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/* Kernel module to match TOS values. */

#include <linux/module.h>

#include <linux/skbuff.h>

#include <linux/netfilter_ipv4/ipt_tos.h>

#include <linux/netfilter_ipv4/ip_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 ipt_tos_info *info = matchinfo;

        const struct iphdr *iph = skb->nh.iph;

        return (iph->tos == info->tos) ^ info->invert;

}

static int

checkentry(const char *tablename,

           const struct ipt_ip *ip,

           void *matchinfo,

           unsigned int matchsize,

           unsigned int hook_mask)

{

        if (matchsize != IPT_ALIGN(sizeof(struct ipt_tos_info)))

                return 0;

        return 1;

}

static struct ipt_match tos_match

= { { NULL, NULL }, "tos", &match, &checkentry, NULL, THIS_MODULE };

static int __init init(void)

{

        return ipt_register_match(&tos_match);

}

static void __exit fini(void)

{

        ipt_unregister_match(&tos_match);

}

module_init(init);

module_exit(fini);

MODULE_LICENSE("GPL");