sun-ipr-node-data.cpp

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//
// Copyright (c) 2021 Regents of the SIGNET lab, University of Padova.
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#include "sun-ipr-node.h"
 
extern packet_t PT_SUN_DATA;
extern packet_t PT_SUN_PATH_EST;
 
/* This function initialize a Data Packet passed as argument with the values
 * contained in the routing table.
 */
void
SunIPRoutingNode::initPktDataPacket(Packet *p)
{
    if (STACK_TRACE)
        std::cout << "> initPktDataPacket()" << std::endl;
 
    // Common header.
    hdr_cmn *ch = HDR_CMN(p);
    // ch->uid()       = 0; // Set by the Application above.
    // ch->ptype()     = 0; // Set by the Application above.
    // ch->size()      = 0; // Look Down;
    ch->direction() = hdr_cmn::DOWN;
    // ch->next_hop()  = 0; // This value must be set by the invoker.
    // ch->prev_hop_     = ipAddr_;
 
    // IP Header.
    hdr_uwip *iph = HDR_UWIP(p);
    iph->daddr() = sink_associated; // The destination is always the Sink associated.
    // iph->dport() = 0; // Set by the Application above.
    iph->saddr() = ipAddr_;
    // iph->sport() = 0; // Set by the Application above.
 
    // Path establishment header.
    hdr_sun_data *hdata = HDR_SUN_DATA(p);
    hdata->list_of_hops_length() = this->getNumberOfHopToSink() - 1;
    for (int i = 0; i < hop_table_length; i++) {
        hdata->list_of_hops()[i] = hop_table[i];
    }
    hdata->pointer() = 0;
 
    ch->size() += sizeof(hdr_sun_data);
    ch->timestamp() = Scheduler::instance().clock();
} /* SunIPRoutingNode::initPktDataPacket */
 
/* Use this function only if the invoker is a node with hop_to_sink > 1,
 * otherwise: drop.
 * This function is used by a node to forward a data packet to the next hop.
 * All the information to route the packet are contained in the packet.
 */
void
SunIPRoutingNode::forwardDataPacket(Packet *p)
{
    if (STACK_TRACE)
        std::cout << "> forwardDataPacket()" << std::endl;
    hdr_cmn *ch = HDR_CMN(p);
    hdr_uwip *iph = HDR_UWIP(p);
    hdr_sun_data *hdata = HDR_SUN_DATA(p);
 
    if (hdata->list_of_hops_length() <= 0) { // Garbage Packet.
        drop(p, 1, DROP_DATA_HOPS_LENGTH_EQUALS_ZERO);
    } else if (hdata->list_of_hops_length() > 0) { // The current node acts as relay.
        int i_ = hdata->pointer();
        if (hdata->list_of_hops()[i_] == ipAddr_) { // If I'm the right next hop.
            if (this->getNumberOfHopToSink() == 1) { // Send to the sink.
                ch->next_hop() = sink_associated;
                ch->prev_hop_ = ipAddr_;
            } else { // Forward to the next node.
                ch->next_hop() = hdata->list_of_hops()[i_ + 1];
                ch->prev_hop_ = ipAddr_;
                hdata->pointer()++;
            }
 
            if (printDebug_ > 5) {
                std::cout << "[" <<  NOW
                          << "]::Node[IP:" << this->printIP(ipAddr_)
                          << "||hops:" << this->getNumberOfHopToSink()
                          << "]::PACKET::UID:" << ch->uid()
                          << "::SRC:" << printIP(iph->saddr())
                          << "::DST:" << printIP(iph->daddr())
                          << "::FORWARDED_TO:" << printIP(ch->next_hop())
                          << std::endl;
            }
 
            number_of_datapkt_++;
            number_of_pkt_forwarded_++;
            double delay_tx_ = this->getDelay(period_data_);
            pkt_tx_++;
            if (trace_)
                this->tracePacket(p, "FRWD_DTA");
            sendDown(p, delay_tx_);
        } else {
            Packet::free(p);
        }
    }
} /* SunIPRoutingNode::forwardDataPacket */