Imported Upstream version 1.4.21

extensions/.gitignore

+.*.d
+.*.dd
+*.oo
+
+/GNUmakefile
+/initext.c
+/initext?.c
+/matches.man
+/targets.man

extensions/GNUmakefile.in

+# -*- Makefile -*-
+
+top_builddir = @top_builddir@
+builddir     = @builddir@
+top_srcdir   = @top_srcdir@
+srcdir       = @srcdir@
+ksourcedir   = @ksourcedir@
+prefix       = @prefix@
+exec_prefix  = @exec_prefix@
+libdir       = @libdir@
+libexecdir   = @libexecdir@
+xtlibdir     = @xtlibdir@
+
+CC                 = @CC@
+CCLD               = ${CC}
+CFLAGS             = @CFLAGS@
+CPPFLAGS           = @CPPFLAGS@
+LDFLAGS            = @LDFLAGS@
+regular_CFLAGS     = @regular_CFLAGS@
+regular_CPPFLAGS   = @regular_CPPFLAGS@
+kinclude_CPPFLAGS  = @kinclude_CPPFLAGS@
+
+AM_CFLAGS       = ${regular_CFLAGS}
+AM_CPPFLAGS     = ${regular_CPPFLAGS} -I${top_builddir}/include -I${top_builddir} -I${top_srcdir}/include ${kinclude_CPPFLAGS} ${CPPFLAGS}
+AM_DEPFLAGS     = -Wp,-MMD,$(@D)/.$(@F).d,-MT,$@
+AM_LDFLAGS      = @noundef_LDFLAGS@
+
+ifeq (${V},)
+AM_LIBTOOL_SILENT = --silent
+AM_VERBOSE_CC     = @echo "  CC      " $@;
+AM_VERBOSE_CCLD   = @echo "  CCLD    " $@;
+AM_VERBOSE_CXX    = @echo "  CXX     " $@;
+AM_VERBOSE_CXXLD  = @echo "  CXXLD   " $@;
+AM_VERBOSE_AR     = @echo "  AR      " $@;
+AM_VERBOSE_GEN    = @echo "  GEN     " $@;
+endif
+
+#
+#	Wildcard module list
+#
+pfx_build_mod := $(patsubst ${srcdir}/libxt_%.c,%,$(sort $(wildcard ${srcdir}/libxt_*.c)))
+pfx_symlinks  := NOTRACK state
+@ENABLE_IPV4_TRUE@ pf4_build_mod := $(patsubst ${srcdir}/libipt_%.c,%,$(sort $(wildcard ${srcdir}/libipt_*.c)))
+@ENABLE_IPV6_TRUE@ pf6_build_mod := $(patsubst ${srcdir}/libip6t_%.c,%,$(sort $(wildcard ${srcdir}/libip6t_*.c)))
+pfx_build_mod := $(filter-out @blacklist_modules@,${pfx_build_mod})
+pf4_build_mod := $(filter-out @blacklist_modules@,${pf4_build_mod})
+pf6_build_mod := $(filter-out @blacklist_modules@,${pf6_build_mod})
+pfx_objs      := $(patsubst %,libxt_%.o,${pfx_build_mod})
+pf4_objs      := $(patsubst %,libipt_%.o,${pf4_build_mod})
+pf6_objs      := $(patsubst %,libip6t_%.o,${pf6_build_mod})
+pfx_solibs    := $(patsubst %,libxt_%.so,${pfx_build_mod} ${pfx_symlinks})
+pf4_solibs    := $(patsubst %,libipt_%.so,${pf4_build_mod})
+pf6_solibs    := $(patsubst %,libip6t_%.so,${pf6_build_mod})
+
+
+#
+# Building blocks
+#
+targets := libext.a libext4.a libext6.a matches.man targets.man
+targets_install :=
+@ENABLE_STATIC_TRUE@ libext_objs := ${pfx_objs}
+@ENABLE_STATIC_TRUE@ libext4_objs := ${pf4_objs}
+@ENABLE_STATIC_TRUE@ libext6_objs := ${pf6_objs}
+@ENABLE_STATIC_FALSE@ targets += ${pfx_solibs} ${pf4_solibs} ${pf6_solibs}
+@ENABLE_STATIC_FALSE@ targets_install += ${pfx_solibs} ${pf4_solibs} ${pf6_solibs}
+
+.SECONDARY:
+
+.PHONY: all install clean distclean FORCE
+
+all: ${targets}
+
+install: ${targets_install}
+	@mkdir -p "${DESTDIR}${xtlibdir}";
+	if test -n "${targets_install}"; then install -pm0755 $^ "${DESTDIR}${xtlibdir}/"; fi;
+
+clean:
+	rm -f *.o *.oo *.so *.a {matches,targets}.man initext.c initext4.c initext6.c;
+	rm -f .*.d .*.dd;
+
+distclean: clean
+
+init%.o: init%.c
+	${AM_VERBOSE_CC} ${CC} ${AM_CPPFLAGS} ${AM_DEPFLAGS} ${AM_CFLAGS} -D_INIT=$*_init ${CFLAGS} -o $@ -c $<;
+
+-include .*.d
+
+
+#
+#	Shared libraries
+#
+lib%.so: lib%.oo
+	${AM_VERBOSE_CCLD} ${CCLD} ${AM_LDFLAGS} -shared ${LDFLAGS} -o $@ $< -L../libxtables/.libs -lxtables ${$*_LIBADD};
+
+lib%.oo: ${srcdir}/lib%.c
+	${AM_VERBOSE_CC} ${CC} ${AM_CPPFLAGS} ${AM_DEPFLAGS} ${AM_CFLAGS} -D_INIT=lib$*_init -DPIC -fPIC ${CFLAGS} ${$*_CFLAGADD} -o $@ -c $<;
+
+libxt_NOTRACK.so: libxt_CT.so
+	ln -fs $< $@
+libxt_state.so: libxt_conntrack.so
+	ln -fs $< $@
+
+# Need the LIBADDs in iptables/Makefile.am too for libxtables_la_LIBADD
+xt_RATEEST_LIBADD   = -lm
+xt_statistic_LIBADD = -lm
+@HAVE_LIBNETFILTER_CONNTRACK_TRUE@xt_connlabel_LIBADD = @libnetfilter_conntrack_LIBS@
+
+@HAVE_LIBNETFILTER_CONNTRACK_TRUE@xt_connlabel_CFLAGADD = @libnetfilter_conntrack_CFLAGS@
+
+#
+#	Static bits
+#
+#	If static building is disabled, libext*.a will still be generated,
+#	but will be empty. This is good since we can do with less case
+#	handling code in the Makefiles.
+#
+lib%.o: ${srcdir}/lib%.c
+	${AM_VERBOSE_CC} ${CC} ${AM_CPPFLAGS} ${AM_DEPFLAGS} ${AM_CFLAGS} -DNO_SHARED_LIBS=1 -D_INIT=lib$*_init ${CFLAGS} -o $@ -c $<;
+
+libext.a: initext.o ${libext_objs}
+	${AM_VERBOSE_AR} ${AR} crs $@ $^;
+
+libext4.a: initext4.o ${libext4_objs}
+	${AM_VERBOSE_AR} ${AR} crs $@ $^;
+
+libext6.a: initext6.o ${libext6_objs}
+	${AM_VERBOSE_AR} ${AR} crs $@ $^;
+
+initext_func  := $(addprefix xt_,${pfx_build_mod})
+initext4_func := $(addprefix ipt_,${pf4_build_mod})
+initext6_func := $(addprefix ip6t_,${pf6_build_mod})
+
+.initext.dd: FORCE
+	@echo "${initext_func}" >$@.tmp; \
+	cmp -s $@ $@.tmp || mv $@.tmp $@; \
+	rm -f $@.tmp;
+
+.initext4.dd: FORCE
+	@echo "${initext4_func}" >$@.tmp; \
+	cmp -s $@ $@.tmp || mv $@.tmp $@; \
+	rm -f $@.tmp;
+
+.initext6.dd: FORCE
+	@echo "${initext6_func}" >$@.tmp; \
+	cmp -s $@ $@.tmp || mv $@.tmp $@; \
+	rm -f $@.tmp;
+
+initext.c: .initext.dd
+	${AM_VERBOSE_GEN}
+	@( \
+	echo "" >$@; \
+	for i in ${initext_func}; do \
+		echo "extern void lib$${i}_init(void);" >>$@; \
+	done; \
+	echo "void init_extensions(void);" >>$@; \
+	echo "void init_extensions(void)" >>$@; \
+	echo "{" >>$@; \
+	for i in ${initext_func}; do \
+		echo  " ""lib$${i}_init();" >>$@; \
+	done; \
+	echo "}" >>$@; \
+	);
+
+initext4.c: .initext4.dd
+	${AM_VERBOSE_GEN}
+	@( \
+	echo "" >$@; \
+	for i in ${initext4_func}; do \
+		echo "extern void lib$${i}_init(void);" >>$@; \
+	done; \
+	echo "void init_extensions4(void);" >>$@; \
+	echo "void init_extensions4(void)" >>$@; \
+	echo "{" >>$@; \
+	for i in ${initext4_func}; do \
+		echo  " ""lib$${i}_init();" >>$@; \
+	done; \
+	echo "}" >>$@; \
+	);
+
+initext6.c: .initext6.dd
+	${AM_VERBOSE_GEN}
+	@( \
+	echo "" >$@; \
+	for i in ${initext6_func}; do \
+		echo "extern void lib$${i}_init(void);" >>$@; \
+	done; \
+	echo "void init_extensions6(void);" >>$@; \
+	echo "void init_extensions6(void)" >>$@; \
+	echo "{" >>$@; \
+	for i in ${initext6_func}; do \
+		echo " ""lib$${i}_init();" >>$@; \
+	done; \
+	echo "}" >>$@; \
+	);
+
+#
+#	Manual pages
+#
+ex_matches = $(shell echo ${1} | LC_ALL=POSIX grep -Eo '\b[[:lower:][:digit:]_]+\b')
+ex_targets = $(shell echo ${1} | LC_ALL=POSIX grep -Eo '\b[[:upper:][:digit:]_]+\b')
+man_run    = \
+	${AM_VERBOSE_GEN} \
+	for ext in $(sort ${1}); do \
+		f="${srcdir}/libxt_$$ext.man"; \
+		if [ -f "$$f" ]; then \
+			echo -e "\t+ $$f" >&2; \
+			echo ".SS $$ext"; \
+			cat "$$f" || exit $$?; \
+		fi; \
+		f="${srcdir}/libip6t_$$ext.man"; \
+		if [ -f "$$f" ]; then \
+			echo -e "\t+ $$f" >&2; \
+			echo ".SS $$ext (IPv6-specific)"; \
+			cat "$$f" || exit $$?; \
+		fi; \
+		f="${srcdir}/libipt_$$ext.man"; \
+		if [ -f "$$f" ]; then \
+			echo -e "\t+ $$f" >&2; \
+			echo ".SS $$ext (IPv4-specific)"; \
+			cat "$$f" || exit $$?; \
+		fi; \
+	done >$@;
+
+matches.man: .initext.dd .initext4.dd .initext6.dd $(wildcard ${srcdir}/lib*.man)
+	$(call man_run,$(call ex_matches,${pfx_build_mod} ${pf4_build_mod} ${pf6_build_mod} ${pfx_symlinks}))
+
+targets.man: .initext.dd .initext4.dd .initext6.dd $(wildcard ${srcdir}/lib*.man)
+	$(call man_run,$(call ex_targets,${pfx_build_mod} ${pf4_build_mod} ${pf6_build_mod} ${pfx_symlinks}))

