ospf_flood.c
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上传日期:2009-11-15
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- /*
- * OSPF Flooding -- RFC2328 Section 13.
- * 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 "linklist.h"
- #include "prefix.h"
- #include "if.h"
- #include "command.h"
- #include "table.h"
- #include "thread.h"
- #include "memory.h"
- #include "log.h"
- #include "zclient.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_spf.h"
- #include "ospfd/ospf_flood.h"
- #include "ospfd/ospf_packet.h"
- #include "ospfd/ospf_abr.h"
- #include "ospfd/ospf_route.h"
- #include "ospfd/ospf_zebra.h"
- #include "ospfd/ospf_dump.h"
- extern struct zclient *zclient;
- /* Do the LSA acking specified in table 19, Section 13.5, row 2
- * This get called from ospf_flood_out_interface. Declared inline
- * for speed. */
- static void
- ospf_flood_delayed_lsa_ack (struct ospf_neighbor *inbr, struct ospf_lsa *lsa)
- {
- /* LSA is more recent than database copy, but was not
- flooded back out receiving interface. Delayed
- acknowledgment sent. If interface is in Backup state
- delayed acknowledgment sent only if advertisement
- received from Designated Router, otherwise do nothing See
- RFC 2328 Section 13.5 */
- /* Whether LSA is more recent or not, and whether this is in
- response to the LSA being sent out recieving interface has been
- worked out previously */
- /* Deal with router as BDR */
- if (inbr->oi->state == ISM_Backup && ! NBR_IS_DR (inbr))
- return;
- /* Schedule a delayed LSA Ack to be sent */
- listnode_add (inbr->oi->ls_ack, ospf_lsa_lock (lsa));
- }
- /* Check LSA is related to external info. */
- struct external_info *
- ospf_external_info_check (struct ospf_lsa *lsa)
- {
- struct as_external_lsa *al;
- struct prefix_ipv4 p;
- struct route_node *rn;
- int type;
- al = (struct as_external_lsa *) lsa->data;
- p.family = AF_INET;
- p.prefix = lsa->data->id;
- p.prefixlen = ip_masklen (al->mask);
- for (type = 0; type <= ZEBRA_ROUTE_MAX; type++)
- {
- int redist_type = is_prefix_default (&p) ? DEFAULT_ROUTE : type;
- if (ospf_is_type_redistributed (redist_type))
- if (EXTERNAL_INFO (type))
- {
- rn = route_node_lookup (EXTERNAL_INFO (type),
- (struct prefix *) &p);
- if (rn)
- {
- route_unlock_node (rn);
- if (rn->info != NULL)
- return (struct external_info *) rn->info;
- }
- }
- }
- return NULL;
- }
- void
- ospf_process_self_originated_lsa (struct ospf *ospf,
- struct ospf_lsa *new, struct ospf_area *area)
- {
- struct ospf_interface *oi;
- struct external_info *ei;
- listnode node;
-
- if (IS_DEBUG_OSPF_EVENT)
- zlog_info ("LSA[Type%d:%s]: Process self-originated LSA",
- new->data->type, inet_ntoa (new->data->id));
- /* If we're here, we installed a self-originated LSA that we received
- from a neighbor, i.e. it's more recent. We must see whether we want
- to originate it.
- If yes, we should use this LSA's sequence number and reoriginate
- a new instance.
- if not --- we must flush this LSA from the domain. */
- switch (new->data->type)
- {
- case OSPF_ROUTER_LSA:
- /* Originate a new instance and schedule flooding */
- /* It shouldn't be necessary, but anyway */
- ospf_lsa_unlock (area->router_lsa_self);
- area->router_lsa_self = ospf_lsa_lock (new);
- ospf_router_lsa_timer_add (area);
- return;
- case OSPF_NETWORK_LSA:
- #ifdef HAVE_OPAQUE_LSA
- case OSPF_OPAQUE_LINK_LSA:
- #endif /* HAVE_OPAQUE_LSA */
- /* We must find the interface the LSA could belong to.
