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201 lines
6.2 KiB
C
201 lines
6.2 KiB
C
/*
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* This is an implementation of RFC7684 OSPFv2 Prefix/Link Attribute
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* Advertisement
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*
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* Module name: Extended Prefix/Link Opaque LSA header definition
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*
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* Author: Olivier Dugeon <olivier.dugeon@orange.com>
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* Author: Anselme Sawadogo <anselmesawadogo@gmail.com>
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*
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* Copyright (C) 2016 - 2018 Orange Labs http://www.orange.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _FRR_OSPF_EXT_PREF_H_
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#define _FRR_OSPF_EXT_PREF_H_
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/*
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* Opaque LSA's link state ID for Extended Prefix/Link is
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* structured as follows.
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*
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* 24 16 8 0
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* +--------+--------+--------+--------+
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* | 7/8 |........|........|........|
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* +--------+--------+--------+--------+
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* |<-Type->|<------- Instance ------->|
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*
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*
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* Type: IANA has assigned '7' for Extended Prefix Opaque LSA
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* and '8' for Extended Link Opaque LSA
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* Instance: User may select arbitrary 24-bit values to identify
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* different instances of Extended Prefix/Link Opaque LSA
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*
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*/
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/*
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* 24 16 8 0
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* +--------+--------+--------+--------+ ---
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* | LS age |Options | 10,11 | A
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* +--------+--------+--------+--------+ | Standard (Opaque) LSA header;
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* | 7/8 | Instance | |
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* +--------+--------+--------+--------+ | Type 10 or 11 are used for Extended
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* | Advertising router | | Prefix Opaque LSA
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* +--------+--------+--------+--------+ |
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* | LS sequence number | | Type 10 only is used for Extended
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* +--------+--------+--------+--------+ | Link Opaque LSA
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* | LS checksum | Length | V
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* +--------+--------+--------+--------+ ---
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* | Type | Length | A
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* +--------+--------+--------+--------+ | TLV part for Extended Prefix/Link
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* | | | Opaque LSA;
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* ~ Values ... ~ | Values might be structured as a set
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* | | V of sub-TLVs.
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* +--------+--------+--------+--------+ ---
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*/
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/* Global use constant numbers */
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#define MAX_LEGAL_EXT_INSTANCE_NUM (0xffff)
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#define LEGAL_EXT_INSTANCE_RANGE(i) (0 <= (i) && (i) <= 0xffff)
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/* Flags to manage Extended Link/Prefix Opaque LSA */
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#define EXT_LPFLG_LSA_INACTIVE 0x00
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#define EXT_LPFLG_LSA_ACTIVE 0x01
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#define EXT_LPFLG_LSA_ENGAGED 0x02
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#define EXT_LPFLG_LSA_LOOKUP_DONE 0x04
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#define EXT_LPFLG_LSA_FORCED_REFRESH 0x08
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#define EXT_LPFLG_FIB_ENTRY_SET 0x10
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/*
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* Following section defines TLV (tag, length, value) structures,
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* used in Extended Prefix/Link Opaque LSA.
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*/
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/* Extended Prefix TLV Route Types */
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#define EXT_TLV_PREF_ROUTE_UNSPEC 0
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#define EXT_TLV_PREF_ROUTE_INTRA_AREA 1
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#define EXT_TLV_PREF_ROUTE_INTER_AREA 3
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#define EXT_TLV_PREF_ROUTE_AS_EXT 5
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#define EXT_TLV_PREF_ROUTE_NSSA_EXT 7
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/*
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* Extended Prefix and Extended Prefix Range TLVs'
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* Address family flag for IPv4
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*/
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#define EXT_TLV_PREF_AF_IPV4 0
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/* Extended Prefix TLV Flags */
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#define EXT_TLV_PREF_AFLG 0x80
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#define EXT_TLV_PREF_NFLG 0x40
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/* Extended Prefix Range TLV Flags */
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#define EXT_TLV_PREF_RANGE_IAFLG 0x80
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/* ERO subtlvs Flags */
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#define EXT_SUBTLV_ERO_LFLG 0x80
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/* Extended Prefix TLV see RFC 7684 section 2.1 */
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#define EXT_TLV_PREFIX 1
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#define EXT_TLV_PREFIX_SIZE 8
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struct ext_tlv_prefix {
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struct tlv_header header;
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uint8_t route_type;
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uint8_t pref_length;
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uint8_t af;
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uint8_t flags;
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struct in_addr address;
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};
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/* Extended Link TLV see RFC 7684 section 3.1 */
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#define EXT_TLV_LINK 1
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#define EXT_TLV_LINK_SIZE 12
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struct ext_tlv_link {
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struct tlv_header header;
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uint8_t link_type;
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uint8_t reserved[3];
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struct in_addr link_id;
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struct in_addr link_data;
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};
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/* Remote Interface Address Sub-TLV, Cisco experimental use Sub-TLV */
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#define EXT_SUBTLV_RMT_ITF_ADDR 32768
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#define EXT_SUBTLV_RMT_ITF_ADDR_SIZE 4
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struct ext_subtlv_rmt_itf_addr {
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struct tlv_header header;
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struct in_addr value;
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};
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/* Internal structure to manage Extended Link/Prefix Opaque LSA */
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struct ospf_ext_lp {
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bool enabled;
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/* Flags to manage this Extended Prefix/Link Opaque LSA */
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uint32_t flags;
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/*
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* Scope is area Opaque Type 10 or AS Opaque LSA Type 11 for
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* Extended Prefix and area Opaque Type 10 for Extended Link
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*/
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uint8_t scope;
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/* area pointer if flooding is Type 10 Null if flooding is AS scope */
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struct ospf_area *area;
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struct in_addr area_id;
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/* List of interface with Segment Routing enable */
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struct list *iflist;
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};
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/* Structure to aggregate interfaces information for Extended Prefix/Link */
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struct ext_itf {
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/* 24-bit Opaque-ID field value according to RFC 7684 specification */
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uint32_t instance;
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uint8_t type; /* Extended Prefix (7) or Link (8) */
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/* Reference pointer to a Zebra-interface. */
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struct interface *ifp;
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/* Area info in which this SR link belongs to. */
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struct ospf_area *area;
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/* Flags to manage this link parameters. */
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uint32_t flags;
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/* SID type: Node, Adjacency or LAN Adjacency */
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enum sid_type stype;
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/* extended link/prefix TLV information */
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struct ext_tlv_prefix prefix;
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struct ext_subtlv_prefix_sid node_sid;
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struct ext_tlv_link link;
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struct ext_subtlv_adj_sid adj_sid[2];
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struct ext_subtlv_lan_adj_sid lan_sid[2];
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/* cisco experimental subtlv */
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struct ext_subtlv_rmt_itf_addr rmt_itf_addr;
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};
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/* Prototypes. */
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extern int ospf_ext_init(void);
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extern void ospf_ext_term(void);
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extern void ospf_ext_finish(void);
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extern void ospf_ext_update_sr(bool enable);
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extern uint32_t ospf_ext_schedule_prefix_index(struct interface *ifp,
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uint32_t index,
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struct prefix_ipv4 *p,
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uint8_t flags);
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#endif /* _FRR_OSPF_EXT_PREF_H_ */
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