net/x25/af_x25.c

   1 /*
   2  *      X.25 Packet Layer release 002
   3  *
   4  *      This is ALPHA test software. This code may break your machine,
   5  *      randomly fail to work with new releases, misbehave and/or generally
   6  *      screw up. It might even work.
   7  *
   8  *      This code REQUIRES 2.1.15 or higher
   9  *
  10  *      This module:
  11  *              This module is free software; you can redistribute it and/or
  12  *              modify it under the terms of the GNU General Public License
  13  *              as published by the Free Software Foundation; either version
  14  *              2 of the License, or (at your option) any later version.
  15  *
  16  *      History
  17  *      X.25 001        Jonathan Naylor Started coding.
  18  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19  *                                      New timer architecture.
  20  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22  *                                        facilities negotiation and increased
  23  *                                        the throughput upper limit.
  24  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26  *                                      Fixed x25_output() related skb leakage.
  27  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31  *                                      x25_proc.c, using seq_file
  32  *      2005-04-02      Shaun Pereira   Selective sub address matching
  33  *                                      with call user data
  34  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35  *                                      response
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/capability.h>
  40 #include <linux/errno.h>
  41 #include <linux/kernel.h>
  42 #include <linux/sched.h>
  43 #include <linux/timer.h>
  44 #include <linux/string.h>
  45 #include <linux/net.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/if_arp.h>
  48 #include <linux/skbuff.h>
  49 #include <linux/slab.h>
  50 #include <net/sock.h>
  51 #include <net/tcp_states.h>
  52 #include <asm/uaccess.h>
  53 #include <linux/fcntl.h>
  54 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  55 #include <linux/notifier.h>
  56 #include <linux/init.h>
  57 #include <linux/compat.h>
  58 #include <linux/ctype.h>
  59
  60 #include <net/x25.h>
  61 #include <net/compat.h>
  62
  63 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  64 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  65 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  66 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  67 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  68 int sysctl_x25_forward                 = 0;
  69
  70 HLIST_HEAD(x25_list);
  71 DEFINE_RWLOCK(x25_list_lock);
  72
  73 static const struct proto_ops x25_proto_ops;
  74
  75 static struct x25_address null_x25_address = {"               "};
  76
  77 #ifdef CONFIG_COMPAT
  78 struct compat_x25_subscrip_struct {
  79         char device[200-sizeof(compat_ulong_t)];
  80         compat_ulong_t global_facil_mask;
  81         compat_uint_t extended;
  82 };
  83 #endif
  84
  85
  86 int x25_parse_address_block(struct sk_buff *skb,
  87                 struct x25_address *called_addr,
  88                 struct x25_address *calling_addr)
  89 {
  90         unsigned char len;
  91         int needed;
  92         int rc;
  93
  94         if (skb->len < 1) {
  95                 /* packet has no address block */
  96                 rc = 0;
  97                 goto empty;
  98         }
  99
 100         len = *skb->data;
 101         needed = 1 + (len >> 4) + (len & 0x0f);
 102
 103         if (skb->len < needed) {
 104                 /* packet is too short to hold the addresses it claims
 105                    to hold */
 106                 rc = -1;
 107                 goto empty;
 108         }
 109
 110         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 111
 112 empty:
 113         *called_addr->x25_addr = 0;
 114         *calling_addr->x25_addr = 0;
 115
 116         return rc;
 117 }
 118
 119
 120 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 121                   struct x25_address *calling_addr)
 122 {
 123         unsigned int called_len, calling_len;
 124         char *called, *calling;
 125         unsigned int i;
 126
 127         called_len  = (*p >> 0) & 0x0F;
 128         calling_len = (*p >> 4) & 0x0F;
 129
 130         called  = called_addr->x25_addr;
 131         calling = calling_addr->x25_addr;
 132         p++;
 133
 134         for (i = 0; i < (called_len + calling_len); i++) {
 135                 if (i < called_len) {
 136                         if (i % 2 != 0) {
 137                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 138                                 p++;
 139                         } else {
 140                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 141                         }
 142                 } else {
 143                         if (i % 2 != 0) {
 144                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 145                                 p++;
 146                         } else {
 147                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 148                         }
 149                 }
 150         }
 151
 152         *called = *calling = '\0';
 153
 154         return 1 + (called_len + calling_len + 1) / 2;
 155 }
 156
 157 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 158                   struct x25_address *calling_addr)
 159 {
 160         unsigned int called_len, calling_len;
 161         char *called, *calling;
 162         int i;
 163
 164         called  = called_addr->x25_addr;
 165         calling = calling_addr->x25_addr;
 166
 167         called_len  = strlen(called);
 168         calling_len = strlen(calling);
 169
 170         *p++ = (calling_len << 4) | (called_len << 0);
 171
 172         for (i = 0; i < (called_len + calling_len); i++) {
 173                 if (i < called_len) {
 174                         if (i % 2 != 0) {
 175                                 *p |= (*called++ - '0') << 0;
 176                                 p++;
 177                         } else {
 178                                 *p = 0x00;
 179                                 *p |= (*called++ - '0') << 4;
 180                         }
 181                 } else {
 182                         if (i % 2 != 0) {
 183                                 *p |= (*calling++ - '0') << 0;
 184                                 p++;
 185                         } else {
 186                                 *p = 0x00;
 187                                 *p |= (*calling++ - '0') << 4;
 188                         }
 189                 }
 190         }
 191
 192         return 1 + (called_len + calling_len + 1) / 2;
 193 }
 194
 195 /*
 196  *      Socket removal during an interrupt is now safe.
 197  */
 198 static void x25_remove_socket(struct sock *sk)
 199 {
 200         write_lock_bh(&x25_list_lock);
 201         sk_del_node_init(sk);
 202         write_unlock_bh(&x25_list_lock);
 203 }
 204
 205 /*
 206  *      Kill all bound sockets on a dropped device.
 207  */
 208 static void x25_kill_by_device(struct net_device *dev)
 209 {
 210         struct sock *s;
 211         struct hlist_node *node;
 212
 213         write_lock_bh(&x25_list_lock);
 214
 215         sk_for_each(s, node, &x25_list)
 216                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 217                         x25_disconnect(s, ENETUNREACH, 0, 0);
 218
 219         write_unlock_bh(&x25_list_lock);
 220 }
 221
 222 /*
 223  *      Handle device status changes.
