Mihail Stoyanov / HTTPServer

My fork of the HTTPServer (working)

Dependents:   DGWWebServer LAN2

Core/lwIP/core/ipv4/igmp.c@1:284f2df30cf9, 2012-11-20 (annotated)

Committer:
screamer
Date:
Tue Nov 20 12:18:53 2012 +0000
Revision:
1:284f2df30cf9
Parent:
0:7a64fbb4069d 
local changes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
screamer 0:7a64fbb4069d 1 /**
screamer 0:7a64fbb4069d 2 * @file
screamer 0:7a64fbb4069d 3 * IGMP - Internet Group Management Protocol
screamer 0:7a64fbb4069d 4 *
screamer 0:7a64fbb4069d 5 */
screamer 0:7a64fbb4069d 6
screamer 0:7a64fbb4069d 7 /*
screamer 0:7a64fbb4069d 8 * Copyright (c) 2002 CITEL Technologies Ltd.
screamer 0:7a64fbb4069d 9 * All rights reserved.
screamer 0:7a64fbb4069d 10 *
screamer 0:7a64fbb4069d 11 * Redistribution and use in source and binary forms, with or without
screamer 0:7a64fbb4069d 12 * modification, are permitted provided that the following conditions
screamer 0:7a64fbb4069d 13 * are met:
screamer 0:7a64fbb4069d 14 * 1. Redistributions of source code must retain the above copyright
screamer 0:7a64fbb4069d 15 * notice, this list of conditions and the following disclaimer.
screamer 0:7a64fbb4069d 16 * 2. Redistributions in binary form must reproduce the above copyright
screamer 0:7a64fbb4069d 17 * notice, this list of conditions and the following disclaimer in the
screamer 0:7a64fbb4069d 18 * documentation and/or other materials provided with the distribution.
screamer 0:7a64fbb4069d 19 * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
screamer 0:7a64fbb4069d 20 * may be used to endorse or promote products derived from this software
screamer 0:7a64fbb4069d 21 * without specific prior written permission.
screamer 0:7a64fbb4069d 22 *
screamer 0:7a64fbb4069d 23 * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
screamer 0:7a64fbb4069d 24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
screamer 0:7a64fbb4069d 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
screamer 0:7a64fbb4069d 26 * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
screamer 0:7a64fbb4069d 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
screamer 0:7a64fbb4069d 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
screamer 0:7a64fbb4069d 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
screamer 0:7a64fbb4069d 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
screamer 0:7a64fbb4069d 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
screamer 0:7a64fbb4069d 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
screamer 0:7a64fbb4069d 33 * SUCH DAMAGE.
screamer 0:7a64fbb4069d 34 *
screamer 0:7a64fbb4069d 35 * This file is a contribution to the lwIP TCP/IP stack.
screamer 0:7a64fbb4069d 36 * The Swedish Institute of Computer Science and Adam Dunkels
screamer 0:7a64fbb4069d 37 * are specifically granted permission to redistribute this
screamer 0:7a64fbb4069d 38 * source code.
screamer 0:7a64fbb4069d 39 */
screamer 0:7a64fbb4069d 40
screamer 0:7a64fbb4069d 41 /*-------------------------------------------------------------
screamer 0:7a64fbb4069d 42 Note 1)
screamer 0:7a64fbb4069d 43 Although the rfc requires V1 AND V2 capability
screamer 0:7a64fbb4069d 44 we will only support v2 since now V1 is very old (August 1989)
screamer 0:7a64fbb4069d 45 V1 can be added if required
screamer 0:7a64fbb4069d 46
screamer 0:7a64fbb4069d 47 a debug print and statistic have been implemented to
screamer 0:7a64fbb4069d 48 show this up.
screamer 0:7a64fbb4069d 49 -------------------------------------------------------------
screamer 0:7a64fbb4069d 50 -------------------------------------------------------------
screamer 0:7a64fbb4069d 51 Note 2)
screamer 0:7a64fbb4069d 52 A query for a specific group address (as opposed to ALLHOSTS)
screamer 0:7a64fbb4069d 53 has now been implemented as I am unsure if it is required
screamer 0:7a64fbb4069d 54
screamer 0:7a64fbb4069d 55 a debug print and statistic have been implemented to
screamer 0:7a64fbb4069d 56 show this up.
screamer 0:7a64fbb4069d 57 -------------------------------------------------------------
screamer 0:7a64fbb4069d 58 -------------------------------------------------------------
screamer 0:7a64fbb4069d 59 Note 3)
screamer 0:7a64fbb4069d 60 The router alert rfc 2113 is implemented in outgoing packets
screamer 0:7a64fbb4069d 61 but not checked rigorously incoming
screamer 0:7a64fbb4069d 62 -------------------------------------------------------------
screamer 0:7a64fbb4069d 63 Steve Reynolds
screamer 0:7a64fbb4069d 64 ------------------------------------------------------------*/
screamer 0:7a64fbb4069d 65
screamer 0:7a64fbb4069d 66 /*-----------------------------------------------------------------------------
screamer 0:7a64fbb4069d 67 * RFC 988 - Host extensions for IP multicasting - V0
screamer 0:7a64fbb4069d 68 * RFC 1054 - Host extensions for IP multicasting -
screamer 0:7a64fbb4069d 69 * RFC 1112 - Host extensions for IP multicasting - V1
screamer 0:7a64fbb4069d 70 * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
screamer 0:7a64fbb4069d 71 * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
screamer 0:7a64fbb4069d 72 * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
screamer 0:7a64fbb4069d 73 * RFC 2113 - IP Router Alert Option -
screamer 0:7a64fbb4069d 74 *----------------------------------------------------------------------------*/
screamer 0:7a64fbb4069d 75
screamer 0:7a64fbb4069d 76 /*-----------------------------------------------------------------------------
screamer 0:7a64fbb4069d 77 * Includes
screamer 0:7a64fbb4069d 78 *----------------------------------------------------------------------------*/
screamer 0:7a64fbb4069d 79
screamer 0:7a64fbb4069d 80 #include "lwip/opt.h"
screamer 0:7a64fbb4069d 81
screamer 0:7a64fbb4069d 82 #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
screamer 0:7a64fbb4069d 83
screamer 0:7a64fbb4069d 84 #include "lwip/igmp.h"
screamer 0:7a64fbb4069d 85 #include "lwip/debug.h"
