ethtool.c 43.7 KB
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/*
 * 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
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 * the information ethtool needs.
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 *
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 * 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.
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 */

#include <linux/module.h>
#include <linux/types.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
#include <linux/ethtool.h>
#include <linux/netdevice.h>
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#include <linux/bitops.h>
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#include <linux/uaccess.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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/*
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 * 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;
}
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EXPORT_SYMBOL(ethtool_op_get_link);
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u32 ethtool_op_get_rx_csum(struct net_device *dev)
{
	return (dev->features & NETIF_F_ALL_CSUM) != 0;
}
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EXPORT_SYMBOL(ethtool_op_get_rx_csum);
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u32 ethtool_op_get_tx_csum(struct net_device *dev)
{
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	return (dev->features & NETIF_F_ALL_CSUM) != 0;
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}
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EXPORT_SYMBOL(ethtool_op_get_tx_csum);
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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;
}
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EXPORT_SYMBOL(ethtool_op_set_tx_csum);
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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;
}
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EXPORT_SYMBOL(ethtool_op_set_tx_hw_csum);
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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;
}
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EXPORT_SYMBOL(ethtool_op_set_tx_ipv6_csum);
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u32 ethtool_op_get_sg(struct net_device *dev)
{
	return (dev->features & NETIF_F_SG) != 0;
}
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EXPORT_SYMBOL(ethtool_op_get_sg);
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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;
}
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EXPORT_SYMBOL(ethtool_op_set_sg);
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u32 ethtool_op_get_tso(struct net_device *dev)
{
	return (dev->features & NETIF_F_TSO) != 0;
}
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EXPORT_SYMBOL(ethtool_op_get_tso);
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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;
}
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EXPORT_SYMBOL(ethtool_op_set_tso);
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u32 ethtool_op_get_ufo(struct net_device *dev)
{
	return (dev->features & NETIF_F_UFO) != 0;
}
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EXPORT_SYMBOL(ethtool_op_get_ufo);
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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;
}
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EXPORT_SYMBOL(ethtool_op_set_ufo);
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/* 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 =
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	(ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | ETH_FLAG_NTUPLE |
	 ETH_FLAG_RXHASH);
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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;
}
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EXPORT_SYMBOL(ethtool_op_get_flags);
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int ethtool_op_set_flags(struct net_device *dev, u32 data, u32 supported)
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{
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	if (data & ~supported)
		return -EINVAL;
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	dev->features = ((dev->features & ~flags_dup_features) |
			 (data & flags_dup_features));
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	return 0;
}
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EXPORT_SYMBOL(ethtool_op_set_flags);
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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);

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/* Handlers for each ethtool command */

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#define ETHTOOL_DEV_FEATURE_WORDS	1

static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_gfeatures cmd = {
		.cmd = ETHTOOL_GFEATURES,
		.size = ETHTOOL_DEV_FEATURE_WORDS,
	};
	struct ethtool_get_features_block features[ETHTOOL_DEV_FEATURE_WORDS] = {
		{
			.available = dev->hw_features,
			.requested = dev->wanted_features,
			.active = dev->features,
			.never_changed = NETIF_F_NEVER_CHANGE,
		},
	};
	u32 __user *sizeaddr;
	u32 copy_size;

	sizeaddr = useraddr + offsetof(struct ethtool_gfeatures, size);
	if (get_user(copy_size, sizeaddr))
		return -EFAULT;

	if (copy_size > ETHTOOL_DEV_FEATURE_WORDS)
		copy_size = ETHTOOL_DEV_FEATURE_WORDS;

	if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
		return -EFAULT;
	useraddr += sizeof(cmd);
	if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
		return -EFAULT;

	return 0;
}

static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_sfeatures cmd;
	struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
	int ret = 0;

