summaryrefslogtreecommitdiff
path: root/linux/dev/net/core/dev.c
blob: efe024674be947ec9a284d21b34384ebb034c9db (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
/*
 * 	NET3	Protocol independent device support routines.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *	Derived from the non IP parts of dev.c 1.0.19
 * 		Authors:	Ross Biro, <bir7@leland.Stanford.Edu>
 *				Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *				Mark Evans, <evansmp@uhura.aston.ac.uk>
 *
 *	Additional Authors:
 *		Florian la Roche <rzsfl@rz.uni-sb.de>
 *		Alan Cox <gw4pts@gw4pts.ampr.org>
 *		David Hinds <dhinds@allegro.stanford.edu>
 *
 *	Changes:
 *		Alan Cox	:	device private ioctl copies fields back.
 *		Alan Cox	:	Transmit queue code does relevant stunts to
 *					keep the queue safe.
 *		Alan Cox	:	Fixed double lock.
 *		Alan Cox	:	Fixed promisc NULL pointer trap
 *		????????	:	Support the full private ioctl range
 *		Alan Cox	:	Moved ioctl permission check into drivers
 *		Tim Kordas	:	SIOCADDMULTI/SIOCDELMULTI
 *		Alan Cox	:	100 backlog just doesn't cut it when
 *					you start doing multicast video 8)
 *		Alan Cox	:	Rewrote net_bh and list manager.
 *		Alan Cox	: 	Fix ETH_P_ALL echoback lengths.
 *		Alan Cox	:	Took out transmit every packet pass
 *					Saved a few bytes in the ioctl handler
 *		Alan Cox	:	Network driver sets packet type before calling netif_rx. Saves
 *					a function call a packet.
 *		Alan Cox	:	Hashed net_bh()
 *		Richard Kooijman:	Timestamp fixes.
 *		Alan Cox	:	Wrong field in SIOCGIFDSTADDR
 *		Alan Cox	:	Device lock protection.
 *		Alan Cox	: 	Fixed nasty side effect of device close changes.
 *		Rudi Cilibrasi	:	Pass the right thing to set_mac_address()
 *		Dave Miller	:	32bit quantity for the device lock to make it work out
 *					on a Sparc.
 *		Bjorn Ekwall	:	Added KERNELD hack.
 *		Alan Cox	:	Cleaned up the backlog initialise.
 *		Craig Metz	:	SIOCGIFCONF fix if space for under
 *					1 device.
 *	    Thomas Bogendoerfer :	Return ENODEV for dev_open, if there
 *					is no device open function.
 *	    Lawrence V. Stefani	:	Changed set MTU ioctl to not assume
 *					min MTU of 68 bytes for devices
 *					that have change MTU functions.
 *
 */

#include <asm/segment.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/notifier.h>
#include <net/ip.h>
#include <net/route.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/arp.h>
#include <net/slhc.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <net/br.h>
#ifdef CONFIG_NET_ALIAS
#include <linux/net_alias.h>
#endif
#ifdef CONFIG_KERNELD
#include <linux/kerneld.h>
#endif
#ifdef CONFIG_NET_RADIO
#include <linux/wireless.h>
#endif	/* CONFIG_NET_RADIO */

#ifndef MACH
/*
 *	The list of packet types we will receive (as opposed to discard)
 *	and the routines to invoke.
 */

struct packet_type *ptype_base[16];
struct packet_type *ptype_all = NULL;		/* Taps */

/*
 *	Device list lock
 */
 
int dev_lockct=0;
 
/*
 *	Our notifier list
 */
 
struct notifier_block *netdev_chain=NULL;

/*
 *	Device drivers call our routines to queue packets here. We empty the
 *	queue in the bottom half handler.
 */

static struct sk_buff_head backlog;

/* 
 *	We don't overdo the queue or we will thrash memory badly.
 */
 
static int backlog_size = 0;

/*
 *	Return the lesser of the two values. 
 */
 
static __inline__ unsigned long min(unsigned long a, unsigned long b)
{
	return (a < b)? a : b;
}


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

		Protocol management and registration routines

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

/*
 *	For efficiency
 */

static int dev_nit=0;

/*
 *	Add a protocol ID to the list. Now that the input handler is
 *	smarter we can dispense with all the messy stuff that used to be
 *	here.
 */
 
void dev_add_pack(struct packet_type *pt)
{
	int hash;
	if(pt->type==htons(ETH_P_ALL))
	{
		dev_nit++;
		pt->next=ptype_all;
		ptype_all=pt;
	}
	else
	{	
		hash=ntohs(pt->type)&15;
		pt->next = ptype_base[hash];
		ptype_base[hash] = pt;
	}
}


/*
 *	Remove a protocol ID from the list.
 */
 
void dev_remove_pack(struct packet_type *pt)
{
	struct packet_type **pt1;
	if(pt->type==htons(ETH_P_ALL))
	{
		dev_nit--;
		pt1=&ptype_all;
	}
	else
		pt1=&ptype_base[ntohs(pt->type)&15];
	for(; (*pt1)!=NULL; pt1=&((*pt1)->next))
	{
		if(pt==(*pt1))
		{
			*pt1=pt->next;
			return;
		}
	}
	printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
}

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

			    Device Interface Subroutines

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

/* 
 *	Find an interface by name.
 */
 
struct device *dev_get(const char *name)
{
	struct device *dev;

	for (dev = dev_base; dev != NULL; dev = dev->next) 
	{
		if (strcmp(dev->name, name) == 0)
			return(dev);
	}
	return NULL;
}
	
