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552 lines
17 KiB
552 lines
17 KiB
#
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# Copyright (c) 2011 Thomas Graf <tgraf@suug.ch>
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#
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"""Module providing access to network links
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This module provides an interface to view configured network links,
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modify them and to add and delete virtual network links.
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The following is a basic example:
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import netlink.core as netlink
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import netlink.route.link as link
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sock = netlink.Socket()
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sock.connect(netlink.NETLINK_ROUTE)
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cache = link.LinkCache() # create new empty link cache
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cache.refill(sock) # fill cache with all configured links
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eth0 = cache['eth0'] # lookup link "eth0"
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print eth0 # print basic configuration
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The module contains the following public classes:
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- Link -- Represents a network link. Instances can be created directly
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via the constructor (empty link objects) or via the refill()
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method of a LinkCache.
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- LinkCache -- Derived from netlink.Cache, holds any number of
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network links (Link instances). Main purpose is to keep
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a local list of all network links configured in the
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kernel.
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The following public functions exist:
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- get_from_kernel(socket, name)
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"""
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from __future__ import absolute_import
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__version__ = '0.1'
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__all__ = [
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'LinkCache',
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'Link',
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'get_from_kernel',
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]
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import socket
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from .. import core as netlink
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from .. import capi as core_capi
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from . import capi as capi
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from .links import inet as inet
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from .. import util as util
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# Link statistics definitions
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RX_PACKETS = 0
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TX_PACKETS = 1
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RX_BYTES = 2
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TX_BYTES = 3
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RX_ERRORS = 4
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TX_ERRORS = 5
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RX_DROPPED = 6
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TX_DROPPED = 7
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RX_COMPRESSED = 8
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TX_COMPRESSED = 9
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RX_FIFO_ERR = 10
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TX_FIFO_ERR = 11
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RX_LEN_ERR = 12
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RX_OVER_ERR = 13
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RX_CRC_ERR = 14
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RX_FRAME_ERR = 15
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RX_MISSED_ERR = 16
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TX_ABORT_ERR = 17
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TX_CARRIER_ERR = 18
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TX_HBEAT_ERR = 19
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TX_WIN_ERR = 20
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COLLISIONS = 21
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MULTICAST = 22
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IP6_INPKTS = 23
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IP6_INHDRERRORS = 24
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IP6_INTOOBIGERRORS = 25
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IP6_INNOROUTES = 26
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IP6_INADDRERRORS = 27
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IP6_INUNKNOWNPROTOS = 28
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IP6_INTRUNCATEDPKTS = 29
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IP6_INDISCARDS = 30
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IP6_INDELIVERS = 31
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IP6_OUTFORWDATAGRAMS = 32
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IP6_OUTPKTS = 33
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IP6_OUTDISCARDS = 34
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IP6_OUTNOROUTES = 35
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IP6_REASMTIMEOUT = 36
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IP6_REASMREQDS = 37
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IP6_REASMOKS = 38
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IP6_REASMFAILS = 39
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IP6_FRAGOKS = 40
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IP6_FRAGFAILS = 41
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IP6_FRAGCREATES = 42
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IP6_INMCASTPKTS = 43
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IP6_OUTMCASTPKTS = 44
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IP6_INBCASTPKTS = 45
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IP6_OUTBCASTPKTS = 46
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IP6_INOCTETS = 47
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IP6_OUTOCTETS = 48
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IP6_INMCASTOCTETS = 49
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IP6_OUTMCASTOCTETS = 50
