Merge pull request #2028 from qlyoung/cleanup-static-route-consistent-ordering

[mirror_frr.git] / ospf6d / ospf6_top.c

/*
 * Copyright (C) 2003 Yasuhiro Ohara
 *
 * 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 "log.h"
#include "memory.h"
#include "vty.h"
#include "linklist.h"
#include "prefix.h"
#include "table.h"
#include "thread.h"
#include "command.h"
#include "defaults.h"

#include "ospf6_proto.h"
#include "ospf6_message.h"
#include "ospf6_lsa.h"
#include "ospf6_lsdb.h"
#include "ospf6_route.h"
#include "ospf6_zebra.h"

#include "ospf6_top.h"
#include "ospf6_area.h"
#include "ospf6_interface.h"
#include "ospf6_neighbor.h"

#include "ospf6_flood.h"
#include "ospf6_asbr.h"
#include "ospf6_abr.h"
#include "ospf6_intra.h"
#include "ospf6_spf.h"
#include "ospf6d.h"

DEFINE_QOBJ_TYPE(ospf6)

/* global ospf6d variable */
struct ospf6 *ospf6;
static struct ospf6_master ospf6_master;
struct ospf6_master *om6;

static void ospf6_disable(struct ospf6 *o);

static void ospf6_top_lsdb_hook_add(struct ospf6_lsa *lsa)
{
        switch (ntohs(lsa->header->type)) {
        case OSPF6_LSTYPE_AS_EXTERNAL:
                ospf6_asbr_lsa_add(lsa);
                break;

        default:
                break;
        }
}

static void ospf6_top_lsdb_hook_remove(struct ospf6_lsa *lsa)
{
        switch (ntohs(lsa->header->type)) {
        case OSPF6_LSTYPE_AS_EXTERNAL:
                ospf6_asbr_lsa_remove(lsa, NULL);
                break;

        default:
                break;
        }
}

static void ospf6_top_route_hook_add(struct ospf6_route *route)
{
        ospf6_abr_originate_summary(route);
        ospf6_zebra_route_update_add(route);
}

static void ospf6_top_route_hook_remove(struct ospf6_route *route)
{
        route->flag |= OSPF6_ROUTE_REMOVE;
        ospf6_abr_originate_summary(route);
        ospf6_zebra_route_update_remove(route);
}

static void ospf6_top_brouter_hook_add(struct ospf6_route *route)
{
        if (IS_OSPF6_DEBUG_EXAMIN(AS_EXTERNAL)) {
                uint32_t brouter_id;
                char brouter_name[16];

                brouter_id = ADV_ROUTER_IN_PREFIX(&route->prefix);
                inet_ntop(AF_INET, &brouter_id, brouter_name,
                          sizeof(brouter_name));
                zlog_debug("%s: brouter %s add with adv router %x nh count %u",
                           __PRETTY_FUNCTION__, brouter_name,
                           route->path.origin.adv_router,
                           listcount(route->nh_list));
        }
        ospf6_abr_examin_brouter(ADV_ROUTER_IN_PREFIX(&route->prefix));
        ospf6_asbr_lsentry_add(route);
        ospf6_abr_originate_summary(route);
}

static void ospf6_top_brouter_hook_remove(struct ospf6_route *route)
{
        if (IS_OSPF6_DEBUG_EXAMIN(AS_EXTERNAL)) {
                uint32_t brouter_id;
                char brouter_name[16];

                brouter_id = ADV_ROUTER_IN_PREFIX(&route->prefix);
                inet_ntop(AF_INET, &brouter_id, brouter_name,
                          sizeof(brouter_name));
                zlog_debug("%s: brouter %s del with nh count %u",
                           __PRETTY_FUNCTION__, brouter_name,
                           listcount(route->nh_list));
        }
        route->flag |= OSPF6_ROUTE_REMOVE;
        ospf6_abr_examin_brouter(ADV_ROUTER_IN_PREFIX(&route->prefix));
        ospf6_asbr_lsentry_remove(route);
        ospf6_abr_originate_summary(route);
}

static struct ospf6 *ospf6_create(void)
{
        struct ospf6 *o;

        o = XCALLOC(MTYPE_OSPF6_TOP, sizeof(struct ospf6));

        /* initialize */
        monotime(&o->starttime);
        o->area_list = list_new();
        o->area_list->cmp = ospf6_area_cmp;
        o->lsdb = ospf6_lsdb_create(o);
        o->lsdb_self = ospf6_lsdb_create(o);
        o->lsdb->hook_add = ospf6_top_lsdb_hook_add;
        o->lsdb->hook_remove = ospf6_top_lsdb_hook_remove;

        o->spf_delay = OSPF_SPF_DELAY_DEFAULT;
        o->spf_holdtime = OSPF_SPF_HOLDTIME_DEFAULT;
        o->spf_max_holdtime = OSPF_SPF_MAX_HOLDTIME_DEFAULT;
        o->spf_hold_multiplier = 1;

