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/timer.h>
  16 #include <linux/string.h>
  17 #include <linux/sockios.h>
  18 #include <linux/net.h>
  19 #include <net/ax25.h>
  20 #include <linux/inet.h>
  21 #include <linux/netdevice.h>
  22 #include <net/arp.h>
  23 #include <linux/if_arp.h>
  24 #include <linux/skbuff.h>
  25 #include <net/sock.h>
  26 #include <net/tcp_states.h>
  27 #include <asm/system.h>
  28 #include <asm/uaccess.h>
  29 #include <linux/fcntl.h>
  30 #include <linux/termios.h>      /* For TIOCINQ/OUTQ */
  31 #include <linux/mm.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/notifier.h>
  34 #include <linux/netfilter.h>
  35 #include <linux/init.h>
  36 #include <net/rose.h>
  37 #include <linux/seq_file.h>
  38
  39 static unsigned int rose_neigh_no = 1;
  40
  41 static struct rose_node  *rose_node_list;
  42 static DEFINE_SPINLOCK(rose_node_list_lock);
  43 static struct rose_neigh *rose_neigh_list;
  44 static DEFINE_SPINLOCK(rose_neigh_list_lock);
  45 static struct rose_route *rose_route_list;
  46 static DEFINE_SPINLOCK(rose_route_list_lock);
  47
  48 struct rose_neigh rose_loopback_neigh;
  49
  50 /*
  51  *      Add a new route to a node, and in the process add the node and the
  52  *      neighbour if it is new.
  53  */
  54 static int __must_check rose_add_node(struct rose_route_struct *rose_route,
  55         struct net_device *dev)
  56 {
  57         struct rose_node  *rose_node, *rose_tmpn, *rose_tmpp;
  58         struct rose_neigh *rose_neigh;
  59         int i, res = 0;
  60
  61         spin_lock_bh(&rose_node_list_lock);
  62         spin_lock_bh(&rose_neigh_list_lock);
  63
  64         rose_node = rose_node_list;
  65         while (rose_node != NULL) {
  66                 if ((rose_node->mask == rose_route->mask) &&
  67                     (rosecmpm(&rose_route->address, &rose_node->address,
  68                               rose_route->mask) == 0))
  69                         break;
  70                 rose_node = rose_node->next;
  71         }
  72
  73         if (rose_node != NULL && rose_node->loopback) {
  74                 res = -EINVAL;
  75                 goto out;
  76         }
  77
  78         rose_neigh = rose_neigh_list;
  79         while (rose_neigh != NULL) {
  80                 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
  81                     && rose_neigh->dev == dev)
  82                         break;
  83                 rose_neigh = rose_neigh->next;
  84         }
  85
  86         if (rose_neigh == NULL) {
  87                 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
  88                 if (rose_neigh == NULL) {
  89                         res = -ENOMEM;
  90                         goto out;
  91                 }
  92
  93                 rose_neigh->callsign  = rose_route->neighbour;
  94                 rose_neigh->digipeat  = NULL;
  95                 rose_neigh->ax25      = NULL;
  96                 rose_neigh->dev       = dev;
  97                 rose_neigh->count     = 0;
  98                 rose_neigh->use       = 0;
  99                 rose_neigh->dce_mode  = 0;
 100                 rose_neigh->loopback  = 0;
 101                 rose_neigh->number    = rose_neigh_no++;
 102                 rose_neigh->restarted = 0;
 103
 104                 skb_queue_head_init(&rose_neigh->queue);
 105
 106                 init_timer(&rose_neigh->ftimer);
 107                 init_timer(&rose_neigh->t0timer);
 108
 109                 if (rose_route->ndigis != 0) {
 110                         if ((rose_neigh->digipeat = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
 111                                 kfree(rose_neigh);
 112                                 res = -ENOMEM;
 113                                 goto out;
 114                         }
 115
 116                         rose_neigh->digipeat->ndigi      = rose_route->ndigis;
 117                         rose_neigh->digipeat->lastrepeat = -1;
 118
 119                         for (i = 0; i < rose_route->ndigis; i++) {
 120                                 rose_neigh->digipeat->calls[i]    =
 121                                         rose_route->digipeaters[i];
 122                                 rose_neigh->digipeat->repeated[i] = 0;
 123                         }
 124                 }
 125
 126                 rose_neigh->next = rose_neigh_list;
 127                 rose_neigh_list  = rose_neigh;
 128         }
 129
 130         /*
 131          * This is a new node to be inserted into the list. Find where it needs
 132          * to be inserted into the list, and insert it. We want to be sure
 133          * to order the list in descending order of mask size to ensure that
 134          * later when we are searching this list the first match will be the
 135          * best match.
