git.oblomov.eu Git - linux-2.6/blob - net/rose/rose_route.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   8  * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net)
   9  */
  10 #include <linux/errno.h>
  11 #include <linux/types.h>
  12 #include <linux/socket.h>
  13 #include <linux/in.h>
  14 #include <linux/kernel.h>
  15 #include <linux/sched.h>
  16 #include <linux/timer.h>
  17 #include <linux/string.h>
  18 #include <linux/sockios.h>
  19 #include <linux/net.h>
  20 #include <net/ax25.h>
  21 #include <linux/inet.h>
  22 #include <linux/netdevice.h>
  23 #include <net/arp.h>
  24 #include <linux/if_arp.h>
  25 #include <linux/skbuff.h>
  26 #include <net/sock.h>
  27 #include <net/tcp.h>
  28 #include <asm/system.h>
  29 #include <asm/uaccess.h>
  30 #include <linux/fcntl.h>
  31 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  32 #include <linux/mm.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/notifier.h>
  35 #include <linux/netfilter.h>
  36 #include <linux/init.h>
  37 #include <net/rose.h>
  38 #include <linux/seq_file.h>
  39
  40 static unsigned int rose_neigh_no = 1;
  41
  42 static struct rose_node  *rose_node_list;
  43 static DEFINE_SPINLOCK(rose_node_list_lock);
  44 static struct rose_neigh *rose_neigh_list;
  45 static DEFINE_SPINLOCK(rose_neigh_list_lock);
  46 static struct rose_route *rose_route_list;
  47 static DEFINE_SPINLOCK(rose_route_list_lock);
  48
  49 struct rose_neigh *rose_loopback_neigh;
  50
  51 static void rose_remove_neigh(struct rose_neigh *);
  52
  53 /*
  54  *      Add a new route to a node, and in the process add the node and the
  55  *      neighbour if it is new.
  56  */
  57 static int rose_add_node(struct rose_route_struct *rose_route,
  58         struct net_device *dev)
  59 {
  60         struct rose_node  *rose_node, *rose_tmpn, *rose_tmpp;
  61         struct rose_neigh *rose_neigh;
  62         int i, res = 0;
  63
  64         spin_lock_bh(&rose_node_list_lock);
  65         spin_lock_bh(&rose_neigh_list_lock);
  66
  67         rose_node = rose_node_list;
  68         while (rose_node != NULL) {
  69                 if ((rose_node->mask == rose_route->mask) &&
  70                     (rosecmpm(&rose_route->address, &rose_node->address,
  71                               rose_route->mask) == 0))
  72                         break;
  73                 rose_node = rose_node->next;
  74         }
  75
  76         if (rose_node != NULL && rose_node->loopback) {
  77                 res = -EINVAL;
  78                 goto out;
  79         }
  80
  81         rose_neigh = rose_neigh_list;
  82         while (rose_neigh != NULL) {
  83                 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
  84                     && rose_neigh->dev == dev)
  85                         break;
  86                 rose_neigh = rose_neigh->next;
  87         }
  88
  89         if (rose_neigh == NULL) {
  90                 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
  91                 if (rose_neigh == NULL) {
  92                         res = -ENOMEM;
  93                         goto out;
  94                 }
  95
  96                 rose_neigh->callsign  = rose_route->neighbour;
  97                 rose_neigh->digipeat  = NULL;
  98                 rose_neigh->ax25      = NULL;
  99                 rose_neigh->dev       = dev;
 100                 rose_neigh->count     = 0;
 101                 rose_neigh->use       = 0;
 102                 rose_neigh->dce_mode  = 0;
 103                 rose_neigh->loopback  = 0;
 104                 rose_neigh->number    = rose_neigh_no++;
 105                 rose_neigh->restarted = 0;
 106
 107                 skb_queue_head_init(&rose_neigh->queue);
 108
 109                 init_timer(&rose_neigh->ftimer);
 110                 init_timer(&rose_neigh->t0timer);
 111
 112                 if (rose_route->ndigis != 0) {
 113                         if ((rose_neigh->digipeat = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
 114                                 kfree(rose_neigh);
 115                                 res = -ENOMEM;
 116                                 goto out;
 117                         }
 118
 119                         rose_neigh->digipeat->ndigi      = rose_route->ndigis;
 120                         rose_neigh->digipeat->lastrepeat = -1;
 121
 122                         for (i = 0; i < rose_route->ndigis; i++) {
 123                                 rose_neigh->digipeat->calls[i]    =
 124                                         rose_route->digipeaters[i];
 125                                 rose_neigh->digipeat->repeated[i] = 0;
 126                         }
 127                 }
 128
 129                 rose_neigh->next = rose_neigh_list;
 130                 rose_neigh_list  = rose_neigh;
 131         }
 132
 133         /*
 134          * This is a new node to be inserted into the list. Find where it needs
 135          * to be inserted into the list, and insert it. We want to be sure
 136          * to order the list in descending order of mask size to ensure that
 137          * later when we are searching this list the first match will be the
 138          * best match.
