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_states.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 /*
  52  *      Add a new route to a node, and in the process add the node and the
  53  *      neighbour if it is new.
  54  */
  55 static int rose_add_node(struct rose_route_struct *rose_route,
  56         struct net_device *dev)
  57 {
  58         struct rose_node  *rose_node, *rose_tmpn, *rose_tmpp;
  59         struct rose_neigh *rose_neigh;
  60         int i, res = 0;
  61
  62         spin_lock_bh(&rose_node_list_lock);
  63         spin_lock_bh(&rose_neigh_list_lock);
  64
  65         rose_node = rose_node_list;
  66         while (rose_node != NULL) {
  67                 if ((rose_node->mask == rose_route->mask) &&
  68                     (rosecmpm(&rose_route->address, &rose_node->address,
  69                               rose_route->mask) == 0))
  70                         break;
  71                 rose_node = rose_node->next;
  72         }
  73
  74         if (rose_node != NULL && rose_node->loopback) {
  75                 res = -EINVAL;
  76                 goto out;
  77         }
  78
  79         rose_neigh = rose_neigh_list;
  80         while (rose_neigh != NULL) {
  81                 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
  82                     && rose_neigh->dev == dev)
  83                         break;
  84                 rose_neigh = rose_neigh->next;
  85         }
  86
  87         if (rose_neigh == NULL) {
  88                 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
  89                 if (rose_neigh == NULL) {
  90                         res = -ENOMEM;
  91                         goto out;
  92                 }
  93
  94                 rose_neigh->callsign  = rose_route->neighbour;
  95                 rose_neigh->digipeat  = NULL;
  96                 rose_neigh->ax25      = NULL;
  97                 rose_neigh->dev       = dev;
  98                 rose_neigh->count     = 0;
  99                 rose_neigh->use       = 0;
 100                 rose_neigh->dce_mode  = 0;
 101                 rose_neigh->loopback  = 0;
 102                 rose_neigh->number    = rose_neigh_no++;
 103                 rose_neigh->restarted = 0;
 104
 105                 skb_queue_head_init(&rose_neigh->queue);
 106
 107                 init_timer(&rose_neigh->ftimer);
 108                 init_timer(&rose_neigh->t0timer);
 109
 110                 if (rose_route->ndigis != 0) {
 111                         if ((rose_neigh->digipeat = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
 112                                 kfree(rose_neigh);
 113                                 res = -ENOMEM;
 114                                 goto out;
 115                         }
 116
 117                         rose_neigh->digipeat->ndigi      = rose_route->ndigis;
 118                         rose_neigh->digipeat->lastrepeat = -1;
 119
 120                         for (i = 0; i < rose_route->ndigis; i++) {
 121                                 rose_neigh->digipeat->calls[i]    =
 122                                         rose_route->digipeaters[i];
 123                                 rose_neigh->digipeat->repeated[i] = 0;
 124                         }
 125                 }
 126
 127                 rose_neigh->next = rose_neigh_list;
 128                 rose_neigh_list  = rose_neigh;
 129         }
 130
 131         /*
 132          * This is a new node to be inserted into the list. Find where it needs
 133          * to be inserted into the list, and insert it. We want to be sure
 134          * to order the list in descending order of mask size to ensure that
 135          * later when we are searching this list the first match will be the
 136          * best match.
 137          */
 138         if (rose_node == NULL) {
 139                 rose_tmpn = rose_node_list;
 140                 rose_tmpp = NULL;
 141
 142                 while (rose_tmpn != NULL) {
 143                         if (rose_tmpn->mask > rose_route->mask) {
 144                                 rose_tmpp = rose_tmpn;
 145                                 rose_tmpn = rose_tmpn->next;
 146                         } else {
 147                                 break;
 148                         }
 149                 }
 150
 151                 /* create new node */
 152                 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
 153                 if (rose_node == NULL) {
 154                         res = -ENOMEM;
 155                         goto out;
 156                 }
 157
 158                 rose_node->address      = rose_route->address;
 159                 rose_node->mask         = rose_route->mask;
 160                 rose_node->count        = 1;
 161                 rose_node->loopback     = 0;
 162                 rose_node->neighbour[0] = rose_neigh;
 163
 164                 if (rose_tmpn == NULL) {
 165                         if (rose_tmpp == NULL) {        /* Empty list */
 166                                 rose_node_list  = rose_node;
 167                                 rose_node->next = NULL;
 168                         } else {
 169                                 rose_tmpp->next = rose_node;
 170                                 rose_node->next = NULL;
 171                         }
 172                 } else {
 173                         if (rose_tmpp == NULL) {        /* 1st node */
 174                                 rose_node->next = rose_node_list;
 175                                 rose_node_list  = rose_node;
 176                         } else {
 177                                 rose_tmpp->next = rose_node;
 178                                 rose_node->next = rose_tmpn;
 179                         }
 180                 }
 181                 rose_neigh->count++;
 182
 183                 goto out;
 184         }
 185
 186         /* We have space, slot it in */
 187         if (rose_node->count < 3) {
 188                 rose_node->neighbour[rose_node->count] = rose_neigh;
 189                 rose_node->count++;
 190                 rose_neigh->count++;
 191         }
 192
 193 out:
 194         spin_unlock_bh(&rose_neigh_list_lock);
 195         spin_unlock_bh(&rose_node_list_lock);
 196
 197         return res;
 198 }
 199
 200 /*
 201  * Caller is holding rose_node_list_lock.
