Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 | 19 | #include <linux/times.h> |
881d966b | 20 | #include <net/net_namespace.h> |
1da177e4 LT |
21 | #include <asm/uaccess.h> |
22 | #include "br_private.h" | |
23 | ||
24 | /* called with RTNL */ | |
4aa678ba | 25 | static int get_bridge_ifindices(struct net *net, int *indices, int num) |
1da177e4 LT |
26 | { |
27 | struct net_device *dev; | |
28 | int i = 0; | |
29 | ||
4aa678ba | 30 | for_each_netdev(net, dev) { |
7562f876 PE |
31 | if (i >= num) |
32 | break; | |
9d6f229f | 33 | if (dev->priv_flags & IFF_EBRIDGE) |
1da177e4 LT |
34 | indices[i++] = dev->ifindex; |
35 | } | |
36 | ||
37 | return i; | |
38 | } | |
39 | ||
40 | /* called with RTNL */ | |
41 | static 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 | */ | |
9d6f229f | 58 | static int get_fdb_entries(struct net_bridge *br, void __user *userbuf, |
1da177e4 LT |
59 | unsigned long maxnum, unsigned long offset) |
60 | { | |
61 | int num; | |
62 | void *buf; | |
ba8379b2 | 63 | size_t size; |
1da177e4 | 64 | |
ba8379b2 CW |
65 | /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */ |
66 | if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry)) | |
1da177e4 | 67 | maxnum = PAGE_SIZE/sizeof(struct __fdb_entry); |
ba8379b2 CW |
68 | |
69 | size = maxnum * sizeof(struct __fdb_entry); | |
1da177e4 LT |
70 | |
71 | buf = kmalloc(size, GFP_USER); | |
72 | if (!buf) | |
73 | return -ENOMEM; | |
9d6f229f | 74 | |
1da177e4 LT |
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 | ||
31ef30c7 | 85 | /* called with RTNL */ |
1da177e4 LT |
86 | static int add_del_if(struct net_bridge *br, int ifindex, int isadd) |
87 | { | |
cb990503 | 88 | struct net *net = dev_net(br->dev); |
1da177e4 LT |
89 | struct net_device *dev; |
90 | int ret; | |
91 | ||
cb990503 | 92 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
93 | return -EPERM; |
94 | ||
cb990503 | 95 | dev = __dev_get_by_index(net, ifindex); |
1da177e4 LT |
96 | if (dev == NULL) |
97 | return -EINVAL; | |
9d6f229f | 98 | |
1da177e4 LT |
99 | if (isadd) |
100 | ret = br_add_if(br, dev); | |
101 | else | |
102 | ret = br_del_if(br, dev); | |
103 | ||
1da177e4 LT |
104 | return ret; |
105 | } | |
106 | ||
107 | /* | |
108 | * Legacy ioctl's through SIOCDEVPRIVATE | |
109 | * This interface is deprecated because it was too difficult to | |
25985edc | 110 | * to do the translation for 32/64bit ioctl compatibility. |
1da177e4 LT |
111 | */ |
112 | static 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]; | |
9d6f229f | 116 | |
1da177e4 LT |
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; | |
9cde0708 SH |
143 | |
144 | b.stp_enabled = (br->stp_enabled != BR_NO_STP); | |
1da177e4 LT |
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); | |
9d6f229f | 150 | rcu_read_unlock(); |
1da177e4 LT |
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 | ||
0da974f4 | 170 | indices = kcalloc(num, sizeof(int), GFP_KERNEL); |
1da177e4 LT |
171 | if (indices == NULL) |
172 | return -ENOMEM; | |
173 | ||
1da177e4 LT |
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: | |
cb990503 | 182 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
183 | return -EPERM; |
184 | ||
14f98f25 | 185 | return br_set_forward_delay(br, args[1]); |
1da177e4 LT |
186 | |
187 | case BRCTL_SET_BRIDGE_HELLO_TIME: | |
cb990503 | 188 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
189 | return -EPERM; |
190 | ||
14f98f25 | 191 | return br_set_hello_time(br, args[1]); |
1da177e4 LT |
192 | |
193 | case BRCTL_SET_BRIDGE_MAX_AGE: | |
cb990503 | 194 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
195 | return -EPERM; |
196 | ||
14f98f25 | 197 | return br_set_max_age(br, args[1]); |
1da177e4 LT |
198 | |
199 | case BRCTL_SET_AGEING_TIME: | |
cb990503 | 200 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
201 | return -EPERM; |
202 | ||
c62987bb | 203 | return br_set_ageing_time(br, args[1]); |
