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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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