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NET: ROSE: Don't use static buffer.
[linux-2.6/verdex.git] / net / rose / rose_route.c
blob9478d9b3d9777643bcd821fed4a380f8a4123553
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net)
9 */
10 #include <linux/errno.h>
11 #include <linux/types.h>
12 #include <linux/socket.h>
13 #include <linux/in.h>
14 #include <linux/kernel.h>
15 #include <linux/timer.h>
16 #include <linux/string.h>
17 #include <linux/sockios.h>
18 #include <linux/net.h>
19 #include <net/ax25.h>
20 #include <linux/inet.h>
21 #include <linux/netdevice.h>
22 #include <net/arp.h>
23 #include <linux/if_arp.h>
24 #include <linux/skbuff.h>
25 #include <net/sock.h>
26 #include <net/tcp_states.h>
27 #include <asm/system.h>
28 #include <asm/uaccess.h>
29 #include <linux/fcntl.h>
30 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
31 #include <linux/mm.h>
32 #include <linux/interrupt.h>
33 #include <linux/notifier.h>
34 #include <linux/netfilter.h>
35 #include <linux/init.h>
36 #include <net/rose.h>
37 #include <linux/seq_file.h>
38
39 static unsigned int rose_neigh_no = 1;
40
41 static struct rose_node *rose_node_list;
42 static DEFINE_SPINLOCK(rose_node_list_lock);
43 static struct rose_neigh *rose_neigh_list;
44 static DEFINE_SPINLOCK(rose_neigh_list_lock);
45 static struct rose_route *rose_route_list;
46 static DEFINE_SPINLOCK(rose_route_list_lock);
47
48 struct rose_neigh *rose_loopback_neigh;
49
50 /*
51 * Add a new route to a node, and in the process add the node and the
52 * neighbour if it is new.
53 */
54 static int __must_check rose_add_node(struct rose_route_struct *rose_route,
55 struct net_device *dev)
56 {
57 struct rose_node *rose_node, *rose_tmpn, *rose_tmpp;
58 struct rose_neigh *rose_neigh;
59 int i, res = 0;
60
61 spin_lock_bh(&rose_node_list_lock);
62 spin_lock_bh(&rose_neigh_list_lock);
63
64 rose_node = rose_node_list;
65 while (rose_node != NULL) {
66 if ((rose_node->mask == rose_route->mask) &&
67 (rosecmpm(&rose_route->address, &rose_node->address,
68 rose_route->mask) == 0))
69 break;
70 rose_node = rose_node->next;
71 }
72
73 if (rose_node != NULL && rose_node->loopback) {
74 res = -EINVAL;
75 goto out;
76 }
77
78 rose_neigh = rose_neigh_list;
79 while (rose_neigh != NULL) {
80 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
81 && rose_neigh->dev == dev)
82 break;
83 rose_neigh = rose_neigh->next;
84 }
85
86 if (rose_neigh == NULL) {
87 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
88 if (rose_neigh == NULL) {
89 res = -ENOMEM;
90 goto out;
91 }
92
93 rose_neigh->callsign = rose_route->neighbour;
94 rose_neigh->digipeat = NULL;
95 rose_neigh->ax25 = NULL;
96 rose_neigh->dev = dev;
97 rose_neigh->count = 0;
98 rose_neigh->use = 0;
99 rose_neigh->dce_mode = 0;
100 rose_neigh->loopback = 0;
101 rose_neigh->number = rose_neigh_no++;
102 rose_neigh->restarted = 0;
103
104 skb_queue_head_init(&rose_neigh->queue);
105
106 init_timer(&rose_neigh->ftimer);
107 init_timer(&rose_neigh->t0timer);
108
109 if (rose_route->ndigis != 0) {
110 if ((rose_neigh->digipeat = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
111 kfree(rose_neigh);
112 res = -ENOMEM;
113 goto out;
114 }
115
116 rose_neigh->digipeat->ndigi = rose_route->ndigis;
117 rose_neigh->digipeat->lastrepeat = -1;
118
119 for (i = 0; i < rose_route->ndigis; i++) {
120 rose_neigh->digipeat->calls[i] =
121 rose_route->digipeaters[i];
122 rose_neigh->digipeat->repeated[i] = 0;
123 }
124 }
125
126 rose_neigh->next = rose_neigh_list;
127 rose_neigh_list = rose_neigh;
128 }
129
130 /*
131 * This is a new node to be inserted into the list. Find where it needs
132 * to be inserted into the list, and insert it. We want to be sure
133 * to order the list in descending order of mask size to ensure that
134 * later when we are searching this list the first match will be the
135 * best match.
