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lwip/core/ipv4/igmp.c@0:d7bd7384a37c, 2016-12-07 (annotated)

Committer:
grzemich
Date:
Wed Dec 07 23:47:50 2016 +0000
Revision:
0:d7bd7384a37c
dgd

Who changed what in which revision?

UserRevisionLine numberNew contents of line
grzemich 0:d7bd7384a37c 1 /**
grzemich 0:d7bd7384a37c 2 * @file
grzemich 0:d7bd7384a37c 3 * IGMP - Internet Group Management Protocol
grzemich 0:d7bd7384a37c 4 *
grzemich 0:d7bd7384a37c 5 */
grzemich 0:d7bd7384a37c 6
grzemich 0:d7bd7384a37c 7 /*
grzemich 0:d7bd7384a37c 8 * Copyright (c) 2002 CITEL Technologies Ltd.
grzemich 0:d7bd7384a37c 9 * All rights reserved.
grzemich 0:d7bd7384a37c 10 *
grzemich 0:d7bd7384a37c 11 * Redistribution and use in source and binary forms, with or without
grzemich 0:d7bd7384a37c 12 * modification, are permitted provided that the following conditions
grzemich 0:d7bd7384a37c 13 * are met:
grzemich 0:d7bd7384a37c 14 * 1. Redistributions of source code must retain the above copyright
grzemich 0:d7bd7384a37c 15 * notice, this list of conditions and the following disclaimer.
grzemich 0:d7bd7384a37c 16 * 2. Redistributions in binary form must reproduce the above copyright
grzemich 0:d7bd7384a37c 17 * notice, this list of conditions and the following disclaimer in the
grzemich 0:d7bd7384a37c 18 * documentation and/or other materials provided with the distribution.
grzemich 0:d7bd7384a37c 19 * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
grzemich 0:d7bd7384a37c 20 * may be used to endorse or promote products derived from this software
grzemich 0:d7bd7384a37c 21 * without specific prior written permission.
grzemich 0:d7bd7384a37c 22 *
grzemich 0:d7bd7384a37c 23 * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
grzemich 0:d7bd7384a37c 24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
grzemich 0:d7bd7384a37c 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
grzemich 0:d7bd7384a37c 26 * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
grzemich 0:d7bd7384a37c 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
grzemich 0:d7bd7384a37c 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
grzemich 0:d7bd7384a37c 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
grzemich 0:d7bd7384a37c 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
grzemich 0:d7bd7384a37c 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
grzemich 0:d7bd7384a37c 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
grzemich 0:d7bd7384a37c 33 * SUCH DAMAGE.
grzemich 0:d7bd7384a37c 34 *
grzemich 0:d7bd7384a37c 35 * This file is a contribution to the lwIP TCP/IP stack.
grzemich 0:d7bd7384a37c 36 * The Swedish Institute of Computer Science and Adam Dunkels
grzemich 0:d7bd7384a37c 37 * are specifically granted permission to redistribute this
grzemich 0:d7bd7384a37c 38 * source code.
grzemich 0:d7bd7384a37c 39 */
grzemich 0:d7bd7384a37c 40
grzemich 0:d7bd7384a37c 41 /*-------------------------------------------------------------
grzemich 0:d7bd7384a37c 42 Note 1)
grzemich 0:d7bd7384a37c 43 Although the rfc requires V1 AND V2 capability
grzemich 0:d7bd7384a37c 44 we will only support v2 since now V1 is very old (August 1989)
grzemich 0:d7bd7384a37c 45 V1 can be added if required
grzemich 0:d7bd7384a37c 46
grzemich 0:d7bd7384a37c 47 a debug print and statistic have been implemented to
grzemich 0:d7bd7384a37c 48 show this up.
grzemich 0:d7bd7384a37c 49 -------------------------------------------------------------
grzemich 0:d7bd7384a37c 50 -------------------------------------------------------------
grzemich 0:d7bd7384a37c 51 Note 2)
grzemich 0:d7bd7384a37c 52 A query for a specific group address (as opposed to ALLHOSTS)
grzemich 0:d7bd7384a37c 53 has now been implemented as I am unsure if it is required
grzemich 0:d7bd7384a37c 54
grzemich 0:d7bd7384a37c 55 a debug print and statistic have been implemented to
grzemich 0:d7bd7384a37c 56 show this up.
grzemich 0:d7bd7384a37c 57 -------------------------------------------------------------
grzemich 0:d7bd7384a37c 58 -------------------------------------------------------------
grzemich 0:d7bd7384a37c 59 Note 3)
grzemich 0:d7bd7384a37c 60 The router alert rfc 2113 is implemented in outgoing packets
grzemich 0:d7bd7384a37c 61 but not checked rigorously incoming
grzemich 0:d7bd7384a37c 62 -------------------------------------------------------------
grzemich 0:d7bd7384a37c 63 Steve Reynolds
grzemich 0:d7bd7384a37c 64 ------------------------------------------------------------*/
grzemich 0:d7bd7384a37c 65
grzemich 0:d7bd7384a37c 66 /*-----------------------------------------------------------------------------
grzemich 0:d7bd7384a37c 67 * RFC 988 - Host extensions for IP multicasting - V0
grzemich 0:d7bd7384a37c 68 * RFC 1054 - Host extensions for IP multicasting -
grzemich 0:d7bd7384a37c 69 * RFC 1112 - Host extensions for IP multicasting - V1
grzemich 0:d7bd7384a37c 70 * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
grzemich 0:d7bd7384a37c 71 * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
grzemich 0:d7bd7384a37c 72 * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
grzemich 0:d7bd7384a37c 73 * RFC 2113 - IP Router Alert Option -
grzemich 0:d7bd7384a37c 74 *----------------------------------------------------------------------------*/
grzemich 0:d7bd7384a37c 75
grzemich 0:d7bd7384a37c 76 /*-----------------------------------------------------------------------------
grzemich 0:d7bd7384a37c 77 * Includes
grzemich 0:d7bd7384a37c 78 *----------------------------------------------------------------------------*/
grzemich 0:d7bd7384a37c 79
grzemich 0:d7bd7384a37c 80 #include "lwip/opt.h"
grzemich 0:d7bd7384a37c 81
grzemich 0:d7bd7384a37c 82 #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
grzemich 0:d7bd7384a37c 83
grzemich 0:d7bd7384a37c 84 #include "lwip/igmp.h"
grzemich 0:d7bd7384a37c 85 #include "lwip/debug.h"
grzemich 0:d7bd7384a37c 86 #include "lwip/def.h"
grzemich 0:d7bd7384a37c 87 #include "lwip/mem.h"
grzemich 0:d7bd7384a37c 88 #include "lwip/ip.h"
grzemich 0:d7bd7384a37c 89 #include "lwip/inet_chksum.h"
grzemich 0:d7bd7384a37c 90 #include "lwip/netif.h"
grzemich 0:d7bd7384a37c 91 #include "lwip/icmp.h"
grzemich 0:d7bd7384a37c 92 #include "lwip/udp.h"
grzemich 0:d7bd7384a37c 93 #include "lwip/tcp.h"
grzemich 0:d7bd7384a37c 94 #include "lwip/stats.h"
grzemich 0:d7bd7384a37c 95
grzemich 0:d7bd7384a37c 96 #include "string.h"
grzemich 0:d7bd7384a37c 97
grzemich 0:d7bd7384a37c 98 /*
grzemich 0:d7bd7384a37c 99 * IGMP constants
grzemich 0:d7bd7384a37c 100 */
grzemich 0:d7bd7384a37c 101 #define IGMP_TTL 1
grzemich 0:d7bd7384a37c 102 #define IGMP_MINLEN 8
grzemich 0:d7bd7384a37c 103 #define ROUTER_ALERT 0x9404U
grzemich 0:d7bd7384a37c 104 #define ROUTER_ALERTLEN 4
grzemich 0:d7bd7384a37c 105
grzemich 0:d7bd7384a37c 106 /*
grzemich 0:d7bd7384a37c 107 * IGMP message types, including version number.
