mbed unsupported / lwip

A version of LWIP, provided for backwards compatibility.

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trunk/Core/lwIP/core/ipv4/igmp.c@0:5e1631496985, 2012-05-08 (annotated)

Committer:
root@mbed.org
Date:
Tue May 08 15:32:10 2012 +0100
Revision:
0:5e1631496985
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
root@mbed.org 0:5e1631496985 1 /**
root@mbed.org 0:5e1631496985 2 * @file
root@mbed.org 0:5e1631496985 3 * IGMP - Internet Group Management Protocol
root@mbed.org 0:5e1631496985 4 *
root@mbed.org 0:5e1631496985 5 */
root@mbed.org 0:5e1631496985 6
root@mbed.org 0:5e1631496985 7 /*
root@mbed.org 0:5e1631496985 8 * Copyright (c) 2002 CITEL Technologies Ltd.
root@mbed.org 0:5e1631496985 9 * All rights reserved.
root@mbed.org 0:5e1631496985 10 *
root@mbed.org 0:5e1631496985 11 * Redistribution and use in source and binary forms, with or without
root@mbed.org 0:5e1631496985 12 * modification, are permitted provided that the following conditions
root@mbed.org 0:5e1631496985 13 * are met:
root@mbed.org 0:5e1631496985 14 * 1. Redistributions of source code must retain the above copyright
root@mbed.org 0:5e1631496985 15 * notice, this list of conditions and the following disclaimer.
root@mbed.org 0:5e1631496985 16 * 2. Redistributions in binary form must reproduce the above copyright
root@mbed.org 0:5e1631496985 17 * notice, this list of conditions and the following disclaimer in the
root@mbed.org 0:5e1631496985 18 * documentation and/or other materials provided with the distribution.
root@mbed.org 0:5e1631496985 19 * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
root@mbed.org 0:5e1631496985 20 * may be used to endorse or promote products derived from this software
root@mbed.org 0:5e1631496985 21 * without specific prior written permission.
root@mbed.org 0:5e1631496985 22 *
root@mbed.org 0:5e1631496985 23 * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
root@mbed.org 0:5e1631496985 24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
root@mbed.org 0:5e1631496985 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
root@mbed.org 0:5e1631496985 26 * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
root@mbed.org 0:5e1631496985 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
root@mbed.org 0:5e1631496985 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
root@mbed.org 0:5e1631496985 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
root@mbed.org 0:5e1631496985 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
root@mbed.org 0:5e1631496985 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
root@mbed.org 0:5e1631496985 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
root@mbed.org 0:5e1631496985 33 * SUCH DAMAGE.
root@mbed.org 0:5e1631496985 34 *
root@mbed.org 0:5e1631496985 35 * This file is a contribution to the lwIP TCP/IP stack.
root@mbed.org 0:5e1631496985 36 * The Swedish Institute of Computer Science and Adam Dunkels
root@mbed.org 0:5e1631496985 37 * are specifically granted permission to redistribute this
root@mbed.org 0:5e1631496985 38 * source code.
root@mbed.org 0:5e1631496985 39 */
root@mbed.org 0:5e1631496985 40
root@mbed.org 0:5e1631496985 41 /*-------------------------------------------------------------
root@mbed.org 0:5e1631496985 42 Note 1)
root@mbed.org 0:5e1631496985 43 Although the rfc requires V1 AND V2 capability
root@mbed.org 0:5e1631496985 44 we will only support v2 since now V1 is very old (August 1989)
root@mbed.org 0:5e1631496985 45 V1 can be added if required
root@mbed.org 0:5e1631496985 46
root@mbed.org 0:5e1631496985 47 a debug print and statistic have been implemented to
root@mbed.org 0:5e1631496985 48 show this up.
root@mbed.org 0:5e1631496985 49 -------------------------------------------------------------
root@mbed.org 0:5e1631496985 50 -------------------------------------------------------------
root@mbed.org 0:5e1631496985 51 Note 2)
root@mbed.org 0:5e1631496985 52 A query for a specific group address (as opposed to ALLHOSTS)
root@mbed.org 0:5e1631496985 53 has now been implemented as I am unsure if it is required
root@mbed.org 0:5e1631496985 54
root@mbed.org 0:5e1631496985 55 a debug print and statistic have been implemented to
root@mbed.org 0:5e1631496985 56 show this up.
root@mbed.org 0:5e1631496985 57 -------------------------------------------------------------
root@mbed.org 0:5e1631496985 58 -------------------------------------------------------------
root@mbed.org 0:5e1631496985 59 Note 3)
root@mbed.org 0:5e1631496985 60 The router alert rfc 2113 is implemented in outgoing packets
root@mbed.org 0:5e1631496985 61 but not checked rigorously incoming
root@mbed.org 0:5e1631496985 62 -------------------------------------------------------------
root@mbed.org 0:5e1631496985 63 Steve Reynolds
root@mbed.org 0:5e1631496985 64 ------------------------------------------------------------*/
root@mbed.org 0:5e1631496985 65
root@mbed.org 0:5e1631496985 66 /*-----------------------------------------------------------------------------
root@mbed.org 0:5e1631496985 67 * RFC 988 - Host extensions for IP multicasting - V0
root@mbed.org 0:5e1631496985 68 * RFC 1054 - Host extensions for IP multicasting -
root@mbed.org 0:5e1631496985 69 * RFC 1112 - Host extensions for IP multicasting - V1
root@mbed.org 0:5e1631496985 70 * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
root@mbed.org 0:5e1631496985 71 * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
root@mbed.org 0:5e1631496985 72 * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
