X-Git-Url: http://git.openwrt.org/?p=project%2Ffirewall3.git;a=blobdiff_plain;f=iptables.c;h=d8482399dbaa85f611f6720aaae1d29727b0bf17;hp=f5f4952bf129817bab48fa3fe72254be35bbe317;hb=HEAD;hpb=b6109157659a7d3f389797cfc6f91c90641ba33e

diff --git a/iptables.c b/iptables.c
index f5f4952..d03d1dd 100644
--- a/iptables.c
+++ b/iptables.c
@@ -1,7 +1,7 @@
 /*
  * firewall3 - 3rd OpenWrt UCI firewall implementation
  *
- *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
+ *   Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -16,83 +16,258 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#define _GNU_SOURCE /* RTLD_NEXT */
+
+/* include userspace headers */
+#include <dlfcn.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <sys/utsname.h>
+#include <sys/socket.h>
+
+/* prevent indirect inclusion of kernel headers */
+#define _LINUX_IF_H
+#define _LINUX_IN_H
+#define _LINUX_IN6_H
+
+/* prevent libiptc from including kernel headers */
+#define _FWCHAINS_KERNEL_HEADERS_H
+
+/* finally include libiptc and xtables */
+#include <libiptc/libiptc.h>
+#include <libiptc/libip6tc.h>
+#include <xtables.h>
+
+#include <setjmp.h>
+
+#include "options.h"
+
+/* xtables interface */
+#if (XTABLES_VERSION_CODE >= 10)
+# include "xtables-10.h"
+#elif (XTABLES_VERSION_CODE == 5)
+# include "xtables-5.h"
+#else
+# error "Unsupported xtables version"
+#endif
+
 #include "iptables.h"
 
+#define XT_LOCK_NAME "/var/run/xtables.lock"
+static int xt_lock_fd = -1;
+
+struct fw3_ipt_rule {
+	struct fw3_ipt_handle *h;
+
+	union {
+		struct ipt_entry e;
+		struct ip6t_entry e6;
+	};
+
+	struct xtables_rule_match *matches;
+	struct xtables_target *target;
+
+	int argc;
+	char **argv;
+
+	uint32_t protocol;
+	bool protocol_loaded;
+};
+
+static struct option base_opts[] = {
+	{ .name = "match",         .has_arg = 1, .val = 'm' },
+	{ .name = "jump",          .has_arg = 1, .val = 'j' },
+	{ .name = "in-interface",  .has_arg = 1, .val = 'i' },
+	{ .name = "out-interface", .has_arg = 1, .val = 'o' },
+	{ .name = "source",        .has_arg = 1, .val = 's' },
+	{ .name = "destination",   .has_arg = 1, .val = 'd' },
+	{ NULL }
+};
+
+
+static jmp_buf fw3_ipt_error_jmp;
+
+static __attribute__((noreturn))
+void fw3_ipt_error_handler(enum xtables_exittype status,
+                           const char *fmt, ...)
+{
+	va_list args;
+
+	fprintf(stderr, "     ! Exception: ");
+
+	va_start(args, fmt);
+	vfprintf(stderr, fmt, args);
+	va_end(args);
+
+	longjmp(fw3_ipt_error_jmp, status);
+}
+
+static struct xtables_globals xtg = {
+	.option_offset = 0,
+	.program_version = "4",
+	.orig_opts = base_opts,
+	.exit_err = fw3_ipt_error_handler,
+#if XTABLES_VERSION_CODE > 10
+	.compat_rev = xtables_compatible_revision,
+#endif
+};
+
+static struct xtables_globals xtg6 = {
+	.option_offset = 0,
+	.program_version = "6",
+	.orig_opts = base_opts,
+	.exit_err = fw3_ipt_error_handler,
+#if XTABLES_VERSION_CODE > 10
+	.compat_rev = xtables_compatible_revision,
+#endif
+};
+
+static struct {
+	bool retain;
+	int mcount, tcount;
+	struct xtables_match **matches;
+	struct xtables_target **targets;
+	void (*register_match)(struct xtables_match *);
+	void (*register_target)(struct xtables_target *);
+} xext;
+
+
+/* Required by certain extensions like SNAT and DNAT */
+int kernel_version = 0;
+
+void
+get_kernel_version(void)
+{
+	static struct utsname uts;
+	int x = 3, y = 0, z = 0;
+
+	if (uname(&uts) != -1)
+		sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
+
+	kernel_version = 0x10000 * x + 0x100 * y + z;
+}
+
+static void fw3_init_extensions(void)
+{
+	init_extensions();
+	init_extensions4();
+
+#ifndef DISABLE_IPV6
+	init_extensions6();
+#endif
+}
 
 struct fw3_ipt_handle *
 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
 {
+	int i;
 	struct fw3_ipt_handle *h;
 
-	h = malloc(sizeof(*h));
+	h = fw3_alloc(sizeof(*h));
 
-	if (!h)
-		return NULL;
+	xtables_init();
+
+	while (!fw3_lock_path(&xt_lock_fd, XT_LOCK_NAME)) {
+		warn("Currently busy xtables.lock - wait 1 second");
+		sleep(1);
+	}
 
 	if (family == FW3_FAMILY_V6)
 	{
+#ifndef DISABLE_IPV6
 		h->family = FW3_FAMILY_V6;
 		h->table  = table;
 		h->handle = ip6tc_init(fw3_flag_names[table]);
+
+		xtables_set_params(&xtg6);
+		xtables_set_nfproto(NFPROTO_IPV6);
+#endif
 	}
 	else
 	{
 		h->family = FW3_FAMILY_V4;
 		h->table  = table;
 		h->handle = iptc_init(fw3_flag_names[table]);
+
+		xtables_set_params(&xtg);
+		xtables_set_nfproto(NFPROTO_IPV4);
 	}
 
 	if (!h->handle)
 	{
 		free(h);
+		fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
 		return NULL;
 	}
 
+	fw3_xt_reset();
+	fw3_init_extensions();
+
+	if (xext.register_match)
+		for (i = 0; i < xext.mcount; i++)
+			xext.register_match(xext.matches[i]);
+
+	if (xext.register_target)
+		for (i = 0; i < xext.tcount; i++)
+			xext.register_target(xext.targets[i]);
+
 	return h;
 }
 
