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from trex_stl_lib.api import *
class STLS1(object):
def __init__ (self):
self.max_pkt_size_l3 =9*1024;
def create_stream (self):
# pkt
p_l2 = Ether();
p_l3 = IP(src="16.0.0.1",dst="48.0.0.1")
p_l4 = UDP(dport=12,sport=1025)
pyld_size = max(0, self.max_pkt_size_l3 - len(p_l3/p_l4));
base_pkt = p_l2/p_l3/p_l4/('\x55'*(pyld_size))
l3_len_fix =-(len(p_l2));
l4_len_fix =-(len(p_l2/p_l3));
# vm
vm = CTRexScRaw( [ STLVmFlowVar(name="fv_rand", min_value=64, max_value=len(base_pkt), size=2, op="random"),
STLVmTrimPktSize("fv_rand"), # total packet size
STLVmWrFlowVar(fv_name="fv_rand", pkt_offset= "IP.len", add_val=l3_len_fix), # fix ip len
STLVmFixIpv4(offset = "IP"), # fix checksum
STLVmWrFlowVar(fv_name="fv_rand", pkt_offset= "UDP.len", add_val=l4_len_fix) # fix udp len
]
)
pkt = STLPktBuilder(pkt = base_pkt,
vm = vm)
return STLStream(packet = pkt,
mode = STLTXCont())
def get_streams (self, direction = 0):
# create 1 stream
return [ self.create_stream() ]
# dynamic load - used for trex console or simulator
def register():
return STLS1()
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