void ng_ndp_nbr_adv_handle(kernel_pid_t iface, ng_pktsnip_t *pkt,
ng_ipv6_hdr_t *ipv6, ng_ndp_nbr_adv_t *nbr_adv,
size_t icmpv6_size)
{
uint16_t opt_offset = 0;
uint8_t *buf = ((uint8_t *)nbr_adv) + sizeof(ng_ndp_nbr_adv_t);
int l2tgt_len = 0;
uint8_t l2tgt[NG_IPV6_NC_L2_ADDR_MAX];
int sicmpv6_size = (int)icmpv6_size;
ng_ipv6_nc_t *nc_entry = ng_ipv6_nc_get(iface, &nbr_adv->tgt);
ng_pktsnip_t *netif;
ng_netif_hdr_t *netif_hdr = NULL;
DEBUG("ndp: received neighbor advertisement (src: %s, ",
ng_ipv6_addr_to_str(addr_str, &ipv6->src, sizeof(addr_str)));
DEBUG("dst: %s, ",
ng_ipv6_addr_to_str(addr_str, &ipv6->dst, sizeof(addr_str)));
DEBUG("tgt: %s)\n",
ng_ipv6_addr_to_str(addr_str, &nbr_adv->tgt, sizeof(addr_str)));
/* check validity */
if ((ipv6->hl != 255) || (nbr_adv->code != 0) ||
(icmpv6_size < sizeof(ng_ndp_nbr_adv_t)) ||
ng_ipv6_addr_is_multicast(&nbr_adv->tgt)) {
DEBUG("ndp: neighbor advertisement was invalid.\n");
/* ipv6 releases */
return;
}
if (nc_entry == NULL) {
/* see https://tools.ietf.org/html/rfc4861#section-7.2.5 */
DEBUG("ndp: no neighbor cache entry found for advertisement's target\n");
/* ipv6 releases */
return;
}
sicmpv6_size -= sizeof(ng_ndp_nbr_adv_t);
while (sicmpv6_size > 0) {
ng_ndp_opt_t *opt = (ng_ndp_opt_t *)(buf + opt_offset);
switch (opt->type) {
case NG_NDP_OPT_TL2A:
if ((l2tgt_len = _handle_tl2a_opt(pkt, ipv6, nbr_adv->type, opt,
l2tgt)) < 0) {
/* invalid target link-layer address option */
return;
}
break;
default:
/* silently discard all other options */
break;
}
opt_offset += (opt->len * 8);
sicmpv6_size -= (opt->len * 8);
}
LL_SEARCH_SCALAR(pkt, netif, type, NG_NETTYPE_NETIF);
if (netif != NULL) {
netif_hdr = netif->data;
}
if (ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_INCOMPLETE) {
ng_pktqueue_t *queued_pkt;
if (_pkt_has_l2addr(netif_hdr) && (l2tgt_len == 0)) {
/* link-layer has addresses, but no TLLAO supplied: discard silently
* (see https://tools.ietf.org/html/rfc4861#section-7.2.5) */
return;
}
nc_entry->iface = iface;
nc_entry->l2_addr_len = l2tgt_len;
memcpy(nc_entry->l2_addr, l2tgt, l2tgt_len);
if (nbr_adv->flags & NG_NDP_NBR_ADV_FLAGS_S) {
_set_state(nc_entry, NG_IPV6_NC_STATE_REACHABLE);
}
else {
_set_state(nc_entry, NG_IPV6_NC_STATE_STALE);
}
if (nbr_adv->flags & NG_NDP_NBR_ADV_FLAGS_R) {
nc_entry->flags |= NG_IPV6_NC_IS_ROUTER;
}
else {
nc_entry->flags &= ~NG_IPV6_NC_IS_ROUTER;
/* TODO: update FIB */
}
while ((queued_pkt = ng_pktqueue_remove_head(&nc_entry->pkts)) != NULL) {
ng_netapi_send(ng_ipv6_pid, queued_pkt->pkt);
queued_pkt->pkt = NULL;
}
}
else {
/* first or-term: no link-layer, but nc_entry has l2addr,
* second or-term: different l2addr cached */
bool l2tgt_changed = false;
if ((!_pkt_has_l2addr(netif_hdr)) && (l2tgt_len == 0)) {
/* there was previously a L2 address registered */
l2tgt_changed = (nc_entry->l2_addr_len != 0);
