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from socket import AF_INET, AF_INET6
from scapy.all import *
from scapy.packet import *
from scapy.fields import *
from framework import *
from vpp_object import *
from util import NumericConstant
class BFDDiagCode(NumericConstant):
""" BFD Diagnostic Code """
no_diagnostic = 0
control_detection_time_expired = 1
echo_function_failed = 2
neighbor_signaled_session_down = 3
forwarding_plane_reset = 4
path_down = 5
concatenated_path_down = 6
administratively_down = 7
reverse_concatenated_path_down = 8
desc_dict = {
no_diagnostic: "No diagnostic",
control_detection_time_expired: "Control Detection Time Expired",
echo_function_failed: "Echo Function Failed",
neighbor_signaled_session_down: "Neighbor Signaled Session Down",
forwarding_plane_reset: "Forwarding Plane Reset",
path_down: "Path Down",
concatenated_path_down: "Concatenated Path Down",
administratively_down: "Administratively Down",
reverse_concatenated_path_down: "Reverse Concatenated Path Down",
}
def __init__(self, value):
NumericConstant.__init__(self, value)
class BFDState(NumericConstant):
""" BFD State """
admin_down = 0
down = 1
init = 2
up = 3
desc_dict = {
admin_down: "AdminDown",
down: "Down",
init: "Init",
up: "Up",
}
def __init__(self, value):
NumericConstant.__init__(self, value)
class BFD(Packet):
udp_dport = 3784 #: BFD destination port per RFC 5881
udp_sport_min = 49152 #: BFD source port min value per RFC 5881
udp_sport_max = 65535 #: BFD source port max value per RFC 5881
name = "BFD"
fields_desc = [
BitField("version", 1, 3),
BitEnumField("diag", 0, 5, BFDDiagCode.desc_dict),
BitEnumField("state", 0, 2, BFDState.desc_dict),
FlagsField("flags", 0, 6, ['P', 'F', 'C', 'A', 'D', 'M']),
XByteField("detect_mult", 0),
XByteField("length", 24),
BitField("my_discriminator", 0, 32),
BitField("your_discriminator", 0, 32),
BitField("desired_min_tx_interval", 0, 32),
BitField("required_min_rx_interval", 0, 32),
BitField("required_min_echo_rx_interval", 0, 32)]
def mysummary(self):
return self.sprintf("BFD(my_disc=%BFD.my_discriminator%,"
"your_disc=%BFD.your_discriminator%)")
# glue the BFD packet class to scapy parser
bind_layers(UDP, BFD, dport=BFD.udp_dport)
class VppBFDUDPSession(VppObject):
""" Represents BFD UDP session in VPP """
@property
def test(self):
""" Test which created this session """
return self._test
@property
def interface(self):
""" Interface on which this session lives """
return self._interface
@property
def af(self):
""" Address family - AF_INET or AF_INET6 """
return self._af
@property
def bs_index(self):
""" BFD session index from VPP """
if self._bs_index is not None:
return self._bs_index
raise NotConfiguredException("not configured")
@property
def local_addr(self):
""" BFD session local address (VPP address) """
if self._local_addr is None:
return self._interface.local_ip4
return self._local_addr
@property
def local_addr_n(self):
""" BFD session local address (VPP address) - raw, suitable for API """
if self._local_addr is None:
return self._interface.local_ip4n
return self._local_addr_n
@property
def peer_addr(self):
""" BFD session peer address """
return self._peer_addr
@property
def peer_addr_n(self):
""" BFD session peer address - raw, suitable for API """
return self._peer_addr_n
@property
def state(self):
""" BFD session state """
result = self.test.vapi.bfd_udp_session_dump()
session = None
for s in result:
if s.sw_if_index == self.interface.sw_if_index:
if self.af == AF_INET \
and s.is_ipv6 == 0 \
and self.interface.local_ip4n == s.local_addr[:4] \
and self.interface.remote_ip4n == s.peer_addr[:4]:
session = s
break
if session is None:
raise Exception(
"Could not find BFD session in VPP response: %s" % repr(result))
return session.state
@property
def desired_min_tx(self):
return self._desired_min_tx
@property
def required_min_rx(self):
return self._required_min_rx
@property
def detect_mult(self):
return self._detect_mult
def __init__(self, test, interface, peer_addr, local_addr=None, af=AF_INET):
self._test = test
self._interface = interface
self._af = af
self._local_addr = local_addr
self._peer_addr = peer_addr
self._peer_addr_n = socket.inet_pton(af, peer_addr)
self._bs_index = None
self._desired_min_tx = 200000 # 0.2s
self._required_min_rx = 200000 # 0.2s
self._detect_mult = 3 # 3 packets need to be missed
def add_vpp_config(self):
is_ipv6 = 1 if AF_INET6 == self.af else 0
result = self.test.vapi.bfd_udp_add(
self._interface.sw_if_index,
self.desired_min_tx,
self.required_min_rx,
self.detect_mult,
self.local_addr_n,
self.peer_addr_n,
is_ipv6=is_ipv6)
self._bs_index = result.bs_index
def query_vpp_config(self):
result = self.test.vapi.bfd_udp_session_dump()
session = None
for s in result:
if s.sw_if_index == self.interface.sw_if_index:
if self.af == AF_INET \
and s.is_ipv6 == 0 \
and self.interface.local_ip4n == s.local_addr[:4] \
and self.interface.remote_ip4n == s.peer_addr[:4]:
session = s
break
if session is None:
return False
return True
def remove_vpp_config(self):
if hasattr(self, '_bs_index'):
is_ipv6 = 1 if AF_INET6 == self._af else 0
self.test.vapi.bfd_udp_del(
self._interface.sw_if_index,
self.local_addr_n,
self.peer_addr_n,
is_ipv6=is_ipv6)
def object_id(self):
return "bfd-udp-%d" % self.bs_index
def admin_up(self):
self.test.vapi.bfd_session_set_flags(self.bs_index, 1)
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