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#!/usr/bin/env python3
import unittest
from socket import inet_pton, inet_ntop
from framework import VppTestCase
from asfframework import VppTestRunner
from vpp_ip import VppIpPuntRedirect
from scapy.layers.l2 import Ether
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
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_ll)
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)
|
