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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This is an implementation of Segment Routing over IPv6 (SRv6) for IS-IS
* as per RFC 9352
* https://datatracker.ietf.org/doc/html/rfc9352
*
* Copyright (C) 2023 Carmine Scarpitta - University of Rome Tor Vergata
*/
#ifndef _FRR_ISIS_SRV6_H
#define _FRR_ISIS_SRV6_H
#include "lib/srv6.h"
#include "isisd/isis_tlvs.h"
/* Maximum SRv6 SID Depths supported by the router */
#define SRV6_MAX_SEG_LEFT 3
#define SRV6_MAX_END_POP 3
#define SRV6_MAX_H_ENCAPS 2
#define SRV6_MAX_END_D 5
/* Name of the interface used for installing SRv6 SIDs into the data plane */
#define SRV6_IFNAME "sr0"
/* SRv6 SID structure */
struct isis_srv6_sid_structure {
uint8_t loc_block_len;
uint8_t loc_node_len;
uint8_t func_len;
uint8_t arg_len;
};
/* SRv6 SID not bound to any adjacency */
struct isis_srv6_sid {
struct isis_srv6_sid *next;
/* SID flags */
uint8_t flags;
/* SID value */
struct in6_addr sid;
/* Endpoint behavior bound to the SID */
enum srv6_endpoint_behavior_codepoint behavior;
/* SRv6 SID structure */
struct isis_srv6_sid_structure structure;
/* Parent SRv6 locator */
struct srv6_locator_chunk *locator;
/* Backpointer to IS-IS area */
struct isis_area *area;
};
/* SRv6 Locator */
struct isis_srv6_locator {
struct isis_srv6_locator *next;
uint32_t metric;
uint8_t flags;
#define ISIS_SRV6_LOCATOR_FLAG_D 1 << 7
uint8_t algorithm;
struct prefix_ipv6 prefix;
struct list *srv6_sid;
};
/* SRv6 Adjacency-SID type */
enum srv6_adj_type {
ISIS_SRV6_ADJ_NORMAL = 0,
ISIS_SRV6_LAN_BACKUP,
};
/* SRv6 Adjacency. */
struct srv6_adjacency {
/* Adjacency type */
enum srv6_adj_type type;
/* SID flags */
uint8_t flags;
/* SID value */
struct in6_addr sid;
/* Endpoint behavior bound to the SID */
enum srv6_endpoint_behavior_codepoint behavior;
/* SRv6 SID structure */
struct isis_srv6_sid_structure structure;
/* Parent SRv6 locator */
struct srv6_locator_chunk *locator;
/* Adjacency-SID nexthop information */
struct in6_addr nexthop;
/* End.X SID TI-LFA backup nexthops */
struct list *backup_nexthops;
/* SRv6 (LAN) End.X SID Sub-TLV */
union {
struct isis_srv6_endx_sid_subtlv *endx_sid;
struct isis_srv6_lan_endx_sid_subtlv *lendx_sid;
} u;
/* Back pointer to IS-IS adjacency. */
struct isis_adjacency *adj;
};
/* Per-area IS-IS SRv6 Data Base (SRv6 DB) */
struct isis_srv6_db {
/* List of SRv6 Locator chunks */
struct list *srv6_locator_chunks;
/* List of SRv6 SIDs allocated by the IS-IS instance */
struct list *srv6_sids;
/* List of SRv6 End.X SIDs allocated by the IS-IS instance */
struct list *srv6_endx_sids;
/* Area SRv6 configuration. */
struct {
/* Administrative status of SRv6 */
bool enabled;
/* Name of the SRv6 Locator */
char srv6_locator_name[SRV6_LOCNAME_SIZE];
/* Maximum Segments Left Depth supported by the router */
uint8_t max_seg_left_msd;
/* Maximum Maximum End Pop Depth supported by the router */
uint8_t max_end_pop_msd;
/* Maximum H.Encaps supported by the router */
uint8_t max_h_encaps_msd;
/* Maximum End D MSD supported by the router */
uint8_t max_end_d_msd;
} config;
};
bool isis_srv6_locator_unset(struct isis_area *area);
struct isis_srv6_sid *
isis_srv6_sid_alloc(struct isis_area *area, struct srv6_locator_chunk *chunk,
enum srv6_endpoint_behavior_codepoint behavior,
int sid_func);
extern void isis_srv6_sid_free(struct isis_srv6_sid *sid);
extern void isis_srv6_area_init(struct isis_area *area);
extern void isis_srv6_area_term(struct isis_area *area);
void isis_srv6_init(void);
void isis_srv6_term(void);
void isis_srv6_sid_structure2subsubtlv(
const struct isis_srv6_sid *sid,
struct isis_srv6_sid_structure_subsubtlv *structure_subsubtlv);
void isis_srv6_end_sid2subtlv(const struct isis_srv6_sid *sid,
struct isis_srv6_end_sid_subtlv *sid_subtlv);
void isis_srv6_locator2tlv(const struct isis_srv6_locator *loc,
struct isis_srv6_locator_tlv *loc_tlv);
void srv6_endx_sid_add_single(struct isis_adjacency *adj, bool backup,
struct list *nexthops);
void srv6_endx_sid_add(struct isis_adjacency *adj);
void srv6_endx_sid_del(struct srv6_adjacency *sra);
struct srv6_adjacency *isis_srv6_endx_sid_find(struct isis_adjacency *adj,
enum srv6_adj_type type);
void isis_area_delete_backup_srv6_endx_sids(struct isis_area *area, int level);
#endif /* _FRR_ISIS_SRV6_H */
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