screamer 0:7a64fbb4069d 86 #include "lwip/def.h"
screamer 0:7a64fbb4069d 87 #include "lwip/mem.h"
screamer 0:7a64fbb4069d 88 #include "lwip/ip.h"
screamer 0:7a64fbb4069d 89 #include "lwip/inet.h"
screamer 0:7a64fbb4069d 90 #include "lwip/inet_chksum.h"
screamer 0:7a64fbb4069d 91 #include "lwip/netif.h"
screamer 0:7a64fbb4069d 92 #include "lwip/icmp.h"
screamer 0:7a64fbb4069d 93 #include "lwip/udp.h"
screamer 0:7a64fbb4069d 94 #include "lwip/tcp.h"
screamer 0:7a64fbb4069d 95 #include "lwip/stats.h"
screamer 0:7a64fbb4069d 96
screamer 0:7a64fbb4069d 97 #include "string.h"
screamer 0:7a64fbb4069d 98
screamer 0:7a64fbb4069d 99 /*-----------------------------------------------------------------------------
screamer 0:7a64fbb4069d 100 * Globales
screamer 0:7a64fbb4069d 101 *----------------------------------------------------------------------------*/
screamer 0:7a64fbb4069d 102
screamer 0:7a64fbb4069d 103 static struct igmp_group* igmp_group_list;
screamer 0:7a64fbb4069d 104 static struct ip_addr allsystems;
screamer 0:7a64fbb4069d 105 static struct ip_addr allrouters;
screamer 0:7a64fbb4069d 106
screamer 0:7a64fbb4069d 107 /**
screamer 0:7a64fbb4069d 108 * Initialize the IGMP module
screamer 0:7a64fbb4069d 109 */
screamer 0:7a64fbb4069d 110 void
screamer 0:7a64fbb4069d 111 igmp_init(void)
screamer 0:7a64fbb4069d 112 {
screamer 0:7a64fbb4069d 113 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
screamer 0:7a64fbb4069d 114
screamer 0:7a64fbb4069d 115 IP4_ADDR(&allsystems, 224, 0, 0, 1);
screamer 0:7a64fbb4069d 116 IP4_ADDR(&allrouters, 224, 0, 0, 2);
screamer 0:7a64fbb4069d 117 }
screamer 0:7a64fbb4069d 118
screamer 0:7a64fbb4069d 119 #ifdef LWIP_DEBUG
screamer 0:7a64fbb4069d 120 /**
screamer 0:7a64fbb4069d 121 * Dump global IGMP groups list
screamer 0:7a64fbb4069d 122 */
screamer 0:7a64fbb4069d 123 void
screamer 0:7a64fbb4069d 124 igmp_dump_group_list()
screamer 0:7a64fbb4069d 125 {
screamer 0:7a64fbb4069d 126 struct igmp_group *group = igmp_group_list;
screamer 0:7a64fbb4069d 127
screamer 0:7a64fbb4069d 128 while (group != NULL) {
screamer 0:7a64fbb4069d 129 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
screamer 0:7a64fbb4069d 130 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
screamer 0:7a64fbb4069d 131 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->interface));
screamer 0:7a64fbb4069d 132 group = group->next;
screamer 0:7a64fbb4069d 133 }
screamer 0:7a64fbb4069d 134 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
screamer 0:7a64fbb4069d 135 }
screamer 0:7a64fbb4069d 136 #else
screamer 0:7a64fbb4069d 137 #define igmp_dump_group_list()
screamer 0:7a64fbb4069d 138 #endif /* LWIP_DEBUG */
screamer 0:7a64fbb4069d 139
screamer 0:7a64fbb4069d 140 /**
screamer 0:7a64fbb4069d 141 * Start IGMP processing on interface
screamer 0:7a64fbb4069d 142 *
screamer 0:7a64fbb4069d 143 * @param netif network interface on which start IGMP processing
screamer 0:7a64fbb4069d 144 */
screamer 0:7a64fbb4069d 145 err_t
screamer 0:7a64fbb4069d 146 igmp_start(struct netif *netif)
screamer 0:7a64fbb4069d 147 {
screamer 0:7a64fbb4069d 148 struct igmp_group* group;
screamer 0:7a64fbb4069d 149
screamer 0:7a64fbb4069d 150 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
screamer 0:7a64fbb4069d 151
screamer 0:7a64fbb4069d 152 group = igmp_lookup_group(netif, &allsystems);
screamer 0:7a64fbb4069d 153
screamer 0:7a64fbb4069d 154 if (group != NULL) {
screamer 0:7a64fbb4069d 155 group->group_state = IGMP_GROUP_IDLE_MEMBER;
screamer 0:7a64fbb4069d 156 group->use++;
screamer 0:7a64fbb4069d 157
screamer 0:7a64fbb4069d 158 /* Allow the igmp messages at the MAC level */
screamer 0:7a64fbb4069d 159 if (netif->igmp_mac_filter != NULL) {
screamer 0:7a64fbb4069d 160 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
screamer 0:7a64fbb4069d 161 ip_addr_debug_print(IGMP_DEBUG, &allsystems);
screamer 0:7a64fbb4069d 162 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
screamer 0:7a64fbb4069d 163 netif->igmp_mac_filter( netif, &allsystems, IGMP_ADD_MAC_FILTER);
screamer 0:7a64fbb4069d 164 }
screamer 0:7a64fbb4069d 165
screamer 0:7a64fbb4069d 166 return ERR_OK;
screamer 0:7a64fbb4069d 167 }
screamer 0:7a64fbb4069d 168
screamer 0:7a64fbb4069d 169 return ERR_MEM;
screamer 0:7a64fbb4069d 170 }
screamer 0:7a64fbb4069d 171
screamer 0:7a64fbb4069d 172 /**
screamer 0:7a64fbb4069d 173 * Stop IGMP processing on interface
screamer 0:7a64fbb4069d 174 *
screamer 0:7a64fbb4069d 175 * @param netif network interface on which stop IGMP processing
screamer 0:7a64fbb4069d 176 */
screamer 0:7a64fbb4069d 177 err_t
screamer 0:7a64fbb4069d 178 igmp_stop(struct netif *netif)
screamer 0:7a64fbb4069d 179 {
screamer 0:7a64fbb4069d 180 struct igmp_group *group = igmp_group_list;
screamer 0:7a64fbb4069d 181 struct igmp_group *prev = NULL;
screamer 0:7a64fbb4069d 182 struct igmp_group *next;
screamer 0:7a64fbb4069d 183
screamer 0:7a64fbb4069d 184 /* look for groups joined on this interface further down the list */
screamer 0:7a64fbb4069d 185 while (group != NULL) {
screamer 0:7a64fbb4069d 186 next = group->next;
screamer 0:7a64fbb4069d 187 /* is it a group joined on this interface? */
screamer 0:7a64fbb4069d 188 if (group->interface == netif) {
screamer 0:7a64fbb4069d 189 /* is it the first group of the list? */
screamer 0:7a64fbb4069d 190 if (group == igmp_group_list) {
screamer 0:7a64fbb4069d 191 igmp_group_list = next;
screamer 0:7a64fbb4069d 192 }
screamer 0:7a64fbb4069d 193 /* is there a "previous" group defined? */
screamer 0:7a64fbb4069d 194 if (prev != NULL) {
screamer 0:7a64fbb4069d 195 prev->next = next;
screamer 0:7a64fbb4069d 196 }
screamer 0:7a64fbb4069d 197 /* disable the group at the MAC level */
screamer 0:7a64fbb4069d 198 if (netif->igmp_mac_filter != NULL) {
screamer 0:7a64fbb4069d 199 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
screamer 0:7a64fbb4069d 200 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
