[GitHub/mt8127/android_kernel_alcatel_ttab.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"

/* 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_device *dev;
	int ret;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	dev = __dev_get_by_index(dev_net(br->dev), 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 compatability.
 */
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 (!capable(CAP_NET_ADMIN))
			return -EPERM;

		spin_lock_bh(&br->lock);
		br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
		if (br_is_root_bridge(br))
			br->forward_delay = br->bridge_forward_delay;
		spin_unlock_bh(&br->lock);
		return 0;

	case BRCTL_SET_BRIDGE_HELLO_TIME:
	{
		unsigned long t = clock_t_to_jiffies(args[1]);
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;

		if (t < HZ)
			return -EINVAL;

		spin_lock_bh(&br->lock);
		br->bridge_hello_time = t;
		if (br_is_root_bridge(br))
			br->hello_time = br->bridge_hello_time;
		spin_unlock_bh(&br->lock);
		return 0;
	}

	case BRCTL_SET_BRIDGE_MAX_AGE:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;

		spin_lock_bh(&br->lock);
		br->bridge_max_age = clock_t_to_jiffies(args[1]);
		if (br_is_root_bridge(br))
			br->max_age = br->bridge_max_age;
		spin_unlock_bh(&br->lock);
		return 0;

	case BRCTL_SET_AGEING_TIME:
		if (!capable(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 (!capable(CAP_NET_ADMIN))
			return -EPERM;

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

	case BRCTL_SET_BRIDGE_PRIORITY:
		if (!capable(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 = 0;

		if (!capable(CAP_NET_ADMIN))
			return -EPERM;

		if (args[2] >= (1<<(16-BR_PORT_BITS)))
			return -ERANGE;

		spin_lock_bh(&br->lock);
		if ((p = br_get_port(br, args[1])) == NULL)
			ret = -EINVAL;
		else
			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 = 0;

		if (!capable(CAP_NET_ADMIN))
			return -EPERM;

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

		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 (!capable(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 (!capable(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);

