linux/net/x25/af_x25.c
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   1/*
   2 *      X.25 Packet Layer release 002
   3 *
   4 *      This is ALPHA test software. This code may break your machine,
   5 *      randomly fail to work with new releases, misbehave and/or generally
   6 *      screw up. It might even work.
   7 *
   8 *      This code REQUIRES 2.1.15 or higher
   9 *
  10 *      This module:
  11 *              This module is free software; you can redistribute it and/or
  12 *              modify it under the terms of the GNU General Public License
  13 *              as published by the Free Software Foundation; either version
  14 *              2 of the License, or (at your option) any later version.
  15 *
  16 *      History
  17 *      X.25 001        Jonathan Naylor Started coding.
  18 *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  19 *                                      New timer architecture.
  20 *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  21 *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  22 *                                        facilities negotiation and increased
  23 *                                        the throughput upper limit.
  24 *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  25 *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  26 *                                      Fixed x25_output() related skb leakage.
  27 *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  28 *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  29 *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  30 *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  31 *                                      x25_proc.c, using seq_file
  32 *      2005-04-02      Shaun Pereira   Selective sub address matching
  33 *                                      with call user data
  34 *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  35 *                                      response
  36 */
  37
  38#include <linux/module.h>
  39#include <linux/capability.h>
  40#include <linux/errno.h>
  41#include <linux/kernel.h>
  42#include <linux/sched.h>
  43#include <linux/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
 212        write_lock_bh(&x25_list_lock);
 213
 214        sk_for_each(s, &x25_list)
 215                if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 216                        x25_disconnect(s, ENETUNREACH, 0, 0);
 217
 218        write_unlock_bh(&x25_list_lock);
 219}
 220
 221/*
 222 *      Handle device status changes.
 223 */
 224static int x25_device_event(struct notifier_block *this, unsigned long event,
 225                            void *ptr)
 226{
 227        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 228        struct x25_neigh *nb;
 229
 230        if (!net_eq(dev_net(dev), &init_net))
 231                return NOTIFY_DONE;
 232
 233        if (dev->type == ARPHRD_X25
 234#if IS_ENABLED(CONFIG_LLC)
 235         || dev->type == ARPHRD_ETHER
 236#endif
 237         ) {
 238                switch (event) {
 239                case NETDEV_UP:
 240                        x25_link_device_up(dev);
 241                        break;
 242                case NETDEV_GOING_DOWN:
 243                        nb = x25_get_neigh(dev);
 244                        if (nb) {
 245                                x25_terminate_link(nb);
 246                                x25_neigh_put(nb);
 247                        }
 248                        break;
 249                case NETDEV_DOWN:
 250                        x25_kill_by_device(dev);
 251                        x25_route_device_down(dev);
 252                        x25_link_device_down(dev);
 253                        break;
 254                }
 255        }
 256
 257        return NOTIFY_DONE;
 258}
 259
 260/*
 261 *      Add a socket to the bound sockets list.
 262 */
 263static void x25_insert_socket(struct sock *sk)
 264{
 265        write_lock_bh(&x25_list_lock);
 266        sk_add_node(sk, &x25_list);
 267        write_unlock_bh(&x25_list_lock);
 268}
 269
 270/*
 271 *      Find a socket that wants to accept the Call Request we just
 272 *      received. Check the full list for an address/cud match.
 273 *      If no cuds match return the next_best thing, an address match.
 274 *      Note: if a listening socket has cud set it must only get calls
 275 *      with matching cud.
 276 */
 277static struct sock *x25_find_listener(struct x25_address *addr,
 278                                        struct sk_buff *skb)
 279{
 280        struct sock *s;
 281        struct sock *next_best;
 282
 283        read_lock_bh(&x25_list_lock);
 284        next_best = NULL;
 285
 286        sk_for_each(s, &x25_list)
 287                if ((!strcmp(addr->x25_addr,
 288                        x25_sk(s)->source_addr.x25_addr) ||
 289                                !strcmp(addr->x25_addr,
 290                                        null_x25_address.x25_addr)) &&
 291                                        s->sk_state == TCP_LISTEN) {
 292                        /*
 293                         * Found a listening socket, now check the incoming
 294                         * call user data vs this sockets call user data
 295                         */
 296                        if (x25_sk(s)->cudmatchlength > 0 &&
 297                                skb->len >= x25_sk(s)->cudmatchlength) {
 298                                if((memcmp(x25_sk(s)->calluserdata.cuddata,
 299                                        skb->data,
 300                                        x25_sk(s)->cudmatchlength)) == 0) {
 301                                        sock_hold(s);
 302                                        goto found;
 303                                 }
 304                        } else
 305                                next_best = s;
 306                }
 307        if (next_best) {
 308                s = next_best;
 309                sock_hold(s);
 310                goto found;
 311        }
 312        s = NULL;
 313found:
 314        read_unlock_bh(&x25_list_lock);
 315        return s;
 316}
 317
 318/*
 319 *      Find a connected X.25 socket given my LCI and neighbour.
 320 */
 321static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 322{
 323        struct sock *s;
 324
 325        sk_for_each(s, &x25_list)
 326                if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 327                        sock_hold(s);
 328                        goto found;
 329                }
 330        s = NULL;
 331found:
 332        return s;
 333}
 334
 335struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 336{
 337        struct sock *s;
 338
 339        read_lock_bh(&x25_list_lock);
 340        s = __x25_find_socket(lci, nb);
 341        read_unlock_bh(&x25_list_lock);
 342        return s;
 343}
 344
 345/*
 346 *      Find a unique LCI for a given device.
 347 */
 348static unsigned int x25_new_lci(struct x25_neigh *nb)
 349{
 350        unsigned int lci = 1;
 351        struct sock *sk;
 352
 353        read_lock_bh(&x25_list_lock);
 354
 355        while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 356                sock_put(sk);
 357                if (++lci == 4096) {
 358                        lci = 0;
 359                        break;
 360                }
 361        }
 362
 363        read_unlock_bh(&x25_list_lock);
 364        return lci;
 365}
 366
 367/*
 368 *      Deferred destroy.
