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// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net)
6 */
7#include <linux/errno.h>
8#include <linux/types.h>
9#include <linux/socket.h>
10#include <linux/in.h>
11#include <linux/kernel.h>
12#include <linux/timer.h>
13#include <linux/string.h>
14#include <linux/sockios.h>
15#include <linux/net.h>
16#include <linux/slab.h>
17#include <net/ax25.h>
18#include <linux/inet.h>
19#include <linux/netdevice.h>
20#include <net/arp.h>
21#include <linux/if_arp.h>
22#include <linux/skbuff.h>
23#include <net/sock.h>
24#include <net/tcp_states.h>
25#include <linux/uaccess.h>
26#include <linux/fcntl.h>
27#include <linux/termios.h> /* For TIOCINQ/OUTQ */
28#include <linux/mm.h>
29#include <linux/interrupt.h>
30#include <linux/notifier.h>
31#include <linux/init.h>
32#include <net/rose.h>
33#include <linux/seq_file.h>
34#include <linux/export.h>
35
36static unsigned int rose_neigh_no = 1;
37
38static struct rose_node *rose_node_list;
39static DEFINE_SPINLOCK(rose_node_list_lock);
40static struct rose_neigh *rose_neigh_list;
41static DEFINE_SPINLOCK(rose_neigh_list_lock);
42static struct rose_route *rose_route_list;
43static DEFINE_SPINLOCK(rose_route_list_lock);
44
45struct rose_neigh *rose_loopback_neigh;
46
47/*
48 * Add a new route to a node, and in the process add the node and the
49 * neighbour if it is new.
50 */
51static int __must_check rose_add_node(struct rose_route_struct *rose_route,
52 struct net_device *dev)
53{
54 struct rose_node *rose_node, *rose_tmpn, *rose_tmpp;
55 struct rose_neigh *rose_neigh;
56 int i, res = 0;
57
58 spin_lock_bh(&rose_node_list_lock);
59 spin_lock_bh(&rose_neigh_list_lock);
60
61 rose_node = rose_node_list;
62 while (rose_node != NULL) {
63 if ((rose_node->mask == rose_route->mask) &&
64 (rosecmpm(&rose_route->address, &rose_node->address,
65 rose_route->mask) == 0))
66 break;
67 rose_node = rose_node->next;
68 }
69
70 if (rose_node != NULL && rose_node->loopback) {
71 res = -EINVAL;
72 goto out;
73 }
74
75 rose_neigh = rose_neigh_list;
76 while (rose_neigh != NULL) {
77 if (ax25cmp(&rose_route->neighbour,
78 &rose_neigh->callsign) == 0 &&
79 rose_neigh->dev == dev)
80 break;
81 rose_neigh = rose_neigh->next;
82 }
83
84 if (rose_neigh == NULL) {
85 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
86 if (rose_neigh == NULL) {
87 res = -ENOMEM;
88 goto out;
89 }
90
91 rose_neigh->callsign = rose_route->neighbour;
92 rose_neigh->digipeat = NULL;
93 rose_neigh->ax25 = NULL;
94 rose_neigh->dev = dev;
95 rose_neigh->count = 0;
96 rose_neigh->use = 0;
97 rose_neigh->dce_mode = 0;
98 rose_neigh->loopback = 0;
99 rose_neigh->number = rose_neigh_no++;
100 rose_neigh->restarted = 0;
101
102 skb_queue_head_init(&rose_neigh->queue);
103
104 timer_setup(&rose_neigh->ftimer, NULL, 0);
105 timer_setup(&rose_neigh->t0timer, NULL, 0);
106
107 if (rose_route->ndigis != 0) {
108 rose_neigh->digipeat =
109 kmalloc(sizeof(ax25_digi), GFP_ATOMIC);
110 if (rose_neigh->digipeat == 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
192out:
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 */
202static 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 */
226static void rose_remove_neigh(struct rose_neigh *rose_neigh)
227{
228 struct rose_neigh *s;
229
230 del_timer_sync(&rose_neigh->ftimer);
231 del_timer_sync(&rose_neigh->t0timer);
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 if (rose_neigh->ax25)
238 ax25_cb_put(rose_neigh->ax25);
239 kfree(rose_neigh->digipeat);
240 kfree(rose_neigh);
241 return;
242 }
243
244 while (s != NULL && s->next != NULL) {
245 if (s->next == rose_neigh) {
246 s->next = rose_neigh->next;
247 if (rose_neigh->ax25)
248 ax25_cb_put(rose_neigh->ax25);
249 kfree(rose_neigh->digipeat);
250 kfree(rose_neigh);
251 return;
252 }
253
254 s = s->next;
255 }
256}
257
258/*
259 * Caller is holding rose_route_list_lock.
