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Merge tag 'io_uring-5.11-2021-01-16' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / rose / rose_route.c
blob6e35703ff353d731ea07012963931437cf96a7be
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 *
4 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
5 * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net)
6 */
7 #include <linux/errno.h>
8 #include <linux/types.h>
9 #include <linux/socket.h>
10 #include <linux/in.h>
11 #include <linux/kernel.h>
12 #include <linux/timer.h>
13 #include <linux/string.h>
14 #include <linux/sockios.h>
15 #include <linux/net.h>
16 #include <linux/slab.h>
17 #include <net/ax25.h>
18 #include <linux/inet.h>
19 #include <linux/netdevice.h>
20 #include <net/arp.h>
21 #include <linux/if_arp.h>
22 #include <linux/skbuff.h>
23 #include <net/sock.h>
24 #include <net/tcp_states.h>
25 #include <linux/uaccess.h>
26 #include <linux/fcntl.h>
27 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
28 #include <linux/mm.h>
29 #include <linux/interrupt.h>
30 #include <linux/notifier.h>
31 #include <linux/init.h>
32 #include <net/rose.h>
33 #include <linux/seq_file.h>
34 #include <linux/export.h>
35
36 static unsigned int rose_neigh_no = 1;
37
38 static struct rose_node *rose_node_list;
39 static DEFINE_SPINLOCK(rose_node_list_lock);
40 static struct rose_neigh *rose_neigh_list;
41 static DEFINE_SPINLOCK(rose_neigh_list_lock);
42 static struct rose_route *rose_route_list;
43 static DEFINE_SPINLOCK(rose_route_list_lock);
44
45 struct rose_neigh *rose_loopback_neigh;
46
47 /*
48 * Add a new route to a node, and in the process add the node and the
49 * neighbour if it is new.
50 */
51 static int __must_check rose_add_node(struct rose_route_struct *rose_route,
52 struct net_device *dev)
53 {
54 struct rose_node *rose_node, *rose_tmpn, *rose_tmpp;
55 struct rose_neigh *rose_neigh;
56 int i, res = 0;
57
58 spin_lock_bh(&rose_node_list_lock);
59 spin_lock_bh(&rose_neigh_list_lock);
60
61 rose_node = rose_node_list;
62 while (rose_node != NULL) {
63 if ((rose_node->mask == rose_route->mask) &&
64 (rosecmpm(&rose_route->address, &rose_node->address,
65 rose_route->mask) == 0))
66 break;
67 rose_node = rose_node->next;
68 }
69
70 if (rose_node != NULL && rose_node->loopback) {
71 res = -EINVAL;
72 goto out;
73 }
74
75 rose_neigh = rose_neigh_list;
76 while (rose_neigh != NULL) {
77 if (ax25cmp(&rose_route->neighbour,
78 &rose_neigh->callsign) == 0 &&
79 rose_neigh->dev == dev)
80 break;
81 rose_neigh = rose_neigh->next;
82 }
83
84 if (rose_neigh == NULL) {
85 rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC);
86 if (rose_neigh == NULL) {
87 res = -ENOMEM;
88 goto out;
89 }
90
91 rose_neigh->callsign = rose_route->neighbour;
92 rose_neigh->digipeat = NULL;
93 rose_neigh->ax25 = NULL;
94 rose_neigh->dev = dev;
95 rose_neigh->count = 0;
96 rose_neigh->use = 0;
97 rose_neigh->dce_mode = 0;
98 rose_neigh->loopback = 0;
99 rose_neigh->number = rose_neigh_no++;
100 rose_neigh->restarted = 0;
101
102 skb_queue_head_init(&rose_neigh->queue);
103
104 timer_setup(&rose_neigh->ftimer, NULL, 0);
105 timer_setup(&rose_neigh->t0timer, NULL, 0);
106
107 if (rose_route->ndigis != 0) {
108 rose_neigh->digipeat =
109 kmalloc(sizeof(ax25_digi), GFP_ATOMIC);
110 if (rose_neigh->digipeat == NULL) {
111 kfree(rose_neigh);
112 res = -ENOMEM;
113 goto out;
114 }
115
116 rose_neigh->digipeat->ndigi = rose_route->ndigis;
117 rose_neigh->digipeat->lastrepeat = -1;
118
119 for (i = 0; i < rose_route->ndigis; i++) {
120 rose_neigh->digipeat->calls[i] =
121 rose_route->digipeaters[i];
122 rose_neigh->digipeat->repeated[i] = 0;
123 }
124 }
125
126 rose_neigh->next = rose_neigh_list;
127 rose_neigh_list = rose_neigh;
128 }
129
130 /*
131 * This is a new node to be inserted into the list. Find where it needs
132 * to be inserted into the list, and insert it. We want to be sure
133 * to order the list in descending order of mask size to ensure that
134 * later when we are searching this list the first match will be the
135 * best match.
