Re: [Ryu-devel] IP packet handler

[<yam...@va...>]

> I tested your code but, even if I generate a RA using scapy, ryu doesn't go
> into the "if isinstance(data, icmpv6.nd_option_pi)"

sure, it should have been the following as your log says.

    if isinstance(data, icmpv6.nd_router_advert):

> 
> It seems like there is no instance for the nd_option_pi subclass...while I
> need to print the prefix value. Any hints?

seems like a parser bug.  i posted a fix.

YAMAMOTO Takashi

> 
> Thanks again!
> 
> Scapy code:
> a = IPv6()
> a.dst = "ff02::1"
> b = ICMPv6ND_RA()
> c = ICMPv6NDOptSrcLLAddr()
> c.lladdr = "00:00:00:00:00:01"
> d = ICMPv6NDOptMTU()
> e = ICMPv6NDOptPrefixInfo()
> e.prefixlen = 64
> e.prefix = "cc5f::"
> send(a/b/c/d/e)
> 
> #1 Ryu code:
> 
> icidata = icmpv6.icmpv6.data
>                 self.logger.info("[DATA] %s TYPE: %s", icidata,
> type(icidata))
>                 if isinstance(icidata, icmpv6.nd_option_pi):
>                         self.logger.info("[ALERT] I'm IN!")
>                 else:
>                         self.logger.info("[ALERT] I'm OUT! :(")
> 
> #1 LOG:
> [DATA]
> nd_router_advert(ch_l=0,data=[nd_option_la(data=None,hw_src='00:00:00:00:00:01'),
> '\x00\x00\x00\x00\x05\x00\x03\x04@\xc0\xff\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\x124\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'],length=[1,
> 1],rea_t=0,res=0,ret_t=0,rou_l=1800,type_=[1, 5]) TYPE: <class
> 'ryu.lib.packet.icmpv6.nd_router_advert'>
> [ALERT] I'm OUT! :(
> 
> -------------------------------
> 
> 2# Ryu code:
> icidata = icmpv6.icmpv6.data
>                 self.logger.info("[DATA] %s TYPE: %s", icidata,
> type(icidata))
>                 if isinstance(icidata, icmpv6.nd_router_advert):
>                         self.logger.info("[ALERT] I'm IN!")
>                 else:
>                         self.logger.info("[ALERT] I'm OUT! :(")
> 
> #2 LOG:
> [DATA]
> nd_router_advert(ch_l=0,data=[nd_option_la(data=None,hw_src='00:00:00:00:00:01'),
> '\x00\x00\x00\x00\x05\x00\x03\x04@\xc0\xff\xff\xff\xff\xff\xff\xff\xff\x00\x00\x00\x00\x124\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'],length=[1,
> 1],rea_t=0,res=0,ret_t=0,rou_l=1800,type_=[1, 5]) TYPE: <class
> 'ryu.lib.packet.icmpv6.nd_router_advert'>
> [ALERT] I'm IN!
> 
> 
> 2013/10/16 YAMAMOTO Takashi <yam...@va...>
> 
>> > Many thanks for your reply, now I've tried some tests and they work.
>> > Unfortunately, I'm experiencing another issue: I want my switch to
>> extract
>> > IPv6 ND informations, but the console reply back to me with this error
>> when
>> > I execute the following code (the omitted portion of code is the same of
>> > simple_switch.py example)
>> >
>> > [ERROR]
>> >  hub: uncaught exception: Traceback (most recent call last):
>> >   File "/home/user/ryu/ryu/lib/hub.py", line 48, in _launch
>> >     func(*args, **kwargs)
>> >   File "/home/user/ryu/ryu/base/app_manager.py", line 110, in _event_loop
>> >     handler(ev)
>> >   File "/home/user/ryu/ryu/app/simple_switch03BACKUP.py", line 68, in
>> > _packet_in
>> >     icimpv6 = pkt.get_protocol(icmpv6.nd_neighbor)
>> >   File "/home/user/ryu/ryu/lib/packet/packet.py", line 104, in
>> get_protocol
>> >     result = self.get_protocols(protocol)
>> >   File "/home/user/ryu/ryu/lib/packet/packet.py", line 97, in
>> get_protocols
>> >     assert issubclass(protocol, packet_base.PacketBase)
>> > AssertionError
>> >
>> >
>> > [CODE]
>> >
>> >
>> >  @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
>> >
>> > def _packet_in_handler(self, ev):
>> >
>> >     msg = ev.msg
>> >
>> >     datapath = msg.datapath
>> >
>> >     ofproto = datapath.ofproto
>> >
>> >
>> >     pkt = packet.Packet(msg.data)
>> >
>> >     eth = pkt.get_protocol(ethernet.ethernet)
>> >
>> >
>> >     dst = eth.dst
>> >
>> >     src = eth.src
>> >
>> >
>> >     try:
>> >
>> >         ippiv6 = pkt.get_protocol(ipv6.ipv6)
>> >
>> >         ipv6s = ippiv6.src
>> >
>> >     except:
>> >
>> >         ipv6s = "not assigned yet"
>> >
>> >
>> >     icimpv6 = pkt.get_protocol(icmpv6.icmpv6)
>> >
>> >     #icmpv6type = icimpv6.type_
>> >
>> >
>> >
>> >     options = pkt.get_protocol(icmpv6.nd_option_pi)
>>
>> i think you need something like this.
>>
>>     i = pkt.get_protocol(icmpv6.icmpv6)
>>     if i:
>>         data = i.data
>>         if isinstance(data, icmpv6.nd_option_pi):
>>             :
>>             :
>>
>> YAMAMOTO Takashi
>>
>> >
>> >     if (icmpv6type == 134):
>> >         prefixes = option.prefix
>> >
>> >         self.logger.info("[ALERT] packet contains a Router
>> Advertisement!")
>> >
>> >         self.logger.info("Prefix announced: %s", prefixes)
>> >
>> >
>> >
>> >     dpid = datapath.id
>> >
>> >     self.mac_to_port.setdefault(dpid, {})
>> >
>> >
>> >     self.logger.info("packet in %s ipv6:%s %s %s %s", dpid, ipv6s, src,
>> > dst, msg.in_port)
>> >
>> >
>> >     # learn a mac address to avoid FLOOD next time.
>> >
>> >     self.mac_to_port[dpid][src] = msg.in_port
>> >
>> >
>> > ...
>> >
>> > How can I fix this?
>> >
>> > Many thanks for your time
>> > Gabriele
>> >
>> >
>> > 2013/10/15 FUJITA Tomonori <fuj...@la...>
>> >
>> >> Hi,
>> >>
>> >> On Sun, 13 Oct 2013 15:58:14 +0200
>> >> Gabriele Gerbino <gab...@gm...> wrote:
>> >>
>> >> > Hi there, I'm new to this ML and to OF in general. I was trying to
>> gain
>> >> > confidence with ryu but I found myself stucked so soon. I wanted to
>> >> modify
>> >> > the "simple_switch.py" example in order to make it able to learn IP
>> >> > addresses too and handle packets based on them. In particular, my
>> idea is
>> >> > to use ryu to avoid some ipv6 security issues (rogue RA). Is there
>> anyone
>> >> > who can give me some instructions and/or examples of ip packet
>> handlers?
>> >>
>> >> I updated simple_switch.py. Packet library enables you to access an IP
>> >> header in a packet easily. Also check out:
>> >>
>> >> http://ryu.readthedocs.org/en/latest/library_packet_ref.html
>> >>
>> >>
>>