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/* BGP community, large-community aliasing.
*
* Copyright (C) 2021 Donatas Abraitis <donatas.abraitis@gmail.com>
*
* This file is part of FRRouting (FRR).
*
* FRR 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.
*
* FRR 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 "memory.h"
#include "lib/jhash.h"
#include "frrstr.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_community_alias.h"
static struct hash *bgp_ca_alias_hash;
static struct hash *bgp_ca_community_hash;
static unsigned int bgp_ca_community_hash_key(const void *p)
{
const struct community_alias *ca = p;
return jhash(ca->community, sizeof(ca->community), 0);
}
static bool bgp_ca_community_hash_cmp(const void *p1, const void *p2)
{
const struct community_alias *ca1 = p1;
const struct community_alias *ca2 = p2;
return (strcmp(ca1->community, ca2->community) == 0);
}
static unsigned int bgp_ca_alias_hash_key(const void *p)
{
const struct community_alias *ca = p;
return jhash(ca->alias, sizeof(ca->alias), 0);
}
static bool bgp_ca_alias_hash_cmp(const void *p1, const void *p2)
{
const struct community_alias *ca1 = p1;
const struct community_alias *ca2 = p2;
return (strcmp(ca1->alias, ca2->alias) == 0);
}
static void *bgp_community_alias_alloc(void *p)
{
const struct community_alias *ca = p;
struct communtiy_alias *new;
new = XCALLOC(MTYPE_COMMUNITY_ALIAS, sizeof(struct community_alias));
memcpy(new, ca, sizeof(struct community_alias));
return new;
}
void bgp_community_alias_init(void)
{
bgp_ca_community_hash = hash_create(bgp_ca_community_hash_key,
bgp_ca_community_hash_cmp,
"BGP community alias (community)");
bgp_ca_alias_hash =
hash_create(bgp_ca_alias_hash_key, bgp_ca_alias_hash_cmp,
"BGP community alias (alias)");
}
void bgp_community_alias_finish(void)
{
hash_free(bgp_ca_community_hash);
hash_free(bgp_ca_alias_hash);
}
static void bgp_community_alias_show_iterator(struct hash_bucket *hb,
struct vty *vty)
{
struct community_alias *ca = hb->data;
vty_out(vty, "bgp community alias %s %s\n", ca->community, ca->alias);
}
int bgp_community_alias_write(struct vty *vty)
{
hash_iterate(bgp_ca_community_hash,
(void (*)(struct hash_bucket *,
void *))bgp_community_alias_show_iterator,
vty);
return 1;
}
void bgp_ca_community_insert(struct community_alias *ca)
{
(void)hash_get(bgp_ca_community_hash, ca, bgp_community_alias_alloc);
}
void bgp_ca_alias_insert(struct community_alias *ca)
{
(void)hash_get(bgp_ca_alias_hash, ca, bgp_community_alias_alloc);
}
void bgp_ca_community_delete(struct community_alias *ca)
{
struct community_alias *data = hash_release(bgp_ca_community_hash, ca);
XFREE(MTYPE_COMMUNITY_ALIAS, data);
}
void bgp_ca_alias_delete(struct community_alias *ca)
{
struct community_alias *data = hash_release(bgp_ca_alias_hash, ca);
XFREE(MTYPE_COMMUNITY_ALIAS, data);
}
struct community_alias *bgp_ca_community_lookup(struct community_alias *ca)
{
return hash_lookup(bgp_ca_community_hash, ca);
}
struct community_alias *bgp_ca_alias_lookup(struct community_alias *ca)
{
return hash_lookup(bgp_ca_alias_hash, ca);
}
const char *bgp_community2alias(char *community)
{
struct community_alias ca;
struct community_alias *find;
memset(&ca, 0, sizeof(ca));
strlcpy(ca.community, community, sizeof(ca.community));
find = bgp_ca_community_lookup(&ca);
if (find)
return find->alias;
return community;
}
const char *bgp_alias2community(char *alias)
{
struct community_alias ca;
struct community_alias *find;
memset(&ca, 0, sizeof(ca));
strlcpy(ca.alias, alias, sizeof(ca.alias));
find = bgp_ca_alias_lookup(&ca);
if (find)
return find->community;
return alias;
}
/* Communities structs have `->str` which is used
* for vty outputs and extended BGP community lists
* with regexp.
* This is a helper to convert already aliased version
* of communities into numerical-only format.
*/
char *bgp_alias2community_str(const char *str)
{
char **aliases;
char *comstr;
int num, i;
frrstr_split(str, " ", &aliases, &num);
const char *communities[num];
for (i = 0; i < num; i++)
communities[i] = bgp_alias2community(aliases[i]);
comstr = frrstr_join(communities, num, " ");
for (i = 0; i < num; i++)
XFREE(MTYPE_TMP, aliases[i]);
XFREE(MTYPE_TMP, aliases);
return comstr;
}
static int bgp_community_alias_vector_walker(struct hash_bucket *bucket,
void *data)
{
vector *comps = data;
struct community_alias *alias = bucket->data;
vector_set(*comps, XSTRDUP(MTYPE_COMPLETION, alias->alias));
return 1;
}
static void bgp_community_alias_cmd_completion(vector comps,
struct cmd_token *token)
{
hash_walk(bgp_ca_alias_hash, bgp_community_alias_vector_walker, &comps);
}
static const struct cmd_variable_handler community_alias_handlers[] = {
{.varname = "alias_name",
.completions = bgp_community_alias_cmd_completion},
{.tokenname = "ALIAS_NAME",
.completions = bgp_community_alias_cmd_completion},
{.completions = NULL}};
void bgp_community_alias_command_completion_setup(void)
{
cmd_variable_handler_register(community_alias_handlers);
}
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