Hi,
On 2015年04月05日 03:08, Николай Жупиков wrote:
> Hello! Please tell me how to extract the value of the field tcp_flags
> (openflow 1.5) using ryu.
> If possible, write example code.
Your question is how to extract the tcp_flags from packets (e.g. from packet-in
data), right?
If so, you can do it with "Packet Library".
e.g.)
from ryu.lib.packet import packet
from ryu.lib.packet import tcp
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
msg = ev.msg
pkt = packet.Packet(msg.data)
tcp_pkt = pkt.get_protocol(tcp.tcp)
if tcp_pkt is not None:
print 'tcp_pkt.bits = %d' % tcp_pkt.bits
The value of "bits" shows "Control Bits" of TCP header,
which is "The original TCP flags defined in RFC 793"(OF1.5 Spec).
Thanks
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