macOS: Unable to decode EthernetType 34969

[haraldrudell]

Below is a test that fails on macOS 13.2.1 and earlier versions

Decode produces: Packet decoding error: Unable to decode EthernetType 34969

gopacket v1.1.19 — Oct 19, 2020

// ITEST= go test -v -run='^TestEthernet34969$' .
func TestEthernet34969(t *testing.T) {

	// check environment
	if _, ok := os.LookupEnv("ITEST"); !ok {
		t.Skip("set env ITEST to run integration test")
	}

	// Unable to decode EthernetType 34969
	var byts = []byte{255, 255, 255, 255, 255, 255, 216, 7, 182, 117, 112, 99, 136, 153, 37, 0, 0, 0, 216, 7, 182, 117,
		110, 161, 0, 1, 0, 0, 0, 216, 7, 182, 117, 112, 99, 255, 3, 101, 246, 138, 187, 21, 50, 210, 94, 108, 0, 43, 126, 31,
		225, 228, 134, 40, 171, 0, 90, 18, 134, 212}

	packet := gopacket.NewPacket(byts, layers.LayerTypeEthernet, gopacket.Default)
	t.Log(packet.String())
}

output:

ITEST= go test -v -run='^TestEthernet34969$' .

=== RUN   TestEthernet34969
    gopacket-decode_test.go:30: PACKET: 60 bytes
        - Layer 1 (14 bytes) = Ethernet {Contents=[..14..] Payload=[..46..] SrcMAC=d8:07:b6:75:70:63 DstMAC=ff:ff:ff:ff:ff:ff EthernetType=UnknownEthernetType Length=0}
        - Layer 2 (46 bytes) = DecodeFailure    Packet decoding error: Unable to decode EthernetType 34969

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