-void fw3_ipt_set_policy(struct fw3_ipt_handle *h, enum fw3_flag policy)
+static void
+debug(struct fw3_ipt_handle *h, const char *fmt, ...)
 {
-	if (h->table != FW3_TABLE_FILTER)
-		return;
+	va_list ap;
+
+	printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
+	                    fw3_flag_names[h->table]);
+
+	va_start(ap, fmt);
+	vprintf(fmt, ap);
+	va_end(ap);
+}
+
+void
+fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
+                   enum fw3_flag policy)
+{
+	if (fw3_pr_debug)
+		debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
 
+#ifndef DISABLE_IPV6
 	if (h->family == FW3_FAMILY_V6)
-	{
-		ip6tc_set_policy("INPUT", fw3_flag_names[policy], NULL, h->handle);
-		ip6tc_set_policy("OUTPUT", fw3_flag_names[policy], NULL, h->handle);
-		ip6tc_set_policy("FORWARD", fw3_flag_names[policy], NULL, h->handle);
-	}
+		ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 	else
-	{
-		iptc_set_policy("INPUT", fw3_flag_names[policy], NULL, h->handle);
-		iptc_set_policy("OUTPUT", fw3_flag_names[policy], NULL, h->handle);
-		iptc_set_policy("FORWARD", fw3_flag_names[policy], NULL, h->handle);
-	}
+#endif
+		iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 }
 
-void fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
+void
+fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
 {
+	if (fw3_pr_debug)
+		debug(h, "-F %s\n", chain);
+
+#ifndef DISABLE_IPV6
 	if (h->family == FW3_FAMILY_V6)
-	{
-		if (ip6tc_flush_entries(chain, h->handle))
-			ip6tc_delete_chain(chain, h->handle);
-	}
+		ip6tc_flush_entries(chain, h->handle);
 	else
-	{
-		if (iptc_flush_entries(chain, h->handle))
-			iptc_delete_chain(chain, h->handle);
-	}
+#endif
+		iptc_flush_entries(chain, h->handle);
 }
 
-void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
+static void
+delete_rules(struct fw3_ipt_handle *h, const char *target)
 {
 	unsigned int num;
 	const struct ipt_entry *e;
-	const struct ip6t_entry *e6;
 	const char *chain;
 	const char *t;
 	bool found;
 
+#ifndef DISABLE_IPV6
 	if (h->family == FW3_FAMILY_V6)
 	{
 		for (chain = ip6tc_first_chain(h->handle);
@@ -102,6 +277,7 @@ void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
 			do {
 				found = false;
 
+				const struct ip6t_entry *e6;
 				for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
 					 e6 != NULL;
 					 num++, e6 = ip6tc_next_rule(e6, h->handle))
@@ -110,6 +286,9 @@ void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
 
 					if (*t && !strcmp(t, target))
 					{
+						if (fw3_pr_debug)
+							debug(h, "-D %s %u\n", chain, num + 1);
+
 						ip6tc_delete_num_entry(chain, num, h->handle);
 						found = true;
 						break;
@@ -119,6 +298,7 @@ void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
 		}
 	}
 	else
+#endif
 	{
 		for (chain = iptc_first_chain(h->handle);
 		     chain != NULL;
@@ -135,6 +315,9 @@ void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
 
 					if (*t && !strcmp(t, target))
 					{
+						if (fw3_pr_debug)
+							debug(h, "-D %s %u\n", chain, num + 1);
+
 						iptc_delete_num_entry(chain, num, h->handle);
 						found = true;
 						break;
@@ -145,10 +328,185 @@ void fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
 	}
 }
 
-void fw3_ipt_flush(struct fw3_ipt_handle *h)
+static bool
+is_referenced(struct fw3_ipt_handle *h, const char *target)
+{
+	const struct ipt_entry *e;
+	const char *chain;
+	const char *t;
+
+#ifndef DISABLE_IPV6
+	if (h->family == FW3_FAMILY_V6)
+	{
+		for (chain = ip6tc_first_chain(h->handle);
+		     chain != NULL;
+		     chain = ip6tc_next_chain(h->handle))
+		{
+			const struct ip6t_entry *e6;
+			for (e6 = ip6tc_first_rule(chain, h->handle);
+			     e6 != NULL;
+			     e6 = ip6tc_next_rule(e6, h->handle))
+			{
+				t = ip6tc_get_target(e6, h->handle);
+
+				if (*t && !strcmp(t, target))
+					return true;
+			}
+		}
+	}
+	else
+#endif
+	{
+		for (chain = iptc_first_chain(h->handle);
+		     chain != NULL;
+		     chain = iptc_next_chain(h->handle))
+		{
+			for (e = iptc_first_rule(chain, h->handle);
+			     e != NULL;
+			     e = iptc_next_rule(e, h->handle))
+			{
+				t = iptc_get_target(e, h->handle);
+
+				if (*t && !strcmp(t, target))
+					return true;
+			}
+		}
+	}
+
+	return false;
+}
+
+void
+fw3_ipt_delete_chain(struct fw3_ipt_handle *h, bool if_unused,
+                     const char *chain)
+{
+	if (if_unused && is_referenced(h, chain))
+		return;
+
+	delete_rules(h, chain);
+
+	if (fw3_pr_debug)
+		debug(h, "-X %s\n", chain);
+
+#ifndef DISABLE_IPV6
+	if (h->family == FW3_FAMILY_V6)
+		ip6tc_delete_chain(chain, h->handle);
+	else
+#endif
+		iptc_delete_chain(chain, h->handle);
+}
+
+static bool
+has_rule_tag(const void *base, unsigned int start, unsigned int end)
+{
+	unsigned int i;
+	const struct xt_entry_match *em;
+
+	for (i = start; i < end; i += em->u.match_size)
+	{
+		em = base + i;
+
+		if (strcmp(em->u.user.name, "comment"))
+			continue;
+
+		if (!memcmp(em->data, "!fw3", 4))
+			return true;
+	}
+
+	return false;
+}
+
+void
+fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain)
+{
+	unsigned int num;
+	const struct ipt_entry *e;
+	bool found;
+
+#ifndef DISABLE_IPV6
+	if (h->family == FW3_FAMILY_V6)
+	{
+		if (!ip6tc_is_chain(chain, h->handle))
+			return;
+
+		do {
+			found = false;
+
+			const struct ip6t_entry *e6;
+			for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
+				 e6 != NULL;
+				 num++, e6 = ip6tc_next_rule(e6, h->handle))
+			{
+				if (has_rule_tag(e6, sizeof(*e6), e6->target_offset))
+				{
+					if (fw3_pr_debug)
+						debug(h, "-D %s %u\n", chain, num + 1);
+
+					ip6tc_delete_num_entry(chain, num, h->handle);
+					found = true;
+					break;
+				}
+			}
+		} while (found);
+	}
+	else
+#endif
+	{
+		if (!iptc_is_chain(chain, h->handle))
+			return;
+
+		do {
+			found = false;
+
+			for (num = 0, e = iptc_first_rule(chain, h->handle);
+				 e != NULL;
+				 num++, e = iptc_next_rule(e, h->handle))
+			{
+				if (has_rule_tag(e, sizeof(*e), e->target_offset))
+				{
+					if (fw3_pr_debug)
+						debug(h, "-D %s %u\n", chain, num + 1);
+
+					iptc_delete_num_entry(chain, num, h->handle);
+					found = true;
+					break;
+				}
+			}
+		} while (found);
+	}
+}
+
+
+static bool
+is_chain(struct fw3_ipt_handle *h, const char *name)
+{
+#ifndef DISABLE_IPV6
+	if (h->family == FW3_FAMILY_V6)
+		return ip6tc_is_chain(name, h->handle);
+	else
+#endif
+		return iptc_is_chain(name, h->handle);
+}
+
+void
+fw3_ipt_create_chain(struct fw3_ipt_handle *h, bool ignore_existing,
+                     const char *chain)
+{
+	if (ignore_existing && is_chain(h, chain))
+		return;
+
+	if (fw3_pr_debug)
+		debug(h, "-N %s\n", chain);
+
+	iptc_create_chain(chain, h->handle);
+}
+
+void
+fw3_ipt_flush(struct fw3_ipt_handle *h)
 {
 	const char *chain;
 
