IPv6 neighbor discovery

Provides IPv6 neighbor discovery message types. More...

Detailed Description

Provides IPv6 neighbor discovery message types.

Files
file	ndp.h
	IPv6 neighbor discovery message type definitions.

Data Structures
struct	ndp_rtr_sol_t
	Router solicitation message format. More...
struct	ndp_rtr_adv_t
	Router advertisement message format. More...
struct	ndp_nbr_sol_t
	Neighbor solicitation message format. More...
struct	ndp_nbr_adv_t
	Neighbor advertisement message format. More...
struct	ndp_redirect_t
	Redirect message format. More...
struct	ndp_opt_t
	General NDP option format. More...
struct	ndp_opt_pi_t
	Prefix information option format. More...
struct	ndp_opt_rh_t
	Redirected header option format. More...
struct	ndp_opt_mtu_t
	MTU option format. More...
struct	ndp_opt_rdnss_t
	Recursive DNS server option format without payload. More...
struct	ndp_opt_rdnss_impl_t
	Recursive DNS server option format with payload. More...

Macros
#define	NDP_OPT_RDNSS_MIN_LEN   (3U)
	Minimum length of a recursive DNS server option (in units of 8 bytes) More...
#define	NDP_HOP_LIMIT   (255U)
	Hop-limit required for most NDP messages to ensure link-local communication. More...

Router advertisement flags
See also RFC 4861, section 4.2
#define	NDP_RTR_ADV_FLAGS_MASK   (0xc0)
#define	NDP_RTR_ADV_FLAGS_M   (0x80)
	managed address configuration
#define	NDP_RTR_ADV_FLAGS_O   (0x40)
	other configuration
#define	NDP_RTR_ADV_CUR_HL_UNSPEC   (0)
	Router advertisement constants. More...
#define	NDP_RTR_ADV_LTIME_SEC_MAX   (9000)
	maximum router lifetime in seconds More...
#define	NDP_NBR_ADV_LTIME_NOT_DR   (0)
	router should not be a default router More...
#define	NDP_NBR_ADV_REACH_TIME   (0)
	reachable time unspecified by advertising router
#define	NDP_NBR_ADV_RETRANS_TIMER   (0)
	retrans. More...

Neighbor advertisement flags
See also RFC 4861, section 4.4
#define	NDP_NBR_ADV_FLAGS_MASK   (0xe0)
#define	NDP_NBR_ADV_FLAGS_R   (0x80)
	router
#define	NDP_NBR_ADV_FLAGS_S   (0x40)
	solicited
#define	NDP_NBR_ADV_FLAGS_O   (0x20)
	override

NDP option types
See also IANA, IPv6 Neighbor Discovery Option Formats
#define	NDP_OPT_SL2A   (1)
	source link-layer address option
#define	NDP_OPT_TL2A   (2)
	target link-layer address option
#define	NDP_OPT_PI   (3)
	prefix information option
#define	NDP_OPT_RH   (4)
	redirected option
#define	NDP_OPT_MTU   (5)
	MTU option.
#define	NDP_OPT_RDNSS   (25)
	recursive DNS server option
#define	NDP_OPT_AR   (33)
	address registration option
#define	NDP_OPT_6CTX   (34)
	6LoWPAN context option
#define	NDP_OPT_ABR   (35)
	authoritative border router option

Flags for prefix information option
#define	NDP_OPT_PI_FLAGS_MASK   (0xc0)
#define	NDP_OPT_PI_FLAGS_L   (0x80)
	on-link
#define	NDP_OPT_PI_FLAGS_A   (0x40)
	autonomous address configuration

Prefix information option constants
See also RFC 4861, section 4.6.2
#define	NDP_OPT_PI_VALID_LTIME_INF   (UINT32_MAX)
	infinite valid lifetime
#define	NDP_OPT_PI_PREF_LTIME_INF   (UINT32_MAX)
	infinite preferred lifetime

Lengths for fixed length options
Note Options don't use bytes as their length unit, but 8 bytes.
#define	NDP_OPT_PI_LEN   (4U)
#define	NDP_OPT_MTU_LEN   (1U)

Router constants
See also RFC 4861, section 6.2.1 RFC 4861, section 10
#define	NDP_MAX_INIT_RA_INTERVAL   (16000U)
	MAX_INITIAL_RTR_ADVERT_INTERVAL (in ms)
#define	NDP_MAX_INIT_RA_NUMOF   (3U)
	MAX_INITIAL_RTR_ADVERTISEMENT.
#define	NDP_MAX_FIN_RA_NUMOF   (3U)
	MAX_FINAL_RTR_ADVERTISEMENT.
#define	NDP_MIN_MS_DELAY_BETWEEN_RAS   (3000U)
	MIN_DELAY_BETWEEN_RAS (in ms)
#define	NDP_MAX_RA_DELAY   (500U)
	MAX_RA_DELAY_TIME (in ms)
#define	NDP_MAX_RA_INTERVAL_MS   (600000U)
	default of MaxRtrAdvInterval (in ms)
#define	NDP_MIN_RA_INTERVAL_MS   (198000U)
	default of MinRtrAdvInterval (in ms)
#define	NDP_RTR_LTIME_SEC   (1800U)
	default of AdvDefaultLifetime (in sec)

