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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / rose / rose_route.c
blobfb9359fb2358f243b4904bd52f642dee30ad9b55
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_node_list_lock);
861 spin_lock_bh(&rose_neigh_list_lock);
862 spin_lock_bh(&rose_route_list_lock);
863
864 rose_neigh = rose_neigh_list;
865 while (rose_neigh != NULL) {
866 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
867 ax25->ax25_dev->dev == rose_neigh->dev)
868 break;
869 rose_neigh = rose_neigh->next;
870 }
871
872 if (rose_neigh == NULL) {
873 printk("rose_route : unknown neighbour or device %s\n",
874 ax2asc(buf, &ax25->dest_addr));
875 goto out;
876 }
877
878 /*
879 * Obviously the link is working, halt the ftimer.
880 */
881 rose_stop_ftimer(rose_neigh);
882
883 /*
884 * LCI of zero is always for us, and its always a restart
885 * frame.
886 */
887 if (lci == 0) {
888 rose_link_rx_restart(skb, rose_neigh, frametype);
889 goto out;
890 }
891
892 /*
893 * Find an existing socket.
894 */
895 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
896 if (frametype == ROSE_CALL_REQUEST) {
897 struct rose_sock *rose = rose_sk(sk);
898
899 /* Remove an existing unused socket */
900 rose_clear_queues(sk);
901 rose->cause = ROSE_NETWORK_CONGESTION;
902 rose->diagnostic = 0;
903 rose->neighbour->use--;
904 rose->neighbour = NULL;
905 rose->lci = 0;
906 rose->state = ROSE_STATE_0;
907 sk->sk_state = TCP_CLOSE;
908 sk->sk_err = 0;
909 sk->sk_shutdown |= SEND_SHUTDOWN;
910 if (!sock_flag(sk, SOCK_DEAD)) {
911 sk->sk_state_change(sk);
912 sock_set_flag(sk, SOCK_DEAD);
913 }
914 }
915 else {
916 skb_reset_transport_header(skb);
917 res = rose_process_rx_frame(sk, skb);
918 goto out;
919 }
920 }
921
922 /*
923 * Is is a Call Request and is it for us ?
924 */
925 if (frametype == ROSE_CALL_REQUEST)
926 if ((dev = rose_dev_get(dest_addr)) != NULL) {
927 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
928 dev_put(dev);
929 goto out;
930 }
931
932 if (!sysctl_rose_routing_control) {
933 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
934 goto out;
935 }
936
937 /*
938 * Route it to the next in line if we have an entry for it.
939 */
940 rose_route = rose_route_list;
941 while (rose_route != NULL) {
942 if (rose_route->lci1 == lci &&
943 rose_route->neigh1 == rose_neigh) {
944 if (frametype == ROSE_CALL_REQUEST) {
945 /* F6FBB - Remove an existing unused route */
946 rose_remove_route(rose_route);
947 break;
948 } else if (rose_route->neigh2 != NULL) {
949 skb->data[0] &= 0xF0;
950 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
951 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
952 rose_transmit_link(skb, rose_route->neigh2);
953 if (frametype == ROSE_CLEAR_CONFIRMATION)
954 rose_remove_route(rose_route);
955 res = 1;
956 goto out;
957 } else {
958 if (frametype == ROSE_CLEAR_CONFIRMATION)
959 rose_remove_route(rose_route);
960 goto out;
961 }
962 }
963 if (rose_route->lci2 == lci &&
964 rose_route->neigh2 == rose_neigh) {
965 if (frametype == ROSE_CALL_REQUEST) {
966 /* F6FBB - Remove an existing unused route */
967 rose_remove_route(rose_route);
968 break;
969 } else if (rose_route->neigh1 != NULL) {
970 skb->data[0] &= 0xF0;
971 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
972 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
973 rose_transmit_link(skb, rose_route->neigh1);
974 if (frametype == ROSE_CLEAR_CONFIRMATION)
975 rose_remove_route(rose_route);
976 res = 1;
977 goto out;
978 } else {
979 if (frametype == ROSE_CLEAR_CONFIRMATION)
980 rose_remove_route(rose_route);
981 goto out;
982 }
983 }
984 rose_route = rose_route->next;
985 }
986
987 /*
988 * We know that:
989 * 1. The frame isn't for us,
990 * 2. It isn't "owned" by any existing route.
991 */
992 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
993 res = 0;
994 goto out;
995 }
996
997 len = (((skb->data[3] >> 4) & 0x0F) + 1) >> 1;
998 len += (((skb->data[3] >> 0) & 0x0F) + 1) >> 1;
999
1000 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1001
1002 if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
1003 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1004 goto out;
1005 }
1006
1007 /*
1008 * Check for routing loops.
