[linux-2.6-block.git] / net / core / dev_ioctl.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kmod.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/net_tstamp.h>
#include <linux/wireless.h>
#include <net/wext.h>

/*
 *	Map an interface index to its name (SIOCGIFNAME)
 */

/*
 *	We need this ioctl for efficient implementation of the
 *	if_indextoname() function required by the IPv6 API.  Without
 *	it, we would have to search all the interfaces to find a
 *	match.  --pb
 */

static int dev_ifname(struct net *net, struct ifreq *ifr)
{
	ifr->ifr_name[IFNAMSIZ-1] = 0;
	return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
}

static gifconf_func_t *gifconf_list[NPROTO];

/**
 *	register_gifconf	-	register a SIOCGIF handler
 *	@family: Address family
 *	@gifconf: Function handler
 *
 *	Register protocol dependent address dumping routines. The handler
 *	that is passed must not be freed or reused until it has been replaced
 *	by another handler.
 */
int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}
EXPORT_SYMBOL(register_gifconf);

/*
 *	Perform a SIOCGIFCONF call. This structure will change
 *	size eventually, and there is nothing I can do about it.
 *	Thus we will need a 'compatibility mode'.
 */

int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
{
	struct net_device *dev;
	char __user *pos;
	int len;
	int total;
	int i;

	/*
	 *	Fetch the caller's info block.
	 */

	pos = ifc->ifc_buf;
	len = ifc->ifc_len;

	/*
	 *	Loop over the interfaces, and write an info block for each.
	 */

	total = 0;
	for_each_netdev(net, dev) {
		for (i = 0; i < NPROTO; i++) {
			if (gifconf_list[i]) {
				int done;
				if (!pos)
					done = gifconf_list[i](dev, NULL, 0, size);
				else
					done = gifconf_list[i](dev, pos + total,
							       len - total, size);
				if (done < 0)
					return -EFAULT;
				total += done;
			}
		}
	}

	/*
	 *	All done.  Write the updated control block back to the caller.
	 */
	ifc->ifc_len = total;

	/*
	 * 	Both BSD and Solaris return 0 here, so we do too.
	 */
	return 0;
}

/*
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
 */
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
{
	int err;
	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);

	if (!dev)
		return -ENODEV;

	switch (cmd) {
	case SIOCGIFFLAGS:	/* Get interface flags */
		ifr->ifr_flags = (short) dev_get_flags(dev);
		return 0;

	case SIOCGIFMETRIC:	/* Get the metric on the interface
				   (currently unused) */
		ifr->ifr_metric = 0;
		return 0;

	case SIOCGIFMTU:	/* Get the MTU of a device */
		ifr->ifr_mtu = dev->mtu;
		return 0;

	case SIOCGIFHWADDR:
		if (!dev->addr_len)
			memset(ifr->ifr_hwaddr.sa_data, 0,
			       sizeof(ifr->ifr_hwaddr.sa_data));
		else
			memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
			       min(sizeof(ifr->ifr_hwaddr.sa_data),
				   (size_t)dev->addr_len));
		ifr->ifr_hwaddr.sa_family = dev->type;
		return 0;

	case SIOCGIFSLAVE:
		err = -EINVAL;
		break;

	case SIOCGIFMAP:
		ifr->ifr_map.mem_start = dev->mem_start;
		ifr->ifr_map.mem_end   = dev->mem_end;
		ifr->ifr_map.base_addr = dev->base_addr;
		ifr->ifr_map.irq       = dev->irq;
		ifr->ifr_map.dma       = dev->dma;
		ifr->ifr_map.port      = dev->if_port;
		return 0;

	case SIOCGIFINDEX:
		ifr->ifr_ifindex = dev->ifindex;
		return 0;

	case SIOCGIFTXQLEN:
		ifr->ifr_qlen = dev->tx_queue_len;
		return 0;

	default:
		/* dev_ioctl() should ensure this case
		 * is never reached
		 */
		WARN_ON(1);
		err = -ENOTTY;
		break;