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IP6_INBCASTOCTETS = 51
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IP6_OUTBCASTOCTETS = 52
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ICMP6_INMSGS = 53
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ICMP6_INERRORS = 54
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ICMP6_OUTMSGS = 55
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ICMP6_OUTERRORS = 56
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class LinkCache(netlink.Cache):
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"""Cache of network links"""
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def __init__(self, family=socket.AF_UNSPEC, cache=None):
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if not cache:
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cache = self._alloc_cache_name('route/link')
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self._info_module = None
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self._protocol = netlink.NETLINK_ROUTE
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self._nl_cache = cache
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self._set_arg1(family)
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def __getitem__(self, key):
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if type(key) is int:
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link = capi.rtnl_link_get(self._nl_cache, key)
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else:
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link = capi.rtnl_link_get_by_name(self._nl_cache, key)
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if link is None:
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raise KeyError()
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else:
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return Link.from_capi(link)
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@staticmethod
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def _new_object(obj):
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return Link(obj)
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def _new_cache(self, cache):
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return LinkCache(family=self.arg1, cache=cache)
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class Link(netlink.Object):
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"""Network link"""
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def __init__(self, obj=None):
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netlink.Object.__init__(self, 'route/link', 'link', obj)
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self._rtnl_link = self._obj2type(self._nl_object)
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if self.type:
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self._module_lookup('netlink.route.links.' + self.type)
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self.inet = inet.InetLink(self)
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self.af = {'inet' : self.inet }
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, tb):
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if exc_type is None:
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self.change()
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else:
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return false
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@classmethod
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def from_capi(cls, obj):
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return cls(capi.link2obj(obj))
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@staticmethod
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def _obj2type(obj):
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return capi.obj2link(obj)
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def __cmp__(self, other):
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return self.ifindex - other.ifindex
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@staticmethod
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def _new_instance(obj):
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if not obj:
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raise ValueError()
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return Link(obj)
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@property
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@netlink.nlattr(type=int, immutable=True, fmt=util.num)
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def ifindex(self):
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"""interface index"""
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return capi.rtnl_link_get_ifindex(self._rtnl_link)
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@ifindex.setter
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def ifindex(self, value):
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capi.rtnl_link_set_ifindex(self._rtnl_link, int(value))
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# ifindex is immutable but we assume that if _orig does not
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# have an ifindex specified, it was meant to be given here
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if capi.rtnl_link_get_ifindex(self._orig) == 0:
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capi.rtnl_link_set_ifindex(self._orig, int(value))
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@property
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@netlink.nlattr(type=str, fmt=util.bold)
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def name(self):
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"""Name of link"""
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return capi.rtnl_link_get_name(self._rtnl_link)
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@name.setter
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def name(self, value):
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capi.rtnl_link_set_name(self._rtnl_link, value)
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# name is the secondary identifier, if _orig does not have
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# the name specified yet, assume it was meant to be specified
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# here. ifindex will always take priority, therefore if ifindex
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# is specified as well, this will be ignored automatically.
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if capi.rtnl_link_get_name(self._orig) is None:
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capi.rtnl_link_set_name(self._orig, value)
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@property
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@netlink.nlattr(type=str, fmt=util.string)
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def flags(self):
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"""Flags
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Setting this property will *Not* reset flags to value you supply in
