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   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                       int kern)
 506 {
 507         struct sock *sk;
 508         struct x25_sock *x25;
 509         int rc = -ESOCKTNOSUPPORT;
 510
 511         if (net != &init_net)
 512                 return -EAFNOSUPPORT;
 513
 514         if (sock->type != SOCK_SEQPACKET || protocol)
 515                 goto out;
 516
 517         rc = -ENOMEM;
 518         if ((sk = x25_alloc_socket(net)) == NULL)
 519                 goto out;
 520
 521         x25 = x25_sk(sk);
 522
 523         sock_init_data(sock, sk);
 524
 525         x25_init_timers(sk);
 526
 527         sock->ops    = &x25_proto_ops;
 528         sk->sk_protocol = protocol;
 529         sk->sk_backlog_rcv = x25_backlog_rcv;
 530
 531         x25->t21   = sysctl_x25_call_request_timeout;
 532         x25->t22   = sysctl_x25_reset_request_timeout;
 533         x25->t23   = sysctl_x25_clear_request_timeout;
 534         x25->t2    = sysctl_x25_ack_holdback_timeout;
 535         x25->state = X25_STATE_0;
 536         x25->cudmatchlength = 0;
 537         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 538                                                         /* on call accept   */
 539
 540         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 541         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 542         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 543         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 544         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 545         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 546         x25->dte_facilities.calling_len = 0;
 547         x25->dte_facilities.called_len = 0;
 548         memset(x25->dte_facilities.called_ae, '\0',
 549                         sizeof(x25->dte_facilities.called_ae));
 550         memset(x25->dte_facilities.calling_ae, '\0',
 551                         sizeof(x25->dte_facilities.calling_ae));
 552
 553         rc = 0;
 554 out:
 555         return rc;
 556 }
 557
 558 static struct sock *x25_make_new(struct sock *osk)
 559 {
 560         struct sock *sk = NULL;
 561         struct x25_sock *x25, *ox25;
 562
 563         if (osk->sk_type != SOCK_SEQPACKET)
 564                 goto out;
 565
 566         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 567                 goto out;
 568
 569         x25 = x25_sk(sk);
 570
 571         sk->sk_type        = osk->sk_type;
 572         sk->sk_priority    = osk->sk_priority;
 573         sk->sk_protocol    = osk->sk_protocol;
 574         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 575         sk->sk_sndbuf      = osk->sk_sndbuf;
 576         sk->sk_state       = TCP_ESTABLISHED;
 577         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 578         sock_copy_flags(sk, osk);
 579
 580         ox25 = x25_sk(osk);
 581         x25->t21        = ox25->t21;
 582         x25->t22        = ox25->t22;
 583         x25->t23        = ox25->t23;
 584         x25->t2         = ox25->t2;
 585         x25->facilities = ox25->facilities;
 586         x25->qbitincl   = ox25->qbitincl;
 587         x25->dte_facilities = ox25->dte_facilities;
 588         x25->cudmatchlength = ox25->cudmatchlength;
 589         x25->accptapprv = ox25->accptapprv;
 590
 591         x25_init_timers(sk);
 592 out:
 593         return sk;
 594 }
 595
 596 static int x25_release(struct socket *sock)
 597 {
 598         struct sock *sk = sock->sk;
 599         struct x25_sock *x25;
 600
 601         if (!sk)
 602                 goto out;
 603
 604         x25 = x25_sk(sk);
 605
 606         switch (x25->state) {
 607
 608                 case X25_STATE_0:
 609                 case X25_STATE_2:
 610                         x25_disconnect(sk, 0, 0, 0);
 611                         x25_destroy_socket(sk);
 612                         goto out;
 613
 614                 case X25_STATE_1:
 615                 case X25_STATE_3:
 616                 case X25_STATE_4:
 617                         x25_clear_queues(sk);
 618                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 619                         x25_start_t23timer(sk);
 620                         x25->state = X25_STATE_2;
 621                         sk->sk_state    = TCP_CLOSE;
 622                         sk->sk_shutdown |= SEND_SHUTDOWN;
 623                         sk->sk_state_change(sk);
 624                         sock_set_flag(sk, SOCK_DEAD);
 625                         sock_set_flag(sk, SOCK_DESTROY);
 626                         break;
 627         }
 628
 629         sock_orphan(sk);
 630 out:
 631         return 0;
 632 }
 633
 634 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 635 {
 636         struct sock *sk = sock->sk;
 637         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 638
 639         if (!sock_flag(sk, SOCK_ZAPPED) ||
 640             addr_len != sizeof(struct sockaddr_x25) ||
 641             addr->sx25_family != AF_X25)
 642                 return -EINVAL;
 643
 644         x25_sk(sk)->source_addr = addr->sx25_addr;
 645         x25_insert_socket(sk);
 646         sock_reset_flag(sk, SOCK_ZAPPED);
 647         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 648
 649         return 0;
 650 }
 651
 652 static int x25_wait_for_connection_establishment(struct sock *sk)
 653 {
