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https://gitlab.nic.cz/labs/bird.git
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MPLS: Implement FEC map reconfiguration
This allows changing label policy or label range without restart.
This commit is contained in:
Ondrej Zajicek
parent
9b775859cd
commit
a7a9df8639
167
nest/mpls.c
167
nest/mpls.c
@ -76,8 +76,6 @@
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* and withdrawal of MPLS routes.
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*
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* TODO:
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* - protocols should do route refresh instead of restart when reconfiguration
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* requires changing labels (e.g. different label range)
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* - special handling of reserved labels
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*/
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@ -254,7 +252,8 @@ mpls_reconfigure_domain(struct mpls_domain *m, struct mpls_domain_config *cf)
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struct mpls_range *r, *r2;
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WALK_LIST_DELSAFE(r, r2, old_ranges)
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mpls_remove_range(r);
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if (!r->removed)
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mpls_remove_range(r);
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add_tail_list(&m->ranges, &old_ranges);
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@ -384,7 +383,7 @@ mpls_find_range_(list *l, const char *name)
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struct mpls_range *r;
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WALK_LIST(r, *l)
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if (!strcmp(r->name, name))
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if (!strcmp(r->name, name) && !r->removed)
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return r;
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return NULL;
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@ -415,7 +414,6 @@ mpls_free_range(struct mpls_range *r)
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ASSERT(r->use_count == 0);
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ASSERT(r->label_count == 0);
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r->cf->range = NULL;
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rem_node(&r->n);
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mb_free(r);
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}
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@ -423,7 +421,11 @@ mpls_free_range(struct mpls_range *r)
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static void
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mpls_remove_range(struct mpls_range *r)
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{
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ASSERT(!r->removed);
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r->removed = 1;
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r->cf->range = NULL;
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r->cf = NULL;
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if (!r->use_count)
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mpls_free_range(r);
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@ -515,6 +517,26 @@ mpls_free_label(struct mpls_domain *m, struct mpls_handle *h, uint n)
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h->label_count--;
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}
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void
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mpls_move_label(struct mpls_domain *m, struct mpls_handle *fh, struct mpls_handle *th, uint n)
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{
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struct mpls_range *fr = fh->range;
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struct mpls_range *tr = th->range;
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ASSERT(lmap_test(&m->labels, n));
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ASSERT((n >= fr->lo) && (n < fr->hi));
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ASSERT((n >= tr->lo) && (n < tr->hi));
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ASSERT(fr->label_count);
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fr->label_count--;
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ASSERT(fh->label_count);
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fh->label_count--;
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tr->label_count++;
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th->label_count++;
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}
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/*
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* MPLS channel
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@ -561,16 +583,32 @@ mpls_channel_cleanup(struct channel *C)
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}
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static int
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mpls_channel_reconfigure(struct channel *C, struct channel_config *CC, int *import_changed UNUSED, int *export_changed UNUSED)
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mpls_channel_reconfigure(struct channel *C, struct channel_config *CC, int *import_changed, int *export_changed UNUSED)
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{
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struct mpls_channel *c = (void *) C;
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struct mpls_channel_config *new = (void *) CC;
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if ((new->domain->domain != c->domain) ||
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(new->range->range != c->range) ||
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(new->label_policy != c->label_policy))
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if (new->domain->domain != c->domain)
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return 0;
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if (new->range->range != c->range)
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{
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if (c->c.channel_state != CS_DOWN)
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mpls_unlock_range(c->range);
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c->range = new->range->range;
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*import_changed = 1;
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if (c->c.channel_state != CS_DOWN)
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mpls_lock_range(c->range);
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}
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if (new->label_policy != c->label_policy)
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{
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c->label_policy = new->label_policy;
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*import_changed = 1;
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}
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return 1;
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}
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@ -639,6 +677,7 @@ HASH_DEFINE_REHASH_FN(RTA, struct mpls_fec)
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HASH_DEFINE_REHASH_FN(LABEL, struct mpls_fec)
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static void mpls_unlink_fec(struct mpls_fec_map *m, struct mpls_fec *fec);
