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;
 366
 367         rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL);
 368         if (!rose_loopback_neigh)
 369                 return;
 370         sn = rose_loopback_neigh;
 371
 372         sn->callsign  = null_ax25_address;
 373         sn->digipeat  = NULL;
 374         sn->ax25      = NULL;
 375         sn->dev       = NULL;
 376         sn->count     = 0;
 377         sn->use       = 0;
 378         sn->dce_mode  = 1;
 379         sn->loopback  = 1;
 380         sn->number    = rose_neigh_no++;
 381         sn->restarted = 1;
 382
 383         skb_queue_head_init(&sn->queue);
 384
 385         init_timer(&sn->ftimer);
 386         init_timer(&sn->t0timer);
 387
 388         spin_lock_bh(&rose_neigh_list_lock);
 389         sn->next = rose_neigh_list;
 390         rose_neigh_list           = sn;
 391         spin_unlock_bh(&rose_neigh_list_lock);
 392 }
 393
 394 /*
 395  *      Add a loopback node.
 396  */
 397 int rose_add_loopback_node(rose_address *address)
 398 {
 399         struct rose_node *rose_node;
 400         int err = 0;
 401
 402         spin_lock_bh(&rose_node_list_lock);
 403
 404         rose_node = rose_node_list;
 405         while (rose_node != NULL) {
 406                 if ((rose_node->mask == 10) &&
 407                      (rosecmpm(address, &rose_node->address, 10) == 0) &&
 408                      rose_node->loopback)
 409                         break;
 410                 rose_node = rose_node->next;
 411         }
 412
 413         if (rose_node != NULL)
 414                 goto out;
 415
 416         if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
 417                 err = -ENOMEM;
 418                 goto out;
 419         }
 420
 421         rose_node->address      = *address;
 422         rose_node->mask         = 10;
 423         rose_node->count        = 1;
 424         rose_node->loopback     = 1;
 425         rose_node->neighbour[0] = rose_loopback_neigh;
 426
 427         /* Insert at the head of list. Address is always mask=10 */
 428         rose_node->next = rose_node_list;
 429         rose_node_list  = rose_node;
 430
 431         rose_loopback_neigh->count++;
 432
 433 out:
 434         spin_unlock_bh(&rose_node_list_lock);
 435
 436         return err;
 437 }
 438
 439 /*
 440  *      Delete a loopback node.
 441  */
 442 void rose_del_loopback_node(rose_address *address)
 443 {
 444         struct rose_node *rose_node;
 445
 446         spin_lock_bh(&rose_node_list_lock);
 447
 448         rose_node = rose_node_list;
 449         while (rose_node != NULL) {
 450                 if ((rose_node->mask == 10) &&
 451                     (rosecmpm(address, &rose_node->address, 10) == 0) &&
 452                     rose_node->loopback)
 453                         break;
 454                 rose_node = rose_node->next;
 455         }
 456
 457         if (rose_node == NULL)
 458                 goto out;
 459
 460         rose_remove_node(rose_node);
 461
 462         rose_loopback_neigh->count--;
 463
 464 out:
 465         spin_unlock_bh(&rose_node_list_lock);
 466 }
 467
 468 /*
 469  *      A device has been removed. Remove its routes and neighbours.
