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# Copyright (c) 2023 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.
"""Base class for stream profiles for T-rex traffic generator.
"""
import socket
import struct
from random import choice
from string import ascii_letters
from trex.stl.api import *
class TrafficStreamsScaleClass:
"""Base class for stream profiles for T-rex traffic generator."""
STREAM_TABLE = {
"IMIX_v4": [
{"size": 60, "pps": 28, "isg": 0},
{"size": 590, "pps": 20, "isg": 0.1},
{"size": 1514, "pps": 4, "isg": 0.2}
],
"IMIX_v4_1": [
{"size": 64, "pps": 28, "isg": 0},
{"size": 570, "pps": 16, "isg": 0.1},
{"size": 1518, "pps": 4, "isg": 0.2}
]
}
def __init__(self):
# Default value of frame size, it will be overwritten by the value of
# "framesize" parameter of "get_streams" method.
self.framesize = 64
# If needed, add your own parameters.
def _gen_payload(self, length):
"""Generate payload.
If needed, implement your own algorithm.
:param length: Length of generated payload.
:type length: int
:returns: The generated payload.
:rtype: str
"""
payload = ""
for _ in range(length):
payload += choice(ascii_letters)
return payload
def _get_start_end_ipv6(self, start_ip, end_ip):
"""Get start host and number of hosts from IPv6 as integer.
:param start_ip: Start IPv6.
:param end_ip: End IPv6.
:type start_ip: string
:type end_ip: string
:return: Start host, number of hosts.
:rtype tuple of int
:raises: ValueError if start_ip is greater then end_ip.
:raises: socket.error if the IP addresses are not valid IPv6 addresses.
"""
try:
ip1 = socket.inet_pton(socket.AF_INET6, start_ip)
ip2 = socket.inet_pton(socket.AF_INET6, end_ip)
hi1, lo1 = struct.unpack("!QQ", ip1)
hi2, lo2 = struct.unpack("!QQ", ip2)
if ((hi1 << 64) | lo1) > ((hi2 << 64) | lo2):
raise ValueError("IPv6: start_ip is greater then end_ip")
return lo1, abs(int(lo1) - int(lo2))
except socket.error as err:
print(err)
raise
def define_packets(self):
"""Define the packets to be sent from the traffic generator.
This method MUST return:
return base_pkt_a, base_pkt_b, vm1, vm2
vm1 and vm2 CAN be None.
:returns: Packets to be sent from the traffic generator.
:rtype: tuple
"""
raise NotImplementedError
def create_streams(self):
"""Create traffic streams.
Implement your own traffic streams.
:returns: Traffic streams.
:rtype: list
"""
pkts, vms = self.define_packets()
# Frame size is defined as an integer, e.g. 64, 1518:
if isinstance(self.framesize, int):
pkt_streams = list()
lat_streams = list()
for i in range(len(pkts)):
payload_len = max(0, self.framesize - len(pkts[i]) - 4)
pkt = STLPktBuilder(
pkt=pkts[i] / self._gen_payload(payload_len),
vm=vms[i]
)
pkt_lat = STLPktBuilder(
pkt=pkts[i] / self._gen_payload(payload_len),
vm=vms[i]
)
pkt_streams.append(
STLStream(
packet=pkt,
isg=10.0 * (i // (len(pkts) // 2)),
mode=STLTXCont(pps=9000)
)
)
lat_streams.append(
STLStream(
packet=pkt_lat,
isg=10.0 * (i // (len(pkts) // 2)),
flow_stats=STLFlowLatencyStats(pg_id=i),
mode=STLTXCont(pps=9000)
)
)
streams = list()
streams.extend(pkt_streams)
streams.extend(lat_streams)
return streams
# Frame size is defined as a string, e.g.IMIX_v4_1:
elif isinstance(self.framesize, str):
pkt_streams = list()
for i in range(len(pkts)):
for stream in self.STREAM_TABLE[self.framesize]:
payload_len = max(0, stream["size"] - len(pkts[i]) - 4)
pkt = STLPktBuilder(
pkt=pkts[i] / self._gen_payload(payload_len),
vm=vms[i]
)
pkt_streams.append(
STLStream(
packet=pkt,
isg=stream["isg"],
mode=STLTXCont(pps=stream["pps"])
)
)
return pkt_streams
def get_streams(self, **kwargs):
"""Get traffic streams created by "create_streams" method.
If needed, add your own parameters.
:param kwargs: Key-value pairs used by "create_streams" method while
creating streams.
:returns: Traffic streams.
:rtype: list
"""
self.framesize = kwargs["framesize"]
self.rate = kwargs["rate"]
return self.create_streams()
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