path: root/resources/libraries/python/IPUtil.py

# Copyright (c) 2019 Cisco and/or its affiliates.
# Licensed 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.

"""Common IP utilities library."""

import re

from socket import AF_INET, AF_INET6, inet_ntop, inet_pton

from ipaddress import ip_address
from ipaddress import IPv4Network, IPv6Network, IPv4Address, IPv6Address
from ipaddress import AddressValueError, NetmaskValueError

from resources.libraries.python.Constants import Constants
from resources.libraries.python.InterfaceUtil import InterfaceUtil
from resources.libraries.python.PapiExecutor import PapiExecutor
from resources.libraries.python.ssh import exec_cmd_no_error, exec_cmd
from resources.libraries.python.topology import NodeType, Topology


class IPUtil(object):
    """Common IP utilities"""

    @staticmethod
    def ip_to_int(ip_str):
        """Convert IP address from string format (e.g. 10.0.0.1) to integer
        representation (167772161).

        :param ip_str: IP address in string representation.
        :type ip_str: str
        :returns: Integer representation of IP address.
        :rtype: int
        """
        return int(ip_address(unicode(ip_str)))

    @staticmethod
    def int_to_ip(ip_int):
        """Convert IP address from integer representation (e.g. 167772161) to
        string format (10.0.0.1).

        :param ip_int: IP address in integer representation.
        :type ip_int: int
        :returns: String representation of IP address.
        :rtype: str
        """
        return str(ip_address(ip_int))

    @staticmethod
    def vpp_get_interface_ip_addresses(node, interface, ip_version):
        """Get list of IP addresses from an interface on a VPP node.

        :param node: VPP node.
        :param interface: Name of an interface on the VPP node.
        :param ip_version: IP protocol version (ipv4 or ipv6).
        :type node: dict
        :type interface: str
        :type ip_version: str
        :returns: List of dictionaries, each containing IP address, subnet
            prefix length and also the subnet mask for ipv4 addresses.
            Note: A single interface may have multiple IP addresses assigned.
        :rtype: list
        """
        try:
            sw_if_index = Topology.convert_interface_reference(
                node, interface, 'sw_if_index')
        except RuntimeError:
            if isinstance(interface, basestring):
                sw_if_index = InterfaceUtil.get_sw_if_index(node, interface)
            else:
                raise

        is_ipv6 = 1 if ip_version == 'ipv6' else 0

        cmd = 'ip_address_dump'
        cmd_reply = 'ip_address_details'
        args = dict(sw_if_index=sw_if_index,
                    is_ipv6=is_ipv6)
        err_msg = 'Failed to get L2FIB dump on host {host}'.format(
            host=node['host'])

        with PapiExecutor(node) as papi_exec:
            papi_resp = papi_exec.add(cmd, **args).get_dump(err_msg)

        data = list()
        for item in papi_resp.reply[0]['api_reply']:
            item[cmd_reply]['ip'] = inet_ntop(AF_INET6, item[cmd_reply]['ip']) \
                if is_ipv6 else inet_ntop(AF_INET, item[cmd_reply]['ip'][0:4])
            item[cmd_reply]['netmask'] = str(
                IPv6Network(unicode('::/{pl}'.format(
                    pl=item[cmd_reply]['prefix_length']))).netmask) if is_ipv6 \
                else str(IPv4Network(unicode('0.0.0.0/{pl}'.format(
                    pl=item[cmd_reply]['prefix_length']))).netmask)
            data.append(item[cmd_reply])

        return data

    @staticmethod
    def get_interface_vrf_table(node, interface, ip_version='ipv4'):
        """Get vrf ID for the given interface.

        :param node: VPP node.
        :param interface: Name or sw_if_index of a specific interface.
        :type node: dict
        :param ip_version: IP protocol version (ipv4 or ipv6).
        :type interface: str or int
        :type ip_version: str
        :returns: vrf ID of the specified interface.
        :rtype: int
        """
        if isinstance(interface, basestring):
            sw_if_index = InterfaceUtil.get_sw_if_index(node, interface)
        else:
            sw_if_index = interface

        is_ipv6 = 1 if ip_version == 'ipv6' else 0

        cmd = 'sw_interface_get_table'
        args = dict(sw_if_index=sw_if_index,
                    is_ipv6=is_ipv6)
        err_msg = 'Failed to get VRF id assigned to interface {ifc}'.format(
            ifc=interface)

        with PapiExecutor(node) as papi_exec:
            papi_resp = papi_exec.add(cmd, **args).get_replies(err_msg). \
                verify_reply(err_msg=err_msg)

        return papi_resp['vrf_id']

    @staticmethod
    def vpp_ip_source_check_setup(node, if_name):
        """Setup Reverse Path Forwarding source check on interface.

