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/*

 * net/sched/em_u32.c   U32 Ematch

 *

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 *

 * Authors:     Thomas Graf <tgraf@suug.ch>

 *              Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>

 *

 * Based on net/sched/cls_u32.c

 */

#include <linux/module.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/skbuff.h>

#include <net/pkt_cls.h>

static int em_u32_match(struct sk_buff *skb, struct tcf_ematch *em,

                        struct tcf_pkt_info *info)

{

        struct tc_u32_key *key = (struct tc_u32_key *) em->data;

        const unsigned char *ptr = skb_network_header(skb);

        if (info) {

                if (info->ptr)

                        ptr = info->ptr;

                ptr += (info->nexthdr & key->offmask);

        }

        ptr += key->off;

        if (!tcf_valid_offset(skb, ptr, sizeof(u32)))

                return 0;

        return !(((*(u32*) ptr)  ^ key->val) & key->mask);

}

static struct tcf_ematch_ops em_u32_ops = {

        .kind     = TCF_EM_U32,

        .datalen  = sizeof(struct tc_u32_key),

        .match    = em_u32_match,

        .owner    = THIS_MODULE,

        .link     = LIST_HEAD_INIT(em_u32_ops.link)

};

static int __init init_em_u32(void)

{

        return tcf_em_register(&em_u32_ops);

}

static void __exit exit_em_u32(void)

{

        tcf_em_unregister(&em_u32_ops);

}

MODULE_LICENSE("GPL");

module_init(init_em_u32);

module_exit(exit_em_u32);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_U32);