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Merge pull request #10081 from ckishimo/ospf6d_type4
[mirror_frr.git] / bgpd / bgp_community.c
1 /* Community attribute related functions.
2 * Copyright (C) 1998, 2001 Kunihiro Ishiguro
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 */
20
21 #include <zebra.h>
22
23 #include "command.h"
24 #include "hash.h"
25 #include "memory.h"
26 #include "jhash.h"
27 #include "frrstr.h"
28
29 #include "bgpd/bgp_memory.h"
30 #include "bgpd/bgp_community.h"
31 #include "bgpd/bgp_community_alias.h"
32
33 /* Hash of community attribute. */
34 static struct hash *comhash;
35
36 /* Allocate a new communities value. */
37 static struct community *community_new(void)
38 {
39 return XCALLOC(MTYPE_COMMUNITY, sizeof(struct community));
40 }
41
42 /* Free communities value. */
43 void community_free(struct community **com)
44 {
45 if (!(*com))
46 return;
47
48 XFREE(MTYPE_COMMUNITY_VAL, (*com)->val);
49 XFREE(MTYPE_COMMUNITY_STR, (*com)->str);
50
51 if ((*com)->json) {
52 json_object_free((*com)->json);
53 (*com)->json = NULL;
54 }
55
56 XFREE(MTYPE_COMMUNITY, (*com));
57 }
58
59 /* Add one community value to the community. */
60 void community_add_val(struct community *com, uint32_t val)
61 {
62 com->size++;
63 com->val = XREALLOC(MTYPE_COMMUNITY_VAL, com->val, com_length(com));
64
65 val = htonl(val);
66 memcpy(com_lastval(com), &val, sizeof(uint32_t));
67 }
68
69 /* Delete one community. */
70 void community_del_val(struct community *com, uint32_t *val)
71 {
72 int i = 0;
73 int c = 0;
74
75 if (!com->val)
76 return;
77
78 while (i < com->size) {
79 if (memcmp(com->val + i, val, sizeof(uint32_t)) == 0) {
80 c = com->size - i - 1;
81
82 if (c > 0)
83 memmove(com->val + i, com->val + (i + 1),
84 c * sizeof(*val));
85
86 com->size--;
87
88 if (com->size > 0)
89 com->val = XREALLOC(MTYPE_COMMUNITY_VAL,
90 com->val, com_length(com));
91 else {
92 XFREE(MTYPE_COMMUNITY_VAL, com->val);
93 }
94 return;
95 }
96 i++;
97 }
98 }
99
100 /* Delete all communities listed in com2 from com1 */
101 struct community *community_delete(struct community *com1,
102 struct community *com2)
103 {
104 int i = 0;
105
106 while (i < com2->size) {
107 community_del_val(com1, com2->val + i);
108 i++;
109 }
110
111 return com1;
112 }
113
114 /* Callback function from qsort(). */
115 static int community_compare(const void *a1, const void *a2)
116 {
117 uint32_t v1;
118 uint32_t v2;
119
120 memcpy(&v1, a1, sizeof(uint32_t));
121 memcpy(&v2, a2, sizeof(uint32_t));
122 v1 = ntohl(v1);
123 v2 = ntohl(v2);
124
125 if (v1 < v2)
126 return -1;
127 if (v1 > v2)
128 return 1;
129 return 0;
130 }
131
132 bool community_include(struct community *com, uint32_t val)
133 {
134 int i;
135
136 val = htonl(val);
137
138 for (i = 0; i < com->size; i++)
139 if (memcmp(&val, com_nthval(com, i), sizeof(uint32_t)) == 0)
140 return true;
141 return false;
142 }
143
144 uint32_t community_val_get(struct community *com, int i)
145 {
146 uint8_t *p;
147 uint32_t val;
148
149 p = (uint8_t *)com->val;
150 p += (i * COMMUNITY_SIZE);
151
152 memcpy(&val, p, sizeof(uint32_t));
153
154 return ntohl(val);
155 }
156
157 /* Sort and uniq given community. */
158 struct community *community_uniq_sort(struct community *com)
159 {
160 int i;
161 struct community *new;
162 uint32_t val;
163
164 if (!com)
165 return NULL;
166
167 new = community_new();
168 new->json = NULL;
169
170 for (i = 0; i < com->size; i++) {
171 val = community_val_get(com, i);
172
173 if (!community_include(new, val))
174 community_add_val(new, val);
175 }
176
177 qsort(new->val, new->size, sizeof(uint32_t), community_compare);
178
179 return new;
180 }
181
182 /* Convert communities attribute to string.
