net/x25/af

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
x25_parse_address_block
x25_addr_ntoa
x25_addr_aton
x25_remove_socket
x25_kill_by_device
x25_device_event
x25_insert_socket
x25_find_listener
__x25_find_socket
x25_find_socket
x25_new_lci
x25_destroy_timer
__x25_destroy_socket
x25_destroy_socket_from_timer
x25_setsockopt
x25_getsockopt
x25_listen
x25_alloc_socket
x25_create
x25_make_new
x25_release
x25_bind
x25_wait_for_connection_establishment
x25_connect
x25_wait_for_data
x25_accept
x25_getname
x25_rx_call_request
x25_sendmsg
x25_recvmsg
x25_ioctl
compat_x25_subscr_ioctl
compat_x25_ioctl
x25_kill_by_neigh
x25_init
x25_exit
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      X.25 Packet Layer release 002
   4  *
   5  *      This is ALPHA test software. This code may break your machine,
   6  *      randomly fail to work with new releases, misbehave and/or generally
   7  *      screw up. It might even work.
   8  *
   9  *      This code REQUIRES 2.1.15 or higher
  10  *
  11  *      History
  12  *      X.25 001        Jonathan Naylor Started coding.
  13  *      X.25 002        Jonathan Naylor Centralised disconnect handling.
  14  *                                      New timer architecture.
  15  *      2000-03-11      Henner Eisen    MSG_EOR handling more POSIX compliant.
  16  *      2000-03-22      Daniela Squassoni Allowed disabling/enabling of
  17  *                                        facilities negotiation and increased
  18  *                                        the throughput upper limit.
  19  *      2000-08-27      Arnaldo C. Melo s/suser/capable/ + micro cleanups
  20  *      2000-09-04      Henner Eisen    Set sock->state in x25_accept().
  21  *                                      Fixed x25_output() related skb leakage.
  22  *      2000-10-02      Henner Eisen    Made x25_kick() single threaded per socket.
  23  *      2000-10-27      Henner Eisen    MSG_DONTWAIT for fragment allocation.
  24  *      2000-11-14      Henner Eisen    Closing datalink from NETDEV_GOING_DOWN
  25  *      2002-10-06      Arnaldo C. Melo Get rid of cli/sti, move proc stuff to
  26  *                                      x25_proc.c, using seq_file
  27  *      2005-04-02      Shaun Pereira   Selective sub address matching
  28  *                                      with call user data
  29  *      2005-04-15      Shaun Pereira   Fast select with no restriction on
  30  *                                      response
  31  */
  32 
  33 #define pr_fmt(fmt) "X25: " fmt
  34 
  35 #include <linux/module.h>
  36 #include <linux/capability.h>
  37 #include <linux/errno.h>
  38 #include <linux/kernel.h>
  39 #include <linux/sched/signal.h>
  40 #include <linux/timer.h>
  41 #include <linux/string.h>
  42 #include <linux/net.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/if_arp.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/slab.h>
  47 #include <net/sock.h>
  48 #include <net/tcp_states.h>
  49 #include <linux/uaccess.h>
  50 #include <linux/fcntl.h>
  51 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  52 #include <linux/notifier.h>
  53 #include <linux/init.h>
  54 #include <linux/compat.h>
  55 #include <linux/ctype.h>
  56 
  57 #include <net/x25.h>
  58 #include <net/compat.h>
  59 
  60 int sysctl_x25_restart_request_timeout = X25_DEFAULT_T20;
  61 int sysctl_x25_call_request_timeout    = X25_DEFAULT_T21;
  62 int sysctl_x25_reset_request_timeout   = X25_DEFAULT_T22;
  63 int sysctl_x25_clear_request_timeout   = X25_DEFAULT_T23;
  64 int sysctl_x25_ack_holdback_timeout    = X25_DEFAULT_T2;
  65 int sysctl_x25_forward                 = 0;
  66 
  67 HLIST_HEAD(x25_list);
  68 DEFINE_RWLOCK(x25_list_lock);
  69 
  70 static const struct proto_ops x25_proto_ops;
  71 
  72 static const struct x25_address null_x25_address = {"               "};
  73 
  74 #ifdef CONFIG_COMPAT
  75 struct compat_x25_subscrip_struct {
  76         char device[200-sizeof(compat_ulong_t)];
  77         compat_ulong_t global_facil_mask;
  78         compat_uint_t extended;
  79 };
  80 #endif
  81 
  82 
  83 int x25_parse_address_block(struct sk_buff *skb,
  84                 struct x25_address *called_addr,
  85                 struct x25_address *calling_addr)
  86 {
  87         unsigned char len;
  88         int needed;
  89         int rc;
  90 
  91         if (!pskb_may_pull(skb, 1)) {
  92                 /* packet has no address block */
  93                 rc = 0;
  94                 goto empty;
  95         }
  96 
  97         len = *skb->data;
  98         needed = 1 + ((len >> 4) + (len & 0x0f) + 1) / 2;
  99 
 100         if (!pskb_may_pull(skb, needed)) {
 101                 /* packet is too short to hold the addresses it claims
 102                    to hold */
 103                 rc = -1;
 104                 goto empty;
 105         }
 106 
 107         return x25_addr_ntoa(skb->data, called_addr, calling_addr);
 108 
 109 empty:
 110         *called_addr->x25_addr = 0;
 111         *calling_addr->x25_addr = 0;
 112 
 113         return rc;
 114 }
 115 
 116 
 117 int x25_addr_ntoa(unsigned char *p, struct x25_address *called_addr,
 118                   struct x25_address *calling_addr)
 119 {
 120         unsigned int called_len, calling_len;
 121         char *called, *calling;
 122         unsigned int i;
 123 
 124         called_len  = (*p >> 0) & 0x0F;
 125         calling_len = (*p >> 4) & 0x0F;
 126 
 127         called  = called_addr->x25_addr;
 128         calling = calling_addr->x25_addr;
 129         p++;
 130 
 131         for (i = 0; i < (called_len + calling_len); i++) {
 132                 if (i < called_len) {
 133                         if (i % 2 != 0) {
 134                                 *called++ = ((*p >> 0) & 0x0F) + '0';
 135                                 p++;
 136                         } else {
 137                                 *called++ = ((*p >> 4) & 0x0F) + '0';
 138                         }
 139                 } else {
 140                         if (i % 2 != 0) {
 141                                 *calling++ = ((*p >> 0) & 0x0F) + '0';
 142                                 p++;
 143                         } else {
 144                                 *calling++ = ((*p >> 4) & 0x0F) + '0';
 145                         }
 146                 }
 147         }
 148 
 149         *called = *calling = '\0';
 150 
 151         return 1 + (called_len + calling_len + 1) / 2;
 152 }
 153 
 154 int x25_addr_aton(unsigned char *p, struct x25_address *called_addr,
 155                   struct x25_address *calling_addr)
 156 {
 157         unsigned int called_len, calling_len;
 158         char *called, *calling;
 159         int i;
 160 
 161         called  = called_addr->x25_addr;
 162         calling = calling_addr->x25_addr;
 163 
 164         called_len  = strlen(called);
 165         calling_len = strlen(calling);
 166 
 167         *p++ = (calling_len << 4) | (called_len << 0);
 168 
 169         for (i = 0; i < (called_len + calling_len); i++) {
 170                 if (i < called_len) {
 171                         if (i % 2 != 0) {
 172                                 *p |= (*called++ - '0') << 0;
 173                                 p++;
 174                         } else {
 175                                 *p = 0x00;
 176                                 *p |= (*called++ - '0') << 4;
 177                         }
 178                 } else {
 179                         if (i % 2 != 0) {
 180                                 *p |= (*calling++ - '0') << 0;
 181                                 p++;
 182                         } else {
 183                                 *p = 0x00;
 184                                 *p |= (*calling++ - '0') << 4;
 185                         }
 186                 }
 187         }
 188 
 189         return 1 + (called_len + calling_len + 1) / 2;
 190 }
 191 
 192 /*
 193  *      Socket removal during an interrupt is now safe.
