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/smp_lock.h>
  44 #include <linux/timer.h>
  45 #include <linux/string.h>
  46 #include <linux/net.h>
  47 #include <linux/netdevice.h>
  48 #include <linux/if_arp.h>
  49 #include <linux/skbuff.h>
  50 #include <linux/slab.h>
  51 #include <net/sock.h>
  52 #include <net/tcp_states.h>
  53 #include <asm/uaccess.h>
  54 #include <linux/fcntl.h>
  55 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  56 #include <linux/notifier.h>
  57 #include <linux/init.h>
  58 #include <linux/compat.h>
  59 #include <linux/ctype.h>
  60
  61 #include <net/x25.h>
  62 #include <net/compat.h>
  63
  64 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  65 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  66 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  67 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  68 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  69 int sysctl_x25_forward                 = 0;
  70
  71 HLIST_HEAD(x25_list);
  72 DEFINE_RWLOCK(x25_list_lock);
  73
  74 static const struct proto_ops x25_proto_ops;
  75
  76 static struct x25_address null_x25_address = {"               "};
  77
  78 #ifdef CONFIG_COMPAT
  79 struct compat_x25_subscrip_struct {
  80         char device[200-sizeof(compat_ulong_t)];
  81         compat_ulong_t global_facil_mask;
  82         compat_uint_t extended;
  83 };
  84 #endif
  85
  86
  87 int x25_parse_address_block(struct sk_buff *skb,
  88                 struct x25_address *called_addr,
  89                 struct x25_address *calling_addr)
  90 {
  91         unsigned char len;
  92         int needed;
  93         int rc;
  94
  95         if (skb->len < 1) {
  96                 /* packet has no address block */
  97                 rc = 0;
  98                 goto empty;
  99         }
 100
 101         len = *skb->data;
 102         needed = 1 + (len >> 4) + (len & 0x0f);
 103
 104         if (skb->len < needed) {
 105                 /* packet is too short to hold the addresses it claims
 106                    to hold */
 107                 rc = -1;
 108                 goto empty;
 109         }
 110
 111         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 112
 113 empty:
 114         *called_addr->x25_addr = 0;
 115         *calling_addr->x25_addr = 0;
 116
 117         return rc;
 118 }
 119
 120
 121 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 122                   struct x25_address *calling_addr)
 123 {
 124         unsigned int called_len, calling_len;
 125         char *called, *calling;
 126         unsigned int i;
 127
 128         called_len  = (*p >> 0) & 0x0F;
 129         calling_len = (*p >> 4) & 0x0F;
 130
 131         called  = called_addr->x25_addr;
 132         calling = calling_addr->x25_addr;
 133         p++;
 134
 135         for (i = 0; i < (called_len + calling_len); i++) {
 136                 if (i < called_len) {
 137                         if (i % 2 != 0) {
 138                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 139                                 p++;
 140                         } else {
 141                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 142                         }
 143                 } else {
 144                         if (i % 2 != 0) {
 145                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 146                                 p++;
 147                         } else {
 148                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 149                         }
 150                 }
 151         }
 152
 153         *called = *calling = '\0';
 154
 155         return 1 + (called_len + calling_len + 1) / 2;
 156 }
 157
 158 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 159                   struct x25_address *calling_addr)
 160 {
 161         unsigned int called_len, calling_len;
 162         char *called, *calling;
 163         int i;
 164
 165         called  = called_addr->x25_addr;
 166         calling = calling_addr->x25_addr;
 167
 168         called_len  = strlen(called);
 169         calling_len = strlen(calling);
 170
 171         *p++ = (calling_len << 4) | (called_len << 0);
 172
 173         for (i = 0; i < (called_len + calling_len); i++) {
 174                 if (i < called_len) {
 175                         if (i % 2 != 0) {
 176                                 *p |= (*called++ - '0') << 0;
 177                                 p++;
 178                         } else {
 179                                 *p = 0x00;
 180                                 *p |= (*called++ - '0') << 4;
 181                         }
 182                 } else {
 183                         if (i % 2 != 0) {
 184                                 *p |= (*calling++ - '0') << 0;
 185                                 p++;
 186                         } else {
 187                                 *p = 0x00;
 188                                 *p |= (*calling++ - '0') << 4;
 189                         }
 190                 }
 191         }
 192
 193         return 1 + (called_len + calling_len + 1) / 2;
 194 }
 195
 196 /*
 197  *      Socket removal during an interrupt is now safe.
 198  */
 199 static void x25_remove_socket(struct sock *sk)
 200 {
 201         write_lock_bh(&x25_list_lock);
 202         sk_del_node_init(sk);
 203         write_unlock_bh(&x25_list_lock);
 204 }
 205
 206 /*
 207  *      Kill all bound sockets on a dropped device.
 208  */
 209 static void x25_kill_by_device(struct net_device *dev)
 210 {
 211         struct sock *s;
 212         struct hlist_node *node;
 213
 214         write_lock_bh(&x25_list_lock);
 215
 216         sk_for_each(s, node, &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 = 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 defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
 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         struct hlist_node *node;
 285
 286         read_lock_bh(&x25_list_lock);
 287         next_best = NULL;
 288
 289         sk_for_each(s, node, &x25_list)
 290                 if ((!strcmp(addr->x25_addr,
 291                         x25_sk(s)->source_addr.x25_addr) ||
 292                                 !strcmp(addr->x25_addr,
 293                                         null_x25_address.x25_addr)) &&
 294                                         s->sk_state == TCP_LISTEN) {
 295                         /*
 296                          * Found a listening socket, now check the incoming
 297                          * call user data vs this sockets call user data
 298                          */
 299                         if(skb->len > 0 && x25_sk(s)->cudmatchlength > 0) {
 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         struct hlist_node *node;
 327
 328         sk_for_each(s, node, &x25_list)
 329                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 330                         sock_hold(s);
 331                         goto found;
 332                 }
 333         s = NULL;
 334 found:
 335         return s;
 336 }
 337
 338 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 339 {
 340         struct sock *s;
 341
 342         read_lock_bh(&x25_list_lock);
 343         s = __x25_find_socket(lci, nb);
 344         read_unlock_bh(&x25_list_lock);
 345         return s;
 346 }
 347
 348 /*
 349  *      Find a unique LCI for a given device.
 350  */
 351 static unsigned int x25_new_lci(struct x25_neigh *nb)
 352 {
 353         unsigned int lci = 1;
 354         struct sock *sk;
 355
 356         read_lock_bh(&x25_list_lock);
 357
 358         while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 359                 sock_put(sk);
 360                 if (++lci == 4096) {
 361                         lci = 0;
 362                         break;
 363                 }
 364         }
 365
 366         read_unlock_bh(&x25_list_lock);
 367         return lci;
 368 }
 369
 370 /*
 371  *      Deferred destroy.
