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os-ken/ryu/lib/packet/zebra.py

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# Copyright (C) 2017 Nippon Telegraph and Telephone Corporation.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Zebra protocol parser/serializer
Zebra Protocol is used to communicate with the zebra daemon.
"""
import abc
import socket
import struct
import logging
import netaddr
import six
from ryu.lib import addrconv
from ryu.lib import ip
from ryu.lib import stringify
from ryu.lib import type_desc
from . import packet_base
from . import bgp
from . import safi as packet_safi
LOG = logging.getLogger(__name__)
# Constants in quagga/lib/zebra.h
# Default Zebra TCP port
ZEBRA_PORT = 2600
# Zebra message types
ZEBRA_INTERFACE_ADD = 1
ZEBRA_INTERFACE_DELETE = 2
ZEBRA_INTERFACE_ADDRESS_ADD = 3
ZEBRA_INTERFACE_ADDRESS_DELETE = 4
ZEBRA_INTERFACE_UP = 5
ZEBRA_INTERFACE_DOWN = 6
ZEBRA_IPV4_ROUTE_ADD = 7
ZEBRA_IPV4_ROUTE_DELETE = 8
ZEBRA_IPV6_ROUTE_ADD = 9
ZEBRA_IPV6_ROUTE_DELETE = 10
ZEBRA_REDISTRIBUTE_ADD = 11
ZEBRA_REDISTRIBUTE_DELETE = 12
ZEBRA_REDISTRIBUTE_DEFAULT_ADD = 13
ZEBRA_REDISTRIBUTE_DEFAULT_DELETE = 14
ZEBRA_IPV4_NEXTHOP_LOOKUP = 15
ZEBRA_IPV6_NEXTHOP_LOOKUP = 16
ZEBRA_IPV4_IMPORT_LOOKUP = 17
ZEBRA_IPV6_IMPORT_LOOKUP = 18
ZEBRA_INTERFACE_RENAME = 19
ZEBRA_ROUTER_ID_ADD = 20
ZEBRA_ROUTER_ID_DELETE = 21
ZEBRA_ROUTER_ID_UPDATE = 22
ZEBRA_HELLO = 23
ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB = 24
ZEBRA_VRF_UNREGISTER = 25
ZEBRA_INTERFACE_LINK_PARAMS = 26
ZEBRA_NEXTHOP_REGISTER = 27
ZEBRA_NEXTHOP_UNREGISTER = 28
ZEBRA_NEXTHOP_UPDATE = 29
ZEBRA_MESSAGE_MAX = 30
# Zebra route types
ZEBRA_ROUTE_SYSTEM = 0
ZEBRA_ROUTE_KERNEL = 1
ZEBRA_ROUTE_CONNECT = 2
ZEBRA_ROUTE_STATIC = 3
ZEBRA_ROUTE_RIP = 4
ZEBRA_ROUTE_RIPNG = 5
ZEBRA_ROUTE_OSPF = 6
ZEBRA_ROUTE_OSPF6 = 7
ZEBRA_ROUTE_ISIS = 8
ZEBRA_ROUTE_BGP = 9
ZEBRA_ROUTE_PIM = 10
ZEBRA_ROUTE_HSLS = 11
ZEBRA_ROUTE_OLSR = 12
ZEBRA_ROUTE_BABEL = 13
ZEBRA_ROUTE_MAX = 14
# Zebra message flags
ZEBRA_FLAG_INTERNAL = 0x01
ZEBRA_FLAG_SELFROUTE = 0x02
ZEBRA_FLAG_BLACKHOLE = 0x04
ZEBRA_FLAG_IBGP = 0x08
ZEBRA_FLAG_SELECTED = 0x10
ZEBRA_FLAG_FIB_OVERRIDE = 0x20
ZEBRA_FLAG_STATIC = 0x40
ZEBRA_FLAG_REJECT = 0x80
# Zebra nexthop flags
ZEBRA_NEXTHOP_IFINDEX = 1
ZEBRA_NEXTHOP_IFNAME = 2
ZEBRA_NEXTHOP_IPV4 = 3
ZEBRA_NEXTHOP_IPV4_IFINDEX = 4
ZEBRA_NEXTHOP_IPV4_IFNAME = 5
ZEBRA_NEXTHOP_IPV6 = 6
ZEBRA_NEXTHOP_IPV6_IFINDEX = 7
ZEBRA_NEXTHOP_IPV6_IFNAME = 8
ZEBRA_NEXTHOP_BLACKHOLE = 9
# Constants in quagga/lib/zclient.h
# Zebra API message flags
ZAPI_MESSAGE_NEXTHOP = 0x01
ZAPI_MESSAGE_IFINDEX = 0x02
ZAPI_MESSAGE_DISTANCE = 0x04
ZAPI_MESSAGE_METRIC = 0x08
ZAPI_MESSAGE_MTU = 0x10
ZAPI_MESSAGE_TAG = 0x20
# Constants in quagga/lib/if.h
# Interface name length
# Linux define value in /usr/include/linux/if.h.
# #define IFNAMSIZ 16
# FreeBSD define value in /usr/include/net/if.h.
# #define IFNAMSIZ 16
INTERFACE_NAMSIZE = 20
INTERFACE_HWADDR_MAX = 20
# Zebra internal interface status
ZEBRA_INTERFACE_ACTIVE = 1 << 0
ZEBRA_INTERFACE_SUB = 1 << 1
ZEBRA_INTERFACE_LINKDETECTION = 1 << 2
# Zebra link layer types
ZEBRA_LLT_UNKNOWN = 0
ZEBRA_LLT_ETHER = 1
ZEBRA_LLT_EETHER = 2
ZEBRA_LLT_AX25 = 3
ZEBRA_LLT_PRONET = 4
ZEBRA_LLT_IEEE802 = 5
ZEBRA_LLT_ARCNET = 6
ZEBRA_LLT_APPLETLK = 7
ZEBRA_LLT_DLCI = 8
ZEBRA_LLT_ATM = 9
ZEBRA_LLT_METRICOM = 10
ZEBRA_LLT_IEEE1394 = 11
ZEBRA_LLT_EUI64 = 12
ZEBRA_LLT_INFINIBAND = 13
ZEBRA_LLT_SLIP = 14
ZEBRA_LLT_CSLIP = 15
ZEBRA_LLT_SLIP6 = 16
ZEBRA_LLT_CSLIP6 = 17
ZEBRA_LLT_RSRVD = 18
ZEBRA_LLT_ADAPT = 19
ZEBRA_LLT_ROSE = 20
ZEBRA_LLT_X25 = 21
ZEBRA_LLT_PPP = 22
ZEBRA_LLT_CHDLC = 23
ZEBRA_LLT_LAPB = 24
ZEBRA_LLT_RAWHDLC = 25
ZEBRA_LLT_IPIP = 26
ZEBRA_LLT_IPIP6 = 27
ZEBRA_LLT_FRAD = 28
ZEBRA_LLT_SKIP = 29
ZEBRA_LLT_LOOPBACK = 30
ZEBRA_LLT_LOCALTLK = 31
ZEBRA_LLT_FDDI = 32
ZEBRA_LLT_SIT = 33
ZEBRA_LLT_IPDDP = 34
ZEBRA_LLT_IPGRE = 35
ZEBRA_LLT_IP6GRE = 36
ZEBRA_LLT_PIMREG = 37
ZEBRA_LLT_HIPPI = 38
ZEBRA_LLT_ECONET = 39
ZEBRA_LLT_IRDA = 40
ZEBRA_LLT_FCPP = 41
ZEBRA_LLT_FCAL = 42
ZEBRA_LLT_FCPL = 43
ZEBRA_LLT_FCFABRIC = 44
ZEBRA_LLT_IEEE802_TR = 45
ZEBRA_LLT_IEEE80211 = 46
ZEBRA_LLT_IEEE80211_RADIOTAP = 47
ZEBRA_LLT_IEEE802154 = 48
ZEBRA_LLT_IEEE802154_PHY = 49
# "non-official" architectural constants
MAX_CLASS_TYPE = 8
# Utility functions/classes
IPv4Prefix = bgp.IPAddrPrefix
IPv6Prefix = bgp.IP6AddrPrefix
def _parse_ip_prefix(family, buf):
if family == socket.AF_INET:
prefix, rest = bgp.IPAddrPrefix.parser(buf)
elif family == socket.AF_INET6:
prefix, rest = IPv6Prefix.parser(buf)
else:
raise struct.error('Unsupported family: %d' % family)
return prefix.prefix, rest
def _serialize_ip_prefix(prefix):
if ip.valid_ipv4(prefix):
prefix_addr, prefix_num = prefix.split('/')
return bgp.IPAddrPrefix(int(prefix_num), prefix_addr).serialize()
elif ip.valid_ipv6(prefix):
prefix_addr, prefix_num = prefix.split('/')
return IPv6Prefix(int(prefix_num), prefix_addr).serialize()
else:
raise ValueError('Invalid prefix: %s' % prefix)
class InterfaceLinkParams(stringify.StringifyMixin):
"""
Interface Link Parameters class for if_link_params structure.
