1 /* Length Match - IPv6 Port */
3 /* (C) 1999-2001 James Morris <jmorros@intercode.com.au>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
11 #include <linux/module.h>
12 #include <linux/skbuff.h>
13 #include <linux/netfilter_ipv6/ip6t_length.h>
14 #include <linux/netfilter_ipv6/ip6_tables.h>
16 MODULE_LICENSE("GPL");
17 MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
18 MODULE_DESCRIPTION("IPv6 packet length match");
21 match(const struct sk_buff *skb,
22 const struct net_device *in,
23 const struct net_device *out,
24 const void *matchinfo,
29 const struct ip6t_length_info *info = matchinfo;
30 u_int16_t pktlen = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
32 return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
36 checkentry(const char *tablename,
37 const struct ip6t_ip6 *ip,
39 unsigned int matchsize,
40 unsigned int hook_mask)
42 if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_length_info)))
48 static struct ip6t_match length_match = {
51 .checkentry = &checkentry,
55 static int __init init(void)
57 return ip6t_register_match(&length_match);
60 static void __exit fini(void)
62 ip6t_unregister_match(&length_match);