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.
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)
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>
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>
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>
34 #include <linux/uaccess.h>
35 #include <linux/fcntl.h>
37 #include <linux/interrupt.h>
38 #include <linux/init.h>
39 #include <linux/seq_file.h>
40 #include <linux/export.h>
42 static ax25_route *ax25_route_list;
43 DEFINE_RWLOCK(ax25_route_lock);
45 void ax25_rt_device_down(struct net_device *dev)
47 ax25_route *s, *t, *ax25_rt;
49 write_lock_bh(&ax25_route_lock);
50 ax25_rt = ax25_route_list;
51 while (ax25_rt != NULL) {
53 ax25_rt = ax25_rt->next;
56 if (ax25_route_list == s) {
57 ax25_route_list = s->next;
61 for (t = ax25_route_list; t != NULL; t = t->next) {
72 write_unlock_bh(&ax25_route_lock);
75 static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
81 if (route->digi_count > AX25_MAX_DIGIS)
84 ax25_dev = ax25_addr_ax25dev(&route->port_addr);
88 write_lock_bh(&ax25_route_lock);
90 ax25_rt = ax25_route_list;
91 while (ax25_rt != NULL) {
92 if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
93 ax25_rt->dev == ax25_dev->dev) {
94 kfree(ax25_rt->digipeat);
95 ax25_rt->digipeat = NULL;
96 if (route->digi_count != 0) {
97 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
98 write_unlock_bh(&ax25_route_lock);
99 ax25_dev_put(ax25_dev);
102 ax25_rt->digipeat->lastrepeat = -1;
103 ax25_rt->digipeat->ndigi = route->digi_count;
104 for (i = 0; i < route->digi_count; i++) {
105 ax25_rt->digipeat->repeated[i] = 0;
106 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
109 write_unlock_bh(&ax25_route_lock);
110 ax25_dev_put(ax25_dev);
113 ax25_rt = ax25_rt->next;
116 if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
117 write_unlock_bh(&ax25_route_lock);
118 ax25_dev_put(ax25_dev);
122 refcount_set(&ax25_rt->refcount, 1);
123 ax25_rt->callsign = route->dest_addr;
124 ax25_rt->dev = ax25_dev->dev;
125 ax25_rt->digipeat = NULL;
126 ax25_rt->ip_mode = ' ';
127 if (route->digi_count != 0) {
128 if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
129 write_unlock_bh(&ax25_route_lock);
131 ax25_dev_put(ax25_dev);
134 ax25_rt->digipeat->lastrepeat = -1;
135 ax25_rt->digipeat->ndigi = route->digi_count;
136 for (i = 0; i < route->digi_count; i++) {
137 ax25_rt->digipeat->repeated[i] = 0;
138 ax25_rt->digipeat->calls[i] = route->digi_addr[i];
141 ax25_rt->next = ax25_route_list;
142 ax25_route_list = ax25_rt;
143 write_unlock_bh(&ax25_route_lock);
144 ax25_dev_put(ax25_dev);
149 void __ax25_put_route(ax25_route *ax25_rt)
151 kfree(ax25_rt->digipeat);
155 static int ax25_rt_del(struct ax25_routes_struct *route)
157 ax25_route *s, *t, *ax25_rt;
160 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
163 write_lock_bh(&ax25_route_lock);
165 ax25_rt = ax25_route_list;
166 while (ax25_rt != NULL) {
168 ax25_rt = ax25_rt->next;
169 if (s->dev == ax25_dev->dev &&
170 ax25cmp(&route->dest_addr, &s->callsign) == 0) {
171 if (ax25_route_list == s) {
172 ax25_route_list = s->next;
175 for (t = ax25_route_list; t != NULL; t = t->next) {
185 write_unlock_bh(&ax25_route_lock);
186 ax25_dev_put(ax25_dev);
191 static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
197 if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
200 write_lock_bh(&ax25_route_lock);
202 ax25_rt = ax25_route_list;
203 while (ax25_rt != NULL) {
204 if (ax25_rt->dev == ax25_dev->dev &&
205 ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
206 switch (rt_option->cmd) {
207 case AX25_SET_RT_IPMODE:
208 switch (rt_option->arg) {
212 ax25_rt->ip_mode = rt_option->arg;
224 ax25_rt = ax25_rt->next;
228 write_unlock_bh(&ax25_route_lock);
229 ax25_dev_put(ax25_dev);
233 int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
235 struct ax25_route_opt_struct rt_option;
236 struct ax25_routes_struct route;
240 if (copy_from_user(&route, arg, sizeof(route)))
242 return ax25_rt_add(&route);
245 if (copy_from_user(&route, arg, sizeof(route)))
247 return ax25_rt_del(&route);
250 if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
252 return ax25_rt_opt(&rt_option);
259 #ifdef CONFIG_PROC_FS
261 static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
262 __acquires(ax25_route_lock)
