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 #define pr_fmt(fmt) "X25: " fmt
  39
  40 #include <linux/module.h>
  41 #include <linux/capability.h>
  42 #include <linux/errno.h>
  43 #include <linux/kernel.h>
  44 #include <linux/sched/signal.h>
  45 #include <linux/timer.h>
  46 #include <linux/string.h>
  47 #include <linux/net.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/if_arp.h>
  50 #include <linux/skbuff.h>
  51 #include <linux/slab.h>
  52 #include <net/sock.h>
  53 #include <net/tcp_states.h>
  54 #include <linux/uaccess.h>
  55 #include <linux/fcntl.h>
  56 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  57 #include <linux/notifier.h>
  58 #include <linux/init.h>
  59 #include <linux/compat.h>
  60 #include <linux/ctype.h>
  61
  62 #include <net/x25.h>
  63 #include <net/compat.h>
  64
  65 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  66 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  67 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  68 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  69 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  70 int sysctl_x25_forward                 = 0;
  71
  72 HLIST_HEAD(x25_list);
  73 DEFINE_RWLOCK(x25_list_lock);
  74
  75 static const struct proto_ops x25_proto_ops;
  76
  77 static const struct x25_address null_x25_address = {"               "};
  78
  79 #ifdef CONFIG_COMPAT
  80 struct compat_x25_subscrip_struct {
  81         char device[200-sizeof(compat_ulong_t)];
  82         compat_ulong_t global_facil_mask;
  83         compat_uint_t extended;
  84 };
  85 #endif
  86
  87
  88 int x25_parse_address_block(struct sk_buff *skb,
  89                 struct x25_address *called_addr,
  90                 struct x25_address *calling_addr)
  91 {
  92         unsigned char len;
  93         int needed;
  94         int rc;
  95
  96         if (!pskb_may_pull(skb, 1)) {
  97                 /* packet has no address block */
  98                 rc = 0;
  99                 goto empty;
 100         }
 101
 102         len = *skb->data;
 103         needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
 104
 105         if (!pskb_may_pull(skb, needed)) {
 106                 /* packet is too short to hold the addresses it claims
 107                    to hold */
 108                 rc = -1;
 109                 goto empty;
 110         }
 111
 112         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 113
 114 empty:
 115         *called_addr->x25_addr = 0;
 116         *calling_addr->x25_addr = 0;
 117
 118         return rc;
 119 }
 120
 121
 122 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 123                   struct x25_address *calling_addr)
 124 {
 125         unsigned int called_len, calling_len;
 126         char *called, *calling;
 127         unsigned int i;
 128
 129         called_len  = (*p >> 0) & 0x0F;
 130         calling_len = (*p >> 4) & 0x0F;
 131
 132         called  = called_addr->x25_addr;
 133         calling = calling_addr->x25_addr;
 134         p++;
 135
 136         for (i = 0; i < (called_len + calling_len); i++) {
 137                 if (i < called_len) {
 138                         if (i % 2 != 0) {
 139                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 140                                 p++;
 141                         } else {
 142                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 143                         }
 144                 } else {
 145                         if (i % 2 != 0) {
 146                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 147                                 p++;
 148                         } else {
 149                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 150                         }
 151                 }
 152         }
 153
 154         *called = *calling = '\0';
 155
 156         return 1 + (called_len + calling_len + 1) / 2;
 157 }
 158
 159 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 160                   struct x25_address *calling_addr)
 161 {
 162         unsigned int called_len, calling_len;
 163         char *called, *calling;
 164         int i;
 165
 166         called  = called_addr->x25_addr;
 167         calling = calling_addr->x25_addr;
 168
 169         called_len  = strlen(called);
 170         calling_len = strlen(calling);
 171
 172         *p++ = (calling_len << 4) | (called_len << 0);
 173
 174         for (i = 0; i < (called_len + calling_len); i++) {
 175                 if (i < called_len) {
 176                         if (i % 2 != 0) {
 177                                 *p |= (*called++ - '0') << 0;
 178                                 p++;
 179                         } else {
 180                                 *p = 0x00;
 181                                 *p |= (*called++ - '0') << 4;
 182                         }
 183                 } else {
 184                         if (i % 2 != 0) {
 185                                 *p |= (*calling++ - '0') << 0;
 186                                 p++;
 187                         } else {
 188                                 *p = 0x00;
 189                                 *p |= (*calling++ - '0') << 4;
 190                         }
 191                 }
 192         }
 193
 194         return 1 + (called_len + calling_len + 1) / 2;
 195 }
 196
 197 /*
 198  *      Socket removal during an interrupt is now safe.
 199  */
 200 static void x25_remove_socket(struct sock *sk)
 201 {
 202         write_lock_bh(&x25_list_lock);
 203         sk_del_node_init(sk);
 204         write_unlock_bh(&x25_list_lock);
 205 }
 206
 207 /*
 208  *      Kill all bound sockets on a dropped device.
 209  */
 210 static void x25_kill_by_device(struct net_device *dev)
 211 {
 212         struct sock *s;
 213
 214         write_lock_bh(&x25_list_lock);
 215
 216         sk_for_each(s, &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 = netdev_notifier_info_to_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 IS_ENABLED(CONFIG_LLC)
 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
 285         read_lock_bh(&x25_list_lock);
 286         next_best = NULL;
 287
 288         sk_for_each(s, &x25_list)
 289                 if ((!strcmp(addr->x25_addr,
 290                         x25_sk(s)->source_addr.x25_addr) ||
 291                                 !strcmp(x25_sk(s)->source_addr.x25_addr,
 292                                         null_x25_address.x25_addr)) &&
 293                                         s->sk_state == TCP_LISTEN) {
 294                         /*
 295                          * Found a listening socket, now check the incoming
 296                          * call user data vs this sockets call user data
 297                          */
 298                         if (x25_sk(s)->cudmatchlength > 0 &&
 299                                 skb->len >= x25_sk(s)->cudmatchlength) {
 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
 327         sk_for_each(s, &x25_list)
 328                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 329                         sock_hold(s);
 330                         goto found;
 331                 }
 332         s = NULL;
 333 found:
 334         return s;
 335 }
 336
 337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 338 {
 339         struct sock *s;
 340
 341         read_lock_bh(&x25_list_lock);
 342         s = __x25_find_socket(lci, nb);
 343         read_unlock_bh(&x25_list_lock);
 344         return s;
 345 }
 346
 347 /*
 348  *      Find a unique LCI for a given device.
