ethtool.c

linux 内核源代码

/*
 * net/core/ethtool.c - Ethtool ioctl handler
 * Copyright (c) 2003 Matthew Wilcox <[e-mail]>
 *
 * 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 <asm/uaccess.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;
}

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

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;
}

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;
}

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

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;
}

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

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;
}

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

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;
}

/* 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;

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;
}

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

	return 0;
}

/* Handlers for each ethtool command */

static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_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 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);

	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;
	} else {
		/* code path for obsolete hooks */

		if (ops->self_test_count)
			info.testinfo_len = ops->self_test_count(dev);
		if (ops->get_stats_count)
			info.n_stats = ops->get_stats_count(dev);
	}
	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 int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_regs regs;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	void *regbuf;
	int reglen, ret;

	if (!ops->get_regs || !ops->get_regs_len)
		return -EOPNOTSUPP;

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

	reglen = ops->get_regs_len(dev);
	if (regs.len > reglen)
		regs.len = reglen;

	regbuf = kmalloc(reglen, GFP_USER);
	if (!regbuf)
		return -ENOMEM;

	ops->get_regs(dev, &regs, regbuf);

	ret = -EFAULT;
	if (copy_to_user(useraddr, &regs, sizeof(regs)))
		goto out;
	useraddr += offsetof(struct ethtool_regs, data);
	if (copy_to_user(useraddr, regbuf, regs.len))
		goto out;
	ret = 0;

 out:
	kfree(regbuf);
	return ret;
}

static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_wolinfo wol = { ETHTOOL_GWOL };

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

	dev->ethtool_ops->get_wol(dev, &wol);

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

static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_wolinfo wol;

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

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

	return dev->ethtool_ops->set_wol(dev, &wol);
}

static int ethtool_nway_reset(struct net_device *dev)
{
	if (!dev->ethtool_ops->nway_reset)
		return -EOPNOTSUPP;

	return dev->ethtool_ops->nway_reset(dev);
}

static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_eeprom eeprom;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	u8 *data;
	int ret;

	if (!ops->get_eeprom || !ops->get_eeprom_len)
		return -EOPNOTSUPP;

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

	/* Check for wrap and zero */
	if (eeprom.offset + eeprom.len <= eeprom.offset)
		return -EINVAL;

	/* Check for exceeding total eeprom len */
	if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
		return -EINVAL;

	data = kmalloc(eeprom.len, GFP_USER);
	if (!data)
		return -ENOMEM;

	ret = -EFAULT;
	if (copy_from_user(data, useraddr + sizeof(eeprom), eeprom.len))
		goto out;

	ret = ops->get_eeprom(dev, &eeprom, data);
	if (ret)
		goto out;

	ret = -EFAULT;
	if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
		goto out;
	if (copy_to_user(useraddr + sizeof(eeprom), data, eeprom.len))
		goto out;
	ret = 0;

 out:
	kfree(data);
	return ret;
}

static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_eeprom eeprom;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	u8 *data;
	int ret;

	if (!ops->set_eeprom || !ops->get_eeprom_len)
		return -EOPNOTSUPP;

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

	/* Check for wrap and zero */
	if (eeprom.offset + eeprom.len <= eeprom.offset)
		return -EINVAL;

	/* Check for exceeding total eeprom len */
	if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
		return -EINVAL;

	data = kmalloc(eeprom.len, GFP_USER);
	if (!data)
		return -ENOMEM;

	ret = -EFAULT;
	if (copy_from_user(data, useraddr + sizeof(eeprom), eeprom.len))
		goto out;

	ret = ops->set_eeprom(dev, &eeprom, data);
	if (ret)
		goto out;

	if (copy_to_user(useraddr + sizeof(eeprom), data, eeprom.len))
		ret = -EFAULT;

 out:
	kfree(data);
	return ret;
}

static int ethtool_get_coalesce(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_coalesce coalesce = { ETHTOOL_GCOALESCE };

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

	dev->ethtool_ops->get_coalesce(dev, &coalesce);

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

static int ethtool_set_coalesce(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_coalesce coalesce;

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

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

	return dev->ethtool_ops->set_coalesce(dev, &coalesce);
}

static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_ringparam ringparam = { ETHTOOL_GRINGPARAM };

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

	dev->ethtool_ops->get_ringparam(dev, &ringparam);

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

static int ethtool_set_ringparam(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_ringparam ringparam;

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

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

	return dev->ethtool_ops->set_ringparam(dev, &ringparam);
}

static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM };

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

	dev->ethtool_ops->get_pauseparam(dev, &pauseparam);

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

static int ethtool_set_pauseparam(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_pauseparam pauseparam;

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

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

	return dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
}

static int __ethtool_set_sg(struct net_device *dev, u32 data)
{
	int err;

	if (!data && dev->ethtool_ops->set_tso) {
		err = dev->ethtool_ops->set_tso(dev, 0);
		if (err)
			return err;
	}

	if (!data && dev->ethtool_ops->set_ufo) {
		err = dev->ethtool_ops->set_ufo(dev, 0);
		if (err)
			return err;
	}
	return dev->ethtool_ops->set_sg(dev, data);
}

static int ethtool_set_tx_csum(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_value edata;
	int err;

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

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

	if (!edata.data && dev->ethtool_ops->set_sg) {
		err = __ethtool_set_sg(dev, 0);
		if (err)
			return err;
	}

	return dev->ethtool_ops->set_tx_csum(dev, edata.data);
}

static int ethtool_set_sg(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_value edata;

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

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