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/*
* Copyright (C) 2016 Freie Universitรคt Berlin
*
* 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.
*/
/**
* @{
*
* @file
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include <assert.h>
#include <errno.h>
#include <string.h>
#include "net/ieee802154.h"
const uint8_t ieee802154_addr_bcast[IEEE802154_ADDR_BCAST_LEN] = IEEE802154_ADDR_BCAST;
size_t ieee802154_set_frame_hdr(uint8_t *buf, const uint8_t *src, size_t src_len,
const uint8_t *dst, size_t dst_len,
le_uint16_t src_pan, le_uint16_t dst_pan,
uint8_t flags, uint8_t seq)
{
int pos = 3; /* 0-1: FCS, 2: seq */
uint8_t type = (flags & IEEE802154_FCF_TYPE_MASK);
buf[0] = flags;
buf[1] = IEEE802154_FCF_VERS_V1;
if (((src_len != 0) && (src == NULL)) ||
((dst_len != 0) && (dst == NULL))) {
return 0;
}
/* Frame type is not beacon or ACK, but both address modes are zero */
if ((type != IEEE802154_FCF_TYPE_BEACON) && (type != IEEE802154_FCF_TYPE_ACK) &&
(src_len == 0) && (dst_len == 0)) {
return 0;
}
/* set sequence number */
buf[2] = seq;
if (dst_len != 0) {
buf[pos++] = dst_pan.u8[0];
buf[pos++] = dst_pan.u8[1];
}
/* fill in destination address */
switch (dst_len) {
case 0:
buf[1] |= IEEE802154_FCF_DST_ADDR_VOID;
break;
case 2:
if (memcmp(dst, ieee802154_addr_bcast,
sizeof(ieee802154_addr_bcast)) == 0) {
/* do not request ACKs for broadcast address */
buf[0] &= ~IEEE802154_FCF_ACK_REQ;
}
buf[1] |= IEEE802154_FCF_DST_ADDR_SHORT;
buf[pos++] = dst[1];
buf[pos++] = dst[0];
break;
case 8:
buf[1] |= IEEE802154_FCF_DST_ADDR_LONG;
for (int i = 7; i >= 0; i--) {
buf[pos++] = dst[i];
}
break;
default:
return 0;
}
/* fill in source PAN ID (if applicable) */
if (src_len != 0) {
if ((dst_len != 0) && (src_pan.u16 == dst_pan.u16)) {
buf[0] |= IEEE802154_FCF_PAN_COMP;
}
else {
/* (little endian) */
buf[pos++] = src_pan.u8[0];
buf[pos++] = src_pan.u8[1];
}
}
/* fill in source address */
switch (src_len) {
case 0:
buf[1] |= IEEE802154_FCF_SRC_ADDR_VOID;
break;
case 2:
buf[1] |= IEEE802154_FCF_SRC_ADDR_SHORT;
buf[pos++] = src[1];
buf[pos++] = src[0];
break;
case 8:
buf[1] |= IEEE802154_FCF_SRC_ADDR_LONG;
for (int i = 7; i >= 0; i--) {
buf[pos++] = src[i];
}
break;
default:
return 0;
}
/* return actual header length */
return pos;
}
size_t ieee802154_get_frame_hdr_len(const uint8_t *mhr)
{
/* TODO: include security header implications */
uint8_t tmp;
size_t len = 3; /* 2 byte FCF, 1 byte sequence number */
/* figure out address sizes */
tmp = (mhr[1] & IEEE802154_FCF_DST_ADDR_MASK);
if (tmp == IEEE802154_FCF_DST_ADDR_SHORT) {
len += 4; /* 2 byte dst PAN + 2 byte dst short address */
}
else if (tmp == IEEE802154_FCF_DST_ADDR_LONG) {
len += 10; /* 2 byte dst PAN + 2 byte dst long address */
