| #!/usr/bin/env python3 |
| |
| import unittest |
| |
| from framework import VppTestCase |
| from asfframework import VppTestRunner |
| from vpp_ip_route import VppIpRoute, VppRoutePath |
| |
| 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 TestSRv6As(VppTestCase): |
| """SRv6 Static Proxy plugin Test Case""" |
| |
| @classmethod |
| def setUpClass(self): |
| super(TestSRv6As, self).setUpClass() |
| |
| @classmethod |
| def tearDownClass(cls): |
| super(TestSRv6As, cls).tearDownClass() |
| |
| def setUp(self): |
| """Perform test setup before each test case.""" |
| super(TestSRv6As, 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(TestSRv6As, 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_AS_IPv6_noSRH(self): |
| """Test SRv6 End.AS behavior with IPv6 traffic and no SRH rewrite.""" |
| self.run_SRv6_End_AS_IPv6( |
| sid_list=["a1::", "a2::a6", "a3::"], |
| test_sid_index=1, |
| rewrite_src_addr="a2::", |
| ) |
| |
| def test_SRv6_End_AS_IPv6_SRH(self): |
| """Test SRv6 End.AS behavior with IPv6 traffic and SRH rewrite.""" |
| self.run_SRv6_End_AS_IPv6( |
| sid_list=["a1::a6", "a2::", "a3::"], |
| test_sid_index=0, |
| rewrite_src_addr="a1::", |
| ) |
| |
| def test_SRv6_End_AS_IPv4_noSRH(self): |
| """Test SRv6 End.AS behavior with IPv4 traffic and no SRH rewrite.""" |
| self.run_SRv6_End_AS_IPv4( |
| sid_list=["a1::", "a2::a6", "a3::"], |
| test_sid_index=1, |
| rewrite_src_addr="a2::", |
| ) |
| |
| def test_SRv6_End_AS_IPv4_SRH(self): |
| """Test SRv6 End.AS behavior with IPv4 traffic and SRH rewrite.""" |
| self.run_SRv6_End_AS_IPv4( |
| sid_list=["a1::a6", "a2::", "a3::"], |
| test_sid_index=0, |
| rewrite_src_addr="a1::", |
| ) |
| |
| def test_SRv6_End_AS_L2_noSRH(self): |
| """Test SRv6 End.AS behavior with L2 traffic and no SRH rewrite.""" |
| self.run_SRv6_End_AS_L2( |
| sid_list=["a1::", "a2::a6", "a3::"], |
| test_sid_index=1, |
| rewrite_src_addr="a2::", |
| ) |
| |
| def test_SRv6_End_AS_L2_SRH(self): |
| """Test SRv6 End.AS behavior with L2 traffic and SRH rewrite.""" |
| self.run_SRv6_End_AS_L2( |
| sid_list=["a1::a6", "a2::", "a3::"], |
| test_sid_index=0, |
| rewrite_src_addr="a1::", |
| ) |
| |
| def run_SRv6_End_AS_L2(self, sid_list, test_sid_index, rewrite_src_addr): |
| """Run SRv6 End.AS test with L2 traffic.""" |
| self.rewrite_src_addr = rewrite_src_addr |
| self.rewrite_sid_list = sid_list[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, |
| sid_list[test_sid_index + 1], |
| 128, |
| [VppRoutePath(self.pg0.remote_ip6, self.pg0.sw_if_index)], |
| ) |
| route.add_vpp_config() |
| |
| # configure SRv6 localSID behavior |
| cli_str = ( |
| "sr localsid address " |
| + sid_list[test_sid_index] |
| + " behavior end.as" |
| + " oif " |
| + self.pg1.name |
| + " iif " |
| + self.pg1.name |
| + " src " |
| + self.rewrite_src_addr |
| ) |
| for s in self.rewrite_sid_list: |
| cli_str += " next " + s |
| 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( |
| sidlist=sid_list[::-1], segleft=len(sid_list) - 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_AS_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_AS_L2_in |
| ) |
| |
| # log the localsid counters |
| self.logger.info(self.vapi.cli("show sr localsid")) |
| |
| # remove SRv6 localSIDs |
| self.vapi.cli("sr localsid del address " + sid_list[test_sid_index]) |
| |
| # cleanup interfaces |
| self.teardown_interfaces() |
| |
| def run_SRv6_End_AS_IPv6(self, sid_list, test_sid_index, rewrite_src_addr): |
| """Run SRv6 End.AS test with IPv6 traffic.""" |
| self.rewrite_src_addr = rewrite_src_addr |
| self.rewrite_sid_list = sid_list[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, |
| sid_list[test_sid_index + 1], |
| 128, |
| [VppRoutePath(self.pg0.remote_ip6, self.pg0.sw_if_index)], |
| ) |
| route.add_vpp_config() |
| |
| # configure SRv6 localSID behavior |
| cli_str = ( |
| "sr localsid address " |
| + sid_list[test_sid_index] |
| + " behavior end.as" |
| + " nh " |
| + self.pg1.remote_ip6 |
| + " oif " |
| + self.pg1.name |
| + " iif " |
| + self.pg1.name |
| + " src " |
| + self.rewrite_src_addr |
| ) |
| for s in self.rewrite_sid_list: |
| cli_str += " next " + s |
| 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( |
