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
  39int RarpTry;
  40
  41/*
  42 *      Handle a RARP received packet.
  43 */
  44void rarp_receive(struct ip_udp_hdr *ip, unsigned len)
  45{
  46        struct arp_hdr *arp;
  47
  48        debug_cond(DEBUG_NET_PKT, "Got RARP\n");
  49        arp = (struct arp_hdr *)ip;
  50        if (len < ARP_HDR_SIZE) {
  51                printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
  52                return;
  53        }
  54
  55        if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
  56                (ntohs(arp->ar_hrd) != ARP_ETHER)   ||
  57                (ntohs(arp->ar_pro) != PROT_IP)     ||
  58                (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
  59
  60                puts("invalid RARP header\n");
  61        } else {
  62                NetCopyIP(&NetOurIP, &arp->ar_data[16]);
  63                if (NetServerIP == 0)
  64                        NetCopyIP(&NetServerIP, &arp->ar_data[6]);
  65                memcpy(NetServerEther, &arp->ar_data[0], 6);
  66                debug_cond(DEBUG_DEV_PKT, "Got good RARP\n");
  67                net_auto_load();
  68        }
  69}
  70
  71
  72/*
  73 *      Timeout on BOOTP request.
  74 */
  75static void RarpTimeout(void)
  76{
  77        if (RarpTry >= TIMEOUT_COUNT) {
  78                puts("\nRetry count exceeded; starting again\n");
  79                NetStartAgain();
  80        } else {
  81                NetSetTimeout(TIMEOUT, RarpTimeout);
  82                RarpRequest();
  83        }
  84}
  85
  86
  87void RarpRequest(void)
  88{
  89        uchar *pkt;
  90        struct arp_hdr *rarp;
  91        int eth_hdr_size;
  92
  93        printf("RARP broadcast %d\n", ++RarpTry);
  94        pkt = NetTxPacket;
  95
  96        eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_RARP);
  97        pkt += eth_hdr_size;
  98
  99        rarp = (struct arp_hdr *)pkt;
 100
 101        rarp->ar_hrd = htons(ARP_ETHER);
 102        rarp->ar_pro = htons(PROT_IP);
 103        rarp->ar_hln = 6;
 104        rarp->ar_pln = 4;
 105        rarp->ar_op  = htons(RARPOP_REQUEST);
 106        memcpy(&rarp->ar_data[0],  NetOurEther, 6);     /* source ET addr */
 107        memcpy(&rarp->ar_data[6],  &NetOurIP,   4);     /* source IP addr */
 108        /* dest ET addr = source ET addr ??*/
 109        memcpy(&rarp->ar_data[10], NetOurEther, 6);
 110        /* dest IP addr set to broadcast */
 111        memset(&rarp->ar_data[16], 0xff,        4);
 112
 113        NetSendPacket(NetTxPacket, eth_hdr_size + ARP_HDR_SIZE);
 114
 115        NetSetTimeout(TIMEOUT, RarpTimeout);
 116}
 117