[linux.git] / net / bridge / br_ioctl.c

/*
 *	Ioctl handler
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<[email protected]>
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/if_bridge.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/times.h>
#include <net/net_namespace.h>
#include <asm/uaccess.h>
#include "br_private.h"

/* called with RTNL */
static int get_bridge_ifindices(struct net *net, int *indices, int num)
{
	struct net_device *dev;
	int i = 0;

	for_each_netdev(net, dev) {
		if (i >= num)
			break;
		if (dev->priv_flags & IFF_EBRIDGE)
			indices[i++] = dev->ifindex;
	}

	return i;
}

/* called with RTNL */
static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
{
	struct net_bridge_port *p;

	list_for_each_entry(p, &br->port_list, list) {
		if (p->port_no < num)
			ifindices[p->port_no] = p->dev->ifindex;
	}
}

/*
 * Format up to a page worth of forwarding table entries
 * userbuf -- where to copy result
 * maxnum  -- maximum number of entries desired
 *            (limited to a page for sanity)
 * offset  -- number of records to skip
 */
static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
			   unsigned long maxnum, unsigned long offset)
{
	int num;
	void *buf;
	size_t size;

	/* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
	if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
		maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);

	size = maxnum * sizeof(struct __fdb_entry);

	buf = kmalloc(size, GFP_USER);
	if (!buf)
		return -ENOMEM;

	num = br_fdb_fillbuf(br, buf, maxnum, offset);
	if (num > 0) {
		if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
			num = -EFAULT;
	}
	kfree(buf);

	return num;
}

/* called with RTNL */
static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
{
	struct net *net = dev_net(br->dev);
	struct net_device *dev;
	int ret;

	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
		return -EPERM;

	dev = __dev_get_by_index(net, ifindex);
	if (dev == NULL)
		return -EINVAL;

	if (isadd)
		ret = br_add_if(br, dev);
	else
		ret = br_del_if(br, dev);

	return ret;
}

/*
 * Legacy ioctl's through SIOCDEVPRIVATE
 * This interface is deprecated because it was too difficult to
 * to do the translation for 32/64bit ioctl compatibility.
 */
static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct net_bridge *br = netdev_priv(dev);
	unsigned long args[4];

	if (copy_from_user(args, rq->ifr_data, sizeof(args)))
		return -EFAULT;

	switch (args[0]) {
	case BRCTL_ADD_IF:
	case BRCTL_DEL_IF:
		return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);

	case BRCTL_GET_BRIDGE_INFO:
	{
		struct __bridge_info b;

		memset(&b, 0, sizeof(struct __bridge_info));
		rcu_read_lock();
		memcpy(&b.designated_root, &br->designated_root, 8);
		memcpy(&b.bridge_id, &br->bridge_id, 8);
		b.root_path_cost = br->root_path_cost;
		b.max_age = jiffies_to_clock_t(br->max_age);
		b.hello_time = jiffies_to_clock_t(br->hello_time);
		b.forward_delay = br->forward_delay;
		b.bridge_max_age = br->bridge_max_age;
		b.bridge_hello_time = br->bridge_hello_time;
		b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
		b.topology_change = br->topology_change;
		b.topology_change_detected = br->topology_change_detected;
		b.root_port = br->root_port;

		b.stp_enabled = (br->stp_enabled != BR_NO_STP);
		b.ageing_time = jiffies_to_clock_t(br->ageing_time);
		b.hello_timer_value = br_timer_value(&br->hello_timer);
		b.tcn_timer_value = br_timer_value(&br->tcn_timer);
		b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
		b.gc_timer_value = br_timer_value(&br->gc_timer);
		rcu_read_unlock();

		if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
			return -EFAULT;

		return 0;
	}

	case BRCTL_GET_PORT_LIST:
	{
		int num, *indices;

		num = args[2];
		if (num < 0)
			return -EINVAL;
		if (num == 0)
			num = 256;
		if (num > BR_MAX_PORTS)
			num = BR_MAX_PORTS;

		indices = kcalloc(num, sizeof(int), GFP_KERNEL);
		if (indices == NULL)
			return -ENOMEM;

		get_port_ifindices(br, indices, num);
		if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
			num =  -EFAULT;
		kfree(indices);
		return num;
	}

	case BRCTL_SET_BRIDGE_FORWARD_DELAY:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		return br_set_forward_delay(br, args[1]);

