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Diffstat (limited to 'test/test_srv6_ad.py')
| -rw-r--r-- | test/test_srv6_ad.py | 809 |
1 files changed, 809 insertions, 0 deletions
diff --git a/test/test_srv6_ad.py b/test/test_srv6_ad.py new file mode 100644 index 00000000000..2627df32aa9 --- /dev/null +++ b/test/test_srv6_ad.py @@ -0,0 +1,809 @@ +#!/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 +from vpp_srv6 import SRv6LocalSIDBehaviors, VppSRv6LocalSID, VppSRv6Policy, \ + SRv6PolicyType, VppSRv6Steering, SRv6PolicySteeringTypes + +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 TestSRv6(VppTestCase): + """ SRv6 Dynamic Proxy plugin Test Case """ + + @classmethod + def setUpClass(self): + super(TestSRv6, self).setUpClass() + + @classmethod + def tearDownClass(cls): + super(TestSRv6, cls).tearDownClass() + + def setUp(self): + """ Perform test setup before each test case. + """ + super(TestSRv6, 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(TestSRv6, 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" + \ + " 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" + \ + " 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 test_SRv6_End_AD_L2(self): + """ Test SRv6 End.AD behavior with L2 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]) + + # 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" + \ + " 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 L2 in SRv6 headers + packet_header1 = self.create_packet_header_IPv6_SRH_L2( + srcaddr=self.src_addr, + sidlist=self.sid_list[::-1], + segleft=len(self.sid_list) - self.test_sid_index - 1, + vlan=0) + + # 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_L2_out) + + # log the localsid counters + self.logger.info(self.vapi.cli("show sr localsid")) + + # prepare L2 header for returning packets + packet_header2 = self.create_packet_header_L2() + + # 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_L2_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_L2_out(self, tx_pkt, rx_pkt): + """ Compare input and output packet after passing End.AD with L2 + + :param tx_pkt: transmitted packet + :param rx_pkt: received packet + """ + + # get IPv4 header of rx'ed packet + rx_eth = rx_pkt.getlayer(Ether) + + tx_ip = tx_pkt.getlayer(IPv6) + # we can't just get the 2nd Ether layer + # get the Raw content and dissect it as Ether + tx_eth1 = Ether(scapy.compat.raw(tx_pkt[Raw])) + + # verify if rx'ed packet has no SRH + self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting)) + + # the whole rx_eth pkt should be equal to tx_eth1 + self.assertEqual(rx_eth, tx_eth1) + + self.logger.debug("packet verification: SUCCESS") + + def compare_rx_tx_packet_End_AD_L2_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 + tx_ether = tx_pkt.getlayer(Ether) + self.assertEqual(Ether(scapy.compat.raw(rx_srh.payload)), tx_ether) + + 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): + """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='1234::1', dst='4321::1') / UDP(sport=1234, dport=1234) + return p + + def create_packet_header_IPv6_SRH_IPv6(self, srcaddr, sidlist, segleft): + """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='1234::1', dst='4321::1') / \ + UDP(sport=1234, dport=1234) + 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 create_packet_header_L2(self, vlan=0): + """Create packet header: L2 header + + :param vlan: if vlan!=0 then add 802.1q header + """ + # Note: the dst addr ('00:55:44:33:22:11') is used in + # the compare function compare_rx_tx_packet_T_Encaps_L2 + # to detect presence of L2 in SRH payload + p = Ether(src='00:11:22:33:44:55', dst='00:55:44:33:22:11') + etype = 0x8137 # IPX + if vlan: + # add 802.1q layer + p /= Dot1Q(vlan=vlan, type=etype) + else: + p.type = etype + return p + + def create_packet_header_IPv6_SRH_L2(self, srcaddr, sidlist, segleft, + vlan=0): + """Create packet header: L2 encapsulated in SRv6: + IPv6 header with SRH, L2 + + :param int srcaddr: IPv6 source address + :param list sidlist: segment list of outer IPv6 SRH + :param int segleft: segments-left field of outer IPv6 SRH + :param vlan: L2 vlan; if vlan!=0 then add 802.1q header + + IPv6 source address is set to srcaddr + IPv6 destination address is set to sidlist[segleft] + """ + eth = Ether(src='00:11:22:33:44:55', dst='00:55:44:33:22:11') + etype = 0x8137 # IPX + if vlan: + # add 802.1q layer + eth /= Dot1Q(vlan=vlan, type=etype) + else: + eth.type = etype + + p = IPv6(src=srcaddr, dst=sidlist[segleft]) / \ + IPv6ExtHdrSegmentRouting(addresses=sidlist, + segleft=segleft, nh=143) / \ + eth + 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) |