6LoWPAN Neighbor Discovery

Message types and helper functions for Neighbor Discovery Optimization for 6LoWPAN (6LoWPAN-ND) More...

Detailed Description

Message types and helper functions for Neighbor Discovery Optimization for 6LoWPAN (6LoWPAN-ND)

See also

RFC 6775, section 4

Files
file	nd.h
	Message type and helper function definitions for 6LoWPAN-ND.

Data Structures
struct	sixlowpan_nd_da_t
	Duplicate address request and confirmation message format. More...
struct	sixlowpan_nd_opt_ar_t
	Address registration option format. More...
struct	sixlowpan_nd_opt_6ctx_t
	6LoWPAN context option format More...
struct	sixlowpan_nd_opt_abr_t
	Authoritative border router option format. More...

Functions
static bool	sixlowpan_nd_opt_6ctx_is_comp (const sixlowpan_nd_opt_6ctx_t *ctx_opt)
	Checks if a 6LoWPAN context in an 6LoWPAN context option is valid for compression. More...
static uint8_t	sixlowpan_nd_opt_6ctx_get_cid (const sixlowpan_nd_opt_6ctx_t *ctx_opt)
	Gets a CID (context identifier) from a 6LoWPAN context option. More...
static void	sixlowpan_nd_opt_6ctx_set_cid (sixlowpan_nd_opt_6ctx_t *ctx_opt, uint8_t cid)
	Sets a CID (context identifier) for a 6LoWPAN context option. More...
static uint32_t	sixlowpan_nd_opt_abr_get_version (const sixlowpan_nd_opt_abr_t *abr_opt)
	Gets the version in correct order from an Authoritative Border Router option. More...
static void	sixlowpan_nd_opt_abr_set_version (sixlowpan_nd_opt_abr_t *abr_opt, uint32_t version)
	Sets the version of an Authoritative Border Router option. More...
static uint16_t	gnrc_sixlowpan_nd_opt_get_ltime (const sixlowpan_nd_opt_abr_t *abr_opt)
	Get the lifetime of an Authoritative Border Router from an ABR option. More...

Lengths for fixed length options
Note Options don't use bytes as their length unit, but 8 bytes.
#define	SIXLOWPAN_ND_OPT_6CTX_LEN_MIN   (2U)
#define	SIXLOWPAN_ND_OPT_6CTX_LEN_MAX   (3U)
#define	SIXLOWPAN_ND_OPT_AR_LEN   (2U)
#define	SIXLOWPAN_ND_OPT_ABR_LEN   (3U)

Authoritative border router option constants
See also RFC 6775, section 4.3
#define	SIXLOWPAN_ND_OPT_ABR_LTIME_DEFAULT   (10000U)
	Valid lifetime (in minutes) assumed if sixlowpan_nd_opt_abr_t::ltime is 0.

Status values for address registration option and DARs
See also RFC 6775, section 4.1
#define	SIXLOWPAN_ND_STATUS_SUCCESS   (0)
	success
#define	SIXLOWPAN_ND_STATUS_DUP   (1)
	duplicate address
#define	SIXLOWPAN_ND_STATUS_NC_FULL   (2)
	neighbor cache full

Flags for 6LoWPAN context option
#define	SIXLOWPAN_ND_OPT_6CTX_FLAGS_MASK   (0x1f)
#define	SIXLOWPAN_ND_OPT_6CTX_FLAGS_C   (0x10)
	valid for compression
#define	SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK   (0x0f)
	mask for CID

6LoWPAN border router constants
See also RFC 6775, section 9
#define	SIXLOWPAN_ND_MIN_CTX_CHANGE_SEC_DELAY   (300U)
	MIN_CONTEXT_CHANGE_DELAY (in sec)

6LoWPAN router constants
See also RFC 6775, section 9
#define	SIXLOWPAN_ND_MAX_RA_NUMOF   (3U)
	MAX_RTR_ADVERTISEMENTS.
#define	SIXLOWPAN_ND_MIN_MS_DELAY_BETWEEN_RAS   (10000U)
	MIN_DELAY_BETWEEN_RAS (in ms)
#define	SIXLOWPAN_ND_MAX_RA_MS_DELAY   (2000U)
	MAX_RA_DELAY_TIME (in ms)
#define	SIXLOWPAN_ND_TENTATIVE_NCE_SEC_LTIME   (20U)
	TENTATIVE_NCE_LIFETIME (in sec)

Router constants
See also RFC 6775, section 9
#define	SIXLOWPAN_ND_MULTIHOP_HL   (64U)
	MULTIHOP_HOPLIMIT.