        :param node: VPP node.
        :param if_name: Interface name to setup RPF source check.
        :type node: dict
        :type if_name: str
        """
        cmd = 'ip_source_check_interface_add_del'
        args = dict(
            sw_if_index=InterfaceUtil.get_interface_index(node, if_name),
            is_add=1,
            loose=0)
        err_msg = 'Failed to enable source check on interface {ifc}'.format(
            ifc=if_name)
        with PapiExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_replies(err_msg). \
                verify_reply(err_msg=err_msg)

    @staticmethod
    def vpp_ip_probe(node, interface, addr):
        """Run ip probe on VPP node.

        :param node: VPP node.
        :param interface: Interface key or name.
        :param addr: IPv4/IPv6 address.
        :type node: dict
        :type interface: str
        :type addr: str
        """
        cmd = 'ip_probe_neighbor'
        cmd_reply = 'proxy_arp_intfc_enable_disable_reply'
        args = dict(
            sw_if_index=InterfaceUtil.get_interface_index(node, interface),
            dst=str(addr))
        err_msg = 'VPP ip probe {dev} {ip} failed on {h}'.format(
            dev=interface, ip=addr, h=node['host'])

        with PapiExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_replies(err_msg). \
                verify_reply(cmd_reply=cmd_reply, err_msg=err_msg)

    @staticmethod
    def ip_addresses_should_be_equal(ip1, ip2):
        """Fails if the given IP addresses are unequal.

        :param ip1: IPv4 or IPv6 address.
        :param ip2: IPv4 or IPv6 address.
        :type ip1: str
        :type ip2: str
        """
        addr1 = ip_address(unicode(ip1))
        addr2 = ip_address(unicode(ip2))

        if addr1 != addr2:
            raise AssertionError('IP addresses are not equal: {0} != {1}'.
                                 format(ip1, ip2))

    @staticmethod
    def setup_network_namespace(node, namespace_name, interface_name,
                                ip_addr, prefix):
        """Setup namespace on given node and attach interface and IP to
        this namespace. Applicable also on TG node.

        :param node: VPP node.
        :param namespace_name: Namespace name.
        :param interface_name: Interface name.
        :param ip_addr: IP address of namespace's interface.
        :param prefix: IP address prefix length.
        :type node: dict
        :type namespace_name: str
        :type interface_name: str
        :type ip_addr: str
        :type prefix: int
        """
        cmd = ('ip netns add {0}'.format(namespace_name))
        exec_cmd_no_error(node, cmd, sudo=True)

        cmd = ('ip link set dev {0} up netns {1}'.format(interface_name,
                                                         namespace_name))
        exec_cmd_no_error(node, cmd, sudo=True)

        cmd = ('ip netns exec {0} ip addr add {1}/{2} dev {3}'.format(
            namespace_name, ip_addr, prefix, interface_name))
        exec_cmd_no_error(node, cmd, sudo=True)

    @staticmethod
    def linux_enable_forwarding(node, ip_ver='ipv4'):
        """Enable forwarding on a Linux node, e.g. VM.

        :param node: VPP node.
        :param ip_ver: IP version, 'ipv4' or 'ipv6'.
        :type node: dict
        :type ip_ver: str
        """
        cmd = 'sysctl -w net.{0}.ip_forward=1'.format(ip_ver)
        exec_cmd_no_error(node, cmd, sudo=True)

    @staticmethod
    def get_linux_interface_name(node, pci_addr):
        """Get the interface name.

        :param node: VPP/TG node.
        :param pci_addr: PCI address
        :type node: dict
        :type pci_addr: str
        :returns: Interface name
        :rtype: str
        :raises RuntimeError: If cannot get the information about interfaces.
        """
        regex_intf_info = r"pci@" \
                          r"([0-9a-f]{4}:[0-9a-f]{2}:[0-9a-f]{2}.[0-9a-f])\s*" \
                          r"([a-zA-Z0-9]*)\s*network"

        cmd = "lshw -class network -businfo"
        ret_code, stdout, stderr = exec_cmd(node, cmd, timeout=30, sudo=True)
        if ret_code != 0:
            raise RuntimeError('Could not get information about interfaces:\n'
                               '{err}'.format(err=stderr))

        for line in stdout.splitlines()[2:]:
            try:
                if re.search(regex_intf_info, line).group(1) == pci_addr:
                    return re.search(regex_intf_info, line).group(2)
            except AttributeError:
                continue
        return None

    @staticmethod
    def set_linux_interface_up(node, interface):
        """Set the specified interface up.

