256 lines
8.1 KiB
C
256 lines
8.1 KiB
C
/*
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* Copyright (c) 2008, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: sicslowmac.c,v 1.3 2009/06/22 11:14:11 nifi Exp $
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*/
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/**
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* \file
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* MAC interface for packaging radio packets into 802.15.4 frames
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*
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* \author
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* Adam Dunkels <adam@sics.se>
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* Eric Gnoske <egnoske@gmail.com>
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* Blake Leverett <bleverett@gmail.com>
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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*/
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#include <string.h>
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#include "net/mac/sicslowmac.h"
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#include "net/mac/frame802154.h"
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#include "net/rime/packetbuf.h"
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#include "lib/random.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#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])
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#else
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#define PRINTF(...)
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#define PRINTADDR(addr)
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#endif
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/** \brief The sequence number (0x00 - 0xff) added to the transmitted
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* data or MAC command frame. The default is a random value within
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* the range.
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*/
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static uint8_t mac_dsn;
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/** \brief The 16-bit identifier of the PAN on which the device is
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* sending to. If this value is 0xffff, the device is not
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* associated.
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*/
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static uint16_t mac_dst_pan_id = IEEE802154_PANID;
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/** \brief The 16-bit identifier of the PAN on which the device is
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* operating. If this value is 0xffff, the device is not
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* associated.
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*/
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static uint16_t mac_src_pan_id = IEEE802154_PANID;
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static const struct radio_driver *radio;
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static void (* receiver_callback)(const struct mac_driver *);
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/*---------------------------------------------------------------------------*/
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static int
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is_broadcast_addr(uint8_t mode, uint8_t *addr)
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{
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int i = mode == FRAME802154_SHORTADDRMODE ? 2 : 8;
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while(i-- > 0) {
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if(addr[i] != 0xff) {
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return 0;
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}
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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send_packet(void)
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{
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frame802154_t params;
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uint8_t len;
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/* init to zeros */
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memset(¶ms, 0, sizeof(params));
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/* Build the FCF. */
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params.fcf.frame_type = FRAME802154_DATAFRAME;
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params.fcf.security_enabled = 0;
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params.fcf.frame_pending = 0;
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params.fcf.ack_required = packetbuf_attr(PACKETBUF_ATTR_RELIABLE);
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params.fcf.panid_compression = 0;
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/* Insert IEEE 802.15.4 (2003) version bit. */
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params.fcf.frame_version = FRAME802154_IEEE802154_2003;
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/* Increment and set the data sequence number. */
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params.seq = mac_dsn++;
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/* Complete the addressing fields. */
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/**
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\todo For phase 1 the addresses are all long. We'll need a mechanism
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in the rime attributes to tell the mac to use long or short for phase 2.
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*/
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params.fcf.src_addr_mode = FRAME802154_LONGADDRMODE;
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params.dest_pid = mac_dst_pan_id;
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/*
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* If the output address is NULL in the Rime buf, then it is broadcast
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* on the 802.15.4 network.
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*/
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if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &rimeaddr_null)) {
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/* Broadcast requires short address mode. */
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params.fcf.dest_addr_mode = FRAME802154_SHORTADDRMODE;
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params.dest_addr.u8[0] = 0xFF;
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params.dest_addr.u8[1] = 0xFF;
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} else {
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rimeaddr_copy(¶ms.dest_addr, packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
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params.fcf.dest_addr_mode = FRAME802154_LONGADDRMODE;
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}
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/* Set the source PAN ID to the global variable. */
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params.src_pid = mac_src_pan_id;
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/*
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* Set up the source address using only the long address mode for
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* phase 1.
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*/
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rimeaddr_copy(¶ms.src_addr, &rimeaddr_node_addr);
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params.payload = packetbuf_dataptr();
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params.payload_len = packetbuf_datalen();
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len = frame802154_hdrlen(¶ms);
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if(packetbuf_hdralloc(len)) {
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frame802154_create(¶ms, packetbuf_hdrptr(), len);
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PRINTF("6MAC-UT: %2X", params.fcf.frame_type);
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PRINTADDR(params.dest_addr.u8);
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PRINTF("%u %u (%u)\n", len, packetbuf_datalen(), packetbuf_totlen());
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return radio->send(packetbuf_hdrptr(), packetbuf_totlen());
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} else {
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PRINTF("6MAC-UT: too large header: %u\n", len);
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static void
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input_packet(const struct radio_driver *d)
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{
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if(receiver_callback) {
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receiver_callback(&sicslowmac_driver);
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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read_packet(void)
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{
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frame802154_t frame;
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int len;
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packetbuf_clear();
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len = radio->read(packetbuf_dataptr(), PACKETBUF_SIZE);
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if(len > 0) {
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packetbuf_set_datalen(len);
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if(frame802154_parse(packetbuf_dataptr(), len, &frame) &&
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packetbuf_hdrreduce(len - frame.payload_len)) {
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if(frame.fcf.dest_addr_mode) {
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if(frame.dest_pid != mac_src_pan_id &&
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frame.dest_pid != FRAME802154_BROADCASTPANDID) {
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/* Not broadcast or for our PAN */
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PRINTF("6MAC: for another pan %u\n", frame.dest_pid);
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return 0;
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}
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if(!is_broadcast_addr(frame.fcf.dest_addr_mode, frame.dest_addr.u8)) {
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packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &frame.dest_addr);
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}
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}
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &frame.src_addr);
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PRINTF("6MAC-IN: %2X", frame.fcf.frame_type);
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PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
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PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
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PRINTF("%u\n", packetbuf_datalen());
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return packetbuf_datalen();
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} else {
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PRINTF("6MAC: failed to parse hdr\n");
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}
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static void
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set_receive_function(void (* recv)(const struct mac_driver *))
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{
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receiver_callback = recv;
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}
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/*---------------------------------------------------------------------------*/
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static int
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on(void)
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{
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return radio->on();
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}
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/*---------------------------------------------------------------------------*/
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static int
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off(int keep_radio_on)
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{
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if(keep_radio_on) {
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return radio->on();
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} else {
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return radio->off();
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}
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}
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/*---------------------------------------------------------------------------*/
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const struct mac_driver sicslowmac_driver = {
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"sicslowmac",
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sicslowmac_init,
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send_packet,
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read_packet,
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set_receive_function,
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on,
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off,
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};
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/*---------------------------------------------------------------------------*/
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const struct mac_driver *
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sicslowmac_init(const struct radio_driver *d)
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{
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mac_dsn = random_rand() % 256;
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radio = d;
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radio->set_receive_function(input_packet);
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radio->on();
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return &sicslowmac_driver;
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}
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/*---------------------------------------------------------------------------*/
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