extensions/dscp_helper.c

+/*
+ * DiffServ classname <-> DiffServ codepoint mapping functions.
+ *
+ * The latest list of the mappings can be found at:
+ * <http://www.iana.org/assignments/dscp-registry>
+ *
+ * This code is released under the GNU GPL v2, 1991
+ *
+ * Author: Iain Barnes
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <xtables.h>
+
+
+static const struct ds_class
+{
+	const char *name;
+	unsigned int dscp;
+} ds_classes[] =
+{
+	{ "CS0", 0x00 },
+	{ "CS1", 0x08 },
+	{ "CS2", 0x10 },
+	{ "CS3", 0x18 },
+	{ "CS4", 0x20 },
+	{ "CS5", 0x28 },
+	{ "CS6", 0x30 },
+	{ "CS7", 0x38 },
+	{ "BE", 0x00 },
+	{ "AF11", 0x0a },
+	{ "AF12", 0x0c },
+	{ "AF13", 0x0e },
+	{ "AF21", 0x12 },
+	{ "AF22", 0x14 },
+	{ "AF23", 0x16 },
+	{ "AF31", 0x1a },
+	{ "AF32", 0x1c },
+	{ "AF33", 0x1e },
+	{ "AF41", 0x22 },
+	{ "AF42", 0x24 },
+	{ "AF43", 0x26 },
+	{ "EF", 0x2e }
+};
+
+
+
+static unsigned int
+class_to_dscp(const char *name)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(ds_classes); i++) {
+		if (!strncasecmp(name, ds_classes[i].name,
+					strlen(ds_classes[i].name)))
+			return ds_classes[i].dscp;
+	}
+
+	xtables_error(PARAMETER_PROBLEM,
+			"Invalid DSCP value `%s'\n", name);
+}
+
+
+#if 0
+static const char *
+dscp_to_name(unsigned int dscp)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ds_classes); ++i) 
+		if (dscp == ds_classes[i].dscp)
+			return ds_classes[i].name;
+
+	xtables_error(PARAMETER_PROBLEM,
+			"Invalid DSCP value `%d'\n", dscp);
+}
+#endif
+

extensions/libip6t_DNAT.c

+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * Based on Rusty Russell's IPv4 DNAT target. Development of IPv6 NAT
+ * funded by Astaro.
+ */
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <xtables.h>
+#include <iptables.h>
+#include <limits.h> /* INT_MAX in ip_tables.h */
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/nf_nat.h>
+
+enum {
+	O_TO_DEST = 0,
+	O_RANDOM,
+	O_PERSISTENT,
+	O_X_TO_DEST,
+	F_TO_DEST   = 1 << O_TO_DEST,
+	F_RANDOM   = 1 << O_RANDOM,
+	F_X_TO_DEST = 1 << O_X_TO_DEST,
+};
+
+static void DNAT_help(void)
+{
+	printf(
+"DNAT target options:\n"
+" --to-destination [<ipaddr>[-<ipaddr>]][:port[-port]]\n"
+"				Address to map destination to.\n"
+"[--random] [--persistent]\n");
+}
+
+static const struct xt_option_entry DNAT_opts[] = {
+	{.name = "to-destination", .id = O_TO_DEST, .type = XTTYPE_STRING,
+	 .flags = XTOPT_MAND | XTOPT_MULTI},
+	{.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE},
+	{.name = "persistent", .id = O_PERSISTENT, .type = XTTYPE_NONE},
+	XTOPT_TABLEEND,
+};
+
+/* Ranges expected in network order. */
+static void
+parse_to(const char *orig_arg, int portok, struct nf_nat_range *range)
+{
+	char *arg, *start, *end = NULL, *colon = NULL, *dash, *error;
+	const struct in6_addr *ip;
+
+	arg = strdup(orig_arg);
+	if (arg == NULL)
+		xtables_error(RESOURCE_PROBLEM, "strdup");
+
+	start = strchr(arg, '[');
+	if (start == NULL) {
+		start = arg;
+		/* Lets assume one colon is port information. Otherwise its an IPv6 address */
+		colon = strchr(arg, ':');
+		if (colon && strchr(colon+1, ':'))
+			colon = NULL;
+	}
+	else {
+		start++;
+		end = strchr(start, ']');
+		if (end == NULL)
+			xtables_error(PARAMETER_PROBLEM,
+				      "Invalid address format");
+
+		*end = '\0';
+		colon = strchr(end + 1, ':');
+	}
+
+	if (colon) {
+		int port;
+
+		if (!portok)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Need TCP, UDP, SCTP or DCCP with port specification");
+
+		range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+
+		port = atoi(colon+1);
+		if (port <= 0 || port > 65535)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Port `%s' not valid\n", colon+1);
+
+		error = strchr(colon+1, ':');
+		if (error)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Invalid port:port syntax - use dash\n");
+
+		dash = strchr(colon, '-');
+		if (!dash) {
+			range->min_proto.tcp.port
+				= range->max_proto.tcp.port
+				= htons(port);
+		} else {
+			int maxport;
+
+			maxport = atoi(dash + 1);
+			if (maxport <= 0 || maxport > 65535)
+				xtables_error(PARAMETER_PROBLEM,
+					   "Port `%s' not valid\n", dash+1);
+			if (maxport < port)
+				/* People are stupid. */
+				xtables_error(PARAMETER_PROBLEM,
+					   "Port range `%s' funky\n", colon+1);
+			range->min_proto.tcp.port = htons(port);
+			range->max_proto.tcp.port = htons(maxport);
+		}
+		/* Starts with colon or [] colon? No IP info...*/
+		if (colon == arg || colon == arg+2) {
+			free(arg);
+			return;
+		}
+		*colon = '\0';
+	}
+
+	range->flags |= NF_NAT_RANGE_MAP_IPS;
+	dash = strchr(start, '-');
+	if (colon && dash && dash > colon)
+		dash = NULL;
+
+	if (dash)
+		*dash = '\0';
+
+	ip = xtables_numeric_to_ip6addr(start);
+	if (!ip)
+		xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n",
+			      start);
+	range->min_addr.in6 = *ip;
+	if (dash) {
+		ip = xtables_numeric_to_ip6addr(dash + 1);
+		if (!ip)
+			xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n",
+				      dash+1);
+		range->max_addr.in6 = *ip;
+	} else
+		range->max_addr = range->min_addr;
+
+	free(arg);
+	return;
+}
+
+static void DNAT_parse(struct xt_option_call *cb)
+{
+	const struct ip6t_entry *entry = cb->xt_entry;
+	struct nf_nat_range *range = cb->data;
+	int portok;
+
+	if (entry->ipv6.proto == IPPROTO_TCP ||
+	    entry->ipv6.proto == IPPROTO_UDP ||
+	    entry->ipv6.proto == IPPROTO_SCTP ||
+	    entry->ipv6.proto == IPPROTO_DCCP ||
+	    entry->ipv6.proto == IPPROTO_ICMP)
+		portok = 1;
+	else
+		portok = 0;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_TO_DEST:
+		if (cb->xflags & F_X_TO_DEST) {
+			if (!kernel_version)
+				get_kernel_version();
+			if (kernel_version > LINUX_VERSION(2, 6, 10))
+				xtables_error(PARAMETER_PROBLEM,
+					   "DNAT: Multiple --to-destination not supported");
+		}
+		parse_to(cb->arg, portok, range);
+		break;
+	case O_PERSISTENT:
+		range->flags |= NF_NAT_RANGE_PERSISTENT;
+		break;
+	}
+}
+
+static void DNAT_fcheck(struct xt_fcheck_call *cb)
+{
+	static const unsigned int f = F_TO_DEST | F_RANDOM;
+	struct nf_nat_range *mr = cb->data;
+
+	if ((cb->xflags & f) == f)
+		mr->flags |= NF_NAT_RANGE_PROTO_RANDOM;
+}
+
+static void print_range(const struct nf_nat_range *range)
+{
+	if (range->flags & NF_NAT_RANGE_MAP_IPS) {
+		if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)
+			printf("[");
+		printf("%s", xtables_ip6addr_to_numeric(&range->min_addr.in6));
+		if (memcmp(&range->min_addr, &range->max_addr,
+			   sizeof(range->min_addr)))
+			printf("-%s", xtables_ip6addr_to_numeric(&range->max_addr.in6));
+		if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)
+			printf("]");
+	}
+	if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
+		printf(":");
+		printf("%hu", ntohs(range->min_proto.tcp.port));
+		if (range->max_proto.tcp.port != range->min_proto.tcp.port)
+			printf("-%hu", ntohs(range->max_proto.tcp.port));
+	}
+}
+
+static void DNAT_print(const void *ip, const struct xt_entry_target *target,
+                       int numeric)
+{
+	const struct nf_nat_range *range = (const void *)target->data;
+
+	printf(" to:");
+	print_range(range);
+	if (range->flags & NF_NAT_RANGE_PROTO_RANDOM)
+		printf(" random");
+	if (range->flags & NF_NAT_RANGE_PERSISTENT)
+		printf(" persistent");
+}
+
+static void DNAT_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct nf_nat_range *range = (const void *)target->data;
+
+	printf(" --to-destination ");
+	print_range(range);
+	if (range->flags & NF_NAT_RANGE_PROTO_RANDOM)
+		printf(" --random");
+	if (range->flags & NF_NAT_RANGE_PERSISTENT)
+		printf(" --persistent");
+}
+
+static struct xtables_target snat_tg_reg = {
+	.name		= "DNAT",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.revision	= 1,
+	.size		= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.userspacesize	= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.help		= DNAT_help,
+	.x6_parse	= DNAT_parse,
+	.x6_fcheck	= DNAT_fcheck,
+	.print		= DNAT_print,
+	.save		= DNAT_save,
+	.x6_options	= DNAT_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&snat_tg_reg);
+}