 349  */
 350 static unsigned int x25_new_lci(struct x25_neigh *nb)
 351 {
 352         unsigned int lci = 1;
 353         struct sock *sk;
 354
 355         read_lock_bh(&x25_list_lock);
 356
 357         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 358                 sock_put(sk);
 359                 if (++lci == 4096) {
 360                         lci = 0;
 361                         break;
 362                 }
 363         }
 364
 365         read_unlock_bh(&x25_list_lock);
 366         return lci;
 367 }
 368
 369 /*
 370  *      Deferred destroy.
 371  */
 372 static void __x25_destroy_socket(struct sock *);
 373
 374 /*
 375  *      handler for deferred kills.
 376  */
 377 static void x25_destroy_timer(struct timer_list *t)
 378 {
 379         struct sock *sk = from_timer(sk, t, sk_timer);
 380
 381         x25_destroy_socket_from_timer(sk);
 382 }
 383
 384 /*
 385  *      This is called from user mode and the timers. Thus it protects itself
 386  *      against interrupt users but doesn't worry about being called during
 387  *      work. Once it is removed from the queue no interrupt or bottom half
 388  *      will touch it and we are (fairly 8-) ) safe.
 389  *      Not static as it's used by the timer
 390  */
 391 static void __x25_destroy_socket(struct sock *sk)
 392 {
 393         struct sk_buff *skb;
 394
 395         x25_stop_heartbeat(sk);
 396         x25_stop_timer(sk);
 397
 398         x25_remove_socket(sk);
 399         x25_clear_queues(sk);           /* Flush the queues */
 400
 401         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 402                 if (skb->sk != sk) {            /* A pending connection */
 403                         /*
 404                          * Queue the unaccepted socket for death
 405                          */
 406                         skb->sk->sk_state = TCP_LISTEN;
 407                         sock_set_flag(skb->sk, SOCK_DEAD);
 408                         x25_start_heartbeat(skb->sk);
 409                         x25_sk(skb->sk)->state = X25_STATE_0;
 410                 }
 411
 412                 kfree_skb(skb);
 413         }
 414
 415         if (sk_has_allocations(sk)) {
 416                 /* Defer: outstanding buffers */
 417                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 418                 sk->sk_timer.function = x25_destroy_timer;
 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 /*
 436  *      Handling for system calls applied via the various interfaces to a
 437  *      X.25 socket object.
 438  */
 439
 440 static int x25_setsockopt(struct socket *sock, int level, int optname,
 441                           char __user *optval, unsigned int optlen)
 442 {
 443         int opt;
 444         struct sock *sk = sock->sk;
 445         int rc = -ENOPROTOOPT;
 446
 447         if (level != SOL_X25 || optname != X25_QBITINCL)
 448                 goto out;
 449
 450         rc = -EINVAL;
 451         if (optlen < sizeof(int))
 452                 goto out;
 453
 454         rc = -EFAULT;
 455         if (get_user(opt, (int __user *)optval))
 456                 goto out;
 457
 458         if (opt)
 459                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 460         else
 461                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 462         rc = 0;
 463 out:
 464         return rc;
 465 }
 466
 467 static int x25_getsockopt(struct socket *sock, int level, int optname,
 468                           char __user *optval, int __user *optlen)
 469 {
 470         struct sock *sk = sock->sk;
 471         int val, len, rc = -ENOPROTOOPT;
 472
 473         if (level != SOL_X25 || optname != X25_QBITINCL)
 474                 goto out;
 475
 476         rc = -EFAULT;
 477         if (get_user(len, optlen))
 478                 goto out;
 479
 480         len = min_t(unsigned int, len, sizeof(int));
 481
 482         rc = -EINVAL;
 483         if (len < 0)
 484                 goto out;
 485
 486         rc = -EFAULT;
 487         if (put_user(len, optlen))
 488                 goto out;
 489
 490         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 491         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 492 out:
 493         return rc;
 494 }
 495
 496 static int x25_listen(struct socket *sock, int backlog)
 497 {
 498         struct sock *sk = sock->sk;
 499         int rc = -EOPNOTSUPP;
 500
 501         lock_sock(sk);
 502         if (sk->sk_state != TCP_LISTEN) {
 503                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 504                 sk->sk_max_ack_backlog = backlog;
 505                 sk->sk_state           = TCP_LISTEN;
 506                 rc = 0;
 507         }
 508         release_sock(sk);
 509
 510         return rc;
 511 }
 512
 513 static struct proto x25_proto = {
 514         .name     = "X25",
 515         .owner    = THIS_MODULE,
 516         .obj_size = sizeof(struct x25_sock),
 517 };
 518
 519 static struct sock *x25_alloc_socket(struct net *net, int kern)
 520 {
 521         struct x25_sock *x25;
 522         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 523
 524         if (!sk)
 525                 goto out;
 526
 527         sock_init_data(NULL, sk);
 528
 529         x25 = x25_sk(sk);
 530         skb_queue_head_init(&x25->ack_queue);
 531         skb_queue_head_init(&x25->fragment_queue);
 532         skb_queue_head_init(&x25->interrupt_in_queue);
 533         skb_queue_head_init(&x25->interrupt_out_queue);
 534 out:
 535         return sk;
 536 }
 537
 538 static int x25_create(struct net *net, struct socket *sock, int protocol,
 539                       int kern)
 540 {
 541         struct sock *sk;
 542         struct x25_sock *x25;
 543         int rc = -EAFNOSUPPORT;
 544
 545         if (!net_eq(net, &init_net))
 546                 goto out;
 547
 548         rc = -ESOCKTNOSUPPORT;
 549         if (sock->type != SOCK_SEQPACKET)
 550                 goto out;
 551
 552         rc = -EINVAL;
 553         if (protocol)
 554                 goto out;
 555
 556         rc = -ENOBUFS;
 557         if ((sk = x25_alloc_socket(net, kern)) == NULL)
 558                 goto out;
 559
 560         x25 = x25_sk(sk);
 561
 562         sock_init_data(sock, sk);
 563
 564         x25_init_timers(sk);
 565
 566         sock->ops    = &x25_proto_ops;
 567         sk->sk_protocol = protocol;
 568         sk->sk_backlog_rcv = x25_backlog_rcv;
 569
 570         x25->t21   = sysctl_x25_call_request_timeout;
 571         x25->t22   = sysctl_x25_reset_request_timeout;
 572         x25->t23   = sysctl_x25_clear_request_timeout;
 573         x25->t2    = sysctl_x25_ack_holdback_timeout;
 574         x25->state = X25_STATE_0;
 575         x25->cudmatchlength = 0;
 576         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 577                                                         /* on call accept   */
 578
 579         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 580         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 581         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 582         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 583         x25->facilities.throughput  = 0;        /* by default don't negotiate
 584                                                    throughput */