 202  */
 203 static void rose_remove_node(struct rose_node *rose_node)
 204 {
 205         struct rose_node *s;
 206
 207         if ((s = rose_node_list) == rose_node) {
 208                 rose_node_list = rose_node->next;
 209                 kfree(rose_node);
 210                 return;
 211         }
 212
 213         while (s != NULL && s->next != NULL) {
 214                 if (s->next == rose_node) {
 215                         s->next = rose_node->next;
 216                         kfree(rose_node);
 217                         return;
 218                 }
 219
 220                 s = s->next;
 221         }
 222 }
 223
 224 /*
 225  * Caller is holding rose_neigh_list_lock.
 226  */
 227 static void rose_remove_neigh(struct rose_neigh *rose_neigh)
 228 {
 229         struct rose_neigh *s;
 230
 231         rose_stop_ftimer(rose_neigh);
 232         rose_stop_t0timer(rose_neigh);
 233
 234         skb_queue_purge(&rose_neigh->queue);
 235
 236         if ((s = rose_neigh_list) == rose_neigh) {
 237                 rose_neigh_list = rose_neigh->next;
 238                 kfree(rose_neigh->digipeat);
 239                 kfree(rose_neigh);
 240                 return;
 241         }
 242
 243         while (s != NULL && s->next != NULL) {
 244                 if (s->next == rose_neigh) {
 245                         s->next = rose_neigh->next;
 246                         kfree(rose_neigh->digipeat);
 247                         kfree(rose_neigh);
 248                         return;
 249                 }
 250
 251                 s = s->next;
 252         }
 253 }
 254
 255 /*
 256  * Caller is holding rose_route_list_lock.
 257  */
 258 static void rose_remove_route(struct rose_route *rose_route)
 259 {
 260         struct rose_route *s;
 261
 262         if (rose_route->neigh1 != NULL)
 263                 rose_route->neigh1->use--;
 264
 265         if (rose_route->neigh2 != NULL)
 266                 rose_route->neigh2->use--;
 267
 268         if ((s = rose_route_list) == rose_route) {
 269                 rose_route_list = rose_route->next;
 270                 kfree(rose_route);
 271                 return;
 272         }
 273
 274         while (s != NULL && s->next != NULL) {
 275                 if (s->next == rose_route) {
 276                         s->next = rose_route->next;
 277                         kfree(rose_route);
 278                         return;
 279                 }
 280
 281                 s = s->next;
 282         }
 283 }
 284
 285 /*
 286  *      "Delete" a node. Strictly speaking remove a route to a node. The node
 287  *      is only deleted if no routes are left to it.
 288  */
 289 static int rose_del_node(struct rose_route_struct *rose_route,
 290         struct net_device *dev)
 291 {
 292         struct rose_node  *rose_node;
 293         struct rose_neigh *rose_neigh;
 294         int i, err = 0;
 295
 296         spin_lock_bh(&rose_node_list_lock);
 297         spin_lock_bh(&rose_neigh_list_lock);
 298
 299         rose_node = rose_node_list;
 300         while (rose_node != NULL) {
 301                 if ((rose_node->mask == rose_route->mask) &&
 302                     (rosecmpm(&rose_route->address, &rose_node->address,
 303                               rose_route->mask) == 0))
 304                         break;
 305                 rose_node = rose_node->next;
 306         }
 307
 308         if (rose_node == NULL || rose_node->loopback) {
 309                 err = -EINVAL;
 310                 goto out;
 311         }
 312
 313         rose_neigh = rose_neigh_list;
 314         while (rose_neigh != NULL) {
 315                 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
 316                     && rose_neigh->dev == dev)
 317                         break;
 318                 rose_neigh = rose_neigh->next;
 319         }
 320
 321         if (rose_neigh == NULL) {
 322                 err = -EINVAL;
 323                 goto out;
 324         }
 325
 326         for (i = 0; i < rose_node->count; i++) {
 327                 if (rose_node->neighbour[i] == rose_neigh) {
 328                         rose_neigh->count--;
 329
 330                         if (rose_neigh->count == 0 && rose_neigh->use == 0)
 331                                 rose_remove_neigh(rose_neigh);
 332
 333                         rose_node->count--;
 334
 335                         if (rose_node->count == 0) {
 336                                 rose_remove_node(rose_node);
 337                         } else {
 338                                 switch (i) {
 339                                 case 0:
 340                                         rose_node->neighbour[0] =
 341                                                 rose_node->neighbour[1];
 342                                 case 1:
 343                                         rose_node->neighbour[1] =
 344                                                 rose_node->neighbour[2];
 345                                 case 2:
 346                                         break;
 347                                 }
 348                         }
 349                         goto out;
 350                 }
 351         }
 352         err = -EINVAL;
 353
 354 out:
 355         spin_unlock_bh(&rose_neigh_list_lock);
 356         spin_unlock_bh(&rose_node_list_lock);
 357
 358         return err;
 359 }
 360
 361 /*
 362  *      Add the loopback neighbour.
