*: require semicolon after FRR_DAEMON_INFO & co.

[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 "lib/json.h"
#include "lib_errors.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_network.h"

#include "ospf6_flood.h"
#include "ospf6_asbr.h"
#include "ospf6_abr.h"
#include "ospf6_intra.h"
#include "ospf6_spf.h"
#include "ospf6d.h"
#include "lib/json.h"

DEFINE_QOBJ_TYPE(ospf6);

FRR_CFG_DEFAULT_BOOL(OSPF6_LOG_ADJACENCY_CHANGES,
	{ .val_bool = true, .match_profile = "datacenter", },
	{ .val_bool = false },
)

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

static void ospf6_disable(struct ospf6 *o);

static void ospf6_add(struct ospf6 *ospf6)
{
	listnode_add(om6->ospf6, ospf6);
}

static void ospf6_del(struct ospf6 *ospf6)
{
	listnode_delete(om6->ospf6, ospf6);
}

const char *ospf6_vrf_id_to_name(vrf_id_t vrf_id)
{
	struct vrf *vrf = vrf_lookup_by_id(vrf_id);

	return vrf ? vrf->name : "NIL";
}

/* Link OSPF instance to VRF. */
void ospf6_vrf_link(struct ospf6 *ospf6, struct vrf *vrf)
{
	ospf6->vrf_id = vrf->vrf_id;
	if (vrf->info != (void *)ospf6)
		vrf->info = (void *)ospf6;
}

/* Unlink OSPF instance from VRF. */
void ospf6_vrf_unlink(struct ospf6 *ospf6, struct vrf *vrf)
{
	if (vrf->info == (void *)ospf6)
		vrf->info = NULL;
	ospf6->vrf_id = VRF_UNKNOWN;
}

struct ospf6 *ospf6_lookup_by_vrf_id(vrf_id_t vrf_id)
{
	struct vrf *vrf = NULL;

	vrf = vrf_lookup_by_id(vrf_id);
	if (!vrf)
		return NULL;
	return (vrf->info) ? (struct ospf6 *)vrf->info : NULL;
}

struct ospf6 *ospf6_lookup_by_vrf_name(const char *name)
{
	struct ospf6 *o = NULL;
	struct listnode *node, *nnode;

	for (ALL_LIST_ELEMENTS(om6->ospf6, node, nnode, o)) {
		if (((o->name == NULL && name == NULL)
		     || (o->name && name && strcmp(o->name, name) == 0)))
			return o;
	}
	return NULL;
}


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)
{
	struct ospf6 *ospf6 = route->table->scope;

	ospf6_abr_originate_summary(route, ospf6);
	ospf6_zebra_route_update_add(route, ospf6);
}

static void ospf6_top_route_hook_remove(struct ospf6_route *route)
{
	struct ospf6 *ospf6 = route->table->scope;

	route->flag |= OSPF6_ROUTE_REMOVE;
	ospf6_abr_originate_summary(route, ospf6);
	ospf6_zebra_route_update_remove(route, ospf6);
}

static void ospf6_top_brouter_hook_add(struct ospf6_route *route)
{
	struct ospf6 *ospf6 = route->table->scope;

	if (IS_OSPF6_DEBUG_EXAMIN(AS_EXTERNAL) ||
	    IS_OSPF6_DEBUG_BROUTER) {
		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",
			   __func__, brouter_name,
			   route->path.origin.adv_router,
			   listcount(route->nh_list));
	}
	ospf6_abr_examin_brouter(ADV_ROUTER_IN_PREFIX(&route->prefix), route,
				 ospf6);
	ospf6_asbr_lsentry_add(route, ospf6);
	ospf6_abr_originate_summary(route, ospf6);
}

static void ospf6_top_brouter_hook_remove(struct ospf6_route *route)
{
	struct ospf6 *ospf6 = route->table->scope;

	if (IS_OSPF6_DEBUG_EXAMIN(AS_EXTERNAL) ||
	    IS_OSPF6_DEBUG_BROUTER) {
		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 %p %s del with adv router %x nh %u",
			   __func__, (void *)route, brouter_name,
			   route->path.origin.adv_router,
			   listcount(route->nh_list));
	}
	route->flag |= OSPF6_ROUTE_REMOVE;
	ospf6_abr_examin_brouter(ADV_ROUTER_IN_PREFIX(&route->prefix), route,
				 ospf6);
	ospf6_asbr_lsentry_remove(route, ospf6);
	ospf6_abr_originate_summary(route, ospf6);
}

static struct ospf6 *ospf6_create(const char *name)
{
	struct ospf6 *o;
	struct vrf *vrf = NULL;

