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b44: Fix frequent link changes
[linux-2.6.22.y-op.git] / net / rose / rose_route.c
blob8028c0d425dc51992ef55e7dc95d66e3397cf700
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/sched.h>
16 #include <linux/timer.h>
17 #include <linux/string.h>
18 #include <linux/sockios.h>
19 #include <linux/net.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/system.h>
29 #include <asm/uaccess.h>
30 #include <linux/fcntl.h>
31 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
32 #include <linux/mm.h>
33 #include <linux/interrupt.h>
34 #include <linux/notifier.h>
35 #include <linux/netfilter.h>
36 #include <linux/init.h>
37 #include <net/rose.h>
38 #include <linux/seq_file.h>
39
40 static unsigned int rose_neigh_no = 1;
41
42 static struct rose_node *rose_node_list;
43 static DEFINE_SPINLOCK(rose_node_list_lock);
44 static struct rose_neigh *rose_neigh_list;
45 static DEFINE_SPINLOCK(rose_neigh_list_lock);
46 static struct rose_route *rose_route_list;
47 static DEFINE_SPINLOCK(rose_route_list_lock);
48
49 struct 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 */
55 static 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, &rose_neigh->callsign) == 0
82 && rose_neigh->dev == dev)
83 break;
84 rose_neigh = rose_neigh->next;
85 }
86
87 if (rose_neigh == NULL) {
88 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
89 if (rose_neigh == NULL) {
90 res = -ENOMEM;
91 goto out;
92 }
93
94 rose_neigh->callsign = rose_route->neighbour;
95 rose_neigh->digipeat = NULL;
96 rose_neigh->ax25 = NULL;
97 rose_neigh->dev = dev;
98 rose_neigh->count = 0;
99 rose_neigh->use = 0;
100 rose_neigh->dce_mode = 0;
101 rose_neigh->loopback = 0;
102 rose_neigh->number = rose_neigh_no++;
103 rose_neigh->restarted = 0;
104
105 skb_queue_head_init(&rose_neigh->queue);
106
107 init_timer(&rose_neigh->ftimer);
108 init_timer(&rose_neigh->t0timer);
109
110 if (rose_route->ndigis != 0) {
111 if ((rose_neigh->digipeat = kmalloc(sizeof(ax25_digi), GFP_KERNEL)) == NULL) {
112 kfree(rose_neigh);
113 res = -ENOMEM;
114 goto out;
115 }
116
117 rose_neigh->digipeat->ndigi = rose_route->ndigis;
118 rose_neigh->digipeat->lastrepeat = -1;
119
120 for (i = 0; i < rose_route->ndigis; i++) {
121 rose_neigh->digipeat->calls[i] =
122 rose_route->digipeaters[i];
123 rose_neigh->digipeat->repeated[i] = 0;
124 }
125 }
126
127 rose_neigh->next = rose_neigh_list;
128 rose_neigh_list = rose_neigh;
129 }
130
131 /*
132 * This is a new node to be inserted into the list. Find where it needs
133 * to be inserted into the list, and insert it. We want to be sure
134 * to order the list in descending order of mask size to ensure that
135 * later when we are searching this list the first match will be the
136 * best match.
137 */
138 if (rose_node == NULL) {
139 rose_tmpn = rose_node_list;
140 rose_tmpp = NULL;
141
142 while (rose_tmpn != NULL) {
143 if (rose_tmpn->mask > rose_route->mask) {
144 rose_tmpp = rose_tmpn;
145 rose_tmpn = rose_tmpn->next;
146 } else {
147 break;
148 }
149 }
150
151 /* create new node */
152 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
153 if (rose_node == NULL) {
154 res = -ENOMEM;
155 goto out;
156 }
157
158 rose_node->address = rose_route->address;
159 rose_node->mask = rose_route->mask;
160 rose_node->count = 1;
161 rose_node->loopback = 0;
162 rose_node->neighbour[0] = rose_neigh;
163
164 if (rose_tmpn == NULL) {
165 if (rose_tmpp == NULL) { /* Empty list */
166 rose_node_list = rose_node;
167 rose_node->next = NULL;
168 } else {
169 rose_tmpp->next = rose_node;
170 rose_node->next = NULL;
171 }
172 } else {
173 if (rose_tmpp == NULL) { /* 1st node */
174 rose_node->next = rose_node_list;
175 rose_node_list = rose_node;
176 } else {
177 rose_tmpp->next = rose_node;
178 rose_node->next = rose_tmpn;
179 }
180 }
181 rose_neigh->count++;
182
183 goto out;
184 }
185
186 /* We have space, slot it in */
187 if (rose_node->count < 3) {
188 rose_node->neighbour[rose_node->count] = rose_neigh;
189 rose_node->count++;
190 rose_neigh->count++;
191 }
192
193 out:
194 spin_unlock_bh(&rose_neigh_list_lock);
195 spin_unlock_bh(&rose_node_list_lock);
196
197 return res;
198 }
199
200 /*
201 * Caller is holding rose_node_list_lock.
