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/* $OpenBSD: ether.c,v 1.8 2014/07/13 15:31:20 mpi Exp $ */
/* $NetBSD: ether.c,v 1.8 1996/10/13 02:29:00 christos Exp $ */
/*
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include "stand.h"
#include "net.h"
#include "netif.h"
/* Caller must leave room for ethernet header in front!! */
ssize_t
sendether(d, pkt, len, dea, etype)
struct iodesc *d;
void *pkt;
size_t len;
u_char *dea;
int etype;
{
ssize_t n;
struct ether_header *eh;
#ifdef ETHER_DEBUG
if (debug)
printf("sendether: called\n");
#endif
eh = (struct ether_header *)pkt - 1;
len += sizeof(*eh);
MACPY(d->myea, eh->ether_shost); /* by byte */
MACPY(dea, eh->ether_dhost); /* by byte */
eh->ether_type = htons(etype);
n = netif_put(d, eh, len);
if (n < 0 || (size_t)n < sizeof(*eh))
return (-1);
n -= sizeof(*eh);
return (n);
}
/*
* Get a packet of any Ethernet type, with our address or
* the broadcast address. Save the Ether type in arg 5.
* NOTE: Caller must leave room for the Ether header.
*/
ssize_t
readether(d, pkt, len, tleft, etype)
struct iodesc *d;
void *pkt;
size_t len;
time_t tleft;
u_int16_t *etype;
{
ssize_t n;
struct ether_header *eh;
#ifdef ETHER_DEBUG
if (debug)
printf("readether: called\n");
#endif
eh = (struct ether_header *)pkt - 1;
len += sizeof(*eh);
n = netif_get(d, eh, len, tleft);
if (n < 0 || (size_t)n < sizeof(*eh))
return (-1);
/* Validate Ethernet address. */
if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
bcmp(bcea, eh->ether_dhost, 6) != 0) {
#ifdef ETHER_DEBUG
if (debug)
printf("readether: not ours (ea=%s)\n",
ether_sprintf(eh->ether_dhost));
#endif
return (-1);
}
*etype = ntohs(eh->ether_type);
n -= sizeof(*eh);
return (n);
}
/*
* Convert Ethernet address to printable (loggable) representation.
*/
static char digits[] = "0123456789abcdef";
char *
ether_sprintf(u_char *ap)
{
int i;
static char etherbuf[18];
char *cp = etherbuf;
for (i = 0; i < 6; i++) {
*cp++ = digits[*ap >> 4];
*cp++ = digits[*ap++ & 0xf];
*cp++ = ':';
}
*--cp = 0;
return (etherbuf);
}
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