Commit | Line | Data |
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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> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 LT |
27 | #include <net/ax25.h> |
28 | #include <linux/inet.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/if_arp.h> | |
31 | #include <linux/skbuff.h> | |
32 | #include <linux/spinlock.h> | |
33 | #include <net/sock.h> | |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/system.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/seq_file.h> | |
bc3b2d7f | 41 | #include <linux/export.h> |
1da177e4 LT |
42 | |
43 | static ax25_route *ax25_route_list; | |
44 | static DEFINE_RWLOCK(ax25_route_lock); | |
45 | ||
1da177e4 LT |
46 | void ax25_rt_device_down(struct net_device *dev) |
47 | { | |
48 | ax25_route *s, *t, *ax25_rt; | |
49 | ||
4de211f1 | 50 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
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 | } | |
4de211f1 | 73 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
74 | } |
75 | ||
c9266b99 | 76 | static int __must_check ax25_rt_add(struct ax25_routes_struct *route) |
1da177e4 LT |
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 | ||
4de211f1 | 87 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
88 | |
89 | ax25_rt = ax25_route_list; | |
90 | while (ax25_rt != NULL) { | |
91 | if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 && | |
528930b9 | 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) { | |
4de211f1 | 97 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
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 | } | |
4de211f1 | 107 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
108 | return 0; |
109 | } | |
110 | ax25_rt = ax25_rt->next; | |
111 | } | |
112 | ||
113 | if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) { | |
4de211f1 | 114 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
115 | return -ENOMEM; |
116 | } | |
117 | ||
006f68b8 | 118 | atomic_set(&ax25_rt->refcount, 1); |
1da177e4 LT |
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) { | |
4de211f1 | 125 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
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; | |
4de211f1 | 138 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
139 | |
140 | return 0; | |
141 | } | |
142 | ||
006f68b8 | 143 | void __ax25_put_route(ax25_route *ax25_rt) |
1da177e4 | 144 | { |
006f68b8 RBD |
145 | kfree(ax25_rt->digipeat); |
146 | kfree(ax25_rt); | |
1da177e4 LT |
147 | } |
148 | ||
149 | static int ax25_rt_del(struct ax25_routes_struct *route) | |
150 | { | |
151 | ax25_route *s, *t, *ax25_rt; | |
152 | ax25_dev *ax25_dev; | |
153 | ||
154 | if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) | |
155 | return -EINVAL; | |
156 | ||
4de211f1 | 157 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
158 | |
159 | ax25_rt = ax25_route_list; | |
160 | while (ax25_rt != NULL) { | |
161 | s = ax25_rt; | |
162 | ax25_rt = ax25_rt->next; | |
163 | if (s->dev == ax25_dev->dev && | |
164 | ax25cmp(&route->dest_addr, &s->callsign) == 0) { | |
165 | if (ax25_route_list == s) { | |
166 | ax25_route_list = s->next; | |
006f68b8 | 167 | ax25_put_route(s); |
1da177e4 LT |
168 | } else { |
169 | for (t = ax25_route_list; t != NULL; t = t->next) { | |
170 | if (t->next == s) { | |
171 | t->next = s->next; | |
006f68b8 | 172 | ax25_put_route(s); |
1da177e4 LT |
173 | break; |
174 | } | |
175 | } | |
176 | } | |
177 | } | |
178 | } | |
4de211f1 | 179 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
180 | |
181 | return 0; | |
182 | } | |
183 | ||
184 | static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option) | |
185 | { | |
186 | ax25_route *ax25_rt; | |
187 | ax25_dev *ax25_dev; | |
188 | int err = 0; | |
189 | ||
190 | if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL) | |
191 | return -EINVAL; | |
192 | ||
4de211f1 | 193 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
194 | |
195 | ax25_rt = ax25_route_list; | |
196 | while (ax25_rt != NULL) { | |
197 | if (ax25_rt->dev == ax25_dev->dev && | |
198 | ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) { | |
199 | switch (rt_option->cmd) { | |
200 | case AX25_SET_RT_IPMODE: | |
201 | switch (rt_option->arg) { | |
202 | case ' ': | |
203 | case 'D': | |
204 | case 'V': | |
205 | ax25_rt->ip_mode = rt_option->arg; | |
206 | break; | |
207 | default: | |
208 | err = -EINVAL; | |
209 | goto out; | |
210 | } | |
211 | break; | |
