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ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / net / rose / rose_route.c
blob479cae57d1873a97c2f97a6865c873cb12218e37
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/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,
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
196 out:
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 */
206 static 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 */
230 static 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 */
265 static 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 */
296 static 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
362 out:
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 */
372 void 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 */
406 int 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
442 out:
443 spin_unlock_bh(&rose_node_list_lock);
444
445 return err;
446 }
447
448 /*
449 * Delete a loopback node.
450 */
451 void 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
473 out:
474 spin_unlock_bh(&rose_node_list_lock);
475 }
476
477 /*
478 * A device has been removed. Remove its routes and neighbours.
479 */
480 void 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 */
532 void 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 */
554 static 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 */
592 static 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 */
608 struct 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 */
626 struct 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;
638 out:
639 rcu_read_unlock();
640 return dev;
641 }
642
643 static 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;
653 out:
654 rcu_read_unlock();
655 return dev != NULL;
656 }
657
658
659
660
661 struct 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 */
676 struct 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
718 out:
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 */
726 int 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
765 static 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 */
812 void 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 */
838 void 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 */
853 int 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 0
868 if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
869 return res;
870 #endif
871
872 if (skb->len < ROSE_MIN_LEN)
873 return res;
874 frametype = skb->data[2];
875 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
876 if (frametype == ROSE_CALL_REQUEST &&
877 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
878 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
879 ROSE_CALL_REQ_ADDR_LEN_VAL))
880 return res;
881 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF);
882 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
883
884 spin_lock_bh(&rose_neigh_list_lock);
885 spin_lock_bh(&rose_route_list_lock);
886
887 rose_neigh = rose_neigh_list;
888 while (rose_neigh != NULL) {
889 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
890 ax25->ax25_dev->dev == rose_neigh->dev)
891 break;
892 rose_neigh = rose_neigh->next;
893 }
894
895 if (rose_neigh == NULL) {
896 printk("rose_route : unknown neighbour or device %s\n",
897 ax2asc(buf, &ax25->dest_addr));
898 goto out;
899 }
900
901 /*
902 * Obviously the link is working, halt the ftimer.
903 */
904 rose_stop_ftimer(rose_neigh);
905
906 /*
907 * LCI of zero is always for us, and its always a restart
908 * frame.
909 */
910 if (lci == 0) {
911 rose_link_rx_restart(skb, rose_neigh, frametype);
912 goto out;
913 }
914
915 /*
916 * Find an existing socket.
917 */
918 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
919 if (frametype == ROSE_CALL_REQUEST) {
920 struct rose_sock *rose = rose_sk(sk);
921
922 /* Remove an existing unused socket */
923 rose_clear_queues(sk);
924 rose->cause = ROSE_NETWORK_CONGESTION;
925 rose->diagnostic = 0;
926 rose->neighbour->use--;
927 rose->neighbour = NULL;
928 rose->lci = 0;
929 rose->state = ROSE_STATE_0;
930 sk->sk_state = TCP_CLOSE;
931 sk->sk_err = 0;
932 sk->sk_shutdown |= SEND_SHUTDOWN;
933 if (!sock_flag(sk, SOCK_DEAD)) {
934 sk->sk_state_change(sk);
935 sock_set_flag(sk, SOCK_DEAD);
936 }
937 }
938 else {
939 skb_reset_transport_header(skb);
940 res = rose_process_rx_frame(sk, skb);
941 goto out;
942 }
943 }
944
945 /*
946 * Is is a Call Request and is it for us ?
947 */
948 if (frametype == ROSE_CALL_REQUEST)
949 if ((dev = rose_dev_get(dest_addr)) != NULL) {
950 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
951 dev_put(dev);
952 goto out;
953 }
954
955 if (!sysctl_rose_routing_control) {
956 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
957 goto out;
958 }
959
960 /*
961 * Route it to the next in line if we have an entry for it.
