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/**
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* @file
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* IGMP - Internet Group Management Protocol
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*
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*/
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/*
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* Copyright (c) 2002 CITEL Technologies Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is a contribution to the lwIP TCP/IP stack.
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* The Swedish Institute of Computer Science and Adam Dunkels
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* are specifically granted permission to redistribute this
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* source code.
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*/
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/*-------------------------------------------------------------
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Note 1)
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Although the rfc requires V1 AND V2 capability
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we will only support v2 since now V1 is very old (August 1989)
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V1 can be added if required
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a debug print and statistic have been implemented to
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show this up.
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-------------------------------------------------------------
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-------------------------------------------------------------
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Note 2)
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A query for a specific group address (as opposed to ALLHOSTS)
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has now been implemented as I am unsure if it is required
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a debug print and statistic have been implemented to
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show this up.
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-------------------------------------------------------------
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-------------------------------------------------------------
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Note 3)
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The router alert rfc 2113 is implemented in outgoing packets
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but not checked rigorously incoming
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-------------------------------------------------------------
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Steve Reynolds
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------------------------------------------------------------*/
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/*-----------------------------------------------------------------------------
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* RFC 988 - Host extensions for IP multicasting - V0
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* RFC 1054 - Host extensions for IP multicasting -
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* RFC 1112 - Host extensions for IP multicasting - V1
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* RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
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* RFC 3376 - Internet Group Management Protocol, Version 3 - V3
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* RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
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* RFC 2113 - IP Router Alert Option -
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*----------------------------------------------------------------------------*/
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/*-----------------------------------------------------------------------------
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* Includes
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*----------------------------------------------------------------------------*/
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#include "lwip/opt.h"
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#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/igmp.h"
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#include "lwip/debug.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/ip.h"
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#include "lwip/inet_chksum.h"
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#include "lwip/netif.h"
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#include "lwip/icmp.h"
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#include "lwip/udp.h"
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#include "lwip/tcp.h"
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#include "lwip/stats.h"
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#include "string.h"
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/*
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* IGMP constants
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*/
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#define IGMP_TTL 1
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#define IGMP_MINLEN 8
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#define ROUTER_ALERT 0x9404
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#define ROUTER_ALERTLEN 4
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/*
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* IGMP message types, including version number.
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*/
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#define IGMP_MEMB_QUERY 0x11 /* Membership query */
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#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
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#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
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#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
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113
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/* Group membership states */
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#define IGMP_GROUP_NON_MEMBER 0
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#define IGMP_GROUP_DELAYING_MEMBER 1
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#define IGMP_GROUP_IDLE_MEMBER 2
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/**
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* IGMP packet format.
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*/
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct igmp_msg {
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PACK_STRUCT_FIELD(u8_t igmp_msgtype);
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PACK_STRUCT_FIELD(u8_t igmp_maxresp);
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PACK_STRUCT_FIELD(u16_t igmp_checksum);
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PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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static struct igmp_group *igmp_lookup_group(struct netif *ifp, ip_addr_t *addr);
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static err_t igmp_remove_group(struct igmp_group *group);
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static void igmp_timeout( struct igmp_group *group);
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static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
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static void igmp_stop_timer(struct igmp_group *group);
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static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
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static err_t igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif);
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static void igmp_send(struct igmp_group *group, u8_t type);
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147
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static struct igmp_group* igmp_group_list;
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149
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static ip_addr_t allsystems;
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150
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static ip_addr_t allrouters;
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151
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152
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153
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/**
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154
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* Initialize the IGMP module
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155
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*/
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156
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void
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157
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igmp_init(void)
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{
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159
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LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
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160
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161
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IP4_ADDR(&allsystems, 224, 0, 0, 1);
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162
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IP4_ADDR(&allrouters, 224, 0, 0, 2);
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163
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}
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164
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| mbed714 |
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165
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#ifdef LWIP_DEBUG
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| mbed714 |
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166
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/**
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| mbed714 |
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167
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* Dump global IGMP groups list
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168
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*/
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169
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void