 194  */
 195 static void x25_remove_socket(struct sock *sk)
 196 {
 197         write_lock_bh(&x25_list_lock);
 198         sk_del_node_init(sk);
 199         write_unlock_bh(&x25_list_lock);
 200 }
 201 
 202 /*
 203  *      Kill all bound sockets on a dropped device.
 204  */
 205 static void x25_kill_by_device(struct net_device *dev)
 206 {
 207         struct sock *s;
 208 
 209         write_lock_bh(&x25_list_lock);
 210 
 211         sk_for_each(s, &x25_list)
 212                 if (x25_sk(s)->neighbour && x25_sk(s)->neighbour->dev == dev)
 213                         x25_disconnect(s, ENETUNREACH, 0, 0);
 214 
 215         write_unlock_bh(&x25_list_lock);
 216 }
 217 
 218 /*
 219  *      Handle device status changes.
 220  */
 221 static int x25_device_event(struct notifier_block *this, unsigned long event,
 222                             void *ptr)
 223 {
 224         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 225         struct x25_neigh *nb;
 226 
 227         if (!net_eq(dev_net(dev), &init_net))
 228                 return NOTIFY_DONE;
 229 
 230         if (dev->type == ARPHRD_X25
 231 #if IS_ENABLED(CONFIG_LLC)
 232          || dev->type == ARPHRD_ETHER
 233 #endif
 234          ) {
 235                 switch (event) {
 236                 case NETDEV_UP:
 237                         x25_link_device_up(dev);
 238                         break;
 239                 case NETDEV_GOING_DOWN:
 240                         nb = x25_get_neigh(dev);
 241                         if (nb) {
 242                                 x25_terminate_link(nb);
 243                                 x25_neigh_put(nb);
 244                         }
 245                         break;
 246                 case NETDEV_DOWN:
 247                         x25_kill_by_device(dev);
 248                         x25_route_device_down(dev);
 249                         x25_link_device_down(dev);
 250                         break;
 251                 }
 252         }
 253 
 254         return NOTIFY_DONE;
 255 }
 256 
 257 /*
 258  *      Add a socket to the bound sockets list.
 259  */
 260 static void x25_insert_socket(struct sock *sk)
 261 {
 262         write_lock_bh(&x25_list_lock);
 263         sk_add_node(sk, &x25_list);
 264         write_unlock_bh(&x25_list_lock);
 265 }
 266 
 267 /*
 268  *      Find a socket that wants to accept the Call Request we just
 269  *      received. Check the full list for an address/cud match.
 270  *      If no cuds match return the next_best thing, an address match.
 271  *      Note: if a listening socket has cud set it must only get calls
 272  *      with matching cud.
 273  */
 274 static struct sock *x25_find_listener(struct x25_address *addr,
 275                                         struct sk_buff *skb)
 276 {
 277         struct sock *s;
 278         struct sock *next_best;
 279 
 280         read_lock_bh(&x25_list_lock);
 281         next_best = NULL;
 282 
 283         sk_for_each(s, &x25_list)
 284                 if ((!strcmp(addr->x25_addr,
 285                         x25_sk(s)->source_addr.x25_addr) ||
 286                                 !strcmp(x25_sk(s)->source_addr.x25_addr,
 287                                         null_x25_address.x25_addr)) &&
 288                                         s->sk_state == TCP_LISTEN) {
 289                         /*
 290                          * Found a listening socket, now check the incoming
 291                          * call user data vs this sockets call user data
 292                          */
 293                         if (x25_sk(s)->cudmatchlength > 0 &&
 294                                 skb->len >= x25_sk(s)->cudmatchlength) {
 295                                 if((memcmp(x25_sk(s)->calluserdata.cuddata,
 296                                         skb->data,
 297                                         x25_sk(s)->cudmatchlength)) == 0) {
 298                                         sock_hold(s);
 299                                         goto found;
 300                                  }
 301                         } else
 302                                 next_best = s;
 303                 }
 304         if (next_best) {
 305                 s = next_best;
 306                 sock_hold(s);
 307                 goto found;
 308         }
 309         s = NULL;
 310 found:
 311         read_unlock_bh(&x25_list_lock);
 312         return s;
 313 }
 314 
 315 /*
 316  *      Find a connected X.25 socket given my LCI and neighbour.
 317  */
 318 static struct sock *__x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 319 {
 320         struct sock *s;
 321 
 322         sk_for_each(s, &x25_list)
 323                 if (x25_sk(s)->lci == lci && x25_sk(s)->neighbour == nb) {
 324                         sock_hold(s);
 325                         goto found;
 326                 }
 327         s = NULL;
 328 found:
 329         return s;
 330 }
 331 
 332 struct sock *x25_find_socket(unsigned int lci, struct x25_neigh *nb)
 333 {
 334         struct sock *s;
 335 
 336         read_lock_bh(&x25_list_lock);
 337         s = __x25_find_socket(lci, nb);
 338         read_unlock_bh(&x25_list_lock);
 339         return s;
 340 }
 341 
 342 /*
 343  *      Find a unique LCI for a given device.
 344  */
 345 static unsigned int x25_new_lci(struct x25_neigh *nb)
 346 {
 347         unsigned int lci = 1;
 348         struct sock *sk;
 349 
 350         while ((sk = x25_find_socket(lci, nb)) != NULL) {
 351                 sock_put(sk);
 352                 if (++lci == 4096) {
 353                         lci = 0;
 354                         break;
 355                 }
 356                 cond_resched();
 357         }
 358 
 359         return lci;
 360 }
 361 
 362 /*
 363  *      Deferred destroy.
 364  */
 365 static void __x25_destroy_socket(struct sock *);
 366 
 367 /*
 368  *      handler for deferred kills.
 369  */
 370 static void x25_destroy_timer(struct timer_list *t)
 371 {
 372         struct sock *sk = from_timer(sk, t, sk_timer);
 373 
 374         x25_destroy_socket_from_timer(sk);
 375 }
 376 
 377 /*
 378  *      This is called from user mode and the timers. Thus it protects itself
 379  *      against interrupt users but doesn't worry about being called during
 380  *      work. Once it is removed from the queue no interrupt or bottom half
 381  *      will touch it and we are (fairly 8-) ) safe.
 382  *      Not static as it's used by the timer
 383  */
 384 static void __x25_destroy_socket(struct sock *sk)
 385 {
 386         struct sk_buff *skb;
 387 
 388         x25_stop_heartbeat(sk);
 389         x25_stop_timer(sk);
 390 
 391         x25_remove_socket(sk);
 392         x25_clear_queues(sk);           /* Flush the queues */
 393 
 394         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 395                 if (skb->sk != sk) {            /* A pending connection */
 396                         /*
 397                          * Queue the unaccepted socket for death
 398                          */
 399                         skb->sk->sk_state = TCP_LISTEN;
 400                         sock_set_flag(skb->sk, SOCK_DEAD);
 401                         x25_start_heartbeat(skb->sk);
 402                         x25_sk(skb->sk)->state = X25_STATE_0;
 403                 }
 404 
 405                 kfree_skb(skb);
 406         }
 407 
 408         if (sk_has_allocations(sk)) {
 409                 /* Defer: outstanding buffers */
 410                 sk->sk_timer.expires  = jiffies + 10 * HZ;
 411                 sk->sk_timer.function = x25_destroy_timer;
 412                 add_timer(&sk->sk_timer);
 413         } else {
 414                 /* drop last reference so sock_put will free */
 415                 __sock_put(sk);
 416         }
 417 }
 418 
 419 void x25_destroy_socket_from_timer(struct sock *sk)
 420 {
 421         sock_hold(sk);
 422         bh_lock_sock(sk);
 423         __x25_destroy_socket(sk);
 424         bh_unlock_sock(sk);
 425         sock_put(sk);
 426 }
 427 
 428 /*
 429  *      Handling for system calls applied via the various interfaces to a
 430  *      X.25 socket object.