 470  */
 471 void rose_rt_device_down(struct net_device *dev)
 472 {
 473         struct rose_neigh *s, *rose_neigh;
 474         struct rose_node  *t, *rose_node;
 475         int i;
 476
 477         spin_lock_bh(&rose_node_list_lock);
 478         spin_lock_bh(&rose_neigh_list_lock);
 479         rose_neigh = rose_neigh_list;
 480         while (rose_neigh != NULL) {
 481                 s          = rose_neigh;
 482                 rose_neigh = rose_neigh->next;
 483
 484                 if (s->dev != dev)
 485                         continue;
 486
 487                 rose_node = rose_node_list;
 488
 489                 while (rose_node != NULL) {
 490                         t         = rose_node;
 491                         rose_node = rose_node->next;
 492
 493                         for (i = 0; i < t->count; i++) {
 494                                 if (t->neighbour[i] != s)
 495                                         continue;
 496
 497                                 t->count--;
 498
 499                                 switch (i) {
 500                                 case 0:
 501                                         t->neighbour[0] = t->neighbour[1];
 502                                 case 1:
 503                                         t->neighbour[1] = t->neighbour[2];
 504                                 case 2:
 505                                         break;
 506                                 }
 507                         }
 508
 509                         if (t->count <= 0)
 510                                 rose_remove_node(t);
 511                 }
 512
 513                 rose_remove_neigh(s);
 514         }
 515         spin_unlock_bh(&rose_neigh_list_lock);
 516         spin_unlock_bh(&rose_node_list_lock);
 517 }
 518
 519 #if 0 /* Currently unused */
 520 /*
 521  *      A device has been removed. Remove its links.
 522  */
 523 void rose_route_device_down(struct net_device *dev)
 524 {
 525         struct rose_route *s, *rose_route;
 526
 527         spin_lock_bh(&rose_route_list_lock);
 528         rose_route = rose_route_list;
 529         while (rose_route != NULL) {
 530                 s          = rose_route;
 531                 rose_route = rose_route->next;
 532
 533                 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
 534                         rose_remove_route(s);
 535         }
 536         spin_unlock_bh(&rose_route_list_lock);
 537 }
 538 #endif
 539
 540 /*
 541  *      Clear all nodes and neighbours out, except for neighbours with
 542  *      active connections going through them.
 543  *  Do not clear loopback neighbour and nodes.
 544  */
 545 static int rose_clear_routes(void)
 546 {
 547         struct rose_neigh *s, *rose_neigh;
 548         struct rose_node  *t, *rose_node;
 549
 550         spin_lock_bh(&rose_node_list_lock);
 551         spin_lock_bh(&rose_neigh_list_lock);
 552
 553         rose_neigh = rose_neigh_list;
 554         rose_node  = rose_node_list;
 555
 556         while (rose_node != NULL) {
 557                 t         = rose_node;
 558                 rose_node = rose_node->next;
 559                 if (!t->loopback)
 560                         rose_remove_node(t);
 561         }
 562
 563         while (rose_neigh != NULL) {
 564                 s          = rose_neigh;
 565                 rose_neigh = rose_neigh->next;
 566
 567                 if (s->use == 0 && !s->loopback) {
 568                         s->count = 0;
 569                         rose_remove_neigh(s);
 570                 }
 571         }
 572
 573         spin_unlock_bh(&rose_neigh_list_lock);
 574         spin_unlock_bh(&rose_node_list_lock);
 575
 576         return 0;
 577 }
 578
 579 /*
 580  *      Check that the device given is a valid AX.25 interface that is "up".
 581  */
 582 static struct net_device *rose_ax25_dev_get(char *devname)
 583 {
 584         struct net_device *dev;
 585
 586         if ((dev = dev_get_by_name(&init_net, devname)) == NULL)
 587                 return NULL;
 588
 589         if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
 590                 return dev;
 591
 592         dev_put(dev);
 593         return NULL;
 594 }
 595
 596 /*
 597  *      Find the first active ROSE device, usually "rose0".
 598  */
 599 struct net_device *rose_dev_first(void)
 600 {
 601         struct net_device *dev, *first = NULL;
 602
 603         read_lock(&dev_base_lock);
 604         for_each_netdev(&init_net, dev) {
 605                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
 606                         if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
 607                                 first = dev;
 608         }
 609         read_unlock(&dev_base_lock);
 610
 611         return first;
 612 }
 613
 614 /*
 615  *      Find the ROSE device for the given address.
