vpp - Vector Packet Processing

# Copyright (c) 2018 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.

"""L2 Utilities Library."""

from textwrap import wrap

from robot.api.deco import keyword

from resources.libraries.python.topology import Topology
from resources.libraries.python.VatExecutor import VatExecutor, VatTerminal
from resources.libraries.python.ssh import exec_cmd_no_error


class L2Util(object):
    """Utilities for l2 configuration."""

    @staticmethod
    def mac_to_int(mac_str):
        """Convert MAC address from string format (e.g. 01:02:03:04:05:06) to
        integer representation (1108152157446).

        :param mac_str: MAC address in string representation.
        :type mac_str: str
        :returns: Integer representation of MAC address.
        :rtype: int
        """
        return int(mac_str.replace(':', ''), 16)

    @staticmethod
    def int_to_mac(mac_int):
        """Convert MAC address from integer representation (e.g. 1108152157446)
        to string format (01:02:03:04:05:06).

        :param mac_int: MAC address in integer representation.
        :type mac_int: int
        :returns: String representation of MAC address.
        :rtype: str
        """
        return ':'.join(wrap("{:012x}".format(mac_int), width=2))

    @staticmethod
    def vpp_add_l2fib_entry(node, mac, interface, bd_id):
        """ Create a static L2FIB entry on a vpp node.

        :param node: Node to add L2FIB entry on.
        :param mac: Destination mac address.
        :param interface: Interface name or sw_if_index.
        :param bd_id: Bridge domain id.
        :type node: dict
        :type mac: str
        :type interface: str or int
        :type bd_id: int
        """
        if isinstance(interface, basestring):
            sw_if_index = Topology.get_interface_sw_index(node, interface)
        else:
            sw_if_index = interface
        VatExecutor.cmd_from_template(node, "add_l2_fib_entry.vat",
                                      mac=mac, bd=bd_id,
                                      interface=sw_if_index)

    @staticmethod
    def create_l2_bd(node, bd_id, flood=1, uu_flood=1, forward=1, learn=1,
                     arp_term=0):
        """Create a l2 bridge domain on the chosen VPP node

        Execute "bridge_domain_add_del bd_id {bd_id} flood {flood} uu-flood 1
        forward {forward} learn {learn} arp-term {arp_term}" VAT command on
        the node.

        :param node: Node where we wish to crate the l2 bridge domain.
        :param bd_id: Bridge domain index number.
        :param flood: Enable flooding.
        :param uu_flood: Enable uu_flood.
        :param forward: Enable forwarding.
        :param learn: Enable mac address learning to fib.
        :param arp_term: Enable arp_termination.
        :type node: dict
        :type bd_id: int
        :type flood: bool
        :type uu_flood: bool
        :type forward: bool
        :type learn: bool
        :type arp_term: bool
        """
        VatExecutor.cmd_from_template(node, "l2_bd_create.vat",
                                      bd_id=bd_id, flood=flood,
                                      uu_flood=uu_flood, forward=forward,
                                      learn=learn, arp_term=arp_term)

    @staticmethod
    def add_interface_to_l2_bd(node, interface, bd_id, shg=0):
        """Add a interface to the l2 bridge domain.

        Get SW IF ID and add it to the bridge domain.

        :param node: Node where we want to execute the command that does this.
        :param interface: Interface name.
        :param bd_id: Bridge domain index number to add Interface name to.
        :param shg: Split horizon group.
        :type node: dict
        :type interface: str
        :type bd_id: int
        :type shg: int
        """
        sw_if_index = Topology.get_interface_sw_index(node, interface)
        L2Util.add_sw_if_index_to_l2_bd(node, sw_if_index, bd_id, shg)

    @staticmethod
    def add_sw_if_index_to_l2_bd(node, sw_if_index, bd_id, shg=0):
        """Add interface with sw_if_index to l2 bridge domain.

        Execute the "sw_interface_set_l2_bridge sw_if_index {sw_if_index}
        bd_id {bd_id} shg {shg} enable" VAT command on the given node.

        :param node: Node where we want to execute the command that does this.
        :param sw_if_index: Interface index.
        :param bd_id: Bridge domain index number to add SW IF ID to.
        :param shg: Split horizon group.
        :type node: dict
        :type sw_if_index: int
        :type bd_id: int
        :type shg: int
        """
        VatExecutor.cmd_from_template(node, "l2_bd_add_sw_if_index.vat",
                                      bd_id=bd_id, sw_if_index=sw_if_index,
                                      shg=shg)

    @staticmethod
    @keyword('Create dict used in bridge domain template file for node '
             '"${node}" with links "${link_names}" and bd_id "${bd_id}"')
    def create_bridge_domain_vat_dict(node, link_names, bd_id):
        """Create dictionary that can be used in l2 bridge domain template.

