Loading...
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 <linux/slab.h>
20#include <net/ax25.h>
21#include <linux/inet.h>
22#include <linux/netdevice.h>
23#include <net/arp.h>
24#include <linux/if_arp.h>
25#include <linux/skbuff.h>
26#include <net/sock.h>
27#include <net/tcp_states.h>
28#include <asm/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#include <linux/export.h>
39
40static unsigned int rose_neigh_no = 1;
41
42static struct rose_node *rose_node_list;
43static DEFINE_SPINLOCK(rose_node_list_lock);
44static struct rose_neigh *rose_neigh_list;
45static DEFINE_SPINLOCK(rose_neigh_list_lock);
46static struct rose_route *rose_route_list;
47static DEFINE_SPINLOCK(rose_route_list_lock);
48
49struct rose_neigh *rose_loopback_neigh;
50
51/*
52 * Add a new route to a node, and in the process add the node and the
53 * neighbour if it is new.
54 */
55static int __must_check rose_add_node(struct rose_route_struct *rose_route,
56 struct net_device *dev)
57{
58 struct rose_node *rose_node, *rose_tmpn, *rose_tmpp;
59 struct rose_neigh *rose_neigh;
60 int i, res = 0;
61
62 spin_lock_bh(&rose_node_list_lock);
63 spin_lock_bh(&rose_neigh_list_lock);
64
65 rose_node = rose_node_list;
66 while (rose_node != NULL) {
67 if ((rose_node->mask == rose_route->mask) &&
68 (rosecmpm(&rose_route->address, &rose_node->address,
69 rose_route->mask) == 0))
70 break;
71 rose_node = rose_node->next;
72 }
73
74 if (rose_node != NULL && rose_node->loopback) {
75 res = -EINVAL;
76 goto out;
77 }
78
79 rose_neigh = rose_neigh_list;
80 while (rose_neigh != NULL) {
81 if (ax25cmp(&rose_route->neighbour,
82 &rose_neigh->callsign) == 0 &&
83 rose_neigh->dev == dev)
84 break;
85 rose_neigh = rose_neigh->next;
86 }
87
88 if (rose_neigh == NULL) {
89 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
90 if (rose_neigh == NULL) {
91 res = -ENOMEM;
92 goto out;
93 }
94
95 rose_neigh->callsign = rose_route->neighbour;
96 rose_neigh->digipeat = NULL;
97 rose_neigh->ax25 = NULL;
98 rose_neigh->dev = dev;
99 rose_neigh->count = 0;
100 rose_neigh->use = 0;
101 rose_neigh->dce_mode = 0;
102 rose_neigh->loopback = 0;
103 rose_neigh->number = rose_neigh_no++;
104 rose_neigh->restarted = 0;
105
106 skb_queue_head_init(&rose_neigh->queue);
107
108 init_timer(&rose_neigh->ftimer);
109 init_timer(&rose_neigh->t0timer);
110
111 if (rose_route->ndigis != 0) {
112 rose_neigh->digipeat =
113 kmalloc(sizeof(ax25_digi), GFP_ATOMIC);
114 if (rose_neigh->digipeat == NULL) {
115 kfree(rose_neigh);
116 res = -ENOMEM;
117 goto out;
118 }
119
120 rose_neigh->digipeat->ndigi = rose_route->ndigis;
121 rose_neigh->digipeat->lastrepeat = -1;
122
123 for (i = 0; i < rose_route->ndigis; i++) {
124 rose_neigh->digipeat->calls[i] =
125 rose_route->digipeaters[i];
126 rose_neigh->digipeat->repeated[i] = 0;
127 }
128 }
129
130 rose_neigh->next = rose_neigh_list;
131 rose_neigh_list = rose_neigh;
132 }
133
134 /*
135 * This is a new node to be inserted into the list. Find where it needs
136 * to be inserted into the list, and insert it. We want to be sure
137 * to order the list in descending order of mask size to ensure that
138 * later when we are searching this list the first match will be the
139 * best match.
140 */
141 if (rose_node == NULL) {
142 rose_tmpn = rose_node_list;
143 rose_tmpp = NULL;
144
145 while (rose_tmpn != NULL) {
146 if (rose_tmpn->mask > rose_route->mask) {
147 rose_tmpp = rose_tmpn;
148 rose_tmpn = rose_tmpn->next;
149 } else {
150 break;
151 }
152 }
153
154 /* create new node */
155 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
156 if (rose_node == NULL) {
157 res = -ENOMEM;
158 goto out;
159 }
160
161 rose_node->address = rose_route->address;
162 rose_node->mask = rose_route->mask;
163 rose_node->count = 1;
164 rose_node->loopback = 0;
165 rose_node->neighbour[0] = rose_neigh;
166
167 if (rose_tmpn == NULL) {
168 if (rose_tmpp == NULL) { /* Empty list */
169 rose_node_list = rose_node;
170 rose_node->next = NULL;
171 } else {
172 rose_tmpp->next = rose_node;
173 rose_node->next = NULL;
174 }
175 } else {
176 if (rose_tmpp == NULL) { /* 1st node */
177 rose_node->next = rose_node_list;
178 rose_node_list = rose_node;
179 } else {
180 rose_tmpp->next = rose_node;
181 rose_node->next = rose_tmpn;
182 }
183 }
184 rose_neigh->count++;
185
186 goto out;
187 }
188
189 /* We have space, slot it in */
190 if (rose_node->count < 3) {
191 rose_node->neighbour[rose_node->count] = rose_neigh;
192 rose_node->count++;
193 rose_neigh->count++;
194 }
195
196out:
197 spin_unlock_bh(&rose_neigh_list_lock);
198 spin_unlock_bh(&rose_node_list_lock);
199
200 return res;
201}
202
203/*
204 * Caller is holding rose_node_list_lock.
205 */
206static void rose_remove_node(struct rose_node *rose_node)
207{
208 struct rose_node *s;
209
210 if ((s = rose_node_list) == rose_node) {
211 rose_node_list = rose_node->next;
212 kfree(rose_node);
213 return;
214 }
215
216 while (s != NULL && s->next != NULL) {
217 if (s->next == rose_node) {
218 s->next = rose_node->next;
219 kfree(rose_node);
220 return;
221 }
222
223 s = s->next;
224 }
225}
226
227/*
228 * Caller is holding rose_neigh_list_lock.
229 */
230static void rose_remove_neigh(struct rose_neigh *rose_neigh)
231{
232 struct rose_neigh *s;
233
234 rose_stop_ftimer(rose_neigh);
235 rose_stop_t0timer(rose_neigh);
236
237 skb_queue_purge(&rose_neigh->queue);
238
239 if ((s = rose_neigh_list) == rose_neigh) {
240 rose_neigh_list = rose_neigh->next;
241 if (rose_neigh->ax25)
242 ax25_cb_put(rose_neigh->ax25);
243 kfree(rose_neigh->digipeat);
244 kfree(rose_neigh);
245 return;
246 }
247
248 while (s != NULL && s->next != NULL) {
249 if (s->next == rose_neigh) {
250 s->next = rose_neigh->next;
251 if (rose_neigh->ax25)
252 ax25_cb_put(rose_neigh->ax25);
253 kfree(rose_neigh->digipeat);
254 kfree(rose_neigh);
255 return;
256 }
257
258 s = s->next;
259 }
260}
261
262/*
263 * Caller is holding rose_route_list_lock.
264 */
265static void rose_remove_route(struct rose_route *rose_route)
266{
267 struct rose_route *s;
268
269 if (rose_route->neigh1 != NULL)
270 rose_route->neigh1->use--;
271
272 if (rose_route->neigh2 != NULL)
273 rose_route->neigh2->use--;
274
275 if ((s = rose_route_list) == rose_route) {
276 rose_route_list = rose_route->next;
277 kfree(rose_route);
278 return;
279 }
280
281 while (s != NULL && s->next != NULL) {
282 if (s->next == rose_route) {
283 s->next = rose_route->next;
284 kfree(rose_route);
285 return;
286 }
287
288 s = s->next;
289 }
290}
291
292/*
293 * "Delete" a node. Strictly speaking remove a route to a node. The node
294 * is only deleted if no routes are left to it.
295 */
296static int rose_del_node(struct rose_route_struct *rose_route,
297 struct net_device *dev)
298{
299 struct rose_node *rose_node;
300 struct rose_neigh *rose_neigh;
301 int i, err = 0;
302
303 spin_lock_bh(&rose_node_list_lock);
304 spin_lock_bh(&rose_neigh_list_lock);
305
306 rose_node = rose_node_list;
307 while (rose_node != NULL) {
308 if ((rose_node->mask == rose_route->mask) &&
309 (rosecmpm(&rose_route->address, &rose_node->address,
310 rose_route->mask) == 0))
311 break;
312 rose_node = rose_node->next;
313 }
314
315 if (rose_node == NULL || rose_node->loopback) {
316 err = -EINVAL;
317 goto out;
318 }
319
320 rose_neigh = rose_neigh_list;
321 while (rose_neigh != NULL) {
322 if (ax25cmp(&rose_route->neighbour,
323 &rose_neigh->callsign) == 0 &&
324 rose_neigh->dev == dev)
325 break;
326 rose_neigh = rose_neigh->next;
327 }
328
329 if (rose_neigh == NULL) {
330 err = -EINVAL;
331 goto out;
332 }
333
334 for (i = 0; i < rose_node->count; i++) {
335 if (rose_node->neighbour[i] == rose_neigh) {
336 rose_neigh->count--;
337
338 if (rose_neigh->count == 0 && rose_neigh->use == 0)
339 rose_remove_neigh(rose_neigh);
340
341 rose_node->count--;
342
343 if (rose_node->count == 0) {
344 rose_remove_node(rose_node);
345 } else {
346 switch (i) {
347 case 0:
348 rose_node->neighbour[0] =
349 rose_node->neighbour[1];
350 case 1:
351 rose_node->neighbour[1] =
352 rose_node->neighbour[2];
353 case 2:
354 break;
355 }
356 }
357 goto out;
358 }
359 }
360 err = -EINVAL;
361
362out:
363 spin_unlock_bh(&rose_neigh_list_lock);
364 spin_unlock_bh(&rose_node_list_lock);
365
366 return err;
367}
368
369/*
370 * Add the loopback neighbour.
