base-files: wifi: add random MAC support for wifi-iface

Add support for randomly generating a MAC address for a wifi-iface
instance by setting `macaddr` to `random`
When set to `random`, a new locally administered unicast MAC address
is generated and assigned to the iface everytime it is (re-)configured

Signed-off-by: Manas Sambhus <manas.sambhus+github@gmail.com>

package/kernel/mac80211/Makefile

@@ -11,7 +11,7 @@ include $(INCLUDE_DIR)/kernel.mk
 PKG_NAME:=mac80211
 
 PKG_VERSION:=5.15.58-1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_SOURCE_URL:=@KERNEL/linux/kernel/projects/backports/stable/v5.15.58/
 PKG_HASH:=a3c2a2b7bbaf8943c65fd72f4e7d7ad5e205aeae28b26c835f9d8afa0f9810bf
 

package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 . /lib/netifd/netifd-wireless.sh
 . /lib/netifd/hostapd.sh
+. /lib/functions/system.sh
 
 init_wireless_driver "$@"
 
@@ -667,10 +668,12 @@ mac80211_prepare_vif() {
 
 	json_select ..
 
-	[ -n "$macaddr" ] || {
+	if [ -z "$macaddr" ]; then
 		macaddr="$(mac80211_generate_mac $phy)"
 		macidx="$(($macidx + 1))"
-	}
+	elif [ "$macaddr" = 'random' ]; then
+		macaddr="$(macaddr_random)"
+	fi
 
 	json_add_object data
 	json_add_string ifname "$ifname"