blob: 4e4119a1213925568b8a1acdef9bf52b98b19da3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Ioctl handler
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 *
8 * $Id: br_ioctl.c,v 1.4 2000/11/08 05:16:40 davem Exp $
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
Randy Dunlap4fc268d2006-01-11 12:17:47 -080016#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/kernel.h>
18#include <linux/if_bridge.h>
19#include <linux/netdevice.h>
20#include <linux/times.h>
21#include <asm/uaccess.h>
22#include "br_private.h"
23
24/* called with RTNL */
25static int get_bridge_ifindices(int *indices, int num)
26{
27 struct net_device *dev;
28 int i = 0;
29
30 for (dev = dev_base; dev && i < num; dev = dev->next) {
31 if (dev->priv_flags & IFF_EBRIDGE)
32 indices[i++] = dev->ifindex;
33 }
34
35 return i;
36}
37
38/* called with RTNL */
39static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
40{
41 struct net_bridge_port *p;
42
43 list_for_each_entry(p, &br->port_list, list) {
44 if (p->port_no < num)
45 ifindices[p->port_no] = p->dev->ifindex;
46 }
47}
48
49/*
50 * Format up to a page worth of forwarding table entries
51 * userbuf -- where to copy result
52 * maxnum -- maximum number of entries desired
53 * (limited to a page for sanity)
54 * offset -- number of records to skip
55 */
56static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
57 unsigned long maxnum, unsigned long offset)
58{
59 int num;
60 void *buf;
61 size_t size = maxnum * sizeof(struct __fdb_entry);
62
63 if (size > PAGE_SIZE) {
64 size = PAGE_SIZE;
65 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
66 }
67
68 buf = kmalloc(size, GFP_USER);
69 if (!buf)
70 return -ENOMEM;
71
72 num = br_fdb_fillbuf(br, buf, maxnum, offset);
73 if (num > 0) {
74 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
75 num = -EFAULT;
76 }
77 kfree(buf);
78
79 return num;
80}
81
82static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
83{
84 struct net_device *dev;
85 int ret;
86
87 if (!capable(CAP_NET_ADMIN))
88 return -EPERM;
89
90 dev = dev_get_by_index(ifindex);
91 if (dev == NULL)
92 return -EINVAL;
93
94 if (isadd)
95 ret = br_add_if(br, dev);
96 else
97 ret = br_del_if(br, dev);
98
99 dev_put(dev);
100 return ret;
101}
102
103/*
104 * Legacy ioctl's through SIOCDEVPRIVATE
105 * This interface is deprecated because it was too difficult to
106 * to do the translation for 32/64bit ioctl compatability.
107 */
108static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
109{
110 struct net_bridge *br = netdev_priv(dev);
111 unsigned long args[4];
112
113 if (copy_from_user(args, rq->ifr_data, sizeof(args)))
114 return -EFAULT;
115
116 switch (args[0]) {
117 case BRCTL_ADD_IF:
118 case BRCTL_DEL_IF:
119 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
120
121 case BRCTL_GET_BRIDGE_INFO:
122 {
123 struct __bridge_info b;
124
125 memset(&b, 0, sizeof(struct __bridge_info));
126 rcu_read_lock();
127 memcpy(&b.designated_root, &br->designated_root, 8);
128 memcpy(&b.bridge_id, &br->bridge_id, 8);
129 b.root_path_cost = br->root_path_cost;
130 b.max_age = jiffies_to_clock_t(br->max_age);
131 b.hello_time = jiffies_to_clock_t(br->hello_time);
132 b.forward_delay = br->forward_delay;
133 b.bridge_max_age = br->bridge_max_age;
134 b.bridge_hello_time = br->bridge_hello_time;
135 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
136 b.topology_change = br->topology_change;
137 b.topology_change_detected = br->topology_change_detected;
138 b.root_port = br->root_port;
139 b.stp_enabled = br->stp_enabled;
140 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
141 b.hello_timer_value = br_timer_value(&br->hello_timer);
142 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
143 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
144 b.gc_timer_value = br_timer_value(&br->gc_timer);
145 rcu_read_unlock();
146
147 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
148 return -EFAULT;
149
150 return 0;
151 }
152
153 case BRCTL_GET_PORT_LIST:
154 {
155 int num, *indices;
156
157 num = args[2];
158 if (num < 0)
159 return -EINVAL;
160 if (num == 0)
161 num = 256;
162 if (num > BR_MAX_PORTS)
163 num = BR_MAX_PORTS;
164
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700165 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 if (indices == NULL)
167 return -ENOMEM;
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 get_port_ifindices(br, indices, num);
170 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
171 num = -EFAULT;
172 kfree(indices);
173 return num;
174 }
175
176 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
177 if (!capable(CAP_NET_ADMIN))
178 return -EPERM;
179
180 spin_lock_bh(&br->lock);
181 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
182 if (br_is_root_bridge(br))
183 br->forward_delay = br->bridge_forward_delay;
184 spin_unlock_bh(&br->lock);
185 return 0;
186
187 case BRCTL_SET_BRIDGE_HELLO_TIME:
188 if (!capable(CAP_NET_ADMIN))
189 return -EPERM;
190
