build.main.Main.handle_features_reply() - Code Metrics - kytos/of_core - Measure and Improve Code Quality continuously with Scrutinizer

build.main.Main.handle_features_reply() A
last analyzed 2021-05-26 15:17 UTC

↳ Parent: build.main

Complexity

Conditions

Size

Total Lines	26
Code Lines	18

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	13
CRAP Score	4

Importance

Changes

Metric	Value
cc	4
eloc	18
nop	2
dl	0
loc	26
ccs	13
cts	13
cp	1
crap	4
rs	9.5
c	0
b	0
f	0

"""NApp responsible for the main OpenFlow basic operations."""

from pyof.foundation.exceptions import UnpackException
from pyof.foundation.network_types import Ethernet, EtherType
from pyof.utils import PYOF_VERSION_LIBS, unpack
from pyof.v0x01.common.header import Type
from pyof.v0x01.controller2switch.common import StatsType
from pyof.v0x04.controller2switch.common import MultipartType

from kytos.core import KytosEvent, KytosNApp, log
from kytos.core.connection import ConnectionState
from kytos.core.helpers import listen_to
from kytos.core.interface import Interface
from napps.kytos.of_core import settings
from napps.kytos.of_core.utils import (GenericHello, NegotiationException,
                                       emit_message_in, emit_message_out,
                                       of_slicer)
from napps.kytos.of_core.v0x01 import utils as of_core_v0x01_utils
from napps.kytos.of_core.v0x01.flow import Flow as Flow01
from napps.kytos.of_core.v0x04 import utils as of_core_v0x04_utils
from napps.kytos.of_core.v0x04.flow import Flow as Flow04


class Main(KytosNApp):
    """Main class of the NApp responsible for OpenFlow basic operations."""

    # Keep track of multiple multipart replies from our own request only.
    # Assume that all replies are received before setting a new xid.
    _multipart_replies_xids = {}
    _multipart_replies_flows = {}
    _multipart_replies_ports = {}

    def setup(self):
        """App initialization (used instead of ``__init__``).

        The setup method is automatically called by the run method.
        Users shouldn't call this method directly.
        """
        self.of_core_version_utils = {0x01: of_core_v0x01_utils,
                                      0x04: of_core_v0x04_utils}
        self.execute_as_loop(settings.STATS_INTERVAL)

    def execute(self):
        """Run once on app 'start' or in a loop.

        The execute method is called by the run method of KytosNApp class.
        Users shouldn't call this method directly.
        """
        for switch in self.controller.switches.values():
            if switch.is_connected():
                self._request_flow_list(switch)
                if settings.SEND_ECHO_REQUESTS:
                    version_utils = \
                        self.of_core_version_utils[switch.
                                                   connection.protocol.version]
                    version_utils.send_echo(self.controller, switch)

    def _request_flow_list(self, switch):
        """Send flow stats request to a connected switch."""
        of_version = switch.connection.protocol.version
        if of_version == 0x01:
            of_core_v0x01_utils.update_flow_list(self.controller, switch)
            of_core_v0x01_utils.request_port_stats(self.controller, switch)
        elif of_version == 0x04:
            xid_flows = of_core_v0x04_utils.update_flow_list(self.controller,
                                                             switch)
            xid_ports = of_core_v0x04_utils.request_port_stats(self.controller,
                                                               switch)
            self._multipart_replies_xids[switch.id] = {'flows': xid_flows,
                                                       'ports': xid_ports}

    @listen_to('kytos/of_core.v0x01.messages.in.ofpt_stats_reply')
    def handle_stats_reply(self, event):
        """Handle stats replies for v0x01 switches.

        Args:
            event (:class:`~kytos.core.events.KytosEvent):
                Event with ofpt_stats_reply in message.
        """
        switch = event.source.switch
        msg = event.content['message']
        if msg.body_type == StatsType.OFPST_FLOW:
            switch.flows = [Flow01.from_of_flow_stats(f, switch)
                            for f in msg.body]
            event_raw = KytosEvent(
                name='kytos/of_core.flow_stats.received',
                content={'switch': switch})
            self.controller.buffers.app.put(event_raw)
        elif msg.body_type == StatsType.OFPST_PORT:
            port_stats = [of_port_stats for of_port_stats in msg.body]
            port_stats_event = KytosEvent(
                name=f"kytos/of_core.port_stats",
                content={
                    'switch': switch,
                    'port_stats': port_stats
                    })
            self.controller.buffers.app.put(port_stats_event)
        elif msg.body_type == StatsType.OFPST_DESC:
            switch.update_description(msg.body)

    @listen_to('kytos/of_core.v0x0[14].messages.in.ofpt_features_reply')
    def handle_features_reply(self, event):
        """Handle kytos/of_core.messages.in.ofpt_features_reply event.

        This is the end of the Handshake workflow of the OpenFlow Protocol.

        Args:
            event (KytosEvent): Event with features reply message.
        """
        connection = event.source
        version_utils = self.of_core_version_utils[connection.protocol.version]
        switch = version_utils.handle_features_reply(self.controller, event)

        if (connection.is_during_setup() and
                connection.protocol.state == 'waiting_features_reply'):
            connection.protocol.state = 'handshake_complete'
            connection.set_established_state()
            version_utils.send_desc_request(self.controller, switch)
            if settings.SEND_SET_CONFIG:
                version_utils.send_set_config(self.controller, switch)
            log.info('Connection %s, Switch %s: OPENFLOW HANDSHAKE COMPLETE',
                     connection.id, switch.dpid)
            event_raw = KytosEvent(
                name='kytos/of_core.handshake.completed',
                content={'switch': switch})
            self.controller.buffers.app.put(event_raw)

    @listen_to('kytos/of_core.handshake.completed')
    def on_handshake_completed_request_flow_list(self, event):
        """Request an flow list right after the handshake is completed.

