ia64/linux-2.6.18-xen.hg

view net/ax25/ax25_route.c @ 673:3161879fdf22

[IA64] xencomm: support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap

support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Tue Sep 16 21:26:15 2008 +0900 (2008-09-16)
parents 831230e53067
children
line source
1 /*
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.
6 *
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)
13 */
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>
41 static ax25_route *ax25_route_list;
42 static DEFINE_RWLOCK(ax25_route_lock);
44 void ax25_rt_device_down(struct net_device *dev)
45 {
46 ax25_route *s, *t, *ax25_rt;
48 write_lock(&ax25_route_lock);
49 ax25_rt = ax25_route_list;
50 while (ax25_rt != NULL) {
51 s = ax25_rt;
52 ax25_rt = ax25_rt->next;
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(&ax25_route_lock);
72 }
74 static int ax25_rt_add(struct ax25_routes_struct *route)
75 {
76 ax25_route *ax25_rt;
77 ax25_dev *ax25_dev;
78 int i;
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;
85 write_lock(&ax25_route_lock);
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(&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(&ax25_route_lock);
106 return 0;
107 }
108 ax25_rt = ax25_rt->next;
109 }
111 if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
112 write_unlock(&ax25_route_lock);
113 return -ENOMEM;
114 }
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(&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(&ax25_route_lock);
138 return 0;
139 }
141 void __ax25_put_route(ax25_route *ax25_rt)
142 {
143 kfree(ax25_rt->digipeat);
144 kfree(ax25_rt);
145 }
147 static int ax25_rt_del(struct ax25_routes_struct *route)
148 {
149 ax25_route *s, *t, *ax25_rt;
150 ax25_dev *ax25_dev;
152 if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
153 return -EINVAL;
155 write_lock(&ax25_route_lock);
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(&ax25_route_lock);
179 return 0;
180 }
182 static 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;
188 if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
189 return -EINVAL;
191 write_lock(&ax25_route_lock);
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 }
218 out:
219 write_unlock(&ax25_route_lock);
220 return err;
221 }
223 int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
224 {
225 struct ax25_route_opt_struct rt_option;
226 struct ax25_routes_struct route;
228 switch (cmd) {
229 case SIOCADDRT:
230 if (copy_from_user(&route, arg, sizeof(route)))
231 return -EFAULT;
232 return ax25_rt_add(&route);
234 case SIOCDELRT:
235 if (copy_from_user(&route, arg, sizeof(route)))
236 return -EFAULT;
237 return ax25_rt_del(&route);
239 case SIOCAX25OPTRT:
240 if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
241 return -EFAULT;
242 return ax25_rt_opt(&rt_option);
244 default:
245 return -EINVAL;
246 }
247 }
249 #ifdef CONFIG_PROC_FS
251 static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
252 {
253 struct ax25_route *ax25_rt;
254 int i = 1;
256 read_lock(&ax25_route_lock);
257 if (*pos == 0)
258 return SEQ_START_TOKEN;
260 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
261 if (i == *pos)
262 return ax25_rt;
263 ++i;
264 }
266 return NULL;
267 }
269 static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
270 {
271 ++*pos;
272 return (v == SEQ_START_TOKEN) ? ax25_route_list :
273 ((struct ax25_route *) v)->next;
274 }
276 static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
277 {
278 read_unlock(&ax25_route_lock);
279 }
281 static int ax25_rt_seq_show(struct seq_file *seq, void *v)
282 {
283 char buf[11];
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;
292 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
293 callsign = "default";
294 else
295 callsign = ax2asc(buf, &ax25_rt->callsign);
297 seq_printf(seq, "%-9s %-4s",
298 callsign,
299 ax25_rt->dev ? ax25_rt->dev->name : "???");
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 }
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]));
