Hi,
> File "/home/ubuntu/ryu/ryu/lib/packet/packet.py", line 96, in get_protocols
> assert issubclass(protocol, packet_base.PacketBase)
The above error, which means that "tcp.tcp" is not an instance of the following
class.
ryu/lib/packet/tcp.py: class tcp (packet_base.PacketBase):
Hmm, can you check if there is any error in the import of tcp.tcp?
or
If possible, could you show me all of the source code?
On 2014年11月21日 22:59, Salaheddine ZERKANE wrote:
> Hello Minoru,
> Thank you very much for your insights and support.
> I wanted to test a TCP parser on packet in events, the code I used is :
> class Test(app_manager.RyuApp):
> def __init__(self, *args, **kwargs):
> super(Test, self).__init__(*args, **kwargs)
> @set_ev_cls(ofp_event.EventOFPPacketIn)
> def packet_in_TCP_Parser(self,ev):
> msg = ev.msg
> datapath = msg.datapath
> ofproto = datapath.ofproto
> bin_packet = msg.data
> pkt = Packet(data=bin_packet)
> pkt_tcp = pkt.get_protocol(tcp.tcp)
> FlagsTCP = pkt_TCP.bits
> self.logger.info("les drapeaux tcp sont %s" % (FlagsTCP,))
>
> However, got the following error : AssertionError
> File "/home/ubuntu/ryu/ryu/lib/hub.py", line 52, in _launch
> func(*args, **kwargs)
> File "/home/ubuntu/ryu/ryu/base/app_manager.py", line 274, in _event_loop
> handler(ev)
> File "/home/ubuntu/ryu/ryu/Test.py", line 22, in packet_in_TCP_Parser
> pkt_tcp = pkt.get_protocol(tcp.tcp)
> File "/home/ubuntu/ryu/ryu/lib/packet/packet.py", line 103, in get_protocol
> result = self.get_protocols(protocol)
> File "/home/ubuntu/ryu/ryu/lib/packet/packet.py", line 96, in get_protocols
> assert issubclass(protocol, packet_base.PacketBase)
> AssertionError
>
> Could please help me to resolve the error?
> Thanks and regards,
>
> -----Message d'origine-----
> De : Minoru TAKAHASHI [mailto:[email protected]]
> Envoyé : jeudi 20 novembre 2014 03:05
> À : Salaheddine ZERKANE; [email protected]
> Objet : Re: [Ryu-devel] TCP Flags in ryu
>
> On 2014年11月19日 21:20, Salaheddine ZERKANE wrote:
>> Hello,
>>
>> I am a phd student working in SDN security and new in RYU, Could you please
>> help me to find out if it is possible to create rules in RYUusing matching
>> on TCP Flags such as : RST, FIN, SYNAck, etc. and if RYUsupports a parsing
>> of packet-in by thesetcpflags? If it is the case how please?
>
>> RST, FIN, SYNAck, etc. and if RYUsupports a parsing of packet-in by
>> thesetcpflags?
> Is possible.
> Ryu can generate a corresponding python object from a sequence of bytes of
> the packet. The following URL has describes how to use.
>
>
> http://osrg.github.io/ryu-book/en/html/packet_lib.html#analysis-of-packet-parse
>
> Of course, this feature also supports tcp.
>
>
> http://ryu.readthedocs.org/en/latest/library_packet_ref.html#ryu.lib.packet.tcp.tcp
>
> And I wrote a simple sample code.
> Please try the following.
>
> sample.py
> -----------------------------------------------------------
> from ryu.lib.packet.packet import Packet from ryu.lib.packet import ethernet
> from ryu.lib.packet import tcp from ryu.lib.packet import ipv4 from
> ryu.lib.packet import packet_utils
>
> # Generation of Packets (Serialization)
> pkt = Packet()
> pkt.add_protocol(ethernet.ethernet(dst='22:22:22:22:22:22',
> src='12:11:11:11:11:11', ethertype=2048)) pkt.add_protocol(ipv4.ipv4(tos=32,
> proto=6, src='192.168.10.10', dst='192.168.20.20', ttl=64))
> pkt.add_protocol(tcp.tcp(dst_port=2222, bits=0b001100, option=str('\\x00' *
> 4), src_port=11111))
> pkt.add_protocol('\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\x08\\t\\n\\x0b\\x0c\\r\\x0e\\x0f\\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f')
>
> pkt.serialize()
> bin_packet = pkt.data
>
> # Analysis of Packet (Parse)
> pkt = Packet(data=bin_packet)
> pkt_tcp = pkt.get_protocol(tcp.tcp)
>
> print pkt_tcp
> # show TCP Flags (6bits)
> print pkt_tcp.bits
> -----------------------------------------------------------
>
> xxx@xxx:xxx/ryu/ $ python sample.py
> tcp(ack=0,bits=12,csum=57105,dst_port=2222,offset=9,option=bytearray(b'\\x00\\x00\\x00\\x00'),seq=0,src_port=11111,urgent=0,window_size=0)
> 12
>
> thanks
>
>>
>> Thanks and regards,
>>
>>
>>
>> *Meilleures salutations,*
>>
>> *Salaheddine ZERKANE*
>>
>>
>>
>> {P}
>>
>>
>>
>> Doctorant
>> Cubiq
>>
>> {T}
>>
>>
>>
>> +33 (0) 2 56 35 82 11
>>
>>
>>
>> http://signature.b-com.com/logo-bleu.gif <http://www.b-com.com/>
>>
>>
>>
>> ZAC DES CHAMPS BLANCS
>> BÂT. A · 13 RUE CLAUDE CHAPPE
>> 35510 CESSON-SÉVIGNÉ (FRance)
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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