136 */
137 if (rose_node == NULL) {
138 rose_tmpn = rose_node_list;
139 rose_tmpp = NULL;
140
141 while (rose_tmpn != NULL) {
142 if (rose_tmpn->mask > rose_route->mask) {
143 rose_tmpp = rose_tmpn;
144 rose_tmpn = rose_tmpn->next;
145 } else {
146 break;
147 }
148 }
149
150 /* create new node */
151 rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC);
152 if (rose_node == NULL) {
153 res = -ENOMEM;
154 goto out;
155 }
156
157 rose_node->address = rose_route->address;
158 rose_node->mask = rose_route->mask;
159 rose_node->count = 1;
160 rose_node->loopback = 0;
161 rose_node->neighbour[0] = rose_neigh;
162
163 if (rose_tmpn == NULL) {
164 if (rose_tmpp == NULL) { /* Empty list */
165 rose_node_list = rose_node;
166 rose_node->next = NULL;
167 } else {
168 rose_tmpp->next = rose_node;
169 rose_node->next = NULL;
170 }
171 } else {
172 if (rose_tmpp == NULL) { /* 1st node */
173 rose_node->next = rose_node_list;
174 rose_node_list = rose_node;
175 } else {
176 rose_tmpp->next = rose_node;
177 rose_node->next = rose_tmpn;
178 }
179 }
180 rose_neigh->count++;
181
182 goto out;
183 }
184
185 /* We have space, slot it in */
186 if (rose_node->count < 3) {
187 rose_node->neighbour[rose_node->count] = rose_neigh;
188 rose_node->count++;
189 rose_neigh->count++;
190 }
191
192 out:
193 spin_unlock_bh(&rose_neigh_list_lock);
194 spin_unlock_bh(&rose_node_list_lock);
195
196 return res;
197 }
198
199 /*
200 * Caller is holding rose_node_list_lock.
201 */
202 static void rose_remove_node(struct rose_node *rose_node)
203 {
204 struct rose_node *s;
205
206 if ((s = rose_node_list) == rose_node) {
207 rose_node_list = rose_node->next;
208 kfree(rose_node);
209 return;
210 }
211
212 while (s != NULL && s->next != NULL) {
213 if (s->next == rose_node) {
214 s->next = rose_node->next;
215 kfree(rose_node);
216 return;
217 }
218
219 s = s->next;
220 }
221 }
222
223 /*
224 * Caller is holding rose_neigh_list_lock.
225 */
226 static void rose_remove_neigh(struct rose_neigh *rose_neigh)
227 {
228 struct rose_neigh *s;
229
230 rose_stop_ftimer(rose_neigh);
231 rose_stop_t0timer(rose_neigh);
232
233 skb_queue_purge(&rose_neigh->queue);
234
235 if ((s = rose_neigh_list) == rose_neigh) {
236 rose_neigh_list = rose_neigh->next;
237 if (rose_neigh->ax25)
238 ax25_cb_put(rose_neigh->ax25);
239 kfree(rose_neigh->digipeat);
240 kfree(rose_neigh);
241 return;
242 }
243
244 while (s != NULL && s->next != NULL) {
245 if (s->next == rose_neigh) {
246 s->next = rose_neigh->next;
247 if (rose_neigh->ax25)
248 ax25_cb_put(rose_neigh->ax25);
249 kfree(rose_neigh->digipeat);
250 kfree(rose_neigh);
251 return;
252 }
253
254 s = s->next;
255 }
256 }
257
258 /*
259 * Caller is holding rose_route_list_lock.
260 */
261 static void rose_remove_route(struct rose_route *rose_route)
262 {
263 struct rose_route *s;
264
265 if (rose_route->neigh1 != NULL)
266 rose_route->neigh1->use--;
267
268 if (rose_route->neigh2 != NULL)
269 rose_route->neigh2->use--;
270
271 if ((s = rose_route_list) == rose_route) {
272 rose_route_list = rose_route->next;
273 kfree(rose_route);
274 return;
275 }
276
277 while (s != NULL && s->next != NULL) {
278 if (s->next == rose_route) {
279 s->next = rose_route->next;
280 kfree(rose_route);
281 return;
282 }
283
284 s = s->next;
285 }
286 }
287
288 /*
289 * "Delete" a node. Strictly speaking remove a route to a node. The node
290 * is only deleted if no routes are left to it.
