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ieee802154: provide general header build and read functions

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This commit is contained in:
Martine Lenders 2016-01-14 09:19:56 +01:00
parent 3e25e5df86
commit 399b8026d3
5 changed files with 391 additions and 15 deletions
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1
Makefile.pseudomodules
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@ -14,7 +14,6 @@ PSEUDOMODULES += gnrc_sixlowpan_router
PSEUDOMODULES += gnrc_sixlowpan_router_default
PSEUDOMODULES += gnrc_sixlowpan_iphc_nhc
PSEUDOMODULES += gnrc_pktbuf
PSEUDOMODULES += ieee802154
PSEUDOMODULES += log
PSEUDOMODULES += log_printfnoformat
PSEUDOMODULES += newlib

3
sys/Makefile
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@ -19,6 +19,9 @@ endif
ifneq (,$(filter oneway_malloc,$(USEMODULE)))
DIRS += oneway-malloc
endif
ifneq (,$(filter ieee802154,$(USEMODULE)))
DIRS += net/link_layer/ieee802154
endif
ifneq (,$(filter ipv4_addr,$(USEMODULE)))
DIRS += net/network_layer/ipv4/addr
endif

157
sys/include/net/ieee802154.h
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@ -1,5 +1,5 @@
/*
* Copyright (C) 2015 Freie Universität Berlin
* Copyright (C) 2015-16 Freie Universität 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
@ -21,14 +21,26 @@
#ifndef IEEE802154_H_
#define IEEE802154_H_
#include <stdint.h>
#include <stdlib.h>
#include "byteorder.h"
#include "net/eui64.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief IEEE 802.15.4 address lengths
* @{
*/
#define IEEE802154_SHORT_ADDRESS_LEN (2U) /**< short (16-bit) address */
#define IEEE802154_LONG_ADDRESS_LEN (8U) /**< long address (EUI-64) */
/**
* @}
*/
/**
* @brief IEEE802.15.4 FCF field definitions
* @{
@ -43,28 +55,146 @@ extern "C" {
#define IEEE802154_FCF_TYPE_ACK (0x02)
#define IEEE802154_FCF_TYPE_MACCMD (0x03)
#define IEEE802154_FCF_SECURITY_EN (0x08)
#define IEEE802154_FCF_FRAME_PEND (0x10)
#define IEEE802154_FCF_ACK_REQ (0x20)
#define IEEE802154_FCF_PAN_COMP (0x40)
#define IEEE802154_FCF_SECURITY_EN (0x08) /**< enable security */
#define IEEE802154_FCF_FRAME_PEND (0x10) /**< follow-up frame is pending */
#define IEEE802154_FCF_ACK_REQ (0x20) /**< acknowledgement requested from receiver */
#define IEEE802154_FCF_PAN_COMP (0x40) /**< compress source PAN ID */
#define IEEE802154_FCF_DST_ADDR_MASK (0x0c)
#define IEEE802154_FCF_DST_ADDR_VOID (0x00)
#define IEEE802154_FCF_DST_ADDR_SHORT (0x08)
#define IEEE802154_FCF_DST_ADDR_LONG (0x0c)
#define IEEE802154_FCF_DST_ADDR_VOID (0x00) /**< no destination address */
#define IEEE802154_FCF_DST_ADDR_RESV (0x04) /**< reserved address mode */
#define IEEE802154_FCF_DST_ADDR_SHORT (0x08) /**< destination address length is 2 */
#define IEEE802154_FCF_DST_ADDR_LONG (0x0c) /**< destination address length is 8 */
#define IEEE802154_FCF_VERS_MASK (0x30)
#define IEEE802154_FCF_VERS_V0 (0x00)
#define IEEE802154_FCF_VERS_V1 (0x10)
#define IEEE802154_FCF_SRC_ADDR_MASK (0xc0)
#define IEEE802154_FCF_SRC_ADDR_VOID (0x00)
#define IEEE802154_FCF_SRC_ADDR_SHORT (0x80)
#define IEEE802154_FCF_SRC_ADDR_LONG (0xc0)
#define IEEE802154_FCF_SRC_ADDR_VOID (0x00) /**< no source address */
#define IEEE802154_FCF_SRC_ADDR_RESV (0x40) /**< reserved address mode */
#define IEEE802154_FCF_SRC_ADDR_SHORT (0x80) /**< source address length is 2 */
#define IEEE802154_FCF_SRC_ADDR_LONG (0xc0) /**< source address length is 8 */
/** @} */
/**
* @brief Flag for @ref ieee802154_set_frame_hdr to indicate to ignore @p dst
* and @p dst_len and send broadcast.
* @note This flag is RIOT internal and shall not be used in the FCF of
* packets send over the air
*/
#define IEEE802154_BCAST (0x80)
/**
* @brief Initializes an IEEE 802.15.4 MAC frame header in @p buf.
*
* @pre Resulting header must fit in memory allocated at @p buf.
*
* @see IEEE Std 802.15.4-2011, 5.2.1 General MAC frame format.
*
* If @p dst is NULL the IEEE802154_FCF_ACK_REQ will be unset to prevent
* flooding the network.
*
* @param[out] buf Target memory for frame header.
* @param[in] src Source address for frame in network byteorder.
* May be NULL if @ref IEEE802154_FCF_SRC_ADDR_VOID is set
* in @p flags.
* @param[in] src_len Length of @p src. Legal values are:
* * 0 (will set @ref IEEE802154_FCF_SRC_ADDR_VOID in MHR)
* * 2 (will set @ref IEEE802154_FCF_SRC_ADDR_SHORT in MHR)
* * 8 (will set @ref IEEE802154_FCF_SRC_ADDR_LONG in MHR)
* @param[in] dst Destination address for frame in network byteorder.
* May be NULL if @ref IEEE802154_FCF_SRC_ADDR_VOID is set
* in @p flags.
* @param[in] dst_len Length of @p dst. Legal values are:
* * 0 (will set @ref IEEE802154_FCF_DST_ADDR_VOID in MHR)
* * 2 (will set @ref IEEE802154_FCF_DST_ADDR_SHORT in MHR)
* * 8 (will set @ref IEEE802154_FCF_DST_ADDR_LONG in MHR)
* @param[in] src_pan Source PAN ID in little-endian. May be 0 if
* @ref IEEE802154_FCF_PAN_COMP is set in @p flags.
* Otherwise, it will be ignored, when
* @ref IEEE802154_FCF_PAN_COMP is set.
* @param[in] dst_pan Destination PAN ID in little-endian.
* @param[in] flags Flags for the frame. These are interchangable with the
* first byte of the IEEE 802.15.4 FCF. This means that
* it encompasses the type values,
* @ref IEEE802154_FCF_SECURITY_EN,
* @ref IEEE802154_FCF_FRAME_PEND,
* @ref IEEE802154_FCF_ACK_REQ, and
* @ref IEEE802154_FCF_PAN_COMP.
* Additionally the @ref IEEE802154_BCAST flag can be set
* do ignore @p dst and @p dst_len and just set `ff:ff`
* (broadcast) as destination address
* @param[in] seq Sequence number for frame.
*
* The version field in the FCF will be set implicitly to version 1.
*
* @return Size of frame header on success.
* @return 0, on error (flags set to unexpected state).
*/
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);
/**
* @brief Get length of MAC header.
*
* @todo include security header implications
*
* @param[in] mhr MAC header.
*
* @return Length of MAC header on success.
* @return 0, on error (source mode or destination mode set to reserved).
*/
size_t ieee802154_get_frame_hdr_len(const uint8_t *mhr);
/**
* @brief Gets source address from MAC header.
*
* @pre (@p src != NULL) && (@p src_pan != NULL)
*
* @param[in] mhr MAC header.
* @param[out] src Source address in network byte order in MAC header.
* @param[out] src_pan Source PAN little-endian byte order in MAC header.
*
* @return Length of source address.
* @return -EINVAL, if @p mhr contains unexpected flags.
*/
int ieee802154_get_src(const uint8_t *mhr, uint8_t *src, le_uint16_t *src_pan);
/**
* @brief Gets destination address from MAC header.
*
* @pre (@p dst != NULL) && (@p dst_pan != NULL)
*
* @param[in] mhr MAC header.
* @param[out] dst Destination address in network byte order in MAC header.
* @param[out] dst_pan Destination PAN in little-endian byte order in MAC header.
*
* @return Length of destination address.
* @return -EINVAL, if @p mhr contains unexpected flags.
*/
int ieee802154_get_dst(const uint8_t *mhr, uint8_t *dst, le_uint16_t *dst_pan);
/**
* @brief Gets sequence number from MAC header.
*
* @pre length of allocated space at @p mhr > 3
*
* @param[in] mhr MAC header.
*
* @return The sequence number in @p mhr.
*/
static inline uint8_t ieee802154_get_seq(const uint8_t *mhr)
{
return mhr[2];
}
/**
* @brief Generates an IPv6 interface identifier from an IEEE 802.15.4 address.
*
* @pre (@p eui64 != NULL) && (@p addr != NULL)
* @see <a href="https://tools.ietf.org/html/rfc4944#section-6">
* RFC 4944, section 6
* </a>
@ -80,8 +210,8 @@ extern "C" {
* @return Copy of @p eui64 on success.
* @return NULL, if @p addr_len was of illegal length.
*/
static inline eui64_t *ieee802154_get_iid(eui64_t *eui64, uint8_t *addr,
size_t addr_len)
static inline eui64_t *ieee802154_get_iid(eui64_t *eui64, const uint8_t *addr,
size_t addr_len)
{
int i = 0;
@ -119,7 +249,6 @@ static inline eui64_t *ieee802154_get_iid(eui64_t *eui64, uint8_t *addr,
return eui64;
}
#ifdef __cplusplus
}
#endif