	}
	return err;
}

static int net_hwtstamp_validate(struct ifreq *ifr)
{
	struct hwtstamp_config cfg;
	enum hwtstamp_tx_types tx_type;
	enum hwtstamp_rx_filters rx_filter;
	int tx_type_valid = 0;
	int rx_filter_valid = 0;

	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
		return -EFAULT;

	if (cfg.flags) /* reserved for future extensions */
		return -EINVAL;

	tx_type = cfg.tx_type;
	rx_filter = cfg.rx_filter;

	switch (tx_type) {
	case HWTSTAMP_TX_OFF:
	case HWTSTAMP_TX_ON:
	case HWTSTAMP_TX_ONESTEP_SYNC:
		tx_type_valid = 1;
		break;
	}

	switch (rx_filter) {
	case HWTSTAMP_FILTER_NONE:
	case HWTSTAMP_FILTER_ALL:
	case HWTSTAMP_FILTER_SOME:
	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
	case HWTSTAMP_FILTER_NTP_ALL:
		rx_filter_valid = 1;
		break;
	}

	if (!tx_type_valid || !rx_filter_valid)
		return -ERANGE;

	return 0;
}

/*
 *	Perform the SIOCxIFxxx calls, inside rtnl_lock()
 */
static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
{
	int err;
	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
	const struct net_device_ops *ops;

	if (!dev)
		return -ENODEV;

	ops = dev->netdev_ops;

	switch (cmd) {
	case SIOCSIFFLAGS:	/* Set interface flags */
		return dev_change_flags(dev, ifr->ifr_flags, NULL);

	case SIOCSIFMETRIC:	/* Set the metric on the interface
				   (currently unused) */
		return -EOPNOTSUPP;

	case SIOCSIFMTU:	/* Set the MTU of a device */
		return dev_set_mtu(dev, ifr->ifr_mtu);

	case SIOCSIFHWADDR:
		if (dev->addr_len > sizeof(struct sockaddr))
			return -EINVAL;
		return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL);

	case SIOCSIFHWBROADCAST:
		if (ifr->ifr_hwaddr.sa_family != dev->type)
			return -EINVAL;
		memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
		       min(sizeof(ifr->ifr_hwaddr.sa_data),
			   (size_t)dev->addr_len));
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
		return 0;

	case SIOCSIFMAP:
		if (ops->ndo_set_config) {
			if (!netif_device_present(dev))
				return -ENODEV;
			return ops->ndo_set_config(dev, &ifr->ifr_map);
		}
		return -EOPNOTSUPP;

	case SIOCADDMULTI:
		if (!ops->ndo_set_rx_mode ||
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);

	case SIOCDELMULTI:
		if (!ops->ndo_set_rx_mode ||
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);

	case SIOCSIFTXQLEN:
		if (ifr->ifr_qlen < 0)
			return -EINVAL;
		return dev_change_tx_queue_len(dev, ifr->ifr_qlen);

	case SIOCSIFNAME:
		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
		return dev_change_name(dev, ifr->ifr_newname);

	case SIOCSHWTSTAMP:
		err = net_hwtstamp_validate(ifr);
		if (err)
			return err;
		/* fall through */

	/*
	 *	Unknown or private ioctl
	 */
	default:
		if ((cmd >= SIOCDEVPRIVATE &&
		    cmd <= SIOCDEVPRIVATE + 15) ||
		    cmd == SIOCBONDENSLAVE ||
		    cmd == SIOCBONDRELEASE ||
		    cmd == SIOCBONDSETHWADDR ||
		    cmd == SIOCBONDSLAVEINFOQUERY ||
		    cmd == SIOCBONDINFOQUERY ||
		    cmd == SIOCBONDCHANGEACTIVE ||
		    cmd == SIOCGMIIPHY ||
		    cmd == SIOCGMIIREG ||
		    cmd == SIOCSMIIREG ||
		    cmd == SIOCBRADDIF ||
		    cmd == SIOCBRDELIF ||
		    cmd == SIOCSHWTSTAMP ||
		    cmd == SIOCGHWTSTAMP ||
		    cmd == SIOCWANDEV) {
			err = -EOPNOTSUPP;
			if (ops->ndo_do_ioctl) {
				if (netif_device_present(dev))
					err = ops->ndo_do_ioctl(dev, ifr, cmd);
				else
					err = -ENODEV;
			}
		} else
			err = -EINVAL;

