net/x25/af_x25.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      X.25 Packet Layer release 002
   4  *
   5  *      This is ALPHA test software. This code may break your machine,
   6  *      randomly fail to work with new releases, misbehave and/or generally
   7  *      screw up. It might even work.
   8  *
   9  *      This code REQUIRES 2.1.15 or higher
  10  *
  11  *      History
  12  *      X.25 001        Jonathan Naylor Started coding.
  13  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  14  *                                      New timer architecture.
  15  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  16  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  17  *                                        facilities negotiation and increased
  18  *                                        the throughput upper limit.
  19  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  20  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  21  *                                      Fixed x25_output() related skb leakage.
  22  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  23  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  24  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  25  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  26  *                                      x25_proc.c, using seq_file
  27  *      2005-04-02      Shaun Pereira   Selective sub address matching
  28  *                                      with call user data
  29  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  30  *                                      response
  31  */
  32
  33 #define pr_fmt(fmt) "X25: " fmt
  34
  35 #include <linux/module.h>
  36 #include <linux/capability.h>
  37 #include <linux/errno.h>
  38 #include <linux/kernel.h>
  39 #include <linux/sched/signal.h>
  40 #include <linux/timer.h>
  41 #include <linux/string.h>
  42 #include <linux/net.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/if_arp.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/slab.h>
  47 #include <net/sock.h>
  48 #include <net/tcp_states.h>
  49 #include <linux/uaccess.h>
  50 #include <linux/fcntl.h>
  51 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  52 #include <linux/notifier.h>
  53 #include <linux/init.h>
  54 #include <linux/compat.h>
  55 #include <linux/ctype.h>
  56
  57 #include <net/x25.h>
  58 #include <net/compat.h>
  59
  60 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  61 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  62 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  63 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  64 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  65 int sysctl_x25_forward                 = 0;
  66
  67 HLIST_HEAD(x25_list);
  68 DEFINE_RWLOCK(x25_list_lock);
  69
  70 static const struct proto_ops x25_proto_ops;
  71
  72 static const struct x25_address null_x25_address = {"               "};
  73
  74 #ifdef CONFIG_COMPAT
  75 struct compat_x25_subscrip_struct {
  76         char device[200-sizeof(compat_ulong_t)];
  77         compat_ulong_t global_facil_mask;
  78         compat_uint_t extended;
  79 };
  80 #endif
  81
  82
  83 int x25_parse_address_block(struct sk_buff *skb,
  84                 struct x25_address *called_addr,
  85                 struct x25_address *calling_addr)
  86 {
  87         unsigned char len;
  88         int needed;
  89         int rc;
  90
  91         if (!pskb_may_pull(skb, 1)) {
  92                 /* packet has no address block */
  93                 rc = 0;
  94                 goto empty;
  95         }
  96
  97         len = *skb->data;
  98         needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
  99
 100         if (!pskb_may_pull(skb, needed)) {
 101                 /* packet is too short to hold the addresses it claims
 102                    to hold */
 103                 rc = -1;
 104                 goto empty;
 105         }
 106
 107         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 108
 109 empty:
 110         *called_addr->x25_addr = 0;
 111         *calling_addr->x25_addr = 0;
 112
 113         return rc;
 114 }
 115
 116
 117 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 118                   struct x25_address *calling_addr)
 119 {
 120         unsigned int called_len, calling_len;
 121         char *called, *calling;
 122         unsigned int i;
 123
 124         called_len  = (*p >> 0) & 0x0F;
 125         calling_len = (*p >> 4) & 0x0F;
 126
 127         called  = called_addr->x25_addr;
 128         calling = calling_addr->x25_addr;
 129         p++;
 130
 131         for (i = 0; i < (called_len + calling_len); i++) {
 132                 if (i < called_len) {
 133                         if (i % 2 != 0) {
 134                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 135                                 p++;
 136                         } else {
 137                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 138                         }
 139                 } else {
 140                         if (i % 2 != 0) {
 141                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 142                                 p++;
 143                         } else {
 144                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 145                         }
 146                 }
 147         }
 148
 149         *called = *calling = '\0';
 150
 151         return 1 + (called_len + calling_len + 1) / 2;
 152 }
 153
 154 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 155                   struct x25_address *calling_addr)
 156 {
 157         unsigned int called_len, calling_len;
 158         char *called, *calling;
 159         int i;
 160
 161         called  = called_addr->x25_addr;
 162         calling = calling_addr->x25_addr;
 163
 164         called_len  = strlen(called);
 165         calling_len = strlen(calling);
 166
 167         *p++ = (calling_len << 4) | (called_len << 0);
 168
 169         for (i = 0; i < (called_len + calling_len); i++) {
 170                 if (i < called_len) {
 171                         if (i % 2 != 0) {
 172                                 *p |= (*called++ - '0') << 0;
 173                                 p++;
 174                         } else {
 175                                 *p = 0x00;
 176                                 *p |= (*called++ - '0') << 4;
 177                         }
 178                 } else {
 179                         if (i % 2 != 0) {
 180                                 *p |= (*calling++ - '0') << 0;
 181                                 p++;
 182                         } else {
 183                                 *p = 0x00;
 184                                 *p |= (*calling++ - '0') << 4;
 185                         }
 186                 }
 187         }
 188
 189         return 1 + (called_len + calling_len + 1) / 2;
 190 }
 191
 192 /*
 193  *      Socket removal during an interrupt is now safe.
 194  */
 195 static void x25_remove_socket(struct sock *sk)
 196 {
 197         write_lock_bh(&x25_list_lock);
 198         sk_del_node_init(sk);
 199         write_unlock_bh(&x25_list_lock);
 200 }
 201
 202 /*
 203  *      Handle device status changes.
 204  */
 205 static int x25_device_event(struct notifier_block *this, unsigned long event,
 206                             void *ptr)
 207 {
 208         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 209         struct x25_neigh *nb;
 210
 211         if (!net_eq(dev_net(dev), &init_net))
 212                 return NOTIFY_DONE;
 213
 214         if (dev->type == ARPHRD_X25) {
 215                 switch (event) {
 216                 case NETDEV_REGISTER:
 217                 case NETDEV_POST_TYPE_CHANGE:
 218                         x25_link_device_up(dev);
 219                         break;
 220                 case NETDEV_DOWN:
 221                         nb = x25_get_neigh(dev);
 222                         if (nb) {
 223                                 x25_link_terminated(nb);
 224                                 x25_neigh_put(nb);
 225                         }
 226                         x25_route_device_down(dev);
 227                         break;
 228                 case NETDEV_PRE_TYPE_CHANGE:
 229                 case NETDEV_UNREGISTER:
 230                         x25_link_device_down(dev);
 231                         break;
 232                 case NETDEV_CHANGE:
 233                         if (!netif_carrier_ok(dev)) {
 234                                 nb = x25_get_neigh(dev);
 235                                 if (nb) {
 236                                         x25_link_terminated(nb);
 237                                         x25_neigh_put(nb);
 238                                 }
 239                         }
 240                         break;
 241                 }
 242         }
 243
 244         return NOTIFY_DONE;
 245 }
 246
 247 /*
 248  *      Add a socket to the bound sockets list.
