From 4e5ed8d8165b3d4a16a6133cfc1b43118a0e2a3d Mon Sep 17 00:00:00 2001
From: Arturo Borrero <arturo.borrero.glez@gmail.com>
Date: Tue, 3 Feb 2015 16:29:35 +0100
Subject: ebtables-compat: add mark target extension

Translate the mark target extension to the xtables-compat environment.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 extensions/libebt_mark.c                    | 191 ++++++++++++++++++++++++++++
 include/linux/netfilter_bridge/ebt_mark_t.h |  23 ++++
 2 files changed, 214 insertions(+)
 create mode 100644 extensions/libebt_mark.c
 create mode 100644 include/linux/netfilter_bridge/ebt_mark_t.h

diff --git a/extensions/libebt_mark.c b/extensions/libebt_mark.c
new file mode 100644
index 00000000..587b4a63
--- /dev/null
+++ b/extensions/libebt_mark.c
@@ -0,0 +1,191 @@
+/* ebt_mark
+ *
+ * Authors:
+ * Bart De Schuymer <bdschuym@pandora.be>
+ *
+ * July, 2002, September 2006
+ *
+ * Adapted by Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
+ * to use libxtables for ebtables-compat in 2015.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <xtables.h>
+#include <linux/netfilter_bridge/ebt_mark_t.h>
+#include "iptables/nft.h"
+#include "iptables/nft-bridge.h"
+
+static int mark_supplied;
+
+#define MARK_TARGET  '1'
+#define MARK_SETMARK '2'
+#define MARK_ORMARK  '3'
+#define MARK_ANDMARK '4'
+#define MARK_XORMARK '5'
+static struct option brmark_opts[] = {
+	{ .name = "mark-target",.has_arg = true,	.val = MARK_TARGET },
+	/* an oldtime messup, we should have always used the scheme
+	 * <extension-name>-<option> */
+	{ .name = "set-mark",	.has_arg = true,	.val = MARK_SETMARK },
+	{ .name = "mark-set",	.has_arg = true,	.val = MARK_SETMARK },
+	{ .name = "mark-or",	.has_arg = true,	.val = MARK_ORMARK },
+	{ .name = "mark-and",	.has_arg = true,	.val = MARK_ANDMARK },
+	{ .name = "mark-xor",	.has_arg = true,	.val = MARK_XORMARK },
+	XT_GETOPT_TABLEEND,
+};
+
+static void brmark_print_help(void)
+{
+	printf(
+	"mark target options:\n"
+	" --mark-set value     : Set nfmark value\n"
+	" --mark-or  value     : Or nfmark with value (nfmark |= value)\n"
+	" --mark-and value     : And nfmark with value (nfmark &= value)\n"
+	" --mark-xor value     : Xor nfmark with value (nfmark ^= value)\n"
+	" --mark-target target : ACCEPT, DROP, RETURN or CONTINUE\n");
+}
+
+static void brmark_init(struct xt_entry_target *target)
+{
+	struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)target->data;
+
+	info->target = EBT_ACCEPT;
+	info->mark = 0;
+	mark_supplied = 0;
+}
+
+#define OPT_MARK_TARGET   0x01
+#define OPT_MARK_SETMARK  0x02
+#define OPT_MARK_ORMARK   0x04
+#define OPT_MARK_ANDMARK  0x08
+#define OPT_MARK_XORMARK  0x10
+
+static int
+brmark_parse(int c, char **argv, int invert, unsigned int *flags,
+	     const void *entry, struct xt_entry_target **target)
+{
+	struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)
+				       (*target)->data;
+	char *end;
+	uint32_t mask;
+
+	switch (c) {
+	case MARK_TARGET:
+		{ unsigned int tmp;
+		EBT_CHECK_OPTION(flags, OPT_MARK_TARGET);
+		if (ebt_fill_target(optarg, &tmp))
+			xtables_error(PARAMETER_PROBLEM,
+				      "Illegal --mark-target target");
+		/* the 4 lsb are left to designate the target */
+		info->target = (info->target & ~EBT_VERDICT_BITS) |
+			       (tmp & EBT_VERDICT_BITS);
+		}
+		return 1;
+	case MARK_SETMARK:
+		EBT_CHECK_OPTION(flags, OPT_MARK_SETMARK);
+		mask = (OPT_MARK_ORMARK|OPT_MARK_ANDMARK|OPT_MARK_XORMARK);
+		if (*flags & mask)
+			xtables_error(PARAMETER_PROBLEM,
+				      "--mark-set cannot be used together with"
+				      " specific --mark option");
+		info->target = (info->target & EBT_VERDICT_BITS) |
+			       MARK_SET_VALUE;
+		break;
+	case MARK_ORMARK:
+		EBT_CHECK_OPTION(flags, OPT_MARK_ORMARK);
