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 1.3 2005/12/11 02:27:26 swildner 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(struct iodesc *d, void *pkt, size_t len, u_char *dea, int etype)
  60 {
  61         ssize_t n;
  62         struct ether_header *eh;
  63
  64 #ifdef ETHER_DEBUG
  65         if (debug)
  66                 printf("sendether: called\n");
  67 #endif
  68
  69         eh = (struct ether_header *)pkt - 1;
  70         len += sizeof(*eh);
  71
  72         MACPY(d->myea, eh->ether_shost);                /* by byte */
  73         MACPY(dea, eh->ether_dhost);                    /* by byte */
  74         eh->ether_type = htons(etype);
  75
  76         n = netif_put(d, eh, len);
  77         if (n == -1 || n < sizeof(*eh))
  78                 return (-1);
  79
  80         n -= sizeof(*eh);
  81         return (n);
  82 }
  83
  84 /*
  85  * Get a packet of any Ethernet type, with our address or
  86  * the broadcast address.  Save the Ether type in arg 5.
  87  * NOTE: Caller must leave room for the Ether header.
  88  */
  89 ssize_t
  90 readether(struct iodesc *d, void *pkt, size_t len, time_t tleft,
  91           u_int16_t *etype)
  92 {
  93         ssize_t n;
  94         struct ether_header *eh;
  95
  96 #ifdef ETHER_DEBUG
  97         if (debug)
  98                 printf("readether: called\n");
  99 #endif
 100
 101         eh = (struct ether_header *)pkt - 1;
 102         len += sizeof(*eh);
 103
 104         n = netif_get(d, eh, len, tleft);
 105         if (n == -1 || n < sizeof(*eh))
 106                 return (-1);
 107
 108         /* Validate Ethernet address. */
 109         if (bcmp(d->myea, eh->ether_dhost, 6) != 0 &&
 110             bcmp(bcea, eh->ether_dhost, 6) != 0) {
 111 #ifdef ETHER_DEBUG
 112                 if (debug)
 113                         printf("readether: not ours (ea=%s)\n",
 114                             ether_sprintf(eh->ether_dhost));
 115 #endif
 116                 return (-1);
 117         }
 118         *etype = ntohs(eh->ether_type);
 119
 120         n -= sizeof(*eh);
 121         return (n);
 122 }
 123
 124 /*
 125  * Convert Ethernet address to printable (loggable) representation.
 126  */
 127 static char digits[] = "0123456789abcdef";
 128 char *
 129 ether_sprintf(u_char *ap)
 130 {
 131         int i;
 132         static char etherbuf[18];
 133         char *cp = etherbuf;
 134
 135         for (i = 0; i < 6; i++) {
 136                 *cp++ = digits[*ap >> 4];
 137                 *cp++ = digits[*ap++ & 0xf];
 138                 *cp++ = ':';
 139         }
 140         *--cp = 0;
 141         return (etherbuf);
 142 }