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.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 <asm/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 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 {
 873         struct sock *sk = sock->sk;
 874         struct sock *newsk;
 875         struct sk_buff *skb;
 876         int rc = -EINVAL;
 877
 878         if (!sk)
 879                 goto out;
 880
 881         rc = -EOPNOTSUPP;
 882         if (sk->sk_type != SOCK_SEQPACKET)
 883                 goto out;
 884
 885         lock_sock(sk);
 886         rc = -EINVAL;
 887         if (sk->sk_state != TCP_LISTEN)
 888                 goto out2;
 889
 890         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 891         if (rc)
 892                 goto out2;
 893         skb = skb_dequeue(&sk->sk_receive_queue);
 894         rc = -EINVAL;
 895         if (!skb->sk)
 896                 goto out2;
 897         newsk            = skb->sk;
 898         sock_graft(newsk, newsock);
 899
 900         /* Now attach up the new socket */
 901         skb->sk = NULL;
 902         kfree_skb(skb);
 903         sk->sk_ack_backlog--;
 904         newsock->state = SS_CONNECTED;
 905         rc = 0;
 906 out2:
 907         release_sock(sk);
 908 out:
 909         return rc;
 910 }
 911
 912 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 913                        int *uaddr_len, int peer)
 914 {
 915         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 916         struct sock *sk = sock->sk;
 917         struct x25_sock *x25 = x25_sk(sk);
 918         int rc = 0;
 919
 920         if (peer) {
 921                 if (sk->sk_state != TCP_ESTABLISHED) {
 922                         rc = -ENOTCONN;
 923                         goto out;
 924                 }
 925                 sx25->sx25_addr = x25->dest_addr;
 926         } else
 927                 sx25->sx25_addr = x25->source_addr;
 928
 929         sx25->sx25_family = AF_X25;
 930         *uaddr_len = sizeof(*sx25);
 931
 932 out:
 933         return rc;
 934 }
 935
 936 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 937                         unsigned int lci)
 938 {
 939         struct sock *sk;
 940         struct sock *make;
 941         struct x25_sock *makex25;
 942         struct x25_address source_addr, dest_addr;
 943         struct x25_facilities facilities;
 944         struct x25_dte_facilities dte_facilities;
 945         int len, addr_len, rc;
 946
 947         /*
 948          *      Remove the LCI and frame type.
 949          */
 950         skb_pull(skb, X25_STD_MIN_LEN);
 951
 952         /*
 953          *      Extract the X.25 addresses and convert them to ASCII strings,
 954          *      and remove them.
 955          *
 956          *      Address block is mandatory in call request packets
 957          */
 958         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 959         if (addr_len <= 0)
 960                 goto out_clear_request;
 961         skb_pull(skb, addr_len);
 962
 963         /*
 964          *      Get the length of the facilities, skip past them for the moment
 965          *      get the call user data because this is needed to determine
 966          *      the correct listener
 967          *
 968          *      Facilities length is mandatory in call request packets
 969          */
 970         if (!pskb_may_pull(skb, 1))
 971                 goto out_clear_request;
 972         len = skb->data[0] + 1;
 973         if (!pskb_may_pull(skb, len))
 974                 goto out_clear_request;
 975         skb_pull(skb,len);
 976
 977         /*
 978          *      Ensure that the amount of call user data is valid.
 979          */
 980         if (skb->len > X25_MAX_CUD_LEN)
 981                 goto out_clear_request;
 982
 983         /*
 984          *      Get all the call user data so it can be used in
 985          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 986          */
 987         if (!pskb_may_pull(skb, skb->len))
 988                 goto out_clear_request;
 989
 990         /*
 991          *      Find a listener for the particular address/cud pair.
 992          */
 993         sk = x25_find_listener(&source_addr,skb);
 994         skb_push(skb,len);
 995
 996         if (sk != NULL && sk_acceptq_is_full(sk)) {
 997                 goto out_sock_put;
 998         }
 999
1000         /*
1001          *      We dont have any listeners for this incoming call.
