From daa1ef354deee764484c1494073b075859701971 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Tue, 19 Jul 2005 21:44:58 +0000
Subject: add NFQUEUE support for ipv4 and ipv6

---
 extensions/libipt_NFQUEUE.c | 113 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 extensions/libipt_NFQUEUE.c

(limited to 'extensions/libipt_NFQUEUE.c')

diff --git a/extensions/libipt_NFQUEUE.c b/extensions/libipt_NFQUEUE.c
new file mode 100644
index 00000000..5fc3e763
--- /dev/null
+++ b/extensions/libipt_NFQUEUE.c
@@ -0,0 +1,113 @@
+/* Shared library add-on to iptables for NFQ
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ *
+ * This program is distributed under the terms of GNU GPL v2, 1991
+ *
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_NFQUEUE.h>
+
+static void init(struct ipt_entry_target *t, unsigned int *nfcache) 
+{
+}
+
+static void help(void) 
+{
+	printf(
+"NFQUEUE target options\n"
+"  --queue-num value		Send packet to QUEUE number <value>.\n"
+"  		                Valid queue numbers are 0-65535\n"
+);
+}
+
+static struct option opts[] = {
+	{ "queue-num", 1, 0, 'F' },
+	{ 0 }
+};
+
+static void
+parse_num(const char *s, struct ipt_NFQ_info *tinfo)
+{
+	unsigned int num;
+       
+	if (string_to_number(s, 0, 65535, &num) == -1)
+		exit_error(PARAMETER_PROBLEM,
+			   "Invalid queue number `%s'\n", s);
+
+    	tinfo->queuenum = num & 0xffff;
+    	return;
+}
+
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry,
+      struct ipt_entry_target **target)
+{
+	struct ipt_NFQ_info *tinfo
+		= (struct ipt_NFQ_info *)(*target)->data;
+
+	switch (c) {
+	case 'F':
+		if (*flags)
+			exit_error(PARAMETER_PROBLEM, "NFQUEUE target: "
+				   "Only use --queue-num ONCE!");
+		parse_num(optarg, tinfo);
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+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)
+{
+	const struct ipt_NFQ_info *tinfo =
+		(const struct ipt_NFQ_info *)target->data;
+	printf("NFQUEUE num %u", tinfo->queuenum);
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+	const struct ipt_NFQ_info *tinfo =
+		(const struct ipt_NFQ_info *)target->data;
+
+	printf("--queue-num %u ", tinfo->queuenum);
+}
+
+static struct iptables_target nfqueue = { 
+	.next		= NULL,
+	.name		= "NFQUEUE",
+	.version	= IPTABLES_VERSION,
+	.size		= IPT_ALIGN(sizeof(struct ipt_NFQ_info)),
+	.userspacesize	= IPT_ALIGN(sizeof(struct ipt_NFQ_info)),
+	.help		= &help,
+	.init		= &init,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts
+};
+
+void _init(void)
+{
+	register_target(&nfqueue);
+}
-- 
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