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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 | |
15 | #include <linux/capability.h> |
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 <linux/slab.h> |
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> |
41 | |
42 | static ax25_route *ax25_route_list; |
43 | static DEFINE_RWLOCK(ax25_route_lock); |
44 | |
45 | void ax25_rt_device_down(struct net_device *dev) |
46 | { |
47 | ax25_route *s, *t, *ax25_rt; |
48 | |
49 | write_lock_bh(&ax25_route_lock); |
50 | ax25_rt = ax25_route_list; |
51 | while (ax25_rt != NULL) { |
52 | s = ax25_rt; |
53 | ax25_rt = ax25_rt->next; |
54 | |
55 | if (s->dev == dev) { |
56 | if (ax25_route_list == s) { |
57 | ax25_route_list = s->next; |
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 | kfree(s->digipeat); |
65 | kfree(s); |
66 | break; |
67 | } |
68 | } |
69 | } |
70 | } |
71 | } |
72 | write_unlock_bh(&ax25_route_lock); |
73 | } |
74 | |
75 | static int __must_check ax25_rt_add(struct ax25_routes_struct *route) |
76 | { |
77 | ax25_route *ax25_rt; |
78 | ax25_dev *ax25_dev; |
79 | int i; |
80 | |
81 | if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) |
82 | return -EINVAL; |
83 | if (route->digi_count > AX25_MAX_DIGIS) |
84 | return -EINVAL; |
85 | |
86 | write_lock_bh(&ax25_route_lock); |
87 | |
88 | ax25_rt = ax25_route_list; |
89 | while (ax25_rt != NULL) { |
90 | if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 && |
91 | ax25_rt->dev == ax25_dev->dev) { |
92 | kfree(ax25_rt->digipeat); |
93 | ax25_rt->digipeat = NULL; |
94 | if (route->digi_count != 0) { |
95 | if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { |
96 | write_unlock_bh(&ax25_route_lock); |
97 | return -ENOMEM; |
98 | } |
99 | ax25_rt->digipeat->lastrepeat = -1; |
100 | ax25_rt->digipeat->ndigi = route->digi_count; |
101 | for (i = 0; i < route->digi_count; i++) { |
102 | ax25_rt->digipeat->repeated[i] = 0; |
103 | ax25_rt->digipeat->calls[i] = route->digi_addr[i]; |
104 | } |
105 | } |
106 | write_unlock_bh(&ax25_route_lock); |
107 | return 0; |
108 | } |
109 | ax25_rt = ax25_rt->next; |
110 | } |
111 | |
112 | if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) { |
113 | write_unlock_bh(&ax25_route_lock); |
114 | return -ENOMEM; |
115 | } |
116 | |
117 | atomic_set(&ax25_rt->refcount, 1); |
118 | ax25_rt->callsign = route->dest_addr; |
119 | ax25_rt->dev = ax25_dev->dev; |
120 | ax25_rt->digipeat = NULL; |
121 | ax25_rt->ip_mode = ' '; |
122 | if (route->digi_count != 0) { |
123 | if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { |
124 | write_unlock_bh(&ax25_route_lock); |
125 | kfree(ax25_rt); |
126 | return -ENOMEM; |
127 | } |
128 | ax25_rt->digipeat->lastrepeat = -1; |
129 | ax25_rt->digipeat->ndigi = route->digi_count; |
130 | for (i = 0; i < route->digi_count; i++) { |
131 | ax25_rt->digipeat->repeated[i] = 0; |
132 | ax25_rt->digipeat->calls[i] = route->digi_addr[i]; |
133 | } |
134 | } |
135 | ax25_rt->next = ax25_route_list; |
136 | ax25_route_list = ax25_rt; |
137 | write_unlock_bh(&ax25_route_lock); |
138 | |
139 | return 0; |
140 | } |
141 | |
142 | void __ax25_put_route(ax25_route *ax25_rt) |
143 | { |
144 | kfree(ax25_rt->digipeat); |
