sys_darwin.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  package routebsd
     6  
     7  import "syscall"
     8  
     9  // MTU returns the interface MTU.
    10  func (m *InterfaceMessage) MTU() int {
    11  	return int(nativeEndian.Uint32(m.raw[m.extOff+8 : m.extOff+12]))
    12  }
    13  
    14  // sizeofIfMsghdr2 is copied from x/sys/unix.
    15  const sizeofIfMsghdr2 = 0xa0
    16  
    17  func probeRoutingStack() (int, map[int]*wireFormat) {
    18  	ifm := &wireFormat{extOff: 16, bodyOff: syscall.SizeofIfMsghdr}
    19  	ifm.parse = ifm.parseInterfaceMessage
    20  	ifm2 := &wireFormat{extOff: 32, bodyOff: sizeofIfMsghdr2}
    21  	ifm2.parse = ifm2.parseInterfaceMessage
    22  	ifam := &wireFormat{extOff: syscall.SizeofIfaMsghdr, bodyOff: syscall.SizeofIfaMsghdr}
    23  	ifam.parse = ifam.parseInterfaceAddrMessage
    24  	ifmam := &wireFormat{extOff: syscall.SizeofIfmaMsghdr, bodyOff: syscall.SizeofIfmaMsghdr}
    25  	ifmam.parse = ifmam.parseInterfaceMulticastAddrMessage
    26  	ifmam2 := &wireFormat{extOff: syscall.SizeofIfmaMsghdr2, bodyOff: syscall.SizeofIfmaMsghdr2}
    27  	ifmam2.parse = ifmam2.parseInterfaceMulticastAddrMessage
    28  	// Darwin kernels require 32-bit aligned access to routing facilities.
    29  	return 4, map[int]*wireFormat{
    30  		syscall.RTM_NEWADDR:   ifam,
    31  		syscall.RTM_DELADDR:   ifam,
    32  		syscall.RTM_IFINFO:    ifm,
    33  		syscall.RTM_NEWMADDR:  ifmam,
    34  		syscall.RTM_DELMADDR:  ifmam,
    35  		syscall.RTM_IFINFO2:   ifm2,
    36  		syscall.RTM_NEWMADDR2: ifmam2,
    37  	}
    38  }
    39
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