183
184 For Well-known communities value, below keyword is used.
185
186 0x0 "internet"
187 0xFFFF0000 "graceful-shutdown"
188 0xFFFF0001 "accept-own"
189 0xFFFF0002 "route-filter-translated-v4"
190 0xFFFF0003 "route-filter-v4"
191 0xFFFF0004 "route-filter-translated-v6"
192 0xFFFF0005 "route-filter-v6"
193 0xFFFF0006 "llgr-stale"
194 0xFFFF0007 "no-llgr"
195 0xFFFF0008 "accept-own-nexthop"
196 0xFFFF029A "blackhole"
197 0xFFFFFF01 "no-export"
198 0xFFFFFF02 "no-advertise"
199 0xFFFFFF03 "local-AS"
200 0xFFFFFF04 "no-peer"
201
202 For other values, "AS:VAL" format is used. */
203 static void set_community_string(struct community *com, bool make_json)
204 {
205 int i;
206 char *str;
207 int len;
208 int first;
209 uint32_t comval;
210 uint16_t as;
211 uint16_t val;
212 json_object *json_community_list = NULL;
213 json_object *json_string = NULL;
214
215 if (!com)
216 return;
217
218 if (make_json) {
219 com->json = json_object_new_object();
220 json_community_list = json_object_new_array();
221 }
222
223 /* When communities attribute is empty. */
224 if (com->size == 0) {
225 str = XMALLOC(MTYPE_COMMUNITY_STR, 1);
226 str[0] = '\0';
227
228 if (make_json) {
229 json_object_string_add(com->json, "string", "");
230 json_object_object_add(com->json, "list",
231 json_community_list);
232 }
233 com->str = str;
234 return;
235 }
236
237 /* Memory allocation is time consuming work. So we calculate
238 required string length first. */
239 len = 0;
240
241 for (i = 0; i < com->size; i++) {
242 memcpy(&comval, com_nthval(com, i), sizeof(uint32_t));
243 comval = ntohl(comval);
244
245 switch (comval) {
246 case COMMUNITY_INTERNET:
247 len += strlen(" internet");
248 break;
249 case COMMUNITY_GSHUT:
250 len += strlen(" graceful-shutdown");
251 break;
252 case COMMUNITY_ACCEPT_OWN:
253 len += strlen(" accept-own");
254 break;
255 case COMMUNITY_ROUTE_FILTER_TRANSLATED_v4:
256 len += strlen(" route-filter-translated-v4");
257 break;
258 case COMMUNITY_ROUTE_FILTER_v4:
259 len += strlen(" route-filter-v4");
260 break;
261 case COMMUNITY_ROUTE_FILTER_TRANSLATED_v6:
262 len += strlen(" route-filter-translated-v6");
263 break;
264 case COMMUNITY_ROUTE_FILTER_v6:
265 len += strlen(" route-filter-v6");
266 break;
267 case COMMUNITY_LLGR_STALE:
268 len += strlen(" llgr-stale");
269 break;
270 case COMMUNITY_NO_LLGR:
271 len += strlen(" no-llgr");
272 break;
273 case COMMUNITY_ACCEPT_OWN_NEXTHOP:
274 len += strlen(" accept-own-nexthop");
275 break;
276 case COMMUNITY_BLACKHOLE:
277 len += strlen(" blackhole");
278 break;
279 case COMMUNITY_NO_EXPORT:
280 len += strlen(" no-export");
281 break;
282 case COMMUNITY_NO_ADVERTISE:
283 len += strlen(" no-advertise");
284 break;
285 case COMMUNITY_LOCAL_AS:
286 len += strlen(" local-AS");
287 break;
288 case COMMUNITY_NO_PEER:
289 len += strlen(" no-peer");
290 break;
291 default:
292 len = BUFSIZ;
293 break;
294 }
295 }
296
297 /* Allocate memory. */
298 str = XCALLOC(MTYPE_COMMUNITY_STR, len);
299 first = 1;
300
301 /* Fill in string. */
302 for (i = 0; i < com->size; i++) {
303 memcpy(&comval, com_nthval(com, i), sizeof(uint32_t));
304 comval = ntohl(comval);
305
306 if (first)
307 first = 0;
308 else
309 strlcat(str, " ", len);
310
311 switch (comval) {
312 case COMMUNITY_INTERNET:
313 strlcat(str, "internet", len);
314 if (make_json) {
315 json_string =
316 json_object_new_string("internet");
