Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * |
4 | * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) | |
5 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
6 | * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org) | |
7 | * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) | |
8 | * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) | |
9 | * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) | |
10 | */ | |
4fc268d2 RD |
11 | |
12 | #include <linux/capability.h> | |
1da177e4 LT |
13 | #include <linux/errno.h> |
14 | #include <linux/types.h> | |
15 | #include <linux/socket.h> | |
16 | #include <linux/timer.h> | |
17 | #include <linux/in.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/sockios.h> | |
22 | #include <linux/net.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
1da177e4 LT |
32 | #include <linux/fcntl.h> |
33 | #include <linux/mm.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/seq_file.h> | |
bc3b2d7f | 37 | #include <linux/export.h> |
1da177e4 LT |
38 | |
39 | static ax25_route *ax25_route_list; | |
63530aba | 40 | DEFINE_RWLOCK(ax25_route_lock); |
1da177e4 | 41 | |
1da177e4 LT |
42 | void ax25_rt_device_down(struct net_device *dev) |
43 | { | |
44 | ax25_route *s, *t, *ax25_rt; | |
45 | ||
4de211f1 | 46 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
47 | ax25_rt = ax25_route_list; |
48 | while (ax25_rt != NULL) { | |
49 | s = ax25_rt; | |
50 | ax25_rt = ax25_rt->next; | |
51 | ||
52 | if (s->dev == dev) { | |
53 | if (ax25_route_list == s) { | |
54 | ax25_route_list = s->next; | |
a51482bd | 55 | kfree(s->digipeat); |
1da177e4 LT |
56 | kfree(s); |
57 | } else { | |
58 | for (t = ax25_route_list; t != NULL; t = t->next) { | |
59 | if (t->next == s) { | |
60 | t->next = s->next; | |
a51482bd | 61 | kfree(s->digipeat); |
1da177e4 LT |
62 | kfree(s); |
63 | break; | |
64 | } | |
65 | } | |
66 | } | |
67 | } | |
68 | } | |
4de211f1 | 69 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
70 | } |
71 | ||
c9266b99 | 72 | static int __must_check ax25_rt_add(struct ax25_routes_struct *route) |
1da177e4 LT |
73 | { |
74 | ax25_route *ax25_rt; | |
75 | ax25_dev *ax25_dev; | |
76 | int i; | |
77 | ||
1da177e4 LT |
78 | if (route->digi_count > AX25_MAX_DIGIS) |
79 | return -EINVAL; | |
80 | ||
87563a04 DZ |
81 | ax25_dev = ax25_addr_ax25dev(&route->port_addr); |
82 | if (!ax25_dev) | |
83 | return -EINVAL; | |
84 | ||
4de211f1 | 85 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
86 | |
87 | ax25_rt = ax25_route_list; | |
88 | while (ax25_rt != NULL) { | |
89 | if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 && | |
528930b9 | 90 | ax25_rt->dev == ax25_dev->dev) { |
a51482bd JJ |
91 | kfree(ax25_rt->digipeat); |
92 | ax25_rt->digipeat = NULL; | |
1da177e4 LT |
93 | if (route->digi_count != 0) { |
94 | if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { | |
4de211f1 | 95 | write_unlock_bh(&ax25_route_lock); |
87563a04 | 96 | ax25_dev_put(ax25_dev); |
1da177e4 LT |
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 | } | |
4de211f1 | 106 | write_unlock_bh(&ax25_route_lock); |
87563a04 | 107 | ax25_dev_put(ax25_dev); |
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); |
87563a04 | 115 | ax25_dev_put(ax25_dev); |
1da177e4 LT |
116 | return -ENOMEM; |
117 | } | |
118 | ||
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 | 126 | kfree(ax25_rt); |
87563a04 | 127 | ax25_dev_put(ax25_dev); |
1da177e4 LT |
128 | return -ENOMEM; |
129 | } | |
130 | ax25_rt->digipeat->lastrepeat = -1; | |
131 | ax25_rt->digipeat->ndigi = route->digi_count; | |
132 | for (i = 0; i < route->digi_count; i++) { | |
133 | ax25_rt->digipeat->repeated[i] = 0; | |
