cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

inet_dscp.h (1590B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * inet_dscp.h: helpers for handling differentiated services codepoints (DSCP)
      4 *
      5 * DSCP is defined in RFC 2474:
      6 *
      7 *        0   1   2   3   4   5   6   7
      8 *      +---+---+---+---+---+---+---+---+
      9 *      |         DSCP          |  CU   |
     10 *      +---+---+---+---+---+---+---+---+
     11 *
     12 *        DSCP: differentiated services codepoint
     13 *        CU:   currently unused
     14 *
     15 * The whole DSCP + CU bits form the DS field.
     16 * The DS field is also commonly called TOS or Traffic Class (for IPv6).
     17 *
     18 * Note: the CU bits are now used for Explicit Congestion Notification
     19 *       (RFC 3168).
     20 */
     21
     22#ifndef _INET_DSCP_H
     23#define _INET_DSCP_H
     24
     25#include <linux/types.h>
     26
     27/* Special type for storing DSCP values.
     28 *
     29 * A dscp_t variable stores a DS field with the CU (ECN) bits cleared.
     30 * Using dscp_t allows to strictly separate DSCP and ECN bits, thus avoiding
     31 * bugs where ECN bits are erroneously taken into account during FIB lookups
     32 * or policy routing.
     33 *
     34 * Note: to get the real DSCP value contained in a dscp_t variable one would
     35 * have to do a bit shift after calling inet_dscp_to_dsfield(). We could have
     36 * a helper for that, but there's currently no users.
     37 */
     38typedef u8 __bitwise dscp_t;
     39
     40#define INET_DSCP_MASK 0xfc
     41
     42static inline dscp_t inet_dsfield_to_dscp(__u8 dsfield)
     43{
     44	return (__force dscp_t)(dsfield & INET_DSCP_MASK);
     45}
     46
     47static inline __u8 inet_dscp_to_dsfield(dscp_t dscp)
     48{
     49	return (__force __u8)dscp;
     50}
     51
     52static inline bool inet_validate_dscp(__u8 val)
     53{
     54	return !(val & ~INET_DSCP_MASK);
     55}
     56
     57#endif /* _INET_DSCP_H */