291 */
292 static int rose_del_node(struct rose_route_struct *rose_route,
293 struct net_device *dev)
294 {
295 struct rose_node *rose_node;
296 struct rose_neigh *rose_neigh;
297 int i, err = 0;
298
299 spin_lock_bh(&rose_node_list_lock);
300 spin_lock_bh(&rose_neigh_list_lock);
301
302 rose_node = rose_node_list;
303 while (rose_node != NULL) {
304 if ((rose_node->mask == rose_route->mask) &&
305 (rosecmpm(&rose_route->address, &rose_node->address,
306 rose_route->mask) == 0))
307 break;
308 rose_node = rose_node->next;
309 }
310
311 if (rose_node == NULL || rose_node->loopback) {
312 err = -EINVAL;
313 goto out;
314 }
315
316 rose_neigh = rose_neigh_list;
317 while (rose_neigh != NULL) {
318 if (ax25cmp(&rose_route->neighbour,
319 &rose_neigh->callsign) == 0 &&
320 rose_neigh->dev == dev)
321 break;
322 rose_neigh = rose_neigh->next;
323 }
324
325 if (rose_neigh == NULL) {
326 err = -EINVAL;
327 goto out;
328 }
329
330 for (i = 0; i < rose_node->count; i++) {
331 if (rose_node->neighbour[i] == rose_neigh) {
332 rose_neigh->count--;
333
334 if (rose_neigh->count == 0 && rose_neigh->use == 0)
335 rose_remove_neigh(rose_neigh);
336
337 rose_node->count--;
338
339 if (rose_node->count == 0) {
340 rose_remove_node(rose_node);
341 } else {
342 switch (i) {
343 case 0:
344 rose_node->neighbour[0] =
345 rose_node->neighbour[1];
346 fallthrough;
347 case 1:
348 rose_node->neighbour[1] =
349 rose_node->neighbour[2];
350 case 2:
351 break;
352 }
353 }
354 goto out;
355 }
356 }
357 err = -EINVAL;
358
359 out:
360 spin_unlock_bh(&rose_neigh_list_lock);
361 spin_unlock_bh(&rose_node_list_lock);
362
363 return err;
364 }
365
366 /*
367 * Add the loopback neighbour.
368 */
369 void rose_add_loopback_neigh(void)
370 {
371 struct rose_neigh *sn;
372
373 rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL);
374 if (!rose_loopback_neigh)
375 return;
376 sn = rose_loopback_neigh;
377
378 sn->callsign = null_ax25_address;
379 sn->digipeat = NULL;
380 sn->ax25 = NULL;
381 sn->dev = NULL;
382 sn->count = 0;
383 sn->use = 0;
384 sn->dce_mode = 1;
385 sn->loopback = 1;
386 sn->number = rose_neigh_no++;
387 sn->restarted = 1;
388
389 skb_queue_head_init(&sn->queue);
390
391 timer_setup(&sn->ftimer, NULL, 0);
392 timer_setup(&sn->t0timer, NULL, 0);
393
394 spin_lock_bh(&rose_neigh_list_lock);
395 sn->next = rose_neigh_list;
396 rose_neigh_list = sn;
397 spin_unlock_bh(&rose_neigh_list_lock);
398 }
399
400 /*
401 * Add a loopback node.
402 */
403 int rose_add_loopback_node(rose_address *address)
404 {
405 struct rose_node *rose_node;
406 int err = 0;
407
408 spin_lock_bh(&rose_node_list_lock);
409
410 rose_node = rose_node_list;
411 while (rose_node != NULL) {
412 if ((rose_node->mask == 10) &&
413 (rosecmpm(address, &rose_node->address, 10) == 0) &&
414 rose_node->loopback)
415 break;
416 rose_node = rose_node->next;
417 }
418
419 if (rose_node != NULL)
420 goto out;
421
422 if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) {
423 err = -ENOMEM;
424 goto out;
425 }
426
427 rose_node->address = *address;
428 rose_node->mask = 10;
429 rose_node->count = 1;
430 rose_node->loopback = 1;
431 rose_node->neighbour[0] = rose_loopback_neigh;
432
433 /* Insert at the head of list. Address is always mask=10 */
434 rose_node->next = rose_node_list;
435 rose_node_list = rose_node;
436
437 rose_loopback_neigh->count++;
438
439 out:
440 spin_unlock_bh(&rose_node_list_lock);
441
442 return err;
443 }
444
445 /*
446 * Delete a loopback node.
447 */
448 void rose_del_loopback_node(rose_address *address)
449 {
450 struct rose_node *rose_node;
451
452 spin_lock_bh(&rose_node_list_lock);
453
454 rose_node = rose_node_list;
455 while (rose_node != NULL) {
456 if ((rose_node->mask == 10) &&
457 (rosecmpm(address, &rose_node->address, 10) == 0) &&
458 rose_node->loopback)
459 break;
460 rose_node = rose_node->next;
461 }
462
463 if (rose_node == NULL)
464 goto out;
465
466 rose_remove_node(rose_node);
467
468 rose_loopback_neigh->count--;
469
470 out:
471 spin_unlock_bh(&rose_node_list_lock);
472 }
473
474 /*
475 * A device has been removed. Remove its routes and neighbours.