 431  */
 432 
 433 static int x25_setsockopt(struct socket *sock, int level, int optname,
 434                           char __user *optval, unsigned int optlen)
 435 {
 436         int opt;
 437         struct sock *sk = sock->sk;
 438         int rc = -ENOPROTOOPT;
 439 
 440         if (level != SOL_X25 || optname != X25_QBITINCL)
 441                 goto out;
 442 
 443         rc = -EINVAL;
 444         if (optlen < sizeof(int))
 445                 goto out;
 446 
 447         rc = -EFAULT;
 448         if (get_user(opt, (int __user *)optval))
 449                 goto out;
 450 
 451         if (opt)
 452                 set_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 453         else
 454                 clear_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 455         rc = 0;
 456 out:
 457         return rc;
 458 }
 459 
 460 static int x25_getsockopt(struct socket *sock, int level, int optname,
 461                           char __user *optval, int __user *optlen)
 462 {
 463         struct sock *sk = sock->sk;
 464         int val, len, rc = -ENOPROTOOPT;
 465 
 466         if (level != SOL_X25 || optname != X25_QBITINCL)
 467                 goto out;
 468 
 469         rc = -EFAULT;
 470         if (get_user(len, optlen))
 471                 goto out;
 472 
 473         len = min_t(unsigned int, len, sizeof(int));
 474 
 475         rc = -EINVAL;
 476         if (len < 0)
 477                 goto out;
 478 
 479         rc = -EFAULT;
 480         if (put_user(len, optlen))
 481                 goto out;
 482 
 483         val = test_bit(X25_Q_BIT_FLAG, &x25_sk(sk)->flags);
 484         rc = copy_to_user(optval, &val, len) ? -EFAULT : 0;
 485 out:
 486         return rc;
 487 }
 488 
 489 static int x25_listen(struct socket *sock, int backlog)
 490 {
 491         struct sock *sk = sock->sk;
 492         int rc = -EOPNOTSUPP;
 493 
 494         lock_sock(sk);
 495         if (sk->sk_state != TCP_LISTEN) {
 496                 memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN);
 497                 sk->sk_max_ack_backlog = backlog;
 498                 sk->sk_state           = TCP_LISTEN;
 499                 rc = 0;
 500         }
 501         release_sock(sk);
 502 
 503         return rc;
 504 }
 505 
 506 static struct proto x25_proto = {
 507         .name     = "X25",
 508         .owner    = THIS_MODULE,
 509         .obj_size = sizeof(struct x25_sock),
 510 };
 511 
 512 static struct sock *x25_alloc_socket(struct net *net, int kern)
 513 {
 514         struct x25_sock *x25;
 515         struct sock *sk = sk_alloc(net, AF_X25, GFP_ATOMIC, &x25_proto, kern);
 516 
 517         if (!sk)
 518                 goto out;
 519 
 520         sock_init_data(NULL, sk);
 521 
 522         x25 = x25_sk(sk);
 523         skb_queue_head_init(&x25->ack_queue);
 524         skb_queue_head_init(&x25->fragment_queue);
 525         skb_queue_head_init(&x25->interrupt_in_queue);
 526         skb_queue_head_init(&x25->interrupt_out_queue);
 527 out:
 528         return sk;
 529 }
 530 
 531 static int x25_create(struct net *net, struct socket *sock, int protocol,
 532                       int kern)
 533 {
 534         struct sock *sk;
 535         struct x25_sock *x25;
 536         int rc = -EAFNOSUPPORT;
 537 
 538         if (!net_eq(net, &init_net))
 539                 goto out;
 540 
 541         rc = -ESOCKTNOSUPPORT;
 542         if (sock->type != SOCK_SEQPACKET)
 543                 goto out;
 544 
 545         rc = -EINVAL;
 546         if (protocol)
 547                 goto out;
 548 
 549         rc = -ENOBUFS;
 550         if ((sk = x25_alloc_socket(net, kern)) == NULL)
 551                 goto out;
 552 
 553         x25 = x25_sk(sk);
 554 
 555         sock_init_data(sock, sk);
 556 
 557         x25_init_timers(sk);
 558 
 559         sock->ops    = &x25_proto_ops;
 560         sk->sk_protocol = protocol;
 561         sk->sk_backlog_rcv = x25_backlog_rcv;
 562 
 563         x25->t21   = sysctl_x25_call_request_timeout;
 564         x25->t22   = sysctl_x25_reset_request_timeout;
 565         x25->t23   = sysctl_x25_clear_request_timeout;
 566         x25->t2    = sysctl_x25_ack_holdback_timeout;
 567         x25->state = X25_STATE_0;
 568         x25->cudmatchlength = 0;
 569         set_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);     /* normally no cud  */
 570                                                         /* on call accept   */
 571 
 572         x25->facilities.winsize_in  = X25_DEFAULT_WINDOW_SIZE;
 573         x25->facilities.winsize_out = X25_DEFAULT_WINDOW_SIZE;
 574         x25->facilities.pacsize_in  = X25_DEFAULT_PACKET_SIZE;
 575         x25->facilities.pacsize_out = X25_DEFAULT_PACKET_SIZE;
 576         x25->facilities.throughput  = 0;        /* by default don't negotiate
 577                                                    throughput */
 578         x25->facilities.reverse     = X25_DEFAULT_REVERSE;
 579         x25->dte_facilities.calling_len = 0;
 580         x25->dte_facilities.called_len = 0;
 581         memset(x25->dte_facilities.called_ae, '\0',
 582                         sizeof(x25->dte_facilities.called_ae));
 583         memset(x25->dte_facilities.calling_ae, '\0',
 584                         sizeof(x25->dte_facilities.calling_ae));
 585 
 586         rc = 0;
 587 out:
 588         return rc;
 589 }
 590 
 591 static struct sock *x25_make_new(struct sock *osk)
 592 {
 593         struct sock *sk = NULL;
 594         struct x25_sock *x25, *ox25;
 595 
 596         if (osk->sk_type != SOCK_SEQPACKET)
 597                 goto out;
 598 
 599         if ((sk = x25_alloc_socket(sock_net(osk), 0)) == NULL)
 600                 goto out;
 601 
 602         x25 = x25_sk(sk);
 603 
 604         sk->sk_type        = osk->sk_type;
 605         sk->sk_priority    = osk->sk_priority;
 606         sk->sk_protocol    = osk->sk_protocol;
 607         sk->sk_rcvbuf      = osk->sk_rcvbuf;
 608         sk->sk_sndbuf      = osk->sk_sndbuf;
 609         sk->sk_state       = TCP_ESTABLISHED;
 610         sk->sk_backlog_rcv = osk->sk_backlog_rcv;
 611         sock_copy_flags(sk, osk);
 612 
 613         ox25 = x25_sk(osk);
 614         x25->t21        = ox25->t21;
 615         x25->t22        = ox25->t22;
 616         x25->t23        = ox25->t23;
 617         x25->t2         = ox25->t2;
 618         x25->flags      = ox25->flags;
 619         x25->facilities = ox25->facilities;
 620         x25->dte_facilities = ox25->dte_facilities;
 621         x25->cudmatchlength = ox25->cudmatchlength;
 622 
 623         clear_bit(X25_INTERRUPT_FLAG, &x25->flags);
 624         x25_init_timers(sk);
 625 out:
 626         return sk;
 627 }
 628 
 629 static int x25_release(struct socket *sock)
 630 {
 631         struct sock *sk = sock->sk;
 632         struct x25_sock *x25;
 633 
 634         if (!sk)
 635                 return 0;
 636 
 637         x25 = x25_sk(sk);
 638 
 639         sock_hold(sk);
 640         lock_sock(sk);
 641         switch (x25->state) {
 642 
 643                 case X25_STATE_0:
 644                 case X25_STATE_2:
 645                         x25_disconnect(sk, 0, 0, 0);
 646                         __x25_destroy_socket(sk);
 647                         goto out;
 648 
 649                 case X25_STATE_1:
 650                 case X25_STATE_3:
 651                 case X25_STATE_4:
 652                         x25_clear_queues(sk);
 653                         x25_write_internal(sk, X25_CLEAR_REQUEST);
 654                         x25_start_t23timer(sk);
 655                         x25->state = X25_STATE_2;
 656                         sk->sk_state    = TCP_CLOSE;
 657                         sk->sk_shutdown |= SEND_SHUTDOWN;
 658                         sk->sk_state_change(sk);
 659                         sock_set_flag(sk, SOCK_DEAD);
 660                         sock_set_flag(sk, SOCK_DESTROY);