212 | default: | |
213 | err = -EINVAL; | |
214 | goto out; | |
215 | } | |
216 | } | |
217 | ax25_rt = ax25_rt->next; | |
218 | } | |
219 | ||
220 | out: | |
4de211f1 | 221 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
222 | return err; |
223 | } | |
224 | ||
225 | int ax25_rt_ioctl(unsigned int cmd, void __user *arg) | |
226 | { | |
227 | struct ax25_route_opt_struct rt_option; | |
228 | struct ax25_routes_struct route; | |
229 | ||
230 | switch (cmd) { | |
231 | case SIOCADDRT: | |
232 | if (copy_from_user(&route, arg, sizeof(route))) | |
233 | return -EFAULT; | |
234 | return ax25_rt_add(&route); | |
235 | ||
236 | case SIOCDELRT: | |
237 | if (copy_from_user(&route, arg, sizeof(route))) | |
238 | return -EFAULT; | |
239 | return ax25_rt_del(&route); | |
240 | ||
241 | case SIOCAX25OPTRT: | |
242 | if (copy_from_user(&rt_option, arg, sizeof(rt_option))) | |
243 | return -EFAULT; | |
244 | return ax25_rt_opt(&rt_option); | |
245 | ||
246 | default: | |
247 | return -EINVAL; | |
248 | } | |
249 | } | |
250 | ||
251 | #ifdef CONFIG_PROC_FS | |
252 | ||
253 | static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos) | |
f16f3026 | 254 | __acquires(ax25_route_lock) |
1da177e4 LT |
255 | { |
256 | struct ax25_route *ax25_rt; | |
257 | int i = 1; | |
528930b9 YH |
258 | |
259 | read_lock(&ax25_route_lock); | |
1da177e4 LT |
260 | if (*pos == 0) |
261 | return SEQ_START_TOKEN; | |
262 | ||
263 | for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { | |
264 | if (i == *pos) | |
265 | return ax25_rt; | |
266 | ++i; | |
267 | } | |
268 | ||
269 | return NULL; | |
270 | } | |
271 | ||
272 | static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
273 | { | |
274 | ++*pos; | |
528930b9 | 275 | return (v == SEQ_START_TOKEN) ? ax25_route_list : |
1da177e4 LT |
276 | ((struct ax25_route *) v)->next; |
277 | } | |
278 | ||
279 | static void ax25_rt_seq_stop(struct seq_file *seq, void *v) | |
f16f3026 | 280 | __releases(ax25_route_lock) |
1da177e4 LT |
281 | { |
282 | read_unlock(&ax25_route_lock); | |
283 | } | |
284 | ||
285 | static int ax25_rt_seq_show(struct seq_file *seq, void *v) | |
286 | { | |
f75268cd RB |
287 | char buf[11]; |
288 | ||
1da177e4 LT |
289 | if (v == SEQ_START_TOKEN) |
290 | seq_puts(seq, "callsign dev mode digipeaters\n"); | |
291 | else { | |
292 | struct ax25_route *ax25_rt = v; | |
293 | const char *callsign; | |
294 | int i; | |
295 | ||
296 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0) | |
297 | callsign = "default"; | |
298 | else | |
f75268cd | 299 | callsign = ax2asc(buf, &ax25_rt->callsign); |
1da177e4 LT |
300 | |
301 | seq_printf(seq, "%-9s %-4s", | |
302 | callsign, | |
303 | ax25_rt->dev ? ax25_rt->dev->name : "???"); | |
304 | ||
305 | switch (ax25_rt->ip_mode) { | |
306 | case 'V': | |
307 | seq_puts(seq, " vc"); | |
308 | break; | |
309 | case 'D': | |
310 | seq_puts(seq, " dg"); | |
311 | break; | |
312 | default: | |
313 | seq_puts(seq, " *"); | |
314 | break; | |
315 | } | |
316 | ||
317 | if (ax25_rt->digipeat != NULL) | |
318 | for (i = 0; i < ax25_rt->digipeat->ndigi; i++) | |
f75268cd RB |
319 | seq_printf(seq, " %s", |
320 | ax2asc(buf, &ax25_rt->digipeat->calls[i])); | |
1da177e4 LT |
321 | |
322 | seq_puts(seq, "\n"); | |
323 | } | |
324 | return 0; | |
325 | } | |
326 | ||
56b3d975 | 327 | static const struct seq_operations ax25_rt_seqops = { |
1da177e4 LT |
328 | .start = ax25_rt_seq_start, |
329 | .next = ax25_rt_seq_next, | |
330 | .stop = ax25_rt_seq_stop, | |
331 | .show = ax25_rt_seq_show, | |
332 | }; | |
333 | ||
334 | static int ax25_rt_info_open(struct inode *inode, struct file *file) | |
335 | { | |
336 | return seq_open(file, &ax25_rt_seqops); | |
337 | } | |
338 | ||
9a32144e | 339 | const struct file_operations ax25_route_fops = { |
1da177e4 LT |
340 | .owner = THIS_MODULE, |
341 | .open = ax25_rt_info_open, | |
342 | .read = seq_read, | |
343 | .llseek = seq_lseek, | |
344 | .release = seq_release, | |
345 | }; | |
346 | ||
347 | #endif | |
348 | ||
349 | /* | |
350 | * Find AX.25 route | |
351 | * | |
3f072310 | 352 | * Only routes with a reference count of zero can be destroyed. |
1da177e4 | 353 | */ |
006f68b8 | 354 | ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) |
1da177e4 LT |
355 | { |
356 | ax25_route *ax25_spe_rt = NULL; | |
357 | ax25_route *ax25_def_rt = NULL; | |
358 | ax25_route *ax25_rt; | |
359 | ||
360 | read_lock(&ax25_route_lock); | |
361 | /* | |
