ospf6d: assorted code cleanup

This commits consists of several changes that positively impact
code reability without introducing any logical change.

Summary of the changes:
* Return earlier in ospf6_abr_range_update() in order to reduce one
  level of indentation;
* Remove ospf6_translated_nssa_originate() since it's nothing other
  than a useless wrapper around ospf6_lsa_translated_nssa_new();
* Change ospf6_abr_translate_nssa() to return void;
* Change ospf6_abr_process_nssa_translates() checking for NSSA areas
  before anything else;
* Remove ospf6_abr_remove_unapproved_translates_apply() since it's a
  small function that is only called in one place;
* Change ospf6_abr_check_translate_nssa() to avoid an LSDB lookup when
  the router isn't an ABR.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

3 files changed, 43 insertions, 81 deletions

diff --git a/ospf6d/ospf6_abr.c b/ospf6d/ospf6_abr.c
index 0b2c14bc54..690a0dd254 100644
--- a/ospf6d/ospf6_abr.c
+++ b/ospf6d/ospf6_abr.c
@@ -681,34 +681,31 @@ void ospf6_abr_range_update(struct ospf6_route *range, struct ospf6 *ospf6)
 	 * if there
 	 * were active ranges.
 	 */
+	if (!ospf6_abr_range_summary_needs_update(range, cost))
+		return;
 
-	if (ospf6_abr_range_summary_needs_update(range, cost)) {
-		if (IS_OSPF6_DEBUG_ABR)
-			zlog_debug("%s: range %pFX update", __func__,
-				   &range->prefix);
-		for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa))
-			summary_orig +=
-				ospf6_abr_originate_summary_to_area(range, oa);
-
-		if (CHECK_FLAG(range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY)
-		    && summary_orig) {
-			if (!CHECK_FLAG(range->flag,
-					OSPF6_ROUTE_BLACKHOLE_ADDED)) {
-				if (IS_OSPF6_DEBUG_ABR)
-					zlog_debug("Add discard route");
+	if (IS_OSPF6_DEBUG_ABR)
+		zlog_debug("%s: range %pFX update", __func__, &range->prefix);
 
-				ospf6_zebra_add_discard(range, ospf6);
-			}
-		} else {
-			/* Summary removed or no summary generated as no
-			 * specifics exist */
-			if (CHECK_FLAG(range->flag,
-				       OSPF6_ROUTE_BLACKHOLE_ADDED)) {
-				if (IS_OSPF6_DEBUG_ABR)
-					zlog_debug("Delete discard route");
+	for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa))
+		summary_orig += ospf6_abr_originate_summary_to_area(range, oa);
 
-				ospf6_zebra_delete_discard(range, ospf6);
-			}
+	if (CHECK_FLAG(range->flag, OSPF6_ROUTE_ACTIVE_SUMMARY)
+	    && summary_orig) {
+		if (!CHECK_FLAG(range->flag, OSPF6_ROUTE_BLACKHOLE_ADDED)) {
+			if (IS_OSPF6_DEBUG_ABR)
+				zlog_debug("Add discard route");
+
+			ospf6_zebra_add_discard(range, ospf6);
+		}
+	} else {
+		/* Summary removed or no summary generated as no
+		 * specifics exist */
+		if (CHECK_FLAG(range->flag, OSPF6_ROUTE_BLACKHOLE_ADDED)) {
+			if (IS_OSPF6_DEBUG_ABR)
+				zlog_debug("Delete discard route");
+
+			ospf6_zebra_delete_discard(range, ospf6);
 		}
 	}
 }
diff --git a/ospf6d/ospf6_nssa.c b/ospf6d/ospf6_nssa.c
index c02e7fcbc0..7ab14fe4ad 100644
--- a/ospf6d/ospf6_nssa.c
+++ b/ospf6d/ospf6_nssa.c
@@ -596,27 +596,7 @@ struct ospf6_lsa *ospf6_translated_nssa_refresh(struct ospf6_area *area,
 	return new;
 }
 