202 */
203 static void rose_remove_node(struct rose_node *rose_node)
204 {
205 struct rose_node *s;
206
207 if ((s = rose_node_list) == rose_node) {
208 rose_node_list = rose_node->next;
209 kfree(rose_node);
210 return;
211 }
212
213 while (s != NULL && s->next != NULL) {
214 if (s->next == rose_node) {
215 s->next = rose_node->next;
216 kfree(rose_node);
217 return;
218 }
219
220 s = s->next;
221 }
222 }
223
224 /*
225 * Caller is holding rose_neigh_list_lock.
226 */
227 static void rose_remove_neigh(struct rose_neigh *rose_neigh)
228 {
229 struct rose_neigh *s;
230
231 rose_stop_ftimer(rose_neigh);
232 rose_stop_t0timer(rose_neigh);
233
234 skb_queue_purge(&rose_neigh->queue);
235
236 if ((s = rose_neigh_list) == rose_neigh) {
237 rose_neigh_list = rose_neigh->next;
238 kfree(rose_neigh->digipeat);
239 kfree(rose_neigh);
240 return;
241 }
242
243 while (s != NULL && s->next != NULL) {
244 if (s->next == rose_neigh) {
245 s->next = rose_neigh->next;
246 kfree(rose_neigh->digipeat);
247 kfree(rose_neigh);
248 return;
249 }
250
251 s = s->next;
252 }
253 }
254
255 /*
256 * Caller is holding rose_route_list_lock.
257 */
258 static void rose_remove_route(struct rose_route *rose_route)
259 {
260 struct rose_route *s;
261
262 if (rose_route->neigh1 != NULL)
263 rose_route->neigh1->use--;
264
265 if (rose_route->neigh2 != NULL)
266 rose_route->neigh2->use--;
267
268 if ((s = rose_route_list) == rose_route) {
269 rose_route_list = rose_route->next;
270 kfree(rose_route);
271 return;
272 }
273
274 while (s != NULL && s->next != NULL) {
275 if (s->next == rose_route) {
276 s->next = rose_route->next;
277 kfree(rose_route);
278 return;
279 }
280
281 s = s->next;
282 }
283 }
284
285 /*
286 * "Delete" a node. Strictly speaking remove a route to a node. The node
287 * is only deleted if no routes are left to it.
288 */
289 static int rose_del_node(struct rose_route_struct *rose_route,
290 struct net_device *dev)
291 {
292 struct rose_node *rose_node;
293 struct rose_neigh *rose_neigh;
294 int i, err = 0;
295
296 spin_lock_bh(&rose_node_list_lock);
297 spin_lock_bh(&rose_neigh_list_lock);
298
299 rose_node = rose_node_list;
300 while (rose_node != NULL) {
301 if ((rose_node->mask == rose_route->mask) &&
302 (rosecmpm(&rose_route->address, &rose_node->address,
303 rose_route->mask) == 0))
304 break;
305 rose_node = rose_node->next;
306 }
307
308 if (rose_node == NULL || rose_node->loopback) {
309 err = -EINVAL;
310 goto out;
311 }
312
313 rose_neigh = rose_neigh_list;
314 while (rose_neigh != NULL) {
315 if (ax25cmp(&rose_route->neighbour, &rose_neigh->callsign) == 0
316 && rose_neigh->dev == dev)
317 break;
318 rose_neigh = rose_neigh->next;
319 }
320
321 if (rose_neigh == NULL) {
322 err = -EINVAL;
323 goto out;
324 }
325
326 for (i = 0; i < rose_node->count; i++) {
327 if (rose_node->neighbour[i] == rose_neigh) {
328 rose_neigh->count--;
329
330 if (rose_neigh->count == 0 && rose_neigh->use == 0)
331 rose_remove_neigh(rose_neigh);
332
333 rose_node->count--;
334
335 if (rose_node->count == 0) {
336 rose_remove_node(rose_node);
337 } else {
338 switch (i) {
339 case 0:
340 rose_node->neighbour[0] =
341 rose_node->neighbour[1];
342 case 1:
343 rose_node->neighbour[1] =
344 rose_node->neighbour[2];
345 case 2:
346 break;
347 }
348 }
349 goto out;
350 }
351 }
352 err = -EINVAL;
353
354 out:
355 spin_unlock_bh(&rose_neigh_list_lock);
356 spin_unlock_bh(&rose_node_list_lock);
357
358 return err;
359 }
360
361 /*
362 * Add the loopback neighbour.
