#!/usr/bin/env python from socket import inet_pton, inet_ntop, AF_INET, AF_INET6 import unittest from framework import VppTestCase, VppTestRunner from vpp_ip import DpoProto from vpp_ip_route import VppIpRoute, VppRoutePath, VppMplsLabel, VppIpTable 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_object import VppObject def find_abf_policy(test, id): policies = test.vapi.abf_policy_dump() for p in policies: if id == p.policy.policy_id: return True return False def find_abf_itf_attach(test, id, sw_if_index): attachs = test.vapi.abf_itf_attach_dump() for a in attachs: if id == a.attach.policy_id and \ sw_if_index == a.attach.sw_if_index: return True return False class VppAbfPolicy(VppObject): def __init__(self, test, policy_id, acl, paths): self._test = test self.policy_id = policy_id self.acl = acl self.paths = paths def encode_paths(self): br_paths = [] for p in self.paths: lstack = [] for l in p.nh_labels: if type(l) == VppMplsLabel: lstack.append(l.encode()) else: lstack.append({'label': l, 'ttl': 255}) n_labels = len(lstack) while (len(lstack) < 16): lstack.append({}) br_paths.append({'next_hop': p.nh_addr, 'weight': 1, 'afi': p.proto, 'sw_if_index': 0xffffffff, 'preference': 0, 'table_id': p.nh_table_id, 'next_hop_id': p.next_hop_id, 'is_udp_encap': p.is_udp_encap, 'n_labels': n_labels, 'label_stack': lstack}) return br_paths def add_vpp_config(self): self._test.vapi.abf_policy_add_del( 1, {'policy_id': self.policy_id, 'acl_index': self.acl.acl_index, 'n_paths': len(self.paths), 'paths': self.encode_paths()}) self._test.registry.register(self, self._test.logger) def remove_vpp_config(self): self._test.vapi.abf_policy_add_del( 0, {'policy_id': self.policy_id, 'acl_index': self.acl.acl_index, 'n_paths': len(self.paths), 'paths': self.encode_paths()}) def query_vpp_config(self): return find_abf_policy(self._test, self.policy_id) def __str__(self): return self.object_id() def object_id(self): return ("abf-policy-%d" % self.policy_id) class VppAbfAttach(VppObject): def __init__(self, test, policy_id, sw_if_index, priority, is_ipv6=0): self._test = test self.policy_id = policy_id self.sw_if_index = sw_if_index self.priority = priority self.is_ipv6 = is_ipv6 def add_vpp_config(self): self._test.vapi.abf_itf_attach_add_del( 1, {'policy_id': self.policy_id, 'sw_if_index': self.sw_if_index, 'priority': self.priority, 'is_ipv6': self.is_ipv6}) self._test.registry.register(self, self._test.logger) def remove_vpp_config(self): self._test.vapi.abf_itf_attach_add_del( 0, {'policy_id': self.policy_id, 'sw_if_index': self.sw_if_index, 'priority': self.priority, 'is_ipv6': self.is_ipv6}) def query_vpp_config(self): return find_abf_itf_attach(self._test, self.policy_id, self.sw_if_index) def __str__(self): return self.object_id() def object_id(self): return ("abf-attach-%d-%d" % (self.policy_id, self.sw_if_index)) class TestAbf(VppTestCase): """ ABF Test Case """ def setUp(self): super(TestAbf, self).setUp() self.create_pg_interfaces(range(5)) for i in self.pg_interfaces[:4]: 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.ip6_disable() i.admin_down() super(TestAbf, self).tearDown() def test_abf4(self): """ IPv4 ACL Based Forwarding """ # # We are not testing the various matching capabilities # of ACLs, that's done elsewhere. Here ware are testing # the application of ACLs to a forwarding path to achieve # ABF # So we construct just a few ACLs to ensure the ABF policies # are correctly constructed and used. And a few path types # to test the API path decoding. # # # Rule 1 # rule_1 = ({'is_permit': 1, 'is_ipv6': 0, 'proto': 17, 'srcport_or_icmptype_first': 1234, 'srcport_or_icmptype_last': 1234, 'src_ip_prefix_len': 32, 'src_ip_addr': inet_pton(AF_INET, "1.1.1.1"), 'dstport_or_icmpcode_first': 1234, 'dstport_or_icmpcode_last': 1234, 'dst_ip_prefix_len': 32, 'dst_ip_addr': inet_pton(AF_INET, "1.1.1.2")}) acl_1 = self.vapi.acl_add_replace(acl_index=4294967295, r=[rule_1]) # # ABF policy for ACL 1 - path via interface 1 # abf_1 = VppAbfPolicy(self, 10, acl_1, [VppRoutePath(self.pg1.remote_ip4, self.pg1.sw_if_index)]) abf_1.add_vpp_config() # # Attach the policy to input interface Pg0 # attach_1 = VppAbfAttach(self, 10, self.pg0.sw_if_index, 50) attach_1.add_vpp_config() # # fire in packet matching the ACL src,dst. If it's forwarded # then the ABF was successful, since default routing will drop it # p_1 = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) / IP(src="1.1.1.1", dst="1.1.1.2") / UDP(sport=1234, dport=1234) / Raw('\xa5' * 100)) self.send_and_expect(self.pg0, p_1*65, self.pg1) # # Attach a 'better' priority policy to the same interface # abf_2 = VppAbfPolicy(self, 11, acl_1, [VppRoutePath(self.pg2.remote_ip4, self.pg2.sw_if_index)]) abf_2.add_vpp_config() attach_2 = VppAbfAttach(self, 11, self.pg0.sw_if_index, 40) attach_2.add_vpp_config() self.send_and_expect(self.pg0, p_1*65, self.pg2) # # Attach a policy with priority in the middle # abf_3 = VppAbfPolicy(self, 12, acl_1, [VppRoutePath(self.pg3.remote_ip4, self.pg3.sw_if_index)]) abf_3.add_vpp_config() attach_3 = VppAbfAttach(self, 12, self.pg0.sw_if_index, 45) attach_3.add_vpp_config() self.send_and_expect(self.pg0, p_1*65, self.pg2) # # remove the best priority # attach_2.remove_vpp_config() self.send_and_expect(self.pg0, p_1*65, self.pg3) # # Attach one of the same policies to Pg1 # attach_4 = VppAbfAttach(self, 12, self.pg1.sw_if_index, 45) attach_4.add_vpp_config() p_2 = (Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac) / IP(src="1.1.1.1", dst="1.1.1.2") / UDP(sport=1234, dport=1234) / Raw('\xa5' * 100)) self.send_and_expect(self.pg1, p_2 * 65, self.pg3) # # detach the policy from PG1, now expect traffic to be dropped # attach_4.remove_vpp_config() self.send_and_assert_no_replies(self.pg1, p_2 * 65, "Detached") # # Swap to route via a next-hop in the non-default table # table_20 = VppIpTable(self, 20) table_20.add_vpp_config() self.pg4.set_table_ip4(table_20.table_id) self.pg4.admin_up() self.pg4.config_ip4() self.pg4.resolve_arp() abf_13 = VppAbfPolicy(self, 13, acl_1, [VppRoutePath(self.pg4.remote_ip4, 0xffffffff, nh_table_id=table_20.table_id)]) abf_13.add_vpp_config() attach_5 = VppAbfAttach(self, 13, self.pg0.sw_if_index, 30) attach_5.add_vpp_config() self.send_and_expect(self.pg0, p_1*65, self.pg4) self.pg4.unconfig_ip4() self.pg4.set_table_ip4(0) def test_abf6(self): """ IPv6 ACL Based Forwarding """ # # Simple test for matching IPv6 packets # # # Rule 1 # rule_1 = ({'is_permit': 1, 'is_ipv6': 1, 'proto': 17, 'srcport_or_icmptype_first': 1234, 'srcport_or_icmptype_last': 1234, 'src_ip_prefix_len': 128, 'src_ip_addr': inet_pton(AF_INET6, "2001::2"), 'dstport_or_icmpcode_first': 1234, 'dstport_or_icmpcode_last': 1234, 'dst_ip_prefix_len': 128, 'dst_ip_addr': inet_pton(AF_INET6, "2001::1")}) acl_1 = self.vapi.acl_add_replace(acl_index=4294967295, r=[rule_1]) # # ABF policy for ACL 1 - path via interface 1 # abf_1 = VppAbfPolicy(self, 10, acl_1, [VppRoutePath("3001::1", 0xffffffff, proto=DpoProto.DPO_PROTO_IP6)]) abf_1.add_vpp_config() attach_1 = VppAbfAttach(self, 10, self.pg0.sw_if_index, 45, is_ipv6=True) attach_1.add_vpp_config() # # a packet matching the rule # p = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) / IPv6(src="2001::2", dst="2001::1") / UDP(sport=1234, dport=1234) / Raw('\xa5' * 100)) # # packets are dropped because there is no route to the policy's # next hop # self.send_and_assert_no_replies(self.pg1, p * 65, "no route") # # add a route resolving the next-hop # route = VppIpRoute(self, "3001::1", 32, [VppRoutePath(self.pg1.remote_ip6, self.pg1.sw_if_index, proto=DpoProto.DPO_PROTO_IP6)], is_ip6=1) route.add_vpp_config() # # now expect packets forwarded. # self.send_and_expect(self.pg0, p * 65, self.pg1) if __name__ == '__main__': unittest.main(testRunner=VppTestRunner)