extensions/libip6t_DNPT.c

+/*
+ * Copyright (c) 2012-2013 Patrick McHardy <kaber@trash.net>
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <xtables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_NPT.h>
+
+enum {
+	O_SRC_PFX	= 1 << 0,
+	O_DST_PFX	= 1 << 1,
+};
+
+static const struct xt_option_entry DNPT_options[] = {
+	{ .name = "src-pfx", .id = O_SRC_PFX, .type = XTTYPE_HOSTMASK,
+	  .flags = XTOPT_MAND },
+	{ .name = "dst-pfx", .id = O_DST_PFX, .type = XTTYPE_HOSTMASK,
+	  .flags = XTOPT_MAND },
+	{ }
+};
+
+static void DNPT_help(void)
+{
+	printf("DNPT target options:"
+	       "\n"
+	       " --src-pfx prefix/length\n"
+	       " --dst-pfx prefix/length\n"
+	       "\n");
+}
+
+static void DNPT_parse(struct xt_option_call *cb)
+{
+	struct ip6t_npt_tginfo *npt = cb->data;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_SRC_PFX:
+		npt->src_pfx = cb->val.haddr;
+		npt->src_pfx_len = cb->val.hlen;
+		break;
+	case O_DST_PFX:
+		npt->dst_pfx = cb->val.haddr;
+		npt->dst_pfx_len = cb->val.hlen;
+		break;
+	}
+}
+
+static void DNPT_print(const void *ip, const struct xt_entry_target *target,
+		       int numeric)
+{
+	const struct ip6t_npt_tginfo *npt = (const void *)target->data;
+
+	printf("src-pfx %s/%u ", xtables_ip6addr_to_numeric(&npt->src_pfx.in6),
+				 npt->src_pfx_len);
+	printf("dst-pfx %s/%u ", xtables_ip6addr_to_numeric(&npt->dst_pfx.in6),
+				 npt->dst_pfx_len);
+}
+
+static void DNPT_save(const void *ip, const struct xt_entry_target *target)
+{
+	static const struct in6_addr zero_addr;
+	const struct ip6t_npt_tginfo *info = (const void *)target->data;
+
+	if (memcmp(&info->src_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
+	    info->src_pfx_len != 0)
+		printf("--src-pfx %s/%u ",
+		       xtables_ip6addr_to_numeric(&info->src_pfx.in6),
+		       info->src_pfx_len);
+	if (memcmp(&info->dst_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
+	    info->dst_pfx_len != 0)
+		printf("--dst-pfx %s/%u ",
+		       xtables_ip6addr_to_numeric(&info->dst_pfx.in6),
+		       info->dst_pfx_len);
+}
+
+static struct xtables_target snpt_tg_reg = {
+	.name		= "DNPT",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.size		= XT_ALIGN(sizeof(struct ip6t_npt_tginfo)),
+	.userspacesize	= offsetof(struct ip6t_npt_tginfo, adjustment),
+	.help		= DNPT_help,
+	.x6_parse	= DNPT_parse,
+	.print		= DNPT_print,
+	.save		= DNPT_save,
+	.x6_options	= DNPT_options,
+};
+
+void _init(void)
+{
+	xtables_register_target(&snpt_tg_reg);
+}

extensions/libip6t_DNPT.man

+Provides stateless destination IPv6-to-IPv6 Network Prefix Translation (as
+described by RFC 6296).
+.PP
+You have to use this target in the
+.B mangle
+table, not in the
+.B nat
+table. It takes the following options:
+.TP
+\fB\-\-src\-pfx\fP [\fIprefix/\fP\fIlength]
+Set source prefix that you want to translate and length
+.TP
+\fB\-\-dst\-pfx\fP [\fIprefix/\fP\fIlength]
+Set destination prefix that you want to use in the translation and length
+.PP
+You have to use the SNPT target to undo the translation. Example:
+.IP
+ip6tables \-t mangle \-I POSTROUTING \-s fd00::/64 \! \-o vboxnet0
+\-j SNPT \-\-src-pfx fd00::/64 \-\-dst-pfx 2001:e20:2000:40f::/64
+.IP
+ip6tables \-t mangle \-I PREROUTING \-i wlan0 \-d 2001:e20:2000:40f::/64
+\-j DNPT \-\-src-pfx 2001:e20:2000:40f::/64 \-\-dst-pfx fd00::/64
+.PP
+You may need to enable IPv6 neighbor proxy:
+.IP
+sysctl -w net.ipv6.conf.all.proxy_ndp=1
+.PP
+You also have to use the
+.B NOTRACK
+target to disable connection tracking for translated flows.

extensions/libip6t_HL.c

+/*
+ * IPv6 Hop Limit Target module
+ * Maciej Soltysiak <solt@dns.toxicfilms.tv>
+ * Based on HW's ttl target
+ * This program is distributed under the terms of GNU GPL
+ */
+#include <stdio.h>
+#include <xtables.h>
+#include <linux/netfilter_ipv6/ip6t_HL.h>
+
+enum {
+	O_HL_SET = 0,
+	O_HL_INC,
+	O_HL_DEC,
+	F_HL_SET = 1 << O_HL_SET,
+	F_HL_INC = 1 << O_HL_INC,
+	F_HL_DEC = 1 << O_HL_DEC,
+	F_ANY    = F_HL_SET | F_HL_INC | F_HL_DEC,
+};
+
+#define s struct ip6t_HL_info
+static const struct xt_option_entry HL_opts[] = {
+	{.name = "hl-set", .type = XTTYPE_UINT8, .id = O_HL_SET,
+	 .excl = F_ANY, .flags = XTOPT_PUT, XTOPT_POINTER(s, hop_limit)},
+	{.name = "hl-dec", .type = XTTYPE_UINT8, .id = O_HL_DEC,
+	 .excl = F_ANY, .flags = XTOPT_PUT, XTOPT_POINTER(s, hop_limit),
+	 .min = 1},
+	{.name = "hl-inc", .type = XTTYPE_UINT8, .id = O_HL_INC,
+	 .excl = F_ANY, .flags = XTOPT_PUT, XTOPT_POINTER(s, hop_limit),
+	 .min = 1},
+	XTOPT_TABLEEND,
+};
+#undef s
+
+static void HL_help(void)
+{
+	printf(
+"HL target options\n"
+"  --hl-set value		Set HL to <value 0-255>\n"
+"  --hl-dec value		Decrement HL by <value 1-255>\n"
+"  --hl-inc value		Increment HL by <value 1-255>\n");
+}
+
+static void HL_parse(struct xt_option_call *cb)
+{
+	struct ip6t_HL_info *info = cb->data;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_HL_SET:
+		info->mode = IP6T_HL_SET;
+		break;
+	case O_HL_INC:
+		info->mode = IP6T_HL_INC;
+		break;
+	case O_HL_DEC:
+		info->mode = IP6T_HL_DEC;
+		break;
+	}
+}
+
+static void HL_check(struct xt_fcheck_call *cb)
+{
+	if (!(cb->xflags & F_ANY))
+		xtables_error(PARAMETER_PROBLEM,
+				"HL: You must specify an action");
+}
+
+static void HL_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct ip6t_HL_info *info = 
+		(struct ip6t_HL_info *) target->data;
+
+	switch (info->mode) {
+		case IP6T_HL_SET:
+			printf(" --hl-set");
+			break;
+		case IP6T_HL_DEC:
+			printf(" --hl-dec");
+			break;
+
+		case IP6T_HL_INC:
+			printf(" --hl-inc");
+			break;
+	}
+	printf(" %u", info->hop_limit);
+}
+
+static void HL_print(const void *ip, const struct xt_entry_target *target,
+                     int numeric)
+{
+	const struct ip6t_HL_info *info =
+		(struct ip6t_HL_info *) target->data;
+
+	printf(" HL ");
+	switch (info->mode) {
+		case IP6T_HL_SET:
+			printf("set to");
+			break;
+		case IP6T_HL_DEC:
+			printf("decrement by");
+			break;
+		case IP6T_HL_INC:
+			printf("increment by");
+			break;
+	}
+	printf(" %u", info->hop_limit);
+}
+
+static struct xtables_target hl_tg6_reg = {
+	.name 		= "HL",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.size		= XT_ALIGN(sizeof(struct ip6t_HL_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct ip6t_HL_info)),
+	.help		= HL_help,
+	.print		= HL_print,
+	.save		= HL_save,
+	.x6_parse	= HL_parse,
+	.x6_fcheck	= HL_check,
+	.x6_options	= HL_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&hl_tg6_reg);
+}

extensions/libip6t_HL.man

+This is used to modify the Hop Limit field in IPv6 header. The Hop Limit field
+is similar to what is known as TTL value in IPv4.  Setting or incrementing the
+Hop Limit field can potentially be very dangerous, so it should be avoided at
+any cost. This target is only valid in
+.B mangle
+table.
+.PP
+.B Don't ever set or increment the value on packets that leave your local network!
+.TP
+\fB\-\-hl\-set\fP \fIvalue\fP
+Set the Hop Limit to `value'.
+.TP
+\fB\-\-hl\-dec\fP \fIvalue\fP
+Decrement the Hop Limit `value' times.
+.TP
+\fB\-\-hl\-inc\fP \fIvalue\fP
+Increment the Hop Limit `value' times.

