summaryrefslogtreecommitdiff
path: root/net/net.c
blob: c5acf8ff6e1cbf2612378a1ccdad03a0d31907a3 (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
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
/*
 *	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
 *
 * 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
 */


#include <common.h>
#include <watchdog.h>
#include <command.h>
#include <net.h>
#include "bootp.h"
#include "tftp.h"
#ifdef CONFIG_CMD_RARP
#include "rarp.h"
#endif
#include "nfs.h"
#ifdef CONFIG_STATUS_LED
#include <status_led.h>
#include <miiphy.h>
#endif
#if defined(CONFIG_CMD_SNTP)
#include "sntp.h"
#endif
#if defined(CONFIG_CDP_VERSION)
#include <timestamp.h>
#endif
#if defined(CONFIG_CMD_DNS)
#include "dns.h"
#endif

DECLARE_GLOBAL_DATA_PTR;

#ifndef	CONFIG_ARP_TIMEOUT
/* Milliseconds before trying ARP again */
# define ARP_TIMEOUT		5000UL
#else
# define ARP_TIMEOUT		CONFIG_ARP_TIMEOUT
#endif


#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

/** BOOTP EXTENTIONS **/

/* Our subnet mask (0=unknown) */
IPaddr_t	NetOurSubnetMask;
/* Our gateways IP address */
IPaddr_t	NetOurGatewayIP;
/* Our DNS IP address */
IPaddr_t	NetOurDNSIP;
#if defined(CONFIG_BOOTP_DNS2)
/* Our 2nd DNS IP address */
IPaddr_t	NetOurDNS2IP;
#endif
/* Our NIS domain */
char		NetOurNISDomain[32] = {0,};
/* Our hostname */
char		NetOurHostName[32] = {0,};
/* Our bootpath */
char		NetOurRootPath[64] = {0,};
/* Our bootfile size in blocks */
ushort		NetBootFileSize;

#ifdef CONFIG_MCAST_TFTP	/* Multicast TFTP */
IPaddr_t Mcast_addr;
#endif

/** END OF BOOTP EXTENTIONS **/

/* The actual transferred size of the bootfile (in bytes) */
ulong		NetBootFileXferSize;
/* Our ethernet address */
uchar		NetOurEther[6];
/* Boot server enet address */
uchar		NetServerEther[6];
/* Our IP addr (0 = unknown) */
IPaddr_t	NetOurIP;
/* Server IP addr (0 = unknown) */
IPaddr_t	NetServerIP;
/* Current receive packet */
volatile uchar *NetRxPacket;
/* Current rx packet length */
int		NetRxPacketLen;
/* IP packet ID */
unsigned	NetIPID;
/* Ethernet bcast address */
uchar		NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
uchar		NetEtherNullAddr[6];
#ifdef CONFIG_API
void		(*push_packet)(volatile void *, int len) = 0;
#endif
#if defined(CONFIG_CMD_CDP)
/* Ethernet bcast address */
uchar		NetCDPAddr[6] = { 0x01, 0x00, 0x0c, 0xcc, 0xcc, 0xcc };
#endif
/* Network loop state */
int		NetState;
/* Tried all network devices */
int		NetRestartWrap;
/* Network loop restarted */
static int	NetRestarted;
/* At least one device configured */
static int	NetDevExists;

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

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

#if defined(CONFIG_CMD_PING)
/* the ip address to ping */
IPaddr_t	NetPingIP;

static void PingStart(void);
#endif

#if defined(CONFIG_CMD_CDP)
static void CDPStart(void);
#endif

#if defined(CONFIG_CMD_SNTP)
/* NTP server IP address */
IPaddr_t	NetNtpServerIP;
/* offset time from UTC */
int		NetTimeOffset;
#endif

#ifdef CONFIG_NETCONSOLE
void NcStart(void);
int nc_input_packet(uchar *pkt, unsigned dest, unsigned src, unsigned len);
#endif

volatile uchar	PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];

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

/* Current RX packet handler */
static rxhand_f *packetHandler;
#ifdef CONFIG_CMD_TFTPPUT
static rxhand_icmp_f *packet_icmp_handler;	/* Current ICMP rx handler */
#endif
/* Current timeout handler */
static thand_f *timeHandler;
/* Time base value */
static ulong	timeStart;
/* Current timeout value */
static ulong	timeDelta;
/* THE transmit packet */
volatile uchar *NetTxPacket;

static int net_check_prereq(enum proto_t protocol);

static int NetTryCount;

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

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

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

	debug("ARP broadcast %d\n", NetArpWaitTry);

	pkt = NetTxPacket;

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

	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);

