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(struct timer_list *t)
 376 {
 377         struct sock *sk = from_timer(sk, t, sk_timer);
 378
 379         x25_destroy_socket_from_timer(sk);
 380 }
 381
 382 /*
 383  *      This is called from user mode and the timers. Thus it protects itself
 384  *      against interrupt users but doesn't worry about being called during
 385  *      work. Once it is removed from the queue no interrupt or bottom half
 386  *      will touch it and we are (fairly 8-) ) safe.
 387  *      Not static as it's used by the timer
 388  */
 389 static void __x25_destroy_socket(struct sock *sk)
 390 {
 391         struct sk_buff *skb;
 392
 393         x25_stop_heartbeat(sk);
 394         x25_stop_timer(sk);
 395
 396         x25_remove_socket(sk);
 397         x25_clear_queues(sk);           /* Flush the queues */
 398
 399         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 400                 if (skb->sk != sk) {            /* A pending connection */
 401                         /*
 402                          * Queue the unaccepted socket for death
 403                          */
 404                         skb->sk->sk_state = TCP_LISTEN;
 405                         sock_set_flag(skb->sk, SOCK_DEAD);
 406                         x25_start_heartbeat(skb->sk);
 407                         x25_sk(skb->sk)->state = X25_STATE_0;
 408                 }
 409
 410                 kfree_skb(skb);
 411         }
 412
 413         if (sk_has_allocations(sk)) {
 414                 /* Defer: outstanding buffers */
 415                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 416                 sk->sk_timer.function = x25_destroy_timer;
 417                 add_timer(&sk->sk_timer);
 418         } else {
 419                 /* drop last reference so sock_put will free */
 420                 __sock_put(sk);
 421         }
 422 }
 423
 424 void x25_destroy_socket_from_timer(struct sock *sk)
 425 {
 426         sock_hold(sk);
 427         bh_lock_sock(sk);
 428         __x25_destroy_socket(sk);
 429         bh_unlock_sock(sk);
 430         sock_put(sk);
 431 }
 432
 433 /*
 434  *      Handling for system calls applied via the various interfaces to a
 435  *      X.25 socket object.
 436  */
 437
 438 static int x25_setsockopt(struct socket *sock, int level, int optname,
 439                           char __user *optval, unsigned int optlen)
 440 {
 441         int opt;
 442         struct sock *sk = sock->sk;
 443         int rc = -ENOPROTOOPT;
 444
 445         if (level != SOL_X25 || optname != X25_QBITINCL)
 446                 goto out;
 447
 448         rc = -EINVAL;
 449         if (optlen < sizeof(int))
 450                 goto out;
 451
 452         rc = -EFAULT;
 453         if (get_user(opt, (int __user *)optval))
 454                 goto out;
 455
 456         if (opt)
 457                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 458         else
 459                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 460         rc = 0;
 461 out:
 462         return rc;
 463 }
 464
 465 static int x25_getsockopt(struct socket *sock, int level, int optname,
 466                           char __user *optval, int __user *optlen)
 467 {
 468         struct sock *sk = sock->sk;
 469         int val, len, rc = -ENOPROTOOPT;
 470
 471         if (level != SOL_X25 || optname != X25_QBITINCL)
 472                 goto out;
 473
 474         rc = -EFAULT;
 475         if (get_user(len, optlen))
 476                 goto out;
 477
 478         len = min_t(unsigned int, len, sizeof(int));
 479
 480         rc = -EINVAL;
 481         if (len < 0)
 482                 goto out;
 483
 484         rc = -EFAULT;
 485         if (put_user(len, optlen))
 486                 goto out;
 487
 488         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 489         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 490 out:
 491         return rc;
 492 }
 493
 494 static int x25_listen(struct socket *sock, int backlog)
 495 {
 496         struct sock *sk = sock->sk;
 497         int rc = -EOPNOTSUPP;
 498
 499         lock_sock(sk);
 500         if (sk->sk_state != TCP_LISTEN) {
 501                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 502                 sk->sk_max_ack_backlog = backlog;
 503                 sk->sk_state           = TCP_LISTEN;
 504                 rc = 0;
 505         }
 506         release_sock(sk);
 507
 508         return rc;
 509 }
 510
 511 static struct proto x25_proto = {
 512         .name     = "X25",
 513         .owner    = THIS_MODULE,
 514         .obj_size = sizeof(struct x25_sock),
 515 };
 516
 517 static struct sock *x25_alloc_socket(struct net *net, int kern)
 518 {
 519         struct x25_sock *x25;
 520         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 521
 522         if (!sk)
 523                 goto out;
 524
 525         sock_init_data(NULL, sk);
 526
 527         x25 = x25_sk(sk);
 528         skb_queue_head_init(&x25->ack_queue);
 529         skb_queue_head_init(&x25->fragment_queue);
 530         skb_queue_head_init(&x25->interrupt_in_queue);
 531         skb_queue_head_init(&x25->interrupt_out_queue);
 532 out:
 533         return sk;
 534 }
 535
 536 static int x25_create(struct net *net, struct socket *sock, int protocol,
 537                       int kern)
 538 {
 539         struct sock *sk;
 540         struct x25_sock *x25;
 541         int rc = -EAFNOSUPPORT;
 542
 543         if (!net_eq(net, &init_net))
 544                 goto out;
 545
 546         rc = -ESOCKTNOSUPPORT;
 547         if (sock->type != SOCK_SEQPACKET)
 548                 goto out;
 549
 550         rc = -EINVAL;
 551         if (protocol)
 552                 goto out;
 553
 554         rc = -ENOMEM;
 555         if ((sk = x25_alloc_socket(net, kern)) == NULL)
 556                 goto out;
 557
 558         x25 = x25_sk(sk);
 559
 560         sock_init_data(sock, sk);
 561
 562         x25_init_timers(sk);
 563
 564         sock->ops    = &x25_proto_ops;
 565         sk->sk_protocol = protocol;
 566         sk->sk_backlog_rcv = x25_backlog_rcv;
 567
 568         x25->t21   = sysctl_x25_call_request_timeout;
 569         x25->t22   = sysctl_x25_reset_request_timeout;
 570         x25->t23   = sysctl_x25_clear_request_timeout;
 571         x25->t2    = sysctl_x25_ack_holdback_timeout;
 572         x25->state = X25_STATE_0;
 573         x25->cudmatchlength = 0;
 574         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 575                                                         /* on call accept   */