 585         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 586         x25->dte_facilities.calling_len = 0;
 587         x25->dte_facilities.called_len = 0;
 588         memset(x25->dte_facilities.called_ae, '\0',
 589                         sizeof(x25->dte_facilities.called_ae));
 590         memset(x25->dte_facilities.calling_ae, '\0',
 591                         sizeof(x25->dte_facilities.calling_ae));
 592
 593         rc = 0;
 594 out:
 595         return rc;
 596 }
 597
 598 static struct sock *x25_make_new(struct sock *osk)
 599 {
 600         struct sock *sk = NULL;
 601         struct x25_sock *x25, *ox25;
 602
 603         if (osk->sk_type != SOCK_SEQPACKET)
 604                 goto out;
 605
 606         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
 607                 goto out;
 608
 609         x25 = x25_sk(sk);
 610
 611         sk->sk_type        = osk->sk_type;
 612         sk->sk_priority    = osk->sk_priority;
 613         sk->sk_protocol    = osk->sk_protocol;
 614         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 615         sk->sk_sndbuf      = osk->sk_sndbuf;
 616         sk->sk_state       = TCP_ESTABLISHED;
 617         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 618         sock_copy_flags(sk, osk);
 619
 620         ox25 = x25_sk(osk);
 621         x25->t21        = ox25->t21;
 622         x25->t22        = ox25->t22;
 623         x25->t23        = ox25->t23;
 624         x25->t2         = ox25->t2;
 625         x25->flags      = ox25->flags;
 626         x25->facilities = ox25->facilities;
 627         x25->dte_facilities = ox25->dte_facilities;
 628         x25->cudmatchlength = ox25->cudmatchlength;
 629
 630         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 631         x25_init_timers(sk);
 632 out:
 633         return sk;
 634 }
 635
 636 static int x25_release(struct socket *sock)
 637 {
 638         struct sock *sk = sock->sk;
 639         struct x25_sock *x25;
 640
 641         if (!sk)
 642                 return 0;
 643
 644         x25 = x25_sk(sk);
 645
 646         sock_hold(sk);
 647         lock_sock(sk);
 648         switch (x25->state) {
 649
 650                 case X25_STATE_0:
 651                 case X25_STATE_2:
 652                         x25_disconnect(sk, 0, 0, 0);
 653                         __x25_destroy_socket(sk);
 654                         goto out;
 655
 656                 case X25_STATE_1:
 657                 case X25_STATE_3:
 658                 case X25_STATE_4:
 659                         x25_clear_queues(sk);
 660                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 661                         x25_start_t23timer(sk);
 662                         x25->state = X25_STATE_2;
 663                         sk->sk_state    = TCP_CLOSE;
 664                         sk->sk_shutdown |= SEND_SHUTDOWN;
 665                         sk->sk_state_change(sk);
 666                         sock_set_flag(sk, SOCK_DEAD);
 667                         sock_set_flag(sk, SOCK_DESTROY);
 668                         break;
 669         }
 670
 671         sock_orphan(sk);
 672 out:
 673         release_sock(sk);
 674         sock_put(sk);
 675         return 0;
 676 }
 677
 678 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 679 {
 680         struct sock *sk = sock->sk;
 681         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 682         int len, i, rc = 0;
 683
 684         if (!sock_flag(sk, SOCK_ZAPPED) ||
 685             addr_len != sizeof(struct sockaddr_x25) ||
 686             addr->sx25_family != AF_X25) {
 687                 rc = -EINVAL;
 688                 goto out;
 689         }
 690
 691         /* check for the null_x25_address */
 692         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
 693
 694                 len = strlen(addr->sx25_addr.x25_addr);
 695                 for (i = 0; i < len; i++) {
 696                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 697                                 rc = -EINVAL;
 698                                 goto out;
 699                         }
 700                 }
 701         }
 702
 703         lock_sock(sk);
 704         x25_sk(sk)->source_addr = addr->sx25_addr;
 705         x25_insert_socket(sk);
 706         sock_reset_flag(sk, SOCK_ZAPPED);
 707         release_sock(sk);
 708         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 709 out:
 710         return rc;
 711 }
 712
 713 static int x25_wait_for_connection_establishment(struct sock *sk)
 714 {
 715         DECLARE_WAITQUEUE(wait, current);
 716         int rc;
 717
 718         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 719         for (;;) {
 720                 __set_current_state(TASK_INTERRUPTIBLE);
 721                 rc = -ERESTARTSYS;
 722                 if (signal_pending(current))
 723                         break;
 724                 rc = sock_error(sk);
 725                 if (rc) {
 726                         sk->sk_socket->state = SS_UNCONNECTED;
 727                         break;
 728                 }
 729                 rc = 0;
 730                 if (sk->sk_state != TCP_ESTABLISHED) {
 731                         release_sock(sk);
 732                         schedule();
 733                         lock_sock(sk);
 734                 } else
 735                         break;
 736         }
 737         __set_current_state(TASK_RUNNING);
 738         remove_wait_queue(sk_sleep(sk), &wait);
 739         return rc;
 740 }
 741
 742 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 743                        int addr_len, int flags)
 744 {
 745         struct sock *sk = sock->sk;
 746         struct x25_sock *x25 = x25_sk(sk);
 747         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 748         struct x25_route *rt;
 749         int rc = 0;
 750
 751         lock_sock(sk);
 752         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 753                 sock->state = SS_CONNECTED;
 754                 goto out; /* Connect completed during a ERESTARTSYS event */
 755         }
 756
 757         rc = -ECONNREFUSED;
 758         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 759                 sock->state = SS_UNCONNECTED;
 760                 goto out;
 761         }
 762
 763         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 764         if (sk->sk_state == TCP_ESTABLISHED)
 765                 goto out;
 766
 767         sk->sk_state   = TCP_CLOSE;
 768         sock->state = SS_UNCONNECTED;
 769
 770         rc = -EINVAL;
 771         if (addr_len != sizeof(struct sockaddr_x25) ||
 772             addr->sx25_family != AF_X25)
 773                 goto out;
 774
 775         rc = -ENETUNREACH;
 776         rt = x25_get_route(&addr->sx25_addr);
 777         if (!rt)
 778                 goto out;
 779
 780         x25->neighbour = x25_get_neigh(rt->dev);
 781         if (!x25->neighbour)
 782                 goto out_put_route;
 783
 784         x25_limit_facilities(&x25->facilities, x25->neighbour);
 785
 786         x25->lci = x25_new_lci(x25->neighbour);
 787         if (!x25->lci)
 788                 goto out_put_neigh;
 789
 790         rc = -EINVAL;
 791         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 792                 goto out_put_neigh;
 793