 136          */
 137         if (rose_node == NULL) {
 138                 rose_tmpn = rose_node_list;
 139                 rose_tmpp = NULL;
 140
 141                 while (rose_tmpn != NULL) {
 142                         if (rose_tmpn->mask > rose_route->mask) {
 143                                 rose_tmpp = rose_tmpn;
 144                                 rose_tmpn = rose_tmpn->next;
 145                         } else {
 146                                 break;
 147                         }
 148                 }
 149
 150                 /* create new node */
 151                 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
 152                 if (rose_node == NULL) {
 153                         res = -ENOMEM;
 154                         goto out;
 155                 }
 156
 157                 rose_node->address      = rose_route->address;
 158                 rose_node->mask         = rose_route->mask;
 159                 rose_node->count        = 1;
 160                 rose_node->loopback     = 0;
 161                 rose_node->neighbour[0] = rose_neigh;
 162
 163                 if (rose_tmpn == NULL) {
 164                         if (rose_tmpp == NULL) {        /* Empty list */
 165                                 rose_node_list  = rose_node;
 166                                 rose_node->next = NULL;
 167                         } else {
 168                                 rose_tmpp->next = rose_node;
 169                                 rose_node->next = NULL;
 170                         }
 171                 } else {
 172                         if (rose_tmpp == NULL) {        /* 1st node */
 173                                 rose_node->next = rose_node_list;
 174                                 rose_node_list  = rose_node;
 175                         } else {
 176                                 rose_tmpp->next = rose_node;
 177                                 rose_node->next = rose_tmpn;
 178                         }
 179                 }
 180                 rose_neigh->count++;
 181
 182                 goto out;
 183         }
 184
 185         /* We have space, slot it in */
 186         if (rose_node->count < 3) {
 187                 rose_node->neighbour[rose_node->count] = rose_neigh;
 188                 rose_node->count++;
 189                 rose_neigh->count++;
 190         }
 191
 192 out:
 193         spin_unlock_bh(&rose_neigh_list_lock);
 194         spin_unlock_bh(&rose_node_list_lock);
 195
 196         return res;
 197 }
 198
 199 /*
 200  * Caller is holding rose_node_list_lock.
 201  */
 202 static void rose_remove_node(struct rose_node *rose_node)
 203 {
 204         struct rose_node *s;
 205
 206         if ((s = rose_node_list) == rose_node) {
 207                 rose_node_list = rose_node->next;
 208                 kfree(rose_node);
 209                 return;
 210         }
 211
 212         while (s != NULL && s->next != NULL) {
 213                 if (s->next == rose_node) {
 214                         s->next = rose_node->next;
 215                         kfree(rose_node);
 216                         return;
 217                 }
 218
 219                 s = s->next;
 220         }
 221 }
 222
 223 /*
 224  * Caller is holding rose_neigh_list_lock.
 225  */
 226 static void rose_remove_neigh(struct rose_neigh *rose_neigh)
 227 {
 228         struct rose_neigh *s;
 229
 230         rose_stop_ftimer(rose_neigh);
 231         rose_stop_t0timer(rose_neigh);
 232
 233         skb_queue_purge(&rose_neigh->queue);
 234
 235         if ((s = rose_neigh_list) == rose_neigh) {
 236                 rose_neigh_list = rose_neigh->next;
 237                 kfree(rose_neigh->digipeat);
 238                 kfree(rose_neigh);
 239                 return;
 240         }
 241
 242         while (s != NULL && s->next != NULL) {
 243                 if (s->next == rose_neigh) {
 244                         s->next = rose_neigh->next;
 245                         kfree(rose_neigh->digipeat);
 246                         kfree(rose_neigh);
 247                         return;
 248                 }
 249
 250                 s = s->next;
 251         }
 252 }
 253
 254 /*
 255  * Caller is holding rose_route_list_lock.
 256  */
 257 static void rose_remove_route(struct rose_route *rose_route)
 258 {
 259         struct rose_route *s;
 260
 261         if (rose_route->neigh1 != NULL)
 262                 rose_route->neigh1->use--;
 263
 264         if (rose_route->neigh2 != NULL)
 265                 rose_route->neigh2->use--;
 266
 267         if ((s = rose_route_list) == rose_route) {
 268                 rose_route_list = rose_route->next;
 269                 kfree(rose_route);
 270                 return;
 271         }
 272
 273         while (s != NULL && s->next != NULL) {
 274                 if (s->next == rose_route) {
 275                         s->next = rose_route->next;
 276                         kfree(rose_route);
 277                         return;
 278                 }
 279
 280                 s = s->next;
 281         }
 282 }
 283
 284 /*
 285  *      "Delete" a node. Strictly speaking remove a route to a node. The node
 286  *      is only deleted if no routes are left to it.
