[u-boot.git] / net / rarp.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 */

#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);
}
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
affae2bf WD	2	/*
	3	* (C) Copyright 2000-2002
	4	* Wolfgang Denk, DENX Software Engineering, [email protected].
affae2bf WD	5	*/
	6
	7	#include <common.h>
	8	#include <command.h>
	9	#include <net.h>
34696958	10	#include <net/tftp.h>
c40b2956	11	#include "nfs.h"
affae2bf WD	12	#include "bootp.h"
affae2bf WD	13	#include "rarp.h"
affae2bf	14
8b9c5322	15	#define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */
affae2bf	16	#ifndef CONFIG_NET_RETRY_COUNT
8b9c5322	17	#define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
affae2bf	18	#else
8b9c5322	19	#define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
affae2bf WD	20	#endif
affae2bf WD	21
698d78e5	22	int rarp_try;
affae2bf WD	23
	24	/*
	25	* Handle a RARP received packet.
	26	*/
594c26f8	27	void rarp_receive(struct ip_udp_hdr *ip, unsigned len)
affae2bf	28	{
738853bb	29	struct arp_hdr *arp;
8b9c5322	30
4ef8d53c	31	debug_cond(DEBUG_NET_PKT, "Got RARP\n");
738853bb	32	arp = (struct arp_hdr *)ip;
8b9c5322 JH	33	if (len < ARP_HDR_SIZE) {
	34	printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
	35	return;
	36	}
	37
	38	if ((ntohs(arp->ar_op) != RARPOP_REPLY) \|\|
698d78e5 JH	39	(ntohs(arp->ar_hrd) != ARP_ETHER) \|\|
	40	(ntohs(arp->ar_pro) != PROT_IP) \|\|
	41	(arp->ar_hln != 6) \|\| (arp->ar_pln != 4)) {
8b9c5322 JH	42	puts("invalid RARP header\n");
8b9c5322 JH	43	} else {
049a95a7 JH	44	net_copy_ip(&net_ip, &arp->ar_data[16]);
	45	if (net_server_ip.s_addr == 0)
	46	net_copy_ip(&net_server_ip, &arp->ar_data[6]);
0adb5b76	47	memcpy(net_server_ethaddr, &arp->ar_data[0], 6);
4ef8d53c	48	debug_cond(DEBUG_DEV_PKT, "Got good RARP\n");
8b9c5322 JH	49	net_auto_load();
8b9c5322 JH	50	}
affae2bf WD	51	}
	52
	53
	54	/*
	55	* Timeout on BOOTP request.
	56	*/
698d78e5	57	static void rarp_timeout_handler(void)
affae2bf	58	{
698d78e5	59	if (rarp_try >= TIMEOUT_COUNT) {
c2faf4f9	60	puts("\nRetry count exceeded; starting again\n");
bc0571fc	61	net_start_again();
affae2bf	62	} else {
bc0571fc	63	net_set_timeout_handler(TIMEOUT, rarp_timeout_handler);
698d78e5	64	rarp_request();
affae2bf WD	65	}
	66	}
	67
	68
698d78e5	69	void rarp_request(void)
affae2bf	70	{
db288a96	71	uchar *pkt;
738853bb	72	struct arp_hdr *rarp;
00f33268	73	int eth_hdr_size;
affae2bf	74
698d78e5	75	printf("RARP broadcast %d\n", ++rarp_try);
1203fcce	76	pkt = net_tx_packet;
affae2bf	77
1203fcce	78	eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_RARP);
00f33268	79	pkt += eth_hdr_size;
affae2bf	80
738853bb	81	rarp = (struct arp_hdr *)pkt;
affae2bf	82
c2faf4f9 JH	83	rarp->ar_hrd = htons(ARP_ETHER);
c2faf4f9 JH	84	rarp->ar_pro = htons(PROT_IP);
affae2bf WD	85	rarp->ar_hln = 6;
affae2bf WD	86	rarp->ar_pln = 4;
c2faf4f9	87	rarp->ar_op = htons(RARPOP_REQUEST);
0adb5b76	88	memcpy(&rarp->ar_data[0], net_ethaddr, 6); /* source ET addr */
049a95a7	89	memcpy(&rarp->ar_data[6], &net_ip, 4); /* source IP addr */
c2faf4f9	90	/* dest ET addr = source ET addr ??*/
0adb5b76	91	memcpy(&rarp->ar_data[10], net_ethaddr, 6);
8b9c5322 JH	92	/* dest IP addr set to broadcast */
8b9c5322 JH	93	memset(&rarp->ar_data[16], 0xff, 4);
affae2bf	94
1203fcce	95	net_send_packet(net_tx_packet, eth_hdr_size + ARP_HDR_SIZE);
affae2bf	96
bc0571fc	97	net_set_timeout_handler(TIMEOUT, rarp_timeout_handler);
affae2bf	98	}