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

	if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
		return -EINVAL;

	if (copy_from_user(features, useraddr, sizeof(features)))
		return -EFAULT;

	if (features[0].valid & ~NETIF_F_ETHTOOL_BITS)
		return -EINVAL;

	if (features[0].valid & ~dev->hw_features) {
		features[0].valid &= dev->hw_features;
		ret |= ETHTOOL_F_UNSUPPORTED;
	}

	dev->wanted_features &= ~features[0].valid;
	dev->wanted_features |= features[0].valid & features[0].requested;
	netdev_update_features(dev);

	if ((dev->wanted_features ^ dev->features) & features[0].valid)
		ret |= ETHTOOL_F_WISH;

	return ret;
}

static const char netdev_features_strings[ETHTOOL_DEV_FEATURE_WORDS * 32][ETH_GSTRING_LEN] = {
	/* NETIF_F_SG */              "tx-scatter-gather",
	/* NETIF_F_IP_CSUM */         "tx-checksum-ipv4",
	/* NETIF_F_NO_CSUM */         "tx-checksum-unneeded",
	/* NETIF_F_HW_CSUM */         "tx-checksum-ip-generic",
	/* NETIF_F_IPV6_CSUM */       "tx_checksum-ipv6",
	/* NETIF_F_HIGHDMA */         "highdma",
	/* NETIF_F_FRAGLIST */        "tx-scatter-gather-fraglist",
	/* NETIF_F_HW_VLAN_TX */      "tx-vlan-hw-insert",

	/* NETIF_F_HW_VLAN_RX */      "rx-vlan-hw-parse",
	/* NETIF_F_HW_VLAN_FILTER */  "rx-vlan-filter",
	/* NETIF_F_VLAN_CHALLENGED */ "vlan-challenged",
	/* NETIF_F_GSO */             "tx-generic-segmentation",
	/* NETIF_F_LLTX */            "tx-lockless",
	/* NETIF_F_NETNS_LOCAL */     "netns-local",
	/* NETIF_F_GRO */             "rx-gro",
	/* NETIF_F_LRO */             "rx-lro",

	/* NETIF_F_TSO */             "tx-tcp-segmentation",
	/* NETIF_F_UFO */             "tx-udp-fragmentation",
	/* NETIF_F_GSO_ROBUST */      "tx-gso-robust",
	/* NETIF_F_TSO_ECN */         "tx-tcp-ecn-segmentation",
	/* NETIF_F_TSO6 */            "tx-tcp6-segmentation",
	/* NETIF_F_FSO */             "tx-fcoe-segmentation",
	"",
	"",

	/* NETIF_F_FCOE_CRC */        "tx-checksum-fcoe-crc",
	/* NETIF_F_SCTP_CSUM */       "tx-checksum-sctp",
	/* NETIF_F_FCOE_MTU */        "fcoe-mtu",
	/* NETIF_F_NTUPLE */          "rx-ntuple-filter",
	/* NETIF_F_RXHASH */          "rx-hashing",
	"",
	"",
	"",
};

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static int __ethtool_get_sset_count(struct net_device *dev, int sset)
{
	const struct ethtool_ops *ops = dev->ethtool_ops;

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	if (sset == ETH_SS_FEATURES)
		return ARRAY_SIZE(netdev_features_strings);

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	if (ops && ops->get_sset_count && ops->get_strings)
		return ops->get_sset_count(dev, sset);
	else
		return -EOPNOTSUPP;
}

static void __ethtool_get_strings(struct net_device *dev,
	u32 stringset, u8 *data)
{
	const struct ethtool_ops *ops = dev->ethtool_ops;

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	if (stringset == ETH_SS_FEATURES)
		memcpy(data, netdev_features_strings,
			sizeof(netdev_features_strings));
	else
		/* ops->get_strings is valid because checked earlier */
		ops->get_strings(dev, stringset, data);
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}

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static u32 ethtool_get_feature_mask(u32 eth_cmd)
{
	/* feature masks of legacy discrete ethtool ops */

	switch (eth_cmd) {
	case ETHTOOL_GTXCSUM:
	case ETHTOOL_STXCSUM:
		return NETIF_F_ALL_CSUM | NETIF_F_SCTP_CSUM;
	case ETHTOOL_GSG:
	case ETHTOOL_SSG:
		return NETIF_F_SG;
	case ETHTOOL_GTSO:
	case ETHTOOL_STSO:
		return NETIF_F_ALL_TSO;
	case ETHTOOL_GUFO:
	case ETHTOOL_SUFO:
		return NETIF_F_UFO;
	case ETHTOOL_GGSO:
	case ETHTOOL_SGSO:
		return NETIF_F_GSO;
	case ETHTOOL_GGRO:
	case ETHTOOL_SGRO:
		return NETIF_F_GRO;
	default:
		BUG();
	}
}

static void *__ethtool_get_one_feature_actor(struct net_device *dev, u32 ethcmd)
{
	const struct ethtool_ops *ops = dev->ethtool_ops;

	if (!ops)
		return NULL;

