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authorKlement Sekera <ksekera@cisco.com>2016-09-29 14:43:44 +0200
committerDave Barach <openvpp@barachs.net>2016-12-07 19:54:12 +0000
commit0e3c0de1ed87f3cdf16e26e05e39ea6eebeafb18 (patch)
treedd5f11c08311a95ce56eb8c33d4e8681940bf877 /test/test_bfd.py
parentd171d48edc1672564db8bb920586b8ea220df14c (diff)
BFD: basic asynchronous session up/down
This is a work-in-progress basic BFD session handling. Only asynchronous mode is supported at the moment. Setting the session flags doesn't work. Change-Id: Idba27f721b5c35be5a66a6d202a63d23ff7ecf6f Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'test/test_bfd.py')
-rw-r--r--test/test_bfd.py273
1 files changed, 273 insertions, 0 deletions
diff --git a/test/test_bfd.py b/test/test_bfd.py
new file mode 100644
index 00000000000..20d3aea5e0c
--- /dev/null
+++ b/test/test_bfd.py
@@ -0,0 +1,273 @@
+#!/usr/bin/env python
+
+import unittest
+import time
+from random import randint
+from bfd import *
+from framework import *
+from util import ppp
+
+
+class BFDCLITestCase(VppTestCase):
+ """Bidirectional Forwarding Detection (BFD) - CLI"""
+
+ @classmethod
+ def setUpClass(cls):
+ super(BFDCLITestCase, cls).setUpClass()
+
+ try:
+ cls.create_pg_interfaces([0])
+ cls.pg0.config_ip4()
+ cls.pg0.resolve_arp()
+
+ except Exception:
+ super(BFDCLITestCase, cls).tearDownClass()
+ raise
+
+ def test_add_bfd(self):
+ """ create a BFD session """
+ session = VppBFDUDPSession(self, self.pg0, self.pg0.remote_ip4)
+ session.add_vpp_config()
+ self.logger.debug("Session state is %s" % str(session.state))
+ session.remove_vpp_config()
+ session = VppBFDUDPSession(self, self.pg0, self.pg0.remote_ip4)
+ session.add_vpp_config()
+ self.logger.debug("Session state is %s" % str(session.state))
+ session.remove_vpp_config()
+
+ def test_double_add(self):
+ """ create the same BFD session twice (negative case) """
+ session = VppBFDUDPSession(self, self.pg0, self.pg0.remote_ip4)
+ session.add_vpp_config()
+ try:
+ session.add_vpp_config()
+ except:
+ session.remove_vpp_config()
+ return
+ session.remove_vpp_config()
+ raise Exception("Expected failure while adding duplicate "
+ "configuration")
+
+
+def create_packet(interface, ttl=255, src_port=50000, **kwargs):
+ p = (Ether(src=interface.remote_mac, dst=interface.local_mac) /
+ IP(src=interface.remote_ip4, dst=interface.local_ip4, ttl=ttl) /
+ UDP(sport=src_port, dport=BFD.udp_dport) /
+ BFD(*kwargs))
+ return p
+
+
+def verify_ip(test, packet, local_ip, remote_ip):
+ """ Verify correctness of IP layer. """
+ ip = packet[IP]
+ test.assert_equal(ip.src, local_ip, "IP source address")
+ test.assert_equal(ip.dst, remote_ip, "IP destination address")
+ test.assert_equal(ip.ttl, 255, "IP TTL")
+
+
+def verify_udp(test, packet):
+ """ Verify correctness of UDP layer. """
+ udp = packet[UDP]
+ test.assert_equal(udp.dport, BFD.udp_dport, "UDP destination port")
+ test.assert_in_range(udp.sport, BFD.udp_sport_min, BFD.udp_sport_max,
+ "UDP source port")
+
+
+class BFDTestSession(object):
+
+ def __init__(self, test, interface, detect_mult=3):
+ self.test = test
+ self.interface = interface
+ self.bfd_values = {
+ 'my_discriminator': 0,
+ 'desired_min_tx_interval': 500000,
+ 'detect_mult': detect_mult,
+ 'diag': BFDDiagCode.no_diagnostic,
+ }
+
+ def update(self, **kwargs):
+ self.bfd_values.update(kwargs)
+
+ def create_packet(self):
+ packet = create_packet(self.interface)
+ for name, value in self.bfd_values.iteritems():
+ packet[BFD].setfieldval(name, value)
+ return packet
+
+ def send_packet(self):
+ p = self.create_packet()
+ self.test.logger.debug(ppp("Sending packet:", p))
+ self.test.pg0.add_stream([p])
+ self.test.pg_start()
+
+ def verify_packet(self, packet):
+ """ Verify correctness of BFD layer. """
+ bfd = packet[BFD]
+ self.test.assert_equal(bfd.version, 1, "BFD version")
+ self.test.assert_equal(bfd.your_discriminator,
+ self.bfd_values['my_discriminator'],
+ "BFD - your discriminator")
+
+
+class BFDTestCase(VppTestCase):
+ """Bidirectional Forwarding Detection (BFD)"""
+
+ @classmethod
+ def setUpClass(cls):
+ super(BFDTestCase, cls).setUpClass()
+ try:
+ cls.create_pg_interfaces([0, 1])
+ cls.pg0.config_ip4()
+ cls.pg0.generate_remote_hosts()
+ cls.pg0.configure_ipv4_neighbors()
+ cls.pg0.admin_up()
+ cls.pg0.resolve_arp()
+
+ except Exception:
+ super(BFDTestCase, cls).tearDownClass()
+ raise
+
+ def setUp(self):
+ self.vapi.want_bfd_events()
+ self.vpp_session = VppBFDUDPSession(self, self.pg0, self.pg0.remote_ip4)
