summaryrefslogtreecommitdiff
path: root/net/net.c
blob: 084269e31ecf65bad2aa190c075d755be928cef8 (plain)
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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
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
385
386
387
388
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
424
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
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
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
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
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
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
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
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
934
935
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
// SPDX-License-Identifier: GPL-2.0
/*
 *	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
 *
 * LINK_LOCAL:
 *
 *	Prerequisites:	- own ethernet address
 *	We want:	- own IP address
 *	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
 *
 * NFS:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP 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
 *
 * SNTP:
 *
 *	Prerequisites:	- own ethernet address
 *			- own IP address
 *	We want:	- network time
 *	Next step:	none
 *
 * WOL:
 *
 *	Prerequisites:	- own ethernet address
 *	We want:	- magic packet or timeout
 *	Next step:	none
 */


#include <common.h>
#include <command.h>
#include <console.h>
#include <environment.h>
#include <errno.h>
#include <net.h>
#include <net/fastboot.h>
#include <net/tftp.h>
#if defined(CONFIG_LED_STATUS)
#include <miiphy.h>
#include <status_led.h>
#endif
#include <watchdog.h>
#include <linux/compiler.h>
#include "arp.h"
#include "bootp.h"
#include "cdp.h"
#if defined(CONFIG_CMD_DNS)
#include "dns.h"
#endif
#include "link_local.h"
#include "nfs.h"
#include "ping.h"
#include "rarp.h"
#if defined(CONFIG_CMD_SNTP)
#include "sntp.h"
#endif
#if defined(CONFIG_CMD_WOL)
#include "wol.h"
#endif

/** BOOTP EXTENTIONS **/

/* Our subnet mask (0=unknown) */
struct in_addr net_netmask;
/* Our gateways IP address */
struct in_addr net_gateway;
/* Our DNS IP address */
struct in_addr net_dns_server;
#if defined(CONFIG_BOOTP_DNS2)
/* Our 2nd DNS IP address */
struct in_addr net_dns_server2;
#endif

#ifdef CONFIG_MCAST_TFTP	/* Multicast TFTP */
struct in_addr net_mcast_addr;
#endif

/** END OF BOOTP EXTENTIONS **/

/* Our ethernet address */
u8 net_ethaddr[6];
/* Boot server enet address */
u8 net_server_ethaddr[6];
/* Our IP addr (0 = unknown) */
struct in_addr	net_ip;
/* Server IP addr (0 = unknown) */
struct in_addr	net_server_ip;
/* Current receive packet */
uchar *net_rx_packet;
/* Current rx packet length */
int		net_rx_packet_len;
/* IP packet ID */
static unsigned	net_ip_id;
/* Ethernet bcast address */
const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
const u8 net_null_ethaddr[6];
#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
void (*push_packet)(void *, int len) = 0;
#endif
/* Network loop state */
enum net_loop_state net_state;
/* Tried all network devices */
int		net_restart_wrap;
/* Network loop restarted */
static int	net_restarted;
/* At least one device configured */
static int	net_dev_exists;

/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
/* default is without VLAN */
ushort		net_our_vlan = 0xFFFF;
/* ditto */
ushort		net_native_vlan = 0xFFFF;

/* Boot File name */
char net_boot_file_name[1024];
/* The actual transferred size of the bootfile (in bytes) */
u32 net_boot_file_size;
/* Boot file size in blocks as reported by the DHCP server */
u32 net_boot_file_expected_size_in_blocks;

#if defined(CONFIG_CMD_SNTP)
/* NTP server IP address */
struct in_addr	net_ntp_server;
/* offset time from UTC */
int		net_ntp_time_offset;
#endif

static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
/* Receive packets */
uchar *net_rx_packets[PKTBUFSRX];
/* Current UDP RX packet handler */
static rxhand_f *udp_packet_handler;
/* Current ARP RX packet handler */
static rxhand_f *arp_packet_handler;
#ifdef CONFIG_CMD_TFTPPUT
/* Current ICMP rx handler */
static rxhand_icmp_f *packet_icmp_handler;
#endif
/* Current timeout handler */
static thand_f *time_handler;
/* Time base value */
static ulong	time_start;
/* Current timeout value */
static ulong	time_delta;
/* THE transmit packet */
uchar *net_tx_packet;

static int net_check_prereq(enum proto_t protocol);

static int net_try_count;

int __maybe_unused net_busy_flag;

