1/**
2 * @file
3 * IGMP protocol definitions
4 */
5
6/*
7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without modification,
11 * are permitted provided that the following conditions are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright notice,
14 *    this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright notice,
16 *    this list of conditions and the following disclaimer in the documentation
17 *    and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 *
32 * This file is part of the lwIP TCP/IP stack.
33 *
34 * Author: Adam Dunkels <adam@sics.se>
35 *
36 */
37#ifndef LWIP_HDR_PROT_IGMP_H
38#define LWIP_HDR_PROT_IGMP_H
39
40#include "lwip/arch.h"
41#include "lwip/ip4_addr.h"
42
43#ifdef __cplusplus
44extern "C" {
45#endif
46
47/*
48 * IGMP constants
49 */
50#define IGMP_TTL                       1
51#define IGMP_MINLEN                    8
52#define ROUTER_ALERT                   0x9404U
53#define ROUTER_ALERTLEN                4
54
55/*
56 * IGMP message types, including version number.
57 */
58#define IGMP_MEMB_QUERY                0x11 /* Membership query         */
59#define IGMP_V1_MEMB_REPORT            0x12 /* Ver. 1 membership report */
60#define IGMP_V2_MEMB_REPORT            0x16 /* Ver. 2 membership report */
61#define IGMP_LEAVE_GROUP               0x17 /* Leave-group message      */
62
63/* Group  membership states */
64#define IGMP_GROUP_NON_MEMBER          0
65#define IGMP_GROUP_DELAYING_MEMBER     1
66#define IGMP_GROUP_IDLE_MEMBER         2
67
68/**
69 * IGMP packet format.
70 */
71#ifdef PACK_STRUCT_USE_INCLUDES
72#  include "arch/bpstruct.h"
73#endif
74PACK_STRUCT_BEGIN
75struct igmp_msg {
76  PACK_STRUCT_FLD_8(u8_t         igmp_msgtype);
77  PACK_STRUCT_FLD_8(u8_t         igmp_maxresp);
78  PACK_STRUCT_FIELD(u16_t        igmp_checksum);
79  PACK_STRUCT_FLD_S(ip4_addr_p_t igmp_group_address);
80} PACK_STRUCT_STRUCT;
81PACK_STRUCT_END
82#ifdef PACK_STRUCT_USE_INCLUDES
83#  include "arch/epstruct.h"
84#endif
85
86#ifdef __cplusplus
87}
88#endif
89
90#endif /* LWIP_HDR_PROT_IGMP_H */
91