[linux-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 do the translation for 32/64bit ioctl compatibility.
 */
int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *p = NULL;
	unsigned long args[4];
	void __user *argp;
	int ret = -EOPNOTSUPP;

	if (in_compat_syscall()) {
		unsigned int cargs[4];

		if (copy_from_user(cargs, data, sizeof(cargs)))
			return -EFAULT;

		args[0] = cargs[0];
		args[1] = cargs[1];
		args[2] = cargs[2];
		args[3] = cargs[3];

		argp = compat_ptr(args[1]);
	} else {
		if (copy_from_user(args, data, sizeof(args)))
			return -EFAULT;

		argp = (void __user *)args[1];
	}

	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(argp, 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(argp, &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;

		ret = br_stp_set_enabled(br, args[1], NULL);
		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, argp, 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(uarg, 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, uarg, 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 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
4bbd026c	106	* This interface is deprecated because it was too difficult
25985edc	107	* to do the translation for 32/64bit ioctl compatibility.
1da177e4	108	*/
561d8352	109	int br_dev_siocdevprivate(struct net_device dev, struct ifreq rq, void __user *data, int cmd)
1da177e4 LT	110	{
1da177e4 LT	111	struct net_bridge *br = netdev_priv(dev);
bf871ad7	112	struct net_bridge_port *p = NULL;
1da177e4	113	unsigned long args[4];
561d8352	114	void __user *argp;
bf871ad7	115	int ret = -EOPNOTSUPP;
9d6f229f	116
561d8352 AB	117	if (in_compat_syscall()) {
	118	unsigned int cargs[4];
	119
	120	if (copy_from_user(cargs, data, sizeof(cargs)))
	121	return -EFAULT;
	122
	123	args[0] = cargs[0];
	124	args[1] = cargs[1];
	125	args[2] = cargs[2];
	126	args[3] = cargs[3];
	127
	128	argp = compat_ptr(args[1]);
	129	} else {
	130	if (copy_from_user(args, data, sizeof(args)))
	131	return -EFAULT;
	132
	133	argp = (void __user *)args[1];
	134	}
1da177e4 LT	135
	136	switch (args[0]) {
	137	case BRCTL_ADD_IF:
	138	case BRCTL_DEL_IF:
	139	return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
	140
	141	case BRCTL_GET_BRIDGE_INFO:
	142	{
	143	struct __bridge_info b;
	144
	145	memset(&b, 0, sizeof(struct __bridge_info));
	146	rcu_read_lock();
	147	memcpy(&b.designated_root, &br->designated_root, 8);
	148	memcpy(&b.bridge_id, &br->bridge_id, 8);
	149	b.root_path_cost = br->root_path_cost;
	150	b.max_age = jiffies_to_clock_t(br->max_age);
	151	b.hello_time = jiffies_to_clock_t(br->hello_time);
	152	b.forward_delay = br->forward_delay;
	153	b.bridge_max_age = br->bridge_max_age;
	154	b.bridge_hello_time = br->bridge_hello_time;
	155	b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
	156	b.topology_change = br->topology_change;
	157	b.topology_change_detected = br->topology_change_detected;
	158	b.root_port = br->root_port;
9cde0708 SH	159
9cde0708 SH	160	b.stp_enabled = (br->stp_enabled != BR_NO_STP);
1da177e4 LT	161	b.ageing_time = jiffies_to_clock_t(br->ageing_time);
	162	b.hello_timer_value = br_timer_value(&br->hello_timer);
	163	b.tcn_timer_value = br_timer_value(&br->tcn_timer);
	164	b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
f7cdee8a	165	b.gc_timer_value = br_timer_value(&br->gc_work.timer);
9d6f229f	166	rcu_read_unlock();
