[linux.git] / net / core / dev_ioctl.c

#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 __user *arg)
{
	struct ifreq ifr;
	int error;

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

	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
		return -EFAULT;

	error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
	if (error)
		return error;

	if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
		return -EFAULT;
	return 0;
}

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'.
 */

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

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

	if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
		return -EFAULT;

	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);
				else
					done = gifconf_list[i](dev, pos + total,
							       len - total);
				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 copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 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:
		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);

	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:
		return dev_set_mac_address(dev, &ifr->ifr_hwaddr);

	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;
		dev->tx_queue_len = ifr->ifr_qlen;
		return 0;

	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
 *	@arg: pointer to a struct ifreq in user space
 *
 *	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, void __user *arg)
{
	struct ifreq ifr;
	int ret;
	char *colon;

	/* One special case: SIOCGIFCONF takes ifconf argument
	   and requires shared lock, because it sleeps writing
	   to user space.
	 */

	if (cmd == SIOCGIFCONF) {
		rtnl_lock();
		ret = dev_ifconf(net, (char __user *) arg);
		rtnl_unlock();
		return ret;
	}
	if (cmd == SIOCGIFNAME)
		return dev_ifname(net, (struct ifreq __user *)arg);

	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
		return -EFAULT;

	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 (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;

	case SIOCETHTOOL:
		dev_load(net, ifr.ifr_name);
		rtnl_lock();
		ret = dev_ethtool(net, &ifr);
		rtnl_unlock();
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;

