713 lines
24 KiB
Python
713 lines
24 KiB
Python
"""
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TODO: probably goes away, or implement the usage of "unshare", or docker formal.
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"""
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import logging
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import socket
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import threading
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from socket import AF_INET
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from socket import AF_INET6
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from core import CoreCommandError, utils
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from core import constants
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from core.nodes.base import CoreNetworkBase
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from core.emulator.data import LinkData
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from core.emulator.enumerations import LinkTypes
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from core.emulator.enumerations import NodeTypes
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from core.emulator.enumerations import RegisterTlvs
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from core.nodes import ipaddress
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from core.nodes.interface import GreTap
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from core.nodes.interface import Veth
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from core.nodes.network import EbtablesQueue
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from core.nodes.network import GreTapBridge
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# a global object because all WLANs share the same queue
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# cannot have multiple threads invoking the ebtables commnd
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ebtables_queue = EbtablesQueue()
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ebtables_lock = threading.Lock()
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utils.check_executables([
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constants.IP_BIN,
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constants.EBTABLES_BIN,
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constants.TC_BIN
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])
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def ebtables_commands(call, commands):
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with ebtables_lock:
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for command in commands:
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call(command)
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class OvsNet(CoreNetworkBase):
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"""
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Used to be LxBrNet.
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Base class for providing Openvswitch functionality to objects that create bridges.
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"""
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policy = "DROP"
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def __init__(self, session, _id=None, name=None, start=True, policy=None):
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"""
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Creates an OvsNet instance.
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:param core.emulator.session.Session session: session this object is a part of
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:param int _id: object id
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:param str name: object name
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:param bool start: start flag
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:param policy: network policy
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"""
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CoreNetworkBase.__init__(self, session, _id, name, start)
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if policy:
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self.policy = policy
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else:
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self.policy = self.__class__.policy
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session_id = self.session.short_session_id()
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self.bridge_name = "b.%s.%s" % (str(self.id), session_id)
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self.up = False
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if start:
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self.startup()
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ebtables_queue.startupdateloop(self)
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def startup(self):
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"""
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:return:
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:raises CoreCommandError: when there is a command exception
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"""
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utils.check_cmd([constants.OVS_BIN, "add-br", self.bridge_name])
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# turn off spanning tree protocol and forwarding delay
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# TODO: appears stp and rstp are off by default, make sure this always holds true
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# TODO: apears ovs only supports rstp forward delay and again it's off by default
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utils.check_cmd([constants.IP_BIN, "link", "set", self.bridge_name, "up"])
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# create a new ebtables chain for this bridge
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ebtables_commands(utils.check_cmd, [
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[constants.EBTABLES_BIN, "-N", self.bridge_name, "-P", self.policy],
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[constants.EBTABLES_BIN, "-A", "FORWARD", "--logical-in", self.bridge_name, "-j", self.bridge_name]
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])
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self.up = True
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def shutdown(self):
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if not self.up:
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logging.info("exiting shutdown, object is not up")
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return
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ebtables_queue.stopupdateloop(self)
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try:
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utils.check_cmd([constants.IP_BIN, "link", "set", self.bridge_name, "down"])
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utils.check_cmd([constants.OVS_BIN, "del-br", self.bridge_name])
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ebtables_commands(utils.check_cmd, [
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[constants.EBTABLES_BIN, "-D", "FORWARD", "--logical-in", self.bridge_name, "-j", self.bridge_name],
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[constants.EBTABLES_BIN, "-X", self.bridge_name]
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])
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except CoreCommandError:
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logging.exception("error bringing bridge down and removing it")
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# removes veth pairs used for bridge-to-bridge connections
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for interface in self.netifs():
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interface.shutdown()
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self._netif.clear()
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self._linked.clear()
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del self.session
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self.up = False
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def attach(self, interface):
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if self.up:
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utils.check_cmd([constants.OVS_BIN, "add-port", self.bridge_name, interface.localname])
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utils.check_cmd([constants.IP_BIN, "link", "set", interface.localname, "up"])
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CoreNetworkBase.attach(self, interface)
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def detach(self, interface):
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if self.up:
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utils.check_cmd([constants.OVS_BIN, "del-port", self.bridge_name, interface.localname])
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CoreNetworkBase.detach(self, interface)
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def linked(self, interface_one, interface_two):
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# check if the network interfaces are attached to this network
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if self._netif[interface_one.netifi] != interface_one:
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raise ValueError("inconsistency for interface %s" % interface_one.name)
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if self._netif[interface_two.netifi] != interface_two:
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raise ValueError("inconsistency for interface %s" % interface_two.name)
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try:
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linked = self._linked[interface_one][interface_two]
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except KeyError:
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if self.policy == "ACCEPT":
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linked = True
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elif self.policy == "DROP":
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linked = False
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else:
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raise ValueError("unknown policy: %s" % self.policy)
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self._linked[interface_one][interface_two] = linked
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return linked
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def unlink(self, interface_one, interface_two):
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"""
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Unlink two PyCoreNetIfs, resulting in adding or removing ebtables
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filtering rules.
