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MPLS: Handle label allocation failures

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This commit is contained in:
Ondrej Zajicek 2023-09-26 18:50:20 +02:00
parent e915f99e1c
commit 9b775859cd
3 changed files with 64 additions and 19 deletions
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72
nest/mpls.c
View File

@ -78,7 +78,6 @@
* TODO:
* - protocols should do route refresh instead of restart when reconfiguration
* requires changing labels (e.g. different label range)
* - handle label allocation failures
* - special handling of reserved labels
*/
@ -720,17 +719,21 @@ struct mpls_fec *
mpls_get_fec_by_label(struct mpls_fec_map *m, u32 label)
{
struct mpls_fec *fec = HASH_FIND(m->label_hash, LABEL, label);
/* FIXME: check if (fec->policy == MPLS_POLICY_STATIC) */
if (fec)
return fec;
fec = sl_allocz(mpls_slab(m, 0));
if (!m->static_handle)
m->static_handle = mpls_new_handle(m->domain, m->domain->cf->static_range->range);
fec->label = mpls_new_label(m->domain, m->static_handle, label);
if (fec)
return (fec->policy == MPLS_POLICY_STATIC) ? fec : NULL;
label = mpls_new_label(m->domain, m->static_handle, label);
if (!label)
return NULL;
fec = sl_allocz(mpls_slab(m, 0));
fec->label = label;
fec->policy = MPLS_POLICY_STATIC;
DBG("New FEC lab %u\n", fec->label);
@ -752,13 +755,18 @@ mpls_get_fec_by_net(struct mpls_fec_map *m, const net_addr *net, u32 path_id)
if (fec)
return fec;
u32 label = mpls_new_label(m->domain, m->handle, 0);
if (!label)
return NULL;
fec = sl_allocz(mpls_slab(m, net->type));
fec->hash = hash;
fec->path_id = path_id;
net_copy(fec->net, net);
fec->label = mpls_new_label(m->domain, m->handle, 0);
fec->label = label;
fec->policy = MPLS_POLICY_PREFIX;
DBG("New FEC net %u\n", fec->label);
@ -785,13 +793,21 @@ mpls_get_fec_by_rta(struct mpls_fec_map *m, const rta *src, u32 class_id)
return fec;
}
u32 label = mpls_new_label(m->domain, m->handle, 0);
if (!label)
{
rta_free(rta);
return NULL;
}
fec = sl_allocz(mpls_slab(m, 0));
fec->hash = hash;
fec->class_id = class_id;
fec->rta = rta;
fec->label = mpls_new_label(m->domain, m->handle, 0);
fec->label = label;
fec->policy = MPLS_POLICY_AGGREGATE;
DBG("New FEC rta %u\n", fec->label);
@ -810,9 +826,14 @@ mpls_get_fec_for_vrf(struct mpls_fec_map *m)
if (fec)
return fec;
u32 label = mpls_new_label(m->domain, m->handle, 0);
if (!label)
return NULL;
fec = sl_allocz(mpls_slab(m, 0));
fec->label = mpls_new_label(m->domain, m->handle, 0);
fec->label = label;
fec->policy = MPLS_POLICY_VRF;
fec->iface = m->vrf_iface;
@ -872,7 +893,7 @@ static inline void mpls_unlock_fec(struct mpls_fec_map *x, struct mpls_fec *fec)
static inline void
mpls_damage_fec(struct mpls_fec_map *m UNUSED, struct mpls_fec *fec)
{
if (fec->state == MPLS_FEC_CLEAN)
if (fec && (fec->state == MPLS_FEC_CLEAN))
fec->state = MPLS_FEC_DIRTY;
}
@ -992,7 +1013,7 @@ mpls_apply_fec(rte *r, struct mpls_fec *fec, linpool *lp)
}
void
int
mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp, struct mpls_fec **locked_fec)
{
ASSERT(!(r->flags & REF_COW));
@ -1004,15 +1025,22 @@ mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp,
switch (policy)
{
case MPLS_POLICY_NONE:
return;
return 0;
case MPLS_POLICY_STATIC:;
uint label = ea_get_int(r->attrs->eattrs, EA_MPLS_LABEL, 0);
if (label < 16)
return;
return 0;
fec = mpls_get_fec_by_label(m, label);
if (!fec)
{
log(L_WARN "Static label %u failed for %N from %s",
label, n, r->sender->proto->name);
return -1;
}
mpls_damage_fec(m, fec);
break;
@ -1028,14 +1056,22 @@ mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp,
case MPLS_POLICY_VRF:
if (!m->vrf_iface)
return;
return 0;
fec = mpls_get_fec_for_vrf(m);
break;
default:
log(L_WARN "Route %N has invalid MPLS policy %u", n, policy);
return;
return -1;
}
/* Label allocation failure */
if (!fec)
{
log(L_WARN "Label allocation in range %s failed for %N from %s",
m->handle->range->name, n, r->sender->proto->name);
return -1;
}
/* Temporarily lock FEC */
@ -1048,6 +1084,8 @@ mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp,
/* Announce MPLS rule for new/updated FEC */
if (fec->state != MPLS_FEC_CLEAN)
mpls_announce_fec(m, fec, r->attrs);
return 0;
}
void

2
nest/mpls.h
View File

@ -168,7 +168,7 @@ struct mpls_fec *mpls_get_fec_by_label(struct mpls_fec_map *m, u32 label);
struct mpls_fec *mpls_get_fec_by_net(struct mpls_fec_map *m, const net_addr *net, u32 path_id);
struct mpls_fec *mpls_get_fec_by_rta(struct mpls_fec_map *m, const rta *src, u32 class_id);
void mpls_free_fec(struct mpls_fec_map *x, struct mpls_fec *fec);
void mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp, struct mpls_fec **locked_fec);
int mpls_handle_rte(struct mpls_fec_map *m, const net_addr *n, rte *r, linpool *lp, struct mpls_fec **locked_fec);
void mpls_handle_rte_cleanup(struct mpls_fec_map *m, struct mpls_fec **locked_fec);
void mpls_rte_insert(net *n UNUSED, rte *r);
void mpls_rte_remove(net *n UNUSED, rte *r);

9
nest/rt-table.c
View File

@ -1614,7 +1614,14 @@ rte_update2(struct channel *c, const net_addr *n, rte *new, struct rte_src *src)
}
if (p->mpls_map)
mpls_handle_rte(p->mpls_map, n, new, rte_update_pool, &fec);
{
if (mpls_handle_rte(p->mpls_map, n, new, rte_update_pool, &fec) < 0)
{
rte_trace_in(D_FILTERS, c, new, "invalid");
stats->imp_updates_invalid++;
goto drop;
}
}
if (!rta_is_cached(new->attrs)) /* Need to copy attributes */
new->attrs = rta_lookup(new->attrs);