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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);
115 unsigned long args[4];
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 if (copy_from_user(args, rq->ifr_data, sizeof(args)))
118 return -EFAULT;
119
120 switch (args[0]) {
121 case BRCTL_ADD_IF:
122 case BRCTL_DEL_IF:
123 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
124
125 case BRCTL_GET_BRIDGE_INFO:
126 {
127 struct __bridge_info b;
128
129 memset(&b, 0, sizeof(struct __bridge_info));
130 rcu_read_lock();
131 memcpy(&b.designated_root, &br->designated_root, 8);
132 memcpy(&b.bridge_id, &br->bridge_id, 8);
133 b.root_path_cost = br->root_path_cost;
134 b.max_age = jiffies_to_clock_t(br->max_age);
135 b.hello_time = jiffies_to_clock_t(br->hello_time);
136 b.forward_delay = br->forward_delay;
137 b.bridge_max_age = br->bridge_max_age;
138 b.bridge_hello_time = br->bridge_hello_time;
139 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
140 b.topology_change = br->topology_change;
141 b.topology_change_detected = br->topology_change_detected;
142 b.root_port = br->root_port;
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700143
144 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
146 b.hello_timer_value = br_timer_value(&br->hello_timer);
147 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
148 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
149 b.gc_timer_value = br_timer_value(&br->gc_timer);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900150 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
153 return -EFAULT;
154
155 return 0;
156 }
157
158 case BRCTL_GET_PORT_LIST:
159 {
160 int num, *indices;
161
162 num = args[2];
163 if (num < 0)
164 return -EINVAL;
165 if (num == 0)
166 num = 256;
167 if (num > BR_MAX_PORTS)
168 num = BR_MAX_PORTS;
169
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700170 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 if (indices == NULL)
172 return -ENOMEM;
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 get_port_ifindices(br, indices, num);
175 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
176 num = -EFAULT;
177 kfree(indices);
178 return num;
179 }
180
181 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000182 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 return -EPERM;
184
stephen hemminger14f98f22011-04-04 14:03:33 +0000185 return br_set_forward_delay(br, args[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187 case BRCTL_SET_BRIDGE_HELLO_TIME:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000188 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return -EPERM;
190
stephen hemminger14f98f22011-04-04 14:03:33 +0000191 return br_set_hello_time(br, args[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 case BRCTL_SET_BRIDGE_MAX_AGE:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000194 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return -EPERM;
196
stephen hemminger14f98f22011-04-04 14:03:33 +0000197 return br_set_max_age(br, args[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199 case BRCTL_SET_AGEING_TIME:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000200 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 return -EPERM;
202
Scott Feldmanc62987b2015-10-08 19:23:19 -0700203 return br_set_ageing_time(br, args[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 case BRCTL_GET_PORT_INFO:
206 {
207 struct __port_info p;
208 struct net_bridge_port *pt;
209
210 rcu_read_lock();
211 if ((pt = br_get_port(br, args[2])) == NULL) {
212 rcu_read_unlock();
213 return -EINVAL;
214 }
215
216 memset(&p, 0, sizeof(struct __port_info));
217 memcpy(&p.designated_root, &pt->designated_root, 8);
218 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
219 p.port_id = pt->port_id;
220 p.designated_port = pt->designated_port;
221 p.path_cost = pt->path_cost;
222 p.designated_cost = pt->designated_cost;
223 p.state = pt->state;
224 p.top_change_ack = pt->topology_change_ack;
225 p.config_pending = pt->config_pending;
226 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
227 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
228 p.hold_timer_value = br_timer_value(&pt->hold_timer);
229
230 rcu_read_unlock();
231
232 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
233 return -EFAULT;
234
235 return 0;
236 }
237
238 case BRCTL_SET_BRIDGE_STP_STATE:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000239 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 return -EPERM;
241
Stephen Hemminger9cde0702007-03-21 14:22:44 -0700242 br_stp_set_enabled(br, args[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return 0;
244
245 case BRCTL_SET_BRIDGE_PRIORITY:
Eric W. Biedermancb990502012-11-16 03:03:08 +0000246 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 return -EPERM;
