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1da177e4 LT |
1 | /* |
2 | * Ioctl handler | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
8 | * $Id: br_ioctl.c,v 1.4 2000/11/08 05:16:40 davem Exp $ | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
4fc268d2 | 16 | #include <linux/capability.h> |
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/if_bridge.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/times.h> | |
21 | #include <asm/uaccess.h> | |
22 | #include "br_private.h" | |
23 | ||
24 | /* called with RTNL */ | |
25 | static int get_bridge_ifindices(int *indices, int num) | |
26 | { | |
27 | struct net_device *dev; | |
28 | int i = 0; | |
29 | ||
30 | for (dev = dev_base; dev && i < num; dev = dev->next) { | |
31 | if (dev->priv_flags & IFF_EBRIDGE) | |
32 | indices[i++] = dev->ifindex; | |
33 | } | |
34 | ||
35 | return i; | |
36 | } | |
37 | ||
38 | /* called with RTNL */ | |
39 | static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num) | |
40 | { | |
41 | struct net_bridge_port *p; | |
42 | ||
43 | list_for_each_entry(p, &br->port_list, list) { | |
44 | if (p->port_no < num) | |
45 | ifindices[p->port_no] = p->dev->ifindex; | |
46 | } | |
47 | } | |
48 | ||
49 | /* | |
50 | * Format up to a page worth of forwarding table entries | |
51 | * userbuf -- where to copy result | |
52 | * maxnum -- maximum number of entries desired | |
53 | * (limited to a page for sanity) | |
54 | * offset -- number of records to skip | |
55 | */ | |
56 | static int get_fdb_entries(struct net_bridge *br, void __user *userbuf, | |
57 | unsigned long maxnum, unsigned long offset) | |
58 | { | |
59 | int num; | |
60 | void *buf; | |
ba8379b2 | 61 | size_t size; |
1da177e4 | 62 | |
ba8379b2 CW |
63 | /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */ |
64 | if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry)) | |
1da177e4 | 65 | maxnum = PAGE_SIZE/sizeof(struct __fdb_entry); |
ba8379b2 CW |
66 | |
67 | size = maxnum * sizeof(struct __fdb_entry); | |
1da177e4 LT |
68 | |
69 | buf = kmalloc(size, GFP_USER); | |
70 | if (!buf) | |
71 | return -ENOMEM; | |
72 | ||
73 | num = br_fdb_fillbuf(br, buf, maxnum, offset); | |
74 | if (num > 0) { | |
75 | if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry))) | |
76 | num = -EFAULT; | |
77 | } | |
78 | kfree(buf); | |
79 | ||
80 | return num; | |
81 | } | |
82 | ||
83 | static int add_del_if(struct net_bridge *br, int ifindex, int isadd) | |
84 | { | |
85 | struct net_device *dev; | |
86 | int ret; | |
87 | ||
88 | if (!capable(CAP_NET_ADMIN)) | |
89 | return -EPERM; | |
90 | ||
91 | dev = dev_get_by_index(ifindex); | |
92 | if (dev == NULL) | |
93 | return -EINVAL; | |
94 | ||
95 | if (isadd) | |
96 | ret = br_add_if(br, dev); | |
97 | else | |
98 | ret = br_del_if(br, dev); | |
99 | ||
100 | dev_put(dev); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Legacy ioctl's through SIOCDEVPRIVATE | |
106 | * This interface is deprecated because it was too difficult to | |
107 | * to do the translation for 32/64bit ioctl compatability. | |
108 | */ | |
