X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=src%2Fiptables.c;h=531e93373c810f07ce26650eb6bccce6300d0930;hb=af22afbaf54aaadb85d6df5d60c5b43f37ea5fc0;hp=3f1a92a0148af6faa5a1229f2f71958f63ef8609;hpb=8c62cb26f0513b99e264a4993ce1c25e8e6470d0;p=framework%2Fconnectivity%2Fconnman.git

diff --git a/src/iptables.c b/src/iptables.c
index 3f1a92a..531e933 100644
--- a/src/iptables.c
+++ b/src/iptables.c
@@ -2,7 +2,7 @@
  *
  *  Connection Manager
  *
- *  Copyright (C) 2007-2010  Intel Corporation. All rights reserved.
+ *  Copyright (C) 2007-2012  Intel Corporation. All rights reserved.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
@@ -50,6 +50,8 @@ static const char *hooknames[] = {
 #define LABEL_QUEUE   "QUEUE"
 #define LABEL_RETURN  "RETURN"
 
+#define XT_OPTION_OFFSET_SCALE 256
+
 /* fn returns 0 to continue iteration */
 #define _XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
 ({								\
@@ -59,7 +61,7 @@ static const char *hooknames[] = {
 	type *__entry;						\
 								\
 	for (__i = 0, __n = 0; __i < (size);			\
-	     __i += __entry->next_offset, __n++) { 		\
+	     __i += __entry->next_offset, __n++) {		\
 		__entry = (void *)(entries) + __i;		\
 		if (__n < n)					\
 			continue;				\
@@ -284,13 +286,41 @@ static void update_offsets(struct connman_iptables *table)
 	}
 }
 
+static void update_targets_reference(struct connman_iptables *table,
+				struct connman_iptables_entry *entry_before,
+				struct connman_iptables_entry *modified_entry,
+				gboolean is_removing)
+{
+	struct connman_iptables_entry *tmp;
+	struct xt_standard_target *t;
+	GList *list;
+	int offset;
+
+	offset = modified_entry->entry->next_offset;
+
+	for (list = table->entries; list; list = list->next) {
+		tmp = list->data;
+
+		if (!is_jump(tmp))
+			continue;
+
+		t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
+
+		if (is_removing == TRUE) {
+			if (t->verdict >= entry_before->offset)
+				t->verdict -= offset;
+		} else {
+			if (t->verdict > entry_before->offset)
+				t->verdict += offset;
+		}
+	}
+}
+
 static int iptables_add_entry(struct connman_iptables *table,
 				struct ipt_entry *entry, GList *before,
 					int builtin)
 {
-	GList *list;
-	struct connman_iptables_entry *e, *tmp, *entry_before;
-	struct xt_standard_target *t;
+	struct connman_iptables_entry *e, *entry_before;
 
 	if (table == NULL)
 		return -1;
@@ -315,20 +345,10 @@ static int iptables_add_entry(struct connman_iptables *table,
 	entry_before = before->data;
 
 	/*
-	 * We've just insterted a new entry. All references before it
+	 * We've just appended/insterted a new entry. All references
 	 * should be bumped accordingly.
 	 */
-	for (list = table->entries; list != before; list = list->next) {
-		tmp = list->data;
-
-		if (!is_jump(tmp))
-			continue;
-
-		t = (struct xt_standard_target *)ipt_get_target(tmp->entry);
-
-		if (t->verdict >= entry_before->offset)
-			t->verdict += entry->next_offset;
-	}
+	update_targets_reference(table, entry_before, e, FALSE);
 
 	update_offsets(table);
 
@@ -516,19 +536,17 @@ static int iptables_delete_chain(struct connman_iptables *table, char *name)
 	return 0;
 }
 
-static struct ipt_entry *
-new_rule(struct connman_iptables *table, struct ipt_ip *ip,
+static struct ipt_entry *new_rule(struct ipt_ip *ip,
 		char *target_name, struct xtables_target *xt_t,
-		char *match_name, struct xtables_match *xt_m)
+		struct xtables_rule_match *xt_rm)
 {
+	struct xtables_rule_match *tmp_xt_rm;
 	struct ipt_entry *new_entry;
 	size_t match_size, target_size;
-	int is_builtin = is_builtin_target(target_name);
 
-	if (xt_m)
-		match_size = xt_m->m->u.match_size;
-	else
-		match_size = 0;
+	match_size = 0;
+	for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL; tmp_xt_rm = tmp_xt_rm->next)
+		match_size += tmp_xt_rm->match->m->u.match_size;
 
 	if (xt_t)
 		target_size = ALIGN(xt_t->t->u.target_size);
@@ -545,50 +563,20 @@ new_rule(struct connman_iptables *table, struct ipt_ip *ip,
 	new_entry->target_offset = sizeof(struct ipt_entry) + match_size;
 	new_entry->next_offset = sizeof(struct ipt_entry) + target_size +
 								match_size;
-	if (xt_m) {
-		struct xt_entry_match *entry_match;
 
