test/test_abf.py

   1 #!/usr/bin/env python
   2
   3 from socket import inet_pton, inet_ntop, AF_INET, AF_INET6
   4 import unittest
   5
   6 from framework import VppTestCase, VppTestRunner
   7 from vpp_ip import DpoProto
   8 from vpp_ip_route import VppIpRoute, VppRoutePath, VppMplsLabel, VppIpTable
   9
  10 from scapy.packet import Raw
  11 from scapy.layers.l2 import Ether
  12 from scapy.layers.inet import IP, UDP
  13 from scapy.layers.inet6 import IPv6
  14
  15 from vpp_object import VppObject
  16
  17
  18 def find_abf_policy(test, id):
  19     policies = test.vapi.abf_policy_dump()
  20     for p in policies:
  21         if id == p.policy.policy_id:
  22             return True
  23     return False
  24
  25
  26 def find_abf_itf_attach(test, id, sw_if_index):
  27     attachs = test.vapi.abf_itf_attach_dump()
  28     for a in attachs:
  29         if id == a.attach.policy_id and \
  30            sw_if_index == a.attach.sw_if_index:
  31             return True
  32     return False
  33
  34
  35 class VppAbfPolicy(VppObject):
  36
  37     def __init__(self,
  38                  test,
  39                  policy_id,
  40                  acl,
  41                  paths):
  42         self._test = test
  43         self.policy_id = policy_id
  44         self.acl = acl
  45         self.paths = paths
  46
  47     def encode_paths(self):
  48         br_paths = []
  49         for p in self.paths:
  50             lstack = []
  51             for l in p.nh_labels:
  52                 if type(l) == VppMplsLabel:
  53                     lstack.append(l.encode())
  54                 else:
  55                     lstack.append({'label': l, 'ttl': 255})
  56             n_labels = len(lstack)
  57             while (len(lstack) < 16):
  58                 lstack.append({})
  59             br_paths.append({'next_hop': p.nh_addr,
  60                              'weight': 1,
  61                              'afi': p.proto,
  62                              'sw_if_index': 0xffffffff,
  63                              'preference': 0,
  64                              'table_id': p.nh_table_id,
  65                              'next_hop_id': p.next_hop_id,
  66                              'is_udp_encap': p.is_udp_encap,
  67                              'n_labels': n_labels,
  68                              'label_stack': lstack})
  69         return br_paths
  70
  71     def add_vpp_config(self):
  72         self._test.vapi.abf_policy_add_del(
  73             1,
  74             {'policy_id': self.policy_id,
  75              'acl_index': self.acl.acl_index,
  76              'n_paths': len(self.paths),
  77              'paths': self.encode_paths()})
  78         self._test.registry.register(self, self._test.logger)
  79
  80     def remove_vpp_config(self):
  81         self._test.vapi.abf_policy_add_del(
  82             0,
  83             {'policy_id': self.policy_id,
  84              'acl_index': self.acl.acl_index,
  85              'n_paths': len(self.paths),
  86              'paths': self.encode_paths()})
  87
  88     def query_vpp_config(self):
  89         return find_abf_policy(self._test, self.policy_id)
  90
  91     def __str__(self):
  92         return self.object_id()
  93
  94     def object_id(self):
  95         return ("abf-policy-%d" % self.policy_id)
  96
  97
  98 class VppAbfAttach(VppObject):
  99
 100     def __init__(self,
 101                  test,
 102                  policy_id,
 103                  sw_if_index,
 104                  priority,
 105                  is_ipv6=0):
 106         self._test = test
 107         self.policy_id = policy_id
 108         self.sw_if_index = sw_if_index
 109         self.priority = priority
 110         self.is_ipv6 = is_ipv6
 111
 112     def add_vpp_config(self):
 113         self._test.vapi.abf_itf_attach_add_del(
 114             1,
 115             {'policy_id': self.policy_id,
 116              'sw_if_index': self.sw_if_index,
 117              'priority': self.priority,
 118              'is_ipv6': self.is_ipv6})
 119         self._test.registry.register(self, self._test.logger)
 120
 121     def remove_vpp_config(self):
 122         self._test.vapi.abf_itf_attach_add_del(
 123             0,
 124             {'policy_id': self.policy_id,
 125              'sw_if_index': self.sw_if_index,
 126              'priority': self.priority,
 127              'is_ipv6': self.is_ipv6})
 128
 129     def query_vpp_config(self):
 130         return find_abf_itf_attach(self._test,
 131                                    self.policy_id,
 132                                    self.sw_if_index)
 133
 134     def __str__(self):
 135         return self.object_id()
 136
 137     def object_id(self):
 138         return ("abf-attach-%d-%d" % (self.policy_id, self.sw_if_index))
 139
 140
 141 class TestAbf(VppTestCase):
 142     """ ABF Test Case """
 143
 144     def setUp(self):
 145         super(TestAbf, self).setUp()
 146
 147         self.create_pg_interfaces(range(5))
 148
 149         for i in self.pg_interfaces[:4]:
 150             i.admin_up()
 151             i.config_ip4()
 152             i.resolve_arp()
 153             i.config_ip6()
 154             i.resolve_ndp()
 155
 156     def tearDown(self):
 157         for i in self.pg_interfaces:
 158             i.unconfig_ip4()
 159             i.unconfig_ip6()
 160             i.ip6_disable()
 161             i.admin_down()
 162         super(TestAbf, self).tearDown()
 163
 164     def test_abf4(self):
 165         """ IPv4 ACL Based Forwarding
 166         """
 167
 168         #
 169         # We are not testing the various matching capabilities
 170         # of ACLs, that's done elsewhere. Here ware are testing
 171         # the application of ACLs to a forwarding path to achieve
 172         # ABF
 173         # So we construct just a few ACLs to ensure the ABF policies
 174         # are correctly constructed and used. And a few path types
 175         # to test the API path decoding.
