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HAM Radio 1
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HamRadio.cdr
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misc
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src0131
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enethdr.c
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C/C++ Source or Header
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1991-01-26
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801b
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42 lines
/* Ethernet header conversion routines
* Copyright 1991 Phil Karn, KA9Q
*/
#include "global.h"
#include "mbuf.h"
#include "enet.h"
/* Convert Ethernet header in host form to network mbuf */
struct mbuf *
htonether(ether,data)
struct ether *ether;
struct mbuf *data;
{
struct mbuf *bp;
register char *cp;
if((bp = pushdown(data,ETHERLEN)) == NULLBUF)
return NULLBUF;
cp = bp->data;
memcpy(cp,ether->dest,EADDR_LEN);
cp += EADDR_LEN;
memcpy(cp,ether->source,EADDR_LEN);
cp += EADDR_LEN;
put16(cp,ether->type);
return bp;
}
/* Extract Ethernet header */
int
ntohether(ether,bpp)
struct ether *ether;
struct mbuf **bpp;
{
pullup(bpp,ether->dest,EADDR_LEN);
pullup(bpp,ether->source,EADDR_LEN);
ether->type = pull16(bpp);
return ETHERLEN;
}