blob: 26b77d9722201232d7adfcb2bb27dcc3fb90e246 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
8 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
10 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
11 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
12 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
13 */
14#include <linux/errno.h>
15#include <linux/types.h>
16#include <linux/socket.h>
17#include <linux/timer.h>
18#include <linux/in.h>
19#include <linux/kernel.h>
20#include <linux/sched.h>
21#include <linux/string.h>
22#include <linux/sockios.h>
23#include <linux/net.h>
24#include <net/ax25.h>
25#include <linux/inet.h>
26#include <linux/netdevice.h>
27#include <linux/if_arp.h>
28#include <linux/skbuff.h>
29#include <linux/spinlock.h>
30#include <net/sock.h>
31#include <asm/uaccess.h>
32#include <asm/system.h>
33#include <linux/fcntl.h>
34#include <linux/mm.h>
35#include <linux/interrupt.h>
36#include <linux/init.h>
37#include <linux/seq_file.h>
38
39static ax25_route *ax25_route_list;
40static DEFINE_RWLOCK(ax25_route_lock);
41
42static ax25_route *ax25_get_route(ax25_address *, struct net_device *);
43
44void ax25_rt_device_down(struct net_device *dev)
45{
46 ax25_route *s, *t, *ax25_rt;
47
48 write_lock(&ax25_route_lock);
49 ax25_rt = ax25_route_list;
50 while (ax25_rt != NULL) {
51 s = ax25_rt;
52 ax25_rt = ax25_rt->next;
53
54 if (s->dev == dev) {
55 if (ax25_route_list == s) {
56 ax25_route_list = s->next;
57 if (s->digipeat != NULL)
58 kfree(s->digipeat);
59 kfree(s);
60 } else {
61 for (t = ax25_route_list; t != NULL; t = t->next) {
62 if (t->next == s) {
63 t->next = s->next;
64 if (s->digipeat != NULL)
65 kfree(s->digipeat);
66 kfree(s);
67 break;
68 }
69 }
70 }
71 }
72 }
73 write_unlock(&ax25_route_lock);
74}
75
76static int ax25_rt_add(struct ax25_routes_struct *route)
77{
78 ax25_route *ax25_rt;
79 ax25_dev *ax25_dev;
80 int i;
81
82 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
83 return -EINVAL;
84 if (route->digi_count > AX25_MAX_DIGIS)
85 return -EINVAL;
86
87 write_lock(&ax25_route_lock);
88
89 ax25_rt = ax25_route_list;
90 while (ax25_rt != NULL) {
91 if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
92 ax25_rt->dev == ax25_dev->dev) {
93 if (ax25_rt->digipeat != NULL) {
94 kfree(ax25_rt->digipeat);
95 ax25_rt->digipeat = NULL;
96 }
97 if (route->digi_count != 0) {
98 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
99 write_unlock(&ax25_route_lock);
100 return -ENOMEM;
101 }
102 ax25_rt->digipeat->lastrepeat = -1;
103 ax25_rt->digipeat->ndigi = route->digi_count;
104 for (i = 0; i < route->digi_count; i++) {
105 ax25_rt->digipeat->repeated[i] = 0;
106 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
107 }
108 }
109 write_unlock(&ax25_route_lock);
110 return 0;
111 }
112 ax25_rt = ax25_rt->next;
113 }
114
115 if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
116 write_unlock(&ax25_route_lock);
117 return -ENOMEM;
118 }
119
120 atomic_set(&ax25_rt->ref, 0);
121 ax25_rt->callsign = route->dest_addr;
122 ax25_rt->dev = ax25_dev->dev;
123 ax25_rt->digipeat = NULL;
124 ax25_rt->ip_mode = ' ';
125 if (route->digi_count != 0) {
126 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
127 write_unlock(&ax25_route_lock);
128 kfree(ax25_rt);
129 return -ENOMEM;
130 }
131 ax25_rt->digipeat->lastrepeat = -1;
132 ax25_rt->digipeat->ndigi = route->digi_count;
133 for (i = 0; i < route->digi_count; i++) {
134 ax25_rt->digipeat->repeated[i] = 0;
135 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
136 }
137 }
138 ax25_rt->next = ax25_route_list;
139 ax25_route_list = ax25_rt;
140 write_unlock(&ax25_route_lock);
141
142 return 0;
143}
144
145static void ax25_rt_destroy(ax25_route *ax25_rt)
146{
147 if (atomic_read(&ax25_rt->ref) == 0) {
148 if (ax25_rt->digipeat != NULL)
149 kfree(ax25_rt->digipeat);
150 kfree(ax25_rt);
151 return;
152 }
153
154 /*
155 * Uh... Route is still in use; we can't yet destroy it. Retry later.