 176         #
 177
 178         #
 179         # Rule 1
 180         #
 181         rule_1 = ({'is_permit': 1,
 182                    'is_ipv6': 0,
 183                    'proto': 17,
 184                    'srcport_or_icmptype_first': 1234,
 185                    'srcport_or_icmptype_last': 1234,
 186                    'src_ip_prefix_len': 32,
 187                    'src_ip_addr': inet_pton(AF_INET, "1.1.1.1"),
 188                    'dstport_or_icmpcode_first': 1234,
 189                    'dstport_or_icmpcode_last': 1234,
 190                    'dst_ip_prefix_len': 32,
 191                    'dst_ip_addr': inet_pton(AF_INET, "1.1.1.2")})
 192         acl_1 = self.vapi.acl_add_replace(acl_index=4294967295, r=[rule_1])
 193
 194         #
 195         # ABF policy for ACL 1 - path via interface 1
 196         #
 197         abf_1 = VppAbfPolicy(self, 10, acl_1,
 198                              [VppRoutePath(self.pg1.remote_ip4,
 199                                            self.pg1.sw_if_index)])
 200         abf_1.add_vpp_config()
 201
 202         #
 203         # Attach the policy to input interface Pg0
 204         #
 205         attach_1 = VppAbfAttach(self, 10, self.pg0.sw_if_index, 50)
 206         attach_1.add_vpp_config()
 207
 208         #
 209         # fire in packet matching the ACL src,dst. If it's forwarded
 210         # then the ABF was successful, since default routing will drop it
 211         #
 212         p_1 = (Ether(src=self.pg0.remote_mac,
 213                      dst=self.pg0.local_mac) /
 214                IP(src="1.1.1.1", dst="1.1.1.2") /
 215                UDP(sport=1234, dport=1234) /
 216                Raw('\xa5' * 100))
 217         self.send_and_expect(self.pg0, p_1*65, self.pg1)
 218
 219         #
 220         # Attach a 'better' priority policy to the same interface
 221         #
 222         abf_2 = VppAbfPolicy(self, 11, acl_1,
 223                              [VppRoutePath(self.pg2.remote_ip4,
 224                                            self.pg2.sw_if_index)])
 225         abf_2.add_vpp_config()
 226         attach_2 = VppAbfAttach(self, 11, self.pg0.sw_if_index, 40)
 227         attach_2.add_vpp_config()
 228
 229         self.send_and_expect(self.pg0, p_1*65, self.pg2)
 230
 231         #
 232         # Attach a policy with priority in the middle
 233         #
 234         abf_3 = VppAbfPolicy(self, 12, acl_1,
 235                              [VppRoutePath(self.pg3.remote_ip4,
 236                                            self.pg3.sw_if_index)])
 237         abf_3.add_vpp_config()
 238         attach_3 = VppAbfAttach(self, 12, self.pg0.sw_if_index, 45)
 239         attach_3.add_vpp_config()
 240
 241         self.send_and_expect(self.pg0, p_1*65, self.pg2)
 242
 243         #
 244         # remove the best priority
 245         #
 246         attach_2.remove_vpp_config()
 247         self.send_and_expect(self.pg0, p_1*65, self.pg3)
 248
 249         #
 250         # Attach one of the same policies to Pg1
 251         #
 252         attach_4 = VppAbfAttach(self, 12, self.pg1.sw_if_index, 45)
 253         attach_4.add_vpp_config()
 254
 255         p_2 = (Ether(src=self.pg1.remote_mac,
 256                      dst=self.pg1.local_mac) /
 257                IP(src="1.1.1.1", dst="1.1.1.2") /
 258                UDP(sport=1234, dport=1234) /
 259                Raw('\xa5' * 100))
 260         self.send_and_expect(self.pg1, p_2 * 65, self.pg3)
 261
 262         #
 263         # detach the policy from PG1, now expect traffic to be dropped
 264         #
 265         attach_4.remove_vpp_config()
 266