"""
# Interface Link Parameters structure:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Status of Link Parameters |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Traffic Engineering metric |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (float) Maximum Bandwidth |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (float) Maximum Reservable Bandwidth |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (float) Unreserved Bandwidth per Class Type * MAX_CLASS_TYPE |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Administrative group |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Remote AS number |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Remote IP address |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Link Average Delay |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Link Min Delay |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Link Max Delay |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Link Delay Variation |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (float) Link Packet Loss |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (float) Residual Bandwidth |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (float) Available Bandwidth |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (float) Utilized Bandwidth |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_HEADER_FMT = '!IIff'
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
_REPEATED_FMT = '!f'
REPEATED_SIZE = struct.calcsize(_REPEATED_FMT)
_FOOTER_FMT = '!II4sIIIIffff'
FOOTER_SIZE = struct.calcsize(_FOOTER_FMT)
def __init__(self, lp_status, te_metric, max_bw, max_reserved_bw,
unreserved_bw, admin_group, remote_as, remote_ip,
average_delay, min_delay, max_delay, delay_var, pkt_loss,
residual_bw, average_bw, utilized_bw):
super(InterfaceLinkParams, self).__init__()
self.lp_status = lp_status
self.te_metric = te_metric
self.max_bw = max_bw
self.max_reserved_bw = max_reserved_bw
assert isinstance(unreserved_bw, (list, tuple))
assert len(unreserved_bw) == MAX_CLASS_TYPE
self.unreserved_bw = unreserved_bw
self.admin_group = admin_group
self.remote_as = remote_as
assert netaddr.valid_ipv4(remote_ip)
self.remote_ip = remote_ip
self.average_delay = average_delay
self.min_delay = min_delay
self.max_delay = max_delay
self.delay_var = delay_var
self.pkt_loss = pkt_loss
self.residual_bw = residual_bw
self.average_bw = average_bw
self.utilized_bw = utilized_bw
@classmethod
def parse(cls, buf):
(lp_status, te_metric, max_bw,
max_reserved_bw) = struct.unpack_from(cls._HEADER_FMT, buf)
offset = cls.HEADER_SIZE
unreserved_bw = []
for _ in range(MAX_CLASS_TYPE):
(u_bw,) = struct.unpack_from(cls._REPEATED_FMT, buf, offset)
unreserved_bw.append(u_bw)
offset += cls.REPEATED_SIZE
(admin_group, remote_as, remote_ip, average_delay, min_delay,
max_delay, delay_var, pkt_loss, residual_bw, average_bw,
utilized_bw) = struct.unpack_from(
cls._FOOTER_FMT, buf, offset)
offset += cls.FOOTER_SIZE
remote_ip = addrconv.ipv4.bin_to_text(remote_ip)
return cls(lp_status, te_metric, max_bw, max_reserved_bw,
unreserved_bw, admin_group, remote_as, remote_ip,
average_delay, min_delay, max_delay, delay_var, pkt_loss,
residual_bw, average_bw, utilized_bw), buf[offset:]
def serialize(self):
buf = struct.pack(
self._HEADER_FMT, self.lp_status, self.te_metric, self.max_bw,
self.max_reserved_bw)
for u_bw in self.unreserved_bw:
buf += struct.pack(self._REPEATED_FMT, u_bw)
remote_ip = addrconv.ipv4.text_to_bin(self.remote_ip)
buf += struct.pack(
self._FOOTER_FMT, self.admin_group, self.remote_as, remote_ip,
self.average_delay, self.min_delay, self.max_delay,
self.delay_var, self.pkt_loss, self.residual_bw, self.average_bw,
self.utilized_bw)
return buf
@six.add_metaclass(abc.ABCMeta)
class _NextHop(type_desc.TypeDisp, stringify.StringifyMixin):
"""
Base class for Zebra Nexthop structure.
"""
# Zebra Nexthop structure:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthop Type |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 address or Interface Index number (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_HEADER_FMT = '!B'
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
def __init__(self, ifindex=None, ifname=None, addr=None, type_=None):
super(_NextHop, self).__init__()
self.ifindex = ifindex
self.ifname = ifname
self.addr = addr
if type_ is None:
type_ = self._rev_lookup_type(self.__class__)
self.type = type_
@classmethod
@abc.abstractmethod
def parse(cls, buf):
(type_,) = struct.unpack_from(cls._HEADER_FMT, buf)
rest = buf[cls.HEADER_SIZE:]
subcls = cls._lookup_type(type_)
if subcls is None:
raise struct.error('unsupported Nexthop type: %d' % type_)
return subcls.parse(rest)
@abc.abstractmethod
def _serialize(self):
return b''
def serialize(self):
return struct.pack(self._HEADER_FMT, self.type) + self._serialize()
_NEXTHOP_COUNT_FMT = '!B' # nexthop_count
_NEXTHOP_COUNT_SIZE = struct.calcsize(_NEXTHOP_COUNT_FMT)
def _parse_nexthops(buf):
(nexthop_count,) = struct.unpack_from(_NEXTHOP_COUNT_FMT, buf)
rest = buf[_NEXTHOP_COUNT_SIZE:]
nexthops = []
for _ in range(nexthop_count):
nexthop, rest = _NextHop.parse(rest)
nexthops.append(nexthop)
return nexthops, rest
def _serialize_nexthops(nexthops):
nexthop_count = len(nexthops)
buf = struct.pack(_NEXTHOP_COUNT_FMT, nexthop_count)
if nexthop_count == 0:
return buf
for nexthop in nexthops:
buf += nexthop.serialize()
return buf
@_NextHop.register_type(ZEBRA_NEXTHOP_IFINDEX)
class NextHopIFIndex(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_IFINDEX type.
"""
_BODY_FMT = '!I' # ifindex
BODY_SIZE = struct.calcsize(_BODY_FMT)
@classmethod
def parse(cls, buf):
(ifindex,) = struct.unpack_from(cls._BODY_FMT, buf)
rest = buf[cls.BODY_SIZE:]
return cls(ifindex=ifindex), rest
def _serialize(self):
return struct.pack(self._BODY_FMT, self.ifindex)
@_NextHop.register_type(ZEBRA_NEXTHOP_IFNAME)
class NextHopIFName(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_IFNAME type.
"""
_BODY_FMT = '!I' # ifindex
BODY_SIZE = struct.calcsize(_BODY_FMT)
@classmethod
def parse(cls, buf):
(ifindex,) = struct.unpack_from(cls._BODY_FMT, buf)
rest = buf[cls.BODY_SIZE:]
return cls(ifindex=ifindex), rest
def _serialize(self):
return struct.pack(self._BODY_FMT, self.ifindex)
@_NextHop.register_type(ZEBRA_NEXTHOP_IPV4)
class NextHopIPv4(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_IPV4 type.
