| From: Felix Fietkau <nbd@nbd.name> |
| Date: Thu, 11 Dec 2014 00:00:00 +0100 |
| Subject: [PATCH] cfg80211: add support for changing the device mac address via |
| sysfs |
| |
| --- |
| net/wireless/sysfs.c | 27 ++++++++++++++++++++++----- |
| 1 file changed, 22 insertions(+), 5 deletions(-) |
| |
| --- 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, |