260 */
261static void rose_remove_route(struct rose_route *rose_route)
262{
263 struct rose_route *s;
264
265 if (rose_route->neigh1 != NULL)
266 rose_route->neigh1->use--;
267
268 if (rose_route->neigh2 != NULL)
269 rose_route->neigh2->use--;
270
271 if ((s = rose_route_list) == rose_route) {
272 rose_route_list = rose_route->next;
273 kfree(rose_route);
274 return;
275 }
276
277 while (s != NULL && s->next != NULL) {
278 if (s->next == rose_route) {
279 s->next = rose_route->next;
280 kfree(rose_route);
281 return;
282 }
283
284 s = s->next;
285 }
286}
287
288/*
289 * "Delete" a node. Strictly speaking remove a route to a node. The node
290 * is only deleted if no routes are left to it.
291 */
292static int rose_del_node(struct rose_route_struct *rose_route,
293 struct net_device *dev)
294{
295 struct rose_node *rose_node;
296 struct rose_neigh *rose_neigh;
297 int i, err = 0;
298
299 spin_lock_bh(&rose_node_list_lock);
300 spin_lock_bh(&rose_neigh_list_lock);
301
302 rose_node = rose_node_list;
303 while (rose_node != NULL) {
304 if ((rose_node->mask == rose_route->mask) &&
305 (rosecmpm(&rose_route->address, &rose_node->address,
306 rose_route->mask) == 0))
307 break;
308 rose_node = rose_node->next;
309 }
310
311 if (rose_node == NULL || rose_node->loopback) {
312 err = -EINVAL;
313 goto out;
314 }
315
316 rose_neigh = rose_neigh_list;
317 while (rose_neigh != NULL) {
318 if (ax25cmp(&rose_route->neighbour,
319 &rose_neigh->callsign) == 0 &&
320 rose_neigh->dev == dev)
321 break;
322 rose_neigh = rose_neigh->next;
323 }
324
325 if (rose_neigh == NULL) {
326 err = -EINVAL;
327 goto out;
328 }
329
330 for (i = 0; i < rose_node->count; i++) {
331 if (rose_node->neighbour[i] == rose_neigh) {
332 rose_neigh->count--;
333
334 if (rose_neigh->count == 0 && rose_neigh->use == 0)
335 rose_remove_neigh(rose_neigh);
336
337 rose_node->count--;
338
339 if (rose_node->count == 0) {
340 rose_remove_node(rose_node);
341 } else {
342 switch (i) {
343 case 0:
344 rose_node->neighbour[0] =
345 rose_node->neighbour[1];
346 fallthrough;
347 case 1:
348 rose_node->neighbour[1] =
349 rose_node->neighbour[2];
350 break;
351 case 2:
352 break;
353 }
354 }
355 goto out;
356 }
357 }
358 err = -EINVAL;
359
360out:
361 spin_unlock_bh(&rose_neigh_list_lock);
362 spin_unlock_bh(&rose_node_list_lock);
363
364 return err;
365}
366
367/*
368 * Add the loopback neighbour.
