_ICMP_FILTER

The _ICMP_FILTER structure specifies Internet Control Message Protocol (ICMP) filtering parameters within a _TRANSPORT_LAYER_FILTER.

Declaration

typedef struct _ICMP_FILTER
{
    DWORD      m_ValidFields;
    BYTE_RANGE m_TypeRange;
    BYTE_RANGE m_CodeRange;
} ICMP_FILTER, *PICMP_FILTER;

Members

m_ValidFields
Bitmask specifying which fields of the structure are active for filtering. Supported flags:

• ICMP_TYPE (0x00000001): Filter matches against the ICMP message type range defined by m_TypeRange.
• ICMP_CODE (0x00000002): Filter matches against the ICMP code range defined by m_CodeRange.

m_TypeRange
A _BYTE_RANGE structure defining the inclusive minimum and maximum ICMP message types (e.g. Type 8 for ICMP Echo Request, Type 0 for ICMP Echo Reply).

m_CodeRange
A _BYTE_RANGE structure defining the inclusive minimum and maximum ICMP message codes.

See Also

_TRANSPORT_LAYER_FILTER, _BYTE_RANGE, _STATIC_FILTER