        /* LSA timers value init */
        o->lsa_minarrival = OSPF_MIN_LS_ARRIVAL;

        o->route_table = OSPF6_ROUTE_TABLE_CREATE(GLOBAL, ROUTES);
        o->route_table->scope = o;
        o->route_table->hook_add = ospf6_top_route_hook_add;
        o->route_table->hook_remove = ospf6_top_route_hook_remove;

        o->brouter_table = OSPF6_ROUTE_TABLE_CREATE(GLOBAL, BORDER_ROUTERS);
        o->brouter_table->scope = o;
        o->brouter_table->hook_add = ospf6_top_brouter_hook_add;
        o->brouter_table->hook_remove = ospf6_top_brouter_hook_remove;

        o->external_table = OSPF6_ROUTE_TABLE_CREATE(GLOBAL, EXTERNAL_ROUTES);
        o->external_table->scope = o;

        o->external_id_table = route_table_init();

        o->ref_bandwidth = OSPF6_REFERENCE_BANDWIDTH;

        o->distance_table = route_table_init();

/* Enable "log-adjacency-changes" */
#if DFLT_OSPF6_LOG_ADJACENCY_CHANGES
        SET_FLAG(o->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
#endif

        QOBJ_REG(o, ospf6);

        return o;
}

void ospf6_delete(struct ospf6 *o)
{
        struct listnode *node, *nnode;
        struct ospf6_area *oa;

        QOBJ_UNREG(o);

        ospf6_flush_self_originated_lsas_now();
        ospf6_disable(ospf6);

        for (ALL_LIST_ELEMENTS(o->area_list, node, nnode, oa))
                ospf6_area_delete(oa);


        list_delete_and_null(&o->area_list);

        ospf6_lsdb_delete(o->lsdb);
        ospf6_lsdb_delete(o->lsdb_self);

        ospf6_route_table_delete(o->route_table);
        ospf6_route_table_delete(o->brouter_table);

        ospf6_route_table_delete(o->external_table);
        route_table_finish(o->external_id_table);

        ospf6_distance_reset(o);
        route_table_finish(o->distance_table);

        XFREE(MTYPE_OSPF6_TOP, o);
}

static void ospf6_disable(struct ospf6 *o)
{
        struct listnode *node, *nnode;
        struct ospf6_area *oa;

        if (!CHECK_FLAG(o->flag, OSPF6_DISABLED)) {
                SET_FLAG(o->flag, OSPF6_DISABLED);

                for (ALL_LIST_ELEMENTS(o->area_list, node, nnode, oa))
                        ospf6_area_disable(oa);

                /* XXX: This also changes persistent settings */
                ospf6_asbr_redistribute_reset();

                ospf6_lsdb_remove_all(o->lsdb);
                ospf6_route_remove_all(o->route_table);
                ospf6_route_remove_all(o->brouter_table);

                THREAD_OFF(o->maxage_remover);
                THREAD_OFF(o->t_spf_calc);
                THREAD_OFF(o->t_ase_calc);
                THREAD_OFF(o->t_distribute_update);
        }
}

void ospf6_master_init(void)
{
        memset(&ospf6_master, 0, sizeof(struct ospf6_master));

        om6 = &ospf6_master;
}

static int ospf6_maxage_remover(struct thread *thread)
{
        struct ospf6 *o = (struct ospf6 *)THREAD_ARG(thread);
        struct ospf6_area *oa;
        struct ospf6_interface *oi;
        struct ospf6_neighbor *on;
        struct listnode *i, *j, *k;
        int reschedule = 0;

        o->maxage_remover = (struct thread *)NULL;

        for (ALL_LIST_ELEMENTS_RO(o->area_list, i, oa)) {
                for (ALL_LIST_ELEMENTS_RO(oa->if_list, j, oi)) {
                        for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, k, on)) {
                                if (on->state != OSPF6_NEIGHBOR_EXCHANGE
                                    && on->state != OSPF6_NEIGHBOR_LOADING)
                                        continue;

                                ospf6_maxage_remove(o);
                                return 0;
                        }
                }
        }

        for (ALL_LIST_ELEMENTS_RO(o->area_list, i, oa)) {
                for (ALL_LIST_ELEMENTS_RO(oa->if_list, j, oi)) {
                        if (ospf6_lsdb_maxage_remover(oi->lsdb)) {
                                reschedule = 1;
                        }
                }

                if (ospf6_lsdb_maxage_remover(oa->lsdb)) {
                        reschedule = 1;
                }
        }

        if (ospf6_lsdb_maxage_remover(o->lsdb)) {
                reschedule = 1;
        }

        if (reschedule) {
                ospf6_maxage_remove(o);
        }

        return 0;
}

void ospf6_maxage_remove(struct ospf6 *o)
{
        if (o)
                thread_add_timer(master, ospf6_maxage_remover, o,
                                 OSPF_LSA_MAXAGE_REMOVE_DELAY_DEFAULT,
                                 &o->maxage_remover);
}

void ospf6_router_id_update(void)
{
        if (!ospf6)
                return;

        if (ospf6->router_id_static != 0)
                ospf6->router_id = ospf6->router_id_static;
        else
                ospf6->router_id = om6->zebra_router_id;
}