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

	vrf = vrf_lookup_by_name(name);
	if (vrf) {
		o->vrf_id = vrf->vrf_id;
	} else
		o->vrf_id = VRF_UNKNOWN;

	/* Freed in ospf6_delete */
	o->name = XSTRDUP(MTYPE_OSPF6_TOP, name);
	if (vrf)
		ospf6_vrf_link(o, vrf);

	ospf6_zebra_vrf_register(o);

	/* 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();
	o->fd = -1;

	o->max_multipath = MULTIPATH_NUM;

	QOBJ_REG(o, ospf6);

	/* Make ospf protocol socket. */
	ospf6_serv_sock(o);

	return o;
}

struct ospf6 *ospf6_instance_create(const char *name)
{
	struct ospf6 *ospf6;

	ospf6 = ospf6_create(name);
	if (DFLT_OSPF6_LOG_ADJACENCY_CHANGES)
		SET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
	if (ospf6->router_id == 0)
		ospf6_router_id_update(ospf6);
	ospf6_add(ospf6);
	thread_add_read(master, ospf6_receive, ospf6, ospf6->fd,
			&ospf6->t_ospf6_receive);

	return ospf6;
}

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

	QOBJ_UNREG(o);

	ospf6_flush_self_originated_lsas_now(o);
	ospf6_disable(o);
	ospf6_del(o);

	ospf6_serv_close(&o->fd);

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


	list_delete(&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->name);
	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 */
		/* Unregister redistribution */
		ospf6_asbr_redistribute_reset(o);

		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);
		THREAD_OFF(o->t_ospf6_receive);
	}
}

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

	om6 = &ospf6_master;
	om6->ospf6 = list_new();
	om6->master = 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(struct ospf6 *ospf6)
{
	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)
{
	struct ospf6 *ospf6;

	ospf6 = ospf6_lookup_by_vrf_name(VRF_DEFAULT_NAME);
	if (ospf6 == NULL)
		ospf6 = ospf6_instance_create(VRF_DEFAULT_NAME);

	/* 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)
{
	struct ospf6 *ospf6;

	ospf6 = ospf6_lookup_by_vrf_name(VRF_DEFAULT_NAME);
	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;
}

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;
}

DEFUN (ospf6_interface_area,
       ospf6_interface_area_cmd,
       "interface IFNAME area <A.B.C.D|(0-4294967295)>",
       "Enable routing on an IPv6 interface\n"
       IFNAME_STR
       "Specify the OSPF6 area ID\n"
       "OSPF6 area ID in IPv4 address notation\n"
       "OSPF6 area ID in decimal notation\n"
      )
{
	int idx_ifname = 1;
	int idx_ipv4 = 3;
	struct ospf6_area *oa;
	struct ospf6_interface *oi;
	struct interface *ifp;

	VTY_DECLVAR_CONTEXT(ospf6, ospf6);

	/* find/create ospf6 interface */
	ifp = if_get_by_name(argv[idx_ifname]->arg, VRF_DEFAULT);
	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 */
	OSPF6_CMD_AREA_GET(argv[idx_ipv4]->arg, oa, ospf6);

	/* 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(ospf6->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(ospf6))
		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|(0-4294967295)>",
       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"
       "OSPF6 area ID in decimal 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)
		area_id = htonl(strtoul(argv[idx_ipv4]->arg, NULL, 10));

	/* 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;
	}

	ospf6_interface_disable(oi);

	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);
	}
	ospf6_interface_delete(oi);

	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;

	VTY_DECLVAR_CONTEXT(ospf6, ospf6);

	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;

	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
	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;
}

/* Restart OSPF SPF algorithm*/
static void ospf6_restart_spf(struct ospf6 *ospf6)
{
	ospf6_route_remove_all(ospf6->route_table);
	ospf6_route_remove_all(ospf6->brouter_table);
	ospf6_route_remove_all(ospf6->external_table);

	/* Trigger SPF */
	ospf6_spf_schedule(ospf6, OSPF6_SPF_FLAGS_CONFIG_CHANGE);
}

/* Set the max paths */
static void ospf6_maxpath_set(struct ospf6 *ospf6, uint16_t paths)
{
	if (ospf6->max_multipath == paths)
		return;

	ospf6->max_multipath = paths;

	/* Send deletion to zebra to delete all
	 * ospf specific routes and reinitiate
	 * SPF to reflect the new max multipath.
	 */
	ospf6_restart_spf(ospf6);
}