 654         DECLARE_WAITQUEUE(wait, current);
 655         int rc;
 656
 657         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 658         for (;;) {
 659                 __set_current_state(TASK_INTERRUPTIBLE);
 660                 rc = -ERESTARTSYS;
 661                 if (signal_pending(current))
 662                         break;
 663                 rc = sock_error(sk);
 664                 if (rc) {
 665                         sk->sk_socket->state = SS_UNCONNECTED;
 666                         break;
 667                 }
 668                 rc = 0;
 669                 if (sk->sk_state != TCP_ESTABLISHED) {
 670                         release_sock(sk);
 671                         schedule();
 672                         lock_sock(sk);
 673                 } else
 674                         break;
 675         }
 676         __set_current_state(TASK_RUNNING);
 677         remove_wait_queue(sk->sk_sleep, &wait);
 678         return rc;
 679 }
 680
 681 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 682                        int addr_len, int flags)
 683 {
 684         struct sock *sk = sock->sk;
 685         struct x25_sock *x25 = x25_sk(sk);
 686         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 687         struct x25_route *rt;
 688         int rc = 0;
 689
 690         lock_sock(sk);
 691         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 692                 sock->state = SS_CONNECTED;
 693                 goto out; /* Connect completed during a ERESTARTSYS event */
 694         }
 695
 696         rc = -ECONNREFUSED;
 697         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 698                 sock->state = SS_UNCONNECTED;
 699                 goto out;
 700         }
 701
 702         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 703         if (sk->sk_state == TCP_ESTABLISHED)
 704                 goto out;
 705
 706         sk->sk_state   = TCP_CLOSE;
 707         sock->state = SS_UNCONNECTED;
 708
 709         rc = -EINVAL;
 710         if (addr_len != sizeof(struct sockaddr_x25) ||
 711             addr->sx25_family != AF_X25)
 712                 goto out;
 713
 714         rc = -ENETUNREACH;
 715         rt = x25_get_route(&addr->sx25_addr);
 716         if (!rt)
 717                 goto out;
 718
 719         x25->neighbour = x25_get_neigh(rt->dev);
 720         if (!x25->neighbour)
 721                 goto out_put_route;
 722
 723         x25_limit_facilities(&x25->facilities, x25->neighbour);
 724
 725         x25->lci = x25_new_lci(x25->neighbour);
 726         if (!x25->lci)
 727                 goto out_put_neigh;
 728
 729         rc = -EINVAL;
 730         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 731                 goto out_put_neigh;
 732
 733         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 734                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 735
 736         x25->dest_addr = addr->sx25_addr;
 737
 738         /* Move to connecting socket, start sending Connect Requests */
 739         sock->state   = SS_CONNECTING;
 740         sk->sk_state  = TCP_SYN_SENT;
 741
 742         x25->state = X25_STATE_1;
 743
 744         x25_write_internal(sk, X25_CALL_REQUEST);
 745
 746         x25_start_heartbeat(sk);
 747         x25_start_t21timer(sk);
 748
 749         /* Now the loop */
 750         rc = -EINPROGRESS;
 751         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 752                 goto out_put_neigh;
 753
 754         rc = x25_wait_for_connection_establishment(sk);
 755         if (rc)
 756                 goto out_put_neigh;
 757
 758         sock->state = SS_CONNECTED;
 759         rc = 0;
 760 out_put_neigh:
 761         if (rc)
 762                 x25_neigh_put(x25->neighbour);
 763 out_put_route:
 764         x25_route_put(rt);
 765 out:
 766         release_sock(sk);
 767         return rc;
 768 }
 769
 770 static int x25_wait_for_data(struct sock *sk, long timeout)
 771 {
 772         DECLARE_WAITQUEUE(wait, current);
 773         int rc = 0;
 774
 775         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 776         for (;;) {
 777                 __set_current_state(TASK_INTERRUPTIBLE);
 778                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 779                         break;
 780                 rc = -ERESTARTSYS;
 781                 if (signal_pending(current))
 782                         break;
 783                 rc = -EAGAIN;
 784                 if (!timeout)
 785                         break;
 786                 rc = 0;
 787                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 788                         release_sock(sk);
 789                         timeout = schedule_timeout(timeout);
 790                         lock_sock(sk);
 791                 } else
 792                         break;
 793         }
 794         __set_current_state(TASK_RUNNING);
 795         remove_wait_queue(sk->sk_sleep, &wait);
 796         return rc;
 797 }
 798
 799 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 800 {
 801         struct sock *sk = sock->sk;
 802         struct sock *newsk;
 803         struct sk_buff *skb;
 804         int rc = -EINVAL;
 805
 806         if (!sk || sk->sk_state != TCP_LISTEN)
 807                 goto out;
 808
 809         rc = -EOPNOTSUPP;
 810         if (sk->sk_type != SOCK_SEQPACKET)
 811                 goto out;
 812