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Examples:
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link.flags = '+xxx' # add xxx flag
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link.flags = 'xxx' # exactly the same
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link.flags = '-xxx' # remove xxx flag
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link.flags = [ '+xxx', '-yyy' ] # list operation
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"""
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flags = capi.rtnl_link_get_flags(self._rtnl_link)
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return capi.rtnl_link_flags2str(flags, 256)[0].split(',')
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def _set_flag(self, flag):
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if flag.startswith('-'):
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i = capi.rtnl_link_str2flags(flag[1:])
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capi.rtnl_link_unset_flags(self._rtnl_link, i)
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elif flag.startswith('+'):
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i = capi.rtnl_link_str2flags(flag[1:])
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capi.rtnl_link_set_flags(self._rtnl_link, i)
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else:
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i = capi.rtnl_link_str2flags(flag)
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capi.rtnl_link_set_flags(self._rtnl_link, i)
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@flags.setter
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def flags(self, value):
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if not (type(value) is str):
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for flag in value:
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self._set_flag(flag)
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else:
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self._set_flag(value)
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@property
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@netlink.nlattr(type=int, fmt=util.num)
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def mtu(self):
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"""Maximum Transmission Unit"""
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return capi.rtnl_link_get_mtu(self._rtnl_link)
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@mtu.setter
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def mtu(self, value):
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capi.rtnl_link_set_mtu(self._rtnl_link, int(value))
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@property
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@netlink.nlattr(type=int, immutable=True, fmt=util.num)
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def family(self):
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"""Address family"""
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return capi.rtnl_link_get_family(self._rtnl_link)
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@family.setter
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def family(self, value):
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capi.rtnl_link_set_family(self._rtnl_link, value)
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@property
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@netlink.nlattr(type=str, fmt=util.addr)
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def address(self):
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"""Hardware address (MAC address)"""
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a = capi.rtnl_link_get_addr(self._rtnl_link)
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return netlink.AbstractAddress(a)
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@address.setter
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def address(self, value):
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capi.rtnl_link_set_addr(self._rtnl_link, value._addr)
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@property
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@netlink.nlattr(type=str, fmt=util.addr)
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def broadcast(self):
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"""Hardware broadcast address"""
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a = capi.rtnl_link_get_broadcast(self._rtnl_link)
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return netlink.AbstractAddress(a)
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@broadcast.setter
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def broadcast(self, value):
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capi.rtnl_link_set_broadcast(self._rtnl_link, value._addr)
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@property
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@netlink.nlattr(type=str, immutable=True, fmt=util.string)
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def qdisc(self):
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"""Name of qdisc (cannot be changed)"""
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return capi.rtnl_link_get_qdisc(self._rtnl_link)
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@qdisc.setter
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def qdisc(self, value):
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capi.rtnl_link_set_qdisc(self._rtnl_link, value)
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@property
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@netlink.nlattr(type=int, fmt=util.num)
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def txqlen(self):
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"""Length of transmit queue"""
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return capi.rtnl_link_get_txqlen(self._rtnl_link)
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@txqlen.setter
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def txqlen(self, value):
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capi.rtnl_link_set_txqlen(self._rtnl_link, int(value))
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@property
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@netlink.nlattr(type=str, immutable=True, fmt=util.string)
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def arptype(self):
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"""Type of link (cannot be changed)"""
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type_ = capi.rtnl_link_get_arptype(self._rtnl_link)
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return core_capi.nl_llproto2str(type_, 64)[0]
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@arptype.setter
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def arptype(self, value):
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i = core_capi.nl_str2llproto(value)
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capi.rtnl_link_set_arptype(self._rtnl_link, i)