 372  */
 373 static void __x25_destroy_socket(struct sock *);
 374
 375 /*
 376  *      handler for deferred kills.
 377  */
 378 static void x25_destroy_timer(unsigned long data)
 379 {
 380         x25_destroy_socket_from_timer((struct sock *)data);
 381 }
 382
 383 /*
 384  *      This is called from user mode and the timers. Thus it protects itself
 385  *      against interrupt users but doesn't worry about being called during
 386  *      work. Once it is removed from the queue no interrupt or bottom half
 387  *      will touch it and we are (fairly 8-) ) safe.
 388  *      Not static as it's used by the timer
 389  */
 390 static void __x25_destroy_socket(struct sock *sk)
 391 {
 392         struct sk_buff *skb;
 393
 394         x25_stop_heartbeat(sk);
 395         x25_stop_timer(sk);
 396
 397         x25_remove_socket(sk);
 398         x25_clear_queues(sk);           /* Flush the queues */
 399
 400         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 401                 if (skb->sk != sk) {            /* A pending connection */
 402                         /*
 403                          * Queue the unaccepted socket for death
 404                          */
 405                         skb->sk->sk_state = TCP_LISTEN;
 406                         sock_set_flag(skb->sk, SOCK_DEAD);
 407                         x25_start_heartbeat(skb->sk);
 408                         x25_sk(skb->sk)->state = X25_STATE_0;
 409                 }
 410
 411                 kfree_skb(skb);
 412         }
 413
 414         if (sk_has_allocations(sk)) {
 415                 /* Defer: outstanding buffers */
 416                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 417                 sk->sk_timer.function = x25_destroy_timer;
 418                 sk->sk_timer.data = (unsigned long)sk;
 419                 add_timer(&sk->sk_timer);
 420         } else {
 421                 /* drop last reference so sock_put will free */
 422                 __sock_put(sk);
 423         }
 424 }
 425
 426 void x25_destroy_socket_from_timer(struct sock *sk)
 427 {
 428         sock_hold(sk);
 429         bh_lock_sock(sk);
 430         __x25_destroy_socket(sk);
 431         bh_unlock_sock(sk);
 432         sock_put(sk);
 433 }
 434
 435 static void x25_destroy_socket(struct sock *sk)
 436 {
 437         sock_hold(sk);
 438         lock_sock(sk);
 439         __x25_destroy_socket(sk);
 440         release_sock(sk);
 441         sock_put(sk);
 442 }
 443
 444 /*
 445  *      Handling for system calls applied via the various interfaces to a
 446  *      X.25 socket object.
 447  */
 448
 449 static int x25_setsockopt(struct socket *sock, int level, int optname,
 450                           char __user *optval, unsigned int optlen)
 451 {
 452         int opt;
 453         struct sock *sk = sock->sk;
 454         int rc = -ENOPROTOOPT;
 455
 456         lock_kernel();
 457         if (level != SOL_X25 || optname != X25_QBITINCL)
 458                 goto out;
 459
 460         rc = -EINVAL;
 461         if (optlen < sizeof(int))
 462                 goto out;
 463
 464         rc = -EFAULT;
 465         if (get_user(opt, (int __user *)optval))
 466                 goto out;
 467
 468         if (opt)
 469                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 470         else
 471                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 472         rc = 0;
 473 out:
 474         unlock_kernel();
 475         return rc;
 476 }
 477
 478 static int x25_getsockopt(struct socket *sock, int level, int optname,
 479                           char __user *optval, int __user *optlen)
 480 {
 481         struct sock *sk = sock->sk;
 482         int val, len, rc = -ENOPROTOOPT;
 483
 484         lock_kernel();
 485         if (level != SOL_X25 || optname != X25_QBITINCL)
 486                 goto out;
 487
 488         rc = -EFAULT;
 489         if (get_user(len, optlen))
 490                 goto out;
 491
 492         len = min_t(unsigned int, len, sizeof(int));
 493
 494         rc = -EINVAL;
 495         if (len < 0)
 496                 goto out;
 497
 498         rc = -EFAULT;
 499         if (put_user(len, optlen))
 500                 goto out;
 501
 502         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 503         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 504 out:
 505         unlock_kernel();
 506         return rc;
 507 }
 508
 509 static int x25_listen(struct socket *sock, int backlog)
 510 {
 511         struct sock *sk = sock->sk;
 512         int rc = -EOPNOTSUPP;
 513
 514         lock_kernel();
 515         if (sk->sk_state != TCP_LISTEN) {
 516                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 517                 sk->sk_max_ack_backlog = backlog;
 518                 sk->sk_state           = TCP_LISTEN;
 519                 rc = 0;
 520         }
 521         unlock_kernel();
 522
 523         return rc;
 524 }
 525
 526 static struct proto x25_proto = {
 527         .name     = "X25",
 528         .owner    = THIS_MODULE,
 529         .obj_size = sizeof(struct x25_sock),
 530 };
 531
 532 static struct sock *x25_alloc_socket(struct net *net)
 533 {
 534         struct x25_sock *x25;
 535         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 536
 537         if (!sk)
 538                 goto out;
 539
 540         sock_init_data(NULL, sk);
 541
 542         x25 = x25_sk(sk);
 543         skb_queue_head_init(&x25->ack_queue);
 544         skb_queue_head_init(&x25->fragment_queue);
 545         skb_queue_head_init(&x25->interrupt_in_queue);
 546         skb_queue_head_init(&x25->interrupt_out_queue);
 547 out:
 548         return sk;
 549 }
 550
 551 static int x25_create(struct net *net, struct socket *sock, int protocol,
 552                       int kern)
 553 {
 554         struct sock *sk;
 555         struct x25_sock *x25;
 556         int rc = -EAFNOSUPPORT;
 557
 558         if (!net_eq(net, &init_net))
 559                 goto out;
 560
 561         rc = -ESOCKTNOSUPPORT;
 562         if (sock->type != SOCK_SEQPACKET)
 563                 goto out;
 564
 565         rc = -EINVAL;
 566         if (protocol)
 567                 goto out;
 568
 569         rc = -ENOBUFS;
 570         if ((sk = x25_alloc_socket(net)) == NULL)
 571                 goto out;
 572
 573         x25 = x25_sk(sk);
 574
 575         sock_init_data(sock, sk);
 576
 577         x25_init_timers(sk);
 578
 579         sock->ops    = &x25_proto_ops;
 580         sk->sk_protocol = protocol;
 581         sk->sk_backlog_rcv = x25_backlog_rcv;
 582
 583         x25->t21   = sysctl_x25_call_request_timeout;
 584         x25->t22   = sysctl_x25_reset_request_timeout;
 585         x25->t23   = sysctl_x25_clear_request_timeout;
 586         x25->t2    = sysctl_x25_ack_holdback_timeout;
 587         x25->state = X25_STATE_0;
 588         x25->cudmatchlength = 0;
 589         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 590                                                         /* on call accept   */