363 */
364 void rose_add_loopback_neigh(void)
365 {
366 struct rose_neigh *sn = &rose_loopback_neigh;
367
368 sn->callsign = null_ax25_address;
369 sn->digipeat = NULL;
370 sn->ax25 = NULL;
371 sn->dev = NULL;
372 sn->count = 0;
373 sn->use = 0;
374 sn->dce_mode = 1;
375 sn->loopback = 1;
376 sn->number = rose_neigh_no++;
377 sn->restarted = 1;
378
379 skb_queue_head_init(&sn->queue);
380
381 init_timer(&sn->ftimer);
382 init_timer(&sn->t0timer);
383
384 spin_lock_bh(&rose_neigh_list_lock);
385 sn->next = rose_neigh_list;
386 rose_neigh_list = sn;
387 spin_unlock_bh(&rose_neigh_list_lock);
388 }
389
390 /*
391 * Add a loopback node.
392 */
393 int rose_add_loopback_node(rose_address *address)
394 {
395 struct rose_node *rose_node;
396 int err = 0;
397
398 spin_lock_bh(&rose_node_list_lock);
399
400 rose_node = rose_node_list;
401 while (rose_node != NULL) {
402 if ((rose_node->mask == 10) &&
403 (rosecmpm(address, &rose_node->address, 10) == 0) &&
404 rose_node->loopback)
405 break;
406 rose_node = rose_node->next;
407 }
408
409 if (rose_node != NULL)
410 goto out;
411
412 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
413 err = -ENOMEM;
414 goto out;
415 }
416
417 rose_node->address = *address;
418 rose_node->mask = 10;
419 rose_node->count = 1;
420 rose_node->loopback = 1;
421 rose_node->neighbour[0] = &rose_loopback_neigh;
422
423 /* Insert at the head of list. Address is always mask=10 */
424 rose_node->next = rose_node_list;
425 rose_node_list = rose_node;
426
427 rose_loopback_neigh.count++;
428
429 out:
430 spin_unlock_bh(&rose_node_list_lock);
431
432 return err;
433 }
434
435 /*
436 * Delete a loopback node.
437 */
438 void rose_del_loopback_node(rose_address *address)
439 {
440 struct rose_node *rose_node;
441
442 spin_lock_bh(&rose_node_list_lock);
443
444 rose_node = rose_node_list;
445 while (rose_node != NULL) {
446 if ((rose_node->mask == 10) &&
447 (rosecmpm(address, &rose_node->address, 10) == 0) &&
448 rose_node->loopback)
449 break;
450 rose_node = rose_node->next;
451 }
452
453 if (rose_node == NULL)
454 goto out;
455
456 rose_remove_node(rose_node);
457
458 rose_loopback_neigh.count--;
459
460 out:
461 spin_unlock_bh(&rose_node_list_lock);
462 }
463
464 /*
465 * A device has been removed. Remove its routes and neighbours.
466 */
467 void rose_rt_device_down(struct net_device *dev)
468 {
469 struct rose_neigh *s, *rose_neigh;
470 struct rose_node *t, *rose_node;
471 int i;
472
473 spin_lock_bh(&rose_node_list_lock);
474 spin_lock_bh(&rose_neigh_list_lock);
475 rose_neigh = rose_neigh_list;
476 while (rose_neigh != NULL) {
477 s = rose_neigh;
478 rose_neigh = rose_neigh->next;
479
480 if (s->dev != dev)
481 continue;
482
483 rose_node = rose_node_list;
484
485 while (rose_node != NULL) {
486 t = rose_node;
487 rose_node = rose_node->next;
488
489 for (i = 0; i < t->count; i++) {
490 if (t->neighbour[i] != s)
491 continue;
492
493 t->count--;
494
495 switch (i) {
496 case 0:
497 t->neighbour[0] = t->neighbour[1];
498 case 1:
499 t->neighbour[1] = t->neighbour[2];
500 case 2:
501 break;
502 }
503 }
504
505 if (t->count <= 0)
506 rose_remove_node(t);
507 }
508
509 rose_remove_neigh(s);
510 }
511 spin_unlock_bh(&rose_neigh_list_lock);
512 spin_unlock_bh(&rose_node_list_lock);
513 }
514
515 #if 0 /* Currently unused */
516 /*
517 * A device has been removed. Remove its links.
