xref: /openbmc/u-boot/net/rarp.c (revision 1e52fea3)
1 /*
2  * (C) Copyright 2000-2002
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23 
24 #include <common.h>
25 #include <command.h>
26 #include <net.h>
27 #include "nfs.h"
28 #include "bootp.h"
29 #include "rarp.h"
30 #include "tftp.h"
31 
32 #define TIMEOUT		5000UL	/* Milliseconds before trying BOOTP again */
33 #ifndef	CONFIG_NET_RETRY_COUNT
34 # define TIMEOUT_COUNT	5		/* # of timeouts before giving up  */
35 #else
36 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
37 #endif
38 
39 
40 int		RarpTry;
41 
42 /*
43  *	Handle a RARP received packet.
44  */
45 static void
46 RarpHandler(uchar *dummi0, unsigned dummi1, IPaddr_t sip, unsigned dummi2,
47 	    unsigned dummi3)
48 {
49 	debug("Got good RARP\n");
50 	net_auto_load();
51 }
52 
53 
54 /*
55  *	Timeout on BOOTP request.
56  */
57 static void
58 RarpTimeout(void)
59 {
60 	if (RarpTry >= TIMEOUT_COUNT) {
61 		puts ("\nRetry count exceeded; starting again\n");
62 		NetStartAgain ();
63 	} else {
64 		NetSetTimeout (TIMEOUT, RarpTimeout);
65 		RarpRequest ();
66 	}
67 }
68 
69 
70 void
71 RarpRequest (void)
72 {
73 	int i;
74 	volatile uchar *pkt;
75 	ARP_t *	rarp;
76 
77 	printf("RARP broadcast %d\n", ++RarpTry);
78 	pkt = NetTxPacket;
79 
80 	pkt += NetSetEther(pkt, NetBcastAddr, PROT_RARP);
81 
82 	rarp = (ARP_t *)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],  NetOurEther, 6);	/* source ET addr */
90 	memcpy (&rarp->ar_data[6],  &NetOurIP,   4);	/* source IP addr */
91 	memcpy (&rarp->ar_data[10], NetOurEther, 6);	/* dest ET addr = source ET addr ??*/
92 	/* dest. IP addr set to broadcast */
93 	for (i = 0; i <= 3; i++) {
94 		rarp->ar_data[16 + i] = 0xff;
95 	}
96 
97 	NetSendPacket(NetTxPacket, (pkt - NetTxPacket) + ARP_HDR_SIZE);
98 
99 	NetSetTimeout(TIMEOUT, RarpTimeout);
100 	NetSetHandler(RarpHandler);
101 }
102