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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 *net = dev_net(br->dev);
89 struct net_device *dev;
90 int ret;
91
92 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
93 return -EPERM;
94
95 dev = __dev_get_by_index(net, ifindex);
96 if (dev == NULL)
97 return -EINVAL;
98
99 if (isadd)
100 ret = br_add_if(br, dev);
101 else
102 ret = br_del_if(br, dev);
103
104 return ret;
105}
106
107
108
109
110
111
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];
116
117 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;
143
144 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
145 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);
150 rcu_read_unlock();
151
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
170 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
171 if (indices == NULL)
172 return -ENOMEM;
173
174 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:
182 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
183 return -EPERM;
184
185 return br_set_forward_delay(br, args[1]);
186
187 case BRCTL_SET_BRIDGE_HELLO_TIME:
188 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
189 return -EPERM;
190
191 return br_set_hello_time(br, args[1]);
192
193 case BRCTL_SET_BRIDGE_MAX_AGE:
194 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
195 return -EPERM;
196
197 return br_set_max_age(br, args[1]);
198
199 case BRCTL_SET_AGEING_TIME:
200 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
201 return -EPERM;
202
203 br->ageing_time = clock_t_to_jiffies(args[1]);
204 return 0;
205
206 case BRCTL_GET_PORT_INFO:
207 {
208 struct __port_info p;
209 struct net_bridge_port *pt;
210
211 rcu_read_lock();
212 if ((pt = br_get_port(br, args[2])) == NULL) {
213 rcu_read_unlock();
214 return -EINVAL;
215 }
216
217 memset(&p, 0, sizeof(struct __port_info));
218 memcpy(&p.designated_root, &pt->designated_root, 8);
219 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
220 p.port_id = pt->port_id;
221 p.designated_port = pt->designated_port;
222 p.path_cost = pt->path_cost;
223 p.designated_cost = pt->designated_cost;
224 p.state = pt->state;
225 p.top_change_ack = pt->topology_change_ack;
226 p.config_pending = pt->config_pending;
227 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
228 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
229 p.hold_timer_value = br_timer_value(&pt->hold_timer);
230
231 rcu_read_unlock();
232
233 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
234 return -EFAULT;
235
236 return 0;
237 }
238
239 case BRCTL_SET_BRIDGE_STP_STATE:
240 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
241 return -EPERM;
242
243 br_stp_set_enabled(br, args[1]);
244 return 0;
245
246 case BRCTL_SET_BRIDGE_PRIORITY:
247 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
248 return -EPERM;
249
250 spin_lock_bh(&br->lock);
251 br_stp_set_bridge_priority(br, args[1]);
252 spin_unlock_bh(&br->lock);
253 return 0;
254
255 case BRCTL_SET_PORT_PRIORITY:
256 {
257 struct net_bridge_port *p;
258 int ret;
259
260 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
261 return -EPERM;
262
263 spin_lock_bh(&br->lock);
264 if ((p = br_get_port(br, args[1])) == NULL)
265 ret = -EINVAL;
266 else
267 ret = br_stp_set_port_priority(p, args[2]);
268 spin_unlock_bh(&br->lock);
269 return ret;
270 }
271
272 case BRCTL_SET_PATH_COST:
273 {
274 struct net_bridge_port *p;
275 int ret;
276
277 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
278 return -EPERM;
279
280 spin_lock_bh(&br->lock);
281 if ((p = br_get_port(br, args[1])) == NULL)
282 ret = -EINVAL;
283 else
284 ret = br_stp_set_path_cost(p, args[2]);
285 spin_unlock_bh(&br->lock);
286
287 return ret;
288 }
289
290 case BRCTL_GET_FDB_ENTRIES:
291 return get_fdb_entries(br, (void __user *)args[1],
292 args[2], args[3]);
293 }
294
295 return -EOPNOTSUPP;
296}
297
298static int old_deviceless(struct net *net, void __user *uarg)
299{
300 unsigned long args[3];
301
302 if (copy_from_user(args, uarg, sizeof(args)))
303 return -EFAULT;
304
305 switch (args[0]) {
306 case BRCTL_GET_VERSION:
307 return BRCTL_VERSION;
308
309 case BRCTL_GET_BRIDGES:
310 {
311 int *indices;
312 int ret = 0;
313
314 if (args[2] >= 2048)
315 return -ENOMEM;
316 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
317 if (indices == NULL)
318 return -ENOMEM;
319
320 args[2] = get_bridge_ifindices(net, indices, args[2]);
321
322 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
323 ? -EFAULT : args[2];
324
325 kfree(indices);
326 return ret;
327 }
328
329 case BRCTL_ADD_BRIDGE:
330 case BRCTL_DEL_BRIDGE:
331 {
332 char buf[IFNAMSIZ];
333
334 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
335 return -EPERM;
336
337 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
338 return -EFAULT;
339
340 buf[IFNAMSIZ-1] = 0;
341
342 if (args[0] == BRCTL_ADD_BRIDGE)
343 return br_add_bridge(net, buf);
344
345 return br_del_bridge(net, buf);
346 }
347 }
348
349 return -EOPNOTSUPP;
350}
351
352int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
353{
354 switch (cmd) {
355 case SIOCGIFBR:
356 case SIOCSIFBR:
357 return old_deviceless(net, uarg);
358
359 case SIOCBRADDBR:
360 case SIOCBRDELBR:
361 {
362 char buf[IFNAMSIZ];
363
364 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
365 return -EPERM;
366
367 if (copy_from_user(buf, uarg, IFNAMSIZ))
368 return -EFAULT;
369
370 buf[IFNAMSIZ-1] = 0;
371 if (cmd == SIOCBRADDBR)
372 return br_add_bridge(net, buf);
373
374 return br_del_bridge(net, buf);
375 }
376 }
377 return -EOPNOTSUPP;
378}
379
380int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
381{
382 struct net_bridge *br = netdev_priv(dev);
383
384 switch (cmd) {
385 case SIOCDEVPRIVATE:
386 return old_dev_ioctl(dev, rq, cmd);
387
388 case SIOCBRADDIF:
389 case SIOCBRDELIF:
390 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
391
392 }
393
394 br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
395 return -EOPNOTSUPP;
396}
397
