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         while ((sk = x25_find_socket(lci, nb)) != NULL) {
 356                 sock_put(sk);
 357                 if (++lci == 4096) {
 358                         lci = 0;
 359                         break;
 360                 }
 361                 cond_resched();
 362         }
 363
 364         return lci;
 365 }
 366
 367 /*
 368  *      Deferred destroy.
 369  */
 370 static void __x25_destroy_socket(struct sock *);
 371
 372 /*
 373  *      handler for deferred kills.
 374  */
 375 static void x25_destroy_timer(unsigned long data)
 376 {
 377         x25_destroy_socket_from_timer((struct sock *)data);
 378 }
 379
 380 /*
 381  *      This is called from user mode and the timers. Thus it protects itself
 382  *      against interrupt users but doesn't worry about being called during
 383  *      work. Once it is removed from the queue no interrupt or bottom half
 384  *      will touch it and we are (fairly 8-) ) safe.
 385  *      Not static as it's used by the timer
 386  */
 387 static void __x25_destroy_socket(struct sock *sk)
 388 {
 389         struct sk_buff *skb;
 390
 391         x25_stop_heartbeat(sk);
 392         x25_stop_timer(sk);
 393
 394         x25_remove_socket(sk);
 395         x25_clear_queues(sk);           /* Flush the queues */
 396
 397         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 398                 if (skb->sk != sk) {            /* A pending connection */
 399                         /*
 400                          * Queue the unaccepted socket for death
 401                          */
 402                         skb->sk->sk_state = TCP_LISTEN;
 403                         sock_set_flag(skb->sk, SOCK_DEAD);
 404                         x25_start_heartbeat(skb->sk);
 405                         x25_sk(skb->sk)->state = X25_STATE_0;
 406                 }
 407
 408                 kfree_skb(skb);
 409         }
 410
 411         if (sk_has_allocations(sk)) {
 412                 /* Defer: outstanding buffers */
 413                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 414                 sk->sk_timer.function = x25_destroy_timer;
 415                 sk->sk_timer.data = (unsigned long)sk;
 416                 add_timer(&sk->sk_timer);
 417         } else {
 418                 /* drop last reference so sock_put will free */
 419                 __sock_put(sk);
 420         }
 421 }
 422
 423 void x25_destroy_socket_from_timer(struct sock *sk)
 424 {
 425         sock_hold(sk);
 426         bh_lock_sock(sk);
 427         __x25_destroy_socket(sk);
 428         bh_unlock_sock(sk);
 429         sock_put(sk);
 430 }
 431
 432 /*
 433  *      Handling for system calls applied via the various interfaces to a
 434  *      X.25 socket object.
 435  */
 436
 437 static int x25_setsockopt(struct socket *sock, int level, int optname,
 438                           char __user *optval, unsigned int optlen)
 439 {
 440         int opt;
 441         struct sock *sk = sock->sk;
 442         int rc = -ENOPROTOOPT;
 443
 444         if (level != SOL_X25 || optname != X25_QBITINCL)
 445                 goto out;
 446
 447         rc = -EINVAL;
 448         if (optlen < sizeof(int))
 449                 goto out;
 450
 451         rc = -EFAULT;
 452         if (get_user(opt, (int __user *)optval))
 453                 goto out;
 454
 455         if (opt)
 456                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 457         else
 458                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 459         rc = 0;
 460 out:
 461         return rc;
 462 }
 463
 464 static int x25_getsockopt(struct socket *sock, int level, int optname,
 465                           char __user *optval, int __user *optlen)
 466 {
 467         struct sock *sk = sock->sk;
 468         int val, len, rc = -ENOPROTOOPT;
 469
 470         if (level != SOL_X25 || optname != X25_QBITINCL)
 471                 goto out;
 472
 473         rc = -EFAULT;
 474         if (get_user(len, optlen))
 475                 goto out;
 476
 477         len = min_t(unsigned int, len, sizeof(int));
 478
 479         rc = -EINVAL;
 480         if (len < 0)
 481                 goto out;
 482
 483         rc = -EFAULT;
 484         if (put_user(len, optlen))
 485                 goto out;
 486
 487         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 488         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 489 out:
 490         return rc;
 491 }
 492
 493 static int x25_listen(struct socket *sock, int backlog)
 494 {
 495         struct sock *sk = sock->sk;
 496         int rc = -EOPNOTSUPP;
 497
 498         lock_sock(sk);
 499         if (sk->sk_state != TCP_LISTEN) {
 500                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 501                 sk->sk_max_ack_backlog = backlog;
 502                 sk->sk_state           = TCP_LISTEN;
 503                 rc = 0;
 504         }
 505         release_sock(sk);
 506
 507         return rc;
 508 }
 509
 510 static struct proto x25_proto = {
 511         .name     = "X25",
 512         .owner    = THIS_MODULE,
 513         .obj_size = sizeof(struct x25_sock),
 514 };
 515
 516 static struct sock *x25_alloc_socket(struct net *net, int kern)
 517 {
 518         struct x25_sock *x25;
 519         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 520
 521         if (!sk)
 522                 goto out;
 523
 524         sock_init_data(NULL, sk);
 525
 526         x25 = x25_sk(sk);
 527         skb_queue_head_init(&x25->ack_queue);
 528         skb_queue_head_init(&x25->fragment_queue);
 529         skb_queue_head_init(&x25->interrupt_in_queue);
 530         skb_queue_head_init(&x25->interrupt_out_queue);
 531 out:
 532         return sk;
 533 }
 534
 535 static int x25_create(struct net *net, struct socket *sock, int protocol,
 536                       int kern)
 537 {
 538         struct sock *sk;
 539         struct x25_sock *x25;
 540         int rc = -EAFNOSUPPORT;
 541
 542         if (!net_eq(net, &init_net))
 543                 goto out;
 544
 545         rc = -ESOCKTNOSUPPORT;
 546         if (sock->type != SOCK_SEQPACKET)
 547                 goto out;
 548
 549         rc = -EINVAL;
 550         if (protocol)
 551                 goto out;
 552
 553         rc = -ENOMEM;
 554         if ((sk = x25_alloc_socket(net, kern)) == NULL)
 555                 goto out;
 556
 557         x25 = x25_sk(sk);
 558
 559         sock_init_data(sock, sk);
 560
 561         x25_init_timers(sk);
 562
 563         sock->ops    = &x25_proto_ops;
 564         sk->sk_protocol = protocol;
 565         sk->sk_backlog_rcv = x25_backlog_rcv;
 566
 567         x25->t21   = sysctl_x25_call_request_timeout;
