TEST:add L2BD arp term tests

Change-Id: I42414da9663ecfc8dfe5baf3e6615cf3b9b02e22
Signed-off-by: Eyal Bari <ebari@cisco.com>

test/test_l2bd_arp_term.py

@@ -0,0 +1,239 @@
+#!/usr/bin/env python
+""" L2BD ARP term Test """
+
+import unittest
+import random
+import copy
+
+from scapy.packet import Raw
+from scapy.layers.l2 import Ether, ARP
+from scapy.layers.inet import IP
+
+from framework import VppTestCase, VppTestRunner
+from util import Host, ppp, mactobinary
+
+
+class TestL2bdArpTerm(VppTestCase):
+    """ L2BD arp termination 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(TestL2bdArpTerm, cls).setUpClass()
+
+        try:
+            # Create pg interfaces
+            n_bd = 1
+            cls.ifs_per_bd = ifs_per_bd = 3
+            n_ifs = n_bd * ifs_per_bd
+            cls.create_pg_interfaces(range(n_ifs))
+
+            # Set up all interfaces
+            for i in cls.pg_interfaces:
+                i.admin_up()
+
+            cls.hosts = set()
+
+        except Exception:
+            super(TestL2bdArpTerm, cls).tearDownClass()
+            raise
+
+    def setUp(self):
+        """
+        Clear trace and packet infos before running each test.
+        """
+        self.reset_packet_infos()
+        super(TestL2bdArpTerm, self).setUp()
+
+    def tearDown(self):
+        """
+        Show various debug prints after each test.
+        """
+        super(TestL2bdArpTerm, self).tearDown()
+        if not self.vpp_dead:
+            self.logger.info(self.vapi.ppcli("show l2fib verbose"))
+            self.logger.info(self.vapi.ppcli("show bridge-domain 1 detail"))
+
+    def add_del_arp_term_hosts(self, entries, bd_id=1, is_add=1):
+        for e in entries:
+            self.vapi.bd_ip_mac_add_del(bd_id=bd_id,
+                                        mac=e.bin_mac,
+                                        ip=e.ip4n,
+                                        is_ipv6=0,
+                                        is_add=is_add)
+
+    @classmethod
+    def mac_list(cls, b6_range):
+        return ["00:00:ca:fe:00:%02x" % b6 for b6 in b6_range]
+
+    @classmethod
+    def ip4_host(cls, subnet, host, mac):
+        return Host(mac=mac,
+                    ip4="172.17.1%02u.%u" % (subnet, host))
+
+    @classmethod
+    def ip4_hosts(cls, subnet, start, mac_list):
+        return {cls.ip4_host(subnet, start + j, mac_list[j])
+                for j in range(len(mac_list))}
+
+    @classmethod
+    def bd_swifs(cls, b):
+        n = cls.ifs_per_bd
+        start = (b - 1) * n
+        return [cls.pg_interfaces[j] for j in range(start, start + n)]
+
+    def bd_add_del(self, bd_id=1, is_add=1):
+        if is_add:
+            self.vapi.bridge_domain_add_del(bd_id=bd_id, is_add=is_add)
+        for swif in self.bd_swifs(bd_id):
+            swif_idx = swif.sw_if_index
+            self.vapi.sw_interface_set_l2_bridge(
+                swif_idx, bd_id=bd_id, enable=is_add)
+        if not is_add:
+            self.vapi.bridge_domain_add_del(bd_id=bd_id, is_add=is_add)
+
+    @classmethod
+    def arp(cls, src_host, host):
+        return (Ether(dst="ff:ff:ff:ff:ff:ff", src=src_host.mac) /
+                ARP(op="who-has",
+                    hwsrc=src_host.bin_mac,
+                    pdst=host.ip4,
+                    psrc=src_host.ip4))
+
+    @classmethod
+    def arp_reqs(cls, src_host, entries):
+        return [cls.arp(src_host, e) for e in entries]
+
+    def response_host(self, src_host, arp_resp):
+        ether = arp_resp[Ether]
+        self.assertEqual(ether.dst, src_host.mac)
+
+        arp = arp_resp[ARP]
+        self.assertEqual(arp.hwtype, 1)
+        self.assertEqual(arp.ptype, 0x800)
+        self.assertEqual(arp.hwlen, 6)
+        self.assertEqual(arp.plen, 4)
+        arp_opts = {"who-has": 1, "is-at": 2}
+        self.assertEqual(arp.op, arp_opts["is-at"])
+        self.assertEqual(arp.hwdst, src_host.mac)
+        self.assertEqual(arp.pdst, src_host.ip4)
+        return Host(arp.hwsrc, arp.psrc)
+
+    def arp_resp_hosts(self, src_host, pkts):
+        return {self.response_host(src_host, p) for p in pkts}
+
+    def set_bd_flags(self, bd_id, **args):
+        """
+        Enable/disable defined feature(s) of the bridge domain.
+
+        :param int bd_id: Bridge domain ID.
+        :param list args: List of feature/status pairs. Allowed features: \
