sys_dragonfly.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 (
   8  	"syscall"
   9  	"unsafe"
  10  )
  11  
  12  // MTU returns the interface MTU.
  13  func (m *InterfaceMessage) MTU() int {
  14  	return int(nativeEndian.Uint32(m.raw[m.extOff+8 : m.extOff+12]))
  15  }
  16  
  17  func probeRoutingStack() (int, map[int]*wireFormat) {
  18  	var p uintptr
  19  	ifm := &wireFormat{extOff: 16, bodyOff: syscall.SizeofIfMsghdr}
  20  	ifm.parse = ifm.parseInterfaceMessage
  21  	ifam := &wireFormat{extOff: syscall.SizeofIfaMsghdr, bodyOff: syscall.SizeofIfaMsghdr}
  22  	ifam.parse = ifam.parseInterfaceAddrMessage
  23  	ifmam := &wireFormat{extOff: syscall.SizeofIfmaMsghdr, bodyOff: syscall.SizeofIfmaMsghdr}
  24  	ifmam.parse = ifmam.parseInterfaceMulticastAddrMessage
  25  
  26  	rel, _ := syscall.SysctlUint32("kern.osreldate")
  27  	if rel >= 500705 {
  28  		// https://github.com/DragonFlyBSD/DragonFlyBSD/commit/43a373152df2d405c9940983e584e6a25e76632d
  29  		// but only the size of struct ifa_msghdr actually changed
  30  		rtmVersion = 7
  31  		ifam.bodyOff = 0x18
  32  	}
  33  
  34  	return int(unsafe.Sizeof(p)), map[int]*wireFormat{
  35  		syscall.RTM_NEWADDR:  ifam,
  36  		syscall.RTM_DELADDR:  ifam,
  37  		syscall.RTM_IFINFO:   ifm,
  38  		syscall.RTM_NEWMADDR: ifmam,
  39  		syscall.RTM_DELMADDR: ifmam,
  40  	}
  41  }
  42