ospfd/ospf_spf.h

   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 /* What triggered the SPF ? */
  63 typedef enum {
  64   SPF_FLAG_ROUTER_LSA_INSTALL = 1,
  65   SPF_FLAG_NETWORK_LSA_INSTALL,
  66   SPF_FLAG_SUMMARY_LSA_INSTALL,
  67   SPF_FLAG_ASBR_SUMMARY_LSA_INSTALL,
  68   SPF_FLAG_MAXAGE,
  69   SPF_FLAG_ABR_STATUS_CHANGE,
  70   SPF_FLAG_ASBR_STATUS_CHANGE,
  71   SPF_FLAG_CONFIG_CHANGE,
  72 } ospf_spf_reason_t;
  73
  74 extern void ospf_spf_calculate_schedule (struct ospf *, ospf_spf_reason_t);
  75 extern void ospf_rtrs_free (struct route_table *);
  76
  77 /* void ospf_spf_calculate_timer_add (); */
  78 #endif /* _QUAGGA_OSPF_SPF_H */