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c520dcb49fa07d30de4944344b66fc325b44f17d
vpp/test/test_udp.py
Mauro Sardara 9539647b89 udp: fix inner packet checksum calculation in udp-encap 
When computing the inner packet checksum, the code wrongly
assumes that the IP version of the inner packet is the
same of the outer one. On the contrary, it is perfectly
possible to encapsulate v6 packets into v4 and viceversa,
so we need to check the IP format of the inner header before
calling vnet_calc_checksums_inline.

Ticket: VPP-2020
Type: fix

Signed-off-by: Mauro Sardara <msardara@cisco.com>
Change-Id: Ia4515563c164f6dd5096832c831a48cb0a29b3ad
Signed-off-by: Mauro Sardara <msardara@cisco.com>
2022-03-30 17:51:33 +00:00

480 lines
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#!/usr/bin/env python3
import unittest
from framework import tag_fixme_vpp_workers
from framework import VppTestCase, VppTestRunner
from vpp_udp_encap import find_udp_encap, VppUdpEncap
from vpp_udp_decap import VppUdpDecap
from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable, VppMplsLabel, \
VppMplsTable, VppMplsRoute, FibPathType, FibPathProto
from vpp_neighbor import VppNeighbor
from vpp_papi import VppEnum
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP, ICMP
from scapy.layers.inet6 import IPv6
from scapy.contrib.mpls import MPLS
NUM_PKTS = 67
@tag_fixme_vpp_workers
class TestUdpEncap(VppTestCase):
""" UDP Encap Test Case """
@classmethod
def setUpClass(cls):
super(TestUdpEncap, cls).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestUdpEncap, cls).tearDownClass()
def setUp(self):
super(TestUdpEncap, self).setUp()
# create 2 pg interfaces
self.create_pg_interfaces(range(4))
# setup interfaces
# assign them different tables.
table_id = 0
self.tables = []
for i in self.pg_interfaces:
i.admin_up()
if table_id != 0:
tbl = VppIpTable(self, table_id)
tbl.add_vpp_config()
self.tables.append(tbl)
tbl = VppIpTable(self, table_id, is_ip6=1)
tbl.add_vpp_config()
self.tables.append(tbl)
i.set_table_ip4(table_id)
i.set_table_ip6(table_id)
i.config_ip4()
i.resolve_arp()
i.config_ip6()
i.resolve_ndp()
table_id += 1
def tearDown(self):
for i in self.pg_interfaces:
i.unconfig_ip4()
i.unconfig_ip6()
i.set_table_ip4(0)
i.set_table_ip6(0)
i.admin_down()
super(TestUdpEncap, self).tearDown()
def validate_outer4(self, rx, encap_obj):
self.assertEqual(rx[IP].src, encap_obj.src_ip_s)
self.assertEqual(rx[IP].dst, encap_obj.dst_ip_s)
self.assertEqual(rx[UDP].sport, encap_obj.src_port)
self.assertEqual(rx[UDP].dport, encap_obj.dst_port)
def validate_outer6(self, rx, encap_obj):
self.assertEqual(rx[IPv6].src, encap_obj.src_ip_s)
self.assertEqual(rx[IPv6].dst, encap_obj.dst_ip_s)
self.assertEqual(rx[UDP].sport, encap_obj.src_port)
self.assertEqual(rx[UDP].dport, encap_obj.dst_port)
def validate_inner4(self, rx, tx, ttl=None):
self.assertEqual(rx[IP].src, tx[IP].src)
self.assertEqual(rx[IP].dst, tx[IP].dst)
if ttl:
self.assertEqual(rx[IP].ttl, ttl)
else:
self.assertEqual(rx[IP].ttl, tx[IP].ttl)
def validate_inner6(self, rx, tx, hlim=None):
self.assertEqual(rx.src, tx[IPv6].src)
self.assertEqual(rx.dst, tx[IPv6].dst)
if hlim:
self.assertEqual(rx.hlim, hlim)
else:
self.assertEqual(rx.hlim, tx[IPv6].hlim)
def test_udp_encap(self):
""" UDP Encap test
"""
