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