+#ifndef DISABLE_IPV6
 	if (h->family == FW3_FAMILY_V6)
 	{
 		for (chain = ip6tc_first_chain(h->handle);
@@ -166,6 +524,7 @@ void fw3_ipt_flush(struct fw3_ipt_handle *h)
 		}
 	}
 	else
+#endif
 	{
 		for (chain = iptc_first_chain(h->handle);
 		     chain != NULL;
@@ -183,12 +542,1398 @@ void fw3_ipt_flush(struct fw3_ipt_handle *h)
 	}
 }
 
-void fw3_ipt_commit(struct fw3_ipt_handle *h)
+static bool
+chain_is_empty(struct fw3_ipt_handle *h, const char *chain)
+{
+#ifndef DISABLE_IPV6
+	if (h->family == FW3_FAMILY_V6)
+		return (!ip6tc_builtin(chain, h->handle) &&
+		        !ip6tc_first_rule(chain, h->handle));
+#endif
+
+	return (!iptc_builtin(chain, h->handle) &&
+	        !iptc_first_rule(chain, h->handle));
+}
+
+void
+fw3_ipt_gc(struct fw3_ipt_handle *h)
+{
+	const char *chain;
+	bool found;
+
+#ifndef DISABLE_IPV6
+	if (h->family == FW3_FAMILY_V6)
+	{
+		do {
+			found = false;
+
+			for (chain = ip6tc_first_chain(h->handle);
+				 chain != NULL;
+				 chain = ip6tc_next_chain(h->handle))
+			{
+				if (!chain_is_empty(h, chain))
+					continue;
+
+				fw3_ipt_delete_chain(h, false, chain);
+				found = true;
+				break;
+			}
+		} while(found);
+	}
+	else
+#endif
+	{
+		do {
+			found = false;
+
+			for (chain = iptc_first_chain(h->handle);
+				 chain != NULL;
+				 chain = iptc_next_chain(h->handle))
+			{
+				warn("C=%s\n", chain);
+
+				if (!chain_is_empty(h, chain))
+					continue;
+
+				warn("D=%s\n", chain);
+
+				fw3_ipt_delete_chain(h, false, chain);
+				found = true;
+				break;
+			}
+		} while (found);
+	}
+}
+
+void
+fw3_ipt_commit(struct fw3_ipt_handle *h)
 {
+	int rv;
+
+#ifndef DISABLE_IPV6
 	if (h->family == FW3_FAMILY_V6)
-		ip6tc_commit(h->handle);
+	{
+		rv = ip6tc_commit(h->handle);
+		if (!rv)
+			warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
+	}
 	else
-		iptc_commit(h->handle);
+#endif
+	{
+		rv = iptc_commit(h->handle);
+		if (!rv)
+			warn("iptc_commit(): %s", iptc_strerror(errno));
+	}
+}
 
