net/x25/af_x25.c

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/capability.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/timer.h>
  44 #include <linux/string.h>
  45 #include <linux/net.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <net/sock.h>
  50 #include <net/tcp_states.h>
  51 #include <asm/uaccess.h>
  52 #include <linux/fcntl.h>
  53 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  54 #include <linux/notifier.h>
  55 #include <linux/init.h>
  56 #include <linux/compat.h>
  57
  58 #include <net/x25.h>
  59 #include <net/compat.h>
  60
  61 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  62 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  63 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  64 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  65 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  66 int sysctl_x25_forward                 = 0;
  67
  68 HLIST_HEAD(x25_list);
  69 DEFINE_RWLOCK(x25_list_lock);
  70
  71 static const struct proto_ops x25_proto_ops;
  72
  73 static struct x25_address null_x25_address = {"               "};
  74
  75 #ifdef CONFIG_COMPAT
  76 struct compat_x25_subscrip_struct {
  77         char device[200-sizeof(compat_ulong_t)];
  78         compat_ulong_t global_facil_mask;
  79         compat_uint_t extended;
  80 };
  81 #endif
  82
  83 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
  84                   struct x25_address *calling_addr)
  85 {
  86         unsigned int called_len, calling_len;
  87         char *called, *calling;
  88         unsigned int i;
  89
  90         called_len  = (*p >> 0) & 0x0F;
  91         calling_len = (*p >> 4) & 0x0F;
  92
  93         called  = called_addr->x25_addr;
  94         calling = calling_addr->x25_addr;
  95         p++;
  96
  97         for (i = 0; i < (called_len + calling_len); i++) {
  98                 if (i < called_len) {
  99                         if (i % 2 != 0) {
 100                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 101                                 p++;
 102                         } else {
 103                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 104                         }
 105                 } else {
 106                         if (i % 2 != 0) {
 107                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 108                                 p++;
 109                         } else {
 110                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 111                         }
 112                 }
 113         }
 114
 115         *called = *calling = '\0';
 116
 117         return 1 + (called_len + calling_len + 1) / 2;
 118 }
 119
 120 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 121                   struct x25_address *calling_addr)
 122 {
 123         unsigned int called_len, calling_len;
 124         char *called, *calling;
 125         int i;
 126
 127         called  = called_addr->x25_addr;
 128         calling = calling_addr->x25_addr;
 129
 130         called_len  = strlen(called);
 131         calling_len = strlen(calling);
 132
 133         *p++ = (calling_len << 4) | (called_len << 0);
 134
 135         for (i = 0; i < (called_len + calling_len); i++) {
 136                 if (i < called_len) {
 137                         if (i % 2 != 0) {
 138                                 *p |= (*called++ - '0') << 0;
 139                                 p++;
 140                         } else {
 141                                 *p = 0x00;
 142                                 *p |= (*called++ - '0') << 4;
 143                         }
 144                 } else {
 145                         if (i % 2 != 0) {
 146                                 *p |= (*calling++ - '0') << 0;
 147                                 p++;
 148                         } else {
 149                                 *p = 0x00;
 150                                 *p |= (*calling++ - '0') << 4;
 151                         }
 152                 }
 153         }
 154
 155         return 1 + (called_len + calling_len + 1) / 2;
 156 }
 157
 158 /*
 159  *      Socket removal during an interrupt is now safe.
 160  */
 161 static void x25_remove_socket(struct sock *sk)
 162 {
 163         write_lock_bh(&x25_list_lock);
 164         sk_del_node_init(sk);
 165         write_unlock_bh(&x25_list_lock);
 166 }
 167
 168 /*
 169  *      Kill all bound sockets on a dropped device.
 170  */
 171 static void x25_kill_by_device(struct net_device *dev)
 172 {
 173         struct sock *s;
 174         struct hlist_node *node;
 175
 176         write_lock_bh(&x25_list_lock);
 177
 178         sk_for_each(s, node, &x25_list)
 179                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 180                         x25_disconnect(s, ENETUNREACH, 0, 0);
 181
 182         write_unlock_bh(&x25_list_lock);
 183 }
 184
 185 /*
 186  *      Handle device status changes.
 187  */
 188 static int x25_device_event(struct notifier_block *this, unsigned long event,
 189                             void *ptr)
 190 {
 191         struct net_device *dev = ptr;
 192         struct x25_neigh *nb;
 193
 194         if (!net_eq(dev_net(dev), &init_net))
 195                 return NOTIFY_DONE;
 196
 197         if (dev->type == ARPHRD_X25
 198 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 199          || dev->type == ARPHRD_ETHER
 200 #endif
 201          ) {
 202                 switch (event) {
 203                         case NETDEV_UP:
 204                                 x25_link_device_up(dev);
 205                                 break;
 206                         case NETDEV_GOING_DOWN:
 207                                 nb = x25_get_neigh(dev);
 208                                 if (nb) {
 209                                         x25_terminate_link(nb);
 210                                         x25_neigh_put(nb);
 211                                 }
 212                                 break;
 213                         case NETDEV_DOWN:
 214                                 x25_kill_by_device(dev);
 215                                 x25_route_device_down(dev);
 216                                 x25_link_device_down(dev);
 217                                 break;
 218                 }
 219         }
 220
 221         return NOTIFY_DONE;
 222 }
 223
 224 /*
 225  *      Add a socket to the bound sockets list.
 226  */
 227 static void x25_insert_socket(struct sock *sk)
 228 {
 229         write_lock_bh(&x25_list_lock);
 230         sk_add_node(sk, &x25_list);
 231         write_unlock_bh(&x25_list_lock);
 232 }
 233
 234 /*
 235  *      Find a socket that wants to accept the Call Request we just
 236  *      received. Check the full list for an address/cud match.
 237  *      If no cuds match return the next_best thing, an address match.
 238  *      Note: if a listening socket has cud set it must only get calls
 239  *      with matching cud.