Host constants
See also RFC 6775, section 9
#define	SIXLOWPAN_ND_REG_TRANSMIT_NUMOF   (3U)
	Number of address registration retries. More...
#define	SIXLOWPAN_ND_RS_MSEC_INTERVAL   (10000U)
	RTR_SOLICITATION_INTERVAL (in msec)
#define	SIXLOWPAN_ND_MAX_RS_NUMOF   (3U)
	MAX_RTR_SOLICITATIONS.
#define	SIXLOWPAN_ND_MAX_RS_SEC_INTERVAL   (60U)
	MAX_RTR_SOLICITATIONS_INTERVAL (in seconds)

Macro Definition Documentation

SIXLOWPAN_ND_REG_TRANSMIT_NUMOF

#define SIXLOWPAN_ND_REG_TRANSMIT_NUMOF   (3U)

Number of address registration retries.

Note

Must not be greater than 7 for Generic (GNRC) network stack since GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_TENTATIVE restricts it to that number.

Definition at line 123 of file nd.h.

Function Documentation

gnrc_sixlowpan_nd_opt_get_ltime()

static uint16_t gnrc_sixlowpan_nd_opt_get_ltime ( const sixlowpan_nd_opt_abr_t *  abr_opt )

inlinestatic

Get the lifetime of an Authoritative Border Router from an ABR option.

Parameters

[in]

abr_opt

An Authoritative Border Router option (ABRO).

Returns

The lifetime of abr_opt in minutes. If the lifetime is 0, SIXLOWPAN_ND_OPT_ABR_LTIME_DEFAULT is returned.

Definition at line 271 of file nd.h.

sixlowpan_nd_opt_6ctx_get_cid()

static uint8_t sixlowpan_nd_opt_6ctx_get_cid ( const sixlowpan_nd_opt_6ctx_t *  ctx_opt )

inlinestatic

Gets a CID (context identifier) from a 6LoWPAN context option.

Parameters

[in]

ctx_opt

A 6LoWPAN context option.

Returns

The CID in the 6LoWPAN context option ctx_opt.

Definition at line 219 of file nd.h.

sixlowpan_nd_opt_6ctx_is_comp()

static bool sixlowpan_nd_opt_6ctx_is_comp ( const sixlowpan_nd_opt_6ctx_t *  ctx_opt )

inlinestatic

Checks if a 6LoWPAN context in an 6LoWPAN context option is valid for compression.

Parameters

[in]

ctx_opt

A 6LoWPAN context option.

Returns

true, if C bit is set in ctx_opt.

false, if C bit is unset in ctx_opt.

Definition at line 207 of file nd.h.

sixlowpan_nd_opt_6ctx_set_cid()

static void sixlowpan_nd_opt_6ctx_set_cid ( sixlowpan_nd_opt_6ctx_t *  ctx_opt, uint8_t  cid  )

inlinestatic

Sets a CID (context identifier) for a 6LoWPAN context option.

Parameters

[out]	ctx_opt	A 6LoWPAN context option.
[in]	cid	The CID for the 6LoWPAN context option.

Definition at line 230 of file nd.h.

sixlowpan_nd_opt_abr_get_version()

static uint32_t sixlowpan_nd_opt_abr_get_version ( const sixlowpan_nd_opt_abr_t *  abr_opt )

inlinestatic

Gets the version in correct order from an Authoritative Border Router option.

Parameters

[in]

abr_opt

An Authoritative Border Router option (ABRO).

Returns

The version of the ABRO

Definition at line 244 of file nd.h.

sixlowpan_nd_opt_abr_set_version()

static void sixlowpan_nd_opt_abr_set_version ( sixlowpan_nd_opt_abr_t *  abr_opt, uint32_t  version  )

inlinestatic

Sets the version of an Authoritative Border Router option.

Parameters

[in]	abr_opt	An Authoritative Border Router option (ABRO).
[in]	version	Version for the ABRO.

Definition at line 256 of file nd.h.