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vpp/test/test_srv6_ad_flow.py
Klement Sekera d9b0c6fbf7 tests: replace pycodestyle with black 
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>
2022-05-10 18:52:08 +00:00

680 lines
24 KiB
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#!/usr/bin/env python3
import unittest
import binascii
from socket import AF_INET6
from framework import VppTestCase, VppTestRunner
from vpp_ip import DpoProto
from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable
import scapy.compat
from scapy.packet import Raw
from scapy.layers.l2 import Ether, Dot1Q
from scapy.layers.inet6 import IPv6, UDP, IPv6ExtHdrSegmentRouting
from scapy.layers.inet import IP, UDP
from util import ppp
class TestSRv6AdFlow(VppTestCase):
"""SRv6 Flow-based Dynamic Proxy plugin Test Case"""
@classmethod
def setUpClass(self):
super(TestSRv6AdFlow, self).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestSRv6AdFlow, cls).tearDownClass()
def setUp(self):
"""Perform test setup before each test case."""
super(TestSRv6AdFlow, self).setUp()
# packet sizes, inclusive L2 overhead
self.pg_packet_sizes = [64, 512, 1518, 9018]
# reset packet_infos
self.reset_packet_infos()
def tearDown(self):
"""Clean up test setup after each test case."""
self.teardown_interfaces()
super(TestSRv6AdFlow, self).tearDown()
def configure_interface(
self, interface, ipv6=False, ipv4=False, ipv6_table_id=0, ipv4_table_id=0
):
"""Configure interface.
:param ipv6: configure IPv6 on interface
:param ipv4: configure IPv4 on interface
:param ipv6_table_id: FIB table_id for IPv6
:param ipv4_table_id: FIB table_id for IPv4
"""
self.logger.debug("Configuring interface %s" % (interface.name))
if ipv6:
self.logger.debug("Configuring IPv6")
interface.set_table_ip6(ipv6_table_id)
interface.config_ip6()
interface.resolve_ndp(timeout=5)
if ipv4:
self.logger.debug("Configuring IPv4")
interface.set_table_ip4(ipv4_table_id)
interface.config_ip4()
interface.resolve_arp()
interface.admin_up()
def setup_interfaces(self, ipv6=[], ipv4=[], ipv6_table_id=[], ipv4_table_id=[]):
"""Create and configure interfaces.
:param ipv6: list of interface IPv6 capabilities
:param ipv4: list of interface IPv4 capabilities
:param ipv6_table_id: list of intf IPv6 FIB table_ids
:param ipv4_table_id: list of intf IPv4 FIB table_ids
:returns: List of created interfaces.
"""
# how many interfaces?
if len(ipv6):
count = len(ipv6)
else:
count = len(ipv4)
self.logger.debug("Creating and configuring %d interfaces" % (count))
# fill up ipv6 and ipv4 lists if needed
# not enabled (False) is the default
if len(ipv6) < count:
ipv6 += (count - len(ipv6)) * [False]
if len(ipv4) < count:
ipv4 += (count - len(ipv4)) * [False]
# fill up table_id lists if needed
# table_id 0 (global) is the default
if len(ipv6_table_id) < count:
ipv6_table_id += (count - len(ipv6_table_id)) * [0]
if len(ipv4_table_id) < count:
ipv4_table_id += (count - len(ipv4_table_id)) * [0]
# create 'count' pg interfaces
self.create_pg_interfaces(range(count))
# setup all interfaces
for i in range(count):
intf = self.pg_interfaces[i]
self.configure_interface(
intf, ipv6[i], ipv4[i], ipv6_table_id[i], ipv4_table_id[i]
)
if any(ipv6):
self.logger.debug(self.vapi.cli("show ip6 neighbors"))
if any(ipv4):
self.logger.debug(self.vapi.cli("show ip4 neighbors"))
self.logger.debug(self.vapi.cli("show interface"))
self.logger.debug(self.vapi.cli("show hardware"))
return self.pg_interfaces
def teardown_interfaces(self):
"""Unconfigure and bring down interface."""
self.logger.debug("Tearing down interfaces")
# tear down all interfaces
# AFAIK they cannot be deleted
for i in self.pg_interfaces:
self.logger.debug("Tear down interface %s" % (i.name))
i.admin_down()
i.unconfig()
i.set_table_ip4(0)
i.set_table_ip6(0)
def test_SRv6_End_AD_IPv6(self):
"""Test SRv6 End.AD behavior with IPv6 traffic."""
