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GetAnycastIpAddressTable (NETIOAPI) (Compact 2013)

  • Article

3/26/2014

This function retrieves the anycast IP address table on a local device.

Syntax

NETIOAPI_API
  GetAnycastIpAddressTable(
    IN ADDRESS_FAMILY  Family,
    OUT PMIB_ANYCASTIPADDRESS_TABLE*  Table
    );

Parameters

  • Family
    The address family to retrieve.

    Possible values for the address family are listed in the Winsock2.h header file. Note that the values for the AF_ address family and PF_ protocol family constants are identical (for example, AF_INET and PF_INET), so you can use either constant.

    Possible values for the Family parameter are defined in the Ws2def.h header file. Note that the Ws2def.h header file is automatically included in Netioapi.h and you should never use Ws2def.h directly.

    The following values are currently supported for the address family:

    • AF_UNSPEC
      The address family is unspecified. When this value is specified, this function returns the anycast IP address table that contains both IPv4 and IPv6 entries.
    • AF_INET
      The IPv4 address family. When this value is specified, this function returns the anycast IP address table that contains only IPv4 entries.
    • AF_INET6
      The IPv6 address family. When this value is specified, this function returns the anycast IP address table that contains only IPv6 entries.
  • Table
    A pointer to a MIB_ANYCASTIPADDRESS_TABLE structure that contains a table of anycast IP address entries on the local device.

Return Value

GetAnycastIpAddressTable returns STATUS_SUCCESS if the function succeeds.

If the function fails, GetAnycastIpAddressTable returns one of the following error codes:

Error Code

Meaning

STATUS_INVALID_PARAMETER

An invalid parameter was passed to the function. This error is returned if a NULL pointer is passed in the Table parameter or the Family parameter was not specified as AF_INET, AF_INET6, or AF_UNSPEC.

STATUS_NOT_ENOUGH_MEMORY

Insufficient memory resources are available to complete the operation.

STATUS_NOT_FOUND

No anycast IP address entries, as specified in the Family parameter, were found.

STATUS_NOT_SUPPORTED

The request is not supported. This error is returned if no IPv4 stack is located on the local device and AF_INET was specified in the Family parameter, or if no IPv6 stack is located on the local device and AF_INET6 was specified in the Family parameter. This error is also returned on versions of Windows where this function is not supported.

Other

Use the FormatMessage function to obtain the message string for the returned error.

Remarks

The GetAnycastIpAddressTable function enumerates the anycast IP addresses on a local device and returns this information in a MIB_ANYCASTIPADDRESS_TABLE structure.

The anycast IP address entries are returned in a MIB_ANYCASTIPADDRESS_TABLE structure in the buffer that the Table parameter points to. The MIB_ANYCASTIPADDRESS_TABLE structure contains an anycast IP address entry count and an array of MIB_ANYCASTIPADDRESS_ROW structures for each anycast IP address entry. When these returned structures are no longer required, your driver should free the memory by calling the FreeMibTable (NETIOAPI).

Your driver must initialize the Family parameter to either AF_INET, AF_INET6, or AF_UNSPEC.

Note that the returned MIB_ANYCASTIPADDRESS_TABLE structure that the Table parameter points to might contain padding for alignment between the NumEntries member and the first MIB_ANYCASTIPADDRESS_ROW array entry in the Table member of the MIB_ANYCASTIPADDRESS_TABLE structure. Padding for alignment might also be present between the MIB_ANYCASTIPADDRESS_ROW array entries. Any access to a MIB_ANYCASTIPADDRESS_ROW array entry should assume padding may exist.

See Also

Reference

IP Helper Kernel-Mode Functions
FreeMibTable
MIB_ANYCASTIPADDRESS_ROW
MIB_ANYCASTIPADDRESS_TABLE