476 */
477 void rose_rt_device_down(struct net_device *dev)
478 {
479 struct rose_neigh *s, *rose_neigh;
480 struct rose_node *t, *rose_node;
481 int i;
482
483 spin_lock_bh(&rose_node_list_lock);
484 spin_lock_bh(&rose_neigh_list_lock);
485 rose_neigh = rose_neigh_list;
486 while (rose_neigh != NULL) {
487 s = rose_neigh;
488 rose_neigh = rose_neigh->next;
489
490 if (s->dev != dev)
491 continue;
492
493 rose_node = rose_node_list;
494
495 while (rose_node != NULL) {
496 t = rose_node;
497 rose_node = rose_node->next;
498
499 for (i = 0; i < t->count; i++) {
500 if (t->neighbour[i] != s)
501 continue;
502
503 t->count--;
504
505 switch (i) {
506 case 0:
507 t->neighbour[0] = t->neighbour[1];
508 fallthrough;
509 case 1:
510 t->neighbour[1] = t->neighbour[2];
511 case 2:
512 break;
513 }
514 }
515
516 if (t->count <= 0)
517 rose_remove_node(t);
518 }
519
520 rose_remove_neigh(s);
521 }
522 spin_unlock_bh(&rose_neigh_list_lock);
523 spin_unlock_bh(&rose_node_list_lock);
524 }
525
526 #if 0 /* Currently unused */
527 /*
528 * A device has been removed. Remove its links.
529 */
530 void rose_route_device_down(struct net_device *dev)
531 {
532 struct rose_route *s, *rose_route;
533
534 spin_lock_bh(&rose_route_list_lock);
535 rose_route = rose_route_list;
536 while (rose_route != NULL) {
537 s = rose_route;
538 rose_route = rose_route->next;
539
540 if (s->neigh1->dev == dev || s->neigh2->dev == dev)
541 rose_remove_route(s);
542 }
543 spin_unlock_bh(&rose_route_list_lock);
544 }
545 #endif
546
547 /*
548 * Clear all nodes and neighbours out, except for neighbours with
549 * active connections going through them.
550 * Do not clear loopback neighbour and nodes.
551 */
552 static int rose_clear_routes(void)
553 {
554 struct rose_neigh *s, *rose_neigh;
555 struct rose_node *t, *rose_node;
556
557 spin_lock_bh(&rose_node_list_lock);
558 spin_lock_bh(&rose_neigh_list_lock);
559
560 rose_neigh = rose_neigh_list;
561 rose_node = rose_node_list;
562
563 while (rose_node != NULL) {
564 t = rose_node;
565 rose_node = rose_node->next;
566 if (!t->loopback)
567 rose_remove_node(t);
568 }
569
570 while (rose_neigh != NULL) {
571 s = rose_neigh;
572 rose_neigh = rose_neigh->next;
573
574 if (s->use == 0 && !s->loopback) {
575 s->count = 0;
576 rose_remove_neigh(s);
577 }
578 }
579
580 spin_unlock_bh(&rose_neigh_list_lock);
581 spin_unlock_bh(&rose_node_list_lock);
582
583 return 0;
584 }
585
586 /*
587 * Check that the device given is a valid AX.25 interface that is "up".
588 * called with RTNL
589 */
590 static struct net_device *rose_ax25_dev_find(char *devname)
591 {
592 struct net_device *dev;
593
594 if ((dev = __dev_get_by_name(&init_net, devname)) == NULL)
595 return NULL;
596
597 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
598 return dev;
599
600 return NULL;
601 }
602
603 /*
604 * Find the first active ROSE device, usually "rose0".
605 */
606 struct net_device *rose_dev_first(void)
607 {
608 struct net_device *dev, *first = NULL;
609
610 rcu_read_lock();
611 for_each_netdev_rcu(&init_net, dev) {
612 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE)
613 if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
614 first = dev;
615 }
616 rcu_read_unlock();
617
618 return first;
619 }
620
621 /*
622 * Find the ROSE device for the given address.
623 */
624 struct net_device *rose_dev_get(rose_address *addr)
625 {
626 struct net_device *dev;
627
628 rcu_read_lock();
629 for_each_netdev_rcu(&init_net, dev) {
630 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
631 dev_hold(dev);
632 goto out;
633 }
634 }
635 dev = NULL;
636 out:
637 rcu_read_unlock();
638 return dev;
639 }
640
641 static int rose_dev_exists(rose_address *addr)
642 {
643 struct net_device *dev;
644
645 rcu_read_lock();
646 for_each_netdev_rcu(&init_net, dev) {
647 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
648 goto out;
649 }
650 dev = NULL;
651 out:
652 rcu_read_unlock();
653 return dev != NULL;
654 }
655
656
657
658
659 struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh)
660 {
661 struct rose_route *rose_route;
662
663 for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next)
664 if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) ||
665 (rose_route->neigh2 == neigh && rose_route->lci2 == lci))
666 return rose_route;
667
668 return NULL;
669 }
670
671 /*
672 * Find a neighbour or a route given a ROSE address.
