net/netrom/af_netrom.c

/* */
This source file includes following definitions.
nr_remove_socket
nr_kill_by_device
nr_device_event
nr_insert_socket
nr_find_listener
nr_find_socket
nr_find_peer
nr_destroy_timer
nr_destroy_socket
nr_fcntl
nr_setsockopt
nr_getsockopt
nr_listen
def_callback1
def_callback2
nr_create
nr_make_new
nr_dup
nr_release
nr_bind
nr_connect
nr_socketpair
nr_accept
nr_getname
nr_rx_frame
nr_sendto
nr_send
nr_write
nr_recvfrom
nr_recv
nr_read
nr_shutdown
nr_select
nr_ioctl
nr_get_info
nr_proto_init
   1 /*
   2  *      NET/ROM release 003
   3  *
   4  *      This is ALPHA test software. This code may break your machine, randomly fail to work with new 
   5  *      releases, misbehave and/or generally screw up. It might even work. 
   6  *
   7  *      This code REQUIRES 1.3.0 or higher/ NET3.029
   8  *
   9  *      This module:
  10  *              This module is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  *
  15  *      History
  16  *      NET/ROM 001     Jonathan(G4KLX) Cloned from the AX25 code.
  17  *      NET/ROM 002     Darryl(G7LED)   Fixes and address enhancement.
  18  *                      Jonathan(G4KLX) Complete bind re-think.
  19  *                      Alan(GW4PTS)    Trivial tweaks into new format.
  20  *      NET/ROM 003     Jonathan(G4KLX) Added G8BPQ extensions.
  21  *                                      Added NET/ROM routing ioctl.
  22  *
  23  *      To do:
  24  *              Fix non-blocking connect failure.
  25  */
  26   
  27 #include <linux/config.h>
  28 #ifdef CONFIG_NETROM
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/socket.h>
  32 #include <linux/in.h>
  33 #include <linux/kernel.h>
  34 #include <linux/sched.h>
  35 #include <linux/timer.h>
  36 #include <linux/string.h>
  37 #include <linux/sockios.h>
  38 #include <linux/net.h>
  39 #include <linux/stat.h>
  40 #include <net/ax25.h>
  41 #include <linux/inet.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/skbuff.h>
  45 #include <net/sock.h>
  46 #include <asm/segment.h>
  47 #include <asm/system.h>
  48 #include <linux/fcntl.h>
  49 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  50 #include <linux/mm.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/notifier.h>
  53 #include <net/netrom.h>
  54 #include <linux/proc_fs.h>
  55 #include <net/ip.h>
  56 #include <net/arp.h>
  57 #include <linux/if_arp.h>
  58 #include <linux/proc_fs.h>
  59 
  60 /************************************************************************\
  61 *                                                                       *
  62 *                       Handlers for the socket list                    *
  63 *                                                                       *
  64 \************************************************************************/
  65 
  66 struct nr_parms_struct nr_default;
  67 
  68 static unsigned short circuit = 0x101;
  69 
  70 static struct sock *volatile nr_list = NULL;
  71 
  72 /*
  73  *      Socket removal during an interrupt is now safe.
  74  */
  75 static void nr_remove_socket(struct sock *sk)
     /*  */
  76 {
  77         struct sock *s;
  78         unsigned long flags;
  79         
  80         save_flags(flags);
  81         cli();
  82 
  83         if ((s = nr_list) == sk) {
  84                 nr_list = s->next;
  85                 restore_flags(flags);
  86                 return;
  87         }
  88 
  89         while (s != NULL && s->next != NULL) {
  90                 if (s->next == sk) {
  91                         s->next = sk->next;
  92                         restore_flags(flags);
  93                         return;
  94                 }
  95 
  96                 s = s->next;
  97         }
  98 
  99         restore_flags(flags);
 100 }
 101 
 102 /*
 103  *      Kill all bound sockets on a dropped device.
 104  */
 105 static void nr_kill_by_device(struct device *dev)
     /*  */
 106 {
 107         struct sock *s;
 108         
 109         for (s = nr_list; s != NULL; s = s->next) {
 110                 if (s->nr->device == dev) {
 111                         s->nr->state  = NR_STATE_0;
 112                         s->nr->device = NULL;
 113                         s->state = TCP_CLOSE;
 114                         s->err   = ENETUNREACH;
 115                         s->state_change(s);
 116                         s->dead  = 1;
 117                 }
 118         }
 119 }
 120 
 121 /*
 122  *      Handle device status changes.
 123  */
 124 static int nr_device_event(unsigned long event, void *ptr)
     /*  */
 125 {
 126         struct device *dev = (struct device *)ptr;
 127 
 128         if (event != NETDEV_DOWN)
 129                 return NOTIFY_DONE;
 130                 
 131         nr_kill_by_device(dev);
 132         nr_rt_device_down(dev);
 133         
 134         return NOTIFY_DONE;
 135 }
 136 
 137 /*
 138  *      Add a socket to the bound sockets list.
 139  */
 140 static void nr_insert_socket(struct sock *sk)
     /*  */
 141 {
 142         unsigned long flags;
 143 
 144         save_flags(flags);
 145         cli();
 146 
 147         sk->next = nr_list;
 148         nr_list  = sk;
 149 
 150         restore_flags(flags);
 151 }
 152 
 153 /*
 154  *      Find a socket that wants to accept the Connect Request we just
 155  *      received.
 156  */
 157 static struct sock *nr_find_listener(ax25_address *addr, int type)
     /*  */
 158 {
 159         unsigned long flags;
 160         struct sock *s;
 161 
 162         save_flags(flags);
 163         cli();
 164 
 165         for (s = nr_list; s != NULL; s = s->next) {
 166                 if (ax25cmp(&s->nr->source_addr, addr) == 0 && s->type == type && s->state == TCP_LISTEN) {
 167                         restore_flags(flags);
 168                         return s;
 169                 }
 170         }
 171 
 172         restore_flags(flags);
 173         return NULL;
 174 }
 175 
 176 /*
 177  *      Find a connected NET/ROM socket given my circuit IDs.
 178  */
 179 static struct sock *nr_find_socket(unsigned char index, unsigned char id, int type)
     /*  */
 180 {
 181         struct sock *s;
 182         unsigned long flags;
 183 
 184         save_flags(flags);
 185         cli();
 186 
 187         for (s = nr_list; s != NULL; s = s->next) {
 188                 if (s->nr->my_index == index && s->nr->my_id == id && s->type == type) {
 189                         restore_flags(flags);
 190                         return s;
 191                 }
 192         }
 193 
 194         restore_flags(flags);
 195 
 196         return NULL;
 197 }
 198 
 199 /*
 200  *      Find a connected NET/ROM socket given their circuit IDs.
