d9b0c6fbf7
Drop pycodestyle for code style checking in favor of black. Black is much faster, stable PEP8 compliant code style checker offering also automatic formatting. It aims to be very stable and produce smallest diffs. It's used by many small and big projects. Running checkstyle with black takes a few seconds with a terse output. Thus, test-checkstyle-diff is no longer necessary. Expand scope of checkstyle to all python files in the repo, replacing test-checkstyle with checkstyle-python. Also, fixstyle-python is now available for automatic style formatting. Note: python virtualenv has been consolidated in test/Makefile, test/requirements*.txt which will eventually be moved to a central location. This is required to simply the automated generation of docker executor images in the CI. Type: improvement Change-Id: I022a326603485f58585e879ac0f697fceefbc9c8 Signed-off-by: Klement Sekera <klement.sekera@gmail.com> Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
202 lines
6.0 KiB
Python
202 lines
6.0 KiB
Python
#!/usr/bin/env python3
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"""IP4 and IP6 MTU functional tests"""
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#
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# Add tests for:
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# - sub interfaces
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# - Verify that adjacencies inherit MTU correctly
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# - Verify that sub-interfaces inherit MTU correctly
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# - Different types of interfaces?
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#
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import unittest
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from scapy.layers.inet6 import IPv6, Ether, IP, UDP, ICMPv6PacketTooBig
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from scapy.layers.inet import ICMP
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from framework import VppTestCase, VppTestRunner
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from vpp_ip import DpoProto
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from vpp_ip_route import VppIpRoute, VppRoutePath, FibPathProto
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from socket import AF_INET, AF_INET6, inet_pton
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from util import reassemble4
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""" Test_mtu is a subclass of VPPTestCase classes.
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MTU tests.
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"""
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class TestMTU(VppTestCase):
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"""MTU Test Case"""
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maxDiff = None
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@classmethod
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def setUpClass(cls):
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super(TestMTU, cls).setUpClass()
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cls.create_pg_interfaces(range(2))
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cls.interfaces = list(cls.pg_interfaces)
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@classmethod
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def tearDownClass(cls):
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super(TestMTU, cls).tearDownClass()
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def setUp(self):
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super(TestMTU, self).setUp()
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for i in self.interfaces:
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i.admin_up()
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i.config_ip4()
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i.config_ip6()
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i.disable_ipv6_ra()
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i.resolve_arp()
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i.resolve_ndp()
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def tearDown(self):
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super(TestMTU, self).tearDown()
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if not self.vpp_dead:
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for i in self.pg_interfaces:
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i.unconfig_ip4()
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i.unconfig_ip6()
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i.admin_down()
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def validate(self, rx, expected):
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self.assertEqual(rx, expected.__class__(expected))
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def validate_bytes(self, rx, expected):
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self.assertEqual(rx, expected)
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def payload(self, len):
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return "x" * len
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def get_mtu(self, sw_if_index):
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rv = self.vapi.sw_interface_dump(sw_if_index=sw_if_index)
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for i in rv:
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if i.sw_if_index == sw_if_index:
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return i.mtu[0]
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return 0
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def test_ip4_mtu(self):
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"""IP4 MTU test"""
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p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
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p_ip4 = IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4, flags="DF")
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current_mtu = self.get_mtu(self.pg1.sw_if_index)
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p_payload = UDP(sport=1234, dport=1234) / self.payload(current_mtu - 20 - 8)
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p4 = p_ether / p_ip4 / p_payload
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p4_reply = p_ip4 / p_payload
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p4_reply.ttl -= 1
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rx = self.send_and_expect(self.pg0, p4 * 11, self.pg1)
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for p in rx:
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self.validate(p[1], p4_reply)
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# MTU
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self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [576, 0, 0, 0])
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self.assertEqual(576, self.get_mtu(self.pg1.sw_if_index))
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# Should fail. Too large MTU
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p_icmp4 = ICMP(
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type="dest-unreach",
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code="fragmentation-needed",
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nexthopmtu=576,
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chksum=0x2DBB,
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)
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icmp4_reply = (
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IP(src=self.pg0.local_ip4, dst=self.pg0.remote_ip4, ttl=254, len=576, id=0)
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/ p_icmp4
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/ p_ip4
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/ p_payload
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)
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n = icmp4_reply.__class__(icmp4_reply)
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s = bytes(icmp4_reply)
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icmp4_reply = s[0:576]
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rx = self.send_and_expect_some(self.pg0, p4 * 11, self.pg0)
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for p in rx:
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# p.show2()
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# n.show2()
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self.validate_bytes(bytes(p[1]), icmp4_reply)
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# Now with DF off. Expect fragments.
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# First go with 1500 byte packets.
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p_payload = UDP(sport=1234, dport=1234) / self.payload(1500 - 20 - 8)
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p4 = p_ether / p_ip4 / p_payload
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p4.flags = 0
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p4_reply = p_ip4 / p_payload
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p4_reply.ttl = p_ip4.ttl - 1
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p4_reply.flags = 0
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p4_reply.id = 256
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self.pg_enable_capture()
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self.pg0.add_stream(p4 * 1)
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self.pg_start()
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rx = self.pg1.get_capture(3)
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reass_pkt = reassemble4(rx)
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self.validate(reass_pkt, p4_reply)
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"""
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# Now what happens with a 9K frame
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p_payload = UDP(sport=1234, dport=1234) / self.payload(
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current_mtu - 20 - 8)
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p4 = p_ether / p_ip4 / p_payload
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p4.flags = 0
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p4_reply = p_ip4 / p_payload
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p4_reply.ttl = 62 # check this
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p4_reply.flags = 0
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p4_reply.id = 512
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self.pg_enable_capture()
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self.pg0.add_stream(p4*1)
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self.pg_start()
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rx = self.pg1.get_capture(16)
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reass_pkt = reassemble4(rx)
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reass_pkt.show2()
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p4_reply.show2()
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self.validate(reass_pkt, p4_reply)
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"""
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# Reset MTU
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self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [current_mtu, 0, 0, 0])
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def test_ip6_mtu(self):
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"""IP6 MTU test"""
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current_mtu = self.get_mtu(self.pg1.sw_if_index)
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p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
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p_ip6 = IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6)
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p_payload = UDP(sport=1234, dport=1234) / self.payload(current_mtu - 40 - 8)
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p6 = p_ether / p_ip6 / p_payload
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p6_reply = p_ip6 / p_payload
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p6_reply.hlim -= 1
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rx = self.send_and_expect(self.pg0, p6 * 9, self.pg1)
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for p in rx:
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self.validate(p[1], p6_reply)
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# MTU (only checked on encap)
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self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [1280, 0, 0, 0])
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self.assertEqual(1280, self.get_mtu(self.pg1.sw_if_index))
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# Should fail. Too large MTU
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p_icmp6 = ICMPv6PacketTooBig(mtu=1280, cksum=0x4C7A)
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icmp6_reply = (
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IPv6(src=self.pg0.local_ip6, dst=self.pg0.remote_ip6, hlim=255, plen=1240)
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/ p_icmp6
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/ p_ip6
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/ p_payload
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)
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icmp6_reply[2].hlim -= 1
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n = icmp6_reply.__class__(icmp6_reply)
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s = bytes(icmp6_reply)
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icmp6_reply_str = s[0:1280]
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rx = self.send_and_expect_some(self.pg0, p6 * 9, self.pg0)
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for p in rx:
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self.validate_bytes(bytes(p[1]), icmp6_reply_str)
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# Reset MTU
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self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [current_mtu, 0, 0, 0])
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if __name__ == "__main__":
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unittest.main(testRunner=VppTestRunner)
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