/*
 *	Find and possibly load an interface.
 */
 
#ifdef CONFIG_KERNELD

extern __inline__ void dev_load(const char *name)
{
	if(!dev_get(name) && suser()) {
#ifdef CONFIG_NET_ALIAS
		const char *sptr;
 
		for (sptr=name ; *sptr ; sptr++) if(*sptr==':') break;
		if (!(*sptr && *(sptr+1)))
#endif
		request_module(name);
	}
}

#endif
 
/*
 *	Prepare an interface for use. 
 */
 
int dev_open(struct device *dev)
{
	int ret = -ENODEV;

	/*
	 *	Call device private open method
	 */
	if (dev->open) 
  		ret = dev->open(dev);

	/*
	 *	If it went open OK then set the flags
	 */
	 
	if (ret == 0) 
	{
		dev->flags |= (IFF_UP | IFF_RUNNING);
		/*
		 *	Initialise multicasting status 
		 */
		dev_mc_upload(dev);
		notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
	}
	return(ret);
}


/*
 *	Completely shutdown an interface.
 */
 
int dev_close(struct device *dev)
{
	int ct=0;

	/*
	 *	Call the device specific close. This cannot fail.
	 *	Only if device is UP
	 */
	 
	if ((dev->flags & IFF_UP) && dev->stop)
		dev->stop(dev);

	/*
	 *	Device is now down.
	 */
	 
	dev->flags&=~(IFF_UP|IFF_RUNNING);

	/*
	 *	Tell people we are going down
	 */
	notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
	/*
	 *	Flush the multicast chain
	 */
	dev_mc_discard(dev);

	/*
	 *	Purge any queued packets when we down the link 
	 */
	while(ct<DEV_NUMBUFFS)
	{
		struct sk_buff *skb;
		while((skb=skb_dequeue(&dev->buffs[ct]))!=NULL)
			if(skb->free)
				kfree_skb(skb,FREE_WRITE);
		ct++;
	}
	return(0);
}


/*
 *	Device change register/unregister. These are not inline or static
 *	as we export them to the world.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	return notifier_chain_register(&netdev_chain, nb);
}

int unregister_netdevice_notifier(struct notifier_block *nb)
{
	return notifier_chain_unregister(&netdev_chain,nb);
}

/*
 *	Send (or queue for sending) a packet. 
 *
 *	IMPORTANT: When this is called to resend frames. The caller MUST
 *	already have locked the sk_buff. Apart from that we do the
 *	rest of the magic.
 */

static void do_dev_queue_xmit(struct sk_buff *skb, struct device *dev, int pri)
{
	unsigned long flags;
	struct sk_buff_head *list;
	int retransmission = 0;	/* used to say if the packet should go	*/
				/* at the front or the back of the	*/
				/* queue - front is a retransmit try	*/

	if(pri>=0 && !skb_device_locked(skb))
		skb_device_lock(skb);	/* Shove a lock on the frame */
#if CONFIG_SKB_CHECK 
	IS_SKB(skb);
#endif    
	skb->dev = dev;

	/*
	 *	Negative priority is used to flag a frame that is being pulled from the
	 *	queue front as a retransmit attempt. It therefore goes back on the queue
	 *	start on a failure.
	 */
	 
  	if (pri < 0) 
  	{
		pri = -pri-1;
		retransmission = 1;
  	}

#ifdef CONFIG_NET_DEBUG
	if (pri >= DEV_NUMBUFFS) 
	{
		printk(KERN_WARNING "bad priority in dev_queue_xmit.\n");
		pri = 1;
	}
#endif

	/*
	 *	If the address has not been resolved. Call the device header rebuilder.
	 *	This can cover all protocols and technically not just ARP either.
	 */
	 
	if (!skb->arp && dev->rebuild_header(skb->data, dev, skb->raddr, skb)) {
		return;
	}

	/*
	 *
	 * 	If dev is an alias, switch to its main device.
	 *	"arp" resolution has been made with alias device, so
	 *	arp entries refer to alias, not main.
	 *
	 */

#ifdef CONFIG_NET_ALIAS
	if (net_alias_is(dev))
	  	skb->dev = dev = net_alias_dev_tx(dev);
#endif

	/*
	 *	If we are bridging and this is directly generated output
	 *	pass the frame via the bridge.
	 */

#ifdef CONFIG_BRIDGE
	if(skb->pkt_bridged!=IS_BRIDGED && br_stats.flags & BR_UP)
	{
		if(br_tx_frame(skb))
			return;
	}
#endif

	list = dev->buffs + pri;

	save_flags(flags);
	/* if this isn't a retransmission, use the first packet instead... */
	if (!retransmission) {
		if (skb_queue_len(list)) {
			/* avoid overrunning the device queue.. */
			if (skb_queue_len(list) > dev->tx_queue_len) {
				dev_kfree_skb(skb, FREE_WRITE);
				return;
			}
		}

