control_rfc2292_unix.go raw

   1  // Copyright 2013 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  //go:build darwin
   6  
   7  package ipv6
   8  
   9  import (
  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  func marshal2292HopLimit(b []byte, cm *ControlMessage) []byte {
  19  	m := socket.ControlMessage(b)
  20  	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_2292HOPLIMIT, 4)
  21  	if cm != nil {
  22  		socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.HopLimit))
  23  	}
  24  	return m.Next(4)
  25  }
  26  
  27  func marshal2292PacketInfo(b []byte, cm *ControlMessage) []byte {
  28  	m := socket.ControlMessage(b)
  29  	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_2292PKTINFO, sizeofInet6Pktinfo)
  30  	if cm != nil {
  31  		pi := (*inet6Pktinfo)(unsafe.Pointer(&m.Data(sizeofInet6Pktinfo)[0]))
  32  		if ip := cm.Src.To16(); ip != nil && ip.To4() == nil {
  33  			copy(pi.Addr[:], ip)
  34  		}
  35  		if cm.IfIndex > 0 {
  36  			pi.setIfindex(cm.IfIndex)
  37  		}
  38  	}
  39  	return m.Next(sizeofInet6Pktinfo)
  40  }
  41  
  42  func marshal2292NextHop(b []byte, cm *ControlMessage) []byte {
  43  	m := socket.ControlMessage(b)
  44  	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_2292NEXTHOP, sizeofSockaddrInet6)
  45  	if cm != nil {
  46  		sa := (*sockaddrInet6)(unsafe.Pointer(&m.Data(sizeofSockaddrInet6)[0]))
  47  		sa.setSockaddr(cm.NextHop, cm.IfIndex)
  48  	}
  49  	return m.Next(sizeofSockaddrInet6)
  50  }
  51