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Fix ieee802154_frame module

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This commit is contained in:
Martin Lenders 2014-02-13 07:59:02 +01:00
parent bc4befb4e9
commit 90e946eb49
2 changed files with 126 additions and 59 deletions
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40
sys/net/include/ieee802154_frame.h
View File

@ -26,23 +26,44 @@
#include <stdint.h>
/* maximum 802.15.4 header length */
#define IEEE_802154_MAX_HDR_LEN 23
#define IEEE_802154_MAX_HDR_LEN (23)
/* ...and FCS*/
#define IEEE_802154_FCS_LEN 2
#define IEEE_802154_FCS_LEN (2)
#define IEEE_802154_BEACON_FRAME 0
#define IEEE_802154_DATA_FRAME 1
#define IEEE_802154_ACK_FRAME 2
#define IEEE_802154_MAC_CMD_FRAME 3
#define IEEE_802154_BEACON_FRAME (0)
#define IEEE_802154_DATA_FRAME (1)
#define IEEE_802154_ACK_FRAME (2)
#define IEEE_802154_MAC_CMD_FRAME (3)
#define IEEE_802154_SHORT_ADDR_M 2
#define IEEE_802154_LONG_ADDR_M 3
#define IEEE_802154_SHORT_ADDR_M (2)
#define IEEE_802154_LONG_ADDR_M (3)
#define IEEE_802154_SHORT_MCAST_ADDR (0xffff)
#define IEEE_802154_LONG_MCAST_ADDR {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, \
0xff, 0xff}}
/**
* @brief Transform 16-bit number from network order (big-endian) to
* little-endian byte order (as used by IEEE 802.15.4).
*/
#define NTOLES(a) (((a) >> 8) | (((a) & 0x00ff) << 8))
#define IEEE_802154_PAN_ID 0x1234
/**
* @brief Transform 16-bit number from little-endian byte order to network
* order (big-endian).
*/
#define LETONS(a) NTOLES(a)
/**
* @brief Transform 16-bit number from host byte order to little-endian byte
* order (as used by IEEE 802.15.4).
*/
#define HTOLES(a) a
/**
* @brief Transform 16-bit number from little-endian byte order to host byte
* order.
*/
#define LETOHS(a) HTOLES(a)
typedef struct __attribute__((packed)) {
uint8_t frame_type;
@ -84,6 +105,7 @@ uint8_t ieee802154_frame_init(ieee802154_frame_t *frame, uint8_t *buf);
uint8_t ieee802154_frame_get_hdr_len(ieee802154_frame_t *frame);
uint8_t ieee802154_frame_read(uint8_t *buf, ieee802154_frame_t *frame, uint8_t len);
void ieee802154_frame_print_fcf_frame(ieee802154_frame_t *frame);
uint16_t ieee802154_frame_get_fcs(const uint8_t *frame, uint8_t frame_len);
/** @} */
#endif /* IEEE802154_IEEE802154_FRAME */

145
sys/net/link_layer/ieee802154/ieee802154_frame.c
View File

@ -18,6 +18,13 @@
#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;
@ -28,16 +35,16 @@ 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) |
(frame->fcf.sec_enb << 3) |
(frame->fcf.frame_pend << 4) |
(frame->fcf.ack_req << 5) |
(frame->fcf.panid_comp << 6));
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) |
(frame->fcf.frame_ver << 4) |
(frame->fcf.src_addr_m << 6));
buf[index] = (((frame->fcf.dest_addr_m << 2) & 0x0c) |
((frame->fcf.frame_ver << 4) & 0x30) |
((frame->fcf.src_addr_m << 6) & 0xc0));
index++;
@ -55,49 +62,62 @@ uint8_t ieee802154_frame_init(ieee802154_frame_t *frame, uint8_t *buf)
/* Destination Address - 802.15.4 - 2006 - 7.2.1.4 */
if (frame->fcf.dest_addr_m == 0x02) {
buf[index] = frame->dest_addr[0];
buf[index + 1] = frame->dest_addr[1];
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[0];
buf[index + 1] = frame->dest_addr[1];
buf[index + 2] = frame->dest_addr[2];
buf[index + 3] = frame->dest_addr[3];
buf[index + 4] = frame->dest_addr[4];
buf[index + 5] = frame->dest_addr[5];
buf[index + 6] = frame->dest_addr[6];
buf[index + 7] = frame->dest_addr[7];
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] = ((frame->src_pan_id >> 8) & 0xff);
buf[index + 1] = (frame->src_pan_id & 0xff);
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[0];
buf[index + 1] = frame->src_addr[1];
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[0];
buf[index + 1] = frame->src_addr[1];
buf[index + 2] = frame->src_addr[2];
buf[index + 3] = frame->src_addr[3];
buf[index + 4] = frame->src_addr[4];
buf[index + 5] = frame->src_addr[5];
buf[index + 6] = frame->src_addr[6];
buf[index + 7] = frame->src_addr[7];
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;
}
@ -170,13 +190,14 @@ uint8_t ieee802154_frame_read(uint8_t *buf, ieee802154_frame_t *frame,
index += 2;
switch(frame->fcf.dest_addr_m) {
switch (frame->fcf.dest_addr_m) {
case (0): {
printf("fcf.dest_addr_m: pan identifier/address fields empty\n");
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;
@ -184,14 +205,15 @@ uint8_t ieee802154_frame_read(uint8_t *buf, ieee802154_frame_t *frame,
}
case (3): {
frame->dest_addr[0] = buf[index];
frame->dest_addr[1] = buf[index + 1];
frame->dest_addr[2] = buf[index + 2];
frame->dest_addr[3] = buf[index + 3];
frame->dest_addr[4] = buf[index + 4];
frame->dest_addr[5] = buf[index + 5];
frame->dest_addr[6] = buf[index + 6];
frame->dest_addr[7] = buf[index + 7];
/* 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;
}
@ -202,13 +224,14 @@ uint8_t ieee802154_frame_read(uint8_t *buf, ieee802154_frame_t *frame,
index += 2;
}
switch(frame->fcf.src_addr_m) {
switch (frame->fcf.src_addr_m) {
case (0): {
printf("fcf.src_addr_m: pan identifier/address fields empty\n");
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;
@ -216,14 +239,15 @@ uint8_t ieee802154_frame_read(uint8_t *buf, ieee802154_frame_t *frame,
}
case (3): {
frame->src_addr[0] = buf[index];
frame->src_addr[1] = buf[index + 1];
frame->src_addr[2] = buf[index + 2];
frame->src_addr[3] = buf[index + 3];
frame->src_addr[4] = buf[index + 4];
frame->src_addr[5] = buf[index + 5];
frame->src_addr[6] = buf[index + 6];
frame->src_addr[7] = buf[index + 7];
/* 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;
}
@ -236,6 +260,27 @@ uint8_t ieee802154_frame_read(uint8_t *buf, ieee802154_frame_t *frame,
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"