 240  */
 241 static struct sock *x25_find_listener(struct x25_address *addr,
 242                                         struct sk_buff *skb)
 243 {
 244         struct sock *s;
 245         struct sock *next_best;
 246         struct hlist_node *node;
 247
 248         read_lock_bh(&x25_list_lock);
 249         next_best = NULL;
 250
 251         sk_for_each(s, node, &x25_list)
 252                 if ((!strcmp(addr->x25_addr,
 253                         x25_sk(s)->source_addr.x25_addr) ||
 254                                 !strcmp(addr->x25_addr,
 255                                         null_x25_address.x25_addr)) &&
 256                                         s->sk_state == TCP_LISTEN) {
 257                         /*
 258                          * Found a listening socket, now check the incoming
 259                          * call user data vs this sockets call user data
 260                          */
 261                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 262                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 263                                         skb->data,
 264                                         x25_sk(s)->cudmatchlength)) == 0) {
 265                                         sock_hold(s);
 266                                         goto found;
 267                                  }
 268                         } else
 269                                 next_best = s;
 270                 }
 271         if (next_best) {
 272                 s = next_best;
 273                 sock_hold(s);
 274                 goto found;
 275         }
 276         s = NULL;
 277 found:
 278         read_unlock_bh(&x25_list_lock);
 279         return s;
 280 }
 281
 282 /*
 283  *      Find a connected X.25 socket given my LCI and neighbour.
 284  */
 285 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 286 {
 287         struct sock *s;
 288         struct hlist_node *node;
 289
 290         sk_for_each(s, node, &x25_list)
 291                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 292                         sock_hold(s);
 293                         goto found;
 294                 }
 295         s = NULL;
 296 found:
 297         return s;
 298 }
 299
 300 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 301 {
 302         struct sock *s;
 303
 304         read_lock_bh(&x25_list_lock);
 305         s = __x25_find_socket(lci, nb);
 306         read_unlock_bh(&x25_list_lock);
 307         return s;
 308 }
 309
 310 /*
 311  *      Find a unique LCI for a given device.
 312  */
 313 static unsigned int x25_new_lci(struct x25_neigh *nb)
 314 {
 315         unsigned int lci = 1;
 316         struct sock *sk;
 317
 318         read_lock_bh(&x25_list_lock);
 319
 320         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 321                 sock_put(sk);
 322                 if (++lci == 4096) {
 323                         lci = 0;
 324                         break;
 325                 }
 326         }
 327
 328         read_unlock_bh(&x25_list_lock);
 329         return lci;
 330 }
 331
 332 /*
 333  *      Deferred destroy.
 334  */
 335 void x25_destroy_socket(struct sock *);
 336
 337 /*
 338  *      handler for deferred kills.
 339  */
 340 static void x25_destroy_timer(unsigned long data)
 341 {
 342         x25_destroy_socket((struct sock *)data);
 343 }
 344
 345 /*
 346  *      This is called from user mode and the timers. Thus it protects itself
 347  *      against interrupt users but doesn't worry about being called during
 348  *      work. Once it is removed from the queue no interrupt or bottom half
 349  *      will touch it and we are (fairly 8-) ) safe.
 350  *      Not static as it's used by the timer
 351  */
 352 void x25_destroy_socket(struct sock *sk)
 353 {
 354         struct sk_buff *skb;
 355
 356         sock_hold(sk);
 357         lock_sock(sk);
 358         x25_stop_heartbeat(sk);
 359         x25_stop_timer(sk);
 360
 361         x25_remove_socket(sk);
 362         x25_clear_queues(sk);           /* Flush the queues */
 363
 364         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 365                 if (skb->sk != sk) {            /* A pending connection */
 366                         /*
 367                          * Queue the unaccepted socket for death
 368                          */
 369                         sock_set_flag(skb->sk, SOCK_DEAD);
 370                         x25_start_heartbeat(skb->sk);
 371                         x25_sk(skb->sk)->state = X25_STATE_0;
 372                 }
 373
 374                 kfree_skb(skb);
 375         }
 376
 377         if (atomic_read(&sk->sk_wmem_alloc) ||
 378             atomic_read(&sk->sk_rmem_alloc)) {
 379                 /* Defer: outstanding buffers */
 380                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 381                 sk->sk_timer.function = x25_destroy_timer;
 382                 sk->sk_timer.data = (unsigned long)sk;
 383                 add_timer(&sk->sk_timer);
 384         } else {
 385                 /* drop last reference so sock_put will free */
 386                 __sock_put(sk);
 387         }
 388
 389         release_sock(sk);
 390         sock_put(sk);
 391 }
 392
 393 /*
 394  *      Handling for system calls applied via the various interfaces to a
 395  *      X.25 socket object.
 396  */
 397
 398 static int x25_setsockopt(struct socket *sock, int level, int optname,
 399                           char __user *optval, int optlen)
 400 {
 401         int opt;
 402         struct sock *sk = sock->sk;
 403         int rc = -ENOPROTOOPT;
 404
 405         if (level != SOL_X25 || optname != X25_QBITINCL)
 406                 goto out;
 407
 408         rc = -EINVAL;
 409         if (optlen < sizeof(int))
 410                 goto out;
 411
 412         rc = -EFAULT;
 413         if (get_user(opt, (int __user *)optval))
 414                 goto out;
 415
 416         x25_sk(sk)->qbitincl = !!opt;
 417         rc = 0;
 418 out:
 419         return rc;
 420 }
 421
 422 static int x25_getsockopt(struct socket *sock, int level, int optname,
 423                           char __user *optval, int __user *optlen)
 424 {
 425         struct sock *sk = sock->sk;
 426         int val, len, rc = -ENOPROTOOPT;
 427
 428         if (level != SOL_X25 || optname != X25_QBITINCL)
 429                 goto out;
 430
 431         rc = -EFAULT;
 432         if (get_user(len, optlen))
 433                 goto out;
 434
 435         len = min_t(unsigned int, len, sizeof(int));
 436
 437         rc = -EINVAL;
 438         if (len < 0)
 439                 goto out;
 440
 441         rc = -EFAULT;
 442         if (put_user(len, optlen))
 443                 goto out;
 444
 445         val = x25_sk(sk)->qbitincl;
 446         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 447 out:
 448         return rc;
 449 }
 450
 451 static int x25_listen(struct socket *sock, int backlog)
 452 {
 453         struct sock *sk = sock->sk;
 454         int rc = -EOPNOTSUPP;
 455
 456         if (sk->sk_state != TCP_LISTEN) {
