First Struct: typedef FORWARD_ACTION (*IPPacketFirewallPtr)( VOID **pData, //can be pMdl or pRcvBuf UINT RecvInterfaceIndex, //Received Data UINT *pSendInterfaceIndex, //Index where data is sent UCHAR *pDestinationType, //Can be Local Network, Remote, Broadcast, Multicast. VOID *pContext, //Points to _FIREWALL_CONTEXT_T UINT ContextLength, //sizeof(FIREWALL_CONTEXT_T) struct IPRcvBuf **pRcvBuf ); Second Struct: typedef struct _IP_SET_FIREWALL_HOOK_INFO { IPPacketFirewallPtr FirewallPtr; // Packet filter callout. UINT Priority; // Priority of the hook BOOLEAN Add; // if TRUE then ADD else DELETE } IP_SET_FIREWALL_HOOK_INFO, *PIP_SET_FIREWALL_HOOK_INFO;
#define IOCTL_IP_SET_FIREWALL_HOOK \ _IP_CTL_CODE(12, METHOD_BUFFERED, FILE_WRITE_ACCESS)
#define _IP_CTL_CODE(function, method, access) \ CTL_CODE(FSCTL_IP_BASE, function, method, access)
typedef struct _FIREWALL_CONTEXT_T { DIRECTION_E Direction; void *NTE; void *LinkCtxt; NDIS_HANDLE LContext1; UINT LContext2; } FIREWALL_CONTEXT_T, *PFIREWALL_CONTEXT_T;
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