GROUP_FILTER

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct SOCKADDR_STORAGE
{
    public ushort ss_family;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)] public sbyte[] __ss_pad1;
    public long __ss_align;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 112)] public sbyte[] __ss_pad2;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct GROUP_FILTER
{
    public uint gf_interface;
    public SOCKADDR_STORAGE gf_group;
    public int gf_fmode;
    public uint gf_numsrc;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)] public SOCKADDR_STORAGE[] gf_slist;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure SOCKADDR_STORAGE
    Public ss_family As UShort
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=6)> Public __ss_pad1() As SByte
    Public __ss_align As Long
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=112)> Public __ss_pad2() As SByte
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure GROUP_FILTER
    Public gf_interface As UInteger
    Public gf_group As SOCKADDR_STORAGE
    Public gf_fmode As Integer
    Public gf_numsrc As UInteger
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=1)> Public gf_slist() As SOCKADDR_STORAGE
End Structure

import ctypes
from ctypes import wintypes

class SOCKADDR_STORAGE(ctypes.Structure):
    _fields_ = [
        ("ss_family", ctypes.c_ushort),
        ("__ss_pad1", ctypes.c_byte * 6),
        ("__ss_align", ctypes.c_longlong),
        ("__ss_pad2", ctypes.c_byte * 112),
    ]

class GROUP_FILTER(ctypes.Structure):
    _fields_ = [
        ("gf_interface", wintypes.DWORD),
        ("gf_group", SOCKADDR_STORAGE),
        ("gf_fmode", ctypes.c_int),
        ("gf_numsrc", wintypes.DWORD),
        ("gf_slist", SOCKADDR_STORAGE * 1),
    ]

#[repr(C)]
pub struct SOCKADDR_STORAGE {
    pub ss_family: u16,
    pub __ss_pad1: [i8; 6],
    pub __ss_align: i64,
    pub __ss_pad2: [i8; 112],
}

#[repr(C)]
pub struct GROUP_FILTER {
    pub gf_interface: u32,
    pub gf_group: SOCKADDR_STORAGE,
    pub gf_fmode: i32,
    pub gf_numsrc: u32,
    pub gf_slist: [SOCKADDR_STORAGE; 1],
}

import "golang.org/x/sys/windows"

type SOCKADDR_STORAGE struct {
	ss_family uint16
	__ss_pad1 [6]int8
	__ss_align int64
	__ss_pad2 [112]int8
}

type GROUP_FILTER struct {
	gf_interface uint32
	gf_group SOCKADDR_STORAGE
	gf_fmode int32
	gf_numsrc uint32
	gf_slist [1]SOCKADDR_STORAGE
}

type
  SOCKADDR_STORAGE = record
    ss_family: Word;
    __ss_pad1: array[0..5] of Shortint;
    __ss_align: Int64;
    __ss_pad2: array[0..111] of Shortint;
  end;

  GROUP_FILTER = record
    gf_interface: DWORD;
    gf_group: SOCKADDR_STORAGE;
    gf_fmode: Integer;
    gf_numsrc: DWORD;
    gf_slist: array[0..0] of SOCKADDR_STORAGE;
  end;

const SOCKADDR_STORAGE = extern struct {
    ss_family: u16,
    __ss_pad1: [6]i8,
    __ss_align: i64,
    __ss_pad2: [112]i8,
};

const GROUP_FILTER = extern struct {
    gf_interface: u32,
    gf_group: SOCKADDR_STORAGE,
    gf_fmode: i32,
    gf_numsrc: u32,
    gf_slist: [1]SOCKADDR_STORAGE,
};

type
  SOCKADDR_STORAGE {.bycopy.} = object
    ss_family: uint16
    __ss_pad1: array[6, int8]
    __ss_align: int64
    __ss_pad2: array[112, int8]

  GROUP_FILTER {.bycopy.} = object
    gf_interface: uint32
    gf_group: SOCKADDR_STORAGE
    gf_fmode: int32
    gf_numsrc: uint32
    gf_slist: array[1, SOCKADDR_STORAGE]

struct SOCKADDR_STORAGE
{
    ushort ss_family;
    byte[6] __ss_pad1;
    long __ss_align;
    byte[112] __ss_pad2;
}

struct GROUP_FILTER
{
    uint gf_interface;
    SOCKADDR_STORAGE gf_group;
    int gf_fmode;
    uint gf_numsrc;
    SOCKADDR_STORAGE[1] gf_slist;
}