 139          */
 140         if (rose_node == NULL) {
 141                 rose_tmpn = rose_node_list;
 142                 rose_tmpp = NULL;
 143
 144                 while (rose_tmpn != NULL) {
 145                         if (rose_tmpn->mask > rose_route->mask) {
 146                                 rose_tmpp = rose_tmpn;
 147                                 rose_tmpn = rose_tmpn->next;
 148                         } else {
 149                                 break;
 150                         }
 151                 }
 152
 153                 /* create new node */
 154                 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
 155                 if (rose_node == NULL) {
 156                         res = -ENOMEM;
 157                         goto out;
 158                 }
 159
 160                 rose_node->address      = rose_route->address;
 161                 rose_node->mask         = rose_route->mask;
 162                 rose_node->count        = 1;
 163                 rose_node->loopback     = 0;
 164                 rose_node->neighbour[0] = rose_neigh;
 165
 166                 if (rose_tmpn == NULL) {
 167                         if (rose_tmpp == NULL) {        /* Empty list */
 168                                 rose_node_list  = rose_node;
 169                                 rose_node->next = NULL;
 170                         } else {
 171                                 rose_tmpp->next = rose_node;
 172                                 rose_node->next = NULL;
 173                         }
 174                 } else {
 175                         if (rose_tmpp == NULL) {        /* 1st node */
 176                                 rose_node->next = rose_node_list;
 177                                 rose_node_list  = rose_node;
 178                         } else {
 179                                 rose_tmpp->next = rose_node;
 180                                 rose_node->next = rose_tmpn;
 181                         }
 182                 }
 183                 rose_neigh->count++;
 184
 185                 goto out;
 186         }
 187
 188         /* We have space, slot it in */
 189         if (rose_node->count < 3) {
 190                 rose_node->neighbour[rose_node->count] = rose_neigh;
 191                 rose_node->count++;
 192                 rose_neigh->count++;
 193         }
 194
 195 out:
 196         spin_unlock_bh(&rose_neigh_list_lock);
 197         spin_unlock_bh(&rose_node_list_lock);
 198
 199         return res;
 200 }
 201
 202 /*
 203  * Caller is holding rose_node_list_lock.
 204  */
 205 static void rose_remove_node(struct rose_node *rose_node)
 206 {
 207         struct rose_node *s;
 208
 209         if ((s = rose_node_list) == rose_node) {
 210                 rose_node_list = rose_node->next;
 211                 kfree(rose_node);
 212                 return;
 213         }
 214
 215         while (s != NULL && s->next != NULL) {
 216                 if (s->next == rose_node) {
 217                         s->next = rose_node->next;
 218                         kfree(rose_node);
 219                         return;
 220                 }
 221
 222                 s = s->next;
 223         }
 224 }
 225
 226 /*
 227  * Caller is holding rose_neigh_list_lock.
 228  */
 229 static void rose_remove_neigh(struct rose_neigh *rose_neigh)
 230 {
 231         struct rose_neigh *s;
 232
 233         rose_stop_ftimer(rose_neigh);
 234         rose_stop_t0timer(rose_neigh);
 235
 236         skb_queue_purge(&rose_neigh->queue);
 237
 238         spin_lock_bh(&rose_neigh_list_lock);
 239
 240         if ((s = rose_neigh_list) == rose_neigh) {
 241                 rose_neigh_list = rose_neigh->next;
 242                 spin_unlock_bh(&rose_neigh_list_lock);
 243                 if (rose_neigh->digipeat != NULL)
 244                         kfree(rose_neigh->digipeat);
 245                 kfree(rose_neigh);
 246                 return;
 247         }
 248
 249         while (s != NULL && s->next != NULL) {
 250                 if (s->next == rose_neigh) {
 251                         s->next = rose_neigh->next;
 252                         spin_unlock_bh(&rose_neigh_list_lock);
 253                         if (rose_neigh->digipeat != NULL)
 254                                 kfree(rose_neigh->digipeat);
 255                         kfree(rose_neigh);
 256                         return;
 257                 }
 258
 259                 s = s->next;
 260         }
 261         spin_unlock_bh(&rose_neigh_list_lock);
 262 }
 263
 264 /*
 265  * Caller is holding rose_route_list_lock.
 266  */
 267 static void rose_remove_route(struct rose_route *rose_route)
 268 {
 269         struct rose_route *s;
 270
 271         if (rose_route->neigh1 != NULL)
 272                 rose_route->neigh1->use--;
 273
 274         if (rose_route->neigh2 != NULL)
 275                 rose_route->neigh2->use--;
 276
 277         if ((s = rose_route_list) == rose_route) {
 278                 rose_route_list = rose_route->next;
 279                 kfree(rose_route);
 280                 return;
 281         }
 282
 283         while (s != NULL && s->next != NULL) {
 284                 if (s->next == rose_route) {
 285                         s->next = rose_route->next;
 286                         kfree(rose_route);
 287                         return;
 288                 }
 289
 290                 s = s->next;
 291         }
 292 }
 293
 294 /*
 295  *      "Delete" a node. Strictly speaking remove a route to a node. The node
 296  *      is only deleted if no routes are left to it.