371 */
372void rose_add_loopback_neigh(void)
373{
374 struct rose_neigh *sn;
375
376 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL);
377 if (!rose_loopback_neigh)
378 return;
379 sn = rose_loopback_neigh;
380
381 sn->callsign = null_ax25_address;
382 sn->digipeat = NULL;
383 sn->ax25 = NULL;
384 sn->dev = NULL;
385 sn->count = 0;
386 sn->use = 0;
387 sn->dce_mode = 1;
388 sn->loopback = 1;
389 sn->number = rose_neigh_no++;
390 sn->restarted = 1;
391
392 skb_queue_head_init(&sn->queue);
393
394 init_timer(&sn->ftimer);
395 init_timer(&sn->t0timer);
396
397 spin_lock_bh(&rose_neigh_list_lock);
398 sn->next = rose_neigh_list;
399 rose_neigh_list = sn;
400 spin_unlock_bh(&rose_neigh_list_lock);
401}
402
403/*
404 * Add a loopback node.
405 */
406int rose_add_loopback_node(rose_address *address)
407{
408 struct rose_node *rose_node;
409 int err = 0;
410
411 spin_lock_bh(&rose_node_list_lock);
412
413 rose_node = rose_node_list;
414 while (rose_node != NULL) {
415 if ((rose_node->mask == 10) &&
416 (rosecmpm(address, &rose_node->address, 10) == 0) &&
417 rose_node->loopback)
418 break;
419 rose_node = rose_node->next;
420 }
421
422 if (rose_node != NULL)
423 goto out;
424
425 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
426 err = -ENOMEM;
427 goto out;
428 }
429
430 rose_node->address = *address;
431 rose_node->mask = 10;
432 rose_node->count = 1;
433 rose_node->loopback = 1;
434 rose_node->neighbour[0] = rose_loopback_neigh;
435
436 /* Insert at the head of list. Address is always mask=10 */
437 rose_node->next = rose_node_list;
438 rose_node_list = rose_node;
439
440 rose_loopback_neigh->count++;
441
442out:
443 spin_unlock_bh(&rose_node_list_lock);
444
445 return err;
446}
447
448/*
449 * Delete a loopback node.
450 */
451void rose_del_loopback_node(rose_address *address)
452{
453 struct rose_node *rose_node;
454
455 spin_lock_bh(&rose_node_list_lock);
456
457 rose_node = rose_node_list;
458 while (rose_node != NULL) {
459 if ((rose_node->mask == 10) &&
460 (rosecmpm(address, &rose_node->address, 10) == 0) &&
461 rose_node->loopback)
462 break;
463 rose_node = rose_node->next;
464 }
465
466 if (rose_node == NULL)
467 goto out;
468
469 rose_remove_node(rose_node);
470
471 rose_loopback_neigh->count--;
472
473out:
474 spin_unlock_bh(&rose_node_list_lock);
475}
476
477/*
478 * A device has been removed. Remove its routes and neighbours.
479 */
480void rose_rt_device_down(struct net_device *dev)
481{
482 struct rose_neigh *s, *rose_neigh;
483 struct rose_node *t, *rose_node;
484 int i;
485
486 spin_lock_bh(&rose_node_list_lock);
487 spin_lock_bh(&rose_neigh_list_lock);
488 rose_neigh = rose_neigh_list;
489 while (rose_neigh != NULL) {
490 s = rose_neigh;
491 rose_neigh = rose_neigh->next;
492
493 if (s->dev != dev)
494 continue;
495
496 rose_node = rose_node_list;
497
498 while (rose_node != NULL) {
499 t = rose_node;
500 rose_node = rose_node->next;
501
502 for (i = 0; i < t->count; i++) {
503 if (t->neighbour[i] != s)
504 continue;
505
506 t->count--;
507
508 switch (i) {
509 case 0:
510 t->neighbour[0] = t->neighbour[1];
511 case 1:
512 t->neighbour[1] = t->neighbour[2];
513 case 2:
514 break;
515 }
516 }
517
518 if (t->count <= 0)
519 rose_remove_node(t);
520 }
521
522 rose_remove_neigh(s);
523 }
524 spin_unlock_bh(&rose_neigh_list_lock);
525 spin_unlock_bh(&rose_node_list_lock);
526}
527
528#if 0 /* Currently unused */
529/*
530 * A device has been removed. Remove its links.
531 */
532void rose_route_device_down(struct net_device *dev)
533{
534 struct rose_route *s, *rose_route;
535
536 spin_lock_bh(&rose_route_list_lock);
537 rose_route = rose_route_list;
538 while (rose_route != NULL) {
539 s = rose_route;
540 rose_route = rose_route->next;
541
542 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
543 rose_remove_route(s);
544 }
545 spin_unlock_bh(&rose_route_list_lock);
546}
547#endif
548
549/*
550 * Clear all nodes and neighbours out, except for neighbours with
551 * active connections going through them.
552 * Do not clear loopback neighbour and nodes.
553 */
554static int rose_clear_routes(void)
555{
556 struct rose_neigh *s, *rose_neigh;
557 struct rose_node *t, *rose_node;
558
559 spin_lock_bh(&rose_node_list_lock);
560 spin_lock_bh(&rose_neigh_list_lock);
561
562 rose_neigh = rose_neigh_list;
563 rose_node = rose_node_list;
564
565 while (rose_node != NULL) {
566 t = rose_node;
567 rose_node = rose_node->next;
568 if (!t->loopback)
569 rose_remove_node(t);
570 }
571
572 while (rose_neigh != NULL) {
573 s = rose_neigh;
574 rose_neigh = rose_neigh->next;
575
576 if (s->use == 0 && !s->loopback) {
577 s->count = 0;
578 rose_remove_neigh(s);
579 }
580 }
581
582 spin_unlock_bh(&rose_neigh_list_lock);
583 spin_unlock_bh(&rose_node_list_lock);
584
585 return 0;
586}
587
588/*
589 * Check that the device given is a valid AX.25 interface that is "up".
590 * called with RTNL
591 */
592static struct net_device *rose_ax25_dev_find(char *devname)
593{
594 struct net_device *dev;
595
596 if ((dev = __dev_get_by_name(&init_net, devname)) == NULL)
597 return NULL;
598
599 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
600 return dev;
601
602 return NULL;
603}
604
605/*
606 * Find the first active ROSE device, usually "rose0".
607 */
608struct net_device *rose_dev_first(void)
609{
610 struct net_device *dev, *first = NULL;
611
612 rcu_read_lock();
613 for_each_netdev_rcu(&init_net, dev) {
614 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
615 if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
616 first = dev;
617 }
618 rcu_read_unlock();
619
620 return first;
621}
622
623/*
624 * Find the ROSE device for the given address.
625 */
626struct net_device *rose_dev_get(rose_address *addr)
627{
628 struct net_device *dev;
629
630 rcu_read_lock();
631 for_each_netdev_rcu(&init_net, dev) {
632 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
633 dev_hold(dev);
634 goto out;
635 }
636 }
637 dev = NULL;
638out:
639 rcu_read_unlock();
640 return dev;
641}
642
643static int rose_dev_exists(rose_address *addr)
644{
645 struct net_device *dev;
646
647 rcu_read_lock();
648 for_each_netdev_rcu(&init_net, dev) {
649 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
650 goto out;
651 }
652 dev = NULL;
653out:
654 rcu_read_unlock();
655 return dev != NULL;
656}
657
658
659
660
661struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
662{
663 struct rose_route *rose_route;
664
665 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
666 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
667 (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
668 return rose_route;
669
670 return NULL;
671}
672
673/*
674 * Find a neighbour or a route given a ROSE address.
675 */
676struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
677 unsigned char *diagnostic, int route_frame)
678{
679 struct rose_neigh *res = NULL;
680 struct rose_node *node;
681 int failed = 0;
682 int i;
683
684 if (!route_frame) spin_lock_bh(&rose_node_list_lock);
685 for (node = rose_node_list; node != NULL; node = node->next) {
686 if (rosecmpm(addr, &node->address, node->mask) == 0) {
687 for (i = 0; i < node->count; i++) {
688 if (node->neighbour[i]->restarted) {
689 res = node->neighbour[i];
690 goto out;
691 }
692 }
693 }
694 }
695 if (!route_frame) { /* connect request */
696 for (node = rose_node_list; node != NULL; node = node->next) {
697 if (rosecmpm(addr, &node->address, node->mask) == 0) {
698 for (i = 0; i < node->count; i++) {
699 if (!rose_ftimer_running(node->neighbour[i])) {
700 res = node->neighbour[i];
701 failed = 0;
702 goto out;
703 }
704 failed = 1;
705 }
706 }
707 }
708 }
709
710 if (failed) {
711 *cause = ROSE_OUT_OF_ORDER;
712 *diagnostic = 0;
713 } else {
714 *cause = ROSE_NOT_OBTAINABLE;
715 *diagnostic = 0;
716 }
717
718out:
719 if (!route_frame) spin_unlock_bh(&rose_node_list_lock);
720 return res;
721}
722
723/*
724 * Handle the ioctls that control the routing functions.
