ioctl.c 78.3 KB
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// SPDX-License-Identifier: GPL-2.0-or-later
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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
 * the information ethtool needs.
 */

#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/net_tstamp.h>
#include <linux/phy.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
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#include <linux/vermagic.h>
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#include <linux/vmalloc.h>
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#include <linux/sfp.h>
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#include <linux/slab.h>
#include <linux/rtnetlink.h>
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#include <linux/sched/signal.h>
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#include <linux/net.h>
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#include <net/devlink.h>
#include <net/xdp_sock.h>
#include <net/flow_offload.h>
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#include <linux/ethtool_netlink.h>

#include "common.h"
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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;
}
EXPORT_SYMBOL(ethtool_op_get_link);

int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
{
	info->so_timestamping =
		SOF_TIMESTAMPING_TX_SOFTWARE |
		SOF_TIMESTAMPING_RX_SOFTWARE |
		SOF_TIMESTAMPING_SOFTWARE;
	info->phc_index = -1;
	return 0;
}
EXPORT_SYMBOL(ethtool_op_get_ts_info);

/* Handlers for each ethtool command */

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];
	u32 __user *sizeaddr;
	u32 copy_size;
	int i;

	/* in case feature bits run out again */
	BUILD_BUG_ON(ETHTOOL_DEV_FEATURE_WORDS * sizeof(u32) > sizeof(netdev_features_t));

	for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
		features[i].available = (u32)(dev->hw_features >> (32 * i));
		features[i].requested = (u32)(dev->wanted_features >> (32 * i));
		features[i].active = (u32)(dev->features >> (32 * i));
		features[i].never_changed =
			(u32)(NETIF_F_NEVER_CHANGE >> (32 * i));
	}

	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];
	netdev_features_t wanted = 0, valid = 0;
	int i, 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;

	for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; ++i) {
		valid |= (netdev_features_t)features[i].valid << (32 * i);
		wanted |= (netdev_features_t)features[i].requested << (32 * i);
	}

	if (valid & ~NETIF_F_ETHTOOL_BITS)
		return -EINVAL;

	if (valid & ~dev->hw_features) {
		valid &= dev->hw_features;
		ret |= ETHTOOL_F_UNSUPPORTED;
	}

	dev->wanted_features &= ~valid;
	dev->wanted_features |= wanted & valid;
	__netdev_update_features(dev);

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

	return ret;
}

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

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

	if (sset == ETH_SS_RSS_HASH_FUNCS)
		return ARRAY_SIZE(rss_hash_func_strings);

	if (sset == ETH_SS_TUNABLES)
		return ARRAY_SIZE(tunable_strings);

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	if (sset == ETH_SS_PHY_TUNABLES)
		return ARRAY_SIZE(phy_tunable_strings);

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	if (sset == ETH_SS_PHY_STATS && dev->phydev &&
	    !ops->get_ethtool_phy_stats)
		return phy_ethtool_get_sset_count(dev->phydev);
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	if (sset == ETH_SS_LINK_MODES)
		return __ETHTOOL_LINK_MODE_MASK_NBITS;

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	if (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;

	if (stringset == ETH_SS_FEATURES)
		memcpy(data, netdev_features_strings,
			sizeof(netdev_features_strings));
	else if (stringset == ETH_SS_RSS_HASH_FUNCS)
		memcpy(data, rss_hash_func_strings,
		       sizeof(rss_hash_func_strings));
	else if (stringset == ETH_SS_TUNABLES)
		memcpy(data, tunable_strings, sizeof(tunable_strings));
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	else if (stringset == ETH_SS_PHY_TUNABLES)
		memcpy(data, phy_tunable_strings, sizeof(phy_tunable_strings));
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	else if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
		 !ops->get_ethtool_phy_stats)
		phy_ethtool_get_strings(dev->phydev, data);
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	else if (stringset == ETH_SS_LINK_MODES)
		memcpy(data, link_mode_names,
		       __ETHTOOL_LINK_MODE_MASK_NBITS * ETH_GSTRING_LEN);
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	else
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		/* ops->get_strings is valid because checked earlier */
		ops->get_strings(dev, stringset, data);
}

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

	switch (eth_cmd) {
	case ETHTOOL_GTXCSUM:
	case ETHTOOL_STXCSUM:
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		return NETIF_F_CSUM_MASK | NETIF_F_FCOE_CRC |
		       NETIF_F_SCTP_CRC;
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	case ETHTOOL_GRXCSUM:
	case ETHTOOL_SRXCSUM:
		return NETIF_F_RXCSUM;
	case ETHTOOL_GSG:
	case ETHTOOL_SSG:
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		return NETIF_F_SG | NETIF_F_FRAGLIST;
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	case ETHTOOL_GTSO:
	case ETHTOOL_STSO:
		return NETIF_F_ALL_TSO;
	case ETHTOOL_GGSO:
	case ETHTOOL_SGSO:
		return NETIF_F_GSO;
	case ETHTOOL_GGRO:
	case ETHTOOL_SGRO:
		return NETIF_F_GRO;
	default:
		BUG();
	}
}

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

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

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

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

	mask = ethtool_get_feature_mask(ethcmd);
	mask &= dev->hw_features;
	if (!mask)
		return -EOPNOTSUPP;

	if (edata.data)
		dev->wanted_features |= mask;
	else
		dev->wanted_features &= ~mask;

	__netdev_update_features(dev);

	return 0;
}

#define ETH_ALL_FLAGS    (ETH_FLAG_LRO | ETH_FLAG_RXVLAN | ETH_FLAG_TXVLAN | \
			  ETH_FLAG_NTUPLE | ETH_FLAG_RXHASH)
#define ETH_ALL_FEATURES (NETIF_F_LRO | NETIF_F_HW_VLAN_CTAG_RX | \
			  NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_NTUPLE | \
			  NETIF_F_RXHASH)

static u32 __ethtool_get_flags(struct net_device *dev)
{
	u32 flags = 0;

	if (dev->features & NETIF_F_LRO)
		flags |= ETH_FLAG_LRO;
	if (dev->features & NETIF_F_HW_VLAN_CTAG_RX)
		flags |= ETH_FLAG_RXVLAN;
	if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
		flags |= ETH_FLAG_TXVLAN;
	if (dev->features & NETIF_F_NTUPLE)
		flags |= ETH_FLAG_NTUPLE;
	if (dev->features & NETIF_F_RXHASH)
		flags |= ETH_FLAG_RXHASH;

	return flags;
}

static int __ethtool_set_flags(struct net_device *dev, u32 data)
{
	netdev_features_t features = 0, changed;

	if (data & ~ETH_ALL_FLAGS)
		return -EINVAL;

	if (data & ETH_FLAG_LRO)
		features |= NETIF_F_LRO;
	if (data & ETH_FLAG_RXVLAN)
		features |= NETIF_F_HW_VLAN_CTAG_RX;
	if (data & ETH_FLAG_TXVLAN)
		features |= NETIF_F_HW_VLAN_CTAG_TX;
	if (data & ETH_FLAG_NTUPLE)
		features |= NETIF_F_NTUPLE;
	if (data & ETH_FLAG_RXHASH)
		features |= NETIF_F_RXHASH;