- If the interface is no more a broadcast type or we are no more
- the DR, we flush the LSA otherwise -- create the new instance and
- schedule flooding. */
- /* Look through all interfaces, not just area, since interface
- could be moved from one area to another. */
- for (node = listhead (ospf->oiflist); node; nextnode (node))
- /* These are sanity check. */
- if ((oi = getdata (node)) != NULL)
- if (IPV4_ADDR_SAME (&oi->address->u.prefix4, &new->data->id))
- {
- if (oi->area != area ||
- oi->type != OSPF_IFTYPE_BROADCAST ||
- !IPV4_ADDR_SAME (&oi->address->u.prefix4, &DR (oi)))
- {
- ospf_schedule_lsa_flush_area (area, new);
- return;
- }
-
- #ifdef HAVE_OPAQUE_LSA
- if (new->data->type == OSPF_OPAQUE_LINK_LSA)
- {
- ospf_opaque_lsa_refresh (new);
- return;
- }
- #endif /* HAVE_OPAQUE_LSA */
- ospf_lsa_unlock (oi->network_lsa_self);
- oi->network_lsa_self = ospf_lsa_lock (new);
-
- /* Schedule network-LSA origination. */
- ospf_network_lsa_timer_add (oi);
- return;
- }
- break;
- case OSPF_SUMMARY_LSA:
- case OSPF_ASBR_SUMMARY_LSA:
- ospf_schedule_abr_task (ospf);
- break;
- case OSPF_AS_EXTERNAL_LSA :
- #ifdef HAVE_NSSA
- case OSPF_AS_NSSA_LSA:
- #endif /* HAVE_NSSA */
- ei = ospf_external_info_check (new);
- if (ei)
- ospf_external_lsa_refresh (ospf, new, ei, LSA_REFRESH_FORCE);
- else
- ospf_lsa_flush_as (ospf, new);
- break;
- #ifdef HAVE_OPAQUE_LSA
- case OSPF_OPAQUE_AREA_LSA:
- ospf_opaque_lsa_refresh (new);
- break;
- case OSPF_OPAQUE_AS_LSA:
- ospf_opaque_lsa_refresh (new); /* Reconsideration may needed. *//* XXX */
- break;
- #endif /* HAVE_OPAQUE_LSA */
- default:
- break;
- }
- }
- /* OSPF LSA flooding -- RFC2328 Section 13.(5). */
- /* Now Updated for NSSA operation, as follows:
- Type-5's have no change. Blocked to STUB or NSSA.
- Type-7's can be received, and if a DR
- they will also flood the local NSSA Area as Type-7's
- If a Self-Originated LSA (now an ASBR),
- The LSDB will be updated as Type-5's, (for continual re-fresh)
- If an NSSA-IR it is installed/flooded as Type-7, P-bit on.
- if an NSSA-ABR it is installed/flooded as Type-7, P-bit off.
- Later, during the ABR TASK, if the ABR is the Elected NSSA
- translator, then All Type-7s (with P-bit ON) are Translated to
- Type-5's and flooded to all non-NSSA/STUB areas.
- During ASE Calculations,
- non-ABRs calculate external routes from Type-7's
- ABRs calculate external routes from Type-5's and non-self Type-7s
- */
- int
- ospf_flood (struct ospf *ospf, struct ospf_neighbor *nbr,
- struct ospf_lsa *current, struct ospf_lsa *new)
- {
- struct ospf_interface *oi;
- struct timeval now;
- int lsa_ack_flag;
- /* Type-7 LSA's will be flooded throughout their native NSSA area,
- but will also be flooded as Type-5's into ABR capable links. */
- if (IS_DEBUG_OSPF_EVENT)
- zlog_info ("LSA[Flooding]: start, NBR %s (%s), cur(%p), New-LSA[%s]",
- inet_ntoa (nbr->router_id),
- LOOKUP (ospf_nsm_state_msg, nbr->state),
- current,
- dump_lsa_key (new));
- lsa_ack_flag = 0;
- oi = nbr->oi;
- /* Get current time. */
- gettimeofday (&now, NULL);
- /* If there is already a database copy, and if the
- database copy was received via flooding and installed less
- than MinLSArrival seconds ago, discard the new LSA
- (without acknowledging it). */
- if (current != NULL) /* -- endo. */
- {
- if (IS_LSA_SELF (current)
- && (ntohs (current->data->ls_age) == 0
- && ntohl (current->data->ls_seqnum) == OSPF_INITIAL_SEQUENCE_NUMBER))
- {
- if (IS_DEBUG_OSPF_EVENT)
- zlog_info ("LSA[Flooding]: Got a self-originated LSA, "
- "while local one is initial instance.");
- ; /* Accept this LSA for quick LSDB resynchronization. */
- }
- else if (tv_cmp (tv_sub (now, current->tv_recv),
- int2tv (OSPF_MIN_LS_ARRIVAL)) < 0)
- {
- if (IS_DEBUG_OSPF_EVENT)
- zlog_info ("LSA[Flooding]: LSA is received recently.");
- return -1;
- }
- }
- /* Flood the new LSA out some subset of the router's interfaces.
