lib/ldp_sync.c

   1 /*
   2  * ldp_sync.c: LDP-SYNC handling routines
   3  * Copyright (C) 2020 Volta Networks, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the Free
   7  * Software Foundation; either version 2 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; see the file COPYING; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include <zebra.h>
  21
  22 #include "command.h"
  23 #include "memory.h"
  24 #include "prefix.h"
  25 #include "log.h"
  26 #include "thread.h"
  27 #include "stream.h"
  28 #include "zclient.h"
  29 #include "table.h"
  30 #include "vty.h"
  31 #include "ldp_sync.h"
  32
  33 /* Library code */
  34 DEFINE_MTYPE_STATIC(LIB, LDP_SYNC_INFO, "LDP SYNC info")
  35
  36 /*
  37  * ldp_sync_info_create - Allocate the LDP_SYNC information
  38  */
  39 struct ldp_sync_info *ldp_sync_info_create(void)
  40 {
  41         struct ldp_sync_info *ldp_sync_info;
  42
  43         ldp_sync_info = XCALLOC(MTYPE_LDP_SYNC_INFO,
  44                                 sizeof(struct ldp_sync_info));
  45         assert(ldp_sync_info);
  46
  47         ldp_sync_info->flags = 0;
  48         ldp_sync_info->enabled = LDP_IGP_SYNC_DEFAULT;
  49         ldp_sync_info->state = LDP_IGP_SYNC_STATE_NOT_REQUIRED;
  50         ldp_sync_info->holddown = LDP_IGP_SYNC_HOLDDOWN_DEFAULT;
  51         ldp_sync_info->t_holddown = NULL;
  52         return ldp_sync_info;
  53 }
  54
  55 /*
  56  * ldp_sync_info_free - Free the LDP_SYNC information.
  57  */
  58 void ldp_sync_info_free(struct ldp_sync_info **ldp_sync_info)
  59 {
  60         if (*ldp_sync_info)
  61                 XFREE(MTYPE_LDP_SYNC_INFO, *ldp_sync_info);
  62 }
  63
  64 bool ldp_sync_if_is_enabled(struct ldp_sync_info *ldp_sync_info)
  65 {
  66         /* return true if LDP-SYNC is configured on this interface */
  67         if (ldp_sync_info &&
  68             ldp_sync_info->enabled == LDP_IGP_SYNC_ENABLED &&
  69             ldp_sync_info->state == LDP_IGP_SYNC_STATE_REQUIRED_NOT_UP)
  70                 return true;
  71
  72         return false;
  73 }
  74
  75 bool ldp_sync_if_down(struct ldp_sync_info *ldp_sync_info)
  76 {
  77         /* Stop LDP-SYNC on this interface:
  78          *   if holddown timer is running stop it
  79          *   update state
  80          */
  81         if (ldp_sync_info && ldp_sync_info->enabled == LDP_IGP_SYNC_ENABLED) {
  82                 THREAD_OFF(ldp_sync_info->t_holddown);
  83
  84                 if (ldp_sync_info->state == LDP_IGP_SYNC_STATE_REQUIRED_UP)
  85                         ldp_sync_info->state =
  86                                 LDP_IGP_SYNC_STATE_REQUIRED_NOT_UP;
  87                 return true;
  88         }
  89
  90         return false;
  91 }