		/* copy outgoing packets to any sniffer packet handlers */
		if (dev_nit) {
			struct packet_type *ptype;
			skb->stamp=xtime;
			for (ptype = ptype_all; ptype!=NULL; ptype = ptype->next) 
			{
				/* Never send packets back to the socket
				 * they originated from - MvS (miquels@drinkel.ow.org)
				 */
				if ((ptype->dev == dev || !ptype->dev) &&
				   ((struct sock *)ptype->data != skb->sk))
				{
					struct sk_buff *skb2;
					if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL)
						break;
					/* FIXME?: Wrong when the hard_header_len
					 * is an upper bound. Is this even
					 * used anywhere?
					 */
					skb2->h.raw = skb2->data + dev->hard_header_len;
					/* On soft header devices we
					 * yank the header before mac.raw
					 * back off. This is set by
					 * dev->hard_header().
					 */
					if (dev->flags&IFF_SOFTHEADERS)
						skb_pull(skb2,skb2->mac.raw-skb2->data);
					skb2->mac.raw = skb2->data;
					ptype->func(skb2, skb->dev, ptype);
				}
			}
		}

		if (skb_queue_len(list)) {
			cli();
			skb_device_unlock(skb);		/* Buffer is on the device queue and can be freed safely */
			__skb_queue_tail(list, skb);
			skb = __skb_dequeue(list);
			skb_device_lock(skb);		/* New buffer needs locking down */
			restore_flags(flags);
		}
	}
	if (dev->hard_start_xmit(skb, dev) == 0) {
		/*
		 *	Packet is now solely the responsibility of the driver
		 */
		return;
	}

	/*
	 *	Transmission failed, put skb back into a list. Once on the list it's safe and
	 *	no longer device locked (it can be freed safely from the device queue)
	 */
	cli();
	skb_device_unlock(skb);
	__skb_queue_head(list,skb);
	restore_flags(flags);
}

void dev_queue_xmit(struct sk_buff *skb, struct device *dev, int pri)
{
	start_bh_atomic();
	do_dev_queue_xmit(skb, dev, pri);
	end_bh_atomic();
}

/*
 *	Receive a packet from a device driver and queue it for the upper
 *	(protocol) levels.  It always succeeds. This is the recommended 
 *	interface to use.
 */

void netif_rx(struct sk_buff *skb)
{
	static int dropping = 0;

	/*
	 *	Any received buffers are un-owned and should be discarded
	 *	when freed. These will be updated later as the frames get
	 *	owners.
	 */

	skb->sk = NULL;
	skb->free = 1;
	if(skb->stamp.tv_sec==0)
		skb->stamp = xtime;

	/*
	 *	Check that we aren't overdoing things.
	 */

	if (!backlog_size)
  		dropping = 0;
	else if (backlog_size > 300)
		dropping = 1;

	if (dropping) 
	{
		kfree_skb(skb, FREE_READ);
		return;
	}

	/*
	 *	Add it to the "backlog" queue. 
	 */
#if CONFIG_SKB_CHECK
	IS_SKB(skb);
#endif	
	skb_queue_tail(&backlog,skb);
	backlog_size++;
  
	/*
	 *	If any packet arrived, mark it for processing after the
	 *	hardware interrupt returns.
	 */

	mark_bh(NET_BH);
	return;
}

/*
 *	This routine causes all interfaces to try to send some data. 
 */
 
static void dev_transmit(void)
{
	struct device *dev;

	for (dev = dev_base; dev != NULL; dev = dev->next)
	{
		if (dev->flags != 0 && !dev->tbusy) {
			/*
			 *	Kick the device
			 */
			dev_tint(dev);
		}
	}
}


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

			Receive Queue Processor
			
***********************************************************************************/

/*
 *	When we are called the queue is ready to grab, the interrupts are
 *	on and hardware can interrupt and queue to the receive queue as we
 *	run with no problems.
 *	This is run as a bottom half after an interrupt handler that does
 *	mark_bh(NET_BH);
 */
 
void net_bh(void)
{
	struct packet_type *ptype;
	struct packet_type *pt_prev;
	unsigned short type;

	/*
	 *	Can we send anything now? We want to clear the
	 *	decks for any more sends that get done as we
	 *	process the input. This also minimises the
	 *	latency on a transmit interrupt bh.
	 */

	dev_transmit();
  
	/*
	 *	Any data left to process. This may occur because a
	 *	mark_bh() is done after we empty the queue including
	 *	that from the device which does a mark_bh() just after
	 */

	/*
	 *	While the queue is not empty..
	 *
	 *	Note that the queue never shrinks due to
	 *	an interrupt, so we can do this test without
	 *	disabling interrupts.
	 */

	while (!skb_queue_empty(&backlog)) {
		struct sk_buff * skb = backlog.next;

		/*
		 *	We have a packet. Therefore the queue has shrunk
		 */
		cli();
		__skb_unlink(skb, &backlog);
  		backlog_size--;
		sti();
		

#ifdef CONFIG_BRIDGE

		/*
		 *	If we are bridging then pass the frame up to the
		 *	bridging code. If it is bridged then move on
		 */
		 
		if (br_stats.flags & BR_UP)
		{
			/*
			 *	We pass the bridge a complete frame. This means
			 *	recovering the MAC header first.
			 */
			 
			int offset=skb->data-skb->mac.raw;
			cli();
			skb_push(skb,offset);	/* Put header back on for bridge */
			if(br_receive_frame(skb))
			{
				sti();
				continue;
			}
			/*
			 *	Pull the MAC header off for the copy going to
			 *	the upper layers.
			 */
			skb_pull(skb,offset);
			sti();
		}
#endif
		
		/*
	 	 *	Bump the pointer to the next structure.
		 * 
		 *	On entry to the protocol layer. skb->data and
		 *	skb->h.raw point to the MAC and encapsulated data
		 */

		skb->h.raw = skb->data;

		/*
		 * 	Fetch the packet protocol ID. 
		 */
		
		type = skb->protocol;