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

static int on_bootfile(const char *name, const char *value, enum env_op op,
	int flags)
{
	if (flags & H_PROGRAMMATIC)
		return 0;

	switch (op) {
	case env_op_create:
	case env_op_overwrite:
		copy_filename(net_boot_file_name, value,
			      sizeof(net_boot_file_name));
		break;
	default:
		break;
	}

	return 0;
}
U_BOOT_ENV_CALLBACK(bootfile, on_bootfile);

static int on_ipaddr(const char *name, const char *value, enum env_op op,
	int flags)
{
	if (flags & H_PROGRAMMATIC)
		return 0;

	net_ip = string_to_ip(value);

	return 0;
}
U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr);

static int on_gatewayip(const char *name, const char *value, enum env_op op,
	int flags)
{
	if (flags & H_PROGRAMMATIC)
		return 0;

	net_gateway = string_to_ip(value);

	return 0;
}
U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip);

static int on_netmask(const char *name, const char *value, enum env_op op,
	int flags)
{
	if (flags & H_PROGRAMMATIC)
		return 0;

	net_netmask = string_to_ip(value);

	return 0;
}
U_BOOT_ENV_CALLBACK(netmask, on_netmask);

static int on_serverip(const char *name, const char *value, enum env_op op,
	int flags)
{
	if (flags & H_PROGRAMMATIC)
		return 0;

	net_server_ip = string_to_ip(value);

	return 0;
}
U_BOOT_ENV_CALLBACK(serverip, on_serverip);

static int on_nvlan(const char *name, const char *value, enum env_op op,
	int flags)
{
	if (flags & H_PROGRAMMATIC)
		return 0;

	net_native_vlan = string_to_vlan(value);

	return 0;
}
U_BOOT_ENV_CALLBACK(nvlan, on_nvlan);

static int on_vlan(const char *name, const char *value, enum env_op op,
	int flags)
{
	if (flags & H_PROGRAMMATIC)
		return 0;

	net_our_vlan = string_to_vlan(value);

	return 0;
}
U_BOOT_ENV_CALLBACK(vlan, on_vlan);

#if defined(CONFIG_CMD_DNS)
static int on_dnsip(const char *name, const char *value, enum env_op op,
	int flags)
{
	if (flags & H_PROGRAMMATIC)
		return 0;

	net_dns_server = string_to_ip(value);

	return 0;
}
U_BOOT_ENV_CALLBACK(dnsip, on_dnsip);
#endif

/*
 * Check if autoload is enabled. If so, use either NFS or TFTP to download
 * the boot file.
 */
void net_auto_load(void)
{
#if defined(CONFIG_CMD_NFS)
	const char *s = env_get("autoload");

	if (s != NULL && strcmp(s, "NFS") == 0) {
		/*
		 * Use NFS to load the bootfile.
		 */
		nfs_start();
		return;
	}
#endif
	if (env_get_yesno("autoload") == 0) {
		/*
		 * Just use BOOTP/RARP to configure system;
		 * Do not use TFTP to load the bootfile.
		 */
		net_set_state(NETLOOP_SUCCESS);
		return;
	}
	tftp_start(TFTPGET);
}

static void net_init_loop(void)
{
	if (eth_get_dev())
		memcpy(net_ethaddr, eth_get_ethaddr(), 6);

	return;
}

static void net_clear_handlers(void)
{
	net_set_udp_handler(NULL);
	net_set_arp_handler(NULL);
	net_set_timeout_handler(0, NULL);
}

static void net_cleanup_loop(void)
{
	net_clear_handlers();
}

void net_init(void)
{
	static int first_call = 1;

	if (first_call) {
		/*
		 *	Setup packet buffers, aligned correctly.
		 */
		int i;

		net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1);
		net_tx_packet -= (ulong)net_tx_packet % PKTALIGN;
		for (i = 0; i < PKTBUFSRX; i++) {
			net_rx_packets[i] = net_tx_packet +
				(i + 1) * PKTSIZE_ALIGN;
		}
		arp_init();
		net_clear_handlers();

		/* Only need to setup buffer pointers once. */
		first_call = 0;
	}

	net_init_loop();
}

/**********************************************************************/
/*
 *	Main network processing loop.
 */

int net_loop(enum proto_t protocol)
{
	int ret = -EINVAL;
	enum net_loop_state prev_net_state = net_state;

	net_restarted = 0;
	net_dev_exists = 0;
	net_try_count = 1;
	debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n");

	bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
	net_init();
	if (eth_is_on_demand_init() || protocol != NETCONS) {
		eth_halt();
		eth_set_current();
		ret = eth_init();
		if (ret < 0) {
			eth_halt();
			return ret;
		}
	} else {
		eth_init_state_only();
	}
restart:
#ifdef CONFIG_USB_KEYBOARD
	net_busy_flag = 0;
#endif
	net_set_state(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.
	 */
	debug_cond(DEBUG_INT_STATE, "--- net_loop Init\n");
	net_init_loop();

	switch (net_check_prereq(protocol)) {
	case 1:
		/* network not configured */
		eth_halt();
		net_set_state(prev_net_state);
		return -ENODEV;

	case 2:
		/* network device not configured */
		break;

	case 0:
		net_dev_exists = 1;
		net_boot_file_size = 0;
		switch (protocol) {
		case TFTPGET:
#ifdef CONFIG_CMD_TFTPPUT
		case TFTPPUT:
#endif
			/* always use ARP to get server ethernet address */
			tftp_start(protocol);
			break;
#ifdef CONFIG_CMD_TFTPSRV
		case TFTPSRV:
			tftp_start_server();
			break;
#endif
#ifdef CONFIG_UDP_FUNCTION_FASTBOOT
		case FASTBOOT:
			fastboot_start_server();
			break;
#endif
#if defined(CONFIG_CMD_DHCP)
		case DHCP:
			bootp_reset();
			net_ip.s_addr = 0;
			dhcp_request();		/* Basically same as BOOTP */
			break;
#endif

		case BOOTP:
			bootp_reset();
			net_ip.s_addr = 0;
			bootp_request();
			break;

