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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 1e76f6e954
commit 575da88f7a
1 changed files with 46 additions and 38 deletions
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84
nest/rt-table.c
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@ -349,7 +349,7 @@ rte_mergable(rte *pri, rte *sec)
} }
static void 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 %uL %uG %s", log(L_TRACE "%s.%s %c %s %N %uL %uG %s",
c->proto->name, c->name ?: "?", dir, msg, e->net, e->src->private_id, e->src->global_id, c->proto->name, c->name ?: "?", dir, msg, e->net, e->src->private_id, e->src->global_id,
@ -357,14 +357,14 @@ rte_trace(struct channel *c, rte *e, int dir, char *msg)
} }
static inline void 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)) if ((c->debug & flag) || (c->proto->debug & flag))
rte_trace(c, e, '>', msg); rte_trace(c, e, '>', msg);
} }
static inline void 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)) if ((c->debug & flag) || (c->proto->debug & flag))
rte_trace(c, e, '<', msg); rte_trace(c, e, '<', msg);
@ -1870,44 +1870,50 @@ rt_next_hop_update_rte(rtable *tab, net *n, rte *old)
static inline int static inline int
rt_next_hop_update_net(rtable *tab, net *n) rt_next_hop_update_net(rtable *tab, net *n)
{ {
struct rte_storage **k, *e, *new, *old_best, **new_best; struct rte_storage *new;
int count = 0; int count = 0;
int free_old_best = 0;
old_best = n->routes; struct rte_storage *old_best = n->routes;
if (!old_best) if (!old_best)
return 0; return 0;
for (k = &n->routes; e = *k; k = &e->next) for (struct rte_storage *e, **k = &n->routes; e = *k; k = &e->next)
if (rta_next_hop_outdated(e->rte.attrs)) if (rta_next_hop_outdated(e->rte.attrs))
{ count++;
new = rt_next_hop_update_rte(tab, n, &e->rte);
new->next = e->next;
*k = new;
rte_trace_in(D_ROUTES, new->rte.sender, &new->rte, "updated");
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->rte.src->proto->rte_recalculate)
e->rte.src->proto->rte_recalculate(tab, n, &new->rte, &e->rte, NULL);
if (e != old_best)
rte_free(e, tab);
else /* Freeing of the old best rte is postponed */
free_old_best = 1;
e = new;
count++;
}
if (!count) if (!count)
return 0; return 0;
struct rte_multiupdate {
struct rte_storage *old, *new;
} *updates = alloca(sizeof(struct rte_multiupdate) * count);
int pos = 0;
for (struct rte_storage *e, **k = &n->routes; e = *k; k = &e->next)
if (rta_next_hop_outdated(e->rte.attrs))
{
struct rte_storage *new = rt_next_hop_update_rte(tab, n, &e->rte);
/* Call a pre-comparison hook */
/* Not really an efficient way to compute this */
if (e->rte.src->proto->rte_recalculate)
e->rte.src->proto->rte_recalculate(tab, n, &new->rte, &e->rte, &old_best->rte);
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 */ /* Find the new best route */
new_best = NULL; struct rte_storage **new_best = NULL;
for (k = &n->routes; e = *k; k = &e->next) for (struct rte_storage *e, **k = &n->routes; e = *k; k = &e->next)
{ {
if (!new_best || rte_better(&e->rte, &(*new_best)->rte)) if (!new_best || rte_better(&e->rte, &(*new_best)->rte))
new_best = k; new_best = k;
@ -1922,15 +1928,17 @@ rt_next_hop_update_net(rtable *tab, net *n)
n->routes = new; n->routes = new;
} }
/* Announce the new best route */ /* Announce the changes */
if (new != old_best) for (int i=0; i<count; i++)
rte_trace_in(D_ROUTES, new->rte.sender, &new->rte, "updated [best]"); {
_Bool nb = (new == updates[i].new), ob = (old_best == updates[i].old);
const char *best_indicator[2][2] = { { "updated", "updated [-best]" }, { "updated [+best]", "updated [best]" } };
rte_trace_in(D_ROUTES, new->rte.sender, &updates[i].new->rte, best_indicator[nb][ob]);
rte_announce_i(tab, RA_UNDEF, n, updates[i].new, updates[i].old, new, old_best);
}
/* Propagate changes */ for (int i=0; i<count; i++)
rte_announce_i(tab, RA_UNDEF, n, NULL, NULL, n->routes, old_best); rte_free(updates[i].old, tab);
if (free_old_best)
rte_free(old_best, tab);
return count; return count;
} }