317 json_object_array_add(json_community_list,
318 json_string);
319 }
320 break;
321 case COMMUNITY_GSHUT:
322 strlcat(str, "graceful-shutdown", len);
323 if (make_json) {
324 json_string = json_object_new_string(
325 "gracefulShutdown");
326 json_object_array_add(json_community_list,
327 json_string);
328 }
329 break;
330 case COMMUNITY_ACCEPT_OWN:
331 strlcat(str, "accept-own", len);
332 if (make_json) {
333 json_string = json_object_new_string(
334 "acceptown");
335 json_object_array_add(json_community_list,
336 json_string);
337 }
338 break;
339 case COMMUNITY_ROUTE_FILTER_TRANSLATED_v4:
340 strlcat(str, "route-filter-translated-v4", len);
341 if (make_json) {
342 json_string = json_object_new_string(
343 "routeFilterTranslatedV4");
344 json_object_array_add(json_community_list,
345 json_string);
346 }
347 break;
348 case COMMUNITY_ROUTE_FILTER_v4:
349 strlcat(str, "route-filter-v4", len);
350 if (make_json) {
351 json_string = json_object_new_string(
352 "routeFilterV4");
353 json_object_array_add(json_community_list,
354 json_string);
355 }
356 break;
357 case COMMUNITY_ROUTE_FILTER_TRANSLATED_v6:
358 strlcat(str, "route-filter-translated-v6", len);
359 if (make_json) {
360 json_string = json_object_new_string(
361 "routeFilterTranslatedV6");
362 json_object_array_add(json_community_list,
363 json_string);
364 }
365 break;
366 case COMMUNITY_ROUTE_FILTER_v6:
367 strlcat(str, "route-filter-v6", len);
368 if (make_json) {
369 json_string = json_object_new_string(
370 "routeFilterV6");
371 json_object_array_add(json_community_list,
372 json_string);
373 }
374 break;
375 case COMMUNITY_LLGR_STALE:
376 strlcat(str, "llgr-stale", len);
377 if (make_json) {
378 json_string = json_object_new_string(
379 "llgrStale");
380 json_object_array_add(json_community_list,
381 json_string);
382 }
383 break;
384 case COMMUNITY_NO_LLGR:
385 strlcat(str, "no-llgr", len);
386 if (make_json) {
387 json_string = json_object_new_string(
388 "noLlgr");
389 json_object_array_add(json_community_list,
390 json_string);
391 }
392 break;
393 case COMMUNITY_ACCEPT_OWN_NEXTHOP:
394 strlcat(str, "accept-own-nexthop", len);
395 if (make_json) {
396 json_string = json_object_new_string(
397 "acceptownnexthop");
398 json_object_array_add(json_community_list,
399 json_string);
400 }
401 break;
402 case COMMUNITY_BLACKHOLE:
403 strlcat(str, "blackhole", len);
404 if (make_json) {
405 json_string = json_object_new_string(
406 "blackhole");
407 json_object_array_add(json_community_list,
408 json_string);
409 }
410 break;
411 case COMMUNITY_NO_EXPORT:
412 strlcat(str, "no-export", len);
413 if (make_json) {
414 json_string =
415 json_object_new_string("noExport");
416 json_object_array_add(json_community_list,
417 json_string);
418 }
419 break;
420 case COMMUNITY_NO_ADVERTISE:
421 strlcat(str, "no-advertise", len);
422 if (make_json) {
423 json_string =
424 json_object_new_string("noAdvertise");
425 json_object_array_add(json_community_list,
426 json_string);
427 }
428 break;
429 case COMMUNITY_LOCAL_AS:
430 strlcat(str, "local-AS", len);
431 if (make_json) {
432 json_string = json_object_new_string("localAs");
433 json_object_array_add(json_community_list,
434 json_string);
435 }
436 break;
437 case COMMUNITY_NO_PEER:
438 strlcat(str, "no-peer", len);
439 if (make_json) {
440 json_string = json_object_new_string("noPeer");
441 json_object_array_add(json_community_list,
442 json_string);