 591
 592         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 593         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 594         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 595         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 596         x25->facilities.throughput  = 0;        /* by default don't negotiate
 597                                                    throughput */
 598         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 599         x25->dte_facilities.calling_len = 0;
 600         x25->dte_facilities.called_len = 0;
 601         memset(x25->dte_facilities.called_ae, '\0',
 602                         sizeof(x25->dte_facilities.called_ae));
 603         memset(x25->dte_facilities.calling_ae, '\0',
 604                         sizeof(x25->dte_facilities.calling_ae));
 605
 606         rc = 0;
 607 out:
 608         return rc;
 609 }
 610
 611 static struct sock *x25_make_new(struct sock *osk)
 612 {
 613         struct sock *sk = NULL;
 614         struct x25_sock *x25, *ox25;
 615
 616         if (osk->sk_type != SOCK_SEQPACKET)
 617                 goto out;
 618
 619         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 620                 goto out;
 621
 622         x25 = x25_sk(sk);
 623
 624         sk->sk_type        = osk->sk_type;
 625         sk->sk_priority    = osk->sk_priority;
 626         sk->sk_protocol    = osk->sk_protocol;
 627         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 628         sk->sk_sndbuf      = osk->sk_sndbuf;
 629         sk->sk_state       = TCP_ESTABLISHED;
 630         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 631         sock_copy_flags(sk, osk);
 632
 633         ox25 = x25_sk(osk);
 634         x25->t21        = ox25->t21;
 635         x25->t22        = ox25->t22;
 636         x25->t23        = ox25->t23;
 637         x25->t2         = ox25->t2;
 638         x25->flags      = ox25->flags;
 639         x25->facilities = ox25->facilities;
 640         x25->dte_facilities = ox25->dte_facilities;
 641         x25->cudmatchlength = ox25->cudmatchlength;
 642
 643         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 644         x25_init_timers(sk);
 645 out:
 646         return sk;
 647 }
 648
 649 static int x25_release(struct socket *sock)
 650 {
 651         struct sock *sk = sock->sk;
 652         struct x25_sock *x25;
 653
 654         lock_kernel();
 655         if (!sk)
 656                 goto out;
 657
 658         x25 = x25_sk(sk);
 659
 660         switch (x25->state) {
 661
 662                 case X25_STATE_0:
 663                 case X25_STATE_2:
 664                         x25_disconnect(sk, 0, 0, 0);
 665                         x25_destroy_socket(sk);
 666                         goto out;
 667
 668                 case X25_STATE_1:
 669                 case X25_STATE_3:
 670                 case X25_STATE_4:
 671                         x25_clear_queues(sk);
 672                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 673                         x25_start_t23timer(sk);
 674                         x25->state = X25_STATE_2;
 675                         sk->sk_state    = TCP_CLOSE;
 676                         sk->sk_shutdown |= SEND_SHUTDOWN;
 677                         sk->sk_state_change(sk);
 678                         sock_set_flag(sk, SOCK_DEAD);
 679                         sock_set_flag(sk, SOCK_DESTROY);
 680                         break;
 681         }
 682
 683         sock_orphan(sk);
 684 out:
 685         unlock_kernel();
 686         return 0;
 687 }
 688
 689 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 690 {
 691         struct sock *sk = sock->sk;
 692         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 693         int len, i, rc = 0;
 694
 695         lock_kernel();
 696         if (!sock_flag(sk, SOCK_ZAPPED) ||
 697             addr_len != sizeof(struct sockaddr_x25) ||
 698             addr->sx25_family != AF_X25) {
 699                 rc = -EINVAL;
 700                 goto out;
 701         }
 702
 703         len = strlen(addr->sx25_addr.x25_addr);
 704         for (i = 0; i < len; i++) {
 705                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 706                         rc = -EINVAL;
 707                         goto out;
 708                 }
 709         }
 710
 711         x25_sk(sk)->source_addr = addr->sx25_addr;
 712         x25_insert_socket(sk);
 713         sock_reset_flag(sk, SOCK_ZAPPED);
 714         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 715 out:
 716         unlock_kernel();
 717         return rc;
 718 }
 719
 720 static int x25_wait_for_connection_establishment(struct sock *sk)
 721 {
 722         DECLARE_WAITQUEUE(wait, current);
 723         int rc;
 724
 725         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 726         for (;;) {
 727                 __set_current_state(TASK_INTERRUPTIBLE);
 728                 rc = -ERESTARTSYS;
 729                 if (signal_pending(current))
 730                         break;
 731                 rc = sock_error(sk);
 732                 if (rc) {
 733                         sk->sk_socket->state = SS_UNCONNECTED;
 734                         break;
 735                 }
 736                 rc = 0;
 737                 if (sk->sk_state != TCP_ESTABLISHED) {
 738                         release_sock(sk);
 739                         schedule();
 740                         lock_sock(sk);
 741                 } else
 742                         break;
 743         }
 744         __set_current_state(TASK_RUNNING);
 745         remove_wait_queue(sk_sleep(sk), &wait);
 746         return rc;
 747 }
 748
 749 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 750                        int addr_len, int flags)
 751 {
 752         struct sock *sk = sock->sk;
 753         struct x25_sock *x25 = x25_sk(sk);
 754         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 755         struct x25_route *rt;
 756         int rc = 0;
 757
 758         lock_kernel();
 759         lock_sock(sk);
 760         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 761                 sock->state = SS_CONNECTED;
 762                 goto out; /* Connect completed during a ERESTARTSYS event */
 763         }
 764
 765         rc = -ECONNREFUSED;
 766         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 767                 sock->state = SS_UNCONNECTED;
 768                 goto out;
 769         }
 770
 771         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 772         if (sk->sk_state == TCP_ESTABLISHED)
 773                 goto out;
 774
 775         sk->sk_state   = TCP_CLOSE;
 776         sock->state = SS_UNCONNECTED;
 777
 778         rc = -EINVAL;
 779         if (addr_len != sizeof(struct sockaddr_x25) ||
 780             addr->sx25_family != AF_X25)
 781                 goto out;
 782
 783         rc = -ENETUNREACH;
 784         rt = x25_get_route(&addr->sx25_addr);
