void _handle_snd_mc_ra(gnrc_netif_t *netif)
{
gnrc_netif_acquire(netif);
assert(netif != NULL);
if (!gnrc_netif_is_6ln(netif)) {
bool final_ra = (netif->ipv6.ra_sent > (UINT8_MAX - NDP_MAX_FIN_RA_NUMOF));
uint32_t next_ra_time = random_uint32_range(NDP_MIN_RA_INTERVAL_MS,
NDP_MAX_RA_INTERVAL_MS);
uint32_t next_scheduled = _evtimer_lookup(netif, GNRC_IPV6_NIB_SND_MC_RA);
/* router has router advertising interface or the RA is one of the
* (now deactivated) routers final one (and there is no next
* scheduled within the possible time for next_ra_time) */
if ((final_ra && (next_scheduled > NDP_MAX_RA_INTERVAL_MS)) ||
gnrc_netif_is_rtr_adv(netif)) {
_snd_rtr_advs(netif, NULL, final_ra);
netif->ipv6.last_ra = (xtimer_now_usec64() / US_PER_MS) & UINT32_MAX;
if ((netif->ipv6.ra_sent < NDP_MAX_INIT_RA_NUMOF) || final_ra) {
if ((netif->ipv6.ra_sent < NDP_MAX_INIT_RA_NUMOF) &&
(next_ra_time > NDP_MAX_INIT_RA_INTERVAL)) {
next_ra_time = NDP_MAX_INIT_RA_INTERVAL;
}
netif->ipv6.ra_sent++;
}
/* netif->ipv6.ra_sent overflowed => this was our last final RA */
if (netif->ipv6.ra_sent != 0) {
_evtimer_add(netif, GNRC_IPV6_NIB_SND_MC_RA, &netif->ipv6.snd_mc_ra,
next_ra_time);
}
}
}
gnrc_netif_release(netif);
}
_nib_abr_entry_t *_handle_abro(const sixlowpan_nd_opt_abr_t *abro)
{
_nib_abr_entry_t *abr = NULL;
if (abro->len != SIXLOWPAN_ND_OPT_ABR_LEN) {
/* ignore silently */
return NULL;
}
abr = _nib_abr_add(&abro->braddr);
if (abr != NULL) {
uint32_t abro_version = sixlowpan_nd_opt_abr_get_version(abro);
uint16_t ltime = byteorder_ntohs(abro->ltime);
if (abr->version >= abro_version) {
abr->version = abro_version;
abr->valid_until = _now_min() + ltime;
}
/* correct for default value */
ltime = (ltime == 0) ? SIXLOWPAN_ND_OPT_ABR_LTIME_DEFAULT : ltime;
_evtimer_add(abr, GNRC_IPV6_NIB_ABR_TIMEOUT, &abr->timeout,
/* UINT16_MAX min < UINT32_MAX ms so no risk of overflow */
MS_PER_SEC * SEC_PER_MIN * ltime);
}
return abr;
}
void _handle_rereg_address(const ipv6_addr_t *addr)
{
gnrc_netif_t *netif = gnrc_netif_get_by_ipv6_addr(addr);
_nib_dr_entry_t *router = _nib_drl_get_dr();
const bool router_reachable = (router != NULL) &&
_is_reachable(router->next_hop);
if (router_reachable && (netif != NULL)) {
assert((unsigned)netif->pid == _nib_onl_get_if(router->next_hop));
DEBUG("nib: Re-registering %s",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)));
DEBUG(" with upstream router %s\n",
ipv6_addr_to_str(addr_str, &router->next_hop->ipv6,
sizeof(addr_str)));
_snd_ns(&router->next_hop->ipv6, netif, addr, &router->next_hop->ipv6);
}
else {
DEBUG("nib: Couldn't re-register %s, no current router found or address "
"wasn't assigned to any interface anymore.\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)));
}
if (netif != NULL) {
int idx = gnrc_netif_ipv6_addr_idx(netif, addr);
if (router_reachable &&
(_is_valid(netif, idx) || (_is_tentative(netif, idx) &&
(gnrc_netif_ipv6_addr_dad_trans(netif, idx) <
SIXLOWPAN_ND_REG_TRANSMIT_NUMOF)))) {
uint32_t retrans_time;
if (_is_valid(netif, idx)) {
retrans_time = SIXLOWPAN_ND_MAX_RS_SEC_INTERVAL * MS_PER_SEC;
}
else {
retrans_time = netif->ipv6.retrans_time;
/* increment encoded retransmission count */
netif->ipv6.addrs_flags[idx]++;
}
_evtimer_add(&netif->ipv6.addrs[idx], GNRC_IPV6_NIB_REREG_ADDRESS,
&netif->ipv6.addrs_timers[idx], retrans_time);
}
else {
netif->ipv6.rs_sent = 0;
_handle_search_rtr(netif);
}