 457                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 458                 sk->sk_max_ack_backlog = backlog;
 459                 sk->sk_state           = TCP_LISTEN;
 460                 rc = 0;
 461         }
 462
 463         return rc;
 464 }
 465
 466 static struct proto x25_proto = {
 467         .name     = "X25",
 468         .owner    = THIS_MODULE,
 469         .obj_size = sizeof(struct x25_sock),
 470 };
 471
 472 static struct sock *x25_alloc_socket(struct net *net)
 473 {
 474         struct x25_sock *x25;
 475         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 476
 477         if (!sk)
 478                 goto out;
 479
 480         sock_init_data(NULL, sk);
 481
 482         x25 = x25_sk(sk);
 483         skb_queue_head_init(&x25->ack_queue);
 484         skb_queue_head_init(&x25->fragment_queue);
 485         skb_queue_head_init(&x25->interrupt_in_queue);
 486         skb_queue_head_init(&x25->interrupt_out_queue);
 487 out:
 488         return sk;
 489 }
 490
 491 static int x25_create(struct net *net, struct socket *sock, int protocol)
 492 {
 493         struct sock *sk;
 494         struct x25_sock *x25;
 495         int rc = -ESOCKTNOSUPPORT;
 496
 497         if (net != &init_net)
 498                 return -EAFNOSUPPORT;
 499
 500         if (sock->type != SOCK_SEQPACKET || protocol)
 501                 goto out;
 502
 503         rc = -ENOMEM;
 504         if ((sk = x25_alloc_socket(net)) == NULL)
 505                 goto out;
 506
 507         x25 = x25_sk(sk);
 508
 509         sock_init_data(sock, sk);
 510
 511         x25_init_timers(sk);
 512
 513         sock->ops    = &x25_proto_ops;
 514         sk->sk_protocol = protocol;
 515         sk->sk_backlog_rcv = x25_backlog_rcv;
 516
 517         x25->t21   = sysctl_x25_call_request_timeout;
 518         x25->t22   = sysctl_x25_reset_request_timeout;
 519         x25->t23   = sysctl_x25_clear_request_timeout;
 520         x25->t2    = sysctl_x25_ack_holdback_timeout;
 521         x25->state = X25_STATE_0;
 522         x25->cudmatchlength = 0;
 523         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 524                                                         /* on call accept   */
 525
 526         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 527         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 528         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 529         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 530         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 531         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 532         x25->dte_facilities.calling_len = 0;
 533         x25->dte_facilities.called_len = 0;
 534         memset(x25->dte_facilities.called_ae, '\0',
 535                         sizeof(x25->dte_facilities.called_ae));
 536         memset(x25->dte_facilities.calling_ae, '\0',
 537                         sizeof(x25->dte_facilities.calling_ae));
 538
 539         rc = 0;
 540 out:
 541         return rc;
 542 }
 543
 544 static struct sock *x25_make_new(struct sock *osk)
 545 {
 546         struct sock *sk = NULL;
 547         struct x25_sock *x25, *ox25;
 548
 549         if (osk->sk_type != SOCK_SEQPACKET)
 550                 goto out;
 551
 552         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 553                 goto out;
 554
 555         x25 = x25_sk(sk);
 556
 557         sk->sk_type        = osk->sk_type;
 558         sk->sk_priority    = osk->sk_priority;
 559         sk->sk_protocol    = osk->sk_protocol;
 560         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 561         sk->sk_sndbuf      = osk->sk_sndbuf;
 562         sk->sk_state       = TCP_ESTABLISHED;
 563         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 564         sock_copy_flags(sk, osk);
 565
 566         ox25 = x25_sk(osk);
 567         x25->t21        = ox25->t21;
 568         x25->t22        = ox25->t22;
 569         x25->t23        = ox25->t23;
 570         x25->t2         = ox25->t2;
 571         x25->facilities = ox25->facilities;
 572         x25->qbitincl   = ox25->qbitincl;
 573         x25->dte_facilities = ox25->dte_facilities;
 574         x25->cudmatchlength = ox25->cudmatchlength;
 575         x25->accptapprv = ox25->accptapprv;
 576
 577         x25_init_timers(sk);
 578 out:
 579         return sk;
 580 }
 581
 582 static int x25_release(struct socket *sock)
 583 {
 584         struct sock *sk = sock->sk;
 585         struct x25_sock *x25;
 586
 587         if (!sk)
 588                 goto out;
 589
 590         x25 = x25_sk(sk);
 591
 592         switch (x25->state) {
 593
 594                 case X25_STATE_0:
 595                 case X25_STATE_2:
 596                         x25_disconnect(sk, 0, 0, 0);
 597                         x25_destroy_socket(sk);
 598                         goto out;
 599
 600                 case X25_STATE_1:
 601                 case X25_STATE_3:
 602                 case X25_STATE_4:
 603                         x25_clear_queues(sk);
 604                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 605                         x25_start_t23timer(sk);
 606                         x25->state = X25_STATE_2;
 607                         sk->sk_state    = TCP_CLOSE;
 608                         sk->sk_shutdown |= SEND_SHUTDOWN;
 609                         sk->sk_state_change(sk);
 610                         sock_set_flag(sk, SOCK_DEAD);
 611                         sock_set_flag(sk, SOCK_DESTROY);
 612                         break;
 613         }
 614
 615         sock_orphan(sk);
 616 out:
 617         return 0;
 618 }
 619
 620 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 621 {
 622         struct sock *sk = sock->sk;
 623         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 624
 625         if (!sock_flag(sk, SOCK_ZAPPED) ||
 626             addr_len != sizeof(struct sockaddr_x25) ||
 627             addr->sx25_family != AF_X25)
 628                 return -EINVAL;
 629
 630         x25_sk(sk)->source_addr = addr->sx25_addr;
 631         x25_insert_socket(sk);
 632         sock_reset_flag(sk, SOCK_ZAPPED);
 633         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 634
 635         return 0;
 636 }
 637
 638 static int x25_wait_for_connection_establishment(struct sock *sk)
 639 {
 640         DECLARE_WAITQUEUE(wait, current);
 641         int rc;
 642
 643         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 644         for (;;) {
 645                 __set_current_state(TASK_INTERRUPTIBLE);
 646                 rc = -ERESTARTSYS;
 647                 if (signal_pending(current))
 648                         break;
 649                 rc = sock_error(sk);
 650                 if (rc) {
 651                         sk->sk_socket->state = SS_UNCONNECTED;
 652                         break;
 653                 }
 654                 rc = 0;
 655                 if (sk->sk_state != TCP_ESTABLISHED) {
 656                         release_sock(sk);
 657                         schedule();
 658                         lock_sock(sk);
 659                 } else
 660                         break;
