1
2
3
4
5
6
7
8
9
10
11
12
13
14#include <linux/capability.h>
15#include <linux/kernel.h>
16#include <linux/if_bridge.h>
17#include <linux/netdevice.h>
18#include <linux/slab.h>
19#include <linux/times.h>
20#include <net/net_namespace.h>
21#include <asm/uaccess.h>
22#include "br_private.h"
23
24
25static int get_bridge_ifindices(struct net *net, int *indices, int num)
26{
27 struct net_device *dev;
28 int i = 0;
29
30 for_each_netdev(net, dev) {
31 if (i >= num)
32 break;
33 if (dev->priv_flags & IFF_EBRIDGE)
34 indices[i++] = dev->ifindex;
35 }
36
37 return i;
38}
39
40
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
53
54
55
56
57
58static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
59 unsigned long maxnum, unsigned long offset)
60{
61 int num;
62 void *buf;
63 size_t size;
64
65
66 if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
67 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
68
69 size = maxnum * sizeof(struct __fdb_entry);
70
71 buf = kmalloc(size, GFP_USER);
72 if (!buf)
73 return -ENOMEM;
74
75 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
85
86static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
87{
88 struct net_device *dev;
89 int ret;
90
91 if (!capable(CAP_NET_ADMIN))
92 return -EPERM;
93
94 dev = __dev_get_by_index(dev_net(br->dev), ifindex);
95 if (dev == NULL)
96 return -EINVAL;
97
98 if (isadd)
99 ret = br_add_if(br, dev);
100 else
101 ret = br_del_if(br, dev);
102
103 return ret;
104}
105
106
107
108
109
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];
115
116 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;
142
143 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
144 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);
149 rcu_read_unlock();
150
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
169 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
170 if (indices == NULL)
171 return -ENOMEM;
172
173 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 return br_set_forward_delay(br, args[1]);
185
186 case BRCTL_SET_BRIDGE_HELLO_TIME:
187 if (!capable(CAP_NET_ADMIN))
188 return -EPERM;
189
190 return br_set_hello_time(br, args[1]);
191
192 case BRCTL_SET_BRIDGE_MAX_AGE:
193 if (!capable(CAP_NET_ADMIN))
194 return -EPERM;
195
196 return br_set_max_age(br, args[1]);
197
198 case BRCTL_SET_AGEING_TIME:
199 if (!capable(CAP_NET_ADMIN))
200 return -EPERM;
201
202 br->ageing_time = clock_t_to_jiffies(args[1]);
203 return 0;
204
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:
239 if (!capable(CAP_NET_ADMIN))
240 return -EPERM;
241
242 br_stp_set_enabled(br, args[1]);
243 return 0;
244
245 case BRCTL_SET_BRIDGE_PRIORITY:
246 if (!capable(CAP_NET_ADMIN))
247 return -EPERM;
248
249 spin_lock_bh(&br->lock);
250 br_stp_set_bridge_priority(br, args[1]);
251 spin_unlock_bh(&br->lock);
252 return 0;
253
254 case BRCTL_SET_PORT_PRIORITY:
255 {
256 struct net_bridge_port *p;
257 int ret;
258
259 if (!capable(CAP_NET_ADMIN))
260 return -EPERM;
261
262 spin_lock_bh(&br->lock);
263 if ((p = br_get_port(br, args[1])) == NULL)
264 ret = -EINVAL;
265 else
266 ret = br_stp_set_port_priority(p, args[2]);
267 spin_unlock_bh(&br->lock);
268 return ret;
269 }
270
271 case BRCTL_SET_PATH_COST:
272 {
273 struct net_bridge_port *p;
274 int ret;
275
276 if (!capable(CAP_NET_ADMIN))
277 return -EPERM;
278
279 spin_lock_bh(&br->lock);
280 if ((p = br_get_port(br, args[1])) == NULL)
281 ret = -EINVAL;
282 else
283 ret = br_stp_set_path_cost(p, args[2]);
284 spin_unlock_bh(&br->lock);
285
286 return ret;
287 }
288
289 case BRCTL_GET_FDB_ENTRIES:
290 return get_fdb_entries(br, (void __user *)args[1],
291 args[2], args[3]);
292 }
293
294 return -EOPNOTSUPP;
295}
296
297static int old_deviceless(struct net *net, void __user *uarg)
298{
299 unsigned long args[3];
300
301 if (copy_from_user(args, uarg, sizeof(args)))
302 return -EFAULT;
303
304 switch (args[0]) {
305 case BRCTL_GET_VERSION:
306 return BRCTL_VERSION;
307
308 case BRCTL_GET_BRIDGES:
309 {
310 int *indices;
311 int ret = 0;
312
313 if (args[2] >= 2048)
314 return -ENOMEM;
315 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
316 if (indices == NULL)
317 return -ENOMEM;
318
319 args[2] = get_bridge_ifindices(net, indices, args[2]);
320
321 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
322 ? -EFAULT : args[2];
323
324 kfree(indices);
325 return ret;
326 }
327
328 case BRCTL_ADD_BRIDGE:
329 case BRCTL_DEL_BRIDGE:
330 {
331 char buf[IFNAMSIZ];
332
333 if (!capable(CAP_NET_ADMIN))
334 return -EPERM;
335
336 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
337 return -EFAULT;
338
339 buf[IFNAMSIZ-1] = 0;
340
341 if (args[0] == BRCTL_ADD_BRIDGE)
342 return br_add_bridge(net, buf);
343
344 return br_del_bridge(net, buf);
345 }
346 }
347
348 return -EOPNOTSUPP;
349}
350
351int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
352{
353 switch (cmd) {
354 case SIOCGIFBR:
355 case SIOCSIFBR:
356 return old_deviceless(net, uarg);
357
358 case SIOCBRADDBR:
359 case SIOCBRDELBR:
360 {
361 char buf[IFNAMSIZ];
362
363 if (!capable(CAP_NET_ADMIN))
364 return -EPERM;
365
366 if (copy_from_user(buf, uarg, IFNAMSIZ))
367 return -EFAULT;
368
369 buf[IFNAMSIZ-1] = 0;
370 if (cmd == SIOCBRADDBR)
371 return br_add_bridge(net, buf);
372
373 return br_del_bridge(net, buf);
374 }
375 }
376 return -EOPNOTSUPP;
377}
378
379int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
380{
381 struct net_bridge *br = netdev_priv(dev);
382
383 switch(cmd) {
384 case SIOCDEVPRIVATE:
385 return old_dev_ioctl(dev, rq, cmd);
386
387 case SIOCBRADDIF:
388 case SIOCBRDELIF:
389 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
390
391 }
392
393 br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
394 return -EOPNOTSUPP;
395}
396