673 */
674 struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause,
675 unsigned char *diagnostic, int route_frame)
676 {
677 struct rose_neigh *res = NULL;
678 struct rose_node *node;
679 int failed = 0;
680 int i;
681
682 if (!route_frame) spin_lock_bh(&rose_node_list_lock);
683 for (node = rose_node_list; node != NULL; node = node->next) {
684 if (rosecmpm(addr, &node->address, node->mask) == 0) {
685 for (i = 0; i < node->count; i++) {
686 if (node->neighbour[i]->restarted) {
687 res = node->neighbour[i];
688 goto out;
689 }
690 }
691 }
692 }
693 if (!route_frame) { /* connect request */
694 for (node = rose_node_list; node != NULL; node = node->next) {
695 if (rosecmpm(addr, &node->address, node->mask) == 0) {
696 for (i = 0; i < node->count; i++) {
697 if (!rose_ftimer_running(node->neighbour[i])) {
698 res = node->neighbour[i];
699 goto out;
700 }
701 failed = 1;
702 }
703 }
704 }
705 }
706
707 if (failed) {
708 *cause = ROSE_OUT_OF_ORDER;
709 *diagnostic = 0;
710 } else {
711 *cause = ROSE_NOT_OBTAINABLE;
712 *diagnostic = 0;
713 }
714
715 out:
716 if (!route_frame) spin_unlock_bh(&rose_node_list_lock);
717 return res;
718 }
719
720 /*
721 * Handle the ioctls that control the routing functions.
722 */
723 int rose_rt_ioctl(unsigned int cmd, void __user *arg)
724 {
725 struct rose_route_struct rose_route;
726 struct net_device *dev;
727 int err;
728
729 switch (cmd) {
730 case SIOCADDRT:
731 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
732 return -EFAULT;
733 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
734 return -EINVAL;
735 if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */
736 return -EINVAL;
737 if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
738 return -EINVAL;
739 if (rose_route.ndigis > AX25_MAX_DIGIS)
740 return -EINVAL;
741 err = rose_add_node(&rose_route, dev);
742 return err;
743
744 case SIOCDELRT:
745 if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
746 return -EFAULT;
747 if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
748 return -EINVAL;
749 err = rose_del_node(&rose_route, dev);
750 return err;
751
752 case SIOCRSCLRRT:
753 return rose_clear_routes();
754
755 default:
756 return -EINVAL;
757 }
758
759 return 0;
760 }
761
762 static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh)
763 {
764 struct rose_route *rose_route, *s;
765
766 rose_neigh->restarted = 0;
767
768 rose_stop_t0timer(rose_neigh);
769 rose_start_ftimer(rose_neigh);
770
771 skb_queue_purge(&rose_neigh->queue);
772
773 spin_lock_bh(&rose_route_list_lock);
774
775 rose_route = rose_route_list;
776
777 while (rose_route != NULL) {
778 if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) ||
779 (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) ||
780 (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) {
781 s = rose_route->next;
782 rose_remove_route(rose_route);
783 rose_route = s;
784 continue;
785 }
786
787 if (rose_route->neigh1 == rose_neigh) {
788 rose_route->neigh1->use--;
789 rose_route->neigh1 = NULL;
790 rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0);
791 }
792
793 if (rose_route->neigh2 == rose_neigh) {
794 rose_route->neigh2->use--;
795 rose_route->neigh2 = NULL;
796 rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0);
797 }
798
799 rose_route = rose_route->next;
800 }
801 spin_unlock_bh(&rose_route_list_lock);
802 }
803
804 /*
805 * A level 2 link has timed out, therefore it appears to be a poor link,
806 * then don't use that neighbour until it is reset. Blow away all through
807 * routes and connections using this route.
808 */
809 void rose_link_failed(ax25_cb *ax25, int reason)
810 {
811 struct rose_neigh *rose_neigh;
812
813 spin_lock_bh(&rose_neigh_list_lock);
814 rose_neigh = rose_neigh_list;
815 while (rose_neigh != NULL) {
816 if (rose_neigh->ax25 == ax25)
817 break;
818 rose_neigh = rose_neigh->next;
819 }
820
821 if (rose_neigh != NULL) {
822 rose_neigh->ax25 = NULL;
823 ax25_cb_put(ax25);
824
825 rose_del_route_by_neigh(rose_neigh);
826 rose_kill_by_neigh(rose_neigh);
827 }
828 spin_unlock_bh(&rose_neigh_list_lock);
829 }
830
831 /*
832 * A device has been "downed" remove its link status. Blow away all
833 * through routes and connections that use this device.
834 */
835 void rose_link_device_down(struct net_device *dev)
836 {
837 struct rose_neigh *rose_neigh;
838
839 for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) {
840 if (rose_neigh->dev == dev) {
841 rose_del_route_by_neigh(rose_neigh);
842 rose_kill_by_neigh(rose_neigh);
843 }
844 }
845 }
846
847 /*
848 * Route a frame to an appropriate AX.25 connection.
849 * A NULL ax25_cb indicates an internally generated frame.
