src/vnet/plugin

#!/usr/bin/env python3

import unittest
import random
import socket
from ipaddress import IPv4Address, IPv6Address, AddressValueError

from framework import VppTestCase, VppTestRunner
from util import ppp

from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6
from vpp_ip_route import VppIpRoute, VppRoutePath

try:
    text_type = unicode
except NameError:
    text_type = str

#
# The number of packets to sent.
#
N_PKTS_IN_STREAM = 300


class TestECMP(VppTestCase):
    """ Equal-cost multi-path routing Test Case """

    @classmethod
    def setUpClass(cls):
        """
        Perform standard class setup (defined by class method setUpClass in
        class VppTestCase) before running the test case, set test case related
        variables and configure VPP.
        """
        super(TestECMP, cls).setUpClass()

        # create 4 pg interfaces
        cls.create_pg_interfaces(range(4))

        # packet sizes to test
        cls.pg_if_packet_sizes = [64, 1500, 9018]

        # setup interfaces
        for i in cls.pg_interfaces:
            i.admin_up()
            i.generate_remote_hosts(5)
            i.config_ip4()
            i.resolve_arp()
            i.configure_ipv4_neighbors()
            i.config_ip6()
            i.resolve_ndp()
            i.configure_ipv6_neighbors()

    @classmethod
    def tearDownClass(cls):
        if not cls.vpp_dead:
            for i in cls.pg_interfaces:
                i.unconfig_ip4()
                i.unconfig_ip6()
                i.admin_down()

        super(TestECMP, cls).tearDownClass()

    def setUp(self):
        super(TestECMP, self).setUp()
        self.reset_packet_infos()

    def tearDown(self):
        """
        Show various debug prints after each test.
        """
        super(TestECMP, self).tearDown()

    def show_commands_at_teardown(self):
        self.logger.info(self.vapi.ppcli("show ip4 neighbors"))
        self.logger.info(self.vapi.ppcli("show ip6 neighbors"))

    def get_ip_address(self, ip_addr_start, ip_prefix_len):
        """

        :param str ip_addr_start: Starting IPv4 or IPv6 address.
        :param int ip_prefix_len: IP address prefix length.
        :return: Random IPv4 or IPv6 address from required range.
        """
        try:
            ip_addr = IPv4Address(text_type(ip_addr_start))
            ip_max_len = 32
        except (AttributeError, AddressValueError):
            ip_addr = IPv6Address(text_type(ip_addr_start))
            ip_max_len = 128

        return str(ip_addr +
                   random.randint(0, 2 ** (ip_max_len - ip_prefix_len) - 2))

    def create_stream(self, src_if, src_ip_start, dst_ip_start,
                      ip_prefix_len, packet_sizes, ip_l=IP):
        """Create input packet stream for defined interfaces.

        :param VppInterface src_if: Source Interface for packet stream.
        :param str src_ip_start: Starting source IPv4 or IPv6 address.
        :param str dst_ip_start: Starting destination IPv4 or IPv6 address.
        :param int ip_prefix_len: IP address prefix length.
        :param list packet_sizes: packet size to test.
        :param Scapy ip_l: Required IP layer - IP or IPv6. (Default is IP.)
        """
        pkts = []
        for i in range(0, N_PKTS_IN_STREAM):
            info = self.create_packet_info(src_if, src_if)
            payload = self.info_to_payload(info)
            src_ip = self.get_ip_address(src_ip_start, ip_prefix_len)
            dst_ip = self.get_ip_address(dst_ip_start, ip_prefix_len)
            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
                 ip_l(src=src_ip, dst=dst_ip) /
                 UDP(sport=1234, dport=1234) /
                 Raw(payload))
            info.data = p.copy()
            size = random.choice(packet_sizes)
            self.extend_packet(p, size)
            pkts.append(p)
        return pkts

    def verify_capture(self, rx_if, capture, ip_l=IP):
        """Verify captured input packet stream for defined interface.

        :param VppInterface rx_if: Interface to verify captured packet stream.
        :param list capture: Captured packet stream.
        :param Scapy ip_l: Required IP layer - IP or IPv6. (Default is IP.)
        """
        self.logger.info("Verifying capture on interface %s" % rx_if.name)

        count = 0
        host_counters = {}
        for host_mac in rx_if._hosts_by_mac:
            host_counters[host_mac] = 0

        for packet in capture:
            try:
                ip_received = packet[ip_l]
                payload_info = self.payload_to_info(packet[Raw])
                packet_index = payload_info.index
                ip_sent = self._packet_infos[packet_index].data[ip_l]
                self.logger.debug("Got packet on port %s: src=%u (id=%u)" %
                                  (rx_if.name, payload_info.src, packet_index))
                # Check standard fields
                self.assertIn(packet.dst, rx_if._hosts_by_mac,
                              "Destination MAC address %s shouldn't be routed "
                              "via interface %s" % (packet.dst, rx_if.name))
                self.assertEqual(packet.src, rx_if.local_mac)
                self.assertEqual(ip_received.src, ip_sent.src)
                self.assertEqual(ip_received.dst, ip_sent.dst)
                host_counters[packet.dst] += 1
                self._packet_infos.pop(packet_index)

            except:
                self.logger.error(ppp("Unexpected or invalid packet:", packet))
                raise

        # We expect packet routed via all host of pg interface
        for host_mac in host_counters:
            nr = host_counters[host_mac]
            self.assertNotEqual(
                nr, 0, "No packet routed via host %s" % host_mac)
            self.logger.info("%u packets routed via host %s of %s interface" %
                             (nr, host_mac, rx_if.name))
            count += nr
        self.logger.info("Total amount of %u packets routed via %s interface" %
                         (count, rx_if.name))

        return count

    def create_ip_routes(self, dst_ip_net, dst_prefix_len, is_ipv6=0):
        """
        Create IP routes for defined destination IP network.

