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exec: do not sleep in TASK_TRACED under ->cred_guard_mutex
[linux-2.6/mini2440.git] / net / netrom / nr_route.c
blob4eb1ac9a7679ca3c14c0d9c651fbbf1d4fe76694
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 Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
9 * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi)
10 */
11 #include <linux/errno.h>
12 #include <linux/types.h>
13 #include <linux/socket.h>
14 #include <linux/in.h>
15 #include <linux/kernel.h>
16 #include <linux/timer.h>
17 #include <linux/string.h>
18 #include <linux/sockios.h>
19 #include <linux/net.h>
20 #include <net/ax25.h>
21 #include <linux/inet.h>
22 #include <linux/netdevice.h>
23 #include <net/arp.h>
24 #include <linux/if_arp.h>
25 #include <linux/skbuff.h>
26 #include <net/sock.h>
27 #include <asm/uaccess.h>
28 #include <asm/system.h>
29 #include <linux/fcntl.h>
30 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
31 #include <linux/mm.h>
32 #include <linux/interrupt.h>
33 #include <linux/notifier.h>
34 #include <linux/netfilter.h>
35 #include <linux/init.h>
36 #include <linux/spinlock.h>
37 #include <net/netrom.h>
38 #include <linux/seq_file.h>
39
40 static unsigned int nr_neigh_no = 1;
41
42 static HLIST_HEAD(nr_node_list);
43 static DEFINE_SPINLOCK(nr_node_list_lock);
44 static HLIST_HEAD(nr_neigh_list);
45 static DEFINE_SPINLOCK(nr_neigh_list_lock);
46
47 static struct nr_node *nr_node_get(ax25_address *callsign)
48 {
49 struct nr_node *found = NULL;
50 struct nr_node *nr_node;
51 struct hlist_node *node;
52
53 spin_lock_bh(&nr_node_list_lock);
54 nr_node_for_each(nr_node, node, &nr_node_list)
55 if (ax25cmp(callsign, &nr_node->callsign) == 0) {
56 nr_node_hold(nr_node);
57 found = nr_node;
58 break;
59 }
60 spin_unlock_bh(&nr_node_list_lock);
61 return found;
62 }
63
64 static struct nr_neigh *nr_neigh_get_dev(ax25_address *callsign,
65 struct net_device *dev)
66 {
67 struct nr_neigh *found = NULL;
68 struct nr_neigh *nr_neigh;
69 struct hlist_node *node;
70
71 spin_lock_bh(&nr_neigh_list_lock);
72 nr_neigh_for_each(nr_neigh, node, &nr_neigh_list)
73 if (ax25cmp(callsign, &nr_neigh->callsign) == 0 &&
74 nr_neigh->dev == dev) {
75 nr_neigh_hold(nr_neigh);
76 found = nr_neigh;
77 break;
78 }
79 spin_unlock_bh(&nr_neigh_list_lock);
80 return found;
81 }
82
83 static void nr_remove_neigh(struct nr_neigh *);
84
85 /*
86 * Add a new route to a node, and in the process add the node and the
87 * neighbour if it is new.
88 */
89 static int __must_check nr_add_node(ax25_address *nr, const char *mnemonic,
90 ax25_address *ax25, ax25_digi *ax25_digi, struct net_device *dev,
91 int quality, int obs_count)
92 {
93 struct nr_node *nr_node;
94 struct nr_neigh *nr_neigh;
95 struct nr_route nr_route;
96 int i, found;
97 struct net_device *odev;
98
99 if ((odev=nr_dev_get(nr)) != NULL) { /* Can't add routes to ourself */
100 dev_put(odev);
101 return -EINVAL;
102 }
103
104 nr_node = nr_node_get(nr);
105
106 nr_neigh = nr_neigh_get_dev(ax25, dev);
107
108 /*
109 * The L2 link to a neighbour has failed in the past
110 * and now a frame comes from this neighbour. We assume
111 * it was a temporary trouble with the link and reset the
112 * routes now (and not wait for a node broadcast).
