| /* |
| * OSPF version 2 Neighbor State Machine |
| * From RFC2328 [OSPF Version 2] |
| * Copyright (C) 1999, 2000 Toshiaki Takada |
| * |
| * This file is part of GNU Zebra. |
| * |
| * GNU Zebra is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2, or (at your option) any |
| * later version. |
| * |
| * GNU Zebra is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GNU Zebra; see the file COPYING. If not, write to the Free |
| * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| * 02111-1307, USA. |
| */ |
| |
| #include <zebra.h> |
| |
| #include "thread.h" |
| #include "memory.h" |
| #include "hash.h" |
| #include "linklist.h" |
| #include "prefix.h" |
| #include "if.h" |
| #include "table.h" |
| #include "stream.h" |
| #include "table.h" |
| #include "log.h" |
| |
| #include "ospfd/ospfd.h" |
| #include "ospfd/ospf_interface.h" |
| #include "ospfd/ospf_ism.h" |
| #include "ospfd/ospf_asbr.h" |
| #include "ospfd/ospf_lsa.h" |
| #include "ospfd/ospf_lsdb.h" |
| #include "ospfd/ospf_neighbor.h" |
| #include "ospfd/ospf_nsm.h" |
| #include "ospfd/ospf_network.h" |
| #include "ospfd/ospf_packet.h" |
| #include "ospfd/ospf_dump.h" |
| #include "ospfd/ospf_flood.h" |
| #include "ospfd/ospf_abr.h" |
| #include "ospfd/ospf_snmp.h" |
| |
| static void nsm_clear_adj (struct ospf_neighbor *); |
| |
| /* OSPF NSM Timer functions. */ |
| static int |
| ospf_inactivity_timer (struct thread *thread) |
| { |
| struct ospf_neighbor *nbr; |
| |
| nbr = THREAD_ARG (thread); |
| nbr->t_inactivity = NULL; |
| |
| if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) |
| zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Inactivity timer expire)", |
| IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); |
| |
| OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_InactivityTimer); |
| |
| return 0; |
| } |
| |
| static int |
| ospf_db_desc_timer (struct thread *thread) |
| { |
| struct ospf_interface *oi; |
| struct ospf_neighbor *nbr; |
| |
| nbr = THREAD_ARG (thread); |
| nbr->t_db_desc = NULL; |
| |
| oi = nbr->oi; |
| |
| if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) |
| zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (DD Retransmit timer expire)", |
| IF_NAME (nbr->oi), inet_ntoa (nbr->src)); |
| |
| /* resent last send DD packet. */ |
| assert (nbr->last_send); |
| ospf_db_desc_resend (nbr); |
| |
| /* DD Retransmit timer set. */ |
| OSPF_NSM_TIMER_ON (nbr->t_db_desc, ospf_db_desc_timer, nbr->v_db_desc); |
| |
| return 0; |
| } |
| |
| /* Hook function called after ospf NSM event is occured. |
| * |
| * Set/clear any timers whose condition is implicit to the neighbour |
| * state. There may be other timers which are set/unset according to other |
| * state. |
| * |
| * We rely on this function to properly clear timers in lower states, |
| * particularly before deleting a neighbour. |
| */ |
| static void |
| nsm_timer_set (struct ospf_neighbor *nbr) |
| { |
| switch (nbr->state) |
| { |
| case NSM_Deleted: |
| case NSM_Down: |
| OSPF_NSM_TIMER_OFF (nbr->t_inactivity); |
| OSPF_NSM_TIMER_OFF (nbr->t_hello_reply); |
| case NSM_Attempt: |
| case NSM_Init: |
| case NSM_TwoWay: |
| OSPF_NSM_TIMER_OFF (nbr->t_db_desc); |
| OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); |
| OSPF_NSM_TIMER_OFF (nbr->t_ls_req); |
| break; |
