lm: Make relay label manager async

[mirror_frr.git] / zebra / label_manager.h

/*
 * Label Manager header
 *
 * Copyright (C) 2017 by Bingen Eguzkitza,
 *                       Volta Networks Inc.
 *
 * This file is part of FreeRangeRouting (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 FRR; see the file COPYING.  If not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifndef _LABEL_MANAGER_H
#define _LABEL_MANAGER_H

#include <stdint.h>

#include "lib/linklist.h"
#include "lib/thread.h"

#define NO_PROTO 0

/*
 * Label chunk struct
 * Client daemon which the chunk belongs to can be identified by either
 * proto (daemon protocol) + instance.
 * If the client then passes a non-empty value to keep field when it requests
 * for chunks, the chunks won't be garbage collected and the client will be
 * responsible of its release.
 * Otherwise, if the keep field is not set (value 0) for the chunk, it will be
 * automatically released when the client disconnects or when it reconnects
 * (in case it died unexpectedly, we can know it's the same because it will have
 * the same proto and instance values)
 */
struct label_manager_chunk {
	u_char proto;
	u_short instance;
	u_char keep;
	uint32_t start;		/* First label of the chunk */
	uint32_t end;		/* Last label of the chunk */
};

/*
 * Main label manager struct
 * Holds a linked list of label chunks.
 */
struct label_manager {
	struct list *lc_list;
};

bool lm_is_external;

int zread_relay_label_manager_request(int cmd, struct zserv *zserv, vrf_id_t vrf_id);
void label_manager_init(char *lm_zserv_path);
struct label_manager_chunk *assign_label_chunk(u_char proto, u_short instance,
					       u_char keep, uint32_t size);
int release_label_chunk(u_char proto, u_short instance, uint32_t start,
			uint32_t end);
int release_daemon_chunks(u_char proto, u_short instance);
void label_manager_close(void);

#endif				/* _LABEL_MANAGER_H */