 201  */
 202 static struct sock *nr_find_peer(unsigned char index, unsigned char id, int type)
     /*  */
 203 {
 204         struct sock *s;
 205         unsigned long flags;
 206 
 207         save_flags(flags);
 208         cli();
 209 
 210         for (s = nr_list; s != NULL; s = s->next) {
 211                 if (s->nr->your_index == index && s->nr->your_id == id && s->type == type) {
 212                         restore_flags(flags);
 213                         return s;
 214                 }
 215         }
 216 
 217         restore_flags(flags);
 218 
 219         return NULL;
 220 }
 221 
 222 /*
 223  *      Deferred destroy.
 224  */
 225 void nr_destory_socket(struct sock *);
 226 
 227 /*
 228  *      Handler for deferred kills.
 229  */
 230 static void nr_destroy_timer(unsigned long data)
     /*  */
 231 {
 232         nr_destroy_socket((struct sock *)data);
 233 }
 234 
 235 /*
 236  *      This is called from user mode and the timers. Thus it protects itself against
 237  *      interrupt users but doesn't worry about being called during work.
 238  *      Once it is removed from the queue no interrupt or bottom half will
 239  *      touch it and we are (fairly 8-) ) safe.
 240  */
 241 void nr_destroy_socket(struct sock *sk) /* Not static as its used by the timer */
     /*  */
 242 {
 243         struct sk_buff *skb;
 244         unsigned long flags;
 245         
 246         save_flags(flags);
 247         cli();
 248         
 249         del_timer(&sk->timer);
 250         
 251         nr_remove_socket(sk);
 252         nr_clear_queues(sk);            /* Flush the queues */
 253         
 254         while ((skb = skb_dequeue(&sk->receive_queue)) != NULL) {
 255                 if (skb->sk != sk) {                    /* A pending connection */
 256                         skb->sk->dead = 1;      /* Queue the unaccepted socket for death */
 257                         nr_set_timer(skb->sk);
 258                         skb->sk->nr->state = NR_STATE_0;
 259                 }
 260 
 261                 kfree_skb(skb, FREE_READ);
 262         }
 263         
 264         if (sk->wmem_alloc || sk->rmem_alloc) { /* Defer: outstanding buffers */
 265                 init_timer(&sk->timer);
 266                 sk->timer.expires  = jiffies + 10 * HZ;
 267                 sk->timer.function = nr_destroy_timer;
 268                 sk->timer.data     = (unsigned long)sk;
 269                 add_timer(&sk->timer);
 270         } else {
 271                 kfree_s(sk->nr, sizeof(*sk->nr));
 272                 kfree_s(sk, sizeof(*sk));
 273         }
 274 
 275         restore_flags(flags);
 276 }
 277 
 278 /*******************************************************************************************************************\
 279 *                                                                                                                   *
 280 * Handling for system calls applied via the various interfaces to a NET/ROM socket object                           *
 281 *                                                                                                                   *
 282 \*******************************************************************************************************************/
 283  
 284 static int nr_fcntl(struct socket *sock, unsigned int cmd, unsigned long arg)
     /*  */
 285 {
 286         switch(cmd)
 287         {
 288                 default:
 289                         return(-EINVAL);
 290         }
 291 }
 292 
 293 static int nr_setsockopt(struct socket *sock, int level, int optname,
     /*  */
 294         char *optval, int optlen)
 295 {
 296         struct sock *sk;
 297         int err, opt;
 298 
 299         sk = (struct sock *)sock->data;
 300         
 301         if (level == SOL_SOCKET)
 302                 return sock_setsockopt(sk, level, optname, optval, optlen);
 303 
 304         if (level != SOL_NETROM)
 305                 return -EOPNOTSUPP;
 306 
 307         if (optval == NULL)
 308                 return -EINVAL;
 309 
 310         if ((err = verify_area(VERIFY_READ, optval, sizeof(int))) != 0)
 311                 return err;
 312 
 313         opt = get_fs_long((unsigned long *)optval);
 314         
 315         switch (optname) {
 316                 case NETROM_T1:
 317                         if (opt < 1)
 318                                 return -EINVAL;
 319                         sk->nr->rtt = (opt * PR_SLOWHZ) / 2;
 320                         return 0;
 321 
 322                 case NETROM_T2:
 323                         if (opt < 1)
 324                                 return -EINVAL;
 325                         sk->nr->t2 = opt * PR_SLOWHZ;
 326                         return 0;
 327                         
 328                 case NETROM_N2:
 329                         if (opt < 1 || opt > 31)
 330                                 return -EINVAL;
 331                         sk->nr->n2 = opt;
 332                         return 0;
 333                         
 334                 case NETROM_HDRINCL:
 335                         sk->nr->hdrincl = opt ? 1 : 0;
 336                         return 0;
 337                         
 338                 default:
 339                         return -ENOPROTOOPT;
 340         }
 341 }
 342 
 343 static int nr_getsockopt(struct socket *sock, int level, int optname,
     /*  */
 344         char *optval, int *optlen)
 345 {
 346         struct sock *sk;
 347         int val = 0;
 348         int err; 
 349 
 350         sk = (struct sock *)sock->data;
 351         
 352         if (level == SOL_SOCKET)
 353                 return sock_getsockopt(sk, level, optname, optval, optlen);
 354         
 355         if (level != SOL_NETROM)
 356                 return -EOPNOTSUPP;
 357         
 358         switch (optname) {
 359                 case NETROM_T1:
 360                         val = (sk->nr->t1 * 2) / PR_SLOWHZ;
 361                         break;
 362                         
 363                 case NETROM_T2:
 364                         val = sk->nr->t2 / PR_SLOWHZ;
 365                         break;
 366                         
 367                 case NETROM_N2:
 368                         val = sk->nr->n2;
 369                         break;
 370                                                 
 371                 case NETROM_HDRINCL:
 372                         val = sk->nr->hdrincl;
 373                         break;
 374 
 375                 default:
 376                         return -ENOPROTOOPT;
 377         }
 378 
 379         if ((err = verify_area(VERIFY_WRITE, optlen, sizeof(int))) != 0)
 380                 return err;
 381 
 382         put_fs_long(sizeof(int), (unsigned long *)optlen);
 383 
 384         if ((err = verify_area(VERIFY_WRITE, optval, sizeof(int))) != 0)
 385                 return err;
 386 
 387         put_fs_long(val, (unsigned long *)optval);
 388 
 389         return 0;
 390 }
 391 
 392 static int nr_listen(struct socket *sock, int backlog)
     /*  */
 393 {
 394         struct sock *sk = (struct sock *)sock->data;
 395 
 396         if (sk->type == SOCK_SEQPACKET && sk->state != TCP_LISTEN) {
 397                 memset(&sk->nr->user_addr, '\0', sizeof(ax25_address));
 398                 sk->max_ack_backlog = backlog;
 399                 sk->state           = TCP_LISTEN;
 400                 return 0;
 401         }
 402 
 403         return -EOPNOTSUPP;
 404 }
 405 
 406 static void def_callback1(struct sock *sk)
     /*  */
 407 {
 408         if (!sk->dead)
 409                 wake_up_interruptible(sk->sleep);
 410 }
 411 
 412 static void def_callback2(struct sock *sk, int len)
     /*  */
 413 {
 414         if (!sk->dead)
 415                 wake_up_interruptible(sk->sleep);
 416 }
 417 
 418 static int nr_create(struct socket *sock, int protocol)
     /*  */
 419 {
 420         struct sock *sk;
 421         nr_cb *nr;
 422 
 423         if ((sk = (struct sock *)kmalloc(sizeof(*sk), GFP_ATOMIC)) == NULL)
 424                 return -ENOMEM;
 425 
 426         if ((nr = (nr_cb *)kmalloc(sizeof(*nr), GFP_ATOMIC)) == NULL) {
 427                 kfree_s(sk, sizeof(*sk));
 428                 return -ENOMEM;
 429         }
 430 
 431         sk->type = sock->type;
 432 
 433         switch (sock->type) {
 434                 case SOCK_SEQPACKET:
 435                         break;
 436                 default:
 437                         kfree_s((void *)sk, sizeof(*sk));
 438                         kfree_s((void *)nr, sizeof(*nr));
 439                         return -ESOCKTNOSUPPORT;
 440         }
 441 
 442         skb_queue_head_init(&sk->receive_queue);
 443         skb_queue_head_init(&sk->write_queue);
 444         skb_queue_head_init(&sk->back_log);
 445 
 446         init_timer(&sk->timer);
 447 
 448         sk->socket        = sock;
 449         sk->protocol      = protocol;
 450         sk->dead          = 0;
 451         sk->next          = NULL;
 452         sk->broadcast     = 0;
 453         sk->rcvbuf        = SK_RMEM_MAX;
 454         sk->sndbuf        = SK_WMEM_MAX;
 455         sk->wmem_alloc    = 0;
 456         sk->rmem_alloc    = 0;
 457         sk->inuse         = 0;
 458         sk->debug         = 0;
 459         sk->prot          = NULL;       /* So we use default free mechanisms */
 460         sk->err           = 0;
 461         sk->localroute    = 0;
 462         sk->send_head     = NULL;
 463         sk->state         = TCP_CLOSE;
 464         sk->shutdown      = 0;
 465         sk->priority      = SOPRI_NORMAL;
 466         sk->ack_backlog   = 0;
 467         sk->mtu           = NETROM_MTU; /* 236 */
 468         sk->zapped        = 1;
 469         sk->window        = nr_default.window;
 470 
 471         sk->state_change = def_callback1;
 472         sk->data_ready   = def_callback2;
 473         sk->write_space  = def_callback1;
 474         sk->error_report = def_callback1;
 475 
 476         if (sock != NULL) {
 477                 sock->data = (void *)sk;
 478                 sk->sleep  = sock->wait;
 479         }
 480 
 481         skb_queue_head_init(&nr->ack_queue);
 482         skb_queue_head_init(&nr->reseq_queue);
 483         skb_queue_head_init(&nr->frag_queue);
 484 
 485         nr->my_index = 0;
 486         nr->my_id    = 0;
 487         nr->rtt      = nr_default.timeout;
 488         nr->t1       = nr_default.timeout;
 489         nr->t2       = nr_default.ack_delay;
 490         nr->n2       = nr_default.tries;
 491 
 492         nr->t1timer  = 0;
 493         nr->t2timer  = 0;
 494         nr->t4timer  = 0;
 495         nr->n2count  = 0;
 496 
 497         nr->va       = 0;
 498         nr->vr       = 0;
 499         nr->vs       = 0;
 500         nr->vl       = 0;
 501 
 502         nr->your_index = 0;
 503         nr->your_id    = 0;
 504 
 505         nr->my_index   = 0;
 506         nr->my_id      = 0;
 507 
 508         nr->bpqext     = 1;
 509         nr->fraglen    = 0;
 510         nr->hdrincl    = 0;
 511         nr->state      = NR_STATE_0;
 512         nr->device     = NULL;
 513 
 514         memset(&nr->source_addr, '\0', sizeof(ax25_address));
 515         memset(&nr->user_addr,   '\0', sizeof(ax25_address));
 516         memset(&nr->dest_addr,   '\0', sizeof(ax25_address));
 517 
 518         nr->sk = sk;
 519         sk->nr = nr;
 520 
 521         return 0;
 522 }
 523 
 524 static struct sock *nr_make_new(struct sock *osk)
     /*  */
 525 {
 526         struct sock *sk;
 527         nr_cb *nr;
 528 
 529         if ((sk = (struct sock *)kmalloc(sizeof(*sk), GFP_ATOMIC)) == NULL)
 530                 return NULL;
 531 
 532         if ((nr = (nr_cb *)kmalloc(sizeof(*nr), GFP_ATOMIC)) == NULL) {
 533                 kfree_s(sk, sizeof(*sk));
 534                 return NULL;
 535         }
 536 
 537         sk->type   = osk->type;
 538         sk->socket = osk->socket;
 539 
 540         switch (osk->type) {
 541                 case SOCK_SEQPACKET:
 542                         break;
 543                 default:
 544                         kfree_s((void *)sk, sizeof(*sk));
