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   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 <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                         sock_set_flag(skb->sk, SOCK_DEAD);
 405                         x25_start_heartbeat(skb->sk);
 406                         x25_sk(skb->sk)->state = X25_STATE_0;
 407                 }
 408
 409                 kfree_skb(skb);
 410         }
 411
 412         if (sk_has_allocations(sk)) {
 413                 /* Defer: outstanding buffers */
 414                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 415                 sk->sk_timer.function = x25_destroy_timer;
 416                 sk->sk_timer.data = (unsigned long)sk;
 417                 add_timer(&sk->sk_timer);
 418         } else {
 419                 /* drop last reference so sock_put will free */
 420                 __sock_put(sk);
 421         }
 422 }
 423
 424 void x25_destroy_socket_from_timer(struct sock *sk)
 425 {
 426         sock_hold(sk);
 427         bh_lock_sock(sk);
 428         __x25_destroy_socket(sk);
 429         bh_unlock_sock(sk);
 430         sock_put(sk);
 431 }
 432
 433 static void x25_destroy_socket(struct sock *sk)
 434 {
 435         sock_hold(sk);
 436         lock_sock(sk);
 437         __x25_destroy_socket(sk);
 438         release_sock(sk);
 439         sock_put(sk);
 440 }
 441
 442 /*
 443  *      Handling for system calls applied via the various interfaces to a
 444  *      X.25 socket object.
 445  */
 446
 447 static int x25_setsockopt(struct socket *sock, int level, int optname,
 448                           char __user *optval, unsigned int optlen)
 449 {
 450         int opt;
 451         struct sock *sk = sock->sk;
 452         int rc = -ENOPROTOOPT;
 453
 454         lock_kernel();
 455         if (level != SOL_X25 || optname != X25_QBITINCL)
 456                 goto out;
 457
 458         rc = -EINVAL;
 459         if (optlen < sizeof(int))
 460                 goto out;
 461
 462         rc = -EFAULT;
 463         if (get_user(opt, (int __user *)optval))
 464                 goto out;
 465
 466         x25_sk(sk)->qbitincl = !!opt;
 467         rc = 0;
 468 out:
 469         unlock_kernel();
 470         return rc;
 471 }
 472
 473 static int x25_getsockopt(struct socket *sock, int level, int optname,
 474                           char __user *optval, int __user *optlen)
 475 {
 476         struct sock *sk = sock->sk;
 477         int val, len, rc = -ENOPROTOOPT;
 478
 479         lock_kernel();
 480         if (level != SOL_X25 || optname != X25_QBITINCL)
 481                 goto out;
 482
 483         rc = -EFAULT;
 484         if (get_user(len, optlen))
 485                 goto out;
 486
 487         len = min_t(unsigned int, len, sizeof(int));
 488
 489         rc = -EINVAL;
 490         if (len < 0)
 491                 goto out;
 492
 493         rc = -EFAULT;
 494         if (put_user(len, optlen))
 495                 goto out;
 496
 497         val = x25_sk(sk)->qbitincl;
 498         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 499 out:
 500         unlock_kernel();
 501         return rc;
 502 }
 503
 504 static int x25_listen(struct socket *sock, int backlog)
 505 {
 506         struct sock *sk = sock->sk;
 507         int rc = -EOPNOTSUPP;
 508
 509         lock_kernel();
 510         if (sk->sk_state != TCP_LISTEN) {
 511                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 512                 sk->sk_max_ack_backlog = backlog;
 513                 sk->sk_state           = TCP_LISTEN;
 514                 rc = 0;
 515         }
 516         unlock_kernel();
 517
 518         return rc;
 519 }
 520
 521 static struct proto x25_proto = {
 522         .name     = "X25",
 523         .owner    = THIS_MODULE,
 524         .obj_size = sizeof(struct x25_sock),
 525 };
 526
 527 static struct sock *x25_alloc_socket(struct net *net)
 528 {
 529         struct x25_sock *x25;
 530         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 531
 532         if (!sk)
 533                 goto out;
 534
 535         sock_init_data(NULL, sk);
 536
 537         x25 = x25_sk(sk);
 538         skb_queue_head_init(&x25->ack_queue);
 539         skb_queue_head_init(&x25->fragment_queue);
 540         skb_queue_head_init(&x25->interrupt_in_queue);
 541         skb_queue_head_init(&x25->interrupt_out_queue);
 542 out:
 543         return sk;
 544 }
 545
 546 static int x25_create(struct net *net, struct socket *sock, int protocol,
 547                       int kern)
 548 {
 549         struct sock *sk;
 550         struct x25_sock *x25;
 551         int rc = -EAFNOSUPPORT;
 552
 553         if (!net_eq(net, &init_net))
 554                 goto out;
 555
 556         rc = -ESOCKTNOSUPPORT;
 557         if (sock->type != SOCK_SEQPACKET)
 558                 goto out;
 559
 560         rc = -EINVAL;
 561         if (protocol)
 562                 goto out;
 563
 564         rc = -ENOBUFS;
 565         if ((sk = x25_alloc_socket(net)) == NULL)
 566                 goto out;
 567
 568         x25 = x25_sk(sk);
 569
 570         sock_init_data(sock, sk);
 571
 572         x25_init_timers(sk);
 573
 574         sock->ops    = &x25_proto_ops;
 575         sk->sk_protocol = protocol;
 576         sk->sk_backlog_rcv = x25_backlog_rcv;
 577
 578         x25->t21   = sysctl_x25_call_request_timeout;
 579         x25->t22   = sysctl_x25_reset_request_timeout;
 580         x25->t23   = sysctl_x25_clear_request_timeout;
 581         x25->t2    = sysctl_x25_ack_holdback_timeout;
 582         x25->state = X25_STATE_0;
 583         x25->cudmatchlength = 0;
 584         x25->accptapprv = X25_DENY_ACCPT_APPRV;         /* normally no cud  */
 585                                                         /* on call accept   */
 586
 587         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 588         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 589         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 590         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 591         x25->facilities.throughput  = X25_DEFAULT_THROUGHPUT;
