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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;
Chris Wrightba8379b22006-11-20 15:02:49 -080061 size_t size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Chris Wrightba8379b22006-11-20 15:02:49 -080063 /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
64 if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
Chris Wrightba8379b22006-11-20 15:02:49 -080066
67 size = maxnum * sizeof(struct __fdb_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69 buf = kmalloc(size, GFP_USER);
70 if (!buf)
71 return -ENOMEM;
72
73 num = br_fdb_fillbuf(br, buf, maxnum, offset);
74 if (num > 0) {
75 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
76 num = -EFAULT;
77 }
78 kfree(buf);
79
80 return num;
81}
82
83static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
84{
85 struct net_device *dev;
86 int ret;
87
88 if (!capable(CAP_NET_ADMIN))
89 return -EPERM;
90
91 dev = dev_get_by_index(ifindex);
92 if (dev == NULL)
93 return -EINVAL;
94
95 if (isadd)
96 ret = br_add_if(br, dev);
97 else
98 ret = br_del_if(br, dev);
99
100 dev_put(dev);
101 return ret;
102}
103
104/*
105 * Legacy ioctl's through SIOCDEVPRIVATE
106 * This interface is deprecated because it was too difficult to
107 * to do the translation for 32/64bit ioctl compatability.
108 */
109static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
110{
111 struct net_bridge *br = netdev_priv(dev);
112 unsigned long args[4];
113
114 if (copy_from_user(args, rq->ifr_data, sizeof(args)))
115 return -EFAULT;
116
117 switch (args[0]) {
118 case BRCTL_ADD_IF:
119 case BRCTL_DEL_IF:
120 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
121
122 case BRCTL_GET_BRIDGE_INFO:
123 {
124 struct __bridge_info b;
125
126 memset(&b, 0, sizeof(struct __bridge_info));
127 rcu_read_lock();
128 memcpy(&b.designated_root, &br->designated_root, 8);
129 memcpy(&b.bridge_id, &br->bridge_id, 8);
130 b.root_path_cost = br->root_path_cost;
131 b.max_age = jiffies_to_clock_t(br->max_age);
132 b.hello_time = jiffies_to_clock_t(br->hello_time);
133 b.forward_delay = br->forward_delay;
134 b.bridge_max_age = br->bridge_max_age;
135 b.bridge_hello_time = br->bridge_hello_time;
136 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
137 b.topology_change = br->topology_change;
138 b.topology_change_detected = br->topology_change_detected;
139 b.root_port = br->root_port;
140 b.stp_enabled = br->stp_enabled;
141 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
142 b.hello_timer_value = br_timer_value(&br->hello_timer);
143 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
144 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
145 b.gc_timer_value = br_timer_value(&br->gc_timer);
146 rcu_read_unlock();
147
148 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
149 return -EFAULT;
150
151 return 0;
152 }
153
154 case BRCTL_GET_PORT_LIST:
155 {
156 int num, *indices;
157
158 num = args[2];
159 if (num < 0)
160 return -EINVAL;
161 if (num == 0)
162 num = 256;
163 if (num > BR_MAX_PORTS)
164 num = BR_MAX_PORTS;
165
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700166 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 if (indices == NULL)
168 return -ENOMEM;
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 get_port_ifindices(br, indices, num);
171 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
172 num = -EFAULT;
173 kfree(indices);
174 return num;
175 }
176
177 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
178 if (!capable(CAP_NET_ADMIN))
179 return -EPERM;
180
181 spin_lock_bh(&br->lock);
182 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
183 if (br_is_root_bridge(br))
184 br->forward_delay = br->bridge_forward_delay;
185 spin_unlock_bh(&br->lock);
186 return 0;
187
188 case BRCTL_SET_BRIDGE_HELLO_TIME:
189 if (!capable(CAP_NET_ADMIN))
190 return -EPERM;
191
192 spin_lock_bh(&br->lock);
193 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
194 if (br_is_root_bridge(br))
195 br->hello_time = br->bridge_hello_time;
196 spin_unlock_bh(&br->lock);
197 return 0;
198
199 case BRCTL_SET_BRIDGE_MAX_AGE:
200 if (!capable(CAP_NET_ADMIN))
201 return -EPERM;
202
203 spin_lock_bh(&br->lock);
204 br->bridge_max_age = clock_t_to_jiffies(args[1]);
205 if (br_is_root_bridge(br))
206 br->max_age = br->bridge_max_age;
207 spin_unlock_bh(&br->lock);
208 return 0;
209
210 case BRCTL_SET_AGEING_TIME:
211 if (!capable(CAP_NET_ADMIN))