 813         lock_sock(sk);
 814         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 815         if (rc)
 816                 goto out2;
 817         skb = skb_dequeue(&sk->sk_receive_queue);
 818         rc = -EINVAL;
 819         if (!skb->sk)
 820                 goto out2;
 821         newsk            = skb->sk;
 822         sock_graft(newsk, newsock);
 823
 824         /* Now attach up the new socket */
 825         skb->sk = NULL;
 826         kfree_skb(skb);
 827         sk->sk_ack_backlog--;
 828         newsock->state = SS_CONNECTED;
 829         rc = 0;
 830 out2:
 831         release_sock(sk);
 832 out:
 833         return rc;
 834 }
 835
 836 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 837                        int *uaddr_len, int peer)
 838 {
 839         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 840         struct sock *sk = sock->sk;
 841         struct x25_sock *x25 = x25_sk(sk);
 842
 843         if (peer) {
 844                 if (sk->sk_state != TCP_ESTABLISHED)
 845                         return -ENOTCONN;
 846                 sx25->sx25_addr = x25->dest_addr;
 847         } else
 848                 sx25->sx25_addr = x25->source_addr;
 849
 850         sx25->sx25_family = AF_X25;
 851         *uaddr_len = sizeof(*sx25);
 852
 853         return 0;
 854 }
 855
 856 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 857                         unsigned int lci)
 858 {
 859         struct sock *sk;
 860         struct sock *make;
 861         struct x25_sock *makex25;
 862         struct x25_address source_addr, dest_addr;
 863         struct x25_facilities facilities;
 864         struct x25_dte_facilities dte_facilities;
 865         int len, addr_len, rc;
 866
 867         /*
 868          *      Remove the LCI and frame type.
 869          */
 870         skb_pull(skb, X25_STD_MIN_LEN);
 871
 872         /*
 873          *      Extract the X.25 addresses and convert them to ASCII strings,
 874          *      and remove them.
 875          */
 876         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 877         skb_pull(skb, addr_len);
 878
 879         /*
 880          *      Get the length of the facilities, skip past them for the moment
 881          *      get the call user data because this is needed to determine
 882          *      the correct listener
 883          */
 884         len = skb->data[0] + 1;
 885         skb_pull(skb,len);
 886
 887         /*
 888          *      Find a listener for the particular address/cud pair.
 889          */
 890         sk = x25_find_listener(&source_addr,skb);
 891         skb_push(skb,len);
 892
 893         if (sk != NULL && sk_acceptq_is_full(sk)) {
 894                 goto out_sock_put;
 895         }
 896
 897         /*
 898          *      We dont have any listeners for this incoming call.
 899          *      Try forwarding it.
 900          */
 901         if (sk == NULL) {
 902                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 903                 if (sysctl_x25_forward &&
 904                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 905                 {
 906                         /* Call was forwarded, dont process it any more */
 907                         kfree_skb(skb);
 908                         rc = 1;
 909                         goto out;
 910                 } else {
 911                         /* No listeners, can't forward, clear the call */
 912                         goto out_clear_request;
 913                 }
 914         }
 915
 916         /*
 917          *      Try to reach a compromise on the requested facilities.
 918          */
 919         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 920         if (len == -1)
 921                 goto out_sock_put;
 922
 923         /*
 924          * current neighbour/link might impose additional limits
 925          * on certain facilties
 926          */
 927
 928         x25_limit_facilities(&facilities, nb);
 929
 930         /*
 931          *      Try to create a new socket.
 932          */
 933         make = x25_make_new(sk);
 934         if (!make)
 935                 goto out_sock_put;
 936
 937         /*
 938          *      Remove the facilities
 939          */
 940         skb_pull(skb, len);
 941
 942         skb->sk     = make;
 943         make->sk_state = TCP_ESTABLISHED;
 944
 945         makex25 = x25_sk(make);
 946         makex25->lci           = lci;
 947         makex25->dest_addr     = dest_addr;
 948         makex25->source_addr   = source_addr;
 949         makex25->neighbour     = nb;
 950         makex25->facilities    = facilities;
 951         makex25->dte_facilities= dte_facilities;
 952         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 953         /* ensure no reverse facil on accept */
 954         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 955         /* ensure no calling address extension on accept */
 956         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 957         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 958
 959         /* Normally all calls are accepted immediatly */
 960         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 961                 x25_write_internal(make, X25_CALL_ACCEPTED);
 962                 makex25->state = X25_STATE_3;
 963         }
 964
 965         /*
 966          *      Incoming Call User Data.