 369 */
 370static void __x25_destroy_socket(struct sock *);
 371
 372/*
 373 *      handler for deferred kills.
 374 */
 375static void x25_destroy_timer(unsigned long data)
 376{
 377        x25_destroy_socket_from_timer((struct sock *)data);
 378}
 379
 380/*
 381 *      This is called from user mode and the timers. Thus it protects itself
 382 *      against interrupt users but doesn't worry about being called during
 383 *      work. Once it is removed from the queue no interrupt or bottom half
 384 *      will touch it and we are (fairly 8-) ) safe.
 385 *      Not static as it's used by the timer
 386 */
 387static void __x25_destroy_socket(struct sock *sk)
 388{
 389        struct sk_buff *skb;
 390
 391        x25_stop_heartbeat(sk);
 392        x25_stop_timer(sk);
 393
 394        x25_remove_socket(sk);
 395        x25_clear_queues(sk);           /* Flush the queues */
 396
 397        while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 398                if (skb->sk != sk) {            /* A pending connection */
 399                        /*
 400                         * Queue the unaccepted socket for death
 401                         */
 402                        skb->sk->sk_state = TCP_LISTEN;
 403                        sock_set_flag(skb->sk, SOCK_DEAD);
 404                        x25_start_heartbeat(skb->sk);
 405                        x25_sk(skb->sk)->state = X25_STATE_0;
 406                }
 407
 408                kfree_skb(skb);
 409        }
 410
 411        if (sk_has_allocations(sk)) {
 412                /* Defer: outstanding buffers */
 413                sk->sk_timer.expires  = jiffies + 10 * HZ;
 414                sk->sk_timer.function = x25_destroy_timer;
 415                sk->sk_timer.data = (unsigned long)sk;
 416                add_timer(&sk->sk_timer);
 417        } else {
 418                /* drop last reference so sock_put will free */
 419                __sock_put(sk);
 420        }
 421}
 422
 423void x25_destroy_socket_from_timer(struct sock *sk)
 424{
 425        sock_hold(sk);
 426        bh_lock_sock(sk);
 427        __x25_destroy_socket(sk);
 428        bh_unlock_sock(sk);
 429        sock_put(sk);
 430}
 431
 432/*
 433 *      Handling for system calls applied via the various interfaces to a
 434 *      X.25 socket object.
 435 */
 436
 437static int x25_setsockopt(struct socket *sock, int level, int optname,
 438                          char __user *optval, unsigned int optlen)
 439{
 440        int opt;
 441        struct sock *sk = sock->sk;
 442        int rc = -ENOPROTOOPT;
 443
 444        if (level != SOL_X25 || optname != X25_QBITINCL)
 445                goto out;
 446
 447        rc = -EINVAL;
 448        if (optlen < sizeof(int))
 449                goto out;
 450
 451        rc = -EFAULT;
 452        if (get_user(opt, (int __user *)optval))
 453                goto out;
 454
 455        if (opt)
 456                set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 457        else
 458                clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 459        rc = 0;
 460out:
 461        return rc;
 462}
 463
 464static int x25_getsockopt(struct socket *sock, int level, int optname,
 465                          char __user *optval, int __user *optlen)
 466{
 467        struct sock *sk = sock->sk;
 468        int val, len, rc = -ENOPROTOOPT;
 469
 470        if (level != SOL_X25 || optname != X25_QBITINCL)
 471                goto out;
 472
 473        rc = -EFAULT;
 474        if (get_user(len, optlen))
 475                goto out;
 476
 477        len = min_t(unsigned int, len, sizeof(int));
 478
 479        rc = -EINVAL;
 480        if (len < 0)
 481                goto out;
 482
 483        rc = -EFAULT;
 484        if (put_user(len, optlen))
 485                goto out;
 486
 487        val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 488        rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 489out:
 490        return rc;
 491}
 492
 493static int x25_listen(struct socket *sock, int backlog)
 494{
 495        struct sock *sk = sock->sk;
 496        int rc = -EOPNOTSUPP;
 497
 498        lock_sock(sk);
 499        if (sk->sk_state != TCP_LISTEN) {
 500                memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 501                sk->sk_max_ack_backlog = backlog;
 502                sk->sk_state           = TCP_LISTEN;
 503                rc = 0;
 504        }
 505        release_sock(sk);
 506
 507        return rc;
 508}
 509
 510static struct proto x25_proto = {
 511        .name     = "X25",
 512        .owner    = THIS_MODULE,
 513        .obj_size = sizeof(struct x25_sock),
 514};
 515
 516static struct sock *x25_alloc_socket(struct net *net)
 517{
 518        struct x25_sock *x25;
 519        struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto);
 520
 521        if (!sk)
 522                goto out;
 523
 524        sock_init_data(NULL, sk);
 525
 526        x25 = x25_sk(sk);
 527        skb_queue_head_init(&x25->ack_queue);
 528        skb_queue_head_init(&x25->fragment_queue);
 529        skb_queue_head_init(&x25->interrupt_in_queue);
 530        skb_queue_head_init(&x25->interrupt_out_queue);
 531out:
 532        return sk;
 533}
 534
 535static int x25_create(struct net *net, struct socket *sock, int protocol,
 536                      int kern)
 537{
 538        struct sock *sk;
 539        struct x25_sock *x25;
 540        int rc = -EAFNOSUPPORT;
 541
 542        if (!net_eq(net, &init_net))
 543                goto out;
 544
 545        rc = -ESOCKTNOSUPPORT;
 546        if (sock->type != SOCK_SEQPACKET)
 547                goto out;
 548
 549        rc = -EINVAL;
 550        if (protocol)
 551                goto out;
 552
 553        rc = -ENOBUFS;
 554        if ((sk = x25_alloc_socket(net)) == NULL)
 555                goto out;
 556
 557        x25 = x25_sk(sk);
 558
 559        sock_init_data(sock, sk);
 560
 561        x25_init_timers(sk);
 562
 563        sock->ops    = &x25_proto_ops;
 564        sk->sk_protocol = protocol;
 565        sk->sk_backlog_rcv = x25_backlog_rcv;
 566
 567        x25->t21   = sysctl_x25_call_request_timeout;
 568        x25->t22   = sysctl_x25_reset_request_timeout;
