1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798 |
- // 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);
- }
|