[GitHub/mt8127/android_kernel_alcatel_ttab.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 net_device *dev;
	struct ifreq ifr;
	unsigned seq;

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

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

retry:
	seq = read_seqcount_begin(&devnet_rename_seq);
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
	if (!dev) {
		rcu_read_unlock();
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
	rcu_read_unlock();
	if (read_seqcount_retry(&devnet_rename_seq, seq))
		goto retry;

	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 == 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)) {
		if (!request_module("%s", name))
			pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated).  Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
				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 >= 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	{
	22	struct net_device *dev;
	23	struct ifreq ifr;
	24	unsigned seq;
	25
	26	/*
	27	* Fetch the caller's info block.
	28	*/
	29
	30	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
	31	return -EFAULT;
	32
	33	retry:
	34	seq = read_seqcount_begin(&devnet_rename_seq);
	35	rcu_read_lock();
	36	dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
	37	if (!dev) {
	38	rcu_read_unlock();
	39	return -ENODEV;
	40	}
	41
	42	strcpy(ifr.ifr_name, dev->name);
	43	rcu_read_unlock();
	44	if (read_seqcount_retry(&devnet_rename_seq, seq))
	45	goto retry;
	46
	47	if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
	48	return -EFAULT;
	49	return 0;
	50	}
	51
	52	static gifconf_func_t *gifconf_list[NPROTO];
	53
	54	/**
	55	* register_gifconf - register a SIOCGIF handler
	56	* @family: Address family
	57	* @gifconf: Function handler
	58	*
	59	* Register protocol dependent address dumping routines. The handler
	60	* that is passed must not be freed or reused until it has been replaced
	61	* by another handler.
	62	*/
	63	int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
	64	{
65	if (family >= NPROTO)
66	return -EINVAL;
67	gifconf_list[family] = gifconf;
68	return 0;
69	}
70	EXPORT_SYMBOL(register_gifconf);
71
72	/*
73	* Perform a SIOCGIFCONF call. This structure will change
74	* size eventually, and there is nothing I can do about it.
75	* Thus we will need a 'compatibility mode'.
76	*/
77
78	static int dev_ifconf(struct net net, char __user arg)
79	{
80	struct ifconf ifc;
81	struct net_device *dev;
82	char __user *pos;
83	int len;
84	int total;
85	int i;
86
87	/*
88	* Fetch the caller's info block.
89	*/
90
91	if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
92	return -EFAULT;
93
94	pos = ifc.ifc_buf;
95	len = ifc.ifc_len;
96
97	/*
98	* Loop over the interfaces, and write an info block for each.
99	*/
100
101	total = 0;
102	for_each_netdev(net, dev) {
103	for (i = 0; i < NPROTO; i++) {
104	if (gifconf_list[i]) {
105	int done;
106	if (!pos)
107	done = gifconf_list[i](dev, NULL, 0);
108	else
109	done = gifconf_list[i](dev, pos + total,
110	len - total);
111	if (done < 0)
112	return -EFAULT;
113	total += done;
114	}
115	}
116	}
117
118	/*
119	* All done. Write the updated control block back to the caller.
120	*/
121	ifc.ifc_len = total;
122
123	/*
124	* Both BSD and Solaris return 0 here, so we do too.