grzemich 0:d7bd7384a37c 108 */
grzemich 0:d7bd7384a37c 109 #define IGMP_MEMB_QUERY 0x11 /* Membership query */
grzemich 0:d7bd7384a37c 110 #define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
grzemich 0:d7bd7384a37c 111 #define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
grzemich 0:d7bd7384a37c 112 #define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
grzemich 0:d7bd7384a37c 113
grzemich 0:d7bd7384a37c 114 /* Group membership states */
grzemich 0:d7bd7384a37c 115 #define IGMP_GROUP_NON_MEMBER 0
grzemich 0:d7bd7384a37c 116 #define IGMP_GROUP_DELAYING_MEMBER 1
grzemich 0:d7bd7384a37c 117 #define IGMP_GROUP_IDLE_MEMBER 2
grzemich 0:d7bd7384a37c 118
grzemich 0:d7bd7384a37c 119 /**
grzemich 0:d7bd7384a37c 120 * IGMP packet format.
grzemich 0:d7bd7384a37c 121 */
grzemich 0:d7bd7384a37c 122 #ifdef PACK_STRUCT_USE_INCLUDES
grzemich 0:d7bd7384a37c 123 # include "arch/bpstruct.h"
grzemich 0:d7bd7384a37c 124 #endif
grzemich 0:d7bd7384a37c 125 PACK_STRUCT_BEGIN
grzemich 0:d7bd7384a37c 126 struct igmp_msg {
grzemich 0:d7bd7384a37c 127 PACK_STRUCT_FIELD(u8_t igmp_msgtype);
grzemich 0:d7bd7384a37c 128 PACK_STRUCT_FIELD(u8_t igmp_maxresp);
grzemich 0:d7bd7384a37c 129 PACK_STRUCT_FIELD(u16_t igmp_checksum);
grzemich 0:d7bd7384a37c 130 PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
grzemich 0:d7bd7384a37c 131 } PACK_STRUCT_STRUCT;
grzemich 0:d7bd7384a37c 132 PACK_STRUCT_END
grzemich 0:d7bd7384a37c 133 #ifdef PACK_STRUCT_USE_INCLUDES
grzemich 0:d7bd7384a37c 134 # include "arch/epstruct.h"
grzemich 0:d7bd7384a37c 135 #endif
grzemich 0:d7bd7384a37c 136
grzemich 0:d7bd7384a37c 137
grzemich 0:d7bd7384a37c 138 static struct igmp_group *igmp_lookup_group(struct netif *ifp, ip_addr_t *addr);
grzemich 0:d7bd7384a37c 139 static err_t igmp_remove_group(struct igmp_group *group);
grzemich 0:d7bd7384a37c 140 static void igmp_timeout( struct igmp_group *group);
grzemich 0:d7bd7384a37c 141 static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
grzemich 0:d7bd7384a37c 142 static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
grzemich 0:d7bd7384a37c 143 static err_t igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif);
grzemich 0:d7bd7384a37c 144 static void igmp_send(struct igmp_group *group, u8_t type);
grzemich 0:d7bd7384a37c 145
grzemich 0:d7bd7384a37c 146
grzemich 0:d7bd7384a37c 147 static struct igmp_group* igmp_group_list;
grzemich 0:d7bd7384a37c 148 static ip_addr_t allsystems;
grzemich 0:d7bd7384a37c 149 static ip_addr_t allrouters;
grzemich 0:d7bd7384a37c 150
grzemich 0:d7bd7384a37c 151
grzemich 0:d7bd7384a37c 152 /**
grzemich 0:d7bd7384a37c 153 * Initialize the IGMP module
grzemich 0:d7bd7384a37c 154 */
grzemich 0:d7bd7384a37c 155 void
grzemich 0:d7bd7384a37c 156 igmp_init(void)
grzemich 0:d7bd7384a37c 157 {
grzemich 0:d7bd7384a37c 158 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
grzemich 0:d7bd7384a37c 159
grzemich 0:d7bd7384a37c 160 IP4_ADDR(&allsystems, 224, 0, 0, 1);
grzemich 0:d7bd7384a37c 161 IP4_ADDR(&allrouters, 224, 0, 0, 2);
grzemich 0:d7bd7384a37c 162 }
grzemich 0:d7bd7384a37c 163
grzemich 0:d7bd7384a37c 164 #ifdef LWIP_DEBUG
grzemich 0:d7bd7384a37c 165 /**
grzemich 0:d7bd7384a37c 166 * Dump global IGMP groups list
grzemich 0:d7bd7384a37c 167 */
grzemich 0:d7bd7384a37c 168 void
grzemich 0:d7bd7384a37c 169 igmp_dump_group_list()
grzemich 0:d7bd7384a37c 170 {
grzemich 0:d7bd7384a37c 171 struct igmp_group *group = igmp_group_list;
grzemich 0:d7bd7384a37c 172
grzemich 0:d7bd7384a37c 173 while (group != NULL) {
grzemich 0:d7bd7384a37c 174 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
grzemich 0:d7bd7384a37c 175 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
grzemich 0:d7bd7384a37c 176 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
grzemich 0:d7bd7384a37c 177 group = group->next;
grzemich 0:d7bd7384a37c 178 }
grzemich 0:d7bd7384a37c 179 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
grzemich 0:d7bd7384a37c 180 }
grzemich 0:d7bd7384a37c 181 #else
grzemich 0:d7bd7384a37c 182 #define igmp_dump_group_list()
grzemich 0:d7bd7384a37c 183 #endif /* LWIP_DEBUG */
grzemich 0:d7bd7384a37c 184
grzemich 0:d7bd7384a37c 185 /**
grzemich 0:d7bd7384a37c 186 * Start IGMP processing on interface
grzemich 0:d7bd7384a37c 187 *
grzemich 0:d7bd7384a37c 188 * @param netif network interface on which start IGMP processing
grzemich 0:d7bd7384a37c 189 */
grzemich 0:d7bd7384a37c 190 err_t
grzemich 0:d7bd7384a37c 191 igmp_start(struct netif *netif)
grzemich 0:d7bd7384a37c 192 {
grzemich 0:d7bd7384a37c 193 struct igmp_group* group;
grzemich 0:d7bd7384a37c 194
grzemich 0:d7bd7384a37c 195 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
grzemich 0:d7bd7384a37c 196
grzemich 0:d7bd7384a37c 197 group = igmp_lookup_group(netif, &allsystems);
grzemich 0:d7bd7384a37c 198
grzemich 0:d7bd7384a37c 199 if (group != NULL) {
grzemich 0:d7bd7384a37c 200 group->group_state = IGMP_GROUP_IDLE_MEMBER;
grzemich 0:d7bd7384a37c 201 group->use++;
grzemich 0:d7bd7384a37c 202
grzemich 0:d7bd7384a37c 203 /* Allow the igmp messages at the MAC level */
grzemich 0:d7bd7384a37c 204 if (netif->igmp_mac_filter != NULL) {