134 | ax25_rt->digipeat->calls[i] = route->digi_addr[i]; | |
135 | } | |
136 | } | |
137 | ax25_rt->next = ax25_route_list; | |
138 | ax25_route_list = ax25_rt; | |
4de211f1 | 139 | write_unlock_bh(&ax25_route_lock); |
87563a04 | 140 | ax25_dev_put(ax25_dev); |
1da177e4 LT |
141 | |
142 | return 0; | |
143 | } | |
144 | ||
006f68b8 | 145 | void __ax25_put_route(ax25_route *ax25_rt) |
1da177e4 | 146 | { |
006f68b8 RBD |
147 | kfree(ax25_rt->digipeat); |
148 | kfree(ax25_rt); | |
1da177e4 LT |
149 | } |
150 | ||
151 | static int ax25_rt_del(struct ax25_routes_struct *route) | |
152 | { | |
153 | ax25_route *s, *t, *ax25_rt; | |
154 | ax25_dev *ax25_dev; | |
155 | ||
156 | if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) | |
157 | return -EINVAL; | |
158 | ||
4de211f1 | 159 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
160 | |
161 | ax25_rt = ax25_route_list; | |
162 | while (ax25_rt != NULL) { | |
163 | s = ax25_rt; | |
164 | ax25_rt = ax25_rt->next; | |
165 | if (s->dev == ax25_dev->dev && | |
166 | ax25cmp(&route->dest_addr, &s->callsign) == 0) { | |
167 | if (ax25_route_list == s) { | |
168 | ax25_route_list = s->next; | |
560e08ed | 169 | __ax25_put_route(s); |
1da177e4 LT |
170 | } else { |
171 | for (t = ax25_route_list; t != NULL; t = t->next) { | |
172 | if (t->next == s) { | |
173 | t->next = s->next; | |
560e08ed | 174 | __ax25_put_route(s); |
1da177e4 LT |
175 | break; |
176 | } | |
177 | } | |
178 | } | |
179 | } | |
180 | } | |
4de211f1 | 181 | write_unlock_bh(&ax25_route_lock); |
87563a04 | 182 | ax25_dev_put(ax25_dev); |
1da177e4 LT |
183 | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option) | |
188 | { | |
189 | ax25_route *ax25_rt; | |
190 | ax25_dev *ax25_dev; | |
191 | int err = 0; | |
192 | ||
193 | if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL) | |
194 | return -EINVAL; | |
195 | ||
4de211f1 | 196 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
197 | |
198 | ax25_rt = ax25_route_list; | |
199 | while (ax25_rt != NULL) { | |
200 | if (ax25_rt->dev == ax25_dev->dev && | |
201 | ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) { | |
202 | switch (rt_option->cmd) { | |
203 | case AX25_SET_RT_IPMODE: | |
204 | switch (rt_option->arg) { | |
205 | case ' ': | |
206 | case 'D': | |
207 | case 'V': | |
208 | ax25_rt->ip_mode = rt_option->arg; | |
209 | break; | |
210 | default: | |
211 | err = -EINVAL; | |
212 | goto out; | |
213 | } | |
214 | break; | |
215 | default: | |
216 | err = -EINVAL; | |
217 | goto out; | |
218 | } | |
219 | } | |
220 | ax25_rt = ax25_rt->next; | |
221 | } | |
222 | ||
223 | out: | |
4de211f1 | 224 | write_unlock_bh(&ax25_route_lock); |
87563a04 | 225 | ax25_dev_put(ax25_dev); |
1da177e4 LT |
226 | return err; |
227 | } | |
228 | ||
229 | int ax25_rt_ioctl(unsigned int cmd, void __user *arg) | |
230 | { | |
231 | struct ax25_route_opt_struct rt_option; | |
232 | struct ax25_routes_struct route; | |
233 | ||
234 | switch (cmd) { | |
235 | case SIOCADDRT: | |
236 | if (copy_from_user(&route, arg, sizeof(route))) | |
237 | return -EFAULT; | |
238 | return ax25_rt_add(&route); | |
239 | ||
240 | case SIOCDELRT: | |
241 | if (copy_from_user(&route, arg, sizeof(route))) | |
242 | return -EFAULT; | |
243 | return ax25_rt_del(&route); | |
244 | ||
245 | case SIOCAX25OPTRT: | |
246 | if (copy_from_user(&rt_option, arg, sizeof(rt_option))) | |
247 | return -EFAULT; | |
248 | return ax25_rt_opt(&rt_option); | |
249 | ||
250 | default: | |
251 | return -EINVAL; | |
252 | } | |
253 | } | |
254 | ||
255 | #ifdef CONFIG_PROC_FS | |
256 | ||
257 | static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos) | |
