vendor/golang.org/x/net/ipv4/sys_windows.go

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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package ipv4

import (
	"golang.org/x/net/internal/iana"
	"golang.org/x/net/internal/socket"
)

const (
	// See ws2tcpip.h.
	sysIP_OPTIONS                = 0x1
	sysIP_HDRINCL                = 0x2
	sysIP_TOS                    = 0x3
	sysIP_TTL                    = 0x4
	sysIP_MULTICAST_IF           = 0x9
	sysIP_MULTICAST_TTL          = 0xa
	sysIP_MULTICAST_LOOP         = 0xb
	sysIP_ADD_MEMBERSHIP         = 0xc
	sysIP_DROP_MEMBERSHIP        = 0xd
	sysIP_DONTFRAGMENT           = 0xe
	sysIP_ADD_SOURCE_MEMBERSHIP  = 0xf
	sysIP_DROP_SOURCE_MEMBERSHIP = 0x10
	sysIP_PKTINFO                = 0x13

	sizeofInetPktinfo  = 0x8
	sizeofIPMreq       = 0x8
	sizeofIPMreqSource = 0xc
)

type inetPktinfo struct {
	Addr    [4]byte
	Ifindex int32
}

type ipMreq struct {
	Multiaddr [4]byte
	Interface [4]byte
}

type ipMreqSource struct {
	Multiaddr  [4]byte
	Sourceaddr [4]byte
	Interface  [4]byte
}

// See http://msdn.microsoft.com/en-us/library/windows/desktop/ms738586(v=vs.85).aspx
var (
	ctlOpts = [ctlMax]ctlOpt{}

	sockOpts = map[int]*sockOpt{
		ssoTOS:                {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}},
		ssoTTL:                {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}},
		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 4}},
		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: 4}},
		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}},
		ssoHeaderPrepend:      {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}},
		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_ADD_MEMBERSHIP, Len: sizeofIPMreq}, typ: ssoTypeIPMreq},
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