From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 net/netfilter/xt_mac.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 net/netfilter/xt_mac.c

(limited to 'net/netfilter/xt_mac.c')

diff --git a/net/netfilter/xt_mac.c b/net/netfilter/xt_mac.c
new file mode 100644
index 0000000000..81649da57b
--- /dev/null
+++ b/net/netfilter/xt_mac.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Kernel module to match MAC address parameters. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/if_ether.h>
+#include <linux/etherdevice.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/netfilter/xt_mac.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: MAC address match");
+MODULE_ALIAS("ipt_mac");
+MODULE_ALIAS("ip6t_mac");
+
+static bool mac_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+	const struct xt_mac_info *info = par->matchinfo;
+	bool ret;
+
+	if (skb->dev == NULL || skb->dev->type != ARPHRD_ETHER)
+		return false;
+	if (skb_mac_header(skb) < skb->head)
+		return false;
+	if (skb_mac_header(skb) + ETH_HLEN > skb->data)
+		return false;
+	ret  = ether_addr_equal(eth_hdr(skb)->h_source, info->srcaddr);
+	ret ^= info->invert;
+	return ret;
+}
+
+static struct xt_match mac_mt_reg __read_mostly = {
+	.name      = "mac",
+	.revision  = 0,
+	.family    = NFPROTO_UNSPEC,
+	.match     = mac_mt,
+	.matchsize = sizeof(struct xt_mac_info),
+	.hooks     = (1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_IN) |
+	             (1 << NF_INET_FORWARD),
+	.me        = THIS_MODULE,
+};
+
+static int __init mac_mt_init(void)
+{
+	return xt_register_match(&mac_mt_reg);
+}
+
+static void __exit mac_mt_exit(void)
+{
+	xt_unregister_match(&mac_mt_reg);
+}
+
+module_init(mac_mt_init);
+module_exit(mac_mt_exit);
-- 
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