screamer 0:7a64fbb4069d 201 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
screamer 0:7a64fbb4069d 202 netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
screamer 0:7a64fbb4069d 203 }
screamer 0:7a64fbb4069d 204 /* free group */
screamer 0:7a64fbb4069d 205 memp_free(MEMP_IGMP_GROUP, group);
screamer 0:7a64fbb4069d 206 } else {
screamer 0:7a64fbb4069d 207 /* change the "previous" */
screamer 0:7a64fbb4069d 208 prev = group;
screamer 0:7a64fbb4069d 209 }
screamer 0:7a64fbb4069d 210 /* move to "next" */
screamer 0:7a64fbb4069d 211 group = next;
screamer 0:7a64fbb4069d 212 }
screamer 0:7a64fbb4069d 213 return ERR_OK;
screamer 0:7a64fbb4069d 214 }
screamer 0:7a64fbb4069d 215
screamer 0:7a64fbb4069d 216 /**
screamer 0:7a64fbb4069d 217 * Report IGMP memberships for this interface
screamer 0:7a64fbb4069d 218 *
screamer 0:7a64fbb4069d 219 * @param netif network interface on which report IGMP memberships
screamer 0:7a64fbb4069d 220 */
screamer 0:7a64fbb4069d 221 void
screamer 0:7a64fbb4069d 222 igmp_report_groups( struct netif *netif)
screamer 0:7a64fbb4069d 223 {
screamer 0:7a64fbb4069d 224 struct igmp_group *group = igmp_group_list;
screamer 0:7a64fbb4069d 225
screamer 0:7a64fbb4069d 226 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
screamer 0:7a64fbb4069d 227
screamer 0:7a64fbb4069d 228 while (group != NULL) {
screamer 0:7a64fbb4069d 229 if (group->interface == netif) {
screamer 0:7a64fbb4069d 230 igmp_delaying_member( group, IGMP_JOIN_DELAYING_MEMBER_TMR);
screamer 0:7a64fbb4069d 231 }
screamer 0:7a64fbb4069d 232 group = group->next;
screamer 0:7a64fbb4069d 233 }
screamer 0:7a64fbb4069d 234 }
screamer 0:7a64fbb4069d 235
screamer 0:7a64fbb4069d 236 /**
screamer 0:7a64fbb4069d 237 * Search for a group in the global igmp_group_list
screamer 0:7a64fbb4069d 238 *
screamer 0:7a64fbb4069d 239 * @param ifp the network interface for which to look
screamer 0:7a64fbb4069d 240 * @param addr the group ip address to search for
screamer 0:7a64fbb4069d 241 * @return a struct igmp_group* if the group has been found,
screamer 0:7a64fbb4069d 242 * NULL if the group wasn't found.
screamer 0:7a64fbb4069d 243 */
screamer 0:7a64fbb4069d 244 struct igmp_group *
screamer 0:7a64fbb4069d 245 igmp_lookfor_group(struct netif *ifp, struct ip_addr *addr)
screamer 0:7a64fbb4069d 246 {
screamer 0:7a64fbb4069d 247 struct igmp_group *group = igmp_group_list;
screamer 0:7a64fbb4069d 248
screamer 0:7a64fbb4069d 249 while (group != NULL) {
screamer 0:7a64fbb4069d 250 if ((group->interface == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
screamer 0:7a64fbb4069d 251 return group;
screamer 0:7a64fbb4069d 252 }
screamer 0:7a64fbb4069d 253 group = group->next;
screamer 0:7a64fbb4069d 254 }
screamer 0:7a64fbb4069d 255
screamer 0:7a64fbb4069d 256 /* to be clearer, we return NULL here instead of
screamer 0:7a64fbb4069d 257 * 'group' (which is also NULL at this point).
screamer 0:7a64fbb4069d 258 */
screamer 0:7a64fbb4069d 259 return NULL;
screamer 0:7a64fbb4069d 260 }
screamer 0:7a64fbb4069d 261
screamer 0:7a64fbb4069d 262 /**
screamer 0:7a64fbb4069d 263 * Search for a specific igmp group and create a new one if not found-
screamer 0:7a64fbb4069d 264 *
screamer 0:7a64fbb4069d 265 * @param ifp the network interface for which to look
screamer 0:7a64fbb4069d 266 * @param addr the group ip address to search
screamer 0:7a64fbb4069d 267 * @return a struct igmp_group*,
screamer 0:7a64fbb4069d 268 * NULL on memory error.
screamer 0:7a64fbb4069d 269 */
screamer 0:7a64fbb4069d 270 struct igmp_group *
screamer 0:7a64fbb4069d 271 igmp_lookup_group(struct netif *ifp, struct ip_addr *addr)
screamer 0:7a64fbb4069d 272 {
screamer 0:7a64fbb4069d 273 struct igmp_group *group = igmp_group_list;
screamer 0:7a64fbb4069d 274
screamer 0:7a64fbb4069d 275 /* Search if the group already exists */
screamer 0:7a64fbb4069d 276 group = igmp_lookfor_group(ifp, addr);
screamer 0:7a64fbb4069d 277 if (group != NULL) {
screamer 0:7a64fbb4069d 278 /* Group already exists. */
screamer 0:7a64fbb4069d 279 return group;
screamer 0:7a64fbb4069d 280 }
screamer 0:7a64fbb4069d 281
screamer 0:7a64fbb4069d 282 /* Group doesn't exist yet, create a new one */
screamer 0:7a64fbb4069d 283 group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP); // static_cast<struct igmp_group *>(x)
screamer 0:7a64fbb4069d 284 if (group != NULL) {
screamer 0:7a64fbb4069d 285 group->interface = ifp;
screamer 0:7a64fbb4069d 286 ip_addr_set(&(group->group_address), addr);
screamer 0:7a64fbb4069d 287 group->timer = 0; /* Not running */
screamer 0:7a64fbb4069d 288 group->group_state = IGMP_GROUP_NON_MEMBER;
screamer 0:7a64fbb4069d 289 group->last_reporter_flag = 0;
screamer 0:7a64fbb4069d 290 group->use = 0;
screamer 0:7a64fbb4069d 291 group->next = igmp_group_list;
screamer 0:7a64fbb4069d 292
screamer 0:7a64fbb4069d 293 igmp_group_list = group;
screamer 0:7a64fbb4069d 294 }
screamer 0:7a64fbb4069d 295
screamer 0:7a64fbb4069d 296 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
screamer 0:7a64fbb4069d 297 ip_addr_debug_print(IGMP_DEBUG, addr);
screamer 0:7a64fbb4069d 298 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
screamer 0:7a64fbb4069d 299
screamer 0:7a64fbb4069d 300 return group;
screamer 0:7a64fbb4069d 301 }
screamer 0:7a64fbb4069d 302
screamer 0:7a64fbb4069d 303 /**
screamer 0:7a64fbb4069d 304 * Remove a group in the global igmp_group_list
screamer 0:7a64fbb4069d 305 *
screamer 0:7a64fbb4069d 306 * @param group the group to remove from the global igmp_group_list
screamer 0:7a64fbb4069d 307 * @return ERR_OK if group was removed from the list, an err_t otherwise
screamer 0:7a64fbb4069d 308 */
screamer 0:7a64fbb4069d 309 err_t
screamer 0:7a64fbb4069d 310 igmp_remove_group(struct igmp_group *group)
screamer 0:7a64fbb4069d 311 {
screamer 0:7a64fbb4069d 312 err_t err = ERR_OK;
screamer 0:7a64fbb4069d 313
screamer 0:7a64fbb4069d 314 /* Is it the first group? */
screamer 0:7a64fbb4069d 315 if (igmp_group_list == group) {