self.src_addr = "a0::"
self.sid_list = ["a1::", "a2::a6", "a3::"]
self.test_sid_index = 1
# send traffic to one destination interface
# source and destination interfaces are IPv6 only
self.setup_interfaces(ipv6=[True, True])
# configure route to next segment
route = VppIpRoute(
self,
self.sid_list[self.test_sid_index + 1],
128,
[
VppRoutePath(
self.pg0.remote_ip6,
self.pg0.sw_if_index,
proto=DpoProto.DPO_PROTO_IP6,
)
],
)
route.add_vpp_config()
# configure SRv6 localSID behavior
cli_str = (
"sr localsid address "
+ self.sid_list[self.test_sid_index]
+ " behavior end.ad.flow"
+ " nh "
+ self.pg1.remote_ip6
+ " oif "
+ self.pg1.name
+ " iif "
+ self.pg1.name
)
self.vapi.cli(cli_str)
# log the localsids
self.logger.debug(self.vapi.cli("show sr localsid"))
# send one packet per packet size
count = len(self.pg_packet_sizes)
# prepare IPv6 in SRv6 headers
packet_header1 = self.create_packet_header_IPv6_SRH_IPv6(
srcaddr=self.src_addr,
sidlist=self.sid_list[::-1],
segleft=len(self.sid_list) - self.test_sid_index - 1,
)
# generate packets (pg0->pg1)
pkts1 = self.create_stream(
self.pg0, self.pg1, packet_header1, self.pg_packet_sizes, count
)
# send packets and verify received packets
self.send_and_verify_pkts(
self.pg0, pkts1, self.pg1, self.compare_rx_tx_packet_End_AD_IPv6_out
)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# prepare IPv6 header for returning packets
packet_header2 = self.create_packet_header_IPv6()
# generate returning packets (pg1->pg0)
pkts2 = self.create_stream(
self.pg1, self.pg0, packet_header2, self.pg_packet_sizes, count
)
# send packets and verify received packets
self.send_and_verify_pkts(
self.pg1, pkts2, self.pg0, self.compare_rx_tx_packet_End_AD_IPv6_in
)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# remove SRv6 localSIDs
cli_str = "sr localsid del address " + self.sid_list[self.test_sid_index]
self.vapi.cli(cli_str)
# cleanup interfaces
self.teardown_interfaces()
def compare_rx_tx_packet_End_AD_IPv6_out(self, tx_pkt, rx_pkt):
"""Compare input and output packet after passing End.AD with IPv6
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get first (outer) IPv6 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IPv6)
tx_ip = tx_pkt.getlayer(IPv6)
tx_ip2 = tx_pkt.getlayer(IPv6, 2)
# verify if rx'ed packet has no SRH
self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# the whole rx_ip pkt should be equal to tx_ip2
# except for the hlim field
# -> adjust tx'ed hlim to expected hlim
tx_ip2.hlim = tx_ip2.hlim - 1
self.assertEqual(rx_ip, tx_ip2)
self.logger.debug("packet verification: SUCCESS")
def compare_rx_tx_packet_End_AD_IPv6_in(self, tx_pkt, rx_pkt):
"""Compare input and output packet after passing End.AD
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get first (outer) IPv6 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IPv6)
# received ip.src should be equal to SR Policy source
self.assertEqual(rx_ip.src, self.src_addr)
# received ip.dst should be equal to expected sidlist next segment
self.assertEqual(rx_ip.dst, self.sid_list[self.test_sid_index + 1])
# rx'ed packet should have SRH
self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# get SRH
rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
# rx'ed seglist should be equal to SID-list in reversed order
self.assertEqual(rx_srh.addresses, self.sid_list[::-1])
# segleft should be equal to previous segleft value minus 1
self.assertEqual(rx_srh.segleft, len(self.sid_list) - self.test_sid_index - 2)
# lastentry should be equal to the SID-list length minus 1
self.assertEqual(rx_srh.lastentry, len(self.sid_list) - 1)
# the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
# except for the hop-limit field
tx_ip = tx_pkt.getlayer(IPv6)
# -> update tx'ed hlim to the expected hlim
tx_ip.hlim -= 1
# -> check payload
self.assertEqual(rx_srh.payload, tx_ip)
self.logger.debug("packet verification: SUCCESS")
def test_SRv6_End_AD_IPv4(self):
"""Test SRv6 End.AD behavior with IPv4 traffic."""