145 | kfree(ax25_rt); |
146 | } |
147 | |
148 | static int ax25_rt_del(struct ax25_routes_struct *route) |
149 | { |
150 | ax25_route *s, *t, *ax25_rt; |
151 | ax25_dev *ax25_dev; |
152 | |
153 | if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) |
154 | return -EINVAL; |
155 | |
156 | write_lock_bh(&ax25_route_lock); |
157 | |
158 | ax25_rt = ax25_route_list; |
159 | while (ax25_rt != NULL) { |
160 | s = ax25_rt; |
161 | ax25_rt = ax25_rt->next; |
162 | if (s->dev == ax25_dev->dev && |
163 | ax25cmp(&route->dest_addr, &s->callsign) == 0) { |
164 | if (ax25_route_list == s) { |
165 | ax25_route_list = s->next; |
166 | ax25_put_route(s); |
167 | } else { |
168 | for (t = ax25_route_list; t != NULL; t = t->next) { |
169 | if (t->next == s) { |
170 | t->next = s->next; |
171 | ax25_put_route(s); |
172 | break; |
173 | } |
174 | } |
175 | } |
176 | } |
177 | } |
178 | write_unlock_bh(&ax25_route_lock); |
179 | |
180 | return 0; |
181 | } |
182 | |
183 | static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option) |
184 | { |
185 | ax25_route *ax25_rt; |
186 | ax25_dev *ax25_dev; |
187 | int err = 0; |
188 | |
189 | if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL) |
190 | return -EINVAL; |
191 | |
192 | write_lock_bh(&ax25_route_lock); |
193 | |
194 | ax25_rt = ax25_route_list; |
195 | while (ax25_rt != NULL) { |
196 | if (ax25_rt->dev == ax25_dev->dev && |
197 | ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) { |
198 | switch (rt_option->cmd) { |
199 | case AX25_SET_RT_IPMODE: |
200 | switch (rt_option->arg) { |
201 | case ' ': |
202 | case 'D': |
203 | case 'V': |
204 | ax25_rt->ip_mode = rt_option->arg; |
205 | break; |
206 | default: |
207 | err = -EINVAL; |
208 | goto out; |
209 | } |
210 | break; |
211 | default: |
212 | err = -EINVAL; |
213 | goto out; |
214 | } |
215 | } |
216 | ax25_rt = ax25_rt->next; |
217 | } |
218 | |
219 | out: |
220 | write_unlock_bh(&ax25_route_lock); |
221 | return err; |
222 | } |
223 | |
224 | int ax25_rt_ioctl(unsigned int cmd, void __user *arg) |
225 | { |
226 | struct ax25_route_opt_struct rt_option; |
227 | struct ax25_routes_struct route; |
228 | |
229 | switch (cmd) { |
230 | case SIOCADDRT: |
231 | if (copy_from_user(&route, arg, sizeof(route))) |
232 | return -EFAULT; |
233 | return ax25_rt_add(&route); |
234 | |
235 | case SIOCDELRT: |
236 | if (copy_from_user(&route, arg, sizeof(route))) |
237 | return -EFAULT; |
238 | return ax25_rt_del(&route); |
239 | |
240 | case SIOCAX25OPTRT: |
241 | if (copy_from_user(&rt_option, arg, sizeof(rt_option))) |
242 | return -EFAULT; |
243 | return ax25_rt_opt(&rt_option); |
244 | |
245 | default: |
246 | return -EINVAL; |
247 | } |
248 | } |
249 | |
250 | #ifdef CONFIG_PROC_FS |
251 | |
252 | static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos) |
253 | __acquires(ax25_route_lock) |
254 | { |
255 | struct ax25_route *ax25_rt; |
256 | int i = 1; |
257 | |
258 | read_lock(&ax25_route_lock); |
259 | if (*pos == 0) |
260 | return SEQ_START_TOKEN; |
261 | |
262 | for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { |
263 | if (i == *pos) |
264 | return ax25_rt; |
265 | ++i; |
266 | } |
267 | |
268 | return NULL; |
269 | } |
270 | |
271 | static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
