radiotapencap.cc

COPE the first practical network coding scheme which is developped on click

/*
 * radiotapencap.{cc,hh} -- encapsultates 802.11 packets
 * John Bicket
 *
 * Copyright (c) 2004 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 "radiotapencap.hh"
#include <click/etheraddress.hh>
#include <click/confparse.hh>
#include <click/error.hh>
#include <click/glue.hh>
#include <clicknet/wifi.h>
#include <click/packet_anno.hh>
#include <clicknet/llc.h>
#include <clicknet/radiotap.h>
CLICK_DECLS



#define CLICK_RADIOTAP_PRESENT (		\
	(1 << IEEE80211_RADIOTAP_RATE)		| \
	(1 << IEEE80211_RADIOTAP_DBM_TX_POWER)	| \
	(1 << IEEE80211_RADIOTAP_RTS_RETRIES)	| \
	(1 << IEEE80211_RADIOTAP_DATA_RETRIES)	| \
	0)

struct click_radiotap_header {
	struct ieee80211_radiotap_header wt_ihdr;
	u_int8_t	wt_rate;
	u_int8_t	wt_txpower;
	u_int8_t        wt_rts_retries;
	u_int8_t        wt_data_retries;
};






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

RadiotapEncap::~RadiotapEncap()
{
}

int
RadiotapEncap::configure(Vector<String> &conf, ErrorHandler *errh)
{

  _debug = false;
  if (cp_va_parse(conf, this, errh,
		  /* not required */
		  cpKeywords,
		  "DEBUG", cpBool, "Debug", &_debug,
		  cpEnd) < 0)
    return -1;
  return 0;
}

Packet *
RadiotapEncap::simple_action(Packet *p)
{

  WritablePacket *p_out = p->uniqueify();
  if (!p_out) {
    p->kill();
    return 0;
  }

  p_out = p_out->push(sizeof(struct click_radiotap_header));

  if (p_out) {
	  struct click_radiotap_header *crh  = (struct click_radiotap_header *) p_out->data();
	  click_wifi_extra *ceh = (click_wifi_extra *) p->all_user_anno();
	  
	  memset(crh, 0, sizeof(struct click_radiotap_header));
	  
	  crh->wt_ihdr.it_version = 0;
	  crh->wt_ihdr.it_len = sizeof(struct click_radiotap_header);
	  crh->wt_ihdr.it_present = CLICK_RADIOTAP_PRESENT;
	  
	  crh->wt_rate = ceh->rate;
	  crh->wt_txpower = ceh->power;
	  crh->wt_rts_retries = 0;
	  crh->wt_data_retries = ceh->max_tries - 1;
  }
  
  return p_out;
}


enum {H_DEBUG};

static String 
RadiotapEncap_read_param(Element *e, void *thunk)
{
  RadiotapEncap *td = (RadiotapEncap *)e;
    switch ((uintptr_t) thunk) {
      case H_DEBUG:
	return String(td->_debug) + "\n";
    default:
      return String();
    }
}
static int 
RadiotapEncap_write_param(const String &in_s, Element *e, void *vparam,
		      ErrorHandler *errh)
{
  RadiotapEncap *f = (RadiotapEncap *)e;
  String s = cp_uncomment(in_s);
  switch((int)vparam) {
  case H_DEBUG: {    //debug
    bool debug;
    if (!cp_bool(s, &debug)) 
      return errh->error("debug parameter must be boolean");
    f->_debug = debug;
    break;
  }
  }
  return 0;
}
 
void
RadiotapEncap::add_handlers()
{
  add_default_handlers(true);

  add_read_handler("debug", RadiotapEncap_read_param, (void *) H_DEBUG);

  add_write_handler("debug", RadiotapEncap_write_param, (void *) H_DEBUG);
}
CLICK_ENDDECLS
EXPORT_ELEMENT(RadiotapEncap)