 967          */
 968         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
 969         makex25->calluserdata.cudlength = skb->len;
 970
 971         sk->sk_ack_backlog++;
 972
 973         x25_insert_socket(make);
 974
 975         skb_queue_head(&sk->sk_receive_queue, skb);
 976
 977         x25_start_heartbeat(make);
 978
 979         if (!sock_flag(sk, SOCK_DEAD))
 980                 sk->sk_data_ready(sk, skb->len);
 981         rc = 1;
 982         sock_put(sk);
 983 out:
 984         return rc;
 985 out_sock_put:
 986         sock_put(sk);
 987 out_clear_request:
 988         rc = 0;
 989         x25_transmit_clear_request(nb, lci, 0x01);
 990         goto out;
 991 }
 992
 993 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 994                        struct msghdr *msg, size_t len)
 995 {
 996         struct sock *sk = sock->sk;
 997         struct x25_sock *x25 = x25_sk(sk);
 998         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 999         struct sockaddr_x25 sx25;
1000         struct sk_buff *skb;
1001         unsigned char *asmptr;
1002         int noblock = msg->msg_flags & MSG_DONTWAIT;
1003         size_t size;
1004         int qbit = 0, rc = -EINVAL;
1005
1006         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1007                 goto out;
1008
1009         /* we currently don't support segmented records at the user interface */
1010         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1011                 goto out;
1012
1013         rc = -EADDRNOTAVAIL;
1014         if (sock_flag(sk, SOCK_ZAPPED))
1015                 goto out;
1016
1017         rc = -EPIPE;
1018         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1019                 send_sig(SIGPIPE, current, 0);
1020                 goto out;
1021         }
1022
1023         rc = -ENETUNREACH;
1024         if (!x25->neighbour)
1025                 goto out;
1026
1027         if (usx25) {
1028                 rc = -EINVAL;
1029                 if (msg->msg_namelen < sizeof(sx25))
1030                         goto out;
1031                 memcpy(&sx25, usx25, sizeof(sx25));
1032                 rc = -EISCONN;
1033                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1034                         goto out;
1035                 rc = -EINVAL;
1036                 if (sx25.sx25_family != AF_X25)
1037                         goto out;
1038         } else {
1039                 /*
1040                  *      FIXME 1003.1g - if the socket is like this because
1041                  *      it has become closed (not started closed) we ought
1042                  *      to SIGPIPE, EPIPE;
1043                  */
1044                 rc = -ENOTCONN;
1045                 if (sk->sk_state != TCP_ESTABLISHED)
1046                         goto out;
1047
1048                 sx25.sx25_family = AF_X25;
1049                 sx25.sx25_addr   = x25->dest_addr;
1050         }
1051
1052         /* Sanity check the packet size */
1053         if (len > 65535) {
1054                 rc = -EMSGSIZE;
1055                 goto out;
1056         }
1057
1058         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1059
1060         /* Build a packet */
1061         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1062
1063         if ((msg->msg_flags & MSG_OOB) && len > 32)
1064                 len = 32;
1065
1066         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1067
1068         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1069         if (!skb)
1070                 goto out;
1071         X25_SKB_CB(skb)->flags = msg->msg_flags;
1072
1073         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1074
1075         /*
1076          *      Put the data on the end
1077          */
1078         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1079
1080         skb_reset_transport_header(skb);
1081         skb_put(skb, len);
1082
1083         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1084         if (rc)
1085                 goto out_kfree_skb;
1086
1087         /*
1088          *      If the Q BIT Include socket option is in force, the first
1089          *      byte of the user data is the logical value of the Q Bit.
1090          */
1091         if (x25->qbitincl) {
1092                 qbit = skb->data[0];
1093                 skb_pull(skb, 1);
1094         }
1095
1096         /*
1097          *      Push down the X.25 header
1098          */
1099         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1100
1101         if (msg->msg_flags & MSG_OOB) {
1102                 if (x25->neighbour->extended) {
1103                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1104                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1105                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1106                         *asmptr++ = X25_INTERRUPT;
1107                 } else {
1108                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1109                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1110                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1111                         *asmptr++ = X25_INTERRUPT;
1112                 }
1113         } else {
1114                 if (x25->neighbour->extended) {
1115                         /* Build an Extended X.25 header */
1116                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1117                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1118                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1119                         *asmptr++ = X25_DATA;
1120                         *asmptr++ = X25_DATA;
1121                 } else {
1122                         /* Build an Standard X.25 header */
1123                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1124                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1125                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1126                         *asmptr++ = X25_DATA;
1127                 }
1128
1129                 if (qbit)
1130                         skb->data[0] |= X25_Q_BIT;
1131         }
1132
1133         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1134         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1135
1136         rc = -ENOTCONN;
1137         if (sk->sk_state != TCP_ESTABLISHED)
1138                 goto out_kfree_skb;
1139
1140         if (msg->msg_flags & MSG_OOB)
1141                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1142         else {
1143                 rc = x25_output(sk, skb);
1144                 len = rc;
1145                 if (rc < 0)
1146                         kfree_skb(skb);
1147                 else if (x25->qbitincl)
1148                         len++;
1149         }
1150
1151         /*
1152          * lock_sock() is currently only used to serialize this x25_kick()
1153          * against input-driven x25_kick() calls. It currently only blocks
1154          * incoming packets for this socket and does not protect against
1155          * any other socket state changes and is not called from anywhere
1156          * else. As x25_kick() cannot block and as long as all socket
1157          * operations are BKL-wrapped, we don't need take to care about
1158          * purging the backlog queue in x25_release().