369 */
370void rose_add_loopback_neigh(void)
371{
372 struct rose_neigh *sn;
373
374 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL);
375 if (!rose_loopback_neigh)
376 return;
377 sn = rose_loopback_neigh;
378
379 sn->callsign = null_ax25_address;
380 sn->digipeat = NULL;
381 sn->ax25 = NULL;
382 sn->dev = NULL;
383 sn->count = 0;
384 sn->use = 0;
385 sn->dce_mode = 1;
386 sn->loopback = 1;
387 sn->number = rose_neigh_no++;
388 sn->restarted = 1;
389
390 skb_queue_head_init(&sn->queue);
391
392 timer_setup(&sn->ftimer, NULL, 0);
393 timer_setup(&sn->t0timer, NULL, 0);
394
395 spin_lock_bh(&rose_neigh_list_lock);
396 sn->next = rose_neigh_list;
397 rose_neigh_list = sn;
398 spin_unlock_bh(&rose_neigh_list_lock);
399}
400
401/*
402 * Add a loopback node.
403 */
404int rose_add_loopback_node(const rose_address *address)
405{
406 struct rose_node *rose_node;
407 int err = 0;
408
409 spin_lock_bh(&rose_node_list_lock);
410
411 rose_node = rose_node_list;
412 while (rose_node != NULL) {
413 if ((rose_node->mask == 10) &&
414 (rosecmpm(address, &rose_node->address, 10) == 0) &&
415 rose_node->loopback)
416 break;
417 rose_node = rose_node->next;
418 }
419
420 if (rose_node != NULL)
421 goto out;
422
423 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
424 err = -ENOMEM;
425 goto out;
426 }
427
428 rose_node->address = *address;
429 rose_node->mask = 10;
430 rose_node->count = 1;
431 rose_node->loopback = 1;
432 rose_node->neighbour[0] = rose_loopback_neigh;
433
434 /* Insert at the head of list. Address is always mask=10 */
435 rose_node->next = rose_node_list;
436 rose_node_list = rose_node;
437
438 rose_loopback_neigh->count++;
439
440out:
441 spin_unlock_bh(&rose_node_list_lock);
442
443 return err;
444}
445
446/*
447 * Delete a loopback node.
448 */
449void rose_del_loopback_node(const rose_address *address)
450{
451 struct rose_node *rose_node;
452
453 spin_lock_bh(&rose_node_list_lock);
454
455 rose_node = rose_node_list;
456 while (rose_node != NULL) {
457 if ((rose_node->mask == 10) &&
458 (rosecmpm(address, &rose_node->address, 10) == 0) &&
459 rose_node->loopback)
460 break;
461 rose_node = rose_node->next;
462 }
463
464 if (rose_node == NULL)
465 goto out;
466
467 rose_remove_node(rose_node);
468
469 rose_loopback_neigh->count--;
470
471out:
472 spin_unlock_bh(&rose_node_list_lock);
473}
474
475/*
476 * A device has been removed. Remove its routes and neighbours.
477 */
478void rose_rt_device_down(struct net_device *dev)
479{
480 struct rose_neigh *s, *rose_neigh;
481 struct rose_node *t, *rose_node;
482 int i;
483
484 spin_lock_bh(&rose_node_list_lock);
485 spin_lock_bh(&rose_neigh_list_lock);
486 rose_neigh = rose_neigh_list;
487 while (rose_neigh != NULL) {
488 s = rose_neigh;
489 rose_neigh = rose_neigh->next;
490
491 if (s->dev != dev)
492 continue;
493
494 rose_node = rose_node_list;
495
496 while (rose_node != NULL) {
497 t = rose_node;
498 rose_node = rose_node->next;
499
500 for (i = 0; i < t->count; i++) {
501 if (t->neighbour[i] != s)
502 continue;
503
504 t->count--;
505
506 switch (i) {
507 case 0:
508 t->neighbour[0] = t->neighbour[1];
509 fallthrough;
510 case 1:
511 t->neighbour[1] = t->neighbour[2];
512 break;
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 if (first)
619 dev_hold(first);
620 rcu_read_unlock();
621
622 return first;
623}
624
625/*
626 * Find the ROSE device for the given address.