"""
_BODY_FMT = '!4s' # addr(IPv4)
BODY_SIZE = struct.calcsize(_BODY_FMT)
@classmethod
def parse(cls, buf):
addr = addrconv.ipv4.bin_to_text(buf[:cls.BODY_SIZE])
rest = buf[cls.BODY_SIZE:]
return cls(addr=addr), rest
def _serialize(self):
return addrconv.ipv4.text_to_bin(self.addr)
@_NextHop.register_type(ZEBRA_NEXTHOP_IPV4_IFINDEX)
class NextHopIPv4IFIndex(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_IPV4_IFINDEX type.
"""
_BODY_FMT = '!4sI' # addr(IPv4), ifindex
BODY_SIZE = struct.calcsize(_BODY_FMT)
@classmethod
def parse(cls, buf):
(addr, ifindex) = struct.unpack_from(cls._BODY_FMT, buf)
addr = addrconv.ipv4.bin_to_text(addr)
rest = buf[cls.BODY_SIZE:]
return cls(ifindex=ifindex, addr=addr), rest
def _serialize(self):
addr = addrconv.ipv4.text_to_bin(self.addr)
return struct.pack(self._BODY_FMT, addr, self.ifindex)
@_NextHop.register_type(ZEBRA_NEXTHOP_IPV4_IFNAME)
class NextHopIPv4IFName(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_IPV4_IFNAME type.
"""
_BODY_FMT = '!4sI' # addr(IPv4), ifindex
BODY_SIZE = struct.calcsize(_BODY_FMT)
@classmethod
def parse(cls, buf):
(addr, ifindex) = struct.unpack_from(cls._BODY_FMT, buf)
addr = addrconv.ipv4.bin_to_text(addr)
rest = buf[cls.BODY_SIZE:]
return cls(ifindex=ifindex, addr=addr), rest
def _serialize(self):
addr = addrconv.ipv4.text_to_bin(self.addr)
return struct.pack(self._BODY_FMT, addr, self.ifindex)
@_NextHop.register_type(ZEBRA_NEXTHOP_IPV6)
class NextHopIPv6(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_IPV6 type.
"""
_BODY_FMT = '!16s' # addr(IPv6)
BODY_SIZE = struct.calcsize(_BODY_FMT)
@classmethod
def parse(cls, buf):
addr = addrconv.ipv6.bin_to_text(buf[:cls.BODY_SIZE])
rest = buf[cls.BODY_SIZE:]
return cls(addr=addr), rest
def _serialize(self):
return addrconv.ipv6.text_to_bin(self.addr)
@_NextHop.register_type(ZEBRA_NEXTHOP_IPV6_IFINDEX)
class NextHopIPv6IFIndex(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_IPV6_IFINDEX type.
"""
_BODY_FMT = '!16sI' # addr(IPv6), ifindex
BODY_SIZE = struct.calcsize(_BODY_FMT)
@classmethod
def parse(cls, buf):
(addr, ifindex) = struct.unpack_from(cls._BODY_FMT, buf)
addr = addrconv.ipv6.bin_to_text(addr)
rest = buf[cls.BODY_SIZE:]
return cls(ifindex=ifindex, addr=addr), rest
def _serialize(self):
addr = addrconv.ipv6.text_to_bin(self.addr)
return struct.pack(self._BODY_FMT, addr, self.ifindex)
@_NextHop.register_type(ZEBRA_NEXTHOP_IPV6_IFNAME)
class NextHopIPv6IFName(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_IPV6_IFNAME type.
"""
_BODY_FMT = '!16sI' # addr(IPv6), ifindex
BODY_SIZE = struct.calcsize(_BODY_FMT)
@classmethod
def parse(cls, buf):
(addr, ifindex) = struct.unpack_from(cls._BODY_FMT, buf)
addr = addrconv.ipv6.bin_to_text(addr)
rest = buf[cls.BODY_SIZE:]
return cls(ifindex=ifindex, addr=addr), rest
def _serialize(self):
addr = addrconv.ipv6.text_to_bin(self.addr)
return struct.pack(self._BODY_FMT, addr, self.ifindex)
@_NextHop.register_type(ZEBRA_NEXTHOP_BLACKHOLE)
class NextHopBlackhole(_NextHop):
"""
Nexthop class for ZEBRA_NEXTHOP_BLACKHOLE type.
"""
@classmethod
def parse(cls, buf):
return cls(), buf
def _serialize(self):
return b''
class RegisteredNexthop(stringify.StringifyMixin):
"""
Unit of ZEBRA_NEXTHOP_REGISTER message body.
"""
# Unit of Zebra Nexthop Register message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Connected | Family |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 Prefix (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_HEADER_FMT = '!?H'
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
def __init__(self, connected, family, prefix):
super(RegisteredNexthop, self).__init__()
self.connected = connected
self.family = family
if isinstance(prefix, (IPv4Prefix, IPv6Prefix)):
prefix = prefix.prefix
self.prefix = prefix
@classmethod
def parse(cls, buf):
(connected, family) = struct.unpack_from(cls._HEADER_FMT, buf)
rest = buf[cls.HEADER_SIZE:]
prefix, rest = _parse_ip_prefix(family, rest)
return cls(connected, family, prefix), rest
def serialize(self):
buf = struct.pack(self._HEADER_FMT, self.connected, self.family)
return buf + _serialize_ip_prefix(self.prefix)
# Zebra message class
class ZebraMessage(packet_base.PacketBase):
"""
Zebra protocol parser/serializer class.
An instance has the following attributes at least.
Most of them are same to the on-wire counterparts but in host byte order.
__init__ takes the corresponding args in this order.
============== ==========================================================
Attribute Description
============== ==========================================================
length Total packet length including this header.
The minimum length is 3 bytes for version 0 messages,
6 bytes for version 1/2 messages and 8 bytes for version
3 messages.
version Version number of the Zebra protocol message.
To instantiate messages with other than the default
version, ``version`` must be specified.
vrf_id VRF ID for the route contained in message.
Not present in version 0/1/2 messages in the on-wire
structure, and always 0 for theses version.
command Zebra Protocol command, which denotes message type.
body Messages body.
An instance of subclass of ``_ZebraMessageBody`` named
like "Zebra + <message name>" (e.g., ``ZebraHello``).
Or ``None`` if message does not contain any body.
============== ==========================================================
.. Note::
To instantiate Zebra messages, ``command`` can be omitted when the
valid ``body`` is specified.
::
>>> from ryu.lib.packet import zebra
>>> zebra.ZebraMessage(body=zebra.ZebraHello())
ZebraMessage(body=ZebraHello(route_type=14),command=23,
length=None,version=3,vrf_id=0)
On the other hand, if ``body`` is omitted, ``command`` must be
specified.
::
>>> zebra.ZebraMessage(command=zebra.ZEBRA_INTERFACE_ADD)
ZebraMessage(body=None,command=1,length=None,version=3,vrf_id=0)
"""
# Zebra Protocol Common Header (version 0):
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Length | Command |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_V0_HEADER_FMT = '!HB'
V0_HEADER_SIZE = struct.calcsize(_V0_HEADER_FMT)
_MIN_LEN = V0_HEADER_SIZE
# Zebra Protocol Common Header (version 1):
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Length | Marker | Version |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Command |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_V1_HEADER_FMT = '!HBBH'
V1_HEADER_SIZE = struct.calcsize(_V1_HEADER_FMT)
# Zebra Protocol Common Header (version 3):
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Length | Marker | Version |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | VRF ID | Command |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_V3_HEADER_FMT = '!HBBHH'
V3_HEADER_SIZE = struct.calcsize(_V3_HEADER_FMT)
