280 lines
9.8 KiB
C
280 lines
9.8 KiB
C
/*
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* Copyright (c) 2009, 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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*/
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/**
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* \file
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* MAC framer for IEEE 802.15.4
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* \author
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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 "net/mac/framer-802154.h"
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#include "net/mac/frame802154.h"
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#include "net/llsec/llsec802154.h"
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#include "net/packetbuf.h"
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#include "lib/random.h"
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#include <string.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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static uint8_t initialized = 0;
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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 const 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 const uint16_t mac_src_pan_id = IEEE802154_PANID;
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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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create_frame(int type, int do_create)
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{
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frame802154_t params;
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int hdr_len;
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/* init to zeros */
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memset(¶ms, 0, sizeof(params));
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if(!initialized) {
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initialized = 1;
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mac_dsn = random_rand() & 0xff;
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}
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/* Build the FCF. */
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params.fcf.frame_type = packetbuf_attr(PACKETBUF_ATTR_FRAME_TYPE);
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params.fcf.frame_pending = packetbuf_attr(PACKETBUF_ATTR_PENDING);
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if(packetbuf_holds_broadcast()) {
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params.fcf.ack_required = 0;
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} else {
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params.fcf.ack_required = packetbuf_attr(PACKETBUF_ATTR_MAC_ACK);
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}
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params.fcf.panid_compression = 0;
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/* Insert IEEE 802.15.4 (2006) version bits. */
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params.fcf.frame_version = FRAME802154_IEEE802154_2006;
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#if LLSEC802154_SECURITY_LEVEL
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if(packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL)) {
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params.fcf.security_enabled = 1;
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}
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/* Setting security-related attributes */
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params.aux_hdr.security_control.security_level = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
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params.aux_hdr.frame_counter.u16[0] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1);
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params.aux_hdr.frame_counter.u16[1] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3);
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#if LLSEC802154_USES_EXPLICIT_KEYS
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params.aux_hdr.security_control.key_id_mode = packetbuf_attr(PACKETBUF_ATTR_KEY_ID_MODE);
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params.aux_hdr.key_index = packetbuf_attr(PACKETBUF_ATTR_KEY_INDEX);
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params.aux_hdr.key_source.u16[0] = packetbuf_attr(PACKETBUF_ATTR_KEY_SOURCE_BYTES_0_1);
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#endif /* LLSEC802154_USES_EXPLICIT_KEYS */
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#endif /* LLSEC802154_SECURITY_LEVEL */
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/* Increment and set the data sequence number. */
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if(!do_create) {
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/* Only length calculation - no sequence number is needed and
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should not be consumed. */
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} else if(packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO)) {
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params.seq = packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO);
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} else {
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/* Ensure that the sequence number 0 is not used as it would bypass the above check. */
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if(mac_dsn == 0) {
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mac_dsn++;
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}
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params.seq = mac_dsn++;
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packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, params.seq);
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}
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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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if(LINKADDR_SIZE == 2) {
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/* Use short address mode if linkaddr size is short. */
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params.fcf.src_addr_mode = FRAME802154_SHORTADDRMODE;
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} else {
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params.fcf.src_addr_mode = FRAME802154_LONGADDRMODE;
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}
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params.dest_pid = mac_dst_pan_id;
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if(packetbuf_holds_broadcast()) {
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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[0] = 0xFF;
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params.dest_addr[1] = 0xFF;
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} else {
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linkaddr_copy((linkaddr_t *)¶ms.dest_addr,
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packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
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/* Use short address mode if linkaddr size is small */
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if(LINKADDR_SIZE == 2) {
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params.fcf.dest_addr_mode = FRAME802154_SHORTADDRMODE;
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} else {
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params.fcf.dest_addr_mode = FRAME802154_LONGADDRMODE;
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}
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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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linkaddr_copy((linkaddr_t *)¶ms.src_addr, &linkaddr_node_addr);
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params.payload = packetbuf_dataptr();
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params.payload_len = packetbuf_datalen();
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hdr_len = frame802154_hdrlen(¶ms);
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if(!do_create) {
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/* Only calculate header length */
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return hdr_len;
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} else if(packetbuf_hdralloc(hdr_len)) {
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frame802154_create(¶ms, packetbuf_hdrptr());
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PRINTF("15.4-OUT: %2X", params.fcf.frame_type);
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PRINTADDR(params.dest_addr);
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PRINTF("%d %u (%u)\n", hdr_len, packetbuf_datalen(), packetbuf_totlen());
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return hdr_len;
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} else {
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PRINTF("15.4-OUT: too large header: %u\n", hdr_len);
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return FRAMER_FAILED;
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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hdr_length(void)
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{
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return create_frame(FRAME802154_DATAFRAME, 0);
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}
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/*---------------------------------------------------------------------------*/
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static int
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create(void)
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{
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return create_frame(FRAME802154_DATAFRAME, 1);
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}
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/*---------------------------------------------------------------------------*/
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static int
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parse(void)
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{
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frame802154_t frame;
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int hdr_len;
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hdr_len = frame802154_parse(packetbuf_dataptr(), packetbuf_datalen(), &frame);
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if(hdr_len && packetbuf_hdrreduce(hdr_len)) {
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packetbuf_set_attr(PACKETBUF_ATTR_FRAME_TYPE, frame.fcf.frame_type);
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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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/* Packet to another PAN */
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PRINTF("15.4: for another pan %u\n", frame.dest_pid);
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return FRAMER_FAILED;
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}
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if(!is_broadcast_addr(frame.fcf.dest_addr_mode, frame.dest_addr)) {
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packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, (linkaddr_t *)&frame.dest_addr);
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}
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}
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, (linkaddr_t *)&frame.src_addr);
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packetbuf_set_attr(PACKETBUF_ATTR_PENDING, frame.fcf.frame_pending);
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packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, frame.seq);
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#if NETSTACK_CONF_WITH_RIME
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packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, frame.seq);
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#endif
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#if LLSEC802154_SECURITY_LEVEL
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if(frame.fcf.security_enabled) {
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packetbuf_set_attr(PACKETBUF_ATTR_SECURITY_LEVEL, frame.aux_hdr.security_control.security_level);
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packetbuf_set_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1, frame.aux_hdr.frame_counter.u16[0]);
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packetbuf_set_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3, frame.aux_hdr.frame_counter.u16[1]);
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#if LLSEC802154_USES_EXPLICIT_KEYS
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packetbuf_set_attr(PACKETBUF_ATTR_KEY_ID_MODE, frame.aux_hdr.security_control.key_id_mode);
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packetbuf_set_attr(PACKETBUF_ATTR_KEY_INDEX, frame.aux_hdr.key_index);
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packetbuf_set_attr(PACKETBUF_ATTR_KEY_SOURCE_BYTES_0_1, frame.aux_hdr.key_source.u16[0]);
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#endif /* LLSEC802154_USES_EXPLICIT_KEYS */
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}
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#endif /* LLSEC802154_SECURITY_LEVEL */
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PRINTF("15.4-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("%d %u (%u)\n", hdr_len, packetbuf_datalen(), packetbuf_totlen());
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return hdr_len;
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}
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return FRAMER_FAILED;
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}
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/*---------------------------------------------------------------------------*/
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const struct framer framer_802154 = {
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hdr_length,
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create,
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framer_canonical_create_and_secure,
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parse
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};
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/*---------------------------------------------------------------------------*/
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