sys_darwin.go raw

   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  	"net"
   9  	"syscall"
  10  	"unsafe"
  11  
  12  	"golang.org/x/net/internal/iana"
  13  	"golang.org/x/net/internal/socket"
  14  
  15  	"golang.org/x/sys/unix"
  16  )
  17  
  18  const sockoptReceiveInterface = unix.IP_RECVIF
  19  
  20  var (
  21  	ctlOpts = [ctlMax]ctlOpt{
  22  		ctlTTL:        {unix.IP_RECVTTL, 1, marshalTTL, parseTTL},
  23  		ctlDst:        {unix.IP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst},
  24  		ctlInterface:  {unix.IP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface},
  25  		ctlPacketInfo: {unix.IP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
  26  	}
  27  
  28  	sockOpts = map[int]*sockOpt{
  29  		ssoTOS:                {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TOS, Len: 4}},
  30  		ssoTTL:                {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TTL, Len: 4}},
  31  		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 1}},
  32  		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: unix.SizeofIPMreqn}, typ: ssoTypeIPMreqn},
  33  		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 4}},
  34  		ssoReceiveTTL:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVTTL, Len: 4}},
  35  		ssoReceiveDst:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVDSTADDR, Len: 4}},
  36  		ssoReceiveInterface:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVIF, Len: 4}},
  37  		ssoHeaderPrepend:      {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_HDRINCL, Len: 4}},
  38  		ssoStripHeader:        {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_STRIPHDR, Len: 4}},
  39  		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
  40  		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
  41  		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  42  		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  43  		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  44  		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
  45  		ssoPacketInfo:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVPKTINFO, Len: 4}},
  46  	}
  47  )
  48  
  49  func (pi *inetPktinfo) setIfindex(i int) {
  50  	pi.Ifindex = uint32(i)
  51  }
  52  
  53  func (gr *groupReq) setGroup(grp net.IP) {
  54  	sa := (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gr)) + 4))
  55  	sa.Len = sizeofSockaddrInet
  56  	sa.Family = syscall.AF_INET
  57  	copy(sa.Addr[:], grp)
  58  }
  59  
  60  func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
  61  	sa := (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 4))
  62  	sa.Len = sizeofSockaddrInet
  63  	sa.Family = syscall.AF_INET
  64  	copy(sa.Addr[:], grp)
  65  	sa = (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 132))
  66  	sa.Len = sizeofSockaddrInet
  67  	sa.Family = syscall.AF_INET
  68  	copy(sa.Addr[:], src)
  69  }
  70