patch-2.4.20 linux-2.4.20/net/ipv6/netfilter/ip6t_length.c

• Lines: 52
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/net/ipv6/netfilter/ip6t_length.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/net/ipv6/netfilter/ip6t_length.c linux-2.4.20/net/ipv6/netfilter/ip6t_length.c
@@ -0,0 +1,51 @@
+/* Length Match - IPv6 Port */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv6/ip6t_length.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+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 ip6t_length_info *info = matchinfo;
+	u_int16_t pktlen = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
+	
+	return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
+}
+
+static int
+checkentry(const char *tablename,
+           const struct ip6t_ip6 *ip,
+           void *matchinfo,
+           unsigned int matchsize,
+           unsigned int hook_mask)
+{
+	if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_length_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ip6t_match length_match
+= { { NULL, NULL }, "length", &match, &checkentry, NULL, THIS_MODULE };
+
+static int __init init(void)
+{
+	return ip6t_register_match(&length_match);
+}
+
+static void __exit fini(void)
+{
+	ip6t_unregister_match(&length_match);
+}
+
+module_init(init);
+module_exit(fini);