136 */
137 if (rose_node == NULL) {
138 rose_tmpn = rose_node_list;
139 rose_tmpp = NULL;
140
141 while (rose_tmpn != NULL) {
142 if (rose_tmpn->mask > rose_route->mask) {
143 rose_tmpp = rose_tmpn;
144 rose_tmpn = rose_tmpn->next;
145 } else {
146 break;
147 }
148 }
149
150 /* create new node */
151 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
152 if (rose_node == NULL) {
153 res = -ENOMEM;
154 goto out;
155 }
156
157 rose_node->address = rose_route->address;
158 rose_node->mask = rose_route->mask;
159 rose_node->count = 1;
160 rose_node->loopback = 0;
161 rose_node->neighbour[0] = rose_neigh;
162
163 if (rose_tmpn == NULL) {
164 if (rose_tmpp == NULL) { /* Empty list */
165 rose_node_list = rose_node;
166 rose_node->next = NULL;
167 } else {
168 rose_tmpp->next = rose_node;
169 rose_node->next = NULL;
170 }
171 } else {
172 if (rose_tmpp == NULL) { /* 1st node */
173 rose_node->next = rose_node_list;
174 rose_node_list = rose_node;
175 } else {
176 rose_tmpp->next = rose_node;
177 rose_node->next = rose_tmpn;
178 }
179 }
180 rose_neigh->count++;
181
182 goto out;
183 }
184
185 /* We have space, slot it in */
186 if (rose_node->count < 3) {
187 rose_node->neighbour[rose_node->count] = rose_neigh;
188 rose_node->count++;
189 rose_neigh->count++;
190 }
191
192 out:
193 spin_unlock_bh(&rose_neigh_list_lock);
194 spin_unlock_bh(&rose_node_list_lock);
195
196 return res;
197 }
198
199 /*
200 * Caller is holding rose_node_list_lock.
201 */
202 static void rose_remove_node(struct rose_node *rose_node)
203 {
204 struct rose_node *s;
205
206 if ((s = rose_node_list) == rose_node) {
207 rose_node_list = rose_node->next;
208 kfree(rose_node);
209 return;
210 }
211
212 while (s != NULL && s->next != NULL) {
213 if (s->next == rose_node) {
214 s->next = rose_node->next;
215 kfree(rose_node);
216 return;
217 }
218
219 s = s->next;
220 }
221 }
222
223 /*
224 * Caller is holding rose_neigh_list_lock.
225 */
226 static void rose_remove_neigh(struct rose_neigh *rose_neigh)
227 {
228 struct rose_neigh *s;
229
230 rose_stop_ftimer(rose_neigh);
231 rose_stop_t0timer(rose_neigh);
232
233 skb_queue_purge(&rose_neigh->queue);
234
235 if ((s = rose_neigh_list) == rose_neigh) {
236 rose_neigh_list = rose_neigh->next;
237 kfree(rose_neigh->digipeat);
238 kfree(rose_neigh);
239 return;
240 }
241
242 while (s != NULL && s->next != NULL) {
243 if (s->next == rose_neigh) {
244 s->next = rose_neigh->next;
245 kfree(rose_neigh->digipeat);
246 kfree(rose_neigh);
247 return;
248 }
249
250 s = s->next;
251 }
252 }
253
254 /*
255 * Caller is holding rose_route_list_lock.
256 */
257 static void rose_remove_route(struct rose_route *rose_route)
258 {
259 struct rose_route *s;
260
261 if (rose_route->neigh1 != NULL)
262 rose_route->neigh1->use--;
263
264 if (rose_route->neigh2 != NULL)
265 rose_route->neigh2->use--;
266
267 if ((s = rose_route_list) == rose_route) {
268 rose_route_list = rose_route->next;
269 kfree(rose_route);
270 return;
271 }
272
273 while (s != NULL && s->next != NULL) {
274 if (s->next == rose_route) {
275 s->next = rose_route->next;
276 kfree(rose_route);
277 return;
278 }
279
280 s = s->next;
281 }
282 }
283
284 /*
285 * "Delete" a node. Strictly speaking remove a route to a node. The node
286 * is only deleted if no routes are left to it.
