+function phy_sysfs_file(phy, name)
+{
+ return trim(readfile(`/sys/class/ieee80211/${phy}/${name}`));
+}
+
+function macaddr_split(str)
+{
+ return map(split(str, ":"), (val) => hex(val));
+}
+
+function macaddr_join(addr)
+{
+ return join(":", map(addr, (val) => sprintf("%02x", val)));
+}
+
+function wdev_generate_macaddr(phy, data)
+{
+ let idx = int(data.id ?? 0);
+ let mbssid = int(data.mbssid ?? 0) > 0;
+ let num_global = int(data.num_global ?? 1);
+ let use_global = !mbssid && idx < num_global;
+
+ let base_addr = phy_sysfs_file(phy, "macaddress");
+ if (!base_addr)
+ return null;
+
+ if (!idx && !mbssid)
+ return base_addr;
+
+ let base_mask = phy_sysfs_file(phy, "address_mask");
+ if (!base_mask)
+ return null;
+
+ if (base_mask == "00:00:00:00:00:00" && idx >= num_global) {
+ let addrs = split(phy_sysfs_file(phy, "addresses"), "\n");
+
+ if (idx < length(addrs))
+ return addrs[idx];
+
+ base_mask = "ff:ff:ff:ff:ff:ff";
+ }
+
+ let addr = macaddr_split(base_addr);
+ let mask = macaddr_split(base_mask);
+ let type;
+
+ if (mbssid)
+ type = "b5";
+ else if (use_global)
+ type = "add";
+ else if (mask[0] > 0)
+ type = "b1";
+ else if (mask[5] < 0xff)
+ type = "b5";
+ else
+ type = "add";
+
+ switch (type) {
+ case "b1":
+ if (!(addr[0] & 2))
+ idx--;
+ addr[0] |= 2;
+ addr[0] ^= idx << 2;
+ break;
+ case "b5":
+ if (mbssid)
+ addr[0] |= 2;
+ addr[5] ^= idx;
+ break;
+ default:
+ for (let i = 5; i > 0; i--) {
+ addr[i] += idx;
+ if (addr[i] < 256)
+ break;
+ addr[i] %= 256;
+ }
+ break;
+ }
+
+ return macaddr_join(addr);
+}
+