109 | static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
110 | { | |
111 | struct net_bridge *br = netdev_priv(dev); | |
112 | unsigned long args[4]; | |
113 | ||
114 | if (copy_from_user(args, rq->ifr_data, sizeof(args))) | |
115 | return -EFAULT; | |
116 | ||
117 | switch (args[0]) { | |
118 | case BRCTL_ADD_IF: | |
119 | case BRCTL_DEL_IF: | |
120 | return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF); | |
121 | ||
122 | case BRCTL_GET_BRIDGE_INFO: | |
123 | { | |
124 | struct __bridge_info b; | |
125 | ||
126 | memset(&b, 0, sizeof(struct __bridge_info)); | |
127 | rcu_read_lock(); | |
128 | memcpy(&b.designated_root, &br->designated_root, 8); | |
129 | memcpy(&b.bridge_id, &br->bridge_id, 8); | |
130 | b.root_path_cost = br->root_path_cost; | |
131 | b.max_age = jiffies_to_clock_t(br->max_age); | |
132 | b.hello_time = jiffies_to_clock_t(br->hello_time); | |
133 | b.forward_delay = br->forward_delay; | |
134 | b.bridge_max_age = br->bridge_max_age; | |
135 | b.bridge_hello_time = br->bridge_hello_time; | |
136 | b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay); | |
137 | b.topology_change = br->topology_change; | |
138 | b.topology_change_detected = br->topology_change_detected; | |
139 | b.root_port = br->root_port; | |
140 | b.stp_enabled = br->stp_enabled; | |
141 | b.ageing_time = jiffies_to_clock_t(br->ageing_time); | |
142 | b.hello_timer_value = br_timer_value(&br->hello_timer); | |
143 | b.tcn_timer_value = br_timer_value(&br->tcn_timer); | |
144 | b.topology_change_timer_value = br_timer_value(&br->topology_change_timer); | |
145 | b.gc_timer_value = br_timer_value(&br->gc_timer); | |
146 | rcu_read_unlock(); | |
147 | ||
148 | if (copy_to_user((void __user *)args[1], &b, sizeof(b))) | |
149 | return -EFAULT; | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | case BRCTL_GET_PORT_LIST: | |
155 | { | |
156 | int num, *indices; | |
157 | ||
158 | num = args[2]; | |
159 | if (num < 0) | |
160 | return -EINVAL; | |
161 | if (num == 0) | |
162 | num = 256; | |
163 | if (num > BR_MAX_PORTS) | |
164 | num = BR_MAX_PORTS; | |
165 | ||
0da974f4 | 166 | indices = kcalloc(num, sizeof(int), GFP_KERNEL); |
1da177e4 LT |
167 | if (indices == NULL) |
168 | return -ENOMEM; | |
169 | ||
1da177e4 LT |
170 | get_port_ifindices(br, indices, num); |
171 | if (copy_to_user((void __user *)args[1], indices, num*sizeof(int))) | |
172 | num = -EFAULT; | |
173 | kfree(indices); | |
174 | return num; | |
175 | } | |
176 | ||
177 | case BRCTL_SET_BRIDGE_FORWARD_DELAY: | |
178 | if (!capable(CAP_NET_ADMIN)) | |
179 | return -EPERM; | |
180 | ||
181 | spin_lock_bh(&br->lock); | |
182 | br->bridge_forward_delay = clock_t_to_jiffies(args[1]); | |
183 | if (br_is_root_bridge(br)) | |
184 | br->forward_delay = br->bridge_forward_delay; | |
185 | spin_unlock_bh(&br->lock); | |
186 | return 0; | |
187 | ||
188 | case BRCTL_SET_BRIDGE_HELLO_TIME: | |
189 | if (!capable(CAP_NET_ADMIN)) | |
190 | return -EPERM; | |
191 | ||
192 | spin_lock_bh(&br->lock); | |
193 | br->bridge_hello_time = clock_t_to_jiffies(args[1]); | |
