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718e3744 | 1 | /* BGP flap dampening |
896014f4 DL |
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 along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
718e3744 | 20 | |
21 | #include <zebra.h> | |
22 | #include <math.h> | |
23 | ||
24 | #include "prefix.h" | |
25 | #include "memory.h" | |
26 | #include "command.h" | |
27 | #include "log.h" | |
28 | #include "thread.h" | |
3f9c7369 | 29 | #include "queue.h" |
039f3a34 | 30 | #include "filter.h" |
718e3744 | 31 | |
32 | #include "bgpd/bgpd.h" | |
33 | #include "bgpd/bgp_damp.h" | |
34 | #include "bgpd/bgp_table.h" | |
35 | #include "bgpd/bgp_route.h" | |
d62a17ae | 36 | #include "bgpd/bgp_attr.h" |
718e3744 | 37 | #include "bgpd/bgp_advertise.h" |
3742de8d | 38 | #include "bgpd/bgp_vty.h" |
96f3485c | 39 | |
b4f7f45b IR |
40 | /* Global variable to access damping configuration */ |
41 | static struct bgp_damp_config damp[AFI_MAX][SAFI_MAX]; | |
718e3744 | 42 | |
b4f7f45b IR |
43 | /* Utility macro to add and delete BGP dampening information to no |
44 | used list. */ | |
45 | #define BGP_DAMP_LIST_ADD(N, A) BGP_PATH_INFO_ADD(N, A, no_reuse_list) | |
46 | #define BGP_DAMP_LIST_DEL(N, A) BGP_PATH_INFO_DEL(N, A, no_reuse_list) | |
6b0655a2 | 47 | |
718e3744 | 48 | /* Calculate reuse list index by penalty value. */ |
a935f597 | 49 | static int bgp_reuse_index(int penalty, struct bgp_damp_config *bdc) |
718e3744 | 50 | { |
d62a17ae | 51 | unsigned int i; |
b4f7f45b | 52 | int index; |
718e3744 | 53 | |
3ec5c500 DA |
54 | /* |
55 | * reuse_limit can't be zero, this is for Coverity | |
56 | * to bypass division by zero test. | |
57 | */ | |
58 | assert(bdc->reuse_limit); | |
59 | ||
a935f597 DA |
60 | i = (int)(((double)penalty / bdc->reuse_limit - 1.0) |
61 | * bdc->scale_factor); | |
718e3744 | 62 | |
a935f597 DA |
63 | if (i >= bdc->reuse_index_size) |
64 | i = bdc->reuse_index_size - 1; | |
718e3744 | 65 | |
a935f597 | 66 | index = bdc->reuse_index[i] - bdc->reuse_index[0]; |
d62a17ae | 67 | |
a935f597 | 68 | return (bdc->reuse_offset + index) % bdc->reuse_list_size; |
718e3744 | 69 | } |
70 | ||
71 | /* Add BGP dampening information to reuse list. */ | |
a935f597 DA |
72 | static void bgp_reuse_list_add(struct bgp_damp_info *bdi, |
73 | struct bgp_damp_config *bdc) | |
718e3744 | 74 | { |
b4f7f45b | 75 | int index; |
718e3744 | 76 | |
b4f7f45b | 77 | index = bdi->index = bgp_reuse_index(bdi->penalty, bdc); |
7ab05c74 | 78 | |
b4f7f45b IR |
79 | bdi->prev = NULL; |
80 | bdi->next = bdc->reuse_list[index]; | |
81 | if (bdc->reuse_list[index]) | |
82 | bdc->reuse_list[index]->prev = bdi; | |
83 | bdc->reuse_list[index] = bdi; | |
40ec3340 DS |
84 | } |
85 | ||
b4f7f45b IR |
86 | /* Delete BGP dampening information from reuse list. */ |
87 | static void bgp_reuse_list_delete(struct bgp_damp_info *bdi, | |
40ec3340 DS |
88 | struct bgp_damp_config *bdc) |
89 | { | |
b4f7f45b IR |
90 | if (bdi->next) |
91 | bdi->next->prev = bdi->prev; | |
92 | if (bdi->prev) | |
93 | bdi->prev->next = bdi->next; | |
94 | else | |
95 | bdc->reuse_list[bdi->index] = bdi->next; | |
d62a17ae | 96 | } |
6b0655a2 | 97 | |
718e3744 | 98 | /* Return decayed penalty value. */ |
a935f597 | 99 | int bgp_damp_decay(time_t tdiff, int penalty, struct bgp_damp_config *bdc) |
718e3744 | 100 | { |
d62a17ae | 101 | unsigned int i; |
102 | ||
103 | i = (int)((double)tdiff / DELTA_T); | |
718e3744 | 104 | |
d62a17ae | 105 | if (i == 0) |
106 | return penalty; | |
718e3744 | 107 | |
