trafficshaper: avoid recursive dependency

The conditional nftables dependency causes Kconfig to select
PACKAGE_nftables-nojson from itself:

  symbol PACKAGE_nftables-nojson is selected by PACKAGE_nftables-nojson

Split the firewall dependencies into nftables and iptables variants. Keep
trafficshaper as the default nftables variant and provide
trafficshaper-iptables for older systems.

Fixes: 2e945de232 ("trafficshaper: add nftables firewall backend")

Signed-off-by: Dharmik Parmar <dharmikparmar2004@yahoo.com>

net/trafficshaper/Makefile

@@ -8,26 +8,39 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=trafficshaper
 PKG_VERSION:=1.0.0
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 PKG_MAINTAINER:=Luiz Angelo Daros de Luca <luizluca@gmail.com>
 
 PKG_LICENSE:=GPL-2.0-or-later
 
 include $(INCLUDE_DIR)/package.mk
 
-define Package/trafficshaper
+define Package/trafficshaper/Default
   SECTION:=net
   CATEGORY:=Network
   TITLE:=WAN traffic shaper based on LAN addresses
   DEPENDS:=+tc +kmod-sched-core +kmod-sched-connmark +kmod-ifb \
-	+(PACKAGE_nftables-json||PACKAGE_nftables-nojson):nftables \
-	+!(PACKAGE_nftables-json||PACKAGE_nftables-nojson):iptables \
-	+(IPV6&&!(PACKAGE_nftables-json||PACKAGE_nftables-nojson)):ip6tables \
-	+kmod-sched-cake \
-	+!(PACKAGE_nftables-json||PACKAGE_nftables-nojson):iptables-mod-conntrack-extra
+	+kmod-sched-cake
+  PROVIDES:=trafficshaper
   PKGARCH:=all
 endef
 
+define Package/trafficshaper
+  $(call Package/trafficshaper/Default)
+  TITLE+= (nftables)
+  DEPENDS+= +nftables
+  VARIANT:=nftables
+  DEFAULT_VARIANT:=1
+endef
+
+define Package/trafficshaper-iptables
+  $(call Package/trafficshaper/Default)
+  TITLE+= (iptables)
+  DEPENDS+= +iptables +IPV6:ip6tables +iptables-mod-conntrack-extra
+  VARIANT:=iptables
+  CONFLICTS:=trafficshaper
+endef
+
 define Package/trafficshaper/description
   Setup QoS rules to limit (or reserve) traffic used by classes of clients.
   Uplink and downlink can be controlled (or not controlled) independently.
@@ -36,10 +49,16 @@ define Package/trafficshaper/description
   the use (or not) of spare wan bandwidth when available.
 endef
 
+define Package/trafficshaper-iptables/description
+  $(call Package/trafficshaper/description)
+endef
+
 define Package/trafficshaper/conffiles
 /etc/config/trafficshaper
 endef
 
+Package/trafficshaper-iptables/conffiles = $(Package/trafficshaper/conffiles)
+
 define Build/Compile
 endef
 
@@ -50,4 +69,7 @@ define Package/trafficshaper/install
 	$(INSTALL_BIN) ./files/trafficshaper.init $(1)/etc/init.d/trafficshaper
 endef
 
+Package/trafficshaper-iptables/install = $(Package/trafficshaper/install)
+
 $(eval $(call BuildPackage,trafficshaper))
+$(eval $(call BuildPackage,trafficshaper-iptables))