        Args:
            event (KytosEvent): Event with the switch' handshake completed
        """
        switch = event.content['switch']
        if switch.is_enabled():
            self._request_flow_list(switch)

    @listen_to('kytos/of_core.v0x04.messages.in.ofpt_multipart_reply')
    def handle_multipart_reply(self, event):
        """Handle multipart replies for v0x04 switches.

        Args:
            event (:class:`~kytos.core.events.KytosEvent):
                Event with ofpt_multipart_reply in message.
        """
        reply = event.content['message']
        switch = event.source.switch

        if reply.multipart_type == MultipartType.OFPMP_FLOW:
            self._handle_multipart_flow_stats(reply, switch)
        elif reply.multipart_type == MultipartType.OFPMP_PORT_STATS:
            self._handle_multipart_port_stats(reply, switch)
        elif reply.multipart_type == MultipartType.OFPMP_PORT_DESC:
            of_core_v0x04_utils.handle_port_desc(self.controller, switch,
                                                 reply.body)
        elif reply.multipart_type == MultipartType.OFPMP_DESC:
            switch.update_description(reply.body)

    def _handle_multipart_flow_stats(self, reply, switch):
        """Update switch flows after all replies are received."""
        if self._is_multipart_reply_ours(reply, switch, 'flows'):
            # Get all flows from the reply
            flows = [Flow04.from_of_flow_stats(of_flow_stats, switch)
                     for of_flow_stats in reply.body]
            # Get existent flows from the same xid (or create an empty list)
            all_flows = self._multipart_replies_flows.setdefault(switch.id, [])
            all_flows.extend(flows)
            if reply.flags.value % 2 == 0:  # Last bit means more replies
                self._update_switch_flows(switch)
                event_raw = KytosEvent(
                    name='kytos/of_core.flow_stats.received',
                    content={'switch': switch})
                self.controller.buffers.app.put(event_raw)

    def _handle_multipart_port_stats(self, reply, switch):
        """Emit an event about new port stats."""
        if self._is_multipart_reply_ours(reply, switch, 'ports'):
            port_stats = [of_port_stats for of_port_stats in reply.body]
            all_port_stats = self._multipart_replies_ports.setdefault(
                switch.id, []
            )
            all_port_stats.extend(port_stats)
            if reply.flags.value % 2 == 0:
                self._new_port_stats(switch)

    def _update_switch_flows(self, switch):
        """Update controllers' switch flow list and clean resources."""
        switch.flows = self._multipart_replies_flows[switch.id]
        del self._multipart_replies_flows[switch.id]
        del self._multipart_replies_xids[switch.id]['flows']

    def _new_port_stats(self, switch):
        """Send an event with the new port stats and clean resources."""
        all_port_stats = self._multipart_replies_ports[switch.id]
        del self._multipart_replies_ports[switch.id]
        del self._multipart_replies_xids[switch.id]['ports']
        port_stats_event = KytosEvent(
            name=f"kytos/of_core.port_stats",
            content={
                'switch': switch,
                'port_stats': all_port_stats
                })
        self.controller.buffers.app.put(port_stats_event)

    def _is_multipart_reply_ours(self, reply, switch, stat):
        """Return whether we are expecting the reply."""
        if switch.id in self._multipart_replies_xids:
            sent_xid = self._multipart_replies_xids[switch.id].get(stat)
            if sent_xid == reply.header.xid:
                return True
        return False

    @listen_to('kytos/core.openflow.raw.in')
    def handle_raw_in(self, event):
        """Handle a RawEvent and generate a kytos/core.messages.in.* event.

        Args:
            event (KytosEvent): RawEvent with openflow message to be unpacked
        """
        # If the switch is already known to the controller, update the
        # 'lastseen' attribute
        switch = event.source.switch
        if switch:
            switch.update_lastseen()

        connection = event.source

        data = connection.remaining_data + event.content['new_data']
        packets, connection.remaining_data = of_slicer(data)
        if not packets:
            return

        unprocessed_packets = []

        for packet in packets:
            if not connection.is_alive():
                return

            if connection.is_new():
                try:
                    message = GenericHello(packet=packet)
                    self._negotiate(connection, message)
                except (UnpackException, NegotiationException) as err:
                    if isinstance(err, UnpackException):
                        log.error('Connection %s: Invalid hello message',
                                  connection.id)
                    else:
                        log.error('Connection %s: Negotiation Failed',
                                  connection.id)
                    connection.protocol.state = 'hello_failed'
                    connection.close()
                    connection.state = ConnectionState.FAILED
                    return
                connection.set_setup_state()
                continue

            try:
                message = connection.protocol.unpack(packet)
                if message.header.message_type == Type.OFPT_ERROR:
                    log.error("OFPT_ERROR: %s error code received from"
                              " switch %s with xid %s", message.code,
                              switch.dpid, message.header.xid)
            except (UnpackException, AttributeError) as err:
                log.error(err)
                if isinstance(err, AttributeError):
                    error_msg = 'connection closed before version negotiation'
                    log.error('Connection %s: %s', connection.id, error_msg)
                connection.close()
                return

            log.debug('Connection %s: IN OFP, version: %s, type: %s, xid: %s',
                      connection.id,
                      message.header.version,
                      message.header.message_type,
                      message.header.xid)

            waiting_features_reply = (
                str(message.header.message_type) == 'Type.OFPT_FEATURES_REPLY'
                and connection.protocol.state == 'waiting_features_reply')

            if connection.is_during_setup() and not waiting_features_reply:
                unprocessed_packets.append(packet)
                continue

            self.emit_message_in(connection, message)

        connection.remaining_data = b''.join(unprocessed_packets) + \
                                    connection.remaining_data

    def emit_message_in(self, connection, message):
        """Emit a KytosEvent for each incoming message.