 267         self.send_and_assert_no_replies(self.pg1, p_2 * 65, "Detached")
 268
 269         #
 270         # Swap to route via a next-hop in the non-default table
 271         #
 272         table_20 = VppIpTable(self, 20)
 273         table_20.add_vpp_config()
 274
 275         self.pg4.set_table_ip4(table_20.table_id)
 276         self.pg4.admin_up()
 277         self.pg4.config_ip4()
 278         self.pg4.resolve_arp()
 279
 280         abf_13 = VppAbfPolicy(self, 13, acl_1,
 281                               [VppRoutePath(self.pg4.remote_ip4,
 282                                             0xffffffff,
 283                                             nh_table_id=table_20.table_id)])
 284         abf_13.add_vpp_config()
 285         attach_5 = VppAbfAttach(self, 13, self.pg0.sw_if_index, 30)
 286         attach_5.add_vpp_config()
 287
 288         self.send_and_expect(self.pg0, p_1*65, self.pg4)
 289
 290         self.pg4.unconfig_ip4()
 291         self.pg4.set_table_ip4(0)
 292
 293     def test_abf6(self):
 294         """ IPv6 ACL Based Forwarding
 295         """
 296
 297         #
 298         # Simple test for matching IPv6 packets
 299         #
 300
 301         #
 302         # Rule 1
 303         #
 304         rule_1 = ({'is_permit': 1,
 305                    'is_ipv6': 1,
 306                    'proto': 17,
 307                    'srcport_or_icmptype_first': 1234,
 308                    'srcport_or_icmptype_last': 1234,
 309                    'src_ip_prefix_len': 128,
 310                    'src_ip_addr': inet_pton(AF_INET6, "2001::2"),
 311                    'dstport_or_icmpcode_first': 1234,
 312                    'dstport_or_icmpcode_last': 1234,
 313                    'dst_ip_prefix_len': 128,
 314                    'dst_ip_addr': inet_pton(AF_INET6, "2001::1")})
 315         acl_1 = self.vapi.acl_add_replace(acl_index=4294967295,
 316                                           r=[rule_1])
 317
 318         #
 319         # ABF policy for ACL 1 - path via interface 1
 320         #
 321         abf_1 = VppAbfPolicy(self, 10, acl_1,
 322                              [VppRoutePath("3001::1",
 323                                            0xffffffff,
 324                                            proto=DpoProto.DPO_PROTO_IP6)])
 325         abf_1.add_vpp_config()
 326
 327         attach_1 = VppAbfAttach(self, 10, self.pg0.sw_if_index,
 328                                 45, is_ipv6=True)
 329         attach_1.add_vpp_config()
 330
 331         #
 332         # a packet matching the rule
 333         #
 334         p = (Ether(src=self.pg0.remote_mac,
 335                    dst=self.pg0.local_mac) /
 336              IPv6(src="2001::2", dst="2001::1") /
 337              UDP(sport=1234, dport=1234) /
 338              Raw('\xa5' * 100))
 339
 340         #
 341         # packets are dropped because there is no route to the policy's
 342         # next hop
 343         #
 344         self.send_and_assert_no_replies(self.pg1, p * 65, "no route")
 345
 346         #
 347         # add a route resolving the next-hop
 348         #
 349         route = VppIpRoute(self, "3001::1", 32,
 350                            [VppRoutePath(self.pg1.remote_ip6,
 351                                          self.pg1.sw_if_index,
 352                                          proto=DpoProto.DPO_PROTO_IP6)],
 353                            is_ip6=1)
 354         route.add_vpp_config()
 355
 356         #
 357         # now expect packets forwarded.
 358         #
 359         self.send_and_expect(self.pg0, p * 65, self.pg1)
 360
 361
 362 if __name__ == '__main__':
 363     unittest.main(testRunner=VppTestRunner)