 297  */
 298 static int rose_del_node(struct rose_route_struct *rose_route,
 299         struct net_device *dev)
 300 {
 301         struct rose_node  *rose_node;
 302         struct rose_neigh *rose_neigh;
 303         int i, err = 0;
 304
 305         spin_lock_bh(&rose_node_list_lock);
 306         spin_lock_bh(&rose_neigh_list_lock);
 307
 308         rose_node = rose_node_list;
 309         while (rose_node != NULL) {
 310                 if ((rose_node->mask == rose_route->mask) &&
 311                     (rosecmpm(&rose_route->address, &rose_node->address,
 312                               rose_route->mask) == 0))
 313                         break;
 314                 rose_node = rose_node->next;
 315         }
 316
 317         if (rose_node == NULL || rose_node->loopback) {
 318                 err = -EINVAL;
 319                 goto out;
 320         }
 321
 322         rose_neigh = rose_neigh_list;
 323         while (rose_neigh != NULL) {
 324                 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
 325                     && rose_neigh->dev == dev)
 326                         break;
 327                 rose_neigh = rose_neigh->next;
 328         }
 329
 330         if (rose_neigh == NULL) {
 331                 err = -EINVAL;
 332                 goto out;
 333         }
 334
 335         for (i = 0; i < rose_node->count; i++) {
 336                 if (rose_node->neighbour[i] == rose_neigh) {
 337                         rose_neigh->count--;
 338
 339                         if (rose_neigh->count == 0 && rose_neigh->use == 0)
 340                                 rose_remove_neigh(rose_neigh);
 341
 342                         rose_node->count--;
 343
 344                         if (rose_node->count == 0) {
 345                                 rose_remove_node(rose_node);
 346                         } else {
 347                                 switch (i) {
 348                                 case 0:
 349                                         rose_node->neighbour[0] =
 350                                                 rose_node->neighbour[1];
 351                                 case 1:
 352                                         rose_node->neighbour[1] =
 353                                                 rose_node->neighbour[2];
 354                                 case 2:
 355                                         break;
 356                                 }
 357                         }
 358                         goto out;
 359                 }
 360         }
 361         err = -EINVAL;
 362
 363 out:
 364         spin_unlock_bh(&rose_neigh_list_lock);
 365         spin_unlock_bh(&rose_node_list_lock);
 366
 367         return err;
 368 }
 369
 370 /*
 371  *      Add the loopback neighbour.
 372  */
 373 int rose_add_loopback_neigh(void)
 374 {
 375         if ((rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_ATOMIC)) == NULL)
 376                 return -ENOMEM;
 377
 378         rose_loopback_neigh->callsign  = null_ax25_address;
 379         rose_loopback_neigh->digipeat  = NULL;
 380         rose_loopback_neigh->ax25      = NULL;
 381         rose_loopback_neigh->dev       = NULL;
 382         rose_loopback_neigh->count     = 0;
 383         rose_loopback_neigh->use       = 0;
 384         rose_loopback_neigh->dce_mode  = 1;
 385         rose_loopback_neigh->loopback  = 1;
 386         rose_loopback_neigh->number    = rose_neigh_no++;
 387         rose_loopback_neigh->restarted = 1;
 388
 389         skb_queue_head_init(&rose_loopback_neigh->queue);
 390
 391         init_timer(&rose_loopback_neigh->ftimer);
 392         init_timer(&rose_loopback_neigh->t0timer);
 393
 394         spin_lock_bh(&rose_neigh_list_lock);
 395         rose_loopback_neigh->next = rose_neigh_list;
 396         rose_neigh_list           = rose_loopback_neigh;
 397         spin_unlock_bh(&rose_neigh_list_lock);
 398
 399         return 0;
 400 }
 401
 402 /*
 403  *      Add a loopback node.
 404  */
 405 int rose_add_loopback_node(rose_address *address)
 406 {
 407         struct rose_node *rose_node;
 408         unsigned int err = 0;
 409
 410         spin_lock_bh(&rose_node_list_lock);
 411
 412         rose_node = rose_node_list;
 413         while (rose_node != NULL) {
 414                 if ((rose_node->mask == 10) &&
 415                      (rosecmpm(address, &rose_node->address, 10) == 0) &&
 416                      rose_node->loopback)
 417                         break;
 418                 rose_node = rose_node->next;
 419         }
 420
 421         if (rose_node != NULL)
 422                 goto out;
 423
 424         if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
 425                 err = -ENOMEM;
 426                 goto out;
 427         }
 428
 429         rose_node->address      = *address;
 430         rose_node->mask         = 10;
 431         rose_node->count        = 1;
 432         rose_node->loopback     = 1;
 433         rose_node->neighbour[0] = rose_loopback_neigh;
 434
 435         /* Insert at the head of list. Address is always mask=10 */
 436         rose_node->next = rose_node_list;
 437         rose_node_list  = rose_node;
 438
 439         rose_loopback_neigh->count++;
 440
 441 out:
 442         spin_unlock_bh(&rose_node_list_lock);
 443
 444         return 0;
 445 }
 446
 447 /*
 448  *      Delete a loopback node.
 449  */
 450 void rose_del_loopback_node(rose_address *address)
 451 {
 452         struct rose_node *rose_node;
 453
 454         spin_lock_bh(&rose_node_list_lock);
 455
 456         rose_node = rose_node_list;
 457         while (rose_node != NULL) {
 458                 if ((rose_node->mask == 10) &&
 459                     (rosecmpm(address, &rose_node->address, 10) == 0) &&
 460                     rose_node->loopback)
 461                         break;
 462                 rose_node = rose_node->next;
 463         }
 464
 465         if (rose_node == NULL)
 466                 goto out;
 467
 468         rose_remove_node(rose_node);
 469
 470         rose_loopback_neigh->count--;
 471
 472 out:
 473         spin_unlock_bh(&rose_node_list_lock);
 474 }
 475
 476 /*
 477  *      A device has been removed. Remove its routes and neighbours.
