1 files changed, 151 insertions, 0 deletions
diff --git a/extensions/libipt_POOL.c b/extensions/libipt_POOL.c
new file mode 100644
index 00000000..12d9572d
--- /dev/null
+++ b/extensions/libipt_POOL.c
@@ -0,0 +1,151 @@
+/* Shared library add-on to iptables to add IP pool mangling target. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <ctype.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_nat_rule.h>
+#include <linux/netfilter_ipv4/ip_pool.h>
+#include <linux/netfilter_ipv4/ipt_pool.h>
+
+#include <libippool/ip_pool_support.h>
+
+/* FIXME --RR */
+#include "../ippool/libippool.c"
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+	printf(
+"POOL v%s options:\n"
+" --add-srcip <pool>\n"
+" --del-srcip <pool>\n"
+" --add-dstip <pool>\n"
+" --del-dstip <pool>\n"
+"				add/del src/dst IP from pool.\n\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+	{ "add-srcip", 1, 0, '1' },
+	{ "del-srcip", 1, 0, '2' },
+	{ "add-dstip", 1, 0, '3' },
+	{ "del-dstip", 1, 0, '4' },
+	{ 0 }
+};
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_target *target, unsigned int *nfcache)
+{
+	struct ipt_pool_info *ipi = (struct ipt_pool_info *) target->data;
+
+	ipi->src = ipi->dst = IP_POOL_NONE;
+	ipi->flags = 0;
+
+	/* 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 ipt_entry *entry,
+      struct ipt_entry_target **target)
+{
+	struct ipt_pool_info *ipi = (struct ipt_pool_info *) (*target)->data;
+	switch (c) {
+	case '1':	/* --add-srcip <pool> */
+		ipi->src = ip_pool_get_index(optarg);
+		ipi->flags &= ~IPT_POOL_DEL_SRC;
+		break;
+	case '2':	/* --del-srcip <pool> */
+		ipi->src = ip_pool_get_index(optarg);
+		ipi->flags |= IPT_POOL_DEL_SRC;
+		break;
+	case '3':	/* --add-dstip <pool> */
+		ipi->dst = ip_pool_get_index(optarg);
+		ipi->flags &= ~IPT_POOL_DEL_DST;
+		break;
+	case '4':	/* --del-dstip <pool> */
+		ipi->dst = ip_pool_get_index(optarg);
+		ipi->flags |= IPT_POOL_DEL_DST;
+		break;
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+/* Final check; don't care. */
+static void final_check(unsigned int flags)
+{
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+	char buf[256];
+	struct ipt_pool_info *ipi = (struct ipt_pool_info *) target->data;
+
+	printf("POOL");
+	if (ipi->src != IP_POOL_NONE) {
+		printf(" --%s-srcip %s",
+			(ipi->flags & IPT_POOL_DEL_SRC) ? "del" : "add",
+			ip_pool_get_name(buf, sizeof(buf), ipi->src, numeric));
+	}
+	if (ipi->dst != IP_POOL_NONE) {
+		printf(" --%s-dstip %s",
+			(ipi->flags & IPT_POOL_DEL_DST) ? "del" : "add",
+			ip_pool_get_name(buf, sizeof(buf), ipi->dst, numeric));
+	}
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+	char buf[256];
+	struct ipt_pool_info *ipi = (struct ipt_pool_info *) target->data;
+
+	printf("-j POOL");
+	if (ipi->src != IP_POOL_NONE) {
+		printf(" --%s-srcip %s",
+			(ipi->flags & IPT_POOL_DEL_SRC) ? "del" : "add",
+			ip_pool_get_name(buf, sizeof(buf), ipi->src, 0));
+	}
+	if (ipi->dst != IP_POOL_NONE) {
+		printf(" --%s-dstip %s",
+			(ipi->flags & IPT_POOL_DEL_DST) ? "del" : "add",
+			ip_pool_get_name(buf, sizeof(buf), ipi->dst, 0));
+	}
+}
+
+struct iptables_target ipt_pool_target
+= { NULL,
+    "POOL",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_pool_info)),
+    IPT_ALIGN(sizeof(struct ipt_pool_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_target(&ipt_pool_target);
+}