1159          *
1160          * Using lock_sock() to protect all socket operations entirely
1161          * (and making the whole x25 stack SMP aware) unfortunately would
1162          * require major changes to {send,recv}msg and skb allocation methods.
1163          * -> 2.5 ;)
1164          */
1165         lock_sock(sk);
1166         x25_kick(sk);
1167         release_sock(sk);
1168         rc = len;
1169 out:
1170         return rc;
1171 out_kfree_skb:
1172         kfree_skb(skb);
1173         goto out;
1174 }
1175
1176
1177 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1178                        struct msghdr *msg, size_t size,
1179                        int flags)
1180 {
1181         struct sock *sk = sock->sk;
1182         struct x25_sock *x25 = x25_sk(sk);
1183         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1184         size_t copied;
1185         int qbit;
1186         struct sk_buff *skb;
1187         unsigned char *asmptr;
1188         int rc = -ENOTCONN;
1189
1190         /*
1191          * This works for seqpacket too. The receiver has ordered the queue for
1192          * us! We do one quick check first though
1193          */
1194         if (sk->sk_state != TCP_ESTABLISHED)
1195                 goto out;
1196
1197         if (flags & MSG_OOB) {
1198                 rc = -EINVAL;
1199                 if (sock_flag(sk, SOCK_URGINLINE) ||
1200                     !skb_peek(&x25->interrupt_in_queue))
1201                         goto out;
1202
1203                 skb = skb_dequeue(&x25->interrupt_in_queue);
1204
1205                 skb_pull(skb, X25_STD_MIN_LEN);
1206
1207                 /*
1208                  *      No Q bit information on Interrupt data.
1209                  */
1210                 if (x25->qbitincl) {
1211                         asmptr  = skb_push(skb, 1);
1212                         *asmptr = 0x00;
1213                 }
1214
1215                 msg->msg_flags |= MSG_OOB;
1216         } else {
1217                 /* Now we can treat all alike */
1218                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1219                                         flags & MSG_DONTWAIT, &rc);
1220                 if (!skb)
1221                         goto out;
1222
1223                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1224
1225                 skb_pull(skb, x25->neighbour->extended ?
1226                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1227
1228                 if (x25->qbitincl) {
1229                         asmptr  = skb_push(skb, 1);
1230                         *asmptr = qbit;
1231                 }
1232         }
1233
1234         skb_reset_transport_header(skb);
1235         copied = skb->len;
1236
1237         if (copied > size) {
1238                 copied = size;
1239                 msg->msg_flags |= MSG_TRUNC;
1240         }
1241
1242         /* Currently, each datagram always contains a complete record */
1243         msg->msg_flags |= MSG_EOR;
1244
1245         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1246         if (rc)
1247                 goto out_free_dgram;
1248
1249         if (sx25) {
1250                 sx25->sx25_family = AF_X25;
1251                 sx25->sx25_addr   = x25->dest_addr;
1252         }
1253
1254         msg->msg_namelen = sizeof(struct sockaddr_x25);
1255
1256         lock_sock(sk);
1257         x25_check_rbuf(sk);
1258         release_sock(sk);
1259         rc = copied;
1260 out_free_dgram:
1261         skb_free_datagram(sk, skb);
1262 out:
1263         return rc;
1264 }
1265
1266
1267 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1268 {
1269         struct sock *sk = sock->sk;
1270         struct x25_sock *x25 = x25_sk(sk);
1271         void __user *argp = (void __user *)arg;
1272         int rc;
1273
1274         switch (cmd) {
1275                 case TIOCOUTQ: {
1276                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1277
1278                         if (amount < 0)
1279                                 amount = 0;
1280                         rc = put_user(amount, (unsigned int __user *)argp);
1281                         break;
1282                 }
1283
1284                 case TIOCINQ: {
1285                         struct sk_buff *skb;
1286                         int amount = 0;
1287                         /*
1288                          * These two are safe on a single CPU system as
1289                          * only user tasks fiddle here
1290                          */
1291                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1292                                 amount = skb->len;
1293                         rc = put_user(amount, (unsigned int __user *)argp);
1294                         break;
1295                 }
1296
1297                 case SIOCGSTAMP:
1298                         rc = -EINVAL;
1299                         if (sk)
1300                                 rc = sock_get_timestamp(sk,
1301                                                 (struct timeval __user *)argp);
1302                         break;
1303                 case SIOCGSTAMPNS:
