linux/net/x25/af_x25.c
<<
>>
Prefs
   1/*
   2 *      X.25 Packet Layer release 002
   3 *
   4 *      This is ALPHA test software. This code may break your machine,
   5 *      randomly fail to work with new releases, misbehave and/or generally
   6 *      screw up. It might even work.
   7 *
   8 *      This code REQUIRES 2.1.15 or higher
   9 *
  10 *      This module:
  11 *              This module is free software; you can redistribute it and/or
  12 *              modify it under the terms of the GNU General Public License
  13 *              as published by the Free Software Foundation; either version
  14 *              2 of the License, or (at your option) any later version.
  15 *
  16 *      History
  17 *      X.25 001        Jonathan Naylor Started coding.
  18 *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19 *                                      New timer architecture.
  20 *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21 *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22 *                                        facilities negotiation and increased
  23 *                                        the throughput upper limit.
  24 *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25 *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26 *                                      Fixed x25_output() related skb leakage.
  27 *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28 *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29 *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30 *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31 *                                      x25_proc.c, using seq_file
  32 *      2005-04-02      Shaun Pereira   Selective sub address matching
  33 *                                      with call user data
  34 *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35 *                                      response
  36 */
  37
  38#include <linux/module.h>
  39#include <linux/capability.h>
  40#include <linux/errno.h>
  41#include <linux/kernel.h>
  42#include <linux/sched.h>
  43#include <linux/timer.h>
  44#include <linux/string.h>
  45#include <linux/net.h>
  46#include <linux/netdevice.h>
  47#include <linux/if_arp.h>
  48#include <linux/skbuff.h>
  49#include <linux/slab.h>
  50#include <net/sock.h>
  51#include <net/tcp_states.h>
  52#include <asm/uaccess.h>
  53#include <linux/fcntl.h>
  54#include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  55#include <linux/notifier.h>
  56#include <linux/init.h>
  57#include <linux/compat.h>
  58#include <linux/ctype.h>
  59
  60#include <net/x25.h>
  61#include <net/compat.h>
  62
  63int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  64int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  65int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  66int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  67int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  68int sysctl_x25_forward                 = 0;
  69
  70HLIST_HEAD(x25_list);
  71DEFINE_RWLOCK(x25_list_lock);
  72
  73static const struct proto_ops x25_proto_ops;
  74
  75static struct x25_address null_x25_address = {"               "};
  76
  77#ifdef CONFIG_COMPAT
  78struct compat_x25_subscrip_struct {
  79        char device[200-sizeof(compat_ulong_t)];
  80        compat_ulong_t global_facil_mask;
  81        compat_uint_t extended;
  82};
  83#endif
  84
  85
  86int x25_parse_address_block(struct sk_buff *skb,
  87                struct x25_address *called_addr,
  88                struct x25_address *calling_addr)
  89{
  90        unsigned char len;
  91        int needed;
  92        int rc;
  93
  94        if (!pskb_may_pull(skb, 1)) {
  95                /* packet has no address block */
  96                rc = 0;
  97                goto empty;
  98        }
  99
 100        len = *skb->data;
 101        needed = 1 + (len >> 4) + (len & 0x0f);
 102
 103        if (!pskb_may_pull(skb, needed)) {
 104                /* packet is too short to hold the addresses it claims
 105                   to hold */
 106                rc = -1;
 107                goto empty;
 108        }
 109
 110        return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 111
 112empty:
 113        *called_addr->x25_addr = 0;
 114        *calling_addr->x25_addr = 0;
 115
 116        return rc;
 117}
 118
 119
 120int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 121                  struct x25_address *calling_addr)
 122{
 123        unsigned int called_len, calling_len;
 124        char *called, *calling;
 125        unsigned int i;
 126
 127        called_len  = (*p >> 0) & 0x0F;
 128        calling_len = (*p >> 4) & 0x0F;
 129
 130        called  = called_addr->x25_addr;
 131        calling = calling_addr->x25_addr;
 132        p++;
 133
 134        for (i = 0; i < (called_len + calling_len); i++) {
 135                if (i < called_len) {
 136                        if (i % 2 != 0) {
 137                                *called++ = ((*p >> 0) & 0x0F) + '0';
 138                                p++;
 139                        } else {
 140                                *called++ = ((*p >> 4) & 0x0F) + '0';
 141                        }
 142                } else {
 143                        if (i % 2 != 0) {
 144                                *calling++ = ((*p >> 0) & 0x0F) + '0';
 145                                p++;
 146                        } else {
 147                                *calling++ = ((*p >> 4) & 0x0F) + '0';
 148                        }
 149                }
 150        }
 151
 152        *called = *calling = '\0';
 153
 154        return 1 + (called_len + calling_len + 1) / 2;
 155}
 156
 157int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 158                  struct x25_address *calling_addr)
 159{
 160        unsigned int called_len, calling_len;
 161        char *called, *calling;
 162        int i;
 163
 164        called  = called_addr->x25_addr;
 165        calling = calling_addr->x25_addr;
 166
 167        called_len  = strlen(called);
 168        calling_len = strlen(calling);
 169
 170        *p++ = (calling_len << 4) | (called_len << 0);
 171
 172        for (i = 0; i < (called_len + calling_len); i++) {
 173                if (i < called_len) {
 174                        if (i % 2 != 0) {
 175                                *p |= (*called++ - '0') << 0;
 176                                p++;
 177                        } else {
 178                                *p = 0x00;
 179                                *p |= (*called++ - '0') << 4;
 180                        }
 181                } else {
 182                        if (i % 2 != 0) {
 183                                *p |= (*calling++ - '0') << 0;
 184                                p++;
 185                        } else {
 186                                *p = 0x00;
 187                                *p |= (*calling++ - '0') << 4;
 188                        }
 189                }
 190        }
 191
 192        return 1 + (called_len + calling_len + 1) / 2;
 193}
 194
 195/*
 196 *      Socket removal during an interrupt is now safe.
 197 */
 198static void x25_remove_socket(struct sock *sk)
 199{
 200        write_lock_bh(&x25_list_lock);
 201        sk_del_node_init(sk);
 202        write_unlock_bh(&x25_list_lock);
 203}
 204
 205/*
 206 *      Kill all bound sockets on a dropped device.
 207 */
 208static void x25_kill_by_device(struct net_device *dev)
 209{
 210        struct sock *s;
 211        struct hlist_node *node;
 212
 213        write_lock_bh(&x25_list_lock);
 214
 215        sk_for_each(s, node, &x25_list)
 216                if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 217                        x25_disconnect(s, ENETUNREACH, 0, 0);
 218
 219        write_unlock_bh(&x25_list_lock);
 220}
 221
 222/*
 223 *      Handle device status changes.
