From 487d1d39b6457a4a3aeb2b9dac3b1925a003a3e1 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Thu, 14 Mar 2002 12:22:06 +0000
Subject: add DSCP match

---
 extensions/libipt_dscp.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)
 create mode 100644 extensions/libipt_dscp.c

(limited to 'extensions/libipt_dscp.c')

diff --git a/extensions/libipt_dscp.c b/extensions/libipt_dscp.c
new file mode 100644
index 00000000..db380cea
--- /dev/null
+++ b/extensions/libipt_dscp.c
@@ -0,0 +1,146 @@
+/* Shared library add-on to iptables for DSCP
+ *
+ * (C) 2002 by 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
+ *
+ * For a list of DSCP codepoints see 
+ * http://www.iana.org/assignments/dscp-registry
+ *
+ */
+#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>
+
+static void init(struct ipt_entry_match *m, unsigned int *nfcache) 
+{
+	*nfcache |= NFC_IP_TOS;
+}
+
+static void help(void) 
+{
+	printf(
+"DSCP match v%s options\n"
+"[!] --dscp value		Match DSCP codepoint with numerical value\n"
+"  		                This value can be in decimal (ex: 32)\n"
+"               		or in hex (ex: 0x20)\n", NETFILTER_VERSION
+);
+}
+
+static struct option opts[] = {
+	{ "dscp", 1, 0, 'F' },
+	{ 0 }
+};
+
+static void
+parse_dscp(const unsigned char *s, struct ipt_dscp_info *dinfo)
+{
+	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_MAX)
+		exit_error(PARAMETER_PROBLEM,
+			   "DSCP `%d` out of range\n", dscp);
+
+    	dinfo->dscp = (u_int8_t )dscp;
+    	return;
+}
+
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry,
+      unsigned int *nfcache,
+      struct ipt_entry_match **match)
+{
+	struct ipt_dscp_info *dinfo
+		= (struct ipt_dscp_info *)(*match)->data;
+
+	switch (c) {
+	case 'F':
+		if (*flags)
+			exit_error(PARAMETER_PROBLEM,
+			           "DSCP match: Only use --dscp ONCE!");
+		check_inverse(optarg, &invert, &optind, 0);
+		parse_dscp(argv[optind-1], dinfo);
+		if (invert)
+			dinfo->invert = 1;
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return 1;
+}
+
+static void
+final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+		           "DSCP match: Parameter --dscp is required");
+}
+
+static void
+print_dscp(u_int8_t dscp, int invert, int numeric)
+{
+	if (invert)
+		fputc('!', stdout);
+
+ 	printf("0x%02x ", dscp);
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_match *match,
+      int numeric)
+{
+	const struct ipt_dscp_info *dinfo =
+		(const struct ipt_dscp_info *)match->data;
+	printf("DSCP match ");
+	print_dscp(dinfo->dscp, dinfo->invert, numeric);
+}
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+	const struct ipt_dscp_info *dinfo =
+		(const struct ipt_dscp_info *)match->data;
+
+	printf("--dscp ");
+	print_dscp(dinfo->dscp, dinfo->invert, 1);
+}
+
+static
+struct iptables_match 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_match(&dscp);
+}
-- 
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