android_kernel_xiaomi_sm8350/include/net/dsfield.h
Al Viro 5c78f275e6 [NET]: IP header modifier helpers annotations.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-02 21:23:40 -08:00

55 lines
1.1 KiB
C

/* 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(*(__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)
{
__u16 tmp;
tmp = ntohs(*(__be16 *) ipv6h);
tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4);
*(__be16 *) ipv6h = htons(tmp);
}
#endif