        Also update links and port status.
        """
        if not connection.is_alive():
            return
        emit_message_in(self.controller, connection, message)
        msg_type = message.header.message_type.name.lower()
        if msg_type == 'ofpt_port_status':
            self.update_port_status(message, connection)
        elif msg_type == 'ofpt_packet_in':
            self.update_links(message, connection)

    def emit_message_out(self, connection, message):
        """Emit a KytosEvent for each outgoing message."""
        if connection.is_alive():
            emit_message_out(self.controller, connection, message)

    @listen_to('kytos/of_core.v0x0[14].messages.in.ofpt_echo_request')
    def handle_echo_request(self, event):
        """Handle Echo Request Messages.

        This method will get a echo request sent by client and generate a
        echo reply as answer.

        Args:
            event (:class:`~kytos.core.events.KytosEvent`):
                Event with echo request in message.

        """
        pyof_lib = PYOF_VERSION_LIBS[event.source.protocol.version]
        echo_request = event.message
        echo_reply = pyof_lib.symmetric.echo_reply.EchoReply(
            xid=echo_request.header.xid,
            data=echo_request.data)
        self.emit_message_out(event.source, echo_reply)

    def _negotiate(self, connection, message):
        """Handle hello messages.

        This method will handle the incoming hello message by client
        and deal with negotiation.

        Parameters:
            event (KytosMessageInHello): KytosMessageInHelloEvent

        """
        if message.versions:
            version = _get_version_from_bitmask(message.versions)
        else:
            version = _get_version_from_header(message.header.version)

        log.debug('connection %s: negotiated version - %s',
                  connection.id, str(version))

        if version is None:
            self.fail_negotiation(connection, message)
            raise NegotiationException()

        version_utils = self.of_core_version_utils[version]
        version_utils.say_hello(self.controller, connection)

        connection.protocol.name = 'openflow'
        connection.protocol.version = version
        connection.protocol.unpack = unpack
        connection.protocol.state = 'sending_features'
        self.send_features_request(connection)
        log.debug('Connection %s: Hello complete', connection.id)

    def fail_negotiation(self, connection, hello_message):
        """Send Error message and emit event upon negotiation failure."""
        log.warning('connection %s: version negotiation failed',
                    connection.id)
        connection.protocol.state = 'hello_failed'
        event_raw = KytosEvent(
            name='kytos/of_core.hello_failed',
            content={'source': connection})
        self.controller.buffers.app.put(event_raw)

        version = max(settings.OPENFLOW_VERSIONS)
        pyof_lib = PYOF_VERSION_LIBS[version]

        error_message = pyof_lib.asynchronous.error_msg.ErrorMsg(
            xid=hello_message.header.xid,
            error_type=pyof_lib.asynchronous.error_msg.
            ErrorType.OFPET_HELLO_FAILED,
            code=pyof_lib.asynchronous.error_msg.HelloFailedCode.
            OFPHFC_INCOMPATIBLE)
        self.emit_message_out(connection, error_message)

    # May be removed
    @listen_to('kytos/of_core.v0x0[14].messages.out.ofpt_echo_reply')
    def handle_queued_openflow_echo_reply(self, event):
        """Handle queued OpenFlow echo reply messages.

        Send a feature request message if SEND_FEATURES_REQUEST_ON_ECHO
        is True (default is False).
        """
        if settings.SEND_FEATURES_REQUEST_ON_ECHO:
            self.send_features_request(event.destination)

    def send_features_request(self, destination):
        """Send a feature request to the switch."""
        version = destination.protocol.version
        pyof_lib = PYOF_VERSION_LIBS[version]
        features_request = pyof_lib.controller2switch.\
            features_request.FeaturesRequest()
        self.emit_message_out(destination, features_request)

    # pylint: disable=no-self-use
    @listen_to('kytos/of_core.v0x0[14].messages.out.ofpt_features_request')
    def handle_features_request_sent(self, event):
        """Ensure request has actually been sent before changing state."""
        if event.destination.protocol.state == 'sending_features':
            event.destination.protocol.state = 'waiting_features_reply'
    # pylint: enable=no-self-use

    @staticmethod
    @listen_to('kytos/of_core.v0x[0-9a-f]{2}.messages.in.hello_failed',
               'kytos/of_core.v0x0[14].messages.out.hello_failed')
    def handle_openflow_in_hello_failed(event):
        """Close the connection upon hello failure."""
        event.destination.close()
        log.debug("Connection %s: Connection closed.", event.destination.id)

    def shutdown(self):
        """End of the application."""
        log.debug('Shutting down...')

    def update_links(self, message, source):
        """Dispatch 'reacheable.mac' event.

        Args:
            message: python openflow (pyof) PacketIn object.
            source: kytos.core.switch.Connection instance.