-/* Originate Translated Type-5 for supplied Type-7 NSSA LSA */
-struct ospf6_lsa *ospf6_translated_nssa_originate(struct ospf6_area *oa,
-						  struct ospf6_lsa *type7)
-{
-	struct ospf6_lsa *new;
-
-	if (ntohs(type7->header->type) != OSPF6_LSTYPE_TYPE_7)
-		return NULL;
-
-	if ((new = ospf6_lsa_translated_nssa_new(oa, type7)) == NULL) {
-		if (IS_OSPF6_DEBUG_NSSA)
-			zlog_debug(
-				"%s : Could not translate Type-7, Id %pI4, to Type-5",
-				__func__, &type7->header->id);
-		return NULL;
-	}
-
-	return new;
-}
-
-int ospf6_abr_translate_nssa(struct ospf6_area *area, struct ospf6_lsa *lsa)
+static void ospf6_abr_translate_nssa(struct ospf6_area *area, struct ospf6_lsa *lsa)
 {
 	/* Incoming Type-7 or later aggregated Type-7
 	 *
@@ -645,7 +625,7 @@ int ospf6_abr_translate_nssa(struct ospf6_area *area, struct ospf6_lsa *lsa)
 			zlog_debug(
 				"%s : LSA Id %pI4, P-bit off, NO Translation",
 				__func__, &lsa->header->id);
-		return 1;
+		return;
 	}
 
 	if (IS_OSPF6_DEBUG_NSSA)
@@ -662,7 +642,7 @@ int ospf6_abr_translate_nssa(struct ospf6_area *area, struct ospf6_lsa *lsa)
 			zlog_debug(
 				"%s : LSA Id %pI4, Forward address is 0, NO Translation",
 				__func__, &lsa->header->id);
-		return 1;
+		return;
 	}
 
 	/* Find the existing AS-External LSA for this prefix */
@@ -705,16 +685,14 @@ int ospf6_abr_translate_nssa(struct ospf6_area *area, struct ospf6_lsa *lsa)
 		 * originate translated LSA
 		 */
 
-		if (ospf6_translated_nssa_originate(area, lsa) == NULL) {
+		if (ospf6_lsa_translated_nssa_new(area, lsa) == NULL) {
 			if (IS_OSPF6_DEBUG_NSSA)
 				zlog_debug(
 					"%s : Could not translate Type-7 for %pI4 to Type-5",
 					__func__, &lsa->header->id);
-			return 1;
+			return;
 		}
 	}
-
-	return 0;
 }
 
 static void ospf6_abr_process_nssa_translates(struct ospf6 *ospf6)
@@ -734,6 +712,8 @@ static void ospf6_abr_process_nssa_translates(struct ospf6 *ospf6)
 		zlog_debug("%s : Start", __func__);
 
 	for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, oa)) {
+		if (!IS_AREA_NSSA(oa))
+			continue;
 
 		/* skip if not translator */
 		if (oa->NSSATranslatorState == OSPF6_NSSA_TRANSLATE_DISABLED) {
@@ -743,13 +723,6 @@ static void ospf6_abr_process_nssa_translates(struct ospf6 *ospf6)
 			continue;
 		}
 
-		/* skip if not Nssa Area */
-		if (!IS_AREA_NSSA(oa)) {
-			zlog_debug("%s area %pI4 Flag %x", __func__,
-				   &oa->area_id, oa->flag);
-			continue;
-		}
-
 		if (IS_OSPF6_DEBUG_NSSA)
 			zlog_debug("%s : looking at area %pI4", __func__,
 				   &oa->area_id);
@@ -767,20 +740,6 @@ static void ospf6_abr_process_nssa_translates(struct ospf6 *ospf6)
 		zlog_debug("%s : Stop", __func__);
 }
 
