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+/*
+ * IS-IS Rout(e)ing protocol - isis_adjacency.h
+ * IS-IS adjacency handling
+ *
+ * Copyright (C) 2001,2002 Sampo Saaristo
+ * Tampere University of Technology
+ * Institute of Communications Engineering
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public Licenseas 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 _ZEBRA_ISIS_ADJACENCY_H
+#define _ZEBRA_ISIS_ADJACENCY_H
+
+#include "isisd/isis_tlvs.h"
+
+DECLARE_MTYPE(ISIS_ADJACENCY_INFO);
+
+enum isis_adj_usage {
+ ISIS_ADJ_NONE,
+ ISIS_ADJ_LEVEL1,
+ ISIS_ADJ_LEVEL2,
+ ISIS_ADJ_LEVEL1AND2
+};
+
+enum isis_system_type {
+ ISIS_SYSTYPE_UNKNOWN,
+ ISIS_SYSTYPE_ES,
+ ISIS_SYSTYPE_IS,
+ ISIS_SYSTYPE_L1_IS,
+ ISIS_SYSTYPE_L2_IS
+};
+
+enum isis_adj_state {
+ ISIS_ADJ_UNKNOWN,
+ ISIS_ADJ_INITIALIZING,
+ ISIS_ADJ_UP,
+ ISIS_ADJ_DOWN
+};
+
+/*
+ * we use the following codes to give an indication _why_
+ * a specific adjacency is up or down
+ */
+enum isis_adj_updown_reason {
+ ISIS_ADJ_REASON_SEENSELF,
+ ISIS_ADJ_REASON_AREA_MISMATCH,
+ ISIS_ADJ_REASON_HOLDTIMER_EXPIRED,
+ ISIS_ADJ_REASON_AUTH_FAILED,
+ ISIS_ADJ_REASON_CHECKSUM_FAILED
+};
+
+#define DIS_RECORDS 8 /* keep the last 8 DIS state changes on record */
+
+struct isis_dis_record {
+ int dis; /* is our neighbor the DIS ? */
+ time_t last_dis_change; /* timestamp for last dis change */
+};
+
+struct bfd_session;
+struct isis_area;
+
+struct isis_adjacency {
+ uint8_t snpa[ETH_ALEN]; /* NeighbourSNPAAddress */
+ uint8_t sysid[ISIS_SYS_ID_LEN]; /* neighbourSystemIdentifier */
+ uint8_t lanid[ISIS_SYS_ID_LEN + 1]; /* LAN id on bcast circuits */
+ int dischanges[ISIS_LEVELS]; /* how many DIS changes ? */
+ /* an array of N levels for M records */
+ struct isis_dis_record dis_record[DIS_RECORDS * ISIS_LEVELS];
+ enum isis_adj_state adj_state; /* adjacencyState */
+ enum isis_adj_usage adj_usage; /* adjacencyUsage */
+ struct area_addr *area_addresses; /* areaAdressesOfNeighbour */
+ unsigned int area_address_count;
+ struct nlpids nlpids; /* protocols spoken ... */
+ struct in_addr *ipv4_addresses;
+ unsigned int ipv4_address_count;
+ struct in_addr router_address;
+ struct in6_addr *ll_ipv6_addrs; /* Link local IPv6 neighbor address */
+ unsigned int ll_ipv6_count;
+ struct in6_addr *global_ipv6_addrs; /* Global IPv6 neighbor address */
+ unsigned int global_ipv6_count;
+ struct in6_addr router_address6;
+ uint8_t prio[ISIS_LEVELS]; /* priorityOfNeighbour for DIS */
+ int circuit_t; /* from hello PDU hdr */
+ int level; /* level (1 or 2) */
+ enum isis_system_type sys_type; /* neighbourSystemType */
+ uint16_t hold_time; /* entryRemainingTime */
+ time_t last_upd;
+ time_t last_flap; /* last time the adj flapped */
+ enum isis_threeway_state threeway_state;
+ uint32_t ext_circuit_id;
+ int flaps; /* number of adjacency flaps */
+ struct thread *t_expire; /* expire after hold_time */
+ struct isis_circuit *circuit; /* back pointer */
+ uint16_t *mt_set; /* Topologies this adjacency is valid for */
+ unsigned int mt_count; /* Number of entries in mt_set */
+ struct bfd_session_params *bfd_session;
+ struct list *adj_sids; /* Segment Routing Adj-SIDs. */
+ uint32_t snmp_idx;
+ struct listnode *snmp_list_node;
+};
+
+struct isis_threeway_adj;
+
+struct isis_adjacency *isis_adj_lookup(const uint8_t *sysid,
+ struct list *adjdb);
+struct isis_adjacency *isis_adj_lookup_snpa(const uint8_t *ssnpa,
+ struct list *adjdb);
+struct isis_adjacency *isis_adj_find(const struct isis_area *area, int level,
+ const uint8_t *sysid);
+struct isis_adjacency *isis_new_adj(const uint8_t *id, const uint8_t *snpa,
+ int level, struct isis_circuit *circuit);
+void isis_delete_adj(void *adj);
+void isis_adj_process_threeway(struct isis_adjacency *adj,
+ struct isis_threeway_adj *tw_adj,
+ enum isis_adj_usage adj_usage);
+DECLARE_HOOK(isis_adj_state_change_hook, (struct isis_adjacency *adj), (adj));
+DECLARE_HOOK(isis_adj_ip_enabled_hook,
+ (struct isis_adjacency * adj, int family, bool global),
+ (adj, family, global));
+DECLARE_HOOK(isis_adj_ip_disabled_hook,
+ (struct isis_adjacency * adj, int family, bool global),
+ (adj, family, global));
+void isis_log_adj_change(struct isis_adjacency *adj,
+ enum isis_adj_state old_state,
+ enum isis_adj_state new_state, const char *reason);
+void isis_adj_state_change(struct isis_adjacency **adj,
+ enum isis_adj_state state, const char *reason);
+void isis_adj_print(struct isis_adjacency *adj);
+const char *isis_adj_yang_state(enum isis_adj_state state);
+void isis_adj_expire(struct thread *thread);
+void isis_adj_print_vty(struct isis_adjacency *adj, struct vty *vty,
+ char detail);
+void isis_adj_print_json(struct isis_adjacency *adj, struct json_object *json,
+ char detail);
+void isis_adj_build_neigh_list(struct list *adjdb, struct list *list);
+void isis_adj_build_up_list(struct list *adjdb, struct list *list);
+int isis_adj_usage2levels(enum isis_adj_usage usage);
+void isis_bfd_startup_timer(struct thread *thread);
+const char *isis_adj_name(const struct isis_adjacency *adj);
+
+#endif /* ISIS_ADJACENCY_H */