1002          *      Try forwarding it.
1003          */
1004         if (sk == NULL) {
1005                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1006                 if (sysctl_x25_forward &&
1007                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1008                 {
1009                         /* Call was forwarded, dont process it any more */
1010                         kfree_skb(skb);
1011                         rc = 1;
1012                         goto out;
1013                 } else {
1014                         /* No listeners, can't forward, clear the call */
1015                         goto out_clear_request;
1016                 }
1017         }
1018
1019         /*
1020          *      Try to reach a compromise on the requested facilities.
1021          */
1022         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1023         if (len == -1)
1024                 goto out_sock_put;
1025
1026         /*
1027          * current neighbour/link might impose additional limits
1028          * on certain facilties
1029          */
1030
1031         x25_limit_facilities(&facilities, nb);
1032
1033         /*
1034          *      Try to create a new socket.
1035          */
1036         make = x25_make_new(sk);
1037         if (!make)
1038                 goto out_sock_put;
1039
1040         /*
1041          *      Remove the facilities
1042          */
1043         skb_pull(skb, len);
1044
1045         skb->sk     = make;
1046         make->sk_state = TCP_ESTABLISHED;
1047
1048         makex25 = x25_sk(make);
1049         makex25->lci           = lci;
1050         makex25->dest_addr     = dest_addr;
1051         makex25->source_addr   = source_addr;
1052         x25_neigh_hold(nb);
1053         makex25->neighbour     = nb;
1054         makex25->facilities    = facilities;
1055         makex25->dte_facilities= dte_facilities;
1056         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1057         /* ensure no reverse facil on accept */
1058         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1059         /* ensure no calling address extension on accept */
1060         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1061         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1062
1063         /* Normally all calls are accepted immediately */
1064         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1065                 x25_write_internal(make, X25_CALL_ACCEPTED);
1066                 makex25->state = X25_STATE_3;
1067         }
1068
1069         /*
1070          *      Incoming Call User Data.
1071          */
1072         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1073         makex25->calluserdata.cudlength = skb->len;
1074
1075         sk->sk_ack_backlog++;
1076
1077         x25_insert_socket(make);
1078
1079         skb_queue_head(&sk->sk_receive_queue, skb);
1080
1081         x25_start_heartbeat(make);
1082
1083         if (!sock_flag(sk, SOCK_DEAD))
1084                 sk->sk_data_ready(sk);
1085         rc = 1;
1086         sock_put(sk);
1087 out:
1088         return rc;
1089 out_sock_put:
1090         sock_put(sk);
1091 out_clear_request:
1092         rc = 0;
1093         x25_transmit_clear_request(nb, lci, 0x01);
1094         goto out;
1095 }
1096
1097 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1098 {
1099         struct sock *sk = sock->sk;
1100         struct x25_sock *x25 = x25_sk(sk);
1101         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1102         struct sockaddr_x25 sx25;
1103         struct sk_buff *skb;
1104         unsigned char *asmptr;
1105         int noblock = msg->msg_flags & MSG_DONTWAIT;
1106         size_t size;
1107         int qbit = 0, rc = -EINVAL;
1108
1109         lock_sock(sk);
1110         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1111                 goto out;
1112
1113         /* we currently don't support segmented records at the user interface */
1114         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1115                 goto out;
1116
1117         rc = -EADDRNOTAVAIL;
1118         if (sock_flag(sk, SOCK_ZAPPED))
1119                 goto out;
1120
1121         rc = -EPIPE;
1122         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1123                 send_sig(SIGPIPE, current, 0);
1124                 goto out;
1125         }
1126
1127         rc = -ENETUNREACH;
1128         if (!x25->neighbour)
1129                 goto out;
1130
1131         if (usx25) {
1132                 rc = -EINVAL;
1133                 if (msg->msg_namelen < sizeof(sx25))
1134                         goto out;
1135                 memcpy(&sx25, usx25, sizeof(sx25));
1136                 rc = -EISCONN;
1137                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1138                         goto out;
1139                 rc = -EINVAL;
1140                 if (sx25.sx25_family != AF_X25)
1141                         goto out;
1142         } else {
1143                 /*
1144                  *      FIXME 1003.1g - if the socket is like this because
1145                  *      it has become closed (not started closed) we ought
1146                  *      to SIGPIPE, EPIPE;