self.src_addr = "a0::"
self.sid_list = ["a1::", "a2::a4", "a3::"]
self.test_sid_index = 1
# send traffic to one destination interface
# source and destination interfaces are IPv6 only
self.setup_interfaces(ipv6=[True, False], ipv4=[False, True])
# configure route to next segment
route = VppIpRoute(
self,
self.sid_list[self.test_sid_index + 1],
128,
[
VppRoutePath(
self.pg0.remote_ip6,
self.pg0.sw_if_index,
proto=DpoProto.DPO_PROTO_IP6,
)
],
)
route.add_vpp_config()
# configure SRv6 localSID behavior
cli_str = (
"sr localsid address "
+ self.sid_list[self.test_sid_index]
+ " behavior end.ad.flow"
+ " nh "
+ self.pg1.remote_ip4
+ " oif "
+ self.pg1.name
+ " iif "
+ self.pg1.name
)
self.vapi.cli(cli_str)
# log the localsids
self.logger.debug(self.vapi.cli("show sr localsid"))
# send one packet per packet size
count = len(self.pg_packet_sizes)
# prepare IPv4 in SRv6 headers
packet_header1 = self.create_packet_header_IPv6_SRH_IPv4(
srcaddr=self.src_addr,
sidlist=self.sid_list[::-1],
segleft=len(self.sid_list) - self.test_sid_index - 1,
)
# generate packets (pg0->pg1)
pkts1 = self.create_stream(
self.pg0, self.pg1, packet_header1, self.pg_packet_sizes, count
)
# send packets and verify received packets
self.send_and_verify_pkts(
self.pg0, pkts1, self.pg1, self.compare_rx_tx_packet_End_AD_IPv4_out
)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# prepare IPv6 header for returning packets
packet_header2 = self.create_packet_header_IPv4()
# generate returning packets (pg1->pg0)
pkts2 = self.create_stream(
self.pg1, self.pg0, packet_header2, self.pg_packet_sizes, count
)
# send packets and verify received packets
self.send_and_verify_pkts(
self.pg1, pkts2, self.pg0, self.compare_rx_tx_packet_End_AD_IPv4_in
)
# log the localsid counters
self.logger.info(self.vapi.cli("show sr localsid"))
# remove SRv6 localSIDs
cli_str = "sr localsid del address " + self.sid_list[self.test_sid_index]
self.vapi.cli(cli_str)
# cleanup interfaces
self.teardown_interfaces()
def compare_rx_tx_packet_End_AD_IPv4_out(self, tx_pkt, rx_pkt):
"""Compare input and output packet after passing End.AD with IPv4
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get IPv4 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IP)
tx_ip = tx_pkt.getlayer(IPv6)
tx_ip2 = tx_pkt.getlayer(IP)
# verify if rx'ed packet has no SRH
self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# the whole rx_ip pkt should be equal to tx_ip2
# except for the ttl field and ip checksum
# -> adjust tx'ed ttl to expected ttl
tx_ip2.ttl = tx_ip2.ttl - 1
# -> set tx'ed ip checksum to None and let scapy recompute
tx_ip2.chksum = None
# read back the pkt (with str()) to force computing these fields
# probably other ways to accomplish this are possible
tx_ip2 = IP(scapy.compat.raw(tx_ip2))
self.assertEqual(rx_ip, tx_ip2)
self.logger.debug("packet verification: SUCCESS")
def compare_rx_tx_packet_End_AD_IPv4_in(self, tx_pkt, rx_pkt):
"""Compare input and output packet after passing End.AD
:param tx_pkt: transmitted packet
:param rx_pkt: received packet
"""
# get first (outer) IPv6 header of rx'ed packet
rx_ip = rx_pkt.getlayer(IPv6)
# received ip.src should be equal to SR Policy source
self.assertEqual(rx_ip.src, self.src_addr)
# received ip.dst should be equal to expected sidlist next segment
self.assertEqual(rx_ip.dst, self.sid_list[self.test_sid_index + 1])
# rx'ed packet should have SRH
self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting))
# get SRH
rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting)
# rx'ed seglist should be equal to SID-list in reversed order
self.assertEqual(rx_srh.addresses, self.sid_list[::-1])
# segleft should be equal to previous segleft value minus 1
self.assertEqual(rx_srh.segleft, len(self.sid_list) - self.test_sid_index - 2)
# lastentry should be equal to the SID-list length minus 1
self.assertEqual(rx_srh.lastentry, len(self.sid_list) - 1)
# the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt
# except for the ttl field and ip checksum
tx_ip = tx_pkt.getlayer(IP)
# -> adjust tx'ed ttl to expected ttl
tx_ip.ttl = tx_ip.ttl - 1
# -> set tx'ed ip checksum to None and let scapy recompute
tx_ip.chksum = None
# -> read back the pkt (with str()) to force computing these fields
# probably other ways to accomplish this are possible
self.assertEqual(rx_srh.payload, IP(scapy.compat.raw(tx_ip)))
self.logger.debug("packet verification: SUCCESS")
def create_stream(self, src_if, dst_if, packet_header, packet_sizes, count):
"""Create SRv6 input packet stream for defined interface.