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170
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igmp_dump_group_list()
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171
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{
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172
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struct igmp_group *group = igmp_group_list;
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173
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174
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while (group != NULL) {
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175
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LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
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176
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ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
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177
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LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
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178
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group = group->next;
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179
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}
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180
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LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
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181
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}
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182
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#else
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183
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#define igmp_dump_group_list()
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184
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#endif /* LWIP_DEBUG */
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185
|
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186
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/**
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187
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* Start IGMP processing on interface
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188
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*
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189
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* @param netif network interface on which start IGMP processing
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190
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*/
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err_t
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igmp_start(struct netif *netif)
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{
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194
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struct igmp_group* group;
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195
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196
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LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
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197
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group = igmp_lookup_group(netif, &allsystems);
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199
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200
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if (group != NULL) {
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201
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group->group_state = IGMP_GROUP_IDLE_MEMBER;
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202
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group->use++;
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203
|
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204
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/* Allow the igmp messages at the MAC level */
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205
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if (netif->igmp_mac_filter != NULL) {
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206
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LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
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207
|
ip_addr_debug_print(IGMP_DEBUG, &allsystems);
|
| mbed714 |
0:d616ece2d859
|
208
|
LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
|
| mbed714 |
0:d616ece2d859
|
209
|
netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
|
| mbed714 |
0:d616ece2d859
|
210
|
}
|
| mbed714 |
0:d616ece2d859
|
211
|
|
| mbed714 |
0:d616ece2d859
|
212
|
return ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
213
|
}
|
| mbed714 |
0:d616ece2d859
|
214
|
|
| mbed714 |
0:d616ece2d859
|
215
|
return ERR_MEM;
|
| mbed714 |
0:d616ece2d859
|
216
|
}
|
| mbed714 |
0:d616ece2d859
|
217
|
|
| mbed714 |
0:d616ece2d859
|
218
|
/**
|
| mbed714 |
0:d616ece2d859
|
219
|
* Stop IGMP processing on interface
|
| mbed714 |
0:d616ece2d859
|
220
|
*
|
| mbed714 |
0:d616ece2d859
|
221
|
* @param netif network interface on which stop IGMP processing
|
| mbed714 |
0:d616ece2d859
|
222
|
*/
|
| mbed714 |
0:d616ece2d859
|
223
|
err_t
|
| mbed714 |
0:d616ece2d859
|
224
|
igmp_stop(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
225
|
{
|
| mbed714 |
0:d616ece2d859
|
226
|
struct igmp_group *group = igmp_group_list;
|
| mbed714 |
0:d616ece2d859
|
227
|
struct igmp_group *prev = NULL;
|
| mbed714 |
0:d616ece2d859
|
228
|
struct igmp_group *next;
|
| mbed714 |
0:d616ece2d859
|
229
|
|
| mbed714 |
0:d616ece2d859
|
230
|
/* look for groups joined on this interface further down the list */
|
| mbed714 |
0:d616ece2d859
|
231
|
while (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
232
|
next = group->next;
|
| mbed714 |
0:d616ece2d859
|
233
|
/* is it a group joined on this interface? */
|
| mbed714 |
0:d616ece2d859
|
234
|
if (group->netif == netif) {
|
| mbed714 |
0:d616ece2d859
|
235
|
/* is it the first group of the list? */
|
| mbed714 |
0:d616ece2d859
|
236
|
if (group == igmp_group_list) {
|
| mbed714 |
0:d616ece2d859
|
237
|
igmp_group_list = next;
|
| mbed714 |
0:d616ece2d859
|
238
|
}
|
| mbed714 |
0:d616ece2d859
|
239
|
/* is there a "previous" group defined? */
|
| mbed714 |
0:d616ece2d859
|
240
|
if (prev != NULL) {
|
| mbed714 |
0:d616ece2d859
|
241
|
prev->next = next;
|
| mbed714 |
0:d616ece2d859
|
242
|
}
|
| mbed714 |
0:d616ece2d859
|
243
|
/* disable the group at the MAC level */
|
| mbed714 |
0:d616ece2d859
|
244
|
if (netif->igmp_mac_filter != NULL) {
|
| mbed714 |
0:d616ece2d859
|
245
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
|
| mbed714 |
0:d616ece2d859
|
246
|
ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
|
| mbed714 |
0:d616ece2d859
|
247
|
LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
|
| mbed714 |
0:d616ece2d859
|
248
|
netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
|
| mbed714 |
0:d616ece2d859
|
249
|
}
|
| mbed714 |
0:d616ece2d859
|
250
|
/* free group */
|
| mbed714 |
0:d616ece2d859
|
251
|
memp_free(MEMP_IGMP_GROUP, group);
|
| mbed714 |
0:d616ece2d859
|
252
|
} else {
|
| mbed714 |
0:d616ece2d859
|
253
|
/* change the "previous" */
|
| mbed714 |
0:d616ece2d859
|
254
|
prev = group;
|
| mbed714 |
0:d616ece2d859
|
255
|
}
|
| mbed714 |
0:d616ece2d859
|
256
|
/* move to "next" */
|
| mbed714 |
0:d616ece2d859
|
257
|
group = next;
|
| mbed714 |
0:d616ece2d859
|
258
|
}
|
| mbed714 |
0:d616ece2d859
|
259
|
return ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
260
|
}
|
| mbed714 |
0:d616ece2d859
|
261
|
|
| mbed714 |
0:d616ece2d859
|
262
|
/**
|
| mbed714 |
0:d616ece2d859
|
263
|
* Report IGMP memberships for this interface
|
| mbed714 |
0:d616ece2d859
|
264
|
*
|
| mbed714 |
0:d616ece2d859
|
265
|
* @param netif network interface on which report IGMP memberships
|
| mbed714 |
0:d616ece2d859
|
266
|
*/
|
| mbed714 |
0:d616ece2d859
|
267
|
void
|
| mbed714 |
0:d616ece2d859
|
268
|
igmp_report_groups(struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
269
|
{
|
| mbed714 |
0:d616ece2d859
|
270
|
struct igmp_group *group = igmp_group_list;
|
| mbed714 |
0:d616ece2d859
|
271
|
|
| mbed714 |
0:d616ece2d859
|
272
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
|
| mbed714 |
0:d616ece2d859
|
273
|
|
| mbed714 |
0:d616ece2d859
|
274
|
while (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
275
|
if (group->netif == netif) {
|
| mbed714 |
0:d616ece2d859
|
276
|
igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
|
| mbed714 |
0:d616ece2d859
|
277
|
}
|
| mbed714 |
0:d616ece2d859
|
278
|
group = group->next;
|
| mbed714 |
0:d616ece2d859
|
279
|
}
|
| mbed714 |
0:d616ece2d859
|
280
|
}
|
| mbed714 |
0:d616ece2d859
|
281
|
|
| mbed714 |
0:d616ece2d859
|
282
|
/**
|
| mbed714 |
0:d616ece2d859
|
283
|
* Search for a group in the global igmp_group_list
|
| mbed714 |
0:d616ece2d859
|
284
|
*
|
| mbed714 |
0:d616ece2d859
|
285
|
* @param ifp the network interface for which to look
|
| mbed714 |
0:d616ece2d859
|
286
|
* @param addr the group ip address to search for
|
| mbed714 |
0:d616ece2d859
|
287
|
* @return a struct igmp_group* if the group has been found,
|
| mbed714 |
0:d616ece2d859
|
288
|
* NULL if the group wasn't found.
|
| mbed714 |
0:d616ece2d859
|
289
|
*/
|
| mbed714 |
0:d616ece2d859
|
290
|
struct igmp_group *
|
| mbed714 |
0:d616ece2d859
|
291
|
igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr)
|
| mbed714 |
0:d616ece2d859
|
292
|
{
|
| mbed714 |
0:d616ece2d859
|
293
|
struct igmp_group *group = igmp_group_list;
|
| mbed714 |
0:d616ece2d859
|
294
|
|
| mbed714 |
0:d616ece2d859
|
295
|
while (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
296
|
if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
|
| mbed714 |
0:d616ece2d859
|
297
|
return group;
|
| mbed714 |
0:d616ece2d859
|
298
|
}
|
| mbed714 |
0:d616ece2d859
|
299
|
group = group->next;
|
| mbed714 |
0:d616ece2d859
|
300
|
}
|
| mbed714 |
0:d616ece2d859
|
301
|
|
| mbed714 |
0:d616ece2d859
|
302
|
/* to be clearer, we return NULL here instead of
|
| mbed714 |
0:d616ece2d859
|
303
|
* 'group' (which is also NULL at this point).
|
| mbed714 |
0:d616ece2d859
|
304
|
*/
|
| mbed714 |
0:d616ece2d859
|
305
|
return NULL;
|
| mbed714 |
0:d616ece2d859
|
306
|
}
|
| mbed714 |
0:d616ece2d859
|
307
|
|
| mbed714 |
0:d616ece2d859
|
308
|
/**
|
| mbed714 |
0:d616ece2d859
|
309
|
* Search for a specific igmp group and create a new one if not found-
|
| mbed714 |
0:d616ece2d859
|
310
|
*
|
| mbed714 |
0:d616ece2d859
|
311
|
* @param ifp the network interface for which to look
|
| mbed714 |
0:d616ece2d859
|
312
|
* @param addr the group ip address to search
|
| mbed714 |
0:d616ece2d859
|
313
|
* @return a struct igmp_group*,
|
| mbed714 |
0:d616ece2d859
|
314
|
* NULL on memory error.
