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/*

 * Copyright (c) 2002 CITEL Technologies Ltd.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 * This file is a contribution to the lwIP TCP/IP stack.

 * The Swedish Institute of Computer Science and Adam Dunkels

 * are specifically granted permission to redistribute this

 * source code.

*/

#ifndef __LWIP_IGMP_H__

#define __LWIP_IGMP_H__

#include "lwip/opt.h"

#include "lwip/ip_addr.h"

#include "lwip/netif.h"

#include "lwip/pbuf.h"

#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */

#ifdef __cplusplus

extern "C" {

#endif

/*

 * IGMP constants

 */

#define IP_PROTO_IGMP                  2

#define IGMP_TTL                       1

#define IGMP_MINLEN                    8

#define ROUTER_ALERT                   0x9404

#define ROUTER_ALERTLEN                4

/*

 * IGMP message types, including version number.

 */

#define IGMP_MEMB_QUERY                0x11 /* Membership query         */

#define IGMP_V1_MEMB_REPORT            0x12 /* Ver. 1 membership report */

#define IGMP_V2_MEMB_REPORT            0x16 /* Ver. 2 membership report */

#define IGMP_LEAVE_GROUP               0x17 /* Leave-group message      */

/* IGMP timer */

#define IGMP_TMR_INTERVAL              100 /* Milliseconds */

#define IGMP_V1_DELAYING_MEMBER_TMR   (1000/IGMP_TMR_INTERVAL)

#define IGMP_JOIN_DELAYING_MEMBER_TMR (500 /IGMP_TMR_INTERVAL)

/* MAC Filter Actions */

#define IGMP_DEL_MAC_FILTER            0

#define IGMP_ADD_MAC_FILTER            1

/* Group  membership states */

#define IGMP_GROUP_NON_MEMBER          0

#define IGMP_GROUP_DELAYING_MEMBER     1

#define IGMP_GROUP_IDLE_MEMBER         2

/*

 * IGMP packet format.

 */

#ifdef PACK_STRUCT_USE_INCLUDES

#  include "arch/bpstruct.h"

#endif

PACK_STRUCT_BEGIN

struct igmp_msg {

 PACK_STRUCT_FIELD(u8_t           igmp_msgtype);

 PACK_STRUCT_FIELD(u8_t           igmp_maxresp);

 PACK_STRUCT_FIELD(u16_t          igmp_checksum);

 PACK_STRUCT_FIELD(struct ip_addr igmp_group_address);

} PACK_STRUCT_STRUCT;

PACK_STRUCT_END

#ifdef PACK_STRUCT_USE_INCLUDES

#  include "arch/epstruct.h"

#endif

/*

 * now a group structure - there is

 * a list of groups for each interface

 * these should really be linked from the interface, but

 * if we keep them separate we will not affect the lwip original code

 * too much

 *

 * There will be a group for the all systems group address but this

 * will not run the state machine as it is used to kick off reports

 * from all the other groups

 */

struct igmp_group {

  struct igmp_group *next;

  struct netif      *interface;

  struct ip_addr     group_address;

  u8_t               last_reporter_flag; /* signifies we were the last person to report */

  u8_t               group_state;

  u16_t              timer;

  u8_t               use; /* counter of simultaneous uses */

};

/*  Prototypes */

void   igmp_init(void);

err_t  igmp_start( struct netif *netif);

err_t  igmp_stop( struct netif *netif);

void   igmp_report_groups( struct netif *netif);

struct igmp_group *igmp_lookfor_group( struct netif *ifp, struct ip_addr *addr);

struct igmp_group *igmp_lookup_group( struct netif *ifp, struct ip_addr *addr);

err_t  igmp_remove_group( struct igmp_group *group);

void   igmp_input( struct pbuf *p, struct netif *inp, struct ip_addr *dest);

err_t  igmp_joingroup( struct ip_addr *ifaddr, struct ip_addr *groupaddr);

err_t  igmp_leavegroup( struct ip_addr *ifaddr, struct ip_addr *groupaddr);

void   igmp_tmr(void);

void   igmp_timeout( struct igmp_group *group);

void   igmp_start_timer( struct igmp_group *group, u8_t max_time);

void   igmp_stop_timer( struct igmp_group *group);

void   igmp_delaying_member( struct igmp_group *group, u8_t maxresp);

err_t  igmp_ip_output_if( struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, u8_t ttl, u8_t proto, struct netif *netif);

void   igmp_send( struct igmp_group *group, u8_t type);

#ifdef __cplusplus

}

#endif

#endif /* LWIP_IGMP */

#endif /* __LWIP_IGMP_H__ */