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virt-manager/virtinst/devices/interface.py
Cole Robinson 97ea737386 devices: interface: Have x86 fallback model be e1000 
libvirt will use rtl8139, but the qemu default changed a while
ago to e1000, and libvirt has diverged. e1000 is more modern and
considered the better default here, so use it
2018-09-29 14:35:28 -04:00

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#
# Copyright 2006-2009, 2013 Red Hat, Inc.
# Jeremy Katz <katzj@redhat.com>
#
# This work is licensed under the GNU GPLv2 or later.
# See the COPYING file in the top-level directory.
import logging
import os
import random
from .. import util
from .device import Device
from ..xmlbuilder import XMLBuilder, XMLChildProperty, XMLProperty
def _random_mac(conn):
"""Generate a random MAC address.
00-16-3E allocated to xensource
52-54-00 used by qemu/kvm
The OUI list is available at https://standards.ieee.org/regauth/oui/oui.txt.
The remaining 3 fields are random, with the first bit of the first
random field set 0.
@return: MAC address string
"""
if conn.is_qemu():
oui = [0x52, 0x54, 0x00]
else:
# Xen
oui = [0x00, 0x16, 0x3E]
mac = oui + [
random.randint(0x00, 0xff),
random.randint(0x00, 0xff),
random.randint(0x00, 0xff)]
return ':'.join(["%02x" % x for x in mac])
def _default_route():
route_file = "/proc/net/route"
if not os.path.exists(route_file):
logging.debug("route_file=%s does not exist", route_file)
return None
for line in open(route_file):
info = line.split()
if len(info) != 11:
logging.debug("Unexpected field count=%s when parsing %s",
len(info), route_file)
break
try:
route = int(info[1], 16)
if route == 0:
return info[0]
except ValueError:
continue
return None
def _default_bridge(conn):
if "VIRTINST_TEST_SUITE" in os.environ:
return "eth0"
if conn.is_remote():
return None
dev = _default_route()
if not dev:
return None
# New style peth0 == phys dev, eth0 == bridge, eth0 == default route
if os.path.exists("/sys/class/net/%s/bridge" % dev):
return dev
# Old style, peth0 == phys dev, eth0 == netloop, xenbr0 == bridge,
# vif0.0 == netloop enslaved, eth0 == default route
try:
defn = int(dev[-1])
except Exception:
defn = -1
if (defn >= 0 and
os.path.exists("/sys/class/net/peth%d/brport" % defn) and
os.path.exists("/sys/class/net/xenbr%d/bridge" % defn)):
return "xenbr%d"
return None
def _default_network(conn):
ret = _default_bridge(conn)
if ret:
return ["bridge", ret]
return ["network", "default"]
class _VirtualPort(XMLBuilder):
XML_NAME = "virtualport"
type = XMLProperty("./@type")
managerid = XMLProperty("./parameters/@managerid", is_int=True)
typeid = XMLProperty("./parameters/@typeid", is_int=True)
typeidversion = XMLProperty("./parameters/@typeidversion", is_int=True)
instanceid = XMLProperty("./parameters/@instanceid")
profileid = XMLProperty("./parameters/@profileid")
interfaceid = XMLProperty("./parameters/@interfaceid")
class DeviceInterface(Device):
XML_NAME = "interface"
TYPE_BRIDGE = "bridge"
TYPE_VIRTUAL = "network"
TYPE_USER = "user"
TYPE_VHOSTUSER = "vhostuser"
TYPE_ETHERNET = "ethernet"
TYPE_DIRECT = "direct"
@staticmethod
def get_models(guest):
if not guest.os.is_hvm():
return []
ret = []
if guest.type in ["kvm", "qemu", "vz", "test"]:
ret.append("virtio")
if guest.os.is_x86():
if guest.os.is_q35():
ret.append("e1000e")
else:
ret.append("rtl8139")
ret.append("e1000")
if guest.type in ["xen", "test"]:
ret.append("netfront")
ret.sort()
return ret
@staticmethod
def get_network_type_desc(net_type):
"""
Return human readable description for passed network type
"""
desc = net_type.capitalize()
if net_type == DeviceInterface.TYPE_BRIDGE:
desc = _("Shared physical device")
elif net_type == DeviceInterface.TYPE_VIRTUAL:
desc = _("Virtual networking")
elif net_type == DeviceInterface.TYPE_USER:
desc = _("Usermode networking")
return desc
@staticmethod
def generate_mac(conn):
"""
Generate a random MAC that doesn't conflict with any VMs on
the connection.
