From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- include/net/dsfield.h | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 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 000000000..e1ad903a8 --- /dev/null +++ b/include/net/dsfield.h @@ -0,0 +1,52 @@ +/* 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(const struct iphdr *iph) +{ + return iph->tos; +} + + +static inline __u8 ipv6_get_dsfield(const struct ipv6hdr *ipv6h) +{ + return ntohs(*(const __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) +{ + __be16 *p = (__force __be16 *)ipv6h; + + *p = (*p & htons((((u16)mask << 4) | 0xf00f))) | htons((u16)value << 4); +} + + +#endif -- cgit v1.2.3-54-g00ecf