962 */
963 rose_route = rose_route_list;
964 while (rose_route != NULL) {
965 if (rose_route->lci1 == lci &&
966 rose_route->neigh1 == rose_neigh) {
967 if (frametype == ROSE_CALL_REQUEST) {
968 /* F6FBB - Remove an existing unused route */
969 rose_remove_route(rose_route);
970 break;
971 } else if (rose_route->neigh2 != NULL) {
972 skb->data[0] &= 0xF0;
973 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
974 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
975 rose_transmit_link(skb, rose_route->neigh2);
976 if (frametype == ROSE_CLEAR_CONFIRMATION)
977 rose_remove_route(rose_route);
978 res = 1;
979 goto out;
980 } else {
981 if (frametype == ROSE_CLEAR_CONFIRMATION)
982 rose_remove_route(rose_route);
983 goto out;
984 }
985 }
986 if (rose_route->lci2 == lci &&
987 rose_route->neigh2 == rose_neigh) {
988 if (frametype == ROSE_CALL_REQUEST) {
989 /* F6FBB - Remove an existing unused route */
990 rose_remove_route(rose_route);
991 break;
992 } else if (rose_route->neigh1 != NULL) {
993 skb->data[0] &= 0xF0;
994 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
995 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
996 rose_transmit_link(skb, rose_route->neigh1);
997 if (frametype == ROSE_CLEAR_CONFIRMATION)
998 rose_remove_route(rose_route);
999 res = 1;
1000 goto out;
1001 } else {
1002 if (frametype == ROSE_CLEAR_CONFIRMATION)
1003 rose_remove_route(rose_route);
1004 goto out;
1005 }
1006 }
1007 rose_route = rose_route->next;
1008 }
1009
1010 /*
1011 * We know that:
1012 * 1. The frame isn't for us,
1013 * 2. It isn't "owned" by any existing route.
1014 */
1015 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
1016 res = 0;
1017 goto out;
1018 }
1019
1020 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1021
1022 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF,
1023 skb->len - ROSE_CALL_REQ_FACILITIES_OFF,
1024 &facilities)) {
1025 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1026 goto out;
1027 }
1028
1029 /*
1030 * Check for routing loops.
1031 */
1032 rose_route = rose_route_list;
1033 while (rose_route != NULL) {
1034 if (rose_route->rand == facilities.rand &&
1035 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1036 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1037 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1038 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1039 goto out;
1040 }
1041 rose_route = rose_route->next;
1042 }
1043
1044 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) {
1045 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1046 goto out;
1047 }
1048
1049 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1050 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1051 goto out;
1052 }
1053
1054 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1055 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1056 goto out;
1057 }
1058
1059 rose_route->lci1 = lci;
1060 rose_route->src_addr = *src_addr;
1061 rose_route->dest_addr = *dest_addr;
1062 rose_route->src_call = facilities.dest_call;
1063 rose_route->dest_call = facilities.source_call;
1064 rose_route->rand = facilities.rand;
1065 rose_route->neigh1 = rose_neigh;
1066 rose_route->lci2 = new_lci;
1067 rose_route->neigh2 = new_neigh;
1068
1069 rose_route->neigh1->use++;
1070 rose_route->neigh2->use++;
1071
1072 rose_route->next = rose_route_list;
1073 rose_route_list = rose_route;
1074
1075 skb->data[0] &= 0xF0;
1076 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1077 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1078
1079 rose_transmit_link(skb, rose_route->neigh2);
1080 res = 1;
1081
1082 out:
1083 spin_unlock_bh(&rose_route_list_lock);
1084 spin_unlock_bh(&rose_neigh_list_lock);
