mirror of https://github.com/FRRouting/frr.git
145 lines
4.1 KiB
C
145 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/* BGP flap dampening
|
|
* Copyright (C) 2001 IP Infusion Inc.
|
|
*/
|
|
|
|
#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 */
|