113 */
114 if (nr_neigh != NULL && nr_neigh->failed != 0 && quality == 0) {
115 struct nr_node *nr_nodet;
116 struct hlist_node *node;
117
118 spin_lock_bh(&nr_node_list_lock);
119 nr_node_for_each(nr_nodet, node, &nr_node_list) {
120 nr_node_lock(nr_nodet);
121 for (i = 0; i < nr_nodet->count; i++)
122 if (nr_nodet->routes[i].neighbour == nr_neigh)
123 if (i < nr_nodet->which)
124 nr_nodet->which = i;
125 nr_node_unlock(nr_nodet);
126 }
127 spin_unlock_bh(&nr_node_list_lock);
128 }
129
130 if (nr_neigh != NULL)
131 nr_neigh->failed = 0;
132
133 if (quality == 0 && nr_neigh != NULL && nr_node != NULL) {
134 nr_neigh_put(nr_neigh);
135 nr_node_put(nr_node);
136 return 0;
137 }
138
139 if (nr_neigh == NULL) {
140 if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL) {
141 if (nr_node)
142 nr_node_put(nr_node);
143 return -ENOMEM;
144 }
145
146 nr_neigh->callsign = *ax25;
147 nr_neigh->digipeat = NULL;
148 nr_neigh->ax25 = NULL;
149 nr_neigh->dev = dev;
150 nr_neigh->quality = sysctl_netrom_default_path_quality;
151 nr_neigh->locked = 0;
152 nr_neigh->count = 0;
153 nr_neigh->number = nr_neigh_no++;
154 nr_neigh->failed = 0;
155 atomic_set(&nr_neigh->refcount, 1);
156
157 if (ax25_digi != NULL && ax25_digi->ndigi > 0) {
158 nr_neigh->digipeat = kmemdup(ax25_digi,
159 sizeof(*ax25_digi),
160 GFP_KERNEL);
161 if (nr_neigh->digipeat == NULL) {
162 kfree(nr_neigh);
163 if (nr_node)
164 nr_node_put(nr_node);
165 return -ENOMEM;
166 }
167 }
168
169 spin_lock_bh(&nr_neigh_list_lock);
170 hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list);
171 nr_neigh_hold(nr_neigh);
172 spin_unlock_bh(&nr_neigh_list_lock);
173 }
174
175 if (quality != 0 && ax25cmp(nr, ax25) == 0 && !nr_neigh->locked)
176 nr_neigh->quality = quality;
177
178 if (nr_node == NULL) {
179 if ((nr_node = kmalloc(sizeof(*nr_node), GFP_ATOMIC)) == NULL) {
180 if (nr_neigh)
181 nr_neigh_put(nr_neigh);
182 return -ENOMEM;
183 }
184
185 nr_node->callsign = *nr;
186 strcpy(nr_node->mnemonic, mnemonic);
187
188 nr_node->which = 0;
189 nr_node->count = 1;
190 atomic_set(&nr_node->refcount, 1);
191 spin_lock_init(&nr_node->node_lock);
192
193 nr_node->routes[0].quality = quality;
194 nr_node->routes[0].obs_count = obs_count;
195 nr_node->routes[0].neighbour = nr_neigh;
196
197 nr_neigh_hold(nr_neigh);
198 nr_neigh->count++;
199
200 spin_lock_bh(&nr_node_list_lock);
201 hlist_add_head(&nr_node->node_node, &nr_node_list);
202 /* refcount initialized at 1 */
203 spin_unlock_bh(&nr_node_list_lock);
204
205 return 0;
206 }
207 nr_node_lock(nr_node);
208
209 if (quality != 0)
210 strcpy(nr_node->mnemonic, mnemonic);
211
212 for (found = 0, i = 0; i < nr_node->count; i++) {
213 if (nr_node->routes[i].neighbour == nr_neigh) {
214 nr_node->routes[i].quality = quality;
215 nr_node->routes[i].obs_count = obs_count;
216 found = 1;
217 break;
218 }
219 }
220
221 if (!found) {
222 /* We have space at the bottom, slot it in */
223 if (nr_node->count < 3) {
224 nr_node->routes[2] = nr_node->routes[1];
225 nr_node->routes[1] = nr_node->routes[0];
226
227 nr_node->routes[0].quality = quality;