        :param str dst_ip_net: Destination IP network.
        :param int dst_prefix_len: IP address prefix length.
        :param int is_ipv6: 0 if an ip4 route, else ip6
        """

        paths = []
        for pg_if in self.pg_interfaces[1:]:
            for nh_host in pg_if.remote_hosts:
                nh_host_ip = nh_host.ip4 if is_ipv6 == 0 else nh_host.ip6
                paths.append(VppRoutePath(nh_host_ip,
                                          pg_if.sw_if_index))

        rip = VppIpRoute(self, dst_ip_net, dst_prefix_len, paths)
        rip.add_vpp_config()
        self.logger.info("Route via %s on %s created" %
                         (nh_host_ip, pg_if.name))

        self.logger.debug(self.vapi.ppcli("show ip fib"))
        self.logger.debug(self.vapi.ppcli("show ip6 fib"))

    def test_ip_ecmp(self):
        """ IP equal-cost multi-path routing test """

        src_ip_net = '16.0.0.1'
        dst_ip_net = '32.0.0.1'
        ip_prefix_len = 24

        self.create_ip_routes(dst_ip_net, ip_prefix_len)

        pkts = self.create_stream(self.pg0, src_ip_net, dst_ip_net,
                                  ip_prefix_len, self.pg_if_packet_sizes)
        self.pg0.add_stream(pkts)

        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        # We expect packets on pg1, pg2 and pg3, but not on pg0
        rx_count = 0
        for pg_if in self.pg_interfaces[1:]:
            capture = pg_if._get_capture(timeout=1)
            self.assertNotEqual(
                len(capture), 0, msg="No packets captured on %s" % pg_if.name)
            rx_count += self.verify_capture(pg_if, capture)
        self.pg0.assert_nothing_captured(remark="IP packets forwarded on pg0")

        # Check that all packets were forwarded via pg1, pg2 and pg3
        self.assertEqual(rx_count, len(pkts))

    def test_ip6_ecmp(self):
        """ IPv6 equal-cost multi-path routing test """

        src_ip_net = '3ffe:51::1'
        dst_ip_net = '3ffe:71::1'
        ip_prefix_len = 64

        self.create_ip_routes(dst_ip_net, ip_prefix_len, is_ipv6=1)

        pkts = self.create_stream(
            self.pg0, src_ip_net, dst_ip_net,
            ip_prefix_len, self.pg_if_packet_sizes, ip_l=IPv6)
        self.pg0.add_stream(pkts)

        self.pg_enable_capture(self.pg_interfaces)
        self.pg_start()

        # We expect packets on pg1, pg2 and pg3, but not on pg0
        rx_count = 0
        for pg_if in self.pg_interfaces[1:]:
            capture = pg_if._get_capture(timeout=1)
            self.assertNotEqual(
                len(capture), 0, msg="No packets captured on %s" % pg_if.name)
            rx_count += self.verify_capture(pg_if, capture, ip_l=IPv6)
        self.pg0.assert_nothing_captured(remark="IP packets forwarded on pg0")

        # Check that all packets were forwarded via pg1, pg2 and pg3
        self.assertEqual(rx_count, len(pkts))


if __name__ == '__main__':
    unittest.main(testRunner=VppTestRunner)
Age	Commit message (Collapse)	Author	Files	Lines
2017-11-28	VPP-268 Coding standards cleanup - vnet/vnet/plugin	Krishanpal singh	1	-0/+8
	Change-Id: Ida719f3997cb14ad869e97f6d8de301a0d19c370 Signed-off-by: Krishanpal singh <krish.singh03@gmail.com>
2017-02-03	Plugin infrastructure improvements	Damjan Marion	1	-8/+1
	This patch replaces requirement for vlib_plugin_register function in the plugin so file and introduces new macro: VLIB_PLUGIN_REGISTER () = { .version = "version string", .version_required = "requred version", .default_disabled = 1, .early_init = "early_init_function_name", }; Plugin will nor be loaded if .default_disabled is set to 1 unless explicitely enabled in startup.conf. If .verstion_required is set, plugin will not be loaded if there is version mismatch between plugin and vpp. This can be bypassed by setting "skip-version-check" for specific plugin. If .early-init string is present, plugin loader will try to resolve this specific symbol in the plugin namespace and make a function call. Following startup.conf configuration is added: plugins { path /path/to/plugin/directory plugin ila_plugin.so { enable skip-version-check } plugin acl_plugin.so { disable } } Change-Id: I706c691dd34d94ffe9e02b59831af8859a95f061 Signed-off-by: Damjan Marion <damarion@cisco.com>
2017-01-11	Makefile.am cleanup	Damjan Marion	1	-52/+0
	- remove unused stuff - add --quiet flag to libtool - avoid building some tests programs when tests are not enabled Change-Id: Ie34aeec1a598ad811256a00354f66cfddae9d0b9 Signed-off-by: Damjan Marion <damarion@cisco.com>
2016-12-28	Reorganize source tree to use single autotools instance	Damjan Marion	2	-0/+84
	Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23 Signed-off-by: Damjan Marion <damarion@cisco.com>