544 lines
18 KiB
Python
544 lines
18 KiB
Python
#!/usr/bin/python
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#
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# Copyright 2014 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Partial Python implementation of iproute functionality."""
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# pylint: disable=g-bad-todo
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import errno
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import socket
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import struct
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import cstruct
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import netlink
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### Base netlink constants. See include/uapi/linux/netlink.h.
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NETLINK_ROUTE = 0
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# Data structure formats.
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# These aren't constants, they're classes. So, pylint: disable=invalid-name
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NLMsgHdr = cstruct.Struct("NLMsgHdr", "=LHHLL", "length type flags seq pid")
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NLMsgErr = cstruct.Struct("NLMsgErr", "=i", "error")
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NLAttr = cstruct.Struct("NLAttr", "=HH", "nla_len nla_type")
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# Alignment / padding.
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NLA_ALIGNTO = 4
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### rtnetlink constants. See include/uapi/linux/rtnetlink.h.
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# Message types.
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RTM_NEWLINK = 16
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RTM_DELLINK = 17
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RTM_GETLINK = 18
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RTM_NEWADDR = 20
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RTM_DELADDR = 21
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RTM_GETADDR = 22
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RTM_NEWROUTE = 24
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RTM_DELROUTE = 25
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RTM_GETROUTE = 26
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RTM_NEWNEIGH = 28
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RTM_DELNEIGH = 29
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RTM_GETNEIGH = 30
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RTM_NEWRULE = 32
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RTM_DELRULE = 33
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RTM_GETRULE = 34
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# Routing message type values (rtm_type).
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RTN_UNSPEC = 0
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RTN_UNICAST = 1
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RTN_UNREACHABLE = 7
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# Routing protocol values (rtm_protocol).
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RTPROT_UNSPEC = 0
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RTPROT_BOOT = 3
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RTPROT_STATIC = 4
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RTPROT_RA = 9
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# Route scope values (rtm_scope).
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RT_SCOPE_UNIVERSE = 0
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RT_SCOPE_LINK = 253
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# Named routing tables.
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RT_TABLE_UNSPEC = 0
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# Routing attributes.
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RTA_DST = 1
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RTA_SRC = 2
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RTA_OIF = 4
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RTA_GATEWAY = 5
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RTA_PRIORITY = 6
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RTA_PREFSRC = 7
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RTA_METRICS = 8
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RTA_CACHEINFO = 12
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RTA_TABLE = 15
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RTA_MARK = 16
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RTA_PREF = 20
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RTA_UID = 25
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# Route metric attributes.
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RTAX_MTU = 2
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RTAX_HOPLIMIT = 10
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# Data structure formats.
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IfinfoMsg = cstruct.Struct(
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"IfinfoMsg", "=BBHiII", "family pad type index flags change")
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RTMsg = cstruct.Struct(
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"RTMsg", "=BBBBBBBBI",
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"family dst_len src_len tos table protocol scope type flags")
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RTACacheinfo = cstruct.Struct(
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"RTACacheinfo", "=IIiiI", "clntref lastuse expires error used")
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### Interface address constants. See include/uapi/linux/if_addr.h.
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# Interface address attributes.
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IFA_ADDRESS = 1
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IFA_LOCAL = 2
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IFA_LABEL = 3
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IFA_CACHEINFO = 6
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# Address flags.
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IFA_F_SECONDARY = 0x01
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IFA_F_TEMPORARY = IFA_F_SECONDARY
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IFA_F_NODAD = 0x02
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IFA_F_OPTIMISTIC = 0x04
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IFA_F_DADFAILED = 0x08
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IFA_F_HOMEADDRESS = 0x10
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IFA_F_DEPRECATED = 0x20
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IFA_F_TENTATIVE = 0x40
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IFA_F_PERMANENT = 0x80
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# Data structure formats.