	/*
	 *	These ioctl calls:
	 *	- require superuser power.
	 *	- require strict serialization.
	 *	- return a value
	 */
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSIFNAME:
		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
			return -EPERM;
		dev_load(net, ifr.ifr_name);
		rtnl_lock();
		ret = dev_ifsioc(net, &ifr, cmd);
		rtnl_unlock();
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		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();
		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();
			if (!ret && copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
				ret = -EFAULT;
			return ret;
		}
		/* Take care of Wireless Extensions */
		if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
			return wext_handle_ioctl(net, &ifr, cmd, arg);
		return -ENOTTY;
	}
}
Commit	Line	Data
96b45cbd CW	1	#include <linux/kmod.h>
	2	#include <linux/netdevice.h>
	3	#include <linux/etherdevice.h>
	4	#include <linux/rtnetlink.h>
	5	#include <linux/net_tstamp.h>
	6	#include <linux/wireless.h>
	7	#include <net/wext.h>
	8
	9	/*
	10	* Map an interface index to its name (SIOCGIFNAME)
	11	*/
	12
	13	/*
	14	* We need this ioctl for efficient implementation of the
	15	* if_indextoname() function required by the IPv6 API. Without
	16	* it, we would have to search all the interfaces to find a
	17	* match. --pb
	18	*/
	19
	20	static int dev_ifname(struct net net, struct ifreq __user arg)
	21	{
96b45cbd	22	struct ifreq ifr;
5dbe7c17	23	int error;
96b45cbd CW	24
	25	/*
	26	* Fetch the caller's info block.
	27	*/
	28
	29	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
	30	return -EFAULT;
	31
5dbe7c17 NS	32	error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
	33	if (error)
	34	return error;
96b45cbd CW	35
	36	if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
	37	return -EFAULT;
	38	return 0;
	39	}
	40
	41	static gifconf_func_t *gifconf_list[NPROTO];
	42
	43	/**
	44	* register_gifconf - register a SIOCGIF handler
	45	* @family: Address family
	46	* @gifconf: Function handler
	47	*
	48	* Register protocol dependent address dumping routines. The handler
	49	* that is passed must not be freed or reused until it has been replaced
	50	* by another handler.
	51	*/
	52	int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
	53	{
	54	if (family >= NPROTO)
	55	return -EINVAL;
	56	gifconf_list[family] = gifconf;
	57	return 0;
	58	}
	59	EXPORT_SYMBOL(register_gifconf);
	60
	61	/*
	62	* Perform a SIOCGIFCONF call. This structure will change
	63	* size eventually, and there is nothing I can do about it.
	64	* Thus we will need a 'compatibility mode'.
	65	*/
	66
	67	static int dev_ifconf(struct net net, char __user arg)
	68	{
	69	struct ifconf ifc;
	70	struct net_device *dev;
	71	char __user *pos;
	72	int len;
	73	int total;
	74	int i;
	75
	76	/*
	77	* Fetch the caller's info block.
	78	*/
	79
	80	if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
	81	return -EFAULT;
	82
	83	pos = ifc.ifc_buf;
	84	len = ifc.ifc_len;
	85
	86	/*
	87	* Loop over the interfaces, and write an info block for each.
	88	*/
	89
	90	total = 0;
	91	for_each_netdev(net, dev) {
	92	for (i = 0; i < NPROTO; i++) {
	93	if (gifconf_list[i]) {
	94	int done;
	95	if (!pos)
	96	done = gifconf_list[i](dev, NULL, 0);
	97	else
	98	done = gifconf_list[i](dev, pos + total,
99	len - total);
100	if (done < 0)
101	return -EFAULT;
102	total += done;
103	}
104	}
105	}
106
107	/*
108	* All done. Write the updated control block back to the caller.
109	*/
110	ifc.ifc_len = total;
111
112	/*
113	* Both BSD and Solaris return 0 here, so we do too.
114	*/
115	return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
116	}
117
118	/*
119	* Perform the SIOCxIFxxx calls, inside rcu_read_lock()
120	*/
121	static int dev_ifsioc_locked(struct net net, struct ifreq ifr, unsigned int cmd)
122	{
123	int err;
124	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
125
126	if (!dev)