 785         if (!rt)
 786                 goto out;
 787
 788         x25->neighbour = x25_get_neigh(rt->dev);
 789         if (!x25->neighbour)
 790                 goto out_put_route;
 791
 792         x25_limit_facilities(&x25->facilities, x25->neighbour);
 793
 794         x25->lci = x25_new_lci(x25->neighbour);
 795         if (!x25->lci)
 796                 goto out_put_neigh;
 797
 798         rc = -EINVAL;
 799         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 800                 goto out_put_neigh;
 801
 802         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 803                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 804
 805         x25->dest_addr = addr->sx25_addr;
 806
 807         /* Move to connecting socket, start sending Connect Requests */
 808         sock->state   = SS_CONNECTING;
 809         sk->sk_state  = TCP_SYN_SENT;
 810
 811         x25->state = X25_STATE_1;
 812
 813         x25_write_internal(sk, X25_CALL_REQUEST);
 814
 815         x25_start_heartbeat(sk);
 816         x25_start_t21timer(sk);
 817
 818         /* Now the loop */
 819         rc = -EINPROGRESS;
 820         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 821                 goto out_put_neigh;
 822
 823         rc = x25_wait_for_connection_establishment(sk);
 824         if (rc)
 825                 goto out_put_neigh;
 826
 827         sock->state = SS_CONNECTED;
 828         rc = 0;
 829 out_put_neigh:
 830         if (rc)
 831                 x25_neigh_put(x25->neighbour);
 832 out_put_route:
 833         x25_route_put(rt);
 834 out:
 835         release_sock(sk);
 836         unlock_kernel();
 837         return rc;
 838 }
 839
 840 static int x25_wait_for_data(struct sock *sk, long timeout)
 841 {
 842         DECLARE_WAITQUEUE(wait, current);
 843         int rc = 0;
 844
 845         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 846         for (;;) {
 847                 __set_current_state(TASK_INTERRUPTIBLE);
 848                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 849                         break;
 850                 rc = -ERESTARTSYS;
 851                 if (signal_pending(current))
 852                         break;
 853                 rc = -EAGAIN;
 854                 if (!timeout)
 855                         break;
 856                 rc = 0;
 857                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 858                         release_sock(sk);
 859                         timeout = schedule_timeout(timeout);
 860                         lock_sock(sk);
 861                 } else
 862                         break;
 863         }
 864         __set_current_state(TASK_RUNNING);
 865         remove_wait_queue(sk_sleep(sk), &wait);
 866         return rc;
 867 }
 868
 869 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 870 {
 871         struct sock *sk = sock->sk;
 872         struct sock *newsk;
 873         struct sk_buff *skb;
 874         int rc = -EINVAL;
 875
 876         lock_kernel();
 877         if (!sk || sk->sk_state != TCP_LISTEN)
 878                 goto out;
 879
 880         rc = -EOPNOTSUPP;
 881         if (sk->sk_type != SOCK_SEQPACKET)
 882                 goto out;
 883
 884         lock_sock(sk);
 885         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 886         if (rc)
 887                 goto out2;
 888         skb = skb_dequeue(&sk->sk_receive_queue);
 889         rc = -EINVAL;
 890         if (!skb->sk)
 891                 goto out2;
 892         newsk            = skb->sk;
 893         sock_graft(newsk, newsock);
 894
 895         /* Now attach up the new socket */
 896         skb->sk = NULL;
 897         kfree_skb(skb);
 898         sk->sk_ack_backlog--;
 899         newsock->state = SS_CONNECTED;
 900         rc = 0;
 901 out2:
 902         release_sock(sk);
 903 out:
 904         unlock_kernel();
 905         return rc;
 906 }
 907
 908 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 909                        int *uaddr_len, int peer)
 910 {
 911         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 912         struct sock *sk = sock->sk;
 913         struct x25_sock *x25 = x25_sk(sk);
 914         int rc = 0;
 915
 916         lock_kernel();
 917         if (peer) {
 918                 if (sk->sk_state != TCP_ESTABLISHED) {
 919                         rc = -ENOTCONN;
 920                         goto out;
 921                 }
 922                 sx25->sx25_addr = x25->dest_addr;
 923         } else
 924                 sx25->sx25_addr = x25->source_addr;
 925
 926         sx25->sx25_family = AF_X25;
 927         *uaddr_len = sizeof(*sx25);
 928
 929 out:
 930         unlock_kernel();
 931         return rc;
 932 }
 933
 934 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
 935                            poll_table *wait)
 936 {
 937         int rc;
 938
 939         lock_kernel();
 940         rc = datagram_poll(file, sock, wait);
 941         unlock_kernel();
 942
 943         return rc;
 944 }
 945
 946 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 947                         unsigned int lci)
 948 {
 949         struct sock *sk;
 950         struct sock *make;
 951         struct x25_sock *makex25;
 952         struct x25_address source_addr, dest_addr;
 953         struct x25_facilities facilities;
 954         struct x25_dte_facilities dte_facilities;
 955         int len, addr_len, rc;
 956
 957         /*
 958          *      Remove the LCI and frame type.
 959          */
 960         skb_pull(skb, X25_STD_MIN_LEN);
 961
 962         /*
 963          *      Extract the X.25 addresses and convert them to ASCII strings,
 964          *      and remove them.
 965          *
 966          *      Address block is mandatory in call request packets
 967          */
 968         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 969         if (addr_len <= 0)
 970                 goto out_clear_request;
 971         skb_pull(skb, addr_len);
 972
 973         /*
 974          *      Get the length of the facilities, skip past them for the moment
 975          *      get the call user data because this is needed to determine
 976          *      the correct listener
 977          *
 978          *      Facilities length is mandatory in call request packets
 979          */
 980         if (skb->len < 1)
 981                 goto out_clear_request;
 982         len = skb->data[0] + 1;
 983         if (skb->len < len)
 984                 goto out_clear_request;
 985         skb_pull(skb,len);
 986
 987         /*
 988          *      Find a listener for the particular address/cud pair.
 989          */
 990         sk = x25_find_listener(&source_addr,skb);
 991         skb_push(skb,len);
 992
 993         if (sk != NULL && sk_acceptq_is_full(sk)) {
 994                 goto out_sock_put;
 995         }
 996
 997         /*
 998          *      We dont have any listeners for this incoming call.
 999          *      Try forwarding it.
