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bgpd: Code to handle BGP aggregate's communities.

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With this commit:
1) The code to manage the communities attribute of the routes that are
   aggregatable under a configured aggregate-address is introduced.
2) The code to compute the aggregate-route's communities attribute is
   introduced.

Signed-off-by: NaveenThanikachalam <nthanikachal@vmware.com>
This commit is contained in:
Naveen Thanikachalam 2019-02-06 06:28:18 -08:00
parent e00d800877
commit c0d7a6ccb9
2 changed files with 115 additions and 0 deletions
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109
bgpd/bgp_community.c
View File

@ -910,3 +910,112 @@ void community_finish(void)
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_communty_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_backet *hb, void *arg)
{
struct community *commerge = NULL;
struct community *hb_community = hb->data;
struct community **aggr_community = arg;
if (*aggr_community) {
commerge = community_merge(*aggr_community, hb_community);
*aggr_community = community_uniq_sort(commerge);
community_free(&commerge);
} 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)
{
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 (*)(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_communty_hash_alloc);
/* Re-compute aggregate's community.
*/
if (aggregate->community)
community_free(&aggregate->community);
hash_iterate(aggregate->community_hash,
bgp_aggr_community_prepare,
&aggregate->community);
}
/* Increment refernce counter.
*/
aggr_community->refcnt++;
}
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 == NULL) || (community == NULL))
return;
if (aggregate->community_hash == NULL)
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);
community_free(&aggregate->community);
/* Compute aggregate's community.
*/
hash_iterate(aggregate->community_hash,
bgp_aggr_community_prepare,
&aggregate->community);
}
}
}

6
bgpd/bgp_community.h
View File

@ -22,6 +22,7 @@
#define _QUAGGA_BGP_COMMUNITY_H
#include "lib/json.h"
#include "bgpd/bgp_route.h"
/* Communities attribute. */
struct community {
@ -89,5 +90,10 @@ extern void community_del_val(struct community *, uint32_t *);
extern unsigned long community_count(void);
extern struct hash *community_hash(void);
extern uint32_t community_val_get(struct community *com, int i);
extern void bgp_compute_aggregate_community(struct bgp_aggregate *aggregate,
struct community *community);
extern void bgp_remove_community_from_aggregate(struct bgp_aggregate *aggregate,
struct community *community);
extern void bgp_aggr_community_remove(void *arg);
#endif /* _QUAGGA_BGP_COMMUNITY_H */