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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 | ||
78 | if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) | |
79 | return -EINVAL; | |
80 | if (route->digi_count > AX25_MAX_DIGIS) | |
81 | return -EINVAL; | |
82 | ||
4de211f1 | 83 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
84 | |
85 | ax25_rt = ax25_route_list; | |
86 | while (ax25_rt != NULL) { | |
87 | if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 && | |
528930b9 | 88 | ax25_rt->dev == ax25_dev->dev) { |
a51482bd JJ |
89 | kfree(ax25_rt->digipeat); |
90 | ax25_rt->digipeat = NULL; | |
1da177e4 LT |
91 | if (route->digi_count != 0) { |
92 | if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { | |
4de211f1 | 93 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
94 | return -ENOMEM; |
95 | } | |
96 | ax25_rt->digipeat->lastrepeat = -1; | |
97 | ax25_rt->digipeat->ndigi = route->digi_count; | |
98 | for (i = 0; i < route->digi_count; i++) { | |
99 | ax25_rt->digipeat->repeated[i] = 0; | |
100 | ax25_rt->digipeat->calls[i] = route->digi_addr[i]; | |
101 | } | |
102 | } | |
4de211f1 | 103 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
104 | return 0; |
105 | } | |
106 | ax25_rt = ax25_rt->next; | |
107 | } | |
108 | ||
109 | if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) { | |
4de211f1 | 110 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
111 | return -ENOMEM; |
112 | } | |
113 | ||
39f25d42 | 114 | refcount_set(&ax25_rt->refcount, 1); |
1da177e4 LT |
115 | ax25_rt->callsign = route->dest_addr; |
116 | ax25_rt->dev = ax25_dev->dev; | |
117 | ax25_rt->digipeat = NULL; | |
118 | ax25_rt->ip_mode = ' '; | |
119 | if (route->digi_count != 0) { | |
120 | if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { | |
4de211f1 | 121 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
122 | kfree(ax25_rt); |
123 | return -ENOMEM; | |
124 | } | |
125 | ax25_rt->digipeat->lastrepeat = -1; | |
126 | ax25_rt->digipeat->ndigi = route->digi_count; | |
127 | for (i = 0; i < route->digi_count; i++) { | |
128 | ax25_rt->digipeat->repeated[i] = 0; | |
129 | ax25_rt->digipeat->calls[i] = route->digi_addr[i]; | |
130 | } | |
131 | } | |
132 | ax25_rt->next = ax25_route_list; | |
133 | ax25_route_list = ax25_rt; | |
4de211f1 | 134 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
135 | |
136 | return 0; | |
137 | } | |
138 | ||
006f68b8 | 139 | void __ax25_put_route(ax25_route *ax25_rt) |
1da177e4 | 140 | { |
006f68b8 RBD |
141 | kfree(ax25_rt->digipeat); |
142 | kfree(ax25_rt); | |
1da177e4 LT |
143 | } |
144 | ||
145 | static int ax25_rt_del(struct ax25_routes_struct *route) | |
146 | { | |
147 | ax25_route *s, *t, *ax25_rt; | |
148 | ax25_dev *ax25_dev; | |
149 | ||
150 | if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) | |
151 | return -EINVAL; | |
152 | ||
4de211f1 | 153 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
154 | |
155 | ax25_rt = ax25_route_list; | |
156 | while (ax25_rt != NULL) { | |
157 | s = ax25_rt; | |
158 | ax25_rt = ax25_rt->next; | |
159 | if (s->dev == ax25_dev->dev && | |
160 | ax25cmp(&route->dest_addr, &s->callsign) == 0) { | |
161 | if (ax25_route_list == s) { | |
162 | ax25_route_list = s->next; | |
006f68b8 | 163 | ax25_put_route(s); |