		/*
		 *	We got a packet ID.  Now loop over the "known protocols"
		 * 	list. There are two lists. The ptype_all list of taps (normally empty)
		 *	and the main protocol list which is hashed perfectly for normal protocols.
		 */
		
		pt_prev = NULL;
		for (ptype = ptype_all; ptype!=NULL; ptype=ptype->next)
		{
			if(!ptype->dev || ptype->dev == skb->dev) {
				if(pt_prev) {
					struct sk_buff *skb2=skb_clone(skb, GFP_ATOMIC);
					if(skb2)
						pt_prev->func(skb2,skb->dev, pt_prev);
				}
				pt_prev=ptype;
			}
		}
		
		for (ptype = ptype_base[ntohs(type)&15]; ptype != NULL; ptype = ptype->next) 
		{
			if (ptype->type == type && (!ptype->dev || ptype->dev==skb->dev))
			{
				/*
				 *	We already have a match queued. Deliver
				 *	to it and then remember the new match
				 */
				if(pt_prev)
				{
					struct sk_buff *skb2;

					skb2=skb_clone(skb, GFP_ATOMIC);

					/*
					 *	Kick the protocol handler. This should be fast
					 *	and efficient code.
					 */

					if(skb2)
						pt_prev->func(skb2, skb->dev, pt_prev);
				}
				/* Remember the current last to do */
				pt_prev=ptype;
			}
		} /* End of protocol list loop */
		
		/*
		 *	Is there a last item to send to ?
		 */

		if(pt_prev)
			pt_prev->func(skb, skb->dev, pt_prev);
		/*
		 * 	Has an unknown packet has been received ?
		 */
	 
		else
			kfree_skb(skb, FREE_WRITE);
		/*
		 *	Again, see if we can transmit anything now. 
		 *	[Ought to take this out judging by tests it slows
		 *	 us down not speeds us up]
		 */
#ifdef XMIT_EVERY
		dev_transmit();
#endif		
  	}	/* End of queue loop */
  	
  	/*
  	 *	We have emptied the queue
  	 */
	
	/*
	 *	One last output flush.
	 */

#ifdef XMIT_AFTER	 
	dev_transmit();
#endif
}


/*
 *	This routine is called when an device driver (i.e. an
 *	interface) is ready to transmit a packet.
 */
 
void dev_tint(struct device *dev)
{
	int i;
	unsigned long flags;
	struct sk_buff_head * head;
	
	/*
	 * aliases do not transmit (for now :) )
	 */

#ifdef CONFIG_NET_ALIAS
	if (net_alias_is(dev)) return;
#endif
	head = dev->buffs;
	save_flags(flags);
	cli();

	/*
	 *	Work the queues in priority order
	 */	 
	for(i = 0;i < DEV_NUMBUFFS; i++,head++)
	{

		while (!skb_queue_empty(head)) {
			struct sk_buff *skb;

			skb = head->next;
			__skb_unlink(skb, head);
			/*
			 *	Stop anyone freeing the buffer while we retransmit it
			 */
			skb_device_lock(skb);
			restore_flags(flags);
			/*
			 *	Feed them to the output stage and if it fails
			 *	indicate they re-queue at the front.
			 */
			do_dev_queue_xmit(skb,dev,-i - 1);
			/*
			 *	If we can take no more then stop here.
			 */
			if (dev->tbusy)
				return;
			cli();
		}
	}
	restore_flags(flags);
}


/*
 *	Perform a SIOCGIFCONF call. This structure will change
 *	size shortly, and there is nothing I can do about it.
 *	Thus we will need a 'compatibility mode'.
 */

static int dev_ifconf(char *arg)
{
	struct ifconf ifc;
	struct ifreq ifr;
	struct device *dev;
	char *pos;
	int len;
	int err;

	/*
	 *	Fetch the caller's info block. 
	 */
	 
	err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifconf));
	if(err)
	  	return err;
	memcpy_fromfs(&ifc, arg, sizeof(struct ifconf));
	len = ifc.ifc_len;
	pos = ifc.ifc_buf;

	/*
	 *	We now walk the device list filling each active device
	 *	into the array.
	 */
	 
	err=verify_area(VERIFY_WRITE,pos,len);
	if(err)
	  	return err;
  	
	/*
	 *	Loop over the interfaces, and write an info block for each. 
	 */

	for (dev = dev_base; dev != NULL; dev = dev->next) 
	{
		if(!(dev->flags & IFF_UP))	/* Downed devices don't count */
			continue;
		/*
		 *	Have we run out of space here ?
		 */
	
		if (len < sizeof(struct ifreq)) 
			break;

		memset(&ifr, 0, sizeof(struct ifreq));
		strcpy(ifr.ifr_name, dev->name);
		(*(struct sockaddr_in *) &ifr.ifr_addr).sin_family = dev->family;
		(*(struct sockaddr_in *) &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr;


		/*
		 *	Write this block to the caller's space. 
		 */
		 
		memcpy_tofs(pos, &ifr, sizeof(struct ifreq));
		pos += sizeof(struct ifreq);
		len -= sizeof(struct ifreq);		
  	}

	/*
	 *	All done.  Write the updated control block back to the caller. 
	 */
	 
	ifc.ifc_len = (pos - ifc.ifc_buf);
	ifc.ifc_req = (struct ifreq *) ifc.ifc_buf;
	memcpy_tofs(arg, &ifc, sizeof(struct ifconf));
	
	/*
	 *	Report how much was filled in
	 */
	 
	return(pos - arg);
}


/*
 *	This is invoked by the /proc filesystem handler to display a device
 *	in detail.
 */

