[mirror_ubuntu-artful-kernel.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;
	ifr.ifr_name[IFNAMSIZ-1] = 0;

	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:
	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);

	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);

	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);

	/*
	 * Take care of Wireless Extensions. Unfortunately struct iwreq
	 * isn't a proper subset of struct ifreq (it's 8 byte shorter)
	 * so we need to treat it specially, otherwise applications may
	 * fault if the struct they're passing happens to land at the
	 * end of a mapped page.
	 */
	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
		struct iwreq iwr;

		if (copy_from_user(&iwr, arg, sizeof(iwr)))
			return -EFAULT;

		iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;

		return wext_handle_ioctl(net, &iwr, cmd, 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;
		}
		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;
63679112	31	ifr.ifr_name[IFNAMSIZ-1] = 0;
96b45cbd	32
5dbe7c17 NS	33	error = netdev_get_name(net, ifr.ifr_name, ifr.ifr_ifindex);
	34	if (error)
	35	return error;
96b45cbd CW	36
	37	if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
	38	return -EFAULT;
	39	return 0;
	40	}
	41
	42	static gifconf_func_t *gifconf_list[NPROTO];
	43
	44	/**
	45	* register_gifconf - register a SIOCGIF handler
	46	* @family: Address family
	47	* @gifconf: Function handler
	48	*
	49	* Register protocol dependent address dumping routines. The handler
	50	* that is passed must not be freed or reused until it has been replaced
	51	* by another handler.
	52	*/
	53	int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
	54	{
	55	if (family >= NPROTO)
	56	return -EINVAL;
	57	gifconf_list[family] = gifconf;
	58	return 0;
	59	}
	60	EXPORT_SYMBOL(register_gifconf);
	61
	62	/*
	63	* Perform a SIOCGIFCONF call. This structure will change
	64	* size eventually, and there is nothing I can do about it.
	65	* Thus we will need a 'compatibility mode'.
	66	*/
	67
	68	static int dev_ifconf(struct net net, char __user arg)
	69	{
	70	struct ifconf ifc;
	71	struct net_device *dev;
	72	char __user *pos;
	73	int len;
	74	int total;
	75	int i;
	76
	77	/*
	78	* Fetch the caller's info block.
	79	*/
	80
	81	if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
	82	return -EFAULT;
	83
	84	pos = ifc.ifc_buf;
	85	len = ifc.ifc_len;
	86
	87	/*
	88	* Loop over the interfaces, and write an info block for each.
	89	*/
	90
	91	total = 0;
	92	for_each_netdev(net, dev) {
	93	for (i = 0; i < NPROTO; i++) {
	94	if (gifconf_list[i]) {
	95	int done;
	96	if (!pos)
	97	done = gifconf_list[i](dev, NULL, 0);
	98	else
	99	done = gifconf_list[i](dev, pos + total,
100	len - total);
101	if (done < 0)
102	return -EFAULT;
103	total += done;
104	}
105	}
106	}
107
108	/*
109	* All done. Write the updated control block back to the caller.
110	*/
111	ifc.ifc_len = total;
112
113	/*
114	* Both BSD and Solaris return 0 here, so we do too.
