cfg80211: add support for changing the device mac address via sysfs

Signed-off-by: Felix Fietkau <[email protected]>

SVN-Revision: 43638

package/kernel/mac80211/patches/120-cfg80211_allow_perm_addr_change.patch

@@ -0,0 +1,43 @@
+--- a/net/wireless/sysfs.c
++++ b/net/wireless/sysfs.c
+@@ -24,18 +24,35 @@ static inline struct cfg80211_registered
+ 	return container_of(dev, struct cfg80211_registered_device, wiphy.dev);
+ }
+ 
+-#define SHOW_FMT(name, fmt, member)					\
++#define SHOW_FMT(name, fmt, member, mode)				\
+ static ssize_t name ## _show(struct device *dev,			\
+ 			      struct device_attribute *attr,		\
+ 			      char *buf)				\
+ {									\
+ 	return sprintf(buf, fmt "\n", dev_to_rdev(dev)->member);	\
+ }									\
+-static DEVICE_ATTR_RO(name)
++static DEVICE_ATTR_##mode(name)
+ 
+-SHOW_FMT(index, "%d", wiphy_idx);
+-SHOW_FMT(macaddress, "%pM", wiphy.perm_addr);
+-SHOW_FMT(address_mask, "%pM", wiphy.addr_mask);
++static ssize_t macaddress_store(struct device *dev,
++				struct device_attribute *attr,
++				const char *buf, size_t len)
++{
++	u8 mac[ETH_ALEN];
++
++	if (!mac_pton(buf, mac))
++		return -EINVAL;
++
++	if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n')
++		return -EINVAL;
++
++	memcpy(dev_to_rdev(dev)->wiphy.perm_addr, mac, ETH_ALEN);
++
++	return strnlen(buf, len);
++}
++
++SHOW_FMT(index, "%d", wiphy_idx, RO);
++SHOW_FMT(macaddress, "%pM", wiphy.perm_addr, RW);
++SHOW_FMT(address_mask, "%pM", wiphy.addr_mask, RO);
+ 
+ static ssize_t name_show(struct device *dev,
+ 			 struct device_attribute *attr,