-		entry_match = (struct xt_entry_match *)new_entry->elems;
-		memcpy(entry_match, xt_m->m, match_size);
+	match_size = 0;
+	for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
+				tmp_xt_rm = tmp_xt_rm->next) {
+		memcpy(new_entry->elems + match_size, tmp_xt_rm->match->m,
+					tmp_xt_rm->match->m->u.match_size);
+		match_size += tmp_xt_rm->match->m->u.match_size;
 	}
 
 	if (xt_t) {
 		struct xt_entry_target *entry_target;
 
-		if (is_builtin) {
-			struct xt_standard_target *target;
-
-			target = (struct xt_standard_target *)(xt_t->t);
-			strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
-			target->verdict = target_to_verdict(target_name);
-		}
-
 		entry_target = ipt_get_target(new_entry);
 		memcpy(entry_target, xt_t->t, target_size);
-	} else {
-		struct connman_iptables_entry *target_rule;
-		struct xt_standard_target *target;
-		GList *chain_head;
-
-		/*
-		 * This is a user defined target, i.e. a chain jump.
-		 * We search for the chain head, and the target verdict
-		 * is the first rule's offset on this chain.
-		 * The offset is from the beginning of the table.
-		 */
-
-		chain_head = find_chain_head(table, target_name);
-		if (chain_head == NULL || chain_head->next == NULL) {
-			g_free(new_entry);
-			return NULL;
-		}
-
-		target_rule = chain_head->next->data;
-
-		target = (struct xt_standard_target *)ipt_get_target(new_entry);
-		strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
-		target->target.u.user.target_size = target_size;
-		target->verdict = target_rule->offset;
 	}
 
 	return new_entry;
@@ -627,8 +615,7 @@ static void update_hooks(struct connman_iptables *table, GList *chain_head,
 static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 				struct ipt_ip *ip, char *chain_name,
 				char *target_name, struct xtables_target *xt_t,
-				char *match_name, struct xtables_match *xt_m,
-				int *builtin)
+				int *builtin, struct xtables_rule_match *xt_rm)
 {
 	GList *chain_tail, *chain_head;
 	struct ipt_entry *new_entry;
@@ -642,7 +629,7 @@ static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 	if (chain_tail == NULL)
 		return NULL;
 
-	new_entry = new_rule(table, ip, target_name, xt_t, match_name, xt_m);
+	new_entry = new_rule(ip, target_name, xt_t, xt_rm);
 	if (new_entry == NULL)
 		return NULL;
 
@@ -667,7 +654,7 @@ static struct ipt_entry *prepare_rule_inclusion(struct connman_iptables *table,
 static int iptables_append_rule(struct connman_iptables *table,
 				struct ipt_ip *ip, char *chain_name,
 				char *target_name, struct xtables_target *xt_t,
-				char *match_name, struct xtables_match *xt_m)
+				struct xtables_rule_match *xt_rm)
 {
 	GList *chain_tail;
 	struct ipt_entry *new_entry;
@@ -680,7 +667,7 @@ static int iptables_append_rule(struct connman_iptables *table,
 		return -EINVAL;
 
 	new_entry = prepare_rule_inclusion(table, ip, chain_name,
-			target_name, xt_t, match_name, xt_m, &builtin);
+					target_name, xt_t, &builtin, xt_rm);
 	if (new_entry == NULL)
 		return -EINVAL;
 
@@ -694,7 +681,7 @@ static int iptables_append_rule(struct connman_iptables *table,
 static int iptables_insert_rule(struct connman_iptables *table,
 				struct ipt_ip *ip, char *chain_name,
 				char *target_name, struct xtables_target *xt_t,
-				char *match_name, struct xtables_match *xt_m)
+				struct xtables_rule_match *xt_rm)
 {
 	struct ipt_entry *new_entry;
 	int builtin = -1, ret;
@@ -705,19 +692,271 @@ static int iptables_insert_rule(struct connman_iptables *table,
 		return -EINVAL;
 
 	new_entry = prepare_rule_inclusion(table, ip, chain_name,
-			target_name, xt_t, match_name, xt_m, &builtin);
+					target_name, xt_t, &builtin, xt_rm);
 	if (new_entry == NULL)
 		return -EINVAL;
 