1da177e4 LT	167
	168	if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
	169	return -EFAULT;
	170
	171	return 0;
	172	}
	173
	174	case BRCTL_GET_PORT_LIST:
	175	{
	176	int num, *indices;
	177
	178	num = args[2];
	179	if (num < 0)
	180	return -EINVAL;
	181	if (num == 0)
	182	num = 256;
	183	if (num > BR_MAX_PORTS)
	184	num = BR_MAX_PORTS;
	185
0da974f4	186	indices = kcalloc(num, sizeof(int), GFP_KERNEL);
1da177e4 LT	187	if (indices == NULL)
	188	return -ENOMEM;
	189
1da177e4	190	get_port_ifindices(br, indices, num);
561d8352	191	if (copy_to_user(argp, indices, num * sizeof(int)))
1da177e4 LT	192	num = -EFAULT;
	193	kfree(indices);
	194	return num;
	195	}
	196
	197	case BRCTL_SET_BRIDGE_FORWARD_DELAY:
cb990503	198	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	199	return -EPERM;
1da177e4 LT	200
bf871ad7 XL	201	ret = br_set_forward_delay(br, args[1]);
bf871ad7 XL	202	break;
1da177e4 LT	203
1da177e4 LT	204	case BRCTL_SET_BRIDGE_HELLO_TIME:
cb990503	205	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	206	return -EPERM;
1da177e4 LT	207
bf871ad7 XL	208	ret = br_set_hello_time(br, args[1]);
bf871ad7 XL	209	break;
1da177e4 LT	210
1da177e4 LT	211	case BRCTL_SET_BRIDGE_MAX_AGE:
cb990503	212	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	213	return -EPERM;
1da177e4 LT	214
bf871ad7 XL	215	ret = br_set_max_age(br, args[1]);
bf871ad7 XL	216	break;
1da177e4 LT	217
1da177e4 LT	218	case BRCTL_SET_AGEING_TIME:
cb990503	219	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	220	return -EPERM;
1da177e4 LT	221
bf871ad7 XL	222	ret = br_set_ageing_time(br, args[1]);
bf871ad7 XL	223	break;
1da177e4 LT	224
	225	case BRCTL_GET_PORT_INFO:
	226	{
	227	struct __port_info p;
	228	struct net_bridge_port *pt;
	229
	230	rcu_read_lock();
	231	if ((pt = br_get_port(br, args[2])) == NULL) {
	232	rcu_read_unlock();
	233	return -EINVAL;
	234	}
	235
	236	memset(&p, 0, sizeof(struct __port_info));
	237	memcpy(&p.designated_root, &pt->designated_root, 8);
	238	memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
	239	p.port_id = pt->port_id;
	240	p.designated_port = pt->designated_port;
	241	p.path_cost = pt->path_cost;
	242	p.designated_cost = pt->designated_cost;
	243	p.state = pt->state;
	244	p.top_change_ack = pt->topology_change_ack;
	245	p.config_pending = pt->config_pending;
	246	p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
	247	p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
	248	p.hold_timer_value = br_timer_value(&pt->hold_timer);
	249
	250	rcu_read_unlock();
	251
561d8352	252	if (copy_to_user(argp, &p, sizeof(p)))
1da177e4 LT	253	return -EFAULT;
	254
	255	return 0;
	256	}
	257
	258	case BRCTL_SET_BRIDGE_STP_STATE:
cb990503	259	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	260	return -EPERM;
1da177e4 LT	261
419dba8a	262	ret = br_stp_set_enabled(br, args[1], NULL);
bf871ad7	263	break;
1da177e4 LT	264
1da177e4 LT	265	case BRCTL_SET_BRIDGE_PRIORITY:
cb990503	266	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	267	return -EPERM;
1da177e4 LT	268
1da177e4	269	br_stp_set_bridge_priority(br, args[1]);
bf871ad7 XL	270	ret = 0;
bf871ad7 XL	271	break;
1da177e4 LT	272
	273	case BRCTL_SET_PORT_PRIORITY:
	274	{
cb990503	275	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	276	return -EPERM;
1da177e4 LT	277
1da177e4	278	spin_lock_bh(&br->lock);
9d6f229f	279	if ((p = br_get_port(br, args[1])) == NULL)
