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146 lines
4.0 KiB
C
146 lines
4.0 KiB
C
/* $NetBSD: ether.c,v 1.11 1997/07/07 15:52:50 drochner Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp (LBL)
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include "stand.h"
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#include "net.h"
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#include "netif.h"
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/* Caller must leave room for ethernet header in front!! */
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ssize_t
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sendether(struct iodesc *d, void *pkt, size_t len, uint8_t *dea, int etype)
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{
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ssize_t n;
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struct ether_header *eh;
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#ifdef ETHER_DEBUG
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if (debug)
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printf("sendether: called\n");
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#endif
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eh = (struct ether_header *)pkt - 1;
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len += sizeof(*eh);
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MACPY(d->myea, eh->ether_shost); /* by byte */
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MACPY(dea, eh->ether_dhost); /* by byte */
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eh->ether_type = htons(etype);
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n = netif_put(d, eh, len);
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if (n == -1 || n < sizeof(*eh))
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return (-1);
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n -= sizeof(*eh);
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return (n);
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}
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/*
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* Get a packet of any Ethernet type, with our address or
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* the broadcast address. Save the Ether type in etype.
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* Unless there is an error, we pass the whole packet and the unencapsulated
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* data.
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*/
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ssize_t
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readether(struct iodesc *d, void **pkt, void **payload, time_t tleft,
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uint16_t *etype)
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{
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ssize_t n;
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struct ether_header *eh;
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void *ptr;
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#ifdef ETHER_DEBUG
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if (debug)
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printf("readether: called\n");
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#endif
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ptr = NULL;
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n = netif_get(d, &ptr, tleft);
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if (n == -1 || n < sizeof(*eh)) {
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free(ptr);
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return (-1);
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}
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eh = (struct ether_header *)((uintptr_t)ptr + ETHER_ALIGN);
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/* Validate Ethernet address. */
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if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
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bcmp(bcea, eh->ether_dhost, 6) != 0) {
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#ifdef ETHER_DEBUG
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if (debug)
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printf("readether: not ours (ea=%s)\n",
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ether_sprintf(eh->ether_dhost));
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#endif
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free(ptr);
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return (-1);
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}
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*pkt = ptr;
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*payload = (void *)((uintptr_t)eh + sizeof(*eh));
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*etype = ntohs(eh->ether_type);
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n -= sizeof(*eh);
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return (n);
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}
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/*
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* Convert Ethernet address to printable (loggable) representation.
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*/
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static char digits[] = "0123456789abcdef";
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char *
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ether_sprintf(u_char *ap)
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{
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int i;
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static char etherbuf[18];
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char *cp = etherbuf;
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for (i = 0; i < 6; i++) {
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*cp++ = digits[*ap >> 4];
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*cp++ = digits[*ap++ & 0xf];
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*cp++ = ':';
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}
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*--cp = 0;
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return (etherbuf);
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}
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