1
sys/net/link_layer/ieee802154/Makefile Normal file
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@ -0,0 +1 @@
include $(RIOTBASE)/Makefile.base

244
sys/net/link_layer/ieee802154/ieee802154.c Normal file
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@ -0,0 +1,244 @@
/*
* Copyright (C) 2016 Freie Universität 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 "net/ieee802154.h"
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);
uint8_t bcast = (flags & IEEE802154_BCAST);
buf[0] = flags & (~IEEE802154_BCAST);
buf[1] = IEEE802154_FCF_VERS_V1;
if (((src_len != 0) && (src == NULL)) ||
((!bcast) && (dst_len != 0) && (dst == NULL)) ||
((flags & IEEE802154_FCF_PAN_COMP) &&
(((!bcast) && (dst_len == 0)) || (src_len == 0)))) {
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 (bcast || (dst_len != 0)) {
buf[pos++] = dst_pan.u8[0];
buf[pos++] = dst_pan.u8[1];
}
/* fill in destination address */
if (bcast) {
/* no AUTOACK for broadcast */
buf[0] &= ~IEEE802154_FCF_ACK_REQ;
buf[1] &= ~IEEE802154_FCF_DST_ADDR_MASK;
buf[1] |= IEEE802154_FCF_DST_ADDR_SHORT;
buf[pos++] = 0xff;
buf[pos++] = 0xff;
}
else {
switch (dst_len) {
case 0:
buf[1] |= IEEE802154_FCF_DST_ADDR_VOID;
break;
case 2:
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 (!(flags & IEEE802154_FCF_PAN_COMP) && (src_len != 0)) {
/* (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;
}
/** @} */