#!/usr/bin/env python3 """IP{4,6} over IP{v,6} tunnel functional tests""" import unittest from scapy.layers.inet6 import IPv6, Ether, IP, UDP, IPv6ExtHdrFragment, Raw 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, FibPathProto from vpp_ipip_tun_interface import VppIpIpTunInterface from vpp_papi import VppEnum from socket import AF_INET, AF_INET6, inet_pton from util import reassemble4 """ Testipip is a subclass of VPPTestCase classes. IPIP tests. """ def ipip_add_tunnel(test, src, dst, table_id=0, dscp=0x0, flags=0): """ Add a IPIP tunnel """ return test.vapi.ipip_add_tunnel( tunnel={ 'src': src, 'dst': dst, 'table_id': table_id, 'instance': 0xffffffff, 'dscp': dscp, 'flags': flags } ) # the number of packets to send when injecting traffic. # a multiple of 8 minus one, so we test all by 8/4/2/1 loops N_PACKETS = 64 - 1 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 verify_ip4ip4_encaps(self, a, p_ip4s, p_ip4_encaps): for i, p_ip4 in enumerate(p_ip4s): p_ip4.dst = a p4 = (self.p_ether / p_ip4 / self.p_payload) p_ip4_inner = p_ip4 p_ip4_inner.ttl -= 1 p4_reply = (p_ip4_encaps[i] / p_ip4_inner / self.p_payload) p4_reply.ttl -= 1 p4_reply.id = 0 rx = self.send_and_expect(self.pg0, p4 * N_PACKETS, self.pg1) for p in rx: self.validate(p[1], p4_reply) self.assert_packet_checksums_valid(p) def verify_ip6ip4_encaps(self, a, p_ip6s, p_ip4_encaps): for i, p_ip6 in enumerate(p_ip6s): p_ip6.dst = a p6 = (self.p_ether / p_ip6 / self.p_payload) p_inner_ip6 = p_ip6 p_inner_ip6.hlim -= 1 p6_reply = (p_ip4_encaps[i] / p_inner_ip6 / self.p_payload) p6_reply.ttl -= 1 rx = self.send_and_expect(self.pg0, p6 * N_PACKETS, self.pg1) for p in rx: self.validate(p[1], p6_reply) self.assert_packet_checksums_valid(p) def test_ipip4(self): """ ip{v4,v6} over ip4 test """ self.pg1.generate_remote_hosts(5) self.pg1.configure_ipv4_neighbors() e = VppEnum.vl_api_tunnel_encap_decap_flags_t d = VppEnum.vl_api_ip_dscp_t self.p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) self.p_payload = UDP(sport=1234, dport=1234) / Raw(b'X' * 100) # create a TOS byte by shifting a DSCP code point 2 bits. those 2 bits # are for the ECN. dscp = d.IP_API_DSCP_AF31 << 2 ecn = 3 dscp_ecn = d.IP_API_DSCP_AF31 << 2 | ecn # IPv4 transport that copies the DCSP from the payload tun_dscp = VppIpIpTunInterface( self, self.pg0, self.pg0.local_ip4, self.pg1.remote_hosts[0].ip4, flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP) tun_dscp.add_vpp_config() # IPv4 transport that copies the DCSP and ECN from the payload tun_dscp_ecn = VppIpIpTunInterface( self, self.pg0, self.pg0.local_ip4, self.pg1.remote_hosts[1].ip4, flags=(e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP | e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN)) tun_dscp_ecn.add_vpp_config() # IPv4 transport that copies the ECN from the payload and sets the # DF bit on encap. copies the ECN on decap tun_ecn = VppIpIpTunInterface( self, self.pg0, self.pg0.local_ip4, self.pg1.remote_hosts[2].ip4, flags=(e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN | e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_SET_DF | e.TUNNEL_API_ENCAP_DECAP_FLAG_DECAP_COPY_ECN)) tun_ecn.add_vpp_config() # IPv4 transport that sets a fixed DSCP in the encap and copies # the DF bit tun = VppIpIpTunInterface( self, self.pg0, self.pg0.local_ip4, self.pg1.remote_hosts[3].ip4, dscp=d.IP_API_DSCP_AF11, flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DF) tun.add_vpp_config() # array