1000          */
1001         if (sk == NULL) {
1002                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1003                 if (sysctl_x25_forward &&
1004                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1005                 {
1006                         /* Call was forwarded, dont process it any more */
1007                         kfree_skb(skb);
1008                         rc = 1;
1009                         goto out;
1010                 } else {
1011                         /* No listeners, can't forward, clear the call */
1012                         goto out_clear_request;
1013                 }
1014         }
1015
1016         /*
1017          *      Try to reach a compromise on the requested facilities.
1018          */
1019         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1020         if (len == -1)
1021                 goto out_sock_put;
1022
1023         /*
1024          * current neighbour/link might impose additional limits
1025          * on certain facilties
1026          */
1027
1028         x25_limit_facilities(&facilities, nb);
1029
1030         /*
1031          *      Try to create a new socket.
1032          */
1033         make = x25_make_new(sk);
1034         if (!make)
1035                 goto out_sock_put;
1036
1037         /*
1038          *      Remove the facilities
1039          */
1040         skb_pull(skb, len);
1041
1042         skb->sk     = make;
1043         make->sk_state = TCP_ESTABLISHED;
1044
1045         makex25 = x25_sk(make);
1046         makex25->lci           = lci;
1047         makex25->dest_addr     = dest_addr;
1048         makex25->source_addr   = source_addr;
1049         makex25->neighbour     = nb;
1050         makex25->facilities    = facilities;
1051         makex25->dte_facilities= dte_facilities;
1052         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1053         /* ensure no reverse facil on accept */
1054         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1055         /* ensure no calling address extension on accept */
1056         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1057         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1058
1059         /* Normally all calls are accepted immediately */
1060         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1061                 x25_write_internal(make, X25_CALL_ACCEPTED);
1062                 makex25->state = X25_STATE_3;
1063         }
1064
1065         /*
1066          *      Incoming Call User Data.
1067          */
1068         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1069         makex25->calluserdata.cudlength = skb->len;
1070
1071         sk->sk_ack_backlog++;
1072
1073         x25_insert_socket(make);
1074
1075         skb_queue_head(&sk->sk_receive_queue, skb);
1076
1077         x25_start_heartbeat(make);
1078
1079         if (!sock_flag(sk, SOCK_DEAD))
1080                 sk->sk_data_ready(sk, skb->len);
1081         rc = 1;
1082         sock_put(sk);
1083 out:
1084         return rc;
1085 out_sock_put:
1086         sock_put(sk);
1087 out_clear_request:
1088         rc = 0;
1089         x25_transmit_clear_request(nb, lci, 0x01);
1090         goto out;
1091 }
1092
1093 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1094                        struct msghdr *msg, size_t len)
1095 {
1096         struct sock *sk = sock->sk;
1097         struct x25_sock *x25 = x25_sk(sk);
1098         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1099         struct sockaddr_x25 sx25;
1100         struct sk_buff *skb;
1101         unsigned char *asmptr;
1102         int noblock = msg->msg_flags & MSG_DONTWAIT;
1103         size_t size;
1104         int qbit = 0, rc = -EINVAL;
1105
1106         lock_kernel();
1107         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1108                 goto out;
1109
1110         /* we currently don't support segmented records at the user interface */
1111         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1112                 goto out;
1113
1114         rc = -EADDRNOTAVAIL;
1115         if (sock_flag(sk, SOCK_ZAPPED))
1116                 goto out;
1117
1118         rc = -EPIPE;
1119         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1120                 send_sig(SIGPIPE, current, 0);
1121                 goto out;
1122         }
1123
1124         rc = -ENETUNREACH;
1125         if (!x25->neighbour)
1126                 goto out;
1127
1128         if (usx25) {
1129                 rc = -EINVAL;
1130                 if (msg->msg_namelen < sizeof(sx25))
1131                         goto out;
1132                 memcpy(&sx25, usx25, sizeof(sx25));
1133                 rc = -EISCONN;
1134                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1135                         goto out;
1136                 rc = -EINVAL;
1137                 if (sx25.sx25_family != AF_X25)
1138                         goto out;
1139         } else {
1140                 /*
1141                  *      FIXME 1003.1g - if the socket is like this because
1142                  *      it has become closed (not started closed) we ought
1143                  *      to SIGPIPE, EPIPE;
1144                  */
1145                 rc = -ENOTCONN;
1146                 if (sk->sk_state != TCP_ESTABLISHED)
1147                         goto out;
1148
1149                 sx25.sx25_family = AF_X25;
1150                 sx25.sx25_addr   = x25->dest_addr;
1151         }
1152
1153         /* Sanity check the packet size */
1154         if (len > 65535) {
1155                 rc = -EMSGSIZE;
1156                 goto out;
1157         }
1158
1159         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1160
1161         /* Build a packet */
1162         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1163
1164         if ((msg->msg_flags & MSG_OOB) && len > 32)
1165                 len = 32;
1166
1167         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1168
1169         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1170         if (!skb)
1171                 goto out;
1172         X25_SKB_CB(skb)->flags = msg->msg_flags;
1173
1174         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1175
1176         /*
1177          *      Put the data on the end
1178          */
1179         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1180
1181         skb_reset_transport_header(skb);
1182         skb_put(skb, len);
1183
1184         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1185         if (rc)
1186                 goto out_kfree_skb;
1187
1188         /*
1189          *      If the Q BIT Include socket option is in force, the first
1190          *      byte of the user data is the logical value of the Q Bit.
1191          */
1192         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1193                 qbit = skb->data[0];
1194                 skb_pull(skb, 1);
1195         }
1196
1197         /*
1198          *      Push down the X.25 header
1199          */
1200         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1201
1202         if (msg->msg_flags & MSG_OOB) {
1203                 if (x25->neighbour->extended) {
1204                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1205                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1206                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1207                         *asmptr++ = X25_INTERRUPT;
1208                 } else {
1209                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1210                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1211                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1212                         *asmptr++ = X25_INTERRUPT;
1213                 }
1214         } else {
1215                 if (x25->neighbour->extended) {
1216                         /* Build an Extended X.25 header */
1217                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1218                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1219                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1220                         *asmptr++ = X25_DATA;
1221                         *asmptr++ = X25_DATA;
1222                 } else {
1223                         /* Build an Standard X.25 header */
1224                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1225                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1226                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1227                         *asmptr++ = X25_DATA;
1228                 }
1229
1230                 if (qbit)
1231                         skb->data[0] |= X25_Q_BIT;
1232         }
1233
1234         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1235         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1236
1237         rc = -ENOTCONN;
1238         if (sk->sk_state != TCP_ESTABLISHED)
1239                 goto out_kfree_skb;
1240
1241         if (msg->msg_flags & MSG_OOB)
1242                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1243         else {
1244                 rc = x25_output(sk, skb);
1245                 len = rc;
1246                 if (rc < 0)
1247                         kfree_skb(skb);
1248                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1249                         len++;
1250         }
1251
1252         /*
1253          * lock_sock() is currently only used to serialize this x25_kick()
1254          * against input-driven x25_kick() calls. It currently only blocks
1255          * incoming packets for this socket and does not protect against
1256          * any other socket state changes and is not called from anywhere
1257          * else. As x25_kick() cannot block and as long as all socket
1258          * operations are BKL-wrapped, we don't need take to care about
1259          * purging the backlog queue in x25_release().