a935f597 | 108 | if (i >= bdc->decay_array_size) |
d62a17ae | 109 | return 0; |
718e3744 | 110 | |
a935f597 | 111 | return (int)(penalty * bdc->decay_array[i]); |
718e3744 | 112 | } |
113 | ||
114 | /* Handler of reuse timer event. Each route in the current reuse-list | |
115 | is evaluated. RFC2439 Section 4.8.7. */ | |
d62a17ae | 116 | static int bgp_reuse_timer(struct thread *t) |
718e3744 | 117 | { |
d62a17ae | 118 | struct bgp_damp_info *bdi; |
b4f7f45b | 119 | struct bgp_damp_info *next; |
d62a17ae | 120 | time_t t_now, t_diff; |
121 | ||
b4f7f45b IR |
122 | struct bgp_damp_config *bdc = THREAD_ARG(t); |
123 | ||
124 | bdc->t_reuse = NULL; | |
a935f597 DA |
125 | thread_add_timer(bm->master, bgp_reuse_timer, bdc, DELTA_REUSE, |
126 | &bdc->t_reuse); | |
d62a17ae | 127 | |
128 | t_now = bgp_clock(); | |
129 | ||
b4f7f45b IR |
130 | /* 1. save a pointer to the current zeroth queue head and zero the |
131 | list head entry. */ | |
132 | bdi = bdc->reuse_list[bdc->reuse_offset]; | |
133 | bdc->reuse_list[bdc->reuse_offset] = NULL; | |
d62a17ae | 134 | |
135 | /* 2. set offset = modulo reuse-list-size ( offset + 1 ), thereby | |
136 | rotating the circular queue of list-heads. */ | |
a935f597 | 137 | bdc->reuse_offset = (bdc->reuse_offset + 1) % bdc->reuse_list_size; |
d62a17ae | 138 | |
139 | /* 3. if ( the saved list head pointer is non-empty ) */ | |
b4f7f45b IR |
140 | for (; bdi; bdi = next) { |
141 | struct bgp *bgp = bdi->path->peer->bgp; | |
142 | ||
143 | next = bdi->next; | |
d62a17ae | 144 | |
145 | /* Set t-diff = t-now - t-updated. */ | |
146 | t_diff = t_now - bdi->t_updated; | |
147 | ||
148 | /* Set figure-of-merit = figure-of-merit * decay-array-ok | |
149 | * [t-diff] */ | |
a935f597 | 150 | bdi->penalty = bgp_damp_decay(t_diff, bdi->penalty, bdc); |
d62a17ae | 151 | |
152 | /* Set t-updated = t-now. */ | |
153 | bdi->t_updated = t_now; | |
154 | ||
155 | /* if (figure-of-merit < reuse). */ | |
a935f597 | 156 | if (bdi->penalty < bdc->reuse_limit) { |
d62a17ae | 157 | /* Reuse the route. */ |
9bcb3eef | 158 | bgp_path_info_unset_flag(bdi->dest, bdi->path, |
18ee8310 | 159 | BGP_PATH_DAMPED); |
d62a17ae | 160 | bdi->suppress_time = 0; |
161 | ||
162 | if (bdi->lastrecord == BGP_RECORD_UPDATE) { | |
9bcb3eef | 163 | bgp_path_info_unset_flag(bdi->dest, bdi->path, |
18ee8310 | 164 | BGP_PATH_HISTORY); |
b54892e0 | 165 | bgp_aggregate_increment( |
9bcb3eef | 166 | bgp, bgp_dest_get_prefix(bdi->dest), |
b54892e0 | 167 | bdi->path, bdi->afi, bdi->safi); |
9bcb3eef DS |
168 | bgp_process(bgp, bdi->dest, bdi->afi, |
169 | bdi->safi); | |
d62a17ae | 170 | } |
171 | ||
b4f7f45b IR |
172 | if (bdi->penalty <= bdc->reuse_limit / 2.0) |
173 | bgp_damp_info_free(bdi, 1, bdc->afi, bdc->safi); | |
174 | else | |
175 | BGP_DAMP_LIST_ADD(bdc, bdi); | |
176 | } else | |
d62a17ae | 177 | /* Re-insert into another list (See RFC2439 Section |
178 | * 4.8.6). */ | |
b4f7f45b | 179 | bgp_reuse_list_add(bdi, bdc); |
718e3744 | 180 | } |
718e3744 | 181 | |
d62a17ae | 182 | return 0; |
718e3744 | 183 | } |
184 | ||
185 | /* A route becomes unreachable (RFC2439 Section 4.8.2). */ | |
9bcb3eef | 186 | int bgp_damp_withdraw(struct bgp_path_info *path, struct bgp_dest *dest, |
4b7e6066 | 187 | afi_t afi, safi_t safi, int attr_change) |
718e3744 | 188 | { |
d62a17ae | 189 | time_t t_now; |
190 | struct bgp_damp_info *bdi = NULL; | |
3cf7af1d | 191 | unsigned int last_penalty = 0; |
b4f7f45b | 192 | struct bgp_damp_config *bdc = &damp[afi][safi]; |
d62a17ae | 193 | |
40ec3340 | 194 | t_now = bgp_clock(); |
