Differential D36002 Diff 111186 tests/sys/net/routing/netlink.py

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tests/sys/net/routing/netlink.py

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				#!/usr/local/bin/python3

				from ctypes import *
				import socket
				import os
				import sys
				import unittest
				import struct

				from enum import Enum, auto

				from typing import List, Callable, Dict, NamedTuple, Optional


				def roundup2(val: int, num: int) -> int:
				if val % num:
				return (val \| (num - 1)) + 1
				else:
				return val


				def align4(val: int) -> int:
				return roundup2(val, 4)


				class SockaddrNl(Structure):
				_fields_ = [
				("nl_len", c_ubyte),
				("nl_family", c_ubyte),
				("nl_pad", c_ushort),
				("nl_pid", c_uint),
				("nl_groups", c_uint),
				]


				class Nlmsghdr(Structure):
				_fields_ = [
				("nlmsg_len", c_uint),
				("nlmsg_type", c_ushort),
				("nlmsg_flags", c_ushort),
				("nlmsg_seq", c_uint),
				("nlmsg_pid", c_uint),
				]


				class Nlmsgerr(Structure):
				_fields_ = [
				("error", c_int),
				("msg", Nlmsghdr),
				]


				class NlErrattrType(Enum):
				NLMSGERR_ATTR_UNUSED = 0
				NLMSGERR_ATTR_MSG = auto()
				NLMSGERR_ATTR_OFFS = auto()
				NLMSGERR_ATTR_COOKIE = auto()
				NLMSGERR_ATTR_POLICY = auto()

				class RtattrType(Enum):
				Lint: PEP8 E302 Inline Actions expected 2 blank lines, found 1 Lint: PEP8 E302: expected 2 blank lines, found 1
				RTA_UNSPEC = 0
				RTA_DST = auto()
				RTA_SRC = auto()
				RTA_IIF = auto()
				RTA_OIF = auto()
				RTA_GATEWAY = auto()
				RTA_PRIORITY = auto()
				RTA_PREFSRC = auto()
				RTA_METRICS = auto()
				RTA_MULTIPATH = auto()
				RTA_PROTOINFO = auto()
				RTA_FLOW = auto()
				RTA_CACHEINFO = auto()
				RTA_SESSION = auto()
				RTA_MP_ALGO = auto()
				RTA_TABLE = auto()
				RTA_MARK = auto()
				RTA_MFC_STATS = auto()
				RTA_VIA = auto()
				RTA_NEWDST = auto()
				RTA_PREF = auto()
				RTA_ENCAP_TYPE = auto()
				RTA_ENCAP = auto()
				RTA_EXPIRES = auto()
				RTA_PAD = auto()
				RTA_UID = auto()
				RTA_TTL_PROPAGATE = auto()
				RTA_IP_PROTO = auto()
				RTA_SPORT = auto()
				RTA_DPORT = auto()
				RTA_NH_ID = auto()


				class NlMsgType(Enum):
				NLMSG_NOOP = 1
				NLMSG_ERROR = 2
				NLMSG_DONE = 3
				NLMSG_OVERRUN = 4


				class NlRtMsgType(Enum):
				RTM_NEWLINK = 16
				RTM_DELLINK = 17
				RTM_GETLINK = 18
				RTM_SETLINK = 19
				RTM_NEWADDR = 20
				RTM_DELADDR = 21
				RTM_GETADDR = 22
				RTM_NEWROUTE = 24
				RTM_DELROUTE = 25
				RTM_GETROUTE = 26
				RTM_NEWNEIGH = 28
				RTM_DELNEIGH = 27
				RTM_GETNEIGH = 28
				RTM_NEWRULE = 32
				RTM_DELRULE = 33
				RTM_GETRULE = 34
				RTM_NEWQDISC = 36
				RTM_DELQDISC = 37
				RTM_GETQDISC = 38
				RTM_NEWTCLASS = 40
				RTM_DELTCLASS = 41
				RTM_GETTCLASS = 42
				RTM_NEWTFILTER = 44
				RTM_DELTFILTER = 45
				RTM_GETTFILTER = 46
				RTM_NEWACTION = 48
				RTM_DELACTION = 49
				RTM_GETACTION = 50
				RTM_NEWPREFIX = 52
				RTM_GETMULTICAST = 58
				RTM_GETANYCAST = 62
				RTM_NEWNEIGHTBL = 64
				RTM_GETNEIGHTBL = 66
				RTM_SETNEIGHTBL = 67
				RTM_NEWNDUSEROPT = 68
				RTM_NEWADDRLABEL = 72
				RTM_DELADDRLABEL = 73
				RTM_GETADDRLABEL = 74
				RTM_GETDCB = 78
				RTM_SETDCB = 79
				RTM_NEWNETCONF = 80
				RTM_GETNETCONF = 82
				RTM_NEWMDB = 84
				RTM_DELMDB = 85
				RTM_GETMDB = 86
				RTM_NEWNSID = 88
				RTM_DELNSID = 89
				RTM_GETNSID = 90
				RTM_NEWSTATS = 92
				RTM_GETSTATS = 94


				class RtAttr(Structure):
				_fields_ = [
				("rta_len", c_ushort),
				("rta_type", c_ushort),
				]


