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TUN-6856: Refactor to lay foundation for tracing ICMP

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Remove send and return methods from Funnel interface. Users of Funnel can provide their own send and return methods without wrapper to comply with the interface.
Move packet router to ingress package to avoid circular dependency
This commit is contained in:
cthuang
2022-10-13 11:01:25 +01:00
parent 225c344ceb
commit 495f9fb8bd
15 changed files with 323 additions and 337 deletions
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27
ingress/icmp_linux.go
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@@ -97,10 +97,7 @@ func checkInPingGroup() error {
return fmt.Errorf("did not find group range in %s", pingGroupPath)
}
func (ip *icmpProxy) Request(pk *packet.ICMP, responder packet.FunnelUniPipe) error {
if pk == nil {
return errPacketNil
}
func (ip *icmpProxy) Request(ctx context.Context, pk *packet.ICMP, responder *packetResponder) error {
originalEcho, err := getICMPEcho(pk.Message)
if err != nil {
return err
@@ -113,13 +110,15 @@ func (ip *icmpProxy) Request(pk *packet.ICMP, responder packet.FunnelUniPipe) er
}
ip.logger.Debug().Msgf("Opened ICMP socket listen on %s", conn.LocalAddr())
newConnChan <- conn
closeCallback := func() error {
return conn.Close()
}
localUDPAddr, ok := conn.LocalAddr().(*net.UDPAddr)
if !ok {
return nil, fmt.Errorf("ICMP listener address %s is not net.UDPAddr", conn.LocalAddr())
}
originSender := originSender{conn: conn}
echoID := localUDPAddr.Port
icmpFlow := newICMPEchoFlow(pk.Src, &originSender, responder, echoID, originalEcho.ID, packet.NewEncoder())
icmpFlow := newICMPEchoFlow(pk.Src, closeCallback, conn, responder, echoID, originalEcho.ID, packet.NewEncoder())
return icmpFlow, nil
}
funnelID := flow3Tuple{
@@ -187,22 +186,6 @@ func (ip *icmpProxy) listenResponse(flow *icmpEchoFlow, conn *icmp.PacketConn) e
}
}
// originSender wraps icmp.PacketConn to implement packet.FunnelUniPipe interface
type originSender struct {
conn *icmp.PacketConn
}
func (os *originSender) SendPacket(dst netip.Addr, pk packet.RawPacket) error {
_, err := os.conn.WriteTo(pk.Data, &net.UDPAddr{
IP: dst.AsSlice(),
})
return err
}
func (os *originSender) Close() error {
return os.conn.Close()
}
// Only linux uses flow3Tuple as FunnelID
func (ft flow3Tuple) Type() string {
return "srcIP_dstIP_echoID"