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 __must_check 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 void rose_add_loopback_neigh(void)
 365 {
 366         struct rose_neigh *sn = &rose_loopback_neigh;
 367
 368         sn->callsign  = null_ax25_address;
 369         sn->digipeat  = NULL;
 370         sn->ax25      = NULL;
 371         sn->dev       = NULL;
 372         sn->count     = 0;
 373         sn->use       = 0;
 374         sn->dce_mode  = 1;
 375         sn->loopback  = 1;
 376         sn->number    = rose_neigh_no++;
 377         sn->restarted = 1;
 378
 379         skb_queue_head_init(&sn->queue);
 380
 381         init_timer(&sn->ftimer);
 382         init_timer(&sn->t0timer);
 383
 384         spin_lock_bh(&rose_neigh_list_lock);
 385         sn->next = rose_neigh_list;
 386         rose_neigh_list           = sn;
 387         spin_unlock_bh(&rose_neigh_list_lock);
 388 }
 389
 390 /*
 391  *      Add a loopback node.
 392  */
 393 int rose_add_loopback_node(rose_address *address)
 394 {
 395         struct rose_node *rose_node;
 396         int err = 0;
 397
 398         spin_lock_bh(&rose_node_list_lock);
 399
 400         rose_node = rose_node_list;
 401         while (rose_node != NULL) {
 402                 if ((rose_node->mask == 10) &&
 403                      (rosecmpm(address, &rose_node->address, 10) == 0) &&
 404                      rose_node->loopback)
 405                         break;
 406                 rose_node = rose_node->next;
 407         }
 408
 409         if (rose_node != NULL)
 410                 goto out;
 411
 412         if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
 413                 err = -ENOMEM;
 414                 goto out;
 415         }
 416
 417         rose_node->address      = *address;
 418         rose_node->mask         = 10;
 419         rose_node->count        = 1;
 420         rose_node->loopback     = 1;
 421         rose_node->neighbour[0] = &rose_loopback_neigh;
 422
 423         /* Insert at the head of list. Address is always mask=10 */
 424         rose_node->next = rose_node_list;
 425         rose_node_list  = rose_node;
 426
 427         rose_loopback_neigh.count++;
 428
 429 out:
 430         spin_unlock_bh(&rose_node_list_lock);
 431
 432         return err;
 433 }
 434
 435 /*
 436  *      Delete a loopback node.
 437  */
 438 void rose_del_loopback_node(rose_address *address)
 439 {
 440         struct rose_node *rose_node;
 441
 442         spin_lock_bh(&rose_node_list_lock);
 443
 444         rose_node = rose_node_list;
 445         while (rose_node != NULL) {
 446                 if ((rose_node->mask == 10) &&
 447                     (rosecmpm(address, &rose_node->address, 10) == 0) &&
 448                     rose_node->loopback)
 449                         break;
 450                 rose_node = rose_node->next;
 451         }
 452
 453         if (rose_node == NULL)
 454                 goto out;
 455
 456         rose_remove_node(rose_node);
 457
 458         rose_loopback_neigh.count--;
 459
 460 out:
 461         spin_unlock_bh(&rose_node_list_lock);
 462 }
 463
 464 /*
 465  *      A device has been removed. Remove its routes and neighbours.
 466  */
 467 void rose_rt_device_down(struct net_device *dev)
 468 {
 469         struct rose_neigh *s, *rose_neigh;
 470         struct rose_node  *t, *rose_node;
 471         int i;
 472
 473         spin_lock_bh(&rose_node_list_lock);
 474         spin_lock_bh(&rose_neigh_list_lock);
 475         rose_neigh = rose_neigh_list;
 476         while (rose_neigh != NULL) {
 477                 s          = rose_neigh;
 478                 rose_neigh = rose_neigh->next;
 479
 480                 if (s->dev != dev)
 481                         continue;
 482
 483                 rose_node = rose_node_list;
 484
 485                 while (rose_node != NULL) {
 486                         t         = rose_node;
 487                         rose_node = rose_node->next;
 488
 489                         for (i = 0; i < t->count; i++) {
 490                                 if (t->neighbour[i] != s)
 491                                         continue;
 492
 493                                 t->count--;
 494
 495                                 switch (i) {
 496                                 case 0:
 497                                         t->neighbour[0] = t->neighbour[1];
 498                                 case 1:
 499                                         t->neighbour[1] = t->neighbour[2];
 500                                 case 2:
 501                                         break;
 502                                 }
 503                         }
 504
 505                         if (t->count <= 0)
 506                                 rose_remove_node(t);
 507                 }
 508
 509                 rose_remove_neigh(s);
 510         }
 511         spin_unlock_bh(&rose_neigh_list_lock);
 512         spin_unlock_bh(&rose_node_list_lock);
 513 }
 514
 515 #if 0 /* Currently unused */
 516 /*
 517  *      A device has been removed. Remove its links.