        Dispatch:
            `reachable.mac`:
                {
                  switch : <switch.id>,
                  port: <port.port_no>
                  reachable_mac: <mac_address>
                }

        """
        ethernet = Ethernet()
        ethernet.unpack(message.data.value)
        if ethernet.ether_type in (EtherType.LLDP, EtherType.IPV6):
            return

        try:
            port = source.switch.get_interface_by_port_no(
                message.in_port.value)
        except AttributeError:
            port = source.switch.get_interface_by_port_no(message.in_port)

        name = 'kytos/of_core.reachable.mac'
        content = {'switch': source.switch,
                   'port': port,
                   'reachable_mac': ethernet.source.value}
        event = KytosEvent(name, content)
        self.controller.buffers.app.put(event)

        msg = 'The MAC %s is reachable from switch/port %s/%s.'
        log.debug(msg, ethernet.source, source.switch.id,
                  message.in_port)

    def _send_specific_port_mod(self, port, interface, current_state):
        """Dispatch port link_up/link_down events."""
        event_name = 'kytos/of_core.switch.interface.'
        event_content = {'interface': interface}

        if port.state.value % 2:
            status = 'link_down'
        else:
            status = 'link_up'

        if current_state:
            if current_state % 2:
                current_status = 'link_down'
            else:
                current_status = 'link_up'
        else:
            current_status = None

        if status != current_status:
            event = KytosEvent(name=event_name+status, content=event_content)
            self.controller.buffers.app.put(event)

    def update_port_status(self, port_status, source):
        """Dispatch 'port.*' events.

        Current events:

        created|deleted|link_up|link_down|modified

        Args:
            port_status: python openflow (pyof) PortStatus object.
            source: kytos.core.switch.Connection instance.

        Dispatch:
            `kytos/of_core.switch.port.[created|modified|deleted]`:
                {
                  switch : <switch.id>,
                  port: <port.port_no>
                  port_description: {<description of the port>}
                }

        """
        reason = port_status.reason.enum_ref(port_status.reason.value).name
        port = port_status.desc
        port_no = port.port_no.value
        event_name = 'kytos/of_core.switch.interface.'

        if reason == 'OFPPR_ADD':
            status = 'created'
            interface = Interface(name=port.name.value,
                                  address=port.hw_addr.value,
                                  port_number=port_no,
                                  switch=source.switch,
                                  state=port.state.value,
                                  features=port.curr)
            source.switch.update_interface(interface)

        elif reason == 'OFPPR_MODIFY':
            status = 'modified'
            interface = source.switch.get_interface_by_port_no(port_no)
            current_status = None
            if interface:
                log.info('Modified %s %s:%s' %
                         (interface, interface.switch.dpid,
                          interface.port_number))
                current_status = interface.state
                interface.state = port.state.value
                interface.name = port.name.value
                interface.address = port.hw_addr.value
                interface.features = port.curr
            else:
                interface = Interface(name=port.name.value,
                                      address=port.hw_addr.value,
                                      port_number=port_no,
                                      switch=source.switch,
                                      state=port.state.value,
                                      features=port.curr)
            source.switch.update_interface(interface)
            self._send_specific_port_mod(port, interface, current_status)

        elif reason == 'OFPPR_DELETE':
            status = 'deleted'
            interface = source.switch.get_interface_by_port_no(port_no)
            source.switch.remove_interface(interface)

        event_name += status

        content = {'interface': interface}


        event = KytosEvent(name=event_name, content=content)
        self.controller.buffers.app.put(event)

        msg = 'The port %s from switch %s was %s.'
        log.debug(msg, port_status.desc.port_no, source.switch.id, status)


def _get_version_from_bitmask(message_versions):
    """Get common version from hello message version bitmap."""
    try:
        return max([version for version in message_versions
                    if version in settings.OPENFLOW_VERSIONS])
    except ValueError:
        return None


def _get_version_from_header(message_version):
    """Get common version from hello message header version."""
    version = min(message_version, max(settings.OPENFLOW_VERSIONS))
    return version if version in settings.OPENFLOW_VERSIONS else None


