control_rfc2292_unix.go

Documentation: golang.org/x/net/ipv6

     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
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