#ifdef CONFIG_PROC_FS
static int sprintf_stats(char *buffer, struct device *dev)
{
	struct enet_statistics *stats = (dev->get_stats ? dev->get_stats(dev): NULL);
	int size;
	
	if (stats)
		size = sprintf(buffer, "%6s:%7d %4d %4d %4d %4d %8d %4d %4d %4d %5d %4d\n",
		   dev->name,
		   stats->rx_packets, stats->rx_errors,
		   stats->rx_dropped + stats->rx_missed_errors,
		   stats->rx_fifo_errors,
		   stats->rx_length_errors + stats->rx_over_errors
		   + stats->rx_crc_errors + stats->rx_frame_errors,
		   stats->tx_packets, stats->tx_errors, stats->tx_dropped,
		   stats->tx_fifo_errors, stats->collisions,
		   stats->tx_carrier_errors + stats->tx_aborted_errors
		   + stats->tx_window_errors + stats->tx_heartbeat_errors);
	else
		size = sprintf(buffer, "%6s: No statistics available.\n", dev->name);

	return size;
}

/*
 *	Called from the PROCfs module. This now uses the new arbitrary sized /proc/net interface
 *	to create /proc/net/dev
 */
 
int dev_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
{
	int len=0;
	off_t begin=0;
	off_t pos=0;
	int size;
	
	struct device *dev;


	size = sprintf(buffer, "Inter-|   Receive                  |  Transmit\n"
			    " face |packets errs drop fifo frame|packets errs drop fifo colls carrier\n");
	
	pos+=size;
	len+=size;
	

	for (dev = dev_base; dev != NULL; dev = dev->next) 
	{
		size = sprintf_stats(buffer+len, dev);
		len+=size;
		pos=begin+len;
				
		if(pos<offset)
		{
			len=0;
			begin=pos;
		}
		if(pos>offset+length)
			break;
	}
	
	*start=buffer+(offset-begin);	/* Start of wanted data */
	len-=(offset-begin);		/* Start slop */
	if(len>length)
		len=length;		/* Ending slop */
	return len;
}
#endif	/* CONFIG_PROC_FS */


#ifdef CONFIG_NET_RADIO
#ifdef CONFIG_PROC_FS

/*
 * Print one entry of /proc/net/wireless
 * This is a clone of /proc/net/dev (just above)
 */
static int
sprintf_wireless_stats(char *		buffer,
		       struct device *	dev)
{
	/* Get stats from the driver */
	struct iw_statistics *stats = (dev->get_wireless_stats ?
				       dev->get_wireless_stats(dev) :
				       (struct iw_statistics *) NULL);
	int size;
	
	if(stats != (struct iw_statistics *) NULL)
		size = sprintf(buffer,
			       "%6s: %02x  %3d%c %3d%c  %3d%c %5d %5d %5d\n",
			       dev->name,
			       stats->status,
			       stats->qual.qual,
			       stats->qual.updated & 1 ? '.' : ' ',
			       stats->qual.level,
			       stats->qual.updated & 2 ? '.' : ' ',
			       stats->qual.noise,
			       stats->qual.updated & 3 ? '.' : ' ',
			       stats->discard.nwid,
			       stats->discard.code,
			       stats->discard.misc);
	else
		size = 0;

	return size;
}

/*
 * Print info for /proc/net/wireless (print all entries)
 * This is a clone of /proc/net/dev (just above)
 */
int
dev_get_wireless_info(char *	buffer,
		      char **	start,
		      off_t	offset,
		      int	length,
		      int	dummy)
{
	int		len = 0;
	off_t		begin = 0;
	off_t		pos = 0;
	int		size;

	struct device *	dev;

	size = sprintf(buffer,
		       "Inter-|sta|  Quality       |  Discarded packets\n"
		       " face |tus|link level noise| nwid crypt  misc\n");
	
	pos+=size;
	len+=size;


	for(dev = dev_base; dev != NULL; dev = dev->next) 
	{
		size = sprintf_wireless_stats(buffer+len, dev);
		len+=size;
		pos=begin+len;

		if(pos < offset)
		{
			len=0;
			begin=pos;
		}
		if(pos > offset + length)
			break;
	}

	*start = buffer + (offset - begin);	/* Start of wanted data */
	len -= (offset - begin);		/* Start slop */
	if(len > length)
		len = length;		/* Ending slop */

	return len;
}
#endif	/* CONFIG_PROC_FS */
#endif	/* CONFIG_NET_RADIO */


/*
 *	This checks bitmasks for the ioctl calls for devices.
 */
 
static inline int bad_mask(unsigned long mask, unsigned long addr)
{
	if (addr & (mask = ~mask))
		return 1;
	mask = ntohl(mask);
	if (mask & (mask+1))
		return 1;
	return 0;
}

/*
 *	Perform the SIOCxIFxxx calls. 
 *
 *	The socket layer has seen an ioctl the address family thinks is
 *	for the device. At this point we get invoked to make a decision
 */
 
static int dev_ifsioc(void *arg, unsigned int getset)
{
	struct ifreq ifr;
	struct device *dev;
	int ret;

	/*
	 *	Fetch the caller's info block into kernel space
	 */

	int err=verify_area(VERIFY_WRITE, arg, sizeof(struct ifreq));
	if(err)
		return err;
	
	memcpy_fromfs(&ifr, arg, sizeof(struct ifreq));

	/*
	 *	See which interface the caller is talking about. 
	 */
	 
	/*
	 *
	 *	net_alias_dev_get(): dev_get() with added alias naming magic.
	 *	only allow alias creation/deletion if (getset==SIOCSIFADDR)
	 *
	 */
	 