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static void mpls_withdraw_fec(struct mpls_fec_map *m, struct mpls_fec *fec);
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static rta * mpls_get_key_rta(struct mpls_fec_map *m, const rta *src);
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@ -666,6 +705,67 @@ mpls_fec_map_new(pool *pp, struct channel *C, uint rts)
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return m;
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}
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void
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mpls_fec_map_reconfigure(struct mpls_fec_map *m, struct channel *C)
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{
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struct mpls_channel *c = (void *) C;
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struct mpls_handle *old_d = NULL;
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struct mpls_handle *old_s = NULL;
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/* Reallocate dynamic handle */
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if (m->handle->range != c->range)
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{
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old_d = m->handle;
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m->handle = mpls_new_handle(m->domain, c->range);
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}
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/* Reallocate static handle */
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if (m->static_handle && (m->static_handle->range != m->domain->cf->static_range->range))
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{
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old_s = m->static_handle;
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m->static_handle = mpls_new_handle(m->domain, m->domain->cf->static_range->range);
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}
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/* Skip rest if there is no change */
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if (!old_d && !old_s)
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return;
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/* Process existing FECs */
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HASH_WALK(m->label_hash, next_l, fec)
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{
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/* Skip already dead FECs */
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if (fec->policy == MPLS_POLICY_NONE)
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continue;
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/* Skip FECs with valid handle */
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if ((fec->handle == m->handle) || (fec->handle == m->static_handle))
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continue;
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/* Try new handle for the FEC */
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struct mpls_handle *new = (fec->policy != MPLS_POLICY_STATIC) ? m->handle : m->static_handle;
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if ((fec->label >= new->range->lo) && (fec->label < new->range->hi))
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{
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mpls_move_label(m->domain, fec->handle, new, fec->label);
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fec->handle = new;
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continue;
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}
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/* Unlink the FEC while keep it in the label hash */
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mpls_unlink_fec(m, fec);
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fec->policy = MPLS_POLICY_NONE;
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}
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HASH_WALK_END;
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/* Remove old unused handles */
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if (old_d && !old_d->label_count)
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mpls_free_handle(m->domain, old_d);
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if (old_s && !old_s->label_count)
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mpls_free_handle(m->domain, old_s);
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}
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void
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mpls_fec_map_free(struct mpls_fec_map *m)
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{
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@ -683,8 +783,10 @@ mpls_fec_map_free(struct mpls_fec_map *m)
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/* Free allocated labels */
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HASH_WALK(m->label_hash, next_l, fec)
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{
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struct mpls_handle *h = (fec->policy != MPLS_POLICY_STATIC) ? m->handle : m->static_handle;
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mpls_free_label(m->domain, h, fec->label);
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mpls_free_label(m->domain, fec->handle, fec->label);
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if (!fec->policy && !fec->handle->label_count)
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mpls_free_handle(m->domain, fec->handle);
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}
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HASH_WALK_END;
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@ -720,12 +822,12 @@ mpls_get_fec_by_label(struct mpls_fec_map *m, u32 label)
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{
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struct mpls_fec *fec = HASH_FIND(m->label_hash, LABEL, label);
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if (!m->static_handle)
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m->static_handle = mpls_new_handle(m->domain, m->domain->cf->static_range->range);
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if (fec)
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return (fec->policy == MPLS_POLICY_STATIC) ? fec : NULL;
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if (!m->static_handle)
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m->static_handle = mpls_new_handle(m->domain, m->domain->cf->static_range->range);
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label = mpls_new_label(m->domain, m->static_handle, label);
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if (!label)
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@ -735,6 +837,7 @@ mpls_get_fec_by_label(struct mpls_fec_map *m, u32 label)
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fec->label = label;
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fec->policy = MPLS_POLICY_STATIC;
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fec->handle = m->static_handle;
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DBG("New FEC lab %u\n", fec->label);
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@ -768,6 +871,7 @@ mpls_get_fec_by_net(struct mpls_fec_map *m, const net_addr *net, u32 path_id)
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fec->label = label;
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fec->policy = MPLS_POLICY_PREFIX;
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fec->handle = m->handle;
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DBG("New FEC net %u\n", fec->label);
