/*
 * EIGRP Filter Functions.
 * Copyright (C) 2013-2015
 * Authors:
 *   Donnie Savage
 *   Jan Janovic
 *   Matej Perina
 *   Peter Orsag
 *   Peter Paluch
 *   Frantisek Gazo
 *   Tomas Hvorkovy
 *   Martin Kontsek
 *   Lukas Koribsky
 *
 *
 * 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 "if.h"
#include "command.h"
#include "prefix.h"
#include "table.h"
#include "thread.h"
#include "memory.h"
#include "log.h"
#include "stream.h"
#include "filter.h"
#include "sockunion.h"
#include "sockopt.h"
#include "routemap.h"
#include "if_rmap.h"
#include "plist.h"
#include "distribute.h"
#include "md5.h"
#include "keychain.h"
#include "privs.h"
#include "vrf.h"

#include "eigrpd/eigrp_structs.h"
#include "eigrpd/eigrpd.h"
#include "eigrpd/eigrp_const.h"
#include "eigrpd/eigrp_filter.h"
#include "eigrpd/eigrp_packet.h"

/*
 * Distribute-list update functions.
 */
void eigrp_distribute_update(struct distribute_ctx *ctx,
			     struct distribute *dist)
{
	struct eigrp *e = eigrp_lookup(ctx->vrf->vrf_id);
	struct interface *ifp;
	struct eigrp_interface *ei = NULL;
	struct access_list *alist;
	struct prefix_list *plist;
	// struct route_map *routemap;

	/* if no interface address is present, set list to eigrp process struct
	 */

	/* Check if distribute-list was set for process or interface */
	if (!dist->ifname) {
		/* access list IN for whole process */
		if (dist->list[DISTRIBUTE_V4_IN]) {
			alist = access_list_lookup(
				AFI_IP, dist->list[DISTRIBUTE_V4_IN]);
			if (alist)
				e->list[EIGRP_FILTER_IN] = alist;
			else
				e->list[EIGRP_FILTER_IN] = NULL;
		} else {
			e->list[EIGRP_FILTER_IN] = NULL;
		}

		/* access list OUT for whole process */
		if (dist->list[DISTRIBUTE_V4_OUT]) {
			alist = access_list_lookup(
				AFI_IP, dist->list[DISTRIBUTE_V4_OUT]);
			if (alist)
				e->list[EIGRP_FILTER_OUT] = alist;
			else
				e->list[EIGRP_FILTER_OUT] = NULL;
		} else {
			e->list[EIGRP_FILTER_OUT] = NULL;
		}

		/* PREFIX_LIST IN for process */
		if (dist->prefix[DISTRIBUTE_V4_IN]) {
			plist = prefix_list_lookup(
				AFI_IP, dist->prefix[DISTRIBUTE_V4_IN]);
			if (plist) {
				e->prefix[EIGRP_FILTER_IN] = plist;
			} else
				e->prefix[EIGRP_FILTER_IN] = NULL;
		} else
			e->prefix[EIGRP_FILTER_IN] = NULL;

		/* PREFIX_LIST OUT for process */
		if (dist->prefix[DISTRIBUTE_V4_OUT]) {
			plist = prefix_list_lookup(
				AFI_IP, dist->prefix[DISTRIBUTE_V4_OUT]);
			if (plist) {
				e->prefix[EIGRP_FILTER_OUT] = plist;

			} else
				e->prefix[EIGRP_FILTER_OUT] = NULL;
		} else
			e->prefix[EIGRP_FILTER_OUT] = NULL;

		// TODO: check Graceful restart after 10sec

		/* cancel GR scheduled */
		thread_cancel(&(e->t_distribute));

		/* schedule Graceful restart for whole process in 10sec */
		thread_add_timer(master, eigrp_distribute_timer_process, e,
				 (10), &e->t_distribute);

		return;
	}

	ifp = if_lookup_by_name(dist->ifname, e->vrf_id);
	if (ifp == NULL)
		return;

	/*struct eigrp_if_info * info = ifp->info;
	ei = info->eigrp_interface;*/
	struct listnode *node, *nnode;
	struct eigrp_interface *ei2;
	/* Find proper interface */
	for (ALL_LIST_ELEMENTS(e->eiflist, node, nnode, ei2)) {
		if (strcmp(ei2->ifp->name, ifp->name) == 0) {
			ei = ei2;
			break;
		}
	}
	assert(ei != NULL);

