_nib-arsm.h

void _snd_ns(const ipv6_addr_t * tgt, gnrc_netif_t * netif, const ipv6_addr_t * src, const ipv6_addr_t * dst)

Sends neighbor solicitation (including ARO if required)

Parameters

tgt:The target address of the neighbor solicitation. Must not be NULL or a multicast address. netif:Interface to send over. Must not be NULL. src:Source address for the neighbor solicitation. Will be chosen from the interface according to dst, if NULL. dst:Destination address for neighbor solicitation. Must not be NULL.

void _snd_uc_ns(_nib_onl_entry_t * nbr, bool reset)

Sends unicast neighbor solicitation and reset corresponding timer event.

Note

Neighbor solicitations are used by the ARSM, but also by other mechanisms (e.g. duplicate address detection 6Lo address resolution). This is why it is defined here, but not exclusively available when ipv6/nib/conf.h::GNRC_IPV6_NIB_CONF_ARSM is set.

Parameters

nbr:Neighbor to send neighbor solicitation to. reset:Reset probe counter.

void _handle_sl2ao(gnrc_netif_t * netif, const ipv6_hdr_t * ipv6, const icmpv6_hdr_t * icmpv6, const ndp_opt_t * sl2ao)

Handles SL2AO.

Note

This is here (but not only available with ipv6/nib/conf.h::GNRC_IPV6_NIB_CONF_ARSM set) since it is closely related to the ARSM, but ARSM isn’t the only mechanism using it (e.g. the 6Lo address registration uses it).

Parameters

netif:Interface the SL2AO was sent over. ipv6:IPv6 header of the message carrying the SL2AO. icmpv6:ICMPv6 header of the message carrying the SL2AO. sl2ao:The SL2AO

void _handle_snd_ns(_nib_onl_entry_t * nbr)

Handler for nib.h::GNRC_IPV6_NIB_SND_UC_NS and nib.h::GNRC_IPV6_NIB_SND_UC_NS event handler.

Parameters

nbr:Neighbor to send the neighbor solicitation to.

void _handle_state_timeout(_nib_onl_entry_t * nbr)

Handler for nib.h::GNRC_IPV6_NIB_DELAY_TIMEOUT and nib.h::GNRC_IPV6_NIB_REACH_TIMEOUT event handler.

Parameters

nbr:Neighbor to handle the state timeout for to.

void _probe_nbr(_nib_onl_entry_t * nbr, bool reset)

Probes neighbor with neighbor solicitations.

Parameters

nbr:Neighbor to probe. reset:Reset probe counter.

void _handle_adv_l2(gnrc_netif_t * netif, _nib_onl_entry_t * nce, const icmpv6_hdr_t * icmpv6, const ndp_opt_t * tl2ao)

Handles advertised link-layer information.

This can either be an TL2AO or for a link-layer without addresses just a neighbor advertisement.

Parameters

netif:Interface the link-layer information was advertised over. nce:Neighbor cache entry that is updated by the advertised link-layer information. icmpv6:The ICMPv6 message (neighbor advertisement or redirect message) that carries the link-layer information. tl2ao:The TL2AO carrying the link-layer information. May be NULL for link-layers without addresses.

void _recalc_reach_time(gnrc_netif_ipv6_t * netif)

Recalculates the (randomized) reachable time of on a network interface.

See also

RFC 4861, section 6.3.4

Parameters

netif:Interface to set reachable time for.

void _set_reachable(gnrc_netif_t * netif, _nib_onl_entry_t * nce)

Sets a neighbor cache entry reachable and starts the required event timers.

Parameters

netif:Interface to the NCE nce:The neighbor cache entry to set reachable

void _init_iface_arsm(gnrc_netif_t * netif)

Initializes interface for address registration state machine.

Parameters

netif:An interface

uint16_t _get_nud_state(_nib_onl_entry_t * nbr)

Gets neighbor unreachability state of a neighbor.

Parameters

nbr:Neighbor cache entry representing the neighbor.

Return values

• Neighbor unreachability state of the nbr.

void _set_nud_state(gnrc_netif_t * netif, _nib_onl_entry_t * nbr, uint16_t state)

Sets neighbor unreachablility state of a neighbor.

Parameters

netif:The network interface (to signal routing protocol using gnrc_netif_t::ipv6::route_info_cb()) nbr:Neighbor cache entry representing the neighbor. state:Neighbor unreachability state for the neighbor.

bool _is_reachable(_nib_onl_entry_t * entry)

Checks if a node is in a reachable state.

A node is reachable if it is not in NUD state UNREACHABLE or INCOMPLETE

Parameters

entry:A node.

Return values

• true, if entry is in a reachable state.
• false, if entry is not in a reachable state.