Hello Minoru,
Sorry for the delay, I was in a conference.
I used the code source that I have included for you in the previous message,
however I found the reason, I was using ping messages to test my application, I
suppose the ovs is encapsulating the ICMP packets into packets-in and sending
them to the controller. When my application performs the parsing and looks for
the TCP in the message, it cannot find it (because it is ICMP) and hence
produce the error, right?
I am working to implement a test based on TCP, I will let you know the new
updates.
Thanks and regards,
-----Message d'origine-----
De : Minoru TAKAHASHI [mailto:[email protected]]
Envoyé : mardi 25 novembre 2014 06:24
À : Salaheddine ZERKANE
Cc : [email protected]
Objet : Re: [Ryu-devel] TCP Flags in ryu
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-pac
> ket-parse
>
> Of course, this feature also supports tcp.
>
>
> http://ryu.readthedocs.org/en/latest/library_packet_ref.html#ryu.lib.p
> acket.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\\x
> 1a\\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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