228 nr_node->routes[0].obs_count = obs_count;
229 nr_node->routes[0].neighbour = nr_neigh;
230
231 nr_node->which++;
232 nr_node->count++;
233 nr_neigh_hold(nr_neigh);
234 nr_neigh->count++;
235 } else {
236 /* It must be better than the worst */
237 if (quality > nr_node->routes[2].quality) {
238 nr_node->routes[2].neighbour->count--;
239 nr_neigh_put(nr_node->routes[2].neighbour);
240
241 if (nr_node->routes[2].neighbour->count == 0 && !nr_node->routes[2].neighbour->locked)
242 nr_remove_neigh(nr_node->routes[2].neighbour);
243
244 nr_node->routes[2].quality = quality;
245 nr_node->routes[2].obs_count = obs_count;
246 nr_node->routes[2].neighbour = nr_neigh;
247
248 nr_neigh_hold(nr_neigh);
249 nr_neigh->count++;
250 }
251 }
252 }
253
254 /* Now re-sort the routes in quality order */
255 switch (nr_node->count) {
256 case 3:
257 if (nr_node->routes[1].quality > nr_node->routes[0].quality) {
258 switch (nr_node->which) {
259 case 0: nr_node->which = 1; break;
260 case 1: nr_node->which = 0; break;
261 default: break;
262 }
263 nr_route = nr_node->routes[0];
264 nr_node->routes[0] = nr_node->routes[1];
265 nr_node->routes[1] = nr_route;
266 }
267 if (nr_node->routes[2].quality > nr_node->routes[1].quality) {
268 switch (nr_node->which) {
269 case 1: nr_node->which = 2;
270 break;
271
272 case 2: nr_node->which = 1;
273 break;
274
275 default:
276 break;
277 }
278 nr_route = nr_node->routes[1];
279 nr_node->routes[1] = nr_node->routes[2];
280 nr_node->routes[2] = nr_route;
281 }
282 case 2:
283 if (nr_node->routes[1].quality > nr_node->routes[0].quality) {
284 switch (nr_node->which) {
285 case 0: nr_node->which = 1;
286 break;
287
288 case 1: nr_node->which = 0;
289 break;
290
291 default: break;
292 }
293 nr_route = nr_node->routes[0];
294 nr_node->routes[0] = nr_node->routes[1];
295 nr_node->routes[1] = nr_route;
296 }
297 case 1:
298 break;
299 }
300
301 for (i = 0; i < nr_node->count; i++) {
302 if (nr_node->routes[i].neighbour == nr_neigh) {
303 if (i < nr_node->which)
304 nr_node->which = i;
305 break;
306 }
307 }
308
309 nr_neigh_put(nr_neigh);
310 nr_node_unlock(nr_node);
311 nr_node_put(nr_node);
312 return 0;
313 }
314
315 static inline void __nr_remove_node(struct nr_node *nr_node)
316 {
317 hlist_del_init(&nr_node->node_node);
318 nr_node_put(nr_node);
319 }
320
321 #define nr_remove_node_locked(__node) \
322 __nr_remove_node(__node)
323
324 static void nr_remove_node(struct nr_node *nr_node)
325 {
326 spin_lock_bh(&nr_node_list_lock);
327 __nr_remove_node(nr_node);
328 spin_unlock_bh(&nr_node_list_lock);
329 }
330
331 static inline void __nr_remove_neigh(struct nr_neigh *nr_neigh)
332 {
333 hlist_del_init(&nr_neigh->neigh_node);
334 nr_neigh_put(nr_neigh);
335 }
336
337 #define nr_remove_neigh_locked(__neigh) \
338 __nr_remove_neigh(__neigh)
339
340 static void nr_remove_neigh(struct nr_neigh *nr_neigh)
341 {
342 spin_lock_bh(&nr_neigh_list_lock);
343 __nr_remove_neigh(nr_neigh);
344 spin_unlock_bh(&nr_neigh_list_lock);
345 }
346
347 /*
348 * "Delete" a node. Strictly speaking remove a route to a node. The node
349 * is only deleted if no routes are left to it.