	}
	return err;
}

/**
 *	dev_load 	- load a network module
 *	@net: the applicable net namespace
 *	@name: name of interface
 *
 *	If a network interface is not present and the process has suitable
 *	privileges this function loads the module. If module loading is not
 *	available in this kernel then it becomes a nop.
 */

void dev_load(struct net *net, const char *name)
{
	struct net_device *dev;
	int no_module;

	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	rcu_read_unlock();

	no_module = !dev;
	if (no_module && capable(CAP_NET_ADMIN))
		no_module = request_module("netdev-%s", name);
	if (no_module && capable(CAP_SYS_MODULE))
		request_module("%s", name);
}
EXPORT_SYMBOL(dev_load);

/*
 *	This function handles all "interface"-type I/O control requests. The actual
 *	'doing' part of this is dev_ifsioc above.
 */

/**
 *	dev_ioctl	-	network device ioctl
 *	@net: the applicable net namespace
 *	@cmd: command to issue
 *	@ifr: pointer to a struct ifreq in user space
 *	@need_copyout: whether or not copy_to_user() should be called
 *
 *	Issue ioctl functions to devices. This is normally called by the
 *	user space syscall interfaces but can sometimes be useful for
 *	other purposes. The return value is the return from the syscall if
 *	positive or a negative errno code on error.
 */

int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
{
	int ret;
	char *colon;

	if (need_copyout)
		*need_copyout = true;
	if (cmd == SIOCGIFNAME)
		return dev_ifname(net, ifr);

	ifr->ifr_name[IFNAMSIZ-1] = 0;

	colon = strchr(ifr->ifr_name, ':');
	if (colon)
		*colon = 0;

	/*
	 *	See which interface the caller is talking about.
	 */

	switch (cmd) {
	/*
	 *	These ioctl calls:
	 *	- can be done by all.
	 *	- atomic and do not require locking.
	 *	- return a value
	 */
	case SIOCGIFFLAGS:
	case SIOCGIFMETRIC:
	case SIOCGIFMTU:
	case SIOCGIFHWADDR:
	case SIOCGIFSLAVE:
	case SIOCGIFMAP:
	case SIOCGIFINDEX:
	case SIOCGIFTXQLEN:
		dev_load(net, ifr->ifr_name);
		rcu_read_lock();
		ret = dev_ifsioc_locked(net, ifr, cmd);
		rcu_read_unlock();
		if (colon)
			*colon = ':';
		return ret;

	case SIOCETHTOOL:
		dev_load(net, ifr->ifr_name);
		rtnl_lock();
		ret = dev_ethtool(net, ifr);
		rtnl_unlock();
		if (colon)
			*colon = ':';
		return ret;

	/*
	 *	These ioctl calls:
	 *	- require superuser power.
	 *	- require strict serialization.
	 *	- return a value
	 */
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSIFNAME:
		dev_load(net, ifr->ifr_name);
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;
		rtnl_lock();
		ret = dev_ifsioc(net, ifr, cmd);
		rtnl_unlock();
		if (colon)
			*colon = ':';
		return ret;

	/*
	 *	These ioctl calls:
	 *	- require superuser power.
	 *	- require strict serialization.
	 *	- do not return a value
	 */
	case SIOCSIFMAP:
	case SIOCSIFTXQLEN:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		/* fall through */
	/*
	 *	These ioctl calls:
	 *	- require local superuser power.
	 *	- require strict serialization.
	 *	- do not return a value
	 */
	case SIOCSIFFLAGS:
	case SIOCSIFMETRIC:
	case SIOCSIFMTU:
	case SIOCSIFHWADDR:
	case SIOCSIFSLAVE:
	case SIOCADDMULTI:
	case SIOCDELMULTI:
	case SIOCSIFHWBROADCAST:
	case SIOCSMIIREG:
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDCHANGEACTIVE:
	case SIOCBRADDIF:
	case SIOCBRDELIF:
	case SIOCSHWTSTAMP:
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;
		/* fall through */
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
		dev_load(net, ifr->ifr_name);
		rtnl_lock();
		ret = dev_ifsioc(net, ifr, cmd);
		rtnl_unlock();
		if (need_copyout)
			*need_copyout = false;
		return ret;

	case SIOCGIFMEM:
		/* Get the per device memory space. We can add this but
		 * currently do not support it */
	case SIOCSIFMEM:
		/* Set the per device memory buffer space.
		 * Not applicable in our case */
	case SIOCSIFLINK:
		return -ENOTTY;