	switch (ethcmd) {
	case ETHTOOL_GTXCSUM:
		return ops->get_tx_csum;
	case ETHTOOL_SSG:
		return ops->get_sg;
	case ETHTOOL_STSO:
		return ops->get_tso;
	case ETHTOOL_SUFO:
		return ops->get_ufo;
	default:
		return NULL;
	}
}

static int ethtool_get_one_feature(struct net_device *dev,
	char __user *useraddr, u32 ethcmd)
{
	struct ethtool_value edata = {
		.cmd = ethcmd,
		.data = !!(dev->features & ethtool_get_feature_mask(ethcmd)),
	};
	u32 (*actor)(struct net_device *);

	actor = __ethtool_get_one_feature_actor(dev, ethcmd);
	if (actor)
		edata.data = actor(dev);

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

static int __ethtool_set_tx_csum(struct net_device *dev, u32 data);
static int __ethtool_set_sg(struct net_device *dev, u32 data);
static int __ethtool_set_tso(struct net_device *dev, u32 data);
static int __ethtool_set_ufo(struct net_device *dev, u32 data);

static int ethtool_set_one_feature(struct net_device *dev,
	void __user *useraddr, u32 ethcmd)
{
	struct ethtool_value edata;
	u32 mask;

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

	switch (ethcmd) {
	case ETHTOOL_STXCSUM:
		return __ethtool_set_tx_csum(dev, edata.data);
	case ETHTOOL_SSG:
		return __ethtool_set_sg(dev, edata.data);
	case ETHTOOL_STSO:
		return __ethtool_set_tso(dev, edata.data);
	case ETHTOOL_SUFO:
		return __ethtool_set_ufo(dev, edata.data);
	case ETHTOOL_SGSO:
	case ETHTOOL_SGRO:
		mask = ethtool_get_feature_mask(ethcmd);
		if (edata.data)
			dev->features |= mask;
		else
			dev->features &= ~mask;
		return 0;
	default:
		return -EOPNOTSUPP;
	}
}

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

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static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
						  void __user *useraddr)
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{
	struct ethtool_drvinfo info;
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	const struct ethtool_ops *ops = dev->ethtool_ops;
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	memset(&info, 0, sizeof(info));
	info.cmd = ETHTOOL_GDRVINFO;
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	if (ops && ops->get_drvinfo) {
		ops->get_drvinfo(dev, &info);
	} else if (dev->dev.parent && dev->dev.parent->driver) {
		strlcpy(info.bus_info, dev_name(dev->dev.parent),
			sizeof(info.bus_info));
		strlcpy(info.driver, dev->dev.parent->driver->name,
			sizeof(info.driver));
	} else {
		return -EOPNOTSUPP;
	}
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	/*
	 * this method of obtaining string set info is deprecated;
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	 * Use ETHTOOL_GSSET_INFO instead.
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	 */
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	if (ops && ops->get_sset_count) {
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		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;
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		rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
		if (rc >= 0)
			info.n_priv_flags = rc;
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	}
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	if (ops && ops->get_regs_len)
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		info.regdump_len = ops->get_regs_len(dev);
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	if (ops && ops->get_eeprom_len)
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		info.eedump_len = ops->get_eeprom_len(dev);

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

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

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

	/* store copy of mask, because we zero struct later on */
	sset_mask = info.sset_mask;
	if (!sset_mask)
		return 0;

	/* calculate size of return buffer */
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	n_bits = hweight64(sset_mask);
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	memset(&info, 0, sizeof(info));
	info.cmd = ETHTOOL_GSSET_INFO;

	info_buf = kzalloc(n_bits * sizeof(u32), GFP_USER);
	if (!info_buf)
		return -ENOMEM;

	/*
	 * fill return buffer based on input bitmask and successful
	 * get_sset_count return
	 */
	for (i = 0; i < 64; i++) {
		if (!(sset_mask & (1ULL << i)))
			continue;

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		rc = __ethtool_get_sset_count(dev, i);
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		if (rc >= 0) {
			info.sset_mask |= (1ULL << i);
			info_buf[idx++] = rc;
		}
	}

	ret = -EFAULT;
	if (copy_to_user(useraddr, &info, sizeof(info)))
		goto out;

	useraddr += offsetof(struct ethtool_sset_info, data);
	if (copy_to_user(useraddr, info_buf, idx * sizeof(u32)))
		goto out;

	ret = 0;

out:
	kfree(info_buf);
	return ret;
}

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static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
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						u32 cmd, void __user *useraddr)
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{
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	struct ethtool_rxnfc info;
	size_t info_size = sizeof(info);
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	if (!dev->ethtool_ops->set_rxnfc)
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		return -EOPNOTSUPP;