350 */
351 static int nr_del_node(ax25_address *callsign, ax25_address *neighbour, struct net_device *dev)
352 {
353 struct nr_node *nr_node;
354 struct nr_neigh *nr_neigh;
355 int i;
356
357 nr_node = nr_node_get(callsign);
358
359 if (nr_node == NULL)
360 return -EINVAL;
361
362 nr_neigh = nr_neigh_get_dev(neighbour, dev);
363
364 if (nr_neigh == NULL) {
365 nr_node_put(nr_node);
366 return -EINVAL;
367 }
368
369 nr_node_lock(nr_node);
370 for (i = 0; i < nr_node->count; i++) {
371 if (nr_node->routes[i].neighbour == nr_neigh) {
372 nr_neigh->count--;
373 nr_neigh_put(nr_neigh);
374
375 if (nr_neigh->count == 0 && !nr_neigh->locked)
376 nr_remove_neigh(nr_neigh);
377 nr_neigh_put(nr_neigh);
378
379 nr_node->count--;
380
381 if (nr_node->count == 0) {
382 nr_remove_node(nr_node);
383 } else {
384 switch (i) {
385 case 0:
386 nr_node->routes[0] = nr_node->routes[1];
387 case 1:
388 nr_node->routes[1] = nr_node->routes[2];
389 case 2:
390 break;
391 }
392 nr_node_put(nr_node);
393 }
394 nr_node_unlock(nr_node);
395
396 return 0;
397 }
398 }
399 nr_neigh_put(nr_neigh);
400 nr_node_unlock(nr_node);
401 nr_node_put(nr_node);
402
403 return -EINVAL;
404 }
405
406 /*
407 * Lock a neighbour with a quality.
408 */
409 static int __must_check nr_add_neigh(ax25_address *callsign,
410 ax25_digi *ax25_digi, struct net_device *dev, unsigned int quality)
411 {
412 struct nr_neigh *nr_neigh;
413
414 nr_neigh = nr_neigh_get_dev(callsign, dev);
415 if (nr_neigh) {
416 nr_neigh->quality = quality;
417 nr_neigh->locked = 1;
418 nr_neigh_put(nr_neigh);
419 return 0;
420 }
421
422 if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL)
423 return -ENOMEM;
424
425 nr_neigh->callsign = *callsign;
426 nr_neigh->digipeat = NULL;
427 nr_neigh->ax25 = NULL;
428 nr_neigh->dev = dev;
429 nr_neigh->quality = quality;
430 nr_neigh->locked = 1;
431 nr_neigh->count = 0;
432 nr_neigh->number = nr_neigh_no++;
433 nr_neigh->failed = 0;
434 atomic_set(&nr_neigh->refcount, 1);
435
436 if (ax25_digi != NULL && ax25_digi->ndigi > 0) {
437 nr_neigh->digipeat = kmemdup(ax25_digi, sizeof(*ax25_digi),
438 GFP_KERNEL);
439 if (nr_neigh->digipeat == NULL) {
440 kfree(nr_neigh);
441 return -ENOMEM;
442 }
443 }
444
445 spin_lock_bh(&nr_neigh_list_lock);
446 hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list);
447 /* refcount is initialized at 1 */
448 spin_unlock_bh(&nr_neigh_list_lock);
449
450 return 0;
451 }
452
453 /*
454 * "Delete" a neighbour. The neighbour is only removed if the number
455 * of nodes that may use it is zero.
456 */
457 static int nr_del_neigh(ax25_address *callsign, struct net_device *dev, unsigned int quality)
458 {
459 struct nr_neigh *nr_neigh;
460
461 nr_neigh = nr_neigh_get_dev(callsign, dev);
462
463 if (nr_neigh == NULL) return -EINVAL;
464
465 nr_neigh->quality = quality;
466 nr_neigh->locked = 0;
467
468 if (nr_neigh->count == 0)
469 nr_remove_neigh(nr_neigh);
470 nr_neigh_put(nr_neigh);
471
472 return 0;
473 }
474
475 /*
476 * Decrement the obsolescence count by one. If a route is reduced to a
477 * count of zero, remove it. Also remove any unlocked neighbours with
478 * zero nodes routing via it.
479 */
480 static int nr_dec_obs(void)
481 {
482 struct nr_neigh *nr_neigh;
483 struct nr_node *s;
484 struct hlist_node *node, *nodet;
485 int i;
486
487 spin_lock_bh(&nr_node_list_lock);
488 nr_node_for_each_safe(s, node, nodet, &nr_node_list) {
489 nr_node_lock(s);
490 for (i = 0; i < s->count; i++) {
491 switch (s->routes[i].obs_count) {
492 case 0: /* A locked entry */
493 break;
494
495 case 1: /* From 1 -> 0 */
496 nr_neigh = s->routes[i].neighbour;
497
498 nr_neigh->count--;
499 nr_neigh_put(nr_neigh);
500
501 if (nr_neigh->count == 0 && !nr_neigh->locked)
502 nr_remove_neigh(nr_neigh);
503
504 s->count--;
505
506 switch (i) {
507 case 0:
508 s->routes[0] = s->routes[1];
509 case 1:
510 s->routes[1] = s->routes[2];
511 case 2:
512 break;
513 }
514 break;
515
516 default:
517 s->routes[i].obs_count--;
518 break;
519
520 }
521 }
522
523 if (s->count <= 0)
524 nr_remove_node_locked(s);
525 nr_node_unlock(s);
526 }
527 spin_unlock_bh(&nr_node_list_lock);
528
529 return 0;
530 }
531
532 /*
533 * A device has been removed. Remove its routes and neighbours.