	/* source ET addr */
	memcpy(&arp->ar_data[0], NetOurEther, 6);
	/* source IP addr */
	NetWriteIP((uchar *) &arp->ar_data[6], NetOurIP);
	/* dest ET addr = 0 */
	memset(&arp->ar_data[10], '\0', 6);
	if ((NetArpWaitPacketIP & NetOurSubnetMask) !=
	    (NetOurIP & NetOurSubnetMask)) {
		if (NetOurGatewayIP == 0) {
			puts("## Warning: gatewayip needed but not set\n");
			NetArpWaitReplyIP = NetArpWaitPacketIP;
		} else {
			NetArpWaitReplyIP = NetOurGatewayIP;
		}
	} else {
		NetArpWaitReplyIP = NetArpWaitPacketIP;
	}

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

void ArpTimeoutCheck(void)
{
	ulong t;

	if (!NetArpWaitPacketIP)
		return;

	t = get_timer(0);

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

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

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

	if (s != NULL) {
		if (*s == 'n') {
			/*
			 * Just use BOOTP/RARP to configure system;
			 * Do not use TFTP to load the bootfile.
			 */
			NetState = NETLOOP_SUCCESS;
			return;
		}
#if defined(CONFIG_CMD_NFS)
		if (strcmp(s, "NFS") == 0) {
			/*
			 * Use NFS to load the bootfile.
			 */
			NfsStart();
			return;
		}
#endif
	}
	TftpStart(TFTPGET);
}

static void NetInitLoop(enum proto_t protocol)
{
	static int env_changed_id;
	bd_t *bd = gd->bd;
	int env_id = get_env_id();

	/* update only when the environment has changed */
	if (env_changed_id != env_id) {
		NetOurIP = getenv_IPaddr("ipaddr");
		NetCopyIP(&bd->bi_ip_addr, &NetOurIP);
		NetOurGatewayIP = getenv_IPaddr("gatewayip");
		NetOurSubnetMask = getenv_IPaddr("netmask");
		NetServerIP = getenv_IPaddr("serverip");
		NetOurNativeVLAN = getenv_VLAN("nvlan");
		NetOurVLAN = getenv_VLAN("vlan");
#if defined(CONFIG_CMD_DNS)
		NetOurDNSIP = getenv_IPaddr("dnsip");
#endif
		env_changed_id = env_id;
	}

	return;
}

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

int NetLoop(enum proto_t protocol)
{
	bd_t *bd = gd->bd;
	int ret = -1;

	NetRestarted = 0;
	NetDevExists = 0;

	/* XXX problem with bss workaround */
	NetArpWaitPacketMAC = NULL;
	NetArpWaitTxPacket = NULL;
	NetArpWaitPacketIP = 0;
	NetArpWaitReplyIP = 0;
	NetArpWaitTxPacket = NULL;
	NetTxPacket = NULL;
	NetTryCount = 1;

	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;
	}

	if (!NetArpWaitTxPacket) {
		NetArpWaitTxPacket = &NetArpWaitPacketBuf[0] + (PKTALIGN - 1);
		NetArpWaitTxPacket -= (ulong)NetArpWaitTxPacket % PKTALIGN;
		NetArpWaitTxPacketSize = 0;
	}

	bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
	eth_halt();
	eth_set_current();
	if (eth_init(bd) < 0) {
		eth_halt();
		return -1;
	}

restart:
	memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);

	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.
	 */
	NetInitLoop(protocol);

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

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

	case 0:
		NetDevExists = 1;
		NetBootFileXferSize = 0;
		switch (protocol) {
		case TFTPGET:
#ifdef CONFIG_CMD_TFTPPUT
		case TFTPPUT:
#endif
			/* always use ARP to get server ethernet address */
			TftpStart(protocol);
			break;
#ifdef CONFIG_CMD_TFTPSRV
		case TFTPSRV:
			TftpStartServer();
			break;
#endif
#if defined(CONFIG_CMD_DHCP)
		case DHCP:
			BootpTry = 0;
			NetOurIP = 0;
			DhcpRequest();		/* Basically same as BOOTP */
			break;
#endif

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

#if defined(CONFIG_CMD_RARP)
		case RARP:
			RarpTry = 0;
			NetOurIP = 0;
			RarpRequest();
			break;
#endif
#if defined(CONFIG_CMD_PING)
		case PING:
			PingStart();
			break;
#endif
#if defined(CONFIG_CMD_NFS)
		case NFS:
			NfsStart();
			break;
#endif
#if defined(CONFIG_CMD_CDP)
		case CDP:
			CDPStart();
			break;
#endif
#ifdef CONFIG_NETCONSOLE
		case NETCONS:
			NcStart();
			break;
#endif
#if defined(CONFIG_CMD_SNTP)
		case SNTP:
			SntpStart();
			break;
#endif
#if defined(CONFIG_CMD_DNS)
		case DNS:
			DnsStart();
			break;
#endif
		default:
			break;
		}

		break;
	}

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
	defined(CONFIG_STATUS_LED)			&& \
	defined(STATUS_LED_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(STATUS_LED_RED, STATUS_LED_OFF);
	else
		status_led_set(STATUS_LED_RED, STATUS_LED_ON);
#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */

	/*
	 *	Main packet reception loop.  Loop receiving packets until
	 *	someone sets `NetState' to a state that terminates.
	 */
	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();
			puts("\nAbort\n");
			goto done;
		}

		ArpTimeoutCheck();

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

#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
#if	defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN)	&& \
	defined(CONFIG_STATUS_LED)			&& \
	defined(STATUS_LED_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(STATUS_LED_RED, STATUS_LED_OFF);
			} else {
				status_led_set(STATUS_LED_RED, STATUS_LED_ON);
			}
#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
#endif /* CONFIG_MII, ... */
			x = timeHandler;
			timeHandler = (thand_f *)0;
			(*x)();
		}


		switch (NetState) {

		case NETLOOP_RESTART:
			NetRestarted = 1;
			goto restart;

		case NETLOOP_SUCCESS:
			if (NetBootFileXferSize > 0) {
				char buf[20];
				printf("Bytes transferred = %ld (%lx hex)\n",
					NetBootFileXferSize,
					NetBootFileXferSize);
				sprintf(buf, "%lX", NetBootFileXferSize);
				setenv("filesize", buf);

				sprintf(buf, "%lX", (unsigned long)load_addr);
				setenv("fileaddr", buf);
			}
			eth_halt();
			ret = NetBootFileXferSize;
			goto done;

		case NETLOOP_FAIL:
			goto done;
		}
	}

done:
#ifdef CONFIG_CMD_TFTPPUT
	/* Clear out the handlers */
	NetSetHandler(NULL);
	net_set_icmp_handler(NULL);
#endif
	return ret;
}

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

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

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

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

	nretry = getenv("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
		retry_forever = 1;

	if ((!retry_forever) && (NetTryCount >= retrycnt)) {
		eth_halt();
		NetState = NETLOOP_FAIL;
		return;
	}

	NetTryCount++;

	eth_halt();
#if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
	eth_try_another(!NetRestarted);
#endif
	eth_init(gd->bd);
	if (NetRestartWrap) {
		NetRestartWrap = 0;
		if (NetDevExists) {
			NetSetTimeout(10000UL, startAgainTimeout);
			NetSetHandler(startAgainHandler);
		} else {
			NetState = NETLOOP_FAIL;
		}
	} else {
		NetState = NETLOOP_RESTART;
	}
}

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

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

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

void
NetSetTimeout(ulong iv, thand_f *f)
{
	if (iv == 0) {
		timeHandler = (thand_f *)0;
	} else {
		timeHandler = f;
		timeStart = get_timer(0);
		timeDelta = iv;
	}
}


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

int
NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
{
	uchar *pkt;

	/* 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) {

		debug("sending ARP for %08x\n", dest);

		NetArpWaitPacketIP = dest;
		NetArpWaitPacketMAC = ether;

		pkt = NetArpWaitTxPacket;
		pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP);

		NetSetIP(pkt, dest, dport, sport, len);
		memcpy(pkt + IP_HDR_SIZE, (uchar *)NetTxPacket +
		       (pkt - (uchar *)NetArpWaitTxPacket) + IP_HDR_SIZE, len);

		/* size of the waiting packet */
		NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) +
			IP_HDR_SIZE + len;

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

	debug("sending UDP to %08x/%pM\n", dest, ether);

	pkt = (uchar *)NetTxPacket;
	pkt += NetSetEther(pkt, ether, PROT_IP);
	NetSetIP(pkt, dest, dport, sport, len);
	(void) eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_HDR_SIZE + len);

	return 0;	/* transmitted */
}

#if defined(CONFIG_CMD_PING)
static ushort PingSeqNo;

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

	/* XXX always send arp request */

	memcpy(mac, NetEtherNullAddr, 6);

	debug("sending ARP for %08x\n", NetPingIP);

	NetArpWaitPacketIP = NetPingIP;
	NetArpWaitPacketMAC = mac;

	pkt = NetArpWaitTxPacket;
	pkt += NetSetEther(pkt, mac, PROT_IP);

	ip = (volatile IP_t *)pkt;

