path: root/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/ptp_clock_kernel.h>
#include <linux/wireless.h>
#include <linux/if_bridge.h>
#include <net/dsa_stubs.h>
#include <net/netdev_lock.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)
{
	ifr->ifr_name[IFNAMSIZ-1] = 0;
	return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
}

/*
 *	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)
{
	struct net_device *dev;
	void __user *pos;
	size_t size;
	int len, total = 0, done;

	/* both the ifconf and the ifreq structures are slightly different */
	if (in_compat_syscall()) {
		struct compat_ifconf ifc32;

		if (copy_from_user(&ifc32, uifc, sizeof(struct compat_ifconf)))
			return -EFAULT;

		pos = compat_ptr(ifc32.ifcbuf);
		len = ifc32.ifc_len;
		size = sizeof(struct compat_ifreq);
	} else {
		struct ifconf ifc;

		if (copy_from_user(&ifc, uifc, sizeof(struct ifconf)))
			return -EFAULT;

		pos = ifc.ifc_buf;
		len = ifc.ifc_len;
		size = sizeof(struct ifreq);
	}

	/* Loop over the interfaces, and write an info block for each. */
	rtnl_net_lock(net);
	for_each_netdev(net, dev) {
		if (!pos)
			done = inet_gifconf(dev, NULL, 0, size);
		else
			done = inet_gifconf(dev, pos + total,
					    len - total, size);
		if (done < 0) {
			rtnl_net_unlock(net);
			return -EFAULT;
		}
		total += done;
	}
	rtnl_net_unlock(net);

	return put_user(total, &uifc->ifc_len);
}

static int dev_getifmap(struct net_device *dev, struct ifreq *ifr)
{
	struct ifmap *ifmap = &ifr->ifr_map;

	if (in_compat_syscall()) {
		struct compat_ifmap *cifmap = (struct compat_ifmap *)ifmap;

		cifmap->mem_start = dev->mem_start;
		cifmap->mem_end   = dev->mem_end;
		cifmap->base_addr = dev->base_addr;
		cifmap->irq       = dev->irq;
		cifmap->dma       = dev->dma;
		cifmap->port      = dev->if_port;

		return 0;
	}

	ifmap->mem_start  = dev->mem_start;
	ifmap->mem_end    = dev->mem_end;
	ifmap->base_addr  = dev->base_addr;
	ifmap->irq        = dev->irq;
	ifmap->dma        = dev->dma;
	ifmap->port       = dev->if_port;

	return 0;
}

static int netif_setifmap(struct net_device *dev, struct ifreq *ifr)
{
	struct compat_ifmap *cifmap = (struct compat_ifmap *)&ifr->ifr_map;

	if (!dev->netdev_ops->ndo_set_config)
		return -EOPNOTSUPP;

	if (in_compat_syscall()) {
		struct ifmap ifmap = {
			.mem_start  = cifmap->mem_start,
			.mem_end    = cifmap->mem_end,
			.base_addr  = cifmap->base_addr,
			.irq        = cifmap->irq,
			.dma        = cifmap->dma,
			.port       = cifmap->port,
		};

		return dev->netdev_ops->ndo_set_config(dev, &ifmap);
	}

	return dev->netdev_ops->ndo_set_config(dev, &ifr->ifr_map);
}

/*
 *	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)netif_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 SIOCGIFSLAVE:
		err = -EINVAL;
		break;

	case SIOCGIFMAP:
		return dev_getifmap