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1 office 1 /**
2 * @file
3 *
4 * Multicast listener discovery for IPv6. Aims to be compliant with RFC 2710.
5 * No support for MLDv2.
6 */
7  
8 /*
9 * Copyright (c) 2010 Inico Technologies Ltd.
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without modification,
13 * are permitted provided that the following conditions are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright notice,
16 * this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright notice,
18 * this list of conditions and the following disclaimer in the documentation
19 * and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
26 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
31 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
32 * OF SUCH DAMAGE.
33 *
34 * This file is part of the lwIP TCP/IP stack.
35 *
36 * Author: Ivan Delamer <delamer@inicotech.com>
37 *
38 *
39 * Please coordinate changes and requests with Ivan Delamer
40 * <delamer@inicotech.com>
41 */
42  
43 #ifndef LWIP_HDR_MLD6_H
44 #define LWIP_HDR_MLD6_H
45  
46 #include "lwip/opt.h"
47  
48 #if LWIP_IPV6_MLD && LWIP_IPV6 /* don't build if not configured for use in lwipopts.h */
49  
50 #include "lwip/pbuf.h"
51 #include "lwip/netif.h"
52  
53 #ifdef __cplusplus
54 extern "C" {
55 #endif
56  
57 /** MLD group */
58 struct mld_group {
59 /** next link */
60 struct mld_group *next;
61 /** multicast address */
62 ip6_addr_t group_address;
63 /** signifies we were the last person to report */
64 u8_t last_reporter_flag;
65 /** current state of the group */
66 u8_t group_state;
67 /** timer for reporting */
68 u16_t timer;
69 /** counter of simultaneous uses */
70 u8_t use;
71 };
72  
73 #define MLD6_TMR_INTERVAL 100 /* Milliseconds */
74  
75 err_t mld6_stop(struct netif *netif);
76 void mld6_report_groups(struct netif *netif);
77 void mld6_tmr(void);
78 struct mld_group *mld6_lookfor_group(struct netif *ifp, const ip6_addr_t *addr);
79 void mld6_input(struct pbuf *p, struct netif *inp);
80 err_t mld6_joingroup(const ip6_addr_t *srcaddr, const ip6_addr_t *groupaddr);
81 err_t mld6_joingroup_netif(struct netif *netif, const ip6_addr_t *groupaddr);
82 err_t mld6_leavegroup(const ip6_addr_t *srcaddr, const ip6_addr_t *groupaddr);
83 err_t mld6_leavegroup_netif(struct netif *netif, const ip6_addr_t *groupaddr);
84  
85 /** @ingroup mld6
86 * Get list head of MLD6 groups for netif.
87 * Note: The allnodes group IP is NOT in the list, since it must always
88 * be received for correct IPv6 operation.
89 * @see @ref netif_set_mld_mac_filter()
90 */
91 #define netif_mld6_data(netif) ((struct mld_group *)netif_get_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_MLD6))
92  
93 #ifdef __cplusplus
94 }
95 #endif
96  
97 #endif /* LWIP_IPV6_MLD && LWIP_IPV6 */
98  
99 #endif /* LWIP_HDR_MLD6_H */