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_kernel();
 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         unlock_kernel();
 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         lock_kernel();
 692         if (!sock_flag(sk, SOCK_ZAPPED) ||
 693             addr_len != sizeof(struct sockaddr_x25) ||
 694             addr->sx25_family != AF_X25) {
 695                 rc = -EINVAL;
 696                 goto out;
 697         }
 698
 699         len = strlen(addr->sx25_addr.x25_addr);
 700         for (i = 0; i < len; i++) {
 701                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 702                         rc = -EINVAL;
 703                         goto out;
 704                 }
 705         }
 706
 707         x25_sk(sk)->source_addr = addr->sx25_addr;
 708         x25_insert_socket(sk);
 709         sock_reset_flag(sk, SOCK_ZAPPED);
 710         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 711 out:
 712         unlock_kernel();
 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_kernel();
 755         lock_sock(sk);
 756         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 757                 sock->state = SS_CONNECTED;
 758                 goto out; /* Connect completed during a ERESTARTSYS event */
 759         }
 760
 761         rc = -ECONNREFUSED;
 762         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 763                 sock->state = SS_UNCONNECTED;
 764                 goto out;
 765         }
 766
 767         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 768         if (sk->sk_state == TCP_ESTABLISHED)
 769                 goto out;
 770
 771         sk->sk_state   = TCP_CLOSE;
 772         sock->state = SS_UNCONNECTED;
 773
 774         rc = -EINVAL;
 775         if (addr_len != sizeof(struct sockaddr_x25) ||
 776             addr->sx25_family != AF_X25)
 777                 goto out;
 778
 779         rc = -ENETUNREACH;
 780         rt = x25_get_route(&addr->sx25_addr);
 781         if (!rt)
 782                 goto out;
 783
 784         x25->neighbour = x25_get_neigh(rt->dev);
 785         if (!x25->neighbour)
 786                 goto out_put_route;
 787
 788         x25_limit_facilities(&x25->facilities, x25->neighbour);
 789
 790         x25->lci = x25_new_lci(x25->neighbour);
 791         if (!x25->lci)
 792                 goto out_put_neigh;
 793
 794         rc = -EINVAL;
 795         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 796                 goto out_put_neigh;
 797
 798         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 799                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 800
 801         x25->dest_addr = addr->sx25_addr;
 802
 803         /* Move to connecting socket, start sending Connect Requests */
 804         sock->state   = SS_CONNECTING;
 805         sk->sk_state  = TCP_SYN_SENT;
 806
 807         x25->state = X25_STATE_1;
 808
 809         x25_write_internal(sk, X25_CALL_REQUEST);
 810
 811         x25_start_heartbeat(sk);
 812         x25_start_t21timer(sk);
 813
 814         /* Now the loop */
 815         rc = -EINPROGRESS;
 816         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 817                 goto out_put_neigh;
 818
 819         rc = x25_wait_for_connection_establishment(sk);
 820         if (rc)
 821                 goto out_put_neigh;
 822
 823         sock->state = SS_CONNECTED;
 824         rc = 0;
 825 out_put_neigh:
 826         if (rc)
 827                 x25_neigh_put(x25->neighbour);
 828 out_put_route:
 829         x25_route_put(rt);
 830 out:
 831         release_sock(sk);
 832         unlock_kernel();
 833         return rc;
 834 }
 835
 836 static int x25_wait_for_data(struct sock *sk, long timeout)
 837 {
 838         DECLARE_WAITQUEUE(wait, current);
 839         int rc = 0;
 840
 841         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 842         for (;;) {
 843                 __set_current_state(TASK_INTERRUPTIBLE);
 844                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 845                         break;
 846                 rc = -ERESTARTSYS;
 847                 if (signal_pending(current))
 848                         break;
 849                 rc = -EAGAIN;
 850                 if (!timeout)
 851                         break;
 852                 rc = 0;
 853                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 854                         release_sock(sk);
 855                         timeout = schedule_timeout(timeout);
 856                         lock_sock(sk);
 857                 } else
 858                         break;
 859         }
 860         __set_current_state(TASK_RUNNING);
 861         remove_wait_queue(sk_sleep(sk), &wait);
 862         return rc;
 863 }
 864
 865 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 866 {
 867         struct sock *sk = sock->sk;
 868         struct sock *newsk;
