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  >  / usr / src / linux-headers-3.13.0-24 / include / net / 		server ip : 104.21.89.46

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H O M E


Filename/usr/src/linux-headers-3.13.0-24/include/net/dsfield.h
Size1.07 kb
Permissionrw-r--r--
Ownerroot : root
Create time27-Apr-2025 09:50
Last modified20-Jan-2014 10:40
Last accessed05-Jul-2025 22:34
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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(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