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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 */
Randy Dunlap4fc268d2006-01-11 12:17:47 -080014
15#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/errno.h>
17#include <linux/types.h>
18#include <linux/socket.h>
19#include <linux/timer.h>
20#include <linux/in.h>
21#include <linux/kernel.h>
22#include <linux/sched.h>
23#include <linux/string.h>
24#include <linux/sockios.h>
25#include <linux/net.h>
26#include <net/ax25.h>
27#include <linux/inet.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/skbuff.h>
31#include <linux/spinlock.h>
32#include <net/sock.h>
33#include <asm/uaccess.h>
34#include <asm/system.h>
35#include <linux/fcntl.h>
36#include <linux/mm.h>
37#include <linux/interrupt.h>
38#include <linux/init.h>
39#include <linux/seq_file.h>
40
41static ax25_route *ax25_route_list;
42static DEFINE_RWLOCK(ax25_route_lock);
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044void 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;
Jesper Juhla51482b2005-11-08 09:41:34 -080057 kfree(s->digipeat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 kfree(s);
59 } else {
60 for (t = ax25_route_list; t != NULL; t = t->next) {
61 if (t->next == s) {
62 t->next = s->next;
Jesper Juhla51482b2005-11-08 09:41:34 -080063 kfree(s->digipeat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 kfree(s);
65 break;
66 }
67 }
68 }
69 }
70 }
71 write_unlock(&ax25_route_lock);
72}
73
Ralf Baechlec9266b92006-12-14 15:49:28 -080074static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
76 ax25_route *ax25_rt;
77 ax25_dev *ax25_dev;
78 int i;
79
80 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
81 return -EINVAL;
82 if (route->digi_count > AX25_MAX_DIGIS)
83 return -EINVAL;
84
85 write_lock(&ax25_route_lock);
86
87 ax25_rt = ax25_route_list;
88 while (ax25_rt != NULL) {
89 if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
YOSHIFUJI Hideaki528930b2007-02-09 23:24:31 +090090 ax25_rt->dev == ax25_dev->dev) {
Jesper Juhla51482b2005-11-08 09:41:34 -080091 kfree(ax25_rt->digipeat);
92 ax25_rt->digipeat = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 if (route->digi_count != 0) {
94 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
95 write_unlock(&ax25_route_lock);
96 return -ENOMEM;
97 }
98 ax25_rt->digipeat->lastrepeat = -1;
99 ax25_rt->digipeat->ndigi = route->digi_count;
100 for (i = 0; i < route->digi_count; i++) {
101 ax25_rt->digipeat->repeated[i] = 0;
102 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
103 }
104 }
105 write_unlock(&ax25_route_lock);
106 return 0;
107 }
108 ax25_rt = ax25_rt->next;
109 }
110
111 if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
112 write_unlock(&ax25_route_lock);
113 return -ENOMEM;
114 }
115
Ralf Baechle DL5RB006f68b2006-07-03 19:30:18 -0700116 atomic_set(&ax25_rt->refcount, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 ax25_rt->callsign = route->dest_addr;
118 ax25_rt->dev = ax25_dev->dev;
119 ax25_rt->digipeat = NULL;
120 ax25_rt->ip_mode = ' ';
121 if (route->digi_count != 0) {
122 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
123 write_unlock(&ax25_route_lock);
124 kfree(ax25_rt);
125 return -ENOMEM;
126 }
127 ax25_rt->digipeat->lastrepeat = -1;
128 ax25_rt->digipeat->ndigi = route->digi_count;
129 for (i = 0; i < route->digi_count; i++) {
130 ax25_rt->digipeat->repeated[i] = 0;
131 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
132 }
133 }
134 ax25_rt->next = ax25_route_list;
135 ax25_route_list = ax25_rt;
136 write_unlock(&ax25_route_lock);
137
138 return 0;
139}
140
Ralf Baechle DL5RB006f68b2006-07-03 19:30:18 -0700141void __ax25_put_route(ax25_route *ax25_rt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
Ralf Baechle DL5RB006f68b2006-07-03 19:30:18 -0700143 kfree(ax25_rt->digipeat);
144 kfree(ax25_rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
147static int ax25_rt_del(struct ax25_routes_struct *route)
148{
149 ax25_route *s, *t, *ax25_rt;
150 ax25_dev *ax25_dev;
151
152 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
153 return -EINVAL;
154
155 write_lock(&ax25_route_lock);
156
157 ax25_rt = ax25_route_list;
158 while (ax25_rt != NULL) {
159 s = ax25_rt;
160 ax25_rt = ax25_rt->next;
161 if (s->dev == ax25_dev->dev &&
162 ax25cmp(&route->dest_addr, &s->callsign) == 0) {
163 if (ax25_route_list == s) {
164 ax25_route_list = s->next;