318 seq_puts(seq, "\n");
319 }
320 return 0;
321 }
323 static 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 };
330 static int ax25_rt_info_open(struct inode *inode, struct file *file)
331 {
332 return seq_open(file, &ax25_rt_seqops);
333 }
335 struct file_operations ax25_route_fops = {
336 .owner = THIS_MODULE,
337 .open = ax25_rt_info_open,
338 .read = seq_read,
339 .llseek = seq_lseek,
340 .release = seq_release,
341 };
343 #endif
345 /*
346 * Find AX.25 route
347 *
348 * Only routes with a reference count of zero can be destroyed.
349 */
350 ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
351 {
352 ax25_route *ax25_spe_rt = NULL;
353 ax25_route *ax25_def_rt = NULL;
354 ax25_route *ax25_rt;
356 read_lock(&ax25_route_lock);
357 /*
358 * Bind to the physical interface we heard them on, or the default
359 * route if none is found;
360 */
361 for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
362 if (dev == NULL) {
363 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
364 ax25_spe_rt = ax25_rt;
365 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
366 ax25_def_rt = ax25_rt;
367 } else {
368 if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
369 ax25_spe_rt = ax25_rt;
370 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
371 ax25_def_rt = ax25_rt;
372 }
373 }
375 ax25_rt = ax25_def_rt;
376 if (ax25_spe_rt != NULL)
377 ax25_rt = ax25_spe_rt;
379 if (ax25_rt != NULL)
380 ax25_hold_route(ax25_rt);
382 read_unlock(&ax25_route_lock);
384 return ax25_rt;
385 }
387 /*
388 * Adjust path: If you specify a default route and want to connect
389 * a target on the digipeater path but w/o having a special route
390 * set before, the path has to be truncated from your target on.
391 */
392 static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
393 {
394 int k;
396 for (k = 0; k < digipeat->ndigi; k++) {
397 if (ax25cmp(addr, &digipeat->calls[k]) == 0)
398 break;
399 }
401 digipeat->ndigi = k;
402 }
405 /*
406 * Find which interface to use.
407 */
408 int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
409 {
410 ax25_uid_assoc *user;
411 ax25_route *ax25_rt;
412 int err;
414 if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
415 return -EHOSTUNREACH;
417 if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
418 err = -EHOSTUNREACH;
419 goto put;
420 }
422 user = ax25_findbyuid(current->euid);
423 if (user) {
424 ax25->source_addr = user->call;
425 ax25_uid_put(user);
426 } else {
427 if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
428 err = -EPERM;
429 goto put;
430 }
431 ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
432 }
434 if (ax25_rt->digipeat != NULL) {
435 if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
436 err = -ENOMEM;
437 goto put;
438 }
439 memcpy(ax25->digipeat, ax25_rt->digipeat, sizeof(ax25_digi));
440 ax25_adjust_path(addr, ax25->digipeat);
441 }
443 if (ax25->sk != NULL) {
444 bh_lock_sock(ax25->sk);
445 sock_reset_flag(ax25->sk, SOCK_ZAPPED);
446 bh_unlock_sock(ax25->sk);
447 }
449 put:
450 ax25_put_route(ax25_rt);
452 return 0;
453 }
455 struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
456 ax25_address *dest, ax25_digi *digi)
457 {
458 struct sk_buff *skbn;
459 unsigned char *bp;
460 int len;
462 len = digi->ndigi * AX25_ADDR_LEN;
464 if (skb_headroom(skb) < len) {
465 if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
466 printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
467 return NULL;
468 }
470 if (skb->sk != NULL)
471 skb_set_owner_w(skbn, skb->sk);
473 kfree_skb(skb);
475 skb = skbn;
476 }
478 bp = skb_push(skb, len);
480 ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
482 return skb;
483 }
485 /*
486 * Free all memory associated with routing structures.
487 */
488 void __exit ax25_rt_free(void)
489 {
490 ax25_route *s, *ax25_rt = ax25_route_list;
492 write_lock(&ax25_route_lock);
493 while (ax25_rt != NULL) {
494 s = ax25_rt;
495 ax25_rt = ax25_rt->next;
497 kfree(s->digipeat);
498 kfree(s);
499 }
500 write_unlock(&ax25_route_lock);
501 }