| case NSM_ExStart: |
| OSPF_NSM_TIMER_ON (nbr->t_db_desc, ospf_db_desc_timer, nbr->v_db_desc); |
| OSPF_NSM_TIMER_OFF (nbr->t_ls_upd); |
| OSPF_NSM_TIMER_OFF (nbr->t_ls_req); |
| break; |
| case NSM_Exchange: |
| OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); |
| if (!IS_SET_DD_MS (nbr->dd_flags)) |
| OSPF_NSM_TIMER_OFF (nbr->t_db_desc); |
| break; |
| case NSM_Loading: |
| case NSM_Full: |
| default: |
| OSPF_NSM_TIMER_OFF (nbr->t_db_desc); |
| break; |
| } |
| } |
| |
| /* 10.4 of RFC2328, indicate whether an adjacency is appropriate with |
| * the given neighbour |
| */ |
| static int |
| nsm_should_adj (struct ospf_neighbor *nbr) |
| { |
| struct ospf_interface *oi = nbr->oi; |
| |
| /* These network types must always form adjacencies. */ |
| if (oi->type == OSPF_IFTYPE_POINTOPOINT |
| || oi->type == OSPF_IFTYPE_POINTOMULTIPOINT |
| || oi->type == OSPF_IFTYPE_VIRTUALLINK |
| /* Router itself is the DRouter or the BDRouter. */ |
| || IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi)) |
| || IPV4_ADDR_SAME (&oi->address->u.prefix4, &BDR (oi)) |
| /* Neighboring Router is the DRouter or the BDRouter. */ |
| || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &DR (oi)) |
| || IPV4_ADDR_SAME (&nbr->address.u.prefix4, &BDR (oi))) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* OSPF NSM functions. */ |
| static int |
| nsm_packet_received (struct ospf_neighbor *nbr) |
| { |
| /* Start or Restart Inactivity Timer. */ |
| OSPF_NSM_TIMER_OFF (nbr->t_inactivity); |
| |
| OSPF_NSM_TIMER_ON (nbr->t_inactivity, ospf_inactivity_timer, |
| nbr->v_inactivity); |
| |
| if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma) |
| OSPF_POLL_TIMER_OFF (nbr->nbr_nbma->t_poll); |
| |
| return 0; |
| } |
| |
| static int |
| nsm_start (struct ospf_neighbor *nbr) |
| { |
| if (nbr->nbr_nbma) |
| OSPF_POLL_TIMER_OFF (nbr->nbr_nbma->t_poll); |
| |
| OSPF_NSM_TIMER_OFF (nbr->t_inactivity); |
| |
| OSPF_NSM_TIMER_ON (nbr->t_inactivity, ospf_inactivity_timer, |
| nbr->v_inactivity); |
| |
| return 0; |
| } |
| |
| static int |
| nsm_twoway_received (struct ospf_neighbor *nbr) |
| { |
| return (nsm_should_adj (nbr) ? NSM_ExStart : NSM_TwoWay); |
| } |
| |
| int |
| ospf_db_summary_count (struct ospf_neighbor *nbr) |
| { |
| return ospf_lsdb_count_all (&nbr->db_sum); |
| } |
| |
| int |
| ospf_db_summary_isempty (struct ospf_neighbor *nbr) |
| { |
| return ospf_lsdb_isempty (&nbr->db_sum); |
| } |
| |
| static int |
| ospf_db_summary_add (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) |
| { |
| #ifdef HAVE_OPAQUE_LSA |
| switch (lsa->data->type) |
| { |
| case OSPF_OPAQUE_LINK_LSA: |
| /* Exclude type-9 LSAs that does not have the same "oi" with "nbr". */ |
| if (lsa->oi != nbr->oi) |
| return 0; |
| break; |
| case OSPF_OPAQUE_AREA_LSA: |
| /* |
| * It is assured by the caller function "nsm_negotiation_done()" |
| * that every given LSA belongs to the same area with "nbr". |
| */ |
| break; |
| case OSPF_OPAQUE_AS_LSA: |
| default: |
| break; |
| } |
| #endif /* HAVE_OPAQUE_LSA */ |
| |
| /* Stay away from any Local Translated Type-7 LSAs */ |
| if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) |
| return 0; |
| |
| if (IS_LSA_MAXAGE (lsa)) |
| ospf_ls_retransmit_add (nbr, lsa); |
| else |
| ospf_lsdb_add (&nbr->db_sum, lsa); |
| |
| return 0; |
| } |
| |