	/* allow changing only bits set in hw_features */
	changed = (features ^ dev->features) & ETH_ALL_FEATURES;
	if (changed & ~dev->hw_features)
		return (changed & dev->hw_features) ? -EINVAL : -EOPNOTSUPP;

	dev->wanted_features =
		(dev->wanted_features & ~changed) | (features & changed);

	__netdev_update_features(dev);

	return 0;
}

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/* Given two link masks, AND them together and save the result in dst. */
void ethtool_intersect_link_masks(struct ethtool_link_ksettings *dst,
				  struct ethtool_link_ksettings *src)
{
	unsigned int size = BITS_TO_LONGS(__ETHTOOL_LINK_MODE_MASK_NBITS);
	unsigned int idx = 0;

	for (; idx < size; idx++) {
		dst->link_modes.supported[idx] &=
			src->link_modes.supported[idx];
		dst->link_modes.advertising[idx] &=
			src->link_modes.advertising[idx];
	}
}
EXPORT_SYMBOL(ethtool_intersect_link_masks);

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void ethtool_convert_legacy_u32_to_link_mode(unsigned long *dst,
					     u32 legacy_u32)
{
	bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
	dst[0] = legacy_u32;
}
EXPORT_SYMBOL(ethtool_convert_legacy_u32_to_link_mode);

/* return false if src had higher bits set. lower bits always updated. */
bool ethtool_convert_link_mode_to_legacy_u32(u32 *legacy_u32,
					     const unsigned long *src)
{
	bool retval = true;

	/* TODO: following test will soon always be true */
	if (__ETHTOOL_LINK_MODE_MASK_NBITS > 32) {
		__ETHTOOL_DECLARE_LINK_MODE_MASK(ext);

		bitmap_zero(ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
		bitmap_fill(ext, 32);
		bitmap_complement(ext, ext, __ETHTOOL_LINK_MODE_MASK_NBITS);
		if (bitmap_intersects(ext, src,
				      __ETHTOOL_LINK_MODE_MASK_NBITS)) {
			/* src mask goes beyond bit 31 */
			retval = false;
		}
	}
	*legacy_u32 = src[0];
	return retval;
}
EXPORT_SYMBOL(ethtool_convert_link_mode_to_legacy_u32);

/* return false if ksettings link modes had higher bits
 * set. legacy_settings always updated (best effort)
 */
static bool
convert_link_ksettings_to_legacy_settings(
	struct ethtool_cmd *legacy_settings,
	const struct ethtool_link_ksettings *link_ksettings)
{
	bool retval = true;

	memset(legacy_settings, 0, sizeof(*legacy_settings));
	/* this also clears the deprecated fields in legacy structure:
	 * __u8		transceiver;
	 * __u32	maxtxpkt;
	 * __u32	maxrxpkt;
	 */

	retval &= ethtool_convert_link_mode_to_legacy_u32(
		&legacy_settings->supported,
		link_ksettings->link_modes.supported);
	retval &= ethtool_convert_link_mode_to_legacy_u32(
		&legacy_settings->advertising,
		link_ksettings->link_modes.advertising);
	retval &= ethtool_convert_link_mode_to_legacy_u32(
		&legacy_settings->lp_advertising,
		link_ksettings->link_modes.lp_advertising);
	ethtool_cmd_speed_set(legacy_settings, link_ksettings->base.speed);
	legacy_settings->duplex
		= link_ksettings->base.duplex;
	legacy_settings->port
		= link_ksettings->base.port;
	legacy_settings->phy_address
		= link_ksettings->base.phy_address;
	legacy_settings->autoneg
		= link_ksettings->base.autoneg;
	legacy_settings->mdio_support
		= link_ksettings->base.mdio_support;
	legacy_settings->eth_tp_mdix
		= link_ksettings->base.eth_tp_mdix;
	legacy_settings->eth_tp_mdix_ctrl
		= link_ksettings->base.eth_tp_mdix_ctrl;
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	legacy_settings->transceiver
		= link_ksettings->base.transceiver;
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	return retval;
}

/* number of 32-bit words to store the user's link mode bitmaps */
#define __ETHTOOL_LINK_MODE_MASK_NU32			\
	DIV_ROUND_UP(__ETHTOOL_LINK_MODE_MASK_NBITS, 32)

/* layout of the struct passed from/to userland */
struct ethtool_link_usettings {
	struct ethtool_link_settings base;
	struct {
		__u32 supported[__ETHTOOL_LINK_MODE_MASK_NU32];
		__u32 advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
		__u32 lp_advertising[__ETHTOOL_LINK_MODE_MASK_NU32];
	} link_modes;
};

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/* Internal kernel helper to query a device ethtool_link_settings. */
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int __ethtool_get_link_ksettings(struct net_device *dev,
				 struct ethtool_link_ksettings *link_ksettings)
{
	ASSERT_RTNL();

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

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	memset(link_ksettings, 0, sizeof(*link_ksettings));
	return dev->ethtool_ops->get_link_ksettings(dev, link_ksettings);
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}
EXPORT_SYMBOL(__ethtool_get_link_ksettings);

/* convert ethtool_link_usettings in user space to a kernel internal
 * ethtool_link_ksettings. return 0 on success, errno on error.
 */
static int load_link_ksettings_from_user(struct ethtool_link_ksettings *to,
					 const void __user *from)
{
	struct ethtool_link_usettings link_usettings;

	if (copy_from_user(&link_usettings, from, sizeof(link_usettings)))
		return -EFAULT;

	memcpy(&to->base, &link_usettings.base, sizeof(to->base));
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	bitmap_from_arr32(to->link_modes.supported,
			  link_usettings.link_modes.supported,
			  __ETHTOOL_LINK_MODE_MASK_NBITS);
	bitmap_from_arr32(to->link_modes.advertising,
			  link_usettings.link_modes.advertising,
			  __ETHTOOL_LINK_MODE_MASK_NBITS);
	bitmap_from_arr32(to->link_modes.lp_advertising,
			  link_usettings.link_modes.lp_advertising,
			  __ETHTOOL_LINK_MODE_MASK_NBITS);
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	return 0;
}

