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Partial revert "Basic kernel memory functionality for the Memory Controller"
[linux-2.6/libata-dev.git] / net / rose / rose_route.c
blobcd9b7ee60f3e6937a3c6193423c4a274f171136b
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 #include <linux/export.h>
40
41 static unsigned int rose_neigh_no = 1;
42
43 static struct rose_node *rose_node_list;
44 static DEFINE_SPINLOCK(rose_node_list_lock);
45 static struct rose_neigh *rose_neigh_list;
46 static DEFINE_SPINLOCK(rose_neigh_list_lock);
47 static struct rose_route *rose_route_list;
48 static DEFINE_SPINLOCK(rose_route_list_lock);
49
50 struct rose_neigh *rose_loopback_neigh;
51
52 /*
53 * Add a new route to a node, and in the process add the node and the
54 * neighbour if it is new.
55 */
56 static int __must_check rose_add_node(struct rose_route_struct *rose_route,
57 struct net_device *dev)
58 {
59 struct rose_node *rose_node, *rose_tmpn, *rose_tmpp;
60 struct rose_neigh *rose_neigh;
61 int i, res = 0;
62
63 spin_lock_bh(&rose_node_list_lock);
64 spin_lock_bh(&rose_neigh_list_lock);
65
66 rose_node = rose_node_list;
67 while (rose_node != NULL) {
68 if ((rose_node->mask == rose_route->mask) &&
69 (rosecmpm(&rose_route->address, &rose_node->address,
70 rose_route->mask) == 0))
71 break;
72 rose_node = rose_node->next;
73 }
74
75 if (rose_node != NULL && rose_node->loopback) {
76 res = -EINVAL;
77 goto out;
78 }
79
80 rose_neigh = rose_neigh_list;
81 while (rose_neigh != NULL) {
82 if (ax25cmp(&rose_route->neighbour,
83 &rose_neigh->callsign) == 0 &&
84 rose_neigh->dev == dev)
85 break;
86 rose_neigh = rose_neigh->next;
87 }
88
89 if (rose_neigh == NULL) {
90 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
91 if (rose_neigh == NULL) {
92 res = -ENOMEM;
93 goto out;
94 }
95
96 rose_neigh->callsign = rose_route->neighbour;
97 rose_neigh->digipeat = NULL;
98 rose_neigh->ax25 = NULL;
99 rose_neigh->dev = dev;
100 rose_neigh->count = 0;
101 rose_neigh->use = 0;
102 rose_neigh->dce_mode = 0;
103 rose_neigh->loopback = 0;
104 rose_neigh->number = rose_neigh_no++;
105 rose_neigh->restarted = 0;
106
107 skb_queue_head_init(&rose_neigh->queue);
108
109 init_timer(&rose_neigh->ftimer);
110 init_timer(&rose_neigh->t0timer);
111
112 if (rose_route->ndigis != 0) {
113 rose_neigh->digipeat =
114 kmalloc(sizeof(ax25_digi), GFP_ATOMIC);
115 if (rose_neigh->digipeat == NULL) {
116 kfree(rose_neigh);
117 res = -ENOMEM;
118 goto out;
119 }
120
121 rose_neigh->digipeat->ndigi = rose_route->ndigis;
122 rose_neigh->digipeat->lastrepeat = -1;
123
124 for (i = 0; i < rose_route->ndigis; i++) {
125 rose_neigh->digipeat->calls[i] =
126 rose_route->digipeaters[i];
127 rose_neigh->digipeat->repeated[i] = 0;
128 }
129 }
130
131 rose_neigh->next = rose_neigh_list;
132 rose_neigh_list = rose_neigh;
133 }
134
135 /*
136 * This is a new node to be inserted into the list. Find where it needs
137 * to be inserted into the list, and insert it. We want to be sure
138 * to order the list in descending order of mask size to ensure that
139 * later when we are searching this list the first match will be the
140 * best match.
141 */
142 if (rose_node == NULL) {
143 rose_tmpn = rose_node_list;
144 rose_tmpp = NULL;
145
146 while (rose_tmpn != NULL) {
147 if (rose_tmpn->mask > rose_route->mask) {
148 rose_tmpp = rose_tmpn;
149 rose_tmpn = rose_tmpn->next;
150 } else {
151 break;
152 }
153 }
154
155 /* create new node */
156 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
157 if (rose_node == NULL) {
158 res = -ENOMEM;
159 goto out;
160 }
161
162 rose_node->address = rose_route->address;
163 rose_node->mask = rose_route->mask;
164 rose_node->count = 1;
165 rose_node->loopback = 0;
166 rose_node->neighbour[0] = rose_neigh;
167
168 if (rose_tmpn == NULL) {
169 if (rose_tmpp == NULL) { /* Empty list */
170 rose_node_list = rose_node;
171 rose_node->next = NULL;
172 } else {
173 rose_tmpp->next = rose_node;
174 rose_node->next = NULL;
175 }
176 } else {
177 if (rose_tmpp == NULL) { /* 1st node */
178 rose_node->next = rose_node_list;
179 rose_node_list = rose_node;
180 } else {
181 rose_tmpp->next = rose_node;
182 rose_node->next = rose_tmpn;
183 }
184 }
185 rose_neigh->count++;
186
187 goto out;
188 }
189
190 /* We have space, slot it in */
191 if (rose_node->count < 3) {
192 rose_node->neighbour[rose_node->count] = rose_neigh;
193 rose_node->count++;
194 rose_neigh->count++;
195 }
196
197 out:
198 spin_unlock_bh(&rose_neigh_list_lock);
199 spin_unlock_bh(&rose_node_list_lock);
200
201 return res;
202 }
203
204 /*
205 * Caller is holding rose_node_list_lock.