#ifdef CONFIG_KERNELD
	dev_load(ifr.ifr_name);
#endif	

#ifdef CONFIG_NET_ALIAS
	if ((dev = net_alias_dev_get(ifr.ifr_name, getset == SIOCSIFADDR, &err, NULL, NULL)) == NULL)
		return(err);
#else
	if ((dev = dev_get(ifr.ifr_name)) == NULL) 	
		return(-ENODEV);
#endif
	switch(getset) 
	{
		case SIOCGIFFLAGS:	/* Get interface flags */
			ifr.ifr_flags = (dev->flags & ~IFF_SOFTHEADERS);
			goto rarok;

		case SIOCSIFFLAGS:	/* Set interface flags */
			{
				int old_flags = dev->flags;
				
				if(securelevel>0)
					ifr.ifr_flags&=~IFF_PROMISC;
				/*
				 *	We are not allowed to potentially close/unload
				 *	a device until we get this lock.
				 */
				
				dev_lock_wait();
				
				/*
				 *	Set the flags on our device.
				 */
				 
				dev->flags = (ifr.ifr_flags & (
					IFF_BROADCAST | IFF_DEBUG | IFF_LOOPBACK |
					IFF_POINTOPOINT | IFF_NOTRAILERS | IFF_RUNNING |
					IFF_NOARP | IFF_PROMISC | IFF_ALLMULTI | IFF_SLAVE | IFF_MASTER
					| IFF_MULTICAST)) | (dev->flags & (IFF_SOFTHEADERS|IFF_UP));
				/*
				 *	Load in the correct multicast list now the flags have changed.
				 */				

				dev_mc_upload(dev);

			  	/*
			  	 *	Have we downed the interface. We handle IFF_UP ourselves
			  	 *	according to user attempts to set it, rather than blindly
			  	 *	setting it.
			  	 */
			  	 
			  	if ((old_flags^ifr.ifr_flags)&IFF_UP)	/* Bit is different  ? */
			  	{
					if(old_flags&IFF_UP)		/* Gone down */
						ret=dev_close(dev); 		
					else				/* Come up */
					{
						ret=dev_open(dev);
						if(ret<0)
							dev->flags&=~IFF_UP;	/* Open failed */
					}	
			  	}
			  	else
			  		ret=0;
				/*
				 *	Load in the correct multicast list now the flags have changed.
				 */				

				dev_mc_upload(dev);
			}
			break;
		
		case SIOCGIFADDR:	/* Get interface address (and family) */
			if(ifr.ifr_addr.sa_family==AF_UNSPEC)
			{
				memcpy(ifr.ifr_hwaddr.sa_data,dev->dev_addr, MAX_ADDR_LEN);
				ifr.ifr_hwaddr.sa_family=dev->type;			
				goto rarok;
			}
			else
			{
				(*(struct sockaddr_in *)
					  &ifr.ifr_addr).sin_addr.s_addr = dev->pa_addr;
				(*(struct sockaddr_in *)
					  &ifr.ifr_addr).sin_family = dev->family;
				(*(struct sockaddr_in *)
					  &ifr.ifr_addr).sin_port = 0;
			}
			goto rarok;
	
		case SIOCSIFADDR:	/* Set interface address (and family) */
		
			/*
			 *	BSDism. SIOCSIFADDR family=AF_UNSPEC sets the
			 *	physical address. We can cope with this now.
			 */
			
			if(ifr.ifr_addr.sa_family==AF_UNSPEC)
			{
				if(dev->set_mac_address==NULL)
					return -EOPNOTSUPP;
				if(securelevel>0)
					return -EPERM;
				ret=dev->set_mac_address(dev,&ifr.ifr_addr);
			}
			else
			{
				u32 new_pa_addr = (*(struct sockaddr_in *)
					 &ifr.ifr_addr).sin_addr.s_addr;
				u16 new_family = ifr.ifr_addr.sa_family;

				if (new_family == dev->family &&
				    new_pa_addr == dev->pa_addr) {
					ret =0;
					break;
				}
				if (dev->flags & IFF_UP)
					notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);

				/*
				 *	if dev is an alias, must rehash to update
				 *	address change
				 */

#ifdef CONFIG_NET_ALIAS
			  	if (net_alias_is(dev))
				    	net_alias_dev_rehash(dev ,&ifr.ifr_addr);
#endif
				dev->pa_addr = new_pa_addr;
				dev->family = new_family;
			
#ifdef CONFIG_INET	
				/* This is naughty. When net-032e comes out It wants moving into the net032
				   code not the kernel. Till then it can sit here (SIGH) */		
				if (!dev->pa_mask)
					dev->pa_mask = ip_get_mask(dev->pa_addr);
#endif			
				if (!dev->pa_brdaddr)
					dev->pa_brdaddr = dev->pa_addr | ~dev->pa_mask;
				if (dev->flags & IFF_UP)
					notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
				ret = 0;
			}
			break;
			
		case SIOCGIFBRDADDR:	/* Get the broadcast address */
			(*(struct sockaddr_in *)
				&ifr.ifr_broadaddr).sin_addr.s_addr = dev->pa_brdaddr;
			(*(struct sockaddr_in *)
				&ifr.ifr_broadaddr).sin_family = dev->family;
			(*(struct sockaddr_in *)
				&ifr.ifr_broadaddr).sin_port = 0;
			goto rarok;

		case SIOCSIFBRDADDR:	/* Set the broadcast address */
			dev->pa_brdaddr = (*(struct sockaddr_in *)
				&ifr.ifr_broadaddr).sin_addr.s_addr;
			ret = 0;
			break;
			