#if defined(CONFIG_CMD_RARP)
		case RARP:
			rarp_try = 0;
			net_ip.s_addr = 0;
			rarp_request();
			break;
#endif
#if defined(CONFIG_CMD_PING)
		case PING:
			ping_start();
			break;
#endif
#if defined(CONFIG_CMD_NFS)
		case NFS:
			nfs_start();
			break;
#endif
#if defined(CONFIG_CMD_CDP)
		case CDP:
			cdp_start();
			break;
#endif
#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
		case NETCONS:
			nc_start();
			break;
#endif
#if defined(CONFIG_CMD_SNTP)
		case SNTP:
			sntp_start();
			break;
#endif
#if defined(CONFIG_CMD_DNS)
		case DNS:
			dns_start();
			break;
#endif
#if defined(CONFIG_CMD_LINK_LOCAL)
		case LINKLOCAL:
			link_local_start();
			break;
#endif
#if defined(CONFIG_CMD_WOL)
		case WOL:
			wol_start();
			break;
#endif
		default:
			break;
		}

		break;
	}

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
	defined(CONFIG_LED_STATUS)			&& \
	defined(CONFIG_LED_STATUS_RED)
	/*
	 * Echo the inverted link state to the fault LED.
	 */
	if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
		status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF);
	else
		status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_ON);
#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */
#ifdef CONFIG_USB_KEYBOARD
	net_busy_flag = 1;
#endif

	/*
	 *	Main packet reception loop.  Loop receiving packets until
	 *	someone sets `net_state' to a state that terminates.
	 */
	for (;;) {
		WATCHDOG_RESET();
#ifdef CONFIG_SHOW_ACTIVITY
		show_activity(1);
#endif
		if (arp_timeout_check() > 0)
			time_start = get_timer(0);

		/*
		 *	Check the ethernet for a new packet.  The ethernet
		 *	receive routine will process it.
		 *	Most drivers return the most recent packet size, but not
		 *	errors that may have happened.
		 */
		eth_rx();

		/*
		 *	Abort if ctrl-c was pressed.
		 */
		if (ctrlc()) {
			/* cancel any ARP that may not have completed */
			net_arp_wait_packet_ip.s_addr = 0;

			net_cleanup_loop();
			eth_halt();
			/* Invalidate the last protocol */
			eth_set_last_protocol(BOOTP);

			puts("\nAbort\n");
			/* include a debug print as well incase the debug
			   messages are directed to stderr */
			debug_cond(DEBUG_INT_STATE, "--- net_loop Abort!\n");
			ret = -EINTR;
			goto done;
		}

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

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
	defined(CONFIG_LED_STATUS)			&& \
	defined(CONFIG_LED_STATUS_RED)
			/*
			 * Echo the inverted link state to the fault LED.
			 */
			if (miiphy_link(eth_get_dev()->name,
					CONFIG_SYS_FAULT_MII_ADDR))
				status_led_set(CONFIG_LED_STATUS_RED,
					       CONFIG_LED_STATUS_OFF);
			else
				status_led_set(CONFIG_LED_STATUS_RED,
					       CONFIG_LED_STATUS_ON);
#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */
			debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n");
			x = time_handler;
			time_handler = (thand_f *)0;
			(*x)();
		}

		if (net_state == NETLOOP_FAIL)
			ret = net_start_again();

		switch (net_state) {
		case NETLOOP_RESTART:
			net_restarted = 1;
			goto restart;

		case NETLOOP_SUCCESS:
			net_cleanup_loop();
			if (net_boot_file_size > 0) {
				printf("Bytes transferred = %d (%x hex)\n",
				       net_boot_file_size, net_boot_file_size);
				env_set_hex("filesize", net_boot_file_size);
				env_set_hex("fileaddr", load_addr);
			}
			if (protocol != NETCONS)
				eth_halt();
			else
				eth_halt_state_only();

			eth_set_last_protocol(protocol);

			ret = net_boot_file_size;
			debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n");
			goto done;

		case NETLOOP_FAIL:
			net_cleanup_loop();
			/* Invalidate the last protocol */
			eth_set_last_protocol(BOOTP);
			debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n");
			goto done;

		case NETLOOP_CONTINUE:
			continue;
		}
	}

done:
#ifdef CONFIG_USB_KEYBOARD
	net_busy_flag = 0;
#endif
#ifdef CONFIG_CMD_TFTPPUT
	/* Clear out the handlers */
	net_set_udp_handler(NULL);
	net_set_icmp_handler(NULL);
#endif
	net_set_state(prev_net_state);
	return ret;
}