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@property
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@netlink.nlattr(type=str, immutable=True, fmt=util.string, title='state')
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def operstate(self):
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"""Operational status"""
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operstate = capi.rtnl_link_get_operstate(self._rtnl_link)
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return capi.rtnl_link_operstate2str(operstate, 32)[0]
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@operstate.setter
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def operstate(self, value):
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i = capi.rtnl_link_str2operstate(value)
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capi.rtnl_link_set_operstate(self._rtnl_link, i)
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@property
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@netlink.nlattr(type=str, immutable=True, fmt=util.string)
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def mode(self):
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"""Link mode"""
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mode = capi.rtnl_link_get_linkmode(self._rtnl_link)
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return capi.rtnl_link_mode2str(mode, 32)[0]
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@mode.setter
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def mode(self, value):
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i = capi.rtnl_link_str2mode(value)
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capi.rtnl_link_set_linkmode(self._rtnl_link, i)
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@property
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@netlink.nlattr(type=str, fmt=util.string)
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def alias(self):
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"""Interface alias (SNMP)"""
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return capi.rtnl_link_get_ifalias(self._rtnl_link)
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@alias.setter
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def alias(self, value):
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capi.rtnl_link_set_ifalias(self._rtnl_link, value)
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@property
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@netlink.nlattr(type=str, fmt=util.string)
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def type(self):
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"""Link type"""
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return capi.rtnl_link_get_type(self._rtnl_link)
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@type.setter
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def type(self, value):
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if capi.rtnl_link_set_type(self._rtnl_link, value) < 0:
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raise NameError('unknown info type')
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self._module_lookup('netlink.route.links.' + value)
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def get_stat(self, stat):
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"""Retrieve statistical information"""
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if type(stat) is str:
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stat = capi.rtnl_link_str2stat(stat)
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if stat < 0:
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raise NameError('unknown name of statistic')
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return capi.rtnl_link_get_stat(self._rtnl_link, stat)
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def enslave(self, slave, sock=None):
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if not sock:
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sock = netlink.lookup_socket(netlink.NETLINK_ROUTE)
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return capi.rtnl_link_enslave(sock._sock, self._rtnl_link, slave._rtnl_link)
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def release(self, slave, sock=None):
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if not sock:
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sock = netlink.lookup_socket(netlink.NETLINK_ROUTE)
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return capi.rtnl_link_release(sock._sock, self._rtnl_link, slave._rtnl_link)
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def add(self, sock=None, flags=None):
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if not sock:
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sock = netlink.lookup_socket(netlink.NETLINK_ROUTE)
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if not flags:
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flags = netlink.NLM_F_CREATE
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ret = capi.rtnl_link_add(sock._sock, self._rtnl_link, flags)
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if ret < 0:
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raise netlink.KernelError(ret)
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def change(self, sock=None, flags=0):
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"""Commit changes made to the link object"""
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if sock is None:
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sock = netlink.lookup_socket(netlink.NETLINK_ROUTE)
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if not self._orig:
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raise netlink.NetlinkError('Original link not available')
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ret = capi.rtnl_link_change(sock._sock, self._orig, self._rtnl_link, flags)
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if ret < 0:
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raise netlink.KernelError(ret)
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def delete(self, sock=None):
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"""Attempt to delete this link in the kernel"""
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if sock is None:
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sock = netlink.lookup_socket(netlink.NETLINK_ROUTE)
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ret = capi.rtnl_link_delete(sock._sock, self._rtnl_link)
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if ret < 0:
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raise netlink.KernelError(ret)
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###################################################################
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# private properties
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#
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# Used for formatting output. USE AT OWN RISK
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@property