        :param node: VPP/TG node.
        :param interface: Interface in namespace.
        :type node: dict
        :type interface: str
        :raises RuntimeError: If the interface could not be set up.
        """
        cmd = "ip link set {0} up".format(interface)
        exec_cmd_no_error(node, cmd, timeout=30, sudo=True)

    @staticmethod
    def set_linux_interface_ip(node, interface, ip_addr, prefix,
                               namespace=None):
        """Set IP address to interface in linux.

        :param node: VPP/TG node.
        :param interface: Interface in namespace.
        :param ip_addr: IP to be set on interface.
        :param prefix: IP prefix.
        :param namespace: Execute command in namespace. Optional
        :type node: dict
        :type interface: str
        :type ip_addr: str
        :type prefix: int
        :type namespace: str
        :raises RuntimeError: IP could not be set.
        """
        if namespace is not None:
            cmd = 'ip netns exec {ns} ip addr add {ip}/{p} dev {dev}'.format(
                ns=namespace, ip=ip_addr, p=prefix, dev=interface)
        else:
            cmd = 'ip addr add {ip}/{p} dev {dev}'.format(
                ip=ip_addr, p=prefix, dev=interface)

        exec_cmd_no_error(node, cmd, timeout=5, sudo=True)

    @staticmethod
    def add_linux_route(node, ip_addr, prefix, gateway, namespace=None):
        """Add linux route in namespace.

        :param node: Node where to execute command.
        :param ip_addr: Route destination IP address.
        :param prefix: IP prefix.
        :param namespace: Execute command in namespace. Optional.
        :param gateway: Gateway address.
        :type node: dict
        :type ip_addr: str
        :type prefix: int
        :type gateway: str
        :type namespace: str
        """
        if namespace is not None:
            cmd = 'ip netns exec {} ip route add {}/{} via {}'.format(
                namespace, ip_addr, prefix, gateway)
        else:
            cmd = 'ip route add {}/{} via {}'.format(ip_addr, prefix, gateway)
        exec_cmd_no_error(node, cmd, sudo=True)

    @staticmethod
    def vpp_interface_set_ip_address(node, interface, address,
                                     prefix_length=None):
        """Set IP address to VPP interface.

        :param node: VPP node.
        :param interface: Interface name.
        :param address: IP address.
        :param prefix_length: Prefix length.
        :type node: dict
        :type interface: str
        :type address: str
        :type prefix_length: int
        """
        try:
            ip_addr = IPv6Address(unicode(address))
            af_inet = AF_INET6
            is_ipv6 = 1
        except (AddressValueError, NetmaskValueError):
            ip_addr = IPv4Address(unicode(address))
            af_inet = AF_INET
            is_ipv6 = 0

        cmd = 'sw_interface_add_del_address'
        args = dict(
            sw_if_index=InterfaceUtil.get_interface_index(node, interface),
            is_add=1,
            is_ipv6=is_ipv6,
            del_all=0,
            address_length=int(prefix_length) if prefix_length else 128
            if is_ipv6 else 32,
            address=inet_pton(af_inet, str(ip_addr)))
        err_msg = 'Failed to add IP address on interface {ifc}'.format(
            ifc=interface)
        with PapiExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_replies(err_msg). \
                verify_reply(err_msg=err_msg)

    @staticmethod
    def vpp_add_ip_neighbor(node, iface_key, ip_addr, mac_address):
        """Add IP neighbor on DUT node.

        :param node: VPP node.
        :param iface_key: Interface key.
        :param ip_addr: IP address of the interface.
        :param mac_address: MAC address of the interface.
        :type node: dict
        :type iface_key: str
        :type ip_addr: str
        :type mac_address: str
        """
        try:
            dst_ip = IPv6Address(unicode(ip_addr))
        except (AddressValueError, NetmaskValueError):
            dst_ip = IPv4Address(unicode(ip_addr))

        neighbor = dict(
            sw_if_index=Topology.get_interface_sw_index(
                node, iface_key),
            flags=0,
            mac_address=str(mac_address),
            ip_address=str(dst_ip))
        cmd = 'ip_neighbor_add_del'
        args = dict(
            is_add=1,
            neighbor=neighbor)
        err_msg = 'Failed to add IP neighbor on interface {ifc}'.format(
            ifc=iface_key)
        with PapiExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_replies(err_msg). \
                verify_reply(err_msg=err_msg)

    @staticmethod
    def vpp_route_add(node, network, prefix_len, **kwargs):
        """Add route to the VPP node.