 592         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 593         x25->dte_facilities.calling_len = 0;
 594         x25->dte_facilities.called_len = 0;
 595         memset(x25->dte_facilities.called_ae, '\0',
 596                         sizeof(x25->dte_facilities.called_ae));
 597         memset(x25->dte_facilities.calling_ae, '\0',
 598                         sizeof(x25->dte_facilities.calling_ae));
 599
 600         rc = 0;
 601 out:
 602         return rc;
 603 }
 604
 605 static struct sock *x25_make_new(struct sock *osk)
 606 {
 607         struct sock *sk = NULL;
 608         struct x25_sock *x25, *ox25;
 609
 610         if (osk->sk_type != SOCK_SEQPACKET)
 611                 goto out;
 612
 613         if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 614                 goto out;
 615
 616         x25 = x25_sk(sk);
 617
 618         sk->sk_type        = osk->sk_type;
 619         sk->sk_priority    = osk->sk_priority;
 620         sk->sk_protocol    = osk->sk_protocol;
 621         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 622         sk->sk_sndbuf      = osk->sk_sndbuf;
 623         sk->sk_state       = TCP_ESTABLISHED;
 624         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 625         sock_copy_flags(sk, osk);
 626
 627         ox25 = x25_sk(osk);
 628         x25->t21        = ox25->t21;
 629         x25->t22        = ox25->t22;
 630         x25->t23        = ox25->t23;
 631         x25->t2         = ox25->t2;
 632         x25->facilities = ox25->facilities;
 633         x25->qbitincl   = ox25->qbitincl;
 634         x25->dte_facilities = ox25->dte_facilities;
 635         x25->cudmatchlength = ox25->cudmatchlength;
 636         x25->accptapprv = ox25->accptapprv;
 637
 638         x25_init_timers(sk);
 639 out:
 640         return sk;
 641 }
 642
 643 static int x25_release(struct socket *sock)
 644 {
 645         struct sock *sk = sock->sk;
 646         struct x25_sock *x25;
 647
 648         lock_kernel();
 649         if (!sk)
 650                 goto out;
 651
 652         x25 = x25_sk(sk);
 653
 654         switch (x25->state) {
 655
 656                 case X25_STATE_0:
 657                 case X25_STATE_2:
 658                         x25_disconnect(sk, 0, 0, 0);
 659                         x25_destroy_socket(sk);
 660                         goto out;
 661
 662                 case X25_STATE_1:
 663                 case X25_STATE_3:
 664                 case X25_STATE_4:
 665                         x25_clear_queues(sk);
 666                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 667                         x25_start_t23timer(sk);
 668                         x25->state = X25_STATE_2;
 669                         sk->sk_state    = TCP_CLOSE;
 670                         sk->sk_shutdown |= SEND_SHUTDOWN;
 671                         sk->sk_state_change(sk);
 672                         sock_set_flag(sk, SOCK_DEAD);
 673                         sock_set_flag(sk, SOCK_DESTROY);
 674                         break;
 675         }
 676
 677         sock_orphan(sk);
 678 out:
 679         unlock_kernel();
 680         return 0;
 681 }
 682
 683 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 684 {
 685         struct sock *sk = sock->sk;
 686         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 687         int len, i, rc = 0;
 688
 689         lock_kernel();
 690         if (!sock_flag(sk, SOCK_ZAPPED) ||
 691             addr_len != sizeof(struct sockaddr_x25) ||
 692             addr->sx25_family != AF_X25) {
 693                 rc = -EINVAL;
 694                 goto out;
 695         }
 696
 697         len = strlen(addr->sx25_addr.x25_addr);
 698         for (i = 0; i < len; i++) {
 699                 if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 700                         rc = -EINVAL;
 701                         goto out;
 702                 }
 703         }
 704
 705         x25_sk(sk)->source_addr = addr->sx25_addr;
 706         x25_insert_socket(sk);
 707         sock_reset_flag(sk, SOCK_ZAPPED);
 708         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 709 out:
 710         unlock_kernel();
 711         return rc;
 712 }
 713
 714 static int x25_wait_for_connection_establishment(struct sock *sk)
 715 {
 716         DECLARE_WAITQUEUE(wait, current);
 717         int rc;
 718
 719         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 720         for (;;) {
 721                 __set_current_state(TASK_INTERRUPTIBLE);
 722                 rc = -ERESTARTSYS;
 723                 if (signal_pending(current))
 724                         break;
 725                 rc = sock_error(sk);
 726                 if (rc) {
 727                         sk->sk_socket->state = SS_UNCONNECTED;
 728                         break;
 729                 }
 730                 rc = 0;
 731                 if (sk->sk_state != TCP_ESTABLISHED) {
 732                         release_sock(sk);
 733                         schedule();
 734                         lock_sock(sk);
 735                 } else
 736                         break;
 737         }
 738         __set_current_state(TASK_RUNNING);
 739         remove_wait_queue(sk->sk_sleep, &wait);
 740         return rc;
 741 }
 742
 743 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 744                        int addr_len, int flags)
 745 {
 746         struct sock *sk = sock->sk;
 747         struct x25_sock *x25 = x25_sk(sk);
 748         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 749         struct x25_route *rt;
 750         int rc = 0;
 751
 752         lock_kernel();
 753         lock_sock(sk);
 754         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 755                 sock->state = SS_CONNECTED;
 756                 goto out; /* Connect completed during a ERESTARTSYS event */
 757         }
 758
 759         rc = -ECONNREFUSED;
 760         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 761                 sock->state = SS_UNCONNECTED;