518 */
519 void rose_route_device_down(struct net_device *dev)
520 {
521 struct rose_route *s, *rose_route;
522
523 spin_lock_bh(&rose_route_list_lock);
524 rose_route = rose_route_list;
525 while (rose_route != NULL) {
526 s = rose_route;
527 rose_route = rose_route->next;
528
529 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
530 rose_remove_route(s);
531 }
532 spin_unlock_bh(&rose_route_list_lock);
533 }
534 #endif
535
536 /*
537 * Clear all nodes and neighbours out, except for neighbours with
538 * active connections going through them.
539 * Do not clear loopback neighbour and nodes.
540 */
541 static int rose_clear_routes(void)
542 {
543 struct rose_neigh *s, *rose_neigh;
544 struct rose_node *t, *rose_node;
545
546 spin_lock_bh(&rose_node_list_lock);
547 spin_lock_bh(&rose_neigh_list_lock);
548
549 rose_neigh = rose_neigh_list;
550 rose_node = rose_node_list;
551
552 while (rose_node != NULL) {
553 t = rose_node;
554 rose_node = rose_node->next;
555 if (!t->loopback)
556 rose_remove_node(t);
557 }
558
559 while (rose_neigh != NULL) {
560 s = rose_neigh;
561 rose_neigh = rose_neigh->next;
562
563 if (s->use == 0 && !s->loopback) {
564 s->count = 0;
565 rose_remove_neigh(s);
566 }
567 }
568
569 spin_unlock_bh(&rose_neigh_list_lock);
570 spin_unlock_bh(&rose_node_list_lock);
571
572 return 0;
573 }
574
575 /*
576 * Check that the device given is a valid AX.25 interface that is "up".
577 */
578 static struct net_device *rose_ax25_dev_get(char *devname)
579 {
580 struct net_device *dev;
581
582 if ((dev = dev_get_by_name(devname)) == NULL)
583 return NULL;
584
585 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
586 return dev;
587
588 dev_put(dev);
589 return NULL;
590 }
591
592 /*
593 * Find the first active ROSE device, usually "rose0".
594 */
595 struct net_device *rose_dev_first(void)
596 {
597 struct net_device *dev, *first = NULL;
598
599 read_lock(&dev_base_lock);
600 for (dev = dev_base; dev != NULL; dev = dev->next) {
601 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
602 if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
603 first = dev;
604 }
605 read_unlock(&dev_base_lock);
606
607 return first;
608 }
609
610 /*
611 * Find the ROSE device for the given address.
612 */
613 struct net_device *rose_dev_get(rose_address *addr)
614 {
615 struct net_device *dev;
616
617 read_lock(&dev_base_lock);
618 for (dev = dev_base; dev != NULL; dev = dev->next) {
619 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
620 dev_hold(dev);
621 goto out;
622 }
623 }
624 out:
625 read_unlock(&dev_base_lock);
626 return dev;
627 }
628
629 static int rose_dev_exists(rose_address *addr)
630 {
631 struct net_device *dev;
632
633 read_lock(&dev_base_lock);
634 for (dev = dev_base; dev != NULL; dev = dev->next) {
635 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
636 goto out;
637 }
638 out:
639 read_unlock(&dev_base_lock);
640 return dev != NULL;
641 }
642
643
644
645
646 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
647 {
648 struct rose_route *rose_route;
649
650 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
651 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
652 (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
653 return rose_route;
654
655 return NULL;
656 }
657
658 /*
659 * Find a neighbour given a ROSE address.
660 */
661 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
662 unsigned char *diagnostic)
663 {
664 struct rose_neigh *res = NULL;
665 struct rose_node *node;
666 int failed = 0;
667 int i;
668
669 spin_lock_bh(&rose_node_list_lock);
670 for (node = rose_node_list; node != NULL; node = node->next) {
671 if (rosecmpm(addr, &node->address, node->mask) == 0) {
672 for (i = 0; i < node->count; i++) {
673 if (!rose_ftimer_running(node->neighbour[i])) {
674 res = node->neighbour[i];
675 goto out;
676 } else
677 failed = 1;
678 }
679 break;
680 }
681 }
682
683 if (failed) {
684 *cause = ROSE_OUT_OF_ORDER;
685 *diagnostic = 0;
686 } else {
687 *cause = ROSE_NOT_OBTAINABLE;
688 *diagnostic = 0;
689 }
690
691 out:
692 spin_unlock_bh(&rose_node_list_lock);
693
694 return res;
695 }
696
697 /*
698 * Handle the ioctls that control the routing functions.
