sniffer.h

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/* Copyright (c) 2007 Axel Wachtler
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * 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.
   * Neither the name of the authors nor the names of its contributors
     may be used to endorse or promote products derived from this software
     without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   POSSIBILITY OF SUCH DAMAGE. */

/* $Id: sniffer_8h_source.html,v 1.1.1.4 2013/04/09 21:11:58 awachtler Exp $ */
/* === includes ============================================================ */
#include <avr/pgmspace.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>

#include <stdbool.h>
#include <util/crc16.h>
#include <avr/interrupt.h>
#include "transceiver.h"
#include "ioutil.h"
#include "timer.h"
#ifndef SNIFFER_H
#define SNIFFER_H

/* === macros ============================================================== */

#define SCAN_PERIOD_MS  (2000)
#define NL "\n"
#define CHANNEL_OFFSET(x)  (x > TRX_MAX_CHANNEL ? TRX_MIN_CHANNEL : (x - TRX_MIN_CHANNEL))
#define CHANNEL_MAX_OFFSET (TRX_NB_CHANNELS-1)
#define VERSION "0.1"

#define CHANNEL_NEXT_CIRCULAR(x) \
    do \
    { \
        (x)++; \
        if ((x) > TRX_MAX_CHANNEL) \
        { \
            (x) = TRX_MIN_CHANNEL; \
        } \
    } \
    while(0)


#ifndef MAX_PACKET_BUFFERS
# define MAX_PACKET_BUFFERS (8)
#endif
/* === types =============================================================== */
typedef enum
{
    IDLE,
    EDSCAN,
    SCAN,
    SCAN_DONE,
    SNIFF
} SHORTENUM sniffer_state_t;

typedef struct scan_result_tag
{
    uint16_t framecnt;
    uint16_t crc_ok;
    uint16_t edsum;
    uint16_t lqisum;
    uint16_t ftypes[8];
} scan_result_t;

typedef struct sniffer_context_tag
{
    volatile sniffer_state_t state;
    channel_t cchan;
    uint8_t cpage;
    uint32_t cmask;

    bool chkcrc;

    timer_hdl_t     thdl;
    time_t          scanper;
    scan_result_t   scanres[TRX_NB_CHANNELS];
    uint8_t         scanres_reset;
    uint16_t frames;
    uint16_t irq_ur;
    uint16_t missed_frames;
} sniffer_context_t;

typedef struct pcap_packet_tag
{
    uint8_t len;
    time_stamp_t ts;
    uint8_t frame[MAX_FRAME_SIZE];
} pcap_packet_t;


typedef struct pcap_pool_tag
{
    volatile uint8_t ridx;
    volatile uint8_t widx;
    pcap_packet_t packet[MAX_PACKET_BUFFERS];
} pcap_pool_t;


/* === externals =========================================================== */
extern sniffer_context_t ctx;

/* === inline functions ==================================================== */

static inline void scan_update_frame(uint8_t flen, bool crc_ok, uint8_t lqi, uint8_t ed, uint8_t *rxbuf)
{
scan_result_t *scres;

     scres = &ctx.scanres[(ctx.cchan - TRX_MIN_CHANNEL)];
     scres->framecnt ++;
     scres->edsum +=ed;
     scres->lqisum += lqi;

     if (flen < 0x80)
     {
         /* process valid frame length */
         if (crc_ok == true)
         {
             scres->crc_ok++;
             scres->ftypes[rxbuf[0]&7] ++;
         }
         /* parse beacon */
     }
}



/* === prototypes ========================================================== */
#ifdef __cplusplus
extern "C" {
#endif

void sniffer_start(sniffer_state_t state);
void sniffer_stop(void);
void ctrl_process_input(void);
void scan_init(void);
void scan_continue(void);
#ifdef __cplusplus
} /* extern "C" */
#endif

#endif  /* #ifndef SNIFFER_H */