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core/ipv4/igmp.c@0:51ac1d130fd4, 2012-06-22 (annotated)

Committer:
mbed_official
Date:
Fri Jun 22 09:25:39 2012 +0000
Revision:
0:51ac1d130fd4
Child:
8:f9d0ac9dd036
Initial import from lwip-1.4.0: http://download.savannah.gnu.org/releases/lwip/lwip-1.4.0.zip

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /**
mbed_official 0:51ac1d130fd4 2 * @file
mbed_official 0:51ac1d130fd4 3 * IGMP - Internet Group Management Protocol
mbed_official 0:51ac1d130fd4 4 *
mbed_official 0:51ac1d130fd4 5 */
mbed_official 0:51ac1d130fd4 6
mbed_official 0:51ac1d130fd4 7 /*
mbed_official 0:51ac1d130fd4 8 * Copyright (c) 2002 CITEL Technologies Ltd.
mbed_official 0:51ac1d130fd4 9 * All rights reserved.
mbed_official 0:51ac1d130fd4 10 *
mbed_official 0:51ac1d130fd4 11 * Redistribution and use in source and binary forms, with or without
mbed_official 0:51ac1d130fd4 12 * modification, are permitted provided that the following conditions
mbed_official 0:51ac1d130fd4 13 * are met:
mbed_official 0:51ac1d130fd4 14 * 1. Redistributions of source code must retain the above copyright
mbed_official 0:51ac1d130fd4 15 * notice, this list of conditions and the following disclaimer.
mbed_official 0:51ac1d130fd4 16 * 2. Redistributions in binary form must reproduce the above copyright
mbed_official 0:51ac1d130fd4 17 * notice, this list of conditions and the following disclaimer in the
mbed_official 0:51ac1d130fd4 18 * documentation and/or other materials provided with the distribution.
mbed_official 0:51ac1d130fd4 19 * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
mbed_official 0:51ac1d130fd4 20 * may be used to endorse or promote products derived from this software
mbed_official 0:51ac1d130fd4 21 * without specific prior written permission.
mbed_official 0:51ac1d130fd4 22 *
mbed_official 0:51ac1d130fd4 23 * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
mbed_official 0:51ac1d130fd4 24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 0:51ac1d130fd4 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
mbed_official 0:51ac1d130fd4 26 * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
mbed_official 0:51ac1d130fd4 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 0:51ac1d130fd4 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
mbed_official 0:51ac1d130fd4 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
mbed_official 0:51ac1d130fd4 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
mbed_official 0:51ac1d130fd4 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
mbed_official 0:51ac1d130fd4 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
mbed_official 0:51ac1d130fd4 33 * SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 34 *
mbed_official 0:51ac1d130fd4 35 * This file is a contribution to the lwIP TCP/IP stack.
mbed_official 0:51ac1d130fd4 36 * The Swedish Institute of Computer Science and Adam Dunkels
mbed_official 0:51ac1d130fd4 37 * are specifically granted permission to redistribute this
mbed_official 0:51ac1d130fd4 38 * source code.
mbed_official 0:51ac1d130fd4 39 */
mbed_official 0:51ac1d130fd4 40
mbed_official 0:51ac1d130fd4 41 /*-------------------------------------------------------------
mbed_official 0:51ac1d130fd4 42 Note 1)
mbed_official 0:51ac1d130fd4 43 Although the rfc requires V1 AND V2 capability
mbed_official 0:51ac1d130fd4 44 we will only support v2 since now V1 is very old (August 1989)
mbed_official 0:51ac1d130fd4 45 V1 can be added if required
mbed_official 0:51ac1d130fd4 46
mbed_official 0:51ac1d130fd4 47 a debug print and statistic have been implemented to
mbed_official 0:51ac1d130fd4 48 show this up.
mbed_official 0:51ac1d130fd4 49 -------------------------------------------------------------
mbed_official 0:51ac1d130fd4 50 -------------------------------------------------------------
mbed_official 0:51ac1d130fd4 51 Note 2)
mbed_official 0:51ac1d130fd4 52 A query for a specific group address (as opposed to ALLHOSTS)
mbed_official 0:51ac1d130fd4 53 has now been implemented as I am unsure if it is required
mbed_official 0:51ac1d130fd4 54
mbed_official 0:51ac1d130fd4 55 a debug print and statistic have been implemented to
mbed_official 0:51ac1d130fd4 56 show this up.