grzemich 0:d7bd7384a37c 205 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
grzemich 0:d7bd7384a37c 206 ip_addr_debug_print(IGMP_DEBUG, &allsystems);
grzemich 0:d7bd7384a37c 207 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
grzemich 0:d7bd7384a37c 208 netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
grzemich 0:d7bd7384a37c 209 }
grzemich 0:d7bd7384a37c 210
grzemich 0:d7bd7384a37c 211 return ERR_OK;
grzemich 0:d7bd7384a37c 212 }
grzemich 0:d7bd7384a37c 213
grzemich 0:d7bd7384a37c 214 return ERR_MEM;
grzemich 0:d7bd7384a37c 215 }
grzemich 0:d7bd7384a37c 216
grzemich 0:d7bd7384a37c 217 /**
grzemich 0:d7bd7384a37c 218 * Stop IGMP processing on interface
grzemich 0:d7bd7384a37c 219 *
grzemich 0:d7bd7384a37c 220 * @param netif network interface on which stop IGMP processing
grzemich 0:d7bd7384a37c 221 */
grzemich 0:d7bd7384a37c 222 err_t
grzemich 0:d7bd7384a37c 223 igmp_stop(struct netif *netif)
grzemich 0:d7bd7384a37c 224 {
grzemich 0:d7bd7384a37c 225 struct igmp_group *group = igmp_group_list;
grzemich 0:d7bd7384a37c 226 struct igmp_group *prev = NULL;
grzemich 0:d7bd7384a37c 227 struct igmp_group *next;
grzemich 0:d7bd7384a37c 228
grzemich 0:d7bd7384a37c 229 /* look for groups joined on this interface further down the list */
grzemich 0:d7bd7384a37c 230 while (group != NULL) {
grzemich 0:d7bd7384a37c 231 next = group->next;
grzemich 0:d7bd7384a37c 232 /* is it a group joined on this interface? */
grzemich 0:d7bd7384a37c 233 if (group->netif == netif) {
grzemich 0:d7bd7384a37c 234 /* is it the first group of the list? */
grzemich 0:d7bd7384a37c 235 if (group == igmp_group_list) {
grzemich 0:d7bd7384a37c 236 igmp_group_list = next;
grzemich 0:d7bd7384a37c 237 }
grzemich 0:d7bd7384a37c 238 /* is there a "previous" group defined? */
grzemich 0:d7bd7384a37c 239 if (prev != NULL) {
grzemich 0:d7bd7384a37c 240 prev->next = next;
grzemich 0:d7bd7384a37c 241 }
grzemich 0:d7bd7384a37c 242 /* disable the group at the MAC level */
grzemich 0:d7bd7384a37c 243 if (netif->igmp_mac_filter != NULL) {
grzemich 0:d7bd7384a37c 244 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
grzemich 0:d7bd7384a37c 245 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
grzemich 0:d7bd7384a37c 246 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
grzemich 0:d7bd7384a37c 247 netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
grzemich 0:d7bd7384a37c 248 }
grzemich 0:d7bd7384a37c 249 /* free group */
grzemich 0:d7bd7384a37c 250 memp_free(MEMP_IGMP_GROUP, group);
grzemich 0:d7bd7384a37c 251 } else {
grzemich 0:d7bd7384a37c 252 /* change the "previous" */
grzemich 0:d7bd7384a37c 253 prev = group;
grzemich 0:d7bd7384a37c 254 }
grzemich 0:d7bd7384a37c 255 /* move to "next" */
grzemich 0:d7bd7384a37c 256 group = next;
grzemich 0:d7bd7384a37c 257 }
grzemich 0:d7bd7384a37c 258 return ERR_OK;
grzemich 0:d7bd7384a37c 259 }
grzemich 0:d7bd7384a37c 260
grzemich 0:d7bd7384a37c 261 /**
grzemich 0:d7bd7384a37c 262 * Report IGMP memberships for this interface
grzemich 0:d7bd7384a37c 263 *
grzemich 0:d7bd7384a37c 264 * @param netif network interface on which report IGMP memberships
grzemich 0:d7bd7384a37c 265 */
grzemich 0:d7bd7384a37c 266 void
grzemich 0:d7bd7384a37c 267 igmp_report_groups(struct netif *netif)
grzemich 0:d7bd7384a37c 268 {
grzemich 0:d7bd7384a37c 269 struct igmp_group *group = igmp_group_list;
grzemich 0:d7bd7384a37c 270
grzemich 0:d7bd7384a37c 271 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
grzemich 0:d7bd7384a37c 272
grzemich 0:d7bd7384a37c 273 while (group != NULL) {
grzemich 0:d7bd7384a37c 274 if (group->netif == netif) {
grzemich 0:d7bd7384a37c 275 igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
grzemich 0:d7bd7384a37c 276 }
grzemich 0:d7bd7384a37c 277 group = group->next;
grzemich 0:d7bd7384a37c 278 }
grzemich 0:d7bd7384a37c 279 }
grzemich 0:d7bd7384a37c 280
grzemich 0:d7bd7384a37c 281 /**
grzemich 0:d7bd7384a37c 282 * Search for a group in the global igmp_group_list
grzemich 0:d7bd7384a37c 283 *
grzemich 0:d7bd7384a37c 284 * @param ifp the network interface for which to look
grzemich 0:d7bd7384a37c 285 * @param addr the group ip address to search for
grzemich 0:d7bd7384a37c 286 * @return a struct igmp_group* if the group has been found,
grzemich 0:d7bd7384a37c 287 * NULL if the group wasn't found.
grzemich 0:d7bd7384a37c 288 */
grzemich 0:d7bd7384a37c 289 struct igmp_group *
grzemich 0:d7bd7384a37c 290 igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr)
grzemich 0:d7bd7384a37c 291 {
grzemich 0:d7bd7384a37c 292 struct igmp_group *group = igmp_group_list;
grzemich 0:d7bd7384a37c 293
grzemich 0:d7bd7384a37c 294 while (group != NULL) {
grzemich 0:d7bd7384a37c 295 if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
grzemich 0:d7bd7384a37c 296 return group;
grzemich 0:d7bd7384a37c 297 }
grzemich 0:d7bd7384a37c 298 group = group->next;
grzemich 0:d7bd7384a37c 299 }
grzemich 0:d7bd7384a37c 300
grzemich 0:d7bd7384a37c 301 /* to be clearer, we return NULL here instead of
grzemich 0:d7bd7384a37c 302 * 'group' (which is also NULL at this point).
