Add IPv6 support to DSCP target

1 files changed, 180 insertions, 0 deletions

diff --git a/extensions/libxt_DSCP.c b/extensions/libxt_DSCP.c
new file mode 100644
index 0000000..b062c63
--- /dev/null
+++ b/extensions/libxt_DSCP.c
@@ -0,0 +1,180 @@
+/* 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
+ *
+ * --set-class added by Iain Barnes
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <xtables.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_DSCP.h>
+
+/* This is evil, but it's my code - HW*/
+#include "libipt_dscp_helper.c"
+
+
+static void init(struct xt_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"
+"  --set-dscp-class class	Set the DSCP field in packet header to the\n"
+"				value represented by the DiffServ class value.\n"
+"				This class may be EF,BE or any of the CSxx\n"
+"				or AFxx classes.\n"
+"\n"
+"				These two options are mutually exclusive !\n"
+);
+}
+
+static const struct option opts[] = {
+	{ "set-dscp", 1, 0, 'F' },
+	{ "set-dscp-class", 1, 0, 'G' },
+	{ 0 }
+};
+
+static void
+parse_dscp(const char *s, struct xt_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 > XT_DSCP_MAX)
+		exit_error(PARAMETER_PROBLEM,
+			   "DSCP `%d` out of range\n", dscp);
+
+    	dinfo->dscp = (u_int8_t )dscp;
+    	return;
+}
+
+
+static void
+parse_class(const char *s, struct xt_DSCP_info *dinfo)
+{
+	unsigned int dscp = class_to_dscp(s);
+
+	/* Assign the value */
+	dinfo->dscp = (u_int8_t)dscp;
+}
+
+
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const void *entry,
+      struct xt_entry_target **target)
+{
+	struct xt_DSCP_info *dinfo
+		= (struct xt_DSCP_info *)(*target)->data;
+
+	switch (c) {
+	case 'F':
+		if (*flags)
+			exit_error(PARAMETER_PROBLEM,
+			           "DSCP target: Only use --set-dscp ONCE!");
+		parse_dscp(optarg, dinfo);
+		*flags = 1;
+		break;
+	case 'G':
+		if (*flags)
+			exit_error(PARAMETER_PROBLEM,
+				   "DSCP target: Only use --set-dscp-class ONCE!");
+		parse_class(optarg, dinfo);
+		*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 dscp, int numeric)
+{
+ 	printf("0x%02x ", dscp);
+}
+
+/* Prints out the targinfo. */
+static void
+print(const void *ip,
+      const struct xt_entry_target *target,
+      int numeric)
+{
+	const struct xt_DSCP_info *dinfo =
+		(const struct xt_DSCP_info *)target->data;
+	printf("DSCP set ");
+	print_dscp(dinfo->dscp, numeric);
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const void *ip, const struct xt_entry_target *target)
+{
+	const struct xt_DSCP_info *dinfo =
+		(const struct xt_DSCP_info *)target->data;
+
+	printf("--set-dscp 0x%02x ", dinfo->dscp);
+}
+
+static struct xtables_target dscp = { 
+	.family		= AF_INET,
+	.name		= "DSCP",
+	.version	= IPTABLES_VERSION,
+	.size		= XT_ALIGN(sizeof(struct xt_DSCP_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct xt_DSCP_info)),
+	.help		= &help,
+	.init		= &init,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts,
+};
+
+static struct xtables_target dscp6 = { 
+	.family		= AF_INET6,
+	.name		= "DSCP",
+	.version	= IPTABLES_VERSION,
+	.size		= XT_ALIGN(sizeof(struct xt_DSCP_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct xt_DSCP_info)),
+	.help		= &help,
+	.init		= &init,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&dscp);
+	xtables_register_target(&dscp6);
+}