screamer 0:7a64fbb4069d 316 igmp_group_list = group->next;
screamer 0:7a64fbb4069d 317 } else {
screamer 0:7a64fbb4069d 318 /* look for group further down the list */
screamer 0:7a64fbb4069d 319 struct igmp_group *tmpGroup;
screamer 0:7a64fbb4069d 320 for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
screamer 0:7a64fbb4069d 321 if (tmpGroup->next == group) {
screamer 0:7a64fbb4069d 322 tmpGroup->next = group->next;
screamer 0:7a64fbb4069d 323 break;
screamer 0:7a64fbb4069d 324 }
screamer 0:7a64fbb4069d 325 }
screamer 0:7a64fbb4069d 326 /* Group not found in the global igmp_group_list */
screamer 0:7a64fbb4069d 327 if (tmpGroup == NULL)
screamer 0:7a64fbb4069d 328 err = ERR_ARG;
screamer 0:7a64fbb4069d 329 }
screamer 0:7a64fbb4069d 330 /* free group */
screamer 0:7a64fbb4069d 331 memp_free(MEMP_IGMP_GROUP, group);
screamer 0:7a64fbb4069d 332
screamer 0:7a64fbb4069d 333 return err;
screamer 0:7a64fbb4069d 334 }
screamer 0:7a64fbb4069d 335
screamer 0:7a64fbb4069d 336 /**
screamer 0:7a64fbb4069d 337 * Called from ip_input() if a new IGMP packet is received.
screamer 0:7a64fbb4069d 338 *
screamer 0:7a64fbb4069d 339 * @param p received igmp packet, p->payload pointing to the ip header
screamer 0:7a64fbb4069d 340 * @param inp network interface on which the packet was received
screamer 0:7a64fbb4069d 341 * @param dest destination ip address of the igmp packet
screamer 0:7a64fbb4069d 342 */
screamer 0:7a64fbb4069d 343 void
screamer 0:7a64fbb4069d 344 igmp_input(struct pbuf *p, struct netif *inp, struct ip_addr *dest)
screamer 0:7a64fbb4069d 345 {
screamer 0:7a64fbb4069d 346 struct ip_hdr * iphdr;
screamer 0:7a64fbb4069d 347 struct igmp_msg* igmp;
screamer 0:7a64fbb4069d 348 struct igmp_group* group;
screamer 0:7a64fbb4069d 349 struct igmp_group* groupref;
screamer 0:7a64fbb4069d 350
screamer 0:7a64fbb4069d 351 /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
screamer 0:7a64fbb4069d 352 iphdr = (struct ip_hdr *)p->payload; // static_cast<struct ip_hdr *>(x)
screamer 0:7a64fbb4069d 353 if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
screamer 0:7a64fbb4069d 354 pbuf_free(p);
screamer 0:7a64fbb4069d 355 IGMP_STATS_INC(igmp.lenerr);
screamer 0:7a64fbb4069d 356 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
screamer 0:7a64fbb4069d 357 return;
screamer 0:7a64fbb4069d 358 }
screamer 0:7a64fbb4069d 359
screamer 0:7a64fbb4069d 360 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
screamer 0:7a64fbb4069d 361 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
screamer 0:7a64fbb4069d 362 LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
screamer 0:7a64fbb4069d 363 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
screamer 0:7a64fbb4069d 364 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
screamer 0:7a64fbb4069d 365
screamer 0:7a64fbb4069d 366 /* Now calculate and check the checksum */
screamer 0:7a64fbb4069d 367 igmp = (struct igmp_msg *)p->payload;
screamer 0:7a64fbb4069d 368 if (inet_chksum(igmp, p->len)) {
screamer 0:7a64fbb4069d 369 pbuf_free(p);
screamer 0:7a64fbb4069d 370 IGMP_STATS_INC(igmp.chkerr);
screamer 0:7a64fbb4069d 371 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
screamer 0:7a64fbb4069d 372 return;
screamer 0:7a64fbb4069d 373 }
screamer 0:7a64fbb4069d 374
screamer 0:7a64fbb4069d 375 /* Packet is ok so find an existing group */
screamer 0:7a64fbb4069d 376 group = igmp_lookfor_group(inp, dest); /* use the incoming IP address! */
screamer 0:7a64fbb4069d 377
screamer 0:7a64fbb4069d 378 /* If group can be found or create... */
screamer 0:7a64fbb4069d 379 if (!group) {
screamer 0:7a64fbb4069d 380 pbuf_free(p);
screamer 0:7a64fbb4069d 381 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
screamer 0:7a64fbb4069d 382 return;
screamer 0:7a64fbb4069d 383 }
screamer 0:7a64fbb4069d 384
screamer 0:7a64fbb4069d 385 /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
screamer 0:7a64fbb4069d 386 switch (igmp->igmp_msgtype) {
screamer 0:7a64fbb4069d 387 case IGMP_MEMB_QUERY: {
screamer 0:7a64fbb4069d 388 /* IGMP_MEMB_QUERY to the "all systems" address ? */
screamer 0:7a64fbb4069d 389 if ((ip_addr_cmp(dest, &allsystems)) && (igmp->igmp_group_address.addr == 0)) {
screamer 0:7a64fbb4069d 390 /* THIS IS THE GENERAL QUERY */
screamer 0:7a64fbb4069d 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)));
screamer 0:7a64fbb4069d 392
screamer 0:7a64fbb4069d 393 if (igmp->igmp_maxresp == 0) {
screamer 0:7a64fbb4069d 394 IGMP_STATS_INC(igmp.v1_rxed);
screamer 0:7a64fbb4069d 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"));
screamer 0:7a64fbb4069d 396 igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
screamer 0:7a64fbb4069d 397 }
screamer 0:7a64fbb4069d 398
screamer 0:7a64fbb4069d 399 IGMP_STATS_INC(igmp.group_query_rxed);
screamer 0:7a64fbb4069d 400 groupref = igmp_group_list;
screamer 0:7a64fbb4069d 401 while (groupref) {
screamer 0:7a64fbb4069d 402 /* Do not send messages on the all systems group address! */
screamer 0:7a64fbb4069d 403 if ((groupref->interface == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
screamer 0:7a64fbb4069d 404 igmp_delaying_member( groupref, igmp->igmp_maxresp);
screamer 0:7a64fbb4069d 405 }
screamer 0:7a64fbb4069d 406 groupref = groupref->next;
screamer 0:7a64fbb4069d 407 }
screamer 0:7a64fbb4069d 408 } else {
screamer 0:7a64fbb4069d 409 /* IGMP_MEMB_QUERY to a specific group ? */
screamer 0:7a64fbb4069d 410 if (group->group_address.addr != 0) {
screamer 0:7a64fbb4069d 411 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
screamer 0:7a64fbb4069d 412 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
screamer 0:7a64fbb4069d 413 if (ip_addr_cmp (dest, &allsystems)) {
screamer 0:7a64fbb4069d 414 LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
screamer 0:7a64fbb4069d 415 /* we first need to re-lookfor the group since we used dest last time */
screamer 0:7a64fbb4069d 416 group = igmp_lookfor_group(inp, &igmp->igmp_group_address);
