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    1: /*
    2:  * OSPF calculation.
    3:  * Copyright (C) 1999 Kunihiro Ishiguro
    4:  *
    5:  * This file is part of GNU Zebra.
    6:  *
    7:  * GNU Zebra is free software; you can redistribute it and/or modify it
    8:  * under the terms of the GNU General Public License as published by the
    9:  * Free Software Foundation; either version 2, or (at your option) any
   10:  * later version.
   11:  *
   12:  * GNU Zebra is distributed in the hope that it will be useful, but
   13:  * WITHOUT ANY WARRANTY; without even the implied warranty of
   14:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   15:  * General Public License for more details.
   16:  *
   17:  * You should have received a copy of the GNU General Public License
   18:  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
   19:  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   20:  * 02111-1307, USA.
   21:  */
   22: 
   23: #ifndef _QUAGGA_OSPF_SPF_H
   24: #define _QUAGGA_OSPF_SPF_H
   25: 
   26: /* values for vertex->type */
   27: #define OSPF_VERTEX_ROUTER  1  /* for a Router-LSA */
   28: #define OSPF_VERTEX_NETWORK 2  /* for a Network-LSA */
   29: 
   30: /* values for vertex->flags */
   31: #define OSPF_VERTEX_PROCESSED      0x01
   32: 
   33: /* The "root" is the node running the SPF calculation */
   34: 
   35: /* A router or network in an area */
   36: struct vertex
   37: {
   38:   u_char flags;
   39:   u_char type;		/* copied from LSA header */
   40:   struct in_addr id;	/* copied from LSA header */
   41:   struct lsa_header *lsa; /* Router or Network LSA */
   42:   int *stat;		/* Link to LSA status. */
   43:   u_int32_t distance;	/* from root to this vertex */  
   44:   struct list *parents;		/* list of parents in SPF tree */
   45:   struct list *children;	/* list of children in SPF tree*/
   46: };
   47: 
   48: /* A nexthop taken on the root node to get to this (parent) vertex */
   49: struct vertex_nexthop
   50: {
   51:   struct ospf_interface *oi;	/* output intf on root node */
   52:   struct in_addr router;	/* router address to send to */
   53: };
   54: 
   55: struct vertex_parent
   56: {
   57:   struct vertex_nexthop *nexthop; /* link to nexthop info for this parent */
   58:   struct vertex *parent;	/* parent vertex */
   59:   int backlink;			/* index back to parent for router-lsa's */
   60: };
   61: 
   62: extern void ospf_spf_calculate_schedule (struct ospf *);
   63: extern void ospf_rtrs_free (struct route_table *);
   64: 
   65: /* void ospf_spf_calculate_timer_add (); */
   66: 
   67: #endif /* _QUAGGA_OSPF_SPF_H */