}
else if (tmp != IEEE802154_FCF_DST_ADDR_VOID) {
return 0;
}
else if (mhr[0] & IEEE802154_FCF_PAN_COMP) {
/* PAN compression, but no destination address => illegal state */
return 0;
}
tmp = (mhr[1] & IEEE802154_FCF_SRC_ADDR_MASK);
if (tmp == IEEE802154_FCF_SRC_ADDR_VOID) {
return len;
}
else {
if (!(mhr[0] & IEEE802154_FCF_PAN_COMP)) {
len += 2;
}
if (tmp == IEEE802154_FCF_SRC_ADDR_SHORT) {
return len + 2;
}
else if (tmp == IEEE802154_FCF_SRC_ADDR_LONG) {
return len + 8;
}
}
return 0;
}
int ieee802154_get_src(const uint8_t *mhr, uint8_t *src, le_uint16_t *src_pan)
{
int offset = 3; /* FCF: 0-1, Seq: 2 */
uint8_t tmp;
assert((src != NULL) && (src_pan != NULL));
tmp = mhr[1] & IEEE802154_FCF_DST_ADDR_MASK;
if (tmp == IEEE802154_FCF_DST_ADDR_SHORT) {
if (mhr[0] & IEEE802154_FCF_PAN_COMP) {
src_pan->u8[0] = mhr[offset];
src_pan->u8[1] = mhr[offset + 1];
}
offset += 4;
}
else if (tmp == IEEE802154_FCF_DST_ADDR_LONG) {
if (mhr[0] & IEEE802154_FCF_PAN_COMP) {
src_pan->u8[0] = mhr[offset];
src_pan->u8[1] = mhr[offset + 1];
}
offset += 10;
}
else if (tmp != IEEE802154_FCF_DST_ADDR_VOID) {
return -EINVAL;
}
else if (mhr[0] & IEEE802154_FCF_PAN_COMP) {
/* PAN compression, but no destination address => illegal state */
return -EINVAL;
}
tmp = mhr[1] & IEEE802154_FCF_SRC_ADDR_MASK;
if (tmp != IEEE802154_FCF_SRC_ADDR_VOID) {
if (!(mhr[0] & IEEE802154_FCF_PAN_COMP)) {
src_pan->u8[0] = mhr[offset++];
src_pan->u8[1] = mhr[offset++];
}
}
if (tmp == IEEE802154_FCF_SRC_ADDR_SHORT) {
/* read src PAN and address in little endian */
src[1] = mhr[offset++];
src[0] = mhr[offset++];
return 2;
}
else if (tmp == IEEE802154_FCF_SRC_ADDR_LONG) {
/* read src PAN and address in little endian */
for (int i = 7; i >= 0; i--) {
src[i] = mhr[offset++];
}
return 8;
}
else if (tmp != IEEE802154_FCF_SRC_ADDR_VOID) {
return -EINVAL;
}
return 0;
}
int ieee802154_get_dst(const uint8_t *mhr, uint8_t *dst, le_uint16_t *dst_pan)
{
int offset = 3; /* FCF: 0-1, Seq: 2 */
uint8_t tmp;
assert((dst != NULL) && (dst_pan != NULL));
tmp = mhr[1] & IEEE802154_FCF_DST_ADDR_MASK;
if (tmp == IEEE802154_FCF_DST_ADDR_SHORT) {
/* read dst PAN and address in little endian */
dst_pan->u8[0] = mhr[offset++];
dst_pan->u8[1] = mhr[offset++];
dst[1] = mhr[offset++];
dst[0] = mhr[offset++];
return 2;
}
else if (tmp == IEEE802154_FCF_DST_ADDR_LONG) {
dst_pan->u8[0] = mhr[offset++];
dst_pan->u8[1] = mhr[offset++];
for (int i = 7; i >= 0; i--) {
dst[i] = mhr[offset++];
}
return 8;
}
else if (tmp != IEEE802154_FCF_DST_ADDR_VOID) {
return -EINVAL;
}
else if (mhr[0] & IEEE802154_FCF_PAN_COMP) {
/* PAN compression, but no destination address => illegal state */
return -EINVAL;
}
return 0;
}
/** @} */
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