 478  */
 479 void rose_rt_device_down(struct net_device *dev)
 480 {
 481         struct rose_neigh *s, *rose_neigh;
 482         struct rose_node  *t, *rose_node;
 483         int i;
 484
 485         spin_lock_bh(&rose_node_list_lock);
 486         spin_lock_bh(&rose_neigh_list_lock);
 487         rose_neigh = rose_neigh_list;
 488         while (rose_neigh != NULL) {
 489                 s          = rose_neigh;
 490                 rose_neigh = rose_neigh->next;
 491
 492                 if (s->dev != dev)
 493                         continue;
 494
 495                 rose_node = rose_node_list;
 496
 497                 while (rose_node != NULL) {
 498                         t         = rose_node;
 499                         rose_node = rose_node->next;
 500
 501                         for (i = 0; i < t->count; i++) {
 502                                 if (t->neighbour[i] != s)
 503                                         continue;
 504
 505                                 t->count--;
 506
 507                                 switch (i) {
 508                                 case 0:
 509                                         t->neighbour[0] = t->neighbour[1];
 510                                 case 1:
 511                                         t->neighbour[1] = t->neighbour[2];
 512                                 case 2:
 513                                         break;
 514                                 }
 515                         }
 516
 517                         if (t->count <= 0)
 518                                 rose_remove_node(t);
 519                 }
 520
 521                 rose_remove_neigh(s);
 522         }
 523         spin_unlock_bh(&rose_neigh_list_lock);
 524         spin_unlock_bh(&rose_node_list_lock);
 525 }
 526
 527 #if 0 /* Currently unused */
 528 /*
 529  *      A device has been removed. Remove its links.
 530  */
 531 void rose_route_device_down(struct net_device *dev)
 532 {
 533         struct rose_route *s, *rose_route;
 534
 535         spin_lock_bh(&rose_route_list_lock);
 536         rose_route = rose_route_list;
 537         while (rose_route != NULL) {
 538                 s          = rose_route;
 539                 rose_route = rose_route->next;
 540
 541                 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
 542                         rose_remove_route(s);
 543         }
 544         spin_unlock_bh(&rose_route_list_lock);
 545 }
 546 #endif
 547
 548 /*
 549  *      Clear all nodes and neighbours out, except for neighbours with
 550  *      active connections going through them.
 551  *  Do not clear loopback neighbour and nodes.
 552  */
 553 static int rose_clear_routes(void)
 554 {
 555         struct rose_neigh *s, *rose_neigh;
 556         struct rose_node  *t, *rose_node;
 557
 558         spin_lock_bh(&rose_node_list_lock);
 559         spin_lock_bh(&rose_neigh_list_lock);
 560
 561         rose_neigh = rose_neigh_list;
 562         rose_node  = rose_node_list;
 563
 564         while (rose_node != NULL) {
 565                 t         = rose_node;
 566                 rose_node = rose_node->next;
 567                 if (!t->loopback)
 568                         rose_remove_node(t);
 569         }
 570
 571         while (rose_neigh != NULL) {
 572                 s          = rose_neigh;
 573                 rose_neigh = rose_neigh->next;
 574
 575                 if (s->use == 0 && !s->loopback) {
 576                         s->count = 0;
 577                         rose_remove_neigh(s);
 578                 }
 579         }
 580
 581         spin_unlock_bh(&rose_neigh_list_lock);
 582         spin_unlock_bh(&rose_node_list_lock);
 583
 584         return 0;
 585 }
 586
 587 /*
 588  *      Check that the device given is a valid AX.25 interface that is "up".
 589  */
 590 static struct net_device *rose_ax25_dev_get(char *devname)
 591 {
 592         struct net_device *dev;
 593
 594         if ((dev = dev_get_by_name(devname)) == NULL)
 595                 return NULL;
 596
 597         if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
 598                 return dev;
 599
 600         dev_put(dev);
 601         return NULL;
 602 }
 603
 604 /*
 605  *      Find the first active ROSE device, usually "rose0".
 606  */
 607 struct net_device *rose_dev_first(void)
 608 {
 609         struct net_device *dev, *first = NULL;
 610
 611         read_lock(&dev_base_lock);
 612         for (dev = dev_base; dev != NULL; dev = dev->next) {
 613                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
 614                         if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
 615                                 first = dev;
 616         }
 617         read_unlock(&dev_base_lock);
 618
 619         return first;
 620 }
 621
 622 /*
 623  *      Find the ROSE device for the given address.
 624  */
 625 struct net_device *rose_dev_get(rose_address *addr)
 626 {
 627         struct net_device *dev;
 628
 629         read_lock(&dev_base_lock);
 630         for (dev = dev_base; dev != NULL; dev = dev->next) {
 631                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
 632                         dev_hold(dev);
 633                         goto out;
 634                 }
 635         }
 636 out:
 637         read_unlock(&dev_base_lock);
 638         return dev;
 639 }
 640
 641 static int rose_dev_exists(rose_address *addr)
 642 {
 643         struct net_device *dev;
 644
 645         read_lock(&dev_base_lock);
 646         for (dev = dev_base; dev != NULL; dev = dev->next) {
 647                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
 648                         goto out;
 649         }
 650 out:
 651         read_unlock(&dev_base_lock);
 652         return dev != NULL;
 653 }
 654
 655
 656
 657
 658 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
 659 {
 660         struct rose_route *rose_route;
 661
 662         for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
 663                 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
 664                     (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
 665                         return rose_route;
 666
 667         return NULL;
 668 }
 669
 670 /*
 671  *      Find a neighbour given a ROSE address.
