# -- coding: utf-8 --
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# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
import logging
from netaddr import IPAddress, IPNetwork
import subprocess
import time
import CsHelper
from CsDatabag import CsDataBag
from CsApp import CsApache, CsDnsmasq, CsPasswdSvc
from CsRoute import CsRoute
from CsRule import CsRule

VRRP_TYPES = ['guest']

class CsAddress(CsDataBag):

    def compare(self):
        for dev in CsDevice('', self.config).list():
            ip = CsIP(dev, self.config)
            ip.compare(self.dbag)

    def get_interfaces(self):
        interfaces = []
        for dev in self.dbag:
            if dev == "id":
                continue
            for ip in self.dbag[dev]:
                interfaces.append(CsInterface(ip, self.config))
        return interfaces

    def get_guest_if(self):
        """
        Return CsInterface object for the lowest in use guest interface
        """
        guest_interface = None
        lowest_device = 1000
        for interface in self.get_interfaces():
            if interface.is_guest() and interface.is_added():
                device = interface.get_device()
                device_suffix = int(''.join([digit for digit in device if digit.isdigit()]))
                if device_suffix < lowest_device:
                    lowest_device = device_suffix
                    guest_interface = interface
                    logging.debug("Guest interface will be set on device '%s' and IP '%s'" % (guest_interface.get_device(), guest_interface.get_ip()))
        return guest_interface

    def get_guest_ip(self):
        """
        Return the ip of the first guest interface
        For use with routers not vpcrouters
        """
        ip = self.get_guest_if()
        if ip:
            return ip.get_ip()
        return None

    def get_guest_netmask(self):
        """
        Return the netmask of the first guest interface
        For use with routers not vpcrouters
        """
        ip = self.get_guest_if()
        if ip:
            return ip.get_netmask()
        return "255.255.255.0"

    def needs_vrrp(self, o):
        """
        Returns if the ip needs to be managed by keepalived or not
        """
        if "nw_type" in o and o['nw_type'] in VRRP_TYPES:
            return True
        return False

    def get_control_if(self):
        """
        Return the address object that has the control interface
        """
        for interface in self.get_interfaces():
            if interface.is_control():
                return interface
        return None

    def process(self):
        for dev in self.dbag:
            if dev == "id":
                continue
            ip = CsIP(dev, self.config)

            for address in self.dbag[dev]:
                ip.setAddress(address)
                logging.info("Address found in DataBag ==> %s" % address)

                if not address['add'] and not ip.configured():
                    logging.info("Skipping %s as the add flag is set to %s " % (address['public_ip'], address['add']))
                    continue

                if ip.configured():
                    logging.info(
                        "Address %s on device %s already configured", ip.ip(), dev)

                    ip.post_configure(address)
                else:
                    logging.info(
                        "Address %s on device %s not configured", ip.ip(), dev)

                    if CsDevice(dev, self.config).waitfordevice():
                        ip.configure(address)


class CsInterface:

    """ Hold one single ip """

    def __init__(self, o, config):
        self.address = o
        self.config = config

    def get_ip(self):
        return self.get_attr("public_ip")

    def get_network(self):
        return self.get_attr("network")

    def get_netmask(self):
        return self.get_attr("netmask")

    def get_gateway(self):
        if self.config.is_vpc() or not self.is_guest():
            return self.get_attr("gateway")
        else:
            return self.config.cmdline().get_guest_gw()

    def ip_in_subnet(self, ip):
        ipo = IPAddress(ip)
        net = IPNetwork("%s/%s" % (self.get_ip(), self.get_size()))
        return ipo in net

    def get_gateway_cidr(self):
        return "%s/%s" % (self.get_gateway(), self.get_size())

    def get_size(self):
        """ Return the network size in bits (24, 16, 8 etc) """
        return self.get_attr("size")

    def get_device(self):
        return self.get_attr("device")

    def get_cidr(self):
        return self.get_attr("cidr")

    def get_broadcast(self):
        return self.get_attr("broadcast")

    def get_attr(self, attr):
        if attr in self.address:
            return self.address[attr]
        else:
            return "ERROR"

    def needs_vrrp(self):
        """
        Returns if the ip needs to be managed by keepalived or not
        """
        if "nw_type" in self.address and self.address['nw_type'] in VRRP_TYPES:
            return True
        return False

    def is_control(self):
        if "nw_type" in self.address and self.address['nw_type'] in ['control']:
            return True
        return False

    def is_guest(self):
        if "nw_type" in self.address and self.address['nw_type'] in ['guest']:
            return True
        return False

    def is_public(self):
        if "nw_type" in self.address and self.address['nw_type'] in ['public']:
            return True
        return False

    def is_added(self):
        return self.get_attr("add")

    def to_str(self):
        return self.address


class CsDevice:

