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Implement redirect to in eBPF proxy

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This commit is contained in:
Zoltán Papp
2025-02-16 22:16:42 +01:00
parent 1f088b7e69
commit 06a17f0eee
6 changed files with 69 additions and 42 deletions
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16
client/iface/wgproxy/ebpf/proxy.go
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@@ -26,6 +26,10 @@ const (
loopbackAddr = "127.0.0.1"
)
var (
localHostNetIP = net.ParseIP("127.0.0.1")
)
// WGEBPFProxy definition for proxy with EBPF support
type WGEBPFProxy struct {
localWGListenPort int
@@ -249,19 +253,17 @@ func (p *WGEBPFProxy) prepareSenderRawSocket() (net.PacketConn, error) {
return packetConn, nil
}
func (p *WGEBPFProxy) sendPkg(data []byte, port int) error {
localhost := net.ParseIP("127.0.0.1")
func (p *WGEBPFProxy) sendPkg(data []byte, endpointAddr *net.UDPAddr) error {
payload := gopacket.Payload(data)
ipH := &layers.IPv4{
DstIP: localhost,
SrcIP: localhost,
DstIP: localHostNetIP,
SrcIP: endpointAddr.IP,
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolUDP,
}
udpH := &layers.UDP{
SrcPort: layers.UDPPort(port),
SrcPort: layers.UDPPort(endpointAddr.Port),
DstPort: layers.UDPPort(p.localWGListenPort),
}
@@ -276,7 +278,7 @@ func (p *WGEBPFProxy) sendPkg(data []byte, port int) error {
if err != nil {
return fmt.Errorf("serialize layers: %w", err)
}
if _, err = p.rawConn.WriteTo(layerBuffer.Bytes(), &net.IPAddr{IP: localhost}); err != nil {
if _, err = p.rawConn.WriteTo(layerBuffer.Bytes(), &net.IPAddr{IP: localHostNetIP}); err != nil {
return fmt.Errorf("write to raw conn: %w", err)
}
return nil