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138 lines
4.4 KiB
138 lines
4.4 KiB
#!/usr/bin/python
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#
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# Copyright 2017 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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"""Generic netlink interface to TCP metrics."""
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from socket import * # pylint: disable=wildcard-import
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import struct
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import cstruct
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import genetlink
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import net_test
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import netlink
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### TCP metrics constants. See include/uapi/linux/tcp_metrics.h.
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# Family name and version
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TCP_METRICS_GENL_NAME = "tcp_metrics"
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TCP_METRICS_GENL_VERSION = 1
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# Message types.
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TCP_METRICS_CMD_GET = 1
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TCP_METRICS_CMD_DEL = 2
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# Attributes.
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TCP_METRICS_ATTR_UNSPEC = 0
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TCP_METRICS_ATTR_ADDR_IPV4 = 1
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TCP_METRICS_ATTR_ADDR_IPV6 = 2
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TCP_METRICS_ATTR_AGE = 3
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TCP_METRICS_ATTR_TW_TSVAL = 4
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TCP_METRICS_ATTR_TW_TS_STAMP = 5
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TCP_METRICS_ATTR_VALS = 6
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TCP_METRICS_ATTR_FOPEN_MSS = 7
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TCP_METRICS_ATTR_FOPEN_SYN_DROPS = 8
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TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS = 9
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TCP_METRICS_ATTR_FOPEN_COOKIE = 10
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TCP_METRICS_ATTR_SADDR_IPV4 = 11
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TCP_METRICS_ATTR_SADDR_IPV6 = 12
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TCP_METRICS_ATTR_PAD = 13
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class TcpMetrics(genetlink.GenericNetlink):
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NL_DEBUG = ["ALL"]
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def __init__(self):
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super(TcpMetrics, self).__init__()
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# Generic netlink family IDs are dynamically assigned. Find ours.
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ctrl = genetlink.GenericNetlinkControl()
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self.family = ctrl.GetFamily(TCP_METRICS_GENL_NAME)
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def _Decode(self, command, msg, nla_type, nla_data):
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"""Decodes TCP metrics netlink attributes to human-readable format."""
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name = self._GetConstantName(__name__, nla_type, "TCP_METRICS_ATTR_")
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if name in ["TCP_METRICS_ATTR_ADDR_IPV4", "TCP_METRICS_ATTR_SADDR_IPV4"]:
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data = inet_ntop(AF_INET, nla_data)
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elif name in ["TCP_METRICS_ATTR_ADDR_IPV6", "TCP_METRICS_ATTR_SADDR_IPV6"]:
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data = inet_ntop(AF_INET6, nla_data)
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elif name in ["TCP_METRICS_ATTR_AGE"]:
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data = struct.unpack("=Q", nla_data)[0]
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elif name in ["TCP_METRICS_ATTR_TW_TSVAL", "TCP_METRICS_ATTR_TW_TS_STAMP"]:
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data = struct.unpack("=I", nla_data)[0]
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elif name == "TCP_METRICS_ATTR_FOPEN_MSS":
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data = struct.unpack("=H", nla_data)[0]
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elif name == "TCP_METRICS_ATTR_FOPEN_COOKIE":
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data = nla_data
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else:
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data = nla_data.encode("hex")
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return name, data
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def MaybeDebugCommand(self, command, unused_flags, data):
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if "ALL" not in self.NL_DEBUG and command not in self.NL_DEBUG:
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return
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parsed = self._ParseNLMsg(data, genetlink.Genlmsghdr)
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def _NlAttrSaddr(self, address):
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if ":" not in address:
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family = AF_INET
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nla_type = TCP_METRICS_ATTR_SADDR_IPV4
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else:
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family = AF_INET6
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nla_type = TCP_METRICS_ATTR_SADDR_IPV6
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return self._NlAttrIPAddress(nla_type, family, address)
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def _NlAttrTcpMetricsAddr(self, address, is_source):
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version = net_test.GetAddressVersion(address)
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family = net_test.GetAddressFamily(version)
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if version == 5:
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address = address.replace("::ffff:", "")
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nla_name = "TCP_METRICS_ATTR_%s_IPV%d" % (
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"SADDR" if is_source else "ADDR", version)
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nla_type = globals()[nla_name]
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return self._NlAttrIPAddress(nla_type, family, address)
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def _NlAttrAddr(self, address):
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return self._NlAttrTcpMetricsAddr(address, False)
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def _NlAttrSaddr(self, address):
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return self._NlAttrTcpMetricsAddr(address, True)
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def DumpMetrics(self):
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"""Dumps all TCP metrics."""
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return self._Dump(self.family, TCP_METRICS_CMD_GET, 1)
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def GetMetrics(self, saddr, daddr):
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"""Returns TCP metrics for the specified src/dst pair."""
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data = self._NlAttrSaddr(saddr) + self._NlAttrAddr(daddr)
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self._SendCommand(self.family, TCP_METRICS_CMD_GET, 1, data,
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netlink.NLM_F_REQUEST)
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hdr, attrs = self._GetMsg(genetlink.Genlmsghdr)
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return attrs
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def DelMetrics(self, saddr, daddr):
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"""Deletes TCP metrics for the specified src/dst pair."""
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data = self._NlAttrSaddr(saddr) + self._NlAttrAddr(daddr)
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self._SendCommand(self.family, TCP_METRICS_CMD_DEL, 1, data,
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netlink.NLM_F_REQUEST)
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if __name__ == "__main__":
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t = TcpMetrics()
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print(t.DumpMetrics())
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