1009 */
1010 rose_route = rose_route_list;
1011 while (rose_route != NULL) {
1012 if (rose_route->rand == facilities.rand &&
1013 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1014 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1015 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1016 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1017 goto out;
1018 }
1019 rose_route = rose_route->next;
1020 }
1021
1022 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == NULL) {
1023 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1024 goto out;
1025 }
1026
1027 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1028 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1029 goto out;
1030 }
1031
1032 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1033 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1034 goto out;
1035 }
1036
1037 rose_route->lci1 = lci;
1038 rose_route->src_addr = *src_addr;
1039 rose_route->dest_addr = *dest_addr;
1040 rose_route->src_call = facilities.dest_call;
1041 rose_route->dest_call = facilities.source_call;
1042 rose_route->rand = facilities.rand;
1043 rose_route->neigh1 = rose_neigh;
1044 rose_route->lci2 = new_lci;
1045 rose_route->neigh2 = new_neigh;
1046
1047 rose_route->neigh1->use++;
1048 rose_route->neigh2->use++;
1049
1050 rose_route->next = rose_route_list;
1051 rose_route_list = rose_route;
1052
1053 skb->data[0] &= 0xF0;
1054 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1055 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1056
1057 rose_transmit_link(skb, rose_route->neigh2);
1058 res = 1;
1059
1060 out:
1061 spin_unlock_bh(&rose_route_list_lock);
1062 spin_unlock_bh(&rose_neigh_list_lock);
1063 spin_unlock_bh(&rose_node_list_lock);
1064
1065 return res;
1066 }
1067
1068 #ifdef CONFIG_PROC_FS
1069
1070 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1071 __acquires(rose_neigh_list_lock)
1072 {
1073 struct rose_node *rose_node;
1074 int i = 1;
1075
1076 spin_lock_bh(&rose_neigh_list_lock);
1077 if (*pos == 0)
1078 return SEQ_START_TOKEN;
1079
1080 for (rose_node = rose_node_list; rose_node && i < *pos;
1081 rose_node = rose_node->next, ++i);
1082
1083 return (i == *pos) ? rose_node : NULL;
1084 }
1085
1086 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1087 {
1088 ++*pos;
1089
1090 return (v == SEQ_START_TOKEN) ? rose_node_list
1091 : ((struct rose_node *)v)->next;
1092 }
1093
1094 static void rose_node_stop(struct seq_file *seq, void *v)
1095 __releases(rose_neigh_list_lock)
1096 {
1097 spin_unlock_bh(&rose_neigh_list_lock);
1098 }
1099
1100 static int rose_node_show(struct seq_file *seq, void *v)
1101 {
1102 int i;
1103
1104 if (v == SEQ_START_TOKEN)
1105 seq_puts(seq, "address mask n neigh neigh neigh\n");
1106 else {
1107 const struct rose_node *rose_node = v;
1108 /* if (rose_node->loopback) {
1109 seq_printf(seq, "%-10s %04d 1 loopback\n",
1110 rose2asc(&rose_node->address),
1111 rose_node->mask);
1112 } else { */
1113 seq_printf(seq, "%-10s %04d %d",
1114 rose2asc(&rose_node->address),
1115 rose_node->mask,
1116 rose_node->count);
1117
1118 for (i = 0; i < rose_node->count; i++)
1119 seq_printf(seq, " %05d",
1120 rose_node->neighbour[i]->number);
1121
1122 seq_puts(seq, "\n");
1123 /* } */
1124 }
1125 return 0;
1126 }
1127
1128 static const struct seq_operations rose_node_seqops = {
1129 .start = rose_node_start,
1130 .next = rose_node_next,
1131 .stop = rose_node_stop,
1132 .show = rose_node_show,
1133 };
1134
1135 static int rose_nodes_open(struct inode *inode, struct file *file)
1136 {
1137 return seq_open(file, &rose_node_seqops);
1138 }
1139
1140 const struct file_operations rose_nodes_fops = {
1141 .owner = THIS_MODULE,
1142 .open = rose_nodes_open,
1143 .read = seq_read,
1144 .llseek = seq_lseek,
1145 .release = seq_release,
1146 };
1147
1148 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1149 __acquires(rose_neigh_list_lock)
1150 {
1151 struct rose_neigh *rose_neigh;
1152 int i = 1;
1153
1154 spin_lock_bh(&rose_neigh_list_lock);
1155 if (*pos == 0)
1156 return SEQ_START_TOKEN;
1157
1158 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1159 rose_neigh = rose_neigh->next, ++i);
1160
1161 return (i == *pos) ? rose_neigh : NULL;
1162 }
1163
1164 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1165 {
1166 ++*pos;
1167
1168 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1169 : ((struct rose_neigh *)v)->next;
1170 }
1171
1172 static void rose_neigh_stop(struct seq_file *seq, void *v)
1173 __releases(rose_neigh_list_lock)
1174 {