 576
 577         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 578         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 579         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 580         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 581         x25->facilities.throughput  = 0;        /* by default don't negotiate
 582                                                    throughput */
 583         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 584         x25->dte_facilities.calling_len = 0;
 585         x25->dte_facilities.called_len = 0;
 586         memset(x25->dte_facilities.called_ae, '\0',
 587                         sizeof(x25->dte_facilities.called_ae));
 588         memset(x25->dte_facilities.calling_ae, '\0',
 589                         sizeof(x25->dte_facilities.calling_ae));
 590
 591         rc = 0;
 592 out:
 593         return rc;
 594 }
 595
 596 static struct sock *x25_make_new(struct sock *osk)
 597 {
 598         struct sock *sk = NULL;
 599         struct x25_sock *x25, *ox25;
 600
 601         if (osk->sk_type != SOCK_SEQPACKET)
 602                 goto out;
 603
 604         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
 605                 goto out;
 606
 607         x25 = x25_sk(sk);
 608
 609         sk->sk_type        = osk->sk_type;
 610         sk->sk_priority    = osk->sk_priority;
 611         sk->sk_protocol    = osk->sk_protocol;
 612         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 613         sk->sk_sndbuf      = osk->sk_sndbuf;
 614         sk->sk_state       = TCP_ESTABLISHED;
 615         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 616         sock_copy_flags(sk, osk);
 617
 618         ox25 = x25_sk(osk);
 619         x25->t21        = ox25->t21;
 620         x25->t22        = ox25->t22;
 621         x25->t23        = ox25->t23;
 622         x25->t2         = ox25->t2;
 623         x25->flags      = ox25->flags;
 624         x25->facilities = ox25->facilities;
 625         x25->dte_facilities = ox25->dte_facilities;
 626         x25->cudmatchlength = ox25->cudmatchlength;
 627
 628         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 629         x25_init_timers(sk);
 630 out:
 631         return sk;
 632 }
 633
 634 static int x25_release(struct socket *sock)
 635 {
 636         struct sock *sk = sock->sk;
 637         struct x25_sock *x25;
 638
 639         if (!sk)
 640                 return 0;
 641
 642         x25 = x25_sk(sk);
 643
 644         sock_hold(sk);
 645         lock_sock(sk);
 646         switch (x25->state) {
 647
 648                 case X25_STATE_0:
 649                 case X25_STATE_2:
 650                         x25_disconnect(sk, 0, 0, 0);
 651                         __x25_destroy_socket(sk);
 652                         goto out;
 653
 654                 case X25_STATE_1:
 655                 case X25_STATE_3:
 656                 case X25_STATE_4:
 657                         x25_clear_queues(sk);
 658                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 659                         x25_start_t23timer(sk);
 660                         x25->state = X25_STATE_2;
 661                         sk->sk_state    = TCP_CLOSE;
 662                         sk->sk_shutdown |= SEND_SHUTDOWN;
 663                         sk->sk_state_change(sk);
 664                         sock_set_flag(sk, SOCK_DEAD);
 665                         sock_set_flag(sk, SOCK_DESTROY);
 666                         break;
 667         }
 668
 669         sock_orphan(sk);
 670 out:
 671         release_sock(sk);
 672         sock_put(sk);
 673         return 0;
 674 }
 675
 676 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 677 {
 678         struct sock *sk = sock->sk;
 679         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 680         int len, i, rc = 0;
 681
 682         if (addr_len != sizeof(struct sockaddr_x25) ||
 683             addr->sx25_family != AF_X25 ||
 684             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
 685                 rc = -EINVAL;
 686                 goto out;
 687         }
 688
 689         /* check for the null_x25_address */
 690         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
 691
 692                 len = strlen(addr->sx25_addr.x25_addr);
 693                 for (i = 0; i < len; i++) {
 694                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 695                                 rc = -EINVAL;
 696                                 goto out;
 697                         }
 698                 }
 699         }
 700
 701         lock_sock(sk);
 702         if (sock_flag(sk, SOCK_ZAPPED)) {
 703                 x25_sk(sk)->source_addr = addr->sx25_addr;
 704                 x25_insert_socket(sk);
 705                 sock_reset_flag(sk, SOCK_ZAPPED);
 706         } else {
 707                 rc = -EINVAL;
 708         }
 709         release_sock(sk);
 710         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 711 out:
 712         return rc;
 713 }
 714
 715 static int x25_wait_for_connection_establishment(struct sock *sk)
 716 {
 717         DECLARE_WAITQUEUE(wait, current);
 718         int rc;
 719
 720         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 721         for (;;) {
 722                 __set_current_state(TASK_INTERRUPTIBLE);
 723                 rc = -ERESTARTSYS;
 724                 if (signal_pending(current))
 725                         break;
 726                 rc = sock_error(sk);
 727                 if (rc) {
 728                         sk->sk_socket->state = SS_UNCONNECTED;
 729                         break;
 730                 }
 731                 rc = 0;
 732                 if (sk->sk_state != TCP_ESTABLISHED) {
 733                         release_sock(sk);
 734                         schedule();
 735                         lock_sock(sk);
 736                 } else
 737                         break;
 738         }
 739         __set_current_state(TASK_RUNNING);
 740         remove_wait_queue(sk_sleep(sk), &wait);
 741         return rc;
 742 }
 743
 744 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 745                        int addr_len, int flags)
 746 {
 747         struct sock *sk = sock->sk;
 748         struct x25_sock *x25 = x25_sk(sk);
 749         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 750         struct x25_route *rt;
 751         int rc = 0;
 752
 753         lock_sock(sk);
