path: root/net/core/ethtool.c

/*
 * net/core/ethtool.c - Ethtool ioctl handler
 * Copyright (c) 2003 Matthew Wilcox <matthew@wil.cx>
 *
 * This file is where we call all the ethtool_ops commands to get
 * the information ethtool needs.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/ethtool.h>
#include <linux/netdevice.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <linux/slab.h>

/*
 * Some useful ethtool_ops methods that're device independent.
 * If we find that all drivers want to do the same thing here,
 * we can turn these into dev_() function calls.
 */

u32 ethtool_op_get_link(struct net_device *dev)
{
	return netif_carrier_ok(dev) ? 1 : 0;
}
EXPORT_SYMBOL(ethtool_op_get_link);

u32 ethtool_op_get_rx_csum(struct net_device *dev)
{
	return (dev->features & NETIF_F_ALL_CSUM) != 0;
}
EXPORT_SYMBOL(ethtool_op_get_rx_csum);

u32 ethtool_op_get_tx_csum(struct net_device *dev)
{
	return (dev->features & NETIF_F_ALL_CSUM) != 0;
}
EXPORT_SYMBOL(ethtool_op_get_tx_csum);

int ethtool_op_set_tx_csum(struct net_device *dev, u32 data)
{
	if (data)
		dev->features |= NETIF_F_IP_CSUM;
	else
		dev->features &= ~NETIF_F_IP_CSUM;

	return 0;
}

int ethtool_op_set_tx_hw_csum(struct net_device *dev, u32 data)
{
	if (data)
		dev->features |= NETIF_F_HW_CSUM;
	else
		dev->features &= ~NETIF_F_HW_CSUM;

	return 0;
}
EXPORT_SYMBOL(ethtool_op_set_tx_hw_csum);

int ethtool_op_set_tx_ipv6_csum(struct net_device *dev, u32 data)
{
	if (data)
		dev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
	else
		dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);

	return 0;
}
EXPORT_SYMBOL(ethtool_op_set_tx_ipv6_csum);

u32 ethtool_op_get_sg(struct net_device *dev)
{
	return (dev->features & NETIF_F_SG) != 0;
}
EXPORT_SYMBOL(ethtool_op_get_sg);

int ethtool_op_set_sg(struct net_device *dev, u32 data)
{
	if (data)
		dev->features |= NETIF_F_SG;
	else
		dev->features &= ~NETIF_F_SG;

	return 0;
}
EXPORT_SYMBOL(ethtool_op_set_sg);

u32 ethtool_op_get_tso(struct net_device *dev)
{
	return (dev->features & NETIF_F_TSO) != 0;
}
EXPORT_SYMBOL(ethtool_op_get_tso);

int ethtool_op_set_tso(struct net_device *dev, u32 data)
{
	if (data)
		dev->features |= NETIF_F_TSO;
	else
		dev->features &= ~NETIF_F_TSO;

	return 0;
}
EXPORT_SYMBOL(ethtool_op_set_tso);

u32 ethtool_op_get_ufo(struct net_device *dev)
{
	return (dev->features & NETIF_F_UFO) != 0;
}
EXPORT_SYMBOL(ethtool_op_get_ufo);

int ethtool_op_set_ufo(struct net_device *dev, u32 data)
{
	if (data)
		dev->features |= NETIF_F_UFO;
	else
		dev->features &= ~NETIF_F_UFO;
	return 0;
}
EXPORT_SYMBOL(ethtool_op_set_ufo);

/* the following list of flags are the same as their associated
 * NETIF_F_xxx values in include/linux/netdevice.h
 */
static const u32 flags_dup_features =
	(ETH_FLAG_LRO | ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH);

u32 ethtool_op_get_flags(struct net_device *dev)
{
	/* in the future, this function will probably contain additional
	 * handling for flags which are not so easily handled
	 * by a simple masking operation
	 */

	return dev->features & flags_dup_features;
}
EXPORT_SYMBOL(ethtool_op_get_flags);

int ethtool_op_set_flags(struct net_device *dev, u32 data)
{
	const struct ethtool_ops *ops = dev->ethtool_ops;
	unsigned long features = dev->features;

	if (data & ETH_FLAG_LRO)
		features |= NETIF_F_LRO;
	else
		features &= ~NETIF_F_LRO;

	if (data & ETH_FLAG_NTUPLE) {
		if (!ops->set_rx_ntuple)
			return -EOPNOTSUPP;
		features |= NETIF_F_NTUPLE;
	} else {
		/* safe to clear regardless */
		features &= ~NETIF_F_NTUPLE;
	}

	if (data & ETH_FLAG_RXHASH)
		features |= NETIF_F_RXHASH;
	else
		features &= ~NETIF_F_RXHASH;

	dev->features = features;
	return 0;
}
EXPORT_SYMBOL(ethtool_op_set_flags);

void ethtool_ntuple_flush(struct net_device *dev)
{
	struct ethtool_rx_ntuple_flow_spec_container *fsc, *f;

	list_for_each_entry_safe(fsc, f, &dev->ethtool_ntuple_list.list, list) {
		list_del(&fsc->list);
		kfree(fsc);
	}
	dev->ethtool_ntuple_list.count = 0;
}
EXPORT_SYMBOL(ethtool_ntuple_flush);

/* Handlers for each ethtool command */

static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_cmd cmd = { .cmd = ETHTOOL_GSET };
	int err;

	if (!dev->ethtool_ops->get_settings)
		return -EOPNOTSUPP;

	err = dev->ethtool_ops->get_settings(dev, &cmd);
	if (err < 0)
		return err;

	if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
		return -EFAULT;
	return 0;
}

static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_cmd cmd;

	if (!dev->ethtool_ops->set_settings)
		return -EOPNOTSUPP;

	if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
		return -EFAULT;

	return dev->ethtool_ops->set_settings(dev, &cmd);
}

static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
						  void __user *useraddr)
{
	struct ethtool_drvinfo info;
	const struct ethtool_ops *ops = dev->ethtool_ops;

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

	memset(&info, 0, sizeof(info));
	info.cmd = ETHTOOL_GDRVINFO;
	ops->get_drvinfo(dev, &info);

	/*
	 * this method of obtaining string set info is deprecated;
	 * Use ETHTOOL_GSSET_INFO instead.
	 */
	if (ops->get_sset_count) {
		int rc;

		rc = ops->get_sset_count(dev, ETH_SS_TEST);
		if (rc >= 0)
			info.testinfo_len = rc;
		rc = ops->get_sset_count(dev, ETH_SS_STATS);
		if (rc >= 0)
			info.n_stats = rc;
		rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
		if (rc >= 0)
			info.n_priv_flags = rc;
	}
	if (ops->get_regs_len)
		info.regdump_len = ops->get_regs_len(dev);
	if (ops->get_eeprom_len)
		info.eedump_len = ops->get_eeprom_len(dev);

	if (copy_to_user(useraddr, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
						    void __user *useraddr)
{
	struct ethtool_sset_info info;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	u64 sset_mask;
	int i, idx = 0, n_bits = 0, ret, rc;
	u32 *info_buf = NULL;

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

	if (copy_from_user(&info, use