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#define TIMEOUT         5000UL  /* Milliseconds before trying BOOTP again */
  33#ifndef CONFIG_NET_RETRY_COUNT
  34# define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  35#else
  36# define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  37#endif
  38
  39
  40int             RarpTry;
  41
  42/*
  43 *      Handle a RARP received packet.
  44 */
  45static void
  46RarpHandler(uchar * dummi0, unsigned dummi1, unsigned dummi2, unsigned dummi3)
  47{
  48        char *s;
  49        debug("Got good RARP\n");
  50        if ((s = getenv("autoload")) != NULL) {
  51                if (*s == 'n') {
  52                        /*
  53                         * Just use RARP to configure system;
  54                         * Do not use TFTP/NFS to to load the bootfile.
  55                         */
  56                        NetState = NETLOOP_SUCCESS;
  57                        return;
  58#if defined(CONFIG_CMD_NFS)
  59                } else if ((s != NULL) && !strcmp(s, "NFS")) {
  60                        NfsStart();
  61                        return;
  62#endif
  63                }
  64        }
  65        TftpStart ();
  66}
  67
  68
  69/*
  70 *      Timeout on BOOTP request.
  71 */
  72static void
  73RarpTimeout(void)
  74{
  75        if (RarpTry >= TIMEOUT_COUNT) {
  76                puts ("\nRetry count exceeded; starting again\n");
  77                NetStartAgain ();
  78        } else {
  79                NetSetTimeout (TIMEOUT, RarpTimeout);
  80                RarpRequest ();
  81        }
  82}
  83
  84
  85void
  86RarpRequest (void)
  87{
  88        int i;
  89        volatile uchar *pkt;
  90        ARP_t * rarp;
  91
  92        printf("RARP broadcast %d\n", ++RarpTry);
  93        pkt = NetTxPacket;
  94
  95        pkt += NetSetEther(pkt, NetBcastAddr, PROT_RARP);
  96
  97        rarp = (ARP_t *)pkt;
  98
  99        rarp->ar_hrd = htons (ARP_ETHER);
 100        rarp->ar_pro = htons (PROT_IP);
 101        rarp->ar_hln = 6;
 102        rarp->ar_pln = 4;
 103        rarp->ar_op  = htons (RARPOP_REQUEST);
 104        memcpy (&rarp->ar_data[0],  NetOurEther, 6);    /* source ET addr */
 105        memcpy (&rarp->ar_data[6],  &NetOurIP,   4);    /* source IP addr */
 106        memcpy (&rarp->ar_data[10], NetOurEther, 6);    /* dest ET addr = source ET addr ??*/
 107        /* dest. IP addr set to broadcast */
 108        for (i = 0; i <= 3; i++) {
 109                rarp->ar_data[16 + i] = 0xff;
 110        }
 111
 112        NetSendPacket(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
 113
 114        NetSetTimeout(TIMEOUT, RarpTimeout);
 115        NetSetHandler(RarpHandler);
 116}
 117