	/* Access-list for interface in */
	if (dist->list[DISTRIBUTE_V4_IN]) {
		alist = access_list_lookup(AFI_IP,
					   dist->list[DISTRIBUTE_V4_IN]);
		if (alist) {
			ei->list[EIGRP_FILTER_IN] = alist;
		} else
			ei->list[EIGRP_FILTER_IN] = NULL;
	} else {
		ei->list[EIGRP_FILTER_IN] = NULL;
	}

	/* Access-list for interface in */
	if (dist->list[DISTRIBUTE_V4_OUT]) {
		alist = access_list_lookup(AFI_IP,
					   dist->list[DISTRIBUTE_V4_OUT]);
		if (alist)
			ei->list[EIGRP_FILTER_OUT] = alist;
		else
			ei->list[EIGRP_FILTER_OUT] = NULL;

	} else
		ei->list[EIGRP_FILTER_OUT] = NULL;

	/* Prefix-list for interface in */
	if (dist->prefix[DISTRIBUTE_V4_IN]) {
		plist = prefix_list_lookup(AFI_IP,
					   dist->prefix[DISTRIBUTE_V4_IN]);
		if (plist)
			ei->prefix[EIGRP_FILTER_IN] = plist;
		else
			ei->prefix[EIGRP_FILTER_IN] = NULL;
	} else
		ei->prefix[EIGRP_FILTER_IN] = NULL;

	/* Prefix-list for interface out */
	if (dist->prefix[DISTRIBUTE_V4_OUT]) {
		plist = prefix_list_lookup(AFI_IP,
					   dist->prefix[DISTRIBUTE_V4_OUT]);
		if (plist)
			ei->prefix[EIGRP_FILTER_OUT] = plist;
		else
			ei->prefix[EIGRP_FILTER_OUT] = NULL;
	} else
		ei->prefix[EIGRP_FILTER_OUT] = NULL;

	// TODO: check Graceful restart after 10sec

	/* Cancel GR scheduled */
	thread_cancel(&(ei->t_distribute));
	/* schedule Graceful restart for interface in 10sec */
	thread_add_timer(master, eigrp_distribute_timer_interface, ei, 10,
			 &ei->t_distribute);
}

/*
 * Function called by prefix-list and access-list update
 */
void eigrp_distribute_update_interface(struct interface *ifp)
{
	struct distribute *dist;
	struct eigrp *eigrp;

	eigrp = eigrp_lookup(ifp->vrf->vrf_id);
	if (!eigrp)
		return;
	dist = distribute_lookup(eigrp->distribute_ctx, ifp->name);
	if (dist)
		eigrp_distribute_update(eigrp->distribute_ctx,
					dist);
}

/* Update all interface's distribute list.
 * Function used in hook for prefix-list
 */
void eigrp_distribute_update_all(struct prefix_list *notused)
{
	struct vrf *vrf;
	struct interface *ifp;

	RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
		FOR_ALL_INTERFACES (vrf, ifp)
			eigrp_distribute_update_interface(ifp);
	}
}

/*
 * Function used in hook for acces-list
 */
void eigrp_distribute_update_all_wrapper(struct access_list *notused)
{
	eigrp_distribute_update_all(NULL);
}

/*
 * @fn eigrp_distribute_timer_process
 *
 * @param[in]   thread  current execution thread timer is associated with
 *
 * @return void
 *
 * @par
 * Called when 10sec waiting time expire and
 * executes Graceful restart for whole process
 */
void eigrp_distribute_timer_process(struct thread *thread)
{
	struct eigrp *eigrp;

	eigrp = THREAD_ARG(thread);

	/* execute GR for whole process */
	eigrp_update_send_process_GR(eigrp, EIGRP_GR_FILTER, NULL);
}

/*
 * @fn eigrp_distribute_timer_interface
 *
 * @param[in]   thread  current execution thread timer is associated with
 *
 * @return void
 *
 * @par
 * Called when 10sec waiting time expire and
 * executes Graceful restart for interface
 */
void eigrp_distribute_timer_interface(struct thread *thread)
{
	struct eigrp_interface *ei;

	ei = THREAD_ARG(thread);
	ei->t_distribute = NULL;

	/* execute GR for interface */
	eigrp_update_send_interface_GR(ei, EIGRP_GR_FILTER, NULL);
}