diff options
Diffstat (limited to 'bgpd/bgp_community.c')
| -rw-r--r-- | bgpd/bgp_community.c | 1079 |
1 files changed, 1079 insertions, 0 deletions
diff --git a/bgpd/bgp_community.c b/bgpd/bgp_community.c new file mode 100644 index 0000000..9f6f337 --- /dev/null +++ b/bgpd/bgp_community.c @@ -0,0 +1,1079 @@ +/* Community attribute related functions. + * Copyright (C) 1998, 2001 Kunihiro Ishiguro + * + * 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 this program; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <zebra.h> + +#include "command.h" +#include "hash.h" +#include "memory.h" +#include "jhash.h" +#include "frrstr.h" + +#include "bgpd/bgp_memory.h" +#include "bgpd/bgp_community.h" +#include "bgpd/bgp_community_alias.h" + +/* Hash of community attribute. */ +static struct hash *comhash; + +/* Allocate a new communities value. */ +static struct community *community_new(void) +{ + return XCALLOC(MTYPE_COMMUNITY, sizeof(struct community)); +} + +/* Free communities value. */ +void community_free(struct community **com) +{ + if (!(*com)) + return; + + XFREE(MTYPE_COMMUNITY_VAL, (*com)->val); + XFREE(MTYPE_COMMUNITY_STR, (*com)->str); + + if ((*com)->json) { + json_object_free((*com)->json); + (*com)->json = NULL; + } + + XFREE(MTYPE_COMMUNITY, (*com)); +} + +/* Add one community value to the community. */ +void community_add_val(struct community *com, uint32_t val) +{ + com->size++; + com->val = XREALLOC(MTYPE_COMMUNITY_VAL, com->val, com_length(com)); + + val = htonl(val); + memcpy(com_lastval(com), &val, sizeof(uint32_t)); +} + +/* Delete one community. */ +void community_del_val(struct community *com, uint32_t *val) +{ + int i = 0; + int c = 0; + + if (!com->val) + return; + + while (i < com->size) { + if (memcmp(com->val + i, val, sizeof(uint32_t)) == 0) { + c = com->size - i - 1; + + if (c > 0) + memmove(com->val + i, com->val + (i + 1), + c * sizeof(*val)); + + com->size--; + + if (com->size > 0) + com->val = XREALLOC(MTYPE_COMMUNITY_VAL, + com->val, com_length(com)); + else { + XFREE(MTYPE_COMMUNITY_VAL, com->val); + } + return; + } + i++; + } +} + +/* Delete all communities listed in com2 from com1 */ +struct community *community_delete(struct community *com1, + struct community *com2) +{ + int i = 0; + + while (i < com2->size) { + community_del_val(com1, com2->val + i); + i++; + } + + return com1; +} + +/* Callback function from qsort(). */ +static int community_compare(const void *a1, const void *a2) +{ + uint32_t v1; + uint32_t v2; + + memcpy(&v1, a1, sizeof(uint32_t)); + memcpy(&v2, a2, sizeof(uint32_t)); + v1 = ntohl(v1); + v2 = ntohl(v2); + + if (v1 < v2) + return -1; + if (v1 > v2) + return 1; + return 0; +} + +bool community_include(struct community *com, uint32_t val) +{ + int i; + + val = htonl(val); + + for (i = 0; i < com->size; i++) + if (memcmp(&val, com_nthval(com, i), sizeof(uint32_t)) == 0) + return true; + return false; +} + +uint32_t community_val_get(struct community *com, int i) +{ + uint8_t *p; + uint32_t val; + + p = (uint8_t *)com->val; + p += (i * COMMUNITY_SIZE); + + memcpy(&val, p, sizeof(uint32_t)); + + return ntohl(val); +} + +/* Sort and uniq given community. */ +struct community *community_uniq_sort(struct community *com) +{ + int i; + struct community *new; + uint32_t val; + + if (!com) + return NULL; + + new = community_new(); + new->json = NULL; + + for (i = 0; i < com->size; i++) { + val = community_val_get(com, i); + + if (!community_include(new, val)) + community_add_val(new, val); + } + + qsort(new->val, new->size, sizeof(uint32_t), community_compare); + + return new; +} + +/* Convert communities attribute to string. + + For Well-known communities value, below keyword is used. + + 0x0 "internet" + 0xFFFF0000 "graceful-shutdown" + 0xFFFF0001 "accept-own" + 0xFFFF0002 "route-filter-translated-v4" + 0xFFFF0003 "route-filter-v4" + 0xFFFF0004 "route-filter-translated-v6" + 0xFFFF0005 "route-filter-v6" + 0xFFFF0006 "llgr-stale" + 0xFFFF0007 "no-llgr" + 0xFFFF0008 "accept-own-nexthop" + 0xFFFF029A "blackhole" + 0xFFFFFF01 "no-export" + 0xFFFFFF02 "no-advertise" + 