 661                         break;
 662         }
 663 
 664         sock_orphan(sk);
 665 out:
 666         release_sock(sk);
 667         sock_put(sk);
 668         return 0;
 669 }
 670 
 671 static int x25_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 672 {
 673         struct sock *sk = sock->sk;
 674         struct sockaddr_x25 *addr = (struct sockaddr_x25 *)uaddr;
 675         int len, i, rc = 0;
 676 
 677         if (addr_len != sizeof(struct sockaddr_x25) ||
 678             addr->sx25_family != AF_X25) {
 679                 rc = -EINVAL;
 680                 goto out;
 681         }
 682 
 683         /* check for the null_x25_address */
 684         if (strcmp(addr->sx25_addr.x25_addr, null_x25_address.x25_addr)) {
 685 
 686                 len = strlen(addr->sx25_addr.x25_addr);
 687                 for (i = 0; i < len; i++) {
 688                         if (!isdigit(addr->sx25_addr.x25_addr[i])) {
 689                                 rc = -EINVAL;
 690                                 goto out;
 691                         }
 692                 }
 693         }
 694 
 695         lock_sock(sk);
 696         if (sock_flag(sk, SOCK_ZAPPED)) {
 697                 x25_sk(sk)->source_addr = addr->sx25_addr;
 698                 x25_insert_socket(sk);
 699                 sock_reset_flag(sk, SOCK_ZAPPED);
 700         } else {
 701                 rc = -EINVAL;
 702         }
 703         release_sock(sk);
 704         SOCK_DEBUG(sk, "x25_bind: socket is bound\n");
 705 out:
 706         return rc;
 707 }
 708 
 709 static 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 
 738 static 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         rc = -EALREADY; /* Do nothing if call is already in progress */
 764         if (sk->sk_state == TCP_SYN_SENT)
 765                 goto out;
 766 
 767         sk->sk_state   = TCP_CLOSE;
 768         sock->state = SS_UNCONNECTED;
 769 
 770         rc = -EINVAL;
 771         if (addr_len != sizeof(struct sockaddr_x25) ||
 772             addr->sx25_family != AF_X25)
 773                 goto out;
 774 
 775         rc = -ENETUNREACH;
 776         rt = x25_get_route(&addr->sx25_addr);
 777         if (!rt)
 778                 goto out;
 779 
 780         x25->neighbour = x25_get_neigh(rt->dev);
 781         if (!x25->neighbour)
 782                 goto out_put_route;
 783 
 784         x25_limit_facilities(&x25->facilities, x25->neighbour);
 785 
 786         x25->lci = x25_new_lci(x25->neighbour);
 787         if (!x25->lci)
 788                 goto out_put_neigh;
 789 
 790         rc = -EINVAL;
 791         if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
 792                 goto out_put_neigh;
 793 
 794         if (!strcmp(x25->source_addr.x25_addr, null_x25_address.x25_addr))
 795                 memset(&x25->source_addr, '\0', X25_ADDR_LEN);
 796 
 797         x25->dest_addr = addr->sx25_addr;
 798 
 799         /* Move to connecting socket, start sending Connect Requests */
 800         sock->state   = SS_CONNECTING;
 801         sk->sk_state  = TCP_SYN_SENT;
 802 
 803         x25->state = X25_STATE_1;
 804 
 805         x25_write_internal(sk, X25_CALL_REQUEST);
 806 
 807         x25_start_heartbeat(sk);
 808         x25_start_t21timer(sk);
 809 
 810         /* Now the loop */
 811         rc = -EINPROGRESS;
 812         if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 813                 goto out;
 814 
 815         rc = x25_wait_for_connection_establishment(sk);
 816         if (rc)
 817                 goto out_put_neigh;
 818 
 819         sock->state = SS_CONNECTED;
 820         rc = 0;
 821 out_put_neigh:
 822         if (rc) {
 823                 read_lock_bh(&x25_list_lock);
 824                 x25_neigh_put(x25->neighbour);
 825                 x25->neighbour = NULL;
 826                 read_unlock_bh(&x25_list_lock);
 827                 x25->state = X25_STATE_0;
 828         }
 829 out_put_route:
 830         x25_route_put(rt);
 831 out:
 832         release_sock(sk);
 833         return rc;
 834 }
 835 
 836 static int x25_wait_for_data(struct sock *sk, long timeout)
 837 {
 838         DECLARE_WAITQUEUE(wait, current);
 839         int rc = 0;
 840 
 841         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 842         for (;;) {
 843                 __set_current_state(TASK_INTERRUPTIBLE);
 844                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 845                         break;
 846                 rc = -ERESTARTSYS;
 847                 if (signal_pending(current))
 848                         break;
 849                 rc = -EAGAIN;
 850                 if (!timeout)
 851                         break;
 852                 rc = 0;
 853                 if (skb_queue_empty(&sk->sk_receive_queue)) {
 854                         release_sock(sk);
 855                         timeout = schedule_timeout(timeout);
 856                         lock_sock(sk);
 857                 } else
 858                         break;
 859         }
 860         __set_current_state(TASK_RUNNING);
 861         remove_wait_queue(sk_sleep(sk), &wait);
 862         return rc;
 863 }
 864 
 865 static int x25_accept(struct socket *sock, struct socket *newsock, int flags,
 866                       bool kern)
 867 {
 868         struct sock *sk = sock->sk;
 869         struct sock *newsk;
 870         struct sk_buff *skb;
 871         int rc = -EINVAL;
 872 
 873         if (!sk)
 874                 goto out;
 875 
 876         rc = -EOPNOTSUPP;
 877         if (sk->sk_type != SOCK_SEQPACKET)
 878                 goto out;
 879 
 880         lock_sock(sk);
 881         rc = -EINVAL;
 882         if (sk->sk_state != TCP_LISTEN)
 883                 goto out2;
 884 
 885         rc = x25_wait_for_data(sk, sk->sk_rcvtimeo);
 886         if (rc)
 887                 goto out2;
 888         skb = skb_dequeue(&sk->sk_receive_queue);
 889         rc = -EINVAL;
 890         if (!skb->sk)
 891                 goto out2;
 892         newsk            = skb->sk;
 893         sock_graft(newsk, newsock);
 894 
 895         /* Now attach up the new socket */
 896         skb->sk = NULL;
 897         kfree_skb(skb);
 898         sk->sk_ack_backlog--;
 899         newsock->state = SS_CONNECTED;
 900         rc = 0;
 901 out2:
 902         release_sock(sk);
 903 out:
 904         return rc;
 905 }
 906 
 907 static int x25_getname(struct socket *sock, struct sockaddr *uaddr,
 908                        int peer)
 909 {
 910         struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)uaddr;
 911         struct sock *sk = sock->sk;
 912         struct x25_sock *x25 = x25_sk(sk);
 913         int rc = 0;
 914 
 915         if (peer) {
 916                 if (sk->sk_state != TCP_ESTABLISHED) {
 917                         rc = -ENOTCONN;
 918                         goto out;
 919                 }
 920                 sx25->sx25_addr = x25->dest_addr;
 921         } else
 922                 sx25->sx25_addr = x25->source_addr;
 923 
 924         sx25->sx25_family = AF_X25;
 925         rc = sizeof(*sx25);
 926 
 927 out:
 928         return rc;
 929 }
 930 
 931 int x25_rx_call_request(struct sk_buff *skb, struct x25_neigh *nb,
 932                         unsigned int lci)
 933 {
 934         struct sock *sk;
 935         struct sock *make;
 936         struct x25_sock *makex25;
 937         struct x25_address source_addr, dest_addr;
 938         struct x25_facilities facilities;
 939         struct x25_dte_facilities dte_facilities;
 940         int len, addr_len, rc;
 941 
 942         /*
 943          *      Remove the LCI and frame type.
 944          */
 945         skb_pull(skb, X25_STD_MIN_LEN);
 946 
 947         /*
 948          *      Extract the X.25 addresses and convert them to ASCII strings,
 949          *      and remove them.