 661         }
 662         __set_current_state(TASK_RUNNING);
 663         remove_wait_queue(sk->sk_sleep, &wait);
 664         return rc;
 665 }
 666
 667 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 668                        int addr_len, int flags)
 669 {
 670         struct sock *sk = sock->sk;
 671         struct x25_sock *x25 = x25_sk(sk);
 672         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 673         struct x25_route *rt;
 674         int rc = 0;
 675
 676         lock_sock(sk);
 677         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 678                 sock->state = SS_CONNECTED;
 679                 goto out; /* Connect completed during a ERESTARTSYS event */
 680         }
 681
 682         rc = -ECONNREFUSED;
 683         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 684                 sock->state = SS_UNCONNECTED;
 685                 goto out;
 686         }
 687
 688         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 689         if (sk->sk_state == TCP_ESTABLISHED)
 690                 goto out;
 691
 692         sk->sk_state   = TCP_CLOSE;
 693         sock->state = SS_UNCONNECTED;
 694
 695         rc = -EINVAL;
 696         if (addr_len != sizeof(struct sockaddr_x25) ||
 697             addr->sx25_family != AF_X25)
 698                 goto out;
 699
 700         rc = -ENETUNREACH;
 701         rt = x25_get_route(&addr->sx25_addr);
 702         if (!rt)
 703                 goto out;
 704
 705         x25->neighbour = x25_get_neigh(rt->dev);
 706         if (!x25->neighbour)
 707                 goto out_put_route;
 708
 709         x25_limit_facilities(&x25->facilities, x25->neighbour);
 710
 711         x25->lci = x25_new_lci(x25->neighbour);
 712         if (!x25->lci)
 713                 goto out_put_neigh;
 714
 715         rc = -EINVAL;
 716         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 717                 goto out_put_neigh;
 718
 719         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 720                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 721
 722         x25->dest_addr = addr->sx25_addr;
 723
 724         /* Move to connecting socket, start sending Connect Requests */
 725         sock->state   = SS_CONNECTING;
 726         sk->sk_state  = TCP_SYN_SENT;
 727
 728         x25->state = X25_STATE_1;
 729
 730         x25_write_internal(sk, X25_CALL_REQUEST);
 731
 732         x25_start_heartbeat(sk);
 733         x25_start_t21timer(sk);
 734
 735         /* Now the loop */
 736         rc = -EINPROGRESS;
 737         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 738                 goto out_put_neigh;
 739
 740         rc = x25_wait_for_connection_establishment(sk);
 741         if (rc)
 742                 goto out_put_neigh;
 743
 744         sock->state = SS_CONNECTED;
 745         rc = 0;
 746 out_put_neigh:
 747         if (rc)
 748                 x25_neigh_put(x25->neighbour);
 749 out_put_route:
 750         x25_route_put(rt);
 751 out:
 752         release_sock(sk);
 753         return rc;
 754 }
 755
 756 static int x25_wait_for_data(struct sock *sk, long timeout)
 757 {
 758         DECLARE_WAITQUEUE(wait, current);
 759         int rc = 0;
 760
 761         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 762         for (;;) {
 763                 __set_current_state(TASK_INTERRUPTIBLE);
 764                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 765                         break;
 766                 rc = -ERESTARTSYS;
 767                 if (signal_pending(current))
 768                         break;
 769                 rc = -EAGAIN;
 770                 if (!timeout)
 771                         break;
 772                 rc = 0;
 773                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 774                         release_sock(sk);
 775                         timeout = schedule_timeout(timeout);
 776                         lock_sock(sk);
 777                 } else
 778                         break;
 779         }
 780         __set_current_state(TASK_RUNNING);
 781         remove_wait_queue(sk->sk_sleep, &wait);
 782         return rc;
 783 }
 784
 785 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 786 {
 787         struct sock *sk = sock->sk;
 788         struct sock *newsk;
 789         struct sk_buff *skb;
 790         int rc = -EINVAL;
 791
 792         if (!sk || sk->sk_state != TCP_LISTEN)
 793                 goto out;
 794
 795         rc = -EOPNOTSUPP;
 796         if (sk->sk_type != SOCK_SEQPACKET)
 797                 goto out;
 798
 799         lock_sock(sk);
 800         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 801         if (rc)
 802                 goto out2;
 803         skb = skb_dequeue(&sk->sk_receive_queue);
 804         rc = -EINVAL;
 805         if (!skb->sk)
 806                 goto out2;
 807         newsk            = skb->sk;
 808         sock_graft(newsk, newsock);
 809
 810         /* Now attach up the new socket */
 811         skb->sk = NULL;
 812         kfree_skb(skb);
 813         sk->sk_ack_backlog--;
 814         newsock->state = SS_CONNECTED;
 815         rc = 0;
 816 out2:
 817         release_sock(sk);
 818 out:
 819         return rc;
 820 }
 821
 822 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 823                        int *uaddr_len, int peer)
 824 {
 825         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 826         struct sock *sk = sock->sk;
 827         struct x25_sock *x25 = x25_sk(sk);
 828
 829         if (peer) {
 830                 if (sk->sk_state != TCP_ESTABLISHED)
 831                         return -ENOTCONN;
 832                 sx25->sx25_addr = x25->dest_addr;
 833         } else
 834                 sx25->sx25_addr = x25->source_addr;
 835
 836         sx25->sx25_family = AF_X25;
 837         *uaddr_len = sizeof(*sx25);
 838
 839         return 0;
 840 }
 841
 842 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 843                         unsigned int lci)
 844 {
 845         struct sock *sk;
 846         struct sock *make;
 847         struct x25_sock *makex25;
 848         struct x25_address source_addr, dest_addr;
 849         struct x25_facilities facilities;
 850         struct x25_dte_facilities dte_facilities;
 851         int len, addr_len, rc;
 852
 853         /*
 854          *      Remove the LCI and frame type.
 855          */
 856         skb_pull(skb, X25_STD_MIN_LEN);
 857
 858         /*
 859          *      Extract the X.25 addresses and convert them to ASCII strings,
 860          *      and remove them.
 861          */
 862         addr_len = x25_addr_ntoa(skb->data, &source_addr, &dest_addr);
 863         skb_pull(skb, addr_len);
 864
 865         /*
 866          *      Get the length of the facilities, skip past them for the moment
 867          *      get the call user data because this is needed to determine
 868          *      the correct listener
 869          */
 870         len = skb->data[0] + 1;
 871         skb_pull(skb,len);
 872
 873         /*
 874          *      Find a listener for the particular address/cud pair.