 569        x25->t23   = sysctl_x25_clear_request_timeout;
 570        x25->t2    = sysctl_x25_ack_holdback_timeout;
 571        x25->state = X25_STATE_0;
 572        x25->cudmatchlength = 0;
 573        set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 574                                                        /* on call accept   */
 575
 576        x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 577        x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 578        x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 579        x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 580        x25->facilities.throughput  = 0;        /* by default don't negotiate
 581                                                   throughput */
 582        x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 583        x25->dte_facilities.calling_len = 0;
 584        x25->dte_facilities.called_len = 0;
 585        memset(x25->dte_facilities.called_ae, '\0',
 586                        sizeof(x25->dte_facilities.called_ae));
 587        memset(x25->dte_facilities.calling_ae, '\0',
 588                        sizeof(x25->dte_facilities.calling_ae));
 589
 590        rc = 0;
 591out:
 592        return rc;
 593}
 594
 595static struct sock *x25_make_new(struct sock *osk)
 596{
 597        struct sock *sk = NULL;
 598        struct x25_sock *x25, *ox25;
 599
 600        if (osk->sk_type != SOCK_SEQPACKET)
 601                goto out;
 602
 603        if ((sk = x25_alloc_socket(sock_net(osk))) == NULL)
 604                goto out;
 605
 606        x25 = x25_sk(sk);
 607
 608        sk->sk_type        = osk->sk_type;
 609        sk->sk_priority    = osk->sk_priority;
 610        sk->sk_protocol    = osk->sk_protocol;
 611        sk->sk_rcvbuf      = osk->sk_rcvbuf;
 612        sk->sk_sndbuf      = osk->sk_sndbuf;
 613        sk->sk_state       = TCP_ESTABLISHED;
 614        sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 615        sock_copy_flags(sk, osk);
 616
 617        ox25 = x25_sk(osk);
 618        x25->t21        = ox25->t21;
 619        x25->t22        = ox25->t22;
 620        x25->t23        = ox25->t23;
 621        x25->t2         = ox25->t2;
 622        x25->flags      = ox25->flags;
 623        x25->facilities = ox25->facilities;
 624        x25->dte_facilities = ox25->dte_facilities;
 625        x25->cudmatchlength = ox25->cudmatchlength;
 626
 627        clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 628        x25_init_timers(sk);
 629out:
 630        return sk;
 631}
 632
 633static int x25_release(struct socket *sock)
 634{
 635        struct sock *sk = sock->sk;
 636        struct x25_sock *x25;
 637
 638        if (!sk)
 639                return 0;
 640
 641        x25 = x25_sk(sk);
 642
 643        sock_hold(sk);
 644        lock_sock(sk);
 645        switch (x25->state) {
 646
 647                case X25_STATE_0:
 648                case X25_STATE_2:
 649                        x25_disconnect(sk, 0, 0, 0);
 650                        __x25_destroy_socket(sk);
 651                        goto out;
 652
 653                case X25_STATE_1:
 654                case X25_STATE_3:
 655                case X25_STATE_4:
 656                        x25_clear_queues(sk);
 657                        x25_write_internal(sk, X25_CLEAR_REQUEST);
 658                        x25_start_t23timer(sk);
 659                        x25->state = X25_STATE_2;
 660                        sk->sk_state    = TCP_CLOSE;
 661                        sk->sk_shutdown |= SEND_SHUTDOWN;
 662                        sk->sk_state_change(sk);
 663                        sock_set_flag(sk, SOCK_DEAD);
 664                        sock_set_flag(sk, SOCK_DESTROY);
 665                        break;
 666        }
 667
 668        sock_orphan(sk);
 669out:
 670        release_sock(sk);
 671        sock_put(sk);
 672        return 0;
 673}
 674
 675static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 676{
 677        struct sock *sk = sock->sk;
 678        struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 679        int len, i, rc = 0;
 680
 681        if (!sock_flag(sk, SOCK_ZAPPED) ||
 682            addr_len != sizeof(struct sockaddr_x25) ||
 683            addr->sx25_family != AF_X25) {
 684                rc = -EINVAL;
 685                goto out;
 686        }
 687
 688        len = strlen(addr->sx25_addr.x25_addr);
 689        for (i = 0; i < len; i++) {
 690                if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 691                        rc = -EINVAL;
 692                        goto out;
 693                }
 694        }
 695
 696        lock_sock(sk);
 697        x25_sk(sk)->source_addr = addr->sx25_addr;
 698        x25_insert_socket(sk);
 699        sock_reset_flag(sk, SOCK_ZAPPED);
 700        release_sock(sk);
 701        SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 702out:
 703        return rc;
 704}
 705
 706static int x25_wait_for_connection_establishment(struct sock *sk)
 707{
 708        DECLARE_WAITQUEUE(wait, current);
 709        int rc;
 710
 711        add_wait_queue_exclusive(sk_sleep(sk), &wait);
 712        for (;;) {
 713                __set_current_state(TASK_INTERRUPTIBLE);
 714                rc = -ERESTARTSYS;
 715                if (signal_pending(current))
 716                        break;
 717                rc = sock_error(sk);
 718                if (rc) {
 719                        sk->sk_socket->state = SS_UNCONNECTED;
 720                        break;
 721                }
 722                rc = 0;
 723                if (sk->sk_state != TCP_ESTABLISHED) {
 724                        release_sock(sk);
 725                        schedule();
 726                        lock_sock(sk);
 727                } else
 728                        break;
 729        }
 730        __set_current_state(TASK_RUNNING);
 731        remove_wait_queue(sk_sleep(sk), &wait);
 732        return rc;
 733}
 734
 735static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 736                       int addr_len, int flags)
 737{
 738        struct sock *sk = sock->sk;
 739        struct x25_sock *x25 = x25_sk(sk);
 740        struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 741        struct x25_route *rt;