:param VppInterface src_if: Interface to create packet stream for
:param VppInterface dst_if: destination interface of packet stream
:param packet_header: Layer3 scapy packet headers,
L2 is added when not provided,
Raw(payload) with packet_info is added
:param list packet_sizes: packet stream pckt sizes,sequentially applied
to packets in stream have
:param int count: number of packets in packet stream
:return: list of packets
"""
self.logger.info("Creating packets")
pkts = []
for i in range(0, count - 1):
payload_info = self.create_packet_info(src_if, dst_if)
self.logger.debug("Creating packet with index %d" % (payload_info.index))
payload = self.info_to_payload(payload_info)
# add L2 header if not yet provided in packet_header
if packet_header.getlayer(0).name == "Ethernet":
p = packet_header / Raw(payload)
else:
p = (
Ether(dst=src_if.local_mac, src=src_if.remote_mac)
/ packet_header
/ Raw(payload)
)
size = packet_sizes[i % len(packet_sizes)]
self.logger.debug("Packet size %d" % (size))
self.extend_packet(p, size)
# we need to store the packet with the automatic fields computed
# read back the dumped packet (with str())
# to force computing these fields
# probably other ways are possible
p = Ether(scapy.compat.raw(p))
payload_info.data = p.copy()
self.logger.debug(ppp("Created packet:", p))
pkts.append(p)
self.logger.info("Done creating packets")
return pkts
def send_and_verify_pkts(self, input, pkts, output, compare_func):
"""Send packets and verify received packets using compare_func
:param input: ingress interface of DUT
:param pkts: list of packets to transmit
:param output: egress interface of DUT
:param compare_func: function to compare in and out packets
"""
# add traffic stream to input interface
input.add_stream(pkts)
# enable capture on all interfaces
self.pg_enable_capture(self.pg_interfaces)
# start traffic
self.logger.info("Starting traffic")
self.pg_start()
# get output capture
self.logger.info("Getting packet capture")
capture = output.get_capture()
# assert nothing was captured on input interface
# input.assert_nothing_captured()
# verify captured packets
self.verify_captured_pkts(output, capture, compare_func)
def create_packet_header_IPv6(
self, saddr="1234::1", daddr="4321::1", sport=1234, dport=1234
):
"""Create packet header: IPv6 header, UDP header
:param dst: IPv6 destination address
IPv6 source address is 1234::1
IPv6 destination address is 4321::1
UDP source port and destination port are 1234
"""
p = IPv6(src=saddr, dst=daddr) / UDP(sport=sport, dport=dport)
return p
def create_packet_header_IPv6_SRH_IPv6(
self,
srcaddr,
sidlist,
segleft,
insrc="1234::1",
indst="4321::1",
sport=1234,
dport=1234,
):
"""Create packet header: IPv6 encapsulated in SRv6:
IPv6 header with SRH, IPv6 header, UDP header
:param int srcaddr: outer source address
:param list sidlist: segment list of outer IPv6 SRH
:param int segleft: segments-left field of outer IPv6 SRH
Outer IPv6 source address is set to srcaddr
Outer IPv6 destination address is set to sidlist[segleft]
Inner IPv6 source addresses is 1234::1
Inner IPv6 destination address is 4321::1
UDP source port and destination port are 1234
"""
p = (
IPv6(src=srcaddr, dst=sidlist[segleft])
/ IPv6ExtHdrSegmentRouting(addresses=sidlist, segleft=segleft, nh=41)
/ IPv6(src=insrc, dst=indst)
/ UDP(sport=sport, dport=dport)
)
return p
def create_packet_header_IPv4(self):
"""Create packet header: IPv4 header, UDP header
:param dst: IPv4 destination address
IPv4 source address is 123.1.1.1
IPv4 destination address is 124.1.1.1
UDP source port and destination port are 1234