 363  */
 364 int rose_add_loopback_neigh(void)
 365 {
 366         if ((rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_ATOMIC)) == NULL)
 367                 return -ENOMEM;
 368
 369         rose_loopback_neigh->callsign  = null_ax25_address;
 370         rose_loopback_neigh->digipeat  = NULL;
 371         rose_loopback_neigh->ax25      = NULL;
 372         rose_loopback_neigh->dev       = NULL;
 373         rose_loopback_neigh->count     = 0;
 374         rose_loopback_neigh->use       = 0;
 375         rose_loopback_neigh->dce_mode  = 1;
 376         rose_loopback_neigh->loopback  = 1;
 377         rose_loopback_neigh->number    = rose_neigh_no++;
 378         rose_loopback_neigh->restarted = 1;
 379
 380         skb_queue_head_init(&rose_loopback_neigh->queue);
 381
 382         init_timer(&rose_loopback_neigh->ftimer);
 383         init_timer(&rose_loopback_neigh->t0timer);
 384
 385         spin_lock_bh(&rose_neigh_list_lock);
 386         rose_loopback_neigh->next = rose_neigh_list;
 387         rose_neigh_list           = rose_loopback_neigh;
 388         spin_unlock_bh(&rose_neigh_list_lock);
 389
 390         return 0;
 391 }
 392
 393 /*
 394  *      Add a loopback node.
 395  */
 396 int rose_add_loopback_node(rose_address *address)
 397 {
 398         struct rose_node *rose_node;
 399         unsigned int err = 0;
 400
 401         spin_lock_bh(&rose_node_list_lock);
 402
 403         rose_node = rose_node_list;
 404         while (rose_node != NULL) {
 405                 if ((rose_node->mask == 10) &&
 406                      (rosecmpm(address, &rose_node->address, 10) == 0) &&
 407                      rose_node->loopback)
 408                         break;
 409                 rose_node = rose_node->next;
 410         }
 411
 412         if (rose_node != NULL)
 413                 goto out;
 414
 415         if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
 416                 err = -ENOMEM;
 417                 goto out;
 418         }
 419
 420         rose_node->address      = *address;
 421         rose_node->mask         = 10;
 422         rose_node->count        = 1;
 423         rose_node->loopback     = 1;
 424         rose_node->neighbour[0] = rose_loopback_neigh;
 425
 426         /* Insert at the head of list. Address is always mask=10 */
 427         rose_node->next = rose_node_list;
 428         rose_node_list  = rose_node;
 429
 430         rose_loopback_neigh->count++;
 431
 432 out:
 433         spin_unlock_bh(&rose_node_list_lock);
 434
 435         return 0;
 436 }
 437
 438 /*
 439  *      Delete a loopback node.
 440  */
 441 void rose_del_loopback_node(rose_address *address)
 442 {
 443         struct rose_node *rose_node;
 444
 445         spin_lock_bh(&rose_node_list_lock);
 446
 447         rose_node = rose_node_list;
 448         while (rose_node != NULL) {
 449                 if ((rose_node->mask == 10) &&
 450                     (rosecmpm(address, &rose_node->address, 10) == 0) &&
 451                     rose_node->loopback)
 452                         break;
 453                 rose_node = rose_node->next;
 454         }
 455
 456         if (rose_node == NULL)
 457                 goto out;
 458
 459         rose_remove_node(rose_node);
 460
 461         rose_loopback_neigh->count--;
 462
 463 out:
 464         spin_unlock_bh(&rose_node_list_lock);
 465 }
 466
 467 /*
 468  *      A device has been removed. Remove its routes and neighbours.
 469  */
 470 void rose_rt_device_down(struct net_device *dev)
 471 {
 472         struct rose_neigh *s, *rose_neigh;
 473         struct rose_node  *t, *rose_node;
 474         int i;
 475
 476         spin_lock_bh(&rose_node_list_lock);
 477         spin_lock_bh(&rose_neigh_list_lock);
 478         rose_neigh = rose_neigh_list;
 479         while (rose_neigh != NULL) {
 480                 s          = rose_neigh;
 481                 rose_neigh = rose_neigh->next;
 482
 483                 if (s->dev != dev)
 484                         continue;
 485
 486                 rose_node = rose_node_list;
 487
 488                 while (rose_node != NULL) {
 489                         t         = rose_node;
 490                         rose_node = rose_node->next;
 491
 492                         for (i = 0; i < t->count; i++) {
 493                                 if (t->neighbour[i] != s)
 494                                         continue;
 495
 496                                 t->count--;
 497
 498                                 switch (i) {
 499                                 case 0:
 500                                         t->neighbour[0] = t->neighbour[1];
 501                                 case 1:
 502                                         t->neighbour[1] = t->neighbour[2];
 503                                 case 2:
 504                                         break;
 505                                 }
 506                         }
 507
 508                         if (t->count <= 0)
 509                                 rose_remove_node(t);
 510                 }
 511
 512                 rose_remove_neigh(s);
 513         }
 514         spin_unlock_bh(&rose_neigh_list_lock);
 515         spin_unlock_bh(&rose_node_list_lock);
 516 }
 517
 518 #if 0 /* Currently unused */
 519 /*
 520  *      A device has been removed. Remove its links.