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/* Check if the user is trying to change anything besides speed/duplex */
bool ethtool_virtdev_validate_cmd(const struct ethtool_link_ksettings *cmd)
{
	struct ethtool_link_settings base2 = {};

	base2.speed = cmd->base.speed;
	base2.port = PORT_OTHER;
	base2.duplex = cmd->base.duplex;
	base2.cmd = cmd->base.cmd;
	base2.link_mode_masks_nwords = cmd->base.link_mode_masks_nwords;

	return !memcmp(&base2, &cmd->base, sizeof(base2)) &&
		bitmap_empty(cmd->link_modes.supported,
			     __ETHTOOL_LINK_MODE_MASK_NBITS) &&
		bitmap_empty(cmd->link_modes.lp_advertising,
			     __ETHTOOL_LINK_MODE_MASK_NBITS);
}

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/* convert a kernel internal ethtool_link_ksettings to
 * ethtool_link_usettings in user space. return 0 on success, errno on
 * error.
 */
static int
store_link_ksettings_for_user(void __user *to,
			      const struct ethtool_link_ksettings *from)
{
	struct ethtool_link_usettings link_usettings;

	memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
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	bitmap_to_arr32(link_usettings.link_modes.supported,
			from->link_modes.supported,
			__ETHTOOL_LINK_MODE_MASK_NBITS);
	bitmap_to_arr32(link_usettings.link_modes.advertising,
			from->link_modes.advertising,
			__ETHTOOL_LINK_MODE_MASK_NBITS);
	bitmap_to_arr32(link_usettings.link_modes.lp_advertising,
			from->link_modes.lp_advertising,
			__ETHTOOL_LINK_MODE_MASK_NBITS);
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	if (copy_to_user(to, &link_usettings, sizeof(link_usettings)))
		return -EFAULT;

	return 0;
}

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/* Query device for its ethtool_link_settings. */
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static int ethtool_get_link_ksettings(struct net_device *dev,
				      void __user *useraddr)
{
	int err = 0;
	struct ethtool_link_ksettings link_ksettings;

	ASSERT_RTNL();
	if (!dev->ethtool_ops->get_link_ksettings)
		return -EOPNOTSUPP;

	/* handle bitmap nbits handshake */
	if (copy_from_user(&link_ksettings.base, useraddr,
			   sizeof(link_ksettings.base)))
		return -EFAULT;

	if (__ETHTOOL_LINK_MODE_MASK_NU32
	    != link_ksettings.base.link_mode_masks_nwords) {
		/* wrong link mode nbits requested */
		memset(&link_ksettings, 0, sizeof(link_ksettings));
		link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
		/* send back number of words required as negative val */
		compiletime_assert(__ETHTOOL_LINK_MODE_MASK_NU32 <= S8_MAX,
				   "need too many bits for link modes!");
		link_ksettings.base.link_mode_masks_nwords
			= -((s8)__ETHTOOL_LINK_MODE_MASK_NU32);

		/* copy the base fields back to user, not the link
		 * mode bitmaps
		 */
		if (copy_to_user(useraddr, &link_ksettings.base,
				 sizeof(link_ksettings.base)))
			return -EFAULT;

		return 0;
	}

	/* handshake successful: user/kernel agree on
	 * link_mode_masks_nwords
	 */

	memset(&link_ksettings, 0, sizeof(link_ksettings));
	err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
	if (err < 0)
		return err;

	/* make sure we tell the right values to user */
	link_ksettings.base.cmd = ETHTOOL_GLINKSETTINGS;
	link_ksettings.base.link_mode_masks_nwords
		= __ETHTOOL_LINK_MODE_MASK_NU32;

	return store_link_ksettings_for_user(useraddr, &link_ksettings);
}

560
/* Update device ethtool_link_settings. */
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static int ethtool_set_link_ksettings(struct net_device *dev,
				      void __user *useraddr)
{
	int err;
	struct ethtool_link_ksettings link_ksettings;

	ASSERT_RTNL();

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

	/* make sure nbits field has expected value */
	if (copy_from_user(&link_ksettings.base, useraddr,
			   sizeof(link_ksettings.base)))
		return -EFAULT;

	if (__ETHTOOL_LINK_MODE_MASK_NU32
	    != link_ksettings.base.link_mode_masks_nwords)
		return -EINVAL;

	/* copy the whole structure, now that we know it has expected
	 * format
	 */
	err = load_link_ksettings_from_user(&link_ksettings, useraddr);
	if (err)
		return err;

	/* re-check nwords field, just in case */
	if (__ETHTOOL_LINK_MODE_MASK_NU32
	    != link_ksettings.base.link_mode_masks_nwords)
		return -EINVAL;

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	err = dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
	if (err >= 0) {
		ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL);
		ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
	}
	return err;
}

int ethtool_virtdev_set_link_ksettings(struct net_device *dev,
				       const struct ethtool_link_ksettings *cmd,
				       u32 *dev_speed, u8 *dev_duplex)
{
	u32 speed;
	u8 duplex;

	speed = cmd->base.speed;
	duplex = cmd->base.duplex;
	/* don't allow custom speed and duplex */
	if (!ethtool_validate_speed(speed) ||
	    !ethtool_validate_duplex(duplex) ||
	    !ethtool_virtdev_validate_cmd(cmd))
		return -EINVAL;
	*dev_speed = speed;
	*dev_duplex = duplex;

	return 0;
619
}
620
EXPORT_SYMBOL(ethtool_virtdev_set_link_ksettings);
621
622
623

/* Query device for its ethtool_cmd settings.
 *
624
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628
629
 * Backward compatibility note: for compatibility with legacy ethtool, this is
 * now implemented via get_link_ksettings. When driver reports higher link mode
 * bits, a kernel warning is logged once (with name of 1st driver/device) to
 * recommend user to upgrade ethtool, but the command is successful (only the
 * lower link mode bits reported back to user). Deprecated fields from
 * ethtool_cmd (transceiver/maxrxpkt/maxtxpkt) are always set to zero.
630
631
632
 */
static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
{
633
	struct ethtool_link_ksettings link_ksettings;
634
	struct ethtool_cmd cmd;
635
	int err;
636
637

	ASSERT_RTNL();
638
639
	if (!dev->ethtool_ops->get_link_ksettings)
		return -EOPNOTSUPP;
640

641
642
643
644
645
	memset(&link_ksettings, 0, sizeof(link_ksettings));
	err = dev->ethtool_ops->get_link_ksettings(dev, &link_ksettings);
	if (err < 0)
		return err;
	convert_link_ksettings_to_legacy_settings(&cmd, &link_ksettings);
646

647
648
	/* send a sensible cmd tag back to user */
	cmd.cmd = ETHTOOL_GSET;
649
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653
654
655
656
657

