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Merge pull request #836 from lebrush/nbr-ll-nup

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uip-ds6-nbr: consider reachable node if LL-NUD
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Nicolas Tsiftes 2014-12-01 18:12:33 +01:00
commit d3d33c5699
1 changed files with 16 additions and 3 deletions
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19
core/net/ipv6/uip-ds6-nbr.c
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@ -201,12 +201,25 @@ uip_ds6_link_neighbor_callback(int status, int numtx)
LINK_NEIGHBOR_CALLBACK(dest, status, numtx); LINK_NEIGHBOR_CALLBACK(dest, status, numtx);
#if UIP_DS6_LL_NUD #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) { if(status == MAC_TX_OK) {
uip_ds6_nbr_t *nbr; uip_ds6_nbr_t *nbr;
nbr = uip_ds6_nbr_ll_lookup((uip_lladdr_t *)dest); nbr = uip_ds6_nbr_ll_lookup((uip_lladdr_t *)dest);
if(nbr != NULL && if(nbr != NULL && nbr->state != NBR_INCOMPLETE) {
(nbr->state == NBR_STALE || nbr->state == NBR_DELAY ||
nbr->state == NBR_PROBE)) {
nbr->state = NBR_REACHABLE; nbr->state = NBR_REACHABLE;
stimer_set(&nbr->reachable, UIP_ND6_REACHABLE_TIME / 1000); stimer_set(&nbr->reachable, UIP_ND6_REACHABLE_TIME / 1000);
PRINTF("uip-ds6-neighbor : received a link layer ACK : "); PRINTF("uip-ds6-neighbor : received a link layer ACK : ");