extensions/libip6t_LOG.c

+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include <xtables.h>
+#include <linux/netfilter_ipv6/ip6t_LOG.h>
+
+#ifndef IP6T_LOG_UID	/* Old kernel */
+#define IP6T_LOG_UID	0x08
+#undef  IP6T_LOG_MASK
+#define IP6T_LOG_MASK	0x0f
+#endif
+
+#define LOG_DEFAULT_LEVEL LOG_WARNING
+
+enum {
+	O_LOG_LEVEL = 0,
+	O_LOG_PREFIX,
+	O_LOG_TCPSEQ,
+	O_LOG_TCPOPTS,
+	O_LOG_IPOPTS,
+	O_LOG_UID,
+	O_LOG_MAC,
+};
+
+static void LOG_help(void)
+{
+	printf(
+"LOG target options:\n"
+" --log-level level		Level of logging (numeric or see syslog.conf)\n"
+" --log-prefix prefix		Prefix log messages with this prefix.\n"
+" --log-tcp-sequence		Log TCP sequence numbers.\n"
+" --log-tcp-options		Log TCP options.\n"
+" --log-ip-options		Log IP options.\n"
+" --log-uid			Log UID owning the local socket.\n"
+" --log-macdecode		Decode MAC addresses and protocol.\n");
+}
+
+#define s struct ip6t_log_info
+static const struct xt_option_entry LOG_opts[] = {
+	{.name = "log-level", .id = O_LOG_LEVEL, .type = XTTYPE_SYSLOGLEVEL,
+	 .flags = XTOPT_PUT, XTOPT_POINTER(s, level)},
+	{.name = "log-prefix", .id = O_LOG_PREFIX, .type = XTTYPE_STRING,
+	 .flags = XTOPT_PUT, XTOPT_POINTER(s, prefix), .min = 1},
+	{.name = "log-tcp-sequence", .id = O_LOG_TCPSEQ, .type = XTTYPE_NONE},
+	{.name = "log-tcp-options", .id = O_LOG_TCPOPTS, .type = XTTYPE_NONE},
+	{.name = "log-ip-options", .id = O_LOG_IPOPTS, .type = XTTYPE_NONE},
+	{.name = "log-uid", .id = O_LOG_UID, .type = XTTYPE_NONE},
+	{.name = "log-macdecode", .id = O_LOG_MAC, .type = XTTYPE_NONE},
+	XTOPT_TABLEEND,
+};
+#undef s
+
+static void LOG_init(struct xt_entry_target *t)
+{
+	struct ip6t_log_info *loginfo = (struct ip6t_log_info *)t->data;
+
+	loginfo->level = LOG_DEFAULT_LEVEL;
+
+}
+
+struct ip6t_log_names {
+	const char *name;
+	unsigned int level;
+};
+
+static const struct ip6t_log_names ip6t_log_names[]
+= { { .name = "alert",   .level = LOG_ALERT },
+    { .name = "crit",    .level = LOG_CRIT },
+    { .name = "debug",   .level = LOG_DEBUG },
+    { .name = "emerg",   .level = LOG_EMERG },
+    { .name = "error",   .level = LOG_ERR },		/* DEPRECATED */
+    { .name = "info",    .level = LOG_INFO },
+    { .name = "notice",  .level = LOG_NOTICE },
+    { .name = "panic",   .level = LOG_EMERG },		/* DEPRECATED */
+    { .name = "warning", .level = LOG_WARNING }
+};
+
+static void LOG_parse(struct xt_option_call *cb)
+{
+	struct ip6t_log_info *info = cb->data;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_LOG_PREFIX:
+		if (strchr(cb->arg, '\n') != NULL)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Newlines not allowed in --log-prefix");
+		break;
+	case O_LOG_TCPSEQ:
+		info->logflags |= IP6T_LOG_TCPSEQ;
+		break;
+	case O_LOG_TCPOPTS:
+		info->logflags |= IP6T_LOG_TCPOPT;
+		break;
+	case O_LOG_IPOPTS:
+		info->logflags |= IP6T_LOG_IPOPT;
+		break;
+	case O_LOG_UID:
+		info->logflags |= IP6T_LOG_UID;
+		break;
+	case O_LOG_MAC:
+		info->logflags |= IP6T_LOG_MACDECODE;
+		break;
+	}
+}
+
+static void LOG_print(const void *ip, const struct xt_entry_target *target,
+                      int numeric)
+{
+	const struct ip6t_log_info *loginfo
+		= (const struct ip6t_log_info *)target->data;
+	unsigned int i = 0;
+
+	printf(" LOG");
+	if (numeric)
+		printf(" flags %u level %u",
+		       loginfo->logflags, loginfo->level);
+	else {
+		for (i = 0; i < ARRAY_SIZE(ip6t_log_names); ++i)
+			if (loginfo->level == ip6t_log_names[i].level) {
+				printf(" level %s", ip6t_log_names[i].name);
+				break;
+			}
+		if (i == ARRAY_SIZE(ip6t_log_names))
+			printf(" UNKNOWN level %u", loginfo->level);
+		if (loginfo->logflags & IP6T_LOG_TCPSEQ)
+			printf(" tcp-sequence");
+		if (loginfo->logflags & IP6T_LOG_TCPOPT)
+			printf(" tcp-options");
+		if (loginfo->logflags & IP6T_LOG_IPOPT)
+			printf(" ip-options");
+		if (loginfo->logflags & IP6T_LOG_UID)
+			printf(" uid");
+		if (loginfo->logflags & IP6T_LOG_MACDECODE)
+			printf(" macdecode");
+		if (loginfo->logflags & ~(IP6T_LOG_MASK))
+			printf(" unknown-flags");
+	}
+
+	if (strcmp(loginfo->prefix, "") != 0)
+		printf(" prefix \"%s\"", loginfo->prefix);
+}
+
+static void LOG_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct ip6t_log_info *loginfo
+		= (const struct ip6t_log_info *)target->data;
+
+	if (strcmp(loginfo->prefix, "") != 0) {
+		printf(" --log-prefix");
+		xtables_save_string(loginfo->prefix);
+	}
+
+	if (loginfo->level != LOG_DEFAULT_LEVEL)
+		printf(" --log-level %d", loginfo->level);
+
+	if (loginfo->logflags & IP6T_LOG_TCPSEQ)
+		printf(" --log-tcp-sequence");
+	if (loginfo->logflags & IP6T_LOG_TCPOPT)
+		printf(" --log-tcp-options");
+	if (loginfo->logflags & IP6T_LOG_IPOPT)
+		printf(" --log-ip-options");
+	if (loginfo->logflags & IP6T_LOG_UID)
+		printf(" --log-uid");
+	if (loginfo->logflags & IP6T_LOG_MACDECODE)
+		printf(" --log-macdecode");
+}
+
+static struct xtables_target log_tg6_reg = {
+	.name          = "LOG",
+	.version       = XTABLES_VERSION,
+	.family        = NFPROTO_IPV6,
+	.size          = XT_ALIGN(sizeof(struct ip6t_log_info)),
+	.userspacesize = XT_ALIGN(sizeof(struct ip6t_log_info)),
+	.help          = LOG_help,
+	.init          = LOG_init,
+	.print         = LOG_print,
+	.save          = LOG_save,
+	.x6_parse      = LOG_parse,
+	.x6_options    = LOG_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&log_tg6_reg);
+}