| void |
| ospf_db_summary_clear (struct ospf_neighbor *nbr) |
| { |
| struct ospf_lsdb *lsdb; |
| int i; |
| |
| lsdb = &nbr->db_sum; |
| for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) |
| { |
| struct route_table *table = lsdb->type[i].db; |
| struct route_node *rn; |
| |
| for (rn = route_top (table); rn; rn = route_next (rn)) |
| if (rn->info) |
| ospf_lsdb_delete (&nbr->db_sum, rn->info); |
| } |
| } |
| |
| |
| |
| /* The area link state database consists of the router-LSAs, |
| network-LSAs and summary-LSAs contained in the area structure, |
| along with the AS-external-LSAs contained in the global structure. |
| AS-external-LSAs are omitted from a virtual neighbor's Database |
| summary list. AS-external-LSAs are omitted from the Database |
| summary list if the area has been configured as a stub. */ |
| static int |
| nsm_negotiation_done (struct ospf_neighbor *nbr) |
| { |
| struct ospf_area *area = nbr->oi->area; |
| struct ospf_lsa *lsa; |
| struct route_node *rn; |
| |
| LSDB_LOOP (ROUTER_LSDB (area), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| LSDB_LOOP (NETWORK_LSDB (area), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| LSDB_LOOP (SUMMARY_LSDB (area), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| LSDB_LOOP (ASBR_SUMMARY_LSDB (area), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| |
| #ifdef HAVE_OPAQUE_LSA |
| /* Process only if the neighbor is opaque capable. */ |
| if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) |
| { |
| LSDB_LOOP (OPAQUE_LINK_LSDB (area), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| LSDB_LOOP (OPAQUE_AREA_LSDB (area), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| } |
| #endif /* HAVE_OPAQUE_LSA */ |
| |
| if (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) |
| { |
| LSDB_LOOP (NSSA_LSDB (area), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| } |
| |
| if (nbr->oi->type != OSPF_IFTYPE_VIRTUALLINK |
| && area->external_routing == OSPF_AREA_DEFAULT) |
| LSDB_LOOP (EXTERNAL_LSDB (nbr->oi->ospf), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| |
| #ifdef HAVE_OPAQUE_LSA |
| if (CHECK_FLAG (nbr->options, OSPF_OPTION_O) |
| && (nbr->oi->type != OSPF_IFTYPE_VIRTUALLINK |
| && area->external_routing == OSPF_AREA_DEFAULT)) |
| LSDB_LOOP (OPAQUE_AS_LSDB (nbr->oi->ospf), rn, lsa) |
| ospf_db_summary_add (nbr, lsa); |
| #endif /* HAVE_OPAQUE_LSA */ |
| |
| return 0; |
| } |
| |
| static int |
| nsm_exchange_done (struct ospf_neighbor *nbr) |
| { |
| if (ospf_ls_request_isempty (nbr)) |
| return NSM_Full; |
| |
| /* Send Link State Request. */ |
| ospf_ls_req_send (nbr); |
| |
| return NSM_Loading; |
| } |
| |
| static int |
| nsm_adj_ok (struct ospf_neighbor *nbr) |
| { |
| int next_state = nbr->state; |
| int adj = nsm_should_adj (nbr); |
| |
| if (nbr->state == NSM_TwoWay && adj == 1) |
| next_state = NSM_ExStart; |
| else if (nbr->state >= NSM_ExStart && adj == 0) |
| next_state = NSM_TwoWay; |
| |
| return next_state; |
| } |
| |
| /* Clear adjacency related state for a neighbour, intended where nbr |
| * transitions from > ExStart (i.e. a Full or forming adjacency) |
| * to <= ExStart. |
| */ |
| static void |
| nsm_clear_adj (struct ospf_neighbor *nbr) |
| { |
| /* Clear Database Summary list. */ |
| if (!ospf_db_summary_isempty (nbr)) |
