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-rw-r--r--net/ax25/ax25_route.c534
1 files changed, 534 insertions, 0 deletions
diff --git a/net/ax25/ax25_route.c b/net/ax25/ax25_route.c
new file mode 100644
index 000000000000..44b99b1ff9f8
--- /dev/null
+++ b/net/ax25/ax25_route.c
@@ -0,0 +1,534 @@
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 (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{
301 if (v == SEQ_START_TOKEN)
302 seq_puts(seq, "callsign dev mode digipeaters\n");
303 else {
304 struct ax25_route *ax25_rt = v;
305 const char *callsign;
306 int i;
307
308 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
309 callsign = "default";
310 else
311 callsign = ax2asc(&ax25_rt->callsign);
312
313 seq_printf(seq, "%-9s %-4s",
314 callsign,
315 ax25_rt->dev ? ax25_rt->dev->name : "???");
316
317 switch (ax25_rt->ip_mode) {
318 case 'V':
319 seq_puts(seq, " vc");
320 break;
321 case 'D':
322 seq_puts(seq, " dg");
323 break;
324 default:
325 seq_puts(seq, " *");
326 break;
327 }
328
329 if (ax25_rt->digipeat != NULL)
330 for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
331 seq_printf(seq, " %s", ax2asc(&ax25_rt->digipeat->calls[i]));
332
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{
425 ax25_route *ax25_rt;
426 ax25_address *call;
427 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
437 if ((call = ax25_findbyuid(current->euid)) == NULL) {
438 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
439 err = -EPERM;
440 goto put;
441 }
442 call = (ax25_address *)ax25->ax25_dev->dev->dev_addr;
443 }
444
445 ax25->source_addr = *call;
446
447 if (ax25_rt->digipeat != NULL) {
448 if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
449 err = -ENOMEM;
450 goto put;
451 }
452 memcpy(ax25->digipeat, ax25_rt->digipeat, sizeof(ax25_digi));
453 ax25_adjust_path(addr, ax25->digipeat);
454 }
455
456 if (ax25->sk != NULL) {
457 bh_lock_sock(ax25->sk);
458 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
459 bh_unlock_sock(ax25->sk);
460 }
461
462put:
463 ax25_put_route(ax25_rt);
464
465 return 0;
466}
467
468ax25_route *ax25_rt_find_route(ax25_route * route, ax25_address *addr,
469 struct net_device *dev)
470{
471 ax25_route *ax25_rt;
472
473 if ((ax25_rt = ax25_get_route(addr, dev)))
474 return ax25_rt;
475
476 route->next = NULL;
477 atomic_set(&route->ref, 1);
478 route->callsign = *addr;
479 route->dev = dev;
480 route->digipeat = NULL;
481 route->ip_mode = ' ';
482
483 return route;
484}
485
486struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
487 ax25_address *dest, ax25_digi *digi)
488{
489 struct sk_buff *skbn;
490 unsigned char *bp;
491 int len;
492
493 len = digi->ndigi * AX25_ADDR_LEN;
494
495 if (skb_headroom(skb) < len) {
496 if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
497 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
498 return NULL;
499 }
500
501 if (skb->sk != NULL)
502 skb_set_owner_w(skbn, skb->sk);
503
504 kfree_skb(skb);
505
506 skb = skbn;
507 }
508
509 bp = skb_push(skb, len);
510
511 ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
512
513 return skb;
514}
515
516/*
517 * Free all memory associated with routing structures.
518 */
519void __exit ax25_rt_free(void)
520{
521 ax25_route *s, *ax25_rt = ax25_route_list;
522
523 write_lock(&ax25_route_lock);
524 while (ax25_rt != NULL) {
525 s = ax25_rt;
526 ax25_rt = ax25_rt->next;
527
528 if (s->digipeat != NULL)
529 kfree(s->digipeat);
530
531 kfree(s);
532 }
533 write_unlock(&ax25_route_lock);
534}
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