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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
Pavel Emelianov7562f872007-05-03 15:13:45 -070030 for_each_netdev(dev) {
31 if (i >= num)
32 break;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090033 if (dev->priv_flags & IFF_EBRIDGE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 indices[i++] = dev->ifindex;
35 }
36
37 return i;
38}
39
40/* called with RTNL */
41static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
42{
43 struct net_bridge_port *p;
44
45 list_for_each_entry(p, &br->port_list, list) {
46 if (p->port_no < num)
47 ifindices[p->port_no] = p->dev->ifindex;
48 }
49}
50
51/*
52 * Format up to a page worth of forwarding table entries
53 * userbuf -- where to copy result
54 * maxnum -- maximum number of entries desired
55 * (limited to a page for sanity)
56 * offset -- number of records to skip
57 */
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090058static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 unsigned long maxnum, unsigned long offset)
60{
61 int num;
62 void *buf;
Chris Wrightba8379b22006-11-20 15:02:49 -080063 size_t size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Chris Wrightba8379b22006-11-20 15:02:49 -080065 /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
66 if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
Chris Wrightba8379b22006-11-20 15:02:49 -080068
69 size = maxnum * sizeof(struct __fdb_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71 buf = kmalloc(size, GFP_USER);
72 if (!buf)
73 return -ENOMEM;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090074
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 num = br_fdb_fillbuf(br, buf, maxnum, offset);
76 if (num > 0) {
77 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
78 num = -EFAULT;
79 }
80 kfree(buf);
81
82 return num;
83}
84
85static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
86{
87 struct net_device *dev;
88 int ret;
89
90 if (!capable(CAP_NET_ADMIN))
91 return -EPERM;
92
93 dev = dev_get_by_index(ifindex);
94 if (dev == NULL)
95 return -EINVAL;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 if (isadd)
98 ret = br_add_if(br, dev);
99 else
100 ret = br_del_if(br, dev);
101
102 dev_put(dev);
103 return ret;
104}
105
106/*
107 * Legacy ioctl's through SIOCDEVPRIVATE
108 * This interface is deprecated because it was too difficult to
109 * to do the translation for 32/64bit ioctl compatability.
110 */
111static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
112{
113 struct net_bridge *br = netdev_priv(dev);
114 unsigned long args[4];
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 if (copy_from_user(args, rq->ifr_data, sizeof(args)))
117 return -EFAULT;
118
119 switch (args[0]) {
120 case BRCTL_ADD_IF:
121 case BRCTL_DEL_IF:
122 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
123
124 case BRCTL_GET_BRIDGE_INFO:
125 {
126 struct __bridge_info b;
127
128 memset(&b, 0, sizeof(struct __bridge_info));
129 rcu_read_lock();
130 memcpy(&b.designated_root, &br->designated_root, 8);
131 memcpy(&b.bridge_id, &br->bridge_id, 8);
132 b.root_path_cost = br->root_path_cost;
133 b.max_age = jiffies_to_clock_t(br->max_age);
134 b.hello_time = jiffies_to_clock_t(br->hello_time);
135 b.forward_delay = br->forward_delay;
136 b.bridge_max_age = br->bridge_max_age;
137 b.bridge_hello_time = br->bridge_hello_time;
138 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
139 b.topology_change = br->topology_change;
140 b.topology_change_detected = br->topology_change_detected;
141 b.root_port = br->root_port;
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700142
143 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
145 b.hello_timer_value = br_timer_value(&br->hello_timer);
146 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
147 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
148 b.gc_timer_value = br_timer_value(&br->gc_timer);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900149 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
152 return -EFAULT;
153
154 return 0;
155 }
156
157 case BRCTL_GET_PORT_LIST:
158 {
159 int num, *indices;
160
161 num = args[2];
162 if (num < 0)
163 return -EINVAL;
164 if (num == 0)
165 num = 256;
166 if (num > BR_MAX_PORTS)
167 num = BR_MAX_PORTS;
168
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700169 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (indices == NULL)
171 return -ENOMEM;
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 get_port_ifindices(br, indices, num);