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IfAddrMsg = cstruct.Struct(
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"IfAddrMsg", "=BBBBI",
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"family prefixlen flags scope index")
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IFACacheinfo = cstruct.Struct(
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"IFACacheinfo", "=IIII", "prefered valid cstamp tstamp")
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NDACacheinfo = cstruct.Struct(
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"NDACacheinfo", "=IIII", "confirmed used updated refcnt")
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### Neighbour table entry constants. See include/uapi/linux/neighbour.h.
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# Neighbour cache entry attributes.
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NDA_DST = 1
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NDA_LLADDR = 2
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NDA_CACHEINFO = 3
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NDA_PROBES = 4
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# Neighbour cache entry states.
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NUD_PERMANENT = 0x80
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# Data structure formats.
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NdMsg = cstruct.Struct(
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"NdMsg", "=BxxxiHBB",
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"family ifindex state flags type")
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### FIB rule constants. See include/uapi/linux/fib_rules.h.
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FRA_IIFNAME = 3
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FRA_PRIORITY = 6
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FRA_FWMARK = 10
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FRA_SUPPRESS_PREFIXLEN = 14
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FRA_TABLE = 15
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FRA_FWMASK = 16
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FRA_OIFNAME = 17
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FRA_UID_RANGE = 20
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# Data structure formats.
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FibRuleUidRange = cstruct.Struct("FibRuleUidRange", "=II", "start end")
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# Link constants. See include/uapi/linux/if_link.h.
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IFLA_ADDRESS = 1
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IFLA_BROADCAST = 2
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IFLA_IFNAME = 3
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IFLA_MTU = 4
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IFLA_QDISC = 6
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IFLA_STATS = 7
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IFLA_TXQLEN = 13
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IFLA_MAP = 14
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IFLA_OPERSTATE = 16
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IFLA_LINKMODE = 17
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IFLA_STATS64 = 23
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IFLA_AF_SPEC = 26
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IFLA_GROUP = 27
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IFLA_EXT_MASK = 29
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IFLA_PROMISCUITY = 30
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IFLA_NUM_TX_QUEUES = 31
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IFLA_NUM_RX_QUEUES = 32
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IFLA_CARRIER = 33
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def CommandVerb(command):
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return ["NEW", "DEL", "GET", "SET"][command % 4]
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def CommandSubject(command):
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return ["LINK", "ADDR", "ROUTE", "NEIGH", "RULE"][(command - 16) / 4]
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def CommandName(command):
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try:
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return "RTM_%s%s" % (CommandVerb(command), CommandSubject(command))
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except IndexError:
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return "RTM_%d" % command
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class IPRoute(netlink.NetlinkSocket):
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"""Provides a tiny subset of iproute functionality."""
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FAMILY = NETLINK_ROUTE
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def _NlAttrIPAddress(self, nla_type, family, address):
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return self._NlAttr(nla_type, socket.inet_pton(family, address))
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def _NlAttrInterfaceName(self, nla_type, interface):
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return self._NlAttr(nla_type, interface + "\x00")
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def _GetConstantName(self, value, prefix):
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return super(IPRoute, self)._GetConstantName(__name__, value, prefix)
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def _Decode(self, command, msg, nla_type, nla_data):
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"""Decodes netlink attributes to Python types.
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Values for which the code knows the type (e.g., the fwmark ID in a
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RTM_NEWRULE command) are decoded to Python integers, strings, etc. Values
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of unknown type are returned as raw byte strings.
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Args:
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command: An integer.
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- If positive, the number of the rtnetlink command being carried out.
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This is used to interpret the attributes. For example, for an
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RTM_NEWROUTE command, attribute type 3 is the incoming interface and
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is an integer, but for a RTM_NEWRULE command, attribute type 3 is the
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incoming interface name and is a string.
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- If negative, one of the following (negative) values:
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- RTA_METRICS: Interpret as nested route metrics.
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family: The address family. Used to convert IP addresses into strings.
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nla_type: An integer, then netlink attribute type.
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nla_data: A byte string, the netlink attribute data.
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Returns:
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A tuple (name, data):
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- name is a string (e.g., "FRA_PRIORITY") if we understood the attribute,
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or an integer if we didn't.
