| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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(struct iphdr *iph) |
| 16 | { |
| 17 | return iph->tos; |
| 18 | } |
| 19 | |
| 20 | |
| 21 | static inline __u8 ipv6_get_dsfield(struct ipv6hdr *ipv6h) |
| 22 | { |
| 23 | return ntohs(*(__u16 *) 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(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 = 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 | __u16 tmp; |
| 47 | |
| 48 | tmp = ntohs(*(__u16 *) ipv6h); |
| 49 | tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4); |
| 50 | *(__u16 *) ipv6h = htons(tmp); |
| 51 | } |
| 52 | |
| 53 | |
| 54 | #endif |