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x86: only compile floppy driver if CONFIG_ISA_DMA_API is enabled
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / rose / rose_route.c
blob88a77e90e7e86835587aabdb17f6805377f8df82
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 whith 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 len, 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 frametype = skb->data[2];
873 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
874 src_addr = (rose_address *)(skb->data + 9);
875 dest_addr = (rose_address *)(skb->data + 4);
876
877 spin_lock_bh(&rose_neigh_list_lock);
878 spin_lock_bh(&rose_route_list_lock);
879
880 rose_neigh = rose_neigh_list;
881 while (rose_neigh != NULL) {
882 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
883 ax25->ax25_dev->dev == rose_neigh->dev)
884 break;
885 rose_neigh = rose_neigh->next;
886 }
887
888 if (rose_neigh == NULL) {
889 printk("rose_route : unknown neighbour or device %s\n",
890 ax2asc(buf, &ax25->dest_addr));
891 goto out;
892 }
893
894 /*
895 * Obviously the link is working, halt the ftimer.
896 */
897 rose_stop_ftimer(rose_neigh);
898
899 /*
900 * LCI of zero is always for us, and its always a restart
901 * frame.
902 */
903 if (lci == 0) {
904 rose_link_rx_restart(skb, rose_neigh, frametype);
905 goto out;
906 }
907
908 /*
909 * Find an existing socket.
910 */
911 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
912 if (frametype == ROSE_CALL_REQUEST) {
913 struct rose_sock *rose = rose_sk(sk);
914
915 /* Remove an existing unused socket */
916 rose_clear_queues(sk);
917 rose->cause = ROSE_NETWORK_CONGESTION;
918 rose->diagnostic = 0;
919 rose->neighbour->use--;
920 rose->neighbour = NULL;
921 rose->lci = 0;
922 rose->state = ROSE_STATE_0;
923 sk->sk_state = TCP_CLOSE;
924 sk->sk_err = 0;
925 sk->sk_shutdown |= SEND_SHUTDOWN;
926 if (!sock_flag(sk, SOCK_DEAD)) {
927 sk->sk_state_change(sk);
928 sock_set_flag(sk, SOCK_DEAD);
929 }
930 }
931 else {
932 skb_reset_transport_header(skb);
933 res = rose_process_rx_frame(sk, skb);
934 goto out;
935 }
936 }
937
938 /*
939 * Is is a Call Request and is it for us ?
940 */
941 if (frametype == ROSE_CALL_REQUEST)
942 if ((dev = rose_dev_get(dest_addr)) != NULL) {
943 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
944 dev_put(dev);
945 goto out;
946 }
947
948 if (!sysctl_rose_routing_control) {
949 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
950 goto out;
951 }
952
953 /*
954 * Route it to the next in line if we have an entry for it.
955 */
956 rose_route = rose_route_list;
957 while (rose_route != NULL) {
958 if (rose_route->lci1 == lci &&
959 rose_route->neigh1 == rose_neigh) {
960 if (frametype == ROSE_CALL_REQUEST) {
961 /* F6FBB - Remove an existing unused route */
962 rose_remove_route(rose_route);
963 break;
964 } else if (rose_route->neigh2 != NULL) {
965 skb->data[0] &= 0xF0;
966 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
967 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
968 rose_transmit_link(skb, rose_route->neigh2);
969 if (frametype == ROSE_CLEAR_CONFIRMATION)
970 rose_remove_route(rose_route);
971 res = 1;
972 goto out;
973 } else {
974 if (frametype == ROSE_CLEAR_CONFIRMATION)
975 rose_remove_route(rose_route);
976 goto out;
977 }
978 }
979 if (rose_route->lci2 == lci &&
980 rose_route->neigh2 == rose_neigh) {
981 if (frametype == ROSE_CALL_REQUEST) {
982 /* F6FBB - Remove an existing unused route */
983 rose_remove_route(rose_route);
984 break;
985 } else if (rose_route->neigh1 != NULL) {
986 skb->data[0] &= 0xF0;
987 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
988 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
989 rose_transmit_link(skb, rose_route->neigh1);
990 if (frametype == ROSE_CLEAR_CONFIRMATION)
991 rose_remove_route(rose_route);
992 res = 1;
993 goto out;
994 } else {
995 if (frametype == ROSE_CLEAR_CONFIRMATION)
996 rose_remove_route(rose_route);
997 goto out;
998 }
999 }
1000 rose_route = rose_route->next;
1001 }
1002
1003 /*
1004 * We know that:
1005 * 1. The frame isn't for us,
1006 * 2. It isn't "owned" by any existing route.
1007 */
1008 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
1009 res = 0;
1010 goto out;
1011 }
1012
1013 len = (((skb->data[3] >> 4) & 0x0F) + 1) >> 1;
1014 len += (((skb->data[3] >> 0) & 0x0F) + 1) >> 1;
1015
1016 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1017
1018 if (!rose_parse_facilities(skb->data + len + 4, &facilities)) {
1019 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1020 goto out;
1021 }
1022
1023 /*
1024 * Check for routing loops.
