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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
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 */
11
12#include <linux/capability.h>
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>
23#include <linux/slab.h>
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>
31#include <linux/uaccess.h>
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>
37#include <linux/export.h>
38
39static ax25_route *ax25_route_list;
40DEFINE_RWLOCK(ax25_route_lock);
41
42void ax25_rt_device_down(struct net_device *dev)
43{
44 ax25_route *s, *t, *ax25_rt;
45
46 write_lock_bh(&ax25_route_lock);
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;
55 kfree(s->digipeat);
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;
61 kfree(s->digipeat);
62 kfree(s);
63 break;
64 }
65 }
66 }
67 }
68 }
69 write_unlock_bh(&ax25_route_lock);
70}
71
72static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
73{
74 ax25_route *ax25_rt;
75 ax25_dev *ax25_dev;
76 int i;
77
78 if (route->digi_count > AX25_MAX_DIGIS)
79 return -EINVAL;
80
81 ax25_dev = ax25_addr_ax25dev(&route->port_addr);
82 if (!ax25_dev)
83 return -EINVAL;
84
85 write_lock_bh(&ax25_route_lock);
86
87 ax25_rt = ax25_route_list;
88 while (ax25_rt != NULL) {
89 if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
90 ax25_rt->dev == ax25_dev->dev) {
91 kfree(ax25_rt->digipeat);
92 ax25_rt->digipeat = NULL;
93 if (route->digi_count != 0) {
94 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
95 write_unlock_bh(&ax25_route_lock);
96 ax25_dev_put(ax25_dev);
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 ax25_dev_put(ax25_dev);
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_bh(&ax25_route_lock);
115 ax25_dev_put(ax25_dev);
116 return -ENOMEM;
117 }
118
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_bh(&ax25_route_lock);
126 kfree(ax25_rt);
127 ax25_dev_put(ax25_dev);
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;
139 write_unlock_bh(&ax25_route_lock);
140 ax25_dev_put(ax25_dev);
141
142 return 0;
143}
144
145void __ax25_put_route(ax25_route *ax25_rt)
146{
147 kfree(ax25_rt->digipeat);
148 kfree(ax25_rt);
149}
150
151static 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
159 write_lock_bh(&ax25_route_lock);
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;
169 __ax25_put_route(s);
170 } else {
171 for (t = ax25_route_list; t != NULL; t = t->next) {
172 if (t->next == s) {
173 t->next = s->next;
174 __ax25_put_route(s);
175 break;
176 }
177 }
178 }
179 }
180 }
181 write_unlock_bh(&ax25_route_lock);
182 ax25_dev_put(ax25_dev);
183
184 return 0;
185}
186
187static 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
196 write_lock_bh(&ax25_route_lock);
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
223out:
224 write_unlock_bh(&ax25_route_lock);
225 ax25_dev_put(ax25_dev);
226 return err;
227}
228
229int 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
257static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
258 __acquires(ax25_route_lock)
259{
260 struct ax25_route *ax25_rt;
261 int i = 1;
262
263 read_lock(&ax25_route_lock);
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
276static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
277{
278 ++*pos;
279 return (v == SEQ_START_TOKEN) ? ax25_route_list :
280 ((struct ax25_route *) v)->next;
281}
282
283static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
284 __releases(ax25_route_lock)
285{
286 read_unlock(&ax25_route_lock);
287}
288
289static int ax25_rt_seq_show(struct seq_file *seq, void *v)
290{
291 char buf[11];
292
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
303 callsign = ax2asc(buf, &ax25_rt->callsign);
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++)
323 seq_printf(seq, " %s",
324 ax2asc(buf, &ax25_rt->digipeat->calls[i]));
325
326 seq_puts(seq, "\n");
327 }
328 return 0;
329}
330
331const struct seq_operations ax25_rt_seqops = {
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};
337#endif
338
339/*
340 * Find AX.25 route
341 *
342 * Only routes with a reference count of zero can be destroyed.
343 * Must be called with ax25_route_lock read locked.