	/*
	 * Construct an IP and ICMP header.
	 * (need to set no fragment bit - XXX)
	 */
	/* IP_HDR_SIZE / 4 (not including UDP) */
	ip->ip_hl_v  = 0x45;
	ip->ip_tos   = 0;
	ip->ip_len   = htons(IP_HDR_SIZE_NO_UDP + 8);
	ip->ip_id    = htons(NetIPID++);
	ip->ip_off   = htons(IP_FLAGS_DFRAG);	/* Don't fragment */
	ip->ip_ttl   = 255;
	ip->ip_p     = 0x01;		/* ICMP */
	ip->ip_sum   = 0;
	/* already in network byte order */
	NetCopyIP((void *)&ip->ip_src, &NetOurIP);
	/* - "" - */
	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 =
		(pkt - NetArpWaitTxPacket) + 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 */
}

static void
PingHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
	    unsigned len)
{
	if (sip != NetPingIP)
		return;

	NetState = NETLOOP_SUCCESS;
}

static void PingStart(void)
{
	printf("Using %s device\n", eth_get_name());
	NetSetTimeout(10000UL, PingTimeout);
	NetSetHandler(PingHandler);

	PingSend();
}
#endif

#if defined(CONFIG_CMD_CDP)

#define CDP_DEVICE_ID_TLV		0x0001
#define CDP_ADDRESS_TLV			0x0002
#define CDP_PORT_ID_TLV			0x0003
#define CDP_CAPABILITIES_TLV		0x0004
#define CDP_VERSION_TLV			0x0005
#define CDP_PLATFORM_TLV		0x0006
#define CDP_NATIVE_VLAN_TLV		0x000a
#define CDP_APPLIANCE_VLAN_TLV		0x000e
#define CDP_TRIGGER_TLV			0x000f
#define CDP_POWER_CONSUMPTION_TLV	0x0010
#define CDP_SYSNAME_TLV			0x0014
#define CDP_SYSOBJECT_TLV		0x0015
#define CDP_MANAGEMENT_ADDRESS_TLV	0x0016

#define CDP_TIMEOUT			250UL	/* one packet every 250ms */

static int CDPSeq;
static int CDPOK;

ushort CDPNativeVLAN;
ushort CDPApplianceVLAN;

static const uchar CDP_SNAP_hdr[8] = { 0xAA, 0xAA, 0x03, 0x00, 0x00, 0x0C, 0x20,
				       0x00 };

static ushort CDP_compute_csum(const uchar *buff, ushort len)
{
	ushort csum;
	int     odd;
	ulong   result = 0;
	ushort  leftover;
	ushort *p;

	if (len > 0) {
		odd = 1 & (ulong)buff;
		if (odd) {
			result = *buff << 8;
			len--;
			buff++;
		}
		while (len > 1) {
			p = (ushort *)buff;
			result += *p++;
			buff = (uchar *)p;
			if (result & 0x80000000)
				result = (result & 0xFFFF) + (result >> 16);
			len -= 2;
		}
		if (len) {
			leftover = (signed short)(*(const signed char *)buff);
			/* CISCO SUCKS big time! (and blows too):
			 * CDP uses the IP checksum algorithm with a twist;
			 * for the last byte it *sign* extends and sums.
			 */
			result = (result & 0xffff0000) |
				 ((result + leftover) & 0x0000ffff);
		}
		while (result >> 16)
			result = (result & 0xFFFF) + (result >> 16);

		if (odd)
			result = ((result >> 8) & 0xff) |
				 ((result & 0xff) << 8);
	}

	/* add up 16-bit and 17-bit words for 17+c bits */
	result = (result & 0xffff) + (result >> 16);
	/* add up 16-bit and 2-bit for 16+c bit */
	result = (result & 0xffff) + (result >> 16);
	/* add up carry.. */
	result = (result & 0xffff) + (result >> 16);

	/* negate */
	csum = ~(ushort)result;

	/* run time endian detection */
	if (csum != htons(csum))	/* little endian */
		csum = htons(csum);

	return csum;
}

int CDPSendTrigger(void)
{
	volatile uchar *pkt;
	volatile ushort *s;
	volatile ushort *cp;
	Ethernet_t *et;
	int len;
	ushort chksum;
#if	defined(CONFIG_CDP_DEVICE_ID) || defined(CONFIG_CDP_PORT_ID)   || \
	defined(CONFIG_CDP_VERSION)   || defined(CONFIG_CDP_PLATFORM)
	char buf[32];
#endif

	pkt = NetTxPacket;
	et = (Ethernet_t *)pkt;

	/* NOTE: trigger sent not on any VLAN */

	/* form ethernet header */
	memcpy(et->et_dest, NetCDPAddr, 6);
	memcpy(et->et_src, NetOurEther, 6);

	pkt += ETHER_HDR_SIZE;