1		"""NApp responsible for the main OpenFlow basic operations."""
2
3	1	from pyof.foundation.exceptions import UnpackException
4	1	from pyof.foundation.network_types import Ethernet, EtherType
5	1	from pyof.utils import PYOF_VERSION_LIBS, unpack
6	1	from pyof.v0x01.common.header import Type
7	1	from pyof.v0x01.controller2switch.common import StatsType
8	1	from pyof.v0x04.controller2switch.common import MultipartType
9
10	1	from kytos.core import KytosEvent, KytosNApp, log
11	1	from kytos.core.connection import ConnectionState
12	1	from kytos.core.helpers import listen_to
13	1	from kytos.core.interface import Interface
14	1	from napps.kytos.of_core import settings
15	1	from napps.kytos.of_core.utils import (GenericHello, NegotiationException,
16		emit_message_in, emit_message_out,
17		of_slicer)
18	1	from napps.kytos.of_core.v0x01 import utils as of_core_v0x01_utils
19	1	from napps.kytos.of_core.v0x01.flow import Flow as Flow01
20	1	from napps.kytos.of_core.v0x04 import utils as of_core_v0x04_utils
21	1	from napps.kytos.of_core.v0x04.flow import Flow as Flow04
22
23
24	1	class Main(KytosNApp):
25		"""Main class of the NApp responsible for OpenFlow basic operations."""
26
27		# Keep track of multiple multipart replies from our own request only.
28		# Assume that all replies are received before setting a new xid.
29	1	_multipart_replies_xids = {}
30	1	_multipart_replies_flows = {}
31	1	_multipart_replies_ports = {}
32
33	1	def setup(self):
34		"""App initialization (used instead of ``__init__``).
35
36		The setup method is automatically called by the run method.
37		Users shouldn't call this method directly.
38		"""
39	1	self.of_core_version_utils = {0x01: of_core_v0x01_utils,
40		0x04: of_core_v0x04_utils}
41	1	self.execute_as_loop(settings.STATS_INTERVAL)
42
43	1	def execute(self):
44		"""Run once on app 'start' or in a loop.
45
46		The execute method is called by the run method of KytosNApp class.
47		Users shouldn't call this method directly.
48		"""
49	1	for switch in self.controller.switches.values():
50	1	if switch.is_connected():
51	1	self._request_flow_list(switch)
52	1	if settings.SEND_ECHO_REQUESTS:
53	1	version_utils = \
54		self.of_core_version_utils[switch.
55		connection.protocol.version]
56	1	version_utils.send_echo(self.controller, switch)
57
58	1	def _request_flow_list(self, switch):
59		"""Send flow stats request to a connected switch."""
60	1	of_version = switch.connection.protocol.version
61	1	if of_version == 0x01:
62	1	of_core_v0x01_utils.update_flow_list(self.controller, switch)
63	1	of_core_v0x01_utils.request_port_stats(self.controller, switch)
64	1	elif of_version == 0x04:
65	1	xid_flows = of_core_v0x04_utils.update_flow_list(self.controller,
66		switch)
67	1	xid_ports = of_core_v0x04_utils.request_port_stats(self.controller,
68		switch)
69	1	self._multipart_replies_xids[switch.id] = {'flows': xid_flows,
70		'ports': xid_ports}
71
72	1	@listen_to('kytos/of_core.v0x01.messages.in.ofpt_stats_reply')
73		def handle_stats_reply(self, event):
74		"""Handle stats replies for v0x01 switches.
75
76		Args:
77		event (:class:`~kytos.core.events.KytosEvent):
78		Event with ofpt_stats_reply in message.
79		"""
80	1	switch = event.source.switch
81	1	msg = event.content['message']
82	1	if msg.body_type == StatsType.OFPST_FLOW:
83	1	switch.flows = [Flow01.from_of_flow_stats(f, switch)
84		for f in msg.body]
85	1	event_raw = KytosEvent(
86		name='kytos/of_core.flow_stats.received',
87		content={'switch': switch})
88	1	self.controller.buffers.app.put(event_raw)
89	1	elif msg.body_type == StatsType.OFPST_PORT:
90		port_stats = [of_port_stats for of_port_stats in msg.body]
91		port_stats_event = KytosEvent(
92		name=f"kytos/of_core.port_stats",
93		content={
94		'switch': switch,
95		'port_stats': port_stats
96		})
97		self.controller.buffers.app.put(port_stats_event)
98	1	elif msg.body_type == StatsType.OFPST_DESC:
99	1	switch.update_description(msg.body)
100
101	1	@listen_to('kytos/of_core.v0x0[14].messages.in.ofpt_features_reply')
102		def handle_features_reply(self, event):
103		"""Handle kytos/of_core.messages.in.ofpt_features_reply event.
104
105		This is the end of the Handshake workflow of the OpenFlow Protocol.
106
107		Args:
108		event (KytosEvent): Event with features reply message.
109		"""
110	1	connection = event.source
111	1	version_utils = self.of_core_version_utils[connection.protocol.version]
112	1	switch = version_utils.handle_features_reply(self.controller, event)
113
114	1	if (connection.is_during_setup() and
115		connection.protocol.state == 'waiting_features_reply'):
116	1	connection.protocol.state = 'handshake_complete'
117	1	connection.set_established_state()
118	1	version_utils.send_desc_request(self.controller, switch)
119	1	if settings.SEND_SET_CONFIG:
120	1	version_utils.send_set_config(self.controller, switch)
121	1	log.info('Connection %s, Switch %s: OPENFLOW HANDSHAKE COMPLETE',
122		connection.id, switch.dpid)
123	1	event_raw = KytosEvent(
124		name='kytos/of_core.handshake.completed',
125		content={'switch': switch})
126	1	self.controller.buffers.app.put(event_raw)
127
128	1	@listen_to('kytos/of_core.handshake.completed')
129		def on_handshake_completed_request_flow_list(self, event):
130		"""Request an flow list right after the handshake is completed.
131
132		Args:
133		event (KytosEvent): Event with the switch' handshake completed
134		"""
135	1	switch = event.content['switch']
136	1	if switch.is_enabled():
137	1	self._request_flow_list(switch)
138
139	1	@listen_to('kytos/of_core.v0x04.messages.in.ofpt_multipart_reply')
140		def handle_multipart_reply(self, event):
141		"""Handle multipart replies for v0x04 switches.
142
143		Args:
144		event (:class:`~kytos.core.events.KytosEvent):
145		Event with ofpt_multipart_reply in message.
146		"""
147	1	reply = event.content['message']
148	1	switch = event.source.switch
149
150	1	if reply.multipart_type == MultipartType.OFPMP_FLOW:
151	1	self._handle_multipart_flow_stats(reply, switch)
152	1	elif reply.multipart_type == MultipartType.OFPMP_PORT_STATS:
153		self._handle_multipart_port_stats(reply, switch)
154	1	elif reply.multipart_type == MultipartType.OFPMP_PORT_DESC:
155	1	of_core_v0x04_utils.handle_port_desc(self.controller, switch,
156		reply.body)
157	1	elif reply.multipart_type == MultipartType.OFPMP_DESC:
158	1	switch.update_description(reply.body)
159
160	1	def _handle_multipart_flow_stats(self, reply, switch):
161		"""Update switch flows after all replies are received."""
162	1	if self._is_multipart_reply_ours(reply, switch, 'flows'):
163		# Get all flows from the reply
164	1	flows = [Flow04.from_of_flow_stats(of_flow_stats, switch)
165		for of_flow_stats in reply.body]
166		# Get existent flows from the same xid (or create an empty list)
167	1	all_flows = self._multipart_replies_flows.setdefault(switch.id, [])
168	1	all_flows.extend(flows)
169	1	if reply.flags.value % 2 == 0: # Last bit means more replies
170	1	self._update_switch_flows(switch)
171	1	event_raw = KytosEvent(
172		name='kytos/of_core.flow_stats.received',
173		content={'switch': switch})
174	1	self.controller.buffers.app.put(event_raw)
175
176	1	def _handle_multipart_port_stats(self, reply, switch):
177		"""Emit an event about new port stats."""
178	1	if self._is_multipart_reply_ours(reply, switch, 'ports'):
179	1	port_stats = [of_port_stats for of_port_stats in reply.body]
180	1	all_port_stats = self._multipart_replies_ports.setdefault(
181		switch.id, []
182		)
183	1	all_port_stats.extend(port_stats)
184	1	if reply.flags.value % 2 == 0:
185	1	self._new_port_stats(switch)
186
187	1	def _update_switch_flows(self, switch):
188		"""Update controllers' switch flow list and clean resources."""
189	1	switch.flows = self._multipart_replies_flows[switch.id]
190	1	del self._multipart_replies_flows[switch.id]
191	1	del self._multipart_replies_xids[switch.id]['flows']
192
193	1	def _new_port_stats(self, switch):
194		"""Send an event with the new port stats and clean resources."""
195		all_port_stats = self._multipart_replies_ports[switch.id]
196		del self._multipart_replies_ports[switch.id]
197		del self._multipart_replies_xids[switch.id]['ports']
198		port_stats_event = KytosEvent(
199		name=f"kytos/of_core.port_stats",
200		content={
201		'switch': switch,
202		'port_stats': all_port_stats
203		})
204		self.controller.buffers.app.put(port_stats_event)
205
206	1	def _is_multipart_reply_ours(self, reply, switch, stat):
207		"""Return whether we are expecting the reply."""
208	1	if switch.id in self._multipart_replies_xids:
209	1	sent_xid = self._multipart_replies_xids[switch.id].get(stat)
210	1	if sent_xid == reply.header.xid:
211	1	return True
212	1	return False
213
214	1	@listen_to('kytos/core.openflow.raw.in')
215		def handle_raw_in(self, event):
216		"""Handle a RawEvent and generate a kytos/core.messages.in.* event.
217
218		Args:
219		event (KytosEvent): RawEvent with openflow message to be unpacked
220		"""
221		# If the switch is already known to the controller, update the
222		# 'lastseen' attribute
223	1	switch = event.source.switch
224	1	if switch:
225	1	switch.update_lastseen()
226
227	1	connection = event.source
228
229	1	data = connection.remaining_data + event.content['new_data']
230	1	packets, connection.remaining_data = of_slicer(data)
231	1	if not packets:
232		return
233
234	1	unprocessed_packets = []
235
236	1	for packet in packets:
237	1	if not connection.is_alive():
238		return
239
240	1	if connection.is_new():
241	1	try:
242	1	message = GenericHello(packet=packet)
243	1	self._negotiate(connection, message)
244	1	except (UnpackException, NegotiationException) as err:
245	1	if isinstance(err, UnpackException):
246		log.error('Connection %s: Invalid hello message',
247		connection.id)
248		else:
249	1	log.error('Connection %s: Negotiation Failed',
250		connection.id)
251	1	connection.protocol.state = 'hello_failed'
252	1	connection.close()
253	1	connection.state = ConnectionState.FAILED
254	1	return
255	1	connection.set_setup_state()
256	1	continue
257
258	1	try:
259	1	message = connection.protocol.unpack(packet)
260	1	if message.header.message_type == Type.OFPT_ERROR:
261		log.error("OFPT_ERROR: %s error code received from"
262		" switch %s with xid %s", message.code,
263		switch.dpid, message.header.xid)
264	1	except (UnpackException, AttributeError) as err:
265	1	log.error(err)
266	1	if isinstance(err, AttributeError):
267	1	error_msg = 'connection closed before version negotiation'
268	1	log.error('Connection %s: %s', connection.id, error_msg)
269	1	connection.close()
270	1	return
271
272	1	log.debug('Connection %s: IN OFP, version: %s, type: %s, xid: %s',
273		connection.id,
