Commit 96b45cbd authored by Cong Wang's avatar Cong Wang Committed by David S. Miller
Browse files

net: move ioctl functions into a separated file 



They well deserve a separated unit.

Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 31d17536

net/core/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ obj-$(CONFIG_SYSCTL) += sysctl_net_core.o 


obj-y		     += dev.o ethtool.o dev_addr_lists.o dst.o netevent.o \

			neighbour.o rtnetlink.o utils.o link_watch.o filter.o \

			sock_diag.o

			sock_diag.o dev_ioctl.o



obj-$(CONFIG_XFRM) += flow.o

obj-y += net-sysfs.o

net/core/dev.c

+0 −573
Original line number Diff line number Diff line
@@ -106,7 +106,6 @@ 
#include <net/xfrm.h>

#include <linux/highmem.h>

#include <linux/init.h>

#include <linux/kmod.h>

#include <linux/module.h>

#include <linux/netpoll.h>

#include <linux/rcupdate.h>
@@ -132,7 +131,6 @@ 
#include <linux/pci.h>

#include <linux/inetdevice.h>

#include <linux/cpu_rmap.h>

#include <linux/net_tstamp.h>

#include <linux/static_key.h>



#include "net-sysfs.h"
@@ -1226,36 +1224,6 @@ void netdev_notify_peers(struct net_device *dev) 
}

EXPORT_SYMBOL(netdev_notify_peers);



/**

 *	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);



static int __dev_open(struct net_device *dev)

{

	const struct net_device_ops *ops = dev->netdev_ops;
@@ -1645,57 +1613,6 @@ static inline void net_timestamp_set(struct sk_buff *skb) 
			__net_timestamp(SKB);		\

	}						\



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;

}



static inline bool is_skb_forwardable(struct net_device *dev,

				      struct sk_buff *skb)

{
@@ -4300,127 +4217,6 @@ softnet_break: 
	goto out;

}



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);





/*

 *	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;

}



/*

 *	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;

}



#ifdef CONFIG_PROC_FS



#define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
@@ -5381,375 +5177,6 @@ int dev_change_carrier(struct net_device *dev, bool new_carrier) 
}

EXPORT_SYMBOL(dev_change_carrier);



/*

 *	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;

}



/*

 *	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;

}



/*

 *	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;

	}

}





/**

 *	dev_new_index	-	allocate an ifindex

 *	@net: the applicable net namespace

net/core/dev_ioctl.c

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