1304                         rc = -EINVAL;
1305                         if (sk)
1306                                 rc = sock_get_timestampns(sk,
1307                                                 (struct timespec __user *)argp);
1308                         break;
1309                 case SIOCGIFADDR:
1310                 case SIOCSIFADDR:
1311                 case SIOCGIFDSTADDR:
1312                 case SIOCSIFDSTADDR:
1313                 case SIOCGIFBRDADDR:
1314                 case SIOCSIFBRDADDR:
1315                 case SIOCGIFNETMASK:
1316                 case SIOCSIFNETMASK:
1317                 case SIOCGIFMETRIC:
1318                 case SIOCSIFMETRIC:
1319                         rc = -EINVAL;
1320                         break;
1321                 case SIOCADDRT:
1322                 case SIOCDELRT:
1323                         rc = -EPERM;
1324                         if (!capable(CAP_NET_ADMIN))
1325                                 break;
1326                         rc = x25_route_ioctl(cmd, argp);
1327                         break;
1328                 case SIOCX25GSUBSCRIP:
1329                         rc = x25_subscr_ioctl(cmd, argp);
1330                         break;
1331                 case SIOCX25SSUBSCRIP:
1332                         rc = -EPERM;
1333                         if (!capable(CAP_NET_ADMIN))
1334                                 break;
1335                         rc = x25_subscr_ioctl(cmd, argp);
1336                         break;
1337                 case SIOCX25GFACILITIES: {
1338                         struct x25_facilities fac = x25->facilities;
1339                         rc = copy_to_user(argp, &fac,
1340                                           sizeof(fac)) ? -EFAULT : 0;
1341                         break;
1342                 }
1343
1344                 case SIOCX25SFACILITIES: {
1345                         struct x25_facilities facilities;
1346                         rc = -EFAULT;
1347                         if (copy_from_user(&facilities, argp,
1348                                            sizeof(facilities)))
1349                                 break;
1350                         rc = -EINVAL;
1351                         if (sk->sk_state != TCP_LISTEN &&
1352                             sk->sk_state != TCP_CLOSE)
1353                                 break;
1354                         if (facilities.pacsize_in < X25_PS16 ||
1355                             facilities.pacsize_in > X25_PS4096)
1356                                 break;
1357                         if (facilities.pacsize_out < X25_PS16 ||
1358                             facilities.pacsize_out > X25_PS4096)
1359                                 break;
1360                         if (facilities.winsize_in < 1 ||
1361                             facilities.winsize_in > 127)
1362                                 break;
1363                         if (facilities.throughput < 0x03 ||
1364                             facilities.throughput > 0xDD)
1365                                 break;
1366                         if (facilities.reverse &&
1367                                 (facilities.reverse & 0x81) != 0x81)
1368                                 break;
1369                         x25->facilities = facilities;
1370                         rc = 0;
1371                         break;
1372                 }
1373
1374                 case SIOCX25GDTEFACILITIES: {
1375                         rc = copy_to_user(argp, &x25->dte_facilities,
1376                                                 sizeof(x25->dte_facilities));
1377                         if (rc)
1378                                 rc = -EFAULT;
1379                         break;
1380                 }
1381
1382                 case SIOCX25SDTEFACILITIES: {
1383                         struct x25_dte_facilities dtefacs;
1384                         rc = -EFAULT;
1385                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1386                                 break;
1387                         rc = -EINVAL;
1388                         if (sk->sk_state != TCP_LISTEN &&
1389                                         sk->sk_state != TCP_CLOSE)
1390                                 break;
1391                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1392                                 break;
1393                         if (dtefacs.calling_ae == NULL)
1394                                 break;
1395                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1396                                 break;
1397                         if (dtefacs.called_ae == NULL)
1398                                 break;
1399                         x25->dte_facilities = dtefacs;
1400                         rc = 0;
1401                         break;
1402                 }
1403
1404                 case SIOCX25GCALLUSERDATA: {
1405                         struct x25_calluserdata cud = x25->calluserdata;
1406                         rc = copy_to_user(argp, &cud,
1407                                           sizeof(cud)) ? -EFAULT : 0;
1408                         break;
1409                 }