|
| mbed714 |
0:d616ece2d859
|
315
|
*/
|
| mbed714 |
0:d616ece2d859
|
316
|
struct igmp_group *
|
| mbed714 |
0:d616ece2d859
|
317
|
igmp_lookup_group(struct netif *ifp, ip_addr_t *addr)
|
| mbed714 |
0:d616ece2d859
|
318
|
{
|
| mbed714 |
0:d616ece2d859
|
319
|
struct igmp_group *group = igmp_group_list;
|
| mbed714 |
0:d616ece2d859
|
320
|
|
| mbed714 |
0:d616ece2d859
|
321
|
/* Search if the group already exists */
|
| mbed714 |
0:d616ece2d859
|
322
|
group = igmp_lookfor_group(ifp, addr);
|
| mbed714 |
0:d616ece2d859
|
323
|
if (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
324
|
/* Group already exists. */
|
| mbed714 |
0:d616ece2d859
|
325
|
return group;
|
| mbed714 |
0:d616ece2d859
|
326
|
}
|
| mbed714 |
0:d616ece2d859
|
327
|
|
| mbed714 |
0:d616ece2d859
|
328
|
/* Group doesn't exist yet, create a new one */
|
| mbed714 |
0:d616ece2d859
|
329
|
group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
|
| mbed714 |
0:d616ece2d859
|
330
|
if (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
331
|
group->netif = ifp;
|
| mbed714 |
0:d616ece2d859
|
332
|
ip_addr_set(&(group->group_address), addr);
|
| mbed714 |
0:d616ece2d859
|
333
|
group->timer = 0; /* Not running */
|
| mbed714 |
0:d616ece2d859
|
334
|
group->group_state = IGMP_GROUP_NON_MEMBER;
|
| mbed714 |
0:d616ece2d859
|
335
|
group->last_reporter_flag = 0;
|
| mbed714 |
0:d616ece2d859
|
336
|
group->use = 0;
|
| mbed714 |
0:d616ece2d859
|
337
|
group->next = igmp_group_list;
|
| mbed714 |
0:d616ece2d859
|
338
|
|
| mbed714 |
0:d616ece2d859
|
339
|
igmp_group_list = group;
|
| mbed714 |
0:d616ece2d859
|
340
|
}
|
| mbed714 |
0:d616ece2d859
|
341
|
|
| mbed714 |
0:d616ece2d859
|
342
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
|
| mbed714 |
0:d616ece2d859
|
343
|
ip_addr_debug_print(IGMP_DEBUG, addr);
|
| mbed714 |
0:d616ece2d859
|
344
|
LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
|
| mbed714 |
0:d616ece2d859
|
345
|
|
| mbed714 |
0:d616ece2d859
|
346
|
return group;
|
| mbed714 |
0:d616ece2d859
|
347
|
}
|
| mbed714 |
0:d616ece2d859
|
348
|
|
| mbed714 |
0:d616ece2d859
|
349
|
/**
|
| mbed714 |
0:d616ece2d859
|
350
|
* Remove a group in the global igmp_group_list
|
| mbed714 |
0:d616ece2d859
|
351
|
*
|
| mbed714 |
0:d616ece2d859
|
352
|
* @param group the group to remove from the global igmp_group_list
|
| mbed714 |
0:d616ece2d859
|
353
|
* @return ERR_OK if group was removed from the list, an err_t otherwise
|
| mbed714 |
0:d616ece2d859
|
354
|
*/
|
| mbed714 |
0:d616ece2d859
|
355
|
static err_t
|
| mbed714 |
0:d616ece2d859
|
356
|
igmp_remove_group(struct igmp_group *group)
|
| mbed714 |
0:d616ece2d859
|
357
|
{
|
| mbed714 |
0:d616ece2d859
|
358
|
err_t err = ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
359
|
|
| mbed714 |
0:d616ece2d859
|
360
|
/* Is it the first group? */
|
| mbed714 |
0:d616ece2d859
|
361
|
if (igmp_group_list == group) {
|
| mbed714 |
0:d616ece2d859
|
362
|
igmp_group_list = group->next;
|
| mbed714 |
0:d616ece2d859
|
363
|
} else {
|
| mbed714 |
0:d616ece2d859
|
364
|
/* look for group further down the list */
|
| mbed714 |
0:d616ece2d859
|
365
|
struct igmp_group *tmpGroup;
|
| mbed714 |
0:d616ece2d859
|
366
|
for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
|
| mbed714 |
0:d616ece2d859
|
367
|
if (tmpGroup->next == group) {
|
| mbed714 |
0:d616ece2d859
|
368
|
tmpGroup->next = group->next;
|
| mbed714 |
0:d616ece2d859
|
369
|
break;
|
| mbed714 |
0:d616ece2d859
|
370
|
}
|
| mbed714 |
0:d616ece2d859
|
371
|
}
|
| mbed714 |
0:d616ece2d859
|
372
|
/* Group not found in the global igmp_group_list */
|
| mbed714 |
0:d616ece2d859
|
373
|
if (tmpGroup == NULL)
|
| mbed714 |
0:d616ece2d859
|
374
|
err = ERR_ARG;
|
| mbed714 |
0:d616ece2d859
|
375
|
}
|
| mbed714 |
0:d616ece2d859
|
376
|
/* free group */
|
| mbed714 |
0:d616ece2d859
|
377
|
memp_free(MEMP_IGMP_GROUP, group);
|
| mbed714 |
0:d616ece2d859
|
378
|
|
| mbed714 |
0:d616ece2d859
|
379
|
return err;
|
| mbed714 |
0:d616ece2d859
|
380
|
}
|
| mbed714 |
0:d616ece2d859
|
381
|
|
| mbed714 |
0:d616ece2d859
|
382
|
/**
|
| mbed714 |
0:d616ece2d859
|
383
|
* Called from ip_input() if a new IGMP packet is received.