 249  */
 250 static void x25_insert_socket(struct sock *sk)
 251 {
 252         write_lock_bh(&x25_list_lock);
 253         sk_add_node(sk, &x25_list);
 254         write_unlock_bh(&x25_list_lock);
 255 }
 256
 257 /*
 258  *      Find a socket that wants to accept the Call Request we just
 259  *      received. Check the full list for an address/cud match.
 260  *      If no cuds match return the next_best thing, an address match.
 261  *      Note: if a listening socket has cud set it must only get calls
 262  *      with matching cud.
 263  */
 264 static struct sock *x25_find_listener(struct x25_address *addr,
 265                                         struct sk_buff *skb)
 266 {
 267         struct sock *s;
 268         struct sock *next_best;
 269
 270         read_lock_bh(&x25_list_lock);
 271         next_best = NULL;
 272
 273         sk_for_each(s, &x25_list)
 274                 if ((!strcmp(addr->x25_addr,
 275                         x25_sk(s)->source_addr.x25_addr) ||
 276                                 !strcmp(x25_sk(s)->source_addr.x25_addr,
 277                                         null_x25_address.x25_addr)) &&
 278                                         s->sk_state == TCP_LISTEN) {
 279                         /*
 280                          * Found a listening socket, now check the incoming
 281                          * call user data vs this sockets call user data
 282                          */
 283                         if (x25_sk(s)->cudmatchlength > 0 &&
 284                                 skb->len >= x25_sk(s)->cudmatchlength) {
 285                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 286                                         skb->data,
 287                                         x25_sk(s)->cudmatchlength)) == 0) {
 288                                         sock_hold(s);
 289                                         goto found;
 290                                  }
 291                         } else
 292                                 next_best = s;
 293                 }
 294         if (next_best) {
 295                 s = next_best;
 296                 sock_hold(s);
 297                 goto found;
 298         }
 299         s = NULL;
 300 found:
 301         read_unlock_bh(&x25_list_lock);
 302         return s;
 303 }
 304
 305 /*
 306  *      Find a connected X.25 socket given my LCI and neighbour.
 307  */
 308 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 309 {
 310         struct sock *s;
 311
 312         sk_for_each(s, &x25_list)
 313                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 314                         sock_hold(s);
 315                         goto found;
 316                 }
 317         s = NULL;
 318 found:
 319         return s;
 320 }
 321
 322 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 323 {
 324         struct sock *s;
 325
 326         read_lock_bh(&x25_list_lock);
 327         s = __x25_find_socket(lci, nb);
 328         read_unlock_bh(&x25_list_lock);
 329         return s;
 330 }
 331
 332 /*
 333  *      Find a unique LCI for a given device.
 334  */
 335 static unsigned int x25_new_lci(struct x25_neigh *nb)
 336 {
 337         unsigned int lci = 1;
 338         struct sock *sk;
 339
 340         while ((sk = x25_find_socket(lci, nb)) != NULL) {
 341                 sock_put(sk);
 342                 if (++lci == 4096) {
 343                         lci = 0;
 344                         break;
 345                 }
 346                 cond_resched();
 347         }
 348
 349         return lci;
 350 }
 351
 352 /*
 353  *      Deferred destroy.
 354  */
 355 static void __x25_destroy_socket(struct sock *);
 356
 357 /*
 358  *      handler for deferred kills.
 359  */
 360 static void x25_destroy_timer(struct timer_list *t)
 361 {
 362         struct sock *sk = from_timer(sk, t, sk_timer);
 363
 364         x25_destroy_socket_from_timer(sk);
 365 }
 366
 367 /*
 368  *      This is called from user mode and the timers. Thus it protects itself
 369  *      against interrupting users but doesn't worry about being called during
 370  *      work. Once it is removed from the queue no interrupt or bottom half
 371  *      will touch it and we are (fairly 8-) ) safe.
 372  *      Not static as it's used by the timer
 373  */
 374 static void __x25_destroy_socket(struct sock *sk)
 375 {
 376         struct sk_buff *skb;
 377
 378         x25_stop_heartbeat(sk);
 379         x25_stop_timer(sk);
 380
 381         x25_remove_socket(sk);
 382         x25_clear_queues(sk);           /* Flush the queues */
 383
 384         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 385                 if (skb->sk != sk) {            /* A pending connection */
 386                         /*
 387                          * Queue the unaccepted socket for death
 388                          */
 389                         skb->sk->sk_state = TCP_LISTEN;
 390                         sock_set_flag(skb->sk, SOCK_DEAD);
 391                         x25_start_heartbeat(skb->sk);
 392                         x25_sk(skb->sk)->state = X25_STATE_0;
 393                 }
 394
 395                 kfree_skb(skb);
 396         }
 397
 398         if (sk_has_allocations(sk)) {
 399                 /* Defer: outstanding buffers */
 400                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 401                 sk->sk_timer.function = x25_destroy_timer;
 402                 add_timer(&sk->sk_timer);
 403         } else {
 404                 /* drop last reference so sock_put will free */
 405                 __sock_put(sk);
 406         }
 407 }
 408
 409 void x25_destroy_socket_from_timer(struct sock *sk)
 410 {
 411         sock_hold(sk);
 412         bh_lock_sock(sk);
 413         __x25_destroy_socket(sk);
 414         bh_unlock_sock(sk);
 415         sock_put(sk);
 416 }
 417
 418 /*
 419  *      Handling for system calls applied via the various interfaces to a
 420  *      X.25 socket object.