root@mbed.org 0:5e1631496985 73 * RFC 2113 - IP Router Alert Option -
root@mbed.org 0:5e1631496985 74 *----------------------------------------------------------------------------*/
root@mbed.org 0:5e1631496985 75
root@mbed.org 0:5e1631496985 76 /*-----------------------------------------------------------------------------
root@mbed.org 0:5e1631496985 77 * Includes
root@mbed.org 0:5e1631496985 78 *----------------------------------------------------------------------------*/
root@mbed.org 0:5e1631496985 79
root@mbed.org 0:5e1631496985 80 #include "lwip/opt.h"
root@mbed.org 0:5e1631496985 81
root@mbed.org 0:5e1631496985 82 #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
root@mbed.org 0:5e1631496985 83
root@mbed.org 0:5e1631496985 84 #include "lwip/igmp.h"
root@mbed.org 0:5e1631496985 85 #include "lwip/debug.h"
root@mbed.org 0:5e1631496985 86 #include "lwip/def.h"
root@mbed.org 0:5e1631496985 87 #include "lwip/mem.h"
root@mbed.org 0:5e1631496985 88 #include "lwip/ip.h"
root@mbed.org 0:5e1631496985 89 #include "lwip/inet.h"
root@mbed.org 0:5e1631496985 90 #include "lwip/inet_chksum.h"
root@mbed.org 0:5e1631496985 91 #include "lwip/netif.h"
root@mbed.org 0:5e1631496985 92 #include "lwip/icmp.h"
root@mbed.org 0:5e1631496985 93 #include "lwip/udp.h"
root@mbed.org 0:5e1631496985 94 #include "lwip/tcp.h"
root@mbed.org 0:5e1631496985 95 #include "lwip/stats.h"
root@mbed.org 0:5e1631496985 96
root@mbed.org 0:5e1631496985 97 #include "string.h"
root@mbed.org 0:5e1631496985 98
root@mbed.org 0:5e1631496985 99 /*-----------------------------------------------------------------------------
root@mbed.org 0:5e1631496985 100 * Globales
root@mbed.org 0:5e1631496985 101 *----------------------------------------------------------------------------*/
root@mbed.org 0:5e1631496985 102
root@mbed.org 0:5e1631496985 103 static struct igmp_group* igmp_group_list;
root@mbed.org 0:5e1631496985 104 static struct ip_addr allsystems;
root@mbed.org 0:5e1631496985 105 static struct ip_addr allrouters;
root@mbed.org 0:5e1631496985 106
root@mbed.org 0:5e1631496985 107 /**
root@mbed.org 0:5e1631496985 108 * Initialize the IGMP module
root@mbed.org 0:5e1631496985 109 */
root@mbed.org 0:5e1631496985 110 void
root@mbed.org 0:5e1631496985 111 igmp_init(void)
root@mbed.org 0:5e1631496985 112 {
root@mbed.org 0:5e1631496985 113 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
root@mbed.org 0:5e1631496985 114
root@mbed.org 0:5e1631496985 115 IP4_ADDR(&allsystems, 224, 0, 0, 1);
root@mbed.org 0:5e1631496985 116 IP4_ADDR(&allrouters, 224, 0, 0, 2);
root@mbed.org 0:5e1631496985 117 }
root@mbed.org 0:5e1631496985 118
root@mbed.org 0:5e1631496985 119 #ifdef LWIP_DEBUG
root@mbed.org 0:5e1631496985 120 /**
root@mbed.org 0:5e1631496985 121 * Dump global IGMP groups list
root@mbed.org 0:5e1631496985 122 */
root@mbed.org 0:5e1631496985 123 void
root@mbed.org 0:5e1631496985 124 igmp_dump_group_list()
root@mbed.org 0:5e1631496985 125 {
root@mbed.org 0:5e1631496985 126 struct igmp_group *group = igmp_group_list;
root@mbed.org 0:5e1631496985 127
root@mbed.org 0:5e1631496985 128 while (group != NULL) {
root@mbed.org 0:5e1631496985 129 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
root@mbed.org 0:5e1631496985 130 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
root@mbed.org 0:5e1631496985 131 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->interface));
root@mbed.org 0:5e1631496985 132 group = group->next;
root@mbed.org 0:5e1631496985 133 }
root@mbed.org 0:5e1631496985 134 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
root@mbed.org 0:5e1631496985 135 }
root@mbed.org 0:5e1631496985 136 #else
root@mbed.org 0:5e1631496985 137 #define igmp_dump_group_list()
root@mbed.org 0:5e1631496985 138 #endif /* LWIP_DEBUG */
root@mbed.org 0:5e1631496985 139
root@mbed.org 0:5e1631496985 140 /**
root@mbed.org 0:5e1631496985 141 * Start IGMP processing on interface
root@mbed.org 0:5e1631496985 142 *
root@mbed.org 0:5e1631496985 143 * @param netif network interface on which start IGMP processing
root@mbed.org 0:5e1631496985 144 */
root@mbed.org 0:5e1631496985 145 err_t
root@mbed.org 0:5e1631496985 146 igmp_start(struct netif *netif)
root@mbed.org 0:5e1631496985 147 {
root@mbed.org 0:5e1631496985 148 struct igmp_group* group;
root@mbed.org 0:5e1631496985 149
root@mbed.org 0:5e1631496985 150 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
root@mbed.org 0:5e1631496985 151
root@mbed.org 0:5e1631496985 152 group = igmp_lookup_group(netif, &allsystems);
root@mbed.org 0:5e1631496985 153
root@mbed.org 0:5e1631496985 154 if (group != NULL) {
root@mbed.org 0:5e1631496985 155 group->group_state = IGMP_GROUP_IDLE_MEMBER;
root@mbed.org 0:5e1631496985 156 group->use++;
root@mbed.org 0:5e1631496985 157
root@mbed.org 0:5e1631496985 158 /* Allow the igmp messages at the MAC level */
root@mbed.org 0:5e1631496985 159 if (netif->igmp_mac_filter != NULL) {
root@mbed.org 0:5e1631496985 160 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
root@mbed.org 0:5e1631496985 161 ip_addr_debug_print(IGMP_DEBUG, &allsystems);
root@mbed.org 0:5e1631496985 162 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
root@mbed.org 0:5e1631496985 163 netif->igmp_mac_filter( netif, &allsystems, IGMP_ADD_MAC_FILTER);
root@mbed.org 0:5e1631496985 164 }
root@mbed.org 0:5e1631496985 165
root@mbed.org 0:5e1631496985 166 return ERR_OK;
root@mbed.org 0:5e1631496985 167 }
root@mbed.org 0:5e1631496985 168
root@mbed.org 0:5e1631496985 169 return ERR_MEM;
root@mbed.org 0:5e1631496985 170 }
root@mbed.org 0:5e1631496985 171
