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from trex_stl_lib.api import *
def generate_payload(length):
word = ''
alphabet_size = len(string.ascii_letters)
for i in range(length):
word += string.ascii_letters[(i % alphabet_size)]
return word
class STLS1(object):
def create_stream (self):
fsize_no_fcs = 129
base_pkt_a = Ether()/IP(dst="48.0.0.1",options=IPOption(b'\x01\x01\x01\x00'))/UDP(dport=12,sport=1025)
vm1 = STLScVmRaw([
STLVmFlowVar(name="src",min_value="16.0.0.1",max_value="16.0.0.10",size=4,op="inc"),
STLVmWrFlowVar(fv_name="src",pkt_offset= "IP.src"),
# checksum
STLVmFixIpv4(offset = "IP")
]
) # split to cores base on the tuple generator
#
pkt_a = STLPktBuilder(pkt=base_pkt_a/generate_payload(fsize_no_fcs-len(base_pkt_a)), vm=vm1)
return STLStream( packet = pkt_a ,
mode = STLTXCont() )
def get_streams (self, direction = 0, **kwargs):
# create 1 stream
return [ self.create_stream() ]
# dynamic load - used for trex console or simulator
def register():
return STLS1()
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