1147                  */
1148                 rc = -ENOTCONN;
1149                 if (sk->sk_state != TCP_ESTABLISHED)
1150                         goto out;
1151
1152                 sx25.sx25_family = AF_X25;
1153                 sx25.sx25_addr   = x25->dest_addr;
1154         }
1155
1156         /* Sanity check the packet size */
1157         if (len > 65535) {
1158                 rc = -EMSGSIZE;
1159                 goto out;
1160         }
1161
1162         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1163
1164         /* Build a packet */
1165         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1166
1167         if ((msg->msg_flags & MSG_OOB) && len > 32)
1168                 len = 32;
1169
1170         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1171
1172         release_sock(sk);
1173         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1174         lock_sock(sk);
1175         if (!skb)
1176                 goto out;
1177         X25_SKB_CB(skb)->flags = msg->msg_flags;
1178
1179         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1180
1181         /*
1182          *      Put the data on the end
1183          */
1184         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1185
1186         skb_reset_transport_header(skb);
1187         skb_put(skb, len);
1188
1189         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1190         if (rc)
1191                 goto out_kfree_skb;
1192
1193         /*
1194          *      If the Q BIT Include socket option is in force, the first
1195          *      byte of the user data is the logical value of the Q Bit.
1196          */
1197         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1198                 if (!pskb_may_pull(skb, 1))
1199                         goto out_kfree_skb;
1200
1201                 qbit = skb->data[0];
1202                 skb_pull(skb, 1);
1203         }
1204
1205         /*
1206          *      Push down the X.25 header
1207          */
1208         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1209
1210         if (msg->msg_flags & MSG_OOB) {
1211                 if (x25->neighbour->extended) {
1212                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1213                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1214                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1215                         *asmptr++ = X25_INTERRUPT;
1216                 } else {
1217                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1218                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1219                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1220                         *asmptr++ = X25_INTERRUPT;
1221                 }
1222         } else {
1223                 if (x25->neighbour->extended) {
1224                         /* Build an Extended X.25 header */
1225                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1226                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1227                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1228                         *asmptr++ = X25_DATA;
1229                         *asmptr++ = X25_DATA;
1230                 } else {
1231                         /* Build an Standard X.25 header */
1232                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1233                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1234                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1235                         *asmptr++ = X25_DATA;
1236                 }
1237
1238                 if (qbit)
1239                         skb->data[0] |= X25_Q_BIT;
1240         }
1241
1242         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1243         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1244
1245         rc = -ENOTCONN;
1246         if (sk->sk_state != TCP_ESTABLISHED)
1247                 goto out_kfree_skb;
1248
1249         if (msg->msg_flags & MSG_OOB)
1250                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1251         else {
1252                 rc = x25_output(sk, skb);
1253                 len = rc;
1254                 if (rc < 0)
1255                         kfree_skb(skb);
1256                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1257                         len++;
1258         }
1259
1260         x25_kick(sk);
1261         rc = len;
1262 out:
1263         release_sock(sk);
1264         return rc;
1265 out_kfree_skb:
1266         kfree_skb(skb);
1267         goto out;
1268 }
1269
1270
1271 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1272                        int flags)
1273 {
1274         struct sock *sk = sock->sk;
1275         struct x25_sock *x25 = x25_sk(sk);
1276         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1277         size_t copied;
1278         int qbit, header_len;
1279         struct sk_buff *skb;
1280         unsigned char *asmptr;
1281         int rc = -ENOTCONN;
1282
1283         lock_sock(sk);
1284
1285         if (x25->neighbour == NULL)
1286                 goto out;
1287
1288         header_len = x25->neighbour->extended ?
