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#!/usr/bin/env python3
import unittest
import ipaddress
from framework import VppTestCase
from asfframework import VppTestRunner
from config import config
from scapy.layers.inet6 import IPv6, ICMPv6EchoRequest, ICMPv6DestUnreach
from scapy.layers.l2 import Ether
from scapy.packet import Raw
@unittest.skipIf("npt66" in config.excluded_plugins, "Exclude NPTv6 plugin tests")
class TestNPT66(VppTestCase):
"""NPTv6 Test Case"""
extra_vpp_plugin_config = [
"plugin npt66_plugin.so {enable}",
]
def setUp(self):
super(TestNPT66, self).setUp()
# create 2 pg interfaces
self.create_pg_interfaces(range(2))
for i in self.pg_interfaces:
i.admin_up()
i.config_ip6()
i.resolve_ndp()
def tearDown(self):
for i in self.pg_interfaces:
i.unconfig_ip6()
i.admin_down()
super(TestNPT66, self).tearDown()
def send_and_verify(self, internal, reply_icmp_error=False):
sendif = self.pg0
recvif = self.pg1
local_mac = self.pg0.local_mac
remote_mac = self.pg0.remote_mac
src = ipaddress.ip_interface(internal).ip + 1
dst = self.pg1.remote_ip6
p = (
Ether(dst=local_mac, src=remote_mac)
/ IPv6(src=src, dst=dst)
/ ICMPv6EchoRequest()
/ Raw(b"Request")
)
# print('Sending packet')
# p.show2()
rxs = self.send_and_expect(sendif, p, recvif)
for rx in rxs:
# print('Received packet')
# rx.show2()
original_cksum = rx[ICMPv6EchoRequest].cksum
del rx[ICMPv6EchoRequest].cksum
rx = rx.__class__(bytes(rx))
self.assertEqual(original_cksum, rx[ICMPv6EchoRequest].cksum)
# Generate a replies
if reply_icmp_error:
# print('Generating an ICMP error message')
reply = (
Ether(dst=rx[Ether].src, src=local_mac)
/ IPv6(src=rx[IPv6].dst, dst=rx[IPv6].src)
/ ICMPv6DestUnreach()
/ rx[IPv6]
)
# print('Sending ICMP error message reply')
# reply.show2()
replies = self.send_and_expect(recvif, reply, sendif)
for r in replies:
# print('Received ICMP error message reply on the other side')
# r.show2()
self.assertEqual(str(p[IPv6].src), r[IPv6].dst)
original_cksum = r[ICMPv6EchoRequest].cksum
del r[ICMPv6EchoRequest].cksum
r = r.__class__(bytes(r))
self.assertEqual(original_cksum, r[ICMPv6EchoRequest].cksum)
else:
reply = (
Ether(dst=rx[Ether].src, src=local_mac)
/ IPv6(src=rx[IPv6].dst, dst=rx[IPv6].src)
/ ICMPv6EchoRequest()
/ Raw(b"Reply")
)
replies = self.send_and_expect(recvif, reply, sendif)
for r in replies:
# r.show2()
self.assertEqual(str(p[IPv6].src), r[IPv6].dst)
original_cksum = r[ICMPv6EchoRequest].cksum
del r[ICMPv6EchoRequest].cksum
r = r.__class__(bytes(r))
self.assertEqual(original_cksum, r[ICMPv6EchoRequest].cksum)
def do_test(self, internal, external, reply_icmp_error=False):
"""Add NPT66 binding and send packet"""
self.vapi.npt66_binding_add_del(
sw_if_index=self.pg1.sw_if_index,
internal=internal,
external=external,
is_add=True,
)
## TODO use route api
self.vapi.cli(f"ip route add {internal} via {self.pg0.remote_ip6}")
self.send_and_verify(internal, reply_icmp_error=reply_icmp_error)
self.vapi.npt66_binding_add_del(
sw_if_index=self.pg1.sw_if_index,
internal=internal,
external=external,
is_add=False,
)
def test_npt66_simple(self):
"""Send and receive a packet through NPT66"""
self.do_test("fd00:0000:0000::/48", "2001:4650:c3ed::/48")
self.do_test("fc00:1::/48", "2001:db8:1::/48")
self.do_test("fc00:1234::/32", "2001:db8:1::/32")
self.do_test("fc00:1234::/63", "2001:db8:1::/56")
def test_npt66_icmp6(self):
"""Send and receive a packet through NPT66"""
# Test ICMP6 error packets
self.do_test(
"fd00:0000:0000::/48", "2001:4650:c3ed::/48", reply_icmp_error=True
)
self.do_test("fc00:1::/48", "2001:db8:1::/48", reply_icmp_error=True)
self.do_test("fc00:1234::/32", "2001:db8:1::/32", reply_icmp_error=True)
self.do_test("fc00:1234::/63", "2001:db8:1::/56", reply_icmp_error=True)
if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)
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