 518  */
 519 void rose_route_device_down(struct net_device *dev)
 520 {
 521         struct rose_route *s, *rose_route;
 522
 523         spin_lock_bh(&rose_route_list_lock);
 524         rose_route = rose_route_list;
 525         while (rose_route != NULL) {
 526                 s          = rose_route;
 527                 rose_route = rose_route->next;
 528
 529                 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
 530                         rose_remove_route(s);
 531         }
 532         spin_unlock_bh(&rose_route_list_lock);
 533 }
 534 #endif
 535
 536 /*
 537  *      Clear all nodes and neighbours out, except for neighbours with
 538  *      active connections going through them.
 539  *  Do not clear loopback neighbour and nodes.
 540  */
 541 static int rose_clear_routes(void)
 542 {
 543         struct rose_neigh *s, *rose_neigh;
 544         struct rose_node  *t, *rose_node;
 545
 546         spin_lock_bh(&rose_node_list_lock);
 547         spin_lock_bh(&rose_neigh_list_lock);
 548
 549         rose_neigh = rose_neigh_list;
 550         rose_node  = rose_node_list;
 551
 552         while (rose_node != NULL) {
 553                 t         = rose_node;
 554                 rose_node = rose_node->next;
 555                 if (!t->loopback)
 556                         rose_remove_node(t);
 557         }
 558
 559         while (rose_neigh != NULL) {
 560                 s          = rose_neigh;
 561                 rose_neigh = rose_neigh->next;
 562
 563                 if (s->use == 0 && !s->loopback) {
 564                         s->count = 0;
 565                         rose_remove_neigh(s);
 566                 }
 567         }
 568
 569         spin_unlock_bh(&rose_neigh_list_lock);
 570         spin_unlock_bh(&rose_node_list_lock);
 571
 572         return 0;
 573 }
 574
 575 /*
 576  *      Check that the device given is a valid AX.25 interface that is "up".
 577  */
 578 static struct net_device *rose_ax25_dev_get(char *devname)
 579 {
 580         struct net_device *dev;
 581
 582         if ((dev = dev_get_by_name(devname)) == NULL)
 583                 return NULL;
 584
 585         if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
 586                 return dev;
 587
 588         dev_put(dev);
 589         return NULL;
 590 }
 591
 592 /*
 593  *      Find the first active ROSE device, usually "rose0".
 594  */
 595 struct net_device *rose_dev_first(void)
 596 {
 597         struct net_device *dev, *first = NULL;
 598
 599         read_lock(&dev_base_lock);
 600         for (dev = dev_base; dev != NULL; dev = dev->next) {
 601                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
 602                         if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
 603                                 first = dev;
 604         }
 605         read_unlock(&dev_base_lock);
 606
 607         return first;
 608 }
 609
 610 /*
 611  *      Find the ROSE device for the given address.
 612  */
 613 struct net_device *rose_dev_get(rose_address *addr)
 614 {
 615         struct net_device *dev;
 616
 617         read_lock(&dev_base_lock);
 618         for (dev = dev_base; dev != NULL; dev = dev->next) {
 619                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
 620                         dev_hold(dev);
 621                         goto out;
 622                 }
 623         }
 624 out:
 625         read_unlock(&dev_base_lock);
 626         return dev;
 627 }
 628
 629 static int rose_dev_exists(rose_address *addr)
 630 {
 631         struct net_device *dev;
 632
 633         read_lock(&dev_base_lock);
 634         for (dev = dev_base; dev != NULL; dev = dev->next) {
 635                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
 636                         goto out;
 637         }
 638 out:
 639         read_unlock(&dev_base_lock);
 640         return dev != NULL;
 641 }
 642
 643
 644
 645
 646 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
 647 {
 648         struct rose_route *rose_route;
 649
 650         for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
 651                 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
 652                     (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
 653                         return rose_route;
 654
 655         return NULL;
 656 }
 657
 658 /*
 659  *      Find a neighbour given a ROSE address.
