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root/net/core/ethtool.c

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DEFINITIONS

This source file includes following definitions.
  1. ethtool_op_get_link
  2. ethtool_op_get_tx_csum
  3. ethtool_op_set_tx_csum
  4. ethtool_op_set_tx_hw_csum
  5. ethtool_op_set_tx_ipv6_csum
  6. ethtool_op_get_sg
  7. ethtool_op_set_sg
  8. ethtool_op_get_tso
  9. ethtool_op_set_tso
  10. ethtool_op_get_ufo
  11. ethtool_op_set_ufo
  12. ethtool_op_get_flags
  13. ethtool_op_set_flags
  14. ethtool_get_settings
  15. ethtool_set_settings
  16. ethtool_get_drvinfo
  17. ethtool_set_rxhash
  18. ethtool_get_rxhash
  19. ethtool_get_regs
  20. ethtool_get_wol
  21. ethtool_set_wol
  22. ethtool_nway_reset
  23. ethtool_get_eeprom
  24. ethtool_set_eeprom
  25. ethtool_get_coalesce
  26. ethtool_set_coalesce
  27. ethtool_get_ringparam
  28. ethtool_set_ringparam
  29. ethtool_get_pauseparam
  30. ethtool_set_pauseparam
  31. __ethtool_set_sg
  32. ethtool_set_tx_csum
  33. ethtool_set_sg
  34. ethtool_set_tso
  35. ethtool_set_ufo
  36. ethtool_get_gso
  37. ethtool_set_gso
  38. ethtool_self_test
  39. ethtool_get_strings
  40. ethtool_phys_id
  41. ethtool_get_stats
  42. ethtool_get_perm_addr
  43. ethtool_get_value
  44. ethtool_set_value_void
  45. ethtool_set_value
  46. dev_ethtool

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

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

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

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

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

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

        return 0;
}

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

        return 0;
}

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

        return 0;
}

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

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

        return 0;
}

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

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

        return 0;
}

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

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

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

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

        return dev->features & flags_dup_features;
}

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

        return 0;
}

/* Handlers for each ethtool command */

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

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

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

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

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

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

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

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

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

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

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

        if (ops->get_sset_count) {
                int rc;

                rc = ops->get_sset_count(dev, ETH_SS_TEST);
                if (rc >= 0)
                        info.testinfo_len = rc;
                rc = ops->get_sset_count(dev, ETH_SS_STATS);
                if (rc >= 0)
                        info.n_stats = rc;
                rc = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS);
                if (rc >= 0)
                        info.n_priv_flags = rc;
        } else {
                /* code path for obsolete hooks */

                if (ops->self_test_count)
                        info.testinfo_len = ops->self_test_count(dev);
                if (ops->get_stats_count)
                        info.n_stats = ops->get_stats_count(dev);
        }
        if (ops->get_regs_len)
                info.regdump_len = ops->get_regs_len(dev);
        if (ops->get_eeprom_len)
                info.eedump_len = ops->get_eeprom_len(dev);

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

static int ethtool_set_rxhash(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_rxnfc cmd;

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

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

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

static int ethtool_get_rxhash(struct net_device *dev, void __user *useraddr)
{
        struct ethtool_rxnfc info;

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

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

        dev->ethtool_ops->get_rxhash(dev, &info);

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

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

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

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

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

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

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

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

 out:
        kfree(regbuf);
        return ret;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        data = kmalloc(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 = 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;
        }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

        return __ethtool_set_sg(dev, edata.data);
}

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

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

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

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

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

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

        if (!dev->ethtool_ops->set_ufo)
                return -EOPNOTSUPP;
        if (copy_from_user(&edata, useraddr, sizeof(edata)))
                return -EFAULT;
        if (edata.data && !(dev->features & NETIF_F_SG))
                return -EINVAL;
        if (edata.data && !(dev->features & NETIF_F_HW_CSUM))
                return -EINVAL;
        return dev->ethtool_ops->set_ufo(dev, edata.data);
}

static int ethtool_get_gso(struct net_device *dev, char __user *useraddr)
{
        struct ethtool_value edata = { ETHTOOL_GGSO };

        edata.data = dev->features & NETIF_F_GSO;
        if (copy_to_user(useraddr, &edata, sizeof(edata)))
                 return -EFAULT;
        return 0;
}

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

        if (copy_from_user(&edata, useraddr, sizeof(edata)))
                return -EFAULT;
        if (edata.data)
                dev->features |= NETIF_F_GSO;
        else
                dev->features &= ~NETIF_F_GSO;
        return 0;
}