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	/* struct ethtool_rxnfc was originally defined for
	 * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
	 * members.  User-space might still be using that
	 * definition. */
	if (cmd == ETHTOOL_SRXFH)
		info_size = (offsetof(struct ethtool_rxnfc, data) +
			     sizeof(info.data));

	if (copy_from_user(&info, useraddr, info_size))
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		return -EFAULT;

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	return dev->ethtool_ops->set_rxnfc(dev, &info);
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}

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static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
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						u32 cmd, void __user *useraddr)
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{
	struct ethtool_rxnfc info;
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	size_t info_size = sizeof(info);
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	const struct ethtool_ops *ops = dev->ethtool_ops;
	int ret;
	void *rule_buf = NULL;
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	if (!ops->get_rxnfc)
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		return -EOPNOTSUPP;

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	/* struct ethtool_rxnfc was originally defined for
	 * ETHTOOL_{G,S}RXFH with only the cmd, flow_type and data
	 * members.  User-space might still be using that
	 * definition. */
	if (cmd == ETHTOOL_GRXFH)
		info_size = (offsetof(struct ethtool_rxnfc, data) +
			     sizeof(info.data));

	if (copy_from_user(&info, useraddr, info_size))
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		return -EFAULT;

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	if (info.cmd == ETHTOOL_GRXCLSRLALL) {
		if (info.rule_cnt > 0) {
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			if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
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				rule_buf = kzalloc(info.rule_cnt * sizeof(u32),
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						   GFP_USER);
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			if (!rule_buf)
				return -ENOMEM;
		}
	}
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	ret = ops->get_rxnfc(dev, &info, rule_buf);
	if (ret < 0)
		goto err_out;

	ret = -EFAULT;
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	if (copy_to_user(useraddr, &info, info_size))
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		goto err_out;

	if (rule_buf) {
		useraddr += offsetof(struct ethtool_rxnfc, rule_locs);
		if (copy_to_user(useraddr, rule_buf,
				 info.rule_cnt * sizeof(u32)))
			goto err_out;
	}
	ret = 0;

err_out:
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	kfree(rule_buf);
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	return ret;
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}

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static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
						     void __user *useraddr)
{
	struct ethtool_rxfh_indir *indir;
	u32 table_size;
	size_t full_size;
	int ret;

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

	if (copy_from_user(&table_size,
			   useraddr + offsetof(struct ethtool_rxfh_indir, size),
			   sizeof(table_size)))
		return -EFAULT;

	if (table_size >
	    (KMALLOC_MAX_SIZE - sizeof(*indir)) / sizeof(*indir->ring_index))
		return -ENOMEM;
	full_size = sizeof(*indir) + sizeof(*indir->ring_index) * table_size;
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	indir = kzalloc(full_size, GFP_USER);
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	if (!indir)
		return -ENOMEM;

	indir->cmd = ETHTOOL_GRXFHINDIR;
	indir->size = table_size;
	ret = dev->ethtool_ops->get_rxfh_indir(dev, indir);
	if (ret)
		goto out;

	if (copy_to_user(useraddr, indir, full_size))
		ret = -EFAULT;

out:
	kfree(indir);
	return ret;
}

static noinline_for_stack int ethtool_set_rxfh_indir(struct net_device *dev,
						     void __user *useraddr)
{
	struct ethtool_rxfh_indir *indir;
	u32 table_size;
	size_t full_size;
	int ret;

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

	if (copy_from_user(&table_size,
			   useraddr + offsetof(struct ethtool_rxfh_indir, size),
			   sizeof(table_size)))
		return -EFAULT;

	if (table_size >
	    (KMALLOC_MAX_SIZE - sizeof(*indir)) / sizeof(*indir->ring_index))
		return -ENOMEM;
	full_size = sizeof(*indir) + sizeof(*indir->ring_index) * table_size;
	indir = kmalloc(full_size, GFP_USER);
	if (!indir)
		return -ENOMEM;

	if (copy_from_user(indir, useraddr, full_size)) {
		ret = -EFAULT;
		goto out;
	}

	ret = dev->ethtool_ops->set_rxfh_indir(dev, indir);

out:
	kfree(indir);
	return ret;
}

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static void __rx_ntuple_filter_add(struct ethtool_rx_ntuple_list *list,
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			struct ethtool_rx_ntuple_flow_spec *spec,
			struct ethtool_rx_ntuple_flow_spec_container *fsc)
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{