- In some cases (e.g., the state of the receiving interface is
- DR and the LSA was received from a router other than the
- Backup DR) the LSA will be flooded back out the receiving
- interface. */
- lsa_ack_flag = ospf_flood_through (ospf, nbr, new);
- #ifdef HAVE_OPAQUE_LSA
- /* Remove the current database copy from all neighbors' Link state
- retransmission lists. AS_EXTERNAL and AS_EXTERNAL_OPAQUE does
- ^^^^^^^^^^^^^^^^^^^^^^^
- not have area ID.
- All other (even NSSA's) do have area ID. */
- #else /* HAVE_OPAQUE_LSA */
- /* Remove the current database copy from all neighbors' Link state
- retransmission lists. Only AS_EXTERNAL does not have area ID.
- All other (even NSSA's) do have area ID. */
- #endif /* HAVE_OPAQUE_LSA */
- if (current)
- {
- switch (current->data->type)
- {
- case OSPF_AS_EXTERNAL_LSA:
- #ifdef HAVE_OPAQUE_LSA
- case OSPF_OPAQUE_AS_LSA:
- #endif /* HAVE_OPAQUE_LSA */
- ospf_ls_retransmit_delete_nbr_as (ospf, current);
- break;
- default:
- ospf_ls_retransmit_delete_nbr_area (nbr->oi->area, current);
- break;
- }
- }
- /* Do some internal house keeping that is needed here */
- SET_FLAG (new->flags, OSPF_LSA_RECEIVED);
- ospf_lsa_is_self_originated (ospf, new); /* Let it set the flag */
- /* Install the new LSA in the link state database
- (replacing the current database copy). This may cause the
- routing table calculation to be scheduled. In addition,
- timestamp the new LSA with the current time. The flooding
- procedure cannot overwrite the newly installed LSA until
- MinLSArrival seconds have elapsed. */
- new = ospf_lsa_install (ospf, nbr->oi, new);
- /* Acknowledge the receipt of the LSA by sending a Link State
- Acknowledgment packet back out the receiving interface. */
- if (lsa_ack_flag)
- ospf_flood_delayed_lsa_ack (nbr, new);
- /* If this new LSA indicates that it was originated by the
- receiving router itself, the router must take special action,
- either updating the LSA or in some cases flushing it from
- the routing domain. */
- if (ospf_lsa_is_self_originated (ospf, new))
- ospf_process_self_originated_lsa (ospf, new, oi->area);
- else
- /* Update statistics value for OSPF-MIB. */
- ospf->rx_lsa_count++;
- return 0;
- }
- /* OSPF LSA flooding -- RFC2328 Section 13.3. */
- int
- ospf_flood_through_interface (struct ospf_interface *oi,
- struct ospf_neighbor *inbr,
- struct ospf_lsa *lsa)
- {
- struct ospf_neighbor *onbr;
- struct route_node *rn;
- int retx_flag;
- if (IS_DEBUG_OSPF_EVENT)
- zlog_info ("ospf_flood_through_interface(): "
- "considering int %s, INBR(%s), LSA[%s]",
- IF_NAME (oi), inbr ? inet_ntoa (inbr->router_id) : "NULL",
- dump_lsa_key (lsa));
- if (!ospf_if_is_enable (oi))
- return 0;
- /* Remember if new LSA is aded to a retransmit list. */
- retx_flag = 0;
- /* Each of the neighbors attached to this interface are examined,
- to determine whether they must receive the new LSA. The following
- steps are executed for each neighbor: */
- for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
- {
- struct ospf_lsa *ls_req;
-
- if (rn->info == NULL)
- continue;
- onbr = rn->info;
- if (IS_DEBUG_OSPF_EVENT)
- zlog_info ("ospf_flood_through_interface(): considering nbr %s (%s)",
- inet_ntoa (onbr->router_id),
- LOOKUP (ospf_nsm_state_msg, onbr->state));
- /* If the neighbor is in a lesser state than Exchange, it
- does not participate in flooding, and the next neighbor
- should be examined. */
- if (onbr->state < NSM_Exchange)
- continue;
- /* If the adjacency is not yet full (neighbor state is
