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from trex_stl_lib.api import *
from scapy.contrib.mpls import * # import from contrib folder of scapy
class STLS1(object):
def __init__ (self):
pass;
def create_stream (self):
# 2 MPLS label the internal with s=1 (last one)
pkt = Ether()/MPLS(label=17,cos=1,s=0,ttl=255)/MPLS(label=0,cos=1,s=1,ttl=12)/IP(src="16.0.0.1",dst="48.0.0.1")/UDP(dport=12,sport=1025)/('x'*20)
vm = CTRexScRaw( [ STLVmFlowVar(name="mlabel", min_value=1, max_value=2000, size=2, op="inc"), # 2 bytes var
STLVmWrFlowVar(fv_name="mlabel", pkt_offset= "MPLS:1.label") # LABEL is 20 bits expected is val*8 as 3 LSB are off, 16,32,64 .. using new instruction it will be possible to write to any bits
]
)
# burst of 100 packets
return STLStream(packet = STLPktBuilder(pkt = pkt ,vm = vm),
mode = STLTXSingleBurst( pps = 1, total_pkts = 100) )
def get_streams (self, direction = 0):
# create 1 stream
return [ self.create_stream() ]
def register():
return STLS1()
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