 672  */
 673 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
 674         unsigned char *diagnostic)
 675 {
 676         struct rose_neigh *res = NULL;
 677         struct rose_node *node;
 678         int failed = 0;
 679         int i;
 680
 681         spin_lock_bh(&rose_node_list_lock);
 682         for (node = rose_node_list; node != NULL; node = node->next) {
 683                 if (rosecmpm(addr, &node->address, node->mask) == 0) {
 684                         for (i = 0; i < node->count; i++) {
 685                                 if (!rose_ftimer_running(node->neighbour[i])) {
 686                                         res = node->neighbour[i];
 687                                         goto out;
 688                                 } else
 689                                         failed = 1;
 690                         }
 691                         break;
 692                 }
 693         }
 694
 695         if (failed) {
 696                 *cause      = ROSE_OUT_OF_ORDER;
 697                 *diagnostic = 0;
 698         } else {
 699                 *cause      = ROSE_NOT_OBTAINABLE;
 700                 *diagnostic = 0;
 701         }
 702
 703 out:
 704         spin_unlock_bh(&rose_node_list_lock);
 705
 706         return res;
 707 }
 708
 709 /*
 710  *      Handle the ioctls that control the routing functions.
 711  */
 712 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
 713 {
 714         struct rose_route_struct rose_route;
 715         struct net_device *dev;
 716         int err;
 717
 718         switch (cmd) {
 719         case SIOCADDRT:
 720                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 721                         return -EFAULT;
 722                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 723                         return -EINVAL;
 724                 if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
 725                         dev_put(dev);
 726                         return -EINVAL;
 727                 }
 728                 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
 729                         return -EINVAL;
 730                 if (rose_route.ndigis > 8) /* No more than 8 digipeats */
 731                         return -EINVAL;
 732                 err = rose_add_node(&rose_route, dev);
 733                 dev_put(dev);
 734                 return err;
 735
 736         case SIOCDELRT:
 737                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 738                         return -EFAULT;
 739                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 740                         return -EINVAL;
 741                 err = rose_del_node(&rose_route, dev);
 742                 dev_put(dev);
 743                 return err;
 744
 745         case SIOCRSCLRRT:
 746                 return rose_clear_routes();
 747
 748         default:
 749                 return -EINVAL;
 750         }
 751
 752         return 0;
 753 }
 754
 755 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
 756 {
 757         struct rose_route *rose_route, *s;
 758
 759         rose_neigh->restarted = 0;
 760
 761         rose_stop_t0timer(rose_neigh);
 762         rose_start_ftimer(rose_neigh);
 763
 764         skb_queue_purge(&rose_neigh->queue);
 765
 766         spin_lock_bh(&rose_route_list_lock);
 767
 768         rose_route = rose_route_list;
 769
 770         while (rose_route != NULL) {
 771                 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
 772                     (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL)       ||
 773                     (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
 774                         s = rose_route->next;
 775                         rose_remove_route(rose_route);
 776                         rose_route = s;
 777                         continue;
 778                 }
 779
 780                 if (rose_route->neigh1 == rose_neigh) {
 781                         rose_route->neigh1->use--;
 782                         rose_route->neigh1 = NULL;
 783                         rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
 784                 }
 785
 786                 if (rose_route->neigh2 == rose_neigh) {
 787                         rose_route->neigh2->use--;
 788                         rose_route->neigh2 = NULL;
 789                         rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
 790                 }
 791
 792                 rose_route = rose_route->next;
 793         }
 794         spin_unlock_bh(&rose_route_list_lock);
 795 }
 796
 797 /*
 798  *      A level 2 link has timed out, therefore it appears to be a poor link,
 799  *      then don't use that neighbour until it is reset. Blow away all through
 800  *      routes and connections using this route.
 801  */
 802 void rose_link_failed(ax25_cb *ax25, int reason)
 803 {
 804         struct rose_neigh *rose_neigh;
 805
 806         spin_lock_bh(&rose_neigh_list_lock);
 807         rose_neigh = rose_neigh_list;
 808         while (rose_neigh != NULL) {
 809                 if (rose_neigh->ax25 == ax25)
 810                         break;
 811                 rose_neigh = rose_neigh->next;
 812         }
 813
 814         if (rose_neigh != NULL) {
 815                 rose_neigh->ax25 = NULL;
 816
 817                 rose_del_route_by_neigh(rose_neigh);
 818                 rose_kill_by_neigh(rose_neigh);
 819         }
 820         spin_unlock_bh(&rose_neigh_list_lock);
 821 }
 822
 823 /*
 824  *      A device has been "downed" remove its link status. Blow away all
 825  *      through routes and connections that use this device.
 826  */
 827 void rose_link_device_down(struct net_device *dev)
 828 {
 829         struct rose_neigh *rose_neigh;
 830
 831         for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
 832                 if (rose_neigh->dev == dev) {
 833                         rose_del_route_by_neigh(rose_neigh);
 834                         rose_kill_by_neigh(rose_neigh);
 835                 }
 836         }
 837 }
 838
 839 /*
 840  *      Route a frame to an appropriate AX.25 connection.
