[mirror_ubuntu-hirsute-kernel.git] / net / bridge / br_ioctl.c

/*
 *	Ioctl handler
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	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"

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

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

	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;

		return br_set_ageing_time(br, args[1]);

	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;

		br_stp_set_bridge_priority(br, args[1]);
		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 <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
4aa678ba	24	static int get_bridge_ifindices(struct net net, int indices, int num)
1da177e4 LT	25	{
	26	struct net_device *dev;
	27	int i = 0;
	28
31ca0458 NA	29	rcu_read_lock();
31ca0458 NA	30	for_each_netdev_rcu(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;
1da177e4 LT	35	}
31ca0458	36	rcu_read_unlock();
1da177e4 LT	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	*/
9d6f229f	59	static int get_fdb_entries(struct net_bridge br, void __user userbuf,
1da177e4 LT	60	unsigned long maxnum, unsigned long offset)
	61	{
	62	int num;
	63	void *buf;
ba8379b2	64	size_t size;
1da177e4	65
ba8379b2 CW	66	/* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
ba8379b2 CW	67	if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
1da177e4	68	maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
ba8379b2 CW	69
ba8379b2 CW	70	size = maxnum * sizeof(struct __fdb_entry);
1da177e4 LT	71
	72	buf = kmalloc(size, GFP_USER);
	73	if (!buf)
	74	return -ENOMEM;
9d6f229f	75
1da177e4 LT	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
31ef30c7	86	/* called with RTNL */
1da177e4 LT	87	static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
1da177e4 LT	88	{
cb990503	89	struct net *net = dev_net(br->dev);
1da177e4 LT	90	struct net_device *dev;
	91	int ret;
	92
cb990503	93	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	94	return -EPERM;
1da177e4 LT	95
cb990503	96	dev = __dev_get_by_index(net, ifindex);
1da177e4 LT	97	if (dev == NULL)
1da177e4 LT	98	return -EINVAL;
9d6f229f	99
1da177e4 LT	100	if (isadd)
	101	ret = br_add_if(br, dev);
	102	else
	103	ret = br_del_if(br, dev);
	104
1da177e4 LT	105	return ret;
	106	}
	107
	108	/*
	109	* Legacy ioctl's through SIOCDEVPRIVATE
	110	* This interface is deprecated because it was too difficult to
25985edc	111	* to do the translation for 32/64bit ioctl compatibility.
1da177e4 LT	112	*/
	113	static int old_dev_ioctl(struct net_device dev, struct ifreq rq, int cmd)
	114	{
	115	struct net_bridge *br = netdev_priv(dev);
	116	unsigned long args[4];
9d6f229f	117
1da177e4 LT	118	if (copy_from_user(args, rq->ifr_data, sizeof(args)))
	119	return -EFAULT;
	120
	121	switch (args[0]) {
	122	case BRCTL_ADD_IF:
	123	case BRCTL_DEL_IF:
	124	return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
	125
	126	case BRCTL_GET_BRIDGE_INFO:
	127	{
	128	struct __bridge_info b;
	129
	130	memset(&b, 0, sizeof(struct __bridge_info));
	131	rcu_read_lock();
	132	memcpy(&b.designated_root, &br->designated_root, 8);
	133	memcpy(&b.bridge_id, &br->bridge_id, 8);
	134	b.root_path_cost = br->root_path_cost;
	135	b.max_age = jiffies_to_clock_t(br->max_age);
	136	b.hello_time = jiffies_to_clock_t(br->hello_time);
	137	b.forward_delay = br->forward_delay;
	138	b.bridge_max_age = br->bridge_max_age;
	139	b.bridge_hello_time = br->bridge_hello_time;
	140	b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
	141	b.topology_change = br->topology_change;
	142	b.topology_change_detected = br->topology_change_detected;
	143	b.root_port = br->root_port;
9cde0708 SH	144
9cde0708 SH	145	b.stp_enabled = (br->stp_enabled != BR_NO_STP);
1da177e4 LT	146	b.ageing_time = jiffies_to_clock_t(br->ageing_time);
	147	b.hello_timer_value = br_timer_value(&br->hello_timer);
	148	b.tcn_timer_value = br_timer_value(&br->tcn_timer);
	149	b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
	150	b.gc_timer_value = br_timer_value(&br->gc_timer);
9d6f229f	151	rcu_read_unlock();
1da177e4 LT	152
	153	if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
	154	return -EFAULT;
	155
	156	return 0;
	157	}
	158
	159	case BRCTL_GET_PORT_LIST:
	160	{
	161	int num, *indices;
	162
	163	num = args[2];
	164	if (num < 0)
	165	return -EINVAL;
	166	if (num == 0)
	167	num = 256;
	168	if (num > BR_MAX_PORTS)
	169	num = BR_MAX_PORTS;
	170
0da974f4	171	indices = kcalloc(num, sizeof(int), GFP_KERNEL);
1da177e4 LT	172	if (indices == NULL)
	173	return -ENOMEM;
	174
1da177e4 LT	175	get_port_ifindices(br, indices, num);
	176	if (copy_to_user((void __user )args[1], indices, numsizeof(int)))
	177	num = -EFAULT;
	178	kfree(indices);