156 */
157 init_timer(&ax25_rt->timer);
158 ax25_rt->timer.data = (unsigned long) ax25_rt;
159 ax25_rt->timer.function = (void *) ax25_rt_destroy;
160 ax25_rt->timer.expires = jiffies + 5 * HZ;
161
162 add_timer(&ax25_rt->timer);
163}
164
165static int ax25_rt_del(struct ax25_routes_struct *route)
166{
167 ax25_route *s, *t, *ax25_rt;
168 ax25_dev *ax25_dev;
169
170 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
171 return -EINVAL;
172
173 write_lock(&ax25_route_lock);
174
175 ax25_rt = ax25_route_list;
176 while (ax25_rt != NULL) {
177 s = ax25_rt;
178 ax25_rt = ax25_rt->next;
179 if (s->dev == ax25_dev->dev &&
180 ax25cmp(&route->dest_addr, &s->callsign) == 0) {
181 if (ax25_route_list == s) {
182 ax25_route_list = s->next;
183 ax25_rt_destroy(s);
184 } else {
185 for (t = ax25_route_list; t != NULL; t = t->next) {
186 if (t->next == s) {
187 t->next = s->next;
188 ax25_rt_destroy(s);
189 break;
190 }
191 }
192 }
193 }
194 }
195 write_unlock(&ax25_route_lock);
196
197 return 0;
198}
199
200static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
201{
202 ax25_route *ax25_rt;
203 ax25_dev *ax25_dev;
204 int err = 0;
205
206 if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
207 return -EINVAL;
208
209 write_lock(&ax25_route_lock);
210
211 ax25_rt = ax25_route_list;
212 while (ax25_rt != NULL) {
213 if (ax25_rt->dev == ax25_dev->dev &&
214 ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
215 switch (rt_option->cmd) {
216 case AX25_SET_RT_IPMODE:
217 switch (rt_option->arg) {
218 case ' ':
219 case 'D':
220 case 'V':
221 ax25_rt->ip_mode = rt_option->arg;
222 break;
223 default:
224 err = -EINVAL;
225 goto out;
226 }
227 break;
228 default:
229 err = -EINVAL;
230 goto out;
231 }
232 }
233 ax25_rt = ax25_rt->next;
234 }
235
236out:
237 write_unlock(&ax25_route_lock);
238 return err;
239}
240
241int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
242{
243 struct ax25_route_opt_struct rt_option;
244 struct ax25_routes_struct route;
245
246 switch (cmd) {
247 case SIOCADDRT:
248 if (copy_from_user(&route, arg, sizeof(route)))
249 return -EFAULT;
250 return ax25_rt_add(&route);
251
252 case SIOCDELRT:
253 if (copy_from_user(&route, arg, sizeof(route)))
254 return -EFAULT;
255 return ax25_rt_del(&route);
256
257 case SIOCAX25OPTRT:
258 if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
259 return -EFAULT;
260 return ax25_rt_opt(&rt_option);
261
262 default:
263 return -EINVAL;
264 }
265}
266
267#ifdef CONFIG_PROC_FS
268
269static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
270{
271 struct ax25_route *ax25_rt;
272 int i = 1;
273
274 read_lock(&ax25_route_lock);
275 if (*pos == 0)
276 return SEQ_START_TOKEN;
277
278 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
279 if (i == *pos)
280 return ax25_rt;
281 ++i;
282 }
283
284 return NULL;
285}
286
287static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
288{
289 ++*pos;
290 return (v == SEQ_START_TOKEN) ? ax25_route_list :
291 ((struct ax25_route *) v)->next;
292}
293
294static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
295{
296 read_unlock(&ax25_route_lock);
297}
298
299static int ax25_rt_seq_show(struct seq_file *seq, void *v)
300{
Ralf Baechlef75268c2005-09-06 15:49:39 -0700301 char buf[11];
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 if (v == SEQ_START_TOKEN)
304 seq_puts(seq, "callsign dev mode digipeaters\n");
305 else {
306 struct ax25_route *ax25_rt = v;
307 const char *callsign;
308 int i;
309
310 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
311 callsign = "default";
312 else
Ralf Baechlef75268c2005-09-06 15:49:39 -0700313 callsign = ax2asc(buf, &ax25_rt->callsign);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 seq_printf(seq, "%-9s %-4s",
316 callsign,
317 ax25_rt->dev ? ax25_rt->dev->name : "???");
318
319 switch (ax25_rt->ip_mode) {
320 case 'V':
321 seq_puts(seq, " vc");
322 break;
323 case 'D':
324 seq_puts(seq, " dg");
325 break;
326 default:
327 seq_puts(seq, " *");
328 break;
329 }
330
331 if (ax25_rt->digipeat != NULL)
332 for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
Ralf Baechlef75268c2005-09-06 15:49:39 -0700333 seq_printf(seq, " %s",
334 ax2asc(buf, &ax25_rt->digipeat->calls[i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 seq_puts(seq, "\n");
337 }
338 return 0;
339}
340
341static struct seq_operations ax25_rt_seqops = {
342 .start = ax25_rt_seq_start,
343 .next = ax25_rt_seq_next,
344 .stop = ax25_rt_seq_stop,
345 .show = ax25_rt_seq_show,
346};
347
348static int ax25_rt_info_open(struct inode *inode, struct file *file)
349{
350 return seq_open(file, &ax25_rt_seqops);
351}
352
353struct file_operations ax25_route_fops = {
354 .owner = THIS_MODULE,
355 .open = ax25_rt_info_open,
356 .read = seq_read,
357 .llseek = seq_lseek,
358 .release = seq_release,
359};
360
361#endif
362
363/*
364 * Find AX.25 route
365 *
366 * Only routes with a refernce rout of zero can be destroyed.