206 */
207 static void rose_remove_node(struct rose_node *rose_node)
208 {
209 struct rose_node *s;
210
211 if ((s = rose_node_list) == rose_node) {
212 rose_node_list = rose_node->next;
213 kfree(rose_node);
214 return;
215 }
216
217 while (s != NULL && s->next != NULL) {
218 if (s->next == rose_node) {
219 s->next = rose_node->next;
220 kfree(rose_node);
221 return;
222 }
223
224 s = s->next;
225 }
226 }
227
228 /*
229 * Caller is holding rose_neigh_list_lock.
230 */
231 static void rose_remove_neigh(struct rose_neigh *rose_neigh)
232 {
233 struct rose_neigh *s;
234
235 rose_stop_ftimer(rose_neigh);
236 rose_stop_t0timer(rose_neigh);
237
238 skb_queue_purge(&rose_neigh->queue);
239
240 if ((s = rose_neigh_list) == rose_neigh) {
241 rose_neigh_list = rose_neigh->next;
242 if (rose_neigh->ax25)
243 ax25_cb_put(rose_neigh->ax25);
244 kfree(rose_neigh->digipeat);
245 kfree(rose_neigh);
246 return;
247 }
248
249 while (s != NULL && s->next != NULL) {
250 if (s->next == rose_neigh) {
251 s->next = rose_neigh->next;
252 if (rose_neigh->ax25)
253 ax25_cb_put(rose_neigh->ax25);
254 kfree(rose_neigh->digipeat);
255 kfree(rose_neigh);
256 return;
257 }
258
259 s = s->next;
260 }
261 }
262
263 /*
264 * Caller is holding rose_route_list_lock.
265 */
266 static void rose_remove_route(struct rose_route *rose_route)
267 {
268 struct rose_route *s;
269
270 if (rose_route->neigh1 != NULL)
271 rose_route->neigh1->use--;
272
273 if (rose_route->neigh2 != NULL)
274 rose_route->neigh2->use--;
275
276 if ((s = rose_route_list) == rose_route) {
277 rose_route_list = rose_route->next;
278 kfree(rose_route);
279 return;
280 }
281
282 while (s != NULL && s->next != NULL) {
283 if (s->next == rose_route) {
284 s->next = rose_route->next;
285 kfree(rose_route);
286 return;
287 }
288
289 s = s->next;
290 }
291 }
292
293 /*
294 * "Delete" a node. Strictly speaking remove a route to a node. The node
295 * is only deleted if no routes are left to it.
296 */
297 static int rose_del_node(struct rose_route_struct *rose_route,
298 struct net_device *dev)
299 {
300 struct rose_node *rose_node;
301 struct rose_neigh *rose_neigh;
302 int i, err = 0;
303
304 spin_lock_bh(&rose_node_list_lock);
305 spin_lock_bh(&rose_neigh_list_lock);
306
307 rose_node = rose_node_list;
308 while (rose_node != NULL) {
309 if ((rose_node->mask == rose_route->mask) &&
310 (rosecmpm(&rose_route->address, &rose_node->address,
311 rose_route->mask) == 0))
312 break;
313 rose_node = rose_node->next;
314 }
315
316 if (rose_node == NULL || rose_node->loopback) {
317 err = -EINVAL;
318 goto out;
319 }
320
321 rose_neigh = rose_neigh_list;
322 while (rose_neigh != NULL) {
323 if (ax25cmp(&rose_route->neighbour,
324 &rose_neigh->callsign) == 0 &&
325 rose_neigh->dev == dev)
326 break;
327 rose_neigh = rose_neigh->next;
328 }
329
330 if (rose_neigh == NULL) {
331 err = -EINVAL;
332 goto out;
333 }
334
335 for (i = 0; i < rose_node->count; i++) {
336 if (rose_node->neighbour[i] == rose_neigh) {
337 rose_neigh->count--;
338
339 if (rose_neigh->count == 0 && rose_neigh->use == 0)
340 rose_remove_neigh(rose_neigh);
341
342 rose_node->count--;
343
344 if (rose_node->count == 0) {
345 rose_remove_node(rose_node);
346 } else {
347 switch (i) {
348 case 0:
349 rose_node->neighbour[0] =
350 rose_node->neighbour[1];
351 case 1:
352 rose_node->neighbour[1] =
353 rose_node->neighbour[2];
354 case 2:
355 break;
356 }
357 }
358 goto out;
359 }
360 }
361 err = -EINVAL;
362
363 out:
364 spin_unlock_bh(&rose_neigh_list_lock);
365 spin_unlock_bh(&rose_node_list_lock);
366
367 return err;
368 }
369
370 /*
371 * Add the loopback neighbour.