b4f7f45b | 195 | |
d62a17ae | 196 | /* Processing Unreachable Messages. */ |
9b6d8fcf DS |
197 | if (path->extra) |
198 | bdi = path->extra->damp_info; | |
d62a17ae | 199 | |
200 | if (bdi == NULL) { | |
201 | /* If there is no previous stability history. */ | |
202 | ||
203 | /* RFC2439 said: | |
204 | 1. allocate a damping structure. | |
205 | 2. set figure-of-merit = 1. | |
206 | 3. withdraw the route. */ | |
207 | ||
208 | bdi = XCALLOC(MTYPE_BGP_DAMP_INFO, | |
209 | sizeof(struct bgp_damp_info)); | |
9b6d8fcf | 210 | bdi->path = path; |
9bcb3eef | 211 | bdi->dest = dest; |
d62a17ae | 212 | bdi->penalty = |
213 | (attr_change ? DEFAULT_PENALTY / 2 : DEFAULT_PENALTY); | |
214 | bdi->flap = 1; | |
215 | bdi->start_time = t_now; | |
216 | bdi->suppress_time = 0; | |
b4f7f45b | 217 | bdi->index = -1; |
d62a17ae | 218 | bdi->afi = afi; |
219 | bdi->safi = safi; | |
9b6d8fcf | 220 | (bgp_path_info_extra_get(path))->damp_info = bdi; |
b4f7f45b | 221 | BGP_DAMP_LIST_ADD(bdc, bdi); |
d62a17ae | 222 | } else { |
223 | last_penalty = bdi->penalty; | |
224 | ||
225 | /* 1. Set t-diff = t-now - t-updated. */ | |
a935f597 DA |
226 | bdi->penalty = (bgp_damp_decay(t_now - bdi->t_updated, |
227 | bdi->penalty, bdc) | |
228 | + (attr_change ? DEFAULT_PENALTY / 2 | |
229 | : DEFAULT_PENALTY)); | |
d62a17ae | 230 | |
a935f597 DA |
231 | if (bdi->penalty > bdc->ceiling) |
232 | bdi->penalty = bdc->ceiling; | |
d62a17ae | 233 | |
234 | bdi->flap++; | |
235 | } | |
236 | ||
9bcb3eef | 237 | assert((dest == bdi->dest) && (path == bdi->path)); |
d62a17ae | 238 | |
239 | bdi->lastrecord = BGP_RECORD_WITHDRAW; | |
240 | bdi->t_updated = t_now; | |
241 | ||
242 | /* Make this route as historical status. */ | |
9bcb3eef | 243 | bgp_path_info_set_flag(dest, path, BGP_PATH_HISTORY); |
d62a17ae | 244 | |
245 | /* Remove the route from a reuse list if it is on one. */ | |
9b6d8fcf | 246 | if (CHECK_FLAG(bdi->path->flags, BGP_PATH_DAMPED)) { |
d62a17ae | 247 | /* If decay rate isn't equal to 0, reinsert brn. */ |
b4f7f45b | 248 | if (bdi->penalty != last_penalty && bdi->index >= 0) { |
7ab05c74 | 249 | bgp_reuse_list_delete(bdi, bdc); |
a935f597 | 250 | bgp_reuse_list_add(bdi, bdc); |
d62a17ae | 251 | } |
252 | return BGP_DAMP_SUPPRESSED; | |
718e3744 | 253 | } |
d62a17ae | 254 | |
255 | /* If not suppressed before, do annonunce this withdraw and | |
256 | insert into reuse_list. */ | |
a935f597 | 257 | if (bdi->penalty >= bdc->suppress_value) { |
9bcb3eef | 258 | bgp_path_info_set_flag(dest, path, BGP_PATH_DAMPED); |
d62a17ae | 259 | bdi->suppress_time = t_now; |
b4f7f45b | 260 | BGP_DAMP_LIST_DEL(bdc, bdi); |
a935f597 | 261 | bgp_reuse_list_add(bdi, bdc); |
d62a17ae | 262 | } |
b4f7f45b | 263 | |
d62a17ae | 264 | return BGP_DAMP_USED; |
718e3744 | 265 | } |
266 | ||
9bcb3eef DS |
267 | int bgp_damp_update(struct bgp_path_info *path, struct bgp_dest *dest, |
268 | afi_t afi, safi_t safi) | |
718e3744 | 269 | { |
d62a17ae | 270 | time_t t_now; |
271 | struct bgp_damp_info *bdi; | |
272 | int status; | |
b4f7f45b | 273 | struct bgp_damp_config *bdc = &damp[afi][safi]; |
d62a17ae | 274 | |
9b6d8fcf | 275 | if (!path->extra || !((bdi = path->extra->damp_info))) |
d62a17ae | 276 | return BGP_DAMP_USED; |
277 | ||
278 | t_now = bgp_clock(); | |
9bcb3eef | 279 | bgp_path_info_unset_flag(dest, path, BGP_PATH_HISTORY); |
d62a17ae | 280 | |
281 | bdi->lastrecord = BGP_RECORD_UPDATE; | |
a935f597 DA |
282 | bdi->penalty = |
283 | bgp_damp_decay(t_now - bdi->t_updated, bdi->penalty, bdc); | |