| ospf_db_summary_clear (nbr); |
| |
| /* Clear Link State Request list. */ |
| if (!ospf_ls_request_isempty (nbr)) |
| ospf_ls_request_delete_all (nbr); |
| |
| /* Clear Link State Retransmission list. */ |
| if (!ospf_ls_retransmit_isempty (nbr)) |
| ospf_ls_retransmit_clear (nbr); |
| |
| #ifdef HAVE_OPAQUE_LSA |
| if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) |
| UNSET_FLAG (nbr->options, OSPF_OPTION_O); |
| #endif /* HAVE_OPAQUE_LSA */ |
| } |
| |
| static int |
| nsm_kill_nbr (struct ospf_neighbor *nbr) |
| { |
| /* killing nbr_self is invalid */ |
| if (nbr == nbr->oi->nbr_self) |
| { |
| assert (nbr != nbr->oi->nbr_self); |
| return 0; |
| } |
| |
| if (nbr->oi->type == OSPF_IFTYPE_NBMA && nbr->nbr_nbma != NULL) |
| { |
| struct ospf_nbr_nbma *nbr_nbma = nbr->nbr_nbma; |
| |
| nbr_nbma->nbr = NULL; |
| nbr_nbma->state_change = nbr->state_change; |
| |
| nbr->nbr_nbma = NULL; |
| |
| OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, |
| nbr_nbma->v_poll); |
| |
| if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) |
| zlog_debug ("NSM[%s:%s]: Down (PollIntervalTimer scheduled)", |
| IF_NAME (nbr->oi), inet_ntoa (nbr->address.u.prefix4)); |
| } |
| |
| return 0; |
| } |
| |
| /* Neighbor State Machine */ |
| struct { |
| int (*func) (struct ospf_neighbor *); |
| int next_state; |
| } NSM [OSPF_NSM_STATE_MAX][OSPF_NSM_EVENT_MAX] = |
| { |
| { |
| /* DependUpon: dummy state. */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { NULL, NSM_DependUpon }, /* PacketReceived */ |
| { NULL, NSM_DependUpon }, /* Start */ |
| { NULL, NSM_DependUpon }, /* 2-WayReceived */ |
| { NULL, NSM_DependUpon }, /* NegotiationDone */ |
| { NULL, NSM_DependUpon }, /* ExchangeDone */ |
| { NULL, NSM_DependUpon }, /* BadLSReq */ |
| { NULL, NSM_DependUpon }, /* LoadingDone */ |
| { NULL, NSM_DependUpon }, /* AdjOK? */ |
| { NULL, NSM_DependUpon }, /* SeqNumberMismatch */ |
| { NULL, NSM_DependUpon }, /* 1-WayReceived */ |
| { NULL, NSM_DependUpon }, /* KillNbr */ |
| { NULL, NSM_DependUpon }, /* InactivityTimer */ |
| { NULL, NSM_DependUpon }, /* LLDown */ |
| }, |
| { |
| /* Deleted: dummy state. */ |
| { NULL, NSM_Deleted }, /* NoEvent */ |
| { NULL, NSM_Deleted }, /* PacketReceived */ |
| { NULL, NSM_Deleted }, /* Start */ |
| { NULL, NSM_Deleted }, /* 2-WayReceived */ |
| { NULL, NSM_Deleted }, /* NegotiationDone */ |
| { NULL, NSM_Deleted }, /* ExchangeDone */ |
| { NULL, NSM_Deleted }, /* BadLSReq */ |
| { NULL, NSM_Deleted }, /* LoadingDone */ |
| { NULL, NSM_Deleted }, /* AdjOK? */ |
| { NULL, NSM_Deleted }, /* SeqNumberMismatch */ |
| { NULL, NSM_Deleted }, /* 1-WayReceived */ |
| { NULL, NSM_Deleted }, /* KillNbr */ |
| { NULL, NSM_Deleted }, /* InactivityTimer */ |
| { NULL, NSM_Deleted }, /* LLDown */ |
| }, |
| { |
| /* Down: */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
| { nsm_start, NSM_Attempt }, /* Start */ |
| { NULL, NSM_Down }, /* 2-WayReceived */ |
| { NULL, NSM_Down }, /* NegotiationDone */ |
| { NULL, NSM_Down }, /* ExchangeDone */ |
| { NULL, NSM_Down }, /* BadLSReq */ |
| { NULL, NSM_Down }, /* LoadingDone */ |
| { NULL, NSM_Down }, /* AdjOK? */ |
| { NULL, NSM_Down }, /* SeqNumberMismatch */ |
| { NULL, NSM_Down }, /* 1-WayReceived */ |
| { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
| { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
| { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ |
| }, |
| { |
| /* Attempt: */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
| { NULL, NSM_Attempt }, /* Start */ |
| { NULL, NSM_Attempt }, /* 2-WayReceived */ |
| { NULL, NSM_Attempt }, /* NegotiationDone */ |
| { NULL, NSM_Attempt }, /* ExchangeDone */ |
| { NULL, NSM_Attempt }, /* BadLSReq */ |
| { NULL, NSM_Attempt }, /* LoadingDone */ |
| { NULL, NSM_Attempt }, /* AdjOK? */ |
| { NULL, NSM_Attempt }, /* SeqNumberMismatch */ |
| { NULL, NSM_Attempt }, /* 1-WayReceived */ |
| { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
| { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
| { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ |
| }, |
| { |
| /* Init: */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { nsm_packet_received, NSM_Init }, /* PacketReceived */ |
| { NULL, NSM_Init }, /* Start */ |
| { nsm_twoway_received, NSM_DependUpon }, /* 2-WayReceived */ |
| { NULL, NSM_Init }, /* NegotiationDone */ |
| { NULL, NSM_Init }, /* ExchangeDone */ |
| { NULL, NSM_Init }, /* BadLSReq */ |
| { NULL, NSM_Init }, /* LoadingDone */ |
| { NULL, NSM_Init }, /* AdjOK? */ |
| { NULL, NSM_Init }, /* SeqNumberMismatch */ |
| { NULL, NSM_Init }, /* 1-WayReceived */ |
| { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
| { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
| { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ |
| }, |
| { |
| /* 2-Way: */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { nsm_packet_received, NSM_TwoWay }, /* HelloReceived */ |
| { NULL, NSM_TwoWay }, /* Start */ |
| { NULL, NSM_TwoWay }, /* 2-WayReceived */ |
| { NULL, NSM_TwoWay }, /* NegotiationDone */ |
| { NULL, NSM_TwoWay }, /* ExchangeDone */ |
| { NULL, NSM_TwoWay }, /* BadLSReq */ |
| { NULL, NSM_TwoWay }, /* LoadingDone */ |
| { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
| { NULL, NSM_TwoWay }, /* SeqNumberMismatch */ |
| { NULL, NSM_Init }, /* 1-WayReceived */ |
| { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
| { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
| { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ |
| }, |
| { |
| /* ExStart: */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { nsm_packet_received, NSM_ExStart }, /* PacaketReceived */ |
| { NULL, NSM_ExStart }, /* Start */ |
| { NULL, NSM_ExStart }, /* 2-WayReceived */ |
| { nsm_negotiation_done, NSM_Exchange }, /* NegotiationDone */ |
| { NULL, NSM_ExStart }, /* ExchangeDone */ |
| { NULL, NSM_ExStart }, /* BadLSReq */ |
| { NULL, NSM_ExStart }, /* LoadingDone */ |
| { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
| { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
| { NULL, NSM_Init }, /* 1-WayReceived */ |
| { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
| { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
| { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ |
| }, |
| { |
| /* Exchange: */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { nsm_packet_received, NSM_Exchange }, /* PacketReceived */ |
| { NULL, NSM_Exchange }, /* Start */ |
| { NULL, NSM_Exchange }, /* 2-WayReceived */ |
| { NULL, NSM_Exchange }, /* NegotiationDone */ |
| { nsm_exchange_done, NSM_DependUpon }, /* ExchangeDone */ |
| { NULL, NSM_ExStart }, /* BadLSReq */ |
