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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/net/dsfield.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/net/dsfield.h')
-rw-r--r-- | include/net/dsfield.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/include/net/dsfield.h b/include/net/dsfield.h new file mode 100644 index 000000000000..a79c9e075f7f --- /dev/null +++ b/include/net/dsfield.h @@ -0,0 +1,54 @@ +/* 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(*(__u16 *) ipv6h) >> 4; +} + + +static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask, + __u8 value) +{ + __u32 check = ntohs(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 = htons(check); + iph->tos = dsfield; +} + + +static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask, + __u8 value) +{ + __u16 tmp; + + tmp = ntohs(*(__u16 *) ipv6h); + tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4); + *(__u16 *) ipv6h = htons(tmp); +} + + +#endif |