|
| mbed714 |
0:d616ece2d859
|
384
|
*
|
| mbed714 |
0:d616ece2d859
|
385
|
* @param p received igmp packet, p->payload pointing to the ip header
|
| mbed714 |
0:d616ece2d859
|
386
|
* @param inp network interface on which the packet was received
|
| mbed714 |
0:d616ece2d859
|
387
|
* @param dest destination ip address of the igmp packet
|
| mbed714 |
0:d616ece2d859
|
388
|
*/
|
| mbed714 |
0:d616ece2d859
|
389
|
void
|
| mbed714 |
0:d616ece2d859
|
390
|
igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest)
|
| mbed714 |
0:d616ece2d859
|
391
|
{
|
| mbed714 |
0:d616ece2d859
|
392
|
struct ip_hdr * iphdr;
|
| mbed714 |
0:d616ece2d859
|
393
|
struct igmp_msg* igmp;
|
| mbed714 |
0:d616ece2d859
|
394
|
struct igmp_group* group;
|
| mbed714 |
0:d616ece2d859
|
395
|
struct igmp_group* groupref;
|
| mbed714 |
0:d616ece2d859
|
396
|
|
| mbed714 |
0:d616ece2d859
|
397
|
IGMP_STATS_INC(igmp.recv);
|
| mbed714 |
0:d616ece2d859
|
398
|
|
| mbed714 |
0:d616ece2d859
|
399
|
/* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
|
| mbed714 |
0:d616ece2d859
|
400
|
iphdr = (struct ip_hdr *)p->payload;
|
| mbed714 |
0:d616ece2d859
|
401
|
if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
|
| mbed714 |
0:d616ece2d859
|
402
|
pbuf_free(p);
|
| mbed714 |
0:d616ece2d859
|
403
|
IGMP_STATS_INC(igmp.lenerr);
|
| mbed714 |
0:d616ece2d859
|
404
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
|
| mbed714 |
0:d616ece2d859
|
405
|
return;
|
| mbed714 |
0:d616ece2d859
|
406
|
}
|
| mbed714 |
0:d616ece2d859
|
407
|
|
| mbed714 |
0:d616ece2d859
|
408
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
|
| mbed714 |
0:d616ece2d859
|
409
|
ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
|
| mbed714 |
0:d616ece2d859
|
410
|
LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
|
| mbed714 |
0:d616ece2d859
|
411
|
ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
|
| mbed714 |
0:d616ece2d859
|
412
|
LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
|
| mbed714 |
0:d616ece2d859
|
413
|
|
| mbed714 |
0:d616ece2d859
|
414
|
/* Now calculate and check the checksum */
|
| mbed714 |
0:d616ece2d859
|
415
|
igmp = (struct igmp_msg *)p->payload;
|
| mbed714 |
0:d616ece2d859
|
416
|
if (inet_chksum(igmp, p->len)) {
|
| mbed714 |
0:d616ece2d859
|
417
|
pbuf_free(p);
|
| mbed714 |
0:d616ece2d859
|
418
|
IGMP_STATS_INC(igmp.chkerr);
|
| mbed714 |
0:d616ece2d859
|
419
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
|
| mbed714 |
0:d616ece2d859
|
420
|
return;
|
| mbed714 |
0:d616ece2d859
|
421
|
}
|
| mbed714 |
0:d616ece2d859
|
422
|
|
| mbed714 |
0:d616ece2d859
|
423
|
/* Packet is ok so find an existing group */
|
| mbed714 |
0:d616ece2d859
|
424
|
group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
|
| mbed714 |
0:d616ece2d859
|
425
|
|
| mbed714 |
0:d616ece2d859
|
426
|
/* If group can be found or create... */
|
| mbed714 |
0:d616ece2d859
|
427
|
if (!group) {
|
| mbed714 |
0:d616ece2d859
|
428
|
pbuf_free(p);
|
| mbed714 |
0:d616ece2d859
|
429
|
IGMP_STATS_INC(igmp.drop);
|
| mbed714 |
0:d616ece2d859
|
430
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
|
| mbed714 |
0:d616ece2d859
|
431
|
return;
|
| mbed714 |
0:d616ece2d859
|
432
|
}
|
| mbed714 |
0:d616ece2d859
|
433
|
|
| mbed714 |
0:d616ece2d859
|
434
|
/* NOW ACT ON THE INCOMING MESSAGE TYPE... */
|
| mbed714 |
0:d616ece2d859
|
435
|
switch (igmp->igmp_msgtype) {
|
| mbed714 |
0:d616ece2d859
|
436
|
case IGMP_MEMB_QUERY: {
|
| mbed714 |
0:d616ece2d859
|
437
|
/* IGMP_MEMB_QUERY to the "all systems" address ? */
|
| mbed714 |
0:d616ece2d859
|
438
|
if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
|
| mbed714 |
0:d616ece2d859
|
439
|
/* THIS IS THE GENERAL QUERY */
|
| mbed714 |
0:d616ece2d859
|
440
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
|
| mbed714 |
0:d616ece2d859
|
441
|
|
| mbed714 |
0:d616ece2d859
|
442
|
if (igmp->igmp_maxresp == 0) {
|
| mbed714 |
0:d616ece2d859
|
443
|
IGMP_STATS_INC(igmp.rx_v1);
|
| mbed714 |
0:d616ece2d859
|
444
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
|
| mbed714 |
0:d616ece2d859
|
445
|
igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
|
| mbed714 |
0:d616ece2d859
|
446
|
} else {
|
| mbed714 |
0:d616ece2d859
|
447
|
IGMP_STATS_INC(igmp.rx_general);
|
| mbed714 |
0:d616ece2d859
|
448
|
}
|
| mbed714 |
0:d616ece2d859
|
449
|
|
| mbed714 |
0:d616ece2d859
|
450
|
groupref = igmp_group_list;
|
| mbed714 |
0:d616ece2d859
|
451
|
while (groupref) {
|
| mbed714 |
0:d616ece2d859
|
452
|
/* Do not send messages on the all systems group address! */
|
| mbed714 |
0:d616ece2d859
|
453
|
if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
|
| mbed714 |
0:d616ece2d859
|
454
|
igmp_delaying_member(groupref, igmp->igmp_maxresp);
|
| mbed714 |
0:d616ece2d859
|
455
|
}
|
| mbed714 |
0:d616ece2d859
|
456
|
groupref = groupref->next;
|
| mbed714 |
0:d616ece2d859
|
457
|
}
|
| mbed714 |
0:d616ece2d859
|
458
|
} else {
|
| mbed714 |
0:d616ece2d859
|
459
|
/* IGMP_MEMB_QUERY to a specific group ? */
|
| mbed714 |
0:d616ece2d859
|
460
|
if (!ip_addr_isany(&igmp->igmp_group_address)) {
|
| mbed714 |
0:d616ece2d859
|
461
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
|
| mbed714 |
0:d616ece2d859
|
462
|
ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
|
| mbed714 |
0:d616ece2d859
|
463
|
if (ip_addr_cmp(dest, &allsystems)) {
|
| mbed714 |
0:d616ece2d859
|
464
|
ip_addr_t groupaddr;
|
| mbed714 |
0:d616ece2d859
|
465
|
LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
|
| mbed714 |
0:d616ece2d859
|
466
|
/* we first need to re-look for the group since we used dest last time */
|
| mbed714 |
0:d616ece2d859
|
467
|
ip_addr_copy(groupaddr, igmp->igmp_group_address);
|
| mbed714 |
0:d616ece2d859
|
468
|
group = igmp_lookfor_group(inp, &groupaddr);
|
| mbed714 |
0:d616ece2d859
|
469
|
} else {
|
| mbed714 |
0:d616ece2d859
|
470
|
LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
|
| mbed714 |
0:d616ece2d859
|
471
|
}
|
| mbed714 |
0:d616ece2d859
|
472
|
|
| mbed714 |
0:d616ece2d859
|
473
|
if (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
474
|
IGMP_STATS_INC(igmp.rx_group);
|
| mbed714 |
0:d616ece2d859
|
475
|
igmp_delaying_member(group, igmp->igmp_maxresp);
|
| mbed714 |
0:d616ece2d859
|
476
|
} else {
|
| mbed714 |
0:d616ece2d859
|
477
|
IGMP_STATS_INC(igmp.drop);
|
| mbed714 |
0:d616ece2d859
|
478
|
}
|
| mbed714 |
0:d616ece2d859
|
479
|
} else {
|
| mbed714 |
0:d616ece2d859
|
480
|
IGMP_STATS_INC(igmp.proterr);
|
| mbed714 |
0:d616ece2d859
|
481
|
}
|
| mbed714 |
0:d616ece2d859
|
482
|
}
|
| mbed714 |
0:d616ece2d859
|
483
|
break;
|
| mbed714 |
0:d616ece2d859
|
484
|
}
|
| mbed714 |
0:d616ece2d859
|
485
|
case IGMP_V2_MEMB_REPORT: {
|
| mbed714 |
0:d616ece2d859
|
486
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
|
| mbed714 |
0:d616ece2d859
|
487
|
IGMP_STATS_INC(igmp.rx_report);
|
| mbed714 |
0:d616ece2d859
|
488
|
if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
|
| mbed714 |
0:d616ece2d859
|
489
|
/* This is on a specific group we have already looked up */
|
| mbed714 |
0:d616ece2d859
|
490
|
group->timer = 0; /* stopped */
|
| mbed714 |
0:d616ece2d859
|
491
|
group->group_state = IGMP_GROUP_IDLE_MEMBER;
|
| mbed714 |
0:d616ece2d859
|
492
|
group->last_reporter_flag = 0;
|
| mbed714 |
0:d616ece2d859
|
493
|
}
|
| mbed714 |
0:d616ece2d859
|
494
|
break;
|
| mbed714 |
0:d616ece2d859
|
495
|
}
|
| mbed714 |
0:d616ece2d859
|
496
|
default: {
|
| mbed714 |
0:d616ece2d859
|
497
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
|
| mbed714 |
0:d616ece2d859
|
498
|
igmp->igmp_msgtype, group->group_state, &group, group->netif));
|
| mbed714 |
0:d616ece2d859
|
499
|
IGMP_STATS_INC(igmp.proterr);
|
| mbed714 |
0:d616ece2d859
|
500
|
break;
|
| mbed714 |
0:d616ece2d859
|
501
|
}
|
| mbed714 |
0:d616ece2d859
|
502
|
}
|
| mbed714 |
0:d616ece2d859
|
503
|
|
| mbed714 |
0:d616ece2d859
|
504
|
pbuf_free(p);
|
| mbed714 |
0:d616ece2d859
|
505
|
return;
|
| mbed714 |
0:d616ece2d859
|
506
|
}
|
| mbed714 |
0:d616ece2d859
|
507
|
|
| mbed714 |
0:d616ece2d859
|
508
|
/**
|
| mbed714 |
0:d616ece2d859
|
509
|
* Join a group on one network interface.