 224  */
 225 static int x25_device_event(struct notifier_block *this, unsigned long event,
 226                             void *ptr)
 227 {
 228         struct net_device *dev = ptr;
 229         struct x25_neigh *nb;
 230
 231         if (!net_eq(dev_net(dev), &init_net))
 232                 return NOTIFY_DONE;
 233
 234         if (dev->type == ARPHRD_X25
 235 #if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 236          || dev->type == ARPHRD_ETHER
 237 #endif
 238          ) {
 239                 switch (event) {
 240                         case NETDEV_UP:
 241                                 x25_link_device_up(dev);
 242                                 break;
 243                         case NETDEV_GOING_DOWN:
 244                                 nb = x25_get_neigh(dev);
 245                                 if (nb) {
 246                                         x25_terminate_link(nb);
 247                                         x25_neigh_put(nb);
 248                                 }
 249                                 break;
 250                         case NETDEV_DOWN:
 251                                 x25_kill_by_device(dev);
 252                                 x25_route_device_down(dev);
 253                                 x25_link_device_down(dev);
 254                                 break;
 255                 }
 256         }
 257
 258         return NOTIFY_DONE;
 259 }
 260
 261 /*
 262  *      Add a socket to the bound sockets list.
 263  */
 264 static void x25_insert_socket(struct sock *sk)
 265 {
 266         write_lock_bh(&x25_list_lock);
 267         sk_add_node(sk, &x25_list);
 268         write_unlock_bh(&x25_list_lock);
 269 }
 270
 271 /*
 272  *      Find a socket that wants to accept the Call Request we just
 273  *      received. Check the full list for an address/cud match.
 274  *      If no cuds match return the next_best thing, an address match.
 275  *      Note: if a listening socket has cud set it must only get calls
 276  *      with matching cud.
 277  */
 278 static struct sock *x25_find_listener(struct x25_address *addr,
 279                                         struct sk_buff *skb)
 280 {
 281         struct sock *s;
 282         struct sock *next_best;
 283         struct hlist_node *node;
 284
 285         read_lock_bh(&x25_list_lock);
 286         next_best = NULL;
 287
 288         sk_for_each(s, node, &x25_list)
 289                 if ((!strcmp(addr->x25_addr,
 290                         x25_sk(s)->source_addr.x25_addr) ||
 291                                 !strcmp(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(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 299                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 300                                         skb->data,
 301                                         x25_sk(s)->cudmatchlength)) == 0) {
 302                                         sock_hold(s);
 303                                         goto found;
 304                                  }
 305                         } else
 306                                 next_best = s;
 307                 }
 308         if (next_best) {
 309                 s = next_best;
 310                 sock_hold(s);
 311                 goto found;
 312         }
 313         s = NULL;
 314 found:
 315         read_unlock_bh(&x25_list_lock);
 316         return s;
 317 }
 318
 319 /*
 320  *      Find a connected X.25 socket given my LCI and neighbour.
 321  */
 322 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 323 {
 324         struct sock *s;
 325         struct hlist_node *node;
 326
 327         sk_for_each(s, node, &x25_list)
 328                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 329                         sock_hold(s);
 330                         goto found;
 331                 }
 332         s = NULL;
 333 found:
 334         return s;
 335 }
 336
 337 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 338 {
 339         struct sock *s;
 340
 341         read_lock_bh(&x25_list_lock);
 342         s = __x25_find_socket(lci, nb);
 343         read_unlock_bh(&x25_list_lock);
 344         return s;
 345 }
 346
 347 /*
 348  *      Find a unique LCI for a given device.
 349  */
 350 static unsigned int x25_new_lci(struct x25_neigh *nb)
 351 {
 352         unsigned int lci = 1;
 353         struct sock *sk;
 354
 355         read_lock_bh(&x25_list_lock);
 356
 357         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 358                 sock_put(sk);
 359                 if (++lci == 4096) {
 360                         lci = 0;
 361                         break;
 362                 }
 363         }
 364
 365         read_unlock_bh(&x25_list_lock);
 366         return lci;
 367 }
 368
 369 /*
 370  *      Deferred destroy.
 371  */
 372 static void __x25_destroy_socket(struct sock *);
 373
 374 /*
 375  *      handler for deferred kills.
 376  */
 377 static void x25_destroy_timer(unsigned long data)
 378 {
 379         x25_destroy_socket_from_timer((struct sock *)data);
 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                 sk->sk_timer.data = (unsigned long)sk;
 418                 add_timer(&sk->sk_timer);
 419         } else {
 420                 /* drop last reference so sock_put will free */
 421                 __sock_put(sk);
 422         }
 423 }
 424
 425 void x25_destroy_socket_from_timer(struct sock *sk)
 426 {
 427         sock_hold(sk);
 428         bh_lock_sock(sk);
 429         __x25_destroy_socket(sk);
 430         bh_unlock_sock(sk);
 431         sock_put(sk);
 432 }
 433
 434 /*
 435  *      Handling for system calls applied via the various interfaces to a
 436  *      X.25 socket object.
 437  */
 438
 439 static int x25_setsockopt(struct socket *sock, int level, int optname,
 440                           char __user *optval, unsigned int optlen)
 441 {
 442         int opt;
 443         struct sock *sk = sock->sk;
 444         int rc = -ENOPROTOOPT;
 445
 446         if (level != SOL_X25 || optname != X25_QBITINCL)
 447                 goto out;
 448
 449         rc = -EINVAL;
 450         if (optlen < sizeof(int))
 451                 goto out;
 452
 453         rc = -EFAULT;
 454         if (get_user(opt, (int __user *)optval))
 455                 goto out;
 456
 457         if (opt)
 458                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 459         else
 460                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 461         rc = 0;
 462 out:
 463         return rc;
 464 }
 465
 466 static int x25_getsockopt(struct socket *sock, int level, int optname,
 467                           char __user *optval, int __user *optlen)
 468 {
 469         struct sock *sk = sock->sk;
 470         int val, len, rc = -ENOPROTOOPT;
 471
 472         if (level != SOL_X25 || optname != X25_QBITINCL)
 473                 goto out;
 474
 475         rc = -EFAULT;
 476         if (get_user(len, optlen))
 477                 goto out;
 478
 479         len = min_t(unsigned int, len, sizeof(int));
 480
 481         rc = -EINVAL;
 482         if (len < 0)
 483                 goto out;
 484
 485         rc = -EFAULT;
 486         if (put_user(len, optlen))
 487                 goto out;
 488
 489         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 490         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 491 out:
 492         return rc;
 493 }
 494
 495 static int x25_listen(struct socket *sock, int backlog)
 496 {
 497         struct sock *sk = sock->sk;
 498         int rc = -EOPNOTSUPP;
 499
 500         lock_sock(sk);
 501         if (sk->sk_state != TCP_LISTEN) {
 502                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 503                 sk->sk_max_ack_backlog = backlog;