d62a17ae | 284 | |
9b6d8fcf | 285 | if (!CHECK_FLAG(bdi->path->flags, BGP_PATH_DAMPED) |
a935f597 | 286 | && (bdi->penalty < bdc->suppress_value)) |
d62a17ae | 287 | status = BGP_DAMP_USED; |
9b6d8fcf | 288 | else if (CHECK_FLAG(bdi->path->flags, BGP_PATH_DAMPED) |
a935f597 | 289 | && (bdi->penalty < bdc->reuse_limit)) { |
9bcb3eef | 290 | bgp_path_info_unset_flag(dest, path, BGP_PATH_DAMPED); |
7ab05c74 | 291 | bgp_reuse_list_delete(bdi, bdc); |
b4f7f45b | 292 | BGP_DAMP_LIST_ADD(bdc, bdi); |
d62a17ae | 293 | bdi->suppress_time = 0; |
294 | status = BGP_DAMP_USED; | |
295 | } else | |
296 | status = BGP_DAMP_SUPPRESSED; | |
297 | ||
a935f597 | 298 | if (bdi->penalty > bdc->reuse_limit / 2.0) |
d62a17ae | 299 | bdi->t_updated = t_now; |
b4f7f45b IR |
300 | else |
301 | bgp_damp_info_free(bdi, 0, afi, safi); | |
d62a17ae | 302 | |
303 | return status; | |
718e3744 | 304 | } |
305 | ||
b4f7f45b IR |
306 | void bgp_damp_info_free(struct bgp_damp_info *bdi, int withdraw, afi_t afi, |
307 | safi_t safi) | |
718e3744 | 308 | { |
b4f7f45b IR |
309 | struct bgp_path_info *path; |
310 | struct bgp_damp_config *bdc = &damp[afi][safi]; | |
d62a17ae | 311 | |
b4f7f45b | 312 | if (!bdi) |
d8e49624 | 313 | return; |
d8e49624 | 314 | |
b4f7f45b IR |
315 | path = bdi->path; |
316 | path->extra->damp_info = NULL; | |
317 | ||
318 | if (CHECK_FLAG(path->flags, BGP_PATH_DAMPED)) | |
319 | bgp_reuse_list_delete(bdi, bdc); | |
320 | else | |
321 | BGP_DAMP_LIST_DEL(bdc, bdi); | |
322 | ||
323 | bgp_path_info_unset_flag(bdi->dest, path, | |
18ee8310 | 324 | BGP_PATH_HISTORY | BGP_PATH_DAMPED); |
b4f7f45b IR |
325 | |
326 | if (bdi->lastrecord == BGP_RECORD_WITHDRAW && withdraw) | |
327 | bgp_path_info_delete(bdi->dest, path); | |
328 | ||
329 | XFREE(MTYPE_BGP_DAMP_INFO, bdi); | |
718e3744 | 330 | } |
331 | ||
a935f597 DA |
332 | static void bgp_damp_parameter_set(int hlife, int reuse, int sup, int maxsup, |
333 | struct bgp_damp_config *bdc) | |
718e3744 | 334 | { |
d62a17ae | 335 | double reuse_max_ratio; |
336 | unsigned int i; | |
337 | double j; | |
338 | ||
a935f597 DA |
339 | bdc->suppress_value = sup; |
340 | bdc->half_life = hlife; | |
341 | bdc->reuse_limit = reuse; | |
342 | bdc->max_suppress_time = maxsup; | |
d62a17ae | 343 | |
344 | /* Initialize params per bgp_damp_config. */ | |
a935f597 | 345 | bdc->reuse_index_size = REUSE_ARRAY_SIZE; |
d62a17ae | 346 | |
a935f597 DA |
347 | bdc->ceiling = (int)(bdc->reuse_limit |
348 | * (pow(2, (double)bdc->max_suppress_time | |
349 | / bdc->half_life))); | |
d62a17ae | 350 | |
351 | /* Decay-array computations */ | |
a935f597 DA |
352 | bdc->decay_array_size = ceil((double)bdc->max_suppress_time / DELTA_T); |
353 | bdc->decay_array = XMALLOC(MTYPE_BGP_DAMP_ARRAY, | |
354 | sizeof(double) * (bdc->decay_array_size)); | |
355 | bdc->decay_array[0] = 1.0; | |
356 | bdc->decay_array[1] = | |
357 | exp((1.0 / ((double)bdc->half_life / DELTA_T)) * log(0.5)); | |
d62a17ae | 358 | |
359 | /* Calculate decay values for all possible times */ | |
a935f597 DA |
360 | for (i = 2; i < bdc->decay_array_size; i++) |
361 | bdc->decay_array[i] = | |
362 | bdc->decay_array[i - 1] * bdc->decay_array[1]; | |
d62a17ae | 363 | |
364 | /* Reuse-list computations */ | |
a935f597 | 365 | i = ceil((double)bdc->max_suppress_time / DELTA_REUSE) + 1; |
d62a17ae | 366 | if (i > REUSE_LIST_SIZE || i == 0) |
367 | i = REUSE_LIST_SIZE; | |
a935f597 | 368 | bdc->reuse_list_size = i; |
d62a17ae | 369 | |
a935f597 DA |
370 | bdc->reuse_list = |
371 | XCALLOC(MTYPE_BGP_DAMP_ARRAY, | |