- Exchange or Loading), examine the Link state request
- list associated with this adjacency. If there is an
- instance of the new LSA on the list, it indicates that
- the neighboring router has an instance of the LSA
- already. Compare the new LSA to the neighbor's copy: */
- if (onbr->state < NSM_Full)
- {
- if (IS_DEBUG_OSPF_EVENT)
- zlog_info ("ospf_flood_through_interface(): nbr adj is not Full");
- ls_req = ospf_ls_request_lookup (onbr, lsa);
- if (ls_req != NULL)
- {
- int ret;
- ret = ospf_lsa_more_recent (ls_req, lsa);
- /* The new LSA is less recent. */
- if (ret > 0)
- continue;
- /* The two copies are the same instance, then delete
- the LSA from the Link state request list. */
- else if (ret == 0)
- {
- ospf_ls_request_delete (onbr, ls_req);
- ospf_check_nbr_loading (onbr);
- continue;
- }
- /* The new LSA is more recent. Delete the LSA
- from the Link state request list. */
- else
- {
- ospf_ls_request_delete (onbr, ls_req);
- ospf_check_nbr_loading (onbr);
- }
- }
- }
- #ifdef HAVE_OPAQUE_LSA
- if (IS_OPAQUE_LSA (lsa->data->type))
- {
- if (! CHECK_FLAG (onbr->options, OSPF_OPTION_O))
- {
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
- zlog_info ("Skip this neighbor: Not Opaque-capable.");
- continue;
- }
- if (IS_OPAQUE_LSA_ORIGINATION_BLOCKED (oi->ospf->opaque)
- && IS_LSA_SELF (lsa)
- && onbr->state == NSM_Full)
- {
- /* Small attempt to reduce unnecessary retransmission. */
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
- zlog_info ("Skip this neighbor: Initial flushing done.");
- continue;
- }
- }
- #endif /* HAVE_OPAQUE_LSA */
- /* If the new LSA was received from this neighbor,
- examine the next neighbor. */
- if (inbr)
- {
- /*
- * Triggered by LSUpd message parser "ospf_ls_upd ()".
- * E.g., all LSAs handling here is received via network.
- */
- if (IPV4_ADDR_SAME (&inbr->router_id, &onbr->router_id))
- {
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
- zlog_info ("Skip this neighbor: inbr == onbr");
- continue;
- }
- }
- else
- {
- /*
- * Triggered by MaxAge remover, so far.
- * NULL "inbr" means flooding starts from this node.
- */
- if (IPV4_ADDR_SAME (&lsa->data->adv_router, &onbr->router_id))
- {
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
- zlog_info ("Skip this neighbor: lsah->adv_router == onbr");
- continue;
- }
- }
- /* Add the new LSA to the Link state retransmission list
- for the adjacency. The LSA will be retransmitted
- at intervals until an acknowledgment is seen from
- the neighbor. */
- ospf_ls_retransmit_add (onbr, lsa);
- retx_flag = 1;
- }
- /* If in the previous step, the LSA was NOT added to any of
- the Link state retransmission lists, there is no need to
- flood the LSA out the interface. */
- if (retx_flag == 0)
- {
- return (inbr && inbr->oi == oi);
- }
- /* if we've received the lsa on this interface we need to perform
- additional checking */
- if (inbr && (inbr->oi == oi))
- {
- /* If the new LSA was received on this interface, and it was
- received from either the Designated Router or the Backup
- Designated Router, chances are that all the neighbors have
- received the LSA already. */
- if (NBR_IS_DR (inbr) || NBR_IS_BDR (inbr))
- {
- #ifdef HAVE_NSSA
- if (IS_DEBUG_OSPF_NSSA)
- zlog_info ("ospf_flood_through_interface(): "
- "DR/BDR NOT SEND to int %s", IF_NAME (oi));
- #endif /* HAVE_NSSA */
- return 1;
- }
-
- /* If the new LSA was received on this interface, and the
- interface state is Backup, examine the next interface. The
- Designated Router will do the flooding on this interface.