 754         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 755                 sock->state = SS_CONNECTED;
 756                 goto out; /* Connect completed during a ERESTARTSYS event */
 757         }
 758
 759         rc = -ECONNREFUSED;
 760         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 761                 sock->state = SS_UNCONNECTED;
 762                 goto out;
 763         }
 764
 765         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 766         if (sk->sk_state == TCP_ESTABLISHED)
 767                 goto out;
 768
 769         rc = -EALREADY; /* Do nothing if call is already in progress */
 770         if (sk->sk_state == TCP_SYN_SENT)
 771                 goto out;
 772
 773         sk->sk_state   = TCP_CLOSE;
 774         sock->state = SS_UNCONNECTED;
 775
 776         rc = -EINVAL;
 777         if (addr_len != sizeof(struct sockaddr_x25) ||
 778             addr->sx25_family != AF_X25 ||
 779             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
 780                 goto out;
 781
 782         rc = -ENETUNREACH;
 783         rt = x25_get_route(&addr->sx25_addr);
 784         if (!rt)
 785                 goto out;
 786
 787         x25->neighbour = x25_get_neigh(rt->dev);
 788         if (!x25->neighbour)
 789                 goto out_put_route;
 790
 791         x25_limit_facilities(&x25->facilities, x25->neighbour);
 792
 793         x25->lci = x25_new_lci(x25->neighbour);
 794         if (!x25->lci)
 795                 goto out_put_neigh;
 796
 797         rc = -EINVAL;
 798         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 799                 goto out_put_neigh;
 800
 801         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 802                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 803
 804         x25->dest_addr = addr->sx25_addr;
 805
 806         /* Move to connecting socket, start sending Connect Requests */
 807         sock->state   = SS_CONNECTING;
 808         sk->sk_state  = TCP_SYN_SENT;
 809
 810         x25->state = X25_STATE_1;
 811
 812         x25_write_internal(sk, X25_CALL_REQUEST);
 813
 814         x25_start_heartbeat(sk);
 815         x25_start_t21timer(sk);
 816
 817         /* Now the loop */
 818         rc = -EINPROGRESS;
 819         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 820                 goto out;
 821
 822         rc = x25_wait_for_connection_establishment(sk);
 823         if (rc)
 824                 goto out_put_neigh;
 825
 826         sock->state = SS_CONNECTED;
 827         rc = 0;
 828 out_put_neigh:
 829         if (rc && x25->neighbour) {
 830                 read_lock_bh(&x25_list_lock);
 831                 x25_neigh_put(x25->neighbour);
 832                 x25->neighbour = NULL;
 833                 read_unlock_bh(&x25_list_lock);
 834                 x25->state = X25_STATE_0;
 835         }
 836 out_put_route:
 837         x25_route_put(rt);
 838 out:
 839         release_sock(sk);
 840         return rc;
 841 }
 842
 843 static int x25_wait_for_data(struct sock *sk, long timeout)
 844 {
 845         DECLARE_WAITQUEUE(wait, current);
 846         int rc = 0;
 847
 848         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 849         for (;;) {
 850                 __set_current_state(TASK_INTERRUPTIBLE);
 851                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 852                         break;
 853                 rc = -ERESTARTSYS;
 854                 if (signal_pending(current))
 855                         break;
 856                 rc = -EAGAIN;
 857                 if (!timeout)
 858                         break;
 859                 rc = 0;
 860                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 861                         release_sock(sk);
 862                         timeout = schedule_timeout(timeout);
 863                         lock_sock(sk);
 864                 } else
 865                         break;
 866         }
 867         __set_current_state(TASK_RUNNING);
 868         remove_wait_queue(sk_sleep(sk), &wait);
 869         return rc;
 870 }
 871
 872 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 873                       bool kern)
 874 {
 875         struct sock *sk = sock->sk;
 876         struct sock *newsk;
 877         struct sk_buff *skb;
 878         int rc = -EINVAL;
 879
 880         if (!sk)
 881                 goto out;
 882
 883         rc = -EOPNOTSUPP;
 884         if (sk->sk_type != SOCK_SEQPACKET)
 885                 goto out;
 886
 887         lock_sock(sk);
 888         rc = -EINVAL;
 889         if (sk->sk_state != TCP_LISTEN)
 890                 goto out2;
 891
 892         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 893         if (rc)
 894                 goto out2;
 895         skb = skb_dequeue(&sk->sk_receive_queue);
 896         rc = -EINVAL;
 897         if (!skb->sk)
 898                 goto out2;
 899         newsk            = skb->sk;
 900         sock_graft(newsk, newsock);
 901
 902         /* Now attach up the new socket */
 903         skb->sk = NULL;
 904         kfree_skb(skb);
 905         sk->sk_ack_backlog--;
 906         newsock->state = SS_CONNECTED;
 907         rc = 0;
 908 out2:
 909         release_sock(sk);
 910 out:
 911         return rc;
 912 }
 913
 914 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 915                        int peer)
 916 {
 917         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 918         struct sock *sk = sock->sk;
 919         struct x25_sock *x25 = x25_sk(sk);
 920         int rc = 0;
 921
 922         if (peer) {
 923                 if (sk->sk_state != TCP_ESTABLISHED) {
 924                         rc = -ENOTCONN;
 925                         goto out;
 926                 }
 927                 sx25->sx25_addr = x25->dest_addr;
 928         } else
 929                 sx25->sx25_addr = x25->source_addr;
 930
 931         sx25->sx25_family = AF_X25;
 932         rc = sizeof(*sx25);
 933
 934 out:
 935         return rc;
 936 }
 937
 938 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 939                         unsigned int lci)
 940 {
 941         struct sock *sk;
 942         struct sock *make;
 943         struct x25_sock *makex25;
 944         struct x25_address source_addr, dest_addr;
 945         struct x25_facilities facilities;
 946         struct x25_dte_facilities dte_facilities;
 947         int len, addr_len, rc;
 948
 949         /*
 950          *      Remove the LCI and frame type.
