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
5package route
6
7func (typ RIBType) parseable() bool { return true }
8
9// RouteMetrics represents route metrics.
10type RouteMetrics struct {
11	PathMTU int // path maximum transmission unit
12}
13
14// SysType implements the SysType method of Sys interface.
15func (rmx *RouteMetrics) SysType() SysType { return SysMetrics }
16
17// Sys implements the Sys method of Message interface.
18func (m *RouteMessage) Sys() []Sys {
19	return []Sys{
20		&RouteMetrics{
21			PathMTU: int(nativeEndian.Uint64(m.raw[m.extOff+8 : m.extOff+16])),
22		},
23	}
24}
25
26// RouteMetrics represents route metrics.
27type InterfaceMetrics struct {
28	Type int // interface type
29	MTU  int // maximum transmission unit
30}
31
32// SysType implements the SysType method of Sys interface.
33func (imx *InterfaceMetrics) SysType() SysType { return SysMetrics }
34
35// Sys implements the Sys method of Message interface.
36func (m *InterfaceMessage) Sys() []Sys {
37	return []Sys{
38		&InterfaceMetrics{
39			Type: int(m.raw[m.extOff]),
40			MTU:  int(nativeEndian.Uint32(m.raw[m.extOff+8 : m.extOff+12])),
41		},
42	}
43}
44
45func probeRoutingStack() (int, map[int]*wireFormat) {
46	rtm := &wireFormat{extOff: 40, bodyOff: sizeofRtMsghdrNetBSD7}
47	rtm.parse = rtm.parseRouteMessage
48	ifm := &wireFormat{extOff: 16, bodyOff: sizeofIfMsghdrNetBSD7}
49	ifm.parse = ifm.parseInterfaceMessage
50	ifam := &wireFormat{extOff: sizeofIfaMsghdrNetBSD7, bodyOff: sizeofIfaMsghdrNetBSD7}
51	ifam.parse = ifam.parseInterfaceAddrMessage
52	ifanm := &wireFormat{extOff: sizeofIfAnnouncemsghdrNetBSD7, bodyOff: sizeofIfAnnouncemsghdrNetBSD7}
53	ifanm.parse = ifanm.parseInterfaceAnnounceMessage
54	// NetBSD 6 and above kernels require 64-bit aligned access to
55	// routing facilities.
56	return 8, map[int]*wireFormat{
57		sysRTM_ADD:        rtm,
58		sysRTM_DELETE:     rtm,
59		sysRTM_CHANGE:     rtm,
60		sysRTM_GET:        rtm,
61		sysRTM_LOSING:     rtm,
62		sysRTM_REDIRECT:   rtm,
63		sysRTM_MISS:       rtm,
64		sysRTM_LOCK:       rtm,
65		sysRTM_RESOLVE:    rtm,
66		sysRTM_NEWADDR:    ifam,
67		sysRTM_DELADDR:    ifam,
68		sysRTM_IFANNOUNCE: ifanm,
69		sysRTM_IFINFO:     ifm,
70	}
71}
72