287 */
288 static int rose_del_node(struct rose_route_struct *rose_route,
289 struct net_device *dev)
290 {
291 struct rose_node *rose_node;
292 struct rose_neigh *rose_neigh;
293 int i, err = 0;
294
295 spin_lock_bh(&rose_node_list_lock);
296 spin_lock_bh(&rose_neigh_list_lock);
297
298 rose_node = rose_node_list;
299 while (rose_node != NULL) {
300 if ((rose_node->mask == rose_route->mask) &&
301 (rosecmpm(&rose_route->address, &rose_node->address,
302 rose_route->mask) == 0))
303 break;
304 rose_node = rose_node->next;
305 }
306
307 if (rose_node == NULL || rose_node->loopback) {
308 err = -EINVAL;
309 goto out;
310 }
311
312 rose_neigh = rose_neigh_list;
313 while (rose_neigh != NULL) {
314 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
315 && rose_neigh->dev == dev)
316 break;
317 rose_neigh = rose_neigh->next;
318 }
319
320 if (rose_neigh == NULL) {
321 err = -EINVAL;
322 goto out;
323 }
324
325 for (i = 0; i < rose_node->count; i++) {
326 if (rose_node->neighbour[i] == rose_neigh) {
327 rose_neigh->count--;
328
329 if (rose_neigh->count == 0 && rose_neigh->use == 0)
330 rose_remove_neigh(rose_neigh);
331
332 rose_node->count--;
333
334 if (rose_node->count == 0) {
335 rose_remove_node(rose_node);
336 } else {
337 switch (i) {
338 case 0:
339 rose_node->neighbour[0] =
340 rose_node->neighbour[1];
341 case 1:
342 rose_node->neighbour[1] =
343 rose_node->neighbour[2];
344 case 2:
345 break;
346 }
347 }
348 goto out;
349 }
350 }
351 err = -EINVAL;
352
353 out:
354 spin_unlock_bh(&rose_neigh_list_lock);
355 spin_unlock_bh(&rose_node_list_lock);
356
357 return err;
358 }
359
360 /*
361 * Add the loopback neighbour.
362 */
363 void rose_add_loopback_neigh(void)
364 {
365 struct rose_neigh *sn;
366
367 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL);
368 if (!rose_loopback_neigh)
369 return;
370 sn = rose_loopback_neigh;
371
372 sn->callsign = null_ax25_address;
373 sn->digipeat = NULL;
374 sn->ax25 = NULL;
375 sn->dev = NULL;
376 sn->count = 0;
377 sn->use = 0;
378 sn->dce_mode = 1;
379 sn->loopback = 1;
380 sn->number = rose_neigh_no++;
381 sn->restarted = 1;
382
383 skb_queue_head_init(&sn->queue);
384
385 init_timer(&sn->ftimer);
386 init_timer(&sn->t0timer);
387
388 spin_lock_bh(&rose_neigh_list_lock);
389 sn->next = rose_neigh_list;
390 rose_neigh_list = sn;
391 spin_unlock_bh(&rose_neigh_list_lock);
392 }
393
394 /*
395 * Add a loopback node.
396 */
397 int rose_add_loopback_node(rose_address *address)
398 {
399 struct rose_node *rose_node;
400 int err = 0;
401
402 spin_lock_bh(&rose_node_list_lock);
403
404 rose_node = rose_node_list;
405 while (rose_node != NULL) {
406 if ((rose_node->mask == 10) &&
407 (rosecmpm(address, &rose_node->address, 10) == 0) &&
408 rose_node->loopback)
409 break;
410 rose_node = rose_node->next;
411 }
412
413 if (rose_node != NULL)
414 goto out;
415
416 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
417 err = -ENOMEM;
418 goto out;
419 }
420
421 rose_node->address = *address;
422 rose_node->mask = 10;
423 rose_node->count = 1;
424 rose_node->loopback = 1;
425 rose_node->neighbour[0] = rose_loopback_neigh;
426
427 /* Insert at the head of list. Address is always mask=10 */
428 rose_node->next = rose_node_list;
429 rose_node_list = rose_node;
430
431 rose_loopback_neigh->count++;
432
433 out:
434 spin_unlock_bh(&rose_node_list_lock);
435
436 return err;
437 }
438
439 /*
440 * Delete a loopback node.
441 */
442 void rose_del_loopback_node(rose_address *address)
443 {
444 struct rose_node *rose_node;
445
446 spin_lock_bh(&rose_node_list_lock);
447
448 rose_node = rose_node_list;
449 while (rose_node != NULL) {
450 if ((rose_node->mask == 10) &&
451 (rosecmpm(address, &rose_node->address, 10) == 0) &&
452 rose_node->loopback)
453 break;
454 rose_node = rose_node->next;
455 }
456
457 if (rose_node == NULL)
458 goto out;
459
460 rose_remove_node(rose_node);
461
462 rose_loopback_neigh->count--;
463
464 out:
465 spin_unlock_bh(&rose_node_list_lock);
466 }
467
468 /*
469 * A device has been removed. Remove its routes and neighbours.
470 */
471 void rose_rt_device_down(struct net_device *dev)
472 {
473 struct rose_neigh *s, *rose_neigh;
474 struct rose_node *t, *rose_node;
475 int i;
476
477 spin_lock_bh(&rose_node_list_lock);
478 spin_lock_bh(&rose_neigh_list_lock);
479 rose_neigh = rose_neigh_list;
480 while (rose_neigh != NULL) {
481 s = rose_neigh;
482 rose_neigh = rose_neigh->next;
483
484 if (s->dev != dev)
485 continue;
486
487 rose_node = rose_node_list;
488
489 while (rose_node != NULL) {
490 t = rose_node;
491 rose_node = rose_node->next;
492
493 for (i = 0; i < t->count; i++) {
494 if (t->neighbour[i] != s)
495 continue;
496
497 t->count--;
498
499 switch (i) {
500 case 0:
501 t->neighbour[0] = t->neighbour[1];
502 case 1:
503 t->neighbour[1] = t->neighbour[2];
504 case 2:
505 break;
506 }
507 }
508
509 if (t->count <= 0)
510 rose_remove_node(t);
511 }
512
513 rose_remove_neigh(s);
514 }
515 spin_unlock_bh(&rose_neigh_list_lock);
516 spin_unlock_bh(&rose_node_list_lock);
517 }
518
519 #if 0 /* Currently unused */
520 /*
521 * A device has been removed. Remove its links.