}
}
void _handle_dad(const ipv6_addr_t *addr)
{
ipv6_addr_t sol_nodes;
gnrc_netif_t *netif = NULL;
int idx = _get_netif_state(&netif, addr);
if (idx >= 0) {
ipv6_addr_set_solicited_nodes(&sol_nodes, addr);
_snd_ns(addr, netif, &ipv6_addr_unspecified, &sol_nodes);
_evtimer_add((void *)addr, GNRC_IPV6_NIB_VALID_ADDR,
&netif->ipv6.addrs_timers[idx],
netif->ipv6.retrans_time);
}
if (netif != NULL) {
/* was acquired in `_get_netif_state()` */
gnrc_netif_release(netif);
}
}
uint8_t _handle_aro(gnrc_netif_t *netif, const ipv6_hdr_t *ipv6,
const icmpv6_hdr_t *icmpv6,
const sixlowpan_nd_opt_ar_t *aro, const ndp_opt_t *sl2ao,
_nib_onl_entry_t *nce)
{
assert(netif != NULL);
if (gnrc_netif_is_6ln(netif) && (aro->len == SIXLOWPAN_ND_OPT_AR_LEN)) {
DEBUG("nib: valid ARO received\n");
DEBUG(" - length: %u\n", aro->len);
DEBUG(" - status: %u\n", aro->status);
DEBUG(" - registration lifetime: %u\n", byteorder_ntohs(aro->ltime));
DEBUG(" - EUI-64: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
aro->eui64.uint8[0], aro->eui64.uint8[1], aro->eui64.uint8[2],
aro->eui64.uint8[3], aro->eui64.uint8[4], aro->eui64.uint8[5],
aro->eui64.uint8[6], aro->eui64.uint8[7]);
if (icmpv6->type == ICMPV6_NBR_ADV) {
if (!_is_iface_eui64(netif, &aro->eui64)) {
DEBUG("nib: ARO EUI-64 is not mine, ignoring ARO\n");
return _ADDR_REG_STATUS_IGNORE;
}
switch (aro->status) {
case SIXLOWPAN_ND_STATUS_SUCCESS: {
uint16_t ltime = byteorder_ntohs(aro->ltime);
uint32_t rereg_time;
int idx = gnrc_netif_ipv6_addr_idx(netif, &ipv6->dst);
/* if ltime 1min, reschedule NS in 30sec, otherwise 1min
* before timeout */
rereg_time = (ltime == 1U) ? (30 * MS_PER_SEC) :
(ltime - 1U) * SEC_PER_MIN * MS_PER_SEC;
DEBUG("nib: Address registration of %s successful. "
"Scheduling re-registration in %" PRIu32 "ms\n",
ipv6_addr_to_str(addr_str, &ipv6->dst,
sizeof(addr_str)), rereg_time);
netif->ipv6.addrs_flags[idx] &= ~GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_MASK;
netif->ipv6.addrs_flags[idx] |= GNRC_NETIF_IPV6_ADDRS_FLAGS_STATE_VALID;
_evtimer_add(&netif->ipv6.addrs[idx],
GNRC_IPV6_NIB_REREG_ADDRESS,
&netif->ipv6.addrs_timers[idx],
rereg_time);
break;
}
case SIXLOWPAN_ND_STATUS_DUP:
DEBUG("nib: Address registration reports duplicate. "
"Removing address %s%%%u\n",
ipv6_addr_to_str(addr_str,
&ipv6->dst,
sizeof(addr_str)), netif->pid);
gnrc_netif_ipv6_addr_remove_internal(netif, &ipv6->dst);
/* TODO: generate new address */
break;
case SIXLOWPAN_ND_STATUS_NC_FULL: {
DEBUG("nib: Router's neighbor cache is full. "
"Searching new router for DAD\n");
_nib_dr_entry_t *dr = _nib_drl_get(&ipv6->src, netif->pid);
assert(dr != NULL); /* otherwise we wouldn't be here */
_nib_drl_remove(dr);
if (_nib_drl_iter(NULL) == NULL) { /* no DRL left */
netif->ipv6.rs_sent = 0;
/* search (hopefully) new router */
_handle_search_rtr(netif);
}
else {
assert(dr->next_hop != NULL);
_handle_rereg_address(&ipv6->dst);
}
}
break;
}
return aro->status;
}
#if GNRC_IPV6_NIB_CONF_6LR
else if (gnrc_netif_is_6lr(netif) &&
(icmpv6->type == ICMPV6_NBR_SOL)) {
return _reg_addr_upstream(netif, ipv6, icmpv6, aro, sl2ao, nce);
}
#else /* GNRC_IPV6_NIB_CONF_6LR */
(void)sl2ao;
(void)nce;
#endif /* GNRC_IPV6_NIB_CONF_6LR */
}
#if ENABLE_DEBUG
else if (aro->len != SIXLOWPAN_ND_OPT_AR_LEN) {
DEBUG("nib: ARO of unexpected length %u, ignoring ARO\n", aro->len);
}
#endif /* ENABLE_DEBUG */
return _ADDR_REG_STATUS_IGNORE;
}