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1da177e4 LT |
1 | /* |
2 | * Ioctl handler | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
1da177e4 LT |
8 | * 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 | ||
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/if_bridge.h> | |
17 | #include <linux/netdevice.h> | |
18 | #include <linux/times.h> | |
881d966b | 19 | #include <net/net_namespace.h> |
1da177e4 LT |
20 | #include <asm/uaccess.h> |
21 | #include "br_private.h" | |
22 | ||
23 | /* called with RTNL */ | |
24 | static int get_bridge_ifindices(int *indices, int num) | |
25 | { | |
26 | struct net_device *dev; | |
27 | int i = 0; | |
28 | ||
881d966b | 29 | for_each_netdev(&init_net, dev) { |
7562f876 PE |
30 | if (i >= num) |
31 | break; | |
9d6f229f | 32 | if (dev->priv_flags & IFF_EBRIDGE) |
1da177e4 LT |
33 | indices[i++] = dev->ifindex; |
34 | } | |
35 | ||
36 | return i; | |
37 | } | |
38 | ||
39 | /* called with RTNL */ | |
40 | static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num) | |
41 | { | |
42 | struct net_bridge_port *p; | |
43 | ||
44 | list_for_each_entry(p, &br->port_list, list) { | |
45 | if (p->port_no < num) | |
46 | ifindices[p->port_no] = p->dev->ifindex; | |
47 | } | |
48 | } | |
49 | ||
50 | /* | |
51 | * Format up to a page worth of forwarding table entries | |
52 | * userbuf -- where to copy result | |
53 | * maxnum -- maximum number of entries desired | |
54 | * (limited to a page for sanity) | |
55 | * offset -- number of records to skip | |
56 | */ | |
9d6f229f | 57 | static int get_fdb_entries(struct net_bridge *br, void __user *userbuf, |
1da177e4 LT |
58 | unsigned long maxnum, unsigned long offset) |
59 | { | |
60 | int num; | |
61 | void *buf; | |
ba8379b2 | 62 | size_t size; |
1da177e4 | 63 | |
ba8379b2 CW |
64 | /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */ |
65 | if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry)) | |
1da177e4 | 66 | maxnum = PAGE_SIZE/sizeof(struct __fdb_entry); |
ba8379b2 CW |
67 | |
68 | size = maxnum * sizeof(struct __fdb_entry); | |
1da177e4 LT |
69 | |
70 | buf = kmalloc(size, GFP_USER); | |
71 | if (!buf) | |
72 | return -ENOMEM; | |
9d6f229f | 73 | |
1da177e4 LT |
74 | num = br_fdb_fillbuf(br, buf, maxnum, offset); |
75 | if (num > 0) { | |
76 | if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry))) | |
77 | num = -EFAULT; | |
78 | } | |
79 | kfree(buf); | |
80 | ||
81 | return num; | |
82 | } | |
83 | ||
84 | static int add_del_if(struct net_bridge *br, int ifindex, int isadd) | |
85 | { | |
86 | struct net_device *dev; | |
87 | int ret; | |
88 | ||
89 | if (!capable(CAP_NET_ADMIN)) | |
90 | return -EPERM; | |
91 | ||
881d966b | 92 | dev = dev_get_by_index(&init_net, ifindex); |
1da177e4 LT |
93 | if (dev == NULL) |
94 | return -EINVAL; | |
9d6f229f | 95 | |
1da177e4 LT |
96 | if (isadd) |
97 | ret = br_add_if(br, dev); | |
98 | else | |
99 | ret = br_del_if(br, dev); | |
100 | ||
101 | dev_put(dev); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Legacy ioctl's through SIOCDEVPRIVATE | |
107 | * This interface is deprecated because it was too difficult to | |