534 */
535 void nr_rt_device_down(struct net_device *dev)
536 {
537 struct nr_neigh *s;
538 struct hlist_node *node, *nodet, *node2, *node2t;
539 struct nr_node *t;
540 int i;
541
542 spin_lock_bh(&nr_neigh_list_lock);
543 nr_neigh_for_each_safe(s, node, nodet, &nr_neigh_list) {
544 if (s->dev == dev) {
545 spin_lock_bh(&nr_node_list_lock);
546 nr_node_for_each_safe(t, node2, node2t, &nr_node_list) {
547 nr_node_lock(t);
548 for (i = 0; i < t->count; i++) {
549 if (t->routes[i].neighbour == s) {
550 t->count--;
551
552 switch (i) {
553 case 0:
554 t->routes[0] = t->routes[1];
555 case 1:
556 t->routes[1] = t->routes[2];
557 case 2:
558 break;
559 }
560 }
561 }
562
563 if (t->count <= 0)
564 nr_remove_node_locked(t);
565 nr_node_unlock(t);
566 }
567 spin_unlock_bh(&nr_node_list_lock);
568
569 nr_remove_neigh_locked(s);
570 }
571 }
572 spin_unlock_bh(&nr_neigh_list_lock);
573 }
574
575 /*
576 * Check that the device given is a valid AX.25 interface that is "up".
577 * Or a valid ethernet interface with an AX.25 callsign binding.
578 */
579 static struct net_device *nr_ax25_dev_get(char *devname)
580 {
581 struct net_device *dev;
582
583 if ((dev = dev_get_by_name(&init_net, devname)) == NULL)
584 return NULL;
585
586 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
587 return dev;
588
589 dev_put(dev);
590 return NULL;
591 }
592
593 /*
594 * Find the first active NET/ROM device, usually "nr0".
595 */
596 struct net_device *nr_dev_first(void)
597 {
598 struct net_device *dev, *first = NULL;
599
600 read_lock(&dev_base_lock);
601 for_each_netdev(&init_net, dev) {
602 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM)
603 if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
604 first = dev;
605 }
606 if (first)
607 dev_hold(first);
608 read_unlock(&dev_base_lock);
609
610 return first;
611 }
612
613 /*
614 * Find the NET/ROM device for the given callsign.
615 */
616 struct net_device *nr_dev_get(ax25_address *addr)
617 {
618 struct net_device *dev;
619
620 read_lock(&dev_base_lock);
621 for_each_netdev(&init_net, dev) {
622 if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM && ax25cmp(addr, (ax25_address *)dev->dev_addr) == 0) {
623 dev_hold(dev);
624 goto out;
625 }
626 }
627 dev = NULL;
628 out:
629 read_unlock(&dev_base_lock);
630 return dev;
631 }
632
633 static ax25_digi *nr_call_to_digi(ax25_digi *digi, int ndigis,
634 ax25_address *digipeaters)
635 {
636 int i;
637
638 if (ndigis == 0)
639 return NULL;
640
641 for (i = 0; i < ndigis; i++) {
642 digi->calls[i] = digipeaters[i];
643 digi->repeated[i] = 0;
644 }
645
646 digi->ndigi = ndigis;
647 digi->lastrepeat = -1;
648
649 return digi;
650 }
651
652 /*
653 * Handle the ioctls that control the routing functions.