+void
+fw3_ipt_close(struct fw3_ipt_handle *h)
+{
+	fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
 	free(h);
 }
+
+struct fw3_ipt_rule *
+fw3_ipt_rule_new(struct fw3_ipt_handle *h)
+{
+	struct fw3_ipt_rule *r;
+
+	r = fw3_alloc(sizeof(*r));
+
+	r->h = h;
+	r->argv = fw3_alloc(sizeof(char *));
+	r->argv[r->argc++] = "fw3";
+
+	return r;
+}
+
+
+static char *
+get_protoname(struct fw3_ipt_rule *r)
+{
+	const struct xtables_pprot *pp;
+
+	if (r->protocol)
+		for (pp = xtables_chain_protos; pp->name; pp++)
+			if (pp->num == r->protocol)
+				return (char *)pp->name;
+
+	return NULL;
+}
+
+static struct xtables_match *
+find_match(struct fw3_ipt_rule *r, const char *name)
+{
+	struct xtables_match *m;
+
+	xext.retain = true;
+	m = xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
+	xext.retain = false;
+
+	return m;
+}
+
+static void
+init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
+{
+	size_t s;
+	struct xtables_globals *g;
+
+	if (!m)
+		return;
+
+	s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
+
+	m->m = fw3_alloc(s);
+
+	fw3_xt_set_match_name(m);
+
+	m->m->u.user.revision = m->revision;
+	m->m->u.match_size = s;
+
+	/* free previous userspace data */
+	fw3_xt_free_match_udata(m);
+
+	if (m->init)
+		m->init(m->m);
+
+	/* don't merge options if no_clone is set and this match is a clone */
+	if (no_clone && (m == m->next))
+		return;
+
+	/* merge option table */
+	g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
+	fw3_xt_merge_match_options(g, m);
+}
+
+static bool
+need_protomatch(struct fw3_ipt_rule *r, const char *pname)
+{
+	struct xtables_match *match;
+
+	if (!pname)
+		return false;
+
+	match = xtables_find_match(pname, XTF_DONT_LOAD, NULL);
+	if (!match)
+		return true;
+
+	/* Free any kind of clone from xtables_find_match */
+	if (match == match->next)
+		free(match);
+	return !r->protocol_loaded;
+}
+
+static struct xtables_match *
+load_protomatch(struct fw3_ipt_rule *r)
+{
+	const char *pname = get_protoname(r);
+
+	if (!need_protomatch(r, pname))
+		return NULL;
+
+	return find_match(r, pname);
+}
+
+static struct xtables_target *
+find_target(struct fw3_ipt_rule *r, const char *name)
+{
+	struct xtables_target *t;
+
+	xext.retain = true;
+
+	if (is_chain(r->h, name))
+		t = xtables_find_target(XT_STANDARD_TARGET, XTF_TRY_LOAD);
+	else
+		t = xtables_find_target(name, XTF_TRY_LOAD);
+
+	xext.retain = false;
+
+	return t;
+}
+
+static struct xtables_target *
+get_target(struct fw3_ipt_rule *r, const char *name)
+{
+	size_t s;
+	struct xtables_target *t;
+	struct xtables_globals *g;
+
+	t = find_target(r, name);
+
+	if (!t)
+		return NULL;
+
+	s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
+	t->t = fw3_alloc(s);
+
+	fw3_xt_set_target_name(t, name);
+
+	t->t->u.user.revision = t->revision;
+	t->t->u.target_size = s;
+
+	/* free previous userspace data */
+	fw3_xt_free_target_udata(t);
+
+	if (t->init)
+		t->init(t->t);
+
+	/* merge option table */
+	g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
+	fw3_xt_merge_target_options(g, t);
+
+	r->target = t;
+
+	return t;
+}
+
+void
+fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
+{
+	uint32_t pr;
+
+	if (!proto || proto->any)
+		return;
+
+	pr = proto->protocol;
+
+#ifndef DISABLE_IPV6
+	if (r->h->family == FW3_FAMILY_V6)
+	{
+		if (pr == 1)
+			pr = 58;
+
+		r->e6.ipv6.proto = pr;
+		r->e6.ipv6.flags |= IP6T_F_PROTO;
+
+		if (proto->invert)
+			r->e6.ipv6.invflags |= XT_INV_PROTO;
+	}
+	else
+#endif
+	{
+		r->e.ip.proto = pr;
+
+		if (proto->invert)
+			r->e.ip.invflags |= XT_INV_PROTO;
+	}
+
+	r->protocol = pr;
+}
+
+void
+fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
+                    struct fw3_device *in, struct fw3_device *out)
+{
+#ifndef DISABLE_IPV6
+	if (r->h->family == FW3_FAMILY_V6)
+	{
+		if (in && !in->any)
+		{
+			xtables_parse_interface(in->name, r->e6.ipv6.iniface,
+			                                  r->e6.ipv6.iniface_mask);
+
+			if (in->invert)
+				r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
+		}
+
+		if (out && !out->any)
+		{
+			xtables_parse_interface(out->name, r->e6.ipv6.outiface,
+			                                   r->e6.ipv6.outiface_mask);
+
+			if (out->invert)
+				r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
+		}
+	}
+	else
+#endif
+	{
+		if (in && !in->any)
+		{
+			xtables_parse_interface(in->name, r->e.ip.iniface,
+			                                  r->e.ip.iniface_mask);
+
+			if (in->invert)
+				r->e.ip.invflags |= IPT_INV_VIA_IN;
+		}
+
+		if (out && !out->any)
+		{
+			xtables_parse_interface(out->name, r->e.ip.outiface,
+			                                   r->e.ip.outiface_mask);
+
+			if (out->invert)
+				r->e.ip.invflags |= IPT_INV_VIA_OUT;
+		}
+	}
+}
+
+
+void
+fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
+                      struct fw3_address *src, struct fw3_address *dest)
+{
+	if ((src && src->range) || (dest && dest->range))
+	{
+		fw3_ipt_rule_addarg(r, false, "-m", "iprange");
+	}
+
+	if (src && src->set)
+	{
+		if (src->range)
+		{
+			fw3_ipt_rule_addarg(r, src->invert, "--src-range",
+			                    fw3_address_to_string(src, false, false));
+		}
+#ifndef DISABLE_IPV6
+		else if (r->h->family == FW3_FAMILY_V6)
+		{
+			r->e6.ipv6.src = src->address.v6;
+			r->e6.ipv6.smsk = src->mask.v6;
+
+			int i;
+			for (i = 0; i < 4; i++)