grzemich 0:d7bd7384a37c 303 */
grzemich 0:d7bd7384a37c 304 return NULL;
grzemich 0:d7bd7384a37c 305 }
grzemich 0:d7bd7384a37c 306
grzemich 0:d7bd7384a37c 307 /**
grzemich 0:d7bd7384a37c 308 * Search for a specific igmp group and create a new one if not found-
grzemich 0:d7bd7384a37c 309 *
grzemich 0:d7bd7384a37c 310 * @param ifp the network interface for which to look
grzemich 0:d7bd7384a37c 311 * @param addr the group ip address to search
grzemich 0:d7bd7384a37c 312 * @return a struct igmp_group*,
grzemich 0:d7bd7384a37c 313 * NULL on memory error.
grzemich 0:d7bd7384a37c 314 */
grzemich 0:d7bd7384a37c 315 struct igmp_group *
grzemich 0:d7bd7384a37c 316 igmp_lookup_group(struct netif *ifp, ip_addr_t *addr)
grzemich 0:d7bd7384a37c 317 {
grzemich 0:d7bd7384a37c 318 struct igmp_group *group = igmp_group_list;
grzemich 0:d7bd7384a37c 319
grzemich 0:d7bd7384a37c 320 /* Search if the group already exists */
grzemich 0:d7bd7384a37c 321 group = igmp_lookfor_group(ifp, addr);
grzemich 0:d7bd7384a37c 322 if (group != NULL) {
grzemich 0:d7bd7384a37c 323 /* Group already exists. */
grzemich 0:d7bd7384a37c 324 return group;
grzemich 0:d7bd7384a37c 325 }
grzemich 0:d7bd7384a37c 326
grzemich 0:d7bd7384a37c 327 /* Group doesn't exist yet, create a new one */
grzemich 0:d7bd7384a37c 328 group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
grzemich 0:d7bd7384a37c 329 if (group != NULL) {
grzemich 0:d7bd7384a37c 330 group->netif = ifp;
grzemich 0:d7bd7384a37c 331 ip_addr_set(&(group->group_address), addr);
grzemich 0:d7bd7384a37c 332 group->timer = 0; /* Not running */
grzemich 0:d7bd7384a37c 333 group->group_state = IGMP_GROUP_NON_MEMBER;
grzemich 0:d7bd7384a37c 334 group->last_reporter_flag = 0;
grzemich 0:d7bd7384a37c 335 group->use = 0;
grzemich 0:d7bd7384a37c 336 group->next = igmp_group_list;
grzemich 0:d7bd7384a37c 337
grzemich 0:d7bd7384a37c 338 igmp_group_list = group;
grzemich 0:d7bd7384a37c 339 }
grzemich 0:d7bd7384a37c 340
grzemich 0:d7bd7384a37c 341 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
grzemich 0:d7bd7384a37c 342 ip_addr_debug_print(IGMP_DEBUG, addr);
grzemich 0:d7bd7384a37c 343 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
grzemich 0:d7bd7384a37c 344
grzemich 0:d7bd7384a37c 345 return group;
grzemich 0:d7bd7384a37c 346 }
grzemich 0:d7bd7384a37c 347
grzemich 0:d7bd7384a37c 348 /**
grzemich 0:d7bd7384a37c 349 * Remove a group in the global igmp_group_list
grzemich 0:d7bd7384a37c 350 *
grzemich 0:d7bd7384a37c 351 * @param group the group to remove from the global igmp_group_list
grzemich 0:d7bd7384a37c 352 * @return ERR_OK if group was removed from the list, an err_t otherwise
grzemich 0:d7bd7384a37c 353 */
grzemich 0:d7bd7384a37c 354 static err_t
grzemich 0:d7bd7384a37c 355 igmp_remove_group(struct igmp_group *group)
grzemich 0:d7bd7384a37c 356 {
grzemich 0:d7bd7384a37c 357 err_t err = ERR_OK;
grzemich 0:d7bd7384a37c 358
grzemich 0:d7bd7384a37c 359 /* Is it the first group? */
grzemich 0:d7bd7384a37c 360 if (igmp_group_list == group) {
grzemich 0:d7bd7384a37c 361 igmp_group_list = group->next;
grzemich 0:d7bd7384a37c 362 } else {
grzemich 0:d7bd7384a37c 363 /* look for group further down the list */
grzemich 0:d7bd7384a37c 364 struct igmp_group *tmpGroup;
grzemich 0:d7bd7384a37c 365 for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
grzemich 0:d7bd7384a37c 366 if (tmpGroup->next == group) {
grzemich 0:d7bd7384a37c 367 tmpGroup->next = group->next;
grzemich 0:d7bd7384a37c 368 break;
grzemich 0:d7bd7384a37c 369 }
grzemich 0:d7bd7384a37c 370 }
grzemich 0:d7bd7384a37c 371 /* Group not found in the global igmp_group_list */
grzemich 0:d7bd7384a37c 372 if (tmpGroup == NULL)
grzemich 0:d7bd7384a37c 373 err = ERR_ARG;
grzemich 0:d7bd7384a37c 374 }
grzemich 0:d7bd7384a37c 375 /* free group */
grzemich 0:d7bd7384a37c 376 memp_free(MEMP_IGMP_GROUP, group);
grzemich 0:d7bd7384a37c 377
grzemich 0:d7bd7384a37c 378 return err;
grzemich 0:d7bd7384a37c 379 }
grzemich 0:d7bd7384a37c 380
grzemich 0:d7bd7384a37c 381 /**
grzemich 0:d7bd7384a37c 382 * Called from ip_input() if a new IGMP packet is received.