 742        int rc = 0;
 743
 744        lock_sock(sk);
 745        if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 746                sock->state = SS_CONNECTED;
 747                goto out; /* Connect completed during a ERESTARTSYS event */
 748        }
 749
 750        rc = -ECONNREFUSED;
 751        if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 752                sock->state = SS_UNCONNECTED;
 753                goto out;
 754        }
 755
 756        rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 757        if (sk->sk_state == TCP_ESTABLISHED)
 758                goto out;
 759
 760        sk->sk_state   = TCP_CLOSE;
 761        sock->state = SS_UNCONNECTED;
 762
 763        rc = -EINVAL;
 764        if (addr_len != sizeof(struct sockaddr_x25) ||
 765            addr->sx25_family != AF_X25)
 766                goto out;
 767
 768        rc = -ENETUNREACH;
 769        rt = x25_get_route(&addr->sx25_addr);
 770        if (!rt)
 771                goto out;
 772
 773        x25->neighbour = x25_get_neigh(rt->dev);
 774        if (!x25->neighbour)
 775                goto out_put_route;
 776
 777        x25_limit_facilities(&x25->facilities, x25->neighbour);
 778
 779        x25->lci = x25_new_lci(x25->neighbour);
 780        if (!x25->lci)
 781                goto out_put_neigh;
 782
 783        rc = -EINVAL;
 784        if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 785                goto out_put_neigh;
 786
 787        if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 788                memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 789
 790        x25->dest_addr = addr->sx25_addr;
 791
 792        /* Move to connecting socket, start sending Connect Requests */
 793        sock->state   = SS_CONNECTING;
 794        sk->sk_state  = TCP_SYN_SENT;
 795
 796        x25->state = X25_STATE_1;
 797
 798        x25_write_internal(sk, X25_CALL_REQUEST);
 799
 800        x25_start_heartbeat(sk);
 801        x25_start_t21timer(sk);
 802
 803        /* Now the loop */
 804        rc = -EINPROGRESS;
 805        if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 806                goto out_put_neigh;
 807
 808        rc = x25_wait_for_connection_establishment(sk);
 809        if (rc)
 810                goto out_put_neigh;
 811
 812        sock->state = SS_CONNECTED;
 813        rc = 0;
 814out_put_neigh:
 815        if (rc)
 816                x25_neigh_put(x25->neighbour);
 817out_put_route:
 818        x25_route_put(rt);
 819out:
 820        release_sock(sk);
 821        return rc;
 822}
 823
 824static int x25_wait_for_data(struct sock *sk, long timeout)
 825{
 826        DECLARE_WAITQUEUE(wait, current);
 827        int rc = 0;
 828
 829        add_wait_queue_exclusive(sk_sleep(sk), &wait);
 830        for (;;) {
 831                __set_current_state(TASK_INTERRUPTIBLE);
 832                if (sk->sk_shutdown & RCV_SHUTDOWN)
 833                        break;
 834                rc = -ERESTARTSYS;
 835                if (signal_pending(current))
 836                        break;
 837                rc = -EAGAIN;
 838                if (!timeout)
 839                        break;
 840                rc = 0;
 841                if (skb_queue_empty(&sk->sk_receive_queue)) {
 842                        release_sock(sk);
 843                        timeout = schedule_timeout(timeout);
 844                        lock_sock(sk);
 845                } else
 846                        break;
 847        }
 848        __set_current_state(TASK_RUNNING);
 849        remove_wait_queue(sk_sleep(sk), &wait);
 850        return rc;
 851}
 852
 853static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 854{
 855        struct sock *sk = sock->sk;
 856        struct sock *newsk;
 857        struct sk_buff *skb;
 858        int rc = -EINVAL;
 859
 860        if (!sk)
 861                goto out;
 862
 863        rc = -EOPNOTSUPP;
 864        if (sk->sk_type != SOCK_SEQPACKET)
 865                goto out;
 866
 867        lock_sock(sk);
 868        rc = -EINVAL;
 869        if (sk->sk_state != TCP_LISTEN)
 870                goto out2;
 871
 872        rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 873        if (rc)
 874                goto out2;
 875        skb = skb_dequeue(&sk->sk_receive_queue);
 876        rc = -EINVAL;
 877        if (!skb->sk)
 878                goto out2;
 879        newsk            = skb->sk;
 880        sock_graft(newsk, newsock);
 881
 882        /* Now attach up the new socket */
 883        skb->sk = NULL;
 884        kfree_skb(skb);
 885        sk->sk_ack_backlog--;
 886        newsock->state = SS_CONNECTED;
 887        rc = 0;
 888out2:
 889        release_sock(sk);
 890out:
 891        return rc;
 892}
 893
 894static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 895                       int *uaddr_len, int peer)
 896{
 897        struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 898        struct sock *sk = sock->sk;
 899        struct x25_sock *x25 = x25_sk(sk);
 900        int rc = 0;
 901
 902        if (peer) {
 903                if (sk->sk_state != TCP_ESTABLISHED) {
 904                        rc = -ENOTCONN;
 905                        goto out;
 906                }
 907                sx25->sx25_addr = x25->dest_addr;
 908        } else
 909                sx25->sx25_addr = x25->source_addr;
 910
 911        sx25->sx25_family = AF_X25;
 912        *uaddr_len = sizeof(*sx25);
 913
 914out:
 915        return rc;
 916}
 917
 918int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 919                        unsigned int lci)
 920{
 921        struct sock *sk;
 922        struct sock *make;
 923        struct x25_sock *makex25;
 924        struct x25_address source_addr, dest_addr;
 925        struct x25_facilities facilities;
 926        struct x25_dte_facilities dte_facilities;
 927        int len, addr_len, rc;
 928
 929        /*
 930         *      Remove the LCI and frame type.
 931         */
 932        skb_pull(skb, X25_STD_MIN_LEN);
 933
 934        /*
 935         *      Extract the X.25 addresses and convert them to ASCII strings,
 936         *      and remove them.