 762                 goto out;
 763         }
 764
 765         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 766         if (sk->sk_state == TCP_ESTABLISHED)
 767                 goto out;
 768
 769         sk->sk_state   = TCP_CLOSE;
 770         sock->state = SS_UNCONNECTED;
 771
 772         rc = -EINVAL;
 773         if (addr_len != sizeof(struct sockaddr_x25) ||
 774             addr->sx25_family != AF_X25)
 775                 goto out;
 776
 777         rc = -ENETUNREACH;
 778         rt = x25_get_route(&addr->sx25_addr);
 779         if (!rt)
 780                 goto out;
 781
 782         x25->neighbour = x25_get_neigh(rt->dev);
 783         if (!x25->neighbour)
 784                 goto out_put_route;
 785
 786         x25_limit_facilities(&x25->facilities, x25->neighbour);
 787
 788         x25->lci = x25_new_lci(x25->neighbour);
 789         if (!x25->lci)
 790                 goto out_put_neigh;
 791
 792         rc = -EINVAL;
 793         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 794                 goto out_put_neigh;
 795
 796         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 797                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 798
 799         x25->dest_addr = addr->sx25_addr;
 800
 801         /* Move to connecting socket, start sending Connect Requests */
 802         sock->state   = SS_CONNECTING;
 803         sk->sk_state  = TCP_SYN_SENT;
 804
 805         x25->state = X25_STATE_1;
 806
 807         x25_write_internal(sk, X25_CALL_REQUEST);
 808
 809         x25_start_heartbeat(sk);
 810         x25_start_t21timer(sk);
 811
 812         /* Now the loop */
 813         rc = -EINPROGRESS;
 814         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 815                 goto out_put_neigh;
 816
 817         rc = x25_wait_for_connection_establishment(sk);
 818         if (rc)
 819                 goto out_put_neigh;
 820
 821         sock->state = SS_CONNECTED;
 822         rc = 0;
 823 out_put_neigh:
 824         if (rc)
 825                 x25_neigh_put(x25->neighbour);
 826 out_put_route:
 827         x25_route_put(rt);
 828 out:
 829         release_sock(sk);
 830         unlock_kernel();
 831         return rc;
 832 }
 833
 834 static int x25_wait_for_data(struct sock *sk, long timeout)
 835 {
 836         DECLARE_WAITQUEUE(wait, current);
 837         int rc = 0;
 838
 839         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 840         for (;;) {
 841                 __set_current_state(TASK_INTERRUPTIBLE);
 842                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 843                         break;
 844                 rc = -ERESTARTSYS;
 845                 if (signal_pending(current))
 846                         break;
 847                 rc = -EAGAIN;
 848                 if (!timeout)
 849                         break;
 850                 rc = 0;
 851                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 852                         release_sock(sk);
 853                         timeout = schedule_timeout(timeout);
 854                         lock_sock(sk);
 855                 } else
 856                         break;
 857         }
 858         __set_current_state(TASK_RUNNING);
 859         remove_wait_queue(sk->sk_sleep, &wait);
 860         return rc;
 861 }
 862
 863 static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 864 {
 865         struct sock *sk = sock->sk;
 866         struct sock *newsk;
 867         struct sk_buff *skb;
 868         int rc = -EINVAL;
 869
 870         lock_kernel();
 871         if (!sk || sk->sk_state != TCP_LISTEN)
 872                 goto out;
 873
 874         rc = -EOPNOTSUPP;
 875         if (sk->sk_type != SOCK_SEQPACKET)
 876                 goto out;
 877
 878         lock_sock(sk);
 879         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 880         if (rc)
 881                 goto out2;
 882         skb = skb_dequeue(&sk->sk_receive_queue);
 883         rc = -EINVAL;
 884         if (!skb->sk)
 885                 goto out2;
 886         newsk            = skb->sk;
 887         sock_graft(newsk, newsock);
 888
 889         /* Now attach up the new socket */
 890         skb->sk = NULL;
 891         kfree_skb(skb);
 892         sk->sk_ack_backlog--;
 893         newsock->state = SS_CONNECTED;
 894         rc = 0;
 895 out2:
 896         release_sock(sk);
 897 out:
 898         unlock_kernel();
 899         return rc;
 900 }
 901
 902 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 903                        int *uaddr_len, int peer)
 904 {
 905         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 906         struct sock *sk = sock->sk;
 907         struct x25_sock *x25 = x25_sk(sk);
 908         int rc = 0;
 909
 910         lock_kernel();
 911         if (peer) {
 912                 if (sk->sk_state != TCP_ESTABLISHED) {
 913                         rc = -ENOTCONN;
 914                         goto out;
 915                 }
 916                 sx25->sx25_addr = x25->dest_addr;
 917         } else
 918                 sx25->sx25_addr = x25->source_addr;
 919
 920         sx25->sx25_family = AF_X25;
 921         *uaddr_len = sizeof(*sx25);
 922
 923 out:
 924         unlock_kernel();
 925         return rc;
 926 }
 927
 928 static unsigned int x25_datagram_poll(struct file *file, struct socket *sock,
 929                            poll_table *wait)
 930 {
 931         int rc;
 932
 933         lock_kernel();
 934         rc = datagram_poll(file, sock, wait);
 935         unlock_kernel();
 936
 937         return rc;
 938 }
 939
 940 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 941                         unsigned int lci)
 942 {
 943         struct sock *sk;
 944         struct sock *make;
 945         struct x25_sock *makex25;
 946         struct x25_address source_addr, dest_addr;
 947         struct x25_facilities facilities;
 948         struct x25_dte_facilities dte_facilities;
 949         int len, addr_len, rc;
 950
 951         /*
 952          *      Remove the LCI and frame type.
