ECMP/multipath support

[Joakim Tjernlund]

>
> > >> Something else, in calc_next_hop:
> > >> don't you need to return all next hops for ptmp links now that you
> > >> support ECMP?
> > >
> > >The same as in ptp or bcast - multiple next hops are created
> > >by compositing returns of calc_next_hop(). Look at the caller
> > >of calc_next_hop().
> >
> > Don't think it will work as intended(I am traveling and only have mail access)
> > but I think the find_neigh(ifa, rid);
> > will always find the same neighbor so any additional links
> > will be missed.
>
> Still think you need to do something like this:

This one doesn't require changes to originate_rt_lsa_body()
Just that the neighbour list doesn't change between originate_rt_lsa_body
and calc_next_hop.