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/* include/net/dsfield.h - Manipulation of the Differentiated Services field */
/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
#ifndef __NET_DSFIELD_H
#define __NET_DSFIELD_H
#include <linux/types.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <asm/byteorder.h>
static inline __u8 ipv4_get_dsfield(struct iphdr *iph)
{
return iph->tos;
}
static inline __u8 ipv6_get_dsfield(struct ipv6hdr *ipv6h)
{
return ntohs(*(__u16 *) ipv6h) >> 4;
}
static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
__u8 value)
{
__u32 check = ntohs(iph->check);
__u8 dsfield;
dsfield = (iph->tos & mask) | value;
check += iph->tos;
if ((check+1) >> 16) check = (check+1) & 0xffff;
check -= dsfield;
check += check >> 16; /* adjust carry */
iph->check = htons(check);
iph->tos = dsfield;
}
static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
__u8 value)
{
__u16 tmp;
tmp = ntohs(*(__u16 *) ipv6h);
tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4);
*(__u16 *) ipv6h = htons(tmp);
}
#if 0 /* put this later into asm-i386 or such ... */
static inline void ip_change_dsfield(struct iphdr *iph,__u16 dsfield)
{
__u16 check;
__asm__ __volatile__("
movw 10(%1),%0
xchg %b0,%h0
addb 1(%1),%b0
adcb $0,%h0
adcw $1,%0
cmc
sbbw %2,%0
sbbw $0,%0
movb %b2,1(%1)
xchg %b0,%h0
movw %0,10(%1)"
: "=&r" (check)
: "r" (iph), "r" (dsfield)
: "cc");
}
#endif
#endif
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