def tunnel_listp(devname):
s = NetlinkSocket()
s.bind()
msg = ifinfmsg()
nonce = 123
# fill the protocol-specific fields
msg['index'] = 85 # index of the interface
msg['family'] = 18 # address family
# attach NLA -- it MUST be a list / mutable
msg['attrs'] = [['CTRL_ATTR_FAMILY_NAME', "gtp0"]]
# fill generic netlink fields
msg['header']['sequence_number'] = nonce # an unique seq number
msg['header']['pid'] = os.getpid()
msg['header']['type'] = GENL_ID_CTRL
msg['header']['flags'] = NLM_F_REQUEST |\
NLM_F_ACK
# encode the packet
msg.encode()
# send the buffer
s.sendto(msg.data, (0, 0))
s.get()
s.close()
l = 1
print("tthis is a list; {}".format(l))
return list