1260          *
1261          * Using lock_sock() to protect all socket operations entirely
1262          * (and making the whole x25 stack SMP aware) unfortunately would
1263          * require major changes to {send,recv}msg and skb allocation methods.
1264          * -> 2.5 ;)
1265          */
1266         lock_sock(sk);
1267         x25_kick(sk);
1268         release_sock(sk);
1269         rc = len;
1270 out:
1271         unlock_kernel();
1272         return rc;
1273 out_kfree_skb:
1274         kfree_skb(skb);
1275         goto out;
1276 }
1277
1278
1279 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1280                        struct msghdr *msg, size_t size,
1281                        int flags)
1282 {
1283         struct sock *sk = sock->sk;
1284         struct x25_sock *x25 = x25_sk(sk);
1285         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1286         size_t copied;
1287         int qbit;
1288         struct sk_buff *skb;
1289         unsigned char *asmptr;
1290         int rc = -ENOTCONN;
1291
1292         lock_kernel();
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                 skb_pull(skb, X25_STD_MIN_LEN);
1309
1310                 /*
1311                  *      No Q bit information on Interrupt data.
1312                  */
1313                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1314                         asmptr  = skb_push(skb, 1);
1315                         *asmptr = 0x00;
1316                 }
1317
1318                 msg->msg_flags |= MSG_OOB;
1319         } else {
1320                 /* Now we can treat all alike */
1321                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1322                                         flags & MSG_DONTWAIT, &rc);
1323                 if (!skb)
1324                         goto out;
1325
1326                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1327
1328                 skb_pull(skb, x25->neighbour->extended ?
1329                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1330
1331                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1332                         asmptr  = skb_push(skb, 1);
1333                         *asmptr = qbit;
1334                 }
1335         }
1336
1337         skb_reset_transport_header(skb);
1338         copied = skb->len;
1339
1340         if (copied > size) {
1341                 copied = size;
1342                 msg->msg_flags |= MSG_TRUNC;
1343         }
1344
1345         /* Currently, each datagram always contains a complete record */
1346         msg->msg_flags |= MSG_EOR;
1347
1348         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1349         if (rc)
1350                 goto out_free_dgram;
1351
1352         if (sx25) {
1353                 sx25->sx25_family = AF_X25;
1354                 sx25->sx25_addr   = x25->dest_addr;
1355         }
1356
1357         msg->msg_namelen = sizeof(struct sockaddr_x25);
1358
1359         lock_sock(sk);
1360         x25_check_rbuf(sk);
1361         release_sock(sk);
1362         rc = copied;
1363 out_free_dgram:
1364         skb_free_datagram(sk, skb);
1365 out:
1366         unlock_kernel();
1367         return rc;
1368 }
1369
1370
1371 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1372 {
1373         struct sock *sk = sock->sk;
1374         struct x25_sock *x25 = x25_sk(sk);
1375         void __user *argp = (void __user *)arg;
1376         int rc;
1377
1378         lock_kernel();
1379         switch (cmd) {
1380                 case TIOCOUTQ: {
1381                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1382
1383                         if (amount < 0)
1384                                 amount = 0;
1385                         rc = put_user(amount, (unsigned int __user *)argp);
1386                         break;
1387                 }
1388
1389                 case TIOCINQ: {
1390                         struct sk_buff *skb;
1391                         int amount = 0;
1392                         /*
1393                          * These two are safe on a single CPU system as
1394                          * only user tasks fiddle here
1395                          */
1396                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1397                                 amount = skb->len;
1398                         rc = put_user(amount, (unsigned int __user *)argp);
1399                         break;
1400                 }
1401
1402                 case SIOCGSTAMP:
1403                         rc = -EINVAL;
1404                         if (sk)
1405                                 rc = sock_get_timestamp(sk,
1406                                                 (struct timeval __user *)argp);
1407                         break;
1408                 case SIOCGSTAMPNS:
1409                         rc = -EINVAL;
1410                         if (sk)
1411                                 rc = sock_get_timestampns(sk,
1412                                                 (struct timespec __user *)argp);
1413                         break;
1414                 case SIOCGIFADDR:
1415                 case SIOCSIFADDR:
1416                 case SIOCGIFDSTADDR:
1417                 case SIOCSIFDSTADDR:
1418                 case SIOCGIFBRDADDR:
1419                 case SIOCSIFBRDADDR:
1420                 case SIOCGIFNETMASK:
1421                 case SIOCSIFNETMASK:
1422                 case SIOCGIFMETRIC:
1423                 case SIOCSIFMETRIC:
1424                         rc = -EINVAL;
1425                         break;
1426                 case SIOCADDRT:
1427                 case SIOCDELRT:
1428                         rc = -EPERM;
1429                         if (!capable(CAP_NET_ADMIN))
1430                                 break;
1431                         rc = x25_route_ioctl(cmd, argp);
1432                         break;
1433                 case SIOCX25GSUBSCRIP:
1434                         rc = x25_subscr_ioctl(cmd, argp);
1435                         break;
1436                 case SIOCX25SSUBSCRIP:
1437                         rc = -EPERM;
1438                         if (!capable(CAP_NET_ADMIN))
1439                                 break;
1440                         rc = x25_subscr_ioctl(cmd, argp);
1441                         break;
1442                 case SIOCX25GFACILITIES: {
1443                         struct x25_facilities fac = x25->facilities;
1444                         rc = copy_to_user(argp, &fac,
1445                                           sizeof(fac)) ? -EFAULT : 0;
1446                         break;
1447                 }
1448
1449                 case SIOCX25SFACILITIES: {
1450                         struct x25_facilities facilities;
1451                         rc = -EFAULT;
1452                         if (copy_from_user(&facilities, argp,
1453                                            sizeof(facilities)))
1454                                 break;
1455                         rc = -EINVAL;
1456                         if (sk->sk_state != TCP_LISTEN &&
1457                             sk->sk_state != TCP_CLOSE)
1458                                 break;
1459                         if (facilities.pacsize_in < X25_PS16 ||
1460                             facilities.pacsize_in > X25_PS4096)
1461                                 break;
1462                         if (facilities.pacsize_out < X25_PS16 ||
