1682         x25_link_free();
1683         x25_route_free();
1684
1685 #ifdef CONFIG_SYSCTL
1686         x25_unregister_sysctl();
1687 #endif
1688
1689         unregister_netdevice_notifier(&x25_dev_notifier);
1690
1691         dev_remove_pack(&x25_packet_type);
1692
1693         sock_unregister(AF_X25);
1694         proto_unregister(&x25_proto);
1695 }
1696 module_exit(x25_exit);
1697
1698 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1699 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1700 MODULE_LICENSE("GPL");
1701 MODULE_ALIAS_NETPROTO(PF_X25);