AttributeError: _offset for STLPktBuilder in Trex
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Aharon Samuel
Feb 25, 2021, 1:47:34 AM2/25/21
to TRex Traffic Generator
Hi,
while I am trying to run standalone Trex Stateless Traffic without PyATS & Virtual Environment, I could run Trex STL traffic successfully. But with Python Virtual Environment and PyATS, Its failing during STL Packet Building.
I have tried the following option, still its failing
1. I have installed same scapy version as its in trex external_libs
File "/home/aharon/oracle/systest/lib/trex_lib.py", line 1412, in generate_stateless_udp_streams_per_subnet dst_port_start, dst_port_end, pkt_size, vlan_id ) File "/home/aharon/oracle/systest/lib/trex_lib.py", line 812, in create_udp_pkts pkt = STLPktBuilder(pkt = base_pkt/pad, vm = vm) File "/home/aharon/trex/v2.84/automation/trex_control_plane/interactive/trex/stl/trex_stl_packet_builder_scapy.py", line 1626, in __init__ self.compile() File "/home/aharon/trex/v2.84/automation/trex_control_plane/interactive/trex/stl/trex_stl_packet_builder_scapy.py", line 1789, in compile self._compile_raw(sc) File "/home/aharon/trex/v2.84/automation/trex_control_plane/interactive/trex/stl/trex_stl_packet_builder_scapy.py", line 2017, in _compile_raw desc.compile(self) File "/home/aharon/trex/v2.84/automation/trex_control_plane/interactive/trex/stl/trex_stl_packet_builder_scapy.py", line 1183, in compile t=parent._name_to_offset(self.pkt_offset) File "/home/aharon/trex/v2.84/automation/trex_control_plane/interactive/trex/stl/trex_stl_packet_builder_scapy.py", line 2062, in _name_to_offset return p_utl.get_field_offet_by_str(field_name) File "/home/aharon/trex/v2.84/automation/trex_control_plane/interactive/trex/stl/trex_stl_packet_builder_scapy.py", line 565, in get_field_offet_by_str return self.get_field_offet(layer,layer_cnt,field) File "/home/aharon/trex/v2.84/automation/trex_control_plane/interactive/trex/stl/trex_stl_packet_builder_scapy.py", line 463, in get_field_offet t=self._layer_offset(layer,layer_cnt); File "/home/aharon/trex/v2.84/automation/trex_control_plane/interactive/trex/stl/trex_stl_packet_builder_scapy.py", line 437, in _layer_offset print('Sam Debug: %s, %s' % (pkt, pkt._offset)) File "/home/aharon/trex_env/lib/python3.6/site-packages/scapy/packet.py", line 374, in __getattr__ return self.payload.__getattr__(attr) File "/home/aharon/trex_env/lib/python3.6/site-packages/scapy/packet.py", line 374, in __getattr__ return self.payload.__getattr__(attr) File "/home/aharon/trex_env/lib/python3.6/site-packages/scapy/packet.py", line 374, in __getattr__ return self.payload.__getattr__(attr) File "/home/aharon/trex_env/lib/python3.6/site-packages/scapy/packet.py", line 372, in __getattr__ fld, v = self.getfield_and_val(attr) File "/home/aharon/trex_env/lib/python3.6/site-packages/scapy/packet.py", line 1600, in getfield_and_val raise AttributeError(attr) AttributeError: _offset
2. I have uninstalled scapy in Virtual Environment and added scapy from external_libs in sys.path. Here STL Packet Building is successful, but Traffic is not happening. The TX & RX counters are Zeroes. I could see the following scapy warning messages.
2021-02-22T03:30:24: %SCAPY-WARNING: wrong value: DNS.qdcount=30840
wrong value: DNS.qdcount=30840
2021-02-22T03:30:24: %SCAPY-WARNING: wrong value: DNS.ancount=30840
wrong value: DNS.ancount=30840
2021-02-22T03:30:24: %SCAPY-WARNING: more wrong value: DNS.nscount=30840
more wrong value: DNS.nscount=30840
Ethernet:802.1Q:IP:UDP:DNS:Raw
Here is code snippet:
# Stateless
sys.path.append('/home/aharon/trex/v2.84/automation/trex_control_plane/interactive')
from trex_stl_lib.api import *
# hltapi
from trex.stl.api import *
from trex.stl.trex_stl_hltapi import *
from scapy.all import *
sys.path.append('/home/aharon/trex/v2.84/automation/trex_control_plane/interactive')
from trex_stl_lib.api import *
# hltapi
from trex.stl.api import *
from trex.stl.trex_stl_hltapi import *
from scapy.all import *
vm = STLScVmRaw(
[
STLVmFlowVar(name="ip_src",
min_value=src_ip_start,