 875          */
 876         sk = x25_find_listener(&source_addr,skb);
 877         skb_push(skb,len);
 878
 879         if (sk != NULL && sk_acceptq_is_full(sk)) {
 880                 goto out_sock_put;
 881         }
 882
 883         /*
 884          *      We dont have any listeners for this incoming call.
 885          *      Try forwarding it.
 886          */
 887         if (sk == NULL) {
 888                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 889                 if (sysctl_x25_forward &&
 890                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 891                 {
 892                         /* Call was forwarded, dont process it any more */
 893                         kfree_skb(skb);
 894                         rc = 1;
 895                         goto out;
 896                 } else {
 897                         /* No listeners, can't forward, clear the call */
 898                         goto out_clear_request;
 899                 }
 900         }
 901
 902         /*
 903          *      Try to reach a compromise on the requested facilities.
 904          */
 905         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 906         if (len == -1)
 907                 goto out_sock_put;
 908
 909         /*
 910          * current neighbour/link might impose additional limits
 911          * on certain facilties
 912          */
 913
 914         x25_limit_facilities(&facilities, nb);
 915
 916         /*
 917          *      Try to create a new socket.
 918          */
 919         make = x25_make_new(sk);
 920         if (!make)
 921                 goto out_sock_put;
 922
 923         /*
 924          *      Remove the facilities
 925          */
 926         skb_pull(skb, len);
 927
 928         skb->sk     = make;
 929         make->sk_state = TCP_ESTABLISHED;
 930
 931         makex25 = x25_sk(make);
 932         makex25->lci           = lci;
 933         makex25->dest_addr     = dest_addr;
 934         makex25->source_addr   = source_addr;
 935         makex25->neighbour     = nb;
 936         makex25->facilities    = facilities;
 937         makex25->dte_facilities= dte_facilities;
 938         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
 939         /* ensure no reverse facil on accept */
 940         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
 941         /* ensure no calling address extension on accept */
 942         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
 943         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
 944
 945         /* Normally all calls are accepted immediatly */
 946         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
 947                 x25_write_internal(make, X25_CALL_ACCEPTED);
 948                 makex25->state = X25_STATE_3;
 949         }
 950
 951         /*
 952          *      Incoming Call User Data.
 953          */
 954         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
 955         makex25->calluserdata.cudlength = skb->len;
 956
 957         sk->sk_ack_backlog++;
 958
 959         x25_insert_socket(make);
 960
 961         skb_queue_head(&sk->sk_receive_queue, skb);
 962
 963         x25_start_heartbeat(make);
 964
 965         if (!sock_flag(sk, SOCK_DEAD))
 966                 sk->sk_data_ready(sk, skb->len);
 967         rc = 1;
 968         sock_put(sk);
 969 out:
 970         return rc;
 971 out_sock_put:
 972         sock_put(sk);
 973 out_clear_request:
 974         rc = 0;
 975         x25_transmit_clear_request(nb, lci, 0x01);
 976         goto out;
 977 }
 978
 979 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
 980                        struct msghdr *msg, size_t len)
 981 {
 982         struct sock *sk = sock->sk;
 983         struct x25_sock *x25 = x25_sk(sk);
 984         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
 985         struct sockaddr_x25 sx25;
 986         struct sk_buff *skb;
 987         unsigned char *asmptr;
 988         int noblock = msg->msg_flags & MSG_DONTWAIT;
 989         size_t size;
 990         int qbit = 0, rc = -EINVAL;
 991
 992         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
 993                 goto out;
 994
 995         /* we currently don't support segmented records at the user interface */
 996         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
 997                 goto out;
 998
 999         rc = -EADDRNOTAVAIL;
1000         if (sock_flag(sk, SOCK_ZAPPED))
1001                 goto out;
1002
1003         rc = -EPIPE;
1004         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1005                 send_sig(SIGPIPE, current, 0);
1006                 goto out;
1007         }
1008
1009         rc = -ENETUNREACH;
1010         if (!x25->neighbour)
1011                 goto out;
1012
1013         if (usx25) {
1014                 rc = -EINVAL;
1015                 if (msg->msg_namelen < sizeof(sx25))
1016                         goto out;
1017                 memcpy(&sx25, usx25, sizeof(sx25));
1018                 rc = -EISCONN;
1019                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1020                         goto out;
1021                 rc = -EINVAL;
1022                 if (sx25.sx25_family != AF_X25)
1023                         goto out;
1024         } else {
1025                 /*
1026                  *      FIXME 1003.1g - if the socket is like this because
1027                  *      it has become closed (not started closed) we ought
1028                  *      to SIGPIPE, EPIPE;
1029                  */
1030                 rc = -ENOTCONN;
1031                 if (sk->sk_state != TCP_ESTABLISHED)
1032                         goto out;
1033
1034                 sx25.sx25_family = AF_X25;
1035                 sx25.sx25_addr   = x25->dest_addr;
1036         }
1037
1038         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1039
1040         /* Build a packet */
1041         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1042
1043         if ((msg->msg_flags & MSG_OOB) && len > 32)
1044                 len = 32;
1045
1046         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1047
1048         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1049         if (!skb)
1050                 goto out;
1051         X25_SKB_CB(skb)->flags = msg->msg_flags;
1052
1053         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1054
1055         /*
1056          *      Put the data on the end
1057          */
1058         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1059
1060         skb_reset_transport_header(skb);
1061         skb_put(skb, len);
1062
1063         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1064         if (rc)
1065                 goto out_kfree_skb;
1066
1067         /*
1068          *      If the Q BIT Include socket option is in force, the first
1069          *      byte of the user data is the logical value of the Q Bit.