 953          */
 954         skb_pull(skb, X25_STD_MIN_LEN);
 955
 956         /*
 957          *      Extract the X.25 addresses and convert them to ASCII strings,
 958          *      and remove them.
 959          *
 960          *      Address block is mandatory in call request packets
 961          */
 962         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 963         if (addr_len <= 0)
 964                 goto out_clear_request;
 965         skb_pull(skb, addr_len);
 966
 967         /*
 968          *      Get the length of the facilities, skip past them for the moment
 969          *      get the call user data because this is needed to determine
 970          *      the correct listener
 971          *
 972          *      Facilities length is mandatory in call request packets
 973          */
 974         if (skb->len < 1)
 975                 goto out_clear_request;
 976         len = skb->data[0] + 1;
 977         if (skb->len < len)
 978                 goto out_clear_request;
 979         skb_pull(skb,len);
 980
 981         /*
 982          *      Find a listener for the particular address/cud pair.
 983          */
 984         sk = x25_find_listener(&source_addr,skb);
 985         skb_push(skb,len);
 986
 987         if (sk != NULL && sk_acceptq_is_full(sk)) {
 988                 goto out_sock_put;
 989         }
 990
 991         /*
 992          *      We dont have any listeners for this incoming call.
 993          *      Try forwarding it.
 994          */
 995         if (sk == NULL) {
 996                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 997                 if (sysctl_x25_forward &&
 998                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 999                 {
1000                         /* Call was forwarded, dont process it any more */
1001                         kfree_skb(skb);
1002                         rc = 1;
1003                         goto out;
1004                 } else {
1005                         /* No listeners, can't forward, clear the call */
1006                         goto out_clear_request;
1007                 }
1008         }
1009
1010         /*
1011          *      Try to reach a compromise on the requested facilities.
1012          */
1013         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1014         if (len == -1)
1015                 goto out_sock_put;
1016
1017         /*
1018          * current neighbour/link might impose additional limits
1019          * on certain facilties
1020          */
1021
1022         x25_limit_facilities(&facilities, nb);
1023
1024         /*
1025          *      Try to create a new socket.
1026          */
1027         make = x25_make_new(sk);
1028         if (!make)
1029                 goto out_sock_put;
1030
1031         /*
1032          *      Remove the facilities
1033          */
1034         skb_pull(skb, len);
1035
1036         skb->sk     = make;
1037         make->sk_state = TCP_ESTABLISHED;
1038
1039         makex25 = x25_sk(make);
1040         makex25->lci           = lci;
1041         makex25->dest_addr     = dest_addr;
1042         makex25->source_addr   = source_addr;
1043         makex25->neighbour     = nb;
1044         makex25->facilities    = facilities;
1045         makex25->dte_facilities= dte_facilities;
1046         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1047         /* ensure no reverse facil on accept */
1048         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1049         /* ensure no calling address extension on accept */
1050         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1051         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1052
1053         /* Normally all calls are accepted immediatly */
1054         if(makex25->accptapprv & X25_DENY_ACCPT_APPRV) {
1055                 x25_write_internal(make, X25_CALL_ACCEPTED);
1056                 makex25->state = X25_STATE_3;
1057         }
1058
1059         /*
1060          *      Incoming Call User Data.
1061          */
1062         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1063         makex25->calluserdata.cudlength = skb->len;
1064
1065         sk->sk_ack_backlog++;
1066
1067         x25_insert_socket(make);
1068
1069         skb_queue_head(&sk->sk_receive_queue, skb);
1070
1071         x25_start_heartbeat(make);
1072
1073         if (!sock_flag(sk, SOCK_DEAD))
1074                 sk->sk_data_ready(sk, skb->len);
1075         rc = 1;
1076         sock_put(sk);
1077 out:
1078         return rc;
1079 out_sock_put:
1080         sock_put(sk);
1081 out_clear_request:
1082         rc = 0;
1083         x25_transmit_clear_request(nb, lci, 0x01);
1084         goto out;
1085 }
1086
1087 static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1088                        struct msghdr *msg, size_t len)
1089 {
1090         struct sock *sk = sock->sk;
1091         struct x25_sock *x25 = x25_sk(sk);
1092         struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1093         struct sockaddr_x25 sx25;
1094         struct sk_buff *skb;
1095         unsigned char *asmptr;
1096         int noblock = msg->msg_flags & MSG_DONTWAIT;
1097         size_t size;
1098         int qbit = 0, rc = -EINVAL;
1099
1100         lock_kernel();
1101         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1102                 goto out;
1103
1104         /* we currently don't support segmented records at the user interface */
1105         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1106                 goto out;
1107
1108         rc = -EADDRNOTAVAIL;
1109         if (sock_flag(sk, SOCK_ZAPPED))
1110                 goto out;
1111
1112         rc = -EPIPE;
1113         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1114                 send_sig(SIGPIPE, current, 0);
1115                 goto out;
1116         }
1117
1118         rc = -ENETUNREACH;
1119         if (!x25->neighbour)
1120                 goto out;
1121
1122         if (usx25) {
1123                 rc = -EINVAL;
1124                 if (msg->msg_namelen < sizeof(sx25))
1125                         goto out;
1126                 memcpy(&sx25, usx25, sizeof(sx25));
1127                 rc = -EISCONN;
1128                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1129                         goto out;
1130                 rc = -EINVAL;
1131                 if (sx25.sx25_family != AF_X25)
1132                         goto out;
1133         } else {
1134                 /*
1135                  *      FIXME 1003.1g - if the socket is like this because
1136                  *      it has become closed (not started closed) we ought
1137                  *      to SIGPIPE, EPIPE;
1138                  */
1139                 rc = -ENOTCONN;
1140                 if (sk->sk_state != TCP_ESTABLISHED)
1141                         goto out;
1142
1143                 sx25.sx25_family = AF_X25;
1144                 sx25.sx25_addr   = x25->dest_addr;
1145         }
1146
1147         /* Sanity check the packet size */
1148         if (len > 65535) {
1149                 rc = -EMSGSIZE;
1150                 goto out;
1151         }
1152
1153         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1154
1155         /* Build a packet */
1156         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1157
1158         if ((msg->msg_flags & MSG_OOB) && len > 32)
1159                 len = 32;
1160
1161         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1162
1163         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1164         if (!skb)
1165                 goto out;
1166         X25_SKB_CB(skb)->flags = msg->msg_flags;
1167
1168         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1169
1170         /*
1171          *      Put the data on the end
1172          */
1173         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1174
1175         skb_reset_transport_header(skb);
1176         skb_put(skb, len);
1177
1178         rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1179         if (rc)
1180                 goto out_kfree_skb;
1181
1182         /*
1183          *      If the Q BIT Include socket option is in force, the first
1184          *      byte of the user data is the logical value of the Q Bit.