212 return -EPERM;
213
214 br->ageing_time = clock_t_to_jiffies(args[1]);
215 return 0;
216
217 case BRCTL_GET_PORT_INFO:
218 {
219 struct __port_info p;
220 struct net_bridge_port *pt;
221
222 rcu_read_lock();
223 if ((pt = br_get_port(br, args[2])) == NULL) {
224 rcu_read_unlock();
225 return -EINVAL;
226 }
227
228 memset(&p, 0, sizeof(struct __port_info));
229 memcpy(&p.designated_root, &pt->designated_root, 8);
230 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
231 p.port_id = pt->port_id;
232 p.designated_port = pt->designated_port;
233 p.path_cost = pt->path_cost;
234 p.designated_cost = pt->designated_cost;
235 p.state = pt->state;
236 p.top_change_ack = pt->topology_change_ack;
237 p.config_pending = pt->config_pending;
238 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
239 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
240 p.hold_timer_value = br_timer_value(&pt->hold_timer);
241
242 rcu_read_unlock();
243
244 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
245 return -EFAULT;
246
247 return 0;
248 }
249
250 case BRCTL_SET_BRIDGE_STP_STATE:
251 if (!capable(CAP_NET_ADMIN))
252 return -EPERM;
253
254 br->stp_enabled = args[1]?1:0;
255 return 0;
256
257 case BRCTL_SET_BRIDGE_PRIORITY:
258 if (!capable(CAP_NET_ADMIN))
259 return -EPERM;
260
261 spin_lock_bh(&br->lock);
262 br_stp_set_bridge_priority(br, args[1]);
263 spin_unlock_bh(&br->lock);
264 return 0;
265
266 case BRCTL_SET_PORT_PRIORITY:
267 {
268 struct net_bridge_port *p;
269 int ret = 0;
270
271 if (!capable(CAP_NET_ADMIN))
272 return -EPERM;
273
274 if (args[2] >= (1<<(16-BR_PORT_BITS)))
275 return -ERANGE;
276
277 spin_lock_bh(&br->lock);
278 if ((p = br_get_port(br, args[1])) == NULL)
279 ret = -EINVAL;
280 else
281 br_stp_set_port_priority(p, args[2]);
282 spin_unlock_bh(&br->lock);
283 return ret;
284 }
285
286 case BRCTL_SET_PATH_COST:
287 {
288 struct net_bridge_port *p;
289 int ret = 0;
290
291 if (!capable(CAP_NET_ADMIN))
292 return -EPERM;
293
294 spin_lock_bh(&br->lock);
295 if ((p = br_get_port(br, args[1])) == NULL)
296 ret = -EINVAL;
297 else
298 br_stp_set_path_cost(p, args[2]);
299 spin_unlock_bh(&br->lock);
300 return ret;
301 }
302
303 case BRCTL_GET_FDB_ENTRIES:
304 return get_fdb_entries(br, (void __user *)args[1],
305 args[2], args[3]);
306 }
307
308 return -EOPNOTSUPP;
309}
310
311static int old_deviceless(void __user *uarg)
312{
313 unsigned long args[3];
314
315 if (copy_from_user(args, uarg, sizeof(args)))
316 return -EFAULT;
317
318 switch (args[0]) {
319 case BRCTL_GET_VERSION:
320 return BRCTL_VERSION;
321
322 case BRCTL_GET_BRIDGES:
323 {
324 int *indices;
325 int ret = 0;
326
327 if (args[2] >= 2048)
328 return -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700329 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 if (indices == NULL)
331 return -ENOMEM;
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 args[2] = get_bridge_ifindices(indices, args[2]);
334
335 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
336 ? -EFAULT : args[2];
337
338 kfree(indices);
339 return ret;
340 }
341
342 case BRCTL_ADD_BRIDGE:
343 case BRCTL_DEL_BRIDGE:
344 {
345 char buf[IFNAMSIZ];
346
347 if (!capable(CAP_NET_ADMIN))
348 return -EPERM;
349
350 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
351 return -EFAULT;
352
353 buf[IFNAMSIZ-1] = 0;
354
355 if (args[0] == BRCTL_ADD_BRIDGE)
356 return br_add_bridge(buf);
357
358 return br_del_bridge(buf);
359 }
360 }
361
362 return -EOPNOTSUPP;
363}
364
365int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
366{
367 switch (cmd) {
368 case SIOCGIFBR:
369 case SIOCSIFBR:
370 return old_deviceless(uarg);
371
372 case SIOCBRADDBR:
373 case SIOCBRDELBR:
374 {
375 char buf[IFNAMSIZ];
376
377 if (!capable(CAP_NET_ADMIN))
378 return -EPERM;
379
380 if (copy_from_user(buf, uarg, IFNAMSIZ))
381 return -EFAULT;
382
383 buf[IFNAMSIZ-1] = 0;
384 if (cmd == SIOCBRADDBR)
385 return br_add_bridge(buf);
386
387 return br_del_bridge(buf);
388 }
389 }
390 return -EOPNOTSUPP;
391}
392
393int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
394{
395 struct net_bridge *br = netdev_priv(dev);
396
397 switch(cmd) {
398 case SIOCDEVPRIVATE:
399 return old_dev_ioctl(dev, rq, cmd);
400
401 case SIOCBRADDIF:
402 case SIOCBRDELIF:
403 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
404
405 }
406
407 pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
408 return -EOPNOTSUPP;
409}