115	*/
116	return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
117	}
118
119	/*
120	* Perform the SIOCxIFxxx calls, inside rcu_read_lock()
121	*/
122	static int dev_ifsioc_locked(struct net net, struct ifreq ifr, unsigned int cmd)
123	{
124	int err;
125	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
126
127	if (!dev)
128	return -ENODEV;
129
130	switch (cmd) {
131	case SIOCGIFFLAGS: /* Get interface flags */
132	ifr->ifr_flags = (short) dev_get_flags(dev);
133	return 0;
134
135	case SIOCGIFMETRIC: /* Get the metric on the interface
136	(currently unused) */
137	ifr->ifr_metric = 0;
138	return 0;
139
140	case SIOCGIFMTU: /* Get the MTU of a device */
141	ifr->ifr_mtu = dev->mtu;
142	return 0;
143
144	case SIOCGIFHWADDR:
145	if (!dev->addr_len)
54aeba7f FF	146	memset(ifr->ifr_hwaddr.sa_data, 0,
54aeba7f FF	147	sizeof(ifr->ifr_hwaddr.sa_data));
96b45cbd CW	148	else
96b45cbd CW	149	memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
54aeba7f FF	150	min(sizeof(ifr->ifr_hwaddr.sa_data),
54aeba7f FF	151	(size_t)dev->addr_len));
96b45cbd CW	152	ifr->ifr_hwaddr.sa_family = dev->type;
	153	return 0;
	154
	155	case SIOCGIFSLAVE:
	156	err = -EINVAL;
	157	break;
	158
	159	case SIOCGIFMAP:
	160	ifr->ifr_map.mem_start = dev->mem_start;
	161	ifr->ifr_map.mem_end = dev->mem_end;
	162	ifr->ifr_map.base_addr = dev->base_addr;
	163	ifr->ifr_map.irq = dev->irq;
	164	ifr->ifr_map.dma = dev->dma;
	165	ifr->ifr_map.port = dev->if_port;
	166	return 0;
	167
	168	case SIOCGIFINDEX:
	169	ifr->ifr_ifindex = dev->ifindex;
	170	return 0;
	171
	172	case SIOCGIFTXQLEN:
	173	ifr->ifr_qlen = dev->tx_queue_len;
	174	return 0;
	175
	176	default:
	177	/* dev_ioctl() should ensure this case
	178	* is never reached
	179	*/
	180	WARN_ON(1);
	181	err = -ENOTTY;
	182	break;
	183
	184	}
	185	return err;
	186	}
	187
	188	static int net_hwtstamp_validate(struct ifreq *ifr)
	189	{
	190	struct hwtstamp_config cfg;
	191	enum hwtstamp_tx_types tx_type;
	192	enum hwtstamp_rx_filters rx_filter;
	193	int tx_type_valid = 0;
	194	int rx_filter_valid = 0;
	195
	196	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
	197	return -EFAULT;
	198
	199	if (cfg.flags) /* reserved for future extensions */
	200	return -EINVAL;
	201
	202	tx_type = cfg.tx_type;
	203	rx_filter = cfg.rx_filter;
	204
	205	switch (tx_type) {
	206	case HWTSTAMP_TX_OFF:
	207	case HWTSTAMP_TX_ON:
	208	case HWTSTAMP_TX_ONESTEP_SYNC:
	209	tx_type_valid = 1;
	210	break;
	211	}
	212
	213	switch (rx_filter) {
	214	case HWTSTAMP_FILTER_NONE:
	215	case HWTSTAMP_FILTER_ALL:
216	case HWTSTAMP_FILTER_SOME:
217	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
218	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
219	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
220	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
221	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
222	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
223	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
224	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
225	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
226	case HWTSTAMP_FILTER_PTP_V2_EVENT:
227	case HWTSTAMP_FILTER_PTP_V2_SYNC:
228	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
b8210a9e	229	case HWTSTAMP_FILTER_NTP_ALL:
e3412575	230	rx_filter_valid = 1;
b8210a9e	231	break;
96b45cbd CW	232	}
	233
	234	if (!tx_type_valid \|\| !rx_filter_valid)
	235	return -ERANGE;
	236
	237	return 0;
	238	}
	239
	240	/*
	241	* Perform the SIOCxIFxxx calls, inside rtnl_lock()