1410
1411                 case SIOCX25SCALLUSERDATA: {
1412                         struct x25_calluserdata calluserdata;
1413
1414                         rc = -EFAULT;
1415                         if (copy_from_user(&calluserdata, argp,
1416                                            sizeof(calluserdata)))
1417                                 break;
1418                         rc = -EINVAL;
1419                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1420                                 break;
1421                         x25->calluserdata = calluserdata;
1422                         rc = 0;
1423                         break;
1424                 }
1425
1426                 case SIOCX25GCAUSEDIAG: {
1427                         struct x25_causediag causediag;
1428                         causediag = x25->causediag;
1429                         rc = copy_to_user(argp, &causediag,
1430                                           sizeof(causediag)) ? -EFAULT : 0;
1431                         break;
1432                 }
1433
1434                 case SIOCX25SCUDMATCHLEN: {
1435                         struct x25_subaddr sub_addr;
1436                         rc = -EINVAL;
1437                         if(sk->sk_state != TCP_CLOSE)
1438                                 break;
1439                         rc = -EFAULT;
1440                         if (copy_from_user(&sub_addr, argp,
1441                                         sizeof(sub_addr)))
1442                                 break;
1443                         rc = -EINVAL;
1444                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1445                                 break;
1446                         x25->cudmatchlength = sub_addr.cudmatchlength;
1447                         rc = 0;
1448                         break;
1449                 }
1450
1451                 case SIOCX25CALLACCPTAPPRV: {
1452                         rc = -EINVAL;
1453                         if (sk->sk_state != TCP_CLOSE)
1454                                 break;
1455                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1456                         rc = 0;
1457                         break;
1458                 }
1459
1460                 case SIOCX25SENDCALLACCPT:  {
1461                         rc = -EINVAL;
1462                         if (sk->sk_state != TCP_ESTABLISHED)
1463                                 break;
1464                         if (x25->accptapprv)    /* must call accptapprv above */
1465                                 break;
1466                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1467                         x25->state = X25_STATE_3;
1468                         rc = 0;
1469                         break;
1470                 }
1471
1472                 default:
1473                         rc = -ENOIOCTLCMD;
1474                         break;
1475         }
1476
1477         return rc;
1478 }
1479
1480 static const struct net_proto_family x25_family_ops = {
1481         .family =       AF_X25,
1482         .create =       x25_create,
1483         .owner  =       THIS_MODULE,
1484 };
1485
1486 #ifdef CONFIG_COMPAT
1487 static int compat_x25_subscr_ioctl(unsigned int cmd,
1488                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1489 {
1490         struct compat_x25_subscrip_struct x25_subscr;
1491         struct x25_neigh *nb;
1492         struct net_device *dev;
1493         int rc = -EINVAL;
1494
1495         rc = -EFAULT;
1496         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1497                 goto out;
1498
1499         rc = -EINVAL;
1500         dev = x25_dev_get(x25_subscr.device);
1501         if (dev == NULL)
1502                 goto out;
1503
1504         nb = x25_get_neigh(dev);
1505         if (nb == NULL)
1506                 goto out_dev_put;
1507
1508         dev_put(dev);
1509
1510         if (cmd == SIOCX25GSUBSCRIP) {
1511                 x25_subscr.extended = nb->extended;
1512                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1513                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1514                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1515         } else {
1516                 rc = -EINVAL;
1517                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1518                         rc = 0;
1519                         nb->extended = x25_subscr.extended;
1520                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1521                 }
1522         }
1523         x25_neigh_put(nb);
1524 out:
1525         return rc;
1526 out_dev_put:
1527         dev_put(dev);
1528         goto out;
1529 }
1530
1531 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1532                                 unsigned long arg)
1533 {
1534         void __user *argp = compat_ptr(arg);
1535         struct sock *sk = sock->sk;
1536
1537         int rc = -ENOIOCTLCMD;
1538
1539         switch(cmd) {
1540         case TIOCOUTQ:
1541         case TIOCINQ:
1542                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1543                 break;
