github.com/lianghucheng/zrddz@v0.0.0-20200923083010-c71f680932e2/src/golang.org/x/net/ipv4/sys_windows.go (about)

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package ipv4
     6  
     7  import (
     8  	"golang.org/x/net/internal/iana"
     9  	"golang.org/x/net/internal/socket"
    10  )
    11  
    12  const (
    13  	// See ws2tcpip.h.
    14  	sysIP_OPTIONS                = 0x1
    15  	sysIP_HDRINCL                = 0x2
    16  	sysIP_TOS                    = 0x3
    17  	sysIP_TTL                    = 0x4
    18  	sysIP_MULTICAST_IF           = 0x9
    19  	sysIP_MULTICAST_TTL          = 0xa
    20  	sysIP_MULTICAST_LOOP         = 0xb
    21  	sysIP_ADD_MEMBERSHIP         = 0xc
    22  	sysIP_DROP_MEMBERSHIP        = 0xd
    23  	sysIP_DONTFRAGMENT           = 0xe
    24  	sysIP_ADD_SOURCE_MEMBERSHIP  = 0xf
    25  	sysIP_DROP_SOURCE_MEMBERSHIP = 0x10
    26  	sysIP_PKTINFO                = 0x13
    27  
    28  	sizeofInetPktinfo  = 0x8
    29  	sizeofIPMreq       = 0x8
    30  	sizeofIPMreqSource = 0xc
    31  )
    32  
    33  type inetPktinfo struct {
    34  	Addr    [4]byte
    35  	Ifindex int32
    36  }
    37  
    38  type ipMreq struct {
    39  	Multiaddr [4]byte
    40  	Interface [4]byte
    41  }
    42  
    43  type ipMreqSource struct {
    44  	Multiaddr  [4]byte
    45  	Sourceaddr [4]byte
    46  	Interface  [4]byte
    47  }
    48  
    49  // See http://msdn.microsoft.com/en-us/library/windows/desktop/ms738586(v=vs.85).aspx
    50  var (
    51  	ctlOpts = [ctlMax]ctlOpt{}
    52  
    53  	sockOpts = map[int]*sockOpt{
    54  		ssoTOS:                {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}},
    55  		ssoTTL:                {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}},
    56  		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 4}},
    57  		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: 4}},
    58  		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}},
    59  		ssoHeaderPrepend:      {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}},
    60  		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_ADD_MEMBERSHIP, Len: sizeofIPMreq}, typ: ssoTypeIPMreq},
    61  		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_DROP_MEMBERSHIP, Len: sizeofIPMreq}, typ: ssoTypeIPMreq},
    62  	}
    63  )
    64  
    65  func (pi *inetPktinfo) setIfindex(i int) {
    66  	pi.Ifindex = int32(i)
    67  }