 224 */
 225static int x25_device_event(struct notifier_block *this, unsigned long event,
 226                            void *ptr)
 227{
 228        struct net_device *dev = ptr;
 229        struct x25_neigh *nb;
 230
 231        if (!net_eq(dev_net(dev), &init_net))
 232                return NOTIFY_DONE;
 233
 234        if (dev->type == ARPHRD_X25
 235#if IS_ENABLED(CONFIG_LLC)
 236         || dev->type == ARPHRD_ETHER
 237#endif
 238         ) {
 239                switch (event) {
 240                case NETDEV_UP:
 241                        x25_link_device_up(dev);
 242                        break;
 243                case NETDEV_GOING_DOWN:
 244                        nb = x25_get_neigh(dev);
 245                        if (nb) {
 246                                x25_terminate_link(nb);
 247                                x25_neigh_put(nb);
 248                        }
 249                        break;
 250                case NETDEV_DOWN:
 251                        x25_kill_by_device(dev);
 252                        x25_route_device_down(dev);
 253                        x25_link_device_down(dev);
 254                        break;
 255                }
 256        }
 257
 258        return NOTIFY_DONE;
 259}
 260
 261/*
 262 *      Add a socket to the bound sockets list.
 263 */
 264static void x25_insert_socket(struct sock *sk)
 265{
 266        write_lock_bh(&x25_list_lock);
 267        sk_add_node(sk, &x25_list);
 268        write_unlock_bh(&x25_list_lock);
 269}
 270
 271/*
 272 *      Find a socket that wants to accept the Call Request we just
 273 *      received. Check the full list for an address/cud match.
 274 *      If no cuds match return the next_best thing, an address match.
 275 *      Note: if a listening socket has cud set it must only get calls
 276 *      with matching cud.
 277 */
 278static struct sock *x25_find_listener(struct x25_address *addr,
 279                                        struct sk_buff *skb)
 280{
 281        struct sock *s;
 282        struct sock *next_best;
 283        struct hlist_node *node;
 284
 285        read_lock_bh(&x25_list_lock);
 286        next_best = NULL;
 287
 288        sk_for_each(s, node, &x25_list)
 289                if ((!strcmp(addr->x25_addr,
 290                        x25_sk(s)->source_addr.x25_addr) ||
 291                                !strcmp(addr->x25_addr,
 292                                        null_x25_address.x25_addr)) &&
 293                                        s->sk_state == TCP_LISTEN) {
 294                        /*
 295                         * Found a listening socket, now check the incoming
 296                         * call user data vs this sockets call user data
 297                         */
 298                        if (x25_sk(s)->cudmatchlength > 0 &&
 299                                skb->len >= x25_sk(s)->cudmatchlength) {
 300                                if((memcmp(x25_sk(s)->calluserdata.cuddata,
 301                                        skb->data,
 302                                        x25_sk(s)->cudmatchlength)) == 0) {
 303                                        sock_hold(s);
 304                                        goto found;
 305                                 }
 306                        } else
 307                                next_best = s;
 308                }
 309        if (next_best) {
 310                s = next_best;
 311                sock_hold(s);
 312                goto found;
 313        }
 314        s = NULL;
 315found:
 316        read_unlock_bh(&x25_list_lock);
 317        return s;
 318}
 319
 320/*
 321 *      Find a connected X.25 socket given my LCI and neighbour.
 322 */
 323static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 324{
 325        struct sock *s;
 326        struct hlist_node *node;
 327
 328        sk_for_each(s, node, &x25_list)
 329                if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 330                        sock_hold(s);
 331                        goto found;
 332                }
 333        s = NULL;
 334found:
 335        return s;
 336}
 337
 338struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 339{
 340        struct sock *s;
 341
 342        read_lock_bh(&x25_list_lock);
 343        s = __x25_find_socket(lci, nb);
 344        read_unlock_bh(&x25_list_lock);
 345        return s;
 346}
 347
 348/*
 349 *      Find a unique LCI for a given device.
 350 */
 351static unsigned int x25_new_lci(struct x25_neigh *nb)
 352{
 353        unsigned int lci = 1;
 354        struct sock *sk;
 355
 356        read_lock_bh(&x25_list_lock);
 357
 358        while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 359                sock_put(sk);
 360                if (++lci == 4096) {
 361                        lci = 0;
 362                        break;
 363                }
 364        }
 365
 366        read_unlock_bh(&x25_list_lock);
 367        return lci;
 368}
 369
 370/*
 371 *      Deferred destroy.
 372 */
 373static void __x25_destroy_socket(struct sock *);
 374
 375/*
 376 *      handler for deferred kills.
 377 */
 378static void x25_destroy_timer(unsigned long data)
 379{
 380        x25_destroy_socket_from_timer((struct sock *)data);
 381}
 382
 383/*
 384 *      This is called from user mode and the timers. Thus it protects itself
 385 *      against interrupt users but doesn't worry about being called during
 386 *      work. Once it is removed from the queue no interrupt or bottom half
 387 *      will touch it and we are (fairly 8-) ) safe.
 388 *      Not static as it's used by the timer
 389 */
 390static void __x25_destroy_socket(struct sock *sk)
 391{
 392        struct sk_buff *skb;
 393
 394        x25_stop_heartbeat(sk);
 395        x25_stop_timer(sk);
 396
 397        x25_remove_socket(sk);
 398        x25_clear_queues(sk);           /* Flush the queues */
 399
 400        while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 401                if (skb->sk != sk) {            /* A pending connection */
 402                        /*
 403                         * Queue the unaccepted socket for death
 404                         */
 405                        skb->sk->sk_state = TCP_LISTEN;
 406                        sock_set_flag(skb->sk, SOCK_DEAD);
 407                        x25_start_heartbeat(skb->sk);
 408                        x25_sk(skb->sk)->state = X25_STATE_0;
 409                }
 410
 411                kfree_skb(skb);
 412        }
 413
 414        if (sk_has_allocations(sk)) {
 415                /* Defer: outstanding buffers */
 416                sk->sk_timer.expires  = jiffies + 10 * HZ;
 417                sk->sk_timer.function = x25_destroy_timer;
 418                sk->sk_timer.data = (unsigned long)sk;
 419                add_timer(&sk->sk_timer);
 420        } else {
 421                /* drop last reference so sock_put will free */
 422                __sock_put(sk);
 423        }
 424}
 425
 426void x25_destroy_socket_from_timer(struct sock *sk)
 427{
 428        sock_hold(sk);
 429        bh_lock_sock(sk);
 430        __x25_destroy_socket(sk);
 431        bh_unlock_sock(sk);
 432        sock_put(sk);
 433}
 434
 435/*
 436 *      Handling for system calls applied via the various interfaces to a
 437 *      X.25 socket object.