 616  */
 617 struct net_device *rose_dev_get(rose_address *addr)
 618 {
 619         struct net_device *dev;
 620
 621         read_lock(&dev_base_lock);
 622         for_each_netdev(&init_net, dev) {
 623                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
 624                         dev_hold(dev);
 625                         goto out;
 626                 }
 627         }
 628         dev = NULL;
 629 out:
 630         read_unlock(&dev_base_lock);
 631         return dev;
 632 }
 633
 634 static int rose_dev_exists(rose_address *addr)
 635 {
 636         struct net_device *dev;
 637
 638         read_lock(&dev_base_lock);
 639         for_each_netdev(&init_net, dev) {
 640                 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
 641                         goto out;
 642         }
 643         dev = NULL;
 644 out:
 645         read_unlock(&dev_base_lock);
 646         return dev != NULL;
 647 }
 648
 649
 650
 651
 652 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
 653 {
 654         struct rose_route *rose_route;
 655
 656         for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
 657                 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
 658                     (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
 659                         return rose_route;
 660
 661         return NULL;
 662 }
 663
 664 /*
 665  *      Find a neighbour given a ROSE address.
 666  */
 667 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
 668         unsigned char *diagnostic)
 669 {
 670         struct rose_neigh *res = NULL;
 671         struct rose_node *node;
 672         int failed = 0;
 673         int i;
 674
 675         spin_lock_bh(&rose_node_list_lock);
 676         for (node = rose_node_list; node != NULL; node = node->next) {
 677                 if (rosecmpm(addr, &node->address, node->mask) == 0) {
 678                         for (i = 0; i < node->count; i++) {
 679                                 if (!rose_ftimer_running(node->neighbour[i])) {
 680                                         res = node->neighbour[i];
 681                                         goto out;
 682                                 } else
 683                                         failed = 1;
 684                         }
 685                         break;
 686                 }
 687         }
 688
 689         if (failed) {
 690                 *cause      = ROSE_OUT_OF_ORDER;
 691                 *diagnostic = 0;
 692         } else {
 693                 *cause      = ROSE_NOT_OBTAINABLE;
 694                 *diagnostic = 0;
 695         }
 696
 697 out:
 698         spin_unlock_bh(&rose_node_list_lock);
 699
 700         return res;
 701 }
 702
 703 /*
 704  *      Handle the ioctls that control the routing functions.
 705  */
 706 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
 707 {
 708         struct rose_route_struct rose_route;
 709         struct net_device *dev;
 710         int err;
 711
 712         switch (cmd) {
 713         case SIOCADDRT:
 714                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 715                         return -EFAULT;
 716                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 717                         return -EINVAL;
 718                 if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
 719                         dev_put(dev);
 720                         return -EINVAL;
 721                 }
 722                 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
 723                         return -EINVAL;
 724                 if (rose_route.ndigis > AX25_MAX_DIGIS)
 725                         return -EINVAL;
 726                 err = rose_add_node(&rose_route, dev);
 727                 dev_put(dev);
 728                 return err;
 729
 730         case SIOCDELRT:
 731                 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
 732                         return -EFAULT;
 733                 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
 734                         return -EINVAL;
 735                 err = rose_del_node(&rose_route, dev);
 736                 dev_put(dev);
 737                 return err;
 738
 739         case SIOCRSCLRRT:
 740                 return rose_clear_routes();
 741
 742         default:
 743                 return -EINVAL;
 744         }
 745
 746         return 0;
 747 }
 748
 749 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
 750 {
 751         struct rose_route *rose_route, *s;
 752
 753         rose_neigh->restarted = 0;
 754
 755         rose_stop_t0timer(rose_neigh);
 756         rose_start_ftimer(rose_neigh);
 757
 758         skb_queue_purge(&rose_neigh->queue);
 759
 760         spin_lock_bh(&rose_route_list_lock);
 761
 762         rose_route = rose_route_list;
 763
 764         while (rose_route != NULL) {
 765                 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
 766                     (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL)       ||
 767                     (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
 768                         s = rose_route->next;
 769                         rose_remove_route(rose_route);
 770                         rose_route = s;
 771                         continue;
 772                 }
 773
 774                 if (rose_route->neigh1 == rose_neigh) {
 775                         rose_route->neigh1->use--;
 776                         rose_route->neigh1 = NULL;
 777                         rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
 778                 }
 779
 780                 if (rose_route->neigh2 == rose_neigh) {
 781                         rose_route->neigh2->use--;
 782                         rose_route->neigh2 = NULL;
 783                         rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
 784                 }
 785
 786                 rose_route = rose_route->next;
 787         }
 788         spin_unlock_bh(&rose_route_list_lock);
 789 }
 790
 791 /*
 792  *      A level 2 link has timed out, therefore it appears to be a poor link,
 793  *      then don't use that neighbour until it is reset. Blow away all through
 794  *      routes and connections using this route.