# Default Zebra protocol version
_DEFAULT_VERSION = 3
# Note: Marker should be 0xff(=255) in the version>=1 header.
_MARKER = 0xff
def __init__(self, length=None, version=_DEFAULT_VERSION,
vrf_id=0, command=None, body=None):
super(ZebraMessage, self).__init__()
self.length = length
self.version = version
self.vrf_id = vrf_id
if body is None:
assert command is not None
else:
assert isinstance(body, _ZebraMessageBody)
if command is None:
command = _ZebraMessageBody.rev_lookup_command(body.__class__)
self.command = command
self.body = body
@classmethod
def get_header_size(cls, version):
if version == 0:
return cls.V0_HEADER_SIZE
elif version in [1, 2]:
return cls.V1_HEADER_SIZE
elif version == 3:
return cls.V3_HEADER_SIZE
else:
raise ValueError(
'Unsupported Zebra protocol version: %d'
% version)
@classmethod
def parse_header(cls, buf):
(length, marker) = struct.unpack_from(cls._V0_HEADER_FMT, buf)
if marker != cls._MARKER:
command = marker
body_buf = buf[cls.V0_HEADER_SIZE:length]
# version=0, vrf_id=0
return length, 0, 0, command, body_buf
(length, marker, version, command) = struct.unpack_from(
cls._V1_HEADER_FMT, buf)
if version in [1, 2]:
body_buf = buf[cls.V1_HEADER_SIZE:length]
# vrf_id=0
return length, version, 0, command, body_buf
(length, marker, version, vrf_id, command) = struct.unpack_from(
cls._V3_HEADER_FMT, buf)
if version == 3:
body_buf = buf[cls.V3_HEADER_SIZE:length]
return length, version, vrf_id, command, body_buf
raise struct.error(
'Failed to parse Zebra protocol header: '
'marker=%d, version=%d' % (marker, version))
@classmethod
def _parser_impl(cls, buf, body_parser='parse'):
buf = six.binary_type(buf)
(length, version, vrf_id, command,
body_buf) = cls.parse_header(buf)
if body_buf:
body_cls = _ZebraMessageBody.lookup_command(command)
_parser = getattr(body_cls, body_parser)
body = _parser(body_buf)
else:
body = None
rest = buf[length:]
return cls(length, version, vrf_id, command, body), cls, rest
@classmethod
def parser(cls, buf):
return cls._parser_impl(buf)
def serialize_header(self, body_len):
if self.version == 0:
self.length = self.V0_HEADER_SIZE + body_len # fixup
return struct.pack(
self._V0_HEADER_FMT,
self.length, self.command)
elif self.version in [1, 2]:
self.length = self.V1_HEADER_SIZE + body_len # fixup
return struct.pack(
self._V1_HEADER_FMT,
self.length, self._MARKER, self.version,
self.command)
elif self.version == 3:
self.length = self.V3_HEADER_SIZE + body_len # fixup
return struct.pack(
self._V3_HEADER_FMT,
self.length, self._MARKER, self.version,
self.vrf_id, self.command)
else:
raise ValueError(
'Unsupported Zebra protocol version: %d'
% self.version)
def serialize(self, _payload=None, _prev=None):
if isinstance(self.body, _ZebraMessageBody):
body = self.body.serialize()
else:
body = b''
return self.serialize_header(len(body)) + body
class _ZebraMessageFromZebra(ZebraMessage):
"""
This class is corresponding to the message sent from Zebra daemon.
"""
@classmethod
def parser(cls, buf):
return cls._parser_impl(buf, body_parser='parse_from_zebra')
# Alias
zebra = ZebraMessage
# Zebra message body classes
class _ZebraMessageBody(type_desc.TypeDisp, stringify.StringifyMixin):
"""
Base class for Zebra message body.
"""
@classmethod
def lookup_command(cls, command):
return cls._lookup_type(command)
@classmethod
def rev_lookup_command(cls, body_cls):
return cls._rev_lookup_type(body_cls)
@classmethod
def parse(cls, buf):
return cls()
@classmethod
def parse_from_zebra(cls, buf):
return cls.parse(buf)
def serialize(self):
return b''
@_ZebraMessageBody.register_unknown_type()
class ZebraUnknownMessage(_ZebraMessageBody):
"""
Message body class for Unknown command.
"""
def __init__(self, buf):
super(ZebraUnknownMessage, self).__init__()
self.buf = buf
@classmethod
def parse(cls, buf):
return cls(buf)
def serialize(self):
return self.buf
@six.add_metaclass(abc.ABCMeta)
class _ZebraInterface(_ZebraMessageBody):
"""
Base class for ZEBRA_INTERFACE_ADD, ZEBRA_INTERFACE_DELETE,
ZEBRA_INTERFACE_UP and ZEBRA_INTERFACE_DOWN message body.
"""
# Zebra Interface Add/Delete message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Interface Name (INTERFACE_NAMSIZE bytes length) |
# | |
# | |
# | |
# | |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Interface index |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | status |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Interface flags |
# | |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Metric |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Interface's MTU for IPv4 |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Interface's MTU for IPv6 |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Bandwidth |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (Link Layer Type) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Hardware Address Length |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Hardware Address if HW length different from 0 |
# | ... max is INTERFACE_HWADDR_MAX |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | link_params? | Whether a link-params follows: 1 or 0.
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Link params 0 or 1 INTERFACE_LINK_PARAMS_SIZE sized |
# | .... (struct if_link_params). |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_HEADER_FMT = '!%dsIBQIIIIII' % INTERFACE_NAMSIZE
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
_HEADER_SHORT_FMT = '!%dsIBQIIIII' % INTERFACE_NAMSIZE
HEADER_SHORT_SIZE = struct.calcsize(_HEADER_SHORT_FMT)
# link_params_state (whether a link-params follows)
_LP_STATE_FMT = '!?'
LP_STATE_SIZE = struct.calcsize(_LP_STATE_FMT)
# See InterfaceLinkParams class for Link params structure
def __init__(self, ifname, ifindex, status, if_flags,
metric, ifmtu, ifmtu6, bandwidth,
ll_type=None, hw_addr_len=0, hw_addr=None,
link_params=None):
super(_ZebraInterface, self).__init__()
self.ifname = ifname
self.ifindex = ifindex
self.status = status
self.if_flags = if_flags
self.metric = metric
self.ifmtu = ifmtu
self.ifmtu6 = ifmtu6
self.bandwidth = bandwidth
self.ll_type = ll_type
self.hw_addr_lenght = hw_addr_len
hw_addr = hw_addr or b''
self.hw_addr = hw_addr
assert (isinstance(link_params, InterfaceLinkParams)
or link_params is None)
self.link_params = link_params
@classmethod
def parse(cls, buf):
ll_type = None
if (len(buf) == cls.HEADER_SHORT_SIZE + 6 # with MAC addr
or len(buf) == cls.HEADER_SHORT_SIZE): # without MAC addr
# Assumption: Case for version<=2
(ifname, ifindex, status, if_flags, metric,
ifmtu, ifmtu6, bandwidth,
hw_addr_len) = struct.unpack_from(cls._HEADER_SHORT_FMT, buf)
rest = buf[cls.HEADER_SHORT_SIZE:]
else:
(ifname, ifindex, status, if_flags, metric,
ifmtu, ifmtu6, bandwidth, ll_type,
hw_addr_len) = struct.unpack_from(cls._HEADER_FMT, buf)
rest = buf[cls.HEADER_SIZE:]
ifname = str(six.text_type(ifname.strip(b'\x00'), 'ascii'))
hw_addr_len = min(hw_addr_len, INTERFACE_HWADDR_MAX)
hw_addr_bin = rest[:hw_addr_len]
rest = rest[hw_addr_len:]
if 0 < hw_addr_len < 7:
# Assuming MAC address
hw_addr = addrconv.mac.bin_to_text(
hw_addr_bin + b'\x00' * (6 - hw_addr_len))
else:
# Unknown hardware address
hw_addr = hw_addr_bin
if not rest:
return cls(ifname, ifindex, status, if_flags, metric,
ifmtu, ifmtu6, bandwidth, ll_type,
hw_addr_len, hw_addr)
(link_param_state,) = struct.unpack_from(cls._LP_STATE_FMT, rest)
rest = rest[cls.LP_STATE_SIZE:]
if link_param_state:
link_params, rest = InterfaceLinkParams.parse(rest)
else:
link_params = None
return cls(ifname, ifindex, status, if_flags, metric, ifmtu, ifmtu6,
bandwidth, ll_type, hw_addr_len, hw_addr, link_params)
def serialize(self):
# fixup
if netaddr.valid_mac(self.hw_addr):
# MAC address
hw_addr_len = 6
hw_addr = addrconv.mac.text_to_bin(self.hw_addr)
else:
# Unknown hardware address
hw_addr_len = len(self.hw_addr)
hw_addr = self.hw_addr
if self.ll_type:
# Assumption: version<=2
buf = struct.pack(
self._HEADER_FMT,
self.ifname.encode('ascii'), self.ifindex, self.status,
self.if_flags, self.metric, self.ifmtu, self.ifmtu6,
self.bandwidth, self.ll_type, hw_addr_len) + hw_addr
else:
buf = struct.pack(
self._HEADER_SHORT_FMT,
self.ifname.encode('ascii'), self.ifindex, self.status,
self.if_flags, self.metric, self.ifmtu, self.ifmtu6,
self.bandwidth, hw_addr_len) + hw_addr
if isinstance(self.link_params, InterfaceLinkParams):
buf += struct.pack(self._LP_STATE_FMT, True)
buf += self.link_params.serialize()
elif self.ll_type is None:
# Assumption: version<=2
pass
else:
buf += struct.pack(self._LP_STATE_FMT, False)
return buf
@_ZebraMessageBody.register_type(ZEBRA_INTERFACE_ADD)
class ZebraInterfaceAdd(_ZebraInterface):
"""
Message body class for ZEBRA_INTERFACE_ADD.