1070          */
1071         if (x25->qbitincl) {
1072                 qbit = skb->data[0];
1073                 skb_pull(skb, 1);
1074         }
1075
1076         /*
1077          *      Push down the X.25 header
1078          */
1079         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1080
1081         if (msg->msg_flags & MSG_OOB) {
1082                 if (x25->neighbour->extended) {
1083                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1084                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1085                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1086                         *asmptr++ = X25_INTERRUPT;
1087                 } else {
1088                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1089                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1090                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1091                         *asmptr++ = X25_INTERRUPT;
1092                 }
1093         } else {
1094                 if (x25->neighbour->extended) {
1095                         /* Build an Extended X.25 header */
1096                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1097                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1098                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1099                         *asmptr++ = X25_DATA;
1100                         *asmptr++ = X25_DATA;
1101                 } else {
1102                         /* Build an Standard X.25 header */
1103                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1104                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1105                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1106                         *asmptr++ = X25_DATA;
1107                 }
1108
1109                 if (qbit)
1110                         skb->data[0] |= X25_Q_BIT;
1111         }
1112
1113         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1114         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1115
1116         rc = -ENOTCONN;
1117         if (sk->sk_state != TCP_ESTABLISHED)
1118                 goto out_kfree_skb;
1119
1120         if (msg->msg_flags & MSG_OOB)
1121                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1122         else {
1123                 rc = x25_output(sk, skb);
1124                 len = rc;
1125                 if (rc < 0)
1126                         kfree_skb(skb);
1127                 else if (x25->qbitincl)
1128                         len++;
1129         }
1130
1131         /*
1132          * lock_sock() is currently only used to serialize this x25_kick()
1133          * against input-driven x25_kick() calls. It currently only blocks
1134          * incoming packets for this socket and does not protect against
1135          * any other socket state changes and is not called from anywhere
1136          * else. As x25_kick() cannot block and as long as all socket
1137          * operations are BKL-wrapped, we don't need take to care about
1138          * purging the backlog queue in x25_release().
1139          *
1140          * Using lock_sock() to protect all socket operations entirely
1141          * (and making the whole x25 stack SMP aware) unfortunately would
1142          * require major changes to {send,recv}msg and skb allocation methods.
1143          * -> 2.5 ;)
1144          */
1145         lock_sock(sk);
1146         x25_kick(sk);
1147         release_sock(sk);
1148         rc = len;
1149 out:
1150         return rc;
1151 out_kfree_skb:
1152         kfree_skb(skb);
1153         goto out;
1154 }
1155
1156
1157 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1158                        struct msghdr *msg, size_t size,
1159                        int flags)
1160 {
1161         struct sock *sk = sock->sk;
1162         struct x25_sock *x25 = x25_sk(sk);
1163         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1164         size_t copied;
1165         int qbit;
1166         struct sk_buff *skb;
1167         unsigned char *asmptr;
1168         int rc = -ENOTCONN;
1169
1170         /*
1171          * This works for seqpacket too. The receiver has ordered the queue for
1172          * us! We do one quick check first though
1173          */
1174         if (sk->sk_state != TCP_ESTABLISHED)
1175                 goto out;
1176
1177         if (flags & MSG_OOB) {
1178                 rc = -EINVAL;
1179                 if (sock_flag(sk, SOCK_URGINLINE) ||
1180                     !skb_peek(&x25->interrupt_in_queue))
1181                         goto out;
1182
1183                 skb = skb_dequeue(&x25->interrupt_in_queue);
1184
1185                 skb_pull(skb, X25_STD_MIN_LEN);
1186
1187                 /*
1188                  *      No Q bit information on Interrupt data.
1189                  */
1190                 if (x25->qbitincl) {
1191                         asmptr  = skb_push(skb, 1);
1192                         *asmptr = 0x00;
1193                 }
1194
1195                 msg->msg_flags |= MSG_OOB;
1196         } else {
1197                 /* Now we can treat all alike */
1198                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1199                                         flags & MSG_DONTWAIT, &rc);
1200                 if (!skb)
1201                         goto out;
1202
1203                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1204
1205                 skb_pull(skb, x25->neighbour->extended ?
1206                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1207
1208                 if (x25->qbitincl) {
1209                         asmptr  = skb_push(skb, 1);
1210                         *asmptr = qbit;
1211                 }
1212         }
1213
1214         skb_reset_transport_header(skb);
1215         copied = skb->len;
1216
1217         if (copied > size) {
1218                 copied = size;
1219                 msg->msg_flags |= MSG_TRUNC;
1220         }
1221
1222         /* Currently, each datagram always contains a complete record */
1223         msg->msg_flags |= MSG_EOR;
1224
1225         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1226         if (rc)
1227                 goto out_free_dgram;
1228
1229         if (sx25) {
1230                 sx25->sx25_family = AF_X25;
1231                 sx25->sx25_addr   = x25->dest_addr;
1232         }
1233
1234         msg->msg_namelen = sizeof(struct sockaddr_x25);
1235
1236         lock_sock(sk);
1237         x25_check_rbuf(sk);
1238         release_sock(sk);
1239         rc = copied;
1240 out_free_dgram:
1241         skb_free_datagram(sk, skb);
1242 out:
1243         return rc;
1244 }
1245
1246
1247 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1248 {
1249         struct sock *sk = sock->sk;
1250         struct x25_sock *x25 = x25_sk(sk);
1251         void __user *argp = (void __user *)arg;
1252         int rc;
1253
1254         switch (cmd) {
1255                 case TIOCOUTQ: {
1256                         int amount = sk->sk_sndbuf -
1257                                      atomic_read(&sk->sk_wmem_alloc);
1258                         if (amount < 0)
1259                                 amount = 0;
1260                         rc = put_user(amount, (unsigned int __user *)argp);
1261                         break;
1262                 }
1263
1264                 case TIOCINQ: {
1265                         struct sk_buff *skb;
1266                         int amount = 0;
1267                         /*
1268                          * These two are safe on a single CPU system as
1269                          * only user tasks fiddle here
1270                          */
1271                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1272                                 amount = skb->len;
1273                         rc = put_user(amount, (unsigned int __user *)argp);
