On Wed, Sep 09, 2015 at 06:29:39PM +0800, openvswitcher wrote:
> rule_dpif_lookup_in_table function:
>
>
> (...skip...)
>
>
> if (frag && ofproto->up.frag_handling == OFPC_FRAG_NORMAL) {
> /* We must pretend that transport ports are unavailable. */
> struct flow ofpc_normal_flow = *flow;
> ofpc_normal_flow.tp_src = htons(0);
> ofpc_normal_flow.tp_dst = htons(0);
> cls_rule = classifier_lookup(cls, &ofpc_normal_flow, wc);
> } else if (frag && ofproto->up.frag_handling == OFPC_FRAG_DROP) {
> cls_rule = &ofproto->drop_frags_rule->up.cr;
> /* Frag mask in wc already set above. */
> } else {
> cls_rule = classifier_lookup(cls, flow, wc);
> }
> (...skip...)
>
>
> Is this meaning if the frag_handling flag is set to OFPC_FRAG_DROP then all
> the packet with fragment IP header on will be dropped?
Yes.
> So the drop flow will be installed in kernel?
Yes.
> But I also see the default action is OFPC_FRAG_NORMAL, so I wonder in
> which case the OFPC_FRAG_DROP should be used?
When an OpenFlow controller configures OFPC_FRAG_DROP mode.
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