+        learn, forward, flood, uu_flood and arp_term. Status False means \
+        disable, status True means enable the feature.
+        :raise: ValueError in case of unknown feature in the input.
+        """
+        for flag in args:
+            if flag == "learn":
+                feature_bitmap = 1 << 0
+            elif flag == "forward":
+                feature_bitmap = 1 << 1
+            elif flag == "flood":
+                feature_bitmap = 1 << 2
+            elif flag == "uu_flood":
+                feature_bitmap = 1 << 3
+            elif flag == "arp_term":
+                feature_bitmap = 1 << 4
+            else:
+                raise ValueError("Unknown feature used: %s" % flag)
+            is_set = 1 if args[flag] else 0
+            self.vapi.bridge_flags(bd_id, is_set, feature_bitmap)
+        self.logger.info("Bridge domain ID %d updated" % bd_id)
+
+    def verify_arp(self, src_host, req_hosts, resp_hosts, bd_id=1):
+        reqs = self.arp_reqs(src_host, req_hosts)
+
+        for swif in self.bd_swifs(bd_id):
+            swif.add_stream(reqs)
+
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        for swif in self.bd_swifs(bd_id):
+            resp_pkts = swif.get_capture(len(resp_hosts))
+            resps = self.arp_resp_hosts(src_host, resp_pkts)
+            self.assertEqual(len(resps ^ resp_hosts), 0)
+
+    def test_l2bd_arp_term_01(self):
+        """ L2BD arp term - add 5 hosts, verify arp responses
+        """
+        src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
+        self.bd_add_del(1, is_add=1)
+        self.set_bd_flags(1, arp_term=True, flood=False,
+                          uu_flood=False, learn=False)
+        macs = self.mac_list(range(1, 5))
+        hosts = self.ip4_hosts(4, 1, macs)
+        self.add_del_arp_term_hosts(hosts, is_add=1)
+        self.verify_arp(src_host, hosts, hosts)
+        type(self).hosts = hosts
+
+    def test_l2bd_arp_term_02(self):
+        """ L2BD arp term - delete 3 hosts, verify arp responses
+        """
+        src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
+        macs = self.mac_list(range(1, 3))
+        deleted = self.ip4_hosts(4, 1, macs)
+        self.add_del_arp_term_hosts(deleted, is_add=0)
+        remaining = self.hosts - deleted
+        self.verify_arp(src_host, self.hosts, remaining)
+        type(self).hosts = remaining
+        self.bd_add_del(1, is_add=0)
+
+    def test_l2bd_arp_term_03(self):
+        """ L2BD arp term - recreate BD1, readd 3 hosts, verify arp responses
+        """
+        src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
+        self.bd_add_del(1, is_add=1)
+        self.set_bd_flags(1, arp_term=True, flood=False,
+                          uu_flood=False, learn=False)
+        macs = self.mac_list(range(1, 3))
+        readded = self.ip4_hosts(4, 1, macs)
+        self.add_del_arp_term_hosts(readded, is_add=1)
+        self.verify_arp(src_host, self.hosts | readded, readded)
+        type(self).hosts = readded
+
+    def test_l2bd_arp_term_04(self):
+        """ L2BD arp term - 2 IP4 addrs per host
+        """
+        src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
+        macs = self.mac_list(range(1, 3))
+        sub5_hosts = self.ip4_hosts(5, 1, macs)
+        self.add_del_arp_term_hosts(sub5_hosts, is_add=1)
+        hosts = self.hosts | sub5_hosts
+        self.verify_arp(src_host, hosts, hosts)
+        type(self).hosts = hosts
+        self.bd_add_del(1, is_add=0)
+
+    def test_l2bd_arp_term_05(self):
+        """ L2BD arp term - create and update 10 IP4-mac pairs
+        """
+        src_host = self.ip4_host(50, 50, "00:00:11:22:33:44")
+        self.bd_add_del(1, is_add=1)
+        self.set_bd_flags(1, arp_term=True, flood=False,
+                          uu_flood=False, learn=False)
+        macs1 = self.mac_list(range(10, 20))
+        hosts1 = self.ip4_hosts(5, 1, macs1)
+        self.add_del_arp_term_hosts(hosts1, is_add=1)
+        self.verify_arp(src_host, hosts1, hosts1)
+        macs2 = self.mac_list(range(20, 30))
+        hosts2 = self.ip4_hosts(5, 1, macs2)
+        self.add_del_arp_term_hosts(hosts2, is_add=1)
+        self.verify_arp(src_host, hosts1, hosts2)
+        self.bd_add_del(1, is_add=0)
+
+
+if __name__ == '__main__':
+    unittest.main(testRunner=VppTestRunner)

