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Diffstat (limited to 'ospfd/ospf_ext.h')
| -rw-r--r-- | ospfd/ospf_ext.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/ospfd/ospf_ext.h b/ospfd/ospf_ext.h new file mode 100644 index 0000000..535e548 --- /dev/null +++ b/ospfd/ospf_ext.h @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * This is an implementation of RFC7684 OSPFv2 Prefix/Link Attribute + * Advertisement + * + * Module name: Extended Prefix/Link Opaque LSA header definition + * + * Author: Olivier Dugeon <olivier.dugeon@orange.com> + * Author: Anselme Sawadogo <anselmesawadogo@gmail.com> + * + * Copyright (C) 2016 - 2018 Orange Labs http://www.orange.com + */ + +#ifndef _FRR_OSPF_EXT_PREF_H_ +#define _FRR_OSPF_EXT_PREF_H_ + +/* + * Opaque LSA's link state ID for Extended Prefix/Link is + * structured as follows. + * + * 24 16 8 0 + * +--------+--------+--------+--------+ + * | 7/8 |........|........|........| + * +--------+--------+--------+--------+ + * |<-Type->|<------- Instance ------->| + * + * + * Type: IANA has assigned '7' for Extended Prefix Opaque LSA + * and '8' for Extended Link Opaque LSA + * Instance: User may select arbitrary 24-bit values to identify + * different instances of Extended Prefix/Link Opaque LSA + * + */ + +/* + * 24 16 8 0 + * +--------+--------+--------+--------+ --- + * | LS age |Options | 10,11 | A + * +--------+--------+--------+--------+ | Standard (Opaque) LSA header; + * | 7/8 | Instance | | + * +--------+--------+--------+--------+ | Type 10 or 11 are used for Extended + * | Advertising router | | Prefix Opaque LSA + * +--------+--------+--------+--------+ | + * | LS sequence number | | Type 10 only is used for Extended + * +--------+--------+--------+--------+ | Link Opaque LSA + * | LS checksum | Length | V + * +--------+--------+--------+--------+ --- + * | Type | Length | A + * +--------+--------+--------+--------+ | TLV part for Extended Prefix/Link + * | | | Opaque LSA; + * ~ Values ... ~ | Values might be structured as a set + * | | V of sub-TLVs. + * +--------+--------+--------+--------+ --- + */ + +/* Global use constant numbers */ + +#define MAX_LEGAL_EXT_INSTANCE_NUM (0xffff) +#define LEGAL_EXT_INSTANCE_RANGE(i) (0 <= (i) && (i) <= 0xffff) + +/* Flags to manage Extended Link/Prefix Opaque LSA */ +#define EXT_LPFLG_LSA_INACTIVE 0x00 +#define EXT_LPFLG_LSA_ACTIVE 0x01 +#define EXT_LPFLG_LSA_ENGAGED 0x02 +#define EXT_LPFLG_LSA_LOOKUP_DONE 0x04 +#define EXT_LPFLG_LSA_FORCED_REFRESH 0x08 +#define EXT_LPFLG_FIB_ENTRY_SET 0x10 + +/* + * Following section defines TLV (tag, length, value) structures, + * used in Extended Prefix/Link Opaque LSA. + */ + +/* Extended Prefix TLV Route Types */ +#define EXT_TLV_PREF_ROUTE_UNSPEC 0 +#define EXT_TLV_PREF_ROUTE_INTRA_AREA 1 +#define EXT_TLV_PREF_ROUTE_INTER_AREA 3 +#define EXT_TLV_PREF_ROUTE_AS_EXT 5 +#define EXT_TLV_PREF_ROUTE_NSSA_EXT 7 + +/* + * Extended Prefix and Extended Prefix Range TLVs' + * Address family flag for IPv4 + */ +#define EXT_TLV_PREF_AF_IPV4 0 + +/* Extended Prefix TLV Flags */ +#define EXT_TLV_PREF_AFLG 0x80 +#define EXT_TLV_PREF_NFLG 0x40 + +/* Extended Prefix Range TLV Flags */ +#define EXT_TLV_PREF_RANGE_IAFLG 0x80 + +/* ERO subtlvs Flags */ +#define EXT_SUBTLV_ERO_LFLG 0x80 + +/* Extended Prefix TLV see RFC 7684 section 2.1 */ +#define EXT_TLV_PREFIX 1 +#define EXT_TLV_PREFIX_SIZE 8 +struct ext_tlv_prefix { + struct tlv_header header; + uint8_t route_type; + uint8_t pref_length; + uint8_t af; + uint8_t flags; + struct in_addr address; +}; + +/* Extended Link TLV see RFC 7684 section 3.1 */ +#define EXT_TLV_LINK 1 +#define EXT_TLV_LINK_SIZE 12 +struct ext_tlv_link { + struct tlv_header header; + uint8_t link_type; + uint8_t reserved[3]; + struct in_addr link_id; + struct in_addr link_data; +}; + +/* Remote Interface Address Sub-TLV, Cisco experimental use Sub-TLV */ +#define EXT_SUBTLV_RMT_ITF_ADDR 32768 +#define EXT_SUBTLV_RMT_ITF_ADDR_SIZE 4 +struct ext_subtlv_rmt_itf_addr { + struct tlv_header header; + struct in_addr value; +}; + +/* Internal structure to manage Extended Link/Prefix Opaque LSA */ +struct ospf_ext_lp { + bool enabled; + + /* Flags to manage this Extended Prefix/Link Opaque LSA */ + uint32_t flags; + + /* + * Scope is area Opaque Type 10 or AS Opaque LSA Type 11 for + * Extended Prefix and area Opaque Type 10 for Extended Link + */ + uint8_t scope; + + /* List of interface with Segment Routing enable */ + struct list *iflist; +}; + +/* Structure to aggregate interfaces information for Extended Prefix/Link */ +struct ext_itf { + /* 24-bit Opaque-ID field value according to RFC 7684 specification */ + uint32_t instance; + uint8_t type; /* Extended Prefix (7) or Link (8) */ + + /* Reference pointer to a Zebra-interface. */ + struct interface *ifp; + + /* Area info in which this SR link belongs to. */ + struct ospf_area *area; + + /* Flags to manage this link parameters. */ + uint32_t flags; + + /* SID type: Node, Adjacency or LAN Adjacency */ + enum sid_type stype; + + /* extended link/prefix TLV information */ + struct ext_tlv_prefix prefix; + struct ext_subtlv_prefix_sid node_sid; + struct ext_tlv_link link; + struct ext_subtlv_adj_sid adj_sid[2]; + struct ext_subtlv_lan_adj_sid lan_sid[2]; + + /* cisco experimental subtlv */ + struct ext_subtlv_rmt_itf_addr rmt_itf_addr; +}; + +/* Prototypes. */ +extern int ospf_ext_init(void); +extern void ospf_ext_term(void); +extern void ospf_ext_finish(void); +extern void ospf_ext_update_sr(bool enable); +extern void ospf_ext_link_srlb_update(void); +extern uint32_t ospf_ext_schedule_prefix_index(struct interface *ifp, + uint32_t index, + struct prefix_ipv4 *p, + uint8_t flags); +#endif /* _FRR_OSPF_EXT_PREF_H_ */ |