	/* don't add filters forever */
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	if (list->count >= ETHTOOL_MAX_NTUPLE_LIST_ENTRY) {
		/* free the container */
		kfree(fsc);
		return;
	}
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	/* Copy the whole filter over */
	fsc->fs.flow_type = spec->flow_type;
	memcpy(&fsc->fs.h_u, &spec->h_u, sizeof(spec->h_u));
	memcpy(&fsc->fs.m_u, &spec->m_u, sizeof(spec->m_u));

	fsc->fs.vlan_tag = spec->vlan_tag;
	fsc->fs.vlan_tag_mask = spec->vlan_tag_mask;
	fsc->fs.data = spec->data;
	fsc->fs.data_mask = spec->data_mask;
	fsc->fs.action = spec->action;

	/* add to the list */
	list_add_tail_rcu(&fsc->list, &list->list);
	list->count++;
}

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/*
 * ethtool does not (or did not) set masks for flow parameters that are
 * not specified, so if both value and mask are 0 then this must be
 * treated as equivalent to a mask with all bits set.  Implement that
 * here rather than in drivers.
 */
static void rx_ntuple_fix_masks(struct ethtool_rx_ntuple_flow_spec *fs)
{
	struct ethtool_tcpip4_spec *entry = &fs->h_u.tcp_ip4_spec;
	struct ethtool_tcpip4_spec *mask = &fs->m_u.tcp_ip4_spec;

	if (fs->flow_type != TCP_V4_FLOW &&
	    fs->flow_type != UDP_V4_FLOW &&
	    fs->flow_type != SCTP_V4_FLOW)
		return;

	if (!(entry->ip4src | mask->ip4src))
		mask->ip4src = htonl(0xffffffff);
	if (!(entry->ip4dst | mask->ip4dst))
		mask->ip4dst = htonl(0xffffffff);
	if (!(entry->psrc | mask->psrc))
		mask->psrc = htons(0xffff);
	if (!(entry->pdst | mask->pdst))
		mask->pdst = htons(0xffff);
	if (!(entry->tos | mask->tos))
		mask->tos = 0xff;
	if (!(fs->vlan_tag | fs->vlan_tag_mask))
		fs->vlan_tag_mask = 0xffff;
	if (!(fs->data | fs->data_mask))
		fs->data_mask = 0xffffffffffffffffULL;
}

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static noinline_for_stack int ethtool_set_rx_ntuple(struct net_device *dev,
						    void __user *useraddr)
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{
	struct ethtool_rx_ntuple cmd;
	const struct ethtool_ops *ops = dev->ethtool_ops;
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	struct ethtool_rx_ntuple_flow_spec_container *fsc = NULL;
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	int ret;

	if (!(dev->features & NETIF_F_NTUPLE))
		return -EINVAL;

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

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	rx_ntuple_fix_masks(&cmd.fs);

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	/*
	 * Cache filter in dev struct for GET operation only if
	 * the underlying driver doesn't have its own GET operation, and
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	 * only if the filter was added successfully.  First make sure we
	 * can allocate the filter, then continue if successful.
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	 */
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	if (!ops->get_rx_ntuple) {
		fsc = kmalloc(sizeof(*fsc), GFP_ATOMIC);
		if (!fsc)
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			return -ENOMEM;
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	}

	ret = ops->set_rx_ntuple(dev, &cmd);
	if (ret) {
		kfree(fsc);
		return ret;
	}

	if (!ops->get_rx_ntuple)
		__rx_ntuple_filter_add(&dev->ethtool_ntuple_list, &cmd.fs, fsc);
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	return ret;
}

static int ethtool_get_rx_ntuple(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_gstrings gstrings;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	struct ethtool_rx_ntuple_flow_spec_container *fsc;
	u8 *data;
	char *p;
	int ret, i, num_strings = 0;

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

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

	ret = ops->get_sset_count(dev, gstrings.string_set);
	if (ret < 0)
		return ret;

	gstrings.len = ret;

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	data = kzalloc(gstrings.len * ETH_GSTRING_LEN, GFP_USER);
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	if (!data)
		return -ENOMEM;

	if (ops->get_rx_ntuple) {
		/* driver-specific filter grab */
		ret = ops->get_rx_ntuple(dev, gstrings.string_set, data);
		goto copy;
	}