 795  */
 796 void rose_link_failed(ax25_cb *ax25, int reason)
 797 {
 798         struct rose_neigh *rose_neigh;
 799
 800         spin_lock_bh(&rose_neigh_list_lock);
 801         rose_neigh = rose_neigh_list;
 802         while (rose_neigh != NULL) {
 803                 if (rose_neigh->ax25 == ax25)
 804                         break;
 805                 rose_neigh = rose_neigh->next;
 806         }
 807
 808         if (rose_neigh != NULL) {
 809                 rose_neigh->ax25 = NULL;
 810
 811                 rose_del_route_by_neigh(rose_neigh);
 812                 rose_kill_by_neigh(rose_neigh);
 813         }
 814         spin_unlock_bh(&rose_neigh_list_lock);
 815 }
 816
 817 /*
 818  *      A device has been "downed" remove its link status. Blow away all
 819  *      through routes and connections that use this device.
 820  */
 821 void rose_link_device_down(struct net_device *dev)
 822 {
 823         struct rose_neigh *rose_neigh;
 824
 825         for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
 826                 if (rose_neigh->dev == dev) {
 827                         rose_del_route_by_neigh(rose_neigh);
 828                         rose_kill_by_neigh(rose_neigh);
 829                 }
 830         }
 831 }
 832
 833 /*
 834  *      Route a frame to an appropriate AX.25 connection.
 835  */
 836 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
 837 {
 838         struct rose_neigh *rose_neigh, *new_neigh;
 839         struct rose_route *rose_route;
 840         struct rose_facilities_struct facilities;
 841         rose_address *src_addr, *dest_addr;
 842         struct sock *sk;
 843         unsigned short frametype;
 844         unsigned int lci, new_lci;
 845         unsigned char cause, diagnostic;
 846         struct net_device *dev;
 847         int len, res = 0;
 848         char buf[11];
 849
 850 #if 0
 851         if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
 852                 return res;
 853 #endif
 854
 855         frametype = skb->data[2];
 856         lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
 857         src_addr  = (rose_address *)(skb->data + 9);
 858         dest_addr = (rose_address *)(skb->data + 4);
 859
 860         spin_lock_bh(&rose_neigh_list_lock);
 861         spin_lock_bh(&rose_route_list_lock);
 862
 863         rose_neigh = rose_neigh_list;
 864         while (rose_neigh != NULL) {
 865                 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
 866                     ax25->ax25_dev->dev == rose_neigh->dev)
 867                         break;
 868                 rose_neigh = rose_neigh->next;
 869         }
 870
 871         if (rose_neigh == NULL) {
 872                 printk("rose_route : unknown neighbour or device %s\n",
 873                        ax2asc(buf, &ax25->dest_addr));
 874                 goto out;
 875         }
 876
 877         /*
 878          *      Obviously the link is working, halt the ftimer.