127	return -ENODEV;
128
129	switch (cmd) {
130	case SIOCGIFFLAGS: /* Get interface flags */
131	ifr->ifr_flags = (short) dev_get_flags(dev);
132	return 0;
133
134	case SIOCGIFMETRIC: /* Get the metric on the interface
135	(currently unused) */
136	ifr->ifr_metric = 0;
137	return 0;
138
139	case SIOCGIFMTU: /* Get the MTU of a device */
140	ifr->ifr_mtu = dev->mtu;
141	return 0;
142
143	case SIOCGIFHWADDR:
144	if (!dev->addr_len)
54aeba7f FF	145	memset(ifr->ifr_hwaddr.sa_data, 0,
54aeba7f FF	146	sizeof(ifr->ifr_hwaddr.sa_data));
96b45cbd CW	147	else
96b45cbd CW	148	memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
54aeba7f FF	149	min(sizeof(ifr->ifr_hwaddr.sa_data),
54aeba7f FF	150	(size_t)dev->addr_len));
96b45cbd CW	151	ifr->ifr_hwaddr.sa_family = dev->type;
	152	return 0;
	153
	154	case SIOCGIFSLAVE:
	155	err = -EINVAL;
	156	break;
	157
	158	case SIOCGIFMAP:
	159	ifr->ifr_map.mem_start = dev->mem_start;
	160	ifr->ifr_map.mem_end = dev->mem_end;
	161	ifr->ifr_map.base_addr = dev->base_addr;
	162	ifr->ifr_map.irq = dev->irq;
	163	ifr->ifr_map.dma = dev->dma;
	164	ifr->ifr_map.port = dev->if_port;
	165	return 0;
	166
	167	case SIOCGIFINDEX:
	168	ifr->ifr_ifindex = dev->ifindex;
	169	return 0;
	170
	171	case SIOCGIFTXQLEN:
	172	ifr->ifr_qlen = dev->tx_queue_len;
	173	return 0;
	174
	175	default:
	176	/* dev_ioctl() should ensure this case
	177	* is never reached
	178	*/
	179	WARN_ON(1);
	180	err = -ENOTTY;
	181	break;
	182
	183	}
	184	return err;
	185	}
	186
	187	static int net_hwtstamp_validate(struct ifreq *ifr)
	188	{
	189	struct hwtstamp_config cfg;
	190	enum hwtstamp_tx_types tx_type;
	191	enum hwtstamp_rx_filters rx_filter;
	192	int tx_type_valid = 0;
	193	int rx_filter_valid = 0;
	194
	195	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
	196	return -EFAULT;
	197
	198	if (cfg.flags) /* reserved for future extensions */
	199	return -EINVAL;
	200
	201	tx_type = cfg.tx_type;
	202	rx_filter = cfg.rx_filter;
	203
	204	switch (tx_type) {
	205	case HWTSTAMP_TX_OFF:
	206	case HWTSTAMP_TX_ON:
	207	case HWTSTAMP_TX_ONESTEP_SYNC:
	208	tx_type_valid = 1;
	209	break;
	210	}
	211
	212	switch (rx_filter) {
	213	case HWTSTAMP_FILTER_NONE:
	214	case HWTSTAMP_FILTER_ALL:
215	case HWTSTAMP_FILTER_SOME:
216	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
217	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
218	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
219	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
220	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
221	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
222	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
223	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
224	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
225	case HWTSTAMP_FILTER_PTP_V2_EVENT:
226	case HWTSTAMP_FILTER_PTP_V2_SYNC:
227	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
228	rx_filter_valid = 1;
229	break;
230	}
231
232	if (!tx_type_valid \|\| !rx_filter_valid)
233	return -ERANGE;
234
235	return 0;
236	}
237
238	/*
239	* Perform the SIOCxIFxxx calls, inside rtnl_lock()
240	*/
241	static int dev_ifsioc(struct net net, struct ifreq ifr, unsigned int cmd)
242	{
243	int err;
244	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
245	const struct net_device_ops *ops;
246
247	if (!dev)
248	return -ENODEV;
249
250	ops = dev->netdev_ops;
251
252	switch (cmd) {
253	case SIOCSIFFLAGS: /* Set interface flags */
254	return dev_change_flags(dev, ifr->ifr_flags);
255
256	case SIOCSIFMETRIC: /* Set the metric on the interface
257	(currently unused) */
258	return -EOPNOTSUPP;
259
260	case SIOCSIFMTU: /* Set the MTU of a device */
261	return dev_set_mtu(dev, ifr->ifr_mtu);
262
263	case SIOCSIFHWADDR:
264	return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
265
266	case SIOCSIFHWBROADCAST:
267	if (ifr->ifr_hwaddr.sa_family != dev->type)
268	return -EINVAL;