screamer 0:7a64fbb4069d 417 } else {
screamer 0:7a64fbb4069d 418 LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
screamer 0:7a64fbb4069d 419 }
screamer 0:7a64fbb4069d 420
screamer 0:7a64fbb4069d 421 if (group != NULL) {
screamer 0:7a64fbb4069d 422 IGMP_STATS_INC(igmp.unicast_query);
screamer 0:7a64fbb4069d 423 igmp_delaying_member( group, igmp->igmp_maxresp);
screamer 0:7a64fbb4069d 424 }
screamer 0:7a64fbb4069d 425 }
screamer 0:7a64fbb4069d 426 }
screamer 0:7a64fbb4069d 427 break;
screamer 0:7a64fbb4069d 428 }
screamer 0:7a64fbb4069d 429 case IGMP_V2_MEMB_REPORT: {
screamer 0:7a64fbb4069d 430 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
screamer 0:7a64fbb4069d 431
screamer 0:7a64fbb4069d 432 IGMP_STATS_INC(igmp.report_rxed);
screamer 0:7a64fbb4069d 433 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
screamer 0:7a64fbb4069d 434 /* This is on a specific group we have already looked up */
screamer 0:7a64fbb4069d 435 group->timer = 0; /* stopped */
screamer 0:7a64fbb4069d 436 group->group_state = IGMP_GROUP_IDLE_MEMBER;
screamer 0:7a64fbb4069d 437 group->last_reporter_flag = 0;
screamer 0:7a64fbb4069d 438 }
screamer 0:7a64fbb4069d 439 break;
screamer 0:7a64fbb4069d 440 }
screamer 0:7a64fbb4069d 441 default: {
screamer 0:7a64fbb4069d 442 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
screamer 0:7a64fbb4069d 443 igmp->igmp_msgtype, group->group_state, &group, group->interface));
screamer 0:7a64fbb4069d 444 break;
screamer 0:7a64fbb4069d 445 }
screamer 0:7a64fbb4069d 446 }
screamer 0:7a64fbb4069d 447
screamer 0:7a64fbb4069d 448 pbuf_free(p);
screamer 0:7a64fbb4069d 449 return;
screamer 0:7a64fbb4069d 450 }
screamer 0:7a64fbb4069d 451
screamer 0:7a64fbb4069d 452 /**
screamer 0:7a64fbb4069d 453 * Join a group on one network interface.
screamer 0:7a64fbb4069d 454 *
screamer 0:7a64fbb4069d 455 * @param ifaddr ip address of the network interface which should join a new group
screamer 0:7a64fbb4069d 456 * @param groupaddr the ip address of the group which to join
screamer 0:7a64fbb4069d 457 * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
screamer 0:7a64fbb4069d 458 */
screamer 0:7a64fbb4069d 459 err_t
screamer 0:7a64fbb4069d 460 igmp_joingroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr)
screamer 0:7a64fbb4069d 461 {
screamer 0:7a64fbb4069d 462 err_t err = ERR_VAL; /* no matching interface */
screamer 0:7a64fbb4069d 463 struct igmp_group *group;
screamer 0:7a64fbb4069d 464 struct netif *netif;
screamer 0:7a64fbb4069d 465
screamer 0:7a64fbb4069d 466 /* make sure it is multicast address */
screamer 0:7a64fbb4069d 467 LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
screamer 0:7a64fbb4069d 468 LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
screamer 0:7a64fbb4069d 469
screamer 0:7a64fbb4069d 470 /* loop through netif's */
screamer 0:7a64fbb4069d 471 netif = netif_list;
screamer 0:7a64fbb4069d 472 while (netif != NULL) {
screamer 0:7a64fbb4069d 473 /* Should we join this interface ? */
screamer 0:7a64fbb4069d 474 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
screamer 0:7a64fbb4069d 475 /* find group or create a new one if not found */
screamer 0:7a64fbb4069d 476 group = igmp_lookup_group(netif, groupaddr);
screamer 0:7a64fbb4069d 477
screamer 0:7a64fbb4069d 478 if (group != NULL) {
screamer 0:7a64fbb4069d 479 /* This should create a new group, check the state to make sure */
screamer 0:7a64fbb4069d 480 if (group->group_state != IGMP_GROUP_NON_MEMBER) {
screamer 0:7a64fbb4069d 481 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
screamer 0:7a64fbb4069d 482 } else {
screamer 0:7a64fbb4069d 483 /* OK - it was new group */
screamer 0:7a64fbb4069d 484 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
screamer 0:7a64fbb4069d 485 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
screamer 0:7a64fbb4069d 486 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
screamer 0:7a64fbb4069d 487
screamer 0:7a64fbb4069d 488 /* If first use of the group, allow the group at the MAC level */
screamer 0:7a64fbb4069d 489 if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
screamer 0:7a64fbb4069d 490 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
screamer 0:7a64fbb4069d 491 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
screamer 0:7a64fbb4069d 492 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
screamer 0:7a64fbb4069d 493 netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
screamer 0:7a64fbb4069d 494 }
screamer 0:7a64fbb4069d 495
screamer 0:7a64fbb4069d 496 IGMP_STATS_INC(igmp.join_sent);
screamer 0:7a64fbb4069d 497 igmp_send(group, IGMP_V2_MEMB_REPORT);
screamer 0:7a64fbb4069d 498
screamer 0:7a64fbb4069d 499 igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
screamer 0:7a64fbb4069d 500
screamer 0:7a64fbb4069d 501 /* Need to work out where this timer comes from */
screamer 0:7a64fbb4069d 502 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
screamer 0:7a64fbb4069d 503 }
screamer 0:7a64fbb4069d 504 /* Increment group use */
screamer 0:7a64fbb4069d 505 group->use++;
screamer 0:7a64fbb4069d 506 /* Join on this interface */
screamer 0:7a64fbb4069d 507 err = ERR_OK;
screamer 0:7a64fbb4069d 508 } else {
screamer 0:7a64fbb4069d 509 /* Return an error even if some network interfaces are joined */
screamer 0:7a64fbb4069d 510 /** @todo undo any other netif already joined */
screamer 0:7a64fbb4069d 511 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
screamer 0:7a64fbb4069d 512 return ERR_MEM;
screamer 0:7a64fbb4069d 513 }
screamer 0:7a64fbb4069d 514 }
screamer 0:7a64fbb4069d 515 /* proceed to next network interface */
screamer 0:7a64fbb4069d 516 netif = netif->next;
screamer 0:7a64fbb4069d 517 }
screamer 0:7a64fbb4069d 518
screamer 0:7a64fbb4069d 519 return err;
screamer 0:7a64fbb4069d 520 }
screamer 0:7a64fbb4069d 521
screamer 0:7a64fbb4069d 522 /**
screamer 0:7a64fbb4069d 523 * Leave a group on one network interface.