grzemich 0:d7bd7384a37c 383 *
grzemich 0:d7bd7384a37c 384 * @param p received igmp packet, p->payload pointing to the ip header
grzemich 0:d7bd7384a37c 385 * @param inp network interface on which the packet was received
grzemich 0:d7bd7384a37c 386 * @param dest destination ip address of the igmp packet
grzemich 0:d7bd7384a37c 387 */
grzemich 0:d7bd7384a37c 388 void
grzemich 0:d7bd7384a37c 389 igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest)
grzemich 0:d7bd7384a37c 390 {
grzemich 0:d7bd7384a37c 391 struct ip_hdr * iphdr;
grzemich 0:d7bd7384a37c 392 struct igmp_msg* igmp;
grzemich 0:d7bd7384a37c 393 struct igmp_group* group;
grzemich 0:d7bd7384a37c 394 struct igmp_group* groupref;
grzemich 0:d7bd7384a37c 395
grzemich 0:d7bd7384a37c 396 IGMP_STATS_INC(igmp.recv);
grzemich 0:d7bd7384a37c 397
grzemich 0:d7bd7384a37c 398 /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
grzemich 0:d7bd7384a37c 399 iphdr = (struct ip_hdr *)p->payload;
grzemich 0:d7bd7384a37c 400 if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
grzemich 0:d7bd7384a37c 401 pbuf_free(p);
grzemich 0:d7bd7384a37c 402 IGMP_STATS_INC(igmp.lenerr);
grzemich 0:d7bd7384a37c 403 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
grzemich 0:d7bd7384a37c 404 return;
grzemich 0:d7bd7384a37c 405 }
grzemich 0:d7bd7384a37c 406
grzemich 0:d7bd7384a37c 407 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
grzemich 0:d7bd7384a37c 408 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
grzemich 0:d7bd7384a37c 409 LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
grzemich 0:d7bd7384a37c 410 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
grzemich 0:d7bd7384a37c 411 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
grzemich 0:d7bd7384a37c 412
grzemich 0:d7bd7384a37c 413 /* Now calculate and check the checksum */
grzemich 0:d7bd7384a37c 414 igmp = (struct igmp_msg *)p->payload;
grzemich 0:d7bd7384a37c 415 if (inet_chksum(igmp, p->len)) {
grzemich 0:d7bd7384a37c 416 pbuf_free(p);
grzemich 0:d7bd7384a37c 417 IGMP_STATS_INC(igmp.chkerr);
grzemich 0:d7bd7384a37c 418 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
grzemich 0:d7bd7384a37c 419 return;
grzemich 0:d7bd7384a37c 420 }
grzemich 0:d7bd7384a37c 421
grzemich 0:d7bd7384a37c 422 /* Packet is ok so find an existing group */
grzemich 0:d7bd7384a37c 423 group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
grzemich 0:d7bd7384a37c 424
grzemich 0:d7bd7384a37c 425 /* If group can be found or create... */
grzemich 0:d7bd7384a37c 426 if (!group) {
grzemich 0:d7bd7384a37c 427 pbuf_free(p);
grzemich 0:d7bd7384a37c 428 IGMP_STATS_INC(igmp.drop);
grzemich 0:d7bd7384a37c 429 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
grzemich 0:d7bd7384a37c 430 return;
grzemich 0:d7bd7384a37c 431 }
grzemich 0:d7bd7384a37c 432
grzemich 0:d7bd7384a37c 433 /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
grzemich 0:d7bd7384a37c 434 switch (igmp->igmp_msgtype) {
grzemich 0:d7bd7384a37c 435 case IGMP_MEMB_QUERY: {
grzemich 0:d7bd7384a37c 436 /* IGMP_MEMB_QUERY to the "all systems" address ? */
grzemich 0:d7bd7384a37c 437 if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
grzemich 0:d7bd7384a37c 438 /* THIS IS THE GENERAL QUERY */
grzemich 0:d7bd7384a37c 439 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)));
grzemich 0:d7bd7384a37c 440
grzemich 0:d7bd7384a37c 441 if (igmp->igmp_maxresp == 0) {
grzemich 0:d7bd7384a37c 442 IGMP_STATS_INC(igmp.rx_v1);
grzemich 0:d7bd7384a37c 443 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
grzemich 0:d7bd7384a37c 444 igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
grzemich 0:d7bd7384a37c 445 } else {
grzemich 0:d7bd7384a37c 446 IGMP_STATS_INC(igmp.rx_general);
grzemich 0:d7bd7384a37c 447 }
grzemich 0:d7bd7384a37c 448
grzemich 0:d7bd7384a37c 449 groupref = igmp_group_list;
grzemich 0:d7bd7384a37c 450 while (groupref) {
grzemich 0:d7bd7384a37c 451 /* Do not send messages on the all systems group address! */
grzemich 0:d7bd7384a37c 452 if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
grzemich 0:d7bd7384a37c 453 igmp_delaying_member(groupref, igmp->igmp_maxresp);
grzemich 0:d7bd7384a37c 454 }
grzemich 0:d7bd7384a37c 455 groupref = groupref->next;
grzemich 0:d7bd7384a37c 456 }
grzemich 0:d7bd7384a37c 457 } else {
grzemich 0:d7bd7384a37c 458 /* IGMP_MEMB_QUERY to a specific group ? */
grzemich 0:d7bd7384a37c 459 if (!ip_addr_isany(&igmp->igmp_group_address)) {
grzemich 0:d7bd7384a37c 460 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
grzemich 0:d7bd7384a37c 461 ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
grzemich 0:d7bd7384a37c 462 if (ip_addr_cmp(dest, &allsystems)) {
grzemich 0:d7bd7384a37c 463 ip_addr_t groupaddr;
grzemich 0:d7bd7384a37c 464 LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
grzemich 0:d7bd7384a37c 465 /* we first need to re-look for the group since we used dest last time */
grzemich 0:d7bd7384a37c 466 ip_addr_copy(groupaddr, igmp->igmp_group_address);
grzemich 0:d7bd7384a37c 467 group = igmp_lookfor_group(inp, &groupaddr);
grzemich 0:d7bd7384a37c 468 } else {
grzemich 0:d7bd7384a37c 469 LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
grzemich 0:d7bd7384a37c 470 }
grzemich 0:d7bd7384a37c 471
grzemich 0:d7bd7384a37c 472 if (group != NULL) {
grzemich 0:d7bd7384a37c 473 IGMP_STATS_INC(igmp.rx_group);
grzemich 0:d7bd7384a37c 474 igmp_delaying_member(group, igmp->igmp_maxresp);
grzemich 0:d7bd7384a37c 475 } else {
grzemich 0:d7bd7384a37c 476 IGMP_STATS_INC(igmp.drop);
grzemich 0:d7bd7384a37c 477 }
grzemich 0:d7bd7384a37c 478 } else {
grzemich 0:d7bd7384a37c 479 IGMP_STATS_INC(igmp.proterr);
grzemich 0:d7bd7384a37c 480 }
grzemich 0:d7bd7384a37c 481 }
grzemich 0:d7bd7384a37c 482 break;
grzemich 0:d7bd7384a37c 483 }
grzemich 0:d7bd7384a37c 484 case IGMP_V2_MEMB_REPORT: {
grzemich 0:d7bd7384a37c 485 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
grzemich 0:d7bd7384a37c 486 IGMP_STATS_INC(igmp.rx_report);
grzemich 0:d7bd7384a37c 487 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
grzemich 0:d7bd7384a37c 488 /* This is on a specific group we have already looked up */
grzemich 0:d7bd7384a37c 489 group->timer = 0; /* stopped */
grzemich 0:d7bd7384a37c 490 group->group_state = IGMP_GROUP_IDLE_MEMBER;
grzemich 0:d7bd7384a37c 491 group->last_reporter_flag = 0;
grzemich 0:d7bd7384a37c 492 }
grzemich 0:d7bd7384a37c 493 break;
grzemich 0:d7bd7384a37c 494 }
grzemich 0:d7bd7384a37c 495 default: {
grzemich 0:d7bd7384a37c 496 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
grzemich 0:d7bd7384a37c 497 igmp->igmp_msgtype, group->group_state, &group, group->netif));
grzemich 0:d7bd7384a37c 498 IGMP_STATS_INC(igmp.proterr);
grzemich 0:d7bd7384a37c 499 break;
grzemich 0:d7bd7384a37c 500 }
grzemich 0:d7bd7384a37c 501 }
grzemich 0:d7bd7384a37c 502
grzemich 0:d7bd7384a37c 503 pbuf_free(p);
grzemich 0:d7bd7384a37c 504 return;
grzemich 0:d7bd7384a37c 505 }
grzemich 0:d7bd7384a37c 506
grzemich 0:d7bd7384a37c 507 /**
grzemich 0:d7bd7384a37c 508 * Join a group on one network interface.
