#! /usr/bin/make

PF_EXT_SLIB:=tcp udp icmp mac limit standard REJECT LOG unclean state multiport tos TOS mark MARK owner SNAT DNAT MASQUERADE REDIRECT MIRROR SAME
PF6_EXT_SLIB:=tcp udp icmpv6 standard MARK mark

# The following may not be present, but compile them anyway.
PF_EXT_SLIB+=FTOS TCPMSS TTL ULOG ah esp iplimit tcpmss ttl

# Optionals
PF_EXT_SLIB_OPTS:=$(foreach T,$(wildcard extensions/.*-test),$(shell KERNEL_DIR=$(KERNEL_DIR) $(T)))
PF6_EXT_SLIB_OPTS:=$(foreach T,$(wildcard extensions/.*-test6),$(shell KERNEL_DIR=$(KERNEL_DIR) $(T)))

PF_EXT_SLIB+=$(PF_EXT_SLIB_OPTS)
PF6_EXT_SLIB+=$(PF6_EXT_SLIB_OPTS)

OPTIONALS+=$(patsubst %,IPv4:%,$(PF_EXT_SLIB_OPTS))
OPTIONALS+=$(patsubst %,IPv6:%,$(PF6_EXT_SLIB_OPTS))

ifndef NO_SHARED_LIBS
SHARED_LIBS+=$(foreach T,$(PF_EXT_SLIB),extensions/libipt_$(T).so)
EXTRA_INSTALLS+=$(foreach T, $(PF_EXT_SLIB), $(DESTDIR)$(LIBDIR)/iptables/libipt_$(T).so)

ifdef DO_IPV6
SHARED_LIBS+=$(foreach T,$(PF6_EXT_SLIB),extensions/libip6t_$(T).so)
EXTRA_INSTALLS+=$(foreach T, $(PF6_EXT_SLIB), $(DESTDIR)$(LIBDIR)/iptables/libip6t_$(T).so)
endif
else 	# NO_SHARED_LIBS
EXT_OBJS+=$(foreach T,$(PF_EXT_SLIB),extensions/libipt_$(T).o)
EXT_FUNC+=$(foreach T,$(PF_EXT_SLIB),ipt_$(T))
EXT_OBJS+= extensions/initext.o
EXT6_OBJS+=$(foreach T,$(PF6_EXT_SLIB),extensions/libip6t_$(T).o)
EXT6_FUNC+=$(foreach T,$(PF6_EXT_SLIB),ip6t_$(T))
EXT6_OBJS+= extensions/initext6.o
endif

ifndef TOPLEVEL_INCLUDED
local:
	cd .. && $(MAKE) $(SHARED_LIBS)
endif

ifdef NO_SHARED_LIBS
extensions/libext.a: $(EXT_OBJS)
	rm -f $@; ar crv $@ $(EXT_OBJS)

extensions/libext6.a: $(EXT6_OBJS)
	rm -f $@; ar crv $@ $(EXT6_OBJS)

extensions/initext.o: extensions/initext.c
extensions/initext6.o: extensions/initext6.c

extensions/initext.c: extensions/Makefile
	echo "" > $@
	for i in $(EXT_FUNC); do \
		echo "extern void $${i}_init(void);" >> $@; \
	done
	echo "void init_extensions(void) {" >> $@
	for i in $(EXT_FUNC); do \
		echo "	$${i}_init();" >> $@; \
	done
	echo "}" >> $@

extensions/initext6.c: extensions/Makefile
	echo "" > $@
	for i in $(EXT6_FUNC); do \
		echo "extern void $${i}_init(void);" >> $@; \
	done
	echo "void init_extensions(void) {" >> $@
	for i in $(EXT6_FUNC); do \
		echo "	$${i}_init();" >> $@; \
	done
	echo "}" >> $@

extensions/lib%.o: extensions/lib%.c
	$(CC) $(CFLAGS) -D_INIT=$*_init -c -o $@ $<

endif
 
$(DESTDIR)$(LIBDIR)/iptables/libipt_%.so: extensions/libipt_%.so
	@[ -d $(DESTDIR)$(LIBDIR)/iptables ] || mkdir -p $(DESTDIR)$(LIBDIR)/iptables
	cp $< $@

$(DESTDIR)$(LIBDIR)/iptables/libip6t_%.so: extensions/libip6t_%.so
	@[ -d $(DESTDIR)$(LIBDIR)/iptables ] || mkdir -p $(DESTDIR)$(LIBDIR)/iptables
	cp $< $@