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57d187bc | 1 | /* BGP Large Communities Attribute |
2acb4ac2 DL |
2 | * |
3 | * Copyright (C) 2016 Keyur Patel <keyur@arrcus.com> | |
4 | * | |
5 | * This file is part of FreeRangeRouting (FRR). | |
6 | * | |
7 | * FRR is free software; you can redistribute it and/or modify it under the | |
8 | * terms of the GNU General Public License as published by the Free Software | |
9 | * Foundation; either version 2, or (at your option) any later version. | |
10 | * | |
11 | * FRR is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more | |
14 | * details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
896014f4 DL |
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 | |
2acb4ac2 | 19 | */ |
57d187bc JS |
20 | |
21 | #include <zebra.h> | |
22 | ||
23 | #include "hash.h" | |
24 | #include "memory.h" | |
25 | #include "prefix.h" | |
26 | #include "command.h" | |
27 | #include "filter.h" | |
3f65c5b1 | 28 | #include "jhash.h" |
937652c6 | 29 | #include "stream.h" |
57d187bc JS |
30 | |
31 | #include "bgpd/bgpd.h" | |
32 | #include "bgpd/bgp_lcommunity.h" | |
33 | #include "bgpd/bgp_aspath.h" | |
34 | ||
35 | /* Hash of community attribute. */ | |
36 | static struct hash *lcomhash; | |
37 | ||
38 | /* Allocate a new lcommunities. */ | |
d62a17ae | 39 | static struct lcommunity *lcommunity_new(void) |
57d187bc | 40 | { |
9f5dc319 | 41 | return XCALLOC(MTYPE_LCOMMUNITY, sizeof(struct lcommunity)); |
57d187bc JS |
42 | } |
43 | ||
44 | /* Allocate lcommunities. */ | |
d62a17ae | 45 | void lcommunity_free(struct lcommunity **lcom) |
57d187bc | 46 | { |
0a22ddfb QY |
47 | XFREE(MTYPE_LCOMMUNITY_VAL, (*lcom)->val); |
48 | XFREE(MTYPE_LCOMMUNITY_STR, (*lcom)->str); | |
d62a17ae | 49 | XFREE(MTYPE_LCOMMUNITY, *lcom); |
57d187bc JS |
50 | } |
51 | ||
d62a17ae | 52 | static void lcommunity_hash_free(struct lcommunity *lcom) |
47350fd9 | 53 | { |
d62a17ae | 54 | lcommunity_free(&lcom); |
47350fd9 DS |
55 | } |
56 | ||
57d187bc JS |
57 | /* Add a new Large Communities value to Large Communities |
58 | Attribute structure. When the value is already exists in the | |
59 | structure, we don't add the value. Newly added value is sorted by | |
60 | numerical order. When the value is added to the structure return 1 | |
61 | else return 0. */ | |
d62a17ae | 62 | static int lcommunity_add_val(struct lcommunity *lcom, |
63 | struct lcommunity_val *lval) | |
57d187bc | 64 | { |
d7c0a89a | 65 | uint8_t *p; |
d62a17ae | 66 | int ret; |
67 | int c; | |
68 | ||
69 | /* When this is fist value, just add it. */ | |
70 | if (lcom->val == NULL) { | |
71 | lcom->size++; | |
72 | lcom->val = XMALLOC(MTYPE_LCOMMUNITY_VAL, lcom_length(lcom)); | |
73 | memcpy(lcom->val, lval->val, LCOMMUNITY_SIZE); | |
74 | return 1; | |
75 | } | |
76 | ||
77 | /* If the value already exists in the structure return 0. */ | |
78 | c = 0; | |
79 | for (p = lcom->val; c < lcom->size; p += LCOMMUNITY_SIZE, c++) { | |
80 | ret = memcmp(p, lval->val, LCOMMUNITY_SIZE); | |
81 | if (ret == 0) | |
82 | return 0; | |
83 | if (ret > 0) | |
84 | break; | |
85 | } | |
86 | ||
87 | /* Add the value to the structure with numerical sorting. */ | |