725 */
726int rose_rt_ioctl(unsigned int cmd, void __user *arg)
727{
728 struct rose_route_struct rose_route;
729 struct net_device *dev;
730 int err;
731
732 switch (cmd) {
733 case SIOCADDRT:
734 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
735 return -EFAULT;
736 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
737 return -EINVAL;
738 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */
739 return -EINVAL;
740 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
741 return -EINVAL;
742 if (rose_route.ndigis > AX25_MAX_DIGIS)
743 return -EINVAL;
744 err = rose_add_node(&rose_route, dev);
745 return err;
746
747 case SIOCDELRT:
748 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
749 return -EFAULT;
750 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
751 return -EINVAL;
752 err = rose_del_node(&rose_route, dev);
753 return err;
754
755 case SIOCRSCLRRT:
756 return rose_clear_routes();
757
758 default:
759 return -EINVAL;
760 }
761
762 return 0;
763}
764
765static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
766{
767 struct rose_route *rose_route, *s;
768
769 rose_neigh->restarted = 0;
770
771 rose_stop_t0timer(rose_neigh);
772 rose_start_ftimer(rose_neigh);
773
774 skb_queue_purge(&rose_neigh->queue);
775
776 spin_lock_bh(&rose_route_list_lock);
777
778 rose_route = rose_route_list;
779
780 while (rose_route != NULL) {
781 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
782 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) ||
783 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
784 s = rose_route->next;
785 rose_remove_route(rose_route);
786 rose_route = s;
787 continue;
788 }
789
790 if (rose_route->neigh1 == rose_neigh) {
791 rose_route->neigh1->use--;
792 rose_route->neigh1 = NULL;
793 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
794 }
795
796 if (rose_route->neigh2 == rose_neigh) {
797 rose_route->neigh2->use--;
798 rose_route->neigh2 = NULL;
799 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
800 }
801
802 rose_route = rose_route->next;
803 }
804 spin_unlock_bh(&rose_route_list_lock);
805}
806
807/*
808 * A level 2 link has timed out, therefore it appears to be a poor link,
809 * then don't use that neighbour until it is reset. Blow away all through
810 * routes and connections using this route.
811 */
812void rose_link_failed(ax25_cb *ax25, int reason)
813{
814 struct rose_neigh *rose_neigh;
815
816 spin_lock_bh(&rose_neigh_list_lock);
817 rose_neigh = rose_neigh_list;
818 while (rose_neigh != NULL) {
819 if (rose_neigh->ax25 == ax25)
820 break;
821 rose_neigh = rose_neigh->next;
822 }
823
824 if (rose_neigh != NULL) {
825 rose_neigh->ax25 = NULL;
826 ax25_cb_put(ax25);
827
828 rose_del_route_by_neigh(rose_neigh);
829 rose_kill_by_neigh(rose_neigh);
830 }
831 spin_unlock_bh(&rose_neigh_list_lock);
832}
833
834/*
835 * A device has been "downed" remove its link status. Blow away all
836 * through routes and connections that use this device.
837 */
838void rose_link_device_down(struct net_device *dev)
839{
840 struct rose_neigh *rose_neigh;
841
842 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
843 if (rose_neigh->dev == dev) {
844 rose_del_route_by_neigh(rose_neigh);
845 rose_kill_by_neigh(rose_neigh);
846 }
847 }
848}
849
850/*
851 * Route a frame to an appropriate AX.25 connection.
852 */
853int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
854{
855 struct rose_neigh *rose_neigh, *new_neigh;
856 struct rose_route *rose_route;
857 struct rose_facilities_struct facilities;
858 rose_address *src_addr, *dest_addr;
859 struct sock *sk;
860 unsigned short frametype;
861 unsigned int lci, new_lci;
862 unsigned char cause, diagnostic;
863 struct net_device *dev;
864 int res = 0;
865 char buf[11];
866
867 if (skb->len < ROSE_MIN_LEN)
868 return res;
869 frametype = skb->data[2];
870 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
871 if (frametype == ROSE_CALL_REQUEST &&
872 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
873 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
874 ROSE_CALL_REQ_ADDR_LEN_VAL))
875 return res;
876 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF);
877 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
878
879 spin_lock_bh(&rose_neigh_list_lock);
880 spin_lock_bh(&rose_route_list_lock);
881
882 rose_neigh = rose_neigh_list;
883 while (rose_neigh != NULL) {
884 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
885 ax25->ax25_dev->dev == rose_neigh->dev)
886 break;
887 rose_neigh = rose_neigh->next;
888 }
889
890 if (rose_neigh == NULL) {
891 printk("rose_route : unknown neighbour or device %s\n",
892 ax2asc(buf, &ax25->dest_addr));
893 goto out;
894 }
895
896 /*
897 * Obviously the link is working, halt the ftimer.
898 */
899 rose_stop_ftimer(rose_neigh);
900
901 /*
902 * LCI of zero is always for us, and its always a restart
903 * frame.
904 */
905 if (lci == 0) {
906 rose_link_rx_restart(skb, rose_neigh, frametype);
907 goto out;
908 }
909
910 /*
911 * Find an existing socket.
912 */
913 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
914 if (frametype == ROSE_CALL_REQUEST) {
915 struct rose_sock *rose = rose_sk(sk);
916
917 /* Remove an existing unused socket */
918 rose_clear_queues(sk);
919 rose->cause = ROSE_NETWORK_CONGESTION;
920 rose->diagnostic = 0;
921 rose->neighbour->use--;
922 rose->neighbour = NULL;
923 rose->lci = 0;
924 rose->state = ROSE_STATE_0;
925 sk->sk_state = TCP_CLOSE;
926 sk->sk_err = 0;
927 sk->sk_shutdown |= SEND_SHUTDOWN;
928 if (!sock_flag(sk, SOCK_DEAD)) {
929 sk->sk_state_change(sk);
930 sock_set_flag(sk, SOCK_DEAD);
931 }
932 }
933 else {
934 skb_reset_transport_header(skb);
935 res = rose_process_rx_frame(sk, skb);
936 goto out;
937 }
938 }
939
940 /*
941 * Is is a Call Request and is it for us ?
942 */
943 if (frametype == ROSE_CALL_REQUEST)
944 if ((dev = rose_dev_get(dest_addr)) != NULL) {
945 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
946 dev_put(dev);
947 goto out;
948 }
949
950 if (!sysctl_rose_routing_control) {
951 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
952 goto out;
953 }
954
955 /*
956 * Route it to the next in line if we have an entry for it.
957 */
958 rose_route = rose_route_list;
959 while (rose_route != NULL) {
960 if (rose_route->lci1 == lci &&
961 rose_route->neigh1 == rose_neigh) {
962 if (frametype == ROSE_CALL_REQUEST) {
963 /* F6FBB - Remove an existing unused route */
964 rose_remove_route(rose_route);
965 break;
966 } else if (rose_route->neigh2 != NULL) {
967 skb->data[0] &= 0xF0;
968 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
969 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
970 rose_transmit_link(skb, rose_route->neigh2);
971 if (frametype == ROSE_CLEAR_CONFIRMATION)
972 rose_remove_route(rose_route);
973 res = 1;
974 goto out;
975 } else {
976 if (frametype == ROSE_CLEAR_CONFIRMATION)
977 rose_remove_route(rose_route);
978 goto out;
979 }
980 }
981 if (rose_route->lci2 == lci &&
982 rose_route->neigh2 == rose_neigh) {
983 if (frametype == ROSE_CALL_REQUEST) {
984 /* F6FBB - Remove an existing unused route */
985 rose_remove_route(rose_route);
986 break;
987 } else if (rose_route->neigh1 != NULL) {
988 skb->data[0] &= 0xF0;
989 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
990 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
991 rose_transmit_link(skb, rose_route->neigh1);
992 if (frametype == ROSE_CLEAR_CONFIRMATION)
993 rose_remove_route(rose_route);
994 res = 1;
995 goto out;
996 } else {
997 if (frametype == ROSE_CLEAR_CONFIRMATION)
998 rose_remove_route(rose_route);
999 goto out;
1000 }
1001 }
1002 rose_route = rose_route->next;
1003 }
1004
1005 /*
1006 * We know that:
1007 * 1. The frame isn't for us,
1008 * 2. It isn't "owned" by any existing route.
1009 */
1010 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
1011 res = 0;
1012 goto out;
1013 }
1014
1015 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1016
1017 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF,
1018 skb->len - ROSE_CALL_REQ_FACILITIES_OFF,
1019 &facilities)) {
1020 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1021 goto out;
1022 }
1023
1024 /*
1025 * Check for routing loops.
