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#!/usr/bin/env python
"""IP{4,6} over IP{v,6} tunnel functional tests"""
import unittest
from scapy.layers.inet6 import IPv6, Ether, IP, UDP, IPv6ExtHdrFragment
from scapy.all import fragment, fragment6, RandShort, defragment6
from framework import VppTestCase, VppTestRunner
from vpp_ip import DpoProto
from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable
from socket import AF_INET, AF_INET6, inet_pton
from util import reassemble4
""" Testipip is a subclass of VPPTestCase classes.
IPIP tests.
"""
class TestIPIP(VppTestCase):
""" IPIP Test Case """
@classmethod
def setUpClass(cls):
super(TestIPIP, cls).setUpClass()
cls.create_pg_interfaces(range(2))
cls.interfaces = list(cls.pg_interfaces)
@classmethod
def tearDownClass(cls):
super(TestIPIP, cls).tearDownClass()
def setUp(self):
super(TestIPIP, self).setUp()
for i in self.interfaces:
i.admin_up()
i.config_ip4()
i.config_ip6()
i.disable_ipv6_ra()
i.resolve_arp()
i.resolve_ndp()
def tearDown(self):
super(TestIPIP, self).tearDown()
if not self.vpp_dead:
for i in self.pg_interfaces:
i.unconfig_ip4()
i.unconfig_ip6()
i.admin_down()
def validate(self, rx, expected):
self.assertEqual(rx, expected.__class__(expected))
def generate_ip4_frags(self, payload_length, fragment_size):
p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
p_payload = UDP(sport=1234, dport=1234) / self.payload(payload_length)
p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
outer_ip4 = (p_ether / IP(src=self.pg1.remote_ip4,
id=RandShort(),
dst=self.pg0.local_ip4) / p_ip4 / p_payload)
frags = fragment(outer_ip4, fragment_size)
p4_reply = (p_ip4 / p_payload)
p4_reply.ttl -= 1
return frags, p4_reply
def test_ipip4(self):
""" ip{v4,v6} over ip4 test """
p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
p_ip6 = IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=42)
p_ip4 = IP(src="1.2.3.4", dst="130.67.0.1", tos=42)
p_payload = UDP(sport=1234, dport=1234)
# IPv4 transport
rv = self.vapi.ipip_add_tunnel(
src_address=self.pg0.local_ip4n,
dst_address=self.pg1.remote_ip4n,
is_ipv6=0, tc_tos=0xFF)
sw_if_index = rv.sw_if_index
# Set interface up and enable IP on it
self.vapi.sw_interface_set_flags(sw_if_index, 1)
self.vapi.sw_interface_set_unnumbered(
sw_if_index=self.pg0.sw_if_index,
unnumbered_sw_if_index=sw_if_index)
# Add IPv4 and IPv6 routes via tunnel interface
ip4_via_tunnel = VppIpRoute(
self, "130.67.0.0", 16,
[VppRoutePath("0.0.0.0",
sw_if_index,
proto=DpoProto.DPO_PROTO_IP4)], is_ip6=0)
ip4_via_tunnel.add_vpp_config()
ip6_via_tunnel = VppIpRoute(
self, "dead::", 16,
[VppRoutePath("::",
sw_if_index,
proto=DpoProto.DPO_PROTO_IP6)], is_ip6=1)
ip6_via_tunnel.add_vpp_config()
# IPv6 in to IPv4 tunnel
p6 = (p_ether / p_ip6 / p_payload)
p_inner_ip6 = p_ip6
p_inner_ip6.hlim -= 1
p6_reply = (IP(src=self.pg0.local_ip4, dst=self.pg1.remote_ip4,
proto='ipv6', id=0, tos=42) / p_inner_ip6 / p_payload)
p6_reply.ttl -= 1
rx = self.send_and_expect(self.pg0, p6 * 10, self.pg1)
for p in rx:
self.validate(p[1], p6_reply)
# IPv4 in to IPv4 tunnel
p4 = (p_ether / p_ip4 / p_payload)
p_ip4_inner = p_ip4
p_ip4_inner.ttl -= 1
p4_reply = (IP(src=self.pg0.local_ip4, dst=self.pg1.remote_ip4,
tos=42) /
p_ip4_inner / p_payload)
p4_reply.ttl -= 1
p4_reply.id = 0
rx = self.send_and_expect(self.pg0, p4 * 10, self.pg1)
for p in rx:
self.validate(p[1], p4_reply)
# Decapsulation
p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
# IPv4 tunnel to IPv4
p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
p4 = (p_ether / IP(src=self.pg1.remote_ip4,