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

static void start_again_timeout_handler(void)
{
	net_set_state(NETLOOP_RESTART);
}

int net_start_again(void)
{
	char *nretry;
	int retry_forever = 0;
	unsigned long retrycnt = 0;
	int ret;

	nretry = env_get("netretry");
	if (nretry) {
		if (!strcmp(nretry, "yes"))
			retry_forever = 1;
		else if (!strcmp(nretry, "no"))
			retrycnt = 0;
		else if (!strcmp(nretry, "once"))
			retrycnt = 1;
		else
			retrycnt = simple_strtoul(nretry, NULL, 0);
	} else {
		retrycnt = 0;
		retry_forever = 0;
	}

	if ((!retry_forever) && (net_try_count > retrycnt)) {
		eth_halt();
		net_set_state(NETLOOP_FAIL);
		/*
		 * We don't provide a way for the protocol to return an error,
		 * but this is almost always the reason.
		 */
		return -ETIMEDOUT;
	}

	net_try_count++;

	eth_halt();
#if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
	eth_try_another(!net_restarted);
#endif
	ret = eth_init();
	if (net_restart_wrap) {
		net_restart_wrap = 0;
		if (net_dev_exists) {
			net_set_timeout_handler(10000UL,
						start_again_timeout_handler);
			net_set_udp_handler(NULL);
		} else {
			net_set_state(NETLOOP_FAIL);
		}
	} else {
		net_set_state(NETLOOP_RESTART);
	}
	return ret;
}

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

static void dummy_handler(uchar *pkt, unsigned dport,
			struct in_addr sip, unsigned sport,
			unsigned len)
{
}

rxhand_f *net_get_udp_handler(void)
{
	return udp_packet_handler;
}

void net_set_udp_handler(rxhand_f *f)
{
	debug_cond(DEBUG_INT_STATE, "--- net_loop UDP handler set (%p)\n", f);
	if (f == NULL)
		udp_packet_handler = dummy_handler;
	else
		udp_packet_handler = f;
}

rxhand_f *net_get_arp_handler(void)
{
	return arp_packet_handler;
}

void net_set_arp_handler(rxhand_f *f)
{
	debug_cond(DEBUG_INT_STATE, "--- net_loop ARP handler set (%p)\n", f);
	if (f == NULL)
		arp_packet_handler = dummy_handler;
	else
		arp_packet_handler = f;
}

#ifdef CONFIG_CMD_TFTPPUT
void net_set_icmp_handler(rxhand_icmp_f *f)
{
	packet_icmp_handler = f;
}
#endif

void net_set_timeout_handler(ulong iv, thand_f *f)
{
	if (iv == 0) {
		debug_cond(DEBUG_INT_STATE,
			   "--- net_loop timeout handler cancelled\n");
		time_handler = (thand_f *)0;
	} else {
		debug_cond(DEBUG_INT_STATE,
			   "--- net_loop timeout handler set (%p)\n", f);
		time_handler = f;
		time_start = get_timer(0);
		time_delta = iv * CONFIG_SYS_HZ / 1000;
	}
}

int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
		int payload_len)
{
	uchar *pkt;
	int eth_hdr_size;
	int pkt_hdr_size;

	/* make sure the net_tx_packet is initialized (net_init() was called) */
	assert(net_tx_packet != NULL);
	if (net_tx_packet == NULL)
		return -1;

	/* convert to new style broadcast */
	if (dest.s_addr == 0)
		dest.s_addr = 0xFFFFFFFF;

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

	pkt = (uchar *)net_tx_packet;

	eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
	pkt += eth_hdr_size;
	net_set_udp_header(pkt, dest, dport, sport, payload_len);
	pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;

	/* if MAC address was not discovered yet, do an ARP request */
	if (memcmp(ether, net_null_ethaddr, 6) == 0) {
		debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);

		/* save the ip and eth addr for the packet to send after arp */
		net_arp_wait_packet_ip = dest;
		arp_wait_packet_ethaddr = ether;

		/* size of the waiting packet */
		arp_wait_tx_packet_size = pkt_hdr_size + payload_len;

		/* and do the ARP request */
		arp_wait_try = 1;
		arp_wait_timer_start = get_timer(0);
		arp_request();
		return 1;	/* waiting */
	} else {
		debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
			   &dest, ether);
		net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
		return 0;	/* transmitted */
	}
}

#ifdef CONFIG_IP_DEFRAG
/*
 * This function collects fragments in a single packet, according
 * to the algorithm in RFC815. It returns NULL or the pointer to
 * a complete packet, in static storage
 */
#ifndef CONFIG_NET_MAXDEFRAG
#define CONFIG_NET_MAXDEFRAG 16384
#endif
#define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG)

#define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)