    """ Configure Network Devices """

    def __init__(self, dev, config):
        self.devlist = []
        self.dev = dev
        self.buildlist()
        self.table = ''
        self.tableNo = ''
        if dev != '':
            self.tableNo = dev[3:]
            self.table = "Table_%s" % dev
        self.fw = config.get_fw()
        self.cl = config.cmdline()

    def configure_rp(self):
        """
        Configure Reverse Path Filtering
        """
        filename = "/proc/sys/net/ipv4/conf/%s/rp_filter" % self.dev
        CsHelper.updatefile(filename, "1\n", "w")

    def buildlist(self):
        """
        List all available network devices on the system
        """
        self.devlist = []
        for line in open('/proc/net/dev'):
            vals = line.lstrip().split(':')
            if (not vals[0].startswith("eth")):
                continue
            self.devlist.append(vals[0])

    def waitfordevice(self, timeout=2):
        count = 0
        while count < timeout:
            if self.dev in self.devlist:
                return True
            time.sleep(1)
            count += 1
            self.buildlist()
        logging.error(
            "Device %s cannot be configured - device was not found", self.dev)
        return False

    def list(self):
        return self.devlist


class CsIP:

    def __init__(self, dev, config):
        self.dev = dev
        self.dnum = hex(int(dev[3:]))
        self.iplist = {}
        self.address = {}
        self.list()
        self.fw = config.get_fw()
        self.cl = config.cmdline()
        self.config = config

    def setAddress(self, address):
        self.address = address

    def getAddress(self):
        return self.address

    def configure(self, address):
        # When "add" is false, it means that the IP has to be removed.
        if address["add"]:
            try:
                logging.info("Configuring address %s on device %s", self.ip(), self.dev)
                cmd = "ip addr add dev %s %s brd +" % (self.dev, self.ip())
                CsHelper.execute(cmd)
            except Exception as e:
                logging.info("Exception occurred ==> %s" % e)

            self.post_configure(address)
        else:
            # delete method performs post_configure, so no need to call post_configure here
            self.delete(self.ip())

    def post_configure(self, address):
        """ The steps that must be done after a device is configured """
        route = CsRoute()
        if not self.get_type() in ["control"]:
            route.add_table(self.dev)

            CsRule(self.dev).addMark()

            interfaces = [CsInterface(address, self.config)]
            CsHelper.reconfigure_interfaces(self.cl, interfaces)
            if not self.config.is_vpc() and (self.get_type() in ['public']):
                self.set_mark()
            if self.config.is_vpc() and (self.get_type() in ['public']):
                self.set_mark()

            if 'gateway' in self.address:
                self.arpPing()

            CsRpsrfs(self.dev).enable()
            self.post_config_change("add")

        '''For isolated/redundant and dhcpsrvr routers, call this method after the post_config is complete '''
        if not self.config.is_vpc():
            self.setup_router_control()

        if self.config.is_vpc() or self.cl.is_redundant():
            # The code looks redundant here, but we actually have to cater for routers and
            # VPC routers in a different manner. Please do not remove this block otherwise
            # The VPC default route will be broken.
            if self.get_type() in ["public"] and address["device"] == CsHelper.PUBLIC_INTERFACES[self.cl.get_type()]:
                gateway = str(address["gateway"])
                route.add_defaultroute(gateway)
        else:
            # once we start processing public ip's we need to verify there
            # is a default route and add if needed
            if(self.cl.get_gateway()):
                route.add_defaultroute(self.cl.get_gateway())

    def set_mark(self):
        cmd = "-A PREROUTING -i %s -m state --state NEW -j CONNMARK --set-xmark %s/0xffffffff" % \
            (self.getDevice(), self.dnum)
        self.fw.append(["mangle", "", cmd])

    def get_type(self):
        """ Return the type of the IP
        guest
        control
        public
        """
        if "nw_type" in self.address:
            return self.address['nw_type']
        return "unknown"

