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 = -ENOTCONN;
 723                 if (sk->sk_state == TCP_CLOSE) {
 724                         sk->sk_socket->state = SS_UNCONNECTED;
 725                         break;
 726                 }
 727                 rc = 0;
 728                 if (sk->sk_state != TCP_ESTABLISHED) {
 729                         release_sock(sk);
 730                         schedule();
 731                         lock_sock(sk);
 732                 } else
 733                         break;
 734         }
 735         __set_current_state(TASK_RUNNING);
 736         remove_wait_queue(sk_sleep(sk), &wait);
 737         return rc;
 738 }
 739
 740 static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 741                        int addr_len, int flags)
 742 {
 743         struct sock *sk = sock->sk;
 744         struct x25_sock *x25 = x25_sk(sk);
 745         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 746         struct x25_route *rt;
 747         int rc = 0;
 748
 749         lock_sock(sk);
 750         if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 751                 sock->state = SS_CONNECTED;
 752                 goto out; /* Connect completed during a ERESTARTSYS event */
 753         }
 754
 755         rc = -ECONNREFUSED;
 756         if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 757                 sock->state = SS_UNCONNECTED;
 758                 goto out;
 759         }
 760
 761         rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 762         if (sk->sk_state == TCP_ESTABLISHED)
 763                 goto out;
 764
 765         rc = -EALREADY; /* Do nothing if call is already in progress */
 766         if (sk->sk_state == TCP_SYN_SENT)
 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             strnlen(addr->sx25_addr.x25_addr, X25_ADDR_LEN) == X25_ADDR_LEN)
 776                 goto out;
 777
 778         rc = -ENETUNREACH;
 779         rt = x25_get_route(&addr->sx25_addr);
 780         if (!rt)
 781                 goto out;
 782
 783         x25->neighbour = x25_get_neigh(rt->dev);
 784         if (!x25->neighbour)
 785                 goto out_put_route;
 786
 787         x25_limit_facilities(&x25->facilities, x25->neighbour);
 788
 789         x25->lci = x25_new_lci(x25->neighbour);
 790         if (!x25->lci)
 791                 goto out_put_neigh;
 792
 793         rc = -EINVAL;
 794         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 795                 goto out_put_neigh;
 796
 797         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 798                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 799
 800         x25->dest_addr = addr->sx25_addr;
 801
 802         /* Move to connecting socket, start sending Connect Requests */
 803         sock->state   = SS_CONNECTING;
 804         sk->sk_state  = TCP_SYN_SENT;
 805
 806         x25->state = X25_STATE_1;
 807
 808         x25_write_internal(sk, X25_CALL_REQUEST);
 809
 810         x25_start_heartbeat(sk);
 811         x25_start_t21timer(sk);
 812
 813         /* Now the loop */
 814         rc = -EINPROGRESS;
 815         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 816                 goto out;
 817
 818         rc = x25_wait_for_connection_establishment(sk);
 819         if (rc)
 820                 goto out_put_neigh;
 821
 822         sock->state = SS_CONNECTED;
 823         rc = 0;
 824 out_put_neigh:
 825         if (rc && x25->neighbour) {
 826                 read_lock_bh(&x25_list_lock);
 827                 x25_neigh_put(x25->neighbour);
 828                 x25->neighbour = NULL;
 829                 read_unlock_bh(&x25_list_lock);
 830                 x25->state = X25_STATE_0;
 831         }
 832 out_put_route:
 833         x25_route_put(rt);
 834 out:
 835         release_sock(sk);
 836         return rc;
 837 }
 838
 839 static int x25_wait_for_data(struct sock *sk, long timeout)
 840 {
 841         DECLARE_WAITQUEUE(wait, current);
 842         int rc = 0;
 843
 844         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 845         for (;;) {
 846                 __set_current_state(TASK_INTERRUPTIBLE);
 847                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 848                         break;
 849                 rc = -ERESTARTSYS;
 850                 if (signal_pending(current))
 851                         break;
 852                 rc = -EAGAIN;
 853                 if (!timeout)
 854                         break;
 855                 rc = 0;
 856                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 857                         release_sock(sk);
 858                         timeout = schedule_timeout(timeout);
 859                         lock_sock(sk);
 860                 } else
 861                         break;
 862         }
 863         __set_current_state(TASK_RUNNING);
 864         remove_wait_queue(sk_sleep(sk), &wait);
 865         return rc;
 866 }
 867
 868 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 869                       bool kern)
