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#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.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 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(unsigned long data)
 378{
 379        x25_destroy_socket_from_timer((struct sock *)data);
 380}
 381
 382/*
 383 *      This is called from user mode and the timers. Thus it protects itself
 384 *      against interrupt users but doesn't worry about being called during
 385 *      work. Once it is removed from the queue no interrupt or bottom half
 386 *      will touch it and we are (fairly 8-) ) safe.
 387 *      Not static as it's used by the timer
 388 */
 389static void __x25_destroy_socket(struct sock *sk)
 390{
 391        struct sk_buff *skb;
 392
 393        x25_stop_heartbeat(sk);
 394        x25_stop_timer(sk);
 395
 396        x25_remove_socket(sk);
 397        x25_clear_queues(sk);           /* Flush the queues */
 398
 399        while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 400                if (skb->sk != sk) {            /* A pending connection */
 401                        /*
 402                         * Queue the unaccepted socket for death
 403                         */
 404                        skb->sk->sk_state = TCP_LISTEN;
 405                        sock_set_flag(skb->sk, SOCK_DEAD);
 406                        x25_start_heartbeat(skb->sk);
 407                        x25_sk(skb->sk)->state = X25_STATE_0;
 408                }
 409
 410                kfree_skb(skb);
 411        }
 412
 413        if (sk_has_allocations(sk)) {
 414                /* Defer: outstanding buffers */
 415                sk->sk_timer.expires  = jiffies + 10 * HZ;
 416                sk->sk_timer.function = x25_destroy_timer;
 417                sk->sk_timer.data = (unsigned long)sk;
 418                add_timer(&sk->sk_timer);
 419        } else {
 420                /* drop last reference so sock_put will free */
 421                __sock_put(sk);
 422        }
 423}
 424
 425void x25_destroy_socket_from_timer(struct sock *sk)
 426{
 427        sock_hold(sk);
 428        bh_lock_sock(sk);
 429        __x25_destroy_socket(sk);
 430        bh_unlock_sock(sk);
 431        sock_put(sk);
 432}
 433
 434/*
 435 *      Handling for system calls applied via the various interfaces to a
 436 *      X.25 socket object.
 437 */
 438
 439static int x25_setsockopt(struct socket *sock, int level, int optname,
 440                          char __user *optval, unsigned int optlen)
 441{
 442        int opt;
 443        struct sock *sk = sock->sk;
 444        int rc = -ENOPROTOOPT;
 445
 446        if (level != SOL_X25 || optname != X25_QBITINCL)
 447                goto out;
 448
 449        rc = -EINVAL;
 450        if (optlen < sizeof(int))
 451                goto out;
 452
 453        rc = -EFAULT;
 454        if (get_user(opt, (int __user *)optval))
 455                goto out;
 456
 457        if (opt)
 458                set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 459        else
 460                clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 461        rc = 0;
 462out:
 463        return rc;
 464}
 465
 466static int x25_getsockopt(struct socket *sock, int level, int optname,
 467                          char __user *optval, int __user *optlen)
 468{
 469        struct sock *sk = sock->sk;
 470        int val, len, rc = -ENOPROTOOPT;
 471
 472        if (level != SOL_X25 || optname != X25_QBITINCL)
 473                goto out;
 474
 475        rc = -EFAULT;
 476        if (get_user(len, optlen))
 477                goto out;
 478
 479        len = min_t(unsigned int, len, sizeof(int));
 480
 481        rc = -EINVAL;
 482        if (len < 0)
 483                goto out;
 484
 485        rc = -EFAULT;
 486        if (put_user(len, optlen))
 487                goto out;
 488
 489        val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 490        rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 491out:
 492        return rc;
 493}
 494
 495static int x25_listen(struct socket *sock, int backlog)
 496{
 497        struct sock *sk = sock->sk;
 498        int rc = -EOPNOTSUPP;
 499
 500        lock_sock(sk);
 501        if (sk->sk_state != TCP_LISTEN) {
 502                memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 503                sk->sk_max_ack_backlog = backlog;
 504                sk->sk_state           = TCP_LISTEN;
 505                rc = 0;
 506        }
 507        release_sock(sk);
 508
 509        return rc;
 510}
 511
 512static struct proto x25_proto = {
 513        .name     = "X25",
 514        .owner    = THIS_MODULE,
 515        .obj_size = sizeof(struct x25_sock),
 516};
 517
 518static struct sock *x25_alloc_socket(struct net *net, int kern)
 519{
 520        struct x25_sock *x25;
 521        struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 522
 523        if (!sk)
 524                goto out;
 525
 526        sock_init_data(NULL, sk);
 527
 528        x25 = x25_sk(sk);
