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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 !(((*(__be32 *) 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);
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