522 */
523 void rose_route_device_down(struct net_device *dev)
524 {
525 struct rose_route *s, *rose_route;
526
527 spin_lock_bh(&rose_route_list_lock);
528 rose_route = rose_route_list;
529 while (rose_route != NULL) {
530 s = rose_route;
531 rose_route = rose_route->next;
532
533 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
534 rose_remove_route(s);
535 }
536 spin_unlock_bh(&rose_route_list_lock);
537 }
538 #endif
539
540 /*
541 * Clear all nodes and neighbours out, except for neighbours with
542 * active connections going through them.
543 * Do not clear loopback neighbour and nodes.
544 */
545 static int rose_clear_routes(void)
546 {
547 struct rose_neigh *s, *rose_neigh;
548 struct rose_node *t, *rose_node;
549
550 spin_lock_bh(&rose_node_list_lock);
551 spin_lock_bh(&rose_neigh_list_lock);
552
553 rose_neigh = rose_neigh_list;
554 rose_node = rose_node_list;
555
556 while (rose_node != NULL) {
557 t = rose_node;
558 rose_node = rose_node->next;
559 if (!t->loopback)
560 rose_remove_node(t);
561 }
562
563 while (rose_neigh != NULL) {
564 s = rose_neigh;
565 rose_neigh = rose_neigh->next;
566
567 if (s->use == 0 && !s->loopback) {
568 s->count = 0;
569 rose_remove_neigh(s);
570 }
571 }
572
573 spin_unlock_bh(&rose_neigh_list_lock);
574 spin_unlock_bh(&rose_node_list_lock);
575
576 return 0;
577 }
578
579 /*
580 * Check that the device given is a valid AX.25 interface that is "up".
581 */
582 static struct net_device *rose_ax25_dev_get(char *devname)
583 {
584 struct net_device *dev;
585
586 if ((dev = dev_get_by_name(&init_net, devname)) == NULL)
587 return NULL;
588
589 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
590 return dev;
591
592 dev_put(dev);
593 return NULL;
594 }
595
596 /*
597 * Find the first active ROSE device, usually "rose0".
598 */
599 struct net_device *rose_dev_first(void)
600 {
601 struct net_device *dev, *first = NULL;
602
603 read_lock(&dev_base_lock);
604 for_each_netdev(&init_net, dev) {
605 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
606 if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
607 first = dev;
608 }
609 read_unlock(&dev_base_lock);
610
611 return first;
612 }
613
614 /*
615 * Find the ROSE device for the given address.
616 */
617 struct net_device *rose_dev_get(rose_address *addr)
618 {
619 struct net_device *dev;
620
621 read_lock(&dev_base_lock);
622 for_each_netdev(&init_net, dev) {
623 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
624 dev_hold(dev);
625 goto out;
626 }
627 }
628 dev = NULL;
629 out:
630 read_unlock(&dev_base_lock);
631 return dev;
632 }
633
634 static int rose_dev_exists(rose_address *addr)
635 {
636 struct net_device *dev;
637
638 read_lock(&dev_base_lock);
639 for_each_netdev(&init_net, dev) {
640 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
641 goto out;
642 }
643 dev = NULL;
644 out:
645 read_unlock(&dev_base_lock);
646 return dev != NULL;
647 }
648
649
650
651
652 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
653 {
654 struct rose_route *rose_route;
655
656 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
657 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
658 (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
659 return rose_route;
660
661 return NULL;
662 }
663
664 /*
665 * Find a neighbour or a route given a ROSE address.
666 */
667 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
668 unsigned char *diagnostic, int new)
669 {
670 struct rose_neigh *res = NULL;
671 struct rose_node *node;
672 int failed = 0;
673 int i;
674
675 if (!new) spin_lock_bh(&rose_node_list_lock);
676 for (node = rose_node_list; node != NULL; node = node->next) {
677 if (rosecmpm(addr, &node->address, node->mask) == 0) {
678 for (i = 0; i < node->count; i++) {
679 if (new) {
680 if (node->neighbour[i]->restarted) {
681 res = node->neighbour[i];
682 goto out;
683 }
684 }
685 else {
686 if (!rose_ftimer_running(node->neighbour[i])) {
687 res = node->neighbour[i];
688 goto out;
689 } else
690 failed = 1;
691 }
692 }
693 }
694 }
695
696 if (failed) {
697 *cause = ROSE_OUT_OF_ORDER;
698 *diagnostic = 0;
699 } else {
700 *cause = ROSE_NOT_OBTAINABLE;
701 *diagnostic = 0;
702 }
703
704 out:
705 if (!new) spin_unlock_bh(&rose_node_list_lock);
706
707 return res;
708 }
709
710 /*
711 * Handle the ioctls that control the routing functions.
