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#!/usr/bin/env python3
import unittest
import socket
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_papi import VppEnum
from vpp_ip_route import VppRoutePath
from framework import VppTestCase
class TestIpSessionRedirect(VppTestCase):
"""IP session redirect Test Case"""
@classmethod
def setUpClass(cls):
super(TestIpSessionRedirect, cls).setUpClass()
itfs = cls.create_pg_interfaces(range(3))
for itf in itfs:
itf.admin_up()
itf.config_ip4()
itf.resolve_arp()
itf.config_ip6()
itf.resolve_ndp()
def __build_mask(self, ip, src_port, match_n_vectors):
# UDP: udp src port (2 bytes)
udp = src_port.to_bytes(2, byteorder="big")
match = ip + udp
# skip the remainer
match += b"\x00" * (match_n_vectors * 16 - len(match))
return match
def build_mask4(self, proto, src_ip, src_port):
proto = proto.to_bytes(1, byteorder="big")
# IP: skip 9 bytes | proto (1 byte) | skip checksum (2 bytes) | src IP
# (4 bytes) | skip dst IP (4 bytes)
ip = b"\x00" * 9 + proto + b"\x00" * 2 + src_ip + b"\x00" * 4
return self.__build_mask(ip, src_port, 2)
def build_mask6(self, proto, src_ip, src_port):
nh = proto.to_bytes(1, byteorder="big")
# IPv6: skip 6 bytes | nh (1 byte) | skip hl (1 byte) | src IP (16
# bytes) | skip dst IP (16 bytes)
ip = b"\x00" * 6 + nh + b"\x00" + src_ip + b"\x00" * 16
return self.__build_mask(ip, src_port, 4)
def build_match(self, src_ip, src_port, is_ip6):
if is_ip6:
return self.build_mask6(
0x11, socket.inet_pton(socket.AF_INET6, src_ip), src_port
)
else:
return self.build_mask4(
0x11, socket.inet_pton(socket.AF_INET, src_ip), src_port
)
def create_table(self, is_ip6):
if is_ip6:
mask = self.build_mask6(0xFF, b"\xff" * 16, 0xFFFF)
match_n_vectors = 4
else:
mask = self.build_mask4(0xFF, b"\xff" * 4, 0xFFFF)
match_n_vectors = 2
r = self.vapi.classify_add_del_table(
is_add=True,
match_n_vectors=match_n_vectors,
miss_next_index=0, # drop
current_data_flag=1, # match on current header (ip)
mask_len=len(mask),
mask=mask,
)
return r.new_table_index
def __test_redirect(self, sport, dport, is_punt, is_ip6):
if is_ip6:
af = VppEnum.vl_api_address_family_t.ADDRESS_IP6
nh1 = self.pg1.remote_ip6
nh2 = self.pg2.remote_ip6
# note: nh3 is using a v4 adj to forward ipv6 packets
nh3 = self.pg2.remote_ip4
src = self.pg0.remote_ip6
dst = self.pg0.local_ip6
IP46 = IPv6
proto = VppEnum.vl_api_fib_path_nh_proto_t.FIB_API_PATH_NH_PROTO_IP6
else:
af = VppEnum.vl_api_address_family_t.ADDRESS_IP4
nh1 = self.pg1.remote_ip4
nh2 = self.pg2.remote_ip4
# note: nh3 is using a v6 adj to forward ipv4 packets
nh3 = self.pg2.remote_ip6
src = self.pg0.remote_ip4
dst = self.pg0.local_ip4
IP46 = IP
proto = VppEnum.vl_api_fib_path_nh_proto_t.FIB_API_PATH_NH_PROTO_IP4
if is_punt:
# punt udp packets to dport
self.vapi.set_punt(
is_add=1,
punt={
"type": VppEnum.vl_api_punt_type_t.PUNT_API_TYPE_L4,
"punt": {
"l4": {
"af": af,
"protocol": VppEnum.vl_api_ip_proto_t.IP_API_PROTO_UDP,
"port": dport,
}
},
},
)
pkts = [
(
Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
/ IP46(src=src, dst=dst)
/ UDP(sport=sport, dport=dport)
/ Raw("\x17" * 100)
)
] * 2
# create table and configure ACL
table_index = self.create_table(is_ip6)
ip4_tid, ip6_tid = (
(0xFFFFFFFF, table_index) if is_ip6 else (table_index, 0xFFFFFFFF)
)
if is_punt:
self.vapi.punt_acl_add_del(
is_add=1, ip4_table_index=ip4_tid, ip6_table_index=ip6_tid
)
else:
self.vapi.input_acl_set_interface(
is_add=1,
ip4_table_index=ip4_tid,
ip6_table_index=ip6_tid,
l2_table_index=0xFFFFFFFF,
sw_if_index=self.pg0.sw_if_index,
)
# add a session redirect rule but not matching the stream: expect to
# drop
paths = [VppRoutePath(nh1, 0xFFFFFFFF).encode()]
match1 = self.build_match(src, sport + 10, is_ip6)
r = self.vapi.ip_session_redirect_add_v2(
table_index=table_index,
match_len=len(match1),
match=match1,
is_punt=is_punt,
n_paths=1,
paths=paths,
)
self.send_and_assert_no_replies(self.pg0, pkts)
# redirect a session matching the stream: expect to pass
match2 = self.build_match(src, sport, is_ip6)
self.vapi.ip_session_redirect_add_v2(
table_index=table_index,
match_len=len(match2),
match=match2,
is_punt=is_punt,
n_paths=1,
paths=paths,
)
self.send_and_expect_only(self.pg0, pkts, self.pg1)
# update the matching entry so it redirects to pg2
# nh3 is using a v4 adj for v6 and vice-versa, hence we must specify
# the payload proto with v2 api
paths = [VppRoutePath(nh3, 0xFFFFFFFF).encode()]
self.vapi.ip_session_redirect_add_v2(
table_index=table_index,
match_len=len(match2),
match=match2,
is_punt=is_punt,
n_paths=1,
paths=paths,
proto=proto,
)
self.send_and_expect_only(self.pg0, pkts, self.pg2)
# we still have only 2 sessions, not 3
t = self.vapi.classify_table_info(table_id=table_index)
self.assertEqual(t.active_sessions, 2)
# cleanup
self.vapi.ip_session_redirect_del(table_index, len(match2), match2)
self.vapi.ip_session_redirect_del(table_index, len(match1), match1)
t = self.vapi.classify_table_info(table_id=table_index)
self.assertEqual(t.active_sessions, 0)
if is_punt:
self.vapi.punt_acl_add_del(
is_add=0, ip4_table_index=ip4_tid, ip6_table_index=ip6_tid
)
else:
self.vapi.input_acl_set_interface(
is_add=0,
ip4_table_index=ip4_tid,
ip6_table_index=ip6_tid,
l2_table_index=0xFFFFFFFF,
sw_if_index=self.pg0.sw_if_index,
)
def test_punt_redirect_ipv4(self):
"""IPv4 punt session redirect test"""
return self.__test_redirect(sport=6754, dport=17923, is_punt=True, is_ip6=False)
def test_punt_redirect_ipv6(self):
"""IPv6 punt session redirect test"""
return self.__test_redirect(sport=28447, dport=4035, is_punt=True, is_ip6=True)
def test_redirect_ipv4(self):
"""IPv4 session redirect test"""
return self.__test_redirect(sport=834, dport=1267, is_punt=False, is_ip6=False)
def test_redirect_ipv6(self):
"""IPv6 session redirect test"""
return self.__test_redirect(sport=9999, dport=32768, is_punt=False, is_ip6=True)
if __name__ == "__main__":
unittest.main(testRunner=VppTestRunner)
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