|
| mbed714 |
0:d616ece2d859
|
510
|
*
|
| mbed714 |
0:d616ece2d859
|
511
|
* @param ifaddr ip address of the network interface which should join a new group
|
| mbed714 |
0:d616ece2d859
|
512
|
* @param groupaddr the ip address of the group which to join
|
| mbed714 |
0:d616ece2d859
|
513
|
* @return ERR_OK if group was joined on the netif(s), an err_t otherwise
|
| mbed714 |
0:d616ece2d859
|
514
|
*/
|
| mbed714 |
0:d616ece2d859
|
515
|
err_t
|
| mbed714 |
0:d616ece2d859
|
516
|
igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
|
| mbed714 |
0:d616ece2d859
|
517
|
{
|
| mbed714 |
0:d616ece2d859
|
518
|
err_t err = ERR_VAL; /* no matching interface */
|
| mbed714 |
0:d616ece2d859
|
519
|
struct igmp_group *group;
|
| mbed714 |
0:d616ece2d859
|
520
|
struct netif *netif;
|
| mbed714 |
0:d616ece2d859
|
521
|
|
| mbed714 |
0:d616ece2d859
|
522
|
/* make sure it is multicast address */
|
| mbed714 |
0:d616ece2d859
|
523
|
LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
|
| mbed714 |
0:d616ece2d859
|
524
|
LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
|
| mbed714 |
0:d616ece2d859
|
525
|
|
| mbed714 |
0:d616ece2d859
|
526
|
/* loop through netif's */
|
| mbed714 |
0:d616ece2d859
|
527
|
netif = netif_list;
|
| mbed714 |
0:d616ece2d859
|
528
|
while (netif != NULL) {
|
| mbed714 |
0:d616ece2d859
|
529
|
/* Should we join this interface ? */
|
| mbed714 |
0:d616ece2d859
|
530
|
if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
|
| mbed714 |
0:d616ece2d859
|
531
|
/* find group or create a new one if not found */
|
| mbed714 |
0:d616ece2d859
|
532
|
group = igmp_lookup_group(netif, groupaddr);
|
| mbed714 |
0:d616ece2d859
|
533
|
|
| mbed714 |
0:d616ece2d859
|
534
|
if (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
535
|
/* This should create a new group, check the state to make sure */
|
| mbed714 |
0:d616ece2d859
|
536
|
if (group->group_state != IGMP_GROUP_NON_MEMBER) {
|
| mbed714 |
0:d616ece2d859
|
537
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
|
| mbed714 |
0:d616ece2d859
|
538
|
} else {
|
| mbed714 |
0:d616ece2d859
|
539
|
/* OK - it was new group */
|
| mbed714 |
0:d616ece2d859
|
540
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
|
| mbed714 |
0:d616ece2d859
|
541
|
ip_addr_debug_print(IGMP_DEBUG, groupaddr);
|
| mbed714 |
0:d616ece2d859
|
542
|
LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
|
| mbed714 |
0:d616ece2d859
|
543
|
|
| mbed714 |
0:d616ece2d859
|
544
|
/* If first use of the group, allow the group at the MAC level */
|
| mbed714 |
0:d616ece2d859
|
545
|
if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
|
| mbed714 |
0:d616ece2d859
|
546
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
|
| mbed714 |
0:d616ece2d859
|
547
|
ip_addr_debug_print(IGMP_DEBUG, groupaddr);
|
| mbed714 |
0:d616ece2d859
|
548
|
LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
|
| mbed714 |
0:d616ece2d859
|
549
|
netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
|
| mbed714 |
0:d616ece2d859
|
550
|
}
|
| mbed714 |
0:d616ece2d859
|
551
|
|
| mbed714 |
0:d616ece2d859
|
552
|
IGMP_STATS_INC(igmp.tx_join);
|
| mbed714 |
0:d616ece2d859
|
553
|
igmp_send(group, IGMP_V2_MEMB_REPORT);
|
| mbed714 |
0:d616ece2d859
|
554
|
|
| mbed714 |
0:d616ece2d859
|
555
|
igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
|
| mbed714 |
0:d616ece2d859
|
556
|
|
| mbed714 |
0:d616ece2d859
|
557
|
/* Need to work out where this timer comes from */
|
| mbed714 |
0:d616ece2d859
|
558
|
group->group_state = IGMP_GROUP_DELAYING_MEMBER;
|
| mbed714 |
0:d616ece2d859
|
559
|
}
|
| mbed714 |
0:d616ece2d859
|
560
|
/* Increment group use */
|
| mbed714 |
0:d616ece2d859
|
561
|
group->use++;
|
| mbed714 |
0:d616ece2d859
|
562
|
/* Join on this interface */
|
| mbed714 |
0:d616ece2d859
|
563
|
err = ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
564
|
} else {
|
| mbed714 |
0:d616ece2d859
|
565
|
/* Return an error even if some network interfaces are joined */
|
| mbed714 |
0:d616ece2d859
|
566
|
/** @todo undo any other netif already joined */
|
| mbed714 |
0:d616ece2d859
|
567
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
|
| mbed714 |
0:d616ece2d859
|
568
|
return ERR_MEM;
|
| mbed714 |
0:d616ece2d859
|
569
|
}
|
| mbed714 |
0:d616ece2d859
|
570
|
}
|
| mbed714 |
0:d616ece2d859
|
571
|
/* proceed to next network interface */
|
| mbed714 |
0:d616ece2d859
|
572
|
netif = netif->next;
|
| mbed714 |
0:d616ece2d859
|
573
|
}
|
| mbed714 |
0:d616ece2d859
|
574
|
|
| mbed714 |
0:d616ece2d859
|
575
|
return err;
|
| mbed714 |
0:d616ece2d859
|
576
|
}
|
| mbed714 |
0:d616ece2d859
|
577
|
|
| mbed714 |
0:d616ece2d859
|
578
|
/**
|
| mbed714 |
0:d616ece2d859
|
579
|
* Leave a group on one network interface.