-	ret = iptables_add_entry(table, new_entry, chain_head->next, builtin);
+	if (builtin == -1)
+		chain_head = chain_head->next;
+
+	ret = iptables_add_entry(table, new_entry, chain_head, builtin);
 	if (ret < 0)
 		g_free(new_entry);
 
 	return ret;
 }
 
-static struct ipt_replace *
-iptables_blob(struct connman_iptables *table)
+static gboolean is_same_ipt_entry(struct ipt_entry *i_e1,
+					struct ipt_entry *i_e2)
+{
+	if (memcmp(&i_e1->ip, &i_e2->ip, sizeof(struct ipt_ip)) != 0)
+		return FALSE;
+
+	if (i_e1->target_offset != i_e2->target_offset)
+		return FALSE;
+
+	if (i_e1->next_offset != i_e2->next_offset)
+		return FALSE;
+
+	return TRUE;
+}
+
+static gboolean is_same_target(struct xt_entry_target *xt_e_t1,
+					struct xt_entry_target *xt_e_t2)
+{
+	if (xt_e_t1 == NULL || xt_e_t2 == NULL)
+		return FALSE;
+
+	if (strcmp(xt_e_t1->u.user.name, IPT_STANDARD_TARGET) == 0) {
+		struct xt_standard_target *xt_s_t1;
+		struct xt_standard_target *xt_s_t2;
+
+		xt_s_t1 = (struct xt_standard_target *) xt_e_t1;
+		xt_s_t2 = (struct xt_standard_target *) xt_e_t2;
+
+		if (xt_s_t1->verdict != xt_s_t2->verdict)
+			return FALSE;
+	} else {
+		if (xt_e_t1->u.target_size != xt_e_t2->u.target_size)
+			return FALSE;
+
+		if (strcmp(xt_e_t1->u.user.name, xt_e_t2->u.user.name) != 0)
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+static gboolean is_same_match(struct xt_entry_match *xt_e_m1,
+				struct xt_entry_match *xt_e_m2)
+{
+	if (xt_e_m1 == NULL || xt_e_m2 == NULL)
+		return FALSE;
+
+	if (xt_e_m1->u.match_size != xt_e_m2->u.match_size)
+		return FALSE;
+
+	if (xt_e_m1->u.user.revision != xt_e_m2->u.user.revision)
+		return FALSE;
+
+	if (strcmp(xt_e_m1->u.user.name, xt_e_m2->u.user.name) != 0)
+		return FALSE;
+
+	return TRUE;
+}
+
+static GList *find_existing_rule(struct connman_iptables *table,
+				struct ipt_ip *ip, char *chain_name,
+				char *target_name, struct xtables_target *xt_t,
+				struct xtables_match *xt_m,
+				struct xtables_rule_match *xt_rm)
+{
+	GList *chain_tail, *chain_head, *list;
+	struct xt_entry_target *xt_e_t = NULL;
+	struct xt_entry_match *xt_e_m = NULL;
+	struct connman_iptables_entry *entry;
+	struct ipt_entry *entry_test;
+	int builtin;
+
+	chain_head = find_chain_head(table, chain_name);
+	if (chain_head == NULL)
+		return NULL;
+
+	chain_tail = find_chain_tail(table, chain_name);
+	if (chain_tail == NULL)
+		return NULL;
+
+	if (!xt_t && !xt_m)
+		return NULL;
+
+	entry_test = new_rule(ip, target_name, xt_t, xt_rm);
+	if (entry_test == NULL)
+		return NULL;
+
+	if (xt_t != NULL)
+		xt_e_t = ipt_get_target(entry_test);
+	if (xt_m != NULL)
+		xt_e_m = (struct xt_entry_match *)entry_test->elems;
+
+	entry = chain_head->data;
+	builtin = entry->builtin;
+
+	if (builtin >= 0)
+		list = chain_head;
+	else
+		list = chain_head->next;
+
+	for (; list != chain_tail->prev; list = list->next) {
+		struct connman_iptables_entry *tmp;
+		struct ipt_entry *tmp_e;
+
+		tmp = list->data;
+		tmp_e = tmp->entry;
+
+		if (is_same_ipt_entry(entry_test, tmp_e) == FALSE)
+			continue;
+
+		if (xt_t != NULL) {
+			struct xt_entry_target *tmp_xt_e_t;
+
+			tmp_xt_e_t = ipt_get_target(tmp_e);
+
+			if (!is_same_target(tmp_xt_e_t, xt_e_t))
+				continue;
+		}
+
+		if (xt_m != NULL) {
+			struct xt_entry_match *tmp_xt_e_m;
+
+			tmp_xt_e_m = (struct xt_entry_match *)tmp_e->elems;
+
+			if (!is_same_match(tmp_xt_e_m, xt_e_m))
+				continue;
+		}
+
+		break;
+	}
+
+	g_free(entry_test);
+
+	if (list != chain_tail->prev)
+		return list;
+
+	return NULL;
+}
+
+static int iptables_delete_rule(struct connman_iptables *table,
+				struct ipt_ip *ip, char *chain_name,
+				char *target_name, struct xtables_target *xt_t,
+				struct xtables_match *xt_m,
+				struct xtables_rule_match *xt_rm)
+{
+	struct connman_iptables_entry *entry;
+	GList *chain_tail, *list;
+	int builtin, removed;
+
+	removed = 0;
+
+	chain_tail = find_chain_tail(table, chain_name);
+	if (chain_tail == NULL)
+		return -EINVAL;
+
+	list = find_existing_rule(table, ip, chain_name, target_name,
+							xt_t, xt_m, xt_rm);
+	if (list == NULL)
+		return -EINVAL;
+
+	entry = list->data;
+	if (entry == NULL)
+		return -EINVAL;
+
+	builtin = entry->builtin;
+
+	/* We have deleted a rule,
+	 * all references should be bumped accordingly */
+	if (list->next != NULL)
+		update_targets_reference(table, list->next->data,
+						list->data, TRUE);
+
+	removed += remove_table_entry(table, entry);
+
+	if (builtin >= 0) {
+		list = list->next;
+		if (list) {
+			entry = list->data;
+			entry->builtin = builtin;
+		}
+
+		table->underflow[builtin] -= removed;
+		for (list = chain_tail; list; list = list->next) {
+			entry = list->data;
+
+			builtin = entry->builtin;
+			if (builtin < 0)
+				continue;
+
+			table->hook_entry[builtin] -= removed;
+			table->underflow[builtin] -= removed;
+		}
+	}
+
+	update_offsets(table);
+
+	return 0;
+}
+
+static int iptables_compare_rule(struct connman_iptables *table,
+				struct ipt_ip *ip, char *chain_name,
+				char *target_name, struct xtables_target *xt_t,
+				struct xtables_match *xt_m,
+				struct xtables_rule_match *xt_rm)
+{
+	struct connman_iptables_entry *entry;
+	GList *found;
+
+	found = find_existing_rule(table, ip, chain_name, target_name,
+							xt_t, xt_m, xt_rm);
+	if (found == NULL)
+		return -EINVAL;
+
+	entry = found->data;
+	if (entry == NULL)
+		return -EINVAL;
+
+	return 0;
+}
+
+
+static int iptables_change_policy(struct connman_iptables *table,
+					char *chain_name, char *policy)
+{
+	GList *chain_head;
+	struct connman_iptables_entry *entry;
+	struct xt_entry_target *target;
+	struct xt_standard_target *t;
+	int verdict;
+
+	verdict = target_to_verdict(policy);
+	if (verdict == 0)
+		return -EINVAL;
+
+	chain_head = find_chain_head(table, chain_name);
+	if (chain_head == NULL)
+		return -EINVAL;
+
+	entry = chain_head->data;
+	if (entry->builtin < 0)
+		return -EINVAL;
+
+	target = ipt_get_target(entry->entry);
+
+	t = (struct xt_standard_target *)target;
+	t->verdict = verdict;
+
+	return 0;
+}
+
+static struct ipt_replace *iptables_blob(struct connman_iptables *table)
 {
 	struct ipt_replace *r;
 	GList *list;
@@ -965,6 +1204,9 @@ static void table_cleanup(struct connman_iptables *table)
 	GList *list;
 	struct connman_iptables_entry *entry;
 