| { NULL, NSM_Exchange }, /* LoadingDone */ |
| { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
| { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
| { NULL, NSM_Init }, /* 1-WayReceived */ |
| { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
| { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
| { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ |
| }, |
| { |
| /* Loading: */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { nsm_packet_received, NSM_Loading }, /* PacketReceived */ |
| { NULL, NSM_Loading }, /* Start */ |
| { NULL, NSM_Loading }, /* 2-WayReceived */ |
| { NULL, NSM_Loading }, /* NegotiationDone */ |
| { NULL, NSM_Loading }, /* ExchangeDone */ |
| { NULL, NSM_ExStart }, /* BadLSReq */ |
| { NULL, NSM_Full }, /* LoadingDone */ |
| { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
| { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
| { NULL, NSM_Init }, /* 1-WayReceived */ |
| { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
| { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
| { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ |
| }, |
| { /* Full: */ |
| { NULL, NSM_DependUpon }, /* NoEvent */ |
| { nsm_packet_received, NSM_Full }, /* PacketReceived */ |
| { NULL, NSM_Full }, /* Start */ |
| { NULL, NSM_Full }, /* 2-WayReceived */ |
| { NULL, NSM_Full }, /* NegotiationDone */ |
| { NULL, NSM_Full }, /* ExchangeDone */ |
| { NULL, NSM_ExStart }, /* BadLSReq */ |
| { NULL, NSM_Full }, /* LoadingDone */ |
| { nsm_adj_ok, NSM_DependUpon }, /* AdjOK? */ |
| { NULL, NSM_ExStart }, /* SeqNumberMismatch */ |
| { NULL, NSM_Init }, /* 1-WayReceived */ |
| { nsm_kill_nbr, NSM_Deleted }, /* KillNbr */ |
| { nsm_kill_nbr, NSM_Deleted }, /* InactivityTimer */ |
| { nsm_kill_nbr, NSM_Deleted }, /* LLDown */ |
| }, |
| }; |
| |
| static const char *ospf_nsm_event_str[] = |
| { |
| "NoEvent", |
| "PacketReceived", |
| "Start", |
| "2-WayReceived", |
| "NegotiationDone", |
| "ExchangeDone", |
| "BadLSReq", |
| "LoadingDone", |
| "AdjOK?", |
| "SeqNumberMismatch", |
| "1-WayReceived", |
| "KillNbr", |
| "InactivityTimer", |
| "LLDown", |
| }; |
| |
| static void |
| nsm_notice_state_change (struct ospf_neighbor *nbr, int next_state, int event) |
| { |
| /* Logging change of status. */ |
| if (IS_DEBUG_OSPF (nsm, NSM_STATUS)) |
| zlog_debug ("NSM[%s:%s]: State change %s -> %s (%s)", |
| IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), |
| LOOKUP (ospf_nsm_state_msg, nbr->state), |
| LOOKUP (ospf_nsm_state_msg, next_state), |
| ospf_nsm_event_str [event]); |
| |
| /* Optionally notify about adjacency changes */ |
| if (CHECK_FLAG(nbr->oi->ospf->config, OSPF_LOG_ADJACENCY_CHANGES) && |
| (CHECK_FLAG(nbr->oi->ospf->config, OSPF_LOG_ADJACENCY_DETAIL) || |
| (next_state == NSM_Full) || (next_state < nbr->state))) |
| zlog_notice("AdjChg: Nbr %s on %s: %s -> %s (%s)", |
| inet_ntoa (nbr->router_id), IF_NAME (nbr->oi), |
| LOOKUP (ospf_nsm_state_msg, nbr->state), |
| LOOKUP (ospf_nsm_state_msg, next_state), |
| ospf_nsm_event_str [event]); |
| |
| /* Advance in NSM */ |
| if (next_state > nbr->state) |
| nbr->ts_last_progress = recent_relative_time (); |
| else /* regression in NSM */ |
| { |
| nbr->ts_last_regress = recent_relative_time (); |
| nbr->last_regress_str = ospf_nsm_event_str [event]; |
| } |
| |