372 */
373 void rose_add_loopback_neigh(void)
374 {
375 struct rose_neigh *sn;
376
377 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL);
378 if (!rose_loopback_neigh)
379 return;
380 sn = rose_loopback_neigh;
381
382 sn->callsign = null_ax25_address;
383 sn->digipeat = NULL;
384 sn->ax25 = NULL;
385 sn->dev = NULL;
386 sn->count = 0;
387 sn->use = 0;
388 sn->dce_mode = 1;
389 sn->loopback = 1;
390 sn->number = rose_neigh_no++;
391 sn->restarted = 1;
392
393 skb_queue_head_init(&sn->queue);
394
395 init_timer(&sn->ftimer);
396 init_timer(&sn->t0timer);
397
398 spin_lock_bh(&rose_neigh_list_lock);
399 sn->next = rose_neigh_list;
400 rose_neigh_list = sn;
401 spin_unlock_bh(&rose_neigh_list_lock);
402 }
403
404 /*
405 * Add a loopback node.
406 */
407 int rose_add_loopback_node(rose_address *address)
408 {
409 struct rose_node *rose_node;
410 int err = 0;
411
412 spin_lock_bh(&rose_node_list_lock);
413
414 rose_node = rose_node_list;
415 while (rose_node != NULL) {
416 if ((rose_node->mask == 10) &&
417 (rosecmpm(address, &rose_node->address, 10) == 0) &&
418 rose_node->loopback)
419 break;
420 rose_node = rose_node->next;
421 }
422
423 if (rose_node != NULL)
424 goto out;
425
426 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
427 err = -ENOMEM;
428 goto out;
429 }
430
431 rose_node->address = *address;
432 rose_node->mask = 10;
433 rose_node->count = 1;
434 rose_node->loopback = 1;
435 rose_node->neighbour[0] = rose_loopback_neigh;
436
437 /* Insert at the head of list. Address is always mask=10 */
438 rose_node->next = rose_node_list;
439 rose_node_list = rose_node;
440
441 rose_loopback_neigh->count++;
442
443 out:
444 spin_unlock_bh(&rose_node_list_lock);
445
446 return err;
447 }
448
449 /*
450 * Delete a loopback node.
451 */
452 void rose_del_loopback_node(rose_address *address)
453 {
454 struct rose_node *rose_node;
455
456 spin_lock_bh(&rose_node_list_lock);
457
458 rose_node = rose_node_list;
459 while (rose_node != NULL) {
460 if ((rose_node->mask == 10) &&
461 (rosecmpm(address, &rose_node->address, 10) == 0) &&
462 rose_node->loopback)
463 break;
464 rose_node = rose_node->next;
465 }
466
467 if (rose_node == NULL)
468 goto out;
469
470 rose_remove_node(rose_node);
471
472 rose_loopback_neigh->count--;
473
474 out:
475 spin_unlock_bh(&rose_node_list_lock);
476 }
477
478 /*
479 * A device has been removed. Remove its routes and neighbours.
480 */
481 void rose_rt_device_down(struct net_device *dev)
482 {
483 struct rose_neigh *s, *rose_neigh;
484 struct rose_node *t, *rose_node;
485 int i;
486
487 spin_lock_bh(&rose_node_list_lock);
488 spin_lock_bh(&rose_neigh_list_lock);
489 rose_neigh = rose_neigh_list;
490 while (rose_neigh != NULL) {
491 s = rose_neigh;
492 rose_neigh = rose_neigh->next;
493
494 if (s->dev != dev)
495 continue;
496
497 rose_node = rose_node_list;
498
499 while (rose_node != NULL) {
500 t = rose_node;
501 rose_node = rose_node->next;
502
503 for (i = 0; i < t->count; i++) {
504 if (t->neighbour[i] != s)
505 continue;
506
507 t->count--;
508
509 switch (i) {
510 case 0:
511 t->neighbour[0] = t->neighbour[1];
512 case 1:
513 t->neighbour[1] = t->neighbour[2];
514 case 2:
515 break;
516 }
517 }
518
519 if (t->count <= 0)
520 rose_remove_node(t);
521 }
522
523 rose_remove_neigh(s);
524 }
525 spin_unlock_bh(&rose_neigh_list_lock);
526 spin_unlock_bh(&rose_node_list_lock);
527 }
528
529 #if 0 /* Currently unused */
530 /*
531 * A device has been removed. Remove its links.