 660  */
 661 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
 662         unsigned char *diagnostic)
 663 {
 664         struct rose_neigh *res = NULL;
 665         struct rose_node *node;
 666         int failed = 0;
 667         int i;
 668
 669         spin_lock_bh(&rose_node_list_lock);
 670         for (node = rose_node_list; node != NULL; node = node->next) {
 671                 if (rosecmpm(addr, &node->address, node->mask) == 0) {
 672                         for (i = 0; i < node->count; i++) {
 673                                 if (!rose_ftimer_running(node->neighbour[i])) {
 674                                         res = node->neighbour[i];
 675                                         goto out;
 676                                 } else
 677                                         failed = 1;
 678                         }
 679                         break;
 680                 }
 681         }
 682
 683         if (failed) {
 684                 *cause      = ROSE_OUT_OF_ORDER;
 685                 *diagnostic = 0;
 686         } else {
 687                 *cause      = ROSE_NOT_OBTAINABLE;
 688                 *diagnostic = 0;
 689         }
 690
 691 out:
 692         spin_unlock_bh(&rose_node_list_lock);
 693
 694         return res;
 695 }
 696
 697 /*
 698  *      Handle the ioctls that control the routing functions.
 699  */
 700 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
 701 {
 702         struct rose_route_struct rose_route;
 703         struct net_device *dev;
 704         int err;
 705
 706         switch (cmd) {
 707         case SIOCADDRT:
 708                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 709                         return -EFAULT;
 710                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 711                         return -EINVAL;
 712                 if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
 713                         dev_put(dev);
 714                         return -EINVAL;
 715                 }
 716                 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
 717                         return -EINVAL;
 718                 if (rose_route.ndigis > AX25_MAX_DIGIS)
 719                         return -EINVAL;
 720                 err = rose_add_node(&rose_route, dev);
 721                 dev_put(dev);
 722                 return err;
 723
 724         case SIOCDELRT:
 725                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 726                         return -EFAULT;
 727                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 728                         return -EINVAL;
 729                 err = rose_del_node(&rose_route, dev);
 730                 dev_put(dev);
 731                 return err;
 732
 733         case SIOCRSCLRRT:
 734                 return rose_clear_routes();
 735
 736         default:
 737                 return -EINVAL;
 738         }
 739
 740         return 0;
 741 }
 742
 743 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
 744 {
 745         struct rose_route *rose_route, *s;
 746
 747         rose_neigh->restarted = 0;
 748
 749         rose_stop_t0timer(rose_neigh);
 750         rose_start_ftimer(rose_neigh);
 751
 752         skb_queue_purge(&rose_neigh->queue);
 753
 754         spin_lock_bh(&rose_route_list_lock);
 755
 756         rose_route = rose_route_list;
 757
 758         while (rose_route != NULL) {
 759                 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
 760                     (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL)       ||
 761                     (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
 762                         s = rose_route->next;
 763                         rose_remove_route(rose_route);
 764                         rose_route = s;
 765                         continue;
 766                 }
 767
 768                 if (rose_route->neigh1 == rose_neigh) {
 769                         rose_route->neigh1->use--;
 770                         rose_route->neigh1 = NULL;
 771                         rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
 772                 }
 773
 774                 if (rose_route->neigh2 == rose_neigh) {
 775                         rose_route->neigh2->use--;
 776                         rose_route->neigh2 = NULL;
 777                         rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
 778                 }
 779
 780                 rose_route = rose_route->next;
 781         }
 782         spin_unlock_bh(&rose_route_list_lock);
 783 }
 784
 785 /*
 786  *      A level 2 link has timed out, therefore it appears to be a poor link,
 787  *      then don't use that neighbour until it is reset. Blow away all through
 788  *      routes and connections using this route.
 789  */
 790 void rose_link_failed(ax25_cb *ax25, int reason)
 791 {
 792         struct rose_neigh *rose_neigh;
 793
 794         spin_lock_bh(&rose_neigh_list_lock);
 795         rose_neigh = rose_neigh_list;
 796         while (rose_neigh != NULL) {
 797                 if (rose_neigh->ax25 == ax25)
 798                         break;
 799                 rose_neigh = rose_neigh->next;
 800         }
 801
 802         if (rose_neigh != NULL) {
 803                 rose_neigh->ax25 = NULL;
 804
 805                 rose_del_route_by_neigh(rose_neigh);
 806                 rose_kill_by_neigh(rose_neigh);
 807         }
 808         spin_unlock_bh(&rose_neigh_list_lock);
 809 }
 810
 811 /*
 812  *      A device has been "downed" remove its link status. Blow away all
 813  *      through routes and connections that use this device.