b4f7f45b IR |
372 | bdc->reuse_list_size * sizeof(struct bgp_reuse_node *)); |
373 | ||
d62a17ae | 374 | /* Reuse-array computations */ |
a935f597 DA |
375 | bdc->reuse_index = XCALLOC(MTYPE_BGP_DAMP_ARRAY, |
376 | sizeof(int) * bdc->reuse_index_size); | |
d62a17ae | 377 | |
a935f597 DA |
378 | reuse_max_ratio = (double)bdc->ceiling / bdc->reuse_limit; |
379 | j = (exp((double)bdc->max_suppress_time / bdc->half_life) * log10(2.0)); | |
d62a17ae | 380 | if (reuse_max_ratio > j && j != 0) |
381 | reuse_max_ratio = j; | |
382 | ||
a935f597 DA |
383 | bdc->scale_factor = |
384 | (double)bdc->reuse_index_size / (reuse_max_ratio - 1); | |
d62a17ae | 385 | |
a935f597 DA |
386 | for (i = 0; i < bdc->reuse_index_size; i++) { |
387 | bdc->reuse_index[i] = | |
388 | (int)(((double)bdc->half_life / DELTA_REUSE) | |
389 | * log10(1.0 | |
390 | / (bdc->reuse_limit | |
391 | * (1.0 | |
392 | + ((double)i / bdc->scale_factor)))) | |
d62a17ae | 393 | / log10(0.5)); |
394 | } | |
718e3744 | 395 | } |
396 | ||
d62a17ae | 397 | int bgp_damp_enable(struct bgp *bgp, afi_t afi, safi_t safi, time_t half, |
398 | unsigned int reuse, unsigned int suppress, time_t max) | |
718e3744 | 399 | { |
b4f7f45b | 400 | struct bgp_damp_config *bdc = &damp[afi][safi]; |
a935f597 | 401 | |
d62a17ae | 402 | if (CHECK_FLAG(bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING)) { |
a935f597 DA |
403 | if (bdc->half_life == half && bdc->reuse_limit == reuse |
404 | && bdc->suppress_value == suppress | |
405 | && bdc->max_suppress_time == max) | |
d62a17ae | 406 | return 0; |
407 | bgp_damp_disable(bgp, afi, safi); | |
408 | } | |
718e3744 | 409 | |
d62a17ae | 410 | SET_FLAG(bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING); |
a935f597 | 411 | bgp_damp_parameter_set(half, reuse, suppress, max, bdc); |
718e3744 | 412 | |
d62a17ae | 413 | /* Register reuse timer. */ |
a935f597 DA |
414 | thread_add_timer(bm->master, bgp_reuse_timer, bdc, DELTA_REUSE, |
415 | &bdc->t_reuse); | |
718e3744 | 416 | |
d62a17ae | 417 | return 0; |
718e3744 | 418 | } |
419 | ||
b4f7f45b | 420 | static void bgp_damp_config_clean(struct bgp_damp_config *bdc) |
718e3744 | 421 | { |
d62a17ae | 422 | /* Free decay array */ |
a935f597 DA |
423 | XFREE(MTYPE_BGP_DAMP_ARRAY, bdc->decay_array); |
424 | bdc->decay_array_size = 0; | |
718e3744 | 425 | |
d62a17ae | 426 | /* Free reuse index array */ |
a935f597 DA |
427 | XFREE(MTYPE_BGP_DAMP_ARRAY, bdc->reuse_index); |
428 | bdc->reuse_index_size = 0; | |
718e3744 | 429 | |
aa95cf73 | 430 | /* Free reuse list array. */ |
a935f597 DA |
431 | XFREE(MTYPE_BGP_DAMP_ARRAY, bdc->reuse_list); |
432 | bdc->reuse_list_size = 0; | |
718e3744 | 433 | } |
434 | ||
b4f7f45b IR |
435 | /* Clean all the bgp_damp_info stored in reuse_list. */ |
436 | void bgp_damp_info_clean(afi_t afi, safi_t safi) | |
718e3744 | 437 | { |
b4f7f45b IR |
438 | unsigned int i; |
439 | struct bgp_damp_info *bdi, *next; | |
440 | struct bgp_damp_config *bdc = &damp[afi][safi]; | |
40ec3340 | 441 | |
b4f7f45b IR |
442 | bdc->reuse_offset = 0; |
443 | ||
444 | for (i = 0; i < bdc->reuse_list_size; i++) { | |
445 | if (!bdc->reuse_list[i]) | |
446 | continue; | |
447 | ||
448 | for (bdi = bdc->reuse_list[i]; bdi; bdi = next) { | |
449 | next = bdi->next; | |
450 | bgp_damp_info_free(bdi, 1, afi, safi); | |
451 | } | |
452 | bdc->reuse_list[i] = NULL; | |
453 | } | |
454 | ||
455 | for (bdi = bdc->no_reuse_list; bdi; bdi = next) { | |
456 | next = bdi->next; | |
457 | bgp_damp_info_free(bdi, 1, afi, safi); | |