+	if (table == NULL)
+		return;
+
 	close(table->ipt_sock);
 
 	for (list = table->entries; list; list = list->next) {
@@ -982,11 +1224,26 @@ static void table_cleanup(struct connman_iptables *table)
 
 static struct connman_iptables *iptables_init(char *table_name)
 {
-	struct connman_iptables *table;
+	struct connman_iptables *table = NULL;
+	char *module = NULL;
 	socklen_t s;
 
 	DBG("%s", table_name);
 
+	if (xtables_insmod("ip_tables", NULL, TRUE) != 0)
+		return NULL;
+
+	module = g_strconcat("iptable_", table_name, NULL);
+	if (module == NULL)
+		return NULL;
+
+	if (xtables_insmod(module, NULL, TRUE) != 0) {
+		g_free(module);
+		return NULL;
+	}
+
+	g_free(module);
+
 	table = g_hash_table_lookup(table_hash, table_name);
 	if (table != NULL)
 		return table;
@@ -999,7 +1256,7 @@ static struct connman_iptables *iptables_init(char *table_name)
 	if (table->info == NULL)
 		goto err;
 
-	table->ipt_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
+	table->ipt_sock = socket(AF_INET, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_RAW);
 	if (table->ipt_sock < 0)
 		goto err;
 
@@ -1038,7 +1295,6 @@ static struct connman_iptables *iptables_init(char *table_name)
 	return table;
 
 err:
-
 	table_cleanup(table);
 
 	return NULL;
@@ -1046,10 +1302,13 @@ err:
 
 static struct option iptables_opts[] = {
 	{.name = "append",        .has_arg = 1, .val = 'A'},
+	{.name = "compare",       .has_arg = 1, .val = 'C'},
+	{.name = "delete",        .has_arg = 1, .val = 'D'},
 	{.name = "flush-chain",   .has_arg = 1, .val = 'F'},
 	{.name = "insert",        .has_arg = 1, .val = 'I'},
 	{.name = "list",          .has_arg = 2, .val = 'L'},
 	{.name = "new-chain",     .has_arg = 1, .val = 'N'},
+	{.name = "policy",        .has_arg = 1, .val = 'P'},
 	{.name = "delete-chain",  .has_arg = 1, .val = 'X'},
 	{.name = "destination",   .has_arg = 1, .val = 'd'},
 	{.name = "in-interface",  .has_arg = 1, .val = 'i'},
@@ -1067,18 +1326,197 @@ struct xtables_globals iptables_globals = {
 	.orig_opts = iptables_opts,
 };
 
+static struct xtables_target *prepare_target(struct connman_iptables *table,
+							char *target_name)
+{
+	struct xtables_target *xt_t = NULL;
+	gboolean is_builtin, is_user_defined;
+	GList *chain_head = NULL;
+	size_t target_size;
+
+	is_builtin = FALSE;
+	is_user_defined = FALSE;
+
+	if (is_builtin_target(target_name))
+		is_builtin = TRUE;
+	else {
+		chain_head = find_chain_head(table, target_name);
+		if (chain_head != NULL && chain_head->next != NULL)
+			is_user_defined = TRUE;
+	}
+
+	if (is_builtin || is_user_defined)
+		xt_t = xtables_find_target(IPT_STANDARD_TARGET,
+						XTF_LOAD_MUST_SUCCEED);
+	else
+		xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
+
+	if (xt_t == NULL)
+		return NULL;
+
+	target_size = ALIGN(sizeof(struct ipt_entry_target)) + xt_t->size;
+
+	xt_t->t = g_try_malloc0(target_size);
+	if (xt_t->t == NULL)
+		return NULL;
+
+	xt_t->t->u.target_size = target_size;
+
+	if (is_builtin || is_user_defined) {
+		struct xt_standard_target *target;
+
+		target = (struct xt_standard_target *)(xt_t->t);
+		strcpy(target->target.u.user.name, IPT_STANDARD_TARGET);
+
+		if (is_builtin == TRUE)
+			target->verdict = target_to_verdict(target_name);
+		else if (is_user_defined == TRUE) {
+			struct connman_iptables_entry *target_rule;
+