	/* SNAP header */
	memcpy((uchar *)pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr));
	pkt += sizeof(CDP_SNAP_hdr);

	/* CDP header */
	*pkt++ = 0x02;				/* CDP version 2 */
	*pkt++ = 180;				/* TTL */
	s = (volatile ushort *)pkt;
	cp = s;
	/* checksum (0 for later calculation) */
	*s++ = htons(0);

	/* CDP fields */
#ifdef CONFIG_CDP_DEVICE_ID
	*s++ = htons(CDP_DEVICE_ID_TLV);
	*s++ = htons(CONFIG_CDP_DEVICE_ID);
	sprintf(buf, CONFIG_CDP_DEVICE_ID_PREFIX "%pm", NetOurEther);
	memcpy((uchar *)s, buf, 16);
	s += 16 / 2;
#endif

#ifdef CONFIG_CDP_PORT_ID
	*s++ = htons(CDP_PORT_ID_TLV);
	memset(buf, 0, sizeof(buf));
	sprintf(buf, CONFIG_CDP_PORT_ID, eth_get_dev_index());
	len = strlen(buf);
	if (len & 1)	/* make it even */
		len++;
	*s++ = htons(len + 4);
	memcpy((uchar *)s, buf, len);
	s += len / 2;
#endif

#ifdef CONFIG_CDP_CAPABILITIES
	*s++ = htons(CDP_CAPABILITIES_TLV);
	*s++ = htons(8);
	*(ulong *)s = htonl(CONFIG_CDP_CAPABILITIES);
	s += 2;
#endif

#ifdef CONFIG_CDP_VERSION
	*s++ = htons(CDP_VERSION_TLV);
	memset(buf, 0, sizeof(buf));
	strcpy(buf, CONFIG_CDP_VERSION);
	len = strlen(buf);
	if (len & 1)	/* make it even */
		len++;
	*s++ = htons(len + 4);
	memcpy((uchar *)s, buf, len);
	s += len / 2;
#endif

#ifdef CONFIG_CDP_PLATFORM
	*s++ = htons(CDP_PLATFORM_TLV);
	memset(buf, 0, sizeof(buf));
	strcpy(buf, CONFIG_CDP_PLATFORM);
	len = strlen(buf);
	if (len & 1)	/* make it even */
		len++;
	*s++ = htons(len + 4);
	memcpy((uchar *)s, buf, len);
	s += len / 2;
#endif

#ifdef CONFIG_CDP_TRIGGER
	*s++ = htons(CDP_TRIGGER_TLV);
	*s++ = htons(8);
	*(ulong *)s = htonl(CONFIG_CDP_TRIGGER);
	s += 2;
#endif

#ifdef CONFIG_CDP_POWER_CONSUMPTION
	*s++ = htons(CDP_POWER_CONSUMPTION_TLV);
	*s++ = htons(6);
	*s++ = htons(CONFIG_CDP_POWER_CONSUMPTION);
#endif

	/* length of ethernet packet */
	len = (uchar *)s - ((uchar *)NetTxPacket + ETHER_HDR_SIZE);
	et->et_protlen = htons(len);

	len = ETHER_HDR_SIZE + sizeof(CDP_SNAP_hdr);
	chksum = CDP_compute_csum((uchar *)NetTxPacket + len,
				  (uchar *)s - (NetTxPacket + len));
	if (chksum == 0)
		chksum = 0xFFFF;
	*cp = htons(chksum);

	(void) eth_send(NetTxPacket, (uchar *)s - NetTxPacket);
	return 0;
}

static void
CDPTimeout(void)
{
	CDPSeq++;

	if (CDPSeq < 3) {
		NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
		CDPSendTrigger();
		return;
	}

	/* if not OK try again */
	if (!CDPOK)
		NetStartAgain();
	else
		NetState = NETLOOP_SUCCESS;
}

static void
CDPDummyHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
		unsigned len)
{
	/* nothing */
}

static void
CDPHandler(const uchar *pkt, unsigned len)
{
	const uchar *t;
	const ushort *ss;
	ushort type, tlen;
	ushort vlan, nvlan;

	/* minimum size? */
	if (len < sizeof(CDP_SNAP_hdr) + 4)
		goto pkt_short;

	/* check for valid CDP SNAP header */
	if (memcmp(pkt, CDP_SNAP_hdr, sizeof(CDP_SNAP_hdr)) != 0)
		return;

	pkt += sizeof(CDP_SNAP_hdr);
	len -= sizeof(CDP_SNAP_hdr);