 951          */
 952         skb_pull(skb, X25_STD_MIN_LEN);
 953
 954         /*
 955          *      Extract the X.25 addresses and convert them to ASCII strings,
 956          *      and remove them.
 957          *
 958          *      Address block is mandatory in call request packets
 959          */
 960         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 961         if (addr_len <= 0)
 962                 goto out_clear_request;
 963         skb_pull(skb, addr_len);
 964
 965         /*
 966          *      Get the length of the facilities, skip past them for the moment
 967          *      get the call user data because this is needed to determine
 968          *      the correct listener
 969          *
 970          *      Facilities length is mandatory in call request packets
 971          */
 972         if (!pskb_may_pull(skb, 1))
 973                 goto out_clear_request;
 974         len = skb->data[0] + 1;
 975         if (!pskb_may_pull(skb, len))
 976                 goto out_clear_request;
 977         skb_pull(skb,len);
 978
 979         /*
 980          *      Ensure that the amount of call user data is valid.
 981          */
 982         if (skb->len > X25_MAX_CUD_LEN)
 983                 goto out_clear_request;
 984
 985         /*
 986          *      Get all the call user data so it can be used in
 987          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 988          */
 989         if (!pskb_may_pull(skb, skb->len))
 990                 goto out_clear_request;
 991
 992         /*
 993          *      Find a listener for the particular address/cud pair.
 994          */
 995         sk = x25_find_listener(&source_addr,skb);
 996         skb_push(skb,len);
 997
 998         if (sk != NULL && sk_acceptq_is_full(sk)) {
 999                 goto out_sock_put;
1000         }
1001
1002         /*
1003          *      We dont have any listeners for this incoming call.
1004          *      Try forwarding it.
1005          */
1006         if (sk == NULL) {
1007                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1008                 if (sysctl_x25_forward &&
1009                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1010                 {
1011                         /* Call was forwarded, dont process it any more */
1012                         kfree_skb(skb);
1013                         rc = 1;
1014                         goto out;
1015                 } else {
1016                         /* No listeners, can't forward, clear the call */
1017                         goto out_clear_request;
1018                 }
1019         }
1020
1021         /*
1022          *      Try to reach a compromise on the requested facilities.
1023          */
1024         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1025         if (len == -1)
1026                 goto out_sock_put;
1027
1028         /*
1029          * current neighbour/link might impose additional limits
1030          * on certain facilties
1031          */
1032
1033         x25_limit_facilities(&facilities, nb);
1034
1035         /*
1036          *      Try to create a new socket.
1037          */
1038         make = x25_make_new(sk);
1039         if (!make)
1040                 goto out_sock_put;
1041
1042         /*
1043          *      Remove the facilities
1044          */
1045         skb_pull(skb, len);
1046
1047         skb->sk     = make;
1048         make->sk_state = TCP_ESTABLISHED;
1049
1050         makex25 = x25_sk(make);
1051         makex25->lci           = lci;
1052         makex25->dest_addr     = dest_addr;
1053         makex25->source_addr   = source_addr;
1054         x25_neigh_hold(nb);
1055         makex25->neighbour     = nb;
1056         makex25->facilities    = facilities;
1057         makex25->dte_facilities= dte_facilities;
1058         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1059         /* ensure no reverse facil on accept */
1060         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1061         /* ensure no calling address extension on accept */
1062         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1063         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1064
1065         /* Normally all calls are accepted immediately */
1066         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1067                 x25_write_internal(make, X25_CALL_ACCEPTED);
1068                 makex25->state = X25_STATE_3;
1069         }
1070
1071         /*
1072          *      Incoming Call User Data.
1073          */
1074         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1075         makex25->calluserdata.cudlength = skb->len;
1076
1077         sk->sk_ack_backlog++;
1078
1079         x25_insert_socket(make);
1080
1081         skb_queue_head(&sk->sk_receive_queue, skb);
1082
1083         x25_start_heartbeat(make);
1084
1085         if (!sock_flag(sk, SOCK_DEAD))
1086                 sk->sk_data_ready(sk);
1087         rc = 1;
1088         sock_put(sk);
1089 out:
1090         return rc;
1091 out_sock_put:
1092         sock_put(sk);
1093 out_clear_request:
1094         rc = 0;
1095         x25_transmit_clear_request(nb, lci, 0x01);
1096         goto out;
1097 }
1098
1099 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1100 {
1101         struct sock *sk = sock->sk;
1102         struct x25_sock *x25 = x25_sk(sk);
1103         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1104         struct sockaddr_x25 sx25;
1105         struct sk_buff *skb;
1106         unsigned char *asmptr;
1107         int noblock = msg->msg_flags & MSG_DONTWAIT;
1108         size_t size;
1109         int qbit = 0, rc = -EINVAL;
1110
1111         lock_sock(sk);
1112         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1113                 goto out;
1114
1115         /* we currently don't support segmented records at the user interface */
1116         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1117                 goto out;
1118
1119         rc = -EADDRNOTAVAIL;
1120         if (sock_flag(sk, SOCK_ZAPPED))
1121                 goto out;
1122
1123         rc = -EPIPE;
1124         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1125                 send_sig(SIGPIPE, current, 0);
1126                 goto out;
1127         }
1128
1129         rc = -ENETUNREACH;
1130         if (!x25->neighbour)
1131                 goto out;
1132
1133         if (usx25) {
1134                 rc = -EINVAL;
1135                 if (msg->msg_namelen < sizeof(sx25))
1136                         goto out;
1137                 memcpy(&sx25, usx25, sizeof(sx25));
1138                 rc = -EISCONN;
1139                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1140                         goto out;
1141                 rc = -EINVAL;
1142                 if (sx25.sx25_family != AF_X25)
1143                         goto out;
1144         } else {
1145                 /*
1146                  *      FIXME 1003.1g - if the socket is like this because
1147                  *      it has become closed (not started closed) we ought
1148                  *      to SIGPIPE, EPIPE;
1149                  */
1150                 rc = -ENOTCONN;
1151                 if (sk->sk_state != TCP_ESTABLISHED)
1152                         goto out;
1153
1154                 sx25.sx25_family = AF_X25;
1155                 sx25.sx25_addr   = x25->dest_addr;
1156         }
1157
1158         /* Sanity check the packet size */
1159         if (len > 65535) {
1160                 rc = -EMSGSIZE;
1161                 goto out;
1162         }
1163
1164         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1165
1166         /* Build a packet */
1167         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1168
1169         if ((msg->msg_flags & MSG_OOB) && len > 32)
1170                 len = 32;
1171
1172         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1173
1174         release_sock(sk);
1175         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1176         lock_sock(sk);
1177         if (!skb)
1178                 goto out;
1179         X25_SKB_CB(skb)->flags = msg->msg_flags;
1180
1181         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1182
1183         /*
1184          *      Put the data on the end
1185          */
1186         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1187
1188         skb_reset_transport_header(skb);
1189         skb_put(skb, len);
1190
1191         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1192         if (rc)
1193                 goto out_kfree_skb;
1194
1195         /*
1196          *      If the Q BIT Include socket option is in force, the first
1197          *      byte of the user data is the logical value of the Q Bit.