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 br_stp_set_bridge_priority(br, args[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 return 0;
251
252 case BRCTL_SET_PORT_PRIORITY:
253 {
254 struct net_bridge_port *p;
stephen hemminger14f98f22011-04-04 14:03:33 +0000255 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Eric W. Biedermancb990502012-11-16 03:03:08 +0000257 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return -EPERM;
259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 spin_lock_bh(&br->lock);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900261 if ((p = br_get_port(br, args[1])) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 ret = -EINVAL;
263 else
stephen hemminger14f98f22011-04-04 14:03:33 +0000264 ret = br_stp_set_port_priority(p, args[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 spin_unlock_bh(&br->lock);
266 return ret;
267 }
268
269 case BRCTL_SET_PATH_COST:
270 {
271 struct net_bridge_port *p;
stephen hemminger14f98f22011-04-04 14:03:33 +0000272 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Eric W. Biedermancb990502012-11-16 03:03:08 +0000274 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 return -EPERM;
276
stephen hemminger14f98f22011-04-04 14:03:33 +0000277 spin_lock_bh(&br->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 if ((p = br_get_port(br, args[1])) == NULL)
279 ret = -EINVAL;
280 else
stephen hemminger14f98f22011-04-04 14:03:33 +0000281 ret = br_stp_set_path_cost(p, args[2]);
282 spin_unlock_bh(&br->lock);
Stephen Hemminger6548cda2007-02-27 09:55:07 -0800283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return ret;
285 }
286
287 case BRCTL_GET_FDB_ENTRIES:
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900288 return get_fdb_entries(br, (void __user *)args[1],
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 args[2], args[3]);
290 }
291
292 return -EOPNOTSUPP;
293}
294
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700295static int old_deviceless(struct net *net, void __user *uarg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
297 unsigned long args[3];
298
299 if (copy_from_user(args, uarg, sizeof(args)))
300 return -EFAULT;
301
302 switch (args[0]) {
303 case BRCTL_GET_VERSION:
304 return BRCTL_VERSION;
305
306 case BRCTL_GET_BRIDGES:
307 {
308 int *indices;
309 int ret = 0;
310
311 if (args[2] >= 2048)
312 return -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700313 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 if (indices == NULL)
315 return -ENOMEM;
316
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700317 args[2] = get_bridge_ifindices(net, indices, args[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
320 ? -EFAULT : args[2];
321
322 kfree(indices);
323 return ret;
324 }
325
326 case BRCTL_ADD_BRIDGE:
327 case BRCTL_DEL_BRIDGE:
328 {
329 char buf[IFNAMSIZ];
330
Eric W. Biedermancb990502012-11-16 03:03:08 +0000331 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return -EPERM;
333
334 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
335 return -EFAULT;
336
337 buf[IFNAMSIZ-1] = 0;
338
339 if (args[0] == BRCTL_ADD_BRIDGE)
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700340 return br_add_bridge(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700342 return br_del_bridge(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 }
344 }
345
346 return -EOPNOTSUPP;
347}
348
Eric W. Biederman881d9662007-09-17 11:56:21 -0700349int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
351 switch (cmd) {
352 case SIOCGIFBR:
353 case SIOCSIFBR:
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700354 return old_deviceless(net, uarg);
YOSHIFUJI Hideaki9d6f2292007-02-09 23:24:35 +0900355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 case SIOCBRADDBR:
357 case SIOCBRDELBR:
358 {
359 char buf[IFNAMSIZ];
360
Eric W. Biedermancb990502012-11-16 03:03:08 +0000361 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 return -EPERM;
363
364 if (copy_from_user(buf, uarg, IFNAMSIZ))
365 return -EFAULT;
366
367 buf[IFNAMSIZ-1] = 0;
368 if (cmd == SIOCBRADDBR)
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700369 return br_add_bridge(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Alexey Dobriyan4aa678b2008-09-08 16:19:58 -0700371 return br_del_bridge(net, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 }
373 }
374 return -EOPNOTSUPP;
375}
376
377int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
378{
379 struct net_bridge *br = netdev_priv(dev);
380
tanxiaojun31a5b832013-12-19 13:28:12 +0800381 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 case SIOCDEVPRIVATE:
383 return old_dev_ioctl(dev, rq, cmd);
384
385 case SIOCBRADDIF:
386 case SIOCBRDELIF:
387 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
388
389 }
390
stephen hemminger28a16c92010-05-10 09:31:09 +0000391 br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return -EOPNOTSUPP;
393}