/*
 * 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 "memory.h"
#include "if.h"
#include "log.h"
#include "command.h"
#include "thread.h"
#include "prefix.h"
#include "plist.h"
#include "zclient.h"

#include "ospf6_lsa.h"
#include "ospf6_lsdb.h"
#include "ospf6_top.h"
#include "ospf6_network.h"
#include "ospf6_message.h"
#include "ospf6_route.h"
#include "ospf6_area.h"
#include "ospf6_interface.h"
#include "ospf6_neighbor.h"
#include "ospf6_intra.h"
#include "ospf6_spf.h"
#include "ospf6d.h"
#include "ospf6_bfd.h"
#include "ospf6_zebra.h"

DEFINE_MTYPE_STATIC(OSPF6D, CFG_PLIST_NAME, "configured prefix list names")
DEFINE_QOBJ_TYPE(ospf6_interface)
DEFINE_HOOK(ospf6_interface_change,
	    (struct ospf6_interface * oi, int state, int old_state),
	    (oi, state, old_state))

unsigned char conf_debug_ospf6_interface = 0;

const char *const ospf6_interface_state_str[] = {
	"None",    "Down", "Loopback", "Waiting", "PointToPoint",
	"DROther", "BDR",  "DR",       NULL};

struct ospf6_interface *ospf6_interface_lookup_by_ifindex(ifindex_t ifindex,
							  vrf_id_t vrf_id)
{
	struct ospf6_interface *oi;
	struct interface *ifp;

	ifp = if_lookup_by_index(ifindex, vrf_id);
	if (ifp == NULL)
		return (struct ospf6_interface *)NULL;

	oi = (struct ospf6_interface *)ifp->info;
	return oi;
}

/* schedule routing table recalculation */
static void ospf6_interface_lsdb_hook(struct ospf6_lsa *lsa,
				      unsigned int reason)
{
	struct ospf6_interface *oi;

	if (lsa == NULL)
		return;

	oi = lsa->lsdb->data;
	switch (ntohs(lsa->header->type)) {
	case OSPF6_LSTYPE_LINK:
		if (oi->state == OSPF6_INTERFACE_DR)
			OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
		if (oi->area)
			ospf6_spf_schedule(oi->area->ospf6, reason);
		break;

	default:
		break;
	}
}

static void ospf6_interface_lsdb_hook_add(struct ospf6_lsa *lsa)
{
	ospf6_interface_lsdb_hook(lsa, ospf6_lsadd_to_spf_reason(lsa));
}

static void ospf6_interface_lsdb_hook_remove(struct ospf6_lsa *lsa)
{
	ospf6_interface_lsdb_hook(lsa, ospf6_lsremove_to_spf_reason(lsa));
}

static uint8_t ospf6_default_iftype(struct interface *ifp)
{
	if (if_is_pointopoint(ifp))
		return OSPF_IFTYPE_POINTOPOINT;
	else if (if_is_loopback(ifp))
		return OSPF_IFTYPE_LOOPBACK;
	else
		return OSPF_IFTYPE_BROADCAST;
}

static uint32_t ospf6_interface_get_cost(struct ospf6_interface *oi)
{
	/* If all else fails, use default OSPF cost */
	uint32_t cost;
	uint32_t bw, refbw;

	/* interface speed and bw can be 0 in some platforms,
	 * use ospf default bw. If bw is configured then it would
	 * be used.
	 */
	if (!oi->interface->bandwidth && oi->interface->speed) {
		bw = oi->interface->speed;
	} else {
		bw = oi->interface->bandwidth ? oi->interface->bandwidth
					      : OSPF6_INTERFACE_BANDWIDTH;
	}

	refbw = ospf6 ? ospf6->ref_bandwidth : OSPF6_REFERENCE_BANDWIDTH;

	/* A specifed ip ospf cost overrides a calculated one. */
	if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST))
		cost = oi->cost;
	else {
		cost = (uint32_t)((double)refbw / (double)bw + (double)0.5);
		if (cost < 1)
			cost = 1;
		else if (cost > UINT32_MAX)
			cost = UINT32_MAX;
	}

	return cost;
}

static void ospf6_interface_force_recalculate_cost(struct ospf6_interface *oi)
{
	/* update cost held in route_connected list in ospf6_interface */
	ospf6_interface_connected_route_update(oi->interface);

	/* execute LSA hooks */
	if (oi->area) {
		OSPF6_LINK_LSA_SCHEDULE(oi);
		OSPF6_ROUTER_LSA_SCHEDULE(oi->area);
		OSPF6_NETWORK_LSA_SCHEDULE(oi);
		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
	}
}

static void ospf6_interface_recalculate_cost(struct ospf6_interface *oi)
{
	uint32_t newcost;

	newcost = ospf6_interface_get_cost(oi);
	if (newcost == oi->cost)
		return;
	oi->cost = newcost;

	ospf6_interface_force_recalculate_cost(oi);
}

/* Create new ospf6 interface structure */
struct ospf6_interface *ospf6_interface_create(struct interface *ifp)
{
	struct ospf6_interface *oi;
	unsigned int iobuflen;

	oi = XCALLOC(MTYPE_OSPF6_IF, sizeof(struct ospf6_interface));

	oi->area = (struct ospf6_area *)NULL;
	oi->neighbor_list = list_new();
	oi->neighbor_list->cmp = ospf6_neighbor_cmp;
	oi->linklocal_addr = (struct in6_addr *)NULL;
	oi->instance_id = OSPF6_INTERFACE_INSTANCE_ID;
	oi->transdelay = OSPF6_INTERFACE_TRANSDELAY;
	oi->priority = OSPF6_INTERFACE_PRIORITY;

	oi->hello_interval = OSPF_HELLO_INTERVAL_DEFAULT;
	oi->dead_interval = OSPF_ROUTER_DEAD_INTERVAL_DEFAULT;
	oi->rxmt_interval = OSPF_RETRANSMIT_INTERVAL_DEFAULT;
	oi->type = ospf6_default_iftype(ifp);
	oi->state = OSPF6_INTERFACE_DOWN;
	oi->flag = 0;
	oi->mtu_ignore = 0;
	oi->c_ifmtu = 0;

	/* Try to adjust I/O buffer size with IfMtu */
	oi->ifmtu = ifp->mtu6;
	iobuflen = ospf6_iobuf_size(ifp->mtu6);
	if (oi->ifmtu > iobuflen) {
		if (IS_OSPF6_DEBUG_INTERFACE)
			zlog_debug(
				"Interface %s: IfMtu is adjusted to I/O buffer size: %d.",
				ifp->name, iobuflen);
		oi->ifmtu = iobuflen;
	}

	QOBJ_REG(oi, ospf6_interface);

	oi->lsupdate_list = ospf6_lsdb_create(oi);
	oi->lsack_list = ospf6_lsdb_create(oi);
	oi->lsdb = ospf6_lsdb_create(oi);
	oi->lsdb->hook_add = ospf6_interface_lsdb_hook_add;
	oi->lsdb->hook_remove = ospf6_interface_lsdb_hook_remove;
	oi->lsdb_self = ospf6_lsdb_create(oi);

	oi->route_connected =
		OSPF6_ROUTE_TABLE_CREATE(INTERFACE, CONNECTED_ROUTES);
	oi->route_connected->scope = oi;

	/* link both */
	oi->interface = ifp;
	ifp->info = oi;

	/* Compute cost. */
	oi->cost = ospf6_interface_get_cost(oi);

	return oi;
}

void ospf6_interface_delete(struct ospf6_interface *oi)
{
	struct listnode *node, *nnode;
	struct ospf6_neighbor *on;

	QOBJ_UNREG(oi);

	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
		ospf6_neighbor_delete(on);

	list_delete(&oi->neighbor_list);

	THREAD_OFF(oi->thread_send_hello);
	THREAD_OFF(oi->thread_send_lsupdate);
	THREAD_OFF(oi->thread_send_lsack);
	THREAD_OFF(oi->thread_sso);

	ospf6_lsdb_remove_all(oi->lsdb);
	ospf6_lsdb_remove_all(oi->lsupdate_list);
	ospf6_lsdb_remove_all(oi->lsack_list);

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

	ospf6_lsdb_delete(oi->lsupdate_list);
	ospf6_lsdb_delete(oi->lsack_list);

	ospf6_route_table_delete(oi->route_connected);

	/* cut link */
	oi->interface->info = NULL;

	/* plist_name */
	if (oi->plist_name)
		XFREE(MTYPE_CFG_PLIST_NAME, oi->plist_name);

	ospf6_bfd_info_free(&(oi->bfd_info));

	/* disable from area list if possible */
	ospf6_area_interface_delete(oi);

	XFREE(MTYPE_OSPF6_IF, oi);
}

void ospf6_interface_enable(struct ospf6_interface *oi)
{
	UNSET_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE);
	ospf6_interface_state_update(oi->interface);
}

void ospf6_interface_disable(struct ospf6_interface *oi)
{
	SET_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE);

	thread_execute(master, interface_down, oi, 0);

	ospf6_lsdb_remove_all(oi->lsdb);
	ospf6_lsdb_remove_all(oi->lsdb_self);
	ospf6_lsdb_remove_all(oi->lsupdate_list);
	ospf6_lsdb_remove_all(oi->lsack_list);

	THREAD_OFF(oi->thread_send_hello);
	THREAD_OFF(oi->thread_send_lsupdate);
	THREAD_OFF(oi->thread_send_lsack);
	THREAD_OFF(oi->thread_sso);

	THREAD_OFF(oi->thread_network_lsa);
	THREAD_OFF(oi->thread_link_lsa);
	THREAD_OFF(oi->thread_intra_prefix_lsa);
	THREAD_OFF(oi->thread_as_extern_lsa);
}

static struct in6_addr *
ospf6_interface_get_linklocal_address(struct interface *ifp)
{
	struct listnode *n;
	struct connected *c;
	struct in6_addr *l = (struct in6_addr *)NULL;

	/* for each connected address */
	for (ALL_LIST_ELEMENTS_RO(ifp->connected, n, c)) {
		/* if family not AF_INET6, ignore */
		if (c->address->family != AF_INET6)
			continue;

		/* linklocal scope check */
		if (IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6))
			l = &c->address->u.prefix6;
	}
	return l;
}

void ospf6_interface_if_add(struct interface *ifp)
{
	struct ospf6_interface *oi;
	unsigned int iobuflen;

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		return;

	/* Try to adjust I/O buffer size with IfMtu */
	if (oi->ifmtu == 0)
		oi->ifmtu = ifp->mtu6;
	iobuflen = ospf6_iobuf_size(ifp->mtu6);
	if (oi->ifmtu > iobuflen) {
		if (IS_OSPF6_DEBUG_INTERFACE)
			zlog_debug(
				"Interface %s: IfMtu is adjusted to I/O buffer size: %d.",
				ifp->name, iobuflen);
		oi->ifmtu = iobuflen;
	}

	/* interface start */
	ospf6_interface_state_update(oi->interface);
}

void ospf6_interface_state_update(struct interface *ifp)
{
	struct ospf6_interface *oi;
	unsigned int iobuflen;

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		return;
	if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE))
		return;

	/* Adjust the mtu values if the kernel told us something new */
	if (ifp->mtu6 != oi->ifmtu) {
		/* If nothing configured, accept it and check for buffer size */
		if (!oi->c_ifmtu) {
			oi->ifmtu = ifp->mtu6;
			iobuflen = ospf6_iobuf_size(ifp->mtu6);
			if (oi->ifmtu > iobuflen) {
				if (IS_OSPF6_DEBUG_INTERFACE)
					zlog_debug(
						"Interface %s: IfMtu is adjusted to I/O buffer size: %d.",
						ifp->name, iobuflen);
				oi->ifmtu = iobuflen;
			}
		} else if (oi->c_ifmtu > ifp->mtu6) {
			oi->ifmtu = ifp->mtu6;
			zlog_warn(
				"Configured mtu %u on %s overridden by kernel %u",
				oi->c_ifmtu, ifp->name, ifp->mtu6);
		} else
			oi->ifmtu = oi->c_ifmtu;
	}

	if (if_is_operative(ifp)
	    && (ospf6_interface_get_linklocal_address(oi->interface)
		|| if_is_loopback(oi->interface)))
		thread_execute(master, interface_up, oi, 0);
	else
		thread_execute(master, interface_down, oi, 0);

	return;
}

void ospf6_interface_connected_route_update(struct interface *ifp)
{
	struct ospf6_interface *oi;
	struct ospf6_route *route;
	struct connected *c;
	struct listnode *node, *nnode;
	struct in6_addr nh_addr;

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		return;

	/* reset linklocal pointer */
	oi->linklocal_addr = ospf6_interface_get_linklocal_address(ifp);

	/* if area is null, do not make connected-route list */
	if (oi->area == NULL)
		return;

	if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE))
		return;

	/* update "route to advertise" interface route table */
	ospf6_route_remove_all(oi->route_connected);

	for (ALL_LIST_ELEMENTS(oi->interface->connected, node, nnode, c)) {
		if (c->address->family != AF_INET6)
			continue;

		CONTINUE_IF_ADDRESS_LINKLOCAL(IS_OSPF6_DEBUG_INTERFACE,
					      c->address);
		CONTINUE_IF_ADDRESS_UNSPECIFIED(IS_OSPF6_DEBUG_INTERFACE,
						c->address);
		CONTINUE_IF_ADDRESS_LOOPBACK(IS_OSPF6_DEBUG_INTERFACE,
					     c->address);
		CONTINUE_IF_ADDRESS_V4COMPAT(IS_OSPF6_DEBUG_INTERFACE,
					     c->address);
		CONTINUE_IF_ADDRESS_V4MAPPED(IS_OSPF6_DEBUG_INTERFACE,
					     c->address);

		/* apply filter */
		if (oi->plist_name) {
			struct prefix_list *plist;
			enum prefix_list_type ret;
			char buf[PREFIX2STR_BUFFER];

			prefix2str(c->address, buf, sizeof(buf));
			plist = prefix_list_lookup(AFI_IP6, oi->plist_name);
			ret = prefix_list_apply(plist, (void *)c->address);
			if (ret == PREFIX_DENY) {
				if (IS_OSPF6_DEBUG_INTERFACE)
					zlog_debug(
						"%s on %s filtered by prefix-list %s ",
						buf, oi->interface->name,
						oi->plist_name);
				continue;
			}
		}

		route = ospf6_route_create();
		memcpy(&route->prefix, c->address, sizeof(struct prefix));
		apply_mask(&route->prefix);
		route->type = OSPF6_DEST_TYPE_NETWORK;
		route->path.area_id = oi->area->area_id;
		route->path.type = OSPF6_PATH_TYPE_INTRA;
		route->path.cost = oi->cost;
		inet_pton(AF_INET6, "::1", &nh_addr);
		ospf6_route_add_nexthop(route, oi->interface->ifindex,
					&nh_addr);
		ospf6_route_add(route, oi->route_connected);
	}

	/* create new Link-LSA */
	OSPF6_LINK_LSA_SCHEDULE(oi);
	OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
	OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
}

static void ospf6_interface_state_change(uint8_t next_state,
					 struct ospf6_interface *oi)
{
	uint8_t prev_state;

	prev_state = oi->state;
	oi->state = next_state;

	if (prev_state == next_state)
		return;

	/* log */
	if (IS_OSPF6_DEBUG_INTERFACE) {
		zlog_debug("Interface state change %s: %s -> %s",
			   oi->interface->name,
			   ospf6_interface_state_str[prev_state],
			   ospf6_interface_state_str[next_state]);
	}
	oi->state_change++;

	if ((prev_state == OSPF6_INTERFACE_DR
	     || prev_state == OSPF6_INTERFACE_BDR)
	    && (next_state != OSPF6_INTERFACE_DR
		&& next_state != OSPF6_INTERFACE_BDR))
		ospf6_sso(oi->interface->ifindex, &alldrouters6,
			  IPV6_LEAVE_GROUP);

	if ((prev_state != OSPF6_INTERFACE_DR
	     && prev_state != OSPF6_INTERFACE_BDR)
	    && (next_state == OSPF6_INTERFACE_DR
		|| next_state == OSPF6_INTERFACE_BDR))
		ospf6_sso(oi->interface->ifindex, &alldrouters6,
			  IPV6_JOIN_GROUP);

	OSPF6_ROUTER_LSA_SCHEDULE(oi->area);
	if (next_state == OSPF6_INTERFACE_DOWN) {
		OSPF6_NETWORK_LSA_EXECUTE(oi);
		OSPF6_INTRA_PREFIX_LSA_EXECUTE_TRANSIT(oi);
		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
		OSPF6_INTRA_PREFIX_LSA_EXECUTE_TRANSIT(oi);
	} else if (prev_state == OSPF6_INTERFACE_DR
		   || next_state == OSPF6_INTERFACE_DR) {
		OSPF6_NETWORK_LSA_SCHEDULE(oi);
		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
	}

	hook_call(ospf6_interface_change, oi, next_state, prev_state);
}


/* DR Election, RFC2328 section 9.4 */

#define IS_ELIGIBLE(n)                                                         \
	((n)->state >= OSPF6_NEIGHBOR_TWOWAY && (n)->priority != 0)

static struct ospf6_neighbor *better_bdrouter(struct ospf6_neighbor *a,
					      struct ospf6_neighbor *b)
{
	if ((a == NULL || !IS_ELIGIBLE(a) || a->drouter == a->router_id)
	    && (b == NULL || !IS_ELIGIBLE(b) || b->drouter == b->router_id))
		return NULL;
	else if (a == NULL || !IS_ELIGIBLE(a) || a->drouter == a->router_id)
		return b;
	else if (b == NULL || !IS_ELIGIBLE(b) || b->drouter == b->router_id)
		return a;

	if (a->bdrouter == a->router_id && b->bdrouter != b->router_id)
		return a;
	if (a->bdrouter != a->router_id && b->bdrouter == b->router_id)
		return b;

	if (a->priority > b->priority)
		return a;
	if (a->priority < b->priority)
		return b;

	if (ntohl(a->router_id) > ntohl(b->router_id))
		return a;
	if (ntohl(a->router_id) < ntohl(b->router_id))
		return b;

	zlog_warn("Router-ID duplicate ?");
	return a;
}

static struct ospf6_neighbor *better_drouter(struct ospf6_neighbor *a,
					     struct ospf6_neighbor *b)
{
	if ((a == NULL || !IS_ELIGIBLE(a) || a->drouter != a->router_id)
	    && (b == NULL || !IS_ELIGIBLE(b) || b->drouter != b->router_id))
		return NULL;
	else if (a == NULL || !IS_ELIGIBLE(a) || a->drouter != a->router_id)
		return b;
	else if (b == NULL || !IS_ELIGIBLE(b) || b->drouter != b->router_id)
		return a;

	if (a->drouter == a->router_id && b->drouter != b->router_id)
		return a;
	if (a->drouter != a->router_id && b->drouter == b->router_id)
		return b;

	if (a->priority > b->priority)
		return a;
	if (a->priority < b->priority)
		return b;

	if (ntohl(a->router_id) > ntohl(b->router_id))
		return a;
	if (ntohl(a->router_id) < ntohl(b->router_id))
		return b;

	zlog_warn("Router-ID duplicate ?");
	return a;
}

static uint8_t dr_election(struct ospf6_interface *oi)
{
	struct listnode *node, *nnode;
	struct ospf6_neighbor *on, *drouter, *bdrouter, myself;
	struct ospf6_neighbor *best_drouter, *best_bdrouter;
	uint8_t next_state = 0;

	drouter = bdrouter = NULL;
	best_drouter = best_bdrouter = NULL;

	/* pseudo neighbor myself, including noting current DR/BDR (1) */
	memset(&myself, 0, sizeof(myself));
	inet_ntop(AF_INET, &oi->area->ospf6->router_id, myself.name,
		  sizeof(myself.name));
	myself.state = OSPF6_NEIGHBOR_TWOWAY;
	myself.drouter = oi->drouter;
	myself.bdrouter = oi->bdrouter;
	myself.priority = oi->priority;
	myself.router_id = oi->area->ospf6->router_id;

	/* Electing BDR (2) */
	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
		bdrouter = better_bdrouter(bdrouter, on);

	best_bdrouter = bdrouter;
	bdrouter = better_bdrouter(best_bdrouter, &myself);

	/* Electing DR (3) */
	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
		drouter = better_drouter(drouter, on);

	best_drouter = drouter;
	drouter = better_drouter(best_drouter, &myself);
	if (drouter == NULL)
		drouter = bdrouter;

	/* the router itself is newly/no longer DR/BDR (4) */
	if ((drouter == &myself && myself.drouter != myself.router_id)
	    || (drouter != &myself && myself.drouter == myself.router_id)
	    || (bdrouter == &myself && myself.bdrouter != myself.router_id)
	    || (bdrouter != &myself && myself.bdrouter == myself.router_id)) {
		myself.drouter = (drouter ? drouter->router_id : htonl(0));
		myself.bdrouter = (bdrouter ? bdrouter->router_id : htonl(0));

		/* compatible to Electing BDR (2) */
		bdrouter = better_bdrouter(best_bdrouter, &myself);

		/* compatible to Electing DR (3) */
		drouter = better_drouter(best_drouter, &myself);
		if (drouter == NULL)
			drouter = bdrouter;
	}

	/* Set interface state accordingly (5) */
	if (drouter && drouter == &myself)
		next_state = OSPF6_INTERFACE_DR;
	else if (bdrouter && bdrouter == &myself)
		next_state = OSPF6_INTERFACE_BDR;
	else
		next_state = OSPF6_INTERFACE_DROTHER;

	/* If NBMA, schedule Start for each neighbor having priority of 0 (6) */
	/* XXX */

	/* If DR or BDR change, invoke AdjOK? for each neighbor (7) */
	/* RFC 2328 section 12.4. Originating LSAs (3) will be handled
	   accordingly after AdjOK */
	if (oi->drouter != (drouter ? drouter->router_id : htonl(0))
	    || oi->bdrouter != (bdrouter ? bdrouter->router_id : htonl(0))) {
		if (IS_OSPF6_DEBUG_INTERFACE)
			zlog_debug("DR Election on %s: DR: %s BDR: %s",
				   oi->interface->name,
				   (drouter ? drouter->name : "0.0.0.0"),
				   (bdrouter ? bdrouter->name : "0.0.0.0"));

		for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
			if (on->state < OSPF6_NEIGHBOR_TWOWAY)
				continue;
			/* Schedule AdjOK. */
			thread_add_event(master, adj_ok, on, 0, NULL);
		}
	}

	oi->drouter = (drouter ? drouter->router_id : htonl(0));
	oi->bdrouter = (bdrouter ? bdrouter->router_id : htonl(0));
	return next_state;
}


/* Interface State Machine */
int interface_up(struct thread *thread)
{
	struct ospf6_interface *oi;

	oi = (struct ospf6_interface *)THREAD_ARG(thread);
	assert(oi && oi->interface);

	if (!oi->type_cfg)
		oi->type = ospf6_default_iftype(oi->interface);

	/*
	 * Remove old pointer. If this thread wasn't a timer this
	 * operation won't make a difference, because it is already NULL.
	 */
	oi->thread_sso = NULL;

	if (IS_OSPF6_DEBUG_INTERFACE)
		zlog_debug("Interface Event %s: [InterfaceUp]",
			   oi->interface->name);

	/* check physical interface is up */
	if (!if_is_operative(oi->interface)) {
		if (IS_OSPF6_DEBUG_INTERFACE)
			zlog_debug(
				"Interface %s is down, can't execute [InterfaceUp]",
				oi->interface->name);
		return 0;
	}

	/* check interface has a link-local address */
	if (!(ospf6_interface_get_linklocal_address(oi->interface)
	      || if_is_loopback(oi->interface))) {
		if (IS_OSPF6_DEBUG_INTERFACE)
			zlog_debug(
				"Interface %s has no link local address, can't execute [InterfaceUp]",
				oi->interface->name);
		return 0;
	}

	/* Recompute cost */
	ospf6_interface_recalculate_cost(oi);

	/* if already enabled, do nothing */
	if (oi->state > OSPF6_INTERFACE_DOWN) {
		if (IS_OSPF6_DEBUG_INTERFACE)
			zlog_debug("Interface %s already enabled",
				   oi->interface->name);
		return 0;
	}

	/* If no area assigned, return */
	if (oi->area == NULL) {
		zlog_debug(
			"%s: Not scheduleing Hello for %s as there is no area assigned yet",
			__func__, oi->interface->name);
		return 0;
	}

#ifdef __FreeBSD__
	/*
	 * XXX: Schedule IPv6 group join for later, otherwise we might
	 * lose the multicast group registration caused by IPv6 group
	 * leave race.
	 */
	if (oi->sso_try_cnt == 0) {
		oi->sso_try_cnt++;
		zlog_info("Scheduling %s for sso", oi->interface->name);
		thread_add_timer(master, interface_up, oi,
				 OSPF6_INTERFACE_SSO_RETRY_INT,
				 &oi->thread_sso);
		return 0;
	}
#endif /* __FreeBSD__ */

	/* Join AllSPFRouters */
	if (ospf6_sso(oi->interface->ifindex, &allspfrouters6, IPV6_JOIN_GROUP)
	    < 0) {
		if (oi->sso_try_cnt++ < OSPF6_INTERFACE_SSO_RETRY_MAX) {
			zlog_info(
				"Scheduling %s for sso retry, trial count: %d",
				oi->interface->name, oi->sso_try_cnt);
			thread_add_timer(master, interface_up, oi,
					 OSPF6_INTERFACE_SSO_RETRY_INT,
					 &oi->thread_sso);
		}
		return 0;
	}
	oi->sso_try_cnt = 0; /* Reset on success */

	/* Update interface route */
	ospf6_interface_connected_route_update(oi->interface);

	/* Schedule Hello */
	if (!CHECK_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE)
	    && !if_is_loopback(oi->interface)) {
		oi->thread_send_hello = NULL;
		thread_add_event(master, ospf6_hello_send, oi, 0,
				 &oi->thread_send_hello);
	}

	/* decide next interface state */
	if (oi->type == OSPF_IFTYPE_POINTOPOINT) {
		ospf6_interface_state_change(OSPF6_INTERFACE_POINTTOPOINT, oi);
	} else if (oi->priority == 0)
		ospf6_interface_state_change(OSPF6_INTERFACE_DROTHER, oi);
	else {
		ospf6_interface_state_change(OSPF6_INTERFACE_WAITING, oi);
		thread_add_timer(master, wait_timer, oi, oi->dead_interval,
				 NULL);
	}

	return 0;
}

int wait_timer(struct thread *thread)
{
	struct ospf6_interface *oi;

	oi = (struct ospf6_interface *)THREAD_ARG(thread);
	assert(oi && oi->interface);

	if (IS_OSPF6_DEBUG_INTERFACE)
		zlog_debug("Interface Event %s: [WaitTimer]",
			   oi->interface->name);

	if (oi->state == OSPF6_INTERFACE_WAITING)
		ospf6_interface_state_change(dr_election(oi), oi);

	return 0;
}

int backup_seen(struct thread *thread)
{
	struct ospf6_interface *oi;

	oi = (struct ospf6_interface *)THREAD_ARG(thread);
	assert(oi && oi->interface);

	if (IS_OSPF6_DEBUG_INTERFACE)
		zlog_debug("Interface Event %s: [BackupSeen]",
			   oi->interface->name);

	if (oi->state == OSPF6_INTERFACE_WAITING)
		ospf6_interface_state_change(dr_election(oi), oi);

	return 0;
}

int neighbor_change(struct thread *thread)
{
	struct ospf6_interface *oi;

	oi = (struct ospf6_interface *)THREAD_ARG(thread);
	assert(oi && oi->interface);

	if (IS_OSPF6_DEBUG_INTERFACE)
		zlog_debug("Interface Event %s: [NeighborChange]",
			   oi->interface->name);

	if (oi->state == OSPF6_INTERFACE_DROTHER
	    || oi->state == OSPF6_INTERFACE_BDR
	    || oi->state == OSPF6_INTERFACE_DR)
		ospf6_interface_state_change(dr_election(oi), oi);

	return 0;
}

int interface_down(struct thread *thread)
{
	struct ospf6_interface *oi;
	struct listnode *node, *nnode;
	struct ospf6_neighbor *on;

	oi = (struct ospf6_interface *)THREAD_ARG(thread);
	assert(oi && oi->interface);

	if (IS_OSPF6_DEBUG_INTERFACE)
		zlog_debug("Interface Event %s: [InterfaceDown]",
			   oi->interface->name);

	/* Stop Hellos */
	THREAD_OFF(oi->thread_send_hello);

	/* Stop trying to set socket options. */
	THREAD_OFF(oi->thread_sso);

	/* Leave AllSPFRouters */
	if (oi->state > OSPF6_INTERFACE_DOWN)
		ospf6_sso(oi->interface->ifindex, &allspfrouters6,
			  IPV6_LEAVE_GROUP);

	ospf6_interface_state_change(OSPF6_INTERFACE_DOWN, oi);

	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
		ospf6_neighbor_delete(on);

	list_delete_all_node(oi->neighbor_list);

	/* When interface state is reset, also reset information about
	 * DR election, as it is no longer valid. */
	oi->drouter = oi->prev_drouter = htonl(0);
	oi->bdrouter = oi->prev_bdrouter = htonl(0);
	return 0;
}


static const char *ospf6_iftype_str(uint8_t iftype)
{
	switch (iftype) {
	case OSPF_IFTYPE_LOOPBACK:
		return "LOOPBACK";
	case OSPF_IFTYPE_BROADCAST:
		return "BROADCAST";
	case OSPF_IFTYPE_POINTOPOINT:
		return "POINTOPOINT";
	}
	return "UNKNOWN";
}

/* show specified interface structure */
static int ospf6_interface_show(struct vty *vty, struct interface *ifp)
{
	struct ospf6_interface *oi;
	struct connected *c;
	struct prefix *p;
	struct listnode *i;
	char strbuf[PREFIX2STR_BUFFER], drouter[32], bdrouter[32];
	uint8_t default_iftype;
	struct timeval res, now;
	char duration[32];
	struct ospf6_lsa *lsa, *lsanext;

	default_iftype = ospf6_default_iftype(ifp);

	vty_out(vty, "%s is %s, type %s\n", ifp->name,
		(if_is_operative(ifp) ? "up" : "down"),
		ospf6_iftype_str(default_iftype));
	vty_out(vty, "  Interface ID: %d\n", ifp->ifindex);

	if (ifp->info == NULL) {
		vty_out(vty, "   OSPF not enabled on this interface\n");
		return 0;
	} else
		oi = (struct ospf6_interface *)ifp->info;

	if (if_is_operative(ifp) && oi->type != default_iftype)
		vty_out(vty, "  Operating as type %s\n",
			ospf6_iftype_str(oi->type));

	vty_out(vty, "  Internet Address:\n");

	for (ALL_LIST_ELEMENTS_RO(ifp->connected, i, c)) {
		p = c->address;
		prefix2str(p, strbuf, sizeof(strbuf));
		switch (p->family) {
		case AF_INET:
			vty_out(vty, "    inet : %s\n", strbuf);
			break;
		case AF_INET6:
			vty_out(vty, "    inet6: %s\n", strbuf);
			break;
		default:
			vty_out(vty, "    ???  : %s\n", strbuf);
			break;
		}
	}

	if (oi->area) {
		vty_out(vty,
			"  Instance ID %d, Interface MTU %d (autodetect: %d)\n",
			oi->instance_id, oi->ifmtu, ifp->mtu6);
		vty_out(vty, "  MTU mismatch detection: %s\n",
			oi->mtu_ignore ? "disabled" : "enabled");
		inet_ntop(AF_INET, &oi->area->area_id, strbuf, sizeof(strbuf));
		vty_out(vty, "  Area ID %s, Cost %u\n", strbuf, oi->cost);
	} else
		vty_out(vty, "  Not Attached to Area\n");

	vty_out(vty, "  State %s, Transmit Delay %d sec, Priority %d\n",
		ospf6_interface_state_str[oi->state], oi->transdelay,
		oi->priority);
	vty_out(vty, "  Timer intervals configured:\n");
	vty_out(vty, "   Hello %d, Dead %d, Retransmit %d\n",
		oi->hello_interval, oi->dead_interval, oi->rxmt_interval);

	inet_ntop(AF_INET, &oi->drouter, drouter, sizeof(drouter));
	inet_ntop(AF_INET, &oi->bdrouter, bdrouter, sizeof(bdrouter));
	vty_out(vty, "  DR: %s BDR: %s\n", drouter, bdrouter);

	vty_out(vty, "  Number of I/F scoped LSAs is %u\n", oi->lsdb->count);

	monotime(&now);

	timerclear(&res);
	if (oi->thread_send_lsupdate)
		timersub(&oi->thread_send_lsupdate->u.sands, &now, &res);
	timerstring(&res, duration, sizeof(duration));
	vty_out(vty,
		"    %d Pending LSAs for LSUpdate in Time %s [thread %s]\n",
		oi->lsupdate_list->count, duration,
		(oi->thread_send_lsupdate ? "on" : "off"));
	for (ALL_LSDB(oi->lsupdate_list, lsa, lsanext))
		vty_out(vty, "      %s\n", lsa->name);

	timerclear(&res);
	if (oi->thread_send_lsack)
		timersub(&oi->thread_send_lsack->u.sands, &now, &res);
	timerstring(&res, duration, sizeof(duration));
	vty_out(vty, "    %d Pending LSAs for LSAck in Time %s [thread %s]\n",
		oi->lsack_list->count, duration,
		(oi->thread_send_lsack ? "on" : "off"));
	for (ALL_LSDB(oi->lsack_list, lsa, lsanext))
		vty_out(vty, "      %s\n", lsa->name);
	ospf6_bfd_show_info(vty, oi->bfd_info, 1);
	return 0;
}

/* show interface */
DEFUN (show_ipv6_ospf6_interface,
       show_ipv6_ospf6_interface_ifname_cmd,
       "show ipv6 ospf6 interface [IFNAME]",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       INTERFACE_STR
       IFNAME_STR)
{
	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
	int idx_ifname = 4;
	struct interface *ifp;

	if (argc == 5) {
		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_WARNING;
		}
		ospf6_interface_show(vty, ifp);
	} else {
		FOR_ALL_INTERFACES (vrf, ifp)
			ospf6_interface_show(vty, ifp);
	}

	return CMD_SUCCESS;
}

static int ospf6_interface_show_traffic(struct vty *vty,
					struct interface *intf_ifp,
					int display_once)
{
	struct interface *ifp;
	struct vrf *vrf = NULL;
	struct ospf6_interface *oi = NULL;

	if (intf_ifp)
		vrf = vrf_lookup_by_id(intf_ifp->vrf_id);
	else
		vrf = vrf_lookup_by_id(VRF_DEFAULT);

	if (!display_once) {
		vty_out(vty, "\n");
		vty_out(vty, "%-12s%-17s%-17s%-17s%-17s%-17s\n", "Interface",
			"    HELLO", "    DB-Desc", "   LS-Req", "   LS-Update",
			"   LS-Ack");
		vty_out(vty, "%-10s%-18s%-18s%-17s%-17s%-17s\n", "",
			"      Rx/Tx", "     Rx/Tx", "    Rx/Tx", "    Rx/Tx",
			"    Rx/Tx");
		vty_out(vty,
			"--------------------------------------------------------------------------------------------\n");
	}

	if (intf_ifp == NULL) {
		FOR_ALL_INTERFACES (vrf, ifp) {
			if (ifp->info)
				oi = (struct ospf6_interface *)ifp->info;
			else
				continue;

			vty_out(vty,
				"%-10s %8u/%-8u %7u/%-7u %7u/%-7u %7u/%-7u %7u/%-7u\n",
				oi->interface->name, oi->hello_in,
				oi->hello_out, oi->db_desc_in, oi->db_desc_out,
				oi->ls_req_in, oi->ls_req_out, oi->ls_upd_in,
				oi->ls_upd_out, oi->ls_ack_in, oi->ls_ack_out);
		}
	} else {
		oi = intf_ifp->info;
		if (oi == NULL)
			return CMD_WARNING;

		vty_out(vty,
			"%-10s %8u/%-8u %7u/%-7u %7u/%-7u %7u/%-7u %7u/%-7u\n",
			oi->interface->name, oi->hello_in, oi->hello_out,
			oi->db_desc_in, oi->db_desc_out, oi->ls_req_in,
			oi->ls_req_out, oi->ls_upd_in, oi->ls_upd_out,
			oi->ls_ack_in, oi->ls_ack_out);
	}

	return CMD_SUCCESS;
}

/* show interface */
DEFUN (show_ipv6_ospf6_interface_traffic,
       show_ipv6_ospf6_interface_traffic_cmd,
       "show ipv6 ospf6 interface traffic [IFNAME]",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       INTERFACE_STR
       "Protocol Packet counters\n"
       IFNAME_STR)
{
	int idx_ifname = 0;
	int display_once = 0;
	char *intf_name = NULL;
	struct interface *ifp = NULL;

	if (argv_find(argv, argc, "IFNAME", &idx_ifname)) {
		intf_name = argv[idx_ifname]->arg;
		ifp = if_lookup_by_name(intf_name, VRF_DEFAULT);
		if (ifp == NULL) {
			vty_out(vty, "No such Interface: %s\n", intf_name);
			return CMD_WARNING;
		}
		if (ifp->info == NULL) {
			vty_out(vty,
				"   OSPF not enabled on this interface %s\n",
				intf_name);
			return 0;
		}
	}

	ospf6_interface_show_traffic(vty, ifp, display_once);


	return CMD_SUCCESS;
}


DEFUN (show_ipv6_ospf6_interface_ifname_prefix,
       show_ipv6_ospf6_interface_ifname_prefix_cmd,
       "show ipv6 ospf6 interface IFNAME prefix\
          [<\
	    detail\
	    |<X:X::X:X|X:X::X:X/M> [<match|detail>]\
	  >]",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       INTERFACE_STR
       IFNAME_STR
       "Display connected prefixes to advertise\n"
       "Display details of the prefixes\n"
       OSPF6_ROUTE_ADDRESS_STR
       OSPF6_ROUTE_PREFIX_STR
       OSPF6_ROUTE_MATCH_STR
       "Display details of the prefixes\n")
{
	int idx_ifname = 4;
	int idx_prefix = 6;
	struct interface *ifp;
	struct ospf6_interface *oi;

	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_WARNING;
	}

	oi = ifp->info;
	if (oi == NULL) {
		vty_out(vty, "OSPFv3 is not enabled on %s\n",
			argv[idx_ifname]->arg);
		return CMD_WARNING;
	}

	ospf6_route_table_show(vty, idx_prefix, argc, argv,
			       oi->route_connected);

	return CMD_SUCCESS;
}

DEFUN (show_ipv6_ospf6_interface_prefix,
       show_ipv6_ospf6_interface_prefix_cmd,
       "show ipv6 ospf6 interface prefix\
          [<\
	    detail\
	    |<X:X::X:X|X:X::X:X/M> [<match|detail>]\
	  >]",
       SHOW_STR
       IP6_STR
       OSPF6_STR
       INTERFACE_STR
       "Display connected prefixes to advertise\n"
       "Display details of the prefixes\n"
       OSPF6_ROUTE_ADDRESS_STR
       OSPF6_ROUTE_PREFIX_STR
       OSPF6_ROUTE_MATCH_STR
       "Display details of the prefixes\n")
{
	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
	int idx_prefix = 5;
	struct ospf6_interface *oi;
	struct interface *ifp;

	FOR_ALL_INTERFACES (vrf, ifp) {
		oi = (struct ospf6_interface *)ifp->info;
		if (oi == NULL)
			continue;

		ospf6_route_table_show(vty, idx_prefix, argc, argv,
				       oi->route_connected);
	}

	return CMD_SUCCESS;
}

/* interface variable set command */
DEFUN (ipv6_ospf6_ifmtu,
       ipv6_ospf6_ifmtu_cmd,
       "ipv6 ospf6 ifmtu (1-65535)",
       IP6_STR
       OSPF6_STR
       "Interface MTU\n"
       "OSPFv3 Interface MTU\n"
       )
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	struct ospf6_interface *oi;
	unsigned int ifmtu, iobuflen;
	struct listnode *node, *nnode;
	struct ospf6_neighbor *on;

	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	ifmtu = strtol(argv[idx_number]->arg, NULL, 10);

	if (oi->c_ifmtu == ifmtu)
		return CMD_SUCCESS;

	if (ifp->mtu6 != 0 && ifp->mtu6 < ifmtu) {
		vty_out(vty,
			"%s's ospf6 ifmtu cannot go beyond physical mtu (%d)\n",
			ifp->name, ifp->mtu6);
		return CMD_WARNING_CONFIG_FAILED;
	}

	if (oi->ifmtu < ifmtu) {
		iobuflen = ospf6_iobuf_size(ifmtu);
		if (iobuflen < ifmtu) {
			vty_out(vty,
				"%s's ifmtu is adjusted to I/O buffer size (%d).\n",
				ifp->name, iobuflen);
			oi->ifmtu = oi->c_ifmtu = iobuflen;
		} else
			oi->ifmtu = oi->c_ifmtu = ifmtu;
	} else
		oi->ifmtu = oi->c_ifmtu = ifmtu;

	/* re-establish adjacencies */
	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
		THREAD_OFF(on->inactivity_timer);
		thread_add_event(master, inactivity_timer, on, 0, NULL);
	}

	return CMD_SUCCESS;
}

DEFUN (no_ipv6_ospf6_ifmtu,
       no_ipv6_ospf6_ifmtu_cmd,
       "no ipv6 ospf6 ifmtu [(1-65535)]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Interface MTU\n"
       "OSPFv3 Interface MTU\n"
       )
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf6_interface *oi;
	unsigned int iobuflen;
	struct listnode *node, *nnode;
	struct ospf6_neighbor *on;

	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	if (oi->ifmtu < ifp->mtu) {
		iobuflen = ospf6_iobuf_size(ifp->mtu);
		if (iobuflen < ifp->mtu) {
			vty_out(vty,
				"%s's ifmtu is adjusted to I/O buffer size (%d).\n",
				ifp->name, iobuflen);
			oi->ifmtu = iobuflen;
		} else
			oi->ifmtu = ifp->mtu;
	} else
		oi->ifmtu = ifp->mtu;

	oi->c_ifmtu = 0;

	/* re-establish adjacencies */
	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
		THREAD_OFF(on->inactivity_timer);
		thread_add_event(master, inactivity_timer, on, 0, NULL);
	}

	return CMD_SUCCESS;
}

DEFUN (ipv6_ospf6_cost,
       ipv6_ospf6_cost_cmd,
       "ipv6 ospf6 cost (1-65535)",
       IP6_STR
       OSPF6_STR
       "Interface cost\n"
       "Outgoing metric of this interface\n")
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	struct ospf6_interface *oi;
	unsigned long int lcost;

	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	lcost = strtol(argv[idx_number]->arg, NULL, 10);

	if (lcost > UINT32_MAX) {
		vty_out(vty, "Cost %ld is out of range\n", lcost);
		return CMD_WARNING_CONFIG_FAILED;
	}

	if (oi->cost == lcost)
		return CMD_SUCCESS;

	oi->cost = lcost;
	SET_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST);

	ospf6_interface_force_recalculate_cost(oi);

	return CMD_SUCCESS;
}

DEFUN (no_ipv6_ospf6_cost,
       no_ipv6_ospf6_cost_cmd,
       "no ipv6 ospf6 cost [(1-65535)]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Calculate interface cost from bandwidth\n"
       "Outgoing metric of this interface\n")
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	UNSET_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST);

	ospf6_interface_recalculate_cost(oi);

	return CMD_SUCCESS;
}

DEFUN (auto_cost_reference_bandwidth,
       auto_cost_reference_bandwidth_cmd,
       "auto-cost reference-bandwidth (1-4294967)",
       "Calculate OSPF interface cost according to bandwidth\n"
       "Use reference bandwidth method to assign OSPF cost\n"
       "The reference bandwidth in terms of Mbits per second\n")
{
	VTY_DECLVAR_CONTEXT(ospf6, o);
	int idx_number = 2;
	struct ospf6_area *oa;
	struct ospf6_interface *oi;
	struct listnode *i, *j;
	uint32_t refbw;

	refbw = strtol(argv[idx_number]->arg, NULL, 10);
	if (refbw < 1 || refbw > 4294967) {
		vty_out(vty, "reference-bandwidth value is invalid\n");
		return CMD_WARNING_CONFIG_FAILED;
	}

	/* If reference bandwidth is changed. */
	if ((refbw) == o->ref_bandwidth)
		return CMD_SUCCESS;

	o->ref_bandwidth = refbw;
	for (ALL_LIST_ELEMENTS_RO(o->area_list, i, oa))
		for (ALL_LIST_ELEMENTS_RO(oa->if_list, j, oi))
			ospf6_interface_recalculate_cost(oi);

	return CMD_SUCCESS;
}

DEFUN (no_auto_cost_reference_bandwidth,
       no_auto_cost_reference_bandwidth_cmd,
       "no auto-cost reference-bandwidth [(1-4294967)]",
       NO_STR
       "Calculate OSPF interface cost according to bandwidth\n"
       "Use reference bandwidth method to assign OSPF cost\n"
       "The reference bandwidth in terms of Mbits per second\n")
{
	VTY_DECLVAR_CONTEXT(ospf6, o);
	struct ospf6_area *oa;
	struct ospf6_interface *oi;
	struct listnode *i, *j;

	if (o->ref_bandwidth == OSPF6_REFERENCE_BANDWIDTH)
		return CMD_SUCCESS;

	o->ref_bandwidth = OSPF6_REFERENCE_BANDWIDTH;
	for (ALL_LIST_ELEMENTS_RO(o->area_list, i, oa))
		for (ALL_LIST_ELEMENTS_RO(oa->if_list, j, oi))
			ospf6_interface_recalculate_cost(oi);

	return CMD_SUCCESS;
}


DEFUN (ipv6_ospf6_hellointerval,
       ipv6_ospf6_hellointerval_cmd,
       "ipv6 ospf6 hello-interval (1-65535)",
       IP6_STR
       OSPF6_STR
       "Time between HELLO packets\n"
       SECONDS_STR)
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	oi->hello_interval = strmatch(argv[0]->text, "no")
				     ? OSPF_HELLO_INTERVAL_DEFAULT
				     : strtoul(argv[idx_number]->arg, NULL, 10);
	return CMD_SUCCESS;
}

ALIAS (ipv6_ospf6_hellointerval,
       no_ipv6_ospf6_hellointerval_cmd,
       "no ipv6 ospf6 hello-interval [(1-65535)]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Time between HELLO packets\n"
       SECONDS_STR)

/* interface variable set command */
DEFUN (ipv6_ospf6_deadinterval,
       ipv6_ospf6_deadinterval_cmd,
       "ipv6 ospf6 dead-interval (1-65535)",
       IP6_STR
       OSPF6_STR
       "Interval time after which a neighbor is declared down\n"
       SECONDS_STR)
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	oi->dead_interval = strmatch(argv[0]->arg, "no")
				    ? OSPF_ROUTER_DEAD_INTERVAL_DEFAULT
				    : strtoul(argv[idx_number]->arg, NULL, 10);
	return CMD_SUCCESS;
}

ALIAS (ipv6_ospf6_deadinterval,
       no_ipv6_ospf6_deadinterval_cmd,
       "no ipv6 ospf6 dead-interval [(1-65535)]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Interval time after which a neighbor is declared down\n"
       SECONDS_STR)

/* interface variable set command */
DEFUN (ipv6_ospf6_transmitdelay,
       ipv6_ospf6_transmitdelay_cmd,
       "ipv6 ospf6 transmit-delay (1-3600)",
       IP6_STR
       OSPF6_STR
       "Link state transmit delay\n"
       SECONDS_STR)
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	oi->transdelay = strmatch(argv[0]->text, "no")
				 ? OSPF6_INTERFACE_TRANSDELAY
				 : strtoul(argv[idx_number]->arg, NULL, 10);
	return CMD_SUCCESS;
}

ALIAS (ipv6_ospf6_transmitdelay,
       no_ipv6_ospf6_transmitdelay_cmd,
       "no ipv6 ospf6 transmit-delay [(1-3600)]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Link state transmit delay\n"
       SECONDS_STR)

/* interface variable set command */
DEFUN (ipv6_ospf6_retransmitinterval,
       ipv6_ospf6_retransmitinterval_cmd,
       "ipv6 ospf6 retransmit-interval (1-65535)",
       IP6_STR
       OSPF6_STR
       "Time between retransmitting lost link state advertisements\n"
       SECONDS_STR)
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	oi->rxmt_interval = strmatch(argv[0]->text, "no")
				    ? OSPF_RETRANSMIT_INTERVAL_DEFAULT
				    : strtoul(argv[idx_number]->arg, NULL, 10);
	return CMD_SUCCESS;
}

ALIAS (ipv6_ospf6_retransmitinterval,
       no_ipv6_ospf6_retransmitinterval_cmd,
       "no ipv6 ospf6 retransmit-interval [(1-65535)]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Time between retransmitting lost link state advertisements\n"
       SECONDS_STR)

/* interface variable set command */
DEFUN (ipv6_ospf6_priority,
       ipv6_ospf6_priority_cmd,
       "ipv6 ospf6 priority (0-255)",
       IP6_STR
       OSPF6_STR
       "Router priority\n"
       "Priority value\n")
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	oi->priority = strmatch(argv[0]->text, "no")
			       ? OSPF6_INTERFACE_PRIORITY
			       : strtoul(argv[idx_number]->arg, NULL, 10);

	if (oi->area && (oi->state == OSPF6_INTERFACE_DROTHER
			 || oi->state == OSPF6_INTERFACE_BDR
			 || oi->state == OSPF6_INTERFACE_DR))
		ospf6_interface_state_change(dr_election(oi), oi);

	return CMD_SUCCESS;
}

ALIAS (ipv6_ospf6_priority,
       no_ipv6_ospf6_priority_cmd,
       "no ipv6 ospf6 priority [(0-255)]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Router priority\n"
       "Priority value\n")

DEFUN (ipv6_ospf6_instance,
       ipv6_ospf6_instance_cmd,
       "ipv6 ospf6 instance-id (0-255)",
       IP6_STR
       OSPF6_STR
       "Instance ID for this interface\n"
       "Instance ID value\n")
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_number = 3;
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	oi->instance_id = strmatch(argv[0]->text, "no")
				  ? OSPF6_INTERFACE_INSTANCE_ID
				  : strtoul(argv[idx_number]->arg, NULL, 10);
	return CMD_SUCCESS;
}

ALIAS (ipv6_ospf6_instance,
       no_ipv6_ospf6_instance_cmd,
       "no ipv6 ospf6 instance-id [(0-255)]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Instance ID for this interface\n"
       "Instance ID value\n")

DEFUN (ipv6_ospf6_passive,
       ipv6_ospf6_passive_cmd,
       "ipv6 ospf6 passive",
       IP6_STR
       OSPF6_STR
       "Passive interface; no adjacency will be formed on this interface\n"
       )
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf6_interface *oi;
	struct listnode *node, *nnode;
	struct ospf6_neighbor *on;

	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	SET_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE);
	THREAD_OFF(oi->thread_send_hello);
	THREAD_OFF(oi->thread_sso);

	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
		THREAD_OFF(on->inactivity_timer);
		thread_add_event(master, inactivity_timer, on, 0, NULL);
	}

	return CMD_SUCCESS;
}

DEFUN (no_ipv6_ospf6_passive,
       no_ipv6_ospf6_passive_cmd,
       "no ipv6 ospf6 passive",
       NO_STR
       IP6_STR
       OSPF6_STR
       "passive interface: No Adjacency will be formed on this I/F\n"
       )
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	UNSET_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE);
	THREAD_OFF(oi->thread_send_hello);
	THREAD_OFF(oi->thread_sso);
	thread_add_event(master, ospf6_hello_send, oi, 0,
			 &oi->thread_send_hello);

	return CMD_SUCCESS;
}

DEFUN (ipv6_ospf6_mtu_ignore,
       ipv6_ospf6_mtu_ignore_cmd,
       "ipv6 ospf6 mtu-ignore",
       IP6_STR
       OSPF6_STR
       "Disable MTU mismatch detection on this interface\n"
       )
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	oi->mtu_ignore = 1;

	return CMD_SUCCESS;
}

DEFUN (no_ipv6_ospf6_mtu_ignore,
       no_ipv6_ospf6_mtu_ignore_cmd,
       "no ipv6 ospf6 mtu-ignore",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Disable MTU mismatch detection on this interface\n"
       )
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	oi->mtu_ignore = 0;

	return CMD_SUCCESS;
}

DEFUN (ipv6_ospf6_advertise_prefix_list,
       ipv6_ospf6_advertise_prefix_list_cmd,
       "ipv6 ospf6 advertise prefix-list WORD",
       IP6_STR
       OSPF6_STR
       "Advertising options\n"
       "Filter prefix using prefix-list\n"
       "Prefix list name\n"
       )
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_word = 4;
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	if (oi->plist_name)
		XFREE(MTYPE_CFG_PLIST_NAME, oi->plist_name);
	oi->plist_name = XSTRDUP(MTYPE_CFG_PLIST_NAME, argv[idx_word]->arg);

	ospf6_interface_connected_route_update(oi->interface);

	if (oi->area) {
		OSPF6_LINK_LSA_SCHEDULE(oi);
		if (oi->state == OSPF6_INTERFACE_DR) {
			OSPF6_NETWORK_LSA_SCHEDULE(oi);
			OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
		}
		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
	}

	return CMD_SUCCESS;
}

DEFUN (no_ipv6_ospf6_advertise_prefix_list,
       no_ipv6_ospf6_advertise_prefix_list_cmd,
       "no ipv6 ospf6 advertise prefix-list [WORD]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Advertising options\n"
       "Filter prefix using prefix-list\n"
       "Prefix list name\n")
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL)
		oi = ospf6_interface_create(ifp);
	assert(oi);

	if (oi->plist_name)
		XFREE(MTYPE_CFG_PLIST_NAME, oi->plist_name);

	ospf6_interface_connected_route_update(oi->interface);

	if (oi->area) {
		OSPF6_LINK_LSA_SCHEDULE(oi);
		if (oi->state == OSPF6_INTERFACE_DR) {
			OSPF6_NETWORK_LSA_SCHEDULE(oi);
			OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
		}
		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
	}

	return CMD_SUCCESS;
}

DEFUN (ipv6_ospf6_network,
       ipv6_ospf6_network_cmd,
       "ipv6 ospf6 network <broadcast|point-to-point>",
       IP6_STR
       OSPF6_STR
       "Network type\n"
       "Specify OSPF6 broadcast network\n"
       "Specify OSPF6 point-to-point network\n"
       )
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	int idx_network = 3;
	struct ospf6_interface *oi;
	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL) {
		oi = ospf6_interface_create(ifp);
	}
	assert(oi);

	oi->type_cfg = true;

	if (strncmp(argv[idx_network]->arg, "b", 1) == 0) {
		if (oi->type == OSPF_IFTYPE_BROADCAST)
			return CMD_SUCCESS;

		oi->type = OSPF_IFTYPE_BROADCAST;
	} else if (strncmp(argv[idx_network]->arg, "point-to-p", 10) == 0) {
		if (oi->type == OSPF_IFTYPE_POINTOPOINT) {
			return CMD_SUCCESS;
		}
		oi->type = OSPF_IFTYPE_POINTOPOINT;
	}

	/* Reset the interface */
	thread_execute(master, interface_down, oi, 0);
	thread_execute(master, interface_up, oi, 0);

	return CMD_SUCCESS;
}

DEFUN (no_ipv6_ospf6_network,
       no_ipv6_ospf6_network_cmd,
       "no ipv6 ospf6 network [<broadcast|point-to-point>]",
       NO_STR
       IP6_STR
       OSPF6_STR
       "Set default network type\n"
       "Specify OSPF6 broadcast network\n"
       "Specify OSPF6 point-to-point network\n")
{
	VTY_DECLVAR_CONTEXT(interface, ifp);
	struct ospf6_interface *oi;
	int type;

	assert(ifp);

	oi = (struct ospf6_interface *)ifp->info;
	if (oi == NULL) {
		return CMD_SUCCESS;
	}

	oi->type_cfg = false;

	type = ospf6_default_iftype(ifp);
	if (oi->type == type) {
		return CMD_SUCCESS;
	}
	oi->type = type;

	/* Reset the interface */
	thread_execute(master, interface_down, oi, 0);
	thread_execute(master, interface_up, oi, 0);

	return CMD_SUCCESS;
}

static int config_write_ospf6_interface(struct vty *vty)
{
	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
	struct ospf6_interface *oi;
	struct interface *ifp;

	FOR_ALL_INTERFACES (vrf, ifp) {
		oi = (struct ospf6_interface *)ifp->info;
		if (oi == NULL)
			continue;

		vty_frame(vty, "interface %s\n", oi->interface->name);

		if (ifp->desc)
			vty_out(vty, " description %s\n", ifp->desc);
		if (oi->c_ifmtu)
			vty_out(vty, " ipv6 ospf6 ifmtu %d\n", oi->c_ifmtu);

		if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST))
			vty_out(vty, " ipv6 ospf6 cost %d\n", oi->cost);

		if (oi->hello_interval != OSPF6_INTERFACE_HELLO_INTERVAL)
			vty_out(vty, " ipv6 ospf6 hello-interval %d\n",
				oi->hello_interval);

		if (oi->dead_interval != OSPF6_INTERFACE_DEAD_INTERVAL)
			vty_out(vty, " ipv6 ospf6 dead-interval %d\n",
				oi->dead_interval);

		if (oi->rxmt_interval != OSPF6_INTERFACE_RXMT_INTERVAL)
			vty_out(vty, " ipv6 ospf6 retransmit-interval %d\n",
				oi->rxmt_interval);

		if (oi->priority != OSPF6_INTERFACE_PRIORITY)
			vty_out(vty, " ipv6 ospf6 priority %d\n", oi->priority);

		if (oi->transdelay != OSPF6_INTERFACE_TRANSDELAY)
			vty_out(vty, " ipv6 ospf6 transmit-delay %d\n",
				oi->transdelay);

		if (oi->instance_id != OSPF6_INTERFACE_INSTANCE_ID)
			vty_out(vty, " ipv6 ospf6 instance-id %d\n",
				oi->instance_id);

		if (oi->plist_name)
			vty_out(vty, " ipv6 ospf6 advertise prefix-list %s\n",
				oi->plist_name);

		if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE))
			vty_out(vty, " ipv6 ospf6 passive\n");

		if (oi->mtu_ignore)
			vty_out(vty, " ipv6 ospf6 mtu-ignore\n");

		if (oi->type_cfg && oi->type == OSPF_IFTYPE_POINTOPOINT)
			vty_out(vty, " ipv6 ospf6 network point-to-point\n");
		else if (oi->type_cfg && oi->type == OSPF_IFTYPE_BROADCAST)
			vty_out(vty, " ipv6 ospf6 network broadcast\n");

		ospf6_bfd_write_config(vty, oi);

		vty_endframe(vty, "!\n");
	}
	return 0;
}

static int config_write_ospf6_interface(struct vty *vty);
static struct cmd_node interface_node = {
	.name = "interface",
	.node = INTERFACE_NODE,
	.parent_node = CONFIG_NODE,
	.prompt = "%s(config-if)# ",
	.config_write = config_write_ospf6_interface,
};

static int ospf6_ifp_create(struct interface *ifp)
{
	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
		zlog_debug("Zebra Interface add: %s index %d mtu %d", ifp->name,
			   ifp->ifindex, ifp->mtu6);
	ospf6_interface_if_add(ifp);

	return 0;
}

static int ospf6_ifp_up(struct interface *ifp)
{
	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
		zlog_debug(
			"Zebra Interface state change: %s index %d flags %llx metric %d mtu %d bandwidth %d",
			ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
			ifp->metric, ifp->mtu6, ifp->bandwidth);

	ospf6_interface_state_update(ifp);

	return 0;
}

static int ospf6_ifp_down(struct interface *ifp)
{
	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
		zlog_debug(
			"Zebra Interface state change: %s index %d flags %llx metric %d mtu %d bandwidth %d",
			ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
			ifp->metric, ifp->mtu6, ifp->bandwidth);

	ospf6_interface_state_update(ifp);

	return 0;
}

static int ospf6_ifp_destroy(struct interface *ifp)
{
	if (if_is_up(ifp))
		zlog_warn("Zebra: got delete of %s, but interface is still up",
			  ifp->name);

	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
		zlog_debug("Zebra Interface delete: %s index %d mtu %d",
			   ifp->name, ifp->ifindex, ifp->mtu6);

	return 0;
}

void ospf6_interface_init(void)
{
	/* Install interface node. */
	install_node(&interface_node);
	if_cmd_init();
	if_zapi_callbacks(ospf6_ifp_create, ospf6_ifp_up,
			  ospf6_ifp_down, ospf6_ifp_destroy);

	install_element(VIEW_NODE, &show_ipv6_ospf6_interface_prefix_cmd);
	install_element(VIEW_NODE, &show_ipv6_ospf6_interface_ifname_cmd);
	install_element(VIEW_NODE,
			&show_ipv6_ospf6_interface_ifname_prefix_cmd);
	install_element(VIEW_NODE, &show_ipv6_ospf6_interface_traffic_cmd);

	install_element(INTERFACE_NODE, &ipv6_ospf6_cost_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_cost_cmd);
	install_element(INTERFACE_NODE, &ipv6_ospf6_ifmtu_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_ifmtu_cmd);

	install_element(INTERFACE_NODE, &ipv6_ospf6_deadinterval_cmd);
	install_element(INTERFACE_NODE, &ipv6_ospf6_hellointerval_cmd);
	install_element(INTERFACE_NODE, &ipv6_ospf6_priority_cmd);
	install_element(INTERFACE_NODE, &ipv6_ospf6_retransmitinterval_cmd);
	install_element(INTERFACE_NODE, &ipv6_ospf6_transmitdelay_cmd);
	install_element(INTERFACE_NODE, &ipv6_ospf6_instance_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_deadinterval_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_hellointerval_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_priority_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_retransmitinterval_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_transmitdelay_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_instance_cmd);

	install_element(INTERFACE_NODE, &ipv6_ospf6_passive_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_passive_cmd);

	install_element(INTERFACE_NODE, &ipv6_ospf6_mtu_ignore_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_mtu_ignore_cmd);

	install_element(INTERFACE_NODE, &ipv6_ospf6_advertise_prefix_list_cmd);
	install_element(INTERFACE_NODE,
			&no_ipv6_ospf6_advertise_prefix_list_cmd);

	install_element(INTERFACE_NODE, &ipv6_ospf6_network_cmd);
	install_element(INTERFACE_NODE, &no_ipv6_ospf6_network_cmd);

	/* reference bandwidth commands */
	install_element(OSPF6_NODE, &auto_cost_reference_bandwidth_cmd);
	install_element(OSPF6_NODE, &no_auto_cost_reference_bandwidth_cmd);
}

/* Clear the specified interface structure */
static void ospf6_interface_clear(struct vty *vty, struct interface *ifp)
{
	struct ospf6_interface *oi;

	if (!if_is_operative(ifp))
		return;

	if (ifp->info == NULL)
		return;

	oi = (struct ospf6_interface *)ifp->info;

	if (IS_OSPF6_DEBUG_INTERFACE)
		zlog_debug("Interface %s: clear by reset", ifp->name);

	/* Reset the interface */
	thread_execute(master, interface_down, oi, 0);
	thread_execute(master, interface_up, oi, 0);
}

/* Clear interface */
DEFUN (clear_ipv6_ospf6_interface,
       clear_ipv6_ospf6_interface_cmd,
       "clear ipv6 ospf6 interface [IFNAME]",
       CLEAR_STR
       IP6_STR
       OSPF6_STR
       INTERFACE_STR
       IFNAME_STR
       )
{
	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
	int idx_ifname = 4;
	struct interface *ifp;

	if (argc == 4) /* Clear all the ospfv3 interfaces. */
	{
		FOR_ALL_INTERFACES (vrf, ifp)
			ospf6_interface_clear(vty, ifp);
	} else /* Interface name is specified. */
	{
		if ((ifp = if_lookup_by_name(argv[idx_ifname]->arg,
					     VRF_DEFAULT))
		    == NULL) {
			vty_out(vty, "No such Interface: %s\n",
				argv[idx_ifname]->arg);
			return CMD_WARNING;
		}
		ospf6_interface_clear(vty, ifp);
	}

	return CMD_SUCCESS;
}

void install_element_ospf6_clear_interface(void)
{
	install_element(ENABLE_NODE, &clear_ipv6_ospf6_interface_cmd);
}

DEFUN (debug_ospf6_interface,
       debug_ospf6_interface_cmd,
       "debug ospf6 interface",
       DEBUG_STR
       OSPF6_STR
       "Debug OSPFv3 Interface\n"
      )
{
	OSPF6_DEBUG_INTERFACE_ON();
	return CMD_SUCCESS;
}

DEFUN (no_debug_ospf6_interface,
       no_debug_ospf6_interface_cmd,
       "no debug ospf6 interface",
       NO_STR
       DEBUG_STR
       OSPF6_STR
       "Debug OSPFv3 Interface\n"
      )
{
	OSPF6_DEBUG_INTERFACE_OFF();
	return CMD_SUCCESS;
}

int config_write_ospf6_debug_interface(struct vty *vty)
{
	if (IS_OSPF6_DEBUG_INTERFACE)
		vty_out(vty, "debug ospf6 interface\n");
	return 0;
}

void install_element_ospf6_debug_interface(void)
{
	install_element(ENABLE_NODE, &debug_ospf6_interface_cmd);
	install_element(ENABLE_NODE, &no_debug_ospf6_interface_cmd);
	install_element(CONFIG_NODE, &debug_ospf6_interface_cmd);
	install_element(CONFIG_NODE, &no_debug_ospf6_interface_cmd);
}