 521  */
 522 void rose_route_device_down(struct net_device *dev)
 523 {
 524         struct rose_route *s, *rose_route;
 525
 526         spin_lock_bh(&rose_route_list_lock);
 527         rose_route = rose_route_list;
 528         while (rose_route != NULL) {
 529                 s          = rose_route;
 530                 rose_route = rose_route->next;
 531
 532                 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
 533                         rose_remove_route(s);
 534         }
 535         spin_unlock_bh(&rose_route_list_lock);
 536 }
 537 #endif
 538
 539 /*
 540  *      Clear all nodes and neighbours out, except for neighbours with
 541  *      active connections going through them.
 542  *  Do not clear loopback neighbour and nodes.
 543  */
 544 static int rose_clear_routes(void)
 545 {
 546         struct rose_neigh *s, *rose_neigh;
 547         struct rose_node  *t, *rose_node;
 548
 549         spin_lock_bh(&rose_node_list_lock);
 550         spin_lock_bh(&rose_neigh_list_lock);
 551
 552         rose_neigh = rose_neigh_list;
 553         rose_node  = rose_node_list;
 554
 555         while (rose_node != NULL) {
 556                 t         = rose_node;
 557                 rose_node = rose_node->next;
 558                 if (!t->loopback)
 559                         rose_remove_node(t);
 560         }
 561
 562         while (rose_neigh != NULL) {
 563                 s          = rose_neigh;
 564                 rose_neigh = rose_neigh->next;
 565
 566                 if (s->use == 0 && !s->loopback) {
 567                         s->count = 0;
 568                         rose_remove_neigh(s);
 569                 }
 570         }
 571
 572         spin_unlock_bh(&rose_neigh_list_lock);
 573         spin_unlock_bh(&rose_node_list_lock);
 574
 575         return 0;
 576 }
 577
 578 /*
 579  *      Check that the device given is a valid AX.25 interface that is "up".
 580  */
 581 static struct net_device *rose_ax25_dev_get(char *devname)
 582 {
 583         struct net_device *dev;
 584
 585         if ((dev = dev_get_by_name(devname)) == NULL)
 586                 return NULL;
 587
 588         if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
 589                 return dev;
 590
 591         dev_put(dev);
 592         return NULL;
 593 }
 594
 595 /*
 596  *      Find the first active ROSE device, usually "rose0".
 597  */
 598 struct net_device *rose_dev_first(void)
 599 {
 600         struct net_device *dev, *first = NULL;
 601
 602         read_lock(&dev_base_lock);
 603         for (dev = dev_base; dev != NULL; dev = dev->next) {
 604                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
 605                         if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
 606                                 first = dev;
 607         }
 608         read_unlock(&dev_base_lock);
 609
 610         return first;
 611 }
 612
 613 /*
 614  *      Find the ROSE device for the given address.
 615  */
 616 struct net_device *rose_dev_get(rose_address *addr)
 617 {
 618         struct net_device *dev;
 619
 620         read_lock(&dev_base_lock);
 621         for (dev = dev_base; dev != NULL; dev = dev->next) {
 622                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
 623                         dev_hold(dev);
 624                         goto out;
 625                 }
 626         }
 627 out:
 628         read_unlock(&dev_base_lock);
 629         return dev;
 630 }
 631
 632 static int rose_dev_exists(rose_address *addr)
 633 {
 634         struct net_device *dev;
 635
 636         read_lock(&dev_base_lock);
 637         for (dev = dev_base; dev != NULL; dev = dev->next) {
 638                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
 639                         goto out;
 640         }
 641 out:
 642         read_unlock(&dev_base_lock);
 643         return dev != NULL;
 644 }
 645
 646
 647
 648
 649 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
 650 {
 651         struct rose_route *rose_route;
 652
 653         for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
 654                 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
 655                     (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
 656                         return rose_route;
 657
 658         return NULL;
 659 }
 660
 661 /*
 662  *      Find a neighbour given a ROSE address.
 663  */
 664 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
 665         unsigned char *diagnostic)
 666 {
 667         struct rose_neigh *res = NULL;
 668         struct rose_node *node;
 669         int failed = 0;
 670         int i;
 671
 672         spin_lock_bh(&rose_node_list_lock);
 673         for (node = rose_node_list; node != NULL; node = node->next) {
 674                 if (rosecmpm(addr, &node->address, node->mask) == 0) {
 675                         for (i = 0; i < node->count; i++) {
 676                                 if (!rose_ftimer_running(node->neighbour[i])) {
 677                                         res = node->neighbour[i];
 678                                         goto out;
 679                                 } else
 680                                         failed = 1;
 681                         }
 682                         break;
 683                 }
 684         }
 685
 686         if (failed) {
 687                 *cause      = ROSE_OUT_OF_ORDER;
 688                 *diagnostic = 0;
 689         } else {
 690                 *cause      = ROSE_NOT_OBTAINABLE;
 691                 *diagnostic = 0;
 692         }
 693
 694 out:
 695         spin_unlock_bh(&rose_node_list_lock);
 696
 697         return res;
 698 }
 699
 700 /*
 701  *      Handle the ioctls that control the routing functions.
