net/core/dev_api.c

// SPDX-License-Identifier: GPL-2.0-or-later

#include <linux/netdevice.h>
#include <net/netdev_lock.h>

#include "dev.h"

/**
 * dev_change_name() - change name of a device
 * @dev: device
 * @newname: name (or format string) must be at least IFNAMSIZ
 *
 * Change name of a device, can pass format strings "eth%d".
 * for wildcarding.
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_change_name(struct net_device *dev, const char *newname)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_change_name(dev, newname);
	netdev_unlock_ops(dev);

	return ret;
}

/**
 * dev_set_alias() - change ifalias of a device
 * @dev: device
 * @alias: name up to IFALIASZ
 * @len: limit of bytes to copy from info
 *
 * Set ifalias for a device.
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_set_alias(dev, alias, len);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL(dev_set_alias);

/**
 * dev_change_flags() - change device settings
 * @dev: device
 * @flags: device state flags
 * @extack: netlink extended ack
 *
 * Change settings on device based state flags. The flags are
 * in the userspace exported format.
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_change_flags(struct net_device *dev, unsigned int flags,
		     struct netlink_ext_ack *extack)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_change_flags(dev, flags, extack);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL(dev_change_flags);

/**
 * dev_set_group() - change group this device belongs to
 * @dev: device
 * @new_group: group this device should belong to
 */
void dev_set_group(struct net_device *dev, int new_group)
{
	netdev_lock_ops(dev);
	netif_set_group(dev, new_group);
	netdev_unlock_ops(dev);
}

int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa,
			     struct netlink_ext_ack *extack)
{
	int ret;

	down_write(&dev_addr_sem);
	netdev_lock_ops(dev);
	ret = netif_set_mac_address(dev, sa, extack);
	netdev_unlock_ops(dev);
	up_write(&dev_addr_sem);

	return ret;
}
EXPORT_SYMBOL(dev_set_mac_address_user);

/**
 * dev_change_net_namespace() - move device to different nethost namespace
 * @dev: device
 * @net: network namespace
 * @pat: If not NULL name pattern to try if the current device name
 *       is already taken in the destination network namespace.
 *
 * This function shuts down a device interface and moves it
 * to a new network namespace. On success 0 is returned, on
 * a failure a netagive errno code is returned.
 *
 * Callers must hold the rtnl semaphore.
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_change_net_namespace(struct net_device *dev, struct net *net,
			     const char *pat)
{
	return __dev_change_net_namespace(dev, net, pat, 0, NULL);
}
EXPORT_SYMBOL_GPL(dev_change_net_namespace);

/**
 * dev_change_carrier() - change device carrier
 * @dev: device
 * @new_carrier: new value
 *
 * Change device carrier
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_change_carrier(struct net_device *dev, bool new_carrier)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_change_carrier(dev, new_carrier);
	netdev_unlock_ops(dev);

	return ret;
}

/**
 * dev_change_tx_queue_len() - change TX queue length of a netdevice
 * @dev: device
 * @new_len: new tx queue length
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_change_tx_queue_len(dev, new_len);
	netdev_unlock_ops(dev);

	return ret;
}

/**
 * dev_change_proto_down() - set carrier according to proto_down
 * @dev: device
 * @proto_down: new value
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_change_proto_down(struct net_device *dev, bool proto_down)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_change_proto_down(dev, proto_down);
	netdev_unlock_ops(dev);

	return ret;
}

/**
 * dev_open() - prepare an interface for use
 * @dev: device to open
 * @extack: netlink extended ack
 *
 * Takes a device from down to up state. The device's private open
 * function is invoked and then the multicast lists are loaded. Finally
 * the device is moved into the up state and a %NETDEV_UP message is
 * sent to the netdev notifier chain.
 *
 * Calling this function on an active interface is a nop. On a failure
 * a negative errno code is returned.
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_open(dev, extack);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL(dev_open);

/**
 * dev_close() - shutdown an interface
 * @dev: device to shutdown
 *
 * This function moves an active device into down state. A
 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
 * chain.
 */
void dev_close(struct net_device *dev)
{
	netdev_lock_ops(dev);
	netif_close(dev);
	netdev_unlock_ops(dev);
}
EXPORT_SYMBOL(dev_close);

int dev_eth_ioctl(struct net_device *dev,
		  struct ifreq *ifr, unsigned int cmd)
{
	const struct net_device_ops *ops = dev->netdev_ops;
	int ret = -ENODEV;

	if (!ops->ndo_eth_ioctl)
		return -EOPNOTSUPP;

	netdev_lock_ops(dev);
	if (netif_device_present(dev))
		ret = ops->ndo_eth_ioctl(dev, ifr, cmd);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL(dev_eth_ioctl);

int dev_set_mtu(struct net_device *dev, int new_mtu)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_set_mtu(dev, new_mtu);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL(dev_set_mtu);

/**
 * dev_disable_lro() - disable Large Receive Offload on a device
 * @dev: device
 *
 * Disable Large Receive Offload (LRO) on a net device.  Must be
 * called under RTNL.  This is needed if received packets may be
 * forwarded to another interface.
 */
void dev_disable_lro(struct net_device *dev)
{
	netdev_lock_ops(dev);
	netif_disable_lro(dev);
	netdev_unlock_ops(dev);
}
EXPORT_SYMBOL(dev_disable_lro);

/**
 * dev_set_promiscuity() - update promiscuity count on a device
 * @dev: device
 * @inc: modifier
 *
 * Add or remove promiscuity from a device. While the count in the device
 * remains above zero the interface remains promiscuous. Once it hits zero
 * the device reverts back to normal filtering operation. A negative inc
 * value is used to drop promiscuity on the device.
 * Return 0 if successful or a negative errno code on error.
 */
int dev_set_promiscuity(struct net_device *dev, int inc)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_set_promiscuity(dev, inc);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL(dev_set_promiscuity);

/**
 * dev_set_allmulti() - update allmulti count on a device
 * @dev: device
 * @inc: modifier
 *
 * Add or remove reception of all multicast frames to a device. While the
 * count in the device remains above zero the interface remains listening
 * to all interfaces. Once it hits zero the device reverts back to normal
 * filtering operation. A negative @inc value is used to drop the counter
 * when releasing a resource needing all multicasts.
 *
 * Return: 0 on success, -errno on failure.
 */

int dev_set_allmulti(struct net_device *dev, int inc)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_set_allmulti(dev, inc, true);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL(dev_set_allmulti);

/**
 * dev_set_mac_address() - change Media Access Control Address
 * @dev: device
 * @sa: new address
 * @extack: netlink extended ack
 *
 * Change the hardware (MAC) address of the device
 *
 * Return: 0 on success, -errno on failure.
 */
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
			struct netlink_ext_ack *extack)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_set_mac_address(dev, sa, extack);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL(dev_set_mac_address);

int dev_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf)
{
	int ret;

	netdev_lock_ops(dev);
	ret = netif_xdp_propagate(dev, bpf);
	netdev_unlock_ops(dev);

	return ret;
}
EXPORT_SYMBOL_GPL(dev_xdp_propagate);

/**
 * netdev_state_change() - device changes state
 * @dev: device to cause notification
 *
 * Called to indicate a device has changed state. This function calls
 * the notifier chains for netdev_chain and sends a NEWLINK message
 * to the routing socket.
 */
void netdev_state_change(struct net_device *dev)
{
	netdev_lock_ops(dev);
	netif_state_change(dev);
	netdev_unlock_ops(dev);
}
EXPORT_SYMBOL(netdev_state_change);