"""
@_ZebraMessageBody.register_type(ZEBRA_INTERFACE_DELETE)
class ZebraInterfaceDelete(_ZebraInterface):
"""
Message body class for ZEBRA_INTERFACE_DELETE.
"""
@six.add_metaclass(abc.ABCMeta)
class _ZebraInterfaceAddress(_ZebraMessageBody):
"""
Base class for ZEBRA_INTERFACE_ADDRESS_ADD and
ZEBRA_INTERFACE_ADDRESS_DELETE message body.
"""
# Zebra Interface Address Add/Delete message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Interface index |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IFC Flags | flags for connected address
# +-+-+-+-+-+-+-+-+
# | Family |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 Prefix (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Prefix len |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 Destination Address (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_HEADER_FMT = '!IBB' # ifindex, ifc_flags, family
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
_IPV4_BODY_FMT = '!4sB4s' # prefix, prefix_len, dest
_IPV6_BODY_FMT = '!16sB16s'
def __init__(self, ifindex, ifc_flags, family, prefix, dest):
super(_ZebraInterfaceAddress, self).__init__()
self.ifindex = ifindex
self.ifc_flags = ifc_flags
self.family = family
if isinstance(prefix, (IPv4Prefix, IPv6Prefix)):
prefix = prefix.prefix
self.prefix = prefix
assert netaddr.valid_ipv4(dest) or netaddr.valid_ipv6(dest)
self.dest = dest
@classmethod
def parse(cls, buf):
(ifindex, ifc_flags,
family) = struct.unpack_from(cls._HEADER_FMT, buf)
rest = buf[cls.HEADER_SIZE:]
if socket.AF_INET == family:
(prefix, p_len,
dest) = struct.unpack_from(cls._IPV4_BODY_FMT, rest)
prefix = '%s/%d' % (addrconv.ipv4.bin_to_text(prefix), p_len)
dest = addrconv.ipv4.bin_to_text(dest)
elif socket.AF_INET6 == family:
(prefix, p_len,
dest) = struct.unpack_from(cls._IPV6_BODY_FMT, rest)
prefix = '%s/%d' % (addrconv.ipv6.bin_to_text(prefix), p_len)
dest = addrconv.ipv6.bin_to_text(dest)
else:
raise struct.error('Unsupported family: %d' % family)
return cls(ifindex, ifc_flags, family, prefix, dest)
def serialize(self):
if ip.valid_ipv4(self.prefix):
self.family = socket.AF_INET # fixup
prefix_addr, prefix_num = self.prefix.split('/')
body_bin = struct.pack(
self._IPV4_BODY_FMT,
addrconv.ipv4.text_to_bin(prefix_addr),
int(prefix_num),
addrconv.ipv4.text_to_bin(self.dest))
elif ip.valid_ipv6(self.prefix):
self.family = socket.AF_INET6 # fixup
prefix_addr, prefix_num = self.prefix.split('/')
body_bin = struct.pack(
self._IPV6_BODY_FMT,
addrconv.ipv6.text_to_bin(prefix_addr),
int(prefix_num),
addrconv.ipv6.text_to_bin(self.dest))
else:
raise ValueError(
'Invalid address family for prefix=%s and dest=%s'
% (self.prefix, self.dest))
buf = struct.pack(self._HEADER_FMT,
self.ifindex, self.ifc_flags, self.family)
return buf + body_bin
@_ZebraMessageBody.register_type(ZEBRA_INTERFACE_ADDRESS_ADD)
class ZebraInterfaceAddressAdd(_ZebraInterfaceAddress):
"""
Message body class for ZEBRA_INTERFACE_ADDRESS_ADD.
"""
@_ZebraMessageBody.register_type(ZEBRA_INTERFACE_ADDRESS_DELETE)
class ZebraInterfaceAddressDelete(_ZebraInterfaceAddress):
"""
Message body class for ZEBRA_INTERFACE_ADDRESS_DELETE.
"""
@_ZebraMessageBody.register_type(ZEBRA_INTERFACE_UP)
class ZebraInterfaceUp(_ZebraInterface):
"""
Message body class for ZEBRA_INTERFACE_UP.
"""
@_ZebraMessageBody.register_type(ZEBRA_INTERFACE_DOWN)
class ZebraInterfaceDown(_ZebraInterface):
"""
Message body class for ZEBRA_INTERFACE_DOWN.
"""
@six.add_metaclass(abc.ABCMeta)
class _ZebraIPRoute(_ZebraMessageBody):
"""
Base class for ZEBRA_IPV4_ROUTE_* and ZEBRA_IPV6_ROUTE_*
message body.
.. Note::
Zebra IPv4/IPv6 Route message have asymmetric structure.
If the message sent from Zebra Daemon, set 'from_zebra=True' to
create an instance of this class.
"""
# Zebra IPv4/IPv6 Route message body (Protocol Daemons -> Zebra Daemon):
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Route Type | Flags | Message |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | SAFI |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 Prefix (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthop Num |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthops (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (Distance) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (Metric) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (MTU) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (TAG) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#
# Zebra IPv4/IPv6 Route message body (Zebra Daemon -> Protocol Daemons):
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Route Type | Flags | Message |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 Prefix (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (Nexthop Num) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (Nexthops (Variable)) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (IFIndex Num) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (Interface indexes) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (Distance) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (Metric) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (MTU) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | (TAG) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_HEADER_FMT = '!BBB' # type, flags, message
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
_SAFI_FMT = '!H' # safi
SAFI_SIZE = struct.calcsize(_SAFI_FMT)
_NUM_FMT = '!B' # nexthop_num or ifindex_num
NUM_SIZE = struct.calcsize(_NUM_FMT)
_IFINDEX_FMT = '!I' # ifindex
IFINDEX_SIZE = struct.calcsize(_IFINDEX_FMT)
# API type specific constants
_FAMILY = None # either socket.AF_INET or socket.AF_INET6
def __init__(self, route_type, flags, message, safi=None, prefix=None,
nexthops=None, ifindexes=None,
distance=None, metric=None, mtu=None, tag=None,
from_zebra=False):
super(_ZebraIPRoute, self).__init__()
self.route_type = route_type
self.flags = flags
self.message = message
# SAFI should be included if this message sent to Zebra.
if from_zebra:
self.safi = None
else:
self.safi = safi or packet_safi.UNICAST
assert prefix is not None
if isinstance(prefix, (IPv4Prefix, IPv6Prefix)):