 841  */
 842 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
 843 {
 844         struct rose_neigh *rose_neigh, *new_neigh;
 845         struct rose_route *rose_route;
 846         struct rose_facilities_struct facilities;
 847         rose_address *src_addr, *dest_addr;
 848         struct sock *sk;
 849         unsigned short frametype;
 850         unsigned int lci, new_lci;
 851         unsigned char cause, diagnostic;
 852         struct net_device *dev;
 853         int len, res = 0;
 854
 855 #if 0
 856         if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
 857                 return res;
 858 #endif
 859
 860         frametype = skb->data[2];
 861         lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
 862         src_addr  = (rose_address *)(skb->data + 9);
 863         dest_addr = (rose_address *)(skb->data + 4);
 864
 865         spin_lock_bh(&rose_node_list_lock);
 866         spin_lock_bh(&rose_neigh_list_lock);
 867         spin_lock_bh(&rose_route_list_lock);
 868
 869         rose_neigh = rose_neigh_list;
 870         while (rose_neigh != NULL) {
 871                 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
 872                     ax25->ax25_dev->dev == rose_neigh->dev)
 873                         break;
 874                 rose_neigh = rose_neigh->next;
 875         }
 876
 877         if (rose_neigh == NULL) {
 878                 printk("rose_route : unknown neighbour or device %s\n",
 879                        ax2asc(&ax25->dest_addr));
 880                 goto out;
 881         }
 882
 883         /*
 884          *      Obviously the link is working, halt the ftimer.
 885          */
 886         rose_stop_ftimer(rose_neigh);
 887
 888         /*
 889          *      LCI of zero is always for us, and its always a restart
 890          *      frame.
 891          */
 892         if (lci == 0) {
 893                 rose_link_rx_restart(skb, rose_neigh, frametype);
 894                 goto out;
 895         }
 896
 897         /*
 898          *      Find an existing socket.
 899          */
 900         if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
 901                 if (frametype == ROSE_CALL_REQUEST) {
 902                         struct rose_sock *rose = rose_sk(sk);
 903
 904                         /* Remove an existing unused socket */
 905                         rose_clear_queues(sk);
 906                         rose->cause      = ROSE_NETWORK_CONGESTION;
 907                         rose->diagnostic = 0;
 908                         rose->neighbour->use--;
 909                         rose->neighbour  = NULL;
 910                         rose->lci        = 0;
 911                         rose->state      = ROSE_STATE_0;
 912                         sk->sk_state     = TCP_CLOSE;
 913                         sk->sk_err       = 0;
 914                         sk->sk_shutdown  |= SEND_SHUTDOWN;
 915                         if (!sock_flag(sk, SOCK_DEAD)) {
 916                                 sk->sk_state_change(sk);
 917                                 sock_set_flag(sk, SOCK_DEAD);
 918                         }
 919                 }
 920                 else {
 921                         skb->h.raw = skb->data;
 922                         res = rose_process_rx_frame(sk, skb);
 923                         goto out;
 924                 }
 925         }
 926
 927         /*
 928          *      Is is a Call Request and is it for us ?
 929          */
 930         if (frametype == ROSE_CALL_REQUEST)
 931                 if ((dev = rose_dev_get(dest_addr)) != NULL) {
 932                         res = rose_rx_call_request(skb, dev, rose_neigh, lci);
 933                         dev_put(dev);
 934                         goto out;
 935                 }
 936
 937         if (!sysctl_rose_routing_control) {
 938                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
 939                 goto out;
 940         }
 941
 942         /*
 943          *      Route it to the next in line if we have an entry for it.
 944          */
 945         rose_route = rose_route_list;
 946         while (rose_route != NULL) {
 947                 if (rose_route->lci1 == lci &&
 948                     rose_route->neigh1 == rose_neigh) {
 949                         if (frametype == ROSE_CALL_REQUEST) {
 950                                 /* F6FBB - Remove an existing unused route */
 951                                 rose_remove_route(rose_route);
 952                                 break;
 953                         } else if (rose_route->neigh2 != NULL) {
 954                                 skb->data[0] &= 0xF0;
 955                                 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
 956                                 skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
 957                                 rose_transmit_link(skb, rose_route->neigh2);
 958                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 959                                         rose_remove_route(rose_route);
 960                                 res = 1;
 961                                 goto out;
 962                         } else {
 963                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 964                                         rose_remove_route(rose_route);
 965                                 goto out;
 966                         }
 967                 }
 968                 if (rose_route->lci2 == lci &&
 969                     rose_route->neigh2 == rose_neigh) {
 970                         if (frametype == ROSE_CALL_REQUEST) {
 971                                 /* F6FBB - Remove an existing unused route */
 972                                 rose_remove_route(rose_route);
 973                                 break;
 974                         } else if (rose_route->neigh1 != NULL) {
 975                                 skb->data[0] &= 0xF0;
 976                                 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
 977                                 skb->data[1]  = (rose_route->lci1 >> 0) & 0xFF;
 978                                 rose_transmit_link(skb, rose_route->neigh1);
 979                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 980                                         rose_remove_route(rose_route);
 981                                 res = 1;
 982                                 goto out;
 983                         } else {
 984                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 985                                         rose_remove_route(rose_route);
 986                                 goto out;
 987                         }
 988                 }
 989                 rose_route = rose_route->next;
 990         }
 991
 992         /*
 993          *      We know that:
 994          *      1. The frame isn't for us,
 995          *      2. It isn't "owned" by any existing route.
 996          */
 997         if (frametype != ROSE_CALL_REQUEST)     /* XXX */
 998                 return 0;
 999
1000         len  = (((skb->data[3] >> 4) & 0x0F) + 1) / 2;
1001         len += (((skb->data[3] >> 0) & 0x0F) + 1) / 2;
1002
1003         memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1004
1005         if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
1006                 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1007                 goto out;
1008         }
1009
1010         /*
1011          *      Check for routing loops.
