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1da177e4 LT |
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 | */ | |
4fc268d2 RD |
14 | |
15 | #include <linux/capability.h> | |
1da177e4 LT |
16 | #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 | ||
41 | static ax25_route *ax25_route_list; | |
42 | static DEFINE_RWLOCK(ax25_route_lock); | |
43 | ||
44 | static ax25_route *ax25_get_route(ax25_address *, struct net_device *); | |
45 | ||
46 | void 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; | |
a51482bd | 59 | kfree(s->digipeat); |
1da177e4 LT |
60 | 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; | |
a51482bd | 65 | kfree(s->digipeat); |
1da177e4 LT |
66 | kfree(s); |
67 | break; | |
68 | } | |
69 | } | |
70 | } | |
71 | } | |
72 | } | |
73 | write_unlock(&ax25_route_lock); | |
74 | } | |
75 | ||
76 | static 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) { | |
a51482bd JJ |
93 | kfree(ax25_rt->digipeat); |
94 | ax25_rt->digipeat = NULL; | |
1da177e4 LT |
95 | 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 | ||
143 | static void ax25_rt_destroy(ax25_route *ax25_rt) | |
144 | { | |
145 | if (atomic_read(&ax25_rt->ref) == 0) { | |
a51482bd | 146 | kfree(ax25_rt->digipeat); |
1da177e4 LT |
147 | 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 | ||
162 | static 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 | ||
197 | static 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 | ||
233 | out: | |
234 | write_unlock(&ax25_route_lock); | |
235 | return err; | |
236 | } | |
237 | ||
238 | int 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 | ||
266 | static 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 | ||
284 | static 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 | ||
291 | static void ax25_rt_seq_stop(struct seq_file *seq, void *v) | |
292 | { | |
293 | read_unlock(&ax25_route_lock); | |
294 | } | |
295 | ||
296 | static int ax25_rt_seq_show(struct seq_file *seq, void *v) | |
297 | { | |
f75268cd RB |
298 | char buf[11]; |
299 | ||
1da177e4 LT |
300 | 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 | |
f75268cd | 310 | callsign = ax2asc(buf, &ax25_rt->callsign); |
1da177e4 LT |
311 | |
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++) | |
f75268cd RB |
330 | seq_printf(seq, " %s", |
331 | ax2asc(buf, &ax25_rt->digipeat->calls[i])); | |
1da177e4 LT |
332 | |
333 | seq_puts(seq, "\n"); | |
334 | } | |
335 | return 0; | |
336 | } | |
337 | ||
338 | static 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 | ||
345 | static int ax25_rt_info_open(struct inode *inode, struct file *file) | |
346 | { | |
347 | return seq_open(file, &ax25_rt_seqops); | |
348 | } | |
349 | ||
350 | struct 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 | */ | |
365 | static 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 | */ | |
407 | static 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 | */ | |
423 | int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr) | |
424 | { | |
01d7dd0e | 425 | ax25_uid_assoc *user; |
1da177e4 | 426 | ax25_route *ax25_rt; |
1da177e4 LT |
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 | ||
01d7dd0e RB |
437 | user = ax25_findbyuid(current->euid); |
438 | if (user) { | |
439 | ax25->source_addr = user->call; | |
440 | ax25_uid_put(user); | |
441 | } else { | |
1da177e4 LT |
442 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
443 | err = -EPERM; | |
444 | goto put; | |
445 | } | |
01d7dd0e | 446 | ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr; |
1da177e4 LT |
447 | } |
448 | ||
1da177e4 LT |
449 | 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 | ||
464 | put: | |
465 | ax25_put_route(ax25_rt); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | ax25_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 | ||
488 | struct 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 | */ | |
521 | void __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 | ||
a51482bd | 530 | kfree(s->digipeat); |
1da177e4 LT |
531 | kfree(s); |
532 | } | |
533 | write_unlock(&ax25_route_lock); | |
534 | } |