	/* default ethtool filter grab */
	i = 0;
	p = (char *)data;
	list_for_each_entry(fsc, &dev->ethtool_ntuple_list.list, list) {
		sprintf(p, "Filter %d:\n", i);
		p += ETH_GSTRING_LEN;
		num_strings++;

		switch (fsc->fs.flow_type) {
		case TCP_V4_FLOW:
			sprintf(p, "\tFlow Type: TCP\n");
			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case UDP_V4_FLOW:
			sprintf(p, "\tFlow Type: UDP\n");
			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case SCTP_V4_FLOW:
			sprintf(p, "\tFlow Type: SCTP\n");
			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case AH_ESP_V4_FLOW:
			sprintf(p, "\tFlow Type: AH ESP\n");
			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case ESP_V4_FLOW:
			sprintf(p, "\tFlow Type: ESP\n");
			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case IP_USER_FLOW:
			sprintf(p, "\tFlow Type: Raw IP\n");
			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case IPV4_FLOW:
			sprintf(p, "\tFlow Type: IPv4\n");
			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		default:
			sprintf(p, "\tFlow Type: Unknown\n");
			p += ETH_GSTRING_LEN;
			num_strings++;
			goto unknown_filter;
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		}
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		/* now the rest of the filters */
		switch (fsc->fs.flow_type) {
		case TCP_V4_FLOW:
		case UDP_V4_FLOW:
		case SCTP_V4_FLOW:
			sprintf(p, "\tSrc IP addr: 0x%x\n",
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				fsc->fs.h_u.tcp_ip4_spec.ip4src);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tSrc IP mask: 0x%x\n",
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				fsc->fs.m_u.tcp_ip4_spec.ip4src);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest IP addr: 0x%x\n",
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				fsc->fs.h_u.tcp_ip4_spec.ip4dst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest IP mask: 0x%x\n",
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				fsc->fs.m_u.tcp_ip4_spec.ip4dst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tSrc Port: %d, mask: 0x%x\n",
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				fsc->fs.h_u.tcp_ip4_spec.psrc,
				fsc->fs.m_u.tcp_ip4_spec.psrc);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest Port: %d, mask: 0x%x\n",
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				fsc->fs.h_u.tcp_ip4_spec.pdst,
				fsc->fs.m_u.tcp_ip4_spec.pdst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tTOS: %d, mask: 0x%x\n",
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				fsc->fs.h_u.tcp_ip4_spec.tos,
				fsc->fs.m_u.tcp_ip4_spec.tos);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case AH_ESP_V4_FLOW:
		case ESP_V4_FLOW:
			sprintf(p, "\tSrc IP addr: 0x%x\n",
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				fsc->fs.h_u.ah_ip4_spec.ip4src);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tSrc IP mask: 0x%x\n",
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				fsc->fs.m_u.ah_ip4_spec.ip4src);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest IP addr: 0x%x\n",
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				fsc->fs.h_u.ah_ip4_spec.ip4dst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest IP mask: 0x%x\n",
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				fsc->fs.m_u.ah_ip4_spec.ip4dst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tSPI: %d, mask: 0x%x\n",
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				fsc->fs.h_u.ah_ip4_spec.spi,
				fsc->fs.m_u.ah_ip4_spec.spi);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tTOS: %d, mask: 0x%x\n",
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				fsc->fs.h_u.ah_ip4_spec.tos,
				fsc->fs.m_u.ah_ip4_spec.tos);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case IP_USER_FLOW:
			sprintf(p, "\tSrc IP addr: 0x%x\n",
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				fsc->fs.h_u.usr_ip4_spec.ip4src);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tSrc IP mask: 0x%x\n",
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				fsc->fs.m_u.usr_ip4_spec.ip4src);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest IP addr: 0x%x\n",
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				fsc->fs.h_u.usr_ip4_spec.ip4dst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest IP mask: 0x%x\n",
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				fsc->fs.m_u.usr_ip4_spec.ip4dst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
		case IPV4_FLOW:
			sprintf(p, "\tSrc IP addr: 0x%x\n",
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				fsc->fs.h_u.usr_ip4_spec.ip4src);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tSrc IP mask: 0x%x\n",
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				fsc->fs.m_u.usr_ip4_spec.ip4src);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest IP addr: 0x%x\n",
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				fsc->fs.h_u.usr_ip4_spec.ip4dst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tDest IP mask: 0x%x\n",
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				fsc->fs.m_u.usr_ip4_spec.ip4dst);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tL4 bytes: 0x%x, mask: 0x%x\n",
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				fsc->fs.h_u.usr_ip4_spec.l4_4_bytes,
				fsc->fs.m_u.usr_ip4_spec.l4_4_bytes);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tTOS: %d, mask: 0x%x\n",
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				fsc->fs.h_u.usr_ip4_spec.tos,
				fsc->fs.m_u.usr_ip4_spec.tos);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tIP Version: %d, mask: 0x%x\n",
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				fsc->fs.h_u.usr_ip4_spec.ip_ver,
				fsc->fs.m_u.usr_ip4_spec.ip_ver);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			sprintf(p, "\tProtocol: %d, mask: 0x%x\n",
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				fsc->fs.h_u.usr_ip4_spec.proto,
				fsc->fs.m_u.usr_ip4_spec.proto);
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			p += ETH_GSTRING_LEN;
			num_strings++;
			break;
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		}
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		sprintf(p, "\tVLAN: %d, mask: 0x%x\n",
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			fsc->fs.vlan_tag, fsc->fs.vlan_tag_mask);
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		p += ETH_GSTRING_LEN;
		num_strings++;
		sprintf(p, "\tUser-defined: 0x%Lx\n", fsc->fs.data);
		p += ETH_GSTRING_LEN;
		num_strings++;
		sprintf(p, "\tUser-defined mask: 0x%Lx\n", fsc->fs.data_mask);
		p += ETH_GSTRING_LEN;
		num_strings++;
		if (fsc->fs.action == ETHTOOL_RXNTUPLE_ACTION_DROP)
			sprintf(p, "\tAction: Drop\n");
		else
			sprintf(p, "\tAction: Direct to queue %d\n",
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				fsc->fs.action);
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		p += ETH_GSTRING_LEN;
		num_strings++;
unknown_filter:
		i++;
	}
copy:
	/* indicate to userspace how many strings we actually have */
	gstrings.len = num_strings;
	ret = -EFAULT;
	if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
		goto out;
	useraddr += sizeof(gstrings);
	if (copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
		goto out;
	ret = 0;