 869         struct sk_buff *skb;
 870         int rc = -EINVAL;
 871
 872         lock_kernel();
 873         if (!sk || sk->sk_state != TCP_LISTEN)
 874                 goto out;
 875
 876         rc = -EOPNOTSUPP;
 877         if (sk->sk_type != SOCK_SEQPACKET)
 878                 goto out;
 879
 880         lock_sock(sk);
 881         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 882         if (rc)
 883                 goto out2;
 884         skb = skb_dequeue(&sk->sk_receive_queue);
 885         rc = -EINVAL;
 886         if (!skb->sk)
 887                 goto out2;
 888         newsk            = skb->sk;
 889         sock_graft(newsk, newsock);
 890
 891         /* Now attach up the new socket */
 892         skb->sk = NULL;
 893         kfree_skb(skb);
 894         sk->sk_ack_backlog--;
 895         newsock->state = SS_CONNECTED;
 896         rc = 0;
 897 out2:
 898         release_sock(sk);
 899 out:
 900         unlock_kernel();
 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         lock_kernel();
 913         if (peer) {
 914                 if (sk->sk_state != TCP_ESTABLISHED) {
 915                         rc = -ENOTCONN;
 916                         goto out;
 917                 }
 918                 sx25->sx25_addr = x25->dest_addr;
 919         } else
 920                 sx25->sx25_addr = x25->source_addr;
 921
 922         sx25->sx25_family = AF_X25;
 923         *uaddr_len = sizeof(*sx25);
 924
 925 out:
 926         unlock_kernel();
 927         return rc;
 928 }
 929
 930 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
 931                            poll_table *wait)
 932 {
 933         int rc;
 934
 935         lock_kernel();
 936         rc = datagram_poll(file, sock, wait);
 937         unlock_kernel();
 938
 939         return rc;
 940 }
 941
 942 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 943                         unsigned int lci)
 944 {
 945         struct sock *sk;
 946         struct sock *make;
 947         struct x25_sock *makex25;
 948         struct x25_address source_addr, dest_addr;
 949         struct x25_facilities facilities;
 950         struct x25_dte_facilities dte_facilities;
 951         int len, addr_len, rc;
 952
 953         /*
 954          *      Remove the LCI and frame type.
 955          */
 956         skb_pull(skb, X25_STD_MIN_LEN);
 957
 958         /*
 959          *      Extract the X.25 addresses and convert them to ASCII strings,
 960          *      and remove them.
 961          *
 962          *      Address block is mandatory in call request packets
 963          */
 964         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 965         if (addr_len <= 0)
 966                 goto out_clear_request;
 967         skb_pull(skb, addr_len);
 968
 969         /*
 970          *      Get the length of the facilities, skip past them for the moment
 971          *      get the call user data because this is needed to determine
 972          *      the correct listener
 973          *
 974          *      Facilities length is mandatory in call request packets
 975          */
 976         if (skb->len < 1)
 977                 goto out_clear_request;
 978         len = skb->data[0] + 1;
 979         if (skb->len < len)
 980                 goto out_clear_request;
 981         skb_pull(skb,len);
 982
 983         /*
 984          *      Find a listener for the particular address/cud pair.
 985          */
 986         sk = x25_find_listener(&source_addr,skb);
 987         skb_push(skb,len);
 988
 989         if (sk != NULL && sk_acceptq_is_full(sk)) {
 990                 goto out_sock_put;
 991         }
 992
 993         /*
 994          *      We dont have any listeners for this incoming call.
 995          *      Try forwarding it.
 996          */
 997         if (sk == NULL) {
 998                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 999                 if (sysctl_x25_forward &&
1000                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1001                 {
1002                         /* Call was forwarded, dont process it any more */
1003                         kfree_skb(skb);
1004                         rc = 1;
1005                         goto out;
1006                 } else {
1007                         /* No listeners, can't forward, clear the call */
1008                         goto out_clear_request;
1009                 }
1010         }
1011
1012         /*
1013          *      Try to reach a compromise on the requested facilities.
1014          */
1015         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1016         if (len == -1)
1017                 goto out_sock_put;
1018
1019         /*
1020          * current neighbour/link might impose additional limits
1021          * on certain facilties
1022          */
1023
1024         x25_limit_facilities(&facilities, nb);
1025
1026         /*
1027          *      Try to create a new socket.