88 | lcom->size++; | |
89 | lcom->val = | |
90 | XREALLOC(MTYPE_LCOMMUNITY_VAL, lcom->val, lcom_length(lcom)); | |
91 | ||
92 | memmove(lcom->val + (c + 1) * LCOMMUNITY_SIZE, | |
93 | lcom->val + c * LCOMMUNITY_SIZE, | |
94 | (lcom->size - 1 - c) * LCOMMUNITY_SIZE); | |
95 | memcpy(lcom->val + c * LCOMMUNITY_SIZE, lval->val, LCOMMUNITY_SIZE); | |
96 | ||
97 | return 1; | |
57d187bc JS |
98 | } |
99 | ||
100 | /* This function takes pointer to Large Communites strucutre then | |
101 | create a new Large Communities structure by uniq and sort each | |
102 | Large Communities value. */ | |
d62a17ae | 103 | struct lcommunity *lcommunity_uniq_sort(struct lcommunity *lcom) |
57d187bc | 104 | { |
d62a17ae | 105 | int i; |
106 | struct lcommunity *new; | |
107 | struct lcommunity_val *lval; | |
57d187bc | 108 | |
d62a17ae | 109 | if (!lcom) |
110 | return NULL; | |
57d187bc | 111 | |
d62a17ae | 112 | new = lcommunity_new(); |
57d187bc | 113 | |
d62a17ae | 114 | for (i = 0; i < lcom->size; i++) { |
115 | lval = (struct lcommunity_val *)(lcom->val | |
116 | + (i * LCOMMUNITY_SIZE)); | |
117 | lcommunity_add_val(new, lval); | |
118 | } | |
119 | return new; | |
57d187bc JS |
120 | } |
121 | ||
122 | /* Parse Large Communites Attribute in BGP packet. */ | |
d7c0a89a | 123 | struct lcommunity *lcommunity_parse(uint8_t *pnt, unsigned short length) |
57d187bc | 124 | { |
d62a17ae | 125 | struct lcommunity tmp; |
126 | struct lcommunity *new; | |
57d187bc | 127 | |
d62a17ae | 128 | /* Length check. */ |
129 | if (length % LCOMMUNITY_SIZE) | |
130 | return NULL; | |
57d187bc | 131 | |
d62a17ae | 132 | /* Prepare tmporary structure for making a new Large Communities |
133 | Attribute. */ | |
134 | tmp.size = length / LCOMMUNITY_SIZE; | |
135 | tmp.val = pnt; | |
57d187bc | 136 | |
d62a17ae | 137 | /* Create a new Large Communities Attribute by uniq and sort each |
138 | Large Communities value */ | |
139 | new = lcommunity_uniq_sort(&tmp); | |
57d187bc | 140 | |
d62a17ae | 141 | return lcommunity_intern(new); |
57d187bc JS |
142 | } |
143 | ||
144 | /* Duplicate the Large Communities Attribute structure. */ | |
d62a17ae | 145 | struct lcommunity *lcommunity_dup(struct lcommunity *lcom) |
57d187bc | 146 | { |
d62a17ae | 147 | struct lcommunity *new; |
148 | ||
cb0c2da3 | 149 | new = lcommunity_new(); |
d62a17ae | 150 | new->size = lcom->size; |
151 | if (new->size) { | |
79dab4b7 NK |
152 | new->val = XMALLOC(MTYPE_LCOMMUNITY_VAL, lcom_length(lcom)); |
153 | memcpy(new->val, lcom->val, lcom_length(lcom)); | |
d62a17ae | 154 | } else |
155 | new->val = NULL; | |
156 | return new; | |
57d187bc JS |
157 | } |
158 | ||
57d187bc | 159 | /* Merge two Large Communities Attribute structure. */ |
d62a17ae | 160 | struct lcommunity *lcommunity_merge(struct lcommunity *lcom1, |
161 | struct lcommunity *lcom2) | |
57d187bc | 162 | { |
d62a17ae | 163 | if (lcom1->val) |
996c9314 LB |
164 | lcom1->val = XREALLOC(MTYPE_LCOMMUNITY_VAL, lcom1->val, |
165 | lcom_length(lcom1) + lcom_length(lcom2)); | |
d62a17ae | 166 | else |
996c9314 LB |
167 | lcom1->val = XMALLOC(MTYPE_LCOMMUNITY_VAL, |
