blob: f04f8630fd2835e61cef28562cb7e4bd12203767 [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 */
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
44static ax25_route *ax25_get_route(ax25_address *, struct net_device *);
45
46void ax25_rt_device_down(struct net_device *dev)
47{
48 ax25_route *s, *t, *ax25_rt;
49
50 write_lock(&ax25_route_lock);
51 ax25_rt = ax25_route_list;
52 while (ax25_rt != NULL) {
53 s = ax25_rt;
54 ax25_rt = ax25_rt->next;
55
56 if (s->dev == dev) {
57 if (ax25_route_list == s) {
58 ax25_route_list = s->next;
Jesper Juhla51482b2005-11-08 09:41:34 -080059 kfree(s->digipeat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 kfree(s);
61 } else {
62 for (t = ax25_route_list; t != NULL; t = t->next) {
63 if (t->next == s) {
64 t->next = s->next;
Jesper Juhla51482b2005-11-08 09:41:34 -080065 kfree(s->digipeat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 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) {
Jesper Juhla51482b2005-11-08 09:41:34 -080093 kfree(ax25_rt->digipeat);
94 ax25_rt->digipeat = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 if (route->digi_count != 0) {
96 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
97 write_unlock(&ax25_route_lock);
98 return -ENOMEM;
99 }
100 ax25_rt->digipeat->lastrepeat = -1;
101 ax25_rt->digipeat->ndigi = route->digi_count;
102 for (i = 0; i < route->digi_count; i++) {
103 ax25_rt->digipeat->repeated[i] = 0;
104 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
105 }
106 }
107 write_unlock(&ax25_route_lock);
108 return 0;
109 }
110 ax25_rt = ax25_rt->next;
111 }
112
113 if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
114 write_unlock(&ax25_route_lock);
115 return -ENOMEM;
116 }
117
118 atomic_set(&ax25_rt->ref, 0);
119 ax25_rt->callsign = route->dest_addr;
120 ax25_rt->dev = ax25_dev->dev;
121 ax25_rt->digipeat = NULL;
122 ax25_rt->ip_mode = ' ';
123 if (route->digi_count != 0) {
124 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
125 write_unlock(&ax25_route_lock);
126 kfree(ax25_rt);
127 return -ENOMEM;
128 }
129 ax25_rt->digipeat->lastrepeat = -1;
130 ax25_rt->digipeat->ndigi = route->digi_count;
131 for (i = 0; i < route->digi_count; i++) {
132 ax25_rt->digipeat->repeated[i] = 0;
133 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
134 }
135 }
136 ax25_rt->next = ax25_route_list;
137 ax25_route_list = ax25_rt;
138 write_unlock(&ax25_route_lock);
139
140 return 0;
141}
142
143static void ax25_rt_destroy(ax25_route *ax25_rt)
144{
145 if (atomic_read(&ax25_rt->ref) == 0) {
Jesper Juhla51482b2005-11-08 09:41:34 -0800146 kfree(ax25_rt->digipeat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 kfree(ax25_rt);
148 return;
149 }
150
151 /*
152 * Uh... Route is still in use; we can't yet destroy it. Retry later.
