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