root@mbed.org 0:5e1631496985 172 /**
root@mbed.org 0:5e1631496985 173 * Stop IGMP processing on interface
root@mbed.org 0:5e1631496985 174 *
root@mbed.org 0:5e1631496985 175 * @param netif network interface on which stop IGMP processing
root@mbed.org 0:5e1631496985 176 */
root@mbed.org 0:5e1631496985 177 err_t
root@mbed.org 0:5e1631496985 178 igmp_stop(struct netif *netif)
root@mbed.org 0:5e1631496985 179 {
root@mbed.org 0:5e1631496985 180 struct igmp_group *group = igmp_group_list;
root@mbed.org 0:5e1631496985 181 struct igmp_group *prev = NULL;
root@mbed.org 0:5e1631496985 182 struct igmp_group *next;
root@mbed.org 0:5e1631496985 183
root@mbed.org 0:5e1631496985 184 /* look for groups joined on this interface further down the list */
root@mbed.org 0:5e1631496985 185 while (group != NULL) {
root@mbed.org 0:5e1631496985 186 next = group->next;
root@mbed.org 0:5e1631496985 187 /* is it a group joined on this interface? */
root@mbed.org 0:5e1631496985 188 if (group->interface == netif) {
root@mbed.org 0:5e1631496985 189 /* is it the first group of the list? */
root@mbed.org 0:5e1631496985 190 if (group == igmp_group_list) {
root@mbed.org 0:5e1631496985 191 igmp_group_list = next;
root@mbed.org 0:5e1631496985 192 }
root@mbed.org 0:5e1631496985 193 /* is there a "previous" group defined? */
root@mbed.org 0:5e1631496985 194 if (prev != NULL) {
root@mbed.org 0:5e1631496985 195 prev->next = next;
root@mbed.org 0:5e1631496985 196 }
root@mbed.org 0:5e1631496985 197 /* disable the group at the MAC level */
root@mbed.org 0:5e1631496985 198 if (netif->igmp_mac_filter != NULL) {
root@mbed.org 0:5e1631496985 199 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
root@mbed.org 0:5e1631496985 200 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
root@mbed.org 0:5e1631496985 201 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
root@mbed.org 0:5e1631496985 202 netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
root@mbed.org 0:5e1631496985 203 }
root@mbed.org 0:5e1631496985 204 /* free group */
root@mbed.org 0:5e1631496985 205 memp_free(MEMP_IGMP_GROUP, group);
root@mbed.org 0:5e1631496985 206 } else {
root@mbed.org 0:5e1631496985 207 /* change the "previous" */
root@mbed.org 0:5e1631496985 208 prev = group;
root@mbed.org 0:5e1631496985 209 }
root@mbed.org 0:5e1631496985 210 /* move to "next" */
root@mbed.org 0:5e1631496985 211 group = next;
root@mbed.org 0:5e1631496985 212 }
root@mbed.org 0:5e1631496985 213 return ERR_OK;
root@mbed.org 0:5e1631496985 214 }
root@mbed.org 0:5e1631496985 215
root@mbed.org 0:5e1631496985 216 /**
root@mbed.org 0:5e1631496985 217 * Report IGMP memberships for this interface
root@mbed.org 0:5e1631496985 218 *
root@mbed.org 0:5e1631496985 219 * @param netif network interface on which report IGMP memberships
root@mbed.org 0:5e1631496985 220 */
root@mbed.org 0:5e1631496985 221 void
root@mbed.org 0:5e1631496985 222 igmp_report_groups( struct netif *netif)
root@mbed.org 0:5e1631496985 223 {
root@mbed.org 0:5e1631496985 224 struct igmp_group *group = igmp_group_list;
root@mbed.org 0:5e1631496985 225
root@mbed.org 0:5e1631496985 226 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
root@mbed.org 0:5e1631496985 227
root@mbed.org 0:5e1631496985 228 while (group != NULL) {
root@mbed.org 0:5e1631496985 229 if (group->interface == netif) {
root@mbed.org 0:5e1631496985 230 igmp_delaying_member( group, IGMP_JOIN_DELAYING_MEMBER_TMR);
root@mbed.org 0:5e1631496985 231 }
root@mbed.org 0:5e1631496985 232 group = group->next;
root@mbed.org 0:5e1631496985 233 }
root@mbed.org 0:5e1631496985 234 }
root@mbed.org 0:5e1631496985 235
root@mbed.org 0:5e1631496985 236 /**
root@mbed.org 0:5e1631496985 237 * Search for a group in the global igmp_group_list
root@mbed.org 0:5e1631496985 238 *
root@mbed.org 0:5e1631496985 239 * @param ifp the network interface for which to look
root@mbed.org 0:5e1631496985 240 * @param addr the group ip address to search for
root@mbed.org 0:5e1631496985 241 * @return a struct igmp_group* if the group has been found,
root@mbed.org 0:5e1631496985 242 * NULL if the group wasn't found.
root@mbed.org 0:5e1631496985 243 */
root@mbed.org 0:5e1631496985 244 struct igmp_group *
root@mbed.org 0:5e1631496985 245 igmp_lookfor_group(struct netif *ifp, struct ip_addr *addr)
root@mbed.org 0:5e1631496985 246 {
root@mbed.org 0:5e1631496985 247 struct igmp_group *group = igmp_group_list;
root@mbed.org 0:5e1631496985 248
root@mbed.org 0:5e1631496985 249 while (group != NULL) {
root@mbed.org 0:5e1631496985 250 if ((group->interface == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
root@mbed.org 0:5e1631496985 251 return group;
root@mbed.org 0:5e1631496985 252 }
root@mbed.org 0:5e1631496985 253 group = group->next;
root@mbed.org 0:5e1631496985 254 }
root@mbed.org 0:5e1631496985 255
root@mbed.org 0:5e1631496985 256 /* to be clearer, we return NULL here instead of
root@mbed.org 0:5e1631496985 257 * 'group' (which is also NULL at this point).
root@mbed.org 0:5e1631496985 258 */
root@mbed.org 0:5e1631496985 259 return NULL;
root@mbed.org 0:5e1631496985 260 }
root@mbed.org 0:5e1631496985 261
root@mbed.org 0:5e1631496985 262 /**
root@mbed.org 0:5e1631496985 263 * Search for a specific igmp group and create a new one if not found-
root@mbed.org 0:5e1631496985 264 *
root@mbed.org 0:5e1631496985 265 * @param ifp the network interface for which to look
root@mbed.org 0:5e1631496985 266 * @param addr the group ip address to search
root@mbed.org 0:5e1631496985 267 * @return a struct igmp_group*,
root@mbed.org 0:5e1631496985 268 * NULL on memory error.