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

	return 0;
}

/* Update device link settings with given ethtool_cmd.
 *
658
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662
 * Backward compatibility note: for compatibility with legacy ethtool, this is
 * now always implemented via set_link_settings. When user's request updates
 * deprecated ethtool_cmd fields (transceiver/maxrxpkt/maxtxpkt), a kernel
 * warning is logged once (with name of 1st driver/device) to recommend user to
 * upgrade ethtool, and the request is rejected.
663
664
665
 */
static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
{
666
	struct ethtool_link_ksettings link_ksettings;
667
	struct ethtool_cmd cmd;
668
	int ret;
669
670
671
672
673

	ASSERT_RTNL();

	if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
		return -EFAULT;
674
	if (!dev->ethtool_ops->set_link_ksettings)
675
676
		return -EOPNOTSUPP;

677
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679
680
	if (!convert_legacy_settings_to_link_ksettings(&link_ksettings, &cmd))
		return -EINVAL;
	link_ksettings.base.link_mode_masks_nwords =
		__ETHTOOL_LINK_MODE_MASK_NU32;
681
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686
	ret = dev->ethtool_ops->set_link_ksettings(dev, &link_ksettings);
	if (ret >= 0) {
		ethtool_notify(dev, ETHTOOL_MSG_LINKINFO_NTF, NULL);
		ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
	}
	return ret;
687
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691
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693
694
695
696
}

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;

	memset(&info, 0, sizeof(info));
	info.cmd = ETHTOOL_GDRVINFO;
697
	strlcpy(info.version, UTS_RELEASE, sizeof(info.version));
698
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	if (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;
	}

	/*
	 * 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;
	}
726
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731
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	if (ops->get_regs_len) {
		int ret = ops->get_regs_len(dev);

		if (ret > 0)
			info.regdump_len = ret;
	}

733
734
735
	if (ops->get_eeprom_len)
		info.eedump_len = ops->get_eeprom_len(dev);

736
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738
739
	if (!info.fw_version[0])
		devlink_compat_running_version(dev, info.fw_version,
					       sizeof(info.fw_version));

740
741
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	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;
	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 */
	n_bits = hweight64(sset_mask);

	memset(&info, 0, sizeof(info));
	info.cmd = ETHTOOL_GSSET_INFO;

767
	info_buf = kcalloc(n_bits, sizeof(u32), GFP_USER);
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838
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842
843
844
845
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847
848
849
850
851
852
853
854
855
	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;

		rc = __ethtool_get_sset_count(dev, i);
		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;
}

static noinline_for_stack int ethtool_set_rxnfc(struct net_device *dev,
						u32 cmd, void __user *useraddr)
{
	struct ethtool_rxnfc info;
	size_t info_size = sizeof(info);
	int rc;

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

	/* 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))
		return -EFAULT;

	rc = dev->ethtool_ops->set_rxnfc(dev, &info);
	if (rc)
		return rc;

	if (cmd == ETHTOOL_SRXCLSRLINS &&
	    copy_to_user(useraddr, &info, info_size))
		return -EFAULT;

	return 0;
}

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

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

	/* 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))
		return -EFAULT;

856
857
858
859
860
861
862
863
864
865
866
867
868
869
	/* If FLOW_RSS was requested then user-space must be using the
	 * new definition, as FLOW_RSS is newer.
	 */
	if (cmd == ETHTOOL_GRXFH && info.flow_type & FLOW_RSS) {
		info_size = sizeof(info);
		if (copy_from_user(&info, useraddr, info_size))
			return -EFAULT;
		/* Since malicious users may modify the original data,
		 * we need to check whether FLOW_RSS is still requested.
		 */
		if (!(info.flow_type & FLOW_RSS))
			return -EINVAL;
	}

870
871
872
	if (info.cmd != cmd)
		return -EINVAL;

873
874
875
	if (info.cmd == ETHTOOL_GRXCLSRLALL) {
		if (info.rule_cnt > 0) {
			if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
876
				rule_buf = kcalloc(info.rule_cnt, sizeof(u32),
877
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880
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883
884
885
886
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941
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955
956
957
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960
961
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963
964
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966
967
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969
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971
972
973
974
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978
979
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981
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1003
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1009
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1020
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1022
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1025
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1038
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1064
1065
1066
1067
1068
1069
1070
						   GFP_USER);
			if (!rule_buf)
				return -ENOMEM;
		}
	}

	ret = ops->get_rxnfc(dev, &info, rule_buf);
	if (ret < 0)
		goto err_out;

	ret = -EFAULT;
	if (copy_to_user(useraddr, &info, info_size))
		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:
	kfree(rule_buf);

	return ret;
}

static int ethtool_copy_validate_indir(u32 *indir, void __user *useraddr,
					struct ethtool_rxnfc *rx_rings,
					u32 size)
{
	int i;

	if (copy_from_user(indir, useraddr, size * sizeof(indir[0])))
		return -EFAULT;

	/* Validate ring indices */
	for (i = 0; i < size; i++)
		if (indir[i] >= rx_rings->data)
			return -EINVAL;

	return 0;
}

u8 netdev_rss_key[NETDEV_RSS_KEY_LEN] __read_mostly;

void netdev_rss_key_fill(void *buffer, size_t len)
{
	BUG_ON(len > sizeof(netdev_rss_key));
	net_get_random_once(netdev_rss_key, sizeof(netdev_rss_key));
	memcpy(buffer, netdev_rss_key, len);
}
EXPORT_SYMBOL(netdev_rss_key_fill);

static noinline_for_stack int ethtool_get_rxfh_indir(struct net_device *dev,
						     void __user *useraddr)
{
	u32 user_size, dev_size;
	u32 *indir;
	int ret;

	if (!dev->ethtool_ops->get_rxfh_indir_size ||
	    !dev->ethtool_ops->get_rxfh)
		return -EOPNOTSUPP;
	dev_size = dev->ethtool_ops->get_rxfh_indir_size(dev);
	if (dev_size == 0)
		return -EOPNOTSUPP;

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

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

	/* If the user buffer size is 0, this is just a query for the
	 * device table size.  Otherwise, if it's smaller than the
	 * device table size it's an error.
	 */
	if (user_size < dev_size)
		return user_size == 0 ? 0 : -EINVAL;

	indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
	if (!indir)
		return -ENOMEM;

	ret = dev->ethtool_ops->get_rxfh(dev, indir, NULL, NULL);
	if (ret)
		goto out;

	if (copy_to_user(useraddr +
			 offsetof(struct ethtool_rxfh_indir, ring_index[0]),
			 indir, dev_size * sizeof(indir[0])))
		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_rxnfc rx_rings;
	u32 user_size, dev_size, i;
	u32 *indir;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	int ret;
	u32 ringidx_offset = offsetof(struct ethtool_rxfh_indir, ring_index[0]);

	if (!ops->get_rxfh_indir_size || !ops->set_rxfh ||
	    !ops->get_rxnfc)
		return -EOPNOTSUPP;

	dev_size = ops->get_rxfh_indir_size(dev);
	if (dev_size == 0)
		return -EOPNOTSUPP;