532 */
533 void rose_route_device_down(struct net_device *dev)
534 {
535 struct rose_route *s, *rose_route;
536
537 spin_lock_bh(&rose_route_list_lock);
538 rose_route = rose_route_list;
539 while (rose_route != NULL) {
540 s = rose_route;
541 rose_route = rose_route->next;
542
543 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
544 rose_remove_route(s);
545 }
546 spin_unlock_bh(&rose_route_list_lock);
547 }
548 #endif
549
550 /*
551 * Clear all nodes and neighbours out, except for neighbours with
552 * active connections going through them.
553 * Do not clear loopback neighbour and nodes.
554 */
555 static int rose_clear_routes(void)
556 {
557 struct rose_neigh *s, *rose_neigh;
558 struct rose_node *t, *rose_node;
559
560 spin_lock_bh(&rose_node_list_lock);
561 spin_lock_bh(&rose_neigh_list_lock);
562
563 rose_neigh = rose_neigh_list;
564 rose_node = rose_node_list;
565
566 while (rose_node != NULL) {
567 t = rose_node;
568 rose_node = rose_node->next;
569 if (!t->loopback)
570 rose_remove_node(t);
571 }
572
573 while (rose_neigh != NULL) {
574 s = rose_neigh;
575 rose_neigh = rose_neigh->next;
576
577 if (s->use == 0 && !s->loopback) {
578 s->count = 0;
579 rose_remove_neigh(s);
580 }
581 }
582
583 spin_unlock_bh(&rose_neigh_list_lock);
584 spin_unlock_bh(&rose_node_list_lock);
585
586 return 0;
587 }
588
589 /*
590 * Check that the device given is a valid AX.25 interface that is "up".
591 * called with RTNL
592 */
593 static struct net_device *rose_ax25_dev_find(char *devname)
594 {
595 struct net_device *dev;
596
597 if ((dev = __dev_get_by_name(&init_net, devname)) == NULL)
598 return NULL;
599
600 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
601 return dev;
602
603 return NULL;
604 }
605
606 /*
607 * Find the first active ROSE device, usually "rose0".
608 */
609 struct net_device *rose_dev_first(void)
610 {
611 struct net_device *dev, *first = NULL;
612
613 rcu_read_lock();
614 for_each_netdev_rcu(&init_net, dev) {
615 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
616 if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
617 first = dev;
618 }
619 rcu_read_unlock();
620
621 return first;
622 }
623
624 /*
625 * Find the ROSE device for the given address.
626 */
627 struct net_device *rose_dev_get(rose_address *addr)
628 {
629 struct net_device *dev;
630
631 rcu_read_lock();
632 for_each_netdev_rcu(&init_net, dev) {
633 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
634 dev_hold(dev);
635 goto out;
636 }
637 }
638 dev = NULL;
639 out:
640 rcu_read_unlock();
641 return dev;
642 }
643
644 static int rose_dev_exists(rose_address *addr)
645 {
646 struct net_device *dev;
647
648 rcu_read_lock();
649 for_each_netdev_rcu(&init_net, dev) {
650 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
651 goto out;
652 }
653 dev = NULL;
654 out:
655 rcu_read_unlock();
656 return dev != NULL;
657 }
658
659
660
661
662 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
663 {
664 struct rose_route *rose_route;
665
666 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
667 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
668 (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
669 return rose_route;
670
671 return NULL;
672 }
673
674 /*
675 * Find a neighbour or a route given a ROSE address.
676 */
677 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
678 unsigned char *diagnostic, int route_frame)
679 {
680 struct rose_neigh *res = NULL;
681 struct rose_node *node;
682 int failed = 0;
683 int i;
684
685 if (!route_frame) spin_lock_bh(&rose_node_list_lock);
686 for (node = rose_node_list; node != NULL; node = node->next) {
687 if (rosecmpm(addr, &node->address, node->mask) == 0) {
688 for (i = 0; i < node->count; i++) {
689 if (node->neighbour[i]->restarted) {
690 res = node->neighbour[i];
691 goto out;
692 }
693 }
694 }
695 }
696 if (!route_frame) { /* connect request */
697 for (node = rose_node_list; node != NULL; node = node->next) {
698 if (rosecmpm(addr, &node->address, node->mask) == 0) {
699 for (i = 0; i < node->count; i++) {
700 if (!rose_ftimer_running(node->neighbour[i])) {
701 res = node->neighbour[i];
702 failed = 0;
703 goto out;
704 }
705 failed = 1;
706 }
707 }
708 }
709 }
710
711 if (failed) {
712 *cause = ROSE_OUT_OF_ORDER;
713 *diagnostic = 0;
714 } else {
715 *cause = ROSE_NOT_OBTAINABLE;
716 *diagnostic = 0;
717 }
718
719 out:
720 if (!route_frame) spin_unlock_bh(&rose_node_list_lock);
721 return res;
722 }
723
724 /*
725 * Handle the ioctls that control the routing functions.