root@mbed.org 0:5e1631496985 269 */
root@mbed.org 0:5e1631496985 270 struct igmp_group *
root@mbed.org 0:5e1631496985 271 igmp_lookup_group(struct netif *ifp, struct ip_addr *addr)
root@mbed.org 0:5e1631496985 272 {
root@mbed.org 0:5e1631496985 273 struct igmp_group *group = igmp_group_list;
root@mbed.org 0:5e1631496985 274
root@mbed.org 0:5e1631496985 275 /* Search if the group already exists */
root@mbed.org 0:5e1631496985 276 group = igmp_lookfor_group(ifp, addr);
root@mbed.org 0:5e1631496985 277 if (group != NULL) {
root@mbed.org 0:5e1631496985 278 /* Group already exists. */
root@mbed.org 0:5e1631496985 279 return group;
root@mbed.org 0:5e1631496985 280 }
root@mbed.org 0:5e1631496985 281
root@mbed.org 0:5e1631496985 282 /* Group doesn't exist yet, create a new one */
root@mbed.org 0:5e1631496985 283 group = memp_malloc(MEMP_IGMP_GROUP);
root@mbed.org 0:5e1631496985 284 if (group != NULL) {
root@mbed.org 0:5e1631496985 285 group->interface = ifp;
root@mbed.org 0:5e1631496985 286 ip_addr_set(&(group->group_address), addr);
root@mbed.org 0:5e1631496985 287 group->timer = 0; /* Not running */
root@mbed.org 0:5e1631496985 288 group->group_state = IGMP_GROUP_NON_MEMBER;
root@mbed.org 0:5e1631496985 289 group->last_reporter_flag = 0;
root@mbed.org 0:5e1631496985 290 group->use = 0;
root@mbed.org 0:5e1631496985 291 group->next = igmp_group_list;
root@mbed.org 0:5e1631496985 292
root@mbed.org 0:5e1631496985 293 igmp_group_list = group;
root@mbed.org 0:5e1631496985 294 }
root@mbed.org 0:5e1631496985 295
root@mbed.org 0:5e1631496985 296 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
root@mbed.org 0:5e1631496985 297 ip_addr_debug_print(IGMP_DEBUG, addr);
root@mbed.org 0:5e1631496985 298 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
root@mbed.org 0:5e1631496985 299
root@mbed.org 0:5e1631496985 300 return group;
root@mbed.org 0:5e1631496985 301 }
root@mbed.org 0:5e1631496985 302
root@mbed.org 0:5e1631496985 303 /**
root@mbed.org 0:5e1631496985 304 * Remove a group in the global igmp_group_list
root@mbed.org 0:5e1631496985 305 *
root@mbed.org 0:5e1631496985 306 * @param group the group to remove from the global igmp_group_list
root@mbed.org 0:5e1631496985 307 * @return ERR_OK if group was removed from the list, an err_t otherwise
root@mbed.org 0:5e1631496985 308 */
root@mbed.org 0:5e1631496985 309 err_t
root@mbed.org 0:5e1631496985 310 igmp_remove_group(struct igmp_group *group)
root@mbed.org 0:5e1631496985 311 {
root@mbed.org 0:5e1631496985 312 err_t err = ERR_OK;
root@mbed.org 0:5e1631496985 313
root@mbed.org 0:5e1631496985 314 /* Is it the first group? */
root@mbed.org 0:5e1631496985 315 if (igmp_group_list == group) {
root@mbed.org 0:5e1631496985 316 igmp_group_list = group->next;
root@mbed.org 0:5e1631496985 317 } else {
root@mbed.org 0:5e1631496985 318 /* look for group further down the list */
root@mbed.org 0:5e1631496985 319 struct igmp_group *tmpGroup;
root@mbed.org 0:5e1631496985 320 for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
root@mbed.org 0:5e1631496985 321 if (tmpGroup->next == group) {
root@mbed.org 0:5e1631496985 322 tmpGroup->next = group->next;
root@mbed.org 0:5e1631496985 323 break;
root@mbed.org 0:5e1631496985 324 }
root@mbed.org 0:5e1631496985 325 }
root@mbed.org 0:5e1631496985 326 /* Group not found in the global igmp_group_list */
root@mbed.org 0:5e1631496985 327 if (tmpGroup == NULL)
root@mbed.org 0:5e1631496985 328 err = ERR_ARG;
root@mbed.org 0:5e1631496985 329 }
root@mbed.org 0:5e1631496985 330 /* free group */
root@mbed.org 0:5e1631496985 331 memp_free(MEMP_IGMP_GROUP, group);
root@mbed.org 0:5e1631496985 332
root@mbed.org 0:5e1631496985 333 return err;
root@mbed.org 0:5e1631496985 334 }
root@mbed.org 0:5e1631496985 335
root@mbed.org 0:5e1631496985 336 /**
root@mbed.org 0:5e1631496985 337 * Called from ip_input() if a new IGMP packet is received.
root@mbed.org 0:5e1631496985 338 *
root@mbed.org 0:5e1631496985 339 * @param p received igmp packet, p->payload pointing to the ip header
root@mbed.org 0:5e1631496985 340 * @param inp network interface on which the packet was received
root@mbed.org 0:5e1631496985 341 * @param dest destination ip address of the igmp packet
root@mbed.org 0:5e1631496985 342 */
root@mbed.org 0:5e1631496985 343 void
root@mbed.org 0:5e1631496985 344 igmp_input(struct pbuf *p, struct netif *inp, struct ip_addr *dest)
root@mbed.org 0:5e1631496985 345 {
root@mbed.org 0:5e1631496985 346 struct ip_hdr * iphdr;
root@mbed.org 0:5e1631496985 347 struct igmp_msg* igmp;
root@mbed.org 0:5e1631496985 348 struct igmp_group* group;
root@mbed.org 0:5e1631496985 349 struct igmp_group* groupref;
root@mbed.org 0:5e1631496985 350
root@mbed.org 0:5e1631496985 351 /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
root@mbed.org 0:5e1631496985 352 iphdr = p->payload;
root@mbed.org 0:5e1631496985 353 if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
root@mbed.org 0:5e1631496985 354 pbuf_free(p);
root@mbed.org 0:5e1631496985 355 IGMP_STATS_INC(igmp.lenerr);
root@mbed.org 0:5e1631496985 356 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
root@mbed.org 0:5e1631496985 357 return;
root@mbed.org 0:5e1631496985 358 }
root@mbed.org 0:5e1631496985 359
root@mbed.org 0:5e1631496985 360 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
root@mbed.org 0:5e1631496985 361 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
root@mbed.org 0:5e1631496985 362 LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
root@mbed.org 0:5e1631496985 363 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