        The resulting dictionary looks like this:
        'interface1': interface name of first interface
        'interface2': interface name of second interface
        'bd_id': bridge domain index

        :param node: Node data dictionary.
        :param link_names: List of names of links the bridge domain should be
            connecting.
        :param bd_id: Bridge domain index number.
        :type node: dict
        :type link_names: list
        :returns: Dictionary used to generate l2 bridge domain VAT configuration
            from template file.
        :rtype: dict
        """
        bd_dict = Topology().get_interfaces_by_link_names(node, link_names)
        bd_dict['bd_id'] = bd_id
        return bd_dict

    @staticmethod
    def vpp_add_l2_bridge_domain(node, bd_id, port_1, port_2, learn=True):
        """Add L2 bridge domain with 2 interfaces to the VPP node.

        :param node: Node to add L2BD on.
        :param bd_id: Bridge domain ID.
        :param port_1: First interface name added to L2BD.
        :param port_2: Second interface name added to L2BD.
        :param learn: Enable/disable MAC learn.
        :type node: dict
        :type bd_id: int
        :type port_1: str
        :type port_2: str
        :type learn: bool
        """
        sw_if_index1 = Topology.get_interface_sw_index(node, port_1)
        sw_if_index2 = Topology.get_interface_sw_index(node, port_2)
        VatExecutor.cmd_from_template(node,
                                      'l2_bridge_domain.vat',
                                      sw_if_id1=sw_if_index1,
                                      sw_if_id2=sw_if_index2,
                                      bd_id=bd_id,
                                      learn=int(learn))

    @staticmethod
    def vpp_setup_bidirectional_cross_connect(node, interface1, interface2):
        """Create bidirectional cross-connect between 2 interfaces on vpp node.

        :param node: Node to add bidirectional cross-connect.
        :param interface1: First interface name or sw_if_index.
        :param interface2: Second interface name or sw_if_index.
        :type node: dict
        :type interface1: str or int
        :type interface2: str or int
        """

        if isinstance(interface1, basestring):
            sw_iface1 = Topology().get_interface_sw_index(node, interface1)
        else:
            sw_iface1 = interface1

        if isinstance(interface2, basestring):
            sw_iface2 = Topology().get_interface_sw_index(node, interface2)
        else:
            sw_iface2 = interface2

        with VatTerminal(node) as vat:
            vat.vat_terminal_exec_cmd_from_template('l2_xconnect.vat',
                                                    interface1=sw_iface1,
                                                    interface2=sw_iface2)
            vat.vat_terminal_exec_cmd_from_template('l2_xconnect.vat',
                                                    interface1=sw_iface2,
                                                    interface2=sw_iface1)

    @staticmethod
    def vpp_setup_bidirectional_l2_patch(node, interface1, interface2):
        """Create bidirectional l2 patch between 2 interfaces on vpp node.

        :param node: Node to add bidirectional l2 patch.
        :param interface1: First interface name or sw_if_index.
        :param interface2: Second interface name or sw_if_index.
        :type node: dict
        :type interface1: str or int
        :type interface2: str or int
        """

        if isinstance(interface1, basestring):
            sw_iface1 = Topology().get_interface_sw_index(node, interface1)
        else:
            sw_iface1 = interface1

        if isinstance(interface2, basestring):
            sw_iface2 = Topology().get_interface_sw_index(node, interface2)
        else:
            sw_iface2 = interface2

        with VatTerminal(node) as vat:
            vat.vat_terminal_exec_cmd_from_template('l2_patch.vat',
                                                    interface1=sw_iface1,
                                                    interface2=sw_iface2)
            vat.vat_terminal_exec_cmd_from_template('l2_patch.vat',
                                                    interface1=sw_iface2,
                                                    interface2=sw_iface1)

    @staticmethod
    def linux_add_bridge(node, br_name, if_1, if_2, set_up=True):
        """Bridge two interfaces on linux node.

        :param node: Node to add bridge on.
        :param br_name: Bridge name.
        :param if_1: First interface to be added to the bridge.
        :param if_2: Second interface to be added to the bridge.
        :param set_up: Change bridge interface state to up after create bridge.
            Optional. Default: True.
        :type node: dict
        :type br_name: str
        :type if_1: str
        :type if_2: str
        :type set_up: bool
        """
        cmd = 'brctl addbr {0}'.format(br_name)
        exec_cmd_no_error(node, cmd, sudo=True)
        cmd = 'brctl addif {0} {1}'.format(br_name, if_1)
        exec_cmd_no_error(node, cmd, sudo=True)
        cmd = 'brctl addif {0} {1}'.format(br_name, if_2)
        exec_cmd_no_error(node, cmd, sudo=True)
        if set_up:
            cmd = 'ip link set dev {0} up'.format(br_name)
            exec_cmd_no_error(node, cmd, sudo=True)

    @staticmethod
    def linux_del_bridge(node, br_name, set_down=True):
        """Delete bridge from linux node.

        ..note:: The network interface corresponding to the bridge must be
            down before it can be deleted!

