lib/libstand/ether.c

   1 /*      $NetBSD: ether.c,v 1.11 1997/07/07 15:52:50 drochner Exp $      */
   2 /* $DragonFly: src/lib/libstand/ether.c,v 1.2 2004/10/25 19:38:45 drhodus Exp $                                                         */
   3
   4 /*
   5  * Copyright (c) 1992 Regents of the University of California.
   6  * All rights reserved.
   7  *
   8  * This software was developed by the Computer Systems Engineering group
   9  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  10  * contributed to Berkeley.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Lawrence Berkeley Laboratory and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp  (LBL)
  41  */
  42
  43 #include <sys/param.h>
  44 #include <sys/socket.h>
  45 #include <string.h>
  46
  47 #include <net/if.h>
  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         ssize_t n;
  67         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         struct iodesc *d;
  97         void *pkt;
  98         size_t len;
  99         time_t tleft;
 100         u_int16_t *etype;
 101 {
 102         ssize_t n;
 103         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         u_char *ap;
 140 {
 141         int i;
 142         static char etherbuf[18];
 143         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 }