text: /*
   * Copyright (c) 2008, 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.
   *
   * This file is part of the Contiki operating system.
   *
   */
  
  
  /**
   * \file
   *         MAC interface for packaging radio packets into 802.15.4 frames
   *
   * \author
   *         Adam Dunkels <adam@sics.se>
   *         Eric Gnoske <egnoske@gmail.com>
   *         Blake Leverett <bleverett@gmail.com>
   *         Niclas Finne <nfi@sics.se>
   *         Joakim Eriksson <joakime@sics.se>
   */
  
  #include <string.h>
  #include "net/mac/sicslowmac.h"
  #include "net/mac/frame802154.h"
  #include "net/packetbuf.h"
  #include "net/queuebuf.h"
  #include "net/netstack.h"
  #include "lib/random.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;
  
  /**  \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 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 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 void
  send_packet(mac_callback_t sent, void *ptr)
  {
    frame802154_t params;
    uint8_t len;
  
    /* init to zeros */
    memset(&params, 0, sizeof(params));
  
    /* Build the FCF. */
    params.fcf.frame_type = FRAME802154_DATAFRAME;
    params.fcf.security_enabled = 0;
    params.fcf.frame_pending = 0;
    params.fcf.ack_required = packetbuf_attr(PACKETBUF_ATTR_RELIABLE);
    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. */
    params.seq = mac_dsn++;
  
    /* 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.
    */
    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(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &rimeaddr_null)) {
      /* Broadcast requires short address mode. */
      params.fcf.dest_addr_mode = FRAME802154_SHORTADDRMODE;
      params.dest_addr[0] = 0xFF;
      params.dest_addr[1] = 0xFF;
  
    } else {
      rimeaddr_copy((rimeaddr_t *)&params.dest_addr,
                    packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
      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.
     */
    rimeaddr_copy((rimeaddr_t *)&params.src_addr, &rimeaddr_node_addr);
  
    params.payload = packetbuf_dataptr();
    params.payload_len = packetbuf_datalen();
    len = frame802154_hdrlen(&params);
    if(packetbuf_hdralloc(len)) {
      int ret;
      frame802154_create(&params, packetbuf_hdrptr(), len);
  
      PRINTF("6MAC-UT: %2X", params.fcf.frame_type);
      PRINTADDR(params.dest_addr.u8);
      PRINTF("%u %u (%u)\n", len, packetbuf_datalen(), packetbuf_totlen());
  
      ret = NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen());
      if(sent) {
        switch(ret) {
        case RADIO_TX_OK:
          sent(ptr, MAC_TX_OK, 1);
          break;
        case RADIO_TX_ERR:
          sent(ptr, MAC_TX_ERR, 1);
          break;
        }
      }
    } else {
      PRINTF("6MAC-UT: too large header: %u\n", len);
    }
  }
  /*---------------------------------------------------------------------------*/
  void
  send_list(mac_callback_t sent, void *ptr, struct rdc_buf_list *buf_list)
  {
    if(buf_list != NULL) {
      queuebuf_to_packetbuf(buf_list->buf);
      send_packet(sent, ptr);
    }
  }
  /*---------------------------------------------------------------------------*/
  static void
  input_packet(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) {
          /* Not broadcast or for our PAN */
          PRINTF("6MAC: for another pan %u\n", frame.dest_pid);
          return;
        }
        if(!is_broadcast_addr(frame.fcf.dest_addr_mode, frame.dest_addr)) {
          packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, (rimeaddr_t *)&frame.dest_addr);
          if(!rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
                           &rimeaddr_node_addr)) {
            /* Not for this node */
            PRINTF("6MAC: not for us\n");
            return;
          }
        }
      }
      packetbuf_set_addr(PACKETBUF_ADDR_SENDER, (rimeaddr_t *)&frame.src_addr);
  
      PRINTF("6MAC-IN: %2X", frame.fcf.frame_type);
      PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
      PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
      PRINTF("%u\n", packetbuf_datalen());
      NETSTACK_MAC.input();
    } else {
      PRINTF("6MAC: failed to parse hdr\n");
    }
  }
  /*---------------------------------------------------------------------------*/
  static int
  on(void)
  {
    return NETSTACK_RADIO.on();
  }
  /*---------------------------------------------------------------------------*/
  static int
  off(int keep_radio_on)
  {
    if(keep_radio_on) {
      return NETSTACK_RADIO.on();
    } else {
      return NETSTACK_RADIO.off();
    }
  }
  /*---------------------------------------------------------------------------*/
  static void
  init(void)
  {
    mac_dsn = random_rand() % 256;
  
    NETSTACK_RADIO.on();
  }
  /*---------------------------------------------------------------------------*/
  static unsigned short
  channel_check_interval(void)
  {
    return 0;
  }
  /*---------------------------------------------------------------------------*/
  const struct rdc_driver sicslowmac_driver = {
    "sicslowmac",
    init,
    send_packet,
    send_list,
    input_packet,
    on,
    off,
    channel_check_interval
  };
  /*---------------------------------------------------------------------------*/
  