80 lines
1.4 KiB
C
Executable File
80 lines
1.4 KiB
C
Executable File
/* include/net/dsfield.h - Manipulation of the Differentiated Services field */
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/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
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#ifndef __NET_DSFIELD_H
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#define __NET_DSFIELD_H
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#include <linux/types.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <asm/byteorder.h>
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static inline __u8 ipv4_get_dsfield(struct iphdr *iph)
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{
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return iph->tos;
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}
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static inline __u8 ipv6_get_dsfield(struct ipv6hdr *ipv6h)
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{
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return ntohs(*(__u16 *) ipv6h) >> 4;
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}
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static inline void ipv4_change_dsfield(struct iphdr *iph,__u8 mask,
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__u8 value)
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{
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__u32 check = ntohs(iph->check);
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__u8 dsfield;
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dsfield = (iph->tos & mask) | value;
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check += iph->tos;
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if ((check+1) >> 16) check = (check+1) & 0xffff;
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check -= dsfield;
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check += check >> 16; /* adjust carry */
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iph->check = htons(check);
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iph->tos = dsfield;
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}
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static inline void ipv6_change_dsfield(struct ipv6hdr *ipv6h,__u8 mask,
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__u8 value)
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{
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__u16 tmp;
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tmp = ntohs(*(__u16 *) ipv6h);
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tmp = (tmp & ((mask << 4) | 0xf00f)) | (value << 4);
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*(__u16 *) ipv6h = htons(tmp);
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}
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#if 0 /* put this later into asm-i386 or such ... */
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static inline void ip_change_dsfield(struct iphdr *iph,__u16 dsfield)
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{
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__u16 check;
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__asm__ __volatile__("
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movw 10(%1),%0
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xchg %b0,%h0
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addb 1(%1),%b0
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adcb $0,%h0
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adcw $1,%0
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cmc
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sbbw %2,%0
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sbbw $0,%0
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movb %b2,1(%1)
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xchg %b0,%h0
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movw %0,10(%1)"
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: "=&r" (check)
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: "r" (iph), "r" (dsfield)
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: "cc");
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}
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#endif
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#endif
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