 529        skb_queue_head_init(&x25->ack_queue);
 530        skb_queue_head_init(&x25->fragment_queue);
 531        skb_queue_head_init(&x25->interrupt_in_queue);
 532        skb_queue_head_init(&x25->interrupt_out_queue);
 533out:
 534        return sk;
 535}
 536
 537static int x25_create(struct net *net, struct socket *sock, int protocol,
 538                      int kern)
 539{
 540        struct sock *sk;
 541        struct x25_sock *x25;
 542        int rc = -EAFNOSUPPORT;
 543
 544        if (!net_eq(net, &init_net))
 545                goto out;
 546
 547        rc = -ESOCKTNOSUPPORT;
 548        if (sock->type != SOCK_SEQPACKET)
 549                goto out;
 550
 551        rc = -EINVAL;
 552        if (protocol)
 553                goto out;
 554
 555        rc = -ENOBUFS;
 556        if ((sk = x25_alloc_socket(net, kern)) == NULL)
 557                goto out;
 558
 559        x25 = x25_sk(sk);
 560
 561        sock_init_data(sock, sk);
 562
 563        x25_init_timers(sk);
 564
 565        sock->ops    = &x25_proto_ops;
 566        sk->sk_protocol = protocol;
 567        sk->sk_backlog_rcv = x25_backlog_rcv;
 568
 569        x25->t21   = sysctl_x25_call_request_timeout;
 570        x25->t22   = sysctl_x25_reset_request_timeout;
 571        x25->t23   = sysctl_x25_clear_request_timeout;
 572        x25->t2    = sysctl_x25_ack_holdback_timeout;
 573        x25->state = X25_STATE_0;
 574        x25->cudmatchlength = 0;
 575        set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 576                                                        /* on call accept   */
 577
 578        x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 579        x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 580        x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 581        x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 582        x25->facilities.throughput  = 0;        /* by default don't negotiate
 583                                                   throughput */
 584        x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 585        x25->dte_facilities.calling_len = 0;
 586        x25->dte_facilities.called_len = 0;
 587        memset(x25->dte_facilities.called_ae, '\0',
 588                        sizeof(x25->dte_facilities.called_ae));
 589        memset(x25->dte_facilities.calling_ae, '\0',
 590                        sizeof(x25->dte_facilities.calling_ae));
 591
 592        rc = 0;
 593out:
 594        return rc;
 595}
 596
 597static struct sock *x25_make_new(struct sock *osk)
 598{
 599        struct sock *sk = NULL;
 600        struct x25_sock *x25, *ox25;
 601
 602        if (osk->sk_type != SOCK_SEQPACKET)
 603                goto out;
 604
 605        if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
 606                goto out;
 607
 608        x25 = x25_sk(sk);
 609
 610        sk->sk_type        = osk->sk_type;
 611        sk->sk_priority    = osk->sk_priority;
 612        sk->sk_protocol    = osk->sk_protocol;
 613        sk->sk_rcvbuf      = osk->sk_rcvbuf;
 614        sk->sk_sndbuf      = osk->sk_sndbuf;
 615        sk->sk_state       = TCP_ESTABLISHED;
 616        sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 617        sock_copy_flags(sk, osk);
 618
 619        ox25 = x25_sk(osk);
 620        x25->t21        = ox25->t21;
 621        x25->t22        = ox25->t22;
 622        x25->t23        = ox25->t23;
 623        x25->t2         = ox25->t2;
 624        x25->flags      = ox25->flags;
 625        x25->facilities = ox25->facilities;
 626        x25->dte_facilities = ox25->dte_facilities;
 627        x25->cudmatchlength = ox25->cudmatchlength;
 628
 629        clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 630        x25_init_timers(sk);
 631out:
 632        return sk;
 633}
 634
 635static int x25_release(struct socket *sock)
 636{
 637        struct sock *sk = sock->sk;
 638        struct x25_sock *x25;
 639
 640        if (!sk)
 641                return 0;
 642
 643        x25 = x25_sk(sk);
 644
 645        sock_hold(sk);
 646        lock_sock(sk);
 647        switch (x25->state) {
 648
 649                case X25_STATE_0:
 650                case X25_STATE_2:
 651                        x25_disconnect(sk, 0, 0, 0);
 652                        __x25_destroy_socket(sk);
 653                        goto out;
 654
 655                case X25_STATE_1:
 656                case X25_STATE_3:
 657                case X25_STATE_4:
 658                        x25_clear_queues(sk);
 659                        x25_write_internal(sk, X25_CLEAR_REQUEST);
 660                        x25_start_t23timer(sk);
 661                        x25->state = X25_STATE_2;
 662                        sk->sk_state    = TCP_CLOSE;
 663                        sk->sk_shutdown |= SEND_SHUTDOWN;
 664                        sk->sk_state_change(sk);
 665                        sock_set_flag(sk, SOCK_DEAD);
 666                        sock_set_flag(sk, SOCK_DESTROY);
 667                        break;
 668        }
 669
 670        sock_orphan(sk);