root@mbed.org 0:5e1631496985 364 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
root@mbed.org 0:5e1631496985 365
root@mbed.org 0:5e1631496985 366 /* Now calculate and check the checksum */
root@mbed.org 0:5e1631496985 367 igmp = (struct igmp_msg *)p->payload;
root@mbed.org 0:5e1631496985 368 if (inet_chksum(igmp, p->len)) {
root@mbed.org 0:5e1631496985 369 pbuf_free(p);
root@mbed.org 0:5e1631496985 370 IGMP_STATS_INC(igmp.chkerr);
root@mbed.org 0:5e1631496985 371 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
root@mbed.org 0:5e1631496985 372 return;
root@mbed.org 0:5e1631496985 373 }
root@mbed.org 0:5e1631496985 374
root@mbed.org 0:5e1631496985 375 /* Packet is ok so find an existing group */
root@mbed.org 0:5e1631496985 376 group = igmp_lookfor_group(inp, dest); /* use the incoming IP address! */
root@mbed.org 0:5e1631496985 377
root@mbed.org 0:5e1631496985 378 /* If group can be found or create... */
root@mbed.org 0:5e1631496985 379 if (!group) {
root@mbed.org 0:5e1631496985 380 pbuf_free(p);
root@mbed.org 0:5e1631496985 381 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
root@mbed.org 0:5e1631496985 382 return;
root@mbed.org 0:5e1631496985 383 }
root@mbed.org 0:5e1631496985 384
root@mbed.org 0:5e1631496985 385 /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
root@mbed.org 0:5e1631496985 386 switch (igmp->igmp_msgtype) {
root@mbed.org 0:5e1631496985 387 case IGMP_MEMB_QUERY: {
root@mbed.org 0:5e1631496985 388 /* IGMP_MEMB_QUERY to the "all systems" address ? */
root@mbed.org 0:5e1631496985 389 if ((ip_addr_cmp(dest, &allsystems)) && (igmp->igmp_group_address.addr == 0)) {
root@mbed.org 0:5e1631496985 390 /* THIS IS THE GENERAL QUERY */
root@mbed.org 0:5e1631496985 391 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)));
root@mbed.org 0:5e1631496985 392
root@mbed.org 0:5e1631496985 393 if (igmp->igmp_maxresp == 0) {
root@mbed.org 0:5e1631496985 394 IGMP_STATS_INC(igmp.v1_rxed);
root@mbed.org 0:5e1631496985 395 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
root@mbed.org 0:5e1631496985 396 igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
root@mbed.org 0:5e1631496985 397 }
root@mbed.org 0:5e1631496985 398
root@mbed.org 0:5e1631496985 399 IGMP_STATS_INC(igmp.group_query_rxed);
root@mbed.org 0:5e1631496985 400 groupref = igmp_group_list;
root@mbed.org 0:5e1631496985 401 while (groupref) {
root@mbed.org 0:5e1631496985 402 /* Do not send messages on the all systems group address! */
root@mbed.org 0:5e1631496985 403 if ((groupref->interface == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
root@mbed.org 0:5e1631496985 404 igmp_delaying_member( groupref, igmp->igmp_maxresp);
root@mbed.org 0:5e1631496985 405 }
root@mbed.org 0:5e1631496985 406 groupref = groupref->next;
root@mbed.org 0:5e1631496985 407 }
root@mbed.org 0:5e1631496985 408 } else {
root@mbed.org 0:5e1631496985 409 /* IGMP_MEMB_QUERY to a specific group ? */
root@mbed.org 0:5e1631496985 410 if (group->group_address.addr != 0) {
root@mbed.org 0:5e1631496985 411 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
root@mbed.org 0:5e1631496985 412 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
root@mbed.org 0:5e1631496985 413 if (ip_addr_cmp (dest, &allsystems)) {
root@mbed.org 0:5e1631496985 414 LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
root@mbed.org 0:5e1631496985 415 /* we first need to re-lookfor the group since we used dest last time */
root@mbed.org 0:5e1631496985 416 group = igmp_lookfor_group(inp, &igmp->igmp_group_address);
root@mbed.org 0:5e1631496985 417 } else {
root@mbed.org 0:5e1631496985 418 LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
root@mbed.org 0:5e1631496985 419 }
root@mbed.org 0:5e1631496985 420
root@mbed.org 0:5e1631496985 421 if (group != NULL) {
root@mbed.org 0:5e1631496985 422 IGMP_STATS_INC(igmp.unicast_query);
root@mbed.org 0:5e1631496985 423 igmp_delaying_member( group, igmp->igmp_maxresp);
root@mbed.org 0:5e1631496985 424 }
root@mbed.org 0:5e1631496985 425 }
root@mbed.org 0:5e1631496985 426 }
root@mbed.org 0:5e1631496985 427 break;
root@mbed.org 0:5e1631496985 428 }
root@mbed.org 0:5e1631496985 429 case IGMP_V2_MEMB_REPORT: {
root@mbed.org 0:5e1631496985 430 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
root@mbed.org 0:5e1631496985 431
root@mbed.org 0:5e1631496985 432 IGMP_STATS_INC(igmp.report_rxed);
root@mbed.org 0:5e1631496985 433 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
root@mbed.org 0:5e1631496985 434 /* This is on a specific group we have already looked up */
root@mbed.org 0:5e1631496985 435 group->timer = 0; /* stopped */
root@mbed.org 0:5e1631496985 436 group->group_state = IGMP_GROUP_IDLE_MEMBER;
root@mbed.org 0:5e1631496985 437 group->last_reporter_flag = 0;
root@mbed.org 0:5e1631496985 438 }
root@mbed.org 0:5e1631496985 439 break;
root@mbed.org 0:5e1631496985 440 }
root@mbed.org 0:5e1631496985 441 default: {
root@mbed.org 0:5e1631496985 442 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
root@mbed.org 0:5e1631496985 443 igmp->igmp_msgtype, group->group_state, &group, group->interface));
root@mbed.org 0:5e1631496985 444 break;
root@mbed.org 0:5e1631496985 445 }
root@mbed.org 0:5e1631496985 446 }
root@mbed.org 0:5e1631496985 447
root@mbed.org 0:5e1631496985 448 pbuf_free(p);
root@mbed.org 0:5e1631496985 449 return;
root@mbed.org 0:5e1631496985 450 }
root@mbed.org 0:5e1631496985 451
root@mbed.org 0:5e1631496985 452 /**
root@mbed.org 0:5e1631496985 453 * Join a group on one network interface.