627 */
628struct net_device *rose_dev_get(rose_address *addr)
629{
630 struct net_device *dev;
631
632 rcu_read_lock();
633 for_each_netdev_rcu(&init_net, dev) {
634 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE &&
635 rosecmp(addr, (const rose_address *)dev->dev_addr) == 0) {
636 dev_hold(dev);
637 goto out;
638 }
639 }
640 dev = NULL;
641out:
642 rcu_read_unlock();
643 return dev;
644}
645
646static int rose_dev_exists(rose_address *addr)
647{
648 struct net_device *dev;
649
650 rcu_read_lock();
651 for_each_netdev_rcu(&init_net, dev) {
652 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE &&
653 rosecmp(addr, (const rose_address *)dev->dev_addr) == 0)
654 goto out;
655 }
656 dev = NULL;
657out:
658 rcu_read_unlock();
659 return dev != NULL;
660}
661
662
663
664
665struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
666{
667 struct rose_route *rose_route;
668
669 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
670 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
671 (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
672 return rose_route;
673
674 return NULL;
675}
676
677/*
678 * Find a neighbour or a route given a ROSE address.
679 */
680struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
681 unsigned char *diagnostic, int route_frame)
682{
683 struct rose_neigh *res = NULL;
684 struct rose_node *node;
685 int failed = 0;
686 int i;
687
688 if (!route_frame) spin_lock_bh(&rose_node_list_lock);
689 for (node = rose_node_list; node != NULL; node = node->next) {
690 if (rosecmpm(addr, &node->address, node->mask) == 0) {
691 for (i = 0; i < node->count; i++) {
692 if (node->neighbour[i]->restarted) {
693 res = node->neighbour[i];
694 goto out;
695 }
696 }
697 }
698 }
699 if (!route_frame) { /* connect request */
700 for (node = rose_node_list; node != NULL; node = node->next) {
701 if (rosecmpm(addr, &node->address, node->mask) == 0) {
702 for (i = 0; i < node->count; i++) {
703 if (!rose_ftimer_running(node->neighbour[i])) {
704 res = node->neighbour[i];
705 goto out;
706 }
707 failed = 1;
708 }
709 }
710 }
711 }
712
713 if (failed) {
714 *cause = ROSE_OUT_OF_ORDER;
715 *diagnostic = 0;
716 } else {
717 *cause = ROSE_NOT_OBTAINABLE;
718 *diagnostic = 0;
719 }
720
721out:
722 if (!route_frame) spin_unlock_bh(&rose_node_list_lock);
723 return res;
724}
725
726/*
727 * Handle the ioctls that control the routing functions.
728 */
729int rose_rt_ioctl(unsigned int cmd, void __user *arg)
730{
731 struct rose_route_struct rose_route;
732 struct net_device *dev;
733 int err;
734
735 switch (cmd) {
736 case SIOCADDRT:
737 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
738 return -EFAULT;
739 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
740 return -EINVAL;
741 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */
742 return -EINVAL;
743 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
744 return -EINVAL;
745 if (rose_route.ndigis > AX25_MAX_DIGIS)
746 return -EINVAL;
747 err = rose_add_node(&rose_route, dev);
748 return err;
749
750 case SIOCDELRT:
751 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
752 return -EFAULT;
753 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
754 return -EINVAL;
755 err = rose_del_node(&rose_route, dev);
756 return err;
757
758 case SIOCRSCLRRT:
759 return rose_clear_routes();
760
761 default:
762 return -EINVAL;
763 }
764
765 return 0;
766}
767
768static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
769{
770 struct rose_route *rose_route, *s;
771
772 rose_neigh->restarted = 0;
773
774 rose_stop_t0timer(rose_neigh);
775 rose_start_ftimer(rose_neigh);
776
777 skb_queue_purge(&rose_neigh->queue);
778
779 spin_lock_bh(&rose_route_list_lock);
780
781 rose_route = rose_route_list;
782
783 while (rose_route != NULL) {
784 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
785 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) ||
786 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
787 s = rose_route->next;
788 rose_remove_route(rose_route);
789 rose_route = s;
790 continue;
791 }
792
793 if (rose_route->neigh1 == rose_neigh) {
794 rose_route->neigh1->use--;
795 rose_route->neigh1 = NULL;
796 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
797 }
798
799 if (rose_route->neigh2 == rose_neigh) {
800 rose_route->neigh2->use--;
801 rose_route->neigh2 = NULL;
802 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
803 }
804
805 rose_route = rose_route->next;
806 }
807 spin_unlock_bh(&rose_route_list_lock);
808}
809
810/*
811 * A level 2 link has timed out, therefore it appears to be a poor link,
812 * then don't use that neighbour until it is reset. Blow away all through
813 * routes and connections using this route.