	242	*/
	243	static int dev_ifsioc(struct net net, struct ifreq ifr, unsigned int cmd)
	244	{
	245	int err;
	246	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
	247	const struct net_device_ops *ops;
	248
	249	if (!dev)
	250	return -ENODEV;
	251
	252	ops = dev->netdev_ops;
	253
	254	switch (cmd) {
	255	case SIOCSIFFLAGS: /* Set interface flags */
	256	return dev_change_flags(dev, ifr->ifr_flags);
	257
	258	case SIOCSIFMETRIC: /* Set the metric on the interface
	259	(currently unused) */
	260	return -EOPNOTSUPP;
	261
	262	case SIOCSIFMTU: /* Set the MTU of a device */
	263	return dev_set_mtu(dev, ifr->ifr_mtu);
	264
	265	case SIOCSIFHWADDR:
0254e0c6 WC	266	if (dev->addr_len > sizeof(struct sockaddr))
0254e0c6 WC	267	return -EINVAL;
96b45cbd CW	268	return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
	269
	270	case SIOCSIFHWBROADCAST:
	271	if (ifr->ifr_hwaddr.sa_family != dev->type)
	272	return -EINVAL;
	273	memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
54aeba7f FF	274	min(sizeof(ifr->ifr_hwaddr.sa_data),
54aeba7f FF	275	(size_t)dev->addr_len));
96b45cbd CW	276	call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
	277	return 0;
	278
	279	case SIOCSIFMAP:
	280	if (ops->ndo_set_config) {
	281	if (!netif_device_present(dev))
	282	return -ENODEV;
	283	return ops->ndo_set_config(dev, &ifr->ifr_map);
	284	}
	285	return -EOPNOTSUPP;
	286
	287	case SIOCADDMULTI:
	288	if (!ops->ndo_set_rx_mode \|\|
	289	ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
	290	return -EINVAL;
	291	if (!netif_device_present(dev))
	292	return -ENODEV;
	293	return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
	294
	295	case SIOCDELMULTI:
	296	if (!ops->ndo_set_rx_mode \|\|
	297	ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
	298	return -EINVAL;
	299	if (!netif_device_present(dev))
	300	return -ENODEV;
	301	return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
	302
	303	case SIOCSIFTXQLEN:
	304	if (ifr->ifr_qlen < 0)
	305	return -EINVAL;
	306	dev->tx_queue_len = ifr->ifr_qlen;
	307	return 0;
	308
	309	case SIOCSIFNAME:
	310	ifr->ifr_newname[IFNAMSIZ-1] = '\0';
	311	return dev_change_name(dev, ifr->ifr_newname);
	312
	313	case SIOCSHWTSTAMP:
	314	err = net_hwtstamp_validate(ifr);
	315	if (err)
	316	return err;
	317	/* fall through */
	318
	319	/*
	320	* Unknown or private ioctl
	321	*/
	322	default:
	323	if ((cmd >= SIOCDEVPRIVATE &&
	324	cmd <= SIOCDEVPRIVATE + 15) \|\|
	325	cmd == SIOCBONDENSLAVE \|\|
	326	cmd == SIOCBONDRELEASE \|\|
	327	cmd == SIOCBONDSETHWADDR \|\|
	328	cmd == SIOCBONDSLAVEINFOQUERY \|\|
	329	cmd == SIOCBONDINFOQUERY \|\|
	330	cmd == SIOCBONDCHANGEACTIVE \|\|
	331	cmd == SIOCGMIIPHY \|\|
	332	cmd == SIOCGMIIREG \|\|
	333	cmd == SIOCSMIIREG \|\|
	334	cmd == SIOCBRADDIF \|\|
	335	cmd == SIOCBRDELIF \|\|
	336	cmd == SIOCSHWTSTAMP \|\|
fd468c74	337	cmd == SIOCGHWTSTAMP \|\|
96b45cbd CW	338	cmd == SIOCWANDEV) {
	339	err = -EOPNOTSUPP;
	340	if (ops->ndo_do_ioctl) {
	341	if (netif_device_present(dev))
	342	err = ops->ndo_do_ioctl(dev, ifr, cmd);
	343	else
	344	err = -ENODEV;
	345	}
	346	} else
	347	err = -EINVAL;
	348
	349	}
	350	return err;
	351	}
	352
	353	/**
	354	* dev_load - load a network module
	355	* @net: the applicable net namespace
	356	* @name: name of interface
	357	*
	358	* If a network interface is not present and the process has suitable
	359	* privileges this function loads the module. If module loading is not
	360	* available in this kernel then it becomes a nop.
