Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_mac.c

diff --git a/kernel/net/netfilter/xt_mac.c b/kernel/net/netfilter/xt_mac.c
new file mode 100644 (file)
index 0000000..d5b4fd4
--- /dev/null
+++ b/kernel/net/netfilter/xt_mac.c
@@ -0,0 +1,66 @@
+/* Kernel module to match MAC address parameters. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#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);