 671out:
 672        release_sock(sk);
 673        sock_put(sk);
 674        return 0;
 675}
 676
 677static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 678{
 679        struct sock *sk = sock->sk;
 680        struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 681        int len, i, rc = 0;
 682
 683        if (!sock_flag(sk, SOCK_ZAPPED) ||
 684            addr_len != sizeof(struct sockaddr_x25) ||
 685            addr->sx25_family != AF_X25) {
 686                rc = -EINVAL;
 687                goto out;
 688        }
 689
 690        len = strlen(addr->sx25_addr.x25_addr);
 691        for (i = 0; i < len; i++) {
 692                if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 693                        rc = -EINVAL;
 694                        goto out;
 695                }
 696        }
 697
 698        lock_sock(sk);
 699        x25_sk(sk)->source_addr = addr->sx25_addr;
 700        x25_insert_socket(sk);
 701        sock_reset_flag(sk, SOCK_ZAPPED);
 702        release_sock(sk);
 703        SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 704out:
 705        return rc;
 706}
 707
 708static int x25_wait_for_connection_establishment(struct sock *sk)
 709{
 710        DECLARE_WAITQUEUE(wait, current);
 711        int rc;
 712
 713        add_wait_queue_exclusive(sk_sleep(sk), &wait);
 714        for (;;) {
 715                __set_current_state(TASK_INTERRUPTIBLE);
 716                rc = -ERESTARTSYS;
 717                if (signal_pending(current))
 718                        break;
 719                rc = sock_error(sk);
 720                if (rc) {
 721                        sk->sk_socket->state = SS_UNCONNECTED;
 722                        break;
 723                }
 724                rc = 0;
 725                if (sk->sk_state != TCP_ESTABLISHED) {
 726                        release_sock(sk);
 727                        schedule();
 728                        lock_sock(sk);
 729                } else
 730                        break;
 731        }
 732        __set_current_state(TASK_RUNNING);
 733        remove_wait_queue(sk_sleep(sk), &wait);
 734        return rc;
 735}
 736
 737static int x25_connect(struct socket *sock, struct sockaddr *uaddr,
 738                       int addr_len, int flags)
 739{
 740        struct sock *sk = sock->sk;
 741        struct x25_sock *x25 = x25_sk(sk);
 742        struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 743        struct x25_route *rt;
 744        int rc = 0;
 745
 746        lock_sock(sk);
 747        if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 748                sock->state = SS_CONNECTED;
 749                goto out; /* Connect completed during a ERESTARTSYS event */
 750        }
 751
 752        rc = -ECONNREFUSED;
 753        if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 754                sock->state = SS_UNCONNECTED;
 755                goto out;
 756        }
 757
 758        rc = -EISCONN;  /* No reconnect on a seqpacket socket */
 759        if (sk->sk_state == TCP_ESTABLISHED)
 760                goto out;
 761
 762        sk->sk_state   = TCP_CLOSE;
 763        sock->state = SS_UNCONNECTED;
 764
 765        rc = -EINVAL;
 766        if (addr_len != sizeof(struct sockaddr_x25) ||
 767            addr->sx25_family != AF_X25)
 768                goto out;
 769
 770        rc = -ENETUNREACH;
 771        rt = x25_get_route(&addr->sx25_addr);
 772        if (!rt)
 773                goto out;
 774
 775        x25->neighbour = x25_get_neigh(rt->dev);
 776        if (!x25->neighbour)
 777                goto out_put_route;
 778
 779        x25_limit_facilities(&x25->facilities, x25->neighbour);
 780
 781        x25->lci = x25_new_lci(x25->neighbour);
 782        if (!x25->lci)
 783                goto out_put_neigh;
 784
 785        rc = -EINVAL;
 786        if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 787                goto out_put_neigh;
 788
 789        if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 790                memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 791
 792        x25->dest_addr = addr->sx25_addr;
 793
 794        /* Move to connecting socket, start sending Connect Requests */
 795        sock->state   = SS_CONNECTING;
 796        sk->sk_state  = TCP_SYN_SENT;
 797
 798        x25->state = X25_STATE_1;
 799
 800        x25_write_internal(sk, X25_CALL_REQUEST);
 801
 802        x25_start_heartbeat(sk);
 803        x25_start_t21timer(sk);
 804
 805        /* Now the loop */
 806        rc = -EINPROGRESS;
 807        if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 808                goto out_put_neigh;
 809
 810        rc = x25_wait_for_connection_establishment(sk);
 811        if (rc)
 812                goto out_put_neigh;
 813
 814        sock->state = SS_CONNECTED;
 815        rc = 0;
 816out_put_neigh:
 817        if (rc)
 818                x25_neigh_put(x25->neighbour);
 819out_put_route:
 820        x25_route_put(rt);
 821out:
 822        release_sock(sk);