726 */
727 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
728 {
729 struct rose_route_struct rose_route;
730 struct net_device *dev;
731 int err;
732
733 switch (cmd) {
734 case SIOCADDRT:
735 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
736 return -EFAULT;
737 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
738 return -EINVAL;
739 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */
740 return -EINVAL;
741 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
742 return -EINVAL;
743 if (rose_route.ndigis > AX25_MAX_DIGIS)
744 return -EINVAL;
745 err = rose_add_node(&rose_route, dev);
746 return err;
747
748 case SIOCDELRT:
749 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
750 return -EFAULT;
751 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
752 return -EINVAL;
753 err = rose_del_node(&rose_route, dev);
754 return err;
755
756 case SIOCRSCLRRT:
757 return rose_clear_routes();
758
759 default:
760 return -EINVAL;
761 }
762
763 return 0;
764 }
765
766 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
767 {
768 struct rose_route *rose_route, *s;
769
770 rose_neigh->restarted = 0;
771
772 rose_stop_t0timer(rose_neigh);
773 rose_start_ftimer(rose_neigh);
774
775 skb_queue_purge(&rose_neigh->queue);
776
777 spin_lock_bh(&rose_route_list_lock);
778
779 rose_route = rose_route_list;
780
781 while (rose_route != NULL) {
782 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
783 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) ||
784 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
785 s = rose_route->next;
786 rose_remove_route(rose_route);
787 rose_route = s;
788 continue;
789 }
790
791 if (rose_route->neigh1 == rose_neigh) {
792 rose_route->neigh1->use--;
793 rose_route->neigh1 = NULL;
794 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
795 }
796
797 if (rose_route->neigh2 == rose_neigh) {
798 rose_route->neigh2->use--;
799 rose_route->neigh2 = NULL;
800 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
801 }
802
803 rose_route = rose_route->next;
804 }
805 spin_unlock_bh(&rose_route_list_lock);
806 }
807
808 /*
809 * A level 2 link has timed out, therefore it appears to be a poor link,
810 * then don't use that neighbour until it is reset. Blow away all through
811 * routes and connections using this route.
812 */
813 void rose_link_failed(ax25_cb *ax25, int reason)
814 {
815 struct rose_neigh *rose_neigh;
816
817 spin_lock_bh(&rose_neigh_list_lock);
818 rose_neigh = rose_neigh_list;
819 while (rose_neigh != NULL) {
820 if (rose_neigh->ax25 == ax25)
821 break;
822 rose_neigh = rose_neigh->next;
823 }
824
825 if (rose_neigh != NULL) {
826 rose_neigh->ax25 = NULL;
827 ax25_cb_put(ax25);
828
829 rose_del_route_by_neigh(rose_neigh);
830 rose_kill_by_neigh(rose_neigh);
831 }
832 spin_unlock_bh(&rose_neigh_list_lock);
833 }
834
835 /*
836 * A device has been "downed" remove its link status. Blow away all
837 * through routes and connections that use this device.
838 */
839 void rose_link_device_down(struct net_device *dev)
840 {
841 struct rose_neigh *rose_neigh;
842
843 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
844 if (rose_neigh->dev == dev) {
845 rose_del_route_by_neigh(rose_neigh);
846 rose_kill_by_neigh(rose_neigh);
847 }
848 }
849 }
850
851 /*
852 * Route a frame to an appropriate AX.25 connection.
853 */
854 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
855 {
856 struct rose_neigh *rose_neigh, *new_neigh;
857 struct rose_route *rose_route;
858 struct rose_facilities_struct facilities;
859 rose_address *src_addr, *dest_addr;
860 struct sock *sk;
861 unsigned short frametype;
862 unsigned int lci, new_lci;
863 unsigned char cause, diagnostic;
864 struct net_device *dev;
865 int res = 0;
866 char buf[11];
867
868 if (skb->len < ROSE_MIN_LEN)
869 return res;
870 frametype = skb->data[2];
871 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
872 if (frametype == ROSE_CALL_REQUEST &&
873 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
874 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
875 ROSE_CALL_REQ_ADDR_LEN_VAL))
876 return res;
877 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF);
878 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
879
880 spin_lock_bh(&rose_neigh_list_lock);
881 spin_lock_bh(&rose_route_list_lock);
882
883 rose_neigh = rose_neigh_list;
884 while (rose_neigh != NULL) {
885 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
886 ax25->ax25_dev->dev == rose_neigh->dev)
887 break;
888 rose_neigh = rose_neigh->next;
889 }
890
891 if (rose_neigh == NULL) {
892 printk("rose_route : unknown neighbour or device %s\n",
893 ax2asc(buf, &ax25->dest_addr));
894 goto out;
895 }
896
897 /*
898 * Obviously the link is working, halt the ftimer.
