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ether.c revision 1.6 
      1 /*	$NetBSD: ether.c,v 1.6 1995/09/14 23:45:25 pk 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 ssize_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 ssize_t n;
     67 	register struct ether_header *eh;
     68 
     69 #ifdef ETHER_DEBUG
     70  	if (debug)
     71 		printf("sendether: called\n");
     72 #endif
     73 
     74 	eh = (struct ether_header *)pkt - 1;
     75 	len += sizeof(*eh);
     76 
     77 	MACPY(d->myea, eh->ether_shost);		/* by byte */
     78 	MACPY(dea, eh->ether_dhost);			/* by byte */
     79 	eh->ether_type = htons(etype);
     80 
     81 	n = netif_put(d, eh, len);
     82 	if (n == -1 || n < sizeof(*eh))
     83 		return (-1);
     84 
     85 	n -= sizeof(*eh);
     86 	return (n);
     87 }
     88 
     89 /*
     90  * Get a packet of any Ethernet type, with our address or
     91  * the broadcast address.  Save the Ether type in arg 5.
     92  * NOTE: Caller must leave room for the Ether header.
     93  */
     94 ssize_t
     95 readether(d, pkt, len, tleft, etype)
     96 	register struct iodesc *d;
     97 	register void *pkt;
     98 	register size_t len;
     99 	time_t tleft;
    100 	register u_int16_t *etype;
    101 {
    102 	register ssize_t n;
    103 	register struct ether_header *eh;
    104 
    105 #ifdef ETHER_DEBUG
    106  	if (debug)
    107 		printf("readether: called\n");
    108 #endif
    109 
    110 	eh = (struct ether_header *)pkt - 1;
    111 	len += sizeof(*eh);
    112 
    113 	n = netif_get(d, eh, len, tleft);
    114 	if (n == -1 || n < sizeof(*eh))
    115 		return (-1);
    116 
    117 	/* Validate Ethernet address. */
    118 	if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
    119 	    bcmp(bcea, eh->ether_dhost, 6) != 0) {
    120 #ifdef ETHER_DEBUG
    121 		if (debug)
    122 			printf("readether: not ours (ea=%s)\n",
    123 				ether_sprintf(eh->ether_dhost));
    124 #endif
    125 		return (-1);
    126 	}
    127 	*etype = ntohs(eh->ether_type);
    128 
    129 	n -= sizeof(*eh);
    130 	return (n);
    131 }
    132 
    133 /*
    134  * Convert Ethernet address to printable (loggable) representation.
    135  */
    136 static char digits[] = "0123456789abcdef";
    137 char *
    138 ether_sprintf(ap)
    139         register u_char *ap;
    140 {
    141 	register i;
    142 	static char etherbuf[18];
    143 	register char *cp = etherbuf;
    144 
    145 	for (i = 0; i < 6; i++) {
    146 		*cp++ = digits[*ap >> 4];
    147 		*cp++ = digits[*ap++ & 0xf];
    148 		*cp++ = ':';
    149 	}
    150 	*--cp = 0;
    151 	return (etherbuf);
    152 }
    153