 823        return rc;
 824}
 825
 826static int x25_wait_for_data(struct sock *sk, long timeout)
 827{
 828        DECLARE_WAITQUEUE(wait, current);
 829        int rc = 0;
 830
 831        add_wait_queue_exclusive(sk_sleep(sk), &wait);
 832        for (;;) {
 833                __set_current_state(TASK_INTERRUPTIBLE);
 834                if (sk->sk_shutdown & RCV_SHUTDOWN)
 835                        break;
 836                rc = -ERESTARTSYS;
 837                if (signal_pending(current))
 838                        break;
 839                rc = -EAGAIN;
 840                if (!timeout)
 841                        break;
 842                rc = 0;
 843                if (skb_queue_empty(&sk->sk_receive_queue)) {
 844                        release_sock(sk);
 845                        timeout = schedule_timeout(timeout);
 846                        lock_sock(sk);
 847                } else
 848                        break;
 849        }
 850        __set_current_state(TASK_RUNNING);
 851        remove_wait_queue(sk_sleep(sk), &wait);
 852        return rc;
 853}
 854
 855static int x25_accept(struct socket *sock, struct socket *newsock, int flags)
 856{
 857        struct sock *sk = sock->sk;
 858        struct sock *newsk;
 859        struct sk_buff *skb;
 860        int rc = -EINVAL;
 861
 862        if (!sk)
 863                goto out;
 864
 865        rc = -EOPNOTSUPP;
 866        if (sk->sk_type != SOCK_SEQPACKET)
 867                goto out;
 868
 869        lock_sock(sk);
 870        rc = -EINVAL;
 871        if (sk->sk_state != TCP_LISTEN)
 872                goto out2;
 873
 874        rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 875        if (rc)
 876                goto out2;
 877        skb = skb_dequeue(&sk->sk_receive_queue);
 878        rc = -EINVAL;
 879        if (!skb->sk)
 880                goto out2;
 881        newsk            = skb->sk;
 882        sock_graft(newsk, newsock);
 883
 884        /* Now attach up the new socket */
 885        skb->sk = NULL;
 886        kfree_skb(skb);
 887        sk->sk_ack_backlog--;
 888        newsock->state = SS_CONNECTED;
 889        rc = 0;
 890out2:
 891        release_sock(sk);
 892out:
 893        return rc;
 894}
 895
 896static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 897                       int *uaddr_len, int peer)
 898{
 899        struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 900        struct sock *sk = sock->sk;
 901        struct x25_sock *x25 = x25_sk(sk);
 902        int rc = 0;
 903
 904        if (peer) {
 905                if (sk->sk_state != TCP_ESTABLISHED) {
 906                        rc = -ENOTCONN;
 907                        goto out;
 908                }
 909                sx25->sx25_addr = x25->dest_addr;
 910        } else
 911                sx25->sx25_addr = x25->source_addr;
 912
 913        sx25->sx25_family = AF_X25;
 914        *uaddr_len = sizeof(*sx25);
 915
 916out:
 917        return rc;
 918}
 919
 920int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 921                        unsigned int lci)
 922{
 923        struct sock *sk;
 924        struct sock *make;
 925        struct x25_sock *makex25;
 926        struct x25_address source_addr, dest_addr;
 927        struct x25_facilities facilities;
 928        struct x25_dte_facilities dte_facilities;
 929        int len, addr_len, rc;
 930
 931        /*
 932         *      Remove the LCI and frame type.
 933         */
 934        skb_pull(skb, X25_STD_MIN_LEN);
 935
 936        /*
 937         *      Extract the X.25 addresses and convert them to ASCII strings,
 938         *      and remove them.
 939         *
 940         *      Address block is mandatory in call request packets
 941         */
 942        addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 943        if (addr_len <= 0)
 944                goto out_clear_request;
 945        skb_pull(skb, addr_len);
 946
 947        /*
 948         *      Get the length of the facilities, skip past them for the moment
 949         *      get the call user data because this is needed to determine
 950         *      the correct listener
 951         *
 952         *      Facilities length is mandatory in call request packets
 953         */
 954        if (!pskb_may_pull(skb, 1))
 955                goto out_clear_request;
 956        len = skb->data[0] + 1;
 957        if (!pskb_may_pull(skb, len))
 958                goto out_clear_request;
 959        skb_pull(skb,len);
 960
 961        /*
 962         *      Ensure that the amount of call user data is valid.
 963         */
 964        if (skb->len > X25_MAX_CUD_LEN)
 965                goto out_clear_request;
 966
 967        /*
 968         *      Get all the call user data so it can be used in
 969         *      x25_find_listener and skb_copy_from_linear_data up ahead.
 970         */
 971        if (!pskb_may_pull(skb, skb->len))
 972                goto out_clear_request;
 973
 974        /*
 975         *      Find a listener for the particular address/cud pair.
