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Linux/include/net/dsfield.h

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  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 
 16 static inline __u8 ipv4_get_dsfield(const struct iphdr *iph)
 17 {
 18         return iph->tos;
 19 }
 20 
 21 
 22 static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
 23 {
 24         return ntohs(*(const __be16 *)ipv6h) >> 4;
 25 }
 26 
 27 
 28 static 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 
 44 static 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
 54 

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