grzemich 0:d7bd7384a37c 509 *
grzemich 0:d7bd7384a37c 510 * @param ifaddr ip address of the network interface which should join a new group
grzemich 0:d7bd7384a37c 511 * @param groupaddr the ip address of the group which to join
grzemich 0:d7bd7384a37c 512 * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
grzemich 0:d7bd7384a37c 513 */
grzemich 0:d7bd7384a37c 514 err_t
grzemich 0:d7bd7384a37c 515 igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
grzemich 0:d7bd7384a37c 516 {
grzemich 0:d7bd7384a37c 517 err_t err = ERR_VAL; /* no matching interface */
grzemich 0:d7bd7384a37c 518 struct igmp_group *group;
grzemich 0:d7bd7384a37c 519 struct netif *netif;
grzemich 0:d7bd7384a37c 520
grzemich 0:d7bd7384a37c 521 /* make sure it is multicast address */
grzemich 0:d7bd7384a37c 522 LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
grzemich 0:d7bd7384a37c 523 LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
grzemich 0:d7bd7384a37c 524
grzemich 0:d7bd7384a37c 525 /* loop through netif's */
grzemich 0:d7bd7384a37c 526 netif = netif_list;
grzemich 0:d7bd7384a37c 527 while (netif != NULL) {
grzemich 0:d7bd7384a37c 528 /* Should we join this interface ? */
grzemich 0:d7bd7384a37c 529 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
grzemich 0:d7bd7384a37c 530 /* find group or create a new one if not found */
grzemich 0:d7bd7384a37c 531 group = igmp_lookup_group(netif, groupaddr);
grzemich 0:d7bd7384a37c 532
grzemich 0:d7bd7384a37c 533 if (group != NULL) {
grzemich 0:d7bd7384a37c 534 /* This should create a new group, check the state to make sure */
grzemich 0:d7bd7384a37c 535 if (group->group_state != IGMP_GROUP_NON_MEMBER) {
grzemich 0:d7bd7384a37c 536 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
grzemich 0:d7bd7384a37c 537 } else {
grzemich 0:d7bd7384a37c 538 /* OK - it was new group */
grzemich 0:d7bd7384a37c 539 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
grzemich 0:d7bd7384a37c 540 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
grzemich 0:d7bd7384a37c 541 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
grzemich 0:d7bd7384a37c 542
grzemich 0:d7bd7384a37c 543 /* If first use of the group, allow the group at the MAC level */
grzemich 0:d7bd7384a37c 544 if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
grzemich 0:d7bd7384a37c 545 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
grzemich 0:d7bd7384a37c 546 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
grzemich 0:d7bd7384a37c 547 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
grzemich 0:d7bd7384a37c 548 netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
grzemich 0:d7bd7384a37c 549 }
grzemich 0:d7bd7384a37c 550
grzemich 0:d7bd7384a37c 551 IGMP_STATS_INC(igmp.tx_join);
grzemich 0:d7bd7384a37c 552 igmp_send(group, IGMP_V2_MEMB_REPORT);
grzemich 0:d7bd7384a37c 553
grzemich 0:d7bd7384a37c 554 igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
grzemich 0:d7bd7384a37c 555
grzemich 0:d7bd7384a37c 556 /* Need to work out where this timer comes from */
grzemich 0:d7bd7384a37c 557 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
grzemich 0:d7bd7384a37c 558 }
grzemich 0:d7bd7384a37c 559 /* Increment group use */
grzemich 0:d7bd7384a37c 560 group->use++;
grzemich 0:d7bd7384a37c 561 /* Join on this interface */
grzemich 0:d7bd7384a37c 562 err = ERR_OK;
grzemich 0:d7bd7384a37c 563 } else {
grzemich 0:d7bd7384a37c 564 /* Return an error even if some network interfaces are joined */
grzemich 0:d7bd7384a37c 565 /** @todo undo any other netif already joined */
grzemich 0:d7bd7384a37c 566 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
grzemich 0:d7bd7384a37c 567 return ERR_MEM;
grzemich 0:d7bd7384a37c 568 }
grzemich 0:d7bd7384a37c 569 }
grzemich 0:d7bd7384a37c 570 /* proceed to next network interface */
grzemich 0:d7bd7384a37c 571 netif = netif->next;
grzemich 0:d7bd7384a37c 572 }
grzemich 0:d7bd7384a37c 573
grzemich 0:d7bd7384a37c 574 return err;
grzemich 0:d7bd7384a37c 575 }
grzemich 0:d7bd7384a37c 576
grzemich 0:d7bd7384a37c 577 /**
grzemich 0:d7bd7384a37c 578 * Leave a group on one network interface.