850 */
851 int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
852 {
853 struct rose_neigh *rose_neigh, *new_neigh;
854 struct rose_route *rose_route;
855 struct rose_facilities_struct facilities;
856 rose_address *src_addr, *dest_addr;
857 struct sock *sk;
858 unsigned short frametype;
859 unsigned int lci, new_lci;
860 unsigned char cause, diagnostic;
861 struct net_device *dev;
862 int res = 0;
863 char buf[11];
864
865 if (skb->len < ROSE_MIN_LEN)
866 return res;
867
868 if (!ax25)
869 return rose_loopback_queue(skb, NULL);
870
871 frametype = skb->data[2];
872 lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF);
873 if (frametype == ROSE_CALL_REQUEST &&
874 (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF ||
875 skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] !=
876 ROSE_CALL_REQ_ADDR_LEN_VAL))
877 return res;
878 src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF);
879 dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF);
880
881 spin_lock_bh(&rose_neigh_list_lock);
882 spin_lock_bh(&rose_route_list_lock);
883
884 rose_neigh = rose_neigh_list;
885 while (rose_neigh != NULL) {
886 if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 &&
887 ax25->ax25_dev->dev == rose_neigh->dev)
888 break;
889 rose_neigh = rose_neigh->next;
890 }
891
892 if (rose_neigh == NULL) {
893 printk("rose_route : unknown neighbour or device %s\n",
894 ax2asc(buf, &ax25->dest_addr));
895 goto out;
896 }
897
898 /*
899 * Obviously the link is working, halt the ftimer.
900 */
901 rose_stop_ftimer(rose_neigh);
902
903 /*
904 * LCI of zero is always for us, and its always a restart
905 * frame.
906 */
907 if (lci == 0) {
908 rose_link_rx_restart(skb, rose_neigh, frametype);
909 goto out;
910 }
911
912 /*
913 * Find an existing socket.
914 */
915 if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) {
916 if (frametype == ROSE_CALL_REQUEST) {
917 struct rose_sock *rose = rose_sk(sk);
918
919 /* Remove an existing unused socket */
920 rose_clear_queues(sk);
921 rose->cause = ROSE_NETWORK_CONGESTION;
922 rose->diagnostic = 0;
923 rose->neighbour->use--;
924 rose->neighbour = NULL;
925 rose->lci = 0;
926 rose->state = ROSE_STATE_0;
927 sk->sk_state = TCP_CLOSE;
928 sk->sk_err = 0;
929 sk->sk_shutdown |= SEND_SHUTDOWN;
930 if (!sock_flag(sk, SOCK_DEAD)) {
931 sk->sk_state_change(sk);
932 sock_set_flag(sk, SOCK_DEAD);
933 }
934 }
935 else {
936 skb_reset_transport_header(skb);
937 res = rose_process_rx_frame(sk, skb);
938 goto out;
939 }
940 }
941
942 /*
943 * Is is a Call Request and is it for us ?
944 */
945 if (frametype == ROSE_CALL_REQUEST)
946 if ((dev = rose_dev_get(dest_addr)) != NULL) {
947 res = rose_rx_call_request(skb, dev, rose_neigh, lci);
948 dev_put(dev);
949 goto out;
950 }
951
952 if (!sysctl_rose_routing_control) {
953 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0);
954 goto out;
955 }
956
957 /*
958 * Route it to the next in line if we have an entry for it.
959 */
960 rose_route = rose_route_list;
961 while (rose_route != NULL) {
962 if (rose_route->lci1 == lci &&
963 rose_route->neigh1 == rose_neigh) {
964 if (frametype == ROSE_CALL_REQUEST) {
965 /* F6FBB - Remove an existing unused route */
966 rose_remove_route(rose_route);
967 break;
968 } else if (rose_route->neigh2 != NULL) {
969 skb->data[0] &= 0xF0;
970 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
971 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
972 rose_transmit_link(skb, rose_route->neigh2);
973 if (frametype == ROSE_CLEAR_CONFIRMATION)
974 rose_remove_route(rose_route);
975 res = 1;
976 goto out;
977 } else {
978 if (frametype == ROSE_CLEAR_CONFIRMATION)
979 rose_remove_route(rose_route);
980 goto out;
981 }
982 }
983 if (rose_route->lci2 == lci &&
984 rose_route->neigh2 == rose_neigh) {
985 if (frametype == ROSE_CALL_REQUEST) {
986 /* F6FBB - Remove an existing unused route */
987 rose_remove_route(rose_route);
988 break;
989 } else if (rose_route->neigh1 != NULL) {
990 skb->data[0] &= 0xF0;
991 skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F;
992 skb->data[1] = (rose_route->lci1 >> 0) & 0xFF;
993 rose_transmit_link(skb, rose_route->neigh1);
994 if (frametype == ROSE_CLEAR_CONFIRMATION)
995 rose_remove_route(rose_route);
996 res = 1;
997 goto out;
998 } else {
999 if (frametype == ROSE_CLEAR_CONFIRMATION)
1000 rose_remove_route(rose_route);
1001 goto out;
1002 }
1003 }
1004 rose_route = rose_route->next;
1005 }
1006
1007 /*
1008 * We know that:
1009 * 1. The frame isn't for us,
1010 * 2. It isn't "owned" by any existing route.
1011 */
1012 if (frametype != ROSE_CALL_REQUEST) { /* XXX */
1013 res = 0;
1014 goto out;
1015 }
1016
1017 memset(&facilities, 0x00, sizeof(struct rose_facilities_struct));
1018
1019 if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF,
1020 skb->len - ROSE_CALL_REQ_FACILITIES_OFF,
1021 &facilities)) {
1022 rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76);
1023 goto out;
1024 }
1025
1026 /*
1027 * Check for routing loops.
