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#!/usr/bin/env python3
import unittest
from framework import VppTestCase
from asfframework import VppTestRunner
from scapy.packet import Raw
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6
from vpp_papi import VppEnum
N_PKTS = 63
class TestURPF(VppTestCase):
"""Unicast Reverse Path Forwarding Test Case"""
@classmethod
def setUpClass(cls):
super(TestURPF, cls).setUpClass()
@classmethod
def tearDownClass(cls):
super(TestURPF, cls).tearDownClass()
def setUp(self):
super(TestURPF, self).setUp()
# create 4 pg interfaces so there are a few addresses
# in the FIB
self.create_pg_interfaces(range(4))
for i in self.pg_interfaces:
i.admin_up()
i.config_ip4()
i.resolve_arp()
i.config_ip6()
i.resolve_ndp()
def tearDown(self):
for i in self.pg_interfaces:
i.unconfig_ip4()
i.unconfig_ip6()
i.admin_down()
super(TestURPF, self).tearDown()
def test_urpf4(self):
"""uRPF IP4"""
e = VppEnum
p_spoof_loose = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src="3.3.3.3", dst=self.pg1.remote_ip4)
/ UDP(sport=1234, dport=1234)
/ Raw(b"\xa5" * 100)
) * N_PKTS
p_spoof_strict = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=self.pg2.remote_ip4, dst=self.pg1.remote_ip4)
/ UDP(sport=1234, dport=1234)
/ Raw(b"\xa5" * 100)
) * N_PKTS
p_good = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=self.pg0.remote_ip4, dst=self.pg1.remote_ip4)
/ UDP(sport=1234, dport=1234)
/ Raw(b"\xa5" * 100)
) * N_PKTS
#
# before adding the uRPF, ensure all packets are forwarded
#
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_expect(self.pg0, p_spoof_loose, self.pg1)
#
# apply loose uRPF check on pg0 rx
#
self.vapi.urpf_update(
is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg0.sw_if_index,
)
# good packets still pass
self.send_and_expect(self.pg0, p_good, self.pg1)
# packets from address for which there is a route are forwarded
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
# packets from address to which there is no route are dropped
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip4-rx-urpf-loose/uRPF Drop", N_PKTS)
#
# crank it up to strict mode
#
self.vapi.urpf_update(
is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg0.sw_if_index,
)
# good packets still pass
self.send_and_expect(self.pg0, p_good, self.pg1)
# packets that would not be routed back thru pg0 are dropped
self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip4-rx-urpf-strict/uRPF Drop", 2 * N_PKTS)
#
# disable uRPF, all traffic should pass
#
self.vapi.urpf_update(
is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg0.sw_if_index,
)
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_expect(self.pg0, p_spoof_loose, self.pg1)
#
# Now apply in the TX direction
# for loose it is the same deal, they should not be forwarded
# if there's no route
# for strict they should not be forwarded if they would be
# forwarded thru that interface.
#
self.vapi.urpf_update(
is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg1.sw_if_index,
)
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip4-tx-urpf-loose/uRPF Drop", N_PKTS)
self.vapi.urpf_update(
is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg1.sw_if_index,
)
self.send_and_expect(self.pg0, p_good, self.pg1)
# the strict packet, from a peer is allowed, since it does
# not forward via pg1
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip4-tx-urpf-strict/uRPF Drop", N_PKTS)
# change the strict packet so that it would forward through pg1
p_spoof_strict = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP(src=self.pg1.remote_ip4, dst=self.pg1.remote_ip4)
/ UDP(sport=1234, dport=1234)
/ Raw(b"\xa5" * 100)
) * N_PKTS
self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
self.assert_error_counter_equal("/err/ip4-tx-urpf-strict/uRPF Drop", 2 * N_PKTS)
# cleanup
self.vapi.urpf_update(
is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
af=e.vl_api_address_family_t.ADDRESS_IP4,
sw_if_index=self.pg1.sw_if_index,
)
def test_urpf6(self):
"""uRPF IP6"""
e = VppEnum
p_spoof_loose = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IPv6(src="3::3", dst=self.pg1.remote_ip6)
/ UDP(sport=1236, dport=1236)
/ Raw(b"\xa5" * 100)
) * N_PKTS
p_spoof_strict = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IPv6(src=self.pg2.remote_ip6, dst=self.pg1.remote_ip6)
/ UDP(sport=1236, dport=1236)
/ Raw(b"\xa5" * 100)
) * N_PKTS
p_good = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IPv6(src=self.pg0.remote_ip6, dst=self.pg1.remote_ip6)
/ UDP(sport=1236, dport=1236)
/ Raw(b"\xa5" * 100)
) * N_PKTS
#
# before adding the uRPF, ensure all packets are forwarded
#
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_expect(self.pg0, p_spoof_loose, self.pg1)
#
# apply loose uRPF check on pg0 rx
#
self.vapi.urpf_update(
is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg0.sw_if_index,
)
# good packets still pass
self.send_and_expect(self.pg0, p_good, self.pg1)
# packets from address for which there is a route are forwarded
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
# packets from address to which there is no route are dropped
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip6-rx-urpf-loose/uRPF Drop", N_PKTS)
#
# crank it up to strict mode
#
self.vapi.urpf_update(
is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg0.sw_if_index,
)
# good packets still pass
self.send_and_expect(self.pg0, p_good, self.pg1)
# packets that would not be routed back thru pg0 are dropped
self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip6-rx-urpf-strict/uRPF Drop", 2 * N_PKTS)
#
# disable uRPF, all traffic should pass
#
self.vapi.urpf_update(
is_input=True,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg0.sw_if_index,
)
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_expect(self.pg0, p_spoof_loose, self.pg1)
#
# Now apply in the TX direction
# for loose it is the same deal, they should not be forwarded
# if there's no route
# for strict they should not be forwarded if they would be
# forwarded thru that interface.
#
self.vapi.urpf_update(
is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_LOOSE,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg1.sw_if_index,
)
self.send_and_expect(self.pg0, p_good, self.pg1)
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip6-tx-urpf-loose/uRPF Drop", N_PKTS)
self.vapi.urpf_update(
is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_STRICT,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg1.sw_if_index,
)
self.send_and_expect(self.pg0, p_good, self.pg1)
# the strict packet, from a peer is allowed, since it does
# not forward via pg1
self.send_and_expect(self.pg0, p_spoof_strict, self.pg1)
self.send_and_assert_no_replies(self.pg0, p_spoof_loose)
self.assert_error_counter_equal("/err/ip6-tx-urpf-strict/uRPF Drop", N_PKTS)
# change the strict packet so that it would forward through pg1
p_spoof_strict = (
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IPv6(src=self.pg1.remote_ip6, dst=self.pg1.remote_ip6)
/ UDP(sport=1236, dport=1236)
/ Raw(b"\xa5" * 100)
) * N_PKTS
self.send_and_assert_no_replies(self.pg0, p_spoof_strict)
self.assert_error_counter_equal("/err/ip6-tx-urpf-strict/uRPF Drop", 2 * N_PKTS)
# cleanup
self.vapi.urpf_update(
is_input=False,
mode=e.vl_api_urpf_mode_t.URPF_API_MODE_OFF,
af=e.vl_api_address_family_t.ADDRESS_IP6,
sw_if_index=self.pg1.sw_if_index,
)
if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)
|
