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RIOT/sys/net/link_layer/ieee802154/ieee802154_frame.c

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/**
* implementation for the IEEE 802.15.4 frame format
*
* Copyright (C) 2013 INRIA.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*
* @ingroup sixlowpan
* @{
* @file ieee802154_frame.c
* @brief IEEE 802.14.4 framing operations
* @author Stephan Zeisberg <zeisberg@mi.fu-berlin.de>
* @author Oliver Hahm <oliver.hahm@inria.fr>
* @}
*/
#include "ieee802154_frame.h"
#define ENABLE_DEBUG (0)
#if ENABLE_DEBUG
#define DEBUG_ENABLED
#endif
#include "debug.h"
#define IEEE_802154_FCS_POLY (0x8408) /* x^16 + x^12 + x^5 + 1 for LSB first */
uint8_t ieee802154_hdr_ptr;
uint8_t ieee802154_payload_ptr;
uint16_t ieee802154_payload_len;
uint8_t ieee802154_frame_init(ieee802154_frame_t *frame, uint8_t *buf)
{
/* Frame Control Field - 802.15.4 - 2006 - 7.2.1.1 */
uint8_t index = 0;
buf[index] = (((frame->fcf.frame_type) & 0x07) |
((frame->fcf.sec_enb << 3) & 0x08) |
((frame->fcf.frame_pend << 4) & 0x10) |
((frame->fcf.ack_req << 5) & 0x20) |
((frame->fcf.panid_comp << 6) & 0x40));
index++;
buf[index] = (((frame->fcf.dest_addr_m << 2) & 0x0c) |
((frame->fcf.frame_ver << 4) & 0x30) |
((frame->fcf.src_addr_m << 6) & 0xc0));
index++;
/* Sequence Number - 802.15.4 - 2006 - 7.2.1.2 */
buf[index] = frame->seq_nr;
index++;
/* Destination PAN Identifier - 802.15.4 - 2006 - 7.2.1.3 */
if (frame->fcf.dest_addr_m == 0x02 || frame->fcf.dest_addr_m == 0x03) {
buf[index + 1] = ((frame->dest_pan_id >> 8) & 0xff);
buf[index] = (frame->dest_pan_id & 0xff);
}
index += 2;
/* Destination Address - 802.15.4 - 2006 - 7.2.1.4 */
if (frame->fcf.dest_addr_m == 0x02) {
buf[index] = frame->dest_addr[1];
buf[index + 1] = frame->dest_addr[0];
index += 2;
}
else if (frame->fcf.dest_addr_m == 0x03) {
buf[index] = frame->dest_addr[7];
buf[index + 1] = frame->dest_addr[6];
buf[index + 2] = frame->dest_addr[5];
buf[index + 3] = frame->dest_addr[4];
buf[index + 4] = frame->dest_addr[3];
buf[index + 5] = frame->dest_addr[2];
buf[index + 6] = frame->dest_addr[1];
buf[index + 7] = frame->dest_addr[0];
index += 8;
}
/* Source PAN Identifier - 802.15.4 - 2006 - 7.2.1.5 */
if (!(frame->fcf.panid_comp & 0x01)) {
if (frame->fcf.src_addr_m == 0x02 || frame->fcf.src_addr_m == 0x03) {
buf[index + 1] = ((frame->src_pan_id >> 8) & 0xff);
buf[index] = (frame->src_pan_id & 0xff);
index += 2;
}
}
/* Source Address field - 802.15.4 - 2006 - 7.2.1.6 */
if (frame->fcf.src_addr_m == 0x02) {
buf[index] = frame->src_addr[1];
buf[index + 1] = frame->src_addr[0];
index += 2;
}
else if (frame->fcf.src_addr_m == 0x03) {
buf[index] = frame->src_addr[7];
buf[index + 1] = frame->src_addr[6];
buf[index + 2] = frame->src_addr[5];
buf[index + 3] = frame->src_addr[4];
buf[index + 4] = frame->src_addr[3];
buf[index + 5] = frame->src_addr[2];
buf[index + 6] = frame->src_addr[1];
buf[index + 7] = frame->src_addr[0];
index += 8;
}
#ifdef DEBUG_ENABLED
DEBUG("INFO: IEEE 802.15.4 header initialized:\n");
for (size_t i = 0; i < index; i++) {
printf("%02x ", buf[i]);
if (!((i + 1) % 16) || i == index - 1) {
printf("\n");
}
}
#endif
return index;
}
/** 2 1 2 VAR 2 VAR
* -------------------------------------------
* | FCF | DSN | DPID | DAD | SPID | SAD |
* -------------------------------------------
*/
uint8_t ieee802154_frame_get_hdr_len(ieee802154_frame_t *frame)
{
uint8_t len = 0;
if (frame->fcf.dest_addr_m == 0x02) {
len += 2;
}
else if (frame->fcf.dest_addr_m == 0x03) {