of all the tunnels tuns = [tun_dscp, tun_dscp_ecn, tun_ecn, tun] # addresses for prefixes routed via each tunnel a4s = ["" for i in range(len(tuns))] a6s = ["" for i in range(len(tuns))] # IP headers with each combination of DSCp/ECN tested p_ip6s = [IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=dscp), IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=dscp_ecn), IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=ecn), IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=0xff)] p_ip4s = [IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp, flags='DF'), IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp_ecn), IP(src="1.2.3.4", dst="130.67.0.1", tos=ecn), IP(src="1.2.3.4", dst="130.67.0.1", tos=0xff)] # Configure each tunnel for i, t in enumerate(tuns): # Set interface up and enable IP on it self.vapi.sw_interface_set_flags(t.sw_if_index, 1) self.vapi.sw_interface_set_unnumbered( sw_if_index=self.pg0.sw_if_index, unnumbered_sw_if_index=t.sw_if_index) # prefix for route / destination address for packets a4s[i] = "130.67.%d.0" % i a6s[i] = "dead:%d::" % i # Add IPv4 and IPv6 routes via tunnel interface ip4_via_tunnel = VppIpRoute( self, a4s[i], 24, [VppRoutePath("0.0.0.0", t.sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP4)]) ip4_via_tunnel.add_vpp_config() ip6_via_tunnel = VppIpRoute( self, a6s[i], 64, [VppRoutePath("::", t.sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)]) ip6_via_tunnel.add_vpp_config() # # Encapsulation # # tun_dscp copies only the dscp # expected TC values are thus only the DCSP value is present from the # inner exp_tcs = [dscp, dscp, 0, 0xfc] p_ip44_encaps = [IP(src=self.pg0.local_ip4, dst=tun_dscp.dst, tos=tc) for tc in exp_tcs] p_ip64_encaps = [IP(src=self.pg0.local_ip4, dst=tun_dscp.dst, proto='ipv6', id=0, tos=tc) for tc in exp_tcs] # IPv4 in to IPv4 tunnel self.verify_ip4ip4_encaps(a4s[0], p_ip4s, p_ip44_encaps) # IPv6 in to IPv4 tunnel self.verify_ip6ip4_encaps(a6s[0], p_ip6s, p_ip64_encaps) # tun_dscp_ecn copies the dscp and the ecn exp_tcs = [dscp, dscp_ecn, ecn, 0xff] p_ip44_encaps = [IP(src=self.pg0.local_ip4, dst=tun_dscp_ecn.dst, tos=tc) for tc in exp_tcs] p_ip64_encaps = [IP(src=self.pg0.local_ip4, dst=tun_dscp_ecn.dst, proto='ipv6', id=0, tos=tc) for tc in exp_tcs] self.verify_ip4ip4_encaps(a4s[1], p_ip4s, p_ip44_encaps) self.verify_ip6ip4_encaps(a6s[1], p_ip6s, p_ip64_encaps) # tun_ecn copies only the ecn and always sets DF exp_tcs = [0, ecn, ecn, ecn] p_ip44_encaps = [IP(src=self.pg0.local_ip4, dst=tun_ecn.dst, flags='DF', tos=tc) for tc in exp_tcs] p_ip64_encaps = [IP(src=self.pg0.local_ip4, dst=tun_ecn.dst, flags='DF', proto='ipv6', id=0, tos=tc) for tc in exp_tcs] self.verify_ip4ip4_encaps(a4s[2], p_ip4s, p_ip44_encaps) self.verify_ip6ip4_encaps(a6s[2], p_ip6s, p_ip64_encaps) # tun sets a fixed dscp and copies DF fixed_dscp = tun.dscp << 2 flags = ['DF', 0, 0, 0] p_ip44_encaps = [IP(src=self.pg0.local_ip4, dst=tun.dst, flags=f, tos=fixed_dscp) for f in flags] p_ip64_encaps = [IP(src=self.pg0.local_ip4, dst=tun.dst, proto='ipv6', id=0, tos=fixed_dscp) for i in range(len(p_ip4s))] self.verify_ip4ip4_encaps(a4s[3], p_ip4s, p_ip44_encaps) self.verify_ip6ip4_encaps(a6s[3], p_ip6s, p_ip64_encaps) # # Decapsulation # n_packets_decapped = 0 