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authorKlement Sekera <ksekera@cisco.com>2016-09-29 14:43:44 +0200
committerDave Barach <openvpp@barachs.net>2016-12-07 19:54:12 +0000
commit0e3c0de1ed87f3cdf16e26e05e39ea6eebeafb18 (patch)
treedd5f11c08311a95ce56eb8c33d4e8681940bf877 /test/bfd.py
parentd171d48edc1672564db8bb920586b8ea220df14c (diff)
BFD: basic asynchronous session up/down
This is a work-in-progress basic BFD session handling. Only asynchronous mode is supported at the moment. Setting the session flags doesn't work. Change-Id: Idba27f721b5c35be5a66a6d202a63d23ff7ecf6f Signed-off-by: Klement Sekera <ksekera@cisco.com>
Diffstat (limited to 'test/bfd.py')
-rw-r--r--test/bfd.py216
1 files changed, 216 insertions, 0 deletions
diff --git a/test/bfd.py b/test/bfd.py
new file mode 100644
index 00000000000..beacd80f687
--- /dev/null
+++ b/test/bfd.py
@@ -0,0 +1,216 @@
+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)