168 | lcom_length(lcom1) + lcom_length(lcom2)); | |
d62a17ae | 169 | |
79dab4b7 | 170 | memcpy(lcom1->val + lcom_length(lcom1), lcom2->val, lcom_length(lcom2)); |
d62a17ae | 171 | lcom1->size += lcom2->size; |
172 | ||
173 | return lcom1; | |
57d187bc JS |
174 | } |
175 | ||
8d9b8ed9 PM |
176 | static void set_lcommunity_string(struct lcommunity *lcom, bool make_json) |
177 | { | |
178 | int i; | |
179 | int len; | |
d8729f8c | 180 | bool first = true; |
8d9b8ed9 PM |
181 | char *str_buf; |
182 | char *str_pnt; | |
183 | uint8_t *pnt; | |
184 | uint32_t global, local1, local2; | |
185 | json_object *json_lcommunity_list = NULL; | |
186 | json_object *json_string = NULL; | |
187 | ||
188 | #define LCOMMUNITY_STR_DEFAULT_LEN 32 | |
189 | ||
190 | if (!lcom) | |
191 | return; | |
192 | ||
193 | if (make_json) { | |
194 | lcom->json = json_object_new_object(); | |
195 | json_lcommunity_list = json_object_new_array(); | |
196 | } | |
197 | ||
198 | if (lcom->size == 0) { | |
199 | str_buf = XMALLOC(MTYPE_LCOMMUNITY_STR, 1); | |
200 | str_buf[0] = '\0'; | |
201 | ||
202 | if (make_json) { | |
203 | json_object_string_add(lcom->json, "string", ""); | |
204 | json_object_object_add(lcom->json, "list", | |
205 | json_lcommunity_list); | |
206 | } | |
207 | ||
208 | lcom->str = str_buf; | |
209 | return; | |
210 | } | |
211 | ||
212 | str_buf = str_pnt = | |
213 | XMALLOC(MTYPE_LCOMMUNITY_STR, | |
214 | (LCOMMUNITY_STR_DEFAULT_LEN * lcom->size) + 1); | |
215 | ||
216 | for (i = 0; i < lcom->size; i++) { | |
217 | if (first) | |
d8729f8c | 218 | first = false; |
8d9b8ed9 PM |
219 | else |
220 | *str_pnt++ = ' '; | |
221 | ||
222 | pnt = lcom->val + (i * LCOMMUNITY_SIZE); | |
223 | pnt = ptr_get_be32(pnt, &global); | |
224 | pnt = ptr_get_be32(pnt, &local1); | |
225 | pnt = ptr_get_be32(pnt, &local2); | |
226 | (void)pnt; | |
227 | ||
228 | len = sprintf(str_pnt, "%u:%u:%u", global, local1, local2); | |
229 | if (make_json) { | |
230 | json_string = json_object_new_string(str_pnt); | |
231 | json_object_array_add(json_lcommunity_list, | |
232 | json_string); | |
233 | } | |
234 | ||
235 | str_pnt += len; | |
236 | } | |
237 | ||
238 | str_buf = | |
239 | XREALLOC(MTYPE_LCOMMUNITY_STR, str_buf, str_pnt - str_buf + 1); | |
240 | ||
241 | if (make_json) { | |
242 | json_object_string_add(lcom->json, "string", str_buf); | |
243 | json_object_object_add(lcom->json, "list", | |
244 | json_lcommunity_list); | |
245 | } | |
246 | ||
247 | lcom->str = str_buf; | |
248 | } | |
249 | ||
57d187bc | 250 | /* Intern Large Communities Attribute. */ |
d62a17ae | 251 | struct lcommunity *lcommunity_intern(struct lcommunity *lcom) |
57d187bc | 252 | { |
d62a17ae | 253 | struct lcommunity *find; |
57d187bc | 254 | |
d62a17ae | 255 | assert(lcom->refcnt == 0); |
57d187bc | 256 | |
d62a17ae | 257 | find = (struct lcommunity *)hash_get(lcomhash, lcom, hash_alloc_intern); |
57d187bc | 258 | |
d62a17ae | 259 | if (find != lcom) |
260 | lcommunity_free(&lcom); | |
57d187bc | 261 | |
d62a17ae | 262 | find->refcnt++; |
57d187bc | 263 | |
d62a17ae | 264 | if (!find->str) |
8d9b8ed9 | 265 | set_lcommunity_string(find, false); |
57d187bc | 266 | |
