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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package route
import (
"syscall"
"unsafe"
)
func (typ RIBType) parseable() bool { return true }
// RouteMetrics represents route metrics.
type RouteMetrics struct {
PathMTU int // path maximum transmission unit
}
// SysType implements the SysType method of Sys interface.
func (rmx *RouteMetrics) SysType() SysType { return SysMetrics }
// Sys implements the Sys method of Message interface.
func (m *RouteMessage) Sys() []Sys {
if kernelAlign == 8 {
return []Sys{
&RouteMetrics{
PathMTU: int(nativeEndian.Uint64(m.raw[m.extOff+8 : m.extOff+16])),
},
}
}
return []Sys{
&RouteMetrics{
PathMTU: int(nativeEndian.Uint32(m.raw[m.extOff+4 : m.extOff+8])),
},
}
}
// InterfaceMetrics represents interface metrics.
type InterfaceMetrics struct {
Type int // interface type
MTU int // maximum transmission unit
}
// SysType implements the SysType method of Sys interface.
func (imx *InterfaceMetrics) SysType() SysType { return SysMetrics }
// Sys implements the Sys method of Message interface.
func (m *InterfaceMessage) Sys() []Sys {
return []Sys{
&InterfaceMetrics{
Type: int(m.raw[m.extOff]),
MTU: int(nativeEndian.Uint32(m.raw[m.extOff+8 : m.extOff+12])),
},
}
}
func probeRoutingStack() (int, map[int]*wireFormat) {
var p uintptr
wordSize := int(unsafe.Sizeof(p))
align := int(unsafe.Sizeof(p))
// In the case of kern.supported_archs="amd64 i386", we need
// to know the underlying kernel's architecture because the
// alignment for routing facilities are set at the build time
// of the kernel.
conf, _ := syscall.Sysctl("kern.conftxt")
for i, j := 0, 0; j < len(conf); j++ {
if conf[j] != '\n' {
continue
}
s := conf[i:j]
i = j + 1
if len(s) > len("machine") && s[:len("machine")] == "machine" {
s = s[len("machine"):]
for k := 0; k < len(s); k++ {
if s[k] == ' ' || s[k] == '\t' {
s = s[1:]
}
break
}
if s == "amd64" {
align = 8
}
break
}
}
var rtm, ifm, ifam, ifmam, ifanm *wireFormat
if align != wordSize { // 386 emulation on amd64
rtm = &wireFormat{extOff: sizeofRtMsghdrFreeBSD10Emu - sizeofRtMetricsFreeBSD10Emu, bodyOff: sizeofRtMsghdrFreeBSD10Emu}
ifm = &wireFormat{extOff: 16}
ifam = &wireFormat{extOff: sizeofIfaMsghdrFreeBSD10Emu, bodyOff: sizeofIfaMsghdrFreeBSD10Emu}
ifmam = &wireFormat{extOff: sizeofIfmaMsghdrFreeBSD10Emu, bodyOff: sizeofIfmaMsghdrFreeBSD10Emu}
ifanm = &wireFormat{extOff: sizeofIfAnnouncemsghdrFreeBSD10Emu, bodyOff: sizeofIfAnnouncemsghdrFreeBSD10Emu}
} else {
rtm = &wireFormat{extOff: sizeofRtMsghdrFreeBSD10 - sizeofRtMetricsFreeBSD10, bodyOff: sizeofRtMsghdrFreeBSD10}
ifm = &wireFormat{extOff: 16}
ifam = &wireFormat{extOff: sizeofIfaMsghdrFreeBSD10, bodyOff: sizeofIfaMsghdrFreeBSD10}
ifmam = &wireFormat{extOff: sizeofIfmaMsghdrFreeBSD10, bodyOff: sizeofIfmaMsghdrFreeBSD10}
ifanm = &wireFormat{extOff: sizeofIfAnnouncemsghdrFreeBSD10, bodyOff: sizeofIfAnnouncemsghdrFreeBSD10}
}
rel, _ := syscall.SysctlUint32("kern.osreldate")
switch {
case rel < 800000:
if align != wordSize { // 386 emulation on amd64
ifm.bodyOff = sizeofIfMsghdrFreeBSD7Emu
} else {
ifm.bodyOff = sizeofIfMsghdrFreeBSD7
}
case 800000 <= rel && rel < 900000:
if align != wordSize { // 386 emulation on amd64
ifm.bodyOff = sizeofIfMsghdrFreeBSD8Emu
} else {
ifm.bodyOff = sizeofIfMsghdrFreeBSD8
}
case 900000 <= rel && rel < 1000000:
if align != wordSize { // 386 emulation on amd64
ifm.bodyOff = sizeofIfMsghdrFreeBSD9Emu
} else {
ifm.bodyOff = sizeofIfMsghdrFreeBSD9
}
case 1000000 <= rel && rel < 1100000:
if align != wordSize { // 386 emulation on amd64
ifm.bodyOff = sizeofIfMsghdrFreeBSD10Emu
} else {
ifm.bodyOff = sizeofIfMsghdrFreeBSD10
}
default:
if align != wordSize { // 386 emulation on amd64
ifm.bodyOff = sizeofIfMsghdrFreeBSD11Emu
} else {
ifm.bodyOff = sizeofIfMsghdrFreeBSD11
}
}
rtm.parse = rtm.parseRouteMessage
ifm.parse = ifm.parseInterfaceMessage
ifam.parse = ifam.parseInterfaceAddrMessage
ifmam.parse = ifmam.parseInterfaceMulticastAddrMessage
ifanm.parse = ifanm.parseInterfaceAnnounceMessage
return align, map[int]*wireFormat{
sysRTM_ADD: rtm,
sysRTM_DELETE: rtm,
sysRTM_CHANGE: rtm,
sysRTM_GET: rtm,
sysRTM_LOSING: rtm,
sysRTM_REDIRECT: rtm,
sysRTM_MISS: rtm,
sysRTM_LOCK: rtm,
sysRTM_RESOLVE: rtm,
sysRTM_NEWADDR: ifam,
sysRTM_DELADDR: ifam,
sysRTM_IFINFO: ifm,
sysRTM_NEWMADDR: ifmam,
sysRTM_DELMADDR: ifmam,
sysRTM_IFANNOUNCE: ifanm,
}
}
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