#
# construct a UDP encap object through each of the peers
# v4 through the first two peers, v6 through the second.
#
udp_encap_0 = VppUdpEncap(self,
self.pg0.local_ip4,
self.pg0.remote_ip4,
330, 440)
udp_encap_1 = VppUdpEncap(self,
self.pg1.local_ip4,
self.pg1.remote_ip4,
331, 441,
table_id=1)
udp_encap_2 = VppUdpEncap(self,
self.pg2.local_ip6,
self.pg2.remote_ip6,
332, 442,
table_id=2)
udp_encap_3 = VppUdpEncap(self,
self.pg3.local_ip6,
self.pg3.remote_ip6,
333, 443,
table_id=3)
udp_encap_0.add_vpp_config()
udp_encap_1.add_vpp_config()
udp_encap_2.add_vpp_config()
udp_encap_3.add_vpp_config()
self.logger.info(self.vapi.cli("sh udp encap"))
self.assertTrue(find_udp_encap(self, udp_encap_2))
self.assertTrue(find_udp_encap(self, udp_encap_3))
self.assertTrue(find_udp_encap(self, udp_encap_0))
self.assertTrue(find_udp_encap(self, udp_encap_1))
#
# Routes via each UDP encap object - all combinations of v4 and v6.
#
route_4o4 = VppIpRoute(
self, "1.1.0.1", 24,
[VppRoutePath("0.0.0.0",
0xFFFFFFFF,
type=FibPathType.FIB_PATH_TYPE_UDP_ENCAP,
next_hop_id=udp_encap_0.id,
proto=FibPathProto.FIB_PATH_NH_PROTO_IP4)],
table_id=1)
route_4o6 = VppIpRoute(
self, "1.1.2.1", 32,
[VppRoutePath("0.0.0.0",
0xFFFFFFFF,
type=FibPathType.FIB_PATH_TYPE_UDP_ENCAP,
next_hop_id=udp_encap_2.id,
proto=FibPathProto.FIB_PATH_NH_PROTO_IP4)])
route_6o4 = VppIpRoute(
self, "2001::1", 128,
[VppRoutePath("0.0.0.0",
0xFFFFFFFF,
type=FibPathType.FIB_PATH_TYPE_UDP_ENCAP,
next_hop_id=udp_encap_1.id,
proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)])
route_6o6 = VppIpRoute(
self, "2001::3", 128,
[VppRoutePath("0.0.0.0",
0xFFFFFFFF,
type=FibPathType.FIB_PATH_TYPE_UDP_ENCAP,
next_hop_id=udp_encap_3.id,
proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)])
route_4o6.add_vpp_config()
route_6o6.add_vpp_config()
route_6o4.add_vpp_config()
route_4o4.add_vpp_config()
#
# 4o4 encap
#
p_4o4 = (Ether(src=self.pg1.remote_mac,
dst=self.pg1.local_mac) /
IP(src="2.2.2.2", dst="1.1.0.1") /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100))
rx = self.send_and_expect(self.pg1, p_4o4*NUM_PKTS, self.pg0)
for p in rx:
self.validate_outer4(p, udp_encap_0)
p = IP(p["UDP"].payload.load)
self.validate_inner4(p, p_4o4)
self.assertEqual(udp_encap_0.get_stats()['packets'], NUM_PKTS)
#
# 4o6 encap
#
p_4o6 = (Ether(src=self.pg0.remote_mac,
dst=self.pg0.local_mac) /
IP(src="2.2.2.2", dst="1.1.2.1") /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100))
rx = self.send_and_expect(self.pg0, p_4o6*NUM_PKTS, self.pg2)
for p in rx:
self.validate_outer6(p, udp_encap_2)
p = IP(p["UDP"].payload.load)
self.validate_inner4(p, p_4o6)
self.assertEqual(udp_encap_2.get_stats()['packets'], NUM_PKTS)
#
# 6o4 encap
#
p_6o4 = (Ether(src=self.pg0.remote_mac,
dst=self.pg0.local_mac) /
IPv6(src="2001::100", dst="2001::1") /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100))
rx = self.send_and_expect(self.pg0, p_6o4*NUM_PKTS, self.pg1)
for p in rx:
self.validate_outer4(p, udp_encap_1)
p = IPv6(p["UDP"].payload.load)
self.validate_inner6(p, p_6o4)
self.assertEqual(udp_encap_1.get_stats()['packets'], NUM_PKTS)