| #ifdef HAVE_SNMP |
| /* Terminal state or regression */ |
| if ((next_state == NSM_Full) |
| || (next_state == NSM_TwoWay) |
| || (next_state < nbr->state)) |
| { |
| /* ospfVirtNbrStateChange */ |
| if (nbr->oi->type == OSPF_IFTYPE_VIRTUALLINK) |
| ospfTrapVirtNbrStateChange(nbr); |
| /* ospfNbrStateChange trap */ |
| else |
| /* To/From FULL, only managed by DR */ |
| if (((next_state != NSM_Full) && (nbr->state != NSM_Full)) |
| || (nbr->oi->state == ISM_DR)) |
| ospfTrapNbrStateChange(nbr); |
| } |
| #endif |
| } |
| |
| void |
| nsm_change_state (struct ospf_neighbor *nbr, int state) |
| { |
| struct ospf_interface *oi = nbr->oi; |
| struct ospf_area *vl_area = NULL; |
| u_char old_state; |
| int x; |
| int force = 1; |
| |
| /* Preserve old status. */ |
| old_state = nbr->state; |
| |
| /* Change to new status. */ |
| nbr->state = state; |
| |
| /* Statistics. */ |
| nbr->state_change++; |
| |
| if (oi->type == OSPF_IFTYPE_VIRTUALLINK) |
| vl_area = ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id); |
| |
| /* One of the neighboring routers changes to/from the FULL state. */ |
| if ((old_state != NSM_Full && state == NSM_Full) || |
| (old_state == NSM_Full && state != NSM_Full)) |
| { |
| if (state == NSM_Full) |
| { |
| oi->full_nbrs++; |
| oi->area->full_nbrs++; |
| |
| ospf_check_abr_status (oi->ospf); |
| |
| if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area) |
| if (++vl_area->full_vls == 1) |
| ospf_schedule_abr_task (oi->ospf); |
| |
| /* kevinm: refresh any redistributions */ |
| for (x = ZEBRA_ROUTE_SYSTEM; x < ZEBRA_ROUTE_MAX; x++) |
| { |
| if (x == ZEBRA_ROUTE_OSPF || x == ZEBRA_ROUTE_OSPF6) |
| continue; |
| ospf_external_lsa_refresh_type (oi->ospf, x, force); |
| } |
| /* XXX: Clearly some thing is wrong with refresh of external LSAs |
| * this added to hack around defaults not refreshing after a timer |
| * jump. |
| */ |
| ospf_external_lsa_refresh_default (oi->ospf); |
| } |
| else |
| { |
| oi->full_nbrs--; |
| oi->area->full_nbrs--; |
| |
| ospf_check_abr_status (oi->ospf); |
| |
| if (oi->type == OSPF_IFTYPE_VIRTUALLINK && vl_area) |
| if (vl_area->full_vls > 0) |
| if (--vl_area->full_vls == 0) |
| ospf_schedule_abr_task (oi->ospf); |
| } |
| |
| zlog_info ("nsm_change_state(%s, %s -> %s): " |
| "scheduling new router-LSA origination", |
| inet_ntoa (nbr->router_id), |
| LOOKUP(ospf_nsm_state_msg, old_state), |
| LOOKUP(ospf_nsm_state_msg, state)); |
| |
| ospf_router_lsa_timer_add (oi->area); |
| |
| if (oi->type == OSPF_IFTYPE_VIRTUALLINK) |
| { |
| struct ospf_area *vl_area = |
| ospf_area_lookup_by_area_id (oi->ospf, oi->vl_data->vl_area_id); |
| |
| if (vl_area) |
| ospf_router_lsa_timer_add (vl_area); |
| } |
| |
| /* Originate network-LSA. */ |
| if (oi->state == ISM_DR) |
| { |
| if (oi->network_lsa_self && oi->full_nbrs == 0) |
| { |
| ospf_lsa_flush_area (oi->network_lsa_self, oi->area); |
| ospf_lsa_unlock (&oi->network_lsa_self); |
| oi->network_lsa_self = NULL; |
| OSPF_TIMER_OFF (oi->t_network_lsa_self); |
| } |
| else |
| ospf_network_lsa_timer_add (oi); |
| } |
| } |
| |
| #ifdef HAVE_OPAQUE_LSA |
| ospf_opaque_nsm_change (nbr, old_state); |
| #endif /* HAVE_OPAQUE_LSA */ |
| |
| /* State changes from > ExStart to <= ExStart should clear any Exchange |
| * or Full/LSA Update related lists and state. |
