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ether.c revision 1.5 
      1 /*	$NetBSD: ether.c,v 1.5 1995/09/11 21:11:40 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992 Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Lawrence Berkeley Laboratory and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp  (LBL)
     40  */
     41 
     42 #include <sys/param.h>
     43 #include <sys/socket.h>
     44 #include <string.h>
     45 
     46 #include <net/if.h>
     47 
     48 #include <netinet/in.h>
     49 #include <netinet/if_ether.h>
     50 #include <netinet/in_systm.h>
     51 #include <netinet/ip.h>
     52 
     53 #include "stand.h"
     54 #include "net.h"
     55 #include "netif.h"
     56 
     57 /* Caller must leave room for ethernet header in front!! */
     58 size_t
     59 sendether(d, pkt, len, dea, etype)
     60 	struct iodesc *d;
     61 	void *pkt;
     62 	size_t len;
     63 	u_char *dea;
     64 	int etype;
     65 {
     66 	register struct ether_header *eh;
     67 
     68 #ifdef ETHER_DEBUG
     69  	if (debug)
     70 		printf("sendether: called\n");
     71 #endif
     72 
     73 	eh = (struct ether_header *)pkt - 1;
     74 	len += sizeof(*eh);
     75 
     76 	MACPY(d->myea, eh->ether_shost);		/* by byte */
     77 	MACPY(dea, eh->ether_dhost);			/* by byte */
     78 	eh->ether_type = htons(etype);
     79 
     80 	len = netif_put(d, eh, len);
     81 	if (len == -1 || len < sizeof(*eh))
     82 		return (-1);
     83 
     84 	len -= sizeof(*eh);
     85 	return (len);
     86 }
     87 
     88 /*
     89  * Get a packet of any Ethernet type, with our address or
     90  * the broadcast address.  Save the Ether type in arg 5.
     91  * NOTE: Caller must leave room for the Ether header.
     92  */
     93 size_t
     94 readether(d, pkt, len, tleft, etype)
     95 	register struct iodesc *d;
     96 	register void *pkt;
     97 	register size_t len;
     98 	time_t tleft;
     99 	register u_int16_t *etype;
    100 {
    101 	register struct ether_header *eh;
    102 
    103 #ifdef ETHER_DEBUG
    104  	if (debug)
    105 		printf("readether: called\n");
    106 #endif
    107 
    108 	eh = (struct ether_header *)pkt - 1;
    109 	len += sizeof(*eh);
    110 
    111 	len = netif_get(d, eh, len, tleft);
    112 	if (len == -1 || len < sizeof(*eh))
    113 		return (-1);
    114 
    115 	/* Validate Ethernet address. */
    116 	if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
    117 	    bcmp(bcea, eh->ether_dhost, 6) != 0) {
    118 #ifdef ETHER_DEBUG
    119 		if (debug)
    120 			printf("readether: not ours (ea=%s)\n",
    121 				ether_sprintf(eh->ether_dhost));
    122 #endif
    123 		return (-1);
    124 	}
    125 	*etype = ntohs(eh->ether_type);
    126 
    127 	len -= sizeof(*eh);
    128 	return (len);
    129 }
    130 
    131 /*
    132  * Convert Ethernet address to printable (loggable) representation.
    133  */
    134 static char digits[] = "0123456789abcdef";
    135 char *
    136 ether_sprintf(ap)
    137         register u_char *ap;
    138 {
    139 	register i;
    140 	static char etherbuf[18];
    141 	register char *cp = etherbuf;
    142 
    143 	for (i = 0; i < 6; i++) {
    144 		*cp++ = digits[*ap >> 4];
    145 		*cp++ = digits[*ap++ & 0xf];
    146 		*cp++ = ':';
    147 	}
    148 	*--cp = 0;
    149 	return (etherbuf);
    150 }
    151