1185          */
1186         if (x25->qbitincl) {
1187                 qbit = skb->data[0];
1188                 skb_pull(skb, 1);
1189         }
1190
1191         /*
1192          *      Push down the X.25 header
1193          */
1194         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1195
1196         if (msg->msg_flags & MSG_OOB) {
1197                 if (x25->neighbour->extended) {
1198                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1199                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1200                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1201                         *asmptr++ = X25_INTERRUPT;
1202                 } else {
1203                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1204                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1205                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1206                         *asmptr++ = X25_INTERRUPT;
1207                 }
1208         } else {
1209                 if (x25->neighbour->extended) {
1210                         /* Build an Extended X.25 header */
1211                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1212                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1213                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1214                         *asmptr++ = X25_DATA;
1215                         *asmptr++ = X25_DATA;
1216                 } else {
1217                         /* Build an Standard X.25 header */
1218                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1219                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1220                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1221                         *asmptr++ = X25_DATA;
1222                 }
1223
1224                 if (qbit)
1225                         skb->data[0] |= X25_Q_BIT;
1226         }
1227
1228         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1229         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1230
1231         rc = -ENOTCONN;
1232         if (sk->sk_state != TCP_ESTABLISHED)
1233                 goto out_kfree_skb;
1234
1235         if (msg->msg_flags & MSG_OOB)
1236                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1237         else {
1238                 rc = x25_output(sk, skb);
1239                 len = rc;
1240                 if (rc < 0)
1241                         kfree_skb(skb);
1242                 else if (x25->qbitincl)
1243                         len++;
1244         }
1245
1246         /*
1247          * lock_sock() is currently only used to serialize this x25_kick()
1248          * against input-driven x25_kick() calls. It currently only blocks
1249          * incoming packets for this socket and does not protect against
1250          * any other socket state changes and is not called from anywhere
1251          * else. As x25_kick() cannot block and as long as all socket
1252          * operations are BKL-wrapped, we don't need take to care about
1253          * purging the backlog queue in x25_release().
1254          *
1255          * Using lock_sock() to protect all socket operations entirely
1256          * (and making the whole x25 stack SMP aware) unfortunately would
1257          * require major changes to {send,recv}msg and skb allocation methods.
1258          * -> 2.5 ;)
1259          */
1260         lock_sock(sk);
1261         x25_kick(sk);
1262         release_sock(sk);
1263         rc = len;
1264 out:
1265         unlock_kernel();
1266         return rc;
1267 out_kfree_skb:
1268         kfree_skb(skb);
1269         goto out;
1270 }
1271
1272
1273 static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1274                        struct msghdr *msg, size_t size,
1275                        int flags)
1276 {
1277         struct sock *sk = sock->sk;
1278         struct x25_sock *x25 = x25_sk(sk);
1279         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1280         size_t copied;
1281         int qbit;
1282         struct sk_buff *skb;
1283         unsigned char *asmptr;
1284         int rc = -ENOTCONN;
1285
1286         lock_kernel();
1287         /*
1288          * This works for seqpacket too. The receiver has ordered the queue for
1289          * us! We do one quick check first though
1290          */
1291         if (sk->sk_state != TCP_ESTABLISHED)
1292                 goto out;
1293
1294         if (flags & MSG_OOB) {
1295                 rc = -EINVAL;
1296                 if (sock_flag(sk, SOCK_URGINLINE) ||
1297                     !skb_peek(&x25->interrupt_in_queue))
1298                         goto out;
1299
1300                 skb = skb_dequeue(&x25->interrupt_in_queue);
1301
1302                 skb_pull(skb, X25_STD_MIN_LEN);
1303
1304                 /*
1305                  *      No Q bit information on Interrupt data.
1306                  */
1307                 if (x25->qbitincl) {
1308                         asmptr  = skb_push(skb, 1);
1309                         *asmptr = 0x00;
1310                 }
1311
1312                 msg->msg_flags |= MSG_OOB;
1313         } else {
1314                 /* Now we can treat all alike */
1315                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1316                                         flags & MSG_DONTWAIT, &rc);
1317                 if (!skb)
1318                         goto out;
1319
1320                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1321
1322                 skb_pull(skb, x25->neighbour->extended ?
