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import socket, struct
import netlink
qdisc_kinds = {}
TC_H_ROOT = 0xFFFFFFFF
class QdiscException(Exception): pass
class request(object):
"qdisc request message"
def __init__(self, cmd, flags=0, dev=None, handle=0):
self.n = netlink.nlmsg()
self.t = netlink.tcmsg()
self.n.nlmsg_flags = netlink.NLM_F_REQUEST|flags
self.n.nlmsg_type = cmd
self.t.tcm_family = socket.AF_UNSPEC
if not handle:
handle = TC_H_ROOT
self.t.tcm_parent = handle
if dev:
self.t.tcm_ifindex = dev
def pack(self):
t = self.t.pack()
self.n.body = t
return self.n.pack()
class addrequest(request):
def __init__(self, dev, handle, qdisc):
flags = netlink.NLM_F_EXCL|netlink.NLM_F_CREATE
super(addrequest, self).__init__(netlink.RTM_NEWQDISC, flags=flags,
dev=dev, handle=handle)
self.n.addattr(netlink.TCA_KIND, qdisc.kind + '\0')
opts = qdisc.pack()
if opts:
self.n.addattr(netlink.TCA_OPTIONS, opts)
class delrequest(request):
def __init__(self, dev, handle):
super(delrequest, self).__init__(netlink.RTM_DELQDISC, dev=dev,
handle=handle)
class changerequest(request):
def __init__(self, dev, handle, qdisc):
super(changerequest, self).__init__(netlink.RTM_NEWQDISC,
dev=dev, handle=handle)
self.n.addattr(netlink.TCA_KIND, qdisc.kind + '\0')
opts = qdisc.pack()
if opts:
self.n.addattr(netlink.TCA_OPTIONS, opts)
class Qdisc(object):
def __new__(cls, qdict=None, *args, **opts):
if qdict:
kind = qdict.get('kind')
cls = qdisc_kinds.get(kind, cls)
obj = super(Qdisc, cls).__new__(cls)
return obj
def __init__(self, qdict):
self._qdict = qdict
self.kind = qdict['kind']
self.handle = qdict['handle'] >> 16
def parse(self, opts):
if opts:
raise QdiscException('cannot parse qdisc parameters')
def optstr(self):
if self.qdict['options']:
return '[cannot parse qdisc parameters]'
else:
return ''
def pack(self):
return ''
TC_PRIO_MAX = 15
class PrioQdisc(Qdisc):
fmt = 'i%sB' % (TC_PRIO_MAX + 1)
def __init__(self, qdict):
super(PrioQdisc, self).__init__(qdict)
if qdict.get('options'):
self.unpack(qdict['options'])
else:
self.bands = 3
self.priomap = [1, 2, 2, 2, 1, 2, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1]
def pack(self):
#return struct.pack(self.fmt, self.bands, *self.priomap)
return ''
def unpack(self, opts):
args = struct.unpack(self.fmt, opts)
self.bands = args[0]
self.priomap = args[1:]
def optstr(self):
mapstr = ' '.join([str(p) for p in self.priomap])
return 'bands %d priomap %s' % (self.bands, mapstr)
qdisc_kinds['prio'] = PrioQdisc
qdisc_kinds['pfifo_fast'] = PrioQdisc
class CfifoQdisc(Qdisc):
fmt = 'II'
def __init__(self, qdict):
super(CfifoQdisc, self).__init__(qdict)
if qdict.get('options'):
self.unpack(qdict['options'])
else:
self.epoch = 0
self.vmid = 0
def pack(self):
return struct.pack(self.fmt, self.epoch, self.vmid)
def unpack(self, opts):
self.epoch, self.vmid = struct.unpack(self.fmt, opts)
def parse(self, opts):
args = list(opts)
try:
while args:
arg = args.pop(0)
if arg == 'epoch':
self.epoch = int(args.pop(0))
continue
if arg.lower() == 'vmid':
self.vmid = int(args.pop(0))
continue
except Exception, inst:
raise QdiscException(str(inst))
def optstr(self):
return 'epoch %d vmID %d' % (self.epoch, self.vmid)
qdisc_kinds['cfifo'] = CfifoQdisc
TC_PLUG_CHECKPOINT = 0
TC_PLUG_RELEASE = 1
class PlugQdisc(Qdisc):
fmt = 'I'
def __init__(self, qdict=None):
if not qdict:
qdict = {'kind': 'plug',
'handle': TC_H_ROOT}
super(PlugQdisc, self).__init__(qdict)
self.action = 0
def pack(self):
return struct.pack(self.fmt, self.action)
def parse(self, args):
if not args:
raise QdiscException('no action given')
arg = args[0]
if arg == 'checkpoint':
self.action = TC_PLUG_CHECKPOINT
elif arg == 'release':
self.action = TC_PLUG_RELEASE
else:
raise QdiscException('unknown action')
qdisc_kinds['plug'] = PlugQdisc
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