108 | * to do the translation for 32/64bit ioctl compatability. | |
109 | */ | |
110 | static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
111 | { | |
112 | struct net_bridge *br = netdev_priv(dev); | |
113 | unsigned long args[4]; | |
9d6f229f | 114 | |
1da177e4 LT |
115 | if (copy_from_user(args, rq->ifr_data, sizeof(args))) |
116 | return -EFAULT; | |
117 | ||
118 | switch (args[0]) { | |
119 | case BRCTL_ADD_IF: | |
120 | case BRCTL_DEL_IF: | |
121 | return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF); | |
122 | ||
123 | case BRCTL_GET_BRIDGE_INFO: | |
124 | { | |
125 | struct __bridge_info b; | |
126 | ||
127 | memset(&b, 0, sizeof(struct __bridge_info)); | |
128 | rcu_read_lock(); | |
129 | memcpy(&b.designated_root, &br->designated_root, 8); | |
130 | memcpy(&b.bridge_id, &br->bridge_id, 8); | |
131 | b.root_path_cost = br->root_path_cost; | |
132 | b.max_age = jiffies_to_clock_t(br->max_age); | |
133 | b.hello_time = jiffies_to_clock_t(br->hello_time); | |
134 | b.forward_delay = br->forward_delay; | |
135 | b.bridge_max_age = br->bridge_max_age; | |
136 | b.bridge_hello_time = br->bridge_hello_time; | |
137 | b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay); | |
138 | b.topology_change = br->topology_change; | |
139 | b.topology_change_detected = br->topology_change_detected; | |
140 | b.root_port = br->root_port; | |
9cde0708 SH |
141 | |
142 | b.stp_enabled = (br->stp_enabled != BR_NO_STP); | |
1da177e4 LT |
143 | b.ageing_time = jiffies_to_clock_t(br->ageing_time); |
144 | b.hello_timer_value = br_timer_value(&br->hello_timer); | |
145 | b.tcn_timer_value = br_timer_value(&br->tcn_timer); | |
146 | b.topology_change_timer_value = br_timer_value(&br->topology_change_timer); | |
147 | b.gc_timer_value = br_timer_value(&br->gc_timer); | |
9d6f229f | 148 | rcu_read_unlock(); |
1da177e4 LT |
149 | |
150 | if (copy_to_user((void __user *)args[1], &b, sizeof(b))) | |
151 | return -EFAULT; | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | case BRCTL_GET_PORT_LIST: | |
157 | { | |
158 | int num, *indices; | |
159 | ||
160 | num = args[2]; | |
161 | if (num < 0) | |
162 | return -EINVAL; | |
163 | if (num == 0) | |
164 | num = 256; | |
165 | if (num > BR_MAX_PORTS) | |
166 | num = BR_MAX_PORTS; | |
167 | ||
0da974f4 | 168 | indices = kcalloc(num, sizeof(int), GFP_KERNEL); |
1da177e4 LT |
169 | if (indices == NULL) |
170 | return -ENOMEM; | |
171 | ||
1da177e4 LT |
172 | get_port_ifindices(br, indices, num); |
173 | if (copy_to_user((void __user *)args[1], indices, num*sizeof(int))) | |
174 | num = -EFAULT; | |
175 | kfree(indices); | |
176 | return num; | |
177 | } | |
178 | ||
179 | case BRCTL_SET_BRIDGE_FORWARD_DELAY: | |
180 | if (!capable(CAP_NET_ADMIN)) | |
181 | return -EPERM; | |
182 | ||
183 | spin_lock_bh(&br->lock); | |
184 | br->bridge_forward_delay = clock_t_to_jiffies(args[1]); | |
185 | if (br_is_root_bridge(br)) | |
186 | br->forward_delay = br->bridge_forward_delay; | |
187 | spin_unlock_bh(&br->lock); | |
188 | return 0; | |
189 | ||
190 | case BRCTL_SET_BRIDGE_HELLO_TIME: | |
191 | if (!capable(CAP_NET_ADMIN)) | |
192 | return -EPERM; | |
193 | ||