 937         *
 938         *      Address block is mandatory in call request packets
 939         */
 940        addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 941        if (addr_len <= 0)
 942                goto out_clear_request;
 943        skb_pull(skb, addr_len);
 944
 945        /*
 946         *      Get the length of the facilities, skip past them for the moment
 947         *      get the call user data because this is needed to determine
 948         *      the correct listener
 949         *
 950         *      Facilities length is mandatory in call request packets
 951         */
 952        if (!pskb_may_pull(skb, 1))
 953                goto out_clear_request;
 954        len = skb->data[0] + 1;
 955        if (!pskb_may_pull(skb, len))
 956                goto out_clear_request;
 957        skb_pull(skb,len);
 958
 959        /*
 960         *      Ensure that the amount of call user data is valid.
 961         */
 962        if (skb->len > X25_MAX_CUD_LEN)
 963                goto out_clear_request;
 964
 965        /*
 966         *      Get all the call user data so it can be used in
 967         *      x25_find_listener and skb_copy_from_linear_data up ahead.
 968         */
 969        if (!pskb_may_pull(skb, skb->len))
 970                goto out_clear_request;
 971
 972        /*
 973         *      Find a listener for the particular address/cud pair.
 974         */
 975        sk = x25_find_listener(&source_addr,skb);
 976        skb_push(skb,len);
 977
 978        if (sk != NULL && sk_acceptq_is_full(sk)) {
 979                goto out_sock_put;
 980        }
 981
 982        /*
 983         *      We dont have any listeners for this incoming call.
 984         *      Try forwarding it.
 985         */
 986        if (sk == NULL) {
 987                skb_push(skb, addr_len + X25_STD_MIN_LEN);
 988                if (sysctl_x25_forward &&
 989                                x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 990                {
 991                        /* Call was forwarded, dont process it any more */
 992                        kfree_skb(skb);
 993                        rc = 1;
 994                        goto out;
 995                } else {
 996                        /* No listeners, can't forward, clear the call */
 997                        goto out_clear_request;
 998                }
 999        }
1000
1001        /*
1002         *      Try to reach a compromise on the requested facilities.
1003         */
1004        len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1005        if (len == -1)
1006                goto out_sock_put;
1007
1008        /*
1009         * current neighbour/link might impose additional limits
1010         * on certain facilties
1011         */
1012
1013        x25_limit_facilities(&facilities, nb);
1014
1015        /*
1016         *      Try to create a new socket.
1017         */
1018        make = x25_make_new(sk);
1019        if (!make)
1020                goto out_sock_put;
1021
1022        /*
1023         *      Remove the facilities
1024         */
1025        skb_pull(skb, len);
1026
1027        skb->sk     = make;
1028        make->sk_state = TCP_ESTABLISHED;
1029
1030        makex25 = x25_sk(make);
1031        makex25->lci           = lci;
1032        makex25->dest_addr     = dest_addr;
1033        makex25->source_addr   = source_addr;
1034        makex25->neighbour     = nb;
1035        makex25->facilities    = facilities;
1036        makex25->dte_facilities= dte_facilities;
1037        makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1038        /* ensure no reverse facil on accept */
1039        makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1040        /* ensure no calling address extension on accept */
1041        makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1042        makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1043
1044        /* Normally all calls are accepted immediately */
1045        if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1046                x25_write_internal(make, X25_CALL_ACCEPTED);
1047                makex25->state = X25_STATE_3;
1048        }
1049
1050        /*
1051         *      Incoming Call User Data.
1052         */
1053        skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1054        makex25->calluserdata.cudlength = skb->len;
1055
1056        sk->sk_ack_backlog++;
1057
1058        x25_insert_socket(make);
1059
1060        skb_queue_head(&sk->sk_receive_queue, skb);
1061
1062        x25_start_heartbeat(make);
1063
1064        if (!sock_flag(sk, SOCK_DEAD))
1065                sk->sk_data_ready(sk, skb->len);
1066        rc = 1;
1067        sock_put(sk);
1068out:
1069        return rc;
1070out_sock_put:
1071        sock_put(sk);
1072out_clear_request:
1073        rc = 0;
1074        x25_transmit_clear_request(nb, lci, 0x01);
1075        goto out;
1076}
1077
1078static int x25_sendmsg(struct kiocb *iocb, struct socket *sock,
1079                       struct msghdr *msg, size_t len)
1080{
1081        struct sock *sk = sock->sk;
1082        struct x25_sock *x25 = x25_sk(sk);
1083        struct sockaddr_x25 *usx25 = (struct sockaddr_x25 *)msg->msg_name;
1084        struct sockaddr_x25 sx25;
1085        struct sk_buff *skb;
1086        unsigned char *asmptr;
1087        int noblock = msg->msg_flags & MSG_DONTWAIT;
1088        size_t size;
1089        int qbit = 0, rc = -EINVAL;
1090
1091        lock_sock(sk);
1092        if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1093                goto out;
1094
1095        /* we currently don't support segmented records at the user interface */
1096        if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1097                goto out;
1098
1099        rc = -EADDRNOTAVAIL;
1100        if (sock_flag(sk, SOCK_ZAPPED))
1101                goto out;
1102
1103        rc = -EPIPE;
1104        if (sk->sk_shutdown & SEND_SHUTDOWN) {
1105                send_sig(SIGPIPE, current, 0);
1106                goto out;
1107        }
1108
1109        rc = -ENETUNREACH;
1110        if (!x25->neighbour)
1111                goto out;
1112
1113        if (usx25) {
1114                rc = -EINVAL;
1115                if (msg->msg_namelen < sizeof(sx25))
1116                        goto out;
1117                memcpy(&sx25, usx25, sizeof(sx25));
1118                rc = -EISCONN;
1119                if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1120                        goto out;
1121                rc = -EINVAL;
1122                if (sx25.sx25_family != AF_X25)
1123                        goto out;
1124        } else {
1125                /*
1126                 *      FIXME 1003.1g - if the socket is like this because
1127                 *      it has become closed (not started closed) we ought
1128                 *      to SIGPIPE, EPIPE;
1129                 */
1130                rc = -ENOTCONN;
1131                if (sk->sk_state != TCP_ESTABLISHED)
1132                        goto out;
1133
1134                sx25.sx25_family = AF_X25;
1135                sx25.sx25_addr   = x25->dest_addr;
1136        }
1137
1138        /* Sanity check the packet size */
1139        if (len > 65535) {
1140                rc = -EMSGSIZE;
1141                goto out;
1142        }
1143
1144        SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1145
1146        /* Build a packet */
1147        SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1148
1149        if ((msg->msg_flags & MSG_OOB) && len > 32)
1150                len = 32;
1151
1152        size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1153
1154        release_sock(sk);
1155        skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1156        lock_sock(sk);
1157        if (!skb)
1158                goto out;
1159        X25_SKB_CB(skb)->flags = msg->msg_flags;
1160
1161        skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1162
1163        /*
1164         *      Put the data on the end
1165         */
1166        SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1167
1168        skb_reset_transport_header(skb);
1169        skb_put(skb, len);
1170
1171        rc = memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len);
1172        if (rc)
1173                goto out_kfree_skb;
1174
1175        /*
1176         *      If the Q BIT Include socket option is in force, the first
1177         *      byte of the user data is the logical value of the Q Bit.
