text: /*
   * Copyright (c) 2009, Swedish Institute of Computer Science.
   * 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
   *
   */
  
  /**
   * \file
   *         MAC framer for IEEE 802.15.4
   * \author
   *         Niclas Finne <nfi@sics.se>
   *         Joakim Eriksson <joakime@sics.se>
   */
  
  #include "net/mac/framer-802154.h"
  #include "net/mac/frame802154.h"
  #include "net/packetbuf.h"
  #include "lib/random.h"
  #include <string.h>
  
  #define DEBUG 0
  
  #if DEBUG
  #include <stdio.h>
  #define PRINTF(...) printf(__VA_ARGS__)
  #define PRINTADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7])
  #else
  #define PRINTF(...)
  #define PRINTADDR(addr)
  #endif
  
  /**  \brief The sequence number (0x00 - 0xff) added to the transmitted
   *   data or MAC command frame. The default is a random value within
   *   the range.
   */
  static uint8_t mac_dsn;
  
  static uint8_t initialized = 0;
  
  /**  \brief The 16-bit identifier of the PAN on which the device is
   *   sending to.  If this value is 0xffff, the device is not
   *   associated.
   */
  static const uint16_t mac_dst_pan_id = IEEE802154_PANID;
  
  /**  \brief The 16-bit identifier of the PAN on which the device is
   *   operating.  If this value is 0xffff, the device is not
   *   associated.
   */
  static const uint16_t mac_src_pan_id = IEEE802154_PANID;
  
  /*---------------------------------------------------------------------------*/
  static int
  is_broadcast_addr(uint8_t mode, uint8_t *addr)
  {
    int i = mode == FRAME802154_SHORTADDRMODE ? 2 : 8;
    while(i-- > 0) {
      if(addr[i] != 0xff) {
        return 0;
      }
    }
    return 1;
  }
  /*---------------------------------------------------------------------------*/
  static int
  create(void)
  {
    frame802154_t params;
    int len;
  
    /* init to zeros */
    memset(&params, 0, sizeof(params));
  
    if(!initialized) {
      initialized = 1;
      mac_dsn = random_rand() & 0xff;
    }
  
    /* Build the FCF. */
    params.fcf.frame_type = FRAME802154_DATAFRAME;
    params.fcf.security_enabled = 0;
    params.fcf.frame_pending = packetbuf_attr(PACKETBUF_ATTR_PENDING);
    if(linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &linkaddr_null)) {
      params.fcf.ack_required = 0;
    } else {
      params.fcf.ack_required = packetbuf_attr(PACKETBUF_ATTR_MAC_ACK);
    }
    params.fcf.panid_compression = 0;
  
    /* Insert IEEE 802.15.4 (2003) version bit. */
    params.fcf.frame_version = FRAME802154_IEEE802154_2003;
  
    /* Increment and set the data sequence number. */
    if(packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO)) {
      params.seq = packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO);
    } else {
      params.seq = mac_dsn++;
      packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, params.seq);
    }
  /*   params.seq = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID); */
  
    /* Complete the addressing fields. */
    /**
       \todo For phase 1 the addresses are all long. We'll need a mechanism
       in the rime attributes to tell the mac to use long or short for phase 2.
    */
    if(sizeof(linkaddr_t) == 2) {
      /* Use short address mode if linkaddr size is short. */
      params.fcf.src_addr_mode = FRAME802154_SHORTADDRMODE;
    } else {
      params.fcf.src_addr_mode = FRAME802154_LONGADDRMODE;
    }
    params.dest_pid = mac_dst_pan_id;
  
    /*
     *  If the output address is NULL in the Rime buf, then it is broadcast
     *  on the 802.15.4 network.
     */
    if(linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &linkaddr_null)) {
      /* Broadcast requires short address mode. */
      params.fcf.dest_addr_mode = FRAME802154_SHORTADDRMODE;
      params.dest_addr[0] = 0xFF;
      params.dest_addr[1] = 0xFF;
  
    } else {
      linkaddr_copy((linkaddr_t *)&params.dest_addr,
                    packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
      /* Use short address mode if linkaddr size is small */
      if(sizeof(linkaddr_t) == 2) {
        params.fcf.dest_addr_mode = FRAME802154_SHORTADDRMODE;
      } else {
        params.fcf.dest_addr_mode = FRAME802154_LONGADDRMODE;
      }
    }
  
    /* Set the source PAN ID to the global variable. */
    params.src_pid = mac_src_pan_id;
  
    /*
     * Set up the source address using only the long address mode for
     * phase 1.
     */
    linkaddr_copy((linkaddr_t *)&params.src_addr, &linkaddr_node_addr);
  
    params.payload = packetbuf_dataptr();
    params.payload_len = packetbuf_datalen();
    len = frame802154_hdrlen(&params);
    if(packetbuf_hdralloc(len)) {
      frame802154_create(&params, packetbuf_hdrptr(), len);
  
      PRINTF("15.4-OUT: %2X", params.fcf.frame_type);
      PRINTADDR(params.dest_addr);
      PRINTF("%d %u (%u)\n\r", len, packetbuf_datalen(), packetbuf_totlen());
  
      return len;
    } else {
      PRINTF("15.4-OUT: too large header: %u\n\r", len);
      return FRAMER_FAILED;
    }
  }
  /*---------------------------------------------------------------------------*/
  static int
  parse(void)
  {
    frame802154_t frame;
    int len;
    len = packetbuf_datalen();
    if(frame802154_parse(packetbuf_dataptr(), len, &frame) &&
       packetbuf_hdrreduce(len - frame.payload_len)) {
      if(frame.fcf.dest_addr_mode) {
        if(frame.dest_pid != mac_src_pan_id &&
           frame.dest_pid != FRAME802154_BROADCASTPANDID) {
          /* Packet to another PAN */
          PRINTF("15.4: for another pan %u\n\r", frame.dest_pid);
          return FRAMER_FAILED;
        }
        if(!is_broadcast_addr(frame.fcf.dest_addr_mode, frame.dest_addr)) {
          packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, (linkaddr_t *)&frame.dest_addr);
        }
      }
      packetbuf_set_addr(PACKETBUF_ADDR_SENDER, (linkaddr_t *)&frame.src_addr);
      packetbuf_set_attr(PACKETBUF_ATTR_PENDING, frame.fcf.frame_pending);
      /*    packetbuf_set_attr(PACKETBUF_ATTR_RELIABLE, frame.fcf.ack_required);*/
      packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, frame.seq);
  
      PRINTF("15.4-IN: %2X", frame.fcf.frame_type);
      PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
      PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
      PRINTF("%u (%u)\n\r", packetbuf_datalen(), len);
  
      return len - frame.payload_len;
    }
    return FRAMER_FAILED;
  }
  /*---------------------------------------------------------------------------*/
  const struct framer framer_802154 = {
    create, parse
  };
  