443 }
444 break;
445 default:
446 as = (comval >> 16) & 0xFFFF;
447 val = comval & 0xFFFF;
448 char buf[32];
449 snprintf(buf, sizeof(buf), "%u:%d", as, val);
450 const char *com2alias = bgp_community2alias(buf);
451
452 strlcat(str, com2alias, len);
453 if (make_json) {
454 json_string = json_object_new_string(com2alias);
455 json_object_array_add(json_community_list,
456 json_string);
457 }
458 break;
459 }
460 }
461
462 if (make_json) {
463 json_object_string_add(com->json, "string", str);
464 json_object_object_add(com->json, "list", json_community_list);
465 }
466 com->str = str;
467 }
468
469 /* Intern communities attribute. */
470 struct community *community_intern(struct community *com)
471 {
472 struct community *find;
473
474 /* Assert this community structure is not interned. */
475 assert(com->refcnt == 0);
476
477 /* Lookup community hash. */
478 find = (struct community *)hash_get(comhash, com, hash_alloc_intern);
479
480 /* Arguemnt com is allocated temporary. So when it is not used in
481 hash, it should be freed. */
482 if (find != com)
483 community_free(&com);
484
485 /* Increment refrence counter. */
486 find->refcnt++;
487
488 /* Make string. */
489 if (!find->str)
490 set_community_string(find, false);
491
492 return find;
493 }
494
495 /* Free community attribute. */
496 void community_unintern(struct community **com)
497 {
498 struct community *ret;
499
500 if ((*com)->refcnt)
501 (*com)->refcnt--;
502
503 /* Pull off from hash. */
504 if ((*com)->refcnt == 0) {
505 /* Community value com must exist in hash. */
506 ret = (struct community *)hash_release(comhash, *com);
507 assert(ret != NULL);
508
509 community_free(com);
510 }
511 }
512
513 /* Create new community attribute. */
514 struct community *community_parse(uint32_t *pnt, unsigned short length)
515 {
516 struct community tmp;
517 struct community *new;
518
519 /* If length is malformed return NULL. */
520 if (length % COMMUNITY_SIZE)
521 return NULL;
522
523 /* Make temporary community for hash look up. */
524 tmp.size = length / COMMUNITY_SIZE;
525 tmp.val = pnt;
526
527 new = community_uniq_sort(&tmp);
528
529 return community_intern(new);
530 }
531
532 struct community *community_dup(struct community *com)
533 {
534 struct community *new;
535
536 new = XCALLOC(MTYPE_COMMUNITY, sizeof(struct community));
537 new->size = com->size;
538 if (new->size) {
539 new->val = XMALLOC(MTYPE_COMMUNITY_VAL,
540 com->size * COMMUNITY_SIZE);
541 memcpy(new->val, com->val, com->size * COMMUNITY_SIZE);
542 } else
543 new->val = NULL;
544 return new;
545 }
546
547 /* Return string representation of communities attribute. */
548 char *community_str(struct community *com, bool make_json)
549 {
550 if (!com)
551 return NULL;
552
553 if (make_json && !com->json && com->str)
554 XFREE(MTYPE_COMMUNITY_STR, com->str);
555
556 if (!com->str)
557 set_community_string(com, make_json);
558 return com->str;
559 }
560
561 /* Make hash value of community attribute. This function is used by
562 hash package.*/
563 unsigned int community_hash_make(const struct community *com)
564 {
565 uint32_t *pnt = com->val;
566
567 return jhash2(pnt, com->size, 0x43ea96c1);
568 }
569
570 bool community_match(const struct community *com1, const struct community *com2)
571 {
572 int i = 0;
573 int j = 0;
574
575 if (com1 == NULL && com2 == NULL)
576 return true;
577
578 if (com1 == NULL || com2 == NULL)
