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

     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  // +build darwin dragonfly netbsd
     6  
     7  package route
     8  
     9  import "runtime"
    10  
    11  func (w *wireFormat) parseInterfaceMessage(_ RIBType, b []byte) (Message, error) {
    12  	if len(b) < w.bodyOff {
    13  		return nil, errMessageTooShort
    14  	}
    15  	l := int(nativeEndian.Uint16(b[:2]))
    16  	if len(b) < l {
    17  		return nil, errInvalidMessage
    18  	}
    19  	attrs := uint(nativeEndian.Uint32(b[4:8]))
    20  	if attrs&sysRTA_IFP == 0 {
    21  		return nil, nil
    22  	}
    23  	m := &InterfaceMessage{
    24  		Version: int(b[2]),
    25  		Type:    int(b[3]),
    26  		Addrs:   make([]Addr, sysRTAX_MAX),
    27  		Flags:   int(nativeEndian.Uint32(b[8:12])),
    28  		Index:   int(nativeEndian.Uint16(b[12:14])),
    29  		extOff:  w.extOff,
    30  		raw:     b[:l],
    31  	}
    32  	a, err := parseLinkAddr(b[w.bodyOff:])
    33  	if err != nil {
    34  		return nil, err
    35  	}
    36  	m.Addrs[sysRTAX_IFP] = a
    37  	m.Name = a.(*LinkAddr).Name
    38  	return m, nil
    39  }
    40  
    41  func (w *wireFormat) parseInterfaceAddrMessage(_ RIBType, b []byte) (Message, error) {
    42  	if len(b) < w.bodyOff {
    43  		return nil, errMessageTooShort
    44  	}
    45  	l := int(nativeEndian.Uint16(b[:2]))
    46  	if len(b) < l {
    47  		return nil, errInvalidMessage
    48  	}
    49  	m := &InterfaceAddrMessage{
    50  		Version: int(b[2]),
    51  		Type:    int(b[3]),
    52  		Flags:   int(nativeEndian.Uint32(b[8:12])),
    53  		raw:     b[:l],
    54  	}
    55  	if runtime.GOOS == "netbsd" {
    56  		m.Index = int(nativeEndian.Uint16(b[16:18]))
    57  	} else {
    58  		m.Index = int(nativeEndian.Uint16(b[12:14]))
    59  	}
    60  	var err error
    61  	m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[4:8])), parseKernelInetAddr, b[w.bodyOff:])
    62  	if err != nil {
    63  		return nil, err
    64  	}
    65  	return m, nil
    66  }