	/* Version of CDP protocol must be >= 2 and TTL != 0 */
	if (pkt[0] < 0x02 || pkt[1] == 0)
		return;

	/*
	 * if version is greater than 0x02 maybe we'll have a problem;
	 * output a warning
	 */
	if (pkt[0] != 0x02)
		printf("** WARNING: CDP packet received with a protocol version %d > 2\n",
				pkt[0] & 0xff);

	if (CDP_compute_csum(pkt, len) != 0)
		return;

	pkt += 4;
	len -= 4;

	vlan = htons(-1);
	nvlan = htons(-1);
	while (len > 0) {
		if (len < 4)
			goto pkt_short;

		ss = (const ushort *)pkt;
		type = ntohs(ss[0]);
		tlen = ntohs(ss[1]);
		if (tlen > len)
			goto pkt_short;

		pkt += tlen;
		len -= tlen;

		ss += 2;	/* point ss to the data of the TLV */
		tlen -= 4;

		switch (type) {
		case CDP_DEVICE_ID_TLV:
			break;
		case CDP_ADDRESS_TLV:
			break;
		case CDP_PORT_ID_TLV:
			break;
		case CDP_CAPABILITIES_TLV:
			break;
		case CDP_VERSION_TLV:
			break;
		case CDP_PLATFORM_TLV:
			break;
		case CDP_NATIVE_VLAN_TLV:
			nvlan = *ss;
			break;
		case CDP_APPLIANCE_VLAN_TLV:
			t = (const uchar *)ss;
			while (tlen > 0) {
				if (tlen < 3)
					goto pkt_short;

				ss = (const ushort *)(t + 1);

#ifdef CONFIG_CDP_APPLIANCE_VLAN_TYPE
				if (t[0] == CONFIG_CDP_APPLIANCE_VLAN_TYPE)
					vlan = *ss;
#else
				/* XXX will this work; dunno */
				vlan = ntohs(*ss);
#endif
				t += 3; tlen -= 3;
			}
			break;
		case CDP_TRIGGER_TLV:
			break;
		case CDP_POWER_CONSUMPTION_TLV:
			break;
		case CDP_SYSNAME_TLV:
			break;
		case CDP_SYSOBJECT_TLV:
			break;
		case CDP_MANAGEMENT_ADDRESS_TLV:
			break;
		}
	}

	CDPApplianceVLAN = vlan;
	CDPNativeVLAN = nvlan;

	CDPOK = 1;
	return;

 pkt_short:
	printf("** CDP packet is too short\n");
	return;
}

static void CDPStart(void)
{
	printf("Using %s device\n", eth_get_name());
	CDPSeq = 0;
	CDPOK = 0;

	CDPNativeVLAN = htons(-1);
	CDPApplianceVLAN = htons(-1);

	NetSetTimeout(CDP_TIMEOUT, CDPTimeout);
	NetSetHandler(CDPDummyHandler);

	CDPSendTrigger();
}
#endif

#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
/*
 * MAXDEFRAG, above, is chosen in the config file and  is real data
 * so we need to add the NFS overhead, which is more than TFTP.
 * To use sizeof in the internal unnamed structures, we need a real
 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
 * The compiler doesn't complain nor allocates the actual structure
 */
static struct rpc_t rpc_specimen;
#define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))

#define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE_NO_UDP)

/*
 * 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 IP_t *__NetDefragment(IP_t *ip, int *lenp)
{
	static uchar pkt_buff[IP_PKTSIZE] __attribute__((aligned(PKTALIGN)));
	static u16 first_hole, total_len;
	struct hole *payload, *thisfrag, *h, *newh;
	IP_t *localip = (IP_t *)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_NO_UDP);
	offset8 =  (ip_off & IP_OFFS);
	thisfrag = payload + offset8;
	start = offset8 * 8;
	len = ntohs(ip->ip_len) - IP_HDR_SIZE_NO_UDP;

	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_NO_UDP);
	}

	/*
	 * 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_NO_UDP, len);
	if (!done)
		return NULL;

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

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

#else /* !CONFIG_IP_DEFRAG */

static inline IP_t *NetDefragment(IP_t *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(IP_t *ip, int len, IPaddr_t src_ip, Ethernet_t *et)
{
	ICMP_t *icmph = (ICMP_t *)&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;
#if defined(CONFIG_CMD_PING)
	case ICMP_ECHO_REPLY:
		/*
			* IP header OK.  Pass the packet to the
			* current handler.
			*/
		/*
		 * XXX point to ip packet - should this use
		 * packet_icmp_handler?
		 */
		(*packetHandler)((uchar *)ip, 0, src_ip, 0, 0);
		break;
	case ICMP_ECHO_REQUEST:
		debug("Got ICMP ECHO REQUEST, return %d bytes\n",
			ETHER_HDR_SIZE + len);

