how to use sniff() to get only inbound

[Tomino]

Hello,
I need to code sowftware switch, but I have a problem. When I send a packed
to specific interface, sniffing thread at that port will recieve it as
inbound packed, but that is wrong. It is possible to set sniff() to read
only inbound packets? Here is my code.

import threading
from scapy.all import *
port1 = "veth1000.0"
port2 = "veth1001.0"
def output(x, interface):
sendp(x, iface = interface)

def thr1():
sniff(iface = port1, prn = lambda x : output(x, port2))
def thr2():
sniff(iface = port2, prn = lambda x : output(x, port1))

t1 = threading.Thread(target = thr1 )
t2 = threading.Thread(target = thr2 )
t1.start()
t2.start()




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