gnrc_ipv6_nc: adapt neighbor cache for different ND implementations

sys/include/net/gnrc/ipv6/nc.h

@@ -25,6 +25,7 @@
 #include <stdint.h>
 
 #include "kernel_types.h"
+#include "net/eui64.h"
 #include "net/ipv6/addr.h"
 #include "net/gnrc/netif.h"
 #include "net/gnrc/pktqueue.h"
@@ -118,7 +119,9 @@ extern "C" {
  *          </a>.
  */
 typedef struct {
+#ifdef MODULE_GNRC_NDP_NODE
     gnrc_pktqueue_t *pkts;                      /**< Packets waiting for address resolution */
+#endif
     ipv6_addr_t ipv6_addr;                      /**< IPv6 address of the neighbor */
     uint8_t l2_addr[GNRC_IPV6_NC_L2_ADDR_MAX];  /**< Link layer address of the neighbor */
     uint8_t l2_addr_len;                        /**< Length of gnrc_ipv6_nc_t::l2_addr */
@@ -143,6 +146,15 @@ typedef struct {
      */
     vtimer_t nbr_adv_timer;
 
+#ifdef MODULE_GNRC_SIXLOWPAN_ND
+    vtimer_t rtr_sol_timer; /**< Retransmission timer for unicast router solicitations */
+#endif
+#ifdef MODULE_GNRC_SIXLOWPAN_ND_ROUTER
+    vtimer_t type_timeout;                  /**< Timer for type transissions */
+    eui64_t eui64;                          /**< the unique EUI-64 of the neighbor (might be
+                                             *   different from L2 address, if l2_addr_len == 2) */
+#endif
+
     uint8_t probes_remaining;               /**< remaining number of unanswered probes */
     /**
      * @}

sys/net/gnrc/network_layer/ipv6/nc/gnrc_ipv6_nc.c

@@ -102,7 +102,9 @@ gnrc_ipv6_nc_t *gnrc_ipv6_nc_add(kernel_pid_t iface, const ipv6_addr_t *ipv6_add
     /* Otherwise, fill free entry with your fresh information */
     free_entry->iface = iface;
 
+#ifdef MODULE_GNRC_NDP_NODE
     free_entry->pkts = NULL;
+#endif
     memcpy(&(free_entry->ipv6_addr), ipv6_addr, sizeof(ipv6_addr_t));
     DEBUG("ipv6_nc: Register %s for interface %" PRIkernel_pid,
           ipv6_addr_to_str(addr_str, ipv6_addr, sizeof(addr_str)),
@@ -137,13 +139,19 @@ void gnrc_ipv6_nc_remove(kernel_pid_t iface, const ipv6_addr_t *ipv6_addr)
               ipv6_addr_to_str(addr_str, ipv6_addr, sizeof(addr_str)),
               iface);
 
+#ifdef MODULE_GNRC_NDP_NODE
         while (entry->pkts != NULL) {
-#ifdef MODULE_GNRC_PKTBUF
             gnrc_pktbuf_release(entry->pkts->pkt);
-#endif
             entry->pkts->pkt = NULL;
             gnrc_pktqueue_remove_head(&entry->pkts);
         }
+#endif
+#ifdef MODULE_GNRC_SIXLOWPAN_ND
+        vtimer_remove(&entry->rtr_sol_timer);
+#endif
+#ifdef MODULE_GNRC_SIXLOWPAN_ND_ROUTER
+        vtimer_remove(&entry->type_timeout);
+#endif
 
         ipv6_addr_set_unspecified(&(entry->ipv6_addr));
         entry->iface = KERNEL_PID_UNDEF;

sys/net/gnrc/network_layer/ndp/gnrc_ndp.c

@@ -195,8 +195,6 @@ void gnrc_ndp_nbr_adv_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
 
     if (l2tgt_len != -ENOTSUP) {
         if (gnrc_ipv6_nc_get_state(nc_entry) == GNRC_IPV6_NC_STATE_INCOMPLETE) {
-            gnrc_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) */
@@ -221,11 +219,13 @@ void gnrc_ndp_nbr_adv_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
                 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) {
                 gnrc_netapi_send(gnrc_ipv6_pid, queued_pkt->pkt);
                 queued_pkt->pkt = NULL;
             }
+#endif
         }
         else {
             /* first or-term: no link-layer, but nc_entry has l2addr,