 814  */
 815 void rose_link_device_down(struct net_device *dev)
 816 {
 817         struct rose_neigh *rose_neigh;
 818
 819         for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
 820                 if (rose_neigh->dev == dev) {
 821                         rose_del_route_by_neigh(rose_neigh);
 822                         rose_kill_by_neigh(rose_neigh);
 823                 }
 824         }
 825 }
 826
 827 /*
 828  *      Route a frame to an appropriate AX.25 connection.
 829  */
 830 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
 831 {
 832         struct rose_neigh *rose_neigh, *new_neigh;
 833         struct rose_route *rose_route;
 834         struct rose_facilities_struct facilities;
 835         rose_address *src_addr, *dest_addr;
 836         struct sock *sk;
 837         unsigned short frametype;
 838         unsigned int lci, new_lci;
 839         unsigned char cause, diagnostic;
 840         struct net_device *dev;
 841         int len, res = 0;
 842         char buf[11];
 843
 844 #if 0
 845         if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
 846                 return res;
 847 #endif
 848
 849         frametype = skb->data[2];
 850         lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
 851         src_addr  = (rose_address *)(skb->data + 9);
 852         dest_addr = (rose_address *)(skb->data + 4);
 853
 854         spin_lock_bh(&rose_node_list_lock);
 855         spin_lock_bh(&rose_neigh_list_lock);
 856         spin_lock_bh(&rose_route_list_lock);
 857
 858         rose_neigh = rose_neigh_list;
 859         while (rose_neigh != NULL) {
 860                 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
 861                     ax25->ax25_dev->dev == rose_neigh->dev)
 862                         break;
 863                 rose_neigh = rose_neigh->next;
 864         }
 865
 866         if (rose_neigh == NULL) {
 867                 printk("rose_route : unknown neighbour or device %s\n",
 868                        ax2asc(buf, &ax25->dest_addr));
 869                 goto out;
 870         }
 871
 872         /*
 873          *      Obviously the link is working, halt the ftimer.
 874          */
 875         rose_stop_ftimer(rose_neigh);
 876
 877         /*
 878          *      LCI of zero is always for us, and its always a restart
 879          *      frame.
 880          */
 881         if (lci == 0) {
 882                 rose_link_rx_restart(skb, rose_neigh, frametype);
 883                 goto out;
 884         }
 885
 886         /*
 887          *      Find an existing socket.
 888          */
 889         if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
 890                 if (frametype == ROSE_CALL_REQUEST) {
 891                         struct rose_sock *rose = rose_sk(sk);
 892
 893                         /* Remove an existing unused socket */
 894                         rose_clear_queues(sk);
 895                         rose->cause      = ROSE_NETWORK_CONGESTION;
 896                         rose->diagnostic = 0;
 897                         rose->neighbour->use--;
 898                         rose->neighbour  = NULL;
 899                         rose->lci        = 0;
 900                         rose->state      = ROSE_STATE_0;
 901                         sk->sk_state     = TCP_CLOSE;
 902                         sk->sk_err       = 0;
 903                         sk->sk_shutdown  |= SEND_SHUTDOWN;
 904                         if (!sock_flag(sk, SOCK_DEAD)) {
 905                                 sk->sk_state_change(sk);
 906                                 sock_set_flag(sk, SOCK_DEAD);
 907                         }
 908                 }
 909                 else {
 910                         skb->h.raw = skb->data;
 911                         res = rose_process_rx_frame(sk, skb);
 912                         goto out;
 913                 }
 914         }
 915
 916         /*
 917          *      Is is a Call Request and is it for us ?
 918          */
 919         if (frametype == ROSE_CALL_REQUEST)
 920                 if ((dev = rose_dev_get(dest_addr)) != NULL) {
 921                         res = rose_rx_call_request(skb, dev, rose_neigh, lci);
 922                         dev_put(dev);
 923                         goto out;
 924                 }
 925
 926         if (!sysctl_rose_routing_control) {
 927                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
 928                 goto out;
 929         }
 930
 931         /*
 932          *      Route it to the next in line if we have an entry for it.
