ospf6d: factor out generic TLV handling

In preperation for Extended LSA types and their TLVs, factor out the TLV
handling from the Gracefull Restart functionality.

Signed-off-by: Andrew Cooks <acooks.at.bda@gmail.com>

ospf6d/ospf6_asbr.c

@@ -39,6 +39,7 @@
 #include "ospf6d.h"
 #include "ospf6_spf.h"
 #include "ospf6_nssa.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 #include "lib/json.h"
 

ospf6d/ospf6_flood.c

@@ -26,6 +26,7 @@
 
 #include "ospf6_flood.h"
 #include "ospf6_nssa.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 
 unsigned char conf_debug_ospf6_flooding;

ospf6d/ospf6_gr.c

@@ -30,6 +30,7 @@
 #include "ospf6d/ospf6_flood.h"
 #include "ospf6d/ospf6_intra.h"
 #include "ospf6d/ospf6_spf.h"
+#include "ospf6d/ospf6_tlv.h"
 #include "ospf6d/ospf6_gr.h"
 #include "ospf6d/ospf6_gr_clippy.c"
 
@@ -57,13 +58,13 @@ static int ospf6_gr_lsa_originate(struct ospf6_interface *oi,
 	grace_lsa = (struct ospf6_grace_lsa *)ospf6_lsa_header_end(lsa_header);
 
 	/* Put grace period. */
-	grace_lsa->tlv_period.header.type = htons(GRACE_PERIOD_TYPE);
+	grace_lsa->tlv_period.header.type = htons(TLV_GRACE_PERIOD_TYPE);
-	grace_lsa->tlv_period.header.length = htons(GRACE_PERIOD_LENGTH);
+	grace_lsa->tlv_period.header.length = htons(TLV_GRACE_PERIOD_LENGTH);
 	grace_lsa->tlv_period.interval = htonl(gr_info->grace_period);
 
 	/* Put restart reason. */
-	grace_lsa->tlv_reason.header.type = htons(RESTART_REASON_TYPE);
+	grace_lsa->tlv_reason.header.type = htons(TLV_GRACE_RESTART_REASON_TYPE);
-	grace_lsa->tlv_reason.header.length = htons(RESTART_REASON_LENGTH);
+	grace_lsa->tlv_reason.header.length = htons(TLV_GRACE_RESTART_REASON_LENGTH);
 	grace_lsa->tlv_reason.reason = reason;
 
 	/* Fill LSA Header */

ospf6d/ospf6_gr.h

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * OSPF6 Graceful Retsart helper functions.
+ * OSPF6 Graceful Restart helper functions.
+ * Ref RFC 5187
  *
  * Copyright (C) 2021-22 Vmware, Inc.
  * Rajesh Kumar Girada
@@ -60,58 +61,16 @@ enum ospf6_gr_helper_rejected_reason {
 	OSPF6_HELPER_RESTARTING,
 };
 
-#ifdef roundup
-#define ROUNDUP(val, gran) roundup(val, gran)
-#else /* roundup */
-#define ROUNDUP(val, gran) (((val)-1 | (gran)-1) + 1)
-#endif /* roundup */
 
-/*
+#define GRACE_PERIOD_TLV_SIZE sizeof(struct tlv_grace_period)
- * Generic TLV (type, length, value) macros
+#define GRACE_RESTART_REASON_TLV_SIZE sizeof(struct tlv_grace_restart_reason)
- */
-struct tlv_header {
-	uint16_t type;   /* Type of Value */
-	uint16_t length; /* Length of Value portion only, in bytes */
-};
-
-#define TLV_HDR_SIZE (sizeof(struct tlv_header))
-
-#define TLV_BODY_SIZE(tlvh) (ROUNDUP(ntohs((tlvh)->length), sizeof(uint32_t)))
-
-#define TLV_SIZE(tlvh) (uint32_t)(TLV_HDR_SIZE + TLV_BODY_SIZE(tlvh))
-
-#define TLV_HDR_TOP(lsah)                                                      \
-	(struct tlv_header *)((char *)(lsah) + OSPF6_LSA_HEADER_SIZE)
-
-#define TLV_HDR_NEXT(tlvh)                                                     \
-	(struct tlv_header *)((char *)(tlvh) + TLV_SIZE(tlvh))
-
-/* Ref RFC5187 appendix-A */
-/* Grace period TLV */
-#define GRACE_PERIOD_TYPE 1
-#define GRACE_PERIOD_LENGTH 4
-struct grace_tlv_graceperiod {
-	struct tlv_header header;
-	uint32_t interval;
-};
-#define GRACE_PERIOD_TLV_SIZE sizeof(struct grace_tlv_graceperiod)
-
-/* Restart reason TLV */
-#define RESTART_REASON_TYPE 2
-#define RESTART_REASON_LENGTH 1
-struct grace_tlv_restart_reason {
-	struct tlv_header header;
-	uint8_t reason;
-	uint8_t reserved[3];
-};
-#define GRACE_RESTART_REASON_TLV_SIZE sizeof(struct grace_tlv_restart_reason)
 