1026 */
1027 rose_route = rose_route_list;
1028 while (rose_route != NULL) {
1029 if (rose_route->rand == facilities.rand &&
1030 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1031 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1032 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1033 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1034 goto out;
1035 }
1036 rose_route = rose_route->next;
1037 }
1038
1039 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) {
1040 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1041 goto out;
1042 }
1043
1044 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1045 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1046 goto out;
1047 }
1048
1049 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1050 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1051 goto out;
1052 }
1053
1054 rose_route->lci1 = lci;
1055 rose_route->src_addr = *src_addr;
1056 rose_route->dest_addr = *dest_addr;
1057 rose_route->src_call = facilities.dest_call;
1058 rose_route->dest_call = facilities.source_call;
1059 rose_route->rand = facilities.rand;
1060 rose_route->neigh1 = rose_neigh;
1061 rose_route->lci2 = new_lci;
1062 rose_route->neigh2 = new_neigh;
1063
1064 rose_route->neigh1->use++;
1065 rose_route->neigh2->use++;
1066
1067 rose_route->next = rose_route_list;
1068 rose_route_list = rose_route;
1069
1070 skb->data[0] &= 0xF0;
1071 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1072 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1073
1074 rose_transmit_link(skb, rose_route->neigh2);
1075 res = 1;
1076
1077out:
1078 spin_unlock_bh(&rose_route_list_lock);
1079 spin_unlock_bh(&rose_neigh_list_lock);
1080
1081 return res;
1082}
1083
1084#ifdef CONFIG_PROC_FS
1085
1086static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1087 __acquires(rose_node_list_lock)
1088{
1089 struct rose_node *rose_node;
1090 int i = 1;
1091
1092 spin_lock_bh(&rose_node_list_lock);
1093 if (*pos == 0)
1094 return SEQ_START_TOKEN;
1095
1096 for (rose_node = rose_node_list; rose_node && i < *pos;
1097 rose_node = rose_node->next, ++i);
1098
1099 return (i == *pos) ? rose_node : NULL;
1100}
1101
1102static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1103{
1104 ++*pos;
1105
1106 return (v == SEQ_START_TOKEN) ? rose_node_list
1107 : ((struct rose_node *)v)->next;
1108}
1109
1110static void rose_node_stop(struct seq_file *seq, void *v)
1111 __releases(rose_node_list_lock)
1112{
1113 spin_unlock_bh(&rose_node_list_lock);
1114}
1115
1116static int rose_node_show(struct seq_file *seq, void *v)
1117{
1118 char rsbuf[11];
1119 int i;
1120
1121 if (v == SEQ_START_TOKEN)
1122 seq_puts(seq, "address mask n neigh neigh neigh\n");
1123 else {
1124 const struct rose_node *rose_node = v;
1125 /* if (rose_node->loopback) {
1126 seq_printf(seq, "%-10s %04d 1 loopback\n",
1127 rose2asc(rsbuf, &rose_node->address),
1128 rose_node->mask);
1129 } else { */
1130 seq_printf(seq, "%-10s %04d %d",
1131 rose2asc(rsbuf, &rose_node->address),
1132 rose_node->mask,
1133 rose_node->count);
1134
1135 for (i = 0; i < rose_node->count; i++)
1136 seq_printf(seq, " %05d",
1137 rose_node->neighbour[i]->number);
1138
1139 seq_puts(seq, "\n");
1140 /* } */
1141 }
1142 return 0;
1143}
1144
1145static const struct seq_operations rose_node_seqops = {
1146 .start = rose_node_start,
1147 .next = rose_node_next,
1148 .stop = rose_node_stop,
1149 .show = rose_node_show,
1150};
1151
1152static int rose_nodes_open(struct inode *inode, struct file *file)
1153{
1154 return seq_open(file, &rose_node_seqops);
1155}
1156
1157const struct file_operations rose_nodes_fops = {
1158 .owner = THIS_MODULE,
1159 .open = rose_nodes_open,
1160 .read = seq_read,
1161 .llseek = seq_lseek,
1162 .release = seq_release,
1163};
1164
1165static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1166 __acquires(rose_neigh_list_lock)
1167{
1168 struct rose_neigh *rose_neigh;
1169 int i = 1;
1170
1171 spin_lock_bh(&rose_neigh_list_lock);
1172 if (*pos == 0)
1173 return SEQ_START_TOKEN;
1174
1175 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1176 rose_neigh = rose_neigh->next, ++i);
1177
1178 return (i == *pos) ? rose_neigh : NULL;
1179}
1180
1181static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1182{
1183 ++*pos;
1184
1185 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1186 : ((struct rose_neigh *)v)->next;
1187}
1188
1189static void rose_neigh_stop(struct seq_file *seq, void *v)
1190 __releases(rose_neigh_list_lock)
1191{
1192 spin_unlock_bh(&rose_neigh_list_lock);
1193}
1194
1195static int rose_neigh_show(struct seq_file *seq, void *v)
1196{
1197 char buf[11];
1198 int i;
1199
1200 if (v == SEQ_START_TOKEN)
1201 seq_puts(seq,
1202 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1203 else {
1204 struct rose_neigh *rose_neigh = v;
1205
1206 /* if (!rose_neigh->loopback) { */
1207 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1208 rose_neigh->number,
1209 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1210 rose_neigh->dev ? rose_neigh->dev->name : "???",
1211 rose_neigh->count,
1212 rose_neigh->use,
1213 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1214 (rose_neigh->restarted) ? "yes" : "no",
1215 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1216 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1217
1218 if (rose_neigh->digipeat != NULL) {
1219 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1220 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1221 }
1222
1223 seq_puts(seq, "\n");
1224 }
1225 return 0;
1226}
1227
1228
1229static const struct seq_operations rose_neigh_seqops = {
1230 .start = rose_neigh_start,
1231 .next = rose_neigh_next,
1232 .stop = rose_neigh_stop,
1233 .show = rose_neigh_show,
1234};
1235
1236static int rose_neigh_open(struct inode *inode, struct file *file)
1237{
1238 return seq_open(file, &rose_neigh_seqops);
1239}
1240
1241const struct file_operations rose_neigh_fops = {
1242 .owner = THIS_MODULE,
1243 .open = rose_neigh_open,
1244 .read = seq_read,
1245 .llseek = seq_lseek,
1246 .release = seq_release,
1247};
1248
1249
1250static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1251 __acquires(rose_route_list_lock)
1252{
1253 struct rose_route *rose_route;
1254 int i = 1;
1255
1256 spin_lock_bh(&rose_route_list_lock);
1257 if (*pos == 0)
1258 return SEQ_START_TOKEN;
1259
1260 for (rose_route = rose_route_list; rose_route && i < *pos;
1261 rose_route = rose_route->next, ++i);
1262
1263 return (i == *pos) ? rose_route : NULL;
1264}
1265
1266static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1267{
1268 ++*pos;
1269
1270 return (v == SEQ_START_TOKEN) ? rose_route_list
1271 : ((struct rose_route *)v)->next;
1272}
1273
1274static void rose_route_stop(struct seq_file *seq, void *v)
1275 __releases(rose_route_list_lock)
1276{
1277 spin_unlock_bh(&rose_route_list_lock);
1278}
1279
1280static int rose_route_show(struct seq_file *seq, void *v)
1281{
1282 char buf[11], rsbuf[11];
1283
1284 if (v == SEQ_START_TOKEN)
1285 seq_puts(seq,
1286 "lci address callsign neigh <-> lci address callsign neigh\n");
1287 else {
1288 struct rose_route *rose_route = v;
1289
1290 if (rose_route->neigh1)
1291 seq_printf(seq,
1292 "%3.3X %-10s %-9s %05d ",
1293 rose_route->lci1,
1294 rose2asc(rsbuf, &rose_route->src_addr),
1295 ax2asc(buf, &rose_route->src_call),
1296 rose_route->neigh1->number);
1297 else
1298 seq_puts(seq,
1299 "000 * * 00000 ");
1300
1301 if (rose_route->neigh2)
1302 seq_printf(seq,
1303 "%3.3X %-10s %-9s %05d\n",
1304 rose_route->lci2,
1305 rose2asc(rsbuf, &rose_route->dest_addr),
1306 ax2asc(buf, &rose_route->dest_call),
1307 rose_route->neigh2->number);
1308 else
1309 seq_puts(seq,
1310 "000 * * 00000\n");
1311 }
1312 return 0;
1313}
1314
1315static const struct seq_operations rose_route_seqops = {
1316 .start = rose_route_start,
1317 .next = rose_route_next,
1318 .stop = rose_route_stop,
1319 .show = rose_route_show,
1320};
1321
1322static int rose_route_open(struct inode *inode, struct file *file)
1323{
1324 return seq_open(file, &rose_route_seqops);
1325}
1326
1327const struct file_operations rose_routes_fops = {
1328 .owner = THIS_MODULE,
1329 .open = rose_route_open,
1330 .read = seq_read,
1331 .llseek = seq_lseek,
1332 .release = seq_release,
1333};
1334
1335#endif /* CONFIG_PROC_FS */
1336
1337/*
1338 * Release all memory associated with ROSE routing structures.
