isisd/isis_spf.h

   1 /*
   2  * IS-IS Rout(e)ing protocol - isis_spf.h
   3  *                             IS-IS Shortest Path First algorithm
   4  *
   5  * Copyright (C) 2001,2002   Sampo Saaristo
   6  *                           Tampere University of Technology
   7  *                           Institute of Communications Engineering
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public Licenseas published by the Free
  11  * Software Foundation; either version 2 of the License, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  */
  23
  24 #ifndef _ZEBRA_ISIS_SPF_H
  25 #define _ZEBRA_ISIS_SPF_H
  26
  27 enum vertextype
  28 {
  29   VTYPE_PSEUDO_IS = 1,
  30   VTYPE_PSEUDO_TE_IS,
  31   VTYPE_NONPSEUDO_IS,
  32   VTYPE_NONPSEUDO_TE_IS,
  33   VTYPE_ES,
  34   VTYPE_IPREACH_INTERNAL,
  35   VTYPE_IPREACH_EXTERNAL,
  36   VTYPE_IPREACH_TE
  37 #ifdef HAVE_IPV6
  38     ,
  39   VTYPE_IP6REACH_INTERNAL,
  40   VTYPE_IP6REACH_EXTERNAL
  41 #endif /* HAVE_IPV6 */
  42 };
  43
  44 /*
  45  * Triple <N, d(N), {Adj(N)}>
  46  */
  47 struct isis_vertex
  48 {
  49   enum vertextype type;
  50
  51   union
  52   {
  53     u_char id[ISIS_SYS_ID_LEN + 1];
  54     struct prefix prefix;
  55   } N;
  56
  57   u_int32_t d_N;                /* d(N) Distance from this IS      */
  58   u_int16_t depth;              /* The depth in the imaginary tree */
  59   struct list *Adj_N;           /* {Adj(N)} next hop or neighbor list */
  60   struct list *parents;         /* list of parents for ECMP */
  61   struct list *children;        /* list of children used for tree dump */
  62 };
  63
  64 struct isis_spftree
  65 {
  66   struct thread *t_spf;         /* spf threads */
  67   struct list *paths;           /* the SPT */
  68   struct list *tents;           /* TENT */
  69   struct isis_area *area;       /* back pointer to area */
  70   int pending;                  /* already scheduled */
  71   unsigned int runcount;        /* number of runs since uptime */
  72   time_t last_run_timestamp;    /* last run timestamp for scheduling */
  73   time_t last_run_duration;     /* last run duration in msec */
  74 };
  75
  76 struct isis_spftree * isis_spftree_new (struct isis_area *area);
  77 void isis_spftree_del (struct isis_spftree *spftree);
  78 void isis_spftree_adj_del (struct isis_spftree *spftree,
  79                            struct isis_adjacency *adj);
  80 void spftree_area_init (struct isis_area *area);
  81 void spftree_area_del (struct isis_area *area);
  82 void spftree_area_adj_del (struct isis_area *area,
  83                            struct isis_adjacency *adj);
  84 int isis_spf_schedule (struct isis_area *area, int level);
  85 void isis_spf_cmds_init (void);
  86 #ifdef HAVE_IPV6
  87 int isis_spf_schedule6 (struct isis_area *area, int level);
  88 #endif
  89 #endif /* _ZEBRA_ISIS_SPF_H */