github.com/Andyfoo/golang/x/net@v0.0.0-20190901054642-57c1bf301704/ipv6/control_rfc3542_unix.go (about)

     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  // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
     6  
     7  package ipv6
     8  
     9  import (
    10  	"net"
    11  	"unsafe"
    12  
    13  	"github.com/Andyfoo/golang/x/net/internal/iana"
    14  	"github.com/Andyfoo/golang/x/net/internal/socket"
    15  )
    16  
    17  func marshalTrafficClass(b []byte, cm *ControlMessage) []byte {
    18  	m := socket.ControlMessage(b)
    19  	m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_TCLASS, 4)
    20  	if cm != nil {
    21  		socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.TrafficClass))
    22  	}
    23  	return m.Next(4)
    24  }
    25  
    26  func parseTrafficClass(cm *ControlMessage, b []byte) {
    27  	cm.TrafficClass = int(socket.NativeEndian.Uint32(b[:4]))
    28  }
    29  
    30  func marshalHopLimit(b []byte, cm *ControlMessage) []byte {
    31  	m := socket.ControlMessage(b)
    32  	m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_HOPLIMIT, 4)
    33  	if cm != nil {
    34  		socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.HopLimit))
    35  	}
    36  	return m.Next(4)
    37  }
    38  
    39  func parseHopLimit(cm *ControlMessage, b []byte) {
    40  	cm.HopLimit = int(socket.NativeEndian.Uint32(b[:4]))
    41  }
    42  
    43  func marshalPacketInfo(b []byte, cm *ControlMessage) []byte {
    44  	m := socket.ControlMessage(b)
    45  	m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_PKTINFO, sizeofInet6Pktinfo)
    46  	if cm != nil {
    47  		pi := (*inet6Pktinfo)(unsafe.Pointer(&m.Data(sizeofInet6Pktinfo)[0]))
    48  		if ip := cm.Src.To16(); ip != nil && ip.To4() == nil {
    49  			copy(pi.Addr[:], ip)
    50  		}
    51  		if cm.IfIndex > 0 {
    52  			pi.setIfindex(cm.IfIndex)
    53  		}
    54  	}
    55  	return m.Next(sizeofInet6Pktinfo)
    56  }
    57  
    58  func parsePacketInfo(cm *ControlMessage, b []byte) {
    59  	pi := (*inet6Pktinfo)(unsafe.Pointer(&b[0]))
    60  	if len(cm.Dst) < net.IPv6len {
    61  		cm.Dst = make(net.IP, net.IPv6len)
    62  	}
    63  	copy(cm.Dst, pi.Addr[:])
    64  	cm.IfIndex = int(pi.Ifindex)
    65  }
    66  
    67  func marshalNextHop(b []byte, cm *ControlMessage) []byte {
    68  	m := socket.ControlMessage(b)
    69  	m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_NEXTHOP, sizeofSockaddrInet6)
    70  	if cm != nil {
    71  		sa := (*sockaddrInet6)(unsafe.Pointer(&m.Data(sizeofSockaddrInet6)[0]))
    72  		sa.setSockaddr(cm.NextHop, cm.IfIndex)
    73  	}
    74  	return m.Next(sizeofSockaddrInet6)
    75  }
    76  
    77  func parseNextHop(cm *ControlMessage, b []byte) {
    78  }
    79  
    80  func marshalPathMTU(b []byte, cm *ControlMessage) []byte {
    81  	m := socket.ControlMessage(b)
    82  	m.MarshalHeader(iana.ProtocolIPv6, sysIPV6_PATHMTU, sizeofIPv6Mtuinfo)
    83  	return m.Next(sizeofIPv6Mtuinfo)
    84  }
    85  
    86  func parsePathMTU(cm *ControlMessage, b []byte) {
    87  	mi := (*ipv6Mtuinfo)(unsafe.Pointer(&b[0]))
    88  	if len(cm.Dst) < net.IPv6len {
    89  		cm.Dst = make(net.IP, net.IPv6len)
    90  	}
    91  	copy(cm.Dst, mi.Addr.Addr[:])
    92  	cm.IfIndex = int(mi.Addr.Scope_id)
    93  	cm.MTU = int(mi.Mtu)
    94  }