/* start ospf6 */
DEFUN_NOSH (router_ospf6,
       router_ospf6_cmd,
       "router ospf6",
       ROUTER_STR
       OSPF6_STR)
{
        if (ospf6 == NULL) {
                ospf6 = ospf6_create();
                if (ospf6->router_id == 0)
                        ospf6_router_id_update();
        }
        /* set current ospf point. */
        VTY_PUSH_CONTEXT(OSPF6_NODE, ospf6);

        return CMD_SUCCESS;
}

/* stop ospf6 */
DEFUN (no_router_ospf6,
       no_router_ospf6_cmd,
       "no router ospf6",
       NO_STR
       ROUTER_STR
       OSPF6_STR)
{
        if (ospf6 == NULL)
                vty_out(vty, "OSPFv3 is not configured\n");
        else {
                ospf6_delete(ospf6);
                ospf6 = NULL;
        }

        /* return to config node . */
        VTY_PUSH_CONTEXT_NULL(CONFIG_NODE);

        return CMD_SUCCESS;
}

/* change Router_ID commands. */
DEFUN(ospf6_router_id,
      ospf6_router_id_cmd,
      "ospf6 router-id A.B.C.D",
      OSPF6_STR
      "Configure OSPF6 Router-ID\n"
      V4NOTATION_STR)
{
        VTY_DECLVAR_CONTEXT(ospf6, o);
        int idx = 0;
        int ret;
        const char *router_id_str;
        uint32_t router_id;
        struct ospf6_area *oa;
        struct listnode *node;

        argv_find(argv, argc, "A.B.C.D", &idx);
        router_id_str = argv[idx]->arg;

        ret = inet_pton(AF_INET, router_id_str, &router_id);
        if (ret == 0) {
                vty_out(vty, "malformed OSPF Router-ID: %s\n", router_id_str);
                return CMD_SUCCESS;
        }

        o->router_id_static = router_id;

        for (ALL_LIST_ELEMENTS_RO(o->area_list, node, oa)) {
                if (oa->full_nbrs) {
                        vty_out(vty,
                                "For this router-id change to take effect,"
                                " save config and restart ospf6d\n");
                        return CMD_SUCCESS;
                }
        }

        o->router_id = router_id;

        return CMD_SUCCESS;
}

DEFUN(no_ospf6_router_id,
      no_ospf6_router_id_cmd,
      "no ospf6 router-id [A.B.C.D]",
      NO_STR OSPF6_STR
      "Configure OSPF6 Router-ID\n"
      V4NOTATION_STR)
{
        VTY_DECLVAR_CONTEXT(ospf6, o);
        struct ospf6_area *oa;
        struct listnode *node;

        o->router_id_static = 0;

        for (ALL_LIST_ELEMENTS_RO(o->area_list, node, oa)) {
                if (oa->full_nbrs) {
                        vty_out(vty,
                                "For this router-id change to take effect,"
                                " save config and restart ospf6d\n");
                        return CMD_SUCCESS;
                }
        }
        o->router_id = 0;
        if (o->router_id_zebra.s_addr)
                o->router_id = (uint32_t)o->router_id_zebra.s_addr;

        return CMD_SUCCESS;
}

#if defined(VERSION_TYPE_DEV) && CONFDATE > 20180828
CPP_NOTICE("ospf6: `router-id A.B.C.D` deprecated 2017/08/28")
#endif
ALIAS_HIDDEN(ospf6_router_id, ospf6_router_id_hdn_cmd, "router-id A.B.C.D",
             "Configure OSPF6 Router-ID\n" V4NOTATION_STR)

#if defined(VERSION_TYPE_DEV) && CONFDATE > 20180828
CPP_NOTICE("ospf6: `no router-id A.B.C.D` deprecated 2017/08/28")
#endif
ALIAS_HIDDEN(no_ospf6_router_id, no_ospf6_router_id_hdn_cmd,
             "no router-id [A.B.C.D]",
             NO_STR "Configure OSPF6 Router-ID\n" V4NOTATION_STR)

DEFUN (ospf6_log_adjacency_changes,
       ospf6_log_adjacency_changes_cmd,
       "log-adjacency-changes",
       "Log changes in adjacency state\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, ospf6);

        SET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
        UNSET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL);
        return CMD_SUCCESS;
}

DEFUN (ospf6_log_adjacency_changes_detail,
       ospf6_log_adjacency_changes_detail_cmd,
       "log-adjacency-changes detail",
       "Log changes in adjacency state\n"
       "Log all state changes\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, ospf6);

        SET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
        SET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL);
        return CMD_SUCCESS;
}

DEFUN (no_ospf6_log_adjacency_changes,
       no_ospf6_log_adjacency_changes_cmd,
       "no log-adjacency-changes",
       NO_STR
       "Log changes in adjacency state\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, ospf6);

        UNSET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL);
        UNSET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
        return CMD_SUCCESS;
}

DEFUN (no_ospf6_log_adjacency_changes_detail,
       no_ospf6_log_adjacency_changes_detail_cmd,
       "no log-adjacency-changes detail",
       NO_STR
       "Log changes in adjacency state\n"
       "Log all state changes\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, ospf6);