 504                 sk->sk_state           = TCP_LISTEN;
 505                 rc = 0;
 506         }
 507         release_sock(sk);
 508
 509         return rc;
 510 }
 511
 512 static struct proto x25_proto = {
 513         .name     = "X25",
 514         .owner    = THIS_MODULE,
 515         .obj_size = sizeof(struct x25_sock),
 516 };
 517
 518 static struct sock *x25_alloc_socket(struct net *net)
 519 {
 520         struct x25_sock *x25;
 521         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 522
 523         if (!sk)
 524                 goto out;
 525
 526         sock_init_data(NULL, sk);
 527
 528         x25 = x25_sk(sk);
 529         skb_queue_head_init(&x25->ack_queue);
 530         skb_queue_head_init(&x25->fragment_queue);
 531         skb_queue_head_init(&x25->interrupt_in_queue);
 532         skb_queue_head_init(&x25->interrupt_out_queue);
 533 out:
 534         return sk;
 535 }
 536
 537 static int x25_create(struct net *net, struct socket *sock, int protocol,
 538                       int kern)
 539 {
 540         struct sock *sk;
 541         struct x25_sock *x25;
 542         int rc = -EAFNOSUPPORT;
 543
 544         if (!net_eq(net, &init_net))
 545                 goto out;
 546
 547         rc = -ESOCKTNOSUPPORT;
 548         if (sock->type != SOCK_SEQPACKET)
 549                 goto out;
 550
 551         rc = -EINVAL;
 552         if (protocol)
 553                 goto out;
 554
 555         rc = -ENOBUFS;
 556         if ((sk = x25_alloc_socket(net)) == NULL)
 557                 goto out;
 558
 559         x25 = x25_sk(sk);
 560
 561         sock_init_data(sock, sk);
 562
 563         x25_init_timers(sk);
 564
 565         sock->ops    = &x25_proto_ops;
 566         sk->sk_protocol = protocol;
 567         sk->sk_backlog_rcv = x25_backlog_rcv;
 568
 569         x25->t21   = sysctl_x25_call_request_timeout;
 570         x25->t22   = sysctl_x25_reset_request_timeout;
 571         x25->t23   = sysctl_x25_clear_request_timeout;
 572         x25->t2    = sysctl_x25_ack_holdback_timeout;
 573         x25->state = X25_STATE_0;
 574         x25->cudmatchlength = 0;
 575         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 576                                                         /* on call accept   */
 577
 578         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 579         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 580         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 581         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 582         x25->facilities.throughput  = 0;        /* by default don't negotiate
 583                                                    throughput */
 584         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 585         x25->dte_facilities.calling_len = 0;
 586         x25->dte_facilities.called_len = 0;
 587         memset(x25->dte_facilities.called_ae, '\0',
 588                         sizeof(x25->dte_facilities.called_ae));
 589         memset(x25->dte_facilities.calling_ae, '\0',
 590                         sizeof(x25->dte_facilities.calling_ae));
 591
 592         rc = 0;
 593 out:
 594         return rc;
 595 }
 596
 597 static struct sock *x25_make_new(struct sock *osk)
 598 {
 599         struct sock *sk = NULL;
 600         struct x25_sock *x25, *ox25;
 601
 602         if (osk->sk_type != SOCK_SEQPACKET)
 603                 goto out;
 604
 605         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 606                 goto out;
 607
 608         x25 = x25_sk(sk);
 609
 610         sk->sk_type        = osk->sk_type;
 611         sk->sk_priority    = osk->sk_priority;
 612         sk->sk_protocol    = osk->sk_protocol;
 613         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 614         sk->sk_sndbuf      = osk->sk_sndbuf;
 615         sk->sk_state       = TCP_ESTABLISHED;
 616         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 617         sock_copy_flags(sk, osk);
 618
 619         ox25 = x25_sk(osk);
 620         x25->t21        = ox25->t21;
 621         x25->t22        = ox25->t22;
 622         x25->t23        = ox25->t23;
 623         x25->t2         = ox25->t2;
 624         x25->flags      = ox25->flags;
 625         x25->facilities = ox25->facilities;
 626         x25->dte_facilities = ox25->dte_facilities;
 627         x25->cudmatchlength = ox25->cudmatchlength;
 628
 629         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 630         x25_init_timers(sk);
 631 out:
 632         return sk;
 633 }
 634
 635 static int x25_release(struct socket *sock)
 636 {
 637         struct sock *sk = sock->sk;
 638         struct x25_sock *x25;
 639
 640         if (!sk)
 641                 return 0;
 642
 643         x25 = x25_sk(sk);
 644
 645         sock_hold(sk);
 646         lock_sock(sk);
 647         switch (x25->state) {
 648
 649                 case X25_STATE_0:
 650                 case X25_STATE_2:
 651                         x25_disconnect(sk, 0, 0, 0);
 652                         __x25_destroy_socket(sk);
 653                         goto out;
 654
 655                 case X25_STATE_1:
 656                 case X25_STATE_3:
 657                 case X25_STATE_4:
 658                         x25_clear_queues(sk);
 659                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 660                         x25_start_t23timer(sk);
 661                         x25->state = X25_STATE_2;
 662                         sk->sk_state    = TCP_CLOSE;
 663                         sk->sk_shutdown |= SEND_SHUTDOWN;
 664                         sk->sk_state_change(sk);
 665                         sock_set_flag(sk, SOCK_DEAD);
 666                         sock_set_flag(sk, SOCK_DESTROY);
 667                         break;
 668         }
 669
 670         sock_orphan(sk);
 671 out:
 672         release_sock(sk);
 673         sock_put(sk);
 674         return 0;
 675 }
 676
 677 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 678 {
 679         struct sock *sk = sock->sk;
 680         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 681         int len, i, rc = 0;
 682
 683         if (!sock_flag(sk, SOCK_ZAPPED) ||
 684             addr_len != sizeof(struct sockaddr_x25) ||
 685             addr->sx25_family != AF_X25) {
 686                 rc = -EINVAL;
 687                 goto out;
 688         }
 689
 690         len = strlen(addr->sx25_addr.x25_addr);
 691         for (i = 0; i < len; i++) {
 692                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 693                         rc = -EINVAL;
 694                         goto out;
 695                 }
 696         }
 697
 698         lock_sock(sk);
 699         x25_sk(sk)->source_addr = addr->sx25_addr;
 700         x25_insert_socket(sk);
 701         sock_reset_flag(sk, SOCK_ZAPPED);
 702         release_sock(sk);
 703         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 704 out:
 705         return rc;
 706 }
 707
 708 static int x25_wait_for_connection_establishment(struct sock *sk)
 709 {
 710         DECLARE_WAITQUEUE(wait, current);
 711         int rc;
 712
 713         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 714         for (;;) {
 715                 __set_current_state(TASK_INTERRUPTIBLE);
 716                 rc = -ERESTARTSYS;
 717                 if (signal_pending(current))
 718                         break;
 719                 rc = sock_error(sk);
 720                 if (rc) {
 721                         sk->sk_socket->state = SS_UNCONNECTED;
 722                         break;
 723                 }
 724                 rc = 0;
 725                 if (sk->sk_state != TCP_ESTABLISHED) {
 726                         release_sock(sk);
 727                         schedule();
 728                         lock_sock(sk);