1289                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1290
1291         /*
1292          * This works for seqpacket too. The receiver has ordered the queue for
1293          * us! We do one quick check first though
1294          */
1295         if (sk->sk_state != TCP_ESTABLISHED)
1296                 goto out;
1297
1298         if (flags & MSG_OOB) {
1299                 rc = -EINVAL;
1300                 if (sock_flag(sk, SOCK_URGINLINE) ||
1301                     !skb_peek(&x25->interrupt_in_queue))
1302                         goto out;
1303
1304                 skb = skb_dequeue(&x25->interrupt_in_queue);
1305
1306                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1307                         goto out_free_dgram;
1308
1309                 skb_pull(skb, X25_STD_MIN_LEN);
1310
1311                 /*
1312                  *      No Q bit information on Interrupt data.
1313                  */
1314                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1315                         asmptr  = skb_push(skb, 1);
1316                         *asmptr = 0x00;
1317                 }
1318
1319                 msg->msg_flags |= MSG_OOB;
1320         } else {
1321                 /* Now we can treat all alike */
1322                 release_sock(sk);
1323                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1324                                         flags & MSG_DONTWAIT, &rc);
1325                 lock_sock(sk);
1326                 if (!skb)
1327                         goto out;
1328
1329                 if (!pskb_may_pull(skb, header_len))
1330                         goto out_free_dgram;
1331
1332                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1333
1334                 skb_pull(skb, header_len);
1335
1336                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1337                         asmptr  = skb_push(skb, 1);
1338                         *asmptr = qbit;
1339                 }
1340         }
1341
1342         skb_reset_transport_header(skb);
1343         copied = skb->len;
1344
1345         if (copied > size) {
1346                 copied = size;
1347                 msg->msg_flags |= MSG_TRUNC;
1348         }
1349
1350         /* Currently, each datagram always contains a complete record */
1351         msg->msg_flags |= MSG_EOR;
1352
1353         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1354         if (rc)
1355                 goto out_free_dgram;
1356
1357         if (sx25) {
1358                 sx25->sx25_family = AF_X25;
1359                 sx25->sx25_addr   = x25->dest_addr;
1360                 msg->msg_namelen = sizeof(*sx25);
1361         }
1362
1363         x25_check_rbuf(sk);
1364         rc = copied;
1365 out_free_dgram:
1366         skb_free_datagram(sk, skb);
1367 out:
1368         release_sock(sk);
1369         return rc;
1370 }
1371
1372
1373 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1374 {
1375         struct sock *sk = sock->sk;
1376         struct x25_sock *x25 = x25_sk(sk);
1377         void __user *argp = (void __user *)arg;
1378         int rc;
1379
1380         switch (cmd) {
1381         case TIOCOUTQ: {
1382                 int amount;
1383
1384                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1385                 if (amount < 0)
1386                         amount = 0;
1387                 rc = put_user(amount, (unsigned int __user *)argp);
1388                 break;
1389         }
1390
1391         case TIOCINQ: {
1392                 struct sk_buff *skb;
1393                 int amount = 0;
1394                 /*
1395                  * These two are safe on a single CPU system as
1396                  * only user tasks fiddle here
1397                  */
1398                 lock_sock(sk);
1399                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1400                         amount = skb->len;
1401                 release_sock(sk);
1402                 rc = put_user(amount, (unsigned int __user *)argp);
1403                 break;
1404         }
1405
1406         case SIOCGSTAMP:
1407                 rc = -EINVAL;
1408                 if (sk)
1409                         rc = sock_get_timestamp(sk,