1323                                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN);
1324
1325                 if (x25->qbitincl) {
1326                         asmptr  = skb_push(skb, 1);
1327                         *asmptr = qbit;
1328                 }
1329         }
1330
1331         skb_reset_transport_header(skb);
1332         copied = skb->len;
1333
1334         if (copied > size) {
1335                 copied = size;
1336                 msg->msg_flags |= MSG_TRUNC;
1337         }
1338
1339         /* Currently, each datagram always contains a complete record */
1340         msg->msg_flags |= MSG_EOR;
1341
1342         rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1343         if (rc)
1344                 goto out_free_dgram;
1345
1346         if (sx25) {
1347                 sx25->sx25_family = AF_X25;
1348                 sx25->sx25_addr   = x25->dest_addr;
1349         }
1350
1351         msg->msg_namelen = sizeof(struct sockaddr_x25);
1352
1353         lock_sock(sk);
1354         x25_check_rbuf(sk);
1355         release_sock(sk);
1356         rc = copied;
1357 out_free_dgram:
1358         skb_free_datagram(sk, skb);
1359 out:
1360         unlock_kernel();
1361         return rc;
1362 }
1363
1364
1365 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1366 {
1367         struct sock *sk = sock->sk;
1368         struct x25_sock *x25 = x25_sk(sk);
1369         void __user *argp = (void __user *)arg;
1370         int rc;
1371
1372         lock_kernel();
1373         switch (cmd) {
1374                 case TIOCOUTQ: {
1375                         int amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1376
1377                         if (amount < 0)
1378                                 amount = 0;
1379                         rc = put_user(amount, (unsigned int __user *)argp);
1380                         break;
1381                 }
1382
1383                 case TIOCINQ: {
1384                         struct sk_buff *skb;
1385                         int amount = 0;
1386                         /*
1387                          * These two are safe on a single CPU system as
1388                          * only user tasks fiddle here
1389                          */
1390                         if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1391                                 amount = skb->len;
1392                         rc = put_user(amount, (unsigned int __user *)argp);
1393                         break;
1394                 }
1395
1396                 case SIOCGSTAMP:
1397                         rc = -EINVAL;
1398                         if (sk)
1399                                 rc = sock_get_timestamp(sk,
1400                                                 (struct timeval __user *)argp);
1401                         break;
1402                 case SIOCGSTAMPNS:
1403                         rc = -EINVAL;
1404                         if (sk)
1405                                 rc = sock_get_timestampns(sk,
1406                                                 (struct timespec __user *)argp);
1407                         break;
1408                 case SIOCGIFADDR:
1409                 case SIOCSIFADDR:
1410                 case SIOCGIFDSTADDR:
1411                 case SIOCSIFDSTADDR:
1412                 case SIOCGIFBRDADDR:
1413                 case SIOCSIFBRDADDR:
1414                 case SIOCGIFNETMASK:
1415                 case SIOCSIFNETMASK:
1416                 case SIOCGIFMETRIC:
1417                 case SIOCSIFMETRIC:
1418                         rc = -EINVAL;
1419                         break;
1420                 case SIOCADDRT:
1421                 case SIOCDELRT:
1422                         rc = -EPERM;
1423                         if (!capable(CAP_NET_ADMIN))
1424                                 break;
1425                         rc = x25_route_ioctl(cmd, argp);
1426                         break;
1427                 case SIOCX25GSUBSCRIP:
1428                         rc = x25_subscr_ioctl(cmd, argp);
1429                         break;
1430                 case SIOCX25SSUBSCRIP:
1431                         rc = -EPERM;
1432                         if (!capable(CAP_NET_ADMIN))
1433                                 break;
1434                         rc = x25_subscr_ioctl(cmd, argp);
1435                         break;
1436                 case SIOCX25GFACILITIES: {
1437                         struct x25_facilities fac = x25->facilities;
1438                         rc = copy_to_user(argp, &fac,
1439                                           sizeof(fac)) ? -EFAULT : 0;
1440                         break;
1441                 }
1442
1443                 case SIOCX25SFACILITIES: {
1444                         struct x25_facilities facilities;
1445                         rc = -EFAULT;
1446                         if (copy_from_user(&facilities, argp,
1447                                            sizeof(facilities)))
1448                                 break;
1449                         rc = -EINVAL;
1450                         if (sk->sk_state != TCP_LISTEN &&
1451                             sk->sk_state != TCP_CLOSE)
1452                                 break;
1453                         if (facilities.pacsize_in < X25_PS16 ||
1454                             facilities.pacsize_in > X25_PS4096)
1455                                 break;
1456                         if (facilities.pacsize_out < X25_PS16 ||
1457                             facilities.pacsize_out > X25_PS4096)
1458                                 break;
1459                         if (facilities.winsize_in < 1 ||
1460                             facilities.winsize_in > 127)
1461                                 break;
1462                         if (facilities.throughput < 0x03 ||
1463                             facilities.throughput > 0xDD)
1464                                 break;
1465                         if (facilities.reverse &&
1466                                 (facilities.reverse & 0x81) != 0x81)
1467                                 break;
1468                         x25->facilities = facilities;
1469                         rc = 0;
1470                         break;
1471                 }
1472
1473                 case SIOCX25GDTEFACILITIES: {
1474                         rc = copy_to_user(argp, &x25->dte_facilities,
1475                                                 sizeof(x25->dte_facilities));
1476                         if (rc)