1028          */
1029         make = x25_make_new(sk);
1030         if (!make)
1031                 goto out_sock_put;
1032
1033         /*
1034          *      Remove the facilities
1035          */
1036         skb_pull(skb, len);
1037
1038         skb->sk     = make;
1039         make->sk_state = TCP_ESTABLISHED;
1040
1041         makex25 = x25_sk(make);
1042         makex25->lci           = lci;
1043         makex25->dest_addr     = dest_addr;
1044         makex25->source_addr   = source_addr;
1045         makex25->neighbour     = nb;
1046         makex25->facilities    = facilities;
1047         makex25->dte_facilities= dte_facilities;
1048         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1049         /* ensure no reverse facil on accept */
1050         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1051         /* ensure no calling address extension on accept */
1052         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1053         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1054
1055         /* Normally all calls are accepted immediately */
1056         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1057                 x25_write_internal(make, X25_CALL_ACCEPTED);
1058                 makex25->state = X25_STATE_3;
1059         }
1060
1061         /*
1062          *      Incoming Call User Data.
1063          */
1064         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1065         makex25->calluserdata.cudlength = skb->len;
1066
1067         sk->sk_ack_backlog++;
1068
1069         x25_insert_socket(make);
1070
1071         skb_queue_head(&sk->sk_receive_queue, skb);
1072
1073         x25_start_heartbeat(make);
1074
1075         if (!sock_flag(sk, SOCK_DEAD))
1076                 sk->sk_data_ready(sk, skb->len);
1077         rc = 1;
1078         sock_put(sk);
1079 out:
1080         return rc;
1081 out_sock_put:
1082         sock_put(sk);
1083 out_clear_request:
1084         rc = 0;
1085         x25_transmit_clear_request(nb, lci, 0x01);
1086         goto out;
1087 }
1088
1089 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1090                        struct msghdr *msg, size_t len)
1091 {
1092         struct sock *sk = sock->sk;
1093         struct x25_sock *x25 = x25_sk(sk);
1094         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1095         struct sockaddr_x25 sx25;
1096         struct sk_buff *skb;
1097         unsigned char *asmptr;
1098         int noblock = msg->msg_flags & MSG_DONTWAIT;
1099         size_t size;
1100         int qbit = 0, rc = -EINVAL;
1101
1102         lock_kernel();
1103         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1104                 goto out;
1105
1106         /* we currently don't support segmented records at the user interface */
1107         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1108                 goto out;
1109
1110         rc = -EADDRNOTAVAIL;
1111         if (sock_flag(sk, SOCK_ZAPPED))
1112                 goto out;
1113
1114         rc = -EPIPE;
1115         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1116                 send_sig(SIGPIPE, current, 0);
1117                 goto out;
1118         }
1119
1120         rc = -ENETUNREACH;
1121         if (!x25->neighbour)
1122                 goto out;
1123
1124         if (usx25) {
1125                 rc = -EINVAL;
1126                 if (msg->msg_namelen < sizeof(sx25))
1127                         goto out;
1128                 memcpy(&sx25, usx25, sizeof(sx25));
1129                 rc = -EISCONN;
1130                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1131                         goto out;
1132                 rc = -EINVAL;
1133                 if (sx25.sx25_family != AF_X25)
1134                         goto out;
1135         } else {
1136                 /*
1137                  *      FIXME 1003.1g - if the socket is like this because
1138                  *      it has become closed (not started closed) we ought
1139                  *      to SIGPIPE, EPIPE;
1140                  */
1141                 rc = -ENOTCONN;
1142                 if (sk->sk_state != TCP_ESTABLISHED)
1143                         goto out;
1144
1145                 sx25.sx25_family = AF_X25;
1146                 sx25.sx25_addr   = x25->dest_addr;
1147         }
1148
1149         /* Sanity check the packet size */
1150         if (len > 65535) {
1151                 rc = -EMSGSIZE;
1152                 goto out;
1153         }
1154
1155         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1156
1157         /* Build a packet */
1158         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1159
1160         if ((msg->msg_flags & MSG_OOB) && len > 32)
1161                 len = 32;
1162
1163         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1164
1165         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1166         if (!skb)
1167                 goto out;
1168         X25_SKB_CB(skb)->flags = msg->msg_flags;
1169
1170         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1171
1172         /*
1173          *      Put the data on the end
1174          */
1175         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1176
1177         skb_reset_transport_header(skb);
1178         skb_put(skb, len);
1179
1180         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1181         if (rc)
1182                 goto out_kfree_skb;
1183
1184         /*
1185          *      If the Q BIT Include socket option is in force, the first
1186          *      byte of the user data is the logical value of the Q Bit.