274		message.header.version,
275		message.header.message_type,
276		message.header.xid)
277
278	1	waiting_features_reply = (
279		str(message.header.message_type) == 'Type.OFPT_FEATURES_REPLY'
280		and connection.protocol.state == 'waiting_features_reply')
281
282	1	if connection.is_during_setup() and not waiting_features_reply:
283		unprocessed_packets.append(packet)
284		continue
285
286	1	self.emit_message_in(connection, message)
287
288	1	connection.remaining_data = b''.join(unprocessed_packets) + \
289		connection.remaining_data
290
291	1	def emit_message_in(self, connection, message):
292		"""Emit a KytosEvent for each incoming message.
293
294		Also update links and port status.
295		"""
296	1	if not connection.is_alive():
297		return
298	1	emit_message_in(self.controller, connection, message)
299	1	msg_type = message.header.message_type.name.lower()
300	1	if msg_type == 'ofpt_port_status':
301	1	self.update_port_status(message, connection)
302	1	elif msg_type == 'ofpt_packet_in':
303	1	self.update_links(message, connection)
304
305	1	def emit_message_out(self, connection, message):
306		"""Emit a KytosEvent for each outgoing message."""
307	1	if connection.is_alive():
308	1	emit_message_out(self.controller, connection, message)
309
310	1	@listen_to('kytos/of_core.v0x0[14].messages.in.ofpt_echo_request')
311		def handle_echo_request(self, event):
312		"""Handle Echo Request Messages.
313
314		This method will get a echo request sent by client and generate a
315		echo reply as answer.
316
317		Args:
318		event (:class:`~kytos.core.events.KytosEvent`):
319		Event with echo request in message.
320
321		"""
322	1	pyof_lib = PYOF_VERSION_LIBS[event.source.protocol.version]
323	1	echo_request = event.message
324	1	echo_reply = pyof_lib.symmetric.echo_reply.EchoReply(
325		xid=echo_request.header.xid,
326		data=echo_request.data)
327	1	self.emit_message_out(event.source, echo_reply)
328
329	1	def _negotiate(self, connection, message):
330		"""Handle hello messages.
331
332		This method will handle the incoming hello message by client
333		and deal with negotiation.
334
335		Parameters:
336		event (KytosMessageInHello): KytosMessageInHelloEvent
337
338		"""
339	1	if message.versions:
340	1	version = _get_version_from_bitmask(message.versions)
341		else:
342	1	version = _get_version_from_header(message.header.version)
343
344	1	log.debug('connection %s: negotiated version - %s',
345		connection.id, str(version))
346
347	1	if version is None:
348	1	self.fail_negotiation(connection, message)
349	1	raise NegotiationException()
350
351	1	version_utils = self.of_core_version_utils[version]
352	1	version_utils.say_hello(self.controller, connection)
353
354	1	connection.protocol.name = 'openflow'
355	1	connection.protocol.version = version
356	1	connection.protocol.unpack = unpack
357	1	connection.protocol.state = 'sending_features'
358	1	self.send_features_request(connection)
359	1	log.debug('Connection %s: Hello complete', connection.id)
360
361	1	def fail_negotiation(self, connection, hello_message):
362		"""Send Error message and emit event upon negotiation failure."""
363	1	log.warning('connection %s: version negotiation failed',
364		connection.id)
365	1	connection.protocol.state = 'hello_failed'
366	1	event_raw = KytosEvent(
367		name='kytos/of_core.hello_failed',
368		content={'source': connection})
369	1	self.controller.buffers.app.put(event_raw)
370
371	1	version = max(settings.OPENFLOW_VERSIONS)
372	1	pyof_lib = PYOF_VERSION_LIBS[version]
373
374	1	error_message = pyof_lib.asynchronous.error_msg.ErrorMsg(
375		xid=hello_message.header.xid,
376		error_type=pyof_lib.asynchronous.error_msg.
377		ErrorType.OFPET_HELLO_FAILED,
378		code=pyof_lib.asynchronous.error_msg.HelloFailedCode.
379		OFPHFC_INCOMPATIBLE)
380	1	self.emit_message_out(connection, error_message)
381
382		# May be removed
383	1	@listen_to('kytos/of_core.v0x0[14].messages.out.ofpt_echo_reply')
384		def handle_queued_openflow_echo_reply(self, event):
385		"""Handle queued OpenFlow echo reply messages.
386
387		Send a feature request message if SEND_FEATURES_REQUEST_ON_ECHO
388		is True (default is False).
389		"""
390	1	if settings.SEND_FEATURES_REQUEST_ON_ECHO:
391	1	self.send_features_request(event.destination)
392
393	1	def send_features_request(self, destination):
394		"""Send a feature request to the switch."""
395	1	version = destination.protocol.version
396	1	pyof_lib = PYOF_VERSION_LIBS[version]
397	1	features_request = pyof_lib.controller2switch.\
398		features_request.FeaturesRequest()
399	1	self.emit_message_out(destination, features_request)
400
401		# pylint: disable=no-self-use
402	1	@listen_to('kytos/of_core.v0x0[14].messages.out.ofpt_features_request')
403		def handle_features_request_sent(self, event):
404		"""Ensure request has actually been sent before changing state."""
405	1	if event.destination.protocol.state == 'sending_features':
406	1	event.destination.protocol.state = 'waiting_features_reply'
407		# pylint: enable=no-self-use
408
409	1	@staticmethod
410	1	@listen_to('kytos/of_core.v0x[0-9a-f]{2}.messages.in.hello_failed',
411		'kytos/of_core.v0x0[14].messages.out.hello_failed')
412		def handle_openflow_in_hello_failed(event):
413		"""Close the connection upon hello failure."""
414	1	event.destination.close()
415	1	log.debug("Connection %s: Connection closed.", event.destination.id)
