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Windows Driver Kit DDI reference (ns-packet-_net_packet_layout)

_NET_PACKET_LAYOUT structure

Description

A NET_PACKET_LAYOUT structure describes the start of each protocol header in a NET_PACKET.

Members

`Layer2HeaderLength`

The length in bytes of the Layer 2 header, or zero if the Layer 2 length is unknown.

`Layer3HeaderLength`

The length in bytes of the Layer 3 header, or zero if the Layer 3 length is unknown.

`Layer4HeaderLength`

The length of the Layer 4 header, or zero if the Layer 4 length is unknown.

`Layer2Type`

An enumeration that specifies a flag from NET_PACKET_LAYER2_TYPE.

typedef enum _NET_PACKET_LAYER2_TYPE
{
    NetPacketLayer2TypeUnspecified,
    NetPacketLayer2TypeNull,
    NetPacketLayer2TypeEthernet,
} NET_PACKET_LAYER2_TYPE;

`Layer3Type`

An enumeration that specifies a flag from NET_PACKET_LAYER3_TYPE.

typedef enum _NET_PACKET_LAYER3_TYPE
{
    NetPacketLayer3TypeUnspecified,
    NetPacketLayer3TypeIPv4UnspecifiedOptions,
    NetPacketLayer3TypeIPv4WithOptions,
    NetPacketLayer3TypeIPv4NoOptions,
    NetPacketLayer3TypeIPv6UnspecifiedExtensions,
    NetPacketLayer3TypeIPv6WithExtensions,
    NetPacketLayer3TypeIPv6NoExtensions,
} NET_PACKET_LAYER3_TYPE;

`Layer4Type`

An enumeration that specifies a flag from NET_PACKET_LAYER4_TYPE.

typedef enum _NET_PACKET_LAYER4_TYPE
{
    NetPacketLayer4TypeUnspecified,
    NetPacketLayer4TypeTcp,
    NetPacketLayer4TypeUdp,
    NetPacketLayer4TypeIPFragment,
    NetPacketLayer4TypeIPNotFragment,
} NET_PACKET_LAYER4_TYPE;

`Reserved0`

Reserved for system use.

Remarks

For more info about using this structure, see the Layout member of NET_PACKET.

NET_PACKET_LAYOUT - NtDoc