 879          */
 880         rose_stop_ftimer(rose_neigh);
 881
 882         /*
 883          *      LCI of zero is always for us, and its always a restart
 884          *      frame.
 885          */
 886         if (lci == 0) {
 887                 rose_link_rx_restart(skb, rose_neigh, frametype);
 888                 goto out;
 889         }
 890
 891         /*
 892          *      Find an existing socket.
 893          */
 894         if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
 895                 if (frametype == ROSE_CALL_REQUEST) {
 896                         struct rose_sock *rose = rose_sk(sk);
 897
 898                         /* Remove an existing unused socket */
 899                         rose_clear_queues(sk);
 900                         rose->cause      = ROSE_NETWORK_CONGESTION;
 901                         rose->diagnostic = 0;
 902                         rose->neighbour->use--;
 903                         rose->neighbour  = NULL;
 904                         rose->lci        = 0;
 905                         rose->state      = ROSE_STATE_0;
 906                         sk->sk_state     = TCP_CLOSE;
 907                         sk->sk_err       = 0;
 908                         sk->sk_shutdown  |= SEND_SHUTDOWN;
 909                         if (!sock_flag(sk, SOCK_DEAD)) {
 910                                 sk->sk_state_change(sk);
 911                                 sock_set_flag(sk, SOCK_DEAD);
 912                         }
 913                 }
 914                 else {
 915                         skb_reset_transport_header(skb);
 916                         res = rose_process_rx_frame(sk, skb);
 917                         goto out;
 918                 }
 919         }
 920
 921         /*
 922          *      Is is a Call Request and is it for us ?
 923          */
 924         if (frametype == ROSE_CALL_REQUEST)
 925                 if ((dev = rose_dev_get(dest_addr)) != NULL) {
 926                         res = rose_rx_call_request(skb, dev, rose_neigh, lci);
 927                         dev_put(dev);
 928                         goto out;
 929                 }
 930
 931         if (!sysctl_rose_routing_control) {
 932                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
 933                 goto out;
 934         }
 935
 936         /*
 937          *      Route it to the next in line if we have an entry for it.
 938          */
 939         rose_route = rose_route_list;
 940         while (rose_route != NULL) {
 941                 if (rose_route->lci1 == lci &&
 942                     rose_route->neigh1 == rose_neigh) {
 943                         if (frametype == ROSE_CALL_REQUEST) {
 944                                 /* F6FBB - Remove an existing unused route */
 945                                 rose_remove_route(rose_route);
 946                                 break;
 947                         } else if (rose_route->neigh2 != NULL) {
 948                                 skb->data[0] &= 0xF0;
 949                                 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
 950                                 skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
 951                                 rose_transmit_link(skb, rose_route->neigh2);
 952                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 953                                         rose_remove_route(rose_route);
 954                                 res = 1;
 955                                 goto out;
 956                         } else {
 957                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 958                                         rose_remove_route(rose_route);
 959                                 goto out;
 960                         }
 961                 }
 962                 if (rose_route->lci2 == lci &&
 963                     rose_route->neigh2 == rose_neigh) {
 964                         if (frametype == ROSE_CALL_REQUEST) {
 965                                 /* F6FBB - Remove an existing unused route */
 966                                 rose_remove_route(rose_route);
 967                                 break;
 968                         } else if (rose_route->neigh1 != NULL) {
 969                                 skb->data[0] &= 0xF0;
 970                                 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
 971                                 skb->data[1]  = (rose_route->lci1 >> 0) & 0xFF;
 972                                 rose_transmit_link(skb, rose_route->neigh1);
 973                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 974                                         rose_remove_route(rose_route);
 975                                 res = 1;
 976                                 goto out;
 977                         } else {
 978                                 if (frametype == ROSE_CLEAR_CONFIRMATION)
 979                                         rose_remove_route(rose_route);
 980                                 goto out;
 981                         }
 982                 }
 983                 rose_route = rose_route->next;
 984         }
 985
 986         /*
 987          *      We know that:
 988          *      1. The frame isn't for us,
 989          *      2. It isn't "owned" by any existing route.