 870 {
 871         struct sock *sk = sock->sk;
 872         struct sock *newsk;
 873         struct sk_buff *skb;
 874         int rc = -EINVAL;
 875
 876         if (!sk)
 877                 goto out;
 878
 879         rc = -EOPNOTSUPP;
 880         if (sk->sk_type != SOCK_SEQPACKET)
 881                 goto out;
 882
 883         lock_sock(sk);
 884         rc = -EINVAL;
 885         if (sk->sk_state != TCP_LISTEN)
 886                 goto out2;
 887
 888         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 889         if (rc)
 890                 goto out2;
 891         skb = skb_dequeue(&sk->sk_receive_queue);
 892         rc = -EINVAL;
 893         if (!skb->sk)
 894                 goto out2;
 895         newsk            = skb->sk;
 896         sock_graft(newsk, newsock);
 897
 898         /* Now attach up the new socket */
 899         skb->sk = NULL;
 900         kfree_skb(skb);
 901         sk_acceptq_removed(sk);
 902         newsock->state = SS_CONNECTED;
 903         rc = 0;
 904 out2:
 905         release_sock(sk);
 906 out:
 907         return rc;
 908 }
 909
 910 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 911                        int peer)
 912 {
 913         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 914         struct sock *sk = sock->sk;
 915         struct x25_sock *x25 = x25_sk(sk);
 916         int rc = 0;
 917
 918         if (peer) {
 919                 if (sk->sk_state != TCP_ESTABLISHED) {
 920                         rc = -ENOTCONN;
 921                         goto out;
 922                 }
 923                 sx25->sx25_addr = x25->dest_addr;
 924         } else
 925                 sx25->sx25_addr = x25->source_addr;
 926
 927         sx25->sx25_family = AF_X25;
 928         rc = sizeof(*sx25);
 929
 930 out:
 931         return rc;
 932 }
 933
 934 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 935                         unsigned int lci)
 936 {
 937         struct sock *sk;
 938         struct sock *make;
 939         struct x25_sock *makex25;
 940         struct x25_address source_addr, dest_addr;
 941         struct x25_facilities facilities;
 942         struct x25_dte_facilities dte_facilities;
 943         int len, addr_len, rc;
 944
 945         /*
 946          *      Remove the LCI and frame type.
 947          */
 948         skb_pull(skb, X25_STD_MIN_LEN);
 949
 950         /*
 951          *      Extract the X.25 addresses and convert them to ASCII strings,
 952          *      and remove them.
 953          *
 954          *      Address block is mandatory in call request packets
 955          */
 956         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 957         if (addr_len <= 0)
 958                 goto out_clear_request;
 959         skb_pull(skb, addr_len);
 960
 961         /*
 962          *      Get the length of the facilities, skip past them for the moment
 963          *      get the call user data because this is needed to determine
 964          *      the correct listener
 965          *
 966          *      Facilities length is mandatory in call request packets
 967          */
 968         if (!pskb_may_pull(skb, 1))
 969                 goto out_clear_request;
 970         len = skb->data[0] + 1;
 971         if (!pskb_may_pull(skb, len))
 972                 goto out_clear_request;
 973         skb_pull(skb,len);
 974
 975         /*
 976          *      Ensure that the amount of call user data is valid.
 977          */
 978         if (skb->len > X25_MAX_CUD_LEN)
 979                 goto out_clear_request;
 980
 981         /*
 982          *      Get all the call user data so it can be used in
 983          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 984          */
 985         if (!pskb_may_pull(skb, skb->len))
 986                 goto out_clear_request;
 987
 988         /*
 989          *      Find a listener for the particular address/cud pair.
 990          */
 991         sk = x25_find_listener(&source_addr,skb);
 992         skb_push(skb,len);
 993
 994         if (sk != NULL && sk_acceptq_is_full(sk)) {
 995                 goto out_sock_put;
 996         }
 997
 998         /*
 999          *      We dont have any listeners for this incoming call.
1000          *      Try forwarding it.
1001          */
1002         if (sk == NULL) {
1003                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1004                 if (sysctl_x25_forward &&
1005                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1006                 {
1007                         /* Call was forwarded, dont process it any more */
1008                         kfree_skb(skb);
1009                         rc = 1;
1010                         goto out;
1011                 } else {
1012                         /* No listeners, can't forward, clear the call */
1013                         goto out_clear_request;
1014                 }
1015         }
1016
1017         /*
1018          *      Try to reach a compromise on the requested facilities.
