#!/usr/bin/env python
from framework import VppTestCase, VppTestRunner
from vpp_udp_encap import *
from vpp_ip import DpoProto
from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable
from scapy.packet import Raw
from scapy.layers.l2 import Ether, ARP
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6
from scapy.contrib.mpls import MPLS
from vpp_object import *
from socket import inet_pton, inet_ntop, AF_INET, AF_INET6
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(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.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 correclty 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")
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)
