From 2e7377d3e21c0c93219eea0d38e2ee37308f6150 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Sun, 17 Feb 2002 19:54:42 +0000
Subject: add DSCP target support

---
 extensions/libipt_DSCP.c | 140 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 extensions/libipt_DSCP.c

(limited to 'extensions')

diff --git a/extensions/libipt_DSCP.c b/extensions/libipt_DSCP.c
new file mode 100644
index 00000000..4ac8960b
--- /dev/null
+++ b/extensions/libipt_DSCP.c
@@ -0,0 +1,140 @@
+/* Shared library add-on to iptables for DSCP
+ *
+ * (C) 2000- 2002 by Matthew G. Marsh <mgm@paktronix.com>,
+ * 		     Harald Welte <laforge@gnumonks.org>
+ *
+ * This program is distributed under the terms of GNU GPL v2, 1991
+ *
+ * libipt_DSCP.c borrowed heavily from libipt_TOS.c
+ *
+ */
+#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_DSCP.h>
+
+struct finfo {
+ 	struct ipt_entry_target t;
+	u_int8_t dscp;
+};
+
+static void init(struct ipt_entry_target *t, unsigned int *nfcache) 
+{
+}
+
+static void help(void) 
+{
+	printf(
+"DSCP target options\n"
+"  --set-dscp value		Set DSCP field in packet header to value\n"
+"  		                This value can be in decimal (ex: 32)\n"
+"               		or in hex (ex: 0x20)\n"
+);
+}
+
+static struct option opts[] = {
+	{ "set-dscp", 1, 0, 'F' },
+	{ 0 }
+};
+
+static void
+parse_dscp(const unsigned char *s, struct ipt_DSCP_info *finfo)
+{
+	unsigned int dscp;
+       
+	if (string_to_number(s, 0, 255, &dscp) == -1)
+		exit_error(PARAMETER_PROBLEM,
+			   "Invalid dscp `%s'\n", s);
+
+	if (dscp & ~IPT_DSCP_MASK) {
+		exit_error(PARAMETER_PROBLEM,
+			   "DSCP `%d` out of range\n", dscp);
+
+    	finfo->dscp = (u_int8_t )ftos;
+    	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_DSCP_info *finfo
+		= (struct ipt_DSCP_info *)(*target)->data;
+
+	switch (c) {
+	case 'F':
+		if (*flags)
+			exit_error(PARAMETER_PROBLEM,
+			           "DSCP target: Only use --set-dscp ONCE!");
+		parse_dscp(optarg, finfo);
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+static void
+final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+		           "DSCP target: Parameter --set-dscp is required");
+}
+
+static void
+print_dscp(u_int8_t ftos, int numeric)
+{
+ 	printf("0x%02x ", dscp);
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+	const struct ipt_DSCP_info *finfo =
+		(const struct ipt_DSCP_info *)target->data;
+	printf("DSCP set ");
+	print_dscp(finfo->ftos, 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)
+{
+	const struct ipt_DSCP_info *finfo =
+		(const struct ipt_DSCP_info *)target->data;
+
+	printf("--set-dscp 0x%02x ", finfo->ftos);
+}
+
+static
+struct iptables_target dscp
+= { NULL,
+    "DSCP",
+    NETFILTER_VERSION,
+    IPT_ALIGN(sizeof(struct ipt_DSCP_info)),
+    IPT_ALIGN(sizeof(struct ipt_DSCP_info)),
+    &help,
+    &init,
+    &parse,
+    &final_check,
+    &print,
+    &save,
+    opts
+};
+
+void _init(void)
+{
+	register_target(&dscp);
+}
-- 
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