194 | spin_lock_bh(&br->lock); | |
195 | br->bridge_hello_time = clock_t_to_jiffies(args[1]); | |
196 | if (br_is_root_bridge(br)) | |
197 | br->hello_time = br->bridge_hello_time; | |
198 | spin_unlock_bh(&br->lock); | |
199 | return 0; | |
200 | ||
201 | case BRCTL_SET_BRIDGE_MAX_AGE: | |
202 | if (!capable(CAP_NET_ADMIN)) | |
203 | return -EPERM; | |
204 | ||
205 | spin_lock_bh(&br->lock); | |
206 | br->bridge_max_age = clock_t_to_jiffies(args[1]); | |
207 | if (br_is_root_bridge(br)) | |
208 | br->max_age = br->bridge_max_age; | |
209 | spin_unlock_bh(&br->lock); | |
210 | return 0; | |
211 | ||
212 | case BRCTL_SET_AGEING_TIME: | |
213 | if (!capable(CAP_NET_ADMIN)) | |
214 | return -EPERM; | |
215 | ||
216 | br->ageing_time = clock_t_to_jiffies(args[1]); | |
217 | return 0; | |
218 | ||
219 | case BRCTL_GET_PORT_INFO: | |
220 | { | |
221 | struct __port_info p; | |
222 | struct net_bridge_port *pt; | |
223 | ||
224 | rcu_read_lock(); | |
225 | if ((pt = br_get_port(br, args[2])) == NULL) { | |
226 | rcu_read_unlock(); | |
227 | return -EINVAL; | |
228 | } | |
229 | ||
230 | memset(&p, 0, sizeof(struct __port_info)); | |
231 | memcpy(&p.designated_root, &pt->designated_root, 8); | |
232 | memcpy(&p.designated_bridge, &pt->designated_bridge, 8); | |
233 | p.port_id = pt->port_id; | |
234 | p.designated_port = pt->designated_port; | |
235 | p.path_cost = pt->path_cost; | |
236 | p.designated_cost = pt->designated_cost; | |
237 | p.state = pt->state; | |
238 | p.top_change_ack = pt->topology_change_ack; | |
239 | p.config_pending = pt->config_pending; | |
240 | p.message_age_timer_value = br_timer_value(&pt->message_age_timer); | |
241 | p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer); | |
242 | p.hold_timer_value = br_timer_value(&pt->hold_timer); | |
243 | ||
244 | rcu_read_unlock(); | |
245 | ||
246 | if (copy_to_user((void __user *)args[1], &p, sizeof(p))) | |
247 | return -EFAULT; | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
252 | case BRCTL_SET_BRIDGE_STP_STATE: | |
253 | if (!capable(CAP_NET_ADMIN)) | |
254 | return -EPERM; | |
255 | ||
9cde0708 | 256 | br_stp_set_enabled(br, args[1]); |
1da177e4 LT |
257 | return 0; |
258 | ||
259 | case BRCTL_SET_BRIDGE_PRIORITY: | |
260 | if (!capable(CAP_NET_ADMIN)) | |
261 | return -EPERM; | |
262 | ||
263 | spin_lock_bh(&br->lock); | |
264 | br_stp_set_bridge_priority(br, args[1]); | |
265 | spin_unlock_bh(&br->lock); | |
266 | return 0; | |
267 | ||
268 | case BRCTL_SET_PORT_PRIORITY: | |
269 | { | |
270 | struct net_bridge_port *p; | |
271 | int ret = 0; | |
272 | ||
273 | if (!capable(CAP_NET_ADMIN)) | |
274 | return -EPERM; | |
275 | ||
276 | if (args[2] >= (1<<(16-BR_PORT_BITS))) | |
277 | return -ERANGE; | |
278 | ||
279 | spin_lock_bh(&br->lock); | |
9d6f229f | 280 | if ((p = br_get_port(br, args[1])) == NULL) |
1da177e4 LT |
281 | ret = -EINVAL; |
282 | else | |
283 | br_stp_set_port_priority(p, args[2]); | |
284 | spin_unlock_bh(&br->lock); | |
285 | return ret; | |
286 | } | |
287 | ||
288 | case BRCTL_SET_PATH_COST: | |
289 | { | |
290 | struct net_bridge_port *p; | |
291 | int ret = 0; | |
292 | ||
293 | if (!capable(CAP_NET_ADMIN)) | |