				class RtMsgHdr(Structure):
				_fields_ = [
				("rtm_family", c_ubyte),
				("rtm_dst_len", c_ubyte),
				("rtm_src_len", c_ubyte),
				("rtm_tos", c_ubyte),
				("rtm_table", c_ubyte),
				("rtm_protocol", c_ubyte),
				("rtm_scope", c_ubyte),
				("rtm_type", c_ubyte),
				("rtm_flags", c_uint),
				]


				class RtMsgFlags(Enum):
				RTM_F_NOTIFY = 0x100
				RTM_F_CLONED = 0x200
				RTM_F_EQUALIZE = 0x400
				RTM_F_PREFIX = 0x800
				RTM_F_LOOKUP_TABLE = 0x1000
				RTM_F_FIB_MATCH = 0x2000
				RTM_F_OFFLOAD = 0x4000
				RTM_F_TRAP = 0x8000
				RTM_F_OFFLOAD_FAILED = 0x20000000


				class AddressFamilyLinux(Enum):
				AF_INET = socket.AF_INET
				AF_INET6 = socket.AF_INET6
				AF_NETLINK = 16


				class AddressFamilyBsd(Enum):
				AF_INET = socket.AF_INET
				AF_INET6 = socket.AF_INET6
				AF_NETLINK = 38


				class NlmBaseFlags(Enum):
				NLM_F_REQUEST = 0x01
				NLM_F_MULTI = 0x02
				NLM_F_ACK = 0x04
				NLM_F_ECHO = 0x08
				NLM_F_DUMP_INTR = 0x10
				NLM_F_DUMP_FILTERED = 0x20

				# XXX: in python3.8 it is possible to
				# class NlmGetFlags(Enum, NlmBaseFlags):


				class NlmGetFlags(Enum):
				NLM_F_ROOT = 0x100
				NLM_F_MATCH = 0x200
				NLM_F_ATOMIC = 0x400


				class NlmNewFlags(Enum):
				NLM_F_REPLACE = 0x100
				NLM_F_EXCL = 0x200
				NLM_F_CREATE = 0x400
				NLM_F_APPEND = 0x800


				class NlmDeleteFlags(Enum):
				NLM_F_NONREC = 0x100


				class NlmAckFlags(Enum):
				NLM_F_CAPPED = 0x100
				NLM_F_ACK_TLVS = 0x200


				class RtScope(Enum):
				RT_SCOPE_UNIVERSE = 0
				RT_SCOPE_SITE = 200
				RT_SCOPE_LINK = 253
				RT_SCOPE_HOST = 254
				RT_SCOPE_NOWHERE = 255


				class RtType(Enum):
				RTN_UNSPEC = 0
				RTN_UNICAST = auto()
				RTN_LOCAL = auto()
				RTN_BROADCAST = auto()
				RTN_ANYCAST = auto()
				RTN_MULTICAST = auto()
				RTN_BLACKHOLE = auto()
				RTN_UNREACHABLE = auto()
				RTN_PROHIBIT = auto()
				RTN_THROW = auto()
				RTN_NAT = auto()
				RTN_XRESOLVE = auto()


				class RtProto(Enum):
				RTPROT_UNSPEC = 0
				RTPROT_REDIRECT = 1
				RTPROT_KERNEL = 2
				RTPROT_BOOT = 3
				RTPROT_STATIC = 4
				RTPROT_GATED = 8
				RTPROT_RA = 9
				RTPROT_MRT = 10
				RTPROT_ZEBRA = 11
				RTPROT_BIRD = 12
				RTPROT_DNROUTED = 13
				RTPROT_XORP = 14
				RTPROT_NTK = 15
				RTPROT_DHCP = 16
				RTPROT_MROUTED = 17
				RTPROT_KEEPALIVED = 18
				RTPROT_BABEL = 42
				RTPROT_OPENR = 99
				RTPROT_BGP = 186
				RTPROT_ISIS = 187
				RTPROT_OSPF = 188
				RTPROT_RIP = 189
				RTPROT_EIGRP = 192


				class NlRtaxType(Enum):
				RTAX_UNSPEC = 0
				RTAX_LOCK = auto()
				RTAX_MTU = auto()
				RTAX_WINDOW = auto()
				RTAX_RTT = auto()
				RTAX_RTTVAR = auto()
				RTAX_SSTHRESH = auto()
				RTAX_CWND = auto()
				RTAX_ADVMSS = auto()
				RTAX_REORDERING = auto()
				RTAX_HOPLIMIT = auto()
				RTAX_INITCWND = auto()
				RTAX_FEATURES = auto()
				RTAX_RTO_MIN = auto()
				RTAX_INITRWND = auto()
				RTAX_QUICKACK = auto()
				RTAX_CC_ALGO = auto()
				RTAX_FASTOPEN_NO_COOKIE = auto()


