From 86c8c13f489128b5df39f5741b2d286b02518a97 Mon Sep 17 00:00:00 2001
From: rusty <rusty>
Date: Mon, 23 Oct 2000 06:41:41 +0000
Subject: BALANCE target alpha support.

---
 extensions/.BALANCE-test    |   2 +
 extensions/libipt_BALANCE.c | 152 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100755 extensions/.BALANCE-test
 create mode 100644 extensions/libipt_BALANCE.c

(limited to 'extensions')

diff --git a/extensions/.BALANCE-test b/extensions/.BALANCE-test
new file mode 100755
index 0000000..3a46d74
--- /dev/null
+++ b/extensions/.BALANCE-test
@@ -0,0 +1,2 @@
+#! /bin/sh
+[ -f $KERNEL_DIR/net/ipv4/netfilter/ipt_BALANCE.c ] && echo BALANCE
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);
+}
-- 
cgit v1.2.3