1019          */
1020         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1021         if (len == -1)
1022                 goto out_sock_put;
1023
1024         /*
1025          * current neighbour/link might impose additional limits
1026          * on certain facilities
1027          */
1028
1029         x25_limit_facilities(&facilities, nb);
1030
1031         /*
1032          *      Try to create a new socket.
1033          */
1034         make = x25_make_new(sk);
1035         if (!make)
1036                 goto out_sock_put;
1037
1038         /*
1039          *      Remove the facilities
1040          */
1041         skb_pull(skb, len);
1042
1043         skb->sk     = make;
1044         make->sk_state = TCP_ESTABLISHED;
1045
1046         makex25 = x25_sk(make);
1047         makex25->lci           = lci;
1048         makex25->dest_addr     = dest_addr;
1049         makex25->source_addr   = source_addr;
1050         x25_neigh_hold(nb);
1051         makex25->neighbour     = nb;
1052         makex25->facilities    = facilities;
1053         makex25->dte_facilities= dte_facilities;
1054         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1055         /* ensure no reverse facil on accept */
1056         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1057         /* ensure no calling address extension on accept */
1058         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1059         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1060
1061         /* Normally all calls are accepted immediately */
1062         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1063                 x25_write_internal(make, X25_CALL_ACCEPTED);
1064                 makex25->state = X25_STATE_3;
1065         } else {
1066                 makex25->state = X25_STATE_5;
1067         }
1068
1069         /*
1070          *      Incoming Call User Data.
1071          */
1072         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1073         makex25->calluserdata.cudlength = skb->len;
1074
1075         sk_acceptq_added(sk);
1076
1077         x25_insert_socket(make);
1078
1079         skb_queue_head(&sk->sk_receive_queue, skb);
1080
1081         x25_start_heartbeat(make);
1082
1083         if (!sock_flag(sk, SOCK_DEAD))
1084                 sk->sk_data_ready(sk);
1085         rc = 1;
1086         sock_put(sk);
1087 out:
1088         return rc;
1089 out_sock_put:
1090         sock_put(sk);
1091 out_clear_request:
1092         rc = 0;
1093         x25_transmit_clear_request(nb, lci, 0x01);
1094         goto out;
1095 }
1096
1097 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1098 {
1099         struct sock *sk = sock->sk;
1100         struct x25_sock *x25 = x25_sk(sk);
1101         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1102         struct sockaddr_x25 sx25;
1103         struct sk_buff *skb;
1104         unsigned char *asmptr;
1105         int noblock = msg->msg_flags & MSG_DONTWAIT;
1106         size_t size;
1107         int qbit = 0, rc = -EINVAL;
1108
1109         lock_sock(sk);
1110         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1111                 goto out;
1112
1113         /* we currently don't support segmented records at the user interface */
1114         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1115                 goto out;
1116
1117         rc = -EADDRNOTAVAIL;
1118         if (sock_flag(sk, SOCK_ZAPPED))
1119                 goto out;
1120
1121         rc = -EPIPE;
1122         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1123                 send_sig(SIGPIPE, current, 0);
1124                 goto out;
1125         }
1126
1127         rc = -ENETUNREACH;
1128         if (!x25->neighbour)
1129                 goto out;
1130
1131         if (usx25) {
1132                 rc = -EINVAL;
1133                 if (msg->msg_namelen < sizeof(sx25))
1134                         goto out;
1135                 memcpy(&sx25, usx25, sizeof(sx25));
1136                 rc = -EISCONN;
1137                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1138                         goto out;
1139                 rc = -EINVAL;
1140                 if (sx25.sx25_family != AF_X25)
1141                         goto out;
1142         } else {
1143                 /*
1144                  *      FIXME 1003.1g - if the socket is like this because
1145                  *      it has become closed (not started closed) we ought
1146                  *      to SIGPIPE, EPIPE;
1147                  */
1148                 rc = -ENOTCONN;
1149                 if (sk->sk_state != TCP_ESTABLISHED)
1150                         goto out;
1151
1152                 sx25.sx25_family = AF_X25;
1153                 sx25.sx25_addr   = x25->dest_addr;
1154         }
1155
1156         /* Sanity check the packet size */
1157         if (len > 65535) {
1158                 rc = -EMSGSIZE;
1159                 goto out;
1160         }
1161
1162         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1163
1164         /* Build a packet */
1165         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1166
1167         if ((msg->msg_flags & MSG_OOB) && len > 32)
1168                 len = 32;
1169
1170         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1171
1172         release_sock(sk);
1173         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1174         lock_sock(sk);
1175         if (!skb)
1176                 goto out;
1177         X25_SKB_CB(skb)->flags = msg->msg_flags;
1178
1179         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1180
1181         /*
1182          *      Put the data on the end
1183          */
1184         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1185
1186         skb_reset_transport_header(skb);
1187         skb_put(skb, len);
1188
1189         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1190         if (rc)
1191                 goto out_kfree_skb;
1192
1193         /*
1194          *      If the Q BIT Include socket option is in force, the first
1195          *      byte of the user data is the logical value of the Q Bit.