153 */
154 init_timer(&ax25_rt->timer);
155 ax25_rt->timer.data = (unsigned long) ax25_rt;
156 ax25_rt->timer.function = (void *) ax25_rt_destroy;
157 ax25_rt->timer.expires = jiffies + 5 * HZ;
158
159 add_timer(&ax25_rt->timer);
160}
161
162static int ax25_rt_del(struct ax25_routes_struct *route)
163{
164 ax25_route *s, *t, *ax25_rt;
165 ax25_dev *ax25_dev;
166
167 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
168 return -EINVAL;
169
170 write_lock(&ax25_route_lock);
171
172 ax25_rt = ax25_route_list;
173 while (ax25_rt != NULL) {
174 s = ax25_rt;
175 ax25_rt = ax25_rt->next;
176 if (s->dev == ax25_dev->dev &&
177 ax25cmp(&route->dest_addr, &s->callsign) == 0) {
178 if (ax25_route_list == s) {
179 ax25_route_list = s->next;
180 ax25_rt_destroy(s);
181 } else {
182 for (t = ax25_route_list; t != NULL; t = t->next) {
183 if (t->next == s) {
184 t->next = s->next;
185 ax25_rt_destroy(s);
186 break;
187 }
188 }
189 }
190 }
191 }
192 write_unlock(&ax25_route_lock);
193
194 return 0;
195}
196
197static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
198{
199 ax25_route *ax25_rt;
200 ax25_dev *ax25_dev;
201 int err = 0;
202
203 if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
204 return -EINVAL;
205
206 write_lock(&ax25_route_lock);
207
208 ax25_rt = ax25_route_list;
209 while (ax25_rt != NULL) {
210 if (ax25_rt->dev == ax25_dev->dev &&
211 ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
212 switch (rt_option->cmd) {
213 case AX25_SET_RT_IPMODE:
214 switch (rt_option->arg) {
215 case ' ':
216 case 'D':
217 case 'V':
218 ax25_rt->ip_mode = rt_option->arg;
219 break;
220 default:
221 err = -EINVAL;
222 goto out;
223 }
224 break;
225 default:
226 err = -EINVAL;
227 goto out;
228 }
229 }
230 ax25_rt = ax25_rt->next;
231 }
232
233out:
234 write_unlock(&ax25_route_lock);
235 return err;
236}
237
238int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
239{
240 struct ax25_route_opt_struct rt_option;
241 struct ax25_routes_struct route;
242
243 switch (cmd) {
244 case SIOCADDRT:
245 if (copy_from_user(&route, arg, sizeof(route)))
246 return -EFAULT;
247 return ax25_rt_add(&route);
248
249 case SIOCDELRT:
250 if (copy_from_user(&route, arg, sizeof(route)))
251 return -EFAULT;
252 return ax25_rt_del(&route);
253
254 case SIOCAX25OPTRT:
255 if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
256 return -EFAULT;
257 return ax25_rt_opt(&rt_option);
258
259 default:
260 return -EINVAL;
261 }
262}
263
264#ifdef CONFIG_PROC_FS
265
266static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
267{
268 struct ax25_route *ax25_rt;
269 int i = 1;
270
271 read_lock(&ax25_route_lock);
272 if (*pos == 0)
273 return SEQ_START_TOKEN;
274
275 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
276 if (i == *pos)
277 return ax25_rt;
278 ++i;
279 }
280
281 return NULL;
282}
283
284static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
285{
286 ++*pos;
287 return (v == SEQ_START_TOKEN) ? ax25_route_list :
288 ((struct ax25_route *) v)->next;
289}
290
291static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
292{
293 read_unlock(&ax25_route_lock);
294}
295
296static int ax25_rt_seq_show(struct seq_file *seq, void *v)
297{
Ralf Baechlef75268c2005-09-06 15:49:39 -0700298 char buf[11];
299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 if (v == SEQ_START_TOKEN)
301 seq_puts(seq, "callsign dev mode digipeaters\n");
302 else {
303 struct ax25_route *ax25_rt = v;
304 const char *callsign;
305 int i;
306
307 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
308 callsign = "default";
309 else
Ralf Baechlef75268c2005-09-06 15:49:39 -0700310 callsign = ax2asc(buf, &ax25_rt->callsign);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312 seq_printf(seq, "%-9s %-4s",
313 callsign,
314 ax25_rt->dev ? ax25_rt->dev->name : "???");
315
316 switch (ax25_rt->ip_mode) {
317 case 'V':
318 seq_puts(seq, " vc");
319 break;
320 case 'D':
321 seq_puts(seq, " dg");
322 break;
323 default:
324 seq_puts(seq, " *");
325 break;
326 }
327
328 if (ax25_rt->digipeat != NULL)
329 for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
Ralf Baechlef75268c2005-09-06 15:49:39 -0700330 seq_printf(seq, " %s",
331 ax2asc(buf, &ax25_rt->digipeat->calls[i]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333 seq_puts(seq, "\n");
334 }
335 return 0;
336}
337
338static struct seq_operations ax25_rt_seqops = {
339 .start = ax25_rt_seq_start,
340 .next = ax25_rt_seq_next,
341 .stop = ax25_rt_seq_stop,
342 .show = ax25_rt_seq_show,
343};
344
345static int ax25_rt_info_open(struct inode *inode, struct file *file)
346{
347 return seq_open(file, &ax25_rt_seqops);
348}
349
350struct file_operations ax25_route_fops = {
351 .owner = THIS_MODULE,
352 .open = ax25_rt_info_open,
353 .read = seq_read,
354 .llseek = seq_lseek,
355 .release = seq_release,
356};
357
358#endif
359
360/*
361 * Find AX.25 route
362 *
363 * Only routes with a refernce rout of zero can be destroyed.