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"""
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with self._linked_lock:
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if not self.linked(interface_one, interface_two):
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return
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self._linked[interface_one][interface_two] = False
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ebtables_queue.ebchange(self)
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def link(self, interface_one, interface_two):
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"""
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Link two interfaces together, resulting in adding or removing
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ebtables filtering rules.
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"""
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with self._linked_lock:
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if self.linked(interface_one, interface_two):
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return
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self._linked[interface_one][interface_two] = True
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ebtables_queue.ebchange(self)
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def linkconfig(self, netif, bw=None, delay=None, loss=None, duplicate=None,
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jitter=None, netif2=None, devname=None):
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"""
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Configure link parameters by applying tc queuing disciplines on the
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interface.
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"""
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if not devname:
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devname = netif.localname
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tc = [constants.TC_BIN, "qdisc", "replace", "dev", devname]
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parent = ["root"]
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# attempt to set bandwidth and update as needed if value changed
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bandwidth_changed = netif.setparam("bw", bw)
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if bandwidth_changed:
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# from tc-tbf(8): minimum value for burst is rate / kernel_hz
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if bw > 0:
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if self.up:
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burst = max(2 * netif.mtu, bw / 1000)
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limit = 0xffff # max IP payload
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tbf = ["tbf", "rate", str(bw), "burst", str(burst), "limit", str(limit)]
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logging.info("linkconfig: %s" % [tc + parent + ["handle", "1:"] + tbf])
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utils.check_cmd(tc + parent + ["handle", "1:"] + tbf)
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netif.setparam("has_tbf", True)
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elif netif.getparam("has_tbf") and bw <= 0:
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tcd = [] + tc
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tcd[2] = "delete"
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if self.up:
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utils.check_cmd(tcd + parent)
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netif.setparam("has_tbf", False)
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# removing the parent removes the child
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netif.setparam("has_netem", False)
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if netif.getparam("has_tbf"):
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parent = ["parent", "1:1"]
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netem = ["netem"]
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delay_changed = netif.setparam("delay", delay)
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if loss is not None:
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loss = int(loss)
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loss_changed = netif.setparam("loss", loss)
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if duplicate is not None:
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duplicate = int(duplicate)
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duplicate_changed = netif.setparam("duplicate", duplicate)
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jitter_changed = netif.setparam("jitter", jitter)
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# if nothing changed return
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if not any([bandwidth_changed, delay_changed, loss_changed, duplicate_changed, jitter_changed]):
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return
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# jitter and delay use the same delay statement
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if delay is not None:
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netem += ["delay", "%sus" % delay]
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else:
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netem += ["delay", "0us"]
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if jitter is not None:
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netem += ["%sus" % jitter, "25%"]
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if loss is not None and loss > 0:
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netem += ["loss", "%s%%" % min(loss, 100)]
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if duplicate is not None and duplicate > 0:
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netem += ["duplicate", "%s%%" % min(duplicate, 100)]
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if delay <= 0 and jitter <= 0 and loss <= 0 and duplicate <= 0:
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# possibly remove netem if it exists and parent queue wasn"t removed
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if not netif.getparam("has_netem"):
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return
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tc[2] = "delete"
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if self.up:
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logging.info("linkconfig: %s" % ([tc + parent + ["handle", "10:"]],))
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utils.check_cmd(tc + parent + ["handle", "10:"])
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netif.setparam("has_netem", False)
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elif len(netem) > 1:
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if self.up:
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logging.info("linkconfig: %s" % ([tc + parent + ["handle", "10:"] + netem],))
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utils.check_cmd(tc + parent + ["handle", "10:"] + netem)
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netif.setparam("has_netem", True)
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def linknet(self, network):
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"""
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Link this bridge with another by creating a veth pair and installing
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each device into each bridge.