+			if (chain_head == NULL) {
+				g_free(xt_t->t);
+				return NULL;
+			}
+
+			target_rule = chain_head->next->data;
+			target->verdict = target_rule->offset;
+		}
+	} else {
+		strcpy(xt_t->t->u.user.name, target_name);
+		xt_t->t->u.user.revision = xt_t->revision;
+		if (xt_t->init != NULL)
+			xt_t->init(xt_t->t);
+	}
+
+#if XTABLES_VERSION_CODE > 5
+	if (xt_t->x6_options != NULL)
+		iptables_globals.opts =
+			xtables_options_xfrm(
+				iptables_globals.orig_opts,
+				iptables_globals.opts,
+				xt_t->x6_options,
+				&xt_t->option_offset);
+	else
+#endif
+		iptables_globals.opts =
+			xtables_merge_options(
+#if XTABLES_VERSION_CODE > 5
+				iptables_globals.orig_opts,
+#endif
+				iptables_globals.opts,
+				xt_t->extra_opts,
+				&xt_t->option_offset);
+
+	if (iptables_globals.opts == NULL) {
+		g_free(xt_t->t);
+		xt_t = NULL;
+	}
+
+	return xt_t;
+}
+
+static struct xtables_match *prepare_matches(struct connman_iptables *table,
+			struct xtables_rule_match **xt_rm, char *match_name)
+{
+	struct xtables_match *xt_m;
+	size_t match_size;
+
+	if (match_name == NULL)
+		return NULL;
+
+	xt_m = xtables_find_match(match_name, XTF_LOAD_MUST_SUCCEED, xt_rm);
+	match_size = ALIGN(sizeof(struct ipt_entry_match)) + xt_m->size;
+
+	xt_m->m = g_try_malloc0(match_size);
+	if (xt_m->m == NULL)
+		return NULL;
+
+	xt_m->m->u.match_size = match_size;
+	strcpy(xt_m->m->u.user.name, xt_m->name);
+	xt_m->m->u.user.revision = xt_m->revision;
+
+	if (xt_m->init != NULL)
+		xt_m->init(xt_m->m);
+
+	if (xt_m == xt_m->next)
+		goto done;
+
+#if XTABLES_VERSION_CODE > 5
+	if (xt_m->x6_options != NULL)
+		iptables_globals.opts =
+			xtables_options_xfrm(
+				iptables_globals.orig_opts,
+				iptables_globals.opts,
+				xt_m->x6_options,
+				&xt_m->option_offset);
+	else
+#endif
+			iptables_globals.opts =
+			xtables_merge_options(
+#if XTABLES_VERSION_CODE > 5
+				iptables_globals.orig_opts,
+#endif
+				iptables_globals.opts,
+				xt_m->extra_opts,
+				&xt_m->option_offset);
+
+	if (iptables_globals.opts == NULL) {
+		g_free(xt_m->m);
+		xt_m = NULL;
+	}
+
+done:
+	return xt_m;
+}
+
+static int parse_ip_and_mask(const char *str, struct in_addr *ip, struct in_addr *mask)
+{
+	char **tokens;
+	uint32_t prefixlength;
+	uint32_t tmp;
+	int err;
+
+	tokens = g_strsplit(str, "/", 2);
+	if (tokens == NULL)
+		return -1;
+
+	if (!inet_pton(AF_INET, tokens[0], ip)) {
+		err = -1;
+		goto out;
+	}
+
+	if (tokens[1] != NULL) {
+		prefixlength = strtol(tokens[1], NULL, 10);
+		if (prefixlength > 31) {
+			err = -1;
+			goto out;
+		}
+
+		tmp = ~(0xffffffff >> prefixlength);
+	} else {
+		tmp = 0xffffffff;
+	}
+
+	mask->s_addr = htonl(tmp);
+	ip->s_addr = ip->s_addr & mask->s_addr;
+	err = 0;
+out:
+	g_strfreev(tokens);
+
+	return err;
+}
+
 static int iptables_command(int argc, char *argv[])
 {
 	struct connman_iptables *table;
-	struct xtables_match *xt_m;
+	struct xtables_rule_match *xt_rm, *tmp_xt_rm;
+	struct xtables_match *xt_m, *xt_m_t;
 	struct xtables_target *xt_t;
 	struct ipt_ip ip;
 	char *table_name, *chain, *new_chain, *match_name, *target_name;
-	char *flush_chain, *delete_chain;
+	char *flush_chain, *delete_chain, *policy;
 	int c, ret, in_len, out_len;
-	size_t size;
-	gboolean dump, invert, insert;
-	struct in_addr src, dst;
+	gboolean dump, invert, insert, delete, compare;
 