0xFFFFFF03 "local-AS" + 0xFFFFFF04 "no-peer" + + For other values, "AS:VAL" format is used. */ +static void set_community_string(struct community *com, bool make_json, + bool translate_alias) +{ + int i; + char *str; + int len; + int first; + uint32_t comval; + uint16_t as; + uint16_t val; + json_object *json_community_list = NULL; + json_object *json_string = NULL; + + if (!com) + return; + + if (make_json) { + com->json = json_object_new_object(); + json_community_list = json_object_new_array(); + } + + /* When communities attribute is empty. */ + if (com->size == 0) { + str = XMALLOC(MTYPE_COMMUNITY_STR, 1); + str[0] = '\0'; + + if (make_json) { + json_object_string_add(com->json, "string", ""); + json_object_object_add(com->json, "list", + json_community_list); + } + com->str = str; + return; + } + + /* Memory allocation is time consuming work. So we calculate + required string length first. */ + len = 0; + + for (i = 0; i < com->size; i++) { + memcpy(&comval, com_nthval(com, i), sizeof(uint32_t)); + comval = ntohl(comval); + + switch (comval) { + case COMMUNITY_INTERNET: + len += strlen(" internet"); + break; + case COMMUNITY_GSHUT: + len += strlen(" graceful-shutdown"); + break; + case COMMUNITY_ACCEPT_OWN: + len += strlen(" accept-own"); + break; + case COMMUNITY_ROUTE_FILTER_TRANSLATED_v4: + len += strlen(" route-filter-translated-v4"); + break; + case COMMUNITY_ROUTE_FILTER_v4: + len += strlen(" route-filter-v4"); + break; + case COMMUNITY_ROUTE_FILTER_TRANSLATED_v6: + len += strlen(" route-filter-translated-v6"); + break; + case COMMUNITY_ROUTE_FILTER_v6: + len += strlen(" route-filter-v6"); + break; + case COMMUNITY_LLGR_STALE: + len += strlen(" llgr-stale"); + break; + case COMMUNITY_NO_LLGR: + len += strlen(" no-llgr"); + break; + case COMMUNITY_ACCEPT_OWN_NEXTHOP: + len += strlen(" accept-own-nexthop"); + break; + case COMMUNITY_BLACKHOLE: + len += strlen(" blackhole"); + break; + case COMMUNITY_NO_EXPORT: + len += strlen(" no-export"); + break; + case COMMUNITY_NO_ADVERTISE: + len += strlen(" no-advertise"); + break; + case COMMUNITY_LOCAL_AS: + len += strlen(" local-AS"); + break; + case COMMUNITY_NO_PEER: + len += strlen(" no-peer"); + break; + default: + len = BUFSIZ; + break; + } + } + + /* Allocate memory. */ + str = XCALLOC(MTYPE_COMMUNITY_STR, len); + first = 1; + + /* Fill in string. */ + for (i = 0; i < com->size; i++) { + memcpy(&comval, com_nthval(com, i), sizeof(uint32_t)); + comval = ntohl(comval); + + if (first) + first = 0; + else + strlcat(str, " ", len); + + switch (comval) { + case COMMUNITY_INTERNET: + strlcat(str, "internet", len); + if (make_json) { + json_string = + json_object_new_string("internet"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_GSHUT: + strlcat(str, "graceful-shutdown", len); + if (make_json) { + json_string = json_object_new_string( + "gracefulShutdown"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_ACCEPT_OWN: + strlcat(str, "accept-own", len); + if (make_json) { + json_string = json_object_new_string( + "acceptown"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_ROUTE_FILTER_TRANSLATED_v4: + strlcat(str, "route-filter-translated-v4", len); + if (make_json) { + json_string = json_object_new_string( + "routeFilterTranslatedV4"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_ROUTE_FILTER_v4: + strlcat(str, "route-filter-v4", len); + if (make_json) { + json_string = json_object_new_string( + "routeFilterV4"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_ROUTE_FILTER_TRANSLATED_v6: + strlcat(str, "route-filter-translated-v6", len); + if (make_json) { + json_string = json_object_new_string( + "routeFilterTranslatedV6"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_ROUTE_FILTER_v6: + strlcat(str, "route-filter-v6", len); + if (make_json) { + json_string = json_object_new_string( + "routeFilterV6"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_LLGR_STALE: + strlcat(str, "llgr-stale", len); + if (make_json) { + json_string = json_object_new_string( + "llgrStale"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_NO_LLGR: + strlcat(str, "no-llgr", len); + if (make_json) { + json_string = json_object_new_string( + "noLlgr"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_ACCEPT_OWN_NEXTHOP: + strlcat(str, "accept-own-nexthop", len); + if (make_json) { + json_string = json_object_new_string( + "acceptownnexthop"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_BLACKHOLE: + strlcat(str, "blackhole", len); + if (make_json) { + json_string = json_object_new_string( + "blackhole"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_NO_EXPORT: + strlcat(str, "no-export", len); + if (make_json) { + json_string = + json_object_new_string("noExport"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_NO_ADVERTISE: + strlcat(str, "no-advertise", len); + if (make_json) { + json_string = + json_object_new_string("noAdvertise"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_LOCAL_AS: + strlcat(str, "local-AS", len); + if (make_json) { + json_string = json_object_new_string("localAs"); + json_object_array_add(json_community_list, + json_string); + } + break; + case COMMUNITY_NO_PEER: + strlcat(str, "no-peer", len); + if (make_json) { + json_string = json_object_new_string("noPeer"); + json_object_array_add(json_community_list, + json_string); + } + break; + default: + as = (comval >> 16) & 0xFFFF; + val = comval & 0xFFFF; + char buf[32]; + snprintf(buf, sizeof(buf), "%u:%d", as, val); + const char *com2alias = + translate_alias ? bgp_community2alias(buf) + : buf; + + strlcat(str, com2alias, len); + if (make_json) { + json_string = json_object_new_string(com2alias); + json_object_array_add(json_community_list, + json_string); + } + break; + } + } + + if (make_json) { + json_object_string_add(com->json, "string", str); + json_object_object_add(com->json, "list", json_community_list); + } + com->str = str; +} + +/* Intern communities attribute. */ +struct community *community_intern(struct community *com) +{ + struct community *find; + + /* Assert this community structure is not interned. */ + assert(com->refcnt == 0); + + /* Lookup community hash. */ + find = (struct community *)hash_get(comhash, com, hash_alloc_intern); + + /* Arguemnt com is allocated temporary. So when it is not used in + hash, it should be freed. */ + if (find != com) + community_free(&com); + + /* Increment refrence counter. */ + find->refcnt++; + + /* Make string. */ + if (!find->str) + set_community_string(find, false, true); + + return find; +} + +/* Free community attribute. */ +void community_unintern(struct community **com) +{ + struct community *ret; + + if (!*com) + return; + + if ((*com)->refcnt) + (*com)->refcnt--; + + /* Pull off from hash. */ + if ((*com)->refcnt == 0) { + /* Community value com must exist in hash. */ + ret = (struct community *)hash_release(comhash, *com); + assert(ret != NULL); + + community_free(com); + } +} + +/* Create new community attribute. */ +struct community *community_parse(uint32_t *pnt, unsigned short length) +{ + struct community tmp; + struct community *new; + + /* If length is malformed return NULL. */ + if (length % COMMUNITY_SIZE) + return NULL; + + /* Make temporary community for hash look up. */ + tmp.size = length / COMMUNITY_SIZE; + tmp.val = pnt; + + new = community_uniq_sort(&tmp); + + return community_intern(new); +} + +struct community *community_dup(struct community *com) +{ + struct community *new; + + new = XCALLOC(MTYPE_COMMUNITY, sizeof(struct community)); + new->size = com->size; + if (new->size) { + new->val = XMALLOC(MTYPE_COMMUNITY_VAL, + com->size * COMMUNITY_SIZE); + memcpy(new->val, com->val, com->size * COMMUNITY_SIZE); + } else + new->val = NULL; + return new; +} + +/* Return string representation of communities attribute. */ +char *community_str(struct community *com, bool make_json, bool translate_alias) +{ + if (!com) + return NULL; + + if (make_json && !com->json && com->str) + XFREE(MTYPE_COMMUNITY_STR, com->str); + + if (!com->str) + set_community_string(com, make_json, translate_alias); + return com->str; +} + +/* Make hash value of community attribute. This function is used by + hash package.