[linux-2.6-block.git] / net / bridge / br_ioctl.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Ioctl handler
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 */

#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 <linux/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, NULL);
	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);
	struct net_bridge_port *p = NULL;
	unsigned long args[4];
	int ret = -EOPNOTSUPP;

	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_work.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;

		ret = br_set_forward_delay(br, args[1]);
		break;

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

		ret = br_set_hello_time(br, args[1]);
		break;

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

		ret = br_set_max_age(br, args[1]);
		break;

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

		ret = br_set_ageing_time(br, args[1]);
		break;

	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]);
		ret = 0;
		break;

	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]);
		ret = 0;
		break;

	case BRCTL_SET_PORT_PRIORITY:
	{
		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);
		break;
	}

	case BRCTL_SET_PATH_COST:
	{
		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);
		break;
	}

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

	if (!ret) {
		if (p)
			br_ifinfo_notify(RTM_NEWLINK, NULL, p);
		else
			netdev_state_change(br->dev);
	}

	return ret;
}

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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* Ioctl handler
	4	* Linux ethernet bridge
	5	*
	6	* Authors:
	7	* Lennert Buytenhek <buytenh@gnu.org>
1da177e4 LT	8	*/
1da177e4 LT	9
4fc268d2	10	#include <linux/capability.h>
1da177e4 LT	11	#include <linux/kernel.h>
	12	#include <linux/if_bridge.h>
	13	#include <linux/netdevice.h>
5a0e3ad6	14	#include <linux/slab.h>
1da177e4	15	#include <linux/times.h>
881d966b	16	#include <net/net_namespace.h>
7c0f6ba6	17	#include <linux/uaccess.h>
1da177e4 LT	18	#include "br_private.h"
1da177e4 LT	19
4aa678ba	20	static int get_bridge_ifindices(struct net net, int indices, int num)
1da177e4 LT	21	{
	22	struct net_device *dev;
	23	int i = 0;
	24
31ca0458 NA	25	rcu_read_lock();
31ca0458 NA	26	for_each_netdev_rcu(net, dev) {
7562f876 PE	27	if (i >= num)
7562f876 PE	28	break;
9d6f229f	29	if (dev->priv_flags & IFF_EBRIDGE)
1da177e4 LT	30	indices[i++] = dev->ifindex;
1da177e4 LT	31	}
31ca0458	32	rcu_read_unlock();
1da177e4 LT	33
	34	return i;
	35	}
	36
	37	/* called with RTNL */
	38	static void get_port_ifindices(struct net_bridge br, int ifindices, int num)
	39	{
	40	struct net_bridge_port *p;
	41
	42	list_for_each_entry(p, &br->port_list, list) {
	43	if (p->port_no < num)
	44	ifindices[p->port_no] = p->dev->ifindex;
	45	}
	46	}
	47
	48	/*
	49	* Format up to a page worth of forwarding table entries
	50	* userbuf -- where to copy result
	51	* maxnum -- maximum number of entries desired
	52	* (limited to a page for sanity)
	53	* offset -- number of records to skip
	54	*/
9d6f229f	55	static int get_fdb_entries(struct net_bridge br, void __user userbuf,
1da177e4 LT	56	unsigned long maxnum, unsigned long offset)
	57	{
	58	int num;
	59	void *buf;
ba8379b2	60	size_t size;
1da177e4	61
ba8379b2 CW	62	/* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
ba8379b2 CW	63	if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
1da177e4	64	maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
ba8379b2 CW	65
ba8379b2 CW	66	size = maxnum * sizeof(struct __fdb_entry);
1da177e4 LT	67
	68	buf = kmalloc(size, GFP_USER);
	69	if (!buf)
	70	return -ENOMEM;
9d6f229f	71