814 */
815void rose_link_failed(ax25_cb *ax25, int reason)
816{
817 struct rose_neigh *rose_neigh;
818
819 spin_lock_bh(&rose_neigh_list_lock);
820 rose_neigh = rose_neigh_list;
821 while (rose_neigh != NULL) {
822 if (rose_neigh->ax25 == ax25)
823 break;
824 rose_neigh = rose_neigh->next;
825 }
826
827 if (rose_neigh != NULL) {
828 rose_neigh->ax25 = NULL;
829 ax25_cb_put(ax25);
830
831 rose_del_route_by_neigh(rose_neigh);
832 rose_kill_by_neigh(rose_neigh);
833 }
834 spin_unlock_bh(&rose_neigh_list_lock);
835}
836
837/*
838 * A device has been "downed" remove its link status. Blow away all
839 * through routes and connections that use this device.
840 */
841void rose_link_device_down(struct net_device *dev)
842{
843 struct rose_neigh *rose_neigh;
844
845 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
846 if (rose_neigh->dev == dev) {
847 rose_del_route_by_neigh(rose_neigh);
848 rose_kill_by_neigh(rose_neigh);
849 }
850 }
851}
852
853/*
854 * Route a frame to an appropriate AX.25 connection.
855 * A NULL ax25_cb indicates an internally generated frame.
856 */
857int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
858{
859 struct rose_neigh *rose_neigh, *new_neigh;
860 struct rose_route *rose_route;
861 struct rose_facilities_struct facilities;
862 rose_address *src_addr, *dest_addr;
863 struct sock *sk;
864 unsigned short frametype;
865 unsigned int lci, new_lci;
866 unsigned char cause, diagnostic;
867 struct net_device *dev;
868 int res = 0;
869 char buf[11];
870
871 if (skb->len < ROSE_MIN_LEN)
872 return res;
873
874 if (!ax25)
875 return rose_loopback_queue(skb, NULL);
876
877 frametype = skb->data[2];
878 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
879 if (frametype == ROSE_CALL_REQUEST &&
880 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
881 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
882 ROSE_CALL_REQ_ADDR_LEN_VAL))
883 return res;
884 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF);
885 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
886
887 spin_lock_bh(&rose_neigh_list_lock);
888 spin_lock_bh(&rose_route_list_lock);
889
890 rose_neigh = rose_neigh_list;
891 while (rose_neigh != NULL) {
892 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
893 ax25->ax25_dev->dev == rose_neigh->dev)
894 break;
895 rose_neigh = rose_neigh->next;
896 }
897
898 if (rose_neigh == NULL) {
899 printk("rose_route : unknown neighbour or device %s\n",
900 ax2asc(buf, &ax25->dest_addr));
901 goto out;
902 }
903
904 /*
905 * Obviously the link is working, halt the ftimer.
906 */
907 rose_stop_ftimer(rose_neigh);
908
909 /*
910 * LCI of zero is always for us, and its always a restart
911 * frame.
912 */
913 if (lci == 0) {
914 rose_link_rx_restart(skb, rose_neigh, frametype);
915 goto out;
916 }
917
918 /*
919 * Find an existing socket.