699 */
700 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
701 {
702 struct rose_route_struct rose_route;
703 struct net_device *dev;
704 int err;
705
706 switch (cmd) {
707 case SIOCADDRT:
708 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
709 return -EFAULT;
710 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
711 return -EINVAL;
712 if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
713 dev_put(dev);
714 return -EINVAL;
715 }
716 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
717 return -EINVAL;
718 if (rose_route.ndigis > AX25_MAX_DIGIS)
719 return -EINVAL;
720 err = rose_add_node(&rose_route, dev);
721 dev_put(dev);
722 return err;
723
724 case SIOCDELRT:
725 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
726 return -EFAULT;
727 if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
728 return -EINVAL;
729 err = rose_del_node(&rose_route, dev);
730 dev_put(dev);
731 return err;
732
733 case SIOCRSCLRRT:
734 return rose_clear_routes();
735
736 default:
737 return -EINVAL;
738 }
739
740 return 0;
741 }
742
743 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
744 {
745 struct rose_route *rose_route, *s;
746
747 rose_neigh->restarted = 0;
748
749 rose_stop_t0timer(rose_neigh);
750 rose_start_ftimer(rose_neigh);
751
752 skb_queue_purge(&rose_neigh->queue);
753
754 spin_lock_bh(&rose_route_list_lock);
755
756 rose_route = rose_route_list;
757
758 while (rose_route != NULL) {
759 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
760 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) ||
761 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
762 s = rose_route->next;
763 rose_remove_route(rose_route);
764 rose_route = s;
765 continue;
766 }
767
768 if (rose_route->neigh1 == rose_neigh) {
769 rose_route->neigh1->use--;
770 rose_route->neigh1 = NULL;
771 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
772 }
773
774 if (rose_route->neigh2 == rose_neigh) {
775 rose_route->neigh2->use--;
776 rose_route->neigh2 = NULL;
777 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
778 }
779
780 rose_route = rose_route->next;
781 }
782 spin_unlock_bh(&rose_route_list_lock);
783 }
784
785 /*
786 * A level 2 link has timed out, therefore it appears to be a poor link,
787 * then don't use that neighbour until it is reset. Blow away all through
788 * routes and connections using this route.
789 */
790 void rose_link_failed(ax25_cb *ax25, int reason)
791 {
792 struct rose_neigh *rose_neigh;
793
794 spin_lock_bh(&rose_neigh_list_lock);
795 rose_neigh = rose_neigh_list;
796 while (rose_neigh != NULL) {
797 if (rose_neigh->ax25 == ax25)
798 break;
799 rose_neigh = rose_neigh->next;
800 }
801
802 if (rose_neigh != NULL) {
803 rose_neigh->ax25 = NULL;
804
805 rose_del_route_by_neigh(rose_neigh);
806 rose_kill_by_neigh(rose_neigh);
807 }
808 spin_unlock_bh(&rose_neigh_list_lock);
809 }
810
811 /*
812 * A device has been "downed" remove its link status. Blow away all
813 * through routes and connections that use this device.
814 */
815 void rose_link_device_down(struct net_device *dev)
816 {
817 struct rose_neigh *rose_neigh;
818
819 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
820 if (rose_neigh->dev == dev) {
821 rose_del_route_by_neigh(rose_neigh);
822 rose_kill_by_neigh(rose_neigh);
823 }
824 }
825 }
826
827 /*
828 * Route a frame to an appropriate AX.25 connection.
829 */
830 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
831 {
832 struct rose_neigh *rose_neigh, *new_neigh;
833 struct rose_route *rose_route;
834 struct rose_facilities_struct facilities;
835 rose_address *src_addr, *dest_addr;
836 struct sock *sk;
837 unsigned short frametype;
838 unsigned int lci, new_lci;
839 unsigned char cause, diagnostic;
840 struct net_device *dev;
841 int len, res = 0;
842 char buf[11];
843
844 #if 0
845 if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
846 return res;
847 #endif
848
849 frametype = skb->data[2];
850 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
851 src_addr = (rose_address *)(skb->data + 9);
852 dest_addr = (rose_address *)(skb->data + 4);
853
854 spin_lock_bh(&rose_node_list_lock);
855 spin_lock_bh(&rose_neigh_list_lock);
856 spin_lock_bh(&rose_route_list_lock);
857
858 rose_neigh = rose_neigh_list;
859 while (rose_neigh != NULL) {
860 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
861 ax25->ax25_dev->dev == rose_neigh->dev)
862 break;
863 rose_neigh = rose_neigh->next;
864 }
865
866 if (rose_neigh == NULL) {
867 printk("rose_route : unknown neighbour or device %s\n",
868 ax2asc(buf, &ax25->dest_addr));
869 goto out;
870 }
871
872 /*
873 * Obviously the link is working, halt the ftimer.
