NL80211_WIPHY_NAME_MAXLEN
char target[3 * 3 + 11 + (NL80211_WIPHY_NAME_MAXLEN + 1) +
char buf[3 * 3 + 11 + (NL80211_WIPHY_NAME_MAXLEN + 1) +
if (strlen(newname) > NL80211_WIPHY_NAME_MAXLEN)