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Linux/include/net/dsfield.h

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  1 /* include/net/dsfield.h - Manipulation of the Differentiated Services field */
  2 
  3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
  4 
  5 
  6 #ifndef __NET_DSFIELD_H
  7 #define __NET_DSFIELD_H
  8 
  9 #include <linux/types.h>
 10 #include <linux/ip.h>
 11 #include <linux/ipv6.h>
 12 #include <asm/byteorder.h>
 13 
 14 
 15 static inline __u8 ipv4_get_dsfield(const struct iphdr *iph)
 16 {
 17         return iph->tos;
 18 }
 19 
 20 
 21 static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
 22 {
 23         return ntohs(*(const __be16 *)ipv6h) >> 4;
 24 }
 25 
 26 
 27 static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
 28     __u8 value)
 29 {
 30         __u32 check = ntohs((__force __be16)iph->check);
 31         __u8 dsfield;
 32 
 33         dsfield = (iph->tos & mask) | value;
 34         check += iph->tos;
 35         if ((check+1) >> 16) check = (check+1) & 0xffff;
 36         check -= dsfield;
 37         check += check >> 16; /* adjust carry */
 38         iph->check = (__force __sum16)htons(check);
 39         iph->tos = dsfield;
 40 }
 41 
 42 
 43 static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
 44     __u8 value)
 45 {
 46         __u16 tmp;
 47 
 48         tmp = ntohs(*(__be16 *) ipv6h);
 49         tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4);
 50         *(__be16 *) ipv6h = htons(tmp);
 51 }
 52 
 53 
 54 #endif
 55 

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