Ralf Baechle DL5RB006f68b2006-07-03 19:30:18 -0700165 ax25_put_route(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 } else {
167 for (t = ax25_route_list; t != NULL; t = t->next) {
168 if (t->next == s) {
169 t->next = s->next;
Ralf Baechle DL5RB006f68b2006-07-03 19:30:18 -0700170 ax25_put_route(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 break;
172 }
173 }
174 }
175 }
176 }
177 write_unlock(&ax25_route_lock);
178
179 return 0;
180}
181
182static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
183{
184 ax25_route *ax25_rt;
185 ax25_dev *ax25_dev;
186 int err = 0;
187
188 if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
189 return -EINVAL;
190
191 write_lock(&ax25_route_lock);
192
193 ax25_rt = ax25_route_list;
194 while (ax25_rt != NULL) {
195 if (ax25_rt->dev == ax25_dev->dev &&
196 ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
197 switch (rt_option->cmd) {
198 case AX25_SET_RT_IPMODE:
199 switch (rt_option->arg) {
200 case ' ':
201 case 'D':
202 case 'V':
203 ax25_rt->ip_mode = rt_option->arg;
204 break;
205 default:
206 err = -EINVAL;
207 goto out;
208 }
209 break;
210 default:
211 err = -EINVAL;
212 goto out;
213 }
214 }
215 ax25_rt = ax25_rt->next;
216 }
217
218out:
219 write_unlock(&ax25_route_lock);
220 return err;
221}
222
223int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
224{
225 struct ax25_route_opt_struct rt_option;
226 struct ax25_routes_struct route;
227
228 switch (cmd) {
229 case SIOCADDRT:
230 if (copy_from_user(&route, arg, sizeof(route)))
231 return -EFAULT;
232 return ax25_rt_add(&route);
233
234 case SIOCDELRT:
235 if (copy_from_user(&route, arg, sizeof(route)))
236 return -EFAULT;
237 return ax25_rt_del(&route);
238
239 case SIOCAX25OPTRT:
240 if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
241 return -EFAULT;
242 return ax25_rt_opt(&rt_option);
243
244 default:
245 return -EINVAL;
246 }
247}
248
249#ifdef CONFIG_PROC_FS
250
251static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
252{
253 struct ax25_route *ax25_rt;
254 int i = 1;
YOSHIFUJI Hideaki528930b2007-02-09 23:24:31 +0900255
256 read_lock(&ax25_route_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 if (*pos == 0)
258 return SEQ_START_TOKEN;
259
260 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
261 if (i == *pos)
262 return ax25_rt;
263 ++i;
264 }
265
266 return NULL;
267}
268
269static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
270{
271 ++*pos;
YOSHIFUJI Hideaki528930b2007-02-09 23:24:31 +0900272 return (v == SEQ_START_TOKEN) ? ax25_route_list :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 ((struct ax25_route *) v)->next;
274}
275
276static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
277{
278 read_unlock(&ax25_route_lock);
279}
280
281static int ax25_rt_seq_show(struct seq_file *seq, void *v)
282{
Ralf Baechlef75268c2005-09-06 15:49:39 -0700283 char buf[11];
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 if (v == SEQ_START_TOKEN)
286 seq_puts(seq, "callsign dev mode digipeaters\n");
287 else {
288 struct ax25_route *ax25_rt = v;
289 const char *callsign;
290 int i;
291
292 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
293 callsign = "default";
294 else
Ralf Baechlef75268c2005-09-06 15:49:39 -0700295 callsign = ax2asc(buf, &ax25_rt->callsign);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 seq_printf(seq, "%-9s %-4s",
298 callsign,
299 ax25_rt->dev ? ax25_rt->dev->name : "???");
300
301 switch (ax25_rt->ip_mode) {
302 case 'V':
303 seq_puts(seq, " vc");
304 break;
305 case 'D':
306 seq_puts(seq, " dg");
307 break;
308 default:
309 seq_puts(seq, " *");
310 break;
311 }
312
313 if (ax25_rt->digipeat != NULL)
314 for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
Ralf Baechlef75268c2005-09-06 15:49:39 -0700315 seq_printf(seq, " %s",
316 ax2asc(buf, &ax25_rt->digipeat->calls[i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
318 seq_puts(seq, "\n");
319 }
320 return 0;
321}
322
323static struct seq_operations ax25_rt_seqops = {
324 .start = ax25_rt_seq_start,
325 .next = ax25_rt_seq_next,
326 .stop = ax25_rt_seq_stop,
327 .show = ax25_rt_seq_show,
328};
329
330static int ax25_rt_info_open(struct inode *inode, struct file *file)
331{
332 return seq_open(file, &ax25_rt_seqops);
333}
334
Arjan van de Ven9a321442007-02-12 00:55:35 -0800335const struct file_operations ax25_route_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 .owner = THIS_MODULE,
337 .open = ax25_rt_info_open,
338 .read = seq_read,
339 .llseek = seq_lseek,
