Hi Chitra,
this is what I understand
(this code snippet is from the unmodified hub.cc file)
ofp_flow_mod* ofm;
size_t size = sizeof *ofm + *sizeof(ofp_action_output); *//*
#1:* make this <N> * 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);
ofm->match.dl_vlan = flow.dl_vlan;
memcpy(ofm->match.dl_src, flow.dl_src.octet, sizeof
ofm->match.dl_src);
memcpy(ofm->match.dl_dst, flow.dl_dst.octet, sizeof
ofm->match.dl_dst);
ofm->match.dl_type = flow.dl_type;
ofm->match.nw_src = flow.nw_src;
ofm->match.nw_dst = flow.nw_dst;
ofm->match.nw_proto = flow.nw_proto;
ofm->match.tp_src = flow.tp_src;
ofm->match.tp_dst = flow.tp_dst;
ofm->command = htons(OFPFC_ADD);
ofm->buffer_id = htonl(buffer_id);
ofm->idle_timeout = htons(5);
ofm->hard_timeout = htons(5);
ofm->priority = htons(OFP_DEFAULT_PRIORITY);
ofm->reserved = htons(0);
*ofp_action_output& action = *((ofp_action_output*)ofm->actions);
/* change the above line to the one below..
* the idea is, pointers are arrays.. so now you can refer to
each of
* your action as action[0] ... action[N-1]
* once you make the change
*/ // change #2**
* *ofp_action_output* action = ((ofp_action_output*)ofm->actions);*
memset(&action, 0, *<N> * *sizeof(ofp_action_output)); *//
change #3*
action.type = htons(OFPAT_OUTPUT); *//
action[i].type change #4*
action.len = htons(sizeof(ofp_action_output)); *// action[i].len*
action.port = htons(OFPP_FLOOD); *//
action[i].port*
action.max_len = htons(0); *//
action[i].max_len*
send_openflow_command(pi.datapath_id, &ofm->header, true);
HTH
/varghese
Chitra Muthukrishnan wrote:
Hi,
In most of the examples that I see, the controller sends an
ofp_flow_mod instructing the switch to take 1 action for a rule.
I am wondering how to specify 2 actions for a rule. Do we just send
two messages- 1 for each action?
Or is there some other message format to specify 2 actions for a match?
-Chitra
On Thu, Oct 29, 2009 at 10:46 AM, kk yap <[email protected]
<mailto:[email protected]>> wrote:
Hi Chitra,
You have to construct a ofp_flow_mod message (specified in openflow.h)
and send it to the switch. In NOX, I typically use a boost shared
array to hold the message, then it is just a send_openflow_command. I
cannot find a very clean segment of code, but you can look at
routing.cc for try to follow through it.
Regards
KK
2009/10/29 Chitra Muthukrishnan <[email protected]
<mailto:[email protected]>>:
> I believe the controller can specify many actions to be taken
for a matching
> packet.
> I need a switch to send some packets to the controller and
forward it to an
> output port.
> Can someone tell me how we can construct such rules with nox?
>
> -Chitra
>
> _______________________________________________
> nox-dev mailing list
> [email protected] <mailto:[email protected]>
> http://noxrepo.org/mailman/listinfo/nox-dev_noxrepo.org
>
>
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