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fib.go
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fib.go
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// Copyright © 2018-2020 Platina Systems, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xeth
import (
"bytes"
"net"
"sync"
"unsafe"
"github.com/platinasystems/goes/external/xeth/internal"
)
type FibEntryEvent uint8
type RtScope uint8
type RtTable uint32
type Rtn uint8
type RtnhFlags uint32
type FibEntry struct {
net.IPNet
NHs []*NH
NetNs
RtTable
FibEntryEvent
Rtn
Tos uint8
Ref
}
type NH struct {
net.IP
Xid
Ifindex int32
Weight int32
RtnhFlags
RtScope
}
const (
CompatRtTable = RtTable(RT_TABLE_COMPAT)
DefaultRtTable = RtTable(RT_TABLE_DEFAULT)
MainRtTable = RtTable(RT_TABLE_MAIN)
LocalRtTable = RtTable(RT_TABLE_LOCAL)
)
var poolFibEntry = sync.Pool{
New: func() interface{} {
return &FibEntry{
IPNet: net.IPNet{
IP: make([]byte, net.IPv6len, net.IPv6len),
Mask: make([]byte, net.IPv6len, net.IPv6len),
},
}
},
}
var poolNH = sync.Pool{
New: func() interface{} {
return &NH{
IP: make([]byte, net.IPv6len, net.IPv6len),
}
},
}
func newFibEntry() *FibEntry {
fe := poolFibEntry.Get().(*FibEntry)
fe.Hold()
return fe
}
func newNH() *NH {
return poolNH.Get().(*NH)
}
func (fe *FibEntry) Pool() {
if fe.Release() > 0 {
return
}
for _, nh := range fe.NHs {
nh.Pool()
}
fe.NHs = fe.NHs[:0]
fe.IPNet.IP = fe.IPNet.IP[:net.IPv6len]
fe.IPNet.Mask = fe.IPNet.Mask[:net.IPv6len]
poolFibEntry.Put(fe)
}
func (nh *NH) Pool() {
nh.IP = nh.IP[:net.IPv6len]
poolNH.Put(nh)
}
// to sort a list of fib entries,
// sort.Slice(fib, func(i, j int) bool {
// return fib[i].Less(fib[j])
// })
func (feI *FibEntry) Less(feJ *FibEntry) bool {
if feI.NetNs != feJ.NetNs {
return feI.NetNs < feJ.NetNs
}
if feI.RtTable != feJ.RtTable {
return feI.RtTable < feJ.RtTable
}
switch bytes.Compare(feI.IPNet.IP, feJ.IPNet.IP) {
case 0:
onesI, _ := feI.IPNet.Mask.Size()
onesJ, _ := feJ.IPNet.Mask.Size()
return onesI < onesJ
case -1:
return true
case 1:
return false
}
return false
}
func fib4(msg *internal.MsgFibEntry) *FibEntry {
fe := newFibEntry()
fe.NetNs = NetNs(msg.Net)
*(*uint32)(unsafe.Pointer(&fe.IPNet.IP[0])) = msg.Address
*(*uint32)(unsafe.Pointer(&fe.IPNet.Mask[0])) = msg.Mask
fe.IPNet.IP = fe.IPNet.IP[:net.IPv4len]
fe.IPNet.Mask = fe.IPNet.Mask[:net.IPv4len]
fe.FibEntryEvent = FibEntryEvent(msg.Event)
fe.Rtn = Rtn(msg.Type)
fe.RtTable = RtTable(msg.Table)
fe.Tos = msg.Tos
for _, nh := range msg.NextHops() {
xid := fe.NetNs.Xid(nh.Ifindex)
fenh := newNH()
*(*uint32)(unsafe.Pointer(&fenh.IP[0])) = nh.Gw
fenh.IP = fenh.IP[:net.IPv4len]
fenh.Xid = xid
fenh.Ifindex = nh.Ifindex
fenh.Weight = nh.Weight
fenh.RtnhFlags = RtnhFlags(nh.Flags)
fenh.RtScope = RtScope(nh.Scope)
fe.NHs = append(fe.NHs, fenh)
}
fe.NetNs.fibentry(fe)
return fe
}
func fib6(msg *internal.MsgFib6Entry) *FibEntry {
netns := NetNs(msg.Net)
fe := newFibEntry()
fe.NetNs = netns
copy(fe.IPNet.IP, msg.Address[:])
fe.IPNet.Mask = net.CIDRMask(int(msg.Length), net.IPv6len*8)
fe.FibEntryEvent = FibEntryEvent(msg.Event)
fe.Rtn = Rtn(msg.Type)
fe.RtTable = RtTable(msg.Table)
nhxid := netns.Xid(msg.Nh.Ifindex)
nh := newNH()
copy(nh.IP, msg.Nh.Gw[:])
nh.Xid = nhxid
nh.Ifindex = msg.Nh.Ifindex
nh.Weight = msg.Nh.Weight
nh.RtnhFlags = RtnhFlags(msg.Nh.Flags)
fe.NHs = append(fe.NHs, nh)
for _, sibling := range msg.Siblings() {
sibxid := netns.Xid(sibling.Ifindex)
nh = newNH()
copy(nh.IP, sibling.Gw[:])
nh.Xid = sibxid
nh.Ifindex = sibling.Ifindex
nh.Weight = sibling.Weight
nh.RtnhFlags = RtnhFlags(sibling.Flags)
fe.NHs = append(fe.NHs, nh)
}
fe.NetNs.fibentry(fe)
return fe
}