[NET]: Add support for getting the permanent hardware address.

This patch adds a new field to net device to hold the permanent
hardware address, and adds a new generic ethtool_op function to
get that address.

Signed-off-by: Jon Wetzel <jon_wetzel@dell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 49 insertions, 0 deletions

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index a3eeb88e1c81..289c1b5a8e4a 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -81,6 +81,18 @@ int ethtool_op_set_tso(struct net_device *dev, u32 data)
 	return 0;
 }
 
+int ethtool_op_get_perm_addr(struct net_device *dev, struct ethtool_perm_addr *addr, u8 *data)
+{
+	unsigned char len = dev->addr_len;
+	if ( addr->size < len )
+		return -ETOOSMALL;
+	
+	addr->size = len;
+	memcpy(data, dev->perm_addr, len);
+	return 0;
+}
+ 
+
 /* Handlers for each ethtool command */
 
 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
@@ -683,6 +695,39 @@ static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
 	return ret;
 }
 
+static int ethtool_get_perm_addr(struct net_device *dev, void *useraddr)
+{
+	struct ethtool_perm_addr epaddr;
+	u8 *data;
+	int ret;
+
+	if (!dev->ethtool_ops->get_perm_addr)
+		return -EOPNOTSUPP;
+
+	if (copy_from_user(&epaddr,useraddr,sizeof(epaddr)))
+		return -EFAULT;
+
+	data = kmalloc(epaddr.size, GFP_USER);
+	if (!data)
+		return -ENOMEM;
+
+	ret = dev->ethtool_ops->get_perm_addr(dev,&epaddr,data);
+	if (ret)
+		return ret;
+
+	ret = -EFAULT;
+	if (copy_to_user(useraddr, &epaddr, sizeof(epaddr)))
+		goto out;
+	useraddr += sizeof(epaddr);
+	if (copy_to_user(useraddr, data, epaddr.size))
+		goto out;
+	ret = 0;
+
+ out:
+	kfree(data);
+	return ret;
+}
+
 /* The main entry point in this file.  Called from net/core/dev.c */
 
 int dev_ethtool(struct ifreq *ifr)
@@ -806,6 +851,9 @@ int dev_ethtool(struct ifreq *ifr)
 	case ETHTOOL_GSTATS:
 		rc = ethtool_get_stats(dev, useraddr);
 		break;
+	case ETHTOOL_GPERMADDR:
+		rc = ethtool_get_perm_addr(dev, useraddr);
+		break;
 	default:
 		rc =  -EOPNOTSUPP;
 	}
@@ -826,6 +874,7 @@ int dev_ethtool(struct ifreq *ifr)
 
 EXPORT_SYMBOL(dev_ethtool);
 EXPORT_SYMBOL(ethtool_op_get_link);
+EXPORT_SYMBOL_GPL(ethtool_op_get_perm_addr);
 EXPORT_SYMBOL(ethtool_op_get_sg);
 EXPORT_SYMBOL(ethtool_op_get_tso);
 EXPORT_SYMBOL(ethtool_op_get_tx_csum);