/* Ospf Maximum-paths config support */
DEFUN(ospf6_max_multipath,
      ospf6_max_multipath_cmd,
      "maximum-paths " CMD_RANGE_STR(1, MULTIPATH_NUM),
      "Max no of multiple paths for ECMP support\n"
      "Number of paths\n")
{
	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
	int idx_number = 1;
	int maximum_paths = strtol(argv[idx_number]->arg, NULL, 10);

	ospf6_maxpath_set(ospf6, maximum_paths);

	return CMD_SUCCESS;
}

DEFUN(no_ospf6_max_multipath,
      no_ospf6_max_multipath_cmd,
     "no maximum-paths [" CMD_RANGE_STR(1, MULTIPATH_NUM)"]",
      NO_STR
      "Max no of multiple paths for ECMP support\n"
      "Number of paths\n")
{
	VTY_DECLVAR_CONTEXT(ospf6, ospf6);

	ospf6_maxpath_set(ospf6, MULTIPATH_NUM);

	return CMD_SUCCESS;
}

static void ospf6_show(struct vty *vty, struct ospf6 *o, json_object *json,
		       bool use_json)
{
	struct listnode *n;
	struct ospf6_area *oa;
	char router_id[16], duration[32];
	struct timeval now, running, result;
	char buf[32], rbuf[32];
	json_object *json_areas = NULL;
	const char *adjacency;

	if (use_json) {
		json_areas = json_object_new_object();

		/* process id, router id */
		inet_ntop(AF_INET, &o->router_id, router_id, sizeof(router_id));
		json_object_string_add(json, "routerId", router_id);

		/* running time */
		monotime(&now);
		timersub(&now, &o->starttime, &running);
		timerstring(&running, duration, sizeof(duration));
		json_object_string_add(json, "running", duration);

		/* Redistribute configuration */
		/* XXX */
		json_object_int_add(json, "lsaMinimumArrivalMsecs",
				    o->lsa_minarrival);

		/* Show SPF parameters */
		json_object_int_add(json, "spfScheduleDelayMsecs",
				    o->spf_delay);
		json_object_int_add(json, "holdTimeMinMsecs", o->spf_holdtime);
		json_object_int_add(json, "holdTimeMaxMsecs",
				    o->spf_max_holdtime);
		json_object_int_add(json, "holdTimeMultiplier",
				    o->spf_hold_multiplier);

		json_object_int_add(json, "maximumPaths", o->max_multipath);

		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));
			json_object_boolean_true_add(json, "spfHasRun");
			json_object_string_add(json, "spfLastExecutedMsecs",
					       buf);
			json_object_string_add(json, "spfLastExecutedReason",
					       rbuf);

			json_object_int_add(
				json, "spfLastDurationSecs",
				(long long)o->ts_spf_duration.tv_sec);

			json_object_int_add(
				json, "spfLastDurationMsecs",
				(long long)o->ts_spf_duration.tv_usec);
		} else
			json_object_boolean_false_add(json, "spfHasRun");


		threadtimer_string(now, o->t_spf_calc, buf, sizeof(buf));
		if (o->t_spf_calc) {
			long time_store;

			json_object_boolean_true_add(json, "spfTimerActive");
			time_store =
				monotime_until(&o->t_spf_calc->u.sands, NULL)
				/ 1000LL;
			json_object_int_add(json, "spfTimerDueInMsecs",
					    time_store);
		} else
			json_object_boolean_false_add(json, "spfTimerActive");

		json_object_boolean_add(json, "routerIsStubRouter",
					CHECK_FLAG(o->flag, OSPF6_STUB_ROUTER));

		/* LSAs */
		json_object_int_add(json, "numberOfAsScopedLsa",
				    o->lsdb->count);
		/* Areas */
		json_object_int_add(json, "numberOfAreaInRouter",
				    listcount(o->area_list));

		if (CHECK_FLAG(o->config_flags, OSPF6_LOG_ADJACENCY_CHANGES)) {
			if (CHECK_FLAG(o->config_flags,
				       OSPF6_LOG_ADJACENCY_DETAIL))
				adjacency = "LoggedAll";
			else
				adjacency = "Logged";
		} else
			adjacency = "NotLogged";
		json_object_string_add(json, "adjacencyChanges", adjacency);

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

		json_object_object_add(json, "areas", json_areas);

		vty_out(vty, "%s\n",
			json_object_to_json_string_ext(
				json, JSON_C_TO_STRING_PRETTY));

	} else {
		/* 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);

		vty_out(vty, " Maximum-paths %u\n", o->max_multipath);

