diff options
Diffstat (limited to 'test/bfd.py')
| -rw-r--r-- | test/bfd.py | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/test/bfd.py b/test/bfd.py new file mode 100644 index 00000000..452a1804 --- /dev/null +++ b/test/bfd.py @@ -0,0 +1,459 @@ +""" BFD protocol implementation """ + +from random import randint +from socket import AF_INET, AF_INET6, inet_pton +from scapy.all import bind_layers +from scapy.layers.inet import UDP +from scapy.packet import Packet +from scapy.fields import BitField, BitEnumField, XByteField, FlagsField,\ + ConditionalField, StrField +from vpp_object import VppObject +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 BFDAuthType(NumericConstant): + """ BFD Authentication Type """ + no_auth = 0 + simple_pwd = 1 + keyed_md5 = 2 + meticulous_keyed_md5 = 3 + keyed_sha1 = 4 + meticulous_keyed_sha1 = 5 + + desc_dict = { + no_auth: "No authentication", + simple_pwd: "Simple Password", + keyed_md5: "Keyed MD5", + meticulous_keyed_md5: "Meticulous Keyed MD5", + keyed_sha1: "Keyed SHA1", + meticulous_keyed_sha1: "Meticulous Keyed SHA1", + } + + def __init__(self, value): + NumericConstant.__init__(self, value) + + +def bfd_is_auth_used(pkt): + """ is packet authenticated? """ + return "A" in pkt.sprintf("%BFD.flags%") + + +def bfd_is_simple_pwd_used(pkt): + """ is simple password authentication used? """ + return bfd_is_auth_used(pkt) and pkt.auth_type == BFDAuthType.simple_pwd + + +def bfd_is_sha1_used(pkt): + """ is sha1 authentication used? """ + return bfd_is_auth_used(pkt) and pkt.auth_type in \ + (BFDAuthType.keyed_sha1, BFDAuthType.meticulous_keyed_sha1) + + +def bfd_is_md5_used(pkt): + """ is md5 authentication used? """ + return bfd_is_auth_used(pkt) and pkt.auth_type in \ + (BFDAuthType.keyed_md5, BFDAuthType.meticulous_keyed_md5) + + +def bfd_is_md5_or_sha1_used(pkt): + """ is md5 or sha1 used? """ + return bfd_is_md5_used(pkt) or bfd_is_sha1_used(pkt) + + +class BFD(Packet): + """ 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 + sha1_auth_len = 28 # : length of authentication section if SHA1 used + + 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, ['M', 'D', 'A', 'C', 'F', 'P']), + XByteField("detect_mult", 0), + BitField("length", bfd_pkt_len, 8), + 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), + ConditionalField( + BitEnumField("auth_type", 0, 8, BFDAuthType.desc_dict), + bfd_is_auth_used), + ConditionalField(BitField("auth_len", 0, 8), bfd_is_auth_used), + ConditionalField(BitField("auth_key_id", 0, 8), bfd_is_auth_used), + ConditionalField(BitField("auth_reserved", 0, 8), + bfd_is_md5_or_sha1_used), + ConditionalField( + BitField("auth_seq_num", 0, 32), bfd_is_md5_or_sha1_used), + ConditionalField(StrField("auth_key_hash", "0" * 16), bfd_is_md5_used), + ConditionalField( + StrField("auth_key_hash", "0" * 20), bfd_is_sha1_used), + ] + + 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 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 """ + + def __init__(self, test, conf_key_id, auth_type, key): + self._test = test + self._key = key + self._auth_type = auth_type + test.assertIn(auth_type, BFDAuthType.desc_dict) + self._conf_key_id = conf_key_id + + @property + def test(self): + """ Test which created this key """ + return self._test + + @property + def auth_type(self): + """ Authentication type for this key """ + return self._auth_type + + @property + def key(self): + """ key data """ + return self._key + + @key.setter + def key(self, value): + self._key = value + + @property + def conf_key_id(self): + """ configuration key ID """ + return self._conf_key_id + + def add_vpp_config(self): + self.test.vapi.bfd_auth_set_key( + self._conf_key_id, self._auth_type, self._key) + self._test.registry.register(self, self.test.logger) + + def get_bfd_auth_keys_dump_entry(self): + """ get the entry in the auth keys dump corresponding to this key """ + result = self.test.vapi.bfd_auth_keys_dump() + for k in result: + if k.conf_key_id == self._conf_key_id: + return k + return None + + def query_vpp_config(self): + return self.get_bfd_auth_keys_dump_entry() is not None + + def remove_vpp_config(self): + self.test.vapi.bfd_auth_del_key(self._conf_key_id) + + def object_id(self): + return "bfd-auth-key-%s" % self._conf_key_id + + def __str__(self): + return self.object_id() + + +class VppBFDUDPSession(VppObject): + """ Represents BFD UDP session in VPP """ + + def __init__(self, test, interface, peer_addr, local_addr=None, af=AF_INET, + 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._af = af + self._local_addr = local_addr + if local_addr is not None: + self._local_addr_n = inet_pton(af, local_addr) + else: + self._local_addr_n = None + self._peer_addr = peer_addr + self._peer_addr_n = inet_pton(af, peer_addr) + self._desired_min_tx = desired_min_tx + self._required_min_rx = required_min_rx + self._detect_mult = detect_mult + self._sha1_key = sha1_key + 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): + """ 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 local_addr(self): + """ BFD session local address (VPP address) """ + if self._local_addr is None: + if self.af == AF_INET: + return self._interface.local_ip4 + elif self.af == AF_INET6: + return self._interface.local_ip6 + else: + raise Exception("Unexpected af '%s'" % self.af) + 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: + if self.af == AF_INET: + return self._interface.local_ip4n + elif self.af == AF_INET6: + return self._interface.local_ip6n + else: + raise Exception("Unexpected af '%s'" % self.af) + 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 + + def get_bfd_udp_session_dump_entry(self): + """ get the namedtuple entry from bfd udp session dump """ + result = self.test.vapi.bfd_udp_session_dump() + for s in result: + self.test.logger.debug("session entry: %s" % str(s)) + 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]: + return s + if self.af == AF_INET6 \ + and s.is_ipv6 == 1 \ + and self.interface.local_ip6n == s.local_addr \ + and self.interface.remote_ip6n == s.peer_addr: + return s + return None + + @property + def state(self): + """ BFD session state """ + session = self.get_bfd_udp_session_dump_entry() + if session is None: + raise Exception("Could not find BFD session in VPP response") + return session.state + + @property + def desired_min_tx(self): + """ desired minimum tx interval """ + return self._desired_min_tx + + @property + def required_min_rx(self): + """ required minimum rx interval """ + return self._required_min_rx + + @property + def detect_mult(self): + """ detect multiplier """ + return self._detect_mult + + @property + def sha1_key(self): + """ sha1 key """ + return self._sha1_key + + @property + def bfd_key_id(self): + """ bfd key id in use """ + return self._bfd_key_id + + def activate_auth(self, key, bfd_key_id=None, delayed=False): + """ activate authentication for this session """ + self._bfd_key_id = bfd_key_id if bfd_key_id else randint(0, 255) + self._sha1_key = key + is_ipv6 = 1 if AF_INET6 == self.af else 0 + conf_key_id = self._sha1_key.conf_key_id + is_delayed = 1 if delayed else 0 + self.test.vapi.bfd_udp_auth_activate(self._interface.sw_if_index, + self.local_addr_n, + self.peer_addr_n, + is_ipv6=is_ipv6, + bfd_key_id=self._bfd_key_id, + conf_key_id=conf_key_id, + is_delayed=is_delayed) + + def deactivate_auth(self, delayed=False): + """ deactivate authentication """ + self._bfd_key_id = None + self._sha1_key = None + is_delayed = 1 if delayed else 0 + is_ipv6 = 1 if AF_INET6 == self.af else 0 + self.test.vapi.bfd_udp_auth_deactivate(self._interface.sw_if_index, + self.local_addr_n, + self.peer_addr_n, + is_ipv6=is_ipv6, + is_delayed=is_delayed) + + def modify_parameters(self, + detect_mult=None, + desired_min_tx=None, + required_min_rx=None): + """ modify session parameters """ + if detect_mult: + self._detect_mult = detect_mult + if desired_min_tx: + self._desired_min_tx = desired_min_tx + if required_min_rx: + self._required_min_rx = required_min_rx + is_ipv6 = 1 if AF_INET6 == self.af else 0 + self.test.vapi.bfd_udp_mod(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) + + def add_vpp_config(self): + is_ipv6 = 1 if AF_INET6 == self.af else 0 + bfd_key_id = self._bfd_key_id if self._sha1_key else None + conf_key_id = self._sha1_key.conf_key_id if self._sha1_key else None + 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, + bfd_key_id=bfd_key_id, + conf_key_id=conf_key_id) + self._test.registry.register(self, self.test.logger) + + def query_vpp_config(self): + session = self.get_bfd_udp_session_dump_entry() + return session is not None + + def remove_vpp_config(self): + 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-%s-%s-%s-%s" % (self._interface.sw_if_index, + self.local_addr, + self.peer_addr, + self.af) + + def __str__(self): + return self.object_id() + + def admin_up(self): + """ set bfd session admin-up """ + is_ipv6 = 1 if AF_INET6 == self._af else 0 + self.test.vapi.bfd_udp_session_set_flags(1, + self._interface.sw_if_index, + 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) |