579 return false;
580
581 if (com1->size < com2->size)
582 return false;
583
584 /* Every community on com2 needs to be on com1 for this to match */
585 while (i < com1->size && j < com2->size) {
586 if (memcmp(com1->val + i, com2->val + j, sizeof(uint32_t)) == 0)
587 j++;
588 i++;
589 }
590
591 if (j == com2->size)
592 return true;
593 else
594 return false;
595 }
596
597 bool community_cmp(const struct community *com1, const struct community *com2)
598 {
599 if (com1 == NULL && com2 == NULL)
600 return true;
601 if (com1 == NULL || com2 == NULL)
602 return false;
603
604 if (com1->size == com2->size)
605 if (memcmp(com1->val, com2->val, com1->size * COMMUNITY_SIZE)
606 == 0)
607 return true;
608 return false;
609 }
610
611 /* Add com2 to the end of com1. */
612 struct community *community_merge(struct community *com1,
613 struct community *com2)
614 {
615 com1->val = XREALLOC(MTYPE_COMMUNITY_VAL, com1->val,
616 (com1->size + com2->size) * COMMUNITY_SIZE);
617
618 memcpy(com1->val + com1->size, com2->val, com2->size * COMMUNITY_SIZE);
619 com1->size += com2->size;
620
621 return com1;
622 }
623
624 /* Community token enum. */
625 enum community_token {
626 community_token_val,
627 community_token_gshut,
628 community_token_accept_own,
629 community_token_route_filter_translated_v4,
630 community_token_route_filter_v4,
631 community_token_route_filter_translated_v6,
632 community_token_route_filter_v6,
633 community_token_llgr_stale,
634 community_token_no_llgr,
635 community_token_accept_own_nexthop,
636 community_token_blackhole,
637 community_token_no_export,
638 community_token_no_advertise,
639 community_token_local_as,
640 community_token_no_peer,
641 community_token_unknown
642 };
643
644 /* Helper to check if a given community is valid */
645 static bool community_valid(const char *community)
646 {
647 int octets = 0;
648 char **splits;
649 int num;
650 int invalid = 0;
651
652 frrstr_split(community, ":", &splits, &num);
653
654 for (int i = 0; i < num; i++) {
655 if (strtoul(splits[i], NULL, 10) > UINT16_MAX)
656 invalid++;
657
658 if (strlen(splits[i]) == 0)
659 invalid++;
660
661 octets++;
662 XFREE(MTYPE_TMP, splits[i]);
663 }
664 XFREE(MTYPE_TMP, splits);
665
666 return (octets < 2 || invalid) ? false : true;
667 }
668
669 /* Get next community token from string. */
670 static const char *
671 community_gettoken(const char *buf, enum community_token *token, uint32_t *val)
672 {
673 const char *p = buf;
674
675 /* Skip white space. */
676 while (isspace((unsigned char)*p))
677 p++;
678
679 /* Check the end of the line. */
680 if (*p == '\0')
681 return NULL;
682
683 /* Well known community string check. */
684 if (isalpha((unsigned char)*p)) {
685 if (strncmp(p, "internet", strlen("internet")) == 0) {
686 *val = COMMUNITY_INTERNET;
687 *token = community_token_no_export;
688 p += strlen("internet");
689 return p;
690 }
691 if (strncmp(p, "graceful-shutdown", strlen("graceful-shutdown"))
692 == 0) {
693 *val = COMMUNITY_GSHUT;
694 *token = community_token_gshut;
695 p += strlen("graceful-shutdown");
696 return p;
697 }
698 if (strncmp(p, "accept-own-nexthop",
699 strlen("accept-own-nexthop"))
700 == 0) {
701 *val = COMMUNITY_ACCEPT_OWN_NEXTHOP;
702 *token = community_token_accept_own_nexthop;
703 p += strlen("accept-own-nexthop");
704 return p;
705 }
706 if (strncmp(p, "accept-own", strlen("accept-own"))
707 == 0) {