 287  */
 288 static int rose_del_node(struct rose_route_struct *rose_route,
 289         struct net_device *dev)
 290 {
 291         struct rose_node  *rose_node;
 292         struct rose_neigh *rose_neigh;
 293         int i, err = 0;
 294
 295         spin_lock_bh(&rose_node_list_lock);
 296         spin_lock_bh(&rose_neigh_list_lock);
 297
 298         rose_node = rose_node_list;
 299         while (rose_node != NULL) {
 300                 if ((rose_node->mask == rose_route->mask) &&
 301                     (rosecmpm(&rose_route->address, &rose_node->address,
 302                               rose_route->mask) == 0))
 303                         break;
 304                 rose_node = rose_node->next;
 305         }
 306
 307         if (rose_node == NULL || rose_node->loopback) {
 308                 err = -EINVAL;
 309                 goto out;
 310         }
 311
 312         rose_neigh = rose_neigh_list;
 313         while (rose_neigh != NULL) {
 314                 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
 315                     && rose_neigh->dev == dev)
 316                         break;
 317                 rose_neigh = rose_neigh->next;
 318         }
 319
 320         if (rose_neigh == NULL) {
 321                 err = -EINVAL;
 322                 goto out;
 323         }
 324
 325         for (i = 0; i < rose_node->count; i++) {
 326                 if (rose_node->neighbour[i] == rose_neigh) {
 327                         rose_neigh->count--;
 328
 329                         if (rose_neigh->count == 0 && rose_neigh->use == 0)
 330                                 rose_remove_neigh(rose_neigh);
 331
 332                         rose_node->count--;
 333
 334                         if (rose_node->count == 0) {
 335                                 rose_remove_node(rose_node);
 336                         } else {
 337                                 switch (i) {
 338                                 case 0:
 339                                         rose_node->neighbour[0] =
 340                                                 rose_node->neighbour[1];
 341                                 case 1:
 342                                         rose_node->neighbour[1] =
 343                                                 rose_node->neighbour[2];
 344                                 case 2:
 345                                         break;
 346                                 }
 347                         }
 348                         goto out;
 349                 }
 350         }
 351         err = -EINVAL;
 352
 353 out:
 354         spin_unlock_bh(&rose_neigh_list_lock);
 355         spin_unlock_bh(&rose_node_list_lock);
 356
 357         return err;
 358 }
 359
 360 /*
 361  *      Add the loopback neighbour.
 362  */
 363 void rose_add_loopback_neigh(void)
 364 {
 365         struct rose_neigh *sn = &rose_loopback_neigh;
 366
 367         sn->callsign  = null_ax25_address;
 368         sn->digipeat  = NULL;
 369         sn->ax25      = NULL;
 370         sn->dev       = NULL;
 371         sn->count     = 0;
 372         sn->use       = 0;
 373         sn->dce_mode  = 1;
 374         sn->loopback  = 1;
 375         sn->number    = rose_neigh_no++;
 376         sn->restarted = 1;
 377
 378         skb_queue_head_init(&sn->queue);
 379
 380         init_timer(&sn->ftimer);
 381         init_timer(&sn->t0timer);
 382
 383         spin_lock_bh(&rose_neigh_list_lock);
 384         sn->next = rose_neigh_list;
 385         rose_neigh_list           = sn;
 386         spin_unlock_bh(&rose_neigh_list_lock);
 387 }
 388
 389 /*
 390  *      Add a loopback node.
 391  */
 392 int rose_add_loopback_node(rose_address *address)
 393 {
 394         struct rose_node *rose_node;
 395         int err = 0;
 396
 397         spin_lock_bh(&rose_node_list_lock);
 398
 399         rose_node = rose_node_list;
 400         while (rose_node != NULL) {
 401                 if ((rose_node->mask == 10) &&
 402                      (rosecmpm(address, &rose_node->address, 10) == 0) &&
 403                      rose_node->loopback)
 404                         break;
 405                 rose_node = rose_node->next;
 406         }
 407
 408         if (rose_node != NULL)
 409                 goto out;
 410
 411         if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
 412                 err = -ENOMEM;
 413                 goto out;
 414         }
 415
 416         rose_node->address      = *address;
 417         rose_node->mask         = 10;
 418         rose_node->count        = 1;
 419         rose_node->loopback     = 1;
 420         rose_node->neighbour[0] = &rose_loopback_neigh;
 421
 422         /* Insert at the head of list. Address is always mask=10 */
 423         rose_node->next = rose_node_list;
 424         rose_node_list  = rose_node;
 425
 426         rose_loopback_neigh.count++;
 427
 428 out:
 429         spin_unlock_bh(&rose_node_list_lock);
 430
 431         return err;
 432 }
 433
 434 /*
 435  *      Delete a loopback node.
 436  */
 437 void rose_del_loopback_node(rose_address *address)
 438 {
 439         struct rose_node *rose_node;
 440
 441         spin_lock_bh(&rose_node_list_lock);
 442
 443         rose_node = rose_node_list;
 444         while (rose_node != NULL) {
 445                 if ((rose_node->mask == 10) &&
 446                     (rosecmpm(address, &rose_node->address, 10) == 0) &&
 447                     rose_node->loopback)
 448                         break;
 449                 rose_node = rose_node->next;
 450         }
 451
 452         if (rose_node == NULL)
 453                 goto out;
 454
 455         rose_remove_node(rose_node);
 456
 457         rose_loopback_neigh.count--;
 458
 459 out:
 460         spin_unlock_bh(&rose_node_list_lock);
 461 }
 462
 463 /*
 464  *      A device has been removed. Remove its routes and neighbours.
