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_lsp.h"
  41 #include "isisd/isis_pdu.h"
  42 #include "isisd/isis_network.h"
  43 #include "isisd/isis_misc.h"
  44 #include "isisd/isis_constants.h"
  45 #include "isisd/isis_adjacency.h"
  46 #include "isisd/isis_dr.h"
  47 #include "isisd/isisd.h"
  48 #include "isisd/isis_csm.h"
  49 #include "isisd/isis_events.h"
  50 #include "isisd/isis_spf.h"
  51 #include "isisd/isis_errors.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 isis_event_circuit_state_change(struct isis_circuit *circuit,
  62                                      struct isis_area *area, int up)
  63 {
  64         area->circuit_state_changes++;
  65
  66         if (isis->debugs & DEBUG_EVENTS)
  67                 zlog_debug("ISIS-Evt (%s) circuit %s", area->area_tag,
  68                            up ? "up" : "down");
  69
  70         /*
  71          * Regenerate LSPs this affects
  72          */
  73         lsp_regenerate_schedule(area, IS_LEVEL_1 | IS_LEVEL_2, 0);
  74
  75         return;
  76 }
  77
  78 static void circuit_commence_level(struct isis_circuit *circuit, int level)
  79 {
  80         if (!circuit->is_passive) {
  81                 if (level == 1) {
  82                         thread_add_timer(master, send_l1_psnp, circuit,
  83                                          isis_jitter(circuit->psnp_interval[0],
  84                                                      PSNP_JITTER),
  85                                          &circuit->t_send_psnp[0]);
  86                 } else {
  87                         thread_add_timer(master, send_l2_psnp, circuit,
  88                                          isis_jitter(circuit->psnp_interval[1],
  89                                                      PSNP_JITTER),
  90                                          &circuit->t_send_psnp[1]);
  91                 }
  92         }
  93
  94         if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
  95                 thread_add_timer(master, isis_run_dr,
  96                                  &circuit->level_arg[level - 1],
  97                                  2 * circuit->hello_interval[level - 1],
  98                                  &circuit->u.bc.t_run_dr[level - 1]);
  99
 100                 thread_add_timer(master, send_hello_cb,
 101                                  &circuit->level_arg[level - 1],
 102                                  isis_jitter(circuit->hello_interval[level - 1],
 103                                              IIH_JITTER),
 104                                  &circuit->u.bc.t_send_lan_hello[level - 1]);
 105
 106                 circuit->u.bc.lan_neighs[level - 1] = list_new();
 107         }
 108 }
 109
 110 static void circuit_resign_level(struct isis_circuit *circuit, int level)
 111 {
 112         int idx = level - 1;
 113
 114         THREAD_TIMER_OFF(circuit->t_send_csnp[idx]);
 115         THREAD_TIMER_OFF(circuit->t_send_psnp[idx]);
 116
 117         if (circuit->circ_type == CIRCUIT_T_BROADCAST) {
 118                 THREAD_TIMER_OFF(circuit->u.bc.t_send_lan_hello[idx]);
 119                 THREAD_TIMER_OFF(circuit->u.bc.t_run_dr[idx]);
 120                 THREAD_TIMER_OFF(circuit->u.bc.t_refresh_pseudo_lsp[idx]);
 121                 circuit->lsp_regenerate_pending[idx] = 0;
 122                 circuit->u.bc.run_dr_elect[idx] = 0;
 123                 if (circuit->u.bc.lan_neighs[idx] != NULL)
 124                         list_delete(&circuit->u.bc.lan_neighs[idx]);
 125         }
 126
 127         return;
 128 }
 129
 130 void isis_circuit_is_type_set(struct isis_circuit *circuit, int newtype)
 131 {
 132         if (circuit->state != C_STATE_UP) {
 133                 circuit->is_type = newtype;
 134                 return;
 135         }
 136
 137         if (isis->debugs & DEBUG_EVENTS)
 138                 zlog_debug("ISIS-Evt (%s) circuit type change %s -> %s",
 139                            circuit->area->area_tag,
 140                            circuit_t2string(circuit->is_type),
 141                            circuit_t2string(newtype));
 142
 143         if (circuit->is_type == newtype)
 144                 return; /* No change */
 145
 146         if (!(newtype & circuit->area->is_type)) {
 147                 flog_err(
 148                         EC_ISIS_CONFIG,
 149                         "ISIS-Evt (%s) circuit type change - invalid level %s because area is %s",
 150                         circuit->area->area_tag, circuit_t2string(newtype),
 151                         circuit_t2string(circuit->area->is_type));
 152                 return;
 153         }
 154
 155         if (!circuit->is_passive) {
 156                 switch (circuit->is_type) {
 157                 case IS_LEVEL_1:
 158                         if (newtype == IS_LEVEL_2)
 159                                 circuit_resign_level(circuit, 1);
 160                         circuit_commence_level(circuit, 2);
 161                         break;
 162                 case IS_LEVEL_1_AND_2:
 163                         if (newtype == IS_LEVEL_1)
 164                                 circuit_resign_level(circuit, 2);
 165                         else
 166                                 circuit_resign_level(circuit, 1);
 167                         break;
 168                 case IS_LEVEL_2:
 169                         if (newtype == IS_LEVEL_1)
 170                                 circuit_resign_level(circuit, 2);
 171                         circuit_commence_level(circuit, 1);
 172                         break;
 173                 default:
 174                         break;
 175                 }
 176         }
 177
 178         circuit->is_type = newtype;
 179         lsp_regenerate_schedule(circuit->area, IS_LEVEL_1 | IS_LEVEL_2, 0);
 180
 181         return;
 182 }
 183
 184 /* 04/18/2002 by Gwak. */
 185 /**************************************************************************
 186  *
 187  * EVENTS for LSP generation
 188  *
 189  * 1) an Adajacency or Circuit Up/Down event
 190  * 2) a chnage in Circuit metric
 191  * 3) a change in Reachable Address metric
 192  * 4) a change in manualAreaAddresses
 193  * 5) a change in systemID
 194  * 6) a change in DIS status
 195  * 7) a chnage in the waiting status
 196  *
 197  * ***********************************************************************
 198  *
 199  * current support event
 200  *
 201  * 1) Adjacency Up/Down event
 202  * 6) a change in DIS status
 203  *
 204  * ***********************************************************************/
 205
 206 /* events supporting code */
 207
 208 int isis_event_dis_status_change(struct thread *thread)
 209 {
 210         struct isis_circuit *circuit;
 211
 212         circuit = THREAD_ARG(thread);
 213
 214         /* invalid arguments */
 215         if (!circuit || !circuit->area)
 216                 return 0;
 217         if (isis->debugs & DEBUG_EVENTS)
 218                 zlog_debug("ISIS-Evt (%s) DIS status change",
 219                            circuit->area->area_tag);
 220
 221         /* LSP generation again */
 222         lsp_regenerate_schedule(circuit->area, IS_LEVEL_1 | IS_LEVEL_2, 0);
 223
 224         return 0;
 225 }
 226
 227 void isis_event_auth_failure(char *area_tag, const char *error_string,
 228                              uint8_t *sysid)
 229 {
 230         if (isis->debugs & DEBUG_EVENTS)
 231                 zlog_debug("ISIS-Evt (%s) Authentication failure %s from %s",
 232                            area_tag, error_string, sysid_print(sysid));
 233
 234         return;
 235 }