WIP GRE tunnel

1 files changed, 10 insertions, 0 deletions

diff --git a/pkg/tcpip/header/parse/parse.go b/pkg/tcpip/header/parse/parse.go
index 2042f214a..3e5336c04 100644
--- a/pkg/tcpip/header/parse/parse.go
+++ b/pkg/tcpip/header/parse/parse.go
@@ -169,3 +169,13 @@ func TCP(pkt *stack.PacketBuffer) bool {
 	pkt.TransportProtocolNumber = header.TCPProtocolNumber
 	return ok
 }
+
+// GRE parses a GRE packet found in pkt.Data and populates pkt's transport
+// header with the GRE header.
+//
+// Returns true if the header was successfully parsed.
+func GRE(pkt *stack.PacketBuffer) bool {
+	_, ok := pkt.TransportHeader().Consume(4)
+	pkt.TransportProtocolNumber = 47
+	return ok
+}