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ether.c revision 1.1 
      1 /*
      2  * Copyright (c) 1992 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This software was developed by the Computer Systems Engineering group
      6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      7  * contributed to Berkeley.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Lawrence Berkeley Laboratory and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  * from @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp  (LBL)
     38  */
     39 
     40 #include <sys/param.h>
     41 #include <sys/socket.h>
     42 #include <string.h>
     43 
     44 #include <net/if.h>
     45 
     46 #include <netinet/in.h>
     47 #include <netinet/if_ether.h>
     48 #include <netinet/in_systm.h>
     49 #include <netinet/ip.h>
     50 
     51 #include "stand.h"
     52 #include "net.h"
     53 #include "netif.h"
     54 
     55 const u_char bcea[6] = {
     56 	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
     57 };
     58 
     59 /* Caller must leave room for ethernet header in front!! */
     60 int
     61 sendether(d, buf, len, dea, etype)
     62 	struct iodesc *d;
     63 	void *buf;
     64 	int len;
     65 	u_char *dea;
     66 	int etype;
     67 {
     68 	register struct ether_header *eh;
     69 
     70 #ifdef ETHER_DEBUG
     71  	if (debug)
     72 		printf("sendether: called\n");
     73 #endif
     74 	eh = ((struct ether_header *)buf) - 1;
     75 	len += ETHER_SIZE;
     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 	return (netif_put(d, eh, len) - ETHER_SIZE);
     81 }
     82 
     83 /*
     84  * Convert Ethernet address to printable (loggable) representation.
     85  */
     86 static char digits[] = "0123456789abcdef";
     87 char *
     88 ether_sprintf(ap)
     89         register u_char *ap;
     90 {
     91 	register i;
     92 	static char etherbuf[18];
     93 	register char *cp = etherbuf;
     94 
     95 	for (i = 0; i < 6; i++) {
     96 		*cp++ = digits[*ap >> 4];
     97 		*cp++ = digits[*ap++ & 0xf];
     98 		*cp++ = ':';
     99 	}
    100 	*--cp = 0;
    101 	return (etherbuf);
    102 }
    103