net.c 23.4 KB
Newer Older
wdenk's avatar
wdenk committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
/*
 *	Copied from Linux Monitor (LiMon) - Networking.
 *
 *	Copyright 1994 - 2000 Neil Russell.
 *	(See License)
 *	Copyright 2000 Roland Borde
 *	Copyright 2000 Paolo Scaffardi
 *	Copyright 2000-2002 Wolfgang Denk, wd@denx.de
 */

/*
 * General Desription:
 *
 * The user interface supports commands for BOOTP, RARP, and TFTP.
 * Also, we support ARP internally. Depending on available data,
 * these interact as follows:
 *
 * BOOTP:
 *
 *	Prerequisites:	- own ethernet address
 *	We want:	- own IP address
 *			- TFTP server IP address
 *			- name of bootfile
 *	Next step:	ARP
 *
 * RARP:
 *
 *	Prerequisites:	- own ethernet address
 *	We want:	- own IP address
 *			- TFTP server IP address
 *	Next step:	ARP
 *
 * ARP:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *			- TFTP server IP address
 *	We want:	- TFTP server ethernet address
 *	Next step:	TFTP
 *
 * DHCP:
 *
 *     Prerequisites:   - own ethernet address
 *     We want:         - IP, Netmask, ServerIP, Gateway IP
 *                      - bootfilename, lease time
 *     Next step:       - TFTP
 *
 * TFTP:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *			- TFTP server IP address
 *			- TFTP server ethernet address
 *			- name of bootfile (if unknown, we use a default name
 *			  derived from our own IP address)
 *	We want:	- load the boot file
 *	Next step:	none
 */


#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <net.h>
#include "bootp.h"
#include "tftp.h"
#include "rarp.h"

#if (CONFIG_COMMANDS & CFG_CMD_NET)

wdenk's avatar
wdenk committed
71
72
73
74
75
76
77
#define ARP_TIMEOUT		5		/* Seconds before trying ARP again */
#ifndef	CONFIG_NET_RETRY_COUNT
# define ARP_TIMEOUT_COUNT	5		/* # of timeouts before giving up  */
#else
# define ARP_TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
#endif

wdenk's avatar
wdenk committed
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
#if 0
#define ET_DEBUG
#endif

/** BOOTP EXTENTIONS **/

IPaddr_t	NetOurSubnetMask=0;		/* Our subnet mask (0=unknown)	*/
IPaddr_t	NetOurGatewayIP=0;		/* Our gateways IP address	*/
IPaddr_t	NetOurDNSIP=0;			/* Our DNS IP address		*/
char		NetOurNISDomain[32]={0,};	/* Our NIS domain		*/
char		NetOurHostName[32]={0,};	/* Our hostname			*/
char		NetOurRootPath[64]={0,};	/* Our bootpath			*/
ushort		NetBootFileSize=0;		/* Our bootfile size in blocks	*/

/** END OF BOOTP EXTENTIONS **/

ulong		NetBootFileXferSize;	/* The actual transferred size of the bootfile (in bytes) */
uchar		NetOurEther[6];		/* Our ethernet address			*/
uchar		NetServerEther[6] =	/* Boot server enet address		*/
wdenk's avatar
wdenk committed
97
			{ 0, 0, 0, 0, 0, 0 };
wdenk's avatar
wdenk committed
98
99
100
101
102
103
104
IPaddr_t	NetOurIP;		/* Our IP addr (0 = unknown)		*/
IPaddr_t	NetServerIP;		/* Our IP addr (0 = unknown)		*/
volatile uchar *NetRxPkt;		/* Current receive packet		*/
int		NetRxPktLen;		/* Current rx packet length		*/
unsigned	NetIPID;		/* IP packet ID				*/
uchar		NetBcastAddr[6] =	/* Ethernet bcast address		*/
			{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
wdenk's avatar
wdenk committed
105
106
uchar		NetEtherNullAddr[6] =
			{ 0, 0, 0, 0, 0, 0 };
wdenk's avatar
wdenk committed
107
108
109
110
111
112
113
114
115
int		NetState;		/* Network loop state			*/
#ifdef CONFIG_NET_MULTI
int		NetRestartWrap = 0;	/* Tried all network devices		*/
static int	NetRestarted = 0;	/* Network loop restarted		*/
static int	NetDevExists = 0;	/* At least one device configured	*/
#endif

