interface_classic.go

     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 route
     8  
     9  import (
    10  	"runtime"
    11  	"syscall"
    12  )
    13  
    14  func (w *wireFormat) parseInterfaceMessage(_ RIBType, 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  	if attrs&syscall.RTA_IFP == 0 {
    24  		return nil, nil
    25  	}
    26  	m := &InterfaceMessage{
    27  		Version: int(b[2]),
    28  		Type:    int(b[3]),
    29  		Addrs:   make([]Addr, syscall.RTAX_MAX),
    30  		Flags:   int(nativeEndian.Uint32(b[8:12])),
    31  		Index:   int(nativeEndian.Uint16(b[12:14])),
    32  		extOff:  w.extOff,
    33  		raw:     b[:l],
    34  	}
    35  	a, err := parseLinkAddr(b[w.bodyOff:])
    36  	if err != nil {
    37  		return nil, err
    38  	}
    39  	m.Addrs[syscall.RTAX_IFP] = a
    40  	m.Name = a.(*LinkAddr).Name
    41  	return m, nil
    42  }
    43  
    44  func (w *wireFormat) parseInterfaceAddrMessage(_ RIBType, b []byte) (Message, error) {
    45  	if len(b) < w.bodyOff {
    46  		return nil, errMessageTooShort
    47  	}
    48  	l := int(nativeEndian.Uint16(b[:2]))
    49  	if len(b) < l {
    50  		return nil, errInvalidMessage
    51  	}
    52  	m := &InterfaceAddrMessage{
    53  		Version: int(b[2]),
    54  		Type:    int(b[3]),
    55  		Flags:   int(nativeEndian.Uint32(b[8:12])),
    56  		raw:     b[:l],
    57  	}
    58  	if runtime.GOOS == "netbsd" {
    59  		m.Index = int(nativeEndian.Uint16(b[16:18]))
    60  	} else {
    61  		m.Index = int(nativeEndian.Uint16(b[12:14]))
    62  	}
    63  	var err error
    64  	m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[4:8])), parseKernelInetAddr, b[w.bodyOff:])
    65  	if err != nil {
    66  		return nil, err
    67  	}
    68  	return m, nil
    69  }
    70
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