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Recursive route nexthop updates now announced with valid new_best/old_best information

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This commit is contained in:
Maria Matejka 2021-02-25 21:52:49 +01:00
parent f23f014ef3
commit ef95b3c7c8
1 changed files with 42 additions and 35 deletions
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77
nest/rt-table.c
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@ -412,7 +412,7 @@ rte_mergable(struct rte_storage *pri, struct rte_storage *sec)
}
static void
rte_trace(struct channel *c, rte *e, int dir, char *msg)
rte_trace(struct channel *c, rte *e, int dir, const char *msg)
{
log(L_TRACE "%s.%s %c %s %N %s",
c->proto->name, c->name ?: "?", dir, msg, e->net,
@ -420,14 +420,14 @@ rte_trace(struct channel *c, rte *e, int dir, char *msg)
}
static inline void
rte_trace_in(uint flag, struct channel *c, rte *e, char *msg)
rte_trace_in(uint flag, struct channel *c, rte *e, const char *msg)
{
if ((c->debug & flag) || (c->proto->debug & flag))
rte_trace(c, e, '>', msg);
}
static inline void
rte_trace_out(uint flag, struct channel *c, rte *e, char *msg)
rte_trace_out(uint flag, struct channel *c, rte *e, const char *msg)
{
if ((c->debug & flag) || (c->proto->debug & flag))
rte_trace(c, e, '<', msg);
@ -1954,9 +1954,8 @@ rt_next_hop_update_rte(struct rte_storage *old)
static inline int
rt_next_hop_update_net(rtable *tab, net *n)
{
struct rte_storage *new, **new_best;
struct rte_storage *new;
int count = 0;
int free_old_best = 0;
struct rte_storage *old_best = n->routes;
if (!old_best)
@ -1964,32 +1963,40 @@ rt_next_hop_update_net(rtable *tab, net *n)
for (struct rte_storage **k = &n->routes, *e; e = *k; k = &e->next)
if (rta_next_hop_outdated(e->attrs))
{
new = rt_next_hop_update_rte(e);
new->next = e->next;
*k = new;
rte_announce_i(tab, RA_ANY, n, new, e, NULL, NULL);
/* Call a pre-comparison hook */
/* Not really an efficient way to compute this */
if (e->src->proto->rte_recalculate)
e->src->proto->rte_recalculate(tab, n, new, e, NULL);
if (e != old_best)
rte_free(e);
else /* Freeing of the old best rte is postponed */
free_old_best = 1;
e = new;
count++;
}
count++;
if (!count)
return 0;
struct rte_multiupdate {
struct rte_storage *old, *new;
} *updates = alloca(sizeof(struct rte_multiupdate) * count);
int pos = 0;
for (struct rte_storage **k = &n->routes, *e; e = *k; k = &e->next)
if (rta_next_hop_outdated(e->attrs))
{
struct rte_storage *new = rt_next_hop_update_rte(e);
/* Call a pre-comparison hook */
/* Not really an efficient way to compute this */
if (e->src->proto->rte_recalculate)
e->src->proto->rte_recalculate(tab, n, new, e, old_best);
updates[pos++] = (struct rte_multiupdate) {
.old = e,
.new = new,
};
/* Replace the route in the list */
new->next = e->next;
*k = e = new;
}
ASSERT_DIE(pos == count);
/* Find the new best route */
new_best = NULL;
struct rte_storage **new_best = NULL;
for (struct rte_storage **k = &n->routes, *e; e = *k; k = &e->next)
{
if (!new_best || rte_better(e, *new_best))
@ -2005,18 +2012,18 @@ rt_next_hop_update_net(rtable *tab, net *n)
n->routes = new;
}
/* Announce the new best route */
if (new != old_best)
/* Announce the changes */
for (int i=0; i<count; i++)
{
rte nloc = rte_copy(new);
rte_trace_in(D_ROUTES, new->sender, &nloc, "updated [best]");
_Bool nb = (*new_best == updates[i].new), ob = (old_best == updates[i].old);
const char *best_indicator[2][2] = { { "updated", "updated [-best]" }, { "updated [+best]", "updated [best]" } };
rte nloc = rte_copy(updates[i].new);
rte_trace_in(D_ROUTES, new->sender, &nloc, best_indicator[nb][ob]);
rte_announce_i(tab, RA_UNDEF, n, updates[i].new, updates[i].old, *new_best, old_best);
}
/* Propagate changes */
rte_announce_i(tab, RA_UNDEF, n, NULL, NULL, n->routes, old_best);
if (free_old_best)
rte_free(old_best);
for (int i=0; i<count; i++)
rte_free(updates[i].old);
return count;
}