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/* 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);