char		BootFile[128];		/* Boot File name			*/

wdenk's avatar
wdenk committed
116
117
118
119
120
121
#if (CONFIG_COMMANDS & CFG_CMD_PING)
IPaddr_t	NetPingIP;		/* the ip address to ping 		*/

static void PingStart(void);
#endif

wdenk's avatar
wdenk committed
122
123
124
125
126
127
128
129
130
131
132
volatile uchar	PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];

volatile uchar *NetRxPackets[PKTBUFSRX]; /* Receive packets			*/

static rxhand_f *packetHandler;		/* Current RX packet handler		*/
static thand_f *timeHandler;		/* Current timeout handler		*/
static ulong	timeValue;		/* Current timeout value		*/
volatile uchar *NetTxPacket = 0;	/* THE transmit packet			*/

static int net_check_prereq (proto_t protocol);

wdenk's avatar
wdenk committed
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
/**********************************************************************/

IPaddr_t	NetArpWaitPacketIP;
IPaddr_t	NetArpWaitReplyIP;
uchar	       *NetArpWaitPacketMAC;	/* MAC address of waiting packet's destination	*/
uchar          *NetArpWaitTxPacket;	/* THE transmit packet			*/
int		NetArpWaitTxPacketSize;
uchar 		NetArpWaitPacketBuf[PKTSIZE_ALIGN + PKTALIGN];
ulong		NetArpWaitTimerStart;
int		NetArpWaitTry;

void ArpRequest(void)
{
	int i;
	volatile uchar *pkt;
	ARP_t *	arp;

#ifdef ET_DEBUG
	printf("ARP broadcast %d\n", NetArpWaitTry);
#endif
	pkt = NetTxPacket;

	NetSetEther(pkt, NetBcastAddr, PROT_ARP);
	pkt += ETHER_HDR_SIZE;

	arp = (ARP_t *)pkt;

	arp->ar_hrd = htons(ARP_ETHER);
	arp->ar_pro = htons(PROT_IP);
	arp->ar_hln = 6;
	arp->ar_pln = 4;
	arp->ar_op  = htons(ARPOP_REQUEST);

	memcpy (&arp->ar_data[0], NetOurEther, 6);	/* source ET addr	*/
	NetWriteIP((uchar*)&arp->ar_data[6], NetOurIP);	/* source IP addr	*/
	for (i=10; i<16; ++i) {
		arp->ar_data[i] = 0;			/* dest ET addr = 0	*/
	}

	if((NetArpWaitPacketIP & NetOurSubnetMask) != (NetOurIP & NetOurSubnetMask)) {
	    if (NetOurGatewayIP == 0) {
		puts ("## Warning: gatewayip needed but not set\n");
	    }
	    NetArpWaitReplyIP = NetOurGatewayIP;
	} else
            NetArpWaitReplyIP = NetArpWaitPacketIP;

        NetWriteIP((uchar*)&arp->ar_data[16], NetArpWaitReplyIP);
	(void) eth_send(NetTxPacket, ETHER_HDR_SIZE + ARP_HDR_SIZE);
}

void ArpTimeoutCheck(void)
{
	ulong t;

	if (!NetArpWaitPacketIP)
		return;

	t = get_timer(0);

	/* check for arp timeout */
	if ((t - NetArpWaitTimerStart) > ARP_TIMEOUT * CFG_HZ) {
		NetArpWaitTry++;

		if (NetArpWaitTry >= ARP_TIMEOUT_COUNT) {
			puts ("\nARP Retry count exceeded; starting again\n");
			NetArpWaitTry = 0;
			NetStartAgain();
		} else {
			NetArpWaitTimerStart = t;
			ArpRequest();
		}
	}
}

wdenk's avatar
wdenk committed
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/**********************************************************************/
/*
 *	Main network processing loop.
 */

int
NetLoop(proto_t protocol)
{
	DECLARE_GLOBAL_DATA_PTR;

	bd_t *bd = gd->bd;