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- data can be an integer, a string, a nested dict of attributes as
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returned by _ParseAttributes (e.g., for RTA_METRICS), a cstruct.Struct
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(e.g., RTACacheinfo), etc. If we didn't understand the attribute, it
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will be the raw byte string.
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"""
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if command == -RTA_METRICS:
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name = self._GetConstantName(nla_type, "RTAX_")
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elif CommandSubject(command) == "ADDR":
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name = self._GetConstantName(nla_type, "IFA_")
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elif CommandSubject(command) == "LINK":
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name = self._GetConstantName(nla_type, "IFLA_")
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elif CommandSubject(command) == "RULE":
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name = self._GetConstantName(nla_type, "FRA_")
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elif CommandSubject(command) == "ROUTE":
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name = self._GetConstantName(nla_type, "RTA_")
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elif CommandSubject(command) == "NEIGH":
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name = self._GetConstantName(nla_type, "NDA_")
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else:
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# Don't know what this is. Leave it as an integer.
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name = nla_type
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if name in ["FRA_PRIORITY", "FRA_FWMARK", "FRA_TABLE", "FRA_FWMASK",
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"RTA_OIF", "RTA_PRIORITY", "RTA_TABLE", "RTA_MARK",
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"IFLA_MTU", "IFLA_TXQLEN", "IFLA_GROUP", "IFLA_EXT_MASK",
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"IFLA_PROMISCUITY", "IFLA_NUM_RX_QUEUES",
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"IFLA_NUM_TX_QUEUES", "NDA_PROBES", "RTAX_MTU",
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"RTAX_HOPLIMIT"]:
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data = struct.unpack("=I", nla_data)[0]
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elif name == "FRA_SUPPRESS_PREFIXLEN":
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data = struct.unpack("=i", nla_data)[0]
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elif name in ["IFLA_LINKMODE", "IFLA_OPERSTATE", "IFLA_CARRIER"]:
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data = ord(nla_data)
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elif name in ["IFA_ADDRESS", "IFA_LOCAL", "RTA_DST", "RTA_SRC",
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"RTA_GATEWAY", "RTA_PREFSRC", "RTA_UID",
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"NDA_DST"]:
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data = socket.inet_ntop(msg.family, nla_data)
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elif name in ["FRA_IIFNAME", "FRA_OIFNAME", "IFLA_IFNAME", "IFLA_QDISC",
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"IFA_LABEL"]:
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data = nla_data.strip("\x00")
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elif name == "RTA_METRICS":
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data = self._ParseAttributes(-RTA_METRICS, None, nla_data)
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elif name == "RTA_CACHEINFO":
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data = RTACacheinfo(nla_data)
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elif name == "IFA_CACHEINFO":
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data = IFACacheinfo(nla_data)
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elif name == "NDA_CACHEINFO":
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data = NDACacheinfo(nla_data)
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elif name in ["NDA_LLADDR", "IFLA_ADDRESS"]:
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data = ":".join(x.encode("hex") for x in nla_data)
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elif name == "FRA_UID_RANGE":
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data = FibRuleUidRange(nla_data)
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else:
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data = nla_data
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return name, data
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def __init__(self):
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super(IPRoute, self).__init__()
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def _AddressFamily(self, version):
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return {4: socket.AF_INET, 6: socket.AF_INET6}[version]
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def _SendNlRequest(self, command, data, flags=0):
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"""Sends a netlink request and expects an ack."""
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flags |= netlink.NLM_F_REQUEST
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if CommandVerb(command) != "GET":
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flags |= netlink.NLM_F_ACK
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if CommandVerb(command) == "NEW":
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if not flags & netlink.NLM_F_REPLACE:
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flags |= (netlink.NLM_F_EXCL | netlink.NLM_F_CREATE)
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super(IPRoute, self)._SendNlRequest(command, data, flags)
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def _Rule(self, version, is_add, rule_type, table, match_nlattr, priority):
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"""Python equivalent of "ip rule <add|del> <match_cond> lookup <table>".