+				r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
+
+			if (src->invert)
+				r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
+		}
+#endif
+		else
+		{
+			r->e.ip.src = src->address.v4;
+			r->e.ip.smsk = src->mask.v4;
+
+			r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
+
+			if (src->invert)
+				r->e.ip.invflags |= IPT_INV_SRCIP;
+		}
+	}
+
+	if (dest && dest->set)
+	{
+		if (dest->range)
+		{
+			fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
+			                    fw3_address_to_string(dest, false, false));
+		}
+#ifndef DISABLE_IPV6
+		else if (r->h->family == FW3_FAMILY_V6)
+		{
+			r->e6.ipv6.dst = dest->address.v6;
+			r->e6.ipv6.dmsk = dest->mask.v6;
+
+			int i;
+			for (i = 0; i < 4; i++)
+				r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
+
+			if (dest->invert)
+				r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
+		}
+#endif
+		else
+		{
+			r->e.ip.dst = dest->address.v4;
+			r->e.ip.dmsk = dest->mask.v4;
+
+			r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
+
+			if (dest->invert)
+				r->e.ip.invflags |= IPT_INV_DSTIP;
+		}
+	}
+}
+
+void
+fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
+                         struct fw3_port *sp, struct fw3_port *dp)
+{
+	char buf[sizeof("65535:65535")];
+
+	if ((!sp || !sp->set) && (!dp || !dp->set))
+		return;
+
+	if (!get_protoname(r))
+		return;
+
+	if (sp && sp->set)
+	{
+		if (sp->port_min == sp->port_max)
+			snprintf(buf, sizeof(buf), "%u", sp->port_min);
+		else
+			snprintf(buf, sizeof(buf), "%u:%u", sp->port_min, sp->port_max);
+
+		fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
+	}
+
+	if (dp && dp->set)
+	{
+		if (dp->port_min == dp->port_max)
+			snprintf(buf, sizeof(buf), "%u", dp->port_min);
+		else
+			snprintf(buf, sizeof(buf), "%u:%u", dp->port_min, dp->port_max);
+
+		fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
+	}
+}
+
+void
+fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
+{
+	struct fw3_device dev = { .any = false };
+
+	if (device) {
+		snprintf(dev.name, sizeof(dev.name), "%s", device);
+		fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
+	}
+}
+
+void
+fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
+{
+	char buf[sizeof("ff:ff:ff:ff:ff:ff")];
+	uint8_t *addr = mac->mac.ether_addr_octet;
+
+	if (!mac)
+		return;
+
+	snprintf(buf, sizeof(buf), "%02x:%02x:%02x:%02x:%02x:%02x",
+	         addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
+
+	fw3_ipt_rule_addarg(r, false, "-m", "mac");
+	fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
+}
+
+void
+fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
+{
+	char buf[sizeof("255/255")];
+
+	if (!icmp)
+		return;
+
+#ifndef DISABLE_IPV6
+	if (r->h->family == FW3_FAMILY_V6)
+	{
+		if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
+			snprintf(buf, sizeof(buf), "%u", icmp->type6);
+		else
+			snprintf(buf, sizeof(buf), "%u/%u", icmp->type6, icmp->code6_min);
+
+		fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
+	}
+	else
+#endif
+	{
+		if (icmp->code_min == 0 && icmp->code_max == 0xFF)
+			snprintf(buf, sizeof(buf), "%u", icmp->type);
+		else
+			snprintf(buf, sizeof(buf), "%u/%u", icmp->type, icmp->code_min);
+
+		fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
+	}
+}
+
+void
+fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
+{
+	char buf[sizeof("-4294967296/second")];
+
+	if (!limit || limit->rate <= 0)
+		return;
+
+	fw3_ipt_rule_addarg(r, false, "-m", "limit");
+
+	snprintf(buf, sizeof(buf), "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
+	fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
+
+	if (limit->burst > 0)
+	{
+		snprintf(buf, sizeof(buf), "%u", limit->burst);
+		fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
+	}
+}
+
+void
+fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
+{
+	char buf[sizeof("dst,dst,dst")];
+	char *p = buf;
+	int i = 0, len;
+	size_t rem = sizeof(buf);
+
+	struct fw3_ipset *set;
+	struct fw3_ipset_datatype *type;
+
+	if (!match || !match->set || !match->ptr)
+		return;
+
+	set = match->ptr;
+	list_for_each_entry(type, &set->datatypes, list)
+	{
+		if (i >= 3)
+			break;
+
+		if (p > buf) {
+			if (rem <= 1)
+				break;
+
+			*p++ = ',';
+			*p = 0;
+			rem--;
+		}
+
+		len = snprintf(p, rem, "%s", match->dir[i] ? match->dir[i] : type->dir);
+
+		if (len < 0 || len >= rem)
+			break;
+
+		rem -= len;
+		p += len;
+
+		i++;
+	}
+
+	fw3_ipt_rule_addarg(r, false, "-m", "set");
+
+	fw3_ipt_rule_addarg(r, match->invert, "--match-set",
+	                    set->external ? set->external : set->name);
+
+	fw3_ipt_rule_addarg(r, false, buf, NULL);
+}
+
+void
+fw3_ipt_rule_helper(struct fw3_ipt_rule *r, struct fw3_cthelpermatch *match)
+{
+	if (!match || !match->set || !match->ptr)
+		return;
+
+	fw3_ipt_rule_addarg(r, false, "-m", "helper");
+	fw3_ipt_rule_addarg(r, match->invert, "--helper", match->ptr->name);
+}
+
+void
+fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
+{
+	int i, len;
+	struct tm empty = { 0 };
+
+	char buf[84]; /* sizeof("1,2,3,...,30,31") */
+	char *p;
+
+	bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
+	bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
+
+	size_t rem;
+
+	if (!d1 && !d2 && !time->timestart && !time->timestop &&
+	    !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
+	{
+		return;
+	}
+
+	fw3_ipt_rule_addarg(r, false, "-m", "time");