#ifdef CONFIG_NET_MULTI
	NetRestarted = 0;
	NetDevExists = 0;
#endif

wdenk's avatar
wdenk committed
225
226
227
228
229
230
231
232
	/* XXX problem with bss workaround */
	NetArpWaitPacketMAC = NULL;
	NetArpWaitTxPacket = NULL;
	NetArpWaitPacketIP = 0;
	NetArpWaitReplyIP = 0;
	NetArpWaitTxPacket = NULL;
	NetTxPacket = NULL;

wdenk's avatar
wdenk committed
233
234
235
236
237
238
239
240
241
242
243
	if (!NetTxPacket) {
		int	i;

		/*
		 *	Setup packet buffers, aligned correctly.
		 */
		NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
		NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
		for (i = 0; i < PKTBUFSRX; i++) {
			NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
		}
wdenk's avatar
wdenk committed
244
245
246
247
248
249
250

	}

	if (!NetArpWaitTxPacket) {
		NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
		NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
		NetArpWaitTxPacketSize = 0;
wdenk's avatar
wdenk committed
251
252
253
	}

	eth_halt();
254
255
	if(eth_init(bd) < 0)
	    return(-1);
wdenk's avatar
wdenk committed
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272

restart:
#ifdef CONFIG_NET_MULTI
	memcpy (NetOurEther, eth_get_dev()->enetaddr, 6);
#else
	memcpy (NetOurEther, bd->bi_enetaddr, 6);
#endif

	NetState = NETLOOP_CONTINUE;

	/*
	 *	Start the ball rolling with the given start function.  From
	 *	here on, this code is a state machine driven by received
	 *	packets and timer events.
	 */

	switch (protocol) {
wdenk's avatar
wdenk committed
273
274
275
#if (CONFIG_COMMANDS & CFG_CMD_PING)
	case PING:
#endif
wdenk's avatar
wdenk committed
276
277
278
279
	case TFTP:
		NetCopyIP(&NetOurIP, &bd->bi_ip_addr);
		NetOurGatewayIP = getenv_IPaddr ("gatewayip");
		NetOurSubnetMask= getenv_IPaddr ("netmask");
wdenk's avatar
wdenk committed
280
281
282
283
284
285
286
287
288
289
290
291
292
293

		switch (protocol) {
		case TFTP:
			NetServerIP = getenv_IPaddr ("serverip");
			break;
#if (CONFIG_COMMANDS & CFG_CMD_PING)
		case PING:
			/* nothing */
			break;
#endif
		default:
			break;
		}

wdenk's avatar
wdenk committed
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
		break;
	case BOOTP:
	case RARP:
		/*
                 * initialize our IP addr to 0 in order to accept ANY
                 * IP addr assigned to us by the BOOTP / RARP server
		 */
		NetOurIP = 0;
		NetServerIP = 0;
		break;
	default:
		break;
	}

	switch (net_check_prereq (protocol)) {
	case 1:
		/* network not configured */
wdenk's avatar
wdenk committed
311
		return (-1);
wdenk's avatar
wdenk committed
312
313
314
315
316
317
318
319
320
321
322
323
324
325

#ifdef CONFIG_NET_MULTI
	case 2:
		/* network device not configured */
		break;
#endif /* CONFIG_NET_MULTI */

	case 0:
#ifdef CONFIG_NET_MULTI
		NetDevExists = 1;
#endif
		switch (protocol) {
		case TFTP:
			/* always use ARP to get server ethernet address */
wdenk's avatar
wdenk committed
326
			TftpStart();
wdenk's avatar
wdenk committed
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
			break;