1410                                                 (struct timeval __user *)argp);
1411                 break;
1412         case SIOCGSTAMPNS:
1413                 rc = -EINVAL;
1414                 if (sk)
1415                         rc = sock_get_timestampns(sk,
1416                                         (struct timespec __user *)argp);
1417                 break;
1418         case SIOCGIFADDR:
1419         case SIOCSIFADDR:
1420         case SIOCGIFDSTADDR:
1421         case SIOCSIFDSTADDR:
1422         case SIOCGIFBRDADDR:
1423         case SIOCSIFBRDADDR:
1424         case SIOCGIFNETMASK:
1425         case SIOCSIFNETMASK:
1426         case SIOCGIFMETRIC:
1427         case SIOCSIFMETRIC:
1428                 rc = -EINVAL;
1429                 break;
1430         case SIOCADDRT:
1431         case SIOCDELRT:
1432                 rc = -EPERM;
1433                 if (!capable(CAP_NET_ADMIN))
1434                         break;
1435                 rc = x25_route_ioctl(cmd, argp);
1436                 break;
1437         case SIOCX25GSUBSCRIP:
1438                 rc = x25_subscr_ioctl(cmd, argp);
1439                 break;
1440         case SIOCX25SSUBSCRIP:
1441                 rc = -EPERM;
1442                 if (!capable(CAP_NET_ADMIN))
1443                         break;
1444                 rc = x25_subscr_ioctl(cmd, argp);
1445                 break;
1446         case SIOCX25GFACILITIES: {
1447                 lock_sock(sk);
1448                 rc = copy_to_user(argp, &x25->facilities,
1449                                   sizeof(x25->facilities))
1450                         ? -EFAULT : 0;
1451                 release_sock(sk);
1452                 break;
1453         }
1454
1455         case SIOCX25SFACILITIES: {
1456                 struct x25_facilities facilities;
1457                 rc = -EFAULT;
1458                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1459                         break;
1460                 rc = -EINVAL;
1461                 lock_sock(sk);
1462                 if (sk->sk_state != TCP_LISTEN &&
1463                     sk->sk_state != TCP_CLOSE)
1464                         goto out_fac_release;
1465                 if (facilities.pacsize_in < X25_PS16 ||
1466                     facilities.pacsize_in > X25_PS4096)
1467                         goto out_fac_release;
1468                 if (facilities.pacsize_out < X25_PS16 ||
1469                     facilities.pacsize_out > X25_PS4096)
1470                         goto out_fac_release;
1471                 if (facilities.winsize_in < 1 ||
1472                     facilities.winsize_in > 127)
1473                         goto out_fac_release;
1474                 if (facilities.throughput) {
1475                         int out = facilities.throughput & 0xf0;
1476                         int in  = facilities.throughput & 0x0f;
1477                         if (!out)
1478                                 facilities.throughput |=
1479                                         X25_DEFAULT_THROUGHPUT << 4;
1480                         else if (out < 0x30 || out > 0xD0)
1481                                 goto out_fac_release;
1482                         if (!in)
1483                                 facilities.throughput |=
1484                                         X25_DEFAULT_THROUGHPUT;
1485                         else if (in < 0x03 || in > 0x0D)
1486                                 goto out_fac_release;
1487                 }
1488                 if (facilities.reverse &&
1489                     (facilities.reverse & 0x81) != 0x81)
1490                         goto out_fac_release;
1491                 x25->facilities = facilities;
1492                 rc = 0;
1493 out_fac_release:
1494                 release_sock(sk);
1495                 break;
1496         }
1497
1498         case SIOCX25GDTEFACILITIES: {
1499                 lock_sock(sk);
1500                 rc = copy_to_user(argp, &x25->dte_facilities,
1501                                   sizeof(x25->dte_facilities));
1502                 release_sock(sk);
1503                 if (rc)
1504                         rc = -EFAULT;
1505                 break;
1506         }
1507
1508         case SIOCX25SDTEFACILITIES: {
1509                 struct x25_dte_facilities dtefacs;