1198          */
1199         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1200                 if (!pskb_may_pull(skb, 1))
1201                         goto out_kfree_skb;
1202
1203                 qbit = skb->data[0];
1204                 skb_pull(skb, 1);
1205         }
1206
1207         /*
1208          *      Push down the X.25 header
1209          */
1210         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1211
1212         if (msg->msg_flags & MSG_OOB) {
1213                 if (x25->neighbour->extended) {
1214                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1215                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1216                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1217                         *asmptr++ = X25_INTERRUPT;
1218                 } else {
1219                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1220                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1221                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1222                         *asmptr++ = X25_INTERRUPT;
1223                 }
1224         } else {
1225                 if (x25->neighbour->extended) {
1226                         /* Build an Extended X.25 header */
1227                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1228                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1229                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1230                         *asmptr++ = X25_DATA;
1231                         *asmptr++ = X25_DATA;
1232                 } else {
1233                         /* Build an Standard X.25 header */
1234                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1235                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1236                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1237                         *asmptr++ = X25_DATA;
1238                 }
1239
1240                 if (qbit)
1241                         skb->data[0] |= X25_Q_BIT;
1242         }
1243
1244         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1245         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1246
1247         rc = -ENOTCONN;
1248         if (sk->sk_state != TCP_ESTABLISHED)
1249                 goto out_kfree_skb;
1250
1251         if (msg->msg_flags & MSG_OOB)
1252                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1253         else {
1254                 rc = x25_output(sk, skb);
1255                 len = rc;
1256                 if (rc < 0)
1257                         kfree_skb(skb);
1258                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1259                         len++;
1260         }
1261
1262         x25_kick(sk);
1263         rc = len;
1264 out:
1265         release_sock(sk);
1266         return rc;
1267 out_kfree_skb:
1268         kfree_skb(skb);
1269         goto out;
1270 }
1271
1272
1273 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1274                        int flags)
1275 {
1276         struct sock *sk = sock->sk;
1277         struct x25_sock *x25 = x25_sk(sk);
1278         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1279         size_t copied;
1280         int qbit, header_len;
1281         struct sk_buff *skb;
1282         unsigned char *asmptr;
1283         int rc = -ENOTCONN;
1284
1285         lock_sock(sk);
1286
1287         if (x25->neighbour == NULL)
1288                 goto out;
1289
1290         header_len = x25->neighbour->extended ?
1291                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1292
1293         /*
1294          * This works for seqpacket too. The receiver has ordered the queue for
1295          * us! We do one quick check first though
1296          */
1297         if (sk->sk_state != TCP_ESTABLISHED)
1298                 goto out;
1299
1300         if (flags & MSG_OOB) {
1301                 rc = -EINVAL;
1302                 if (sock_flag(sk, SOCK_URGINLINE) ||
1303                     !skb_peek(&x25->interrupt_in_queue))
1304                         goto out;
1305
1306                 skb = skb_dequeue(&x25->interrupt_in_queue);
1307
1308                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1309                         goto out_free_dgram;
1310
1311                 skb_pull(skb, X25_STD_MIN_LEN);
1312
1313                 /*
1314                  *      No Q bit information on Interrupt data.
