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 object_id(self):
  92         return ("abf-policy-%d" % self.policy_id)
  93
  94
  95 class VppAbfAttach(VppObject):
  96
  97     def __init__(self,
  98                  test,
  99                  policy_id,
 100                  sw_if_index,
 101                  priority,
 102                  is_ipv6=0):
 103         self._test = test
 104         self.policy_id = policy_id
 105         self.sw_if_index = sw_if_index
 106         self.priority = priority
 107         self.is_ipv6 = is_ipv6
 108
 109     def add_vpp_config(self):
 110         self._test.vapi.abf_itf_attach_add_del(
 111             1,
 112             {'policy_id': self.policy_id,
 113              'sw_if_index': self.sw_if_index,
 114              'priority': self.priority,
 115              'is_ipv6': self.is_ipv6})
 116         self._test.registry.register(self, self._test.logger)
 117
 118     def remove_vpp_config(self):
 119         self._test.vapi.abf_itf_attach_add_del(
 120             0,
 121             {'policy_id': self.policy_id,
 122              'sw_if_index': self.sw_if_index,
 123              'priority': self.priority,
 124              'is_ipv6': self.is_ipv6})
 125
 126     def query_vpp_config(self):
 127         return find_abf_itf_attach(self._test,
 128                                    self.policy_id,
 129                                    self.sw_if_index)
 130
 131     def object_id(self):
 132         return ("abf-attach-%d-%d" % (self.policy_id, self.sw_if_index))
 133
 134
 135 class TestAbf(VppTestCase):
 136     """ ABF Test Case """
 137
 138     def setUp(self):
 139         super(TestAbf, self).setUp()
 140
 141         self.create_pg_interfaces(range(5))
 142
 143         for i in self.pg_interfaces[:4]:
 144             i.admin_up()
 145             i.config_ip4()
 146             i.resolve_arp()
 147             i.config_ip6()
 148             i.resolve_ndp()
 149
 150     def tearDown(self):
 151         for i in self.pg_interfaces:
 152             i.unconfig_ip4()
 153             i.unconfig_ip6()
 154             i.ip6_disable()
 155             i.admin_down()
 156         super(TestAbf, self).tearDown()
 157
 158     def test_abf4(self):
 159         """ IPv4 ACL Based Forwarding
 160         """
 161
 162         #
 163         # We are not testing the various matching capabilities
 164         # of ACLs, that's done elsewhere. Here ware are testing
 165         # the application of ACLs to a forwarding path to achieve
 166         # ABF
 167         # So we construct just a few ACLs to ensure the ABF policies
 168         # are correctly constructed and used. And a few path types
 169         # to test the API path decoding.
 170         #
 171
 172         #
 173         # Rule 1
 174         #
 175         rule_1 = ({'is_permit': 1,
 176                    'is_ipv6': 0,
 177                    'proto': 17,
 178                    'srcport_or_icmptype_first': 1234,
 179                    'srcport_or_icmptype_last': 1234,
 180                    'src_ip_prefix_len': 32,
 181                    'src_ip_addr': inet_pton(AF_INET, "1.1.1.1"),
 182                    'dstport_or_icmpcode_first': 1234,
 183                    'dstport_or_icmpcode_last': 1234,
 184                    'dst_ip_prefix_len': 32,
 185                    'dst_ip_addr': inet_pton(AF_INET, "1.1.1.2")})
 186         acl_1 = self.vapi.acl_add_replace(acl_index=4294967295, r=[rule_1])
 187
 188         #
 189         # ABF policy for ACL 1 - path via interface 1
 190         #
 191         abf_1 = VppAbfPolicy(self, 10, acl_1,
 192                              [VppRoutePath(self.pg1.remote_ip4,
 193                                            self.pg1.sw_if_index)])
 194         abf_1.add_vpp_config()
 195
 196         #
 197         # Attach the policy to input interface Pg0
 198         #
 199         attach_1 = VppAbfAttach(self, 10, self.pg0.sw_if_index, 50)
 200         attach_1.add_vpp_config()
 201
 202         #
 203         # fire in packet matching the ACL src,dst. If it's forwarded
 204         # then the ABF was successful, since default routing will drop it
 205         #
 206         p_1 = (Ether(src=self.pg0.remote_mac,
 207                      dst=self.pg0.local_mac) /
 208                IP(src="1.1.1.1", dst="1.1.1.2") /
 209                UDP(sport=1234, dport=1234) /
 210                Raw('\xa5' * 100))
 211         self.send_and_expect(self.pg0, p_1*65, self.pg1)
 212
 213         #
 214         # Attach a 'better' priority policy to the same interface
 215         #
 216         abf_2 = VppAbfPolicy(self, 11, acl_1,
 217                              [VppRoutePath(self.pg2.remote_ip4,
 218                                            self.pg2.sw_if_index)])
 219         abf_2.add_vpp_config()
 220         attach_2 = VppAbfAttach(self, 11, self.pg0.sw_if_index, 40)
 221         attach_2.add_vpp_config()
 222
 223         self.send_and_expect(self.pg0, p_1*65, self.pg2)
 224