+
+	if (!time->utc)
+		fw3_ipt_rule_addarg(r, false, "--kerneltz", NULL);
+
+	if (d1)
+	{
+		strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
+		fw3_ipt_rule_addarg(r, false, "--datestart", buf);
+	}
+
+	if (d2)
+	{
+		strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
+		fw3_ipt_rule_addarg(r, false, "--datestop", buf);
+	}
+
+	if (time->timestart)
+	{
+		snprintf(buf, sizeof(buf), "%02d:%02d:%02d",
+		        time->timestart / 3600,
+		        time->timestart % 3600 / 60,
+		        time->timestart % 60);
+
+		fw3_ipt_rule_addarg(r, false, "--timestart", buf);
+	}
+
+	if (time->timestop)
+	{
+		snprintf(buf, sizeof(buf), "%02d:%02d:%02d",
+		        time->timestop / 3600,
+		        time->timestop % 3600 / 60,
+		        time->timestop % 60);
+
+		fw3_ipt_rule_addarg(r, false, "--timestop", buf);
+	}
+
+	if (time->monthdays & 0xFFFFFFFE)
+	{
+		for (i = 1, p = buf, rem = sizeof(buf); i < 32; i++)
+		{
+			if (fw3_hasbit(time->monthdays, i))
+			{
+				if (p > buf) {
+					if (rem <= 1)
+						break;
+
+					*p++ = ',';
+					*p = 0;
+					rem--;
+				}
+
+				len = snprintf(p, rem, "%u", i);
+
+				if (len < 0 || len >= rem)
+					break;
+
+				rem -= len;
+				p += len;
+			}
+		}
+
+		fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
+	}
+
+	if (time->weekdays & 0xFE)
+	{
+		for (i = 1, p = buf, rem = sizeof(buf); i < 8; i++)
+		{
+			if (fw3_hasbit(time->weekdays, i))
+			{
+				if (p > buf) {
+					if (rem <= 1)
+						break;
+
+					*p++ = ',';
+					*p = 0;
+					rem--;
+				}
+
+				len = snprintf(p, rem, "%u", i);
+
+				if (len < 0 || len >= rem)
+					break;
+
+				rem -= len;
+				p += len;
+			}
+		}
+
+		fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
+	}
+}
+
+void
+fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
+{
+	char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF")];
+
+	if (!mark || !mark->set)
+		return;
+
+	if (mark->mask < 0xFFFFFFFF)
+		snprintf(buf, sizeof(buf), "0x%x/0x%x", mark->mark, mark->mask);
+	else
+		snprintf(buf, sizeof(buf), "0x%x", mark->mark);
+
+	fw3_ipt_rule_addarg(r, false, "-m", "mark");
+	fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
+}
+
+void
+fw3_ipt_rule_dscp(struct fw3_ipt_rule *r, struct fw3_dscp *dscp)
+{
+	char buf[sizeof("0xFF")];
+
+	if (!dscp || !dscp->set)
+		return;
+
+	snprintf(buf, sizeof(buf), "0x%x", dscp->dscp);
+
+	fw3_ipt_rule_addarg(r, false, "-m", "dscp");
+	fw3_ipt_rule_addarg(r, dscp->invert, "--dscp", buf);
+}
+
+void
+fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
+{
+	va_list ap;
+	char buf[256];
+
+	if (!fmt || !*fmt)
+		return;
+
+	va_start(ap, fmt);
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	va_end(ap);
+
+	fw3_ipt_rule_addarg(r, false, "-m", "comment");
+	fw3_ipt_rule_addarg(r, false, "--comment", buf);
+}
+
+void
+fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
+{
+	char *p, **tmp, *s;
+
+	if (!extra || !*extra)
+		return;
+
+	s = fw3_strdup(extra);
+
+	for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
+	{
+		tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
+
+		if (!tmp)
+			break;
+
+		r->argv = tmp;
+		r->argv[r->argc++] = fw3_strdup(p);
+	}
+
+	free(s);
+}
+
+#ifndef DISABLE_IPV6
+static void
+rule_print6(struct ip6t_entry *e)
+{
+	char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
+	char *pname;
+
+	if (e->ipv6.flags & IP6T_F_PROTO)
+	{
+		if (e->ipv6.invflags & XT_INV_PROTO)
+			printf(" !");
+
+		pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
+
+		if (pname)
+			printf(" -p %s", pname);
+		else
+			printf(" -p %u", e->ipv6.proto);
+	}
+
+	if (e->ipv6.iniface[0])
+	{
+		if (e->ipv6.invflags & IP6T_INV_VIA_IN)
+			printf(" !");
+
+		printf(" -i %s", e->ipv6.iniface);
+	}
+
+	if (e->ipv6.outiface[0])
+	{
+		if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
+			printf(" !");
+
+		printf(" -o %s", e->ipv6.outiface);
+	}
+
+	if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
+	{
+		if (e->ipv6.invflags & IP6T_INV_SRCIP)
+			printf(" !");
+
+		printf(" -s %s/%s",
+		       inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
+		       inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
+	}
+
+	if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
+	{
+		if (e->ipv6.invflags & IP6T_INV_DSTIP)
+			printf(" !");
+
+		printf(" -d %s/%s",
+		       inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
+		       inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
+	}
+}
+#endif
+
+static void
+rule_print4(struct ipt_entry *e)
+{
+	struct in_addr in_zero = { 0 };
+	char buf1[sizeof("255.255.255.255")], buf2[sizeof("255.255.255.255")];
+	char *pname;
+
+	if (e->ip.proto)
+	{
+		if (e->ip.invflags & XT_INV_PROTO)
+			printf(" !");
+
+		pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
+
+		if (pname)
+			printf(" -p %s", pname);
+		else
+			printf(" -p %u", e->ip.proto);
+	}
+
+	if (e->ip.iniface[0])
+	{
+		if (e->ip.invflags & IPT_INV_VIA_IN)
+			printf(" !");
+
+		printf(" -i %s", e->ip.iniface);
+	}
+
+	if (e->ip.outiface[0])
+	{
+		if (e->ip.invflags & IPT_INV_VIA_OUT)
+			printf(" !");
+
+		printf(" -o %s", e->ip.outiface);
+	}
+
+	if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
+	{
+		if (e->ip.invflags & IPT_INV_SRCIP)
+			printf(" !");
+
+		printf(" -s %s/%s",
+		       inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