344 */
345ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
346{
347 ax25_route *ax25_spe_rt = NULL;
348 ax25_route *ax25_def_rt = NULL;
349 ax25_route *ax25_rt;
350
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
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 */
381static 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 */
397int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
398{
399 ax25_uid_assoc *user;
400 ax25_route *ax25_rt;
401 int err = 0;
402
403 ax25_route_lock_use();
404 ax25_rt = ax25_get_route(addr, NULL);
405 if (!ax25_rt) {
406 ax25_route_lock_unuse();
407 return -EHOSTUNREACH;
408 }
409 if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
410 err = -EHOSTUNREACH;
411 goto put;
412 }
413
414 user = ax25_findbyuid(current_euid());
415 if (user) {
416 ax25->source_addr = user->call;
417 ax25_uid_put(user);
418 } else {
419 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
420 err = -EPERM;
421 goto put;
422 }
423 ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
424 }
425
426 if (ax25_rt->digipeat != NULL) {
427 ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
428 GFP_ATOMIC);
429 if (ax25->digipeat == NULL) {
430 err = -ENOMEM;
431 goto put;
432 }
433 ax25_adjust_path(addr, ax25->digipeat);
434 }
435
436 if (ax25->sk != NULL) {
437 local_bh_disable();
438 bh_lock_sock(ax25->sk);
439 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
440 bh_unlock_sock(ax25->sk);
441 local_bh_enable();
442 }
443
444put:
445 ax25_route_lock_unuse();
446 return err;
447}
448
449struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
450 ax25_address *dest, ax25_digi *digi)
451{
452 unsigned char *bp;
453 int len;
454
455 len = digi->ndigi * AX25_ADDR_LEN;
456
457 if (unlikely(skb_headroom(skb) < len)) {
458 skb = skb_expand_head(skb, len);
459 if (!skb) {
460 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
461 return NULL;
462 }
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 */
475void __exit ax25_rt_free(void)
476{
477 ax25_route *s, *ax25_rt = ax25_route_list;
478
479 write_lock_bh(&ax25_route_lock);
480 while (ax25_rt != NULL) {
481 s = ax25_rt;
482 ax25_rt = ax25_rt->next;
483
484 kfree(s->digipeat);
485 kfree(s);
486 }
487 write_unlock_bh(&ax25_route_lock);
488}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
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 */
11
12#include <linux/capability.h>
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>
23#include <linux/slab.h>
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>
31#include <linux/uaccess.h>
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>
37#include <linux/export.h>
38
39static ax25_route *ax25_route_list;
40DEFINE_RWLOCK(ax25_route_lock);
41
42void ax25_rt_device_down(struct net_device *dev)
43{
44 ax25_route *s, *t, *ax25_rt;
45
46 write_lock_bh(&ax25_route_lock);
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;
55 kfree(s->digipeat);
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;
61 kfree(s->digipeat);
62 kfree(s);
63 break;
64 }
65 }
66 }
67 }
68 }
69 write_unlock_bh(&ax25_route_lock);
70}
71
72static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
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
83 write_lock_bh(&ax25_route_lock);
84
85 ax25_rt = ax25_route_list;
86 while (ax25_rt != NULL) {
87 if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
88 ax25_rt->dev == ax25_dev->dev) {
89 kfree(ax25_rt->digipeat);
90 ax25_rt->digipeat = NULL;
91 if (route->digi_count != 0) {
92 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
93 write_unlock_bh(&ax25_route_lock);
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 }
103 write_unlock_bh(&ax25_route_lock);
104 return 0;
105 }
106 ax25_rt = ax25_rt->next;
107 }
108
109 if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
110 write_unlock_bh(&ax25_route_lock);
111 return -ENOMEM;
112 }
113
114 refcount_set(&ax25_rt->refcount, 1);
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) {
121 write_unlock_bh(&ax25_route_lock);
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;
134 write_unlock_bh(&ax25_route_lock);
135
136 return 0;
137}
138
139void __ax25_put_route(ax25_route *ax25_rt)
140{
141 kfree(ax25_rt->digipeat);
142 kfree(ax25_rt);
143}
144
145static 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
153 write_lock_bh(&ax25_route_lock);