				class NlRtGroup(Enum):
				RTNLGRP_NONE = 0
				RTNLGRP_LINK = auto()
				RTNLGRP_NOTIFY = auto()
				RTNLGRP_NEIGH = auto()
				RTNLGRP_TC = auto()
				RTNLGRP_IPV4_IFADDR = auto()
				RTNLGRP_IPV4_MROUTE = auto()
				RTNLGRP_IPV4_ROUTE = auto()
				RTNLGRP_IPV4_RULE = auto()
				RTNLGRP_IPV6_IFADDR = auto()
				RTNLGRP_IPV6_MROUTE = auto()
				RTNLGRP_IPV6_ROUTE = auto()
				RTNLGRP_IPV6_IFINFO = auto()
				RTNLGRP_DECnet_IFADDR = auto()
				RTNLGRP_NOP2 = auto()
				RTNLGRP_DECnet_ROUTE = auto()
				RTNLGRP_DECnet_RULE = auto()
				RTNLGRP_NOP4 = auto()
				RTNLGRP_IPV6_PREFIX = auto()
				RTNLGRP_IPV6_RULE = auto()
				RTNLGRP_ND_USEROPT = auto()
				RTNLGRP_PHONET_IFADDR = auto()
				RTNLGRP_PHONET_ROUTE = auto()
				RTNLGRP_DCB = auto()
				RTNLGRP_IPV4_NETCONF = auto()
				RTNLGRP_IPV6_NETCONF = auto()
				RTNLGRP_MDB = auto()
				RTNLGRP_MPLS_ROUTE = auto()
				RTNLGRP_NSID = auto()
				RTNLGRP_MPLS_NETCONF = auto()
				RTNLGRP_IPV4_MROUTE_R = auto()
				RTNLGRP_IPV6_MROUTE_R = auto()
				RTNLGRP_NEXTHOP = auto()
				RTNLGRP_BRVLAN = auto()


				class IfinfoMsg(Structure):
				_fields_ = [
				("ifi_family", c_ubyte),
				("__ifi_pad", c_ubyte),
				("ifi_type", c_ushort),
				("ifi_index", c_int),
				("ifi_flags", c_uint),
				("ifi_change", c_uint),
				]


				class IflattrType(Enum):
				IFLA_UNSPEC = 0
				IFLA_ADDRESS = auto()
				IFLA_BROADCAST = auto()
				IFLA_IFNAME = auto()
				IFLA_MTU = auto()
				IFLA_LINK = auto()
				IFLA_QDISC = auto()
				IFLA_STATS = auto()
				IFLA_COST = auto()
				IFLA_PRIORITY = auto()
				IFLA_MASTER = auto()
				IFLA_WIRELESS = auto()
				IFLA_PROTINFO = auto()
				IFLA_TXQLEN = auto()
				IFLA_MAP = auto()
				IFLA_WEIGHT = auto()
				IFLA_OPERSTATE = auto()
				IFLA_LINKMODE = auto()
				IFLA_LINKINFO = auto()
				IFLA_NET_NS_PID = auto()
				IFLA_IFALIAS = auto()
				IFLA_NUM_VF = auto()
				IFLA_VFINFO_LIST = auto()
				IFLA_STATS64 = auto()
				IFLA_VF_PORTS = auto()
				IFLA_PORT_SELF = auto()
				IFLA_AF_SPEC = auto()
				IFLA_GROUP = auto()
				IFLA_NET_NS_FD = auto()
				IFLA_EXT_MASK = auto()
				IFLA_PROMISCUITY = auto()
				IFLA_NUM_TX_QUEUES = auto()
				IFLA_NUM_RX_QUEUES = auto()
				IFLA_CARRIER = auto()
				IFLA_PHYS_PORT_ID = auto()
				IFLA_CARRIER_CHANGES = auto()
				IFLA_PHYS_SWITCH_ID = auto()
				IFLA_LINK_NETNSID = auto()
				IFLA_PHYS_PORT_NAME = auto()
				IFLA_PROTO_DOWN = auto()
				IFLA_GSO_MAX_SEGS = auto()
				IFLA_GSO_MAX_SIZE = auto()
				IFLA_PAD = auto()
				IFLA_XDP = auto()
				IFLA_EVENT = auto()
				IFLA_NEW_NETNSID = auto()
				IFLA_IF_NETNSID = auto()
				IFLA_CARRIER_UP_COUNT = auto()
				IFLA_CARRIER_DOWN_COUNT = auto()
				IFLA_NEW_IFINDEX = auto()
				IFLA_MIN_MTU = auto()
				IFLA_MAX_MTU = auto()
				IFLA_PROP_LIST = auto()
				IFLA_ALT_IFNAME = auto()
				IFLA_PERM_ADDRESS = auto()
				IFLA_PROTO_DOWN_REASON = auto()


				class IfaddrMsg(Structure):
				_fields_ = [
				("ifa_family", c_ubyte),
				("ifa_prefixlen", c_ubyte),
				("ifa_flags", c_ubyte),
				("ifa_scope", c_ubyte),
				("ifa_index", c_uint),
				]


				class IfattrType(Enum):
				IFA_UNSPEC = 0
				IFA_ADDRESS = auto()
				IFA_LOCAL = auto()
				IFA_LABEL = auto()
				IFA_BROADCAST = auto()
				IFA_ANYCAST = auto()
				IFA_CACHEINFO = auto()
				IFA_MULTICAST = auto()
				IFA_FLAGS = auto()
				IFA_RT_PRIORITY = auto()
				IFA_TARGET_NETNSID = auto()


				class GenlMsgHdr(Structure):
				_fields_ = [
				("cmd", c_ubyte),
				("version", c_ubyte),
				("reserved", c_ushort),
				]


				class NlConst():
				AF_NETLINK = 38
				NETLINK_ROUTE = 0
				NETLINK_GENERIC = 16


				class NlHelper():
				def __init__(self):
				self._pmap = {}
				self._af_cls = self.get_af_cls()

				def get_af_cls(self):
				if sys.platform.startswith("freebsd"):
				cls = AddressFamilyBsd
				else:
				cls = AddressFamilyLinux
				return cls