dst=self.pg0.local_ip4) / p_ip4 / p_payload)
p4_reply = (p_ip4 / p_payload)
p4_reply.ttl -= 1
rx = self.send_and_expect(self.pg1, p4 * 10, self.pg0)
for p in rx:
self.validate(p[1], p4_reply)
err = self.statistics.get_counter(
'/err/ipip4-input/packets decapsulated')
self.assertEqual(err, 10)
# IPv4 tunnel to IPv6
p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6)
p6 = (p_ether / IP(src=self.pg1.remote_ip4,
dst=self.pg0.local_ip4) / p_ip6 / p_payload)
p6_reply = (p_ip6 / p_payload)
p6_reply.hlim = 63
rx = self.send_and_expect(self.pg1, p6 * 10, self.pg0)
for p in rx:
self.validate(p[1], p6_reply)
err = self.statistics.get_counter(
'/err/ipip4-input/packets decapsulated')
self.assertEqual(err, 20)
#
# Fragmentation / Reassembly and Re-fragmentation
#
rv = self.vapi.ip_reassembly_enable_disable(
sw_if_index=self.pg1.sw_if_index,
enable_ip4=1)
self.vapi.ip_reassembly_set(timeout_ms=1000, max_reassemblies=1000,
max_reassembly_length=1000,
expire_walk_interval_ms=10000,
is_ip6=0)
# Send lots of fragments, verify reassembled packet
frags, p4_reply = self.generate_ip4_frags(3131, 1400)
f = []
for i in range(0, 1000):
f.extend(frags)
self.pg1.add_stream(f)
self.pg_enable_capture()
self.pg_start()
rx = self.pg0.get_capture(1000)
for p in rx:
self.validate(p[1], p4_reply)
err = self.statistics.get_counter(
'/err/ipip4-input/packets decapsulated')
self.assertEqual(err, 1020)
f = []
r = []
for i in range(1, 90):
frags, p4_reply = self.generate_ip4_frags(i * 100, 1000)
f.extend(frags)
r.extend(p4_reply)
self.pg_enable_capture()
self.pg1.add_stream(f)
self.pg_start()
rx = self.pg0.get_capture(89)
i = 0
for p in rx:
self.validate(p[1], r[i])
i += 1
# Now try with re-fragmentation
#
# Send fragments to tunnel head-end, for the tunnel head end
# to reassemble and then refragment
#
self.vapi.sw_interface_set_mtu(self.pg0.sw_if_index, [576, 0, 0, 0])
frags, p4_reply = self.generate_ip4_frags(3123, 1200)
self.pg_enable_capture()
self.pg1.add_stream(frags)
self.pg_start()
rx = self.pg0.get_capture(6)
reass_pkt = reassemble4(rx)
p4_reply.ttl -= 1
p4_reply.id = 256
self.validate(reass_pkt, p4_reply)
self.vapi.sw_interface_set_mtu(self.pg0.sw_if_index, [1600, 0, 0, 0])
frags, p4_reply = self.generate_ip4_frags(3123, 1200)
self.pg_enable_capture()
self.pg1.add_stream(frags)
self.pg_start()
rx = self.pg0.get_capture(2)
reass_pkt = reassemble4(rx)
p4_reply.ttl -= 1
p4_reply.id = 512
self.validate(reass_pkt, p4_reply)
def test_ipip_create(self):
""" ipip create / delete interface test """
rv = self.vapi.ipip_add_tunnel(
src_address=inet_pton(AF_INET, '1.2.3.4'),
dst_address=inet_pton(AF_INET, '2.3.4.5'), is_ipv6=0)
sw_if_index = rv.sw_if_index
self.vapi.ipip_del_tunnel(sw_if_index)
def test_ipip_vrf_create(self):
""" ipip create / delete interface VRF test """
t = VppIpTable(self, 20)
t.add_vpp_config()
rv = self.vapi.ipip_add_tunnel(
src_address=inet_pton(AF_INET, '1.2.3.4'),
dst_address=inet_pton(AF_INET, '2.3.4.5'), is_ipv6=0,
table_id=20)
sw_if_index = rv.sw_if_index
self.vapi.ipip_del_tunnel(sw_if_index)
def payload(self, len):
return 'x' * len
class TestIPIP6(VppTestCase):
""" IPIP6 Test Case """
@classmethod
def setUpClass(cls):
super(TestIPIP6, cls).setUpClass()
cls.create_pg_interfaces(range(2))
cls.interfaces = list(cls.pg_interfaces)
@classmethod
def tearDownClass(cls):
super(TestIPIP6, cls).tearDownClass()
def setUp(self):
super(TestIPIP6, self).setUp()
for i in self.interfaces:
i.admin_up()
i.config_ip4()
i.config_ip6()
i.disable_ipv6_ra()
i.resolve_arp()
i.resolve_ndp()
self.setup_tunnel()