1178         */
1179        if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1180                if (!pskb_may_pull(skb, 1))
1181                        goto out_kfree_skb;
1182
1183                qbit = skb->data[0];
1184                skb_pull(skb, 1);
1185        }
1186
1187        /*
1188         *      Push down the X.25 header
1189         */
1190        SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1191
1192        if (msg->msg_flags & MSG_OOB) {
1193                if (x25->neighbour->extended) {
1194                        asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1195                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1196                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1197                        *asmptr++ = X25_INTERRUPT;
1198                } else {
1199                        asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1200                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1201                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1202                        *asmptr++ = X25_INTERRUPT;
1203                }
1204        } else {
1205                if (x25->neighbour->extended) {
1206                        /* Build an Extended X.25 header */
1207                        asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1208                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1209                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1210                        *asmptr++ = X25_DATA;
1211                        *asmptr++ = X25_DATA;
1212                } else {
1213                        /* Build an Standard X.25 header */
1214                        asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1215                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1216                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1217                        *asmptr++ = X25_DATA;
1218                }
1219
1220                if (qbit)
1221                        skb->data[0] |= X25_Q_BIT;
1222        }
1223
1224        SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1225        SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1226
1227        rc = -ENOTCONN;
1228        if (sk->sk_state != TCP_ESTABLISHED)
1229                goto out_kfree_skb;
1230
1231        if (msg->msg_flags & MSG_OOB)
1232                skb_queue_tail(&x25->interrupt_out_queue, skb);
1233        else {
1234                rc = x25_output(sk, skb);
1235                len = rc;
1236                if (rc < 0)
1237                        kfree_skb(skb);
1238                else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1239                        len++;
1240        }
1241
1242        x25_kick(sk);
1243        rc = len;
1244out:
1245        release_sock(sk);
1246        return rc;
1247out_kfree_skb:
1248        kfree_skb(skb);
1249        goto out;
1250}
1251
1252
1253static int x25_recvmsg(struct kiocb *iocb, struct socket *sock,
1254                       struct msghdr *msg, size_t size,
1255                       int flags)
1256{
1257        struct sock *sk = sock->sk;
1258        struct x25_sock *x25 = x25_sk(sk);
1259        struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)msg->msg_name;
1260        size_t copied;
1261        int qbit, header_len;
1262        struct sk_buff *skb;
1263        unsigned char *asmptr;
1264        int rc = -ENOTCONN;
1265
1266        lock_sock(sk);
1267
1268        if (x25->neighbour == NULL)
1269                goto out;
1270
1271        header_len = x25->neighbour->extended ?
1272                X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1273
1274        /*
1275         * This works for seqpacket too. The receiver has ordered the queue for
1276         * us! We do one quick check first though
1277         */
1278        if (sk->sk_state != TCP_ESTABLISHED)
1279                goto out;
1280
1281        if (flags & MSG_OOB) {
1282                rc = -EINVAL;
1283                if (sock_flag(sk, SOCK_URGINLINE) ||
1284                    !skb_peek(&x25->interrupt_in_queue))
1285                        goto out;
1286
1287                skb = skb_dequeue(&x25->interrupt_in_queue);
1288
1289                if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1290                        goto out_free_dgram;
1291
1292                skb_pull(skb, X25_STD_MIN_LEN);
1293
1294                /*
1295                 *      No Q bit information on Interrupt data.
