/* * decip6hlim.{cc,hh} -- element decrements IP6 packet's time-to-live * Peilei Fan * * Copyright (c) 1999-2000 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 "decip6hlim.hh"#include <clicknet/ip6.h>#include <click/glue.hh>CLICK_DECLSDecIP6HLIM::DecIP6HLIM()  : _drops(0){}DecIP6HLIM::~DecIP6HLIM(){}voidDecIP6HLIM::drop_it(Packet *p){  _drops++;  if (noutputs() == 2)    output(1).push(p);  else    p->kill();}inline Packet *DecIP6HLIM::simple_action(Packet *p_in){  assert(p_in->has_network_header());  const click_ip6 *ip_in = p_in->ip6_header();  if (ip_in->ip6_hlim <= 1) {    drop_it(p_in);    return 0;  } else {     WritablePacket *p = p_in->uniqueify();     click_ip6 *ip = p->ip6_header();     ip->ip6_hlim--;    return p;  }}static StringDecIP6HLIM_read_drops(Element *xf, void *){  DecIP6HLIM *f = (DecIP6HLIM *)xf;  return String(f->drops());}voidDecIP6HLIM::add_handlers(){  add_read_handler("drops", DecIP6HLIM_read_drops, 0);}CLICK_ENDDECLSEXPORT_ELEMENT(DecIP6HLIM)