net/x25/af_x25.c

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/capability.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/smp_lock.h>
  44 #include <linux/timer.h>
  45 #include <linux/string.h>
  46 #include <linux/net.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/skbuff.h>
  50 #include <linux/slab.h>
  51 #include <net/sock.h>
  52 #include <net/tcp_states.h>
  53 #include <asm/uaccess.h>
  54 #include <linux/fcntl.h>
  55 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  56 #include <linux/notifier.h>
  57 #include <linux/init.h>
  58 #include <linux/compat.h>
  59 #include <linux/ctype.h>
  60
  61 #include <net/x25.h>
  62 #include <net/compat.h>
  63
  64 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  65 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  66 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  67 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  68 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  69 int sysctl_x25_forward                 = 0;
  70
  71 HLIST_HEAD(x25_list);
  72 DEFINE_RWLOCK(x25_list_lock);
  73
  74 static const struct proto_ops x25_proto_ops;
  75
  76 static struct x25_address null_x25_address = {"               "};
  77
  78 #ifdef CONFIG_COMPAT
  79 struct compat_x25_subscrip_struct {
  80         char device[200-sizeof(compat_ulong_t)];
  81         compat_ulong_t global_facil_mask;
  82         compat_uint_t extended;
  83 };
  84 #endif
  85
  86
  87 int x25_parse_address_block(struct sk_buff *skb,
  88                 struct x25_address *called_addr,
  89                 struct x25_address *calling_addr)
  90 {
  91         unsigned char len;
  92         int needed;
  93         int rc;
  94
  95         if (skb->len < 1) {
  96                 /* packet has no address block */
  97                 rc = 0;
  98                 goto empty;
  99         }
 100
 101         len = *skb->data;
 102         needed = 1 + (len >> 4) + (len & 0x0f);
 103
 104         if (skb->len < needed) {
 105                 /* packet is too short to hold the addresses it claims
 106                    to hold */
 107                 rc = -1;
 108                 goto empty;
 109         }
 110
 111         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 112
 113 empty:
 114         *called_addr->x25_addr = 0;
 115         *calling_addr->x25_addr = 0;
 116
 117         return rc;
 118 }
 119
 120
 121 int x25_addr_ntoa(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         unsigned int i;
 127
 128         called_len  = (*p >> 0) & 0x0F;
 129         calling_len = (*p >> 4) & 0x0F;
 130
 131         called  = called_addr->x25_addr;
 132         calling = calling_addr->x25_addr;
 133         p++;
 134
 135         for (i = 0; i < (called_len + calling_len); i++) {
 136                 if (i < called_len) {
 137                         if (i % 2 != 0) {
 138                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 139                                 p++;
 140                         } else {
 141                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 142                         }
 143                 } else {
 144                         if (i % 2 != 0) {
 145                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 146                                 p++;
 147                         } else {
 148                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 149                         }
 150                 }
 151         }
 152
 153         *called = *calling = '\0';
 154
 155         return 1 + (called_len + calling_len + 1) / 2;
 156 }
 157
 158 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 159                   struct x25_address *calling_addr)
 160 {
 161         unsigned int called_len, calling_len;
 162         char *called, *calling;
 163         int i;
 164
 165         called  = called_addr->x25_addr;
 166         calling = calling_addr->x25_addr;
 167
 168         called_len  = strlen(called);
 169         calling_len = strlen(calling);
 170
 171         *p++ = (calling_len << 4) | (called_len << 0);
 172
 173         for (i = 0; i < (called_len + calling_len); i++) {
 174                 if (i < called_len) {
 175                         if (i % 2 != 0) {
 176                                 *p |= (*called++ - '0') << 0;
 177                                 p++;
 178                         } else {
 179                                 *p = 0x00;
 180                                 *p |= (*called++ - '0') << 4;
 181                         }
 182                 } else {
 183                         if (i % 2 != 0) {
 184                                 *p |= (*calling++ - '0') << 0;
 185                                 p++;
 186                         } else {
 187                                 *p = 0x00;
 188                                 *p |= (*calling++ - '0') << 4;
 189                         }
 190                 }
 191         }
 192
 193         return 1 + (called_len + calling_len + 1) / 2;
 194 }
 195
 196 /*
 197  *      Socket removal during an interrupt is now safe.
 198  */
 199 static void x25_remove_socket(struct sock *sk)
 200 {
 201         write_lock_bh(&x25_list_lock);
 202         sk_del_node_init(sk);
 203         write_unlock_bh(&x25_list_lock);
 204 }
 205
 206 /*
 207  *      Kill all bound sockets on a dropped device.
 208  */
 209 static void x25_kill_by_device(struct net_device *dev)
 210 {
 211         struct sock *s;
 212         struct hlist_node *node;
 213
 214         write_lock_bh(&x25_list_lock);
 215
 216         sk_for_each(s, node, &x25_list)
 217                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 218                         x25_disconnect(s, ENETUNREACH, 0, 0);
 219
 220         write_unlock_bh(&x25_list_lock);
 221 }
 222
 223 /*
 224  *      Handle device status changes.
 225  */
 226 static int x25_device_event(struct notifier_block *this, unsigned long event,
 227                             void *ptr)
 228 {
 229         struct net_device *dev = ptr;
 230         struct x25_neigh *nb;
 231
 232         if (!net_eq(dev_net(dev), &init_net))
 233                 return NOTIFY_DONE;
 234
 235         if (dev->type == ARPHRD_X25
 236 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 237          || dev->type == ARPHRD_ETHER
 238 #endif
 239          ) {
 240                 switch (event) {
 241                         case NETDEV_UP:
 242                                 x25_link_device_up(dev);
 243                                 break;
 244                         case NETDEV_GOING_DOWN:
 245                                 nb = x25_get_neigh(dev);
 246                                 if (nb) {
 247                                         x25_terminate_link(nb);
 248                                         x25_neigh_put(nb);
 249                                 }
 250                                 break;
 251                         case NETDEV_DOWN:
 252                                 x25_kill_by_device(dev);
 253                                 x25_route_device_down(dev);
 254                                 x25_link_device_down(dev);
 255                                 break;
 256                 }
 257         }
 258
 259         return NOTIFY_DONE;
 260 }
 261
 262 /*
 263  *      Add a socket to the bound sockets list.
 264  */
 265 static void x25_insert_socket(struct sock *sk)
 266 {
 267         write_lock_bh(&x25_list_lock);
 268         sk_add_node(sk, &x25_list);
 269         write_unlock_bh(&x25_list_lock);
 270 }
 271
 272 /*
 273  *      Find a socket that wants to accept the Call Request we just
 274  *      received. Check the full list for an address/cud match.
 275  *      If no cuds match return the next_best thing, an address match.
 276  *      Note: if a listening socket has cud set it must only get calls
 277  *      with matching cud.