 #define OSPF6_GRACE_LSA_MIN_SIZE                                               \
 	GRACE_PERIOD_TLV_SIZE + GRACE_RESTART_REASON_TLV_SIZE
 
 struct ospf6_grace_lsa {
-	struct grace_tlv_graceperiod tlv_period;
+	struct tlv_grace_period tlv_period;
-	struct grace_tlv_restart_reason tlv_reason;
+	struct tlv_grace_restart_reason tlv_reason;
 };
 
 struct advRtr {

ospf6d/ospf6_gr_helper.c

@@ -32,6 +32,7 @@
 #include "ospf6_neighbor.h"
 #include "ospf6_intra.h"
 #include "ospf6d.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 #include "lib/json.h"
 #include "ospf6d/ospf6_gr_helper_clippy.c"
@@ -129,8 +130,8 @@ static int ospf6_extract_grace_lsa_fields(struct ospf6_lsa *lsa,
 {
 	struct ospf6_lsa_header *lsah = NULL;
 	struct tlv_header *tlvh = NULL;
-	struct grace_tlv_graceperiod *gracePeriod;
+	struct tlv_grace_period *gracePeriod;
-	struct grace_tlv_restart_reason *grReason;
+	struct tlv_grace_restart_reason *grReason;
 	uint16_t length = 0;
 	int sum = 0;
 
@@ -157,8 +158,8 @@ static int ospf6_extract_grace_lsa_fields(struct ospf6_lsa *lsa,
 		}
 
 		switch (ntohs(tlvh->type)) {
-		case GRACE_PERIOD_TYPE:
+		case TLV_GRACE_PERIOD_TYPE:
-			gracePeriod = (struct grace_tlv_graceperiod *)tlvh;
+			gracePeriod = (struct tlv_grace_period *)tlvh;
 			*interval = ntohl(gracePeriod->interval);
 			sum += TLV_SIZE(tlvh);
 
@@ -167,8 +168,8 @@ static int ospf6_extract_grace_lsa_fields(struct ospf6_lsa *lsa,
 			    || *interval < OSPF6_MIN_GRACE_INTERVAL)
 				return OSPF6_FAILURE;
 			break;
-		case RESTART_REASON_TYPE:
+		case TLV_GRACE_RESTART_REASON_TYPE:
-			grReason = (struct grace_tlv_restart_reason *)tlvh;
+			grReason = (struct tlv_grace_restart_reason *)tlvh;
 			*reason = grReason->reason;
 			sum += TLV_SIZE(tlvh);
 
@@ -1218,8 +1219,8 @@ static int ospf6_grace_lsa_show_info(struct vty *vty, struct ospf6_lsa *lsa,
 {
 	struct ospf6_lsa_header *lsah = NULL;
 	struct tlv_header *tlvh = NULL;
-	struct grace_tlv_graceperiod *gracePeriod;
+	struct tlv_grace_period *gracePeriod;
-	struct grace_tlv_restart_reason *grReason;
+	struct tlv_grace_restart_reason *grReason;
 	uint16_t length = 0;
 	int sum = 0;
 
@@ -1255,8 +1256,8 @@ static int ospf6_grace_lsa_show_info(struct vty *vty, struct ospf6_lsa *lsa,
 		}
 
 		switch (ntohs(tlvh->type)) {
-		case GRACE_PERIOD_TYPE:
+		case TLV_GRACE_PERIOD_TYPE:
-			gracePeriod = (struct grace_tlv_graceperiod *)tlvh;
+			gracePeriod = (struct tlv_grace_period *)tlvh;
 			sum += TLV_SIZE(tlvh);
 
 			if (vty) {
@@ -1272,8 +1273,8 @@ static int ospf6_grace_lsa_show_info(struct vty *vty, struct ospf6_lsa *lsa,
 					   ntohl(gracePeriod->interval));
 			}
 			break;
-		case RESTART_REASON_TYPE:
+		case TLV_GRACE_RESTART_REASON_TYPE:
-			grReason = (struct grace_tlv_restart_reason *)tlvh;
+			grReason = (struct tlv_grace_restart_reason *)tlvh;
 			sum += TLV_SIZE(tlvh);
 			if (vty) {
 				if (use_json)