1085
1086 return res;
1087 }
1088
1089 #ifdef CONFIG_PROC_FS
1090
1091 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1092 __acquires(rose_node_list_lock)
1093 {
1094 struct rose_node *rose_node;
1095 int i = 1;
1096
1097 spin_lock_bh(&rose_node_list_lock);
1098 if (*pos == 0)
1099 return SEQ_START_TOKEN;
1100
1101 for (rose_node = rose_node_list; rose_node && i < *pos;
1102 rose_node = rose_node->next, ++i);
1103
1104 return (i == *pos) ? rose_node : NULL;
1105 }
1106
1107 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1108 {
1109 ++*pos;
1110
1111 return (v == SEQ_START_TOKEN) ? rose_node_list
1112 : ((struct rose_node *)v)->next;
1113 }
1114
1115 static void rose_node_stop(struct seq_file *seq, void *v)
1116 __releases(rose_node_list_lock)
1117 {
1118 spin_unlock_bh(&rose_node_list_lock);
1119 }
1120
1121 static int rose_node_show(struct seq_file *seq, void *v)
1122 {
1123 char rsbuf[11];
1124 int i;
1125
1126 if (v == SEQ_START_TOKEN)
1127 seq_puts(seq, "address mask n neigh neigh neigh\n");
1128 else {
1129 const struct rose_node *rose_node = v;
1130 /* if (rose_node->loopback) {
1131 seq_printf(seq, "%-10s %04d 1 loopback\n",
1132 rose2asc(rsbuf, &rose_node->address),
1133 rose_node->mask);
1134 } else { */
1135 seq_printf(seq, "%-10s %04d %d",
1136 rose2asc(rsbuf, &rose_node->address),
1137 rose_node->mask,
1138 rose_node->count);
1139
1140 for (i = 0; i < rose_node->count; i++)
1141 seq_printf(seq, " %05d",
1142 rose_node->neighbour[i]->number);
1143
1144 seq_puts(seq, "\n");
1145 /* } */
1146 }
1147 return 0;
1148 }
1149
1150 static const struct seq_operations rose_node_seqops = {
1151 .start = rose_node_start,
1152 .next = rose_node_next,
1153 .stop = rose_node_stop,
1154 .show = rose_node_show,
1155 };
1156
1157 static int rose_nodes_open(struct inode *inode, struct file *file)
1158 {
1159 return seq_open(file, &rose_node_seqops);
1160 }
1161
1162 const struct file_operations rose_nodes_fops = {
1163 .owner = THIS_MODULE,
1164 .open = rose_nodes_open,
1165 .read = seq_read,
1166 .llseek = seq_lseek,
1167 .release = seq_release,
1168 };
1169
1170 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1171 __acquires(rose_neigh_list_lock)
1172 {
1173 struct rose_neigh *rose_neigh;
1174 int i = 1;
1175
1176 spin_lock_bh(&rose_neigh_list_lock);
1177 if (*pos == 0)
1178 return SEQ_START_TOKEN;
1179
1180 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1181 rose_neigh = rose_neigh->next, ++i);
1182
1183 return (i == *pos) ? rose_neigh : NULL;
1184 }
1185
1186 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1187 {
1188 ++*pos;
1189
1190 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1191 : ((struct rose_neigh *)v)->next;
1192 }
1193
1194 static void rose_neigh_stop(struct seq_file *seq, void *v)
1195 __releases(rose_neigh_list_lock)
1196 {
1197 spin_unlock_bh(&rose_neigh_list_lock);
1198 }
1199
1200 static int rose_neigh_show(struct seq_file *seq, void *v)
1201 {
1202 char buf[11];
1203 int i;
1204
1205 if (v == SEQ_START_TOKEN)
1206 seq_puts(seq,
1207 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1208 else {
1209 struct rose_neigh *rose_neigh = v;
1210
1211 /* if (!rose_neigh->loopback) { */
1212 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1213 rose_neigh->number,
1214 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1215 rose_neigh->dev ? rose_neigh->dev->name : "???",
1216 rose_neigh->count,
1217 rose_neigh->use,
1218 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1219 (rose_neigh->restarted) ? "yes" : "no",
1220 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1221 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1222
1223 if (rose_neigh->digipeat != NULL) {