/*
 * this is the packet being assembled, either data or frag control.
 * Fragments go by 8 bytes, so this union must be 8 bytes long
 */
struct hole {
	/* first_byte is address of this structure */
	u16 last_byte;	/* last byte in this hole + 1 (begin of next hole) */
	u16 next_hole;	/* index of next (in 8-b blocks), 0 == none */
	u16 prev_hole;	/* index of prev, 0 == none */
	u16 unused;
};

static struct ip_udp_hdr *__net_defragment(struct ip_udp_hdr *ip, int *lenp)
{
	static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
	static u16 first_hole, total_len;
	struct hole *payload, *thisfrag, *h, *newh;
	struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
	uchar *indata = (uchar *)ip;
	int offset8, start, len, done = 0;
	u16 ip_off = ntohs(ip->ip_off);

	/* payload starts after IP header, this fragment is in there */
	payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
	offset8 =  (ip_off & IP_OFFS);
	thisfrag = payload + offset8;
	start = offset8 * 8;
	len = ntohs(ip->ip_len) - IP_HDR_SIZE;

	if (start + len > IP_MAXUDP) /* fragment extends too far */
		return NULL;

	if (!total_len || localip->ip_id != ip->ip_id) {
		/* new (or different) packet, reset structs */
		total_len = 0xffff;
		payload[0].last_byte = ~0;
		payload[0].next_hole = 0;
		payload[0].prev_hole = 0;
		first_hole = 0;
		/* any IP header will work, copy the first we received */
		memcpy(localip, ip, IP_HDR_SIZE);
	}

	/*
	 * What follows is the reassembly algorithm. We use the payload
	 * array as a linked list of hole descriptors, as each hole starts
	 * at a multiple of 8 bytes. However, last byte can be whatever value,
	 * so it is represented as byte count, not as 8-byte blocks.
	 */

	h = payload + first_hole;
	while (h->last_byte < start) {
		if (!h->next_hole) {
			/* no hole that far away */
			return NULL;
		}
		h = payload + h->next_hole;
	}

	/* last fragment may be 1..7 bytes, the "+7" forces acceptance */
	if (offset8 + ((len + 7) / 8) <= h - payload) {
		/* no overlap with holes (dup fragment?) */
		return NULL;
	}

	if (!(ip_off & IP_FLAGS_MFRAG)) {
		/* no more fragmentss: truncate this (last) hole */
		total_len = start + len;
		h->last_byte = start + len;
	}

	/*
	 * There is some overlap: fix the hole list. This code doesn't
	 * deal with a fragment that overlaps with two different holes
	 * (thus being a superset of a previously-received fragment).
	 */

	if ((h >= thisfrag) && (h->last_byte <= start + len)) {
		/* complete overlap with hole: remove hole */
		if (!h->prev_hole && !h->next_hole) {
			/* last remaining hole */
			done = 1;
		} else if (!h->prev_hole) {
			/* first hole */
			first_hole = h->next_hole;
			payload[h->next_hole].prev_hole = 0;
		} else if (!h->next_hole) {
			/* last hole */
			payload[h->prev_hole].next_hole = 0;
		} else {
			/* in the middle of the list */
			payload[h->next_hole].prev_hole = h->prev_hole;
			payload[h->prev_hole].next_hole = h->next_hole;
		}

	} else if (h->last_byte <= start + len) {
		/* overlaps with final part of the hole: shorten this hole */
		h->last_byte = start;

	} else if (h >= thisfrag) {
		/* overlaps with initial part of the hole: move this hole */
		newh = thisfrag + (len / 8);
		*newh = *h;
		h = newh;
		if (h->next_hole)
			payload[h->next_hole].prev_hole = (h - payload);
		if (h->prev_hole)
			payload[h->prev_hole].next_hole = (h - payload);
		else
			first_hole = (h - payload);

	} else {
		/* fragment sits in the middle: split the hole */
		newh = thisfrag + (len / 8);
		*newh = *h;
		h->last_byte = start;
		h->next_hole = (newh - payload);
		newh->prev_hole = (h - payload);
		if (newh->next_hole)
			payload[newh->next_hole].prev_hole = (newh - payload);
	}

	/* finally copy this fragment and possibly return whole packet */
	memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
	if (!done)
		return NULL;

	localip->ip_len = htons(total_len);
	*lenp = total_len + IP_HDR_SIZE;
	return localip;
}

static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
	int *lenp)
{
	u16 ip_off = ntohs(ip->ip_off);
	if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
		return ip; /* not a fragment */
	return __net_defragment(ip, lenp);
}

#else /* !CONFIG_IP_DEFRAG */

static inline struct ip_udp_hdr *net_defragment(struct ip_udp_hdr *ip,
	int *lenp)
{
	u16 ip_off = ntohs(ip->ip_off);
	if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
		return ip; /* not a fragment */
	return NULL;
}
#endif