 421  */
 422
 423 static int x25_setsockopt(struct socket *sock, int level, int optname,
 424                           sockptr_t optval, unsigned int optlen)
 425 {
 426         int opt;
 427         struct sock *sk = sock->sk;
 428         int rc = -ENOPROTOOPT;
 429
 430         if (level != SOL_X25 || optname != X25_QBITINCL)
 431                 goto out;
 432
 433         rc = -EINVAL;
 434         if (optlen < sizeof(int))
 435                 goto out;
 436
 437         rc = -EFAULT;
 438         if (copy_from_sockptr(&opt, optval, sizeof(int)))
 439                 goto out;
 440
 441         if (opt)
 442                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 443         else
 444                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 445         rc = 0;
 446 out:
 447         return rc;
 448 }
 449
 450 static int x25_getsockopt(struct socket *sock, int level, int optname,
 451                           char __user *optval, int __user *optlen)
 452 {
 453         struct sock *sk = sock->sk;
 454         int val, len, rc = -ENOPROTOOPT;
 455
 456         if (level != SOL_X25 || optname != X25_QBITINCL)
 457                 goto out;
 458
 459         rc = -EFAULT;
 460         if (get_user(len, optlen))
 461                 goto out;
 462
 463         len = min_t(unsigned int, len, sizeof(int));
 464
 465         rc = -EINVAL;
 466         if (len < 0)
 467                 goto out;
 468
 469         rc = -EFAULT;
 470         if (put_user(len, optlen))
 471                 goto out;
 472
 473         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 474         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 475 out:
 476         return rc;
 477 }
 478
 479 static int x25_listen(struct socket *sock, int backlog)
 480 {
 481         struct sock *sk = sock->sk;
 482         int rc = -EOPNOTSUPP;
 483
 484         lock_sock(sk);
 485         if (sk->sk_state != TCP_LISTEN) {
 486                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 487                 sk->sk_max_ack_backlog = backlog;
 488                 sk->sk_state           = TCP_LISTEN;
 489                 rc = 0;
 490         }
 491         release_sock(sk);
 492
 493         return rc;
 494 }
 495
 496 static struct proto x25_proto = {
 497         .name     = "X25",
 498         .owner    = THIS_MODULE,
 499         .obj_size = sizeof(struct x25_sock),
 500 };
 501
 502 static struct sock *x25_alloc_socket(struct net *net, int kern)
 503 {
 504         struct x25_sock *x25;
 505         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 506
 507         if (!sk)
 508                 goto out;
 509
 510         sock_init_data(NULL, sk);
 511
 512         x25 = x25_sk(sk);
 513         skb_queue_head_init(&x25->ack_queue);
 514         skb_queue_head_init(&x25->fragment_queue);
 515         skb_queue_head_init(&x25->interrupt_in_queue);
 516         skb_queue_head_init(&x25->interrupt_out_queue);
 517 out:
 518         return sk;
 519 }
 520
 521 static int x25_create(struct net *net, struct socket *sock, int protocol,
 522                       int kern)
 523 {
 524         struct sock *sk;
 525         struct x25_sock *x25;
 526         int rc = -EAFNOSUPPORT;
 527
 528         if (!net_eq(net, &init_net))
 529                 goto out;
 530
 531         rc = -ESOCKTNOSUPPORT;
 532         if (sock->type != SOCK_SEQPACKET)
 533                 goto out;
 534
 535         rc = -EINVAL;
 536         if (protocol)
 537                 goto out;
 538
 539         rc = -ENOMEM;
 540         if ((sk = x25_alloc_socket(net, kern)) == NULL)
 541                 goto out;
 542
 543         x25 = x25_sk(sk);
 544
 545         sock_init_data(sock, sk);
 546
 547         x25_init_timers(sk);
 548
 549         sock->ops    = &x25_proto_ops;
 550         sk->sk_protocol = protocol;
 551         sk->sk_backlog_rcv = x25_backlog_rcv;
 552
 553         x25->t21   = sysctl_x25_call_request_timeout;
 554         x25->t22   = sysctl_x25_reset_request_timeout;
 555         x25->t23   = sysctl_x25_clear_request_timeout;
 556         x25->t2    = sysctl_x25_ack_holdback_timeout;
 557         x25->state = X25_STATE_0;
 558         x25->cudmatchlength = 0;
 559         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 560                                                         /* on call accept   */
 561
 562         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 563         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 564         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 565         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 566         x25->facilities.throughput  = 0;        /* by default don't negotiate
 567                                                    throughput */
 568         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 569         x25->dte_facilities.calling_len = 0;
 570         x25->dte_facilities.called_len = 0;
 571         memset(x25->dte_facilities.called_ae, '\0',
 572                         sizeof(x25->dte_facilities.called_ae));
 573         memset(x25->dte_facilities.calling_ae, '\0',
 574                         sizeof(x25->dte_facilities.calling_ae));
 575
 576         rc = 0;
 577 out:
 578         return rc;
 579 }
 580
 581 static struct sock *x25_make_new(struct sock *osk)
 582 {
 583         struct sock *sk = NULL;
 584         struct x25_sock *x25, *ox25;
 585
 586         if (osk->sk_type != SOCK_SEQPACKET)
 587                 goto out;
 588
 589         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
 590                 goto out;
 591
 592         x25 = x25_sk(sk);
 593
 594         sk->sk_type        = osk->sk_type;
 595         sk->sk_priority    = osk->sk_priority;
 596         sk->sk_protocol    = osk->sk_protocol;
 597         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 598         sk->sk_sndbuf      = osk->sk_sndbuf;
 599         sk->sk_state       = TCP_ESTABLISHED;
 600         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 601         sock_copy_flags(sk, osk);
 602
 603         ox25 = x25_sk(osk);
 604         x25->t21        = ox25->t21;
 605         x25->t22        = ox25->t22;
 606         x25->t23        = ox25->t23;
 607         x25->t2         = ox25->t2;
 608         x25->flags      = ox25->flags;
 609         x25->facilities = ox25->facilities;
 610         x25->dte_facilities = ox25->dte_facilities;
 611         x25->cudmatchlength = ox25->cudmatchlength;
 612
 613         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 614         x25_init_timers(sk);
 615 out:
 616         return sk;
 617 }
 618
 619 static int x25_release(struct socket *sock)
 620 {
 621         struct sock *sk = sock->sk;
 622         struct x25_sock *x25;
 623
 624         if (!sk)
 625                 return 0;
 626
 627         x25 = x25_sk(sk);
 628
 629         sock_hold(sk);
 630         lock_sock(sk);
 631         switch (x25->state) {
 632
 633                 case X25_STATE_0:
 634                 case X25_STATE_2:
 635                         x25_disconnect(sk, 0, 0, 0);
 636                         __x25_destroy_socket(sk);
 637                         goto out;
 638
 639                 case X25_STATE_1:
 640                 case X25_STATE_3:
 641                 case X25_STATE_4:
 642                         x25_clear_queues(sk);
 643                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 644                         x25_start_t23timer(sk);
 645                         x25->state = X25_STATE_2;
 646                         sk->sk_state    = TCP_CLOSE;
 647                         sk->sk_shutdown |= SEND_SHUTDOWN;
 648                         sk->sk_state_change(sk);
 649                         sock_set_flag(sk, SOCK_DEAD);
 650                         sock_set_flag(sk, SOCK_DESTROY);
 651                         break;
 652
 653                 case X25_STATE_5:
 654                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 655                         x25_disconnect(sk, 0, 0, 0);
 656                         __x25_destroy_socket(sk);
 657                         goto out;
 658         }
 659
 660         sock_orphan(sk);
 661 out:
 662         release_sock(sk);
 663         sock_put(sk);
 664         return 0;
 665 }
 666
 667 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 668 {
