added libip6t_REJECT.c for IPv6 reject support
diff --git a/extensions/libip6t_REJECT.c b/extensions/libip6t_REJECT.c
new file mode 100644
index 0000000..ab8595d
--- /dev/null
+++ b/extensions/libip6t_REJECT.c
@@ -0,0 +1,172 @@
+/* Shared library add-on to iptables 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 <ip6tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.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()
+{
+ unsigned int i;
+
+ printf("Valid reject types:\n");
+
+ for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++) {
+ printf(" %-25s\t%s\n", reject_table[i].name, reject_table[i].desc);
+ printf(" %-25s\talias\n", reject_table[i].alias);
+ }
+ printf("\n");
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"REJECT options:\n"
+"--reject-with type drop input packet and send back\n"
+" a reply packet according to type:\n");
+
+ print_reject_types();
+}
+
+static struct option opts[] = {
+ { "reject-with", 1, 0, '1' },
+ { 0 }
+};
+
+/* Allocate and initialize the target. */
+static void
+init(struct ip6t_entry_target *t, unsigned int *nfcache)
+{
+ struct ip6t_reject_info *reject = (struct ip6t_reject_info *)t->data;
+
+ /* default */
+ reject->with = IP6T_ICMP6_PORT_UNREACH;
+
+ /* Can't cache this */
+ *nfcache |= NFC_UNKNOWN;
+}
+
+/* Function which parses command options; returns true if it
+ ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+ const struct ip6t_entry *entry,
+ struct ip6t_entry_target **target)
+{
+ struct ip6t_reject_info *reject =
+ (struct ip6t_reject_info *)(*target)->data;
+ unsigned int limit = sizeof(reject_table)/sizeof(struct reject_names);
+ unsigned int i;
+
+ switch(c) {
+ case '1':
+ if (check_inverse(optarg, &invert))
+ exit_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --reject-with");
+ for (i = 0; i < limit; 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;
+ }
+ }
+ exit_error(PARAMETER_PROBLEM, "unknown reject type `%s'",optarg);
+ default:
+ /* Fall through */
+ }
+ return 0;
+}
+
+/* Final check; nothing. */
+static void final_check(unsigned int flags)
+{
+}
+
+/* Prints out ipt_reject_info. */
+static void
+print(const struct ip6t_ip6 *ip,
+ const struct ip6t_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 < sizeof(reject_table)/sizeof(struct reject_names); i++) {
+ if (reject_table[i].with == reject->with)
+ break;
+ }
+ printf("reject-with %s ", reject_table[i].name);
+}
+
+/* Saves ipt_reject in parsable form to stdout. */
+static void save(const struct ip6t_ip6 *ip,
+ const struct ip6t_entry_target *target)
+{
+ const struct ip6t_reject_info *reject
+ = (const struct ip6t_reject_info *)target->data;
+ unsigned int i;
+
+ for (i = 0; i < sizeof(reject_table)/sizeof(struct reject_names); i++)
+ if (reject_table[i].with == reject->with)
+ break;
+
+ printf("--reject-with %s ", reject_table[i].name);
+}
+
+struct ip6tables_target reject
+= { NULL,
+ "REJECT",
+ NETFILTER_VERSION,
+ IP6T_ALIGN(sizeof(struct ip6t_reject_info)),
+ IP6T_ALIGN(sizeof(struct ip6t_reject_info)),
+ &help,
+ &init,
+ &parse,
+ &final_check,
+ &print,
+ &save,
+ opts
+};
+
+void _init(void)
+{
+ register_target6(&reject);
+}