1 files changed, 146 insertions, 0 deletions
diff --git a/extensions/libip6t_REJECT.c b/extensions/libip6t_REJECT.c
new file mode 100644
index 0000000..b8195d7
--- /dev/null
+++ b/extensions/libip6t_REJECT.c
@@ -0,0 +1,146 @@
+/* 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 <stdlib.h>
+#include <getopt.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;
+};
+
+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 option REJECT_opts[] = {
+	{ "reject-with", 1, NULL, '1' },
+	{ .name = NULL }
+};
+
+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 int REJECT_parse(int c, char **argv, int invert, unsigned int *flags,
+                        const void *entry, struct xt_entry_target **target)
+{
+	struct ip6t_reject_info *reject = 
+		(struct ip6t_reject_info *)(*target)->data;
+	unsigned int i;
+
+	switch(c) {
+	case '1':
+		if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
+			xtables_error(PARAMETER_PROBLEM,
+				   "Unexpected `!' after --reject-with");
+		for (i = 0; i < ARRAY_SIZE(reject_table); ++i)
+			if ((strncasecmp(reject_table[i].name, optarg, strlen(optarg)) == 0)
+			    || (strncasecmp(reject_table[i].alias, optarg, strlen(optarg)) == 0)) {
+				reject->with = reject_table[i].with;
+				return 1;
+			}
+		xtables_error(PARAMETER_PROBLEM, "unknown reject type \"%s\"", optarg);
+	default:
+		/* Fall through */
+		break;
+	}
+	return 0;
+}
+
+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,
+	.parse		= REJECT_parse,
+	.print		= REJECT_print,
+	.save		= REJECT_save,
+	.extra_opts	= REJECT_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&reject_tg6_reg);
+}