 438 */
 439
 440static int x25_setsockopt(struct socket *sock, int level, int optname,
 441                          char __user *optval, unsigned int optlen)
 442{
 443        int opt;
 444        struct sock *sk = sock->sk;
 445        int rc = -ENOPROTOOPT;
 446
 447        if (level != SOL_X25 || optname != X25_QBITINCL)
 448                goto out;
 449
 450        rc = -EINVAL;
 451        if (optlen < sizeof(int))
 452                goto out;
 453
 454        rc = -EFAULT;
 455        if (get_user(opt, (int __user *)optval))
 456                goto out;
 457
 458        if (opt)
 459                set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 460        else
 461                clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 462        rc = 0;
 463out:
 464        return rc;
 465}
 466
 467static int x25_getsockopt(struct socket *sock, int level, int optname,
 468                          char __user *optval, int __user *optlen)
 469{
 470        struct sock *sk = sock->sk;
 471        int val, len, rc = -ENOPROTOOPT;
 472
 473        if (level != SOL_X25 || optname != X25_QBITINCL)
 474                goto out;
 475
 476        rc = -EFAULT;
 477        if (get_user(len, optlen))
 478                goto out;
 479
 480        len = min_t(unsigned int, len, sizeof(int));
 481
 482        rc = -EINVAL;
 483        if (len < 0)
 484                goto out;
 485
 486        rc = -EFAULT;
 487        if (put_user(len, optlen))
 488                goto out;
 489
 490        val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 491        rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 492out:
 493        return rc;
 494}
 495
 496static int x25_listen(struct socket *sock, int backlog)
 497{
 498        struct sock *sk = sock->sk;
 499        int rc = -EOPNOTSUPP;
 500
 501        lock_sock(sk);
 502        if (sk->sk_state != TCP_LISTEN) {
 503                memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 504                sk->sk_max_ack_backlog = backlog;
 505                sk->sk_state           = TCP_LISTEN;
 506                rc = 0;
 507        }
 508        release_sock(sk);
 509
 510        return rc;
 511}
 512
 513static struct proto x25_proto = {
 514        .name     = "X25",
 515        .owner    = THIS_MODULE,
 516        .obj_size = sizeof(struct x25_sock),
 517};
 518
 519static struct sock *x25_alloc_socket(struct net *net)
 520{
 521        struct x25_sock *x25;
 522        struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 523
 524        if (!sk)
 525                goto out;
 526
 527        sock_init_data(NULL, sk);
 528
 529        x25 = x25_sk(sk);
 530        skb_queue_head_init(&x25->ack_queue);
 531        skb_queue_head_init(&x25->fragment_queue);
 532        skb_queue_head_init(&x25->interrupt_in_queue);
 533        skb_queue_head_init(&x25->interrupt_out_queue);
 534out:
 535        return sk;
 536}
 537
 538static int x25_create(struct net *net, struct socket *sock, int protocol,
 539                      int kern)
 540{
 541        struct sock *sk;
 542        struct x25_sock *x25;
 543        int rc = -EAFNOSUPPORT;
 544
 545        if (!net_eq(net, &init_net))
 546                goto out;
 547
 548        rc = -ESOCKTNOSUPPORT;
 549        if (sock->type != SOCK_SEQPACKET)
 550                goto out;
 551
 552        rc = -EINVAL;
 553        if (protocol)
 554                goto out;
 555
 556        rc = -ENOBUFS;
 557        if ((sk = x25_alloc_socket(net)) == NULL)
 558                goto out;
 559
 560        x25 = x25_sk(sk);
 561
 562        sock_init_data(sock, sk);
 563
 564        x25_init_timers(sk);
 565
 566        sock->ops    = &x25_proto_ops;
 567        sk->sk_protocol = protocol;
 568        sk->sk_backlog_rcv = x25_backlog_rcv;
 569
 570        x25->t21   = sysctl_x25_call_request_timeout;
 571        x25->t22   = sysctl_x25_reset_request_timeout;
 572        x25->t23   = sysctl_x25_clear_request_timeout;
 573        x25->t2    = sysctl_x25_ack_holdback_timeout;
 574        x25->state = X25_STATE_0;
 575        x25->cudmatchlength = 0;
 576        set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 577                                                        /* on call accept   */
 578
 579        x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 580        x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 581        x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 582        x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 583        x25->facilities.throughput  = 0;        /* by default don't negotiate
 584                                                   throughput */
 585        x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 586        x25->dte_facilities.calling_len = 0;
 587        x25->dte_facilities.called_len = 0;
 588        memset(x25->dte_facilities.called_ae, '\0',
 589                        sizeof(x25->dte_facilities.called_ae));
 590        memset(x25->dte_facilities.calling_ae, '\0',
 591                        sizeof(x25->dte_facilities.calling_ae));
 592
 593        rc = 0;
 594out:
 595        return rc;
 596}
 597
 598static struct sock *x25_make_new(struct sock *osk)
 599{
 600        struct sock *sk = NULL;
 601        struct x25_sock *x25, *ox25;
 602
 603        if (osk->sk_type != SOCK_SEQPACKET)
 604                goto out;
 605
 606        if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 607                goto out;
 608
 609        x25 = x25_sk(sk);
 610
 611        sk->sk_type        = osk->sk_type;
 612        sk->sk_priority    = osk->sk_priority;
 613        sk->sk_protocol    = osk->sk_protocol;
 614        sk->sk_rcvbuf      = osk->sk_rcvbuf;
 615        sk->sk_sndbuf      = osk->sk_sndbuf;
 616        sk->sk_state       = TCP_ESTABLISHED;
 617        sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 618        sock_copy_flags(sk, osk);
 619
 620        ox25 = x25_sk(osk);
 621        x25->t21        = ox25->t21;
 622        x25->t22        = ox25->t22;
 623        x25->t23        = ox25->t23;
 624        x25->t2         = ox25->t2;
 625        x25->flags      = ox25->flags;
 626        x25->facilities = ox25->facilities;
 627        x25->dte_facilities = ox25->dte_facilities;
 628        x25->cudmatchlength = ox25->cudmatchlength;
 629
 630        clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 631        x25_init_timers(sk);
 632out:
 633        return sk;
 634}
 635
 636static int x25_release(struct socket *sock)
 637{
 638        struct sock *sk = sock->sk;
 639        struct x25_sock *x25;
 640
 641        if (!sk)
 642                return 0;
 643
 644        x25 = x25_sk(sk);
 645
 646        sock_hold(sk);
 647        lock_sock(sk);
 648        switch (x25->state) {
 649
 650                case X25_STATE_0:
 651                case X25_STATE_2:
 652                        x25_disconnect(sk, 0, 0, 0);
 653                        __x25_destroy_socket(sk);
 654                        goto out;
 655
 656                case X25_STATE_1:
 657                case X25_STATE_3:
 658                case X25_STATE_4:
 659                        x25_clear_queues(sk);
 660                        x25_write_internal(sk, X25_CLEAR_REQUEST);
 661                        x25_start_t23timer(sk);
 662                        x25->state = X25_STATE_2;
 663                        sk->sk_state    = TCP_CLOSE;
 664                        sk->sk_shutdown |= SEND_SHUTDOWN;
 665                        sk->sk_state_change(sk);
 666                        sock_set_flag(sk, SOCK_DEAD);
 667                        sock_set_flag(sk, SOCK_DESTROY);
 668                        break;
 669        }
 670
 671        sock_orphan(sk);
 672out:
 673        release_sock(sk);
 674        sock_put(sk);
 675        return 0;
 676}
 677
 678static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 679{
 680        struct sock *sk = sock->sk;
 681        struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 682        int len, i, rc = 0;
 683
 684        if (!sock_flag(sk, SOCK_ZAPPED) ||
