NDIS PACKET结构，如何COPY？

NDIS PACKET封装了一个网络数据包，在以太网中，就是以太网封包，有时需要对数据进行拷贝再进行特殊的处理，如何做，它的结构体是什么样了？ 基本框架结构： typedef struct _NDIS_PACKET { NDIS_PACKET_PRIVATE Private; union { struct // For Connection-less miniports { UCHAR MiniportReserved[2*sizeof(PVOID)]; UCHAR WrapperReserved[2*sizeof(PVOID)]; }; struct { // // For de-serialized miniports. And by implication conn-oriented miniports. // UCHAR MiniportReservedEx[3*sizeof(PVOID)]; UCHAR WrapperReservedEx[sizeof(PVOID)]; }; struct { UCHAR MacReserved[4*sizeof(PVOID)]; }; }; ULONG_PTR Reserved[2]; // For compatibility with Win95 UCHAR ProtocolReserved[1]; } NDIS_PACKET, *PNDIS_PACKET, **PPNDIS_PACKET; 其中的最后一个成员是动态长度，在使用NDIS API 分配包时，可以自行指定，但它并不是这么简单。 其中用到的NDIS_PACKET_PRIVATE结构： // // // wrapper-specific part of a packet // typedef struct _NDIS_PACKET_PRIVATE { UINT PhysicalCount; // number of physical pages in packet. UINT TotalLength; // Total amount of data in the packet. PNDIS_BUFFER Head; // first buffer in the chain PNDIS_BUFFER Tail; // last buffer in the chain // if Head is NULL the chain is empty; Tail doesn't have to be NULL also PNDIS_PACKET_POOL Pool; // so we know where to free it back to UINT Count; ULONG Flags; BOOLEAN ValidCounts; UCHAR NdisPacketFlags; // See fPACKET_xxx bits below USHORT NdisPacketOobOffset; } NDIS_PACKET_PRIVATE, * PNDIS_PACKET_PRIVATE; 其中最后一个成员是一个偏移量，指示出的包数据结构的OOB数据结构成员的偏移量，对应一个NDIS_PACKET_OOB_DATA结构体： typedef struct _NDIS_PACKET_OOB_DATA { union { ULONGLONG TimeToSend; ULONGLONG TimeSent; }; ULONGLONG TimeReceived; UINT HeaderSize; UINT SizeMediaSpecificInfo; PVOID MediaSpecificInformation; NDIS_STATUS Status; } NDIS_PACKET_OOB_DATA, *PNDIS_PACKET_OOB_DATA; 但是在这之后，还有一个数据成员，记录此包的更多相关信息： typedef struct _NDIS_PACKET_EXTENSION { PVOID NdisPacketInfo[MaxPerPacketInfo]; } NDIS_PACKET_EXTENSION, *PNDIS_PACKET_EXTENSION; typedef enum _NDIS_PER_PACKET_INFO { TcpIpChecksumPacketInfo, IpSecPacketInfo, TcpLargeSendPacketInfo, ClassificationHandlePacketInfo, NdisReserved, ScatterGatherListPacketInfo, Ieee8021QInfo, OriginalPacketInfo, PacketCancelId, OriginalNetBufferList, CachedNetBufferList, ShortPacketPaddingInfo, MaxPerPacketInfo } NDIS_PER_PACKET_INFO, *PNDIS_PER_PACKET_INFO; 综上所述，一个数据包的数据结构如下： |NDIS_PACKET|PROTOCOL_RESERVED(DYNAMIC)|NDIS_PACKET_OOB_DATA|NDIS_PACKET_EXTENSION 如果需要拷贝一个数据包，需要注意所有以上相关数据成员。