| sidlist=sid_list[::-1], segleft=len(sid_list) - 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_AS_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_AS_IPv6_in |
| ) |
| |
| # log the localsid counters |
| self.logger.info(self.vapi.cli("show sr localsid")) |
| |
| # remove SRv6 localSIDs |
| self.vapi.cli("sr localsid del address " + sid_list[test_sid_index]) |
| |
| # cleanup interfaces |
| self.teardown_interfaces() |
| |
| def run_SRv6_End_AS_IPv4(self, sid_list, test_sid_index, rewrite_src_addr): |
| """Run SRv6 End.AS test with IPv4 traffic.""" |
| self.rewrite_src_addr = rewrite_src_addr |
| self.rewrite_sid_list = sid_list[test_sid_index + 1 : :] |
| |
| # send traffic to one destination interface |
| # source and destination interfaces are IPv6 only |
| self.setup_interfaces(ipv6=[True, False], ipv4=[True, True]) |
| |
| # configure route to next segment |
| route = VppIpRoute( |
| self, |
| sid_list[test_sid_index + 1], |
| 128, |
| [VppRoutePath(self.pg0.remote_ip6, self.pg0.sw_if_index)], |
| ) |
| route.add_vpp_config() |
| |
| # configure SRv6 localSID behavior |
| cli_str = ( |
| "sr localsid address " |
| + sid_list[test_sid_index] |
| + " behavior end.as" |
| + " nh " |
| + self.pg1.remote_ip4 |
| + " oif " |
| + self.pg1.name |
| + " iif " |
| + self.pg1.name |
| + " src " |
| + self.rewrite_src_addr |
| ) |
| for s in self.rewrite_sid_list: |
| cli_str += " next " + s |
| 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( |
| sidlist=sid_list[::-1], segleft=len(sid_list) - 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_AS_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_AS_IPv4_in |
| ) |
| |
| # log the localsid counters |
| self.logger.info(self.vapi.cli("show sr localsid")) |
| |
| # remove SRv6 localSIDs |
| self.vapi.cli("sr localsid del address " + sid_list[test_sid_index]) |
| |
| # cleanup interfaces |
| self.teardown_interfaces() |
| |
| def compare_rx_tx_packet_End_AS_IPv6_in(self, tx_pkt, rx_pkt): |
| """Compare input and output packet after passing End.AS |
| |
| :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) |
| rx_srh = None |
| |
| tx_ip = tx_pkt.getlayer(IPv6) |
| |
| # expected segment-list (SRH order) |
| tx_seglist = self.rewrite_sid_list[::-1] |
| |
| # received ip.src should be equal to SR Policy source |
| self.assertEqual(rx_ip.src, self.rewrite_src_addr) |
| # received ip.dst should be equal to expected sidlist[lastentry] |
| self.assertEqual(rx_ip.dst, tx_seglist[-1]) |
| |
| if len(tx_seglist) > 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 expected seglist |
| self.assertEqual(rx_srh.addresses, tx_seglist) |
| # segleft should be equal to size expected seglist-1 |
| self.assertEqual(rx_srh.segleft, len(tx_seglist) - 1) |
| # segleft should be equal to lastentry |
| self.assertEqual(rx_srh.segleft, rx_srh.lastentry) |
| # get payload |
| payload = rx_srh.payload |
| else: |
| # rx'ed packet should NOT have SRH |
| self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting)) |
| # get payload |
| payload = rx_ip.payload |
| |
| # the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt |
| # except for the hop-limit field |
| # -> update tx'ed hlim to the expected hlim |
| tx_ip.hlim = tx_ip.hlim - 1 |
| |
| self.assertEqual(payload, tx_ip) |
| |
| self.logger.debug("packet verification: SUCCESS") |
| |
| def compare_rx_tx_packet_End_AS_IPv4_in(self, tx_pkt, rx_pkt): |
| """Compare input and output packet after passing End.AS |
| |
| :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) |
| rx_srh = None |
| |
| tx_ip = tx_pkt.getlayer(IP) |
| |
| # expected segment-list (SRH order) |
| tx_seglist = self.rewrite_sid_list[::-1] |
| |
| # received ip.src should be equal to SR Policy source |
| self.assertEqual(rx_ip.src, self.rewrite_src_addr) |
| # received ip.dst should be equal to expected sidlist[lastentry] |
| self.assertEqual(rx_ip.dst, tx_seglist[-1]) |
| |
| if len(tx_seglist) > 1: |
| # rx'ed packet should have SRH and IPv4 header |
| self.assertTrue(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting)) |
| self.assertTrue(rx_ip.payload.haslayer(IP)) |
| # get SRH |
| rx_srh = rx_pkt.getlayer(IPv6ExtHdrSegmentRouting) |