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;
163 ax25_put_route(s);
164 } else {
165 for (t = ax25_route_list; t != NULL; t = t->next) {
166 if (t->next == s) {
167 t->next = s->next;
168 ax25_put_route(s);
169 break;
170 }
171 }
172 }
173 }
174 }
175 write_unlock_bh(&ax25_route_lock);
176
177 return 0;
178}
179
180static 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
189 write_lock_bh(&ax25_route_lock);
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
216out:
217 write_unlock_bh(&ax25_route_lock);
218 return err;
219}
220
221int 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
249static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
250 __acquires(ax25_route_lock)
251{
252 struct ax25_route *ax25_rt;
253 int i = 1;
254
255 read_lock(&ax25_route_lock);
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
268static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
269{
270 ++*pos;
271 return (v == SEQ_START_TOKEN) ? ax25_route_list :
272 ((struct ax25_route *) v)->next;
273}
274
275static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
276 __releases(ax25_route_lock)
277{
278 read_unlock(&ax25_route_lock);
279}
280
281static int ax25_rt_seq_show(struct seq_file *seq, void *v)
282{
283 char buf[11];
284
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
295 callsign = ax2asc(buf, &ax25_rt->callsign);
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++)
315 seq_printf(seq, " %s",
316 ax2asc(buf, &ax25_rt->digipeat->calls[i]));
317
318 seq_puts(seq, "\n");
319 }
320 return 0;
321}
322
323const struct seq_operations ax25_rt_seqops = {
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};
329#endif
330
331/*
332 * Find AX.25 route
333 *
334 * Only routes with a reference count of zero can be destroyed.
335 * Must be called with ax25_route_lock read locked.
336 */
337ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
338{
339 ax25_route *ax25_spe_rt = NULL;
340 ax25_route *ax25_def_rt = NULL;
341 ax25_route *ax25_rt;
342
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
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 */
373static 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 */
389int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
390{
391 ax25_uid_assoc *user;
392 ax25_route *ax25_rt;
393 int err = 0;
394
395 ax25_route_lock_use();
396 ax25_rt = ax25_get_route(addr, NULL);
397 if (!ax25_rt) {
398 ax25_route_lock_unuse();
399 return -EHOSTUNREACH;
400 }
401 if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
402 err = -EHOSTUNREACH;
403 goto put;
404 }
405
406 user = ax25_findbyuid(current_euid());
407 if (user) {
408 ax25->source_addr = user->call;
409 ax25_uid_put(user);
410 } else {
411 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
412 err = -EPERM;
413 goto put;
414 }
415 ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
416 }
417
418 if (ax25_rt->digipeat != NULL) {
419 ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
420 GFP_ATOMIC);
421 if (ax25->digipeat == NULL) {
422 err = -ENOMEM;
423 goto put;
424 }
425 ax25_adjust_path(addr, ax25->digipeat);
426 }
427
428 if (ax25->sk != NULL) {
429 local_bh_disable();
430 bh_lock_sock(ax25->sk);
431 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
432 bh_unlock_sock(ax25->sk);
433 local_bh_enable();
434 }
435
436put:
437 ax25_route_lock_unuse();
438 return err;
439}
440
441struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
442 ax25_address *dest, ax25_digi *digi)
443{
444 struct sk_buff *skbn;
445 unsigned char *bp;
446 int len;
447
448 len = digi->ndigi * AX25_ADDR_LEN;
449
450 if (skb_headroom(skb) < len) {
451 if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
452 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
453 return NULL;
454 }
455
456 if (skb->sk != NULL)
457 skb_set_owner_w(skbn, skb->sk);
458
459 consume_skb(skb);
460
461 skb = skbn;
462 }
463
464 bp = skb_push(skb, len);
465
466 ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
467
468 return skb;
469}
470
471/*
472 * Free all memory associated with routing structures.
473 */
474void __exit ax25_rt_free(void)
475{
476 ax25_route *s, *ax25_rt = ax25_route_list;
477
478 write_lock_bh(&ax25_route_lock);
479 while (ax25_rt != NULL) {
480 s = ax25_rt;
481 ax25_rt = ax25_rt->next;
482
483 kfree(s->digipeat);
484 kfree(s);
485 }
486 write_unlock_bh(&ax25_route_lock);
487}