1da177e4 LT |
164 | } else { |
165 | for (t = ax25_route_list; t != NULL; t = t->next) { | |
166 | if (t->next == s) { | |
167 | t->next = s->next; | |
006f68b8 | 168 | ax25_put_route(s); |
1da177e4 LT |
169 | break; |
170 | } | |
171 | } | |
172 | } | |
173 | } | |
174 | } | |
4de211f1 | 175 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
176 | |
177 | return 0; | |
178 | } | |
179 | ||
180 | static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option) | |
181 | { | |
182 | ax25_route *ax25_rt; | |
183 | ax25_dev *ax25_dev; | |
184 | int err = 0; | |
185 | ||
186 | if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL) | |
187 | return -EINVAL; | |
188 | ||
4de211f1 | 189 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
190 | |
191 | ax25_rt = ax25_route_list; | |
192 | while (ax25_rt != NULL) { | |
193 | if (ax25_rt->dev == ax25_dev->dev && | |
194 | ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) { | |
195 | switch (rt_option->cmd) { | |
196 | case AX25_SET_RT_IPMODE: | |
197 | switch (rt_option->arg) { | |
198 | case ' ': | |
199 | case 'D': | |
200 | case 'V': | |
201 | ax25_rt->ip_mode = rt_option->arg; | |
202 | break; | |
203 | default: | |
204 | err = -EINVAL; | |
205 | goto out; | |
206 | } | |
207 | break; | |
208 | default: | |
209 | err = -EINVAL; | |
210 | goto out; | |
211 | } | |
212 | } | |
213 | ax25_rt = ax25_rt->next; | |
214 | } | |
215 | ||
216 | out: | |
4de211f1 | 217 | write_unlock_bh(&ax25_route_lock); |
1da177e4 LT |
218 | return err; |
219 | } | |
220 | ||
221 | int ax25_rt_ioctl(unsigned int cmd, void __user *arg) | |
222 | { | |
223 | struct ax25_route_opt_struct rt_option; | |
224 | struct ax25_routes_struct route; | |
225 | ||
226 | switch (cmd) { | |
227 | case SIOCADDRT: | |
228 | if (copy_from_user(&route, arg, sizeof(route))) | |
229 | return -EFAULT; | |
230 | return ax25_rt_add(&route); | |
231 | ||
232 | case SIOCDELRT: | |
233 | if (copy_from_user(&route, arg, sizeof(route))) | |
234 | return -EFAULT; | |
235 | return ax25_rt_del(&route); | |
236 | ||
237 | case SIOCAX25OPTRT: | |
238 | if (copy_from_user(&rt_option, arg, sizeof(rt_option))) | |
239 | return -EFAULT; | |
240 | return ax25_rt_opt(&rt_option); | |
241 | ||
242 | default: | |
243 | return -EINVAL; | |
244 | } | |
245 | } | |
246 | ||
247 | #ifdef CONFIG_PROC_FS | |
248 | ||
249 | static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos) | |
f16f3026 | 250 | __acquires(ax25_route_lock) |
1da177e4 LT |
251 | { |
252 | struct ax25_route *ax25_rt; | |
253 | int i = 1; | |
528930b9 YH |
254 | |
255 | read_lock(&ax25_route_lock); | |
1da177e4 LT |
256 | if (*pos == 0) |
257 | return SEQ_START_TOKEN; | |
258 | ||
259 | for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { | |
260 | if (i == *pos) | |
261 | return ax25_rt; | |
262 | ++i; | |
263 | } | |
264 | ||
265 | return NULL; | |
266 | } | |
267 | ||
268 | static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
269 | { | |
270 | ++*pos; | |
528930b9 | 271 | return (v == SEQ_START_TOKEN) ? ax25_route_list : |
1da177e4 LT |
272 | ((struct ax25_route *) v)->next; |
273 | } | |
274 | ||
275 | static void ax25_rt_seq_stop(struct seq_file *seq, void *v) | |
f16f3026 | 276 | __releases(ax25_route_lock) |
1da177e4 LT |
277 | { |