1296                 */
1297                if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1298                        asmptr  = skb_push(skb, 1);
1299                        *asmptr = 0x00;
1300                }
1301
1302                msg->msg_flags |= MSG_OOB;
1303        } else {
1304                /* Now we can treat all alike */
1305                release_sock(sk);
1306                skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1307                                        flags & MSG_DONTWAIT, &rc);
1308                lock_sock(sk);
1309                if (!skb)
1310                        goto out;
1311
1312                if (!pskb_may_pull(skb, header_len))
1313                        goto out_free_dgram;
1314
1315                qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1316
1317                skb_pull(skb, header_len);
1318
1319                if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1320                        asmptr  = skb_push(skb, 1);
1321                        *asmptr = qbit;
1322                }
1323        }
1324
1325        skb_reset_transport_header(skb);
1326        copied = skb->len;
1327
1328        if (copied > size) {
1329                copied = size;
1330                msg->msg_flags |= MSG_TRUNC;
1331        }
1332
1333        /* Currently, each datagram always contains a complete record */
1334        msg->msg_flags |= MSG_EOR;
1335
1336        rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
1337        if (rc)
1338                goto out_free_dgram;
1339
1340        if (sx25) {
1341                sx25->sx25_family = AF_X25;
1342                sx25->sx25_addr   = x25->dest_addr;
1343                msg->msg_namelen = sizeof(*sx25);
1344        }
1345
1346        x25_check_rbuf(sk);
1347        rc = copied;
1348out_free_dgram:
1349        skb_free_datagram(sk, skb);
1350out:
1351        release_sock(sk);
1352        return rc;
1353}
1354
1355
1356static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1357{
1358        struct sock *sk = sock->sk;
1359        struct x25_sock *x25 = x25_sk(sk);
1360        void __user *argp = (void __user *)arg;
1361        int rc;
1362
1363        switch (cmd) {
1364        case TIOCOUTQ: {
1365                int amount;
1366
1367                amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1368                if (amount < 0)
1369                        amount = 0;
1370                rc = put_user(amount, (unsigned int __user *)argp);
1371                break;
1372        }
1373
1374        case TIOCINQ: {
1375                struct sk_buff *skb;
1376                int amount = 0;
1377                /*
1378                 * These two are safe on a single CPU system as
1379                 * only user tasks fiddle here
1380                 */
1381                lock_sock(sk);
1382                if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1383                        amount = skb->len;
1384                release_sock(sk);
1385                rc = put_user(amount, (unsigned int __user *)argp);
1386                break;
1387        }
1388
1389        case SIOCGSTAMP:
1390                rc = -EINVAL;
1391                if (sk)
1392                        rc = sock_get_timestamp(sk,
1393                                                (struct timeval __user *)argp);
1394                break;
1395        case SIOCGSTAMPNS:
1396                rc = -EINVAL;
1397                if (sk)
1398                        rc = sock_get_timestampns(sk,
1399                                        (struct timespec __user *)argp);
1400                break;
1401        case SIOCGIFADDR:
1402        case SIOCSIFADDR:
1403        case SIOCGIFDSTADDR:
1404        case SIOCSIFDSTADDR:
1405        case SIOCGIFBRDADDR:
1406        case SIOCSIFBRDADDR:
1407        case SIOCGIFNETMASK:
1408        case SIOCSIFNETMASK:
1409        case SIOCGIFMETRIC:
1410        case SIOCSIFMETRIC:
1411                rc = -EINVAL;
1412                break;
1413        case SIOCADDRT:
1414        case SIOCDELRT:
1415                rc = -EPERM;
1416                if (!capable(CAP_NET_ADMIN))
1417                        break;
1418                rc = x25_route_ioctl(cmd, argp);
1419                break;
1420        case SIOCX25GSUBSCRIP:
1421                rc = x25_subscr_ioctl(cmd, argp);
1422                break;
1423        case SIOCX25SSUBSCRIP:
1424                rc = -EPERM;
1425                if (!capable(CAP_NET_ADMIN))
1426                        break;
1427                rc = x25_subscr_ioctl(cmd, argp);
1428                break;
1429        case SIOCX25GFACILITIES: {
1430                lock_sock(sk);
1431                rc = copy_to_user(argp, &x25->facilities,
1432                                  sizeof(x25->facilities))
1433                        ? -EFAULT : 0;
1434                release_sock(sk);
1435                break;
1436        }
1437
1438        case SIOCX25SFACILITIES: {
1439                struct x25_facilities facilities;
1440                rc = -EFAULT;
1441                if (copy_from_user(&facilities, argp, sizeof(facilities)))
1442                        break;
1443                rc = -EINVAL;
1444                lock_sock(sk);
1445                if (sk->sk_state != TCP_LISTEN &&
1446                    sk->sk_state != TCP_CLOSE)
1447                        goto out_fac_release;
1448                if (facilities.pacsize_in < X25_PS16 ||
1449                    facilities.pacsize_in > X25_PS4096)
1450                        goto out_fac_release;
1451                if (facilities.pacsize_out < X25_PS16 ||
1452                    facilities.pacsize_out > X25_PS4096)
1453                        goto out_fac_release;
1454                if (facilities.winsize_in < 1 ||
1455                    facilities.winsize_in > 127)
1456                        goto out_fac_release;
1457                if (facilities.throughput) {
1458                        int out = facilities.throughput & 0xf0;
1459                        int in  = facilities.throughput & 0x0f;
1460                        if (!out)
1461                                facilities.throughput |=
1462                                        X25_DEFAULT_THROUGHPUT << 4;
1463                        else if (out < 0x30 || out > 0xD0)
1464                                goto out_fac_release;
1465                        if (!in)
1466                                facilities.throughput |=
1467                                        X25_DEFAULT_THROUGHPUT;
1468                        else if (in < 0x03 || in > 0x0D)
1469                                goto out_fac_release;
1470                }
1471                if (facilities.reverse &&
1472                    (facilities.reverse & 0x81) != 0x81)
1473                        goto out_fac_release;
1474                x25->facilities = facilities;
1475                rc = 0;
1476out_fac_release:
1477                release_sock(sk);
1478                break;
1479        }
1480
1481        case SIOCX25GDTEFACILITIES: {
1482                lock_sock(sk);
1483                rc = copy_to_user(argp, &x25->dte_facilities,
1484                                  sizeof(x25->dte_facilities));