340 .release = seq_release,
341};
342
343#endif
344
345/*
346 * Find AX.25 route
347 *
Ralf Baechle3f072312006-05-03 23:22:36 -0700348 * Only routes with a reference count of zero can be destroyed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 */
Ralf Baechle DL5RB006f68b2006-07-03 19:30:18 -0700350ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
352 ax25_route *ax25_spe_rt = NULL;
353 ax25_route *ax25_def_rt = NULL;
354 ax25_route *ax25_rt;
355
356 read_lock(&ax25_route_lock);
357 /*
358 * Bind to the physical interface we heard them on, or the default
359 * route if none is found;
360 */
361 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
362 if (dev == NULL) {
363 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
364 ax25_spe_rt = ax25_rt;
365 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
366 ax25_def_rt = ax25_rt;
367 } else {
368 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
369 ax25_spe_rt = ax25_rt;
370 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
371 ax25_def_rt = ax25_rt;
372 }
373 }
374
375 ax25_rt = ax25_def_rt;
376 if (ax25_spe_rt != NULL)
377 ax25_rt = ax25_spe_rt;
378
379 if (ax25_rt != NULL)
Ralf Baechle DL5RB006f68b2006-07-03 19:30:18 -0700380 ax25_hold_route(ax25_rt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382 read_unlock(&ax25_route_lock);
383
384 return ax25_rt;
385}
386
387/*
388 * Adjust path: If you specify a default route and want to connect
389 * a target on the digipeater path but w/o having a special route
390 * set before, the path has to be truncated from your target on.
391 */
392static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
393{
394 int k;
395
396 for (k = 0; k < digipeat->ndigi; k++) {
397 if (ax25cmp(addr, &digipeat->calls[k]) == 0)
398 break;
399 }
400
401 digipeat->ndigi = k;
402}
403
404
405/*
406 * Find which interface to use.
407 */
408int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
409{
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700410 ax25_uid_assoc *user;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 ax25_route *ax25_rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 int err;
413
414 if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
415 return -EHOSTUNREACH;
416
417 if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
418 err = -EHOSTUNREACH;
419 goto put;
420 }
421
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700422 user = ax25_findbyuid(current->euid);
423 if (user) {
424 ax25->source_addr = user->call;
425 ax25_uid_put(user);
426 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
428 err = -EPERM;
429 goto put;
430 }
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700431 ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 }
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (ax25_rt->digipeat != NULL) {
Arnaldo Carvalho de Melo0459d70a2006-11-17 12:43:07 -0200435 ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
436 GFP_ATOMIC);
437 if (ax25->digipeat == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 err = -ENOMEM;
439 goto put;
440 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 ax25_adjust_path(addr, ax25->digipeat);
442 }
443
444 if (ax25->sk != NULL) {
445 bh_lock_sock(ax25->sk);
446 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
447 bh_unlock_sock(ax25->sk);
448 }
449
450put:
451 ax25_put_route(ax25_rt);
452
453 return 0;
454}
455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
457 ax25_address *dest, ax25_digi *digi)
458{
459 struct sk_buff *skbn;
460 unsigned char *bp;
461 int len;
462
463 len = digi->ndigi * AX25_ADDR_LEN;
464
465 if (skb_headroom(skb) < len) {
466 if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
467 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
468 return NULL;
469 }
470
471 if (skb->sk != NULL)
472 skb_set_owner_w(skbn, skb->sk);
473
474 kfree_skb(skb);
475
476 skb = skbn;
477 }
478
479 bp = skb_push(skb, len);
480
481 ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
482
483 return skb;
484}
485
486/*
487 * Free all memory associated with routing structures.
488 */
489void __exit ax25_rt_free(void)
490{
491 ax25_route *s, *ax25_rt = ax25_route_list;
492
493 write_lock(&ax25_route_lock);
494 while (ax25_rt != NULL) {
495 s = ax25_rt;
496 ax25_rt = ax25_rt->next;
497
Jesper Juhla51482b2005-11-08 09:41:34 -0800498 kfree(s->digipeat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 kfree(s);
500 }
501 write_unlock(&ax25_route_lock);
502}