text: /*
   * 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; if not, write to the Free Software Foundation, Inc., 
   * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   */
  
  #ifndef _ZEBRA_ISIS_ADJACENCY_H
  #define _ZEBRA_ISIS_ADJACENCY_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 isis_adjacency
  {
    u_char snpa[ETH_ALEN];        /* NeighbourSNPAAddress */
    u_char sysid[ISIS_SYS_ID_LEN];    /* neighbourSystemIdentifier */
    u_char 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 list *area_addrs;      /* areaAdressesOfNeighbour */
    struct nlpids nlpids;         /* protocols spoken ... */
    struct list *ipv4_addrs;
    struct in_addr router_address;
  #ifdef HAVE_IPV6
    struct list *ipv6_addrs;
    struct in6_addr router_address6;
  #endif              /* HAVE_IPV6 */
    u_char 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 */
    u_int16_t hold_time;      /* entryRemainingTime */
    u_int32_t last_upd;
    u_int32_t last_flap;      /* last time the adj flapped */
    int flaps;            /* number of adjacency flaps  */
    struct thread *t_expire;  /* expire after hold_time  */
    struct isis_circuit *circuit; /* back pointer */
  };
  
  struct isis_adjacency *isis_adj_lookup (u_char * sysid, struct list *adjdb);
  struct isis_adjacency *isis_adj_lookup_snpa (u_char * ssnpa,
                           struct list *adjdb);
  struct isis_adjacency *isis_new_adj (u_char * id, u_char * snpa, int level,
                       struct isis_circuit *circuit);
  void isis_delete_adj (void *adj);
  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);
  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);
  
  #endif /* ISIS_ADJACENCY_H */
  