[Babel-users] Betweenness centrality: extend ROUTE UPDATE

[Matthieu Boutier]

Hi Lorenzo,

> Is this the right place where to ask?

Yes.

> how to get the routing table entry matching a given prefix...

You must iterate over all the routing entries with "route streams" and search the one you want (or write your own function).  For example:

    struct babel_route *rt = NULL;
    struct route_stream *stream = NULL;
    stream = route_stream(ROUTE_INSTALLED); /* or _ALL, or _SS_INSTALLED */
    while(1) {
        rt = route_stream_next(stream);
        if(rt == NULL) break;
        /* your code */
        min = min_route(rt, min);
    }
    route_stream_done(stream);

To compare prefixes, you can use prefix_cmp from util.h.  For your use case, it should be:

if(prefix_cmp(rt->src->prefix, rt->src->plen, prefix, plen) == PST_MORE_SPECIFIC)) {
    /* the RIB entry is more specific than my <prefix,plen> prefix*/
}

Best regards,
Matthieu