root@mbed.org 0:5e1631496985 454 *
root@mbed.org 0:5e1631496985 455 * @param ifaddr ip address of the network interface which should join a new group
root@mbed.org 0:5e1631496985 456 * @param groupaddr the ip address of the group which to join
root@mbed.org 0:5e1631496985 457 * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
root@mbed.org 0:5e1631496985 458 */
root@mbed.org 0:5e1631496985 459 err_t
root@mbed.org 0:5e1631496985 460 igmp_joingroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr)
root@mbed.org 0:5e1631496985 461 {
root@mbed.org 0:5e1631496985 462 err_t err = ERR_VAL; /* no matching interface */
root@mbed.org 0:5e1631496985 463 struct igmp_group *group;
root@mbed.org 0:5e1631496985 464 struct netif *netif;
root@mbed.org 0:5e1631496985 465
root@mbed.org 0:5e1631496985 466 /* make sure it is multicast address */
root@mbed.org 0:5e1631496985 467 LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
root@mbed.org 0:5e1631496985 468 LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
root@mbed.org 0:5e1631496985 469
root@mbed.org 0:5e1631496985 470 /* loop through netif's */
root@mbed.org 0:5e1631496985 471 netif = netif_list;
root@mbed.org 0:5e1631496985 472 while (netif != NULL) {
root@mbed.org 0:5e1631496985 473 /* Should we join this interface ? */
root@mbed.org 0:5e1631496985 474 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
root@mbed.org 0:5e1631496985 475 /* find group or create a new one if not found */
root@mbed.org 0:5e1631496985 476 group = igmp_lookup_group(netif, groupaddr);
root@mbed.org 0:5e1631496985 477
root@mbed.org 0:5e1631496985 478 if (group != NULL) {
root@mbed.org 0:5e1631496985 479 /* This should create a new group, check the state to make sure */
root@mbed.org 0:5e1631496985 480 if (group->group_state != IGMP_GROUP_NON_MEMBER) {
root@mbed.org 0:5e1631496985 481 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
root@mbed.org 0:5e1631496985 482 } else {
root@mbed.org 0:5e1631496985 483 /* OK - it was new group */
root@mbed.org 0:5e1631496985 484 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
root@mbed.org 0:5e1631496985 485 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
root@mbed.org 0:5e1631496985 486 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
root@mbed.org 0:5e1631496985 487
root@mbed.org 0:5e1631496985 488 /* If first use of the group, allow the group at the MAC level */
root@mbed.org 0:5e1631496985 489 if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
root@mbed.org 0:5e1631496985 490 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
root@mbed.org 0:5e1631496985 491 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
root@mbed.org 0:5e1631496985 492 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
root@mbed.org 0:5e1631496985 493 netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
root@mbed.org 0:5e1631496985 494 }
root@mbed.org 0:5e1631496985 495
root@mbed.org 0:5e1631496985 496 IGMP_STATS_INC(igmp.join_sent);
root@mbed.org 0:5e1631496985 497 igmp_send(group, IGMP_V2_MEMB_REPORT);
root@mbed.org 0:5e1631496985 498
root@mbed.org 0:5e1631496985 499 igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
root@mbed.org 0:5e1631496985 500
root@mbed.org 0:5e1631496985 501 /* Need to work out where this timer comes from */
root@mbed.org 0:5e1631496985 502 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
root@mbed.org 0:5e1631496985 503 }
root@mbed.org 0:5e1631496985 504 /* Increment group use */
root@mbed.org 0:5e1631496985 505 group->use++;
root@mbed.org 0:5e1631496985 506 /* Join on this interface */
root@mbed.org 0:5e1631496985 507 err = ERR_OK;
root@mbed.org 0:5e1631496985 508 } else {
root@mbed.org 0:5e1631496985 509 /* Return an error even if some network interfaces are joined */
root@mbed.org 0:5e1631496985 510 /** @todo undo any other netif already joined */
root@mbed.org 0:5e1631496985 511 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
root@mbed.org 0:5e1631496985 512 return ERR_MEM;
root@mbed.org 0:5e1631496985 513 }
root@mbed.org 0:5e1631496985 514 }
root@mbed.org 0:5e1631496985 515 /* proceed to next network interface */
root@mbed.org 0:5e1631496985 516 netif = netif->next;
root@mbed.org 0:5e1631496985 517 }
root@mbed.org 0:5e1631496985 518
root@mbed.org 0:5e1631496985 519 return err;
root@mbed.org 0:5e1631496985 520 }
root@mbed.org 0:5e1631496985 521
root@mbed.org 0:5e1631496985 522 /**
root@mbed.org 0:5e1631496985 523 * Leave a group on one network interface.
root@mbed.org 0:5e1631496985 524 *
root@mbed.org 0:5e1631496985 525 * @param ifaddr ip address of the network interface which should leave a group
root@mbed.org 0:5e1631496985 526 * @param groupaddr the ip address of the group which to leave
root@mbed.org 0:5e1631496985 527 * @return ERR_OK if group was left on the netif(s), an err_t otherwise
root@mbed.org 0:5e1631496985 528 */
root@mbed.org 0:5e1631496985 529 err_t
root@mbed.org 0:5e1631496985 530 igmp_leavegroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr)
root@mbed.org 0:5e1631496985 531 {
root@mbed.org 0:5e1631496985 532 err_t err = ERR_VAL; /* no matching interface */
root@mbed.org 0:5e1631496985 533 struct igmp_group *group;
root@mbed.org 0:5e1631496985 534 struct netif *netif;
root@mbed.org 0:5e1631496985 535
root@mbed.org 0:5e1631496985 536 /* make sure it is multicast address */
root@mbed.org 0:5e1631496985 537 LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
root@mbed.org 0:5e1631496985 538 LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
root@mbed.org 0:5e1631496985 539
root@mbed.org 0:5e1631496985 540 /* loop through netif's */
root@mbed.org 0:5e1631496985 541 netif = netif_list;
root@mbed.org 0:5e1631496985 542 while (netif != NULL) {
root@mbed.org 0:5e1631496985 543 /* Should we leave this interface ? */
root@mbed.org 0:5e1631496985 544 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
root@mbed.org 0:5e1631496985 545 /* find group */
root@mbed.org 0:5e1631496985 546 group = igmp_lookfor_group(netif, groupaddr);
root@mbed.org 0:5e1631496985 547
root@mbed.org 0:5e1631496985 548 if (group != NULL) {
root@mbed.org 0:5e1631496985 549 /* Only send a leave if the flag is set according to the state diagram */
root@mbed.org 0:5e1631496985 550 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
root@mbed.org 0:5e1631496985 551 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
root@mbed.org 0:5e1631496985 552 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
root@mbed.org 0:5e1631496985 553
root@mbed.org 0:5e1631496985 554 /* If there is no other use of the group */
root@mbed.org 0:5e1631496985 555 if (group->use <= 1) {
root@mbed.org 0:5e1631496985 556 /* If we are the last reporter for this group */
root@mbed.org 0:5e1631496985 557 if (group->last_reporter_flag) {
root@mbed.org 0:5e1631496985 558 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
root@mbed.org 0:5e1631496985 559 IGMP_STATS_INC(igmp.leave_sent);