| * Potential causal events: BadLSReq, SeqNumberMismatch, AdjOK? |
| */ |
| if ((old_state > NSM_ExStart) && (state <= NSM_ExStart)) |
| nsm_clear_adj (nbr); |
| |
| /* Start DD exchange protocol */ |
| if (state == NSM_ExStart) |
| { |
| if (nbr->dd_seqnum == 0) |
| nbr->dd_seqnum = quagga_time (NULL); |
| else |
| nbr->dd_seqnum++; |
| |
| nbr->dd_flags = OSPF_DD_FLAG_I|OSPF_DD_FLAG_M|OSPF_DD_FLAG_MS; |
| ospf_db_desc_send (nbr); |
| } |
| |
| /* clear cryptographic sequence number */ |
| if (state == NSM_Down) |
| nbr->crypt_seqnum = 0; |
| |
| /* Generete NeighborChange ISM event. */ |
| switch (oi->state) { |
| case ISM_DROther: |
| case ISM_Backup: |
| case ISM_DR: |
| if ((old_state < NSM_TwoWay && state >= NSM_TwoWay) || |
| (old_state >= NSM_TwoWay && state < NSM_TwoWay)) |
| OSPF_ISM_EVENT_EXECUTE (oi, ISM_NeighborChange); |
| break; |
| default: |
| /* ISM_PointToPoint -> ISM_Down, ISM_Loopback -> ISM_Down, etc. */ |
| break; |
| } |
| |
| /* Preserve old status? */ |
| } |
| |
| /* Execute NSM event process. */ |
| int |
| ospf_nsm_event (struct thread *thread) |
| { |
| int event; |
| int next_state; |
| struct ospf_neighbor *nbr; |
| struct in_addr router_id; |
| |
| nbr = THREAD_ARG (thread); |
| event = THREAD_VAL (thread); |
| router_id = nbr->router_id; |
| |
| if (IS_DEBUG_OSPF (nsm, NSM_EVENTS)) |
| zlog_debug ("NSM[%s:%s]: %s (%s)", IF_NAME (nbr->oi), |
| inet_ntoa (nbr->router_id), |
| LOOKUP (ospf_nsm_state_msg, nbr->state), |
| ospf_nsm_event_str [event]); |
| |
| next_state = NSM [nbr->state][event].next_state; |
| |
| /* Call function. */ |
| if (NSM [nbr->state][event].func != NULL) |
| { |
| int func_state = (*(NSM [nbr->state][event].func))(nbr); |
| |
| if (NSM [nbr->state][event].next_state == NSM_DependUpon) |
| next_state = func_state; |
| else if (func_state) |
| { |
| /* There's a mismatch between the FSM tables and what an FSM |
| * action/state-change function returned. State changes which |
| * do not have conditional/DependUpon next-states should not |
| * try set next_state. |
| */ |
| zlog_warn ("NSM[%s:%s]: %s (%s): " |
| "Warning: action tried to change next_state to %s", |
| IF_NAME (nbr->oi), inet_ntoa (nbr->router_id), |
| LOOKUP (ospf_nsm_state_msg, nbr->state), |
| ospf_nsm_event_str [event], |
| LOOKUP (ospf_nsm_state_msg, func_state)); |
| } |
| } |
| |
| assert (next_state != NSM_DependUpon); |
| |
| /* If state is changed. */ |
| if (next_state != nbr->state) |
| { |
| nsm_notice_state_change (nbr, next_state, event); |
| nsm_change_state (nbr, next_state); |
| } |
| |
| /* Make sure timer is set. */ |
| nsm_timer_set (nbr); |
| |
| /* When event is NSM_KillNbr, InactivityTimer or LLDown, the neighbor |
| * is deleted. |
| * |
| * Rather than encode knowledge here of which events lead to NBR |
| * delete, we take our cue from the NSM table, via the dummy |
| * 'Deleted' neighbour state. |
| */ |
| if (nbr->state == NSM_Deleted) |
| ospf_nbr_delete (nbr); |
| |
| return 0; |
| } |
| |
| /* Check loading state. */ |
| void |
| ospf_check_nbr_loading (struct ospf_neighbor *nbr) |
| { |
| if (nbr->state == NSM_Loading) |
| { |
| if (ospf_ls_request_isempty (nbr)) |
| OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_LoadingDone); |
| else if (nbr->ls_req_last == NULL) |
| ospf_ls_req_event (nbr); |
| } |
| } |