dnsmasq: Add conntrack support in the full variant

Conntrack support reads the connection track mark associated with
incoming DNS queries and sets the same mark value on the upstream
forwarded DNS query. This can be usefull to track traffic generated
by dnsmasq to associate it with the clients who generate the queries,
usefull for bandwidth accouting and firewall.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

package/network/services/dnsmasq/Makefile

@@ -25,7 +25,8 @@ PKG_BUILD_PARALLEL:=1
 PKG_CONFIG_DEPENDS:=CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_dhcpv6 \
 	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_dnssec \
 	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_auth \
-	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_ipset
+	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_ipset \
+	CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_conntrack
 
 include $(INCLUDE_DIR)/package.mk
 
@@ -51,9 +52,10 @@ endef
 
 define Package/dnsmasq-full
 $(call Package/dnsmasq/Default)
-  TITLE += (with DNSSEC, DHCPv6, Auth DNS, IPset enabled by default)
+  TITLE += (with DNSSEC, DHCPv6, Auth DNS, IPset, Conntrack enabled by default)
   DEPENDS:=+PACKAGE_dnsmasq_full_dnssec:libnettle \
-	+PACKAGE_dnsmasq_full_ipset:kmod-ipt-ipset
+	+PACKAGE_dnsmasq_full_ipset:kmod-ipt-ipset \
+	+PACKAGE_dnsmasq_full_conntrack:libnetfilter-conntrack
   VARIANT:=full
 endef
 
@@ -70,8 +72,8 @@ endef
 define Package/dnsmasq-full/description
 $(call Package/dnsmasq/description)
 
-This is a fully configurable variant with DHCPv6, DNSSEC, Authroitative DNS and
-IPset support enabled by default.
+This is a fully configurable variant with DHCPv6, DNSSEC, Authoritative DNS and
+IPset, Conntrack support enabled by default.
 endef
 
 define Package/dnsmasq/conffiles
@@ -94,6 +96,9 @@ define Package/dnsmasq-full/config
 	config PACKAGE_dnsmasq_full_ipset
 		bool "Build with IPset support."
 		default y
+	config PACKAGE_dnsmasq_full_conntrack
+		bool "Build with Conntrack support."
+		default y
 	endif
 endef
 
@@ -113,7 +118,8 @@ ifeq ($(BUILD_VARIANT),full)
 	COPTS += $(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_dhcpv6),,-DNO_DHCP6) \
 		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_dnssec),-DHAVE_DNSSEC) \
 		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_auth),,-DNO_AUTH) \
-		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_ipset),,-DNO_IPSET)
+		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_ipset),,-DNO_IPSET) \
+		$(if $(CONFIG_PACKAGE_dnsmasq_$(BUILD_VARIANT)_conntrack),-DHAVE_CONNTRACK,)
 	COPTS += $(if $(CONFIG_LIBNETTLE_MINI),-DNO_GMP,)
 else
 	COPTS += -DNO_AUTH -DNO_IPSET