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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 <net/ax25.h>
27#include <linux/inet.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/skbuff.h>
31#include <linux/spinlock.h>
32#include <net/sock.h>
33#include <asm/uaccess.h>
34#include <asm/system.h>
35#include <linux/fcntl.h>
36#include <linux/mm.h>
37#include <linux/interrupt.h>
38#include <linux/init.h>
39#include <linux/seq_file.h>
40
41static ax25_route *ax25_route_list;
42static DEFINE_RWLOCK(ax25_route_lock);
43
44void ax25_rt_device_down(struct net_device *dev)
45{
46 ax25_route *s, *t, *ax25_rt;
47
48 write_lock_bh(&ax25_route_lock);
49 ax25_rt = ax25_route_list;
50 while (ax25_rt != NULL) {
51 s = ax25_rt;
52 ax25_rt = ax25_rt->next;
53
54 if (s->dev == dev) {
55 if (ax25_route_list == s) {
56 ax25_route_list = s->next;
57 kfree(s->digipeat);
58 kfree(s);
59 } else {
60 for (t = ax25_route_list; t != NULL; t = t->next) {
61 if (t->next == s) {
62 t->next = s->next;
63 kfree(s->digipeat);
64 kfree(s);
65 break;
66 }
67 }
68 }
69 }
70 }
71 write_unlock_bh(&ax25_route_lock);
72}
73
74static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
75{
76 ax25_route *ax25_rt;
77 ax25_dev *ax25_dev;
78 int i;
79
80 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
81 return -EINVAL;
82 if (route->digi_count > AX25_MAX_DIGIS)
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 return -ENOMEM;
97 }
98 ax25_rt->digipeat->lastrepeat = -1;
99 ax25_rt->digipeat->ndigi = route->digi_count;
100 for (i = 0; i < route->digi_count; i++) {
101 ax25_rt->digipeat->repeated[i] = 0;
102 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
103 }
104 }
105 write_unlock_bh(&ax25_route_lock);
106 return 0;
107 }
108 ax25_rt = ax25_rt->next;
109 }
110
111 if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
112 write_unlock_bh(&ax25_route_lock);
113 return -ENOMEM;
114 }
115
116 atomic_set(&ax25_rt->refcount, 1);
117 ax25_rt->callsign = route->dest_addr;
118 ax25_rt->dev = ax25_dev->dev;
119 ax25_rt->digipeat = NULL;
120 ax25_rt->ip_mode = ' ';
121 if (route->digi_count != 0) {
122 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
123 write_unlock_bh(&ax25_route_lock);
124 kfree(ax25_rt);
125 return -ENOMEM;
126 }
127 ax25_rt->digipeat->lastrepeat = -1;
128 ax25_rt->digipeat->ndigi = route->digi_count;
129 for (i = 0; i < route->digi_count; i++) {
130 ax25_rt->digipeat->repeated[i] = 0;
131 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
132 }
133 }
134 ax25_rt->next = ax25_route_list;
135 ax25_route_list = ax25_rt;
136 write_unlock_bh(&ax25_route_lock);
137
138 return 0;
139}
140
141void __ax25_put_route(ax25_route *ax25_rt)
142{
143 kfree(ax25_rt->digipeat);
144 kfree(ax25_rt);
145}
146
147static int ax25_rt_del(struct ax25_routes_struct *route)
148{
149 ax25_route *s, *t, *ax25_rt;
150 ax25_dev *ax25_dev;
151
152 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
153 return -EINVAL;
154
155 write_lock_bh(&ax25_route_lock);
156
157 ax25_rt = ax25_route_list;
158 while (ax25_rt != NULL) {
159 s = ax25_rt;
160 ax25_rt = ax25_rt->next;
161 if (s->dev == ax25_dev->dev &&
162 ax25cmp(&route->dest_addr, &s->callsign) == 0) {
163 if (ax25_route_list == s) {
164 ax25_route_list = s->next;
165 ax25_put_route(s);
166 } else {
167 for (t = ax25_route_list; t != NULL; t = t->next) {
168 if (t->next == s) {
169 t->next = s->next;
170 ax25_put_route(s);
171 break;
172 }
173 }
174 }
175 }
