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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Label Manager header
*
* Copyright (C) 2017 by Bingen Eguzkitza,
* Volta Networks Inc.
*
* This file is part of FRRouting (FRR)
*/
#ifndef _LABEL_MANAGER_H
#define _LABEL_MANAGER_H
#include <stdint.h>
#include "lib/linklist.h"
#include "frrevent.h"
#include "lib/hook.h"
#include "zebra/zserv.h"
#ifdef __cplusplus
extern "C" {
#endif
#define NO_PROTO 0
/*
* Label chunk struct
* Client daemon which the chunk belongs to can be identified by a tuple of:
* proto (daemon protocol) + instance + zapi session_id
* 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 for releasing them.
* 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+instance+session values)
*/
struct label_manager_chunk {
uint8_t proto;
unsigned short instance;
uint32_t session_id;
uint8_t keep;
uint8_t is_dynamic; /* Tell if chunk is dynamic or static */
uint32_t start; /* First label of the chunk */
uint32_t end; /* Last label of the chunk */
};
/* declare hooks for the basic API, so that it can be specialized or served
* externally. Also declare a hook when those functions have been registered,
* so that any external module wanting to replace those can react
*/
DECLARE_HOOK(lm_client_connect, (struct zserv *client, vrf_id_t vrf_id),
(client, vrf_id));
DECLARE_HOOK(lm_client_disconnect, (struct zserv *client), (client));
DECLARE_HOOK(lm_get_chunk,
(struct label_manager_chunk * *lmc, struct zserv *client,
uint8_t keep, uint32_t size, uint32_t base, vrf_id_t vrf_id),
(lmc, client, keep, size, base, vrf_id));
DECLARE_HOOK(lm_release_chunk,
(struct zserv *client, uint32_t start, uint32_t end),
(client, start, end));
DECLARE_HOOK(lm_write_label_block_config,
(struct vty *vty, struct zebra_vrf *zvrf),
(vty, zvrf));
DECLARE_HOOK(lm_cbs_inited, (), ());
/* declare wrappers to be called in zapi_msg.c or zebra_mpls_vty.c (as hooks
* must be called in source file where they were defined)
*/
void lm_client_connect_call(struct zserv *client, vrf_id_t vrf_id);
void lm_get_chunk_call(struct label_manager_chunk **lmc, struct zserv *client,
uint8_t keep, uint32_t size, uint32_t base,
vrf_id_t vrf_id);
void lm_release_chunk_call(struct zserv *client, uint32_t start,
uint32_t end);
int lm_write_label_block_config_call(struct vty *vty, struct zebra_vrf *zvrf);
/* API for an external LM to return responses for requests */
int lm_client_connect_response(uint8_t proto, uint16_t instance,
uint32_t session_id, vrf_id_t vrf_id,
uint8_t result);
/* convenience function to allocate an lmc to be consumed by the above API */
struct label_manager_chunk *
create_label_chunk(uint8_t proto, unsigned short instance, uint32_t session_id,
uint8_t keep, uint32_t start, uint32_t end, bool is_dynamic);
void delete_label_chunk(void *val);
/* register/unregister callbacks for hooks */
void lm_hooks_register(void);
void lm_hooks_unregister(void);
/*
* Main label manager struct
* Holds a linked list of label chunks.
*/
struct label_manager {
struct list *lc_list;
uint32_t dynamic_block_start;
uint32_t dynamic_block_end;
};
void label_manager_init(void);
void label_manager_terminate(void);
struct label_manager_chunk *
assign_label_chunk(uint8_t proto, unsigned short instance, uint32_t session_id,
uint8_t keep, uint32_t size, uint32_t base);
int release_label_chunk(uint8_t proto, unsigned short instance,
uint32_t session_id, uint32_t start, uint32_t end);
int lm_client_disconnect_cb(struct zserv *client);
int release_daemon_label_chunks(struct zserv *client);
void label_manager_close(void);
#ifdef __cplusplus
}
#endif
#endif /* _LABEL_MANAGER_H */
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