 278  */
 279 static struct sock *x25_find_listener(struct x25_address *addr,
 280                                         struct sk_buff *skb)
 281 {
 282         struct sock *s;
 283         struct sock *next_best;
 284         struct hlist_node *node;
 285
 286         read_lock_bh(&x25_list_lock);
 287         next_best = NULL;
 288
 289         sk_for_each(s, node, &x25_list)
 290                 if ((!strcmp(addr->x25_addr,
 291                         x25_sk(s)->source_addr.x25_addr) ||
 292                                 !strcmp(addr->x25_addr,
 293                                         null_x25_address.x25_addr)) &&
 294                                         s->sk_state == TCP_LISTEN) {
 295                         /*
 296                          * Found a listening socket, now check the incoming
 297                          * call user data vs this sockets call user data
 298                          */
 299                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 300                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 301                                         skb->data,
 302                                         x25_sk(s)->cudmatchlength)) == 0) {
 303                                         sock_hold(s);
 304                                         goto found;
 305                                  }
 306                         } else
 307                                 next_best = s;
 308                 }
 309         if (next_best) {
 310                 s = next_best;
 311                 sock_hold(s);
 312                 goto found;
 313         }
 314         s = NULL;
 315 found:
 316         read_unlock_bh(&x25_list_lock);
 317         return s;
 318 }
 319
 320 /*
 321  *      Find a connected X.25 socket given my LCI and neighbour.
 322  */
 323 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 324 {
 325         struct sock *s;
 326         struct hlist_node *node;
 327
 328         sk_for_each(s, node, &x25_list)
 329                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 330                         sock_hold(s);
 331                         goto found;
 332                 }
 333         s = NULL;
 334 found:
 335         return s;
 336 }
 337
 338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 339 {
 340         struct sock *s;
 341
 342         read_lock_bh(&x25_list_lock);
 343         s = __x25_find_socket(lci, nb);
 344         read_unlock_bh(&x25_list_lock);
 345         return s;
 346 }
 347
 348 /*
 349  *      Find a unique LCI for a given device.
 350  */
 351 static unsigned int x25_new_lci(struct x25_neigh *nb)
 352 {
 353         unsigned int lci = 1;
 354         struct sock *sk;
 355
 356         read_lock_bh(&x25_list_lock);
 357
 358         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 359                 sock_put(sk);
 360                 if (++lci == 4096) {
 361                         lci = 0;
 362                         break;
 363                 }
 364         }
 365
 366         read_unlock_bh(&x25_list_lock);
 367         return lci;
 368 }
 369
 370 /*
 371  *      Deferred destroy.
 372  */
 373 static void __x25_destroy_socket(struct sock *);
 374
 375 /*
 376  *      handler for deferred kills.
 377  */
 378 static void x25_destroy_timer(unsigned long data)
 379 {
 380         x25_destroy_socket_from_timer((struct sock *)data);
 381 }
 382
 383 /*
 384  *      This is called from user mode and the timers. Thus it protects itself
 385  *      against interrupt users but doesn't worry about being called during
 386  *      work. Once it is removed from the queue no interrupt or bottom half
 387  *      will touch it and we are (fairly 8-) ) safe.
 388  *      Not static as it's used by the timer
 389  */
 390 static void __x25_destroy_socket(struct sock *sk)
 391 {
 392         struct sk_buff *skb;
 393
 394         x25_stop_heartbeat(sk);
 395         x25_stop_timer(sk);
 396
 397         x25_remove_socket(sk);
 398         x25_clear_queues(sk);           /* Flush the queues */
 399
 400         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 401                 if (skb->sk != sk) {            /* A pending connection */
 402                         /*
 403                          * Queue the unaccepted socket for death
 404                          */
 405                         skb->sk->sk_state = TCP_LISTEN;
 406                         sock_set_flag(skb->sk, SOCK_DEAD);
 407                         x25_start_heartbeat(skb->sk);
 408                         x25_sk(skb->sk)->state = X25_STATE_0;
 409                 }
 410
 411                 kfree_skb(skb);
 412         }
 413
 414         if (sk_has_allocations(sk)) {
 415                 /* Defer: outstanding buffers */
 416                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 417                 sk->sk_timer.function = x25_destroy_timer;
 418                 sk->sk_timer.data = (unsigned long)sk;
 419                 add_timer(&sk->sk_timer);
 420         } else {
 421                 /* drop last reference so sock_put will free */
 422                 __sock_put(sk);
 423         }
 424 }
 425
 426 void x25_destroy_socket_from_timer(struct sock *sk)
 427 {
 428         sock_hold(sk);
 429         bh_lock_sock(sk);
 430         __x25_destroy_socket(sk);
 431         bh_unlock_sock(sk);
 432         sock_put(sk);
 433 }
 434
 435 static void x25_destroy_socket(struct sock *sk)
 436 {
 437         sock_hold(sk);
 438         lock_sock(sk);
 439         __x25_destroy_socket(sk);
 440         release_sock(sk);
 441         sock_put(sk);
 442 }
 443
 444 /*
 445  *      Handling for system calls applied via the various interfaces to a
 446  *      X.25 socket object.
 447  */
 448
 449 static int x25_setsockopt(struct socket *sock, int level, int optname,
 450                           char __user *optval, unsigned int optlen)
 451 {
 452         int opt;
 453         struct sock *sk = sock->sk;
 454         int rc = -ENOPROTOOPT;
 455
 456         if (level != SOL_X25 || optname != X25_QBITINCL)
 457                 goto out;
 458
 459         rc = -EINVAL;
 460         if (optlen < sizeof(int))
 461                 goto out;
 462
 463         rc = -EFAULT;
 464         if (get_user(opt, (int __user *)optval))
 465                 goto out;
 466
 467         if (opt)
 468                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 469         else
 470                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 471         rc = 0;
 472 out:
 473         return rc;
 474 }
 475
 476 static int x25_getsockopt(struct socket *sock, int level, int optname,
 477                           char __user *optval, int __user *optlen)
 478 {
 479         struct sock *sk = sock->sk;
 480         int val, len, rc = -ENOPROTOOPT;
 481
 482         if (level != SOL_X25 || optname != X25_QBITINCL)
 483                 goto out;
 484
 485         rc = -EFAULT;
 486         if (get_user(len, optlen))
 487                 goto out;
 488
 489         len = min_t(unsigned int, len, sizeof(int));
 490
 491         rc = -EINVAL;
 492         if (len < 0)
 493                 goto out;
 494
 495         rc = -EFAULT;
 496         if (put_user(len, optlen))
 497                 goto out;
 498
 499         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 500         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 501 out:
 502         return rc;
 503 }
 504
 505 static int x25_listen(struct socket *sock, int backlog)
 506 {
 507         struct sock *sk = sock->sk;
 508         int rc = -EOPNOTSUPP;
 509
 510         lock_sock(sk);
 511         if (sk->sk_state != TCP_LISTEN) {
 512                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 513                 sk->sk_max_ack_backlog = backlog;
