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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"
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 *ipv6_addresses;
unsigned int ipv6_address_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 */
uint32_t last_upd;
uint32_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 *bfd_session;
struct list *adj_sids; /* Segment Routing Adj-SIDs. */
};
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);
bool isis_adj_exists(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), (adj, family))
DECLARE_HOOK(isis_adj_ip_disabled_hook,
(struct isis_adjacency *adj, int family), (adj, family))
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);
int isis_adj_expire(struct thread *thread);
void isis_adj_print_vty(struct isis_adjacency *adj, struct vty *vty,
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);
#endif /* ISIS_ADJACENCY_H */
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