125	*/
126	return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
127	}
128
129	/*
130	* Perform the SIOCxIFxxx calls, inside rcu_read_lock()
131	*/
132	static int dev_ifsioc_locked(struct net net, struct ifreq ifr, unsigned int cmd)
133	{
134	int err;
135	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
136
137	if (!dev)
138	return -ENODEV;
139
140	switch (cmd) {
141	case SIOCGIFFLAGS: /* Get interface flags */
142	ifr->ifr_flags = (short) dev_get_flags(dev);
143	return 0;
144
145	case SIOCGIFMETRIC: /* Get the metric on the interface
146	(currently unused) */
147	ifr->ifr_metric = 0;
148	return 0;
149
150	case SIOCGIFMTU: /* Get the MTU of a device */
151	ifr->ifr_mtu = dev->mtu;
152	return 0;
153
154	case SIOCGIFHWADDR:
155	if (!dev->addr_len)
156	memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
157	else
158	memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
159	min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
160	ifr->ifr_hwaddr.sa_family = dev->type;
161	return 0;
162
163	case SIOCGIFSLAVE:
164	err = -EINVAL;
165	break;
166
167	case SIOCGIFMAP:
168	ifr->ifr_map.mem_start = dev->mem_start;
169	ifr->ifr_map.mem_end = dev->mem_end;
170	ifr->ifr_map.base_addr = dev->base_addr;
171	ifr->ifr_map.irq = dev->irq;
172	ifr->ifr_map.dma = dev->dma;
173	ifr->ifr_map.port = dev->if_port;
174	return 0;
175
176	case SIOCGIFINDEX:
177	ifr->ifr_ifindex = dev->ifindex;
178	return 0;
179
180	case SIOCGIFTXQLEN:
181	ifr->ifr_qlen = dev->tx_queue_len;
182	return 0;
183
184	default:
185	/* dev_ioctl() should ensure this case
186	* is never reached
187	*/
188	WARN_ON(1);
189	err = -ENOTTY;
190	break;
191
192	}
193	return err;
194	}
195
196	static int net_hwtstamp_validate(struct ifreq *ifr)
197	{
198	struct hwtstamp_config cfg;
199	enum hwtstamp_tx_types tx_type;
200	enum hwtstamp_rx_filters rx_filter;
201	int tx_type_valid = 0;
202	int rx_filter_valid = 0;
203
204	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
205	return -EFAULT;
206
207	if (cfg.flags) /* reserved for future extensions */
208	return -EINVAL;
209
210	tx_type = cfg.tx_type;
211	rx_filter = cfg.rx_filter;
212
213	switch (tx_type) {
214	case HWTSTAMP_TX_OFF:
215	case HWTSTAMP_TX_ON:
216	case HWTSTAMP_TX_ONESTEP_SYNC:
217	tx_type_valid = 1;
218	break;
219	}
220
221	switch (rx_filter) {
222	case HWTSTAMP_FILTER_NONE:
223	case HWTSTAMP_FILTER_ALL:
224	case HWTSTAMP_FILTER_SOME:
225	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
226	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
227	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
228	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
229	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
230	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
231	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
232	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
233	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
234	case HWTSTAMP_FILTER_PTP_V2_EVENT:
235	case HWTSTAMP_FILTER_PTP_V2_SYNC:
236	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
237	rx_filter_valid = 1;
238	break;
239	}
240
241	if (!tx_type_valid \|\| !rx_filter_valid)
242	return -ERANGE;
243
244	return 0;
245	}
246
247	/*
248	* Perform the SIOCxIFxxx calls, inside rtnl_lock()
249	*/
250	static int dev_ifsioc(struct net net, struct ifreq ifr, unsigned int cmd)
251	{
252	int err;
253	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
254	const struct net_device_ops *ops;
255
256	if (!dev)
257	return -ENODEV;
258
259	ops = dev->netdev_ops;
260
261	switch (cmd) {
262	case SIOCSIFFLAGS: /* Set interface flags */
263	return dev_change_flags(dev, ifr->ifr_flags);
264
265	case SIOCSIFMETRIC: /* Set the metric on the interface
266	(currently unused) */
267	return -EOPNOTSUPP;
268
269	case SIOCSIFMTU: /* Set the MTU of a device */
270	return dev_set_mtu(dev, ifr->ifr_mtu);
271
272	case SIOCSIFHWADDR:
273	return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
274
275	case SIOCSIFHWBROADCAST:
276	if (ifr->ifr_hwaddr.sa_family != dev->type)
277	return -EINVAL;
278	memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
279	min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