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

	if (user_size != 0 && user_size != dev_size)
		return -EINVAL;

	indir = kcalloc(dev_size, sizeof(indir[0]), GFP_USER);
	if (!indir)
		return -ENOMEM;

	rx_rings.cmd = ETHTOOL_GRXRINGS;
	ret = ops->get_rxnfc(dev, &rx_rings, NULL);
	if (ret)
		goto out;

	if (user_size == 0) {
		for (i = 0; i < dev_size; i++)
			indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
	} else {
		ret = ethtool_copy_validate_indir(indir,
						  useraddr + ringidx_offset,
						  &rx_rings,
						  dev_size);
		if (ret)
			goto out;
	}

	ret = ops->set_rxfh(dev, indir, NULL, ETH_RSS_HASH_NO_CHANGE);
	if (ret)
		goto out;

	/* indicate whether rxfh was set to default */
	if (user_size == 0)
		dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
	else
		dev->priv_flags |= IFF_RXFH_CONFIGURED;

out:
	kfree(indir);
	return ret;
}

static noinline_for_stack int ethtool_get_rxfh(struct net_device *dev,
					       void __user *useraddr)
{
	int ret;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	u32 user_indir_size, user_key_size;
	u32 dev_indir_size = 0, dev_key_size = 0;
	struct ethtool_rxfh rxfh;
	u32 total_size;
	u32 indir_bytes;
	u32 *indir = NULL;
	u8 dev_hfunc = 0;
	u8 *hkey = NULL;
	u8 *rss_config;

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

	if (ops->get_rxfh_indir_size)
		dev_indir_size = ops->get_rxfh_indir_size(dev);
	if (ops->get_rxfh_key_size)
		dev_key_size = ops->get_rxfh_key_size(dev);

	if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
		return -EFAULT;
	user_indir_size = rxfh.indir_size;
	user_key_size = rxfh.key_size;

	/* Check that reserved fields are 0 for now */
1071
	if (rxfh.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
1072
		return -EINVAL;
1073
1074
1075
	/* Most drivers don't handle rss_context, check it's 0 as well */
	if (rxfh.rss_context && !ops->get_rxfh_context)
		return -EOPNOTSUPP;
1076
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	rxfh.indir_size = dev_indir_size;
	rxfh.key_size = dev_key_size;
	if (copy_to_user(useraddr, &rxfh, sizeof(rxfh)))
		return -EFAULT;

	if ((user_indir_size && (user_indir_size != dev_indir_size)) ||
	    (user_key_size && (user_key_size != dev_key_size)))
		return -EINVAL;

	indir_bytes = user_indir_size * sizeof(indir[0]);
	total_size = indir_bytes + user_key_size;
	rss_config = kzalloc(total_size, GFP_USER);
	if (!rss_config)
		return -ENOMEM;

	if (user_indir_size)
		indir = (u32 *)rss_config;

	if (user_key_size)
		hkey = rss_config + indir_bytes;

1098
1099
1100
1101
1102
1103
	if (rxfh.rss_context)
		ret = dev->ethtool_ops->get_rxfh_context(dev, indir, hkey,
							 &dev_hfunc,
							 rxfh.rss_context);
	else
		ret = dev->ethtool_ops->get_rxfh(dev, indir, hkey, &dev_hfunc);
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
	if (ret)
		goto out;

	if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, hfunc),
			 &dev_hfunc, sizeof(rxfh.hfunc))) {
		ret = -EFAULT;
	} else if (copy_to_user(useraddr +
			      offsetof(struct ethtool_rxfh, rss_config[0]),
			      rss_config, total_size)) {
		ret = -EFAULT;
	}
out:
	kfree(rss_config);

	return ret;
}

static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
					       void __user *useraddr)
{
	int ret;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	struct ethtool_rxnfc rx_rings;
	struct ethtool_rxfh rxfh;
	u32 dev_indir_size = 0, dev_key_size = 0, i;
	u32 *indir = NULL, indir_bytes = 0;
	u8 *hkey = NULL;
	u8 *rss_config;
	u32 rss_cfg_offset = offsetof(struct ethtool_rxfh, rss_config[0]);
1133
	bool delete = false;
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146

	if (!ops->get_rxnfc || !ops->set_rxfh)
		return -EOPNOTSUPP;

	if (ops->get_rxfh_indir_size)
		dev_indir_size = ops->get_rxfh_indir_size(dev);
	if (ops->get_rxfh_key_size)
		dev_key_size = ops->get_rxfh_key_size(dev);

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

	/* Check that reserved fields are 0 for now */
1147
	if (rxfh.rsvd8[0] || rxfh.rsvd8[1] || rxfh.rsvd8[2] || rxfh.rsvd32)
1148
		return -EINVAL;
1149
1150
1151
	/* Most drivers don't handle rss_context, check it's 0 as well */
	if (rxfh.rss_context && !ops->set_rxfh_context)
		return -EOPNOTSUPP;
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175

	/* If either indir, hash key or function is valid, proceed further.
	 * Must request at least one change: indir size, hash key or function.
	 */
	if ((rxfh.indir_size &&
	     rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
	     rxfh.indir_size != dev_indir_size) ||
	    (rxfh.key_size && (rxfh.key_size != dev_key_size)) ||
	    (rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
	     rxfh.key_size == 0 && rxfh.hfunc == ETH_RSS_HASH_NO_CHANGE))
		return -EINVAL;

	if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
		indir_bytes = dev_indir_size * sizeof(indir[0]);

	rss_config = kzalloc(indir_bytes + rxfh.key_size, GFP_USER);
	if (!rss_config)
		return -ENOMEM;

	rx_rings.cmd = ETHTOOL_GRXRINGS;
	ret = ops->get_rxnfc(dev, &rx_rings, NULL);
	if (ret)
		goto out;

1176
1177
	/* rxfh.indir_size == 0 means reset the indir table to default (master
	 * context) or delete the context (other RSS contexts).
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
	 * rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE means leave it unchanged.
	 */
	if (rxfh.indir_size &&
	    rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE) {
		indir = (u32 *)rss_config;
		ret = ethtool_copy_validate_indir(indir,
						  useraddr + rss_cfg_offset,
						  &rx_rings,
						  rxfh.indir_size);
		if (ret)
			goto out;
	} else if (rxfh.indir_size == 0) {
1190
1191
1192
1193
1194
1195
1196
		if (rxfh.rss_context == 0) {
			indir = (u32 *)rss_config;
			for (i = 0; i < dev_indir_size; i++)
				indir[i] = ethtool_rxfh_indir_default(i, rx_rings.data);
		} else {
			delete = true;
		}
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
	}

	if (rxfh.key_size) {
		hkey = rss_config + indir_bytes;
		if (copy_from_user(hkey,
				   useraddr + rss_cfg_offset + indir_bytes,
				   rxfh.key_size)) {
			ret = -EFAULT;
			goto out;
		}
	}