708 *val = COMMUNITY_ACCEPT_OWN;
709 *token = community_token_accept_own;
710 p += strlen("accept-own");
711 return p;
712 }
713 if (strncmp(p, "route-filter-translated-v4",
714 strlen("route-filter-translated-v4"))
715 == 0) {
716 *val = COMMUNITY_ROUTE_FILTER_TRANSLATED_v4;
717 *token = community_token_route_filter_translated_v4;
718 p += strlen("route-filter-translated-v4");
719 return p;
720 }
721 if (strncmp(p, "route-filter-v4", strlen("route-filter-v4"))
722 == 0) {
723 *val = COMMUNITY_ROUTE_FILTER_v4;
724 *token = community_token_route_filter_v4;
725 p += strlen("route-filter-v4");
726 return p;
727 }
728 if (strncmp(p, "route-filter-translated-v6",
729 strlen("route-filter-translated-v6"))
730 == 0) {
731 *val = COMMUNITY_ROUTE_FILTER_TRANSLATED_v6;
732 *token = community_token_route_filter_translated_v6;
733 p += strlen("route-filter-translated-v6");
734 return p;
735 }
736 if (strncmp(p, "route-filter-v6", strlen("route-filter-v6"))
737 == 0) {
738 *val = COMMUNITY_ROUTE_FILTER_v6;
739 *token = community_token_route_filter_v6;
740 p += strlen("route-filter-v6");
741 return p;
742 }
743 if (strncmp(p, "llgr-stale", strlen("llgr-stale"))
744 == 0) {
745 *val = COMMUNITY_LLGR_STALE;
746 *token = community_token_llgr_stale;
747 p += strlen("llgr-stale");
748 return p;
749 }
750 if (strncmp(p, "no-llgr", strlen("no-llgr"))
751 == 0) {
752 *val = COMMUNITY_NO_LLGR;
753 *token = community_token_no_llgr;
754 p += strlen("no-llgr");
755 return p;
756 }
757 if (strncmp(p, "blackhole", strlen("blackhole"))
758 == 0) {
759 *val = COMMUNITY_BLACKHOLE;
760 *token = community_token_blackhole;
761 p += strlen("blackhole");
762 return p;
763 }
764 if (strncmp(p, "no-export", strlen("no-export")) == 0) {
765 *val = COMMUNITY_NO_EXPORT;
766 *token = community_token_no_export;
767 p += strlen("no-export");
768 return p;
769 }
770 if (strncmp(p, "no-advertise", strlen("no-advertise")) == 0) {
771 *val = COMMUNITY_NO_ADVERTISE;
772 *token = community_token_no_advertise;
773 p += strlen("no-advertise");
774 return p;
775 }
776 if (strncmp(p, "local-AS", strlen("local-AS")) == 0) {
777 *val = COMMUNITY_LOCAL_AS;
778 *token = community_token_local_as;
779 p += strlen("local-AS");
780 return p;
781 }
782 if (strncmp(p, "no-peer", strlen("no-peer")) == 0) {
783 *val = COMMUNITY_NO_PEER;
784 *token = community_token_no_peer;
785 p += strlen("no-peer");
786 return p;
787 }
788
789 /* Unknown string. */
790 *token = community_token_unknown;
791 return NULL;
792 }
793
794 /* Community value. */
795 if (isdigit((unsigned char)*p)) {
796 int separator = 0;
797 int digit = 0;
798 uint32_t community_low = 0;
799 uint32_t community_high = 0;
800
801 if (!community_valid(p)) {
802 *token = community_token_unknown;
803 return NULL;
804 }
805
806 while (isdigit((unsigned char)*p) || *p == ':') {
807 if (*p == ':') {
808 if (separator) {
809 *token = community_token_unknown;
810 return NULL;
811 } else {
812 separator = 1;
813 digit = 0;
814
815 if (community_low > UINT16_MAX) {
816 *token =
817 community_token_unknown;
818 return NULL;
819 }
820
821 community_high = community_low << 16;
822 community_low = 0;
823 }
824 } else {
825 digit = 1;
826 community_low *= 10;
827 community_low += (*p - '0');
828 }
829 p++;
830 }
831 if (!digit) {
832 *token = community_token_unknown;
833 return NULL;
834 }
835
836 *val = community_high + community_low;
837 *token = community_token_val;