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"""
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session_id = self.session.short_session_id()
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try:
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_id = "%x" % self.id
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except TypeError:
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_id = "%s" % self.id
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try:
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network_id = "%x" % network.id
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except TypeError:
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network_id = "%s" % network.id
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localname = "veth%s.%s.%s" % (_id, network_id, session_id)
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if len(localname) >= 16:
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raise ValueError("interface local name %s too long" % localname)
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name = "veth%s.%s.%s" % (network_id, _id, session_id)
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if len(name) >= 16:
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raise ValueError("interface name %s too long" % name)
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interface = Veth(node=None, name=name, localname=localname, mtu=1500, net=self, start=self.up)
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self.attach(interface)
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if network.up:
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# this is similar to net.attach() but uses netif.name instead of localname
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utils.check_cmd([constants.OVS_BIN, "add-port", network.bridge_name, interface.name])
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utils.check_cmd([constants.IP_BIN, "link", "set", interface.name, "up"])
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network.attach(interface)
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interface.net = self
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interface.othernet = network
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return interface
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def getlinknetif(self, network):
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"""
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Return the interface of that links this net with another net
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(that were linked using linknet()).
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"""
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for interface in self.netifs():
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if hasattr(interface, "othernet") and interface.othernet == network:
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return interface
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return None
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def addrconfig(self, addresses):
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"""
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Set addresses on the bridge.
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"""
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if not self.up:
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return
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for address in addresses:
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utils.check_cmd([constants.IP_BIN, "addr", "add", str(address), "dev", self.bridge_name])
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class OvsCtrlNet(OvsNet):
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policy = "ACCEPT"
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CTRLIF_IDX_BASE = 99 # base control interface index
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DEFAULT_PREFIX_LIST = [
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"172.16.0.0/24 172.16.1.0/24 172.16.2.0/24 172.16.3.0/24 172.16.4.0/24",
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"172.17.0.0/24 172.17.1.0/24 172.17.2.0/24 172.17.3.0/24 172.17.4.0/24",
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"172.18.0.0/24 172.18.1.0/24 172.18.2.0/24 172.18.3.0/24 172.18.4.0/24",
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"172.19.0.0/24 172.19.1.0/24 172.19.2.0/24 172.19.3.0/24 172.19.4.0/24"
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]
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def __init__(self, session, _id="ctrlnet", name=None, prefix=None, hostid=None,
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start=True, assign_address=True, updown_script=None, serverintf=None):
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self.prefix = ipaddress.Ipv4Prefix(prefix)
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self.hostid = hostid
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self.assign_address = assign_address
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self.updown_script = updown_script
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self.serverintf = serverintf
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OvsNet.__init__(self, session, _id=_id, name=name, start=start)
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def startup(self):
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if self.detectoldbridge():
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return
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OvsNet.startup(self)
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if self.hostid:
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addr = self.prefix.addr(self.hostid)
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else:
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addr = self.prefix.max_addr()
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message = "Added control network bridge: %s %s" % (self.bridge_name, self.prefix)
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addresses = ["%s/%s" % (addr, self.prefix.prefixlen)]
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if self.assign_address:
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self.addrconfig(addresses=addresses)
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message += " address %s" % addr
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logging.info(message)
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if self.updown_script:
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logging.info("interface %s updown script %s startup called" % (self.bridge_name, self.updown_script))
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utils.check_cmd([self.updown_script, self.bridge_name, "startup"])
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if self.serverintf:
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utils.check_cmd([constants.OVS_BIN, "add-port", self.bridge_name, self.serverintf])
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utils.check_cmd([constants.IP_BIN, "link", "set", self.serverintf, "up"])
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def detectoldbridge(self):
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"""
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Occasionally, control net bridges from previously closed sessions are not cleaned up.