	361	*/
	362
	363	void dev_load(struct net net, const char name)
	364	{
	365	struct net_device *dev;
	366	int no_module;
	367
	368	rcu_read_lock();
	369	dev = dev_get_by_name_rcu(net, name);
	370	rcu_read_unlock();
	371
	372	no_module = !dev;
	373	if (no_module && capable(CAP_NET_ADMIN))
	374	no_module = request_module("netdev-%s", name);
e020836d DB	375	if (no_module && capable(CAP_SYS_MODULE))
e020836d DB	376	request_module("%s", name);
96b45cbd CW	377	}
	378	EXPORT_SYMBOL(dev_load);
	379
	380	/*
	381	* This function handles all "interface"-type I/O control requests. The actual
	382	* 'doing' part of this is dev_ifsioc above.
	383	*/
	384
	385	/**
	386	* dev_ioctl - network device ioctl
	387	* @net: the applicable net namespace
	388	* @cmd: command to issue
	389	* @arg: pointer to a struct ifreq in user space
	390	*
	391	* Issue ioctl functions to devices. This is normally called by the
	392	* user space syscall interfaces but can sometimes be useful for
	393	* other purposes. The return value is the return from the syscall if
	394	* positive or a negative errno code on error.
	395	*/
	396
	397	int dev_ioctl(struct net net, unsigned int cmd, void __user arg)
	398	{
	399	struct ifreq ifr;
	400	int ret;
	401	char *colon;
	402
	403	/* One special case: SIOCGIFCONF takes ifconf argument
	404	and requires shared lock, because it sleeps writing
	405	to user space.
	406	*/
	407
	408	if (cmd == SIOCGIFCONF) {
	409	rtnl_lock();
	410	ret = dev_ifconf(net, (char __user *) arg);
	411	rtnl_unlock();
	412	return ret;
	413	}
	414	if (cmd == SIOCGIFNAME)
	415	return dev_ifname(net, (struct ifreq __user *)arg);
	416
68dd02d1 JB	417	/*
	418	* Take care of Wireless Extensions. Unfortunately struct iwreq
	419	* isn't a proper subset of struct ifreq (it's 8 byte shorter)
	420	* so we need to treat it specially, otherwise applications may
	421	* fault if the struct they're passing happens to land at the
	422	* end of a mapped page.
	423	*/
	424	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
	425	struct iwreq iwr;
	426
	427	if (copy_from_user(&iwr, arg, sizeof(iwr)))
	428	return -EFAULT;
	429
98de4e0e LA	430	iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
98de4e0e LA	431
68dd02d1 JB	432	return wext_handle_ioctl(net, &iwr, cmd, arg);
	433	}
	434
96b45cbd CW	435	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
	436	return -EFAULT;
	437
	438	ifr.ifr_name[IFNAMSIZ-1] = 0;
	439
	440	colon = strchr(ifr.ifr_name, ':');
	441	if (colon)
	442	*colon = 0;
	443
	444	/*
	445	* See which interface the caller is talking about.
	446	*/
	447
	448	switch (cmd) {
	449	/*
	450	* These ioctl calls:
	451	* - can be done by all.
	452	* - atomic and do not require locking.
