[riot-notifications] [RIOT] gnrc_ndp_router: Initial import of router behavior of router discovery (#3049)

[Oleg Hahm]

> @@ -275,6 +275,70 @@ void gnrc_ndp_nbr_adv_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
>      return;
>  }
>  
> +#if (defined(MODULE_GNRC_NDP_ROUTER) || defined(MODULE_GNRC_SIXLOWPAN_ND_ROUTER))
> +void gnrc_ndp_rtr_sol_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
> +                             ipv6_hdr_t *ipv6, ndp_rtr_sol_t *rtr_sol,
> +                             size_t icmpv6_size)
> +{
> +    gnrc_ipv6_netif_t *if_entry = gnrc_ipv6_netif_get(iface);
> +    assert(if_entry != NULL);

I think we can save the memory for the assert here, if the node should crash in the next line anyway if `if_entry` is NULL.

---
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https://github.com/RIOT-OS/RIOT/pull/3049/files#r38557404
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