1028 */
1029 rose_route = rose_route_list;
1030 while (rose_route != NULL) {
1031 if (rose_route->rand == facilities.rand &&
1032 rosecmp(src_addr, &rose_route->src_addr) == 0 &&
1033 ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 &&
1034 ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) {
1035 rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120);
1036 goto out;
1037 }
1038 rose_route = rose_route->next;
1039 }
1040
1041 if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) {
1042 rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic);
1043 goto out;
1044 }
1045
1046 if ((new_lci = rose_new_lci(new_neigh)) == 0) {
1047 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71);
1048 goto out;
1049 }
1050
1051 if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) {
1052 rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120);
1053 goto out;
1054 }
1055
1056 rose_route->lci1 = lci;
1057 rose_route->src_addr = *src_addr;
1058 rose_route->dest_addr = *dest_addr;
1059 rose_route->src_call = facilities.dest_call;
1060 rose_route->dest_call = facilities.source_call;
1061 rose_route->rand = facilities.rand;
1062 rose_route->neigh1 = rose_neigh;
1063 rose_route->lci2 = new_lci;
1064 rose_route->neigh2 = new_neigh;
1065
1066 rose_route->neigh1->use++;
1067 rose_route->neigh2->use++;
1068
1069 rose_route->next = rose_route_list;
1070 rose_route_list = rose_route;
1071
1072 skb->data[0] &= 0xF0;
1073 skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F;
1074 skb->data[1] = (rose_route->lci2 >> 0) & 0xFF;
1075
1076 rose_transmit_link(skb, rose_route->neigh2);
1077 res = 1;
1078
1079 out:
1080 spin_unlock_bh(&rose_route_list_lock);
1081 spin_unlock_bh(&rose_neigh_list_lock);
1082
1083 return res;
1084 }
1085
1086 #ifdef CONFIG_PROC_FS
1087
1088 static void *rose_node_start(struct seq_file *seq, loff_t *pos)
1089 __acquires(rose_node_list_lock)
1090 {
1091 struct rose_node *rose_node;
1092 int i = 1;
1093
1094 spin_lock_bh(&rose_node_list_lock);
1095 if (*pos == 0)
1096 return SEQ_START_TOKEN;
1097
1098 for (rose_node = rose_node_list; rose_node && i < *pos;
1099 rose_node = rose_node->next, ++i);
1100
1101 return (i == *pos) ? rose_node : NULL;
1102 }
1103
1104 static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos)
1105 {
1106 ++*pos;
1107
1108 return (v == SEQ_START_TOKEN) ? rose_node_list
1109 : ((struct rose_node *)v)->next;
1110 }
1111
1112 static void rose_node_stop(struct seq_file *seq, void *v)
1113 __releases(rose_node_list_lock)
1114 {
1115 spin_unlock_bh(&rose_node_list_lock);
1116 }
1117
1118 static int rose_node_show(struct seq_file *seq, void *v)
1119 {
1120 char rsbuf[11];
1121 int i;
1122
1123 if (v == SEQ_START_TOKEN)
1124 seq_puts(seq, "address mask n neigh neigh neigh\n");
1125 else {
1126 const struct rose_node *rose_node = v;
1127 /* if (rose_node->loopback) {
1128 seq_printf(seq, "%-10s %04d 1 loopback\n",
1129 rose2asc(rsbuf, &rose_node->address),
1130 rose_node->mask);
1131 } else { */
1132 seq_printf(seq, "%-10s %04d %d",
1133 rose2asc(rsbuf, &rose_node->address),
1134 rose_node->mask,
1135 rose_node->count);
1136
1137 for (i = 0; i < rose_node->count; i++)
1138 seq_printf(seq, " %05d",
1139 rose_node->neighbour[i]->number);
1140
1141 seq_puts(seq, "\n");
1142 /* } */
1143 }
1144 return 0;
1145 }
1146
1147 const struct seq_operations rose_node_seqops = {
1148 .start = rose_node_start,
1149 .next = rose_node_next,
1150 .stop = rose_node_stop,
1151 .show = rose_node_show,
1152 };
1153
1154 static void *rose_neigh_start(struct seq_file *seq, loff_t *pos)
1155 __acquires(rose_neigh_list_lock)
1156 {
1157 struct rose_neigh *rose_neigh;
1158 int i = 1;
1159
1160 spin_lock_bh(&rose_neigh_list_lock);
1161 if (*pos == 0)
1162 return SEQ_START_TOKEN;
1163
1164 for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos;
1165 rose_neigh = rose_neigh->next, ++i);
1166
1167 return (i == *pos) ? rose_neigh : NULL;
1168 }
1169
1170 static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
1171 {
1172 ++*pos;
1173
1174 return (v == SEQ_START_TOKEN) ? rose_neigh_list
