LXR uboot/net/rarp.c

   1/*
   2 * (C) Copyright 2000-2002
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 */
  23
  24#include <common.h>
  25#include <command.h>
  26#include <net.h>
  27#include "nfs.h"
  28#include "bootp.h"
  29#include "rarp.h"
  30#include "tftp.h"
  31
  32#if defined(CONFIG_CMD_NET)
  33
  34#define TIMEOUT         5000UL  /* Milliseconds before trying BOOTP again */
  35#ifndef CONFIG_NET_RETRY_COUNT
  36# define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  37#else
  38# define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  39#endif
  40
  41
  42int             RarpTry;
  43
  44/*
  45 *      Handle a RARP received packet.
  46 */
  47static void
  48RarpHandler(uchar * dummi0, unsigned dummi1, unsigned dummi2, unsigned dummi3)
  49{
  50        char *s;
  51#ifdef  DEBUG
  52        puts ("Got good RARP\n");
  53#endif
  54        if ((s = getenv("autoload")) != NULL) {
  55                if (*s == 'n') {
  56                        /*
  57                         * Just use RARP to configure system;
  58                         * Do not use TFTP/NFS to to load the bootfile.
  59                         */
  60                        NetState = NETLOOP_SUCCESS;
  61                        return;
  62#if defined(CONFIG_CMD_NFS)
  63                } else if ((s != NULL) && !strcmp(s, "NFS")) {
  64                        NfsStart();
  65                        return;
  66#endif
  67                }
  68        }
  69        TftpStart ();
  70}
  71
  72
  73/*
  74 *      Timeout on BOOTP request.
  75 */
  76static void
  77RarpTimeout(void)
  78{
  79        if (RarpTry >= TIMEOUT_COUNT) {
  80                puts ("\nRetry count exceeded; starting again\n");
  81                NetStartAgain ();
  82        } else {
  83                NetSetTimeout (TIMEOUT, RarpTimeout);
  84                RarpRequest ();
  85        }
  86}
  87
  88
  89void
  90RarpRequest (void)
  91{
  92        int i;
  93        volatile uchar *pkt;
  94        ARP_t * rarp;
  95
  96        printf("RARP broadcast %d\n", ++RarpTry);
  97        pkt = NetTxPacket;
  98
  99        pkt += NetSetEther(pkt, NetBcastAddr, PROT_RARP);
 100
 101        rarp = (ARP_t *)pkt;
 102
 103        rarp->ar_hrd = htons (ARP_ETHER);
 104        rarp->ar_pro = htons (PROT_IP);
 105        rarp->ar_hln = 6;
 106        rarp->ar_pln = 4;
 107        rarp->ar_op  = htons (RARPOP_REQUEST);
 108        memcpy (&rarp->ar_data[0],  NetOurEther, 6);    /* source ET addr */
 109        memcpy (&rarp->ar_data[6],  &NetOurIP,   4);    /* source IP addr */
 110        memcpy (&rarp->ar_data[10], NetOurEther, 6);    /* dest ET addr = source ET addr ??*/
 111        /* dest. IP addr set to broadcast */
 112        for (i = 0; i <= 3; i++) {
 113                rarp->ar_data[16 + i] = 0xff;
 114        }
 115
 116        NetSendPacket(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 117
 118        NetSetTimeout(TIMEOUT, RarpTimeout);
 119        NetSetHandler(RarpHandler);
 120}
 121
 122#endif
 123