712 */
713 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
714 {
715 struct rose_route_struct rose_route;
716 struct net_device *dev;
717 int err;
718
719 switch (cmd) {
720 case SIOCADDRT:
721 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
722 return -EFAULT;
723 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
724 return -EINVAL;
725 if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
726 dev_put(dev);
727 return -EINVAL;
728 }
729 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
730 return -EINVAL;
731 if (rose_route.ndigis > AX25_MAX_DIGIS)
732 return -EINVAL;
733 err = rose_add_node(&rose_route, dev);
734 dev_put(dev);
735 return err;
736
737 case SIOCDELRT:
738 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
739 return -EFAULT;
740 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
741 return -EINVAL;
742 err = rose_del_node(&rose_route, dev);
743 dev_put(dev);
744 return err;
745
746 case SIOCRSCLRRT:
747 return rose_clear_routes();
748
749 default:
750 return -EINVAL;
751 }
752
753 return 0;
754 }
755
756 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
757 {
758 struct rose_route *rose_route, *s;
759
760 rose_neigh->restarted = 0;
761
762 rose_stop_t0timer(rose_neigh);
763 rose_start_ftimer(rose_neigh);
764
765 skb_queue_purge(&rose_neigh->queue);
766
767 spin_lock_bh(&rose_route_list_lock);
768
769 rose_route = rose_route_list;
770
771 while (rose_route != NULL) {
772 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
773 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) ||
774 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
775 s = rose_route->next;
776 rose_remove_route(rose_route);
777 rose_route = s;
778 continue;
779 }
780
781 if (rose_route->neigh1 == rose_neigh) {
782 rose_route->neigh1->use--;
783 rose_route->neigh1 = NULL;
784 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
785 }
786
787 if (rose_route->neigh2 == rose_neigh) {
788 rose_route->neigh2->use--;
789 rose_route->neigh2 = NULL;
790 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
791 }
792
793 rose_route = rose_route->next;
794 }
795 spin_unlock_bh(&rose_route_list_lock);
796 }
797
798 /*
799 * A level 2 link has timed out, therefore it appears to be a poor link,
800 * then don't use that neighbour until it is reset. Blow away all through
801 * routes and connections using this route.
802 */
803 void rose_link_failed(ax25_cb *ax25, int reason)
804 {
805 struct rose_neigh *rose_neigh;
806
807 spin_lock_bh(&rose_neigh_list_lock);
808 rose_neigh = rose_neigh_list;
809 while (rose_neigh != NULL) {
810 if (rose_neigh->ax25 == ax25)
811 break;
812 rose_neigh = rose_neigh->next;
813 }
814
815 if (rose_neigh != NULL) {
816 rose_neigh->ax25 = NULL;
817
818 rose_del_route_by_neigh(rose_neigh);
819 rose_kill_by_neigh(rose_neigh);
820 }
821 spin_unlock_bh(&rose_neigh_list_lock);
822 }
823
824 /*
825 * A device has been "downed" remove its link status. Blow away all
826 * through routes and connections that use this device.
827 */
828 void rose_link_device_down(struct net_device *dev)
829 {
830 struct rose_neigh *rose_neigh;
831
832 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
833 if (rose_neigh->dev == dev) {
834 rose_del_route_by_neigh(rose_neigh);
835 rose_kill_by_neigh(rose_neigh);
836 }
837 }
838 }
839
840 /*
841 * Route a frame to an appropriate AX.25 connection.
842 */
843 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
844 {
845 struct rose_neigh *rose_neigh, *new_neigh;
846 struct rose_route *rose_route;
847 struct rose_facilities_struct facilities;
848 rose_address *src_addr, *dest_addr;
849 struct sock *sk;
850 unsigned short frametype;
851 unsigned int lci, new_lci;
852 unsigned char cause, diagnostic;
853 struct net_device *dev;
854 int len, res = 0;
855 char buf[11];
856
857 #if 0
858 if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
859 return res;
860 #endif
861
862 frametype = skb->data[2];
863 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
864 src_addr = (rose_address *)(skb->data + 9);
865 dest_addr = (rose_address *)(skb->data + 4);
866
867 spin_lock_bh(&rose_neigh_list_lock);
868 spin_lock_bh(&rose_route_list_lock);
869
870 rose_neigh = rose_neigh_list;
871 while (rose_neigh != NULL) {
872 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
873 ax25->ax25_dev->dev == rose_neigh->dev)
874 break;
875 rose_neigh = rose_neigh->next;
876 }
877
878 if (rose_neigh == NULL) {
879 printk("rose_route : unknown neighbour or device %s\n",
880 ax2asc(buf, &ax25->dest_addr));
881 goto out;
882 }
883
884 /*
885 * Obviously the link is working, halt the ftimer.
