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

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 43638

diff --git a/package/kernel/mac80211/patches/120-cfg80211_allow_perm_addr_change.patch b/package/kernel/mac80211/patches/120-cfg80211_allow_perm_addr_change.patch
new file mode 100644 (file)
index 0000000..ffd8807
--- /dev/null
+++ b/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,