 729                 } else
 730                         break;
 731         }
 732         __set_current_state(TASK_RUNNING);
 733         remove_wait_queue(sk_sleep(sk), &wait);
 734         return rc;
 735 }
 736
 737 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 738                        int addr_len, int flags)
 739 {
 740         struct sock *sk = sock->sk;
 741         struct x25_sock *x25 = x25_sk(sk);
 742         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 743         struct x25_route *rt;
 744         int rc = 0;
 745
 746         lock_sock(sk);
 747         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 748                 sock->state = SS_CONNECTED;
 749                 goto out; /* Connect completed during a ERESTARTSYS event */
 750         }
 751
 752         rc = -ECONNREFUSED;
 753         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 754                 sock->state = SS_UNCONNECTED;
 755                 goto out;
 756         }
 757
 758         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 759         if (sk->sk_state == TCP_ESTABLISHED)
 760                 goto out;
 761
 762         sk->sk_state   = TCP_CLOSE;
 763         sock->state = SS_UNCONNECTED;
 764
 765         rc = -EINVAL;
 766         if (addr_len != sizeof(struct sockaddr_x25) ||
 767             addr->sx25_family != AF_X25)
 768                 goto out;
 769
 770         rc = -ENETUNREACH;
 771         rt = x25_get_route(&addr->sx25_addr);
 772         if (!rt)
 773                 goto out;
 774
 775         x25->neighbour = x25_get_neigh(rt->dev);
 776         if (!x25->neighbour)
 777                 goto out_put_route;
 778
 779         x25_limit_facilities(&x25->facilities, x25->neighbour);
 780
 781         x25->lci = x25_new_lci(x25->neighbour);
 782         if (!x25->lci)
 783                 goto out_put_neigh;
 784
 785         rc = -EINVAL;
 786         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 787                 goto out_put_neigh;
 788
 789         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 790                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 791
 792         x25->dest_addr = addr->sx25_addr;
 793
 794         /* Move to connecting socket, start sending Connect Requests */
 795         sock->state   = SS_CONNECTING;
 796         sk->sk_state  = TCP_SYN_SENT;
 797
 798         x25->state = X25_STATE_1;
 799
 800         x25_write_internal(sk, X25_CALL_REQUEST);
 801
 802         x25_start_heartbeat(sk);
 803         x25_start_t21timer(sk);
 804
 805         /* Now the loop */
 806         rc = -EINPROGRESS;
 807         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 808                 goto out_put_neigh;
 809
 810         rc = x25_wait_for_connection_establishment(sk);
 811         if (rc)
 812                 goto out_put_neigh;
 813
 814         sock->state = SS_CONNECTED;
 815         rc = 0;
 816 out_put_neigh:
 817         if (rc)
 818                 x25_neigh_put(x25->neighbour);
 819 out_put_route:
 820         x25_route_put(rt);
 821 out:
 822         release_sock(sk);
 823         return rc;
 824 }
 825
 826 static int x25_wait_for_data(struct sock *sk, long timeout)
 827 {
 828         DECLARE_WAITQUEUE(wait, current);
 829         int rc = 0;
 830
 831         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 832         for (;;) {
 833                 __set_current_state(TASK_INTERRUPTIBLE);
 834                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 835                         break;
 836                 rc = -ERESTARTSYS;
 837                 if (signal_pending(current))
 838                         break;
 839                 rc = -EAGAIN;
 840                 if (!timeout)
 841                         break;
 842                 rc = 0;
 843                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 844                         release_sock(sk);
 845                         timeout = schedule_timeout(timeout);
 846                         lock_sock(sk);
 847                 } else
 848                         break;
 849         }
 850         __set_current_state(TASK_RUNNING);
 851         remove_wait_queue(sk_sleep(sk), &wait);
 852         return rc;
 853 }
 854
 855 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 856 {
 857         struct sock *sk = sock->sk;
 858         struct sock *newsk;
 859         struct sk_buff *skb;
 860         int rc = -EINVAL;
 861
 862         if (!sk)
 863                 goto out;
 864
 865         rc = -EOPNOTSUPP;
 866         if (sk->sk_type != SOCK_SEQPACKET)
 867                 goto out;
 868
 869         lock_sock(sk);
 870         rc = -EINVAL;
 871         if (sk->sk_state != TCP_LISTEN)
 872                 goto out2;
 873
 874         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 875         if (rc)
 876                 goto out2;
 877         skb = skb_dequeue(&sk->sk_receive_queue);
 878         rc = -EINVAL;
 879         if (!skb->sk)
 880                 goto out2;
 881         newsk            = skb->sk;
 882         sock_graft(newsk, newsock);
 883
 884         /* Now attach up the new socket */
 885         skb->sk = NULL;
 886         kfree_skb(skb);
 887         sk->sk_ack_backlog--;
 888         newsock->state = SS_CONNECTED;
 889         rc = 0;
 890 out2:
 891         release_sock(sk);
 892 out:
 893         return rc;
 894 }
 895
 896 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 897                        int *uaddr_len, int peer)
 898 {
 899         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 900         struct sock *sk = sock->sk;
 901         struct x25_sock *x25 = x25_sk(sk);
 902         int rc = 0;
 903
 904         if (peer) {
 905                 if (sk->sk_state != TCP_ESTABLISHED) {
 906                         rc = -ENOTCONN;
 907                         goto out;
 908                 }
 909                 sx25->sx25_addr = x25->dest_addr;
 910         } else
 911                 sx25->sx25_addr = x25->source_addr;
 912
 913         sx25->sx25_family = AF_X25;
 914         *uaddr_len = sizeof(*sx25);
 915
 916 out:
 917         return rc;
 918 }
 919
 920 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 921                         unsigned int lci)
 922 {
 923         struct sock *sk;
 924         struct sock *make;
 925         struct x25_sock *makex25;
 926         struct x25_address source_addr, dest_addr;
 927         struct x25_facilities facilities;
 928         struct x25_dte_facilities dte_facilities;
 929         int len, addr_len, rc;
 930
 931         /*
 932          *      Remove the LCI and frame type.
 933          */
 934         skb_pull(skb, X25_STD_MIN_LEN);
 935
 936         /*
 937          *      Extract the X.25 addresses and convert them to ASCII strings,
 938          *      and remove them.
 939          *
 940          *      Address block is mandatory in call request packets
 941          */
 942         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 943         if (addr_len <= 0)
 944                 goto out_clear_request;
 945         skb_pull(skb, addr_len);
 946
 947         /*
 948          *      Get the length of the facilities, skip past them for the moment
 949          *      get the call user data because this is needed to determine
 950          *      the correct listener
 951          *
 952          *      Facilities length is mandatory in call request packets
 953          */
 954         if (skb->len < 1)
 955                 goto out_clear_request;
 956         len = skb->data[0] + 1;
 957         if (skb->len < len)
 958                 goto out_clear_request;
 959         skb_pull(skb,len);
 960
 961         /*
 962          *      Find a listener for the particular address/cud pair.