 990          */
 991         if (frametype != ROSE_CALL_REQUEST) {   /* XXX */
 992                 res = 0;
 993                 goto out;
 994         }
 995
 996         len  = (((skb->data[3] >> 4) & 0x0F) + 1) >> 1;
 997         len += (((skb->data[3] >> 0) & 0x0F) + 1) >> 1;
 998
 999         memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1000
1001         if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
1002                 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1003                 goto out;
1004         }
1005
1006         /*
1007          *      Check for routing loops.
1008          */
1009         rose_route = rose_route_list;
1010         while (rose_route != NULL) {
1011                 if (rose_route->rand == facilities.rand &&
1012                     rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1013                     ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1014                     ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1015                         rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1016                         goto out;
1017                 }
1018                 rose_route = rose_route->next;
1019         }
1020
1021         if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == NULL) {
1022                 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1023                 goto out;
1024         }
1025
1026         if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1027                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1028                 goto out;
1029         }
1030
1031         if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1032                 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1033                 goto out;
1034         }
1035
1036         rose_route->lci1      = lci;
1037         rose_route->src_addr  = *src_addr;
1038         rose_route->dest_addr = *dest_addr;
1039         rose_route->src_call  = facilities.dest_call;
1040         rose_route->dest_call = facilities.source_call;
1041         rose_route->rand      = facilities.rand;
1042         rose_route->neigh1    = rose_neigh;
1043         rose_route->lci2      = new_lci;
1044         rose_route->neigh2    = new_neigh;
1045
1046         rose_route->neigh1->use++;
1047         rose_route->neigh2->use++;
1048
1049         rose_route->next = rose_route_list;
1050         rose_route_list  = rose_route;
1051
1052         skb->data[0] &= 0xF0;
1053         skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1054         skb->data[1]  = (rose_route->lci2 >> 0) & 0xFF;
1055
1056         rose_transmit_link(skb, rose_route->neigh2);
1057         res = 1;
1058
1059 out:
1060         spin_unlock_bh(&rose_route_list_lock);
1061         spin_unlock_bh(&rose_neigh_list_lock);
1062
1063         return res;
1064 }
1065
1066 #ifdef CONFIG_PROC_FS
1067
1068 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1069         __acquires(rose_node_list_lock)
1070 {
1071         struct rose_node *rose_node;
1072         int i = 1;
1073
1074         spin_lock_bh(&rose_node_list_lock);
1075         if (*pos == 0)
1076                 return SEQ_START_TOKEN;
1077
1078         for (rose_node = rose_node_list; rose_node && i < *pos;
1079              rose_node = rose_node->next, ++i);
1080
1081         return (i == *pos) ? rose_node : NULL;
1082 }
1083
1084 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1085 {
1086         ++*pos;
1087
1088         return (v == SEQ_START_TOKEN) ? rose_node_list
1089                 : ((struct rose_node *)v)->next;
1090 }
1091
1092 static void rose_node_stop(struct seq_file *seq, void *v)
1093         __releases(rose_node_list_lock)
1094 {
1095         spin_unlock_bh(&rose_node_list_lock);
1096 }
1097
1098 static int rose_node_show(struct seq_file *seq, void *v)
1099 {
1100         int i;
1101
1102         if (v == SEQ_START_TOKEN)
1103                 seq_puts(seq, "address    mask n neigh neigh neigh\n");
1104         else {
1105                 const struct rose_node *rose_node = v;
1106                 /* if (rose_node->loopback) {
1107                         seq_printf(seq, "%-10s %04d 1 loopback\n",