def tearDown(self):
if not self.vpp_dead:
self.destroy_tunnel()
for i in self.pg_interfaces:
i.unconfig_ip4()
i.unconfig_ip6()
i.admin_down()
super(TestIPIP6, self).tearDown()
def setup_tunnel(self):
# IPv6 transport
rv = self.vapi.ipip_add_tunnel(
src_address=self.pg0.local_ip6n,
dst_address=self.pg1.remote_ip6n, tc_tos=255)
sw_if_index = rv.sw_if_index
self.tunnel_if_index = sw_if_index
self.vapi.sw_interface_set_flags(sw_if_index, 1)
self.vapi.sw_interface_set_unnumbered(
sw_if_index=self.pg0.sw_if_index,
unnumbered_sw_if_index=sw_if_index)
# Add IPv4 and IPv6 routes via tunnel interface
ip4_via_tunnel = VppIpRoute(
self, "130.67.0.0", 16,
[VppRoutePath("0.0.0.0",
sw_if_index,
proto=DpoProto.DPO_PROTO_IP4)], is_ip6=0)
ip4_via_tunnel.add_vpp_config()
ip6_via_tunnel = VppIpRoute(
self, "dead::", 16,
[VppRoutePath("::",
sw_if_index,
proto=DpoProto.DPO_PROTO_IP6)], is_ip6=1)
ip6_via_tunnel.add_vpp_config()
self.tunnel_ip6_via_tunnel = ip6_via_tunnel
self.tunnel_ip4_via_tunnel = ip4_via_tunnel
def destroy_tunnel(self):
# IPv6 transport
self.tunnel_ip4_via_tunnel.remove_vpp_config()
self.tunnel_ip6_via_tunnel.remove_vpp_config()
rv = self.vapi.ipip_del_tunnel(sw_if_index=self.tunnel_if_index)
def validate(self, rx, expected):
self.assertEqual(rx, expected.__class__(expected))
def generate_ip6_frags(self, payload_length, fragment_size):
p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
p_payload = UDP(sport=1234, dport=1234) / self.payload(payload_length)
p_ip6 = IPv6(src="1::1", dst=self.pg0.remote_ip6)
outer_ip6 = (p_ether / IPv6(src=self.pg1.remote_ip6,
dst=self.pg0.local_ip6) /
IPv6ExtHdrFragment() / p_ip6 / p_payload)
frags = fragment6(outer_ip6, fragment_size)
p6_reply = (p_ip6 / p_payload)
p6_reply.hlim -= 1
return frags, p6_reply
def generate_ip6_hairpin_frags(self, payload_length, fragment_size):
p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
p_payload = UDP(sport=1234, dport=1234) / self.payload(payload_length)
p_ip6 = IPv6(src="1::1", dst="dead::1")
outer_ip6 = (p_ether / IPv6(src=self.pg1.remote_ip6,
dst=self.pg0.local_ip6) /
IPv6ExtHdrFragment() / p_ip6 / p_payload)
frags = fragment6(outer_ip6, fragment_size)
p_ip6.hlim -= 1
p6_reply = (IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6,
hlim=63) / p_ip6 / p_payload)
return frags, p6_reply
def test_encap(self):
""" ip{v4,v6} over ip6 test encap """
p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh='UDP')
p_ip4 = IP(src="1.2.3.4", dst="130.67.0.1", tos=42)
p_payload = UDP(sport=1234, dport=1234)
# Encapsulation
# IPv6 in to IPv6 tunnel
p6 = (p_ether / p_ip6 / p_payload)
p6_reply = (IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6,
hlim=64, tc=42) /
p_ip6 / p_payload)
p6_reply[1].hlim -= 1
rx = self.send_and_expect(self.pg0, p6 * 11, self.pg1)
for p in rx:
self.validate(p[1], p6_reply)
# IPv4 in to IPv6 tunnel
p4 = (p_ether / p_ip4 / p_payload)
p4_reply = (IPv6(src=self.pg0.local_ip6,
dst=self.pg1.remote_ip6, hlim=64, tc=42) /
p_ip4 / p_payload)
p4_reply[1].ttl -= 1
rx = self.send_and_expect(self.pg0, p4 * 11, self.pg1)
for p in rx:
self.validate(p[1], p4_reply)
def test_decap(self):
""" ip{v4,v6} over ip6 test decap """
p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh='UDP')
p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
p_payload = UDP(sport=1234, dport=1234)
# Decapsulation
# IPv6 tunnel to IPv4
p4 = (p_ether / IPv6(src=self.pg1.remote_ip6,
dst=self.pg0.local_ip6) / p_ip4 / p_payload)
p4_reply = (p_ip4 / p_payload)
p4_reply.ttl -= 1
rx = self.send_and_expect(self.pg1, p4 * 11, self.pg0)
for p in rx:
