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Diffstat (limited to 'isisd/isis_srv6.h')
| -rw-r--r-- | isisd/isis_srv6.h | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/isisd/isis_srv6.h b/isisd/isis_srv6.h new file mode 100644 index 0000000..3386436 --- /dev/null +++ b/isisd/isis_srv6.h @@ -0,0 +1,181 @@ +// 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" + +#define ISIS_DEFAULT_SRV6_MAX_SEG_LEFT_MSD 3 +#define ISIS_DEFAULT_SRV6_MAX_END_POP_MSD 3 +#define ISIS_DEFAULT_SRV6_MAX_H_ENCAPS_MSD 2 +#define ISIS_DEFAULT_SRV6_MAX_END_D_MSD 5 +#define ISIS_DEFAULT_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; + + /* Interface used for installing SRv6 SIDs into the data plane */ + char srv6_ifname[IF_NAMESIZE]; + } config; +}; + +bool isis_srv6_locator_unset(struct isis_area *area); + +void isis_srv6_interface_set(struct isis_area *area, const char *ifname); + +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); + +int isis_srv6_ifp_up_notify(struct interface *ifp); + +#endif /* _FRR_ISIS_SRV6_H */ |