    def get_ip_address(self):
        """
        Return ip address if known
        """
        if "public_ip" in self.address:
            return self.address['public_ip']
        return "unknown"

    def setup_router_control(self):
        if self.config.is_vpc():
            return

        self.fw.append(
            ["filter", "", "-A FW_OUTBOUND -m state --state RELATED,ESTABLISHED -j ACCEPT"])
        self.fw.append(
            ["filter", "", "-A INPUT -i eth1 -p tcp -m tcp --dport 3922 -m state --state NEW,ESTABLISHED -j ACCEPT"])

        self.fw.append(["filter", "", "-P INPUT DROP"])
        self.fw.append(["filter", "", "-P FORWARD DROP"])


    def fw_router(self):
        if self.config.is_vpc():
            return
        self.fw.append(["mangle", "front", "-A PREROUTING " +
                        "-m state --state RELATED,ESTABLISHED " +
                        "-j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff"])

        self.fw.append(["mangle", "front",
                        "-A POSTROUTING " +
                        "-p udp -m udp --dport 68 -j CHECKSUM --checksum-fill"])

        if self.get_type() in ["public"]:
            self.fw.append(["mangle", "front",
                            "-A PREROUTING " +
                            "-d %s/32 -j VPN_%s" % (self.address['public_ip'], self.address['public_ip'])])
            self.fw.append(["mangle", "front",
                            "-A PREROUTING " +
                            "-d %s/32 -j FIREWALL_%s" % (self.address['public_ip'], self.address['public_ip'])])
            self.fw.append(["mangle", "front",
                            "-A FIREWALL_%s " % self.address['public_ip'] +
                            "-m state --state RELATED,ESTABLISHED -j ACCEPT"])
            self.fw.append(["mangle", "",
                            "-A FIREWALL_%s DROP" % self.address['public_ip']])
            self.fw.append(["mangle", "",
                            "-A VPN_%s -m state --state RELATED,ESTABLISHED -j ACCEPT" % self.address['public_ip']])
            self.fw.append(["mangle", "",
                            "-A VPN_%s -j RETURN" % self.address['public_ip']])
            self.fw.append(["nat", "",
                            "-A POSTROUTING -o eth2 -j SNAT --to-source %s" % self.address['public_ip']])
            self.fw.append(["mangle", "",
                            "-A PREROUTING -i %s -m state --state NEW " % self.dev +
                            "-j CONNMARK --set-xmark %s/0xffffffff" % self.dnum])
            self.fw.append(
                ["mangle", "", "-A FIREWALL_%s -j DROP" % self.address['public_ip']])
            self.fw.append(["filter", "",
                            "-A FORWARD -i %s -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT" % self.dev])
            self.fw.append(["filter", "",
                            "-A FORWARD -i eth0 -o %s -j FW_OUTBOUND" % self.dev])

        self.fw.append(["filter", "", "-A INPUT -d 224.0.0.18/32 -j ACCEPT"])
        self.fw.append(["filter", "", "-A INPUT -d 225.0.0.50/32 -j ACCEPT"])
        self.fw.append(["filter", "", "-A INPUT -i %s -m state --state RELATED,ESTABLISHED -j ACCEPT" %
                        self.dev])
        self.fw.append(["filter", "", "-A INPUT -p icmp -j ACCEPT"])
        self.fw.append(["filter", "", "-A INPUT -i lo -j ACCEPT"])

        if self.get_type() in ["guest"]:
            guestNetworkCidr = self.address['network']
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p udp -m udp --dport 67 -j ACCEPT" % self.dev])
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p udp -m udp --dport 53 -s %s -j ACCEPT" % (self.dev, guestNetworkCidr)])
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p tcp -m tcp --dport 53 -s %s -j ACCEPT" % (self.dev, guestNetworkCidr)])
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p tcp -m tcp --dport 80 -m state --state NEW -j ACCEPT" % self.dev])
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p tcp -m tcp --dport 8080 -m state --state NEW -j ACCEPT" % self.dev])
            self.fw.append(
                ["filter", "", "-A FORWARD -i %s -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEPT" % self.dev])
            self.fw.append(
                ["filter", "", "-A FORWARD -i %s -o %s -m state --state NEW -j ACCEPT" % (self.dev, self.dev)])
            self.fw.append(
                ["filter", "", "-A FORWARD -i eth0 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT"])