899 */
900 rose_stop_ftimer(rose_neigh);
901
902 /*
903 * LCI of zero is always for us, and its always a restart
904 * frame.
905 */
906 if (lci == 0) {
907 rose_link_rx_restart(skb, rose_neigh, frametype);
908 goto out;
909 }
910
911 /*
912 * Find an existing socket.
913 */
914 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
915 if (frametype == ROSE_CALL_REQUEST) {
916 struct rose_sock *rose = rose_sk(sk);
917
918 /* Remove an existing unused socket */
919 rose_clear_queues(sk);
920 rose->cause = ROSE_NETWORK_CONGESTION;
921 rose->diagnostic = 0;
922 rose->neighbour->use--;
923 rose->neighbour = NULL;
924 rose->lci = 0;
925 rose->state = ROSE_STATE_0;
926 sk->sk_state = TCP_CLOSE;
927 sk->sk_err = 0;
928 sk->sk_shutdown |= SEND_SHUTDOWN;
929 if (!sock_flag(sk, SOCK_DEAD)) {
930 sk->sk_state_change(sk);
931 sock_set_flag(sk, SOCK_DEAD);
932 }
933 }
934 else {
935 skb_reset_transport_header(skb);
936 res = rose_process_rx_frame(sk, skb);
937 goto out;
938 }
939 }
940
941 /*
942 * Is is a Call Request and is it for us ?
943 */
944 if (frametype == ROSE_CALL_REQUEST)
945 if ((dev = rose_dev_get(dest_addr)) != NULL) {
946 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
947 dev_put(dev);
948 goto out;
949 }
950
951 if (!sysctl_rose_routing_control) {
952 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
953 goto out;
954 }
955
956 /*
957 * Route it to the next in line if we have an entry for it.
958 */
959 rose_route = rose_route_list;
960 while (rose_route != NULL) {
961 if (rose_route->lci1 == lci &&
962 rose_route->neigh1 == rose_neigh) {
963 if (frametype == ROSE_CALL_REQUEST) {
964 /* F6FBB - Remove an existing unused route */
965 rose_remove_route(rose_route);
966 break;
967 } else if (rose_route->neigh2 != NULL) {
968 skb->data[0] &= 0xF0;
969 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
970 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
971 rose_transmit_link(skb, rose_route->neigh2);
972 if (frametype == ROSE_CLEAR_CONFIRMATION)
973 rose_remove_route(rose_route);
974 res = 1;
975 goto out;
976 } else {
977 if (frametype == ROSE_CLEAR_CONFIRMATION)
978 rose_remove_route(rose_route);
979 goto out;
980 }
981 }
982 if (rose_route->lci2 == lci &&
983 rose_route->neigh2 == rose_neigh) {
984 if (frametype == ROSE_CALL_REQUEST) {
985 /* F6FBB - Remove an existing unused route */
986 rose_remove_route(rose_route);
987 break;
988 } else if (rose_route->neigh1 != NULL) {
989 skb->data[0] &= 0xF0;
990 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
991 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
992 rose_transmit_link(skb, rose_route->neigh1);
993 if (frametype == ROSE_CLEAR_CONFIRMATION)
994 rose_remove_route(rose_route);
995 res = 1;
996 goto out;
997 } else {
998 if (frametype == ROSE_CLEAR_CONFIRMATION)
999 rose_remove_route(rose_route);
1000 goto out;
1001 }
1002 }
1003 rose_route = rose_route->next;
1004 }
1005
1006 /*
1007 * We know that:
1008 * 1. The frame isn't for us,
1009 * 2. It isn't "owned" by any existing route.
1010 */
1011 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
1012 res = 0;
1013 goto out;
1014 }
1015
1016 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1017
1018 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF,
1019 skb->len - ROSE_CALL_REQ_FACILITIES_OFF,
1020 &facilities)) {
1021 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1022 goto out;
1023 }
1024
1025 /*
1026 * Check for routing loops.
