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Merge pull request #3957 from OlegHahm/6lowpan_DO_gc

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6lowpan: do garbage collect unreachable NCEs
This commit is contained in:
Oleg Hahm 2015-09-24 17:57:17 +02:00
commit aba11407f1
1 changed files with 11 additions and 13 deletions
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24
sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
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@ -678,19 +678,17 @@ void gnrc_ndp_retrans_nbr_sol(gnrc_ipv6_nc_t *nc_entry)
}
}
else if (nc_entry->probes_remaining <= 1) {
#ifdef MODULE_GNRC_SIXLOWPAN_ND_ROUTER
if (nc_entry->iface != KERNEL_PID_UNDEF) {
gnrc_ipv6_netif_t *ipv6_iface = gnrc_ipv6_netif_get(nc_entry->iface);
if ((ipv6_iface->flags & GNRC_IPV6_NETIF_FLAGS_SIXLOWPAN) &&
(ipv6_iface->flags & GNRC_IPV6_NETIF_FLAGS_ROUTER) &&
(gnrc_ipv6_nc_get_type(nc_entry) != GNRC_IPV6_NC_TYPE_GC)) {
/* don't remove non-gc entrys on 6LRs:
* https://tools.ietf.org/html/rfc6775#section-6 */
gnrc_ndp_internal_set_state(nc_entry, GNRC_IPV6_NC_STATE_UNREACHABLE);
return;
}
}
#endif
/* For a 6LoWPAN router entries may be set to UNREACHABLE instead
* of removing them, since RFC6775, section 6
* (https://tools.ietf.org/html/rfc6775#section-6) says: "if NUD on
* the router determines that the host is UNREACHABLE (based on the
* logic in [RFC4861]), the NCE SHOULD NOT be deleted but rather
* retained until the Registration Lifetime expires." However, this
* "SHOULD NOT" is not implemented to circumvent NCEs going into
* UNREACHABLE forever and in order to save some memory in the
* neighbor cache. */
DEBUG("ndp: Remove nc entry %s for interface %" PRIkernel_pid "\n",
ipv6_addr_to_str(addr_str, &nc_entry->ipv6_addr, sizeof(addr_str)),
nc_entry->iface);