[PATCH v3] Babel: Add option to support ecmp routes

[dxld at darkboxed.org]

On Thu, May 26, 2022 at 03:33:44PM +0200, Daniel Gröber wrote:
> Changes in v3:
>  - Squash with ecmp weigth patch
>  - Add babel_route_is_selected() as replacement for e->selected
>      I'm not totally sure the lazy approach is safe yet. We might need
>      additional bookeeping to reset r->active_nexthop on route
>      retraction/flush instead.

Forgot to mention:

  - Refactor route reload and use babel_announce_rte directly instead of
    via babel_select_route.

> +static void
> +babel_reconfigure_routes(struct babel_proto *p, struct fib *rtable)
> +{
> +  struct fib_iterator fit;
> +  FIB_ITERATE_INIT(&fit, rtable);
> +  FIB_ITERATE_START(rtable, &fit, struct babel_entry, e)
> +    babel_announce_rte(p, e);
> +  FIB_ITERATE_END;
> +}
> +
>  static int
>  babel_reconfigure(struct proto *P, struct proto_config *CF)
>  {
> @@ -2460,6 +2523,10 @@ babel_reconfigure(struct proto *P, struct proto_config *CF)
>    p->p.cf = CF;
>    babel_reconfigure_ifaces(p, new);
>  
> +  /* Update all routes to refresh ecmp settings. */
> +  babel_reconfigure_routes(p, &p->ip6_rtable);
> +  babel_reconfigure_routes(p, &p->ip4_rtable);
> +
>    babel_trigger_update(p);
>    babel_kick_timer(p);

--Daniel