        self.fw.append(['', 'front', '-A FORWARD -j NETWORK_STATS'])
        self.fw.append(['', 'front', '-A INPUT -j NETWORK_STATS'])
        self.fw.append(['', 'front', '-A OUTPUT -j NETWORK_STATS'])
        self.fw.append(['', '', '-A NETWORK_STATS -i eth0 -o eth2'])
        self.fw.append(['', '', '-A NETWORK_STATS -i eth2 -o eth0'])
        self.fw.append(['', '', '-A NETWORK_STATS -o eth2 ! -i eth0 -p tcp'])
        self.fw.append(['', '', '-A NETWORK_STATS -i eth2 ! -o eth0 -p tcp'])

    def fw_vpcrouter(self):
        if not self.config.is_vpc():
            return

        self.fw.append(["filter", "", "-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT"])

        if self.get_type() in ["guest"]:
            self.fw.append(["mangle", "front", "-A PREROUTING " +
                            " -i %s -m state --state RELATED,ESTABLISHED "  % self.dev +
                            "-j CONNMARK --restore-mark --nfmask 0xffffffff --ctmask 0xffffffff"])
            guestNetworkCidr = self.address['network']
            self.fw.append(["filter", "", "-A FORWARD -d %s -o %s -j ACL_INBOUND_%s" %
                            (guestNetworkCidr, self.dev, self.dev)])
            self.fw.append(
                ["filter", "front", "-A ACL_INBOUND_%s -d 224.0.0.18/32 -j ACCEPT" % self.dev])
            self.fw.append(
                ["filter", "front", "-A ACL_INBOUND_%s -d 225.0.0.50/32 -j ACCEPT" % self.dev])
            self.fw.append(
                ["filter", "", "-A ACL_INBOUND_%s -j DROP" % self.dev])

            self.fw.append(
                ["mangle", "front", "-A ACL_OUTBOUND_%s -d 225.0.0.50/32 -j ACCEPT" % self.dev])
            self.fw.append(
                ["mangle", "front", "-A ACL_OUTBOUND_%s -d 224.0.0.18/32 -j ACCEPT" % self.dev])
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p udp -m udp --dport 67 -j ACCEPT" % self.dev])
            self.fw.append(
                ["mangle", "front", "-A POSTROUTING " + "-p udp -m udp --dport 68 -j CHECKSUM --checksum-fill"])
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p udp -m udp --dport 53 -s %s -j ACCEPT" % (self.dev, guestNetworkCidr)])
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p tcp -m tcp --dport 53 -s %s -j ACCEPT" % (self.dev, guestNetworkCidr)])

            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p tcp -m tcp --dport 80 -m state --state NEW -j ACCEPT" % self.dev])
            self.fw.append(
                ["filter", "", "-A INPUT -i %s -p tcp -m tcp --dport 8080 -m state --state NEW -j ACCEPT" % self.dev])
            self.fw.append(["mangle", "",
                            "-A PREROUTING -m state --state NEW -i %s -s %s ! -d %s/32 -j ACL_OUTBOUND_%s" %
                            (self.dev, guestNetworkCidr, self.address['gateway'], self.dev)])

            self.fw.append(["", "front", "-A NETWORK_STATS_%s -i %s -d %s" %
                            ("eth1", "eth1", guestNetworkCidr)])
            self.fw.append(["", "front", "-A NETWORK_STATS_%s -o %s -s %s" %
                            ("eth1", "eth1", guestNetworkCidr)])

            self.fw.append(["nat", "front",
                            "-A POSTROUTING -s %s -o %s -j SNAT --to-source %s" %
                            (guestNetworkCidr, self.dev, self.address['public_ip'])])

        if self.get_type() in ["public"]:
            self.fw.append(["", "front",
                            "-A FORWARD -o %s -d %s -j ACL_INBOUND_%s" % (
                                self.dev, self.address['network'], self.dev)
                            ])
            self.fw.append(
                ["mangle", "", "-A FORWARD -j VPN_STATS_%s" % self.dev])
            self.fw.append(
                ["mangle", "", "-A VPN_STATS_%s -o %s -m mark --mark 0x525/0xffffffff" % (self.dev, self.dev)])
            self.fw.append(
                ["mangle", "", "-A VPN_STATS_%s -i %s -m mark --mark 0x524/0xffffffff" % (self.dev, self.dev)])
            self.fw.append(
                ["", "front", "-A FORWARD -j NETWORK_STATS_%s" % self.dev])