#if (CONFIG_COMMANDS & CFG_CMD_DHCP)
		case DHCP:
			/* Start with a clean slate... */
			NetOurIP = 0;
			NetServerIP = 0;
			DhcpRequest();		/* Basically same as BOOTP */
			break;
#endif /* CFG_CMD_DHCP */

		case BOOTP:
			BootpTry = 0;
			BootpRequest ();
			break;

		case RARP:
			RarpTry = 0;
			RarpRequest ();
			break;
wdenk's avatar
wdenk committed
347
348
349
350
351
#if (CONFIG_COMMANDS & CFG_CMD_PING)
		case PING:
			PingStart();
			break;
#endif
wdenk's avatar
wdenk committed
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
		default:
			break;
		}

		NetBootFileXferSize = 0;
		break;
	}


	/*
	 *	Main packet reception loop.  Loop receiving packets until
	 *	someone sets `NetQuit'.
	 */
	for (;;) {
		WATCHDOG_RESET();
#ifdef CONFIG_SHOW_ACTIVITY
		{
			extern void show_activity(int arg);
			show_activity(1);
		}
#endif
		/*
		 *	Check the ethernet for a new packet.  The ethernet
		 *	receive routine will process it.
		 */
			eth_rx();

		/*
		 *	Abort if ctrl-c was pressed.
		 */
		if (ctrlc()) {
		        eth_halt();
			printf("\nAbort\n");
wdenk's avatar
wdenk committed
385
			return (-1);
wdenk's avatar
wdenk committed
386
387
		}

wdenk's avatar
wdenk committed
388
		ArpTimeoutCheck();
wdenk's avatar
wdenk committed
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423

		/*
		 *	Check for a timeout, and run the timeout handler
		 *	if we have one.
		 */
		if (timeHandler && (get_timer(0) > timeValue)) {
			thand_f *x;

			x = timeHandler;
			timeHandler = (thand_f *)0;
			(*x)();
		}


		switch (NetState) {

		case NETLOOP_RESTART:
#ifdef CONFIG_NET_MULTI
			NetRestarted = 1;
#endif
			goto restart;

		case NETLOOP_SUCCESS:
			if (NetBootFileXferSize > 0) {
				char buf[10];
				printf("Bytes transferred = %ld (%lx hex)\n",
					NetBootFileXferSize,
					NetBootFileXferSize);
				sprintf(buf, "%lx", NetBootFileXferSize);
				setenv("filesize", buf);
			}
			eth_halt();
			return NetBootFileXferSize;

		case NETLOOP_FAIL:
wdenk's avatar
wdenk committed
424
			return (-1);
wdenk's avatar
wdenk committed
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
		}
	}
}

/**********************************************************************/

static void
startAgainTimeout(void)
{
	NetState = NETLOOP_RESTART;
}

static void
startAgainHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
	/* Totally ignore the packet */
}

void
NetStartAgain(void)
{
#ifndef CONFIG_NET_MULTI
	NetSetTimeout(10 * CFG_HZ, startAgainTimeout);
	NetSetHandler(startAgainHandler);
#else
	DECLARE_GLOBAL_DATA_PTR;

	eth_halt();
	eth_try_another(!NetRestarted);
	eth_init(gd->bd);
	if (NetRestartWrap)
	{
		NetRestartWrap = 0;
		if (NetDevExists)
		{
			NetSetTimeout(10 * CFG_HZ, startAgainTimeout);
			NetSetHandler(startAgainHandler);
		}
		else
		{
			NetState = NETLOOP_FAIL;
		}
	}
	else
	{
		NetState = NETLOOP_RESTART;
	}
#endif
}

/**********************************************************************/
/*
 *	Miscelaneous bits.
 */

void
NetSetHandler(rxhand_f * f)
{
	packetHandler = f;
}


void
NetSetTimeout(int iv, thand_f * f)
{
	if (iv == 0) {
		timeHandler = (thand_f *)0;
	} else {
		timeHandler = f;
		timeValue = get_timer(0) + iv;
	}
}


void
NetSendPacket(volatile uchar * pkt, int len)
{
	(void) eth_send(pkt, len);
}

wdenk's avatar
wdenk committed
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
int
NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
{
	/* convert to new style broadcast */
	if (dest == 0)
		dest = 0xFFFFFFFF;