 669         struct sock *sk = sock->sk;
 670         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 671         int len, i, rc = 0;
 672
 673         if (addr_len != sizeof(struct sockaddr_x25) ||
 674             addr->sx25_family != AF_X25 ||
 675             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN) {
 676                 rc = -EINVAL;
 677                 goto out;
 678         }
 679
 680         /* check for the null_x25_address */
 681         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
 682
 683                 len = strlen(addr->sx25_addr.x25_addr);
 684                 for (i = 0; i < len; i++) {
 685                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 686                                 rc = -EINVAL;
 687                                 goto out;
 688                         }
 689                 }
 690         }
 691
 692         lock_sock(sk);
 693         if (sock_flag(sk, SOCK_ZAPPED)) {
 694                 x25_sk(sk)->source_addr = addr->sx25_addr;
 695                 x25_insert_socket(sk);
 696                 sock_reset_flag(sk, SOCK_ZAPPED);
 697         } else {
 698                 rc = -EINVAL;
 699         }
 700         release_sock(sk);
 701         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 702 out:
 703         return rc;
 704 }
 705
 706 static int x25_wait_for_connection_establishment(struct sock *sk)
 707 {
 708         DECLARE_WAITQUEUE(wait, current);
 709         int rc;
 710
 711         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 712         for (;;) {
 713                 __set_current_state(TASK_INTERRUPTIBLE);
 714                 rc = -ERESTARTSYS;
 715                 if (signal_pending(current))
 716                         break;
 717                 rc = sock_error(sk);
 718                 if (rc) {
 719                         sk->sk_socket->state = SS_UNCONNECTED;
 720                         break;
 721                 }
 722                 rc = 0;
 723                 if (sk->sk_state != TCP_ESTABLISHED) {
 724                         release_sock(sk);
 725                         schedule();
 726                         lock_sock(sk);
 727                 } else
 728                         break;
 729         }
 730         __set_current_state(TASK_RUNNING);
 731         remove_wait_queue(sk_sleep(sk), &wait);
 732         return rc;
 733 }
 734
 735 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 736                        int addr_len, int flags)
 737 {
 738         struct sock *sk = sock->sk;
 739         struct x25_sock *x25 = x25_sk(sk);
 740         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 741         struct x25_route *rt;
 742         int rc = 0;
 743
 744         lock_sock(sk);
 745         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 746                 sock->state = SS_CONNECTED;
 747                 goto out; /* Connect completed during a ERESTARTSYS event */
 748         }
 749
 750         rc = -ECONNREFUSED;
 751         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 752                 sock->state = SS_UNCONNECTED;
 753                 goto out;
 754         }
 755
 756         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 757         if (sk->sk_state == TCP_ESTABLISHED)
 758                 goto out;
 759
 760         rc = -EALREADY; /* Do nothing if call is already in progress */
 761         if (sk->sk_state == TCP_SYN_SENT)
 762                 goto out;
 763
 764         sk->sk_state   = TCP_CLOSE;
 765         sock->state = SS_UNCONNECTED;
 766
 767         rc = -EINVAL;
 768         if (addr_len != sizeof(struct sockaddr_x25) ||
 769             addr->sx25_family != AF_X25 ||
 770             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
 771                 goto out;
 772
 773         rc = -ENETUNREACH;
 774         rt = x25_get_route(&addr->sx25_addr);
 775         if (!rt)
 776                 goto out;
 777
 778         x25->neighbour = x25_get_neigh(rt->dev);
 779         if (!x25->neighbour)
 780                 goto out_put_route;
 781
 782         x25_limit_facilities(&x25->facilities, x25->neighbour);
 783
 784         x25->lci = x25_new_lci(x25->neighbour);
 785         if (!x25->lci)
 786                 goto out_put_neigh;
 787
 788         rc = -EINVAL;
 789         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 790                 goto out_put_neigh;
 791
 792         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 793                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 794
 795         x25->dest_addr = addr->sx25_addr;
 796
 797         /* Move to connecting socket, start sending Connect Requests */
 798         sock->state   = SS_CONNECTING;
 799         sk->sk_state  = TCP_SYN_SENT;
 800
 801         x25->state = X25_STATE_1;
 802
 803         x25_write_internal(sk, X25_CALL_REQUEST);
 804
 805         x25_start_heartbeat(sk);
 806         x25_start_t21timer(sk);
 807
 808         /* Now the loop */
 809         rc = -EINPROGRESS;
 810         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 811                 goto out;
 812
 813         rc = x25_wait_for_connection_establishment(sk);
 814         if (rc)
 815                 goto out_put_neigh;
 816
 817         sock->state = SS_CONNECTED;
 818         rc = 0;
 819 out_put_neigh:
 820         if (rc && x25->neighbour) {
 821                 read_lock_bh(&x25_list_lock);
 822                 x25_neigh_put(x25->neighbour);
 823                 x25->neighbour = NULL;
 824                 read_unlock_bh(&x25_list_lock);
 825                 x25->state = X25_STATE_0;
 826         }
 827 out_put_route:
 828         x25_route_put(rt);
 829 out:
 830         release_sock(sk);
 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_sleep(sk), &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_sleep(sk), &wait);
 860         return rc;
 861 }
 862
 863 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 864                       bool kern)
 865 {
 866         struct sock *sk = sock->sk;
 867         struct sock *newsk;
 868         struct sk_buff *skb;
 869         int rc = -EINVAL;
 870
 871         if (!sk)
 872                 goto out;
 873
 874         rc = -EOPNOTSUPP;
 875         if (sk->sk_type != SOCK_SEQPACKET)
 876                 goto out;
 877
 878         lock_sock(sk);
 879         rc = -EINVAL;
 880         if (sk->sk_state != TCP_LISTEN)
 881                 goto out2;
 882
 883         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 884         if (rc)
 885                 goto out2;
 886         skb = skb_dequeue(&sk->sk_receive_queue);
 887         rc = -EINVAL;
 888         if (!skb->sk)
 889                 goto out2;
 890         newsk            = skb->sk;
 891         sock_graft(newsk, newsock);
 892
 893         /* Now attach up the new socket */
 894         skb->sk = NULL;
 895         kfree_skb(skb);
 896         sk_acceptq_removed(sk);
 897         newsock->state = SS_CONNECTED;
 898         rc = 0;
 899 out2:
 900         release_sock(sk);
 901 out:
 902         return rc;
 903 }
 904
 905 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 906                        int peer)
 907 {
 908         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 909         struct sock *sk = sock->sk;
 910         struct x25_sock *x25 = x25_sk(sk);
 911         int rc = 0;
 912
 913         if (peer) {
 914                 if (sk->sk_state != TCP_ESTABLISHED) {
 915                         rc = -ENOTCONN;
 916                         goto out;
 917                 }
 918                 sx25->sx25_addr = x25->dest_addr;
 919         } else
 920                 sx25->sx25_addr = x25->source_addr;
 921
 922         sx25->sx25_family = AF_X25;
 923         rc = sizeof(*sx25);
 924
 925 out:
 926         return rc;
 927 }
 928
 929 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 930                         unsigned int lci)
 931 {
 932         struct sock *sk;
 933         struct sock *make;
 934         struct x25_sock *makex25;
 935         struct x25_address source_addr, dest_addr;
 936         struct x25_facilities facilities;
 937         struct x25_dte_facilities dte_facilities;
 938         int len, addr_len, rc;
 939
 940         /*
 941          *      Remove the LCI and frame type.