 545                         kfree_s((void *)nr, sizeof(*nr));
 546                         return NULL;
 547         }
 548 
 549         skb_queue_head_init(&sk->receive_queue);
 550         skb_queue_head_init(&sk->write_queue);
 551         skb_queue_head_init(&sk->back_log);
 552 
 553         init_timer(&sk->timer);
 554 
 555         sk->dead        = 0;
 556         sk->next        = NULL;
 557         sk->priority    = osk->priority;
 558         sk->broadcast   = 0;
 559         sk->protocol    = osk->protocol;
 560         sk->rcvbuf      = osk->rcvbuf;
 561         sk->sndbuf      = osk->sndbuf;
 562         sk->wmem_alloc  = 0;
 563         sk->rmem_alloc  = 0;
 564         sk->inuse       = 0;
 565         sk->ack_backlog = 0;
 566         sk->prot        = NULL; /* So we use default free mechanisms */
 567         sk->err         = 0;
 568         sk->localroute  = 0;
 569         sk->send_head   = NULL;
 570         sk->debug       = osk->debug;
 571         sk->state       = TCP_ESTABLISHED;
 572         sk->window      = osk->window;
 573         sk->shutdown    = 0;
 574         sk->mtu         = osk->mtu;
 575         sk->sleep       = osk->sleep;
 576         sk->zapped      = osk->zapped;
 577 
 578         sk->state_change = def_callback1;
 579         sk->data_ready   = def_callback2;
 580         sk->write_space  = def_callback1;
 581         sk->error_report = def_callback1;
 582 
 583         skb_queue_head_init(&nr->ack_queue);
 584         skb_queue_head_init(&nr->reseq_queue);
 585         skb_queue_head_init(&nr->frag_queue);
 586 
 587         nr->rtt      = osk->nr->rtt;
 588         nr->t1       = osk->nr->t1;
 589         nr->t2       = osk->nr->t2;
 590         nr->n2       = osk->nr->n2;
 591 
 592         nr->device   = osk->nr->device;
 593         nr->bpqext   = osk->nr->bpqext;
 594         nr->hdrincl  = osk->nr->hdrincl;
 595         nr->fraglen  = 0;
 596 
 597         nr->t1timer  = 0;
 598         nr->t2timer  = 0;
 599         nr->t4timer  = 0;
 600         nr->n2count  = 0;
 601 
 602         nr->va       = 0;
 603         nr->vr       = 0;
 604         nr->vs       = 0;
 605         nr->vl       = 0;
 606         
 607         sk->nr = nr;
 608         nr->sk = sk;
 609 
 610         return sk;
 611 }
 612 
 613 static int nr_dup(struct socket *newsock, struct socket *oldsock)
     /*  */
 614 {
 615         struct sock *sk = (struct sock *)oldsock->data;
 616 
 617         return nr_create(newsock, sk->protocol);
 618 }
 619 
 620 static int nr_release(struct socket *sock, struct socket *peer)
     /*  */
 621 {
 622         struct sock *sk = (struct sock *)sock->data;
 623 
 624         if (sk == NULL) return 0;
 625 
 626         if (sk->type == SOCK_SEQPACKET) {
 627                 switch (sk->nr->state) {
 628                         case NR_STATE_0:
 629                                 sk->dead      = 1;
 630                                 sk->state_change(sk);
 631                                 nr_destroy_socket(sk);
 632                                 break;
 633 
 634                         case NR_STATE_1:
 635                                 sk->nr->state = NR_STATE_0;
 636                                 sk->dead      = 1;
 637                                 sk->state_change(sk);
 638                                 nr_destroy_socket(sk);
 639                                 break;
 640 
 641                         case NR_STATE_2:
 642                                 nr_write_internal(sk, NR_DISCACK);
 643                                 sk->nr->state = NR_STATE_0;
 644                                 sk->dead      = 1;
 645                                 sk->state_change(sk);
 646                                 nr_destroy_socket(sk);
 647                                 break;                  
 648 
 649                         case NR_STATE_3:
 650                                 nr_clear_queues(sk);
 651                                 sk->nr->n2count = 0;
 652                                 nr_write_internal(sk, NR_DISCREQ);
 653                                 sk->nr->t1timer = sk->nr->t1 = nr_calculate_t1(sk);
 654                                 sk->nr->t2timer = 0;
 655                                 sk->nr->t4timer = 0;
 656                                 sk->nr->state   = NR_STATE_2;
 657                                 sk->state_change(sk);
 658                                 sk->dead        = 1;
 659                                 break;
 660 
 661                         default:
 662                                 break;
 663                 }
 664         } else {
 665                 sk->dead = 1;
 666                 sk->state_change(sk);
 667                 nr_destroy_socket(sk);
 668         }
 669 
 670         sock->data = NULL;      
 671 
 672         return 0;
 673 }
 674 
 675 static int nr_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
     /*  */
 676 {
 677         struct sock *sk;
 678         struct full_sockaddr_ax25 *addr = (struct full_sockaddr_ax25 *)uaddr;
 679         struct device *dev;
 680         ax25_address *user, *source;
 681         
 682         sk = (struct sock *)sock->data;
 683 
 684         if (sk->zapped == 0)
 685                 return -EIO;
 686                 
 687         if (addr_len != sizeof(struct sockaddr_ax25) && addr_len != sizeof(struct full_sockaddr_ax25))
 688                 return -EINVAL;
 689 
 690 #ifdef DONTDO
 691         if (nr_find_listener(&addr->fsa_ax25.sax25_call, sk->type) != NULL) {
 692                 if (sk->debug)
 693                         printk("NET/ROM: bind failed: in use\n");
 694                 return -EADDRINUSE;
 695         }
 696 #endif
 697 
 698         if ((dev = nr_dev_get(&addr->fsa_ax25.sax25_call)) == NULL) {
 699                 if (sk->debug)
 700                         printk("NET/ROM: bind failed: invalid node callsign\n");
 701                 return -EADDRNOTAVAIL;
 702         }
 703 
 704         /*
 705          * Only the super user can set an arbitrary user callsign.