self.p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) # IPv4 tunnel to IPv4 tcs = [0, dscp, dscp_ecn, ecn] # one overlay packet and all combinations of its encap p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4) p_ip4_encaps = [IP(src=tun.dst, dst=self.pg0.local_ip4, tos=tc) for tc in tcs] # for each encap tun will produce the same inner packet because it does # not copy up fields from the payload for p_ip4_encap in p_ip4_encaps: p4 = (self.p_ether / p_ip4_encap / p_ip4 / self.p_payload) p4_reply = (p_ip4 / self.p_payload) p4_reply.ttl -= 1 rx = self.send_and_expect(self.pg1, p4 * N_PACKETS, self.pg0) n_packets_decapped += N_PACKETS for p in rx: self.validate(p[1], p4_reply) self.assert_packet_checksums_valid(p) err = self.statistics.get_err_counter( '/err/ipip4-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) # tun_ecn copies the ECN bits from the encap to the inner p_ip4_encaps = [IP(src=tun_ecn.dst, dst=self.pg0.local_ip4, tos=tc) for tc in tcs] p_ip4_replys = [p_ip4.copy() for i in range(len(p_ip4_encaps))] p_ip4_replys[2].tos = ecn p_ip4_replys[3].tos = ecn for i, p_ip4_encap in enumerate(p_ip4_encaps): p4 = (self.p_ether / p_ip4_encap / p_ip4 / self.p_payload) p4_reply = (p_ip4_replys[i] / self.p_payload) p4_reply.ttl -= 1 rx = self.send_and_expect(self.pg1, p4 * N_PACKETS, self.pg0) n_packets_decapped += N_PACKETS for p in rx: self.validate(p[1], p4_reply) self.assert_packet_checksums_valid(p) err = self.statistics.get_err_counter( '/err/ipip4-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) # IPv4 tunnel to IPv6 # for each encap tun will produce the same inner packet because it does # not copy up fields from the payload p_ip4_encaps = [IP(src=tun.dst, dst=self.pg0.local_ip4, tos=tc) for tc in tcs] p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6) for p_ip4_encap in p_ip4_encaps: p6 = (self.p_ether / p_ip4_encap / p_ip6 / self.p_payload) p6_reply = (p_ip6 / self.p_payload) p6_reply.hlim = 63 rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0) n_packets_decapped += N_PACKETS for p in rx: self.validate(p[1], p6_reply) self.assert_packet_checksums_valid(p) err = self.statistics.get_err_counter( '/err/ipip4-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) # IPv4 tunnel to IPv6 # tun_ecn copies the ECN bits from the encap to the inner p_ip4_encaps = [IP(src=tun_ecn.dst, dst=self.pg0.local_ip4, tos=tc) for tc in tcs] p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6) p_ip6_replys = [p_ip6.copy() for i in range(len(p_ip4_encaps))] p_ip6_replys[2].tc = ecn p_ip6_replys[3].tc = ecn for i, p_ip4_encap in enumerate(p_ip4_encaps): p6 = (self.p_ether / p_ip4_encap / p_ip6 / self.p_payload) p6_reply = (p_ip6_replys[i] / self.p_payload) p6_reply.hlim = 63 rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0) n_packets_decapped += N_PACKETS for p in rx: self.validate(p[1], p6_reply) self.assert_packet_checksums_valid(p) err = self.statistics.get_err_counter( '/err/ipip4-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) # # 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) n_packets_decapped += 1000 for p in rx: self.validate(p[1], p4_reply) err = self.statistics.get_err_counter( '/err/ipip4-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) 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.