 514                 sk->sk_state           = TCP_LISTEN;
 515                 rc = 0;
 516         }
 517         release_sock(sk);
 518
 519         return rc;
 520 }
 521
 522 static struct proto x25_proto = {
 523         .name     = "X25",
 524         .owner    = THIS_MODULE,
 525         .obj_size = sizeof(struct x25_sock),
 526 };
 527
 528 static struct sock *x25_alloc_socket(struct net *net)
 529 {
 530         struct x25_sock *x25;
 531         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 532
 533         if (!sk)
 534                 goto out;
 535
 536         sock_init_data(NULL, sk);
 537
 538         x25 = x25_sk(sk);
 539         skb_queue_head_init(&x25->ack_queue);
 540         skb_queue_head_init(&x25->fragment_queue);
 541         skb_queue_head_init(&x25->interrupt_in_queue);
 542         skb_queue_head_init(&x25->interrupt_out_queue);
 543 out:
 544         return sk;
 545 }
 546
 547 static int x25_create(struct net *net, struct socket *sock, int protocol,
 548                       int kern)
 549 {
 550         struct sock *sk;
 551         struct x25_sock *x25;
 552         int rc = -EAFNOSUPPORT;
 553
 554         if (!net_eq(net, &init_net))
 555                 goto out;
 556
 557         rc = -ESOCKTNOSUPPORT;
 558         if (sock->type != SOCK_SEQPACKET)
 559                 goto out;
 560
 561         rc = -EINVAL;
 562         if (protocol)
 563                 goto out;
 564
 565         rc = -ENOBUFS;
 566         if ((sk = x25_alloc_socket(net)) == NULL)
 567                 goto out;
 568
 569         x25 = x25_sk(sk);
 570
 571         sock_init_data(sock, sk);
 572
 573         x25_init_timers(sk);
 574
 575         sock->ops    = &x25_proto_ops;
 576         sk->sk_protocol = protocol;
 577         sk->sk_backlog_rcv = x25_backlog_rcv;
 578
 579         x25->t21   = sysctl_x25_call_request_timeout;
 580         x25->t22   = sysctl_x25_reset_request_timeout;
 581         x25->t23   = sysctl_x25_clear_request_timeout;
 582         x25->t2    = sysctl_x25_ack_holdback_timeout;
 583         x25->state = X25_STATE_0;
 584         x25->cudmatchlength = 0;
 585         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 586                                                         /* on call accept   */
 587
 588         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 589         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 590         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 591         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 592         x25->facilities.throughput  = 0;        /* by default don't negotiate
 593                                                    throughput */
 594         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 595         x25->dte_facilities.calling_len = 0;
 596         x25->dte_facilities.called_len = 0;
 597         memset(x25->dte_facilities.called_ae, '\0',
 598                         sizeof(x25->dte_facilities.called_ae));
 599         memset(x25->dte_facilities.calling_ae, '\0',
 600                         sizeof(x25->dte_facilities.calling_ae));
 601
 602         rc = 0;
 603 out:
 604         return rc;
 605 }
 606
 607 static struct sock *x25_make_new(struct sock *osk)
 608 {
 609         struct sock *sk = NULL;
 610         struct x25_sock *x25, *ox25;
 611
 612         if (osk->sk_type != SOCK_SEQPACKET)
 613                 goto out;
 614
 615         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 616                 goto out;
 617
 618         x25 = x25_sk(sk);
 619
 620         sk->sk_type        = osk->sk_type;
 621         sk->sk_priority    = osk->sk_priority;
 622         sk->sk_protocol    = osk->sk_protocol;
 623         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 624         sk->sk_sndbuf      = osk->sk_sndbuf;
 625         sk->sk_state       = TCP_ESTABLISHED;
 626         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 627         sock_copy_flags(sk, osk);
 628
 629         ox25 = x25_sk(osk);
 630         x25->t21        = ox25->t21;
 631         x25->t22        = ox25->t22;
 632         x25->t23        = ox25->t23;
 633         x25->t2         = ox25->t2;
 634         x25->flags      = ox25->flags;
 635         x25->facilities = ox25->facilities;
 636         x25->dte_facilities = ox25->dte_facilities;
 637         x25->cudmatchlength = ox25->cudmatchlength;
 638
 639         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 640         x25_init_timers(sk);
 641 out:
 642         return sk;
 643 }
 644
 645 static int x25_release(struct socket *sock)
 646 {
 647         struct sock *sk = sock->sk;
 648         struct x25_sock *x25;
 649
 650         lock_kernel();
 651         if (!sk)
 652                 goto out;
 653
 654         x25 = x25_sk(sk);
 655
 656         switch (x25->state) {
 657
 658                 case X25_STATE_0:
 659                 case X25_STATE_2:
 660                         x25_disconnect(sk, 0, 0, 0);
 661                         x25_destroy_socket(sk);
 662                         goto out;
 663
 664                 case X25_STATE_1:
 665                 case X25_STATE_3:
 666                 case X25_STATE_4:
 667                         x25_clear_queues(sk);
 668                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 669                         x25_start_t23timer(sk);
 670                         x25->state = X25_STATE_2;
 671                         sk->sk_state    = TCP_CLOSE;
 672                         sk->sk_shutdown |= SEND_SHUTDOWN;
 673                         sk->sk_state_change(sk);
 674                         sock_set_flag(sk, SOCK_DEAD);
 675                         sock_set_flag(sk, SOCK_DESTROY);
 676                         break;
 677         }
 678
 679         sock_orphan(sk);
 680 out:
 681         unlock_kernel();
 682         return 0;
 683 }
 684
 685 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 686 {
 687         struct sock *sk = sock->sk;
 688         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 689         int len, i, rc = 0;
 690
 691         if (!sock_flag(sk, SOCK_ZAPPED) ||
 692             addr_len != sizeof(struct sockaddr_x25) ||
 693             addr->sx25_family != AF_X25) {
 694                 rc = -EINVAL;
 695                 goto out;
 696         }
 697
 698         len = strlen(addr->sx25_addr.x25_addr);
 699         for (i = 0; i < len; i++) {
 700                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 701                         rc = -EINVAL;
 702                         goto out;
 703                 }
 704         }
 705
 706         lock_sock(sk);
 707         x25_sk(sk)->source_addr = addr->sx25_addr;
 708         x25_insert_socket(sk);
 709         sock_reset_flag(sk, SOCK_ZAPPED);
 710         release_sock(sk);
 711         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 712 out:
 713         return rc;
 714 }
 715
 716 static int x25_wait_for_connection_establishment(struct sock *sk)
 717 {
 718         DECLARE_WAITQUEUE(wait, current);
 719         int rc;
 720
 721         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 722         for (;;) {
 723                 __set_current_state(TASK_INTERRUPTIBLE);
 724                 rc = -ERESTARTSYS;
 725                 if (signal_pending(current))
 726                         break;
 727                 rc = sock_error(sk);
 728                 if (rc) {
 729                         sk->sk_socket->state = SS_UNCONNECTED;
 730                         break;
 731                 }
 732                 rc = 0;
 733                 if (sk->sk_state != TCP_ESTABLISHED) {
 734                         release_sock(sk);
 735                         schedule();
 736                         lock_sock(sk);
