interface_classic.mx raw

   1  // Copyright 2016 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 || dragonfly || netbsd
   6  
   7  package routebsd
   8  
   9  import (
  10  	"runtime"
  11  	"syscall"
  12  )
  13  
  14  func (w *wireFormat) parseInterfaceMessage(b []byte) (Message, error) {
  15  	if len(b) < w.bodyOff {
  16  		return nil, errMessageTooShort
  17  	}
  18  	l := int(nativeEndian.Uint16(b[:2]))
  19  	if len(b) < l {
  20  		return nil, errInvalidMessage
  21  	}
  22  	attrs := uint(nativeEndian.Uint32(b[4:8]))
  23  
  24  	m := &InterfaceMessage{
  25  		Version: int(b[2]),
  26  		Type:    int(b[3]),
  27  		Addrs:   []Addr{:syscall.RTAX_MAX},
  28  		Flags:   int(nativeEndian.Uint32(b[8:12])),
  29  		Index:   int(nativeEndian.Uint16(b[12:14])),
  30  		extOff:  w.extOff,
  31  		raw:     b[:l],
  32  	}
  33  
  34  	// We used to require that RTA_IFP always be set.
  35  	// It turns out that on darwin messages about the
  36  	// utun interface may not include a name. Issue #71064.
  37  	if attrs&syscall.RTA_IFP != 0 {
  38  		a, err := parseLinkAddr(b[w.bodyOff:])
  39  		if err != nil {
  40  			return nil, err
  41  		}
  42  		m.Addrs[syscall.RTAX_IFP] = a
  43  		m.Name = a.(*LinkAddr).Name
  44  	} else {
  45  		// DragonFly seems to have unnamed interfaces
  46  		// that we can't look up again. Just skip them.
  47  		if runtime.GOOS == "dragonfly" {
  48  			return nil, nil
  49  		}
  50  	}
  51  
  52  	return m, nil
  53  }
  54  
  55  func (w *wireFormat) parseInterfaceAddrMessage(b []byte) (Message, error) {
  56  	if len(b) < w.bodyOff {
  57  		return nil, errMessageTooShort
  58  	}
  59  	l := int(nativeEndian.Uint16(b[:2]))
  60  	if len(b) < l {
  61  		return nil, errInvalidMessage
  62  	}
  63  	m := &InterfaceAddrMessage{
  64  		Version: int(b[2]),
  65  		Type:    int(b[3]),
  66  		Flags:   int(nativeEndian.Uint32(b[8:12])),
  67  		raw:     b[:l],
  68  	}
  69  	if runtime.GOOS == "netbsd" {
  70  		m.Index = int(nativeEndian.Uint16(b[16:18]))
  71  	} else {
  72  		m.Index = int(nativeEndian.Uint16(b[12:14]))
  73  	}
  74  	var err error
  75  	m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[4:8])), b[w.bodyOff:])
  76  	if err != nil {
  77  		return nil, err
  78  	}
  79  	return m, nil
  80  }
  81