1315                  */
1316                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1317                         asmptr  = skb_push(skb, 1);
1318                         *asmptr = 0x00;
1319                 }
1320
1321                 msg->msg_flags |= MSG_OOB;
1322         } else {
1323                 /* Now we can treat all alike */
1324                 release_sock(sk);
1325                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1326                                         flags & MSG_DONTWAIT, &rc);
1327                 lock_sock(sk);
1328                 if (!skb)
1329                         goto out;
1330
1331                 if (!pskb_may_pull(skb, header_len))
1332                         goto out_free_dgram;
1333
1334                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1335
1336                 skb_pull(skb, header_len);
1337
1338                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1339                         asmptr  = skb_push(skb, 1);
1340                         *asmptr = qbit;
1341                 }
1342         }
1343
1344         skb_reset_transport_header(skb);
1345         copied = skb->len;
1346
1347         if (copied > size) {
1348                 copied = size;
1349                 msg->msg_flags |= MSG_TRUNC;
1350         }
1351
1352         /* Currently, each datagram always contains a complete record */
1353         msg->msg_flags |= MSG_EOR;
1354
1355         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1356         if (rc)
1357                 goto out_free_dgram;
1358
1359         if (sx25) {
1360                 sx25->sx25_family = AF_X25;
1361                 sx25->sx25_addr   = x25->dest_addr;
1362                 msg->msg_namelen = sizeof(*sx25);
1363         }
1364
1365         x25_check_rbuf(sk);
1366         rc = copied;
1367 out_free_dgram:
1368         skb_free_datagram(sk, skb);
1369 out:
1370         release_sock(sk);
1371         return rc;
1372 }
1373
1374
1375 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1376 {
1377         struct sock *sk = sock->sk;
1378         struct x25_sock *x25 = x25_sk(sk);
1379         void __user *argp = (void __user *)arg;
1380         int rc;
1381
1382         switch (cmd) {
1383         case TIOCOUTQ: {
1384                 int amount;
1385
1386                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1387                 if (amount < 0)
1388                         amount = 0;
1389                 rc = put_user(amount, (unsigned int __user *)argp);
1390                 break;
1391         }
1392
1393         case TIOCINQ: {
1394                 struct sk_buff *skb;
1395                 int amount = 0;
1396                 /*
1397                  * These two are safe on a single CPU system as
1398                  * only user tasks fiddle here
1399                  */
1400                 lock_sock(sk);
1401                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1402                         amount = skb->len;
1403                 release_sock(sk);
1404                 rc = put_user(amount, (unsigned int __user *)argp);
1405                 break;
1406         }
1407
1408         case SIOCGSTAMP:
1409                 rc = -EINVAL;
1410                 if (sk)
1411                         rc = sock_get_timestamp(sk,
1412                                                 (struct timeval __user *)argp);
1413                 break;
1414         case SIOCGSTAMPNS:
1415                 rc = -EINVAL;
1416                 if (sk)
1417                         rc = sock_get_timestampns(sk,
1418                                         (struct timespec __user *)argp);
1419                 break;
1420         case SIOCGIFADDR:
1421         case SIOCSIFADDR:
1422         case SIOCGIFDSTADDR:
1423         case SIOCSIFDSTADDR:
1424         case SIOCGIFBRDADDR:
1425         case SIOCSIFBRDADDR:
1426         case SIOCGIFNETMASK:
1427         case SIOCSIFNETMASK:
1428         case SIOCGIFMETRIC:
1429         case SIOCSIFMETRIC:
1430                 rc = -EINVAL;
1431                 break;
1432         case SIOCADDRT:
1433         case SIOCDELRT:
1434                 rc = -EPERM;
1435                 if (!capable(CAP_NET_ADMIN))
1436                         break;
1437                 rc = x25_route_ioctl(cmd, argp);
1438                 break;
1439         case SIOCX25GSUBSCRIP:
1440                 rc = x25_subscr_ioctl(cmd, argp);
1441                 break;
1442         case SIOCX25SSUBSCRIP:
1443                 rc = -EPERM;
1444                 if (!capable(CAP_NET_ADMIN))
1445                         break;
1446                 rc = x25_subscr_ioctl(cmd, argp);
1447                 break;
1448         case SIOCX25GFACILITIES: {
1449                 lock_sock(sk);
1450                 rc = copy_to_user(argp, &x25->facilities,
1451                                   sizeof(x25->facilities))
1452                         ? -EFAULT : 0;
1453                 release_sock(sk);
1454                 break;
1455         }
1456
1457         case SIOCX25SFACILITIES: {
1458                 struct x25_facilities facilities;
1459                 rc = -EFAULT;
1460                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1461                         break;
1462                 rc = -EINVAL;
1463                 lock_sock(sk);
1464                 if (sk->sk_state != TCP_LISTEN &&
1465                     sk->sk_state != TCP_CLOSE)
1466                         goto out_fac_release;
1467                 if (facilities.pacsize_in < X25_PS16 ||
1468                     facilities.pacsize_in > X25_PS4096)
1469                         goto out_fac_release;
1470                 if (facilities.pacsize_out < X25_PS16 ||
1471                     facilities.pacsize_out > X25_PS4096)
1472                         goto out_fac_release;
1473                 if (facilities.winsize_in < 1 ||
1474                     facilities.winsize_in > 127)
1475                         goto out_fac_release;
1476                 if (facilities.throughput) {
1477                         int out = facilities.throughput & 0xf0;
1478                         int in  = facilities.throughput & 0x0f;
1479                         if (!out)
1480                                 facilities.throughput |=
1481                                         X25_DEFAULT_THROUGHPUT << 4;
1482                         else if (out < 0x30 || out > 0xD0)
1483                                 goto out_fac_release;
1484                         if (!in)
1485                                 facilities.throughput |=
1486                                         X25_DEFAULT_THROUGHPUT;
1487                         else if (in < 0x03 || in > 0x0D)