1025 */
1026 rose_route = rose_route_list;
1027 while (rose_route != NULL) {
1028 if (rose_route->rand == facilities.rand &&
1029 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1030 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1031 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1032 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1033 goto out;
1034 }
1035 rose_route = rose_route->next;
1036 }
1037
1038 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) {
1039 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1040 goto out;
1041 }
1042
1043 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1044 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1045 goto out;
1046 }
1047
1048 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1049 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1050 goto out;
1051 }
1052
1053 rose_route->lci1 = lci;
1054 rose_route->src_addr = *src_addr;
1055 rose_route->dest_addr = *dest_addr;
1056 rose_route->src_call = facilities.dest_call;
1057 rose_route->dest_call = facilities.source_call;
1058 rose_route->rand = facilities.rand;
1059 rose_route->neigh1 = rose_neigh;
1060 rose_route->lci2 = new_lci;
1061 rose_route->neigh2 = new_neigh;
1062
1063 rose_route->neigh1->use++;
1064 rose_route->neigh2->use++;
1065
1066 rose_route->next = rose_route_list;
1067 rose_route_list = rose_route;
1068
1069 skb->data[0] &= 0xF0;
1070 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1071 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1072
1073 rose_transmit_link(skb, rose_route->neigh2);
1074 res = 1;
1075
1076 out:
1077 spin_unlock_bh(&rose_route_list_lock);
1078 spin_unlock_bh(&rose_neigh_list_lock);
1079
1080 return res;
1081 }
1082
1083 #ifdef CONFIG_PROC_FS
1084
1085 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1086 __acquires(rose_node_list_lock)
1087 {
1088 struct rose_node *rose_node;
1089 int i = 1;
1090
1091 spin_lock_bh(&rose_node_list_lock);
1092 if (*pos == 0)
1093 return SEQ_START_TOKEN;
1094
1095 for (rose_node = rose_node_list; rose_node && i < *pos;
1096 rose_node = rose_node->next, ++i);
1097
1098 return (i == *pos) ? rose_node : NULL;
1099 }
1100
1101 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1102 {
1103 ++*pos;
1104
1105 return (v == SEQ_START_TOKEN) ? rose_node_list
1106 : ((struct rose_node *)v)->next;
1107 }
1108
1109 static void rose_node_stop(struct seq_file *seq, void *v)
1110 __releases(rose_node_list_lock)
1111 {
1112 spin_unlock_bh(&rose_node_list_lock);
1113 }
1114
1115 static int rose_node_show(struct seq_file *seq, void *v)
1116 {
1117 char rsbuf[11];
1118 int i;
1119
1120 if (v == SEQ_START_TOKEN)
1121 seq_puts(seq, "address mask n neigh neigh neigh\n");
1122 else {
1123 const struct rose_node *rose_node = v;
1124 /* if (rose_node->loopback) {
1125 seq_printf(seq, "%-10s %04d 1 loopback\n",
1126 rose2asc(rsbuf, &rose_node->address),
1127 rose_node->mask);
1128 } else { */
1129 seq_printf(seq, "%-10s %04d %d",
1130 rose2asc(rsbuf, &rose_node->address),
1131 rose_node->mask,
1132 rose_node->count);
1133
1134 for (i = 0; i < rose_node->count; i++)
1135 seq_printf(seq, " %05d",
1136 rose_node->neighbour[i]->number);
1137
1138 seq_puts(seq, "\n");
1139 /* } */
1140 }
1141 return 0;
1142 }
1143
1144 static const struct seq_operations rose_node_seqops = {
1145 .start = rose_node_start,
1146 .next = rose_node_next,
1147 .stop = rose_node_stop,
1148 .show = rose_node_show,
1149 };
1150
1151 static int rose_nodes_open(struct inode *inode, struct file *file)
1152 {
1153 return seq_open(file, &rose_node_seqops);
1154 }
1155
1156 const struct file_operations rose_nodes_fops = {
1157 .owner = THIS_MODULE,
1158 .open = rose_nodes_open,
1159 .read = seq_read,
1160 .llseek = seq_lseek,
1161 .release = seq_release,
1162 };
1163
1164 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1165 __acquires(rose_neigh_list_lock)
1166 {
1167 struct rose_neigh *rose_neigh;
1168 int i = 1;
1169
1170 spin_lock_bh(&rose_neigh_list_lock);
1171 if (*pos == 0)
1172 return SEQ_START_TOKEN;
1173
1174 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1175 rose_neigh = rose_neigh->next, ++i);
1176
1177 return (i == *pos) ? rose_neigh : NULL;
1178 }
1179
1180 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1181 {
1182 ++*pos;
1183
1184 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1185 : ((struct rose_neigh *)v)->next;
1186 }
1187
1188 static void rose_neigh_stop(struct seq_file *seq, void *v)
1189 __releases(rose_neigh_list_lock)
1190 {
1191 spin_unlock_bh(&rose_neigh_list_lock);
