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
7import (
8	"syscall"
9	"unsafe"
10)
11
12func (typ RIBType) parseable() bool { return true }
13
14// RouteMetrics represents route metrics.
15type RouteMetrics struct {
16	PathMTU int // path maximum transmission unit
17}
18
19// SysType implements the SysType method of Sys interface.
20func (rmx *RouteMetrics) SysType() SysType { return SysMetrics }
21
22// Sys implements the Sys method of Message interface.
23func (m *RouteMessage) Sys() []Sys {
24	return []Sys{
25		&RouteMetrics{
26			PathMTU: int(nativeEndian.Uint64(m.raw[m.extOff+8 : m.extOff+16])),
27		},
28	}
29}
30
31// InterfaceMetrics represents interface metrics.
32type InterfaceMetrics struct {
33	Type int // interface type
34	MTU  int // maximum transmission unit
35}
36
37// SysType implements the SysType method of Sys interface.
38func (imx *InterfaceMetrics) SysType() SysType { return SysMetrics }
39
40// Sys implements the Sys method of Message interface.
41func (m *InterfaceMessage) Sys() []Sys {
42	return []Sys{
43		&InterfaceMetrics{
44			Type: int(m.raw[m.extOff]),
45			MTU:  int(nativeEndian.Uint32(m.raw[m.extOff+8 : m.extOff+12])),
46		},
47	}
48}
49
50func probeRoutingStack() (int, map[int]*wireFormat) {
51	var p uintptr
52	rtm := &wireFormat{extOff: 40, bodyOff: sizeofRtMsghdrDragonFlyBSD4}
53	rtm.parse = rtm.parseRouteMessage
54	ifm := &wireFormat{extOff: 16, bodyOff: sizeofIfMsghdrDragonFlyBSD4}
55	ifm.parse = ifm.parseInterfaceMessage
56	ifam := &wireFormat{extOff: sizeofIfaMsghdrDragonFlyBSD4, bodyOff: sizeofIfaMsghdrDragonFlyBSD4}
57	ifam.parse = ifam.parseInterfaceAddrMessage
58	ifmam := &wireFormat{extOff: sizeofIfmaMsghdrDragonFlyBSD4, bodyOff: sizeofIfmaMsghdrDragonFlyBSD4}
59	ifmam.parse = ifmam.parseInterfaceMulticastAddrMessage
60	ifanm := &wireFormat{extOff: sizeofIfAnnouncemsghdrDragonFlyBSD4, bodyOff: sizeofIfAnnouncemsghdrDragonFlyBSD4}
61	ifanm.parse = ifanm.parseInterfaceAnnounceMessage
62
63	rel, _ := syscall.SysctlUint32("kern.osreldate")
64	if rel >= 500705 {
65		// https://github.com/DragonFlyBSD/DragonFlyBSD/commit/43a373152df2d405c9940983e584e6a25e76632d
66		// but only the size of struct ifa_msghdr actually changed
67		rtmVersion = 7
68		ifam.bodyOff = sizeofIfaMsghdrDragonFlyBSD58
69	}
70
71	return int(unsafe.Sizeof(p)), map[int]*wireFormat{
72		sysRTM_ADD:        rtm,
73		sysRTM_DELETE:     rtm,
74		sysRTM_CHANGE:     rtm,
75		sysRTM_GET:        rtm,
76		sysRTM_LOSING:     rtm,
77		sysRTM_REDIRECT:   rtm,
78		sysRTM_MISS:       rtm,
79		sysRTM_LOCK:       rtm,
80		sysRTM_RESOLVE:    rtm,
81		sysRTM_NEWADDR:    ifam,
82		sysRTM_DELADDR:    ifam,
83		sysRTM_IFINFO:     ifm,
84		sysRTM_NEWMADDR:   ifmam,
85		sysRTM_DELMADDR:   ifmam,
86		sysRTM_IFANNOUNCE: ifanm,
87	}
88}
89