Implement Neighbor Set

[jeandudey]

The neighbor set contains information about neighboring AODVv2 routers, this differs from the NIB on RIOT-OS which is specific to link local nodes and NDP itself.

Having a complete implementation could give more benefits as outlined in the draft, although not explicitly needed.

I'm currently working on the Local Route Set, if anyone is willing to work on this feel free to comment here and take a look.

A possible implementation of the entries would look like this:

/**
 * @brief   Neighbor Set entry
 * 
 * @see <a href="https://tools.ietf.org/html/draft-perkins-manet-aodvv2-03#section-4.3">
 *          draft-perkins-manet-aodvv2-03, Section 4.3. Neighbor Set
 *      </a>
 */
typedef struct {
    /**
     * @brief   An IP address of the neighboring router.
     */
    ipv6_addr_t address;
    /**
     * @brief   Indicates whether the link to the neighbor is bidirectional.
     */
    uint8_t state;
    /**
     * @brief   Indicates the time at which the Neighbor.State should be updated:
     */
    timex_t timeout; 
    /**
     * @brief   The interface on which the link to the neighbor was established.
     */
    gnrc_netif_t *interface;
    aodvv2_seqnum_t ack_seqnum;
    aodvv2_seqnum_t heard_rerr_seqnum;
} aodvv2_neighbor_t;

Further reading

• draft-perkins-manet-aodvv2-03, Section 4.3. Neighbor Set