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/* zebra table Manager for routing table identifier management
* Copyright (C) 2018 6WIND
*
* This program 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 of the License, or (at your option)
* any later version.
*
* This program 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 <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "lib/log.h"
#include "lib/memory.h"
#include "lib/table.h"
#include "lib/network.h"
#include "lib/stream.h"
#include "lib/zclient.h"
#include "lib/libfrr.h"
#include "lib/vrf.h"
#include "zebra/zserv.h"
#include "zebra/zebra_vrf.h"
#include "zebra/label_manager.h" /* for NO_PROTO */
#include "zebra/table_manager.h"
#include "zebra/zebra_errors.h"
/* routing table identifiers
*
*/
#if !defined(GNU_LINUX)
/* BSD systems
*/
#else
/* Linux Systems
*/
#define RT_TABLE_ID_LOCAL 255
#define RT_TABLE_ID_MAIN 254
#define RT_TABLE_ID_DEFAULT 253
#define RT_TABLE_ID_COMPAT 252
#define RT_TABLE_ID_UNSPEC 0
#endif /* !def(GNU_LINUX) */
#define RT_TABLE_ID_UNRESERVED_MIN 1
#define RT_TABLE_ID_UNRESERVED_MAX 0xffffffff
struct table_manager tbl_mgr;
DEFINE_MGROUP(TABLE_MGR, "Table Manager");
DEFINE_MTYPE_STATIC(TABLE_MGR, TM_CHUNK, "Table Manager Chunk");
static void delete_table_chunk(void *val)
{
XFREE(MTYPE_TM_CHUNK, val);
}
/**
* Init table manager
*/
void table_manager_enable(ns_id_t ns_id)
{
if (ns_id != NS_DEFAULT)
return;
tbl_mgr.lc_list = list_new();
tbl_mgr.lc_list->del = delete_table_chunk;
hook_register(zserv_client_close, release_daemon_table_chunks);
}
/**
* Core function, assigns table chunks
*
* It first searches through the list to check if there's one available
* (previously released). Otherwise it creates and assigns a new one
*
* @param proto Daemon protocol of client, to identify the owner
* @param instance Instance, to identify the owner
* @para size Size of the table chunk
* @return Pointer to the assigned table chunk
*/
struct table_manager_chunk *assign_table_chunk(uint8_t proto, uint16_t instance,
uint32_t size)
{
struct table_manager_chunk *tmc;
struct listnode *node;
uint32_t start;
/* first check if there's one available */
for (ALL_LIST_ELEMENTS_RO(tbl_mgr.lc_list, node, tmc)) {
if (tmc->proto == NO_PROTO
&& tmc->end - tmc->start + 1 == size) {
tmc->proto = proto;
tmc->instance = instance;
return tmc;
}
}
/* otherwise create a new one */
tmc = XCALLOC(MTYPE_TM_CHUNK, sizeof(struct table_manager_chunk));
if (!tmc)
return NULL;
/* table RT IDs range are [1;252] and [256;0xffffffff]
* - check if the requested range can be within the first range,
* otherwise elect second one
* - TODO : vrf-lites have their own table identifier.
* In that case, table_id should be removed from the table range.
*/
if (list_isempty(tbl_mgr.lc_list))
start = RT_TABLE_ID_UNRESERVED_MIN;
else
start = ((struct table_manager_chunk *)listgetdata(
listtail(tbl_mgr.lc_list)))->end + 1;
#if !defined(GNU_LINUX)
/* BSD systems
*/
#else
/* Linux Systems
*/
/* if not enough room space between MIN and COMPAT,
* then begin after LOCAL
*/
if (start < RT_TABLE_ID_COMPAT && (size >
RT_TABLE_ID_COMPAT
- RT_TABLE_ID_UNRESERVED_MIN))
start = RT_TABLE_ID_LOCAL + 1;
#endif /* !def(GNU_LINUX) */
tmc->start = start;
if (RT_TABLE_ID_UNRESERVED_MAX - size + 1 < start) {
flog_err(EC_ZEBRA_TM_EXHAUSTED_IDS,
"Reached max table id. Start/Size %u/%u", start, size);
XFREE(MTYPE_TM_CHUNK, tmc);
return NULL;
}
tmc->end = tmc->start + size - 1;
tmc->proto = proto;
tmc->instance = instance;
listnode_add(tbl_mgr.lc_list, tmc);
return tmc;
}
/**
* Core function, release no longer used table chunks
*
* @param proto Daemon protocol of client, to identify the owner
* @param instance Instance, to identify the owner
* @param start First table RT ID of the chunk
* @param end Last table RT ID of the chunk
* @return 0 on success, -1 otherwise
*/
int release_table_chunk(uint8_t proto, uint16_t instance, uint32_t start,
uint32_t end)
{
struct listnode *node;
struct table_manager_chunk *tmc;
int ret = -1;
/* check that size matches */
zlog_debug("Releasing table chunk: %u - %u", start, end);
/* find chunk and disown */
for (ALL_LIST_ELEMENTS_RO(tbl_mgr.lc_list, node, tmc)) {
if (tmc->start != start)
continue;
if (tmc->end != end)
continue;
if (tmc->proto != proto || tmc->instance != instance) {
flog_err(EC_ZEBRA_TM_DAEMON_MISMATCH,
"%s: Daemon mismatch!!", __func__);
continue;
}
tmc->proto = NO_PROTO;
tmc->instance = 0;
ret = 0;
break;
}
if (ret != 0)
flog_err(EC_ZEBRA_TM_UNRELEASED_CHUNK,
"%s: Table chunk not released!!", __func__);
return ret;
}
/**
* Release table chunks from a client.
*
* Called on client disconnection or reconnection. It only releases chunks
* with empty keep value.
*
* @param client the client to release chunks from
* @return Number of chunks released
*/
int release_daemon_table_chunks(struct zserv *client)
{
uint8_t proto = client->proto;
uint16_t instance = client->instance;
struct listnode *node;
struct table_manager_chunk *tmc;
int count = 0;
int ret;
for (ALL_LIST_ELEMENTS_RO(tbl_mgr.lc_list, node, tmc)) {
if (tmc->proto == proto && tmc->instance == instance) {
ret = release_table_chunk(tmc->proto, tmc->instance,
tmc->start, tmc->end);
if (ret == 0)
count++;
}
}
zlog_debug("%s: Released %d table chunks", __func__, count);
return count;
}
void table_manager_disable(ns_id_t ns_id)
{
if (ns_id != NS_DEFAULT)
return;
list_delete(&tbl_mgr.lc_list);
}
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