1187          */
1188         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1189                 qbit = skb->data[0];
1190                 skb_pull(skb, 1);
1191         }
1192
1193         /*
1194          *      Push down the X.25 header
1195          */
1196         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1197
1198         if (msg->msg_flags & MSG_OOB) {
1199                 if (x25->neighbour->extended) {
1200                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1201                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1202                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1203                         *asmptr++ = X25_INTERRUPT;
1204                 } else {
1205                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1206                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1207                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1208                         *asmptr++ = X25_INTERRUPT;
1209                 }
1210         } else {
1211                 if (x25->neighbour->extended) {
1212                         /* Build an Extended X.25 header */
1213                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1214                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1215                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1216                         *asmptr++ = X25_DATA;
1217                         *asmptr++ = X25_DATA;
1218                 } else {
1219                         /* Build an Standard X.25 header */
1220                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1221                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1222                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1223                         *asmptr++ = X25_DATA;
1224                 }
1225
1226                 if (qbit)
1227                         skb->data[0] |= X25_Q_BIT;
1228         }
1229
1230         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1231         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1232
1233         rc = -ENOTCONN;
1234         if (sk->sk_state != TCP_ESTABLISHED)
1235                 goto out_kfree_skb;
1236
1237         if (msg->msg_flags & MSG_OOB)
1238                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1239         else {
1240                 rc = x25_output(sk, skb);
1241                 len = rc;
1242                 if (rc < 0)
1243                         kfree_skb(skb);
1244                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1245                         len++;
1246         }
1247
1248         /*
1249          * lock_sock() is currently only used to serialize this x25_kick()
1250          * against input-driven x25_kick() calls. It currently only blocks
1251          * incoming packets for this socket and does not protect against
1252          * any other socket state changes and is not called from anywhere
1253          * else. As x25_kick() cannot block and as long as all socket
1254          * operations are BKL-wrapped, we don't need take to care about
1255          * purging the backlog queue in x25_release().
1256          *
1257          * Using lock_sock() to protect all socket operations entirely
1258          * (and making the whole x25 stack SMP aware) unfortunately would
1259          * require major changes to {send,recv}msg and skb allocation methods.
1260          * -> 2.5 ;)
1261          */
1262         lock_sock(sk);
1263         x25_kick(sk);
1264         release_sock(sk);
1265         rc = len;
1266 out:
1267         unlock_kernel();
1268         return rc;
1269 out_kfree_skb:
1270         kfree_skb(skb);
1271         goto out;
1272 }
1273
1274
1275 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1276                        struct msghdr *msg, size_t size,
1277                        int flags)
1278 {
1279         struct sock *sk = sock->sk;
1280         struct x25_sock *x25 = x25_sk(sk);
1281         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1282         size_t copied;
1283         int qbit;
1284         struct sk_buff *skb;
1285         unsigned char *asmptr;
1286         int rc = -ENOTCONN;
1287
1288         lock_kernel();
1289         /*
1290          * This works for seqpacket too. The receiver has ordered the queue for
1291          * us! We do one quick check first though
1292          */
1293         if (sk->sk_state != TCP_ESTABLISHED)
1294                 goto out;
1295
1296         if (flags & MSG_OOB) {
1297                 rc = -EINVAL;
1298                 if (sock_flag(sk, SOCK_URGINLINE) ||
1299                     !skb_peek(&x25->interrupt_in_queue))
1300                         goto out;
1301
1302                 skb = skb_dequeue(&x25->interrupt_in_queue);
1303
1304                 skb_pull(skb, X25_STD_MIN_LEN);
1305
1306                 /*
1307                  *      No Q bit information on Interrupt data.
1308                  */
1309                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1310                         asmptr  = skb_push(skb, 1);
1311                         *asmptr = 0x00;
1312                 }
1313
1314                 msg->msg_flags |= MSG_OOB;
1315         } else {
1316                 /* Now we can treat all alike */
1317                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1318                                         flags & MSG_DONTWAIT, &rc);
1319                 if (!skb)
1320                         goto out;
1321
1322                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1323
1324                 skb_pull(skb, x25->neighbour->extended ?