        UNSET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL);
        return CMD_SUCCESS;
}

DEFUN (ospf6_timers_lsa,
       ospf6_timers_lsa_cmd,
       "timers lsa min-arrival (0-600000)",
       "Adjust routing timers\n"
       "OSPF6 LSA timers\n"
       "Minimum delay in receiving new version of a LSA\n"
       "Delay in milliseconds\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, ospf);
        int idx_number = 3;
        unsigned int minarrival;

        minarrival = strtoul(argv[idx_number]->arg, NULL, 10);
        ospf->lsa_minarrival = minarrival;

        return CMD_SUCCESS;
}

DEFUN (no_ospf6_timers_lsa,
       no_ospf6_timers_lsa_cmd,
       "no timers lsa min-arrival [(0-600000)]",
       NO_STR
       "Adjust routing timers\n"
       "OSPF6 LSA timers\n"
       "Minimum delay in receiving new version of a LSA\n"
       "Delay in milliseconds\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, ospf);
        int idx_number = 4;
        unsigned int minarrival;

        if (argc == 5) {
                minarrival = strtoul(argv[idx_number]->arg, NULL, 10);

                if (ospf->lsa_minarrival != minarrival
                    || minarrival == OSPF_MIN_LS_ARRIVAL)
                        return CMD_SUCCESS;
        }

        ospf->lsa_minarrival = OSPF_MIN_LS_ARRIVAL;

        return CMD_SUCCESS;
}


DEFUN (ospf6_distance,
       ospf6_distance_cmd,
       "distance (1-255)",
       "Administrative distance\n"
       "OSPF6 Administrative distance\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, o);

        o->distance_all = atoi(argv[1]->arg);

        return CMD_SUCCESS;
}

DEFUN (no_ospf6_distance,
       no_ospf6_distance_cmd,
       "no distance (1-255)",
       NO_STR
       "Administrative distance\n"
       "OSPF6 Administrative distance\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, o);

        o->distance_all = 0;

        return CMD_SUCCESS;
}

DEFUN (ospf6_distance_ospf6,
       ospf6_distance_ospf6_cmd,
       "distance ospf6 {intra-area (1-255)|inter-area (1-255)|external (1-255)}",
       "Administrative distance\n"
       "OSPF6 administrative distance\n"
       "Intra-area routes\n"
       "Distance for intra-area routes\n"
       "Inter-area routes\n"
       "Distance for inter-area routes\n"
       "External routes\n"
       "Distance for external routes\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, o);
        int idx = 0;

        o->distance_intra = 0;
        o->distance_inter = 0;
        o->distance_external = 0;

        if (argv_find(argv, argc, "intra-area", &idx))
                o->distance_intra = atoi(argv[idx + 1]->arg);
        idx = 0;
        if (argv_find(argv, argc, "inter-area", &idx))
                o->distance_inter = atoi(argv[idx + 1]->arg);
        idx = 0;
        if (argv_find(argv, argc, "external", &idx))
                o->distance_external = atoi(argv[idx + 1]->arg);

        return CMD_SUCCESS;
}

DEFUN (no_ospf6_distance_ospf6,
       no_ospf6_distance_ospf6_cmd,
       "no distance ospf6 [{intra-area [(1-255)]|inter-area [(1-255)]|external [(1-255)]}]",
       NO_STR
       "Administrative distance\n"
       "OSPF6 distance\n"
       "Intra-area routes\n"
       "Distance for intra-area routes\n"
       "Inter-area routes\n"
       "Distance for inter-area routes\n"
       "External routes\n"
       "Distance for external routes\n")
{
        VTY_DECLVAR_CONTEXT(ospf6, o);
        int idx = 0;

        if (argv_find(argv, argc, "intra-area", &idx) || argc == 3)
                idx = o->distance_intra = 0;
        if (argv_find(argv, argc, "inter-area", &idx) || argc == 3)
                idx = o->distance_inter = 0;
        if (argv_find(argv, argc, "external", &idx) || argc == 3)
                o->distance_external = 0;

        return CMD_SUCCESS;
}

#if 0
DEFUN (ospf6_distance_source,
       ospf6_distance_source_cmd,
       "distance (1-255) X:X::X:X/M [WORD]",
       "Administrative distance\n"
       "Distance value\n"
       "IP source prefix\n"
       "Access list name\n")
{
  VTY_DECLVAR_CONTEXT(ospf6, o);
  char *alname = (argc == 4) ? argv[3]->arg : NULL;
  ospf6_distance_set (vty, o, argv[1]->arg, argv[2]->arg, alname);

  return CMD_SUCCESS;
}

DEFUN (no_ospf6_distance_source,
       no_ospf6_distance_source_cmd,
       "no distance (1-255) X:X::X:X/M [WORD]",
       NO_STR
       "Administrative distance\n"
       "Distance value\n"
       "IP source prefix\n"
       "Access list name\n")
{
  VTY_DECLVAR_CONTEXT(ospf6, o);
  char *alname = (argc == 5) ? argv[4]->arg : NULL;
  ospf6_distance_unset (vty, o, argv[2]->arg, argv[3]->arg, alname);