886 */
887 rose_stop_ftimer(rose_neigh);
888
889 /*
890 * LCI of zero is always for us, and its always a restart
891 * frame.
892 */
893 if (lci == 0) {
894 rose_link_rx_restart(skb, rose_neigh, frametype);
895 goto out;
896 }
897
898 /*
899 * Find an existing socket.
900 */
901 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
902 if (frametype == ROSE_CALL_REQUEST) {
903 struct rose_sock *rose = rose_sk(sk);
904
905 /* Remove an existing unused socket */
906 rose_clear_queues(sk);
907 rose->cause = ROSE_NETWORK_CONGESTION;
908 rose->diagnostic = 0;
909 rose->neighbour->use--;
910 rose->neighbour = NULL;
911 rose->lci = 0;
912 rose->state = ROSE_STATE_0;
913 sk->sk_state = TCP_CLOSE;
914 sk->sk_err = 0;
915 sk->sk_shutdown |= SEND_SHUTDOWN;
916 if (!sock_flag(sk, SOCK_DEAD)) {
917 sk->sk_state_change(sk);
918 sock_set_flag(sk, SOCK_DEAD);
919 }
920 }
921 else {
922 skb_reset_transport_header(skb);
923 res = rose_process_rx_frame(sk, skb);
924 goto out;
925 }
926 }
927
928 /*
929 * Is is a Call Request and is it for us ?
930 */
931 if (frametype == ROSE_CALL_REQUEST)
932 if ((dev = rose_dev_get(dest_addr)) != NULL) {
933 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
934 dev_put(dev);
935 goto out;
936 }
937
938 if (!sysctl_rose_routing_control) {
939 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
940 goto out;
941 }
942
943 /*
944 * Route it to the next in line if we have an entry for it.
945 */
946 rose_route = rose_route_list;
947 while (rose_route != NULL) {
948 if (rose_route->lci1 == lci &&
949 rose_route->neigh1 == rose_neigh) {
950 if (frametype == ROSE_CALL_REQUEST) {
951 /* F6FBB - Remove an existing unused route */
952 rose_remove_route(rose_route);
953 break;
954 } else if (rose_route->neigh2 != NULL) {
955 skb->data[0] &= 0xF0;
956 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
957 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
958 rose_transmit_link(skb, rose_route->neigh2);
959 if (frametype == ROSE_CLEAR_CONFIRMATION)
960 rose_remove_route(rose_route);
961 res = 1;
962 goto out;
963 } else {
964 if (frametype == ROSE_CLEAR_CONFIRMATION)
965 rose_remove_route(rose_route);
966 goto out;
967 }
968 }
969 if (rose_route->lci2 == lci &&
970 rose_route->neigh2 == rose_neigh) {
971 if (frametype == ROSE_CALL_REQUEST) {
972 /* F6FBB - Remove an existing unused route */
973 rose_remove_route(rose_route);
974 break;
975 } else if (rose_route->neigh1 != NULL) {
976 skb->data[0] &= 0xF0;
977 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
978 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
979 rose_transmit_link(skb, rose_route->neigh1);
980 if (frametype == ROSE_CLEAR_CONFIRMATION)
981 rose_remove_route(rose_route);
982 res = 1;
983 goto out;
984 } else {
985 if (frametype == ROSE_CLEAR_CONFIRMATION)
986 rose_remove_route(rose_route);
987 goto out;
988 }
989 }
990 rose_route = rose_route->next;
991 }
992
993 /*
994 * We know that:
995 * 1. The frame isn't for us,
996 * 2. It isn't "owned" by any existing route.
997 */
998 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
999 res = 0;
1000 goto out;
1001 }
1002
1003 len = (((skb->data[3] >> 4) & 0x0F) + 1) >> 1;
1004 len += (((skb->data[3] >> 0) & 0x0F) + 1) >> 1;
1005
1006 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1007
1008 if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
1009 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1010 goto out;
1011 }
1012
1013 /*
1014 * Check for routing loops.