654 */
655 int nr_rt_ioctl(unsigned int cmd, void __user *arg)
656 {
657 struct nr_route_struct nr_route;
658 struct net_device *dev;
659 ax25_digi digi;
660 int ret;
661
662 switch (cmd) {
663 case SIOCADDRT:
664 if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct)))
665 return -EFAULT;
666 if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL)
667 return -EINVAL;
668 if (nr_route.ndigis < 0 || nr_route.ndigis > AX25_MAX_DIGIS) {
669 dev_put(dev);
670 return -EINVAL;
671 }
672 switch (nr_route.type) {
673 case NETROM_NODE:
674 ret = nr_add_node(&nr_route.callsign,
675 nr_route.mnemonic,
676 &nr_route.neighbour,
677 nr_call_to_digi(&digi, nr_route.ndigis,
678 nr_route.digipeaters),
679 dev, nr_route.quality,
680 nr_route.obs_count);
681 break;
682 case NETROM_NEIGH:
683 ret = nr_add_neigh(&nr_route.callsign,
684 nr_call_to_digi(&digi, nr_route.ndigis,
685 nr_route.digipeaters),
686 dev, nr_route.quality);
687 break;
688 default:
689 ret = -EINVAL;
690 }
691 dev_put(dev);
692 return ret;
693
694 case SIOCDELRT:
695 if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct)))
696 return -EFAULT;
697 if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL)
698 return -EINVAL;
699 switch (nr_route.type) {
700 case NETROM_NODE:
701 ret = nr_del_node(&nr_route.callsign,
702 &nr_route.neighbour, dev);
703 break;
704 case NETROM_NEIGH:
705 ret = nr_del_neigh(&nr_route.callsign,
706 dev, nr_route.quality);
707 break;
708 default:
709 ret = -EINVAL;
710 }
711 dev_put(dev);
712 return ret;
713
714 case SIOCNRDECOBS:
715 return nr_dec_obs();
716
717 default:
718 return -EINVAL;
719 }
720
721 return 0;
722 }
723
724 /*
725 * A level 2 link has timed out, therefore it appears to be a poor link,
726 * then don't use that neighbour until it is reset.
727 */
728 void nr_link_failed(ax25_cb *ax25, int reason)
729 {
730 struct nr_neigh *s, *nr_neigh = NULL;
731 struct hlist_node *node;
732 struct nr_node *nr_node = NULL;
733
734 spin_lock_bh(&nr_neigh_list_lock);
735 nr_neigh_for_each(s, node, &nr_neigh_list) {
736 if (s->ax25 == ax25) {
737 nr_neigh_hold(s);
738 nr_neigh = s;
739 break;
740 }
741 }
742 spin_unlock_bh(&nr_neigh_list_lock);
743
744 if (nr_neigh == NULL)
745 return;
746
747 nr_neigh->ax25 = NULL;
748 ax25_cb_put(ax25);
749
750 if (++nr_neigh->failed < sysctl_netrom_link_fails_count) {
751 nr_neigh_put(nr_neigh);
752 return;
753 }
754 spin_lock_bh(&nr_node_list_lock);
755 nr_node_for_each(nr_node, node, &nr_node_list) {
756 nr_node_lock(nr_node);
757 if (nr_node->which < nr_node->count &&
758 nr_node->routes[nr_node->which].neighbour == nr_neigh)
759 nr_node->which++;
760 nr_node_unlock(nr_node);
761 }
762 spin_unlock_bh(&nr_node_list_lock);
763 nr_neigh_put(nr_neigh);
764 }
765
766 /*
767 * Route a frame to an appropriate AX.25 connection. A NULL ax25_cb
768 * indicates an internally generated frame.