1488                                 goto out_fac_release;
1489                 }
1490                 if (facilities.reverse &&
1491                     (facilities.reverse & 0x81) != 0x81)
1492                         goto out_fac_release;
1493                 x25->facilities = facilities;
1494                 rc = 0;
1495 out_fac_release:
1496                 release_sock(sk);
1497                 break;
1498         }
1499
1500         case SIOCX25GDTEFACILITIES: {
1501                 lock_sock(sk);
1502                 rc = copy_to_user(argp, &x25->dte_facilities,
1503                                   sizeof(x25->dte_facilities));
1504                 release_sock(sk);
1505                 if (rc)
1506                         rc = -EFAULT;
1507                 break;
1508         }
1509
1510         case SIOCX25SDTEFACILITIES: {
1511                 struct x25_dte_facilities dtefacs;
1512                 rc = -EFAULT;
1513                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1514                         break;
1515                 rc = -EINVAL;
1516                 lock_sock(sk);
1517                 if (sk->sk_state != TCP_LISTEN &&
1518                     sk->sk_state != TCP_CLOSE)
1519                         goto out_dtefac_release;
1520                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1521                         goto out_dtefac_release;
1522                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1523                         goto out_dtefac_release;
1524                 x25->dte_facilities = dtefacs;
1525                 rc = 0;
1526 out_dtefac_release:
1527                 release_sock(sk);
1528                 break;
1529         }
1530
1531         case SIOCX25GCALLUSERDATA: {
1532                 lock_sock(sk);
1533                 rc = copy_to_user(argp, &x25->calluserdata,
1534                                   sizeof(x25->calluserdata))
1535                         ? -EFAULT : 0;
1536                 release_sock(sk);
1537                 break;
1538         }
1539
1540         case SIOCX25SCALLUSERDATA: {
1541                 struct x25_calluserdata calluserdata;
1542
1543                 rc = -EFAULT;
1544                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1545                         break;
1546                 rc = -EINVAL;
1547                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1548                         break;
1549                 lock_sock(sk);
1550                 x25->calluserdata = calluserdata;
1551                 release_sock(sk);
1552                 rc = 0;
1553                 break;
1554         }
1555
1556         case SIOCX25GCAUSEDIAG: {
1557                 lock_sock(sk);
1558                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1559                         ? -EFAULT : 0;
1560                 release_sock(sk);
1561                 break;
1562         }
1563
1564         case SIOCX25SCAUSEDIAG: {
1565                 struct x25_causediag causediag;
1566                 rc = -EFAULT;
1567                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1568                         break;
1569                 lock_sock(sk);
1570                 x25->causediag = causediag;
1571                 release_sock(sk);
1572                 rc = 0;
1573                 break;
1574
1575         }
1576
1577         case SIOCX25SCUDMATCHLEN: {
1578                 struct x25_subaddr sub_addr;
1579                 rc = -EINVAL;
1580                 lock_sock(sk);
1581                 if(sk->sk_state != TCP_CLOSE)
1582                         goto out_cud_release;
1583                 rc = -EFAULT;
1584                 if (copy_from_user(&sub_addr, argp,
1585                                    sizeof(sub_addr)))
1586                         goto out_cud_release;
1587                 rc = -EINVAL;
1588                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1589                         goto out_cud_release;
1590                 x25->cudmatchlength = sub_addr.cudmatchlength;
1591                 rc = 0;
1592 out_cud_release:
1593                 release_sock(sk);
1594                 break;
1595         }
1596
1597         case SIOCX25CALLACCPTAPPRV: {
1598                 rc = -EINVAL;
1599                 lock_sock(sk);
1600                 if (sk->sk_state == TCP_CLOSE) {
1601                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1602                         rc = 0;
1603                 }
1604                 release_sock(sk);
1605                 break;
1606         }
1607
1608         case SIOCX25SENDCALLACCPT:  {
1609                 rc = -EINVAL;
1610                 lock_sock(sk);
1611                 if (sk->sk_state != TCP_ESTABLISHED)
1612                         goto out_sendcallaccpt_release;
1613                 /* must call accptapprv above */
1614                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1615                         goto out_sendcallaccpt_release;
1616                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1617                 x25->state = X25_STATE_3;
1618                 rc = 0;
1619 out_sendcallaccpt_release:
1620                 release_sock(sk);
1621                 break;
1622         }
1623
1624         default:
1625                 rc = -ENOIOCTLCMD;
1626                 break;
1627         }
1628
1629         return rc;
1630 }
1631
1632 static const struct net_proto_family x25_family_ops = {
1633         .family =       AF_X25,
1634         .create =       x25_create,
1635         .owner  =       THIS_MODULE,
1636 };
1637
1638 #ifdef CONFIG_COMPAT
1639 static int compat_x25_subscr_ioctl(unsigned int cmd,
1640                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1641 {
1642         struct compat_x25_subscrip_struct x25_subscr;
1643         struct x25_neigh *nb;
1644         struct net_device *dev;
1645         int rc = -EINVAL;
1646
1647         rc = -EFAULT;
1648         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1649                 goto out;
1650
1651         rc = -EINVAL;
1652         dev = x25_dev_get(x25_subscr.device);
1653         if (dev == NULL)
1654                 goto out;
1655
1656         nb = x25_get_neigh(dev);
1657         if (nb == NULL)
1658                 goto out_dev_put;
1659
1660         dev_put(dev);
1661
1662         if (cmd == SIOCX25GSUBSCRIP) {
1663                 read_lock_bh(&x25_neigh_list_lock);
1664                 x25_subscr.extended = nb->extended;
1665                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1666                 read_unlock_bh(&x25_neigh_list_lock);
