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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);

}

#endif