 976         */
 977        sk = x25_find_listener(&source_addr,skb);
 978        skb_push(skb,len);
 979
 980        if (sk != NULL && sk_acceptq_is_full(sk)) {
 981                goto out_sock_put;
 982        }
 983
 984        /*
 985         *      We dont have any listeners for this incoming call.
 986         *      Try forwarding it.
 987         */
 988        if (sk == NULL) {
 989                skb_push(skb, addr_len + X25_STD_MIN_LEN);
 990                if (sysctl_x25_forward &&
 991                                x25_forward_call(&dest_addr, nb, skb, lci) > 0)
 992                {
 993                        /* Call was forwarded, dont process it any more */
 994                        kfree_skb(skb);
 995                        rc = 1;
 996                        goto out;
 997                } else {
 998                        /* No listeners, can't forward, clear the call */
 999                        goto out_clear_request;
1000                }
1001        }
1002
1003        /*
1004         *      Try to reach a compromise on the requested facilities.
1005         */
1006        len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1007        if (len == -1)
1008                goto out_sock_put;
1009
1010        /*
1011         * current neighbour/link might impose additional limits
1012         * on certain facilties
1013         */
1014
1015        x25_limit_facilities(&facilities, nb);
1016
1017        /*
1018         *      Try to create a new socket.
1019         */
1020        make = x25_make_new(sk);
1021        if (!make)
1022                goto out_sock_put;
1023
1024        /*
1025         *      Remove the facilities
1026         */
1027        skb_pull(skb, len);
1028
1029        skb->sk     = make;
1030        make->sk_state = TCP_ESTABLISHED;
1031
1032        makex25 = x25_sk(make);
1033        makex25->lci           = lci;
1034        makex25->dest_addr     = dest_addr;
1035        makex25->source_addr   = source_addr;
1036        makex25->neighbour     = nb;
1037        makex25->facilities    = facilities;
1038        makex25->dte_facilities= dte_facilities;
1039        makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1040        /* ensure no reverse facil on accept */
1041        makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1042        /* ensure no calling address extension on accept */
1043        makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1044        makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1045
1046        /* Normally all calls are accepted immediately */
1047        if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1048                x25_write_internal(make, X25_CALL_ACCEPTED);
1049                makex25->state = X25_STATE_3;
1050        }
1051
1052        /*
1053         *      Incoming Call User Data.
1054         */
1055        skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1056        makex25->calluserdata.cudlength = skb->len;
1057
1058        sk->sk_ack_backlog++;
1059
1060        x25_insert_socket(make);
1061
1062        skb_queue_head(&sk->sk_receive_queue, skb);
1063
1064        x25_start_heartbeat(make);
1065
1066        if (!sock_flag(sk, SOCK_DEAD))
1067                sk->sk_data_ready(sk);
1068        rc = 1;
1069        sock_put(sk);
1070out:
1071        return rc;
1072out_sock_put:
1073        sock_put(sk);
1074out_clear_request:
1075        rc = 0;
1076        x25_transmit_clear_request(nb, lci, 0x01);
1077        goto out;
1078}
1079
1080static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1081{
1082        struct sock *sk = sock->sk;
1083        struct x25_sock *x25 = x25_sk(sk);
1084        DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1085        struct sockaddr_x25 sx25;
1086        struct sk_buff *skb;
1087        unsigned char *asmptr;
1088        int noblock = msg->msg_flags & MSG_DONTWAIT;
1089        size_t size;
1090        int qbit = 0, rc = -EINVAL;
1091
1092        lock_sock(sk);
1093        if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1094                goto out;
1095
1096        /* we currently don't support segmented records at the user interface */
1097        if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1098                goto out;
1099
1100        rc = -EADDRNOTAVAIL;
1101        if (sock_flag(sk, SOCK_ZAPPED))
1102                goto out;
1103
1104        rc = -EPIPE;
1105        if (sk->sk_shutdown & SEND_SHUTDOWN) {
1106                send_sig(SIGPIPE, current, 0);
1107                goto out;
1108        }
1109
1110        rc = -ENETUNREACH;
1111        if (!x25->neighbour)
1112                goto out;
1113
1114        if (usx25) {
1115                rc = -EINVAL;
1116                if (msg->msg_namelen < sizeof(sx25))
1117                        goto out;
1118                memcpy(&sx25, usx25, sizeof(sx25));
1119                rc = -EISCONN;
1120                if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1121                        goto out;
1122                rc = -EINVAL;
1123                if (sx25.sx25_family != AF_X25)
1124                        goto out;
1125        } else {
1126                /*
1127                 *      FIXME 1003.1g - if the socket is like this because
1128                 *      it has become closed (not started closed) we ought
1129                 *      to SIGPIPE, EPIPE;
1130                 */
1131                rc = -ENOTCONN;
1132                if (sk->sk_state != TCP_ESTABLISHED)
1133                        goto out;
1134
1135                sx25.sx25_family = AF_X25;
1136                sx25.sx25_addr   = x25->dest_addr;
1137        }
1138
1139        /* Sanity check the packet size */
1140        if (len > 65535) {
1141                rc = -EMSGSIZE;
1142                goto out;
1143        }
1144
1145        SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1146
1147        /* Build a packet */
1148        SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1149
1150        if ((msg->msg_flags & MSG_OOB) && len > 32)
1151                len = 32;
1152
1153        size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1154
1155        release_sock(sk);
1156        skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1157        lock_sock(sk);
1158        if (!skb)
1159                goto out;
1160        X25_SKB_CB(skb)->flags = msg->msg_flags;
1161
1162        skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1163
1164        /*
1165         *      Put the data on the end
1166         */
1167        SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1168
1169        skb_reset_transport_header(skb);
1170        skb_put(skb, len);
1171
1172        rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1173        if (rc)
1174                goto out_kfree_skb;
1175
1176        /*
1177         *      If the Q BIT Include socket option is in force, the first
1178         *      byte of the user data is the logical value of the Q Bit.