1339 */
1340void __exit rose_rt_free(void)
1341{
1342 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1343 struct rose_node *t, *rose_node = rose_node_list;
1344 struct rose_route *u, *rose_route = rose_route_list;
1345
1346 while (rose_neigh != NULL) {
1347 s = rose_neigh;
1348 rose_neigh = rose_neigh->next;
1349
1350 rose_remove_neigh(s);
1351 }
1352
1353 while (rose_node != NULL) {
1354 t = rose_node;
1355 rose_node = rose_node->next;
1356
1357 rose_remove_node(t);
1358 }
1359
1360 while (rose_route != NULL) {
1361 u = rose_route;
1362 rose_route = rose_route->next;
1363
1364 rose_remove_route(u);
1365 }
1366}
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 <linux/slab.h>
20#include <net/ax25.h>
21#include <linux/inet.h>
22#include <linux/netdevice.h>
23#include <net/arp.h>
24#include <linux/if_arp.h>
25#include <linux/skbuff.h>
26#include <net/sock.h>
27#include <net/tcp_states.h>
28#include <asm/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/init.h>
35#include <net/rose.h>
36#include <linux/seq_file.h>
37#include <linux/export.h>
38
39static unsigned int rose_neigh_no = 1;
40
41static struct rose_node *rose_node_list;
42static DEFINE_SPINLOCK(rose_node_list_lock);
43static struct rose_neigh *rose_neigh_list;
44static DEFINE_SPINLOCK(rose_neigh_list_lock);
45static struct rose_route *rose_route_list;
46static DEFINE_SPINLOCK(rose_route_list_lock);
47
48struct 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 */
54static 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,
81 &rose_neigh->callsign) == 0 &&
82 rose_neigh->dev == dev)
83 break;
84 rose_neigh = rose_neigh->next;
85 }
86
87 if (rose_neigh == NULL) {
88 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
89 if (rose_neigh == NULL) {
90 res = -ENOMEM;
91 goto out;
92 }
93
94 rose_neigh->callsign = rose_route->neighbour;
95 rose_neigh->digipeat = NULL;
96 rose_neigh->ax25 = NULL;
97 rose_neigh->dev = dev;
98 rose_neigh->count = 0;
99 rose_neigh->use = 0;
100 rose_neigh->dce_mode = 0;
101 rose_neigh->loopback = 0;
102 rose_neigh->number = rose_neigh_no++;
103 rose_neigh->restarted = 0;
104
105 skb_queue_head_init(&rose_neigh->queue);
106
107 init_timer(&rose_neigh->ftimer);
108 init_timer(&rose_neigh->t0timer);
109
110 if (rose_route->ndigis != 0) {
111 rose_neigh->digipeat =
112 kmalloc(sizeof(ax25_digi), GFP_ATOMIC);
113 if (rose_neigh->digipeat == NULL) {
114 kfree(rose_neigh);
115 res = -ENOMEM;
116 goto out;
117 }
118
119 rose_neigh->digipeat->ndigi = rose_route->ndigis;
120 rose_neigh->digipeat->lastrepeat = -1;
121
122 for (i = 0; i < rose_route->ndigis; i++) {
123 rose_neigh->digipeat->calls[i] =
124 rose_route->digipeaters[i];
125 rose_neigh->digipeat->repeated[i] = 0;
126 }
127 }
128
129 rose_neigh->next = rose_neigh_list;
130 rose_neigh_list = rose_neigh;
131 }
132
133 /*
134 * This is a new node to be inserted into the list. Find where it needs
135 * to be inserted into the list, and insert it. We want to be sure
136 * to order the list in descending order of mask size to ensure that
137 * later when we are searching this list the first match will be the
138 * best match.
139 */
140 if (rose_node == NULL) {
141 rose_tmpn = rose_node_list;
142 rose_tmpp = NULL;
143
144 while (rose_tmpn != NULL) {
145 if (rose_tmpn->mask > rose_route->mask) {
146 rose_tmpp = rose_tmpn;
147 rose_tmpn = rose_tmpn->next;
148 } else {
149 break;
150 }
151 }
152
153 /* create new node */
154 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
155 if (rose_node == NULL) {
156 res = -ENOMEM;
157 goto out;
158 }
159
160 rose_node->address = rose_route->address;
161 rose_node->mask = rose_route->mask;
162 rose_node->count = 1;
163 rose_node->loopback = 0;
164 rose_node->neighbour[0] = rose_neigh;
165
166 if (rose_tmpn == NULL) {
167 if (rose_tmpp == NULL) { /* Empty list */
168 rose_node_list = rose_node;
169 rose_node->next = NULL;
170 } else {
171 rose_tmpp->next = rose_node;
172 rose_node->next = NULL;
173 }
174 } else {
175 if (rose_tmpp == NULL) { /* 1st node */
176 rose_node->next = rose_node_list;
177 rose_node_list = rose_node;
178 } else {
179 rose_tmpp->next = rose_node;
180 rose_node->next = rose_tmpn;
181 }
182 }
183 rose_neigh->count++;
184
185 goto out;
186 }
187
188 /* We have space, slot it in */
189 if (rose_node->count < 3) {
190 rose_node->neighbour[rose_node->count] = rose_neigh;
191 rose_node->count++;
192 rose_neigh->count++;
193 }
194
195out:
196 spin_unlock_bh(&rose_neigh_list_lock);
197 spin_unlock_bh(&rose_node_list_lock);
198
199 return res;
200}
201
202/*
203 * Caller is holding rose_node_list_lock.
204 */
205static void rose_remove_node(struct rose_node *rose_node)
206{
207 struct rose_node *s;
208
209 if ((s = rose_node_list) == rose_node) {
210 rose_node_list = rose_node->next;
211 kfree(rose_node);
212 return;
213 }
214
215 while (s != NULL && s->next != NULL) {
216 if (s->next == rose_node) {
217 s->next = rose_node->next;
218 kfree(rose_node);
219 return;
220 }
221
222 s = s->next;
223 }
224}
225
226/*
227 * Caller is holding rose_neigh_list_lock.
228 */
229static void rose_remove_neigh(struct rose_neigh *rose_neigh)
230{
231 struct rose_neigh *s;
232
233 rose_stop_ftimer(rose_neigh);
234 rose_stop_t0timer(rose_neigh);
235
236 skb_queue_purge(&rose_neigh->queue);
237
238 if ((s = rose_neigh_list) == rose_neigh) {
239 rose_neigh_list = rose_neigh->next;
240 if (rose_neigh->ax25)
241 ax25_cb_put(rose_neigh->ax25);
242 kfree(rose_neigh->digipeat);
243 kfree(rose_neigh);
244 return;
245 }
246
247 while (s != NULL && s->next != NULL) {
248 if (s->next == rose_neigh) {
249 s->next = rose_neigh->next;
250 if (rose_neigh->ax25)
251 ax25_cb_put(rose_neigh->ax25);
252 kfree(rose_neigh->digipeat);
253 kfree(rose_neigh);
254 return;
255 }
256
257 s = s->next;
258 }
259}
260
261/*
262 * Caller is holding rose_route_list_lock.
263 */
264static void rose_remove_route(struct rose_route *rose_route)
265{
266 struct rose_route *s;
267
268 if (rose_route->neigh1 != NULL)
269 rose_route->neigh1->use--;
270
271 if (rose_route->neigh2 != NULL)
272 rose_route->neigh2->use--;
273
274 if ((s = rose_route_list) == rose_route) {
275 rose_route_list = rose_route->next;
276 kfree(rose_route);
277 return;
278 }
279
280 while (s != NULL && s->next != NULL) {
281 if (s->next == rose_route) {
282 s->next = rose_route->next;
283 kfree(rose_route);
284 return;
285 }
286
287 s = s->next;
288 }
289}
290
291/*
292 * "Delete" a node. Strictly speaking remove a route to a node. The node
293 * is only deleted if no routes are left to it.
294 */
295static int rose_del_node(struct rose_route_struct *rose_route,
296 struct net_device *dev)
297{
298 struct rose_node *rose_node;
299 struct rose_neigh *rose_neigh;
300 int i, err = 0;
301
302 spin_lock_bh(&rose_node_list_lock);
303 spin_lock_bh(&rose_neigh_list_lock);
304
305 rose_node = rose_node_list;
306 while (rose_node != NULL) {
307 if ((rose_node->mask == rose_route->mask) &&
308 (rosecmpm(&rose_route->address, &rose_node->address,
309 rose_route->mask) == 0))
310 break;
311 rose_node = rose_node->next;
312 }
313
314 if (rose_node == NULL || rose_node->loopback) {
315 err = -EINVAL;
316 goto out;
317 }
318
319 rose_neigh = rose_neigh_list;
320 while (rose_neigh != NULL) {
321 if (ax25cmp(&rose_route->neighbour,
322 &rose_neigh->callsign) == 0 &&
323 rose_neigh->dev == dev)
324 break;
325 rose_neigh = rose_neigh->next;
326 }
327
328 if (rose_neigh == NULL) {
329 err = -EINVAL;
330 goto out;
331 }
332
333 for (i = 0; i < rose_node->count; i++) {
334 if (rose_node->neighbour[i] == rose_neigh) {
335 rose_neigh->count--;
336
337 if (rose_neigh->count == 0 && rose_neigh->use == 0)
338 rose_remove_neigh(rose_neigh);
339
340 rose_node->count--;
341
342 if (rose_node->count == 0) {
343 rose_remove_node(rose_node);
344 } else {
345 switch (i) {
346 case 0:
347 rose_node->neighbour[0] =
348 rose_node->neighbour[1];
349 case 1:
350 rose_node->neighbour[1] =
351 rose_node->neighbour[2];
352 case 2:
353 break;
354 }
355 }
356 goto out;
357 }
358 }
359 err = -EINVAL;
360
361out:
362 spin_unlock_bh(&rose_neigh_list_lock);
363 spin_unlock_bh(&rose_node_list_lock);
364
365 return err;
366}
367
368/*
369 * Add the loopback neighbour.