1da177e4 LT	72	num = br_fdb_fillbuf(br, buf, maxnum, offset);
	73	if (num > 0) {
	74	if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
	75	num = -EFAULT;
	76	}
	77	kfree(buf);
	78
	79	return num;
	80	}
	81
31ef30c7	82	/* called with RTNL */
1da177e4 LT	83	static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
1da177e4 LT	84	{
cb990503	85	struct net *net = dev_net(br->dev);
1da177e4 LT	86	struct net_device *dev;
	87	int ret;
	88
cb990503	89	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	90	return -EPERM;
1da177e4 LT	91
cb990503	92	dev = __dev_get_by_index(net, ifindex);
1da177e4 LT	93	if (dev == NULL)
1da177e4 LT	94	return -EINVAL;
9d6f229f	95
1da177e4	96	if (isadd)
ca752be0	97	ret = br_add_if(br, dev, NULL);
eccaa9e5	98	else
1da177e4 LT	99	ret = br_del_if(br, dev);
1da177e4 LT	100
1da177e4 LT	101	return ret;
	102	}
	103
	104	/*
	105	* Legacy ioctl's through SIOCDEVPRIVATE
	106	* This interface is deprecated because it was too difficult to
25985edc	107	* to do the translation for 32/64bit ioctl compatibility.
1da177e4 LT	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);
bf871ad7	112	struct net_bridge_port *p = NULL;
1da177e4	113	unsigned long args[4];
bf871ad7	114	int ret = -EOPNOTSUPP;
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);
f7cdee8a	148	b.gc_timer_value = br_timer_value(&br->gc_work.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:
cb990503	181	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	182	return -EPERM;
1da177e4 LT	183
bf871ad7 XL	184	ret = br_set_forward_delay(br, args[1]);
bf871ad7 XL	185	break;
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
bf871ad7 XL	191	ret = br_set_hello_time(br, args[1]);
bf871ad7 XL	192	break;
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
bf871ad7 XL	198	ret = br_set_max_age(br, args[1]);
bf871ad7 XL	199	break;
1da177e4 LT	200
1da177e4 LT	201	case BRCTL_SET_AGEING_TIME:
cb990503	202	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	203	return -EPERM;
1da177e4 LT	204
bf871ad7 XL	205	ret = br_set_ageing_time(br, args[1]);
bf871ad7 XL	206	break;
1da177e4 LT	207
	208	case BRCTL_GET_PORT_INFO:
	209	{
	210	struct __port_info p;
	211	struct net_bridge_port *pt;
	212
	213	rcu_read_lock();
	214	if ((pt = br_get_port(br, args[2])) == NULL) {
	215	rcu_read_unlock();
	216	return -EINVAL;
	217	}
	218
	219	memset(&p, 0, sizeof(struct __port_info));
	220	memcpy(&p.designated_root, &pt->designated_root, 8);
	221	memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
	222	p.port_id = pt->port_id;
	223	p.designated_port = pt->designated_port;
	224	p.path_cost = pt->path_cost;
	225	p.designated_cost = pt->designated_cost;
	226	p.state = pt->state;
	227	p.top_change_ack = pt->topology_change_ack;
	228	p.config_pending = pt->config_pending;
	229	p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
	230	p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
	231	p.hold_timer_value = br_timer_value(&pt->hold_timer);
	232
	233	rcu_read_unlock();
	234
	235	if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
	236	return -EFAULT;
	237
	238	return 0;
	239	}
	240
	241	case BRCTL_SET_BRIDGE_STP_STATE:
cb990503	242	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	243	return -EPERM;
1da177e4 LT	244
9cde0708	245	br_stp_set_enabled(br, args[1]);
bf871ad7 XL	246	ret = 0;
bf871ad7 XL	247	break;
1da177e4 LT	248
1da177e4 LT	249	case BRCTL_SET_BRIDGE_PRIORITY:
cb990503	250	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	251	return -EPERM;
1da177e4 LT	252
1da177e4	253	br_stp_set_bridge_priority(br, args[1]);
bf871ad7 XL	254	ret = 0;
bf871ad7 XL	255	break;
1da177e4 LT	256
	257	case BRCTL_SET_PORT_PRIORITY:
	258	{