grzemich 0:d7bd7384a37c 579 *
grzemich 0:d7bd7384a37c 580 * @param ifaddr ip address of the network interface which should leave a group
grzemich 0:d7bd7384a37c 581 * @param groupaddr the ip address of the group which to leave
grzemich 0:d7bd7384a37c 582 * @return ERR_OK if group was left on the netif(s), an err_t otherwise
grzemich 0:d7bd7384a37c 583 */
grzemich 0:d7bd7384a37c 584 err_t
grzemich 0:d7bd7384a37c 585 igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
grzemich 0:d7bd7384a37c 586 {
grzemich 0:d7bd7384a37c 587 err_t err = ERR_VAL; /* no matching interface */
grzemich 0:d7bd7384a37c 588 struct igmp_group *group;
grzemich 0:d7bd7384a37c 589 struct netif *netif;
grzemich 0:d7bd7384a37c 590
grzemich 0:d7bd7384a37c 591 /* make sure it is multicast address */
grzemich 0:d7bd7384a37c 592 LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
grzemich 0:d7bd7384a37c 593 LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
grzemich 0:d7bd7384a37c 594
grzemich 0:d7bd7384a37c 595 /* loop through netif's */
grzemich 0:d7bd7384a37c 596 netif = netif_list;
grzemich 0:d7bd7384a37c 597 while (netif != NULL) {
grzemich 0:d7bd7384a37c 598 /* Should we leave this interface ? */
grzemich 0:d7bd7384a37c 599 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
grzemich 0:d7bd7384a37c 600 /* find group */
grzemich 0:d7bd7384a37c 601 group = igmp_lookfor_group(netif, groupaddr);
grzemich 0:d7bd7384a37c 602
grzemich 0:d7bd7384a37c 603 if (group != NULL) {
grzemich 0:d7bd7384a37c 604 /* Only send a leave if the flag is set according to the state diagram */
grzemich 0:d7bd7384a37c 605 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
grzemich 0:d7bd7384a37c 606 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
grzemich 0:d7bd7384a37c 607 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
grzemich 0:d7bd7384a37c 608
grzemich 0:d7bd7384a37c 609 /* If there is no other use of the group */
grzemich 0:d7bd7384a37c 610 if (group->use <= 1) {
grzemich 0:d7bd7384a37c 611 /* If we are the last reporter for this group */
grzemich 0:d7bd7384a37c 612 if (group->last_reporter_flag) {
grzemich 0:d7bd7384a37c 613 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
grzemich 0:d7bd7384a37c 614 IGMP_STATS_INC(igmp.tx_leave);
grzemich 0:d7bd7384a37c 615 igmp_send(group, IGMP_LEAVE_GROUP);
grzemich 0:d7bd7384a37c 616 }
grzemich 0:d7bd7384a37c 617
grzemich 0:d7bd7384a37c 618 /* Disable the group at the MAC level */
grzemich 0:d7bd7384a37c 619 if (netif->igmp_mac_filter != NULL) {
grzemich 0:d7bd7384a37c 620 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
grzemich 0:d7bd7384a37c 621 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
grzemich 0:d7bd7384a37c 622 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
grzemich 0:d7bd7384a37c 623 netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
grzemich 0:d7bd7384a37c 624 }
grzemich 0:d7bd7384a37c 625
grzemich 0:d7bd7384a37c 626 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
grzemich 0:d7bd7384a37c 627 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
grzemich 0:d7bd7384a37c 628 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
grzemich 0:d7bd7384a37c 629
grzemich 0:d7bd7384a37c 630 /* Free the group */
grzemich 0:d7bd7384a37c 631 igmp_remove_group(group);
grzemich 0:d7bd7384a37c 632 } else {
grzemich 0:d7bd7384a37c 633 /* Decrement group use */
grzemich 0:d7bd7384a37c 634 group->use--;
grzemich 0:d7bd7384a37c 635 }
grzemich 0:d7bd7384a37c 636 /* Leave on this interface */
grzemich 0:d7bd7384a37c 637 err = ERR_OK;
grzemich 0:d7bd7384a37c 638 } else {
grzemich 0:d7bd7384a37c 639 /* It's not a fatal error on "leavegroup" */
grzemich 0:d7bd7384a37c 640 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
grzemich 0:d7bd7384a37c 641 }
grzemich 0:d7bd7384a37c 642 }
grzemich 0:d7bd7384a37c 643 /* proceed to next network interface */
grzemich 0:d7bd7384a37c 644 netif = netif->next;
grzemich 0:d7bd7384a37c 645 }
grzemich 0:d7bd7384a37c 646
grzemich 0:d7bd7384a37c 647 return err;
grzemich 0:d7bd7384a37c 648 }
grzemich 0:d7bd7384a37c 649
grzemich 0:d7bd7384a37c 650 /**
grzemich 0:d7bd7384a37c 651 * The igmp timer function (both for NO_SYS=1 and =0)
grzemich 0:d7bd7384a37c 652 * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
grzemich 0:d7bd7384a37c 653 */
grzemich 0:d7bd7384a37c 654 void
grzemich 0:d7bd7384a37c 655 igmp_tmr(void)
grzemich 0:d7bd7384a37c 656 {
grzemich 0:d7bd7384a37c 657 struct igmp_group *group = igmp_group_list;
grzemich 0:d7bd7384a37c 658
grzemich 0:d7bd7384a37c 659 while (group != NULL) {
grzemich 0:d7bd7384a37c 660 if (group->timer > 0) {
grzemich 0:d7bd7384a37c 661 group->timer--;
grzemich 0:d7bd7384a37c 662 if (group->timer == 0) {
grzemich 0:d7bd7384a37c 663 igmp_timeout(group);
grzemich 0:d7bd7384a37c 664 }
grzemich 0:d7bd7384a37c 665 }
grzemich 0:d7bd7384a37c 666 group = group->next;
grzemich 0:d7bd7384a37c 667 }
grzemich 0:d7bd7384a37c 668 }
grzemich 0:d7bd7384a37c 669
grzemich 0:d7bd7384a37c 670 /**
grzemich 0:d7bd7384a37c 671 * Called if a timeout for one group is reached.
grzemich 0:d7bd7384a37c 672 * Sends a report for this group.
grzemich 0:d7bd7384a37c 673 *
grzemich 0:d7bd7384a37c 674 * @param group an igmp_group for which a timeout is reached
grzemich 0:d7bd7384a37c 675 */
grzemich 0:d7bd7384a37c 676 static void
grzemich 0:d7bd7384a37c 677 igmp_timeout(struct igmp_group *group)
grzemich 0:d7bd7384a37c 678 {
grzemich 0:d7bd7384a37c 679 /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
grzemich 0:d7bd7384a37c 680 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
grzemich 0:d7bd7384a37c 681 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
grzemich 0:d7bd7384a37c 682 ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
grzemich 0:d7bd7384a37c 683 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
grzemich 0:d7bd7384a37c 684
grzemich 0:d7bd7384a37c 685 IGMP_STATS_INC(igmp.tx_report);
grzemich 0:d7bd7384a37c 686 igmp_send(group, IGMP_V2_MEMB_REPORT);
grzemich 0:d7bd7384a37c 687 }
grzemich 0:d7bd7384a37c 688 }
grzemich 0:d7bd7384a37c 689
grzemich 0:d7bd7384a37c 690 /**
grzemich 0:d7bd7384a37c 691 * Start a timer for an igmp group
grzemich 0:d7bd7384a37c 692 *
grzemich 0:d7bd7384a37c 693 * @param group the igmp_group for which to start a timer
grzemich 0:d7bd7384a37c 694 * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
grzemich 0:d7bd7384a37c 695 * every call to igmp_tmr())
grzemich 0:d7bd7384a37c 696 */
grzemich 0:d7bd7384a37c 697 static void
grzemich 0:d7bd7384a37c 698 igmp_start_timer(struct igmp_group *group, u8_t max_time)
grzemich 0:d7bd7384a37c 699 {
grzemich 0:d7bd7384a37c 700 /* ensure the input value is > 0 */
grzemich 0:d7bd7384a37c 701 if (max_time == 0) {
grzemich 0:d7bd7384a37c 702 max_time = 1;
grzemich 0:d7bd7384a37c 703 }
grzemich 0:d7bd7384a37c 704 /* ensure the random value is > 0 */
grzemich 0:d7bd7384a37c 705 group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
grzemich 0:d7bd7384a37c 706 }
grzemich 0:d7bd7384a37c 707
grzemich 0:d7bd7384a37c 708 /**
grzemich 0:d7bd7384a37c 709 * Delaying membership report for a group if necessary
grzemich 0:d7bd7384a37c 710 *
grzemich 0:d7bd7384a37c 711 * @param group the igmp_group for which "delaying" membership report
grzemich 0:d7bd7384a37c 712 * @param maxresp query delay
grzemich 0:d7bd7384a37c 713 */
grzemich 0:d7bd7384a37c 714 static void
grzemich 0:d7bd7384a37c 715 igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
grzemich 0:d7bd7384a37c 716 {
grzemich 0:d7bd7384a37c 717 if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
grzemich 0:d7bd7384a37c 718 ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
grzemich 0:d7bd7384a37c 719 ((group->timer == 0) || (maxresp < group->timer)))) {
grzemich 0:d7bd7384a37c 720 igmp_start_timer(group, maxresp);
grzemich 0:d7bd7384a37c 721 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
grzemich 0:d7bd7384a37c 722 }
grzemich 0:d7bd7384a37c 723 }
grzemich 0:d7bd7384a37c 724
grzemich 0:d7bd7384a37c 725
grzemich 0:d7bd7384a37c 726 /**
grzemich 0:d7bd7384a37c 727 * Sends an IP packet on a network interface. This function constructs the IP header
grzemich 0:d7bd7384a37c 728 * and calculates the IP header checksum. If the source IP address is NULL,
grzemich 0:d7bd7384a37c 729 * the IP address of the outgoing network interface is filled in as source address.