 950          *
 951          *      Address block is mandatory in call request packets
 952          */
 953         addr_len = x25_parse_address_block(skb, &source_addr, &dest_addr);
 954         if (addr_len <= 0)
 955                 goto out_clear_request;
 956         skb_pull(skb, addr_len);
 957 
 958         /*
 959          *      Get the length of the facilities, skip past them for the moment
 960          *      get the call user data because this is needed to determine
 961          *      the correct listener
 962          *
 963          *      Facilities length is mandatory in call request packets
 964          */
 965         if (!pskb_may_pull(skb, 1))
 966                 goto out_clear_request;
 967         len = skb->data[0] + 1;
 968         if (!pskb_may_pull(skb, len))
 969                 goto out_clear_request;
 970         skb_pull(skb,len);
 971 
 972         /*
 973          *      Ensure that the amount of call user data is valid.
 974          */
 975         if (skb->len > X25_MAX_CUD_LEN)
 976                 goto out_clear_request;
 977 
 978         /*
 979          *      Get all the call user data so it can be used in
 980          *      x25_find_listener and skb_copy_from_linear_data up ahead.
 981          */
 982         if (!pskb_may_pull(skb, skb->len))
 983                 goto out_clear_request;
 984 
 985         /*
 986          *      Find a listener for the particular address/cud pair.
 987          */
 988         sk = x25_find_listener(&source_addr,skb);
 989         skb_push(skb,len);
 990 
 991         if (sk != NULL && sk_acceptq_is_full(sk)) {
 992                 goto out_sock_put;
 993         }
 994 
 995         /*
 996          *      We dont have any listeners for this incoming call.
 997          *      Try forwarding it.
 998          */
 999         if (sk == NULL) {
1000                 skb_push(skb, addr_len + X25_STD_MIN_LEN);
1001                 if (sysctl_x25_forward &&
1002                                 x25_forward_call(&dest_addr, nb, skb, lci) > 0)
1003                 {
1004                         /* Call was forwarded, dont process it any more */
1005                         kfree_skb(skb);
1006                         rc = 1;
1007                         goto out;
1008                 } else {
1009                         /* No listeners, can't forward, clear the call */
1010                         goto out_clear_request;
1011                 }
1012         }
1013 
1014         /*
1015          *      Try to reach a compromise on the requested facilities.
1016          */
1017         len = x25_negotiate_facilities(skb, sk, &facilities, &dte_facilities);
1018         if (len == -1)
1019                 goto out_sock_put;
1020 
1021         /*
1022          * current neighbour/link might impose additional limits
1023          * on certain facilties
1024          */
1025 
1026         x25_limit_facilities(&facilities, nb);
1027 
1028         /*
1029          *      Try to create a new socket.
1030          */
1031         make = x25_make_new(sk);
1032         if (!make)
1033                 goto out_sock_put;
1034 
1035         /*
1036          *      Remove the facilities
1037          */
1038         skb_pull(skb, len);
1039 
1040         skb->sk     = make;
1041         make->sk_state = TCP_ESTABLISHED;
1042 
1043         makex25 = x25_sk(make);
1044         makex25->lci           = lci;
1045         makex25->dest_addr     = dest_addr;
1046         makex25->source_addr   = source_addr;
1047         makex25->neighbour     = nb;
1048         makex25->facilities    = facilities;
1049         makex25->dte_facilities= dte_facilities;
1050         makex25->vc_facil_mask = x25_sk(sk)->vc_facil_mask;
1051         /* ensure no reverse facil on accept */
1052         makex25->vc_facil_mask &= ~X25_MASK_REVERSE;
1053         /* ensure no calling address extension on accept */
1054         makex25->vc_facil_mask &= ~X25_MASK_CALLING_AE;
1055         makex25->cudmatchlength = x25_sk(sk)->cudmatchlength;
1056 
1057         /* Normally all calls are accepted immediately */
1058         if (test_bit(X25_ACCPT_APPRV_FLAG, &makex25->flags)) {
1059                 x25_write_internal(make, X25_CALL_ACCEPTED);
1060                 makex25->state = X25_STATE_3;
1061         }
1062 
1063         /*
1064          *      Incoming Call User Data.
1065          */
1066         skb_copy_from_linear_data(skb, makex25->calluserdata.cuddata, skb->len);
1067         makex25->calluserdata.cudlength = skb->len;
1068 
1069         sk->sk_ack_backlog++;
1070 
1071         x25_insert_socket(make);
1072 
1073         skb_queue_head(&sk->sk_receive_queue, skb);
1074 
1075         x25_start_heartbeat(make);
1076 
1077         if (!sock_flag(sk, SOCK_DEAD))
1078                 sk->sk_data_ready(sk);
1079         rc = 1;
1080         sock_put(sk);
1081 out:
1082         return rc;
1083 out_sock_put:
1084         sock_put(sk);
1085 out_clear_request:
1086         rc = 0;
1087         x25_transmit_clear_request(nb, lci, 0x01);
1088         goto out;
1089 }
1090 
1091 static int x25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1092 {
1093         struct sock *sk = sock->sk;
1094         struct x25_sock *x25 = x25_sk(sk);
1095         DECLARE_SOCKADDR(struct sockaddr_x25 *, usx25, msg->msg_name);
1096         struct sockaddr_x25 sx25;
1097         struct sk_buff *skb;
1098         unsigned char *asmptr;
1099         int noblock = msg->msg_flags & MSG_DONTWAIT;
1100         size_t size;
1101         int qbit = 0, rc = -EINVAL;
1102 
1103         lock_sock(sk);
1104         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_OOB|MSG_EOR|MSG_CMSG_COMPAT))
1105                 goto out;
1106 
1107         /* we currently don't support segmented records at the user interface */
1108         if (!(msg->msg_flags & (MSG_EOR|MSG_OOB)))
1109                 goto out;
1110 
1111         rc = -EADDRNOTAVAIL;
1112         if (sock_flag(sk, SOCK_ZAPPED))
1113                 goto out;
1114 
1115         rc = -EPIPE;
1116         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1117                 send_sig(SIGPIPE, current, 0);
1118                 goto out;
1119         }
1120 
1121         rc = -ENETUNREACH;
1122         if (!x25->neighbour)
1123                 goto out;
1124 
1125         if (usx25) {
1126                 rc = -EINVAL;
1127                 if (msg->msg_namelen < sizeof(sx25))
1128                         goto out;
1129                 memcpy(&sx25, usx25, sizeof(sx25));
1130                 rc = -EISCONN;
1131                 if (strcmp(x25->dest_addr.x25_addr, sx25.sx25_addr.x25_addr))
1132                         goto out;
1133                 rc = -EINVAL;
1134                 if (sx25.sx25_family != AF_X25)
1135                         goto out;
1136         } else {
1137                 /*
1138                  *      FIXME 1003.1g - if the socket is like this because
1139                  *      it has become closed (not started closed) we ought
1140                  *      to SIGPIPE, EPIPE;
1141                  */
1142                 rc = -ENOTCONN;
1143                 if (sk->sk_state != TCP_ESTABLISHED)
1144                         goto out;
1145 
1146                 sx25.sx25_family = AF_X25;
1147                 sx25.sx25_addr   = x25->dest_addr;
1148         }
1149 
1150         /* Sanity check the packet size */
1151         if (len > 65535) {
1152                 rc = -EMSGSIZE;
1153                 goto out;
1154         }
1155 
1156         SOCK_DEBUG(sk, "x25_sendmsg: sendto: Addresses built.\n");
1157 
1158         /* Build a packet */
1159         SOCK_DEBUG(sk, "x25_sendmsg: sendto: building packet.\n");
1160 
1161         if ((msg->msg_flags & MSG_OOB) && len > 32)
1162                 len = 32;
1163 
1164         size = len + X25_MAX_L2_LEN + X25_EXT_MIN_LEN;
1165 
1166         release_sock(sk);
1167         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
1168         lock_sock(sk);
1169         if (!skb)
1170                 goto out;
1171         X25_SKB_CB(skb)->flags = msg->msg_flags;
1172 
1173         skb_reserve(skb, X25_MAX_L2_LEN + X25_EXT_MIN_LEN);
1174 
1175         /*
1176          *      Put the data on the end
1177          */
1178         SOCK_DEBUG(sk, "x25_sendmsg: Copying user data\n");
1179 
1180         skb_reset_transport_header(skb);
1181         skb_put(skb, len);
1182 
1183         rc = memcpy_from_msg(skb_transport_header(skb), msg, len);
1184         if (rc)
1185                 goto out_kfree_skb;
1186 
1187         /*
1188          *      If the Q BIT Include socket option is in force, the first
1189          *      byte of the user data is the logical value of the Q Bit.