	case BRCTL_SET_BRIDGE_HELLO_TIME:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		return br_set_hello_time(br, args[1]);

	case BRCTL_SET_BRIDGE_MAX_AGE:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		return br_set_max_age(br, args[1]);

	case BRCTL_SET_AGEING_TIME:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		br->ageing_time = clock_t_to_jiffies(args[1]);
		return 0;

	case BRCTL_GET_PORT_INFO:
	{
		struct __port_info p;
		struct net_bridge_port *pt;

		rcu_read_lock();
		if ((pt = br_get_port(br, args[2])) == NULL) {
			rcu_read_unlock();
			return -EINVAL;
		}

		memset(&p, 0, sizeof(struct __port_info));
		memcpy(&p.designated_root, &pt->designated_root, 8);
		memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
		p.port_id = pt->port_id;
		p.designated_port = pt->designated_port;
		p.path_cost = pt->path_cost;
		p.designated_cost = pt->designated_cost;
		p.state = pt->state;
		p.top_change_ack = pt->topology_change_ack;
		p.config_pending = pt->config_pending;
		p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
		p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
		p.hold_timer_value = br_timer_value(&pt->hold_timer);

		rcu_read_unlock();

		if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
			return -EFAULT;

		return 0;
	}

	case BRCTL_SET_BRIDGE_STP_STATE:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		br_stp_set_enabled(br, args[1]);
		return 0;

	case BRCTL_SET_BRIDGE_PRIORITY:
		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		spin_lock_bh(&br->lock);
		br_stp_set_bridge_priority(br, args[1]);
		spin_unlock_bh(&br->lock);
		return 0;

	case BRCTL_SET_PORT_PRIORITY:
	{
		struct net_bridge_port *p;
		int ret;

		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		spin_lock_bh(&br->lock);
		if ((p = br_get_port(br, args[1])) == NULL)
			ret = -EINVAL;
		else
			ret = br_stp_set_port_priority(p, args[2]);
		spin_unlock_bh(&br->lock);
		return ret;
	}

	case BRCTL_SET_PATH_COST:
	{
		struct net_bridge_port *p;
		int ret;

		if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		spin_lock_bh(&br->lock);
		if ((p = br_get_port(br, args[1])) == NULL)
			ret = -EINVAL;
		else
			ret = br_stp_set_path_cost(p, args[2]);
		spin_unlock_bh(&br->lock);

		return ret;
	}

	case BRCTL_GET_FDB_ENTRIES:
		return get_fdb_entries(br, (void __user *)args[1],
				       args[2], args[3]);
	}

	return -EOPNOTSUPP;
}

static int old_deviceless(struct net *net, void __user *uarg)
{
	unsigned long args[3];

	if (copy_from_user(args, uarg, sizeof(args)))
		return -EFAULT;

	switch (args[0]) {
	case BRCTL_GET_VERSION:
		return BRCTL_VERSION;

	case BRCTL_GET_BRIDGES:
	{
		int *indices;
		int ret = 0;

		if (args[2] >= 2048)
			return -ENOMEM;
		indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
		if (indices == NULL)
			return -ENOMEM;

		args[2] = get_bridge_ifindices(net, indices, args[2]);

		ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
			? -EFAULT : args[2];

		kfree(indices);
		return ret;
	}

	case BRCTL_ADD_BRIDGE:
	case BRCTL_DEL_BRIDGE:
	{
		char buf[IFNAMSIZ];

		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
			return -EFAULT;

		buf[IFNAMSIZ-1] = 0;

		if (args[0] == BRCTL_ADD_BRIDGE)
			return br_add_bridge(net, buf);

		return br_del_bridge(net, buf);
	}
	}

	return -EOPNOTSUPP;
}

int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
{
	switch (cmd) {
	case SIOCGIFBR:
	case SIOCSIFBR:
		return old_deviceless(net, uarg);

	case SIOCBRADDBR:
	case SIOCBRDELBR:
	{
		char buf[IFNAMSIZ];

		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;

		if (copy_from_user(buf, uarg, IFNAMSIZ))
			return -EFAULT;

		buf[IFNAMSIZ-1] = 0;
		if (cmd == SIOCBRADDBR)
			return br_add_bridge(net, buf);

		return br_del_bridge(net, buf);
	}
	}
	return -EOPNOTSUPP;
}

int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct net_bridge *br = netdev_priv(dev);

	switch(cmd) {
	case SIOCDEVPRIVATE:
		return old_dev_ioctl(dev, rq, cmd);

	case SIOCBRADDIF:
	case SIOCBRDELIF:
		return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);