out:
	kfree(data);
	return ret;
}

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static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_regs regs;
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	const struct ethtool_ops *ops = dev->ethtool_ops;
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	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;

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	regbuf = vzalloc(reglen);
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	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:
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	vfree(regbuf);
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	return ret;
}

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static int ethtool_reset(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_value reset;
	int ret;

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

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

	ret = dev->ethtool_ops->reset(dev, &reset.data);
	if (ret)
		return ret;

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

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

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static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };

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

	edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);

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

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static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_eeprom eeprom;
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	const struct ethtool_ops *ops = dev->ethtool_ops;
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	void __user *userbuf = useraddr + sizeof(eeprom);
	u32 bytes_remaining;
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	u8 *data;
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	int ret = 0;
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	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;

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	data = kmalloc(PAGE_SIZE, GFP_USER);
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	if (!data)
		return -ENOMEM;

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	bytes_remaining = eeprom.len;
	while (bytes_remaining > 0) {
		eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);

		ret = ops->get_eeprom(dev, &eeprom, data);
		if (ret)
			break;
		if (copy_to_user(userbuf, data, eeprom.len)) {
			ret = -EFAULT;
			break;
		}
		userbuf += eeprom.len;
		eeprom.offset += eeprom.len;
		bytes_remaining -= eeprom.len;
	}
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	eeprom.len = userbuf - (useraddr + sizeof(eeprom));
	eeprom.offset -= eeprom.len;
	if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
		ret = -EFAULT;

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	kfree(data);
	return ret;
}

static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_eeprom eeprom;
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	const struct ethtool_ops *ops = dev->ethtool_ops;
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	void __user *userbuf = useraddr + sizeof(eeprom);
	u32 bytes_remaining;
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	u8 *data;
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	int ret = 0;
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	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;

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	data = kmalloc(PAGE_SIZE, GFP_USER);
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	if (!data)
		return -ENOMEM;