1209
1210
1211
1212
1213
	if (rxfh.rss_context)
		ret = ops->set_rxfh_context(dev, indir, hkey, rxfh.hfunc,
					    &rxfh.rss_context, delete);
	else
		ret = ops->set_rxfh(dev, indir, hkey, rxfh.hfunc);
1214
1215
1216
	if (ret)
		goto out;

1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
	if (copy_to_user(useraddr + offsetof(struct ethtool_rxfh, rss_context),
			 &rxfh.rss_context, sizeof(rxfh.rss_context)))
		ret = -EFAULT;

	if (!rxfh.rss_context) {
		/* indicate whether rxfh was set to default */
		if (rxfh.indir_size == 0)
			dev->priv_flags &= ~IFF_RXFH_CONFIGURED;
		else if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
			dev->priv_flags |= IFF_RXFH_CONFIGURED;
	}
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247

out:
	kfree(rss_config);
	return ret;
}

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);
1248
1249
1250
	if (reglen <= 0)
		return reglen;

1251
1252
1253
	if (regs.len > reglen)
		regs.len = reglen;

1254
1255
1256
	regbuf = vzalloc(reglen);
	if (!regbuf)
		return -ENOMEM;
1257

1258
1259
1260
	if (regs.len < reglen)
		reglen = regs.len;

1261
1262
1263
1264
1265
1266
	ops->get_regs(dev, &regs, regbuf);

	ret = -EFAULT;
	if (copy_to_user(useraddr, &regs, sizeof(regs)))
		goto out;
	useraddr += offsetof(struct ethtool_regs, data);
1267
	if (copy_to_user(useraddr, regbuf, reglen))
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
		goto out;
	ret = 0;

 out:
	vfree(regbuf);
	return ret;
}

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;
}

static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
{
1298
	struct ethtool_wolinfo wol;
1299
1300
1301
1302

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

1303
1304
	memset(&wol, 0, sizeof(struct ethtool_wolinfo));
	wol.cmd = ETHTOOL_GWOL;
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
	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;
1315
	int ret;
1316
1317
1318
1319
1320
1321
1322

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

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

1323
1324
1325
1326
1327
	ret = dev->ethtool_ops->set_wol(dev, &wol);
	if (ret)
		return ret;

	dev->wol_enabled = !!wol.wolopts;
1328
	ethtool_notify(dev, ETHTOOL_MSG_WOL_NTF, NULL);
1329
1330

	return 0;
1331
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1342
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1344
1345
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1347
1348
1349
1350
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1352
1353
1354
1355
1356
}

static int ethtool_get_eee(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_eee edata;
	int rc;

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

	memset(&edata, 0, sizeof(struct ethtool_eee));
	edata.cmd = ETHTOOL_GEEE;
	rc = dev->ethtool_ops->get_eee(dev, &edata);

	if (rc)
		return rc;

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

	return 0;
}

static int ethtool_set_eee(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_eee edata;
1357
	int ret;
1358
1359
1360
1361
1362
1363
1364

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

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

1365
1366
1367
1368
	ret = dev->ethtool_ops->set_eee(dev, &edata);
	if (!ret)
		ethtool_notify(dev, ETHTOOL_MSG_EEE_NTF, NULL);
	return ret;
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
}

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_link(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
1382
	int link = __ethtool_get_link(dev);
1383

1384
1385
	if (link < 0)
		return link;
1386

1387
	edata.data = link;
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
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1457
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1461
1462
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1467
1468
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1470
1471
1472
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1475
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1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
	if (copy_to_user(useraddr, &edata, sizeof(edata)))
		return -EFAULT;
	return 0;
}

static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
				  int (*getter)(struct net_device *,
						struct ethtool_eeprom *, u8 *),
				  u32 total_len)
{
	struct ethtool_eeprom eeprom;
	void __user *userbuf = useraddr + sizeof(eeprom);
	u32 bytes_remaining;
	u8 *data;
	int ret = 0;

	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 > total_len)
		return -EINVAL;

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

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

		ret = getter(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;
	}

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

	kfree(data);
	return ret;
}

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

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

	return ethtool_get_any_eeprom(dev, useraddr, ops->get_eeprom,
				      ops->get_eeprom_len(dev));
}

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

	if (!ops->set_eeprom || !ops->get_eeprom_len ||
	    !ops->get_eeprom_len(dev))
		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(PAGE_SIZE, GFP_USER);
	if (!data)
		return -ENOMEM;

	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;
	}

	kfree(data);
	return ret;
}

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

1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
static bool
ethtool_set_coalesce_supported(struct net_device *dev,
			       struct ethtool_coalesce *coalesce)
{
	u32 supported_params = dev->ethtool_ops->supported_coalesce_params;
	u32 nonzero_params = 0;

	if (coalesce->rx_coalesce_usecs)
		nonzero_params |= ETHTOOL_COALESCE_RX_USECS;
	if (coalesce->rx_max_coalesced_frames)
		nonzero_params |= ETHTOOL_COALESCE_RX_MAX_FRAMES;
	if (coalesce->rx_coalesce_usecs_irq)
		nonzero_params |= ETHTOOL_COALESCE_RX_USECS_IRQ;
	if (coalesce->rx_max_coalesced_frames_irq)
		nonzero_params |= ETHTOOL_COALESCE_RX_MAX_FRAMES_IRQ;
	if (coalesce->tx_coalesce_usecs)
		nonzero_params |= ETHTOOL_COALESCE_TX_USECS;
	if (coalesce->tx_max_coalesced_frames)
		nonzero_params |= ETHTOOL_COALESCE_TX_MAX_FRAMES;
	if (coalesce->tx_coalesce_usecs_irq)
		nonzero_params |= ETHTOOL_COALESCE_TX_USECS_IRQ;
	if (coalesce->tx_max_coalesced_frames_irq)
		nonzero_params |= ETHTOOL_COALESCE_TX_MAX_FRAMES_IRQ;
	if (coalesce->stats_block_coalesce_usecs)
		nonzero_params |= ETHTOOL_COALESCE_STATS_BLOCK_USECS;
	if (coalesce->use_adaptive_rx_coalesce)
		nonzero_params |= ETHTOOL_COALESCE_USE_ADAPTIVE_RX;
	if (coalesce->use_adaptive_tx_coalesce)
		nonzero_params |= ETHTOOL_COALESCE_USE_ADAPTIVE_TX;
	if (coalesce->pkt_rate_low)
		nonzero_params |= ETHTOOL_COALESCE_PKT_RATE_LOW;
	if (coalesce->rx_coalesce_usecs_low)
		nonzero_params |= ETHTOOL_COALESCE_RX_USECS_LOW;
	if (coalesce->rx_max_coalesced_frames_low)
		nonzero_params |= ETHTOOL_COALESCE_RX_MAX_FRAMES_LOW;
	if (coalesce->tx_coalesce_usecs_low)
		nonzero_params |= ETHTOOL_COALESCE_TX_USECS_LOW;
	if (coalesce->tx_max_coalesced_frames_low)
		nonzero_params |= ETHTOOL_COALESCE_TX_MAX_FRAMES_LOW;
	if (coalesce->pkt_rate_high)
		nonzero_params |= ETHTOOL_COALESCE_PKT_RATE_HIGH;
	if (coalesce->rx_coalesce_usecs_high)
		nonzero_params |= ETHTOOL_COALESCE_RX_USECS_HIGH;
	if (coalesce->rx_max_coalesced_frames_high)
		nonzero_params |= ETHTOOL_COALESCE_RX_MAX_FRAMES_HIGH;
	if (coalesce->tx_coalesce_usecs_high)
		nonzero_params |= ETHTOOL_COALESCE_TX_USECS_HIGH;
	if (coalesce->tx_max_coalesced_frames_high)
		nonzero_params |= ETHTOOL_COALESCE_TX_MAX_FRAMES_HIGH;
	if (coalesce->rate_sample_interval)
		nonzero_params |= ETHTOOL_COALESCE_RATE_SAMPLE_INTERVAL;

