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="10.0.0.1",max_value="10.0.0.10",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()