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

        if (ops->get_sset_count)
                test_len = ops->get_sset_count(dev, ETH_SS_TEST);
        else
                /* code path for obsolete hook */
                test_len = ops->self_test_count(dev);
        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;
        data = kmalloc(test_len * sizeof(u64), GFP_USER);
        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;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        u8 *data;
        int ret;

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

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

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

                gstrings.len = ret;
        } else {
                /* code path for obsolete hooks */

                switch (gstrings.string_set) {
                case ETH_SS_TEST:
                        if (!ops->self_test_count)
                                return -EOPNOTSUPP;
                        gstrings.len = ops->self_test_count(dev);
                        break;
                case ETH_SS_STATS:
                        if (!ops->get_stats_count)
                                return -EOPNOTSUPP;
                        gstrings.len = ops->get_stats_count(dev);
                        break;
                default:
                        return -EINVAL;
                }
        }

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

        ops->get_strings(dev, gstrings.string_set, data);

        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;
}

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;
        const struct ethtool_ops *ops = dev->ethtool_ops;
        u64 *data;
        int ret, n_stats;

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

        if (ops->get_sset_count)
                n_stats = ops->get_sset_count(dev, ETH_SS_STATS);
        else
                /* code path for obsolete hook */
                n_stats = ops->get_stats_count(dev);
        if (n_stats < 0)
                return n_stats;
        WARN_ON(n_stats == 0);

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

        stats.n_stats = n_stats;
        data = kmalloc(n_stats * sizeof(u64), GFP_USER);
        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;
}

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 };

        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);
}

/* The main entry point in this file.  Called from net/core/dev.c */

int dev_ethtool(struct net *net, struct ifreq *ifr)
{
        struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
        void __user *useraddr = ifr->ifr_data;
        u32 ethcmd;
        int rc;
        unsigned long old_features;

        if (!dev || !netif_device_present(dev))
                return -ENODEV;

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

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

        /* Allow some commands to be done by anyone */
        switch(ethcmd) {
        case ETHTOOL_GDRVINFO:
        case ETHTOOL_GMSGLVL:
        case ETHTOOL_GCOALESCE:
        case ETHTOOL_GRINGPARAM:
        case ETHTOOL_GPAUSEPARAM:
        case ETHTOOL_GRXCSUM:
        case ETHTOOL_GTXCSUM:
        case ETHTOOL_GSG:
        case ETHTOOL_GSTRINGS:
        case ETHTOOL_GTSO:
        case ETHTOOL_GPERMADDR:
        case ETHTOOL_GUFO:
        case ETHTOOL_GGSO:
        case ETHTOOL_GFLAGS:
        case ETHTOOL_GPFLAGS:
        case ETHTOOL_GRXFH:
                break;
        default:
                if (!capable(CAP_NET_ADMIN))
                        return -EPERM;
        }

        if (dev->ethtool_ops->begin)
                if ((rc = dev->ethtool_ops->begin(dev)) < 0)
                        return rc;

        old_features = dev->features;