	/* if broadcast, make the ether address a broadcast and don't do ARP */
	if (dest == 0xFFFFFFFF)
		ether = NetBcastAddr;

	/* if MAC address was not discovered yet, save the packet and do an ARP request */
	if (memcmp(ether, NetEtherNullAddr, 6) == 0) {

#ifdef ET_DEBUG
		printf("sending ARP for %08lx\n", dest);
#endif

		NetArpWaitPacketIP = dest;
		NetArpWaitPacketMAC = ether;
		NetSetEther (NetArpWaitTxPacket, NetArpWaitPacketMAC, PROT_IP);
		NetSetIP (NetArpWaitTxPacket + ETHER_HDR_SIZE, dest, dport, sport, len);
		memcpy(NetArpWaitTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE,
			(uchar *)NetTxPacket + ETHER_HDR_SIZE + IP_HDR_SIZE, len);

		/* size of the waiting packet */
		NetArpWaitTxPacketSize = ETHER_HDR_SIZE + IP_HDR_SIZE + len;

		/* and do the ARP request */
		NetArpWaitTry = 1;
		NetArpWaitTimerStart = get_timer(0);
		ArpRequest();
		return 1;	/* waiting */
	}

#ifdef ET_DEBUG
	printf("sending UDP to %08lx/%02x:%02x:%02x:%02x:%02x:%02x\n",
			dest, ether[0], ether[1], ether[2], ether[3], ether[4], ether[5]);
#endif

	NetSetEther (NetTxPacket, ether, PROT_IP);
	NetSetIP (NetTxPacket + ETHER_HDR_SIZE, dest, dport, sport, len);
	(void) eth_send(NetTxPacket, ETHER_HDR_SIZE + IP_HDR_SIZE + len);

	return 0;	/* transmited */
}

#if (CONFIG_COMMANDS & CFG_CMD_PING)
static ushort PingSeqNo;

int PingSend(void)
{
	static uchar mac[6];
	volatile IP_t *ip;
	volatile ushort *s;

	/* XXX always send arp request */

	memcpy(mac, NetEtherNullAddr, 6);

#ifdef ET_DEBUG
	printf("sending ARP for %08lx\n", NetPingIP);
#endif

	NetArpWaitPacketIP = NetPingIP;
	NetArpWaitPacketMAC = mac;

	NetSetEther(NetArpWaitTxPacket, mac, PROT_IP);

	ip = (volatile IP_t *)(NetArpWaitTxPacket + ETHER_HDR_SIZE);

	/*
	 *	Construct an IP and ICMP header.  (need to set no fragment bit - XXX)
	 */
	ip->ip_hl_v  = 0x45;		/* IP_HDR_SIZE / 4 (not including UDP) */
	ip->ip_tos   = 0;
	ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
	ip->ip_id    = htons(NetIPID++);
	ip->ip_off   = htons(0x4000);	/* No fragmentation */
	ip->ip_ttl   = 255;
	ip->ip_p     = 0x01;		/* ICMP */
	ip->ip_sum   = 0;
	NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
	NetCopyIP((void*)&ip->ip_dst, &NetPingIP);	   /* - "" - */
	ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);

	s = &ip->udp_src;		/* XXX ICMP starts here */
	s[0] = htons(0x0800);		/* echo-request, code */
	s[1] = 0;			/* checksum */
	s[2] = 0; 			/* identifier */
	s[3] = htons(PingSeqNo++);	/* sequence number */
	s[1] = ~NetCksum((uchar *)s, 8/2);

	/* size of the waiting packet */
	NetArpWaitTxPacketSize = ETHER_HDR_SIZE + IP_HDR_SIZE_NO_UDP + 8;

	/* and do the ARP request */
	NetArpWaitTry = 1;
	NetArpWaitTimerStart = get_timer(0);
	ArpRequest();
	return 1;	/* waiting */
}

static void
PingTimeout (void)
{
	eth_halt();
	NetState = NETLOOP_FAIL;	/* we did not get the reply */
}
wdenk's avatar
wdenk committed
614

wdenk's avatar
wdenk committed
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
static void
PingHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
	IPaddr_t tmp;
	volatile IP_t *ip = (volatile IP_t *)pkt;

	tmp = NetReadIP((void *)&ip->ip_src);
	if (tmp != NetPingIP)
		return;

