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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.
"""Traffic profile for T-rex advanced stateful (astf) traffic generator.
Traffic profile:
- Two streams sent in directions 0 --> 1 (client -> server, requests) and
1 --> 0 (server -> client, responses) at the same time.
- Packet: ETH / IP / UDP
- Direction 0 --> 1:
- Source IP address range: 192.168.0.0 - 192.168.63.255
- Destination IP address range: 20.0.0.0 - 20.0.63.255
- Direction 1 --> 0:
- Source IP address range: destination IP address from packet received
on port 1
- Destination IP address range: source IP address from packet received
on port 1
"""
from trex.astf.api import *
from profile_trex_astf_base_class import TrafficProfileBaseClass
class TrafficProfile(TrafficProfileBaseClass):
"""Traffic profile."""
def __init__(self):
"""Initialization and setting of profile parameters."""
super(TrafficProfileBaseClass, self).__init__()
# IPs used in packet headers.
self.p1_src_start_ip = u"192.168.0.0"
self.p1_src_end_ip = u"192.168.63.255"
self.p1_dst_start_ip = u"20.0.0.0"
self.p1_dst_end_ip = u"20.0.63.255"
# UDP messages
self.udp_req = u"GET"
self.udp_res = u"ACK"
# Headers length
self.headers_size = 42 # 14B l2 + 20B ipv4 + 8B udp
# Required UDP keepalive value for T-Rex
self.udp_keepalive = 2000 # 2s (2,000 msec)
def define_profile(self):
"""Define profile to be used by advanced stateful traffic generator.
This method MUST return:
return ip_gen, templates, None
:returns: IP generator and profile templates ASTFProfile().
:rtype: tuple
"""
self.udp_req += self._gen_padding(self.headers_size + len(self.udp_req))
self.udp_res += self._gen_padding(self.headers_size + len(self.udp_res))
# client commands
prog_c = ASTFProgram(stream=False)
# set the keepalive timer for UDP flows to not close udp session
# immediately after packet exchange
prog_c.set_keepalive_msg(self.udp_keepalive)
# send REQ message
prog_c.send_msg(self.udp_req)
# receive RES message
prog_c.recv_msg(1)
# server commands
prog_s = ASTFProgram(stream=False)
# set the keepalive timer for UDP flows to not close udp session
# immediately after packet exchange
prog_c.set_keepalive_msg(self.udp_keepalive)
# receive REQ message
prog_s.recv_msg(1)
# send RES message
prog_s.send_msg(self.udp_res)
# ip generators
ip_gen_c = ASTFIPGenDist(
ip_range=[self.p1_src_start_ip, self.p1_src_end_ip],
distribution=u"seq"
)
ip_gen_s = ASTFIPGenDist(
ip_range=[self.p1_dst_start_ip, self.p1_dst_end_ip],
distribution=u"seq"
)
ip_gen = ASTFIPGen(
glob=ASTFIPGenGlobal(ip_offset=u"0.0.0.1"),
dist_client=ip_gen_c,
dist_server=ip_gen_s
)
# server association
s_assoc = ASTFAssociation(rules=ASTFAssociationRule(port=8080))
# template
temp_c = ASTFTCPClientTemplate(
program=prog_c,
ip_gen=ip_gen,
limit=1032192, # TODO: set via input parameter ?
port=8080
)
temp_s = ASTFTCPServerTemplate(program=prog_s, assoc=s_assoc)
template = ASTFTemplate(client_template=temp_c, server_template=temp_s)
return ip_gen, template, None
def register():
"""Register this traffic profile to T-Rex.
Do not change this function.
:return: Traffic Profiles.
:rtype: Object
"""
return TrafficProfile()
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