prefix = prefix.prefix
self.prefix = prefix
# Nexthops should be a list of str representations of IP address
# if this message sent from Zebra, otherwise a list of _Nexthop
# subclasses.
nexthops = nexthops or []
if from_zebra:
for nexthop in nexthops:
assert (netaddr.valid_ipv4(nexthop)
or netaddr.valid_ipv6(nexthop))
else:
for nexthop in nexthops:
assert isinstance(nexthop, _NextHop)
self.nexthops = nexthops
# Interface indexes should be included if this message sent from
# Zebra.
if from_zebra:
ifindexes = ifindexes or []
for ifindex in ifindexes:
assert isinstance(ifindex, six.integer_types)
self.ifindexes = ifindexes
else:
self.ifindexes = None
self.distance = distance
self.metric = metric
self.mtu = mtu
self.tag = tag
# is this message sent from Zebra message or not.
self.from_zebra = from_zebra
@classmethod
def _parse_message_option(cls, message, flag, fmt, buf):
if message & flag:
(option,) = struct.unpack_from(fmt, buf)
return option, buf[struct.calcsize(fmt):]
else:
return None, buf
@classmethod
def _parse_impl(cls, buf, from_zebra=False):
(route_type, flags, message,) = struct.unpack_from(
cls._HEADER_FMT, buf)
rest = buf[cls.HEADER_SIZE:]
if from_zebra:
safi = None
else:
(safi,) = struct.unpack_from(cls._SAFI_FMT, rest)
rest = rest[cls.SAFI_SIZE:]
prefix, rest = _parse_ip_prefix(cls._FAMILY, rest)
if from_zebra and message & ZAPI_MESSAGE_NEXTHOP:
nexthops = []
(nexthop_num,) = struct.unpack_from(cls._NUM_FMT, rest)
rest = rest[cls.NUM_SIZE:]
if cls._FAMILY == socket.AF_INET:
for _ in range(nexthop_num):
nexthop = addrconv.ipv4.bin_to_text(rest[:4])
nexthops.append(nexthop)
rest = rest[4:]
else: # cls._FAMILY == socket.AF_INET6:
for _ in range(nexthop_num):
nexthop = addrconv.ipv6.bin_to_text(rest[:16])
nexthops.append(nexthop)
rest = rest[16:]
else:
nexthops, rest = _parse_nexthops(rest)
ifindexes = []
if from_zebra and message & ZAPI_MESSAGE_IFINDEX:
(ifindex_num,) = struct.unpack_from(cls._NUM_FMT, rest)
rest = rest[cls.NUM_SIZE:]
for _ in range(ifindex_num):
(ifindex,) = struct.unpack_from(cls._IFINDEX_FMT, rest)
ifindexes.append(ifindex)
rest = rest[cls.IFINDEX_SIZE:]
distance, rest = cls._parse_message_option(
message, ZAPI_MESSAGE_DISTANCE, '!B', rest)
metric, rest = cls._parse_message_option(
message, ZAPI_MESSAGE_METRIC, '!I', rest)
mtu, rest = cls._parse_message_option(
message, ZAPI_MESSAGE_MTU, '!I', rest)
tag, rest = cls._parse_message_option(
message, ZAPI_MESSAGE_TAG, '!I', rest)
return cls(route_type, flags, message, safi, prefix,
nexthops, ifindexes,
distance, metric, mtu, tag,
from_zebra=from_zebra)
@classmethod
def parse(cls, buf):
return cls._parse_impl(buf)
@classmethod
def parse_from_zebra(cls, buf):
return cls._parse_impl(buf, from_zebra=True)
def _serialize_message_option(self, option, flag, fmt):
if option is None:
return b''
# fixup
self.message |= flag
return struct.pack(fmt, option)
def serialize(self):
prefix = _serialize_ip_prefix(self.prefix)
nexthops = b''
if self.nexthops:
self.message |= ZAPI_MESSAGE_NEXTHOP # fixup
if self.from_zebra:
nexthops += struct.pack(self._NUM_FMT, len(self.nexthops))
for nexthop in self.nexthops:
nexthops += ip.text_to_bin(nexthop)
else:
nexthops = _serialize_nexthops(self.nexthops)
ifindexes = b''
if self.ifindexes and self.from_zebra:
self.message |= ZAPI_MESSAGE_IFINDEX # fixup
ifindexes += struct.pack(self._NUM_FMT, len(self.ifindexes))
for ifindex in self.ifindexes:
ifindexes += struct.pack(self._IFINDEX_FMT, ifindex)
options = self._serialize_message_option(
self.distance, ZAPI_MESSAGE_DISTANCE, '!B')
options += self._serialize_message_option(
self.metric, ZAPI_MESSAGE_METRIC, '!I')
options += self._serialize_message_option(
self.mtu, ZAPI_MESSAGE_MTU, '!I')
options += self._serialize_message_option(
self.tag, ZAPI_MESSAGE_TAG, '!I')
header = struct.pack(
self._HEADER_FMT, self.route_type, self.flags, self.message)
if not self.from_zebra:
header += struct.pack(self._SAFI_FMT, self.safi)
return header + prefix + nexthops + ifindexes + options
class _ZebraIPv4Route(_ZebraIPRoute):
"""
Base class for ZEBRA_IPV4_ROUTE_* message body.
"""
_FAMILY = socket.AF_INET
@_ZebraMessageBody.register_type(ZEBRA_IPV4_ROUTE_ADD)
class ZebraIPv4RouteAdd(_ZebraIPv4Route):
"""
Message body class for ZEBRA_IPV4_ROUTE_ADD.
"""
@_ZebraMessageBody.register_type(ZEBRA_IPV4_ROUTE_DELETE)
class ZebraIPv4RouteDelete(_ZebraIPv4Route):
"""
Message body class for ZEBRA_IPV4_ROUTE_DELETE.
"""
class _ZebraIPv6Route(_ZebraIPRoute):
"""
Base class for ZEBRA_IPV6_ROUTE_* message body.
"""
_FAMILY = socket.AF_INET6
@_ZebraMessageBody.register_type(ZEBRA_IPV6_ROUTE_ADD)
class ZebraIPv6RouteAdd(_ZebraIPv6Route):
"""
Message body class for ZEBRA_IPV6_ROUTE_ADD.
"""
@_ZebraMessageBody.register_type(ZEBRA_IPV6_ROUTE_DELETE)
class ZebraIPv6RouteDelete(_ZebraIPv6Route):
"""
Message body class for ZEBRA_IPV6_ROUTE_DELETE.
"""
@six.add_metaclass(abc.ABCMeta)
class _ZebraRedistribute(_ZebraMessageBody):
"""
Base class for ZEBRA_REDISTRIBUTE_ADD and ZEBRA_REDISTRIBUTE_DELETE
message body.
"""
# Zebra Redistribute message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Route Type |
# +-+-+-+-+-+-+-+-+
_HEADER_FMT = '!B'
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
def __init__(self, route_type):
super(_ZebraRedistribute, self).__init__()
self.route_type = route_type
@classmethod
def parse(cls, buf):
(route_type,) = struct.unpack_from(cls._HEADER_FMT, buf)
return cls(route_type)
def serialize(self):
return struct.pack(self._HEADER_FMT, self.route_type)
@_ZebraMessageBody.register_type(ZEBRA_REDISTRIBUTE_ADD)
class ZebraRedistributeAdd(_ZebraRedistribute):
"""
Message body class for ZEBRA_REDISTRIBUTE_ADD.
"""
@_ZebraMessageBody.register_type(ZEBRA_REDISTRIBUTE_DELETE)
class ZebraRedistributeDelete(_ZebraRedistribute):
"""
Message body class for ZEBRA_REDISTRIBUTE_DELETE.
"""
@six.add_metaclass(abc.ABCMeta)
class _ZebraRedistributeDefault(_ZebraMessageBody):
"""
Base class for ZEBRA_REDISTRIBUTE_DEFAULT_ADD and
ZEBRA_REDISTRIBUTE_DEFAULT_DELETE message body.
"""
@_ZebraMessageBody.register_type(ZEBRA_REDISTRIBUTE_DEFAULT_ADD)
class ZebraRedistributeDefaultAdd(_ZebraRedistribute):
"""
Message body class for ZEBRA_REDISTRIBUTE_DEFAULT_ADD.