 	if (argc == 0)
 		return -EINVAL;
@@ -1086,25 +1524,50 @@ static int iptables_command(int argc, char *argv[])
 	dump = FALSE;
 	invert = FALSE;
 	insert = FALSE;
-	table_name = chain = new_chain = match_name = target_name = NULL;
-	flush_chain = delete_chain = NULL;
+	delete = FALSE;
+	compare = FALSE;
+	chain = new_chain = match_name = target_name = NULL;
+	flush_chain = delete_chain = policy = NULL;
 	memset(&ip, 0, sizeof(struct ipt_ip));
 	table = NULL;
+	xt_rm = NULL;
 	xt_m = NULL;
 	xt_t = NULL;
 	ret = 0;
 
+	/* extension's options will generate false-positives errors */
+	opterr = 0;
+
 	optind = 0;
 
-	while ((c = getopt_long(argc, argv, "-A:F:I:L::N:X:d:j:i:m:o:s:t:",
+	while ((c = getopt_long(argc, argv,
+					"-A:C:D:F:I:L::N:P:X:d:j:i:m:o:s:t:",
 					iptables_globals.opts, NULL)) != -1) {
 		switch (c) {
 		case 'A':
-			/* It is either -A, -D or -I at once */
+			/* It is either -A, -C, -D or -I at once */
+			if (chain)
+				goto out;
+
+			chain = optarg;
+			break;
+
+		case 'C':
+			/* It is either -A, -C, -D or -I at once */
 			if (chain)
 				goto out;
 
 			chain = optarg;
+			compare = TRUE;
+			break;
+
+		case 'D':
+			/* It is either -A, -C, -D or -I at once */
+			if (chain)
+				goto out;
+
+			chain = optarg;
+			delete = TRUE;
 			break;
 
 		case 'F':
@@ -1112,7 +1575,7 @@ static int iptables_command(int argc, char *argv[])
 			break;
 
 		case 'I':
-			/* It is either -A, -D or -I at once */
+			/* It is either -A, -C, -D or -I at once */
 			if (chain)
 				goto out;
 