362 | * Bind to the physical interface we heard them on, or the default | |
363 | * route if none is found; | |
364 | */ | |
365 | for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { | |
366 | if (dev == NULL) { | |
367 | if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL) | |
368 | ax25_spe_rt = ax25_rt; | |
369 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL) | |
370 | ax25_def_rt = ax25_rt; | |
371 | } else { | |
372 | if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev) | |
373 | ax25_spe_rt = ax25_rt; | |
374 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev) | |
375 | ax25_def_rt = ax25_rt; | |
376 | } | |
377 | } | |
378 | ||
379 | ax25_rt = ax25_def_rt; | |
380 | if (ax25_spe_rt != NULL) | |
381 | ax25_rt = ax25_spe_rt; | |
382 | ||
383 | if (ax25_rt != NULL) | |
006f68b8 | 384 | ax25_hold_route(ax25_rt); |
1da177e4 LT |
385 | |
386 | read_unlock(&ax25_route_lock); | |
387 | ||
388 | return ax25_rt; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Adjust path: If you specify a default route and want to connect | |
393 | * a target on the digipeater path but w/o having a special route | |
394 | * set before, the path has to be truncated from your target on. | |
395 | */ | |
396 | static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat) | |
397 | { | |
398 | int k; | |
399 | ||
400 | for (k = 0; k < digipeat->ndigi; k++) { | |
401 | if (ax25cmp(addr, &digipeat->calls[k]) == 0) | |
402 | break; | |
403 | } | |
404 | ||
405 | digipeat->ndigi = k; | |
406 | } | |
407 | ||
408 | ||
409 | /* | |
410 | * Find which interface to use. | |
411 | */ | |
412 | int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr) | |
413 | { | |
01d7dd0e | 414 | ax25_uid_assoc *user; |
1da177e4 | 415 | ax25_route *ax25_rt; |
b3d18f15 | 416 | int err = 0; |
1da177e4 LT |
417 | |
418 | if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL) | |
419 | return -EHOSTUNREACH; | |
420 | ||
421 | if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) { | |
422 | err = -EHOSTUNREACH; | |
423 | goto put; | |
424 | } | |
425 | ||
73400407 | 426 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
427 | if (user) { |
428 | ax25->source_addr = user->call; | |
429 | ax25_uid_put(user); | |
430 | } else { | |
1da177e4 LT |
431 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
432 | err = -EPERM; | |
433 | goto put; | |
434 | } | |
01d7dd0e | 435 | ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr; |
1da177e4 LT |
436 | } |
437 | ||
1da177e4 | 438 | if (ax25_rt->digipeat != NULL) { |
0459d70a ACM |
439 | ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi), |
440 | GFP_ATOMIC); | |
441 | if (ax25->digipeat == NULL) { | |
1da177e4 LT |
442 | err = -ENOMEM; |
443 | goto put; | |
444 | } | |
1da177e4 LT |
445 | ax25_adjust_path(addr, ax25->digipeat); |
446 | } | |
447 | ||
448 | if (ax25->sk != NULL) { | |
449 | bh_lock_sock(ax25->sk); | |
450 | sock_reset_flag(ax25->sk, SOCK_ZAPPED); | |
451 | bh_unlock_sock(ax25->sk); | |
452 | } | |
453 | ||
454 | put: | |
455 | ax25_put_route(ax25_rt); | |
456 | ||
b3d18f15 | 457 | return err; |
1da177e4 LT |
458 | } |
459 | ||
1da177e4 LT |
460 | struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src, |
461 | ax25_address *dest, ax25_digi *digi) | |
462 | { | |
463 | struct sk_buff *skbn; | |
464 | unsigned char *bp; | |
465 | int len; | |
466 | ||
467 | len = digi->ndigi * AX25_ADDR_LEN; | |
468 | ||
469 | if (skb_headroom(skb) < len) { | |
470 | if ((skbn = skb_realloc_headroom(skb, len)) == NULL) { | |
471 | printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n"); | |
472 | return NULL; | |
473 | } | |
474 | ||
475 | if (skb->sk != NULL) | |
476 | skb_set_owner_w(skbn, skb->sk); | |
477 | ||
478 | kfree_skb(skb); | |
479 | ||
480 | skb = skbn; | |
481 | } | |
482 | ||
483 | bp = skb_push(skb, len); | |
484 | ||
485 | ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS); | |
486 | ||
487 | return skb; | |
488 | } | |
489 | ||
490 | /* | |
491 | * Free all memory associated with routing structures. | |
492 | */ | |
493 | void __exit ax25_rt_free(void) | |
494 | { | |
495 | ax25_route *s, *ax25_rt = ax25_route_list; | |
496 | ||
4de211f1 | 497 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
498 | while (ax25_rt != NULL) { |
499 | s = ax25_rt; | |
500 | ax25_rt = ax25_rt->next; | |
501 | ||
a51482bd | 502 | kfree(s->digipeat); |
1da177e4 LT |
503 | kfree(s); |
504 | } | |
4de211f1 | 505 | write_unlock_bh(&ax25_route_lock); |
1da177e4 | 506 | } |