		memcpy(&et->et_dest[0], &et->et_src[0], 6);
		memcpy(&et->et_src[0], NetOurEther, 6);

		ip->ip_sum = 0;
		ip->ip_off = 0;
		NetCopyIP((void *)&ip->ip_dst, &ip->ip_src);
		NetCopyIP((void *)&ip->ip_src, &NetOurIP);
		ip->ip_sum = ~NetCksum((uchar *)ip,
					IP_HDR_SIZE_NO_UDP >> 1);

		icmph->type = ICMP_ECHO_REPLY;
		icmph->checksum = 0;
		icmph->checksum = ~NetCksum((uchar *)icmph,
			(len - IP_HDR_SIZE_NO_UDP) >> 1);
		(void) eth_send((uchar *)et,
				ETHER_HDR_SIZE + len);
		break;
#endif
	default:
#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
NetReceive(volatile uchar *inpkt, int len)
{
	Ethernet_t *et;
	IP_t	*ip;
	ARP_t	*arp;
	IPaddr_t tmp;
	IPaddr_t src_ip;
	int	x;
	uchar *pkt;
#if defined(CONFIG_CMD_CDP)
	int iscdp;
#endif
	ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;

	debug("packet received\n");

	NetRxPacket = inpkt;
	NetRxPacketLen = len;
	et = (Ethernet_t *)inpkt;

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

#ifdef CONFIG_API
	if (push_packet) {
		(*push_packet)(inpkt, len);
		return;
	}
#endif

#if defined(CONFIG_CMD_CDP)
	/* keep track if packet is CDP */
	iscdp = memcmp(et->et_dest, NetCDPAddr, 6) == 0;
#endif

	myvlanid = ntohs(NetOurVLAN);
	if (myvlanid == (ushort)-1)
		myvlanid = VLAN_NONE;
	mynvlanid = ntohs(NetOurNativeVLAN);
	if (mynvlanid == (ushort)-1)
		mynvlanid = VLAN_NONE;

	x = ntohs(et->et_protlen);

	debug("packet received\n");

	if (x < 1514) {
		/*
		 *	Got a 802 packet.  Check the other protocol field.
		 */
		x = ntohs(et->et_prot);

		ip = (IP_t *)(inpkt + E802_HDR_SIZE);
		len -= E802_HDR_SIZE;

	} else if (x != PROT_VLAN) {	/* normal packet */
		ip = (IP_t *)(inpkt + ETHER_HDR_SIZE);
		len -= ETHER_HDR_SIZE;

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

		debug("VLAN packet received\n");

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

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

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

		ip = (IP_t *)(inpkt + VLAN_ETHER_HDR_SIZE);
		len -= VLAN_ETHER_HDR_SIZE;
	}

	debug("Receive from protocol 0x%x\n", x);

#if defined(CONFIG_CMD_CDP)
	if (iscdp) {
		CDPHandler((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 (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
		 */
		debug("Got ARP\n");

		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 */
			debug("Got ARP REQUEST, return our IP\n");
			pkt = (uchar *)et;
			pkt += NetSetEther(pkt, 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);
			(void) eth_send((uchar *)et,
					(pkt - (uchar *)et) + ARP_HDR_SIZE);
			return;

		case ARPOP_REPLY:		/* arp reply */
			/* are we waiting for a reply */
			if (!NetArpWaitPacketIP || !NetArpWaitPacketMAC)
				break;

#ifdef CONFIG_KEEP_SERVERADDR
			if (NetServerIP == NetArpWaitPacketIP) {
				char buf[20];
				sprintf(buf, "%pM", arp->ar_data);
				setenv("serveraddr", buf);
			}
#endif

			debug("Got ARP REPLY, set server/gtwy eth addr (%pM)\n",
				arp->ar_data);

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

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

#ifdef CONFIG_NETCONSOLE
				(*packetHandler)(0, 0, 0, 0, 0);
#endif
				/* 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;

			}
			return;
		default:
			debug("Unexpected ARP opcode 0x%x\n",
			      ntohs(arp->ar_op));
			return;
		}
		break;

#ifdef CONFIG_CMD_RARP
	case PROT_RARP:
		debug("Got RARP\n");
		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)) {

			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);

