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#define pr_fmt(fmt) "X25: " fmt
  39
  40#include <linux/module.h>
  41#include <linux/capability.h>
  42#include <linux/errno.h>
  43#include <linux/kernel.h>
  44#include <linux/sched/signal.h>
  45#include <linux/timer.h>
  46#include <linux/string.h>
  47#include <linux/net.h>
  48#include <linux/netdevice.h>
  49#include <linux/if_arp.h>
  50#include <linux/skbuff.h>
  51#include <linux/slab.h>
  52#include <net/sock.h>
  53#include <net/tcp_states.h>
  54#include <linux/uaccess.h>
  55#include <linux/fcntl.h>
  56#include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  57#include <linux/notifier.h>
  58#include <linux/init.h>
  59#include <linux/compat.h>
  60#include <linux/ctype.h>
  61
  62#include <net/x25.h>
  63#include <net/compat.h>
  64
  65int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  66int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  67int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  68int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  69int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  70int sysctl_x25_forward                 = 0;
  71
  72HLIST_HEAD(x25_list);
  73DEFINE_RWLOCK(x25_list_lock);
  74
  75static const struct proto_ops x25_proto_ops;
  76
  77static const struct x25_address null_x25_address = {"               "};
  78
  79#ifdef CONFIG_COMPAT
  80struct compat_x25_subscrip_struct {
  81        char device[200-sizeof(compat_ulong_t)];
  82        compat_ulong_t global_facil_mask;
  83        compat_uint_t extended;
  84};
  85#endif
  86
  87
  88int x25_parse_address_block(struct sk_buff *skb,
  89                struct x25_address *called_addr,
  90                struct x25_address *calling_addr)
  91{
  92        unsigned char len;
  93        int needed;
  94        int rc;
  95
  96        if (!pskb_may_pull(skb, 1)) {
  97                /* packet has no address block */
  98                rc = 0;
  99                goto empty;
 100        }
 101
 102        len = *skb->data;
 103        needed = 1 + (len >> 4) + (len & 0x0f);
 104
 105        if (!pskb_may_pull(skb, needed)) {
 106                /* packet is too short to hold the addresses it claims
 107                   to hold */
 108                rc = -1;
 109                goto empty;
 110        }
 111
 112        return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 113
 114empty:
 115        *called_addr->x25_addr = 0;
 116        *calling_addr->x25_addr = 0;
 117
 118        return rc;
 119}
 120
 121
 122int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 123                  struct x25_address *calling_addr)
 124{
 125        unsigned int called_len, calling_len;
 126        char *called, *calling;
 127        unsigned int i;
 128
 129        called_len  = (*p >> 0) & 0x0F;
 130        calling_len = (*p >> 4) & 0x0F;
 131
 132        called  = called_addr->x25_addr;
 133        calling = calling_addr->x25_addr;
 134        p++;
 135
 136        for (i = 0; i < (called_len + calling_len); i++) {
 137                if (i < called_len) {
 138                        if (i % 2 != 0) {
 139                                *called++ = ((*p >> 0) & 0x0F) + '0';
 140                                p++;
 141                        } else {
 142                                *called++ = ((*p >> 4) & 0x0F) + '0';
 143                        }
 144                } else {
 145                        if (i % 2 != 0) {
 146                                *calling++ = ((*p >> 0) & 0x0F) + '0';
 147                                p++;
 148                        } else {
 149                                *calling++ = ((*p >> 4) & 0x0F) + '0';
 150                        }
 151                }
 152        }
 153
 154        *called = *calling = '\0';
 155
 156        return 1 + (called_len + calling_len + 1) / 2;
 157}
 158
 159int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 160                  struct x25_address *calling_addr)
 161{
 162        unsigned int called_len, calling_len;
 163        char *called, *calling;
 164        int i;
 165
 166        called  = called_addr->x25_addr;
 167        calling = calling_addr->x25_addr;
 168
 169        called_len  = strlen(called);
 170        calling_len = strlen(calling);
 171
 172        *p++ = (calling_len << 4) | (called_len << 0);
 173
 174        for (i = 0; i < (called_len + calling_len); i++) {
 175                if (i < called_len) {
 176                        if (i % 2 != 0) {
 177                                *p |= (*called++ - '0') << 0;
 178                                p++;
 179                        } else {
 180                                *p = 0x00;
 181                                *p |= (*called++ - '0') << 4;
 182                        }
 183                } else {
 184                        if (i % 2 != 0) {
 185                                *p |= (*calling++ - '0') << 0;
 186                                p++;
 187                        } else {
 188                                *p = 0x00;
 189                                *p |= (*calling++ - '0') << 4;
 190                        }
 191                }
 192        }
 193
 194        return 1 + (called_len + calling_len + 1) / 2;
 195}
 196
 197/*
 198 *      Socket removal during an interrupt is now safe.