 685            addr_len != sizeof(struct sockaddr_x25) ||
 686            addr->sx25_family != AF_X25) {
 687                rc = -EINVAL;
 688                goto out;
 689        }
 690
 691        len = strlen(addr->sx25_addr.x25_addr);
 692        for (i = 0; i < len; i++) {
 693                if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 694                        rc = -EINVAL;
 695                        goto out;
 696                }
 697        }
 698
 699        lock_sock(sk);
 700        x25_sk(sk)->source_addr = addr->sx25_addr;
 701        x25_insert_socket(sk);
 702        sock_reset_flag(sk, SOCK_ZAPPED);
 703        release_sock(sk);
 704        SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 705out:
 706        return rc;
 707}
 708
 709static int x25_wait_for_connection_establishment(struct sock *sk)
 710{
 711        DECLARE_WAITQUEUE(wait, current);
 712        int rc;
 713
 714        add_wait_queue_exclusive(sk_sleep(sk), &wait);
 715        for (;;) {
 716                __set_current_state(TASK_INTERRUPTIBLE);
 717                rc = -ERESTARTSYS;
 718                if (signal_pending(current))
 719                        break;
 720                rc = sock_error(sk);
 721                if (rc) {
 722                        sk->sk_socket->state = SS_UNCONNECTED;
 723                        break;
 724                }
 725                rc = 0;
 726                if (sk->sk_state != TCP_ESTABLISHED) {
 727                        release_sock(sk);
 728                        schedule();
 729                        lock_sock(sk);
 730                } else
 731                        break;
 732        }
 733        __set_current_state(TASK_RUNNING);
 734        remove_wait_queue(sk_sleep(sk), &wait);
 735        return rc;
 736}
 737
 738static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 739                       int addr_len, int flags)
 740{
 741        struct sock *sk = sock->sk;
 742        struct x25_sock *x25 = x25_sk(sk);
 743        struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 744        struct x25_route *rt;
 745        int rc = 0;
 746
 747        lock_sock(sk);
 748        if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 749                sock->state = SS_CONNECTED;
 750                goto out; /* Connect completed during a ERESTARTSYS event */
 751        }
 752
 753        rc = -ECONNREFUSED;
 754        if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 755                sock->state = SS_UNCONNECTED;
 756                goto out;
 757        }
 758
 759        rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 760        if (sk->sk_state == TCP_ESTABLISHED)
 761                goto out;
 762
 763        sk->sk_state   = TCP_CLOSE;
 764        sock->state = SS_UNCONNECTED;
 765
 766        rc = -EINVAL;
 767        if (addr_len != sizeof(struct sockaddr_x25) ||
 768            addr->sx25_family != AF_X25)
 769                goto out;
 770
 771        rc = -ENETUNREACH;
 772        rt = x25_get_route(&addr->sx25_addr);
 773        if (!rt)
 774                goto out;
 775
 776        x25->neighbour = x25_get_neigh(rt->dev);
 777        if (!x25->neighbour)
 778                goto out_put_route;
 779
 780        x25_limit_facilities(&x25->facilities, x25->neighbour);
 781
 782        x25->lci = x25_new_lci(x25->neighbour);
 783        if (!x25->lci)
 784                goto out_put_neigh;
 785
 786        rc = -EINVAL;
 787        if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 788                goto out_put_neigh;
 789
 790        if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 791                memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 792
 793        x25->dest_addr = addr->sx25_addr;
 794
 795        /* Move to connecting socket, start sending Connect Requests */
 796        sock->state   = SS_CONNECTING;
 797        sk->sk_state  = TCP_SYN_SENT;
 798
 799        x25->state = X25_STATE_1;
 800
 801        x25_write_internal(sk, X25_CALL_REQUEST);
 802
 803        x25_start_heartbeat(sk);
 804        x25_start_t21timer(sk);
 805
 806        /* Now the loop */
 807        rc = -EINPROGRESS;
 808        if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 809                goto out_put_neigh;
 810
 811        rc = x25_wait_for_connection_establishment(sk);
 812        if (rc)
 813                goto out_put_neigh;
 814
 815        sock->state = SS_CONNECTED;
 816        rc = 0;
 817out_put_neigh:
 818        if (rc)
 819                x25_neigh_put(x25->neighbour);
 820out_put_route:
 821        x25_route_put(rt);
 822out:
 823        release_sock(sk);
 824        return rc;
 825}
 826
 827static int x25_wait_for_data(struct sock *sk, long timeout)
 828{
 829        DECLARE_WAITQUEUE(wait, current);
 830        int rc = 0;
 831
 832        add_wait_queue_exclusive(sk_sleep(sk), &wait);
 833        for (;;) {
 834                __set_current_state(TASK_INTERRUPTIBLE);
 835                if (sk->sk_shutdown & RCV_SHUTDOWN)
 836                        break;
 837                rc = -ERESTARTSYS;
 838                if (signal_pending(current))
 839                        break;
 840                rc = -EAGAIN;
 841                if (!timeout)
 842                        break;
 843                rc = 0;
 844                if (skb_queue_empty(&sk->sk_receive_queue)) {
 845                        release_sock(sk);
 846                        timeout = schedule_timeout(timeout);
 847                        lock_sock(sk);
 848                } else
 849                        break;
 850        }
 851        __set_current_state(TASK_RUNNING);
 852        remove_wait_queue(sk_sleep(sk), &wait);
 853        return rc;
 854}
 855
 856static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 857{
 858        struct sock *sk = sock->sk;
 859        struct sock *newsk;
 860        struct sk_buff *skb;
 861        int rc = -EINVAL;
 862
 863        if (!sk)
 864                goto out;
 865
 866        rc = -EOPNOTSUPP;
 867        if (sk->sk_type != SOCK_SEQPACKET)
 868                goto out;
 869
 870        lock_sock(sk);
 871        rc = -EINVAL;
 872        if (sk->sk_state != TCP_LISTEN)
 873                goto out2;
 874
 875        rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 876        if (rc)
 877                goto out2;
 878        skb = skb_dequeue(&sk->sk_receive_queue);
 879        rc = -EINVAL;
 880        if (!skb->sk)
 881                goto out2;
 882        newsk            = skb->sk;
 883        sock_graft(newsk, newsock);
 884
 885        /* Now attach up the new socket */
 886        skb->sk = NULL;
 887        kfree_skb(skb);
 888        sk->sk_ack_backlog--;
 889        newsock->state = SS_CONNECTED;
 890        rc = 0;
 891out2:
 892        release_sock(sk);
 893out:
 894        return rc;
 895}
 896
 897static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 898                       int *uaddr_len, int peer)
 899{
 900        struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 901        struct sock *sk = sock->sk;
 902        struct x25_sock *x25 = x25_sk(sk);
 903        int rc = 0;
 904
 905        if (peer) {
 906                if (sk->sk_state != TCP_ESTABLISHED) {
 907                        rc = -ENOTCONN;
 908                        goto out;
 909                }
 910                sx25->sx25_addr = x25->dest_addr;
 911        } else
 912                sx25->sx25_addr = x25->source_addr;
 913
 914        sx25->sx25_family = AF_X25;
 915        *uaddr_len = sizeof(*sx25);
 916
 917out:
 918        return rc;
 919}
 920
 921int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 922                        unsigned int lci)
 923{
 924        struct sock *sk;
 925        struct sock *make;
 926        struct x25_sock *makex25;
 927        struct x25_address source_addr, dest_addr;
 928        struct x25_facilities facilities;
 929        struct x25_dte_facilities dte_facilities;
 930        int len, addr_len, rc;
 931
 932        /*
 933         *      Remove the LCI and frame type.