screamer 0:7a64fbb4069d 524 *
screamer 0:7a64fbb4069d 525 * @param ifaddr ip address of the network interface which should leave a group
screamer 0:7a64fbb4069d 526 * @param groupaddr the ip address of the group which to leave
screamer 0:7a64fbb4069d 527 * @return ERR_OK if group was left on the netif(s), an err_t otherwise
screamer 0:7a64fbb4069d 528 */
screamer 0:7a64fbb4069d 529 err_t
screamer 0:7a64fbb4069d 530 igmp_leavegroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr)
screamer 0:7a64fbb4069d 531 {
screamer 0:7a64fbb4069d 532 err_t err = ERR_VAL; /* no matching interface */
screamer 0:7a64fbb4069d 533 struct igmp_group *group;
screamer 0:7a64fbb4069d 534 struct netif *netif;
screamer 0:7a64fbb4069d 535
screamer 0:7a64fbb4069d 536 /* make sure it is multicast address */
screamer 0:7a64fbb4069d 537 LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
screamer 0:7a64fbb4069d 538 LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
screamer 0:7a64fbb4069d 539
screamer 0:7a64fbb4069d 540 /* loop through netif's */
screamer 0:7a64fbb4069d 541 netif = netif_list;
screamer 0:7a64fbb4069d 542 while (netif != NULL) {
screamer 0:7a64fbb4069d 543 /* Should we leave this interface ? */
screamer 0:7a64fbb4069d 544 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
screamer 0:7a64fbb4069d 545 /* find group */
screamer 0:7a64fbb4069d 546 group = igmp_lookfor_group(netif, groupaddr);
screamer 0:7a64fbb4069d 547
screamer 0:7a64fbb4069d 548 if (group != NULL) {
screamer 0:7a64fbb4069d 549 /* Only send a leave if the flag is set according to the state diagram */
screamer 0:7a64fbb4069d 550 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
screamer 0:7a64fbb4069d 551 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
screamer 0:7a64fbb4069d 552 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
screamer 0:7a64fbb4069d 553
screamer 0:7a64fbb4069d 554 /* If there is no other use of the group */
screamer 0:7a64fbb4069d 555 if (group->use <= 1) {
screamer 0:7a64fbb4069d 556 /* If we are the last reporter for this group */
screamer 0:7a64fbb4069d 557 if (group->last_reporter_flag) {
screamer 0:7a64fbb4069d 558 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
screamer 0:7a64fbb4069d 559 IGMP_STATS_INC(igmp.leave_sent);
screamer 0:7a64fbb4069d 560 igmp_send(group, IGMP_LEAVE_GROUP);
screamer 0:7a64fbb4069d 561 }
screamer 0:7a64fbb4069d 562
screamer 0:7a64fbb4069d 563 /* Disable the group at the MAC level */
screamer 0:7a64fbb4069d 564 if (netif->igmp_mac_filter != NULL) {
screamer 0:7a64fbb4069d 565 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
screamer 0:7a64fbb4069d 566 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
screamer 0:7a64fbb4069d 567 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
screamer 0:7a64fbb4069d 568 netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
screamer 0:7a64fbb4069d 569 }
screamer 0:7a64fbb4069d 570
screamer 0:7a64fbb4069d 571 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
screamer 0:7a64fbb4069d 572 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
screamer 0:7a64fbb4069d 573 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
screamer 0:7a64fbb4069d 574
screamer 0:7a64fbb4069d 575 /* Free the group */
screamer 0:7a64fbb4069d 576 igmp_remove_group(group);
screamer 0:7a64fbb4069d 577 } else {
screamer 0:7a64fbb4069d 578 /* Decrement group use */
screamer 0:7a64fbb4069d 579 group->use--;
screamer 0:7a64fbb4069d 580 }
screamer 0:7a64fbb4069d 581 /* Leave on this interface */
screamer 0:7a64fbb4069d 582 err = ERR_OK;
screamer 0:7a64fbb4069d 583 } else {
screamer 0:7a64fbb4069d 584 /* It's not a fatal error on "leavegroup" */
screamer 0:7a64fbb4069d 585 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
screamer 0:7a64fbb4069d 586 }
screamer 0:7a64fbb4069d 587 }
screamer 0:7a64fbb4069d 588 /* proceed to next network interface */
screamer 0:7a64fbb4069d 589 netif = netif->next;
screamer 0:7a64fbb4069d 590 }
screamer 0:7a64fbb4069d 591
screamer 0:7a64fbb4069d 592 return err;
screamer 0:7a64fbb4069d 593 }
screamer 0:7a64fbb4069d 594
screamer 0:7a64fbb4069d 595 /**
screamer 0:7a64fbb4069d 596 * The igmp timer function (both for NO_SYS=1 and =0)
screamer 0:7a64fbb4069d 597 * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
screamer 0:7a64fbb4069d 598 */
screamer 0:7a64fbb4069d 599 void
screamer 0:7a64fbb4069d 600 igmp_tmr(void)
screamer 0:7a64fbb4069d 601 {
screamer 0:7a64fbb4069d 602 struct igmp_group *group = igmp_group_list;
screamer 0:7a64fbb4069d 603
screamer 0:7a64fbb4069d 604 while (group != NULL) {
screamer 0:7a64fbb4069d 605 if (group->timer != 0) {
screamer 0:7a64fbb4069d 606 group->timer -= 1;
screamer 0:7a64fbb4069d 607 if (group->timer == 0) {
screamer 0:7a64fbb4069d 608 igmp_timeout(group);
screamer 0:7a64fbb4069d 609 }
screamer 0:7a64fbb4069d 610 }
screamer 0:7a64fbb4069d 611 group = group->next;
screamer 0:7a64fbb4069d 612 }
screamer 0:7a64fbb4069d 613 }
screamer 0:7a64fbb4069d 614
screamer 0:7a64fbb4069d 615 /**
screamer 0:7a64fbb4069d 616 * Called if a timeout for one group is reached.
screamer 0:7a64fbb4069d 617 * Sends a report for this group.
