125 lines
3.8 KiB
C
125 lines
3.8 KiB
C
/* $NetBSD: ether.c,v 1.23 2014/03/29 14:30:16 jakllsch 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>
|
|
#ifdef _STANDALONE
|
|
#include <lib/libkern/libkern.h>
|
|
#else
|
|
#include <string.h>
|
|
#endif
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_ether.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
|
|
#include "stand.h"
|
|
#include "net.h"
|
|
|
|
/* Caller must leave room for ethernet header in front!! */
|
|
ssize_t
|
|
sendether(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 == -1 || (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(struct iodesc *d, void *pkt, size_t len, saseconds_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 == -1 || (size_t)n < sizeof(*eh))
|
|
return -1;
|
|
|
|
/* Validate Ethernet address. */
|
|
if (memcmp(d->myea, eh->ether_dhost, ETHER_ADDR_LEN) != 0 &&
|
|
memcmp(bcea, eh->ether_dhost, ETHER_ADDR_LEN) != 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;
|
|
}
|