 702  */
 703 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
 704 {
 705         struct rose_route_struct rose_route;
 706         struct net_device *dev;
 707         int err;
 708
 709         switch (cmd) {
 710         case SIOCADDRT:
 711                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 712                         return -EFAULT;
 713                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 714                         return -EINVAL;
 715                 if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
 716                         dev_put(dev);
 717                         return -EINVAL;
 718                 }
 719                 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
 720                         return -EINVAL;
 721                 if (rose_route.ndigis > AX25_MAX_DIGIS)
 722                         return -EINVAL;
 723                 err = rose_add_node(&rose_route, dev);
 724                 dev_put(dev);
 725                 return err;
 726
 727         case SIOCDELRT:
 728                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 729                         return -EFAULT;
 730                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 731                         return -EINVAL;
 732                 err = rose_del_node(&rose_route, dev);
 733                 dev_put(dev);
 734                 return err;
 735
 736         case SIOCRSCLRRT:
 737                 return rose_clear_routes();
 738
 739         default:
 740                 return -EINVAL;
 741         }
 742
 743         return 0;
 744 }
 745
 746 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
 747 {
 748         struct rose_route *rose_route, *s;
 749
 750         rose_neigh->restarted = 0;
 751
 752         rose_stop_t0timer(rose_neigh);
 753         rose_start_ftimer(rose_neigh);
 754
 755         skb_queue_purge(&rose_neigh->queue);
 756
 757         spin_lock_bh(&rose_route_list_lock);
 758
 759         rose_route = rose_route_list;
 760
 761         while (rose_route != NULL) {
 762                 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
 763                     (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL)       ||
 764                     (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
 765                         s = rose_route->next;
 766                         rose_remove_route(rose_route);
 767                         rose_route = s;
 768                         continue;
 769                 }
 770
 771                 if (rose_route->neigh1 == rose_neigh) {
 772                         rose_route->neigh1->use--;
 773                         rose_route->neigh1 = NULL;
 774                         rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
 775                 }
 776
 777                 if (rose_route->neigh2 == rose_neigh) {
 778                         rose_route->neigh2->use--;
 779                         rose_route->neigh2 = NULL;
 780                         rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
 781                 }
 782
 783                 rose_route = rose_route->next;
 784         }
 785         spin_unlock_bh(&rose_route_list_lock);
 786 }
 787
 788 /*
 789  *      A level 2 link has timed out, therefore it appears to be a poor link,
 790  *      then don't use that neighbour until it is reset. Blow away all through
 791  *      routes and connections using this route.
 792  */
 793 void rose_link_failed(ax25_cb *ax25, int reason)
 794 {
 795         struct rose_neigh *rose_neigh;
 796
 797         spin_lock_bh(&rose_neigh_list_lock);
 798         rose_neigh = rose_neigh_list;
 799         while (rose_neigh != NULL) {
 800                 if (rose_neigh->ax25 == ax25)
 801                         break;
 802                 rose_neigh = rose_neigh->next;
 803         }
 804
 805         if (rose_neigh != NULL) {
 806                 rose_neigh->ax25 = NULL;
 807
 808                 rose_del_route_by_neigh(rose_neigh);
 809                 rose_kill_by_neigh(rose_neigh);
 810         }
 811         spin_unlock_bh(&rose_neigh_list_lock);
 812 }
 813
 814 /*
 815  *      A device has been "downed" remove its link status. Blow away all
 816  *      through routes and connections that use this device.
 817  */
 818 void rose_link_device_down(struct net_device *dev)
 819 {
 820         struct rose_neigh *rose_neigh;
 821
 822         for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
 823                 if (rose_neigh->dev == dev) {
 824                         rose_del_route_by_neigh(rose_neigh);
 825                         rose_kill_by_neigh(rose_neigh);
 826                 }
 827         }
 828 }
 829
 830 /*
 831  *      Route a frame to an appropriate AX.25 connection.
 832  */
 833 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
 834 {
 835         struct rose_neigh *rose_neigh, *new_neigh;
 836         struct rose_route *rose_route;
 837         struct rose_facilities_struct facilities;
 838         rose_address *src_addr, *dest_addr;
 839         struct sock *sk;
 840         unsigned short frametype;
 841         unsigned int lci, new_lci;
 842         unsigned char cause, diagnostic;
 843         struct net_device *dev;
 844         int len, res = 0;
 845         char buf[11];
 846
 847 #if 0
 848         if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
 849                 return res;
 850 #endif
 851
 852         frametype = skb->data[2];
 853         lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
 854         src_addr  = (rose_address *)(skb->data + 9);
 855         dest_addr = (rose_address *)(skb->data + 4);
 856
 857         spin_lock_bh(&rose_node_list_lock);
 858         spin_lock_bh(&rose_neigh_list_lock);
 859         spin_lock_bh(&rose_route_list_lock);
 860
 861         rose_neigh = rose_neigh_list;
 862         while (rose_neigh != NULL) {
 863                 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
 864                     ax25->ax25_dev->dev == rose_neigh->dev)
 865                         break;
 866                 rose_neigh = rose_neigh->next;
 867         }
 868
 869         if (rose_neigh == NULL) {
 870                 printk("rose_route : unknown neighbour or device %s\n",
 871                        ax2asc(buf, &ax25->dest_addr));
 872                 goto out;
 873         }
 874
 875         /*
 876          *      Obviously the link is working, halt the ftimer.