  return CMD_SUCCESS;
}
#endif

DEFUN (ospf6_interface_area,
       ospf6_interface_area_cmd,
       "interface IFNAME area A.B.C.D",
       "Enable routing on an IPv6 interface\n"
       IFNAME_STR
       "Specify the OSPF6 area ID\n"
       "OSPF6 area ID in IPv4 address notation\n"
      )
{
        VTY_DECLVAR_CONTEXT(ospf6, o);
        int idx_ifname = 1;
        int idx_ipv4 = 3;
        struct ospf6_area *oa;
        struct ospf6_interface *oi;
        struct interface *ifp;
        uint32_t area_id;

        /* find/create ospf6 interface */
        ifp = if_get_by_name(argv[idx_ifname]->arg, VRF_DEFAULT, 0);
        oi = (struct ospf6_interface *)ifp->info;
        if (oi == NULL)
                oi = ospf6_interface_create(ifp);
        if (oi->area) {
                vty_out(vty, "%s already attached to Area %s\n",
                        oi->interface->name, oi->area->name);
                return CMD_SUCCESS;
        }

        /* parse Area-ID */
        if (inet_pton(AF_INET, argv[idx_ipv4]->arg, &area_id) != 1) {
                vty_out(vty, "Invalid Area-ID: %s\n", argv[idx_ipv4]->arg);
                return CMD_SUCCESS;
        }

        /* find/create ospf6 area */
        oa = ospf6_area_lookup(area_id, o);
        if (oa == NULL)
                oa = ospf6_area_create(area_id, o, OSPF6_AREA_FMT_DOTTEDQUAD);

        /* attach interface to area */
        listnode_add(oa->if_list, oi); /* sort ?? */
        oi->area = oa;

        SET_FLAG(oa->flag, OSPF6_AREA_ENABLE);

        /* ospf6 process is currently disabled, not much more to do */
        if (CHECK_FLAG(o->flag, OSPF6_DISABLED))
                return CMD_SUCCESS;

        /* start up */
        ospf6_interface_enable(oi);

        /* If the router is ABR, originate summary routes */
        if (ospf6_is_router_abr(o))
                ospf6_abr_enable_area(oa);

        return CMD_SUCCESS;
}

DEFUN (no_ospf6_interface_area,
       no_ospf6_interface_area_cmd,
       "no interface IFNAME area A.B.C.D",
       NO_STR
       "Disable routing on an IPv6 interface\n"
       IFNAME_STR
       "Specify the OSPF6 area ID\n"
       "OSPF6 area ID in IPv4 address notation\n"
       )
{
        int idx_ifname = 2;
        int idx_ipv4 = 4;
        struct ospf6_interface *oi;
        struct ospf6_area *oa;
        struct interface *ifp;
        uint32_t area_id;

        ifp = if_lookup_by_name(argv[idx_ifname]->arg, VRF_DEFAULT);
        if (ifp == NULL) {
                vty_out(vty, "No such interface %s\n", argv[idx_ifname]->arg);
                return CMD_SUCCESS;
        }

        oi = (struct ospf6_interface *)ifp->info;
        if (oi == NULL) {
                vty_out(vty, "Interface %s not enabled\n", ifp->name);
                return CMD_SUCCESS;
        }

        /* parse Area-ID */
        if (inet_pton(AF_INET, argv[idx_ipv4]->arg, &area_id) != 1) {
                vty_out(vty, "Invalid Area-ID: %s\n", argv[idx_ipv4]->arg);
                return CMD_SUCCESS;
        }

        /* Verify Area */
        if (oi->area == NULL) {
                vty_out(vty, "No such Area-ID: %s\n", argv[idx_ipv4]->arg);
                return CMD_SUCCESS;
        }

        if (oi->area->area_id != area_id) {
                vty_out(vty, "Wrong Area-ID: %s is attached to area %s\n",
                        oi->interface->name, oi->area->name);
                return CMD_SUCCESS;
        }

        thread_execute(master, interface_down, oi, 0);

        oa = oi->area;
        listnode_delete(oi->area->if_list, oi);
        oi->area = (struct ospf6_area *)NULL;

        /* Withdraw inter-area routes from this area, if necessary */
        if (oa->if_list->count == 0) {
                UNSET_FLAG(oa->flag, OSPF6_AREA_ENABLE);
                ospf6_abr_disable_area(oa);
        }

        return CMD_SUCCESS;
}

DEFUN (ospf6_stub_router_admin,
       ospf6_stub_router_admin_cmd,
       "stub-router administrative",
       "Make router a stub router\n"
       "Administratively applied, for an indefinite period\n")
{
        struct listnode *node;
        struct ospf6_area *oa;

