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1 | /* BGP flap dampening | |
2 | Copyright (C) 2001 IP Infusion Inc. | |
3 | ||
4 | This file is part of GNU Zebra. | |
5 | ||
6 | GNU Zebra is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by the | |
8 | Free Software Foundation; either version 2, or (at your option) any | |
9 | later version. | |
10 | ||
11 | GNU Zebra is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Zebra; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
20 | ||
21 | /* Structure maintained on a per-route basis. */ | |
22 | struct bgp_damp_info | |
23 | { | |
24 | /* Doubly linked list. This information must be linked to | |
25 | reuse_list or no_reuse_list. */ | |
26 | struct bgp_damp_info *next; | |
27 | struct bgp_damp_info *prev; | |
28 | ||
29 | /* Figure-of-merit. */ | |
30 | int penalty; | |
31 | ||
32 | /* Number of flapping. */ | |
33 | int flap; | |
34 | ||
35 | /* First flap time */ | |
36 | time_t start_time; | |
37 | ||
38 | /* Last time penalty was updated. */ | |
39 | time_t t_updated; | |
40 | ||
41 | /* Time of route start to be suppressed. */ | |
42 | time_t suppress_time; | |
43 | ||
44 | /* Back reference to bgp_info. */ | |
45 | struct bgp_info *binfo; | |
46 | ||
47 | /* Back reference to bgp_node. */ | |
48 | struct bgp_node *rn; | |
49 | ||
50 | /* Current index in the reuse_list. */ | |
51 | int index; | |
52 | ||
53 | /* Last time message type. */ | |
54 | u_char lastrecord; | |
55 | #define BGP_RECORD_UPDATE 1 | |
56 | #define BGP_RECORD_WITHDRAW 2 | |
57 | ||
58 | afi_t afi; | |
59 | safi_t safi; | |
60 | }; | |
61 | ||
62 | /* Specified parameter set configuration. */ | |
63 | struct bgp_damp_config | |
64 | { | |
65 | /* Value over which routes suppressed. */ | |
66 | int suppress_value; | |
67 | ||
68 | /* Value below which suppressed routes reused. */ | |
69 | int reuse_limit; | |
70 | ||
71 | /* Max time a route can be suppressed. */ | |
72 | int max_suppress_time; | |
73 | ||
74 | /* Time during which accumulated penalty reduces by half. */ | |
75 | int half_life; | |
76 | ||
77 | /* Non-configurable parameters but fixed at implementation time. | |
78 | * To change this values, init_bgp_damp() should be modified. | |
79 | */ | |
80 | int tmax; /* Max time previous instability retained */ | |
81 | int reuse_list_size; /* Number of reuse lists */ | |
82 | int reuse_index_size; /* Size of reuse index array */ | |
83 | ||
84 | /* Non-configurable parameters. Most of these are calculated from | |
85 | * the configurable parameters above. | |
86 | */ | |
87 | unsigned int ceiling; /* Max value a penalty can attain */ | |
88 | int decay_rate_per_tick; /* Calculated from half-life */ | |
89 | int decay_array_size; /* Calculated using config parameters */ | |
90 | double scale_factor; | |
91 | int reuse_scale_factor; | |
92 | ||
93 | /* Decay array per-set based. */ | |
94 | double *decay_array; | |
95 | ||
96 | /* Reuse index array per-set based. */ | |
97 | int *reuse_index; | |
98 | ||
99 | /* Reuse list array per-set based. */ | |
100 | struct bgp_damp_info **reuse_list; | |
101 | int reuse_offset; | |
102 | ||
103 | /* All dampening information which is not on reuse list. */ | |
104 | struct bgp_damp_info *no_reuse_list; | |
105 | ||
106 | /* Reuse timer thread per-set base. */ | |
107 | struct thread* t_reuse; | |
108 | }; | |
109 | ||
110 | #define BGP_DAMP_NONE 0 | |
111 | #define BGP_DAMP_USED 1 | |
112 | #define BGP_DAMP_SUPPRESSED 2 | |
113 | ||
114 | /* Time granularity for reuse lists */ | |
115 | #define DELTA_REUSE 10 | |
116 | ||
117 | /* Time granularity for decay arrays */ | |
118 | #define DELTA_T 5 | |
119 | ||
120 | #define DEFAULT_PENALTY 1000 | |
121 | ||
122 | #define DEFAULT_HALF_LIFE 15 | |
123 | #define DEFAULT_REUSE 750 | |
124 | #define DEFAULT_SUPPRESS 2000 | |
125 | ||
126 | #define REUSE_LIST_SIZE 256 | |
127 | #define REUSE_ARRAY_SIZE 1024 | |
128 | ||
129 | int bgp_damp_enable (struct bgp *, afi_t, safi_t, int, int, int, int); | |
130 | int bgp_damp_disable (struct bgp *, afi_t, safi_t); | |
131 | int bgp_damp_withdraw (struct bgp_info *, struct bgp_node *, | |
132 | afi_t, safi_t, int); | |
133 | int bgp_damp_update (struct bgp_info *, struct bgp_node *, afi_t, safi_t); | |
134 | int bgp_damp_scan (struct bgp_info *, afi_t, safi_t); | |
135 | void bgp_damp_info_free (struct bgp_damp_info *, int); | |
136 | void bgp_damp_info_clean (); | |
137 | char * bgp_get_reuse_time (int, char*, size_t); | |
138 | int bgp_damp_decay (time_t, int); | |
139 | int bgp_config_write_damp (struct vty *); | |
140 | void bgp_damp_info_vty (struct vty *, struct bgp_info *); | |
141 | char * bgp_damp_reuse_time_vty (struct vty *, struct bgp_info *); |