1510                 rc = -EFAULT;
1511                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1512                         break;
1513                 rc = -EINVAL;
1514                 lock_sock(sk);
1515                 if (sk->sk_state != TCP_LISTEN &&
1516                     sk->sk_state != TCP_CLOSE)
1517                         goto out_dtefac_release;
1518                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1519                         goto out_dtefac_release;
1520                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1521                         goto out_dtefac_release;
1522                 x25->dte_facilities = dtefacs;
1523                 rc = 0;
1524 out_dtefac_release:
1525                 release_sock(sk);
1526                 break;
1527         }
1528
1529         case SIOCX25GCALLUSERDATA: {
1530                 lock_sock(sk);
1531                 rc = copy_to_user(argp, &x25->calluserdata,
1532                                   sizeof(x25->calluserdata))
1533                         ? -EFAULT : 0;
1534                 release_sock(sk);
1535                 break;
1536         }
1537
1538         case SIOCX25SCALLUSERDATA: {
1539                 struct x25_calluserdata calluserdata;
1540
1541                 rc = -EFAULT;
1542                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1543                         break;
1544                 rc = -EINVAL;
1545                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1546                         break;
1547                 lock_sock(sk);
1548                 x25->calluserdata = calluserdata;
1549                 release_sock(sk);
1550                 rc = 0;
1551                 break;
1552         }
1553
1554         case SIOCX25GCAUSEDIAG: {
1555                 lock_sock(sk);
1556                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1557                         ? -EFAULT : 0;
1558                 release_sock(sk);
1559                 break;
1560         }
1561
1562         case SIOCX25SCAUSEDIAG: {
1563                 struct x25_causediag causediag;
1564                 rc = -EFAULT;
1565                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1566                         break;
1567                 lock_sock(sk);
1568                 x25->causediag = causediag;
1569                 release_sock(sk);
1570                 rc = 0;
1571                 break;
1572
1573         }
1574
1575         case SIOCX25SCUDMATCHLEN: {
1576                 struct x25_subaddr sub_addr;
1577                 rc = -EINVAL;
1578                 lock_sock(sk);
1579                 if(sk->sk_state != TCP_CLOSE)
1580                         goto out_cud_release;
1581                 rc = -EFAULT;
1582                 if (copy_from_user(&sub_addr, argp,
1583                                    sizeof(sub_addr)))
1584                         goto out_cud_release;
1585                 rc = -EINVAL;
1586                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1587                         goto out_cud_release;
1588                 x25->cudmatchlength = sub_addr.cudmatchlength;
1589                 rc = 0;
1590 out_cud_release:
1591                 release_sock(sk);
1592                 break;
1593         }
1594
1595         case SIOCX25CALLACCPTAPPRV: {
1596                 rc = -EINVAL;
1597                 lock_sock(sk);
1598                 if (sk->sk_state == TCP_CLOSE) {
1599                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1600                         rc = 0;
1601                 }
1602                 release_sock(sk);
1603                 break;
1604         }
1605
1606         case SIOCX25SENDCALLACCPT:  {
1607                 rc = -EINVAL;
1608                 lock_sock(sk);
1609                 if (sk->sk_state != TCP_ESTABLISHED)
1610                         goto out_sendcallaccpt_release;
1611                 /* must call accptapprv above */
1612                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1613                         goto out_sendcallaccpt_release;
1614                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1615                 x25->state = X25_STATE_3;
1616                 rc = 0;