				def get_propmap(self, cls):
				if cls not in self._pmap:
				ret = {}
				for prop in dir(cls):
				if not prop.startswith("_"):
				ret[getattr(cls, prop).value] = prop
				self._pmap[cls] = ret
				return self._pmap[cls]

				def get_name_propmap(self, cls):
				ret = {}
				for prop in dir(cls):
				if not prop.startswith("_"):
				ret[prop] = getattr(cls, prop).value
				return ret

				def get_attr_byval(self, cls, attr_val):
				propmap = self.get_propmap(cls)
				return propmap.get(attr_val)

				def get_nlmsg_name(self, val):
				for cls in [NlRtMsgType, NlMsgType]:
				v = self.get_attr_byval(cls, val)
				if v is not None:
				return v
				return "msg#{}".format(val)

				def get_af_name(self, family):
				v = self.get_attr_byval(self._af_cls, family)
				if v is not None:
				return v
				return "af#{}".format(family)

				def get_af_value(self, family_str: str) -> int:
				propmap = self.get_name_propmap(self._af_cls)
				return propmap.get(family_str)

				def get_rta_name(self, val):
				return self.get_attr_byval(RtattrType, val)

				def get_bitmask_map(self, cls, val):
				propmap = self.get_propmap(cls)
				v = 1
				ret = {}
				while val:
				if v & val:
				if v in propmap:
				ret[v] = propmap[v]
				else:
				ret[v] = hex(v)
				val -= v
				v *= 2
				return ret

				def get_bitmask_str(self, cls, val):
				bmap = self.get_bitmask_map(cls, val)
				return ",".join([v for k, v in bmap.items()])

				def get_nlm_flags_str(self, msg_str: str, reply: bool, val):
				if reply:
				return self.get_bitmask_str(NlmAckFlags, val)
				if msg_str.startswith("RTM_GET"):
				return self.get_bitmask_str(NlmGetFlags, val)
				elif msg_str.startswith("RTM_DEL"):
				return self.get_bitmask_str(NlmDeleteFlags, val)
				elif msg_str.startswith("RTM_NEW"):
				return self.get_bitmask_str(NlmNewFlags, val)
				else:
				return self.get_bitmask_str(NlmBaseFlags, val)


				class BaseRtAttr(object):
				def __init__(self, parent, rta_type, rta_len, data=None):
				self.parent = parent
				self.helper = parent.helper
				self.attr_enum = parent.attr_enum
				self.rta_type = rta_type & 0x3f
				self.is_nested = rta_type & (1 << 15)
				self.network_byte_order = rta_type & (1 << 14)
				self.rta_len = rta_len
				self.rta_type_str = self.helper.get_attr_byval(self.attr_enum, self.rta_type) # noqa: E501
				if data is not None:
				self._validate(data)
				self._parse(data)
				self._orig_data = data

				def print_attribute(self, prepend=""):
				if self.rta_type_str:
				type_str = self.rta_type_str
				else:
				type_str = "rta#{}".format(self.rta_type)
				print("{}rta_len={} rta_type={}({}){}".format(prepend,
				self.rta_len,
				type_str,
				self.rta_type,
				self._print_attr_value())
				)

				def _print_attr_value(self):
				return " [" + " ".join(["{:02X}".format(b) for b in self._orig_data[4:]]) + "]" # noqa: E501

				@classmethod
				def from_bytes(cls, parent, data):
				if len(data) < sizeof(RtAttr):
				raise ValueError("length less than rtattr header")
				rta_hdr = RtAttr.from_buffer_copy(data)
				self = cls(parent, rta_hdr.rta_type, rta_hdr.rta_len, data[:rta_hdr.rta_len]) # noqa: E501
				# XXX: nested
				return self

				def __bytes__(self):
				ret = self._orig_data
				if align4(len(ret)) != len(ret):
				ret += bytes(align4(len(ret)) - len(ret))
				return ret

				def _validate(self, data):
				pass

				def _parse(self, data):
				pass


				class RtAttrIp(BaseRtAttr):
				def _validate(self, data):
				data_len = len(data) - 4
				if data_len != 4 and data_len != 16:
				raise ValueError("Error validating attr {}: rta_len is not valid".format( # noqa: E501
				self.rta_type_str))

				def _parse(self, data):
				data_len = len(data) - 4
				if data_len == 4:
				self.family = socket.AF_INET
				self.addr = socket.inet_ntop(self.family, data[4:8])
				else:
				self.family = socket.AF_INET6
				self.addr = socket.inet_ntop(self.family, data[4:20])

				def _print_attr_value(self):
				return " addr={}".format(self.addr)


				class RtAttrU32(BaseRtAttr):
				def _validate(self, data):
				if len(data) != 8:
				raise ValueError("Error validating attr {}: rta_len is not valid".format( # noqa: E501
				self.rta_type_str))

				def _parse(self, data):
				self.value = struct.unpack("@I", data[4:8])[0]

				def _print_attr_value(self):
				return " value={}".format(self.value)


				class RtAttrIfindex(RtAttrU32):
				def _print_attr_value(self):
				try:
				ifname = socket.if_indextoname(self.value)
				return " iface={}(#{})".format(ifname, self.value)
				except OSError as e:
				pass
				return " iface=if#{}".format(self.value)


				class RtAttrTable(RtAttrU32):
				def _print_attr_value(self):
				return " rtable={}".format(self.value)