root@mbed.org 0:5e1631496985 560 igmp_send(group, IGMP_LEAVE_GROUP);
root@mbed.org 0:5e1631496985 561 }
root@mbed.org 0:5e1631496985 562
root@mbed.org 0:5e1631496985 563 /* Disable the group at the MAC level */
root@mbed.org 0:5e1631496985 564 if (netif->igmp_mac_filter != NULL) {
root@mbed.org 0:5e1631496985 565 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
root@mbed.org 0:5e1631496985 566 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
root@mbed.org 0:5e1631496985 567 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
root@mbed.org 0:5e1631496985 568 netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
root@mbed.org 0:5e1631496985 569 }
root@mbed.org 0:5e1631496985 570
root@mbed.org 0:5e1631496985 571 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
root@mbed.org 0:5e1631496985 572 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
root@mbed.org 0:5e1631496985 573 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
root@mbed.org 0:5e1631496985 574
root@mbed.org 0:5e1631496985 575 /* Free the group */
root@mbed.org 0:5e1631496985 576 igmp_remove_group(group);
root@mbed.org 0:5e1631496985 577 } else {
root@mbed.org 0:5e1631496985 578 /* Decrement group use */
root@mbed.org 0:5e1631496985 579 group->use--;
root@mbed.org 0:5e1631496985 580 }
root@mbed.org 0:5e1631496985 581 /* Leave on this interface */
root@mbed.org 0:5e1631496985 582 err = ERR_OK;
root@mbed.org 0:5e1631496985 583 } else {
root@mbed.org 0:5e1631496985 584 /* It's not a fatal error on "leavegroup" */
root@mbed.org 0:5e1631496985 585 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
root@mbed.org 0:5e1631496985 586 }
root@mbed.org 0:5e1631496985 587 }
root@mbed.org 0:5e1631496985 588 /* proceed to next network interface */
root@mbed.org 0:5e1631496985 589 netif = netif->next;
root@mbed.org 0:5e1631496985 590 }
root@mbed.org 0:5e1631496985 591
root@mbed.org 0:5e1631496985 592 return err;
root@mbed.org 0:5e1631496985 593 }
root@mbed.org 0:5e1631496985 594
root@mbed.org 0:5e1631496985 595 /**
root@mbed.org 0:5e1631496985 596 * The igmp timer function (both for NO_SYS=1 and =0)
root@mbed.org 0:5e1631496985 597 * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
root@mbed.org 0:5e1631496985 598 */
root@mbed.org 0:5e1631496985 599 void
root@mbed.org 0:5e1631496985 600 igmp_tmr(void)
root@mbed.org 0:5e1631496985 601 {
root@mbed.org 0:5e1631496985 602 struct igmp_group *group = igmp_group_list;
root@mbed.org 0:5e1631496985 603
root@mbed.org 0:5e1631496985 604 while (group != NULL) {
root@mbed.org 0:5e1631496985 605 if (group->timer != 0) {
root@mbed.org 0:5e1631496985 606 group->timer -= 1;
root@mbed.org 0:5e1631496985 607 if (group->timer == 0) {
root@mbed.org 0:5e1631496985 608 igmp_timeout(group);
root@mbed.org 0:5e1631496985 609 }
root@mbed.org 0:5e1631496985 610 }
root@mbed.org 0:5e1631496985 611 group = group->next;
root@mbed.org 0:5e1631496985 612 }
root@mbed.org 0:5e1631496985 613 }
root@mbed.org 0:5e1631496985 614
root@mbed.org 0:5e1631496985 615 /**
root@mbed.org 0:5e1631496985 616 * Called if a timeout for one group is reached.
root@mbed.org 0:5e1631496985 617 * Sends a report for this group.
root@mbed.org 0:5e1631496985 618 *
root@mbed.org 0:5e1631496985 619 * @param group an igmp_group for which a timeout is reached
root@mbed.org 0:5e1631496985 620 */
root@mbed.org 0:5e1631496985 621 void
root@mbed.org 0:5e1631496985 622 igmp_timeout(struct igmp_group *group)
root@mbed.org 0:5e1631496985 623 {
root@mbed.org 0:5e1631496985 624 /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
root@mbed.org 0:5e1631496985 625 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
root@mbed.org 0:5e1631496985 626 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
root@mbed.org 0:5e1631496985 627 ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
root@mbed.org 0:5e1631496985 628 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->interface));
root@mbed.org 0:5e1631496985 629
root@mbed.org 0:5e1631496985 630 igmp_send(group, IGMP_V2_MEMB_REPORT);
root@mbed.org 0:5e1631496985 631 }
root@mbed.org 0:5e1631496985 632 }
root@mbed.org 0:5e1631496985 633
root@mbed.org 0:5e1631496985 634 /**
root@mbed.org 0:5e1631496985 635 * Start a timer for an igmp group
root@mbed.org 0:5e1631496985 636 *
root@mbed.org 0:5e1631496985 637 * @param group the igmp_group for which to start a timer
root@mbed.org 0:5e1631496985 638 * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
root@mbed.org 0:5e1631496985 639 * every call to igmp_tmr())
root@mbed.org 0:5e1631496985 640 */
root@mbed.org 0:5e1631496985 641 void
root@mbed.org 0:5e1631496985 642 igmp_start_timer(struct igmp_group *group, u8_t max_time)
root@mbed.org 0:5e1631496985 643 {
root@mbed.org 0:5e1631496985 644 /**
root@mbed.org 0:5e1631496985 645 * @todo Important !! this should be random 0 -> max_time. Find out how to do this
root@mbed.org 0:5e1631496985 646 */
root@mbed.org 0:5e1631496985 647 group->timer = max_time;
root@mbed.org 0:5e1631496985 648 }
root@mbed.org 0:5e1631496985 649
root@mbed.org 0:5e1631496985 650 /**
root@mbed.org 0:5e1631496985 651 * Stop a timer for an igmp_group
root@mbed.org 0:5e1631496985 652 *
root@mbed.org 0:5e1631496985 653 * @param group the igmp_group for which to stop the timer
root@mbed.org 0:5e1631496985 654 */
root@mbed.org 0:5e1631496985 655 void
root@mbed.org 0:5e1631496985 656 igmp_stop_timer(struct igmp_group *group)
root@mbed.org 0:5e1631496985 657 {
root@mbed.org 0:5e1631496985 658 group->timer = 0;
root@mbed.org 0:5e1631496985 659 }
root@mbed.org 0:5e1631496985 660
root@mbed.org 0:5e1631496985 661 /**
root@mbed.org 0:5e1631496985 662 * Delaying membership report for a group if necessary
root@mbed.org 0:5e1631496985 663 *
root@mbed.org 0:5e1631496985 664 * @param group the igmp_group for which "delaying" membership report
root@mbed.org 0:5e1631496985 665 * @param maxresp query delay
root@mbed.org 0:5e1631496985 666 */
root@mbed.org 0:5e1631496985 667 void
root@mbed.org 0:5e1631496985 668 igmp_delaying_member( struct igmp_group *group, u8_t maxresp)
root@mbed.org 0:5e1631496985 669 {
root@mbed.org 0:5e1631496985 670 if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
root@mbed.org 0:5e1631496985 671 ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) && (maxresp > group->timer))) {
root@mbed.org 0:5e1631496985 672 igmp_start_timer(group, (maxresp)/2);
root@mbed.org 0:5e1631496985 673 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
root@mbed.org 0:5e1631496985 674 }
root@mbed.org 0:5e1631496985 675 }
root@mbed.org 0:5e1631496985 676
root@mbed.org 0:5e1631496985 677
root@mbed.org 0:5e1631496985 678 /**
root@mbed.org 0:5e1631496985 679 * Sends an IP packet on a network interface. This function constructs the IP header
root@mbed.org 0:5e1631496985 680 * and calculates the IP header checksum. If the source IP address is NULL,
root@mbed.org 0:5e1631496985 681 * the IP address of the outgoing network interface is filled in as source address.
