Hi all,
I have recently started working with NOX development and I am facing problems
installing flows by NOX into switch table. I would like to install a flow to
forward UDP packets with a specific IP destination address (i.e. 192.168.0.1)
to controller. My problem is: I don't care about the others fields (vlanid,
port_in, dl_src, dl_dst and so on), so how should I fill the struct ofp_match?
My code is bellow:
ofp_flow_mod* ofm;
size_t size = sizeof *ofm + sizeof(ofp_action_output);
boost::shared_array<char> raw_of(new char[size]);
ofm = (ofp_flow_mod*) raw_of.get();
ofm->header.version = OFP_VERSION;
ofm->header.type = OFPT_FLOW_MOD;
ofm->header.length = htons(size);
ofm->header.xid = 0;
std::memset(&(ofm->match), 0, sizeof(struct ofp_match));
ofm->match.dl_type = ethernet::IP; /* IP Protocol*/
ofm->match.nw_proto = 0x11; /* UDP IP Protocol*/
ofm->match.nw_dst = inet_addr("192.168.0.1"); /* Dest. IP Addr */
ofm->cookie = htonl(0);
ofm->out_port = OFPP_NONE;
ofm->command = htons(OFPFC_ADD);
ofm->buffer_id = htonl(UINT32_MAX);
ofm->idle_timeout = htons(OFP_FLOW_PERMANENT);
ofm->hard_timeout = htons(OFP_FLOW_PERMANENT);
ofm->priority = htons(OFP_DEFAULT_PRIORITY);
ofm->flags = htons(ofd_flow_mod_flags());
ofp_action_output& action = *((ofp_action_output*) ofm->actions);
memset(&action, 0, sizeof(ofp_action_output));
action.type = htons(OFPAT_OUTPUT);
action.len = htons(sizeof(ofp_action_output));
action.port = htons(OFPP_CONTROLLER);
action.max_len = htons(ETH_DATA_LEN); /*Send up to 1500 bytes*/
send_openflow_command(dj.datapath_id, &ofm->header, true);
This code doesn't work. That packets are forwarded to controller but with
reason OFPR_NO_MATCH.
NOX message:
00637|my_program|INFO:handle_packet_in: A packet has been received (port: 1,
reason: 0, len=200, buf_size=128)
The output of "dpctl dump-flows" command:
#./dpctl dump-flows unix:/var/run/sp0.sock
stats_reply (xid=0xd14d1b1c): flags=none type=1(flow)
cookie=0, duration_sec=4s, duration_nsec=857000000s, table_id=0,
priority=65535, n_packets=0, n_bytes=0, idle_timeout=0, hard_timout=0, udp,
in_port=0, dl_vlan=0, dl_vlan_pcp=0, dl_src=00:00:00:00:00:00,
dl_dst=00:00:00:00:00:00,nw_src=0.0.0.0, nw_dst=192.168.0.1, nw_tos=0x00,
tp_src=0, tp_dst=0, actions=CONTROLLER:1500
I think the problem is the fields filled with ZERO. When I set the flow by
dpctl, it seems to work! But in this case I don't know how to specify max_len
and ZERO bytes are sent to controller.
#./dpctl add-flow unix:/var/run/dp0.sock
dl_type=0x0800,nw_proto=0x11,nw_dst=192.168.0.1,actions=CONTROLLER
#./dpctl dump-flows unix:/var/run/sp0.sock
stats_reply (xid=0x96173c8e): flags=none type=1(flow)
cookie=0, duration_src=2s, durations_nsec=800000000s, table_id=1,
priority=32768, n_packets=0, n_bytes=0, idle_timoue=60, hard_timout=0, upd,
nw_dst=192.168.0.1, actions=CONTROLLER:all
Unlike the flow installed by NOX, here I have the fields that were specified
only.
NOX messages:
00463|my_program|INFO:handle_packet_in: A packet has been received (port: 1,
reason: 1, len=200, buf_size=0)
00464|flow|ERR:Packet length 0 less than minimum Ethernet packet 14:
port0100:vlanffff:pcp:0 mac00:00:00:00:00:00->00:00:00:00:00:00 proto0000
ip0.0.0.0->0.0.0.0 port0->0
I would be very grateful for any help!
Best Regards,
Marcelo
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