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# Copyright (c) 2020 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.

"""Stream profile for T-rex traffic generator.

Stream profile:
 - Two streams sent in directions 0 --> 1 and 1 --> 0 at the same time.
 - Packet: ETH / IP /
 - Direction 0 --> 1:
   - Source MAC address range:      ca:fe:00:00:00:00 - ca:fe:00:00:13:87
   - Destination MAC address range: fa:ce:00:00:00:00 - fa:ce:00:00:13:87
   - Source IP address range:       10.0.0.0 - 10.0.19.135
   - Destination IP address range:  20.0.0.0 - 20.0.19.135
 - Direction 1 --> 0:
   - Source MAC address range:      fa:ce:00:00:00:00 - fa:ce:00:00:13:87
   - Destination MAC address range: ca:fe:00:00:00:00 - ca:fe:00:00:13:87
   - Source IP address range:       20.0.0.0 - 20.0.19.135
   - Destination IP address range:  10.0.0.0 - 10.0.19.135
"""

from trex.stl.api import *
from profile_trex_stateless_base_class import TrafficStreamsBaseClass


class TrafficStreams(TrafficStreamsBaseClass):
    """Stream profile."""

    def __init__(self):
        """Initialization and setting of streams' parameters."""

        super(TrafficStreamsBaseClass, self).__init__()

        self.clients = 5000

        # MACs used in packet headers.
        self.p1_src_start_mac = u"ca:fe:00:00:00:00" # mask: 00:00:FF:FF:FF:FF
        self.p1_dst_start_mac = u"fa:ce:00:00:00:00" # mask: 00:00:FF:FF:FF:FF

        self.p2_src_start_mac = u"fa:ce:00:00:00:00" # mask: 00:00:FF:FF:FF:FF
        self.p2_dst_start_mac = u"ca:fe:00:00:00:00" # mask: 00:00:FF:FF:FF:FF

        # IPs used in packet headers.
        self.p1_src_start_ip = u"10.0.0.0"
        self.p1_src_end_ip = u"10.0.19.135"

        self.p1_dst_start_ip = u"20.0.0.0"
        self.p1_dst_end_ip = u"20.0.19.135"

        self.p2_src_start_ip = u"20.0.0.0"
        self.p2_src_end_ip = u"20.0.19.135"

        self.p2_dst_start_ip = u"10.0.0.0"
        self.p2_dst_end_ip = u"10.0.19.135"

    def define_packets(self):
        """Defines the packets to be sent from the traffic generator.

        Packet definition: | ETH | IP |

        :returns: Packets to be sent from the traffic generator.
        :rtype: tuple
        """

        # Direction 0 --> 1
        base_pkt_a = (
            Ether(
                src=self.p1_src_start_mac,
                dst=self.p1_dst_start_mac
            ) /
            IP(
                src=self.p1_src_start_ip,
                dst=self.p1_dst_start_ip,
                proto=61
            )
        )
        # Direction 1 --> 0
        base_pkt_b = (
            Ether(
                src=self.p2_src_start_mac,
                dst=self.p2_dst_start_mac
            ) /
            IP(
                src=self.p2_src_start_ip,
                dst=self.p2_dst_start_ip,
                proto=61
            )
        )

        # Direction 0 --> 1
        vm1 = STLScVmRaw(
            [
                STLVmFlowVar(
                    name=u"mac_src",
                    min_value=0,
                    max_value=self.clients-1,
                    size=4,
                    op=u"inc"
                ),
                STLVmFlowVar(
                    name=u"mac_dst",
                    min_value=0,
                    max_value=self.clients-1,
                    size=4,
                    op=u"inc"
                ),
                STLVmWrFlowVar(
                    fv_name=u"mac_src",
                    pkt_offset= 8
                ),
                STLVmWrFlowVar(
                    fv_name=u"mac_dst",
                    pkt_offset= 2
                ),
                STLVmFlowVar(
                    name=u"ip_src",
                    min_value=self.p1_src_start_ip,
                    max_value=self.p1_src_end_ip,
                    size=4,
                    op=u"inc"
                ),
                STLVmWrFlowVar(
                    fv_name=u"ip_src",
                    pkt_offset=u"IP.src"
                ),
                STLVmFlowVar(
                    name=u"ip_dst",
                    min_value=self.p1_dst_start_ip,
                    max_value=self.p1_dst_end_ip,
                    size=4,
                    op=u"inc"
                ),
                STLVmWrFlowVar(
                    fv_name=u"ip_dst",
                    pkt_offset=u"IP.dst"
                ),
                STLVmFixIpv4(
                    offset=u"IP"
                )
            ]
        )
        # Direction 1 --> 0
        vm2 = STLScVmRaw(
            [
                STLVmFlowVar(
                    name=u"mac_src",
                    min_value=0,
                    max_value=self.clients-1,
                    size=4,
                    op=u"inc"
                ),
                STLVmFlowVar(
                    name=u"mac_dst",
                    min_value=0,
                    max_value=self.clients-1,
                    size=4,
                    op=u"inc"
                ),
                STLVmWrFlowVar(
                    fv_name=u"mac_src",
                    pkt_offset= 8
                ),
                STLVmWrFlowVar(
                    fv_name=u"mac_dst",
                    pkt_offset= 2
                ),
                STLVmFlowVar(
                    name=u"ip_src",
                    min_value=self.p2_src_start_ip,
                    max_value=self.p2_src_end_ip,
                    size=4,
                    op=u"inc"
                ),
                STLVmWrFlowVar(
                    fv_name=u"ip_src",
                    pkt_offset=u"IP.src"
                ),
                STLVmFlowVar(
                    name=u"ip_dst",
                    min_value=self.p2_dst_start_ip,
                    max_value=self.p2_dst_end_ip,
                    size=4,
                    op=u"inc"
                ),
                STLVmWrFlowVar(
                    fv_name=u"ip_dst",
                    pkt_offset=u"IP.dst"
                ),
                STLVmFixIpv4(
                    offset=u"IP"
                )
            ]
        )

        return base_pkt_a, base_pkt_b, vm1, vm2


def register():
    """Register this traffic profile to T-rex.

    Do not change this function.

    :return: Traffic streams.
    :rtype: Object
    """
    return TrafficStreams()