cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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em_u32.c (1256B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * net/sched/em_u32.c	U32 Ematch
      4 *
      5 * Authors:	Thomas Graf <tgraf@suug.ch>
      6 *		Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
      7 *
      8 * Based on net/sched/cls_u32.c
      9 */
     10
     11#include <linux/module.h>
     12#include <linux/types.h>
     13#include <linux/kernel.h>
     14#include <linux/skbuff.h>
     15#include <net/pkt_cls.h>
     16
     17static int em_u32_match(struct sk_buff *skb, struct tcf_ematch *em,
     18			struct tcf_pkt_info *info)
     19{
     20	struct tc_u32_key *key = (struct tc_u32_key *) em->data;
     21	const unsigned char *ptr = skb_network_header(skb);
     22
     23	if (info) {
     24		if (info->ptr)
     25			ptr = info->ptr;
     26		ptr += (info->nexthdr & key->offmask);
     27	}
     28
     29	ptr += key->off;
     30
     31	if (!tcf_valid_offset(skb, ptr, sizeof(u32)))
     32		return 0;
     33
     34	return !(((*(__be32 *) ptr)  ^ key->val) & key->mask);
     35}
     36
     37static struct tcf_ematch_ops em_u32_ops = {
     38	.kind	  = TCF_EM_U32,
     39	.datalen  = sizeof(struct tc_u32_key),
     40	.match	  = em_u32_match,
     41	.owner	  = THIS_MODULE,
     42	.link	  = LIST_HEAD_INIT(em_u32_ops.link)
     43};
     44
     45static int __init init_em_u32(void)
     46{
     47	return tcf_em_register(&em_u32_ops);
     48}
     49
     50static void __exit exit_em_u32(void)
     51{
     52	tcf_em_unregister(&em_u32_ops);
     53}
     54
     55MODULE_LICENSE("GPL");
     56
     57module_init(init_em_u32);
     58module_exit(exit_em_u32);
     59
     60MODULE_ALIAS_TCF_EMATCH(TCF_EM_U32);