/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <net.h>
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#include <net/tftp.h>
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#include "nfs.h"
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#include "bootp.h"
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#include "rarp.h"
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#define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */
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#ifndef CONFIG_NET_RETRY_COUNT
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#define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
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#else
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#define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
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#endif
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int rarp_try;
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/*
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* Handle a RARP received packet.
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*/
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void rarp_receive(struct ip_udp_hdr *ip, unsigned len)
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{
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struct arp_hdr *arp;
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debug_cond(DEBUG_NET_PKT, "Got RARP\n");
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arp = (struct arp_hdr *)ip;
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if (len < ARP_HDR_SIZE) {
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printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
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return;
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}
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if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
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(ntohs(arp->ar_hrd) != ARP_ETHER) ||
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(ntohs(arp->ar_pro) != PROT_IP) ||
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(arp->ar_hln != 6) || (arp->ar_pln != 4)) {
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puts("invalid RARP header\n");
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} else {
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net_copy_ip(&net_ip, &arp->ar_data[16]);
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if (net_server_ip.s_addr == 0)
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net_copy_ip(&net_server_ip, &arp->ar_data[6]);
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memcpy(net_server_ethaddr, &arp->ar_data[0], 6);
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debug_cond(DEBUG_DEV_PKT, "Got good RARP\n");
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net_auto_load();
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}
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}
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/*
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* Timeout on BOOTP request.
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*/
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static void rarp_timeout_handler(void)
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{
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if (rarp_try >= TIMEOUT_COUNT) {
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puts("\nRetry count exceeded; starting again\n");
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net_start_again();
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} else {
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net_set_timeout_handler(TIMEOUT, rarp_timeout_handler);
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rarp_request();
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}
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}
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void rarp_request(void)
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{
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uchar *pkt;
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struct arp_hdr *rarp;
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int eth_hdr_size;
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printf("RARP broadcast %d\n", ++rarp_try);
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pkt = net_tx_packet;
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eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_RARP);
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pkt += eth_hdr_size;
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rarp = (struct arp_hdr *)pkt;
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rarp->ar_hrd = htons(ARP_ETHER);
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rarp->ar_pro = htons(PROT_IP);
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rarp->ar_hln = 6;
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rarp->ar_pln = 4;
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rarp->ar_op = htons(RARPOP_REQUEST);
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memcpy(&rarp->ar_data[0], net_ethaddr, 6); /* source ET addr */
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memcpy(&rarp->ar_data[6], &net_ip, 4); /* source IP addr */
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/* dest ET addr = source ET addr ??*/
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memcpy(&rarp->ar_data[10], net_ethaddr, 6);
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/* dest IP addr set to broadcast */
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memset(&rarp->ar_data[16], 0xff, 4);
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net_send_packet(net_tx_packet, eth_hdr_size + ARP_HDR_SIZE);
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net_set_timeout_handler(TIMEOUT, rarp_timeout_handler);
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}
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