/*---------------------------------------------------------------------------*/
void
uip_ds6_link_neighbor_callback(int status, int numtx)
{
const linkaddr_t *dest = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
if(linkaddr_cmp(dest, &linkaddr_null)) {
return;
}
LINK_NEIGHBOR_CALLBACK(dest, status, numtx);
#if UIP_DS6_LL_NUD
if(status == MAC_TX_OK) {
uip_ds6_nbr_t *nbr;
nbr = uip_ds6_nbr_ll_lookup((uip_lladdr_t *)dest);
if(nbr != NULL &&
(nbr->state == NBR_STALE || nbr->state == NBR_DELAY ||
nbr->state == NBR_PROBE)) {
nbr->state = NBR_REACHABLE;
stimer_set(&nbr->reachable, UIP_ND6_REACHABLE_TIME / 1000);
PRINTF("uip-ds6-neighbor : received a link layer ACK : ");
PRINTLLADDR((uip_lladdr_t *)dest);
PRINTF(" is reachable.\n");
}
}
#endif /* UIP_DS6_LL_NUD */
}
/*---------------------------------------------------------------------------*/
void
uip_ds6_link_neighbor_callback(int status, int numtx)
{
const linkaddr_t *dest = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
if(linkaddr_cmp(dest, &linkaddr_null)) {
return;
}
LINK_NEIGHBOR_CALLBACK(dest, status, numtx);
#if UIP_DS6_LL_NUD
/* From RFC4861, page 72, last paragraph of section 7.3.3:
*
* "In some cases, link-specific information may indicate that a path to
* a neighbor has failed (e.g., the resetting of a virtual circuit). In
* such cases, link-specific information may be used to purge Neighbor
* Cache entries before the Neighbor Unreachability Detection would do
* so. However, link-specific information MUST NOT be used to confirm
* the reachability of a neighbor; such information does not provide
* end-to-end confirmation between neighboring IP layers."
*
* However, we assume that receiving a link layer ack ensures the delivery
* of the transmitted packed to the IP stack of the neighbour. This is a
* fair assumption and allows battery powered nodes save some battery by
* not re-testing the state of a neighbour periodically if it
* acknowledges link packets. */
if(status == MAC_TX_OK) {
uip_ds6_nbr_t *nbr;
nbr = uip_ds6_nbr_ll_lookup((uip_lladdr_t *)dest);
if(nbr != NULL && nbr->state != NBR_INCOMPLETE) {
nbr->state = NBR_REACHABLE;
stimer_set(&nbr->reachable, UIP_ND6_REACHABLE_TIME / 1000);
PRINTF("uip-ds6-neighbor : received a link layer ACK : ");
PRINTLLADDR((uip_lladdr_t *)dest);
PRINTF(" is reachable.\n");
}
}
#endif /* UIP_DS6_LL_NUD */
}
