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# Copyright (c) 2024 Cisco and/or its affiliates.
#
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
# Licensed under the Apache License 2.0 or
# GNU General Public License v2.0 or later; you may not use this file
# except in compliance with one of these Licenses. You
# may obtain a copy of the Licenses at:
#
# http://www.apache.org/licenses/LICENSE-2.0
# https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
#
# Note: If this file is linked with Scapy, which is GPLv2+, your use of it
# must be under GPLv2+. If at any point in the future it is no longer linked
# with Scapy (or other GPLv2+ licensed software), you are free to choose
# Apache 2.
#
# 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:
- Packet: ETH / IP / UDP / GENEVE
"""
import ipaddress
from scapy.all import (
Packet, BitField, XShortField, ThreeBytesField, XByteField, Raw
)
from scapy.contrib.geneve import GENEVE
from scapy.layers.l2 import Ether
from scapy.layers.inet import IP, UDP
from scapy.layers.inet6 import IPv6
from trex.stl.api import *
from TrafficStreamsJsonClass import TrafficStreamsJsonClass
class Geneve(Packet):
"""Defines custom Geneve Class."""
name = "Geneve"
fields_desc = [
BitField("version", 0, 2),
BitField("optionlen", 0, 6),
BitField("oam", 0, 1),
BitField("critical", 0, 1),
BitField("reserved", 0, 6),
XShortField("proto", 0x6558),
ThreeBytesField("vni", 0),
XByteField("reserved2", 0x00)
]
class TrafficStreams(TrafficStreamsJsonClass):
"""Stream profile."""
def __init__(self):
"""Initialization and setting of streams' parameters."""
super(TrafficStreamsJsonClass, self).__init__()
def new_packet_header(self, key):
"""Define the packet modifications.
:returns: List of VMs to be sent from the traffic generator.
:rtype: list
"""
header_data = self.stream_data[key]
vm = []
for vm_entry in header_data:
value_list, size, offset = (
vm_entry["value-list"],
vm_entry["size"],
vm_entry["offset"]
)
# reserved mac address size is 8 bytes so fill the rest with zeros
if "mac" in vm_entry["name"]:
for i, value in enumerate(vm_entry["value-list"]):
value += ":00:00"
value_list[i] = int(value.lower().replace(':', ''), 16)
# replace only the second part of the IPv6 address
if "ip" in vm_entry["name"] and vm_entry["size"] == 16:
for i, value in enumerate(vm_entry["value-list"]):
value_list[i] = int.from_bytes(
ipaddress.IPv6Address(value).packed[8:],
byteorder="big"
)
size, offset = 8, offset + 8
vm.append(STLVmFlowVar(
name=vm_entry["name"],
value_list=value_list,
size=size,
op=vm_entry["op"]),
)
vm.append(STLVmWrFlowVar(
fv_name=vm_entry["name"],
pkt_offset=offset),
)
return vm
def define_packets(self):
"""Defines the packets to be sent from the traffic generator.
:returns: Base packets to be sent and transformation function.
:rtype: tuple
"""
base_pkt_data = self.stream_data["base-packet"]
base_pkt = (
Ether(
src=base_pkt_data["outer-eth"]["src"],
dst=base_pkt_data["outer-eth"]["dst"],
) /
IP(
src=base_pkt_data["outer-ip"]["src"],
dst=base_pkt_data["outer-ip"]["dst"],
) /
UDP(
sport=int(base_pkt_data["outer-udp"]["src"]),
dport=int(base_pkt_data["outer-udp"]["dst"]),
) /
GENEVE(
# proto = 0x86dd,
vni=base_pkt_data["encap-vni"],
)
)
if "inner-eth" in base_pkt_data:
base_pkt = base_pkt / (
Ether(
src=base_pkt_data["inner-eth"]["src"],
dst=base_pkt_data["inner-eth"]["dst"],
)
)
if ipaddress.ip_address(base_pkt_data["inner-ip"]["src"]).version == 6:
base_pkt = base_pkt / (
IPv6(
src=base_pkt_data["inner-ip"]["src"],
dst=base_pkt_data["inner-ip"]["dst"],
)
)
else:
base_pkt = base_pkt / (
IP(
src=base_pkt_data["inner-ip"]["src"],
dst=base_pkt_data["inner-ip"]["dst"],
)
)
base_pkt = base_pkt / (
UDP(
sport=int(base_pkt_data["inner-udp"]["src"]),
dport=int(base_pkt_data["inner-udp"]["dst"]),
)
)
length = self.stream_data["base-packet"]["length"]
pkt = base_pkt / Raw(load="X" * (length - len(base_pkt)))
outer_header_data = self.new_packet_header("outer-header")
if "inner-l2-header" in self.stream_data:
inner_header_data = self.new_packet_header("inner-l2-header")
else:
inner_header_data = self.new_packet_header("inner-l3-header")
vm = STLScVmRaw(outer_header_data + inner_header_data)
return pkt, vm
def register():
"""Register this traffic profile to T-Rex.
Do not change this function.
:return: Traffic streams.
:rtype: Object
"""
return TrafficStreams()
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