[riot-notifications] [RIOT] gnrc_sixlowpan_nd: initial import of host behavior of 6LoWPAN-ND (#3748)

[Martine Lenders]

> +    }
> +#endif
> +    /* next hop determination according to: https://tools.ietf.org/html/rfc6775#section-5.6 */
> +    if ((next_hop == NULL) && ipv6_addr_is_link_local(dst)) {   /* prefix is "on-link" */
> +        /* multicast is not handled here anyway so we don't need to check that */
> +        next_hop = dst;
> +    }
> +    else if (next_hop == NULL) {                                /* prefix is off-link */
> +        next_hop = gnrc_ndp_internal_default_router();
> +    }
> +
> +    /* address resolution of next_hop: https://tools.ietf.org/html/rfc6775#section-5.7 */
> +    if (ipv6_addr_is_link_local(next_hop)) {
> +        kernel_pid_t ifs[GNRC_NETIF_NUMOF];
> +        size_t ifnum = gnrc_netif_get(ifs);
> +        assert(ifnum == 1); /* 6LoWPAN hosts should only have one IEEE 802.15.4 interface */

@OlegHahm:
> Besides, checking a static precondition at runtime is inefficient and it seems also be done here inside a arbitrary function.

You are right, I remove that check and just assume it for the return value.


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https://github.com/RIOT-OS/RIOT/pull/3748/files#r38915574
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