1015 */
1016 rose_route = rose_route_list;
1017 while (rose_route != NULL) {
1018 if (rose_route->rand == facilities.rand &&
1019 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1020 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1021 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1022 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1023 goto out;
1024 }
1025 rose_route = rose_route->next;
1026 }
1027
1028 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) {
1029 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1030 goto out;
1031 }
1032
1033 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1034 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1035 goto out;
1036 }
1037
1038 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1039 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1040 goto out;
1041 }
1042
1043 rose_route->lci1 = lci;
1044 rose_route->src_addr = *src_addr;
1045 rose_route->dest_addr = *dest_addr;
1046 rose_route->src_call = facilities.dest_call;
1047 rose_route->dest_call = facilities.source_call;
1048 rose_route->rand = facilities.rand;
1049 rose_route->neigh1 = rose_neigh;
1050 rose_route->lci2 = new_lci;
1051 rose_route->neigh2 = new_neigh;
1052
1053 rose_route->neigh1->use++;
1054 rose_route->neigh2->use++;
1055
1056 rose_route->next = rose_route_list;
1057 rose_route_list = rose_route;
1058
1059 skb->data[0] &= 0xF0;
1060 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1061 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1062
1063 rose_transmit_link(skb, rose_route->neigh2);
1064 res = 1;
1065
1066 out:
1067 spin_unlock_bh(&rose_route_list_lock);
1068 spin_unlock_bh(&rose_neigh_list_lock);
1069
1070 return res;
1071 }
1072
1073 #ifdef CONFIG_PROC_FS
1074
1075 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1076 __acquires(rose_node_list_lock)
1077 {
1078 struct rose_node *rose_node;
1079 int i = 1;
1080
1081 spin_lock_bh(&rose_node_list_lock);
1082 if (*pos == 0)
1083 return SEQ_START_TOKEN;
1084
1085 for (rose_node = rose_node_list; rose_node && i < *pos;
1086 rose_node = rose_node->next, ++i);
1087
1088 return (i == *pos) ? rose_node : NULL;
1089 }
1090
1091 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1092 {
1093 ++*pos;
1094
1095 return (v == SEQ_START_TOKEN) ? rose_node_list
1096 : ((struct rose_node *)v)->next;
1097 }
1098
1099 static void rose_node_stop(struct seq_file *seq, void *v)
1100 __releases(rose_node_list_lock)
1101 {
1102 spin_unlock_bh(&rose_node_list_lock);
1103 }
1104
1105 static int rose_node_show(struct seq_file *seq, void *v)
1106 {
1107 char rsbuf[11];
1108 int i;
1109
1110 if (v == SEQ_START_TOKEN)
1111 seq_puts(seq, "address mask n neigh neigh neigh\n");
1112 else {
1113 const struct rose_node *rose_node = v;
1114 /* if (rose_node->loopback) {
1115 seq_printf(seq, "%-10s %04d 1 loopback\n",
1116 rose2asc(rsbuf, &rose_node->address),
1117 rose_node->mask);
1118 } else { */
1119 seq_printf(seq, "%-10s %04d %d",
1120 rose2asc(rsbuf, &rose_node->address),
1121 rose_node->mask,
1122 rose_node->count);
1123
1124 for (i = 0; i < rose_node->count; i++)
1125 seq_printf(seq, " %05d",
1126 rose_node->neighbour[i]->number);
1127
1128 seq_puts(seq, "\n");
1129 /* } */
1130 }
1131 return 0;
1132 }
1133
1134 static const struct seq_operations rose_node_seqops = {
1135 .start = rose_node_start,
1136 .next = rose_node_next,
1137 .stop = rose_node_stop,
1138 .show = rose_node_show,
1139 };
1140
1141 static int rose_nodes_open(struct inode *inode, struct file *file)
1142 {
1143 return seq_open(file, &rose_node_seqops);
1144 }
1145
1146 const struct file_operations rose_nodes_fops = {
1147 .owner = THIS_MODULE,
1148 .open = rose_nodes_open,
1149 .read = seq_read,
1150 .llseek = seq_lseek,
1151 .release = seq_release,
1152 };
1153
1154 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1155 __acquires(rose_neigh_list_lock)
1156 {
1157 struct rose_neigh *rose_neigh;
1158 int i = 1;
1159
1160 spin_lock_bh(&rose_neigh_list_lock);
1161 if (*pos == 0)
1162 return SEQ_START_TOKEN;
1163
1164 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1165 rose_neigh = rose_neigh->next, ++i);
1166
1167 return (i == *pos) ? rose_neigh : NULL;
1168 }
1169
1170 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1171 {
1172 ++*pos;
1173
1174 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1175 : ((struct rose_neigh *)v)->next;
1176 }
1177
1178 static void rose_neigh_stop(struct seq_file *seq, void *v)
1179 __releases(rose_neigh_list_lock)
1180 {
1181 spin_unlock_bh(&rose_neigh_list_lock);
