isisd/isis_events.c

   1 /*
   2  * IS-IS Rout(e)ing protocol - isis_events.h
   3  *
   4  * Copyright (C) 2001,2002   Sampo Saaristo
   5  *                           Tampere University of Technology
   6  *                           Institute of Communications Engineering
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public Licenseas published by the Free
  10  * Software Foundation; either version 2 of the License, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  * 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 #include <zebra.h>
  23
  24 #include "log.h"
  25 #include "memory.h"
  26 #include "if.h"
  27 #include "linklist.h"
  28 #include "command.h"
  29 #include "thread.h"
  30 #include "hash.h"
  31 #include "prefix.h"
  32 #include "stream.h"
  33 #include "table.h"
  34
  35 #include "isisd/dict.h"
  36 #include "isisd/isis_constants.h"
  37 #include "isisd/isis_common.h"
  38 #include "isisd/isis_flags.h"
  39 #include "isisd/isis_circuit.h"
  40 #include "isisd/isis_tlv.h"
  41 #include "isisd/isis_lsp.h"
  42 #include "isisd/isis_pdu.h"
  43 #include "isisd/isis_network.h"
  44 #include "isisd/isis_misc.h"
  45 #include "isisd/isis_constants.h"
  46 #include "isisd/isis_adjacency.h"
  47 #include "isisd/isis_dr.h"
  48 #include "isisd/isisd.h"
  49 #include "isisd/isis_csm.h"
  50 #include "isisd/isis_events.h"
  51 #include "isisd/isis_spf.h"
  52
  53 /* debug isis-spf spf-events
  54  4w4d: ISIS-Spf (tlt): L2 SPF needed, new adjacency, from 0x609229F4
  55  4w4d: ISIS-Spf (tlt): L2, 0000.0000.0042.01-00 TLV contents changed, code 0x2
  56  4w4d: ISIS-Spf (tlt): L2, new LSP 0 DEAD.BEEF.0043.00-00
  57  4w5d: ISIS-Spf (tlt): L1 SPF needed, periodic SPF, from 0x6091C844
  58  4w5d: ISIS-Spf (tlt): L2 SPF needed, periodic SPF, from 0x6091C844
  59 */
  60
  61 void
  62 isis_event_circuit_state_change (struct isis_circuit *circuit,
  63                                  struct isis_area *area, int up)
  64 {
  65   area->circuit_state_changes++;
  66
  67   if (isis->debugs & DEBUG_EVENTS)
  68     zlog_debug ("ISIS-Evt (%s) circuit %s", area->area_tag,
  69                 up ? "up" : "down");
  70
  71   /*
  72    * Regenerate LSPs this affects
  73    */
  74   lsp_regenerate_schedule (area, IS_LEVEL_1 | IS_LEVEL_2, 0);
  75
  76   return;
  77 }
  78
  79 static void
  80 circuit_commence_level (struct isis_circuit *circuit, int level)
  81 {
  82   if (level == 1)
  83     {
  84       if (! circuit->is_passive)
  85         thread_add_timer(master, send_l1_psnp, circuit,
  86                          isis_jitter(circuit->psnp_interval[0], PSNP_JITTER),
  87                          &circuit->t_send_psnp[0]);
  88
  89       if (circuit->circ_type == CIRCUIT_T_BROADCAST)
  90         {
  91           thread_add_timer(master, isis_run_dr_l1, circuit,
  92                            2 * circuit->hello_interval[0],
  93                            &circuit->u.bc.t_run_dr[0]);
  94
  95           thread_add_timer(master, send_lan_l1_hello, circuit,
  96                            isis_jitter(circuit->hello_interval[0], IIH_JITTER),
  97                            &circuit->u.bc.t_send_lan_hello[0]);
  98
  99           circuit->u.bc.lan_neighs[0] = list_new ();
 100         }
 101     }
 102   else
 103     {
 104       if (! circuit->is_passive)
 105         thread_add_timer(master, send_l2_psnp, circuit,
 106                          isis_jitter(circuit->psnp_interval[1], PSNP_JITTER),
 107                          &circuit->t_send_psnp[1]);
 108
 109       if (circuit->circ_type == CIRCUIT_T_BROADCAST)
 110         {
 111           thread_add_timer(master, isis_run_dr_l2, circuit,
 112                            2 * circuit->hello_interval[1],
 113                            &circuit->u.bc.t_run_dr[1]);
 114
 115           thread_add_timer(master, send_lan_l2_hello, circuit,
 116                            isis_jitter(circuit->hello_interval[1], IIH_JITTER),
 117                            &circuit->u.bc.t_send_lan_hello[1]);
 118
 119           circuit->u.bc.lan_neighs[1] = list_new ();
 120         }
 121     }
 122
 123   return;
 124 }
 125
 126 static void
 127 circuit_resign_level (struct isis_circuit *circuit, int level)
 128 {
 129   int idx = level - 1;
 130
 131   THREAD_TIMER_OFF (circuit->t_send_csnp[idx]);
 132   THREAD_TIMER_OFF (circuit->t_send_psnp[idx]);
 133
 134   if (circuit->circ_type == CIRCUIT_T_BROADCAST)
 135     {
 136       THREAD_TIMER_OFF (circuit->u.bc.t_send_lan_hello[idx]);
