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/* BGP flap dampening
* Copyright (C) 2001 IP Infusion Inc.
*
* 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_BGP_DAMP_H
#define _QUAGGA_BGP_DAMP_H
#include "bgpd/bgp_table.h"
/* Structure maintained on a per-route basis. */
struct bgp_damp_info {
/* Doubly linked list. This information must be linked to
reuse_list or no_reuse_list. */
struct bgp_damp_info *next;
struct bgp_damp_info *prev;
/* Figure-of-merit. */
unsigned int penalty;
/* Number of flapping. */
unsigned int flap;
/* First flap time */
time_t start_time;
/* Last time penalty was updated. */
time_t t_updated;
/* Time of route start to be suppressed. */
time_t suppress_time;
/* Back reference to bgp_path_info. */
struct bgp_path_info *path;
/* Back reference to bgp_node. */
struct bgp_dest *dest;
/* Current index in the reuse_list. */
int index;
/* Last time message type. */
uint8_t lastrecord;
#define BGP_RECORD_UPDATE 1U
#define BGP_RECORD_WITHDRAW 2U
afi_t afi;
safi_t safi;
};
/* Specified parameter set configuration. */
struct bgp_damp_config {
/* Value over which routes suppressed. */
unsigned int suppress_value;
/* Value below which suppressed routes reused. */
unsigned int reuse_limit;
/* Max time a route can be suppressed. */
time_t max_suppress_time;
/* Time during which accumulated penalty reduces by half. */
time_t half_life;
/* Non-configurable parameters but fixed at implementation time.
* To change this values, init_bgp_damp() should be modified.
*/
time_t tmax; /* Max time previous instability retained */
unsigned int reuse_list_size; /* Number of reuse lists */
unsigned int reuse_index_size; /* Size of reuse index array */
/* Non-configurable parameters. Most of these are calculated from
* the configurable parameters above.
*/
unsigned int ceiling; /* Max value a penalty can attain */
unsigned int decay_rate_per_tick; /* Calculated from half-life */
unsigned int decay_array_size; /* Calculated using config parameters */
double scale_factor;
unsigned int reuse_scale_factor;
/* Decay array per-set based. */
double *decay_array;
/* Reuse index array per-set based. */
int *reuse_index;
/* Reuse list array per-set based. */
struct bgp_damp_info **reuse_list;
int reuse_offset;
/* All dampening information which is not on reuse list. */
struct bgp_damp_info *no_reuse_list;
/* Reuse timer thread per-set base. */
struct thread *t_reuse;
afi_t afi;
safi_t safi;
};
#define BGP_DAMP_NONE 0
#define BGP_DAMP_USED 1
#define BGP_DAMP_SUPPRESSED 2
/* Time granularity for reuse lists */
#define DELTA_REUSE 10
/* Time granularity for decay arrays */
#define DELTA_T 5
#define DEFAULT_PENALTY 1000
#define DEFAULT_HALF_LIFE 15
#define DEFAULT_REUSE 750
#define DEFAULT_SUPPRESS 2000
#define REUSE_LIST_SIZE 256
#define REUSE_ARRAY_SIZE 1024
extern int bgp_damp_enable(struct bgp *bgp, afi_t afi, safi_t safi, time_t half,
unsigned int reuse, unsigned int suppress,
time_t max);
extern int bgp_damp_disable(struct bgp *bgp, afi_t afi, safi_t safi);
extern int bgp_damp_withdraw(struct bgp_path_info *path, struct bgp_dest *dest,
afi_t afi, safi_t safi, int attr_change);
extern int bgp_damp_update(struct bgp_path_info *path, struct bgp_dest *dest,
afi_t afi, safi_t saff);
extern void bgp_damp_info_free(struct bgp_damp_info *path, int withdraw,
afi_t afi, safi_t safi);
extern void bgp_damp_info_clean(afi_t afi, safi_t safi);
extern int bgp_damp_decay(time_t tdiff, int penalty,
struct bgp_damp_config *damp);
extern void bgp_config_write_damp(struct vty *vty, afi_t afi, safi_t safi);
extern void bgp_damp_info_vty(struct vty *vty, struct bgp_path_info *path,
afi_t afi, safi_t safi, json_object *json_path);
extern const char *bgp_damp_reuse_time_vty(struct vty *vty,
struct bgp_path_info *path,
char *timebuf, size_t len, afi_t afi,
safi_t safi, bool use_json,
json_object *json);
extern int bgp_show_dampening_parameters(struct vty *vty, afi_t afi,
safi_t safi, uint16_t show_flags);
#endif /* _QUAGGA_BGP_DAMP_H */
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