|
| mbed714 |
0:d616ece2d859
|
580
|
*
|
| mbed714 |
0:d616ece2d859
|
581
|
* @param ifaddr ip address of the network interface which should leave a group
|
| mbed714 |
0:d616ece2d859
|
582
|
* @param groupaddr the ip address of the group which to leave
|
| mbed714 |
0:d616ece2d859
|
583
|
* @return ERR_OK if group was left on the netif(s), an err_t otherwise
|
| mbed714 |
0:d616ece2d859
|
584
|
*/
|
| mbed714 |
0:d616ece2d859
|
585
|
err_t
|
| mbed714 |
0:d616ece2d859
|
586
|
igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
|
| mbed714 |
0:d616ece2d859
|
587
|
{
|
| mbed714 |
0:d616ece2d859
|
588
|
err_t err = ERR_VAL; /* no matching interface */
|
| mbed714 |
0:d616ece2d859
|
589
|
struct igmp_group *group;
|
| mbed714 |
0:d616ece2d859
|
590
|
struct netif *netif;
|
| mbed714 |
0:d616ece2d859
|
591
|
|
| mbed714 |
0:d616ece2d859
|
592
|
/* make sure it is multicast address */
|
| mbed714 |
0:d616ece2d859
|
593
|
LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
|
| mbed714 |
0:d616ece2d859
|
594
|
LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
|
| mbed714 |
0:d616ece2d859
|
595
|
|
| mbed714 |
0:d616ece2d859
|
596
|
/* loop through netif's */
|
| mbed714 |
0:d616ece2d859
|
597
|
netif = netif_list;
|
| mbed714 |
0:d616ece2d859
|
598
|
while (netif != NULL) {
|
| mbed714 |
0:d616ece2d859
|
599
|
/* Should we leave this interface ? */
|
| mbed714 |
0:d616ece2d859
|
600
|
if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
|
| mbed714 |
0:d616ece2d859
|
601
|
/* find group */
|
| mbed714 |
0:d616ece2d859
|
602
|
group = igmp_lookfor_group(netif, groupaddr);
|
| mbed714 |
0:d616ece2d859
|
603
|
|
| mbed714 |
0:d616ece2d859
|
604
|
if (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
605
|
/* Only send a leave if the flag is set according to the state diagram */
|
| mbed714 |
0:d616ece2d859
|
606
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
|
| mbed714 |
0:d616ece2d859
|
607
|
ip_addr_debug_print(IGMP_DEBUG, groupaddr);
|
| mbed714 |
0:d616ece2d859
|
608
|
LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
|
| mbed714 |
0:d616ece2d859
|
609
|
|
| mbed714 |
0:d616ece2d859
|
610
|
/* If there is no other use of the group */
|
| mbed714 |
0:d616ece2d859
|
611
|
if (group->use <= 1) {
|
| mbed714 |
0:d616ece2d859
|
612
|
/* If we are the last reporter for this group */
|
| mbed714 |
0:d616ece2d859
|
613
|
if (group->last_reporter_flag) {
|
| mbed714 |
0:d616ece2d859
|
614
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
|
| mbed714 |
0:d616ece2d859
|
615
|
IGMP_STATS_INC(igmp.tx_leave);
|
| mbed714 |
0:d616ece2d859
|
616
|
igmp_send(group, IGMP_LEAVE_GROUP);
|
| mbed714 |
0:d616ece2d859
|
617
|
}
|
| mbed714 |
0:d616ece2d859
|
618
|
|
| mbed714 |
0:d616ece2d859
|
619
|
/* Disable the group at the MAC level */
|
| mbed714 |
0:d616ece2d859
|
620
|
if (netif->igmp_mac_filter != NULL) {
|
| mbed714 |
0:d616ece2d859
|
621
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
|
| mbed714 |
0:d616ece2d859
|
622
|
ip_addr_debug_print(IGMP_DEBUG, groupaddr);
|
| mbed714 |
0:d616ece2d859
|
623
|
LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
|
| mbed714 |
0:d616ece2d859
|
624
|
netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
|
| mbed714 |
0:d616ece2d859
|
625
|
}
|
| mbed714 |
0:d616ece2d859
|
626
|
|
| mbed714 |
0:d616ece2d859
|
627
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
|
| mbed714 |
0:d616ece2d859
|
628
|
ip_addr_debug_print(IGMP_DEBUG, groupaddr);
|
| mbed714 |
0:d616ece2d859
|
629
|
LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
|
| mbed714 |
0:d616ece2d859
|
630
|
|
| mbed714 |
0:d616ece2d859
|
631
|
/* Free the group */
|
| mbed714 |
0:d616ece2d859
|
632
|
igmp_remove_group(group);
|
| mbed714 |
0:d616ece2d859
|
633
|
} else {
|
| mbed714 |
0:d616ece2d859
|
634
|
/* Decrement group use */
|
| mbed714 |
0:d616ece2d859
|
635
|
group->use--;
|
| mbed714 |
0:d616ece2d859
|
636
|
}
|
| mbed714 |
0:d616ece2d859
|
637
|
/* Leave on this interface */
|
| mbed714 |
0:d616ece2d859
|
638
|
err = ERR_OK;
|
| mbed714 |
0:d616ece2d859
|
639
|
} else {
|
| mbed714 |
0:d616ece2d859
|
640
|
/* It's not a fatal error on "leavegroup" */
|
| mbed714 |
0:d616ece2d859
|
641
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
|
| mbed714 |
0:d616ece2d859
|
642
|
}
|
| mbed714 |
0:d616ece2d859
|
643
|
}
|
| mbed714 |
0:d616ece2d859
|
644
|
/* proceed to next network interface */
|
| mbed714 |
0:d616ece2d859
|
645
|
netif = netif->next;
|
| mbed714 |
0:d616ece2d859
|
646
|
}
|
| mbed714 |
0:d616ece2d859
|
647
|
|
| mbed714 |
0:d616ece2d859
|
648
|
return err;
|
| mbed714 |
0:d616ece2d859
|
649
|
}
|
| mbed714 |
0:d616ece2d859
|
650
|
|
| mbed714 |
0:d616ece2d859
|
651
|
/**
|
| mbed714 |
0:d616ece2d859
|
652
|
* The igmp timer function (both for NO_SYS=1 and =0)
|
| mbed714 |
0:d616ece2d859
|
653
|
* Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
|
| mbed714 |
0:d616ece2d859
|
654
|
*/
|
| mbed714 |
0:d616ece2d859
|
655
|
void
|
| mbed714 |
0:d616ece2d859
|
656
|
igmp_tmr(void)
|
| mbed714 |
0:d616ece2d859
|
657
|
{
|
| mbed714 |
0:d616ece2d859
|
658
|
struct igmp_group *group = igmp_group_list;
|
| mbed714 |
0:d616ece2d859
|
659
|
|
| mbed714 |
0:d616ece2d859
|
660
|
while (group != NULL) {
|
| mbed714 |
0:d616ece2d859
|
661
|
if (group->timer > 0) {
|
| mbed714 |
0:d616ece2d859
|
662
|
group->timer--;
|
| mbed714 |
0:d616ece2d859
|
663
|
if (group->timer == 0) {
|
| mbed714 |
0:d616ece2d859
|
664
|
igmp_timeout(group);
|
| mbed714 |
0:d616ece2d859
|
665
|
}
|
| mbed714 |
0:d616ece2d859
|
666
|
}
|
| mbed714 |
0:d616ece2d859
|
667
|
group = group->next;
|
| mbed714 |
0:d616ece2d859
|
668
|
}
|
| mbed714 |
0:d616ece2d859
|
669
|
}
|
| mbed714 |
0:d616ece2d859
|
670
|
|
| mbed714 |
0:d616ece2d859
|
671
|
/**
|
| mbed714 |
0:d616ece2d859
|
672
|
* Called if a timeout for one group is reached.