 465  */
 466 void rose_rt_device_down(struct net_device *dev)
 467 {
 468         struct rose_neigh *s, *rose_neigh;
 469         struct rose_node  *t, *rose_node;
 470         int i;
 471
 472         spin_lock_bh(&rose_node_list_lock);
 473         spin_lock_bh(&rose_neigh_list_lock);
 474         rose_neigh = rose_neigh_list;
 475         while (rose_neigh != NULL) {
 476                 s          = rose_neigh;
 477                 rose_neigh = rose_neigh->next;
 478
 479                 if (s->dev != dev)
 480                         continue;
 481
 482                 rose_node = rose_node_list;
 483
 484                 while (rose_node != NULL) {
 485                         t         = rose_node;
 486                         rose_node = rose_node->next;
 487
 488                         for (i = 0; i < t->count; i++) {
 489                                 if (t->neighbour[i] != s)
 490                                         continue;
 491
 492                                 t->count--;
 493
 494                                 switch (i) {
 495                                 case 0:
 496                                         t->neighbour[0] = t->neighbour[1];
 497                                 case 1:
 498                                         t->neighbour[1] = t->neighbour[2];
 499                                 case 2:
 500                                         break;
 501                                 }
 502                         }
 503
 504                         if (t->count <= 0)
 505                                 rose_remove_node(t);
 506                 }
 507
 508                 rose_remove_neigh(s);
 509         }
 510         spin_unlock_bh(&rose_neigh_list_lock);
 511         spin_unlock_bh(&rose_node_list_lock);
 512 }
 513
 514 #if 0 /* Currently unused */
 515 /*
 516  *      A device has been removed. Remove its links.
 517  */
 518 void rose_route_device_down(struct net_device *dev)
 519 {
 520         struct rose_route *s, *rose_route;
 521
 522         spin_lock_bh(&rose_route_list_lock);
 523         rose_route = rose_route_list;
 524         while (rose_route != NULL) {
 525                 s          = rose_route;
 526                 rose_route = rose_route->next;
 527
 528                 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
 529                         rose_remove_route(s);
 530         }
 531         spin_unlock_bh(&rose_route_list_lock);
 532 }
 533 #endif
 534
 535 /*
 536  *      Clear all nodes and neighbours out, except for neighbours with
 537  *      active connections going through them.
 538  *  Do not clear loopback neighbour and nodes.
 539  */
 540 static int rose_clear_routes(void)
 541 {
 542         struct rose_neigh *s, *rose_neigh;
 543         struct rose_node  *t, *rose_node;
 544
 545         spin_lock_bh(&rose_node_list_lock);
 546         spin_lock_bh(&rose_neigh_list_lock);
 547
 548         rose_neigh = rose_neigh_list;
 549         rose_node  = rose_node_list;
 550
 551         while (rose_node != NULL) {
 552                 t         = rose_node;
 553                 rose_node = rose_node->next;
 554                 if (!t->loopback)
 555                         rose_remove_node(t);
 556         }
 557
 558         while (rose_neigh != NULL) {
 559                 s          = rose_neigh;
 560                 rose_neigh = rose_neigh->next;
 561
 562                 if (s->use == 0 && !s->loopback) {
 563                         s->count = 0;
 564                         rose_remove_neigh(s);
 565                 }
 566         }
 567
 568         spin_unlock_bh(&rose_neigh_list_lock);
 569         spin_unlock_bh(&rose_node_list_lock);
 570
 571         return 0;
 572 }
 573
 574 /*
 575  *      Check that the device given is a valid AX.25 interface that is "up".
 576  */
 577 static struct net_device *rose_ax25_dev_get(char *devname)
 578 {
 579         struct net_device *dev;
 580
 581         if ((dev = dev_get_by_name(devname)) == NULL)
 582                 return NULL;
 583
 584         if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
 585                 return dev;
 586
 587         dev_put(dev);
 588         return NULL;
 589 }
 590
 591 /*
 592  *      Find the first active ROSE device, usually "rose0".
 593  */
 594 struct net_device *rose_dev_first(void)
 595 {
 596         struct net_device *dev, *first = NULL;
 597
 598         read_lock(&dev_base_lock);
 599         for_each_netdev(dev) {
 600                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
 601                         if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
 602                                 first = dev;
 603         }
 604         read_unlock(&dev_base_lock);
 605
 606         return first;
 607 }
 608
 609 /*
 610  *      Find the ROSE device for the given address.
 611  */
 612 struct net_device *rose_dev_get(rose_address *addr)
 613 {
 614         struct net_device *dev;
 615
 616         read_lock(&dev_base_lock);
 617         for_each_netdev(dev) {
 618                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
 619                         dev_hold(dev);
 620                         goto out;
 621                 }
 622         }
 623         dev = NULL;
 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_each_netdev(dev) {
 635                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
 636                         goto out;
 637         }
 638         dev = NULL;
 639 out:
 640         read_unlock(&dev_base_lock);
 641         return dev != NULL;
 642 }
 643
 644
 645
 646
 647 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
 648 {
 649         struct rose_route *rose_route;
 650
 651         for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
 652                 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
 653                     (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
 654                         return rose_route;
 655
 656         return NULL;
 657 }
 658
 659 /*
 660  *      Find a neighbour given a ROSE address.
 661  */
 662 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
 663         unsigned char *diagnostic)
 664 {
 665         struct rose_neigh *res = NULL;
 666         struct rose_node *node;
 667         int failed = 0;
 668         int i;
 669
 670         spin_lock_bh(&rose_node_list_lock);
 671         for (node = rose_node_list; node != NULL; node = node->next) {
 672                 if (rosecmpm(addr, &node->address, node->mask) == 0) {
 673                         for (i = 0; i < node->count; i++) {
 674                                 if (!rose_ftimer_running(node->neighbour[i])) {
 675                                         res = node->neighbour[i];
 676                                         goto out;
 677                                 } else
 678                                         failed = 1;
 679                         }
 680                         break;
 681                 }
 682         }
 683
 684         if (failed) {
 685                 *cause      = ROSE_OUT_OF_ORDER;
 686                 *diagnostic = 0;
 687         } else {
 688                 *cause      = ROSE_NOT_OBTAINABLE;
 689                 *diagnostic = 0;
 690         }
 691
 692 out:
 693         spin_unlock_bh(&rose_node_list_lock);
 694
 695         return res;
 696 }
 697
 698 /*
 699  *      Handle the ioctls that control the routing functions.
