[deliverable/linux.git] / include / net / dsfield.h

/* 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(const struct iphdr *iph)
{
	return iph->tos;
}


static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
{
	return ntohs(*(const __be16 *)ipv6h) >> 4;
}


static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
    __u8 value)
{
        __u32 check = ntohs((__force __be16)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 = (__force __sum16)htons(check);
	iph->tos = dsfield;
}


static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
    __u8 value)
{
	__be16 *p = (__force __be16 *)ipv6h;

	*p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4);
}


#endif
Commit	Line	Data
	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	__be16 p = (__force __be16 )ipv6h;
	47
	48	p = (p & htons((((u16)mask << 4) \| 0xf00f))) \| htons((u16)value << 4);
	49	}
	50
	51
	52	#endif