769 */
770 int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25)
771 {
772 ax25_address *nr_src, *nr_dest;
773 struct nr_neigh *nr_neigh;
774 struct nr_node *nr_node;
775 struct net_device *dev;
776 unsigned char *dptr;
777 ax25_cb *ax25s;
778 int ret;
779 struct sk_buff *skbn;
780
781
782 nr_src = (ax25_address *)(skb->data + 0);
783 nr_dest = (ax25_address *)(skb->data + 7);
784
785 if (ax25 != NULL) {
786 ret = nr_add_node(nr_src, "", &ax25->dest_addr, ax25->digipeat,
787 ax25->ax25_dev->dev, 0,
788 sysctl_netrom_obsolescence_count_initialiser);
789 if (ret)
790 return ret;
791 }
792
793 if ((dev = nr_dev_get(nr_dest)) != NULL) { /* Its for me */
794 if (ax25 == NULL) /* Its from me */
795 ret = nr_loopback_queue(skb);
796 else
797 ret = nr_rx_frame(skb, dev);
798 dev_put(dev);
799 return ret;
800 }
801
802 if (!sysctl_netrom_routing_control && ax25 != NULL)
803 return 0;
804
805 /* Its Time-To-Live has expired */
806 if (skb->data[14] == 1) {
807 return 0;
808 }
809
810 nr_node = nr_node_get(nr_dest);
811 if (nr_node == NULL)
812 return 0;
813 nr_node_lock(nr_node);
814
815 if (nr_node->which >= nr_node->count) {
816 nr_node_unlock(nr_node);
817 nr_node_put(nr_node);
818 return 0;
819 }
820
821 nr_neigh = nr_node->routes[nr_node->which].neighbour;
822
823 if ((dev = nr_dev_first()) == NULL) {
824 nr_node_unlock(nr_node);
825 nr_node_put(nr_node);
826 return 0;
827 }
828
829 /* We are going to change the netrom headers so we should get our
830 own skb, we also did not know until now how much header space
831 we had to reserve... - RXQ */
832 if ((skbn=skb_copy_expand(skb, dev->hard_header_len, 0, GFP_ATOMIC)) == NULL) {
833 nr_node_unlock(nr_node);
834 nr_node_put(nr_node);
835 dev_put(dev);
836 return 0;
837 }
838 kfree_skb(skb);
839 skb=skbn;
840 skb->data[14]--;
841
842 dptr = skb_push(skb, 1);
843 *dptr = AX25_P_NETROM;
844
845 ax25s = ax25_send_frame(skb, 256, (ax25_address *)dev->dev_addr, &nr_neigh->callsign, nr_neigh->digipeat, nr_neigh->dev);
846 if (nr_neigh->ax25 && ax25s) {
847 /* We were already holding this ax25_cb */
848 ax25_cb_put(ax25s);
849 }
850 nr_neigh->ax25 = ax25s;
851
852 dev_put(dev);
853 ret = (nr_neigh->ax25 != NULL);
854 nr_node_unlock(nr_node);
855 nr_node_put(nr_node);
856
857 return ret;
858 }
859
860 #ifdef CONFIG_PROC_FS
861
862 static void *nr_node_start(struct seq_file *seq, loff_t *pos)
863 {
864 struct nr_node *nr_node;
865 struct hlist_node *node;
866 int i = 1;
867
868 spin_lock_bh(&nr_node_list_lock);
869 if (*pos == 0)
870 return SEQ_START_TOKEN;
871
872 nr_node_for_each(nr_node, node, &nr_node_list) {
873 if (i == *pos)
874 return nr_node;
875 ++i;
876 }
877
878 return NULL;
879 }
880
881 static void *nr_node_next(struct seq_file *seq, void *v, loff_t *pos)
882 {
883 struct hlist_node *node;
884 ++*pos;
885
886 node = (v == SEQ_START_TOKEN)
887 ? nr_node_list.first
888 : ((struct nr_node *)v)->node_node.next;
889
890 return hlist_entry(node, struct nr_node, node_node);
891 }
892
893 static void nr_node_stop(struct seq_file *seq, void *v)
894 {
895 spin_unlock_bh(&nr_node_list_lock);
896 }
897
898 static int nr_node_show(struct seq_file *seq, void *v)
899 {
900 char buf[11];
901 int i;
902
903 if (v == SEQ_START_TOKEN)
904 seq_puts(seq,
905 "callsign mnemonic w n qual obs neigh qual obs neigh qual obs neigh\n");
906 else {
907 struct nr_node *nr_node = v;
908 nr_node_lock(nr_node);
909 seq_printf(seq, "%-9s %-7s %d %d",
910 ax2asc(buf, &nr_node->callsign),
911 (nr_node->mnemonic[0] == '\0') ? "*" : nr_node->mnemonic,
912 nr_node->which + 1,
913 nr_node->count);
914
915 for (i = 0; i < nr_node->count; i++) {