 737                 } else
 738                         break;
 739         }
 740         __set_current_state(TASK_RUNNING);
 741         remove_wait_queue(sk_sleep(sk), &wait);
 742         return rc;
 743 }
 744
 745 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 746                        int addr_len, int flags)
 747 {
 748         struct sock *sk = sock->sk;
 749         struct x25_sock *x25 = x25_sk(sk);
 750         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 751         struct x25_route *rt;
 752         int rc = 0;
 753
 754         lock_sock(sk);
 755         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 756                 sock->state = SS_CONNECTED;
 757                 goto out; /* Connect completed during a ERESTARTSYS event */
 758         }
 759
 760         rc = -ECONNREFUSED;
 761         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 762                 sock->state = SS_UNCONNECTED;
 763                 goto out;
 764         }
 765
 766         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 767         if (sk->sk_state == TCP_ESTABLISHED)
 768                 goto out;
 769
 770         sk->sk_state   = TCP_CLOSE;
 771         sock->state = SS_UNCONNECTED;
 772
 773         rc = -EINVAL;
 774         if (addr_len != sizeof(struct sockaddr_x25) ||
 775             addr->sx25_family != AF_X25)
 776                 goto out;
 777
 778         rc = -ENETUNREACH;
 779         rt = x25_get_route(&addr->sx25_addr);
 780         if (!rt)
 781                 goto out;
 782
 783         x25->neighbour = x25_get_neigh(rt->dev);
 784         if (!x25->neighbour)
 785                 goto out_put_route;
 786
 787         x25_limit_facilities(&x25->facilities, x25->neighbour);
 788
 789         x25->lci = x25_new_lci(x25->neighbour);
 790         if (!x25->lci)
 791                 goto out_put_neigh;
 792
 793         rc = -EINVAL;
 794         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 795                 goto out_put_neigh;
 796
 797         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 798                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 799
 800         x25->dest_addr = addr->sx25_addr;
 801
 802         /* Move to connecting socket, start sending Connect Requests */
 803         sock->state   = SS_CONNECTING;
 804         sk->sk_state  = TCP_SYN_SENT;
 805
 806         x25->state = X25_STATE_1;
 807
 808         x25_write_internal(sk, X25_CALL_REQUEST);
 809
 810         x25_start_heartbeat(sk);
 811         x25_start_t21timer(sk);
 812
 813         /* Now the loop */
 814         rc = -EINPROGRESS;
 815         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 816                 goto out_put_neigh;
 817
 818         rc = x25_wait_for_connection_establishment(sk);
 819         if (rc)
 820                 goto out_put_neigh;
 821
 822         sock->state = SS_CONNECTED;
 823         rc = 0;
 824 out_put_neigh:
 825         if (rc)
 826                 x25_neigh_put(x25->neighbour);
 827 out_put_route:
 828         x25_route_put(rt);
 829 out:
 830         release_sock(sk);
 831         return rc;
 832 }
 833
 834 static int x25_wait_for_data(struct sock *sk, long timeout)
 835 {
 836         DECLARE_WAITQUEUE(wait, current);
 837         int rc = 0;
 838
 839         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 840         for (;;) {
 841                 __set_current_state(TASK_INTERRUPTIBLE);
 842                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 843                         break;
 844                 rc = -ERESTARTSYS;
 845                 if (signal_pending(current))
 846                         break;
 847                 rc = -EAGAIN;
 848                 if (!timeout)
 849                         break;
 850                 rc = 0;
 851                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 852                         release_sock(sk);
 853                         timeout = schedule_timeout(timeout);
 854                         lock_sock(sk);
 855                 } else
 856                         break;
 857         }
 858         __set_current_state(TASK_RUNNING);
 859         remove_wait_queue(sk_sleep(sk), &wait);
 860         return rc;
 861 }
 862
 863 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 864 {
 865         struct sock *sk = sock->sk;
 866         struct sock *newsk;
 867         struct sk_buff *skb;
 868         int rc = -EINVAL;
 869
 870         if (!sk)
 871                 goto out;
 872
 873         rc = -EOPNOTSUPP;
 874         if (sk->sk_type != SOCK_SEQPACKET)
 875                 goto out;
 876
 877         lock_sock(sk);
 878         rc = -EINVAL;
 879         if (sk->sk_state != TCP_LISTEN)
 880                 goto out2;
 881
 882         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 883         if (rc)
 884                 goto out2;
 885         skb = skb_dequeue(&sk->sk_receive_queue);
 886         rc = -EINVAL;
 887         if (!skb->sk)
 888                 goto out2;
 889         newsk            = skb->sk;
 890         sock_graft(newsk, newsock);
 891
 892         /* Now attach up the new socket */
 893         skb->sk = NULL;
 894         kfree_skb(skb);
 895         sk->sk_ack_backlog--;
 896         newsock->state = SS_CONNECTED;
 897         rc = 0;
 898 out2:
 899         release_sock(sk);
 900 out:
 901         return rc;
 902 }
 903
 904 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 905                        int *uaddr_len, int peer)
 906 {
 907         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 908         struct sock *sk = sock->sk;
 909         struct x25_sock *x25 = x25_sk(sk);
 910         int rc = 0;
 911
 912         if (peer) {
 913                 if (sk->sk_state != TCP_ESTABLISHED) {
 914                         rc = -ENOTCONN;
 915                         goto out;
 916                 }
 917                 sx25->sx25_addr = x25->dest_addr;
 918         } else
 919                 sx25->sx25_addr = x25->source_addr;
 920
 921         sx25->sx25_family = AF_X25;
 922         *uaddr_len = sizeof(*sx25);
 923
 924 out:
 925         return rc;
 926 }
 927
 928 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 929                         unsigned int lci)
 930 {
 931         struct sock *sk;
 932         struct sock *make;
 933         struct x25_sock *makex25;
 934         struct x25_address source_addr, dest_addr;
 935         struct x25_facilities facilities;
 936         struct x25_dte_facilities dte_facilities;
 937         int len, addr_len, rc;
 938
 939         /*
 940          *      Remove the LCI and frame type.
 941          */
 942         skb_pull(skb, X25_STD_MIN_LEN);
 943
 944         /*
 945          *      Extract the X.25 addresses and convert them to ASCII strings,
 946          *      and remove them.
 947          *
 948          *      Address block is mandatory in call request packets
 949          */
 950         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 951         if (addr_len <= 0)
 952                 goto out_clear_request;
 953         skb_pull(skb, addr_len);
 954
 955         /*
 956          *      Get the length of the facilities, skip past them for the moment
 957          *      get the call user data because this is needed to determine
 958          *      the correct listener
 959          *
 960          *      Facilities length is mandatory in call request packets
 961          */
 962         if (skb->len < 1)
 963                 goto out_clear_request;
 964         len = skb->data[0] + 1;
 965         if (skb->len < len)
 966                 goto out_clear_request;
 967         skb_pull(skb,len);
 968
 969         /*
 970          *      Find a listener for the particular address/cud pair.