 706          */
 707         if (addr->fsa_ax25.sax25_ndigis == 1) {
 708                 if (!suser())
 709                         return -EPERM;
 710                 memcpy(&sk->nr->user_addr,   &addr->fsa_digipeater[0],   sizeof(ax25_address));
 711                 memcpy(&sk->nr->source_addr, &addr->fsa_ax25.sax25_call, sizeof(ax25_address));
 712         } else {
 713                 source = &addr->fsa_ax25.sax25_call;
 714 
 715                 if ((user = ax25_findbyuid(current->euid)) == NULL) {
 716                         if (ax25_uid_policy && !suser())
 717                                 return -EPERM;
 718                         user = source;
 719                 }
 720 
 721                 memcpy(&sk->nr->user_addr,   user,   sizeof(ax25_address));
 722                 memcpy(&sk->nr->source_addr, source, sizeof(ax25_address));
 723         }
 724 
 725         sk->nr->device = dev;
 726         nr_insert_socket(sk);
 727 
 728         sk->zapped = 0;
 729 
 730         if (sk->debug)
 731                 printk("NET/ROM: socket is bound\n");
 732 
 733         return 0;
 734 }
 735 
 736 static int nr_connect(struct socket *sock, struct sockaddr *uaddr,
     /*  */
 737         int addr_len, int flags)
 738 {
 739         struct sock *sk = (struct sock *)sock->data;
 740         struct sockaddr_ax25 *addr = (struct sockaddr_ax25 *)uaddr;
 741         ax25_address *user, *source = NULL;
 742         struct device *dev;
 743         
 744         if (sk->state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
 745                 sock->state = SS_CONNECTED;
 746                 return 0;       /* Connect completed during a ERESTARTSYS event */
 747         }
 748         
 749         if (sk->state == TCP_CLOSE && sock->state == SS_CONNECTING) {
 750                 sock->state = SS_UNCONNECTED;
 751                 return -ECONNREFUSED;
 752         }
 753         
 754         if (sk->state == TCP_ESTABLISHED && sk->type == SOCK_SEQPACKET)
 755                 return -EISCONN;        /* No reconnect on a seqpacket socket */
 756                 
 757         sk->state   = TCP_CLOSE;        
 758         sock->state = SS_UNCONNECTED;
 759 
 760         if (addr_len != sizeof(struct sockaddr_ax25))
 761                 return -EINVAL;
 762 
 763         if ((dev = nr_dev_first()) == NULL)
 764                 return -ENETUNREACH;
 765                 
 766         if (sk->zapped) {       /* Must bind first - autobinding in this may or may not work */
 767                 sk->zapped = 0;
 768 
 769                 source = (ax25_address *)dev->dev_addr;
 770 
 771                 if ((user = ax25_findbyuid(current->euid)) == NULL) {
 772                         if (ax25_uid_policy && !suser())
 773                                 return -EPERM;
 774                         user = source;
 775                 }
 776 
 777                 memcpy(&sk->nr->user_addr,   user,   sizeof(ax25_address));
 778                 memcpy(&sk->nr->source_addr, source, sizeof(ax25_address));
 779 
 780                 nr_insert_socket(sk);           /* Finish the bind */
 781         }
 782                 
 783         memcpy(&sk->nr->dest_addr, &addr->sax25_call, sizeof(ax25_address));
 784 
 785         sk->nr->my_index = circuit / 256;
 786         sk->nr->my_id    = circuit % 256;
 787 
 788         circuit++;
 789         
 790         /* Move to connecting socket, start sending Connect Requests */
 791         sock->state   = SS_CONNECTING;
 792         sk->state     = TCP_SYN_SENT;
 793         nr_establish_data_link(sk);
 794         sk->nr->state = NR_STATE_1;
 795         nr_set_timer(sk);
 796         
 797         /* Now the loop */
 798         if (sk->state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
 799                 return -EINPROGRESS;
 800                 
 801         cli();  /* To avoid races on the sleep */
 802 
 803         /*
 804          * A Connect Ack with Choke or timeout or failed routing will go to closed.
 805          */
 806         while (sk->state == TCP_SYN_SENT) {
 807                 interruptible_sleep_on(sk->sleep);
 808                 if (current->signal & ~current->blocked) {
 809                         sti();
 810                         return -ERESTARTSYS;
 811                 }
 812         }
 813 
 814         if (sk->state != TCP_ESTABLISHED) {
 815                 sti();
 816                 sock->state = SS_UNCONNECTED;
 817                 return -sk->err;        /* Always set at this point */
 818         }
 819         
 820         sock->state = SS_CONNECTED;
 821 
 822         sti();
 823         
 824         return 0;
 825 }
 826         
 827 static int nr_socketpair(struct socket *sock1, struct socket *sock2)
     /*  */
 828 {
 829         return -EOPNOTSUPP;
 830 }
 831 
 832 static int nr_accept(struct socket *sock, struct socket *newsock, int flags)
     /*  */
 833 {
 834         struct sock *sk;
 835         struct sock *newsk;
 836         struct sk_buff *skb;
 837 
 838         if (newsock->data)
 839                 kfree_s(newsock->data, sizeof(struct sock));
 840 
 841         newsock->data = NULL;
 842         
 843         sk = (struct sock *)sock->data;
 844 
 845         if (sk->type != SOCK_SEQPACKET)
 846                 return -EOPNOTSUPP;
 847         
 848         if (sk->state != TCP_LISTEN)
 849                 return -EINVAL;
 850                 
 851         /* The write queue this time is holding sockets ready to use
 852            hooked into the SABM we saved */
 853         do {
 854                 cli();
 855                 if ((skb = skb_dequeue(&sk->receive_queue)) == NULL) {
 856                         if (flags & O_NONBLOCK) {
 857                                 sti();
 858                                 return 0;
 859                         }
 860                         interruptible_sleep_on(sk->sleep);
 861                         if (current->signal & ~current->blocked) {
 862                                 sti();
 863                                 return -ERESTARTSYS;
 864                         }
 865                 }
 866         } while (skb == NULL);
 867 
 868         newsk = skb->sk;
 869         newsk->pair = NULL;
 870         sti();
 871 
 872         /* Now attach up the new socket */
 873         skb->sk = NULL;
 874         kfree_skb(skb, FREE_READ);
 875         sk->ack_backlog--;
 876         newsock->data = newsk;
 877 
 878         return 0;
 879 }
 880 
 881 static int nr_getname(struct socket *sock, struct sockaddr *uaddr,
     /*  */
 882         int *uaddr_len, int peer)
 883 {
 884         struct full_sockaddr_ax25 *sax = (struct full_sockaddr_ax25 *)uaddr;
 885         struct sock *sk;
 886         
 887         sk = (struct sock *)sock->data;
 888         
 889         if (peer != 0) {
 890                 if (sk->state != TCP_ESTABLISHED)
 891                         return -ENOTCONN;
 892                 sax->fsa_ax25.sax25_family = AF_NETROM;
 893                 sax->fsa_ax25.sax25_ndigis = 1;
 894                 memcpy(&sax->fsa_ax25.sax25_call, &sk->nr->user_addr, sizeof(ax25_address));
 895                 memcpy(&sax->fsa_digipeater[0],   &sk->nr->dest_addr, sizeof(ax25_address));
 896                 *uaddr_len = sizeof(struct sockaddr_ax25) + sizeof(ax25_address);
 897         } else {
 898                 sax->fsa_ax25.sax25_family = AF_NETROM;
 899                 sax->fsa_ax25.sax25_ndigis = 0;
 900                 memcpy(&sax->fsa_ax25.sax25_call, &sk->nr->source_addr, sizeof(ax25_address));
 901                 *uaddr_len = sizeof(struct sockaddr_ax25);
 902         }
 903 
 904         return 0;
 905 }
 906  
 907 int nr_rx_frame(struct sk_buff *skb, struct device *dev)
     /*  */
 908 {
 909         struct sock *sk;
 910         struct sock *make;      
 911         ax25_address *src, *dest, *user;
 912         unsigned short circuit_index, circuit_id;
 913         unsigned short frametype, window, timeout;
 914 
 915         skb->sk = NULL;         /* Initially we don't know who its for */
 916 
 917         /*
 918          *      skb->data points to the netrom frame start
 919          */
 920         
 921         src  = (ax25_address *)(skb->data + 0);
 922         dest = (ax25_address *)(skb->data + 7);
 923 
 924         circuit_index = skb->data[15];
 925         circuit_id    = skb->data[16];
 926         frametype     = skb->data[19];
 927 
 928 #ifdef CONFIG_INET
 929         /*
 930          * Check for an incoming IP over NET/ROM frame.