 794         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 795                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 796
 797         x25->dest_addr = addr->sx25_addr;
 798
 799         /* Move to connecting socket, start sending Connect Requests */
 800         sock->state   = SS_CONNECTING;
 801         sk->sk_state  = TCP_SYN_SENT;
 802
 803         x25->state = X25_STATE_1;
 804
 805         x25_write_internal(sk, X25_CALL_REQUEST);
 806
 807         x25_start_heartbeat(sk);
 808         x25_start_t21timer(sk);
 809
 810         /* Now the loop */
 811         rc = -EINPROGRESS;
 812         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 813                 goto out_put_neigh;
 814
 815         rc = x25_wait_for_connection_establishment(sk);
 816         if (rc)
 817                 goto out_put_neigh;
 818
 819         sock->state = SS_CONNECTED;
 820         rc = 0;
 821 out_put_neigh:
 822         if (rc)
 823                 x25_neigh_put(x25->neighbour);
 824 out_put_route:
 825         x25_route_put(rt);
 826 out:
 827         release_sock(sk);
 828         return rc;
 829 }
 830
 831 static int x25_wait_for_data(struct sock *sk, long timeout)
 832 {
 833         DECLARE_WAITQUEUE(wait, current);
 834         int rc = 0;
 835
 836         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 837         for (;;) {
 838                 __set_current_state(TASK_INTERRUPTIBLE);
 839                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 840                         break;
 841                 rc = -ERESTARTSYS;
 842                 if (signal_pending(current))
 843                         break;
 844                 rc = -EAGAIN;
 845                 if (!timeout)
 846                         break;
 847                 rc = 0;
 848                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 849                         release_sock(sk);
 850                         timeout = schedule_timeout(timeout);
 851                         lock_sock(sk);
 852                 } else
 853                         break;
 854         }
 855         __set_current_state(TASK_RUNNING);
 856         remove_wait_queue(sk_sleep(sk), &wait);
 857         return rc;
 858 }
 859
 860 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 861                       bool kern)
 862 {
 863         struct sock *sk = sock->sk;
 864         struct sock *newsk;
 865         struct sk_buff *skb;
 866         int rc = -EINVAL;
 867
 868         if (!sk)
 869                 goto out;
 870
 871         rc = -EOPNOTSUPP;
 872         if (sk->sk_type != SOCK_SEQPACKET)
 873                 goto out;
 874
 875         lock_sock(sk);
 876         rc = -EINVAL;
 877         if (sk->sk_state != TCP_LISTEN)
 878                 goto out2;
 879
 880         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 881         if (rc)
 882                 goto out2;
 883         skb = skb_dequeue(&sk->sk_receive_queue);
 884         rc = -EINVAL;
 885         if (!skb->sk)
 886                 goto out2;
 887         newsk            = skb->sk;
 888         sock_graft(newsk, newsock);
 889
 890         /* Now attach up the new socket */
 891         skb->sk = NULL;
 892         kfree_skb(skb);
 893         sk->sk_ack_backlog--;
 894         newsock->state = SS_CONNECTED;
 895         rc = 0;
 896 out2:
 897         release_sock(sk);
 898 out:
 899         return rc;
 900 }
 901
 902 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 903                        int peer)
 904 {
 905         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 906         struct sock *sk = sock->sk;
 907         struct x25_sock *x25 = x25_sk(sk);
 908         int rc = 0;
 909
 910         if (peer) {
 911                 if (sk->sk_state != TCP_ESTABLISHED) {
 912                         rc = -ENOTCONN;
 913                         goto out;
 914                 }
 915                 sx25->sx25_addr = x25->dest_addr;
 916         } else
 917                 sx25->sx25_addr = x25->source_addr;
 918
 919         sx25->sx25_family = AF_X25;
 920         rc = sizeof(*sx25);
 921
 922 out:
 923         return rc;
 924 }
 925
 926 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 927                         unsigned int lci)
 928 {
 929         struct sock *sk;
 930         struct sock *make;
 931         struct x25_sock *makex25;
 932         struct x25_address source_addr, dest_addr;
 933         struct x25_facilities facilities;
 934         struct x25_dte_facilities dte_facilities;
 935         int len, addr_len, rc;
 936
 937         /*
 938          *      Remove the LCI and frame type.
 939          */
 940         skb_pull(skb, X25_STD_MIN_LEN);
 941
 942         /*
 943          *      Extract the X.25 addresses and convert them to ASCII strings,
 944          *      and remove them.
 945          *
 946          *      Address block is mandatory in call request packets
 947          */
 948         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 949         if (addr_len <= 0)
 950                 goto out_clear_request;
 951         skb_pull(skb, addr_len);
 952
 953         /*
 954          *      Get the length of the facilities, skip past them for the moment
 955          *      get the call user data because this is needed to determine
 956          *      the correct listener
 957          *
 958          *      Facilities length is mandatory in call request packets
 959          */
 960         if (!pskb_may_pull(skb, 1))
 961                 goto out_clear_request;
 962         len = skb->data[0] + 1;
 963         if (!pskb_may_pull(skb, len))
 964                 goto out_clear_request;
 965         skb_pull(skb,len);
 966
 967         /*
 968          *      Ensure that the amount of call user data is valid.
 969          */
 970         if (skb->len > X25_MAX_CUD_LEN)
 971                 goto out_clear_request;
 972
 973         /*
 974          *      Get all the call user data so it can be used in
 975          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 976          */
 977         if (!pskb_may_pull(skb, skb->len))
 978                 goto out_clear_request;
 979
 980         /*
 981          *      Find a listener for the particular address/cud pair.
 982          */
 983         sk = x25_find_listener(&source_addr,skb);
 984         skb_push(skb,len);
 985
 986         if (sk != NULL && sk_acceptq_is_full(sk)) {
 987                 goto out_sock_put;
 988         }
 989
 990         /*
 991          *      We dont have any listeners for this incoming call.
 992          *      Try forwarding it.
 993          */
 994         if (sk == NULL) {
 995                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 996                 if (sysctl_x25_forward &&
 997                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 998                 {
 999                         /* Call was forwarded, dont process it any more */
1000                         kfree_skb(skb);
1001                         rc = 1;
1002                         goto out;
1003                 } else {
1004                         /* No listeners, can't forward, clear the call */
1005                         goto out_clear_request;
1006                 }
1007         }
1008
1009         /*
1010          *      Try to reach a compromise on the requested facilities.