- However, if the Designated Router fails the router will
- end up retransmitting the updates. */
- if (oi->state == ISM_Backup)
- {
- #ifdef HAVE_NSSA
- if (IS_DEBUG_OSPF_NSSA)
- zlog_info ("ospf_flood_through_interface(): "
- "ISM_Backup NOT SEND to int %s", IF_NAME (oi));
- #endif /* HAVE_NSSA */
- return 1;
- }
- }
- /* The LSA must be flooded out the interface. Send a Link State
- Update packet (including the new LSA as contents) out the
- interface. The LSA's LS age must be incremented by InfTransDelay
- (which must be > 0) when it is copied into the outgoing Link
- State Update packet (until the LS age field reaches the maximum
- value of MaxAge). */
- #ifdef HAVE_NSSA
- if (IS_DEBUG_OSPF_NSSA)
- zlog_info ("ospf_flood_through_interface(): "
- "DR/BDR sending upd to int %s", IF_NAME (oi));
- #else /* ! HAVE_NSSA */
- if (IS_DEBUG_OSPF_EVENT)
- zlog_info ("ospf_flood_through_interface(): "
- "sending upd to int %s", IF_NAME (oi));
- #endif /* HAVE_NSSA */
- /* RFC2328 Section 13.3
- On non-broadcast networks, separate Link State Update
- packets must be sent, as unicasts, to each adjacent neighbor
- (i.e., those in state Exchange or greater). The destination
- IP addresses for these packets are the neighbors' IP
- addresses. */
- if (oi->type == OSPF_IFTYPE_NBMA)
- {
- struct route_node *rn;
- struct ospf_neighbor *nbr;
- for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
- if ((nbr = rn->info) != NULL)
- if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange)
- ospf_ls_upd_send_lsa (nbr, lsa, OSPF_SEND_PACKET_DIRECT);
- }
- else
- ospf_ls_upd_send_lsa (oi->nbr_self, lsa, OSPF_SEND_PACKET_INDIRECT);
- return 0;
- }
- int
- ospf_flood_through_area (struct ospf_area *area,
- struct ospf_neighbor *inbr, struct ospf_lsa *lsa)
- {
- listnode node;
- int lsa_ack_flag = 0;
- /* All other types are specific to a single area (Area A). The
- eligible interfaces are all those interfaces attaching to the
- Area A. If Area A is the backbone, this includes all the virtual
- links. */
- for (node = listhead (area->oiflist); node; nextnode (node))
- {
- struct ospf_interface *oi = getdata (node);
- if (area->area_id.s_addr != OSPF_AREA_BACKBONE &&
- oi->type == OSPF_IFTYPE_VIRTUALLINK)
- continue;
- #ifdef HAVE_OPAQUE_LSA
- if ((lsa->data->type == OSPF_OPAQUE_LINK_LSA) && (lsa->oi != oi))
- {
- /*
- * Link local scoped Opaque-LSA should only be flooded
- * for the link on which the LSA has received.