 931          */
 932          if ((frametype & 0x0F) == NR_PROTOEXT && circuit_index == NR_PROTO_IP && circuit_id == NR_PROTO_IP) {
 933                 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
 934                 skb->h.raw = skb->data;
 935 
 936                 return nr_rx_ip(skb, dev);
 937          }
 938 #endif
 939 
 940         /*
 941          * Find an existing socket connection, based on circuit ID, if its
 942          * a Connect Request base it on their circuit ID.
 943          */
 944         if (((frametype & 0x0F) != NR_CONNREQ && (sk = nr_find_socket(circuit_index, circuit_id, SOCK_SEQPACKET)) != NULL) ||
 945             ((frametype & 0x0F) == NR_CONNREQ && (sk = nr_find_peer(circuit_index, circuit_id, SOCK_SEQPACKET)) != NULL)) {
 946                 skb->h.raw = skb->data;
 947 
 948                 if ((frametype & 0x0F) == NR_CONNACK && skb->len == 22)
 949                         sk->nr->bpqext = 1;
 950                 else
 951                         sk->nr->bpqext = 0;
 952 
 953                 return nr_process_rx_frame(sk, skb);
 954         }
 955 
 956         if ((frametype & 0x0F) != NR_CONNREQ)
 957                 return 0;
 958                 
 959         sk = nr_find_listener(dest, SOCK_SEQPACKET);
 960 
 961         if (sk == NULL || sk->ack_backlog == sk->max_ack_backlog || (make = nr_make_new(sk)) == NULL) {
 962                 nr_transmit_dm(skb);
 963                 return 0;
 964         }
 965 
 966         user   = (ax25_address *)(skb->data + 21);
 967         window = skb->data[20];
 968 
 969         skb->sk             = make;
 970         make->state         = TCP_ESTABLISHED;
 971 
 972         /* Fill in his circuit details */
 973         memcpy(&make->nr->source_addr, dest, sizeof(ax25_address));
 974         memcpy(&make->nr->dest_addr,   src,  sizeof(ax25_address));
 975         memcpy(&make->nr->user_addr,   user, sizeof(ax25_address));
 976                 
 977         make->nr->your_index = circuit_index;
 978         make->nr->your_id    = circuit_id;
 979 
 980         make->nr->my_index   = circuit / 256;
 981         make->nr->my_id      = circuit % 256;
 982         
 983         circuit++;
 984 
 985         /* Window negotiation */
 986         if (window < make->window)
 987                 make->window = window;
 988 
 989         /* L4 timeout negotiation */
 990         if (skb->len == 37) {
 991                 timeout = skb->data[36] * 256 + skb->data[35];
 992                 if (timeout * PR_SLOWHZ < make->nr->rtt * 2)
 993                         make->nr->rtt = (timeout * PR_SLOWHZ) / 2;
 994                 make->nr->bpqext = 1;
 995         } else {
 996                 make->nr->bpqext = 0;
 997         }
 998 
 999         nr_write_internal(make, NR_CONNACK);
1000 
1001         make->nr->condition = 0x00;
1002         make->nr->vs        = 0;
1003         make->nr->va        = 0;
1004         make->nr->vr        = 0;
1005         make->nr->vl        = 0;
1006         make->nr->state     = NR_STATE_3;
1007         sk->ack_backlog++;
1008         make->pair = sk;
1009 
1010         nr_insert_socket(make);
1011 
1012         skb_queue_head(&sk->receive_queue, skb);
1013 
1014         nr_set_timer(make);
1015 
1016         if (!sk->dead)
1017                 sk->data_ready(sk, skb->len);
1018 
1019         return 1;
1020 }
1021 
1022 static int nr_sendto(struct socket *sock, const void *ubuf, int len, int noblock,
     /*  */
1023         unsigned flags, struct sockaddr *usip, int addr_len)
1024 {
1025         struct sock *sk = (struct sock *)sock->data;
1026         struct sockaddr_ax25 *usax = (struct sockaddr_ax25 *)usip;
1027         int err;
1028         struct sockaddr_ax25 sax;
1029         struct sk_buff *skb;
1030         unsigned char *asmptr;
1031         int size;
1032         
1033         if (sk->err) {
1034                 err     = sk->err;
1035                 sk->err = 0;
1036                 return -err;
1037         }
1038 
1039         if (flags)
1040                 return -EINVAL;
1041 
1042         if (sk->zapped)
1043                 return -EADDRNOTAVAIL;
1044 
1045         if (sk->nr->device == NULL)
1046                 return -ENETUNREACH;
1047                 
1048         if (usax) {
1049                 if (addr_len < sizeof(sax))
1050                         return -EINVAL;
1051                 memcpy(&sax, usax, sizeof(sax));
1052                 if (sk->type == SOCK_SEQPACKET && memcmp(&sk->nr->dest_addr, &sax.sax25_call, sizeof(ax25_address)) != 0)
1053                         return -EISCONN;
1054                 if (sax.sax25_family != AF_NETROM)
1055                         return -EINVAL;
1056         } else {
1057                 if (sk->state != TCP_ESTABLISHED)
1058                         return -ENOTCONN;
1059                 sax.sax25_family = AF_NETROM;
1060                 memcpy(&sax.sax25_call, &sk->nr->dest_addr, sizeof(ax25_address));
1061         }
1062         
1063         if (sk->debug)
1064                 printk("NET/ROM: sendto: Addresses built.\n");
1065 
1066         /* Build a packet */
1067         if (sk->debug)
1068                 printk("NET/ROM: sendto: building packet.\n");
1069 
1070         size = len + AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 3 + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
1071 
1072         if ((skb = sock_alloc_send_skb(sk, size, 0, &err)) == NULL)
1073                 return err;
1074 
1075         skb->sk   = sk;
1076         skb->free = 1;
1077         skb->arp  = 1;
1078 
1079         skb_reserve(skb, size - len);
1080         
1081         /*
1082          *      Push down the NET/ROM header
1083          */
1084 
1085         asmptr = skb_push(skb, NR_TRANSPORT_LEN);
1086 
1087         if (sk->debug)
1088                 printk("Building NET/ROM Header.\n");
1089 
1090         /* Build a NET/ROM Transport header */
1091 
1092         *asmptr++ = sk->nr->your_index;
1093         *asmptr++ = sk->nr->your_id;
1094         *asmptr++ = 0;          /* To be filled in later */
1095         *asmptr++ = 0;          /*      Ditto            */
1096         *asmptr++ = NR_INFO;
1097         
1098         if (sk->debug)
1099                 printk("Built header.\n");
1100 
1101         /*
1102          *      Put the data on the end