272 | { |
273 | ++*pos; |
274 | return (v == SEQ_START_TOKEN) ? ax25_route_list : |
275 | ((struct ax25_route *) v)->next; |
276 | } |
277 | |
278 | static void ax25_rt_seq_stop(struct seq_file *seq, void *v) |
279 | __releases(ax25_route_lock) |
280 | { |
281 | read_unlock(&ax25_route_lock); |
282 | } |
283 | |
284 | static int ax25_rt_seq_show(struct seq_file *seq, void *v) |
285 | { |
286 | char buf[11]; |
287 | |
288 | if (v == SEQ_START_TOKEN) |
289 | seq_puts(seq, "callsign dev mode digipeaters\n"); |
290 | else { |
291 | struct ax25_route *ax25_rt = v; |
292 | const char *callsign; |
293 | int i; |
294 | |
295 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0) |
296 | callsign = "default"; |
297 | else |
298 | callsign = ax2asc(buf, &ax25_rt->callsign); |
299 | |
300 | seq_printf(seq, "%-9s %-4s", |
301 | callsign, |
302 | ax25_rt->dev ? ax25_rt->dev->name : "???"); |
303 | |
304 | switch (ax25_rt->ip_mode) { |
305 | case 'V': |
306 | seq_puts(seq, " vc"); |
307 | break; |
308 | case 'D': |
309 | seq_puts(seq, " dg"); |
310 | break; |
311 | default: |
312 | seq_puts(seq, " *"); |
313 | break; |
314 | } |
315 | |
316 | if (ax25_rt->digipeat != NULL) |
317 | for (i = 0; i < ax25_rt->digipeat->ndigi; i++) |
318 | seq_printf(seq, " %s", |
319 | ax2asc(buf, &ax25_rt->digipeat->calls[i])); |
320 | |
321 | seq_puts(seq, "\n"); |
322 | } |
323 | return 0; |
324 | } |
325 | |
326 | static const struct seq_operations ax25_rt_seqops = { |
327 | .start = ax25_rt_seq_start, |
328 | .next = ax25_rt_seq_next, |
329 | .stop = ax25_rt_seq_stop, |
330 | .show = ax25_rt_seq_show, |
331 | }; |
332 | |
333 | static int ax25_rt_info_open(struct inode *inode, struct file *file) |
334 | { |
335 | return seq_open(file, &ax25_rt_seqops); |
336 | } |
337 | |
338 | const struct file_operations ax25_route_fops = { |
339 | .owner = THIS_MODULE, |
340 | .open = ax25_rt_info_open, |
341 | .read = seq_read, |
342 | .llseek = seq_lseek, |
343 | .release = seq_release, |
344 | }; |
345 | |
346 | #endif |
347 | |
348 | /* |
349 | * Find AX.25 route |
350 | * |
351 | * Only routes with a reference count of zero can be destroyed. |
352 | */ |
353 | ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) |
354 | { |
355 | ax25_route *ax25_spe_rt = NULL; |
356 | ax25_route *ax25_def_rt = NULL; |
357 | ax25_route *ax25_rt; |
358 | |
359 | read_lock(&ax25_route_lock); |
360 | /* |
361 | * Bind to the physical interface we heard them on, or the default |
362 | * route if none is found; |
363 | */ |
364 | for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { |
365 | if (dev == NULL) { |
366 | if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL) |
367 | ax25_spe_rt = ax25_rt; |
368 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL) |
369 | ax25_def_rt = ax25_rt; |
370 | } else { |
371 | if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev) |
372 | ax25_spe_rt = ax25_rt; |
373 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev) |
374 | ax25_def_rt = ax25_rt; |
375 | } |
376 | } |
377 | |
378 | ax25_rt = ax25_def_rt; |
379 | if (ax25_spe_rt != NULL) |
380 | ax25_rt = ax25_spe_rt; |
381 | |
382 | if (ax25_rt != NULL) |
383 | ax25_hold_route(ax25_rt); |