1274                         break;
1275                 }
1276
1277                 case SIOCGSTAMP:
1278                         rc = -EINVAL;
1279                         if (sk)
1280                                 rc = sock_get_timestamp(sk,
1281                                                 (struct timeval __user *)argp);
1282                         break;
1283                 case SIOCGSTAMPNS:
1284                         rc = -EINVAL;
1285                         if (sk)
1286                                 rc = sock_get_timestampns(sk,
1287                                                 (struct timespec __user *)argp);
1288                         break;
1289                 case SIOCGIFADDR:
1290                 case SIOCSIFADDR:
1291                 case SIOCGIFDSTADDR:
1292                 case SIOCSIFDSTADDR:
1293                 case SIOCGIFBRDADDR:
1294                 case SIOCSIFBRDADDR:
1295                 case SIOCGIFNETMASK:
1296                 case SIOCSIFNETMASK:
1297                 case SIOCGIFMETRIC:
1298                 case SIOCSIFMETRIC:
1299                         rc = -EINVAL;
1300                         break;
1301                 case SIOCADDRT:
1302                 case SIOCDELRT:
1303                         rc = -EPERM;
1304                         if (!capable(CAP_NET_ADMIN))
1305                                 break;
1306                         rc = x25_route_ioctl(cmd, argp);
1307                         break;
1308                 case SIOCX25GSUBSCRIP:
1309                         rc = x25_subscr_ioctl(cmd, argp);
1310                         break;
1311                 case SIOCX25SSUBSCRIP:
1312                         rc = -EPERM;
1313                         if (!capable(CAP_NET_ADMIN))
1314                                 break;
1315                         rc = x25_subscr_ioctl(cmd, argp);
1316                         break;
1317                 case SIOCX25GFACILITIES: {
1318                         struct x25_facilities fac = x25->facilities;
1319                         rc = copy_to_user(argp, &fac,
1320                                           sizeof(fac)) ? -EFAULT : 0;
1321                         break;
1322                 }
1323
1324                 case SIOCX25SFACILITIES: {
1325                         struct x25_facilities facilities;
1326                         rc = -EFAULT;
1327                         if (copy_from_user(&facilities, argp,
1328                                            sizeof(facilities)))
1329                                 break;
1330                         rc = -EINVAL;
1331                         if (sk->sk_state != TCP_LISTEN &&
1332                             sk->sk_state != TCP_CLOSE)
1333                                 break;
1334                         if (facilities.pacsize_in < X25_PS16 ||
1335                             facilities.pacsize_in > X25_PS4096)
1336                                 break;
1337                         if (facilities.pacsize_out < X25_PS16 ||
1338                             facilities.pacsize_out > X25_PS4096)
1339                                 break;
1340                         if (facilities.winsize_in < 1 ||
1341                             facilities.winsize_in > 127)
1342                                 break;
1343                         if (facilities.throughput < 0x03 ||
1344                             facilities.throughput > 0xDD)
1345                                 break;
1346                         if (facilities.reverse &&
1347                                 (facilities.reverse | 0x81)!= 0x81)
1348                                 break;
1349                         x25->facilities = facilities;
1350                         rc = 0;
1351                         break;
1352                 }
1353
1354                 case SIOCX25GDTEFACILITIES: {
1355                         rc = copy_to_user(argp, &x25->dte_facilities,
1356                                                 sizeof(x25->dte_facilities));
1357                         if (rc)
1358                                 rc = -EFAULT;
1359                         break;
1360                 }
1361
1362                 case SIOCX25SDTEFACILITIES: {
1363                         struct x25_dte_facilities dtefacs;
1364                         rc = -EFAULT;
1365                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1366                                 break;
1367                         rc = -EINVAL;
1368                         if (sk->sk_state != TCP_LISTEN &&
1369                                         sk->sk_state != TCP_CLOSE)
1370                                 break;
1371                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1372                                 break;
1373                         if (dtefacs.calling_ae == NULL)
1374                                 break;
1375                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1376                                 break;
1377                         if (dtefacs.called_ae == NULL)
1378                                 break;
1379                         x25->dte_facilities = dtefacs;
1380                         rc = 0;
1381                         break;
1382                 }
1383
1384                 case SIOCX25GCALLUSERDATA: {
1385                         struct x25_calluserdata cud = x25->calluserdata;
1386                         rc = copy_to_user(argp, &cud,
1387                                           sizeof(cud)) ? -EFAULT : 0;
1388                         break;
1389                 }
1390
1391                 case SIOCX25SCALLUSERDATA: {
1392                         struct x25_calluserdata calluserdata;
1393
1394                         rc = -EFAULT;
1395                         if (copy_from_user(&calluserdata, argp,
1396                                            sizeof(calluserdata)))
1397                                 break;
1398                         rc = -EINVAL;
1399                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1400                                 break;
1401                         x25->calluserdata = calluserdata;
1402                         rc = 0;
1403                         break;
1404                 }
1405
1406                 case SIOCX25GCAUSEDIAG: {
1407                         struct x25_causediag causediag;
1408                         causediag = x25->causediag;
1409                         rc = copy_to_user(argp, &causediag,
1410                                           sizeof(causediag)) ? -EFAULT : 0;
1411                         break;
1412                 }
1413
1414                 case SIOCX25SCUDMATCHLEN: {
1415                         struct x25_subaddr sub_addr;
1416                         rc = -EINVAL;
1417                         if(sk->sk_state != TCP_CLOSE)
1418                                 break;
1419                         rc = -EFAULT;
1420                         if (copy_from_user(&sub_addr, argp,
1421                                         sizeof(sub_addr)))
1422                                 break;
1423                         rc = -EINVAL;
1424                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1425                                 break;
1426                         x25->cudmatchlength = sub_addr.cudmatchlength;
1427                         rc = 0;
1428                         break;
1429                 }
1430
1431                 case SIOCX25CALLACCPTAPPRV: {
1432                         rc = -EINVAL;
1433                         if (sk->sk_state != TCP_CLOSE)
1434                                 break;
1435                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1436                         rc = 0;
1437                         break;
1438                 }
1439
1440                 case SIOCX25SENDCALLACCPT:  {
1441                         rc = -EINVAL;
1442                         if (sk->sk_state != TCP_ESTABLISHED)