screamer 0:7a64fbb4069d 618 *
screamer 0:7a64fbb4069d 619 * @param group an igmp_group for which a timeout is reached
screamer 0:7a64fbb4069d 620 */
screamer 0:7a64fbb4069d 621 void
screamer 0:7a64fbb4069d 622 igmp_timeout(struct igmp_group *group)
screamer 0:7a64fbb4069d 623 {
screamer 0:7a64fbb4069d 624 /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
screamer 0:7a64fbb4069d 625 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
screamer 0:7a64fbb4069d 626 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
screamer 0:7a64fbb4069d 627 ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
screamer 0:7a64fbb4069d 628 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->interface));
screamer 0:7a64fbb4069d 629
screamer 0:7a64fbb4069d 630 igmp_send(group, IGMP_V2_MEMB_REPORT);
screamer 0:7a64fbb4069d 631 }
screamer 0:7a64fbb4069d 632 }
screamer 0:7a64fbb4069d 633
screamer 0:7a64fbb4069d 634 /**
screamer 0:7a64fbb4069d 635 * Start a timer for an igmp group
screamer 0:7a64fbb4069d 636 *
screamer 0:7a64fbb4069d 637 * @param group the igmp_group for which to start a timer
screamer 0:7a64fbb4069d 638 * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
screamer 0:7a64fbb4069d 639 * every call to igmp_tmr())
screamer 0:7a64fbb4069d 640 */
screamer 0:7a64fbb4069d 641 void
screamer 0:7a64fbb4069d 642 igmp_start_timer(struct igmp_group *group, u8_t max_time)
screamer 0:7a64fbb4069d 643 {
screamer 0:7a64fbb4069d 644 /**
screamer 0:7a64fbb4069d 645 * @todo Important !! this should be random 0 -> max_time. Find out how to do this
screamer 0:7a64fbb4069d 646 */
screamer 0:7a64fbb4069d 647 group->timer = max_time;
screamer 0:7a64fbb4069d 648 }
screamer 0:7a64fbb4069d 649
screamer 0:7a64fbb4069d 650 /**
screamer 0:7a64fbb4069d 651 * Stop a timer for an igmp_group
screamer 0:7a64fbb4069d 652 *
screamer 0:7a64fbb4069d 653 * @param group the igmp_group for which to stop the timer
screamer 0:7a64fbb4069d 654 */
screamer 0:7a64fbb4069d 655 void
screamer 0:7a64fbb4069d 656 igmp_stop_timer(struct igmp_group *group)
screamer 0:7a64fbb4069d 657 {
screamer 0:7a64fbb4069d 658 group->timer = 0;
screamer 0:7a64fbb4069d 659 }
screamer 0:7a64fbb4069d 660
screamer 0:7a64fbb4069d 661 /**
screamer 0:7a64fbb4069d 662 * Delaying membership report for a group if necessary
screamer 0:7a64fbb4069d 663 *
screamer 0:7a64fbb4069d 664 * @param group the igmp_group for which "delaying" membership report
screamer 0:7a64fbb4069d 665 * @param maxresp query delay
screamer 0:7a64fbb4069d 666 */
screamer 0:7a64fbb4069d 667 void
screamer 0:7a64fbb4069d 668 igmp_delaying_member( struct igmp_group *group, u8_t maxresp)
screamer 0:7a64fbb4069d 669 {
screamer 0:7a64fbb4069d 670 if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) || ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) && (maxresp > group->timer))) {
screamer 0:7a64fbb4069d 671 igmp_start_timer(group, (maxresp)/2);
screamer 0:7a64fbb4069d 672 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
screamer 0:7a64fbb4069d 673 }
screamer 0:7a64fbb4069d 674 }
screamer 0:7a64fbb4069d 675
screamer 0:7a64fbb4069d 676
screamer 0:7a64fbb4069d 677 /**
screamer 0:7a64fbb4069d 678 * Sends an IP packet on a network interface. This function constructs the IP header
screamer 0:7a64fbb4069d 679 * and calculates the IP header checksum. If the source IP address is NULL,
screamer 0:7a64fbb4069d 680 * the IP address of the outgoing network interface is filled in as source address.
screamer 0:7a64fbb4069d 681 *
screamer 0:7a64fbb4069d 682 * @param p the packet to send (p->payload points to the data, e.g. next
screamer 0:7a64fbb4069d 683 protocol header; if dest == IP_HDRINCL, p already includes an IP
screamer 0:7a64fbb4069d 684 header and p->payload points to that IP header)
screamer 0:7a64fbb4069d 685 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
screamer 0:7a64fbb4069d 686 * IP address of the netif used to send is used as source address)
screamer 0:7a64fbb4069d 687 * @param dest the destination IP address to send the packet to
screamer 0:7a64fbb4069d 688 * @param ttl the TTL value to be set in the IP header
screamer 0:7a64fbb4069d 689 * @param proto the PROTOCOL to be set in the IP header
screamer 0:7a64fbb4069d 690 * @param netif the netif on which to send this packet
screamer 0:7a64fbb4069d 691 * @return ERR_OK if the packet was sent OK
screamer 0:7a64fbb4069d 692 * ERR_BUF if p doesn't have enough space for IP/LINK headers
screamer 0:7a64fbb4069d 693 * returns errors returned by netif->output
screamer 0:7a64fbb4069d 694 */
screamer 0:7a64fbb4069d 695 err_t
screamer 0:7a64fbb4069d 696 igmp_ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
screamer 0:7a64fbb4069d 697 u8_t ttl, u8_t proto, struct netif *netif)
screamer 0:7a64fbb4069d 698 {
screamer 0:7a64fbb4069d 699 static u16_t ip_id = 0;
screamer 0:7a64fbb4069d 700 struct ip_hdr * iphdr = NULL;
screamer 0:7a64fbb4069d 701 u16_t * ra = NULL;
screamer 0:7a64fbb4069d 702
screamer 0:7a64fbb4069d 703 /* First write in the "router alert" */
screamer 0:7a64fbb4069d 704 if (pbuf_header(p, ROUTER_ALERTLEN)) {
screamer 0:7a64fbb4069d 705 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: not enough room for IP header in pbuf\n"));
screamer 0:7a64fbb4069d 706 return ERR_BUF;
screamer 0:7a64fbb4069d 707 }
screamer 0:7a64fbb4069d 708
screamer 0:7a64fbb4069d 709 /* This is the "router alert" option */
