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    1: /*
    2:  * IS-IS Rout(e)ing protocol - isis_adjacency.h   
    3:  *                             IS-IS adjacency handling
    4:  *
    5:  * Copyright (C) 2001,2002   Sampo Saaristo
    6:  *                           Tampere University of Technology      
    7:  *                           Institute of Communications Engineering
    8:  *
    9:  *
   10:  * This program is free software; you can redistribute it and/or modify it 
   11:  * under the terms of the GNU General Public Licenseas published by the Free 
   12:  * Software Foundation; either version 2 of the License, or (at your option) 
   13:  * any later version.
   14:  *
   15:  * This program is distributed in the hope that it will be useful,but WITHOUT 
   16:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
   17:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
   18:  * more details.
   19: 
   20:  * You should have received a copy of the GNU General Public License along 
   21:  * with this program; if not, write to the Free Software Foundation, Inc., 
   22:  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   23:  */
   24: 
   25: #ifndef _ZEBRA_ISIS_ADJACENCY_H
   26: #define _ZEBRA_ISIS_ADJACENCY_H
   27: 
   28: enum isis_adj_usage
   29: {
   30:   ISIS_ADJ_NONE,
   31:   ISIS_ADJ_LEVEL1,
   32:   ISIS_ADJ_LEVEL2,
   33:   ISIS_ADJ_LEVEL1AND2
   34: };
   35: 
   36: enum isis_system_type
   37: {
   38:   ISIS_SYSTYPE_UNKNOWN,
   39:   ISIS_SYSTYPE_ES,
   40:   ISIS_SYSTYPE_IS,
   41:   ISIS_SYSTYPE_L1_IS,
   42:   ISIS_SYSTYPE_L2_IS
   43: };
   44: 
   45: enum isis_adj_state
   46: {
   47:   ISIS_ADJ_UNKNOWN,
   48:   ISIS_ADJ_INITIALIZING,
   49:   ISIS_ADJ_UP,
   50:   ISIS_ADJ_DOWN
   51: };
   52: 
   53: /*
   54:  * we use the following codes to give an indication _why_
   55:  * a specific adjacency is up or down
   56:  */
   57: enum isis_adj_updown_reason
   58: {
   59:   ISIS_ADJ_REASON_SEENSELF,
   60:   ISIS_ADJ_REASON_AREA_MISMATCH,
   61:   ISIS_ADJ_REASON_HOLDTIMER_EXPIRED,
   62:   ISIS_ADJ_REASON_AUTH_FAILED,
   63:   ISIS_ADJ_REASON_CHECKSUM_FAILED
   64: };
   65: 
   66: #define DIS_RECORDS 8	/* keep the last 8 DIS state changes on record */
   67: 
   68: struct isis_dis_record
   69: {
   70:   int dis;			/* is our neighbor the DIS ? */
   71:   time_t last_dis_change;	/* timestamp for last dis change */
   72: };
   73: 
   74: struct isis_adjacency
   75: {
   76:   u_char snpa[ETH_ALEN];		/* NeighbourSNPAAddress */
   77:   u_char sysid[ISIS_SYS_ID_LEN];	/* neighbourSystemIdentifier */
   78:   u_char lanid[ISIS_SYS_ID_LEN + 1];	/* LAN id on bcast circuits */
   79:   int dischanges[ISIS_LEVELS];		/* how many DIS changes ? */
   80:   /* an array of N levels for M records */
   81:   struct isis_dis_record dis_record[DIS_RECORDS * ISIS_LEVELS];
   82:   enum isis_adj_state adj_state;	/* adjacencyState */
   83:   enum isis_adj_usage adj_usage;	/* adjacencyUsage */
   84:   struct list *area_addrs;		/* areaAdressesOfNeighbour */
   85:   struct nlpids nlpids;			/* protocols spoken ... */
   86:   struct list *ipv4_addrs;
   87:   struct in_addr router_address;
   88: #ifdef HAVE_IPV6
   89:   struct list *ipv6_addrs;
   90:   struct in6_addr router_address6;
   91: #endif				/* HAVE_IPV6 */
   92:   u_char prio[ISIS_LEVELS];	/* priorityOfNeighbour for DIS */
   93:   int circuit_t;		/* from hello PDU hdr */
   94:   int level;			/* level (1 or 2) */
   95:   enum isis_system_type sys_type;	/* neighbourSystemType */
   96:   u_int16_t hold_time;		/* entryRemainingTime */
   97:   u_int32_t last_upd;
   98:   u_int32_t last_flap;		/* last time the adj flapped */
   99:   int flaps;			/* number of adjacency flaps  */
  100:   struct thread *t_expire;	/* expire after hold_time  */
  101:   struct isis_circuit *circuit;	/* back pointer */
  102: };
  103: 
  104: struct isis_adjacency *isis_adj_lookup (u_char * sysid, struct list *adjdb);
  105: struct isis_adjacency *isis_adj_lookup_snpa (u_char * ssnpa,
  106: 					     struct list *adjdb);
  107: struct isis_adjacency *isis_new_adj (u_char * id, u_char * snpa, int level,
  108: 				     struct isis_circuit *circuit);
  109: void isis_delete_adj (void *adj);
  110: void isis_adj_state_change (struct isis_adjacency *adj,
  111: 			    enum isis_adj_state state, const char *reason);
  112: void isis_adj_print (struct isis_adjacency *adj);
  113: int isis_adj_expire (struct thread *thread);
  114: void isis_adj_print_vty (struct isis_adjacency *adj, struct vty *vty, char detail);
  115: void isis_adj_build_neigh_list (struct list *adjdb, struct list *list);
  116: void isis_adj_build_up_list (struct list *adjdb, struct list *list);
  117: 
  118: #endif /* ISIS_ADJACENCY_H */