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.id = 512 self.validate(reass_pkt, p4_reply) # send large packets through the tunnel, expect them to be fragmented self.vapi.sw_interface_set_mtu(tun_dscp.sw_if_index, [600, 0, 0, 0]) p4 = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) / IP(src="1.2.3.4", dst="130.67.0.1", tos=42) / UDP(sport=1234, dport=1234) / Raw(b'Q' * 1000)) rx = self.send_and_expect(self.pg0, p4 * 15, self.pg1, 30) inners = [] for p in rx: inners.append(p[IP].payload) reass_pkt = reassemble4(inners) for p in reass_pkt: self.assert_packet_checksums_valid(p) self.assertEqual(p[IP].ttl, 63) def test_ipip_create(self): """ ipip create / delete interface test """ rv = ipip_add_tunnel(self, '1.2.3.4', '2.3.4.5') 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 = ipip_add_tunnel(self, '1.2.3.4', '2.3.4.5', 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 = ipip_add_tunnel(self, self.pg0.local_ip6, self.pg1.remote_ip6) 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=FibPathProto.FIB_PATH_NH_PROTO_IP4)]) ip4_via_tunnel.add_vpp_config() ip6_via_tunnel = VppIpRoute( self, "dead::", 16, [VppRoutePath("::", sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)]) 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) / 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) / 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 verify_ip4ip6_encaps(self, a, p_ip4s, p_ip6_encaps): for i, p_ip4 in enumerate(p_ip4s): p_ip4.dst = a p4 = (self.p_ether / p_ip4 / self.p_payload) p_ip4_inner = p_ip4 p_ip4_inner.ttl -= 1 p6_reply = (p_ip6_encaps[i] / p_ip4_inner / self.p_payload) rx = self.send_and_expect(self.pg0, p4 * N_PACKETS, self.pg1) for p in rx: self.validate(p[1], p6_reply) self.assert_packet_checksums_valid(p) def verify_ip6ip6_encaps(self, a, p_ip6s, p_ip6_encaps): for i, p_ip6 in enumerate(p_ip6s): p_ip6.dst = a p6 = (self.p_ether / p_ip6 / self.p_payload) p_inner_ip6 = p_ip6 p_inner_ip6.hlim -= 1 p6_reply = (p_ip6_encaps[i] / p_inner_ip6 / self.p_payload) rx = self.send_and_expect(self.pg0, p6 * N_PACKETS, self.pg1) for p in rx: self.validate(p[1], p6_reply) self.assert_packet_checksums_valid(p) def test_ipip6(self): """ ip{v4,v6} over ip6 test """ # that's annoying self.destroy_tunnel() self.pg1.generate_remote_hosts(5) self.pg1.configure_ipv6_neighbors() e = VppEnum.vl_api_tunnel_encap_decap_flags_t d = VppEnum.vl_api_ip_dscp_t self.p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) self.p_payload = UDP(sport=1234, dport=1234) / Raw(b'X' * 100) # create a TOS byte by shifting a DSCP code point 2 bits. those 2 bits # are for the ECN. dscp = d.IP_API_DSCP_AF31 << 2 ecn = 3 dscp_ecn = d.IP_API_DSCP_AF31 << 2 | ecn # IPv4 transport that copies the DCSP from the payload tun_dscp = VppIpIpTunInterface( self, self.pg0, self.pg0.local_ip6, self.pg1.remote_hosts[0].ip6, flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP) tun_dscp.add_vpp_config() # IPv4 transport that copies the DCSP and ECN from the payload tun_dscp_ecn = VppIpIpTunInterface( self, self.pg0, self.pg0.local_ip6, self.pg1.remote_hosts[1].ip6, flags=(e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP | e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN)) tun_dscp_ecn.add_vpp_config() # IPv4 transport that copies the ECN from the payload and sets the # DF bit on encap. copies the ECN on decap tun_ecn = VppIpIpTunInterface( self, self.pg0, self.pg0.local_ip6, self.pg1.remote_hosts[2].ip6, flags=(e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN | e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_SET_DF | e.TUNNEL_API_ENCAP_DECAP_FLAG_DECAP_COPY_ECN)) tun_ecn.add_vpp_config() # IPv4 transport that sets a fixed DSCP in the encap and copies # the DF bit tun = VppIpIpTunInterface( self, self.pg0, self.pg0.local_ip6, self.pg1.remote_hosts[3].ip6, dscp=d.IP_API_DSCP_AF11, flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DF) tun.add_vpp_config() # array of all the tunnels tuns = [tun_dscp, tun_dscp_ecn, tun_ecn, tun] # addresses for prefixes routed via each tunnel a4s = ["" for i in range(len(tuns))] a6s = ["" for i in range(len(tuns))] # IP headers for inner packets with each combination of DSCp/ECN tested p_ip6s = [IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=dscp), IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=dscp_ecn), IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=ecn), IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=0xff)] p_ip4s = [IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp, flags='DF'), IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp_ecn), IP(src="1.2.3.4", dst="130.67.0.1", tos=ecn), IP(src="1.2.3.4", dst="130.67.0.1", tos=0xff)] # Configure each tunnel for i, t in enumerate(tuns): # Set interface up and enable IP on it self.vapi.sw_interface_set_flags(t.sw_if_index, 1) self.vapi.sw_interface_set_unnumbered( sw_if_index=self.pg0.sw_if_index, unnumbered_sw_if_index=t.sw_if_index) # prefix for route / destination address for packets a4s[i] = "130.67.%d.0" % i a6s[i] = "dead:%d::" % i # Add IPv4 and IPv6 routes via tunnel interface ip4_via_tunnel = VppIpRoute( self, a4s[i], 24, [VppRoutePath("0.0.0.0", t.sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP4)]) ip4_via_tunnel.add_vpp_config() ip6_via_tunnel = VppIpRoute( self, a6s[i], 64, [VppRoutePath("::", t.sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)]) ip6_via_tunnel.add_vpp_config() # # Encapsulation # # tun_dscp copies only the dscp # expected TC values are thus only the DCSP value is present from the # inner exp_tcs = [dscp, dscp, 0, 0xfc] p_ip6_encaps = [IPv6(src=self.pg0.local_ip6, dst=tun_dscp.dst, tc=tc) for tc in exp_tcs] # IPv4 in to IPv4 tunnel self.verify_ip4ip6_encaps(a4s[0], p_ip4s, p_ip6_encaps) # IPv6 in to IPv4 tunnel self.verify_ip6ip6_encaps(a6s[0], p_ip6s, p_ip6_encaps) # tun_dscp_ecn copies the dscp and the ecn exp_tcs = [dscp, dscp_ecn, ecn, 0xff] p_ip6_encaps = [IPv6(src=self.pg0.local_ip6, dst=tun_dscp_ecn.dst, tc=tc) for tc in exp_tcs] self.verify_ip4ip6_encaps(a4s[1], p_ip4s, p_ip6_encaps) self.verify_ip6ip6_encaps(a6s[1], p_ip6s, p_ip6_encaps) # tun_ecn copies only the ecn and always sets DF exp_tcs = [0, ecn, ecn, ecn] p_ip6_encaps = [IPv6(src=self.pg0.local_ip6, dst=tun_ecn.dst, tc=tc) for tc in exp_tcs] self.verify_ip4ip6_encaps(a4s[2], p_ip4s, p_ip6_encaps) self.verify_ip6ip6_encaps(a6s[2], p_ip6s, p_ip6_encaps) # tun sets a fixed dscp fixed_dscp = tun.dscp << 2 p_ip6_encaps = [IPv6(src=self.pg0.local_ip6, dst=tun.dst, tc=fixed_dscp) for i in range(len(p_ip4s))] self.verify_ip4ip6_encaps(a4s[3], p_ip4s, p_ip6_encaps) self.verify_ip6ip6_encaps(a6s[3], p_ip6s, p_ip6_encaps) # # Decapsulation # n_packets_decapped = self.statistics.get_err_counter( '/err/ipip6-input/packets decapsulated') self.p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) # IPv6 tunnel