usr/src/boot/lib/libstand/ether.c

   1 /*      $NetBSD: ether.c,v 1.11 1997/07/07 15:52:50 drochner 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  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp  (LBL)
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include <sys/param.h>
  42 #include <sys/socket.h>
  43 #include <string.h>
  44
  45 #include <net/if.h>
  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 /* Caller must leave room for ethernet header in front!! */
  56 ssize_t
  57 sendether(d, pkt, len, dea, etype)
  58         struct iodesc *d;
  59         void *pkt;
  60         size_t len;
  61         u_char *dea;
  62         int etype;
  63 {
  64         ssize_t n;
  65         struct ether_header *eh;
  66
  67 #ifdef ETHER_DEBUG
  68         if (debug)
  69                 printf("sendether: called\n");
  70 #endif
  71
  72         eh = (struct ether_header *)pkt - 1;
  73         len += sizeof(*eh);
  74
  75         MACPY(d->myea, eh->ether_shost);                /* by byte */
  76         MACPY(dea, eh->ether_dhost);                    /* by byte */
  77         eh->ether_type = htons(etype);
  78
  79         n = netif_put(d, eh, len);
  80         if (n == -1 || n < sizeof(*eh))
  81                 return (-1);
  82
  83         n -= sizeof(*eh);
  84         return (n);
  85 }
  86
  87 /*
  88  * Get a packet of any Ethernet type, with our address or
  89  * the broadcast address.  Save the Ether type in arg 5.
  90  * NOTE: Caller must leave room for the Ether header.
  91  */
  92 ssize_t
  93 readether(d, pkt, len, tleft, etype)
  94         struct iodesc *d;
  95         void *pkt;
  96         size_t len;
  97         time_t tleft;
  98         u_int16_t *etype;
  99 {
 100         ssize_t n;
 101         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         n = netif_get(d, eh, len, tleft);
 112         if (n == -1 || n < 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         n -= sizeof(*eh);
 128         return (n);
 129 }
 130
 131 /*
 132  * Convert Ethernet address to printable (loggable) representation.
 133  */
 134 static char digits[] = "0123456789abcdef";
 135 char *
 136 ether_sprintf(ap)
 137         u_char *ap;
 138 {
 139         int i;
 140         static char etherbuf[18];
 141         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 }