1179         */
1180        if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1181                if (!pskb_may_pull(skb, 1))
1182                        goto out_kfree_skb;
1183
1184                qbit = skb->data[0];
1185                skb_pull(skb, 1);
1186        }
1187
1188        /*
1189         *      Push down the X.25 header
1190         */
1191        SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1192
1193        if (msg->msg_flags & MSG_OOB) {
1194                if (x25->neighbour->extended) {
1195                        asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1196                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1197                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1198                        *asmptr++ = X25_INTERRUPT;
1199                } else {
1200                        asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1201                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1202                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1203                        *asmptr++ = X25_INTERRUPT;
1204                }
1205        } else {
1206                if (x25->neighbour->extended) {
1207                        /* Build an Extended X.25 header */
1208                        asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1209                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1210                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1211                        *asmptr++ = X25_DATA;
1212                        *asmptr++ = X25_DATA;
1213                } else {
1214                        /* Build an Standard X.25 header */
1215                        asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1216                        *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1217                        *asmptr++ = (x25->lci >> 0) & 0xFF;
1218                        *asmptr++ = X25_DATA;
1219                }
1220
1221                if (qbit)
1222                        skb->data[0] |= X25_Q_BIT;
1223        }
1224
1225        SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1226        SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1227
1228        rc = -ENOTCONN;
1229        if (sk->sk_state != TCP_ESTABLISHED)
1230                goto out_kfree_skb;
1231
1232        if (msg->msg_flags & MSG_OOB)
1233                skb_queue_tail(&x25->interrupt_out_queue, skb);
1234        else {
1235                rc = x25_output(sk, skb);
1236                len = rc;
1237                if (rc < 0)
1238                        kfree_skb(skb);
1239                else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1240                        len++;
1241        }
1242
1243        x25_kick(sk);
1244        rc = len;
1245out:
1246        release_sock(sk);
1247        return rc;
1248out_kfree_skb:
1249        kfree_skb(skb);
1250        goto out;
1251}
1252
1253
1254static int x25_recvmsg(struct socket *sock, 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        DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, 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_msg(skb, 0, msg, 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.called_len > X25_MAX_AE_LEN)
1504                        goto out_dtefac_release;
1505                x25->dte_facilities = dtefacs;
1506                rc = 0;
1507out_dtefac_release:
1508                release_sock(sk);
1509                break;
1510        }
1511
1512        case SIOCX25GCALLUSERDATA: {
1513                lock_sock(sk);
1514                rc = copy_to_user(argp, &x25->calluserdata,
1515                                  sizeof(x25->calluserdata))
1516                        ? -EFAULT : 0;
1517                release_sock(sk);
1518                break;
1519        }
1520
1521        case SIOCX25SCALLUSERDATA: {
1522                struct x25_calluserdata calluserdata;
1523
1524                rc = -EFAULT;
1525                if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1526                        break;
1527                rc = -EINVAL;
1528                if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1529                        break;
1530                lock_sock(sk);
1531                x25->calluserdata = calluserdata;
1532                release_sock(sk);
1533                rc = 0;
1534                break;
1535        }
1536
1537        case SIOCX25GCAUSEDIAG: {
1538                lock_sock(sk);
1539                rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1540                        ? -EFAULT : 0;
1541                release_sock(sk);
1542                break;
1543        }
1544
1545        case SIOCX25SCAUSEDIAG: {
1546                struct x25_causediag causediag;
1547                rc = -EFAULT;
1548                if (copy_from_user(&causediag, argp, sizeof(causediag)))
1549                        break;
