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561630e449
This fixes routing table rule setup regression to correctly router marked packets based on interface related ip route tables. This thereby fixes the access of VMs in the same VPC using NAT/SNAT public IPs. Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
121 lines
4.4 KiB
Python
Executable File
121 lines
4.4 KiB
Python
Executable File
# -- coding: utf-8 --
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. 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,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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import CsHelper
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import logging
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class CsRoute:
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""" Manage routes """
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def __init__(self):
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self.table_prefix = "Table_"
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def get_tablename(self, name):
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return self.table_prefix + name
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def add_table(self, devicename):
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tablenumber = devicename[3:]
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tablename = self.get_tablename(devicename)
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str = "%s %s" % (tablenumber, tablename)
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filename = "/etc/iproute2/rt_tables"
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logging.info("Adding route table: " + str + " to " + filename + " if not present ")
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if not CsHelper.definedinfile(filename, str):
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CsHelper.execute("sudo echo " + str + " >> /etc/iproute2/rt_tables")
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# remove "from all table tablename" if exists, else it will interfer with
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# routing of unintended traffic
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if self.findRule("from all lookup " + tablename):
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CsHelper.execute("sudo ip rule delete from all table " + tablename)
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def flush_table(self, tablename):
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CsHelper.execute("ip route flush table %s" % (tablename))
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CsHelper.execute("ip route flush cache")
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def add_route(self, dev, address):
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""" Wrapper method that adds table name and device to route statement """
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# ip route add dev eth1 table Table_eth1 10.0.2.0/24
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table = self.get_tablename(dev)
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logging.info("Adding route: dev " + dev + " table: " +
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table + " network: " + address + " if not present")
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cmd = "dev %s table %s %s" % (dev, table, address)
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cmd = "default via %s table %s proto static" % (address, table)
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self.set_route(cmd)
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def add_network_route(self, dev, address):
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""" Wrapper method that adds table name and device to route statement """
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# ip route add dev eth1 table Table_eth1 10.0.2.0/24
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table = self.get_tablename(dev)
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logging.info("Adding route: dev " + dev + " table: " +
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table + " network: " + address + " if not present")
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cmd = "throw %s table %s proto static" % (address, table)
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self.set_route(cmd)
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def set_route(self, cmd, method="add"):
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""" Add a route if it is not already defined """
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found = False
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search = cmd
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if "throw" in search:
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search = "type " + search
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for i in CsHelper.execute("ip route show " + search):
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found = True
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if not found and method == "add":
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logging.info("Add " + cmd)
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cmd = "ip route add " + cmd
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elif found and method == "delete":
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logging.info("Delete " + cmd)
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cmd = "ip route delete " + cmd
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else:
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return
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CsHelper.execute(cmd)
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def add_defaultroute(self, gateway):
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""" Add a default route
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:param str gateway
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:return: bool
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"""
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if not gateway:
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raise Exception("Gateway cannot be None.")
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if self.defaultroute_exists():
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return False
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else:
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cmd = "default via " + gateway
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logging.info("Adding default route")
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self.set_route(cmd)
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return True
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def defaultroute_exists(self):
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""" Return True if a default route is present
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:return: bool
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"""
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logging.info("Checking if default ipv4 route is present")
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route_found = CsHelper.execute("ip -4 route list 0/0")
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if len(route_found) > 0:
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logging.info("Default route found: " + route_found[0])
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return True
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else:
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logging.warn("No default route found!")
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return False
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def findRule(self, rule):
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for i in CsHelper.execute("ip rule show"):
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if rule in i.strip():
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return True
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return False
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