194 | if (br_is_root_bridge(br)) | |
195 | br->hello_time = br->bridge_hello_time; | |
196 | spin_unlock_bh(&br->lock); | |
197 | return 0; | |
198 | ||
199 | case BRCTL_SET_BRIDGE_MAX_AGE: | |
200 | if (!capable(CAP_NET_ADMIN)) | |
201 | return -EPERM; | |
202 | ||
203 | spin_lock_bh(&br->lock); | |
204 | br->bridge_max_age = clock_t_to_jiffies(args[1]); | |
205 | if (br_is_root_bridge(br)) | |
206 | br->max_age = br->bridge_max_age; | |
207 | spin_unlock_bh(&br->lock); | |
208 | return 0; | |
209 | ||
210 | case BRCTL_SET_AGEING_TIME: | |
211 | if (!capable(CAP_NET_ADMIN)) | |
212 | return -EPERM; | |
213 | ||
214 | br->ageing_time = clock_t_to_jiffies(args[1]); | |
215 | return 0; | |
216 | ||
217 | case BRCTL_GET_PORT_INFO: | |
218 | { | |
219 | struct __port_info p; | |
220 | struct net_bridge_port *pt; | |
221 | ||
222 | rcu_read_lock(); | |
223 | if ((pt = br_get_port(br, args[2])) == NULL) { | |
224 | rcu_read_unlock(); | |
225 | return -EINVAL; | |
226 | } | |
227 | ||
228 | memset(&p, 0, sizeof(struct __port_info)); | |
229 | memcpy(&p.designated_root, &pt->designated_root, 8); | |
230 | memcpy(&p.designated_bridge, &pt->designated_bridge, 8); | |
231 | p.port_id = pt->port_id; | |
232 | p.designated_port = pt->designated_port; | |
233 | p.path_cost = pt->path_cost; | |
234 | p.designated_cost = pt->designated_cost; | |
235 | p.state = pt->state; | |
236 | p.top_change_ack = pt->topology_change_ack; | |
237 | p.config_pending = pt->config_pending; | |
238 | p.message_age_timer_value = br_timer_value(&pt->message_age_timer); | |
239 | p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer); | |
240 | p.hold_timer_value = br_timer_value(&pt->hold_timer); | |
241 | ||
242 | rcu_read_unlock(); | |
243 | ||
244 | if (copy_to_user((void __user *)args[1], &p, sizeof(p))) | |
245 | return -EFAULT; | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | case BRCTL_SET_BRIDGE_STP_STATE: | |
251 | if (!capable(CAP_NET_ADMIN)) | |
252 | return -EPERM; | |
253 | ||
254 | br->stp_enabled = args[1]?1:0; | |
255 | return 0; | |
256 | ||
257 | case BRCTL_SET_BRIDGE_PRIORITY: | |
258 | if (!capable(CAP_NET_ADMIN)) | |
259 | return -EPERM; | |
260 | ||
261 | spin_lock_bh(&br->lock); | |
262 | br_stp_set_bridge_priority(br, args[1]); | |
263 | spin_unlock_bh(&br->lock); | |
264 | return 0; | |
265 | ||
266 | case BRCTL_SET_PORT_PRIORITY: | |
267 | { | |
268 | struct net_bridge_port *p; | |
269 | int ret = 0; | |
270 | ||
271 | if (!capable(CAP_NET_ADMIN)) | |
272 | return -EPERM; | |
273 | ||
274 | if (args[2] >= (1<<(16-BR_PORT_BITS))) | |
275 | return -ERANGE; | |
276 | ||
277 | spin_lock_bh(&br->lock); | |
278 | if ((p = br_get_port(br, args[1])) == NULL) | |
279 | ret = -EINVAL; | |
280 | else | |
281 | br_stp_set_port_priority(p, args[2]); | |
282 | spin_unlock_bh(&br->lock); | |
283 | return ret; | |
284 | } | |
285 | ||
286 | case BRCTL_SET_PATH_COST: | |
287 | { | |
288 | struct net_bridge_port *p; | |
289 | int ret = 0; | |
290 | ||
291 | if (!capable(CAP_NET_ADMIN)) | |
292 | return -EPERM; | |
293 | ||