191 spin_lock_bh(&br->lock);
192 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
193 if (br_is_root_bridge(br))
194 br->hello_time = br->bridge_hello_time;
195 spin_unlock_bh(&br->lock);
196 return 0;
197
198 case BRCTL_SET_BRIDGE_MAX_AGE:
199 if (!capable(CAP_NET_ADMIN))
200 return -EPERM;
201
202 spin_lock_bh(&br->lock);
203 br->bridge_max_age = clock_t_to_jiffies(args[1]);
204 if (br_is_root_bridge(br))
205 br->max_age = br->bridge_max_age;
206 spin_unlock_bh(&br->lock);
207 return 0;
208
209 case BRCTL_SET_AGEING_TIME:
210 if (!capable(CAP_NET_ADMIN))
211 return -EPERM;
212
213 br->ageing_time = clock_t_to_jiffies(args[1]);
214 return 0;
215
216 case BRCTL_GET_PORT_INFO:
217 {
218 struct __port_info p;
219 struct net_bridge_port *pt;
220
221 rcu_read_lock();
222 if ((pt = br_get_port(br, args[2])) == NULL) {
223 rcu_read_unlock();
224 return -EINVAL;
225 }
226
227 memset(&p, 0, sizeof(struct __port_info));
228 memcpy(&p.designated_root, &pt->designated_root, 8);
229 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
230 p.port_id = pt->port_id;
231 p.designated_port = pt->designated_port;
232 p.path_cost = pt->path_cost;
233 p.designated_cost = pt->designated_cost;
234 p.state = pt->state;
235 p.top_change_ack = pt->topology_change_ack;
236 p.config_pending = pt->config_pending;
237 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
238 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
239 p.hold_timer_value = br_timer_value(&pt->hold_timer);
240
241 rcu_read_unlock();
242
243 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
244 return -EFAULT;
245
246 return 0;
247 }
248
249 case BRCTL_SET_BRIDGE_STP_STATE:
250 if (!capable(CAP_NET_ADMIN))
251 return -EPERM;
252
253 br->stp_enabled = args[1]?1:0;
254 return 0;
255
256 case BRCTL_SET_BRIDGE_PRIORITY:
257 if (!capable(CAP_NET_ADMIN))
258 return -EPERM;
259
260 spin_lock_bh(&br->lock);
261 br_stp_set_bridge_priority(br, args[1]);
262 spin_unlock_bh(&br->lock);
263 return 0;
264
265 case BRCTL_SET_PORT_PRIORITY:
266 {
267 struct net_bridge_port *p;
268 int ret = 0;
269
270 if (!capable(CAP_NET_ADMIN))
271 return -EPERM;
272
273 if (args[2] >= (1<<(16-BR_PORT_BITS)))
274 return -ERANGE;
275
276 spin_lock_bh(&br->lock);
277 if ((p = br_get_port(br, args[1])) == NULL)
278 ret = -EINVAL;
279 else
280 br_stp_set_port_priority(p, args[2]);
281 spin_unlock_bh(&br->lock);
282 return ret;
283 }
284
285 case BRCTL_SET_PATH_COST:
286 {
287 struct net_bridge_port *p;
288 int ret = 0;
289
290 if (!capable(CAP_NET_ADMIN))
291 return -EPERM;
292
293 spin_lock_bh(&br->lock);
294 if ((p = br_get_port(br, args[1])) == NULL)
295 ret = -EINVAL;
296 else
297 br_stp_set_path_cost(p, args[2]);
298 spin_unlock_bh(&br->lock);
299 return ret;
300 }
301
302 case BRCTL_GET_FDB_ENTRIES:
303 return get_fdb_entries(br, (void __user *)args[1],
304 args[2], args[3]);
305 }
306
307 return -EOPNOTSUPP;
308}
309
310static int old_deviceless(void __user *uarg)
311{
312 unsigned long args[3];
313
314 if (copy_from_user(args, uarg, sizeof(args)))
315 return -EFAULT;
316
317 switch (args[0]) {
318 case BRCTL_GET_VERSION:
319 return BRCTL_VERSION;
320
321 case BRCTL_GET_BRIDGES:
322 {
323 int *indices;
324 int ret = 0;
325
326 if (args[2] >= 2048)
327 return -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700328 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 if (indices == NULL)
330 return -ENOMEM;
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 args[2] = get_bridge_ifindices(indices, args[2]);
333
334 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
335 ? -EFAULT : args[2];
336
337 kfree(indices);
338 return ret;
339 }
340
341 case BRCTL_ADD_BRIDGE:
342 case BRCTL_DEL_BRIDGE:
343 {
344 char buf[IFNAMSIZ];
345
346 if (!capable(CAP_NET_ADMIN))
347 return -EPERM;
348
349 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
350 return -EFAULT;
351
352 buf[IFNAMSIZ-1] = 0;
353
354 if (args[0] == BRCTL_ADD_BRIDGE)
355 return br_add_bridge(buf);
356
357 return br_del_bridge(buf);
358 }
359 }
360
361 return -EOPNOTSUPP;
362}
363
364int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
365{
366 switch (cmd) {
367 case SIOCGIFBR:
368 case SIOCSIFBR:
369 return old_deviceless(uarg);
370
371 case SIOCBRADDBR:
372 case SIOCBRDELBR:
373 {
374 char buf[IFNAMSIZ];
375
376 if (!capable(CAP_NET_ADMIN))
377 return -EPERM;
378
379 if (copy_from_user(buf, uarg, IFNAMSIZ))
380 return -EFAULT;
381
382 buf[IFNAMSIZ-1] = 0;
383 if (cmd == SIOCBRADDBR)
384 return br_add_bridge(buf);
385
386 return br_del_bridge(buf);
387 }
388 }
389 return -EOPNOTSUPP;
390}
391
392int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
393{
394 struct net_bridge *br = netdev_priv(dev);
395
396 switch(cmd) {
397 case SIOCDEVPRIVATE:
398 return old_dev_ioctl(dev, rq, cmd);
399
400 case SIOCBRADDIF:
401 case SIOCBRDELIF:
402 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
403
404 }
405
406 pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
407 return -EOPNOTSUPP;
408}