 199 */
 200static void x25_remove_socket(struct sock *sk)
 201{
 202        write_lock_bh(&x25_list_lock);
 203        sk_del_node_init(sk);
 204        write_unlock_bh(&x25_list_lock);
 205}
 206
 207/*
 208 *      Kill all bound sockets on a dropped device.
 209 */
 210static void x25_kill_by_device(struct net_device *dev)
 211{
 212        struct sock *s;
 213
 214        write_lock_bh(&x25_list_lock);
 215
 216        sk_for_each(s, &x25_list)
 217                if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 218                        x25_disconnect(s, ENETUNREACH, 0, 0);
 219
 220        write_unlock_bh(&x25_list_lock);
 221}
 222
 223/*
 224 *      Handle device status changes.
 225 */
 226static int x25_device_event(struct notifier_block *this, unsigned long event,
 227                            void *ptr)
 228{
 229        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 230        struct x25_neigh *nb;
 231
 232        if (!net_eq(dev_net(dev), &init_net))
 233                return NOTIFY_DONE;
 234
 235        if (dev->type == ARPHRD_X25
 236#if IS_ENABLED(CONFIG_LLC)
 237         || dev->type == ARPHRD_ETHER
 238#endif
 239         ) {
 240                switch (event) {
 241                case NETDEV_UP:
 242                        x25_link_device_up(dev);
 243                        break;
 244                case NETDEV_GOING_DOWN:
 245                        nb = x25_get_neigh(dev);
 246                        if (nb) {
 247                                x25_terminate_link(nb);
 248                                x25_neigh_put(nb);
 249                        }
 250                        break;
 251                case NETDEV_DOWN:
 252                        x25_kill_by_device(dev);
 253                        x25_route_device_down(dev);
 254                        x25_link_device_down(dev);
 255                        break;
 256                }
 257        }
 258
 259        return NOTIFY_DONE;
 260}
 261
 262/*
 263 *      Add a socket to the bound sockets list.
 264 */
 265static void x25_insert_socket(struct sock *sk)
 266{
 267        write_lock_bh(&x25_list_lock);
 268        sk_add_node(sk, &x25_list);
 269        write_unlock_bh(&x25_list_lock);
 270}
 271
 272/*
 273 *      Find a socket that wants to accept the Call Request we just
 274 *      received. Check the full list for an address/cud match.
 275 *      If no cuds match return the next_best thing, an address match.
 276 *      Note: if a listening socket has cud set it must only get calls
 277 *      with matching cud.
 278 */
 279static struct sock *x25_find_listener(struct x25_address *addr,
 280                                        struct sk_buff *skb)
 281{
 282        struct sock *s;
 283        struct sock *next_best;
 284
 285        read_lock_bh(&x25_list_lock);
 286        next_best = NULL;
 287
 288        sk_for_each(s, &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
 327        sk_for_each(s, &x25_list)
 328                if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 329                        sock_hold(s);
 330                        goto found;
 331                }
 332        s = NULL;
 333found:
 334        return s;
 335}
 336
 337struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 338{
 339        struct sock *s;
 340
 341        read_lock_bh(&x25_list_lock);
 342        s = __x25_find_socket(lci, nb);
 343        read_unlock_bh(&x25_list_lock);
 344        return s;
 345}
 346
 347/*
 348 *      Find a unique LCI for a given device.
 349 */
 350static unsigned int x25_new_lci(struct x25_neigh *nb)
 351{
 352        unsigned int lci = 1;
 353        struct sock *sk;
 354
 355        read_lock_bh(&x25_list_lock);
 356
 357        while ((sk = __x25_find_socket(lci, nb)) != NULL) {
 358                sock_put(sk);
 359                if (++lci == 4096) {
 360                        lci = 0;
 361                        break;
 362                }
 363        }
 364
 365        read_unlock_bh(&x25_list_lock);
 366        return lci;
 367}
 368
 369/*
 370 *      Deferred destroy.
 371 */
 372static void __x25_destroy_socket(struct sock *);
 373
 374/*
 375 *      handler for deferred kills.
 376 */
 377static void x25_destroy_timer(struct timer_list *t)
 378{
 379        struct sock *sk = from_timer(sk, t, sk_timer);
 380
 381        x25_destroy_socket_from_timer(sk);
 382}
 383
 384/*
 385 *      This is called from user mode and the timers. Thus it protects itself
 386 *      against interrupt users but doesn't worry about being called during
 387 *      work. Once it is removed from the queue no interrupt or bottom half
 388 *      will touch it and we are (fairly 8-) ) safe.