1190          */
1191         if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1192                 if (!pskb_may_pull(skb, 1))
1193                         goto out_kfree_skb;
1194 
1195                 qbit = skb->data[0];
1196                 skb_pull(skb, 1);
1197         }
1198 
1199         /*
1200          *      Push down the X.25 header
1201          */
1202         SOCK_DEBUG(sk, "x25_sendmsg: Building X.25 Header.\n");
1203 
1204         if (msg->msg_flags & MSG_OOB) {
1205                 if (x25->neighbour->extended) {
1206                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1207                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1208                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1209                         *asmptr++ = X25_INTERRUPT;
1210                 } else {
1211                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1212                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1213                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1214                         *asmptr++ = X25_INTERRUPT;
1215                 }
1216         } else {
1217                 if (x25->neighbour->extended) {
1218                         /* Build an Extended X.25 header */
1219                         asmptr    = skb_push(skb, X25_EXT_MIN_LEN);
1220                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_EXTSEQ;
1221                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1222                         *asmptr++ = X25_DATA;
1223                         *asmptr++ = X25_DATA;
1224                 } else {
1225                         /* Build an Standard X.25 header */
1226                         asmptr    = skb_push(skb, X25_STD_MIN_LEN);
1227                         *asmptr++ = ((x25->lci >> 8) & 0x0F) | X25_GFI_STDSEQ;
1228                         *asmptr++ = (x25->lci >> 0) & 0xFF;
1229                         *asmptr++ = X25_DATA;
1230                 }
1231 
1232                 if (qbit)
1233                         skb->data[0] |= X25_Q_BIT;
1234         }
1235 
1236         SOCK_DEBUG(sk, "x25_sendmsg: Built header.\n");
1237         SOCK_DEBUG(sk, "x25_sendmsg: Transmitting buffer\n");
1238 
1239         rc = -ENOTCONN;
1240         if (sk->sk_state != TCP_ESTABLISHED)
1241                 goto out_kfree_skb;
1242 
1243         if (msg->msg_flags & MSG_OOB)
1244                 skb_queue_tail(&x25->interrupt_out_queue, skb);
1245         else {
1246                 rc = x25_output(sk, skb);
1247                 len = rc;
1248                 if (rc < 0)
1249                         kfree_skb(skb);
1250                 else if (test_bit(X25_Q_BIT_FLAG, &x25->flags))
1251                         len++;
1252         }
1253 
1254         x25_kick(sk);
1255         rc = len;
1256 out:
1257         release_sock(sk);
1258         return rc;
1259 out_kfree_skb:
1260         kfree_skb(skb);
1261         goto out;
1262 }
1263 
1264 
1265 static int x25_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1266                        int flags)
1267 {
1268         struct sock *sk = sock->sk;
1269         struct x25_sock *x25 = x25_sk(sk);
1270         DECLARE_SOCKADDR(struct sockaddr_x25 *, sx25, msg->msg_name);
1271         size_t copied;
1272         int qbit, header_len;
1273         struct sk_buff *skb;
1274         unsigned char *asmptr;
1275         int rc = -ENOTCONN;
1276 
1277         lock_sock(sk);
1278 
1279         if (x25->neighbour == NULL)
1280                 goto out;
1281 
1282         header_len = x25->neighbour->extended ?
1283                 X25_EXT_MIN_LEN : X25_STD_MIN_LEN;
1284 
1285         /*
1286          * This works for seqpacket too. The receiver has ordered the queue for
1287          * us! We do one quick check first though
1288          */
1289         if (sk->sk_state != TCP_ESTABLISHED)
1290                 goto out;
1291 
1292         if (flags & MSG_OOB) {
1293                 rc = -EINVAL;
1294                 if (sock_flag(sk, SOCK_URGINLINE) ||
1295                     !skb_peek(&x25->interrupt_in_queue))
1296                         goto out;
1297 
1298                 skb = skb_dequeue(&x25->interrupt_in_queue);
1299 
1300                 if (!pskb_may_pull(skb, X25_STD_MIN_LEN))
1301                         goto out_free_dgram;
1302 
1303                 skb_pull(skb, X25_STD_MIN_LEN);
1304 
1305                 /*
1306                  *      No Q bit information on Interrupt data.
1307                  */
1308                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1309                         asmptr  = skb_push(skb, 1);
1310                         *asmptr = 0x00;
1311                 }
1312 
1313                 msg->msg_flags |= MSG_OOB;
1314         } else {
1315                 /* Now we can treat all alike */
1316                 release_sock(sk);
1317                 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1318                                         flags & MSG_DONTWAIT, &rc);
1319                 lock_sock(sk);
1320                 if (!skb)
1321                         goto out;
1322 
1323                 if (!pskb_may_pull(skb, header_len))
1324                         goto out_free_dgram;
1325 
1326                 qbit = (skb->data[0] & X25_Q_BIT) == X25_Q_BIT;
1327 
1328                 skb_pull(skb, header_len);
1329 
1330                 if (test_bit(X25_Q_BIT_FLAG, &x25->flags)) {
1331                         asmptr  = skb_push(skb, 1);
1332                         *asmptr = qbit;
1333                 }
1334         }
1335 
1336         skb_reset_transport_header(skb);
1337         copied = skb->len;
1338 
1339         if (copied > size) {
1340                 copied = size;
1341                 msg->msg_flags |= MSG_TRUNC;
1342         }
1343 
1344         /* Currently, each datagram always contains a complete record */
1345         msg->msg_flags |= MSG_EOR;
1346 
1347         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1348         if (rc)
1349                 goto out_free_dgram;
1350 
1351         if (sx25) {
1352                 sx25->sx25_family = AF_X25;
1353                 sx25->sx25_addr   = x25->dest_addr;
1354                 msg->msg_namelen = sizeof(*sx25);
1355         }
1356 
1357         x25_check_rbuf(sk);
1358         rc = copied;
1359 out_free_dgram:
1360         skb_free_datagram(sk, skb);
1361 out:
1362         release_sock(sk);
1363         return rc;
1364 }
1365 
1366 
1367 static int x25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1368 {
1369         struct sock *sk = sock->sk;
1370         struct x25_sock *x25 = x25_sk(sk);
1371         void __user *argp = (void __user *)arg;
1372         int rc;
1373 
1374         switch (cmd) {
1375         case TIOCOUTQ: {
1376                 int amount;
1377 
1378                 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1379                 if (amount < 0)
1380                         amount = 0;
1381                 rc = put_user(amount, (unsigned int __user *)argp);
1382                 break;
1383         }
1384 
1385         case TIOCINQ: {
1386                 struct sk_buff *skb;
1387                 int amount = 0;
1388                 /*
1389                  * These two are safe on a single CPU system as
1390                  * only user tasks fiddle here
1391                  */
1392                 lock_sock(sk);
1393                 if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
1394                         amount = skb->len;
1395                 release_sock(sk);
1396                 rc = put_user(amount, (unsigned int __user *)argp);
1397                 break;
1398         }
1399 
1400         case SIOCGIFADDR:
1401         case SIOCSIFADDR:
1402         case SIOCGIFDSTADDR:
1403         case SIOCSIFDSTADDR:
1404         case SIOCGIFBRDADDR:
1405         case SIOCSIFBRDADDR:
1406         case SIOCGIFNETMASK:
1407         case SIOCSIFNETMASK:
1408         case SIOCGIFMETRIC:
1409         case SIOCSIFMETRIC:
1410                 rc = -EINVAL;
1411                 break;
1412         case SIOCADDRT:
1413         case SIOCDELRT:
1414                 rc = -EPERM;
1415                 if (!capable(CAP_NET_ADMIN))
1416                         break;
1417                 rc = x25_route_ioctl(cmd, argp);
1418                 break;
1419         case SIOCX25GSUBSCRIP:
1420                 rc = x25_subscr_ioctl(cmd, argp);
1421                 break;
1422         case SIOCX25SSUBSCRIP:
1423                 rc = -EPERM;
1424                 if (!capable(CAP_NET_ADMIN))
1425                         break;
1426                 rc = x25_subscr_ioctl(cmd, argp);
1427                 break;
1428         case SIOCX25GFACILITIES: {
1429                 lock_sock(sk);
1430                 rc = copy_to_user(argp, &x25->facilities,
1431                                   sizeof(x25->facilities))
1432                         ? -EFAULT : 0;
1433                 release_sock(sk);
1434                 break;
1435         }
1436 
1437         case SIOCX25SFACILITIES: {
1438                 struct x25_facilities facilities;
1439                 rc = -EFAULT;
1440                 if (copy_from_user(&facilities, argp, sizeof(facilities)))
1441                         break;
1442                 rc = -EINVAL;
1443                 lock_sock(sk);
1444                 if (sk->sk_state != TCP_LISTEN &&
1445                     sk->sk_state != TCP_CLOSE)
1446                         goto out_fac_release;
1447                 if (facilities.pacsize_in < X25_PS16 ||
1448                     facilities.pacsize_in > X25_PS4096)
1449                         goto out_fac_release;
1450                 if (facilities.pacsize_out < X25_PS16 ||
1451                     facilities.pacsize_out > X25_PS4096)
1452                         goto out_fac_release;
1453                 if (facilities.winsize_in < 1 ||
1454                     facilities.winsize_in > 127)
1455                         goto out_fac_release;
1456                 if (facilities.throughput) {
1457                         int out = facilities.throughput & 0xf0;
1458                         int in  = facilities.throughput & 0x0f;
1459                         if (!out)
1460                                 facilities.throughput |=
1461                                         X25_DEFAULT_THROUGHPUT << 4;
1462                         else if (out < 0x30 || out > 0xD0)
1463                                 goto out_fac_release;
1464                         if (!in)
1465                                 facilities.throughput |=
1466                                         X25_DEFAULT_THROUGHPUT;
1467                         else if (in < 0x03 || in > 0x0D)
1468                                 goto out_fac_release;
1469                 }
1470                 if (facilities.reverse &&
1471                     (facilities.reverse & 0x81) != 0x81)
1472                         goto out_fac_release;
1473                 x25->facilities = facilities;
1474                 rc = 0;
1475 out_fac_release:
1476                 release_sock(sk);
1477                 break;
1478         }
1479 
1480         case SIOCX25GDTEFACILITIES: {
1481                 lock_sock(sk);
1482                 rc = copy_to_user(argp, &x25->dte_facilities,
1483                                   sizeof(x25->dte_facilities));
1484                 release_sock(sk);
1485                 if (rc)
1486                         rc = -EFAULT;
1487                 break;
1488         }
1489 
1490         case SIOCX25SDTEFACILITIES: {
1491                 struct x25_dte_facilities dtefacs;
1492                 rc = -EFAULT;
1493                 if (copy_from_user(&dtefacs, argp, sizeof(dtefacs)))
1494                         break;
1495                 rc = -EINVAL;
1496                 lock_sock(sk);
1497                 if (sk->sk_state != TCP_LISTEN &&
1498                     sk->sk_state != TCP_CLOSE)
1499                         goto out_dtefac_release;
1500                 if (dtefacs.calling_len > X25_MAX_AE_LEN)
1501                         goto out_dtefac_release;
1502                 if (dtefacs.called_len > X25_MAX_AE_LEN)
1503                         goto out_dtefac_release;
1504                 x25->dte_facilities = dtefacs;
1505                 rc = 0;
1506 out_dtefac_release:
1507                 release_sock(sk);
1508                 break;
1509         }
1510 
1511         case SIOCX25GCALLUSERDATA: {
1512                 lock_sock(sk);
1513                 rc = copy_to_user(argp, &x25->calluserdata,
1514                                   sizeof(x25->calluserdata))
1515                         ? -EFAULT : 0;
1516                 release_sock(sk);
1517                 break;
1518         }
1519 
1520         case SIOCX25SCALLUSERDATA: {
1521                 struct x25_calluserdata calluserdata;
1522 
1523                 rc = -EFAULT;
1524                 if (copy_from_user(&calluserdata, argp, sizeof(calluserdata)))
1525                         break;
1526                 rc = -EINVAL;
1527                 if (calluserdata.cudlength > X25_MAX_CUD_LEN)
1528                         break;
1529                 lock_sock(sk);
1530                 x25->calluserdata = calluserdata;
1531                 release_sock(sk);
1532                 rc = 0;
1533                 break;
1534         }
1535 
1536         case SIOCX25GCAUSEDIAG: {
1537                 lock_sock(sk);
1538                 rc = copy_to_user(argp, &x25->causediag, sizeof(x25->causediag))
1539                         ? -EFAULT : 0;
1540                 release_sock(sk);
1541                 break;
1542         }
1543 
1544         case SIOCX25SCAUSEDIAG: {
1545                 struct x25_causediag causediag;
1546                 rc = -EFAULT;
1547                 if (copy_from_user(&causediag, argp, sizeof(causediag)))
1548                         break;
1549                 lock_sock(sk);
1550                 x25->causediag = causediag;
1551                 release_sock(sk);
1552                 rc = 0;
1553                 break;
1554 
1555         }
1556 
1557         case SIOCX25SCUDMATCHLEN: {
1558                 struct x25_subaddr sub_addr;
1559                 rc = -EINVAL;
1560                 lock_sock(sk);
1561                 if(sk->sk_state != TCP_CLOSE)
1562                         goto out_cud_release;
1563                 rc = -EFAULT;
1564                 if (copy_from_user(&sub_addr, argp,
1565                                    sizeof(sub_addr)))
1566                         goto out_cud_release;
1567                 rc = -EINVAL;
1568                 if (sub_addr.cudmatchlength > X25_MAX_CUD_LEN)
1569                         goto out_cud_release;
1570                 x25->cudmatchlength = sub_addr.cudmatchlength;
1571                 rc = 0;
1572 out_cud_release:
1573                 release_sock(sk);
1574                 break;
1575         }
1576 
1577         case SIOCX25CALLACCPTAPPRV: {
1578                 rc = -EINVAL;
1579                 lock_sock(sk);
1580                 if (sk->sk_state == TCP_CLOSE) {
1581                         clear_bit(X25_ACCPT_APPRV_FLAG, &x25->flags);
1582                         rc = 0;
1583                 }
1584                 release_sock(sk);
1585                 break;
1586         }
1587 
1588         case SIOCX25SENDCALLACCPT:  {
1589                 rc = -EINVAL;
1590                 lock_sock(sk);
1591                 if (sk->sk_state != TCP_ESTABLISHED)
1592                         goto out_sendcallaccpt_release;
1593                 /* must call accptapprv above */
1594                 if (test_bit(X25_ACCPT_APPRV_FLAG, &x25->flags))
1595                         goto out_sendcallaccpt_release;
1596                 x25_write_internal(sk, X25_CALL_ACCEPTED);
1597                 x25->state = X25_STATE_3;
1598                 rc = 0;