	NetState = NETLOOP_SUCCESS;
}

static void PingStart(void)
{
	NetSetTimeout (10 * CFG_HZ, PingTimeout);
	NetSetHandler (PingHandler);

	PingSend();
}

#endif
wdenk's avatar
wdenk committed
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720

void
NetReceive(volatile uchar * pkt, int len)
{
	Ethernet_t *et;
	IP_t	*ip;
	ARP_t	*arp;
	IPaddr_t tmp;
	int	x;

	NetRxPkt = pkt;
	NetRxPktLen = len;
	et = (Ethernet_t *)pkt;

	x = ntohs(et->et_protlen);

	if (x < 1514) {
		/*
		 *	Got a 802 packet.  Check the other protocol field.
		 */
		x = ntohs(et->et_prot);
		ip = (IP_t *)(pkt + E802_HDR_SIZE);
		len -= E802_HDR_SIZE;
	} else {
		ip = (IP_t *)(pkt + ETHER_HDR_SIZE);
		len -= ETHER_HDR_SIZE;
	}

#ifdef ET_DEBUG
	printf("Receive from protocol 0x%x\n", x);
#endif

	switch (x) {

	case PROT_ARP:
		/*
		 * We have to deal with two types of ARP packets:
                 * - REQUEST packets will be answered by sending  our
                 *   IP address - if we know it.
                 * - REPLY packates are expected only after we asked
                 *   for the TFTP server's or the gateway's ethernet
                 *   address; so if we receive such a packet, we set
                 *   the server ethernet address
		 */
#ifdef ET_DEBUG
		printf("Got ARP\n");
#endif
		arp = (ARP_t *)ip;
		if (len < ARP_HDR_SIZE) {
			printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
			return;
		}
		if (ntohs(arp->ar_hrd) != ARP_ETHER) {
			return;
		}
		if (ntohs(arp->ar_pro) != PROT_IP) {
			return;
		}
		if (arp->ar_hln != 6) {
			return;
		}
		if (arp->ar_pln != 4) {
			return;
		}

		if (NetOurIP == 0) {
			return;
		}

		if (NetReadIP(&arp->ar_data[16]) != NetOurIP) {
			return;
		}

		switch (ntohs(arp->ar_op)) {
		case ARPOP_REQUEST:		/* reply with our IP address	*/
#ifdef ET_DEBUG
			printf("Got ARP REQUEST, return our IP\n");
#endif
			NetSetEther((uchar *)et, et->et_src, PROT_ARP);
			arp->ar_op = htons(ARPOP_REPLY);
			memcpy   (&arp->ar_data[10], &arp->ar_data[0], 6);
			NetCopyIP(&arp->ar_data[16], &arp->ar_data[6]);
			memcpy   (&arp->ar_data[ 0], NetOurEther, 6);
			NetCopyIP(&arp->ar_data[ 6], &NetOurIP);
wdenk's avatar
wdenk committed
721
			(void) eth_send((uchar *)et, ((uchar *)arp-pkt) + ARP_HDR_SIZE);
wdenk's avatar
wdenk committed
722
			return;
wdenk's avatar
wdenk committed
723
724
725
726
727

		case ARPOP_REPLY:		/* arp reply */
			/* are we waiting for a reply */
			if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
				break;
wdenk's avatar
wdenk committed
728
#ifdef ET_DEBUG
wdenk's avatar
wdenk committed
729
730
731
732
			printf("Got ARP REPLY, set server/gtwy eth addr (%02x:%02x:%02x:%02x:%02x:%02x)\n",
				arp->ar_data[0], arp->ar_data[1],
				arp->ar_data[2], arp->ar_data[3],
				arp->ar_data[4], arp->ar_data[5]);
wdenk's avatar
wdenk committed
733
#endif
wdenk's avatar
wdenk committed
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754

			tmp = NetReadIP(&arp->ar_data[6]);