1027 */
1028 rose_route = rose_route_list;
1029 while (rose_route != NULL) {
1030 if (rose_route->rand == facilities.rand &&
1031 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1032 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1033 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1034 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1035 goto out;
1036 }
1037 rose_route = rose_route->next;
1038 }
1039
1040 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) {
1041 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1042 goto out;
1043 }
1044
1045 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1046 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1047 goto out;
1048 }
1049
1050 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1051 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1052 goto out;
1053 }
1054
1055 rose_route->lci1 = lci;
1056 rose_route->src_addr = *src_addr;
1057 rose_route->dest_addr = *dest_addr;
1058 rose_route->src_call = facilities.dest_call;
1059 rose_route->dest_call = facilities.source_call;
1060 rose_route->rand = facilities.rand;
1061 rose_route->neigh1 = rose_neigh;
1062 rose_route->lci2 = new_lci;
1063 rose_route->neigh2 = new_neigh;
1064
1065 rose_route->neigh1->use++;
1066 rose_route->neigh2->use++;
1067
1068 rose_route->next = rose_route_list;
1069 rose_route_list = rose_route;
1070
1071 skb->data[0] &= 0xF0;
1072 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1073 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1074
1075 rose_transmit_link(skb, rose_route->neigh2);
1076 res = 1;
1077
1078 out:
1079 spin_unlock_bh(&rose_route_list_lock);
1080 spin_unlock_bh(&rose_neigh_list_lock);
1081
1082 return res;
1083 }
1084
1085 #ifdef CONFIG_PROC_FS
1086
1087 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1088 __acquires(rose_node_list_lock)
1089 {
1090 struct rose_node *rose_node;
1091 int i = 1;
1092
1093 spin_lock_bh(&rose_node_list_lock);
1094 if (*pos == 0)
1095 return SEQ_START_TOKEN;
1096
1097 for (rose_node = rose_node_list; rose_node && i < *pos;
1098 rose_node = rose_node->next, ++i);
1099
1100 return (i == *pos) ? rose_node : NULL;
1101 }
1102
1103 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1104 {
1105 ++*pos;
1106
1107 return (v == SEQ_START_TOKEN) ? rose_node_list
1108 : ((struct rose_node *)v)->next;
1109 }
1110
1111 static void rose_node_stop(struct seq_file *seq, void *v)
1112 __releases(rose_node_list_lock)
1113 {
1114 spin_unlock_bh(&rose_node_list_lock);
1115 }
1116
1117 static int rose_node_show(struct seq_file *seq, void *v)
1118 {
1119 char rsbuf[11];
1120 int i;
1121
1122 if (v == SEQ_START_TOKEN)
1123 seq_puts(seq, "address mask n neigh neigh neigh\n");
1124 else {
1125 const struct rose_node *rose_node = v;
1126 /* if (rose_node->loopback) {
1127 seq_printf(seq, "%-10s %04d 1 loopback\n",
1128 rose2asc(rsbuf, &rose_node->address),
1129 rose_node->mask);
1130 } else { */
1131 seq_printf(seq, "%-10s %04d %d",
1132 rose2asc(rsbuf, &rose_node->address),
1133 rose_node->mask,
1134 rose_node->count);
1135
1136 for (i = 0; i < rose_node->count; i++)
1137 seq_printf(seq, " %05d",
1138 rose_node->neighbour[i]->number);
1139
1140 seq_puts(seq, "\n");
1141 /* } */
1142 }
1143 return 0;
1144 }
1145
1146 static const struct seq_operations rose_node_seqops = {
1147 .start = rose_node_start,
1148 .next = rose_node_next,
1149 .stop = rose_node_stop,
1150 .show = rose_node_show,
1151 };
1152
1153 static int rose_nodes_open(struct inode *inode, struct file *file)
1154 {
1155 return seq_open(file, &rose_node_seqops);
1156 }
1157
1158 const struct file_operations rose_nodes_fops = {
1159 .owner = THIS_MODULE,
1160 .open = rose_nodes_open,
1161 .read = seq_read,
1162 .llseek = seq_lseek,
1163 .release = seq_release,
1164 };
1165
1166 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1167 __acquires(rose_neigh_list_lock)
1168 {
1169 struct rose_neigh *rose_neigh;
1170 int i = 1;
1171
1172 spin_lock_bh(&rose_neigh_list_lock);
1173 if (*pos == 0)
1174 return SEQ_START_TOKEN;
1175
1176 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1177 rose_neigh = rose_neigh->next, ++i);
1178
1179 return (i == *pos) ? rose_neigh : NULL;
1180 }
1181
1182 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1183 {
1184 ++*pos;
1185
1186 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1187 : ((struct rose_neigh *)v)->next;
1188 }
1189
1190 static void rose_neigh_stop(struct seq_file *seq, void *v)
1191 __releases(rose_neigh_list_lock)
1192 {
1193 spin_unlock_bh(&rose_neigh_list_lock);