 389 *      Not static as it's used by the timer
 390 */
 391static void __x25_destroy_socket(struct sock *sk)
 392{
 393        struct sk_buff *skb;
 394
 395        x25_stop_heartbeat(sk);
 396        x25_stop_timer(sk);
 397
 398        x25_remove_socket(sk);
 399        x25_clear_queues(sk);           /* Flush the queues */
 400
 401        while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 402                if (skb->sk != sk) {            /* A pending connection */
 403                        /*
 404                         * Queue the unaccepted socket for death
 405                         */
 406                        skb->sk->sk_state = TCP_LISTEN;
 407                        sock_set_flag(skb->sk, SOCK_DEAD);
 408                        x25_start_heartbeat(skb->sk);
 409                        x25_sk(skb->sk)->state = X25_STATE_0;
 410                }
 411
 412                kfree_skb(skb);
 413        }
 414
 415        if (sk_has_allocations(sk)) {
 416                /* Defer: outstanding buffers */
 417                sk->sk_timer.expires  = jiffies + 10 * HZ;
 418                sk->sk_timer.function = x25_destroy_timer;
 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, int kern)
 520{
 521        struct x25_sock *x25;
 522        struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 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, kern)) == 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), 0)) == 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                      bool kern)
 858{
 859        struct sock *sk = sock->sk;
 860        struct sock *newsk;
 861        struct sk_buff *skb;
 862        int rc = -EINVAL;
 863
 864        if (!sk)
 865                goto out;
 866
 867        rc = -EOPNOTSUPP;
 868        if (sk->sk_type != SOCK_SEQPACKET)
 869                goto out;
 870
 871        lock_sock(sk);
 872        rc = -EINVAL;
 873        if (sk->sk_state != TCP_LISTEN)
 874                goto out2;
 875
 876        rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 877        if (rc)
 878                goto out2;
 879        skb = skb_dequeue(&sk->sk_receive_queue);
 880        rc = -EINVAL;
 881        if (!skb->sk)
 882                goto out2;
 883        newsk            = skb->sk;
 884        sock_graft(newsk, newsock);
 885
 886        /* Now attach up the new socket */
 887        skb->sk = NULL;
 888        kfree_skb(skb);
 889        sk_acceptq_removed(sk);
 890        newsock->state = SS_CONNECTED;
 891        rc = 0;
 892out2:
 893        release_sock(sk);
 894out:
 895        return rc;
 896}
 897
 898static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 899                       int peer)
 900{
 901        struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 902        struct sock *sk = sock->sk;
 903        struct x25_sock *x25 = x25_sk(sk);
 904        int rc = 0;
 905
 906        if (peer) {
 907                if (sk->sk_state != TCP_ESTABLISHED) {
 908                        rc = -ENOTCONN;
 909                        goto out;
 910                }
 911                sx25->sx25_addr = x25->dest_addr;
 912        } else
 913                sx25->sx25_addr = x25->source_addr;
 914
 915        sx25->sx25_family = AF_X25;
 916        rc = sizeof(*sx25);
 917
 918out:
 919        return rc;
 920}
 921
 922int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 923                        unsigned int lci)
 924{
 925        struct sock *sk;
 926        struct sock *make;
 927        struct x25_sock *makex25;
 928        struct x25_address source_addr, dest_addr;
 929        struct x25_facilities facilities;
 930        struct x25_dte_facilities dte_facilities;
 931        int len, addr_len, rc;
 932
 933        /*
 934         *      Remove the LCI and frame type.
 935         */
 936        skb_pull(skb, X25_STD_MIN_LEN);
 937
 938        /*
 939         *      Extract the X.25 addresses and convert them to ASCII strings,
 940         *      and remove them.
 941         *
 942         *      Address block is mandatory in call request packets
 943         */
 944        addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 945        if (addr_len <= 0)
 946                goto out_clear_request;
 947        skb_pull(skb, addr_len);
 948
 949        /*
 950         *      Get the length of the facilities, skip past them for the moment
 951         *      get the call user data because this is needed to determine
 952         *      the correct listener
 953         *
 954         *      Facilities length is mandatory in call request packets
 955         */
 956        if (!pskb_may_pull(skb, 1))
 957                goto out_clear_request;
 958        len = skb->data[0] + 1;
 959        if (!pskb_may_pull(skb, len))
 960                goto out_clear_request;
 961        skb_pull(skb,len);
 962
 963        /*
 964         *      Ensure that the amount of call user data is valid.
 965         */
 966        if (skb->len > X25_MAX_CUD_LEN)
 967                goto out_clear_request;
 968
 969        /*
 970         *      Get all the call user data so it can be used in
 971         *      x25_find_listener and skb_copy_from_linear_data up ahead.