416
417	1	def shutdown(self):
418		"""End of the application."""
419	1	log.debug('Shutting down...')
420
421	1	def update_links(self, message, source):
422		"""Dispatch 'reacheable.mac' event.
423
424		Args:
425		message: python openflow (pyof) PacketIn object.
426		source: kytos.core.switch.Connection instance.
427
428		Dispatch:
429		`reachable.mac`:
430		{
431		switch : <switch.id>,
432		port: <port.port_no>
433		reachable_mac: <mac_address>
434		}
435
436		"""
437	1	ethernet = Ethernet()
438	1	ethernet.unpack(message.data.value)
439	1	if ethernet.ether_type in (EtherType.LLDP, EtherType.IPV6):
440		return
441
442	1	try:
443	1	port = source.switch.get_interface_by_port_no(
444		message.in_port.value)
445	1	except AttributeError:
446	1	port = source.switch.get_interface_by_port_no(message.in_port)
447
448	1	name = 'kytos/of_core.reachable.mac'
449	1	content = {'switch': source.switch,
450		'port': port,
451		'reachable_mac': ethernet.source.value}
452	1	event = KytosEvent(name, content)
453	1	self.controller.buffers.app.put(event)
454
455	1	msg = 'The MAC %s is reachable from switch/port %s/%s.'
456	1	log.debug(msg, ethernet.source, source.switch.id,
457		message.in_port)
458
459	1	def _send_specific_port_mod(self, port, interface, current_state):
460		"""Dispatch port link_up/link_down events."""
461	1	event_name = 'kytos/of_core.switch.interface.'
462	1	event_content = {'interface': interface}
463
464	1	if port.state.value % 2:
465	1	status = 'link_down'
466		else:
467	1	status = 'link_up'
468
469	1	if current_state:
470	1	if current_state % 2:
471	1	current_status = 'link_down'
472		else:
473	1	current_status = 'link_up'
474		else:
475	1	current_status = None
476
477	1	if status != current_status:
478	1	event = KytosEvent(name=event_name+status, content=event_content)
479	1	self.controller.buffers.app.put(event)
480
481	1	def update_port_status(self, port_status, source):
482		"""Dispatch 'port.*' events.
483
484		Current events:
485
486		created\|deleted\|link_up\|link_down\|modified
487
488		Args:
489		port_status: python openflow (pyof) PortStatus object.
490		source: kytos.core.switch.Connection instance.
491
492		Dispatch:
493		`kytos/of_core.switch.port.[created\|modified\|deleted]`:
494		{
495		switch : <switch.id>,
496		port: <port.port_no>
497		port_description: {<description of the port>}
498		}
499
500		"""
501	1	reason = port_status.reason.enum_ref(port_status.reason.value).name
502	1	port = port_status.desc
503	1	port_no = port.port_no.value
504	1	event_name = 'kytos/of_core.switch.interface.'
505
506	1	if reason == 'OFPPR_ADD':
507	1	status = 'created'
508	1	interface = Interface(name=port.name.value,
509		address=port.hw_addr.value,
510		port_number=port_no,
511		switch=source.switch,
512		state=port.state.value,
513		features=port.curr)
514	1	source.switch.update_interface(interface)
515
516	1	elif reason == 'OFPPR_MODIFY':
517	1	status = 'modified'
518	1	interface = source.switch.get_interface_by_port_no(port_no)
519	1	current_status = None
520	1	if interface:
521	1	log.info('Modified %s %s:%s' %
522		(interface, interface.switch.dpid,
523		interface.port_number))
524	1	current_status = interface.state
525	1	interface.state = port.state.value
526	1	interface.name = port.name.value
527	1	interface.address = port.hw_addr.value
528	1	interface.features = port.curr
529		else:
530	1	interface = Interface(name=port.name.value,
531		address=port.hw_addr.value,
532		port_number=port_no,
533		switch=source.switch,
534		state=port.state.value,
535		features=port.curr)
536	1	source.switch.update_interface(interface)
537	1	self._send_specific_port_mod(port, interface, current_status)
538
539	1	elif reason == 'OFPPR_DELETE':
540	1	status = 'deleted'
541	1	interface = source.switch.get_interface_by_port_no(port_no)
542	1	source.switch.remove_interface(interface)
543
544	1	event_name += status
		0 ignored issues – show introduced 2019-02-18 13:53 UTC by Report Bug Copy Issue Report The variable `status` does not seem to be defined for all execution paths. Loading history...
545	1	content = {'interface': interface}
		0 ignored issues – show introduced 2019-02-18 13:53 UTC by Report Bug Copy Issue Report The variable `interface` does not seem to be defined for all execution paths. Loading history...
546
547	1	event = KytosEvent(name=event_name, content=content)
548	1	self.controller.buffers.app.put(event)
549
550	1	msg = 'The port %s from switch %s was %s.'
551	1	log.debug(msg, port_status.desc.port_no, source.switch.id, status)
552
553
554	1	def _get_version_from_bitmask(message_versions):
555		"""Get common version from hello message version bitmap."""
556		try:
557		return max([version for version in message_versions
558		if version in settings.OPENFLOW_VERSIONS])
559		except ValueError:
560		return None
561
562
563	1	def _get_version_from_header(message_version):
564		"""Get common version from hello message header version."""
565		version = min(message_version, max(settings.OPENFLOW_VERSIONS))
566		return version if version in settings.OPENFLOW_VERSIONS else None
567

kytos / of_core

build.main.Main.handle_features_reply() A last analyzed 2021-05-26 15:17 UTC

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build.main.Main.handle_features_reply() A
last analyzed 2021-05-26 15:17 UTC