 700  */
 701 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
 702 {
 703         struct rose_route_struct rose_route;
 704         struct net_device *dev;
 705         int err;
 706
 707         switch (cmd) {
 708         case SIOCADDRT:
 709                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 710                         return -EFAULT;
 711                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 712                         return -EINVAL;
 713                 if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
 714                         dev_put(dev);
 715                         return -EINVAL;
 716                 }
 717                 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
 718                         return -EINVAL;
 719                 if (rose_route.ndigis > AX25_MAX_DIGIS)
 720                         return -EINVAL;
 721                 err = rose_add_node(&rose_route, dev);
 722                 dev_put(dev);
 723                 return err;
 724
 725         case SIOCDELRT:
 726                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 727                         return -EFAULT;
 728                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 729                         return -EINVAL;
 730                 err = rose_del_node(&rose_route, dev);
 731                 dev_put(dev);
 732                 return err;
 733
 734         case SIOCRSCLRRT:
 735                 return rose_clear_routes();
 736
 737         default:
 738                 return -EINVAL;
 739         }
 740
 741         return 0;
 742 }
 743
 744 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
 745 {
 746         struct rose_route *rose_route, *s;
 747
 748         rose_neigh->restarted = 0;
 749
 750         rose_stop_t0timer(rose_neigh);
 751         rose_start_ftimer(rose_neigh);
 752
 753         skb_queue_purge(&rose_neigh->queue);
 754
 755         spin_lock_bh(&rose_route_list_lock);
 756
 757         rose_route = rose_route_list;
 758
 759         while (rose_route != NULL) {
 760                 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
 761                     (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL)       ||
 762                     (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
 763                         s = rose_route->next;
 764                         rose_remove_route(rose_route);
 765                         rose_route = s;
 766                         continue;
 767                 }
 768
 769                 if (rose_route->neigh1 == rose_neigh) {
 770                         rose_route->neigh1->use--;
 771                         rose_route->neigh1 = NULL;
 772                         rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
 773                 }
 774
 775                 if (rose_route->neigh2 == rose_neigh) {
 776                         rose_route->neigh2->use--;
 777                         rose_route->neigh2 = NULL;
 778                         rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
 779                 }
 780
 781                 rose_route = rose_route->next;
 782         }
 783         spin_unlock_bh(&rose_route_list_lock);
 784 }
 785
 786 /*
 787  *      A level 2 link has timed out, therefore it appears to be a poor link,
 788  *      then don't use that neighbour until it is reset. Blow away all through
 789  *      routes and connections using this route.
 790  */
 791 void rose_link_failed(ax25_cb *ax25, int reason)
 792 {
 793         struct rose_neigh *rose_neigh;
 794
 795         spin_lock_bh(&rose_neigh_list_lock);
 796         rose_neigh = rose_neigh_list;
 797         while (rose_neigh != NULL) {
 798                 if (rose_neigh->ax25 == ax25)
 799                         break;
 800                 rose_neigh = rose_neigh->next;
 801         }
 802
 803         if (rose_neigh != NULL) {
 804                 rose_neigh->ax25 = NULL;
 805
 806                 rose_del_route_by_neigh(rose_neigh);
 807                 rose_kill_by_neigh(rose_neigh);
 808         }
 809         spin_unlock_bh(&rose_neigh_list_lock);
 810 }
 811
 812 /*
 813  *      A device has been "downed" remove its link status. Blow away all
 814  *      through routes and connections that use this device.
 815  */
 816 void rose_link_device_down(struct net_device *dev)
 817 {
 818         struct rose_neigh *rose_neigh;
 819
 820         for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
 821                 if (rose_neigh->dev == dev) {
 822                         rose_del_route_by_neigh(rose_neigh);
 823                         rose_kill_by_neigh(rose_neigh);
 824                 }
 825         }
 826 }
 827
 828 /*
 829  *      Route a frame to an appropriate AX.25 connection.
 830  */
 831 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
 832 {
 833         struct rose_neigh *rose_neigh, *new_neigh;
 834         struct rose_route *rose_route;
 835         struct rose_facilities_struct facilities;
 836         rose_address *src_addr, *dest_addr;
 837         struct sock *sk;
 838         unsigned short frametype;
 839         unsigned int lci, new_lci;
 840         unsigned char cause, diagnostic;
 841         struct net_device *dev;
 842         int len, res = 0;
 843         char buf[11];
 844
 845 #if 0
 846         if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
 847                 return res;
 848 #endif
 849
 850         frametype = skb->data[2];
 851         lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
 852         src_addr  = (rose_address *)(skb->data + 9);
 853         dest_addr = (rose_address *)(skb->data + 4);
 854
 855         spin_lock_bh(&rose_node_list_lock);
 856         spin_lock_bh(&rose_neigh_list_lock);
 857         spin_lock_bh(&rose_route_list_lock);
 858
 859         rose_neigh = rose_neigh_list;
 860         while (rose_neigh != NULL) {
 861                 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
 862                     ax25->ax25_dev->dev == rose_neigh->dev)
 863                         break;
 864                 rose_neigh = rose_neigh->next;
 865         }
 866
 867         if (rose_neigh == NULL) {
 868                 printk("rose_route : unknown neighbour or device %s\n",
 869                        ax2asc(buf, &ax25->dest_addr));
 870                 goto out;
 871         }
 872
 873         /*
 874          *      Obviously the link is working, halt the ftimer.