1103          */
1104 
1105         skb->h.raw = skb_put(skb, len);
1106 
1107         asmptr = skb->h.raw;
1108         
1109         if (sk->debug)
1110                 printk("NET/ROM: Appending user data\n");
1111 
1112         /* User data follows immediately after the NET/ROM transport header */
1113         memcpy_fromfs(asmptr, ubuf, len);
1114 
1115         if (sk->debug)
1116                 printk("NET/ROM: Transmitting buffer\n");
1117 
1118         if (sk->state != TCP_ESTABLISHED) {
1119                 kfree_skb(skb, FREE_WRITE);
1120                 return -ENOTCONN;
1121         }
1122 
1123         nr_output(sk, skb);     /* Shove it onto the queue */
1124 
1125         return len;
1126 }
1127 
1128 static int nr_send(struct socket *sock, const void *ubuf, int size, int noblock, unsigned flags)
     /*  */
1129 {
1130         return nr_sendto(sock, ubuf, size, noblock, flags, NULL, 0);
1131 }
1132 
1133 static int nr_write(struct socket *sock, const char *ubuf, int size, int noblock)
     /*  */
1134 {
1135         return nr_send(sock, ubuf, size, noblock, 0);
1136 }
1137 
1138 static int nr_recvfrom(struct socket *sock, void *ubuf, int size, int noblock,
     /*  */
1139                    unsigned flags, struct sockaddr *sip, int *addr_len)
1140 {
1141         struct sock *sk = (struct sock *)sock->data;
1142         struct sockaddr_ax25 *sax = (struct sockaddr_ax25 *)sip;
1143         int copied;
1144         struct sk_buff *skb;
1145         int er;
1146 
1147         if (sk->err) {
1148                 er      = -sk->err;
1149                 sk->err = 0;
1150                 return er;
1151         }
1152         
1153         if (addr_len != NULL)
1154                 *addr_len = sizeof(*sax);
1155 
1156         /*
1157          * This works for seqpacket too. The receiver has ordered the queue for
1158          * us! We do one quick check first though
1159          */
1160         if (sk->type == SOCK_SEQPACKET && sk->state != TCP_ESTABLISHED)
1161                 return -ENOTCONN;
1162 
1163         /* Now we can treat all alike */
1164         if ((skb = skb_recv_datagram(sk, flags, noblock, &er)) == NULL)
1165                 return er;
1166 
1167         if (!sk->nr->hdrincl) {
1168                 skb_pull(skb, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
1169                 skb->h.raw = skb->data;
1170         }
1171 
1172         copied = (size < skb->len) ? size : skb->len;
1173         skb_copy_datagram(skb, 0, ubuf, copied);
1174         
1175         if (sax != NULL) {
1176                 struct sockaddr_ax25 addr;
1177                 
1178                 addr.sax25_family = AF_NETROM;
1179                 memcpy(&addr.sax25_call, skb->data + 7, sizeof(ax25_address));
1180 
1181                 memcpy(sax, &addr, sizeof(*sax));
1182 
1183                 *addr_len = sizeof(*sax);
1184         }
1185 
1186         skb_free_datagram(skb);
1187 
1188         return copied;
1189 }               
1190 
1191 static int nr_recv(struct socket *sock, void *ubuf, int size , int noblock,
     /*  */
1192         unsigned flags)
1193 {
1194         struct sock *sk = (struct sock *)sock->data;
1195 
1196         if (sk->zapped)
1197                 return -ENOTCONN;
1198 
1199         return nr_recvfrom(sock, ubuf, size, noblock, flags, NULL, NULL);
1200 }
1201 
1202 static int nr_read(struct socket *sock, char *ubuf, int size, int noblock)
     /*  */
1203 {
1204         return nr_recv(sock, ubuf, size, noblock, 0);
1205 }
1206 
1207 static int nr_shutdown(struct socket *sk, int how)
     /*  */
1208 {
1209         return -EOPNOTSUPP;
1210 }
1211 
1212 static int nr_select(struct socket *sock , int sel_type, select_table *wait)
     /*  */
1213 {
1214         struct sock *sk = (struct sock *)sock->data;
1215 
1216         return datagram_select(sk, sel_type, wait);
1217 }
1218 
1219 static int nr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
     /*  */
1220 {
1221         struct sock *sk = (struct sock *)sock->data;
1222         int err;
1223         long amount = 0;
1224 
1225         switch (cmd) {
1226                 case TIOCOUTQ:
1227                         if ((err = verify_area(VERIFY_WRITE, (void *)arg, sizeof(unsigned long))) != 0)
1228                                 return err;
1229                         amount = sk->sndbuf - sk->wmem_alloc;
1230                         if (amount < 0)
1231                                 amount = 0;
1232                         put_fs_long(amount, (unsigned long *)arg);
1233                         return 0;
1234 
1235                 case TIOCINQ:
1236                 {
1237                         struct sk_buff *skb;
1238                         /* These two are safe on a single CPU system as only user tasks fiddle here */
1239                         if ((skb = skb_peek(&sk->receive_queue)) != NULL)
1240                                 amount = skb->len - 20;
1241                         if ((err = verify_area(VERIFY_WRITE, (void *)arg, sizeof(unsigned long))) != 0)
1242                                 return err;
1243                         put_fs_long(amount, (unsigned long *)arg);
1244                         return 0;
1245                 }
1246 
1247                 case SIOCGSTAMP:
1248                         if (sk != NULL) {
1249                                 if (sk->stamp.tv_sec==0)
1250                                         return -ENOENT;
1251                                 if ((err = verify_area(VERIFY_WRITE,(void *)arg,sizeof(struct timeval))) != 0)
1252                                         return err;
1253                                 memcpy_tofs((void *)arg, &sk->stamp, sizeof(struct timeval));
1254                                 return 0;
1255                         }
1256                         return -EINVAL;
1257 
1258                 case SIOCGIFADDR:
1259                 case SIOCSIFADDR:
1260                 case SIOCGIFDSTADDR:
1261                 case SIOCSIFDSTADDR:
1262                 case SIOCGIFBRDADDR:
1263                 case SIOCSIFBRDADDR:
1264                 case SIOCGIFNETMASK:
1265                 case SIOCSIFNETMASK:
1266                 case SIOCGIFMETRIC:
1267                 case SIOCSIFMETRIC:
1268                         return -EINVAL;
1269 