			/* matched waiting packet's address */
			if (tmp == NetArpWaitReplyIP) {
#ifdef ET_DEBUG
				printf("Got it\n");
#endif
				/* save address for later use */
				memcpy(NetArpWaitPacketMAC, &arp->ar_data[0], 6);

				/* modify header, and transmit it */
				memcpy(((Ethernet_t *)NetArpWaitTxPacket)->et_dest, NetArpWaitPacketMAC, 6);
				(void) eth_send(NetArpWaitTxPacket, NetArpWaitTxPacketSize);

				/* no arp request pending now */
				NetArpWaitPacketIP = 0;
				NetArpWaitTxPacketSize = 0;
				NetArpWaitPacketMAC = NULL;

			}
wdenk's avatar
wdenk committed
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
			return;
		default:
#ifdef ET_DEBUG
			printf("Unexpected ARP opcode 0x%x\n", ntohs(arp->ar_op));
#endif
			return;
		}

	case PROT_RARP:
#ifdef ET_DEBUG
		printf("Got RARP\n");
#endif
		arp = (ARP_t *)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)) {

			printf("invalid RARP header\n");
		} else {
			NetCopyIP(&NetOurIP,    &arp->ar_data[16]);
			NetCopyIP(&NetServerIP, &arp->ar_data[ 6]);
			memcpy (NetServerEther, &arp->ar_data[ 0], 6);

			(*packetHandler)(0,0,0,0);
		}
		break;

	case PROT_IP:
#ifdef ET_DEBUG
		printf("Got IP\n");
#endif
		if (len < IP_HDR_SIZE) {
			debug ("len bad %d < %d\n", len, IP_HDR_SIZE);
			return;
		}
		if (len < ntohs(ip->ip_len)) {
			printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
			return;
		}
		len = ntohs(ip->ip_len);
#ifdef ET_DEBUG
		printf("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
#endif
		if ((ip->ip_hl_v & 0xf0) != 0x40) {
			return;
		}
		if (ip->ip_off & htons(0x1fff)) { /* Can't deal w/ fragments */
			return;
		}
		if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
			printf("checksum bad\n");
			return;
		}
		tmp = NetReadIP(&ip->ip_dst);
		if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
			return;
		}
		/*
		 * watch for ICMP host redirects
		 *
                 * There is no real handler code (yet). We just watch
                 * for ICMP host redirect messages. In case anybody
                 * sees these messages: please contact me
                 * (wd@denx.de), or - even better - send me the
                 * necessary fixes :-)
		 *
                 * Note: in all cases where I have seen this so far
                 * it was a problem with the router configuration,
                 * for instance when a router was configured in the
                 * BOOTP reply, but the TFTP server was on the same
                 * subnet. So this is probably a warning that your
                 * configuration might be wrong. But I'm not really
                 * sure if there aren't any other situations.
		 */
		if (ip->ip_p == IPPROTO_ICMP) {
			ICMP_t *icmph = (ICMP_t *)&(ip->udp_src);

wdenk's avatar
wdenk committed
838
839
			switch (icmph->type) {
			case ICMP_REDIRECT:
wdenk's avatar
wdenk committed
840
841
842
843
844
			if (icmph->code != ICMP_REDIR_HOST)
				return;
			puts (" ICMP Host Redirect to ");
			print_IPaddr(icmph->un.gateway);
			putc(' ');
wdenk's avatar
wdenk committed
845
846
847
848
849
850
851
852
853
854
855
856
857
				break;
#if (CONFIG_COMMANDS & CFG_CMD_PING)
			case ICMP_ECHO_REPLY:
				/*
				 *	IP header OK.  Pass the packet to the current handler.
				 */
				/* XXX point to ip packet */
				(*packetHandler)((uchar *)ip, 0, 0, 0);
				break;
#endif
			default:
				return;
			}
wdenk's avatar
wdenk committed
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
		} else if (ip->ip_p != IPPROTO_UDP) {	/* Only UDP packets */
			return;
		}

