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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
#!/usr/bin/env python3
import unittest
import os
from socket import AF_INET6, inet_pton, inet_ntop
from framework import tag_fixme_vpp_workers
from framework import VppTestCase, VppTestRunner
from vpp_neighbor import VppNeighbor, find_nbr
from vpp_ip_route import VppIpRoute, VppRoutePath, find_route, \
VppIpTable, DpoProto, FibPathType, VppIpInterfaceAddress
from vpp_papi import VppEnum
from vpp_ip import VppIpPuntRedirect
import scapy.compat
from scapy.packet import Raw
from scapy.layers.l2 import Ether, ARP, Dot1Q
from scapy.layers.inet import IP, UDP, TCP
from scapy.layers.inet6 import IPv6, ipv6nh, ICMPv6ND_NS, ICMPv6ND_NA, \
ICMPv6NDOptSrcLLAddr, ICMPv6NDOptDstLLAddr, ICMPv6EchoRequest, \
ICMPv6EchoReply
from scapy.utils6 import in6_ptop, in6_getnsma, in6_getnsmac, in6_ismaddr
class TestNDPROXY(VppTestCase):
""" IP6 ND (mirror) Proxy Test Case """
@classmethod
def setUpClass(self):
super(TestNDPROXY, self).setUpClass()
self.create_pg_interfaces(range(2))
@classmethod
def tearDownClass(self):
super(TestNDPROXY, self).tearDownClass()
def setUp(self):
super(TestNDPROXY, self).setUp()
for i in self.pg_interfaces:
i.admin_up()
i.config_ip6()
i.disable_ipv6_ra()
def tearDown(self):
super(TestNDPROXY, self).tearDown()
if not self.vpp_dead:
for i in self.pg_interfaces:
i.unconfig_ip6()
i.admin_down()
def test_nd_mirror_proxy(self):
""" Interface (Mirror) Proxy ND """
#
# When VPP has an interface whose address is also applied to a TAP
# interface on the host, then VPP's TAP interface will be unnumbered
# to the 'real' interface and do proxy ND from the host.
# the curious aspect of this setup is that ND requests from the host
# will come from the VPP's own address.
#
addr = self.pg0.remote_ip6
nsma = in6_getnsma(inet_pton(socket.AF_INET6, addr))
d = inet_ntop(socket.AF_INET6, nsma)
# Make pg1 un-numbered to pg0
#
self.pg1.unconfig_ip6()
self.pg1.set_unnumbered(self.pg0.sw_if_index)
#
# Enable ND proxy on pg1
#
self.vapi.ip6nd_proxy_enable_disable(sw_if_index=self.pg1.sw_if_index,
is_enable=1)
#
# Send the ND request with an originating address that
# is VPP's own address
#
nd_req_from_host = (Ether(src=self.pg1.remote_mac,
dst=in6_getnsmac(nsma)) /
IPv6(dst=d, src=self.pg0.local_ip6) /
ICMPv6ND_NS(tgt=addr) /
ICMPv6NDOptSrcLLAddr(lladdr=self.pg1.remote_mac))
rx = self.send_and_expect(self.pg1, [nd_req_from_host], self.pg1)
self.assertEqual(rx[0][Ether].src, self.pg1.local_mac)
self.assertEqual(rx[0][Ether].dst, self.pg1.remote_mac)
self.assertEqual(rx[0][IPv6].src, self.pg0.remote_ip6)
self.assertEqual(rx[0][IPv6].dst, self.pg0.local_ip6)
self.assertEqual(ipv6nh[rx[0][IPv6].nh], "ICMPv6")
self.assertEqual(rx[0][ICMPv6ND_NA].tgt, self.pg0.remote_ip6)
self.assertTrue(rx[0].haslayer(ICMPv6NDOptDstLLAddr))
self.assertEqual(rx[0][ICMPv6NDOptDstLLAddr].lladdr,
self.pg1.local_mac)
#
# Send the unicast ND request
#
unicast_nd_req_from_host = (Ether(src=self.pg1.remote_mac,
dst=self.pg1.local_mac) /
IPv6(dst=self.pg0.remote_ip6,