1da177e4 LT	280	ret = -EINVAL;
1da177e4 LT	281	else
14f98f25	282	ret = br_stp_set_port_priority(p, args[2]);
1da177e4	283	spin_unlock_bh(&br->lock);
bf871ad7	284	break;
1da177e4 LT	285	}
	286
	287	case BRCTL_SET_PATH_COST:
	288	{
cb990503	289	if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	290	return -EPERM;
1da177e4 LT	291
14f98f25	292	spin_lock_bh(&br->lock);
1da177e4 LT	293	if ((p = br_get_port(br, args[1])) == NULL)
	294	ret = -EINVAL;
	295	else
14f98f25	296	ret = br_stp_set_path_cost(p, args[2]);
14f98f25	297	spin_unlock_bh(&br->lock);
bf871ad7	298	break;
1da177e4 LT	299	}
	300
	301	case BRCTL_GET_FDB_ENTRIES:
561d8352	302	return get_fdb_entries(br, argp, args[2], args[3]);
1da177e4 LT	303	}
1da177e4 LT	304
bf871ad7 XL	305	if (!ret) {
bf871ad7 XL	306	if (p)
92899063	307	br_ifinfo_notify(RTM_NEWLINK, NULL, p);
bf871ad7 XL	308	else
	309	netdev_state_change(br->dev);
	310	}
	311
	312	return ret;
1da177e4 LT	313	}
1da177e4 LT	314
4aa678ba	315	static int old_deviceless(struct net net, void __user uarg)
1da177e4 LT	316	{
	317	unsigned long args[3];
	318
	319	if (copy_from_user(args, uarg, sizeof(args)))
	320	return -EFAULT;
	321
	322	switch (args[0]) {
	323	case BRCTL_GET_VERSION:
	324	return BRCTL_VERSION;
	325
	326	case BRCTL_GET_BRIDGES:
	327	{
	328	int *indices;
	329	int ret = 0;
	330
	331	if (args[2] >= 2048)
	332	return -ENOMEM;
0da974f4	333	indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
1da177e4 LT	334	if (indices == NULL)
	335	return -ENOMEM;
	336
4aa678ba	337	args[2] = get_bridge_ifindices(net, indices, args[2]);
1da177e4	338
561d8352	339	ret = copy_to_user(uarg, indices, args[2]*sizeof(int))
1da177e4 LT	340	? -EFAULT : args[2];
	341
	342	kfree(indices);
	343	return ret;
	344	}
	345
	346	case BRCTL_ADD_BRIDGE:
	347	case BRCTL_DEL_BRIDGE:
	348	{
	349	char buf[IFNAMSIZ];
	350
cb990503	351	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	352	return -EPERM;
1da177e4 LT	353
561d8352	354	if (copy_from_user(buf, uarg, IFNAMSIZ))
1da177e4 LT	355	return -EFAULT;
	356
	357	buf[IFNAMSIZ-1] = 0;
	358
	359	if (args[0] == BRCTL_ADD_BRIDGE)
4aa678ba	360	return br_add_bridge(net, buf);
1da177e4	361
4aa678ba	362	return br_del_bridge(net, buf);
1da177e4 LT	363	}
	364	}
	365
	366	return -EOPNOTSUPP;
	367	}
	368
881d966b	369	int br_ioctl_deviceless_stub(struct net net, unsigned int cmd, void __user uarg)
1da177e4 LT	370	{
	371	switch (cmd) {
	372	case SIOCGIFBR:
	373	case SIOCSIFBR:
4aa678ba	374	return old_deviceless(net, uarg);
9d6f229f	375
1da177e4 LT	376	case SIOCBRADDBR:
	377	case SIOCBRDELBR:
	378	{
	379	char buf[IFNAMSIZ];
	380
cb990503	381	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1da177e4 LT	382	return -EPERM;
	383
	384	if (copy_from_user(buf, uarg, IFNAMSIZ))
	385	return -EFAULT;
	386
	387	buf[IFNAMSIZ-1] = 0;
	388	if (cmd == SIOCBRADDBR)
4aa678ba	389	return br_add_bridge(net, buf);
1da177e4	390
4aa678ba	391	return br_del_bridge(net, buf);
1da177e4 LT	392	}
	393	}
	394	return -EOPNOTSUPP;
	395	}
	396
	397	int br_dev_ioctl(struct net_device dev, struct ifreq rq, int cmd)
	398	{
	399	struct net_bridge *br = netdev_priv(dev);
	400
31a5b837	401	switch (cmd) {
1da177e4 LT	402	case SIOCBRADDIF:
	403	case SIOCBRDELIF:
	404	return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
	405
	406	}
	407
28a16c97	408	br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);
1da177e4 LT	409	return -EOPNOTSUPP;
1da177e4 LT	410	}