458 | } | |
459 | bdc->no_reuse_list = NULL; | |
460 | } | |
40ec3340 | 461 | |
b4f7f45b IR |
462 | int bgp_damp_disable(struct bgp *bgp, afi_t afi, safi_t safi) |
463 | { | |
464 | struct bgp_damp_config *bdc = &damp[afi][safi]; | |
d62a17ae | 465 | /* If it wasn't enabled, there's nothing to do. */ |
466 | if (!CHECK_FLAG(bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING)) | |
467 | return 0; | |
fa4094ac | 468 | |
b3d6bc6e | 469 | /* Cancel reuse event. */ |
b4f7f45b | 470 | thread_cancel(&(bdc->t_reuse)); |
718e3744 | 471 | |
d62a17ae | 472 | /* Clean BGP dampening information. */ |
b4f7f45b | 473 | bgp_damp_info_clean(afi, safi); |
718e3744 | 474 | |
b4f7f45b IR |
475 | /* Clear configuration */ |
476 | bgp_damp_config_clean(bdc); | |
40ec3340 | 477 | |
b4f7f45b | 478 | UNSET_FLAG(bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING); |
d62a17ae | 479 | return 0; |
718e3744 | 480 | } |
481 | ||
b4f7f45b | 482 | void bgp_config_write_damp(struct vty *vty, afi_t afi, safi_t safi) |
718e3744 | 483 | { |
b4f7f45b IR |
484 | if (damp[afi][safi].half_life == DEFAULT_HALF_LIFE * 60 |
485 | && damp[afi][safi].reuse_limit == DEFAULT_REUSE | |
486 | && damp[afi][safi].suppress_value == DEFAULT_SUPPRESS | |
487 | && damp[afi][safi].max_suppress_time | |
488 | == damp[afi][safi].half_life * 4) | |
a935f597 | 489 | vty_out(vty, " bgp dampening\n"); |
b4f7f45b IR |
490 | else if (damp[afi][safi].half_life != DEFAULT_HALF_LIFE * 60 |
491 | && damp[afi][safi].reuse_limit == DEFAULT_REUSE | |
492 | && damp[afi][safi].suppress_value == DEFAULT_SUPPRESS | |
493 | && damp[afi][safi].max_suppress_time | |
494 | == damp[afi][safi].half_life * 4) | |
495 | vty_out(vty, " bgp dampening %lld\n", | |
496 | damp[afi][safi].half_life / 60LL); | |
d62a17ae | 497 | else |
a935f597 | 498 | vty_out(vty, " bgp dampening %lld %d %d %lld\n", |
b4f7f45b IR |
499 | damp[afi][safi].half_life / 60LL, |
500 | damp[afi][safi].reuse_limit, | |
501 | damp[afi][safi].suppress_value, | |
502 | damp[afi][safi].max_suppress_time / 60LL); | |
718e3744 | 503 | } |
504 | ||
b4f7f45b IR |
505 | static const char *bgp_get_reuse_time(unsigned int penalty, char *buf, |
506 | size_t len, afi_t afi, safi_t safi, | |
507 | bool use_json, json_object *json) | |
718e3744 | 508 | { |
d62a17ae | 509 | time_t reuse_time = 0; |
a2700b50 | 510 | struct tm tm; |
d62a17ae | 511 | int time_store = 0; |
718e3744 | 512 | |
b4f7f45b | 513 | if (penalty > damp[afi][safi].reuse_limit) { |
d62a17ae | 514 | reuse_time = (int)(DELTA_T |
b4f7f45b IR |
515 | * ((log((double)damp[afi][safi].reuse_limit |
516 | / penalty)) | |
517 | / (log(damp[afi][safi].decay_array[1])))); | |
718e3744 | 518 | |
b4f7f45b IR |
519 | if (reuse_time > damp[afi][safi].max_suppress_time) |
520 | reuse_time = damp[afi][safi].max_suppress_time; | |
718e3744 | 521 | |
a2700b50 | 522 | gmtime_r(&reuse_time, &tm); |
d62a17ae | 523 | } else |
524 | reuse_time = 0; | |
718e3744 | 525 | |
996c9314 | 526 | /* Making formatted timer strings. */ |
d62a17ae | 527 | if (reuse_time == 0) { |
528 | if (use_json) | |
529 | json_object_int_add(json, "reuseTimerMsecs", 0); | |
530 | else | |
531 | snprintf(buf, len, "00:00:00"); | |
532 | } else if (reuse_time < ONE_DAY_SECOND) { | |
533 | if (use_json) { | |
a2700b50 MS |
534 | time_store = (3600000 * tm.tm_hour) |
535 | + (60000 * tm.tm_min) | |
536 | + (1000 * tm.tm_sec); | |
d62a17ae | 537 | json_object_int_add(json, "reuseTimerMsecs", |
538 | time_store); | |
539 | } else | |
a2700b50 MS |
