Can you make the following change to ipv4.py and see if this fixes it?
~line 76 - self.id = int(time.time()) + self.id = int(time.time()) & 0xffff On Wed, Apr 25, 2012 at 9:40 PM, Weiyang Mo <[email protected]> wrote: > I am sorry it still doesn't work. I checked the code and I think the > problems happen in the first few lines where I set IP packet attributes. > > Here is the complete error message: (It seems there's a problem in > ipv4_packet.csum = ipv4_packet.checksum(), even I delete this line, same > errors) > > Traceback (most recent call last): > File "./nox/lib/util.py", line 114, in f > event.total_len, buffer_id, packet) > File "./nox/coreapps/examples/sendIPV4.py", line 89, in packet_in_callback > self.learn_and_forward(dpid, inport, packet, packet.arr, bufid) > File "./nox/coreapps/examples/sendIPV4.py", line 53, in learn_and_forward > ipv4_packet.csum = ipv4_packet.checksum() > File "./nox/lib/packet/ipv4.py", line 162, in checksum > self.dstip) > error: 'H' format requires 0 <= number <= 65535 > Thanks > > Weiyang > 2012/4/25 Aaron Rosen <[email protected]> >> >> I believe if you do ipstr_to_int("10.0.0.3") it should work. >> >> Aaron >> >> >> On Wed, Apr 25, 2012 at 6:37 PM, Weiyang Mo <[email protected]> >> wrote: >> > Hi, >> > >> > I tested the code and view the packets in Wireshark. For ETH packets, >> > it >> > works. For IPV4, some errors when I complie it. >> > >> > (1) I tried ETH packets and the host can receive the packets. >> > eth_packet= ethernet() >> > eth_packet.set_payload(str("hello")) >> > eth_packet.dst = packet.dst >> > eth_packet.src = packet.src >> > eth_packet.type = ethenet.IP_TYPE >> > >> > self.send_openflow_packet(dpid,eth_packet.tostring(),inport) >> > >> > (2) I tried IPV4 and this time an error " "H" format requires >> > <=number<=65535 " , here's the following code >> > >> > ipv4_packet = ipv4() >> > payload = str("hello") >> > ipv4_packet.iplen = ipv4.MIN_LEN + len(payload) >> > ipv4_packet.set_payload(payload) >> > ipv4_packet.dstip = str("10.0.0.3") >> > ipv4_packet.srcip = str("192.168.56.102") >> > >> > eth_packet= ethernet() >> > eth_packet.set_payload(ipv4_packet) >> > packet.dst = packet.dst >> > eth_packet.src = packet.src >> > eth_packet.type = ethenet.IP_TYPE >> > ipv4_packet.csum = ipv4_packet.checksum() >> > >> > self.send_openflow_packet(dpid,ipv4_packet.tostring(),inport) >> > >> > I guess why it is failed maybe due to such line ipv4_packet.dstip >> > = str("10.0.0.3") is not acceptable. Or other reasons? >> > >> > Thanks very much. >> > >> > Weiyang >> > >> > >> > >> > >> > 2012/4/25 Aaron Rosen <[email protected]> >> >> >> >> Hi Weiyang, >> >> >> >> You can inject packets from the controller into the switch like this. >> >> Here is some code that I've used to send UDP packets from the >> >> controller to hosts. >> >> >> >> Aaron >> >> >> >> def send_udp(mac, dstip, srcip, port, payload): >> >> l4 = udp() >> >> l4.srcport = port >> >> l4.dstport = AGENT_MESSAGE_PORT >> >> l4.len = udp.MIN_LEN + len(payload) >> >> l4.set_payload(payload) >> >> l4.arr = l4.tostring() >> >> l3 = ipv4() >> >> l3.iplen = ipv4.MIN_LEN + l4.len >> >> l3.protocol = ipv4.UDP_PROTOCOL >> >> l3.dstip = dstip >> >> l3.srcip = srcip >> >> l3.set_payload(l4) >> >> l2 = ethernet() >> >> l2.set_payload(l3) >> >> l2.dst = mac >> >> l2.src = octstr_to_array(CONTROLLER_MAC) >> >> l2.type = ethernet.IP_TYPE >> >> l4.csum = l4.checksum() >> >> return l2 >> >> >> >> >> >> inform_dest = send_udp(mac, dstip, srcip, port, payload) >> >> inst.send_openflow_packet(HA, inform_dest.tostring(), >> >> inst.Agent[HA]['inport'], openflow.OFPP_NONE) >> >> >> >> >> >> On Wed, Apr 25, 2012 at 3:02 PM, Weiyang Mo <[email protected]> >> >> wrote: >> >> > Thanks very much for your quick reply. >> >> > >> >> > But I am still confused. do you mean that "the controller instruct a >> >> > switch >> >> > to send a packet" is not an OpenFlow feature? Or I misunderstand what >> >> > you >> >> > mean. >> >> > >> >> > I am sending packets from a client to a server through multiple >> >> > OpenFlow >> >> > switches. I already have this functionality that the controller >> >> > inserts >> >> > flow-entries and then the packets can be sent to the server. >> >> > >> >> > Now, I want to have another action that " when the controller >> >> > receives >> >> > the >> >> > first packet-in message, it can instruct a switch to send a packet >> >> > which >> >> > contains some data(e.g, hello). And this new packet can be sent to >> >> > another >> >> > host. If so, the host can run other applications automatically upon >> >> > receving >> >> > the packet "hello". >> >> > >> >> > Is it possible?( Packet in->controller controller-> instrucrt >> >> > the >> >> > switch to create a new packet new packet(Hello) ->host). How >> >> > should >> >> > I >> >> > write the pseudo code. >> >> > >> >> > Thanks >> >> > >> >> > Weiyang >> >> > >> >> > 2012/4/25 Murphy McCauley <[email protected]> >> >> >> >> >> >> There are no examples of this because this is not an OpenFlow >> >> >> feature >> >> >> -- >> >> >> only the controller can instruct a switch to send a packet. >> >> >> >> >> >> Unless maybe there is some vendor extension for some switches… >> >> >> >> >> >> -- Murphy >> >> >> >> >> >> On Apr 25, 2012, at 11:28 AM, Weiyang Mo wrote: >> >> >> >> >> >> BTW,any example code for this? For instance, the controller wishes >> >> >> to >> >> >> send >> >> >> a packet which contains the data "Hello" through the switch to the >> >> >> Output. >> >> >> >> >> >> How should I write the code? Is it like >> >> >> "actions=[openflow.ofp_packet_out, >> >> >> ...]" ? >> >> >> >> >> >> I am not clear because I don't find sample codes. Could anyone >> >> >> provides a >> >> >> simple sample code? >> >> >> >> >> >> Regards >> >> >> >> >> >> Weiyang >> >> >> ---------- Forwarded message ---------- >> >> >> From: Weiyang Mo <[email protected]> >> >> >> Date: 2012/4/25 >> >> >> Subject: instruct the swtich to create a new packet. >> >> >> To: [email protected] >> >> >> >> >> >> >> >> >> Hi,all, >> >> >> >> >> >> I want to insert an action in to flow entry. The action can tell the >> >> >> switch to create a new arbitary packet. What command should I use? >> >> >> >> >> >> Thanks a lot >> >> >> >> >> >> Weiyang >> >> >> >> >> >> >> >> > >> >> >> >> >> >> >> >> -- >> >> Aaron O. Rosen >> >> Masters Student - Network Communication >> >> 306B Fluor Daniel >> > >> > >> >> >> >> -- >> Aaron O. Rosen >> Masters Student - Network Communication >> 306B Fluor Daniel > > -- Aaron O. Rosen Masters Student - Network Communication 306B Fluor Daniel