	return (supported_params & nonzero_params) == nonzero_params;
}

1574
1575
1576
1577
static noinline_for_stack int ethtool_set_coalesce(struct net_device *dev,
						   void __user *useraddr)
{
	struct ethtool_coalesce coalesce;
1578
	int ret;
1579
1580
1581
1582
1583
1584
1585

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

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

1586
1587
1588
1589
1590
1591
1592
	if (!ethtool_set_coalesce_supported(dev, &coalesce))
		return -EOPNOTSUPP;

	ret = dev->ethtool_ops->set_coalesce(dev, &coalesce);
	if (!ret)
		ethtool_notify(dev, ETHTOOL_MSG_COALESCE_NTF, NULL);
	return ret;
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
}

static int ethtool_get_ringparam(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_ringparam ringparam = { .cmd = 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)
{
1611
	struct ethtool_ringparam ringparam, max = { .cmd = ETHTOOL_GRINGPARAM };
1612
	int ret;
1613

1614
	if (!dev->ethtool_ops->set_ringparam || !dev->ethtool_ops->get_ringparam)
1615
1616
1617
1618
1619
		return -EOPNOTSUPP;

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

1620
1621
1622
1623
1624
1625
1626
1627
1628
	dev->ethtool_ops->get_ringparam(dev, &max);

	/* ensure new ring parameters are within the maximums */
	if (ringparam.rx_pending > max.rx_max_pending ||
	    ringparam.rx_mini_pending > max.rx_mini_max_pending ||
	    ringparam.rx_jumbo_pending > max.rx_jumbo_max_pending ||
	    ringparam.tx_pending > max.tx_max_pending)
		return -EINVAL;

1629
1630
1631
1632
	ret = dev->ethtool_ops->set_ringparam(dev, &ringparam);
	if (!ret)
		ethtool_notify(dev, ETHTOOL_MSG_RINGS_NTF, NULL);
	return ret;
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
}

static noinline_for_stack int ethtool_get_channels(struct net_device *dev,
						   void __user *useraddr)
{
	struct ethtool_channels channels = { .cmd = ETHTOOL_GCHANNELS };

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

	dev->ethtool_ops->get_channels(dev, &channels);

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

static noinline_for_stack int ethtool_set_channels(struct net_device *dev,
						   void __user *useraddr)
{
1653
1654
	struct ethtool_channels channels, curr = { .cmd = ETHTOOL_GCHANNELS };
	u16 from_channel, to_channel;
1655
	u32 max_rx_in_use = 0;
1656
	unsigned int i;
1657
	int ret;
1658
1659
1660
1661
1662
1663
1664

	if (!dev->ethtool_ops->set_channels || !dev->ethtool_ops->get_channels)
		return -EOPNOTSUPP;

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

1665
	dev->ethtool_ops->get_channels(dev, &curr);
1666
1667

	/* ensure new counts are within the maximums */
1668
1669
1670
1671
	if (channels.rx_count > curr.max_rx ||
	    channels.tx_count > curr.max_tx ||
	    channels.combined_count > curr.max_combined ||
	    channels.other_count > curr.max_other)
1672
1673
1674
1675
1676
1677
1678
1679
1680
		return -EINVAL;

	/* ensure the new Rx count fits within the configured Rx flow
	 * indirection table settings */
	if (netif_is_rxfh_configured(dev) &&
	    !ethtool_get_max_rxfh_channel(dev, &max_rx_in_use) &&
	    (channels.combined_count + channels.rx_count) <= max_rx_in_use)
	    return -EINVAL;

1681
1682
1683
1684
1685
1686
1687
1688
	/* Disabling channels, query zero-copy AF_XDP sockets */
	from_channel = channels.combined_count +
		min(channels.rx_count, channels.tx_count);
	to_channel = curr.combined_count + max(curr.rx_count, curr.tx_count);
	for (i = from_channel; i < to_channel; i++)
		if (xdp_get_umem_from_qid(dev, i))
			return -EINVAL;

1689
1690
1691
1692
	ret = dev->ethtool_ops->set_channels(dev, &channels);
	if (!ret)
		ethtool_notify(dev, ETHTOOL_MSG_CHANNELS_NTF, NULL);
	return ret;
1693
1694
1695
1696
}

static int ethtool_get_pauseparam(struct net_device *dev, void __user *useraddr)
{
1697
	struct ethtool_pauseparam pauseparam = { .cmd = ETHTOOL_GPAUSEPARAM };
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711

	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;
1712
	int ret;
1713
1714
1715
1716
1717
1718
1719

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

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

1720
1721
1722
1723
	ret = dev->ethtool_ops->set_pauseparam(dev, &pauseparam);
	if (!ret)
		ethtool_notify(dev, ETHTOOL_MSG_PAUSE_NTF, NULL);
	return ret;
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
}

static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
{
	struct ethtool_test test;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	u64 *data;
	int ret, test_len;

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

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

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

	test.len = test_len;
1745
	data = kmalloc_array(test_len, sizeof(u64), GFP_USER);
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
	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;

	ret = __ethtool_get_sset_count(dev, gstrings.string_set);
	if (ret < 0)
		return ret;
1776
1777
1778
	if (ret > S32_MAX / ETH_GSTRING_LEN)
		return -ENOMEM;
	WARN_ON_ONCE(!ret);
1779
1780
1781

	gstrings.len = ret;

