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 "bootp.h"
  28 #include "rarp.h"
  29 #include "tftp.h"
  30
  31 #if (CONFIG_COMMANDS & CFG_CMD_NET)
  32
  33 #define TIMEOUT         5               /* Seconds before trying BOOTP again */
  34 #ifndef CONFIG_NET_RETRY_COUNT
  35 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  36 #else
  37 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  38 #endif
  39
  40
  41 int             RarpTry;
  42
  43 /*
  44  *      Handle a RARP received packet.
  45  */
  46 static void
  47 RarpHandler(uchar * dummi0, unsigned dummi1, unsigned dummi2, unsigned dummi3)
  48 {
  49 #ifdef  DEBUG
  50         printf("Got good RARP\n");
  51 #endif
  52         TftpStart ();
  53 }
  54
  55
  56 /*
  57  *      Timeout on BOOTP request.
  58  */
  59 static void
  60 RarpTimeout(void)
  61 {
  62         if (RarpTry >= TIMEOUT_COUNT) {
  63                 puts ("\nRetry count exceeded; starting again\n");
  64                 NetStartAgain ();
  65         } else {
  66                 NetSetTimeout (TIMEOUT * CFG_HZ, RarpTimeout);
  67                 RarpRequest ();
  68         }
  69 }
  70
  71
  72 void
  73 RarpRequest (void)
  74 {
  75         int i;
  76         volatile uchar *pkt;
  77         ARP_t * rarp;
  78
  79         printf("RARP broadcast %d\n", ++RarpTry);
  80         pkt = NetTxPacket;
  81
  82         NetSetEther(pkt, NetBcastAddr, PROT_RARP);
  83         pkt += ETHER_HDR_SIZE;
  84
  85         rarp = (ARP_t *)pkt;
  86
  87         rarp->ar_hrd = ARP_ETHER;
  88         rarp->ar_pro = PROT_IP;
  89         rarp->ar_hln = 6;
  90         rarp->ar_pln = 4;
  91         rarp->ar_op  = RARPOP_REQUEST;
  92         memcpy (&rarp->ar_data[0],  NetOurEther, 6);    /* source ET addr */
  93         memcpy (&rarp->ar_data[6],  &NetOurIP,   4);    /* source IP addr */
  94         memcpy (&rarp->ar_data[10], NetOurEther, 6);    /* dest ET addr = source ET addr ??*/
  95         /* dest. IP addr set to broadcast */
  96         for (i = 0; i <= 3; i++) {
  97                 rarp->ar_data[16 + i] = 0xff;
  98         }
  99
 100         NetSendPacket(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
 101
 102         NetSetTimeout(TIMEOUT * CFG_HZ, RarpTimeout);
 103         NetSetHandler(RarpHandler);
 104 }
 105
 106 #endif /* CFG_CMD_NET */