| # rx'ed seglist should be equal to seglist |
| self.assertEqual(rx_srh.addresses, tx_seglist) |
| # segleft should be equal to size seglist-1 |
| self.assertEqual(rx_srh.segleft, len(tx_seglist) - 1) |
| # segleft should be equal to lastentry |
| self.assertEqual(rx_srh.segleft, rx_srh.lastentry) |
| payload = rx_srh.payload |
| else: |
| # rx'ed packet should NOT have SRH |
| self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting)) |
| # get payload |
| payload = rx_ip.payload |
| |
| # the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt |
| # except for the ttl field and ip checksum |
| # -> 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 |
| tx_ip = IP(scapy.compat.raw(tx_ip)) |
| |
| self.assertEqual(payload, tx_ip) |
| |
| self.logger.debug("packet verification: SUCCESS") |
| |
| def compare_rx_tx_packet_End_AS_L2_in(self, tx_pkt, rx_pkt): |
| """Compare input and output packet after passing End.AS |
| |
| :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) |
| rx_srh = None |
| |
| tx_ether = tx_pkt.getlayer(Ether) |
| |
| # expected segment-list (SRH order) |
| tx_seglist = self.rewrite_sid_list[::-1] |
| |
| # received ip.src should be equal to SR Policy source |
| self.assertEqual(rx_ip.src, self.rewrite_src_addr) |
| # received ip.dst should be equal to expected sidlist[lastentry] |
| self.assertEqual(rx_ip.dst, tx_seglist[-1]) |
| |
| if len(tx_seglist) > 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 seglist |
| self.assertEqual(rx_srh.addresses, tx_seglist) |
| # segleft should be equal to size seglist-1 |
| self.assertEqual(rx_srh.segleft, len(tx_seglist) - 1) |
| # segleft should be equal to lastentry |
| self.assertEqual(rx_srh.segleft, rx_srh.lastentry) |
| # nh should be "No Next Header" (143) |
| self.assertEqual(rx_srh.nh, 143) |
| # get payload |
| payload = rx_srh.payload |
| else: |
| # rx'ed packet should NOT have SRH |
| self.assertFalse(rx_pkt.haslayer(IPv6ExtHdrSegmentRouting)) |
| # get payload |
| payload = rx_ip.payload |
| |
| # the whole rx'ed pkt beyond SRH should be equal to tx'ed pkt |
| self.assertEqual(Ether(scapy.compat.raw(payload)), tx_ether) |
| |
| self.logger.debug("packet verification: SUCCESS") |
| |
| def compare_rx_tx_packet_End_AS_IPv6_out(self, tx_pkt, rx_pkt): |
| """Compare input and output packet after passing End.AS 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_AS_IPv4_out(self, tx_pkt, rx_pkt): |
| """Compare input and output packet after passing End.AS 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_AS_L2_out(self, tx_pkt, rx_pkt): |
| """Compare input and output packet after passing End.AS 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 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, sidlist, segleft): |
| """Create packet header: IPv6 encapsulated in SRv6: |
| IPv6 header with SRH, IPv6 header, UDP header |
| |
| :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 5678::1 |
| Outer IPv6 destination address is set to sidlist[segleft] |
| IPv6 source addresses is 1234::1 |
| IPv6 destination address is 4321::1 |
| UDP source port and destination port are 1234 |
| """ |
| |
| p = ( |
| IPv6(src="5678::1", 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, sidlist, segleft): |
| """Create packet header: IPv4 encapsulated in SRv6: |
| IPv6 header with SRH, IPv4 header, UDP header |
| |
| :param ipv4address dst: inner IPv4 destination address |
| :param list sidlist: segment list of outer IPv6 SRH |
| :param int segleft: segments-left field of outer IPv6 SRH |
| |
| Outer IPv6 destination address is set to sidlist[segleft] |
| IPv6 source address is 1234::1 |
| 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 = ( |
| IPv6(src="1234::1", 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, sidlist, segleft, vlan=0): |
| """Create packet header: L2 encapsulated in SRv6: |
| IPv6 header with SRH, L2 |
| |
| :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 |
| |
| Outer IPv6 destination address is set to sidlist[segleft] |
| IPv6 source address is 1234::1 |
| """ |
| 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="1234::1", 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) |