--- /dev/null
+#!/usr/bin/env python3
+
+import unittest
+
+from framework import VppTestCase, VppTestRunner
+
+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 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)
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