 942          */
 943         skb_pull(skb, X25_STD_MIN_LEN);
 944
 945         /*
 946          *      Extract the X.25 addresses and convert them to ASCII strings,
 947          *      and remove them.
 948          *
 949          *      Address block is mandatory in call request packets
 950          */
 951         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 952         if (addr_len <= 0)
 953                 goto out_clear_request;
 954         skb_pull(skb, addr_len);
 955
 956         /*
 957          *      Get the length of the facilities, skip past them for the moment
 958          *      get the call user data because this is needed to determine
 959          *      the correct listener
 960          *
 961          *      Facilities length is mandatory in call request packets
 962          */
 963         if (!pskb_may_pull(skb, 1))
 964                 goto out_clear_request;
 965         len = skb->data[0] + 1;
 966         if (!pskb_may_pull(skb, len))
 967                 goto out_clear_request;
 968         skb_pull(skb,len);
 969
 970         /*
 971          *      Ensure that the amount of call user data is valid.
 972          */
 973         if (skb->len > X25_MAX_CUD_LEN)
 974                 goto out_clear_request;
 975
 976         /*
 977          *      Get all the call user data so it can be used in
 978          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 979          */
 980         if (!pskb_may_pull(skb, skb->len))
 981                 goto out_clear_request;
 982
 983         /*
 984          *      Find a listener for the particular address/cud pair.
 985          */
 986         sk = x25_find_listener(&source_addr,skb);
 987         skb_push(skb,len);
 988
 989         if (sk != NULL && sk_acceptq_is_full(sk)) {
 990                 goto out_sock_put;
 991         }
 992
 993         /*
 994          *      We dont have any listeners for this incoming call.
 995          *      Try forwarding it.
 996          */
 997         if (sk == NULL) {
 998                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
 999                 if (sysctl_x25_forward &&
1000                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1001                 {
1002                         /* Call was forwarded, dont process it any more */
1003                         kfree_skb(skb);
1004                         rc = 1;
1005                         goto out;
1006                 } else {
1007                         /* No listeners, can't forward, clear the call */
1008                         goto out_clear_request;
1009                 }
1010         }
1011
1012         /*
1013          *      Try to reach a compromise on the requested facilities.
1014          */
1015         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1016         if (len == -1)
1017                 goto out_sock_put;
1018
1019         /*
1020          * current neighbour/link might impose additional limits
1021          * on certain facilities
1022          */
1023
1024         x25_limit_facilities(&facilities, nb);
1025
1026         /*
1027          *      Try to create a new socket.
1028          */
1029         make = x25_make_new(sk);
1030         if (!make)
1031                 goto out_sock_put;
1032
1033         /*
1034          *      Remove the facilities
1035          */
1036         skb_pull(skb, len);
1037
1038         skb->sk     = make;
1039         make->sk_state = TCP_ESTABLISHED;
1040
1041         makex25 = x25_sk(make);
1042         makex25->lci           = lci;
1043         makex25->dest_addr     = dest_addr;
1044         makex25->source_addr   = source_addr;
1045         x25_neigh_hold(nb);
1046         makex25->neighbour     = nb;
1047         makex25->facilities    = facilities;
1048         makex25->dte_facilities= dte_facilities;
1049         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1050         /* ensure no reverse facil on accept */
1051         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1052         /* ensure no calling address extension on accept */
1053         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1054         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1055
1056         /* Normally all calls are accepted immediately */
1057         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1058                 x25_write_internal(make, X25_CALL_ACCEPTED);
1059                 makex25->state = X25_STATE_3;
1060         } else {
1061                 makex25->state = X25_STATE_5;
1062         }
1063
1064         /*
1065          *      Incoming Call User Data.
1066          */
1067         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1068         makex25->calluserdata.cudlength = skb->len;
1069
1070         sk_acceptq_added(sk);
1071
1072         x25_insert_socket(make);
1073
1074         skb_queue_head(&sk->sk_receive_queue, skb);
1075
1076         x25_start_heartbeat(make);
1077
1078         if (!sock_flag(sk, SOCK_DEAD))
1079                 sk->sk_data_ready(sk);
1080         rc = 1;
1081         sock_put(sk);
1082 out:
1083         return rc;
1084 out_sock_put:
1085         sock_put(sk);
1086 out_clear_request:
1087         rc = 0;
1088         x25_transmit_clear_request(nb, lci, 0x01);
1089         goto out;
1090 }
1091
1092 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1093 {
1094         struct sock *sk = sock->sk;
1095         struct x25_sock *x25 = x25_sk(sk);
1096         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1097         struct sockaddr_x25 sx25;
1098         struct sk_buff *skb;
1099         unsigned char *asmptr;
1100         int noblock = msg->msg_flags & MSG_DONTWAIT;
1101         size_t size;
1102         int qbit = 0, rc = -EINVAL;
1103
1104         lock_sock(sk);
1105         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1106                 goto out;
1107
1108         /* we currently don't support segmented records at the user interface */
1109         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1110                 goto out;
1111
1112         rc = -EADDRNOTAVAIL;
1113         if (sock_flag(sk, SOCK_ZAPPED))
1114                 goto out;
1115
1116         rc = -EPIPE;
1117         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1118                 send_sig(SIGPIPE, current, 0);
1119                 goto out;
1120         }
1121
1122         rc = -ENETUNREACH;
1123         if (!x25->neighbour)
1124                 goto out;
1125
1126         if (usx25) {
1127                 rc = -EINVAL;
1128                 if (msg->msg_namelen < sizeof(sx25))
1129                         goto out;
1130                 memcpy(&sx25, usx25, sizeof(sx25));
1131                 rc = -EISCONN;
1132                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1133                         goto out;
1134                 rc = -EINVAL;
1135                 if (sx25.sx25_family != AF_X25)
1136                         goto out;
1137         } else {
1138                 /*
1139                  *      FIXME 1003.1g - if the socket is like this because
1140                  *      it has become closed (not started closed) we ought
1141                  *      to SIGPIPE, EPIPE;
1142                  */
1143                 rc = -ENOTCONN;
1144                 if (sk->sk_state != TCP_ESTABLISHED)
1145                         goto out;
1146
1147                 sx25.sx25_family = AF_X25;
1148                 sx25.sx25_addr   = x25->dest_addr;
1149         }
1150
1151         /* Sanity check the packet size */
1152         if (len > 65535) {
1153                 rc = -EMSGSIZE;
1154                 goto out;
1155         }
1156
1157         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1158
1159         /* Build a packet */