"""
if conn.fake_conn_predictable():
# Testing hack
return "00:11:22:33:44:55"
for ignore in range(256):
mac = _random_mac(conn)
try:
DeviceInterface.is_conflict_net(conn, mac)
return mac
except RuntimeError:
continue
logging.debug("Failed to generate non-conflicting MAC")
return None
@staticmethod
def is_conflict_net(conn, searchmac):
"""
Raise RuntimeError if the passed mac conflicts with a defined VM
"""
vms = conn.fetch_all_domains()
for vm in vms:
for nic in vm.devices.interface:
nicmac = nic.macaddr or ""
if nicmac.lower() == searchmac.lower():
raise RuntimeError(
_("The MAC address '%s' is in use "
"by another virtual machine.") % searchmac)
###############
# XML helpers #
###############
def _get_source(self):
"""
Convenience function, try to return the relevant <source> value
per the network type.
"""
if self.type == self.TYPE_VIRTUAL:
return self._network
if self.type == self.TYPE_BRIDGE:
return self._bridge
if self.type == self.TYPE_DIRECT:
return self._source_dev
if self.type == self.TYPE_USER or self.type == self.TYPE_ETHERNET:
return None
return self._network or self._bridge or self._source_dev
def _set_source(self, newsource):
"""
Convenience function, try to set the relevant <source> value
per the network type
"""
self._bridge = None
self._network = None
self._source_dev = None
if self.type == self.TYPE_VIRTUAL:
self._network = newsource
elif self.type == self.TYPE_BRIDGE:
self._bridge = newsource
elif self.type == self.TYPE_DIRECT:
self._source_dev = newsource
source = property(_get_source, _set_source)
##################
# XML properties #
##################
_XML_PROP_ORDER = [
"_bridge", "_network", "_source_dev", "source_type", "source_path",
"source_mode", "portgroup", "macaddr", "target_dev", "model",
"virtualport", "filterref", "rom_bar", "rom_file", "mtu_size"]
_bridge = XMLProperty("./source/@bridge")
_network = XMLProperty("./source/@network")
_source_dev = XMLProperty("./source/@dev")
virtualport = XMLChildProperty(_VirtualPort, is_single=True)
type = XMLProperty("./@type")
trustGuestRxFilters = XMLProperty("./@trustGuestRxFilters", is_yesno=True)
macaddr = XMLProperty("./mac/@address")
source_type = XMLProperty("./source/@type")
source_path = XMLProperty("./source/@path")
source_mode = XMLProperty("./source/@mode")
portgroup = XMLProperty("./source/@portgroup")
model = XMLProperty("./model/@type")
target_dev = XMLProperty("./target/@dev")
filterref = XMLProperty("./filterref/@filter")
link_state = XMLProperty("./link/@state")
driver_name = XMLProperty("./driver/@name")
driver_queues = XMLProperty("./driver/@queues", is_int=True)
rom_bar = XMLProperty("./rom/@bar", is_onoff=True)
rom_file = XMLProperty("./rom/@file")
mtu_size = XMLProperty("./mtu/@size", is_int=True)
#############
# Build API #
#############
def validate(self):
if not self.macaddr:
return
util.validate_macaddr(self.macaddr)
self.is_conflict_net(self.conn, self.macaddr)
def set_default_source(self):
if (self.conn.is_qemu_session() or self.conn.is_test()):
self.type = self.TYPE_USER
else:
self.type, self.source = _default_network(self.conn)
##################
# Default config #
##################
@staticmethod
def default_model(guest):
if not guest.os.is_hvm():
return None
if guest.supports_virtionet():
return "virtio"
if guest.os.is_q35():
return "e1000e"
if not guest.os.is_x86():
return None
prefs = ["e1000", "rtl8139", "ne2k_pci", "pcnet"]
supported_models = guest.osinfo.supported_netmodels()
for pref in prefs:
if pref in supported_models:
return pref
return "e1000"
def set_defaults(self, guest):
if not self.type:
self.type = self.TYPE_BRIDGE
if not self.macaddr:
self.macaddr = self.generate_mac(self.conn)
if self.type == self.TYPE_BRIDGE and not self._bridge:
self._bridge = _default_bridge(self.conn)
if self.type == self.TYPE_DIRECT and not self.source_mode:
self.source_mode = "vepa"
if not self.model:
self.model = self.default_model(guest)
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