 972         */
 973        if (!pskb_may_pull(skb, skb->len))
 974                goto out_clear_request;
 975
 976        /*
 977         *      Find a listener for the particular address/cud pair.
 978         */
 979        sk = x25_find_listener(&source_addr,skb);
 980        skb_push(skb,len);
 981
 982        if (sk != NULL && sk_acceptq_is_full(sk)) {
 983                goto out_sock_put;
 984        }
 985
 986        /*
 987         *      We dont have any listeners for this incoming call.
 988         *      Try forwarding it.
 989         */
 990        if (sk == NULL) {
 991                skb_push(skb, addr_len + X25_STD_MIN_LEN);
 992                if (sysctl_x25_forward &&
 993                                x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 994                {
 995                        /* Call was forwarded, dont process it any more */
 996                        kfree_skb(skb);
 997                        rc = 1;
 998                        goto out;
 999                } else {
1000                        /* No listeners, can't forward, clear the call */
1001                        goto out_clear_request;
1002                }
1003        }
1004
1005        /*
1006         *      Try to reach a compromise on the requested facilities.
1007         */
1008        len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1009        if (len == -1)
1010                goto out_sock_put;
1011
1012        /*
1013         * current neighbour/link might impose additional limits
1014         * on certain facilties
1015         */
1016
1017        x25_limit_facilities(&facilities, nb);
1018
1019        /*
1020         *      Try to create a new socket.
1021         */
1022        make = x25_make_new(sk);
1023        if (!make)
1024                goto out_sock_put;
1025
1026        /*
1027         *      Remove the facilities
1028         */
1029        skb_pull(skb, len);
1030
1031        skb->sk     = make;
1032        make->sk_state = TCP_ESTABLISHED;
1033
1034        makex25 = x25_sk(make);
1035        makex25->lci           = lci;
1036        makex25->dest_addr     = dest_addr;
1037        makex25->source_addr   = source_addr;
1038        makex25->neighbour     = nb;
1039        makex25->facilities    = facilities;
1040        makex25->dte_facilities= dte_facilities;
1041        makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1042        /* ensure no reverse facil on accept */
1043        makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1044        /* ensure no calling address extension on accept */
1045        makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1046        makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1047
1048        /* Normally all calls are accepted immediately */
1049        if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1050                x25_write_internal(make, X25_CALL_ACCEPTED);
1051                makex25->state = X25_STATE_3;
1052        }
1053
1054        /*
1055         *      Incoming Call User Data.
1056         */
1057        skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1058        makex25->calluserdata.cudlength = skb->len;
1059
1060        sk_acceptq_added(sk);
1061
1062        x25_insert_socket(make);
1063
1064        skb_queue_head(&sk->sk_receive_queue, skb);
1065
1066        x25_start_heartbeat(make);
1067
1068        if (!sock_flag(sk, SOCK_DEAD))
1069                sk->sk_data_ready(sk);
1070        rc = 1;
1071        sock_put(sk);
1072out:
1073        return rc;
1074out_sock_put:
1075        sock_put(sk);
1076out_clear_request:
1077        rc = 0;
1078        x25_transmit_clear_request(nb, lci, 0x01);
1079        goto out;
1080}
1081
1082static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1083{
1084        struct sock *sk = sock->sk;
1085        struct x25_sock *x25 = x25_sk(sk);
1086        DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, 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_from_msg(skb_transport_header(skb), msg, 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 socket *sock, struct msghdr *msg, size_t size,
1257                       int flags)
1258{
1259        struct sock *sk = sock->sk;
1260        struct x25_sock *x25 = x25_sk(sk);
1261        DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1262        size_t copied;
1263        int qbit, header_len;
1264        struct sk_buff *skb;
1265        unsigned char *asmptr;
1266        int rc = -ENOTCONN;
1267
1268        lock_sock(sk);
1269
1270        if (x25->neighbour == NULL)
1271                goto out;
1272
1273        header_len = x25->neighbour->extended ?
1274                X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1275
1276        /*
1277         * This works for seqpacket too. The receiver has ordered the queue for
1278         * us! We do one quick check first though
1279         */
1280        if (sk->sk_state != TCP_ESTABLISHED)
1281                goto out;
1282
1283        if (flags & MSG_OOB) {
1284                rc = -EINVAL;
1285                if (sock_flag(sk, SOCK_URGINLINE) ||
1286                    !skb_peek(&x25->interrupt_in_queue))
1287                        goto out;
1288
1289                skb = skb_dequeue(&x25->interrupt_in_queue);
1290
1291                if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1292                        goto out_free_dgram;
1293
1294                skb_pull(skb, X25_STD_MIN_LEN);
1295
1296                /*
1297                 *      No Q bit information on Interrupt data.