874 */
875 rose_stop_ftimer(rose_neigh);
876
877 /*
878 * LCI of zero is always for us, and its always a restart
879 * frame.
880 */
881 if (lci == 0) {
882 rose_link_rx_restart(skb, rose_neigh, frametype);
883 goto out;
884 }
885
886 /*
887 * Find an existing socket.
888 */
889 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
890 if (frametype == ROSE_CALL_REQUEST) {
891 struct rose_sock *rose = rose_sk(sk);
892
893 /* Remove an existing unused socket */
894 rose_clear_queues(sk);
895 rose->cause = ROSE_NETWORK_CONGESTION;
896 rose->diagnostic = 0;
897 rose->neighbour->use--;
898 rose->neighbour = NULL;
899 rose->lci = 0;
900 rose->state = ROSE_STATE_0;
901 sk->sk_state = TCP_CLOSE;
902 sk->sk_err = 0;
903 sk->sk_shutdown |= SEND_SHUTDOWN;
904 if (!sock_flag(sk, SOCK_DEAD)) {
905 sk->sk_state_change(sk);
906 sock_set_flag(sk, SOCK_DEAD);
907 }
908 }
909 else {
910 skb->h.raw = skb->data;
911 res = rose_process_rx_frame(sk, skb);
912 goto out;
913 }
914 }
915
916 /*
917 * Is is a Call Request and is it for us ?
918 */
919 if (frametype == ROSE_CALL_REQUEST)
920 if ((dev = rose_dev_get(dest_addr)) != NULL) {
921 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
922 dev_put(dev);
923 goto out;
924 }
925
926 if (!sysctl_rose_routing_control) {
927 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
928 goto out;
929 }
930
931 /*
932 * Route it to the next in line if we have an entry for it.
933 */
934 rose_route = rose_route_list;
935 while (rose_route != NULL) {
936 if (rose_route->lci1 == lci &&
937 rose_route->neigh1 == rose_neigh) {
938 if (frametype == ROSE_CALL_REQUEST) {
939 /* F6FBB - Remove an existing unused route */
940 rose_remove_route(rose_route);
941 break;
942 } else if (rose_route->neigh2 != NULL) {
943 skb->data[0] &= 0xF0;
944 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
945 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
946 rose_transmit_link(skb, rose_route->neigh2);
947 if (frametype == ROSE_CLEAR_CONFIRMATION)
948 rose_remove_route(rose_route);
949 res = 1;
950 goto out;
951 } else {
952 if (frametype == ROSE_CLEAR_CONFIRMATION)
953 rose_remove_route(rose_route);
954 goto out;
955 }
956 }
957 if (rose_route->lci2 == lci &&
958 rose_route->neigh2 == rose_neigh) {
959 if (frametype == ROSE_CALL_REQUEST) {
960 /* F6FBB - Remove an existing unused route */
961 rose_remove_route(rose_route);
962 break;
963 } else if (rose_route->neigh1 != NULL) {
964 skb->data[0] &= 0xF0;
965 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
966 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
967 rose_transmit_link(skb, rose_route->neigh1);
968 if (frametype == ROSE_CLEAR_CONFIRMATION)
969 rose_remove_route(rose_route);
970 res = 1;
971 goto out;
972 } else {
973 if (frametype == ROSE_CLEAR_CONFIRMATION)
974 rose_remove_route(rose_route);
975 goto out;
976 }
977 }
978 rose_route = rose_route->next;
979 }
980
981 /*
982 * We know that:
983 * 1. The frame isn't for us,
984 * 2. It isn't "owned" by any existing route.
985 */
986 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
987 res = 0;
988 goto out;
989 }
990
991 len = (((skb->data[3] >> 4) & 0x0F) + 1) / 2;
992 len += (((skb->data[3] >> 0) & 0x0F) + 1) / 2;
993
994 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
995
996 if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
997 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
998 goto out;
999 }
1000
1001 /*
1002 * Check for routing loops.