	/*
	 *	Unknown or private ioctl.
	 */
	default:
		if (cmd == SIOCWANDEV ||
		    cmd == SIOCGHWTSTAMP ||
		    (cmd >= SIOCDEVPRIVATE &&
		     cmd <= SIOCDEVPRIVATE + 15)) {
			dev_load(net, ifr->ifr_name);
			rtnl_lock();
			ret = dev_ifsioc(net, ifr, cmd);
			rtnl_unlock();
			return ret;
		}
		return -ENOTTY;
	}
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
96b45cbd CW	2	#include <linux/kmod.h>
	3	#include <linux/netdevice.h>
	4	#include <linux/etherdevice.h>
	5	#include <linux/rtnetlink.h>
	6	#include <linux/net_tstamp.h>
	7	#include <linux/wireless.h>
	8	#include <net/wext.h>
	9
	10	/*
	11	* Map an interface index to its name (SIOCGIFNAME)
	12	*/
	13
	14	/*
	15	* We need this ioctl for efficient implementation of the
	16	* if_indextoname() function required by the IPv6 API. Without
	17	* it, we would have to search all the interfaces to find a
	18	* match. --pb
	19	*/
	20
44c02a2c	21	static int dev_ifname(struct net net, struct ifreq ifr)
96b45cbd	22	{
44c02a2c AV	23	ifr->ifr_name[IFNAMSIZ-1] = 0;
44c02a2c AV	24	return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
96b45cbd CW	25	}
	26
	27	static gifconf_func_t *gifconf_list[NPROTO];
	28
	29	/**
	30	* register_gifconf - register a SIOCGIF handler
	31	* @family: Address family
	32	* @gifconf: Function handler
	33	*
	34	* Register protocol dependent address dumping routines. The handler
	35	* that is passed must not be freed or reused until it has been replaced
	36	* by another handler.
	37	*/
	38	int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
	39	{
	40	if (family >= NPROTO)
	41	return -EINVAL;
	42	gifconf_list[family] = gifconf;
	43	return 0;
	44	}
	45	EXPORT_SYMBOL(register_gifconf);
	46
	47	/*
	48	* Perform a SIOCGIFCONF call. This structure will change
	49	* size eventually, and there is nothing I can do about it.
	50	* Thus we will need a 'compatibility mode'.
	51	*/
	52
36fd633e	53	int dev_ifconf(struct net net, struct ifconf ifc, int size)
96b45cbd	54	{
96b45cbd CW	55	struct net_device *dev;
	56	char __user *pos;
	57	int len;
	58	int total;
	59	int i;
	60
	61	/*
	62	* Fetch the caller's info block.
	63	*/
	64
36fd633e AV	65	pos = ifc->ifc_buf;
36fd633e AV	66	len = ifc->ifc_len;
96b45cbd CW	67
	68	/*
	69	* Loop over the interfaces, and write an info block for each.
	70	*/
	71
	72	total = 0;
	73	for_each_netdev(net, dev) {
	74	for (i = 0; i < NPROTO; i++) {
	75	if (gifconf_list[i]) {
	76	int done;
	77	if (!pos)
36fd633e	78	done = gifconf_list[i](dev, NULL, 0, size);
96b45cbd CW	79	else
96b45cbd CW	80	done = gifconf_list[i](dev, pos + total,
36fd633e	81	len - total, size);
96b45cbd CW	82	if (done < 0)
	83	return -EFAULT;
	84	total += done;
	85	}
	86	}
	87	}
	88
	89	/*
	90	* All done. Write the updated control block back to the caller.
	91	*/
36fd633e	92	ifc->ifc_len = total;
96b45cbd CW	93
	94	/*
	95	* Both BSD and Solaris return 0 here, so we do too.
	96	*/
36fd633e	97	return 0;
96b45cbd CW	98	}
	99
	100	/*
	101	* Perform the SIOCxIFxxx calls, inside rcu_read_lock()
	102	*/
