Initial revision
diff --git a/bgpd/bgp_damp.h b/bgpd/bgp_damp.h
new file mode 100644
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+++ b/bgpd/bgp_damp.h
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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 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. */
+
+/* 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. */
+ int penalty;
+
+ /* Number of flapping. */
+ 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_info. */
+ struct bgp_info *binfo;
+
+ /* Back reference to bgp_node. */
+ struct bgp_node *rn;
+
+ /* Current index in the reuse_list. */
+ int index;
+
+ /* Last time message type. */
+ u_char lastrecord;
+#define BGP_RECORD_UPDATE 1
+#define BGP_RECORD_WITHDRAW 2
+
+ afi_t afi;
+ safi_t safi;
+};
+
+/* Specified parameter set configuration. */
+struct bgp_damp_config
+{
+ /* Value over which routes suppressed. */
+ int suppress_value;
+
+ /* Value below which suppressed routes reused. */
+ int reuse_limit;
+
+ /* Max time a route can be suppressed. */
+ int max_suppress_time;
+
+ /* Time during which accumulated penalty reduces by half. */
+ int half_life;
+
+ /* Non-configurable parameters but fixed at implementation time.
+ * To change this values, init_bgp_damp() should be modified.
+ */
+ int tmax; /* Max time previous instability retained */
+ int reuse_list_size; /* Number of reuse lists */
+ 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 */
+ int decay_rate_per_tick; /* Calculated from half-life */
+ int decay_array_size; /* Calculated using config parameters */
+ double scale_factor;
+ 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;
+};
+
+#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
+
+int bgp_damp_enable (struct bgp *, afi_t, safi_t, int, int, int, int);
+int bgp_damp_disable (struct bgp *, afi_t, safi_t);
+int bgp_damp_withdraw (struct bgp_info *, struct bgp_node *,
+ afi_t, safi_t, int);
+int bgp_damp_update (struct bgp_info *, struct bgp_node *, afi_t, safi_t);
+int bgp_damp_scan (struct bgp_info *, afi_t, safi_t);
+void bgp_damp_info_free (struct bgp_damp_info *, int);
+void bgp_damp_info_clean ();
+char * bgp_get_reuse_time (int, char*, size_t);
+int bgp_damp_decay (time_t, int);
+int bgp_config_write_damp (struct vty *);
+void bgp_damp_info_vty (struct vty *, struct bgp_info *);
+char * bgp_damp_reuse_time_vty (struct vty *, struct bgp_info *);