370 */
371void rose_add_loopback_neigh(void)
372{
373 struct rose_neigh *sn;
374
375 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL);
376 if (!rose_loopback_neigh)
377 return;
378 sn = rose_loopback_neigh;
379
380 sn->callsign = null_ax25_address;
381 sn->digipeat = NULL;
382 sn->ax25 = NULL;
383 sn->dev = NULL;
384 sn->count = 0;
385 sn->use = 0;
386 sn->dce_mode = 1;
387 sn->loopback = 1;
388 sn->number = rose_neigh_no++;
389 sn->restarted = 1;
390
391 skb_queue_head_init(&sn->queue);
392
393 init_timer(&sn->ftimer);
394 init_timer(&sn->t0timer);
395
396 spin_lock_bh(&rose_neigh_list_lock);
397 sn->next = rose_neigh_list;
398 rose_neigh_list = sn;
399 spin_unlock_bh(&rose_neigh_list_lock);
400}
401
402/*
403 * Add a loopback node.
404 */
405int rose_add_loopback_node(rose_address *address)
406{
407 struct rose_node *rose_node;
408 int err = 0;
409
410 spin_lock_bh(&rose_node_list_lock);
411
412 rose_node = rose_node_list;
413 while (rose_node != NULL) {
414 if ((rose_node->mask == 10) &&
415 (rosecmpm(address, &rose_node->address, 10) == 0) &&
416 rose_node->loopback)
417 break;
418 rose_node = rose_node->next;
419 }
420
421 if (rose_node != NULL)
422 goto out;
423
424 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
425 err = -ENOMEM;
426 goto out;
427 }
428
429 rose_node->address = *address;
430 rose_node->mask = 10;
431 rose_node->count = 1;
432 rose_node->loopback = 1;
433 rose_node->neighbour[0] = rose_loopback_neigh;
434
435 /* Insert at the head of list. Address is always mask=10 */
436 rose_node->next = rose_node_list;
437 rose_node_list = rose_node;
438
439 rose_loopback_neigh->count++;
440
441out:
442 spin_unlock_bh(&rose_node_list_lock);
443
444 return err;
445}
446
447/*
448 * Delete a loopback node.
449 */
450void rose_del_loopback_node(rose_address *address)
451{
452 struct rose_node *rose_node;
453
454 spin_lock_bh(&rose_node_list_lock);
455
456 rose_node = rose_node_list;
457 while (rose_node != NULL) {
458 if ((rose_node->mask == 10) &&
459 (rosecmpm(address, &rose_node->address, 10) == 0) &&
460 rose_node->loopback)
461 break;
462 rose_node = rose_node->next;
463 }
464
465 if (rose_node == NULL)
466 goto out;
467
468 rose_remove_node(rose_node);
469
470 rose_loopback_neigh->count--;
471
472out:
473 spin_unlock_bh(&rose_node_list_lock);
474}
475
476/*
477 * A device has been removed. Remove its routes and neighbours.
478 */
479void rose_rt_device_down(struct net_device *dev)
480{
481 struct rose_neigh *s, *rose_neigh;
482 struct rose_node *t, *rose_node;
483 int i;
484
485 spin_lock_bh(&rose_node_list_lock);
486 spin_lock_bh(&rose_neigh_list_lock);
487 rose_neigh = rose_neigh_list;
488 while (rose_neigh != NULL) {
489 s = rose_neigh;
490 rose_neigh = rose_neigh->next;
491
492 if (s->dev != dev)
493 continue;
494
495 rose_node = rose_node_list;
496
497 while (rose_node != NULL) {
498 t = rose_node;
499 rose_node = rose_node->next;
500
501 for (i = 0; i < t->count; i++) {
502 if (t->neighbour[i] != s)
503 continue;
504
505 t->count--;
506
507 switch (i) {
508 case 0:
509 t->neighbour[0] = t->neighbour[1];
510 case 1:
511 t->neighbour[1] = t->neighbour[2];
512 case 2:
513 break;
514 }
515 }
516
517 if (t->count <= 0)
518 rose_remove_node(t);
519 }
520
521 rose_remove_neigh(s);
522 }
523 spin_unlock_bh(&rose_neigh_list_lock);
524 spin_unlock_bh(&rose_node_list_lock);
525}
526
527#if 0 /* Currently unused */
528/*
529 * A device has been removed. Remove its links.
530 */
531void rose_route_device_down(struct net_device *dev)
532{
533 struct rose_route *s, *rose_route;
534
535 spin_lock_bh(&rose_route_list_lock);
536 rose_route = rose_route_list;
537 while (rose_route != NULL) {
538 s = rose_route;
539 rose_route = rose_route->next;
540
541 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
542 rose_remove_route(s);
543 }
544 spin_unlock_bh(&rose_route_list_lock);
545}
546#endif
547
548/*
549 * Clear all nodes and neighbours out, except for neighbours with
550 * active connections going through them.
551 * Do not clear loopback neighbour and nodes.
552 */
553static int rose_clear_routes(void)
554{
555 struct rose_neigh *s, *rose_neigh;
556 struct rose_node *t, *rose_node;
557
558 spin_lock_bh(&rose_node_list_lock);
559 spin_lock_bh(&rose_neigh_list_lock);
560
561 rose_neigh = rose_neigh_list;
562 rose_node = rose_node_list;
563
564 while (rose_node != NULL) {
565 t = rose_node;
566 rose_node = rose_node->next;
567 if (!t->loopback)
568 rose_remove_node(t);
569 }
570
571 while (rose_neigh != NULL) {
572 s = rose_neigh;
573 rose_neigh = rose_neigh->next;
574
575 if (s->use == 0 && !s->loopback) {
576 s->count = 0;
577 rose_remove_neigh(s);
578 }
579 }
580
581 spin_unlock_bh(&rose_neigh_list_lock);
582 spin_unlock_bh(&rose_node_list_lock);
583
584 return 0;
585}
586
587/*
588 * Check that the device given is a valid AX.25 interface that is "up".
589 * called with RTNL
590 */
591static struct net_device *rose_ax25_dev_find(char *devname)
592{
593 struct net_device *dev;
594
595 if ((dev = __dev_get_by_name(&init_net, devname)) == NULL)
596 return NULL;
597
598 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
599 return dev;
600
601 return NULL;
602}
603
604/*
605 * Find the first active ROSE device, usually "rose0".
606 */
607struct net_device *rose_dev_first(void)
608{
609 struct net_device *dev, *first = NULL;
610
611 rcu_read_lock();
612 for_each_netdev_rcu(&init_net, dev) {
613 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
614 if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
615 first = dev;
616 }
617 rcu_read_unlock();
618
619 return first;
620}
621
622/*
623 * Find the ROSE device for the given address.
624 */
625struct net_device *rose_dev_get(rose_address *addr)
626{
627 struct net_device *dev;
628
629 rcu_read_lock();
630 for_each_netdev_rcu(&init_net, dev) {
631 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
632 dev_hold(dev);
633 goto out;
634 }
635 }
636 dev = NULL;
637out:
638 rcu_read_unlock();
639 return dev;
640}
641
642static int rose_dev_exists(rose_address *addr)
643{
644 struct net_device *dev;
645
646 rcu_read_lock();
647 for_each_netdev_rcu(&init_net, dev) {
648 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
649 goto out;
650 }
651 dev = NULL;
652out:
653 rcu_read_unlock();
654 return dev != NULL;
655}
656
657
658
659
660struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
661{
662 struct rose_route *rose_route;
663
664 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
665 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
666 (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
667 return rose_route;
668
669 return NULL;
670}
671
672/*
673 * Find a neighbour or a route given a ROSE address.
674 */
675struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
676 unsigned char *diagnostic, int route_frame)
677{
678 struct rose_neigh *res = NULL;
679 struct rose_node *node;
680 int failed = 0;
681 int i;
682
683 if (!route_frame) spin_lock_bh(&rose_node_list_lock);
684 for (node = rose_node_list; node != NULL; node = node->next) {
685 if (rosecmpm(addr, &node->address, node->mask) == 0) {
686 for (i = 0; i < node->count; i++) {
687 if (node->neighbour[i]->restarted) {
688 res = node->neighbour[i];
689 goto out;
690 }
691 }
692 }
693 }
694 if (!route_frame) { /* connect request */
695 for (node = rose_node_list; node != NULL; node = node->next) {
696 if (rosecmpm(addr, &node->address, node->mask) == 0) {
697 for (i = 0; i < node->count; i++) {
698 if (!rose_ftimer_running(node->neighbour[i])) {
699 res = node->neighbour[i];
700 failed = 0;
701 goto out;
702 }
703 failed = 1;
704 }
705 }
706 }
707 }
708
709 if (failed) {
710 *cause = ROSE_OUT_OF_ORDER;
711 *diagnostic = 0;
712 } else {
713 *cause = ROSE_NOT_OBTAINABLE;
714 *diagnostic = 0;
715 }
716
717out:
718 if (!route_frame) spin_unlock_bh(&rose_node_list_lock);
719 return res;
720}
721
722/*
723 * Handle the ioctls that control the routing functions.