        self.fw.append(["", "front", "-A FORWARD -j NETWORK_STATS"])
        self.fw.append(["", "front", "-A INPUT -j NETWORK_STATS"])
        self.fw.append(["", "front", "-A OUTPUT -j NETWORK_STATS"])

        self.fw.append(["", "", "-A NETWORK_STATS -i eth0 -o eth2 -p tcp"])
        self.fw.append(["", "", "-A NETWORK_STATS -i eth2 -o eth0 -p tcp"])
        self.fw.append(["", "", "-A NETWORK_STATS ! -i eth0 -o eth2 -p tcp"])
        self.fw.append(["", "", "-A NETWORK_STATS -i eth2 ! -o eth0 -p tcp"])

        self.fw.append(["filter", "", "-A INPUT -d 224.0.0.18/32 -j ACCEPT"])
        self.fw.append(["filter", "", "-A INPUT -d 225.0.0.50/32 -j ACCEPT"])

        self.fw.append(["filter", "", "-A INPUT -p icmp -j ACCEPT"])
        self.fw.append(["filter", "", "-A INPUT -i lo -j ACCEPT"])

        self.fw.append(["filter", "", "-A INPUT -i eth0 -p tcp -m tcp --dport 3922 -m state --state NEW,ESTABLISHED -j ACCEPT"])
        self.fw.append(["filter", "", "-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT"])

        self.fw.append(["filter", "", "-P INPUT DROP"])
        self.fw.append(["filter", "", "-P FORWARD DROP"])

    def post_config_change(self, method):
        route = CsRoute()
        tableName = "Table_" + self.dev

        if method == "add":
            if not self.config.is_vpc():
                # treat the first IP on a interface as special case to set up the routing rules
                if self.get_type() in ["public"] and (len(self.iplist) == 1):
                    CsHelper.execute("sudo ip route add throw " + self.config.address().dbag['eth0'][0]['network'] + " table " + tableName + " proto static")
                    CsHelper.execute("sudo ip route add throw " + self.config.address().dbag['eth1'][0]['network'] + " table " + tableName + " proto static")

                # add 'defaul via gateway' rule in the device specific routing table
                if "gateway" in self.address and self.address["gateway"] != "None":
                    route.add_route(self.dev, self.address["gateway"])
                route.add_network_route(self.dev, str(self.address["network"]))

                if self.get_type() in ["public"]:
                    CsRule(self.dev).addRule("from " + str(self.address["network"]))

            if self.config.is_vpc():
                if self.get_type() in ["public"] and "gateway" in self.address and self.address["gateway"] != "None":
                    route.add_route(self.dev, self.address["gateway"])
                route.add_network_route(self.dev, str(self.address["network"]))

            CsHelper.execute("sudo ip route flush cache")

        elif method == "delete":
            # treat the last IP to be dis-associated with interface as special case to clean up the routing rules
            if self.get_type() in ["public"] and (not self.config.is_vpc()) and (len(self.iplist) == 0):
                CsHelper.execute("sudo ip rule delete table " + tableName)
                CsHelper.execute("sudo ip route flush table " + tableName)
                CsHelper.execute("sudo ip route flush cache")
                CsRule(self.dev).delMark()

        self.fw_router()
        self.fw_vpcrouter()

        # On deletion nw_type will no longer be known
        if self.get_type() in ('guest'):
            if self.config.is_vpc() or self.config.is_router():
                CsDevice(self.dev, self.config).configure_rp()
                logging.error(
                    "Not able to setup source-nat for a regular router yet")

            if self.config.has_dns() or self.config.is_dhcp():
                dns = CsDnsmasq(self)
                dns.add_firewall_rules()

            if self.config.has_metadata():
                app = CsApache(self)
                app.setup()

        cmdline = self.config.cmdline()
        # If redundant then this is dealt with by the master backup functions
        if self.get_type() in ["guest"] and not cmdline.is_redundant():
            pwdsvc = CsPasswdSvc(self.address['public_ip']).start()

        if self.get_type() == "public" and self.config.is_vpc() and method == "add":
            if self.address["source_nat"]:
                vpccidr = cmdline.get_vpccidr()
                self.fw.append(
                    ["filter", 3, "-A FORWARD -s %s ! -d %s -j ACCEPT" % (vpccidr, vpccidr)])
                self.fw.append(
                    ["nat", "", "-A POSTROUTING -j SNAT -o %s --to-source %s" % (self.dev, self.address['public_ip'])])

