dnsmasq: configure dynamic dhcp6 and dhcp4 independently

Given ipv6 has SLAAC it is quite plausible to wish to use dynamic
dhcp4 but static dhcp6. This patch keeps dynamicdhcp as the default
option for both, but is overridden by dynamicdhcpv6 or dynamicdhcpv4

Signed-off-by: Ian Dall <[email protected]>

package/network/services/dnsmasq/files/dnsmasq.init

@@ -557,6 +557,8 @@ dhcp_add() {
 	config_get leasetime "$cfg" leasetime 12h
 	config_get options "$cfg" options
 	config_get_bool dynamicdhcp "$cfg" dynamicdhcp 1
+	config_get_bool dynamicdhcpv4 "$cfg" dynamicdhcpv4 $dynamicdhcp
+	config_get_bool dynamicdhcpv6 "$cfg" dynamicdhcpv6 $dynamicdhcp
 
 	config_get dhcpv4 "$cfg" dhcpv4
 	config_get dhcpv6 "$cfg" dhcpv6
@@ -586,12 +588,12 @@ dhcp_add() {
 
 	# make sure the DHCP range is not empty
 	if [ "$dhcpv4" != "disabled" ] && eval "$(ipcalc.sh "${subnet%%/*}" "$netmask" "$start" "$limit")" ; then
-		[ "$dynamicdhcp" = "0" ] && END="static"
+		[ "$dynamicdhcpv4" = "0" ] && END="static"
 
 		xappend "--dhcp-range=$tags$nettag$START,$END,$NETMASK,$leasetime${options:+ $options}"
 	fi
 
-	if [ "$dynamicdhcp" = "0" ] ; then
+	if [ "$dynamicdhcpv6" = "0" ] ; then
 		dhcp6range="::,static"
 	else
 		dhcp6range="::1000,::ffff"