			(*packetHandler)(0, 0, 0, 0, 0);
		}
		break;
#endif
	case PROT_IP:
		debug("Got IP\n");
		/* Before we start poking the header, make sure it is there */
		if (len < IP_HDR_SIZE) {
			debug("len bad %d < %lu\n", len, (ulong)IP_HDR_SIZE);
			return;
		}
		/* Check the packet length */
		if (len < ntohs(ip->ip_len)) {
			printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
			return;
		}
		len = ntohs(ip->ip_len);
		debug("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 (!NetCksumOk((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2)) {
			puts("checksum bad\n");
			return;
		}
		/* If it is not for us, ignore it */
		tmp = NetReadIP(&ip->ip_dst);
		if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
#ifdef CONFIG_MCAST_TFTP
			if (Mcast_addr != tmp)
#endif
				return;
		}
		/* Read source IP address for later use */
		src_ip = NetReadIP(&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 = NetDefragment(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;
		}

#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) >> 16) & 0x0000ffff;
			xsum += (ntohl(ip->ip_src) >>  0) & 0x0000ffff;
			xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
			xsum += (ntohl(ip->ip_dst) >>  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


#ifdef CONFIG_NETCONSOLE
		nc_input_packet((uchar *)ip + IP_HDR_SIZE,
						ntohs(ip->udp_dst),
						ntohs(ip->udp_src),
						ntohs(ip->udp_len) - 8);
#endif
		/*
		 *	IP header OK.  Pass the packet to the current handler.
		 */
		(*packetHandler)((uchar *)ip + IP_HDR_SIZE,
						ntohs(ip->udp_dst),
						src_ip,
						ntohs(ip->udp_src),
						ntohs(ip->udp_len) - 8);
		break;
	}
}


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

static int net_check_prereq(enum proto_t protocol)
{
	switch (protocol) {
		/* Fall through */
#if defined(CONFIG_CMD_PING)
	case PING:
		if (NetPingIP == 0) {
			puts("*** ERROR: ping address not given\n");
			return 1;
		}
		goto common;
#endif
#if defined(CONFIG_CMD_SNTP)
	case SNTP:
		if (NetNtpServerIP == 0) {
			puts("*** ERROR: NTP server address not given\n");
			return 1;
		}
		goto common;
#endif
#if defined(CONFIG_CMD_DNS)
	case DNS:
		if (NetOurDNSIP == 0) {
			puts("*** ERROR: DNS server address not given\n");
			return 1;
		}
		goto common;
#endif
#if defined(CONFIG_CMD_NFS)
	case NFS:
#endif
	case TFTPGET:
	case TFTPPUT:
		if (NetServerIP == 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 TFTPSRV:
		if (NetOurIP == 0) {
			puts("*** ERROR: `ipaddr' not set\n");
			return 1;
		}
		/* Fall through */

#ifdef CONFIG_CMD_RARP
	case RARP:
#endif
	case BOOTP:
	case CDP:
	case DHCP:
		if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
			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;
		}
		/* Fall through */
	default:
		return 0;
	}
	return 0;		/* OK */
}
/**********************************************************************/

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


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

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

int
NetEthHdrSize(void)
{
	ushort myvlanid;

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

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

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

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

	memcpy(et->et_dest, addr, 6);
	memcpy(et->et_src, NetOurEther, 6);
	if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
		et->et_protlen = htons(prot);
		return ETHER_HDR_SIZE;
	} else {
		VLAN_Ethernet_t *vet = (VLAN_Ethernet_t *)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;
	}
}

void
NetSetIP(volatile uchar *xip, IPaddr_t dest, int dport, int sport, int len)
{
	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_HDR_SIZE / 4 (not including UDP) */
	ip->ip_hl_v  = 0x45;
	ip->ip_tos   = 0;
	ip->ip_len   = htons(IP_HDR_SIZE + len);
	ip->ip_id    = htons(NetIPID++);
	ip->ip_off   = htons(IP_FLAGS_DFRAG);	/* Don't fragment */
	ip->ip_ttl   = 255;
	ip->ip_p     = 17;		/* UDP */
	ip->ip_sum   = 0;
	/* already in network byte order */
	NetCopyIP((void *)&ip->ip_src, &NetOurIP);
	/* - "" - */
	NetCopyIP((void *)&ip->ip_dst, &dest);
	ip->udp_src  = htons(sport);
	ip->udp_dst  = htons(dport);
	ip->udp_len  = htons(8 + len);
	ip->udp_xsum = 0;
	ip->ip_sum   = ~NetCksum((uchar *)ip, IP_HDR_SIZE_NO_UDP / 2);
}

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(IPaddr_t x, char *s)
{
	x = ntohl(x);
	sprintf(s, "%d.%d.%d.%d",
		(int) ((x >> 24) & 0xff),
		(int) ((x >> 16) & 0xff),
		(int) ((x >> 8) & 0xff), (int) ((x >> 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 getenv_VLAN(char *var)
{
	return string_to_VLAN(getenv(var));
}