1298                 */
1299                if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1300                        asmptr  = skb_push(skb, 1);
1301                        *asmptr = 0x00;
1302                }
1303
1304                msg->msg_flags |= MSG_OOB;
1305        } else {
1306                /* Now we can treat all alike */
1307                release_sock(sk);
1308                skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1309                                        flags & MSG_DONTWAIT, &rc);
1310                lock_sock(sk);
1311                if (!skb)
1312                        goto out;
1313
1314                if (!pskb_may_pull(skb, header_len))
1315                        goto out_free_dgram;
1316
1317                qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1318
1319                skb_pull(skb, header_len);
1320
1321                if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1322                        asmptr  = skb_push(skb, 1);
1323                        *asmptr = qbit;
1324                }
1325        }
1326
1327        skb_reset_transport_header(skb);
1328        copied = skb->len;
1329
1330        if (copied > size) {
1331                copied = size;
1332                msg->msg_flags |= MSG_TRUNC;
1333        }
1334
1335        /* Currently, each datagram always contains a complete record */
1336        msg->msg_flags |= MSG_EOR;
1337
1338        rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1339        if (rc)
1340                goto out_free_dgram;
1341
1342        if (sx25) {
1343                sx25->sx25_family = AF_X25;
1344                sx25->sx25_addr   = x25->dest_addr;
1345                msg->msg_namelen = sizeof(*sx25);
1346        }
1347
1348        x25_check_rbuf(sk);
1349        rc = copied;
1350out_free_dgram:
1351        skb_free_datagram(sk, skb);
1352out:
1353        release_sock(sk);
1354        return rc;
1355}
1356
1357
1358static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1359{
1360        struct sock *sk = sock->sk;
1361        struct x25_sock *x25 = x25_sk(sk);
1362        void __user *argp = (void __user *)arg;
1363        int rc;
1364
1365        switch (cmd) {
1366        case TIOCOUTQ: {
1367                int amount;
1368
1369                amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1370                if (amount < 0)
1371                        amount = 0;
1372                rc = put_user(amount, (unsigned int __user *)argp);
1373                break;
1374        }
1375
1376        case TIOCINQ: {
1377                struct sk_buff *skb;
1378                int amount = 0;
1379                /*
1380                 * These two are safe on a single CPU system as
1381                 * only user tasks fiddle here
1382                 */
1383                lock_sock(sk);
1384                if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1385                        amount = skb->len;
1386                release_sock(sk);
1387                rc = put_user(amount, (unsigned int __user *)argp);
1388                break;
1389        }
1390
1391        case SIOCGSTAMP:
1392                rc = -EINVAL;
1393                if (sk)
1394                        rc = sock_get_timestamp(sk,
1395                                                (struct timeval __user *)argp);
1396                break;
1397        case SIOCGSTAMPNS:
1398                rc = -EINVAL;
1399                if (sk)
1400                        rc = sock_get_timestampns(sk,
1401                                        (struct timespec __user *)argp);
1402                break;
1403        case SIOCGIFADDR:
1404        case SIOCSIFADDR:
1405        case SIOCGIFDSTADDR:
1406        case SIOCSIFDSTADDR:
1407        case SIOCGIFBRDADDR:
1408        case SIOCSIFBRDADDR:
1409        case SIOCGIFNETMASK:
1410        case SIOCSIFNETMASK:
1411        case SIOCGIFMETRIC:
1412        case SIOCSIFMETRIC:
1413                rc = -EINVAL;
1414                break;
1415        case SIOCADDRT:
1416        case SIOCDELRT:
1417                rc = -EPERM;
1418                if (!capable(CAP_NET_ADMIN))
1419                        break;
1420                rc = x25_route_ioctl(cmd, argp);
1421                break;
1422        case SIOCX25GSUBSCRIP:
1423                rc = x25_subscr_ioctl(cmd, argp);
1424                break;
1425        case SIOCX25SSUBSCRIP:
1426                rc = -EPERM;
1427                if (!capable(CAP_NET_ADMIN))
1428                        break;
1429                rc = x25_subscr_ioctl(cmd, argp);
1430                break;
1431        case SIOCX25GFACILITIES: {
1432                lock_sock(sk);
1433                rc = copy_to_user(argp, &x25->facilities,
1434                                  sizeof(x25->facilities))
1435                        ? -EFAULT : 0;
1436                release_sock(sk);
1437                break;
1438        }