1011          */
1012         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1013         if (len == -1)
1014                 goto out_sock_put;
1015
1016         /*
1017          * current neighbour/link might impose additional limits
1018          * on certain facilties
1019          */
1020
1021         x25_limit_facilities(&facilities, nb);
1022
1023         /*
1024          *      Try to create a new socket.
1025          */
1026         make = x25_make_new(sk);
1027         if (!make)
1028                 goto out_sock_put;
1029
1030         /*
1031          *      Remove the facilities
1032          */
1033         skb_pull(skb, len);
1034
1035         skb->sk     = make;
1036         make->sk_state = TCP_ESTABLISHED;
1037
1038         makex25 = x25_sk(make);
1039         makex25->lci           = lci;
1040         makex25->dest_addr     = dest_addr;
1041         makex25->source_addr   = source_addr;
1042         makex25->neighbour     = nb;
1043         makex25->facilities    = facilities;
1044         makex25->dte_facilities= dte_facilities;
1045         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1046         /* ensure no reverse facil on accept */
1047         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1048         /* ensure no calling address extension on accept */
1049         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1050         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1051
1052         /* Normally all calls are accepted immediately */
1053         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1054                 x25_write_internal(make, X25_CALL_ACCEPTED);
1055                 makex25->state = X25_STATE_3;
1056         }
1057
1058         /*
1059          *      Incoming Call User Data.
1060          */
1061         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1062         makex25->calluserdata.cudlength = skb->len;
1063
1064         sk->sk_ack_backlog++;
1065
1066         x25_insert_socket(make);
1067
1068         skb_queue_head(&sk->sk_receive_queue, skb);
1069
1070         x25_start_heartbeat(make);
1071
1072         if (!sock_flag(sk, SOCK_DEAD))
1073                 sk->sk_data_ready(sk);
1074         rc = 1;
1075         sock_put(sk);
1076 out:
1077         return rc;
1078 out_sock_put:
1079         sock_put(sk);
1080 out_clear_request:
1081         rc = 0;
1082         x25_transmit_clear_request(nb, lci, 0x01);
1083         goto out;
1084 }
1085
1086 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1087 {
1088         struct sock *sk = sock->sk;
1089         struct x25_sock *x25 = x25_sk(sk);
1090         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1091         struct sockaddr_x25 sx25;
1092         struct sk_buff *skb;
1093         unsigned char *asmptr;
1094         int noblock = msg->msg_flags & MSG_DONTWAIT;
1095         size_t size;
1096         int qbit = 0, rc = -EINVAL;
1097
1098         lock_sock(sk);
1099         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1100                 goto out;
1101
1102         /* we currently don't support segmented records at the user interface */
1103         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1104                 goto out;
1105
1106         rc = -EADDRNOTAVAIL;
1107         if (sock_flag(sk, SOCK_ZAPPED))
1108                 goto out;
1109
1110         rc = -EPIPE;
1111         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1112                 send_sig(SIGPIPE, current, 0);
1113                 goto out;
1114         }
1115
1116         rc = -ENETUNREACH;
1117         if (!x25->neighbour)
1118                 goto out;
1119
1120         if (usx25) {
1121                 rc = -EINVAL;
1122                 if (msg->msg_namelen < sizeof(sx25))
1123                         goto out;
1124                 memcpy(&sx25, usx25, sizeof(sx25));
1125                 rc = -EISCONN;
1126                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1127                         goto out;
1128                 rc = -EINVAL;
1129                 if (sx25.sx25_family != AF_X25)
1130                         goto out;
1131         } else {
1132                 /*
1133                  *      FIXME 1003.1g - if the socket is like this because
1134                  *      it has become closed (not started closed) we ought
1135                  *      to SIGPIPE, EPIPE;
1136                  */
1137                 rc = -ENOTCONN;
1138                 if (sk->sk_state != TCP_ESTABLISHED)
1139                         goto out;
1140
1141                 sx25.sx25_family = AF_X25;
1142                 sx25.sx25_addr   = x25->dest_addr;
1143         }
1144
1145         /* Sanity check the packet size */
1146         if (len > 65535) {
1147                 rc = -EMSGSIZE;
1148                 goto out;
1149         }
1150
1151         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1152
1153         /* Build a packet */
1154         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1155
1156         if ((msg->msg_flags & MSG_OOB) && len > 32)
1157                 len = 32;
1158
1159         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1160
1161         release_sock(sk);
1162         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1163         lock_sock(sk);
1164         if (!skb)
1165                 goto out;
1166         X25_SKB_CB(skb)->flags = msg->msg_flags;
1167
1168         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1169
1170         /*
1171          *      Put the data on the end
1172          */
1173         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1174
1175         skb_reset_transport_header(skb);
1176         skb_put(skb, len);
1177
1178         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1179         if (rc)
1180                 goto out_kfree_skb;
1181
1182         /*
1183          *      If the Q BIT Include socket option is in force, the first
1184          *      byte of the user data is the logical value of the Q Bit.
1185          */
1186         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1187                 if (!pskb_may_pull(skb, 1))
1188                         goto out_kfree_skb;
1189
1190                 qbit = skb->data[0];
1191                 skb_pull(skb, 1);
1192         }
1193
1194         /*
1195          *      Push down the X.25 header
1196          */
1197         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1198
1199         if (msg->msg_flags & MSG_OOB) {
1200                 if (x25->neighbour->extended) {
1201                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1202                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1203                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1204                         *asmptr++ = X25_INTERRUPT;
1205                 } else {
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_INTERRUPT;
1210                 }
1211         } else {
1212                 if (x25->neighbour->extended) {
1213                         /* Build an Extended X.25 header */
1214                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1215                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1216                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1217                         *asmptr++ = X25_DATA;
1218                         *asmptr++ = X25_DATA;
1219                 } else {
1220                         /* Build an Standard X.25 header */
1221                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1222                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1223                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1224                         *asmptr++ = X25_DATA;
1225                 }
1226
1227                 if (qbit)
1228                         skb->data[0] |= X25_Q_BIT;
1229         }
1230
1231         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1232         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1233
1234         rc = -ENOTCONN;
1235         if (sk->sk_state != TCP_ESTABLISHED)
1236                 goto out_kfree_skb;
1237
1238         if (msg->msg_flags & MSG_OOB)
1239                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1240         else {
1241                 rc = x25_output(sk, skb);
1242                 len = rc;
1243                 if (rc < 0)
1244                         kfree_skb(skb);
1245                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1246                         len++;
1247         }
1248
1249         x25_kick(sk);
1250         rc = len;
1251 out:
1252         release_sock(sk);
1253         return rc;
1254 out_kfree_skb:
1255         kfree_skb(skb);
1256         goto out;
1257 }
1258
1259
1260 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1261                        int flags)
1262 {
1263         struct sock *sk = sock->sk;
1264         struct x25_sock *x25 = x25_sk(sk);
1265         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1266         size_t copied;
1267         int qbit, header_len;
1268         struct sk_buff *skb;
1269         unsigned char *asmptr;
1270         int rc = -ENOTCONN;
1271
1272         lock_sock(sk);
1273
1274         if (x25->neighbour == NULL)
1275                 goto out;
1276
1277         header_len = x25->neighbour->extended ?