-/*Flood max age LSA's for the unapproved LSA's */
-static int ospf6_abr_remove_unapproved_translates_apply(struct ospf6_lsa *lsa)
-{
-	if (CHECK_FLAG(lsa->flag, OSPF6_LSA_LOCAL_XLT)
-	    && CHECK_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED)) {
-		zlog_debug("%s : removing unapproved translates, lsa : %s",
-			   __func__, lsa->name);
-
-		/* FLUSH THROUGHOUT AS */
-		ospf6_lsa_premature_aging(lsa);
-	}
-	return 0;
-}
-
 static void ospf6_abr_remove_unapproved_translates(struct ospf6 *ospf6)
 {
 	struct ospf6_lsa *lsa;
@@ -792,8 +751,16 @@ static void ospf6_abr_remove_unapproved_translates(struct ospf6 *ospf6)
 		zlog_debug("ospf6_abr_remove_unapproved_translates(): Start");
 
 	type = htons(OSPF6_LSTYPE_AS_EXTERNAL);
-	for (ALL_LSDB_TYPED(ospf6->lsdb, type, lsa))
-		ospf6_abr_remove_unapproved_translates_apply(lsa);
+	for (ALL_LSDB_TYPED(ospf6->lsdb, type, lsa)) {
+		if (CHECK_FLAG(lsa->flag, OSPF6_LSA_LOCAL_XLT)
+		    && CHECK_FLAG(lsa->flag, OSPF6_LSA_UNAPPROVED)) {
+			zlog_debug(
+				"%s : removing unapproved translates, lsa : %s",
+				__func__, lsa->name);
+
+			ospf6_lsa_premature_aging(lsa);
+		}
+	}
 
 	if (IS_OSPF6_DEBUG_NSSA)
 		zlog_debug("ospf_abr_remove_unapproved_translates(): Stop");
@@ -1268,11 +1235,13 @@ void ospf6_abr_check_translate_nssa(struct ospf6_area *area,
 	if (IS_OSPF6_DEBUG_NSSA)
 		zlog_debug("%s : start", __func__);
 
+	if (!ospf6_check_and_set_router_abr(ospf6))
+		return;
+
 	type5 = ospf6_lsdb_lookup(htons(OSPF6_LSTYPE_AS_EXTERNAL),
 				  lsa->external_lsa_id, ospf6->router_id,
 				  ospf6->lsdb);
-
-	if (ospf6_check_and_set_router_abr(ospf6) && (type5 == NULL)) {
+	if (!type5) {
 		if (IS_OSPF6_DEBUG_NSSA)
 			zlog_debug("%s : Originating type5 LSA", __func__);
 		ospf6_lsa_translated_nssa_new(area, lsa);
diff --git a/ospf6d/ospf6_nssa.h b/ospf6d/ospf6_nssa.h
index 99cb04c003..02234cc8bd 100644
--- a/ospf6d/ospf6_nssa.h
+++ b/ospf6d/ospf6_nssa.h
@@ -55,8 +55,6 @@ extern void ospf6_nssa_lsa_flush(struct ospf6 *ospf6, struct prefix_ipv6 *p);
 extern struct ospf6_lsa *ospf6_translated_nssa_refresh(struct ospf6_area *oa,
 						       struct ospf6_lsa *type7,
 						       struct ospf6_lsa *type5);
-extern struct ospf6_lsa *
-ospf6_translated_nssa_originate(struct ospf6_area *oa, struct ospf6_lsa *type7);
 
 extern void ospf6_asbr_nssa_redist_task(struct ospf6 *ospf6);
 
@@ -69,8 +67,6 @@ extern void install_element_ospf6_debug_nssa(void);
 extern void ospf6_abr_nssa_type_7_defaults(struct ospf6 *osof6);
 int ospf6_redistribute_check(struct ospf6 *ospf6, struct ospf6_route *route,
 			     int type);
-extern int ospf6_abr_translate_nssa(struct ospf6_area *area,
-				    struct ospf6_lsa *lsa);
 extern void ospf6_abr_check_translate_nssa(struct ospf6_area *area,
 					   struct ospf6_lsa *lsa);
 extern void ospf6_abr_nssa_check_status(struct ospf6 *ospf6);