1003 */
1004 rose_route = rose_route_list;
1005 while (rose_route != NULL) {
1006 if (rose_route->rand == facilities.rand &&
1007 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1008 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1009 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1010 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1011 goto out;
1012 }
1013 rose_route = rose_route->next;
1014 }
1015
1016 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic)) == NULL) {
1017 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1018 goto out;
1019 }
1020
1021 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1022 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1023 goto out;
1024 }
1025
1026 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1027 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1028 goto out;
1029 }
1030
1031 rose_route->lci1 = lci;
1032 rose_route->src_addr = *src_addr;
1033 rose_route->dest_addr = *dest_addr;
1034 rose_route->src_call = facilities.dest_call;
1035 rose_route->dest_call = facilities.source_call;
1036 rose_route->rand = facilities.rand;
1037 rose_route->neigh1 = rose_neigh;
1038 rose_route->lci2 = new_lci;
1039 rose_route->neigh2 = new_neigh;
1040
1041 rose_route->neigh1->use++;
1042 rose_route->neigh2->use++;
1043
1044 rose_route->next = rose_route_list;
1045 rose_route_list = rose_route;
1046
1047 skb->data[0] &= 0xF0;
1048 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1049 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1050
1051 rose_transmit_link(skb, rose_route->neigh2);
1052 res = 1;
1053
1054 out:
1055 spin_unlock_bh(&rose_route_list_lock);
1056 spin_unlock_bh(&rose_neigh_list_lock);
1057 spin_unlock_bh(&rose_node_list_lock);
1058
1059 return res;
1060 }
1061
1062 #ifdef CONFIG_PROC_FS
1063
1064 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1065 {
1066 struct rose_node *rose_node;
1067 int i = 1;
1068
1069 spin_lock_bh(&rose_neigh_list_lock);
1070 if (*pos == 0)
1071 return SEQ_START_TOKEN;
1072
1073 for (rose_node = rose_node_list; rose_node && i < *pos;
1074 rose_node = rose_node->next, ++i);
1075
1076 return (i == *pos) ? rose_node : NULL;
1077 }
1078
1079 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1080 {
1081 ++*pos;
1082
1083 return (v == SEQ_START_TOKEN) ? rose_node_list
1084 : ((struct rose_node *)v)->next;
1085 }
1086
1087 static void rose_node_stop(struct seq_file *seq, void *v)
1088 {
1089 spin_unlock_bh(&rose_neigh_list_lock);
1090 }
1091
1092 static int rose_node_show(struct seq_file *seq, void *v)
1093 {
1094 int i;
1095
1096 if (v == SEQ_START_TOKEN)
1097 seq_puts(seq, "address mask n neigh neigh neigh\n");
1098 else {
1099 const struct rose_node *rose_node = v;
1100 /* if (rose_node->loopback) {
1101 seq_printf(seq, "%-10s %04d 1 loopback\n",
1102 rose2asc(&rose_node->address),
1103 rose_node->mask);
1104 } else { */
1105 seq_printf(seq, "%-10s %04d %d",
1106 rose2asc(&rose_node->address),
1107 rose_node->mask,
1108 rose_node->count);
1109
1110 for (i = 0; i < rose_node->count; i++)
1111 seq_printf(seq, " %05d",
1112 rose_node->neighbour[i]->number);
1113
1114 seq_puts(seq, "\n");
1115 /* } */
1116 }
1117 return 0;
1118 }
1119
1120 static struct seq_operations rose_node_seqops = {
1121 .start = rose_node_start,
1122 .next = rose_node_next,
1123 .stop = rose_node_stop,
1124 .show = rose_node_show,
1125 };
1126
1127 static int rose_nodes_open(struct inode *inode, struct file *file)
1128 {
1129 return seq_open(file, &rose_node_seqops);
1130 }
1131
1132 struct file_operations rose_nodes_fops = {
1133 .owner = THIS_MODULE,
1134 .open = rose_nodes_open,
1135 .read = seq_read,
1136 .llseek = seq_lseek,
1137 .release = seq_release,
1138 };
1139
1140 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1141 {
1142 struct rose_neigh *rose_neigh;
1143 int i = 1;
1144
1145 spin_lock_bh(&rose_neigh_list_lock);
1146 if (*pos == 0)
1147 return SEQ_START_TOKEN;
1148
1149 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1150 rose_neigh = rose_neigh->next, ++i);
1151
1152 return (i == *pos) ? rose_neigh : NULL;
1153 }
1154
1155 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1156 {
1157 ++*pos;
1158
1159 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1160 : ((struct rose_neigh *)v)->next;
1161 }
1162
1163 static void rose_neigh_stop(struct seq_file *seq, void *v)
1164 {
1165 spin_unlock_bh(&rose_neigh_list_lock);