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	bytes_remaining = eeprom.len;
	while (bytes_remaining > 0) {
		eeprom.len = min(bytes_remaining, (u32)PAGE_SIZE);

		if (copy_from_user(data, userbuf, eeprom.len)) {
			ret = -EFAULT;
			break;
		}
		ret = ops->set_eeprom(dev, &eeprom, data);
		if (ret)
			break;
		userbuf += eeprom.len;
		eeprom.offset += eeprom.len;
		bytes_remaining -= eeprom.len;
	}
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	kfree(data);
	return ret;
}

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

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

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	if (!dev->ethtool_ops->set_coalesce)
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		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)
{
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	struct ethtool_ringparam ringparam = { .cmd = ETHTOOL_GRINGPARAM };
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	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;

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

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	if (data && !(dev->features & NETIF_F_ALL_CSUM))
		return -EINVAL;

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

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

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

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

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

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

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

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

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

	if (!edata.data && dev->ethtool_ops->set_sg)
		dev->features &= ~NETIF_F_GRO;

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

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static int __ethtool_set_tso(struct net_device *dev, u32 data)
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{
	if (!dev->ethtool_ops->set_tso)
		return -EOPNOTSUPP;

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	if (data && !(dev->features & NETIF_F_SG))
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		return -EINVAL;

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	return dev->ethtool_ops->set_tso(dev, data);
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}

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static int __ethtool_set_ufo(struct net_device *dev, u32 data)
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{
	if (!dev->ethtool_ops->set_ufo)
		return -EOPNOTSUPP;
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	if (data && !(dev->features & NETIF_F_SG))
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		return -EINVAL;
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	if (data && !((dev->features & NETIF_F_GEN_CSUM) ||
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		(dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
			== (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)))
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		return -EINVAL;
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	return dev->ethtool_ops->set_ufo(dev, data);
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}

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static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_test test;
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	const struct ethtool_ops *ops = dev->ethtool_ops;
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	u64 *data;
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	int ret, test_len;
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	if (!ops->self_test || !ops->get_sset_count)
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		return -EOPNOTSUPP;

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	test_len = ops->get_sset_count(dev, ETH_SS_TEST);
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	if (test_len < 0)
		return test_len;
	WARN_ON(test_len == 0);

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

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	test.len = test_len;
	data = kmalloc(test_len * sizeof(u64), GFP_USER);
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	if (!data)
		return -ENOMEM;

	ops->self_test(dev, &test, data);

	ret = -EFAULT;
	if (copy_to_user(useraddr, &test, sizeof(test)))
		goto out;
	useraddr += sizeof(test);
	if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
		goto out;
	ret = 0;

 out:
	kfree(data);
	return ret;
}

static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_gstrings gstrings;
	u8 *data;
	int ret;

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

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	ret = __ethtool_get_sset_count(dev, gstrings.string_set);
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	if (ret < 0)
		return ret;

	gstrings.len = ret;
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	data = kmalloc(gstrings.len * ETH_GSTRING_LEN, GFP_USER);
	if (!data)
		return -ENOMEM;

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	__ethtool_get_strings(dev, gstrings.string_set, data);
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	ret = -EFAULT;
	if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
		goto out;
	useraddr += sizeof(gstrings);
	if (copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
		goto out;
	ret = 0;

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out:
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	kfree(data);
	return ret;
}

static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_value id;

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

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

	return dev->ethtool_ops->phys_id(dev, id.data);
}

static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_stats stats;
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	const struct ethtool_ops *ops = dev->ethtool_ops;
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	u64 *data;
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	int ret, n_stats;
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	if (!ops->get_ethtool_stats || !ops->get_sset_count)
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		return -EOPNOTSUPP;

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	n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
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	if (n_stats < 0)
		return n_stats;
	WARN_ON(n_stats == 0);

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

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	stats.n_stats = n_stats;
	data = kmalloc(n_stats * sizeof(u64), GFP_USER);
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	if (!data)
		return -ENOMEM;

	ops->get_ethtool_stats(dev, &stats, data);

	ret = -EFAULT;
	if (copy_to_user(useraddr, &stats, sizeof(stats)))
		goto out;
	useraddr += sizeof(stats);
	if (copy_to_user(useraddr, data, stats.n_stats * sizeof(u64)))
		goto out;
	ret = 0;

 out:
	kfree(data);
	return ret;
}

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static int ethtool_get_perm_addr(struct net_device *dev, void __user *useraddr)
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{
	struct ethtool_perm_addr epaddr;

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	if (copy_from_user(&epaddr, useraddr, sizeof(epaddr)))
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