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#!/usr/bin/env python3
import unittest
from framework import VppTestCase
from asfframework import VppTestRunner
from scapy.layers.l2 import Ether
from scapy.packet import Raw
from scapy.layers.inet import IP, UDP
from random import randint
import re # for finding counters in "sh errors" output
class SFlowTestCase(VppTestCase):
"""sFlow test case"""
@classmethod
def setUpClass(self):
super(SFlowTestCase, self).setUpClass()
@classmethod
def teadDownClass(cls):
super(SFlowTestCase, cls).tearDownClass()
def setUp(self):
self.create_pg_interfaces(range(2)) # create pg0 and pg1
for i in self.pg_interfaces:
i.admin_up() # put the interface up
i.config_ip4() # configure IPv4 address on the interface
i.resolve_arp() # resolve ARP, so that we know VPP MAC
def tearDown(self):
for i in self.pg_interfaces:
i.admin_down()
i.unconfig()
i.set_table_ip4(0)
i.set_table_ip6(0)
def is_hw_interface_in_dump(self, dump, hw_if_index):
for i in dump:
if i.hw_if_index == hw_if_index:
return True
else:
return False
def enable_sflow_via_api(self):
## TEST: Enable one interface
ret = self.vapi.sflow_enable_disable(hw_if_index=1, enable_disable=True)
self.assertEqual(ret.retval, 0)
## TEST: interface dump all
ret = self.vapi.sflow_interface_dump()
self.assertTrue(self.is_hw_interface_in_dump(ret, 1))
## TEST: Disable one interface
ret = self.vapi.sflow_enable_disable(hw_if_index=1, enable_disable=False)
self.assertEqual(ret.retval, 0)
## TEST: interface dump all after enable + disable
ret = self.vapi.sflow_interface_dump()
self.assertEqual(len(ret), 0)
## TEST: Enable both interfaces
ret = self.vapi.sflow_enable_disable(hw_if_index=1, enable_disable=True)
self.assertEqual(ret.retval, 0)
ret = self.vapi.sflow_enable_disable(hw_if_index=2, enable_disable=True)
self.assertEqual(ret.retval, 0)
## TEST: interface dump all
ret = self.vapi.sflow_interface_dump()
self.assertTrue(self.is_hw_interface_in_dump(ret, 1))
self.assertTrue(self.is_hw_interface_in_dump(ret, 2))
## TEST: the default sampling rate
ret = self.vapi.sflow_sampling_rate_get()
self.assert_equal(ret.sampling_N, 10000)
## TEST: sflow_sampling_rate_set()
self.vapi.sflow_sampling_rate_set(sampling_N=1)
ret = self.vapi.sflow_sampling_rate_get()
self.assert_equal(ret.sampling_N, 1)
## TEST: the default polling interval
ret = self.vapi.sflow_polling_interval_get()
self.assert_equal(ret.polling_S, 20)
## TEST: sflow_polling_interval_set()
self.vapi.sflow_polling_interval_set(polling_S=10)
ret = self.vapi.sflow_polling_interval_get()
self.assert_equal(ret.polling_S, 10)
## TEST: the default header bytes
ret = self.vapi.sflow_header_bytes_get()
self.assert_equal(ret.header_B, 128)
## TEST: sflow_header_bytes_set()
self.vapi.sflow_header_bytes_set(header_B=96)
ret = self.vapi.sflow_header_bytes_get()
self.assert_equal(ret.header_B, 96)
def create_stream(self, src_if, dst_if, count):
packets = []
for i in range(count):
# create packet info stored in the test case instance
info = self.create_packet_info(src_if, dst_if)
# convert the info into packet payload
payload = self.info_to_payload(info)
# create the packet itself
p = (
Ether(dst=src_if.local_mac, src=src_if.remote_mac)
/ IP(src=src_if.remote_ip4, dst=dst_if.remote_ip4)
/ UDP(sport=randint(49152, 65535), dport=5678)
/ Raw(payload)
)
# store a copy of the packet in the packet info
info.data = p.copy()
# append the packet to the list
packets.append(p)
# return the created packet list
return packets
def verify_capture(self, src_if, dst_if, capture):
packet_info = None
for packet in capture:
try:
ip = packet[IP]
udp = packet[UDP]
# convert the payload to packet info object
payload_info = self.payload_to_info(packet[Raw])
# make sure the indexes match
self.assert_equal(
payload_info.src, src_if.sw_if_index, "source sw_if_index"
)
self.assert_equal(
payload_info.dst, dst_if.sw_if_index, "destination sw_if_index"
)
packet_info = self.get_next_packet_info_for_interface2(
src_if.sw_if_index, dst_if.sw_if_index, packet_info
)
# make sure we didn't run out of saved packets
self.assertIsNotNone(packet_info)
self.assert_equal(
payload_info.index, packet_info.index, "packet info index"
)
saved_packet = packet_info.data # fetch the saved packet
# assert the values match
self.assert_equal(ip.src, saved_packet[IP].src, "IP source address")
self.assert_equal(udp.sport, saved_packet[UDP].sport, "UDP source port")
except:
self.logger.error("Unexpected or invalid packet:", packet)
raise
remaining_packet = self.get_next_packet_info_for_interface2(
src_if.sw_if_index, dst_if.sw_if_index, packet_info
)
self.assertIsNone(
remaining_packet,
"Interface %s: Packet expected from interface "
"%s didn't arrive" % (dst_if.name, src_if.name),
)
def get_sflow_counter(self, counter):
counters = self.vapi.cli("sh errors").split("\n")
for i in range(1, len(counters) - 1):
results = counters[i].split()
if results[1] == "sflow":
if re.search(counter, counters[i]) is not None:
return int(results[0])
return None
def verify_sflow(self, count):
ctr_processed = "sflow packets processed"
ctr_sampled = "sflow packets sampled"
ctr_dropped = "sflow packets dropped"
ctr_ps_sent = "sflow PSAMPLE sent"
ctr_ps_fail = "sflow PSAMPLE send failed"
processed = self.get_sflow_counter(ctr_processed)
sampled = self.get_sflow_counter(ctr_sampled)
dropped = self.get_sflow_counter(ctr_dropped)
ps_sent = self.get_sflow_counter(ctr_ps_sent)
ps_fail = self.get_sflow_counter(ctr_ps_fail)
self.assert_equal(processed, count, ctr_processed)
self.assert_equal(sampled, count, ctr_sampled)
self.assert_equal(dropped, None, ctr_dropped)
# TODO decide how to warn if PSAMPLE is not working
# It requires a prior "sudo modprobe psample", but
# that should probably be done at system boot time
# or maybe in a systemctl startup script, so we
# should only warn here.
self.logger.info(ctr_ps_sent + "=" + str(ps_sent))
self.logger.info(ctr_ps_fail + "=" + str(ps_fail))
def test_basic(self):
self.enable_sflow_via_api()
count = 7
# create the packet stream
packets = self.create_stream(self.pg0, self.pg1, count)
# add the stream to the source interface
self.pg0.add_stream(packets)
# enable capture on both interfaces
self.pg0.enable_capture()
self.pg1.enable_capture()
# start the packet generator
self.pg_start()
# get capture - the proper count of packets was saved by
# create_packet_info() based on dst_if parameter
capture = self.pg1.get_capture()
# assert nothing captured on pg0 (always do this last, so that
# some time has already passed since pg_start())
self.pg0.assert_nothing_captured()
# verify capture
self.verify_capture(self.pg0, self.pg1, capture)
# verify sflow counters
self.verify_sflow(count)
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