1463                             facilities.pacsize_out > X25_PS4096)
1464                                 break;
1465                         if (facilities.winsize_in < 1 ||
1466                             facilities.winsize_in > 127)
1467                                 break;
1468                         if (facilities.throughput) {
1469                                 int out = facilities.throughput & 0xf0;
1470                                 int in  = facilities.throughput & 0x0f;
1471                                 if (!out)
1472                                         facilities.throughput |=
1473                                                 X25_DEFAULT_THROUGHPUT << 4;
1474                                 else if (out < 0x30 || out > 0xD0)
1475                                         break;
1476                                 if (!in)
1477                                         facilities.throughput |=
1478                                                 X25_DEFAULT_THROUGHPUT;
1479                                 else if (in < 0x03 || in > 0x0D)
1480                                         break;
1481                         }
1482                         if (facilities.reverse &&
1483                                 (facilities.reverse & 0x81) != 0x81)
1484                                 break;
1485                         x25->facilities = facilities;
1486                         rc = 0;
1487                         break;
1488                 }
1489
1490                 case SIOCX25GDTEFACILITIES: {
1491                         rc = copy_to_user(argp, &x25->dte_facilities,
1492                                                 sizeof(x25->dte_facilities));
1493                         if (rc)
1494                                 rc = -EFAULT;
1495                         break;
1496                 }
1497
1498                 case SIOCX25SDTEFACILITIES: {
1499                         struct x25_dte_facilities dtefacs;
1500                         rc = -EFAULT;
1501                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1502                                 break;
1503                         rc = -EINVAL;
1504                         if (sk->sk_state != TCP_LISTEN &&
1505                                         sk->sk_state != TCP_CLOSE)
1506                                 break;
1507                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1508                                 break;
1509                         if (dtefacs.calling_ae == NULL)
1510                                 break;
1511                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1512                                 break;
1513                         if (dtefacs.called_ae == NULL)
1514                                 break;
1515                         x25->dte_facilities = dtefacs;
1516                         rc = 0;
1517                         break;
1518                 }
1519
1520                 case SIOCX25GCALLUSERDATA: {
1521                         struct x25_calluserdata cud = x25->calluserdata;
1522                         rc = copy_to_user(argp, &cud,
1523                                           sizeof(cud)) ? -EFAULT : 0;
1524                         break;
1525                 }
1526
1527                 case SIOCX25SCALLUSERDATA: {
1528                         struct x25_calluserdata calluserdata;
1529
1530                         rc = -EFAULT;
1531                         if (copy_from_user(&calluserdata, argp,
1532                                            sizeof(calluserdata)))
1533                                 break;
1534                         rc = -EINVAL;
1535                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1536                                 break;
1537                         x25->calluserdata = calluserdata;
1538                         rc = 0;
1539                         break;
1540                 }
1541
1542                 case SIOCX25GCAUSEDIAG: {
1543                         struct x25_causediag causediag;
1544                         causediag = x25->causediag;
1545                         rc = copy_to_user(argp, &causediag,
1546                                           sizeof(causediag)) ? -EFAULT : 0;
1547                         break;
1548                 }
1549
1550                 case SIOCX25SCAUSEDIAG: {
1551                         struct x25_causediag causediag;
1552                         rc = -EFAULT;
1553                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1554                                 break;
1555                         x25->causediag = causediag;
1556                         rc = 0;
1557                         break;
1558
1559                 }
1560
1561                 case SIOCX25SCUDMATCHLEN: {
1562                         struct x25_subaddr sub_addr;
1563                         rc = -EINVAL;
1564                         if(sk->sk_state != TCP_CLOSE)
1565                                 break;
1566                         rc = -EFAULT;
1567                         if (copy_from_user(&sub_addr, argp,
1568                                         sizeof(sub_addr)))
1569                                 break;
1570                         rc = -EINVAL;
1571                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1572                                 break;
1573                         x25->cudmatchlength = sub_addr.cudmatchlength;
1574                         rc = 0;
1575                         break;
1576                 }
1577
1578                 case SIOCX25CALLACCPTAPPRV: {
1579                         rc = -EINVAL;
1580                         if (sk->sk_state != TCP_CLOSE)
1581                                 break;
1582                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1583                         rc = 0;
1584                         break;
1585                 }
1586
1587                 case SIOCX25SENDCALLACCPT:  {
1588                         rc = -EINVAL;
1589                         if (sk->sk_state != TCP_ESTABLISHED)
1590                                 break;
1591                         /* must call accptapprv above */
1592                         if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1593                                 break;
1594                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1595                         x25->state = X25_STATE_3;
1596                         rc = 0;
1597                         break;
1598                 }
1599
1600                 default:
1601                         rc = -ENOIOCTLCMD;
1602                         break;
1603         }
1604         unlock_kernel();
1605
1606         return rc;
1607 }
1608
1609 static const struct net_proto_family x25_family_ops = {
1610         .family =       AF_X25,
1611         .create =       x25_create,
1612         .owner  =       THIS_MODULE,
1613 };
1614
1615 #ifdef CONFIG_COMPAT
1616 static int compat_x25_subscr_ioctl(unsigned int cmd,
1617                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1618 {
1619         struct compat_x25_subscrip_struct x25_subscr;
1620         struct x25_neigh *nb;
1621         struct net_device *dev;
1622         int rc = -EINVAL;
1623
1624         rc = -EFAULT;
1625         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1626                 goto out;