	453	* - return a value
	454	*/
	455	case SIOCGIFFLAGS:
	456	case SIOCGIFMETRIC:
	457	case SIOCGIFMTU:
	458	case SIOCGIFHWADDR:
	459	case SIOCGIFSLAVE:
	460	case SIOCGIFMAP:
	461	case SIOCGIFINDEX:
	462	case SIOCGIFTXQLEN:
	463	dev_load(net, ifr.ifr_name);
	464	rcu_read_lock();
	465	ret = dev_ifsioc_locked(net, &ifr, cmd);
	466	rcu_read_unlock();
	467	if (!ret) {
	468	if (colon)
	469	*colon = ':';
	470	if (copy_to_user(arg, &ifr,
	471	sizeof(struct ifreq)))
	472	ret = -EFAULT;
	473	}
	474	return ret;
	475
	476	case SIOCETHTOOL:
	477	dev_load(net, ifr.ifr_name);
	478	rtnl_lock();
	479	ret = dev_ethtool(net, &ifr);
	480	rtnl_unlock();
	481	if (!ret) {
	482	if (colon)
	483	*colon = ':';
	484	if (copy_to_user(arg, &ifr,
	485	sizeof(struct ifreq)))
	486	ret = -EFAULT;
	487	}
	488	return ret;
	489
	490	/*
	491	* These ioctl calls:
	492	* - require superuser power.
	493	* - require strict serialization.
	494	* - return a value
	495	*/
	496	case SIOCGMIIPHY:
	497	case SIOCGMIIREG:
	498	case SIOCSIFNAME:
499	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
500	return -EPERM;
501	dev_load(net, ifr.ifr_name);
502	rtnl_lock();
503	ret = dev_ifsioc(net, &ifr, cmd);
504	rtnl_unlock();
505	if (!ret) {
506	if (colon)
507	*colon = ':';
508	if (copy_to_user(arg, &ifr,
509	sizeof(struct ifreq)))
510	ret = -EFAULT;
511	}
512	return ret;
513
514	/*
515	* These ioctl calls:
516	* - require superuser power.
517	* - require strict serialization.
518	* - do not return a value
519	*/
520	case SIOCSIFMAP:
521	case SIOCSIFTXQLEN:
522	if (!capable(CAP_NET_ADMIN))
523	return -EPERM;
524	/* fall through */
525	/*
526	* These ioctl calls:
527	* - require local superuser power.
528	* - require strict serialization.
529	* - do not return a value
530	*/
531	case SIOCSIFFLAGS:
532	case SIOCSIFMETRIC:
533	case SIOCSIFMTU:
534	case SIOCSIFHWADDR:
535	case SIOCSIFSLAVE:
536	case SIOCADDMULTI:
537	case SIOCDELMULTI:
538	case SIOCSIFHWBROADCAST:
539	case SIOCSMIIREG:
540	case SIOCBONDENSLAVE:
541	case SIOCBONDRELEASE:
542	case SIOCBONDSETHWADDR:
543	case SIOCBONDCHANGEACTIVE:
544	case SIOCBRADDIF:
545	case SIOCBRDELIF:
546	case SIOCSHWTSTAMP:
547	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
548	return -EPERM;
549	/* fall through */
550	case SIOCBONDSLAVEINFOQUERY:
551	case SIOCBONDINFOQUERY:
552	dev_load(net, ifr.ifr_name);
553	rtnl_lock();
554	ret = dev_ifsioc(net, &ifr, cmd);
555	rtnl_unlock();
556	return ret;
557
558	case SIOCGIFMEM:
559	/* Get the per device memory space. We can add this but
560	* currently do not support it */
561	case SIOCSIFMEM:
562	/* Set the per device memory buffer space.
563	* Not applicable in our case */
564	case SIOCSIFLINK:
565	return -ENOTTY;
566
567	/*
568	* Unknown or private ioctl.
569	*/
570	default:
571	if (cmd == SIOCWANDEV \|\|
fd468c74	572	cmd == SIOCGHWTSTAMP \|\|
96b45cbd CW	573	(cmd >= SIOCDEVPRIVATE &&
	574	cmd <= SIOCDEVPRIVATE + 15)) {
	575	dev_load(net, ifr.ifr_name);
	576	rtnl_lock();
	577	ret = dev_ifsioc(net, &ifr, cmd);
	578	rtnl_unlock();
	579	if (!ret && copy_to_user(arg, &ifr,
	580	sizeof(struct ifreq)))
	581	ret = -EFAULT;
	582	return ret;
	583	}
96b45cbd CW	584	return -ENOTTY;
	585	}
	586	}