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Check if there are old control net bridges and delete them
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"""
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output = utils.check_cmd([constants.OVS_BIN, "list-br"])
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output = output.strip()
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if output:
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for line in output.split("\n"):
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bride_name = line.split(".")
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if bride_name[0] == "b" and bride_name[1] == self.id:
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logging.error("older session may still be running with conflicting id for bridge: %s", line)
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return True
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return False
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def shutdown(self):
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if self.serverintf:
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try:
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utils.check_cmd([constants.OVS_BIN, "del-port", self.bridge_name, self.serverintf])
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except CoreCommandError:
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logging.exception("error deleting server interface %s to controlnet bridge %s",
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self.serverintf, self.bridge_name)
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if self.updown_script:
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try:
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logging.info("interface %s updown script (%s shutdown) called", self.bridge_name, self.updown_script)
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utils.check_cmd([self.updown_script, self.bridge_name, "shutdown"])
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except CoreCommandError:
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logging.exception("error during updown script shutdown")
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OvsNet.shutdown(self)
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def all_link_data(self, flags):
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"""
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Do not include CtrlNet in link messages describing this session.
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"""
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return []
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class OvsPtpNet(OvsNet):
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policy = "ACCEPT"
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def attach(self, interface):
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if len(self._netif) >= 2:
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raise ValueError("point-to-point links support at most 2 network interfaces")
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OvsNet.attach(self, interface)
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def data(self, message_type, lat=None, lon=None, alt=None):
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"""
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Do not generate a Node Message for point-to-point links. They are
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built using a link message instead.
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"""
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return None
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def all_link_data(self, flags):
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"""
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Build CORE API TLVs for a point-to-point link. One Link message describes this network.
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"""
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all_links = []
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if len(self._netif) != 2:
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return all_links
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if1, if2 = self._netif.values()
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unidirectional = 0
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if if1.getparams() != if2.getparams():
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unidirectional = 1
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interface1_ip4 = None
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interface1_ip4_mask = None
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interface1_ip6 = None
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interface1_ip6_mask = None
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for address in if1.addrlist:
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ip, _sep, mask = address.partition("/")
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mask = int(mask)
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if ipaddress.is_ipv4_address(ip):
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family = AF_INET
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ipl = socket.inet_pton(family, ip)
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interface1_ip4 = ipaddress.IpAddress(af=family, address=ipl)
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interface1_ip4_mask = mask
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else:
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family = AF_INET6
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ipl = socket.inet_pton(family, ip)
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interface1_ip6 = ipaddress.IpAddress(af=family, address=ipl)
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interface1_ip6_mask = mask
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interface2_ip4 = None
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interface2_ip4_mask = None
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interface2_ip6 = None
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interface2_ip6_mask = None
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for address in if2.addrlist:
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ip, _sep, mask = address.partition("/")
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mask = int(mask)
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if ipaddress.is_ipv4_address(ip):
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family = AF_INET
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ipl = socket.inet_pton(family, ip)
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interface2_ip4 = ipaddress.IpAddress(af=family, address=ipl)
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interface2_ip4_mask = mask
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else:
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family = AF_INET6
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ipl = socket.inet_pton(family, ip)
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interface2_ip6 = ipaddress.IpAddress(af=family, address=ipl)
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interface2_ip6_mask = mask
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# TODO: not currently used
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# loss=netif.getparam("loss")
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link_data = LinkData(
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message_type=flags,
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node1_id=if1.node.id,
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node2_id=if2.node.id,
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link_type=self.linktype,
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unidirectional=unidirectional,
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delay=if1.getparam("delay"),
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bandwidth=if1.getparam("bw"),
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dup=if1.getparam("duplicate"),
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jitter=if1.getparam("jitter"),
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interface1_id=if1.node.getifindex(if1),
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interface1_mac=if1.hwaddr,
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interface1_ip4=interface1_ip4,
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interface1_ip4_mask=interface1_ip4_mask,
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interface1_ip6=interface1_ip6,
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interface1_ip6_mask=interface1_ip6_mask,
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interface2_id=if2.node.getifindex(if2),
|
|
interface2_mac=if2.hwaddr,
|
|
interface2_ip4=interface2_ip4,
|
|
interface2_ip4_mask=interface2_ip4_mask,
|
|
interface2_ip6=interface2_ip6,
|
|
interface2_ip6_mask=interface2_ip6_mask,
|
|
)
|
|
|
|
all_links.append(link_data)
|
|
|
|
# build a 2nd link message for the upstream link parameters
|
|
# (swap if1 and if2)
|
|
if unidirectional:
|
|
link_data = LinkData(
|
|
message_type=0,
|
|
node1_id=if2.node.id,
|
|
node2_id=if1.node.id,
|
|
delay=if1.getparam("delay"),
|
|
bandwidth=if1.getparam("bw"),
|
|
dup=if1.getparam("duplicate"),
|
|
jitter=if1.getparam("jitter"),
|
|
unidirectional=1,
|
|
interface1_id=if2.node.getifindex(if2),
|
|
interface2_id=if1.node.getifindex(if1)
|
|
)
|
|
all_links.append(link_data)
|
|
|
|
return all_links
|
|
|
|
|
|
class OvsSwitchNode(OvsNet):
|
|
apitype = NodeTypes.SWITCH.value
|
|
policy = "ACCEPT"
|
|
type = "lanswitch"
|
|
|
|
|
|
class OvsHubNode(OvsNet):
|
|
apitype = NodeTypes.HUB.value
|
|
policy = "ACCEPT"
|
|
type = "hub"
|
|
|
|
def __init__(self, session, _id=None, name=None, start=True):
|
|
"""
|
|
the Hub node forwards packets to all bridge ports by turning off
|
|
the MAC address learning
|
|
"""
|
|
OvsNet.__init__(self, session, _id, name, start)
|
|
|
|
if start:
|
|
# TODO: verify that the below flow accomplishes what is desired for a "HUB"
|
|
# TODO: replace "brctl setageing 0"
|
|
utils.check_cmd([constants.OVS_FLOW_BIN, "add-flow", self.bridge_name, "action=flood"])
|
|
|
|
|
|
class OvsWlanNode(OvsNet):
|
|
apitype = NodeTypes.WIRELESS_LAN.value
|
|
linktype = LinkTypes.WIRELESS.value
|
|
policy = "DROP"
|
|
type = "wlan"
|
|
|
|
def __init__(self, session, _id=None, name=None, start=True, policy=None):
|
|
OvsNet.__init__(self, session, _id, name, start, policy)
|
|
|
|
# wireless model such as basic range
|
|
self.model = None
|
|
# mobility model such as scripted
|
|
self.mobility = None
|
|
|
|
def attach(self, interface):
|
|
OvsNet.attach(self, interface)
|
|
|
|
if self.model:
|
|
interface.poshook = self.model.position_callback
|
|
|
|
if interface.node is None:
|
|
return
|
|
|
|
x, y, z = interface.node.position.get()
|
|
# invokes any netif.poshook
|
|
interface.setposition(x, y, z)
|
|
# self.model.setlinkparams()
|
|
|
|
def setmodel(self, model, config=None):
|
|
"""
|
|
Mobility and wireless model.