 963          */
 964         sk = x25_find_listener(&source_addr,skb);
 965         skb_push(skb,len);
 966
 967         if (sk != NULL && sk_acceptq_is_full(sk)) {
 968                 goto out_sock_put;
 969         }
 970
 971         /*
 972          *      We dont have any listeners for this incoming call.
 973          *      Try forwarding it.
 974          */
 975         if (sk == NULL) {
 976                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 977                 if (sysctl_x25_forward &&
 978                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 979                 {
 980                         /* Call was forwarded, dont process it any more */
 981                         kfree_skb(skb);
 982                         rc = 1;
 983                         goto out;
 984                 } else {
 985                         /* No listeners, can't forward, clear the call */
 986                         goto out_clear_request;
 987                 }
 988         }
 989
 990         /*
 991          *      Try to reach a compromise on the requested facilities.
 992          */
 993         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
 994         if (len == -1)
 995                 goto out_sock_put;
 996
 997         /*
 998          * current neighbour/link might impose additional limits
 999          * on certain facilties
1000          */
1001
1002         x25_limit_facilities(&facilities, nb);
1003
1004         /*
1005          *      Try to create a new socket.
1006          */
1007         make = x25_make_new(sk);
1008         if (!make)
1009                 goto out_sock_put;
1010
1011         /*
1012          *      Remove the facilities
1013          */
1014         skb_pull(skb, len);
1015
1016         skb->sk     = make;
1017         make->sk_state = TCP_ESTABLISHED;
1018
1019         makex25 = x25_sk(make);
1020         makex25->lci           = lci;
1021         makex25->dest_addr     = dest_addr;
1022         makex25->source_addr   = source_addr;
1023         makex25->neighbour     = nb;
1024         makex25->facilities    = facilities;
1025         makex25->dte_facilities= dte_facilities;
1026         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1027         /* ensure no reverse facil on accept */
1028         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1029         /* ensure no calling address extension on accept */
1030         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1031         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1032
1033         /* Normally all calls are accepted immediately */
1034         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1035                 x25_write_internal(make, X25_CALL_ACCEPTED);
1036                 makex25->state = X25_STATE_3;
1037         }
1038
1039         /*
1040          *      Incoming Call User Data.
1041          */
1042         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1043         makex25->calluserdata.cudlength = skb->len;
1044
1045         sk->sk_ack_backlog++;
1046
1047         x25_insert_socket(make);
1048
1049         skb_queue_head(&sk->sk_receive_queue, skb);
1050
1051         x25_start_heartbeat(make);
1052
1053         if (!sock_flag(sk, SOCK_DEAD))
1054                 sk->sk_data_ready(sk, skb->len);
1055         rc = 1;
1056         sock_put(sk);
1057 out:
1058         return rc;
1059 out_sock_put:
1060         sock_put(sk);
1061 out_clear_request:
1062         rc = 0;
1063         x25_transmit_clear_request(nb, lci, 0x01);
1064         goto out;
1065 }
1066
1067 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1068                        struct msghdr *msg, size_t len)
1069 {
1070         struct sock *sk = sock->sk;
1071         struct x25_sock *x25 = x25_sk(sk);
1072         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1073         struct sockaddr_x25 sx25;
1074         struct sk_buff *skb;
1075         unsigned char *asmptr;
1076         int noblock = msg->msg_flags & MSG_DONTWAIT;
1077         size_t size;
1078         int qbit = 0, rc = -EINVAL;
1079
1080         lock_sock(sk);
1081         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1082                 goto out;
1083
1084         /* we currently don't support segmented records at the user interface */
1085         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1086                 goto out;
1087
1088         rc = -EADDRNOTAVAIL;
1089         if (sock_flag(sk, SOCK_ZAPPED))
1090                 goto out;
1091
1092         rc = -EPIPE;
1093         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1094                 send_sig(SIGPIPE, current, 0);
1095                 goto out;
1096         }
1097
1098         rc = -ENETUNREACH;
1099         if (!x25->neighbour)
1100                 goto out;
1101
1102         if (usx25) {
1103                 rc = -EINVAL;
1104                 if (msg->msg_namelen < sizeof(sx25))
1105                         goto out;
1106                 memcpy(&sx25, usx25, sizeof(sx25));
1107                 rc = -EISCONN;
1108                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1109                         goto out;
1110                 rc = -EINVAL;
1111                 if (sx25.sx25_family != AF_X25)
1112                         goto out;
1113         } else {
1114                 /*
1115                  *      FIXME 1003.1g - if the socket is like this because
1116                  *      it has become closed (not started closed) we ought
1117                  *      to SIGPIPE, EPIPE;
1118                  */
1119                 rc = -ENOTCONN;
1120                 if (sk->sk_state != TCP_ESTABLISHED)
1121                         goto out;
1122
1123                 sx25.sx25_family = AF_X25;
1124                 sx25.sx25_addr   = x25->dest_addr;
1125         }
1126
1127         /* Sanity check the packet size */
1128         if (len > 65535) {
1129                 rc = -EMSGSIZE;
1130                 goto out;
1131         }
1132
1133         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1134
1135         /* Build a packet */
1136         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1137
1138         if ((msg->msg_flags & MSG_OOB) && len > 32)
1139                 len = 32;
1140
1141         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1142
1143         release_sock(sk);
1144         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1145         lock_sock(sk);
1146         if (!skb)
1147                 goto out;
1148         X25_SKB_CB(skb)->flags = msg->msg_flags;
1149
1150         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1151
1152         /*
1153          *      Put the data on the end
1154          */
1155         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1156
1157         skb_reset_transport_header(skb);
1158         skb_put(skb, len);
1159
1160         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1161         if (rc)
1162                 goto out_kfree_skb;
1163
1164         /*
1165          *      If the Q BIT Include socket option is in force, the first
1166          *      byte of the user data is the logical value of the Q Bit.