280	call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
281	return 0;
282
283	case SIOCSIFMAP:
284	if (ops->ndo_set_config) {
285	if (!netif_device_present(dev))
286	return -ENODEV;
287	return ops->ndo_set_config(dev, &ifr->ifr_map);
288	}
289	return -EOPNOTSUPP;
290
291	case SIOCADDMULTI:
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_add_global(dev, ifr->ifr_hwaddr.sa_data);
298
299	case SIOCDELMULTI:
300	if (!ops->ndo_set_rx_mode \|\|
301	ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
302	return -EINVAL;
303	if (!netif_device_present(dev))
304	return -ENODEV;
305	return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
306
307	case SIOCSIFTXQLEN:
308	if (ifr->ifr_qlen < 0)
309	return -EINVAL;
310	dev->tx_queue_len = ifr->ifr_qlen;
311	return 0;
312
313	case SIOCSIFNAME:
314	ifr->ifr_newname[IFNAMSIZ-1] = '\0';
315	return dev_change_name(dev, ifr->ifr_newname);
316
317	case SIOCSHWTSTAMP:
318	err = net_hwtstamp_validate(ifr);
319	if (err)
320	return err;
321	/* fall through */
322
323	/*
324	* Unknown or private ioctl
325	*/
326	default:
327	if ((cmd >= SIOCDEVPRIVATE &&
328	cmd <= SIOCDEVPRIVATE + 15) \|\|
329	cmd == SIOCBONDENSLAVE \|\|
330	cmd == SIOCBONDRELEASE \|\|
331	cmd == SIOCBONDSETHWADDR \|\|
332	cmd == SIOCBONDSLAVEINFOQUERY \|\|
333	cmd == SIOCBONDINFOQUERY \|\|
334	cmd == SIOCBONDCHANGEACTIVE \|\|
335	cmd == SIOCGMIIPHY \|\|
336	cmd == SIOCGMIIREG \|\|
337	cmd == SIOCSMIIREG \|\|
338	cmd == SIOCBRADDIF \|\|
339	cmd == SIOCBRDELIF \|\|
340	cmd == SIOCSHWTSTAMP \|\|
341	cmd == SIOCWANDEV) {
342	err = -EOPNOTSUPP;
343	if (ops->ndo_do_ioctl) {
344	if (netif_device_present(dev))
345	err = ops->ndo_do_ioctl(dev, ifr, cmd);
346	else
347	err = -ENODEV;
348	}
349	} else
350	err = -EINVAL;
351
352	}
353	return err;
354	}
355
356	/**
357	* dev_load - load a network module
358	* @net: the applicable net namespace
359	* @name: name of interface
360	*
361	* If a network interface is not present and the process has suitable
362	* privileges this function loads the module. If module loading is not
363	* available in this kernel then it becomes a nop.
364	*/
365
366	void dev_load(struct net net, const char name)
367	{
368	struct net_device *dev;
369	int no_module;
370
371	rcu_read_lock();
372	dev = dev_get_by_name_rcu(net, name);
373	rcu_read_unlock();
374
375	no_module = !dev;
376	if (no_module && capable(CAP_NET_ADMIN))
377	no_module = request_module("netdev-%s", name);
378	if (no_module && capable(CAP_SYS_MODULE)) {
379	if (!request_module("%s", name))
380	pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated). Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
381	name);
382	}
383	}
384	EXPORT_SYMBOL(dev_load);
385
386	/*
387	* This function handles all "interface"-type I/O control requests. The actual
388	* 'doing' part of this is dev_ifsioc above.
389	*/
390
391	/**
392	* dev_ioctl - network device ioctl
393	* @net: the applicable net namespace
394	* @cmd: command to issue
395	* @arg: pointer to a struct ifreq in user space
396	*
397	* Issue ioctl functions to devices. This is normally called by the
398	* user space syscall interfaces but can sometimes be useful for
399	* other purposes. The return value is the return from the syscall if
400	* positive or a negative errno code on error.
401	*/
402
403	int dev_ioctl(struct net net, unsigned int cmd, void __user arg)
404	{
405	struct ifreq ifr;
406	int ret;
407	char *colon;
408
409	/* One special case: SIOCGIFCONF takes ifconf argument
410	and requires shared lock, because it sleeps writing
411	to user space.
412	*/
413
414	if (cmd == SIOCGIFCONF) {
415	rtnl_lock();
416	ret = dev_ifconf(net, (char __user *) arg);
417	rtnl_unlock();
418	return ret;
419	}
420	if (cmd == SIOCGIFNAME)
421	return dev_ifname(net, (struct ifreq __user *)arg);
422
423	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
424	return -EFAULT;
425
426	ifr.ifr_name[IFNAMSIZ-1] = 0;
427
428	colon = strchr(ifr.ifr_name, ':');
429	if (colon)
430	*colon = 0;
431
432	/*
433	* See which interface the caller is talking about.
434	*/
435
436	switch (cmd) {
437	/*
438	* These ioctl calls:
439	* - can be done by all.
440	* - atomic and do not require locking.