src=self.pg1.remote_ip6_ll) /
ICMPv6ND_NS(tgt=self.pg0.remote_ip6) /
ICMPv6NDOptSrcLLAddr(
lladdr=self.pg1.remote_mac))
rx = self.send_and_expect(self.pg1, [unicast_nd_req_from_host],
self.pg0)
self.assertEqual(rx[0][Ether].src, self.pg0.local_mac)
self.assertEqual(rx[0][Ether].dst, in6_getnsmac(nsma))
self.assertEqual(rx[0][IPv6].src, self.pg0.local_ip6)
self.assertEqual(rx[0][IPv6].dst, d)
self.assertEqual(ipv6nh[rx[0][IPv6].nh], "ICMPv6")
self.assertEqual(rx[0][ICMPv6ND_NS].tgt, self.pg0.remote_ip6)
self.assertTrue(rx[0].haslayer(ICMPv6NDOptSrcLLAddr))
self.assertEqual(rx[0][ICMPv6NDOptSrcLLAddr].lladdr,
self.pg0.local_mac)
# Resolve the NDs on the uplink
self.pg0.resolve_ndp()
#
# Again send the unicast ND request, this time dst address should be
# in local cache
#
rx = self.send_and_expect(self.pg1, [unicast_nd_req_from_host],
self.pg1)
self.assertEqual(rx[0][Ether].src, self.pg1.local_mac)
self.assertEqual(rx[0][Ether].dst, self.pg1.remote_mac)
self.assertEqual(rx[0][IPv6].src, self.pg0.remote_ip6)
self.assertEqual(in6_ptop(rx[0][IPv6].dst),
in6_ptop(self.pg1.remote_ip6_ll))
self.assertEqual(ipv6nh[rx[0][IPv6].nh], "ICMPv6")
self.assertEqual(rx[0][ICMPv6ND_NA].tgt, self.pg0.remote_ip6)
self.assertTrue(rx[0].haslayer(ICMPv6NDOptDstLLAddr))
self.assertEqual(rx[0][ICMPv6NDOptDstLLAddr].lladdr,
self.pg1.local_mac)
#
# Send the Echo Request from host to remote (of uplink)
#
id = self.pg1.sw_if_index
seq = 0x1
echo_request = (Ether(dst=self.pg1.local_mac,
src=self.pg1.remote_mac) /
IPv6(dst=self.pg0.remote_ip6, src=self.pg0.local_ip6) /
ICMPv6EchoRequest(seq=seq, id=id))
rx = self.send_and_expect(self.pg1, [echo_request], self.pg0)
self.assertEqual(rx[0][Ether].src, self.pg0.local_mac)
self.assertEqual(rx[0][Ether].dst, self.pg0.remote_mac)
self.assertEqual(rx[0][IPv6].src, self.pg0.local_ip6)
self.assertEqual(rx[0][IPv6].dst, self.pg0.remote_ip6)
self.assertEqual(ipv6nh[rx[0][IPv6].nh], "ICMPv6")
self.assertTrue(rx[0].haslayer(ICMPv6EchoRequest))
self.assertEqual(rx[0][ICMPv6EchoRequest].id, id)
self.assertEqual(rx[0][ICMPv6EchoRequest].seq, seq)
#
# setup a punt redirect so packets from the uplink go to the tap
#
redirect = VppIpPuntRedirect(self, self.pg0.sw_if_index,
self.pg1.sw_if_index, self.pg0.local_ip6)
redirect.add_vpp_config()
echo_reply = (Ether(dst=self.pg0.remote_mac, src=self.pg0.local_mac) /
IPv6(dst=self.pg0.local_ip6, src=self.pg0.remote_ip6) /
ICMPv6EchoReply(seq=1, id=id))
rx = self.send_and_expect(self.pg0, [echo_reply], self.pg1)
self.assertEqual(rx[0][Ether].src, self.pg1.local_mac)
self.assertEqual(rx[0][Ether].dst, self.pg1.remote_mac)
self.assertEqual(rx[0][IPv6].src, self.pg0.remote_ip6)
self.assertEqual(rx[0][IPv6].dst, self.pg0.local_ip6)
self.assertEqual(ipv6nh[rx[0][IPv6].nh], "ICMPv6")
self.assertTrue(rx[0].haslayer(ICMPv6EchoReply))
self.assertEqual(rx[0][ICMPv6EchoReply].id, id)
self.assertEqual(rx[0][ICMPv6EchoReply].seq, seq)
#
# cleanup
#
self.vapi.ip6nd_proxy_enable_disable(sw_if_index=self.pg1.sw_if_index,
is_enable=0)
redirect.remove_vpp_config()
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
|