"""
@_ZebraMessageBody.register_type(ZEBRA_REDISTRIBUTE_DEFAULT_DELETE)
class ZebraRedistributeDefaultDelete(_ZebraRedistribute):
"""
Message body class for ZEBRA_REDISTRIBUTE_DEFAULT_DELETE.
"""
@six.add_metaclass(abc.ABCMeta)
class _ZebraIPNexthopLookup(_ZebraMessageBody):
"""
Base class for ZEBRA_IPV4_NEXTHOP_LOOKUP and
ZEBRA_IPV6_NEXTHOP_LOOKUP message body.
"""
# Zebra IPv4/v6 Nexthop Lookup message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 address |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Metric |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthop Num |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthops (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_METRIC_FMT = '!I' # metric
METRIC_SIZE = struct.calcsize(_METRIC_FMT)
# Message type specific constants
ADDR_CLS = None # either addrconv.ipv4 or addrconv.ipv6
ADDR_LEN = None # IP address length in bytes
def __init__(self, addr, metric=None, nexthops=None):
super(_ZebraIPNexthopLookup, self).__init__()
assert netaddr.valid_ipv4(addr) or netaddr.valid_ipv6(addr)
self.addr = addr
self.metric = metric
nexthops = nexthops or []
for nexthop in nexthops:
assert isinstance(nexthop, _NextHop)
self.nexthops = nexthops
@classmethod
def parse(cls, buf):
addr = cls.ADDR_CLS.bin_to_text(buf[:cls.ADDR_LEN])
rest = buf[cls.ADDR_LEN:]
metric = None
if rest:
# Note: Case for ZEBRA_IPV4_NEXTHOP_LOOKUP request
(metric,) = struct.unpack_from(cls._METRIC_FMT, rest)
rest = rest[cls.METRIC_SIZE:]
nexthops = None
if rest:
nexthops, rest = _parse_nexthops(rest)
return cls(addr, metric, nexthops)
def serialize(self):
buf = self.ADDR_CLS.text_to_bin(self.addr)
if self.metric is None:
return buf
buf += struct.pack(self._METRIC_FMT, self.metric)
return buf + _serialize_nexthops(self.nexthops)
@_ZebraMessageBody.register_type(ZEBRA_IPV4_NEXTHOP_LOOKUP)
class ZebraIPv4NexthopLookup(_ZebraIPNexthopLookup):
"""
Message body class for ZEBRA_IPV4_NEXTHOP_LOOKUP.
"""
ADDR_CLS = addrconv.ipv4
ADDR_LEN = 4
@_ZebraMessageBody.register_type(ZEBRA_IPV6_NEXTHOP_LOOKUP)
class ZebraIPv6NexthopLookup(_ZebraIPNexthopLookup):
"""
Message body class for ZEBRA_IPV6_NEXTHOP_LOOKUP.
"""
ADDR_CLS = addrconv.ipv6
ADDR_LEN = 16
@six.add_metaclass(abc.ABCMeta)
class _ZebraIPImportLookup(_ZebraMessageBody):
"""
Base class for ZEBRA_IPV4_IMPORT_LOOKUP and
ZEBRA_IPV6_IMPORT_LOOKUP message body.
"""
# Zebra IPv4/v6 Import Lookup message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 prefix |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Metric |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthop Num |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthops (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_METRIC_FMT = '!I' # metric
METRIC_SIZE = struct.calcsize(_METRIC_FMT)
# Message type specific constants
PREFIX_CLS = None # either addrconv.ipv4 or addrconv.ipv6
PREFIX_LEN = None # IP prefix length in bytes
def __init__(self, prefix, metric=None, nexthops=None):
super(_ZebraIPImportLookup, self).__init__()
assert netaddr.valid_ipv4(prefix) or netaddr.valid_ipv6(prefix)
self.prefix = prefix
self.metric = metric
nexthops = nexthops or []
for nexthop in nexthops:
assert isinstance(nexthop, _NextHop)
self.nexthops = nexthops
@classmethod
def parse(cls, buf):
prefix = cls.PREFIX_CLS.bin_to_text(buf[:cls.PREFIX_LEN])
rest = buf[cls.PREFIX_LEN:]
metric = None
if rest:
(metric,) = struct.unpack_from(cls._METRIC_FMT, rest)
rest = rest[cls.METRIC_SIZE:]
nexthops = None
if rest:
nexthops, rest = _parse_nexthops(rest)
return cls(prefix, metric, nexthops)
def serialize(self):
buf = self.PREFIX_CLS.text_to_bin(self.prefix)
if self.metric is None:
return buf
buf += struct.pack(self._METRIC_FMT, self.metric)
return buf + _serialize_nexthops(self.nexthops)
@_ZebraMessageBody.register_type(ZEBRA_IPV4_IMPORT_LOOKUP)
class ZebraIPv4ImportLookup(_ZebraIPImportLookup):
"""
Message body class for ZEBRA_IPV4_IMPORT_LOOKUP.
"""
PREFIX_CLS = addrconv.ipv4
PREFIX_LEN = 4
@_ZebraMessageBody.register_type(ZEBRA_IPV6_IMPORT_LOOKUP)
class ZebraIPv6ImportLookup(_ZebraIPImportLookup):
"""
Message body class for ZEBRA_IPV6_IMPORT_LOOKUP.
"""
PREFIX_CLS = addrconv.ipv6
PREFIX_LEN = 16
# Note: Not implemented in quagga/zebra/zserv.c
# @_ZebraMessageBody.register_type(ZEBRA_INTERFACE_RENAME)
# class ZebraInterfaceRename(_ZebraMessageBody):
@_ZebraMessageBody.register_type(ZEBRA_ROUTER_ID_ADD)
class ZebraRouterIDAdd(_ZebraMessageBody):
"""
Message body class for ZEBRA_ROUTER_ID_ADD.
"""
@_ZebraMessageBody.register_type(ZEBRA_ROUTER_ID_DELETE)
class ZebraRouterIDDelete(_ZebraMessageBody):
"""
Message body class for ZEBRA_ROUTER_ID_DELETE.
"""
@_ZebraMessageBody.register_type(ZEBRA_ROUTER_ID_UPDATE)
class ZebraRouterIDUpdate(_ZebraMessageBody):
"""
Message body class for ZEBRA_ROUTER_ID_UPDATE.
"""
# Zebra Router ID Update message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Family |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 prefix |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Prefix len |
# +-+-+-+-+-+-+-+-+
_FAMILY_FMT = '!B'
FAMILY_SIZE = struct.calcsize(_FAMILY_FMT)
_IPV4_BODY_FMT = '!4sB' # prefix, prefix_len
_IPV6_BODY_FMT = '!16sB'
def __init__(self, family, prefix):
super(ZebraRouterIDUpdate, self).__init__()
self.family = family
if isinstance(prefix, (IPv4Prefix, IPv6Prefix)):
prefix = prefix.prefix
self.prefix = prefix
@classmethod
def parse(cls, buf):
(family,) = struct.unpack_from(cls._FAMILY_FMT, buf)
rest = buf[cls.FAMILY_SIZE:]
if socket.AF_INET == family:
(prefix, p_len) = struct.unpack_from(cls._IPV4_BODY_FMT, rest)
prefix = '%s/%d' % (addrconv.ipv4.bin_to_text(prefix), p_len)
elif socket.AF_INET6 == family:
(prefix, p_len) = struct.unpack_from(cls._IPV6_BODY_FMT, rest)
prefix = '%s/%d' % (addrconv.ipv6.bin_to_text(prefix), p_len)
else:
raise struct.error('Unsupported family: %d' % family)
return cls(family, prefix)
def serialize(self):
if ip.valid_ipv4(self.prefix):
self.family = socket.AF_INET # fixup
prefix_addr, prefix_num = self.prefix.split('/')
body_bin = struct.pack(
self._IPV4_BODY_FMT,
addrconv.ipv4.text_to_bin(prefix_addr),
int(prefix_num))
elif ip.valid_ipv6(self.prefix):
self.family = socket.AF_INET6 # fixup
prefix_addr, prefix_num = self.prefix.split('/')
body_bin = struct.pack(
self._IPV6_BODY_FMT,
addrconv.ipv6.text_to_bin(prefix_addr),
int(prefix_num))
else:
raise ValueError('Invalid prefix: %s' % self.prefix)
return struct.pack(self._FAMILY_FMT, self.family) + body_bin
@_ZebraMessageBody.register_type(ZEBRA_HELLO)
class ZebraHello(_ZebraMessageBody):
"""
Message body class for ZEBRA_HELLO.