838 return p;
839 }
840 *token = community_token_unknown;
841 return NULL;
842 }
843
844 /* convert string to community structure */
845 struct community *community_str2com(const char *str)
846 {
847 struct community *com = NULL;
848 struct community *com_sort = NULL;
849 uint32_t val = 0;
850 enum community_token token = community_token_unknown;
851
852 do {
853 str = community_gettoken(str, &token, &val);
854
855 switch (token) {
856 case community_token_val:
857 case community_token_gshut:
858 case community_token_accept_own:
859 case community_token_route_filter_translated_v4:
860 case community_token_route_filter_v4:
861 case community_token_route_filter_translated_v6:
862 case community_token_route_filter_v6:
863 case community_token_llgr_stale:
864 case community_token_no_llgr:
865 case community_token_accept_own_nexthop:
866 case community_token_blackhole:
867 case community_token_no_export:
868 case community_token_no_advertise:
869 case community_token_local_as:
870 case community_token_no_peer:
871 if (com == NULL) {
872 com = community_new();
873 com->json = NULL;
874 }
875 community_add_val(com, val);
876 break;
877 case community_token_unknown:
878 if (com)
879 community_free(&com);
880 return NULL;
881 }
882 } while (str);
883
884 com_sort = community_uniq_sort(com);
885 community_free(&com);
886
887 return com_sort;
888 }
889
890 /* Return communities hash entry count. */
891 unsigned long community_count(void)
892 {
893 return comhash->count;
894 }
895
896 /* Return communities hash. */
897 struct hash *community_hash(void)
898 {
899 return comhash;
900 }
901
902 /* Initialize comminity related hash. */
903 void community_init(void)
904 {
905 comhash =
906 hash_create((unsigned int (*)(const void *))community_hash_make,
907 (bool (*)(const void *, const void *))community_cmp,
908 "BGP Community Hash");
909 }
910
911 void community_finish(void)
912 {
913 hash_free(comhash);
914 comhash = NULL;
915 }
916
917 static struct community *bgp_aggr_community_lookup(
918 struct bgp_aggregate *aggregate,
919 struct community *community)
920 {
921 return hash_lookup(aggregate->community_hash, community);
922 }
923
924 static void *bgp_aggr_communty_hash_alloc(void *p)
925 {
926 struct community *ref = (struct community *)p;
927 struct community *community = NULL;
928
929 community = community_dup(ref);
930 return community;
931 }
932
933 static void bgp_aggr_community_prepare(struct hash_bucket *hb, void *arg)
934 {
935 struct community *hb_community = hb->data;
936 struct community **aggr_community = arg;
937
938 if (*aggr_community)
939 *aggr_community = community_merge(*aggr_community,
940 hb_community);
941 else
942 *aggr_community = community_dup(hb_community);
943 }
944
945 void bgp_aggr_community_remove(void *arg)
946 {
947 struct community *community = arg;
948
949 community_free(&community);
950 }
951
952 void bgp_compute_aggregate_community(struct bgp_aggregate *aggregate,
953 struct community *community)
954 {
955 bgp_compute_aggregate_community_hash(aggregate, community);
956 bgp_compute_aggregate_community_val(aggregate);
957 }
958
959
960 void bgp_compute_aggregate_community_hash(struct bgp_aggregate *aggregate,
961 struct community *community)
962 {
963 struct community *aggr_community = NULL;
964
965 if ((aggregate == NULL) || (community == NULL))
966 return;
967
968 /* Create hash if not already created.
