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#============================================================================
# This library is free software; you can redistribute it and/or
# modify it under the terms of version 2.1 of the GNU Lesser General Public
# License as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#============================================================================
# Copyright (C) 2004, 2005 Mike Wray <mike.wray@hp.com>
# Copyright (C) 2005 XenSource Ltd
#============================================================================
"""Support for virtual network interfaces.
"""
import os
import random
import re
from xen.xend import sxp
from xen.xend import XendRoot
from xen.xend.server.DevController import DevController
xroot = XendRoot.instance()
def randomMAC():
"""Generate a random MAC address.
Uses OUI (Organizationally Unique Identifier) 00-16-3E, allocated to
Xensource, Inc. The OUI list is available at
http://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
"""
mac = [ 0x00, 0x16, 0x3e,
random.randint(0x00, 0x7f),
random.randint(0x00, 0xff),
random.randint(0x00, 0xff) ]
return ':'.join(map(lambda x: "%02x" % x, mac))
rate_re = re.compile("^([0-9]+)([GMK]?)([Bb])/s(@([0-9]+)([mu]?)s)?$")
def parseRate(ratestr):
"""if parsing fails this will return default of unlimited rate"""
bytes_per_interval = 0xffffffffL # 0xffffffff # big default
interval_usecs = 0L # disabled
m = rate_re.match(ratestr)
if m:
bytes_per_sec = long(m.group(1))
if m.group(2) == 'G':
bytes_per_sec *= 1000 * 1000 * 1000
elif m.group(2) == 'M':
bytes_per_sec *= 1000 * 1000
elif m.group(2) == 'K':
bytes_per_sec *= 1000
if m.group(3) == 'b':
bytes_per_sec /= 8
if m.group(5) is None:
interval_usecs = 50000L # 50ms default
else:
interval_usecs = long(m.group(5))
if m.group(6) == '':
interval_usecs *= 1000 * 1000
elif m.group(6) == 'm':
interval_usecs *= 1000
bytes_per_interval = (bytes_per_sec * interval_usecs) / 1000000L
# overflow / underflow checking: default to unlimited rate
if bytes_per_interval == 0 or bytes_per_interval > 0xffffffffL or \
interval_usecs == 0 or interval_usecs > 0xffffffffL:
bytes_per_interval = 0xffffffffL
interval_usecs = 0L
return "%lu,%lu" % (bytes_per_interval, interval_usecs)
write_rate_G_re = re.compile('^([0-9]+)000000000(B/s@[0-9]+us)$')
write_rate_M_re = re.compile('^([0-9]+)000000(B/s@[0-9]+us)$')
write_rate_K_re = re.compile('^([0-9]+)000(B/s@[0-9]+us)$')
write_rate_s_re = re.compile('^([0-9]+[GMK]?B/s@[0-9]+)000000us$')
write_rate_m_re = re.compile('^([0-9]+[GMK]?B/s@[0-9]+)000us$')
def formatRate(rate):
(bytes_per_interval, interval_usecs) = map(long, rate.split(','))
if interval_usecs != 0:
bytes_per_second = (bytes_per_interval * 1000 * 1000) / interval_usecs
else:
bytes_per_second = 0xffffffffL
ratestr = "%uB/s@%uus" % (bytes_per_second, interval_usecs)
# look for '000's
m = write_rate_G_re.match(ratestr)
if m:
ratestr = m.group(1) + "G" + m.group(2)
else:
m = write_rate_M_re.match(ratestr)
if m:
ratestr = m.group(1) + "M" + m.group(2)
else:
m = write_rate_K_re.match(ratestr)
if m:
ratestr = m.group(1) + "K" + m.group(2)
m = write_rate_s_re.match(ratestr)
if m:
ratestr = m.group(1) + "s"
else:
m = write_rate_m_re.match(ratestr)
if m:
ratestr = m.group(1) + "ms"
return ratestr
class NetifController(DevController):
"""Network interface controller. Handles all network devices for a domain.
"""
def __init__(self, vm):
DevController.__init__(self, vm)
def getDeviceDetails(self, config):
"""@see DevController.getDeviceDetails"""
def _get_config_ipaddr(config):
val = []
for ipaddr in sxp.children(config, elt='ip'):
val.append(sxp.child0(ipaddr))
return val
script = os.path.join(xroot.network_script_dir,
sxp.child_value(config, 'script',
xroot.get_vif_script()))
typ = sxp.child_value(config, 'type')
bridge = sxp.child_value(config, 'bridge')
mac = sxp.child_value(config, 'mac')
vifname = sxp.child_value(config, 'vifname')
rate = sxp.child_value(config, 'rate')
ipaddr = _get_config_ipaddr(config)
devid = self.allocateDeviceID()
if not mac:
mac = randomMAC()
back = { 'script' : script,
'mac' : mac,
'handle' : "%i" % devid }
if typ == 'ioemu':
front = {}
back['type'] = 'ioemu'
else:
front = { 'handle' : "%i" % devid,
'mac' : mac }
if ipaddr:
back['ip'] = ' '.join(ipaddr)
if bridge:
back['bridge'] = bridge
if vifname:
back['vifname'] = vifname
if rate:
back['rate'] = parseRate(rate)
return (devid, back, front)
def configuration(self, devid):
"""@see DevController.configuration"""
result = DevController.configuration(self, devid)
(script, ip, bridge, mac, typ, vifname, rate) = self.readBackend(
devid, 'script', 'ip', 'bridge', 'mac', 'type', 'vifname', 'rate')
if script:
result.append(['script',
script.replace(xroot.network_script_dir + os.sep,
"")])
if ip:
for i in ip.split(" "):
result.append(['ip', i])
if bridge:
result.append(['bridge', bridge])
if mac:
result.append(['mac', mac])
if typ:
result.append(['type', typ])
if vifname:
result.append(['vifname', vifname])
if rate:
result.append(['rate', formatRate(rate)])
return result
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