920 */
921 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
922 if (frametype == ROSE_CALL_REQUEST) {
923 struct rose_sock *rose = rose_sk(sk);
924
925 /* Remove an existing unused socket */
926 rose_clear_queues(sk);
927 rose->cause = ROSE_NETWORK_CONGESTION;
928 rose->diagnostic = 0;
929 rose->neighbour->use--;
930 rose->neighbour = NULL;
931 rose->lci = 0;
932 rose->state = ROSE_STATE_0;
933 sk->sk_state = TCP_CLOSE;
934 sk->sk_err = 0;
935 sk->sk_shutdown |= SEND_SHUTDOWN;
936 if (!sock_flag(sk, SOCK_DEAD)) {
937 sk->sk_state_change(sk);
938 sock_set_flag(sk, SOCK_DEAD);
939 }
940 }
941 else {
942 skb_reset_transport_header(skb);
943 res = rose_process_rx_frame(sk, skb);
944 goto out;
945 }
946 }
947
948 /*
949 * Is is a Call Request and is it for us ?
950 */
951 if (frametype == ROSE_CALL_REQUEST)
952 if ((dev = rose_dev_get(dest_addr)) != NULL) {
953 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
954 dev_put(dev);
955 goto out;
956 }
957
958 if (!sysctl_rose_routing_control) {
959 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
960 goto out;
961 }
962
963 /*
964 * Route it to the next in line if we have an entry for it.
965 */
966 rose_route = rose_route_list;
967 while (rose_route != NULL) {
968 if (rose_route->lci1 == lci &&
969 rose_route->neigh1 == rose_neigh) {
970 if (frametype == ROSE_CALL_REQUEST) {
971 /* F6FBB - Remove an existing unused route */
972 rose_remove_route(rose_route);
973 break;
974 } else if (rose_route->neigh2 != NULL) {
975 skb->data[0] &= 0xF0;
976 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
977 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
978 rose_transmit_link(skb, rose_route->neigh2);
979 if (frametype == ROSE_CLEAR_CONFIRMATION)
980 rose_remove_route(rose_route);
981 res = 1;
982 goto out;
983 } else {
984 if (frametype == ROSE_CLEAR_CONFIRMATION)
985 rose_remove_route(rose_route);
986 goto out;
987 }
988 }
989 if (rose_route->lci2 == lci &&
990 rose_route->neigh2 == rose_neigh) {
991 if (frametype == ROSE_CALL_REQUEST) {
992 /* F6FBB - Remove an existing unused route */
993 rose_remove_route(rose_route);
994 break;
995 } else if (rose_route->neigh1 != NULL) {
996 skb->data[0] &= 0xF0;
997 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
998 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
999 rose_transmit_link(skb, rose_route->neigh1);
1000 if (frametype == ROSE_CLEAR_CONFIRMATION)
1001 rose_remove_route(rose_route);
1002 res = 1;
1003 goto out;
1004 } else {
1005 if (frametype == ROSE_CLEAR_CONFIRMATION)
1006 rose_remove_route(rose_route);
1007 goto out;
1008 }
1009 }
1010 rose_route = rose_route->next;
1011 }
1012
1013 /*
1014 * We know that:
1015 * 1. The frame isn't for us,
1016 * 2. It isn't "owned" by any existing route.
1017 */
1018 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
1019 res = 0;
1020 goto out;
1021 }
1022
1023 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1024
1025 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF,
1026 skb->len - ROSE_CALL_REQ_FACILITIES_OFF,
1027 &facilities)) {
1028 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1029 goto out;
1030 }
1031
1032 /*
1033 * Check for routing loops.