+		       inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
+	}
+
+	if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
+	{
+		if (e->ip.invflags & IPT_INV_DSTIP)
+			printf(" !");
+
+		printf(" -d %s/%s",
+		       inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
+		       inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
+	}
+}
+
+static void
+rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
+{
+	debug(r->h, "%s %s", prefix, chain);
+
+#ifndef DISABLE_IPV6
+	if (r->h->family == FW3_FAMILY_V6)
+		rule_print6(&r->e6);
+	else
+#endif
+		rule_print4(&r->e);
+
+	fw3_xt_print_matches(&r->e.ip, r->matches);
+	fw3_xt_print_target(&r->e.ip, r->target);
+
+	printf("\n");
+}
+
+static bool
+parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
+{
+	struct xtables_rule_match *m;
+	struct xtables_match *em;
+
+	/* is a target option */
+	if (r->target && fw3_xt_has_target_parse(r->target) &&
+		optc >= r->target->option_offset &&
+		optc < (r->target->option_offset + 256))
+	{
+		xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
+		return false;
+	}
+
+	/* try to dispatch argument to one of the match parsers */
+	for (m = r->matches; m; m = m->next)
+	{
+		em = m->match;
+
+		if (m->completed || !fw3_xt_has_match_parse(em))
+			continue;
+
+		if (optc < em->option_offset ||
+			optc >= (em->option_offset + 256))
+			continue;
+
+		xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
+		return false;
+	}
+
+	/* unhandled option, might belong to a protocol match */
+	if ((em = load_protomatch(r)) != NULL)
+	{
+		init_match(r, em, false);
+
+		r->protocol_loaded = true;
+		optind--;
+
+		return true;
+	}
+
+	if (optc == ':')
+		warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
+
+	if (optc == '?')
+		warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
+
+	return false;
+}
+
+void
+fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
+                    const char *k, const char *v)
+{
+	int n;
+	char **tmp;
+
+	if (!k)
+		return;
+
+	n = inv + !!k + !!v;
+	tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
+
+	if (!tmp)
+		return;
+
+	r->argv = tmp;
+
+	if (inv)
+		r->argv[r->argc++] = fw3_strdup("!");
+
+	r->argv[r->argc++] = fw3_strdup(k);
+
+	if (v)
+		r->argv[r->argc++] = fw3_strdup(v);
+}
+
+static unsigned char *
+rule_mask(struct fw3_ipt_rule *r)
+{
+	size_t s;
+	unsigned char *p, *mask = NULL;
+	struct xtables_rule_match *m;
+
+#define SZ(x) XT_ALIGN(sizeof(struct x))
+
+#ifndef DISABLE_IPV6
+	if (r->h->family == FW3_FAMILY_V6)
+	{
+		s = SZ(ip6t_entry);
+
+		for (m = r->matches; m; m = m->next)
+			s += SZ(ip6t_entry_match) + m->match->size;
+
+		s += SZ(ip6t_entry_target);
+		if (r->target)
+			s += r->target->size;
+
+		mask = fw3_alloc(s);
+		memset(mask, 0xFF, SZ(ip6t_entry));
+		p = mask + SZ(ip6t_entry);
+
+		for (m = r->matches; m; m = m->next)
+		{
+			memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
+			p += SZ(ip6t_entry_match) + m->match->size;
+		}
+
+		memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target ? r->target->userspacesize : 0));
+	}
+	else
+#endif
+	{
+		s = SZ(ipt_entry);
+
+		for (m = r->matches; m; m = m->next)
+			s += SZ(ipt_entry_match) + m->match->size;
+
+		s += SZ(ipt_entry_target);
+		if (r->target)
+			s += r->target->size;
+
+		mask = fw3_alloc(s);
+		memset(mask, 0xFF, SZ(ipt_entry));
+		p = mask + SZ(ipt_entry);
+
+		for (m = r->matches; m; m = m->next)
+		{
+			memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
+			p += SZ(ipt_entry_match) + m->match->size;
+		}
+
+		memset(p, 0xFF, SZ(ipt_entry_target) + (r->target ? r->target->userspacesize : 0));
+	}
+
+	return mask;
+}
+
+static void *
+rule_build(struct fw3_ipt_rule *r)
+{
+	size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
+	struct xtables_rule_match *m;
+
+#ifndef DISABLE_IPV6
+	if (r->h->family == FW3_FAMILY_V6)
+	{
+		struct ip6t_entry *e6;
+
+		s = XT_ALIGN(sizeof(struct ip6t_entry));
+
+		for (m = r->matches; m; m = m->next)
+			s += m->match->m->u.match_size;
+
+		e6 = fw3_alloc(s + target_size);
+
+		memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
+
+		e6->target_offset = s;
+		e6->next_offset = s + target_size;
+
+		s = 0;
+
+		for (m = r->matches; m; m = m->next)
+		{
+			memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
+			s += m->match->m->u.match_size;
+		}
+
+		if (target_size)
+			memcpy(e6->elems + s, r->target->t, target_size);
+
+		return e6;
+	}
+	else
+#endif
+	{
+		struct ipt_entry *e;
+
+		s = XT_ALIGN(sizeof(struct ipt_entry));
+
+		for (m = r->matches; m; m = m->next)
+			s += m->match->m->u.match_size;
+
+		e = fw3_alloc(s + target_size);
+
+		memcpy(e, &r->e, sizeof(struct ipt_entry));
+
+		e->target_offset = s;
+		e->next_offset = s + target_size;
+
+		s = 0;
+
+		for (m = r->matches; m; m = m->next)
+		{
+			memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
+			s += m->match->m->u.match_size;
+		}
+
+		if (target_size)
+			memcpy(e->elems + s, r->target->t, target_size);
+
+		return e;
+	}
+}
+
+static void
+set_rule_tag(struct fw3_ipt_rule *r)
+{
+	int i;
+	char *p, **tmp;
+	const char *tag = "!fw3";
+
+	for (i = 0; i < r->argc; i++)
+		if (!strcmp(r->argv[i], "--comment") && (i + 1) < r->argc)
+			if (asprintf(&p, "%s: %s", tag, r->argv[i + 1]) > 0)
+			{
+				free(r->argv[i + 1]);
+				r->argv[i + 1] = p;
+				return;
+			}
+