#
# 6o6 encap
#
p_6o6 = (Ether(src=self.pg0.remote_mac,
dst=self.pg0.local_mac) /
IPv6(src="2001::100", dst="2001::3") /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100))
rx = self.send_and_expect(self.pg0, p_6o6*NUM_PKTS, self.pg3)
for p in rx:
self.validate_outer6(p, udp_encap_3)
p = IPv6(p["UDP"].payload.load)
self.validate_inner6(p, p_6o6)
self.assertEqual(udp_encap_3.get_stats()['packets'], NUM_PKTS)
#
# A route with an output label
# the TTL of the inner packet is decremented on LSP ingress
#
route_4oMPLSo4 = VppIpRoute(
self, "1.1.2.22", 32,
[VppRoutePath("0.0.0.0",
0xFFFFFFFF,
type=FibPathType.FIB_PATH_TYPE_UDP_ENCAP,
next_hop_id=1,
labels=[VppMplsLabel(66)])])
route_4oMPLSo4.add_vpp_config()
p_4omo4 = (Ether(src=self.pg0.remote_mac,
dst=self.pg0.local_mac) /
IP(src="2.2.2.2", dst="1.1.2.22") /
UDP(sport=1234, dport=1234) /
Raw(b'\xa5' * 100))
rx = self.send_and_expect(self.pg0, p_4omo4*NUM_PKTS, self.pg1)
for p in rx:
self.validate_outer4(p, udp_encap_1)
p = MPLS(p["UDP"].payload.load)
self.validate_inner4(p, p_4omo4, ttl=63)
self.assertEqual(udp_encap_1.get_stats()['packets'], 2*NUM_PKTS)
def test_udp_decap(self):
""" UDP Decap test
"""
#
# construct a UDP decap object for each type of protocol
#
# IPv4
udp_api_proto = VppEnum.vl_api_udp_decap_next_proto_t
next_proto = udp_api_proto.UDP_API_DECAP_PROTO_IP4
udp_decap_0 = VppUdpDecap(self, 1, 220, next_proto)
# IPv6
next_proto = udp_api_proto.UDP_API_DECAP_PROTO_IP6
udp_decap_1 = VppUdpDecap(self, 0, 221, next_proto)
# MPLS
next_proto = udp_api_proto.UDP_API_DECAP_PROTO_MPLS
udp_decap_2 = VppUdpDecap(self, 1, 222, next_proto)
udp_decap_0.add_vpp_config()
udp_decap_1.add_vpp_config()
udp_decap_2.add_vpp_config()
#
# Routes via the corresponding pg after the UDP decap
#
route_4 = VppIpRoute(
self, "1.1.1.1", 32,
[VppRoutePath("0.0.0.0", self.pg0.sw_if_index)],
table_id=0)
route_6 = VppIpRoute(
self, "2001::1", 128,
[VppRoutePath("::", self.pg1.sw_if_index)],
table_id=1)
route_mo4 = VppIpRoute(
self, "3.3.3.3", 32,
[VppRoutePath("0.0.0.0", self.pg2.sw_if_index)],
table_id=2)
route_4.add_vpp_config()
route_6.add_vpp_config()
route_mo4.add_vpp_config()
#
# Adding neighbors to route the packets
#
n_4 = VppNeighbor(self,
self.pg0.sw_if_index,
"00:11:22:33:44:55",
"1.1.1.1")
n_6 = VppNeighbor(self,
self.pg1.sw_if_index,
"11:22:33:44:55:66",
"2001::1")
n_mo4 = VppNeighbor(self,
self.pg2.sw_if_index,
"22:33:44:55:66:77",
"3.3.3.3")
n_4.add_vpp_config()
n_6.add_vpp_config()
n_mo4.add_vpp_config()
#
# MPLS decapsulation config
#
mpls_table = VppMplsTable(self, 0)
mpls_table.add_vpp_config()
mpls_route = VppMplsRoute(
self, 77, 1,
[VppRoutePath("0.0.0.0",
0xFFFFFFFF,
nh_table_id=2,
proto=FibPathProto.FIB_PATH_NH_PROTO_IP4)])
mpls_route.add_vpp_config()
#
# UDP over ipv4 decap
#
p_4 = (Ether(src=self.pg0.remote_mac,
dst=self.pg0.local_mac) /
IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
UDP(sport=1111, dport=220) /
IP(src="2.2.2.2", dst="1.1.1.1") /
UDP(sport=1234, dport=4321) /
Raw(b'\xa5' * 100))
rx = self.send_and_expect(self.pg0, p_4*NUM_PKTS, self.pg0)
