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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dsfield.h (1147B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* include/net/dsfield.h - Manipulation of the Differentiated Services field */
      3
      4/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
      5
      6
      7#ifndef __NET_DSFIELD_H
      8#define __NET_DSFIELD_H
      9
     10#include <linux/types.h>
     11#include <linux/ip.h>
     12#include <linux/ipv6.h>
     13#include <asm/byteorder.h>
     14
     15
     16static inline __u8 ipv4_get_dsfield(const struct iphdr *iph)
     17{
     18	return iph->tos;
     19}
     20
     21
     22static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
     23{
     24	return ntohs(*(__force const __be16 *)ipv6h) >> 4;
     25}
     26
     27
     28static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
     29    __u8 value)
     30{
     31        __u32 check = ntohs((__force __be16)iph->check);
     32	__u8 dsfield;
     33
     34	dsfield = (iph->tos & mask) | value;
     35	check += iph->tos;
     36	if ((check+1) >> 16) check = (check+1) & 0xffff;
     37	check -= dsfield;
     38	check += check >> 16; /* adjust carry */
     39	iph->check = (__force __sum16)htons(check);
     40	iph->tos = dsfield;
     41}
     42
     43
     44static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
     45    __u8 value)
     46{
     47	__be16 *p = (__force __be16 *)ipv6h;
     48
     49	*p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4);
     50}
     51
     52
     53#endif