916 seq_printf(seq, " %3d %d %05d",
917 nr_node->routes[i].quality,
918 nr_node->routes[i].obs_count,
919 nr_node->routes[i].neighbour->number);
920 }
921 nr_node_unlock(nr_node);
922
923 seq_puts(seq, "\n");
924 }
925 return 0;
926 }
927
928 static const struct seq_operations nr_node_seqops = {
929 .start = nr_node_start,
930 .next = nr_node_next,
931 .stop = nr_node_stop,
932 .show = nr_node_show,
933 };
934
935 static int nr_node_info_open(struct inode *inode, struct file *file)
936 {
937 return seq_open(file, &nr_node_seqops);
938 }
939
940 const struct file_operations nr_nodes_fops = {
941 .owner = THIS_MODULE,
942 .open = nr_node_info_open,
943 .read = seq_read,
944 .llseek = seq_lseek,
945 .release = seq_release,
946 };
947
948 static void *nr_neigh_start(struct seq_file *seq, loff_t *pos)
949 {
950 struct nr_neigh *nr_neigh;
951 struct hlist_node *node;
952 int i = 1;
953
954 spin_lock_bh(&nr_neigh_list_lock);
955 if (*pos == 0)
956 return SEQ_START_TOKEN;
957
958 nr_neigh_for_each(nr_neigh, node, &nr_neigh_list) {
959 if (i == *pos)
960 return nr_neigh;
961 }
962 return NULL;
963 }
964
965 static void *nr_neigh_next(struct seq_file *seq, void *v, loff_t *pos)
966 {
967 struct hlist_node *node;
968 ++*pos;
969
970 node = (v == SEQ_START_TOKEN)
971 ? nr_neigh_list.first
972 : ((struct nr_neigh *)v)->neigh_node.next;
973
974 return hlist_entry(node, struct nr_neigh, neigh_node);
975 }
976
977 static void nr_neigh_stop(struct seq_file *seq, void *v)
978 {
979 spin_unlock_bh(&nr_neigh_list_lock);
980 }
981
982 static int nr_neigh_show(struct seq_file *seq, void *v)
983 {
984 char buf[11];
985 int i;
986
987 if (v == SEQ_START_TOKEN)
988 seq_puts(seq, "addr callsign dev qual lock count failed digipeaters\n");
989 else {
990 struct nr_neigh *nr_neigh = v;
991
992 seq_printf(seq, "%05d %-9s %-4s %3d %d %3d %3d",
993 nr_neigh->number,
994 ax2asc(buf, &nr_neigh->callsign),
995 nr_neigh->dev ? nr_neigh->dev->name : "???",
996 nr_neigh->quality,
997 nr_neigh->locked,
998 nr_neigh->count,
999 nr_neigh->failed);
1000
1001 if (nr_neigh->digipeat != NULL) {
1002 for (i = 0; i < nr_neigh->digipeat->ndigi; i++)
1003 seq_printf(seq, " %s",
1004 ax2asc(buf, &nr_neigh->digipeat->calls[i]));
1005 }
1006
1007 seq_puts(seq, "\n");
1008 }
1009 return 0;
1010 }
1011
1012 static const struct seq_operations nr_neigh_seqops = {
1013 .start = nr_neigh_start,
1014 .next = nr_neigh_next,
1015 .stop = nr_neigh_stop,
1016 .show = nr_neigh_show,
1017 };
1018
1019 static int nr_neigh_info_open(struct inode *inode, struct file *file)
1020 {
1021 return seq_open(file, &nr_neigh_seqops);
1022 }
1023
1024 const struct file_operations nr_neigh_fops = {
1025 .owner = THIS_MODULE,
1026 .open = nr_neigh_info_open,
1027 .read = seq_read,
1028 .llseek = seq_lseek,
1029 .release = seq_release,
1030 };
1031
1032 #endif
1033
1034 /*
1035 * Free all memory associated with the nodes and routes lists.
1036 */
1037 void __exit nr_rt_free(void)
1038 {
1039 struct nr_neigh *s = NULL;
1040 struct nr_node *t = NULL;
1041 struct hlist_node *node, *nodet;
1042
1043 spin_lock_bh(&nr_neigh_list_lock);
1044 spin_lock_bh(&nr_node_list_lock);
1045 nr_node_for_each_safe(t, node, nodet, &nr_node_list) {
1046 nr_node_lock(t);
1047 nr_remove_node_locked(t);
1048 nr_node_unlock(t);
1049 }
1050 nr_neigh_for_each_safe(s, node, nodet, &nr_neigh_list) {
1051 while(s->count) {
1052 s->count--;
1053 nr_neigh_put(s);
1054 }
1055 nr_remove_neigh_locked(s);
1056 }
1057 spin_unlock_bh(&nr_node_list_lock);
1058 spin_unlock_bh(&nr_neigh_list_lock);
1059 }
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