Function grow_rtables

freebsd/net/route/route_tables.c:170–246

* Grows up the number of routing tables in the current fib. * Function creates new index array for all rtables and allocates * remaining routing tables. */

 *  remaining routing tables.
 */
static void
grow_rtables(uint32_t num_tables)
{
	struct domain *dom;
	struct rib_head **prnh, *rh;
	struct rib_head **new_rt_tables, **old_rt_tables;
	int family;

	RTABLES_LOCK_ASSERT();

	KASSERT(num_tables >= V_rt_numfibs, ("num_tables(%u) < rt_numfibs(%u)\n",
				num_tables, V_rt_numfibs));

	new_rt_tables = mallocarray(num_tables * (AF_MAX + 1), sizeof(void *),
	    M_RTABLE, M_WAITOK | M_ZERO);

	if ((num_tables > 1) && (V_rt_add_addr_allfibs == 0))
		printf("WARNING: Adding ifaddrs to all fibs has been turned off "
			"by default. Consider tuning %s if needed\n",
			"net.add_addr_allfibs");

#ifdef FIB_ALGO
	fib_grow_rtables(num_tables);
#endif

	/*
	 * Current rt_tables layout:
	 * fib0[af0, af1, af2, .., AF_MAX]fib1[af0, af1, af2, .., Af_MAX]..
	 * this allows to copy existing tables data by using memcpy()
	 */
	if (V_rt_tables != NULL)
		memcpy(new_rt_tables, V_rt_tables,
		    V_rt_numfibs * (AF_MAX + 1) * sizeof(void *));

	/* Populate the remainders */
	for (dom = domains; dom; dom = dom->dom_next) {
		if (dom->dom_rtattach == NULL)
			continue;
		family = dom->dom_family;
		for (int i = 0; i < num_tables; i++) {
			prnh = &new_rt_tables[i * (AF_MAX + 1) + family];
			if (*prnh != NULL)
				continue;
			rh = dom->dom_rtattach(i);
			if (rh == NULL)
				log(LOG_ERR, "unable to create routing table for %d.%d\n",
				    dom->dom_family, i);
#ifdef FIB_ALGO
			if (fib_select_algo_initial(rh) != 0) {
				log(LOG_ERR, "unable to select algo for table %d.%d\n",
				    dom->dom_family, i);
				// TODO: detach table
			}
#endif
			*prnh = rh;
		}
	}