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

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Thu, 11 Dec 2014 00:00:00 +0100
   3 Subject: [PATCH] cfg80211: add support for changing the device mac address via
   4  sysfs
   5
   6 ---
   7  net/wireless/sysfs.c | 27 ++++++++++++++++++++++-----
   8  1 file changed, 22 insertions(+), 5 deletions(-)
   9
  10 --- a/net/wireless/sysfs.c
  11 +++ b/net/wireless/sysfs.c
  12 @@ -24,18 +24,35 @@ static inline struct cfg80211_registered
  13         return container_of(dev, struct cfg80211_registered_device, wiphy.dev);
  14  }
  15
  16 -#define SHOW_FMT(name, fmt, member)                                    \
  17 +#define SHOW_FMT(name, fmt, member, mode)                              \
  18  static ssize_t name ## _show(struct device *dev,                       \
  19                               struct device_attribute *attr,            \
  20                               char *buf)                                \
  21  {                                                                      \
  22         return sprintf(buf, fmt "\n", dev_to_rdev(dev)->member);        \
  23  }                                                                      \
  24 -static DEVICE_ATTR_RO(name)
  25 +static DEVICE_ATTR_##mode(name)
  26
  27 -SHOW_FMT(index, "%d", wiphy_idx);
  28 -SHOW_FMT(macaddress, "%pM", wiphy.perm_addr);
  29 -SHOW_FMT(address_mask, "%pM", wiphy.addr_mask);
  30 +static ssize_t macaddress_store(struct device *dev,
  31 +                               struct device_attribute *attr,
  32 +                               const char *buf, size_t len)
  33 +{
  34 +       u8 mac[ETH_ALEN];
  35 +
  36 +       if (!mac_pton(buf, mac))
  37 +               return -EINVAL;
  38 +
  39 +       if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n')
  40 +               return -EINVAL;
  41 +
  42 +       memcpy(dev_to_rdev(dev)->wiphy.perm_addr, mac, ETH_ALEN);
  43 +
  44 +       return strnlen(buf, len);
  45 +}
  46 +
  47 +SHOW_FMT(index, "%d", wiphy_idx, RO);
  48 +SHOW_FMT(macaddress, "%pM", wiphy.perm_addr, RW);
  49 +SHOW_FMT(address_mask, "%pM", wiphy.addr_mask, RO);
  50
  51  static ssize_t name_show(struct device *dev,
  52                          struct device_attribute *attr,