1278                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1279
1280         /*
1281          * This works for seqpacket too. The receiver has ordered the queue for
1282          * us! We do one quick check first though
1283          */
1284         if (sk->sk_state != TCP_ESTABLISHED)
1285                 goto out;
1286
1287         if (flags & MSG_OOB) {
1288                 rc = -EINVAL;
1289                 if (sock_flag(sk, SOCK_URGINLINE) ||
1290                     !skb_peek(&x25->interrupt_in_queue))
1291                         goto out;
1292
1293                 skb = skb_dequeue(&x25->interrupt_in_queue);
1294
1295                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1296                         goto out_free_dgram;
1297
1298                 skb_pull(skb, X25_STD_MIN_LEN);
1299
1300                 /*
1301                  *      No Q bit information on Interrupt data.
1302                  */
1303                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1304                         asmptr  = skb_push(skb, 1);
1305                         *asmptr = 0x00;
1306                 }
1307
1308                 msg->msg_flags |= MSG_OOB;
1309         } else {
1310                 /* Now we can treat all alike */
1311                 release_sock(sk);
1312                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1313                                         flags & MSG_DONTWAIT, &rc);
1314                 lock_sock(sk);
1315                 if (!skb)
1316                         goto out;
1317
1318                 if (!pskb_may_pull(skb, header_len))
1319                         goto out_free_dgram;
1320
1321                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1322
1323                 skb_pull(skb, header_len);
1324
1325                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1326                         asmptr  = skb_push(skb, 1);
1327                         *asmptr = qbit;
1328                 }
1329         }
1330
1331         skb_reset_transport_header(skb);
1332         copied = skb->len;
1333
1334         if (copied > size) {
1335                 copied = size;
1336                 msg->msg_flags |= MSG_TRUNC;
1337         }
1338
1339         /* Currently, each datagram always contains a complete record */
1340         msg->msg_flags |= MSG_EOR;
1341
1342         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1343         if (rc)
1344                 goto out_free_dgram;
1345
1346         if (sx25) {
1347                 sx25->sx25_family = AF_X25;
1348                 sx25->sx25_addr   = x25->dest_addr;
1349                 msg->msg_namelen = sizeof(*sx25);
1350         }
1351
1352         x25_check_rbuf(sk);
1353         rc = copied;
1354 out_free_dgram:
1355         skb_free_datagram(sk, skb);
1356 out:
1357         release_sock(sk);
1358         return rc;
1359 }
1360
1361
1362 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1363 {
1364         struct sock *sk = sock->sk;
1365         struct x25_sock *x25 = x25_sk(sk);
1366         void __user *argp = (void __user *)arg;
1367         int rc;
1368
1369         switch (cmd) {
1370         case TIOCOUTQ: {
1371                 int amount;
1372
1373                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1374                 if (amount < 0)
1375                         amount = 0;
1376                 rc = put_user(amount, (unsigned int __user *)argp);
1377                 break;
1378         }
1379
1380         case TIOCINQ: {
1381                 struct sk_buff *skb;
1382                 int amount = 0;
1383                 /*
1384                  * These two are safe on a single CPU system as
1385                  * only user tasks fiddle here
1386                  */
1387                 lock_sock(sk);
1388                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1389                         amount = skb->len;
1390                 release_sock(sk);
1391                 rc = put_user(amount, (unsigned int __user *)argp);
1392                 break;
1393         }
1394
1395         case SIOCGSTAMP:
1396                 rc = -EINVAL;
1397                 if (sk)
1398                         rc = sock_get_timestamp(sk,
1399                                                 (struct timeval __user *)argp);
1400                 break;
1401         case SIOCGSTAMPNS:
1402                 rc = -EINVAL;
1403                 if (sk)
1404                         rc = sock_get_timestampns(sk,
1405                                         (struct timespec __user *)argp);
1406                 break;
1407         case SIOCGIFADDR:
1408         case SIOCSIFADDR:
1409         case SIOCGIFDSTADDR:
1410         case SIOCSIFDSTADDR:
1411         case SIOCGIFBRDADDR:
1412         case SIOCSIFBRDADDR:
1413         case SIOCGIFNETMASK:
1414         case SIOCSIFNETMASK:
1415         case SIOCGIFMETRIC:
1416         case SIOCSIFMETRIC:
1417                 rc = -EINVAL;
1418                 break;
1419         case SIOCADDRT:
1420         case SIOCDELRT:
1421                 rc = -EPERM;
1422                 if (!capable(CAP_NET_ADMIN))
1423                         break;
1424                 rc = x25_route_ioctl(cmd, argp);
1425                 break;
1426         case SIOCX25GSUBSCRIP:
1427                 rc = x25_subscr_ioctl(cmd, argp);
1428                 break;
1429         case SIOCX25SSUBSCRIP:
1430                 rc = -EPERM;
1431                 if (!capable(CAP_NET_ADMIN))
1432                         break;
1433                 rc = x25_subscr_ioctl(cmd, argp);
1434                 break;
1435         case SIOCX25GFACILITIES: {
1436                 lock_sock(sk);
1437                 rc = copy_to_user(argp, &x25->facilities,
1438                                   sizeof(x25->facilities))
1439                         ? -EFAULT : 0;
1440                 release_sock(sk);
1441                 break;
1442         }
1443
1444         case SIOCX25SFACILITIES: {
1445                 struct x25_facilities facilities;
1446                 rc = -EFAULT;
1447                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1448                         break;
1449                 rc = -EINVAL;
1450                 lock_sock(sk);
1451                 if (sk->sk_state != TCP_LISTEN &&
1452                     sk->sk_state != TCP_CLOSE)
1453                         goto out_fac_release;
1454                 if (facilities.pacsize_in < X25_PS16 ||
1455                     facilities.pacsize_in > X25_PS4096)
1456                         goto out_fac_release;
1457                 if (facilities.pacsize_out < X25_PS16 ||
1458                     facilities.pacsize_out > X25_PS4096)
1459                         goto out_fac_release;
1460                 if (facilities.winsize_in < 1 ||
1461                     facilities.winsize_in > 127)
1462                         goto out_fac_release;
1463                 if (facilities.throughput) {
1464                         int out = facilities.throughput & 0xf0;