	103	static int dev_ifsioc_locked(struct net net, struct ifreq ifr, unsigned int cmd)
	104	{
	105	int err;
	106	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
	107
	108	if (!dev)
	109	return -ENODEV;
	110
	111	switch (cmd) {
	112	case SIOCGIFFLAGS: /* Get interface flags */
	113	ifr->ifr_flags = (short) dev_get_flags(dev);
	114	return 0;
	115
	116	case SIOCGIFMETRIC: /* Get the metric on the interface
	117	(currently unused) */
	118	ifr->ifr_metric = 0;
	119	return 0;
	120
	121	case SIOCGIFMTU: /* Get the MTU of a device */
	122	ifr->ifr_mtu = dev->mtu;
	123	return 0;
	124
	125	case SIOCGIFHWADDR:
	126	if (!dev->addr_len)
54aeba7f FF	127	memset(ifr->ifr_hwaddr.sa_data, 0,
54aeba7f FF	128	sizeof(ifr->ifr_hwaddr.sa_data));
96b45cbd CW	129	else
96b45cbd CW	130	memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
54aeba7f FF	131	min(sizeof(ifr->ifr_hwaddr.sa_data),
54aeba7f FF	132	(size_t)dev->addr_len));
96b45cbd CW	133	ifr->ifr_hwaddr.sa_family = dev->type;
	134	return 0;
	135
	136	case SIOCGIFSLAVE:
	137	err = -EINVAL;
	138	break;
	139
	140	case SIOCGIFMAP:
	141	ifr->ifr_map.mem_start = dev->mem_start;
	142	ifr->ifr_map.mem_end = dev->mem_end;
	143	ifr->ifr_map.base_addr = dev->base_addr;
	144	ifr->ifr_map.irq = dev->irq;
	145	ifr->ifr_map.dma = dev->dma;
	146	ifr->ifr_map.port = dev->if_port;
	147	return 0;
	148
	149	case SIOCGIFINDEX:
	150	ifr->ifr_ifindex = dev->ifindex;
	151	return 0;
	152
	153	case SIOCGIFTXQLEN:
	154	ifr->ifr_qlen = dev->tx_queue_len;
	155	return 0;
	156
	157	default:
	158	/* dev_ioctl() should ensure this case
	159	* is never reached
	160	*/
	161	WARN_ON(1);
	162	err = -ENOTTY;
	163	break;
	164
	165	}
	166	return err;
	167	}
	168
	169	static int net_hwtstamp_validate(struct ifreq *ifr)
	170	{
	171	struct hwtstamp_config cfg;
	172	enum hwtstamp_tx_types tx_type;
	173	enum hwtstamp_rx_filters rx_filter;
	174	int tx_type_valid = 0;
	175	int rx_filter_valid = 0;
	176
	177	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
	178	return -EFAULT;
	179
	180	if (cfg.flags) /* reserved for future extensions */
	181	return -EINVAL;
	182
	183	tx_type = cfg.tx_type;
	184	rx_filter = cfg.rx_filter;
	185
	186	switch (tx_type) {
	187	case HWTSTAMP_TX_OFF:
	188	case HWTSTAMP_TX_ON:
	189	case HWTSTAMP_TX_ONESTEP_SYNC:
	190	tx_type_valid = 1;
	191	break;
	192	}
	193
	194	switch (rx_filter) {
	195	case HWTSTAMP_FILTER_NONE:
	196	case HWTSTAMP_FILTER_ALL:
197	case HWTSTAMP_FILTER_SOME:
198	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
199	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
200	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
201	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
202	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
203	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
204	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
205	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
206	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
207	case HWTSTAMP_FILTER_PTP_V2_EVENT:
208	case HWTSTAMP_FILTER_PTP_V2_SYNC:
209	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
b8210a9e	210	case HWTSTAMP_FILTER_NTP_ALL:
e3412575	211	rx_filter_valid = 1;
b8210a9e	212	break;
96b45cbd CW	213	}
	214
	215	if (!tx_type_valid \|\| !rx_filter_valid)
	216	return -ERANGE;
	217
	218	return 0;
	219	}
	220
	221	/*
	222	* Perform the SIOCxIFxxx calls, inside rtnl_lock()
	223	*/
	224	static int dev_ifsioc(struct net net, struct ifreq ifr, unsigned int cmd)
	225	{
	226	int err;
	227	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
	228	const struct net_device_ops *ops;
	229
	230	if (!dev)
	231	return -ENODEV;
	232
	233	ops = dev->netdev_ops;
	234
	235	switch (cmd) {
	236	case SIOCSIFFLAGS: /* Set interface flags */
567c5e13	237	return dev_change_flags(dev, ifr->ifr_flags, NULL);
96b45cbd CW	238
	239	case SIOCSIFMETRIC: /* Set the metric on the interface
	240	(currently unused) */
	241	return -EOPNOTSUPP;
	242
	243	case SIOCSIFMTU: /* Set the MTU of a device */
	244	return dev_set_mtu(dev, ifr->ifr_mtu);
	245
	246	case SIOCSIFHWADDR:
0254e0c6 WC	247	if (dev->addr_len > sizeof(struct sockaddr))
0254e0c6 WC	248	return -EINVAL;
3a37a963	249	return dev_set_mac_address(dev, &ifr->ifr_hwaddr, NULL);
96b45cbd CW	250
	251	case SIOCSIFHWBROADCAST:
	252	if (ifr->ifr_hwaddr.sa_family != dev->type)
	253	return -EINVAL;
	254	memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
54aeba7f FF	255	min(sizeof(ifr->ifr_hwaddr.sa_data),
54aeba7f FF	256	(size_t)dev->addr_len));
96b45cbd CW	257	call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
	258	return 0;
	259
	260	case SIOCSIFMAP:
	261	if (ops->ndo_set_config) {
	262	if (!netif_device_present(dev))
	263	return -ENODEV;
	264	return ops->ndo_set_config(dev, &ifr->ifr_map);
	265	}
	266	return -EOPNOTSUPP;
	267
	268	case SIOCADDMULTI:
	269	if (!ops->ndo_set_rx_mode \|\|
	270	ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
	271	return -EINVAL;
	272	if (!netif_device_present(dev))
	273	return -ENODEV;
	274	return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
	275
	276	case SIOCDELMULTI:
	277	if (!ops->ndo_set_rx_mode \|\|
	278	ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
	279	return -EINVAL;
	280	if (!netif_device_present(dev))
	281	return -ENODEV;
	282	return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
	283
	284	case SIOCSIFTXQLEN:
	285	if (ifr->ifr_qlen < 0)
	286	return -EINVAL;
8dd30201	287	return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
96b45cbd CW	288
	289	case SIOCSIFNAME:
	290	ifr->ifr_newname[IFNAMSIZ-1] = '\0';
	291	return dev_change_name(dev, ifr->ifr_newname);
	292
	293	case SIOCSHWTSTAMP:
	294	err = net_hwtstamp_validate(ifr);
	295	if (err)
	296	return err;
	297	/* fall through */
	298
	299	/*
	300	* Unknown or private ioctl
	301	*/
	302	default:
	303	if ((cmd >= SIOCDEVPRIVATE &&
	304	cmd <= SIOCDEVPRIVATE + 15) \|\|
	305	cmd == SIOCBONDENSLAVE \|\|
	306	cmd == SIOCBONDRELEASE \|\|
	307	cmd == SIOCBONDSETHWADDR \|\|
	308	cmd == SIOCBONDSLAVEINFOQUERY \|\|