/**
 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
 * drop others.
 *
 * @parma ip	IP packet containing the ICMP
 */
static void receive_icmp(struct ip_udp_hdr *ip, int len,
			struct in_addr src_ip, struct ethernet_hdr *et)
{
	struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;

	switch (icmph->type) {
	case ICMP_REDIRECT:
		if (icmph->code != ICMP_REDIR_HOST)
			return;
		printf(" ICMP Host Redirect to %pI4 ",
		       &icmph->un.gateway);
		break;
	default:
#if defined(CONFIG_CMD_PING)
		ping_receive(et, ip, len);
#endif
#ifdef CONFIG_CMD_TFTPPUT
		if (packet_icmp_handler)
			packet_icmp_handler(icmph->type, icmph->code,
					    ntohs(ip->udp_dst), src_ip,
					    ntohs(ip->udp_src), icmph->un.data,
					    ntohs(ip->udp_len));
#endif
		break;
	}
}

void net_process_received_packet(uchar *in_packet, int len)
{
	struct ethernet_hdr *et;
	struct ip_udp_hdr *ip;
	struct in_addr dst_ip;
	struct in_addr src_ip;
	int eth_proto;
#if defined(CONFIG_CMD_CDP)
	int iscdp;
#endif
	ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;

	debug_cond(DEBUG_NET_PKT, "packet received\n");

	net_rx_packet = in_packet;
	net_rx_packet_len = len;
	et = (struct ethernet_hdr *)in_packet;

	/* too small packet? */
	if (len < ETHER_HDR_SIZE)
		return;

#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
	if (push_packet) {
		(*push_packet)(in_packet, len);
		return;
	}
#endif

#if defined(CONFIG_CMD_CDP)
	/* keep track if packet is CDP */
	iscdp = is_cdp_packet(et->et_dest);
#endif

	myvlanid = ntohs(net_our_vlan);
	if (myvlanid == (ushort)-1)
		myvlanid = VLAN_NONE;
	mynvlanid = ntohs(net_native_vlan);
	if (mynvlanid == (ushort)-1)
		mynvlanid = VLAN_NONE;

	eth_proto = ntohs(et->et_protlen);

	if (eth_proto < 1514) {
		struct e802_hdr *et802 = (struct e802_hdr *)et;
		/*
		 *	Got a 802.2 packet.  Check the other protocol field.
		 *	XXX VLAN over 802.2+SNAP not implemented!
		 */
		eth_proto = ntohs(et802->et_prot);

		ip = (struct ip_udp_hdr *)(in_packet + E802_HDR_SIZE);
		len -= E802_HDR_SIZE;

	} else if (eth_proto != PROT_VLAN) {	/* normal packet */
		ip = (struct ip_udp_hdr *)(in_packet + ETHER_HDR_SIZE);
		len -= ETHER_HDR_SIZE;

	} else {			/* VLAN packet */
		struct vlan_ethernet_hdr *vet =
			(struct vlan_ethernet_hdr *)et;

		debug_cond(DEBUG_NET_PKT, "VLAN packet received\n");

		/* too small packet? */
		if (len < VLAN_ETHER_HDR_SIZE)
			return;

		/* if no VLAN active */
		if ((ntohs(net_our_vlan) & VLAN_IDMASK) == VLAN_NONE
#if defined(CONFIG_CMD_CDP)
				&& iscdp == 0
#endif
				)
			return;

		cti = ntohs(vet->vet_tag);
		vlanid = cti & VLAN_IDMASK;
		eth_proto = ntohs(vet->vet_type);

		ip = (struct ip_udp_hdr *)(in_packet + VLAN_ETHER_HDR_SIZE);
		len -= VLAN_ETHER_HDR_SIZE;
	}

	debug_cond(DEBUG_NET_PKT, "Receive from protocol 0x%x\n", eth_proto);

#if defined(CONFIG_CMD_CDP)
	if (iscdp) {
		cdp_receive((uchar *)ip, len);
		return;
	}
#endif

	if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
		if (vlanid == VLAN_NONE)
			vlanid = (mynvlanid & VLAN_IDMASK);
		/* not matched? */
		if (vlanid != (myvlanid & VLAN_IDMASK))
			return;
	}

	switch (eth_proto) {
	case PROT_ARP:
		arp_receive(et, ip, len);
		break;

#ifdef CONFIG_CMD_RARP
	case PROT_RARP:
		rarp_receive(ip, len);
		break;
#endif
	case PROT_IP:
		debug_cond(DEBUG_NET_PKT, "Got IP\n");
		/* Before we start poking the header, make sure it is there */
		if (len < IP_UDP_HDR_SIZE) {
			debug("len bad %d < %lu\n", len,
			      (ulong)IP_UDP_HDR_SIZE);
			return;
		}
		/* Check the packet length */
		if (len < ntohs(ip->ip_len)) {
			debug("len bad %d < %d\n", len, ntohs(ip->ip_len));
			return;
		}
		len = ntohs(ip->ip_len);
		debug_cond(DEBUG_NET_PKT, "len=%d, v=%02x\n",
			   len, ip->ip_hl_v & 0xff);