 137       THREAD_TIMER_OFF (circuit->u.bc.t_run_dr[idx]);
 138       THREAD_TIMER_OFF (circuit->u.bc.t_refresh_pseudo_lsp[idx]);
 139       circuit->lsp_regenerate_pending[idx] = 0;
 140       circuit->u.bc.run_dr_elect[idx] = 0;
 141       if (circuit->u.bc.lan_neighs[idx] != NULL) {
 142         list_delete (circuit->u.bc.lan_neighs[idx]);
 143         circuit->u.bc.lan_neighs[idx] = NULL;
 144       }
 145     }
 146
 147   return;
 148 }
 149
 150 void
 151 isis_circuit_is_type_set (struct isis_circuit *circuit, int newtype)
 152 {
 153   if (circuit->state != C_STATE_UP)
 154   {
 155     circuit->is_type = newtype;
 156     return;
 157   }
 158
 159   if (isis->debugs & DEBUG_EVENTS)
 160     zlog_debug ("ISIS-Evt (%s) circuit type change %s -> %s",
 161                circuit->area->area_tag,
 162                circuit_t2string (circuit->is_type),
 163                circuit_t2string (newtype));
 164
 165   if (circuit->is_type == newtype)
 166     return;                     /* No change */
 167
 168   if (!(newtype & circuit->area->is_type))
 169     {
 170       zlog_err ("ISIS-Evt (%s) circuit type change - invalid level %s because"
 171                 " area is %s", circuit->area->area_tag,
 172                 circuit_t2string (newtype),
 173                 circuit_t2string (circuit->area->is_type));
 174       return;
 175     }
 176
 177   if (! circuit->is_passive)
 178     {
 179       switch (circuit->is_type)
 180         {
 181         case IS_LEVEL_1:
 182           if (newtype == IS_LEVEL_2)
 183             circuit_resign_level (circuit, 1);
 184           circuit_commence_level (circuit, 2);
 185           break;
 186         case IS_LEVEL_1_AND_2:
 187           if (newtype == IS_LEVEL_1)
 188             circuit_resign_level (circuit, 2);
 189           else
 190             circuit_resign_level (circuit, 1);
 191           break;
 192         case IS_LEVEL_2:
 193           if (newtype == IS_LEVEL_1)
 194             circuit_resign_level (circuit, 2);
 195           circuit_commence_level (circuit, 1);
 196           break;
 197         default:
 198           break;
 199         }
 200     }
 201
 202   circuit->is_type = newtype;
 203   lsp_regenerate_schedule (circuit->area, IS_LEVEL_1 | IS_LEVEL_2, 0);
 204
 205   return;
 206 }
 207
 208  /* 04/18/2002 by Gwak. */
 209  /**************************************************************************
 210   *
 211   * EVENTS for LSP generation
 212   *
 213   * 1) an Adajacency or Circuit Up/Down event
 214   * 2) a chnage in Circuit metric
 215   * 3) a change in Reachable Address metric
 216   * 4) a change in manualAreaAddresses
 217   * 5) a change in systemID
 218   * 6) a change in DIS status
 219   * 7) a chnage in the waiting status
 220   *
 221   * ***********************************************************************
 222   *
 223   * current support event
 224   *
 225   * 1) Adjacency Up/Down event
 226   * 6) a change in DIS status
 227   *
 228   * ***********************************************************************/
 229
 230 void
 231 isis_event_adjacency_state_change (struct isis_adjacency *adj, int newstate)
 232 {
 233   /* adjacency state change event.
 234    * - the only proto-type was supported */
 235
 236   /* invalid arguments */
 237   if (!adj || !adj->circuit || !adj->circuit->area)
 238     return;
 239
 240   if (isis->debugs & DEBUG_EVENTS)
 241     zlog_debug ("ISIS-Evt (%s) Adjacency State change",
 242                 adj->circuit->area->area_tag);
 243
 244   /* LSP generation again */
 245   lsp_regenerate_schedule (adj->circuit->area, IS_LEVEL_1 | IS_LEVEL_2, 0);
 246
 247   return;
 248 }
 249
 250 /* events supporting code */
 251
 252 int
 253 isis_event_dis_status_change (struct thread *thread)
 254 {
 255   struct isis_circuit *circuit;
 256
 257   circuit = THREAD_ARG (thread);
 258
 259   /* invalid arguments */
 260   if (!circuit || !circuit->area)
 261     return 0;
 262   if (isis->debugs & DEBUG_EVENTS)
 263     zlog_debug ("ISIS-Evt (%s) DIS status change", circuit->area->area_tag);
 264
 265   /* LSP generation again */
 266   lsp_regenerate_schedule (circuit->area, IS_LEVEL_1 | IS_LEVEL_2, 0);
 267
 268   return 0;
 269 }
 270
 271 void
 272 isis_event_auth_failure (char *area_tag, const char *error_string, u_char *sysid)
 273 {
 274   if (isis->debugs & DEBUG_EVENTS)
 275     zlog_debug ("ISIS-Evt (%s) Authentication failure %s from %s",
 276                 area_tag, error_string, sysid_print (sysid));
 277
 278   return;
 279 }