1196          */
1197         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1198                 if (!pskb_may_pull(skb, 1))
1199                         goto out_kfree_skb;
1200
1201                 qbit = skb->data[0];
1202                 skb_pull(skb, 1);
1203         }
1204
1205         /*
1206          *      Push down the X.25 header
1207          */
1208         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1209
1210         if (msg->msg_flags & MSG_OOB) {
1211                 if (x25->neighbour->extended) {
1212                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1213                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1214                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1215                         *asmptr++ = X25_INTERRUPT;
1216                 } else {
1217                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1218                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1219                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1220                         *asmptr++ = X25_INTERRUPT;
1221                 }
1222         } else {
1223                 if (x25->neighbour->extended) {
1224                         /* Build an Extended X.25 header */
1225                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1226                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1227                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1228                         *asmptr++ = X25_DATA;
1229                         *asmptr++ = X25_DATA;
1230                 } else {
1231                         /* Build an Standard X.25 header */
1232                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1233                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1234                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1235                         *asmptr++ = X25_DATA;
1236                 }
1237
1238                 if (qbit)
1239                         skb->data[0] |= X25_Q_BIT;
1240         }
1241
1242         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1243         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1244
1245         rc = -ENOTCONN;
1246         if (sk->sk_state != TCP_ESTABLISHED)
1247                 goto out_kfree_skb;
1248
1249         if (msg->msg_flags & MSG_OOB)
1250                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1251         else {
1252                 rc = x25_output(sk, skb);
1253                 len = rc;
1254                 if (rc < 0)
1255                         kfree_skb(skb);
1256                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1257                         len++;
1258         }
1259
1260         x25_kick(sk);
1261         rc = len;
1262 out:
1263         release_sock(sk);
1264         return rc;
1265 out_kfree_skb:
1266         kfree_skb(skb);
1267         goto out;
1268 }
1269
1270
1271 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1272                        int flags)
1273 {
1274         struct sock *sk = sock->sk;
1275         struct x25_sock *x25 = x25_sk(sk);
1276         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1277         size_t copied;
1278         int qbit, header_len;
1279         struct sk_buff *skb;
1280         unsigned char *asmptr;
1281         int rc = -ENOTCONN;
1282
1283         lock_sock(sk);
1284
1285         if (x25->neighbour == NULL)
1286                 goto out;
1287
1288         header_len = x25->neighbour->extended ?
1289                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1290
1291         /*
1292          * This works for seqpacket too. The receiver has ordered the queue for
1293          * us! We do one quick check first though
1294          */
1295         if (sk->sk_state != TCP_ESTABLISHED)
1296                 goto out;
1297
1298         if (flags & MSG_OOB) {
1299                 rc = -EINVAL;
1300                 if (sock_flag(sk, SOCK_URGINLINE) ||
1301                     !skb_peek(&x25->interrupt_in_queue))
1302                         goto out;
1303
1304                 skb = skb_dequeue(&x25->interrupt_in_queue);
1305
1306                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1307                         goto out_free_dgram;
1308
1309                 skb_pull(skb, X25_STD_MIN_LEN);
1310
1311                 /*
1312                  *      No Q bit information on Interrupt data.