1012          */
1013         rose_route = rose_route_list;
1014         while (rose_route != NULL) {
1015                 if (rose_route->rand == facilities.rand &&
1016                     rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1017                     ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1018                     ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1019                         rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1020                         goto out;
1021                 }
1022                 rose_route = rose_route->next;
1023         }
1024
1025         if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == NULL) {
1026                 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1027                 goto out;
1028         }
1029
1030         if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1031                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1032                 goto out;
1033         }
1034
1035         if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1036                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1037                 goto out;
1038         }
1039
1040         rose_route->lci1      = lci;
1041         rose_route->src_addr  = *src_addr;
1042         rose_route->dest_addr = *dest_addr;
1043         rose_route->src_call  = facilities.dest_call;
1044         rose_route->dest_call = facilities.source_call;
1045         rose_route->rand      = facilities.rand;
1046         rose_route->neigh1    = rose_neigh;
1047         rose_route->lci2      = new_lci;
1048         rose_route->neigh2    = new_neigh;
1049
1050         rose_route->neigh1->use++;
1051         rose_route->neigh2->use++;
1052
1053         rose_route->next = rose_route_list;
1054         rose_route_list  = rose_route;
1055
1056         skb->data[0] &= 0xF0;
1057         skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1058         skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
1059
1060         rose_transmit_link(skb, rose_route->neigh2);
1061         res = 1;
1062
1063 out:
1064         spin_unlock_bh(&rose_route_list_lock);
1065         spin_unlock_bh(&rose_neigh_list_lock);
1066         spin_unlock_bh(&rose_node_list_lock);
1067
1068         return res;
1069 }
1070
1071 #ifdef CONFIG_PROC_FS
1072
1073 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1074 {
1075         struct rose_node *rose_node;
1076         int i = 1;
1077
1078         spin_lock_bh(&rose_neigh_list_lock);
1079         if (*pos == 0)
1080                 return SEQ_START_TOKEN;
1081
1082         for (rose_node = rose_node_list; rose_node && i < *pos;
1083              rose_node = rose_node->next, ++i);
1084
1085         return (i == *pos) ? rose_node : NULL;
1086 }
1087
1088 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1089 {
1090         ++*pos;
1091
1092         return (v == SEQ_START_TOKEN) ? rose_node_list
1093                 : ((struct rose_node *)v)->next;
1094 }
1095
1096 static void rose_node_stop(struct seq_file *seq, void *v)
1097 {
1098         spin_unlock_bh(&rose_neigh_list_lock);
1099 }
1100
1101 static int rose_node_show(struct seq_file *seq, void *v)
1102 {
1103         int i;
1104
1105         if (v == SEQ_START_TOKEN)
1106                 seq_puts(seq, "address    mask n neigh neigh neigh\n");
1107         else {
1108                 const struct rose_node *rose_node = v;
1109                 /* if (rose_node->loopback) {
1110                         seq_printf(seq, "%-10s %04d 1 loopback\n",
1111                                 rose2asc(&rose_node->address),
1112                                 rose_node->mask);
1113                 } else { */
1114                         seq_printf(seq, "%-10s %04d %d",
1115                                 rose2asc(&rose_node->address),
1116                                 rose_node->mask,
1117                                 rose_node->count);
1118
1119                         for (i = 0; i < rose_node->count; i++)
1120                                 seq_printf(seq, " %05d",
1121                                         rose_node->neighbour[i]->number);
1122
1123                         seq_puts(seq, "\n");
1124                 /* } */
1125         }
1126         return 0;
1127 }
1128
1129 static struct seq_operations rose_node_seqops = {
1130         .start = rose_node_start,
1131         .next = rose_node_next,
1132         .stop = rose_node_stop,
1133         .show = rose_node_show,
1134 };
1135
1136 static int rose_nodes_open(struct inode *inode, struct file *file)
1137 {
1138         return seq_open(file, &rose_node_seqops);
1139 }
1140
1141 struct file_operations rose_nodes_fops = {
1142         .owner = THIS_MODULE,
1143         .open = rose_nodes_open,
1144         .read = seq_read,
1145         .llseek = seq_lseek,
1146         .release = seq_release,
1147 };
1148
1149 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1150 {
1151         struct rose_neigh *rose_neigh;
1152         int i = 1;
1153
1154         spin_lock_bh(&rose_neigh_list_lock);
1155         if (*pos == 0)
1156                 return SEQ_START_TOKEN;
1157
1158         for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1159              rose_neigh = rose_neigh->next, ++i);
1160
1161         return (i == *pos) ? rose_neigh : NULL;
1162 }
1163
1164 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1165 {
1166         ++*pos;
1167
1168         return (v == SEQ_START_TOKEN) ? rose_neigh_list
1169                 : ((struct rose_neigh *)v)->next;
1170 }
1171
1172 static void rose_neigh_stop(struct seq_file *seq, void *v)
1173 {
1174         spin_unlock_bh(&rose_neigh_list_lock);
1175 }
1176
1177 static int rose_neigh_show(struct seq_file *seq, void *v)
1178 {
1179         int i;
1180
1181         if (v == SEQ_START_TOKEN)
1182                 seq_puts(seq,
