uwtap.cpp

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//
// Copyright (c) 2021 Regents of the SIGNET lab, University of Padova.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Neither the name of the University of Padova (SIGNET lab) nor the
//    names of its contributors may be used to endorse or promote products
//    derived from this software without specific prior written permission.
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#include "uwtap.h"
#include "phymac-clmsg.h"
#include "uwtap_clmsg.h"
 
extern ClMessage_t CLMSG_TAP_PKT;
static class UwTapClass : public TclClass
{
public:
    UwTapClass()
        : TclClass("Module/UW/TAP")
    {
    }
    TclObject *
    create(int, const char *const *)
    {
        return (new UwTap());
    }
} class_uwtap;
 
int
UwTap::recvSyncClMsg(ClMessage *m)
{
    // TAP is supposed to be transparent to other layers
    if (m->direction() == DOWN) {
        sendSyncClMsgDown(m);
        return 0;
    } else if (m->direction() == UP) {
        sendSyncClMsgUp(m);
        return 0;
    }
 
    return 0;
}
 
void
UwTap::recv(Packet *p)
{
    hdr_cmn *ch = HDR_CMN(p);
    if (ch->direction() == hdr_cmn::UP) {
        // ch->timestamp() = NOW;
        ClMsgTapPkt msg = ClMsgTapPkt(
                p, clmsg_tap_type::END_RX, NOW, Tap2PhyTxDuration(p));
        sendSyncClMsg(&msg);
        sendUp(p);
    } else if (ch->direction() == hdr_cmn::DOWN) {
        // ch->txtime() = Tap2PhyTxDuration(p);
        ClMsgTapPkt msg = ClMsgTapPkt(
                p, clmsg_tap_type::START_TX, NOW, Tap2PhyTxDuration(p));
        sendSyncClMsg(&msg);
        sendDown(p);
    }
}
 
double
UwTap::Tap2PhyTxDuration(Packet *pkt)
{
    ClMsgMac2PhyGetTxDuration m(pkt);
    sendSyncClMsgDown(&m);
    return (m.getDuration());
}