        if (!CHECK_FLAG(ospf6->flag, OSPF6_STUB_ROUTER)) {
                for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, oa)) {
                        OSPF6_OPT_CLEAR(oa->options, OSPF6_OPT_V6);
                        OSPF6_OPT_CLEAR(oa->options, OSPF6_OPT_R);
                        OSPF6_ROUTER_LSA_SCHEDULE(oa);
                }
                SET_FLAG(ospf6->flag, OSPF6_STUB_ROUTER);
        }

        return CMD_SUCCESS;
}

DEFUN (no_ospf6_stub_router_admin,
       no_ospf6_stub_router_admin_cmd,
       "no stub-router administrative",
       NO_STR
       "Make router a stub router\n"
       "Administratively applied, for an indefinite period\n")
{
        struct listnode *node;
        struct ospf6_area *oa;

        if (CHECK_FLAG(ospf6->flag, OSPF6_STUB_ROUTER)) {
                for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, oa)) {
                        OSPF6_OPT_SET(oa->options, OSPF6_OPT_V6);
                        OSPF6_OPT_SET(oa->options, OSPF6_OPT_R);
                        OSPF6_ROUTER_LSA_SCHEDULE(oa);
                }
                UNSET_FLAG(ospf6->flag, OSPF6_STUB_ROUTER);
        }

        return CMD_SUCCESS;
}

#if 0
DEFUN (ospf6_stub_router_startup,
       ospf6_stub_router_startup_cmd,
       "stub-router on-startup (5-86400)",
       "Make router a stub router\n"
       "Advertise inability to be a transit router\n"
       "Automatically advertise as stub-router on startup of OSPF6\n"
       "Time (seconds) to advertise self as stub-router\n")
{
  return CMD_SUCCESS;
}

DEFUN (no_ospf6_stub_router_startup,
       no_ospf6_stub_router_startup_cmd,
       "no stub-router on-startup",
       NO_STR
       "Make router a stub router\n"
       "Advertise inability to be a transit router\n"
       "Automatically advertise as stub-router on startup of OSPF6\n"
       "Time (seconds) to advertise self as stub-router\n")
{
  return CMD_SUCCESS;
}

DEFUN (ospf6_stub_router_shutdown,
       ospf6_stub_router_shutdown_cmd,
       "stub-router on-shutdown (5-86400)",
       "Make router a stub router\n"
       "Advertise inability to be a transit router\n"
       "Automatically advertise as stub-router before shutdown\n"
       "Time (seconds) to advertise self as stub-router\n")
{
  return CMD_SUCCESS;
}

DEFUN (no_ospf6_stub_router_shutdown,
       no_ospf6_stub_router_shutdown_cmd,
       "no stub-router on-shutdown",
       NO_STR
       "Make router a stub router\n"
       "Advertise inability to be a transit router\n"
       "Automatically advertise as stub-router before shutdown\n"
       "Time (seconds) to advertise self as stub-router\n")
{
  return CMD_SUCCESS;
}
#endif

static void ospf6_show(struct vty *vty, struct ospf6 *o)
{
        struct listnode *n;
        struct ospf6_area *oa;
        char router_id[16], duration[32];
        struct timeval now, running, result;
        char buf[32], rbuf[32];

        /* process id, router id */
        inet_ntop(AF_INET, &o->router_id, router_id, sizeof(router_id));
        vty_out(vty, " OSPFv3 Routing Process (0) with Router-ID %s\n",
                router_id);

        /* running time */
        monotime(&now);
        timersub(&now, &o->starttime, &running);
        timerstring(&running, duration, sizeof(duration));
        vty_out(vty, " Running %s\n", duration);

        /* Redistribute configuration */
        /* XXX */

        vty_out(vty, " LSA minimum arrival %d msecs\n", o->lsa_minarrival);

        /* Show SPF parameters */
        vty_out(vty,
                " Initial SPF scheduling delay %d millisec(s)\n"
                " Minimum hold time between consecutive SPFs %d millsecond(s)\n"
                " Maximum hold time between consecutive SPFs %d millsecond(s)\n"
                " Hold time multiplier is currently %d\n",
                o->spf_delay, o->spf_holdtime, o->spf_max_holdtime,
                o->spf_hold_multiplier);

        vty_out(vty, " SPF algorithm ");
        if (o->ts_spf.tv_sec || o->ts_spf.tv_usec) {
                timersub(&now, &o->ts_spf, &result);
                timerstring(&result, buf, sizeof(buf));
                ospf6_spf_reason_string(o->last_spf_reason, rbuf, sizeof(rbuf));
                vty_out(vty, "last executed %s ago, reason %s\n", buf, rbuf);
                vty_out(vty, " Last SPF duration %lld sec %lld usec\n",
                        (long long)o->ts_spf_duration.tv_sec,
                        (long long)o->ts_spf_duration.tv_usec);
        } else
                vty_out(vty, "has not been run\n");
        threadtimer_string(now, o->t_spf_calc, buf, sizeof(buf));
        vty_out(vty, " SPF timer %s%s\n", (o->t_spf_calc ? "due in " : "is "),
                buf);

        if (CHECK_FLAG(o->flag, OSPF6_STUB_ROUTER))
                vty_out(vty, " Router Is Stub Router\n");

