zebra/label_manager.h

   1 /*
   2  * Label Manager header
   3  *
   4  * Copyright (C) 2017 by Bingen Eguzkitza,
   5  *                       Volta Networks Inc.
   6  *
   7  * This file is part of FreeRangeRouting (FRR)
   8  *
   9  * FRR is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2, or (at your option) any
  12  * later version.
  13  *
  14  * FRR is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with FRR; see the file COPYING.  If not, write to the Free
  21  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  22  * 02111-1307, USA.
  23  */
  24
  25 #ifndef _LABEL_MANAGER_H
  26 #define _LABEL_MANAGER_H
  27
  28 #include <stdint.h>
  29
  30 #include "lib/linklist.h"
  31 #include "lib/thread.h"
  32
  33 #define NO_PROTO 0
  34
  35 /*
  36  * Label chunk struct
  37  * Client daemon which the chunk belongs to can be identified by either
  38  * proto (daemon protocol) + instance.
  39  * If the client then passes a non-empty value to keep field when it requests
  40  * for chunks, the chunks won't be garbage collected and the client will be
  41  * responsible of its release.
  42  * Otherwise, if the keep field is not set (value 0) for the chunk, it will be
  43  * automatically released when the client disconnects or when it reconnects
  44  * (in case it died unexpectedly, we can know it's the same because it will have
  45  * the same proto and instance values)
  46  */
  47 struct label_manager_chunk {
  48         u_char proto;
  49         u_short instance;
  50         u_char keep;
  51         uint32_t start;         /* First label of the chunk */
  52         uint32_t end;           /* Last label of the chunk */
  53 };
  54
  55 /*
  56  * Main label manager struct
  57  * Holds a linked list of label chunks.
  58  */
  59 struct label_manager {
  60         struct list *lc_list;
  61 };
  62
  63 bool lm_is_external;
  64
  65 int zread_relay_label_manager_request(int cmd, struct zserv *zserv);
  66 void label_manager_init(char *lm_zserv_path);
  67 struct label_manager_chunk *assign_label_chunk(u_char proto, u_short instance,
  68                                                u_char keep, uint32_t size);
  69 int release_label_chunk(u_char proto, u_short instance, uint32_t start,
  70                         uint32_t end);
  71 int release_daemon_chunks(u_char proto, u_short instance);
  72 void label_manager_close(void);
  73
  74 #endif                          /* _LABEL_MANAGER_H */