len += 8;
}
if (frame->fcf.src_addr_m == 0x02) {
len += 2;
}
else if (frame->fcf.src_addr_m == 0x03) {
len += 8;
}
if ((frame->fcf.dest_addr_m == 0x02) || (frame->fcf.dest_addr_m == 0x03)) {
len += 2;
}
if ((frame->fcf.src_addr_m == 0x02) || (frame->fcf.src_addr_m == 0x03)) {
len += 2;
}
/* if src pan id == dest pan id set compression bit */
if (frame->src_pan_id == frame->dest_pan_id) {
frame->fcf.panid_comp = 1;
len -= 2;
}
/* (DPID + DAD + SPID + SAD) + (FCF + DSN) */
return (len + 3);
}
uint8_t ieee802154_frame_read(uint8_t *buf, ieee802154_frame_t *frame,
uint8_t len)
{
uint8_t index = 0;
uint8_t hdrlen;
frame->fcf.frame_type = (buf[index]) & 0x07;
frame->fcf.sec_enb = (buf[index] >> 3) & 0x01;
frame->fcf.frame_pend = (buf[index] >> 4) & 0x01;
frame->fcf.ack_req = (buf[index] >> 5) & 0x01;
frame->fcf.panid_comp = (buf[index] >> 6) & 0x01;
index++;
frame->fcf.dest_addr_m = (buf[index] >> 2) & 0x03;
frame->fcf.frame_ver = (buf[index] >> 4) & 0x03;
frame->fcf.src_addr_m = (buf[index] >> 6) & 0x03;
index++;
frame->seq_nr = buf[index];
index++;
frame->dest_pan_id = (((uint16_t)buf[index]) << 8) | buf[index + 1];
index += 2;
switch (frame->fcf.dest_addr_m) {
case (0): {
DEBUG("fcf.dest_addr_m: pan identifier/address fields empty\n");
break;
}
case (2): {
/* read address in little-endian order */
frame->dest_addr[0] = buf[index];
frame->dest_addr[1] = buf[index + 1];
index += 2;
break;
}
case (3): {
/* read address in network order */
frame->dest_addr[7] = buf[index];
frame->dest_addr[6] = buf[index + 1];
frame->dest_addr[5] = buf[index + 2];
frame->dest_addr[4] = buf[index + 3];
frame->dest_addr[3] = buf[index + 4];
frame->dest_addr[2] = buf[index + 5];
frame->dest_addr[1] = buf[index + 6];
frame->dest_addr[0] = buf[index + 7];
index += 8;
break;
}
}
if (!(frame->fcf.panid_comp == 1)) {
frame->src_pan_id = (((uint16_t)buf[index]) << 8) | buf[index + 1];
index += 2;
}
switch (frame->fcf.src_addr_m) {
case (0): {
DEBUG("fcf.src_addr_m: pan identifier/address fields empty\n");
break;
}
case (2): {
/* read address in little-endian order */
frame->src_addr[0] = buf[index];
frame->src_addr[1] = buf[index + 1];
index += 2;
break;
}
case (3): {
/* read address in network order */
frame->src_addr[7] = buf[index];
frame->src_addr[6] = buf[index + 1];
frame->src_addr[5] = buf[index + 2];
frame->src_addr[4] = buf[index + 3];
frame->src_addr[3] = buf[index + 4];
frame->src_addr[2] = buf[index + 5];
frame->src_addr[1] = buf[index + 6];
frame->src_addr[0] = buf[index + 7];
index += 8;
break;
}
}
frame->payload = (buf + index);
hdrlen = index;
frame->payload_len = (len - hdrlen - IEEE_802154_FCS_LEN);
return hdrlen;
}
/* crc with lsb first */
uint16_t ieee802154_frame_get_fcs(const uint8_t *frame, uint8_t frame_len)
{
uint16_t r = 0;
for (uint8_t byte = 0; byte < frame_len; ++byte) {
r ^= frame[byte];
for (uint8_t bit = 8; bit > 0; --bit) {
if (r & 0x0001) {
r = (r >> 1) ^ IEEE_802154_FCS_POLY;
}
else {
r = (r >> 1);
}
}
}
return r;
}
void ieee802154_frame_print_fcf_frame(ieee802154_frame_t *frame)
{
printf("frame type: %02x\n"
"security enabled: %02x\n"
"frame pending: %02x\n"
"ack requested: %02x\n"
"pan id compression: %02x\n"
"destination address mode: %02x\n"
"frame version: %02x\n"
"source address mode: %02x\n",
frame->fcf.frame_type,
frame->fcf.sec_enb,
frame->fcf.frame_pend,
frame->fcf.ack_req,
frame->fcf.panid_comp,
frame->fcf.dest_addr_m,
frame->fcf.frame_ver,
frame->fcf.src_addr_m);
}
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