969 */
970 if (aggregate->community_hash == NULL)
971 aggregate->community_hash = hash_create(
972 (unsigned int (*)(const void *))community_hash_make,
973 (bool (*)(const void *, const void *))community_cmp,
974 "BGP Aggregator community hash");
975
976 aggr_community = bgp_aggr_community_lookup(aggregate, community);
977 if (aggr_community == NULL) {
978 /* Insert community into hash.
979 */
980 aggr_community = hash_get(aggregate->community_hash, community,
981 bgp_aggr_communty_hash_alloc);
982 }
983
984 /* Increment reference counter.
985 */
986 aggr_community->refcnt++;
987 }
988
989 void bgp_compute_aggregate_community_val(struct bgp_aggregate *aggregate)
990 {
991 struct community *commerge = NULL;
992
993 if (aggregate == NULL)
994 return;
995
996 /* Re-compute aggregate's community.
997 */
998 if (aggregate->community)
999 community_free(&aggregate->community);
1000 if (aggregate->community_hash &&
1001 aggregate->community_hash->count) {
1002 hash_iterate(aggregate->community_hash,
1003 bgp_aggr_community_prepare,
1004 &aggregate->community);
1005 commerge = aggregate->community;
1006 aggregate->community = community_uniq_sort(commerge);
1007 if (commerge)
1008 community_free(&commerge);
1009 }
1010 }
1011
1012
1013
1014 void bgp_remove_community_from_aggregate(struct bgp_aggregate *aggregate,
1015 struct community *community)
1016 {
1017 struct community *aggr_community = NULL;
1018 struct community *ret_comm = NULL;
1019
1020 if ((!aggregate)
1021 || (!aggregate->community_hash)
1022 || (!community))
1023 return;
1024
1025 /* Look-up the community in the hash.
1026 */
1027 aggr_community = bgp_aggr_community_lookup(aggregate, community);
1028 if (aggr_community) {
1029 aggr_community->refcnt--;
1030
1031 if (aggr_community->refcnt == 0) {
1032 ret_comm = hash_release(aggregate->community_hash,
1033 aggr_community);
1034 community_free(&ret_comm);
1035
1036 bgp_compute_aggregate_community_val(aggregate);
1037 }
1038 }
1039 }
1040
1041 void bgp_remove_comm_from_aggregate_hash(struct bgp_aggregate *aggregate,
1042 struct community *community)
1043 {
1044
1045 struct community *aggr_community = NULL;
1046 struct community *ret_comm = NULL;
1047
1048 if ((!aggregate)
1049 || (!aggregate->community_hash)
1050 || (!community))
1051 return;
1052
1053 /* Look-up the community in the hash.
1054 */
1055 aggr_community = bgp_aggr_community_lookup(aggregate, community);
1056 if (aggr_community) {
1057 aggr_community->refcnt--;
1058
1059 if (aggr_community->refcnt == 0) {
1060 ret_comm = hash_release(aggregate->community_hash,
1061 aggr_community);
1062 community_free(&ret_comm);
1063 }
1064 }
1065 }
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