/*
  PIM for Quagga
  Copyright (C) 2008  Everton da Silva Marques

  This program 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 of the License, or
  (at your option) any later version.

  This program 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
  
  $QuaggaId: $Format:%an, %ai, %h$ $
*/

#ifndef PIM_ASSERT_H
#define PIM_ASSERT_H

#include <zebra.h>

#include "if.h"

#include "pim_neighbor.h"
#include "pim_ifchannel.h"

/*
  RFC 4601: 4.11.  Timer Values

  Note that for historical reasons, the Assert message lacks a
  Holdtime field.  Thus, changing the Assert Time from the default
  value is not recommended.
 */
#define PIM_ASSERT_OVERRIDE_INTERVAL (3)   /* seconds */
#define PIM_ASSERT_TIME              (180) /* seconds */

#define PIM_ASSERT_METRIC_PREFERENCE_MAX (0xFFFFFFFF)
#define PIM_ASSERT_ROUTE_METRIC_MAX      (0xFFFFFFFF)

void pim_ifassert_winner_set(struct pim_ifchannel     *ch,
			     enum pim_ifassert_state   new_state,
			     struct in_addr            winner,
			     struct pim_assert_metric  winner_metric);

int pim_assert_recv(struct interface *ifp,
		    struct pim_neighbor *neigh,
		    struct in_addr src_addr,
		    uint8_t *buf, int buf_size);

int pim_assert_metric_better(const struct pim_assert_metric *m1,
			     const struct pim_assert_metric *m2);
int pim_assert_metric_match(const struct pim_assert_metric *m1,
			    const struct pim_assert_metric *m2);

int pim_assert_build_msg(uint8_t *pim_msg, int buf_size,
			 struct interface *ifp,
			 struct in_addr group_addr,
			 struct in_addr source_addr,
			 uint32_t metric_preference,
			 uint32_t route_metric,
			 uint32_t rpt_bit_flag);

int pim_assert_send(struct pim_ifchannel *ch);

int assert_action_a1(struct pim_ifchannel *ch);
void assert_action_a4(struct pim_ifchannel *ch);
void assert_action_a5(struct pim_ifchannel *ch);

#endif /* PIM_ASSERT_H */