dnsmasq: Add EDNS0 Upstream support

Forward client mac address and subnet on dns queries. Pi-hole and Adguard use this feature to send the originators ip address/subnet so it can be logged and not just the nat address of the router. This feature has been added since version 2.56 of dnsmasq and would be nice to expose this feature in openwrt.

Signed-off-by: Carsten Schuette <schuettecarsten@googlemail.com>
Link: https://github.com/openwrt/openwrt/pull/15965
Signed-off-by: Robert Marko <robimarko@gmail.com>

package/network/services/dnsmasq/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=dnsmasq
 PKG_UPSTREAM_VERSION:=2.90
 PKG_VERSION:=$(subst test,~~test,$(subst rc,~rc,$(PKG_UPSTREAM_VERSION)))
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_UPSTREAM_VERSION).tar.xz
 PKG_SOURCE_URL:=https://thekelleys.org.uk/dnsmasq/

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

@@ -1108,6 +1108,9 @@ dnsmasq_start()
 		[ "$addmac" = "1" ] && addmac=
 		xappend "--add-mac${addmac:+="$addmac"}"
 	}
+	append_bool "$cfg" stripmac "--strip-mac"
+	append_parm "$cfg" addsubnet "--add-subnet"
+	append_bool "$cfg" stripsubnet "--strip-subnet"
 
 	dhcp_option_add "$cfg" "" 0
 	dhcp_option_add "$cfg" "" 2