        /* LSAs */
        vty_out(vty, " Number of AS scoped LSAs is %u\n", o->lsdb->count);

        /* Areas */
        vty_out(vty, " Number of areas in this router is %u\n",
                listcount(o->area_list));

        if (CHECK_FLAG(o->config_flags, OSPF6_LOG_ADJACENCY_CHANGES)) {
                if (CHECK_FLAG(o->config_flags, OSPF6_LOG_ADJACENCY_DETAIL))
                        vty_out(vty, " All adjacency changes are logged\n");
                else
                        vty_out(vty, " Adjacency changes are logged\n");
        }

        vty_out(vty, "\n");

        for (ALL_LIST_ELEMENTS_RO(o->area_list, n, oa))
                ospf6_area_show(vty, oa);
}

/* show top level structures */
DEFUN (show_ipv6_ospf6,
       show_ipv6_ospf6_cmd,
       "show ipv6 ospf6",
       SHOW_STR
       IP6_STR
       OSPF6_STR)
{
        OSPF6_CMD_CHECK_RUNNING();

        ospf6_show(vty, ospf6);
        return CMD_SUCCESS;
}

DEFUN (show_ipv6_ospf6_route,
       show_ipv6_ospf6_route_cmd,
       "show ipv6 ospf6 route [<intra-area|inter-area|external-1|external-2|X:X::X:X|X:X::X:X/M|detail|summary>]",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       ROUTE_STR
       "Display Intra-Area routes\n"
       "Display Inter-Area routes\n"
       "Display Type-1 External routes\n"
       "Display Type-2 External routes\n"
       "Specify IPv6 address\n"
       "Specify IPv6 prefix\n"
       "Detailed information\n"
       "Summary of route table\n")
{
        OSPF6_CMD_CHECK_RUNNING();

        ospf6_route_table_show(vty, 4, argc, argv, ospf6->route_table);
        return CMD_SUCCESS;
}

DEFUN (show_ipv6_ospf6_route_match,
       show_ipv6_ospf6_route_match_cmd,
       "show ipv6 ospf6 route X:X::X:X/M <match|longer>",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       ROUTE_STR
       "Specify IPv6 prefix\n"
       "Display routes which match the specified route\n"
       "Display routes longer than the specified route\n")
{
        OSPF6_CMD_CHECK_RUNNING();

        ospf6_route_table_show(vty, 4, argc, argv, ospf6->route_table);
        return CMD_SUCCESS;
}

DEFUN (show_ipv6_ospf6_route_match_detail,
       show_ipv6_ospf6_route_match_detail_cmd,
       "show ipv6 ospf6 route X:X::X:X/M match detail",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       ROUTE_STR
       "Specify IPv6 prefix\n"
       "Display routes which match the specified route\n"
       "Detailed information\n"
       )
{
        OSPF6_CMD_CHECK_RUNNING();

        ospf6_route_table_show(vty, 4, argc, argv, ospf6->route_table);
        return CMD_SUCCESS;
}


DEFUN (show_ipv6_ospf6_route_type_detail,
       show_ipv6_ospf6_route_type_detail_cmd,
       "show ipv6 ospf6 route <intra-area|inter-area|external-1|external-2> detail",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       ROUTE_STR
       "Display Intra-Area routes\n"
       "Display Inter-Area routes\n"
       "Display Type-1 External routes\n"
       "Display Type-2 External routes\n"
       "Detailed information\n"
       )
{
        OSPF6_CMD_CHECK_RUNNING();

        ospf6_route_table_show(vty, 4, argc, argv, ospf6->route_table);
        return CMD_SUCCESS;
}

static void ospf6_stub_router_config_write(struct vty *vty)
{
        if (CHECK_FLAG(ospf6->flag, OSPF6_STUB_ROUTER)) {
                vty_out(vty, " stub-router administrative\n");
        }
        return;
}

static int ospf6_distance_config_write(struct vty *vty)
{
        struct route_node *rn;
        struct ospf6_distance *odistance;

        if (ospf6->distance_all)
                vty_out(vty, " distance %u\n", ospf6->distance_all);

        if (ospf6->distance_intra || ospf6->distance_inter
            || ospf6->distance_external) {
                vty_out(vty, " distance ospf6");

                if (ospf6->distance_intra)
                        vty_out(vty, " intra-area %u", ospf6->distance_intra);
                if (ospf6->distance_inter)
                        vty_out(vty, " inter-area %u", ospf6->distance_inter);
                if (ospf6->distance_external)
                        vty_out(vty, " external %u", ospf6->distance_external);

                vty_out(vty, "\n");
        }

        for (rn = route_top(ospf6->distance_table); rn; rn = route_next(rn))
                if ((odistance = rn->info) != NULL) {
                        char buf[PREFIX_STRLEN];

                        vty_out(vty, " distance %u %s %s\n",
                                odistance->distance,
                                prefix2str(&rn->p, buf, sizeof(buf)),
                                odistance->access_list ? odistance->access_list
                                                       : "");
                }
        return 0;
}

/* OSPF configuration write function. */
static int config_write_ospf6(struct vty *vty)
{
        char router_id[16];
        struct listnode *j, *k;
        struct ospf6_area *oa;
        struct ospf6_interface *oi;

        /* OSPFv3 configuration. */
        if (ospf6 == NULL)
                return CMD_SUCCESS;

        inet_ntop(AF_INET, &ospf6->router_id_static, router_id,
                  sizeof(router_id));
        vty_out(vty, "router ospf6\n");
        if (ospf6->router_id_static != 0)
                vty_out(vty, " ospf6 router-id %s\n", router_id);

        /* log-adjacency-changes flag print. */
        if (CHECK_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES)) {
                if (CHECK_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL))
                        vty_out(vty, " log-adjacency-changes detail\n");
                else if (!DFLT_OSPF6_LOG_ADJACENCY_CHANGES)
                        vty_out(vty, " log-adjacency-changes\n");
        } else if (DFLT_OSPF6_LOG_ADJACENCY_CHANGES) {
                vty_out(vty, " no log-adjacency-changes\n");
        }

        if (ospf6->ref_bandwidth != OSPF6_REFERENCE_BANDWIDTH)
                vty_out(vty, " auto-cost reference-bandwidth %d\n",
                        ospf6->ref_bandwidth);

        /* LSA timers print. */
        if (ospf6->lsa_minarrival != OSPF_MIN_LS_ARRIVAL)
                vty_out(vty, " timers lsa min-arrival %d\n",
                        ospf6->lsa_minarrival);

        ospf6_stub_router_config_write(vty);
        ospf6_redistribute_config_write(vty);
        ospf6_area_config_write(vty);
        ospf6_spf_config_write(vty);
        ospf6_distance_config_write(vty);

        for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, j, oa)) {
                for (ALL_LIST_ELEMENTS_RO(oa->if_list, k, oi))
                        vty_out(vty, " interface %s area %s\n",
                                oi->interface->name, oa->name);
        }
        vty_out(vty, "!\n");
        return 0;
}

/* OSPF6 node structure. */
static struct cmd_node ospf6_node = {
        OSPF6_NODE, "%s(config-ospf6)# ", 1 /* VTYSH */
};

/* Install ospf related commands. */
void ospf6_top_init(void)
{
        /* Install ospf6 top node. */
        install_node(&ospf6_node, config_write_ospf6);

        install_element(VIEW_NODE, &show_ipv6_ospf6_cmd);
        install_element(CONFIG_NODE, &router_ospf6_cmd);
        install_element(CONFIG_NODE, &no_router_ospf6_cmd);

        install_element(VIEW_NODE, &show_ipv6_ospf6_route_cmd);
        install_element(VIEW_NODE, &show_ipv6_ospf6_route_match_cmd);
        install_element(VIEW_NODE, &show_ipv6_ospf6_route_match_detail_cmd);
        install_element(VIEW_NODE, &show_ipv6_ospf6_route_type_detail_cmd);

        install_default(OSPF6_NODE);
        install_element(OSPF6_NODE, &ospf6_router_id_cmd);
        install_element(OSPF6_NODE, &no_ospf6_router_id_cmd);
        install_element(OSPF6_NODE, &ospf6_router_id_hdn_cmd);
        install_element(OSPF6_NODE, &no_ospf6_router_id_hdn_cmd);
        install_element(OSPF6_NODE, &ospf6_log_adjacency_changes_cmd);
        install_element(OSPF6_NODE, &ospf6_log_adjacency_changes_detail_cmd);
        install_element(OSPF6_NODE, &no_ospf6_log_adjacency_changes_cmd);
        install_element(OSPF6_NODE, &no_ospf6_log_adjacency_changes_detail_cmd);

        /* LSA timers commands */
        install_element(OSPF6_NODE, &ospf6_timers_lsa_cmd);
        install_element(OSPF6_NODE, &no_ospf6_timers_lsa_cmd);

        install_element(OSPF6_NODE, &ospf6_interface_area_cmd);
        install_element(OSPF6_NODE, &no_ospf6_interface_area_cmd);
        install_element(OSPF6_NODE, &ospf6_stub_router_admin_cmd);
        install_element(OSPF6_NODE, &no_ospf6_stub_router_admin_cmd);
/* For a later time */
#if 0
  install_element (OSPF6_NODE, &ospf6_stub_router_startup_cmd);
  install_element (OSPF6_NODE, &no_ospf6_stub_router_startup_cmd);
  install_element (OSPF6_NODE, &ospf6_stub_router_shutdown_cmd);
  install_element (OSPF6_NODE, &no_ospf6_stub_router_shutdown_cmd);
#endif

        install_element(OSPF6_NODE, &ospf6_distance_cmd);
        install_element(OSPF6_NODE, &no_ospf6_distance_cmd);
        install_element(OSPF6_NODE, &ospf6_distance_ospf6_cmd);
        install_element(OSPF6_NODE, &no_ospf6_distance_ospf6_cmd);
#if 0
  install_element (OSPF6_NODE, &ospf6_distance_source_cmd);
  install_element (OSPF6_NODE, &no_ospf6_distance_source_cmd);
#endif
}