root@mbed.org 0:5e1631496985 682 *
root@mbed.org 0:5e1631496985 683 * @param p the packet to send (p->payload points to the data, e.g. next
root@mbed.org 0:5e1631496985 684 protocol header; if dest == IP_HDRINCL, p already includes an IP
root@mbed.org 0:5e1631496985 685 header and p->payload points to that IP header)
root@mbed.org 0:5e1631496985 686 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
root@mbed.org 0:5e1631496985 687 * IP address of the netif used to send is used as source address)
root@mbed.org 0:5e1631496985 688 * @param dest the destination IP address to send the packet to
root@mbed.org 0:5e1631496985 689 * @param ttl the TTL value to be set in the IP header
root@mbed.org 0:5e1631496985 690 * @param proto the PROTOCOL to be set in the IP header
root@mbed.org 0:5e1631496985 691 * @param netif the netif on which to send this packet
root@mbed.org 0:5e1631496985 692 * @return ERR_OK if the packet was sent OK
root@mbed.org 0:5e1631496985 693 * ERR_BUF if p doesn't have enough space for IP/LINK headers
root@mbed.org 0:5e1631496985 694 * returns errors returned by netif->output
root@mbed.org 0:5e1631496985 695 */
root@mbed.org 0:5e1631496985 696 err_t
root@mbed.org 0:5e1631496985 697 igmp_ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
root@mbed.org 0:5e1631496985 698 u8_t ttl, u8_t proto, struct netif *netif)
root@mbed.org 0:5e1631496985 699 {
root@mbed.org 0:5e1631496985 700 /* This is the "router alert" option */
root@mbed.org 0:5e1631496985 701 u16_t ra[2];
root@mbed.org 0:5e1631496985 702 ra[0] = htons (ROUTER_ALERT);
root@mbed.org 0:5e1631496985 703 ra[1] = 0x0000; /* Router shall examine packet */
root@mbed.org 0:5e1631496985 704 return ip_output_if_opt(p, src, dest, ttl, 0, proto, netif, ra, ROUTER_ALERTLEN);
root@mbed.org 0:5e1631496985 705 }
root@mbed.org 0:5e1631496985 706
root@mbed.org 0:5e1631496985 707 /**
root@mbed.org 0:5e1631496985 708 * Send an igmp packet to a specific group.
root@mbed.org 0:5e1631496985 709 *
root@mbed.org 0:5e1631496985 710 * @param group the group to which to send the packet
root@mbed.org 0:5e1631496985 711 * @param type the type of igmp packet to send
root@mbed.org 0:5e1631496985 712 */
root@mbed.org 0:5e1631496985 713 void
root@mbed.org 0:5e1631496985 714 igmp_send(struct igmp_group *group, u8_t type)
root@mbed.org 0:5e1631496985 715 {
root@mbed.org 0:5e1631496985 716 struct pbuf* p = NULL;
root@mbed.org 0:5e1631496985 717 struct igmp_msg* igmp = NULL;
root@mbed.org 0:5e1631496985 718 struct ip_addr src = {0};
root@mbed.org 0:5e1631496985 719 struct ip_addr* dest = NULL;
root@mbed.org 0:5e1631496985 720
root@mbed.org 0:5e1631496985 721 /* IP header + "router alert" option + IGMP header */
root@mbed.org 0:5e1631496985 722 p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
root@mbed.org 0:5e1631496985 723
root@mbed.org 0:5e1631496985 724 if (p) {
root@mbed.org 0:5e1631496985 725 igmp = p->payload;
root@mbed.org 0:5e1631496985 726 LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
root@mbed.org 0:5e1631496985 727 (p->len >= sizeof(struct igmp_msg)));
root@mbed.org 0:5e1631496985 728 ip_addr_set(&src, &((group->interface)->ip_addr));
root@mbed.org 0:5e1631496985 729
root@mbed.org 0:5e1631496985 730 if (type == IGMP_V2_MEMB_REPORT) {
root@mbed.org 0:5e1631496985 731 dest = &(group->group_address);
root@mbed.org 0:5e1631496985 732 IGMP_STATS_INC(igmp.report_sent);
root@mbed.org 0:5e1631496985 733 ip_addr_set(&(igmp->igmp_group_address), &(group->group_address));
root@mbed.org 0:5e1631496985 734 group->last_reporter_flag = 1; /* Remember we were the last to report */
root@mbed.org 0:5e1631496985 735 } else {
root@mbed.org 0:5e1631496985 736 if (type == IGMP_LEAVE_GROUP) {
root@mbed.org 0:5e1631496985 737 dest = &allrouters;
root@mbed.org 0:5e1631496985 738 ip_addr_set(&(igmp->igmp_group_address), &(group->group_address));
root@mbed.org 0:5e1631496985 739 }
root@mbed.org 0:5e1631496985 740 }
root@mbed.org 0:5e1631496985 741
root@mbed.org 0:5e1631496985 742 if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
root@mbed.org 0:5e1631496985 743 igmp->igmp_msgtype = type;
root@mbed.org 0:5e1631496985 744 igmp->igmp_maxresp = 0;
root@mbed.org 0:5e1631496985 745 igmp->igmp_checksum = 0;
root@mbed.org 0:5e1631496985 746 igmp->igmp_checksum = inet_chksum( igmp, IGMP_MINLEN);
root@mbed.org 0:5e1631496985 747
root@mbed.org 0:5e1631496985 748 igmp_ip_output_if(p, &src, dest, IGMP_TTL, IP_PROTO_IGMP, group->interface);
root@mbed.org 0:5e1631496985 749 }
root@mbed.org 0:5e1631496985 750
root@mbed.org 0:5e1631496985 751 pbuf_free(p);
root@mbed.org 0:5e1631496985 752 } else {
root@mbed.org 0:5e1631496985 753 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
root@mbed.org 0:5e1631496985 754 }
root@mbed.org 0:5e1631496985 755 }
root@mbed.org 0:5e1631496985 756
root@mbed.org 0:5e1631496985 757 #endif /* LWIP_IGMP */