1325                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1326
1327                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1328                         asmptr  = skb_push(skb, 1);
1329                         *asmptr = qbit;
1330                 }
1331         }
1332
1333         skb_reset_transport_header(skb);
1334         copied = skb->len;
1335
1336         if (copied > size) {
1337                 copied = size;
1338                 msg->msg_flags |= MSG_TRUNC;
1339         }
1340
1341         /* Currently, each datagram always contains a complete record */
1342         msg->msg_flags |= MSG_EOR;
1343
1344         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1345         if (rc)
1346                 goto out_free_dgram;
1347
1348         if (sx25) {
1349                 sx25->sx25_family = AF_X25;
1350                 sx25->sx25_addr   = x25->dest_addr;
1351         }
1352
1353         msg->msg_namelen = sizeof(struct sockaddr_x25);
1354
1355         lock_sock(sk);
1356         x25_check_rbuf(sk);
1357         release_sock(sk);
1358         rc = copied;
1359 out_free_dgram:
1360         skb_free_datagram(sk, skb);
1361 out:
1362         unlock_kernel();
1363         return rc;
1364 }
1365
1366
1367 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1368 {
1369         struct sock *sk = sock->sk;
1370         struct x25_sock *x25 = x25_sk(sk);
1371         void __user *argp = (void __user *)arg;
1372         int rc;
1373
1374         lock_kernel();
1375         switch (cmd) {
1376                 case TIOCOUTQ: {
1377                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1378
1379                         if (amount < 0)
1380                                 amount = 0;
1381                         rc = put_user(amount, (unsigned int __user *)argp);
1382                         break;
1383                 }
1384
1385                 case TIOCINQ: {
1386                         struct sk_buff *skb;
1387                         int amount = 0;
1388                         /*
1389                          * These two are safe on a single CPU system as
1390                          * only user tasks fiddle here
1391                          */
1392                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1393                                 amount = skb->len;
1394                         rc = put_user(amount, (unsigned int __user *)argp);
1395                         break;
1396                 }
1397
1398                 case SIOCGSTAMP:
1399                         rc = -EINVAL;
1400                         if (sk)
1401                                 rc = sock_get_timestamp(sk,
1402                                                 (struct timeval __user *)argp);
1403                         break;
1404                 case SIOCGSTAMPNS:
1405                         rc = -EINVAL;
1406                         if (sk)
1407                                 rc = sock_get_timestampns(sk,
1408                                                 (struct timespec __user *)argp);
1409                         break;
1410                 case SIOCGIFADDR:
1411                 case SIOCSIFADDR:
1412                 case SIOCGIFDSTADDR:
1413                 case SIOCSIFDSTADDR:
1414                 case SIOCGIFBRDADDR:
1415                 case SIOCSIFBRDADDR:
1416                 case SIOCGIFNETMASK:
1417                 case SIOCSIFNETMASK:
1418                 case SIOCGIFMETRIC:
1419                 case SIOCSIFMETRIC:
1420                         rc = -EINVAL;
1421                         break;
1422                 case SIOCADDRT:
1423                 case SIOCDELRT:
1424                         rc = -EPERM;
1425                         if (!capable(CAP_NET_ADMIN))
1426                                 break;
1427                         rc = x25_route_ioctl(cmd, argp);
1428                         break;
1429                 case SIOCX25GSUBSCRIP:
1430                         rc = x25_subscr_ioctl(cmd, argp);
1431                         break;
1432                 case SIOCX25SSUBSCRIP:
1433                         rc = -EPERM;
1434                         if (!capable(CAP_NET_ADMIN))
1435                                 break;
1436                         rc = x25_subscr_ioctl(cmd, argp);
1437                         break;
1438                 case SIOCX25GFACILITIES: {
1439                         struct x25_facilities fac = x25->facilities;
1440                         rc = copy_to_user(argp, &fac,
1441                                           sizeof(fac)) ? -EFAULT : 0;
1442                         break;
1443                 }
1444
1445                 case SIOCX25SFACILITIES: {
1446                         struct x25_facilities facilities;
1447                         rc = -EFAULT;
1448                         if (copy_from_user(&facilities, argp,
1449                                            sizeof(facilities)))