	}

	pr_debug("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
	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)
	87	{
	88	struct net_device *dev;
	89	int ret;
	90
	91	if (!capable(CAP_NET_ADMIN))
	92	return -EPERM;
	93
31ef30c7	94	dev = __dev_get_by_index(dev_net(br->dev), ifindex);
1da177e4 LT	95	if (dev == NULL)
1da177e4 LT	96	return -EINVAL;
9d6f229f	97
1da177e4 LT	98	if (isadd)
	99	ret = br_add_if(br, dev);
	100	else
	101	ret = br_del_if(br, dev);
	102
1da177e4 LT	103	return ret;
	104	}
	105
	106	/*
	107	* Legacy ioctl's through SIOCDEVPRIVATE
	108	* This interface is deprecated because it was too difficult to
	109	* to do the translation for 32/64bit ioctl compatability.
	110	*/
	111	static int old_dev_ioctl(struct net_device dev, struct ifreq rq, int cmd)
	112	{
	113	struct net_bridge *br = netdev_priv(dev);
	114	unsigned long args[4];
9d6f229f	115
1da177e4 LT	116	if (copy_from_user(args, rq->ifr_data, sizeof(args)))
	117	return -EFAULT;
	118
	119	switch (args[0]) {
	120	case BRCTL_ADD_IF:
	121	case BRCTL_DEL_IF:
	122	return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
	123
	124	case BRCTL_GET_BRIDGE_INFO:
	125	{
	126	struct __bridge_info b;
	127
	128	memset(&b, 0, sizeof(struct __bridge_info));
	129	rcu_read_lock();
	130	memcpy(&b.designated_root, &br->designated_root, 8);
	131	memcpy(&b.bridge_id, &br->bridge_id, 8);
	132	b.root_path_cost = br->root_path_cost;
	133	b.max_age = jiffies_to_clock_t(br->max_age);
	134	b.hello_time = jiffies_to_clock_t(br->hello_time);
	135	b.forward_delay = br->forward_delay;
	136	b.bridge_max_age = br->bridge_max_age;
	137	b.bridge_hello_time = br->bridge_hello_time;
	138	b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
	139	b.topology_change = br->topology_change;
	140	b.topology_change_detected = br->topology_change_detected;
	141	b.root_port = br->root_port;
9cde0708 SH	142
9cde0708 SH	143	b.stp_enabled = (br->stp_enabled != BR_NO_STP);
1da177e4 LT	144	b.ageing_time = jiffies_to_clock_t(br->ageing_time);
	145	b.hello_timer_value = br_timer_value(&br->hello_timer);
	146	b.tcn_timer_value = br_timer_value(&br->tcn_timer);
	147	b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
	148	b.gc_timer_value = br_timer_value(&br->gc_timer);
9d6f229f	149	rcu_read_unlock();
1da177e4 LT	150
	151	if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
	152	return -EFAULT;
	153
	154	return 0;
	155	}
	156
	157	case BRCTL_GET_PORT_LIST:
	158	{
	159	int num, *indices;
	160
	161	num = args[2];
	162	if (num < 0)
	163	return -EINVAL;
	164	if (num == 0)
	165	num = 256;
	166	if (num > BR_MAX_PORTS)
	167	num = BR_MAX_PORTS;
	168
0da974f4	169	indices = kcalloc(num, sizeof(int), GFP_KERNEL);
1da177e4 LT	170	if (indices == NULL)
	171	return -ENOMEM;
	172
1da177e4 LT	173	get_port_ifindices(br, indices, num);
	174	if (copy_to_user((void __user )args[1], indices, numsizeof(int)))
	175	num = -EFAULT;
	176	kfree(indices);
	177	return num;
	178	}
	179
	180	case BRCTL_SET_BRIDGE_FORWARD_DELAY:
	181	if (!capable(CAP_NET_ADMIN))
	182	return -EPERM;
	183
	184	spin_lock_bh(&br->lock);
	185	br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
	186	if (br_is_root_bridge(br))
	187	br->forward_delay = br->bridge_forward_delay;
	188	spin_unlock_bh(&br->lock);
	189	return 0;
	190
	191	case BRCTL_SET_BRIDGE_HELLO_TIME:
8d4698f7 SH	192	{
8d4698f7 SH	193	unsigned long t = clock_t_to_jiffies(args[1]);
1da177e4 LT	194	if (!capable(CAP_NET_ADMIN))
	195	return -EPERM;
	196
8d4698f7 SH	197	if (t < HZ)
	198	return -EINVAL;
	199
1da177e4	200	spin_lock_bh(&br->lock);
8d4698f7	201	br->bridge_hello_time = t;
1da177e4 LT	202	if (br_is_root_bridge(br))
	203	br->hello_time = br->bridge_hello_time;
	204	spin_unlock_bh(&br->lock);
	205	return 0;
8d4698f7	206	}
1da177e4 LT	207
	208	case BRCTL_SET_BRIDGE_MAX_AGE:
	209	if (!capable(CAP_NET_ADMIN))
	210	return -EPERM;
	211
	212	spin_lock_bh(&br->lock);
	213	br->bridge_max_age = clock_t_to_jiffies(args[1]);
	214	if (br_is_root_bridge(br))
	215	br->max_age = br->bridge_max_age;
	216	spin_unlock_bh(&br->lock);
	217	return 0;
	218
	219	case BRCTL_SET_AGEING_TIME:
	220	if (!capable(CAP_NET_ADMIN))
	221	return -EPERM;
	222
	223	br->ageing_time = clock_t_to_jiffies(args[1]);
	224	return 0;
	225
	226	case BRCTL_GET_PORT_INFO:
	227	{
	228	struct __port_info p;
	229	struct net_bridge_port *pt;
	230
	231	rcu_read_lock();
	232	if ((pt = br_get_port(br, args[2])) == NULL) {
	233	rcu_read_unlock();
	234	return -EINVAL;
	235	}
	236
	237	memset(&p, 0, sizeof(struct __port_info));
