From de9d244eef00ad3633e8a1d303713390ab2e243c Mon Sep 17 00:00:00 2001
From: Yasuyuki KOZAKAI <yasuyuki@netfilter.org>
Date: Tue, 24 Jul 2007 06:55:05 +0000
Subject: Unifies libip[6]_mark.c into libxt_mark.c

---
 extensions/libxt_mark.c | 141 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 extensions/libxt_mark.c

(limited to 'extensions/libxt_mark.c')

diff --git a/extensions/libxt_mark.c b/extensions/libxt_mark.c
new file mode 100644
index 00000000..97771b09
--- /dev/null
+++ b/extensions/libxt_mark.c
@@ -0,0 +1,141 @@
+/* Shared library add-on to iptables to add NFMARK matching support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <xtables.h>
+/* For 64bit kernel / 32bit userspace */
+#include "../include/linux/netfilter/xt_mark.h"
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+	printf(
+"MARK match v%s options:\n"
+"[!] --mark value[/mask]         Match nfmark value with optional mask\n"
+"\n",
+IPTABLES_VERSION);
+}
+
+static struct option opts[] = {
+	{ "mark", 1, 0, '1' },
+	{0}
+};
+
+/* Function which parses command options; returns true if it
+   ate an option */
+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_mark_info *markinfo = (struct xt_mark_info *)(*match)->data;
+
+	switch (c) {
+		char *end;
+	case '1':
+		check_inverse(optarg, &invert, &optind, 0);
+		markinfo->mark = strtoul(optarg, &end, 0);
+		if (*end == '/') {
+			markinfo->mask = strtoul(end+1, &end, 0);
+		} else
+			markinfo->mask = 0xffffffff;
+		if (*end != '\0' || end == optarg)
+			exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
+		if (invert)
+			markinfo->invert = 1;
+		*flags = 1;
+		break;
+
+	default:
+		return 0;
+	}
+	return 1;
+}
+
+static void
+print_mark(unsigned long mark, unsigned long mask, int numeric)
+{
+	if(mask != 0xffffffff)
+		printf("0x%lx/0x%lx ", mark, mask);
+	else
+		printf("0x%lx ", mark);
+}
+
+/* Final check; must have specified --mark. */
+static void
+final_check(unsigned int flags)
+{
+	if (!flags)
+		exit_error(PARAMETER_PROBLEM,
+			   "MARK match: You must specify `--mark'");
+}
+
+/* Prints out the matchinfo. */
+static void
+print(const void *ip,
+      const struct xt_entry_match *match,
+      int numeric)
+{
+	struct xt_mark_info *info = (struct xt_mark_info *)match->data;
+
+	printf("MARK match ");
+
+	if (info->invert)
+		printf("!");
+	
+	print_mark(info->mark, info->mask, numeric);
+}
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void
+save(const void *ip, const struct xt_entry_match *match)
+{
+	struct xt_mark_info *info = (struct xt_mark_info *)match->data;
+
+	if (info->invert)
+		printf("! ");
+	
+	printf("--mark ");
+	print_mark(info->mark, info->mask, 0);
+}
+
+static struct xtables_match mark = { 
+	.next		= NULL,
+	.family		= AF_INET,
+	.name		= "mark",
+	.version	= IPTABLES_VERSION,
+	.size		= XT_ALIGN(sizeof(struct xt_mark_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct xt_mark_info)),
+	.help		= &help,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts
+};
+
+static struct xtables_match mark6 = { 
+	.next		= NULL,
+	.family		= AF_INET6,
+	.name		= "mark",
+	.version	= IPTABLES_VERSION,
+	.size		= XT_ALIGN(sizeof(struct xt_mark_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct xt_mark_info)),
+	.help		= &help,
+	.parse		= &parse,
+	.final_check	= &final_check,
+	.print		= &print,
+	.save		= &save,
+	.extra_opts	= opts
+};
+
+void _init(void)
+{
+	xtables_register_match(&mark);
+	xtables_register_match(&mark6);
+}
-- 
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