f16f3026 | 258 | __acquires(ax25_route_lock) |
1da177e4 LT |
259 | { |
260 | struct ax25_route *ax25_rt; | |
261 | int i = 1; | |
528930b9 YH |
262 | |
263 | read_lock(&ax25_route_lock); | |
1da177e4 LT |
264 | if (*pos == 0) |
265 | return SEQ_START_TOKEN; | |
266 | ||
267 | for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { | |
268 | if (i == *pos) | |
269 | return ax25_rt; | |
270 | ++i; | |
271 | } | |
272 | ||
273 | return NULL; | |
274 | } | |
275 | ||
276 | static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
277 | { | |
278 | ++*pos; | |
528930b9 | 279 | return (v == SEQ_START_TOKEN) ? ax25_route_list : |
1da177e4 LT |
280 | ((struct ax25_route *) v)->next; |
281 | } | |
282 | ||
283 | static void ax25_rt_seq_stop(struct seq_file *seq, void *v) | |
f16f3026 | 284 | __releases(ax25_route_lock) |
1da177e4 LT |
285 | { |
286 | read_unlock(&ax25_route_lock); | |
287 | } | |
288 | ||
289 | static int ax25_rt_seq_show(struct seq_file *seq, void *v) | |
290 | { | |
f75268cd RB |
291 | char buf[11]; |
292 | ||
1da177e4 LT |
293 | if (v == SEQ_START_TOKEN) |
294 | seq_puts(seq, "callsign dev mode digipeaters\n"); | |
295 | else { | |
296 | struct ax25_route *ax25_rt = v; | |
297 | const char *callsign; | |
298 | int i; | |
299 | ||
300 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0) | |
301 | callsign = "default"; | |
302 | else | |
f75268cd | 303 | callsign = ax2asc(buf, &ax25_rt->callsign); |
1da177e4 LT |
304 | |
305 | seq_printf(seq, "%-9s %-4s", | |
306 | callsign, | |
307 | ax25_rt->dev ? ax25_rt->dev->name : "???"); | |
308 | ||
309 | switch (ax25_rt->ip_mode) { | |
310 | case 'V': | |
311 | seq_puts(seq, " vc"); | |
312 | break; | |
313 | case 'D': | |
314 | seq_puts(seq, " dg"); | |
315 | break; | |
316 | default: | |
317 | seq_puts(seq, " *"); | |
318 | break; | |
319 | } | |
320 | ||
321 | if (ax25_rt->digipeat != NULL) | |
322 | for (i = 0; i < ax25_rt->digipeat->ndigi; i++) | |
f75268cd RB |
323 | seq_printf(seq, " %s", |
324 | ax2asc(buf, &ax25_rt->digipeat->calls[i])); | |
1da177e4 LT |
325 | |
326 | seq_puts(seq, "\n"); | |
327 | } | |
328 | return 0; | |
329 | } | |
330 | ||
fddda2b7 | 331 | const struct seq_operations ax25_rt_seqops = { |
1da177e4 LT |
332 | .start = ax25_rt_seq_start, |
333 | .next = ax25_rt_seq_next, | |
334 | .stop = ax25_rt_seq_stop, | |
335 | .show = ax25_rt_seq_show, | |
336 | }; | |
1da177e4 LT |
337 | #endif |
338 | ||
339 | /* | |
340 | * Find AX.25 route | |
341 | * | |
3f072310 | 342 | * Only routes with a reference count of zero can be destroyed. |
63530aba | 343 | * Must be called with ax25_route_lock read locked. |
1da177e4 | 344 | */ |
006f68b8 | 345 | ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) |
1da177e4 LT |
346 | { |
347 | ax25_route *ax25_spe_rt = NULL; | |
348 | ax25_route *ax25_def_rt = NULL; | |
349 | ax25_route *ax25_rt; | |
350 | ||
1da177e4 LT |
351 | /* |
352 | * Bind to the physical interface we heard them on, or the default | |
353 | * route if none is found; | |
354 | */ | |
355 | for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { | |
356 | if (dev == NULL) { | |
357 | if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL) | |
358 | ax25_spe_rt = ax25_rt; | |
359 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL) | |
360 | ax25_def_rt = ax25_rt; | |
361 | } else { | |
362 | if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev) | |
363 | ax25_spe_rt = ax25_rt; | |
364 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev) | |
365 | ax25_def_rt = ax25_rt; | |
366 | } | |
367 | } | |
368 | ||
369 | ax25_rt = ax25_def_rt; | |
370 | if (ax25_spe_rt != NULL) | |
371 | ax25_rt = ax25_spe_rt; | |
372 | ||