1617 out_sendcallaccpt_release:
1618                 release_sock(sk);
1619                 break;
1620         }
1621
1622         default:
1623                 rc = -ENOIOCTLCMD;
1624                 break;
1625         }
1626
1627         return rc;
1628 }
1629
1630 static const struct net_proto_family x25_family_ops = {
1631         .family =       AF_X25,
1632         .create =       x25_create,
1633         .owner  =       THIS_MODULE,
1634 };
1635
1636 #ifdef CONFIG_COMPAT
1637 static int compat_x25_subscr_ioctl(unsigned int cmd,
1638                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1639 {
1640         struct compat_x25_subscrip_struct x25_subscr;
1641         struct x25_neigh *nb;
1642         struct net_device *dev;
1643         int rc = -EINVAL;
1644
1645         rc = -EFAULT;
1646         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1647                 goto out;
1648
1649         rc = -EINVAL;
1650         dev = x25_dev_get(x25_subscr.device);
1651         if (dev == NULL)
1652                 goto out;
1653
1654         nb = x25_get_neigh(dev);
1655         if (nb == NULL)
1656                 goto out_dev_put;
1657
1658         dev_put(dev);
1659
1660         if (cmd == SIOCX25GSUBSCRIP) {
1661                 read_lock_bh(&x25_neigh_list_lock);
1662                 x25_subscr.extended = nb->extended;
1663                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1664                 read_unlock_bh(&x25_neigh_list_lock);
1665                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1666                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1667         } else {
1668                 rc = -EINVAL;
1669                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1670                         rc = 0;
1671                         write_lock_bh(&x25_neigh_list_lock);
1672                         nb->extended = x25_subscr.extended;
1673                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1674                         write_unlock_bh(&x25_neigh_list_lock);
1675                 }
1676         }
1677         x25_neigh_put(nb);
1678 out:
1679         return rc;
1680 out_dev_put:
1681         dev_put(dev);
1682         goto out;
1683 }
1684
1685 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1686                                 unsigned long arg)
1687 {
1688         void __user *argp = compat_ptr(arg);
1689         struct sock *sk = sock->sk;
1690
1691         int rc = -ENOIOCTLCMD;
1692
1693         switch(cmd) {
1694         case TIOCOUTQ:
1695         case TIOCINQ:
1696                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1697                 break;
1698         case SIOCGSTAMP:
1699                 rc = -EINVAL;
1700                 if (sk)
1701                         rc = compat_sock_get_timestamp(sk,
1702                                         (struct timeval __user*)argp);
1703                 break;
1704         case SIOCGSTAMPNS:
1705                 rc = -EINVAL;
1706                 if (sk)
1707                         rc = compat_sock_get_timestampns(sk,
1708                                         (struct timespec __user*)argp);
1709                 break;
1710         case SIOCGIFADDR:
1711         case SIOCSIFADDR:
1712         case SIOCGIFDSTADDR:
1713         case SIOCSIFDSTADDR:
1714         case SIOCGIFBRDADDR:
1715         case SIOCSIFBRDADDR:
1716         case SIOCGIFNETMASK:
1717         case SIOCSIFNETMASK:
1718         case SIOCGIFMETRIC:
1719         case SIOCSIFMETRIC:
1720                 rc = -EINVAL;
1721                 break;
1722         case SIOCADDRT:
1723         case SIOCDELRT:
1724                 rc = -EPERM;
1725                 if (!capable(CAP_NET_ADMIN))
1726                         break;
1727                 rc = x25_route_ioctl(cmd, argp);
1728                 break;
1729         case SIOCX25GSUBSCRIP:
1730                 rc = compat_x25_subscr_ioctl(cmd, argp);
1731                 break;
1732         case SIOCX25SSUBSCRIP:
1733                 rc = -EPERM;
1734                 if (!capable(CAP_NET_ADMIN))
1735                         break;
1736                 rc = compat_x25_subscr_ioctl(cmd, argp);
1737                 break;
1738         case SIOCX25GFACILITIES:
