patch-2.3.99-pre2 linux/net/ipv4/netfilter/ipt_mac.c

• Lines: 64
• Date: Fri Mar 17 10:56:20 2000
• Orig file: v2.3.99-pre1/linux/net/ipv4/netfilter/ipt_mac.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre1/linux/net/ipv4/netfilter/ipt_mac.c linux/net/ipv4/netfilter/ipt_mac.c
@@ -0,0 +1,63 @@
+/* Kernel module to match MAC address parameters. */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/if_ether.h>
+
+#include <linux/netfilter_ipv4/ipt_mac.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+EXPORT_NO_SYMBOLS;
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      const void *hdr,
+      u_int16_t datalen,
+      int *hotdrop)
+{
+    const struct ipt_mac_info *info = matchinfo;
+
+    /* Is mac pointer valid? */
+    return (skb->mac.raw >= skb->head
+	    && skb->mac.raw < skb->head + skb->len - ETH_HLEN
+	    /* If so, compare... */
+	    && ((memcmp(skb->mac.ethernet->h_source, info->srcaddr, ETH_ALEN)
+		== 0) ^ info->invert));
+}
+
+static int
+ipt_mac_checkentry(const char *tablename,
+		   const struct ipt_ip *ip,
+		   void *matchinfo,
+		   unsigned int matchsize,
+		   unsigned int hook_mask)
+{
+	if (hook_mask
+	    & ~((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_IN))) {
+		printk("ipt_mac: only valid for PRE_ROUTING or LOCAL_IN.\n");
+		return 0;
+	}
+
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_mac_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match mac_match
+= { { NULL, NULL }, "mac", &match, &ipt_mac_checkentry, THIS_MODULE };
+
+static int __init init(void)
+{
+	return ipt_register_match(&mac_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&mac_match);
+}
+
+module_init(init);
+module_exit(fini);