1270                 case SIOCADDRT:
1271                 case SIOCDELRT:
1272                 case SIOCNRDECOBS:
1273                 case SIOCNRRTCTL:
1274                         if (!suser()) return -EPERM;
1275                         return nr_rt_ioctl(cmd, (void *)arg);
1276 
1277                 case SIOCNRGETPARMS:
1278                 {
1279                         struct nr_parms_struct nr_parms;
1280                         if ((err = verify_area(VERIFY_WRITE, (void *)arg, sizeof(struct nr_parms_struct))) != 0)
1281                                 return err;
1282                         memcpy_fromfs(&nr_parms, (void *)arg, sizeof(struct nr_parms_struct));
1283                         nr_parms = nr_default;
1284                         memcpy_tofs((void *)arg, &nr_parms, sizeof(struct nr_parms_struct));
1285                         return 0;
1286                 }
1287 
1288                 case SIOCNRSETPARMS:
1289                 {
1290                         struct nr_parms_struct nr_parms;
1291                         if (!suser()) return -EPERM;
1292                         if ((err = verify_area(VERIFY_READ, (void *)arg, sizeof(struct nr_parms_struct))) != 0)
1293                                 return err;
1294                         memcpy_fromfs(&nr_parms, (void *)arg, sizeof(struct nr_parms_struct));
1295                         nr_default = nr_parms;
1296                         return 0;
1297                 }
1298                 
1299                 default:
1300                         return dev_ioctl(cmd, (void *)arg);
1301         }
1302 
1303         /*NOTREACHED*/
1304         return(0);
1305 }
1306 
1307 static int nr_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
     /*  */
1308 {
1309         struct sock *s;
1310         struct device *dev;
1311         const char *devname;
1312         int len = 0;
1313         off_t pos = 0;
1314         off_t begin = 0;
1315   
1316         cli();
1317 
1318         len += sprintf(buffer, "user_addr dest_node src_node  dev    my  your  st vs vr va    t1     t2    n2  rtt wnd Snd-Q Rcv-Q\n");
1319 
1320         for (s = nr_list; s != NULL; s = s->next) {
1321                 if ((dev = s->nr->device) == NULL)
1322                         devname = "???";
1323                 else
1324                         devname = dev->name;
1325         
1326                 len += sprintf(buffer + len, "%-9s ",
1327                         ax2asc(&s->nr->user_addr));
1328                 len += sprintf(buffer + len, "%-9s ",
1329                         ax2asc(&s->nr->dest_addr));
1330                 len += sprintf(buffer + len, "%-9s %-3s  %02X/%02X %02X/%02X %2d %2d %2d %2d %3d/%03d %2d/%02d %2d/%02d %3d %3d %5ld %5ld\n",
1331                         ax2asc(&s->nr->source_addr),
1332                         devname, s->nr->my_index, s->nr->my_id,
1333                         s->nr->your_index, s->nr->your_id,
1334                         s->nr->state,
1335                         s->nr->vs, s->nr->vr, s->nr->va,
1336                         s->nr->t1timer / PR_SLOWHZ,
1337                         s->nr->t1      / PR_SLOWHZ,
1338                         s->nr->t2timer / PR_SLOWHZ,
1339                         s->nr->t2      / PR_SLOWHZ,
1340                         s->nr->n2count, s->nr->n2,
1341                         s->nr->rtt     / PR_SLOWHZ,
1342                         s->window,
1343                         s->wmem_alloc, s->rmem_alloc);
1344                 
1345                 pos = begin + len;
1346 
1347                 if (pos < offset) {
1348                         len   = 0;
1349                         begin = pos;
1350                 }
1351                 
1352                 if (pos > offset + length)
1353                         break;
1354         }
1355 
1356         sti();
1357 
1358         *start = buffer + (offset - begin);
1359         len   -= (offset - begin);
1360 
1361         if (len > length) len = length;
1362 
1363         return(len);
1364 } 
1365 
1366 static struct proto_ops nr_proto_ops = {
1367         AF_NETROM,
1368         
1369         nr_create,
1370         nr_dup,
1371         nr_release,
1372         nr_bind,
1373         nr_connect,
1374         nr_socketpair,
1375         nr_accept,
1376         nr_getname,
1377         nr_read,
1378         nr_write,
1379         nr_select,
1380         nr_ioctl,
1381         nr_listen,
1382         nr_send,
1383         nr_recv,
1384         nr_sendto,
1385         nr_recvfrom,
1386         nr_shutdown,
1387         nr_setsockopt,
1388         nr_getsockopt,
1389         nr_fcntl,
1390 };
1391 
1392 static struct notifier_block nr_dev_notifier = {
1393         nr_device_event,
1394         0
1395 };
1396 
1397 void nr_proto_init(struct net_proto *pro)
     /*  */
1398 {
1399         sock_register(nr_proto_ops.family, &nr_proto_ops);
1400         register_netdevice_notifier(&nr_dev_notifier);
1401         printk("G4KLX NET/ROM for Linux. Version 0.3 ALPHA for AX25 030 Linux 1.3.0\n");
1402 
1403         nr_default.quality    = NR_DEFAULT_QUAL;
1404         nr_default.obs_count  = NR_DEFAULT_OBS;
1405         nr_default.ttl        = NR_DEFAULT_TTL;
1406         nr_default.timeout    = NR_DEFAULT_T1;
1407         nr_default.ack_delay  = NR_DEFAULT_T2;
1408         nr_default.busy_delay = NR_DEFAULT_T4;
1409         nr_default.tries      = NR_DEFAULT_N2;
1410         nr_default.window     = NR_DEFAULT_WINDOW;
1411 
1412         proc_net_register(&(struct proc_dir_entry) {
1413                 PROC_NET_NR, 2, "nr",
1414                 S_IFREG | S_IRUGO, 1, 0, 0,
1415                 0, &proc_net_inode_operations, 
1416                 nr_get_info
1417         });
1418         proc_net_register(&(struct proc_dir_entry) {
1419                 PROC_NET_NR_NEIGH, 8, "nr_neigh",
1420                 S_IFREG | S_IRUGO, 1, 0, 0,
1421                 0, &proc_net_inode_operations, 
1422                 nr_neigh_get_info
1423         });
1424         proc_net_register(&(struct proc_dir_entry) {
1425                 PROC_NET_NR_NODES, 8, "nr_nodes",
1426                 S_IFREG | S_IRUGO, 1, 0, 0,
1427                 0, &proc_net_inode_operations, 
1428                 nr_nodes_get_info
1429         });
1430 }
1431 
1432 #endif
/* */
root/net/netrom/af_netrom.c

DEFINITIONS