269	memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
54aeba7f FF	270	min(sizeof(ifr->ifr_hwaddr.sa_data),
54aeba7f FF	271	(size_t)dev->addr_len));
96b45cbd CW	272	call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
	273	return 0;
	274
	275	case SIOCSIFMAP:
	276	if (ops->ndo_set_config) {
	277	if (!netif_device_present(dev))
	278	return -ENODEV;
	279	return ops->ndo_set_config(dev, &ifr->ifr_map);
	280	}
	281	return -EOPNOTSUPP;
	282
	283	case SIOCADDMULTI:
	284	if (!ops->ndo_set_rx_mode \|\|
	285	ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
	286	return -EINVAL;
	287	if (!netif_device_present(dev))
	288	return -ENODEV;
	289	return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
	290
	291	case SIOCDELMULTI:
	292	if (!ops->ndo_set_rx_mode \|\|
	293	ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
	294	return -EINVAL;
	295	if (!netif_device_present(dev))
	296	return -ENODEV;
	297	return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
	298
	299	case SIOCSIFTXQLEN:
	300	if (ifr->ifr_qlen < 0)
	301	return -EINVAL;
	302	dev->tx_queue_len = ifr->ifr_qlen;
	303	return 0;
	304
	305	case SIOCSIFNAME:
	306	ifr->ifr_newname[IFNAMSIZ-1] = '\0';
	307	return dev_change_name(dev, ifr->ifr_newname);
	308
	309	case SIOCSHWTSTAMP:
	310	err = net_hwtstamp_validate(ifr);
	311	if (err)
	312	return err;
	313	/* fall through */
	314
	315	/*
	316	* Unknown or private ioctl
	317	*/
	318	default:
	319	if ((cmd >= SIOCDEVPRIVATE &&
	320	cmd <= SIOCDEVPRIVATE + 15) \|\|
	321	cmd == SIOCBONDENSLAVE \|\|
	322	cmd == SIOCBONDRELEASE \|\|
	323	cmd == SIOCBONDSETHWADDR \|\|
	324	cmd == SIOCBONDSLAVEINFOQUERY \|\|
	325	cmd == SIOCBONDINFOQUERY \|\|
	326	cmd == SIOCBONDCHANGEACTIVE \|\|
	327	cmd == SIOCGMIIPHY \|\|
	328	cmd == SIOCGMIIREG \|\|
	329	cmd == SIOCSMIIREG \|\|
	330	cmd == SIOCBRADDIF \|\|
	331	cmd == SIOCBRDELIF \|\|
	332	cmd == SIOCSHWTSTAMP \|\|
fd468c74	333	cmd == SIOCGHWTSTAMP \|\|
96b45cbd CW	334	cmd == SIOCWANDEV) {
	335	err = -EOPNOTSUPP;
	336	if (ops->ndo_do_ioctl) {
	337	if (netif_device_present(dev))
	338	err = ops->ndo_do_ioctl(dev, ifr, cmd);
	339	else
	340	err = -ENODEV;
	341	}
	342	} else
	343	err = -EINVAL;
	344
	345	}
	346	return err;
	347	}
	348
	349	/**
	350	* dev_load - load a network module
	351	* @net: the applicable net namespace
	352	* @name: name of interface
	353	*
	354	* If a network interface is not present and the process has suitable
	355	* privileges this function loads the module. If module loading is not
	356	* available in this kernel then it becomes a nop.
	357	*/
	358
	359	void dev_load(struct net net, const char name)
	360	{
	361	struct net_device *dev;
	362	int no_module;
	363
	364	rcu_read_lock();
	365	dev = dev_get_by_name_rcu(net, name);
	366	rcu_read_unlock();
	367
	368	no_module = !dev;
	369	if (no_module && capable(CAP_NET_ADMIN))
	370	no_module = request_module("netdev-%s", name);
e020836d DB	371	if (no_module && capable(CAP_SYS_MODULE))
e020836d DB	372	request_module("%s", name);
96b45cbd CW	373	}
	374	EXPORT_SYMBOL(dev_load);
	375
	376	/*
	377	* This function handles all "interface"-type I/O control requests. The actual
	378	* 'doing' part of this is dev_ifsioc above.
	379	*/
	380
	381	/**
	382	* dev_ioctl - network device ioctl
	383	* @net: the applicable net namespace
	384	* @cmd: command to issue
	385	* @arg: pointer to a struct ifreq in user space
	386	*
	387	* Issue ioctl functions to devices. This is normally called by the
	388	* user space syscall interfaces but can sometimes be useful for
	389	* other purposes. The return value is the return from the syscall if
	390	* positive or a negative errno code on error.
	391	*/
	392
	393	int dev_ioctl(struct net net, unsigned int cmd, void __user arg)
	394	{
	395	struct ifreq ifr;
	396	int ret;
	397	char *colon;
	398
	399	/* One special case: SIOCGIFCONF takes ifconf argument
	400	and requires shared lock, because it sleeps writing
	401	to user space.
	402	*/
	403