 875          */
 876         rose_stop_ftimer(rose_neigh);
 877
 878         /*
 879          *      LCI of zero is always for us, and its always a restart
 880          *      frame.
 881          */
 882         if (lci == 0) {
 883                 rose_link_rx_restart(skb, rose_neigh, frametype);
 884                 goto out;
 885         }
 886
 887         /*
 888          *      Find an existing socket.
 889          */
 890         if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
 891                 if (frametype == ROSE_CALL_REQUEST) {
 892                         struct rose_sock *rose = rose_sk(sk);
 893
 894                         /* Remove an existing unused socket */
 895                         rose_clear_queues(sk);
 896                         rose->cause      = ROSE_NETWORK_CONGESTION;
 897                         rose->diagnostic = 0;
 898                         rose->neighbour->use--;
 899                         rose->neighbour  = NULL;
 900                         rose->lci        = 0;
 901                         rose->state      = ROSE_STATE_0;
 902                         sk->sk_state     = TCP_CLOSE;
 903                         sk->sk_err       = 0;
 904                         sk->sk_shutdown  |= SEND_SHUTDOWN;
 905                         if (!sock_flag(sk, SOCK_DEAD)) {
 906                                 sk->sk_state_change(sk);
 907                                 sock_set_flag(sk, SOCK_DEAD);
 908                         }
 909                 }
 910                 else {
 911                         skb_reset_transport_header(skb);
 912                         res = rose_process_rx_frame(sk, skb);
 913                         goto out;
 914                 }
 915         }
 916
 917         /*
 918          *      Is is a Call Request and is it for us ?
 919          */
 920         if (frametype == ROSE_CALL_REQUEST)
 921                 if ((dev = rose_dev_get(dest_addr)) != NULL) {
 922                         res = rose_rx_call_request(skb, dev, rose_neigh, lci);
 923                         dev_put(dev);
 924                         goto out;
 925                 }
 926
 927         if (!sysctl_rose_routing_control) {
 928                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
 929                 goto out;
 930         }
 931
 932         /*
 933          *      Route it to the next in line if we have an entry for it.
 934          */
 935         rose_route = rose_route_list;
 936         while (rose_route != NULL) {
 937                 if (rose_route->lci1 == lci &&
 938                     rose_route->neigh1 == rose_neigh) {
 939                         if (frametype == ROSE_CALL_REQUEST) {
 940                                 /* F6FBB - Remove an existing unused route */
 941                                 rose_remove_route(rose_route);
 942                                 break;
 943                         } else if (rose_route->neigh2 != NULL) {
 944                                 skb->data[0] &= 0xF0;
 945                                 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
 946                                 skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
 947                                 rose_transmit_link(skb, rose_route->neigh2);
 948                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 949                                         rose_remove_route(rose_route);
 950                                 res = 1;
 951                                 goto out;
 952                         } else {
 953                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 954                                         rose_remove_route(rose_route);
 955                                 goto out;
 956                         }
 957                 }
 958                 if (rose_route->lci2 == lci &&
 959                     rose_route->neigh2 == rose_neigh) {
 960                         if (frametype == ROSE_CALL_REQUEST) {
 961                                 /* F6FBB - Remove an existing unused route */
 962                                 rose_remove_route(rose_route);
 963                                 break;
 964                         } else if (rose_route->neigh1 != NULL) {
 965                                 skb->data[0] &= 0xF0;
 966                                 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
 967                                 skb->data[1]  = (rose_route->lci1 >> 0) & 0xFF;
 968                                 rose_transmit_link(skb, rose_route->neigh1);
 969                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 970                                         rose_remove_route(rose_route);
 971                                 res = 1;
 972                                 goto out;
 973                         } else {
 974                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 975                                         rose_remove_route(rose_route);
 976                                 goto out;
 977                         }
 978                 }
 979                 rose_route = rose_route->next;
 980         }
 981
 982         /*
 983          *      We know that:
 984          *      1. The frame isn't for us,
 985          *      2. It isn't "owned" by any existing route.
 986          */
 987         if (frametype != ROSE_CALL_REQUEST) {   /* XXX */
 988                 res = 0;
 989                 goto out;
 990         }
 991
 992         len  = (((skb->data[3] >> 4) & 0x0F) + 1) / 2;
 993         len += (((skb->data[3] >> 0) & 0x0F) + 1) / 2;
 994
 995         memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
 996
 997         if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
 998                 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
 999                 goto out;
1000         }
1001
1002         /*
1003          *      Check for routing loops.