self.validate(p[1], p4_reply)
# IPv6 tunnel to IPv6
p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6)
p6 = (p_ether / IPv6(src=self.pg1.remote_ip6,
dst=self.pg0.local_ip6) / p_ip6 / p_payload)
p6_reply = (p_ip6 / p_payload)
p6_reply.hlim = 63
rx = self.send_and_expect(self.pg1, p6 * 11, self.pg0)
for p in rx:
self.validate(p[1], p6_reply)
def test_frag(self):
""" ip{v4,v6} over ip6 test frag """
p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh='UDP')
p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
p_payload = UDP(sport=1234, dport=1234)
#
# Fragmentation / Reassembly and Re-fragmentation
#
rv = self.vapi.ip_reassembly_enable_disable(
sw_if_index=self.pg1.sw_if_index,
enable_ip6=1)
self.vapi.ip_reassembly_set(timeout_ms=1000, max_reassemblies=1000,
max_reassembly_length=1000,
expire_walk_interval_ms=10000,
is_ip6=1)
# Send lots of fragments, verify reassembled packet
before_cnt = self.statistics.get_counter(
'/err/ipip6-input/packets decapsulated')
frags, p6_reply = self.generate_ip6_frags(3131, 1400)
f = []
for i in range(0, 1000):
f.extend(frags)
self.pg1.add_stream(f)
self.pg_enable_capture()
self.pg_start()
rx = self.pg0.get_capture(1000)
for p in rx:
self.validate(p[1], p6_reply)
cnt = self.statistics.get_counter(
'/err/ipip6-input/packets decapsulated')
self.assertEqual(cnt, before_cnt + 1000)
f = []
r = []
# TODO: Check out why reassembly of atomic fragments don't work
for i in range(10, 90):
frags, p6_reply = self.generate_ip6_frags(i * 100, 1000)
f.extend(frags)
r.extend(p6_reply)
self.pg_enable_capture()
self.pg1.add_stream(f)
self.pg_start()
rx = self.pg0.get_capture(80)
i = 0
for p in rx:
self.validate(p[1], r[i])
i += 1
# Simple fragmentation
p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [1280, 0, 0, 0])
# IPv6 in to IPv6 tunnel
p_payload = UDP(sport=1234, dport=1234) / self.payload(1300)
p6 = (p_ether / p_ip6 / p_payload)
p6_reply = (IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6,
hlim=63, tc=42) /
p_ip6 / p_payload)
p6_reply[1].hlim -= 1
self.pg_enable_capture()
self.pg0.add_stream(p6)
self.pg_start()
rx = self.pg1.get_capture(2)
# Scapy defragment doesn't deal well with multiple layers
# of same type / Ethernet header first
f = [p[1] for p in rx]
reass_pkt = defragment6(f)
self.validate(reass_pkt, p6_reply)
# Now try with re-fragmentation
#
# Send large fragments to tunnel head-end, for the tunnel head end
# to reassemble and then refragment out the tunnel again.
# Hair-pinning
#
self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [1280, 0, 0, 0])
frags, p6_reply = self.generate_ip6_hairpin_frags(8000, 1200)
self.pg_enable_capture()
self.pg1.add_stream(frags)
self.pg_start()
rx = self.pg1.get_capture(7)
f = [p[1] for p in rx]
reass_pkt = defragment6(f)
p6_reply.id = 256
self.validate(reass_pkt, p6_reply)
def test_ipip_create(self):
""" ipip create / delete interface test """
rv = self.vapi.ipip_add_tunnel(
src_address=inet_pton(AF_INET, '1.2.3.4'),
dst_address=inet_pton(AF_INET, '2.3.4.5'), is_ipv6=0)
sw_if_index = rv.sw_if_index
self.vapi.ipip_del_tunnel(sw_if_index)
def test_ipip_vrf_create(self):
""" ipip create / delete interface VRF test """
t = VppIpTable(self, 20)
t.add_vpp_config()
rv = self.vapi.ipip_add_tunnel(
src_address=inet_pton(AF_INET, '1.2.3.4'),
dst_address=inet_pton(AF_INET, '2.3.4.5'), is_ipv6=0,
table_id=20)
sw_if_index = rv.sw_if_index
self.vapi.ipip_del_tunnel(sw_if_index)
def payload(self, len):
return 'x' * len
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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