1167          */
1168         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1169                 qbit = skb->data[0];
1170                 skb_pull(skb, 1);
1171         }
1172
1173         /*
1174          *      Push down the X.25 header
1175          */
1176         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1177
1178         if (msg->msg_flags & MSG_OOB) {
1179                 if (x25->neighbour->extended) {
1180                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1181                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1182                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1183                         *asmptr++ = X25_INTERRUPT;
1184                 } else {
1185                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1186                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1187                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1188                         *asmptr++ = X25_INTERRUPT;
1189                 }
1190         } else {
1191                 if (x25->neighbour->extended) {
1192                         /* Build an Extended X.25 header */
1193                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1194                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1195                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1196                         *asmptr++ = X25_DATA;
1197                         *asmptr++ = X25_DATA;
1198                 } else {
1199                         /* Build an Standard X.25 header */
1200                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1201                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1202                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1203                         *asmptr++ = X25_DATA;
1204                 }
1205
1206                 if (qbit)
1207                         skb->data[0] |= X25_Q_BIT;
1208         }
1209
1210         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1211         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1212
1213         rc = -ENOTCONN;
1214         if (sk->sk_state != TCP_ESTABLISHED)
1215                 goto out_kfree_skb;
1216
1217         if (msg->msg_flags & MSG_OOB)
1218                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1219         else {
1220                 rc = x25_output(sk, skb);
1221                 len = rc;
1222                 if (rc < 0)
1223                         kfree_skb(skb);
1224                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1225                         len++;
1226         }
1227
1228         x25_kick(sk);
1229         rc = len;
1230 out:
1231         release_sock(sk);
1232         return rc;
1233 out_kfree_skb:
1234         kfree_skb(skb);
1235         goto out;
1236 }
1237
1238
1239 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1240                        struct msghdr *msg, size_t size,
1241                        int flags)
1242 {
1243         struct sock *sk = sock->sk;
1244         struct x25_sock *x25 = x25_sk(sk);
1245         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1246         size_t copied;
1247         int qbit;
1248         struct sk_buff *skb;
1249         unsigned char *asmptr;
1250         int rc = -ENOTCONN;
1251
1252         lock_sock(sk);
1253         /*
1254          * This works for seqpacket too. The receiver has ordered the queue for
1255          * us! We do one quick check first though
1256          */
1257         if (sk->sk_state != TCP_ESTABLISHED)
1258                 goto out;
1259
1260         if (flags & MSG_OOB) {
1261                 rc = -EINVAL;
1262                 if (sock_flag(sk, SOCK_URGINLINE) ||
1263                     !skb_peek(&x25->interrupt_in_queue))
1264                         goto out;
1265
1266                 skb = skb_dequeue(&x25->interrupt_in_queue);
1267
1268                 skb_pull(skb, X25_STD_MIN_LEN);
1269
1270                 /*
1271                  *      No Q bit information on Interrupt data.
1272                  */
1273                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1274                         asmptr  = skb_push(skb, 1);
1275                         *asmptr = 0x00;
1276                 }
1277
1278                 msg->msg_flags |= MSG_OOB;
1279         } else {
1280                 /* Now we can treat all alike */
1281                 release_sock(sk);
1282                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1283                                         flags & MSG_DONTWAIT, &rc);
1284                 lock_sock(sk);
1285                 if (!skb)
1286                         goto out;
1287
1288                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1289
1290                 skb_pull(skb, x25->neighbour->extended ?
1291                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1292
1293                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1294                         asmptr  = skb_push(skb, 1);
1295                         *asmptr = qbit;
1296                 }
1297         }
1298
1299         skb_reset_transport_header(skb);
1300         copied = skb->len;
1301
1302         if (copied > size) {
1303                 copied = size;
1304                 msg->msg_flags |= MSG_TRUNC;
1305         }
1306
1307         /* Currently, each datagram always contains a complete record */
1308         msg->msg_flags |= MSG_EOR;
1309
1310         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1311         if (rc)
1312                 goto out_free_dgram;
1313
1314         if (sx25) {
1315                 sx25->sx25_family = AF_X25;
1316                 sx25->sx25_addr   = x25->dest_addr;
1317         }
1318
1319         msg->msg_namelen = sizeof(struct sockaddr_x25);
1320
1321         x25_check_rbuf(sk);
1322         rc = copied;
1323 out_free_dgram:
1324         skb_free_datagram(sk, skb);
1325 out:
1326         release_sock(sk);
1327         return rc;
1328 }
1329
1330
1331 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1332 {
1333         struct sock *sk = sock->sk;
1334         struct x25_sock *x25 = x25_sk(sk);
1335         void __user *argp = (void __user *)arg;
1336         int rc;
1337
1338         switch (cmd) {
1339                 case TIOCOUTQ: {
1340                         int amount;
1341
1342                         amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1343                         if (amount < 0)
1344                                 amount = 0;
1345                         rc = put_user(amount, (unsigned int __user *)argp);
1346                         break;
1347                 }
1348
1349                 case TIOCINQ: {
1350                         struct sk_buff *skb;
1351                         int amount = 0;
1352                         /*
1353                          * These two are safe on a single CPU system as
1354                          * only user tasks fiddle here
1355                          */
1356                         lock_sock(sk);
1357                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1358                                 amount = skb->len;
1359                         release_sock(sk);
1360                         rc = put_user(amount, (unsigned int __user *)argp);
1361                         break;
1362                 }
1363
1364                 case SIOCGSTAMP:
1365                         rc = -EINVAL;
1366                         if (sk)
1367                                 rc = sock_get_timestamp(sk,
1368                                                 (struct timeval __user *)argp);
1369                         break;
1370                 case SIOCGSTAMPNS:
1371                         rc = -EINVAL;
1372                         if (sk)
1373                                 rc = sock_get_timestampns(sk,
1374                                                 (struct timespec __user *)argp);
1375                         break;
1376                 case SIOCGIFADDR:
1377                 case SIOCSIFADDR:
1378                 case SIOCGIFDSTADDR:
1379                 case SIOCSIFDSTADDR:
1380                 case SIOCGIFBRDADDR:
1381                 case SIOCSIFBRDADDR:
1382                 case SIOCGIFNETMASK:
1383                 case SIOCSIFNETMASK:
1384                 case SIOCGIFMETRIC:
1385                 case SIOCSIFMETRIC:
1386                         rc = -EINVAL;
1387                         break;
1388                 case SIOCADDRT:
1389                 case SIOCDELRT:
1390                         rc = -EPERM;
1391                         if (!capable(CAP_NET_ADMIN))
1392                                 break;