max_value=src_ip_end,
size=4,op="inc", next_var="src_port" ),
STLVmWrFlowVar(fv_name="ip_src",pkt_offset= "IP.src"),
STLVmFlowVar(name="ip_dst",
min_value=dst_ip_start,
max_value=dst_ip_end,
size=4,op="inc"),
STLVmWrFlowVar(fv_name="ip_dst",pkt_offset= "IP.dst"),
STLVmFlowVar(name="src_port", min_value=src_port_start, max_value=src_port_end, size=2, op="inc" ),
STLVmWrFlowVar(fv_name="src_port", pkt_offset= "UDP.sport" ),
STLVmFlowVar(name="dst_port", min_value=dst_port_start, max_value=dst_port_end, size=2, op="inc" ),
STLVmWrFlowVar(fv_name="dst_port", pkt_offset= "UDP.dport" ),
STLVmFixIpv4(offset = "IP"),
STLVmFixChecksumHw(l3_offset="IP",l4_offset="UDP",l4_type=CTRexVmInsFixHwCs.L4_TYPE_UDP)
]
)
[
STLVmFlowVar(name="ip_src",
min_value=src_ip_start,
max_value=src_ip_end,
size=4,op="inc", next_var="src_port" ),
STLVmWrFlowVar(fv_name="ip_src",pkt_offset= "IP.src"),
STLVmFlowVar(name="ip_dst",
min_value=dst_ip_start,
max_value=dst_ip_end,
size=4,op="inc"),
STLVmWrFlowVar(fv_name="ip_dst",pkt_offset= "IP.dst"),
STLVmFlowVar(name="src_port", min_value=src_port_start, max_value=src_port_end, size=2, op="inc" ),
STLVmWrFlowVar(fv_name="src_port", pkt_offset= "UDP.sport" ),
STLVmFlowVar(name="dst_port", min_value=dst_port_start, max_value=dst_port_end, size=2, op="inc" ),
STLVmWrFlowVar(fv_name="dst_port", pkt_offset= "UDP.dport" ),
STLVmFixIpv4(offset = "IP"),
STLVmFixChecksumHw(l3_offset="IP",l4_offset="UDP",l4_type=CTRexVmInsFixHwCs.L4_TYPE_UDP)
]
)
if vlan_id is None:
base_pkt = Ether( src=src_mac, dst=dst_mac)/IP()/UDP()
else:
print('Vlan id = {}'.format(vlan_id))
print(src_mac, dst_mac)
base_pkt = Ether( src=src_mac, dst=dst_mac )/Dot1Q(vlan=vlan_id)/IP()/UDP()
base_pkt.show()
# Padding data to match the packet size ..
pad = max(0, len(base_pkt)-pkt_size) * 'x'
print('pad: %s' % pad)
pkt = STLPktBuilder(pkt = base_pkt/pad, vm = vm)
#print(pkt)
#print(type(pkt))
#sys.exit(1)
return pkt
base_pkt = Ether( src=src_mac, dst=dst_mac)/IP()/UDP()
else:
print('Vlan id = {}'.format(vlan_id))
print(src_mac, dst_mac)
base_pkt = Ether( src=src_mac, dst=dst_mac )/Dot1Q(vlan=vlan_id)/IP()/UDP()
base_pkt.show()
# Padding data to match the packet size ..
pad = max(0, len(base_pkt)-pkt_size) * 'x'
print('pad: %s' % pad)
pkt = STLPktBuilder(pkt = base_pkt/pad, vm = vm)
#print(pkt)
#print(type(pkt))
#sys.exit(1)
return pkt
(trex_env) -bash-4.2$ ls /home/aharon/trex/v2.84/external_libs/scapy-2.4.3/
LICENSE README.md ipfix-cisco-information-elements.csv ipfix-ietf-information-elements.csv scapy
(trex_env) -bash-4.2$ pip3.6 freeze | grep scapy
scapy==2.4.3
(trex_env) -bash-4.2$
Please suggest.
Thanks & Regards
Aharon
hanoh haim
Feb 25, 2021, 5:58:33 AM2/25/21
to Aharon Samuel, TRex Traffic Generator
Hi Aharon,
Trex has scapy with some more capabilities (e.g. to get offset of a field) but we have disabled the scapy capabilities to send packet (it only build packets, trex is sending them).
try to make sure you point to the right scapy.
Thanks
Hanoh
Aharon Samuel
Feb 25, 2021, 9:04:25 AM2/25/21
to hanoh haim, TRex Traffic Generator
Hi Hanoh,
Thank you for your reply.
I have uninstalled standard scapy in my virtual environment and importing scapy from external_libs of trex. With this, Trex traffic is not happening. All counters are zeroes
Thank you for your reply.
I have uninstalled standard scapy in my virtual environment and importing scapy from external_libs of trex. With this, Trex traffic is not happening. All counters are zeroes
This is the warning message I have seen
2021-02-22T03:30:24: %SCAPY-WARNING: wrong value: DNS.qdcount=30840 wrong value: DNS.qdcount=30840 2021-02-22T03:30:24: %SCAPY-WARNING: wrong value: DNS.ancount=30840 wrong value: DNS.ancount=30840 2021-02-22T03:30:24: %SCAPY-WARNING: more wrong value: DNS.nscount=30840 more wrong value: DNS.nscount=30840 Ethernet:802.1Q:IP:UDP:DNS:Raw
BTW, I am running Trex server in interactive mode in background.
nohup ./t-rex-64 -i -c 14 &
I would like to know any other packages should be installed on my setup.
—Aharon
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