 568         x25->t22   = sysctl_x25_reset_request_timeout;
 569         x25->t23   = sysctl_x25_clear_request_timeout;
 570         x25->t2    = sysctl_x25_ack_holdback_timeout;
 571         x25->state = X25_STATE_0;
 572         x25->cudmatchlength = 0;
 573         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 574                                                         /* on call accept   */
 575
 576         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 577         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 578         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 579         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 580         x25->facilities.throughput  = 0;        /* by default don't negotiate
 581                                                    throughput */
 582         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 583         x25->dte_facilities.calling_len = 0;
 584         x25->dte_facilities.called_len = 0;
 585         memset(x25->dte_facilities.called_ae, '\0',
 586                         sizeof(x25->dte_facilities.called_ae));
 587         memset(x25->dte_facilities.calling_ae, '\0',
 588                         sizeof(x25->dte_facilities.calling_ae));
 589
 590         rc = 0;
 591 out:
 592         return rc;
 593 }
 594
 595 static struct sock *x25_make_new(struct sock *osk)
 596 {
 597         struct sock *sk = NULL;
 598         struct x25_sock *x25, *ox25;
 599
 600         if (osk->sk_type != SOCK_SEQPACKET)
 601                 goto out;
 602
 603         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
 604                 goto out;
 605
 606         x25 = x25_sk(sk);
 607
 608         sk->sk_type        = osk->sk_type;
 609         sk->sk_priority    = osk->sk_priority;
 610         sk->sk_protocol    = osk->sk_protocol;
 611         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 612         sk->sk_sndbuf      = osk->sk_sndbuf;
 613         sk->sk_state       = TCP_ESTABLISHED;
 614         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 615         sock_copy_flags(sk, osk);
 616
 617         ox25 = x25_sk(osk);
 618         x25->t21        = ox25->t21;
 619         x25->t22        = ox25->t22;
 620         x25->t23        = ox25->t23;
 621         x25->t2         = ox25->t2;
 622         x25->flags      = ox25->flags;
 623         x25->facilities = ox25->facilities;
 624         x25->dte_facilities = ox25->dte_facilities;
 625         x25->cudmatchlength = ox25->cudmatchlength;
 626
 627         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 628         x25_init_timers(sk);
 629 out:
 630         return sk;
 631 }
 632
 633 static int x25_release(struct socket *sock)
 634 {
 635         struct sock *sk = sock->sk;
 636         struct x25_sock *x25;
 637
 638         if (!sk)
 639                 return 0;
 640
 641         x25 = x25_sk(sk);
 642
 643         sock_hold(sk);
 644         lock_sock(sk);
 645         switch (x25->state) {
 646
 647                 case X25_STATE_0:
 648                 case X25_STATE_2:
 649                         x25_disconnect(sk, 0, 0, 0);
 650                         __x25_destroy_socket(sk);
 651                         goto out;
 652
 653                 case X25_STATE_1:
 654                 case X25_STATE_3:
 655                 case X25_STATE_4:
 656                         x25_clear_queues(sk);
 657                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 658                         x25_start_t23timer(sk);
 659                         x25->state = X25_STATE_2;
 660                         sk->sk_state    = TCP_CLOSE;
 661                         sk->sk_shutdown |= SEND_SHUTDOWN;
 662                         sk->sk_state_change(sk);
 663                         sock_set_flag(sk, SOCK_DEAD);
 664                         sock_set_flag(sk, SOCK_DESTROY);
 665                         break;
 666         }
 667
 668         sock_orphan(sk);
 669 out:
 670         release_sock(sk);
 671         sock_put(sk);
 672         return 0;
 673 }
 674
 675 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 676 {
 677         struct sock *sk = sock->sk;
 678         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 679         int len, i, rc = 0;
 680
 681         if (addr_len != sizeof(struct sockaddr_x25) ||
 682             addr->sx25_family != AF_X25 ||
 683             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
 684                 rc = -EINVAL;
 685                 goto out;
 686         }
 687
 688         /* check for the null_x25_address */
 689         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
 690
 691                 len = strlen(addr->sx25_addr.x25_addr);
 692                 for (i = 0; i < len; i++) {
 693                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 694                                 rc = -EINVAL;
 695                                 goto out;
 696                         }
 697                 }
 698         }
 699
 700         lock_sock(sk);
 701         if (sock_flag(sk, SOCK_ZAPPED)) {
 702                 x25_sk(sk)->source_addr = addr->sx25_addr;
 703                 x25_insert_socket(sk);
 704                 sock_reset_flag(sk, SOCK_ZAPPED);
 705         } else {
 706                 rc = -EINVAL;
 707         }
 708         release_sock(sk);
 709         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 710 out:
 711         return rc;
 712 }
 713
 714 static int x25_wait_for_connection_establishment(struct sock *sk)
 715 {
 716         DECLARE_WAITQUEUE(wait, current);
 717         int rc;
 718
 719         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 720         for (;;) {
 721                 __set_current_state(TASK_INTERRUPTIBLE);
 722                 rc = -ERESTARTSYS;
 723                 if (signal_pending(current))
 724                         break;
 725                 rc = sock_error(sk);
 726                 if (rc) {
 727                         sk->sk_socket->state = SS_UNCONNECTED;
 728                         break;
 729                 }
 730                 rc = 0;
 731                 if (sk->sk_state != TCP_ESTABLISHED) {
 732                         release_sock(sk);
 733                         schedule();
 734                         lock_sock(sk);
 735                 } else
 736                         break;
 737         }
 738         __set_current_state(TASK_RUNNING);
 739         remove_wait_queue(sk_sleep(sk), &wait);
 740         return rc;
 741 }
 742
 743 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 744                        int addr_len, int flags)
 745 {
 746         struct sock *sk = sock->sk;
 747         struct x25_sock *x25 = x25_sk(sk);