294 | return -EPERM; | |
295 | ||
1da177e4 LT |
296 | if ((p = br_get_port(br, args[1])) == NULL) |
297 | ret = -EINVAL; | |
298 | else | |
299 | br_stp_set_path_cost(p, args[2]); | |
6548cda2 | 300 | |
1da177e4 LT |
301 | return ret; |
302 | } | |
303 | ||
304 | case BRCTL_GET_FDB_ENTRIES: | |
9d6f229f | 305 | return get_fdb_entries(br, (void __user *)args[1], |
1da177e4 LT |
306 | args[2], args[3]); |
307 | } | |
308 | ||
309 | return -EOPNOTSUPP; | |
310 | } | |
311 | ||
312 | static int old_deviceless(void __user *uarg) | |
313 | { | |
314 | unsigned long args[3]; | |
315 | ||
316 | if (copy_from_user(args, uarg, sizeof(args))) | |
317 | return -EFAULT; | |
318 | ||
319 | switch (args[0]) { | |
320 | case BRCTL_GET_VERSION: | |
321 | return BRCTL_VERSION; | |
322 | ||
323 | case BRCTL_GET_BRIDGES: | |
324 | { | |
325 | int *indices; | |
326 | int ret = 0; | |
327 | ||
328 | if (args[2] >= 2048) | |
329 | return -ENOMEM; | |
0da974f4 | 330 | indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); |
1da177e4 LT |
331 | if (indices == NULL) |
332 | return -ENOMEM; | |
333 | ||
1da177e4 LT |
334 | args[2] = get_bridge_ifindices(indices, args[2]); |
335 | ||
336 | ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int)) | |
337 | ? -EFAULT : args[2]; | |
338 | ||
339 | kfree(indices); | |
340 | return ret; | |
341 | } | |
342 | ||
343 | case BRCTL_ADD_BRIDGE: | |
344 | case BRCTL_DEL_BRIDGE: | |
345 | { | |
346 | char buf[IFNAMSIZ]; | |
347 | ||
348 | if (!capable(CAP_NET_ADMIN)) | |
349 | return -EPERM; | |
350 | ||
351 | if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) | |
352 | return -EFAULT; | |
353 | ||
354 | buf[IFNAMSIZ-1] = 0; | |
355 | ||
356 | if (args[0] == BRCTL_ADD_BRIDGE) | |
357 | return br_add_bridge(buf); | |
358 | ||
359 | return br_del_bridge(buf); | |
360 | } | |
361 | } | |
362 | ||
363 | return -EOPNOTSUPP; | |
364 | } | |
365 | ||
881d966b | 366 | int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg) |
1da177e4 LT |
367 | { |
368 | switch (cmd) { | |
369 | case SIOCGIFBR: | |
370 | case SIOCSIFBR: | |
371 | return old_deviceless(uarg); | |
9d6f229f | 372 | |
1da177e4 LT |
373 | case SIOCBRADDBR: |
374 | case SIOCBRDELBR: | |
375 | { | |
376 | char buf[IFNAMSIZ]; | |
377 | ||
378 | if (!capable(CAP_NET_ADMIN)) | |
379 | return -EPERM; | |
380 | ||
381 | if (copy_from_user(buf, uarg, IFNAMSIZ)) | |
382 | return -EFAULT; | |
383 | ||
384 | buf[IFNAMSIZ-1] = 0; | |
385 | if (cmd == SIOCBRADDBR) | |
386 | return br_add_bridge(buf); | |
387 | ||
388 | return br_del_bridge(buf); | |
389 | } | |
390 | } | |
391 | return -EOPNOTSUPP; | |
392 | } | |
393 | ||
394 | int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
395 | { | |
396 | struct net_bridge *br = netdev_priv(dev); | |
397 | ||
398 | switch(cmd) { | |
399 | case SIOCDEVPRIVATE: | |
400 | return old_dev_ioctl(dev, rq, cmd); | |
401 | ||
402 | case SIOCBRADDIF: | |
403 | case SIOCBRDELIF: | |
404 | return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF); | |
405 | ||
406 | } | |
407 | ||
408 | pr_debug("Bridge does not support ioctl 0x%x\n", cmd); | |
409 | return -EOPNOTSUPP; | |
410 | } |