				class RtAttrNhId(RtAttrU32):
				def _print_attr_value(self):
				return " nh_id={}".format(self.value)


				class RtAttrVia(BaseRtAttr):
				def _validate(self, data):
				data_len = len(data) - 4
				if data_len == 0:
				raise ValueError("Error validating attr {}: empty data".format(self.rta_type_str)) # noqa: E501
				family = int(data_len[0])
				if family not in (socket.AF_INET, socket.AF_INET6):
				raise ValueError("Error validating attr {}: unsupported AF {}".format( # noqa: E501
				self.rta_type_str, family))
				if family == socket.AF_INET:
				expected_len = 1 + 4
				else:
				expected_len = 1 + 16
				if data_len != expected_len:
				raise ValueError("Error validating attr {}: expected len {} got {}".format( # noqa: E501
				self.rta_type_str, expected_len, data_len))

				def _parse(self, data):
				data_len = len(data) - 4
				self.family = int(data_len[0])
				if self.family == socket.AF_INET:
				self.addr = socket.inet_ntop(self.family, data[5:9])
				else:
				self.addr = socket.inet_ntop(self.family, data[5:21])

				def _print_attr_value(self):
				return ", via={}".format(self.addr)


				class RtAttrStr(BaseRtAttr):
				def _validate(self, data):
				try:
				s = data[4:].decode("utf-8")
				except Exception as e:
				raise ValueError("wrong utf-8 string")

				def _parse(self, data):
				self.str = data[4:].decode("utf-8")

				def _print_attr_value(self):
				return " str=\"{}\"".format(self.str)


				rta_class_map = {
				"RTA_DST": RtAttrIp,
				"RTA_SRC": RtAttrIp,
				"RTA_IIF": RtAttrIfindex,
				"RTA_OIF": RtAttrIfindex,
				"RTA_GATEWAY": RtAttrIp,
				"RTA_TABLE": RtAttrTable,
				"RTA_VIA": RtAttrVia,
				"RTA_NH_ID": RtAttrNhId,
				}

				err_class_map = {
				"NLMSGERR_ATTR_MSG": RtAttrStr,
				"NLMSGERR_ATTR_OFFS": RtAttrU32,
				}

				ifla_class_map = {
				"IFLA_MTU": RtAttrU32,
				}

				ifa_class_map = {
				"IFA_ADDRESS": RtAttrIp,
				"IFA_LOCAL": RtAttrIp,
				"IFA_LABEL": RtAttrStr,
				"IFA_BROADCAST": RtAttrIp,
				"IFA_ANYCAST": RtAttrIp,
				"IFA_FLAGS": RtAttrU32,
				}


				class BaseNetlinkMessage(object):
				def __init__(self, helper, nlmsg_type):
				self.nlmsg_type = nlmsg_type
				self.ut = unittest.TestCase()
				self.nla_list = []
				self._orig_data = None
				self.helper = helper
				self.nl_hdr = Nlmsghdr(nlmsg_type=nlmsg_type)

				def assertEqual(self, a, b, msg=None):
				self.ut.assertEqual(a, b, msg)

				def assertNotEqual(self, a, b, msg=None):
				self.ut.assertNotEqual(a, b, msg)

				@staticmethod
				def parse_nl_header(data: bytes):
				if len(data) < sizeof(Nlmsghdr):
				raise ValueError("length less than netlink message header")
				return Nlmsghdr.from_buffer_copy(data), sizeof(Nlmsghdr)

				def is_reply(self, hdr):
				return hdr.nlmsg_type == NlMsgType.NLMSG_ERROR.value

				def print_nl_header(self, hdr, prepend=""):
				# len=44, type=RTM_DELROUTE, flags=NLM_F_REQUEST\|NLM_F_ACK, seq=1641163704, pid=0 # noqa: E501
				is_reply = self.is_reply(hdr)
				msg_name = self.helper.get_nlmsg_name(hdr.nlmsg_type)
				print("{}len={}, type={}, flags={}(0x{:X}), seq={}, pid={}".format(
				prepend,
				hdr.nlmsg_len,
				msg_name,
				self.helper.get_nlm_flags_str(msg_name, is_reply, hdr.nlmsg_flags), # noqa: E501
				hdr.nlmsg_flags,
				hdr.nlmsg_seq,
				hdr.nlmsg_pid
				))

				@classmethod
				def from_bytes(cls, helper, data):
				try:
				hdr, hdrlen = BaseNetlinkMessage.parse_nl_header(data)
				self = cls(helper, hdr.nlmsg_type)
				self._orig_data = data
				self.nl_hdr = hdr
				except ValueError as e:
				print("Failed to parse nl header: {}".format(e))
				cls.print_as_bytes(data)
				raise
				return self

				def print_message(self):
				self.print_nl_header(self.nl_hdr)

