NET_BUFFER_DATA - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// nbl.h
typedef struct _NET_BUFFER_DATA {
NET_BUFFER *Next;
MDL *CurrentMdl;
ULONG CurrentMdlOffset;
NET_BUFFER_DATA_LENGTH NbDataLength;
MDL *MdlChain;
ULONG DataOffset;
} NET_BUFFER_DATA, *PNET_BUFFER_DATA;
View the official Windows Driver Kit DDI referenceNo description available.
The NET_BUFFER_DATA structure contains information for managing the data buffers that are attached to a NET_BUFFER structure, and it identifies the next NET_BUFFER structure in a list of NET_BUFFER structures.
NextA pointer to the next NET_BUFFER structure in a linked list of NET_BUFFER structures. If this structure is the last NET_BUFFER structure in the list, this member is NULL.
CurrentMdlA pointer to the first MDL that the current driver is using. This member provides an optimization that improves performance by skipping over any MDLs that the current driver is not using.
CurrentMdlOffsetThe offset, in bytes, to the beginning of the used data space in the MDL that is specified by the CurrentMdl member.
NbDataLengthThe length, in bytes, of the used data space in the MDL chain. The maximum length is 0xFFFFFFFF bytes.
MdlChainA pointer to a linked list of MDLs that map a data buffer. The data buffer stores the network data.
DataOffsetThe offset, in bytes, from the beginning of the MDL chain to the beginning of the network data in the MDL chain. This offset is also the size, in bytes, of the unused data space.
The NET_BUFFER_HEADER structure contains a NET_BUFFER_DATA structure that defines data for the NET_BUFFER structure. To access the members of NET_BUFFER_DATA, use the NdisRetreatNetBufferDataStart and NdisAdvanceNetBufferDataStart functions, and the following macros:
Note The C and C++ compilers use different definitions for these macros. Failure to use the macros can cause problems when switching compilers.