nes-proj/os/net/mac/framer/framer-802154.c
2017-10-11 17:25:07 +02:00

298 lines
10 KiB
C

/*
* 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/framer-802154.h"
#include "net/mac/framer/frame802154.h"
#include "net/mac/llsec802154.h"
#include "net/packetbuf.h"
#include "lib/random.h"
#include <string.h>
#include "sys/log.h"
#define LOG_MODULE "Frame 15.4"
#define LOG_LEVEL LOG_LEVEL_FRAMER
/** \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;
/*---------------------------------------------------------------------------*/
static int
create_frame(int do_create)
{
frame802154_t params;
int hdr_len;
if(frame802154_get_pan_id() == 0xffff) {
return -1;
}
/* init to zeros */
memset(&params, 0, sizeof(params));
if(!initialized) {
initialized = 1;
mac_dsn = random_rand() & 0xff;
}
/*
* Before setting up "params", make sure we won't use 0 as the sequence number
* of a newly created frame.
*
* The case when do_create is 0 is ignored since it's for only length
* calculation. No sequence number is needed and should not be consumed.
*/
if(do_create != 0 && packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO) == 0) {
if(mac_dsn == 0) {
mac_dsn++;
}
packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, mac_dsn);
mac_dsn++;
}
framer_802154_setup_params(packetbuf_attr, packetbuf_holds_broadcast(),
&params);
if(packetbuf_holds_broadcast()) {
params.dest_addr[0] = 0xFF;
params.dest_addr[1] = 0xFF;
} else {
linkaddr_copy((linkaddr_t *)&params.dest_addr,
packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
}
linkaddr_copy((linkaddr_t *)&params.src_addr,
packetbuf_addr(PACKETBUF_ADDR_SENDER));
params.payload = packetbuf_dataptr();
params.payload_len = packetbuf_datalen();
hdr_len = frame802154_hdrlen(&params);
if(!do_create) {
/* Only calculate header length */
return hdr_len;
} else if(packetbuf_hdralloc(hdr_len)) {
frame802154_create(&params, packetbuf_hdrptr());
LOG_INFO("Out: %2X ", params.fcf.frame_type);
LOG_INFO_LLADDR((const linkaddr_t *)params.dest_addr);
LOG_INFO_(" %d %u (%u)\n", hdr_len, packetbuf_datalen(), packetbuf_totlen());
return hdr_len;
} else {
LOG_ERR("Out: too large header: %u\n", hdr_len);
return FRAMER_FAILED;
}
}
/*---------------------------------------------------------------------------*/
void
framer_802154_setup_params(packetbuf_attr_t (*get_attr)(uint8_t type),
uint8_t dest_is_broadcast, frame802154_t *params)
{
if(get_attr == NULL || params == NULL) {
LOG_INFO("framer-802154: cannot setup params because of invalid argument\n");
return;
}
/*
* Don't initialize params with 0 because a caller may have already set
* something to it
*/
/* Build the FCF. */
params->fcf.frame_type = get_attr(PACKETBUF_ATTR_FRAME_TYPE);
params->fcf.frame_pending = 0;
if(dest_is_broadcast) {
params->fcf.ack_required = 0;
/* Suppress seqno on broadcast if supported (frame v2 or more) */
params->fcf.sequence_number_suppression = FRAME802154_VERSION >= FRAME802154_IEEE802154_2015;
} else {
params->fcf.ack_required = get_attr(PACKETBUF_ATTR_MAC_ACK);
params->fcf.sequence_number_suppression = FRAME802154_SUPPR_SEQNO;
}
/* Set IE Present bit */
params->fcf.ie_list_present = get_attr(PACKETBUF_ATTR_MAC_METADATA);
/* Insert IEEE 802.15.4 version bits. */
params->fcf.frame_version = FRAME802154_VERSION;
#if LLSEC802154_USES_AUX_HEADER
if(get_attr(PACKETBUF_ATTR_SECURITY_LEVEL)) {
params->fcf.security_enabled = 1;
}
/* Setting security-related attributes */
params->aux_hdr.security_control.security_level = get_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
#if LLSEC802154_USES_FRAME_COUNTER
params->aux_hdr.frame_counter.u16[0] = get_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1);
params->aux_hdr.frame_counter.u16[1] = get_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3);
#else /* LLSEC802154_USES_FRAME_COUNTER */
params->aux_hdr.security_control.frame_counter_suppression = 1;
params->aux_hdr.security_control.frame_counter_size = 1;
#endif /* LLSEC802154_USES_FRAME_COUNTER */
#if LLSEC802154_USES_EXPLICIT_KEYS
params->aux_hdr.security_control.key_id_mode = get_attr(PACKETBUF_ATTR_KEY_ID_MODE);