 933          */
 934         rose_route = rose_route_list;
 935         while (rose_route != NULL) {
 936                 if (rose_route->lci1 == lci &&
 937                     rose_route->neigh1 == rose_neigh) {
 938                         if (frametype == ROSE_CALL_REQUEST) {
 939                                 /* F6FBB - Remove an existing unused route */
 940                                 rose_remove_route(rose_route);
 941                                 break;
 942                         } else if (rose_route->neigh2 != NULL) {
 943                                 skb->data[0] &= 0xF0;
 944                                 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
 945                                 skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
 946                                 rose_transmit_link(skb, rose_route->neigh2);
 947                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 948                                         rose_remove_route(rose_route);
 949                                 res = 1;
 950                                 goto out;
 951                         } else {
 952                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 953                                         rose_remove_route(rose_route);
 954                                 goto out;
 955                         }
 956                 }
 957                 if (rose_route->lci2 == lci &&
 958                     rose_route->neigh2 == rose_neigh) {
 959                         if (frametype == ROSE_CALL_REQUEST) {
 960                                 /* F6FBB - Remove an existing unused route */
 961                                 rose_remove_route(rose_route);
 962                                 break;
 963                         } else if (rose_route->neigh1 != NULL) {
 964                                 skb->data[0] &= 0xF0;
 965                                 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
 966                                 skb->data[1]  = (rose_route->lci1 >> 0) & 0xFF;
 967                                 rose_transmit_link(skb, rose_route->neigh1);
 968                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 969                                         rose_remove_route(rose_route);
 970                                 res = 1;
 971                                 goto out;
 972                         } else {
 973                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 974                                         rose_remove_route(rose_route);
 975                                 goto out;
 976                         }
 977                 }
 978                 rose_route = rose_route->next;
 979         }
 980
 981         /*
 982          *      We know that:
 983          *      1. The frame isn't for us,
 984          *      2. It isn't "owned" by any existing route.
 985          */
 986         if (frametype != ROSE_CALL_REQUEST) {   /* XXX */
 987                 res = 0;
 988                 goto out;
 989         }
 990
 991         len  = (((skb->data[3] >> 4) & 0x0F) + 1) / 2;
 992         len += (((skb->data[3] >> 0) & 0x0F) + 1) / 2;
 993
 994         memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
 995
 996         if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
 997                 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
 998                 goto out;
 999         }
1000
1001         /*
1002          *      Check for routing loops.
1003          */
1004         rose_route = rose_route_list;
1005         while (rose_route != NULL) {
1006                 if (rose_route->rand == facilities.rand &&
1007                     rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1008                     ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1009                     ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1010                         rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1011                         goto out;
1012                 }
1013                 rose_route = rose_route->next;
1014         }
1015
1016         if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == NULL) {
1017                 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1018                 goto out;
1019         }
1020
1021         if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1022                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1023                 goto out;
1024         }
1025
1026         if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1027                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1028                 goto out;
1029         }
1030
1031         rose_route->lci1      = lci;
1032         rose_route->src_addr  = *src_addr;
1033         rose_route->dest_addr = *dest_addr;
1034         rose_route->src_call  = facilities.dest_call;
1035         rose_route->dest_call = facilities.source_call;
1036         rose_route->rand      = facilities.rand;
1037         rose_route->neigh1    = rose_neigh;