	404	if (cmd == SIOCGIFCONF) {
	405	rtnl_lock();
	406	ret = dev_ifconf(net, (char __user *) arg);
	407	rtnl_unlock();
	408	return ret;
	409	}
	410	if (cmd == SIOCGIFNAME)
	411	return dev_ifname(net, (struct ifreq __user *)arg);
	412
	413	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
	414	return -EFAULT;
	415
	416	ifr.ifr_name[IFNAMSIZ-1] = 0;
	417
	418	colon = strchr(ifr.ifr_name, ':');
	419	if (colon)
	420	*colon = 0;
	421
	422	/*
	423	* See which interface the caller is talking about.
	424	*/
	425
	426	switch (cmd) {
	427	/*
	428	* These ioctl calls:
	429	* - can be done by all.
	430	* - atomic and do not require locking.
	431	* - return a value
	432	*/
	433	case SIOCGIFFLAGS:
	434	case SIOCGIFMETRIC:
	435	case SIOCGIFMTU:
	436	case SIOCGIFHWADDR:
437	case SIOCGIFSLAVE:
438	case SIOCGIFMAP:
439	case SIOCGIFINDEX:
440	case SIOCGIFTXQLEN:
441	dev_load(net, ifr.ifr_name);
442	rcu_read_lock();
443	ret = dev_ifsioc_locked(net, &ifr, cmd);
444	rcu_read_unlock();
445	if (!ret) {
446	if (colon)
447	*colon = ':';
448	if (copy_to_user(arg, &ifr,
449	sizeof(struct ifreq)))
450	ret = -EFAULT;
451	}
452	return ret;
453
454	case SIOCETHTOOL:
455	dev_load(net, ifr.ifr_name);
456	rtnl_lock();
457	ret = dev_ethtool(net, &ifr);
458	rtnl_unlock();
459	if (!ret) {
460	if (colon)
461	*colon = ':';
462	if (copy_to_user(arg, &ifr,
463	sizeof(struct ifreq)))
464	ret = -EFAULT;
465	}
466	return ret;
467
468	/*
469	* These ioctl calls:
470	* - require superuser power.
471	* - require strict serialization.
472	* - return a value
473	*/
474	case SIOCGMIIPHY:
475	case SIOCGMIIREG:
476	case SIOCSIFNAME:
477	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
478	return -EPERM;
479	dev_load(net, ifr.ifr_name);
480	rtnl_lock();
481	ret = dev_ifsioc(net, &ifr, cmd);
482	rtnl_unlock();
483	if (!ret) {
484	if (colon)
485	*colon = ':';
486	if (copy_to_user(arg, &ifr,
487	sizeof(struct ifreq)))
488	ret = -EFAULT;
489	}
490	return ret;
491
492	/*
493	* These ioctl calls:
494	* - require superuser power.
495	* - require strict serialization.
496	* - do not return a value
497	*/
498	case SIOCSIFMAP:
499	case SIOCSIFTXQLEN:
500	if (!capable(CAP_NET_ADMIN))
501	return -EPERM;
502	/* fall through */
503	/*
504	* These ioctl calls:
505	* - require local superuser power.
506	* - require strict serialization.
507	* - do not return a value
508	*/
509	case SIOCSIFFLAGS:
510	case SIOCSIFMETRIC:
511	case SIOCSIFMTU:
512	case SIOCSIFHWADDR:
513	case SIOCSIFSLAVE:
514	case SIOCADDMULTI:
515	case SIOCDELMULTI:
516	case SIOCSIFHWBROADCAST:
517	case SIOCSMIIREG:
518	case SIOCBONDENSLAVE:
519	case SIOCBONDRELEASE:
520	case SIOCBONDSETHWADDR:
521	case SIOCBONDCHANGEACTIVE:
522	case SIOCBRADDIF:
523	case SIOCBRDELIF:
524	case SIOCSHWTSTAMP:
525	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
526	return -EPERM;
527	/* fall through */
528	case SIOCBONDSLAVEINFOQUERY:
529	case SIOCBONDINFOQUERY:
530	dev_load(net, ifr.ifr_name);
531	rtnl_lock();
532	ret = dev_ifsioc(net, &ifr, cmd);
533	rtnl_unlock();
534	return ret;
535
536	case SIOCGIFMEM:
537	/* Get the per device memory space. We can add this but
538	* currently do not support it */
539	case SIOCSIFMEM:
540	/* Set the per device memory buffer space.
541	* Not applicable in our case */
542	case SIOCSIFLINK:
543	return -ENOTTY;
544
545	/*
546	* Unknown or private ioctl.
547	*/
548	default:
549	if (cmd == SIOCWANDEV \|\|
fd468c74	550	cmd == SIOCGHWTSTAMP \|\|
96b45cbd CW	551	(cmd >= SIOCDEVPRIVATE &&
	552	cmd <= SIOCDEVPRIVATE + 15)) {
	553	dev_load(net, ifr.ifr_name);
	554	rtnl_lock();
	555	ret = dev_ifsioc(net, &ifr, cmd);
	556	rtnl_unlock();
	557	if (!ret && copy_to_user(arg, &ifr,
	558	sizeof(struct ifreq)))
	559	ret = -EFAULT;
	560	return ret;
	561	}
	562	/* Take care of Wireless Extensions */
	563	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
	564	return wext_handle_ioctl(net, &ifr, cmd, arg);
	565	return -ENOTTY;
	566	}
	567	}