 934         */
 935        skb_pull(skb, X25_STD_MIN_LEN);
 936
 937        /*
 938         *      Extract the X.25 addresses and convert them to ASCII strings,
 939         *      and remove them.
 940         *
 941         *      Address block is mandatory in call request packets
 942         */
 943        addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 944        if (addr_len <= 0)
 945                goto out_clear_request;
 946        skb_pull(skb, addr_len);
 947
 948        /*
 949         *      Get the length of the facilities, skip past them for the moment
 950         *      get the call user data because this is needed to determine
 951         *      the correct listener
 952         *
 953         *      Facilities length is mandatory in call request packets
 954         */
 955        if (!pskb_may_pull(skb, 1))
 956                goto out_clear_request;
 957        len = skb->data[0] + 1;
 958        if (!pskb_may_pull(skb, len))
 959                goto out_clear_request;
 960        skb_pull(skb,len);
 961
 962        /*
 963         *      Ensure that the amount of call user data is valid.
 964         */
 965        if (skb->len > X25_MAX_CUD_LEN)
 966                goto out_clear_request;
 967
 968        /*
 969         *      Get all the call user data so it can be used in
 970         *      x25_find_listener and skb_copy_from_linear_data up ahead.
 971         */
 972        if (!pskb_may_pull(skb, skb->len))
 973                goto out_clear_request;
 974
 975        /*
 976         *      Find a listener for the particular address/cud pair.
 977         */
 978        sk = x25_find_listener(&source_addr,skb);
 979        skb_push(skb,len);
 980
 981        if (sk != NULL && sk_acceptq_is_full(sk)) {
 982                goto out_sock_put;
 983        }
 984
 985        /*
 986         *      We dont have any listeners for this incoming call.
 987         *      Try forwarding it.
 988         */
 989        if (sk == NULL) {
 990                skb_push(skb, addr_len + X25_STD_MIN_LEN);
 991                if (sysctl_x25_forward &&
 992                                x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 993                {
 994                        /* Call was forwarded, dont process it any more */
 995                        kfree_skb(skb);
 996                        rc = 1;
 997                        goto out;
 998                } else {
 999                        /* No listeners, can't forward, clear the call */
1000                        goto out_clear_request;
1001                }
1002        }
1003
1004        /*
1005         *      Try to reach a compromise on the requested facilities.
1006         */
1007        len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1008        if (len == -1)
1009                goto out_sock_put;
1010
1011        /*
1012         * current neighbour/link might impose additional limits
1013         * on certain facilties
1014         */
1015
1016        x25_limit_facilities(&facilities, nb);
1017
1018        /*
1019         *      Try to create a new socket.
1020         */
1021        make = x25_make_new(sk);
1022        if (!make)
1023                goto out_sock_put;
1024
1025        /*
1026         *      Remove the facilities
1027         */
1028        skb_pull(skb, len);
1029
1030        skb->sk     = make;
1031        make->sk_state = TCP_ESTABLISHED;
1032
1033        makex25 = x25_sk(make);
1034        makex25->lci           = lci;
1035        makex25->dest_addr     = dest_addr;
1036        makex25->source_addr   = source_addr;
1037        makex25->neighbour     = nb;
1038        makex25->facilities    = facilities;
1039        makex25->dte_facilities= dte_facilities;
1040        makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1041        /* ensure no reverse facil on accept */
1042        makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1043        /* ensure no calling address extension on accept */
1044        makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1045        makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1046
1047        /* Normally all calls are accepted immediately */
1048        if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1049                x25_write_internal(make, X25_CALL_ACCEPTED);
1050                makex25->state = X25_STATE_3;
1051        }
1052
1053        /*
1054         *      Incoming Call User Data.