1313                  */
1314                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1315                         asmptr  = skb_push(skb, 1);
1316                         *asmptr = 0x00;
1317                 }
1318
1319                 msg->msg_flags |= MSG_OOB;
1320         } else {
1321                 /* Now we can treat all alike */
1322                 release_sock(sk);
1323                 skb = skb_recv_datagram(sk, flags, &rc);
1324                 lock_sock(sk);
1325                 if (!skb)
1326                         goto out;
1327
1328                 if (!pskb_may_pull(skb, header_len))
1329                         goto out_free_dgram;
1330
1331                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1332
1333                 skb_pull(skb, header_len);
1334
1335                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1336                         asmptr  = skb_push(skb, 1);
1337                         *asmptr = qbit;
1338                 }
1339         }
1340
1341         skb_reset_transport_header(skb);
1342         copied = skb->len;
1343
1344         if (copied > size) {
1345                 copied = size;
1346                 msg->msg_flags |= MSG_TRUNC;
1347         }
1348
1349         /* Currently, each datagram always contains a complete record */
1350         msg->msg_flags |= MSG_EOR;
1351
1352         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1353         if (rc)
1354                 goto out_free_dgram;
1355
1356         if (sx25) {
1357                 sx25->sx25_family = AF_X25;
1358                 sx25->sx25_addr   = x25->dest_addr;
1359                 msg->msg_namelen = sizeof(*sx25);
1360         }
1361
1362         x25_check_rbuf(sk);
1363         rc = copied;
1364 out_free_dgram:
1365         skb_free_datagram(sk, skb);
1366 out:
1367         release_sock(sk);
1368         return rc;
1369 }
1370
1371
1372 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1373 {
1374         struct sock *sk = sock->sk;
1375         struct x25_sock *x25 = x25_sk(sk);
1376         void __user *argp = (void __user *)arg;
1377         int rc;
1378
1379         switch (cmd) {
1380         case TIOCOUTQ: {
1381                 int amount;
1382
1383                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1384                 if (amount < 0)
1385                         amount = 0;
1386                 rc = put_user(amount, (unsigned int __user *)argp);
1387                 break;
1388         }
1389
1390         case TIOCINQ: {
1391                 struct sk_buff *skb;
1392                 int amount = 0;
1393                 /*
1394                  * These two are safe on a single CPU system as
1395                  * only user tasks fiddle here
1396                  */
1397                 lock_sock(sk);
1398                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1399                         amount = skb->len;
1400                 release_sock(sk);
1401                 rc = put_user(amount, (unsigned int __user *)argp);
1402                 break;
1403         }
1404
1405         case SIOCGIFADDR:
1406         case SIOCSIFADDR:
1407         case SIOCGIFDSTADDR:
1408         case SIOCSIFDSTADDR:
1409         case SIOCGIFBRDADDR:
1410         case SIOCSIFBRDADDR:
1411         case SIOCGIFNETMASK:
1412         case SIOCSIFNETMASK:
1413         case SIOCGIFMETRIC:
1414         case SIOCSIFMETRIC:
1415                 rc = -EINVAL;
1416                 break;
1417         case SIOCADDRT:
1418         case SIOCDELRT:
1419                 rc = -EPERM;
1420                 if (!capable(CAP_NET_ADMIN))
1421                         break;
1422                 rc = x25_route_ioctl(cmd, argp);
1423                 break;
1424         case SIOCX25GSUBSCRIP:
1425                 rc = x25_subscr_ioctl(cmd, argp);
1426                 break;
1427         case SIOCX25SSUBSCRIP:
1428                 rc = -EPERM;
1429                 if (!capable(CAP_NET_ADMIN))
1430                         break;
1431                 rc = x25_subscr_ioctl(cmd, argp);
1432                 break;
1433         case SIOCX25GFACILITIES: {
1434                 lock_sock(sk);
1435                 rc = copy_to_user(argp, &x25->facilities,
1436                                   sizeof(x25->facilities))
1437                         ? -EFAULT : 0;
1438                 release_sock(sk);
1439                 break;
1440         }
1441
1442         case SIOCX25SFACILITIES: {
1443                 struct x25_facilities facilities;
1444                 rc = -EFAULT;
1445                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1446                         break;
1447                 rc = -EINVAL;
1448                 lock_sock(sk);
1449                 if (sk->sk_state != TCP_LISTEN &&
