BALANCE target alpha support.
diff --git a/extensions/libipt_BALANCE.c b/extensions/libipt_BALANCE.c
new file mode 100644
index 0000000..abbf1b6
--- /dev/null
+++ b/extensions/libipt_BALANCE.c
@@ -0,0 +1,152 @@
+/* Shared library add-on to iptables to add simple load-balance support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+
+#define BREAKUP_IP(x) (x)>>24, ((x)>>16) & 0xFF, ((x)>>8) & 0xFF, (x) & 0xFF
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"BALANCE v%s options:\n"
+" --to-destination <ipaddr>-<ipaddr>\n"
+" Addresses to map destination to.\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+ { "to-destination", 1, 0, '1' },
+ { 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+ struct ip_nat_multi_range *mr = (struct ip_nat_multi_range *)t->data;
+
+ /* Actually, it's 0, but it's ignored at the moment. */
+ mr->rangesize = 1;
+
+ /* Can't cache this */
+ *nfcache |= NFC_UNKNOWN;
+}
+
+/* Parses range of IPs */
+static void
+parse_to(char *arg, struct ip_nat_range *range)
+{
+ char *dash;
+ struct in_addr *ip;
+
+ range->flags |= IP_NAT_RANGE_MAP_IPS;
+ dash = strchr(arg, '-');
+ if (dash)
+ *dash = '\0';
+ else
+ exit_error(PARAMETER_PROBLEM, "Bad IP range `%s'\n", arg);
+
+ ip = dotted_to_addr(arg);
+ if (!ip)
+ exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n",
+ arg);
+ range->min_ip = ip->s_addr;
+ ip = dotted_to_addr(dash+1);
+ if (!ip)
+ exit_error(PARAMETER_PROBLEM, "Bad IP address `%s'\n",
+ dash+1);
+ range->max_ip = ip->s_addr;
+}
+
+/* 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 ipt_entry *entry,
+ struct ipt_entry_target **target)
+{
+ struct ip_nat_multi_range *mr
+ = (struct ip_nat_multi_range *)(*target)->data;
+
+ switch (c) {
+ case '1':
+ if (check_inverse(optarg, &invert))
+ exit_error(PARAMETER_PROBLEM,
+ "Unexpected `!' after --to-destination");
+
+ parse_to(optarg, &mr->range[0]);
+ *flags = 1;
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+/* Final check; need --to-dest. */
+static void final_check(unsigned int flags)
+{
+ if (!flags)
+ exit_error(PARAMETER_PROBLEM,
+ "BALANCE needs --to-destination");
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+ const struct ipt_entry_target *target,
+ int numeric)
+{
+ struct ip_nat_multi_range *mr
+ = (struct ip_nat_multi_range *)target->data;
+ struct ip_nat_range *r = &mr->range[0];
+ struct in_addr a;
+
+ a.s_addr = r->min_ip;
+
+ printf("balance %s", addr_to_dotted(&a));
+ a.s_addr = r->max_ip;
+ printf("-%s ", addr_to_dotted(&a));
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+ struct ip_nat_multi_range *mr
+ = (struct ip_nat_multi_range *)target->data;
+ struct ip_nat_range *r = &mr->range[0];
+ struct in_addr a;
+
+ a.s_addr = r->min_ip;
+ printf("--to-destination %s", addr_to_dotted(&a));
+ a.s_addr = r->max_ip;
+ printf("-%s ", addr_to_dotted(&a));
+}
+
+struct iptables_target balance
+= { NULL,
+ "BALANCE",
+ NETFILTER_VERSION,
+ IPT_ALIGN(sizeof(struct ip_nat_multi_range)),
+ IPT_ALIGN(sizeof(struct ip_nat_multi_range)),
+ &help,
+ &init,
+ &parse,
+ &final_check,
+ &print,
+ &save,
+ opts
+};
+
+void _init(void)
+{
+ register_target(&balance);
+}