1055         */
1056        skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1057        makex25->calluserdata.cudlength = skb->len;
1058
1059        sk->sk_ack_backlog++;
1060
1061        x25_insert_socket(make);
1062
1063        skb_queue_head(&sk->sk_receive_queue, skb);
1064
1065        x25_start_heartbeat(make);
1066
1067        if (!sock_flag(sk, SOCK_DEAD))
1068                sk->sk_data_ready(sk, skb->len);
1069        rc = 1;
1070        sock_put(sk);
1071out:
1072        return rc;
1073out_sock_put:
1074        sock_put(sk);
1075out_clear_request:
1076        rc = 0;
1077        x25_transmit_clear_request(nb, lci, 0x01);
1078        goto out;
1079}
1080
1081static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1082                       struct msghdr *msg, size_t len)
1083{
1084        struct sock *sk = sock->sk;
1085        struct x25_sock *x25 = x25_sk(sk);
1086        struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1087        struct sockaddr_x25 sx25;
1088        struct sk_buff *skb;
1089        unsigned char *asmptr;
1090        int noblock = msg->msg_flags & MSG_DONTWAIT;
1091        size_t size;
1092        int qbit = 0, rc = -EINVAL;
1093
1094        lock_sock(sk);
1095        if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1096                goto out;
1097
1098        /* we currently don't support segmented records at the user interface */
1099        if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1100                goto out;
1101
1102        rc = -EADDRNOTAVAIL;
1103        if (sock_flag(sk, SOCK_ZAPPED))
1104                goto out;
1105
1106        rc = -EPIPE;
1107        if (sk->sk_shutdown & SEND_SHUTDOWN) {
1108                send_sig(SIGPIPE, current, 0);
1109                goto out;
1110        }
1111
1112        rc = -ENETUNREACH;
1113        if (!x25->neighbour)
1114                goto out;
1115
1116        if (usx25) {
1117                rc = -EINVAL;
1118                if (msg->msg_namelen < sizeof(sx25))
1119                        goto out;
1120                memcpy(&sx25, usx25, sizeof(sx25));
1121                rc = -EISCONN;
1122                if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1123                        goto out;
1124                rc = -EINVAL;
1125                if (sx25.sx25_family != AF_X25)
1126                        goto out;
1127        } else {
1128                /*
1129                 *      FIXME 1003.1g - if the socket is like this because
1130                 *      it has become closed (not started closed) we ought
1131                 *      to SIGPIPE, EPIPE;
1132                 */
1133                rc = -ENOTCONN;
1134                if (sk->sk_state != TCP_ESTABLISHED)
1135                        goto out;
1136
1137                sx25.sx25_family = AF_X25;
1138                sx25.sx25_addr   = x25->dest_addr;
1139        }
1140
1141        /* Sanity check the packet size */
1142        if (len > 65535) {
1143                rc = -EMSGSIZE;
1144                goto out;
1145        }
1146
1147        SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1148
1149        /* Build a packet */
1150        SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1151
1152        if ((msg->msg_flags & MSG_OOB) && len > 32)
1153                len = 32;
1154
1155        size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1156
1157        release_sock(sk);
1158        skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1159        lock_sock(sk);
1160        if (!skb)
1161                goto out;
1162        X25_SKB_CB(skb)->flags = msg->msg_flags;
1163
1164        skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1165
1166        /*
1167         *      Put the data on the end
1168         */
1169        SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1170
1171        skb_reset_transport_header(skb);
1172        skb_put(skb, len);
1173
1174        rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1175        if (rc)
1176                goto out_kfree_skb;
1177
1178        /*
1179         *      If the Q BIT Include socket option is in force, the first
1180         *      byte of the user data is the logical value of the Q Bit.
1181         */
1182        if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1183                if (!pskb_may_pull(skb, 1))
1184                        goto out_kfree_skb;
1185
1186                qbit = skb->data[0];
1187                skb_pull(skb, 1);
1188        }
1189
1190        /*
1191         *      Push down the X.25 header
1192         */
1193        SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1194
1195        if (msg->msg_flags & MSG_OOB) {
1196                if (x25->neighbour->extended) {
1197                        asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1198                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1199                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1200                        *asmptr++ = X25_INTERRUPT;
1201                } else {
1202                        asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1203                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1204                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1205                        *asmptr++ = X25_INTERRUPT;
1206                }
1207        } else {
1208                if (x25->neighbour->extended) {
1209                        /* Build an Extended X.25 header */
1210                        asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1211                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1212                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1213                        *asmptr++ = X25_DATA;
1214                        *asmptr++ = X25_DATA;
1215                } else {
1216                        /* Build an Standard X.25 header */
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_DATA;
1221                }
1222
1223                if (qbit)
1224                        skb->data[0] |= X25_Q_BIT;
1225        }
1226
1227        SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1228        SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1229
1230        rc = -ENOTCONN;
1231        if (sk->sk_state != TCP_ESTABLISHED)
1232                goto out_kfree_skb;
1233
1234        if (msg->msg_flags & MSG_OOB)
1235                skb_queue_tail(&x25->interrupt_out_queue, skb);
1236        else {
1237                rc = x25_output(sk, skb);
1238                len = rc;
1239                if (rc < 0)
1240                        kfree_skb(skb);
1241                else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1242                        len++;
1243        }
1244
1245        x25_kick(sk);
1246        rc = len;
1247out:
1248        release_sock(sk);
1249        return rc;
1250out_kfree_skb:
1251        kfree_skb(skb);
1252        goto out;
1253}
1254
1255
1256static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1257                       struct msghdr *msg, size_t size,
1258                       int flags)
1259{
1260        struct sock *sk = sock->sk;
1261        struct x25_sock *x25 = x25_sk(sk);
1262        struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1263        size_t copied;
1264        int qbit, header_len;
1265        struct sk_buff *skb;
1266        unsigned char *asmptr;
1267        int rc = -ENOTCONN;
1268
1269        lock_sock(sk);
1270
1271        if (x25->neighbour == NULL)
1272                goto out;
1273
1274        header_len = x25->neighbour->extended ?
1275                X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1276
1277        /*
1278         * This works for seqpacket too. The receiver has ordered the queue for
1279         * us! We do one quick check first though
1280         */
1281        if (sk->sk_state != TCP_ESTABLISHED)
1282                goto out;
1283
1284        if (flags & MSG_OOB) {
1285                rc = -EINVAL;
1286                if (sock_flag(sk, SOCK_URGINLINE) ||
1287                    !skb_peek(&x25->interrupt_in_queue))
1288                        goto out;
1289
1290                skb = skb_dequeue(&x25->interrupt_in_queue);
1291
1292                if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1293                        goto out_free_dgram;
1294
1295                skb_pull(skb, X25_STD_MIN_LEN);
1296
1297                /*
1298                 *      No Q bit information on Interrupt data.