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@ -809,6 +913,7 @@ mpls_get_fec_by_rta(struct mpls_fec_map *m, const rta *src, u32 class_id)
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fec->label = label;
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fec->policy = MPLS_POLICY_AGGREGATE;
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fec->handle = m->handle;
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DBG("New FEC rta %u\n", fec->label);
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@ -835,6 +940,7 @@ mpls_get_fec_for_vrf(struct mpls_fec_map *m)
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fec->label = label;
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fec->policy = MPLS_POLICY_VRF;
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fec->handle = m->handle;
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fec->iface = m->vrf_iface;
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DBG("New FEC vrf %u\n", fec->label);
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@ -845,21 +951,12 @@ mpls_get_fec_for_vrf(struct mpls_fec_map *m)
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return fec;
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}
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void
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mpls_free_fec(struct mpls_fec_map *m, struct mpls_fec *fec)
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static void
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mpls_unlink_fec(struct mpls_fec_map *m, struct mpls_fec *fec)
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{
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if (fec->state != MPLS_FEC_DOWN)
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mpls_withdraw_fec(m, fec);
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DBG("Free FEC %u\n", fec->label);
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struct mpls_handle *h = (fec->policy != MPLS_POLICY_STATIC) ? m->handle : m->static_handle;
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mpls_free_label(m->domain, h, fec->label);
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HASH_REMOVE2(m->label_hash, LABEL, m->pool, fec);
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switch (fec->policy)
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{
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case MPLS_POLICY_NONE:
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case MPLS_POLICY_STATIC:
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break;
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@ -880,6 +977,24 @@ mpls_free_fec(struct mpls_fec_map *m, struct mpls_fec *fec)
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default:
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bug("Unknown fec type");
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}
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}
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void
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mpls_free_fec(struct mpls_fec_map *m, struct mpls_fec *fec)
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{
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if (fec->state != MPLS_FEC_DOWN)
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mpls_withdraw_fec(m, fec);
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DBG("Free FEC %u\n", fec->label);
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mpls_free_label(m->domain, fec->handle, fec->label);
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if (!fec->policy && !fec->handle->label_count)
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mpls_free_handle(m->domain, fec->handle);
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HASH_REMOVE2(m->label_hash, LABEL, m->pool, fec);
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mpls_unlink_fec(m, fec);
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sl_free(fec);
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}
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@ -93,6 +93,7 @@ void mpls_preconfig(struct config *c);
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void mpls_commit(struct config *new, struct config *old);
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uint mpls_new_label(struct mpls_domain *m, struct mpls_handle *h, uint n);
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void mpls_free_label(struct mpls_domain *m, struct mpls_handle *h, uint n);
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void mpls_move_label(struct mpls_domain *m, struct mpls_handle *fh, struct mpls_handle *th, uint n);
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static inline struct mpls_domain_config *cf_default_mpls_domain(struct config *cfg)
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{ return EMPTY_LIST(cfg->mpls_domains) ? NULL : HEAD(cfg->mpls_domains); }
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@ -133,6 +134,8 @@ struct mpls_fec {
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u8 state; /* FEC state (MPLS_FEC_*) */
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u8 policy; /* Label policy (MPLS_POLICY_*) */
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struct mpls_handle *handle; /* Handle holding the label */
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struct mpls_fec *next_k; /* Next in mpls_fec.net_hash/rta_hash */
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struct mpls_fec *next_l; /* Next in mpls_fec.label_hash */
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union { /* Primary key */
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@ -152,7 +155,7 @@ struct mpls_fec_map {
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struct channel *channel; /* MPLS channel for FEC announcement */
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struct mpls_domain *domain; /* MPLS domain, keeping reference */
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struct mpls_handle *handle; /* Handle for allocation of labels */
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struct mpls_handle *handle; /* Handle for dynamic allocation of labels */
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struct mpls_handle *static_handle; /* Handle for static label allocations, optional */
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struct iface *vrf_iface;
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@ -162,6 +165,7 @@ struct mpls_fec_map {
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struct mpls_fec_map *mpls_fec_map_new(pool *p, struct channel *c, uint rts);
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void mpls_fec_map_reconfigure(struct mpls_fec_map *m, struct channel *C);
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void mpls_fec_map_free(struct mpls_fec_map *m);
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struct mpls_fec *mpls_find_fec_by_label(struct mpls_fec_map *x, u32 label);
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struct mpls_fec *mpls_get_fec_by_label(struct mpls_fec_map *m, u32 label);
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@ -997,7 +997,7 @@ proto_setup_mpls_map(struct proto *p, uint rts, int hooks)
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}
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else if (m && c)
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{
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// mpls_fec_map_reconfigure(m, c);
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mpls_fec_map_reconfigure(m, c);
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}
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if (hooks)
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