 748         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 749         struct x25_route *rt;
 750         int rc = 0;
 751
 752         lock_sock(sk);
 753         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 754                 sock->state = SS_CONNECTED;
 755                 goto out; /* Connect completed during a ERESTARTSYS event */
 756         }
 757
 758         rc = -ECONNREFUSED;
 759         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 760                 sock->state = SS_UNCONNECTED;
 761                 goto out;
 762         }
 763
 764         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 765         if (sk->sk_state == TCP_ESTABLISHED)
 766                 goto out;
 767
 768         rc = -EALREADY; /* Do nothing if call is already in progress */
 769         if (sk->sk_state == TCP_SYN_SENT)
 770                 goto out;
 771
 772         sk->sk_state   = TCP_CLOSE;
 773         sock->state = SS_UNCONNECTED;
 774
 775         rc = -EINVAL;
 776         if (addr_len != sizeof(struct sockaddr_x25) ||
 777             addr->sx25_family != AF_X25 ||
 778             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
 779                 goto out;
 780
 781         rc = -ENETUNREACH;
 782         rt = x25_get_route(&addr->sx25_addr);
 783         if (!rt)
 784                 goto out;
 785
 786         x25->neighbour = x25_get_neigh(rt->dev);
 787         if (!x25->neighbour)
 788                 goto out_put_route;
 789
 790         x25_limit_facilities(&x25->facilities, x25->neighbour);
 791
 792         x25->lci = x25_new_lci(x25->neighbour);
 793         if (!x25->lci)
 794                 goto out_put_neigh;
 795
 796         rc = -EINVAL;
 797         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 798                 goto out_put_neigh;
 799
 800         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 801                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 802
 803         x25->dest_addr = addr->sx25_addr;
 804
 805         /* Move to connecting socket, start sending Connect Requests */
 806         sock->state   = SS_CONNECTING;
 807         sk->sk_state  = TCP_SYN_SENT;
 808
 809         x25->state = X25_STATE_1;
 810
 811         x25_write_internal(sk, X25_CALL_REQUEST);
 812
 813         x25_start_heartbeat(sk);
 814         x25_start_t21timer(sk);
 815
 816         /* Now the loop */
 817         rc = -EINPROGRESS;
 818         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 819                 goto out;
 820
 821         rc = x25_wait_for_connection_establishment(sk);
 822         if (rc)
 823                 goto out_put_neigh;
 824
 825         sock->state = SS_CONNECTED;
 826         rc = 0;
 827 out_put_neigh:
 828         if (rc && x25->neighbour) {
 829                 read_lock_bh(&x25_list_lock);
 830                 x25_neigh_put(x25->neighbour);
 831                 x25->neighbour = NULL;
 832                 read_unlock_bh(&x25_list_lock);
 833                 x25->state = X25_STATE_0;
 834         }
 835 out_put_route:
 836         x25_route_put(rt);
 837 out:
 838         release_sock(sk);
 839         return rc;
 840 }
 841
 842 static int x25_wait_for_data(struct sock *sk, long timeout)
 843 {
 844         DECLARE_WAITQUEUE(wait, current);
 845         int rc = 0;
 846
 847         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 848         for (;;) {
 849                 __set_current_state(TASK_INTERRUPTIBLE);
 850                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 851                         break;
 852                 rc = -ERESTARTSYS;
 853                 if (signal_pending(current))
 854                         break;
 855                 rc = -EAGAIN;
 856                 if (!timeout)
 857                         break;
 858                 rc = 0;
 859                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 860                         release_sock(sk);
 861                         timeout = schedule_timeout(timeout);
 862                         lock_sock(sk);
 863                 } else
 864                         break;
 865         }
 866         __set_current_state(TASK_RUNNING);
 867         remove_wait_queue(sk_sleep(sk), &wait);
 868         return rc;
 869 }
 870
 871 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 872                       bool kern)
 873 {
 874         struct sock *sk = sock->sk;
 875         struct sock *newsk;
 876         struct sk_buff *skb;
 877         int rc = -EINVAL;
 878
 879         if (!sk)
 880                 goto out;
 881
 882         rc = -EOPNOTSUPP;
 883         if (sk->sk_type != SOCK_SEQPACKET)
 884                 goto out;
 885
 886         lock_sock(sk);
 887         rc = -EINVAL;
 888         if (sk->sk_state != TCP_LISTEN)
 889                 goto out2;
 890
 891         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 892         if (rc)
 893                 goto out2;
 894         skb = skb_dequeue(&sk->sk_receive_queue);
 895         rc = -EINVAL;
 896         if (!skb->sk)
 897                 goto out2;
 898         newsk            = skb->sk;
 899         sock_graft(newsk, newsock);
 900
 901         /* Now attach up the new socket */
 902         skb->sk = NULL;
 903         kfree_skb(skb);
 904         sk->sk_ack_backlog--;
 905         newsock->state = SS_CONNECTED;
 906         rc = 0;
 907 out2:
 908         release_sock(sk);
 909 out:
 910         return rc;
 911 }
 912
 913 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 914                        int *uaddr_len, int peer)
 915 {
 916         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 917         struct sock *sk = sock->sk;
 918         struct x25_sock *x25 = x25_sk(sk);
 919         int rc = 0;
 920
 921         if (peer) {
 922                 if (sk->sk_state != TCP_ESTABLISHED) {
 923                         rc = -ENOTCONN;
 924                         goto out;
 925                 }
 926                 sx25->sx25_addr = x25->dest_addr;
 927         } else
 928                 sx25->sx25_addr = x25->source_addr;
 929
 930         sx25->sx25_family = AF_X25;
 931         *uaddr_len = sizeof(*sx25);
 932
 933 out:
 934         return rc;
 935 }
 936
 937 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 938                         unsigned int lci)
 939 {
 940         struct sock *sk;
 941         struct sock *make;
 942         struct x25_sock *makex25;
 943         struct x25_address source_addr, dest_addr;
 944         struct x25_facilities facilities;
 945         struct x25_dte_facilities dte_facilities;
 946         int len, addr_len, rc;
 947
 948         /*
 949          *      Remove the LCI and frame type.