1166 }
1167
1168 static int rose_neigh_show(struct seq_file *seq, void *v)
1169 {
1170 char buf[11];
1171 int i;
1172
1173 if (v == SEQ_START_TOKEN)
1174 seq_puts(seq,
1175 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1176 else {
1177 struct rose_neigh *rose_neigh = v;
1178
1179 /* if (!rose_neigh->loopback) { */
1180 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1181 rose_neigh->number,
1182 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1183 rose_neigh->dev ? rose_neigh->dev->name : "???",
1184 rose_neigh->count,
1185 rose_neigh->use,
1186 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1187 (rose_neigh->restarted) ? "yes" : "no",
1188 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1189 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1190
1191 if (rose_neigh->digipeat != NULL) {
1192 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1193 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1194 }
1195
1196 seq_puts(seq, "\n");
1197 }
1198 return 0;
1199 }
1200
1201
1202 static struct seq_operations rose_neigh_seqops = {
1203 .start = rose_neigh_start,
1204 .next = rose_neigh_next,
1205 .stop = rose_neigh_stop,
1206 .show = rose_neigh_show,
1207 };
1208
1209 static int rose_neigh_open(struct inode *inode, struct file *file)
1210 {
1211 return seq_open(file, &rose_neigh_seqops);
1212 }
1213
1214 struct file_operations rose_neigh_fops = {
1215 .owner = THIS_MODULE,
1216 .open = rose_neigh_open,
1217 .read = seq_read,
1218 .llseek = seq_lseek,
1219 .release = seq_release,
1220 };
1221
1222
1223 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1224 {
1225 struct rose_route *rose_route;
1226 int i = 1;
1227
1228 spin_lock_bh(&rose_route_list_lock);
1229 if (*pos == 0)
1230 return SEQ_START_TOKEN;
1231
1232 for (rose_route = rose_route_list; rose_route && i < *pos;
1233 rose_route = rose_route->next, ++i);
1234
1235 return (i == *pos) ? rose_route : NULL;
1236 }
1237
1238 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1239 {
1240 ++*pos;
1241
1242 return (v == SEQ_START_TOKEN) ? rose_route_list
1243 : ((struct rose_route *)v)->next;
1244 }
1245
1246 static void rose_route_stop(struct seq_file *seq, void *v)
1247 {
1248 spin_unlock_bh(&rose_route_list_lock);
1249 }
1250
1251 static int rose_route_show(struct seq_file *seq, void *v)
1252 {
1253 char buf[11];
1254
1255 if (v == SEQ_START_TOKEN)
1256 seq_puts(seq,
1257 "lci address callsign neigh <-> lci address callsign neigh\n");
1258 else {
1259 struct rose_route *rose_route = v;
1260
1261 if (rose_route->neigh1)
1262 seq_printf(seq,
1263 "%3.3X %-10s %-9s %05d ",
1264 rose_route->lci1,
1265 rose2asc(&rose_route->src_addr),
1266 ax2asc(buf, &rose_route->src_call),
1267 rose_route->neigh1->number);
1268 else
1269 seq_puts(seq,
1270 "000 * * 00000 ");
1271
1272 if (rose_route->neigh2)
1273 seq_printf(seq,
1274 "%3.3X %-10s %-9s %05d\n",
1275 rose_route->lci2,
1276 rose2asc(&rose_route->dest_addr),
1277 ax2asc(buf, &rose_route->dest_call),
1278 rose_route->neigh2->number);
1279 else
1280 seq_puts(seq,
1281 "000 * * 00000\n");
1282 }
1283 return 0;
1284 }
1285
1286 static struct seq_operations rose_route_seqops = {
1287 .start = rose_route_start,
1288 .next = rose_route_next,
1289 .stop = rose_route_stop,
1290 .show = rose_route_show,
1291 };
1292
1293 static int rose_route_open(struct inode *inode, struct file *file)
1294 {
1295 return seq_open(file, &rose_route_seqops);
1296 }
1297
1298 struct file_operations rose_routes_fops = {
1299 .owner = THIS_MODULE,
1300 .open = rose_route_open,
1301 .read = seq_read,
1302 .llseek = seq_lseek,
1303 .release = seq_release,
1304 };
1305
1306 #endif /* CONFIG_PROC_FS */
1307
1308 /*
1309 * Release all memory associated with ROSE routing structures.
1310 */
1311 void __exit rose_rt_free(void)
1312 {
1313 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1314 struct rose_node *t, *rose_node = rose_node_list;
1315 struct rose_route *u, *rose_route = rose_route_list;
1316
1317 while (rose_neigh != NULL) {
1318 s = rose_neigh;
1319 rose_neigh = rose_neigh->next;
1320
1321 rose_remove_neigh(s);
1322 }
1323
1324 while (rose_node != NULL) {
1325 t = rose_node;
1326 rose_node = rose_node->next;
1327
1328 rose_remove_node(t);
1329 }
1330
1331 while (rose_route != NULL) {
1332 u = rose_route;
1333 rose_route = rose_route->next;
1334
1335 rose_remove_route(u);
1336 }
1337 }
linux v2.6.22.y-op