1450                                 break;
1451                         rc = -EINVAL;
1452                         if (sk->sk_state != TCP_LISTEN &&
1453                             sk->sk_state != TCP_CLOSE)
1454                                 break;
1455                         if (facilities.pacsize_in < X25_PS16 ||
1456                             facilities.pacsize_in > X25_PS4096)
1457                                 break;
1458                         if (facilities.pacsize_out < X25_PS16 ||
1459                             facilities.pacsize_out > X25_PS4096)
1460                                 break;
1461                         if (facilities.winsize_in < 1 ||
1462                             facilities.winsize_in > 127)
1463                                 break;
1464                         if (facilities.throughput) {
1465                                 int out = facilities.throughput & 0xf0;
1466                                 int in  = facilities.throughput & 0x0f;
1467                                 if (!out)
1468                                         facilities.throughput |=
1469                                                 X25_DEFAULT_THROUGHPUT << 4;
1470                                 else if (out < 0x30 || out > 0xD0)
1471                                         break;
1472                                 if (!in)
1473                                         facilities.throughput |=
1474                                                 X25_DEFAULT_THROUGHPUT;
1475                                 else if (in < 0x03 || in > 0x0D)
1476                                         break;
1477                         }
1478                         if (facilities.reverse &&
1479                                 (facilities.reverse & 0x81) != 0x81)
1480                                 break;
1481                         x25->facilities = facilities;
1482                         rc = 0;
1483                         break;
1484                 }
1485
1486                 case SIOCX25GDTEFACILITIES: {
1487                         rc = copy_to_user(argp, &x25->dte_facilities,
1488                                                 sizeof(x25->dte_facilities));
1489                         if (rc)
1490                                 rc = -EFAULT;
1491                         break;
1492                 }
1493
1494                 case SIOCX25SDTEFACILITIES: {
1495                         struct x25_dte_facilities dtefacs;
1496                         rc = -EFAULT;
1497                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1498                                 break;
1499                         rc = -EINVAL;
1500                         if (sk->sk_state != TCP_LISTEN &&
1501                                         sk->sk_state != TCP_CLOSE)
1502                                 break;
1503                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1504                                 break;
1505                         if (dtefacs.calling_ae == NULL)
1506                                 break;
1507                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1508                                 break;
1509                         if (dtefacs.called_ae == NULL)
1510                                 break;
1511                         x25->dte_facilities = dtefacs;
1512                         rc = 0;
1513                         break;
1514                 }
1515
1516                 case SIOCX25GCALLUSERDATA: {
1517                         struct x25_calluserdata cud = x25->calluserdata;
1518                         rc = copy_to_user(argp, &cud,
1519                                           sizeof(cud)) ? -EFAULT : 0;
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                         x25->calluserdata = calluserdata;
1534                         rc = 0;
1535                         break;
1536                 }
1537
1538                 case SIOCX25GCAUSEDIAG: {
1539                         struct x25_causediag causediag;
1540                         causediag = x25->causediag;
1541                         rc = copy_to_user(argp, &causediag,
1542                                           sizeof(causediag)) ? -EFAULT : 0;
1543                         break;
1544                 }
1545
1546                 case SIOCX25SCAUSEDIAG: {
1547                         struct x25_causediag causediag;
1548                         rc = -EFAULT;
1549                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1550                                 break;
1551                         x25->causediag = causediag;
1552                         rc = 0;
1553                         break;
1554
1555                 }
1556
1557                 case SIOCX25SCUDMATCHLEN: {
1558                         struct x25_subaddr sub_addr;
1559                         rc = -EINVAL;
1560                         if(sk->sk_state != TCP_CLOSE)