384 | |
385 | read_unlock(&ax25_route_lock); |
386 | |
387 | return ax25_rt; |
388 | } |
389 | |
390 | /* |
391 | * Adjust path: If you specify a default route and want to connect |
392 | * a target on the digipeater path but w/o having a special route |
393 | * set before, the path has to be truncated from your target on. |
394 | */ |
395 | static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat) |
396 | { |
397 | int k; |
398 | |
399 | for (k = 0; k < digipeat->ndigi; k++) { |
400 | if (ax25cmp(addr, &digipeat->calls[k]) == 0) |
401 | break; |
402 | } |
403 | |
404 | digipeat->ndigi = k; |
405 | } |
406 | |
407 | |
408 | /* |
409 | * Find which interface to use. |
410 | */ |
411 | int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr) |
412 | { |
413 | ax25_uid_assoc *user; |
414 | ax25_route *ax25_rt; |
415 | int err; |
416 | |
417 | if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL) |
418 | return -EHOSTUNREACH; |
419 | |
420 | if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) { |
421 | err = -EHOSTUNREACH; |
422 | goto put; |
423 | } |
424 | |
425 | user = ax25_findbyuid(current_euid()); |
426 | if (user) { |
427 | ax25->source_addr = user->call; |
428 | ax25_uid_put(user); |
429 | } else { |
430 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
431 | err = -EPERM; |
432 | goto put; |
433 | } |
434 | ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr; |
435 | } |
436 | |
437 | if (ax25_rt->digipeat != NULL) { |
438 | ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi), |
439 | GFP_ATOMIC); |
440 | if (ax25->digipeat == NULL) { |
441 | err = -ENOMEM; |
442 | goto put; |
443 | } |
444 | ax25_adjust_path(addr, ax25->digipeat); |
445 | } |
446 | |
447 | if (ax25->sk != NULL) { |
448 | bh_lock_sock(ax25->sk); |
449 | sock_reset_flag(ax25->sk, SOCK_ZAPPED); |
450 | bh_unlock_sock(ax25->sk); |
451 | } |
452 | |
453 | put: |
454 | ax25_put_route(ax25_rt); |
455 | |
456 | return 0; |
457 | } |
458 | |
459 | struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src, |
460 | ax25_address *dest, ax25_digi *digi) |
461 | { |
462 | struct sk_buff *skbn; |
463 | unsigned char *bp; |
464 | int len; |
465 | |
466 | len = digi->ndigi * AX25_ADDR_LEN; |
467 | |
468 | if (skb_headroom(skb) < len) { |
469 | if ((skbn = skb_realloc_headroom(skb, len)) == NULL) { |
470 | printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n"); |
471 | return NULL; |
472 | } |
473 | |
474 | if (skb->sk != NULL) |
475 | skb_set_owner_w(skbn, skb->sk); |
476 | |
477 | kfree_skb(skb); |
478 | |
479 | skb = skbn; |
480 | } |
481 | |
482 | bp = skb_push(skb, len); |
483 | |
484 | ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS); |
485 | |
486 | return skb; |
487 | } |
488 | |
489 | /* |
490 | * Free all memory associated with routing structures. |
491 | */ |
492 | void __exit ax25_rt_free(void) |
493 | { |
494 | ax25_route *s, *ax25_rt = ax25_route_list; |
495 | |
496 | write_lock_bh(&ax25_route_lock); |
497 | while (ax25_rt != NULL) { |
498 | s = ax25_rt; |
499 | ax25_rt = ax25_rt->next; |
500 | |
501 | kfree(s->digipeat); |
502 | kfree(s); |
503 | } |
504 | write_unlock_bh(&ax25_route_lock); |
505 | } |
506 |
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