 877          */
 878         rose_stop_ftimer(rose_neigh);
 879
 880         /*
 881          *      LCI of zero is always for us, and its always a restart
 882          *      frame.
 883          */
 884         if (lci == 0) {
 885                 rose_link_rx_restart(skb, rose_neigh, frametype);
 886                 goto out;
 887         }
 888
 889         /*
 890          *      Find an existing socket.
 891          */
 892         if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
 893                 if (frametype == ROSE_CALL_REQUEST) {
 894                         struct rose_sock *rose = rose_sk(sk);
 895
 896                         /* Remove an existing unused socket */
 897                         rose_clear_queues(sk);
 898                         rose->cause      = ROSE_NETWORK_CONGESTION;
 899                         rose->diagnostic = 0;
 900                         rose->neighbour->use--;
 901                         rose->neighbour  = NULL;
 902                         rose->lci        = 0;
 903                         rose->state      = ROSE_STATE_0;
 904                         sk->sk_state     = TCP_CLOSE;
 905                         sk->sk_err       = 0;
 906                         sk->sk_shutdown  |= SEND_SHUTDOWN;
 907                         if (!sock_flag(sk, SOCK_DEAD)) {
 908                                 sk->sk_state_change(sk);
 909                                 sock_set_flag(sk, SOCK_DEAD);
 910                         }
 911                 }
 912                 else {
 913                         skb->h.raw = skb->data;
 914                         res = rose_process_rx_frame(sk, skb);
 915                         goto out;
 916                 }
 917         }
 918
 919         /*
 920          *      Is is a Call Request and is it for us ?
 921          */
 922         if (frametype == ROSE_CALL_REQUEST)
 923                 if ((dev = rose_dev_get(dest_addr)) != NULL) {
 924                         res = rose_rx_call_request(skb, dev, rose_neigh, lci);
 925                         dev_put(dev);
 926                         goto out;
 927                 }
 928
 929         if (!sysctl_rose_routing_control) {
 930                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
 931                 goto out;
 932         }
 933
 934         /*
 935          *      Route it to the next in line if we have an entry for it.
 936          */
 937         rose_route = rose_route_list;
 938         while (rose_route != NULL) {
 939                 if (rose_route->lci1 == lci &&
 940                     rose_route->neigh1 == rose_neigh) {
 941                         if (frametype == ROSE_CALL_REQUEST) {
 942                                 /* F6FBB - Remove an existing unused route */
 943                                 rose_remove_route(rose_route);
 944                                 break;
 945                         } else if (rose_route->neigh2 != NULL) {
 946                                 skb->data[0] &= 0xF0;
 947                                 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
 948                                 skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
 949                                 rose_transmit_link(skb, rose_route->neigh2);
 950                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 951                                         rose_remove_route(rose_route);
 952                                 res = 1;
 953                                 goto out;
 954                         } else {
 955                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 956                                         rose_remove_route(rose_route);
 957                                 goto out;
 958                         }
 959                 }
 960                 if (rose_route->lci2 == lci &&
 961                     rose_route->neigh2 == rose_neigh) {
 962                         if (frametype == ROSE_CALL_REQUEST) {
 963                                 /* F6FBB - Remove an existing unused route */
 964                                 rose_remove_route(rose_route);
 965                                 break;
 966                         } else if (rose_route->neigh1 != NULL) {
 967                                 skb->data[0] &= 0xF0;
 968                                 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
 969                                 skb->data[1]  = (rose_route->lci1 >> 0) & 0xFF;
 970                                 rose_transmit_link(skb, rose_route->neigh1);
 971                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 972                                         rose_remove_route(rose_route);
 973                                 res = 1;
 974                                 goto out;
 975                         } else {
 976                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 977                                         rose_remove_route(rose_route);
 978                                 goto out;
 979                         }
 980                 }
 981                 rose_route = rose_route->next;
 982         }
 983
 984         /*
 985          *      We know that:
 986          *      1. The frame isn't for us,
 987          *      2. It isn't "owned" by any existing route.
 988          */
 989         if (frametype != ROSE_CALL_REQUEST) {   /* XXX */
 990                 res = 0;
 991                 goto out;
 992         }
 993
 994         len  = (((skb->data[3] >> 4) & 0x0F) + 1) / 2;
 995         len += (((skb->data[3] >> 0) & 0x0F) + 1) / 2;
 996
 997         memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
 998
 999         if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
1000                 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1001                 goto out;
1002         }
1003
1004         /*
1005          *      Check for routing loops.