1194 }
1195
1196 static int rose_neigh_show(struct seq_file *seq, void *v)
1197 {
1198 char buf[11];
1199 int i;
1200
1201 if (v == SEQ_START_TOKEN)
1202 seq_puts(seq,
1203 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1204 else {
1205 struct rose_neigh *rose_neigh = v;
1206
1207 /* if (!rose_neigh->loopback) { */
1208 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1209 rose_neigh->number,
1210 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1211 rose_neigh->dev ? rose_neigh->dev->name : "???",
1212 rose_neigh->count,
1213 rose_neigh->use,
1214 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1215 (rose_neigh->restarted) ? "yes" : "no",
1216 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1217 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1218
1219 if (rose_neigh->digipeat != NULL) {
1220 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1221 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1222 }
1223
1224 seq_puts(seq, "\n");
1225 }
1226 return 0;
1227 }
1228
1229
1230 static const struct seq_operations rose_neigh_seqops = {
1231 .start = rose_neigh_start,
1232 .next = rose_neigh_next,
1233 .stop = rose_neigh_stop,
1234 .show = rose_neigh_show,
1235 };
1236
1237 static int rose_neigh_open(struct inode *inode, struct file *file)
1238 {
1239 return seq_open(file, &rose_neigh_seqops);
1240 }
1241
1242 const struct file_operations rose_neigh_fops = {
1243 .owner = THIS_MODULE,
1244 .open = rose_neigh_open,
1245 .read = seq_read,
1246 .llseek = seq_lseek,
1247 .release = seq_release,
1248 };
1249
1250
1251 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1252 __acquires(rose_route_list_lock)
1253 {
1254 struct rose_route *rose_route;
1255 int i = 1;
1256
1257 spin_lock_bh(&rose_route_list_lock);
1258 if (*pos == 0)
1259 return SEQ_START_TOKEN;
1260
1261 for (rose_route = rose_route_list; rose_route && i < *pos;
1262 rose_route = rose_route->next, ++i);
1263
1264 return (i == *pos) ? rose_route : NULL;
1265 }
1266
1267 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1268 {
1269 ++*pos;
1270
1271 return (v == SEQ_START_TOKEN) ? rose_route_list
1272 : ((struct rose_route *)v)->next;
1273 }
1274
1275 static void rose_route_stop(struct seq_file *seq, void *v)
1276 __releases(rose_route_list_lock)
1277 {
1278 spin_unlock_bh(&rose_route_list_lock);
1279 }
1280
1281 static int rose_route_show(struct seq_file *seq, void *v)
1282 {
1283 char buf[11], rsbuf[11];
1284
1285 if (v == SEQ_START_TOKEN)
1286 seq_puts(seq,
1287 "lci address callsign neigh <-> lci address callsign neigh\n");
1288 else {
1289 struct rose_route *rose_route = v;
1290
1291 if (rose_route->neigh1)
1292 seq_printf(seq,
1293 "%3.3X %-10s %-9s %05d ",
1294 rose_route->lci1,
1295 rose2asc(rsbuf, &rose_route->src_addr),
1296 ax2asc(buf, &rose_route->src_call),
1297 rose_route->neigh1->number);
1298 else
1299 seq_puts(seq,
1300 "000 * * 00000 ");
1301
1302 if (rose_route->neigh2)
1303 seq_printf(seq,
1304 "%3.3X %-10s %-9s %05d\n",
1305 rose_route->lci2,
1306 rose2asc(rsbuf, &rose_route->dest_addr),
1307 ax2asc(buf, &rose_route->dest_call),
1308 rose_route->neigh2->number);
1309 else
1310 seq_puts(seq,
1311 "000 * * 00000\n");
1312 }
1313 return 0;
1314 }
1315
1316 static const struct seq_operations rose_route_seqops = {
1317 .start = rose_route_start,
1318 .next = rose_route_next,
1319 .stop = rose_route_stop,
1320 .show = rose_route_show,
1321 };
1322
1323 static int rose_route_open(struct inode *inode, struct file *file)
1324 {
1325 return seq_open(file, &rose_route_seqops);
1326 }
1327
1328 const struct file_operations rose_routes_fops = {
1329 .owner = THIS_MODULE,
1330 .open = rose_route_open,
1331 .read = seq_read,
1332 .llseek = seq_lseek,
1333 .release = seq_release,
1334 };
1335
1336 #endif /* CONFIG_PROC_FS */
1337
1338 /*
1339 * Release all memory associated with ROSE routing structures.
1340 */
1341 void __exit rose_rt_free(void)
1342 {
1343 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1344 struct rose_node *t, *rose_node = rose_node_list;
1345 struct rose_route *u, *rose_route = rose_route_list;
1346
1347 while (rose_neigh != NULL) {
1348 s = rose_neigh;
1349 rose_neigh = rose_neigh->next;
1350
1351 rose_remove_neigh(s);
1352 }
1353
1354 while (rose_node != NULL) {
1355 t = rose_node;
1356 rose_node = rose_node->next;
1357
1358 rose_remove_node(t);
1359 }
1360
1361 while (rose_route != NULL) {
1362 u = rose_route;
1363 rose_route = rose_route->next;
1364
1365 rose_remove_route(u);
1366 }
1367 }
Linux 2.6 libata-dev (mirror)