 971          */
 972         sk = x25_find_listener(&source_addr,skb);
 973         skb_push(skb,len);
 974
 975         if (sk != NULL && sk_acceptq_is_full(sk)) {
 976                 goto out_sock_put;
 977         }
 978
 979         /*
 980          *      We dont have any listeners for this incoming call.
 981          *      Try forwarding it.
 982          */
 983         if (sk == NULL) {
 984                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 985                 if (sysctl_x25_forward &&
 986                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 987                 {
 988                         /* Call was forwarded, dont process it any more */
 989                         kfree_skb(skb);
 990                         rc = 1;
 991                         goto out;
 992                 } else {
 993                         /* No listeners, can't forward, clear the call */
 994                         goto out_clear_request;
 995                 }
 996         }
 997
 998         /*
 999          *      Try to reach a compromise on the requested facilities.
1000          */
1001         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1002         if (len == -1)
1003                 goto out_sock_put;
1004
1005         /*
1006          * current neighbour/link might impose additional limits
1007          * on certain facilties
1008          */
1009
1010         x25_limit_facilities(&facilities, nb);
1011
1012         /*
1013          *      Try to create a new socket.
1014          */
1015         make = x25_make_new(sk);
1016         if (!make)
1017                 goto out_sock_put;
1018
1019         /*
1020          *      Remove the facilities
1021          */
1022         skb_pull(skb, len);
1023
1024         skb->sk     = make;
1025         make->sk_state = TCP_ESTABLISHED;
1026
1027         makex25 = x25_sk(make);
1028         makex25->lci           = lci;
1029         makex25->dest_addr     = dest_addr;
1030         makex25->source_addr   = source_addr;
1031         makex25->neighbour     = nb;
1032         makex25->facilities    = facilities;
1033         makex25->dte_facilities= dte_facilities;
1034         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1035         /* ensure no reverse facil on accept */
1036         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1037         /* ensure no calling address extension on accept */
1038         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1039         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1040
1041         /* Normally all calls are accepted immediately */
1042         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1043                 x25_write_internal(make, X25_CALL_ACCEPTED);
1044                 makex25->state = X25_STATE_3;
1045         }
1046
1047         /*
1048          *      Incoming Call User Data.
1049          */
1050         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1051         makex25->calluserdata.cudlength = skb->len;
1052
1053         sk->sk_ack_backlog++;
1054
1055         x25_insert_socket(make);
1056
1057         skb_queue_head(&sk->sk_receive_queue, skb);
1058
1059         x25_start_heartbeat(make);
1060
1061         if (!sock_flag(sk, SOCK_DEAD))
1062                 sk->sk_data_ready(sk, skb->len);
1063         rc = 1;
1064         sock_put(sk);
1065 out:
1066         return rc;
1067 out_sock_put:
1068         sock_put(sk);
1069 out_clear_request:
1070         rc = 0;
1071         x25_transmit_clear_request(nb, lci, 0x01);
1072         goto out;
1073 }
1074
1075 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1076                        struct msghdr *msg, size_t len)
1077 {
1078         struct sock *sk = sock->sk;
1079         struct x25_sock *x25 = x25_sk(sk);
1080         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1081         struct sockaddr_x25 sx25;
1082         struct sk_buff *skb;
1083         unsigned char *asmptr;
1084         int noblock = msg->msg_flags & MSG_DONTWAIT;
1085         size_t size;
1086         int qbit = 0, rc = -EINVAL;
1087
1088         lock_kernel();
1089         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1090                 goto out;
1091
1092         /* we currently don't support segmented records at the user interface */
1093         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1094                 goto out;
1095
1096         rc = -EADDRNOTAVAIL;
1097         if (sock_flag(sk, SOCK_ZAPPED))
1098                 goto out;
1099
1100         rc = -EPIPE;
1101         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1102                 send_sig(SIGPIPE, current, 0);
1103                 goto out;
1104         }
1105
1106         rc = -ENETUNREACH;
1107         if (!x25->neighbour)
1108                 goto out;
1109
1110         if (usx25) {
1111                 rc = -EINVAL;
1112                 if (msg->msg_namelen < sizeof(sx25))
1113                         goto out;
1114                 memcpy(&sx25, usx25, sizeof(sx25));
1115                 rc = -EISCONN;
1116                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1117                         goto out;
1118                 rc = -EINVAL;
1119                 if (sx25.sx25_family != AF_X25)
1120                         goto out;
1121         } else {
1122                 /*
1123                  *      FIXME 1003.1g - if the socket is like this because
1124                  *      it has become closed (not started closed) we ought
1125                  *      to SIGPIPE, EPIPE;
1126                  */
1127                 rc = -ENOTCONN;
1128                 if (sk->sk_state != TCP_ESTABLISHED)
1129                         goto out;
1130
1131                 sx25.sx25_family = AF_X25;
1132                 sx25.sx25_addr   = x25->dest_addr;
1133         }
1134
1135         /* Sanity check the packet size */
1136         if (len > 65535) {
1137                 rc = -EMSGSIZE;
1138                 goto out;
1139         }
1140
1141         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1142
1143         /* Build a packet */
1144         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1145
1146         if ((msg->msg_flags & MSG_OOB) && len > 32)
1147                 len = 32;
1148
1149         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1150
1151         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1152         if (!skb)
1153                 goto out;
1154         X25_SKB_CB(skb)->flags = msg->msg_flags;
1155
1156         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1157
1158         /*
1159          *      Put the data on the end
1160          */
1161         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1162
1163         skb_reset_transport_header(skb);
1164         skb_put(skb, len);
1165
1166         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1167         if (rc)
1168                 goto out_kfree_skb;
1169
1170         /*
1171          *      If the Q BIT Include socket option is in force, the first
1172          *      byte of the user data is the logical value of the Q Bit.
1173          */
1174         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1175                 qbit = skb->data[0];
1176                 skb_pull(skb, 1);
1177         }
1178
1179         /*
1180          *      Push down the X.25 header
1181          */
1182         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1183
1184         if (msg->msg_flags & MSG_OOB) {
1185                 if (x25->neighbour->extended) {
1186                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1187                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1188                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1189                         *asmptr++ = X25_INTERRUPT;
1190                 } else {
1191                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1192                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1193                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1194                         *asmptr++ = X25_INTERRUPT;
1195                 }
1196         } else {
1197                 if (x25->neighbour->extended) {
1198                         /* Build an Extended X.25 header */
1199                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1200                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1201                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1202                         *asmptr++ = X25_DATA;
1203                         *asmptr++ = X25_DATA;
1204                 } else {
1205                         /* Build an Standard X.25 header */
1206                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1207                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1208                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1209                         *asmptr++ = X25_DATA;
1210                 }
1211
1212                 if (qbit)
1213                         skb->data[0] |= X25_Q_BIT;
1214         }
1215
1216         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1217         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1218
1219         rc = -ENOTCONN;
1220         if (sk->sk_state != TCP_ESTABLISHED)
1221                 goto out_kfree_skb;
1222
1223         if (msg->msg_flags & MSG_OOB)
1224                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1225         else {
1226                 rc = x25_output(sk, skb);
1227                 len = rc;
1228                 if (rc < 0)
1229                         kfree_skb(skb);
1230                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1231                         len++;
1232         }
1233
1234         /*
1235          * lock_sock() is currently only used to serialize this x25_kick()
1236          * against input-driven x25_kick() calls. It currently only blocks
1237          * incoming packets for this socket and does not protect against
1238          * any other socket state changes and is not called from anywhere
1239          * else. As x25_kick() cannot block and as long as all socket
1240          * operations are BKL-wrapped, we don't need take to care about
1241          * purging the backlog queue in x25_release().