540 | snprintf(buf, len, "%02d:%02d:%02d", tm.tm_hour, |
541 | tm.tm_min, tm.tm_sec); | |
d62a17ae | 542 | } else if (reuse_time < ONE_WEEK_SECOND) { |
543 | if (use_json) { | |
a2700b50 MS |
544 | time_store = (86400000 * tm.tm_yday) |
545 | + (3600000 * tm.tm_hour) | |
546 | + (60000 * tm.tm_min) | |
547 | + (1000 * tm.tm_sec); | |
d62a17ae | 548 | json_object_int_add(json, "reuseTimerMsecs", |
549 | time_store); | |
550 | } else | |
a2700b50 MS |
551 | snprintf(buf, len, "%dd%02dh%02dm", tm.tm_yday, |
552 | tm.tm_hour, tm.tm_min); | |
d62a17ae | 553 | } else { |
554 | if (use_json) { | |
555 | time_store = | |
a2700b50 | 556 | (604800000 * tm.tm_yday / 7) |
d62a17ae | 557 | + (86400000 |
a2700b50 MS |
558 | * (tm.tm_yday - ((tm.tm_yday / 7) * 7))) |
559 | + (3600000 * tm.tm_hour) + (60000 * tm.tm_min) | |
560 | + (1000 * tm.tm_sec); | |
d62a17ae | 561 | json_object_int_add(json, "reuseTimerMsecs", |
562 | time_store); | |
563 | } else | |
a2700b50 MS |
564 | snprintf(buf, len, "%02dw%dd%02dh", tm.tm_yday / 7, |
565 | tm.tm_yday - ((tm.tm_yday / 7) * 7), | |
566 | tm.tm_hour); | |
d62a17ae | 567 | } |
568 | ||
569 | return buf; | |
718e3744 | 570 | } |
d62a17ae | 571 | |
b4f7f45b IR |
572 | void bgp_damp_info_vty(struct vty *vty, struct bgp_path_info *path, afi_t afi, |
573 | safi_t safi, json_object *json_path) | |
718e3744 | 574 | { |
d62a17ae | 575 | struct bgp_damp_info *bdi; |
576 | time_t t_now, t_diff; | |
577 | char timebuf[BGP_UPTIME_LEN]; | |
578 | int penalty; | |
b4f7f45b | 579 | struct bgp_damp_config *bdc = &damp[afi][safi]; |
d62a17ae | 580 | |
9b6d8fcf | 581 | if (!path->extra) |
d62a17ae | 582 | return; |
583 | ||
584 | /* BGP dampening information. */ | |
9b6d8fcf | 585 | bdi = path->extra->damp_info; |
d62a17ae | 586 | |
587 | /* If dampening is not enabled or there is no dampening information, | |
588 | return immediately. */ | |
a935f597 | 589 | if (!bdc || !bdi) |
d62a17ae | 590 | return; |
591 | ||
592 | /* Calculate new penalty. */ | |
593 | t_now = bgp_clock(); | |
594 | t_diff = t_now - bdi->t_updated; | |
a935f597 | 595 | penalty = bgp_damp_decay(t_diff, bdi->penalty, bdc); |
d62a17ae | 596 | |
597 | if (json_path) { | |
598 | json_object_int_add(json_path, "dampeningPenalty", penalty); | |
599 | json_object_int_add(json_path, "dampeningFlapCount", bdi->flap); | |
600 | peer_uptime(bdi->start_time, timebuf, BGP_UPTIME_LEN, 1, | |
601 | json_path); | |
602 | ||
9b6d8fcf DS |
603 | if (CHECK_FLAG(path->flags, BGP_PATH_DAMPED) |
604 | && !CHECK_FLAG(path->flags, BGP_PATH_HISTORY)) | |
b4f7f45b IR |
605 | bgp_get_reuse_time(penalty, timebuf, BGP_UPTIME_LEN, |
606 | afi, safi, 1, json_path); | |
d62a17ae | 607 | } else { |
608 | vty_out(vty, | |
609 | " Dampinfo: penalty %d, flapped %d times in %s", | |
610 | penalty, bdi->flap, | |
611 | peer_uptime(bdi->start_time, timebuf, BGP_UPTIME_LEN, 0, | |
612 | json_path)); | |
613 | ||
9b6d8fcf DS |
614 | if (CHECK_FLAG(path->flags, BGP_PATH_DAMPED) |
615 | && !CHECK_FLAG(path->flags, BGP_PATH_HISTORY)) | |
d62a17ae | 616 | vty_out(vty, ", reuse in %s", |
b4f7f45b IR |
617 | bgp_get_reuse_time(penalty, timebuf, |
618 | BGP_UPTIME_LEN, afi, safi, 0, | |
d62a17ae | 619 | json_path)); |
620 | ||
621 | vty_out(vty, "\n"); | |
622 | } | |
718e3744 | 623 | } |
624 | ||
9b6d8fcf | 625 | const char *bgp_damp_reuse_time_vty(struct vty *vty, struct bgp_path_info *path, |
a935f597 DA |
626 | char *timebuf, size_t len, afi_t afi, |
627 | safi_t safi, bool use_json, | |
d62a17ae | 628 | json_object *json) |
718e3744 | 629 | { |