extensions/libip6t_MASQUERADE.c

+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * Based on Rusty Russell's IPv4 MASQUERADE target. Development of IPv6 NAT
+ * funded by Astaro.
+ */
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <xtables.h>
+#include <limits.h> /* INT_MAX in ip_tables.h */
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/nf_nat.h>
+
+enum {
+	O_TO_PORTS = 0,
+	O_RANDOM,
+};
+
+static void MASQUERADE_help(void)
+{
+	printf(
+"MASQUERADE target options:\n"
+" --to-ports <port>[-<port>]\n"
+"				Port (range) to map to.\n"
+" --random\n"
+"				Randomize source port.\n");
+}
+
+static const struct xt_option_entry MASQUERADE_opts[] = {
+	{.name = "to-ports", .id = O_TO_PORTS, .type = XTTYPE_STRING},
+	{.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE},
+	XTOPT_TABLEEND,
+};
+
+/* Parses ports */
+static void
+parse_ports(const char *arg, struct nf_nat_range *r)
+{
+	char *end;
+	unsigned int port, maxport;
+
+	r->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+
+	if (!xtables_strtoui(arg, &end, &port, 0, UINT16_MAX))
+		xtables_param_act(XTF_BAD_VALUE, "MASQUERADE", "--to-ports", arg);
+
+	switch (*end) {
+	case '\0':
+		r->min_proto.tcp.port
+			= r->max_proto.tcp.port
+			= htons(port);
+		return;
+	case '-':
+		if (!xtables_strtoui(end + 1, NULL, &maxport, 0, UINT16_MAX))
+			break;
+
+		if (maxport < port)
+			break;
+
+		r->min_proto.tcp.port = htons(port);
+		r->max_proto.tcp.port = htons(maxport);
+		return;
+	default:
+		break;
+	}
+	xtables_param_act(XTF_BAD_VALUE, "MASQUERADE", "--to-ports", arg);
+}
+
+static void MASQUERADE_parse(struct xt_option_call *cb)
+{
+	const struct ip6t_entry *entry = cb->xt_entry;
+	struct nf_nat_range *r = cb->data;
+	int portok;
+
+	if (entry->ipv6.proto == IPPROTO_TCP ||
+	    entry->ipv6.proto == IPPROTO_UDP ||
+	    entry->ipv6.proto == IPPROTO_SCTP ||
+	    entry->ipv6.proto == IPPROTO_DCCP ||
+	    entry->ipv6.proto == IPPROTO_ICMP)
+		portok = 1;
+	else
+		portok = 0;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_TO_PORTS:
+		if (!portok)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Need TCP, UDP, SCTP or DCCP with port specification");
+		parse_ports(cb->arg, r);
+		break;
+	case O_RANDOM:
+		r->flags |=  NF_NAT_RANGE_PROTO_RANDOM;
+		break;
+	}
+}
+
+static void
+MASQUERADE_print(const void *ip, const struct xt_entry_target *target,
+                 int numeric)
+{
+	const struct nf_nat_range *r = (const void *)target->data;
+
+	if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
+		printf(" masq ports: ");
+		printf("%hu", ntohs(r->min_proto.tcp.port));
+		if (r->max_proto.tcp.port != r->min_proto.tcp.port)
+			printf("-%hu", ntohs(r->max_proto.tcp.port));
+	}
+
+	if (r->flags & NF_NAT_RANGE_PROTO_RANDOM)
+		printf(" random");
+}
+
+static void
+MASQUERADE_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct nf_nat_range *r = (const void *)target->data;
+
+	if (r->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
+		printf(" --to-ports %hu", ntohs(r->min_proto.tcp.port));
+		if (r->max_proto.tcp.port != r->min_proto.tcp.port)
+			printf("-%hu", ntohs(r->max_proto.tcp.port));
+	}
+
+	if (r->flags & NF_NAT_RANGE_PROTO_RANDOM)
+		printf(" --random");
+}
+
+static struct xtables_target masquerade_tg_reg = {
+	.name		= "MASQUERADE",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.size		= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.userspacesize	= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.help		= MASQUERADE_help,
+	.x6_parse	= MASQUERADE_parse,
+	.print		= MASQUERADE_print,
+	.save		= MASQUERADE_save,
+	.x6_options	= MASQUERADE_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&masquerade_tg_reg);
+}

extensions/libip6t_NETMAP.c

+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * Based on Svenning Soerensen's IPv4 NETMAP target. Development of IPv6 NAT
+ * funded by Astaro.
+ */
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <xtables.h>
+#include <libiptc/libip6tc.h>
+#include <linux/netfilter/nf_nat.h>
+
+#define MODULENAME "NETMAP"
+
+enum {
+	O_TO = 0,
+};
+
+static const struct xt_option_entry NETMAP_opts[] = {
+	{.name = "to", .id = O_TO, .type = XTTYPE_HOSTMASK,
+	 .flags = XTOPT_MAND},
+	XTOPT_TABLEEND,
+};
+
+static void NETMAP_help(void)
+{
+	printf(MODULENAME" target options:\n"
+	       "  --%s address[/mask]\n"
+	       "				Network address to map to.\n\n",
+	       NETMAP_opts[0].name);
+}
+
+static void NETMAP_parse(struct xt_option_call *cb)
+{
+	struct nf_nat_range *range = cb->data;
+	unsigned int i;
+
+	xtables_option_parse(cb);
+	range->flags |= NF_NAT_RANGE_MAP_IPS;
+	for (i = 0; i < 4; i++) {
+		range->min_addr.ip6[i] = cb->val.haddr.ip6[i] &
+					 cb->val.hmask.ip6[i];
+		range->max_addr.ip6[i] = range->min_addr.ip6[i] |
+					 ~cb->val.hmask.ip6[i];
+	}
+}
+
+static void NETMAP_print(const void *ip, const struct xt_entry_target *target,
+                         int numeric)
+{
+	const struct nf_nat_range *r = (const void *)target->data;
+	struct in6_addr a;
+	unsigned int i;
+	int bits;
+
+	a = r->min_addr.in6;
+	printf("%s", xtables_ip6addr_to_numeric(&a));
+	for (i = 0; i < 4; i++)
+		a.s6_addr32[i] = ~(r->min_addr.ip6[i] ^ r->max_addr.ip6[i]);
+	bits = xtables_ip6mask_to_cidr(&a);
+	if (bits < 0)
+		printf("/%s", xtables_ip6addr_to_numeric(&a));
+	else
+		printf("/%d", bits);
+}
+
+static void NETMAP_save(const void *ip, const struct xt_entry_target *target)
+{
+	printf(" --%s ", NETMAP_opts[0].name);
+	NETMAP_print(ip, target, 0);
+}
+
+static struct xtables_target netmap_tg_reg = {
+	.name		= MODULENAME,
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.size		= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.userspacesize	= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.help		= NETMAP_help,
+	.x6_parse	= NETMAP_parse,
+	.print		= NETMAP_print,
+	.save		= NETMAP_save,
+	.x6_options	= NETMAP_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&netmap_tg_reg);
+}

extensions/libip6t_REDIRECT.c

+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * Based on Rusty Russell's IPv4 REDIRECT target. Development of IPv6 NAT
+ * funded by Astaro.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <xtables.h>
+#include <limits.h> /* INT_MAX in ip_tables.h */
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/nf_nat.h>
+
+enum {
+	O_TO_PORTS = 0,
+	O_RANDOM,
+	F_TO_PORTS = 1 << O_TO_PORTS,
+	F_RANDOM   = 1 << O_RANDOM,
+};
+
+static void REDIRECT_help(void)
+{
+	printf(
+"REDIRECT target options:\n"
+" --to-ports <port>[-<port>]\n"
+"				Port (range) to map to.\n"
+" [--random]\n");
+}
+
+static const struct xt_option_entry REDIRECT_opts[] = {
+	{.name = "to-ports", .id = O_TO_PORTS, .type = XTTYPE_STRING},
+	{.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE},
+	XTOPT_TABLEEND,
+};
+
+/* Parses ports */
+static void
+parse_ports(const char *arg, struct nf_nat_range *range)
+{
+	char *end = "";
+	unsigned int port, maxport;
+
+	range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+
+	if (!xtables_strtoui(arg, &end, &port, 0, UINT16_MAX) &&
+	    (port = xtables_service_to_port(arg, NULL)) == (unsigned)-1)
+		xtables_param_act(XTF_BAD_VALUE, "REDIRECT", "--to-ports", arg);
+
+	switch (*end) {
+	case '\0':
+		range->min_proto.tcp.port
+			= range->max_proto.tcp.port
+			= htons(port);
+		return;
+	case '-':
+		if (!xtables_strtoui(end + 1, NULL, &maxport, 0, UINT16_MAX) &&
+		    (maxport = xtables_service_to_port(end + 1, NULL)) == (unsigned)-1)
+			break;
+
+		if (maxport < port)
+			break;
+
+		range->min_proto.tcp.port = htons(port);
+		range->max_proto.tcp.port = htons(maxport);
+		return;
+	default:
+		break;
+	}
+	xtables_param_act(XTF_BAD_VALUE, "REDIRECT", "--to-ports", arg);
+}
+
+static void REDIRECT_parse(struct xt_option_call *cb)
+{
+	const struct ip6t_entry *entry = cb->xt_entry;
+	struct nf_nat_range *range = (void *)(*cb->target)->data;
+	int portok;
+
+	if (entry->ipv6.proto == IPPROTO_TCP
+	    || entry->ipv6.proto == IPPROTO_UDP
+	    || entry->ipv6.proto == IPPROTO_SCTP
+	    || entry->ipv6.proto == IPPROTO_DCCP
+	    || entry->ipv6.proto == IPPROTO_ICMP)
+		portok = 1;
+	else
+		portok = 0;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_TO_PORTS:
+		if (!portok)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Need TCP, UDP, SCTP or DCCP with port specification");
+		parse_ports(cb->arg, range);
+		if (cb->xflags & F_RANDOM)
+			range->flags |= NF_NAT_RANGE_PROTO_RANDOM;
+		break;
+	case O_RANDOM:
+		if (cb->xflags & F_TO_PORTS)
+			range->flags |= NF_NAT_RANGE_PROTO_RANDOM;
+		break;
+	}
+}
+
+static void REDIRECT_print(const void *ip, const struct xt_entry_target *target,
+                           int numeric)
+{
+	const struct nf_nat_range *range = (const void *)target->data;
+
+	if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
+		printf(" redir ports ");
+		printf("%hu", ntohs(range->min_proto.tcp.port));
+		if (range->max_proto.tcp.port != range->min_proto.tcp.port)
+			printf("-%hu", ntohs(range->max_proto.tcp.port));
+		if (range->flags & NF_NAT_RANGE_PROTO_RANDOM)
+			printf(" random");
+	}
+}
+
+static void REDIRECT_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct nf_nat_range *range = (const void *)target->data;
+
+	if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
+		printf(" --to-ports ");
+		printf("%hu", ntohs(range->min_proto.tcp.port));
+		if (range->max_proto.tcp.port != range->min_proto.tcp.port)
+			printf("-%hu", ntohs(range->max_proto.tcp.port));
+		if (range->flags & NF_NAT_RANGE_PROTO_RANDOM)
+			printf(" --random");
+	}
+}
+
+static struct xtables_target redirect_tg_reg = {
+	.name		= "REDIRECT",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.size		= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.userspacesize	= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.help		= REDIRECT_help,
+	.x6_parse	= REDIRECT_parse,
+	.print		= REDIRECT_print,
+	.save		= REDIRECT_save,
+	.x6_options	= REDIRECT_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&redirect_tg_reg);
+}

