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mirror_frr/ospfd/ospf_nsm.c
David Lamparter 896014f4bc *: make consistent & update GPLv2 file headers 
The FSF's address changed, and we had a mixture of comment styles for
the GPL file header.  (The style with * at the beginning won out with
580 to 141 in existing files.)

Note: I've intentionally left intact other "variations" of the copyright
header, e.g. whether it says "Zebra", "Quagga", "FRR", or nothing.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
2017-05-15 16:37:41 +02:00

879 lines
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/*
* 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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 "command.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_bfd.h"
DEFINE_HOOK(ospf_nsm_change,
(struct ospf_neighbor *on, int state, int oldstate),
(on, state, oldstate))
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_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_neighbor *nbr;
nbr = THREAD_ARG (thread);
nbr->t_db_desc = NULL;
if (IS_DEBUG_OSPF (nsm, NSM_TIMERS))
zlog_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);
/* Send proactive ARP requests */
if (nbr->state < NSM_Exchange)
ospf_proactively_arp (nbr);
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);
/* Send proactive ARP requests */
ospf_proactively_arp (nbr);
return 0;
}
static int
nsm_twoway_received (struct ospf_neighbor *nbr)
{
int adj = nsm_should_adj (nbr);
/* Send proactive ARP requests */
if (adj)
ospf_proactively_arp (nbr);
return (adj ? 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)
{
switch (lsa->data->type)
{
case OSPF_OPAQUE_LINK_LSA:
/* Exclude type-9 LSAs that does not have the same "oi" with "nbr". */
if (nbr->oi && ospf_if_exists (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;
}
/* 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;
/* Send proactive ARP requests */
ospf_proactively_arp (nbr);
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);
/* 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);
}
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);
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);
return 0;
}
static int
nsm_exchange_done (struct ospf_neighbor *nbr)
{
if (ospf_ls_request_isempty (nbr))
return NSM_Full;
/* Send Link State Request. */
if (nbr->t_ls_req == NULL)
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;
/* Send proactive ARP requests */
ospf_proactively_arp (nbr);
}
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);
if (CHECK_FLAG (nbr->options, OSPF_OPTION_O))
UNSET_FLAG (nbr->options, OSPF_OPTION_O);
}
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)
monotime(&nbr->ts_last_progress);
else /* regression in NSM */
{
monotime(&nbr->ts_last_regress);
nbr->last_regress_str = ospf_nsm_event_str [event];
}
}
static 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);
/* Generate NeighborChange ISM event.
*
* In response to NeighborChange, DR election is rerun. The information
* from the election process is required by the router-lsa construction.
*
* Therefore, trigger the event prior to refreshing the LSAs. */
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;
}
/* 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++)
{
struct list *red_list;
struct listnode *node;
struct ospf_redist *red;
if (x == ZEBRA_ROUTE_OSPF6)
continue;
red_list = oi->ospf->redist[x];
if (!red_list)
continue;
for (ALL_LIST_ELEMENTS_RO(red_list, node, red))
ospf_external_lsa_refresh_type (oi->ospf, x, red->instance, 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_update_area (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_update_area (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;
}
else
ospf_network_lsa_update (oi);
}
}
ospf_opaque_nsm_change (nbr, old_state);
/* 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 = (uint32_t)random ();
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;
ospf_bfd_trigger_event(nbr, old_state, state);
/* Preserve old status? */
}
/* Execute NSM event process. */
int
ospf_nsm_event (struct thread *thread)
{
int event;
int next_state;
struct ospf_neighbor *nbr;
nbr = THREAD_ARG (thread);
event = THREAD_VAL (thread);
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)
{
int old_state = nbr->state;
nsm_notice_state_change (nbr, next_state, event);
nsm_change_state (nbr, next_state);
hook_call(ospf_nsm_change, nbr, next_state, old_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);
}
}
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