176 }
177 write_unlock_bh(&ax25_route_lock);
178
179 return 0;
180}
181
182static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
183{
184 ax25_route *ax25_rt;
185 ax25_dev *ax25_dev;
186 int err = 0;
187
188 if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
189 return -EINVAL;
190
191 write_lock_bh(&ax25_route_lock);
192
193 ax25_rt = ax25_route_list;
194 while (ax25_rt != NULL) {
195 if (ax25_rt->dev == ax25_dev->dev &&
196 ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
197 switch (rt_option->cmd) {
198 case AX25_SET_RT_IPMODE:
199 switch (rt_option->arg) {
200 case ' ':
201 case 'D':
202 case 'V':
203 ax25_rt->ip_mode = rt_option->arg;
204 break;
205 default:
206 err = -EINVAL;
207 goto out;
208 }
209 break;
210 default:
211 err = -EINVAL;
212 goto out;
213 }
214 }
215 ax25_rt = ax25_rt->next;
216 }
217
218out:
219 write_unlock_bh(&ax25_route_lock);
220 return err;
221}
222
223int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
224{
225 struct ax25_route_opt_struct rt_option;
226 struct ax25_routes_struct route;
227
228 switch (cmd) {
229 case SIOCADDRT:
230 if (copy_from_user(&route, arg, sizeof(route)))
231 return -EFAULT;
232 return ax25_rt_add(&route);
233
234 case SIOCDELRT:
235 if (copy_from_user(&route, arg, sizeof(route)))
236 return -EFAULT;
237 return ax25_rt_del(&route);
238
239 case SIOCAX25OPTRT:
240 if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
241 return -EFAULT;
242 return ax25_rt_opt(&rt_option);
243
244 default:
245 return -EINVAL;
246 }
247}
248
249#ifdef CONFIG_PROC_FS
250
251static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
252 __acquires(ax25_route_lock)
253{
254 struct ax25_route *ax25_rt;
255 int i = 1;
256
257 read_lock(&ax25_route_lock);
258 if (*pos == 0)
259 return SEQ_START_TOKEN;
260
261 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
262 if (i == *pos)
263 return ax25_rt;
264 ++i;
265 }
266
267 return NULL;
268}
269
270static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
271{
272 ++*pos;
273 return (v == SEQ_START_TOKEN) ? ax25_route_list :
274 ((struct ax25_route *) v)->next;
275}
276
277static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
278 __releases(ax25_route_lock)
279{
280 read_unlock(&ax25_route_lock);
281}
282
283static int ax25_rt_seq_show(struct seq_file *seq, void *v)
284{
285 char buf[11];
286
287 if (v == SEQ_START_TOKEN)
288 seq_puts(seq, "callsign dev mode digipeaters\n");
289 else {
290 struct ax25_route *ax25_rt = v;
291 const char *callsign;
292 int i;
293
294 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
295 callsign = "default";
296 else
297 callsign = ax2asc(buf, &ax25_rt->callsign);
298
299 seq_printf(seq, "%-9s %-4s",
300 callsign,
301 ax25_rt->dev ? ax25_rt->dev->name : "???");
302
303 switch (ax25_rt->ip_mode) {
304 case 'V':
305 seq_puts(seq, " vc");
306 break;
307 case 'D':
308 seq_puts(seq, " dg");
309 break;
310 default:
311 seq_puts(seq, " *");
312 break;
313 }
314
315 if (ax25_rt->digipeat != NULL)
316 for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
317 seq_printf(seq, " %s",
318 ax2asc(buf, &ax25_rt->digipeat->calls[i]));
319
320 seq_puts(seq, "\n");
321 }
322 return 0;
323}
324
325static const struct seq_operations ax25_rt_seqops = {
326 .start = ax25_rt_seq_start,
327 .next = ax25_rt_seq_next,
328 .stop = ax25_rt_seq_stop,
329 .show = ax25_rt_seq_show,
330};
331
332static int ax25_rt_info_open(struct inode *inode, struct file *file)
333{