d62a17ae | 267 | return find; |
57d187bc JS |
268 | } |
269 | ||
270 | /* Unintern Large Communities Attribute. */ | |
d62a17ae | 271 | void lcommunity_unintern(struct lcommunity **lcom) |
57d187bc | 272 | { |
d62a17ae | 273 | struct lcommunity *ret; |
57d187bc | 274 | |
d62a17ae | 275 | if ((*lcom)->refcnt) |
276 | (*lcom)->refcnt--; | |
57d187bc | 277 | |
d62a17ae | 278 | /* Pull off from hash. */ |
279 | if ((*lcom)->refcnt == 0) { | |
280 | /* Large community must be in the hash. */ | |
281 | ret = (struct lcommunity *)hash_release(lcomhash, *lcom); | |
282 | assert(ret != NULL); | |
57d187bc | 283 | |
d62a17ae | 284 | lcommunity_free(lcom); |
285 | } | |
57d187bc JS |
286 | } |
287 | ||
8d9b8ed9 PM |
288 | /* Retrun string representation of communities attribute. */ |
289 | char *lcommunity_str(struct lcommunity *lcom, bool make_json) | |
290 | { | |
291 | if (!lcom) | |
292 | return NULL; | |
293 | ||
294 | if (make_json && !lcom->json && lcom->str) | |
295 | XFREE(MTYPE_LCOMMUNITY_STR, lcom->str); | |
296 | ||
297 | if (!lcom->str) | |
298 | set_lcommunity_string(lcom, make_json); | |
299 | ||
300 | return lcom->str; | |
301 | } | |
302 | ||
57d187bc | 303 | /* Utility function to make hash key. */ |
d8b87afe | 304 | unsigned int lcommunity_hash_make(const void *arg) |
57d187bc | 305 | { |
d62a17ae | 306 | const struct lcommunity *lcom = arg; |
79dab4b7 | 307 | int size = lcom_length(lcom); |
d62a17ae | 308 | |
3f65c5b1 | 309 | return jhash(lcom->val, size, 0xab125423); |
57d187bc JS |
310 | } |
311 | ||
312 | /* Compare two Large Communities Attribute structure. */ | |
74df8d6d | 313 | bool lcommunity_cmp(const void *arg1, const void *arg2) |
57d187bc | 314 | { |
d62a17ae | 315 | const struct lcommunity *lcom1 = arg1; |
316 | const struct lcommunity *lcom2 = arg2; | |
57d187bc | 317 | |
fbcdff82 | 318 | if (lcom1 == NULL && lcom2 == NULL) |
b08047f8 | 319 | return true; |
fbcdff82 RW |
320 | |
321 | if (lcom1 == NULL || lcom2 == NULL) | |
b08047f8 | 322 | return false; |
fbcdff82 | 323 | |
d62a17ae | 324 | return (lcom1->size == lcom2->size |
996c9314 | 325 | && memcmp(lcom1->val, lcom2->val, lcom_length(lcom1)) == 0); |
57d187bc JS |
326 | } |
327 | ||
328 | /* Return communities hash. */ | |
d62a17ae | 329 | struct hash *lcommunity_hash(void) |
57d187bc | 330 | { |
d62a17ae | 331 | return lcomhash; |
57d187bc JS |
332 | } |
333 | ||
334 | /* Initialize Large Comminities related hash. */ | |
d62a17ae | 335 | void lcommunity_init(void) |
57d187bc | 336 | { |
996c9314 | 337 | lcomhash = hash_create(lcommunity_hash_make, lcommunity_cmp, |
3f65c5b1 | 338 | "BGP lcommunity hash"); |
57d187bc JS |
339 | } |
340 | ||
d62a17ae | 341 | void lcommunity_finish(void) |
57d187bc | 342 | { |
d62a17ae | 343 | hash_clean(lcomhash, (void (*)(void *))lcommunity_hash_free); |
344 | hash_free(lcomhash); | |
345 | lcomhash = NULL; | |
57d187bc JS |
346 | } |
347 | ||
348 | /* Large Communities token enum. */ | |
d62a17ae | 349 | enum lcommunity_token { |
350 | lcommunity_token_unknown = 0, | |
351 | lcommunity_token_val, | |
57d187bc JS |
352 | }; |
353 | ||
354 | /* Get next Large Communities token from the string. */ | |