params->aux_hdr.key_index = get_attr(PACKETBUF_ATTR_KEY_INDEX);
params->aux_hdr.key_source.u16[0] = get_attr(PACKETBUF_ATTR_KEY_SOURCE_BYTES_0_1);
#endif /* LLSEC802154_USES_EXPLICIT_KEYS */
#else
params->fcf.security_enabled = 0;
#endif /* LLSEC802154_USES_AUX_HEADER */
params->seq = get_attr(PACKETBUF_ATTR_MAC_SEQNO);
/* Set the source PAN ID to the global variable. */
params->src_pid = frame802154_get_pan_id();
/* Source address itself should be set outside this function. */
if(get_attr(PACKETBUF_ATTR_MAC_NO_SRC_ADDR) == 1) {
params->fcf.src_addr_mode = FRAME802154_NOADDR;
} else {
if(LINKADDR_SIZE == 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 = frame802154_get_pan_id();
/* Destination address itself should be set outside this function. */
if(get_attr(PACKETBUF_ATTR_MAC_NO_DEST_ADDR) == 1) {
params->fcf.dest_addr_mode = FRAME802154_NOADDR;
} else if(dest_is_broadcast) {
/* Broadcast requires short address mode. */
params->fcf.dest_addr_mode = FRAME802154_SHORTADDRMODE;
} else {
if(LINKADDR_SIZE == 2) {
params->fcf.dest_addr_mode = FRAME802154_SHORTADDRMODE;
} else {
params->fcf.dest_addr_mode = FRAME802154_LONGADDRMODE;
}
}
/* Suppress Source PAN ID and put Destination PAN ID by default */
if(params->fcf.src_addr_mode == FRAME802154_SHORTADDRMODE ||
params->fcf.dest_addr_mode == FRAME802154_SHORTADDRMODE) {
params->fcf.panid_compression = 1;
} else {
params->fcf.panid_compression = 0;
}
}
/*---------------------------------------------------------------------------*/
static int
hdr_length(void)
{
return create_frame(0);
}
/*---------------------------------------------------------------------------*/
static int
create(void)
{
return create_frame(1);
}
/*---------------------------------------------------------------------------*/
static int
parse(void)
{
frame802154_t frame;
int hdr_len;
hdr_len = frame802154_parse(packetbuf_dataptr(), packetbuf_datalen(), &frame);
if(hdr_len && packetbuf_hdrreduce(hdr_len)) {
packetbuf_set_attr(PACKETBUF_ATTR_FRAME_TYPE, frame.fcf.frame_type);
if(frame.fcf.dest_addr_mode) {
if(frame.dest_pid != frame802154_get_pan_id() &&
frame.dest_pid != FRAME802154_BROADCASTPANDID) {
/* Packet to another PAN */
LOG_WARN("15.4: for another pan %u\n", frame.dest_pid);
return FRAMER_FAILED;
}
if(!frame802154_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);
if(frame.fcf.sequence_number_suppression == 0) {
packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, frame.seq);
} else {
packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, 0xffff);
}
#if NETSTACK_CONF_WITH_RIME
packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, frame.seq);
#endif
#if LLSEC802154_USES_AUX_HEADER
if(frame.fcf.security_enabled) {
packetbuf_set_attr(PACKETBUF_ATTR_SECURITY_LEVEL, frame.aux_hdr.security_control.security_level);
#if LLSEC802154_USES_FRAME_COUNTER
packetbuf_set_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1, frame.aux_hdr.frame_counter.u16[0]);
packetbuf_set_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3, frame.aux_hdr.frame_counter.u16[1]);
#endif /* LLSEC802154_USES_FRAME_COUNTER */
#if LLSEC802154_USES_EXPLICIT_KEYS
packetbuf_set_attr(PACKETBUF_ATTR_KEY_ID_MODE, frame.aux_hdr.security_control.key_id_mode);
packetbuf_set_attr(PACKETBUF_ATTR_KEY_INDEX, frame.aux_hdr.key_index);
packetbuf_set_attr(PACKETBUF_ATTR_KEY_SOURCE_BYTES_0_1, frame.aux_hdr.key_source.u16[0]);
#endif /* LLSEC802154_USES_EXPLICIT_KEYS */
}
#endif /* LLSEC802154_USES_AUX_HEADER */
LOG_INFO("In: %2X ", frame.fcf.frame_type);
LOG_INFO_LLADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
LOG_INFO_(" ");
LOG_INFO_LLADDR(packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
LOG_INFO_(" %d %u (%u)\n", hdr_len, packetbuf_datalen(), packetbuf_totlen());
return hdr_len;
}
return FRAMER_FAILED;
}
/*---------------------------------------------------------------------------*/
const struct framer framer_802154 = {
hdr_length,
create,
parse
};
/*---------------------------------------------------------------------------*/