1160         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1161
1162         if ((msg->msg_flags & MSG_OOB) && len > 32)
1163                 len = 32;
1164
1165         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1166
1167         release_sock(sk);
1168         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1169         lock_sock(sk);
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_from_msg(skb_transport_header(skb), msg, 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                 if (!pskb_may_pull(skb, 1))
1194                         goto out_kfree_skb;
1195
1196                 qbit = skb->data[0];
1197                 skb_pull(skb, 1);
1198         }
1199
1200         /*
1201          *      Push down the X.25 header
1202          */
1203         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1204
1205         if (msg->msg_flags & MSG_OOB) {
1206                 if (x25->neighbour->extended) {
1207                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1208                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1209                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1210                         *asmptr++ = X25_INTERRUPT;
1211                 } else {
1212                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1213                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1214                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1215                         *asmptr++ = X25_INTERRUPT;
1216                 }
1217         } else {
1218                 if (x25->neighbour->extended) {
1219                         /* Build an Extended X.25 header */
1220                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1221                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1222                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1223                         *asmptr++ = X25_DATA;
1224                         *asmptr++ = X25_DATA;
1225                 } else {
1226                         /* Build an Standard X.25 header */
1227                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1228                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1229                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1230                         *asmptr++ = X25_DATA;
1231                 }
1232
1233                 if (qbit)
1234                         skb->data[0] |= X25_Q_BIT;
1235         }
1236
1237         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1238         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1239
1240         rc = -ENOTCONN;
1241         if (sk->sk_state != TCP_ESTABLISHED)
1242                 goto out_kfree_skb;
1243
1244         if (msg->msg_flags & MSG_OOB)
1245                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1246         else {
1247                 rc = x25_output(sk, skb);
1248                 len = rc;
1249                 if (rc < 0)
1250                         kfree_skb(skb);
1251                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1252                         len++;
1253         }
1254
1255         x25_kick(sk);
1256         rc = len;
1257 out:
1258         release_sock(sk);
1259         return rc;
1260 out_kfree_skb:
1261         kfree_skb(skb);
1262         goto out;
1263 }
1264
1265
1266 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1267                        int flags)
1268 {
1269         struct sock *sk = sock->sk;
1270         struct x25_sock *x25 = x25_sk(sk);
1271         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1272         size_t copied;
1273         int qbit, header_len;
1274         struct sk_buff *skb;
1275         unsigned char *asmptr;
1276         int rc = -ENOTCONN;
1277
1278         lock_sock(sk);
1279
1280         if (x25->neighbour == NULL)
1281                 goto out;
1282
1283         header_len = x25->neighbour->extended ?
1284                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1285
1286         /*
1287          * This works for seqpacket too. The receiver has ordered the queue for
1288          * us! We do one quick check first though
1289          */
1290         if (sk->sk_state != TCP_ESTABLISHED)
1291                 goto out;
1292
1293         if (flags & MSG_OOB) {
1294                 rc = -EINVAL;
1295                 if (sock_flag(sk, SOCK_URGINLINE) ||
1296                     !skb_peek(&x25->interrupt_in_queue))
1297                         goto out;
1298
1299                 skb = skb_dequeue(&x25->interrupt_in_queue);
1300
1301                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1302                         goto out_free_dgram;
1303
1304                 skb_pull(skb, X25_STD_MIN_LEN);
1305
1306                 /*
1307                  *      No Q bit information on Interrupt data.
1308                  */
1309                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1310                         asmptr  = skb_push(skb, 1);
1311                         *asmptr = 0x00;
1312                 }
1313
1314                 msg->msg_flags |= MSG_OOB;
1315         } else {
1316                 /* Now we can treat all alike */
1317                 release_sock(sk);
1318                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1319                                         flags & MSG_DONTWAIT, &rc);
1320                 lock_sock(sk);
1321                 if (!skb)
1322                         goto out;
1323
1324                 if (!pskb_may_pull(skb, header_len))
1325                         goto out_free_dgram;
1326
1327                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1328
1329                 skb_pull(skb, header_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_msg(skb, 0, msg, 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                 msg->msg_namelen = sizeof(*sx25);
1356         }
1357
1358         x25_check_rbuf(sk);
1359         rc = copied;
1360 out_free_dgram:
1361         skb_free_datagram(sk, skb);
1362 out:
1363         release_sock(sk);
1364         return rc;
1365 }
1366
1367
1368 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1369 {
1370         struct sock *sk = sock->sk;
1371         struct x25_sock *x25 = x25_sk(sk);
1372         void __user *argp = (void __user *)arg;
1373         int rc;
1374
1375         switch (cmd) {
1376         case TIOCOUTQ: {
1377                 int amount;
1378
1379                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1380                 if (amount < 0)
1381                         amount = 0;
1382                 rc = put_user(amount, (unsigned int __user *)argp);
1383                 break;
1384         }
1385
1386         case TIOCINQ: {
1387                 struct sk_buff *skb;
1388                 int amount = 0;
1389                 /*
1390                  * These two are safe on a single CPU system as
1391                  * only user tasks fiddle here
1392                  */
1393                 lock_sock(sk);
1394                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1395                         amount = skb->len;
1396                 release_sock(sk);
1397                 rc = put_user(amount, (unsigned int __user *)argp);
1398                 break;
1399         }
1400
1401         case SIOCGIFADDR:
1402         case SIOCSIFADDR:
1403         case SIOCGIFDSTADDR:
1404         case SIOCSIFDSTADDR:
1405         case SIOCGIFBRDADDR:
1406         case SIOCSIFBRDADDR:
1407         case SIOCGIFNETMASK:
1408         case SIOCSIFNETMASK:
1409         case SIOCGIFMETRIC:
1410         case SIOCSIFMETRIC:
1411                 rc = -EINVAL;
1412                 break;