1393                         rc = x25_route_ioctl(cmd, argp);
1394                         break;
1395                 case SIOCX25GSUBSCRIP:
1396                         rc = x25_subscr_ioctl(cmd, argp);
1397                         break;
1398                 case SIOCX25SSUBSCRIP:
1399                         rc = -EPERM;
1400                         if (!capable(CAP_NET_ADMIN))
1401                                 break;
1402                         rc = x25_subscr_ioctl(cmd, argp);
1403                         break;
1404                 case SIOCX25GFACILITIES: {
1405                         lock_sock(sk);
1406                         rc = copy_to_user(argp, &x25->facilities,
1407                                                 sizeof(x25->facilities))
1408                                                 ? -EFAULT : 0;
1409                         release_sock(sk);
1410                         break;
1411                 }
1412
1413                 case SIOCX25SFACILITIES: {
1414                         struct x25_facilities facilities;
1415                         rc = -EFAULT;
1416                         if (copy_from_user(&facilities, argp,
1417                                            sizeof(facilities)))
1418                                 break;
1419                         rc = -EINVAL;
1420                         lock_sock(sk);
1421                         if (sk->sk_state != TCP_LISTEN &&
1422                             sk->sk_state != TCP_CLOSE)
1423                                 goto out_fac_release;
1424                         if (facilities.pacsize_in < X25_PS16 ||
1425                             facilities.pacsize_in > X25_PS4096)
1426                                 goto out_fac_release;
1427                         if (facilities.pacsize_out < X25_PS16 ||
1428                             facilities.pacsize_out > X25_PS4096)
1429                                 goto out_fac_release;
1430                         if (facilities.winsize_in < 1 ||
1431                             facilities.winsize_in > 127)
1432                                 goto out_fac_release;
1433                         if (facilities.throughput) {
1434                                 int out = facilities.throughput & 0xf0;
1435                                 int in  = facilities.throughput & 0x0f;
1436                                 if (!out)
1437                                         facilities.throughput |=
1438                                                 X25_DEFAULT_THROUGHPUT << 4;
1439                                 else if (out < 0x30 || out > 0xD0)
1440                                         goto out_fac_release;
1441                                 if (!in)
1442                                         facilities.throughput |=
1443                                                 X25_DEFAULT_THROUGHPUT;
1444                                 else if (in < 0x03 || in > 0x0D)
1445                                         goto out_fac_release;
1446                         }
1447                         if (facilities.reverse &&
1448                                 (facilities.reverse & 0x81) != 0x81)
1449                                 goto out_fac_release;
1450                         x25->facilities = facilities;
1451                         rc = 0;
1452 out_fac_release:
1453                         release_sock(sk);
1454                         break;
1455                 }
1456
1457                 case SIOCX25GDTEFACILITIES: {
1458                         lock_sock(sk);
1459                         rc = copy_to_user(argp, &x25->dte_facilities,
1460                                                 sizeof(x25->dte_facilities));
1461                         release_sock(sk);
1462                         if (rc)
1463                                 rc = -EFAULT;
1464                         break;
1465                 }
1466
1467                 case SIOCX25SDTEFACILITIES: {
1468                         struct x25_dte_facilities dtefacs;
1469                         rc = -EFAULT;
1470                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1471                                 break;
1472                         rc = -EINVAL;
1473                         lock_sock(sk);
1474                         if (sk->sk_state != TCP_LISTEN &&
1475                                         sk->sk_state != TCP_CLOSE)
1476                                 goto out_dtefac_release;
1477                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1478                                 goto out_dtefac_release;
1479                         if (dtefacs.calling_ae == NULL)
1480                                 goto out_dtefac_release;
1481                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1482                                 goto out_dtefac_release;
1483                         if (dtefacs.called_ae == NULL)
1484                                 goto out_dtefac_release;
1485                         x25->dte_facilities = dtefacs;
1486                         rc = 0;
1487 out_dtefac_release:
1488                         release_sock(sk);
1489                         break;
1490                 }
1491
1492                 case SIOCX25GCALLUSERDATA: {
1493                         lock_sock(sk);
1494                         rc = copy_to_user(argp, &x25->calluserdata,
1495                                         sizeof(x25->calluserdata))
1496                                         ? -EFAULT : 0;
1497                         release_sock(sk);
1498                         break;
1499                 }
1500
1501                 case SIOCX25SCALLUSERDATA: {
1502                         struct x25_calluserdata calluserdata;
1503
1504                         rc = -EFAULT;
1505                         if (copy_from_user(&calluserdata, argp,
1506                                            sizeof(calluserdata)))
1507                                 break;
1508                         rc = -EINVAL;
1509                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1510                                 break;
1511                         lock_sock(sk);
1512                         x25->calluserdata = calluserdata;
1513                         release_sock(sk);
1514                         rc = 0;
1515                         break;
1516                 }
1517
1518                 case SIOCX25GCAUSEDIAG: {
1519                         lock_sock(sk);
1520                         rc = copy_to_user(argp, &x25->causediag,
1521                                         sizeof(x25->causediag))
1522                                         ? -EFAULT : 0;
1523                         release_sock(sk);
1524                         break;
1525                 }
1526
1527                 case SIOCX25SCAUSEDIAG: {
1528                         struct x25_causediag causediag;
1529                         rc = -EFAULT;
1530                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1531                                 break;
1532                         lock_sock(sk);
1533                         x25->causediag = causediag;
1534                         release_sock(sk);
1535                         rc = 0;
1536                         break;
1537
1538                 }
1539
1540                 case SIOCX25SCUDMATCHLEN: {
1541                         struct x25_subaddr sub_addr;
1542                         rc = -EINVAL;
1543                         lock_sock(sk);
1544                         if(sk->sk_state != TCP_CLOSE)
1545                                 goto out_cud_release;
1546                         rc = -EFAULT;
1547                         if (copy_from_user(&sub_addr, argp,
1548                                         sizeof(sub_addr)))
1549                                 goto out_cud_release;
1550                         rc = -EINVAL;
1551                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1552                                 goto out_cud_release;
1553                         x25->cudmatchlength = sub_addr.cudmatchlength;
1554                         rc = 0;
1555 out_cud_release:
1556                         release_sock(sk);
1557                         break;
1558                 }
1559
1560                 case SIOCX25CALLACCPTAPPRV: {
1561                         rc = -EINVAL;
1562                         lock_sock(sk);
1563                         if (sk->sk_state != TCP_CLOSE)
1564                                 break;
1565                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1566                         release_sock(sk);
1567                         rc = 0;
1568                         break;
1569                 }
1570
1571                 case SIOCX25SENDCALLACCPT:  {
