/* RIPng peer support
 * Copyright (C) 2000 Kunihiro Ishiguro <kunihiro@zebra.org>
 *
 * 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
 */

/* RIPng support added by Vincent Jardin <vincent.jardin@6wind.com>
 * Copyright (C) 2002 6WIND
 */

#include <zebra.h>

#include "if.h"
#include "prefix.h"
#include "command.h"
#include "linklist.h"
#include "thread.h"
#include "memory.h"

#include "ripngd/ripngd.h"
#include "ripngd/ripng_nexthop.h"


/* Linked list of RIPng peer. */
struct list *peer_list;

static struct ripng_peer *ripng_peer_new(void)
{
	return XCALLOC(MTYPE_RIPNG_PEER, sizeof(struct ripng_peer));
}

static void ripng_peer_free(struct ripng_peer *peer)
{
	XFREE(MTYPE_RIPNG_PEER, peer);
}

struct ripng_peer *ripng_peer_lookup(struct in6_addr *addr)
{
	struct ripng_peer *peer;
	struct listnode *node, *nnode;

	for (ALL_LIST_ELEMENTS(peer_list, node, nnode, peer)) {
		if (IPV6_ADDR_SAME(&peer->addr, addr))
			return peer;
	}
	return NULL;
}

struct ripng_peer *ripng_peer_lookup_next(struct in6_addr *addr)
{
	struct ripng_peer *peer;
	struct listnode *node, *nnode;

	for (ALL_LIST_ELEMENTS(peer_list, node, nnode, peer)) {
		if (addr6_cmp(&peer->addr, addr) > 0)
			return peer;
	}
	return NULL;
}

/* RIPng peer is timeout.
 * Garbage collector.
 **/
static int ripng_peer_timeout(struct thread *t)
{
	struct ripng_peer *peer;

	peer = THREAD_ARG(t);
	listnode_delete(peer_list, peer);
	ripng_peer_free(peer);

	return 0;
}

/* Get RIPng peer.  At the same time update timeout thread. */
static struct ripng_peer *ripng_peer_get(struct in6_addr *addr)
{
	struct ripng_peer *peer;

	peer = ripng_peer_lookup(addr);

	if (peer) {
		if (peer->t_timeout)
			thread_cancel(peer->t_timeout);
	} else {
		peer = ripng_peer_new();
		peer->addr = *addr; /* XXX */
		listnode_add_sort(peer_list, peer);
	}

	/* Update timeout thread. */
	peer->t_timeout = NULL;
	thread_add_timer(master, ripng_peer_timeout, peer,
			 RIPNG_PEER_TIMER_DEFAULT, &peer->t_timeout);

	/* Last update time set. */
	time(&peer->uptime);

	return peer;
}

void ripng_peer_update(struct sockaddr_in6 *from, uint8_t version)
{
	struct ripng_peer *peer;
	peer = ripng_peer_get(&from->sin6_addr);
	peer->version = version;
}

void ripng_peer_bad_route(struct sockaddr_in6 *from)
{
	struct ripng_peer *peer;
	peer = ripng_peer_get(&from->sin6_addr);
	peer->recv_badroutes++;
}

void ripng_peer_bad_packet(struct sockaddr_in6 *from)
{
	struct ripng_peer *peer;
	peer = ripng_peer_get(&from->sin6_addr);
	peer->recv_badpackets++;
}

/* Display peer uptime. */
static char *ripng_peer_uptime(struct ripng_peer *peer, char *buf, size_t len)
{
	time_t uptime;
	struct tm *tm;

	/* If there is no connection has been done before print `never'. */
	if (peer->uptime == 0) {
		snprintf(buf, len, "never   ");
		return buf;
	}

	/* Get current time. */
	uptime = time(NULL);
	uptime -= peer->uptime;
	tm = gmtime(&uptime);

	if (uptime < ONE_DAY_SECOND)
		snprintf(buf, len, "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
			 tm->tm_sec);
	else if (uptime < ONE_WEEK_SECOND)
		snprintf(buf, len, "%dd%02dh%02dm", tm->tm_yday, tm->tm_hour,
			 tm->tm_min);
	else
		snprintf(buf, len, "%02dw%dd%02dh", tm->tm_yday / 7,
			 tm->tm_yday - ((tm->tm_yday / 7) * 7), tm->tm_hour);
	return buf;
}

void ripng_peer_display(struct vty *vty)
{
	struct ripng_peer *peer;
	struct listnode *node, *nnode;
#define RIPNG_UPTIME_LEN 25
	char timebuf[RIPNG_UPTIME_LEN];

	for (ALL_LIST_ELEMENTS(peer_list, node, nnode, peer)) {
		vty_out(vty, "    %s \n%14s %10d %10d %10d      %s\n",
			inet6_ntoa(peer->addr), " ", peer->recv_badpackets,
			peer->recv_badroutes, ZEBRA_RIPNG_DISTANCE_DEFAULT,
			ripng_peer_uptime(peer, timebuf, RIPNG_UPTIME_LEN));
	}
}

static int ripng_peer_list_cmp(struct ripng_peer *p1, struct ripng_peer *p2)
{
	return memcmp(&p1->addr, &p2->addr, sizeof(struct in6_addr));
}

void ripng_peer_init()
{
	peer_list = list_new();
	peer_list->cmp = (int (*)(void *, void *))ripng_peer_list_cmp;
}