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def _state(self):
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if 'up' in self.flags:
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buf = util.good('up')
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if 'lowerup' not in self.flags:
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buf += ' ' + util.bad('no-carrier')
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else:
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buf = util.bad('down')
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return buf
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@property
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def _brief(self):
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return self._module_brief() + self._foreach_af('brief')
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@property
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def _flags(self):
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ignore = [
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'up',
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'running',
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'lowerup',
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]
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return ','.join([flag for flag in self.flags if flag not in ignore])
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def _foreach_af(self, name, args=None):
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buf = ''
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for af in self.af:
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try:
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func = getattr(self.af[af], name)
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s = str(func(args))
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if len(s) > 0:
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buf += ' ' + s
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except AttributeError:
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pass
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return buf
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def format(self, details=False, stats=False, indent=''):
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"""Return link as formatted text"""
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fmt = util.MyFormatter(self, indent)
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buf = fmt.format('{a|ifindex} {a|name} {a|arptype} {a|address} '\
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'{a|_state} <{a|_flags}> {a|_brief}')
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if details:
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buf += fmt.nl('\t{t|mtu} {t|txqlen} {t|weight} '\
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'{t|qdisc} {t|operstate}')
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buf += fmt.nl('\t{t|broadcast} {t|alias}')
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buf += self._foreach_af('details', fmt)
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if stats:
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l = [['Packets', RX_PACKETS, TX_PACKETS],
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['Bytes', RX_BYTES, TX_BYTES],
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['Errors', RX_ERRORS, TX_ERRORS],
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['Dropped', RX_DROPPED, TX_DROPPED],
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['Compressed', RX_COMPRESSED, TX_COMPRESSED],
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['FIFO Errors', RX_FIFO_ERR, TX_FIFO_ERR],
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['Length Errors', RX_LEN_ERR, None],
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['Over Errors', RX_OVER_ERR, None],
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['CRC Errors', RX_CRC_ERR, None],
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['Frame Errors', RX_FRAME_ERR, None],
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['Missed Errors', RX_MISSED_ERR, None],
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['Abort Errors', None, TX_ABORT_ERR],
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['Carrier Errors', None, TX_CARRIER_ERR],
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['Heartbeat Errors', None, TX_HBEAT_ERR],
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['Window Errors', None, TX_WIN_ERR],
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['Collisions', None, COLLISIONS],
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['Multicast', None, MULTICAST],
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['', None, None],
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['Ipv6:', None, None],
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['Packets', IP6_INPKTS, IP6_OUTPKTS],
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['Bytes', IP6_INOCTETS, IP6_OUTOCTETS],
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['Discards', IP6_INDISCARDS, IP6_OUTDISCARDS],
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['Multicast Packets', IP6_INMCASTPKTS, IP6_OUTMCASTPKTS],
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['Multicast Bytes', IP6_INMCASTOCTETS, IP6_OUTMCASTOCTETS],
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['Broadcast Packets', IP6_INBCASTPKTS, IP6_OUTBCASTPKTS],
|
|
['Broadcast Bytes', IP6_INBCASTOCTETS, IP6_OUTBCASTOCTETS],
|
|
['Delivers', IP6_INDELIVERS, None],
|
|
['Forwarded', None, IP6_OUTFORWDATAGRAMS],
|
|
['No Routes', IP6_INNOROUTES, IP6_OUTNOROUTES],
|
|
['Header Errors', IP6_INHDRERRORS, None],
|
|
['Too Big Errors', IP6_INTOOBIGERRORS, None],
|
|
['Address Errors', IP6_INADDRERRORS, None],
|
|
['Unknown Protocol', IP6_INUNKNOWNPROTOS, None],
|
|
['Truncated Packets', IP6_INTRUNCATEDPKTS, None],
|
|
['Reasm Timeouts', IP6_REASMTIMEOUT, None],
|
|
['Reasm Requests', IP6_REASMREQDS, None],
|
|
['Reasm Failures', IP6_REASMFAILS, None],
|
|
['Reasm OK', IP6_REASMOKS, None],
|
|
['Frag Created', None, IP6_FRAGCREATES],
|
|
['Frag Failures', None, IP6_FRAGFAILS],
|
|
['Frag OK', None, IP6_FRAGOKS],
|
|
['', None, None],
|
|
['ICMPv6:', None, None],
|
|
['Messages', ICMP6_INMSGS, ICMP6_OUTMSGS],
|
|
['Errors', ICMP6_INERRORS, ICMP6_OUTERRORS]]
|
|
|
|
buf += '\n\t%s%s%s%s\n' % (33 * ' ', util.title('RX'),
|
|
15 * ' ', util.title('TX'))
|
|
|
|
for row in l:
|
|
row[0] = util.kw(row[0])
|
|
row[1] = self.get_stat(row[1]) if row[1] else ''
|
|
row[2] = self.get_stat(row[2]) if row[2] else ''
|
|
buf += '\t{0[0]:27} {0[1]:>16} {0[2]:>16}\n'.format(row)
|
|
|
|
buf += self._foreach_af('stats')
|
|
|
|
return buf
|
|
|
|
def get(name, sock=None):
|
|
"""Lookup Link object directly from kernel"""
|
|
if not name:
|
|
raise ValueError()
|
|
|
|
if not sock:
|
|
sock = netlink.lookup_socket(netlink.NETLINK_ROUTE)
|
|
|
|
link = capi.get_from_kernel(sock._sock, 0, name)
|
|
if not link:
|
|
return None
|
|
|
|
return Link.from_capi(link)
|
|
|
|
_link_cache = LinkCache()
|
|
|
|
def resolve(name):
|
|
_link_cache.refill()
|
|
return _link_cache[name]
|