1572                         rc = -EINVAL;
1573                         lock_sock(sk);
1574                         if (sk->sk_state != TCP_ESTABLISHED)
1575                                 break;
1576                         /* must call accptapprv above */
1577                         if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1578                                 break;
1579                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1580                         x25->state = X25_STATE_3;
1581                         release_sock(sk);
1582                         rc = 0;
1583                         break;
1584                 }
1585
1586                 default:
1587                         rc = -ENOIOCTLCMD;
1588                         break;
1589         }
1590
1591         return rc;
1592 }
1593
1594 static const struct net_proto_family x25_family_ops = {
1595         .family =       AF_X25,
1596         .create =       x25_create,
1597         .owner  =       THIS_MODULE,
1598 };
1599
1600 #ifdef CONFIG_COMPAT
1601 static int compat_x25_subscr_ioctl(unsigned int cmd,
1602                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1603 {
1604         struct compat_x25_subscrip_struct x25_subscr;
1605         struct x25_neigh *nb;
1606         struct net_device *dev;
1607         int rc = -EINVAL;
1608
1609         rc = -EFAULT;
1610         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1611                 goto out;
1612
1613         rc = -EINVAL;
1614         dev = x25_dev_get(x25_subscr.device);
1615         if (dev == NULL)
1616                 goto out;
1617
1618         nb = x25_get_neigh(dev);
1619         if (nb == NULL)
1620                 goto out_dev_put;
1621
1622         dev_put(dev);
1623
1624         if (cmd == SIOCX25GSUBSCRIP) {
1625                 read_lock_bh(&x25_neigh_list_lock);
1626                 x25_subscr.extended = nb->extended;
1627                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1628                 read_unlock_bh(&x25_neigh_list_lock);
1629                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1630                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1631         } else {
1632                 rc = -EINVAL;
1633                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1634                         rc = 0;
1635                         write_lock_bh(&x25_neigh_list_lock);
1636                         nb->extended = x25_subscr.extended;
1637                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1638                         write_unlock_bh(&x25_neigh_list_lock);
1639                 }
1640         }
1641         x25_neigh_put(nb);
1642 out:
1643         return rc;
1644 out_dev_put:
1645         dev_put(dev);
1646         goto out;
1647 }
1648
1649 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1650                                 unsigned long arg)
1651 {
1652         void __user *argp = compat_ptr(arg);
1653         struct sock *sk = sock->sk;
1654
1655         int rc = -ENOIOCTLCMD;
1656
1657         switch(cmd) {
1658         case TIOCOUTQ:
1659         case TIOCINQ:
1660                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1661                 break;
1662         case SIOCGSTAMP:
1663                 rc = -EINVAL;
1664                 if (sk)
1665                         rc = compat_sock_get_timestamp(sk,
1666                                         (struct timeval __user*)argp);
1667                 break;
1668         case SIOCGSTAMPNS:
1669                 rc = -EINVAL;
1670                 if (sk)
1671                         rc = compat_sock_get_timestampns(sk,
1672                                         (struct timespec __user*)argp);
1673                 break;
1674         case SIOCGIFADDR:
1675         case SIOCSIFADDR:
1676         case SIOCGIFDSTADDR:
1677         case SIOCSIFDSTADDR:
1678         case SIOCGIFBRDADDR:
1679         case SIOCSIFBRDADDR:
1680         case SIOCGIFNETMASK:
1681         case SIOCSIFNETMASK:
1682         case SIOCGIFMETRIC:
1683         case SIOCSIFMETRIC:
1684                 rc = -EINVAL;
1685                 break;
1686         case SIOCADDRT:
1687         case SIOCDELRT:
1688                 rc = -EPERM;
1689                 if (!capable(CAP_NET_ADMIN))
1690                         break;
1691                 rc = x25_route_ioctl(cmd, argp);
1692                 break;
1693         case SIOCX25GSUBSCRIP:
1694                 rc = compat_x25_subscr_ioctl(cmd, argp);
1695                 break;
1696         case SIOCX25SSUBSCRIP:
1697                 rc = -EPERM;
1698                 if (!capable(CAP_NET_ADMIN))
1699                         break;
1700                 rc = compat_x25_subscr_ioctl(cmd, argp);
1701                 break;
1702         case SIOCX25GFACILITIES:
1703         case SIOCX25SFACILITIES:
1704         case SIOCX25GDTEFACILITIES:
1705         case SIOCX25SDTEFACILITIES:
1706         case SIOCX25GCALLUSERDATA:
1707         case SIOCX25SCALLUSERDATA:
1708         case SIOCX25GCAUSEDIAG:
1709         case SIOCX25SCAUSEDIAG:
1710         case SIOCX25SCUDMATCHLEN:
1711         case SIOCX25CALLACCPTAPPRV:
1712         case SIOCX25SENDCALLACCPT:
1713                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1714                 break;
1715         default:
1716                 rc = -ENOIOCTLCMD;
1717                 break;
1718         }
1719         return rc;
1720 }
1721 #endif
1722
1723 static const struct proto_ops x25_proto_ops = {
1724         .family =       AF_X25,
1725         .owner =        THIS_MODULE,
1726         .release =      x25_release,
1727         .bind =         x25_bind,
1728         .connect =      x25_connect,
1729         .socketpair =   sock_no_socketpair,
1730         .accept =       x25_accept,
1731         .getname =      x25_getname,
1732         .poll =         datagram_poll,
1733         .ioctl =        x25_ioctl,
1734 #ifdef CONFIG_COMPAT
1735         .compat_ioctl = compat_x25_ioctl,
1736 #endif
1737         .listen =       x25_listen,
1738         .shutdown =     sock_no_shutdown,
1739         .setsockopt =   x25_setsockopt,
1740         .getsockopt =   x25_getsockopt,
1741         .sendmsg =      x25_sendmsg,
1742         .recvmsg =      x25_recvmsg,
1743         .mmap =         sock_no_mmap,
1744         .sendpage =     sock_no_sendpage,
1745 };
1746
1747 static struct packet_type x25_packet_type __read_mostly = {
1748         .type = cpu_to_be16(ETH_P_X25),
1749         .func = x25_lapb_receive_frame,
1750 };
1751
1752 static struct notifier_block x25_dev_notifier = {
1753         .notifier_call = x25_device_event,
1754 };
1755
1756 void x25_kill_by_neigh(struct x25_neigh *nb)
1757 {
1758         struct sock *s;
1759         struct hlist_node *node;
1760
1761         write_lock_bh(&x25_list_lock);
1762
1763         sk_for_each(s, node, &x25_list)
1764                 if (x25_sk(s)->neighbour == nb)
1765                         x25_disconnect(s, ENETUNREACH, 0, 0);
1766
1767         write_unlock_bh(&x25_list_lock);
1768
1769         /* Remove any related forwards */
1770         x25_clear_forward_by_dev(nb->dev);
1771 }
1772
1773 static int __init x25_init(void)
1774 {
1775         int rc = proto_register(&x25_proto, 0);
1776
1777         if (rc != 0)
1778                 goto out;
1779
1780         rc = sock_register(&x25_family_ops);
1781         if (rc != 0)
1782                 goto out_proto;
1783
1784         dev_add_pack(&x25_packet_type);
1785
1786         rc = register_netdevice_notifier(&x25_dev_notifier);
1787         if (rc != 0)
1788                 goto out_sock;
1789
1790         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1791
1792         x25_register_sysctl();
1793         rc = x25_proc_init();
1794         if (rc != 0)
1795                 goto out_dev;
1796 out:
1797         return rc;
1798 out_dev:
1799         unregister_netdevice_notifier(&x25_dev_notifier);
1800 out_sock:
1801         sock_unregister(AF_X25);
1802 out_proto:
1803         proto_unregister(&x25_proto);
1804         goto out;
1805 }
1806 module_init(x25_init);
1807
1808 static void __exit x25_exit(void)
1809 {
1810         x25_proc_exit();
1811         x25_link_free();
1812         x25_route_free();
1813
1814         x25_unregister_sysctl();
1815
1816         unregister_netdevice_notifier(&x25_dev_notifier);
1817
1818         dev_remove_pack(&x25_packet_type);
1819
1820         sock_unregister(AF_X25);
1821         proto_unregister(&x25_proto);
1822 }
1823 module_exit(x25_exit);
1824
1825 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1826 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1827 MODULE_LICENSE("GPL");
1828 MODULE_ALIAS_NETPROTO(PF_X25);