+		mask = (OPT_MARK_SETMARK|OPT_MARK_ANDMARK|OPT_MARK_XORMARK);
+		if (*flags & mask)
+			xtables_error(PARAMETER_PROBLEM,
+				      "--mark-or cannot be used together with"
+				      " specific --mark option");
+		info->target = (info->target & EBT_VERDICT_BITS) |
+			       MARK_OR_VALUE;
+		break;
+	case MARK_ANDMARK:
+		EBT_CHECK_OPTION(flags, OPT_MARK_ANDMARK);
+		mask = (OPT_MARK_SETMARK|OPT_MARK_ORMARK|OPT_MARK_XORMARK);
+		if (*flags & mask)
+			xtables_error(PARAMETER_PROBLEM,
+				      "--mark-and cannot be used together with"
+				      " specific --mark option");
+		info->target = (info->target & EBT_VERDICT_BITS) |
+			       MARK_AND_VALUE;
+		break;
+	case MARK_XORMARK:
+		EBT_CHECK_OPTION(flags, OPT_MARK_XORMARK);
+		mask = (OPT_MARK_SETMARK|OPT_MARK_ANDMARK|OPT_MARK_ORMARK);
+		if (*flags & mask)
+			xtables_error(PARAMETER_PROBLEM,
+				      "--mark-xor cannot be used together with"
+				      " specific --mark option");
+		info->target = (info->target & EBT_VERDICT_BITS) |
+			       MARK_XOR_VALUE;
+		break;
+	default:
+		return 0;
+	}
+	/* mutual code */
+	info->mark = strtoul(optarg, &end, 0);
+	if (*end != '\0' || end == optarg)
+		xtables_error(PARAMETER_PROBLEM, "Bad MARK value '%s'",
+			      optarg);
+
+	mark_supplied = 1;
+	return 1;
+}
+
+static void brmark_print(const void *ip, const struct xt_entry_target *target,
+			 int numeric)
+{
+	struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)target->data;
+	int tmp;
+
+	tmp = info->target & ~EBT_VERDICT_BITS;
+	if (tmp == MARK_SET_VALUE)
+		printf("--mark-set");
+	else if (tmp == MARK_OR_VALUE)
+		printf("--mark-or");
+	else if (tmp == MARK_XOR_VALUE)
+		printf("--mark-xor");
+	else if (tmp == MARK_AND_VALUE)
+		printf("--mark-and");
+	else
+		xtables_error(PARAMETER_PROBLEM, "Unknown mark action");
+
+	printf(" 0x%lx", info->mark);
+	tmp = info->target | ~EBT_VERDICT_BITS;
+	printf(" --mark-target %s", ebt_target_name(tmp));
+}
+
+static void brmark_final_check(unsigned int flags)
+{
+	if (mark_supplied == 0)
+		xtables_error(PARAMETER_PROBLEM, "No mark value supplied");
+
+	if (!flags)
+		xtables_error(PARAMETER_PROBLEM,
+			      "You must specify some option");
+}
+
+static struct xtables_target brmark_target = {
+	.name		= "mark",
+	.revision	= 0,
+	.version	= XTABLES_VERSION,
+	.family		= NFPROTO_BRIDGE,
+	.size		= XT_ALIGN(sizeof(struct ebt_mark_t_info)),
+	.userspacesize	= XT_ALIGN(sizeof(struct ebt_mark_t_info)),
+	.help		= brmark_print_help,
+	.init		= brmark_init,
+	.parse		= brmark_parse,
+	.final_check	= brmark_final_check,
+	.print		= brmark_print,
+	.extra_opts	= brmark_opts,
+};
+
+void _init(void)
+{
+	xtables_register_target(&brmark_target);
+}
diff --git a/include/linux/netfilter_bridge/ebt_mark_t.h b/include/linux/netfilter_bridge/ebt_mark_t.h
new file mode 100644
index 00000000..7d5a268a
--- /dev/null
+++ b/include/linux/netfilter_bridge/ebt_mark_t.h
@@ -0,0 +1,23 @@
+#ifndef __LINUX_BRIDGE_EBT_MARK_T_H
+#define __LINUX_BRIDGE_EBT_MARK_T_H
+
+/* The target member is reused for adding new actions, the
+ * value of the real target is -1 to -NUM_STANDARD_TARGETS.
+ * For backward compatibility, the 4 lsb (2 would be enough,
+ * but let's play it safe) are kept to designate this target.
+ * The remaining bits designate the action. By making the set
+ * action 0xfffffff0, the result will look ok for older
+ * versions. [September 2006] */
+#define MARK_SET_VALUE (0xfffffff0)
+#define MARK_OR_VALUE  (0xffffffe0)
+#define MARK_AND_VALUE (0xffffffd0)
+#define MARK_XOR_VALUE (0xffffffc0)
+
+struct ebt_mark_t_info {
+	unsigned long mark;
+	/* EBT_ACCEPT, EBT_DROP, EBT_CONTINUE or EBT_RETURN */
+	int target;
+};
+#define EBT_MARK_TARGET "mark"
+
+#endif
-- 
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