1224 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1225 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1226 }
1227
1228 seq_puts(seq, "\n");
1229 }
1230 return 0;
1231 }
1232
1233
1234 static const struct seq_operations rose_neigh_seqops = {
1235 .start = rose_neigh_start,
1236 .next = rose_neigh_next,
1237 .stop = rose_neigh_stop,
1238 .show = rose_neigh_show,
1239 };
1240
1241 static int rose_neigh_open(struct inode *inode, struct file *file)
1242 {
1243 return seq_open(file, &rose_neigh_seqops);
1244 }
1245
1246 const struct file_operations rose_neigh_fops = {
1247 .owner = THIS_MODULE,
1248 .open = rose_neigh_open,
1249 .read = seq_read,
1250 .llseek = seq_lseek,
1251 .release = seq_release,
1252 };
1253
1254
1255 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1256 __acquires(rose_route_list_lock)
1257 {
1258 struct rose_route *rose_route;
1259 int i = 1;
1260
1261 spin_lock_bh(&rose_route_list_lock);
1262 if (*pos == 0)
1263 return SEQ_START_TOKEN;
1264
1265 for (rose_route = rose_route_list; rose_route && i < *pos;
1266 rose_route = rose_route->next, ++i);
1267
1268 return (i == *pos) ? rose_route : NULL;
1269 }
1270
1271 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1272 {
1273 ++*pos;
1274
1275 return (v == SEQ_START_TOKEN) ? rose_route_list
1276 : ((struct rose_route *)v)->next;
1277 }
1278
1279 static void rose_route_stop(struct seq_file *seq, void *v)
1280 __releases(rose_route_list_lock)
1281 {
1282 spin_unlock_bh(&rose_route_list_lock);
1283 }
1284
1285 static int rose_route_show(struct seq_file *seq, void *v)
1286 {
1287 char buf[11], rsbuf[11];
1288
1289 if (v == SEQ_START_TOKEN)
1290 seq_puts(seq,
1291 "lci address callsign neigh <-> lci address callsign neigh\n");
1292 else {
1293 struct rose_route *rose_route = v;
1294
1295 if (rose_route->neigh1)
1296 seq_printf(seq,
1297 "%3.3X %-10s %-9s %05d ",
1298 rose_route->lci1,
1299 rose2asc(rsbuf, &rose_route->src_addr),
1300 ax2asc(buf, &rose_route->src_call),
1301 rose_route->neigh1->number);
1302 else
1303 seq_puts(seq,
1304 "000 * * 00000 ");
1305
1306 if (rose_route->neigh2)
1307 seq_printf(seq,
1308 "%3.3X %-10s %-9s %05d\n",
1309 rose_route->lci2,
1310 rose2asc(rsbuf, &rose_route->dest_addr),
1311 ax2asc(buf, &rose_route->dest_call),
1312 rose_route->neigh2->number);
1313 else
1314 seq_puts(seq,
1315 "000 * * 00000\n");
1316 }
1317 return 0;
1318 }
1319
1320 static const struct seq_operations rose_route_seqops = {
1321 .start = rose_route_start,
1322 .next = rose_route_next,
1323 .stop = rose_route_stop,
1324 .show = rose_route_show,
1325 };
1326
1327 static int rose_route_open(struct inode *inode, struct file *file)
1328 {
1329 return seq_open(file, &rose_route_seqops);
1330 }
1331
1332 const struct file_operations rose_routes_fops = {
1333 .owner = THIS_MODULE,
1334 .open = rose_route_open,
1335 .read = seq_read,
1336 .llseek = seq_lseek,
1337 .release = seq_release,
1338 };
1339
1340 #endif /* CONFIG_PROC_FS */
1341
1342 /*
1343 * Release all memory associated with ROSE routing structures.
1344 */
1345 void __exit rose_rt_free(void)
1346 {
1347 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1348 struct rose_node *t, *rose_node = rose_node_list;
1349 struct rose_route *u, *rose_route = rose_route_list;
1350
1351 while (rose_neigh != NULL) {
1352 s = rose_neigh;
1353 rose_neigh = rose_neigh->next;
1354
1355 rose_remove_neigh(s);
1356 }
1357
1358 while (rose_node != NULL) {
1359 t = rose_node;
1360 rose_node = rose_node->next;
1361
1362 rose_remove_node(t);
1363 }
1364
1365 while (rose_route != NULL) {
1366 u = rose_route;
1367 rose_route = rose_route->next;
1368
1369 rose_remove_route(u);
1370 }
1371 }
Linux with added FPC-III support