tora_api.cc

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 *      Engineering Group at Lawrence Berkeley Laboratory.
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/* Ported from CMU/Monarch's code*/
/* 
   tora_api.cc
   $Id: tora_api.cc,v 1.3 1999/09/09 04:02:52 salehi Exp $
   
   Implement the API used by IMEP
   */


#include <tora/tora.h>

#define CURRENT_TIME    Scheduler::instance().clock()

void
toraAgent::rtNotifyLinkUP(nsaddr_t index)
{
    TORADest *td = dstlist.lh_first;

        /*
         * Update the destination lists...
         */
    for( ; td; td = td->link.le_next) {
        if(td->nb_find(index) == 0) {
                        (void) td->nb_add(index);
        }
        if (td->rt_req) 
          { // must send a new query for this dest so the new
            // neighbor can hear it
            // IMEP will take care of aggregating all these into
            // one physical pkt

            trace("T %.9f _%d_ QRY %d for %d (rtreq set)",
              Scheduler::instance().clock(), ipaddr(), 
              td->index, index);

            sendQRY(td->index);
            td->time_tx_qry = CURRENT_TIME;
        }
    }
}

void
toraAgent::rtNotifyLinkDN(nsaddr_t index)
{
    TORADest *td = dstlist.lh_first;

        /*
         *  Purge each Destination's Neighbor List
         */
        for( ; td; td = td->link.le_next) {
                if(td->nb_del(index)) {
                        /*
                         * Send an UPD packet if you've lost the last
                         * downstream link.
                         */
                        sendUPD(td->index);
                }
        }

    /*
     *  Now purge the Network Interface queues that
     *  may have packets destined for this broken
     *  neighbor.
     */
        {
                Packet *head = 0;
                Packet *p;
                Packet *np = 0;

                while((p = ifqueue->filter(index))) {
                        p->next_ = head;
                        head = p;
                }

                for(p = head; p; p = np) {
                        np = p->next_;
                        /*
                         * This make a lot of sense for TORA since we
                         * will almost always have multiple routes to
                         * a destination.
                         */
                        log_link_layer_recycle(p);
                        rt_resolve(p);
                }
        }
}


void
toraAgent::rtNotifyLinkStatus(nsaddr_t /* index */, u_int32_t /* status */)
{
    abort();
}

void
toraAgent::rtRoutePacket(Packet *p)
{
    struct hdr_cmn *ch = HDR_CMN(p);
    struct hdr_ip *ip = HDR_IP(p);

    // Non-data packets and BROADCAST packets can be dropped.
    if(DATA_PACKET(ch->ptype()) == 0 || 
       ip->daddr() == (nsaddr_t) IP_BROADCAST) {
        drop(p, DROP_RTR_MAC_CALLBACK);
        return;
    }

    rt_resolve(p);
}

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