1550                lock_sock(sk);
1551                x25->causediag = causediag;
1552                release_sock(sk);
1553                rc = 0;
1554                break;
1555
1556        }
1557
1558        case SIOCX25SCUDMATCHLEN: {
1559                struct x25_subaddr sub_addr;
1560                rc = -EINVAL;
1561                lock_sock(sk);
1562                if(sk->sk_state != TCP_CLOSE)
1563                        goto out_cud_release;
1564                rc = -EFAULT;
1565                if (copy_from_user(&sub_addr, argp,
1566                                   sizeof(sub_addr)))
1567                        goto out_cud_release;
1568                rc = -EINVAL;
1569                if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1570                        goto out_cud_release;
1571                x25->cudmatchlength = sub_addr.cudmatchlength;
1572                rc = 0;
1573out_cud_release:
1574                release_sock(sk);
1575                break;
1576        }
1577
1578        case SIOCX25CALLACCPTAPPRV: {
1579                rc = -EINVAL;
1580                lock_sock(sk);
1581                if (sk->sk_state == TCP_CLOSE) {
1582                        clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1583                        rc = 0;
1584                }
1585                release_sock(sk);
1586                break;
1587        }
1588
1589        case SIOCX25SENDCALLACCPT:  {
1590                rc = -EINVAL;
1591                lock_sock(sk);
1592                if (sk->sk_state != TCP_ESTABLISHED)
1593                        goto out_sendcallaccpt_release;
1594                /* must call accptapprv above */
1595                if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1596                        goto out_sendcallaccpt_release;
1597                x25_write_internal(sk, X25_CALL_ACCEPTED);
1598                x25->state = X25_STATE_3;
1599                rc = 0;
1600out_sendcallaccpt_release:
1601                release_sock(sk);
1602                break;
1603        }
1604
1605        default:
1606                rc = -ENOIOCTLCMD;
1607                break;
1608        }
1609
1610        return rc;
1611}
1612
1613static const struct net_proto_family x25_family_ops = {
1614        .family =       AF_X25,
1615        .create =       x25_create,
1616        .owner  =       THIS_MODULE,
1617};
1618
1619#ifdef CONFIG_COMPAT
1620static int compat_x25_subscr_ioctl(unsigned int cmd,
1621                struct compat_x25_subscrip_struct __user *x25_subscr32)
1622{
1623        struct compat_x25_subscrip_struct x25_subscr;
1624        struct x25_neigh *nb;
1625        struct net_device *dev;
1626        int rc = -EINVAL;
1627
1628        rc = -EFAULT;
1629        if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1630                goto out;
1631
1632        rc = -EINVAL;
1633        dev = x25_dev_get(x25_subscr.device);
1634        if (dev == NULL)
1635                goto out;
1636
1637        nb = x25_get_neigh(dev);
1638        if (nb == NULL)
1639                goto out_dev_put;
1640
1641        dev_put(dev);
1642
1643        if (cmd == SIOCX25GSUBSCRIP) {
1644                read_lock_bh(&x25_neigh_list_lock);
1645                x25_subscr.extended = nb->extended;
1646                x25_subscr.global_facil_mask = nb->global_facil_mask;
1647                read_unlock_bh(&x25_neigh_list_lock);
1648                rc = copy_to_user(x25_subscr32, &x25_subscr,
1649                                sizeof(*x25_subscr32)) ? -EFAULT : 0;
1650        } else {
1651                rc = -EINVAL;
1652                if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1653                        rc = 0;
1654                        write_lock_bh(&x25_neigh_list_lock);
1655                        nb->extended = x25_subscr.extended;
1656                        nb->global_facil_mask = x25_subscr.global_facil_mask;
1657                        write_unlock_bh(&x25_neigh_list_lock);
1658                }
1659        }
1660        x25_neigh_put(nb);
1661out:
1662        return rc;
1663out_dev_put:
1664        dev_put(dev);
1665        goto out;
1666}
1667
1668static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1669                                unsigned long arg)
1670{
1671        void __user *argp = compat_ptr(arg);
1672        struct sock *sk = sock->sk;
1673
1674        int rc = -ENOIOCTLCMD;
1675
1676        switch(cmd) {
1677        case TIOCOUTQ:
1678        case TIOCINQ:
1679                rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1680                break;
1681        case SIOCGSTAMP:
1682                rc = -EINVAL;
1683                if (sk)
1684                        rc = compat_sock_get_timestamp(sk,
1685                                        (struct timeval __user*)argp);
1686                break;
1687        case SIOCGSTAMPNS:
1688                rc = -EINVAL;
1689                if (sk)