"""
# Zebra Hello message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Route Type |
# +-+-+-+-+-+-+-+-+
_HEADER_FMT = '!B'
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
def __init__(self, route_type=ZEBRA_ROUTE_MAX):
super(ZebraHello, self).__init__()
self.route_type = route_type
@classmethod
def parse(cls, buf):
route_type = None
if buf:
(route_type,) = struct.unpack_from(cls._HEADER_FMT, buf)
return cls(route_type)
def serialize(self):
return struct.pack(self._HEADER_FMT, self.route_type)
@six.add_metaclass(abc.ABCMeta)
class _ZebraIPNexthopLookupMRib(_ZebraMessageBody):
"""
Base class for ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB (and
ZEBRA_IPV6_NEXTHOP_LOOKUP_MRIB) message body.
"""
# Zebra IPv4/v6 Nexthop Lookup MRIB message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 address |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Distance |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Metric |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthop Num |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthops (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_DISTANCE_METRIC_FMT = '!I' # metric
DISTANCE_METRIC_SIZE = struct.calcsize(_DISTANCE_METRIC_FMT)
# Message type specific constants
ADDR_CLS = None # either addrconv.ipv4 or addrconv.ipv6
ADDR_LEN = None # IP address length in bytes
def __init__(self, addr, distance, metric, nexthops=None):
super(_ZebraIPNexthopLookupMRib, self).__init__()
assert netaddr.valid_ipv4(addr) or netaddr.valid_ipv6(addr)
self.addr = addr
self.distance = distance
self.metric = metric
nexthops = nexthops or []
for nexthop in nexthops:
assert isinstance(nexthop, _NextHop)
self.nexthops = nexthops
@classmethod
def parse(cls, buf):
addr = cls.ADDR_CLS.bin_to_text(buf[:cls.ADDR_LEN])
rest = buf[cls.ADDR_LEN:]
(metric,) = struct.unpack_from(cls._DISTANCE_METRIC_FMT, rest)
rest = rest[cls.DISTANCE_METRIC_SIZE:]
nexthops, rest = _parse_nexthops(rest)
return cls(addr, metric, nexthops)
def serialize(self):
buf = self.ADDR_CLS.text_to_bin(self.addr)
buf += struct.pack(
self._DISTANCE_METRIC_FMT, self.distance, self.metric)
return buf + self._serialize_nexthops(self.nexthops)
@_ZebraMessageBody.register_type(ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB)
class ZebraIPv4NexthopLookupMRib(_ZebraIPNexthopLookupMRib):
"""
Message body class for ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB.
"""
ADDR_CLS = addrconv.ipv4
ADDR_LEN = 4
@_ZebraMessageBody.register_type(ZEBRA_VRF_UNREGISTER)
class ZebraVrfUnregister(_ZebraMessageBody):
"""
Message body class for ZEBRA_VRF_UNREGISTER.
"""
@_ZebraMessageBody.register_type(ZEBRA_INTERFACE_LINK_PARAMS)
class ZebraInterfaceLinkParams(_ZebraMessageBody):
"""
Message body class for ZEBRA_INTERFACE_LINK_PARAMS.
"""
# Zebra Interface Link Parameters message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Interface Index |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Interface Link Parameters |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_HEADER_FMT = '!I' # ifindex
HEADER_SIZE = struct.calcsize(_HEADER_FMT)
# See InterfaceLinkParams class for Interface Link Parameters structure
def __init__(self, ifindex, link_params):
super(ZebraInterfaceLinkParams, self).__init__()
self.ifindex = ifindex
assert isinstance(link_params, InterfaceLinkParams)
self.link_params = link_params
@classmethod
def parse(cls, buf):
(ifindex,) = struct.unpack_from(cls._HEADER_FMT, buf)
rest = buf[cls.HEADER_SIZE:]
link_params, rest = InterfaceLinkParams.parse(rest)
return cls(ifindex, link_params)
def serialize(self):
buf = struct.pack(self._HEADER_FMT, self.ifindex)
return buf + self.link_params.serialize()
class _ZebraNexthopRegister(_ZebraMessageBody):
"""
Base class for ZEBRA_NEXTHOP_REGISTER and ZEBRA_NEXTHOP_UNREGISTER
message body.
"""
# Zebra Nexthop Register message body:
# (Repeat of RegisteredNexthop class)
def __init__(self, nexthops):
super(_ZebraNexthopRegister, self).__init__()
nexthops = nexthops or []
for nexthop in nexthops:
assert isinstance(nexthop, RegisteredNexthop)
self.nexthops = nexthops
@classmethod
def parse(cls, buf):
nexthops = []
while buf:
nexthop, buf = RegisteredNexthop.parse(buf)
nexthops.append(nexthop)
return cls(nexthops)
def serialize(self):
buf = b''
for nexthop in self.nexthops:
buf += nexthop.serialize()
return buf
@_ZebraMessageBody.register_type(ZEBRA_NEXTHOP_REGISTER)
class ZebraNexthopRegister(_ZebraNexthopRegister):
"""
Message body class for ZEBRA_NEXTHOP_REGISTER.
"""
@_ZebraMessageBody.register_type(ZEBRA_NEXTHOP_UNREGISTER)
class ZebraNexthopUnregister(_ZebraNexthopRegister):
"""
Message body class for ZEBRA_NEXTHOP_UNREGISTER.
"""
@_ZebraMessageBody.register_type(ZEBRA_NEXTHOP_UPDATE)
class ZebraNexthopUpdate(_ZebraMessageBody):
"""
Message body class for ZEBRA_NEXTHOP_UPDATE.
"""
# Zebra IPv4/v6 Nexthop Update message body:
# 0 1 2 3
# 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Family |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | IPv4/v6 prefix |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Metric |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthop Num |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
# | Nexthops (Variable) |
# +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
_FAMILY_FMT = '!H' # family
FAMILY_SIZE = struct.calcsize(_FAMILY_FMT)
_METRIC_FMT = '!I' # metric
METRIC_SIZE = struct.calcsize(_METRIC_FMT)
def __init__(self, family, prefix, metric, nexthops=None):
super(ZebraNexthopUpdate, self).__init__()
self.family = family
if isinstance(prefix, (IPv4Prefix, IPv6Prefix)):
prefix = prefix.prefix
self.prefix = prefix
self.metric = metric
nexthops = nexthops or []
for nexthop in nexthops:
assert isinstance(nexthop, _NextHop)
self.nexthops = nexthops
@classmethod
def parse(cls, buf):
(family,) = struct.unpack_from(cls._FAMILY_FMT, buf)
rest = buf[cls.FAMILY_SIZE:]
prefix, rest = _parse_ip_prefix(family, rest)
(metric,) = struct.unpack_from(cls._METRIC_FMT, rest)
rest = rest[cls.METRIC_SIZE:]
nexthops, rest = _parse_nexthops(rest)
return cls(family, prefix, metric, nexthops)
def serialize(self):
# fixup
if ip.valid_ipv4(self.prefix):
self.family = socket.AF_INET
elif ip.valid_ipv6(self.prefix):
self.family = socket.AF_INET6
else:
raise ValueError('Invalid prefix: %s' % self.prefix)
buf = struct.pack(self._FAMILY_FMT, self.family)
buf += _serialize_ip_prefix(self.prefix)
buf += struct.pack(self._METRIC_FMT, self.metric)
return buf + _serialize_nexthops(self.nexthops)
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