724 */
725int rose_rt_ioctl(unsigned int cmd, void __user *arg)
726{
727 struct rose_route_struct rose_route;
728 struct net_device *dev;
729 int err;
730
731 switch (cmd) {
732 case SIOCADDRT:
733 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
734 return -EFAULT;
735 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
736 return -EINVAL;
737 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */
738 return -EINVAL;
739 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
740 return -EINVAL;
741 if (rose_route.ndigis > AX25_MAX_DIGIS)
742 return -EINVAL;
743 err = rose_add_node(&rose_route, dev);
744 return err;
745
746 case SIOCDELRT:
747 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
748 return -EFAULT;
749 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
750 return -EINVAL;
751 err = rose_del_node(&rose_route, dev);
752 return err;
753
754 case SIOCRSCLRRT:
755 return rose_clear_routes();
756
757 default:
758 return -EINVAL;
759 }
760
761 return 0;
762}
763
764static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
765{
766 struct rose_route *rose_route, *s;
767
768 rose_neigh->restarted = 0;
769
770 rose_stop_t0timer(rose_neigh);
771 rose_start_ftimer(rose_neigh);
772
773 skb_queue_purge(&rose_neigh->queue);
774
775 spin_lock_bh(&rose_route_list_lock);
776
777 rose_route = rose_route_list;
778
779 while (rose_route != NULL) {
780 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
781 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) ||
782 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
783 s = rose_route->next;
784 rose_remove_route(rose_route);
785 rose_route = s;
786 continue;
787 }
788
789 if (rose_route->neigh1 == rose_neigh) {
790 rose_route->neigh1->use--;
791 rose_route->neigh1 = NULL;
792 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
793 }
794
795 if (rose_route->neigh2 == rose_neigh) {
796 rose_route->neigh2->use--;
797 rose_route->neigh2 = NULL;
798 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
799 }
800
801 rose_route = rose_route->next;
802 }
803 spin_unlock_bh(&rose_route_list_lock);
804}
805
806/*
807 * A level 2 link has timed out, therefore it appears to be a poor link,
808 * then don't use that neighbour until it is reset. Blow away all through
809 * routes and connections using this route.
810 */
811void rose_link_failed(ax25_cb *ax25, int reason)
812{
813 struct rose_neigh *rose_neigh;
814
815 spin_lock_bh(&rose_neigh_list_lock);
816 rose_neigh = rose_neigh_list;
817 while (rose_neigh != NULL) {
818 if (rose_neigh->ax25 == ax25)
819 break;
820 rose_neigh = rose_neigh->next;
821 }
822
823 if (rose_neigh != NULL) {
824 rose_neigh->ax25 = NULL;
825 ax25_cb_put(ax25);
826
827 rose_del_route_by_neigh(rose_neigh);
828 rose_kill_by_neigh(rose_neigh);
829 }
830 spin_unlock_bh(&rose_neigh_list_lock);
831}
832
833/*
834 * A device has been "downed" remove its link status. Blow away all
835 * through routes and connections that use this device.
836 */
837void rose_link_device_down(struct net_device *dev)
838{
839 struct rose_neigh *rose_neigh;
840
841 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
842 if (rose_neigh->dev == dev) {
843 rose_del_route_by_neigh(rose_neigh);
844 rose_kill_by_neigh(rose_neigh);
845 }
846 }
847}
848
849/*
850 * Route a frame to an appropriate AX.25 connection.
851 */
852int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
853{
854 struct rose_neigh *rose_neigh, *new_neigh;
855 struct rose_route *rose_route;
856 struct rose_facilities_struct facilities;
857 rose_address *src_addr, *dest_addr;
858 struct sock *sk;
859 unsigned short frametype;
860 unsigned int lci, new_lci;
861 unsigned char cause, diagnostic;
862 struct net_device *dev;
863 int res = 0;
864 char buf[11];
865
866 if (skb->len < ROSE_MIN_LEN)
867 return res;
868 frametype = skb->data[2];
869 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
870 if (frametype == ROSE_CALL_REQUEST &&
871 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
872 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
873 ROSE_CALL_REQ_ADDR_LEN_VAL))
874 return res;
875 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF);
876 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
877
878 spin_lock_bh(&rose_neigh_list_lock);
879 spin_lock_bh(&rose_route_list_lock);
880
881 rose_neigh = rose_neigh_list;
882 while (rose_neigh != NULL) {
883 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
884 ax25->ax25_dev->dev == rose_neigh->dev)
885 break;
886 rose_neigh = rose_neigh->next;
887 }
888
889 if (rose_neigh == NULL) {
890 printk("rose_route : unknown neighbour or device %s\n",
891 ax2asc(buf, &ax25->dest_addr));
892 goto out;
893 }
894
895 /*
896 * Obviously the link is working, halt the ftimer.
897 */
898 rose_stop_ftimer(rose_neigh);
899
900 /*
901 * LCI of zero is always for us, and its always a restart
902 * frame.
903 */
904 if (lci == 0) {
905 rose_link_rx_restart(skb, rose_neigh, frametype);
906 goto out;
907 }
908
909 /*
910 * Find an existing socket.
911 */
912 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
913 if (frametype == ROSE_CALL_REQUEST) {
914 struct rose_sock *rose = rose_sk(sk);
915
916 /* Remove an existing unused socket */
917 rose_clear_queues(sk);
918 rose->cause = ROSE_NETWORK_CONGESTION;
919 rose->diagnostic = 0;
920 rose->neighbour->use--;
921 rose->neighbour = NULL;
922 rose->lci = 0;
923 rose->state = ROSE_STATE_0;
924 sk->sk_state = TCP_CLOSE;
925 sk->sk_err = 0;
926 sk->sk_shutdown |= SEND_SHUTDOWN;
927 if (!sock_flag(sk, SOCK_DEAD)) {
928 sk->sk_state_change(sk);
929 sock_set_flag(sk, SOCK_DEAD);
930 }
931 }
932 else {
933 skb_reset_transport_header(skb);
934 res = rose_process_rx_frame(sk, skb);
935 goto out;
936 }
937 }
938
939 /*
940 * Is is a Call Request and is it for us ?
941 */
942 if (frametype == ROSE_CALL_REQUEST)
943 if ((dev = rose_dev_get(dest_addr)) != NULL) {
944 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
945 dev_put(dev);
946 goto out;
947 }
948
949 if (!sysctl_rose_routing_control) {
950 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
951 goto out;
952 }
953
954 /*
955 * Route it to the next in line if we have an entry for it.
956 */
957 rose_route = rose_route_list;
958 while (rose_route != NULL) {
959 if (rose_route->lci1 == lci &&
960 rose_route->neigh1 == rose_neigh) {
961 if (frametype == ROSE_CALL_REQUEST) {
962 /* F6FBB - Remove an existing unused route */
963 rose_remove_route(rose_route);
964 break;
965 } else if (rose_route->neigh2 != NULL) {
966 skb->data[0] &= 0xF0;
967 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
968 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
969 rose_transmit_link(skb, rose_route->neigh2);
970 if (frametype == ROSE_CLEAR_CONFIRMATION)
971 rose_remove_route(rose_route);
972 res = 1;
973 goto out;
974 } else {
975 if (frametype == ROSE_CLEAR_CONFIRMATION)
976 rose_remove_route(rose_route);
977 goto out;
978 }
979 }
980 if (rose_route->lci2 == lci &&
981 rose_route->neigh2 == rose_neigh) {
982 if (frametype == ROSE_CALL_REQUEST) {
983 /* F6FBB - Remove an existing unused route */
984 rose_remove_route(rose_route);
985 break;
986 } else if (rose_route->neigh1 != NULL) {
987 skb->data[0] &= 0xF0;
988 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
989 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
990 rose_transmit_link(skb, rose_route->neigh1);
991 if (frametype == ROSE_CLEAR_CONFIRMATION)
992 rose_remove_route(rose_route);
993 res = 1;
994 goto out;
995 } else {
996 if (frametype == ROSE_CLEAR_CONFIRMATION)
997 rose_remove_route(rose_route);
998 goto out;
999 }
1000 }
1001 rose_route = rose_route->next;
1002 }
1003
1004 /*
1005 * We know that:
1006 * 1. The frame isn't for us,
1007 * 2. It isn't "owned" by any existing route.
1008 */
1009 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
1010 res = 0;
1011 goto out;
1012 }
1013
1014 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1015
1016 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF,
1017 skb->len - ROSE_CALL_REQ_FACILITIES_OFF,
1018 &facilities)) {
1019 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1020 goto out;
1021 }
1022
1023 /*
1024 * Check for routing loops.