@@ -1128,17 +1591,23 @@ static int iptables_command(int argc, char *argv[])
 			new_chain = optarg;
 			break;
 
+		case 'P':
+			chain = optarg;
+			if (optind < argc)
+				policy = argv[optind++];
+			else
+				goto out;
+
+			break;
+
 		case 'X':
 			delete_chain = optarg;
 			break;
 
 		case 'd':
-			if (!inet_pton(AF_INET, optarg, &dst))
+			if (!parse_ip_and_mask(optarg, &ip.dst, &ip.dmsk))
 				break;
 
-			ip.dst = dst;
-			inet_pton(AF_INET, "255.255.255.255", &ip.dmsk);
-
 			if (invert)
 				ip.invflags |= IPT_INV_DSTIP;
 
@@ -1160,61 +1629,17 @@ static int iptables_command(int argc, char *argv[])
 
 		case 'j':
 			target_name = optarg;
-			xt_t = xtables_find_target(target_name, XTF_TRY_LOAD);
-
+			xt_t = prepare_target(table, target_name);
 			if (xt_t == NULL)
-				break;
-
-			size = ALIGN(sizeof(struct ipt_entry_target)) +
-								xt_t->size;
-
-			xt_t->t = g_try_malloc0(size);
-			if (xt_t->t == NULL)
-				goto out;
-			xt_t->t->u.target_size = size;
-			strcpy(xt_t->t->u.user.name, target_name);
-			xt_t->t->u.user.revision = xt_t->revision;
-			if (xt_t->init != NULL)
-				xt_t->init(xt_t->t);
-			iptables_globals.opts =
-				xtables_merge_options(
-#if XTABLES_VERSION_CODE > 5
-						     iptables_globals.orig_opts,
-#endif
-						     iptables_globals.opts,
-						     xt_t->extra_opts,
-						     &xt_t->option_offset);
-			if (iptables_globals.opts == NULL)
 				goto out;
 
 			break;
 
 		case 'm':
 			match_name = optarg;
-
-			xt_m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, NULL);
-			size = ALIGN(sizeof(struct ipt_entry_match)) +
-								xt_m->size;
-			xt_m->m = g_try_malloc0(size);
+			xt_m = prepare_matches(table, &xt_rm, match_name);
 			if (xt_m == NULL)
 				goto out;
-			xt_m->m->u.match_size = size;
-			strcpy(xt_m->m->u.user.name, xt_m->name);
-			xt_m->m->u.user.revision = xt_m->revision;
-			if (xt_m->init != NULL)
-				xt_m->init(xt_m->m);
-			if (xt_m != xt_m->next) {
-				iptables_globals.opts =
-				xtables_merge_options(
-#if XTABLES_VERSION_CODE > 5
-						iptables_globals.orig_opts,
-#endif
-						iptables_globals.opts,
-						xt_m->extra_opts,
-						&xt_m->option_offset);
-				if (iptables_globals.opts == NULL)
-					goto out;
-			}
 
 			break;
 
@@ -1233,12 +1658,9 @@ static int iptables_command(int argc, char *argv[])
 			break;
 
 		case 's':
-			if (!inet_pton(AF_INET, optarg, &src))
+			if (!parse_ip_and_mask(optarg, &ip.src, &ip.smsk))
 				break;
 
-			ip.src = src;
-			inet_pton(AF_INET, "255.255.255.255", &ip.smsk);
-
 			if (invert)
 				ip.invflags |= IPT_INV_SRCIP;
 
@@ -1246,6 +1668,13 @@ static int iptables_command(int argc, char *argv[])
 
 		case 't':
 			table_name = optarg;
+
+			table = iptables_init(table_name);
+			if (table == NULL) {
+				ret = -EINVAL;
+				goto out;
+			}
+
 			break;
 
 		case 1:
@@ -1261,29 +1690,89 @@ static int iptables_command(int argc, char *argv[])
 			goto out;
 
 		default:
-			if (xt_t == NULL || xt_t->parse == NULL ||
-			    !xt_t->parse(c - xt_t->option_offset, argv, invert,
-					&xt_t->tflags, NULL, &xt_t->t)) {
-				if (xt_m == NULL || xt_m->parse == NULL)
-					break;
+#if XTABLES_VERSION_CODE > 5
+			if (xt_t != NULL && (xt_t->x6_parse != NULL ||
+						xt_t->parse != NULL) &&
+					(c >= (int) xt_t->option_offset &&
+					c < (int) xt_t->option_offset +
+					XT_OPTION_OFFSET_SCALE)) {
+				xtables_option_tpcall(c, argv,
+							invert,	xt_t, NULL);
 