 225         #
 226         # Attach a policy with priority in the middle
 227         #
 228         abf_3 = VppAbfPolicy(self, 12, acl_1,
 229                              [VppRoutePath(self.pg3.remote_ip4,
 230                                            self.pg3.sw_if_index)])
 231         abf_3.add_vpp_config()
 232         attach_3 = VppAbfAttach(self, 12, self.pg0.sw_if_index, 45)
 233         attach_3.add_vpp_config()
 234
 235         self.send_and_expect(self.pg0, p_1*65, self.pg2)
 236
 237         #
 238         # remove the best priority
 239         #
 240         attach_2.remove_vpp_config()
 241         self.send_and_expect(self.pg0, p_1*65, self.pg3)
 242
 243         #
 244         # Attach one of the same policies to Pg1
 245         #
 246         attach_4 = VppAbfAttach(self, 12, self.pg1.sw_if_index, 45)
 247         attach_4.add_vpp_config()
 248
 249         p_2 = (Ether(src=self.pg1.remote_mac,
 250                      dst=self.pg1.local_mac) /
 251                IP(src="1.1.1.1", dst="1.1.1.2") /
 252                UDP(sport=1234, dport=1234) /
 253                Raw('\xa5' * 100))
 254         self.send_and_expect(self.pg1, p_2 * 65, self.pg3)
 255
 256         #
 257         # detach the policy from PG1, now expect traffic to be dropped
 258         #
 259         attach_4.remove_vpp_config()
 260
 261         self.send_and_assert_no_replies(self.pg1, p_2 * 65, "Detached")
 262
 263         #
 264         # Swap to route via a next-hop in the non-default table
 265         #
 266         table_20 = VppIpTable(self, 20)
 267         table_20.add_vpp_config()
 268
 269         self.pg4.set_table_ip4(table_20.table_id)
 270         self.pg4.admin_up()
 271         self.pg4.config_ip4()
 272         self.pg4.resolve_arp()
 273
 274         abf_13 = VppAbfPolicy(self, 13, acl_1,
 275                               [VppRoutePath(self.pg4.remote_ip4,
 276                                             0xffffffff,
 277                                             nh_table_id=table_20.table_id)])
 278         abf_13.add_vpp_config()
 279         attach_5 = VppAbfAttach(self, 13, self.pg0.sw_if_index, 30)
 280         attach_5.add_vpp_config()
 281
 282         self.send_and_expect(self.pg0, p_1*65, self.pg4)
 283
 284         self.pg4.unconfig_ip4()
 285         self.pg4.set_table_ip4(0)
 286
 287     def test_abf6(self):
 288         """ IPv6 ACL Based Forwarding
 289         """
 290
 291         #
 292         # Simple test for matching IPv6 packets
 293         #
 294
 295         #
 296         # Rule 1
 297         #
 298         rule_1 = ({'is_permit': 1,
 299                    'is_ipv6': 1,
 300                    'proto': 17,
 301                    'srcport_or_icmptype_first': 1234,
 302                    'srcport_or_icmptype_last': 1234,
 303                    'src_ip_prefix_len': 128,
 304                    'src_ip_addr': inet_pton(AF_INET6, "2001::2"),
 305                    'dstport_or_icmpcode_first': 1234,
 306                    'dstport_or_icmpcode_last': 1234,
 307                    'dst_ip_prefix_len': 128,
 308                    'dst_ip_addr': inet_pton(AF_INET6, "2001::1")})
 309         acl_1 = self.vapi.acl_add_replace(acl_index=4294967295,
 310                                           r=[rule_1])
 311
 312         #
 313         # ABF policy for ACL 1 - path via interface 1
 314         #
 315         abf_1 = VppAbfPolicy(self, 10, acl_1,
 316                              [VppRoutePath("3001::1",
 317                                            0xffffffff,
 318                                            proto=DpoProto.DPO_PROTO_IP6)])
 319         abf_1.add_vpp_config()
 320
 321         attach_1 = VppAbfAttach(self, 10, self.pg0.sw_if_index,
 322                                 45, is_ipv6=True)
 323         attach_1.add_vpp_config()
 324
 325         #
 326         # a packet matching the rule
 327         #
 328         p = (Ether(src=self.pg0.remote_mac,
 329                    dst=self.pg0.local_mac) /
 330              IPv6(src="2001::2", dst="2001::1") /
 331              UDP(sport=1234, dport=1234) /
 332              Raw('\xa5' * 100))
 333
 334         #
 335         # packets are dropped because there is no route to the policy's
 336         # next hop
 337         #
 338         self.send_and_assert_no_replies(self.pg1, p * 65, "no route")
 339
 340         #
 341         # add a route resolving the next-hop
 342         #
 343         route = VppIpRoute(self, "3001::1", 32,
 344                            [VppRoutePath(self.pg1.remote_ip6,
 345                                          self.pg1.sw_if_index,
 346                                          proto=DpoProto.DPO_PROTO_IP6)],
 347                            is_ip6=1)
 348         route.add_vpp_config()
 349
 350         #
 351         # now expect packets forwarded.
 352         #
 353         self.send_and_expect(self.pg0, p * 65, self.pg1)
 354
 355
 356 if __name__ == '__main__':
 357     unittest.main(testRunner=VppTestRunner)