linux/net/core/dev_ioctl.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kmod.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/net_tstamp.h>
#include <linux/phylib_stubs.h>
#include <linux/wireless.h>
#include <linux/if_bridge.h>
#include <net/dsa_stubs.h>
#include <net/wext.h>

#include "dev.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 *ifr)
{ … }

/*
 *	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'.
 */
int dev_ifconf(struct net *net, struct ifconf __user *uifc)
{ … }

static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
{ … }

static int dev_setifmap(struct net_device *dev, struct ifreq *ifr)
{ … }

/*
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
 */
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
{ … }

static int net_hwtstamp_validate(const struct kernel_hwtstamp_config *cfg)
{ … }

static int dev_eth_ioctl(struct net_device *dev,
			 struct ifreq *ifr, unsigned int cmd)
{ … }

/**
 * dev_get_hwtstamp_phylib() - Get hardware timestamping settings of NIC
 *	or of attached phylib PHY
 * @dev: Network device
 * @cfg: Timestamping configuration structure
 *
 * Helper for calling the default hardware provider timestamping.
 *
 * Note: phy_mii_ioctl() only handles SIOCSHWTSTAMP (not SIOCGHWTSTAMP), and
 * there only exists a phydev->mii_ts->hwtstamp() method. So this will return
 * -EOPNOTSUPP for phylib for now, which is still more accurate than letting
 * the netdev handle the GET request.
 */
static int dev_get_hwtstamp_phylib(struct net_device *dev,
				   struct kernel_hwtstamp_config *cfg)
{ … }

static int dev_get_hwtstamp(struct net_device *dev, struct ifreq *ifr)
{ … }

/**
 * dev_set_hwtstamp_phylib() - Change hardware timestamping of NIC
 *	or of attached phylib PHY
 * @dev: Network device
 * @cfg: Timestamping configuration structure
 * @extack: Netlink extended ack message structure, for error reporting
 *
 * Helper for enforcing a common policy that phylib timestamping, if available,
 * should take precedence in front of hardware timestamping provided by the
 * netdev. If the netdev driver needs to perform specific actions even for PHY
 * timestamping to work properly (a switch port must trap the timestamped
 * frames and not forward them), it must set dev->see_all_hwtstamp_requests.
 */
int dev_set_hwtstamp_phylib(struct net_device *dev,
			    struct kernel_hwtstamp_config *cfg,
			    struct netlink_ext_ack *extack)
{ … }

static int dev_set_hwtstamp(struct net_device *dev, struct ifreq *ifr)
{ … }

static int generic_hwtstamp_ioctl_lower(struct net_device *dev, int cmd,
					struct kernel_hwtstamp_config *kernel_cfg)
{ … }

int generic_hwtstamp_get_lower(struct net_device *dev,
			       struct kernel_hwtstamp_config *kernel_cfg)
{ … }
EXPORT_SYMBOL(…);

int generic_hwtstamp_set_lower(struct net_device *dev,
			       struct kernel_hwtstamp_config *kernel_cfg,
			       struct netlink_ext_ack *extack)
{ … }
EXPORT_SYMBOL(…);

static int dev_siocbond(struct net_device *dev,
			struct ifreq *ifr, unsigned int cmd)
{ … }

static int dev_siocdevprivate(struct net_device *dev, struct ifreq *ifr,
			      void __user *data, unsigned int cmd)
{ … }

static int dev_siocwandev(struct net_device *dev, struct if_settings *ifs)
{ … }

/*
 *	Perform the SIOCxIFxxx calls, inside rtnl_lock()
 */
static int dev_ifsioc(struct net *net, struct ifreq *ifr, void __user *data,
		      unsigned int cmd)
{ … }

/**
 *	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)
{ … }
EXPORT_SYMBOL(…);

/*
 *	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
 *	@ifr: pointer to a struct ifreq in user space
 *	@data: data exchanged with userspace
 *	@need_copyout: whether or not copy_to_user() should be called
 *
 *	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, struct ifreq *ifr,
	      void __user *data, bool *need_copyout)
{ … }