-				xt_m->parse(c - xt_m->option_offset, argv,
-					invert, &xt_m->mflags, NULL, &xt_m->m);
+				break;
 			}
 
+			for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
+						tmp_xt_rm = tmp_xt_rm->next) {
+				xt_m_t = tmp_xt_rm->match;
+
+				if (tmp_xt_rm->completed ||
+						(xt_m_t->x6_parse == NULL &&
+						 xt_m_t->parse == NULL))
+					continue;
+
+				if (c < (int) xt_m_t->option_offset ||
+					c >= (int) xt_m_t->option_offset
+					+ XT_OPTION_OFFSET_SCALE)
+					continue;
+
+				xtables_option_mpcall(c, argv,
+							invert, xt_m_t, NULL);
+
+				break;
+			}
+#else
+			if (xt_t == NULL || xt_t->parse == NULL ||
+				!xt_t->parse(c - xt_t->option_offset,
+				argv, invert, &xt_t->tflags, NULL, &xt_t->t)) {
+
+				for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
+						tmp_xt_rm = tmp_xt_rm->next) {
+					xt_m_t = tmp_xt_rm->match;
+
+					if (tmp_xt_rm->completed ||
+							xt_m_t->parse == NULL)
+						continue;
+
+					if (xt_m->parse(c - xt_m->option_offset,
+						argv, invert, &xt_m->mflags,
+						NULL, &xt_m->m))
+						break;
+				}
+			}
+#endif
 			break;
 		}
 
 		invert = FALSE;
 	}
 
-	if (table_name == NULL)
-		table_name = "filter";
+#if XTABLES_VERSION_CODE > 5
+	for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
+				tmp_xt_rm = tmp_xt_rm->next)
+		xtables_option_mfcall(tmp_xt_rm->match);
+
+	if (xt_t != NULL)
+		xtables_option_tfcall(xt_t);
+#else
+	for (tmp_xt_rm = xt_rm; tmp_xt_rm != NULL;
+				tmp_xt_rm = tmp_xt_rm->next)
+		if (tmp_xt_rm->match->final_check != NULL)
+			tmp_xt_rm->match->final_check(
+					tmp_xt_rm->match->mflags);
+
+	if (xt_t != NULL && xt_t->final_check != NULL)
+		xt_t->final_check(xt_t->tflags);
+#endif
 
-	table = iptables_init(table_name);
 	if (table == NULL) {
-		ret = -EINVAL;
-		goto out;
+		table_name = "filter";
+
+		table = iptables_init(table_name);
+		if (table == NULL) {
+			ret = -EINVAL;
+			goto out;
+		}
 	}
 
 	if (delete_chain != NULL) {
@@ -1322,15 +1811,39 @@ static int iptables_command(int argc, char *argv[])
 	}
 
 	if (chain) {
-		if (target_name == NULL)
-			return -1;
+		if (policy != NULL) {
+			printf("Changing policy of %s to %s\n", chain, policy);
+
+			iptables_change_policy(table, chain, policy);
+
+			goto out;
+		}
+
+		if (xt_t == NULL)
+			goto out;
+
+		if (compare == TRUE) {
+			ret = iptables_compare_rule(table, &ip, chain,
+					target_name, xt_t, xt_m, xt_rm);
+			goto out;
+		}
+
+		if (delete == TRUE) {
+			DBG("Deleting %s to %s (match %s)\n",
+					target_name, chain, match_name);
+
+			ret = iptables_delete_rule(table, &ip, chain,
+					target_name, xt_t, xt_m, xt_rm);
+
+			goto out;
+		}
 
 		if (insert == TRUE) {
 			DBG("Inserting %s to %s (match %s)",
 					target_name, chain, match_name);
 
 			ret = iptables_insert_rule(table, &ip, chain,
-					target_name, xt_t, match_name, xt_m);
+						target_name, xt_t, xt_rm);
 
 			goto out;
 		} else {
@@ -1338,7 +1851,7 @@ static int iptables_command(int argc, char *argv[])
 					target_name, chain, match_name);
 
 			ret = iptables_append_rule(table, &ip, chain,
-					target_name, xt_t, match_name, xt_m);
+						target_name, xt_t, xt_rm);
 
 			goto out;
 		}