问如何从NDIS数据包缓冲区中识别ipv4或ipv6？

EN

PPF_ETHERNET_HEADER pEthHeader = (PPF_ETHERNET_HEADER) pBuffer;

filter.nEthProto = pEthHeader->nProto;

System::MCopyMemory(&filter.aSrcMac, &pEthHeader->aSrcMac, 
sizeof(ETH_MAC_ADDRESS));

System::MCopyMemory(&filter.aDstMac, &pEthHeader->aDstMac, 
sizeof(ETH_MAC_ADDRESS));

if (filter.nEthProto == ETH_PROTO_IPV4) {

PPF_IPV4_HEADER pIpHeader = (PPF_IPV4_HEADER) (pBuffer + 
sizeof(PF_ETHERNET_HEADER));

/* IPV4 operations */

}

else if (filter.nEthProto == ETH_PROTO_IPV6)
{

PPF_IPV6_HEADER pIpHeader = (PPF_IPV6_HEADER) (pBuffer + 
sizeof(PF_ETHERNET_HEADER));

/* IPV6 operations */
}