1413         case SIOCADDRT:
1414         case SIOCDELRT:
1415                 rc = -EPERM;
1416                 if (!capable(CAP_NET_ADMIN))
1417                         break;
1418                 rc = x25_route_ioctl(cmd, argp);
1419                 break;
1420         case SIOCX25GSUBSCRIP:
1421                 rc = x25_subscr_ioctl(cmd, argp);
1422                 break;
1423         case SIOCX25SSUBSCRIP:
1424                 rc = -EPERM;
1425                 if (!capable(CAP_NET_ADMIN))
1426                         break;
1427                 rc = x25_subscr_ioctl(cmd, argp);
1428                 break;
1429         case SIOCX25GFACILITIES: {
1430                 lock_sock(sk);
1431                 rc = copy_to_user(argp, &x25->facilities,
1432                                   sizeof(x25->facilities))
1433                         ? -EFAULT : 0;
1434                 release_sock(sk);
1435                 break;
1436         }
1437
1438         case SIOCX25SFACILITIES: {
1439                 struct x25_facilities facilities;
1440                 rc = -EFAULT;
1441                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1442                         break;
1443                 rc = -EINVAL;
1444                 lock_sock(sk);
1445                 if (sk->sk_state != TCP_LISTEN &&
1446                     sk->sk_state != TCP_CLOSE)
1447                         goto out_fac_release;
1448                 if (facilities.pacsize_in < X25_PS16 ||
1449                     facilities.pacsize_in > X25_PS4096)
1450                         goto out_fac_release;
1451                 if (facilities.pacsize_out < X25_PS16 ||
1452                     facilities.pacsize_out > X25_PS4096)
1453                         goto out_fac_release;
1454                 if (facilities.winsize_in < 1 ||
1455                     facilities.winsize_in > 127)
1456                         goto out_fac_release;
1457                 if (facilities.throughput) {
1458                         int out = facilities.throughput & 0xf0;
1459                         int in  = facilities.throughput & 0x0f;
1460                         if (!out)
1461                                 facilities.throughput |=
1462                                         X25_DEFAULT_THROUGHPUT << 4;
1463                         else if (out < 0x30 || out > 0xD0)
1464                                 goto out_fac_release;
1465                         if (!in)
1466                                 facilities.throughput |=
1467                                         X25_DEFAULT_THROUGHPUT;
1468                         else if (in < 0x03 || in > 0x0D)
1469                                 goto out_fac_release;
1470                 }
1471                 if (facilities.reverse &&
1472                     (facilities.reverse & 0x81) != 0x81)
1473                         goto out_fac_release;
1474                 x25->facilities = facilities;
1475                 rc = 0;
1476 out_fac_release:
1477                 release_sock(sk);
1478                 break;
1479         }
1480
1481         case SIOCX25GDTEFACILITIES: {
1482                 lock_sock(sk);
1483                 rc = copy_to_user(argp, &x25->dte_facilities,
1484                                   sizeof(x25->dte_facilities));
1485                 release_sock(sk);
1486                 if (rc)
1487                         rc = -EFAULT;
1488                 break;
1489         }
1490
1491         case SIOCX25SDTEFACILITIES: {
1492                 struct x25_dte_facilities dtefacs;
1493                 rc = -EFAULT;
1494                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1495                         break;
1496                 rc = -EINVAL;
1497                 lock_sock(sk);
1498                 if (sk->sk_state != TCP_LISTEN &&
1499                     sk->sk_state != TCP_CLOSE)
1500                         goto out_dtefac_release;
1501                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1502                         goto out_dtefac_release;
1503                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1504                         goto out_dtefac_release;
1505                 x25->dte_facilities = dtefacs;
1506                 rc = 0;
1507 out_dtefac_release:
1508                 release_sock(sk);
1509                 break;
1510         }
1511
1512         case SIOCX25GCALLUSERDATA: {
1513                 lock_sock(sk);
1514                 rc = copy_to_user(argp, &x25->calluserdata,
1515                                   sizeof(x25->calluserdata))
1516                         ? -EFAULT : 0;
1517                 release_sock(sk);
1518                 break;
1519         }
1520
1521         case SIOCX25SCALLUSERDATA: {
1522                 struct x25_calluserdata calluserdata;
1523
1524                 rc = -EFAULT;
1525                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1526                         break;
1527                 rc = -EINVAL;
1528                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1529                         break;
1530                 lock_sock(sk);
1531                 x25->calluserdata = calluserdata;
1532                 release_sock(sk);
1533                 rc = 0;
1534                 break;
1535         }
1536
1537         case SIOCX25GCAUSEDIAG: {
1538                 lock_sock(sk);
1539                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1540                         ? -EFAULT : 0;
1541                 release_sock(sk);
1542                 break;
1543         }
1544
1545         case SIOCX25SCAUSEDIAG: {
1546                 struct x25_causediag causediag;
1547                 rc = -EFAULT;
1548                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1549                         break;
1550                 lock_sock(sk);
1551                 x25->causediag = causediag;
1552                 release_sock(sk);
1553                 rc = 0;
1554                 break;
1555
1556         }
1557
1558         case SIOCX25SCUDMATCHLEN: {
1559                 struct x25_subaddr sub_addr;
1560                 rc = -EINVAL;
1561                 lock_sock(sk);
1562                 if(sk->sk_state != TCP_CLOSE)
1563                         goto out_cud_release;
1564                 rc = -EFAULT;
1565                 if (copy_from_user(&sub_addr, argp,
1566                                    sizeof(sub_addr)))
1567                         goto out_cud_release;
1568                 rc = -EINVAL;
1569                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1570                         goto out_cud_release;
1571                 x25->cudmatchlength = sub_addr.cudmatchlength;
1572                 rc = 0;
1573 out_cud_release:
1574                 release_sock(sk);
1575                 break;
1576         }
1577
1578         case SIOCX25CALLACCPTAPPRV: {
1579                 rc = -EINVAL;
1580                 lock_sock(sk);
1581                 if (sk->sk_state == TCP_CLOSE) {
1582                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1583                         rc = 0;
1584                 }
1585                 release_sock(sk);
1586                 break;
1587         }
1588
1589         case SIOCX25SENDCALLACCPT:  {
1590                 rc = -EINVAL;
1591                 lock_sock(sk);
1592                 if (sk->sk_state != TCP_ESTABLISHED)
1593                         goto out_sendcallaccpt_release;
1594                 /* must call accptapprv above */
1595                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1596                         goto out_sendcallaccpt_release;
1597                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1598                 x25->state = X25_STATE_3;
1599                 rc = 0;