1242          *
1243          * Using lock_sock() to protect all socket operations entirely
1244          * (and making the whole x25 stack SMP aware) unfortunately would
1245          * require major changes to {send,recv}msg and skb allocation methods.
1246          * -> 2.5 ;)
1247          */
1248         lock_sock(sk);
1249         x25_kick(sk);
1250         release_sock(sk);
1251         rc = len;
1252 out:
1253         unlock_kernel();
1254         return rc;
1255 out_kfree_skb:
1256         kfree_skb(skb);
1257         goto out;
1258 }
1259
1260
1261 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1262                        struct msghdr *msg, size_t size,
1263                        int flags)
1264 {
1265         struct sock *sk = sock->sk;
1266         struct x25_sock *x25 = x25_sk(sk);
1267         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1268         size_t copied;
1269         int qbit;
1270         struct sk_buff *skb;
1271         unsigned char *asmptr;
1272         int rc = -ENOTCONN;
1273
1274         lock_kernel();
1275         /*
1276          * This works for seqpacket too. The receiver has ordered the queue for
1277          * us! We do one quick check first though
1278          */
1279         if (sk->sk_state != TCP_ESTABLISHED)
1280                 goto out;
1281
1282         if (flags & MSG_OOB) {
1283                 rc = -EINVAL;
1284                 if (sock_flag(sk, SOCK_URGINLINE) ||
1285                     !skb_peek(&x25->interrupt_in_queue))
1286                         goto out;
1287
1288                 skb = skb_dequeue(&x25->interrupt_in_queue);
1289
1290                 skb_pull(skb, X25_STD_MIN_LEN);
1291
1292                 /*
1293                  *      No Q bit information on Interrupt data.
1294                  */
1295                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1296                         asmptr  = skb_push(skb, 1);
1297                         *asmptr = 0x00;
1298                 }
1299
1300                 msg->msg_flags |= MSG_OOB;
1301         } else {
1302                 /* Now we can treat all alike */
1303                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1304                                         flags & MSG_DONTWAIT, &rc);
1305                 if (!skb)
1306                         goto out;
1307
1308                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1309
1310                 skb_pull(skb, x25->neighbour->extended ?
1311                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1312
1313                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1314                         asmptr  = skb_push(skb, 1);
1315                         *asmptr = qbit;
1316                 }
1317         }
1318
1319         skb_reset_transport_header(skb);
1320         copied = skb->len;
1321
1322         if (copied > size) {
1323                 copied = size;
1324                 msg->msg_flags |= MSG_TRUNC;
1325         }
1326
1327         /* Currently, each datagram always contains a complete record */
1328         msg->msg_flags |= MSG_EOR;
1329
1330         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1331         if (rc)
1332                 goto out_free_dgram;
1333
1334         if (sx25) {
1335                 sx25->sx25_family = AF_X25;
1336                 sx25->sx25_addr   = x25->dest_addr;
1337         }
1338
1339         msg->msg_namelen = sizeof(struct sockaddr_x25);
1340
1341         lock_sock(sk);
1342         x25_check_rbuf(sk);
1343         release_sock(sk);
1344         rc = copied;
1345 out_free_dgram:
1346         skb_free_datagram(sk, skb);
1347 out:
1348         unlock_kernel();
1349         return rc;
1350 }
1351
1352
1353 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1354 {
1355         struct sock *sk = sock->sk;
1356         struct x25_sock *x25 = x25_sk(sk);
1357         void __user *argp = (void __user *)arg;
1358         int rc;
1359
1360         switch (cmd) {
1361                 case TIOCOUTQ: {
1362                         int amount;
1363
1364                         amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1365                         if (amount < 0)
1366                                 amount = 0;
1367                         rc = put_user(amount, (unsigned int __user *)argp);
1368                         break;
1369                 }
1370
1371                 case TIOCINQ: {
1372                         struct sk_buff *skb;
1373                         int amount = 0;
1374                         /*
1375                          * These two are safe on a single CPU system as
1376                          * only user tasks fiddle here
1377                          */
1378                         lock_sock(sk);
1379                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1380                                 amount = skb->len;
1381                         release_sock(sk);
1382                         rc = put_user(amount, (unsigned int __user *)argp);
1383                         break;
1384                 }
1385
1386                 case SIOCGSTAMP:
1387                         rc = -EINVAL;
1388                         if (sk)
1389                                 rc = sock_get_timestamp(sk,
1390                                                 (struct timeval __user *)argp);
1391                         break;
1392                 case SIOCGSTAMPNS:
1393                         rc = -EINVAL;
1394                         if (sk)
1395                                 rc = sock_get_timestampns(sk,
1396                                                 (struct timespec __user *)argp);
1397                         break;
1398                 case SIOCGIFADDR:
1399                 case SIOCSIFADDR:
1400                 case SIOCGIFDSTADDR:
1401                 case SIOCSIFDSTADDR:
1402                 case SIOCGIFBRDADDR:
1403                 case SIOCSIFBRDADDR:
1404                 case SIOCGIFNETMASK:
1405                 case SIOCSIFNETMASK:
1406                 case SIOCGIFMETRIC:
1407                 case SIOCSIFMETRIC:
1408                         rc = -EINVAL;
1409                         break;
1410                 case SIOCADDRT:
1411                 case SIOCDELRT:
1412                         rc = -EPERM;
1413                         if (!capable(CAP_NET_ADMIN))
1414                                 break;
1415                         rc = x25_route_ioctl(cmd, argp);
1416                         break;
1417                 case SIOCX25GSUBSCRIP:
1418                         rc = x25_subscr_ioctl(cmd, argp);
1419                         break;
1420                 case SIOCX25SSUBSCRIP:
1421                         rc = -EPERM;
1422                         if (!capable(CAP_NET_ADMIN))
1423                                 break;
1424                         rc = x25_subscr_ioctl(cmd, argp);
1425                         break;
1426                 case SIOCX25GFACILITIES: {
1427                         lock_sock(sk);
1428                         rc = copy_to_user(argp, &x25->facilities,
1429                                                 sizeof(x25->facilities))
1430                                                 ? -EFAULT : 0;
1431                         release_sock(sk);
1432                         break;
1433                 }
1434
1435                 case SIOCX25SFACILITIES: {
1436                         struct x25_facilities facilities;
1437                         rc = -EFAULT;
1438                         if (copy_from_user(&facilities, argp,
1439                                            sizeof(facilities)))
1440                                 break;
1441                         rc = -EINVAL;
1442                         lock_sock(sk);
1443                         if (sk->sk_state != TCP_LISTEN &&
1444                             sk->sk_state != TCP_CLOSE)
1445                                 goto out_fac_release;