d62a17ae | 355 | static const char *lcommunity_gettoken(const char *str, |
356 | struct lcommunity_val *lval, | |
357 | enum lcommunity_token *token) | |
57d187bc | 358 | { |
d62a17ae | 359 | const char *p = str; |
360 | ||
361 | /* Skip white space. */ | |
fefa5e0f | 362 | while (isspace((unsigned char)*p)) { |
d62a17ae | 363 | p++; |
364 | str++; | |
365 | } | |
366 | ||
367 | /* Check the end of the line. */ | |
368 | if (*p == '\0') | |
369 | return NULL; | |
370 | ||
371 | /* Community value. */ | |
fefa5e0f | 372 | if (isdigit((unsigned char)*p)) { |
d62a17ae | 373 | int separator = 0; |
374 | int digit = 0; | |
d7c0a89a QY |
375 | uint32_t globaladmin = 0; |
376 | uint32_t localdata1 = 0; | |
377 | uint32_t localdata2 = 0; | |
d62a17ae | 378 | |
fefa5e0f | 379 | while (isdigit((unsigned char)*p) || *p == ':') { |
d62a17ae | 380 | if (*p == ':') { |
381 | if (separator == 2) { | |
382 | *token = lcommunity_token_unknown; | |
383 | return NULL; | |
384 | } else { | |
385 | separator++; | |
386 | digit = 0; | |
387 | if (separator == 1) { | |
388 | globaladmin = localdata2; | |
389 | } else { | |
390 | localdata1 = localdata2; | |
391 | } | |
392 | localdata2 = 0; | |
393 | } | |
394 | } else { | |
395 | digit = 1; | |
396 | localdata2 *= 10; | |
397 | localdata2 += (*p - '0'); | |
398 | } | |
399 | p++; | |
57d187bc | 400 | } |
d62a17ae | 401 | if (!digit) { |
402 | *token = lcommunity_token_unknown; | |
403 | return NULL; | |
57d187bc | 404 | } |
57d187bc | 405 | |
d62a17ae | 406 | /* |
407 | * Copy the large comm. | |
408 | */ | |
409 | lval->val[0] = (globaladmin >> 24) & 0xff; | |
410 | lval->val[1] = (globaladmin >> 16) & 0xff; | |
411 | lval->val[2] = (globaladmin >> 8) & 0xff; | |
412 | lval->val[3] = globaladmin & 0xff; | |
413 | lval->val[4] = (localdata1 >> 24) & 0xff; | |
414 | lval->val[5] = (localdata1 >> 16) & 0xff; | |
415 | lval->val[6] = (localdata1 >> 8) & 0xff; | |
416 | lval->val[7] = localdata1 & 0xff; | |
417 | lval->val[8] = (localdata2 >> 24) & 0xff; | |
418 | lval->val[9] = (localdata2 >> 16) & 0xff; | |
419 | lval->val[10] = (localdata2 >> 8) & 0xff; | |
420 | lval->val[11] = localdata2 & 0xff; | |
421 | ||
422 | *token = lcommunity_token_val; | |
423 | return p; | |
424 | } | |
425 | *token = lcommunity_token_unknown; | |
426 | return p; | |
57d187bc JS |
427 | } |
428 | ||
429 | /* | |
430 | Convert string to large community attribute. | |
431 | When type is already known, please specify both str and type. | |
432 | ||
433 | When string includes keyword for each large community value. | |
434 | Please specify keyword_included as non-zero value. | |
435 | */ | |
d62a17ae | 436 | struct lcommunity *lcommunity_str2com(const char *str) |
57d187bc | 437 | { |
d62a17ae | 438 | struct lcommunity *lcom = NULL; |
439 | enum lcommunity_token token = lcommunity_token_unknown; | |
440 | struct lcommunity_val lval; | |
441 | ||
6aee3848 NT |
442 | do { |
443 | str = lcommunity_gettoken(str, &lval, &token); | |
d62a17ae | 444 | switch (token) { |
445 | case lcommunity_token_val: | |
446 | if (lcom == NULL) | |
447 | lcom = lcommunity_new(); | |
