ethermirror.cc

来自「COPE the first practical network coding 」· CC 代码 · 共 48 行

/*
 * ethermirror.{cc,hh} -- rewrites Ethernet packet a->b to b->a
 * Eddie Kohler
 *
 * Copyright (c) 2000 Massachusetts Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, subject to the conditions
 * listed in the Click LICENSE file. These conditions include: you must
 * preserve this copyright notice, and you cannot mention the copyright
 * holders in advertising related to the Software without their permission.
 * The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
 * notice is a summary of the Click LICENSE file; the license in that file is
 * legally binding.
 */

#include <click/config.h>
#include "ethermirror.hh"
#include <clicknet/ether.h>
CLICK_DECLS

EtherMirror::EtherMirror()
  : Element(1, 1)
{
}

EtherMirror::~EtherMirror()
{
}

Packet *
EtherMirror::simple_action(Packet *p)
{
  if (WritablePacket *q = p->uniqueify()) {
    click_ether *ethh = reinterpret_cast<click_ether *>(q->data());
    uint8_t tmpa[6];
    memcpy(tmpa, ethh->ether_dhost, 6);
    memcpy(ethh->ether_dhost, ethh->ether_shost, 6);
    memcpy(ethh->ether_shost, tmpa, 6);
    return q;
  } else
    return 0;
}

CLICK_ENDDECLS
EXPORT_ELEMENT(EtherMirror)