From 469d18f66896ef509cac5a2ade494ea38e0c86e2 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Thu, 26 Jan 2006 14:43:52 +0000
Subject: Add 'copy+paste' support for 'state' and 'connmark' match, as well as
 'CONNMARK' target for ip6tables / nf_conntrack_l3proto_ipv6.  This is a
 temporary solution for the iptables-1.3.x branch, since the 1.4.x branch will
 have proper support.

---
 extensions/libip6t_connmark.c | 151 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 extensions/libip6t_connmark.c

(limited to 'extensions/libip6t_connmark.c')

diff --git a/extensions/libip6t_connmark.c b/extensions/libip6t_connmark.c
new file mode 100644
index 00000000..419da304
--- /dev/null
+++ b/extensions/libip6t_connmark.c
@@ -0,0 +1,151 @@
+/* Shared library add-on to iptables to add connmark matching support.
+ *
+ * (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * Version 1.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <ip6tables.h>
+#include "../include/linux/netfilter_ipv4/ipt_connmark.h"
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+	printf(
+"CONNMARK 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}
+};
+
+/* Initialize the match. */
+static void
+init(struct ip6t_entry_match *m, unsigned int *nfcache)
+{
+	/* Can't cache this. */
+	*nfcache |= NFC_UNKNOWN;
+}
+
+/* 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 struct ip6t_entry *entry,
+      unsigned int *nfcache,
+      struct ip6t_entry_match **match)
+{
+	struct ipt_connmark_info *markinfo = (struct ipt_connmark_info *)(*match)->data;
+
+	switch (c) {
+		char *end;
+	case '1':
+		check_inverse(optarg, &invert, &optind, 0);
+
+		markinfo->mark = strtoul(optarg, &end, 0);
+		markinfo->mask = 0xffffffffUL;
+		
+		if (*end == '/')
+			markinfo->mask = strtoul(end+1, &end, 0);
+
+		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 != 0xffffffffUL)
+		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 struct ip6t_ip6 *ip,
+      const struct ip6t_entry_match *match,
+      int numeric)
+{
+	struct ipt_connmark_info *info = (struct ipt_connmark_info *)match->data;
+
+	printf("CONNMARK match ");
+	if (info->invert)
+		printf("!");
+	print_mark(info->mark, info->mask, numeric);
+}
+
+/* Saves the matchinfo in parsable form to stdout. */
+static void
+save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
+{
+	struct ipt_connmark_info *info = (struct ipt_connmark_info *)match->data;
+
+	if (info->invert)
+		printf("! ");
+
+	printf("--mark ");
+	print_mark(info->mark, info->mask, 0);
+}
+
+static struct ip6tables_match connmark_match = {
+    .name          = "connmark",
+    .version       = IPTABLES_VERSION,
+    .size          = IP6T_ALIGN(sizeof(struct ipt_connmark_info)),
+    .userspacesize = IP6T_ALIGN(sizeof(struct ipt_connmark_info)),
+    .help          = &help,
+    .init          = &init,
+    .parse         = &parse,
+    .final_check   = &final_check,
+    .print         = &print,
+    .save          = &save,
+    .extra_opts    = opts
+};
+
+void _init(void)
+{
+	register_match6(&connmark_match);
+}
-- 
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