65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
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/*
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* net/sched/em_u32.c U32 Ematch
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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* Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Based on net/sched/cls_u32.c
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <net/pkt_cls.h>
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static int em_u32_match(struct sk_buff *skb, struct tcf_ematch *em,
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struct tcf_pkt_info *info)
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{
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struct tc_u32_key *key = (struct tc_u32_key *) em->data;
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const unsigned char *ptr = skb_network_header(skb);
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if (info) {
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if (info->ptr)
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ptr = info->ptr;
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ptr += (info->nexthdr & key->offmask);
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}
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ptr += key->off;
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if (!tcf_valid_offset(skb, ptr, sizeof(u32)))
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return 0;
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return !(((*(__be32 *) ptr) ^ key->val) & key->mask);
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}
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static struct tcf_ematch_ops em_u32_ops = {
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.kind = TCF_EM_U32,
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.datalen = sizeof(struct tc_u32_key),
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.match = em_u32_match,
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.owner = THIS_MODULE,
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.link = LIST_HEAD_INIT(em_u32_ops.link)
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};
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static int __init init_em_u32(void)
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{
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return tcf_em_register(&em_u32_ops);
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}
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static void __exit exit_em_u32(void)
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{
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tcf_em_unregister(&em_u32_ops);
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}
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MODULE_LICENSE("GPL");
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module_init(init_em_u32);
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module_exit(exit_em_u32);
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MODULE_ALIAS_TCF_EMATCH(TCF_EM_U32);
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