1183                          "addr  callsign  dev  count use mode restart  t0  tf digipeaters\n");
1184         else {
1185                 struct rose_neigh *rose_neigh = v;
1186
1187                 /* if (!rose_neigh->loopback) { */
1188                 seq_printf(seq, "%05d %-9s %-4s   %3d %3d  %3s     %3s %3lu %3lu",
1189                            rose_neigh->number,
1190                            (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(&rose_neigh->callsign),
1191                            rose_neigh->dev ? rose_neigh->dev->name : "???",
1192                            rose_neigh->count,
1193                            rose_neigh->use,
1194                            (rose_neigh->dce_mode) ? "DCE" : "DTE",
1195                            (rose_neigh->restarted) ? "yes" : "no",
1196                            ax25_display_timer(&rose_neigh->t0timer) / HZ,
1197                            ax25_display_timer(&rose_neigh->ftimer)  / HZ);
1198
1199                 if (rose_neigh->digipeat != NULL) {
1200                         for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1201                                 seq_printf(seq, " %s", ax2asc(&rose_neigh->digipeat->calls[i]));
1202                 }
1203
1204                 seq_puts(seq, "\n");
1205         }
1206         return 0;
1207 }
1208
1209
1210 static struct seq_operations rose_neigh_seqops = {
1211         .start = rose_neigh_start,
1212         .next = rose_neigh_next,
1213         .stop = rose_neigh_stop,
1214         .show = rose_neigh_show,
1215 };
1216
1217 static int rose_neigh_open(struct inode *inode, struct file *file)
1218 {
1219         return seq_open(file, &rose_neigh_seqops);
1220 }
1221
1222 struct file_operations rose_neigh_fops = {
1223         .owner = THIS_MODULE,
1224         .open = rose_neigh_open,
1225         .read = seq_read,
1226         .llseek = seq_lseek,
1227         .release = seq_release,
1228 };
1229
1230
1231 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1232 {
1233         struct rose_route *rose_route;
1234         int i = 1;
1235
1236         spin_lock_bh(&rose_route_list_lock);
1237         if (*pos == 0)
1238                 return SEQ_START_TOKEN;
1239
1240         for (rose_route = rose_route_list; rose_route && i < *pos;
1241              rose_route = rose_route->next, ++i);
1242
1243         return (i == *pos) ? rose_route : NULL;
1244 }
1245
1246 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1247 {
1248         ++*pos;
1249
1250         return (v == SEQ_START_TOKEN) ? rose_route_list
1251                 : ((struct rose_route *)v)->next;
1252 }
1253
1254 static void rose_route_stop(struct seq_file *seq, void *v)
1255 {
1256         spin_unlock_bh(&rose_route_list_lock);
1257 }
1258
1259 static int rose_route_show(struct seq_file *seq, void *v)
1260 {
1261         if (v == SEQ_START_TOKEN)
1262                 seq_puts(seq,
1263                          "lci  address     callsign   neigh  <-> lci  address     callsign   neigh\n");
1264         else {
1265                 struct rose_route *rose_route = v;
1266
1267                 if (rose_route->neigh1)
1268                         seq_printf(seq,
1269                                    "%3.3X  %-10s  %-9s  %05d      ",
1270                                    rose_route->lci1,
1271                                    rose2asc(&rose_route->src_addr),
1272                                    ax2asc(&rose_route->src_call),
1273                                    rose_route->neigh1->number);
1274                 else
1275                         seq_puts(seq,
1276                                  "000  *           *          00000      ");
1277
1278                 if (rose_route->neigh2)
1279                         seq_printf(seq,
1280                                    "%3.3X  %-10s  %-9s  %05d\n",
1281                                 rose_route->lci2,
1282                                 rose2asc(&rose_route->dest_addr),
1283                                 ax2asc(&rose_route->dest_call),
1284                                 rose_route->neigh2->number);
1285                  else
1286                          seq_puts(seq,
1287                                   "000  *           *          00000\n");
1288                 }
1289         return 0;
1290 }
1291
1292 static struct seq_operations rose_route_seqops = {
1293         .start = rose_route_start,
1294         .next = rose_route_next,
1295         .stop = rose_route_stop,
1296         .show = rose_route_show,
1297 };
1298
1299 static int rose_route_open(struct inode *inode, struct file *file)
1300 {
1301         return seq_open(file, &rose_route_seqops);
1302 }
1303
1304 struct file_operations rose_routes_fops = {
1305         .owner = THIS_MODULE,
1306         .open = rose_route_open,
1307         .read = seq_read,
1308         .llseek = seq_lseek,
1309         .release = seq_release,
1310 };
1311
1312 #endif /* CONFIG_PROC_FS */
1313
1314 /*
1315  *      Release all memory associated with ROSE routing structures.
1316  */
1317 void __exit rose_rt_free(void)
1318 {
1319         struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1320         struct rose_node  *t, *rose_node  = rose_node_list;
1321         struct rose_route *u, *rose_route = rose_route_list;
1322
1323         while (rose_neigh != NULL) {
1324                 s          = rose_neigh;
1325                 rose_neigh = rose_neigh->next;
1326
1327                 rose_remove_neigh(s);
1328         }
1329
1330         while (rose_node != NULL) {
1331                 t         = rose_node;
1332                 rose_node = rose_node->next;
1333
1334                 rose_remove_node(t);
1335         }
1336
1337         while (rose_route != NULL) {
1338                 u          = rose_route;
1339                 rose_route = rose_route->next;
1340
1341                 rose_remove_route(u);
1342         }
1343 }