1485                release_sock(sk);
1486                if (rc)
1487                        rc = -EFAULT;
1488                break;
1489        }
1490
1491        case SIOCX25SDTEFACILITIES: {
1492                struct x25_dte_facilities dtefacs;
1493                rc = -EFAULT;
1494                if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1495                        break;
1496                rc = -EINVAL;
1497                lock_sock(sk);
1498                if (sk->sk_state != TCP_LISTEN &&
1499                    sk->sk_state != TCP_CLOSE)
1500                        goto out_dtefac_release;
1501                if (dtefacs.calling_len > X25_MAX_AE_LEN)
1502                        goto out_dtefac_release;
1503                if (dtefacs.calling_ae == NULL)
1504                        goto out_dtefac_release;
1505                if (dtefacs.called_len > X25_MAX_AE_LEN)
1506                        goto out_dtefac_release;
1507                if (dtefacs.called_ae == NULL)
1508                        goto out_dtefac_release;
1509                x25->dte_facilities = dtefacs;
1510                rc = 0;
1511out_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;
1577out_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;
1604out_sendcallaccpt_release:
1605                release_sock(sk);
1606                break;
1607        }
1608
1609        default:
1610                rc = -ENOIOCTLCMD;
1611                break;
1612        }
1613
1614        return rc;
1615}
1616
1617static 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
1624static 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);
1665out:
1666        return rc;
1667out_dev_put:
1668        dev_put(dev);
1669        goto out;
1670}
1671
1672static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1673                                unsigned long arg)
1674{
1675        void __user *argp = compat_ptr(arg);
1676        struct sock *sk = sock->sk;
1677
1678        int rc = -ENOIOCTLCMD;
1679
1680        switch(cmd) {
1681        case TIOCOUTQ:
1682        case TIOCINQ:
1683                rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1684                break;
1685        case SIOCGSTAMP:
1686                rc = -EINVAL;
1687                if (sk)
1688                        rc = compat_sock_get_timestamp(sk,
1689                                        (struct timeval __user*)argp);
1690                break;
1691        case SIOCGSTAMPNS:
1692                rc = -EINVAL;
1693                if (sk)
1694                        rc = compat_sock_get_timestampns(sk,
1695                                        (struct timespec __user*)argp);
1696                break;
1697        case SIOCGIFADDR:
1698        case SIOCSIFADDR:
1699        case SIOCGIFDSTADDR:
1700        case SIOCSIFDSTADDR:
1701        case SIOCGIFBRDADDR:
1702        case SIOCSIFBRDADDR:
1703        case SIOCGIFNETMASK:
1704        case SIOCSIFNETMASK:
1705        case SIOCGIFMETRIC:
1706        case SIOCSIFMETRIC:
1707                rc = -EINVAL;
1708                break;
1709        case SIOCADDRT:
1710        case SIOCDELRT:
1711                rc = -EPERM;
1712                if (!capable(CAP_NET_ADMIN))
1713                        break;
1714                rc = x25_route_ioctl(cmd, argp);
1715                break;
1716        case SIOCX25GSUBSCRIP:
1717                rc = compat_x25_subscr_ioctl(cmd, argp);
1718                break;
1719        case SIOCX25SSUBSCRIP:
1720                rc = -EPERM;
1721                if (!capable(CAP_NET_ADMIN))
1722                        break;
1723                rc = compat_x25_subscr_ioctl(cmd, argp);
1724                break;
1725        case SIOCX25GFACILITIES:
1726        case SIOCX25SFACILITIES:
1727        case SIOCX25GDTEFACILITIES:
1728        case SIOCX25SDTEFACILITIES:
1729        case SIOCX25GCALLUSERDATA:
1730        case SIOCX25SCALLUSERDATA:
1731        case SIOCX25GCAUSEDIAG:
1732        case SIOCX25SCAUSEDIAG:
1733        case SIOCX25SCUDMATCHLEN:
1734        case SIOCX25CALLACCPTAPPRV:
1735        case SIOCX25SENDCALLACCPT:
1736                rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1737                break;
1738        default:
1739                rc = -ENOIOCTLCMD;
1740                break;
1741        }
1742        return rc;
1743}
1744#endif
1745
1746static const struct proto_ops x25_proto_ops = {
1747        .family =       AF_X25,
1748        .owner =        THIS_MODULE,
1749        .release =      x25_release,
1750        .bind =         x25_bind,
1751        .connect =      x25_connect,
1752        .socketpair =   sock_no_socketpair,
1753        .accept =       x25_accept,
1754        .getname =      x25_getname,
1755        .poll =         datagram_poll,
1756        .ioctl =        x25_ioctl,
1757#ifdef CONFIG_COMPAT
1758        .compat_ioctl = compat_x25_ioctl,
1759#endif
1760        .listen =       x25_listen,
1761        .shutdown =     sock_no_shutdown,
1762        .setsockopt =   x25_setsockopt,
1763        .getsockopt =   x25_getsockopt,
1764        .sendmsg =      x25_sendmsg,
1765        .recvmsg =      x25_recvmsg,
1766        .mmap =         sock_no_mmap,
1767        .sendpage =     sock_no_sendpage,
1768};
1769
1770static struct packet_type x25_packet_type __read_mostly = {
1771        .type = cpu_to_be16(ETH_P_X25),
1772        .func = x25_lapb_receive_frame,
1773};
1774
1775static struct notifier_block x25_dev_notifier = {
1776        .notifier_call = x25_device_event,
1777};
1778
1779void x25_kill_by_neigh(struct x25_neigh *nb)
1780{
1781        struct sock *s;
1782
1783        write_lock_bh(&x25_list_lock);
1784
1785        sk_for_each(s, &x25_list)
1786                if (x25_sk(s)->neighbour == nb)
1787                        x25_disconnect(s, ENETUNREACH, 0, 0);
1788
1789        write_unlock_bh(&x25_list_lock);
1790
1791        /* Remove any related forwards */
1792        x25_clear_forward_by_dev(nb->dev);
1793}
1794
1795static int __init x25_init(void)
1796{
1797        int rc = proto_register(&x25_proto, 0);
1798
1799        if (rc != 0)
1800                goto out;
1801
1802        rc = sock_register(&x25_family_ops);
1803        if (rc != 0)
1804                goto out_proto;
1805
1806        dev_add_pack(&x25_packet_type);
1807
1808        rc = register_netdevice_notifier(&x25_dev_notifier);
1809        if (rc != 0)
1810                goto out_sock;
1811
1812        printk(KERN_INFO "X.25 for Linux Version 0.2\n");
1813
1814        x25_register_sysctl();
1815        rc = x25_proc_init();
1816        if (rc != 0)
1817                goto out_dev;
1818out:
1819        return rc;
1820out_dev:
1821        unregister_netdevice_notifier(&x25_dev_notifier);
1822out_sock:
1823        sock_unregister(AF_X25);
1824out_proto:
1825        proto_unregister(&x25_proto);
1826        goto out;
1827}
1828module_init(x25_init);
1829
1830static 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}
1845module_exit(x25_exit);
1846
1847MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1848MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1849MODULE_LICENSE("GPL");
1850MODULE_ALIAS_NETPROTO(PF_X25);
1851