ethtool.c

linux 内核源代码

	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:
		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;
	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);