		/*
		 *	IP header OK.  Pass the packet to the current handler.
		 */
		(*packetHandler)((uchar *)ip +IP_HDR_SIZE,
						ntohs(ip->udp_dst),
						ntohs(ip->udp_src),
						ntohs(ip->udp_len) - 8);

		break;
	}
}


/**********************************************************************/

static int net_check_prereq (proto_t protocol)
{
	switch (protocol) {
wdenk's avatar
wdenk committed
880
881
882
883
884
885
886
887
888
			/* Fall through */
#if (CONFIG_COMMANDS & CFG_CMD_PING)
	case PING:
			if (NetPingIP == 0) {
				puts ("*** ERROR: ping address not given\n");
				return (1);
			}
			goto common;
#endif
wdenk's avatar
wdenk committed
889
890
891
892
893
894
	case TFTP:
			if (NetServerIP == 0) {
				puts ("*** ERROR: `serverip' not set\n");
				return (1);
			}

wdenk's avatar
wdenk committed
895
896
897
898
#if (CONFIG_COMMANDS & CFG_CMD_PING)
		common:
#endif

wdenk's avatar
wdenk committed
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
			if (NetOurIP == 0) {
				puts ("*** ERROR: `ipaddr' not set\n");
				return (1);
			}
			/* Fall through */

	case DHCP:
	case RARP:
	case BOOTP:
			if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
#ifdef CONFIG_NET_MULTI
			    extern int eth_get_dev_index (void);
			    int num = eth_get_dev_index();

			    switch (num) {
			    case -1:
				puts ("*** ERROR: No ethernet found.\n");
				return (1);
			    case 0:
				puts ("*** ERROR: `ethaddr' not set\n");
				break;
			    default:
			        printf ("*** ERROR: `eth%daddr' not set\n",
					num);
				break;
			    }

			    NetStartAgain ();
			    return (2);
#else
			    puts ("*** ERROR: `ethaddr' not set\n");
			    return (1);
#endif
			}
			/* Fall through */
wdenk's avatar
wdenk committed
934
935
		default:
			return(0);
wdenk's avatar
wdenk committed
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
	}
	return (0);	/* OK */
}
/**********************************************************************/

int
NetCksumOk(uchar * ptr, int len)
{
	return !((NetCksum(ptr, len) + 1) & 0xfffe);
}


unsigned
NetCksum(uchar * ptr, int len)
{
	ulong	xsum;

	xsum = 0;
	while (len-- > 0)
		xsum += *((ushort *)ptr)++;
	xsum = (xsum & 0xffff) + (xsum >> 16);
	xsum = (xsum & 0xffff) + (xsum >> 16);
	return (xsum & 0xffff);
}


void
NetSetEther(volatile uchar * xet, uchar * addr, uint prot)
{
	Ethernet_t *et = (Ethernet_t *)xet;

	memcpy (et->et_dest, addr, 6);
	memcpy (et->et_src, NetOurEther, 6);
	et->et_protlen = htons(prot);
}


void
NetSetIP(volatile uchar * xip, IPaddr_t dest, int dport, int sport, int len)
{
	volatile IP_t *ip = (IP_t *)xip;

	/*
	 *	If the data is an odd number of bytes, zero the
	 *	byte after the last byte so that the checksum
	 *	will work.
	 */
	if (len & 1)
		xip[IP_HDR_SIZE + len] = 0;

	/*
	 *	Construct an IP and UDP header.
			(need to set no fragment bit - XXX)
	 */
	ip->ip_hl_v  = 0x45;		/* IP_HDR_SIZE / 4 (not including UDP) */
	ip->ip_tos   = 0;
	ip->ip_len   = htons(IP_HDR_SIZE + len);
	ip->ip_id    = htons(NetIPID++);
	ip->ip_off   = htons(0x4000);	/* No fragmentation */
	ip->ip_ttl   = 255;
	ip->ip_p     = 17;		/* UDP */
	ip->ip_sum   = 0;
	NetCopyIP((void*)&ip->ip_src, &NetOurIP); /* already in network byte order */
	NetCopyIP((void*)&ip->ip_dst, &dest);	   /* - "" - */
	ip->udp_src  = htons(sport);