294 | spin_lock_bh(&br->lock); | |
295 | if ((p = br_get_port(br, args[1])) == NULL) | |
296 | ret = -EINVAL; | |
297 | else | |
298 | br_stp_set_path_cost(p, args[2]); | |
299 | spin_unlock_bh(&br->lock); | |
300 | return ret; | |
301 | } | |
302 | ||
303 | case BRCTL_GET_FDB_ENTRIES: | |
304 | return get_fdb_entries(br, (void __user *)args[1], | |
305 | args[2], args[3]); | |
306 | } | |
307 | ||
308 | return -EOPNOTSUPP; | |
309 | } | |
310 | ||
311 | static int old_deviceless(void __user *uarg) | |
312 | { | |
313 | unsigned long args[3]; | |
314 | ||
315 | if (copy_from_user(args, uarg, sizeof(args))) | |
316 | return -EFAULT; | |
317 | ||
318 | switch (args[0]) { | |
319 | case BRCTL_GET_VERSION: | |
320 | return BRCTL_VERSION; | |
321 | ||
322 | case BRCTL_GET_BRIDGES: | |
323 | { | |
324 | int *indices; | |
325 | int ret = 0; | |
326 | ||
327 | if (args[2] >= 2048) | |
328 | return -ENOMEM; | |
0da974f4 | 329 | indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); |
1da177e4 LT |
330 | if (indices == NULL) |
331 | return -ENOMEM; | |
332 | ||
1da177e4 LT |
333 | args[2] = get_bridge_ifindices(indices, args[2]); |
334 | ||
335 | ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int)) | |
336 | ? -EFAULT : args[2]; | |
337 | ||
338 | kfree(indices); | |
339 | return ret; | |
340 | } | |
341 | ||
342 | case BRCTL_ADD_BRIDGE: | |
343 | case BRCTL_DEL_BRIDGE: | |
344 | { | |
345 | char buf[IFNAMSIZ]; | |
346 | ||
347 | if (!capable(CAP_NET_ADMIN)) | |
348 | return -EPERM; | |
349 | ||
350 | if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) | |
351 | return -EFAULT; | |
352 | ||
353 | buf[IFNAMSIZ-1] = 0; | |
354 | ||
355 | if (args[0] == BRCTL_ADD_BRIDGE) | |
356 | return br_add_bridge(buf); | |
357 | ||
358 | return br_del_bridge(buf); | |
359 | } | |
360 | } | |
361 | ||
362 | return -EOPNOTSUPP; | |
363 | } | |
364 | ||
365 | int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg) | |
366 | { | |
367 | switch (cmd) { | |
368 | case SIOCGIFBR: | |
369 | case SIOCSIFBR: | |
370 | return old_deviceless(uarg); | |
371 | ||
372 | case SIOCBRADDBR: | |
373 | case SIOCBRDELBR: | |
374 | { | |
375 | char buf[IFNAMSIZ]; | |
376 | ||
377 | if (!capable(CAP_NET_ADMIN)) | |
378 | return -EPERM; | |
379 | ||
380 | if (copy_from_user(buf, uarg, IFNAMSIZ)) | |
381 | return -EFAULT; | |
382 | ||
383 | buf[IFNAMSIZ-1] = 0; | |
384 | if (cmd == SIOCBRADDBR) | |
385 | return br_add_bridge(buf); | |
386 | ||
387 | return br_del_bridge(buf); | |
388 | } | |
389 | } | |
390 | return -EOPNOTSUPP; | |
391 | } | |
392 | ||
393 | int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) | |
394 | { | |
395 | struct net_bridge *br = netdev_priv(dev); | |
396 | ||
397 | switch(cmd) { | |
398 | case SIOCDEVPRIVATE: | |
399 | return old_dev_ioctl(dev, rq, cmd); | |
400 | ||
401 | case SIOCBRADDIF: | |
402 | case SIOCBRDELIF: | |
403 | return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF); | |
404 | ||
405 | } | |
406 | ||
407 | pr_debug("Bridge does not support ioctl 0x%x\n", cmd); | |
408 | return -EOPNOTSUPP; | |
409 | } |