        :param node: VPP node.
        :param network: Route destination network address.
        :param prefix_len: Route destination network prefix length.
        :param kwargs: Optional key-value arguments:

            gateway: Route gateway address. (str)
            interface: Route interface. (str)
            vrf: VRF table ID. (int)
            count: number of IP addresses to add starting from network IP (int)
            local: The route is local with same prefix (increment is 1).
                If None, then is not used. (bool)
            lookup_vrf: VRF table ID for lookup. (int)
            multipath: Enable multipath routing. (bool)
            weight: Weight value for unequal cost multipath routing. (int)

        :type node: dict
        :type network: str
        :type prefix_len: int
        :type kwargs: dict
        """
        interface = kwargs.get('interface', None)
        gateway = kwargs.get('gateway', None)

        try:
            net_addr = IPv6Address(unicode(network))
            af_inet = AF_INET6
            is_ipv6 = 1
        except (AddressValueError, NetmaskValueError):
            net_addr = IPv4Address(unicode(network))
            af_inet = AF_INET
            is_ipv6 = 0

        if gateway:
            try:
                gt_addr = IPv6Address(unicode(gateway))
                af_inet_gt = AF_INET6
            except (AddressValueError, NetmaskValueError):
                gt_addr = IPv4Address(unicode(gateway))
                af_inet_gt = AF_INET

        cmd = 'ip_add_del_route'
        args = dict(
            next_hop_sw_if_index=InterfaceUtil.get_interface_index(
                node, interface) if interface else Constants.BITWISE_NON_ZERO,
            table_id=int(kwargs.get('vrf', 0)),
            is_add=1,
            is_ipv6=is_ipv6,
            is_local=int(kwargs.get('local', False)),
            is_multipath=int(kwargs.get('multipath', False)),
            next_hop_weight=int(kwargs.get('weight', 1)),
            next_hop_proto=1 if is_ipv6 else 0,
            dst_address_length=int(prefix_len),
            next_hop_address=inet_pton(af_inet_gt, str(gt_addr)) if gateway
            else 0,
            next_hop_table_id=int(kwargs.get('lookup_vrf', 0)))
        err_msg = 'Failed to add route(s) on host {host}'.format(
            host=node['host'])
        with PapiExecutor(node) as papi_exec:
            for i in xrange(kwargs.get('count', 1)):
                papi_exec.add(cmd, dst_address=inet_pton(
                    af_inet, str(net_addr+i)), **args)
            papi_exec.get_replies(err_msg).verify_replies(err_msg=err_msg)

    @staticmethod
    def vpp_nodes_set_ipv4_addresses(nodes, nodes_addr):
        """Set IPv4 addresses on all VPP nodes in topology.

        :param nodes: Nodes of the test topology.
        :param nodes_addr: Available nodes IPv4 addresses.
        :type nodes: dict
        :type nodes_addr: dict
        :returns: Affected interfaces as list of (node, interface) tuples.
        :rtype: list
        """
        interfaces = []
        for net in nodes_addr.values():
            for port in net['ports'].values():
                host = port.get('node')
                if host is None:
                    continue
                topo = Topology()
                node = topo.get_node_by_hostname(nodes, host)
                if node is None:
                    continue
                if node['type'] != NodeType.DUT:
                    continue
                iface_key = topo.get_interface_by_name(node, port['if'])
                IPUtil.vpp_interface_set_ip_address(
                    node, iface_key, port['addr'], net['prefix'])
                interfaces.append((node, port['if']))

        return interfaces

    @staticmethod
    def flush_ip_addresses(node, interface):
        """Flush all IPv4addresses from specified interface.

        :param node: VPP node.
        :param interface: Interface name.
        :type node: dict
        :type interface: str
        """
        cmd = 'sw_interface_add_del_address'
        args = dict(
            sw_if_index=InterfaceUtil.get_interface_index(node, interface),
            del_all=1)
        err_msg = 'Failed to flush IP address on interface {ifc}'.format(
            ifc=interface)
        with PapiExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_replies(err_msg). \
                verify_reply(err_msg=err_msg)

    @staticmethod
    def add_fib_table(node, table_id, ipv6=False):
        """Create new FIB table according to ID.

        :param node: Node to add FIB on.
        :param table_id: FIB table ID.
        :param ipv6: Is this an IPv6 table
        :type node: dict
        :type table_id: int
        :type ipv6: bool
        """
        cmd = 'ip_table_add_del'
        args = dict(
            table_id=int(table_id),
            is_ipv6=int(ipv6),
            is_add=1)
        err_msg = 'Failed to add FIB table on host {host}'.format(
            host=node['host'])
        with PapiExecutor(node) as papi_exec:
            papi_exec.add(cmd, **args).get_replies(err_msg). \
                verify_reply(err_msg=err_msg)