1667                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1668                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1669         } else {
1670                 rc = -EINVAL;
1671                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1672                         rc = 0;
1673                         write_lock_bh(&x25_neigh_list_lock);
1674                         nb->extended = x25_subscr.extended;
1675                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1676                         write_unlock_bh(&x25_neigh_list_lock);
1677                 }
1678         }
1679         x25_neigh_put(nb);
1680 out:
1681         return rc;
1682 out_dev_put:
1683         dev_put(dev);
1684         goto out;
1685 }
1686
1687 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1688                                 unsigned long arg)
1689 {
1690         void __user *argp = compat_ptr(arg);
1691         struct sock *sk = sock->sk;
1692
1693         int rc = -ENOIOCTLCMD;
1694
1695         switch(cmd) {
1696         case TIOCOUTQ:
1697         case TIOCINQ:
1698                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1699                 break;
1700         case SIOCGSTAMP:
1701                 rc = -EINVAL;
1702                 if (sk)
1703                         rc = compat_sock_get_timestamp(sk,
1704                                         (struct timeval __user*)argp);
1705                 break;
1706         case SIOCGSTAMPNS:
1707                 rc = -EINVAL;
1708                 if (sk)
1709                         rc = compat_sock_get_timestampns(sk,
1710                                         (struct timespec __user*)argp);
1711                 break;
1712         case SIOCGIFADDR:
1713         case SIOCSIFADDR:
1714         case SIOCGIFDSTADDR:
1715         case SIOCSIFDSTADDR:
1716         case SIOCGIFBRDADDR:
1717         case SIOCSIFBRDADDR:
1718         case SIOCGIFNETMASK:
1719         case SIOCSIFNETMASK:
1720         case SIOCGIFMETRIC:
1721         case SIOCSIFMETRIC:
1722                 rc = -EINVAL;
1723                 break;
1724         case SIOCADDRT:
1725         case SIOCDELRT:
1726                 rc = -EPERM;
1727                 if (!capable(CAP_NET_ADMIN))
1728                         break;
1729                 rc = x25_route_ioctl(cmd, argp);
1730                 break;
1731         case SIOCX25GSUBSCRIP:
1732                 rc = compat_x25_subscr_ioctl(cmd, argp);
1733                 break;
1734         case SIOCX25SSUBSCRIP:
1735                 rc = -EPERM;
1736                 if (!capable(CAP_NET_ADMIN))
1737                         break;
1738                 rc = compat_x25_subscr_ioctl(cmd, argp);
1739                 break;
1740         case SIOCX25GFACILITIES:
1741         case SIOCX25SFACILITIES:
1742         case SIOCX25GDTEFACILITIES:
1743         case SIOCX25SDTEFACILITIES:
1744         case SIOCX25GCALLUSERDATA:
1745         case SIOCX25SCALLUSERDATA:
1746         case SIOCX25GCAUSEDIAG:
1747         case SIOCX25SCAUSEDIAG:
1748         case SIOCX25SCUDMATCHLEN:
1749         case SIOCX25CALLACCPTAPPRV:
1750         case SIOCX25SENDCALLACCPT:
1751                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1752                 break;
1753         default:
1754                 rc = -ENOIOCTLCMD;
1755                 break;
1756         }
1757         return rc;
1758 }
1759 #endif
1760
1761 static const struct proto_ops x25_proto_ops = {
1762         .family =       AF_X25,
1763         .owner =        THIS_MODULE,
1764         .release =      x25_release,
1765         .bind =         x25_bind,
1766         .connect =      x25_connect,
1767         .socketpair =   sock_no_socketpair,
1768         .accept =       x25_accept,
1769         .getname =      x25_getname,
1770         .poll =         datagram_poll,
1771         .ioctl =        x25_ioctl,
1772 #ifdef CONFIG_COMPAT
1773         .compat_ioctl = compat_x25_ioctl,
1774 #endif
1775         .listen =       x25_listen,
1776         .shutdown =     sock_no_shutdown,
1777         .setsockopt =   x25_setsockopt,
1778         .getsockopt =   x25_getsockopt,
1779         .sendmsg =      x25_sendmsg,
1780         .recvmsg =      x25_recvmsg,
1781         .mmap =         sock_no_mmap,
1782         .sendpage =     sock_no_sendpage,
1783 };
1784
1785 static struct packet_type x25_packet_type __read_mostly = {
1786         .type = cpu_to_be16(ETH_P_X25),
1787         .func = x25_lapb_receive_frame,
1788 };
1789
1790 static struct notifier_block x25_dev_notifier = {
1791         .notifier_call = x25_device_event,
1792 };
1793
1794 void x25_kill_by_neigh(struct x25_neigh *nb)
1795 {
1796         struct sock *s;
1797
1798         write_lock_bh(&x25_list_lock);
1799
1800         sk_for_each(s, &x25_list)
1801                 if (x25_sk(s)->neighbour == nb)
1802                         x25_disconnect(s, ENETUNREACH, 0, 0);
1803
1804         write_unlock_bh(&x25_list_lock);
1805
1806         /* Remove any related forwards */
1807         x25_clear_forward_by_dev(nb->dev);
1808 }
1809
1810 static int __init x25_init(void)
1811 {
1812         int rc;
1813
1814         rc = proto_register(&x25_proto, 0);
1815         if (rc)
1816                 goto out;
1817
1818         rc = sock_register(&x25_family_ops);
1819         if (rc)
1820                 goto out_proto;
1821
1822         dev_add_pack(&x25_packet_type);
1823
1824         rc = register_netdevice_notifier(&x25_dev_notifier);
1825         if (rc)
1826                 goto out_sock;
1827
1828         rc = x25_register_sysctl();
1829         if (rc)
1830                 goto out_dev;
1831
1832         rc = x25_proc_init();
1833         if (rc)
1834                 goto out_sysctl;
1835
1836         pr_info("Linux Version 0.2\n");
1837
1838 out:
1839         return rc;
1840 out_sysctl:
1841         x25_unregister_sysctl();
1842 out_dev:
1843         unregister_netdevice_notifier(&x25_dev_notifier);
1844 out_sock:
1845         dev_remove_pack(&x25_packet_type);
1846         sock_unregister(AF_X25);
1847 out_proto:
1848         proto_unregister(&x25_proto);
1849         goto out;
1850 }
1851 module_init(x25_init);
1852
1853 static void __exit x25_exit(void)
1854 {
1855         x25_proc_exit();
1856         x25_link_free();
1857         x25_route_free();
1858
1859         x25_unregister_sysctl();
1860
1861         unregister_netdevice_notifier(&x25_dev_notifier);
1862
1863         dev_remove_pack(&x25_packet_type);
1864
1865         sock_unregister(AF_X25);
1866         proto_unregister(&x25_proto);
1867 }
1868 module_exit(x25_exit);
1869
1870 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1871 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1872 MODULE_LICENSE("GPL");
1873 MODULE_ALIAS_NETPROTO(PF_X25);