1006          */
1007         rose_route = rose_route_list;
1008         while (rose_route != NULL) {
1009                 if (rose_route->rand == facilities.rand &&
1010                     rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1011                     ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1012                     ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1013                         rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1014                         goto out;
1015                 }
1016                 rose_route = rose_route->next;
1017         }
1018
1019         if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == NULL) {
1020                 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1021                 goto out;
1022         }
1023
1024         if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1025                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1026                 goto out;
1027         }
1028
1029         if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1030                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1031                 goto out;
1032         }
1033
1034         rose_route->lci1      = lci;
1035         rose_route->src_addr  = *src_addr;
1036         rose_route->dest_addr = *dest_addr;
1037         rose_route->src_call  = facilities.dest_call;
1038         rose_route->dest_call = facilities.source_call;
1039         rose_route->rand      = facilities.rand;
1040         rose_route->neigh1    = rose_neigh;
1041         rose_route->lci2      = new_lci;
1042         rose_route->neigh2    = new_neigh;
1043
1044         rose_route->neigh1->use++;
1045         rose_route->neigh2->use++;
1046
1047         rose_route->next = rose_route_list;
1048         rose_route_list  = rose_route;
1049
1050         skb->data[0] &= 0xF0;
1051         skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1052         skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
1053
1054         rose_transmit_link(skb, rose_route->neigh2);
1055         res = 1;
1056
1057 out:
1058         spin_unlock_bh(&rose_route_list_lock);
1059         spin_unlock_bh(&rose_neigh_list_lock);
1060         spin_unlock_bh(&rose_node_list_lock);
1061
1062         return res;
1063 }
1064
1065 #ifdef CONFIG_PROC_FS
1066
1067 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1068 {
1069         struct rose_node *rose_node;
1070         int i = 1;
1071
1072         spin_lock_bh(&rose_neigh_list_lock);
1073         if (*pos == 0)
1074                 return SEQ_START_TOKEN;
1075
1076         for (rose_node = rose_node_list; rose_node && i < *pos;
1077              rose_node = rose_node->next, ++i);
1078
1079         return (i == *pos) ? rose_node : NULL;
1080 }
1081
1082 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1083 {
1084         ++*pos;
1085
1086         return (v == SEQ_START_TOKEN) ? rose_node_list
1087                 : ((struct rose_node *)v)->next;
1088 }
1089
1090 static void rose_node_stop(struct seq_file *seq, void *v)
1091 {
1092         spin_unlock_bh(&rose_neigh_list_lock);
1093 }
1094
1095 static int rose_node_show(struct seq_file *seq, void *v)
1096 {
1097         int i;
1098
1099         if (v == SEQ_START_TOKEN)
1100                 seq_puts(seq, "address    mask n neigh neigh neigh\n");
1101         else {
1102                 const struct rose_node *rose_node = v;
1103                 /* if (rose_node->loopback) {
1104                         seq_printf(seq, "%-10s %04d 1 loopback\n",
1105                                 rose2asc(&rose_node->address),
1106                                 rose_node->mask);
1107                 } else { */
1108                         seq_printf(seq, "%-10s %04d %d",
1109                                 rose2asc(&rose_node->address),
1110                                 rose_node->mask,
1111                                 rose_node->count);
1112
1113                         for (i = 0; i < rose_node->count; i++)
1114                                 seq_printf(seq, " %05d",
1115                                         rose_node->neighbour[i]->number);
1116
1117                         seq_puts(seq, "\n");
1118                 /* } */
1119         }
1120         return 0;
1121 }
1122
1123 static struct seq_operations rose_node_seqops = {
1124         .start = rose_node_start,
1125         .next = rose_node_next,
1126         .stop = rose_node_stop,
1127         .show = rose_node_show,
1128 };
1129
1130 static int rose_nodes_open(struct inode *inode, struct file *file)
1131 {
1132         return seq_open(file, &rose_node_seqops);
1133 }
1134
1135 struct file_operations rose_nodes_fops = {
1136         .owner = THIS_MODULE,
1137         .open = rose_nodes_open,
1138         .read = seq_read,
1139         .llseek = seq_lseek,
1140         .release = seq_release,
1141 };
1142
1143 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1144 {
1145         struct rose_neigh *rose_neigh;
1146         int i = 1;
1147
1148         spin_lock_bh(&rose_neigh_list_lock);
1149         if (*pos == 0)
1150                 return SEQ_START_TOKEN;
1151
1152         for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1153              rose_neigh = rose_neigh->next, ++i);
1154
1155         return (i == *pos) ? rose_neigh : NULL;
1156 }
1157
1158 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1159 {
1160         ++*pos;
1161
1162         return (v == SEQ_START_TOKEN) ? rose_neigh_list
1163                 : ((struct rose_neigh *)v)->next;
1164 }
1165
1166 static void rose_neigh_stop(struct seq_file *seq, void *v)
1167 {
1168         spin_unlock_bh(&rose_neigh_list_lock);
1169 }
1170
1171 static int rose_neigh_show(struct seq_file *seq, void *v)
1172 {
1173         char buf[11];
1174         int i;
1175
1176         if (v == SEQ_START_TOKEN)
1177                 seq_puts(seq,