264 struct ax25_route *ax25_rt;
267 read_lock(&ax25_route_lock);
269 return SEQ_START_TOKEN;
271 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
280 static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
283 return (v == SEQ_START_TOKEN) ? ax25_route_list :
284 ((struct ax25_route *) v)->next;
287 static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
288 __releases(ax25_route_lock)
290 read_unlock(&ax25_route_lock);
293 static int ax25_rt_seq_show(struct seq_file *seq, void *v)
297 if (v == SEQ_START_TOKEN)
298 seq_puts(seq, "callsign dev mode digipeaters\n");
300 struct ax25_route *ax25_rt = v;
301 const char *callsign;
304 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
305 callsign = "default";
307 callsign = ax2asc(buf, &ax25_rt->callsign);
309 seq_printf(seq, "%-9s %-4s",
311 ax25_rt->dev ? ax25_rt->dev->name : "???");
313 switch (ax25_rt->ip_mode) {
315 seq_puts(seq, " vc");
318 seq_puts(seq, " dg");
325 if (ax25_rt->digipeat != NULL)
326 for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
327 seq_printf(seq, " %s",
328 ax2asc(buf, &ax25_rt->digipeat->calls[i]));
335 static const struct seq_operations ax25_rt_seqops = {
336 .start = ax25_rt_seq_start,
337 .next = ax25_rt_seq_next,
338 .stop = ax25_rt_seq_stop,
339 .show = ax25_rt_seq_show,
342 static int ax25_rt_info_open(struct inode *inode, struct file *file)
344 return seq_open(file, &ax25_rt_seqops);
347 const struct file_operations ax25_route_fops = {
348 .owner = THIS_MODULE,
349 .open = ax25_rt_info_open,
352 .release = seq_release,
360 * Only routes with a reference count of zero can be destroyed.
361 * Must be called with ax25_route_lock read locked.
363 ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
365 ax25_route *ax25_spe_rt = NULL;
366 ax25_route *ax25_def_rt = NULL;
370 * Bind to the physical interface we heard them on, or the default
371 * route if none is found;
373 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
375 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
376 ax25_spe_rt = ax25_rt;
377 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
378 ax25_def_rt = ax25_rt;
380 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
381 ax25_spe_rt = ax25_rt;
382 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
383 ax25_def_rt = ax25_rt;
387 ax25_rt = ax25_def_rt;
388 if (ax25_spe_rt != NULL)
389 ax25_rt = ax25_spe_rt;
395 * Adjust path: If you specify a default route and want to connect
396 * a target on the digipeater path but w/o having a special route
397 * set before, the path has to be truncated from your target on.
399 static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
403 for (k = 0; k < digipeat->ndigi; k++) {
404 if (ax25cmp(addr, &digipeat->calls[k]) == 0)
413 * Find which interface to use.
415 int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
417 ax25_uid_assoc *user;
421 ax25_route_lock_use();
422 ax25_rt = ax25_get_route(addr, NULL);
424 ax25_route_lock_unuse();
425 return -EHOSTUNREACH;
427 if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
432 user = ax25_findbyuid(current_euid());
434 ax25->source_addr = user->call;
437 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
441 ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
444 if (ax25_rt->digipeat != NULL) {
445 ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
447 if (ax25->digipeat == NULL) {
451 ax25_adjust_path(addr, ax25->digipeat);
454 if (ax25->sk != NULL) {
456 bh_lock_sock(ax25->sk);
457 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
458 bh_unlock_sock(ax25->sk);
463 ax25_route_lock_unuse();
467 struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
468 ax25_address *dest, ax25_digi *digi)
470 struct sk_buff *skbn;
474 len = digi->ndigi * AX25_ADDR_LEN;
476 if (skb_headroom(skb) < len) {
477 if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
478 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
483 skb_set_owner_w(skbn, skb->sk);
490 bp = skb_push(skb, len);
492 ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
498 * Free all memory associated with routing structures.
500 void __exit ax25_rt_free(void)
502 ax25_route *s, *ax25_rt = ax25_route_list;
504 write_lock_bh(&ax25_route_lock);
505 while (ax25_rt != NULL) {
507 ax25_rt = ax25_rt->next;
512 write_unlock_bh(&ax25_route_lock);