		/* 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, json_areas, use_json);
	}
}

/* show top level structures */
DEFUN(show_ipv6_ospf6,
      show_ipv6_ospf6_cmd,
      "show ipv6 ospf6 [json]",
      SHOW_STR
      IP6_STR
      OSPF6_STR
      JSON_STR)
{
	struct ospf6 *ospf6;
	bool uj = use_json(argc, argv);
	json_object *json = NULL;

	ospf6 = ospf6_lookup_by_vrf_name(VRF_DEFAULT_NAME);
	OSPF6_CMD_CHECK_RUNNING(ospf6);

	if (uj)
		json = json_object_new_object();

	ospf6_show(vty, ospf6, json, uj);

	if (uj)
		json_object_free(json);
	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>] [json]",
       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"
       JSON_STR)
{
	struct ospf6 *ospf6;
	bool uj = use_json(argc, argv);

	ospf6 = ospf6_lookup_by_vrf_name(VRF_DEFAULT_NAME);
	OSPF6_CMD_CHECK_RUNNING(ospf6);

	ospf6_route_table_show(vty, 4, argc, argv, ospf6->route_table, uj);
	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> [json]",
       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"
       JSON_STR)
{
	struct ospf6 *ospf6;
	bool uj = use_json(argc, argv);

	ospf6 = ospf6_lookup_by_vrf_name(VRF_DEFAULT_NAME);
	OSPF6_CMD_CHECK_RUNNING(ospf6);

	ospf6_route_table_show(vty, 4, argc, argv, ospf6->route_table, uj);
	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 [json]",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       ROUTE_STR
       "Specify IPv6 prefix\n"
       "Display routes which match the specified route\n"
       "Detailed information\n"
       JSON_STR)
{
	struct ospf6 *ospf6;
	bool uj = use_json(argc, argv);

	ospf6 = ospf6_lookup_by_vrf_name(VRF_DEFAULT_NAME);
	OSPF6_CMD_CHECK_RUNNING(ospf6);

	ospf6_route_table_show(vty, 4, argc, argv, ospf6->route_table, uj);
	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 [json]",
       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"
       JSON_STR)
{
	struct ospf6 *ospf6;
	bool uj = use_json(argc, argv);

	ospf6 = ospf6_lookup_by_vrf_name(VRF_DEFAULT_NAME);
	OSPF6_CMD_CHECK_RUNNING(ospf6);

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

static void ospf6_stub_router_config_write(struct vty *vty, struct ospf6 *ospf6)
{
	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 ospf6 *ospf6)
{
	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)
			vty_out(vty, " distance %u %pFX %s\n",
				odistance->distance, &rn->p,
				odistance->access_list ? odistance->access_list
						       : "");
	return 0;
}

/* OSPF configuration write function. */
static int config_write_ospf6(struct vty *vty)
{
	struct listnode *j, *k;
	struct ospf6_area *oa;
	struct ospf6_interface *oi;
	struct ospf6 *ospf6;
	struct listnode *node, *nnode;

	/* OSPFv3 configuration. */
	if (om6 == NULL)
		return CMD_SUCCESS;

	for (ALL_LIST_ELEMENTS(om6->ospf6, node, nnode, ospf6)) {
		vty_out(vty, "router ospf6\n");
		if (ospf6->router_id_static != 0)
			vty_out(vty, " ospf6 router-id %pI4\n",
				&ospf6->router_id_static);

		/* 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 (!SAVE_OSPF6_LOG_ADJACENCY_CHANGES)
				vty_out(vty, " log-adjacency-changes\n");
		} else if (SAVE_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);

		/* ECMP max path config */
		if (ospf6->max_multipath != MULTIPATH_NUM)
			vty_out(vty, " maximum-paths %d\n",
				ospf6->max_multipath);

		ospf6_stub_router_config_write(vty, ospf6);
		ospf6_redistribute_config_write(vty, ospf6);
		ospf6_area_config_write(vty, ospf6);
		ospf6_spf_config_write(vty, ospf6);
		ospf6_distance_config_write(vty, ospf6);

		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;
}

static int config_write_ospf6(struct vty *vty);
/* OSPF6 node structure. */
static struct cmd_node ospf6_node = {
	.name = "ospf6",
	.node = OSPF6_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-ospf6)# ",
	.config_write = config_write_ospf6,
};

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

	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_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);

	/* maximum-paths command */
	install_element(OSPF6_NODE, &ospf6_max_multipath_cmd);
	install_element(OSPF6_NODE, &no_ospf6_max_multipath_cmd);

	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);
}