1477                                 rc = -EFAULT;
1478                         break;
1479                 }
1480
1481                 case SIOCX25SDTEFACILITIES: {
1482                         struct x25_dte_facilities dtefacs;
1483                         rc = -EFAULT;
1484                         if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1485                                 break;
1486                         rc = -EINVAL;
1487                         if (sk->sk_state != TCP_LISTEN &&
1488                                         sk->sk_state != TCP_CLOSE)
1489                                 break;
1490                         if (dtefacs.calling_len > X25_MAX_AE_LEN)
1491                                 break;
1492                         if (dtefacs.calling_ae == NULL)
1493                                 break;
1494                         if (dtefacs.called_len > X25_MAX_AE_LEN)
1495                                 break;
1496                         if (dtefacs.called_ae == NULL)
1497                                 break;
1498                         x25->dte_facilities = dtefacs;
1499                         rc = 0;
1500                         break;
1501                 }
1502
1503                 case SIOCX25GCALLUSERDATA: {
1504                         struct x25_calluserdata cud = x25->calluserdata;
1505                         rc = copy_to_user(argp, &cud,
1506                                           sizeof(cud)) ? -EFAULT : 0;
1507                         break;
1508                 }
1509
1510                 case SIOCX25SCALLUSERDATA: {
1511                         struct x25_calluserdata calluserdata;
1512
1513                         rc = -EFAULT;
1514                         if (copy_from_user(&calluserdata, argp,
1515                                            sizeof(calluserdata)))
1516                                 break;
1517                         rc = -EINVAL;
1518                         if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1519                                 break;
1520                         x25->calluserdata = calluserdata;
1521                         rc = 0;
1522                         break;
1523                 }
1524
1525                 case SIOCX25GCAUSEDIAG: {
1526                         struct x25_causediag causediag;
1527                         causediag = x25->causediag;
1528                         rc = copy_to_user(argp, &causediag,
1529                                           sizeof(causediag)) ? -EFAULT : 0;
1530                         break;
1531                 }
1532
1533                 case SIOCX25SCAUSEDIAG: {
1534                         struct x25_causediag causediag;
1535                         rc = -EFAULT;
1536                         if (copy_from_user(&causediag, argp, sizeof(causediag)))
1537                                 break;
1538                         x25->causediag = causediag;
1539                         rc = 0;
1540                         break;
1541
1542                 }
1543
1544                 case SIOCX25SCUDMATCHLEN: {
1545                         struct x25_subaddr sub_addr;
1546                         rc = -EINVAL;
1547                         if(sk->sk_state != TCP_CLOSE)
1548                                 break;
1549                         rc = -EFAULT;
1550                         if (copy_from_user(&sub_addr, argp,
1551                                         sizeof(sub_addr)))
1552                                 break;
1553                         rc = -EINVAL;
1554                         if(sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1555                                 break;
1556                         x25->cudmatchlength = sub_addr.cudmatchlength;
1557                         rc = 0;
1558                         break;
1559                 }
1560
1561                 case SIOCX25CALLACCPTAPPRV: {
1562                         rc = -EINVAL;
1563                         if (sk->sk_state != TCP_CLOSE)
1564                                 break;
1565                         x25->accptapprv = X25_ALLOW_ACCPT_APPRV;
1566                         rc = 0;
1567                         break;
1568                 }
1569
1570                 case SIOCX25SENDCALLACCPT:  {
1571                         rc = -EINVAL;
1572                         if (sk->sk_state != TCP_ESTABLISHED)
1573                                 break;
1574                         if (x25->accptapprv)    /* must call accptapprv above */
1575                                 break;
1576                         x25_write_internal(sk, X25_CALL_ACCEPTED);
1577                         x25->state = X25_STATE_3;
1578                         rc = 0;
1579                         break;
1580                 }
1581
1582                 default:
1583                         rc = -ENOIOCTLCMD;
1584                         break;
1585         }
1586         unlock_kernel();
1587
1588         return rc;
1589 }
1590
1591 static const struct net_proto_family x25_family_ops = {
1592         .family =       AF_X25,
1593         .create =       x25_create,
1594         .owner  =       THIS_MODULE,
1595 };
1596
1597 #ifdef CONFIG_COMPAT
1598 static int compat_x25_subscr_ioctl(unsigned int cmd,
1599                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1600 {
1601         struct compat_x25_subscrip_struct x25_subscr;
1602         struct x25_neigh *nb;
1603         struct net_device *dev;
1604         int rc = -EINVAL;
1605
1606         rc = -EFAULT;
1607         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1608                 goto out;
1609
1610         rc = -EINVAL;
1611         dev = x25_dev_get(x25_subscr.device);
1612         if (dev == NULL)
1613                 goto out;
1614
1615         nb = x25_get_neigh(dev);
1616         if (nb == NULL)
1617                 goto out_dev_put;
1618
1619         dev_put(dev);
1620
1621         if (cmd == SIOCX25GSUBSCRIP) {
1622                 x25_subscr.extended = nb->extended;
1623                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1624                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1625                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1626         } else {
1627                 rc = -EINVAL;
1628                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1629                         rc = 0;
1630                         nb->extended = x25_subscr.extended;
1631                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1632                 }