		/* Can't deal with anything except IPv4 */
		if ((ip->ip_hl_v & 0xf0) != 0x40)
			return;
		/* Can't deal with IP options (headers != 20 bytes) */
		if ((ip->ip_hl_v & 0x0f) > 0x05)
			return;
		/* Check the Checksum of the header */
		if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
			debug("checksum bad\n");
			return;
		}
		/* If it is not for us, ignore it */
		dst_ip = net_read_ip(&ip->ip_dst);
		if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr &&
		    dst_ip.s_addr != 0xFFFFFFFF) {
#ifdef CONFIG_MCAST_TFTP
			if (net_mcast_addr != dst_ip)
#endif
				return;
		}
		/* Read source IP address for later use */
		src_ip = net_read_ip(&ip->ip_src);
		/*
		 * The function returns the unchanged packet if it's not
		 * a fragment, and either the complete packet or NULL if
		 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
		 */
		ip = net_defragment(ip, &len);
		if (!ip)
			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.
		 *
		 * Simon Glass <sjg@chromium.org>: We get an ICMP when
		 * we send a tftp packet to a dead connection, or when
		 * there is no server at the other end.
		 */
		if (ip->ip_p == IPPROTO_ICMP) {
			receive_icmp(ip, len, src_ip, et);
			return;
		} else if (ip->ip_p != IPPROTO_UDP) {	/* Only UDP packets */
			return;
		}

		debug_cond(DEBUG_DEV_PKT,
			   "received UDP (to=%pI4, from=%pI4, len=%d)\n",
			   &dst_ip, &src_ip, len);

#ifdef CONFIG_UDP_CHECKSUM
		if (ip->udp_xsum != 0) {
			ulong   xsum;
			ushort *sumptr;
			ushort  sumlen;

			xsum  = ip->ip_p;
			xsum += (ntohs(ip->udp_len));
			xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff;
			xsum += (ntohl(ip->ip_src.s_addr) >>  0) & 0x0000ffff;
			xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff;
			xsum += (ntohl(ip->ip_dst.s_addr) >>  0) & 0x0000ffff;

			sumlen = ntohs(ip->udp_len);
			sumptr = (ushort *)&(ip->udp_src);

			while (sumlen > 1) {
				ushort sumdata;

				sumdata = *sumptr++;
				xsum += ntohs(sumdata);
				sumlen -= 2;
			}
			if (sumlen > 0) {
				ushort sumdata;

				sumdata = *(unsigned char *)sumptr;
				sumdata = (sumdata << 8) & 0xff00;
				xsum += sumdata;
			}
			while ((xsum >> 16) != 0) {
				xsum = (xsum & 0x0000ffff) +
				       ((xsum >> 16) & 0x0000ffff);
			}
			if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
				printf(" UDP wrong checksum %08lx %08x\n",
				       xsum, ntohs(ip->udp_xsum));
				return;
			}
		}
#endif

#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD)
		nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
				src_ip,
				ntohs(ip->udp_dst),
				ntohs(ip->udp_src),
				ntohs(ip->udp_len) - UDP_HDR_SIZE);
#endif
		/*
		 * IP header OK.  Pass the packet to the current handler.
		 */
		(*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
				      ntohs(ip->udp_dst),
				      src_ip,
				      ntohs(ip->udp_src),
				      ntohs(ip->udp_len) - UDP_HDR_SIZE);
		break;
#ifdef CONFIG_CMD_WOL
	case PROT_WOL:
		wol_receive(ip, len);
		break;
#endif
	}
}

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

static int net_check_prereq(enum proto_t protocol)
{
	switch (protocol) {
		/* Fall through */
#if defined(CONFIG_CMD_PING)
	case PING:
		if (net_ping_ip.s_addr == 0) {
			puts("*** ERROR: ping address not given\n");
			return 1;
		}
		goto common;
#endif
#if defined(CONFIG_CMD_SNTP)
	case SNTP:
		if (net_ntp_server.s_addr == 0) {
			puts("*** ERROR: NTP server address not given\n");
			return 1;
		}
		goto common;
#endif
#if defined(CONFIG_CMD_DNS)
	case DNS:
		if (net_dns_server.s_addr == 0) {
			puts("*** ERROR: DNS server address not given\n");
			return 1;
		}
		goto common;
#endif
#if defined(CONFIG_CMD_NFS)
	case NFS:
#endif
		/* Fall through */
	case TFTPGET:
	case TFTPPUT:
		if (net_server_ip.s_addr == 0) {
			puts("*** ERROR: `serverip' not set\n");
			return 1;
		}
#if	defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
	defined(CONFIG_CMD_DNS)
common:
#endif
		/* Fall through */

	case NETCONS:
	case FASTBOOT:
	case TFTPSRV:
		if (net_ip.s_addr == 0) {
			puts("*** ERROR: `ipaddr' not set\n");
			return 1;
		}
		/* Fall through */