1182 }
1183
1184 static int rose_neigh_show(struct seq_file *seq, void *v)
1185 {
1186 char buf[11];
1187 int i;
1188
1189 if (v == SEQ_START_TOKEN)
1190 seq_puts(seq,
1191 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1192 else {
1193 struct rose_neigh *rose_neigh = v;
1194
1195 /* if (!rose_neigh->loopback) { */
1196 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1197 rose_neigh->number,
1198 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1199 rose_neigh->dev ? rose_neigh->dev->name : "???",
1200 rose_neigh->count,
1201 rose_neigh->use,
1202 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1203 (rose_neigh->restarted) ? "yes" : "no",
1204 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1205 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1206
1207 if (rose_neigh->digipeat != NULL) {
1208 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1209 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1210 }
1211
1212 seq_puts(seq, "\n");
1213 }
1214 return 0;
1215 }
1216
1217
1218 static const struct seq_operations rose_neigh_seqops = {
1219 .start = rose_neigh_start,
1220 .next = rose_neigh_next,
1221 .stop = rose_neigh_stop,
1222 .show = rose_neigh_show,
1223 };
1224
1225 static int rose_neigh_open(struct inode *inode, struct file *file)
1226 {
1227 return seq_open(file, &rose_neigh_seqops);
1228 }
1229
1230 const struct file_operations rose_neigh_fops = {
1231 .owner = THIS_MODULE,
1232 .open = rose_neigh_open,
1233 .read = seq_read,
1234 .llseek = seq_lseek,
1235 .release = seq_release,
1236 };
1237
1238
1239 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1240 __acquires(rose_route_list_lock)
1241 {
1242 struct rose_route *rose_route;
1243 int i = 1;
1244
1245 spin_lock_bh(&rose_route_list_lock);
1246 if (*pos == 0)
1247 return SEQ_START_TOKEN;
1248
1249 for (rose_route = rose_route_list; rose_route && i < *pos;
1250 rose_route = rose_route->next, ++i);
1251
1252 return (i == *pos) ? rose_route : NULL;
1253 }
1254
1255 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1256 {
1257 ++*pos;
1258
1259 return (v == SEQ_START_TOKEN) ? rose_route_list
1260 : ((struct rose_route *)v)->next;
1261 }
1262
1263 static void rose_route_stop(struct seq_file *seq, void *v)
1264 __releases(rose_route_list_lock)
1265 {
1266 spin_unlock_bh(&rose_route_list_lock);
1267 }
1268
1269 static int rose_route_show(struct seq_file *seq, void *v)
1270 {
1271 char buf[11], rsbuf[11];
1272
1273 if (v == SEQ_START_TOKEN)
1274 seq_puts(seq,
1275 "lci address callsign neigh <-> lci address callsign neigh\n");
1276 else {
1277 struct rose_route *rose_route = v;
1278
1279 if (rose_route->neigh1)
1280 seq_printf(seq,
1281 "%3.3X %-10s %-9s %05d ",
1282 rose_route->lci1,
1283 rose2asc(rsbuf, &rose_route->src_addr),
1284 ax2asc(buf, &rose_route->src_call),
1285 rose_route->neigh1->number);
1286 else
1287 seq_puts(seq,
1288 "000 * * 00000 ");
1289
1290 if (rose_route->neigh2)
1291 seq_printf(seq,
1292 "%3.3X %-10s %-9s %05d\n",
1293 rose_route->lci2,
1294 rose2asc(rsbuf, &rose_route->dest_addr),
1295 ax2asc(buf, &rose_route->dest_call),
1296 rose_route->neigh2->number);
1297 else
1298 seq_puts(seq,
1299 "000 * * 00000\n");
1300 }
1301 return 0;
1302 }
1303
1304 static const struct seq_operations rose_route_seqops = {
1305 .start = rose_route_start,
1306 .next = rose_route_next,
1307 .stop = rose_route_stop,
1308 .show = rose_route_show,
1309 };
1310
1311 static int rose_route_open(struct inode *inode, struct file *file)
1312 {
1313 return seq_open(file, &rose_route_seqops);
1314 }
1315
1316 const struct file_operations rose_routes_fops = {
1317 .owner = THIS_MODULE,
1318 .open = rose_route_open,
1319 .read = seq_read,
1320 .llseek = seq_lseek,
1321 .release = seq_release,
1322 };
1323
1324 #endif /* CONFIG_PROC_FS */
1325
1326 /*
1327 * Release all memory associated with ROSE routing structures.
1328 */
1329 void __exit rose_rt_free(void)
1330 {
1331 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1332 struct rose_node *t, *rose_node = rose_node_list;
1333 struct rose_route *u, *rose_route = rose_route_list;
1334
1335 while (rose_neigh != NULL) {
1336 s = rose_neigh;
1337 rose_neigh = rose_neigh->next;
1338
1339 rose_remove_neigh(s);
1340 }
1341
1342 while (rose_node != NULL) {
1343 t = rose_node;
1344 rose_node = rose_node->next;
1345
1346 rose_remove_node(t);
1347 }
1348
1349 while (rose_route != NULL) {
1350 u = rose_route;
1351 rose_route = rose_route->next;
1352
1353 rose_remove_route(u);
1354 }
1355 }
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