		case SIOCGIFDSTADDR:	/* Get the destination address (for point-to-point links) */
			(*(struct sockaddr_in *)
				&ifr.ifr_dstaddr).sin_addr.s_addr = dev->pa_dstaddr;
			(*(struct sockaddr_in *)
				&ifr.ifr_dstaddr).sin_family = dev->family;
			(*(struct sockaddr_in *)
				&ifr.ifr_dstaddr).sin_port = 0;
			goto rarok;
	
		case SIOCSIFDSTADDR:	/* Set the destination address (for point-to-point links) */
			dev->pa_dstaddr = (*(struct sockaddr_in *)
				&ifr.ifr_dstaddr).sin_addr.s_addr;
			ret = 0;
			break;
			
		case SIOCGIFNETMASK:	/* Get the netmask for the interface */
			(*(struct sockaddr_in *)
				&ifr.ifr_netmask).sin_addr.s_addr = dev->pa_mask;
			(*(struct sockaddr_in *)
				&ifr.ifr_netmask).sin_family = dev->family;
			(*(struct sockaddr_in *)
				&ifr.ifr_netmask).sin_port = 0;
			goto rarok;

		case SIOCSIFNETMASK: 	/* Set the netmask for the interface */
			{
				unsigned long mask = (*(struct sockaddr_in *)
					&ifr.ifr_netmask).sin_addr.s_addr;
				ret = -EINVAL;
				/*
				 *	The mask we set must be legal.
				 */
				if (bad_mask(mask,0))
					break;
				dev->pa_mask = mask;
				ret = 0;
			}
			break;
			
		case SIOCGIFMETRIC:	/* Get the metric on the interface (currently unused) */
			
			ifr.ifr_metric = dev->metric;
			goto  rarok;
			
		case SIOCSIFMETRIC:	/* Set the metric on the interface (currently unused) */
			dev->metric = ifr.ifr_metric;
			ret=0;
			break;
	
		case SIOCGIFMTU:	/* Get the MTU of a device */
			ifr.ifr_mtu = dev->mtu;
			goto rarok;
	
		case SIOCSIFMTU:	/* Set the MTU of a device */
		
			if (dev->change_mtu)
				ret = dev->change_mtu(dev, ifr.ifr_mtu);
			else
			{
				/*
				 *	MTU must be positive.
				 */
			 
				if(ifr.ifr_mtu<68)
					return -EINVAL;

				dev->mtu = ifr.ifr_mtu;
				ret = 0;
			}
			break;
	
		case SIOCGIFMEM:	/* Get the per device memory space. We can add this but currently
					   do not support it */
			ret = -EINVAL;
			break;
		
		case SIOCSIFMEM:	/* Set the per device memory buffer space. Not applicable in our case */
			ret = -EINVAL;
			break;

		case SIOCGIFHWADDR:
			memcpy(ifr.ifr_hwaddr.sa_data,dev->dev_addr, MAX_ADDR_LEN);
			ifr.ifr_hwaddr.sa_family=dev->type;			
			goto rarok;
				
		case SIOCSIFHWADDR:
			if(dev->set_mac_address==NULL)
				return -EOPNOTSUPP;
			if(securelevel > 0)
				return -EPERM;
			if(ifr.ifr_hwaddr.sa_family!=dev->type)
				return -EINVAL;
			ret=dev->set_mac_address(dev,&ifr.ifr_hwaddr);
			break;
			
		case SIOCGIFMAP:
			ifr.ifr_map.mem_start=dev->mem_start;
			ifr.ifr_map.mem_end=dev->mem_end;
			ifr.ifr_map.base_addr=dev->base_addr;
			ifr.ifr_map.irq=dev->irq;
			ifr.ifr_map.dma=dev->dma;
			ifr.ifr_map.port=dev->if_port;
			goto rarok;
			
		case SIOCSIFMAP:
			if(dev->set_config==NULL)
				return -EOPNOTSUPP;
			return dev->set_config(dev,&ifr.ifr_map);
			
		case SIOCADDMULTI:
			if(dev->set_multicast_list==NULL)
				return -EINVAL;
			if(ifr.ifr_hwaddr.sa_family!=AF_UNSPEC)
				return -EINVAL;
			dev_mc_add(dev,ifr.ifr_hwaddr.sa_data, dev->addr_len, 1);
			return 0;

		case SIOCDELMULTI:
			if(dev->set_multicast_list==NULL)
				return -EINVAL;
			if(ifr.ifr_hwaddr.sa_family!=AF_UNSPEC)
				return -EINVAL;
			dev_mc_delete(dev,ifr.ifr_hwaddr.sa_data,dev->addr_len, 1);
			return 0;
		/*
		 *	Unknown or private ioctl
		 */

		default:
			if((getset >= SIOCDEVPRIVATE) &&
			   (getset <= (SIOCDEVPRIVATE + 15))) {
				if(dev->do_ioctl==NULL)
					return -EOPNOTSUPP;
				ret=dev->do_ioctl(dev, &ifr, getset);
				memcpy_tofs(arg,&ifr,sizeof(struct ifreq));
				break;
			}

#ifdef CONFIG_NET_RADIO
			if((getset >= SIOCIWFIRST) &&
			   (getset <= SIOCIWLAST))
			{
				if(dev->do_ioctl==NULL)
					return -EOPNOTSUPP;
				/* Perform the ioctl */
				ret=dev->do_ioctl(dev, &ifr, getset);
				/* If return args... */
				if(IW_IS_GET(getset))
					memcpy_tofs(arg, &ifr,
						    sizeof(struct ifreq));
				break;
			}
#endif	/* CONFIG_NET_RADIO */

			ret = -EINVAL;
	}
	return(ret);
/*
 *	The load of calls that return an ifreq and ok (saves memory).
 */
rarok:
	memcpy_tofs(arg, &ifr, sizeof(struct ifreq));
	return 0;
}