        :param node: Node to delete bridge from.
        :param br_name: Bridge name.
        :param set_down: Change bridge interface state to down before delbr
            command. Optional. Default: True.
        :type node: dict
        :type br_name: str
        :type set_down: bool
        """
        if set_down:
            cmd = 'ip link set dev {0} down'.format(br_name)
            exec_cmd_no_error(node, cmd, sudo=True)
        cmd = 'brctl delbr {0}'.format(br_name)
        exec_cmd_no_error(node, cmd, sudo=True)

    @staticmethod
    def vpp_get_bridge_domain_data(node, bd_id=None):
        """Get all bridge domain data from a VPP node. If a domain ID number is
        provided, return only data for the matching bridge domain.

        :param node: VPP node to get bridge domain data from.
        :param bd_id: Numeric ID of a specific bridge domain.
        :type node: dict
        :type bd_id: int
        :returns: List of dictionaries containing data for each bridge domain,
            or a single dictionary for the specified bridge domain.
        :rtype: list or dict
        """
        with VatTerminal(node) as vat:
            response = vat.vat_terminal_exec_cmd_from_template("l2_bd_dump.vat")

        data = response[0]

        if bd_id is not None:
            for bridge_domain in data:
                if bridge_domain["bd_id"] == bd_id:

                    return bridge_domain

        return data

    @staticmethod
    def l2_vlan_tag_rewrite(node, interface, tag_rewrite_method,
                            push_dot1q=True, tag1_id=None, tag2_id=None):
        """Rewrite tags in ethernet frame.

        :param node: Node to rewrite tags.
        :param interface: Interface on which rewrite tags.
        :param tag_rewrite_method: Method of tag rewrite.
        :param push_dot1q: Optional parameter to disable to push dot1q tag
            instead of dot1ad.
        :param tag1_id: Optional tag1 ID for VLAN.
        :param tag2_id: Optional tag2 ID for VLAN.
        :type node: dict
        :type interface: str or int
        :type tag_rewrite_method: str
        :type push_dot1q: bool
        :type tag1_id: int
        :type tag2_id: int
        """
        push_dot1q = 'push_dot1q 0' if not push_dot1q else ''

        tag1_id = 'tag1 {0}'.format(tag1_id) if tag1_id else ''
        tag2_id = 'tag2 {0}'.format(tag2_id) if tag2_id else ''

        if isinstance(interface, basestring):
            iface_key = Topology.get_interface_by_name(node, interface)
            sw_if_index = Topology.get_interface_sw_index(node, iface_key)
        else:
            sw_if_index = interface

        with VatTerminal(node) as vat:
            vat.vat_terminal_exec_cmd_from_template("l2_vlan_tag_rewrite.vat",
                                                    sw_if_index=sw_if_index,
                                                    tag_rewrite_method=
                                                    tag_rewrite_method,
                                                    push_dot1q=push_dot1q,
                                                    tag1_optional=tag1_id,
                                                    tag2_optional=tag2_id)

    @staticmethod
    def delete_bridge_domain_vat(node, bd_id):
        """Delete the specified bridge domain from the node.

        :param node: VPP node to delete a bridge domain from.
        :param bd_id: Bridge domain ID.
        :type node: dict
        :type bd_id: int
        """

        with VatTerminal(node) as vat:
            vat.vat_terminal_exec_cmd_from_template(
                "l2_bridge_domain_delete.vat", bd_id=bd_id)

    @staticmethod
    def delete_l2_fib_entry(node, bd_id, mac):
        """Delete the specified L2 FIB entry.

        :param node: VPP node.
        :param bd_id: Bridge domain ID.
        :param mac: MAC address used as the key in L2 FIB entry.
        :type node: dict
        :type bd_id: int
        :type mac: str
        """

        with VatTerminal(node) as vat:
            vat.vat_terminal_exec_cmd_from_template("l2_fib_entry_delete.vat",
                                                    mac=mac,
                                                    bd_id=bd_id)

    @staticmethod
    def get_l2_fib_table_vat(node, bd_index):
        """Retrieves the L2 FIB table using VAT.

        :param node: VPP node.
        :param bd_index: Index of the bridge domain.
        :type node: dict
        :type bd_index: int
        :returns: L2 FIB table.
        :rtype: list
        """

        bd_data = L2Util.vpp_get_bridge_domain_data(node)
        bd_id = bd_data[bd_index-1]["bd_id"]

        try:
            with VatTerminal(node) as vat:
                table = vat.vat_terminal_exec_cmd_from_template(
                    "l2_fib_table_dump.vat", bd_id=bd_id)

            return table[0]
        except ValueError:
            return []

    @staticmethod
    def get_l2_fib_entry_vat(node, bd_index, mac):
        """Retrieves the L2 FIB entry specified by MAC address using VAT.

        :param node: VPP node.
        :param bd_index: Index of the bridge domain.
        :param mac: MAC address used as the key in L2 FIB data structure.
        :type node: dict
        :type bd_index: int
        :type mac: str
        :returns: L2 FIB entry
        :rtype: dict
        """

        table = L2Util.get_l2_fib_table_vat(node, bd_index)
        for entry in table:
            if entry["mac"] == mac:
                return entry
        return {}
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