278 | read_unlock(&ax25_route_lock); | |
279 | } | |
280 | ||
281 | static int ax25_rt_seq_show(struct seq_file *seq, void *v) | |
282 | { | |
f75268cd RB |
283 | char buf[11]; |
284 | ||
1da177e4 LT |
285 | if (v == SEQ_START_TOKEN) |
286 | seq_puts(seq, "callsign dev mode digipeaters\n"); | |
287 | else { | |
288 | struct ax25_route *ax25_rt = v; | |
289 | const char *callsign; | |
290 | int i; | |
291 | ||
292 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0) | |
293 | callsign = "default"; | |
294 | else | |
f75268cd | 295 | callsign = ax2asc(buf, &ax25_rt->callsign); |
1da177e4 LT |
296 | |
297 | seq_printf(seq, "%-9s %-4s", | |
298 | callsign, | |
299 | ax25_rt->dev ? ax25_rt->dev->name : "???"); | |
300 | ||
301 | switch (ax25_rt->ip_mode) { | |
302 | case 'V': | |
303 | seq_puts(seq, " vc"); | |
304 | break; | |
305 | case 'D': | |
306 | seq_puts(seq, " dg"); | |
307 | break; | |
308 | default: | |
309 | seq_puts(seq, " *"); | |
310 | break; | |
311 | } | |
312 | ||
313 | if (ax25_rt->digipeat != NULL) | |
314 | for (i = 0; i < ax25_rt->digipeat->ndigi; i++) | |
f75268cd RB |
315 | seq_printf(seq, " %s", |
316 | ax2asc(buf, &ax25_rt->digipeat->calls[i])); | |
1da177e4 LT |
317 | |
318 | seq_puts(seq, "\n"); | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
fddda2b7 | 323 | const struct seq_operations ax25_rt_seqops = { |
1da177e4 LT |
324 | .start = ax25_rt_seq_start, |
325 | .next = ax25_rt_seq_next, | |
326 | .stop = ax25_rt_seq_stop, | |
327 | .show = ax25_rt_seq_show, | |
328 | }; | |
1da177e4 LT |
329 | #endif |
330 | ||
331 | /* | |
332 | * Find AX.25 route | |
333 | * | |
3f072310 | 334 | * Only routes with a reference count of zero can be destroyed. |
63530aba | 335 | * Must be called with ax25_route_lock read locked. |
1da177e4 | 336 | */ |
006f68b8 | 337 | ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) |
1da177e4 LT |
338 | { |
339 | ax25_route *ax25_spe_rt = NULL; | |
340 | ax25_route *ax25_def_rt = NULL; | |
341 | ax25_route *ax25_rt; | |
342 | ||
1da177e4 LT |
343 | /* |
344 | * Bind to the physical interface we heard them on, or the default | |
345 | * route if none is found; | |
346 | */ | |
347 | for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { | |
348 | if (dev == NULL) { | |
349 | if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL) | |
350 | ax25_spe_rt = ax25_rt; | |
351 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL) | |
352 | ax25_def_rt = ax25_rt; | |
353 | } else { | |
354 | if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev) | |
355 | ax25_spe_rt = ax25_rt; | |
356 | if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev) | |
357 | ax25_def_rt = ax25_rt; | |
358 | } | |
359 | } | |
360 | ||
361 | ax25_rt = ax25_def_rt; | |
362 | if (ax25_spe_rt != NULL) | |
363 | ax25_rt = ax25_spe_rt; | |
364 | ||
1da177e4 LT |
365 | return ax25_rt; |
366 | } | |
367 | ||
368 | /* | |
369 | * Adjust path: If you specify a default route and want to connect | |
370 | * a target on the digipeater path but w/o having a special route | |
371 | * set before, the path has to be truncated from your target on. | |
372 | */ | |
373 | static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat) | |
374 | { | |
375 | int k; | |
376 | ||
377 | for (k = 0; k < digipeat->ndigi; k++) { | |