 950          */
 951         skb_pull(skb, X25_STD_MIN_LEN);
 952
 953         /*
 954          *      Extract the X.25 addresses and convert them to ASCII strings,
 955          *      and remove them.
 956          *
 957          *      Address block is mandatory in call request packets
 958          */
 959         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 960         if (addr_len <= 0)
 961                 goto out_clear_request;
 962         skb_pull(skb, addr_len);
 963
 964         /*
 965          *      Get the length of the facilities, skip past them for the moment
 966          *      get the call user data because this is needed to determine
 967          *      the correct listener
 968          *
 969          *      Facilities length is mandatory in call request packets
 970          */
 971         if (!pskb_may_pull(skb, 1))
 972                 goto out_clear_request;
 973         len = skb->data[0] + 1;
 974         if (!pskb_may_pull(skb, len))
 975                 goto out_clear_request;
 976         skb_pull(skb,len);
 977
 978         /*
 979          *      Ensure that the amount of call user data is valid.
 980          */
 981         if (skb->len > X25_MAX_CUD_LEN)
 982                 goto out_clear_request;
 983
 984         /*
 985          *      Get all the call user data so it can be used in
 986          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 987          */
 988         if (!pskb_may_pull(skb, skb->len))
 989                 goto out_clear_request;
 990
 991         /*
 992          *      Find a listener for the particular address/cud pair.
 993          */
 994         sk = x25_find_listener(&source_addr,skb);
 995         skb_push(skb,len);
 996
 997         if (sk != NULL && sk_acceptq_is_full(sk)) {
 998                 goto out_sock_put;
 999         }
1000
1001         /*
1002          *      We dont have any listeners for this incoming call.
1003          *      Try forwarding it.
1004          */
1005         if (sk == NULL) {
1006                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1007                 if (sysctl_x25_forward &&
1008                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1009                 {
1010                         /* Call was forwarded, dont process it any more */
1011                         kfree_skb(skb);
1012                         rc = 1;
1013                         goto out;
1014                 } else {
1015                         /* No listeners, can't forward, clear the call */
1016                         goto out_clear_request;
1017                 }
1018         }
1019
1020         /*
1021          *      Try to reach a compromise on the requested facilities.
1022          */
1023         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1024         if (len == -1)
1025                 goto out_sock_put;
1026
1027         /*
1028          * current neighbour/link might impose additional limits
1029          * on certain facilties
1030          */
1031
1032         x25_limit_facilities(&facilities, nb);
1033
1034         /*
1035          *      Try to create a new socket.
1036          */
1037         make = x25_make_new(sk);
1038         if (!make)
1039                 goto out_sock_put;
1040
1041         /*
1042          *      Remove the facilities
1043          */
1044         skb_pull(skb, len);
1045
1046         skb->sk     = make;
1047         make->sk_state = TCP_ESTABLISHED;
1048
1049         makex25 = x25_sk(make);
1050         makex25->lci           = lci;
1051         makex25->dest_addr     = dest_addr;
1052         makex25->source_addr   = source_addr;
1053         x25_neigh_hold(nb);
1054         makex25->neighbour     = nb;
1055         makex25->facilities    = facilities;
1056         makex25->dte_facilities= dte_facilities;
1057         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1058         /* ensure no reverse facil on accept */
1059         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1060         /* ensure no calling address extension on accept */
1061         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1062         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1063
1064         /* Normally all calls are accepted immediately */
1065         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1066                 x25_write_internal(make, X25_CALL_ACCEPTED);
1067                 makex25->state = X25_STATE_3;
1068         }
1069
1070         /*
1071          *      Incoming Call User Data.