				@staticmethod
				def print_as_bytes(data: bytes, descr: str):
				print("===vv {} (len:{:3d}) vv===".format(descr, len(data)))
				off = 0
				step = 16
				while off < len(data):
				for i in range(step):
				if off + i < len(data):
				print(" {:02X}".format(data[off + i]), end="")
				print("")
				off += step
				print("--------------------")


				class StdNetlinkMessage(BaseNetlinkMessage):
				@classmethod
				def from_bytes(cls, helper, data):
				try:
				hdr, hdrlen = BaseNetlinkMessage.parse_nl_header(data)
				self = cls(helper, hdr.nlmsg_type)
				self._orig_data = data
				self.nl_hdr = hdr
				except ValueError as e:
				print("Failed to parse nl header: {}".format(e))
				cls.print_as_bytes(data)
				raise

				offset = align4(hdrlen)
				try:
				base_hdr, hdrlen = self.parse_base_header(data[offset:])
				self.base_hdr = base_hdr
				offset += align4(hdrlen)
				## XXX: CAP_ACK
				Lint: PEP8 E266 Inline Actions too many leading '#' for block comment Lint: PEP8 E266: too many leading '#' for block comment
				except ValueError as e:
				print("Failed to parse nl rt header: {}".format(e))
				cls.print_as_bytes(data)
				raise

				orig_offset = offset
				try:
				nla_list, nla_len = self.parse_nla_list(data[offset:])
				offset += nla_len
				if offset != len(data):
				raise ValueError("{} bytes left at the end of the packet".format(len(data) - offset)) # noqa: E501
				self.nla_list = nla_list
				except ValueError as e:
				print("Failed to parse nla attributes at offset {}: {}".format(orig_offset, e)) # noqa: E501
				cls.print_as_bytes(data, "msg dump")
				cls.print_as_bytes(data[orig_offset:], "failed block")
				raise
				return self

				def parse_nla_list(self, data: bytes) -> List[BaseRtAttr]:
				ret = []
				offset = 0
				while offset < len(data):
				# print("OFFSET={}".format(offset))
				if offset + 4 > len(data):
				raise ValueError("only {} bytes remaining".format(len(data) - offset)) # noqa: E501
				rta_hdr = RtAttr.from_buffer_copy(data[offset:])
				rta_type_str = self.helper.get_attr_byval(self.attr_enum, rta_hdr.rta_type) # noqa: E501
				cls = self.attr_class_map.get(rta_type_str, BaseRtAttr)
				rta = cls.from_bytes(self, data[offset:])
				offset += align4(rta.rta_len)
				if rta.rta_len == 0:
				raise ValueError("empty rta len, {} bytes remaining".format(len(data) - offset)) # noqa: E501
				ret.append(rta)
				return ret, offset

				def print_message(self):
				self.print_nl_header(self.nl_hdr)
				self.print_base_header(self.base_hdr, " ")
				for nla in self.nla_list:
				nla.print_attribute(" ")


				class NetlinkErrorMessage(StdNetlinkMessage):
				messages = [NlMsgType.NLMSG_ERROR.value]
				attr_class_map = err_class_map
				attr_enum = NlErrattrType

				def __init__(self, helper, nlmsg_type):
				super().__init__(helper, nlmsg_type)
				self.err_hdr = Nlmsgerr()

				def parse_base_header(self, data):
				if len(data) < sizeof(Nlmsgerr):
				raise ValueError("length less than nlmsgerr header")
				err_hdr = Nlmsgerr.from_buffer_copy(data)
				sz = sizeof(Nlmsgerr)
				if (self.nl_hdr.nlmsg_flags & 0x100) == 0:
				sz += align4(err_hdr.msg.nlmsg_len - sizeof(Nlmsghdr))
				return (err_hdr, sz)

				def print_base_header(self, errhdr, prepend=""):
				print("{}error={}, ".format(prepend, errhdr.error), end="")
				self.print_nl_header(errhdr.msg, prepend)


				class BaseNetlinkRtMessage(StdNetlinkMessage):
				attr_class_map = {}
				attr_enum = None

				def __init__(self, helper, nlm_type):
				super().__init__(helper, nlm_type)
				self.base_hdr = None

				def __bytes__(self):
				ret = bytes()
				for nla in self.nla_list:
				ret += bytes(nla)
				ret = bytes(self.base_hdr) + ret
				self.nl_hdr.nlmsg_len = len(ret) + sizeof(Nlmsghdr)
				return bytes(self.nl_hdr) + ret

				def print_message(self):
				self.print_nl_header(self.nl_hdr)
				self.print_base_header(self.base_hdr, " ")
				for nla in self.nla_list:
				nla.print_attribute(" ")


				class NetlinkRtMessage(BaseNetlinkRtMessage):
				messages = [
				NlRtMsgType.RTM_NEWROUTE.value,
				NlRtMsgType.RTM_DELROUTE.value,
				NlRtMsgType.RTM_GETROUTE.value,
				]
				attr_class_map = rta_class_map
				attr_enum = RtattrType

				def __init__(self, helper, nlm_type):
				super().__init__(helper, nlm_type)
				self.base_hdr = RtMsgHdr()

				def parse_base_header(self, data):
				if len(data) < sizeof(RtMsgHdr):
				raise ValueError("length less than rtmsg header")
				rtm_hdr = RtMsgHdr.from_buffer_copy(data)
				return (rtm_hdr, sizeof(RtMsgHdr))

				def print_base_header(self, hdr, prepend=""):
				family = self.helper.get_af_name(hdr.rtm_family)
				print("{}family={}, dst_len={}, src_len={}, tos={}, table={}, protocol={}({}), scope={}({}), type={}({}), flags={}({})".format( # noqa: E501
				prepend,
				family,
				hdr.rtm_dst_len,
				hdr.rtm_src_len,
				hdr.rtm_tos,
				hdr.rtm_table,
				self.helper.get_attr_byval(RtProto, hdr.rtm_protocol),
				hdr.rtm_protocol,
				self.helper.get_attr_byval(RtScope, hdr.rtm_scope),
				hdr.rtm_scope,
				self.helper.get_attr_byval(RtType, hdr.rtm_type),
				hdr.rtm_type,
				self.helper.get_bitmask_str(RtMsgFlags, hdr.rtm_flags),
				hdr.rtm_flags))