1299                 */
1300                if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1301                        asmptr  = skb_push(skb, 1);
1302                        *asmptr = 0x00;
1303                }
1304
1305                msg->msg_flags |= MSG_OOB;
1306        } else {
1307                /* Now we can treat all alike */
1308                release_sock(sk);
1309                skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1310                                        flags & MSG_DONTWAIT, &rc);
1311                lock_sock(sk);
1312                if (!skb)
1313                        goto out;
1314
1315                if (!pskb_may_pull(skb, header_len))
1316                        goto out_free_dgram;
1317
1318                qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1319
1320                skb_pull(skb, header_len);
1321
1322                if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1323                        asmptr  = skb_push(skb, 1);
1324                        *asmptr = qbit;
1325                }
1326        }
1327
1328        skb_reset_transport_header(skb);
1329        copied = skb->len;
1330
1331        if (copied > size) {
1332                copied = size;
1333                msg->msg_flags |= MSG_TRUNC;
1334        }
1335
1336        /* Currently, each datagram always contains a complete record */
1337        msg->msg_flags |= MSG_EOR;
1338
1339        rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1340        if (rc)
1341                goto out_free_dgram;
1342
1343        if (sx25) {
1344                sx25->sx25_family = AF_X25;
1345                sx25->sx25_addr   = x25->dest_addr;
1346        }
1347
1348        msg->msg_namelen = sizeof(struct sockaddr_x25);
1349
1350        x25_check_rbuf(sk);
1351        rc = copied;
1352out_free_dgram:
1353        skb_free_datagram(sk, skb);
1354out:
1355        release_sock(sk);
1356        return rc;
1357}
1358
1359
1360static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1361{
1362        struct sock *sk = sock->sk;
1363        struct x25_sock *x25 = x25_sk(sk);
1364        void __user *argp = (void __user *)arg;
1365        int rc;
1366
1367        switch (cmd) {
1368        case TIOCOUTQ: {
1369                int amount;
1370
1371                amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1372                if (amount < 0)
1373                        amount = 0;
1374                rc = put_user(amount, (unsigned int __user *)argp);
1375                break;
1376        }
1377
1378        case TIOCINQ: {
1379                struct sk_buff *skb;
1380                int amount = 0;
1381                /*
1382                 * These two are safe on a single CPU system as
1383                 * only user tasks fiddle here
1384                 */
1385                lock_sock(sk);
1386                if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1387                        amount = skb->len;
1388                release_sock(sk);
1389                rc = put_user(amount, (unsigned int __user *)argp);
1390                break;
1391        }
1392
1393        case SIOCGSTAMP:
1394                rc = -EINVAL;
1395                if (sk)
1396                        rc = sock_get_timestamp(sk,
1397                                                (struct timeval __user *)argp);
1398                break;
1399        case SIOCGSTAMPNS:
1400                rc = -EINVAL;
1401                if (sk)
1402                        rc = sock_get_timestampns(sk,
1403                                        (struct timespec __user *)argp);
1404                break;
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;
1480out_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.calling_ae == NULL)
1508                        goto out_dtefac_release;
1509                if (dtefacs.called_len > X25_MAX_AE_LEN)
1510                        goto out_dtefac_release;
1511                if (dtefacs.called_ae == NULL)
1512                        goto out_dtefac_release;
1513                x25->dte_facilities = dtefacs;
1514                rc = 0;
1515out_dtefac_release:
1516                release_sock(sk);
1517                break;
1518        }
1519
1520        case SIOCX25GCALLUSERDATA: {
1521                lock_sock(sk);
1522                rc = copy_to_user(argp, &x25->calluserdata,
1523                                  sizeof(x25->calluserdata))
1524                        ? -EFAULT : 0;
1525                release_sock(sk);
1526                break;
1527        }
1528
1529        case SIOCX25SCALLUSERDATA: {
1530                struct x25_calluserdata calluserdata;
1531
1532                rc = -EFAULT;
1533                if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1534                        break;
1535                rc = -EINVAL;
1536                if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1537                        break;
1538                lock_sock(sk);
1539                x25->calluserdata = calluserdata;
1540                release_sock(sk);
1541                rc = 0;
1542                break;
1543        }
1544
1545        case SIOCX25GCAUSEDIAG: {
1546                lock_sock(sk);
1547                rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1548                        ? -EFAULT : 0;
1549                release_sock(sk);
1550                break;
1551        }
1552
1553        case SIOCX25SCAUSEDIAG: {
1554                struct x25_causediag causediag;
1555                rc = -EFAULT;
1556                if (copy_from_user(&causediag, argp, sizeof(causediag)))
1557                        break;
1558                lock_sock(sk);
1559                x25->causediag = causediag;
1560                release_sock(sk);
1561                rc = 0;
1562                break;
1563
1564        }
1565
1566        case SIOCX25SCUDMATCHLEN: {
1567                struct x25_subaddr sub_addr;
1568                rc = -EINVAL;
1569                lock_sock(sk);
1570                if(sk->sk_state != TCP_CLOSE)
1571                        goto out_cud_release;
1572                rc = -EFAULT;
1573                if (copy_from_user(&sub_addr, argp,
1574                                   sizeof(sub_addr)))
1575                        goto out_cud_release;
1576                rc = -EINVAL;
1577                if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1578                        goto out_cud_release;
1579                x25->cudmatchlength = sub_addr.cudmatchlength;
1580                rc = 0;
1581out_cud_release:
1582                release_sock(sk);
1583                break;
1584        }
1585
1586        case SIOCX25CALLACCPTAPPRV: {
1587                rc = -EINVAL;
1588                lock_sock(sk);
1589                if (sk->sk_state != TCP_CLOSE)
1590                        break;
1591                clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1592                release_sock(sk);
1593                rc = 0;
1594                break;
1595        }
1596
1597        case SIOCX25SENDCALLACCPT:  {
1598                rc = -EINVAL;
1599                lock_sock(sk);
1600                if (sk->sk_state != TCP_ESTABLISHED)
1601                        break;
1602                /* must call accptapprv above */
1603                if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1604                        break;
1605                x25_write_internal(sk, X25_CALL_ACCEPTED);
1606                x25->state = X25_STATE_3;
1607                release_sock(sk);
1608                rc = 0;
1609                break;
1610        }
1611
1612        default:
1613                rc = -ENOIOCTLCMD;
1614                break;
1615        }
1616
1617        return rc;
1618}
1619