1633         }
1634         x25_neigh_put(nb);
1635 out:
1636         return rc;
1637 out_dev_put:
1638         dev_put(dev);
1639         goto out;
1640 }
1641
1642 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1643                                 unsigned long arg)
1644 {
1645         void __user *argp = compat_ptr(arg);
1646         struct sock *sk = sock->sk;
1647
1648         int rc = -ENOIOCTLCMD;
1649
1650         switch(cmd) {
1651         case TIOCOUTQ:
1652         case TIOCINQ:
1653                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1654                 break;
1655         case SIOCGSTAMP:
1656                 rc = -EINVAL;
1657                 lock_kernel();
1658                 if (sk)
1659                         rc = compat_sock_get_timestamp(sk,
1660                                         (struct timeval __user*)argp);
1661                 unlock_kernel();
1662                 break;
1663         case SIOCGSTAMPNS:
1664                 rc = -EINVAL;
1665                 lock_kernel();
1666                 if (sk)
1667                         rc = compat_sock_get_timestampns(sk,
1668                                         (struct timespec __user*)argp);
1669                 unlock_kernel();
1670                 break;
1671         case SIOCGIFADDR:
1672         case SIOCSIFADDR:
1673         case SIOCGIFDSTADDR:
1674         case SIOCSIFDSTADDR:
1675         case SIOCGIFBRDADDR:
1676         case SIOCSIFBRDADDR:
1677         case SIOCGIFNETMASK:
1678         case SIOCSIFNETMASK:
1679         case SIOCGIFMETRIC:
1680         case SIOCSIFMETRIC:
1681                 rc = -EINVAL;
1682                 break;
1683         case SIOCADDRT:
1684         case SIOCDELRT:
1685                 rc = -EPERM;
1686                 if (!capable(CAP_NET_ADMIN))
1687                         break;
1688                 lock_kernel();
1689                 rc = x25_route_ioctl(cmd, argp);
1690                 unlock_kernel();
1691                 break;
1692         case SIOCX25GSUBSCRIP:
1693                 lock_kernel();
1694                 rc = compat_x25_subscr_ioctl(cmd, argp);
1695                 unlock_kernel();
1696                 break;
1697         case SIOCX25SSUBSCRIP:
1698                 rc = -EPERM;
1699                 if (!capable(CAP_NET_ADMIN))
1700                         break;
1701                 lock_kernel();
1702                 rc = compat_x25_subscr_ioctl(cmd, argp);
1703                 unlock_kernel();
1704                 break;
1705         case SIOCX25GFACILITIES:
1706         case SIOCX25SFACILITIES:
1707         case SIOCX25GDTEFACILITIES:
1708         case SIOCX25SDTEFACILITIES:
1709         case SIOCX25GCALLUSERDATA:
1710         case SIOCX25SCALLUSERDATA:
1711         case SIOCX25GCAUSEDIAG:
1712         case SIOCX25SCAUSEDIAG:
1713         case SIOCX25SCUDMATCHLEN:
1714         case SIOCX25CALLACCPTAPPRV:
1715         case SIOCX25SENDCALLACCPT:
1716                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1717                 break;
1718         default:
1719                 rc = -ENOIOCTLCMD;
1720                 break;
1721         }
1722         return rc;
1723 }
1724 #endif
1725
1726 static const struct proto_ops x25_proto_ops = {
1727         .family =       AF_X25,
1728         .owner =        THIS_MODULE,
1729         .release =      x25_release,
1730         .bind =         x25_bind,
1731         .connect =      x25_connect,
1732         .socketpair =   sock_no_socketpair,
1733         .accept =       x25_accept,
1734         .getname =      x25_getname,
1735         .poll =         x25_datagram_poll,
1736         .ioctl =        x25_ioctl,
1737 #ifdef CONFIG_COMPAT
1738         .compat_ioctl = compat_x25_ioctl,
1739 #endif
1740         .listen =       x25_listen,
1741         .shutdown =     sock_no_shutdown,
1742         .setsockopt =   x25_setsockopt,
1743         .getsockopt =   x25_getsockopt,
1744         .sendmsg =      x25_sendmsg,
1745         .recvmsg =      x25_recvmsg,
1746         .mmap =         sock_no_mmap,
1747         .sendpage =     sock_no_sendpage,
1748 };
1749
1750 static struct packet_type x25_packet_type __read_mostly = {
1751         .type = cpu_to_be16(ETH_P_X25),
1752         .func = x25_lapb_receive_frame,
1753 };
1754
1755 static struct notifier_block x25_dev_notifier = {
1756         .notifier_call = x25_device_event,
1757 };
1758
1759 void x25_kill_by_neigh(struct x25_neigh *nb)
1760 {
1761         struct sock *s;
1762         struct hlist_node *node;
1763
1764         write_lock_bh(&x25_list_lock);
1765
1766         sk_for_each(s, node, &x25_list)
1767                 if (x25_sk(s)->neighbour == nb)
1768                         x25_disconnect(s, ENETUNREACH, 0, 0);
1769
1770         write_unlock_bh(&x25_list_lock);
1771
1772         /* Remove any related forwards */
1773         x25_clear_forward_by_dev(nb->dev);
1774 }
1775
1776 static int __init x25_init(void)
1777 {
1778         int rc = proto_register(&x25_proto, 0);
1779
1780         if (rc != 0)
1781                 goto out;
1782
1783         rc = sock_register(&x25_family_ops);
1784         if (rc != 0)
1785                 goto out_proto;
1786
1787         dev_add_pack(&x25_packet_type);
1788
1789         rc = register_netdevice_notifier(&x25_dev_notifier);
1790         if (rc != 0)
1791                 goto out_sock;
1792
1793         printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1794
1795         x25_register_sysctl();
1796         rc = x25_proc_init();
1797         if (rc != 0)
1798                 goto out_dev;
1799 out:
1800         return rc;
1801 out_dev:
1802         unregister_netdevice_notifier(&x25_dev_notifier);
1803 out_sock:
1804         sock_unregister(AF_X25);
1805 out_proto:
1806         proto_unregister(&x25_proto);
1807         goto out;
1808 }
1809 module_init(x25_init);
1810
1811 static void __exit x25_exit(void)
1812 {
1813         x25_proc_exit();
1814         x25_link_free();
1815         x25_route_free();
1816
1817         x25_unregister_sysctl();
1818
1819         unregister_netdevice_notifier(&x25_dev_notifier);
1820
1821         dev_remove_pack(&x25_packet_type);
1822
1823         sock_unregister(AF_X25);
1824         proto_unregister(&x25_proto);
1825 }
1826 module_exit(x25_exit);
1827
1828 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1829 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1830 MODULE_LICENSE("GPL");
1831 MODULE_ALIAS_NETPROTO(PF_X25);