ospfd/ospf_ism.h

   1 /*
   2  * OSPF version 2  Interface State Machine.
   3  *   From RFC2328 [OSPF Version 2]
   4  * Copyright (C) 1999 Toshiaki Takada
   5  *
   6  * This file is part of GNU Zebra.
   7  *
   8  * GNU Zebra is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2, or (at your option) any
  11  * later version.
  12  *
  13  * GNU Zebra is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; see the file COPYING; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #ifndef _ZEBRA_OSPF_ISM_H
  24 #define _ZEBRA_OSPF_ISM_H
  25
  26 #include "hook.h"
  27
  28 /* OSPF Interface State Machine Status. */
  29 #define ISM_DependUpon                    0
  30 #define ISM_Down                          1
  31 #define ISM_Loopback                      2
  32 #define ISM_Waiting                       3
  33 #define ISM_PointToPoint                  4
  34 #define ISM_DROther                       5
  35 #define ISM_Backup                        6
  36 #define ISM_DR                            7
  37 #define OSPF_ISM_STATE_MAX                8
  38
  39 /* OSPF Interface State Machine Event. */
  40 #define ISM_NoEvent                       0
  41 #define ISM_InterfaceUp                   1
  42 #define ISM_WaitTimer                     2
  43 #define ISM_BackupSeen                    3
  44 #define ISM_NeighborChange                4
  45 #define ISM_LoopInd                       5
  46 #define ISM_UnloopInd                     6
  47 #define ISM_InterfaceDown                 7
  48 #define OSPF_ISM_EVENT_MAX                8
  49
  50 #define OSPF_ISM_WRITE_ON(O)                                                   \
  51         do {                                                                   \
  52                 if (oi->on_write_q == 0) {                                     \
  53                         listnode_add((O)->oi_write_q, oi);                     \
  54                         oi->on_write_q = 1;                                    \
  55                 }                                                              \
  56                 thread_add_write(master, ospf_write, (O), (O)->fd,             \
  57                                  &(O)->t_write);                               \
  58         } while (0)
  59
  60 /* Macro for OSPF ISM timer turn on. */
  61 #define OSPF_ISM_TIMER_ON(T, F, V) thread_add_timer(master, (F), oi, (V), &(T))
  62
  63 #define OSPF_ISM_TIMER_MSEC_ON(T, F, V)                                        \
  64         thread_add_timer_msec(master, (F), oi, (V), &(T))
  65
  66 /* convenience macro to set hello timer correctly, according to
  67  * whether fast-hello is set or not
  68  */
  69 #define OSPF_HELLO_TIMER_ON(O)                                                 \
  70         do {                                                                   \
  71                 if (OSPF_IF_PARAM((O), fast_hello))                            \
  72                         OSPF_ISM_TIMER_MSEC_ON(                                \
  73                                 (O)->t_hello, ospf_hello_timer,                \
  74                                 1000 / OSPF_IF_PARAM((O), fast_hello));        \
  75                 else                                                           \
  76                         OSPF_ISM_TIMER_ON((O)->t_hello, ospf_hello_timer,      \
  77                                           OSPF_IF_PARAM((O), v_hello));        \
  78         } while (0)
  79
  80 /* Macro for OSPF ISM timer turn off. */
  81 #define OSPF_ISM_TIMER_OFF(X)                                                  \
  82         do {                                                                   \
  83                 if (X) {                                                       \
  84                         thread_cancel(X);                                      \
  85                         (X) = NULL;                                            \
  86                 }                                                              \
  87         } while (0)
  88
  89 /* Macro for OSPF schedule event. */
  90 #define OSPF_ISM_EVENT_SCHEDULE(I, E)                                          \
  91         thread_add_event(master, ospf_ism_event, (I), (E), NULL)
  92
  93 /* Macro for OSPF execute event. */
  94 #define OSPF_ISM_EVENT_EXECUTE(I, E)                                           \
  95         thread_execute(master, ospf_ism_event, (I), (E))
  96
  97 /* Prototypes. */
  98 extern int ospf_ism_event(struct thread *);
  99 extern void ism_change_status(struct ospf_interface *, int);
 100 extern int ospf_hello_timer(struct thread *thread);
 101
 102 DECLARE_HOOK(ospf_ism_change,
 103              (struct ospf_interface * oi, int state, int oldstate),
 104              (oi, state, oldstate))
 105
 106 #endif /* _ZEBRA_OSPF_ISM_H */