        switch (ethcmd) {
        case ETHTOOL_GSET:
                rc = ethtool_get_settings(dev, useraddr);
                break;
        case ETHTOOL_SSET:
                rc = ethtool_set_settings(dev, useraddr);
                break;
        case ETHTOOL_GDRVINFO:
                rc = ethtool_get_drvinfo(dev, useraddr);
                break;
        case ETHTOOL_GREGS:
                rc = ethtool_get_regs(dev, useraddr);
                break;
        case ETHTOOL_GWOL:
                rc = ethtool_get_wol(dev, useraddr);
                break;
        case ETHTOOL_SWOL:
                rc = ethtool_set_wol(dev, useraddr);
                break;
        case ETHTOOL_GMSGLVL:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       dev->ethtool_ops->get_msglevel);
                break;
        case ETHTOOL_SMSGLVL:
                rc = ethtool_set_value_void(dev, useraddr,
                                       dev->ethtool_ops->set_msglevel);
                break;
        case ETHTOOL_NWAY_RST:
                rc = ethtool_nway_reset(dev);
                break;
        case ETHTOOL_GLINK:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       dev->ethtool_ops->get_link);
                break;
        case ETHTOOL_GEEPROM:
                rc = ethtool_get_eeprom(dev, useraddr);
                break;
        case ETHTOOL_SEEPROM:
                rc = ethtool_set_eeprom(dev, useraddr);
                break;
        case ETHTOOL_GCOALESCE:
                rc = ethtool_get_coalesce(dev, useraddr);
                break;
        case ETHTOOL_SCOALESCE:
                rc = ethtool_set_coalesce(dev, useraddr);
                break;
        case ETHTOOL_GRINGPARAM:
                rc = ethtool_get_ringparam(dev, useraddr);
                break;
        case ETHTOOL_SRINGPARAM:
                rc = ethtool_set_ringparam(dev, useraddr);
                break;
        case ETHTOOL_GPAUSEPARAM:
                rc = ethtool_get_pauseparam(dev, useraddr);
                break;
        case ETHTOOL_SPAUSEPARAM:
                rc = ethtool_set_pauseparam(dev, useraddr);
                break;
        case ETHTOOL_GRXCSUM:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       dev->ethtool_ops->get_rx_csum);
                break;
        case ETHTOOL_SRXCSUM:
                rc = ethtool_set_value(dev, useraddr,
                                       dev->ethtool_ops->set_rx_csum);
                break;
        case ETHTOOL_GTXCSUM:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       (dev->ethtool_ops->get_tx_csum ?
                                        dev->ethtool_ops->get_tx_csum :
                                        ethtool_op_get_tx_csum));
                break;
        case ETHTOOL_STXCSUM:
                rc = ethtool_set_tx_csum(dev, useraddr);
                break;
        case ETHTOOL_GSG:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       (dev->ethtool_ops->get_sg ?
                                        dev->ethtool_ops->get_sg :
                                        ethtool_op_get_sg));
                break;
        case ETHTOOL_SSG:
                rc = ethtool_set_sg(dev, useraddr);
                break;
        case ETHTOOL_GTSO:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       (dev->ethtool_ops->get_tso ?
                                        dev->ethtool_ops->get_tso :
                                        ethtool_op_get_tso));
                break;
        case ETHTOOL_STSO:
                rc = ethtool_set_tso(dev, useraddr);
                break;
        case ETHTOOL_TEST:
                rc = ethtool_self_test(dev, useraddr);
                break;
        case ETHTOOL_GSTRINGS:
                rc = ethtool_get_strings(dev, useraddr);
                break;
        case ETHTOOL_PHYS_ID:
                rc = ethtool_phys_id(dev, useraddr);
                break;
        case ETHTOOL_GSTATS:
                rc = ethtool_get_stats(dev, useraddr);
                break;
        case ETHTOOL_GPERMADDR:
                rc = ethtool_get_perm_addr(dev, useraddr);
                break;
        case ETHTOOL_GUFO:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       (dev->ethtool_ops->get_ufo ?
                                        dev->ethtool_ops->get_ufo :
                                        ethtool_op_get_ufo));
                break;
        case ETHTOOL_SUFO:
                rc = ethtool_set_ufo(dev, useraddr);
                break;
        case ETHTOOL_GGSO:
                rc = ethtool_get_gso(dev, useraddr);
                break;
        case ETHTOOL_SGSO:
                rc = ethtool_set_gso(dev, useraddr);
                break;
        case ETHTOOL_GFLAGS:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       dev->ethtool_ops->get_flags);
                break;
        case ETHTOOL_SFLAGS:
                rc = ethtool_set_value(dev, useraddr,
                                       dev->ethtool_ops->set_flags);
                break;
        case ETHTOOL_GPFLAGS:
                rc = ethtool_get_value(dev, useraddr, ethcmd,
                                       dev->ethtool_ops->get_priv_flags);
                break;
        case ETHTOOL_SPFLAGS:
                rc = ethtool_set_value(dev, useraddr,
                                       dev->ethtool_ops->set_priv_flags);
                break;
        case ETHTOOL_GRXFH:
                rc = ethtool_get_rxhash(dev, useraddr);
                break;
        case ETHTOOL_SRXFH:
                rc = ethtool_set_rxhash(dev, useraddr);
                break;
        default:
                rc = -EOPNOTSUPP;
        }

        if (dev->ethtool_ops->complete)
                dev->ethtool_ops->complete(dev);

        if (old_features != dev->features)
                netdev_features_change(dev);

        return rc;
}

EXPORT_SYMBOL(ethtool_op_get_link);
EXPORT_SYMBOL(ethtool_op_get_sg);
EXPORT_SYMBOL(ethtool_op_get_tso);
EXPORT_SYMBOL(ethtool_op_get_tx_csum);
EXPORT_SYMBOL(ethtool_op_set_sg);
EXPORT_SYMBOL(ethtool_op_set_tso);
EXPORT_SYMBOL(ethtool_op_set_tx_csum);
EXPORT_SYMBOL(ethtool_op_set_tx_hw_csum);
EXPORT_SYMBOL(ethtool_op_set_tx_ipv6_csum);
EXPORT_SYMBOL(ethtool_op_set_ufo);
EXPORT_SYMBOL(ethtool_op_get_ufo);
EXPORT_SYMBOL(ethtool_op_set_flags);
EXPORT_SYMBOL(ethtool_op_get_flags);

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