1038         rose_route->lci2      = new_lci;
1039         rose_route->neigh2    = new_neigh;
1040
1041         rose_route->neigh1->use++;
1042         rose_route->neigh2->use++;
1043
1044         rose_route->next = rose_route_list;
1045         rose_route_list  = rose_route;
1046
1047         skb->data[0] &= 0xF0;
1048         skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1049         skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
1050
1051         rose_transmit_link(skb, rose_route->neigh2);
1052         res = 1;
1053
1054 out:
1055         spin_unlock_bh(&rose_route_list_lock);
1056         spin_unlock_bh(&rose_neigh_list_lock);
1057         spin_unlock_bh(&rose_node_list_lock);
1058
1059         return res;
1060 }
1061
1062 #ifdef CONFIG_PROC_FS
1063
1064 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1065 {
1066         struct rose_node *rose_node;
1067         int i = 1;
1068
1069         spin_lock_bh(&rose_neigh_list_lock);
1070         if (*pos == 0)
1071                 return SEQ_START_TOKEN;
1072
1073         for (rose_node = rose_node_list; rose_node && i < *pos;
1074              rose_node = rose_node->next, ++i);
1075
1076         return (i == *pos) ? rose_node : NULL;
1077 }
1078
1079 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1080 {
1081         ++*pos;
1082
1083         return (v == SEQ_START_TOKEN) ? rose_node_list
1084                 : ((struct rose_node *)v)->next;
1085 }
1086
1087 static void rose_node_stop(struct seq_file *seq, void *v)
1088 {
1089         spin_unlock_bh(&rose_neigh_list_lock);
1090 }
1091
1092 static int rose_node_show(struct seq_file *seq, void *v)
1093 {
1094         int i;
1095
1096         if (v == SEQ_START_TOKEN)
1097                 seq_puts(seq, "address    mask n neigh neigh neigh\n");
1098         else {
1099                 const struct rose_node *rose_node = v;
1100                 /* if (rose_node->loopback) {
1101                         seq_printf(seq, "%-10s %04d 1 loopback\n",
1102                                 rose2asc(&rose_node->address),
1103                                 rose_node->mask);
1104                 } else { */
1105                         seq_printf(seq, "%-10s %04d %d",
1106                                 rose2asc(&rose_node->address),
1107                                 rose_node->mask,
1108                                 rose_node->count);
1109
1110                         for (i = 0; i < rose_node->count; i++)
1111                                 seq_printf(seq, " %05d",
1112                                         rose_node->neighbour[i]->number);
1113
1114                         seq_puts(seq, "\n");
1115                 /* } */
1116         }
1117         return 0;
1118 }
1119
1120 static struct seq_operations rose_node_seqops = {
1121         .start = rose_node_start,
1122         .next = rose_node_next,
1123         .stop = rose_node_stop,
1124         .show = rose_node_show,
1125 };
1126
1127 static int rose_nodes_open(struct inode *inode, struct file *file)
1128 {
1129         return seq_open(file, &rose_node_seqops);
1130 }
1131
1132 struct file_operations rose_nodes_fops = {
1133         .owner = THIS_MODULE,
1134         .open = rose_nodes_open,
1135         .read = seq_read,
1136         .llseek = seq_lseek,
1137         .release = seq_release,
1138 };
1139
1140 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1141 {
1142         struct rose_neigh *rose_neigh;
1143         int i = 1;
1144
1145         spin_lock_bh(&rose_neigh_list_lock);
1146         if (*pos == 0)
1147                 return SEQ_START_TOKEN;
1148
1149         for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1150              rose_neigh = rose_neigh->next, ++i);
1151
1152         return (i == *pos) ? rose_neigh : NULL;
1153 }
1154
1155 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1156 {
1157         ++*pos;
1158
1159         return (v == SEQ_START_TOKEN) ? rose_neigh_list
1160                 : ((struct rose_neigh *)v)->next;
1161 }
1162
1163 static void rose_neigh_stop(struct seq_file *seq, void *v)
1164 {
1165         spin_unlock_bh(&rose_neigh_list_lock);
1166 }
1167
1168 static int rose_neigh_show(struct seq_file *seq, void *v)
1169 {
1170         char buf[11];
1171         int i;
1172
1173         if (v == SEQ_START_TOKEN)
1174                 seq_puts(seq,
1175                          "addr  callsign  dev  count use mode restart  t0  tf digipeaters\n");
1176         else {
1177                 struct rose_neigh *rose_neigh = v;
1178
1179                 /* if (!rose_neigh->loopback) { */
1180                 seq_printf(seq, "%05d %-9s %-4s   %3d %3d  %3s     %3s %3lu %3lu",
1181                            rose_neigh->number,
1182                            (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1183                            rose_neigh->dev ? rose_neigh->dev->name : "???",
1184                            rose_neigh->count,
1185                            rose_neigh->use,
1186                            (rose_neigh->dce_mode) ? "DCE" : "DTE",
1187                            (rose_neigh->restarted) ? "yes" : "no",