1544         case SIOCGSTAMP:
1545                 rc = -EINVAL;
1546                 if (sk)
1547                         rc = compat_sock_get_timestamp(sk,
1548                                         (struct timeval __user*)argp);
1549                 break;
1550         case SIOCGSTAMPNS:
1551                 rc = -EINVAL;
1552                 if (sk)
1553                         rc = compat_sock_get_timestampns(sk,
1554                                         (struct timespec __user*)argp);
1555                 break;
1556         case SIOCGIFADDR:
1557         case SIOCSIFADDR:
1558         case SIOCGIFDSTADDR:
1559         case SIOCSIFDSTADDR:
1560         case SIOCGIFBRDADDR:
1561         case SIOCSIFBRDADDR:
1562         case SIOCGIFNETMASK:
1563         case SIOCSIFNETMASK:
1564         case SIOCGIFMETRIC:
1565         case SIOCSIFMETRIC:
1566                 rc = -EINVAL;
1567                 break;
1568         case SIOCADDRT:
1569         case SIOCDELRT:
1570                 rc = -EPERM;
1571                 if (!capable(CAP_NET_ADMIN))
1572                         break;
1573                 rc = x25_route_ioctl(cmd, argp);
1574                 break;
1575         case SIOCX25GSUBSCRIP:
1576                 rc = compat_x25_subscr_ioctl(cmd, argp);
1577                 break;
1578         case SIOCX25SSUBSCRIP:
1579                 rc = -EPERM;
1580                 if (!capable(CAP_NET_ADMIN))
1581                         break;
1582                 rc = compat_x25_subscr_ioctl(cmd, argp);
1583                 break;
1584         case SIOCX25GFACILITIES:
1585         case SIOCX25SFACILITIES:
1586         case SIOCX25GDTEFACILITIES:
1587         case SIOCX25SDTEFACILITIES:
1588         case SIOCX25GCALLUSERDATA:
1589         case SIOCX25SCALLUSERDATA:
1590         case SIOCX25GCAUSEDIAG:
1591         case SIOCX25SCUDMATCHLEN:
1592         case SIOCX25CALLACCPTAPPRV:
1593         case SIOCX25SENDCALLACCPT:
1594                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1595                 break;
1596         default:
1597                 rc = -ENOIOCTLCMD;
1598                 break;
1599         }
1600         return rc;
1601 }
1602 #endif
1603
1604 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1605         .family =       AF_X25,
1606         .owner =        THIS_MODULE,
1607         .release =      x25_release,
1608         .bind =         x25_bind,
1609         .connect =      x25_connect,
1610         .socketpair =   sock_no_socketpair,
1611         .accept =       x25_accept,
1612         .getname =      x25_getname,
1613         .poll =         datagram_poll,
1614         .ioctl =        x25_ioctl,
1615 #ifdef CONFIG_COMPAT
1616         .compat_ioctl = compat_x25_ioctl,
1617 #endif
1618         .listen =       x25_listen,
1619         .shutdown =     sock_no_shutdown,
1620         .setsockopt =   x25_setsockopt,
1621         .getsockopt =   x25_getsockopt,
1622         .sendmsg =      x25_sendmsg,
1623         .recvmsg =      x25_recvmsg,
1624         .mmap =         sock_no_mmap,
1625         .sendpage =     sock_no_sendpage,
1626 };
1627
1628 SOCKOPS_WRAP(x25_proto, AF_X25);
1629
1630 static struct packet_type x25_packet_type __read_mostly = {
1631         .type = cpu_to_be16(ETH_P_X25),
1632         .func = x25_lapb_receive_frame,
1633 };
1634
1635 static struct notifier_block x25_dev_notifier = {
1636         .notifier_call = x25_device_event,
1637 };
1638
1639 void x25_kill_by_neigh(struct x25_neigh *nb)
1640 {
1641         struct sock *s;
1642         struct hlist_node *node;
1643
1644         write_lock_bh(&x25_list_lock);
1645
1646         sk_for_each(s, node, &x25_list)
1647                 if (x25_sk(s)->neighbour == nb)
1648                         x25_disconnect(s, ENETUNREACH, 0, 0);
1649
1650         write_unlock_bh(&x25_list_lock);
1651
1652         /* Remove any related forwards */
1653         x25_clear_forward_by_dev(nb->dev);
1654 }
1655
1656 static int __init x25_init(void)
1657 {
1658         int rc = proto_register(&x25_proto, 0);
1659
1660         if (rc != 0)
1661                 goto out;
1662
1663         sock_register(&x25_family_ops);
1664
1665         dev_add_pack(&x25_packet_type);
1666
1667         register_netdevice_notifier(&x25_dev_notifier);
1668
1669         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1670
1671 #ifdef CONFIG_SYSCTL
1672         x25_register_sysctl();
1673 #endif
1674         x25_proc_init();
1675 out:
1676         return rc;
1677 }
1678 module_init(x25_init);
1679
1680 static void __exit x25_exit(void)
1681 {
1682         x25_proc_exit();
1683         x25_link_free();
1684         x25_route_free();
1685
1686 #ifdef CONFIG_SYSCTL
1687         x25_unregister_sysctl();
1688 #endif
1689
1690         unregister_netdevice_notifier(&x25_dev_notifier);
1691
1692         dev_remove_pack(&x25_packet_type);
1693
1694         sock_unregister(AF_X25);
1695         proto_unregister(&x25_proto);
1696 }
1697 module_exit(x25_exit);
1698
1699 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1700 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1701 MODULE_LICENSE("GPL");
1702 MODULE_ALIAS_NETPROTO(PF_X25);