grzemich 0:d7bd7384a37c 730 *
grzemich 0:d7bd7384a37c 731 * @param p the packet to send (p->payload points to the data, e.g. next
grzemich 0:d7bd7384a37c 732 protocol header; if dest == IP_HDRINCL, p already includes an IP
grzemich 0:d7bd7384a37c 733 header and p->payload points to that IP header)
grzemich 0:d7bd7384a37c 734 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
grzemich 0:d7bd7384a37c 735 * IP address of the netif used to send is used as source address)
grzemich 0:d7bd7384a37c 736 * @param dest the destination IP address to send the packet to
grzemich 0:d7bd7384a37c 737 * @param ttl the TTL value to be set in the IP header
grzemich 0:d7bd7384a37c 738 * @param proto the PROTOCOL to be set in the IP header
grzemich 0:d7bd7384a37c 739 * @param netif the netif on which to send this packet
grzemich 0:d7bd7384a37c 740 * @return ERR_OK if the packet was sent OK
grzemich 0:d7bd7384a37c 741 * ERR_BUF if p doesn't have enough space for IP/LINK headers
grzemich 0:d7bd7384a37c 742 * returns errors returned by netif->output
grzemich 0:d7bd7384a37c 743 */
grzemich 0:d7bd7384a37c 744 static err_t
grzemich 0:d7bd7384a37c 745 igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif)
grzemich 0:d7bd7384a37c 746 {
grzemich 0:d7bd7384a37c 747 /* This is the "router alert" option */
grzemich 0:d7bd7384a37c 748 u16_t ra[2];
grzemich 0:d7bd7384a37c 749 ra[0] = PP_HTONS(ROUTER_ALERT);
grzemich 0:d7bd7384a37c 750 ra[1] = 0x0000; /* Router shall examine packet */
grzemich 0:d7bd7384a37c 751 IGMP_STATS_INC(igmp.xmit);
grzemich 0:d7bd7384a37c 752 return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
grzemich 0:d7bd7384a37c 753 }
grzemich 0:d7bd7384a37c 754
grzemich 0:d7bd7384a37c 755 /**
grzemich 0:d7bd7384a37c 756 * Send an igmp packet to a specific group.
grzemich 0:d7bd7384a37c 757 *
grzemich 0:d7bd7384a37c 758 * @param group the group to which to send the packet
grzemich 0:d7bd7384a37c 759 * @param type the type of igmp packet to send
grzemich 0:d7bd7384a37c 760 */
grzemich 0:d7bd7384a37c 761 static void
grzemich 0:d7bd7384a37c 762 igmp_send(struct igmp_group *group, u8_t type)
grzemich 0:d7bd7384a37c 763 {
grzemich 0:d7bd7384a37c 764 struct pbuf* p = NULL;
grzemich 0:d7bd7384a37c 765 struct igmp_msg* igmp = NULL;
grzemich 0:d7bd7384a37c 766 ip_addr_t src = *IP_ADDR_ANY;
grzemich 0:d7bd7384a37c 767 ip_addr_t* dest = NULL;
grzemich 0:d7bd7384a37c 768
grzemich 0:d7bd7384a37c 769 /* IP header + "router alert" option + IGMP header */
grzemich 0:d7bd7384a37c 770 p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
grzemich 0:d7bd7384a37c 771
grzemich 0:d7bd7384a37c 772 if (p) {
grzemich 0:d7bd7384a37c 773 igmp = (struct igmp_msg *)p->payload;
grzemich 0:d7bd7384a37c 774 LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
grzemich 0:d7bd7384a37c 775 (p->len >= sizeof(struct igmp_msg)));
grzemich 0:d7bd7384a37c 776 ip_addr_copy(src, group->netif->ip_addr);
grzemich 0:d7bd7384a37c 777
grzemich 0:d7bd7384a37c 778 if (type == IGMP_V2_MEMB_REPORT) {
grzemich 0:d7bd7384a37c 779 dest = &(group->group_address);
grzemich 0:d7bd7384a37c 780 ip_addr_copy(igmp->igmp_group_address, group->group_address);
grzemich 0:d7bd7384a37c 781 group->last_reporter_flag = 1; /* Remember we were the last to report */
grzemich 0:d7bd7384a37c 782 } else {
grzemich 0:d7bd7384a37c 783 if (type == IGMP_LEAVE_GROUP) {
grzemich 0:d7bd7384a37c 784 dest = &allrouters;
grzemich 0:d7bd7384a37c 785 ip_addr_copy(igmp->igmp_group_address, group->group_address);
grzemich 0:d7bd7384a37c 786 }
grzemich 0:d7bd7384a37c 787 }
grzemich 0:d7bd7384a37c 788
grzemich 0:d7bd7384a37c 789 if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
grzemich 0:d7bd7384a37c 790 igmp->igmp_msgtype = type;
grzemich 0:d7bd7384a37c 791 igmp->igmp_maxresp = 0;
grzemich 0:d7bd7384a37c 792 igmp->igmp_checksum = 0;
grzemich 0:d7bd7384a37c 793 igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
grzemich 0:d7bd7384a37c 794
grzemich 0:d7bd7384a37c 795 igmp_ip_output_if(p, &src, dest, group->netif);
grzemich 0:d7bd7384a37c 796 }
grzemich 0:d7bd7384a37c 797
grzemich 0:d7bd7384a37c 798 pbuf_free(p);
grzemich 0:d7bd7384a37c 799 } else {
grzemich 0:d7bd7384a37c 800 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
grzemich 0:d7bd7384a37c 801 IGMP_STATS_INC(igmp.memerr);
grzemich 0:d7bd7384a37c 802 }
grzemich 0:d7bd7384a37c 803 }
grzemich 0:d7bd7384a37c 804
grzemich 0:d7bd7384a37c 805 #endif /* LWIP_IGMP */