|
| mbed714 |
0:d616ece2d859
|
673
|
* Sends a report for this group.
|
| mbed714 |
0:d616ece2d859
|
674
|
*
|
| mbed714 |
0:d616ece2d859
|
675
|
* @param group an igmp_group for which a timeout is reached
|
| mbed714 |
0:d616ece2d859
|
676
|
*/
|
| mbed714 |
0:d616ece2d859
|
677
|
static void
|
| mbed714 |
0:d616ece2d859
|
678
|
igmp_timeout(struct igmp_group *group)
|
| mbed714 |
0:d616ece2d859
|
679
|
{
|
| mbed714 |
0:d616ece2d859
|
680
|
/* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
|
| mbed714 |
0:d616ece2d859
|
681
|
if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
|
| mbed714 |
0:d616ece2d859
|
682
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
|
| mbed714 |
0:d616ece2d859
|
683
|
ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
|
| mbed714 |
0:d616ece2d859
|
684
|
LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
|
| mbed714 |
0:d616ece2d859
|
685
|
|
| mbed714 |
0:d616ece2d859
|
686
|
IGMP_STATS_INC(igmp.tx_report);
|
| mbed714 |
0:d616ece2d859
|
687
|
igmp_send(group, IGMP_V2_MEMB_REPORT);
|
| mbed714 |
0:d616ece2d859
|
688
|
}
|
| mbed714 |
0:d616ece2d859
|
689
|
}
|
| mbed714 |
0:d616ece2d859
|
690
|
|
| mbed714 |
0:d616ece2d859
|
691
|
/**
|
| mbed714 |
0:d616ece2d859
|
692
|
* Start a timer for an igmp group
|
| mbed714 |
0:d616ece2d859
|
693
|
*
|
| mbed714 |
0:d616ece2d859
|
694
|
* @param group the igmp_group for which to start a timer
|
| mbed714 |
0:d616ece2d859
|
695
|
* @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
|
| mbed714 |
0:d616ece2d859
|
696
|
* every call to igmp_tmr())
|
| mbed714 |
0:d616ece2d859
|
697
|
*/
|
| mbed714 |
0:d616ece2d859
|
698
|
static void
|
| mbed714 |
0:d616ece2d859
|
699
|
igmp_start_timer(struct igmp_group *group, u8_t max_time)
|
| mbed714 |
0:d616ece2d859
|
700
|
{
|
| mbed714 |
0:d616ece2d859
|
701
|
/* ensure the input value is > 0 */
|
| mbed714 |
0:d616ece2d859
|
702
|
if (max_time == 0) {
|
| mbed714 |
0:d616ece2d859
|
703
|
max_time = 1;
|
| mbed714 |
0:d616ece2d859
|
704
|
}
|
| mbed714 |
0:d616ece2d859
|
705
|
/* ensure the random value is > 0 */
|
| mbed714 |
0:d616ece2d859
|
706
|
group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
|
| mbed714 |
0:d616ece2d859
|
707
|
}
|
| mbed714 |
0:d616ece2d859
|
708
|
|
| mbed714 |
0:d616ece2d859
|
709
|
/**
|
| mbed714 |
0:d616ece2d859
|
710
|
* Stop a timer for an igmp_group
|
| mbed714 |
0:d616ece2d859
|
711
|
*
|
| mbed714 |
0:d616ece2d859
|
712
|
* @param group the igmp_group for which to stop the timer
|
| mbed714 |
0:d616ece2d859
|
713
|
*/
|
| mbed714 |
0:d616ece2d859
|
714
|
static void
|
| mbed714 |
0:d616ece2d859
|
715
|
igmp_stop_timer(struct igmp_group *group)
|
| mbed714 |
0:d616ece2d859
|
716
|
{
|
| mbed714 |
0:d616ece2d859
|
717
|
group->timer = 0;
|
| mbed714 |
0:d616ece2d859
|
718
|
}
|
| mbed714 |
0:d616ece2d859
|
719
|
|
| mbed714 |
0:d616ece2d859
|
720
|
/**
|
| mbed714 |
0:d616ece2d859
|
721
|
* Delaying membership report for a group if necessary
|
| mbed714 |
0:d616ece2d859
|
722
|
*
|
| mbed714 |
0:d616ece2d859
|
723
|
* @param group the igmp_group for which "delaying" membership report
|
| mbed714 |
0:d616ece2d859
|
724
|
* @param maxresp query delay
|
| mbed714 |
0:d616ece2d859
|
725
|
*/
|
| mbed714 |
0:d616ece2d859
|
726
|
static void
|
| mbed714 |
0:d616ece2d859
|
727
|
igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
|
| mbed714 |
0:d616ece2d859
|
728
|
{
|
| mbed714 |
0:d616ece2d859
|
729
|
if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
|
| mbed714 |
0:d616ece2d859
|
730
|
((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
|
| mbed714 |
0:d616ece2d859
|
731
|
((group->timer == 0) || (maxresp < group->timer)))) {
|
| mbed714 |
0:d616ece2d859
|
732
|
igmp_start_timer(group, maxresp);
|
| mbed714 |
0:d616ece2d859
|
733
|
group->group_state = IGMP_GROUP_DELAYING_MEMBER;
|
| mbed714 |
0:d616ece2d859
|
734
|
}
|
| mbed714 |
0:d616ece2d859
|
735
|
}
|
| mbed714 |
0:d616ece2d859
|
736
|
|
| mbed714 |
0:d616ece2d859
|
737
|
|
| mbed714 |
0:d616ece2d859
|
738
|
/**
|
| mbed714 |
0:d616ece2d859
|
739
|
* Sends an IP packet on a network interface. This function constructs the IP header
|
| mbed714 |
0:d616ece2d859
|
740
|
* and calculates the IP header checksum. If the source IP address is NULL,
|
| mbed714 |
0:d616ece2d859
|
741
|
* the IP address of the outgoing network interface is filled in as source address.