- */
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
- zlog_info ("Type-9 Opaque-LSA: lsa->oi(%p) != oi(%p)", lsa->oi, oi);
- continue;
- }
- #endif /* HAVE_OPAQUE_LSA */
- if (ospf_flood_through_interface (oi, inbr, lsa))
- lsa_ack_flag = 1;
- }
- return (lsa_ack_flag);
- }
- int
- ospf_flood_through_as (struct ospf *ospf, struct ospf_neighbor *inbr,
- struct ospf_lsa *lsa)
- {
- listnode node;
- int lsa_ack_flag;
- lsa_ack_flag = 0;
- /* The incoming LSA is type 5 or type 7 (AS-EXTERNAL or AS-NSSA )
- Divert the Type-5 LSA's to all non-NSSA/STUB areas
- Divert the Type-7 LSA's to all NSSA areas
- AS-external-LSAs are flooded throughout the entire AS, with the
- exception of stub areas (see Section 3.6). The eligible
- interfaces are all the router's interfaces, excluding virtual
- links and those interfaces attaching to stub areas. */
- #ifdef HAVE_NSSA
- if (CHECK_FLAG (lsa->flags, OSPF_LSA_LOCAL_XLT)) /* Translated from 7 */
- if (IS_DEBUG_OSPF_NSSA)
- zlog_info ("Flood/AS: NSSA TRANSLATED LSA");
- #endif /* HAVE_NSSA */
- for (node = listhead (ospf->areas); node; nextnode (node))
- {
- int continue_flag = 0;
- struct ospf_area *area = getdata (node);
- listnode if_node;
- switch (area->external_routing)
- {
- /* Don't send AS externals into stub areas. Various types
- of support for partial stub areas can be implemented
- here. NSSA's will receive Type-7's that have areas
- matching the originl LSA. */
- case OSPF_AREA_NSSA: /* Sending Type 5 or 7 into NSSA area */
- #ifdef HAVE_NSSA
- /* Type-7, flood NSSA area */
- if (lsa->data->type == OSPF_AS_NSSA_LSA
- && area == lsa->area)
- continue_flag = 0;
- else
- continue_flag = 1; /* Skip this NSSA area for Type-5's et al */
- break;
- #endif /* HAVE_NSSA */
- case OSPF_AREA_TYPE_MAX:
- case OSPF_AREA_STUB:
- continue_flag = 1; /* Skip this area. */
- break;
- case OSPF_AREA_DEFAULT:
- default:
- #ifdef HAVE_NSSA
- /* No Type-7 into normal area */
- if (lsa->data->type == OSPF_AS_NSSA_LSA)
- continue_flag = 1; /* skip Type-7 */
- else
- #endif /* HAVE_NSSA */
- continue_flag = 0; /* Do this area. */
- break;
- }
-
- /* Do continue for above switch. Saves a big if then mess */
- if (continue_flag)
- continue; /* main for-loop */
-
- /* send to every interface in this area */
- for (if_node = listhead (area->oiflist); if_node; nextnode (if_node))
- {
- struct ospf_interface *oi = getdata (if_node);
- /* Skip virtual links */
- if (oi->type != OSPF_IFTYPE_VIRTUALLINK)
- if (ospf_flood_through_interface (oi, inbr, lsa)) /* lsa */
- lsa_ack_flag = 1;
- }
- } /* main area for-loop */
-
- return (lsa_ack_flag);
- }
- int
- ospf_flood_through (struct ospf *ospf,
- struct ospf_neighbor *inbr, struct ospf_lsa *lsa)
- {
- int lsa_ack_flag = 0;
-
- /* Type-7 LSA's for NSSA are flooded throughout the AS here, and
- upon return are updated in the LSDB for Type-7's. Later,
- re-fresh will re-send them (and also, if ABR, packet code will
- translate to Type-5's)
-
- As usual, Type-5 LSA's (if not DISCARDED because we are STUB or
- NSSA) are flooded throughout the AS, and are updated in the
- global table. */
- /*
- * At the common sub-sub-function "ospf_flood_through_interface()",
- * a parameter "inbr" will be used to distinguish the called context
- * whether the given LSA was received from the neighbor, or the
- * flooding for the LSA starts from this node (e.g. the LSA was self-
- * originated, or the LSA is going to be flushed from routing domain).
- *
- * So, for consistency reasons, this function "ospf_flood_through()"
- * should also allow the usage that the given "inbr" parameter to be
- * NULL. If we do so, corresponding AREA parameter should be referred
- * by "lsa->area", instead of "inbr->oi->area".