1175 spin_unlock_bh(&rose_neigh_list_lock);
1176 }
1177
1178 static int rose_neigh_show(struct seq_file *seq, void *v)
1179 {
1180 char buf[11];
1181 int i;
1182
1183 if (v == SEQ_START_TOKEN)
1184 seq_puts(seq,
1185 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1186 else {
1187 struct rose_neigh *rose_neigh = v;
1188
1189 /* if (!rose_neigh->loopback) { */
1190 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1191 rose_neigh->number,
1192 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1193 rose_neigh->dev ? rose_neigh->dev->name : "???",
1194 rose_neigh->count,
1195 rose_neigh->use,
1196 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1197 (rose_neigh->restarted) ? "yes" : "no",
1198 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1199 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1200
1201 if (rose_neigh->digipeat != NULL) {
1202 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1203 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1204 }
1205
1206 seq_puts(seq, "\n");
1207 }
1208 return 0;
1209 }
1210
1211
1212 static const struct seq_operations rose_neigh_seqops = {
1213 .start = rose_neigh_start,
1214 .next = rose_neigh_next,
1215 .stop = rose_neigh_stop,
1216 .show = rose_neigh_show,
1217 };
1218
1219 static int rose_neigh_open(struct inode *inode, struct file *file)
1220 {
1221 return seq_open(file, &rose_neigh_seqops);
1222 }
1223
1224 const struct file_operations rose_neigh_fops = {
1225 .owner = THIS_MODULE,
1226 .open = rose_neigh_open,
1227 .read = seq_read,
1228 .llseek = seq_lseek,
1229 .release = seq_release,
1230 };
1231
1232
1233 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1234 __acquires(rose_route_list_lock)
1235 {
1236 struct rose_route *rose_route;
1237 int i = 1;
1238
1239 spin_lock_bh(&rose_route_list_lock);
1240 if (*pos == 0)
1241 return SEQ_START_TOKEN;
1242
1243 for (rose_route = rose_route_list; rose_route && i < *pos;
1244 rose_route = rose_route->next, ++i);
1245
1246 return (i == *pos) ? rose_route : NULL;
1247 }
1248
1249 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1250 {
1251 ++*pos;
1252
1253 return (v == SEQ_START_TOKEN) ? rose_route_list
1254 : ((struct rose_route *)v)->next;
1255 }
1256
1257 static void rose_route_stop(struct seq_file *seq, void *v)
1258 __releases(rose_route_list_lock)
1259 {
1260 spin_unlock_bh(&rose_route_list_lock);
1261 }
1262
1263 static int rose_route_show(struct seq_file *seq, void *v)
1264 {
1265 char buf[11];
1266
1267 if (v == SEQ_START_TOKEN)
1268 seq_puts(seq,
1269 "lci address callsign neigh <-> lci address callsign neigh\n");
1270 else {
1271 struct rose_route *rose_route = v;
1272
1273 if (rose_route->neigh1)
1274 seq_printf(seq,
1275 "%3.3X %-10s %-9s %05d ",
1276 rose_route->lci1,
1277 rose2asc(&rose_route->src_addr),
1278 ax2asc(buf, &rose_route->src_call),
1279 rose_route->neigh1->number);
1280 else
1281 seq_puts(seq,
1282 "000 * * 00000 ");
1283
1284 if (rose_route->neigh2)
1285 seq_printf(seq,
1286 "%3.3X %-10s %-9s %05d\n",
1287 rose_route->lci2,
1288 rose2asc(&rose_route->dest_addr),
1289 ax2asc(buf, &rose_route->dest_call),
1290 rose_route->neigh2->number);
1291 else
1292 seq_puts(seq,
1293 "000 * * 00000\n");
1294 }
1295 return 0;
1296 }
1297
1298 static const struct seq_operations rose_route_seqops = {
1299 .start = rose_route_start,
1300 .next = rose_route_next,
1301 .stop = rose_route_stop,
1302 .show = rose_route_show,
1303 };
1304
1305 static int rose_route_open(struct inode *inode, struct file *file)
1306 {
1307 return seq_open(file, &rose_route_seqops);
1308 }
1309
1310 const struct file_operations rose_routes_fops = {
1311 .owner = THIS_MODULE,
1312 .open = rose_route_open,
1313 .read = seq_read,
1314 .llseek = seq_lseek,
1315 .release = seq_release,
1316 };
1317
1318 #endif /* CONFIG_PROC_FS */
1319
1320 /*
1321 * Release all memory associated with ROSE routing structures.
1322 */
1323 void __exit rose_rt_free(void)
1324 {
1325 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1326 struct rose_node *t, *rose_node = rose_node_list;
1327 struct rose_route *u, *rose_route = rose_route_list;
1328
1329 while (rose_neigh != NULL) {
1330 s = rose_neigh;
1331 rose_neigh = rose_neigh->next;
1332
1333 rose_remove_neigh(s);
1334 }
1335
1336 while (rose_node != NULL) {
1337 t = rose_node;
1338 rose_node = rose_node->next;
1339
1340 rose_remove_node(t);
1341 }
1342
1343 while (rose_route != NULL) {
1344 u = rose_route;
1345 rose_route = rose_route->next;
1346
1347 rose_remove_route(u);
1348 }
1349 }
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