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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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
Randy Dunlap4fc268d2006-01-11 12:17:47 -080014#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/kernel.h>
16#include <linux/if_bridge.h>
17#include <linux/netdevice.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/times.h>
Eric W. Biederman881d9662007-09-17 11:56:21 -070020#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <asm/uaccess.h>
22#include "br_private.h"
23
24/* called with RTNL */
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -070025static int get_bridge_ifindices(struct net *net, int *indices, int num)
Linus Torvalds1da177e2005-04-16 15:20:36 -070026{
27 struct net_device *dev;
28 int i = 0;
29
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -070030 for_each_netdev(net, dev) {
Pavel Emelianov7562f872007-05-03 15:13:45 -070031 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
Eric Dumazet31ef30c2009-11-05 20:47:35 -080085/* called with RTNL */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
87{
Eric W. Biedermancb990502012-11-16 03:03:08 +000088 struct net *net = dev_net(br->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 struct net_device *dev;
90 int ret;
91
Eric W. Biedermancb990502012-11-16 03:03:08 +000092 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return -EPERM;
94
Eric W. Biedermancb990502012-11-16 03:03:08 +000095 dev = __dev_get_by_index(net, ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 if (dev == NULL)
97 return -EINVAL;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +090098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (isadd)
100 ret = br_add_if(br, dev);
101 else
102 ret = br_del_if(br, dev);
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 return ret;
105}
106
107/*
108 * Legacy ioctl's through SIOCDEVPRIVATE
109 * This interface is deprecated because it was too difficult to
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300110 * to do the translation for 32/64bit ioctl compatibility.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 */
112static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
113{
114 struct net_bridge *br = netdev_priv(dev);
Xin Longbf871ad2016-04-09 00:03:33 +0800115 struct net_bridge_port *p = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 unsigned long args[4];
Xin Longbf871ad2016-04-09 00:03:33 +0800117 int ret = -EOPNOTSUPP;
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (copy_from_user(args, rq->ifr_data, sizeof(args)))
120 return -EFAULT;
121
122 switch (args[0]) {
123 case BRCTL_ADD_IF:
124 case BRCTL_DEL_IF:
125 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
126
127 case BRCTL_GET_BRIDGE_INFO:
128 {
129 struct __bridge_info b;
130
131 memset(&b, 0, sizeof(struct __bridge_info));
132 rcu_read_lock();
133 memcpy(&b.designated_root, &br->designated_root, 8);
134 memcpy(&b.bridge_id, &br->bridge_id, 8);
135 b.root_path_cost = br->root_path_cost;
136 b.max_age = jiffies_to_clock_t(br->max_age);
137 b.hello_time = jiffies_to_clock_t(br->hello_time);
138 b.forward_delay = br->forward_delay;
139 b.bridge_max_age = br->bridge_max_age;
140 b.bridge_hello_time = br->bridge_hello_time;
141 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
142 b.topology_change = br->topology_change;
143 b.topology_change_detected = br->topology_change_detected;
144 b.root_port = br->root_port;
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700145
146 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
148 b.hello_timer_value = br_timer_value(&br->hello_timer);
149 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
150 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
151 b.gc_timer_value = br_timer_value(&br->gc_timer);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900152 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
155 return -EFAULT;
156
157 return 0;
158 }
159
160 case BRCTL_GET_PORT_LIST:
161 {
162 int num, *indices;
163
164 num = args[2];
165 if (num < 0)
166 return -EINVAL;
167 if (num == 0)
168 num = 256;
169 if (num > BR_MAX_PORTS)
170 num = BR_MAX_PORTS;
171
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700172 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (indices == NULL)
174 return -ENOMEM;
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 get_port_ifindices(br, indices, num);
177 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
178 num = -EFAULT;
179 kfree(indices);
180 return num;
181 }
182
183 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000184 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return -EPERM;
186
Xin Longbf871ad2016-04-09 00:03:33 +0800187 ret = br_set_forward_delay(br, args[1]);
188 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
190 case BRCTL_SET_BRIDGE_HELLO_TIME:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000191 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return -EPERM;
193
Xin Longbf871ad2016-04-09 00:03:33 +0800194 ret = br_set_hello_time(br, args[1]);
195 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 case BRCTL_SET_BRIDGE_MAX_AGE:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000198 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 return -EPERM;
200
Xin Longbf871ad2016-04-09 00:03:33 +0800201 ret = br_set_max_age(br, args[1]);
202 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 case BRCTL_SET_AGEING_TIME:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000205 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 return -EPERM;
207
Xin Longbf871ad2016-04-09 00:03:33 +0800208 ret = br_set_ageing_time(br, args[1]);
209 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211 case BRCTL_GET_PORT_INFO:
212 {
213 struct __port_info p;
214 struct net_bridge_port *pt;
215
216 rcu_read_lock();
217 if ((pt = br_get_port(br, args[2])) == NULL) {
218 rcu_read_unlock();
219 return -EINVAL;
220 }
221
222 memset(&p, 0, sizeof(struct __port_info));
223 memcpy(&p.designated_root, &pt->designated_root, 8);