1004          */
1005         rose_route = rose_route_list;
1006         while (rose_route != NULL) {
1007                 if (rose_route->rand == facilities.rand &&
1008                     rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1009                     ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1010                     ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1011                         rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1012                         goto out;
1013                 }
1014                 rose_route = rose_route->next;
1015         }
1016
1017         if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == NULL) {
1018                 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1019                 goto out;
1020         }
1021
1022         if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1023                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1024                 goto out;
1025         }
1026
1027         if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1028                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1029                 goto out;
1030         }
1031
1032         rose_route->lci1      = lci;
1033         rose_route->src_addr  = *src_addr;
1034         rose_route->dest_addr = *dest_addr;
1035         rose_route->src_call  = facilities.dest_call;
1036         rose_route->dest_call = facilities.source_call;
1037         rose_route->rand      = facilities.rand;
1038         rose_route->neigh1    = rose_neigh;
1039         rose_route->lci2      = new_lci;
1040         rose_route->neigh2    = new_neigh;
1041
1042         rose_route->neigh1->use++;
1043         rose_route->neigh2->use++;
1044
1045         rose_route->next = rose_route_list;
1046         rose_route_list  = rose_route;
1047
1048         skb->data[0] &= 0xF0;
1049         skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1050         skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
1051
1052         rose_transmit_link(skb, rose_route->neigh2);
1053         res = 1;
1054
1055 out:
1056         spin_unlock_bh(&rose_route_list_lock);
1057         spin_unlock_bh(&rose_neigh_list_lock);
1058         spin_unlock_bh(&rose_node_list_lock);
1059
1060         return res;
1061 }
1062
1063 #ifdef CONFIG_PROC_FS
1064
1065 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1066 {
1067         struct rose_node *rose_node;
1068         int i = 1;
1069
1070         spin_lock_bh(&rose_neigh_list_lock);
1071         if (*pos == 0)
1072                 return SEQ_START_TOKEN;
1073
1074         for (rose_node = rose_node_list; rose_node && i < *pos;
1075              rose_node = rose_node->next, ++i);
1076
1077         return (i == *pos) ? rose_node : NULL;
1078 }
1079
1080 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1081 {
1082         ++*pos;
1083
1084         return (v == SEQ_START_TOKEN) ? rose_node_list
1085                 : ((struct rose_node *)v)->next;
1086 }
1087
1088 static void rose_node_stop(struct seq_file *seq, void *v)
1089 {
1090         spin_unlock_bh(&rose_neigh_list_lock);
1091 }
1092
1093 static int rose_node_show(struct seq_file *seq, void *v)
1094 {
1095         int i;
1096
1097         if (v == SEQ_START_TOKEN)
1098                 seq_puts(seq, "address    mask n neigh neigh neigh\n");
1099         else {
1100                 const struct rose_node *rose_node = v;
1101                 /* if (rose_node->loopback) {
1102                         seq_printf(seq, "%-10s %04d 1 loopback\n",
1103                                 rose2asc(&rose_node->address),
1104                                 rose_node->mask);
1105                 } else { */
1106                         seq_printf(seq, "%-10s %04d %d",
1107                                 rose2asc(&rose_node->address),
1108                                 rose_node->mask,
1109                                 rose_node->count);
1110
1111                         for (i = 0; i < rose_node->count; i++)
1112                                 seq_printf(seq, " %05d",
1113                                         rose_node->neighbour[i]->number);
1114
1115                         seq_puts(seq, "\n");
1116                 /* } */
1117         }
1118         return 0;
1119 }
1120
1121 static const struct seq_operations rose_node_seqops = {
1122         .start = rose_node_start,
1123         .next = rose_node_next,
1124         .stop = rose_node_stop,
1125         .show = rose_node_show,
1126 };
1127
1128 static int rose_nodes_open(struct inode *inode, struct file *file)
1129 {
1130         return seq_open(file, &rose_node_seqops);
1131 }
1132
1133 const struct file_operations rose_nodes_fops = {
1134         .owner = THIS_MODULE,
1135         .open = rose_nodes_open,
1136         .read = seq_read,
1137         .llseek = seq_lseek,
1138         .release = seq_release,
1139 };
1140
1141 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1142 {
1143         struct rose_neigh *rose_neigh;
1144         int i = 1;
1145
1146         spin_lock_bh(&rose_neigh_list_lock);
1147         if (*pos == 0)
1148                 return SEQ_START_TOKEN;
1149
1150         for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1151              rose_neigh = rose_neigh->next, ++i);
1152
1153         return (i == *pos) ? rose_neigh : NULL;
1154 }
1155
1156 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1157 {
1158         ++*pos;
1159
1160         return (v == SEQ_START_TOKEN) ? rose_neigh_list
1161                 : ((struct rose_neigh *)v)->next;
1162 }
1163
1164 static void rose_neigh_stop(struct seq_file *seq, void *v)
1165 {
1166         spin_unlock_bh(&rose_neigh_list_lock);
1167 }
1168
1169 static int rose_neigh_show(struct seq_file *seq, void *v)
1170 {
1171         char buf[11];
1172         int i;
1173
1174         if (v == SEQ_START_TOKEN)
1175                 seq_puts(seq,