ospf6d/ospf6_interface.c

@@ -30,6 +30,7 @@
 #include "ospf6d.h"
 #include "ospf6_bfd.h"
 #include "ospf6_zebra.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 #include "lib/json.h"
 #include "ospf6_proto.h"

ospf6d/ospf6_intra.c

@@ -32,6 +32,7 @@
 #include "ospf6_flood.h"
 #include "ospf6d.h"
 #include "ospf6_spf.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 
 unsigned char conf_debug_ospf6_brouter = 0;

ospf6d/ospf6_message.c

@@ -33,6 +33,7 @@
 
 #include "ospf6_flood.h"
 #include "ospf6d.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 #include <netinet/ip6.h>
 #include "lib/libospf.h"

ospf6d/ospf6_neighbor.c

@@ -30,6 +30,7 @@
 #include "ospf6_lsa.h"
 #include "ospf6_spf.h"
 #include "ospf6_zebra.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 #include "lib/json.h"
 

ospf6d/ospf6_tlv.h

@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * OSPFv3 Type Length Value.
+ *
+ */
+
+#ifndef OSPF6_TLV_H
+#define OSPF6_TLV_H
+
+/*
+ * Generic TLV (type, length, value) macros
+ */
+struct tlv_header {
+	uint16_t type;	 /* Type of Value */
+	uint16_t length; /* Length of Value portion only, in bytes */
+};
+
+#ifdef roundup
+#define ROUNDUP(val, gran) roundup(val, gran)
+#else /* roundup */
+#define ROUNDUP(val, gran) (((val)-1 | (gran)-1) + 1)
+#endif /* roundup */
+
+#define TLV_HDR_SIZE (sizeof(struct tlv_header))
+
+#define TLV_BODY_SIZE(tlvh) (ROUNDUP(ntohs((tlvh)->length), sizeof(uint32_t)))
+
+#define TLV_SIZE(tlvh) ((uint32_t)(TLV_HDR_SIZE + TLV_BODY_SIZE(tlvh)))
+
+#define TLV_HDR_TOP(lsah)                                                      \
+	((struct tlv_header *)((char *)(lsah) + OSPF6_LSA_HEADER_SIZE))
+
+#define TLV_HDR_NEXT(tlvh)                                                     \
+	((struct tlv_header *)((char *)(tlvh) + TLV_SIZE(tlvh)))
+
+/*
+ * RFC 5187 - OSPFv3 Graceful Restart - Grace-LSA
+ * Graceful restart predates Extended-LSA TLVs and IANA TLV register.
+ */
+/* Grace period TLV. */
+#define TLV_GRACE_PERIOD_TYPE 1
+#define TLV_GRACE_PERIOD_LENGTH 4
+struct tlv_grace_period {
+	struct tlv_header header;
+	uint32_t interval;
+};
+
+/* Restart reason TLV. */
+#define TLV_GRACE_RESTART_REASON_TYPE 2
+#define TLV_GRACE_RESTART_REASON_LENGTH 1
+struct tlv_grace_restart_reason {
+	struct tlv_header header;
+	uint8_t reason;
+	uint8_t reserved[3];
+};
+
+
+#endif /* OSPF6_TLV_H */

ospf6d/ospf6_top.c

@@ -37,6 +37,7 @@
 #include "ospf6_intra.h"
 #include "ospf6_spf.h"
 #include "ospf6d.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 #include "lib/json.h"
 #include "ospf6_nssa.h"

ospf6d/ospf6_zebra.c

@@ -27,6 +27,7 @@
 #include "ospf6_zebra.h"
 #include "ospf6d.h"
 #include "ospf6_area.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 #include "lib/json.h"
 

ospf6d/ospf6d.c

@@ -30,6 +30,7 @@
 #include "ospf6_flood.h"
 #include "ospf6d.h"
 #include "ospf6_bfd.h"
+#include "ospf6_tlv.h"
 #include "ospf6_gr.h"
 #include "lib/json.h"
 #include "ospf6_nssa.h"

ospf6d/subdir.am

@@ -58,6 +58,7 @@ noinst_HEADERS += \
 	ospf6d/ospf6_route.h \
 	ospf6d/ospf6_routemap_nb.h \
 	ospf6d/ospf6_spf.h \
+	ospf6d/ospf6_tlv.h \
 	ospf6d/ospf6_top.h \
 	ospf6d/ospf6_zebra.h \
 	ospf6d/ospf6d.h \