	}

	br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
	return -EOPNOTSUPP;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Ioctl handler
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <[email protected]>
	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)
7562f876 PE	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 */
ba8379b2 CW	66	if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
1da177e4	67	maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
ba8379b2 CW	68
ba8379b2 CW	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)
1da177e4 LT	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;
1da177e4 LT	94
cb990503	95	dev = __dev_get_by_index(net, ifindex);
1da177e4 LT	96	if (dev == NULL)
1da177e4 LT	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
9cde0708 SH	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, numsizeof(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;
1da177e4 LT	184
14f98f25	185	return br_set_forward_delay(br, args[1]);
1da177e4 LT	186
1da177e4 LT	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;
1da177e4 LT	190
14f98f25	191	return br_set_hello_time(br, args[1]);
1da177e4 LT	192
1da177e4 LT	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;
1da177e4 LT	196
14f98f25	197	return br_set_max_age(br, args[1]);
1da177e4 LT	198
1da177e4 LT	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
	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:
cb990503	240	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	241	return -EPERM;
1da177e4 LT	242
9cde0708	243	br_stp_set_enabled(br, args[1]);
1da177e4 LT	244	return 0;
	245
	246	case BRCTL_SET_BRIDGE_PRIORITY:
cb990503	247	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	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;
14f98f25	258	int ret;
1da177e4	259
cb990503	260	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	261	return -EPERM;
1da177e4 LT	262
1da177e4	263	spin_lock_bh(&br->lock);
9d6f229f	264	if ((p = br_get_port(br, args[1])) == NULL)
1da177e4 LT	265	ret = -EINVAL;
1da177e4 LT	266	else
14f98f25	267	ret = br_stp_set_port_priority(p, args[2]);
1da177e4 LT	268	spin_unlock_bh(&br->lock);
	269	return ret;
	270	}
	271
	272	case BRCTL_SET_PATH_COST:
	273	{
	274	struct net_bridge_port *p;
14f98f25	275	int ret;
1da177e4	276
cb990503	277	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	278	return -EPERM;
1da177e4 LT	279
14f98f25	280	spin_lock_bh(&br->lock);
1da177e4 LT	281	if ((p = br_get_port(br, args[1])) == NULL)
	282	ret = -EINVAL;
	283	else
14f98f25	284	ret = br_stp_set_path_cost(p, args[2]);
14f98f25	285	spin_unlock_bh(&br->lock);
6548cda2	286
1da177e4 LT	287	return ret;
	288	}
	289
	290	case BRCTL_GET_FDB_ENTRIES:
9d6f229f	291	return get_fdb_entries(br, (void __user *)args[1],
1da177e4 LT	292	args[2], args[3]);
	293	}
	294
	295	return -EOPNOTSUPP;
	296	}
	297
4aa678ba	298	static int old_deviceless(struct net net, void __user uarg)
1da177e4 LT	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;
0da974f4	316	indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
1da177e4 LT	317	if (indices == NULL)
	318	return -ENOMEM;
	319
4aa678ba	320	args[2] = get_bridge_ifindices(net, indices, args[2]);
1da177e4 LT	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
cb990503	334	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	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)
4aa678ba	343	return br_add_bridge(net, buf);
1da177e4	344
4aa678ba	345	return br_del_bridge(net, buf);
1da177e4 LT	346	}
	347	}
	348
	349	return -EOPNOTSUPP;
	350	}
	351
881d966b	352	int br_ioctl_deviceless_stub(struct net net, unsigned int cmd, void __user uarg)
1da177e4 LT	353	{
	354	switch (cmd) {
	355	case SIOCGIFBR:
	356	case SIOCSIFBR:
4aa678ba	357	return old_deviceless(net, uarg);
9d6f229f	358
1da177e4 LT	359	case SIOCBRADDBR:
	360	case SIOCBRDELBR:
	361	{
	362	char buf[IFNAMSIZ];
	363
cb990503	364	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	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)
4aa678ba	372	return br_add_bridge(net, buf);
1da177e4	373
4aa678ba	374	return br_del_bridge(net, buf);
1da177e4 LT	375	}
	376	}
	377	return -EOPNOTSUPP;
	378	}
	379
	380	int 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
28a16c97	394	br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
1da177e4 LT	395	return -EOPNOTSUPP;
1da177e4 LT	396	}