1da177e4 LT |
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: | |
cb990503 | 239 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
240 | return -EPERM; |
241 | ||
9cde0708 | 242 | br_stp_set_enabled(br, args[1]); |
1da177e4 LT |
243 | return 0; |
244 | ||
245 | case BRCTL_SET_BRIDGE_PRIORITY: | |
cb990503 | 246 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
247 | return -EPERM; |
248 | ||
1da177e4 | 249 | br_stp_set_bridge_priority(br, args[1]); |
1da177e4 LT |
250 | return 0; |
251 | ||
252 | case BRCTL_SET_PORT_PRIORITY: | |
253 | { | |
254 | struct net_bridge_port *p; | |
14f98f25 | 255 | int ret; |
1da177e4 | 256 | |
cb990503 | 257 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
258 | return -EPERM; |
259 | ||
1da177e4 | 260 | spin_lock_bh(&br->lock); |
9d6f229f | 261 | if ((p = br_get_port(br, args[1])) == NULL) |
1da177e4 LT |
262 | ret = -EINVAL; |
263 | else | |
14f98f25 | 264 | ret = br_stp_set_port_priority(p, args[2]); |
1da177e4 LT |
265 | spin_unlock_bh(&br->lock); |
266 | return ret; | |
267 | } | |
268 | ||
269 | case BRCTL_SET_PATH_COST: | |
270 | { | |
271 | struct net_bridge_port *p; | |
14f98f25 | 272 | int ret; |
1da177e4 | 273 | |
cb990503 | 274 | if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
275 | return -EPERM; |
276 | ||
14f98f25 | 277 | spin_lock_bh(&br->lock); |
1da177e4 LT |
278 | if ((p = br_get_port(br, args[1])) == NULL) |
279 | ret = -EINVAL; | |
280 | else | |
14f98f25 | 281 | ret = br_stp_set_path_cost(p, args[2]); |
282 | spin_unlock_bh(&br->lock); | |
6548cda2 | 283 | |
1da177e4 LT |
284 | return ret; |
285 | } | |
286 | ||
287 | case BRCTL_GET_FDB_ENTRIES: | |
9d6f229f | 288 | return get_fdb_entries(br, (void __user *)args[1], |
1da177e4 LT |
289 | args[2], args[3]); |
290 | } | |
291 | ||
292 | return -EOPNOTSUPP; | |
293 | } | |
294 | ||
4aa678ba | 295 | static int old_deviceless(struct net *net, void __user *uarg) |
1da177e4 LT |
296 | { |
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; | |
0da974f4 | 313 | indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); |
1da177e4 LT |
314 | if (indices == NULL) |
315 | return -ENOMEM; | |
316 | ||
4aa678ba | 317 | args[2] = get_bridge_ifindices(net, indices, args[2]); |
1da177e4 LT |
318 | |
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 | ||
cb990503 | 331 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
332 | 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) | |
4aa678ba | 340 | return br_add_bridge(net, buf); |
1da177e4 | 341 | |
4aa678ba | 342 | return br_del_bridge(net, buf); |
1da177e4 LT |
343 | } |
344 | } | |
345 | ||
346 | return -EOPNOTSUPP; | |
347 | } | |
348 | ||
881d966b | 349 | int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg) |
1da177e4 LT |
350 | { |
351 | switch (cmd) { | |
352 | case SIOCGIFBR: | |
353 | case SIOCSIFBR: | |
4aa678ba | 354 | return old_deviceless(net, uarg); |
9d6f229f | 355 | |
1da177e4 LT |
356 | case SIOCBRADDBR: |
357 | case SIOCBRDELBR: | |
358 | { | |
359 | char buf[IFNAMSIZ]; | |
360 | ||
cb990503 | 361 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
362 | return -EPERM; |
363 | ||
364 | if (copy_from_user(buf, uarg, IFNAMSIZ)) | |
365 | return -EFAULT; | |
366 | ||
367 | buf[IFNAMSIZ-1] = 0; | |
368 | if (cmd == SIOCBRADDBR) | |
4aa678ba | 369 | return br_add_bridge(net, buf); |
1da177e4 | 370 | |
4aa678ba | 371 | return br_del_bridge(net, buf); |
1da177e4 LT |
372 | } |
373 | } | |
374 | return -EOPNOTSUPP; | |
375 | } | |
376 | ||
377 | int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
378 | { | |
379 | struct net_bridge *br = netdev_priv(dev); | |
380 | ||
31a5b837 | 381 | switch (cmd) { |
1da177e4 LT |
382 | 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 | ||
28a16c97 | 391 | br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd); |
1da177e4 LT |
392 | return -EOPNOTSUPP; |
393 | } |