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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
165 indices = kmalloc(num*sizeof(int), GFP_KERNEL);
166 if (indices == NULL)
167 return -ENOMEM;
168
169 memset(indices, 0, num*sizeof(int));
170
171 get_port_ifindices(br, indices, num);
172 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
173 num = -EFAULT;
174 kfree(indices);
175 return num;
176 }
177
178 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
179 if (!capable(CAP_NET_ADMIN))
180 return -EPERM;
181
182 spin_lock_bh(&br->lock);
183 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
184 if (br_is_root_bridge(br))
185 br->forward_delay = br->bridge_forward_delay;
186 spin_unlock_bh(&br->lock);
187 return 0;
188
189 case BRCTL_SET_BRIDGE_HELLO_TIME:
190 if (!capable(CAP_NET_ADMIN))
191 return -EPERM;
192
193 spin_lock_bh(&br->lock);
194 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
195 if (br_is_root_bridge(br))
196 br->hello_time = br->bridge_hello_time;
197 spin_unlock_bh(&br->lock);
198 return 0;
199
200 case BRCTL_SET_BRIDGE_MAX_AGE:
201 if (!capable(CAP_NET_ADMIN))
202 return -EPERM;
203
204 spin_lock_bh(&br->lock);
205 br->bridge_max_age = clock_t_to_jiffies(args[1]);
206 if (br_is_root_bridge(br))
207 br->max_age = br->bridge_max_age;
208 spin_unlock_bh(&br->lock);
209 return 0;
210
211 case BRCTL_SET_AGEING_TIME:
212 if (!capable(CAP_NET_ADMIN))
213 return -EPERM;
214
215 br->ageing_time = clock_t_to_jiffies(args[1]);
216 return 0;
217
218 case BRCTL_GET_PORT_INFO:
219 {
220 struct __port_info p;
221 struct net_bridge_port *pt;
222
223 rcu_read_lock();
224 if ((pt = br_get_port(br, args[2])) == NULL) {
225 rcu_read_unlock();
226 return -EINVAL;
227 }
228
229 memset(&p, 0, sizeof(struct __port_info));
230 memcpy(&p.designated_root, &pt->designated_root, 8);
231 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
232 p.port_id = pt->port_id;
233 p.designated_port = pt->designated_port;
234 p.path_cost = pt->path_cost;
235 p.designated_cost = pt->designated_cost;
236 p.state = pt->state;
237 p.top_change_ack = pt->topology_change_ack;
238 p.config_pending = pt->config_pending;
239 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
240 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
241 p.hold_timer_value = br_timer_value(&pt->hold_timer);
242
243 rcu_read_unlock();
244
245 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
246 return -EFAULT;
247
248 return 0;
249 }
250
251 case BRCTL_SET_BRIDGE_STP_STATE:
252 if (!capable(CAP_NET_ADMIN))
253 return -EPERM;
254
255 br->stp_enabled = args[1]?1:0;
256 return 0;
257
258 case BRCTL_SET_BRIDGE_PRIORITY:
259 if (!capable(CAP_NET_ADMIN))
260 return -EPERM;
261
262 spin_lock_bh(&br->lock);
263 br_stp_set_bridge_priority(br, args[1]);
264 spin_unlock_bh(&br->lock);
265 return 0;
266
267 case BRCTL_SET_PORT_PRIORITY:
268 {
269 struct net_bridge_port *p;
270 int ret = 0;
271
272 if (!capable(CAP_NET_ADMIN))
273 return -EPERM;
274
275 if (args[2] >= (1<<(16-BR_PORT_BITS)))
276 return -ERANGE;
277
278 spin_lock_bh(&br->lock);
279 if ((p = br_get_port(br, args[1])) == NULL)
280 ret = -EINVAL;
281 else
282 br_stp_set_port_priority(p, args[2]);
283 spin_unlock_bh(&br->lock);
284 return ret;
285 }
286
287 case BRCTL_SET_PATH_COST:
288 {
289 struct net_bridge_port *p;
290 int ret = 0;
291
292 if (!capable(CAP_NET_ADMIN))
293 return -EPERM;
294
295 spin_lock_bh(&br->lock);
296 if ((p = br_get_port(br, args[1])) == NULL)
297 ret = -EINVAL;
298 else
299 br_stp_set_path_cost(p, args[2]);
300 spin_unlock_bh(&br->lock);
301 return ret;
302 }
303
304 case BRCTL_GET_FDB_ENTRIES:
305 return get_fdb_entries(br, (void __user *)args[1],
306 args[2], args[3]);
307 }
308
309 return -EOPNOTSUPP;
310}
311
312static int old_deviceless(void __user *uarg)
313{
314 unsigned long args[3];
315
316 if (copy_from_user(args, uarg, sizeof(args)))
317 return -EFAULT;
318
319 switch (args[0]) {
320 case BRCTL_GET_VERSION:
321 return BRCTL_VERSION;
322
323 case BRCTL_GET_BRIDGES:
324 {
325 int *indices;
326 int ret = 0;
327
328 if (args[2] >= 2048)
329 return -ENOMEM;
330 indices = kmalloc(args[2]*sizeof(int), GFP_KERNEL);
331 if (indices == NULL)
332 return -ENOMEM;
333
334 memset(indices, 0, args[2]*sizeof(int));
335 args[2] = get_bridge_ifindices(indices, args[2]);
336
337 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
338 ? -EFAULT : args[2];
339
340 kfree(indices);
341 return ret;
342 }
343
344 case BRCTL_ADD_BRIDGE:
345 case BRCTL_DEL_BRIDGE:
346 {
347 char buf[IFNAMSIZ];
348
349 if (!capable(CAP_NET_ADMIN))
350 return -EPERM;
351
352 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
353 return -EFAULT;
354
355 buf[IFNAMSIZ-1] = 0;
356
357 if (args[0] == BRCTL_ADD_BRIDGE)
358 return br_add_bridge(buf);
359
360 return br_del_bridge(buf);
361 }
362 }
363
364 return -EOPNOTSUPP;
365}
366
367int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
368{
369 switch (cmd) {
370 case SIOCGIFBR:
371 case SIOCSIFBR:
372 return old_deviceless(uarg);
373
374 case SIOCBRADDBR:
375 case SIOCBRDELBR:
376 {
377 char buf[IFNAMSIZ];
378
379 if (!capable(CAP_NET_ADMIN))
380 return -EPERM;
381
382 if (copy_from_user(buf, uarg, IFNAMSIZ))
383 return -EFAULT;
384
385 buf[IFNAMSIZ-1] = 0;
386 if (cmd == SIOCBRADDBR)
387 return br_add_bridge(buf);
388
389 return br_del_bridge(buf);
390 }
391 }
392 return -EOPNOTSUPP;
393}
394
395int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
396{
397 struct net_bridge *br = netdev_priv(dev);
398
399 switch(cmd) {
400 case SIOCDEVPRIVATE:
401 return old_dev_ioctl(dev, rq, cmd);
402
403 case SIOCBRADDIF:
404 case SIOCBRDELIF:
405 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
406
407 }
408
409 pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
410 return -EOPNOTSUPP;
411}