From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-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! --- include/net/dsfield.h | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 include/net/dsfield.h (limited to 'include/net/dsfield.h') 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 +#include +#include +#include + + +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 -- cgit v1.2.3