Add tcp process detection with ebpf

firewall/interception/ebpf/packet.go

@@ -0,0 +1,49 @@
+//go:build linux
+
+package ebpf
+
+import (
+	pmpacket "github.com/safing/portmaster/network/packet"
+)
+
+// packet implements the packet.Packet interface.
+type infoPacket struct {
+	pmpacket.Base
+}
+
+// LoadPacketData does nothing on Linux, as data is always fully parsed.
+func (pkt *infoPacket) LoadPacketData() error {
+	return nil // fmt.Errorf("can't load data info only packet")
+}
+
+func (pkt *infoPacket) Accept() error {
+	return nil // fmt.Errorf("can't accept info only packet")
+}
+
+func (pkt *infoPacket) Block() error {
+	return nil // fmt.Errorf("can't block info only packet")
+}
+
+func (pkt *infoPacket) Drop() error {
+	return nil // fmt.Errorf("can't block info only packet")
+}
+
+func (pkt *infoPacket) PermanentAccept() error {
+	return pkt.Accept()
+}
+
+func (pkt *infoPacket) PermanentBlock() error {
+	return pkt.Block()
+}
+
+func (pkt *infoPacket) PermanentDrop() error {
+	return nil // fmt.Errorf("can't drop info only packet")
+}
+
+func (pkt *infoPacket) RerouteToNameserver() error {
+	return nil // fmt.Errorf("can't reroute info only packet")
+}
+
+func (pkt *infoPacket) RerouteToTunnel() error {
+	return nil // fmt.Errorf("can't reroute info only packet")
+}