xref: /openbmc/linux/net/bridge/br_ioctl.c (revision 643d1f7f)
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 
16 #include <linux/capability.h>
17 #include <linux/kernel.h>
18 #include <linux/if_bridge.h>
19 #include <linux/netdevice.h>
20 #include <linux/times.h>
21 #include <net/net_namespace.h>
22 #include <asm/uaccess.h>
23 #include "br_private.h"
24 
25 /* called with RTNL */
26 static int get_bridge_ifindices(int *indices, int num)
27 {
28 	struct net_device *dev;
29 	int i = 0;
30 
31 	for_each_netdev(&init_net, dev) {
32 		if (i >= num)
33 			break;
34 		if (dev->priv_flags & IFF_EBRIDGE)
35 			indices[i++] = dev->ifindex;
36 	}
37 
38 	return i;
39 }
40 
41 /* called with RTNL */
42 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
43 {
44 	struct net_bridge_port *p;
45 
46 	list_for_each_entry(p, &br->port_list, list) {
47 		if (p->port_no < num)
48 			ifindices[p->port_no] = p->dev->ifindex;
49 	}
50 }
51 
52 /*
53  * Format up to a page worth of forwarding table entries
54  * userbuf -- where to copy result
55  * maxnum  -- maximum number of entries desired
56  *            (limited to a page for sanity)
57  * offset  -- number of records to skip
58  */
59 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
60 			   unsigned long maxnum, unsigned long offset)
61 {
62 	int num;
63 	void *buf;
64 	size_t size;
65 
66 	/* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
67 	if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
68 		maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
69 
70 	size = maxnum * sizeof(struct __fdb_entry);
71 
72 	buf = kmalloc(size, GFP_USER);
73 	if (!buf)
74 		return -ENOMEM;
75 
76 	num = br_fdb_fillbuf(br, buf, maxnum, offset);
77 	if (num > 0) {
78 		if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
79 			num = -EFAULT;
80 	}
81 	kfree(buf);
82 
83 	return num;
84 }
85 
86 static 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(&init_net, 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 	dev_put(dev);
104 	return ret;
105 }
106 
107 /*
108  * Legacy ioctl's through SIOCDEVPRIVATE
109  * This interface is deprecated because it was too difficult to
110  * to do the translation for 32/64bit ioctl compatability.
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];
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 (!capable(CAP_NET_ADMIN))
183 			return -EPERM;
184 
185 		spin_lock_bh(&br->lock);
186 		br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
187 		if (br_is_root_bridge(br))
188 			br->forward_delay = br->bridge_forward_delay;
189 		spin_unlock_bh(&br->lock);
190 		return 0;
191 
192 	case BRCTL_SET_BRIDGE_HELLO_TIME:
193 		if (!capable(CAP_NET_ADMIN))
194 			return -EPERM;
195 
196 		spin_lock_bh(&br->lock);
197 		br->bridge_hello_time = clock_t_to_jiffies(args[1]);
198 		if (br_is_root_bridge(br))
199 			br->hello_time = br->bridge_hello_time;
200 		spin_unlock_bh(&br->lock);
201 		return 0;
202 
203 	case BRCTL_SET_BRIDGE_MAX_AGE:
204 		if (!capable(CAP_NET_ADMIN))
205 			return -EPERM;
206 
207 		spin_lock_bh(&br->lock);
208 		br->bridge_max_age = clock_t_to_jiffies(args[1]);
209 		if (br_is_root_bridge(br))
210 			br->max_age = br->bridge_max_age;
211 		spin_unlock_bh(&br->lock);
212 		return 0;
213 
214 	case BRCTL_SET_AGEING_TIME:
215 		if (!capable(CAP_NET_ADMIN))
216 			return -EPERM;
217 
218 		br->ageing_time = clock_t_to_jiffies(args[1]);
219 		return 0;
220 
221 	case BRCTL_GET_PORT_INFO:
222 	{
223 		struct __port_info p;
224 		struct net_bridge_port *pt;
225 
226 		rcu_read_lock();
227 		if ((pt = br_get_port(br, args[2])) == NULL) {
228 			rcu_read_unlock();
229 			return -EINVAL;
230 		}
231 
232 		memset(&p, 0, sizeof(struct __port_info));
233 		memcpy(&p.designated_root, &pt->designated_root, 8);
234 		memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
235 		p.port_id = pt->port_id;
236 		p.designated_port = pt->designated_port;
237 		p.path_cost = pt->path_cost;
