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Format of NDIS common characteristics table

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Offset Size Description

00h

WORD

size of table in bytes

02h

BYTE

NDIS major version

03h

BYTE

NDIS minor version

04h

WORD

reserved

06h

BYTE

module major version

07h

BYTE

module minor version

08h

DWORD

module function flag bits
bit 0 : binding at upper boundary supported
bit 1 : binding at lower boundary supported
bit 2 : dynamically bound
bits 3 - 31 : reserved, must be 0

0Ch

16 BYTEs

ASCIZ module name

1Ch

BYTE

upper boundary protocol level (see #01436)

1Dh

BYTE

upper boundary interface type
for MACs : 1 = MAC
for data links and transports : to be defined
for session : 1 = NCB
any level : 0 = private (ISV-defined)

1Eh

BYTE

lower boundary protocol level (see #01436)

1Fh

BYTE

lower boundary interface type same as offset 1Dh

20h

WORD

module ID filled in by protocol manager

22h

WORD

module DS

24h

DWORD

system request entry point

28h

DWORD

pointer to service-specific characteristics (see #01438,#01440) 0000h:0000h if none

2Ch

DWORD

pointer to service-specific status, or 0000h:0000h if none (see #01441)

30h

DWORD

pointer to upper dispatch table (see #01437) 0000h:0000h if none

34h

DWORD

pointer to lower dispatch table (see #01437) 0000h:0000h if none

38h

2 DWORDs

reserved, must be 0

Note:

For compatibility with NDIS 1.x.x, a major version of 00h is interpreted as 01h.