378 | if (ax25cmp(addr, &digipeat->calls[k]) == 0) | |
379 | break; | |
380 | } | |
381 | ||
382 | digipeat->ndigi = k; | |
383 | } | |
384 | ||
385 | ||
386 | /* | |
387 | * Find which interface to use. | |
388 | */ | |
389 | int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr) | |
390 | { | |
01d7dd0e | 391 | ax25_uid_assoc *user; |
1da177e4 | 392 | ax25_route *ax25_rt; |
b3d18f15 | 393 | int err = 0; |
1da177e4 | 394 | |
63530aba ED |
395 | ax25_route_lock_use(); |
396 | ax25_rt = ax25_get_route(addr, NULL); | |
397 | if (!ax25_rt) { | |
398 | ax25_route_lock_unuse(); | |
1da177e4 | 399 | return -EHOSTUNREACH; |
63530aba | 400 | } |
1da177e4 LT |
401 | if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) { |
402 | err = -EHOSTUNREACH; | |
403 | goto put; | |
404 | } | |
405 | ||
73400407 | 406 | user = ax25_findbyuid(current_euid()); |
01d7dd0e RB |
407 | if (user) { |
408 | ax25->source_addr = user->call; | |
409 | ax25_uid_put(user); | |
410 | } else { | |
1da177e4 LT |
411 | if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { |
412 | err = -EPERM; | |
413 | goto put; | |
414 | } | |
01d7dd0e | 415 | ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr; |
1da177e4 LT |
416 | } |
417 | ||
1da177e4 | 418 | if (ax25_rt->digipeat != NULL) { |
0459d70a ACM |
419 | ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi), |
420 | GFP_ATOMIC); | |
421 | if (ax25->digipeat == NULL) { | |
1da177e4 LT |
422 | err = -ENOMEM; |
423 | goto put; | |
424 | } | |
1da177e4 LT |
425 | ax25_adjust_path(addr, ax25->digipeat); |
426 | } | |
427 | ||
428 | if (ax25->sk != NULL) { | |
429 | bh_lock_sock(ax25->sk); | |
430 | sock_reset_flag(ax25->sk, SOCK_ZAPPED); | |
431 | bh_unlock_sock(ax25->sk); | |
432 | } | |
433 | ||
434 | put: | |
63530aba | 435 | ax25_route_lock_unuse(); |
b3d18f15 | 436 | return err; |
1da177e4 LT |
437 | } |
438 | ||
1da177e4 LT |
439 | struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src, |
440 | ax25_address *dest, ax25_digi *digi) | |
441 | { | |
442 | struct sk_buff *skbn; | |
443 | unsigned char *bp; | |
444 | int len; | |
445 | ||
446 | len = digi->ndigi * AX25_ADDR_LEN; | |
447 | ||
448 | if (skb_headroom(skb) < len) { | |
449 | if ((skbn = skb_realloc_headroom(skb, len)) == NULL) { | |
450 | printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n"); | |
451 | return NULL; | |
452 | } | |
453 | ||
454 | if (skb->sk != NULL) | |
455 | skb_set_owner_w(skbn, skb->sk); | |
456 | ||
5d0ba55b | 457 | consume_skb(skb); |
1da177e4 LT |
458 | |
459 | skb = skbn; | |
460 | } | |
461 | ||
462 | bp = skb_push(skb, len); | |
463 | ||
464 | ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS); | |
465 | ||
466 | return skb; | |
467 | } | |
468 | ||
469 | /* | |
470 | * Free all memory associated with routing structures. | |
471 | */ | |
472 | void __exit ax25_rt_free(void) | |
473 | { | |
474 | ax25_route *s, *ax25_rt = ax25_route_list; | |
475 | ||
4de211f1 | 476 | write_lock_bh(&ax25_route_lock); |
1da177e4 LT |
477 | while (ax25_rt != NULL) { |
478 | s = ax25_rt; | |
479 | ax25_rt = ax25_rt->next; | |
480 | ||
a51482bd | 481 | kfree(s->digipeat); |
1da177e4 LT |
482 | kfree(s); |
483 | } | |
4de211f1 | 484 | write_unlock_bh(&ax25_route_lock); |
1da177e4 | 485 | } |