    def list(self):
        self.iplist = {}
        cmd = ("ip addr show dev " + self.dev)
        for i in CsHelper.execute(cmd):
            vals = i.lstrip().split()
            if (vals[0] == 'inet'):
                cidr = vals[1]
                self.iplist[cidr] = self.dev

    def configured(self):
        if self.address['cidr'] in self.iplist.keys():
            return True
        return False

    def needs_vrrp(self):
        """
        Returns if the ip needs to be managed by keepalived or not
        """
        if "nw_type" in self.address and self.address['nw_type'] in VRRP_TYPES:
            return True
        return False

    def is_public(self):
        if "nw_type" in self.address and self.address['nw_type'] in ['public']:
            return True
        return False

    def ip(self):
        return str(self.address['cidr'])

    def getDevice(self):
        return self.dev

    def hasIP(self, ip):
        return ip in self.address.values()

    def arpPing(self):
        cmd = "arping -c 1 -I %s -A -U -s %s %s" % (
            self.dev, self.address['public_ip'], self.address['gateway'])
        CsHelper.execute(cmd)

    # Delete any ips that are configured but not in the bag
    def compare(self, bag):
        if len(self.iplist) > 0 and (self.dev not in bag.keys() or len(bag[self.dev]) == 0):
            # Remove all IPs on this device
            logging.info(
                "Will remove all configured addresses on device %s", self.dev)
            self.delete("all")
            app = CsApache(self)
            app.remove()

        # This condition should not really happen but did :)
        # It means an apache file got orphaned after a guest network address
        # was deleted
        if len(self.iplist) == 0 and (self.dev not in bag.keys() or len(bag[self.dev]) == 0):
            app = CsApache(self)
            app.remove()

        for ip in self.iplist:
            found = False
            if self.dev in bag.keys():
                for address in bag[self.dev]:
                    self.setAddress(address)
                    if (self.hasIP(ip) or self.is_guest_gateway(address, ip)) and address["add"]:
                        logging.debug("The IP address in '%s' will be configured" % address)
                        found = True
            if not found:
                self.delete(ip)

    def is_guest_gateway(self, bag, ip):
        """ Exclude the vrrp maintained addresses on a redundant router """
        interface = CsInterface(bag, self.config)
        if not self.config.cl.is_redundant():
            return False

        rip = ip.split('/')[0]
        logging.info("Checking if cidr is a gateway for rVPC. IP ==> %s / device ==> %s", ip, self.dev)

        gw = interface.get_gateway()
        logging.info("Interface has the following gateway ==> %s", gw)

        if bag['nw_type'] == "guest" and rip == gw:
            return True
        return False

    def delete(self, ip):
        remove = []
        if ip == "all":
            logging.info("Removing addresses from device %s", self.dev)
            remove = self.iplist.keys()
        else:
            remove.append(ip)
        for ip in remove:
            cmd = "ip addr del dev %s %s" % (self.dev, ip)
            subprocess.call(cmd, shell=True)
            logging.info("Removed address %s from device %s", ip, self.dev)
            self.post_config_change("delete")


class CsRpsrfs:

    """ Configure rpsrfs if there is more than one cpu """

    def __init__(self, dev):
        self.dev = dev

    def enable(self):
        if not self.inKernel():
            return
        cpus = self.cpus()
        if cpus < 2:
            return
        val = format((1 << cpus) - 1, "x")
        filename = "/sys/class/net/%s/queues/rx-0/rps_cpus" % (self.dev)
        CsHelper.updatefile(filename, val, "w+")
        CsHelper.updatefile(
            "/proc/sys/net/core/rps_sock_flow_entries", "256", "w+")
        filename = "/sys/class/net/%s/queues/rx-0/rps_flow_cnt" % (self.dev)
        CsHelper.updatefile(filename, "256", "w+")
        logging.debug("rpsfr is configured for %s cpus" % (cpus))

    def inKernel(self):
        try:
            open('/etc/rpsrfsenable')
        except IOError:
            logging.debug("rpsfr is not present in the kernel")
            return False
        else:
            logging.debug("rpsfr is present in the kernel")
            return True

    def cpus(self):
        count = 0
        for line in open('/proc/cpuinfo'):
            if "processor" not in line:
                continue
            count += 1
        if count < 2:
            logging.debug("Single CPU machine")
        return count