d62a17ae | 630 | struct bgp_damp_info *bdi; |
631 | time_t t_now, t_diff; | |
632 | int penalty; | |
b4f7f45b | 633 | struct bgp_damp_config *bdc = &damp[afi][safi]; |
d62a17ae | 634 | |
9b6d8fcf | 635 | if (!path->extra) |
d62a17ae | 636 | return NULL; |
637 | ||
638 | /* BGP dampening information. */ | |
9b6d8fcf | 639 | bdi = path->extra->damp_info; |
d62a17ae | 640 | |
641 | /* If dampening is not enabled or there is no dampening information, | |
642 | return immediately. */ | |
3d20a370 | 643 | if (!bdc || !bdi) |
d62a17ae | 644 | return NULL; |
645 | ||
646 | /* Calculate new penalty. */ | |
647 | t_now = bgp_clock(); | |
648 | t_diff = t_now - bdi->t_updated; | |
a935f597 | 649 | penalty = bgp_damp_decay(t_diff, bdi->penalty, bdc); |
d62a17ae | 650 | |
b4f7f45b IR |
651 | return bgp_get_reuse_time(penalty, timebuf, len, afi, safi, use_json, |
652 | json); | |
718e3744 | 653 | } |
9914e022 | 654 | |
96f3485c MK |
655 | static int bgp_print_dampening_parameters(struct bgp *bgp, struct vty *vty, |
656 | afi_t afi, safi_t safi) | |
9914e022 | 657 | { |
d62a17ae | 658 | if (CHECK_FLAG(bgp->af_flags[afi][safi], BGP_CONFIG_DAMPENING)) { |
659 | vty_out(vty, "Half-life time: %lld min\n", | |
b4f7f45b IR |
660 | (long long)damp[afi][safi].half_life / 60); |
661 | vty_out(vty, "Reuse penalty: %d\n", | |
662 | damp[afi][safi].reuse_limit); | |
663 | vty_out(vty, "Suppress penalty: %d\n", | |
664 | damp[afi][safi].suppress_value); | |
d62a17ae | 665 | vty_out(vty, "Max suppress time: %lld min\n", |
b4f7f45b IR |
666 | (long long)damp[afi][safi].max_suppress_time / 60); |
667 | vty_out(vty, "Max suppress penalty: %u\n", | |
668 | damp[afi][safi].ceiling); | |
d62a17ae | 669 | vty_out(vty, "\n"); |
670 | } else | |
671 | vty_out(vty, "dampening not enabled for %s\n", | |
96f3485c MK |
672 | get_afi_safi_str(afi, safi, false)); |
673 | ||
674 | return CMD_SUCCESS; | |
675 | } | |
676 | ||
677 | int bgp_show_dampening_parameters(struct vty *vty, afi_t afi, safi_t safi, | |
96c81f66 | 678 | uint16_t show_flags) |
96f3485c MK |
679 | { |
680 | struct bgp *bgp; | |
40ec3340 | 681 | bgp = bgp_get_default(); |
b4f7f45b | 682 | |
96f3485c MK |
683 | if (bgp == NULL) { |
684 | vty_out(vty, "No BGP process is configured\n"); | |
685 | return CMD_WARNING; | |
686 | } | |
687 | ||
688 | if (!CHECK_FLAG(show_flags, BGP_SHOW_OPT_AFI_ALL)) | |
689 | return bgp_print_dampening_parameters(bgp, vty, afi, safi); | |
690 | ||
691 | if (CHECK_FLAG(show_flags, BGP_SHOW_OPT_AFI_IP) | |
692 | || CHECK_FLAG(show_flags, BGP_SHOW_OPT_AFI_IP6)) { | |
693 | afi = CHECK_FLAG(show_flags, BGP_SHOW_OPT_AFI_IP) ? AFI_IP | |
694 | : AFI_IP6; | |
695 | FOREACH_SAFI (safi) { | |
696 | if (strmatch(get_afi_safi_str(afi, safi, true), | |
697 | "Unknown")) | |
698 | continue; | |
d62a17ae | 699 | |
96f3485c MK |
700 | if (!CHECK_FLAG(show_flags, BGP_SHOW_OPT_JSON)) |
701 | vty_out(vty, "\nFor address family: %s\n\n", | |
702 | get_afi_safi_str(afi, safi, false)); | |
703 | ||
704 | bgp_print_dampening_parameters(bgp, vty, afi, safi); | |
705 | } | |
706 | } else { | |
707 | FOREACH_AFI_SAFI (afi, safi) { | |
708 | if (strmatch(get_afi_safi_str(afi, safi, true), | |
709 | "Unknown")) | |
710 | continue; | |
711 | ||
712 | if (!CHECK_FLAG(show_flags, BGP_SHOW_OPT_JSON)) | |
713 | vty_out(vty, "\nFor address family: %s\n", | |
714 | get_afi_safi_str(afi, safi, false)); | |
715 | ||
716 | bgp_print_dampening_parameters(bgp, vty, afi, safi); | |
717 | } | |
718 | } | |
d62a17ae | 719 | return CMD_SUCCESS; |
9914e022 | 720 | } |