1465                         int in  = facilities.throughput & 0x0f;
1466                         if (!out)
1467                                 facilities.throughput |=
1468                                         X25_DEFAULT_THROUGHPUT << 4;
1469                         else if (out < 0x30 || out > 0xD0)
1470                                 goto out_fac_release;
1471                         if (!in)
1472                                 facilities.throughput |=
1473                                         X25_DEFAULT_THROUGHPUT;
1474                         else if (in < 0x03 || in > 0x0D)
1475                                 goto out_fac_release;
1476                 }
1477                 if (facilities.reverse &&
1478                     (facilities.reverse & 0x81) != 0x81)
1479                         goto out_fac_release;
1480                 x25->facilities = facilities;
1481                 rc = 0;
1482 out_fac_release:
1483                 release_sock(sk);
1484                 break;
1485         }
1486
1487         case SIOCX25GDTEFACILITIES: {
1488                 lock_sock(sk);
1489                 rc = copy_to_user(argp, &x25->dte_facilities,
1490                                   sizeof(x25->dte_facilities));
1491                 release_sock(sk);
1492                 if (rc)
1493                         rc = -EFAULT;
1494                 break;
1495         }
1496
1497         case SIOCX25SDTEFACILITIES: {
1498                 struct x25_dte_facilities dtefacs;
1499                 rc = -EFAULT;
1500                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1501                         break;
1502                 rc = -EINVAL;
1503                 lock_sock(sk);
1504                 if (sk->sk_state != TCP_LISTEN &&
1505                     sk->sk_state != TCP_CLOSE)
1506                         goto out_dtefac_release;
1507                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1508                         goto out_dtefac_release;
1509                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1510                         goto out_dtefac_release;
1511                 x25->dte_facilities = dtefacs;
1512                 rc = 0;
1513 out_dtefac_release:
1514                 release_sock(sk);
1515                 break;
1516         }
1517
1518         case SIOCX25GCALLUSERDATA: {
1519                 lock_sock(sk);
1520                 rc = copy_to_user(argp, &x25->calluserdata,
1521                                   sizeof(x25->calluserdata))
1522                         ? -EFAULT : 0;
1523                 release_sock(sk);
1524                 break;
1525         }
1526
1527         case SIOCX25SCALLUSERDATA: {
1528                 struct x25_calluserdata calluserdata;
1529
1530                 rc = -EFAULT;
1531                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1532                         break;
1533                 rc = -EINVAL;
1534                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1535                         break;
1536                 lock_sock(sk);
1537                 x25->calluserdata = calluserdata;
1538                 release_sock(sk);
1539                 rc = 0;
1540                 break;
1541         }
1542
1543         case SIOCX25GCAUSEDIAG: {
1544                 lock_sock(sk);
1545                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1546                         ? -EFAULT : 0;
1547                 release_sock(sk);
1548                 break;
1549         }
1550
1551         case SIOCX25SCAUSEDIAG: {
1552                 struct x25_causediag causediag;
1553                 rc = -EFAULT;
1554                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1555                         break;
1556                 lock_sock(sk);
1557                 x25->causediag = causediag;
1558                 release_sock(sk);
1559                 rc = 0;
1560                 break;
1561
1562         }
1563
1564         case SIOCX25SCUDMATCHLEN: {
1565                 struct x25_subaddr sub_addr;
1566                 rc = -EINVAL;
1567                 lock_sock(sk);
1568                 if(sk->sk_state != TCP_CLOSE)
1569                         goto out_cud_release;
1570                 rc = -EFAULT;
1571                 if (copy_from_user(&sub_addr, argp,
1572                                    sizeof(sub_addr)))
1573                         goto out_cud_release;
1574                 rc = -EINVAL;
1575                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1576                         goto out_cud_release;
1577                 x25->cudmatchlength = sub_addr.cudmatchlength;
1578                 rc = 0;
1579 out_cud_release:
1580                 release_sock(sk);
1581                 break;
1582         }
1583
1584         case SIOCX25CALLACCPTAPPRV: {
1585                 rc = -EINVAL;
1586                 lock_sock(sk);
1587                 if (sk->sk_state == TCP_CLOSE) {
1588                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1589                         rc = 0;
1590                 }
1591                 release_sock(sk);
1592                 break;
1593         }
1594
1595         case SIOCX25SENDCALLACCPT:  {
1596                 rc = -EINVAL;
1597                 lock_sock(sk);
1598                 if (sk->sk_state != TCP_ESTABLISHED)
1599                         goto out_sendcallaccpt_release;
1600                 /* must call accptapprv above */
1601                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1602                         goto out_sendcallaccpt_release;
1603                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1604                 x25->state = X25_STATE_3;
1605                 rc = 0;
1606 out_sendcallaccpt_release:
1607                 release_sock(sk);
1608                 break;
1609         }
1610
1611         default:
1612                 rc = -ENOIOCTLCMD;
1613                 break;
1614         }
1615
1616         return rc;
1617 }
1618
1619 static const struct net_proto_family x25_family_ops = {
1620         .family =       AF_X25,
1621         .create =       x25_create,
1622         .owner  =       THIS_MODULE,
1623 };
1624
1625 #ifdef CONFIG_COMPAT
1626 static int compat_x25_subscr_ioctl(unsigned int cmd,
1627                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1628 {
1629         struct compat_x25_subscrip_struct x25_subscr;
1630         struct x25_neigh *nb;
1631         struct net_device *dev;
1632         int rc = -EINVAL;
1633
1634         rc = -EFAULT;
1635         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1636                 goto out;
1637
1638         rc = -EINVAL;
1639         dev = x25_dev_get(x25_subscr.device);
1640         if (dev == NULL)
1641                 goto out;
1642
1643         nb = x25_get_neigh(dev);
1644         if (nb == NULL)
1645                 goto out_dev_put;
1646
1647         dev_put(dev);
1648
1649         if (cmd == SIOCX25GSUBSCRIP) {