1600 out_sendcallaccpt_release:
1601                 release_sock(sk);
1602                 break;
1603         }
1604
1605         default:
1606                 rc = -ENOIOCTLCMD;
1607                 break;
1608         }
1609
1610         return rc;
1611 }
1612
1613 static const struct net_proto_family x25_family_ops = {
1614         .family =       AF_X25,
1615         .create =       x25_create,
1616         .owner  =       THIS_MODULE,
1617 };
1618
1619 #ifdef CONFIG_COMPAT
1620 static int compat_x25_subscr_ioctl(unsigned int cmd,
1621                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1622 {
1623         struct compat_x25_subscrip_struct x25_subscr;
1624         struct x25_neigh *nb;
1625         struct net_device *dev;
1626         int rc = -EINVAL;
1627
1628         rc = -EFAULT;
1629         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1630                 goto out;
1631
1632         rc = -EINVAL;
1633         dev = x25_dev_get(x25_subscr.device);
1634         if (dev == NULL)
1635                 goto out;
1636
1637         nb = x25_get_neigh(dev);
1638         if (nb == NULL)
1639                 goto out_dev_put;
1640
1641         dev_put(dev);
1642
1643         if (cmd == SIOCX25GSUBSCRIP) {
1644                 read_lock_bh(&x25_neigh_list_lock);
1645                 x25_subscr.extended = nb->extended;
1646                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1647                 read_unlock_bh(&x25_neigh_list_lock);
1648                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1649                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1650         } else {
1651                 rc = -EINVAL;
1652                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1653                         rc = 0;
1654                         write_lock_bh(&x25_neigh_list_lock);
1655                         nb->extended = x25_subscr.extended;
1656                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1657                         write_unlock_bh(&x25_neigh_list_lock);
1658                 }
1659         }
1660         x25_neigh_put(nb);
1661 out:
1662         return rc;
1663 out_dev_put:
1664         dev_put(dev);
1665         goto out;
1666 }
1667
1668 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1669                                 unsigned long arg)
1670 {
1671         void __user *argp = compat_ptr(arg);
1672         int rc = -ENOIOCTLCMD;
1673
1674         switch(cmd) {
1675         case TIOCOUTQ:
1676         case TIOCINQ:
1677                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1678                 break;
1679         case SIOCGIFADDR:
1680         case SIOCSIFADDR:
1681         case SIOCGIFDSTADDR:
1682         case SIOCSIFDSTADDR:
1683         case SIOCGIFBRDADDR:
1684         case SIOCSIFBRDADDR:
1685         case SIOCGIFNETMASK:
1686         case SIOCSIFNETMASK:
1687         case SIOCGIFMETRIC:
1688         case SIOCSIFMETRIC:
1689                 rc = -EINVAL;
1690                 break;
1691         case SIOCADDRT:
1692         case SIOCDELRT:
1693                 rc = -EPERM;
1694                 if (!capable(CAP_NET_ADMIN))
1695                         break;
1696                 rc = x25_route_ioctl(cmd, argp);
1697                 break;
1698         case SIOCX25GSUBSCRIP:
1699                 rc = compat_x25_subscr_ioctl(cmd, argp);
1700                 break;
1701         case SIOCX25SSUBSCRIP:
1702                 rc = -EPERM;
1703                 if (!capable(CAP_NET_ADMIN))
1704                         break;
1705                 rc = compat_x25_subscr_ioctl(cmd, argp);
1706                 break;
1707         case SIOCX25GFACILITIES:
1708         case SIOCX25SFACILITIES:
1709         case SIOCX25GDTEFACILITIES:
1710         case SIOCX25SDTEFACILITIES:
1711         case SIOCX25GCALLUSERDATA:
1712         case SIOCX25SCALLUSERDATA:
1713         case SIOCX25GCAUSEDIAG:
1714         case SIOCX25SCAUSEDIAG:
1715         case SIOCX25SCUDMATCHLEN:
1716         case SIOCX25CALLACCPTAPPRV:
1717         case SIOCX25SENDCALLACCPT:
1718                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1719                 break;
1720         default:
1721                 rc = -ENOIOCTLCMD;
1722                 break;
1723         }
1724         return rc;
1725 }
1726 #endif
1727
1728 static const struct proto_ops x25_proto_ops = {
1729         .family =       AF_X25,
1730         .owner =        THIS_MODULE,
1731         .release =      x25_release,
1732         .bind =         x25_bind,
1733         .connect =      x25_connect,
1734         .socketpair =   sock_no_socketpair,
1735         .accept =       x25_accept,
1736         .getname =      x25_getname,
1737         .poll =         datagram_poll,
1738         .ioctl =        x25_ioctl,
1739 #ifdef CONFIG_COMPAT
1740         .compat_ioctl = compat_x25_ioctl,
1741 #endif
1742         .gettstamp =    sock_gettstamp,
1743         .listen =       x25_listen,
1744         .shutdown =     sock_no_shutdown,
1745         .setsockopt =   x25_setsockopt,
1746         .getsockopt =   x25_getsockopt,
1747         .sendmsg =      x25_sendmsg,
1748         .recvmsg =      x25_recvmsg,
1749         .mmap =         sock_no_mmap,
1750         .sendpage =     sock_no_sendpage,
1751 };
1752
1753 static struct packet_type x25_packet_type __read_mostly = {
1754         .type = cpu_to_be16(ETH_P_X25),
1755         .func = x25_lapb_receive_frame,
1756 };
1757
1758 static struct notifier_block x25_dev_notifier = {
1759         .notifier_call = x25_device_event,
1760 };
1761
1762 void x25_kill_by_neigh(struct x25_neigh *nb)
1763 {
1764         struct sock *s;
1765
1766         write_lock_bh(&x25_list_lock);
1767
1768         sk_for_each(s, &x25_list)
1769                 if (x25_sk(s)->neighbour == nb)
1770                         x25_disconnect(s, ENETUNREACH, 0, 0);
1771
1772         write_unlock_bh(&x25_list_lock);
1773
1774         /* Remove any related forwards */
1775         x25_clear_forward_by_dev(nb->dev);
1776 }
1777
1778 static int __init x25_init(void)
1779 {
1780         int rc;
1781
1782         rc = proto_register(&x25_proto, 0);
1783         if (rc)
1784                 goto out;
1785
1786         rc = sock_register(&x25_family_ops);
1787         if (rc)
1788                 goto out_proto;
1789
1790         dev_add_pack(&x25_packet_type);
1791
1792         rc = register_netdevice_notifier(&x25_dev_notifier);
1793         if (rc)
1794                 goto out_sock;
1795
1796         rc = x25_register_sysctl();
1797         if (rc)
1798                 goto out_dev;
1799
1800         rc = x25_proc_init();
1801         if (rc)
1802                 goto out_sysctl;
1803
1804         pr_info("Linux Version 0.2\n");
1805
1806 out:
1807         return rc;
1808 out_sysctl:
1809         x25_unregister_sysctl();
1810 out_dev:
1811         unregister_netdevice_notifier(&x25_dev_notifier);
1812 out_sock:
1813         dev_remove_pack(&x25_packet_type);
1814         sock_unregister(AF_X25);
1815 out_proto:
1816         proto_unregister(&x25_proto);
1817         goto out;
1818 }
1819 module_init(x25_init);
1820
1821 static void __exit x25_exit(void)
1822 {
1823         x25_proc_exit();
1824         x25_link_free();
1825         x25_route_free();
1826
1827         x25_unregister_sysctl();
1828
1829         unregister_netdevice_notifier(&x25_dev_notifier);
1830
1831         dev_remove_pack(&x25_packet_type);
1832
1833         sock_unregister(AF_X25);
1834         proto_unregister(&x25_proto);
1835 }
1836 module_exit(x25_exit);
1837
1838 MODULE_AUTHOR("Jonathan Naylor <[email protected]>");
1839 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1840 MODULE_LICENSE("GPL");
1841 MODULE_ALIAS_NETPROTO(PF_X25);