Makefile

# SPDX-License-Identifier: GPL-2.0-only
# Copyright (c) 2018 Chion Tang <tech@chionlab.moe>
#   Original xt_FULLCONENAT and related iptables extension author
# Copyright (c) 2019-2022 GitHub/llccd Twitter/@gNodeB
#   Added IPv6 support for xt_FULLCONENAT and ip6tables extension
#   Ported to recent kernel versions
# Copyright (c) 2022 Syrone Wong <wong.syrone@gmail.com>
#   Massively rewrite the whole module, split the original code into library and nftables 'fullcone' expression module

include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/kernel.mk

PKG_NAME:=nft-fullcone
PKG_RELEASE:=1

include $(INCLUDE_DIR)/package.mk

define KernelPackage/nft-fullcone
  SUBMENU:=Netfilter Extensions
  DEPENDS:=@IPV6 +kmod-nft-core +kmod-nf-conntrack +kmod-nf-conntrack6
  TITLE:=nftables fullcone expression support
  FILES:= $(PKG_BUILD_DIR)/nft_fullcone.ko
  KCONFIG:= CONFIG_NFT_FULLCONE=y CONFIG_NF_NAT=y CONFIG_NF_NAT_IPV6=y CONFIG_NF_CONNTRACK_EVENTS=y CONFIG_NF_CONNTRACK_CHAIN_EVENTS=y
  PROVIDES:=$(PKG_NAME)
  AUTOLOAD:=$(call AutoProbe,nft_fullcone)
endef

define KernelPackage/nft-fullcone/Description
Kernel module adds the fullcone expression that you can use
to perform NAT in the RFC3489-compatible full cone SNAT flavour.
Currently only UDP traffic is supported for full-cone NAT.
For other protos FULLCONENAT is equivalent to MASQUERADE.
endef

# make use of all CPUs
define Build/Compile
	+$(MAKE) $(PKG_JOBS) $(KERNEL_MAKEOPTS) \
		M="$(PKG_BUILD_DIR)" \
		EXTRA_CFLAGS="$(BUILDFLAGS)" \
		$(if $(CONFIG_IPv6),EXTRA_CFLAGS+="-DCONFIG_SFE_ECM",) \
		modules

endef

$(eval $(call KernelPackage,nft-fullcone))