|
|
"""
|
|
logging.info("adding model %s", model.name)
|
|
|
|
if model.type == RegisterTlvs.WIRELESS.value:
|
|
self.model = model(session=self.session, _id=self.id, config=config)
|
|
if self.model.position_callback:
|
|
for interface in self.netifs():
|
|
interface.poshook = self.model.position_callback
|
|
if interface.node is not None:
|
|
x, y, z = interface.node.position.get()
|
|
interface.poshook(interface, x, y, z)
|
|
self.model.setlinkparams()
|
|
elif model.type == RegisterTlvs.MOBILITY.value:
|
|
self.mobility = model(session=self.session, _id=self.id, config=config)
|
|
|
|
def updatemodel(self, config):
|
|
if not self.model:
|
|
raise ValueError("no model set to update for node(%s)", self.id)
|
|
logging.info("node(%s) updating model(%s): %s", self.id, self.model.name, config)
|
|
self.model.set_configs(config, node_id=self.id)
|
|
if self.model.position_callback:
|
|
for netif in self.netifs():
|
|
netif.poshook = self.model.position_callback
|
|
if netif.node is not None:
|
|
x, y, z = netif.node.position.get()
|
|
netif.poshook(netif, x, y, z)
|
|
self.model.updateconfig()
|
|
|
|
def all_link_data(self, flags):
|
|
all_links = OvsNet.all_link_data(self, flags)
|
|
|
|
if self.model:
|
|
all_links.extend(self.model.all_link_data(flags))
|
|
|
|
return all_links
|
|
|
|
|
|
class OvsTunnelNode(GreTapBridge):
|
|
apitype = NodeTypes.TUNNEL.value
|
|
policy = "ACCEPT"
|
|
type = "tunnel"
|
|
|
|
|
|
class OvsGreTapBridge(OvsNet):
|
|
"""
|
|
A network consisting of a bridge with a gretap device for tunneling to
|
|
another system.
|
|
"""
|
|
|
|
def __init__(self, session, remoteip=None, _id=None, name=None, policy="ACCEPT",
|
|
localip=None, ttl=255, key=None, start=True):
|
|
OvsNet.__init__(self, session=session, _id=_id, name=name, policy=policy, start=False)
|
|
self.grekey = key
|
|
if self.grekey is None:
|
|
self.grekey = self.session.id ^ self.id
|
|
|
|
self.localnum = None
|
|
self.remotenum = None
|
|
self.remoteip = remoteip
|
|
self.localip = localip
|
|
self.ttl = ttl
|
|
|
|
if remoteip is None:
|
|
self.gretap = None
|
|
else:
|
|
self.gretap = GreTap(node=self, session=session, remoteip=remoteip,
|
|
localip=localip, ttl=ttl, key=self.grekey)
|
|
if start:
|
|
self.startup()
|
|
|
|
def startup(self):
|
|
"""
|
|
Creates a bridge and adds the gretap device to it.
|
|
"""
|
|
OvsNet.startup(self)
|
|
|
|
if self.gretap:
|
|
self.attach(self.gretap)
|
|
|
|
def shutdown(self):
|
|
"""
|
|
Detach the gretap device and remove the bridge.
|
|
"""
|
|
if self.gretap:
|
|
self.detach(self.gretap)
|
|
self.gretap.shutdown()
|
|
self.gretap = None
|
|
|
|
OvsNet.shutdown(self)
|
|
|
|
def addrconfig(self, addresses):
|
|
"""
|
|
Set the remote tunnel endpoint. This is a one-time method for
|
|
creating the GreTap device, which requires the remoteip at startup.
|
|
The 1st address in the provided list is remoteip, 2nd optionally
|
|
specifies localip.
|
|
"""
|
|
if self.gretap:
|
|
raise ValueError("gretap already exists for %s" % self.name)
|
|
|
|
remoteip = addresses[0].split("/")[0]
|
|
localip = None
|
|
|
|
if len(addresses) > 1:
|
|
localip = addresses[1].split("/")[0]
|
|
|
|
self.gretap = GreTap(session=self.session, remoteip=remoteip,
|
|
localip=localip, ttl=self.ttl, key=self.grekey)
|
|
self.attach(self.gretap)
|
|
|
|
def setkey(self, key):
|
|
"""
|
|
Set the GRE key used for the GreTap device. This needs to be set
|
|
prior to instantiating the GreTap device (before addrconfig).
|
|
"""
|
|
self.grekey = key
|
|
|
|
|
|
OVS_NODES = {
|
|
NodeTypes.SWITCH: OvsSwitchNode,
|
|
NodeTypes.HUB: OvsHubNode,
|
|
NodeTypes.WIRELESS_LAN: OvsWlanNode,
|
|
NodeTypes.TUNNEL: OvsTunnelNode,
|
|
NodeTypes.TAP_BRIDGE: OvsGreTapBridge,
|
|
NodeTypes.PEER_TO_PEER: OvsPtpNet,
|
|
NodeTypes.CONTROL_NET: OvsCtrlNet
|
|
}
|