448 | lcommunity_add_val(lcom, &lval); | |
449 | break; | |
450 | case lcommunity_token_unknown: | |
451 | default: | |
452 | if (lcom) | |
453 | lcommunity_free(&lcom); | |
454 | return NULL; | |
455 | } | |
6aee3848 NT |
456 | } while (str); |
457 | ||
d62a17ae | 458 | return lcom; |
57d187bc JS |
459 | } |
460 | ||
d7c0a89a | 461 | int lcommunity_include(struct lcommunity *lcom, uint8_t *ptr) |
57d187bc | 462 | { |
d62a17ae | 463 | int i; |
d7c0a89a | 464 | uint8_t *lcom_ptr; |
d62a17ae | 465 | |
d62a17ae | 466 | for (i = 0; i < lcom->size; i++) { |
3ac053e6 | 467 | lcom_ptr = lcom->val + (i * LCOMMUNITY_SIZE); |
d62a17ae | 468 | if (memcmp(ptr, lcom_ptr, LCOMMUNITY_SIZE) == 0) |
469 | return 1; | |
470 | } | |
471 | return 0; | |
57d187bc JS |
472 | } |
473 | ||
d62a17ae | 474 | int lcommunity_match(const struct lcommunity *lcom1, |
475 | const struct lcommunity *lcom2) | |
57d187bc | 476 | { |
d62a17ae | 477 | int i = 0; |
478 | int j = 0; | |
479 | ||
480 | if (lcom1 == NULL && lcom2 == NULL) | |
481 | return 1; | |
482 | ||
483 | if (lcom1 == NULL || lcom2 == NULL) | |
484 | return 0; | |
485 | ||
486 | if (lcom1->size < lcom2->size) | |
487 | return 0; | |
488 | ||
489 | /* Every community on com2 needs to be on com1 for this to match */ | |
490 | while (i < lcom1->size && j < lcom2->size) { | |
996c9314 LB |
491 | if (memcmp(lcom1->val + (i * LCOMMUNITY_SIZE), |
492 | lcom2->val + (j * LCOMMUNITY_SIZE), LCOMMUNITY_SIZE) | |
d62a17ae | 493 | == 0) |
494 | j++; | |
495 | i++; | |
496 | } | |
497 | ||
498 | if (j == lcom2->size) | |
499 | return 1; | |
500 | else | |
501 | return 0; | |
57d187bc JS |
502 | } |
503 | ||
504 | /* Delete one lcommunity. */ | |
d7c0a89a | 505 | void lcommunity_del_val(struct lcommunity *lcom, uint8_t *ptr) |
57d187bc | 506 | { |
d62a17ae | 507 | int i = 0; |
508 | int c = 0; | |
509 | ||
510 | if (!lcom->val) | |
511 | return; | |
512 | ||
513 | while (i < lcom->size) { | |
514 | if (memcmp(lcom->val + i * LCOMMUNITY_SIZE, ptr, | |
515 | LCOMMUNITY_SIZE) | |
516 | == 0) { | |
517 | c = lcom->size - i - 1; | |
518 | ||
519 | if (c > 0) | |
520 | memmove(lcom->val + i * LCOMMUNITY_SIZE, | |
521 | lcom->val + (i + 1) * LCOMMUNITY_SIZE, | |
522 | c * LCOMMUNITY_SIZE); | |
523 | ||
524 | lcom->size--; | |
525 | ||
526 | if (lcom->size > 0) | |
527 | lcom->val = | |
996c9314 LB |
528 | XREALLOC(MTYPE_LCOMMUNITY_VAL, |
529 | lcom->val, lcom_length(lcom)); | |
d62a17ae | 530 | else { |
600d7ff8 | 531 | XFREE(MTYPE_LCOMMUNITY_VAL, lcom->val); |
d62a17ae | 532 | lcom->val = NULL; |
533 | } | |
534 | return; | |
535 | } | |
536 | i++; | |
57d187bc | 537 | } |
57d187bc | 538 | } |
4c99b6c2 NT |
539 | |
540 | static struct lcommunity *bgp_aggr_lcommunity_lookup( | |
541 | struct bgp_aggregate *aggregate, | |
542 | struct lcommunity *lcommunity) | |
543 | { | |
544 | return hash_lookup(aggregate->lcommunity_hash, lcommunity); | |
545 | } | |
546 | ||
547 | static void *bgp_aggr_lcommunty_hash_alloc(void *p) | |
548 | { | |
549 | struct lcommunity *ref = (struct lcommunity *)p; | |
550 | struct lcommunity *lcommunity = NULL; | |
551 | ||
552 | lcommunity = lcommunity_dup(ref); | |
