#! /usr/bin/make

# WARNING:
# only add extensions here that are either present in the kernel, or whose
# header files are present in the include/linux directory of this iptables
# package (HW)
#
PF_EXT_SLIB:=ah addrtype comment connlimit connmark conntrack dscp ecn esp hashlimit helper icmp iprange length limit mac mark multiport owner physdev pkttype realm rpc sctp standard state tcp tcpmss tos ttl udp unclean CLASSIFY CONNMARK DNAT DSCP ECN LOG MARK MASQUERADE MIRROR NETMAP NFQUEUE NOTRACK REDIRECT REJECT SAME SNAT TARPIT TCPMSS TOS TRACE TTL ULOG
PF6_EXT_SLIB:=eui64 hl icmpv6 length limit mac mark multiport owner physdev standard tcp udp HL LOG NFQUEUE MARK TRACE

# 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_ALL_SLIB:=$(patsubst extensions/libipt_%.c, %, $(wildcard extensions/libipt_*.c))
PF6_EXT_ALL_SLIB:=$(patsubst extensions/libip6t_%.c, %, $(wildcard extensions/libip6t_*.c))

PF_EXT_MAN_ALL_MATCHES:=$(foreach T,$(PF_EXT_ALL_SLIB),$(shell test -f extensions/libipt_$(T).man && grep -q register_match extensions/libipt_$(T).c  && echo $(T)))
PF_EXT_MAN_ALL_TARGETS:=$(foreach T,$(PF_EXT_ALL_SLIB),$(shell test -f extensions/libipt_$(T).man && grep -q register_target extensions/libipt_$(T).c && echo $(T)))
PF6_EXT_MAN_ALL_MATCHES:=$(foreach T,$(PF6_EXT_ALL_SLIB),$(shell test -f extensions/libip6t_$(T).man && grep -q register_match6 extensions/libip6t_$(T).c  && echo $(T)))
PF6_EXT_MAN_ALL_TARGETS:=$(foreach T,$(PF6_EXT_ALL_SLIB),$(shell test -f extensions/libip6t_$(T).man && grep -q register_target6 extensions/libip6t_$(T).c && echo $(T)))

PF_EXT_MAN_MATCHES:=$(filter $(PF_EXT_ALL_SLIB), $(PF_EXT_MAN_ALL_MATCHES))
PF_EXT_MAN_TARGETS:=$(filter $(PF_EXT_ALL_SLIB), $(PF_EXT_MAN_ALL_TARGETS))
PF_EXT_MAN_EXTRA_MATCHES:=$(filter-out $(PF_EXT_MAN_MATCHES), $(PF_EXT_MAN_ALL_MATCHES))
PF_EXT_MAN_EXTRA_TARGETS:=$(filter-out $(PF_EXT_MAN_TARGETS), $(PF_EXT_MAN_ALL_TARGETS))
PF6_EXT_MAN_MATCHES:=$(filter $(PF6_EXT_ALL_SLIB), $(PF6_EXT_MAN_ALL_MATCHES))
PF6_EXT_MAN_TARGETS:=$(filter $(PF6_EXT_ALL_SLIB), $(PF6_EXT_MAN_ALL_TARGETS))
PF6_EXT_MAN_EXTRA_MATCHES:=$(filter-out $(PF6_EXT_MAN_MATCHES), $(PF6_EXT_MAN_ALL_MATCHES))
PF6_EXT_MAN_EXTRA_TARGETS:=$(filter-out $(PF6_EXT_MAN_TARGETS), $(PF6_EXT_MAN_ALL_TARGETS))


allman:
	@echo ALL_SLIB: $(PF_EXT_ALL_SLIB)
	@echo ALL_MATCH: $(PF_EXT_MAN_ALL_MATCHES)
	@echo ALL_TARGET: $(PF_EXT_MAN_ALL_TARGETS)

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)

ifeq ($(DO_IPV6), 1)
SHARED_LIBS+=$(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_$(T))
EXT_OBJS+= extensions/initext.o
ifeq ($(DO_IPV6), 1)
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	# DO_IPV6
endif	# NO_SHARED_LIBS

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
 
EXTRAS += extensions/libipt_targets.man
extensions/libipt_targets.man: $(patsubst %,extensions/libipt_%.man,$(PF_EXT_MAN_ALL_TARGETS))
	@for ext in $(PF_EXT_MAN_TARGETS); do \
	    echo ".SS $$ext" ;\
	    cat extensions/libipt_$$ext.man ;\
	done >extensions/libipt_targets.man
	@if [ -n "$(PF_EXT_MAN_EXTRA_TARGETS)" ]; then \
	    extra=$(PF_EXT_MAN_EXTRA_TARGETS) ;\
	    for ext in $${extra:-""}; do \
		echo ".SS $$ext (not supported, see Patch-O-Matic)" ;\
		cat extensions/libipt_$$ext.man ;\
	    done ;\
       	fi >>extensions/libipt_targets.man

EXTRAS += extensions/libipt_matches.man
extensions/libipt_matches.man: $(patsubst %,extensions/libipt_%.man,$(PF_EXT_MAN_ALL_MATCHES))
	@for ext in $(PF_EXT_MAN_MATCHES); do \
	    echo ".SS $$ext" ;\
	    cat extensions/libipt_$$ext.man ;\
	done >extensions/libipt_matches.man
	@if [ -n "$(PF_EXT_MAN_EXTRA_MATCHES)" ]; then \
	    extra=$(PF_EXT_MAN_EXTRA_MATCHES) ;\
	    for ext in $${extra:-""}; do \
		echo ".SS $$ext (not supported, see Patch-O-Matic)" ;\
		cat extensions/libipt_$$ext.man ;\
	    done ;\
       	fi >>extensions/libipt_matches.man

EXTRAS += extensions/libip6t_targets.man
extensions/libip6t_targets.man: $(patsubst %, extensions/libip6t_%.man, $(PF6_EXT_MAN_ALL_TARGETS))
	@for ext in $(PF6_EXT_MAN_TARGETS); do \
	    echo ".SS $$ext" ;\
	    cat extensions/libip6t_$$ext.man ;\
	done >extensions/libip6t_targets.man
	@if [ -n "$(PF6_EXT_MAN_EXTRA_TARGETS)" ]; then \
	    extra=$(PF6_EXT_MAN_EXTRA_TARGETS) ;\
	    for ext in $${extra:-""}; do \
		echo ".SS $$ext (not supported, see Patch-O-Matic)" ;\
		cat extensions/libip6t_$$ext.man ;\
	    done ;\
       	fi >>extensions/libip6t_targets.man

EXTRAS += extensions/libip6t_matches.man
extensions/libip6t_matches.man: $(patsubst %, extensions/libip6t_%.man, $(PF6_EXT_MAN_ALL_MATCHES))
	@for ext in $(PF6_EXT_MAN_MATCHES); do \
	    echo ".SS $$ext" ;\
	    cat extensions/libip6t_$$ext.man ;\
	done >extensions/libip6t_matches.man
	@if [ -n "$(PF6_EXT_MAN_EXTRA_MATCHES)" ]; then \
	    extra=$(PF6_EXT_MAN_EXTRA_MATCHES) ;\
	    for ext in $${extra:-""}; do \
		echo ".SS $$ext (not supported, see Patch-O-Matic)" ;\
		cat extensions/libip6t_$$ext.man ;\
	    done ;\
       	fi >>extensions/libip6t_matches.man

$(DESTDIR)$(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 $< $@