screamer 0:7a64fbb4069d 710 ra = (u16_t *)p->payload; // static_cast<u16_t>(x)
screamer 0:7a64fbb4069d 711 ra[0] = htons (ROUTER_ALERT);
screamer 0:7a64fbb4069d 712 ra[1] = 0x0000; /* Router shall examine packet */
screamer 0:7a64fbb4069d 713
screamer 0:7a64fbb4069d 714 /* now the normal ip header */
screamer 0:7a64fbb4069d 715 if (pbuf_header(p, IP_HLEN)) {
screamer 0:7a64fbb4069d 716 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: not enough room for IP header in pbuf\n"));
screamer 0:7a64fbb4069d 717 return ERR_BUF;
screamer 0:7a64fbb4069d 718 }
screamer 0:7a64fbb4069d 719
screamer 0:7a64fbb4069d 720 iphdr = (struct ip_hdr *)p->payload; //static_cast<struct ip_hdr *>(x)
screamer 0:7a64fbb4069d 721
screamer 0:7a64fbb4069d 722 /* Should the IP header be generated or is it already included in p? */
screamer 0:7a64fbb4069d 723 if (dest != IP_HDRINCL) {
screamer 0:7a64fbb4069d 724 /** @todo should be shared with ip.c - ip_output_if */
screamer 0:7a64fbb4069d 725 IPH_TTL_SET(iphdr, ttl);
screamer 0:7a64fbb4069d 726 IPH_PROTO_SET(iphdr, proto);
screamer 0:7a64fbb4069d 727
screamer 0:7a64fbb4069d 728 ip_addr_set(&(iphdr->dest), dest);
screamer 0:7a64fbb4069d 729
screamer 0:7a64fbb4069d 730 IPH_VHLTOS_SET(iphdr, 4, ((IP_HLEN + ROUTER_ALERTLEN) / 4), 0/*tos*/);
screamer 0:7a64fbb4069d 731 IPH_LEN_SET(iphdr, htons(p->tot_len));
screamer 0:7a64fbb4069d 732 IPH_OFFSET_SET(iphdr, 0);
screamer 0:7a64fbb4069d 733 IPH_ID_SET(iphdr, htons(ip_id));
screamer 0:7a64fbb4069d 734 ++ip_id;
screamer 0:7a64fbb4069d 735
screamer 0:7a64fbb4069d 736 if (ip_addr_isany(src)) {
screamer 0:7a64fbb4069d 737 ip_addr_set(&(iphdr->src), &(netif->ip_addr));
screamer 0:7a64fbb4069d 738 } else {
screamer 0:7a64fbb4069d 739 ip_addr_set(&(iphdr->src), src);
screamer 0:7a64fbb4069d 740 }
screamer 0:7a64fbb4069d 741
screamer 0:7a64fbb4069d 742 IPH_CHKSUM_SET(iphdr, 0);
screamer 0:7a64fbb4069d 743 #if CHECKSUM_GEN_IP
screamer 0:7a64fbb4069d 744 IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, (IP_HLEN + ROUTER_ALERTLEN)));
screamer 0:7a64fbb4069d 745 #endif
screamer 0:7a64fbb4069d 746 } else {
screamer 0:7a64fbb4069d 747 dest = &(iphdr->dest);
screamer 0:7a64fbb4069d 748 }
screamer 0:7a64fbb4069d 749
screamer 0:7a64fbb4069d 750 #if IP_DEBUG
screamer 0:7a64fbb4069d 751 ip_debug_print(p);
screamer 0:7a64fbb4069d 752 #endif
screamer 0:7a64fbb4069d 753
screamer 0:7a64fbb4069d 754 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: sending to if %p\n", netif));
screamer 0:7a64fbb4069d 755
screamer 0:7a64fbb4069d 756 return netif->output(netif, p, dest);
screamer 0:7a64fbb4069d 757 }
screamer 0:7a64fbb4069d 758
screamer 0:7a64fbb4069d 759 /**
screamer 0:7a64fbb4069d 760 * Send an igmp packet to a specific group.
screamer 0:7a64fbb4069d 761 *
screamer 0:7a64fbb4069d 762 * @param group the group to which to send the packet
screamer 0:7a64fbb4069d 763 * @param type the type of igmp packet to send
screamer 0:7a64fbb4069d 764 */
screamer 0:7a64fbb4069d 765 void
screamer 0:7a64fbb4069d 766 igmp_send(struct igmp_group *group, u8_t type)
screamer 0:7a64fbb4069d 767 {
screamer 0:7a64fbb4069d 768 struct pbuf* p = NULL;
screamer 0:7a64fbb4069d 769 struct igmp_msg* igmp = NULL;
screamer 0:7a64fbb4069d 770 struct ip_addr src = {0};
screamer 0:7a64fbb4069d 771 struct ip_addr* dest = NULL;
screamer 0:7a64fbb4069d 772
screamer 0:7a64fbb4069d 773 /* IP header + "router alert" option + IGMP header */
screamer 0:7a64fbb4069d 774 p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
screamer 0:7a64fbb4069d 775
screamer 0:7a64fbb4069d 776 if (p) {
screamer 0:7a64fbb4069d 777 igmp = (struct igmp_msg *)p->payload; // static_cast<igmp_mgs *>(x)
screamer 0:7a64fbb4069d 778 LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
screamer 0:7a64fbb4069d 779 (p->len >= sizeof(struct igmp_msg)));
screamer 0:7a64fbb4069d 780 ip_addr_set(&src, &((group->interface)->ip_addr));
screamer 0:7a64fbb4069d 781
screamer 0:7a64fbb4069d 782 if (type == IGMP_V2_MEMB_REPORT) {
screamer 0:7a64fbb4069d 783 dest = &(group->group_address);
screamer 0:7a64fbb4069d 784 IGMP_STATS_INC(igmp.report_sent);
screamer 0:7a64fbb4069d 785 ip_addr_set(&(igmp->igmp_group_address), &(group->group_address));
screamer 0:7a64fbb4069d 786 group->last_reporter_flag = 1; /* Remember we were the last to report */
screamer 0:7a64fbb4069d 787 } else {
screamer 0:7a64fbb4069d 788 if (type == IGMP_LEAVE_GROUP) {
screamer 0:7a64fbb4069d 789 dest = &allrouters;
screamer 0:7a64fbb4069d 790 ip_addr_set(&(igmp->igmp_group_address), &(group->group_address));
screamer 0:7a64fbb4069d 791 }
screamer 0:7a64fbb4069d 792 }
screamer 0:7a64fbb4069d 793
screamer 0:7a64fbb4069d 794 if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
screamer 0:7a64fbb4069d 795 igmp->igmp_msgtype = type;
screamer 0:7a64fbb4069d 796 igmp->igmp_maxresp = 0;
screamer 0:7a64fbb4069d 797 igmp->igmp_checksum = 0;
screamer 0:7a64fbb4069d 798 igmp->igmp_checksum = inet_chksum( igmp, IGMP_MINLEN);
screamer 0:7a64fbb4069d 799
screamer 0:7a64fbb4069d 800 igmp_ip_output_if( p, &src, dest, IGMP_TTL, IP_PROTO_IGMP, group->interface);
screamer 0:7a64fbb4069d 801 }
screamer 0:7a64fbb4069d 802
screamer 0:7a64fbb4069d 803 pbuf_free (p);
screamer 0:7a64fbb4069d 804 } else {
screamer 0:7a64fbb4069d 805 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
screamer 0:7a64fbb4069d 806 }
screamer 0:7a64fbb4069d 807 }
screamer 0:7a64fbb4069d 808
screamer 0:7a64fbb4069d 809 #endif /* LWIP_IGMP */