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ether.c revision 1.19 
      1 /*	$NetBSD: ether.c,v 1.19 2005/06/13 12:11:07 junyoung 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 #ifdef _STANDALONE
     45 #include <lib/libkern/libkern.h>
     46 #else
     47 #include <string.h>
     48 #endif
     49 
     50 #include <net/if.h>
     51 #include <net/if_ether.h>
     52 
     53 #include <netinet/in.h>
     54 #include <netinet/in_systm.h>
     55 
     56 #include "stand.h"
     57 #include "net.h"
     58 
     59 /* Caller must leave room for ethernet header in front!! */
     60 ssize_t
     61 sendether(d, pkt, len, dea, etype)
     62 	struct iodesc *d;
     63 	void *pkt;
     64 	size_t len;
     65 	u_char *dea;
     66 	int etype;
     67 {
     68 	ssize_t n;
     69 	struct ether_header *eh;
     70 
     71 #ifdef ETHER_DEBUG
     72  	if (debug)
     73 		printf("sendether: called\n");
     74 #endif
     75 
     76 	eh = (struct ether_header *)pkt - 1;
     77 	len += sizeof(*eh);
     78 
     79 	MACPY(d->myea, eh->ether_shost);		/* by byte */
     80 	MACPY(dea, eh->ether_dhost);			/* by byte */
     81 	eh->ether_type = htons(etype);
     82 
     83 	n = netif_put(d, eh, len);
     84 	if (n == -1 || (size_t)n < sizeof(*eh))
     85 		return (-1);
     86 
     87 	n -= sizeof(*eh);
     88 	return (n);
     89 }
     90 
     91 /*
     92  * Get a packet of any Ethernet type, with our address or
     93  * the broadcast address.  Save the Ether type in arg 5.
     94  * NOTE: Caller must leave room for the Ether header.
     95  */
     96 ssize_t
     97 readether(d, pkt, len, tleft, etype)
     98 	struct iodesc *d;
     99 	void *pkt;
    100 	size_t len;
    101 	time_t tleft;
    102 	u_int16_t *etype;
    103 {
    104 	ssize_t n;
    105 	struct ether_header *eh;
    106 
    107 #ifdef ETHER_DEBUG
    108  	if (debug)
    109 		printf("readether: called\n");
    110 #endif
    111 
    112 	eh = (struct ether_header *)pkt - 1;
    113 	len += sizeof(*eh);
    114 
    115 	n = netif_get(d, eh, len, tleft);
    116 	if (n == -1 || (size_t)n < sizeof(*eh))
    117 		return (-1);
    118 
    119 	/* Validate Ethernet address. */
    120 	if (memcmp(d->myea, eh->ether_dhost, 6) != 0 &&
    121 	    memcmp(bcea, eh->ether_dhost, 6) != 0) {
    122 #ifdef ETHER_DEBUG
    123 		if (debug)
    124 			printf("readether: not ours (ea=%s)\n",
    125 			    ether_sprintf(eh->ether_dhost));
    126 #endif
    127 		return (-1);
    128 	}
    129 	*etype = ntohs(eh->ether_type);
    130 
    131 	n -= sizeof(*eh);
    132 	return (n);
    133 }
    134