Add IPv6 support to dscp match.

1 files changed, 189 insertions, 0 deletions

diff --git a/extensions/libxt_dscp.c b/extensions/libxt_dscp.c
new file mode 100644
index 00000000..8ca74443
--- /dev/null
+++ b/extensions/libxt_dscp.c
@@ -0,0 +1,189 @@
+/* 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
+ *
+ * --class support added by Iain Barnes
+ * 
+ * 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 <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 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"
+"[!] --dscp-class name		Match the DiffServ class. This value may\n"
+"				be any of the BE,EF, AFxx or CSx classes\n"
+"\n"
+"				These two options are mutually exclusive !\n"
+				, IPTABLES_VERSION
+);
+}
+
+static struct option opts[] = {
+	{ "dscp", 1, 0, 'F' },
+	{ "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,
+      unsigned int *nfcache,
+      struct xt_entry_match **match)
+{
+	struct xt_dscp_info *dinfo
+		= (struct xt_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;
+
+	case 'G':
+		if (*flags)
+			exit_error(PARAMETER_PROBLEM,
+					"DSCP match: Only use --dscp-class ONCE!");
+		check_inverse(optarg, &invert, &optind, 0);
+		parse_class(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 void *ip,
+      const struct xt_entry_match *match,
+      int numeric)
+{
+	const struct xt_dscp_info *dinfo =
+		(const struct xt_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 void *ip, const struct xt_entry_match *match)
+{
+	const struct xt_dscp_info *dinfo =
+		(const struct xt_dscp_info *)match->data;
+
+	printf("--dscp ");
+	print_dscp(dinfo->dscp, dinfo->invert, 1);
+}
+
+static struct xtables_match dscp = { 
+	.next 		= NULL,
+	.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,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts
+};
+
+static struct xtables_match dscp6 = { 
+	.next 		= NULL,
+	.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,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts
+};
+
+void _init(void)
+{
+	xtables_register_match(&dscp);
+	xtables_register_match(&dscp6);
+}