1439
1440        case SIOCX25SFACILITIES: {
1441                struct x25_facilities facilities;
1442                rc = -EFAULT;
1443                if (copy_from_user(&facilities, argp, sizeof(facilities)))
1444                        break;
1445                rc = -EINVAL;
1446                lock_sock(sk);
1447                if (sk->sk_state != TCP_LISTEN &&
1448                    sk->sk_state != TCP_CLOSE)
1449                        goto out_fac_release;
1450                if (facilities.pacsize_in < X25_PS16 ||
1451                    facilities.pacsize_in > X25_PS4096)
1452                        goto out_fac_release;
1453                if (facilities.pacsize_out < X25_PS16 ||
1454                    facilities.pacsize_out > X25_PS4096)
1455                        goto out_fac_release;
1456                if (facilities.winsize_in < 1 ||
1457                    facilities.winsize_in > 127)
1458                        goto out_fac_release;
1459                if (facilities.throughput) {
1460                        int out = facilities.throughput & 0xf0;
1461                        int in  = facilities.throughput & 0x0f;
1462                        if (!out)
1463                                facilities.throughput |=
1464                                        X25_DEFAULT_THROUGHPUT << 4;
1465                        else if (out < 0x30 || out > 0xD0)
1466                                goto out_fac_release;
1467                        if (!in)
1468                                facilities.throughput |=
1469                                        X25_DEFAULT_THROUGHPUT;
1470                        else if (in < 0x03 || in > 0x0D)
1471                                goto out_fac_release;
1472                }
1473                if (facilities.reverse &&
1474                    (facilities.reverse & 0x81) != 0x81)
1475                        goto out_fac_release;
1476                x25->facilities = facilities;
1477                rc = 0;
1478out_fac_release:
1479                release_sock(sk);
1480                break;
1481        }
1482
1483        case SIOCX25GDTEFACILITIES: {
1484                lock_sock(sk);
1485                rc = copy_to_user(argp, &x25->dte_facilities,
1486                                  sizeof(x25->dte_facilities));
1487                release_sock(sk);
1488                if (rc)
1489                        rc = -EFAULT;
1490                break;
1491        }
1492
1493        case SIOCX25SDTEFACILITIES: {
1494                struct x25_dte_facilities dtefacs;
1495                rc = -EFAULT;
1496                if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1497                        break;
1498                rc = -EINVAL;
1499                lock_sock(sk);
1500                if (sk->sk_state != TCP_LISTEN &&
1501                    sk->sk_state != TCP_CLOSE)
1502                        goto out_dtefac_release;
1503                if (dtefacs.calling_len > X25_MAX_AE_LEN)
1504                        goto out_dtefac_release;
1505                if (dtefacs.called_len > X25_MAX_AE_LEN)
1506                        goto out_dtefac_release;
1507                x25->dte_facilities = dtefacs;
1508                rc = 0;
1509out_dtefac_release:
1510                release_sock(sk);
1511                break;
1512        }
1513
1514        case SIOCX25GCALLUSERDATA: {
1515                lock_sock(sk);
1516                rc = copy_to_user(argp, &x25->calluserdata,
1517                                  sizeof(x25->calluserdata))
1518                        ? -EFAULT : 0;
1519                release_sock(sk);
1520                break;
1521        }
1522
1523        case SIOCX25SCALLUSERDATA: {
1524                struct x25_calluserdata calluserdata;
1525
1526                rc = -EFAULT;
1527                if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1528                        break;
1529                rc = -EINVAL;
1530                if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1531                        break;
1532                lock_sock(sk);
1533                x25->calluserdata = calluserdata;
1534                release_sock(sk);
1535                rc = 0;
1536                break;
1537        }
1538
1539        case SIOCX25GCAUSEDIAG: {
1540                lock_sock(sk);
1541                rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1542                        ? -EFAULT : 0;
1543                release_sock(sk);
1544                break;
1545        }
1546
1547        case SIOCX25SCAUSEDIAG: {
1548                struct x25_causediag causediag;
1549                rc = -EFAULT;
1550                if (copy_from_user(&causediag, argp, sizeof(causediag)))
1551                        break;
1552                lock_sock(sk);
1553                x25->causediag = causediag;
1554                release_sock(sk);
1555                rc = 0;
1556                break;
1557