	309	cmd == SIOCBONDINFOQUERY \|\|
	310	cmd == SIOCBONDCHANGEACTIVE \|\|
	311	cmd == SIOCGMIIPHY \|\|
	312	cmd == SIOCGMIIREG \|\|
	313	cmd == SIOCSMIIREG \|\|
	314	cmd == SIOCBRADDIF \|\|
	315	cmd == SIOCBRDELIF \|\|
	316	cmd == SIOCSHWTSTAMP \|\|
fd468c74	317	cmd == SIOCGHWTSTAMP \|\|
96b45cbd CW	318	cmd == SIOCWANDEV) {
	319	err = -EOPNOTSUPP;
	320	if (ops->ndo_do_ioctl) {
	321	if (netif_device_present(dev))
	322	err = ops->ndo_do_ioctl(dev, ifr, cmd);
	323	else
	324	err = -ENODEV;
	325	}
	326	} else
	327	err = -EINVAL;
	328
	329	}
	330	return err;
	331	}
	332
	333	/**
	334	* dev_load - load a network module
	335	* @net: the applicable net namespace
	336	* @name: name of interface
	337	*
	338	* If a network interface is not present and the process has suitable
	339	* privileges this function loads the module. If module loading is not
	340	* available in this kernel then it becomes a nop.
	341	*/
	342
	343	void dev_load(struct net net, const char name)
	344	{
	345	struct net_device *dev;
	346	int no_module;
	347
	348	rcu_read_lock();
	349	dev = dev_get_by_name_rcu(net, name);
	350	rcu_read_unlock();
	351
	352	no_module = !dev;
	353	if (no_module && capable(CAP_NET_ADMIN))
	354	no_module = request_module("netdev-%s", name);
e020836d DB	355	if (no_module && capable(CAP_SYS_MODULE))
e020836d DB	356	request_module("%s", name);
96b45cbd CW	357	}
	358	EXPORT_SYMBOL(dev_load);
	359
	360	/*
	361	* This function handles all "interface"-type I/O control requests. The actual
	362	* 'doing' part of this is dev_ifsioc above.
	363	*/
	364
	365	/**
	366	* dev_ioctl - network device ioctl
	367	* @net: the applicable net namespace
	368	* @cmd: command to issue
b3c0fd61 BVA	369	* @ifr: pointer to a struct ifreq in user space
b3c0fd61 BVA	370	* @need_copyout: whether or not copy_to_user() should be called
96b45cbd CW	371	*
	372	* Issue ioctl functions to devices. This is normally called by the
	373	* user space syscall interfaces but can sometimes be useful for
	374	* other purposes. The return value is the return from the syscall if
	375	* positive or a negative errno code on error.
	376	*/
	377
44c02a2c	378	int dev_ioctl(struct net net, unsigned int cmd, struct ifreq ifr, bool *need_copyout)
96b45cbd	379	{
96b45cbd CW	380	int ret;
	381	char *colon;
	382
44c02a2c AV	383	if (need_copyout)
44c02a2c AV	384	*need_copyout = true;
96b45cbd	385	if (cmd == SIOCGIFNAME)
44c02a2c	386	return dev_ifname(net, ifr);
96b45cbd	387
44c02a2c	388	ifr->ifr_name[IFNAMSIZ-1] = 0;
96b45cbd	389
44c02a2c	390	colon = strchr(ifr->ifr_name, ':');
96b45cbd CW	391	if (colon)
	392	*colon = 0;
	393
	394	/*
	395	* See which interface the caller is talking about.
	396	*/
	397
	398	switch (cmd) {
	399	/*
	400	* These ioctl calls:
	401	* - can be done by all.
	402	* - atomic and do not require locking.
	403	* - return a value
	404	*/
	405	case SIOCGIFFLAGS:
	406	case SIOCGIFMETRIC:
	407	case SIOCGIFMTU:
	408	case SIOCGIFHWADDR:
	409	case SIOCGIFSLAVE:
	410	case SIOCGIFMAP:
	411	case SIOCGIFINDEX:
	412	case SIOCGIFTXQLEN:
b51f26b1	413	dev_load(net, ifr->ifr_name);
96b45cbd	414	rcu_read_lock();
44c02a2c	415	ret = dev_ifsioc_locked(net, ifr, cmd);
96b45cbd	416	rcu_read_unlock();
44c02a2c AV	417	if (colon)
44c02a2c AV	418	*colon = ':';
96b45cbd CW	419	return ret;
	420
	421	case SIOCETHTOOL:
b51f26b1	422	dev_load(net, ifr->ifr_name);
96b45cbd	423	rtnl_lock();
44c02a2c	424	ret = dev_ethtool(net, ifr);
96b45cbd	425	rtnl_unlock();
44c02a2c AV	426	if (colon)
44c02a2c AV	427	*colon = ':';
96b45cbd CW	428	return ret;
	429
	430	/*
	431	* These ioctl calls:
	432	* - require superuser power.
	433	* - require strict serialization.
	434	* - return a value
	435	*/
	436	case SIOCGMIIPHY:
	437	case SIOCGMIIREG:
	438	case SIOCSIFNAME:
b51f26b1	439	dev_load(net, ifr->ifr_name);
96b45cbd CW	440	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
96b45cbd CW	441	return -EPERM;
96b45cbd	442	rtnl_lock();
44c02a2c	443	ret = dev_ifsioc(net, ifr, cmd);
96b45cbd	444	rtnl_unlock();
44c02a2c AV	445	if (colon)
44c02a2c AV	446	*colon = ':';
96b45cbd CW	447	return ret;
	448
	449	/*
	450	* These ioctl calls:
	451	* - require superuser power.
	452	* - require strict serialization.
	453	* - do not return a value
	454	*/
	455	case SIOCSIFMAP:
	456	case SIOCSIFTXQLEN:
	457	if (!capable(CAP_NET_ADMIN))
	458	return -EPERM;
	459	/* fall through */
	460	/*
	461	* These ioctl calls:
	462	* - require local superuser power.
	463	* - require strict serialization.
	464	* - do not return a value
	465	*/
	466	case SIOCSIFFLAGS:
	467	case SIOCSIFMETRIC:
	468	case SIOCSIFMTU:
	469	case SIOCSIFHWADDR:
	470	case SIOCSIFSLAVE:
	471	case SIOCADDMULTI:
	472	case SIOCDELMULTI:
	473	case SIOCSIFHWBROADCAST:
	474	case SIOCSMIIREG:
	475	case SIOCBONDENSLAVE:
	476	case SIOCBONDRELEASE:
	477	case SIOCBONDSETHWADDR:
	478	case SIOCBONDCHANGEACTIVE:
	479	case SIOCBRADDIF:
	480	case SIOCBRDELIF:
	481	case SIOCSHWTSTAMP:
	482	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
	483	return -EPERM;
	484	/* fall through */
	485	case SIOCBONDSLAVEINFOQUERY:
	486	case SIOCBONDINFOQUERY:
b51f26b1	487	dev_load(net, ifr->ifr_name);
96b45cbd	488	rtnl_lock();
44c02a2c	489	ret = dev_ifsioc(net, ifr, cmd);
96b45cbd	490	rtnl_unlock();
44c02a2c AV	491	if (need_copyout)
44c02a2c AV	492	*need_copyout = false;
96b45cbd CW	493	return ret;
	494
	495	case SIOCGIFMEM:
	496	/* Get the per device memory space. We can add this but
	497	* currently do not support it */
	498	case SIOCSIFMEM:
	499	/* Set the per device memory buffer space.
	500	* Not applicable in our case */
	501	case SIOCSIFLINK:
	502	return -ENOTTY;
	503
	504	/*
	505	* Unknown or private ioctl.
	506	*/
	507	default:
	508	if (cmd == SIOCWANDEV \|\|
fd468c74	509	cmd == SIOCGHWTSTAMP \|\|
96b45cbd CW	510	(cmd >= SIOCDEVPRIVATE &&
96b45cbd CW	511	cmd <= SIOCDEVPRIVATE + 15)) {
b51f26b1	512	dev_load(net, ifr->ifr_name);
96b45cbd	513	rtnl_lock();
44c02a2c	514	ret = dev_ifsioc(net, ifr, cmd);
96b45cbd	515	rtnl_unlock();
96b45cbd CW	516	return ret;
96b45cbd CW	517	}
96b45cbd CW	518	return -ENOTTY;
	519	}
	520	}