1627
1628         rc = -EINVAL;
1629         dev = x25_dev_get(x25_subscr.device);
1630         if (dev == NULL)
1631                 goto out;
1632
1633         nb = x25_get_neigh(dev);
1634         if (nb == NULL)
1635                 goto out_dev_put;
1636
1637         dev_put(dev);
1638
1639         if (cmd == SIOCX25GSUBSCRIP) {
1640                 x25_subscr.extended = nb->extended;
1641                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1642                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1643                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1644         } else {
1645                 rc = -EINVAL;
1646                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1647                         rc = 0;
1648                         nb->extended = x25_subscr.extended;
1649                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1650                 }
1651         }
1652         x25_neigh_put(nb);
1653 out:
1654         return rc;
1655 out_dev_put:
1656         dev_put(dev);
1657         goto out;
1658 }
1659
1660 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1661                                 unsigned long arg)
1662 {
1663         void __user *argp = compat_ptr(arg);
1664         struct sock *sk = sock->sk;
1665
1666         int rc = -ENOIOCTLCMD;
1667
1668         switch(cmd) {
1669         case TIOCOUTQ:
1670         case TIOCINQ:
1671                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1672                 break;
1673         case SIOCGSTAMP:
1674                 rc = -EINVAL;
1675                 lock_kernel();
1676                 if (sk)
1677                         rc = compat_sock_get_timestamp(sk,
1678                                         (struct timeval __user*)argp);
1679                 unlock_kernel();
1680                 break;
1681         case SIOCGSTAMPNS:
1682                 rc = -EINVAL;
1683                 lock_kernel();
1684                 if (sk)
1685                         rc = compat_sock_get_timestampns(sk,
1686                                         (struct timespec __user*)argp);
1687                 unlock_kernel();
1688                 break;
1689         case SIOCGIFADDR:
1690         case SIOCSIFADDR:
1691         case SIOCGIFDSTADDR:
1692         case SIOCSIFDSTADDR:
1693         case SIOCGIFBRDADDR:
1694         case SIOCSIFBRDADDR:
1695         case SIOCGIFNETMASK:
1696         case SIOCSIFNETMASK:
1697         case SIOCGIFMETRIC:
1698         case SIOCSIFMETRIC:
1699                 rc = -EINVAL;
1700                 break;
1701         case SIOCADDRT:
1702         case SIOCDELRT:
1703                 rc = -EPERM;
1704                 if (!capable(CAP_NET_ADMIN))
1705                         break;
1706                 lock_kernel();
1707                 rc = x25_route_ioctl(cmd, argp);
1708                 unlock_kernel();
1709                 break;
1710         case SIOCX25GSUBSCRIP:
1711                 lock_kernel();
1712                 rc = compat_x25_subscr_ioctl(cmd, argp);
1713                 unlock_kernel();
1714                 break;
1715         case SIOCX25SSUBSCRIP:
1716                 rc = -EPERM;
1717                 if (!capable(CAP_NET_ADMIN))
1718                         break;
1719                 lock_kernel();
1720                 rc = compat_x25_subscr_ioctl(cmd, argp);
1721                 unlock_kernel();
1722                 break;
1723         case SIOCX25GFACILITIES:
1724         case SIOCX25SFACILITIES:
1725         case SIOCX25GDTEFACILITIES:
1726         case SIOCX25SDTEFACILITIES:
1727         case SIOCX25GCALLUSERDATA:
1728         case SIOCX25SCALLUSERDATA:
1729         case SIOCX25GCAUSEDIAG:
1730         case SIOCX25SCAUSEDIAG:
1731         case SIOCX25SCUDMATCHLEN:
1732         case SIOCX25CALLACCPTAPPRV:
1733         case SIOCX25SENDCALLACCPT:
1734                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1735                 break;
1736         default:
1737                 rc = -ENOIOCTLCMD;
1738                 break;
1739         }
1740         return rc;
1741 }
1742 #endif
1743
1744 static const struct proto_ops x25_proto_ops = {
1745         .family =       AF_X25,
1746         .owner =        THIS_MODULE,
1747         .release =      x25_release,
1748         .bind =         x25_bind,
1749         .connect =      x25_connect,
1750         .socketpair =   sock_no_socketpair,
1751         .accept =       x25_accept,
1752         .getname =      x25_getname,
1753         .poll =         x25_datagram_poll,
1754         .ioctl =        x25_ioctl,
1755 #ifdef CONFIG_COMPAT
1756         .compat_ioctl = compat_x25_ioctl,
1757 #endif
1758         .listen =       x25_listen,
1759         .shutdown =     sock_no_shutdown,
1760         .setsockopt =   x25_setsockopt,
1761         .getsockopt =   x25_getsockopt,
1762         .sendmsg =      x25_sendmsg,
1763         .recvmsg =      x25_recvmsg,
1764         .mmap =         sock_no_mmap,
1765         .sendpage =     sock_no_sendpage,
1766 };
1767
1768 static struct packet_type x25_packet_type __read_mostly = {
1769         .type = cpu_to_be16(ETH_P_X25),
1770         .func = x25_lapb_receive_frame,
1771 };
1772
1773 static struct notifier_block x25_dev_notifier = {
1774         .notifier_call = x25_device_event,
1775 };
1776
1777 void x25_kill_by_neigh(struct x25_neigh *nb)
1778 {
1779         struct sock *s;
1780         struct hlist_node *node;
1781
1782         write_lock_bh(&x25_list_lock);
1783
1784         sk_for_each(s, node, &x25_list)
1785                 if (x25_sk(s)->neighbour == nb)
1786                         x25_disconnect(s, ENETUNREACH, 0, 0);
1787
1788         write_unlock_bh(&x25_list_lock);
1789
1790         /* Remove any related forwards */
1791         x25_clear_forward_by_dev(nb->dev);
1792 }
1793
1794 static int __init x25_init(void)
1795 {
1796         int rc = proto_register(&x25_proto, 0);
1797
1798         if (rc != 0)
1799                 goto out;
1800
1801         rc = sock_register(&x25_family_ops);
1802         if (rc != 0)
1803                 goto out_proto;
1804
1805         dev_add_pack(&x25_packet_type);
1806
1807         rc = register_netdevice_notifier(&x25_dev_notifier);
1808         if (rc != 0)
1809                 goto out_sock;
1810
1811         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1812
1813         x25_register_sysctl();
1814         rc = x25_proc_init();
1815         if (rc != 0)
1816                 goto out_dev;
1817 out:
1818         return rc;
1819 out_dev:
1820         unregister_netdevice_notifier(&x25_dev_notifier);
1821 out_sock:
1822         sock_unregister(AF_X25);
1823 out_proto:
1824         proto_unregister(&x25_proto);
1825         goto out;
1826 }
1827 module_init(x25_init);
1828
1829 static void __exit x25_exit(void)
1830 {
1831         x25_proc_exit();
1832         x25_link_free();
1833         x25_route_free();
1834
1835         x25_unregister_sysctl();
1836
1837         unregister_netdevice_notifier(&x25_dev_notifier);
1838
1839         dev_remove_pack(&x25_packet_type);
1840
1841         sock_unregister(AF_X25);
1842         proto_unregister(&x25_proto);
1843 }
1844 module_exit(x25_exit);
1845
1846 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1847 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1848 MODULE_LICENSE("GPL");
1849 MODULE_ALIAS_NETPROTO(PF_X25);