1450                     sk->sk_state != TCP_CLOSE)
1451                         goto out_fac_release;
1452                 if (facilities.pacsize_in < X25_PS16 ||
1453                     facilities.pacsize_in > X25_PS4096)
1454                         goto out_fac_release;
1455                 if (facilities.pacsize_out < X25_PS16 ||
1456                     facilities.pacsize_out > X25_PS4096)
1457                         goto out_fac_release;
1458                 if (facilities.winsize_in < 1 ||
1459                     facilities.winsize_in > 127)
1460                         goto out_fac_release;
1461                 if (facilities.throughput) {
1462                         int out = facilities.throughput & 0xf0;
1463                         int in  = facilities.throughput & 0x0f;
1464                         if (!out)
1465                                 facilities.throughput |=
1466                                         X25_DEFAULT_THROUGHPUT << 4;
1467                         else if (out < 0x30 || out > 0xD0)
1468                                 goto out_fac_release;
1469                         if (!in)
1470                                 facilities.throughput |=
1471                                         X25_DEFAULT_THROUGHPUT;
1472                         else if (in < 0x03 || in > 0x0D)
1473                                 goto out_fac_release;
1474                 }
1475                 if (facilities.reverse &&
1476                     (facilities.reverse & 0x81) != 0x81)
1477                         goto out_fac_release;
1478                 x25->facilities = facilities;
1479                 rc = 0;
1480 out_fac_release:
1481                 release_sock(sk);
1482                 break;
1483         }
1484
1485         case SIOCX25GDTEFACILITIES: {
1486                 lock_sock(sk);
1487                 rc = copy_to_user(argp, &x25->dte_facilities,
1488                                   sizeof(x25->dte_facilities));
1489                 release_sock(sk);
1490                 if (rc)
1491                         rc = -EFAULT;
1492                 break;
1493         }
1494
1495         case SIOCX25SDTEFACILITIES: {
1496                 struct x25_dte_facilities dtefacs;
1497                 rc = -EFAULT;
1498                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1499                         break;
1500                 rc = -EINVAL;
1501                 lock_sock(sk);
1502                 if (sk->sk_state != TCP_LISTEN &&
1503                     sk->sk_state != TCP_CLOSE)
1504                         goto out_dtefac_release;
1505                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1506                         goto out_dtefac_release;
1507                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1508                         goto out_dtefac_release;
1509                 x25->dte_facilities = dtefacs;
1510                 rc = 0;
1511 out_dtefac_release:
1512                 release_sock(sk);
1513                 break;
1514         }
1515
1516         case SIOCX25GCALLUSERDATA: {
1517                 lock_sock(sk);
1518                 rc = copy_to_user(argp, &x25->calluserdata,
1519                                   sizeof(x25->calluserdata))
1520                         ? -EFAULT : 0;
1521                 release_sock(sk);
1522                 break;
1523         }
1524
1525         case SIOCX25SCALLUSERDATA: {
1526                 struct x25_calluserdata calluserdata;
1527
1528                 rc = -EFAULT;
1529                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1530                         break;
1531                 rc = -EINVAL;
1532                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1533                         break;
1534                 lock_sock(sk);
1535                 x25->calluserdata = calluserdata;
1536                 release_sock(sk);
1537                 rc = 0;
1538                 break;
1539         }
1540
1541         case SIOCX25GCAUSEDIAG: {
1542                 lock_sock(sk);
1543                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1544                         ? -EFAULT : 0;
1545                 release_sock(sk);
1546                 break;
1547         }
1548
1549         case SIOCX25SCAUSEDIAG: {
1550                 struct x25_causediag causediag;
1551                 rc = -EFAULT;
1552                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1553                         break;
1554                 lock_sock(sk);
1555                 x25->causediag = causediag;
1556                 release_sock(sk);
1557                 rc = 0;
1558                 break;
1559
1560         }
1561
1562         case SIOCX25SCUDMATCHLEN: {
1563                 struct x25_subaddr sub_addr;
1564                 rc = -EINVAL;
1565                 lock_sock(sk);
