net/core/dev_ioctl.c - linux-imx - Git at Google

 // 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 __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;
 		if (dev->tx_queue_len ^ ifr->ifr_qlen) {
 			unsigned int orig_len = dev->tx_queue_len;

 			dev->tx_queue_len = ifr->ifr_qlen;
 			err = call_netdevice_notifiers(
 					NETDEV_CHANGE_TX_QUEUE_LEN, dev);
 			err = notifier_to_errno(err);
 			if (err) {
 				dev->tx_queue_len = orig_len;
 				return err;
 			}
 		}
 		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;
 	}
 }
	// 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 __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;
	if (dev->tx_queue_len ^ ifr->ifr_qlen) {
	unsigned int orig_len = dev->tx_queue_len;

	dev->tx_queue_len = ifr->ifr_qlen;
	err = call_netdevice_notifiers(
	NETDEV_CHANGE_TX_QUEUE_LEN, dev);
	err = notifier_to_errno(err);
	if (err) {
	dev->tx_queue_len = orig_len;
	return err;
	}
	}
	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;
	}
	}