1072          */
1073         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1074         makex25->calluserdata.cudlength = skb->len;
1075
1076         sk->sk_ack_backlog++;
1077
1078         x25_insert_socket(make);
1079
1080         skb_queue_head(&sk->sk_receive_queue, skb);
1081
1082         x25_start_heartbeat(make);
1083
1084         if (!sock_flag(sk, SOCK_DEAD))
1085                 sk->sk_data_ready(sk);
1086         rc = 1;
1087         sock_put(sk);
1088 out:
1089         return rc;
1090 out_sock_put:
1091         sock_put(sk);
1092 out_clear_request:
1093         rc = 0;
1094         x25_transmit_clear_request(nb, lci, 0x01);
1095         goto out;
1096 }
1097
1098 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1099 {
1100         struct sock *sk = sock->sk;
1101         struct x25_sock *x25 = x25_sk(sk);
1102         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1103         struct sockaddr_x25 sx25;
1104         struct sk_buff *skb;
1105         unsigned char *asmptr;
1106         int noblock = msg->msg_flags & MSG_DONTWAIT;
1107         size_t size;
1108         int qbit = 0, rc = -EINVAL;
1109
1110         lock_sock(sk);
1111         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1112                 goto out;
1113
1114         /* we currently don't support segmented records at the user interface */
1115         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1116                 goto out;
1117
1118         rc = -EADDRNOTAVAIL;
1119         if (sock_flag(sk, SOCK_ZAPPED))
1120                 goto out;
1121
1122         rc = -EPIPE;
1123         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1124                 send_sig(SIGPIPE, current, 0);
1125                 goto out;
1126         }
1127
1128         rc = -ENETUNREACH;
1129         if (!x25->neighbour)
1130                 goto out;
1131
1132         if (usx25) {
1133                 rc = -EINVAL;
1134                 if (msg->msg_namelen < sizeof(sx25))
1135                         goto out;
1136                 memcpy(&sx25, usx25, sizeof(sx25));
1137                 rc = -EISCONN;
1138                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1139                         goto out;
1140                 rc = -EINVAL;
1141                 if (sx25.sx25_family != AF_X25)
1142                         goto out;
1143         } else {
1144                 /*
1145                  *      FIXME 1003.1g - if the socket is like this because
1146                  *      it has become closed (not started closed) we ought
1147                  *      to SIGPIPE, EPIPE;
1148                  */
1149                 rc = -ENOTCONN;
1150                 if (sk->sk_state != TCP_ESTABLISHED)
1151                         goto out;
1152
1153                 sx25.sx25_family = AF_X25;
1154                 sx25.sx25_addr   = x25->dest_addr;
1155         }
1156
1157         /* Sanity check the packet size */
1158         if (len > 65535) {
1159                 rc = -EMSGSIZE;
1160                 goto out;
1161         }
1162
1163         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1164
1165         /* Build a packet */
1166         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1167
1168         if ((msg->msg_flags & MSG_OOB) && len > 32)
1169                 len = 32;
1170
1171         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1172
1173         release_sock(sk);
1174         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1175         lock_sock(sk);
1176         if (!skb)
1177                 goto out;
1178         X25_SKB_CB(skb)->flags = msg->msg_flags;
1179
1180         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1181
1182         /*
1183          *      Put the data on the end
1184          */
1185         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1186
1187         skb_reset_transport_header(skb);
1188         skb_put(skb, len);
1189
1190         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1191         if (rc)
1192                 goto out_kfree_skb;
1193
1194         /*
1195          *      If the Q BIT Include socket option is in force, the first
1196          *      byte of the user data is the logical value of the Q Bit.
1197          */
1198         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1199                 if (!pskb_may_pull(skb, 1))
1200                         goto out_kfree_skb;
1201
1202                 qbit = skb->data[0];
1203                 skb_pull(skb, 1);
1204         }
1205
1206         /*
1207          *      Push down the X.25 header
1208          */
1209         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1210
1211         if (msg->msg_flags & MSG_OOB) {
1212                 if (x25->neighbour->extended) {
1213                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1214                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1215                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1216                         *asmptr++ = X25_INTERRUPT;
1217                 } else {
1218                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1219                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1220                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1221                         *asmptr++ = X25_INTERRUPT;
1222                 }
1223         } else {
1224                 if (x25->neighbour->extended) {
1225                         /* Build an Extended X.25 header */
1226                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1227                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1228                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1229                         *asmptr++ = X25_DATA;
1230                         *asmptr++ = X25_DATA;
1231                 } else {
1232                         /* Build an Standard X.25 header */
1233                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1234                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1235                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1236                         *asmptr++ = X25_DATA;
1237                 }
1238
1239                 if (qbit)
1240                         skb->data[0] |= X25_Q_BIT;
1241         }
1242
1243         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1244         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1245
1246         rc = -ENOTCONN;
1247         if (sk->sk_state != TCP_ESTABLISHED)
1248                 goto out_kfree_skb;
1249
1250         if (msg->msg_flags & MSG_OOB)
1251                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1252         else {
1253                 rc = x25_output(sk, skb);
1254                 len = rc;
1255                 if (rc < 0)
1256                         kfree_skb(skb);
1257                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1258                         len++;
1259         }
1260
1261         x25_kick(sk);
1262         rc = len;
1263 out:
1264         release_sock(sk);
1265         return rc;
1266 out_kfree_skb:
1267         kfree_skb(skb);
1268         goto out;
1269 }
1270
1271
1272 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1273                        int flags)
1274 {
1275         struct sock *sk = sock->sk;
1276         struct x25_sock *x25 = x25_sk(sk);
1277         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1278         size_t copied;
1279         int qbit, header_len;
1280         struct sk_buff *skb;
1281         unsigned char *asmptr;
1282         int rc = -ENOTCONN;
1283
1284         lock_sock(sk);
1285
1286         if (x25->neighbour == NULL)
1287                 goto out;
1288
1289         header_len = x25->neighbour->extended ?
1290                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1291
1292         /*
1293          * This works for seqpacket too. The receiver has ordered the queue for
1294          * us! We do one quick check first though
1295          */
1296         if (sk->sk_state != TCP_ESTABLISHED)
1297                 goto out;
1298
1299         if (flags & MSG_OOB) {
1300                 rc = -EINVAL;
1301                 if (sock_flag(sk, SOCK_URGINLINE) ||
1302                     !skb_peek(&x25->interrupt_in_queue))
1303                         goto out;
1304
1305                 skb = skb_dequeue(&x25->interrupt_in_queue);
1306
1307                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1308                         goto out_free_dgram;
1309
1310                 skb_pull(skb, X25_STD_MIN_LEN);
1311
1312                 /*
1313                  *      No Q bit information on Interrupt data.