/*
 *	This function handles all "interface"-type I/O control requests. The actual
 *	'doing' part of this is dev_ifsioc above.
 */

int dev_ioctl(unsigned int cmd, void *arg)
{
	switch(cmd) 
	{
		case SIOCGIFCONF:
			(void) dev_ifconf((char *) arg);
			return 0;

		/*
		 *	Ioctl calls that can be done by all.
		 */
		 
		case SIOCGIFFLAGS:
		case SIOCGIFADDR:
		case SIOCGIFDSTADDR:
		case SIOCGIFBRDADDR:
		case SIOCGIFNETMASK:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFMEM:
		case SIOCGIFHWADDR:
		case SIOCGIFSLAVE:
		case SIOCGIFMAP:
			return dev_ifsioc(arg, cmd);

		/*
		 *	Ioctl calls requiring the power of a superuser
		 */
		 
		case SIOCSIFFLAGS:
		case SIOCSIFADDR:
		case SIOCSIFDSTADDR:
		case SIOCSIFBRDADDR:
		case SIOCSIFNETMASK:
		case SIOCSIFMETRIC:
		case SIOCSIFMTU:
		case SIOCSIFMEM:
		case SIOCSIFHWADDR:
		case SIOCSIFMAP:
		case SIOCSIFSLAVE:
		case SIOCADDMULTI:
		case SIOCDELMULTI:
			if (!suser())
				return -EPERM;
			return dev_ifsioc(arg, cmd);
	
		case SIOCSIFLINK:
			return -EINVAL;

		/*
		 *	Unknown or private ioctl.
		 */	
		 
		default:
			if((cmd >= SIOCDEVPRIVATE) &&
			   (cmd <= (SIOCDEVPRIVATE + 15))) {
				return dev_ifsioc(arg, cmd);
			}
#ifdef CONFIG_NET_RADIO
			if((cmd >= SIOCIWFIRST) &&
			   (cmd <= SIOCIWLAST))
			{
				if((IW_IS_SET(cmd)) && (!suser()))
					return -EPERM;
				return dev_ifsioc(arg, cmd);
			}
#endif	/* CONFIG_NET_RADIO */
			return -EINVAL;
	}
}
#endif /* !MACH */


/*
 *	Initialize the DEV module. At boot time this walks the device list and
 *	unhooks any devices that fail to initialise (normally hardware not 
 *	present) and leaves us with a valid list of present and active devices.
 *
 */
extern int lance_init(void);
extern int pi_init(void);
extern void sdla_setup(void);
extern int dlci_setup(void);

int net_dev_init(void)
{
	struct device *dev, **dp;

	/*
	 *	Initialise the packet receive queue.
	 */

#ifndef MACH
	skb_queue_head_init(&backlog);
#endif
	
	/*
	 *	The bridge has to be up before the devices
	 */

#ifdef CONFIG_BRIDGE	 
	br_init();
#endif	
	
	/*
	 * This is Very Ugly(tm).
	 *
	 * Some devices want to be initialized early..
	 */
#if defined(CONFIG_PI)
	pi_init();
#endif	
#if defined(CONFIG_PT)
	pt_init();
#endif
#if defined(CONFIG_DLCI)
	dlci_setup();
#endif
#if defined(CONFIG_SDLA)
	sdla_setup();
#endif
	/*
	 *	SLHC if present needs attaching so other people see it
	 *	even if not opened.
	 */
#if (defined(CONFIG_SLIP) && defined(CONFIG_SLIP_COMPRESSED)) \
	 || defined(CONFIG_PPP) \
    || (defined(CONFIG_ISDN) && defined(CONFIG_ISDN_PPP))
	slhc_install();
#endif	

	/*
	 *	Add the devices.
	 *	If the call to dev->init fails, the dev is removed
	 *	from the chain disconnecting the device until the
	 *	next reboot.
	 */

	dp = &dev_base;
	while ((dev = *dp) != NULL)
	{
		int i;
		for (i = 0; i < DEV_NUMBUFFS; i++)  {
			skb_queue_head_init(dev->buffs + i);
		}

		if (dev->init && dev->init(dev)) 
		{
			/*
			 *	It failed to come up. Unhook it.
			 */
			*dp = dev->next;
		} 
		else
		{
			dp = &dev->next;
		}
	}

#ifdef CONFIG_PROC_FS
	proc_net_register(&(struct proc_dir_entry) {
		PROC_NET_DEV, 3, "dev",
		S_IFREG | S_IRUGO, 1, 0, 0,
		0, &proc_net_inode_operations,
		dev_get_info
	});
#endif

#ifdef CONFIG_NET_RADIO
#ifdef CONFIG_PROC_FS
	proc_net_register(&(struct proc_dir_entry) {
		PROC_NET_WIRELESS, 8, "wireless",
		S_IFREG | S_IRUGO, 1, 0, 0,
		0, &proc_net_inode_operations,
		dev_get_wireless_info
	});
#endif	/* CONFIG_PROC_FS */
#endif	/* CONFIG_NET_RADIO */

	/*	
	 *	Initialise net_alias engine 
	 *
	 *		- register net_alias device notifier
	 *		- register proc entries:	/proc/net/alias_types
	 *									/proc/net/aliases
	 */

#ifdef CONFIG_NET_ALIAS
	net_alias_init();
#endif

	init_bh(NET_BH, net_bh);
	return 0;
}