1620static const struct net_proto_family x25_family_ops = {
1621        .family =       AF_X25,
1622        .create =       x25_create,
1623        .owner  =       THIS_MODULE,
1624};
1625
1626#ifdef CONFIG_COMPAT
1627static int compat_x25_subscr_ioctl(unsigned int cmd,
1628                struct compat_x25_subscrip_struct __user *x25_subscr32)
1629{
1630        struct compat_x25_subscrip_struct x25_subscr;
1631        struct x25_neigh *nb;
1632        struct net_device *dev;
1633        int rc = -EINVAL;
1634
1635        rc = -EFAULT;
1636        if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1637                goto out;
1638
1639        rc = -EINVAL;
1640        dev = x25_dev_get(x25_subscr.device);
1641        if (dev == NULL)
1642                goto out;
1643
1644        nb = x25_get_neigh(dev);
1645        if (nb == NULL)
1646                goto out_dev_put;
1647
1648        dev_put(dev);
1649
1650        if (cmd == SIOCX25GSUBSCRIP) {
1651                read_lock_bh(&x25_neigh_list_lock);
1652                x25_subscr.extended = nb->extended;
1653                x25_subscr.global_facil_mask = nb->global_facil_mask;
1654                read_unlock_bh(&x25_neigh_list_lock);
1655                rc = copy_to_user(x25_subscr32, &x25_subscr,
1656                                sizeof(*x25_subscr32)) ? -EFAULT : 0;
1657        } else {
1658                rc = -EINVAL;
1659                if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1660                        rc = 0;
1661                        write_lock_bh(&x25_neigh_list_lock);
1662                        nb->extended = x25_subscr.extended;
1663                        nb->global_facil_mask = x25_subscr.global_facil_mask;
1664                        write_unlock_bh(&x25_neigh_list_lock);
1665                }
1666        }
1667        x25_neigh_put(nb);
1668out:
1669        return rc;
1670out_dev_put:
1671        dev_put(dev);
1672        goto out;
1673}
1674
1675static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1676                                unsigned long arg)
1677{
1678        void __user *argp = compat_ptr(arg);
1679        struct sock *sk = sock->sk;
1680
1681        int rc = -ENOIOCTLCMD;
1682
1683        switch(cmd) {
1684        case TIOCOUTQ:
1685        case TIOCINQ:
1686                rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1687                break;
1688        case SIOCGSTAMP:
1689                rc = -EINVAL;
1690                if (sk)
1691                        rc = compat_sock_get_timestamp(sk,
1692                                        (struct timeval __user*)argp);
1693                break;
1694        case SIOCGSTAMPNS:
1695                rc = -EINVAL;
1696                if (sk)
1697                        rc = compat_sock_get_timestampns(sk,
1698                                        (struct timespec __user*)argp);
1699                break;
1700        case SIOCGIFADDR:
1701        case SIOCSIFADDR:
1702        case SIOCGIFDSTADDR:
1703        case SIOCSIFDSTADDR:
1704        case SIOCGIFBRDADDR:
1705        case SIOCSIFBRDADDR:
1706        case SIOCGIFNETMASK:
1707        case SIOCSIFNETMASK:
1708        case SIOCGIFMETRIC:
1709        case SIOCSIFMETRIC:
1710                rc = -EINVAL;
1711                break;
1712        case SIOCADDRT:
1713        case SIOCDELRT:
1714                rc = -EPERM;
1715                if (!capable(CAP_NET_ADMIN))
1716                        break;
1717                rc = x25_route_ioctl(cmd, argp);
1718                break;
1719        case SIOCX25GSUBSCRIP:
1720                rc = compat_x25_subscr_ioctl(cmd, argp);
1721                break;
1722        case SIOCX25SSUBSCRIP:
1723                rc = -EPERM;
1724                if (!capable(CAP_NET_ADMIN))
1725                        break;
1726                rc = compat_x25_subscr_ioctl(cmd, argp);
1727                break;
1728        case SIOCX25GFACILITIES:
1729        case SIOCX25SFACILITIES:
1730        case SIOCX25GDTEFACILITIES:
1731        case SIOCX25SDTEFACILITIES:
1732        case SIOCX25GCALLUSERDATA:
1733        case SIOCX25SCALLUSERDATA:
1734        case SIOCX25GCAUSEDIAG:
1735        case SIOCX25SCAUSEDIAG:
1736        case SIOCX25SCUDMATCHLEN:
1737        case SIOCX25CALLACCPTAPPRV:
1738        case SIOCX25SENDCALLACCPT:
1739                rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1740                break;
1741        default:
1742                rc = -ENOIOCTLCMD;
1743                break;
1744        }
1745        return rc;
1746}
1747#endif
1748
1749static const struct proto_ops x25_proto_ops = {
1750        .family =       AF_X25,
1751        .owner =        THIS_MODULE,
1752        .release =      x25_release,
1753        .bind =         x25_bind,
1754        .connect =      x25_connect,
1755        .socketpair =   sock_no_socketpair,
1756        .accept =       x25_accept,
1757        .getname =      x25_getname,
1758        .poll =         datagram_poll,
1759        .ioctl =        x25_ioctl,
1760#ifdef CONFIG_COMPAT
1761        .compat_ioctl = compat_x25_ioctl,
1762#endif
1763        .listen =       x25_listen,
1764        .shutdown =     sock_no_shutdown,
1765        .setsockopt =   x25_setsockopt,
1766        .getsockopt =   x25_getsockopt,
1767        .sendmsg =      x25_sendmsg,
1768        .recvmsg =      x25_recvmsg,
1769        .mmap =         sock_no_mmap,
1770        .sendpage =     sock_no_sendpage,
1771};
1772
1773static struct packet_type x25_packet_type __read_mostly = {
1774        .type = cpu_to_be16(ETH_P_X25),
1775        .func = x25_lapb_receive_frame,
1776};
1777
1778static struct notifier_block x25_dev_notifier = {
1779        .notifier_call = x25_device_event,
1780};
1781
1782void x25_kill_by_neigh(struct x25_neigh *nb)
1783{
1784        struct sock *s;
1785        struct hlist_node *node;
1786
1787        write_lock_bh(&x25_list_lock);
1788
1789        sk_for_each(s, node, &x25_list)
1790                if (x25_sk(s)->neighbour == nb)
1791                        x25_disconnect(s, ENETUNREACH, 0, 0);
1792
1793        write_unlock_bh(&x25_list_lock);
1794
1795        /* Remove any related forwards */
1796        x25_clear_forward_by_dev(nb->dev);
1797}
1798
1799static int __init x25_init(void)
1800{
1801        int rc = proto_register(&x25_proto, 0);
1802
1803        if (rc != 0)
1804                goto out;
1805
1806        rc = sock_register(&x25_family_ops);
1807        if (rc != 0)
1808                goto out_proto;
1809
1810        dev_add_pack(&x25_packet_type);
1811
1812        rc = register_netdevice_notifier(&x25_dev_notifier);
1813        if (rc != 0)
1814                goto out_sock;
1815
1816        printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1817
1818        x25_register_sysctl();
1819        rc = x25_proc_init();
1820        if (rc != 0)
1821                goto out_dev;
1822out:
1823        return rc;
1824out_dev:
1825        unregister_netdevice_notifier(&x25_dev_notifier);
1826out_sock:
1827        sock_unregister(AF_X25);
1828out_proto:
1829        proto_unregister(&x25_proto);
1830        goto out;
1831}
1832module_init(x25_init);
1833
1834static void __exit x25_exit(void)
1835{
1836        x25_proc_exit();
1837        x25_link_free();
1838        x25_route_free();
1839
1840        x25_unregister_sysctl();
1841
1842        unregister_netdevice_notifier(&x25_dev_notifier);
1843
1844        dev_remove_pack(&x25_packet_type);
1845
1846        sock_unregister(AF_X25);
1847        proto_unregister(&x25_proto);
1848}
1849module_exit(x25_exit);
1850
1851MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1852MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1853MODULE_LICENSE("GPL");
1854MODULE_ALIAS_NETPROTO(PF_X25);
1855
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.