Add package gluon-ebtables-filter-multicast-ffhh

This package provides some additional ebtables multicast rules to
gluon-ebtables-filter-multicast for the Freifunk Hamburg network.

current changes:
drop icmpv6 echo-requests to all-nodes & all-routers

gluon-ebtables-filter-multicast-ffhh/Makefile

@@ -0,0 +1,42 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=gluon-ebtables-filter-multicast-ffhh
+PKG_VERSION:=1
+PKG_RELEASE:=1
+
+PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/gluon-ebtables-filter-multicast-ffhh
+  SECTION:=gluon
+  CATEGORY:=Gluon
+  TITLE:=Ebtables filters for multicast packets
+  DEPENDS:=+gluon-core +gluon-ebtables gluon-ebtables-filter-multicast
+endef
+
+define Package/gluon-ebtables-filter-multicast-ffhh/description
+	Gluon community wifi mesh firmware framework: Ebtables filters for multicast packets
+
+	These filters drop non-essential multicast traffic before it enters the mesh.
+
+	Allowed protocols are: DHCP, DHCPv6, ARP, ICMP, ICMPv6, BitTorrent local peer discovery, BABEL and OSPF
+
+	This package provides some additional rules for the Freifunk Hamburg network
+endef
+
+define Build/Prepare
+	mkdir -p $(PKG_BUILD_DIR)
+endef
+
+define Build/Configure
+endef
+
+define Build/Compile
+endef
+
+define Package/gluon-ebtables-filter-multicast-ffhh/install
+	$(CP) ./files/* $(1)/
+endef
+
+$(eval $(call BuildPackage,gluon-ebtables-filter-multicast-ffhh))

gluon-ebtables-filter-multicast-ffhh/files/lib/gluon/ebtables/105-mcast-drop-icmpv6

@@ -0,0 +1,2 @@
+rule 'MULTICAST_OUT -p IPv6 --ip6-destination ff02::1 --ip6-protocol ipv6-icmp --ip6-icmp-type echo-request -j DROP'
+rule 'MULTICAST_OUT -p IPv6 --ip6-destination ff02::2 --ip6-protocol ipv6-icmp --ip6-icmp-type echo-request -j DROP'