+ self.vpp_session.add_vpp_config()
+ self.vpp_session.admin_up()
+ self.test_session = BFDTestSession(self, self.pg0)
+
+ def tearDown(self):
+ self.vapi.want_bfd_events(enable_disable=0)
+ if not self.vpp_dead:
+ self.vpp_session.remove_vpp_config()
+ super(BFDTestCase, self).tearDown()
+
+ def verify_event(self, event, expected_state):
+ """ Verify correctness of event values. """
+ e = event
+ self.logger.debug("Event: %s" % repr(e))
+ self.assert_equal(e.bs_index, self.vpp_session.bs_index,
+ "BFD session index")
+ self.assert_equal(e.sw_if_index, self.vpp_session.interface.sw_if_index,
+ "BFD interface index")
+ is_ipv6 = 0
+ if self.vpp_session.af == AF_INET6:
+ is_ipv6 = 1
+ self.assert_equal(e.is_ipv6, is_ipv6, "is_ipv6")
+ if self.vpp_session.af == AF_INET:
+ self.assert_equal(e.local_addr[:4], self.vpp_session.local_addr_n,
+ "Local IPv4 address")
+ self.assert_equal(e.peer_addr[:4], self.vpp_session.peer_addr_n,
+ "Peer IPv4 address")
+ else:
+ self.assert_equal(e.local_addr, self.vpp_session.local_addr_n,
+ "Local IPv6 address")
+ self.assert_equal(e.peer_addr, self.vpp_session.peer_addr_n,
+ "Peer IPv6 address")
+ self.assert_equal(e.state, expected_state, BFDState)
+
+ def wait_for_bfd_packet(self, timeout=1):
+ p = self.pg0.wait_for_packet(timeout=timeout)
+ bfd = p[BFD]
+ if bfd is None:
+ raise Exception(ppp("Unexpected or invalid BFD packet:", p))
+ if bfd.payload:
+ raise Exception(ppp("Unexpected payload in BFD packet:", bfd))
+ verify_ip(self, p, self.pg0.local_ip4, self.pg0.remote_ip4)
+ verify_udp(self, p)
+ self.test_session.verify_packet(p)
+ return p
+
+ def test_slow_timer(self):
+ """ Slow timer """
+
+ self.pg_enable_capture([self.pg0])
+ expected_packets = 10
+ self.logger.info("Waiting for %d BFD packets" % expected_packets)
+ self.wait_for_bfd_packet()
+ for i in range(expected_packets):
+ before = time.time()
+ self.wait_for_bfd_packet()
+ after = time.time()
+ self.assert_in_range(
+ after - before, 0.75, 1, "time between slow packets")
+ before = after
+
+ def test_zero_remote_min_rx(self):
+ """ Zero RemoteMinRxInterval """
+ self.pg_enable_capture([self.pg0])
+ p = self.wait_for_bfd_packet()
+ self.test_session.update(my_discriminator=randint(0, 40000000),
+ your_discriminator=p[BFD].my_discriminator,
+ state=BFDState.init,
+ required_min_rx_interval=0)
+ self.test_session.send_packet()
+ e = self.vapi.wait_for_event(1, "bfd_udp_session_details")
+ self.verify_event(e, expected_state=BFDState.up)
+
+ try:
+ p = self.pg0.wait_for_packet(timeout=1)
+ except:
+ return
+ raise Exception(ppp("Received unexpected BFD packet:", p))
+
+ def bfd_conn_up(self):
+ self.pg_enable_capture([self.pg0])
+ self.logger.info("Waiting for slow hello")
+ p = self.wait_for_bfd_packet()
+ self.logger.info("Sending Init")
+ self.test_session.update(my_discriminator=randint(0, 40000000),
+ your_discriminator=p[BFD].my_discriminator,
+ state=BFDState.init,
+ required_min_rx_interval=500000)
+ self.test_session.send_packet()
+ self.logger.info("Waiting for event")
+ e = self.vapi.wait_for_event(1, "bfd_udp_session_details")
+ self.verify_event(e, expected_state=BFDState.up)
+ self.logger.info("Session is Up")
+ self.test_session.update(state=BFDState.up)
+
+ def test_conn_up(self):
+ """ Basic connection up """
+ self.bfd_conn_up()
+
+ def test_hold_up(self):
+ """ Hold BFD up """
+ self.bfd_conn_up()
+ for i in range(5):
+ self.wait_for_bfd_packet()
+ self.test_session.send_packet()
+
+ def test_conn_down(self):
+ """ Session down after inactivity """
+ self.bfd_conn_up()
+ self.wait_for_bfd_packet()
+ self.assert_equal(
+ 0, len(self.vapi.collect_events()),
+ "number of bfd events")
+ self.wait_for_bfd_packet()
+ self.assert_equal(
+ 0, len(self.vapi.collect_events()),
+ "number of bfd events")
+ e = self.vapi.wait_for_event(1, "bfd_udp_session_details")
+ self.verify_event(e, expected_state=BFDState.down)
+
+ @unittest.skip("this test is not working yet")
+ def test_large_required_min_rx(self):
+ self.bfd_conn_up()
+ interval = 5000000
+ self.test_session.update(required_min_rx_interval=interval)
+ self.test_session.send_packet()
+ now = time.time()
+ count = 1
+ while time.time() < now + interval / 1000000:
+ try:
+ p = self.wait_for_bfd_packet()
+ if count > 1:
+ self.logger.error(ppp("Received unexpected packet:", p))
+ count += 1
+ except:
+ pass
+ self.assert_equal(count, 1, "number of packets received")
+
+
+if __name__ == '__main__':
+ unittest.main(testRunner=VppTestRunner)