1da177e4 LT |
373 | return ax25_rt; |
374 | } | |
375 | ||
376 | /* | |
377 | * Adjust path: If you specify a default route and want to connect | |
378 | * a target on the digipeater path but w/o having a special route | |
379 | * set before, the path has to be truncated from your target on. | |
380 | */ | |
381 | static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat) | |
382 | { | |
383 | int k; | |
384 | ||
385 | for (k = 0; k < digipeat->ndigi; k++) { | |
386 | if (ax25cmp(addr, &digipeat->calls[k]) == 0) | |
387 | break; | |
388 | } | |
389 | ||
390 | digipeat->ndigi = k; | |
391 | } | |
392 | ||
393 | ||
394 | /* | |
395 | * Find which interface to use. | |
396 | */ | |
397 | int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr) | |
398 | { | |
01d7dd0e | 399 | ax25_uid_assoc *user; |
1da177e4 | 400 | ax25_route *ax25_rt; |
b3d18f15 | 401 | int err = 0; |
1da177e4 | 402 | |
63530aba ED |
403 | ax25_route_lock_use(); |
404 | ax25_rt = ax25_get_route(addr, NULL); | |
405 | if (!ax25_rt) { | |
406 | ax25_route_lock_unuse(); | |
1da177e4 | 407 | return -EHOSTUNREACH; |
63530aba | 408 | } |
1da177e4 LT |
409 | if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) { |
410 | err = -EHOSTUNREACH; | |
411 | goto put; | |
412 | } | |
413 | ||
73400407 | 414 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
415 | if (user) { |
416 | ax25->source_addr = user->call; | |
417 | ax25_uid_put(user); | |
418 | } else { | |
1da177e4 LT |
419 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
420 | err = -EPERM; | |
421 | goto put; | |
422 | } | |
01d7dd0e | 423 | ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr; |
1da177e4 LT |
424 | } |
425 | ||
1da177e4 | 426 | if (ax25_rt->digipeat != NULL) { |
0459d70a ACM |
427 | ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi), |
428 | GFP_ATOMIC); | |
429 | if (ax25->digipeat == NULL) { | |
1da177e4 LT |
430 | err = -ENOMEM; |
431 | goto put; | |
432 | } | |
1da177e4 LT |
433 | ax25_adjust_path(addr, ax25->digipeat); |
434 | } | |
435 | ||
436 | if (ax25->sk != NULL) { | |
d4d5d8e8 | 437 | local_bh_disable(); |
1da177e4 LT |
438 | bh_lock_sock(ax25->sk); |
439 | sock_reset_flag(ax25->sk, SOCK_ZAPPED); | |
440 | bh_unlock_sock(ax25->sk); | |
d4d5d8e8 | 441 | local_bh_enable(); |
1da177e4 LT |
442 | } |
443 | ||
444 | put: | |
63530aba | 445 | ax25_route_lock_unuse(); |
b3d18f15 | 446 | return err; |
1da177e4 LT |
447 | } |
448 | ||
1da177e4 LT |
449 | struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src, |
450 | ax25_address *dest, ax25_digi *digi) | |
451 | { | |
1da177e4 LT |
452 | unsigned char *bp; |
453 | int len; | |
454 | ||
455 | len = digi->ndigi * AX25_ADDR_LEN; | |
456 | ||
53744a4a VA |
457 | if (unlikely(skb_headroom(skb) < len)) { |
458 | skb = skb_expand_head(skb, len); | |
459 | if (!skb) { | |
1da177e4 LT |
460 | printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n"); |
461 | return NULL; | |
462 | } | |
1da177e4 LT |
463 | } |
464 | ||
465 | bp = skb_push(skb, len); | |
466 | ||
467 | ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS); | |
468 | ||
469 | return skb; | |
470 | } | |
471 | ||
472 | /* | |
473 | * Free all memory associated with routing structures. | |
474 | */ | |
475 | void __exit ax25_rt_free(void) | |
476 | { | |
477 | ax25_route *s, *ax25_rt = ax25_route_list; | |
478 | ||
4de211f1 | 479 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
480 | while (ax25_rt != NULL) { |
481 | s = ax25_rt; | |
482 | ax25_rt = ax25_rt->next; | |
483 | ||
a51482bd | 484 | kfree(s->digipeat); |
1da177e4 LT |
485 | kfree(s); |
486 | } | |
4de211f1 | 487 | write_unlock_bh(&ax25_route_lock); |
1da177e4 | 488 | } |