# Copyright (c) 2021 Cisco and/or its affiliates.
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# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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#     http://www.apache.org/licenses/LICENSE-2.0
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"""Stream profile for T-rex traffic generator.

Stream profile:
 - Two streams sent in directions 0 --> 1 and 1 --> 0 at the same time.
 - Direction 0 --> 1:
   - Packet: ETH / IP
   - Source IP address range:            10.128.1.0 - 10.129.0.255
   - Destination IP address range:       10.0.1.0 - 10.1.0.255
 - Direction 1 --> 0:
   - Packet: ETH / IP / UDP / GENEVE / ETH / IP
   - Outer Source IP address range:      1.1.1.1
   - Outer Destination IP address range: 1.1.1.2
   - Inner Source IP address range:      10.0.1.0 - 10.1.0.255
   - Inner Destination IP address range: 10.128.1.0 - 10.129.0.255
   - Source UDP port range:              1024 - 65535
   - Destination UDP port range:         6081
"""

from ctypes import c_int
from ipaddress import IPv4Address

from scapy.contrib.geneve import GENEVE
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__()

        # Nr. of GENEVE tunnels
        self.n_tunnels = 256
        # VNIs used in GENEVE headers of Direction 1 --> 0.
        self.p2_geneve_start_vni = 1

        # IPs used in packet headers of Direction 0 --> 1.
        self.p1_src_start_ip = u"10.128.1.0"
        self.p1_dst_start_ip = u"10.0.1.0"

        # IPs used in packet headers of Direction 1 --> 0.
        self.p2_outer_src_ip = u"1.1.1.1"
        self.p2_outer_dst_ip = u"1.1.1.2"

        self.p2_inner_src_start_ip = u"10.0.1.0"
        self.p2_inner_dst_start_ip = u"10.128.1.0"

        # MACs used in inner ethernet header of Direction 1 --> 0.
        self.p2_inner_dst_mac = u"d0:0b:ee:d0:00:00"

        # UDP ports used in packet headers of Direction 1 --> 0.
        self.p2_udp_sport_start = 1024
        self.p2_udp_dport = 6081

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

        Packet definition: | ETH | IP | UDP |

        :returns: Packets to be sent from the traffic generator.
        :rtype: tuple
        """
        p1_src_start_ip_int = int(IPv4Address(self.p1_src_start_ip))
        p1_dst_start_ip_int = int(IPv4Address(self.p1_dst_start_ip))
        p2_inner_src_start_ip_int = int(IPv4Address(self.p2_inner_src_start_ip))
        p2_inner_dst_start_ip_int = int(IPv4Address(self.p2_inner_dst_start_ip))

        # Direction 0 --> 1
        base_pkt_a = (
            Ether() /
            IP(
                src=self.p1_src_start_ip,
                dst=self.p1_dst_start_ip,
                proto=61
            )
        )
        # Direction 1 --> 0
        base_pkt_b = (
            Ether() /
            IP(
                src=self.p2_outer_src_ip,
                dst=self.p2_outer_dst_ip,
                proto=17
            ) /
            UDP(
                sport=self.p2_udp_sport_start,
                dport=self.p2_udp_dport
            ) /
            GENEVE(vni=self.p2_geneve_start_vni) /
            Ether(dst=self.p2_inner_dst_mac) /
            IP(
                src=self.p2_inner_src_start_ip,
                dst=self.p2_inner_dst_start_ip,
                proto=61
            )
        )
        base_pkt_b /= Raw(load=self._gen_payload(110 - len(base_pkt_b)))
        # Direction 0 --> 1
        vm1 = STLScVmRaw(
            [
                STLVmFlowVar(
                    name=u"ip_src",
                    min_value=p1_src_start_ip_int,
                    max_value=p1_src_start_ip_int + self.n_tunnels * 256 - 1,
                    size=4,
                    op=u"inc"
                ),
                STLVmWrFlowVar(
                    fv_name=u"ip_src",
                    pkt_offset=u"IP.src"
                ),
                STLVmFlowVar(
                    name=u"ip_dst",
                    min_value=p1_dst_start_ip_int,
                    max_value=p1_dst_start_ip_int + self.n_tunnels * 256 - 1,
                    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"ip",
                    min_value=0,
                    max_value=self.n_tunnels * 256 - 1,
                    size=4,
                    op=u"inc"
                ),
                STLVmWrMaskFlowVar(
                    fv_name=u"ip",
                    pkt_cast_size=4,
                    mask=0xffffffff,
                    add_value=p2_inner_src_start_ip_int,
                    pkt_offset=u"IP:1.src"
                ),
                STLVmWrMaskFlowVar(
                    fv_name=u"ip",
                    pkt_cast_size=4,
                    mask=0xffffffff,
                    add_value=p2_inner_dst_start_ip_int,
                    pkt_offset=u"IP:1.dst"
                ),
                STLVmWrMaskFlowVar(
                    fv_name=u"ip",
                    pkt_cast_size=2,
                    mask=0xffff,
                    add_value=self.p2_udp_sport_start,
                    pkt_offset=u"UDP.sport"
                ),
                STLVmWrMaskFlowVar(
                    fv_name=u"ip",
                    pkt_cast_size=4,
                    mask=0xffffff00,
                    add_value=(self.p2_geneve_start_vni << 8),
                    pkt_offset=u"GENEVE.vni"
                ),
                STLVmWrMaskFlowVar(
                    fv_name=u"ip",
                    pkt_cast_size=4,
                    mask=0xffffff,
                    shift=-8,
                    offset_fixup=2,
                    add_value=c_int(
                        int(
                            self.p2_inner_dst_mac.replace(u":", u"")[6:12], 16
                        ) << 8
                    ).value,
                    pkt_offset=u"Ether:1.dst"
                ),
                STLVmFixIpv4(
                    offset=u"IP:1"
                ),
                STLVmFixIpv4(
                    offset=u"IP"
                ),
                STLVmFixChecksumHw(
                    l3_offset=u"IP",
                    l4_offset=u"UDP",
                    l4_type=CTRexVmInsFixHwCs.L4_TYPE_UDP
                )
            ]
        )

        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()