1034 */
1035 rose_route = rose_route_list;
1036 while (rose_route != NULL) {
1037 if (rose_route->rand == facilities.rand &&
1038 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1039 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1040 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1041 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1042 goto out;
1043 }
1044 rose_route = rose_route->next;
1045 }
1046
1047 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) {
1048 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1049 goto out;
1050 }
1051
1052 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1053 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1054 goto out;
1055 }
1056
1057 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1058 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1059 goto out;
1060 }
1061
1062 rose_route->lci1 = lci;
1063 rose_route->src_addr = *src_addr;
1064 rose_route->dest_addr = *dest_addr;
1065 rose_route->src_call = facilities.dest_call;
1066 rose_route->dest_call = facilities.source_call;
1067 rose_route->rand = facilities.rand;
1068 rose_route->neigh1 = rose_neigh;
1069 rose_route->lci2 = new_lci;
1070 rose_route->neigh2 = new_neigh;
1071
1072 rose_route->neigh1->use++;
1073 rose_route->neigh2->use++;
1074
1075 rose_route->next = rose_route_list;
1076 rose_route_list = rose_route;
1077
1078 skb->data[0] &= 0xF0;
1079 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1080 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1081
1082 rose_transmit_link(skb, rose_route->neigh2);
1083 res = 1;
1084
1085out:
1086 spin_unlock_bh(&rose_route_list_lock);
1087 spin_unlock_bh(&rose_neigh_list_lock);
1088
1089 return res;
1090}
1091
1092#ifdef CONFIG_PROC_FS
1093
1094static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1095 __acquires(rose_node_list_lock)
1096{
1097 struct rose_node *rose_node;
1098 int i = 1;
1099
1100 spin_lock_bh(&rose_node_list_lock);
1101 if (*pos == 0)
1102 return SEQ_START_TOKEN;
1103
1104 for (rose_node = rose_node_list; rose_node && i < *pos;
1105 rose_node = rose_node->next, ++i);
1106
1107 return (i == *pos) ? rose_node : NULL;
1108}
1109
1110static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1111{
1112 ++*pos;
1113
1114 return (v == SEQ_START_TOKEN) ? rose_node_list
1115 : ((struct rose_node *)v)->next;
1116}
1117
1118static void rose_node_stop(struct seq_file *seq, void *v)
1119 __releases(rose_node_list_lock)
1120{
1121 spin_unlock_bh(&rose_node_list_lock);
1122}
1123
1124static int rose_node_show(struct seq_file *seq, void *v)
1125{
1126 char rsbuf[11];
1127 int i;
1128
1129 if (v == SEQ_START_TOKEN)
1130 seq_puts(seq, "address mask n neigh neigh neigh\n");
1131 else {
1132 const struct rose_node *rose_node = v;
1133 seq_printf(seq, "%-10s %04d %d",
1134 rose2asc(rsbuf, &rose_node->address),
1135 rose_node->mask,
1136 rose_node->count);
1137
1138 for (i = 0; i < rose_node->count; i++)
1139 seq_printf(seq, " %05d", rose_node->neighbour[i]->number);
1140
1141 seq_puts(seq, "\n");
1142 }
1143 return 0;
1144}
1145
1146const struct seq_operations rose_node_seqops = {
1147 .start = rose_node_start,
1148 .next = rose_node_next,
1149 .stop = rose_node_stop,
1150 .show = rose_node_show,
1151};
1152
1153static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1154 __acquires(rose_neigh_list_lock)
1155{
1156 struct rose_neigh *rose_neigh;
1157 int i = 1;
1158
1159 spin_lock_bh(&rose_neigh_list_lock);
1160 if (*pos == 0)
1161 return SEQ_START_TOKEN;
1162
1163 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1164 rose_neigh = rose_neigh->next, ++i);
1165
1166 return (i == *pos) ? rose_neigh : NULL;
1167}
1168
1169static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1170{
1171 ++*pos;
1172
1173 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1174 : ((struct rose_neigh *)v)->next;
1175}
1176