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Args:
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version: An integer, 4 or 6.
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is_add: True to add a rule, False to delete it.
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rule_type: Type of rule, e.g., RTN_UNICAST or RTN_UNREACHABLE.
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table: If nonzero, rule looks up this table.
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match_nlattr: A blob of struct nlattrs that express the match condition.
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If None, match everything.
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priority: An integer, the priority.
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Raises:
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IOError: If the netlink request returns an error.
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ValueError: If the kernel's response could not be parsed.
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"""
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# Create a struct rtmsg specifying the table and the given match attributes.
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family = self._AddressFamily(version)
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rtmsg = RTMsg((family, 0, 0, 0, RT_TABLE_UNSPEC,
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RTPROT_STATIC, RT_SCOPE_UNIVERSE, rule_type, 0)).Pack()
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rtmsg += self._NlAttrU32(FRA_PRIORITY, priority)
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if match_nlattr:
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rtmsg += match_nlattr
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if table:
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rtmsg += self._NlAttrU32(FRA_TABLE, table)
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# Create a netlink request containing the rtmsg.
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command = RTM_NEWRULE if is_add else RTM_DELRULE
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self._SendNlRequest(command, rtmsg)
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def DeleteRulesAtPriority(self, version, priority):
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family = self._AddressFamily(version)
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rtmsg = RTMsg((family, 0, 0, 0, RT_TABLE_UNSPEC,
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RTPROT_STATIC, RT_SCOPE_UNIVERSE, RTN_UNICAST, 0)).Pack()
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rtmsg += self._NlAttrU32(FRA_PRIORITY, priority)
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while True:
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try:
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self._SendNlRequest(RTM_DELRULE, rtmsg)
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except IOError, e:
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if e.errno == -errno.ENOENT:
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break
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else:
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raise
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def FwmarkRule(self, version, is_add, fwmark, table, priority):
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nlattr = self._NlAttrU32(FRA_FWMARK, fwmark)
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return self._Rule(version, is_add, RTN_UNICAST, table, nlattr, priority)
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def IifRule(self, version, is_add, iif, table, priority):
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nlattr = self._NlAttrInterfaceName(FRA_IIFNAME, iif)
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return self._Rule(version, is_add, RTN_UNICAST, table, nlattr, priority)
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def OifRule(self, version, is_add, oif, table, priority):
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nlattr = self._NlAttrInterfaceName(FRA_OIFNAME, oif)
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return self._Rule(version, is_add, RTN_UNICAST, table, nlattr, priority)
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def UidRangeRule(self, version, is_add, start, end, table, priority):
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nlattr = self._NlAttrInterfaceName(FRA_IIFNAME, "lo")
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nlattr += self._NlAttr(FRA_UID_RANGE,
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FibRuleUidRange((start, end)).Pack())
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return self._Rule(version, is_add, RTN_UNICAST, table, nlattr, priority)
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def UnreachableRule(self, version, is_add, priority):
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return self._Rule(version, is_add, RTN_UNREACHABLE, None, None, priority)
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def DefaultRule(self, version, is_add, table, priority):
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return self.FwmarkRule(version, is_add, 0, table, priority)
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def CommandToString(self, command, data):
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try:
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name = CommandName(command)
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subject = CommandSubject(command)
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struct_type = {
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"ADDR": IfAddrMsg,
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"LINK": IfinfoMsg,
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"NEIGH": NdMsg,
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"ROUTE": RTMsg,
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"RULE": RTMsg,
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}[subject]
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parsed = self._ParseNLMsg(data, struct_type)
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return "%s %s" % (name, str(parsed))
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except IndexError:
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raise ValueError("Don't know how to print command type %s" % name)
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def MaybeDebugCommand(self, command, unused_flags, data):
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subject = CommandSubject(command)
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if "ALL" not in self.NL_DEBUG and subject not in self.NL_DEBUG:
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return
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print self.CommandToString(command, data)
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def MaybeDebugMessage(self, message):
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hdr = NLMsgHdr(message)
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self.MaybeDebugCommand(hdr.type, message)
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def PrintMessage(self, message):
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hdr = NLMsgHdr(message)
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print self.CommandToString(hdr.type, message)
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def DumpRules(self, version):
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"""Returns the IP rules for the specified IP version."""
