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/*
* OSPF flap dampening by Manav Bhatia
* Copyright (C) 2002
*
* 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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
/*
* Flap Damping (target e.g. link/route)
*/
#define HAVE_OSPF6_DAMP
typedef enum
{
OFF,
ON,
} onoff_t;
typedef enum
{
event_none,
event_up,
event_down,
} damp_event_t;
/* Structure maintained per target basis */
struct ospf6_damp_info
{
/* identifier to decide which target */
u_short type;
struct prefix name;
/* do we damping this info */
onoff_t damping;
u_int penalty;
u_int flap;
time_t t_start; /* First flap (down event) time */
time_t t_updated; /* Last time the penalty was updated */
/* index and double-link for reuse list */
int index;
struct ospf6_damp_info *next;
struct ospf6_damp_info *prev;
/* the last event that we are avoiding */
int (*event) (void *target);
void *target;
damp_event_t event_type;
damp_event_t target_status;
};
#define OSPF6_DAMP_TYPE_ROUTE 0
#define OSPF6_DAMP_TYPE_MAX 1
/* Global Configuration Parameters */
struct ospf6_damp_config
{
/* is damping enabled ? */
onoff_t enabled;
/* configurable parameters */
u_int half_life;
u_int suppress;
u_int reuse;
u_int t_hold; /* Maximum hold down time */
/* Non configurable parameters */
u_int delta_t;
u_int delta_reuse;
u_int default_penalty;
u_int ceiling; /* Max value a penalty can attain */
double scale_factor;
int decay_array_size; /* Calculated using config parameters */
double *decay_array; /* Storage for decay values */
int reuse_index_array_size; /* Size of reuse index array */
int *reuse_index_array;
int reuse_list_size; /* Number of reuse lists */
struct ospf6_damp_info **reuse_list_array;
};
int ospf6_damp_reuse_timer (struct thread *);
void ospf6_damp_event_up (u_short type, struct prefix *name,
int (*exec_up) (void *), void *target);
void ospf6_damp_event_down (u_short type, struct prefix *name,
int (*exec_down) (void *), void *target);
void ospf6_damp_config_write (struct vty *);
void ospf6_damp_init ();
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