1025 */
1026 rose_route = rose_route_list;
1027 while (rose_route != NULL) {
1028 if (rose_route->rand == facilities.rand &&
1029 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1030 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1031 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1032 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1033 goto out;
1034 }
1035 rose_route = rose_route->next;
1036 }
1037
1038 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) {
1039 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1040 goto out;
1041 }
1042
1043 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1044 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1045 goto out;
1046 }
1047
1048 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1049 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1050 goto out;
1051 }
1052
1053 rose_route->lci1 = lci;
1054 rose_route->src_addr = *src_addr;
1055 rose_route->dest_addr = *dest_addr;
1056 rose_route->src_call = facilities.dest_call;
1057 rose_route->dest_call = facilities.source_call;
1058 rose_route->rand = facilities.rand;
1059 rose_route->neigh1 = rose_neigh;
1060 rose_route->lci2 = new_lci;
1061 rose_route->neigh2 = new_neigh;
1062
1063 rose_route->neigh1->use++;
1064 rose_route->neigh2->use++;
1065
1066 rose_route->next = rose_route_list;
1067 rose_route_list = rose_route;
1068
1069 skb->data[0] &= 0xF0;
1070 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1071 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1072
1073 rose_transmit_link(skb, rose_route->neigh2);
1074 res = 1;
1075
1076out:
1077 spin_unlock_bh(&rose_route_list_lock);
1078 spin_unlock_bh(&rose_neigh_list_lock);
1079
1080 return res;
1081}
1082
1083#ifdef CONFIG_PROC_FS
1084
1085static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1086 __acquires(rose_node_list_lock)
1087{
1088 struct rose_node *rose_node;
1089 int i = 1;
1090
1091 spin_lock_bh(&rose_node_list_lock);
1092 if (*pos == 0)
1093 return SEQ_START_TOKEN;
1094
1095 for (rose_node = rose_node_list; rose_node && i < *pos;
1096 rose_node = rose_node->next, ++i);
1097
1098 return (i == *pos) ? rose_node : NULL;
1099}
1100
1101static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1102{
1103 ++*pos;
1104
1105 return (v == SEQ_START_TOKEN) ? rose_node_list
1106 : ((struct rose_node *)v)->next;
1107}
1108
1109static void rose_node_stop(struct seq_file *seq, void *v)
1110 __releases(rose_node_list_lock)
1111{
1112 spin_unlock_bh(&rose_node_list_lock);
1113}
1114
1115static int rose_node_show(struct seq_file *seq, void *v)
1116{
1117 char rsbuf[11];
1118 int i;
1119
1120 if (v == SEQ_START_TOKEN)
1121 seq_puts(seq, "address mask n neigh neigh neigh\n");
1122 else {
1123 const struct rose_node *rose_node = v;
1124 /* if (rose_node->loopback) {
1125 seq_printf(seq, "%-10s %04d 1 loopback\n",
1126 rose2asc(rsbuf, &rose_node->address),
1127 rose_node->mask);
1128 } else { */
1129 seq_printf(seq, "%-10s %04d %d",
1130 rose2asc(rsbuf, &rose_node->address),
1131 rose_node->mask,
1132 rose_node->count);
1133
1134 for (i = 0; i < rose_node->count; i++)
1135 seq_printf(seq, " %05d",
1136 rose_node->neighbour[i]->number);
1137
1138 seq_puts(seq, "\n");
1139 /* } */
1140 }
1141 return 0;
1142}
1143
1144static const struct seq_operations rose_node_seqops = {
1145 .start = rose_node_start,
1146 .next = rose_node_next,
1147 .stop = rose_node_stop,
1148 .show = rose_node_show,
1149};
1150
1151static int rose_nodes_open(struct inode *inode, struct file *file)
1152{
1153 return seq_open(file, &rose_node_seqops);
1154}
1155
1156const struct file_operations rose_nodes_fops = {
1157 .owner = THIS_MODULE,
1158 .open = rose_nodes_open,
1159 .read = seq_read,
1160 .llseek = seq_lseek,
1161 .release = seq_release,
1162};
1163
1164static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1165 __acquires(rose_neigh_list_lock)
1166{
1167 struct rose_neigh *rose_neigh;
1168 int i = 1;
1169
1170 spin_lock_bh(&rose_neigh_list_lock);
1171 if (*pos == 0)
1172 return SEQ_START_TOKEN;
1173
1174 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1175 rose_neigh = rose_neigh->next, ++i);
1176
1177 return (i == *pos) ? rose_neigh : NULL;
1178}
1179
1180static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1181{
1182 ++*pos;
1183
1184 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1185 : ((struct rose_neigh *)v)->next;
1186}
1187
1188static void rose_neigh_stop(struct seq_file *seq, void *v)
1189 __releases(rose_neigh_list_lock)
1190{
1191 spin_unlock_bh(&rose_neigh_list_lock);
1192}
1193
1194static int rose_neigh_show(struct seq_file *seq, void *v)
1195{
1196 char buf[11];
1197 int i;
1198
1199 if (v == SEQ_START_TOKEN)
1200 seq_puts(seq,
1201 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1202 else {
1203 struct rose_neigh *rose_neigh = v;
1204
1205 /* if (!rose_neigh->loopback) { */
1206 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1207 rose_neigh->number,
1208 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1209 rose_neigh->dev ? rose_neigh->dev->name : "???",
1210 rose_neigh->count,
1211 rose_neigh->use,
1212 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1213 (rose_neigh->restarted) ? "yes" : "no",
1214 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1215 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1216
1217 if (rose_neigh->digipeat != NULL) {
1218 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1219 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1220 }
1221
1222 seq_puts(seq, "\n");
1223 }
1224 return 0;
1225}
1226
1227
1228static const struct seq_operations rose_neigh_seqops = {
1229 .start = rose_neigh_start,
1230 .next = rose_neigh_next,
1231 .stop = rose_neigh_stop,
1232 .show = rose_neigh_show,
1233};
1234
1235static int rose_neigh_open(struct inode *inode, struct file *file)
1236{
1237 return seq_open(file, &rose_neigh_seqops);
1238}
1239
1240const struct file_operations rose_neigh_fops = {
1241 .owner = THIS_MODULE,
1242 .open = rose_neigh_open,
1243 .read = seq_read,
1244 .llseek = seq_lseek,
1245 .release = seq_release,
1246};
1247
1248
1249static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1250 __acquires(rose_route_list_lock)
1251{
1252 struct rose_route *rose_route;
1253 int i = 1;
1254
1255 spin_lock_bh(&rose_route_list_lock);
1256 if (*pos == 0)
1257 return SEQ_START_TOKEN;
1258
1259 for (rose_route = rose_route_list; rose_route && i < *pos;
1260 rose_route = rose_route->next, ++i);
1261
1262 return (i == *pos) ? rose_route : NULL;
1263}
1264
1265static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1266{
1267 ++*pos;
1268
1269 return (v == SEQ_START_TOKEN) ? rose_route_list
1270 : ((struct rose_route *)v)->next;
1271}
1272
1273static void rose_route_stop(struct seq_file *seq, void *v)
1274 __releases(rose_route_list_lock)
1275{
1276 spin_unlock_bh(&rose_route_list_lock);
1277}
1278
1279static int rose_route_show(struct seq_file *seq, void *v)
1280{
1281 char buf[11], rsbuf[11];
1282
1283 if (v == SEQ_START_TOKEN)
1284 seq_puts(seq,
1285 "lci address callsign neigh <-> lci address callsign neigh\n");
1286 else {
1287 struct rose_route *rose_route = v;
1288
1289 if (rose_route->neigh1)
1290 seq_printf(seq,
1291 "%3.3X %-10s %-9s %05d ",
1292 rose_route->lci1,
1293 rose2asc(rsbuf, &rose_route->src_addr),
1294 ax2asc(buf, &rose_route->src_call),
1295 rose_route->neigh1->number);
1296 else
1297 seq_puts(seq,
1298 "000 * * 00000 ");
1299
1300 if (rose_route->neigh2)
1301 seq_printf(seq,
1302 "%3.3X %-10s %-9s %05d\n",
1303 rose_route->lci2,
1304 rose2asc(rsbuf, &rose_route->dest_addr),
1305 ax2asc(buf, &rose_route->dest_call),
1306 rose_route->neigh2->number);
1307 else
1308 seq_puts(seq,
1309 "000 * * 00000\n");
1310 }
1311 return 0;
1312}
1313
1314static const struct seq_operations rose_route_seqops = {
1315 .start = rose_route_start,
1316 .next = rose_route_next,
1317 .stop = rose_route_stop,
1318 .show = rose_route_show,
1319};
1320
1321static int rose_route_open(struct inode *inode, struct file *file)
1322{
1323 return seq_open(file, &rose_route_seqops);
1324}
1325
1326const struct file_operations rose_routes_fops = {
1327 .owner = THIS_MODULE,
1328 .open = rose_route_open,
1329 .read = seq_read,
1330 .llseek = seq_lseek,
1331 .release = seq_release,
1332};
1333
1334#endif /* CONFIG_PROC_FS */
1335
1336/*
1337 * Release all memory associated with ROSE routing structures.
1338 */
1339void __exit rose_rt_free(void)
1340{
1341 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1342 struct rose_node *t, *rose_node = rose_node_list;
1343 struct rose_route *u, *rose_route = rose_route_list;
1344
1345 while (rose_neigh != NULL) {
1346 s = rose_neigh;
1347 rose_neigh = rose_neigh->next;
1348
1349 rose_remove_neigh(s);
1350 }
1351
1352 while (rose_node != NULL) {
1353 t = rose_node;
1354 rose_node = rose_node->next;
1355
1356 rose_remove_node(t);
1357 }
1358
1359 while (rose_route != NULL) {
1360 u = rose_route;
1361 rose_route = rose_route->next;
1362
1363 rose_remove_route(u);
1364 }
1365}