1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * (C) Copyright 2000-2002
3*4882a593Smuzhiyun * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <command.h>
10*4882a593Smuzhiyun #include <net.h>
11*4882a593Smuzhiyun #include <net/tftp.h>
12*4882a593Smuzhiyun #include "nfs.h"
13*4882a593Smuzhiyun #include "bootp.h"
14*4882a593Smuzhiyun #include "rarp.h"
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */
17*4882a593Smuzhiyun #ifndef CONFIG_NET_RETRY_COUNT
18*4882a593Smuzhiyun #define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
19*4882a593Smuzhiyun #else
20*4882a593Smuzhiyun #define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
21*4882a593Smuzhiyun #endif
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun int rarp_try;
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /*
26*4882a593Smuzhiyun * Handle a RARP received packet.
27*4882a593Smuzhiyun */
rarp_receive(struct ip_udp_hdr * ip,unsigned len)28*4882a593Smuzhiyun void rarp_receive(struct ip_udp_hdr *ip, unsigned len)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun struct arp_hdr *arp;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun debug_cond(DEBUG_NET_PKT, "Got RARP\n");
33*4882a593Smuzhiyun arp = (struct arp_hdr *)ip;
34*4882a593Smuzhiyun if (len < ARP_HDR_SIZE) {
35*4882a593Smuzhiyun printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
36*4882a593Smuzhiyun return;
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun if ((ntohs(arp->ar_op) != RARPOP_REPLY) ||
40*4882a593Smuzhiyun (ntohs(arp->ar_hrd) != ARP_ETHER) ||
41*4882a593Smuzhiyun (ntohs(arp->ar_pro) != PROT_IP) ||
42*4882a593Smuzhiyun (arp->ar_hln != 6) || (arp->ar_pln != 4)) {
43*4882a593Smuzhiyun puts("invalid RARP header\n");
44*4882a593Smuzhiyun } else {
45*4882a593Smuzhiyun net_copy_ip(&net_ip, &arp->ar_data[16]);
46*4882a593Smuzhiyun if (net_server_ip.s_addr == 0)
47*4882a593Smuzhiyun net_copy_ip(&net_server_ip, &arp->ar_data[6]);
48*4882a593Smuzhiyun memcpy(net_server_ethaddr, &arp->ar_data[0], 6);
49*4882a593Smuzhiyun debug_cond(DEBUG_DEV_PKT, "Got good RARP\n");
50*4882a593Smuzhiyun net_auto_load();
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun /*
56*4882a593Smuzhiyun * Timeout on BOOTP request.
57*4882a593Smuzhiyun */
rarp_timeout_handler(void)58*4882a593Smuzhiyun static void rarp_timeout_handler(void)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun if (rarp_try >= TIMEOUT_COUNT) {
61*4882a593Smuzhiyun puts("\nRetry count exceeded; starting again\n");
62*4882a593Smuzhiyun net_start_again();
63*4882a593Smuzhiyun } else {
64*4882a593Smuzhiyun net_set_timeout_handler(TIMEOUT, rarp_timeout_handler);
65*4882a593Smuzhiyun rarp_request();
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun
rarp_request(void)70*4882a593Smuzhiyun void rarp_request(void)
71*4882a593Smuzhiyun {
72*4882a593Smuzhiyun uchar *pkt;
73*4882a593Smuzhiyun struct arp_hdr *rarp;
74*4882a593Smuzhiyun int eth_hdr_size;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun printf("RARP broadcast %d\n", ++rarp_try);
77*4882a593Smuzhiyun pkt = net_tx_packet;
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_RARP);
80*4882a593Smuzhiyun pkt += eth_hdr_size;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun rarp = (struct arp_hdr *)pkt;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun rarp->ar_hrd = htons(ARP_ETHER);
85*4882a593Smuzhiyun rarp->ar_pro = htons(PROT_IP);
86*4882a593Smuzhiyun rarp->ar_hln = 6;
87*4882a593Smuzhiyun rarp->ar_pln = 4;
88*4882a593Smuzhiyun rarp->ar_op = htons(RARPOP_REQUEST);
89*4882a593Smuzhiyun memcpy(&rarp->ar_data[0], net_ethaddr, 6); /* source ET addr */
90*4882a593Smuzhiyun memcpy(&rarp->ar_data[6], &net_ip, 4); /* source IP addr */
91*4882a593Smuzhiyun /* dest ET addr = source ET addr ??*/
92*4882a593Smuzhiyun memcpy(&rarp->ar_data[10], net_ethaddr, 6);
93*4882a593Smuzhiyun /* dest IP addr set to broadcast */
94*4882a593Smuzhiyun memset(&rarp->ar_data[16], 0xff, 4);
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun net_send_packet(net_tx_packet, eth_hdr_size + ARP_HDR_SIZE);
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun net_set_timeout_handler(TIMEOUT, rarp_timeout_handler);
99*4882a593Smuzhiyun }
100