}
/* link-layer has addresses and TLLAO with different address */
else if (_pkt_has_l2addr(netif_hdr) && (l2tgt_len != 0)) {
l2tgt_changed = (!(l2tgt_len == nc_entry->l2_addr_len)) &&
(memcmp(nc_entry->l2_addr, l2tgt, l2tgt_len) == 0);
}
if ((nbr_adv->flags & NG_NDP_NBR_ADV_FLAGS_O) || !l2tgt_changed ||
(l2tgt_len == 0)) {
if (l2tgt_len != 0) {
nc_entry->iface = iface;
nc_entry->l2_addr_len = l2tgt_len;
memcpy(nc_entry->l2_addr, l2tgt, l2tgt_len);
}
if (nbr_adv->flags & NG_NDP_NBR_ADV_FLAGS_S) {
_set_state(nc_entry, NG_IPV6_NC_STATE_REACHABLE);
}
else if (l2tgt_changed && (l2tgt_len != 0)) {
_set_state(nc_entry, NG_IPV6_NC_STATE_STALE);
}
if (nbr_adv->flags & NG_NDP_NBR_ADV_FLAGS_R) {
nc_entry->flags |= NG_IPV6_NC_IS_ROUTER;
}
else {
nc_entry->flags &= ~NG_IPV6_NC_IS_ROUTER;
/* TODO: update FIB */
}
}
else if (l2tgt_changed) {
if (ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_REACHABLE) {
_set_state(nc_entry, NG_IPV6_NC_STATE_STALE);
}
}
}
return;
}
void gnrc_ndp_nbr_adv_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
ipv6_hdr_t *ipv6, ndp_nbr_adv_t *nbr_adv,
size_t icmpv6_size)
{
uint16_t opt_offset = 0;
uint8_t *buf = ((uint8_t *)nbr_adv) + sizeof(ndp_nbr_adv_t);
int l2tgt_len = 0;
uint8_t l2tgt[GNRC_IPV6_NC_L2_ADDR_MAX];
int sicmpv6_size = (int)icmpv6_size;
gnrc_ipv6_nc_t *nc_entry = gnrc_ipv6_nc_get(iface, &nbr_adv->tgt);
gnrc_pktsnip_t *netif;
gnrc_netif_hdr_t *netif_hdr = NULL;
DEBUG("ndp: received neighbor advertisement (src: %s, ",
ipv6_addr_to_str(addr_str, &ipv6->src, sizeof(addr_str)));
DEBUG("dst: %s, ",
ipv6_addr_to_str(addr_str, &ipv6->dst, sizeof(addr_str)));
DEBUG("tgt: %s)\n",
ipv6_addr_to_str(addr_str, &nbr_adv->tgt, sizeof(addr_str)));
/* check validity */
if ((ipv6->hl != 255) || (nbr_adv->code != 0) ||
(icmpv6_size < sizeof(ndp_nbr_adv_t)) ||
ipv6_addr_is_multicast(&nbr_adv->tgt)) {
DEBUG("ndp: neighbor advertisement was invalid.\n");
/* ipv6 releases */
return;
}
if (nc_entry == NULL) {
/* see https://tools.ietf.org/html/rfc4861#section-7.2.5 */
DEBUG("ndp: no neighbor cache entry found for advertisement's target\n");
/* ipv6 releases */
return;
}
sicmpv6_size -= sizeof(ndp_nbr_adv_t);
while (sicmpv6_size > 0) {
ndp_opt_t *opt = (ndp_opt_t *)(buf + opt_offset);
switch (opt->type) {
case NDP_OPT_TL2A:
if ((l2tgt_len = gnrc_ndp_internal_tl2a_opt_handle(pkt, ipv6, nbr_adv->type, opt, l2tgt)) < 0) {
/* invalid target link-layer address option */
return;
}
break;
#ifdef MODULE_GNRC_SIXLOWPAN_ND
case NDP_OPT_AR:
/* address registration option is always ignored when invalid */
gnrc_sixlowpan_nd_opt_ar_handle(iface, ipv6, nbr_adv->type,
&nbr_adv->tgt,
(sixlowpan_nd_opt_ar_t *)opt,
NULL, 0);
break;
#endif
default:
/* silently discard all other options */
break;
}
opt_offset += (opt->len * 8);
sicmpv6_size -= (opt->len * 8);
#if ENABLE_DEBUG