1558        }
1559
1560        case SIOCX25SCUDMATCHLEN: {
1561                struct x25_subaddr sub_addr;
1562                rc = -EINVAL;
1563                lock_sock(sk);
1564                if(sk->sk_state != TCP_CLOSE)
1565                        goto out_cud_release;
1566                rc = -EFAULT;
1567                if (copy_from_user(&sub_addr, argp,
1568                                   sizeof(sub_addr)))
1569                        goto out_cud_release;
1570                rc = -EINVAL;
1571                if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1572                        goto out_cud_release;
1573                x25->cudmatchlength = sub_addr.cudmatchlength;
1574                rc = 0;
1575out_cud_release:
1576                release_sock(sk);
1577                break;
1578        }
1579
1580        case SIOCX25CALLACCPTAPPRV: {
1581                rc = -EINVAL;
1582                lock_sock(sk);
1583                if (sk->sk_state == TCP_CLOSE) {
1584                        clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1585                        rc = 0;
1586                }
1587                release_sock(sk);
1588                break;
1589        }
1590
1591        case SIOCX25SENDCALLACCPT:  {
1592                rc = -EINVAL;
1593                lock_sock(sk);
1594                if (sk->sk_state != TCP_ESTABLISHED)
1595                        goto out_sendcallaccpt_release;
1596                /* must call accptapprv above */
1597                if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1598                        goto out_sendcallaccpt_release;
1599                x25_write_internal(sk, X25_CALL_ACCEPTED);
1600                x25->state = X25_STATE_3;
1601                rc = 0;
1602out_sendcallaccpt_release:
1603                release_sock(sk);
1604                break;
1605        }
1606
1607        default:
1608                rc = -ENOIOCTLCMD;
1609                break;
1610        }
1611
1612        return rc;
1613}
1614
1615static const struct net_proto_family x25_family_ops = {
1616        .family =       AF_X25,
1617        .create =       x25_create,
1618        .owner  =       THIS_MODULE,
1619};
1620
1621#ifdef CONFIG_COMPAT
1622static int compat_x25_subscr_ioctl(unsigned int cmd,
1623                struct compat_x25_subscrip_struct __user *x25_subscr32)
1624{
1625        struct compat_x25_subscrip_struct x25_subscr;
1626        struct x25_neigh *nb;
1627        struct net_device *dev;
1628        int rc = -EINVAL;
1629
1630        rc = -EFAULT;
1631        if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1632                goto out;
1633
1634        rc = -EINVAL;
1635        dev = x25_dev_get(x25_subscr.device);
1636        if (dev == NULL)
1637                goto out;
1638
1639        nb = x25_get_neigh(dev);
1640        if (nb == NULL)
1641                goto out_dev_put;
1642
1643        dev_put(dev);
1644
1645        if (cmd == SIOCX25GSUBSCRIP) {
1646                read_lock_bh(&x25_neigh_list_lock);
1647                x25_subscr.extended = nb->extended;
1648                x25_subscr.global_facil_mask = nb->global_facil_mask;
1649                read_unlock_bh(&x25_neigh_list_lock);
1650                rc = copy_to_user(x25_subscr32, &x25_subscr,
1651                                sizeof(*x25_subscr32)) ? -EFAULT : 0;
1652        } else {
1653                rc = -EINVAL;
1654                if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1655                        rc = 0;
1656                        write_lock_bh(&x25_neigh_list_lock);
1657                        nb->extended = x25_subscr.extended;
1658                        nb->global_facil_mask = x25_subscr.global_facil_mask;
1659                        write_unlock_bh(&x25_neigh_list_lock);
1660                }
1661        }
1662        x25_neigh_put(nb);
1663out:
1664        return rc;
1665out_dev_put:
1666        dev_put(dev);
1667        goto out;
1668}
1669
1670static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1671                                unsigned long arg)
1672{
1673        void __user *argp = compat_ptr(arg);
1674        struct sock *sk = sock->sk;
1675
1676        int rc = -ENOIOCTLCMD;
1677
1678        switch(cmd) {
1679        case TIOCOUTQ:
1680        case TIOCINQ:
1681                rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1682                break;
1683        case SIOCGSTAMP:
1684                rc = -EINVAL;
1685                if (sk)
1686                        rc = compat_sock_get_timestamp(sk,
1687                                        (struct timeval __user*)argp);
1688                break;
1689        case SIOCGSTAMPNS:
1690                rc = -EINVAL;
1691                if (sk)
1692                        rc = compat_sock_get_timestampns(sk,
1693                                        (struct timespec __user*)argp);
1694                break;
