/* * (C) Copyright 2000-2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <command.h> #include <net.h> #include "nfs.h" #include "bootp.h" #include "rarp.h" #include "tftp.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); }