test/util.py

@@ -88,6 +88,11 @@ class Host(object):
         """ MAC address """
         return self._mac
 
+    @property
+    def bin_mac(self):
+        """ MAC address """
+        return mactobinary(self._mac)
+
     @property
     def ip4(self):
         """ IPv4 address - string """
@@ -119,6 +124,27 @@ class Host(object):
         raw, suitable as API parameter."""
         return socket.inet_pton(socket.AF_INET6, self._ip6_ll)
 
+    def __eq__(self, other):
+        if isinstance(other, Host):
+            return (self.mac == other.mac and
+                    self.ip4 == other.ip4 and
+                    self.ip6 == other.ip6 and
+                    self.ip6_ll == other.ip6_ll)
+        else:
+            return False
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    def __repr__(self):
+        return "Host { mac:%s ip4:%s ip6:%s ip6_ll:%s }" % (self.mac,
+                                                            self.ip4,
+                                                            self.ip6,
+                                                            self.ip6_ll)
+
+    def __hash__(self):
+        return hash(self.__repr__())
+
     def __init__(self, mac=None, ip4=None, ip6=None, ip6_ll=None):
         self._mac = mac
         self._ip4 = ip4

test/vpp_papi_provider.py

@@ -411,6 +411,14 @@ class VppPapiProvider(object):
                          'arp_term': arp_term,
                          'is_add': is_add})
 
+    def bd_ip_mac_add_del(self, bd_id, mac, ip, is_ipv6=0, is_add=1):
+        return self.api(self.papi.bd_ip_mac_add_del,
+                        {'bd_id': bd_id,
+                         'is_add': is_add,
+                         'is_ipv6': is_ipv6,
+                         'ip_address': ip,
+                         'mac_address': mac})
+
     def l2fib_add_del(self, mac, bd_id, sw_if_index, is_add=1, static_mac=0,
                       filter_mac=0, bvi_mac=0):
         """Create/delete L2 FIB entry.