1690                        rc = compat_sock_get_timestampns(sk,
1691                                        (struct timespec __user*)argp);
1692                break;
1693        case SIOCGIFADDR:
1694        case SIOCSIFADDR:
1695        case SIOCGIFDSTADDR:
1696        case SIOCSIFDSTADDR:
1697        case SIOCGIFBRDADDR:
1698        case SIOCSIFBRDADDR:
1699        case SIOCGIFNETMASK:
1700        case SIOCSIFNETMASK:
1701        case SIOCGIFMETRIC:
1702        case SIOCSIFMETRIC:
1703                rc = -EINVAL;
1704                break;
1705        case SIOCADDRT:
1706        case SIOCDELRT:
1707                rc = -EPERM;
1708                if (!capable(CAP_NET_ADMIN))
1709                        break;
1710                rc = x25_route_ioctl(cmd, argp);
1711                break;
1712        case SIOCX25GSUBSCRIP:
1713                rc = compat_x25_subscr_ioctl(cmd, argp);
1714                break;
1715        case SIOCX25SSUBSCRIP:
1716                rc = -EPERM;
1717                if (!capable(CAP_NET_ADMIN))
1718                        break;
1719                rc = compat_x25_subscr_ioctl(cmd, argp);
1720                break;
1721        case SIOCX25GFACILITIES:
1722        case SIOCX25SFACILITIES:
1723        case SIOCX25GDTEFACILITIES:
1724        case SIOCX25SDTEFACILITIES:
1725        case SIOCX25GCALLUSERDATA:
1726        case SIOCX25SCALLUSERDATA:
1727        case SIOCX25GCAUSEDIAG:
1728        case SIOCX25SCAUSEDIAG:
1729        case SIOCX25SCUDMATCHLEN:
1730        case SIOCX25CALLACCPTAPPRV:
1731        case SIOCX25SENDCALLACCPT:
1732                rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1733                break;
1734        default:
1735                rc = -ENOIOCTLCMD;
1736                break;
1737        }
1738        return rc;
1739}
1740#endif
1741
1742static const struct proto_ops x25_proto_ops = {
1743        .family =       AF_X25,
1744        .owner =        THIS_MODULE,
1745        .release =      x25_release,
1746        .bind =         x25_bind,
1747        .connect =      x25_connect,
1748        .socketpair =   sock_no_socketpair,
1749        .accept =       x25_accept,
1750        .getname =      x25_getname,
1751        .poll =         datagram_poll,
1752        .ioctl =        x25_ioctl,
1753#ifdef CONFIG_COMPAT
1754        .compat_ioctl = compat_x25_ioctl,
1755#endif
1756        .listen =       x25_listen,
1757        .shutdown =     sock_no_shutdown,
1758        .setsockopt =   x25_setsockopt,
1759        .getsockopt =   x25_getsockopt,
1760        .sendmsg =      x25_sendmsg,
1761        .recvmsg =      x25_recvmsg,
1762        .mmap =         sock_no_mmap,
1763        .sendpage =     sock_no_sendpage,
1764};
1765
1766static struct packet_type x25_packet_type __read_mostly = {
1767        .type = cpu_to_be16(ETH_P_X25),
1768        .func = x25_lapb_receive_frame,
1769};
1770
1771static struct notifier_block x25_dev_notifier = {
1772        .notifier_call = x25_device_event,
1773};
1774
1775void x25_kill_by_neigh(struct x25_neigh *nb)
1776{
1777        struct sock *s;
1778
1779        write_lock_bh(&x25_list_lock);
1780
1781        sk_for_each(s, &x25_list)
1782                if (x25_sk(s)->neighbour == nb)
1783                        x25_disconnect(s, ENETUNREACH, 0, 0);
1784
1785        write_unlock_bh(&x25_list_lock);
1786
1787        /* Remove any related forwards */
1788        x25_clear_forward_by_dev(nb->dev);
1789}
1790
1791static int __init x25_init(void)
1792{
1793        int rc = proto_register(&x25_proto, 0);
1794
1795        if (rc != 0)
1796                goto out;
1797
1798        rc = sock_register(&x25_family_ops);
1799        if (rc != 0)
1800                goto out_proto;
1801
1802        dev_add_pack(&x25_packet_type);
1803
1804        rc = register_netdevice_notifier(&x25_dev_notifier);
1805        if (rc != 0)
1806                goto out_sock;
1807
1808        pr_info("Linux Version 0.2\n");
1809
1810        x25_register_sysctl();
1811        rc = x25_proc_init();
1812        if (rc != 0)
1813                goto out_dev;
1814out:
1815        return rc;
1816out_dev:
1817        unregister_netdevice_notifier(&x25_dev_notifier);
1818out_sock:
1819        sock_unregister(AF_X25);
1820out_proto:
1821        proto_unregister(&x25_proto);
1822        goto out;
1823}
1824module_init(x25_init);
1825
1826static void __exit x25_exit(void)
1827{
1828        x25_proc_exit();
1829        x25_link_free();
1830        x25_route_free();
1831
1832        x25_unregister_sysctl();
1833
1834        unregister_netdevice_notifier(&x25_dev_notifier);
1835
1836        dev_remove_pack(&x25_packet_type);
1837
1838        sock_unregister(AF_X25);
1839        proto_unregister(&x25_proto);
1840}
1841module_exit(x25_exit);
1842
1843MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1844MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1845MODULE_LICENSE("GPL");
1846MODULE_ALIAS_NETPROTO(PF_X25);
1847