#ifdef CONFIG_CMD_RARP
	case RARP:
#endif
	case BOOTP:
	case CDP:
	case DHCP:
	case LINKLOCAL:
		if (memcmp(net_ethaddr, "\0\0\0\0\0\0", 6) == 0) {
			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;
			}

			net_start_again();
			return 2;
		}
		/* Fall through */
	default:
		return 0;
	}
	return 0;		/* OK */
}
/**********************************************************************/

int
net_eth_hdr_size(void)
{
	ushort myvlanid;

	myvlanid = ntohs(net_our_vlan);
	if (myvlanid == (ushort)-1)
		myvlanid = VLAN_NONE;

	return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
		VLAN_ETHER_HDR_SIZE;
}

int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot)
{
	struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
	ushort myvlanid;

	myvlanid = ntohs(net_our_vlan);
	if (myvlanid == (ushort)-1)
		myvlanid = VLAN_NONE;

	memcpy(et->et_dest, dest_ethaddr, 6);
	memcpy(et->et_src, net_ethaddr, 6);
	if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
		et->et_protlen = htons(prot);
		return ETHER_HDR_SIZE;
	} else {
		struct vlan_ethernet_hdr *vet =
			(struct vlan_ethernet_hdr *)xet;

		vet->vet_vlan_type = htons(PROT_VLAN);
		vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
		vet->vet_type = htons(prot);
		return VLAN_ETHER_HDR_SIZE;
	}
}

int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
{
	ushort protlen;

	memcpy(et->et_dest, addr, 6);
	memcpy(et->et_src, net_ethaddr, 6);
	protlen = ntohs(et->et_protlen);
	if (protlen == PROT_VLAN) {
		struct vlan_ethernet_hdr *vet =
			(struct vlan_ethernet_hdr *)et;
		vet->vet_type = htons(prot);
		return VLAN_ETHER_HDR_SIZE;
	} else if (protlen > 1514) {
		et->et_protlen = htons(prot);
		return ETHER_HDR_SIZE;
	} else {
		/* 802.2 + SNAP */
		struct e802_hdr *et802 = (struct e802_hdr *)et;
		et802->et_prot = htons(prot);
		return E802_HDR_SIZE;
	}
}

void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
{
	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;

	/*
	 *	Construct an IP header.
	 */
	/* IP_HDR_SIZE / 4 (not including UDP) */
	ip->ip_hl_v  = 0x45;
	ip->ip_tos   = 0;
	ip->ip_len   = htons(IP_HDR_SIZE);
	ip->ip_id    = htons(net_ip_id++);
	ip->ip_off   = htons(IP_FLAGS_DFRAG);	/* Don't fragment */
	ip->ip_ttl   = 255;
	ip->ip_sum   = 0;
	/* already in network byte order */
	net_copy_ip((void *)&ip->ip_src, &source);
	/* already in network byte order */
	net_copy_ip((void *)&ip->ip_dst, &dest);
}

void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
			int len)
{
	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;

	/*
	 *	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)
		pkt[IP_UDP_HDR_SIZE + len] = 0;

	net_set_ip_header(pkt, dest, net_ip);
	ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
	ip->ip_p     = IPPROTO_UDP;
	ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);

	ip->udp_src  = htons(sport);
	ip->udp_dst  = htons(dport);
	ip->udp_len  = htons(UDP_HDR_SIZE + len);
	ip->udp_xsum = 0;
}

void copy_filename(char *dst, const char *src, int size)
{
	if (*src && (*src == '"')) {
		++src;
		--size;
	}

	while ((--size > 0) && *src && (*src != '"'))
		*dst++ = *src++;
	*dst = '\0';
}

#if	defined(CONFIG_CMD_NFS)		|| \
	defined(CONFIG_CMD_SNTP)	|| \
	defined(CONFIG_CMD_DNS)
/*
 * make port a little random (1024-17407)
 * This keeps the math somewhat trivial to compute, and seems to work with
 * all supported protocols/clients/servers
 */
unsigned int random_port(void)
{
	return 1024 + (get_timer(0) % 0x4000);
}
#endif

void ip_to_string(struct in_addr x, char *s)
{
	x.s_addr = ntohl(x.s_addr);
	sprintf(s, "%d.%d.%d.%d",
		(int) ((x.s_addr >> 24) & 0xff),
		(int) ((x.s_addr >> 16) & 0xff),
		(int) ((x.s_addr >> 8) & 0xff),
		(int) ((x.s_addr >> 0) & 0xff)
	);
}

void vlan_to_string(ushort x, char *s)
{
	x = ntohs(x);

	if (x == (ushort)-1)
		x = VLAN_NONE;

	if (x == VLAN_NONE)
		strcpy(s, "none");
	else
		sprintf(s, "%d", x & VLAN_IDMASK);
}

ushort string_to_vlan(const char *s)
{
	ushort id;

	if (s == NULL)
		return htons(VLAN_NONE);

	if (*s < '0' || *s > '9')
		id = VLAN_NONE;
	else
		id = (ushort)simple_strtoul(s, NULL, 10);

	return htons(id);
}

ushort env_get_vlan(char *var)
{
	return string_to_vlan(env_get(var));
}