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Diffstat (limited to '')
| -rw-r--r-- | isisd/isis_lfa.h | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/isisd/isis_lfa.h b/isisd/isis_lfa.h new file mode 100644 index 0000000..9db03a3 --- /dev/null +++ b/isisd/isis_lfa.h @@ -0,0 +1,185 @@ +/* + * Copyright (C) 2020 NetDEF, Inc. + * Renato Westphal + * + * 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_ISIS_LFA_H +#define _FRR_ISIS_LFA_H + +#include "lib/typesafe.h" +#include "lib/zclient.h" +#include "lib/memory.h" + +DECLARE_MTYPE(ISIS_NEXTHOP_LABELS); + +PREDECL_RBTREE_UNIQ(lfa_tiebreaker_tree); +PREDECL_RBTREE_UNIQ(rlfa_tree); + +enum lfa_tiebreaker_type { + LFA_TIEBREAKER_DOWNSTREAM = 0, + LFA_TIEBREAKER_LOWEST_METRIC, + LFA_TIEBREAKER_NODE_PROTECTING, +}; + +struct lfa_tiebreaker { + struct lfa_tiebreaker_tree_item entry; + uint8_t index; + enum lfa_tiebreaker_type type; + struct isis_area *area; +}; +int lfa_tiebreaker_cmp(const struct lfa_tiebreaker *a, + const struct lfa_tiebreaker *b); +DECLARE_RBTREE_UNIQ(lfa_tiebreaker_tree, struct lfa_tiebreaker, entry, + lfa_tiebreaker_cmp); + +struct rlfa { + struct rlfa_tree_item entry; + struct prefix prefix; + struct isis_vertex *vertex; + struct in_addr pq_address; +}; +int rlfa_cmp(const struct rlfa *a, const struct rlfa *b); +DECLARE_RBTREE_UNIQ(rlfa_tree, struct rlfa, entry, rlfa_cmp); + +enum isis_tilfa_sid_type { + TILFA_SID_PREFIX = 1, + TILFA_SID_ADJ, +}; + +struct isis_tilfa_sid { + enum isis_tilfa_sid_type type; + union { + struct { + uint32_t value; + bool remote; + uint8_t remote_sysid[ISIS_SYS_ID_LEN]; + } index; + mpls_label_t label; + } value; +}; + +enum spf_prefix_priority { + SPF_PREFIX_PRIO_CRITICAL = 0, + SPF_PREFIX_PRIO_HIGH, + SPF_PREFIX_PRIO_MEDIUM, + SPF_PREFIX_PRIO_LOW, + SPF_PREFIX_PRIO_MAX, +}; + +struct spf_prefix_priority_acl { + char *name; + struct access_list *list_v4; + struct access_list *list_v6; +}; + +RB_HEAD(isis_spf_nodes, isis_spf_node); +RB_PROTOTYPE(isis_spf_nodes, isis_spf_node, entry, isis_spf_node_compare) +struct isis_spf_node { + RB_ENTRY(isis_spf_node) entry; + + /* Node's System ID. */ + uint8_t sysid[ISIS_SYS_ID_LEN]; + + /* Local adjacencies over which this node is reachable. */ + struct list *adjacencies; + + /* Best metric of all adjacencies used to reach this node. */ + uint32_t best_metric; + + struct { + /* Node's forward SPT. */ + struct isis_spftree *spftree; + + /* Node's reverse SPT. */ + struct isis_spftree *spftree_reverse; + + /* Node's P-space. */ + struct isis_spf_nodes p_space; + } lfa; +}; + +enum lfa_protection_type { + LFA_LINK_PROTECTION = 1, + LFA_NODE_PROTECTION, +}; + +struct lfa_protected_resource { + /* The protection type. */ + enum lfa_protection_type type; + + /* The protected adjacency (might be a pseudonode). */ + uint8_t adjacency[ISIS_SYS_ID_LEN + 1]; + + /* List of nodes reachable over the protected interface. */ + struct isis_spf_nodes nodes; +}; + +/* Forward declaration(s). */ +struct isis_vertex; + +/* Prototypes. */ +void isis_spf_node_list_init(struct isis_spf_nodes *nodes); +void isis_spf_node_list_clear(struct isis_spf_nodes *nodes); +struct isis_spf_node *isis_spf_node_new(struct isis_spf_nodes *nodes, + const uint8_t *sysid); +struct isis_spf_node *isis_spf_node_find(const struct isis_spf_nodes *nodes, + const uint8_t *sysid); +void isis_lfa_tiebreakers_init(struct isis_area *area, int level); +void isis_lfa_tiebreakers_clear(struct isis_area *area, int level); +struct lfa_tiebreaker *isis_lfa_tiebreaker_add(struct isis_area *area, + int level, uint8_t index, + enum lfa_tiebreaker_type type); +void isis_lfa_tiebreaker_delete(struct isis_area *area, int level, + struct lfa_tiebreaker *tie_b); +void isis_lfa_excluded_ifaces_init(struct isis_circuit *circuit, int level); +void isis_lfa_excluded_ifaces_clear(struct isis_circuit *circuit, int level); +void isis_lfa_excluded_iface_add(struct isis_circuit *circuit, int level, + const char *ifname); +void isis_lfa_excluded_iface_delete(struct isis_circuit *circuit, int level, + const char *ifname); +bool isis_lfa_excluded_iface_check(struct isis_circuit *circuit, int level, + const char *ifname); +bool isis_lfa_excise_adj_check(const struct isis_spftree *spftree, + const uint8_t *id); +bool isis_lfa_excise_node_check(const struct isis_spftree *spftree, + const uint8_t *id); +struct isis_spftree *isis_spf_reverse_run(const struct isis_spftree *spftree); +int isis_spf_run_neighbors(struct isis_spftree *spftree); +int isis_rlfa_activate(struct isis_spftree *spftree, struct rlfa *rlfa, + struct zapi_rlfa_response *response); +void isis_rlfa_deactivate(struct isis_spftree *spftree, struct rlfa *rlfa); +void isis_rlfa_list_init(struct isis_spftree *spftree); +void isis_rlfa_list_clear(struct isis_spftree *spftree); +void isis_rlfa_process_ldp_response(struct zapi_rlfa_response *response); +void isis_ldp_rlfa_handle_client_close(struct zapi_client_close_info *info); +void isis_rlfa_check(struct isis_spftree *spftree, struct isis_vertex *vertex); +struct isis_spftree *isis_rlfa_compute(struct isis_area *area, + struct isis_spftree *spftree, + struct isis_spftree *spftree_reverse, + uint32_t max_metric, + struct lfa_protected_resource *resource); +void isis_lfa_compute(struct isis_area *area, struct isis_circuit *circuit, + struct isis_spftree *spftree, + struct lfa_protected_resource *resource); +void isis_spf_run_lfa(struct isis_area *area, struct isis_spftree *spftree); +int isis_tilfa_check(struct isis_spftree *spftree, struct isis_vertex *vertex); +struct isis_spftree * +isis_tilfa_compute(struct isis_area *area, struct isis_spftree *spftree, + struct isis_spftree *spftree_reverse, + struct lfa_protected_resource *protected_resource); + +#endif /* _FRR_ISIS_LFA_H */ |