cb990503	259	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	260	return -EPERM;
1da177e4 LT	261
1da177e4	262	spin_lock_bh(&br->lock);
9d6f229f	263	if ((p = br_get_port(br, args[1])) == NULL)
1da177e4 LT	264	ret = -EINVAL;
1da177e4 LT	265	else
14f98f25	266	ret = br_stp_set_port_priority(p, args[2]);
1da177e4	267	spin_unlock_bh(&br->lock);
bf871ad7	268	break;
1da177e4 LT	269	}
	270
	271	case BRCTL_SET_PATH_COST:
	272	{
cb990503	273	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	274	return -EPERM;
1da177e4 LT	275
14f98f25	276	spin_lock_bh(&br->lock);
1da177e4 LT	277	if ((p = br_get_port(br, args[1])) == NULL)
	278	ret = -EINVAL;
	279	else
14f98f25	280	ret = br_stp_set_path_cost(p, args[2]);
14f98f25	281	spin_unlock_bh(&br->lock);
bf871ad7	282	break;
1da177e4 LT	283	}
	284
	285	case BRCTL_GET_FDB_ENTRIES:
9d6f229f	286	return get_fdb_entries(br, (void __user *)args[1],
1da177e4 LT	287	args[2], args[3]);
	288	}
	289
bf871ad7 XL	290	if (!ret) {
bf871ad7 XL	291	if (p)
92899063	292	br_ifinfo_notify(RTM_NEWLINK, NULL, p);
bf871ad7 XL	293	else
	294	netdev_state_change(br->dev);
	295	}
	296
	297	return ret;
1da177e4 LT	298	}
1da177e4 LT	299
4aa678ba	300	static int old_deviceless(struct net net, void __user uarg)
1da177e4 LT	301	{
	302	unsigned long args[3];
	303
	304	if (copy_from_user(args, uarg, sizeof(args)))
	305	return -EFAULT;
	306
	307	switch (args[0]) {
	308	case BRCTL_GET_VERSION:
	309	return BRCTL_VERSION;
	310
	311	case BRCTL_GET_BRIDGES:
	312	{
	313	int *indices;
	314	int ret = 0;
	315
	316	if (args[2] >= 2048)
	317	return -ENOMEM;
0da974f4	318	indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
1da177e4 LT	319	if (indices == NULL)
	320	return -ENOMEM;
	321
4aa678ba	322	args[2] = get_bridge_ifindices(net, indices, args[2]);
1da177e4 LT	323
	324	ret = copy_to_user((void __user )args[1], indices, args[2]sizeof(int))
	325	? -EFAULT : args[2];
	326
	327	kfree(indices);
	328	return ret;
	329	}
	330
	331	case BRCTL_ADD_BRIDGE:
	332	case BRCTL_DEL_BRIDGE:
	333	{
	334	char buf[IFNAMSIZ];
	335
cb990503	336	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	337	return -EPERM;
	338
	339	if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
	340	return -EFAULT;
	341
	342	buf[IFNAMSIZ-1] = 0;
	343
	344	if (args[0] == BRCTL_ADD_BRIDGE)
4aa678ba	345	return br_add_bridge(net, buf);
1da177e4	346
4aa678ba	347	return br_del_bridge(net, buf);
1da177e4 LT	348	}
	349	}
	350
	351	return -EOPNOTSUPP;
	352	}
	353
881d966b	354	int br_ioctl_deviceless_stub(struct net net, unsigned int cmd, void __user uarg)
1da177e4 LT	355	{
	356	switch (cmd) {
	357	case SIOCGIFBR:
	358	case SIOCSIFBR:
4aa678ba	359	return old_deviceless(net, uarg);
9d6f229f	360
1da177e4 LT	361	case SIOCBRADDBR:
	362	case SIOCBRDELBR:
	363	{
	364	char buf[IFNAMSIZ];
	365
cb990503	366	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	367	return -EPERM;
	368
	369	if (copy_from_user(buf, uarg, IFNAMSIZ))
	370	return -EFAULT;
	371
	372	buf[IFNAMSIZ-1] = 0;
	373	if (cmd == SIOCBRADDBR)
4aa678ba	374	return br_add_bridge(net, buf);
1da177e4	375
4aa678ba	376	return br_del_bridge(net, buf);
1da177e4 LT	377	}
	378	}
	379	return -EOPNOTSUPP;
	380	}
	381
	382	int br_dev_ioctl(struct net_device dev, struct ifreq rq, int cmd)
	383	{
	384	struct net_bridge *br = netdev_priv(dev);
	385
31a5b837	386	switch (cmd) {
1da177e4 LT	387	case SIOCDEVPRIVATE:
	388	return old_dev_ioctl(dev, rq, cmd);
	389
	390	case SIOCBRADDIF:
	391	case SIOCBRDELIF:
	392	return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
	393
	394	}
	395
28a16c97	396	br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
1da177e4 LT	397	return -EOPNOTSUPP;
1da177e4 LT	398	}