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ospf_ext.h
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/*
* This is an implementation of RFC7684 OSPFv2 Prefix/Link Attribute
* Advertisement
*
* Module name: Extended Prefix/Link Opaque LSA header definition
*
* Author: Olivier Dugeon <[email protected]>
* Author: Anselme Sawadogo <[email protected]>
*
* Copyright (C) 2016 - 2018 Orange Labs http://www.orange.com
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#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_ */