1314                  */
1315                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1316                         asmptr  = skb_push(skb, 1);
1317                         *asmptr = 0x00;
1318                 }
1319
1320                 msg->msg_flags |= MSG_OOB;
1321         } else {
1322                 /* Now we can treat all alike */
1323                 release_sock(sk);
1324                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1325                                         flags & MSG_DONTWAIT, &rc);
1326                 lock_sock(sk);
1327                 if (!skb)
1328                         goto out;
1329
1330                 if (!pskb_may_pull(skb, header_len))
1331                         goto out_free_dgram;
1332
1333                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1334
1335                 skb_pull(skb, header_len);
1336
1337                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1338                         asmptr  = skb_push(skb, 1);
1339                         *asmptr = qbit;
1340                 }
1341         }
1342
1343         skb_reset_transport_header(skb);
1344         copied = skb->len;
1345
1346         if (copied > size) {
1347                 copied = size;
1348                 msg->msg_flags |= MSG_TRUNC;
1349         }
1350
1351         /* Currently, each datagram always contains a complete record */
1352         msg->msg_flags |= MSG_EOR;
1353
1354         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1355         if (rc)
1356                 goto out_free_dgram;
1357
1358         if (sx25) {
1359                 sx25->sx25_family = AF_X25;
1360                 sx25->sx25_addr   = x25->dest_addr;
1361                 msg->msg_namelen = sizeof(*sx25);
1362         }
1363
1364         x25_check_rbuf(sk);
1365         rc = copied;
1366 out_free_dgram:
1367         skb_free_datagram(sk, skb);
1368 out:
1369         release_sock(sk);
1370         return rc;
1371 }
1372
1373
1374 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1375 {
1376         struct sock *sk = sock->sk;
1377         struct x25_sock *x25 = x25_sk(sk);
1378         void __user *argp = (void __user *)arg;
1379         int rc;
1380
1381         switch (cmd) {
1382         case TIOCOUTQ: {
1383                 int amount;
1384
1385                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1386                 if (amount < 0)
1387                         amount = 0;
1388                 rc = put_user(amount, (unsigned int __user *)argp);
1389                 break;
1390         }
1391
1392         case TIOCINQ: {
1393                 struct sk_buff *skb;
1394                 int amount = 0;
1395                 /*
1396                  * These two are safe on a single CPU system as
1397                  * only user tasks fiddle here
1398                  */
1399                 lock_sock(sk);
1400                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1401                         amount = skb->len;
1402                 release_sock(sk);
1403                 rc = put_user(amount, (unsigned int __user *)argp);
1404                 break;
1405         }
1406
1407         case SIOCGSTAMP:
1408                 rc = -EINVAL;
1409                 if (sk)
1410                         rc = sock_get_timestamp(sk,
1411                                                 (struct timeval __user *)argp);
1412                 break;
1413         case SIOCGSTAMPNS:
1414                 rc = -EINVAL;
1415                 if (sk)
1416                         rc = sock_get_timestampns(sk,
1417                                         (struct timespec __user *)argp);
1418                 break;
1419         case SIOCGIFADDR:
1420         case SIOCSIFADDR:
1421         case SIOCGIFDSTADDR:
1422         case SIOCSIFDSTADDR:
1423         case SIOCGIFBRDADDR:
1424         case SIOCSIFBRDADDR:
1425         case SIOCGIFNETMASK:
1426         case SIOCSIFNETMASK:
1427         case SIOCGIFMETRIC:
1428         case SIOCSIFMETRIC:
1429                 rc = -EINVAL;
1430                 break;
1431         case SIOCADDRT:
1432         case SIOCDELRT:
1433                 rc = -EPERM;
1434                 if (!capable(CAP_NET_ADMIN))
1435                         break;
1436                 rc = x25_route_ioctl(cmd, argp);
1437                 break;
1438         case SIOCX25GSUBSCRIP:
1439                 rc = x25_subscr_ioctl(cmd, argp);
1440                 break;
1441         case SIOCX25SSUBSCRIP:
1442                 rc = -EPERM;
1443                 if (!capable(CAP_NET_ADMIN))
1444                         break;
1445                 rc = x25_subscr_ioctl(cmd, argp);
1446                 break;
1447         case SIOCX25GFACILITIES: {
1448                 lock_sock(sk);
1449                 rc = copy_to_user(argp, &x25->facilities,
1450                                   sizeof(x25->facilities))
1451                         ? -EFAULT : 0;
1452                 release_sock(sk);
1453                 break;
1454         }
1455
1456         case SIOCX25SFACILITIES: {
1457                 struct x25_facilities facilities;
1458                 rc = -EFAULT;
1459                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1460                         break;
1461                 rc = -EINVAL;
1462                 lock_sock(sk);
1463                 if (sk->sk_state != TCP_LISTEN &&
1464                     sk->sk_state != TCP_CLOSE)
1465                         goto out_fac_release;
1466                 if (facilities.pacsize_in < X25_PS16 ||
1467                     facilities.pacsize_in > X25_PS4096)
1468                         goto out_fac_release;
1469                 if (facilities.pacsize_out < X25_PS16 ||
1470                     facilities.pacsize_out > X25_PS4096)
1471                         goto out_fac_release;
1472                 if (facilities.winsize_in < 1 ||
1473                     facilities.winsize_in > 127)
1474                         goto out_fac_release;
1475                 if (facilities.throughput) {
1476                         int out = facilities.throughput & 0xf0;
1477                         int in  = facilities.throughput & 0x0f;
1478                         if (!out)
1479                                 facilities.throughput |=
1480                                         X25_DEFAULT_THROUGHPUT << 4;
1481                         else if (out < 0x30 || out > 0xD0)
1482                                 goto out_fac_release;
1483                         if (!in)
1484                                 facilities.throughput |=
1485                                         X25_DEFAULT_THROUGHPUT;
1486                         else if (in < 0x03 || in > 0x0D)