1561                                 break;
1562                         rc = -EFAULT;
1563                         if (copy_from_user(&sub_addr, argp,
1564                                         sizeof(sub_addr)))
1565                                 break;
1566                         rc = -EINVAL;
1567                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1568                                 break;
1569                         x25->cudmatchlength = sub_addr.cudmatchlength;
1570                         rc = 0;
1571                         break;
1572                 }
1573
1574                 case SIOCX25CALLACCPTAPPRV: {
1575                         rc = -EINVAL;
1576                         if (sk->sk_state != TCP_CLOSE)
1577                                 break;
1578                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1579                         rc = 0;
1580                         break;
1581                 }
1582
1583                 case SIOCX25SENDCALLACCPT:  {
1584                         rc = -EINVAL;
1585                         if (sk->sk_state != TCP_ESTABLISHED)
1586                                 break;
1587                         /* must call accptapprv above */
1588                         if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1589                                 break;
1590                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1591                         x25->state = X25_STATE_3;
1592                         rc = 0;
1593                         break;
1594                 }
1595
1596                 default:
1597                         rc = -ENOIOCTLCMD;
1598                         break;
1599         }
1600         unlock_kernel();
1601
1602         return rc;
1603 }
1604
1605 static const struct net_proto_family x25_family_ops = {
1606         .family =       AF_X25,
1607         .create =       x25_create,
1608         .owner  =       THIS_MODULE,
1609 };
1610
1611 #ifdef CONFIG_COMPAT
1612 static int compat_x25_subscr_ioctl(unsigned int cmd,
1613                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1614 {
1615         struct compat_x25_subscrip_struct x25_subscr;
1616         struct x25_neigh *nb;
1617         struct net_device *dev;
1618         int rc = -EINVAL;
1619
1620         rc = -EFAULT;
1621         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1622                 goto out;
1623
1624         rc = -EINVAL;
1625         dev = x25_dev_get(x25_subscr.device);
1626         if (dev == NULL)
1627                 goto out;
1628
1629         nb = x25_get_neigh(dev);
1630         if (nb == NULL)
1631                 goto out_dev_put;
1632
1633         dev_put(dev);
1634
1635         if (cmd == SIOCX25GSUBSCRIP) {
1636                 x25_subscr.extended = nb->extended;
1637                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1638                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1639                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1640         } else {
1641                 rc = -EINVAL;
1642                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1643                         rc = 0;
1644                         nb->extended = x25_subscr.extended;
1645                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1646                 }
1647         }
1648         x25_neigh_put(nb);
1649 out:
1650         return rc;
1651 out_dev_put:
1652         dev_put(dev);
1653         goto out;
1654 }
1655
1656 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1657                                 unsigned long arg)
1658 {
1659         void __user *argp = compat_ptr(arg);
1660         struct sock *sk = sock->sk;
1661
1662         int rc = -ENOIOCTLCMD;
1663
1664         switch(cmd) {
1665         case TIOCOUTQ:
1666         case TIOCINQ:
1667                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1668                 break;
1669         case SIOCGSTAMP:
1670                 rc = -EINVAL;
1671                 lock_kernel();
1672                 if (sk)
1673                         rc = compat_sock_get_timestamp(sk,
1674                                         (struct timeval __user*)argp);
1675                 unlock_kernel();
1676                 break;
1677         case SIOCGSTAMPNS:
1678                 rc = -EINVAL;
1679                 lock_kernel();
1680                 if (sk)
1681                         rc = compat_sock_get_timestampns(sk,
1682                                         (struct timespec __user*)argp);
1683                 unlock_kernel();
1684                 break;
1685         case SIOCGIFADDR:
1686         case SIOCSIFADDR:
1687         case SIOCGIFDSTADDR:
1688         case SIOCSIFDSTADDR:
1689         case SIOCGIFBRDADDR:
1690         case SIOCSIFBRDADDR:
1691         case SIOCGIFNETMASK:
1692         case SIOCSIFNETMASK:
1693         case SIOCGIFMETRIC:
1694         case SIOCSIFMETRIC:
1695                 rc = -EINVAL;
1696                 break;
1697         case SIOCADDRT:
1698         case SIOCDELRT:
1699                 rc = -EPERM;
1700                 if (!capable(CAP_NET_ADMIN))
1701                         break;
1702                 lock_kernel();
1703                 rc = x25_route_ioctl(cmd, argp);
1704                 unlock_kernel();
1705                 break;
1706         case SIOCX25GSUBSCRIP:
1707                 lock_kernel();
1708                 rc = compat_x25_subscr_ioctl(cmd, argp);
1709                 unlock_kernel();
1710                 break;
1711         case SIOCX25SSUBSCRIP:
1712                 rc = -EPERM;
1713                 if (!capable(CAP_NET_ADMIN))
1714                         break;
1715                 lock_kernel();
1716                 rc = compat_x25_subscr_ioctl(cmd, argp);
1717                 unlock_kernel();
1718                 break;
1719         case SIOCX25GFACILITIES:
1720         case SIOCX25SFACILITIES:
1721         case SIOCX25GDTEFACILITIES:
1722         case SIOCX25SDTEFACILITIES:
1723         case SIOCX25GCALLUSERDATA:
1724         case SIOCX25SCALLUSERDATA:
1725         case SIOCX25GCAUSEDIAG:
1726         case SIOCX25SCAUSEDIAG:
1727         case SIOCX25SCUDMATCHLEN:
1728         case SIOCX25CALLACCPTAPPRV:
1729         case SIOCX25SENDCALLACCPT:
1730                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1731                 break;
1732         default:
1733                 rc = -ENOIOCTLCMD;
1734                 break;
1735         }
1736         return rc;
1737 }
1738 #endif
1739
1740 static const struct proto_ops x25_proto_ops = {
1741         .family =       AF_X25,
1742         .owner =        THIS_MODULE,
1743         .release =      x25_release,
1744         .bind =         x25_bind,
1745         .connect =      x25_connect,
1746         .socketpair =   sock_no_socketpair,
1747         .accept =       x25_accept,
1748         .getname =      x25_getname,
1749         .poll =         x25_datagram_poll,
1750         .ioctl =        x25_ioctl,
1751 #ifdef CONFIG_COMPAT
1752         .compat_ioctl = compat_x25_ioctl,
1753 #endif
1754         .listen =       x25_listen,
1755         .shutdown =     sock_no_shutdown,
1756         .setsockopt =   x25_setsockopt,
1757         .getsockopt =   x25_getsockopt,
1758         .sendmsg =      x25_sendmsg,
1759         .recvmsg =      x25_recvmsg,
1760         .mmap =         sock_no_mmap,
1761         .sendpage =     sock_no_sendpage,
1762 };
1763
1764 static struct packet_type x25_packet_type __read_mostly = {
1765         .type = cpu_to_be16(ETH_P_X25),
1766         .func = x25_lapb_receive_frame,
1767 };
1768
1769 static struct notifier_block x25_dev_notifier = {
1770         .notifier_call = x25_device_event,
1771 };
1772
1773 void x25_kill_by_neigh(struct x25_neigh *nb)
1774 {
1775         struct sock *s;
1776         struct hlist_node *node;
1777
1778         write_lock_bh(&x25_list_lock);
1779
1780         sk_for_each(s, node, &x25_list)
1781                 if (x25_sk(s)->neighbour == nb)
1782                         x25_disconnect(s, ENETUNREACH, 0, 0);
1783
1784         write_unlock_bh(&x25_list_lock);
1785
1786         /* Remove any related forwards */
1787         x25_clear_forward_by_dev(nb->dev);
1788 }
1789
1790 static int __init x25_init(void)
1791 {
1792         int rc = proto_register(&x25_proto, 0);
1793
1794         if (rc != 0)
1795                 goto out;
1796
1797         rc = sock_register(&x25_family_ops);
1798         if (rc != 0)
1799                 goto out_proto;
1800
1801         dev_add_pack(&x25_packet_type);
1802
1803         rc = register_netdevice_notifier(&x25_dev_notifier);
1804         if (rc != 0)
1805                 goto out_sock;
1806
1807         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1808
1809         x25_register_sysctl();
1810         rc = x25_proc_init();
1811         if (rc != 0)
1812                 goto out_dev;
1813 out:
1814         return rc;
1815 out_dev:
1816         unregister_netdevice_notifier(&x25_dev_notifier);
1817 out_sock:
1818         sock_unregister(AF_X25);
1819 out_proto:
1820         proto_unregister(&x25_proto);
1821         goto out;
1822 }
1823 module_init(x25_init);
1824
1825 static void __exit x25_exit(void)
1826 {
1827         x25_proc_exit();
1828         x25_link_free();
1829         x25_route_free();
1830
1831         x25_unregister_sysctl();
1832
1833         unregister_netdevice_notifier(&x25_dev_notifier);
1834
1835         dev_remove_pack(&x25_packet_type);
1836
1837         sock_unregister(AF_X25);
1838         proto_unregister(&x25_proto);
1839 }
1840 module_exit(x25_exit);
1841
1842 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1843 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1844 MODULE_LICENSE("GPL");
1845 MODULE_ALIAS_NETPROTO(PF_X25);