From b3655e5592e3e8e48eb087632f3fa71915891a9f Mon Sep 17 00:00:00 2001 From: Ole Troan Date: Thu, 16 Aug 2018 22:08:49 +0200 Subject: VPP-1392: VXLAN fails with IP fragmentation Not only is it wasteful to send all fragments back through ip4-lookup, but it doesn't work with tunnel mechanisms that don't have IP enabled on their payload side. Change-Id: Ic92d95982dddaa70969a2a6ea2f98edec7614425 Signed-off-by: Ole Troan --- test/test_vxlan.py | 47 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 46 insertions(+), 1 deletion(-) (limited to 'test/test_vxlan.py') diff --git a/test/test_vxlan.py b/test/test_vxlan.py index 1411dd6c026..3c824b5761a 100644 --- a/test/test_vxlan.py +++ b/test/test_vxlan.py @@ -6,11 +6,27 @@ import unittest from framework import VppTestCase, VppTestRunner from template_bd import BridgeDomain -from scapy.layers.l2 import Ether +from scapy.layers.l2 import Ether, Raw from scapy.layers.inet import IP, UDP from scapy.layers.vxlan import VXLAN from scapy.utils import atol +import StringIO + + +def reassemble(listoffragments): + buffer = StringIO.StringIO() + first = listoffragments[0] + buffer.seek(20) + for pkt in listoffragments: + buffer.seek(pkt[IP].frag*8) + buffer.write(pkt[IP].payload) + first.len = len(buffer.getvalue()) + 20 + first.flags = 0 + del(first.chksum) + header = str(first[IP])[:20] + return first[IP].__class__(header + buffer.getvalue()) + class TestVxlan(BridgeDomain, VppTestCase): """ VXLAN Test Case """ @@ -222,6 +238,35 @@ class TestVxlan(BridgeDomain, VppTestCase): super(TestVxlan, cls).tearDownClass() raise + def test_encap_big_packet(self): + """ Encapsulation test send big frame from pg1 + Verify receipt of encapsulated frames on pg0 + """ + + self.vapi.sw_interface_set_mtu(self.pg0.sw_if_index, [1500, 0, 0, 0]) + + frame = (Ether(src='00:00:00:00:00:02', dst='00:00:00:00:00:01') / + IP(src='4.3.2.1', dst='1.2.3.4') / + UDP(sport=20000, dport=10000) / + Raw('\xa5' * 1450)) + + self.pg1.add_stream([frame]) + + self.pg0.enable_capture() + + self.pg_start() + + # Pick first received frame and check if it's correctly encapsulated. + out = self.pg0.get_capture(2) + ether = out[0] + pkt = reassemble(out) + pkt = ether / pkt + self.check_encapsulation(pkt, self.single_tunnel_bd) + + payload = self.decapsulate(pkt) + # TODO: Scapy bug? + # self.assert_eq_pkts(payload, frame) + # Method to define VPP actions before tear down of the test case. # Overrides tearDown method in VppTestCase class. # @param self The object pointer. -- cgit 1.2.3-korg