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e6685141aa
Effectively a massive search and replace of `struct thread` to `struct event`. Using the term `thread` gives people the thought that this event system is a pthread when it is not Signed-off-by: Donald Sharp <sharpd@nvidia.com>
145 lines
4.1 KiB
C
145 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* BGP flap dampening
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* Copyright (C) 2001 IP Infusion Inc.
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*/
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#ifndef _QUAGGA_BGP_DAMP_H
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#define _QUAGGA_BGP_DAMP_H
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#include "bgpd/bgp_table.h"
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/* Structure maintained on a per-route basis. */
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struct bgp_damp_info {
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/* Doubly linked list. This information must be linked to
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reuse_list or no_reuse_list. */
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struct bgp_damp_info *next;
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struct bgp_damp_info *prev;
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/* Figure-of-merit. */
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unsigned int penalty;
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/* Number of flapping. */
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unsigned int flap;
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/* First flap time */
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time_t start_time;
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/* Last time penalty was updated. */
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time_t t_updated;
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/* Time of route start to be suppressed. */
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time_t suppress_time;
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/* Back reference to bgp_path_info. */
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struct bgp_path_info *path;
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/* Back reference to bgp_node. */
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struct bgp_dest *dest;
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/* Current index in the reuse_list. */
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int index;
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/* Last time message type. */
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uint8_t lastrecord;
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#define BGP_RECORD_UPDATE 1U
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#define BGP_RECORD_WITHDRAW 2U
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afi_t afi;
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safi_t safi;
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};
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/* Specified parameter set configuration. */
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struct bgp_damp_config {
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/* Value over which routes suppressed. */
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unsigned int suppress_value;
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/* Value below which suppressed routes reused. */
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unsigned int reuse_limit;
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/* Max time a route can be suppressed. */
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time_t max_suppress_time;
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/* Time during which accumulated penalty reduces by half. */
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time_t half_life;
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/* Non-configurable parameters but fixed at implementation time.
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* To change this values, init_bgp_damp() should be modified.
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*/
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time_t tmax; /* Max time previous instability retained */
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unsigned int reuse_list_size; /* Number of reuse lists */
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unsigned int reuse_index_size; /* Size of reuse index array */
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/* Non-configurable parameters. Most of these are calculated from
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* the configurable parameters above.
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*/
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unsigned int ceiling; /* Max value a penalty can attain */
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unsigned int decay_rate_per_tick; /* Calculated from half-life */
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unsigned int decay_array_size; /* Calculated using config parameters */
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double scale_factor;
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unsigned int reuse_scale_factor;
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/* Decay array per-set based. */
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double *decay_array;
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/* Reuse index array per-set based. */
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int *reuse_index;
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/* Reuse list array per-set based. */
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struct bgp_damp_info **reuse_list;
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int reuse_offset;
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/* All dampening information which is not on reuse list. */
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struct bgp_damp_info *no_reuse_list;
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/* Reuse timer thread per-set base. */
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struct event *t_reuse;
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afi_t afi;
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safi_t safi;
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};
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#define BGP_DAMP_NONE 0
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#define BGP_DAMP_USED 1
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#define BGP_DAMP_SUPPRESSED 2
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/* Time granularity for reuse lists */
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#define DELTA_REUSE 10
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/* Time granularity for decay arrays */
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#define DELTA_T 5
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#define DEFAULT_PENALTY 1000
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#define DEFAULT_HALF_LIFE 15
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#define DEFAULT_REUSE 750
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#define DEFAULT_SUPPRESS 2000
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#define REUSE_LIST_SIZE 256
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#define REUSE_ARRAY_SIZE 1024
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extern int bgp_damp_enable(struct bgp *bgp, afi_t afi, safi_t safi, time_t half,
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unsigned int reuse, unsigned int suppress,
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time_t max);
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extern int bgp_damp_disable(struct bgp *bgp, afi_t afi, safi_t safi);
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extern int bgp_damp_withdraw(struct bgp_path_info *path, struct bgp_dest *dest,
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afi_t afi, safi_t safi, int attr_change);
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extern int bgp_damp_update(struct bgp_path_info *path, struct bgp_dest *dest,
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afi_t afi, safi_t saff);
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extern void bgp_damp_info_free(struct bgp_damp_info *path, int withdraw,
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afi_t afi, safi_t safi);
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extern void bgp_damp_info_clean(afi_t afi, safi_t safi);
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extern int bgp_damp_decay(time_t tdiff, int penalty,
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struct bgp_damp_config *damp);
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extern void bgp_config_write_damp(struct vty *vty, afi_t afi, safi_t safi);
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extern void bgp_damp_info_vty(struct vty *vty, struct bgp_path_info *path,
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afi_t afi, safi_t safi, json_object *json_path);
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extern const char *bgp_damp_reuse_time_vty(struct vty *vty,
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struct bgp_path_info *path,
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char *timebuf, size_t len, afi_t afi,
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safi_t safi, bool use_json,
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json_object *json);
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extern int bgp_show_dampening_parameters(struct vty *vty, afi_t afi,
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safi_t safi, uint16_t show_flags);
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#endif /* _QUAGGA_BGP_DAMP_H */
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