174 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
175 num = -EFAULT;
176 kfree(indices);
177 return num;
178 }
179
180 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
181 if (!capable(CAP_NET_ADMIN))
182 return -EPERM;
183
184 spin_lock_bh(&br->lock);
185 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
186 if (br_is_root_bridge(br))
187 br->forward_delay = br->bridge_forward_delay;
188 spin_unlock_bh(&br->lock);
189 return 0;
190
191 case BRCTL_SET_BRIDGE_HELLO_TIME:
192 if (!capable(CAP_NET_ADMIN))
193 return -EPERM;
194
195 spin_lock_bh(&br->lock);
196 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
197 if (br_is_root_bridge(br))
198 br->hello_time = br->bridge_hello_time;
199 spin_unlock_bh(&br->lock);
200 return 0;
201
202 case BRCTL_SET_BRIDGE_MAX_AGE:
203 if (!capable(CAP_NET_ADMIN))
204 return -EPERM;
205
206 spin_lock_bh(&br->lock);
207 br->bridge_max_age = clock_t_to_jiffies(args[1]);
208 if (br_is_root_bridge(br))
209 br->max_age = br->bridge_max_age;
210 spin_unlock_bh(&br->lock);
211 return 0;
212
213 case BRCTL_SET_AGEING_TIME:
214 if (!capable(CAP_NET_ADMIN))
215 return -EPERM;
216
217 br->ageing_time = clock_t_to_jiffies(args[1]);
218 return 0;
219
220 case BRCTL_GET_PORT_INFO:
221 {
222 struct __port_info p;
223 struct net_bridge_port *pt;
224
225 rcu_read_lock();
226 if ((pt = br_get_port(br, args[2])) == NULL) {
227 rcu_read_unlock();
228 return -EINVAL;
229 }
230
231 memset(&p, 0, sizeof(struct __port_info));
232 memcpy(&p.designated_root, &pt->designated_root, 8);
233 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
234 p.port_id = pt->port_id;
235 p.designated_port = pt->designated_port;
236 p.path_cost = pt->path_cost;
237 p.designated_cost = pt->designated_cost;
238 p.state = pt->state;
239 p.top_change_ack = pt->topology_change_ack;
240 p.config_pending = pt->config_pending;
241 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
242 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
243 p.hold_timer_value = br_timer_value(&pt->hold_timer);
244
245 rcu_read_unlock();
246
247 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
248 return -EFAULT;
249
250 return 0;
251 }
252
253 case BRCTL_SET_BRIDGE_STP_STATE:
254 if (!capable(CAP_NET_ADMIN))
255 return -EPERM;
256
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700257 br_stp_set_enabled(br, args[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return 0;
259
260 case BRCTL_SET_BRIDGE_PRIORITY:
261 if (!capable(CAP_NET_ADMIN))
262 return -EPERM;
263
264 spin_lock_bh(&br->lock);
265 br_stp_set_bridge_priority(br, args[1]);
266 spin_unlock_bh(&br->lock);
267 return 0;
268
269 case BRCTL_SET_PORT_PRIORITY:
270 {
271 struct net_bridge_port *p;
272 int ret = 0;
273
274 if (!capable(CAP_NET_ADMIN))
275 return -EPERM;
276
277 if (args[2] >= (1<<(16-BR_PORT_BITS)))
278 return -ERANGE;
279
280 spin_lock_bh(&br->lock);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900281 if ((p = br_get_port(br, args[1])) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 ret = -EINVAL;
283 else
284 br_stp_set_port_priority(p, args[2]);
285 spin_unlock_bh(&br->lock);
286 return ret;
287 }
288
289 case BRCTL_SET_PATH_COST:
290 {
291 struct net_bridge_port *p;
292 int ret = 0;
293
294 if (!capable(CAP_NET_ADMIN))
295 return -EPERM;
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 if ((p = br_get_port(br, args[1])) == NULL)
298 ret = -EINVAL;
299 else
300 br_stp_set_path_cost(p, args[2]);
Stephen Hemminger6548cda2007-02-27 09:55:07 -0800301
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 return ret;
303 }
304
305 case BRCTL_GET_FDB_ENTRIES:
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900306 return get_fdb_entries(br, (void __user *)args[1],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 args[2], args[3]);
308 }
309
310 return -EOPNOTSUPP;
311}
312
313static int old_deviceless(void __user *uarg)
314{
315 unsigned long args[3];
316
317 if (copy_from_user(args, uarg, sizeof(args)))
318 return -EFAULT;
319
320 switch (args[0]) {
321 case BRCTL_GET_VERSION:
322 return BRCTL_VERSION;
323
324 case BRCTL_GET_BRIDGES:
325 {
326 int *indices;
327 int ret = 0;
328
329 if (args[2] >= 2048)
330 return -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700331 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 if (indices == NULL)
333 return -ENOMEM;
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 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);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 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}