1695        case SIOCGIFADDR:
1696        case SIOCSIFADDR:
1697        case SIOCGIFDSTADDR:
1698        case SIOCSIFDSTADDR:
1699        case SIOCGIFBRDADDR:
1700        case SIOCSIFBRDADDR:
1701        case SIOCGIFNETMASK:
1702        case SIOCSIFNETMASK:
1703        case SIOCGIFMETRIC:
1704        case SIOCSIFMETRIC:
1705                rc = -EINVAL;
1706                break;
1707        case SIOCADDRT:
1708        case SIOCDELRT:
1709                rc = -EPERM;
1710                if (!capable(CAP_NET_ADMIN))
1711                        break;
1712                rc = x25_route_ioctl(cmd, argp);
1713                break;
1714        case SIOCX25GSUBSCRIP:
1715                rc = compat_x25_subscr_ioctl(cmd, argp);
1716                break;
1717        case SIOCX25SSUBSCRIP:
1718                rc = -EPERM;
1719                if (!capable(CAP_NET_ADMIN))
1720                        break;
1721                rc = compat_x25_subscr_ioctl(cmd, argp);
1722                break;
1723        case SIOCX25GFACILITIES:
1724        case SIOCX25SFACILITIES:
1725        case SIOCX25GDTEFACILITIES:
1726        case SIOCX25SDTEFACILITIES:
1727        case SIOCX25GCALLUSERDATA:
1728        case SIOCX25SCALLUSERDATA:
1729        case SIOCX25GCAUSEDIAG:
1730        case SIOCX25SCAUSEDIAG:
1731        case SIOCX25SCUDMATCHLEN:
1732        case SIOCX25CALLACCPTAPPRV:
1733        case SIOCX25SENDCALLACCPT:
1734                rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1735                break;
1736        default:
1737                rc = -ENOIOCTLCMD;
1738                break;
1739        }
1740        return rc;
1741}
1742#endif
1743
1744static const struct proto_ops x25_proto_ops = {
1745        .family =       AF_X25,
1746        .owner =        THIS_MODULE,
1747        .release =      x25_release,
1748        .bind =         x25_bind,
1749        .connect =      x25_connect,
1750        .socketpair =   sock_no_socketpair,
1751        .accept =       x25_accept,
1752        .getname =      x25_getname,
1753        .poll =         datagram_poll,
1754        .ioctl =        x25_ioctl,
1755#ifdef CONFIG_COMPAT
1756        .compat_ioctl = compat_x25_ioctl,
1757#endif
1758        .listen =       x25_listen,
1759        .shutdown =     sock_no_shutdown,
1760        .setsockopt =   x25_setsockopt,
1761        .getsockopt =   x25_getsockopt,
1762        .sendmsg =      x25_sendmsg,
1763        .recvmsg =      x25_recvmsg,
1764        .mmap =         sock_no_mmap,
1765        .sendpage =     sock_no_sendpage,
1766};
1767
1768static struct packet_type x25_packet_type __read_mostly = {
1769        .type = cpu_to_be16(ETH_P_X25),
1770        .func = x25_lapb_receive_frame,
1771};
1772
1773static struct notifier_block x25_dev_notifier = {
1774        .notifier_call = x25_device_event,
1775};
1776
1777void x25_kill_by_neigh(struct x25_neigh *nb)
1778{
1779        struct sock *s;
1780
1781        write_lock_bh(&x25_list_lock);
1782
1783        sk_for_each(s, &x25_list)
1784                if (x25_sk(s)->neighbour == nb)
1785                        x25_disconnect(s, ENETUNREACH, 0, 0);
1786
1787        write_unlock_bh(&x25_list_lock);
1788
1789        /* Remove any related forwards */
1790        x25_clear_forward_by_dev(nb->dev);
1791}
1792
1793static int __init x25_init(void)
1794{
1795        int rc;
1796
1797        rc = proto_register(&x25_proto, 0);
1798        if (rc)
1799                goto out;
1800
1801        rc = sock_register(&x25_family_ops);
1802        if (rc)
1803                goto out_proto;
1804
1805        dev_add_pack(&x25_packet_type);
1806
1807        rc = register_netdevice_notifier(&x25_dev_notifier);
1808        if (rc)
1809                goto out_sock;
1810
1811        rc = x25_register_sysctl();
1812        if (rc)
1813                goto out_dev;
1814
1815        rc = x25_proc_init();
1816        if (rc)
1817                goto out_sysctl;
1818
1819        pr_info("Linux Version 0.2\n");
1820
1821out:
1822        return rc;
1823out_sysctl:
1824        x25_unregister_sysctl();
1825out_dev:
1826        unregister_netdevice_notifier(&x25_dev_notifier);
1827out_sock:
1828        dev_remove_pack(&x25_packet_type);
1829        sock_unregister(AF_X25);
1830out_proto:
1831        proto_unregister(&x25_proto);
1832        goto out;
1833}
1834module_init(x25_init);
1835
1836static void __exit x25_exit(void)
1837{
1838        x25_proc_exit();
1839        x25_link_free();
1840        x25_route_free();
1841
1842        x25_unregister_sysctl();
1843
1844        unregister_netdevice_notifier(&x25_dev_notifier);
1845
1846        dev_remove_pack(&x25_packet_type);
1847
1848        sock_unregister(AF_X25);
1849        proto_unregister(&x25_proto);
1850}
1851module_exit(x25_exit);
1852
1853MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1854MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1855MODULE_LICENSE("GPL");
1856MODULE_ALIAS_NETPROTO(PF_X25);
1857