1192 }
1193
1194 static int rose_neigh_show(struct seq_file *seq, void *v)
1195 {
1196 char buf[11];
1197 int i;
1198
1199 if (v == SEQ_START_TOKEN)
1200 seq_puts(seq,
1201 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1202 else {
1203 struct rose_neigh *rose_neigh = v;
1204
1205 /* if (!rose_neigh->loopback) { */
1206 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1207 rose_neigh->number,
1208 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1209 rose_neigh->dev ? rose_neigh->dev->name : "???",
1210 rose_neigh->count,
1211 rose_neigh->use,
1212 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1213 (rose_neigh->restarted) ? "yes" : "no",
1214 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1215 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1216
1217 if (rose_neigh->digipeat != NULL) {
1218 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1219 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1220 }
1221
1222 seq_puts(seq, "\n");
1223 }
1224 return 0;
1225 }
1226
1227
1228 static const struct seq_operations rose_neigh_seqops = {
1229 .start = rose_neigh_start,
1230 .next = rose_neigh_next,
1231 .stop = rose_neigh_stop,
1232 .show = rose_neigh_show,
1233 };
1234
1235 static int rose_neigh_open(struct inode *inode, struct file *file)
1236 {
1237 return seq_open(file, &rose_neigh_seqops);
1238 }
1239
1240 const struct file_operations rose_neigh_fops = {
1241 .owner = THIS_MODULE,
1242 .open = rose_neigh_open,
1243 .read = seq_read,
1244 .llseek = seq_lseek,
1245 .release = seq_release,
1246 };
1247
1248
1249 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1250 __acquires(rose_route_list_lock)
1251 {
1252 struct rose_route *rose_route;
1253 int i = 1;
1254
1255 spin_lock_bh(&rose_route_list_lock);
1256 if (*pos == 0)
1257 return SEQ_START_TOKEN;
1258
1259 for (rose_route = rose_route_list; rose_route && i < *pos;
1260 rose_route = rose_route->next, ++i);
1261
1262 return (i == *pos) ? rose_route : NULL;
1263 }
1264
1265 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1266 {
1267 ++*pos;
1268
1269 return (v == SEQ_START_TOKEN) ? rose_route_list
1270 : ((struct rose_route *)v)->next;
1271 }
1272
1273 static void rose_route_stop(struct seq_file *seq, void *v)
1274 __releases(rose_route_list_lock)
1275 {
1276 spin_unlock_bh(&rose_route_list_lock);
1277 }
1278
1279 static int rose_route_show(struct seq_file *seq, void *v)
1280 {
1281 char buf[11], rsbuf[11];
1282
1283 if (v == SEQ_START_TOKEN)
1284 seq_puts(seq,
1285 "lci address callsign neigh <-> lci address callsign neigh\n");
1286 else {
1287 struct rose_route *rose_route = v;
1288
1289 if (rose_route->neigh1)
1290 seq_printf(seq,
1291 "%3.3X %-10s %-9s %05d ",
1292 rose_route->lci1,
1293 rose2asc(rsbuf, &rose_route->src_addr),
1294 ax2asc(buf, &rose_route->src_call),
1295 rose_route->neigh1->number);
1296 else
1297 seq_puts(seq,
1298 "000 * * 00000 ");
1299
1300 if (rose_route->neigh2)
1301 seq_printf(seq,
1302 "%3.3X %-10s %-9s %05d\n",
1303 rose_route->lci2,
1304 rose2asc(rsbuf, &rose_route->dest_addr),
1305 ax2asc(buf, &rose_route->dest_call),
1306 rose_route->neigh2->number);
1307 else
1308 seq_puts(seq,
1309 "000 * * 00000\n");
1310 }
1311 return 0;
1312 }
1313
1314 static const struct seq_operations rose_route_seqops = {
1315 .start = rose_route_start,
1316 .next = rose_route_next,
1317 .stop = rose_route_stop,
1318 .show = rose_route_show,
1319 };
1320
1321 static int rose_route_open(struct inode *inode, struct file *file)
1322 {
1323 return seq_open(file, &rose_route_seqops);
1324 }
1325
1326 const struct file_operations rose_routes_fops = {
1327 .owner = THIS_MODULE,
1328 .open = rose_route_open,
1329 .read = seq_read,
1330 .llseek = seq_lseek,
1331 .release = seq_release,
1332 };
1333
1334 #endif /* CONFIG_PROC_FS */
1335
1336 /*
1337 * Release all memory associated with ROSE routing structures.
1338 */
1339 void __exit rose_rt_free(void)
1340 {
1341 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1342 struct rose_node *t, *rose_node = rose_node_list;
1343 struct rose_route *u, *rose_route = rose_route_list;
1344
1345 while (rose_neigh != NULL) {
1346 s = rose_neigh;
1347 rose_neigh = rose_neigh->next;
1348
1349 rose_remove_neigh(s);
1350 }
1351
1352 while (rose_node != NULL) {
1353 t = rose_node;
1354 rose_node = rose_node->next;
1355
1356 rose_remove_node(t);
1357 }
1358
1359 while (rose_route != NULL) {
1360 u = rose_route;
1361 rose_route = rose_route->next;
1362
1363 rose_remove_route(u);
1364 }
1365 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree