1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
#!/usr/bin/env python
import unittest
from framework import VppTestCase, VppTestRunner
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
class TestFlowperpkt(VppTestCase):
""" Flow-per-packet plugin: test both L2 and IP4 reporting """
def setUp(self):
"""
Set up
**Config:**
- create three PG interfaces
"""
super(TestFlowperpkt, self).setUp()
self.create_pg_interfaces(range(3))
self.pg_if_packet_sizes = [150]
self.interfaces = list(self.pg_interfaces)
for intf in self.interfaces:
intf.admin_up()
intf.config_ip4()
intf.resolve_arp()
def create_stream(self, src_if, dst_if, packet_sizes):
"""Create a packet stream to tickle the plugin
:param VppInterface src_if: Source interface for packet stream
:param VppInterface src_if: Dst interface for packet stream
:param list packet_sizes: Sizes to test
"""
pkts = []
for size in packet_sizes:
info = self.create_packet_info(src_if, dst_if)
payload = self.info_to_payload(info)
p = (Ether(src=src_if.local_mac, dst=dst_if.remote_mac) /
IP(src=src_if.remote_ip4, dst=dst_if.remote_ip4) /
UDP(sport=1234, dport=4321) /
Raw(payload))
info.data = p.copy()
self.extend_packet(p, size)
pkts.append(p)
return pkts
@staticmethod
def compare_with_mask(payload, masked_expected_data):
if len(payload) * 2 != len(masked_expected_data):
return False
# iterate over pairs: raw byte from payload and ASCII code for that byte
# from masked payload (or XX if masked)
for i in range(len(payload)):
p = payload[i]
m = masked_expected_data[2 * i:2 * i + 2]
if m != "XX":
if "%02x" % ord(p) != m:
return False
return True
def verify_ipfix(self, collector_if):
"""Check the ipfix capture"""
found_data_packet = False
found_template_packet = False
found_l2_data_packet = False
found_l2_template_packet = False
# Scapy, of course, understands ipfix not at all...
# These data vetted by manual inspection in wireshark
# X'ed out fields are timestamps, which will absolutely
# fail to compare.
data_udp_string = "1283128300370000000a002fXXXXXXXX000000000000000101"\
"00001f0000000100000002ac100102ac10020200XXXXXXXXXXXXXXXX0092"
template_udp_string = "12831283003c0000000a0034XXXXXXXX00000002000000"\
"010002002401000007000a0004000e000400080004000c000400050001009c00"\
"0801380002"
l2_data_udp_string = "12831283003c0000000a0034XXXXXXXX000000010000000"\
"1010100240000000100000002%s02020000ff020008XXXXXXXXXXX"\
"XXXXX0092" % self.pg1.local_mac.translate(None, ":")
l2_template_udp_string = "12831283003c0000000a0034XXXXXXXX00000002000"\
"000010002002401010007000a0004000e0004003800060050000601000002009"\
"c000801380002"
self.logger.info("Look for ipfix packets on %s sw_if_index %d "
% (collector_if.name, collector_if.sw_if_index))
# expecting 4 packets on collector interface based on traffic on other
# interfaces
capture = collector_if.get_capture(4)
for p in capture:
ip = p[IP]
udp = p[UDP]
self.logger.info("src %s dst %s" % (ip.src, ip.dst))
self.logger.info(" udp src_port %s dst_port %s"
% (udp.sport, udp.dport))
payload = str(udp)
if self.compare_with_mask(payload, data_udp_string):
self.logger.info("found ip4 data packet")
found_data_packet = True
elif self.compare_with_mask(payload, template_udp_string):
self.logger.info("found ip4 template packet")
found_template_packet = True
elif self.compare_with_mask(payload, l2_data_udp_string):
self.logger.info("found l2 data packet")
found_l2_data_packet = True
elif self.compare_with_mask(payload, l2_template_udp_string):
self.logger.info("found l2 template packet")
found_l2_template_packet = True
else:
unmasked_payload = "".join(["%02x" % ord(c) for c in payload])
self.logger.error("unknown pkt '%s'" % unmasked_payload)
self.assertTrue(found_data_packet, "Data packet not found")
self.assertTrue(found_template_packet, "Template packet not found")
self.assertTrue(found_l2_data_packet, "L2 data packet not found")
self.assertTrue(found_l2_template_packet,
"L2 template packet not found")
def test_L3_fpp(self):
""" Flow per packet L3 test """
# Configure an ipfix report on the [nonexistent] collector
# 172.16.3.2, as if it was connected to the pg2 interface
# Install a FIB entry, so the exporter's work won't turn into
# an ARP request
self.pg_enable_capture(self.pg_interfaces)
self.pg2.configure_ipv4_neighbors()
self.vapi.set_ipfix_exporter(collector_address=self.pg2.remote_ip4n,
src_address=self.pg2.local_ip4n,
path_mtu=1450,
template_interval=1)
# Export flow records for all pkts transmitted on pg1
self.vapi.cli("flowperpkt feature add-del pg1")
self.vapi.cli("flowperpkt feature add-del pg1 l2")
# Arrange to minimally trace generated ipfix packets
self.vapi.cli("trace add flowperpkt-ipv4 10")
self.vapi.cli("trace add flowperpkt-l2 10")
# Create a stream from pg0 -> pg1, which causes
# an ipfix packet to be transmitted on pg2
pkts = self.create_stream(self.pg0, self.pg1,
self.pg_if_packet_sizes)
self.pg0.add_stream(pkts)
self.pg_start()
# Flush the ipfix collector, so we don't need any
# asinine time.sleep(5) action
self.vapi.cli("ipfix flush")
# Make sure the 4 pkts we expect actually showed up
self.verify_ipfix(self.pg2)
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
|
