from scapy.layers.inet import UDP
from scapy.packet import Packet
from scapy.fields import BitField, BitEnumField, XByteField, FlagsField,\
- ConditionalField, StrField
+ ConditionalField, StrField
from vpp_object import VppObject
from util import NumericConstant
""" BFD protocol layer for scapy """
udp_dport = 3784 #: BFD destination port per RFC 5881
+ udp_dport_echo = 3785 # : BFD destination port for ECHO 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
bfd_pkt_len = 24 # : length of BFD pkt without authentication section
bind_layers(UDP, BFD, dport=BFD.udp_dport)
+class BFD_vpp_echo(Packet):
+ """ BFD echo packet as used by VPP (non-rfc, as rfc doesn't define one) """
+
+ udp_dport = 3785 #: BFD echo destination port per RFC 5881
+ name = "BFD_VPP_ECHO"
+
+ fields_desc = [
+ BitField("discriminator", 0, 32),
+ BitField("expire_time_clocks", 0, 64),
+ BitField("checksum", 0, 64)
+ ]
+
+ def mysummary(self):
+ return self.sprintf(
+ "BFD_VPP_ECHO(disc=%BFD_VPP_ECHO.discriminator%,"
+ "expire_time_clocks=%BFD_VPP_ECHO.expire_time_clocks%)")
+
+# glue the BFD echo packet class to scapy parser
+bind_layers(UDP, BFD_vpp_echo, dport=BFD_vpp_echo.udp_dport)
+
+
class VppBFDAuthKey(VppObject):
""" Represents BFD authentication key in VPP """
""" key data """
return self._key
+ @key.setter
+ def key(self, value):
+ self._key = value
+
@property
def conf_key_id(self):
""" configuration key ID """
""" Represents BFD UDP session in VPP """
def __init__(self, test, interface, peer_addr, local_addr=None, af=AF_INET,
- desired_min_tx=100000, required_min_rx=100000, detect_mult=3,
+ desired_min_tx=300000, required_min_rx=300000, detect_mult=3,
sha1_key=None, bfd_key_id=None):
self._test = test
self._interface = interface
self._required_min_rx = required_min_rx
self._detect_mult = detect_mult
self._sha1_key = sha1_key
- self._bfd_key_id = bfd_key_id if bfd_key_id else randint(0, 255)
+ if bfd_key_id is not None:
+ self._bfd_key_id = bfd_key_id
+ else:
+ self._bfd_key_id = randint(0, 255)
@property
def test(self):
self.local_addr_n,
self.peer_addr_n,
is_ipv6=is_ipv6)
+
+ def admin_down(self):
+ """ set bfd session admin-down """
+ is_ipv6 = 1 if AF_INET6 == self._af else 0
+ self.test.vapi.bfd_udp_session_set_flags(0,
+ self._interface.sw_if_index,
+ self.local_addr_n,
+ self.peer_addr_n,
+ is_ipv6=is_ipv6)