1566                 if(sk->sk_state != TCP_CLOSE)
1567                         goto out_cud_release;
1568                 rc = -EFAULT;
1569                 if (copy_from_user(&sub_addr, argp,
1570                                    sizeof(sub_addr)))
1571                         goto out_cud_release;
1572                 rc = -EINVAL;
1573                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1574                         goto out_cud_release;
1575                 x25->cudmatchlength = sub_addr.cudmatchlength;
1576                 rc = 0;
1577 out_cud_release:
1578                 release_sock(sk);
1579                 break;
1580         }
1581
1582         case SIOCX25CALLACCPTAPPRV: {
1583                 rc = -EINVAL;
1584                 lock_sock(sk);
1585                 if (sk->sk_state == TCP_CLOSE) {
1586                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1587                         rc = 0;
1588                 }
1589                 release_sock(sk);
1590                 break;
1591         }
1592
1593         case SIOCX25SENDCALLACCPT:  {
1594                 rc = -EINVAL;
1595                 lock_sock(sk);
1596                 if (sk->sk_state != TCP_ESTABLISHED)
1597                         goto out_sendcallaccpt_release;
1598                 /* must call accptapprv above */
1599                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1600                         goto out_sendcallaccpt_release;
1601                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1602                 x25->state = X25_STATE_3;
1603                 rc = 0;
1604 out_sendcallaccpt_release:
1605                 release_sock(sk);
1606                 break;
1607         }
1608
1609         default:
1610                 rc = -ENOIOCTLCMD;
1611                 break;
1612         }
1613
1614         return rc;
1615 }
1616
1617 static const struct net_proto_family x25_family_ops = {
1618         .family =       AF_X25,
1619         .create =       x25_create,
1620         .owner  =       THIS_MODULE,
1621 };
1622
1623 #ifdef CONFIG_COMPAT
1624 static int compat_x25_subscr_ioctl(unsigned int cmd,
1625                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1626 {
1627         struct compat_x25_subscrip_struct x25_subscr;
1628         struct x25_neigh *nb;
1629         struct net_device *dev;
1630         int rc = -EINVAL;
1631
1632         rc = -EFAULT;
1633         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1634                 goto out;
1635
1636         rc = -EINVAL;
1637         dev = x25_dev_get(x25_subscr.device);
1638         if (dev == NULL)
1639                 goto out;
1640
1641         nb = x25_get_neigh(dev);
1642         if (nb == NULL)
1643                 goto out_dev_put;
1644
1645         dev_put(dev);
1646
1647         if (cmd == SIOCX25GSUBSCRIP) {
1648                 read_lock_bh(&x25_neigh_list_lock);
1649                 x25_subscr.extended = nb->extended;
1650                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1651                 read_unlock_bh(&x25_neigh_list_lock);
1652                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1653                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1654         } else {
1655                 rc = -EINVAL;
1656                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1657                         rc = 0;
1658                         write_lock_bh(&x25_neigh_list_lock);
1659                         nb->extended = x25_subscr.extended;
1660                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1661                         write_unlock_bh(&x25_neigh_list_lock);
1662                 }
1663         }
1664         x25_neigh_put(nb);
1665 out:
1666         return rc;
1667 out_dev_put:
1668         dev_put(dev);
1669         goto out;
1670 }
1671
1672 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1673                                 unsigned long arg)
1674 {
1675         void __user *argp = compat_ptr(arg);
1676         int rc = -ENOIOCTLCMD;
1677
1678         switch(cmd) {
1679         case TIOCOUTQ:
1680         case TIOCINQ:
1681                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1682                 break;
1683         case SIOCGIFADDR:
1684         case SIOCSIFADDR:
1685         case SIOCGIFDSTADDR:
1686         case SIOCSIFDSTADDR:
1687         case SIOCGIFBRDADDR:
1688         case SIOCSIFBRDADDR:
1689         case SIOCGIFNETMASK:
1690         case SIOCSIFNETMASK:
1691         case SIOCGIFMETRIC:
1692         case SIOCSIFMETRIC:
1693                 rc = -EINVAL;
1694                 break;
1695         case SIOCADDRT:
1696         case SIOCDELRT:
1697                 rc = -EPERM;
1698                 if (!capable(CAP_NET_ADMIN))