extensions/libip6t_REJECT.c

+/* Shared library add-on to ip6tables to add customized REJECT support.
+ *
+ * (C) 2000 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
+ * 
+ * ported to IPv6 by Harald Welte <laforge@gnumonks.org>
+ *
+ */
+#include <stdio.h>
+#include <string.h>
+#include <xtables.h>
+#include <linux/netfilter_ipv6/ip6t_REJECT.h>
+
+struct reject_names {
+	const char *name;
+	const char *alias;
+	enum ip6t_reject_with with;
+	const char *desc;
+};
+
+enum {
+	O_REJECT_WITH = 0,
+};
+
+static const struct reject_names reject_table[] = {
+	{"icmp6-no-route", "no-route",
+		IP6T_ICMP6_NO_ROUTE, "ICMPv6 no route"},
+	{"icmp6-adm-prohibited", "adm-prohibited",
+		IP6T_ICMP6_ADM_PROHIBITED, "ICMPv6 administratively prohibited"},
+#if 0
+	{"icmp6-not-neighbor", "not-neighbor"},
+		IP6T_ICMP6_NOT_NEIGHBOR, "ICMPv6 not a neighbor"},
+#endif
+	{"icmp6-addr-unreachable", "addr-unreach",
+		IP6T_ICMP6_ADDR_UNREACH, "ICMPv6 address unreachable"},
+	{"icmp6-port-unreachable", "port-unreach",
+		IP6T_ICMP6_PORT_UNREACH, "ICMPv6 port unreachable"},
+	{"tcp-reset", "tcp-reset",
+		IP6T_TCP_RESET, "TCP RST packet"}
+};
+
+static void
+print_reject_types(void)
+{
+	unsigned int i;
+
+	printf("Valid reject types:\n");
+
+	for (i = 0; i < ARRAY_SIZE(reject_table); ++i) {
+		printf("    %-25s\t%s\n", reject_table[i].name, reject_table[i].desc);
+		printf("    %-25s\talias\n", reject_table[i].alias);
+	}
+	printf("\n");
+}
+
+static void REJECT_help(void)
+{
+	printf(
+"REJECT target options:\n"
+"--reject-with type              drop input packet and send back\n"
+"                                a reply packet according to type:\n");
+
+	print_reject_types();
+}
+
+static const struct xt_option_entry REJECT_opts[] = {
+	{.name = "reject-with", .id = O_REJECT_WITH, .type = XTTYPE_STRING},
+	XTOPT_TABLEEND,
+};
+
+static void REJECT_init(struct xt_entry_target *t)
+{
+	struct ip6t_reject_info *reject = (struct ip6t_reject_info *)t->data;
+
+	/* default */
+	reject->with = IP6T_ICMP6_PORT_UNREACH;
+
+}
+
+static void REJECT_parse(struct xt_option_call *cb)
+{
+	struct ip6t_reject_info *reject = cb->data;
+	unsigned int i;
+
+	xtables_option_parse(cb);
+	for (i = 0; i < ARRAY_SIZE(reject_table); ++i)
+		if (strncasecmp(reject_table[i].name,
+		      cb->arg, strlen(cb->arg)) == 0 ||
+		    strncasecmp(reject_table[i].alias,
+		      cb->arg, strlen(cb->arg)) == 0) {
+			reject->with = reject_table[i].with;
+			return;
+		}
+	xtables_error(PARAMETER_PROBLEM,
+		"unknown reject type \"%s\"", cb->arg);
+}
+
+static void REJECT_print(const void *ip, const struct xt_entry_target *target,
+                         int numeric)
+{
+	const struct ip6t_reject_info *reject
+		= (const struct ip6t_reject_info *)target->data;
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(reject_table); ++i)
+		if (reject_table[i].with == reject->with)
+			break;
+	printf(" reject-with %s", reject_table[i].name);
+}
+
+static void REJECT_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct ip6t_reject_info *reject
+		= (const struct ip6t_reject_info *)target->data;
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(reject_table); ++i)
+		if (reject_table[i].with == reject->with)
+			break;
+
+	printf(" --reject-with %s", reject_table[i].name);
+}
+
+static struct xtables_target reject_tg6_reg = {
+	.name = "REJECT",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.size 		= XT_ALIGN(sizeof(struct ip6t_reject_info)),
+	.userspacesize 	= XT_ALIGN(sizeof(struct ip6t_reject_info)),
+	.help		= REJECT_help,
+	.init		= REJECT_init,
+	.print		= REJECT_print,
+	.save		= REJECT_save,
+	.x6_parse	= REJECT_parse,
+	.x6_options	= REJECT_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&reject_tg6_reg);
+}

extensions/libip6t_REJECT.man

+This is used to send back an error packet in response to the matched
+packet: otherwise it is equivalent to 
+.B DROP
+so it is a terminating TARGET, ending rule traversal.
+This target is only valid in the
+.BR INPUT ,
+.B FORWARD
+and
+.B OUTPUT
+chains, and user-defined chains which are only called from those
+chains.  The following option controls the nature of the error packet
+returned:
+.TP
+\fB\-\-reject\-with\fP \fItype\fP
+The type given can be
+\fBicmp6\-no\-route\fP,
+\fBno\-route\fP,
+\fBicmp6\-adm\-prohibited\fP,
+\fBadm\-prohibited\fP,
+\fBicmp6\-addr\-unreachable\fP,
+\fBaddr\-unreach\fP, or
+\fBicmp6\-port\-unreachable\fP,
+which return the appropriate ICMPv6 error message (\fBicmp6\-port\-unreachable\fP is
+the default). Finally, the option
+\fBtcp\-reset\fP
+can be used on rules which only match the TCP protocol: this causes a
+TCP RST packet to be sent back.  This is mainly useful for blocking 
+.I ident
+(113/tcp) probes which frequently occur when sending mail to broken mail
+hosts (which won't accept your mail otherwise).
+\fBtcp\-reset\fP
+can only be used with kernel versions 2.6.14 or later.

extensions/libip6t_SNAT.c

+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * Based on Rusty Russell's IPv4 SNAT target. Development of IPv6 NAT
+ * funded by Astaro.
+ */
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <xtables.h>
+#include <iptables.h>
+#include <limits.h> /* INT_MAX in ip_tables.h */
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter/nf_nat.h>
+
+enum {
+	O_TO_SRC = 0,
+	O_RANDOM,
+	O_PERSISTENT,
+	O_X_TO_SRC,
+	F_TO_SRC   = 1 << O_TO_SRC,
+	F_RANDOM   = 1 << O_RANDOM,
+	F_X_TO_SRC = 1 << O_X_TO_SRC,
+};
+
+static void SNAT_help(void)
+{
+	printf(
+"SNAT target options:\n"
+" --to-source [<ipaddr>[-<ipaddr>]][:port[-port]]\n"
+"				Address to map source to.\n"
+"[--random] [--persistent]\n");
+}
+
+static const struct xt_option_entry SNAT_opts[] = {
+	{.name = "to-source", .id = O_TO_SRC, .type = XTTYPE_STRING,
+	 .flags = XTOPT_MAND | XTOPT_MULTI},
+	{.name = "random", .id = O_RANDOM, .type = XTTYPE_NONE},
+	{.name = "persistent", .id = O_PERSISTENT, .type = XTTYPE_NONE},
+	XTOPT_TABLEEND,
+};
+
+/* Ranges expected in network order. */
+static void
+parse_to(const char *orig_arg, int portok, struct nf_nat_range *range)
+{
+	char *arg, *start, *end = NULL, *colon = NULL, *dash, *error;
+	const struct in6_addr *ip;
+
+	arg = strdup(orig_arg);
+	if (arg == NULL)
+		xtables_error(RESOURCE_PROBLEM, "strdup");
+
+	start = strchr(arg, '[');
+	if (start == NULL) {
+		start = arg;
+		/* Lets assume one colon is port information. Otherwise its an IPv6 address */
+		colon = strchr(arg, ':');
+		if (colon && strchr(colon+1, ':'))
+			colon = NULL;
+	}
+	else {
+		start++;
+		end = strchr(start, ']');
+		if (end == NULL)
+			xtables_error(PARAMETER_PROBLEM,
+				      "Invalid address format");
+
+		*end = '\0';
+		colon = strchr(end + 1, ':');
+	}
+
+	if (colon) {
+		int port;
+
+		if (!portok)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Need TCP, UDP, SCTP or DCCP with port specification");
+
+		range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+
+		port = atoi(colon+1);
+		if (port <= 0 || port > 65535)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Port `%s' not valid\n", colon+1);
+
+		error = strchr(colon+1, ':');
+		if (error)
+			xtables_error(PARAMETER_PROBLEM,
+				   "Invalid port:port syntax - use dash\n");
+
+		dash = strchr(colon, '-');
+		if (!dash) {
+			range->min_proto.tcp.port
+				= range->max_proto.tcp.port
+				= htons(port);
+		} else {
+			int maxport;
+
+			maxport = atoi(dash + 1);
+			if (maxport <= 0 || maxport > 65535)
+				xtables_error(PARAMETER_PROBLEM,
+					   "Port `%s' not valid\n", dash+1);
+			if (maxport < port)
+				/* People are stupid. */
+				xtables_error(PARAMETER_PROBLEM,
+					   "Port range `%s' funky\n", colon+1);
+			range->min_proto.tcp.port = htons(port);
+			range->max_proto.tcp.port = htons(maxport);
+		}
+		/* Starts with colon or [] colon? No IP info...*/
+		if (colon == arg || colon == arg+2) {
+			free(arg);
+			return;
+		}
+		*colon = '\0';
+	}
+
+	range->flags |= NF_NAT_RANGE_MAP_IPS;
+	dash = strchr(start, '-');
+	if (colon && dash && dash > colon)
+		dash = NULL;
+
+	if (dash)
+		*dash = '\0';
+
+	ip = xtables_numeric_to_ip6addr(start);
+	if (!ip)
+		xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n",
+			      start);
+	range->min_addr.in6 = *ip;
+	if (dash) {
+		ip = xtables_numeric_to_ip6addr(dash + 1);
+		if (!ip)
+			xtables_error(PARAMETER_PROBLEM, "Bad IP address \"%s\"\n",
+				      dash+1);
+		range->max_addr.in6 = *ip;
+	} else
+		range->max_addr = range->min_addr;
+
+	free(arg);
+	return;
+}
+
+static void SNAT_parse(struct xt_option_call *cb)
+{
+	const struct ip6t_entry *entry = cb->xt_entry;
+	struct nf_nat_range *range = cb->data;
+	int portok;
+
+	if (entry->ipv6.proto == IPPROTO_TCP ||
+	    entry->ipv6.proto == IPPROTO_UDP ||
+	    entry->ipv6.proto == IPPROTO_SCTP ||
+	    entry->ipv6.proto == IPPROTO_DCCP ||
+	    entry->ipv6.proto == IPPROTO_ICMP)
+		portok = 1;
+	else
+		portok = 0;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_TO_SRC:
+		if (cb->xflags & F_X_TO_SRC) {
+			if (!kernel_version)
+				get_kernel_version();
+			if (kernel_version > LINUX_VERSION(2, 6, 10))
+				xtables_error(PARAMETER_PROBLEM,
+					   "SNAT: Multiple --to-source not supported");
+		}
+		parse_to(cb->arg, portok, range);
+		break;
+	case O_PERSISTENT:
+		range->flags |= NF_NAT_RANGE_PERSISTENT;
+		break;
+	}
+}
+
+static void SNAT_fcheck(struct xt_fcheck_call *cb)
+{
+	static const unsigned int f = F_TO_SRC | F_RANDOM;
+	struct nf_nat_range *range = cb->data;
+
+	if ((cb->xflags & f) == f)
+		range->flags |= NF_NAT_RANGE_PROTO_RANDOM;
+}
+
+static void print_range(const struct nf_nat_range *range)
+{
+	if (range->flags & NF_NAT_RANGE_MAP_IPS) {
+		if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)
+			printf("[");
+		printf("%s", xtables_ip6addr_to_numeric(&range->min_addr.in6));
+		if (memcmp(&range->min_addr, &range->max_addr,
+			   sizeof(range->min_addr)))
+			printf("-%s", xtables_ip6addr_to_numeric(&range->max_addr.in6));
+		if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)
+			printf("]");
+	}
+	if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
+		printf(":");
+		printf("%hu", ntohs(range->min_proto.tcp.port));
+		if (range->max_proto.tcp.port != range->min_proto.tcp.port)
+			printf("-%hu", ntohs(range->max_proto.tcp.port));
+	}
+}
+
+static void SNAT_print(const void *ip, const struct xt_entry_target *target,
+                       int numeric)
+{
+	const struct nf_nat_range *range = (const void *)target->data;
+
+	printf(" to:");
+	print_range(range);
+	if (range->flags & NF_NAT_RANGE_PROTO_RANDOM)
+		printf(" random");
+	if (range->flags & NF_NAT_RANGE_PERSISTENT)
+		printf(" persistent");
+}
+
+static void SNAT_save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct nf_nat_range *range = (const void *)target->data;
+
+	printf(" --to-source ");
+	print_range(range);
+	if (range->flags & NF_NAT_RANGE_PROTO_RANDOM)
+		printf(" --random");
+	if (range->flags & NF_NAT_RANGE_PERSISTENT)
+		printf(" --persistent");
+}
+
+static struct xtables_target snat_tg_reg = {
+	.name		= "SNAT",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.revision	= 1,
+	.size		= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.userspacesize	= XT_ALIGN(sizeof(struct nf_nat_range)),
+	.help		= SNAT_help,
+	.x6_parse	= SNAT_parse,
+	.x6_fcheck	= SNAT_fcheck,
+	.print		= SNAT_print,
+	.save		= SNAT_save,
+	.x6_options	= SNAT_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&snat_tg_reg);
+}