				class NetlinkIflaMessage(BaseNetlinkRtMessage):
				messages = [
				NlRtMsgType.RTM_NEWLINK.value,
				NlRtMsgType.RTM_DELLINK.value,
				NlRtMsgType.RTM_GETLINK.value,
				]
				attr_class_map = ifla_class_map
				attr_enum = IflattrType

				def __init__(self, helper, nlm_type):
				super().__init__(helper, nlm_type)
				self.base_hdr = IfinfoMsg()

				def parse_base_header(self, data):
				if len(data) < sizeof(IfinfoMsg):
				raise ValueError("length less than IfinfoMsg header")
				rtm_hdr = IfinfoMsg.from_buffer_copy(data)
				return (rtm_hdr, sizeof(IfinfoMsg))

				def print_base_header(self, hdr, prepend=""):
				family = self.helper.get_af_name(hdr.ifi_family)
				print("{}family={}, ifi_type={}, ifi_index={}, ifi_flags={}, ifi_change={}".format( # noqa: E501
				prepend,
				family,
				hdr.ifi_type,
				hdr.ifi_index,
				hdr.ifi_flags,
				hdr.ifi_change))


				class NetlinkIfaMessage(BaseNetlinkRtMessage):
				messages = [
				NlRtMsgType.RTM_NEWADDR.value,
				NlRtMsgType.RTM_DELADDR.value,
				NlRtMsgType.RTM_GETADDR.value,
				]
				attr_class_map = ifa_class_map
				attr_enum = IfattrType

				def __init__(self, helper, nlm_type):
				super().__init__(helper, nlm_type)
				self.base_hdr = IfaddrMsg()

				def parse_base_header(self, data):
				if len(data) < sizeof(IfaddrMsg):
				raise ValueError("length less than IfaddrMsg header")
				rtm_hdr = IfaddrMsg.from_buffer_copy(data)
				return (rtm_hdr, sizeof(IfaddrMsg))

				def print_base_header(self, hdr, prepend=""):
				family = self.helper.get_af_name(hdr.ifa_family)
				print("{}family={}, ifa_prefixlen={}, ifa_flags={}, ifa_scope={}, ifa_index={}".format( # noqa: E501
				prepend,
				family,
				hdr.ifa_prefixlen,
				hdr.ifa_flags,
				hdr.ifa_scope,
				hdr.ifa_index))


				class Nlsock():
				def __init__(self, family, helper):
				self.helper = helper
				self.sock_fd = self._setup_netlink(family)
				self._data = bytes()
				self.rtm_seq = 1
				self.pid = os.getpid()
				self.msgmap = self.build_msgmap()
				self.set_groups(NlRtGroup.RTNLGRP_IPV4_ROUTE.value \| NlRtGroup.RTNLGRP_IPV6_ROUTE.value) # noqa: E501

				def build_msgmap(self):
				classes = [NetlinkRtMessage, NetlinkIfaMessage, NetlinkErrorMessage]
				xmap = {}
				for cls in classes:
				for message in cls.messages:
				xmap[message] = cls
				return xmap

				def get_seq(self):
				ret = self.rtm_seq
				self.rtm_seq += 1
				return ret

				def _setup_netlink(self, netlink_family) -> int:
				family = self.helper.get_af_value("AF_NETLINK")
				s = socket.socket(family, socket.SOCK_RAW, netlink_family)
				s.setsockopt(270, 10, 1) # NETLINK_CAP_ACK
				Lint: PEP8 E261 Inline Actions at least two spaces before inline comment Lint: PEP8 E261: at least two spaces before inline comment
				s.setsockopt(270, 11, 1) # NETLINK_EXT_ACK
				Lint: PEP8 E261 Inline Actions at least two spaces before inline comment Lint: PEP8 E261: at least two spaces before inline comment
				return s

				def set_groups(self, mask: int):
				self.sock_fd.setsockopt(socket.SOL_SOCKET, 1, mask)
				# snl = SockaddrNl(nl_len = sizeof(SockaddrNl), nl_family=38,
				# nl_pid=self.pid, nl_groups=mask)
				# xbuffer = create_string_buffer(sizeof(SockaddrNl))
				# memmove(xbuffer, addressof(snl), sizeof(SockaddrNl))
				# k = struct.pack("@BBHII", 12, 38, 0, self.pid, mask)
				# self.sock_fd.bind(k)

				def write_message(self, msg):
				print("vvvvvvvv OUT vvvvvvvv")
				msg.print_message()
				msg_bytes = bytes(msg)
				try:
				ret = os.write(self.sock_fd.fileno(), bytes(msg))
				except Exception as e:
				print("write({}) -> {}".format(len(msg_bytes), e))

				def parse_message(self, data: bytes):
				if len(data) < sizeof(Nlmsghdr):
				raise Exception("Short read from nl: {} bytes".format(len(data)))
				hdr = Nlmsghdr.from_buffer_copy(data)
				nlmsg_type = hdr.nlmsg_type
				cls = self.msgmap.get(nlmsg_type)
				if not cls:
				cls = BaseNetlinkMessage
				return cls.from_bytes(self.helper, data)

