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#!/usr/bin/env python3
import socket
from util import ip4_range, reassemble4_ether
import unittest
from framework import VppTestCase, VppTestRunner
from template_bd import BridgeDomain
from scapy.layers.l2 import Ether
from scapy.packet import Raw
from scapy.layers.inet import IP, UDP
from scapy.layers.vxlan import VXLAN
from vpp_ip_route import VppIpRoute, VppRoutePath
from vpp_ip import INVALID_INDEX
class TestVxlanGbp(VppTestCase):
"""VXLAN GBP Test Case"""
@property
def frame_request(self):
"""Ethernet frame modeling a generic request"""
return (
Ether(src="00:00:00:00:00:01", dst="00:00:00:00:00:02")
/ IP(src="1.2.3.4", dst="4.3.2.1")
/ UDP(sport=10000, dport=20000)
/ Raw(b"\xa5" * 100)
)
@property
def frame_reply(self):
"""Ethernet frame modeling a generic reply"""
return (
Ether(src="00:00:00:00:00:02", dst="00:00:00:00:00:01")
/ IP(src="4.3.2.1", dst="1.2.3.4")
/ UDP(sport=20000, dport=10000)
/ Raw(b"\xa5" * 100)
)
def encapsulate(self, pkt, vni):
"""
Encapsulate the original payload frame by adding VXLAN GBP header with
its UDP, IP and Ethernet fields
"""
return (
Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
/ IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4)
/ UDP(sport=self.dport, dport=self.dport, chksum=0)
/ VXLAN(vni=vni, flags=self.flags, gpflags=self.gpflags, gpid=self.sclass)
/ pkt
)
def ip_range(self, start, end):
"""range of remote ip's"""
return ip4_range(self.pg0.remote_ip4, start, end)
def decapsulate(self, pkt):
"""
Decapsulate the original payload frame by removing VXLAN header
"""
# check if is set G and I flag
self.assertEqual(pkt[VXLAN].flags, int("0x88", 16))
return pkt[VXLAN].payload
# Method for checking VXLAN GBP encapsulation.
#
def check_encapsulation(self, pkt, vni, local_only=False, mcast_pkt=False):
# TODO: add error messages
# Verify source MAC is VPP_MAC and destination MAC is MY_MAC resolved
# by VPP using ARP.
self.assertEqual(pkt[Ether].src, self.pg0.local_mac)
if not local_only:
if not mcast_pkt:
self.assertEqual(pkt[Ether].dst, self.pg0.remote_mac)
else:
self.assertEqual(pkt[Ether].dst, type(self).mcast_mac)
# Verify VXLAN GBP tunnel source IP is VPP_IP and destination IP is
# MY_IP.
self.assertEqual(pkt[IP].src, self.pg0.local_ip4)
if not local_only:
if not mcast_pkt:
self.assertEqual(pkt[IP].dst, self.pg0.remote_ip4)
else:
self.assertEqual(pkt[IP].dst, type(self).mcast_ip4)
# Verify UDP destination port is VXLAN GBP 48879, source UDP port could
# be arbitrary.
self.assertEqual(pkt[UDP].dport, type(self).dport)
# Verify UDP checksum
self.assert_udp_checksum_valid(pkt)
# Verify VNI
# pkt.show()
self.assertEqual(pkt[VXLAN].vni, vni)
# Verify Source Class
self.assertEqual(pkt[VXLAN].gpid, 0)
@classmethod
def create_vxlan_gbp_flood_test_bd(cls, vni, n_ucast_tunnels):
# Create 2 ucast vxlan tunnels under bd
ip_range_start = 10
ip_range_end = ip_range_start + n_ucast_tunnels
next_hop_address = cls.pg0.remote_ip4
for dest_ip4 in ip4_range(cls.pg0.remote_ip4, ip_range_start, ip_range_end):
# add host route so dest_ip4 will not be resolved
rip = VppIpRoute(
cls,
dest_ip4,
32,
[VppRoutePath(next_hop_address, INVALID_INDEX)],
register=False,
)
rip.add_vpp_config()
r = cls.vapi.vxlan_gbp_tunnel_add_del(
tunnel={
"src": cls.pg0.local_ip4,
"dst": dest_ip4,
"vni": vni,
"instance": INVALID_INDEX,
"mcast_sw_if_index": INVALID_INDEX,
"mode": 1,
},
is_add=1,
)
cls.vapi.sw_interface_set_l2_bridge(rx_sw_if_index=r.sw_if_index, bd_id=vni)