1650                 read_lock_bh(&x25_neigh_list_lock);
1651                 x25_subscr.extended = nb->extended;
1652                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1653                 read_unlock_bh(&x25_neigh_list_lock);
1654                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1655                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1656         } else {
1657                 rc = -EINVAL;
1658                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1659                         rc = 0;
1660                         write_lock_bh(&x25_neigh_list_lock);
1661                         nb->extended = x25_subscr.extended;
1662                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1663                         write_unlock_bh(&x25_neigh_list_lock);
1664                 }
1665         }
1666         x25_neigh_put(nb);
1667 out:
1668         return rc;
1669 out_dev_put:
1670         dev_put(dev);
1671         goto out;
1672 }
1673
1674 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1675                                 unsigned long arg)
1676 {
1677         void __user *argp = compat_ptr(arg);
1678         struct sock *sk = sock->sk;
1679
1680         int rc = -ENOIOCTLCMD;
1681
1682         switch(cmd) {
1683         case TIOCOUTQ:
1684         case TIOCINQ:
1685                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1686                 break;
1687         case SIOCGSTAMP:
1688                 rc = -EINVAL;
1689                 if (sk)
1690                         rc = compat_sock_get_timestamp(sk,
1691                                         (struct timeval __user*)argp);
1692                 break;
1693         case SIOCGSTAMPNS:
1694                 rc = -EINVAL;
1695                 if (sk)
1696                         rc = compat_sock_get_timestampns(sk,
1697                                         (struct timespec __user*)argp);
1698                 break;
1699         case SIOCGIFADDR:
1700         case SIOCSIFADDR:
1701         case SIOCGIFDSTADDR:
1702         case SIOCSIFDSTADDR:
1703         case SIOCGIFBRDADDR:
1704         case SIOCSIFBRDADDR:
1705         case SIOCGIFNETMASK:
1706         case SIOCSIFNETMASK:
1707         case SIOCGIFMETRIC:
1708         case SIOCSIFMETRIC:
1709                 rc = -EINVAL;
1710                 break;
1711         case SIOCADDRT:
1712         case SIOCDELRT:
1713                 rc = -EPERM;
1714                 if (!capable(CAP_NET_ADMIN))
1715                         break;
1716                 rc = x25_route_ioctl(cmd, argp);
1717                 break;
1718         case SIOCX25GSUBSCRIP:
1719                 rc = compat_x25_subscr_ioctl(cmd, argp);
1720                 break;
1721         case SIOCX25SSUBSCRIP:
1722                 rc = -EPERM;
1723                 if (!capable(CAP_NET_ADMIN))
1724                         break;
1725                 rc = compat_x25_subscr_ioctl(cmd, argp);
1726                 break;
1727         case SIOCX25GFACILITIES:
1728         case SIOCX25SFACILITIES:
1729         case SIOCX25GDTEFACILITIES:
1730         case SIOCX25SDTEFACILITIES:
1731         case SIOCX25GCALLUSERDATA:
1732         case SIOCX25SCALLUSERDATA:
1733         case SIOCX25GCAUSEDIAG:
1734         case SIOCX25SCAUSEDIAG:
1735         case SIOCX25SCUDMATCHLEN:
1736         case SIOCX25CALLACCPTAPPRV:
1737         case SIOCX25SENDCALLACCPT:
1738                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1739                 break;
1740         default:
1741                 rc = -ENOIOCTLCMD;
1742                 break;
1743         }
1744         return rc;
1745 }
1746 #endif
1747
1748 static const struct proto_ops x25_proto_ops = {
1749         .family =       AF_X25,
1750         .owner =        THIS_MODULE,
1751         .release =      x25_release,
1752         .bind =         x25_bind,
1753         .connect =      x25_connect,
1754         .socketpair =   sock_no_socketpair,
1755         .accept =       x25_accept,
1756         .getname =      x25_getname,
1757         .poll =         datagram_poll,
1758         .ioctl =        x25_ioctl,
1759 #ifdef CONFIG_COMPAT
1760         .compat_ioctl = compat_x25_ioctl,
1761 #endif
1762         .listen =       x25_listen,
1763         .shutdown =     sock_no_shutdown,
1764         .setsockopt =   x25_setsockopt,
1765         .getsockopt =   x25_getsockopt,
1766         .sendmsg =      x25_sendmsg,
1767         .recvmsg =      x25_recvmsg,
1768         .mmap =         sock_no_mmap,
1769         .sendpage =     sock_no_sendpage,
1770 };
1771
1772 static struct packet_type x25_packet_type __read_mostly = {
1773         .type = cpu_to_be16(ETH_P_X25),
1774         .func = x25_lapb_receive_frame,
1775 };
1776
1777 static struct notifier_block x25_dev_notifier = {
1778         .notifier_call = x25_device_event,
1779 };
1780
1781 void x25_kill_by_neigh(struct x25_neigh *nb)
1782 {
1783         struct sock *s;
1784
1785         write_lock_bh(&x25_list_lock);
1786
1787         sk_for_each(s, &x25_list)
1788                 if (x25_sk(s)->neighbour == nb)
1789                         x25_disconnect(s, ENETUNREACH, 0, 0);
1790
1791         write_unlock_bh(&x25_list_lock);
1792
1793         /* Remove any related forwards */
1794         x25_clear_forward_by_dev(nb->dev);
1795 }
1796
1797 static int __init x25_init(void)
1798 {
1799         int rc;
1800
1801         rc = proto_register(&x25_proto, 0);
1802         if (rc)
1803                 goto out;
1804
1805         rc = sock_register(&x25_family_ops);
1806         if (rc)
1807                 goto out_proto;
1808
1809         dev_add_pack(&x25_packet_type);
1810
1811         rc = register_netdevice_notifier(&x25_dev_notifier);
1812         if (rc)
1813                 goto out_sock;
1814
1815         rc = x25_register_sysctl();
1816         if (rc)
1817                 goto out_dev;
1818
1819         rc = x25_proc_init();
1820         if (rc)
1821                 goto out_sysctl;
1822
1823         pr_info("Linux Version 0.2\n");
1824
1825 out:
1826         return rc;
1827 out_sysctl:
1828         x25_unregister_sysctl();
1829 out_dev:
1830         unregister_netdevice_notifier(&x25_dev_notifier);
1831 out_sock:
1832         dev_remove_pack(&x25_packet_type);
1833         sock_unregister(AF_X25);
1834 out_proto:
1835         proto_unregister(&x25_proto);
1836         goto out;
1837 }
1838 module_init(x25_init);
1839
1840 static void __exit x25_exit(void)
1841 {
1842         x25_proc_exit();
1843         x25_link_free();
1844         x25_route_free();
1845
1846         x25_unregister_sysctl();
1847
1848         unregister_netdevice_notifier(&x25_dev_notifier);
1849
1850         dev_remove_pack(&x25_packet_type);
1851
1852         sock_unregister(AF_X25);
1853         proto_unregister(&x25_proto);
1854 }
1855 module_exit(x25_exit);
1856
1857 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1858 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1859 MODULE_LICENSE("GPL");
1860 MODULE_ALIAS_NETPROTO(PF_X25);