extensions/libip6t_SNPT.c

+/*
+ * Copyright (c) 2012-2013 Patrick McHardy <kaber@trash.net>
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <xtables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <linux/netfilter_ipv6/ip6t_NPT.h>
+
+enum {
+	O_SRC_PFX	= 1 << 0,
+	O_DST_PFX	= 1 << 1,
+};
+
+static const struct xt_option_entry SNPT_options[] = {
+	{ .name = "src-pfx", .id = O_SRC_PFX, .type = XTTYPE_HOSTMASK,
+	  .flags = XTOPT_MAND },
+	{ .name = "dst-pfx", .id = O_DST_PFX, .type = XTTYPE_HOSTMASK,
+	  .flags = XTOPT_MAND },
+	{ }
+};
+
+static void SNPT_help(void)
+{
+	printf("SNPT target options:"
+	       "\n"
+	       " --src-pfx prefix/length\n"
+	       " --dst-pfx prefix/length\n"
+	       "\n");
+}
+
+static void SNPT_parse(struct xt_option_call *cb)
+{
+	struct ip6t_npt_tginfo *npt = cb->data;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_SRC_PFX:
+		npt->src_pfx = cb->val.haddr;
+		npt->src_pfx_len = cb->val.hlen;
+		break;
+	case O_DST_PFX:
+		npt->dst_pfx = cb->val.haddr;
+		npt->dst_pfx_len = cb->val.hlen;
+		break;
+	}
+}
+
+static void SNPT_print(const void *ip, const struct xt_entry_target *target,
+		       int numeric)
+{
+	const struct ip6t_npt_tginfo *npt = (const void *)target->data;
+
+	printf("src-pfx %s/%u ", xtables_ip6addr_to_numeric(&npt->src_pfx.in6),
+				 npt->src_pfx_len);
+	printf("dst-pfx %s/%u ", xtables_ip6addr_to_numeric(&npt->dst_pfx.in6),
+				 npt->dst_pfx_len);
+}
+
+static void SNPT_save(const void *ip, const struct xt_entry_target *target)
+{
+	static const struct in6_addr zero_addr;
+	const struct ip6t_npt_tginfo *info = (const void *)target->data;
+
+	if (memcmp(&info->src_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
+	    info->src_pfx_len != 0)
+		printf("--src-pfx %s/%u ",
+		       xtables_ip6addr_to_numeric(&info->src_pfx.in6),
+		       info->src_pfx_len);
+	if (memcmp(&info->dst_pfx.in6, &zero_addr, sizeof(zero_addr)) != 0 ||
+	    info->dst_pfx_len != 0)
+		printf("--dst-pfx %s/%u ",
+		       xtables_ip6addr_to_numeric(&info->dst_pfx.in6),
+		       info->dst_pfx_len);
+}
+
+static struct xtables_target snpt_tg_reg = {
+	.name		= "SNPT",
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_IPV6,
+	.size		= XT_ALIGN(sizeof(struct ip6t_npt_tginfo)),
+	.userspacesize	= offsetof(struct ip6t_npt_tginfo, adjustment),
+	.help		= SNPT_help,
+	.x6_parse	= SNPT_parse,
+	.print		= SNPT_print,
+	.save		= SNPT_save,
+	.x6_options	= SNPT_options,
+};
+
+void _init(void)
+{
+	xtables_register_target(&snpt_tg_reg);
+}

extensions/libip6t_SNPT.man

+Provides stateless source IPv6-to-IPv6 Network Prefix Translation (as described
+by RFC 6296).
+.PP
+You have to use this target in the
+.B mangle
+table, not in the
+.B nat
+table. It takes the following options:
+.TP
+\fB\-\-src\-pfx\fP [\fIprefix/\fP\fIlength]
+Set source prefix that you want to translate and length
+.TP
+\fB\-\-dst\-pfx\fP [\fIprefix/\fP\fIlength]
+Set destination prefix that you want to use in the translation and length
+.PP
+You have to use the DNPT target to undo the translation. Example:
+.IP
+ip6tables \-t mangle \-I POSTROUTING \-s fd00::/64 \! \-o vboxnet0
+\-j SNPT \-\-src-pfx fd00::/64 \-\-dst-pfx 2001:e20:2000:40f::/64
+.IP
+ip6tables \-t mangle \-I PREROUTING \-i wlan0 \-d 2001:e20:2000:40f::/64
+\-j DNPT \-\-src-pfx 2001:e20:2000:40f::/64 \-\-dst-pfx fd00::/64
+.PP
+You may need to enable IPv6 neighbor proxy:
+.IP
+sysctl -w net.ipv6.conf.all.proxy_ndp=1
+.PP
+You also have to use the
+.B NOTRACK
+target to disable connection tracking for translated flows.