1108                                 rose2asc(&rose_node->address),
1109                                 rose_node->mask);
1110                 } else { */
1111                         seq_printf(seq, "%-10s %04d %d",
1112                                 rose2asc(&rose_node->address),
1113                                 rose_node->mask,
1114                                 rose_node->count);
1115
1116                         for (i = 0; i < rose_node->count; i++)
1117                                 seq_printf(seq, " %05d",
1118                                         rose_node->neighbour[i]->number);
1119
1120                         seq_puts(seq, "\n");
1121                 /* } */
1122         }
1123         return 0;
1124 }
1125
1126 static const struct seq_operations rose_node_seqops = {
1127         .start = rose_node_start,
1128         .next = rose_node_next,
1129         .stop = rose_node_stop,
1130         .show = rose_node_show,
1131 };
1132
1133 static int rose_nodes_open(struct inode *inode, struct file *file)
1134 {
1135         return seq_open(file, &rose_node_seqops);
1136 }
1137
1138 const struct file_operations rose_nodes_fops = {
1139         .owner = THIS_MODULE,
1140         .open = rose_nodes_open,
1141         .read = seq_read,
1142         .llseek = seq_lseek,
1143         .release = seq_release,
1144 };
1145
1146 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1147         __acquires(rose_neigh_list_lock)
1148 {
1149         struct rose_neigh *rose_neigh;
1150         int i = 1;
1151
1152         spin_lock_bh(&rose_neigh_list_lock);
1153         if (*pos == 0)
1154                 return SEQ_START_TOKEN;
1155
1156         for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1157              rose_neigh = rose_neigh->next, ++i);
1158
1159         return (i == *pos) ? rose_neigh : NULL;
1160 }
1161
1162 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1163 {
1164         ++*pos;
1165
1166         return (v == SEQ_START_TOKEN) ? rose_neigh_list
1167                 : ((struct rose_neigh *)v)->next;
1168 }
1169
1170 static void rose_neigh_stop(struct seq_file *seq, void *v)
1171         __releases(rose_neigh_list_lock)
1172 {
1173         spin_unlock_bh(&rose_neigh_list_lock);
1174 }
1175
1176 static int rose_neigh_show(struct seq_file *seq, void *v)
1177 {
1178         char buf[11];
1179         int i;
1180
1181         if (v == SEQ_START_TOKEN)
1182                 seq_puts(seq,
1183                          "addr  callsign  dev  count use mode restart  t0  tf digipeaters\n");
1184         else {
1185                 struct rose_neigh *rose_neigh = v;
1186
1187                 /* if (!rose_neigh->loopback) { */
1188                 seq_printf(seq, "%05d %-9s %-4s   %3d %3d  %3s     %3s %3lu %3lu",
1189                            rose_neigh->number,
1190                            (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1191                            rose_neigh->dev ? rose_neigh->dev->name : "???",
1192                            rose_neigh->count,
1193                            rose_neigh->use,
1194                            (rose_neigh->dce_mode) ? "DCE" : "DTE",
1195                            (rose_neigh->restarted) ? "yes" : "no",
1196                            ax25_display_timer(&rose_neigh->t0timer) / HZ,
1197                            ax25_display_timer(&rose_neigh->ftimer)  / HZ);
1198
1199                 if (rose_neigh->digipeat != NULL) {
1200                         for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1201                                 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1202                 }
1203
1204                 seq_puts(seq, "\n");
1205         }
1206         return 0;
1207 }
1208
1209
1210 static const struct seq_operations rose_neigh_seqops = {
1211         .start = rose_neigh_start,
1212         .next = rose_neigh_next,
1213         .stop = rose_neigh_stop,
1214         .show = rose_neigh_show,
1215 };
1216
1217 static int rose_neigh_open(struct inode *inode, struct file *file)
1218 {
1219         return seq_open(file, &rose_neigh_seqops);
1220 }
1221
1222 const struct file_operations rose_neigh_fops = {
1223         .owner = THIS_MODULE,
1224         .open = rose_neigh_open,