364 */
365static ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
366{
367 ax25_route *ax25_spe_rt = NULL;
368 ax25_route *ax25_def_rt = NULL;
369 ax25_route *ax25_rt;
370
371 read_lock(&ax25_route_lock);
372 /*
373 * Bind to the physical interface we heard them on, or the default
374 * route if none is found;
375 */
376 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
377 if (dev == NULL) {
378 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
379 ax25_spe_rt = ax25_rt;
380 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
381 ax25_def_rt = ax25_rt;
382 } else {
383 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
384 ax25_spe_rt = ax25_rt;
385 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
386 ax25_def_rt = ax25_rt;
387 }
388 }
389
390 ax25_rt = ax25_def_rt;
391 if (ax25_spe_rt != NULL)
392 ax25_rt = ax25_spe_rt;
393
394 if (ax25_rt != NULL)
395 atomic_inc(&ax25_rt->ref);
396
397 read_unlock(&ax25_route_lock);
398
399 return ax25_rt;
400}
401
402/*
403 * Adjust path: If you specify a default route and want to connect
404 * a target on the digipeater path but w/o having a special route
405 * set before, the path has to be truncated from your target on.
406 */
407static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
408{
409 int k;
410
411 for (k = 0; k < digipeat->ndigi; k++) {
412 if (ax25cmp(addr, &digipeat->calls[k]) == 0)
413 break;
414 }
415
416 digipeat->ndigi = k;
417}
418
419
420/*
421 * Find which interface to use.
422 */
423int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
424{
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700425 ax25_uid_assoc *user;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 ax25_route *ax25_rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 int err;
428
429 if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
430 return -EHOSTUNREACH;
431
432 if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
433 err = -EHOSTUNREACH;
434 goto put;
435 }
436
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700437 user = ax25_findbyuid(current->euid);
438 if (user) {
439 ax25->source_addr = user->call;
440 ax25_uid_put(user);
441 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
443 err = -EPERM;
444 goto put;
445 }
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700446 ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 }
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 if (ax25_rt->digipeat != NULL) {
450 if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
451 err = -ENOMEM;
452 goto put;
453 }
454 memcpy(ax25->digipeat, ax25_rt->digipeat, sizeof(ax25_digi));
455 ax25_adjust_path(addr, ax25->digipeat);
456 }
457
458 if (ax25->sk != NULL) {
459 bh_lock_sock(ax25->sk);
460 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
461 bh_unlock_sock(ax25->sk);
462 }
463
464put:
465 ax25_put_route(ax25_rt);
466
467 return 0;
468}
469
470ax25_route *ax25_rt_find_route(ax25_route * route, ax25_address *addr,
471 struct net_device *dev)
472{
473 ax25_route *ax25_rt;
474
475 if ((ax25_rt = ax25_get_route(addr, dev)))
476 return ax25_rt;
477
478 route->next = NULL;
479 atomic_set(&route->ref, 1);
480 route->callsign = *addr;
481 route->dev = dev;
482 route->digipeat = NULL;
483 route->ip_mode = ' ';
484
485 return route;
486}
487
488struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
489 ax25_address *dest, ax25_digi *digi)
490{
491 struct sk_buff *skbn;
492 unsigned char *bp;
493 int len;
494
495 len = digi->ndigi * AX25_ADDR_LEN;
496
497 if (skb_headroom(skb) < len) {
498 if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
499 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
500 return NULL;
501 }
502
503 if (skb->sk != NULL)
504 skb_set_owner_w(skbn, skb->sk);
505
506 kfree_skb(skb);
507
508 skb = skbn;
509 }
510
511 bp = skb_push(skb, len);
512
513 ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
514
515 return skb;
516}
517
518/*
519 * Free all memory associated with routing structures.
520 */
521void __exit ax25_rt_free(void)
522{
523 ax25_route *s, *ax25_rt = ax25_route_list;
524
525 write_lock(&ax25_route_lock);
526 while (ax25_rt != NULL) {
527 s = ax25_rt;
528 ax25_rt = ax25_rt->next;
529
Jesper Juhla51482b2005-11-08 09:41:34 -0800530 kfree(s->digipeat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 kfree(s);
532 }
533 write_unlock(&ax25_route_lock);
534}