1446                         if (facilities.pacsize_in < X25_PS16 ||
1447                             facilities.pacsize_in > X25_PS4096)
1448                                 goto out_fac_release;
1449                         if (facilities.pacsize_out < X25_PS16 ||
1450                             facilities.pacsize_out > X25_PS4096)
1451                                 goto out_fac_release;
1452                         if (facilities.winsize_in < 1 ||
1453                             facilities.winsize_in > 127)
1454                                 goto out_fac_release;
1455                         if (facilities.throughput) {
1456                                 int out = facilities.throughput & 0xf0;
1457                                 int in  = facilities.throughput & 0x0f;
1458                                 if (!out)
1459                                         facilities.throughput |=
1460                                                 X25_DEFAULT_THROUGHPUT << 4;
1461                                 else if (out < 0x30 || out > 0xD0)
1462                                         goto out_fac_release;
1463                                 if (!in)
1464                                         facilities.throughput |=
1465                                                 X25_DEFAULT_THROUGHPUT;
1466                                 else if (in < 0x03 || in > 0x0D)
1467                                         goto out_fac_release;
1468                         }
1469                         if (facilities.reverse &&
1470                                 (facilities.reverse & 0x81) != 0x81)
1471                                 goto out_fac_release;
1472                         x25->facilities = facilities;
1473                         rc = 0;
1474 out_fac_release:
1475                         release_sock(sk);
1476                         break;
1477                 }
1478
1479                 case SIOCX25GDTEFACILITIES: {
1480                         lock_sock(sk);
1481                         rc = copy_to_user(argp, &x25->dte_facilities,
1482                                                 sizeof(x25->dte_facilities));
1483                         release_sock(sk);
1484                         if (rc)
1485                                 rc = -EFAULT;
1486                         break;
1487                 }
1488
1489                 case SIOCX25SDTEFACILITIES: {
1490                         struct x25_dte_facilities dtefacs;
1491                         rc = -EFAULT;
1492                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1493                                 break;
1494                         rc = -EINVAL;
1495                         lock_sock(sk);
1496                         if (sk->sk_state != TCP_LISTEN &&
1497                                         sk->sk_state != TCP_CLOSE)
1498                                 goto out_dtefac_release;
1499                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1500                                 goto out_dtefac_release;
1501                         if (dtefacs.calling_ae == NULL)
1502                                 goto out_dtefac_release;
1503                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1504                                 goto out_dtefac_release;
1505                         if (dtefacs.called_ae == NULL)
1506                                 goto out_dtefac_release;
1507                         x25->dte_facilities = dtefacs;
1508                         rc = 0;
1509 out_dtefac_release:
1510                         release_sock(sk);
1511                         break;
1512                 }
1513
1514                 case SIOCX25GCALLUSERDATA: {
1515                         lock_sock(sk);
1516                         rc = copy_to_user(argp, &x25->calluserdata,
1517                                         sizeof(x25->calluserdata))
1518                                         ? -EFAULT : 0;
1519                         release_sock(sk);
1520                         break;
1521                 }
1522
1523                 case SIOCX25SCALLUSERDATA: {
1524                         struct x25_calluserdata calluserdata;
1525
1526                         rc = -EFAULT;
1527                         if (copy_from_user(&calluserdata, argp,
1528                                            sizeof(calluserdata)))
1529                                 break;
1530                         rc = -EINVAL;
1531                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1532                                 break;
1533                         lock_sock(sk);
1534                         x25->calluserdata = calluserdata;
1535                         release_sock(sk);
1536                         rc = 0;
1537                         break;
1538                 }
1539
1540                 case SIOCX25GCAUSEDIAG: {
1541                         lock_sock(sk);
1542                         rc = copy_to_user(argp, &x25->causediag,
1543                                         sizeof(x25->causediag))
1544                                         ? -EFAULT : 0;
1545                         release_sock(sk);
1546                         break;
1547                 }
1548
1549                 case SIOCX25SCAUSEDIAG: {
1550                         struct x25_causediag causediag;
1551                         rc = -EFAULT;
1552                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1553                                 break;
1554                         lock_sock(sk);
1555                         x25->causediag = causediag;
1556                         release_sock(sk);
1557                         rc = 0;
1558                         break;
1559
1560                 }
1561
1562                 case SIOCX25SCUDMATCHLEN: {
1563                         struct x25_subaddr sub_addr;
1564                         rc = -EINVAL;
1565                         lock_sock(sk);
1566                         if(sk->sk_state != TCP_CLOSE)
1567                                 goto out_cud_release;
1568                         rc = -EFAULT;
1569                         if (copy_from_user(&sub_addr, argp,
1570                                         sizeof(sub_addr)))
1571                                 goto out_cud_release;
1572                         rc = -EINVAL;
1573                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1574                                 goto out_cud_release;
1575                         x25->cudmatchlength = sub_addr.cudmatchlength;
1576                         rc = 0;
1577 out_cud_release:
1578                         release_sock(sk);
1579                         break;
1580                 }
1581
1582                 case SIOCX25CALLACCPTAPPRV: {
1583                         rc = -EINVAL;
1584                         lock_kernel();
1585                         if (sk->sk_state != TCP_CLOSE)
1586                                 break;
1587                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1588                         unlock_kernel();
1589                         rc = 0;
1590                         break;
1591                 }
1592
1593                 case SIOCX25SENDCALLACCPT:  {
1594                         rc = -EINVAL;
1595                         lock_kernel();
1596                         if (sk->sk_state != TCP_ESTABLISHED)
1597                                 break;
1598                         /* must call accptapprv above */
1599                         if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1600                                 break;
1601                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1602                         x25->state = X25_STATE_3;
1603                         unlock_kernel();
1604                         rc = 0;
1605                         break;
1606                 }
1607
1608                 default:
1609                         rc = -ENOIOCTLCMD;
1610                         break;