+	tmp = realloc(r->argv, (r->argc + 4) * sizeof(*r->argv));
+
+	if (tmp)
+	{
+		r->argv = tmp;
+		r->argv[r->argc++] = fw3_strdup("-m");
+		r->argv[r->argc++] = fw3_strdup("comment");
+		r->argv[r->argc++] = fw3_strdup("--comment");
+		r->argv[r->argc++] = fw3_strdup(tag);
+	}
+}
+
+void
+__fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
+{
+	void *rule;
+	unsigned char *mask;
+
+	struct xtables_rule_match *m;
+	struct xtables_match *em;
+	struct xtables_target *et;
+	struct xtables_globals *g;
+
+	struct fw3_device dev;
+	struct fw3_address addr;
+
+	enum xtables_exittype status;
+
+	int i, optc;
+	bool inv = false;
+	char buf[32];
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
+	va_end(ap);
+
+	g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
+	g->opts = g->orig_opts;
+
+	optind = 0;
+	opterr = 0;
+
+	status = setjmp(fw3_ipt_error_jmp);
+
+	if (status > 0)
+	{
+		info("     ! Skipping due to previous exception (code %u)", status);
+		goto free;
+	}
+
+	set_rule_tag(r);
+
+	while ((optc = getopt_long(r->argc, r->argv, "-:m:j:i:o:s:d:", g->opts,
+	                           NULL)) != -1)
+	{
+		switch (optc)
+		{
+		case 'm':
+			em = find_match(r, optarg);
+
+			if (!em)
+			{
+				warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
+				goto free;
+			}
+
+			init_match(r, em, true);
+			break;
+
+		case 'j':
+			et = get_target(r, optarg);
+
+			if (!et)
+			{
+				warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
+				goto free;
+			}
+
+			break;
+
+		case 'i':
+		case 'o':
+			if (!fw3_parse_device(&dev, optarg, false) ||
+			    dev.any || dev.invert || *dev.network)
+			{
+				warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
+				goto free;
+			}
+
+			dev.invert = inv;
+			fw3_ipt_rule_in_out(r, (optc == 'i') ? &dev : NULL,
+			                       (optc == 'o') ? &dev : NULL);
+			break;
+
+		case 's':
+		case 'd':
+			if (!fw3_parse_address(&addr, optarg, false) ||
+			    addr.range || addr.invert)
+			{
+				warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
+				goto free;
+			}
+
+			addr.invert = inv;
+			fw3_ipt_rule_src_dest(r, (optc == 's') ? &addr : NULL,
+			                         (optc == 'd') ? &addr : NULL);
+			break;
+
+		case 1:
+			if ((optarg[0] == '!') && (optarg[1] == '\0'))
+			{
+				optarg[0] = '\0';
+				inv = true;
+				continue;
+			}
+
+			warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
+			goto free;
+
+		default:
+			if (parse_option(r, optc, inv))
+				continue;
+			break;
+		}
+
+		inv = false;
+	}
+
+	for (m = r->matches; m; m = m->next)
+		xtables_option_mfcall(m->match);
+
+	if (r->target)
+		xtables_option_tfcall(r->target);
+
+	rule = rule_build(r);
+
+#ifndef DISABLE_IPV6
+	if (r->h->family == FW3_FAMILY_V6)
+	{
+		if (repl)
+		{
+			mask = rule_mask(r);
+
+			while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
+				if (fw3_pr_debug)
+					rule_print(r, "-D", buf);
+
+			free(mask);
+		}
+
+		if (fw3_pr_debug)
+			rule_print(r, "-A", buf);
+
+		if (!ip6tc_append_entry(buf, rule, r->h->handle))
+			warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
+	}
+	else
+#endif
+	{
+		if (repl)
+		{
+			mask = rule_mask(r);
+
+			while (iptc_delete_entry(buf, rule, mask, r->h->handle))
+				if (fw3_pr_debug)
+					rule_print(r, "-D", buf);
+
+			free(mask);
+		}
+
+		if (fw3_pr_debug)
+			rule_print(r, "-A", buf);
+
+		if (!iptc_append_entry(buf, rule, r->h->handle))
+			warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
+	}
+
+	free(rule);
+
+free:
+	for (i = 1; i < r->argc; i++)
+		free(r->argv[i]);
+
+	free(r->argv);
+
+	xtables_rule_matches_free(&r->matches);
+
+	if (r->target)
+		free(r->target->t);
+
+	free(r);
+
+	/* reset all targets and matches */
+	for (em = xtables_matches; em; em = em->next)
+		em->mflags = 0;
+
+	for (et = xtables_targets; et; et = et->next)
+	{
+		et->tflags = 0;
+		et->used = 0;
+	}
+
+	xtables_free_opts(1);
+}
+
+struct fw3_ipt_rule *
+fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
+                    struct fw3_device *in, struct fw3_device *out,
+                    struct fw3_address *src, struct fw3_address *dest)
+{
+	struct fw3_ipt_rule *r;
+
+	r = fw3_ipt_rule_new(handle);
+
+	fw3_ipt_rule_proto(r, proto);
+	fw3_ipt_rule_in_out(r, in, out);
+	fw3_ipt_rule_src_dest(r, src, dest);
+
+	return r;
+}
+
+void
+xtables_register_match(struct xtables_match *me)
+{
+	int i;
+	static struct xtables_match **tmp;
+
+	if (!xext.register_match)
+		xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
+
+	if (!xext.register_match)
+		return;
+
+	xext.register_match(me);
+
+	if (xext.retain)
+	{
+		for (i = 0; i < xext.mcount; i++)
+			if (xext.matches[i] == me)
+				return;
+
+		tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
+
+		if (!tmp)
+			return;
+
+		xext.matches = tmp;
+		xext.matches[xext.mcount++] = me;
+	}
+}
+
+void
+xtables_register_target(struct xtables_target *me)
+{
+	int i;
+	static struct xtables_target **tmp;
+
+	if (!xext.register_target)
+		xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
+
+	if (!xext.register_target)
+		return;
+
+	xext.register_target(me);
+
+	if (xext.retain)
+	{
+		for (i = 0; i < xext.tcount; i++)
+			if (xext.targets[i] == me)
+				return;
+
+		tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
+
+		if (!tmp)
+			return;
+
+		xext.targets = tmp;
+		xext.targets[xext.tcount++] = me;
+	}
+}