1443                                 break;
1444                         if (x25->accptapprv)    /* must call accptapprv above */
1445                                 break;
1446                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1447                         x25->state = X25_STATE_3;
1448                         rc = 0;
1449                         break;
1450                 }
1451
1452                 default:
1453                         rc = -ENOIOCTLCMD;
1454                         break;
1455         }
1456
1457         return rc;
1458 }
1459
1460 static struct net_proto_family x25_family_ops = {
1461         .family =       AF_X25,
1462         .create =       x25_create,
1463         .owner  =       THIS_MODULE,
1464 };
1465
1466 #ifdef CONFIG_COMPAT
1467 static int compat_x25_subscr_ioctl(unsigned int cmd,
1468                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1469 {
1470         struct compat_x25_subscrip_struct x25_subscr;
1471         struct x25_neigh *nb;
1472         struct net_device *dev;
1473         int rc = -EINVAL;
1474
1475         rc = -EFAULT;
1476         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1477                 goto out;
1478
1479         rc = -EINVAL;
1480         dev = x25_dev_get(x25_subscr.device);
1481         if (dev == NULL)
1482                 goto out;
1483
1484         nb = x25_get_neigh(dev);
1485         if (nb == NULL)
1486                 goto out_dev_put;
1487
1488         dev_put(dev);
1489
1490         if (cmd == SIOCX25GSUBSCRIP) {
1491                 x25_subscr.extended = nb->extended;
1492                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1493                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1494                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1495         } else {
1496                 rc = -EINVAL;
1497                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1498                         rc = 0;
1499                         nb->extended = x25_subscr.extended;
1500                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1501                 }
1502         }
1503         x25_neigh_put(nb);
1504 out:
1505         return rc;
1506 out_dev_put:
1507         dev_put(dev);
1508         goto out;
1509 }
1510
1511 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1512                                 unsigned long arg)
1513 {
1514         void __user *argp = compat_ptr(arg);
1515         struct sock *sk = sock->sk;
1516
1517         int rc = -ENOIOCTLCMD;
1518
1519         switch(cmd) {
1520         case TIOCOUTQ:
1521         case TIOCINQ:
1522                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1523                 break;
1524         case SIOCGSTAMP:
1525                 rc = -EINVAL;
1526                 if (sk)
1527                         rc = compat_sock_get_timestamp(sk,
1528                                         (struct timeval __user*)argp);
1529                 break;
1530         case SIOCGSTAMPNS:
1531                 rc = -EINVAL;
1532                 if (sk)
1533                         rc = compat_sock_get_timestampns(sk,
1534                                         (struct timespec __user*)argp);
1535                 break;
1536         case SIOCGIFADDR:
1537         case SIOCSIFADDR:
1538         case SIOCGIFDSTADDR:
1539         case SIOCSIFDSTADDR:
1540         case SIOCGIFBRDADDR:
1541         case SIOCSIFBRDADDR:
1542         case SIOCGIFNETMASK:
1543         case SIOCSIFNETMASK:
1544         case SIOCGIFMETRIC:
1545         case SIOCSIFMETRIC:
1546                 rc = -EINVAL;
1547                 break;
1548         case SIOCADDRT:
1549         case SIOCDELRT:
1550                 rc = -EPERM;
1551                 if (!capable(CAP_NET_ADMIN))
1552                         break;
1553                 rc = x25_route_ioctl(cmd, argp);
1554                 break;
1555         case SIOCX25GSUBSCRIP:
1556                 rc = compat_x25_subscr_ioctl(cmd, argp);
1557                 break;
1558         case SIOCX25SSUBSCRIP:
1559                 rc = -EPERM;
1560                 if (!capable(CAP_NET_ADMIN))
1561                         break;
1562                 rc = compat_x25_subscr_ioctl(cmd, argp);
1563                 break;
1564         case SIOCX25GFACILITIES:
1565         case SIOCX25SFACILITIES:
1566         case SIOCX25GDTEFACILITIES:
1567         case SIOCX25SDTEFACILITIES:
1568         case SIOCX25GCALLUSERDATA:
1569         case SIOCX25SCALLUSERDATA:
1570         case SIOCX25GCAUSEDIAG:
1571         case SIOCX25SCUDMATCHLEN:
1572         case SIOCX25CALLACCPTAPPRV:
1573         case SIOCX25SENDCALLACCPT:
1574                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1575                 break;
1576         default:
1577                 rc = -ENOIOCTLCMD;
1578                 break;
1579         }
1580         return rc;
1581 }
1582 #endif
1583
1584 static const struct proto_ops SOCKOPS_WRAPPED(x25_proto_ops) = {
1585         .family =       AF_X25,
1586         .owner =        THIS_MODULE,
1587         .release =      x25_release,
1588         .bind =         x25_bind,
1589         .connect =      x25_connect,
1590         .socketpair =   sock_no_socketpair,
1591         .accept =       x25_accept,
1592         .getname =      x25_getname,
1593         .poll =         datagram_poll,
1594         .ioctl =        x25_ioctl,
1595 #ifdef CONFIG_COMPAT
1596         .compat_ioctl = compat_x25_ioctl,
1597 #endif
1598         .listen =       x25_listen,
1599         .shutdown =     sock_no_shutdown,
1600         .setsockopt =   x25_setsockopt,
1601         .getsockopt =   x25_getsockopt,
1602         .sendmsg =      x25_sendmsg,
1603         .recvmsg =      x25_recvmsg,
1604         .mmap =         sock_no_mmap,
1605         .sendpage =     sock_no_sendpage,
1606 };
1607
1608 SOCKOPS_WRAP(x25_proto, AF_X25);
1609
1610 static struct packet_type x25_packet_type __read_mostly = {
1611         .type = cpu_to_be16(ETH_P_X25),
1612         .func = x25_lapb_receive_frame,
1613 };
1614
1615 static struct notifier_block x25_dev_notifier = {
1616         .notifier_call = x25_device_event,
1617 };
1618
1619 void x25_kill_by_neigh(struct x25_neigh *nb)
1620 {
1621         struct sock *s;
1622         struct hlist_node *node;
1623
1624         write_lock_bh(&x25_list_lock);
1625
1626         sk_for_each(s, node, &x25_list)
1627                 if (x25_sk(s)->neighbour == nb)
1628                         x25_disconnect(s, ENETUNREACH, 0, 0);
1629
1630         write_unlock_bh(&x25_list_lock);
1631
1632         /* Remove any related forwards */
1633         x25_clear_forward_by_dev(nb->dev);
1634 }
1635
1636 static int __init x25_init(void)
1637 {
1638         int rc = proto_register(&x25_proto, 0);
1639
1640         if (rc != 0)
1641                 goto out;
1642
1643         sock_register(&x25_family_ops);
1644
1645         dev_add_pack(&x25_packet_type);
1646
1647         register_netdevice_notifier(&x25_dev_notifier);
1648
1649         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1650
1651 #ifdef CONFIG_SYSCTL
1652         x25_register_sysctl();
1653 #endif
1654         x25_proc_init();
1655 out:
1656         return rc;
1657 }
1658 module_init(x25_init);
1659
1660 static void __exit x25_exit(void)
1661 {
1662         x25_proc_exit();
1663         x25_link_free();
1664         x25_route_free();
1665
1666 #ifdef CONFIG_SYSCTL
1667         x25_unregister_sysctl();
1668 #endif
1669
1670         unregister_netdevice_notifier(&x25_dev_notifier);
1671
1672         dev_remove_pack(&x25_packet_type);
1673
1674         sock_unregister(AF_X25);
1675         proto_unregister(&x25_proto);
1676 }
1677 module_exit(x25_exit);
1678
1679 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1680 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1681 MODULE_LICENSE("GPL");
1682 MODULE_ALIAS_NETPROTO(PF_X25);