334 return seq_open(file, &ax25_rt_seqops);
335}
336
337const struct file_operations ax25_route_fops = {
338 .owner = THIS_MODULE,
339 .open = ax25_rt_info_open,
340 .read = seq_read,
341 .llseek = seq_lseek,
342 .release = seq_release,
343};
344
345#endif
346
347
348
349
350
351
352ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
353{
354 ax25_route *ax25_spe_rt = NULL;
355 ax25_route *ax25_def_rt = NULL;
356 ax25_route *ax25_rt;
357
358 read_lock(&ax25_route_lock);
359
360
361
362
363 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
364 if (dev == NULL) {
365 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
366 ax25_spe_rt = ax25_rt;
367 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
368 ax25_def_rt = ax25_rt;
369 } else {
370 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
371 ax25_spe_rt = ax25_rt;
372 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
373 ax25_def_rt = ax25_rt;
374 }
375 }
376
377 ax25_rt = ax25_def_rt;
378 if (ax25_spe_rt != NULL)
379 ax25_rt = ax25_spe_rt;
380
381 if (ax25_rt != NULL)
382 ax25_hold_route(ax25_rt);
383
384 read_unlock(&ax25_route_lock);
385
386 return ax25_rt;
387}
388
389
390
391
392
393
394static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
395{
396 int k;
397
398 for (k = 0; k < digipeat->ndigi; k++) {
399 if (ax25cmp(addr, &digipeat->calls[k]) == 0)
400 break;
401 }
402
403 digipeat->ndigi = k;
404}
405
406
407
408
409
410int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
411{
412 ax25_uid_assoc *user;
413 ax25_route *ax25_rt;
414 int err;
415
416 if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
417 return -EHOSTUNREACH;
418
419 if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
420 err = -EHOSTUNREACH;
421 goto put;
422 }
423
424 user = ax25_findbyuid(current_euid());
425 if (user) {
426 ax25->source_addr = user->call;
427 ax25_uid_put(user);
428 } else {
429 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
430 err = -EPERM;
431 goto put;
432 }
433 ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
434 }
435
436 if (ax25_rt->digipeat != NULL) {
437 ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
438 GFP_ATOMIC);
439 if (ax25->digipeat == NULL) {
440 err = -ENOMEM;
441 goto put;
442 }
443 ax25_adjust_path(addr, ax25->digipeat);
444 }
445
446 if (ax25->sk != NULL) {
447 bh_lock_sock(ax25->sk);
448 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
449 bh_unlock_sock(ax25->sk);
450 }
451
452put:
453 ax25_put_route(ax25_rt);
454
455 return 0;
456}
457
458struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
459 ax25_address *dest, ax25_digi *digi)
460{
461 struct sk_buff *skbn;
462 unsigned char *bp;
463 int len;
464
465 len = digi->ndigi * AX25_ADDR_LEN;
466
467 if (skb_headroom(skb) < len) {
468 if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
469 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
470 return NULL;
471 }
472
473 if (skb->sk != NULL)
474 skb_set_owner_w(skbn, skb->sk);
475
476 kfree_skb(skb);
477
478 skb = skbn;
479 }
480
481 bp = skb_push(skb, len);
482
483 ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
484
485 return skb;
486}
487
488
489
490
491void __exit ax25_rt_free(void)
492{
493 ax25_route *s, *ax25_rt = ax25_route_list;
494
495 write_lock_bh(&ax25_route_lock);
496 while (ax25_rt != NULL) {
497 s = ax25_rt;
498 ax25_rt = ax25_rt->next;
499
500 kfree(s->digipeat);
501 kfree(s);
502 }
503 write_unlock_bh(&ax25_route_lock);
504}
505