1739         case SIOCX25SFACILITIES:
1740         case SIOCX25GDTEFACILITIES:
1741         case SIOCX25SDTEFACILITIES:
1742         case SIOCX25GCALLUSERDATA:
1743         case SIOCX25SCALLUSERDATA:
1744         case SIOCX25GCAUSEDIAG:
1745         case SIOCX25SCAUSEDIAG:
1746         case SIOCX25SCUDMATCHLEN:
1747         case SIOCX25CALLACCPTAPPRV:
1748         case SIOCX25SENDCALLACCPT:
1749                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1750                 break;
1751         default:
1752                 rc = -ENOIOCTLCMD;
1753                 break;
1754         }
1755         return rc;
1756 }
1757 #endif
1758
1759 static const struct proto_ops x25_proto_ops = {
1760         .family =       AF_X25,
1761         .owner =        THIS_MODULE,
1762         .release =      x25_release,
1763         .bind =         x25_bind,
1764         .connect =      x25_connect,
1765         .socketpair =   sock_no_socketpair,
1766         .accept =       x25_accept,
1767         .getname =      x25_getname,
1768         .poll =         datagram_poll,
1769         .ioctl =        x25_ioctl,
1770 #ifdef CONFIG_COMPAT
1771         .compat_ioctl = compat_x25_ioctl,
1772 #endif
1773         .listen =       x25_listen,
1774         .shutdown =     sock_no_shutdown,
1775         .setsockopt =   x25_setsockopt,
1776         .getsockopt =   x25_getsockopt,
1777         .sendmsg =      x25_sendmsg,
1778         .recvmsg =      x25_recvmsg,
1779         .mmap =         sock_no_mmap,
1780         .sendpage =     sock_no_sendpage,
1781 };
1782
1783 static struct packet_type x25_packet_type __read_mostly = {
1784         .type = cpu_to_be16(ETH_P_X25),
1785         .func = x25_lapb_receive_frame,
1786 };
1787
1788 static struct notifier_block x25_dev_notifier = {
1789         .notifier_call = x25_device_event,
1790 };
1791
1792 void x25_kill_by_neigh(struct x25_neigh *nb)
1793 {
1794         struct sock *s;
1795
1796         write_lock_bh(&x25_list_lock);
1797
1798         sk_for_each(s, &x25_list) {
1799                 if (x25_sk(s)->neighbour == nb) {
1800                         write_unlock_bh(&x25_list_lock);
1801                         lock_sock(s);
1802                         x25_disconnect(s, ENETUNREACH, 0, 0);
1803                         release_sock(s);
1804                         write_lock_bh(&x25_list_lock);
1805                 }
1806         }
1807         write_unlock_bh(&x25_list_lock);
1808
1809         /* Remove any related forwards */
1810         x25_clear_forward_by_dev(nb->dev);
1811 }
1812
1813 static int __init x25_init(void)
1814 {
1815         int rc;
1816
1817         rc = proto_register(&x25_proto, 0);
1818         if (rc)
1819                 goto out;
1820
1821         rc = sock_register(&x25_family_ops);
1822         if (rc)
1823                 goto out_proto;
1824
1825         dev_add_pack(&x25_packet_type);
1826
1827         rc = register_netdevice_notifier(&x25_dev_notifier);
1828         if (rc)
1829                 goto out_sock;
1830
1831         rc = x25_register_sysctl();
1832         if (rc)
1833                 goto out_dev;
1834
1835         rc = x25_proc_init();
1836         if (rc)
1837                 goto out_sysctl;
1838
1839         pr_info("Linux Version 0.2\n");
1840
1841 out:
1842         return rc;
1843 out_sysctl:
1844         x25_unregister_sysctl();
1845 out_dev:
1846         unregister_netdevice_notifier(&x25_dev_notifier);
1847 out_sock:
1848         dev_remove_pack(&x25_packet_type);
1849         sock_unregister(AF_X25);
1850 out_proto:
1851         proto_unregister(&x25_proto);
1852         goto out;
1853 }
1854 module_init(x25_init);
1855
1856 static void __exit x25_exit(void)
1857 {
1858         x25_proc_exit();
1859         x25_link_free();
1860         x25_route_free();
1861
1862         x25_unregister_sysctl();
1863
1864         unregister_netdevice_notifier(&x25_dev_notifier);
1865
1866         dev_remove_pack(&x25_packet_type);
1867
1868         sock_unregister(AF_X25);
1869         proto_unregister(&x25_proto);
1870 }
1871 module_exit(x25_exit);
1872
1873 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1874 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1875 MODULE_LICENSE("GPL");
1876 MODULE_ALIAS_NETPROTO(PF_X25);