1487                                 goto out_fac_release;
1488                 }
1489                 if (facilities.reverse &&
1490                     (facilities.reverse & 0x81) != 0x81)
1491                         goto out_fac_release;
1492                 x25->facilities = facilities;
1493                 rc = 0;
1494 out_fac_release:
1495                 release_sock(sk);
1496                 break;
1497         }
1498
1499         case SIOCX25GDTEFACILITIES: {
1500                 lock_sock(sk);
1501                 rc = copy_to_user(argp, &x25->dte_facilities,
1502                                   sizeof(x25->dte_facilities));
1503                 release_sock(sk);
1504                 if (rc)
1505                         rc = -EFAULT;
1506                 break;
1507         }
1508
1509         case SIOCX25SDTEFACILITIES: {
1510                 struct x25_dte_facilities dtefacs;
1511                 rc = -EFAULT;
1512                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1513                         break;
1514                 rc = -EINVAL;
1515                 lock_sock(sk);
1516                 if (sk->sk_state != TCP_LISTEN &&
1517                     sk->sk_state != TCP_CLOSE)
1518                         goto out_dtefac_release;
1519                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1520                         goto out_dtefac_release;
1521                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1522                         goto out_dtefac_release;
1523                 x25->dte_facilities = dtefacs;
1524                 rc = 0;
1525 out_dtefac_release:
1526                 release_sock(sk);
1527                 break;
1528         }
1529
1530         case SIOCX25GCALLUSERDATA: {
1531                 lock_sock(sk);
1532                 rc = copy_to_user(argp, &x25->calluserdata,
1533                                   sizeof(x25->calluserdata))
1534                         ? -EFAULT : 0;
1535                 release_sock(sk);
1536                 break;
1537         }
1538
1539         case SIOCX25SCALLUSERDATA: {
1540                 struct x25_calluserdata calluserdata;
1541
1542                 rc = -EFAULT;
1543                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1544                         break;
1545                 rc = -EINVAL;
1546                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1547                         break;
1548                 lock_sock(sk);
1549                 x25->calluserdata = calluserdata;
1550                 release_sock(sk);
1551                 rc = 0;
1552                 break;
1553         }
1554
1555         case SIOCX25GCAUSEDIAG: {
1556                 lock_sock(sk);
1557                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1558                         ? -EFAULT : 0;
1559                 release_sock(sk);
1560                 break;
1561         }
1562
1563         case SIOCX25SCAUSEDIAG: {
1564                 struct x25_causediag causediag;
1565                 rc = -EFAULT;
1566                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1567                         break;
1568                 lock_sock(sk);
1569                 x25->causediag = causediag;
1570                 release_sock(sk);
1571                 rc = 0;
1572                 break;
1573
1574         }
1575
1576         case SIOCX25SCUDMATCHLEN: {
1577                 struct x25_subaddr sub_addr;
1578                 rc = -EINVAL;
1579                 lock_sock(sk);
1580                 if(sk->sk_state != TCP_CLOSE)
1581                         goto out_cud_release;
1582                 rc = -EFAULT;
1583                 if (copy_from_user(&sub_addr, argp,
1584                                    sizeof(sub_addr)))
1585                         goto out_cud_release;
1586                 rc = -EINVAL;
1587                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1588                         goto out_cud_release;
1589                 x25->cudmatchlength = sub_addr.cudmatchlength;
1590                 rc = 0;
1591 out_cud_release:
1592                 release_sock(sk);
1593                 break;
1594         }
1595
1596         case SIOCX25CALLACCPTAPPRV: {
1597                 rc = -EINVAL;
1598                 lock_sock(sk);
1599                 if (sk->sk_state == TCP_CLOSE) {
1600                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1601                         rc = 0;
1602                 }
1603                 release_sock(sk);
1604                 break;
1605         }
1606
1607         case SIOCX25SENDCALLACCPT:  {
1608                 rc = -EINVAL;
1609                 lock_sock(sk);
1610                 if (sk->sk_state != TCP_ESTABLISHED)
1611                         goto out_sendcallaccpt_release;
1612                 /* must call accptapprv above */
1613                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1614                         goto out_sendcallaccpt_release;
1615                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1616                 x25->state = X25_STATE_3;
1617                 rc = 0;
1618 out_sendcallaccpt_release:
1619                 release_sock(sk);
1620                 break;
1621         }
1622
1623         default:
1624                 rc = -ENOIOCTLCMD;
1625                 break;
1626         }
1627
1628         return rc;
1629 }
1630
1631 static const struct net_proto_family x25_family_ops = {
1632         .family =       AF_X25,
1633         .create =       x25_create,
1634         .owner  =       THIS_MODULE,
1635 };
1636
1637 #ifdef CONFIG_COMPAT
1638 static int compat_x25_subscr_ioctl(unsigned int cmd,
1639                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1640 {
1641         struct compat_x25_subscrip_struct x25_subscr;
1642         struct x25_neigh *nb;
1643         struct net_device *dev;
1644         int rc = -EINVAL;
1645
1646         rc = -EFAULT;
1647         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1648                 goto out;
1649
1650         rc = -EINVAL;
1651         dev = x25_dev_get(x25_subscr.device);
1652         if (dev == NULL)
1653                 goto out;
1654
1655         nb = x25_get_neigh(dev);
1656         if (nb == NULL)
1657                 goto out_dev_put;
1658
1659         dev_put(dev);
1660
1661         if (cmd == SIOCX25GSUBSCRIP) {
1662                 read_lock_bh(&x25_neigh_list_lock);
1663                 x25_subscr.extended = nb->extended;
1664                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1665                 read_unlock_bh(&x25_neigh_list_lock);