|
| mbed714 |
0:d616ece2d859
|
742
|
*
|
| mbed714 |
0:d616ece2d859
|
743
|
* @param p the packet to send (p->payload points to the data, e.g. next
|
| mbed714 |
0:d616ece2d859
|
744
|
protocol header; if dest == IP_HDRINCL, p already includes an IP
|
| mbed714 |
0:d616ece2d859
|
745
|
header and p->payload points to that IP header)
|
| mbed714 |
0:d616ece2d859
|
746
|
* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
|
| mbed714 |
0:d616ece2d859
|
747
|
* IP address of the netif used to send is used as source address)
|
| mbed714 |
0:d616ece2d859
|
748
|
* @param dest the destination IP address to send the packet to
|
| mbed714 |
0:d616ece2d859
|
749
|
* @param ttl the TTL value to be set in the IP header
|
| mbed714 |
0:d616ece2d859
|
750
|
* @param proto the PROTOCOL to be set in the IP header
|
| mbed714 |
0:d616ece2d859
|
751
|
* @param netif the netif on which to send this packet
|
| mbed714 |
0:d616ece2d859
|
752
|
* @return ERR_OK if the packet was sent OK
|
| mbed714 |
0:d616ece2d859
|
753
|
* ERR_BUF if p doesn't have enough space for IP/LINK headers
|
| mbed714 |
0:d616ece2d859
|
754
|
* returns errors returned by netif->output
|
| mbed714 |
0:d616ece2d859
|
755
|
*/
|
| mbed714 |
0:d616ece2d859
|
756
|
static err_t
|
| mbed714 |
0:d616ece2d859
|
757
|
igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif)
|
| mbed714 |
0:d616ece2d859
|
758
|
{
|
| mbed714 |
0:d616ece2d859
|
759
|
/* This is the "router alert" option */
|
| mbed714 |
0:d616ece2d859
|
760
|
u16_t ra[2];
|
| mbed714 |
0:d616ece2d859
|
761
|
ra[0] = PP_HTONS(ROUTER_ALERT);
|
| mbed714 |
0:d616ece2d859
|
762
|
ra[1] = 0x0000; /* Router shall examine packet */
|
| mbed714 |
0:d616ece2d859
|
763
|
IGMP_STATS_INC(igmp.xmit);
|
| mbed714 |
0:d616ece2d859
|
764
|
return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
|
| mbed714 |
0:d616ece2d859
|
765
|
}
|
| mbed714 |
0:d616ece2d859
|
766
|
|
| mbed714 |
0:d616ece2d859
|
767
|
/**
|
| mbed714 |
0:d616ece2d859
|
768
|
* Send an igmp packet to a specific group.
|
| mbed714 |
0:d616ece2d859
|
769
|
*
|
| mbed714 |
0:d616ece2d859
|
770
|
* @param group the group to which to send the packet
|
| mbed714 |
0:d616ece2d859
|
771
|
* @param type the type of igmp packet to send
|
| mbed714 |
0:d616ece2d859
|
772
|
*/
|
| mbed714 |
0:d616ece2d859
|
773
|
static void
|
| mbed714 |
0:d616ece2d859
|
774
|
igmp_send(struct igmp_group *group, u8_t type)
|
| mbed714 |
0:d616ece2d859
|
775
|
{
|
| mbed714 |
0:d616ece2d859
|
776
|
struct pbuf* p = NULL;
|
| mbed714 |
0:d616ece2d859
|
777
|
struct igmp_msg* igmp = NULL;
|
| mbed714 |
0:d616ece2d859
|
778
|
ip_addr_t src = *IP_ADDR_ANY;
|
| mbed714 |
0:d616ece2d859
|
779
|
ip_addr_t* dest = NULL;
|
| mbed714 |
0:d616ece2d859
|
780
|
|
| mbed714 |
0:d616ece2d859
|
781
|
/* IP header + "router alert" option + IGMP header */
|
| mbed714 |
0:d616ece2d859
|
782
|
p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
|
| mbed714 |
0:d616ece2d859
|
783
|
|
| mbed714 |
0:d616ece2d859
|
784
|
if (p) {
|
| mbed714 |
0:d616ece2d859
|
785
|
igmp = (struct igmp_msg *)p->payload;
|
| mbed714 |
0:d616ece2d859
|
786
|
LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
|
| mbed714 |
0:d616ece2d859
|
787
|
(p->len >= sizeof(struct igmp_msg)));
|
| mbed714 |
0:d616ece2d859
|
788
|
ip_addr_copy(src, group->netif->ip_addr);
|
| mbed714 |
0:d616ece2d859
|
789
|
|
| mbed714 |
0:d616ece2d859
|
790
|
if (type == IGMP_V2_MEMB_REPORT) {
|
| mbed714 |
0:d616ece2d859
|
791
|
dest = &(group->group_address);
|
| mbed714 |
0:d616ece2d859
|
792
|
ip_addr_copy(igmp->igmp_group_address, group->group_address);
|
| mbed714 |
0:d616ece2d859
|
793
|
group->last_reporter_flag = 1; /* Remember we were the last to report */
|
| mbed714 |
0:d616ece2d859
|
794
|
} else {
|
| mbed714 |
0:d616ece2d859
|
795
|
if (type == IGMP_LEAVE_GROUP) {
|
| mbed714 |
0:d616ece2d859
|
796
|
dest = &allrouters;
|
| mbed714 |
0:d616ece2d859
|
797
|
ip_addr_copy(igmp->igmp_group_address, group->group_address);
|
| mbed714 |
0:d616ece2d859
|
798
|
}
|
| mbed714 |
0:d616ece2d859
|
799
|
}
|
| mbed714 |
0:d616ece2d859
|
800
|
|
| mbed714 |
0:d616ece2d859
|
801
|
if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
|
| mbed714 |
0:d616ece2d859
|
802
|
igmp->igmp_msgtype = type;
|
| mbed714 |
0:d616ece2d859
|
803
|
igmp->igmp_maxresp = 0;
|
| mbed714 |
0:d616ece2d859
|
804
|
igmp->igmp_checksum = 0;
|
| mbed714 |
0:d616ece2d859
|
805
|
igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
|
| mbed714 |
0:d616ece2d859
|
806
|
|
| mbed714 |
0:d616ece2d859
|
807
|
igmp_ip_output_if(p, &src, dest, group->netif);
|
| mbed714 |
0:d616ece2d859
|
808
|
}
|
| mbed714 |
0:d616ece2d859
|
809
|
|
| mbed714 |
0:d616ece2d859
|
810
|
pbuf_free(p);
|
| mbed714 |
0:d616ece2d859
|
811
|
} else {
|
| mbed714 |
0:d616ece2d859
|
812
|
LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
|
| mbed714 |
0:d616ece2d859
|
813
|
IGMP_STATS_INC(igmp.memerr);
|
| mbed714 |
0:d616ece2d859
|
814
|
}
|
| mbed714 |
0:d616ece2d859
|
815
|
}
|
| mbed714 |
0:d616ece2d859
|
816
|
|
| mbed714 |
0:d616ece2d859
|
817
|
#endif /* LWIP_IGMP */
|
Daniel Peter