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conntrack.go
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conntrack.go
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package main
import (
"net"
"time"
log "github.com/sirupsen/logrus"
"go.universe.tf/natlab/portmanager"
)
type TranslatorVerdict int
const (
TranslatorVerdictAccept TranslatorVerdict = iota
TranslatorVerdictMangle
TranslatorVerdictDrop
)
// Translator is the top-level interface. Packets get fed in, may be
// mutated, and the verdict dictates whether the packet makes it off
// the machine.
type Translator interface {
TranslateOutUDP(packet []byte) TranslatorVerdict
TranslateInUDP(packet []byte) TranslatorVerdict
}
type ctEntry struct {
Original UDPAddr
Mapped UDPAddr
Close func()
Deadline time.Time
}
func (e *ctEntry) expired() bool {
return e.Deadline.Before(time.Now())
}
func (e *ctEntry) extend() {
e.Deadline = time.Now().Add(120 * time.Second)
}
type endpointIndependentNAT struct {
publicIP net.IP
// byOriginal matches on outbound packet 4-tuples.
byOriginal map[UDPAddr]*ctEntry
// byMapped matches on inbound packet 4-tuples
byMapped map[UDPAddr]*ctEntry
portManager *portmanager.PortManager
}
func NewAddressAndPortDependentNAT(wanIPs []net.IP) Translator {
cfg := &portmanager.Config{
WANIPs: wanIPs,
}
return &endpointIndependentNAT{
byOriginal: map[UDPAddr]*ctEntry{},
byMapped: map[UDPAddr]*ctEntry{},