367 */
368static ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
369{
370 ax25_route *ax25_spe_rt = NULL;
371 ax25_route *ax25_def_rt = NULL;
372 ax25_route *ax25_rt;
373
374 read_lock(&ax25_route_lock);
375 /*
376 * Bind to the physical interface we heard them on, or the default
377 * route if none is found;
378 */
379 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
380 if (dev == NULL) {
381 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
382 ax25_spe_rt = ax25_rt;
383 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
384 ax25_def_rt = ax25_rt;
385 } else {
386 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
387 ax25_spe_rt = ax25_rt;
388 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
389 ax25_def_rt = ax25_rt;
390 }
391 }
392
393 ax25_rt = ax25_def_rt;
394 if (ax25_spe_rt != NULL)
395 ax25_rt = ax25_spe_rt;
396
397 if (ax25_rt != NULL)
398 atomic_inc(&ax25_rt->ref);
399
400 read_unlock(&ax25_route_lock);
401
402 return ax25_rt;
403}
404
405/*
406 * Adjust path: If you specify a default route and want to connect
407 * a target on the digipeater path but w/o having a special route
408 * set before, the path has to be truncated from your target on.
409 */
410static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
411{
412 int k;
413
414 for (k = 0; k < digipeat->ndigi; k++) {
415 if (ax25cmp(addr, &digipeat->calls[k]) == 0)
416 break;
417 }
418
419 digipeat->ndigi = k;
420}
421
422
423/*
424 * Find which interface to use.
425 */
426int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
427{
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700428 ax25_uid_assoc *user;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 ax25_route *ax25_rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 int err;
431
432 if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
433 return -EHOSTUNREACH;
434
435 if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
436 err = -EHOSTUNREACH;
437 goto put;
438 }
439
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700440 user = ax25_findbyuid(current->euid);
441 if (user) {
442 ax25->source_addr = user->call;
443 ax25_uid_put(user);
444 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
446 err = -EPERM;
447 goto put;
448 }
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700449 ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 }
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 if (ax25_rt->digipeat != NULL) {
453 if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
454 err = -ENOMEM;
455 goto put;
456 }
457 memcpy(ax25->digipeat, ax25_rt->digipeat, sizeof(ax25_digi));
458 ax25_adjust_path(addr, ax25->digipeat);
459 }
460
461 if (ax25->sk != NULL) {
462 bh_lock_sock(ax25->sk);
463 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
464 bh_unlock_sock(ax25->sk);
465 }
466
467put:
468 ax25_put_route(ax25_rt);
469
470 return 0;
471}
472
473ax25_route *ax25_rt_find_route(ax25_route * route, ax25_address *addr,
474 struct net_device *dev)
475{
476 ax25_route *ax25_rt;
477
478 if ((ax25_rt = ax25_get_route(addr, dev)))
479 return ax25_rt;
480
481 route->next = NULL;
482 atomic_set(&route->ref, 1);
483 route->callsign = *addr;
484 route->dev = dev;
485 route->digipeat = NULL;
486 route->ip_mode = ' ';
487
488 return route;
489}
490
491struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
492 ax25_address *dest, ax25_digi *digi)
493{
494 struct sk_buff *skbn;
495 unsigned char *bp;
496 int len;
497
498 len = digi->ndigi * AX25_ADDR_LEN;
499
500 if (skb_headroom(skb) < len) {
501 if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
502 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
503 return NULL;
504 }
505
506 if (skb->sk != NULL)
507 skb_set_owner_w(skbn, skb->sk);
508
509 kfree_skb(skb);
510
511 skb = skbn;
512 }
513
514 bp = skb_push(skb, len);
515
516 ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
517
518 return skb;
519}
520
521/*
522 * Free all memory associated with routing structures.
523 */
524void __exit ax25_rt_free(void)
525{
526 ax25_route *s, *ax25_rt = ax25_route_list;
527
528 write_lock(&ax25_route_lock);
529 while (ax25_rt != NULL) {
530 s = ax25_rt;
531 ax25_rt = ax25_rt->next;
532
533 if (s->digipeat != NULL)
534 kfree(s->digipeat);
535
536 kfree(s);
537 }
538 write_unlock(&ax25_route_lock);
539}