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/*
* OSPF calculation.
* Copyright (C) 1999 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra 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; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _QUAGGA_OSPF_SPF_H
#define _QUAGGA_OSPF_SPF_H
#include "typesafe.h"
/* values for vertex->type */
#define OSPF_VERTEX_ROUTER 1 /* for a Router-LSA */
#define OSPF_VERTEX_NETWORK 2 /* for a Network-LSA */
/* values for vertex->flags */
#define OSPF_VERTEX_PROCESSED 0x01
/* The "root" is the node running the SPF calculation */
PREDECL_SKIPLIST_NONUNIQ(vertex_pqueue)
/* A router or network in an area */
struct vertex {
struct vertex_pqueue_item pqi;
uint8_t flags;
uint8_t type; /* copied from LSA header */
struct in_addr id; /* copied from LSA header */
struct ospf_lsa *lsa_p;
struct lsa_header *lsa; /* Router or Network LSA */
uint32_t distance; /* from root to this vertex */
struct list *parents; /* list of parents in SPF tree */
struct list *children; /* list of children in SPF tree*/
};
/* A nexthop taken on the root node to get to this (parent) vertex */
struct vertex_nexthop {
struct in_addr router; /* router address to send to */
int lsa_pos; /* LSA position for resolving the interface */
};
struct vertex_parent {
struct vertex_nexthop *nexthop; /* nexthop address for this parent */
struct vertex *parent; /* parent vertex */
int backlink; /* index back to parent for router-lsa's */
};
/* What triggered the SPF ? */
typedef enum {
SPF_FLAG_ROUTER_LSA_INSTALL = 1,
SPF_FLAG_NETWORK_LSA_INSTALL,
SPF_FLAG_SUMMARY_LSA_INSTALL,
SPF_FLAG_ASBR_SUMMARY_LSA_INSTALL,
SPF_FLAG_MAXAGE,
SPF_FLAG_ABR_STATUS_CHANGE,
SPF_FLAG_ASBR_STATUS_CHANGE,
SPF_FLAG_CONFIG_CHANGE,
} ospf_spf_reason_t;
extern void ospf_spf_calculate_schedule(struct ospf *, ospf_spf_reason_t);
extern void ospf_spf_calculate(struct ospf_area *area,
struct ospf_lsa *root_lsa,
struct route_table *new_table,
struct route_table *new_rtrs, bool is_dry_run);
extern int ospf_spf_calculate_areas(struct ospf *ospf,
struct route_table *new_table,
struct route_table *new_rtrs,
bool is_dry_run);
extern void ospf_rtrs_free(struct route_table *);
/* void ospf_spf_calculate_timer_add (); */
#endif /* _QUAGGA_OSPF_SPF_H */
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