1599 out_sendcallaccpt_release:
1600                 release_sock(sk);
1601                 break;
1602         }
1603 
1604         default:
1605                 rc = -ENOIOCTLCMD;
1606                 break;
1607         }
1608 
1609         return rc;
1610 }
1611 
1612 static const struct net_proto_family x25_family_ops = {
1613         .family =       AF_X25,
1614         .create =       x25_create,
1615         .owner  =       THIS_MODULE,
1616 };
1617 
1618 #ifdef CONFIG_COMPAT
1619 static int compat_x25_subscr_ioctl(unsigned int cmd,
1620                 struct compat_x25_subscrip_struct __user *x25_subscr32)
1621 {
1622         struct compat_x25_subscrip_struct x25_subscr;
1623         struct x25_neigh *nb;
1624         struct net_device *dev;
1625         int rc = -EINVAL;
1626 
1627         rc = -EFAULT;
1628         if (copy_from_user(&x25_subscr, x25_subscr32, sizeof(*x25_subscr32)))
1629                 goto out;
1630 
1631         rc = -EINVAL;
1632         dev = x25_dev_get(x25_subscr.device);
1633         if (dev == NULL)
1634                 goto out;
1635 
1636         nb = x25_get_neigh(dev);
1637         if (nb == NULL)
1638                 goto out_dev_put;
1639 
1640         dev_put(dev);
1641 
1642         if (cmd == SIOCX25GSUBSCRIP) {
1643                 read_lock_bh(&x25_neigh_list_lock);
1644                 x25_subscr.extended = nb->extended;
1645                 x25_subscr.global_facil_mask = nb->global_facil_mask;
1646                 read_unlock_bh(&x25_neigh_list_lock);
1647                 rc = copy_to_user(x25_subscr32, &x25_subscr,
1648                                 sizeof(*x25_subscr32)) ? -EFAULT : 0;
1649         } else {
1650                 rc = -EINVAL;
1651                 if (x25_subscr.extended == 0 || x25_subscr.extended == 1) {
1652                         rc = 0;
1653                         write_lock_bh(&x25_neigh_list_lock);
1654                         nb->extended = x25_subscr.extended;
1655                         nb->global_facil_mask = x25_subscr.global_facil_mask;
1656                         write_unlock_bh(&x25_neigh_list_lock);
1657                 }
1658         }
1659         x25_neigh_put(nb);
1660 out:
1661         return rc;
1662 out_dev_put:
1663         dev_put(dev);
1664         goto out;
1665 }
1666 
1667 static int compat_x25_ioctl(struct socket *sock, unsigned int cmd,
1668                                 unsigned long arg)
1669 {
1670         void __user *argp = compat_ptr(arg);
1671         int rc = -ENOIOCTLCMD;
1672 
1673         switch(cmd) {
1674         case TIOCOUTQ:
1675         case TIOCINQ:
1676                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1677                 break;
1678         case SIOCGIFADDR:
1679         case SIOCSIFADDR:
1680         case SIOCGIFDSTADDR:
1681         case SIOCSIFDSTADDR:
1682         case SIOCGIFBRDADDR:
1683         case SIOCSIFBRDADDR:
1684         case SIOCGIFNETMASK:
1685         case SIOCSIFNETMASK:
1686         case SIOCGIFMETRIC:
1687         case SIOCSIFMETRIC:
1688                 rc = -EINVAL;
1689                 break;
1690         case SIOCADDRT:
1691         case SIOCDELRT:
1692                 rc = -EPERM;
1693                 if (!capable(CAP_NET_ADMIN))
1694                         break;
1695                 rc = x25_route_ioctl(cmd, argp);
1696                 break;
1697         case SIOCX25GSUBSCRIP:
1698                 rc = compat_x25_subscr_ioctl(cmd, argp);
1699                 break;
1700         case SIOCX25SSUBSCRIP:
1701                 rc = -EPERM;
1702                 if (!capable(CAP_NET_ADMIN))
1703                         break;
1704                 rc = compat_x25_subscr_ioctl(cmd, argp);
1705                 break;
1706         case SIOCX25GFACILITIES:
1707         case SIOCX25SFACILITIES:
1708         case SIOCX25GDTEFACILITIES:
1709         case SIOCX25SDTEFACILITIES:
1710         case SIOCX25GCALLUSERDATA:
1711         case SIOCX25SCALLUSERDATA:
1712         case SIOCX25GCAUSEDIAG:
1713         case SIOCX25SCAUSEDIAG:
1714         case SIOCX25SCUDMATCHLEN:
1715         case SIOCX25CALLACCPTAPPRV:
1716         case SIOCX25SENDCALLACCPT:
1717                 rc = x25_ioctl(sock, cmd, (unsigned long)argp);
1718                 break;
1719         default:
1720                 rc = -ENOIOCTLCMD;
1721                 break;
1722         }
1723         return rc;
1724 }
1725 #endif
1726 
1727 static const struct proto_ops x25_proto_ops = {
1728         .family =       AF_X25,
1729         .owner =        THIS_MODULE,
1730         .release =      x25_release,
1731         .bind =         x25_bind,
1732         .connect =      x25_connect,
1733         .socketpair =   sock_no_socketpair,
1734         .accept =       x25_accept,
1735         .getname =      x25_getname,
1736         .poll =         datagram_poll,
1737         .ioctl =        x25_ioctl,
1738 #ifdef CONFIG_COMPAT
1739         .compat_ioctl = compat_x25_ioctl,
1740 #endif
1741         .gettstamp =    sock_gettstamp,
1742         .listen =       x25_listen,
1743         .shutdown =     sock_no_shutdown,
1744         .setsockopt =   x25_setsockopt,
1745         .getsockopt =   x25_getsockopt,
1746         .sendmsg =      x25_sendmsg,
1747         .recvmsg =      x25_recvmsg,
1748         .mmap =         sock_no_mmap,
1749         .sendpage =     sock_no_sendpage,
1750 };
1751 
1752 static struct packet_type x25_packet_type __read_mostly = {
1753         .type = cpu_to_be16(ETH_P_X25),
1754         .func = x25_lapb_receive_frame,
1755 };
1756 
1757 static struct notifier_block x25_dev_notifier = {
1758         .notifier_call = x25_device_event,
1759 };
1760 
1761 void x25_kill_by_neigh(struct x25_neigh *nb)
1762 {
1763         struct sock *s;
1764 
1765         write_lock_bh(&x25_list_lock);
1766 
1767         sk_for_each(s, &x25_list)
1768                 if (x25_sk(s)->neighbour == nb)
1769                         x25_disconnect(s, ENETUNREACH, 0, 0);
1770 
1771         write_unlock_bh(&x25_list_lock);
1772 
1773         /* Remove any related forwards */
1774         x25_clear_forward_by_dev(nb->dev);
1775 }
1776 
1777 static int __init x25_init(void)
1778 {
1779         int rc;
1780 
1781         rc = proto_register(&x25_proto, 0);
1782         if (rc)
1783                 goto out;
1784 
1785         rc = sock_register(&x25_family_ops);
1786         if (rc)
1787                 goto out_proto;
1788 
1789         dev_add_pack(&x25_packet_type);
1790 
1791         rc = register_netdevice_notifier(&x25_dev_notifier);
1792         if (rc)
1793                 goto out_sock;
1794 
1795         rc = x25_register_sysctl();
1796         if (rc)
1797                 goto out_dev;
1798 
1799         rc = x25_proc_init();
1800         if (rc)
1801                 goto out_sysctl;
1802 
1803         pr_info("Linux Version 0.2\n");
1804 
1805 out:
1806         return rc;
1807 out_sysctl:
1808         x25_unregister_sysctl();
1809 out_dev:
1810         unregister_netdevice_notifier(&x25_dev_notifier);
1811 out_sock:
1812         dev_remove_pack(&x25_packet_type);
1813         sock_unregister(AF_X25);
1814 out_proto:
1815         proto_unregister(&x25_proto);
1816         goto out;
1817 }
1818 module_init(x25_init);
1819 
1820 static void __exit x25_exit(void)
1821 {
1822         x25_proc_exit();
1823         x25_link_free();
1824         x25_route_free();
1825 
1826         x25_unregister_sysctl();
1827 
1828         unregister_netdevice_notifier(&x25_dev_notifier);
1829 
1830         dev_remove_pack(&x25_packet_type);
1831 
1832         sock_unregister(AF_X25);
1833         proto_unregister(&x25_proto);
1834 }
1835 module_exit(x25_exit);
1836 
1837 MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
1838 MODULE_DESCRIPTION("The X.25 Packet Layer network layer protocol");
1839 MODULE_LICENSE("GPL");
1840 MODULE_ALIAS_NETPROTO(PF_X25);
/* [<][>][^][v][top][bottom][index][help] */
root/net/x25/af_x25.c

DEFINITIONS
