On Wed, 01 Aug 2012 17:10:54 +0800, CHEN Fuyu <[email protected]>
wrote:
Hi, All,
I'm running the nox controller hub.cc which is from the nox source. How
to
set up the match field match.wildcards?
What I want to do, for example, is to set up a match rule for some
particular fields.
If I want the match field to be, for instance, in_port and eth_src, then
I
put
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->match.wildcards = htonl(0);
ofm->match.in_port = htons(flow.in_port);
memcpy(ofm->match.dl_src, flow.dl_src.octet, sizeof
ofm->match.dl_src);
ofm->match.dl_type = flow.dl_type;
ofm->cookie = htonl(0);
ofm->command = htons(OFPFC_ADD);
ofm->buffer_id = htonl(buffer_id);
ofm->idle_timeout = htons(OFP_FLOW_PERMANENT);
ofm->hard_timeout = htons(OFP_FLOW_PERMANENT);
ofm->priority = htons(OFP_DEFAULT_PRIORITY);
ofm->flags = htons(0);
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_FLOOD);
action.max_len = htons(0);
send_openflow_command(pi.datapath_id, &ofm->header, true);
However, from the wireshark output, it seems the switch are doing the
exact
match for all field, including the fields I didn't specify in the hub.cc,
all the packet will go to the controller, even the packet with the same
value of in_port, dl_type, dl_src with the previous packet.
If the modify the line to ofm->match.wildcards = 0xffffffff, then only
the
first packet will go to controller. If I didn't setup any value for
match.wildcards, it seems the same results as the case of 0xffffffff
So what value of wildcards I need to setup if I only some particular
field
to match?
Thanks.
Have you read the openflow spec? I think you should take a look at the
flow match structure section.
In your situation, if you would like match field to be in_port and eth_src,
you should set the wildcard flags on the others. Thus, setting
ofm->match.wildcards to (OFPFW_IN_PORT|OFPFW_DL_SRC)^OFPFW_ALL would be
satisfactory.
--
Regards,
Hunt