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# Create a struct rtmsg specifying the table and the given match attributes.
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family = self._AddressFamily(version)
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rtmsg = RTMsg((family, 0, 0, 0, 0, 0, 0, 0, 0))
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return self._Dump(RTM_GETRULE, rtmsg, RTMsg, "")
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def DumpLinks(self):
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ifinfomsg = IfinfoMsg((0, 0, 0, 0, 0, 0))
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return self._Dump(RTM_GETLINK, ifinfomsg, IfinfoMsg, "")
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def DumpAddresses(self, version):
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family = self._AddressFamily(version)
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ifaddrmsg = IfAddrMsg((family, 0, 0, 0, 0))
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return self._Dump(RTM_GETADDR, ifaddrmsg, IfAddrMsg, "")
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def _Address(self, version, command, addr, prefixlen, flags, scope, ifindex):
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"""Adds or deletes an IP address."""
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family = self._AddressFamily(version)
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ifaddrmsg = IfAddrMsg((family, prefixlen, flags, scope, ifindex)).Pack()
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ifaddrmsg += self._NlAttrIPAddress(IFA_ADDRESS, family, addr)
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if version == 4:
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ifaddrmsg += self._NlAttrIPAddress(IFA_LOCAL, family, addr)
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self._SendNlRequest(command, ifaddrmsg)
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def AddAddress(self, address, prefixlen, ifindex):
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self._Address(6 if ":" in address else 4,
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RTM_NEWADDR, address, prefixlen,
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IFA_F_PERMANENT, RT_SCOPE_UNIVERSE, ifindex)
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def DelAddress(self, address, prefixlen, ifindex):
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self._Address(6 if ":" in address else 4,
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RTM_DELADDR, address, prefixlen, 0, 0, ifindex)
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def GetAddress(self, address, ifindex=0):
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"""Returns an ifaddrmsg for the requested address."""
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if ":" not in address:
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# The address is likely an IPv4 address. RTM_GETADDR without the
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# NLM_F_DUMP flag is not supported by the kernel. We do not currently
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# implement parsing dump results.
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raise NotImplementedError("IPv4 RTM_GETADDR not implemented.")
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self._Address(6, RTM_GETADDR, address, 0, 0, RT_SCOPE_UNIVERSE, ifindex)
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return self._GetMsg(IfAddrMsg)
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def _Route(self, version, proto, command, table, dest, prefixlen, nexthop,
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dev, mark, uid):
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"""Adds, deletes, or queries a route."""
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family = self._AddressFamily(version)
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scope = RT_SCOPE_UNIVERSE if nexthop else RT_SCOPE_LINK
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rtmsg = RTMsg((family, prefixlen, 0, 0, RT_TABLE_UNSPEC,
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proto, scope, RTN_UNICAST, 0)).Pack()
|
|
if command == RTM_NEWROUTE and not table:
|
|
# Don't allow setting routes in table 0, since its behaviour is confusing
|
|
# and differs between IPv4 and IPv6.
|
|
raise ValueError("Cowardly refusing to add a route to table 0")
|
|
if table:
|
|
rtmsg += self._NlAttrU32(FRA_TABLE, table)
|
|
if dest != "default": # The default is the default route.