Host constants
See also RFC 4861, section 10
#define	NDP_MAX_RS_MS_DELAY   (1000U)
	MAX_RTR_SOLICITATION_DELAY (in ms)
#define	NDP_RS_MS_INTERVAL   (4000U)
	RTR_SOLICITATION_INTERVAL (in ms)
#define	NDP_MAX_RS_NUMOF   (3U)
	MAX_RTR_SOLICITATIONS.

Node constants
See also RFC 4861, section 10
#define	NDP_MAX_MC_SOL_NUMOF   (3U)
	MAX_MULTICAST_SOLICIT.
#define	NDP_MAX_UC_SOL_NUMOF   (3U)
	MAX_UNICAST_SOLICIT.
#define	NDP_DAD_TRANSMIT_NUMOF   (1U)
	Default for DupAddrDetectTransmits. More...
#define	NDP_MAX_ANYCAST_MS_DELAY   (1000U)
	MAX_ANYCAST_DELAY_TIME (in ms)
#define	NDP_MAX_NA_NUMOF   (3U)
	MAX_NEIGHBOR_ADVERTISEMENT.
#define	NDP_REACH_MS   (30000U)
	REACHABLE_TIME (in ms)
#define	NDP_RETRANS_TIMER_MS   (1000U)
	RETRANS_TIMER (in ms)
#define	NDP_MAX_RETRANS_TIMER_MS   (60000U)
	MAX_RETRANS_TIMER (in ms) More...
#define	NDP_MAX_NS_NUMOF   (17U)
	Maximum retransmission of neighbor solicitations when UNREACHABLE. More...
#define	NDP_DELAY_FIRST_PROBE_MS   (5000U)
	DELAY_FIRST_PROBE_TIME (in ms)
#define	NDP_MIN_RANDOM_FACTOR   (500U)
	MIN_RANDOM_FACTOR (x 1000)
#define	NDP_MAX_RANDOM_FACTOR   (1500U)
	MAX_RANDOM_FACTOR (x 1000)

Macro Definition Documentation

NDP_DAD_TRANSMIT_NUMOF

#define NDP_DAD_TRANSMIT_NUMOF   (1U)

Default for DupAddrDetectTransmits.

See also

RFC 4862, section 5.1

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 171 of file ndp.h.

NDP_HOP_LIMIT

#define NDP_HOP_LIMIT   (255U)

Hop-limit required for most NDP messages to ensure link-local communication.

See also

RFC 4861, section 4.1

RFC 4861, section 4.2

RFC 4861, section 4.3

RFC 4861, section 4.4

RFC 4861, section 4.5

Definition at line 206 of file ndp.h.

NDP_MAX_NS_NUMOF

#define NDP_MAX_NS_NUMOF   (17U)

Maximum retransmission of neighbor solicitations when UNREACHABLE.

With more than this number the backoff will always be larger than NDP_MAX_RETRANS_TIMER_MS, even if the random factor is 0.5 and the retransmission time is 1ms.

Definition at line 190 of file ndp.h.

NDP_MAX_RETRANS_TIMER_MS

#define NDP_MAX_RETRANS_TIMER_MS   (60000U)

MAX_RETRANS_TIMER (in ms)

See also

RFC 7048

Definition at line 181 of file ndp.h.

NDP_NBR_ADV_LTIME_NOT_DR

#define NDP_NBR_ADV_LTIME_NOT_DR   (0)

router should not be a default router

See also

RFC 4861, section 6.2.1

Definition at line 61 of file ndp.h.

NDP_NBR_ADV_RETRANS_TIMER

#define NDP_NBR_ADV_RETRANS_TIMER   (0)

retrans.

timer unspecified by advertising router

Definition at line 64 of file ndp.h.

NDP_OPT_RDNSS_MIN_LEN

#define NDP_OPT_RDNSS_MIN_LEN   (3U)

Minimum length of a recursive DNS server option (in units of 8 bytes)

See also

RFC 8106, section 5.1

Definition at line 128 of file ndp.h.

NDP_RTR_ADV_CUR_HL_UNSPEC

#define NDP_RTR_ADV_CUR_HL_UNSPEC   (0)

Router advertisement constants.

See also

RFC 4861, section 4.2 current hop limit unspecified by advertising router

Definition at line 49 of file ndp.h.

NDP_RTR_ADV_LTIME_SEC_MAX

#define NDP_RTR_ADV_LTIME_SEC_MAX   (9000)

maximum router lifetime in seconds

See also

RFC 4861, section 6.2.1

Definition at line 55 of file ndp.h.