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