553 | return lcommunity; | |
554 | } | |
555 | ||
556 | static void bgp_aggr_lcommunity_prepare(struct hash_backet *hb, void *arg) | |
557 | { | |
558 | struct lcommunity *lcommerge = NULL; | |
559 | struct lcommunity *hb_lcommunity = hb->data; | |
560 | struct lcommunity **aggr_lcommunity = arg; | |
561 | ||
562 | if (*aggr_lcommunity) { | |
563 | lcommerge = lcommunity_merge(*aggr_lcommunity, hb_lcommunity); | |
564 | *aggr_lcommunity = lcommunity_uniq_sort(lcommerge); | |
565 | lcommunity_free(&lcommerge); | |
566 | } else | |
567 | *aggr_lcommunity = lcommunity_dup(hb_lcommunity); | |
568 | } | |
569 | ||
570 | void bgp_aggr_lcommunity_remove(void *arg) | |
571 | { | |
572 | struct lcommunity *lcommunity = arg; | |
573 | ||
574 | lcommunity_free(&lcommunity); | |
575 | } | |
576 | ||
577 | void bgp_compute_aggregate_lcommunity(struct bgp_aggregate *aggregate, | |
578 | struct lcommunity *lcommunity) | |
579 | { | |
580 | struct lcommunity *aggr_lcommunity = NULL; | |
581 | ||
582 | if ((aggregate == NULL) || (lcommunity == NULL)) | |
583 | return; | |
584 | ||
585 | /* Create hash if not already created. | |
586 | */ | |
587 | if (aggregate->lcommunity_hash == NULL) | |
588 | aggregate->lcommunity_hash = hash_create( | |
589 | lcommunity_hash_make, lcommunity_cmp, | |
590 | "BGP Aggregator lcommunity hash"); | |
591 | ||
592 | aggr_lcommunity = bgp_aggr_lcommunity_lookup(aggregate, lcommunity); | |
593 | if (aggr_lcommunity == NULL) { | |
594 | /* Insert lcommunity into hash. | |
595 | */ | |
596 | aggr_lcommunity = hash_get(aggregate->lcommunity_hash, | |
597 | lcommunity, | |
598 | bgp_aggr_lcommunty_hash_alloc); | |
599 | ||
600 | /* Re-compute aggregate's lcommunity. | |
601 | */ | |
602 | if (aggregate->lcommunity) | |
603 | lcommunity_free(&aggregate->lcommunity); | |
604 | ||
605 | hash_iterate(aggregate->lcommunity_hash, | |
606 | bgp_aggr_lcommunity_prepare, | |
607 | &aggregate->lcommunity); | |
608 | } | |
609 | ||
610 | /* Increment refernce counter. | |
611 | */ | |
612 | aggr_lcommunity->refcnt++; | |
613 | } | |
614 | ||
615 | void bgp_remove_lcommunity_from_aggregate(struct bgp_aggregate *aggregate, | |
616 | struct lcommunity *lcommunity) | |
617 | { | |
618 | struct lcommunity *aggr_lcommunity = NULL; | |
619 | struct lcommunity *ret_lcomm = NULL; | |
620 | ||
621 | if ((aggregate == NULL) || (lcommunity == NULL)) | |
622 | return; | |
623 | ||
624 | if (aggregate->lcommunity_hash == NULL) | |
625 | return; | |
626 | ||
627 | /* Look-up the lcommunity in the hash. | |
628 | */ | |
629 | aggr_lcommunity = bgp_aggr_lcommunity_lookup(aggregate, lcommunity); | |
630 | if (aggr_lcommunity) { | |
631 | aggr_lcommunity->refcnt--; | |
632 | ||
633 | if (aggr_lcommunity->refcnt == 0) { | |
634 | ret_lcomm = hash_release(aggregate->lcommunity_hash, | |
635 | aggr_lcommunity); | |
636 | lcommunity_free(&ret_lcomm); | |
637 | ||
638 | lcommunity_free(&aggregate->lcommunity); | |
639 | ||
640 | /* Compute aggregate's lcommunity. | |
641 | */ | |
642 | hash_iterate(aggregate->lcommunity_hash, | |
643 | bgp_aggr_lcommunity_prepare, | |
644 | &aggregate->lcommunity); | |
645 | } | |
646 | } | |
647 | } |