1177static void rose_neigh_stop(struct seq_file *seq, void *v)
1178 __releases(rose_neigh_list_lock)
1179{
1180 spin_unlock_bh(&rose_neigh_list_lock);
1181}
1182
1183static int rose_neigh_show(struct seq_file *seq, void *v)
1184{
1185 char buf[11];
1186 int i;
1187
1188 if (v == SEQ_START_TOKEN)
1189 seq_puts(seq,
1190 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1191 else {
1192 struct rose_neigh *rose_neigh = v;
1193
1194 /* if (!rose_neigh->loopback) { */
1195 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1196 rose_neigh->number,
1197 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1198 rose_neigh->dev ? rose_neigh->dev->name : "???",
1199 rose_neigh->count,
1200 rose_neigh->use,
1201 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1202 (rose_neigh->restarted) ? "yes" : "no",
1203 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1204 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1205
1206 if (rose_neigh->digipeat != NULL) {
1207 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1208 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1209 }
1210
1211 seq_puts(seq, "\n");
1212 }
1213 return 0;
1214}
1215
1216
1217const struct seq_operations rose_neigh_seqops = {
1218 .start = rose_neigh_start,
1219 .next = rose_neigh_next,
1220 .stop = rose_neigh_stop,
1221 .show = rose_neigh_show,
1222};
1223
1224static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1225 __acquires(rose_route_list_lock)
1226{
1227 struct rose_route *rose_route;
1228 int i = 1;
1229
1230 spin_lock_bh(&rose_route_list_lock);
1231 if (*pos == 0)
1232 return SEQ_START_TOKEN;
1233
1234 for (rose_route = rose_route_list; rose_route && i < *pos;
1235 rose_route = rose_route->next, ++i);
1236
1237 return (i == *pos) ? rose_route : NULL;
1238}
1239
1240static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1241{
1242 ++*pos;
1243
1244 return (v == SEQ_START_TOKEN) ? rose_route_list
1245 : ((struct rose_route *)v)->next;
1246}
1247
1248static void rose_route_stop(struct seq_file *seq, void *v)
1249 __releases(rose_route_list_lock)
1250{
1251 spin_unlock_bh(&rose_route_list_lock);
1252}
1253
1254static int rose_route_show(struct seq_file *seq, void *v)
1255{
1256 char buf[11], rsbuf[11];
1257
1258 if (v == SEQ_START_TOKEN)
1259 seq_puts(seq,
1260 "lci address callsign neigh <-> lci address callsign neigh\n");
1261 else {
1262 struct rose_route *rose_route = v;
1263
1264 if (rose_route->neigh1)
1265 seq_printf(seq,
1266 "%3.3X %-10s %-9s %05d ",
1267 rose_route->lci1,
1268 rose2asc(rsbuf, &rose_route->src_addr),
1269 ax2asc(buf, &rose_route->src_call),
1270 rose_route->neigh1->number);
1271 else
1272 seq_puts(seq,
1273 "000 * * 00000 ");
1274
1275 if (rose_route->neigh2)
1276 seq_printf(seq,
1277 "%3.3X %-10s %-9s %05d\n",
1278 rose_route->lci2,
1279 rose2asc(rsbuf, &rose_route->dest_addr),
1280 ax2asc(buf, &rose_route->dest_call),
1281 rose_route->neigh2->number);
1282 else
1283 seq_puts(seq,
1284 "000 * * 00000\n");
1285 }
1286 return 0;
1287}
1288
1289struct seq_operations rose_route_seqops = {
1290 .start = rose_route_start,
1291 .next = rose_route_next,
1292 .stop = rose_route_stop,
1293 .show = rose_route_show,
1294};
1295#endif /* CONFIG_PROC_FS */
1296
1297/*
1298 * Release all memory associated with ROSE routing structures.
1299 */
1300void __exit rose_rt_free(void)
1301{
1302 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1303 struct rose_node *t, *rose_node = rose_node_list;
1304 struct rose_route *u, *rose_route = rose_route_list;
1305
1306 while (rose_neigh != NULL) {
1307 s = rose_neigh;
1308 rose_neigh = rose_neigh->next;
1309
1310 rose_remove_neigh(s);
1311 }
1312
1313 while (rose_node != NULL) {
1314 t = rose_node;
1315 rose_node = rose_node->next;
1316
1317 rose_remove_node(t);
1318 }
1319
1320 while (rose_route != NULL) {
1321 u = rose_route;
1322 rose_route = rose_route->next;
1323
1324 rose_remove_route(u);
1325 }
1326}