sys_darwin.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  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