441	* - return a value
442	*/
443	case SIOCGIFFLAGS:
444	case SIOCGIFMETRIC:
445	case SIOCGIFMTU:
446	case SIOCGIFHWADDR:
447	case SIOCGIFSLAVE:
448	case SIOCGIFMAP:
449	case SIOCGIFINDEX:
450	case SIOCGIFTXQLEN:
451	dev_load(net, ifr.ifr_name);
452	rcu_read_lock();
453	ret = dev_ifsioc_locked(net, &ifr, cmd);
454	rcu_read_unlock();
455	if (!ret) {
456	if (colon)
457	*colon = ':';
458	if (copy_to_user(arg, &ifr,
459	sizeof(struct ifreq)))
460	ret = -EFAULT;
461	}
462	return ret;
463
464	case SIOCETHTOOL:
465	dev_load(net, ifr.ifr_name);
466	rtnl_lock();
467	ret = dev_ethtool(net, &ifr);
468	rtnl_unlock();
469	if (!ret) {
470	if (colon)
471	*colon = ':';
472	if (copy_to_user(arg, &ifr,
473	sizeof(struct ifreq)))
474	ret = -EFAULT;
475	}
476	return ret;
477
478	/*
479	* These ioctl calls:
480	* - require superuser power.
481	* - require strict serialization.
482	* - return a value
483	*/
484	case SIOCGMIIPHY:
485	case SIOCGMIIREG:
486	case SIOCSIFNAME:
487	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
488	return -EPERM;
489	dev_load(net, ifr.ifr_name);
490	rtnl_lock();
491	ret = dev_ifsioc(net, &ifr, cmd);
492	rtnl_unlock();
493	if (!ret) {
494	if (colon)
495	*colon = ':';
496	if (copy_to_user(arg, &ifr,
497	sizeof(struct ifreq)))
498	ret = -EFAULT;
499	}
500	return ret;
501
502	/*
503	* These ioctl calls:
504	* - require superuser power.
505	* - require strict serialization.
506	* - do not return a value
507	*/
508	case SIOCSIFMAP:
509	case SIOCSIFTXQLEN:
510	if (!capable(CAP_NET_ADMIN))
511	return -EPERM;
512	/* fall through */
513	/*
514	* These ioctl calls:
515	* - require local superuser power.
516	* - require strict serialization.
517	* - do not return a value
518	*/
519	case SIOCSIFFLAGS:
520	case SIOCSIFMETRIC:
521	case SIOCSIFMTU:
522	case SIOCSIFHWADDR:
523	case SIOCSIFSLAVE:
524	case SIOCADDMULTI:
525	case SIOCDELMULTI:
526	case SIOCSIFHWBROADCAST:
527	case SIOCSMIIREG:
528	case SIOCBONDENSLAVE:
529	case SIOCBONDRELEASE:
530	case SIOCBONDSETHWADDR:
531	case SIOCBONDCHANGEACTIVE:
532	case SIOCBRADDIF:
533	case SIOCBRDELIF:
534	case SIOCSHWTSTAMP:
535	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
536	return -EPERM;
537	/* fall through */
538	case SIOCBONDSLAVEINFOQUERY:
539	case SIOCBONDINFOQUERY:
540	dev_load(net, ifr.ifr_name);
541	rtnl_lock();
542	ret = dev_ifsioc(net, &ifr, cmd);
543	rtnl_unlock();
544	return ret;
545
546	case SIOCGIFMEM:
547	/* Get the per device memory space. We can add this but
548	* currently do not support it */
549	case SIOCSIFMEM:
550	/* Set the per device memory buffer space.
551	* Not applicable in our case */
552	case SIOCSIFLINK:
553	return -ENOTTY;
554
555	/*
556	* Unknown or private ioctl.
557	*/
558	default:
559	if (cmd == SIOCWANDEV \|\|
560	(cmd >= SIOCDEVPRIVATE &&
561	cmd <= SIOCDEVPRIVATE + 15)) {
562	dev_load(net, ifr.ifr_name);
563	rtnl_lock();
564	ret = dev_ifsioc(net, &ifr, cmd);
565	rtnl_unlock();
566	if (!ret && copy_to_user(arg, &ifr,
567	sizeof(struct ifreq)))
568	ret = -EFAULT;
569	return ret;
570	}
571	/* Take care of Wireless Extensions */
572	if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
573	return wext_handle_ioctl(net, &ifr, cmd, arg);
574	return -ENOTTY;
575	}
576	}