"""
p = IP(src="123.1.1.1", dst="124.1.1.1") / UDP(sport=1234, dport=1234)
return p
def create_packet_header_IPv6_SRH_IPv4(self, srcaddr, sidlist, segleft):
"""Create packet header: IPv4 encapsulated in SRv6:
IPv6 header with SRH, IPv4 header, UDP header
:param int srcaddr: outer source address
:param list sidlist: segment list of outer IPv6 SRH
:param int segleft: segments-left field of outer IPv6 SRH
Outer IPv6 source address is set to srcaddr
Outer IPv6 destination address is set to sidlist[segleft]
Inner IPv4 source address is 123.1.1.1
Inner IPv4 destination address is 124.1.1.1
UDP source port and destination port are 1234
"""
p = (
IPv6(src=srcaddr, dst=sidlist[segleft])
/ IPv6ExtHdrSegmentRouting(addresses=sidlist, segleft=segleft, nh=4)
/ IP(src="123.1.1.1", dst="124.1.1.1")
/ UDP(sport=1234, dport=1234)
)
return p
def get_payload_info(self, packet):
"""Extract the payload_info from the packet"""
# in most cases, payload_info is in packet[Raw]
# but packet[Raw] gives the complete payload
# (incl L2 header) for the T.Encaps L2 case
try:
payload_info = self.payload_to_info(packet[Raw])
except:
# remote L2 header from packet[Raw]:
# take packet[Raw], convert it to an Ether layer
# and then extract Raw from it
payload_info = self.payload_to_info(
Ether(scapy.compat.raw(packet[Raw]))[Raw]
)
return payload_info
def verify_captured_pkts(self, dst_if, capture, compare_func):
"""
Verify captured packet stream for specified interface.
Compare ingress with egress packets using the specified compare fn
:param dst_if: egress interface of DUT
:param capture: captured packets
:param compare_func: function to compare in and out packet
"""
self.logger.info(
"Verifying capture on interface %s using function %s"
% (dst_if.name, compare_func.__name__)
)
last_info = dict()
for i in self.pg_interfaces:
last_info[i.sw_if_index] = None
dst_sw_if_index = dst_if.sw_if_index
for packet in capture:
try:
# extract payload_info from packet's payload
payload_info = self.get_payload_info(packet)
packet_index = payload_info.index
self.logger.debug("Verifying packet with index %d" % (packet_index))
# packet should have arrived on the expected interface
self.assertEqual(payload_info.dst, dst_sw_if_index)
self.logger.debug(
"Got packet on interface %s: src=%u (idx=%u)"
% (dst_if.name, payload_info.src, packet_index)
)
# search for payload_info with same src and dst if_index
# this will give us the transmitted packet
next_info = self.get_next_packet_info_for_interface2(
payload_info.src, dst_sw_if_index, last_info[payload_info.src]
)
last_info[payload_info.src] = next_info
# next_info should not be None
self.assertTrue(next_info is not None)
# index of tx and rx packets should be equal
self.assertEqual(packet_index, next_info.index)
# data field of next_info contains the tx packet
txed_packet = next_info.data
self.logger.debug(
ppp("Transmitted packet:", txed_packet)
) # ppp=Pretty Print Packet
self.logger.debug(ppp("Received packet:", packet))
# compare rcvd packet with expected packet using compare_func
compare_func(txed_packet, packet)
except:
self.logger.error(ppp("Unexpected or invalid packet:", packet))
raise
# have all expected packets arrived?
for i in self.pg_interfaces:
remaining_packet = self.get_next_packet_info_for_interface2(
i.sw_if_index, dst_sw_if_index, last_info[i.sw_if_index]
)
self.assertTrue(
remaining_packet is None,
"Interface %s: Packet expected from interface %s "
"didn't arrive" % (dst_if.name, i.name),
)
if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)
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