1175 : ((struct rose_neigh *)v)->next;
1176 }
1177
1178 static void rose_neigh_stop(struct seq_file *seq, void *v)
1179 __releases(rose_neigh_list_lock)
1180 {
1181 spin_unlock_bh(&rose_neigh_list_lock);
1182 }
1183
1184 static int rose_neigh_show(struct seq_file *seq, void *v)
1185 {
1186 char buf[11];
1187 int i;
1188
1189 if (v == SEQ_START_TOKEN)
1190 seq_puts(seq,
1191 "addr callsign dev count use mode restart t0 tf digipeaters\n");
1192 else {
1193 struct rose_neigh *rose_neigh = v;
1194
1195 /* if (!rose_neigh->loopback) { */
1196 seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu",
1197 rose_neigh->number,
1198 (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
1199 rose_neigh->dev ? rose_neigh->dev->name : "???",
1200 rose_neigh->count,
1201 rose_neigh->use,
1202 (rose_neigh->dce_mode) ? "DCE" : "DTE",
1203 (rose_neigh->restarted) ? "yes" : "no",
1204 ax25_display_timer(&rose_neigh->t0timer) / HZ,
1205 ax25_display_timer(&rose_neigh->ftimer) / HZ);
1206
1207 if (rose_neigh->digipeat != NULL) {
1208 for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
1209 seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
1210 }
1211
1212 seq_puts(seq, "\n");
1213 }
1214 return 0;
1215 }
1216
1217
1218 const struct seq_operations rose_neigh_seqops = {
1219 .start = rose_neigh_start,
1220 .next = rose_neigh_next,
1221 .stop = rose_neigh_stop,
1222 .show = rose_neigh_show,
1223 };
1224
1225 static void *rose_route_start(struct seq_file *seq, loff_t *pos)
1226 __acquires(rose_route_list_lock)
1227 {
1228 struct rose_route *rose_route;
1229 int i = 1;
1230
1231 spin_lock_bh(&rose_route_list_lock);
1232 if (*pos == 0)
1233 return SEQ_START_TOKEN;
1234
1235 for (rose_route = rose_route_list; rose_route && i < *pos;
1236 rose_route = rose_route->next, ++i);
1237
1238 return (i == *pos) ? rose_route : NULL;
1239 }
1240
1241 static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos)
1242 {
1243 ++*pos;
1244
1245 return (v == SEQ_START_TOKEN) ? rose_route_list
1246 : ((struct rose_route *)v)->next;
1247 }
1248
1249 static void rose_route_stop(struct seq_file *seq, void *v)
1250 __releases(rose_route_list_lock)
1251 {
1252 spin_unlock_bh(&rose_route_list_lock);
1253 }
1254
1255 static int rose_route_show(struct seq_file *seq, void *v)
1256 {
1257 char buf[11], rsbuf[11];
1258
1259 if (v == SEQ_START_TOKEN)
1260 seq_puts(seq,
1261 "lci address callsign neigh <-> lci address callsign neigh\n");
1262 else {
1263 struct rose_route *rose_route = v;
1264
1265 if (rose_route->neigh1)
1266 seq_printf(seq,
1267 "%3.3X %-10s %-9s %05d ",
1268 rose_route->lci1,
1269 rose2asc(rsbuf, &rose_route->src_addr),
1270 ax2asc(buf, &rose_route->src_call),
1271 rose_route->neigh1->number);
1272 else
1273 seq_puts(seq,
1274 "000 * * 00000 ");
1275
1276 if (rose_route->neigh2)
1277 seq_printf(seq,
1278 "%3.3X %-10s %-9s %05d\n",
1279 rose_route->lci2,
1280 rose2asc(rsbuf, &rose_route->dest_addr),
1281 ax2asc(buf, &rose_route->dest_call),
1282 rose_route->neigh2->number);
1283 else
1284 seq_puts(seq,
1285 "000 * * 00000\n");
1286 }
1287 return 0;
1288 }
1289
1290 struct seq_operations rose_route_seqops = {
1291 .start = rose_route_start,
1292 .next = rose_route_next,
1293 .stop = rose_route_stop,
1294 .show = rose_route_show,
1295 };
1296 #endif /* CONFIG_PROC_FS */
1297
1298 /*
1299 * Release all memory associated with ROSE routing structures.
1300 */
1301 void __exit rose_rt_free(void)
1302 {
1303 struct rose_neigh *s, *rose_neigh = rose_neigh_list;
1304 struct rose_node *t, *rose_node = rose_node_list;
1305 struct rose_route *u, *rose_route = rose_route_list;
1306
1307 while (rose_neigh != NULL) {
1308 s = rose_neigh;
1309 rose_neigh = rose_neigh->next;
1310
1311 rose_remove_neigh(s);
1312 }
1313
1314 while (rose_node != NULL) {
1315 t = rose_node;
1316 rose_node = rose_node->next;
1317
1318 rose_remove_node(t);
1319 }
1320
1321 while (rose_route != NULL) {
1322 u = rose_route;
1323 rose_route = rose_route->next;
1324
1325 rose_remove_route(u);
1326 }
1327 }
Linux with added FPC-III support