lib/liblwip/include/ipv4/lwip/igmp.h

   1 /*
   2  * Copyright (c) 2002 CITEL Technologies Ltd.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
  18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * This file is a contribution to the lwIP TCP/IP stack.
  30  * The Swedish Institute of Computer Science and Adam Dunkels
  31  * are specifically granted permission to redistribute this
  32  * source code.
  33 */
  34
  35 #ifndef __LWIP_IGMP_H__
  36 #define __LWIP_IGMP_H__
  37
  38 #include "lwip/opt.h"
  39 #include "lwip/ip_addr.h"
  40 #include "lwip/netif.h"
  41 #include "lwip/pbuf.h"
  42
  43 #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
  44
  45 #ifdef __cplusplus
  46 extern "C" {
  47 #endif
  48
  49
  50 /* IGMP timer */
  51 #define IGMP_TMR_INTERVAL              100 /* Milliseconds */
  52 #define IGMP_V1_DELAYING_MEMBER_TMR   (1000/IGMP_TMR_INTERVAL)
  53 #define IGMP_JOIN_DELAYING_MEMBER_TMR (500 /IGMP_TMR_INTERVAL)
  54
  55 /* MAC Filter Actions, these are passed to a netif's
  56  * igmp_mac_filter callback function. */
  57 #define IGMP_DEL_MAC_FILTER            0
  58 #define IGMP_ADD_MAC_FILTER            1
  59
  60
  61 /**
  62  * igmp group structure - there is
  63  * a list of groups for each interface
  64  * these should really be linked from the interface, but
  65  * if we keep them separate we will not affect the lwip original code
  66  * too much
  67  *
  68  * There will be a group for the all systems group address but this
  69  * will not run the state machine as it is used to kick off reports
  70  * from all the other groups
  71  */
  72 struct igmp_group {
  73   /** next link */
  74   struct igmp_group *next;
  75   /** interface on which the group is active */
  76   struct netif      *netif;
  77   /** multicast address */
  78   ip_addr_t          group_address;
  79   /** signifies we were the last person to report */
  80   u8_t               last_reporter_flag;
  81   /** current state of the group */
  82   u8_t               group_state;
  83   /** timer for reporting, negative is OFF */
  84   u16_t              timer;
  85   /** counter of simultaneous uses */
  86   u8_t               use;
  87 };
  88
  89 /*  Prototypes */
  90 void   igmp_init(void);
  91 err_t  igmp_start(struct netif *netif);
  92 err_t  igmp_stop(struct netif *netif);
  93 void   igmp_report_groups(struct netif *netif);
  94 struct igmp_group *igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr);
  95 void   igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest);
  96 err_t  igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr);
  97 err_t  igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr);
  98 void   igmp_tmr(void);
  99
 100 #ifdef __cplusplus
 101 }
 102 #endif
 103
 104 #endif /* LWIP_IGMP */
 105
 106 #endif /* __LWIP_IGMP_H__ */