1 files changed, 55 insertions, 0 deletions
diff --git a/ospf6d/ospf6_tlv.h b/ospf6d/ospf6_tlv.h
new file mode 100644
index 00000000..a687a059
--- /dev/null
+++ b/ospf6d/ospf6_tlv.h
@@ -0,0 +1,55 @@
+// 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_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 */