	179	return num;
	180	}
	181
	182	case BRCTL_SET_BRIDGE_FORWARD_DELAY:
cb990503	183	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	184	return -EPERM;
1da177e4 LT	185
14f98f25	186	return br_set_forward_delay(br, args[1]);
1da177e4 LT	187
1da177e4 LT	188	case BRCTL_SET_BRIDGE_HELLO_TIME:
cb990503	189	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	190	return -EPERM;
1da177e4 LT	191
14f98f25	192	return br_set_hello_time(br, args[1]);
1da177e4 LT	193
1da177e4 LT	194	case BRCTL_SET_BRIDGE_MAX_AGE:
cb990503	195	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	196	return -EPERM;
1da177e4 LT	197
14f98f25	198	return br_set_max_age(br, args[1]);
1da177e4 LT	199
1da177e4 LT	200	case BRCTL_SET_AGEING_TIME:
cb990503	201	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	202	return -EPERM;
1da177e4 LT	203
c62987bb	204	return br_set_ageing_time(br, args[1]);
1da177e4 LT	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;
1da177e4 LT	249
1da177e4	250	br_stp_set_bridge_priority(br, args[1]);
1da177e4 LT	251	return 0;
	252
	253	case BRCTL_SET_PORT_PRIORITY:
	254	{
	255	struct net_bridge_port *p;
14f98f25	256	int ret;
1da177e4	257
cb990503	258	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	259	return -EPERM;
1da177e4 LT	260
1da177e4	261	spin_lock_bh(&br->lock);
9d6f229f	262	if ((p = br_get_port(br, args[1])) == NULL)
1da177e4 LT	263	ret = -EINVAL;
1da177e4 LT	264	else
14f98f25	265	ret = br_stp_set_port_priority(p, args[2]);
1da177e4 LT	266	spin_unlock_bh(&br->lock);
	267	return ret;
	268	}
	269
	270	case BRCTL_SET_PATH_COST:
	271	{
	272	struct net_bridge_port *p;
14f98f25	273	int ret;
1da177e4	274
cb990503	275	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	276	return -EPERM;
1da177e4 LT	277
14f98f25	278	spin_lock_bh(&br->lock);
1da177e4 LT	279	if ((p = br_get_port(br, args[1])) == NULL)
	280	ret = -EINVAL;
	281	else
14f98f25	282	ret = br_stp_set_path_cost(p, args[2]);
14f98f25	283	spin_unlock_bh(&br->lock);
6548cda2	284
1da177e4 LT	285	return ret;
	286	}
	287
	288	case BRCTL_GET_FDB_ENTRIES:
9d6f229f	289	return get_fdb_entries(br, (void __user *)args[1],
1da177e4 LT	290	args[2], args[3]);
	291	}
	292
	293	return -EOPNOTSUPP;
	294	}
	295
4aa678ba	296	static int old_deviceless(struct net net, void __user uarg)
1da177e4 LT	297	{
	298	unsigned long args[3];
	299
	300	if (copy_from_user(args, uarg, sizeof(args)))
	301	return -EFAULT;
	302
	303	switch (args[0]) {
	304	case BRCTL_GET_VERSION:
	305	return BRCTL_VERSION;
	306
	307	case BRCTL_GET_BRIDGES:
	308	{
	309	int *indices;
	310	int ret = 0;
	311
	312	if (args[2] >= 2048)
	313	return -ENOMEM;
0da974f4	314	indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
1da177e4 LT	315	if (indices == NULL)
	316	return -ENOMEM;
	317
4aa678ba	318	args[2] = get_bridge_ifindices(net, indices, args[2]);
1da177e4 LT	319
	320	ret = copy_to_user((void __user )args[1], indices, args[2]sizeof(int))
	321	? -EFAULT : args[2];
	322
	323	kfree(indices);
	324	return ret;
	325	}
	326
	327	case BRCTL_ADD_BRIDGE:
	328	case BRCTL_DEL_BRIDGE:
	329	{
	330	char buf[IFNAMSIZ];
	331
cb990503	332	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	333	return -EPERM;
	334
	335	if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
	336	return -EFAULT;
	337
	338	buf[IFNAMSIZ-1] = 0;
	339
	340	if (args[0] == BRCTL_ADD_BRIDGE)
4aa678ba	341	return br_add_bridge(net, buf);
1da177e4	342
4aa678ba	343	return br_del_bridge(net, buf);
1da177e4 LT	344	}
	345	}
	346
	347	return -EOPNOTSUPP;
	348	}
	349
881d966b	350	int br_ioctl_deviceless_stub(struct net net, unsigned int cmd, void __user uarg)
1da177e4 LT	351	{
	352	switch (cmd) {
	353	case SIOCGIFBR:
	354	case SIOCSIFBR:
4aa678ba	355	return old_deviceless(net, uarg);
9d6f229f	356
1da177e4 LT	357	case SIOCBRADDBR:
	358	case SIOCBRDELBR:
	359	{
	360	char buf[IFNAMSIZ];
	361
cb990503	362	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	363	return -EPERM;
	364
	365	if (copy_from_user(buf, uarg, IFNAMSIZ))
	366	return -EFAULT;
	367
	368	buf[IFNAMSIZ-1] = 0;
	369	if (cmd == SIOCBRADDBR)
4aa678ba	370	return br_add_bridge(net, buf);
1da177e4	371
4aa678ba	372	return br_del_bridge(net, buf);
1da177e4 LT	373	}
	374	}
	375	return -EOPNOTSUPP;
	376	}
	377
	378	int br_dev_ioctl(struct net_device dev, struct ifreq rq, int cmd)
	379	{
	380	struct net_bridge *br = netdev_priv(dev);
	381
31a5b837	382	switch (cmd) {
1da177e4 LT	383	case SIOCDEVPRIVATE:
	384	return old_dev_ioctl(dev, rq, cmd);
	385
	386	case SIOCBRADDIF:
	387	case SIOCBRDELIF:
	388	return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
	389
	390	}
	391
28a16c97	392	br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
1da177e4 LT	393	return -EOPNOTSUPP;
1da177e4 LT	394	}