	238	memcpy(&p.designated_root, &pt->designated_root, 8);
	239	memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
	240	p.port_id = pt->port_id;
	241	p.designated_port = pt->designated_port;
	242	p.path_cost = pt->path_cost;
	243	p.designated_cost = pt->designated_cost;
	244	p.state = pt->state;
	245	p.top_change_ack = pt->topology_change_ack;
	246	p.config_pending = pt->config_pending;
	247	p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
	248	p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
	249	p.hold_timer_value = br_timer_value(&pt->hold_timer);
	250
	251	rcu_read_unlock();
	252
	253	if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
	254	return -EFAULT;
	255
	256	return 0;
	257	}
	258
	259	case BRCTL_SET_BRIDGE_STP_STATE:
	260	if (!capable(CAP_NET_ADMIN))
	261	return -EPERM;
	262
9cde0708	263	br_stp_set_enabled(br, args[1]);
1da177e4 LT	264	return 0;
	265
	266	case BRCTL_SET_BRIDGE_PRIORITY:
	267	if (!capable(CAP_NET_ADMIN))
	268	return -EPERM;
	269
	270	spin_lock_bh(&br->lock);
	271	br_stp_set_bridge_priority(br, args[1]);
	272	spin_unlock_bh(&br->lock);
	273	return 0;
	274
	275	case BRCTL_SET_PORT_PRIORITY:
	276	{
	277	struct net_bridge_port *p;
	278	int ret = 0;
	279
	280	if (!capable(CAP_NET_ADMIN))
	281	return -EPERM;
	282
	283	if (args[2] >= (1<<(16-BR_PORT_BITS)))
	284	return -ERANGE;
	285
	286	spin_lock_bh(&br->lock);
9d6f229f	287	if ((p = br_get_port(br, args[1])) == NULL)
1da177e4 LT	288	ret = -EINVAL;
	289	else
	290	br_stp_set_port_priority(p, args[2]);
	291	spin_unlock_bh(&br->lock);
	292	return ret;
	293	}
	294
	295	case BRCTL_SET_PATH_COST:
	296	{
	297	struct net_bridge_port *p;
	298	int ret = 0;
	299
	300	if (!capable(CAP_NET_ADMIN))
	301	return -EPERM;
	302
1da177e4 LT	303	if ((p = br_get_port(br, args[1])) == NULL)
	304	ret = -EINVAL;
	305	else
	306	br_stp_set_path_cost(p, args[2]);
6548cda2	307
1da177e4 LT	308	return ret;
	309	}
	310
	311	case BRCTL_GET_FDB_ENTRIES:
9d6f229f	312	return get_fdb_entries(br, (void __user *)args[1],
1da177e4 LT	313	args[2], args[3]);
	314	}
	315
	316	return -EOPNOTSUPP;
	317	}
	318
4aa678ba	319	static int old_deviceless(struct net net, void __user uarg)
1da177e4 LT	320	{
	321	unsigned long args[3];
	322
	323	if (copy_from_user(args, uarg, sizeof(args)))
	324	return -EFAULT;
	325
	326	switch (args[0]) {
	327	case BRCTL_GET_VERSION:
	328	return BRCTL_VERSION;
	329
	330	case BRCTL_GET_BRIDGES:
	331	{
	332	int *indices;
	333	int ret = 0;
	334
	335	if (args[2] >= 2048)
	336	return -ENOMEM;
0da974f4	337	indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
1da177e4 LT	338	if (indices == NULL)
	339	return -ENOMEM;
	340
4aa678ba	341	args[2] = get_bridge_ifindices(net, indices, args[2]);
1da177e4 LT	342
	343	ret = copy_to_user((void __user )args[1], indices, args[2]sizeof(int))
	344	? -EFAULT : args[2];
	345
	346	kfree(indices);
	347	return ret;
	348	}
	349
	350	case BRCTL_ADD_BRIDGE:
	351	case BRCTL_DEL_BRIDGE:
	352	{
	353	char buf[IFNAMSIZ];
	354
	355	if (!capable(CAP_NET_ADMIN))
	356	return -EPERM;
	357
	358	if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
	359	return -EFAULT;
	360
	361	buf[IFNAMSIZ-1] = 0;
	362
	363	if (args[0] == BRCTL_ADD_BRIDGE)
4aa678ba	364	return br_add_bridge(net, buf);
1da177e4	365
4aa678ba	366	return br_del_bridge(net, buf);
1da177e4 LT	367	}
	368	}
	369
	370	return -EOPNOTSUPP;
	371	}
	372
881d966b	373	int br_ioctl_deviceless_stub(struct net net, unsigned int cmd, void __user uarg)
1da177e4 LT	374	{
	375	switch (cmd) {
	376	case SIOCGIFBR:
	377	case SIOCSIFBR:
4aa678ba	378	return old_deviceless(net, uarg);
9d6f229f	379
1da177e4 LT	380	case SIOCBRADDBR:
	381	case SIOCBRDELBR:
	382	{
	383	char buf[IFNAMSIZ];
	384
	385	if (!capable(CAP_NET_ADMIN))
	386	return -EPERM;
	387
	388	if (copy_from_user(buf, uarg, IFNAMSIZ))
	389	return -EFAULT;
	390
	391	buf[IFNAMSIZ-1] = 0;
	392	if (cmd == SIOCBRADDBR)
4aa678ba	393	return br_add_bridge(net, buf);
1da177e4	394
4aa678ba	395	return br_del_bridge(net, buf);
1da177e4 LT	396	}
	397	}
	398	return -EOPNOTSUPP;
	399	}
	400
	401	int br_dev_ioctl(struct net_device dev, struct ifreq rq, int cmd)
	402	{
	403	struct net_bridge *br = netdev_priv(dev);
	404
	405	switch(cmd) {
	406	case SIOCDEVPRIVATE:
	407	return old_dev_ioctl(dev, rq, cmd);
	408
	409	case SIOCBRADDIF:
	410	case SIOCBRDELIF:
	411	return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
	412
	413	}
	414
	415	pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
	416	return -EOPNOTSUPP;
	417	}