1176                          "addr  callsign  dev  count use mode restart  t0  tf digipeaters\n");
1177         else {
1178                 struct rose_neigh *rose_neigh = v;
1179
1180                 /* if (!rose_neigh->loopback) { */
1181                 seq_printf(seq, "%05d %-9s %-4s   %3d %3d  %3s     %3s %3lu %3lu",
1182                            rose_neigh->number,
1183                            (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1184                            rose_neigh->dev ? rose_neigh->dev->name : "???",
1185                            rose_neigh->count,
1186                            rose_neigh->use,
1187                            (rose_neigh->dce_mode) ? "DCE" : "DTE",
1188                            (rose_neigh->restarted) ? "yes" : "no",
1189                            ax25_display_timer(&rose_neigh->t0timer) / HZ,
1190                            ax25_display_timer(&rose_neigh->ftimer)  / HZ);
1191
1192                 if (rose_neigh->digipeat != NULL) {
1193                         for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1194                                 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1195                 }
1196
1197                 seq_puts(seq, "\n");
1198         }
1199         return 0;
1200 }
1201
1202
1203 static const struct seq_operations rose_neigh_seqops = {
1204         .start = rose_neigh_start,
1205         .next = rose_neigh_next,
1206         .stop = rose_neigh_stop,
1207         .show = rose_neigh_show,
1208 };
1209
1210 static int rose_neigh_open(struct inode *inode, struct file *file)
1211 {
1212         return seq_open(file, &rose_neigh_seqops);
1213 }
1214
1215 const struct file_operations rose_neigh_fops = {
1216         .owner = THIS_MODULE,
1217         .open = rose_neigh_open,
1218         .read = seq_read,
1219         .llseek = seq_lseek,
1220         .release = seq_release,
1221 };
1222
1223
1224 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1225 {
1226         struct rose_route *rose_route;
1227         int i = 1;
1228
1229         spin_lock_bh(&rose_route_list_lock);
1230         if (*pos == 0)
1231                 return SEQ_START_TOKEN;
1232
1233         for (rose_route = rose_route_list; rose_route && i < *pos;
1234              rose_route = rose_route->next, ++i);
1235
1236         return (i == *pos) ? rose_route : NULL;
1237 }
1238
1239 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1240 {
1241         ++*pos;
1242
1243         return (v == SEQ_START_TOKEN) ? rose_route_list
1244                 : ((struct rose_route *)v)->next;
1245 }
1246
1247 static void rose_route_stop(struct seq_file *seq, void *v)
1248 {
1249         spin_unlock_bh(&rose_route_list_lock);
1250 }
1251
1252 static int rose_route_show(struct seq_file *seq, void *v)
1253 {
1254         char buf[11];
1255
1256         if (v == SEQ_START_TOKEN)
1257                 seq_puts(seq,
1258                          "lci  address     callsign   neigh  <-> lci  address     callsign   neigh\n");
1259         else {
1260                 struct rose_route *rose_route = v;
1261
1262                 if (rose_route->neigh1)
1263                         seq_printf(seq,
1264                                    "%3.3X  %-10s  %-9s  %05d      ",
1265                                    rose_route->lci1,
1266                                    rose2asc(&rose_route->src_addr),
1267                                    ax2asc(buf, &rose_route->src_call),
1268                                    rose_route->neigh1->number);
1269                 else
1270                         seq_puts(seq,
1271                                  "000  *           *          00000      ");
1272
1273                 if (rose_route->neigh2)
1274                         seq_printf(seq,
1275                                    "%3.3X  %-10s  %-9s  %05d\n",
1276                                 rose_route->lci2,
1277                                 rose2asc(&rose_route->dest_addr),
1278                                 ax2asc(buf, &rose_route->dest_call),
1279                                 rose_route->neigh2->number);
1280                  else
1281                          seq_puts(seq,
1282                                   "000  *           *          00000\n");
1283                 }
1284         return 0;
1285 }
1286
1287 static const struct seq_operations rose_route_seqops = {
1288         .start = rose_route_start,
1289         .next = rose_route_next,
1290         .stop = rose_route_stop,
1291         .show = rose_route_show,
1292 };
1293
1294 static int rose_route_open(struct inode *inode, struct file *file)
1295 {
1296         return seq_open(file, &rose_route_seqops);
1297 }
1298
1299 const struct file_operations rose_routes_fops = {
1300         .owner = THIS_MODULE,
1301         .open = rose_route_open,
1302         .read = seq_read,
1303         .llseek = seq_lseek,
1304         .release = seq_release,
1305 };
1306
1307 #endif /* CONFIG_PROC_FS */
1308
1309 /*
1310  *      Release all memory associated with ROSE routing structures.
1311  */
1312 void __exit rose_rt_free(void)
1313 {
1314         struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1315         struct rose_node  *t, *rose_node  = rose_node_list;
1316         struct rose_route *u, *rose_route = rose_route_list;
1317
1318         while (rose_neigh != NULL) {
1319                 s          = rose_neigh;
1320                 rose_neigh = rose_neigh->next;
1321
1322                 rose_remove_neigh(s);
1323         }
1324
1325         while (rose_node != NULL) {
1326                 t         = rose_node;
1327                 rose_node = rose_node->next;
1328
1329                 rose_remove_node(t);
1330         }
1331
1332         while (rose_route != NULL) {
1333                 u          = rose_route;
1334                 rose_route = rose_route->next;
1335
1336                 rose_remove_route(u);
1337         }
1338 }