1699                         break;
1700                 rc = x25_route_ioctl(cmd, argp);
1701                 break;
1702         case SIOCX25GSUBSCRIP:
1703                 rc = compat_x25_subscr_ioctl(cmd, argp);
1704                 break;
1705         case SIOCX25SSUBSCRIP:
1706                 rc = -EPERM;
1707                 if (!capable(CAP_NET_ADMIN))
1708                         break;
1709                 rc = compat_x25_subscr_ioctl(cmd, argp);
1710                 break;
1711         case SIOCX25GFACILITIES:
1712         case SIOCX25SFACILITIES:
1713         case SIOCX25GDTEFACILITIES:
1714         case SIOCX25SDTEFACILITIES:
1715         case SIOCX25GCALLUSERDATA:
1716         case SIOCX25SCALLUSERDATA:
1717         case SIOCX25GCAUSEDIAG:
1718         case SIOCX25SCAUSEDIAG:
1719         case SIOCX25SCUDMATCHLEN:
1720         case SIOCX25CALLACCPTAPPRV:
1721         case SIOCX25SENDCALLACCPT:
1722                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1723                 break;
1724         default:
1725                 rc = -ENOIOCTLCMD;
1726                 break;
1727         }
1728         return rc;
1729 }
1730 #endif
1731
1732 static const struct proto_ops x25_proto_ops = {
1733         .family =       AF_X25,
1734         .owner =        THIS_MODULE,
1735         .release =      x25_release,
1736         .bind =         x25_bind,
1737         .connect =      x25_connect,
1738         .socketpair =   sock_no_socketpair,
1739         .accept =       x25_accept,
1740         .getname =      x25_getname,
1741         .poll =         datagram_poll,
1742         .ioctl =        x25_ioctl,
1743 #ifdef CONFIG_COMPAT
1744         .compat_ioctl = compat_x25_ioctl,
1745 #endif
1746         .gettstamp =    sock_gettstamp,
1747         .listen =       x25_listen,
1748         .shutdown =     sock_no_shutdown,
1749         .setsockopt =   x25_setsockopt,
1750         .getsockopt =   x25_getsockopt,
1751         .sendmsg =      x25_sendmsg,
1752         .recvmsg =      x25_recvmsg,
1753         .mmap =         sock_no_mmap,
1754         .sendpage =     sock_no_sendpage,
1755 };
1756
1757 static struct packet_type x25_packet_type __read_mostly = {
1758         .type = cpu_to_be16(ETH_P_X25),
1759         .func = x25_lapb_receive_frame,
1760 };
1761
1762 static struct notifier_block x25_dev_notifier = {
1763         .notifier_call = x25_device_event,
1764 };
1765
1766 void x25_kill_by_neigh(struct x25_neigh *nb)
1767 {
1768         struct sock *s;
1769
1770         write_lock_bh(&x25_list_lock);
1771
1772         sk_for_each(s, &x25_list) {
1773                 if (x25_sk(s)->neighbour == nb) {
1774                         write_unlock_bh(&x25_list_lock);
1775                         lock_sock(s);
1776                         x25_disconnect(s, ENETUNREACH, 0, 0);
1777                         release_sock(s);
1778                         write_lock_bh(&x25_list_lock);
1779                 }
1780         }
1781         write_unlock_bh(&x25_list_lock);
1782
1783         /* Remove any related forwards */
1784         x25_clear_forward_by_dev(nb->dev);
1785 }
1786
1787 static int __init x25_init(void)
1788 {
1789         int rc;
1790
1791         rc = proto_register(&x25_proto, 0);
1792         if (rc)
1793                 goto out;
1794
1795         rc = sock_register(&x25_family_ops);
1796         if (rc)
1797                 goto out_proto;
1798
1799         dev_add_pack(&x25_packet_type);
1800
1801         rc = register_netdevice_notifier(&x25_dev_notifier);
1802         if (rc)
1803                 goto out_sock;
1804
1805         rc = x25_register_sysctl();
1806         if (rc)
1807                 goto out_dev;
1808
1809         rc = x25_proc_init();
1810         if (rc)
1811                 goto out_sysctl;
1812
1813         pr_info("Linux Version 0.2\n");
1814
1815 out:
1816         return rc;
1817 out_sysctl:
1818         x25_unregister_sysctl();
1819 out_dev:
1820         unregister_netdevice_notifier(&x25_dev_notifier);
1821 out_sock:
1822         dev_remove_pack(&x25_packet_type);
1823         sock_unregister(AF_X25);
1824 out_proto:
1825         proto_unregister(&x25_proto);
1826         goto out;
1827 }
1828 module_init(x25_init);
1829
1830 static void __exit x25_exit(void)
1831 {
1832         x25_proc_exit();
1833         x25_link_free();
1834         x25_route_free();
1835
1836         x25_unregister_sysctl();
1837
1838         unregister_netdevice_notifier(&x25_dev_notifier);
1839
1840         dev_remove_pack(&x25_packet_type);
1841
1842         sock_unregister(AF_X25);
1843         proto_unregister(&x25_proto);
1844 }
1845 module_exit(x25_exit);
1846
1847 MODULE_AUTHOR("Jonathan Naylor <[email protected]>");
1848 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1849 MODULE_LICENSE("GPL");
1850 MODULE_ALIAS_NETPROTO(PF_X25);