Looking at the wireshark trace, it looks as if the in_port on the match is
getting byte reversed. This is quite possibly a bug in the packing library;
byte ordering in NOX Classic is problematic.
Try flipping it:
ofm.match = flow.get_exact_match();
ofm.match.in_port = htons(ofm.match.in_port); // Swap bytes
You might also try turning up the verbosity for Open vSwitch and looking for
messages from it. I won't swear to it, but I'd think there's a decent chance
it would log something if it got a command with an invalid port number.
-- Murphy
On Mar 26, 2012, at 11:12 PM, 星言 墨虚 wrote:
> Dear all,
>
> Sorry to bother you.
>
> I am writing a NOX module whose name is router. It can be use as a router.
> But there are some questions that NOX cannot add flow entry to flow table in
> openvswitch through send_openflow_command.
>
> This is part of my code.
> // set up a new flow
> ofp_action_list act_list;
> ofp_action *act;
>
> act = new ofp_action();
> act->set_action_dl_addr(OFPAT_SET_DL_DST, ARPTable[RouteEntry.NextIPAddr]);
> act_list.action_list.push_back(*act);
> act = new ofp_action();
> act->set_action_output(RouteEntry.outPort, 0);
> act_list.action_list.push_back(*act);
>
> // set up new flow
> boost::shared_array<uint8_t> of_raw;
> size_t size = sizeof(ofp_flow_mod)+act_list.mem_size();
> of_raw.reset(new uint8_t[size]);
>
> of_flow_mod ofm;
> ofm.header = openflow_pack::header(OFPT_FLOW_MOD, size);
> ofm.match = flow.get_exact_match();
>
> ofm.cookie = htonl(0);
> ofm.command = htons(OFPFC_ADD);
> ofm.flags = htons(0);
> ofm.priority = htons(OFP_DEFAULT_PRIORITY);
> ofm.idle_timeout = htons(120);
> ofm.hard_timeout = htons(0);
> ofm.buffer_id = buffer_id;
>
> ofm.pack((ofp_flow_mod*) openflow_pack::get_pointer(of_raw));
> act_list.pack(openflow_pack::get_pointer(of_raw,sizeof(ofp_flow_mod)));
>
> lg.dbg("Install flow entry %s with %zu actions",
> flow.to_string().c_str(), act_list.action_list.size());
>
> send_openflow_command(datapath_id, of_raw, false);
>
> I run this code in nox(ip: 192.168.0.1) and send packet from host(ip:
> 192.168.57.1) to terminal(ip: 10.0.0.1), then nox show that flow has been
> installed successfully, packet has also been sent to terminal successfully
> and wiresharek can capture the OFP packet too, but openvswitch cannot add
> this flow to flow table.
>
> The attachment is capture file from wireshark.
>
> Thanks!
>
>
> <packet>
