dm log: fix create_log_context to use logical_block_size of log device
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / net / dsfield.h
blob8a8d4e06900d8824ba4a892c5f29f9c40525f0e0
1 /* include/net/dsfield.h - Manipulation of the Differentiated Services field */
3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
6 #ifndef __NET_DSFIELD_H
7 #define __NET_DSFIELD_H
9 #include <linux/types.h>
10 #include <linux/ip.h>
11 #include <linux/ipv6.h>
12 #include <asm/byteorder.h>
15 static inline __u8 ipv4_get_dsfield(const struct iphdr *iph)
17 return iph->tos;
21 static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h)
23 return ntohs(*(const __be16 *)ipv6h) >> 4;
27 static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
28 __u8 value)
30 __u32 check = ntohs((__force __be16)iph->check);
31 __u8 dsfield;
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;
43 static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
44 __u8 value)
46 __u16 tmp;
48 tmp = ntohs(*(__be16 *) ipv6h);
49 tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4);
50 *(__be16 *) ipv6h = htons(tmp);
54 #endif