to IPv4 tcs = [0, dscp, dscp_ecn, ecn] # one overlay packet and all combinations of its encap p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4) p_ip6_encaps = [IPv6(src=tun.dst, dst=self.pg0.local_ip6, tc=tc) for tc in tcs] # for each encap tun will produce the same inner packet because it does # not copy up fields from the payload for p_ip6_encap in p_ip6_encaps: p6 = (self.p_ether / p_ip6_encap / p_ip4 / self.p_payload) p4_reply = (p_ip4 / self.p_payload) p4_reply.ttl -= 1 rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0) n_packets_decapped += N_PACKETS for p in rx: self.validate(p[1], p4_reply) self.assert_packet_checksums_valid(p) err = self.statistics.get_err_counter( '/err/ipip6-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) # tun_ecn copies the ECN bits from the encap to the inner p_ip6_encaps = [IPv6(src=tun_ecn.dst, dst=self.pg0.local_ip6, tc=tc) for tc in tcs] p_ip4_replys = [p_ip4.copy() for i in range(len(p_ip6_encaps))] p_ip4_replys[2].tos = ecn p_ip4_replys[3].tos = ecn for i, p_ip6_encap in enumerate(p_ip6_encaps): p6 = (self.p_ether / p_ip6_encap / p_ip4 / self.p_payload) p4_reply = (p_ip4_replys[i] / self.p_payload) p4_reply.ttl -= 1 rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0) n_packets_decapped += N_PACKETS for p in rx: self.validate(p[1], p4_reply) self.assert_packet_checksums_valid(p) err = self.statistics.get_err_counter( '/err/ipip6-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) # IPv6 tunnel to IPv6 # for each encap tun will produce the same inner packet because it does # not copy up fields from the payload p_ip6_encaps = [IPv6(src=tun.dst, dst=self.pg0.local_ip6, tc=tc) for tc in tcs] p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6) for p_ip6_encap in p_ip6_encaps: p6 = (self.p_ether / p_ip6_encap / p_ip6 / self.p_payload) p6_reply = (p_ip6 / self.p_payload) p6_reply.hlim = 63 rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0) n_packets_decapped += N_PACKETS for p in rx: self.validate(p[1], p6_reply) self.assert_packet_checksums_valid(p) err = self.statistics.get_err_counter( '/err/ipip6-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) # IPv6 tunnel to IPv6 # tun_ecn copies the ECN bits from the encap to the inner p_ip6_encaps = [IPv6(src=tun_ecn.dst, dst=self.pg0.local_ip6, tc=tc) for tc in tcs] p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6) p_ip6_replys = [p_ip6.copy() for i in range(len(p_ip6_encaps))] p_ip6_replys[2].tc = ecn p_ip6_replys[3].tc = ecn for i, p_ip6_encap in enumerate(p_ip6_encaps): p6 = (self.p_ether / p_ip6_encap / p_ip6 / self.p_payload) p6_reply = (p_ip6_replys[i] / self.p_payload) p6_reply.hlim = 63 rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0) n_packets_decapped += N_PACKETS for p in rx: self.validate(p[1], p6_reply) self.assert_packet_checksums_valid(p) err = self.statistics.get_err_counter( '/err/ipip6-input/packets decapsulated') self.assertEqual(err, n_packets_decapped) 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_err_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_err_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) / 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 = ipip_add_tunnel(self, '1.2.3.4', '2.3.4.5') 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 = ipip_add_tunnel(self, '1.2.3.4', '2.3.4.5', 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)