Re: [Ryu-devel] IP packet handler

[<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
>>
>>