1782
1783
1784
1785
1786
1787
1788
1789
1790
	if (gstrings.len) {
		data = vzalloc(array_size(gstrings.len, ETH_GSTRING_LEN));
		if (!data)
			return -ENOMEM;

		__ethtool_get_strings(dev, gstrings.string_set, data);
	} else {
		data = NULL;
	}
1791
1792
1793
1794
1795

	ret = -EFAULT;
	if (copy_to_user(useraddr, &gstrings, sizeof(gstrings)))
		goto out;
	useraddr += sizeof(gstrings);
1796
1797
	if (gstrings.len &&
	    copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
1798
1799
1800
1801
		goto out;
	ret = 0;

out:
1802
	vfree(data);
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
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1817
1818
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1824
1825
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1853
1854
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1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
	return ret;
}

static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_value id;
	static bool busy;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	int rc;

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

	if (busy)
		return -EBUSY;

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

	rc = ops->set_phys_id(dev, ETHTOOL_ID_ACTIVE);
	if (rc < 0)
		return rc;

	/* Drop the RTNL lock while waiting, but prevent reentry or
	 * removal of the device.
	 */
	busy = true;
	dev_hold(dev);
	rtnl_unlock();

	if (rc == 0) {
		/* Driver will handle this itself */
		schedule_timeout_interruptible(
			id.data ? (id.data * HZ) : MAX_SCHEDULE_TIMEOUT);
	} else {
		/* Driver expects to be called at twice the frequency in rc */
		int n = rc * 2, i, interval = HZ / n;

		/* Count down seconds */
		do {
			/* Count down iterations per second */
			i = n;
			do {
				rtnl_lock();
				rc = ops->set_phys_id(dev,
				    (i & 1) ? ETHTOOL_ID_OFF : ETHTOOL_ID_ON);
				rtnl_unlock();
				if (rc)
					break;
				schedule_timeout_interruptible(interval);
			} while (!signal_pending(current) && --i != 0);
		} while (!signal_pending(current) &&
			 (id.data == 0 || --id.data != 0));
	}

	rtnl_lock();
	dev_put(dev);
	busy = false;

	(void) ops->set_phys_id(dev, ETHTOOL_ID_INACTIVE);
	return rc;
}

static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_stats stats;
	const struct ethtool_ops *ops = dev->ethtool_ops;
	u64 *data;
	int ret, n_stats;

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

	n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
	if (n_stats < 0)
		return n_stats;
1879
1880
1881
	if (n_stats > S32_MAX / sizeof(u64))
		return -ENOMEM;
	WARN_ON_ONCE(!n_stats);
1882
1883
1884
1885
1886
	if (copy_from_user(&stats, useraddr, sizeof(stats)))
		return -EFAULT;

	stats.n_stats = n_stats;

1887
1888
1889
1890
1891
1892
1893
1894
	if (n_stats) {
		data = vzalloc(array_size(n_stats, sizeof(u64)));
		if (!data)
			return -ENOMEM;
		ops->get_ethtool_stats(dev, &stats, data);
	} else {
		data = NULL;
	}
1895
1896
1897
1898
1899

	ret = -EFAULT;
	if (copy_to_user(useraddr, &stats, sizeof(stats)))
		goto out;
	useraddr += sizeof(stats);
1900
	if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1901
1902
1903
1904
		goto out;
	ret = 0;

 out:
1905
	vfree(data);
1906
1907
1908
1909
1910
	return ret;
}

static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
{
1911
	const struct ethtool_ops *ops = dev->ethtool_ops;
1912
	struct phy_device *phydev = dev->phydev;
1913
	struct ethtool_stats stats;
1914
1915
1916
	u64 *data;
	int ret, n_stats;

1917
	if (!phydev && (!ops->get_ethtool_phy_stats || !ops->get_sset_count))
1918
1919
		return -EOPNOTSUPP;

1920
1921
1922
1923
	if (dev->phydev && !ops->get_ethtool_phy_stats)
		n_stats = phy_ethtool_get_sset_count(dev->phydev);
	else
		n_stats = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
1924
1925
	if (n_stats < 0)
		return n_stats;
1926
1927
1928
	if (n_stats > S32_MAX / sizeof(u64))
		return -ENOMEM;
	WARN_ON_ONCE(!n_stats);
1929
1930
1931
1932
1933
1934

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

	stats.n_stats = n_stats;

1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
	if (n_stats) {
		data = vzalloc(array_size(n_stats, sizeof(u64)));
		if (!data)
			return -ENOMEM;

		if (dev->phydev && !ops->get_ethtool_phy_stats) {
			ret = phy_ethtool_get_stats(dev->phydev, &stats, data);
			if (ret < 0)
				goto out;
		} else {
			ops->get_ethtool_phy_stats(dev, &stats, data);
		}
1947
	} else {
1948
		data = NULL;
1949
	}
1950
1951
1952
1953
1954

	ret = -EFAULT;
	if (copy_to_user(useraddr, &stats, sizeof(stats)))
		goto out;
	useraddr += sizeof(stats);
1955
	if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
1956
1957
1958
1959
		goto out;
	ret = 0;

 out:
1960
	vfree(data);
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
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1998
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2000
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2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
	return ret;
}

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

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

	if (epaddr.size < dev->addr_len)
		return -ETOOSMALL;
	epaddr.size = dev->addr_len;

	if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
		return -EFAULT;
	useraddr += sizeof(epaddr);
	if (copy_to_user(useraddr, dev->perm_addr, epaddr.size))
		return -EFAULT;
	return 0;
}

static int ethtool_get_value(struct net_device *dev, char __user *useraddr,
			     u32 cmd, u32 (*actor)(struct net_device *))
{
	struct ethtool_value edata = { .cmd = cmd };

	if (!actor)
		return -EOPNOTSUPP;

	edata.data = actor(dev);

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

static int ethtool_set_value_void(struct net_device *dev, char __user *useraddr,
			     void (*actor)(struct net_device *, u32))
{
	struct ethtool_value edata;

	if (!actor)
		return -EOPNOTSUPP;

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

	actor(dev, edata.data);
	return 0;
}

static int ethtool_set_value(struct net_device *dev, char __user *useraddr,
			     int (*actor)(struct net_device *, u32))
{
	struct ethtool_value edata;

	if (!actor)
		return -EOPNOTSUPP;

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

	return actor(dev, edata.data);
}

static noinline_for_stack int ethtool_flash_device(struct net_device *dev,
						   char __user *useraddr)
{
	struct ethtool_flash efl;

	if (copy_from_user(&efl, useraddr, sizeof(efl)))
		return -EFAULT;
2034
	efl.data[ETHTOOL_FLASH_MAX_FILENAME - 1] = 0;
2035
2036

	if (!dev->ethtool_ops->flash_device)