1611         }
1612
1613         return rc;
1614 }
1615
1616 static const struct net_proto_family x25_family_ops = {
1617         .family =       AF_X25,
1618         .create =       x25_create,
1619         .owner  =       THIS_MODULE,
1620 };
1621
1622 #ifdef CONFIG_COMPAT
1623 static int compat_x25_subscr_ioctl(unsigned int cmd,
1624                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1625 {
1626         struct compat_x25_subscrip_struct x25_subscr;
1627         struct x25_neigh *nb;
1628         struct net_device *dev;
1629         int rc = -EINVAL;
1630
1631         rc = -EFAULT;
1632         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1633                 goto out;
1634
1635         rc = -EINVAL;
1636         dev = x25_dev_get(x25_subscr.device);
1637         if (dev == NULL)
1638                 goto out;
1639
1640         nb = x25_get_neigh(dev);
1641         if (nb == NULL)
1642                 goto out_dev_put;
1643
1644         dev_put(dev);
1645
1646         if (cmd == SIOCX25GSUBSCRIP) {
1647                 read_lock_bh(&x25_neigh_list_lock);
1648                 x25_subscr.extended = nb->extended;
1649                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1650                 read_unlock_bh(&x25_neigh_list_lock);
1651                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1652                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1653         } else {
1654                 rc = -EINVAL;
1655                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1656                         rc = 0;
1657                         write_lock_bh(&x25_neigh_list_lock);
1658                         nb->extended = x25_subscr.extended;
1659                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1660                         write_unlock_bh(&x25_neigh_list_lock);
1661                 }
1662         }
1663         x25_neigh_put(nb);
1664 out:
1665         return rc;
1666 out_dev_put:
1667         dev_put(dev);
1668         goto out;
1669 }
1670
1671 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1672                                 unsigned long arg)
1673 {
1674         void __user *argp = compat_ptr(arg);
1675         struct sock *sk = sock->sk;
1676
1677         int rc = -ENOIOCTLCMD;
1678
1679         switch(cmd) {
1680         case TIOCOUTQ:
1681         case TIOCINQ:
1682                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1683                 break;
1684         case SIOCGSTAMP:
1685                 rc = -EINVAL;
1686                 if (sk)
1687                         rc = compat_sock_get_timestamp(sk,
1688                                         (struct timeval __user*)argp);
1689                 break;
1690         case SIOCGSTAMPNS:
1691                 rc = -EINVAL;
1692                 if (sk)
1693                         rc = compat_sock_get_timestampns(sk,
1694                                         (struct timespec __user*)argp);
1695                 break;
1696         case SIOCGIFADDR:
1697         case SIOCSIFADDR:
1698         case SIOCGIFDSTADDR:
1699         case SIOCSIFDSTADDR:
1700         case SIOCGIFBRDADDR:
1701         case SIOCSIFBRDADDR:
1702         case SIOCGIFNETMASK:
1703         case SIOCSIFNETMASK:
1704         case SIOCGIFMETRIC:
1705         case SIOCSIFMETRIC:
1706                 rc = -EINVAL;
1707                 break;
1708         case SIOCADDRT:
1709         case SIOCDELRT:
1710                 rc = -EPERM;
1711                 if (!capable(CAP_NET_ADMIN))
1712                         break;
1713                 rc = x25_route_ioctl(cmd, argp);
1714                 break;
1715         case SIOCX25GSUBSCRIP:
1716                 rc = compat_x25_subscr_ioctl(cmd, argp);
1717                 break;
1718         case SIOCX25SSUBSCRIP:
1719                 rc = -EPERM;
1720                 if (!capable(CAP_NET_ADMIN))
1721                         break;
1722                 rc = compat_x25_subscr_ioctl(cmd, argp);
1723                 break;
1724         case SIOCX25GFACILITIES:
1725         case SIOCX25SFACILITIES:
1726         case SIOCX25GDTEFACILITIES:
1727         case SIOCX25SDTEFACILITIES:
1728         case SIOCX25GCALLUSERDATA:
1729         case SIOCX25SCALLUSERDATA:
1730         case SIOCX25GCAUSEDIAG:
1731         case SIOCX25SCAUSEDIAG:
1732         case SIOCX25SCUDMATCHLEN:
1733         case SIOCX25CALLACCPTAPPRV:
1734         case SIOCX25SENDCALLACCPT:
1735                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1736                 break;
1737         default:
1738                 rc = -ENOIOCTLCMD;
1739                 break;
1740         }
1741         return rc;
1742 }
1743 #endif
1744
1745 static const struct proto_ops x25_proto_ops = {
1746         .family =       AF_X25,
1747         .owner =        THIS_MODULE,
1748         .release =      x25_release,
1749         .bind =         x25_bind,
1750         .connect =      x25_connect,
1751         .socketpair =   sock_no_socketpair,
1752         .accept =       x25_accept,
1753         .getname =      x25_getname,
1754         .poll =         datagram_poll,
1755         .ioctl =        x25_ioctl,
1756 #ifdef CONFIG_COMPAT
1757         .compat_ioctl = compat_x25_ioctl,
1758 #endif
1759         .listen =       x25_listen,
1760         .shutdown =     sock_no_shutdown,
1761         .setsockopt =   x25_setsockopt,
1762         .getsockopt =   x25_getsockopt,
1763         .sendmsg =      x25_sendmsg,
1764         .recvmsg =      x25_recvmsg,
1765         .mmap =         sock_no_mmap,
1766         .sendpage =     sock_no_sendpage,
1767 };
1768
1769 static struct packet_type x25_packet_type __read_mostly = {
1770         .type = cpu_to_be16(ETH_P_X25),
1771         .func = x25_lapb_receive_frame,
1772 };
1773
1774 static struct notifier_block x25_dev_notifier = {
1775         .notifier_call = x25_device_event,
1776 };
1777
1778 void x25_kill_by_neigh(struct x25_neigh *nb)
1779 {
1780         struct sock *s;
1781         struct hlist_node *node;
1782
1783         write_lock_bh(&x25_list_lock);
1784
1785         sk_for_each(s, node, &x25_list)
1786                 if (x25_sk(s)->neighbour == nb)
1787                         x25_disconnect(s, ENETUNREACH, 0, 0);
1788
1789         write_unlock_bh(&x25_list_lock);
1790
1791         /* Remove any related forwards */
1792         x25_clear_forward_by_dev(nb->dev);
1793 }
1794
1795 static int __init x25_init(void)
1796 {
1797         int rc = proto_register(&x25_proto, 0);
1798
1799         if (rc != 0)
1800                 goto out;
1801
1802         rc = sock_register(&x25_family_ops);
1803         if (rc != 0)
1804                 goto out_proto;
1805
1806         dev_add_pack(&x25_packet_type);
1807
1808         rc = register_netdevice_notifier(&x25_dev_notifier);
1809         if (rc != 0)
1810                 goto out_sock;
1811
1812         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1813
1814         x25_register_sysctl();
1815         rc = x25_proc_init();
1816         if (rc != 0)
1817                 goto out_dev;
1818 out:
1819         return rc;
1820 out_dev:
1821         unregister_netdevice_notifier(&x25_dev_notifier);
1822 out_sock:
1823         sock_unregister(AF_X25);
1824 out_proto:
1825         proto_unregister(&x25_proto);
1826         goto out;
1827 }
1828 module_init(x25_init);
1829
1830 static void __exit x25_exit(void)
1831 {
1832         x25_proc_exit();
1833         x25_link_free();
1834         x25_route_free();
1835
1836         x25_unregister_sysctl();
1837
1838         unregister_netdevice_notifier(&x25_dev_notifier);
1839
1840         dev_remove_pack(&x25_packet_type);
1841
1842         sock_unregister(AF_X25);
1843         proto_unregister(&x25_proto);
1844 }
1845 module_exit(x25_exit);
1846
1847 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1848 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1849 MODULE_LICENSE("GPL");
1850 MODULE_ALIAS_NETPROTO(PF_X25);