1178                          "addr  callsign  dev  count use mode restart  t0  tf digipeaters\n");
1179         else {
1180                 struct rose_neigh *rose_neigh = v;
1181
1182                 /* if (!rose_neigh->loopback) { */
1183                 seq_printf(seq, "%05d %-9s %-4s   %3d %3d  %3s     %3s %3lu %3lu",
1184                            rose_neigh->number,
1185                            (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1186                            rose_neigh->dev ? rose_neigh->dev->name : "???",
1187                            rose_neigh->count,
1188                            rose_neigh->use,
1189                            (rose_neigh->dce_mode) ? "DCE" : "DTE",
1190                            (rose_neigh->restarted) ? "yes" : "no",
1191                            ax25_display_timer(&rose_neigh->t0timer) / HZ,
1192                            ax25_display_timer(&rose_neigh->ftimer)  / HZ);
1193
1194                 if (rose_neigh->digipeat != NULL) {
1195                         for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1196                                 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1197                 }
1198
1199                 seq_puts(seq, "\n");
1200         }
1201         return 0;
1202 }
1203
1204
1205 static struct seq_operations rose_neigh_seqops = {
1206         .start = rose_neigh_start,
1207         .next = rose_neigh_next,
1208         .stop = rose_neigh_stop,
1209         .show = rose_neigh_show,
1210 };
1211
1212 static int rose_neigh_open(struct inode *inode, struct file *file)
1213 {
1214         return seq_open(file, &rose_neigh_seqops);
1215 }
1216
1217 struct file_operations rose_neigh_fops = {
1218         .owner = THIS_MODULE,
1219         .open = rose_neigh_open,
1220         .read = seq_read,
1221         .llseek = seq_lseek,
1222         .release = seq_release,
1223 };
1224
1225
1226 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1227 {
1228         struct rose_route *rose_route;
1229         int i = 1;
1230
1231         spin_lock_bh(&rose_route_list_lock);
1232         if (*pos == 0)
1233                 return SEQ_START_TOKEN;
1234
1235         for (rose_route = rose_route_list; rose_route && i < *pos;
1236              rose_route = rose_route->next, ++i);
1237
1238         return (i == *pos) ? rose_route : NULL;
1239 }
1240
1241 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1242 {
1243         ++*pos;
1244
1245         return (v == SEQ_START_TOKEN) ? rose_route_list
1246                 : ((struct rose_route *)v)->next;
1247 }
1248
1249 static void rose_route_stop(struct seq_file *seq, void *v)
1250 {
1251         spin_unlock_bh(&rose_route_list_lock);
1252 }
1253
1254 static int rose_route_show(struct seq_file *seq, void *v)
1255 {
1256         char buf[11];
1257
1258         if (v == SEQ_START_TOKEN)
1259                 seq_puts(seq,
1260                          "lci  address     callsign   neigh  <-> lci  address     callsign   neigh\n");
1261         else {
1262                 struct rose_route *rose_route = v;
1263
1264                 if (rose_route->neigh1)
1265                         seq_printf(seq,
1266                                    "%3.3X  %-10s  %-9s  %05d      ",
1267                                    rose_route->lci1,
1268                                    rose2asc(&rose_route->src_addr),
1269                                    ax2asc(buf, &rose_route->src_call),
1270                                    rose_route->neigh1->number);
1271                 else
1272                         seq_puts(seq,
1273                                  "000  *           *          00000      ");
1274
1275                 if (rose_route->neigh2)
1276                         seq_printf(seq,
1277                                    "%3.3X  %-10s  %-9s  %05d\n",
1278                                 rose_route->lci2,
1279                                 rose2asc(&rose_route->dest_addr),
1280                                 ax2asc(buf, &rose_route->dest_call),
1281                                 rose_route->neigh2->number);
1282                  else
1283                          seq_puts(seq,
1284                                   "000  *           *          00000\n");
1285                 }
1286         return 0;
1287 }
1288
1289 static struct seq_operations rose_route_seqops = {
1290         .start = rose_route_start,
1291         .next = rose_route_next,
1292         .stop = rose_route_stop,
1293         .show = rose_route_show,
1294 };
1295
1296 static int rose_route_open(struct inode *inode, struct file *file)
1297 {
1298         return seq_open(file, &rose_route_seqops);
1299 }
1300
1301 struct file_operations rose_routes_fops = {
1302         .owner = THIS_MODULE,
1303         .open = rose_route_open,
1304         .read = seq_read,
1305         .llseek = seq_lseek,
1306         .release = seq_release,
1307 };
1308
1309 #endif /* CONFIG_PROC_FS */
1310
1311 /*
1312  *      Release all memory associated with ROSE routing structures.
1313  */
1314 void __exit rose_rt_free(void)
1315 {
1316         struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1317         struct rose_node  *t, *rose_node  = rose_node_list;
1318         struct rose_route *u, *rose_route = rose_route_list;
1319
1320         while (rose_neigh != NULL) {
1321                 s          = rose_neigh;
1322                 rose_neigh = rose_neigh->next;
1323
1324                 rose_remove_neigh(s);
1325         }
1326
1327         while (rose_node != NULL) {
1328                 t         = rose_node;
1329                 rose_node = rose_node->next;
1330
1331                 rose_remove_node(t);
1332         }
1333
1334         while (rose_route != NULL) {
1335                 u          = rose_route;
1336                 rose_route = rose_route->next;
1337
1338                 rose_remove_route(u);
1339         }
1340 }