				def write_data(self, data: bytes):
				self.sock_fd.send(data)

				def read_data(self):
				while True:
				data = self.sock_fd.recv(65535)
				self._data += data
				if len(self._data) >= sizeof(Nlmsghdr):
				break
				if seq is None:
				break
				hdr = Nlmsghdr.from_buffer_copy(data)
				if hdr.nlmsg_pid == self.pid and hdr.nlmsg_seq == seq:
				break
				return data

				def read_message(self) -> bytes:
				if len(self._data) < sizeof(Nlmsghdr):
				self.read_data()
				hdr = Nlmsghdr.from_buffer_copy(self._data)
				while (hdr.nlmsg_len > len(self._data)):
				self.read_data()
				raw_msg = self._data[:hdr.nlmsg_len]
				self._data = self._data[hdr.nlmsg_len:]
				return self.parse_message(raw_msg)

				def fill_msg_seq(self, msg):
				msg.nl_hdr.nlmsg_seq = self.get_seq()
				msg.nl_hdr.nlmsg_pid = self.pid

				def request_ifaces(self):
				msg = NetlinkIfaMessage(self.helper, NlRtMsgType.RTM_GETLINK.value)
				flags = NlmGetFlags.NLM_F_ROOT.value \| NlmGetFlags.NLM_F_MATCH.value
				self.fill_msg_seq(msg)
				msg.nl_hdr.nlmsg_flags = flags \| NlmBaseFlags.NLM_F_REQUEST.value

				msg_bytes = bytes(msg)
				x = self.parse_message(msg_bytes)
				x.print_message()
				print(msg_bytes)
				# Skip family for now
				self.write_data(msg_bytes)

				def request_ifaddrs(self, family):
				msg = NetlinkIfaMessage(self.helper, NlRtMsgType.RTM_GETADDR.value)
				flags = NlmGetFlags.NLM_F_ROOT.value \| NlmGetFlags.NLM_F_MATCH.value
				self.fill_msg_seq(msg)
				msg.base_hdr.ifa_family = family
				msg.nl_hdr.nlmsg_flags = flags \| NlmBaseFlags.NLM_F_REQUEST.value

				msg_bytes = bytes(msg)
				x = self.parse_message(msg_bytes)
				x.print_message()
				print(msg_bytes)
				# Skip family for now
				self.write_data(msg_bytes)

				def request_routes(self, family):
				msg = NetlinkRtMessage(self.helper, NlRtMsgType.RTM_GETROUTE.value)
				flags = NlmGetFlags.NLM_F_ROOT.value \| NlmGetFlags.NLM_F_MATCH.value
				self.fill_msg_seq(msg)
				msg.base_hdr.rtm_family = family
				msg.nl_hdr.nlmsg_flags = flags \| NlmBaseFlags.NLM_F_REQUEST.value

				msg_bytes = bytes(msg)
				x = self.parse_message(msg_bytes)
				x.print_message()
				print(msg_bytes)
				# Skip family for now
				self.write_data(msg_bytes)

				def request_raw(self):
				flags = NlmGetFlags.NLM_F_ROOT.value \| NlmGetFlags.NLM_F_MATCH.value
				hdr = Nlmsghdr(
				nlmsg_type = NlRtMsgType.RTM_GETROUTE.value,
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				nlmsg_flags = flags \| NlmBaseFlags.NLM_F_REQUEST.value,
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				nlmsg_len = sizeof(Nlmsghdr) + sizeof(RtMsgHdr) + 4,
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				)
				rthdr = RtMsgHdr()

				rta = RtAttr(rta_len=3, rta_type=RtattrType.RTA_OIF.value)

				msg_bytes = bytes(hdr) + bytes(rthdr) + bytes(rta)
				# x = self.parse_message(msg_bytes)
				# x.print_message()
				print(msg_bytes)
				self.write_data(msg_bytes)

				def request_families(self):
				hdr = Nlmsghdr(
				nlmsg_type = 16,
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				nlmsg_flags = NlmBaseFlags.NLM_F_REQUEST.value,
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				nlmsg_len = sizeof(Nlmsghdr) + sizeof(GenlMsgHdr) + 4,
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				Lint: PEP8 E251 Inline Actions unexpected spaces around keyword / parameter equals Lint: PEP8 E251: unexpected spaces around keyword / parameter equals
				)
				ghdr = GenlMsgHdr(cmd=3)

				rta = RtAttr(rta_len=3, rta_type=RtattrType.RTA_OIF)

				msg_bytes = bytes(hdr) + bytes(ghdr) + bytes(rta)
				x = self.parse_message(msg_bytes)
				x.print_message()
				print(msg_bytes)
				self.write_data(msg_bytes)


				def main():
				helper = NlHelper()
				if False:
				nl = Nlsock(NlConst.NETLINK_GENERIC, helper)
				nl.request_families()
				else:
				nl = Nlsock(NlConst.NETLINK_ROUTE, helper)
				# nl.request_ifaddrs(socket.AF_INET)
				# nl.request_raw()
				nl.request_routes(0)
				# nl.request_ifaces()
				while True:
				msg = nl.read_message()
				print("")
				msg.print_message()
				msg.print_as_bytes(msg._orig_data, "-- DATA --")

				pass


				if __name__ == "__main__":
				main()