238 		p.designated_cost = pt->designated_cost;
239 		p.state = pt->state;
240 		p.top_change_ack = pt->topology_change_ack;
241 		p.config_pending = pt->config_pending;
242 		p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
243 		p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
244 		p.hold_timer_value = br_timer_value(&pt->hold_timer);
245 
246 		rcu_read_unlock();
247 
248 		if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
249 			return -EFAULT;
250 
251 		return 0;
252 	}
253 
254 	case BRCTL_SET_BRIDGE_STP_STATE:
255 		if (!capable(CAP_NET_ADMIN))
256 			return -EPERM;
257 
258 		br_stp_set_enabled(br, args[1]);
259 		return 0;
260 
261 	case BRCTL_SET_BRIDGE_PRIORITY:
262 		if (!capable(CAP_NET_ADMIN))
263 			return -EPERM;
264 
265 		spin_lock_bh(&br->lock);
266 		br_stp_set_bridge_priority(br, args[1]);
267 		spin_unlock_bh(&br->lock);
268 		return 0;
269 
270 	case BRCTL_SET_PORT_PRIORITY:
271 	{
272 		struct net_bridge_port *p;
273 		int ret = 0;
274 
275 		if (!capable(CAP_NET_ADMIN))
276 			return -EPERM;
277 
278 		if (args[2] >= (1<<(16-BR_PORT_BITS)))
279 			return -ERANGE;
280 
281 		spin_lock_bh(&br->lock);
282 		if ((p = br_get_port(br, args[1])) == NULL)
283 			ret = -EINVAL;
284 		else
285 			br_stp_set_port_priority(p, args[2]);
286 		spin_unlock_bh(&br->lock);
287 		return ret;
288 	}
289 
290 	case BRCTL_SET_PATH_COST:
291 	{
292 		struct net_bridge_port *p;
293 		int ret = 0;
294 
295 		if (!capable(CAP_NET_ADMIN))
296 			return -EPERM;
297 
298 		if ((p = br_get_port(br, args[1])) == NULL)
299 			ret = -EINVAL;
300 		else
301 			br_stp_set_path_cost(p, args[2]);
302 
303 		return ret;
304 	}
305 
306 	case BRCTL_GET_FDB_ENTRIES:
307 		return get_fdb_entries(br, (void __user *)args[1],
308 				       args[2], args[3]);
309 	}
310 
311 	return -EOPNOTSUPP;
312 }
313 
314 static int old_deviceless(void __user *uarg)
315 {
316 	unsigned long args[3];
317 
318 	if (copy_from_user(args, uarg, sizeof(args)))
319 		return -EFAULT;
320 
321 	switch (args[0]) {
322 	case BRCTL_GET_VERSION:
323 		return BRCTL_VERSION;
324 
325 	case BRCTL_GET_BRIDGES:
326 	{
327 		int *indices;
328 		int ret = 0;
329 
330 		if (args[2] >= 2048)
331 			return -ENOMEM;
332 		indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
333 		if (indices == NULL)
334 			return -ENOMEM;
335 
336 		args[2] = get_bridge_ifindices(indices, args[2]);
337 
338 		ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
339 			? -EFAULT : args[2];
340 
341 		kfree(indices);
342 		return ret;
343 	}
344 
345 	case BRCTL_ADD_BRIDGE:
346 	case BRCTL_DEL_BRIDGE:
347 	{
348 		char buf[IFNAMSIZ];
349 
350 		if (!capable(CAP_NET_ADMIN))
351 			return -EPERM;
352 
353 		if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
354 			return -EFAULT;
355 
356 		buf[IFNAMSIZ-1] = 0;
357 
358 		if (args[0] == BRCTL_ADD_BRIDGE)
359 			return br_add_bridge(buf);
360 
361 		return br_del_bridge(buf);
362 	}
363 	}
364 
365 	return -EOPNOTSUPP;
366 }
367 
368 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
369 {
370 	switch (cmd) {
371 	case SIOCGIFBR:
372 	case SIOCSIFBR:
373 		return old_deviceless(uarg);
374 
375 	case SIOCBRADDBR:
376 	case SIOCBRDELBR:
377 	{
378 		char buf[IFNAMSIZ];
379 
380 		if (!capable(CAP_NET_ADMIN))
381 			return -EPERM;
382 
383 		if (copy_from_user(buf, uarg, IFNAMSIZ))
384 			return -EFAULT;
385 
386 		buf[IFNAMSIZ-1] = 0;
387 		if (cmd == SIOCBRADDBR)
388 			return br_add_bridge(buf);
389 
390 		return br_del_bridge(buf);
391 	}
392 	}
393 	return -EOPNOTSUPP;
394 }
395 
396 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
397 {
398 	struct net_bridge *br = netdev_priv(dev);
399 
400 	switch(cmd) {
401 	case SIOCDEVPRIVATE:
402 		return old_dev_ioctl(dev, rq, cmd);
403 
404 	case SIOCBRADDIF:
405 	case SIOCBRDELIF:
406 		return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
407 
408 	}
409 
410 	pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
411 	return -EOPNOTSUPP;
412 }
413