if (sicmpv6_size < 0) {
DEBUG("ndp: Option parsing out of sync.\n");
}
#endif
}
LL_SEARCH_SCALAR(pkt, netif, type, GNRC_NETTYPE_NETIF);
if (netif != NULL) {
netif_hdr = netif->data;
}
if (l2tgt_len != -ENOTSUP) {
#ifdef MODULE_GNRC_SIXLOWPAN_ND
/* check if entry wasn't removed by ARO, ideally there should not be any TL2A in here */
nc_entry = gnrc_ipv6_nc_get(iface, &nbr_adv->tgt);
if (nc_entry == NULL) {
return;
}
#endif
if (gnrc_ipv6_nc_get_state(nc_entry) == GNRC_IPV6_NC_STATE_INCOMPLETE) {
if (_pkt_has_l2addr(netif_hdr) && (l2tgt_len == 0)) {
/* link-layer has addresses, but no TLLAO supplied: discard silently
* (see https://tools.ietf.org/html/rfc4861#section-7.2.5) */
return;
}
nc_entry->iface = iface;
nc_entry->l2_addr_len = l2tgt_len;
memcpy(nc_entry->l2_addr, l2tgt, l2tgt_len);
if (nbr_adv->flags & NDP_NBR_ADV_FLAGS_S) {
gnrc_ndp_internal_set_state(nc_entry, GNRC_IPV6_NC_STATE_REACHABLE);
}
else {
gnrc_ndp_internal_set_state(nc_entry, GNRC_IPV6_NC_STATE_STALE);
}
if (nbr_adv->flags & NDP_NBR_ADV_FLAGS_R) {
nc_entry->flags |= GNRC_IPV6_NC_IS_ROUTER;
}
else {
nc_entry->flags &= ~GNRC_IPV6_NC_IS_ROUTER;
/* TODO: update state of neighbor as router in FIB? */
}
#ifdef MODULE_GNRC_NDP_NODE
gnrc_pktqueue_t *queued_pkt;
while ((queued_pkt = gnrc_pktqueue_remove_head(&nc_entry->pkts)) != NULL) {
if (gnrc_netapi_send(gnrc_ipv6_pid, queued_pkt->pkt) < 1) {
DEBUG("ndp: unable to send queued packet\n");
gnrc_pktbuf_release(queued_pkt->pkt);
}
queued_pkt->pkt = NULL;
}
#endif
}
else {
/* first or-term: no link-layer, but nc_entry has l2addr,
* second or-term: different l2addr cached */
bool l2tgt_changed = false;
if ((!_pkt_has_l2addr(netif_hdr)) && (l2tgt_len == 0)) {
/* there was previously a L2 address registered */
l2tgt_changed = (nc_entry->l2_addr_len != 0);
}
/* link-layer has addresses and TLLAO with different address */
else if (_pkt_has_l2addr(netif_hdr) && (l2tgt_len != 0)) {
l2tgt_changed = (!(l2tgt_len == nc_entry->l2_addr_len)) &&
(memcmp(nc_entry->l2_addr, l2tgt, l2tgt_len) == 0);
}
if ((nbr_adv->flags & NDP_NBR_ADV_FLAGS_O) || !l2tgt_changed ||
(l2tgt_len == 0)) {
if (l2tgt_len != 0) {
nc_entry->iface = iface;
nc_entry->l2_addr_len = l2tgt_len;
memcpy(nc_entry->l2_addr, l2tgt, l2tgt_len);
}
if (nbr_adv->flags & NDP_NBR_ADV_FLAGS_S) {
gnrc_ndp_internal_set_state(nc_entry, GNRC_IPV6_NC_STATE_REACHABLE);
}
else if (l2tgt_changed) {
gnrc_ndp_internal_set_state(nc_entry, GNRC_IPV6_NC_STATE_STALE);
}
if (nbr_adv->flags & NDP_NBR_ADV_FLAGS_R) {
nc_entry->flags |= GNRC_IPV6_NC_IS_ROUTER;
}
else {
nc_entry->flags &= ~GNRC_IPV6_NC_IS_ROUTER;
/* TODO: update state of neighbor as router in FIB? */
}
}
else if (l2tgt_changed &&
gnrc_ipv6_nc_get_state(nc_entry) == GNRC_IPV6_NC_STATE_REACHABLE) {
gnrc_ndp_internal_set_state(nc_entry, GNRC_IPV6_NC_STATE_STALE);
}
}
}
return;
}