p_4 = IP(p_4["UDP"].payload)
for p in rx:
p = IP(p["Ether"].payload)
self.validate_inner4(p, p_4, ttl=63)
#
# UDP over ipv6 decap
#
p_6 = (Ether(src=self.pg1.remote_mac,
dst=self.pg1.local_mac) /
IPv6(src=self.pg1.remote_ip6, dst=self.pg1.local_ip6) /
UDP(sport=2222, dport=221) /
IPv6(src="2001::100", dst="2001::1") /
UDP(sport=1234, dport=4321) /
Raw(b'\xa5' * 100))
rx = self.send_and_expect(self.pg1, p_6*NUM_PKTS, self.pg1)
p_6 = IPv6(p_6["UDP"].payload)
p = IPv6(rx[0]["Ether"].payload)
for p in rx:
p = IPv6(p["Ether"].payload)
self.validate_inner6(p, p_6, hlim=63)
#
# UDP over mpls decap
#
p_mo4 = (Ether(src=self.pg2.remote_mac,
dst=self.pg2.local_mac) /
IP(src=self.pg2.remote_ip4, dst=self.pg2.local_ip4) /
UDP(sport=3333, dport=222) /
MPLS(label=77, ttl=1) /
IP(src="4.4.4.4", dst="3.3.3.3") /
UDP(sport=1234, dport=4321) /
Raw(b'\xa5' * 100))
self.pg2.enable_mpls()
rx = self.send_and_expect(self.pg2, p_mo4*NUM_PKTS, self.pg2)
self.pg2.disable_mpls()
p_mo4 = IP(MPLS(p_mo4["UDP"].payload).payload)
for p in rx:
p = IP(p["Ether"].payload)
self.validate_inner4(p, p_mo4, ttl=63)
@tag_fixme_vpp_workers
class TestUDP(VppTestCase):
""" UDP Test Case """
@classmethod
def setUpClass(cls):
super(TestUDP, cls).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestUDP, cls).tearDownClass()
def setUp(self):
super(TestUDP, self).setUp()
self.vapi.session_enable_disable(is_enable=1)
self.create_loopback_interfaces(2)
table_id = 0
for i in self.lo_interfaces:
i.admin_up()
if table_id != 0:
tbl = VppIpTable(self, table_id)
tbl.add_vpp_config()
i.set_table_ip4(table_id)
i.config_ip4()
table_id += 1
# Configure namespaces
self.vapi.app_namespace_add_del(namespace_id="0",
sw_if_index=self.loop0.sw_if_index)
self.vapi.app_namespace_add_del(namespace_id="1",
sw_if_index=self.loop1.sw_if_index)
def tearDown(self):
for i in self.lo_interfaces:
i.unconfig_ip4()
i.set_table_ip4(0)
i.admin_down()
self.vapi.session_enable_disable(is_enable=0)
super(TestUDP, self).tearDown()
def test_udp_transfer(self):
""" UDP echo client/server transfer """
# Add inter-table routes
ip_t01 = VppIpRoute(self, self.loop1.local_ip4, 32,
[VppRoutePath("0.0.0.0",
0xffffffff,
nh_table_id=1)])
ip_t10 = VppIpRoute(self, self.loop0.local_ip4, 32,
[VppRoutePath("0.0.0.0",
0xffffffff,
nh_table_id=0)], table_id=1)
ip_t01.add_vpp_config()
ip_t10.add_vpp_config()
# Start builtin server and client
uri = "udp://" + self.loop0.local_ip4 + "/1234"
error = self.vapi.cli("test echo server appns 0 fifo-size 4 no-echo" +
"uri " + uri)
if error:
self.logger.critical(error)
self.assertNotIn("failed", error)
error = self.vapi.cli("test echo client mbytes 10 appns 1 " +
"fifo-size 4 no-output test-bytes " +
"syn-timeout 2 no-return uri " + uri)
if error:
self.logger.critical(error)
self.assertNotIn("failed", error)
self.logger.debug(self.vapi.cli("show session verbose 2"))
# Delete inter-table routes
ip_t01.remove_vpp_config()
ip_t10.remove_vpp_config()
if __name__ == '__main__':
unittest.main(testRunner=VppTestRunner)
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