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

/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 *
 * 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 RarpTry;

/*
 *	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 {
		NetCopyIP(&NetOurIP, &arp->ar_data[16]);
		if (NetServerIP == 0)
			NetCopyIP(&NetServerIP, &arp->ar_data[6]);
		memcpy(NetServerEther, &arp->ar_data[0], 6);
		debug_cond(DEBUG_DEV_PKT, "Got good RARP\n");
		net_auto_load();
	}
}


/*
 *	Timeout on BOOTP request.
 */
static void RarpTimeout(void)
{
	if (RarpTry >= TIMEOUT_COUNT) {
		puts("\nRetry count exceeded; starting again\n");
		NetStartAgain();
	} else {
		NetSetTimeout(TIMEOUT, RarpTimeout);
		RarpRequest();
	}
}


void RarpRequest(void)
{
	uchar *pkt;
	struct arp_hdr *rarp;
	int eth_hdr_size;

	printf("RARP broadcast %d\n", ++RarpTry);
	pkt = NetTxPacket;

	eth_hdr_size = NetSetEther(pkt, NetBcastAddr, 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],  NetOurEther, 6);	/* source ET addr */
	memcpy(&rarp->ar_data[6],  &NetOurIP,   4);	/* source IP addr */
	/* dest ET addr = source ET addr ??*/
	memcpy(&rarp->ar_data[10], NetOurEther, 6);
	/* dest IP addr set to broadcast */
	memset(&rarp->ar_data[16], 0xff,        4);

	NetSendPacket(NetTxPacket, eth_hdr_size + ARP_HDR_SIZE);

	NetSetTimeout(TIMEOUT, RarpTimeout);
}
Commit	Line	Data
affae2bf WD	1	/*
	2	* (C) Copyright 2000-2002
	3	* Wolfgang Denk, DENX Software Engineering, [email protected].
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
affae2bf WD	6	*/
	7
	8	#include <common.h>
	9	#include <command.h>
	10	#include <net.h>
c40b2956	11	#include "nfs.h"
affae2bf WD	12	#include "bootp.h"
	13	#include "rarp.h"
	14	#include "tftp.h"
	15
8b9c5322	16	#define TIMEOUT 5000UL /* Milliseconds before trying BOOTP again */
affae2bf	17	#ifndef CONFIG_NET_RETRY_COUNT
8b9c5322	18	#define TIMEOUT_COUNT 5 /* # of timeouts before giving up */
affae2bf	19	#else
8b9c5322	20	#define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT)
affae2bf WD	21	#endif
affae2bf WD	22
8b9c5322	23	int RarpTry;
affae2bf WD	24
	25	/*
	26	* Handle a RARP received packet.
	27	*/
594c26f8	28	void rarp_receive(struct ip_udp_hdr *ip, unsigned len)
affae2bf	29	{
738853bb	30	struct arp_hdr *arp;
8b9c5322	31
4ef8d53c	32	debug_cond(DEBUG_NET_PKT, "Got RARP\n");
738853bb	33	arp = (struct arp_hdr *)ip;
8b9c5322 JH	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
	44	puts("invalid RARP header\n");
	45	} else {
	46	NetCopyIP(&NetOurIP, &arp->ar_data[16]);
	47	if (NetServerIP == 0)
	48	NetCopyIP(&NetServerIP, &arp->ar_data[6]);
	49	memcpy(NetServerEther, &arp->ar_data[0], 6);
4ef8d53c	50	debug_cond(DEBUG_DEV_PKT, "Got good RARP\n");
8b9c5322 JH	51	net_auto_load();
8b9c5322 JH	52	}
affae2bf WD	53	}
	54
	55
	56	/*
	57	* Timeout on BOOTP request.
	58	*/
8b9c5322	59	static void RarpTimeout(void)
affae2bf WD	60	{
affae2bf WD	61	if (RarpTry >= TIMEOUT_COUNT) {
c2faf4f9 JH	62	puts("\nRetry count exceeded; starting again\n");
c2faf4f9 JH	63	NetStartAgain();
affae2bf	64	} else {
c2faf4f9 JH	65	NetSetTimeout(TIMEOUT, RarpTimeout);
c2faf4f9 JH	66	RarpRequest();
affae2bf WD	67	}
	68	}
	69
	70
8b9c5322	71	void RarpRequest(void)
affae2bf	72	{
db288a96	73	uchar *pkt;
738853bb	74	struct arp_hdr *rarp;
00f33268	75	int eth_hdr_size;
affae2bf WD	76
	77	printf("RARP broadcast %d\n", ++RarpTry);
	78	pkt = NetTxPacket;
	79
00f33268 JH	80	eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_RARP);
00f33268 JH	81	pkt += eth_hdr_size;
affae2bf	82
738853bb	83	rarp = (struct arp_hdr *)pkt;
affae2bf	84
c2faf4f9 JH	85	rarp->ar_hrd = htons(ARP_ETHER);
c2faf4f9 JH	86	rarp->ar_pro = htons(PROT_IP);
affae2bf WD	87	rarp->ar_hln = 6;
affae2bf WD	88	rarp->ar_pln = 4;
c2faf4f9 JH	89	rarp->ar_op = htons(RARPOP_REQUEST);
	90	memcpy(&rarp->ar_data[0], NetOurEther, 6); /* source ET addr */
	91	memcpy(&rarp->ar_data[6], &NetOurIP, 4); /* source IP addr */
	92	/* dest ET addr = source ET addr ??*/
	93	memcpy(&rarp->ar_data[10], NetOurEther, 6);
8b9c5322 JH	94	/* dest IP addr set to broadcast */
8b9c5322 JH	95	memset(&rarp->ar_data[16], 0xff, 4);
affae2bf	96
00f33268	97	NetSendPacket(NetTxPacket, eth_hdr_size + ARP_HDR_SIZE);
affae2bf	98
49f3bdbb	99	NetSetTimeout(TIMEOUT, RarpTimeout);
affae2bf	100	}