extensions/libip6t_ah.c

+#include <stdio.h>
+#include <xtables.h>
+#include <linux/netfilter_ipv6/ip6t_ah.h>
+
+enum {
+	O_AHSPI = 0,
+	O_AHLEN,
+	O_AHRES,
+};
+
+static void ah_help(void)
+{
+	printf(
+"ah match options:\n"
+"[!] --ahspi spi[:spi]          match spi (range)\n"
+"[!] --ahlen length             total length of this header\n"
+" --ahres                       check the reserved field too\n");
+}
+
+#define s struct ip6t_ah
+static const struct xt_option_entry ah_opts[] = {
+	{.name = "ahspi", .id = O_AHSPI, .type = XTTYPE_UINT32RC,
+	 .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, spis)},
+	{.name = "ahlen", .id = O_AHLEN, .type = XTTYPE_UINT32,
+	 .flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, hdrlen)},
+	{.name = "ahres", .id = O_AHRES, .type = XTTYPE_NONE},
+	XTOPT_TABLEEND,
+};
+#undef s
+
+static void ah_parse(struct xt_option_call *cb)
+{
+	struct ip6t_ah *ahinfo = cb->data;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_AHSPI:
+		if (cb->nvals == 1)
+			ahinfo->spis[1] = ahinfo->spis[0];
+		if (cb->invert)
+			ahinfo->invflags |= IP6T_AH_INV_SPI;
+		break;
+	case O_AHLEN:
+		if (cb->invert)
+			ahinfo->invflags |= IP6T_AH_INV_LEN;
+		break;
+	case O_AHRES:
+		ahinfo->hdrres = 1;
+		break;
+	}
+}
+
+static void
+print_spis(const char *name, uint32_t min, uint32_t max,
+	    int invert)
+{
+	const char *inv = invert ? "!" : "";
+
+	if (min != 0 || max != 0xFFFFFFFF || invert) {
+		if (min == max)
+			printf("%s:%s%u", name, inv, min);
+		else
+			printf("%ss:%s%u:%u", name, inv, min, max);
+	}
+}
+
+static void
+print_len(const char *name, uint32_t len, int invert)
+{
+	const char *inv = invert ? "!" : "";
+
+	if (len != 0 || invert)
+		printf("%s:%s%u", name, inv, len);
+}
+
+static void ah_print(const void *ip, const struct xt_entry_match *match,
+                     int numeric)
+{
+	const struct ip6t_ah *ah = (struct ip6t_ah *)match->data;
+
+	printf(" ah ");
+	print_spis("spi", ah->spis[0], ah->spis[1],
+		    ah->invflags & IP6T_AH_INV_SPI);
+	print_len("length", ah->hdrlen, 
+		    ah->invflags & IP6T_AH_INV_LEN);
+
+	if (ah->hdrres)
+		printf(" reserved");
+
+	if (ah->invflags & ~IP6T_AH_INV_MASK)
+		printf(" Unknown invflags: 0x%X",
+		       ah->invflags & ~IP6T_AH_INV_MASK);
+}
+
+static void ah_save(const void *ip, const struct xt_entry_match *match)
+{
+	const struct ip6t_ah *ahinfo = (struct ip6t_ah *)match->data;
+
+	if (!(ahinfo->spis[0] == 0
+	    && ahinfo->spis[1] == 0xFFFFFFFF)) {
+		printf("%s --ahspi ",
+			(ahinfo->invflags & IP6T_AH_INV_SPI) ? " !" : "");
+		if (ahinfo->spis[0]
+		    != ahinfo->spis[1])
+			printf("%u:%u",
+			       ahinfo->spis[0],
+			       ahinfo->spis[1]);
+		else
+			printf("%u",
+			       ahinfo->spis[0]);
+	}
+
+	if (ahinfo->hdrlen != 0 || (ahinfo->invflags & IP6T_AH_INV_LEN) ) {
+		printf("%s --ahlen %u",
+			(ahinfo->invflags & IP6T_AH_INV_LEN) ? " !" : "",
+			ahinfo->hdrlen);
+	}
+
+	if (ahinfo->hdrres != 0 )
+		printf(" --ahres");
+}
+
+static struct xtables_match ah_mt6_reg = {
+	.name          = "ah",
+	.version       = XTABLES_VERSION,
+	.family        = NFPROTO_IPV6,
+	.size          = XT_ALIGN(sizeof(struct ip6t_ah)),
+	.userspacesize = XT_ALIGN(sizeof(struct ip6t_ah)),
+	.help          = ah_help,
+	.print         = ah_print,
+	.save          = ah_save,
+	.x6_parse      = ah_parse,
+	.x6_options    = ah_opts,
+};
+
+void
+_init(void)
+{
+	xtables_register_match(&ah_mt6_reg);
+}

extensions/libip6t_ah.man

+This module matches the parameters in Authentication header of IPsec packets.
+.TP
+[\fB!\fP] \fB\-\-ahspi\fP \fIspi\fP[\fB:\fP\fIspi\fP]
+Matches SPI.
+.TP
+[\fB!\fP] \fB\-\-ahlen\fP \fIlength\fP
+Total length of this header in octets.
+.TP
+\fB\-\-ahres\fP
+Matches if the reserved field is filled with zero.

extensions/libip6t_dst.c

+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <xtables.h>
+#include <linux/netfilter_ipv6/ip6t_opts.h>
+
+enum {
+	O_DSTLEN = 0,
+	O_DSTOPTS,
+};
+
+static void dst_help(void)
+{
+	printf(
+"dst match options:\n"
+"[!] --dst-len length            total length of this header\n"
+"  --dst-opts TYPE[:LEN][,TYPE[:LEN]...]\n"
+"                                Options and its length (list, max: %d)\n",
+IP6T_OPTS_OPTSNR);
+}
+
+static const struct xt_option_entry dst_opts[] = {
+	{.name = "dst-len", .id = O_DSTLEN, .type = XTTYPE_UINT32,
+	 .flags = XTOPT_INVERT | XTOPT_PUT,
+	 XTOPT_POINTER(struct ip6t_opts, hdrlen)},
+	{.name = "dst-opts", .id = O_DSTOPTS, .type = XTTYPE_STRING},
+	XTOPT_TABLEEND,
+};
+
+static uint32_t
+parse_opts_num(const char *idstr, const char *typestr)
+{
+	unsigned long int id;
+	char* ep;
+
+	id = strtoul(idstr, &ep, 0);
+
+	if ( idstr == ep ) {
+		xtables_error(PARAMETER_PROBLEM,
+		           "dst: no valid digits in %s `%s'", typestr, idstr);
+	}
+	if ( id == ULONG_MAX  && errno == ERANGE ) {
+		xtables_error(PARAMETER_PROBLEM,
+			   "%s `%s' specified too big: would overflow",
+			   typestr, idstr);
+	}
+	if ( *idstr != '\0'  && *ep != '\0' ) {
+		xtables_error(PARAMETER_PROBLEM,
+		           "dst: error parsing %s `%s'", typestr, idstr);
+	}
+	return id;
+}
+
+static int
+parse_options(const char *optsstr, uint16_t *opts)
+{
+        char *buffer, *cp, *next, *range;
+        unsigned int i;
+	
+	buffer = strdup(optsstr);
+        if (!buffer)
+		xtables_error(OTHER_PROBLEM, "strdup failed");
+			
+        for (cp = buffer, i = 0; cp && i < IP6T_OPTS_OPTSNR; cp = next, i++)
+        {
+                next = strchr(cp, ',');
+
+                if (next)
+			*next++='\0';
+
+                range = strchr(cp, ':');
+
+                if (range) {
+                        if (i == IP6T_OPTS_OPTSNR-1)
+				xtables_error(PARAMETER_PROBLEM,
+                                           "too many ports specified");
+                        *range++ = '\0';
+                }
+
+		opts[i] = (parse_opts_num(cp, "opt") & 0xFF) << 8;
+                if (range) {
+			if (opts[i] == 0)
+				xtables_error(PARAMETER_PROBLEM,
+					"PAD0 hasn't got length");
+			opts[i] |= parse_opts_num(range, "length") & 0xFF;
+                } else
+                        opts[i] |= (0x00FF);
+
+#ifdef DEBUG
+		printf("opts str: %s %s\n", cp, range);
+		printf("opts opt: %04X\n", opts[i]);
+#endif
+	}
+
+        if (cp)
+		xtables_error(PARAMETER_PROBLEM, "too many addresses specified");
+
+	free(buffer);
+
+#ifdef DEBUG
+	printf("addr nr: %d\n", i);
+#endif
+
+	return i;
+}
+
+static void dst_parse(struct xt_option_call *cb)
+{
+	struct ip6t_opts *optinfo = cb->data;
+
+	xtables_option_parse(cb);
+	switch (cb->entry->id) {
+	case O_DSTLEN:
+		optinfo->flags |= IP6T_OPTS_LEN;
+		break;
+	case O_DSTOPTS:
+		optinfo->optsnr = parse_options(cb->arg, optinfo->opts);
+		optinfo->flags |= IP6T_OPTS_OPTS;
+		break;
+	}
+}
+
+static void
+print_options(unsigned int optsnr, uint16_t *optsp)
+{
+	unsigned int i;
+
+	printf(" ");
+	for(i = 0; i < optsnr; i++) {
+		printf("%d", (optsp[i] & 0xFF00) >> 8);
+
+		if ((optsp[i] & 0x00FF) != 0x00FF)
+			printf(":%d", (optsp[i] & 0x00FF));
+
+		printf("%c", (i != optsnr - 1) ? ',' : ' ');
+	}
+}
+
+static void dst_print(const void *ip, const struct xt_entry_match *match,
+                      int numeric)
+{
+	const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data;
+
+	printf(" dst");
+	if (optinfo->flags & IP6T_OPTS_LEN)
+		printf(" length:%s%u",
+			optinfo->invflags & IP6T_OPTS_INV_LEN ? "!" : "",
+			optinfo->hdrlen);
+
+	if (optinfo->flags & IP6T_OPTS_OPTS)
+		printf(" opts");
+
+	print_options(optinfo->optsnr, (uint16_t *)optinfo->opts);
+
+	if (optinfo->invflags & ~IP6T_OPTS_INV_MASK)
+		printf(" Unknown invflags: 0x%X",
+		       optinfo->invflags & ~IP6T_OPTS_INV_MASK);
+}
+
+static void dst_save(const void *ip, const struct xt_entry_match *match)
+{
+	const struct ip6t_opts *optinfo = (struct ip6t_opts *)match->data;
+
+	if (optinfo->flags & IP6T_OPTS_LEN) {
+		printf("%s --dst-len %u",
+			(optinfo->invflags & IP6T_OPTS_INV_LEN) ? " !" : "",
+			optinfo->hdrlen);
+	}
+
+	if (optinfo->flags & IP6T_OPTS_OPTS)
+		printf(" --dst-opts");
+
+	print_options(optinfo->optsnr, (uint16_t *)optinfo->opts);
+}
+
+static struct xtables_match dst_mt6_reg = {
+	.name          = "dst",
+	.version       = XTABLES_VERSION,
+	.family        = NFPROTO_IPV6,
+	.size          = XT_ALIGN(sizeof(struct ip6t_opts)),
+	.userspacesize = XT_ALIGN(sizeof(struct ip6t_opts)),
+	.help          = dst_help,
+	.print         = dst_print,
+	.save          = dst_save,
+	.x6_parse      = dst_parse,
+	.x6_options    = dst_opts,
+};
+
+void
+_init(void)
+{
+	xtables_register_match(&dst_mt6_reg);
+}