# Class method to start the VXLAN GBP test case.
# Overrides setUpClass method in VppTestCase class.
# Python try..except statement is used to ensure that the tear down of
# the class will be executed even if exception is raised.
# @param cls The class pointer.
@classmethod
def setUpClass(cls):
super(TestVxlanGbp, cls).setUpClass()
try:
cls.dport = 48879
cls.flags = 0x88
cls.gpflags = 0x0
cls.sclass = 0
# Create 2 pg interfaces.
cls.create_pg_interfaces(range(4))
for pg in cls.pg_interfaces:
pg.admin_up()
# Configure IPv4 addresses on VPP pg0.
cls.pg0.config_ip4()
# Resolve MAC address for VPP's IP address on pg0.
cls.pg0.resolve_arp()
# Create VXLAN GBP VTEP on VPP pg0, and put vxlan_gbp_tunnel0 and
# pg1 into BD.
cls.single_tunnel_bd = 1
cls.single_tunnel_vni = 0xABCDE
r = cls.vapi.vxlan_gbp_tunnel_add_del(
tunnel={
"src": cls.pg0.local_ip4,
"dst": cls.pg0.remote_ip4,
"vni": cls.single_tunnel_vni,
"instance": INVALID_INDEX,
"mcast_sw_if_index": INVALID_INDEX,
"mode": 1,
},
is_add=1,
)
cls.vapi.sw_interface_set_l2_bridge(
rx_sw_if_index=r.sw_if_index, bd_id=cls.single_tunnel_bd
)
cls.vapi.sw_interface_set_l2_bridge(
rx_sw_if_index=cls.pg1.sw_if_index, bd_id=cls.single_tunnel_bd
)
# Setup vni 2 to test multicast flooding
cls.n_ucast_tunnels = 2
# Setup vni 3 to test unicast flooding
cls.ucast_flood_bd = 3
cls.create_vxlan_gbp_flood_test_bd(cls.ucast_flood_bd, cls.n_ucast_tunnels)
cls.vapi.sw_interface_set_l2_bridge(
rx_sw_if_index=cls.pg3.sw_if_index, bd_id=cls.ucast_flood_bd
)
except Exception:
super(TestVxlanGbp, cls).tearDownClass()
raise
@classmethod
def tearDownClass(cls):
super(TestVxlanGbp, cls).tearDownClass()
def assert_eq_pkts(self, pkt1, pkt2):
"""Verify the Ether, IP, UDP, payload are equal in both
packets
"""
self.assertEqual(pkt1[Ether].src, pkt2[Ether].src)
self.assertEqual(pkt1[Ether].dst, pkt2[Ether].dst)
self.assertEqual(pkt1[IP].src, pkt2[IP].src)
self.assertEqual(pkt1[IP].dst, pkt2[IP].dst)
self.assertEqual(pkt1[UDP].sport, pkt2[UDP].sport)
self.assertEqual(pkt1[UDP].dport, pkt2[UDP].dport)
self.assertEqual(pkt1[Raw], pkt2[Raw])
def test_decap(self):
"""Decapsulation test
Send encapsulated frames from pg0
Verify receipt of decapsulated frames on pg1
"""
encapsulated_pkt = self.encapsulate(self.frame_request, self.single_tunnel_vni)
self.pg0.add_stream(
[
encapsulated_pkt,
]
)
self.pg1.enable_capture()
self.pg_start()
# Pick first received frame and check if it's the non-encapsulated
# frame
out = self.pg1.get_capture(1)
pkt = out[0]
self.assert_eq_pkts(pkt, self.frame_request)
def test_encap(self):
"""Encapsulation test
Send frames from pg1
Verify receipt of encapsulated frames on pg0
"""
self.pg1.add_stream([self.frame_reply])
self.pg0.enable_capture()
self.pg_start()
# Pick first received frame and check if it's correctly encapsulated.
out = self.pg0.get_capture(1)
pkt = out[0]
self.check_encapsulation(pkt, self.single_tunnel_vni)
payload = self.decapsulate(pkt)
self.assert_eq_pkts(payload, self.frame_reply)
def test_ucast_flood(self):
"""Unicast flood test
Send frames from pg3
Verify receipt of encapsulated frames on pg0
"""
self.pg3.add_stream([self.frame_reply])
self.pg0.enable_capture()
self.pg_start()
# Get packet from each tunnel and assert it's correctly encapsulated.
out = self.pg0.get_capture(self.n_ucast_tunnels)
for pkt in out:
self.check_encapsulation(pkt, self.ucast_flood_bd, True)
payload = self.decapsulate(pkt)
self.assert_eq_pkts(payload, self.frame_reply)
def test_encap_big_packet(self):
"""Encapsulation test send big frame from pg1
Verify receipt of encapsulated frames on pg0
"""
self.vapi.sw_interface_set_mtu(self.pg0.sw_if_index, [1500, 0, 0, 0])
frame = (
Ether(src="00:00:00:00:00:02", dst="00:00:00:00:00:01")
/ IP(src="4.3.2.1", dst="1.2.3.4")
/ UDP(sport=20000, dport=10000)
/ Raw(b"\xa5" * 1450)
)
self.pg1.add_stream([frame])
self.pg0.enable_capture()
self.pg_start()
# Pick first received frame and check if it's correctly encapsulated.
out = self.pg0.get_capture(2)
pkt = reassemble4_ether(out)
self.check_encapsulation(pkt, self.single_tunnel_vni)
payload = self.decapsulate(pkt)
self.assert_eq_pkts(payload, frame)
# Method to define VPP actions before tear down of the test case.
# Overrides tearDown method in VppTestCase class.
# @param self The object pointer.
def tearDown(self):
super(TestVxlanGbp, self).tearDown()
def show_commands_at_teardown(self):
self.logger.info(self.vapi.cli("show bridge-domain 1 detail"))
self.logger.info(self.vapi.cli("show bridge-domain 3 detail"))
self.logger.info(self.vapi.cli("show vxlan-gbp tunnel"))
self.logger.info(self.vapi.cli("show error"))
if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)
|