*/ +unsigned int community_hash_make(const struct community *com) +{ + uint32_t *pnt = com->val; + + return jhash2(pnt, com->size, 0x43ea96c1); +} + +bool community_match(const struct community *com1, const struct community *com2) +{ + int i = 0; + int j = 0; + + if (com1 == NULL && com2 == NULL) + return true; + + if (com1 == NULL || com2 == NULL) + return false; + + if (com1->size < com2->size) + return false; + + /* Every community on com2 needs to be on com1 for this to match */ + while (i < com1->size && j < com2->size) { + if (memcmp(com1->val + i, com2->val + j, sizeof(uint32_t)) == 0) + j++; + i++; + } + + if (j == com2->size) + return true; + else + return false; +} + +bool community_cmp(const struct community *com1, const struct community *com2) +{ + if (com1 == NULL && com2 == NULL) + return true; + if (com1 == NULL || com2 == NULL) + return false; + + if (com1->size == com2->size) + if (memcmp(com1->val, com2->val, com1->size * COMMUNITY_SIZE) + == 0) + return true; + return false; +} + +/* Add com2 to the end of com1. */ +struct community *community_merge(struct community *com1, + struct community *com2) +{ + com1->val = XREALLOC(MTYPE_COMMUNITY_VAL, com1->val, + (com1->size + com2->size) * COMMUNITY_SIZE); + + memcpy(com1->val + com1->size, com2->val, com2->size * COMMUNITY_SIZE); + com1->size += com2->size; + + return com1; +} + +/* Community token enum. */ +enum community_token { + community_token_val, + community_token_gshut, + community_token_accept_own, + community_token_route_filter_translated_v4, + community_token_route_filter_v4, + community_token_route_filter_translated_v6, + community_token_route_filter_v6, + community_token_llgr_stale, + community_token_no_llgr, + community_token_accept_own_nexthop, + community_token_blackhole, + community_token_no_export, + community_token_no_advertise, + community_token_local_as, + community_token_no_peer, + community_token_unknown +}; + +/* Helper to check if a given community is valid */ +static bool community_valid(const char *community) +{ + int octets = 0; + char **splits; + int num; + int invalid = 0; + + frrstr_split(community, ":", &splits, &num); + + for (int i = 0; i < num; i++) { + if (strtoul(splits[i], NULL, 10) > UINT16_MAX) + invalid++; + + if (strlen(splits[i]) == 0) + invalid++; + + octets++; + XFREE(MTYPE_TMP, splits[i]); + } + XFREE(MTYPE_TMP, splits); + + return (octets < 2 || invalid) ? false : true; +} + +/* Get next community token from string. */ +static const char * +community_gettoken(const char *buf, enum community_token *token, uint32_t *val) +{ + const char *p = buf; + + /* Skip white space. */ + while (isspace((unsigned char)*p)) + p++; + + /* Check the end of the line. */ + if (*p == '\0') + return NULL; + + /* Well known community string check. */ + if (isalpha((unsigned char)*p)) { + if (strncmp(p, "internet", strlen("internet")) == 0) { + *val = COMMUNITY_INTERNET; + *token = community_token_no_export; + p += strlen("internet"); + return p; + } + if (strncmp(p, "graceful-shutdown", strlen("graceful-shutdown")) + == 0) { + *val = COMMUNITY_GSHUT; + *token = community_token_gshut; + p += strlen("graceful-shutdown"); + return p; + } + if (strncmp(p, "accept-own-nexthop", + strlen("accept-own-nexthop")) + == 0) { + *val = COMMUNITY_ACCEPT_OWN_NEXTHOP; + *token = community_token_accept_own_nexthop; + p += strlen("accept-own-nexthop"); + return p; + } + if (strncmp(p, "accept-own", strlen("accept-own")) + == 0) { + *val = COMMUNITY_ACCEPT_OWN; + *token = community_token_accept_own; + p += strlen("accept-own"); + return p; + } + if (strncmp(p, "route-filter-translated-v4", + strlen("route-filter-translated-v4")) + == 0) { + *val = COMMUNITY_ROUTE_FILTER_TRANSLATED_v4; + *token = community_token_route_filter_translated_v4; + p += strlen("route-filter-translated-v4"); + return p; + } + if (strncmp(p, "route-filter-v4", strlen("route-filter-v4")) + == 0) { + *val = COMMUNITY_ROUTE_FILTER_v4; + *token = community_token_route_filter_v4; + p += strlen("route-filter-v4"); + return p; + } + if (strncmp(p, "route-filter-translated-v6", + strlen("route-filter-translated-v6")) + == 0) { + *val = COMMUNITY_ROUTE_FILTER_TRANSLATED_v6; + *token = community_token_route_filter_translated_v6; + p += strlen("route-filter-translated-v6"); + return p; + } + if (strncmp(p, "route-filter-v6", strlen("route-filter-v6")) + == 0) { + *val = COMMUNITY_ROUTE_FILTER_v6; + *token = community_token_route_filter_v6; + p += strlen("route-filter-v6"); + return p; + } + if (strncmp(p, "llgr-stale", strlen("llgr-stale")) + == 0) { + *val = COMMUNITY_LLGR_STALE; + *token = community_token_llgr_stale; + p += strlen("llgr-stale"); + return p; + } + if (strncmp(p, "no-llgr", strlen("no-llgr")) + == 0) { + *val = COMMUNITY_NO_LLGR; + *token = community_token_no_llgr; + p += strlen("no-llgr"); + return p; + } + if (strncmp(p, "blackhole", strlen("blackhole")) + == 0) { + *val = COMMUNITY_BLACKHOLE; + *token = community_token_blackhole; + p += strlen("blackhole"); + return p; + } + if (strncmp(p, "no-export", strlen("no-export")) == 0) { + *val = COMMUNITY_NO_EXPORT; + *token = community_token_no_export; + p += strlen("no-export"); + return p; + } + if (strncmp(p, "no-advertise", strlen("no-advertise")) == 0) { + *val = COMMUNITY_NO_ADVERTISE; + *token = community_token_no_advertise; + p += strlen("no-advertise"); + return p; + } + if (strncmp(p, "local-AS", strlen("local-AS")) == 0) { + *val = COMMUNITY_LOCAL_AS; + *token = community_token_local_as; + p += strlen("local-AS"); + return p; + } + if (strncmp(p, "no-peer", strlen("no-peer")) == 0) { + *val = COMMUNITY_NO_PEER; + *token = community_token_no_peer; + p += strlen("no-peer"); + return p; + } + + /* Unknown string. */ + *token = community_token_unknown; + return NULL; + } + + /* Community value. */ + if (isdigit((unsigned char)*p)) { + int separator = 0; + int digit = 0; + uint32_t community_low = 0; + uint32_t community_high = 0; + + if (!community_valid(p)) { + *token = community_token_unknown; + return NULL; + } + + while (isdigit((unsigned char)*p) || *p == ':') { + if (*p == ':') { + if (separator) { + *token = community_token_unknown; + return NULL; + } else { + separator = 1; + digit = 0; + + if (community_low > UINT16_MAX) { + *token = + community_token_unknown; + return NULL; + } + + community_high = community_low << 16; + community_low = 0; + } + } else { + digit = 1; + community_low *= 10; + community_low += (*p - '0'); + } + p++; + } + if (!digit) { + *token = community_token_unknown; + return NULL; + } + + *val = community_high + community_low; + *token = community_token_val; + return p; + } + *token = community_token_unknown; + return NULL; +} + +/* convert string to community structure */ +struct community *community_str2com(const char *str) +{ + struct community *com = NULL; + struct community *com_sort = NULL; + uint32_t val = 0; + enum community_token token = community_token_unknown; + + do { + str = community_gettoken(str, &token, &val); + + switch (token) { + case community_token_val: + case community_token_gshut: + case community_token_accept_own: + case community_token_route_filter_translated_v4: + case community_token_route_filter_v4: + case community_token_route_filter_translated_v6: + case community_token_route_filter_v6: + case community_token_llgr_stale: + case community_token_no_llgr: + case community_token_accept_own_nexthop: + case community_token_blackhole: + case community_token_no_export: + case community_token_no_advertise: + case community_token_local_as: + case community_token_no_peer: + if (com == NULL) { + com = community_new(); + com->json = NULL; + } + community_add_val(com, val); + break; + case community_token_unknown: + if (com) + community_free(&com); + return NULL; + } + } while (str); + + com_sort = community_uniq_sort(com); + community_free(&com); + + return com_sort; +} + +/* Return communities hash entry count. */ +unsigned long community_count(void) +{ + return comhash->count; +} + +/* Return communities hash. */ +struct hash *community_hash(void) +{ + return comhash; +} + +/* Initialize comminity related hash. */ +void community_init(void) +{ + comhash = + hash_create((unsigned int (*)(const void *))community_hash_make, + (bool (*)(const void *, const void *))community_cmp, + "BGP Community Hash"); +} + +static void community_hash_free(void *data) +{ + struct community *com = data; + + community_free(&com); +} + +void community_finish(void) +{ + hash_clean(comhash, community_hash_free); + hash_free(comhash); + comhash = NULL; +} + +static struct community *bgp_aggr_community_lookup( + struct bgp_aggregate *aggregate, + struct community *community) +{ + return hash_lookup(aggregate->community_hash, community); +} + +static void *bgp_aggr_community_hash_alloc(void *p) +{ + struct community *ref = (struct community *)p; + struct community *community = NULL; + + community = community_dup(ref); + return community; +} + +static void bgp_aggr_community_prepare(struct hash_bucket *hb, void *arg) +{ + struct community *hb_community = hb->data; + struct community **aggr_community = arg; + + if (*aggr_community) + *aggr_community = community_merge(*aggr_community, + hb_community); + else + *aggr_community = community_dup(hb_community); +} + +void bgp_aggr_community_remove(void *arg) +{ + struct community *community = arg; + + community_free(&community); +} + +void bgp_compute_aggregate_community(struct bgp_aggregate *aggregate, + struct community *community) +{ + bgp_compute_aggregate_community_hash(aggregate, community); + bgp_compute_aggregate_community_val(aggregate); +} + + +void bgp_compute_aggregate_community_hash(struct bgp_aggregate *aggregate, + struct community *community) +{ + struct community *aggr_community = NULL; + + if ((aggregate == NULL) || (community == NULL)) + return; + + /* Create hash if not already created. + */ + if (aggregate->community_hash == NULL) + aggregate->community_hash = hash_create( + (unsigned int (*)(const void *))community_hash_make, + (bool (*)(const void *, const void *))community_cmp, + "BGP Aggregator community hash"); + + aggr_community = bgp_aggr_community_lookup(aggregate, community); + if (aggr_community == NULL) { + /* Insert community into hash. + */ + aggr_community = hash_get(aggregate->community_hash, community, + bgp_aggr_community_hash_alloc); + } + + /* Increment reference counter. + */ + aggr_community->refcnt++; +} + +void bgp_compute_aggregate_community_val(struct bgp_aggregate *aggregate) +{ + struct community *commerge = NULL; + + if (aggregate == NULL) + return; + + /* Re-compute aggregate's community. + */ + if (aggregate->community) + community_free(&aggregate->community); + if (aggregate->community_hash && + aggregate->community_hash->count) { + hash_iterate(aggregate->community_hash, + bgp_aggr_community_prepare, + &aggregate->community); + commerge = aggregate->community; + aggregate->community = community_uniq_sort(commerge); + if (commerge) + community_free(&commerge); + } +} + + + +void bgp_remove_community_from_aggregate(struct bgp_aggregate *aggregate, + struct community *community) +{ + struct community *aggr_community = NULL; + struct community *ret_comm = NULL; + + if ((!aggregate) + || (!aggregate->community_hash) + || (!community)) + return; + + /* Look-up the community in the hash. + */ + aggr_community = bgp_aggr_community_lookup(aggregate, community); + if (aggr_community) { + aggr_community->refcnt--; + + if (aggr_community->refcnt == 0) { + ret_comm = hash_release(aggregate->community_hash, + aggr_community); + community_free(&ret_comm); + + bgp_compute_aggregate_community_val(aggregate); + } + } +} + +void bgp_remove_comm_from_aggregate_hash(struct bgp_aggregate *aggregate, + struct community *community) +{ + + struct community *aggr_community = NULL; + struct community *ret_comm = NULL; + + if ((!aggregate) + || (!aggregate->community_hash) + || (!community)) + return; + + /* Look-up the community in the hash. + */ + aggr_community = bgp_aggr_community_lookup(aggregate, community); + if (aggr_community) { + aggr_community->refcnt--; + + if (aggr_community->refcnt == 0) { + ret_comm = hash_release(aggregate->community_hash, + aggr_community); + community_free(&ret_comm); + } + } +} |