1188                            ax25_display_timer(&rose_neigh->t0timer) / HZ,
1189                            ax25_display_timer(&rose_neigh->ftimer)  / HZ);
1190
1191                 if (rose_neigh->digipeat != NULL) {
1192                         for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1193                                 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1194                 }
1195
1196                 seq_puts(seq, "\n");
1197         }
1198         return 0;
1199 }
1200
1201
1202 static struct seq_operations rose_neigh_seqops = {
1203         .start = rose_neigh_start,
1204         .next = rose_neigh_next,
1205         .stop = rose_neigh_stop,
1206         .show = rose_neigh_show,
1207 };
1208
1209 static int rose_neigh_open(struct inode *inode, struct file *file)
1210 {
1211         return seq_open(file, &rose_neigh_seqops);
1212 }
1213
1214 struct file_operations rose_neigh_fops = {
1215         .owner = THIS_MODULE,
1216         .open = rose_neigh_open,
1217         .read = seq_read,
1218         .llseek = seq_lseek,
1219         .release = seq_release,
1220 };
1221
1222
1223 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1224 {
1225         struct rose_route *rose_route;
1226         int i = 1;
1227
1228         spin_lock_bh(&rose_route_list_lock);
1229         if (*pos == 0)
1230                 return SEQ_START_TOKEN;
1231
1232         for (rose_route = rose_route_list; rose_route && i < *pos;
1233              rose_route = rose_route->next, ++i);
1234
1235         return (i == *pos) ? rose_route : NULL;
1236 }
1237
1238 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1239 {
1240         ++*pos;
1241
1242         return (v == SEQ_START_TOKEN) ? rose_route_list
1243                 : ((struct rose_route *)v)->next;
1244 }
1245
1246 static void rose_route_stop(struct seq_file *seq, void *v)
1247 {
1248         spin_unlock_bh(&rose_route_list_lock);
1249 }
1250
1251 static int rose_route_show(struct seq_file *seq, void *v)
1252 {
1253         char buf[11];
1254
1255         if (v == SEQ_START_TOKEN)
1256                 seq_puts(seq,
1257                          "lci  address     callsign   neigh  <-> lci  address     callsign   neigh\n");
1258         else {
1259                 struct rose_route *rose_route = v;
1260
1261                 if (rose_route->neigh1)
1262                         seq_printf(seq,
1263                                    "%3.3X  %-10s  %-9s  %05d      ",
1264                                    rose_route->lci1,
1265                                    rose2asc(&rose_route->src_addr),
1266                                    ax2asc(buf, &rose_route->src_call),
1267                                    rose_route->neigh1->number);
1268                 else
1269                         seq_puts(seq,
1270                                  "000  *           *          00000      ");
1271
1272                 if (rose_route->neigh2)
1273                         seq_printf(seq,
1274                                    "%3.3X  %-10s  %-9s  %05d\n",
1275                                 rose_route->lci2,
1276                                 rose2asc(&rose_route->dest_addr),
1277                                 ax2asc(buf, &rose_route->dest_call),
1278                                 rose_route->neigh2->number);
1279                  else
1280                          seq_puts(seq,
1281                                   "000  *           *          00000\n");
1282                 }
1283         return 0;
1284 }
1285
1286 static struct seq_operations rose_route_seqops = {
1287         .start = rose_route_start,
1288         .next = rose_route_next,
1289         .stop = rose_route_stop,
1290         .show = rose_route_show,
1291 };
1292
1293 static int rose_route_open(struct inode *inode, struct file *file)
1294 {
1295         return seq_open(file, &rose_route_seqops);
1296 }
1297
1298 struct file_operations rose_routes_fops = {
1299         .owner = THIS_MODULE,
1300         .open = rose_route_open,
1301         .read = seq_read,
1302         .llseek = seq_lseek,
1303         .release = seq_release,
1304 };
1305
1306 #endif /* CONFIG_PROC_FS */
1307
1308 /*
1309  *      Release all memory associated with ROSE routing structures.
1310  */
1311 void __exit rose_rt_free(void)
1312 {
1313         struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1314         struct rose_node  *t, *rose_node  = rose_node_list;
1315         struct rose_route *u, *rose_route = rose_route_list;
1316
1317         while (rose_neigh != NULL) {
1318                 s          = rose_neigh;
1319                 rose_neigh = rose_neigh->next;
1320
1321                 rose_remove_neigh(s);
1322         }
1323
1324         while (rose_node != NULL) {
1325                 t         = rose_node;
1326                 rose_node = rose_node->next;
1327
1328                 rose_remove_node(t);
1329         }
1330
1331         while (rose_route != NULL) {
1332                 u          = rose_route;
1333                 rose_route = rose_route->next;
1334
1335                 rose_remove_route(u);
1336         }
1337 }