1666                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1667                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1668         } else {
1669                 rc = -EINVAL;
1670                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1671                         rc = 0;
1672                         write_lock_bh(&x25_neigh_list_lock);
1673                         nb->extended = x25_subscr.extended;
1674                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1675                         write_unlock_bh(&x25_neigh_list_lock);
1676                 }
1677         }
1678         x25_neigh_put(nb);
1679 out:
1680         return rc;
1681 out_dev_put:
1682         dev_put(dev);
1683         goto out;
1684 }
1685
1686 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1687                                 unsigned long arg)
1688 {
1689         void __user *argp = compat_ptr(arg);
1690         struct sock *sk = sock->sk;
1691
1692         int rc = -ENOIOCTLCMD;
1693
1694         switch(cmd) {
1695         case TIOCOUTQ:
1696         case TIOCINQ:
1697                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1698                 break;
1699         case SIOCGSTAMP:
1700                 rc = -EINVAL;
1701                 if (sk)
1702                         rc = compat_sock_get_timestamp(sk,
1703                                         (struct timeval __user*)argp);
1704                 break;
1705         case SIOCGSTAMPNS:
1706                 rc = -EINVAL;
1707                 if (sk)
1708                         rc = compat_sock_get_timestampns(sk,
1709                                         (struct timespec __user*)argp);
1710                 break;
1711         case SIOCGIFADDR:
1712         case SIOCSIFADDR:
1713         case SIOCGIFDSTADDR:
1714         case SIOCSIFDSTADDR:
1715         case SIOCGIFBRDADDR:
1716         case SIOCSIFBRDADDR:
1717         case SIOCGIFNETMASK:
1718         case SIOCSIFNETMASK:
1719         case SIOCGIFMETRIC:
1720         case SIOCSIFMETRIC:
1721                 rc = -EINVAL;
1722                 break;
1723         case SIOCADDRT:
1724         case SIOCDELRT:
1725                 rc = -EPERM;
1726                 if (!capable(CAP_NET_ADMIN))
1727                         break;
1728                 rc = x25_route_ioctl(cmd, argp);
1729                 break;
1730         case SIOCX25GSUBSCRIP:
1731                 rc = compat_x25_subscr_ioctl(cmd, argp);
1732                 break;
1733         case SIOCX25SSUBSCRIP:
1734                 rc = -EPERM;
1735                 if (!capable(CAP_NET_ADMIN))
1736                         break;
1737                 rc = compat_x25_subscr_ioctl(cmd, argp);
1738                 break;
1739         case SIOCX25GFACILITIES:
1740         case SIOCX25SFACILITIES:
1741         case SIOCX25GDTEFACILITIES:
1742         case SIOCX25SDTEFACILITIES:
1743         case SIOCX25GCALLUSERDATA:
1744         case SIOCX25SCALLUSERDATA:
1745         case SIOCX25GCAUSEDIAG:
1746         case SIOCX25SCAUSEDIAG:
1747         case SIOCX25SCUDMATCHLEN:
1748         case SIOCX25CALLACCPTAPPRV:
1749         case SIOCX25SENDCALLACCPT:
1750                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1751                 break;
1752         default:
1753                 rc = -ENOIOCTLCMD;
1754                 break;
1755         }
1756         return rc;
1757 }
1758 #endif
1759
1760 static const struct proto_ops x25_proto_ops = {
1761         .family =       AF_X25,
1762         .owner =        THIS_MODULE,
1763         .release =      x25_release,
1764         .bind =         x25_bind,
1765         .connect =      x25_connect,
1766         .socketpair =   sock_no_socketpair,
1767         .accept =       x25_accept,
1768         .getname =      x25_getname,
1769         .poll =         datagram_poll,
1770         .ioctl =        x25_ioctl,
1771 #ifdef CONFIG_COMPAT
1772         .compat_ioctl = compat_x25_ioctl,
1773 #endif
1774         .listen =       x25_listen,
1775         .shutdown =     sock_no_shutdown,
1776         .setsockopt =   x25_setsockopt,
1777         .getsockopt =   x25_getsockopt,
1778         .sendmsg =      x25_sendmsg,
1779         .recvmsg =      x25_recvmsg,
1780         .mmap =         sock_no_mmap,
1781         .sendpage =     sock_no_sendpage,
1782 };
1783
1784 static struct packet_type x25_packet_type __read_mostly = {
1785         .type = cpu_to_be16(ETH_P_X25),
1786         .func = x25_lapb_receive_frame,
1787 };
1788
1789 static struct notifier_block x25_dev_notifier = {
1790         .notifier_call = x25_device_event,
1791 };
1792
1793 void x25_kill_by_neigh(struct x25_neigh *nb)
1794 {
1795         struct sock *s;
1796
1797         write_lock_bh(&x25_list_lock);
1798
1799         sk_for_each(s, &x25_list)
1800                 if (x25_sk(s)->neighbour == nb)
1801                         x25_disconnect(s, ENETUNREACH, 0, 0);
1802
1803         write_unlock_bh(&x25_list_lock);
1804
1805         /* Remove any related forwards */
1806         x25_clear_forward_by_dev(nb->dev);
1807 }
1808
1809 static int __init x25_init(void)
1810 {
1811         int rc;
1812
1813         rc = proto_register(&x25_proto, 0);
1814         if (rc)
1815                 goto out;
1816
1817         rc = sock_register(&x25_family_ops);
1818         if (rc)
1819                 goto out_proto;
1820
1821         dev_add_pack(&x25_packet_type);
1822
1823         rc = register_netdevice_notifier(&x25_dev_notifier);
1824         if (rc)
1825                 goto out_sock;
1826
1827         rc = x25_register_sysctl();
1828         if (rc)
1829                 goto out_dev;
1830
1831         rc = x25_proc_init();
1832         if (rc)
1833                 goto out_sysctl;
1834
1835         pr_info("Linux Version 0.2\n");
1836
1837 out:
1838         return rc;
1839 out_sysctl:
1840         x25_unregister_sysctl();
1841 out_dev:
1842         unregister_netdevice_notifier(&x25_dev_notifier);
1843 out_sock:
1844         dev_remove_pack(&x25_packet_type);
1845         sock_unregister(AF_X25);
1846 out_proto:
1847         proto_unregister(&x25_proto);
1848         goto out;
1849 }
1850 module_init(x25_init);
1851
1852 static void __exit x25_exit(void)
1853 {
1854         x25_proc_exit();
1855         x25_link_free();
1856         x25_route_free();
1857
1858         x25_unregister_sysctl();
1859
1860         unregister_netdevice_notifier(&x25_dev_notifier);
1861
1862         dev_remove_pack(&x25_packet_type);
1863
1864         sock_unregister(AF_X25);
1865         proto_unregister(&x25_proto);
1866 }
1867 module_exit(x25_exit);
1868
1869 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1870 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1871 MODULE_LICENSE("GPL");
1872 MODULE_ALIAS_NETPROTO(PF_X25);