/*
 * 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
 */
 
#ifndef PIM_IFCHANNEL_H
#define PIM_IFCHANNEL_H
 
#include <zebra.h>
 
#include "if.h"
#include "prefix.h"
 
struct pim_ifchannel;
#include "pim_upstream.h"
 
enum pim_ifmembership { PIM_IFMEMBERSHIP_NOINFO, PIM_IFMEMBERSHIP_INCLUDE };
 
enum pim_ifjoin_state {
	PIM_IFJOIN_NOINFO,
	PIM_IFJOIN_JOIN,
	PIM_IFJOIN_PRUNE,
	PIM_IFJOIN_PRUNE_PENDING,
	PIM_IFJOIN_PRUNE_TMP,
	PIM_IFJOIN_PRUNE_PENDING_TMP,
};
 
enum pim_ifassert_state {
	PIM_IFASSERT_NOINFO,
	PIM_IFASSERT_I_AM_WINNER,
	PIM_IFASSERT_I_AM_LOSER
};
 
struct pim_assert_metric {
	uint32_t rpt_bit_flag;
	uint32_t metric_preference;
	uint32_t route_metric;
	struct in_addr ip_address; /* neighbor router that sourced the Assert
				      message */
};
 
/*
  Flag to detect change in CouldAssert(S,G,I)
*/
#define PIM_IF_FLAG_MASK_COULD_ASSERT (1 << 0)
#define PIM_IF_FLAG_TEST_COULD_ASSERT(flags) ((flags) & PIM_IF_FLAG_MASK_COULD_ASSERT)
#define PIM_IF_FLAG_SET_COULD_ASSERT(flags) ((flags) |= PIM_IF_FLAG_MASK_COULD_ASSERT)
#define PIM_IF_FLAG_UNSET_COULD_ASSERT(flags) ((flags) &= ~PIM_IF_FLAG_MASK_COULD_ASSERT)
/*
  Flag to detect change in AssertTrackingDesired(S,G,I)
*/
#define PIM_IF_FLAG_MASK_ASSERT_TRACKING_DESIRED (1 << 1)
#define PIM_IF_FLAG_TEST_ASSERT_TRACKING_DESIRED(flags) ((flags) & PIM_IF_FLAG_MASK_ASSERT_TRACKING_DESIRED)
#define PIM_IF_FLAG_SET_ASSERT_TRACKING_DESIRED(flags) ((flags) |= PIM_IF_FLAG_MASK_ASSERT_TRACKING_DESIRED)
#define PIM_IF_FLAG_UNSET_ASSERT_TRACKING_DESIRED(flags) ((flags) &= ~PIM_IF_FLAG_MASK_ASSERT_TRACKING_DESIRED)
 
/*
 * Flat to tell us if the ifchannel is (S,G,rpt)
 */
#define PIM_IF_FLAG_MASK_S_G_RPT         (1 << 2)
#define PIM_IF_FLAG_TEST_S_G_RPT(flags)  ((flags) & PIM_IF_FLAG_MASK_S_G_RPT)
#define PIM_IF_FLAG_SET_S_G_RPT(flags)   ((flags) |= PIM_IF_FLAG_MASK_S_G_RPT)
#define PIM_IF_FLAG_UNSET_S_G_RPT(flags) ((flags) &= ~PIM_IF_FLAG_MASK_S_G_RPT)
 
/*
  Per-interface (S,G) state
*/
struct pim_ifchannel {
	RB_ENTRY(rb_ifchannel) pim_ifp_rb;
 
	struct pim_ifchannel *parent;
	struct list *sources;
	struct prefix_sg sg;
	char sg_str[PIM_SG_LEN];
	struct interface *interface; /* backpointer to interface */
	uint32_t flags;
 
	/* IGMPv3 determined interface has local members for (S,G) ? */
	enum pim_ifmembership local_ifmembership;
 
	/* Per-interface (S,G) Join/Prune State (Section 4.1.4 of RFC4601) */
	enum pim_ifjoin_state ifjoin_state;
	struct thread *t_ifjoin_expiry_timer;
	struct thread *t_ifjoin_prune_pending_timer;
	int64_t ifjoin_creation; /* Record uptime of ifjoin state */
 
	/* Per-interface (S,G) Assert State (Section 4.6.1 of RFC4601) */
	enum pim_ifassert_state ifassert_state;
	struct thread *t_ifassert_timer;
	struct in_addr ifassert_winner;
	struct pim_assert_metric ifassert_winner_metric;
	int64_t ifassert_creation; /* Record uptime of ifassert state */
	struct pim_assert_metric ifassert_my_metric;
 
	/* Upstream (S,G) state */
	struct pim_upstream *upstream;
};
 
RB_HEAD(pim_ifchannel_rb, pim_ifchannel);
RB_PROTOTYPE(pim_ifchannel_rb, pim_ifchannel, pim_ifp_rb,
	     pim_ifchannel_compare);
 
void pim_ifchannel_delete(struct pim_ifchannel *ch);
void pim_ifchannel_delete_all(struct interface *ifp);
void pim_ifchannel_membership_clear(struct interface *ifp);
void pim_ifchannel_delete_on_noinfo(struct interface *ifp);
struct pim_ifchannel *pim_ifchannel_find(struct interface *ifp,
					 struct prefix_sg *sg);
struct pim_ifchannel *pim_ifchannel_add(struct interface *ifp,
					struct prefix_sg *sg, uint8_t ch_flags,
					int up_flags);
void pim_ifchannel_join_add(struct interface *ifp, struct in_addr neigh_addr,
			    struct in_addr upstream, struct prefix_sg *sg,
			    uint8_t source_flags, uint16_t holdtime);
void pim_ifchannel_prune(struct interface *ifp, struct in_addr upstream,
			 struct prefix_sg *sg, uint8_t source_flags,
			 uint16_t holdtime);
int pim_ifchannel_local_membership_add(struct interface *ifp,
				       struct prefix_sg *sg);
void pim_ifchannel_local_membership_del(struct interface *ifp,
					struct prefix_sg *sg);
 
void pim_ifchannel_ifjoin_switch(const char *caller, struct pim_ifchannel *ch,
				 enum pim_ifjoin_state new_state);
const char *pim_ifchannel_ifjoin_name(enum pim_ifjoin_state ifjoin_state,
				      int flags);
const char *pim_ifchannel_ifassert_name(enum pim_ifassert_state ifassert_state);
 
int pim_ifchannel_isin_oiflist(struct pim_ifchannel *ch);
 
void reset_ifassert_state(struct pim_ifchannel *ch);
 
void pim_ifchannel_update_could_assert(struct pim_ifchannel *ch);
void pim_ifchannel_update_my_assert_metric(struct pim_ifchannel *ch);
void pim_ifchannel_update_assert_tracking_desired(struct pim_ifchannel *ch);
 
void pim_ifchannel_scan_forward_start(struct interface *new_ifp);
void pim_ifchannel_set_star_g_join_state(struct pim_ifchannel *ch, int eom,
					 uint8_t join);
 
int pim_ifchannel_compare(const struct pim_ifchannel *ch1,
			  const struct pim_ifchannel *ch2);
 
unsigned int pim_ifchannel_hash_key(void *arg);
#endif /* PIM_IFCHANNEL_H */