1225         .read = seq_read,
1226         .llseek = seq_lseek,
1227         .release = seq_release,
1228 };
1229
1230
1231 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1232         __acquires(rose_route_list_lock)
1233 {
1234         struct rose_route *rose_route;
1235         int i = 1;
1236
1237         spin_lock_bh(&rose_route_list_lock);
1238         if (*pos == 0)
1239                 return SEQ_START_TOKEN;
1240
1241         for (rose_route = rose_route_list; rose_route && i < *pos;
1242              rose_route = rose_route->next, ++i);
1243
1244         return (i == *pos) ? rose_route : NULL;
1245 }
1246
1247 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1248 {
1249         ++*pos;
1250
1251         return (v == SEQ_START_TOKEN) ? rose_route_list
1252                 : ((struct rose_route *)v)->next;
1253 }
1254
1255 static void rose_route_stop(struct seq_file *seq, void *v)
1256         __releases(rose_route_list_lock)
1257 {
1258         spin_unlock_bh(&rose_route_list_lock);
1259 }
1260
1261 static int rose_route_show(struct seq_file *seq, void *v)
1262 {
1263         char buf[11];
1264
1265         if (v == SEQ_START_TOKEN)
1266                 seq_puts(seq,
1267                          "lci  address     callsign   neigh  <-> lci  address     callsign   neigh\n");
1268         else {
1269                 struct rose_route *rose_route = v;
1270
1271                 if (rose_route->neigh1)
1272                         seq_printf(seq,
1273                                    "%3.3X  %-10s  %-9s  %05d      ",
1274                                    rose_route->lci1,
1275                                    rose2asc(&rose_route->src_addr),
1276                                    ax2asc(buf, &rose_route->src_call),
1277                                    rose_route->neigh1->number);
1278                 else
1279                         seq_puts(seq,
1280                                  "000  *           *          00000      ");
1281
1282                 if (rose_route->neigh2)
1283                         seq_printf(seq,
1284                                    "%3.3X  %-10s  %-9s  %05d\n",
1285                                 rose_route->lci2,
1286                                 rose2asc(&rose_route->dest_addr),
1287                                 ax2asc(buf, &rose_route->dest_call),
1288                                 rose_route->neigh2->number);
1289                  else
1290                          seq_puts(seq,
1291                                   "000  *           *          00000\n");
1292                 }
1293         return 0;
1294 }
1295
1296 static const struct seq_operations rose_route_seqops = {
1297         .start = rose_route_start,
1298         .next = rose_route_next,
1299         .stop = rose_route_stop,
1300         .show = rose_route_show,
1301 };
1302
1303 static int rose_route_open(struct inode *inode, struct file *file)
1304 {
1305         return seq_open(file, &rose_route_seqops);
1306 }
1307
1308 const struct file_operations rose_routes_fops = {
1309         .owner = THIS_MODULE,
1310         .open = rose_route_open,
1311         .read = seq_read,
1312         .llseek = seq_lseek,
1313         .release = seq_release,
1314 };
1315
1316 #endif /* CONFIG_PROC_FS */
1317
1318 /*
1319  *      Release all memory associated with ROSE routing structures.
1320  */
1321 void __exit rose_rt_free(void)
1322 {
1323         struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1324         struct rose_node  *t, *rose_node  = rose_node_list;
1325         struct rose_route *u, *rose_route = rose_route_list;
1326
1327         while (rose_neigh != NULL) {
1328                 s          = rose_neigh;
1329                 rose_neigh = rose_neigh->next;
1330
1331                 rose_remove_neigh(s);
1332         }
1333
1334         while (rose_node != NULL) {
1335                 t         = rose_node;
1336                 rose_node = rose_node->next;
1337
1338                 rose_remove_node(t);
1339         }
1340
1341         while (rose_route != NULL) {
1342                 u          = rose_route;
1343                 rose_route = rose_route->next;
1344
1345                 rose_remove_route(u);
1346         }
1347 }