224 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
225 p.port_id = pt->port_id;
226 p.designated_port = pt->designated_port;
227 p.path_cost = pt->path_cost;
228 p.designated_cost = pt->designated_cost;
229 p.state = pt->state;
230 p.top_change_ack = pt->topology_change_ack;
231 p.config_pending = pt->config_pending;
232 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
233 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
234 p.hold_timer_value = br_timer_value(&pt->hold_timer);
235
236 rcu_read_unlock();
237
238 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
239 return -EFAULT;
240
241 return 0;
242 }
243
244 case BRCTL_SET_BRIDGE_STP_STATE:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000245 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 return -EPERM;
247
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700248 br_stp_set_enabled(br, args[1]);
Xin Longbf871ad2016-04-09 00:03:33 +0800249 ret = 0;
250 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 case BRCTL_SET_BRIDGE_PRIORITY:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000253 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 return -EPERM;
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 br_stp_set_bridge_priority(br, args[1]);
Xin Longbf871ad2016-04-09 00:03:33 +0800257 ret = 0;
258 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260 case BRCTL_SET_PORT_PRIORITY:
261 {
Eric W. Biedermancb990502012-11-16 03:03:08 +0000262 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 return -EPERM;
264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 spin_lock_bh(&br->lock);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900266 if ((p = br_get_port(br, args[1])) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 ret = -EINVAL;
268 else
stephen hemminger14f98f22011-04-04 14:03:33 +0000269 ret = br_stp_set_port_priority(p, args[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 spin_unlock_bh(&br->lock);
Xin Longbf871ad2016-04-09 00:03:33 +0800271 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273
274 case BRCTL_SET_PATH_COST:
275 {
Eric W. Biedermancb990502012-11-16 03:03:08 +0000276 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return -EPERM;
278
stephen hemminger14f98f22011-04-04 14:03:33 +0000279 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if ((p = br_get_port(br, args[1])) == NULL)
281 ret = -EINVAL;
282 else
stephen hemminger14f98f22011-04-04 14:03:33 +0000283 ret = br_stp_set_path_cost(p, args[2]);
284 spin_unlock_bh(&br->lock);
Xin Longbf871ad2016-04-09 00:03:33 +0800285 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
287
288 case BRCTL_GET_FDB_ENTRIES:
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900289 return get_fdb_entries(br, (void __user *)args[1],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 args[2], args[3]);
291 }
292
Xin Longbf871ad2016-04-09 00:03:33 +0800293 if (!ret) {
294 if (p)
295 br_ifinfo_notify(RTM_NEWLINK, p);
296 else
297 netdev_state_change(br->dev);
298 }
299
300 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700303static int old_deviceless(struct net *net, void __user *uarg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304{
305 unsigned long args[3];
306
307 if (copy_from_user(args, uarg, sizeof(args)))
308 return -EFAULT;
309
310 switch (args[0]) {
311 case BRCTL_GET_VERSION:
312 return BRCTL_VERSION;
313
314 case BRCTL_GET_BRIDGES:
315 {
316 int *indices;
317 int ret = 0;
318
319 if (args[2] >= 2048)
320 return -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700321 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 if (indices == NULL)
323 return -ENOMEM;
324
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700325 args[2] = get_bridge_ifindices(net, indices, args[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
328 ? -EFAULT : args[2];
329
330 kfree(indices);
331 return ret;
332 }
333
334 case BRCTL_ADD_BRIDGE:
335 case BRCTL_DEL_BRIDGE:
336 {
337 char buf[IFNAMSIZ];
338
Eric W. Biedermancb990502012-11-16 03:03:08 +0000339 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 return -EPERM;
341
342 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
343 return -EFAULT;
344
345 buf[IFNAMSIZ-1] = 0;
346
347 if (args[0] == BRCTL_ADD_BRIDGE)
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700348 return br_add_bridge(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700350 return br_del_bridge(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
352 }
353
354 return -EOPNOTSUPP;
355}
356
Eric W. Biederman881d9662007-09-17 11:56:21 -0700357int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358{
359 switch (cmd) {
360 case SIOCGIFBR:
361 case SIOCSIFBR:
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700362 return old_deviceless(net, uarg);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900363
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 case SIOCBRADDBR:
365 case SIOCBRDELBR:
366 {
367 char buf[IFNAMSIZ];
368
Eric W. Biedermancb990502012-11-16 03:03:08 +0000369 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return -EPERM;
371
372 if (copy_from_user(buf, uarg, IFNAMSIZ))
373 return -EFAULT;
374
375 buf[IFNAMSIZ-1] = 0;
376 if (cmd == SIOCBRADDBR)
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700377 return br_add_bridge(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700379 return br_del_bridge(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 }
381 }
382 return -EOPNOTSUPP;
383}
384
385int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
386{
387 struct net_bridge *br = netdev_priv(dev);
388
tanxiaojun31a5b832013-12-19 13:28:12 +0800389 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 case SIOCDEVPRIVATE:
391 return old_dev_ioctl(dev, rq, cmd);
392
393 case SIOCBRADDIF:
394 case SIOCBRDELIF:
395 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
396
397 }
398
stephen hemminger28a16c92010-05-10 09:31:09 +0000399 br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 return -EOPNOTSUPP;
401}