|
|
rtmsg += self._NlAttrIPAddress(RTA_DST, family, dest)
|
|
if nexthop:
|
|
rtmsg += self._NlAttrIPAddress(RTA_GATEWAY, family, nexthop)
|
|
if dev:
|
|
rtmsg += self._NlAttrU32(RTA_OIF, dev)
|
|
if mark is not None:
|
|
rtmsg += self._NlAttrU32(RTA_MARK, mark)
|
|
if uid is not None:
|
|
rtmsg += self._NlAttrU32(RTA_UID, uid)
|
|
self._SendNlRequest(command, rtmsg)
|
|
|
|
def AddRoute(self, version, table, dest, prefixlen, nexthop, dev):
|
|
self._Route(version, RTPROT_STATIC, RTM_NEWROUTE, table, dest, prefixlen,
|
|
nexthop, dev, None, None)
|
|
|
|
def DelRoute(self, version, table, dest, prefixlen, nexthop, dev):
|
|
self._Route(version, RTPROT_STATIC, RTM_DELROUTE, table, dest, prefixlen,
|
|
nexthop, dev, None, None)
|
|
|
|
def GetRoutes(self, dest, oif, mark, uid):
|
|
version = 6 if ":" in dest else 4
|
|
prefixlen = {4: 32, 6: 128}[version]
|
|
self._Route(version, RTPROT_STATIC, RTM_GETROUTE, 0, dest, prefixlen, None,
|
|
oif, mark, uid)
|
|
data = self._Recv()
|
|
# The response will either be an error or a list of routes.
|
|
if NLMsgHdr(data).type == netlink.NLMSG_ERROR:
|
|
self._ParseAck(data)
|
|
routes = self._GetMsgList(RTMsg, data, False)
|
|
return routes
|
|
|
|
def DumpRoutes(self, version, ifindex):
|
|
ndmsg = NdMsg((self._AddressFamily(version), 0, 0, 0, 0))
|
|
return [(m, r) for (m, r) in self._Dump(RTM_GETROUTE, ndmsg, NdMsg, "")
|
|
if r['RTA_TABLE'] == ifindex]
|
|
|
|
def _Neighbour(self, version, is_add, addr, lladdr, dev, state, flags=0):
|
|
"""Adds or deletes a neighbour cache entry."""
|
|
family = self._AddressFamily(version)
|
|
|
|
# Convert the link-layer address to a raw byte string.
|
|
if is_add and lladdr:
|
|
lladdr = lladdr.split(":")
|
|
if len(lladdr) != 6:
|
|
raise ValueError("Invalid lladdr %s" % ":".join(lladdr))
|
|
lladdr = "".join(chr(int(hexbyte, 16)) for hexbyte in lladdr)
|
|
|
|
ndmsg = NdMsg((family, dev, state, 0, RTN_UNICAST)).Pack()
|
|
ndmsg += self._NlAttrIPAddress(NDA_DST, family, addr)
|
|
if is_add and lladdr:
|
|
ndmsg += self._NlAttr(NDA_LLADDR, lladdr)
|
|
command = RTM_NEWNEIGH if is_add else RTM_DELNEIGH
|
|
self._SendNlRequest(command, ndmsg, flags)
|
|
|
|
def AddNeighbour(self, version, addr, lladdr, dev):
|
|
self._Neighbour(version, True, addr, lladdr, dev, NUD_PERMANENT)
|
|
|
|
def DelNeighbour(self, version, addr, lladdr, dev):
|
|
self._Neighbour(version, False, addr, lladdr, dev, 0)
|
|
|
|
def UpdateNeighbour(self, version, addr, lladdr, dev, state):
|
|
self._Neighbour(version, True, addr, lladdr, dev, state,
|
|
flags=netlink.NLM_F_REPLACE)
|
|
|
|
def DumpNeighbours(self, version):
|
|
ndmsg = NdMsg((self._AddressFamily(version), 0, 0, 0, 0))
|
|
return self._Dump(RTM_GETNEIGH, ndmsg, NdMsg, "")
|
|
|
|
def ParseNeighbourMessage(self, msg):
|
|
msg, _ = self._ParseNLMsg(msg, NdMsg)
|
|
return msg
|
|
|
|
|
|
if __name__ == "__main__":
|
|
iproute = IPRoute()
|
|
iproute.DEBUG = True
|
|
iproute.DumpRules(6)
|
|
iproute.DumpLinks()
|
|
print iproute.GetRoutes("2001:4860:4860::8888", 0, 0, None)
|