- */
- switch (lsa->data->type)
- {
- case OSPF_AS_EXTERNAL_LSA: /* Type-5 */
- #ifdef HAVE_OPAQUE_LSA
- case OSPF_OPAQUE_AS_LSA:
- #endif /* HAVE_OPAQUE_LSA */
- lsa_ack_flag = ospf_flood_through_as (ospf, inbr, lsa);
- break;
- #ifdef HAVE_NSSA
- /* Type-7 Only received within NSSA, then flooded */
- case OSPF_AS_NSSA_LSA:
- /* Any P-bit was installed with the Type-7. */
- if (IS_DEBUG_OSPF_NSSA)
- zlog_info ("ospf_flood_through: LOCAL NSSA FLOOD of Type-7.");
- /* Fallthrough */
- #endif /* HAVE_NSSA */
- default:
- lsa_ack_flag = ospf_flood_through_area (lsa->area, inbr, lsa);
- break;
- }
-
- return (lsa_ack_flag);
- }
- /* Management functions for neighbor's Link State Request list. */
- void
- ospf_ls_request_add (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
- {
- /*
- * We cannot make use of the newly introduced callback function
- * "lsdb->new_lsa_hook" to replace debug output below, just because
- * it seems no simple and smart way to pass neighbor information to
- * the common function "ospf_lsdb_add()" -- endo.
- */
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
- zlog_info ("RqstL(%lu)++, NBR(%s), LSA[%s]",
- ospf_ls_request_count (nbr),
- inet_ntoa (nbr->router_id), dump_lsa_key (lsa));
- ospf_lsdb_add (&nbr->ls_req, lsa);
- }
- unsigned long
- ospf_ls_request_count (struct ospf_neighbor *nbr)
- {
- return ospf_lsdb_count_all (&nbr->ls_req);
- }
- int
- ospf_ls_request_isempty (struct ospf_neighbor *nbr)
- {
- return ospf_lsdb_isempty (&nbr->ls_req);
- }
- /* Remove LSA from neighbor's ls-request list. */
- void
- ospf_ls_request_delete (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
- {
- if (nbr->ls_req_last == lsa)
- {
- ospf_lsa_unlock (nbr->ls_req_last);
- nbr->ls_req_last = NULL;
- }
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING)) /* -- endo. */
- zlog_info ("RqstL(%lu)--, NBR(%s), LSA[%s]",
- ospf_ls_request_count (nbr),
- inet_ntoa (nbr->router_id), dump_lsa_key (lsa));
- ospf_lsdb_delete (&nbr->ls_req, lsa);
- }
- /* Remove all LSA from neighbor's ls-requenst list. */
- void
- ospf_ls_request_delete_all (struct ospf_neighbor *nbr)
- {
- ospf_lsa_unlock (nbr->ls_req_last);
- nbr->ls_req_last = NULL;
- ospf_lsdb_delete_all (&nbr->ls_req);
- }
- /* Lookup LSA from neighbor's ls-request list. */
- struct ospf_lsa *
- ospf_ls_request_lookup (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
- {
- return ospf_lsdb_lookup (&nbr->ls_req, lsa);
- }
- struct ospf_lsa *
- ospf_ls_request_new (struct lsa_header *lsah)
- {
- struct ospf_lsa *new;
- new = ospf_lsa_new ();
- new->data = ospf_lsa_data_new (OSPF_LSA_HEADER_SIZE);
- memcpy (new->data, lsah, OSPF_LSA_HEADER_SIZE);
- return new;
- }
- /* Management functions for neighbor's ls-retransmit list. */
- unsigned long
- ospf_ls_retransmit_count (struct ospf_neighbor *nbr)
- {
- return ospf_lsdb_count_all (&nbr->ls_rxmt);
- }
- unsigned long
- ospf_ls_retransmit_count_self (struct ospf_neighbor *nbr, int lsa_type)
- {
- return ospf_lsdb_count_self (&nbr->ls_rxmt, lsa_type);
- }
- int
- ospf_ls_retransmit_isempty (struct ospf_neighbor *nbr)
- {
- return ospf_lsdb_isempty (&nbr->ls_rxmt);
- }
- /* Add LSA to be retransmitted to neighbor's ls-retransmit list. */
- void
- ospf_ls_retransmit_add (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
- {
- struct ospf_lsa *old;
- old = ospf_ls_retransmit_lookup (nbr, lsa);
- if (ospf_lsa_more_recent (old, lsa) < 0)
- {
- if (old)
- {
- old->retransmit_counter--;
- ospf_lsdb_delete (&nbr->ls_rxmt, old);
- }
- lsa->retransmit_counter++;
- /*
- * We cannot make use of the newly introduced callback function
- * "lsdb->new_lsa_hook" to replace debug output below, just because
- * it seems no simple and smart way to pass neighbor information to
- * the common function "ospf_lsdb_add()" -- endo.
