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git.ipfire.org Git - thirdparty/u-boot.git/blob - net/rarp.c
1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2000-2002
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
16 #define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */
21 * Handle a RARP received packet.
23 void rarp_receive(struct ip_udp_hdr
*ip
, unsigned len
)
27 debug_cond(DEBUG_NET_PKT
, "Got RARP\n");
28 arp
= (struct arp_hdr
*)ip
;
29 if (len
< ARP_HDR_SIZE
) {
30 printf("bad length %d < %d\n", len
, ARP_HDR_SIZE
);
34 if ((ntohs(arp
->ar_op
) != RARPOP_REPLY
) ||
35 (ntohs(arp
->ar_hrd
) != ARP_ETHER
) ||
36 (ntohs(arp
->ar_pro
) != PROT_IP
) ||
37 (arp
->ar_hln
!= 6) || (arp
->ar_pln
!= 4)) {
38 puts("invalid RARP header\n");
40 net_copy_ip(&net_ip
, &arp
->ar_data
[16]);
41 if (net_server_ip
.s_addr
== 0)
42 net_copy_ip(&net_server_ip
, &arp
->ar_data
[6]);
43 memcpy(net_server_ethaddr
, &arp
->ar_data
[0], 6);
44 debug_cond(DEBUG_DEV_PKT
, "Got good RARP\n");
51 * Timeout on BOOTP request.
53 static void rarp_timeout_handler(void)
55 if (rarp_try
>= CONFIG_NET_RETRY_COUNT
) {
56 puts("\nRetry count exceeded; starting again\n");
59 net_set_timeout_handler(TIMEOUT
, rarp_timeout_handler
);
65 void rarp_request(void)
71 printf("RARP broadcast %d\n", ++rarp_try
);
74 eth_hdr_size
= net_set_ether(pkt
, net_bcast_ethaddr
, PROT_RARP
);
77 rarp
= (struct arp_hdr
*)pkt
;
79 rarp
->ar_hrd
= htons(ARP_ETHER
);
80 rarp
->ar_pro
= htons(PROT_IP
);
83 rarp
->ar_op
= htons(RARPOP_REQUEST
);
84 memcpy(&rarp
->ar_data
[0], net_ethaddr
, 6); /* source ET addr */
85 memcpy(&rarp
->ar_data
[6], &net_ip
, 4); /* source IP addr */
86 /* dest ET addr = source ET addr ??*/
87 memcpy(&rarp
->ar_data
[10], net_ethaddr
, 6);
88 /* dest IP addr set to broadcast */
89 memset(&rarp
->ar_data
[16], 0xff, 4);
91 net_send_packet(net_tx_packet
, eth_hdr_size
+ ARP_HDR_SIZE
);
93 net_set_timeout_handler(TIMEOUT
, rarp_timeout_handler
);