- */
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING))
- zlog_info ("RXmtL(%lu)++, NBR(%s), LSA[%s]",
- ospf_ls_retransmit_count (nbr),
- inet_ntoa (nbr->router_id), dump_lsa_key (lsa));
- ospf_lsdb_add (&nbr->ls_rxmt, lsa);
- }
- }
- /* Remove LSA from neibghbor's ls-retransmit list. */
- void
- ospf_ls_retransmit_delete (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
- {
- if (ospf_ls_retransmit_lookup (nbr, lsa))
- {
- lsa->retransmit_counter--;
- if (IS_DEBUG_OSPF (lsa, LSA_FLOODING)) /* -- endo. */
- zlog_info ("RXmtL(%lu)--, NBR(%s), LSA[%s]",
- ospf_ls_retransmit_count (nbr),
- inet_ntoa (nbr->router_id), dump_lsa_key (lsa));
- ospf_lsdb_delete (&nbr->ls_rxmt, lsa);
- }
- }
- /* Clear neighbor's ls-retransmit list. */
- void
- ospf_ls_retransmit_clear (struct ospf_neighbor *nbr)
- {
- struct ospf_lsdb *lsdb;
- int i;
- lsdb = &nbr->ls_rxmt;
- for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++)
- {
- struct route_table *table = lsdb->type[i].db;
- struct route_node *rn;
- struct ospf_lsa *lsa;
- for (rn = route_top (table); rn; rn = route_next (rn))
- if ((lsa = rn->info) != NULL)
- ospf_ls_retransmit_delete (nbr, lsa);
- }
- ospf_lsa_unlock (nbr->ls_req_last);
- nbr->ls_req_last = NULL;
- }
- /* Lookup LSA from neighbor's ls-retransmit list. */
- struct ospf_lsa *
- ospf_ls_retransmit_lookup (struct ospf_neighbor *nbr, struct ospf_lsa *lsa)
- {
- return ospf_lsdb_lookup (&nbr->ls_rxmt, lsa);
- }
- void
- ospf_ls_retransmit_delete_nbr_if (struct ospf_interface *oi,
- struct ospf_lsa *lsa)
- {
- struct route_node *rn;
- struct ospf_neighbor *nbr;
- struct ospf_lsa *lsr;
- if (ospf_if_is_enable (oi))
- for (rn = route_top (oi->nbrs); rn; rn = route_next (rn))
- /* If LSA find in LS-retransmit list, then remove it. */
- if ((nbr = rn->info) != NULL)
- {
- lsr = ospf_ls_retransmit_lookup (nbr, lsa);
-
- /* If LSA find in ls-retransmit list, remove it. */
- if (lsr != NULL && lsr->data->ls_seqnum == lsa->data->ls_seqnum)
- ospf_ls_retransmit_delete (nbr, lsr);
- }
- }
- void
- ospf_ls_retransmit_delete_nbr_area (struct ospf_area *area,
- struct ospf_lsa *lsa)
- {
- listnode node;
- for (node = listhead (area->oiflist); node; nextnode (node))
- ospf_ls_retransmit_delete_nbr_if (getdata (node), lsa);
- }
- void
- ospf_ls_retransmit_delete_nbr_as (struct ospf *ospf, struct ospf_lsa *lsa)
- {
- listnode node;
- for (node = listhead (ospf->oiflist); node; nextnode (node))
- ospf_ls_retransmit_delete_nbr_if (getdata (node), lsa);
- }
- /* Sets ls_age to MaxAge and floods throu the area.
- When we implement ASE routing, there will be anothe function
- flushing an LSA from the whole domain. */
- void
- ospf_lsa_flush_area (struct ospf_lsa *lsa, struct ospf_area *area)
- {
- lsa->data->ls_age = htons (OSPF_LSA_MAXAGE);
- ospf_flood_through_area (area, NULL, lsa);
- ospf_lsa_maxage (area->ospf, lsa);
- }
- void
- ospf_lsa_flush_as (struct ospf *ospf, struct ospf_lsa *lsa)
- {
- lsa->data->ls_age = htons (OSPF_LSA_MAXAGE);
- ospf_flood_through_as (ospf, NULL, lsa);
- ospf_lsa_maxage (ospf, lsa);
- }