mbed_official 0:51ac1d130fd4 57 -------------------------------------------------------------
mbed_official 0:51ac1d130fd4 58 -------------------------------------------------------------
mbed_official 0:51ac1d130fd4 59 Note 3)
mbed_official 0:51ac1d130fd4 60 The router alert rfc 2113 is implemented in outgoing packets
mbed_official 0:51ac1d130fd4 61 but not checked rigorously incoming
mbed_official 0:51ac1d130fd4 62 -------------------------------------------------------------
mbed_official 0:51ac1d130fd4 63 Steve Reynolds
mbed_official 0:51ac1d130fd4 64 ------------------------------------------------------------*/
mbed_official 0:51ac1d130fd4 65
mbed_official 0:51ac1d130fd4 66 /*-----------------------------------------------------------------------------
mbed_official 0:51ac1d130fd4 67 * RFC 988 - Host extensions for IP multicasting - V0
mbed_official 0:51ac1d130fd4 68 * RFC 1054 - Host extensions for IP multicasting -
mbed_official 0:51ac1d130fd4 69 * RFC 1112 - Host extensions for IP multicasting - V1
mbed_official 0:51ac1d130fd4 70 * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
mbed_official 0:51ac1d130fd4 71 * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
mbed_official 0:51ac1d130fd4 72 * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
mbed_official 0:51ac1d130fd4 73 * RFC 2113 - IP Router Alert Option -
mbed_official 0:51ac1d130fd4 74 *----------------------------------------------------------------------------*/
mbed_official 0:51ac1d130fd4 75
mbed_official 0:51ac1d130fd4 76 /*-----------------------------------------------------------------------------
mbed_official 0:51ac1d130fd4 77 * Includes
mbed_official 0:51ac1d130fd4 78 *----------------------------------------------------------------------------*/
mbed_official 0:51ac1d130fd4 79
mbed_official 0:51ac1d130fd4 80 #include "lwip/opt.h"
mbed_official 0:51ac1d130fd4 81
mbed_official 0:51ac1d130fd4 82 #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
mbed_official 0:51ac1d130fd4 83
mbed_official 0:51ac1d130fd4 84 #include "lwip/igmp.h"
mbed_official 0:51ac1d130fd4 85 #include "lwip/debug.h"
mbed_official 0:51ac1d130fd4 86 #include "lwip/def.h"
mbed_official 0:51ac1d130fd4 87 #include "lwip/mem.h"
mbed_official 0:51ac1d130fd4 88 #include "lwip/ip.h"
mbed_official 0:51ac1d130fd4 89 #include "lwip/inet_chksum.h"
mbed_official 0:51ac1d130fd4 90 #include "lwip/netif.h"
mbed_official 0:51ac1d130fd4 91 #include "lwip/icmp.h"
mbed_official 0:51ac1d130fd4 92 #include "lwip/udp.h"
mbed_official 0:51ac1d130fd4 93 #include "lwip/tcp.h"
mbed_official 0:51ac1d130fd4 94 #include "lwip/stats.h"
mbed_official 0:51ac1d130fd4 95
mbed_official 0:51ac1d130fd4 96 #include "string.h"
mbed_official 0:51ac1d130fd4 97
mbed_official 0:51ac1d130fd4 98 /*
mbed_official 0:51ac1d130fd4 99 * IGMP constants
mbed_official 0:51ac1d130fd4 100 */
mbed_official 0:51ac1d130fd4 101 #define IGMP_TTL 1
mbed_official 0:51ac1d130fd4 102 #define IGMP_MINLEN 8
mbed_official 0:51ac1d130fd4 103 #define ROUTER_ALERT 0x9404U
mbed_official 0:51ac1d130fd4 104 #define ROUTER_ALERTLEN 4
mbed_official 0:51ac1d130fd4 105
mbed_official 0:51ac1d130fd4 106 /*
mbed_official 0:51ac1d130fd4 107 * IGMP message types, including version number.
mbed_official 0:51ac1d130fd4 108 */
mbed_official 0:51ac1d130fd4 109 #define IGMP_MEMB_QUERY 0x11 /* Membership query */
mbed_official 0:51ac1d130fd4 110 #define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
mbed_official 0:51ac1d130fd4 111 #define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
mbed_official 0:51ac1d130fd4 112 #define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
mbed_official 0:51ac1d130fd4 113
mbed_official 0:51ac1d130fd4 114 /* Group membership states */
mbed_official 0:51ac1d130fd4 115 #define IGMP_GROUP_NON_MEMBER 0
mbed_official 0:51ac1d130fd4 116 #define IGMP_GROUP_DELAYING_MEMBER 1
mbed_official 0:51ac1d130fd4 117 #define IGMP_GROUP_IDLE_MEMBER 2
mbed_official 0:51ac1d130fd4 118
mbed_official 0:51ac1d130fd4 119 /**
mbed_official 0:51ac1d130fd4 120 * IGMP packet format.
mbed_official 0:51ac1d130fd4 121 */
mbed_official 0:51ac1d130fd4 122 #ifdef PACK_STRUCT_USE_INCLUDES
mbed_official 0:51ac1d130fd4 123 # include "arch/bpstruct.h"
mbed_official 0:51ac1d130fd4 124 #endif
mbed_official 0:51ac1d130fd4 125 PACK_STRUCT_BEGIN
mbed_official 0:51ac1d130fd4 126 struct igmp_msg {
mbed_official 0:51ac1d130fd4 127 PACK_STRUCT_FIELD(u8_t igmp_msgtype);
mbed_official 0:51ac1d130fd4 128 PACK_STRUCT_FIELD(u8_t igmp_maxresp);
mbed_official 0:51ac1d130fd4 129 PACK_STRUCT_FIELD(u16_t igmp_checksum);
mbed_official 0:51ac1d130fd4 130 PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
mbed_official 0:51ac1d130fd4 131 } PACK_STRUCT_STRUCT;
mbed_official 0:51ac1d130fd4 132 PACK_STRUCT_END
mbed_official 0:51ac1d130fd4 133 #ifdef PACK_STRUCT_USE_INCLUDES
mbed_official 0:51ac1d130fd4 134 # include "arch/epstruct.h"
mbed_official 0:51ac1d130fd4 135 #endif
mbed_official 0:51ac1d130fd4 136
mbed_official 0:51ac1d130fd4 137
mbed_official 0:51ac1d130fd4 138 static struct igmp_group *igmp_lookup_group(struct netif *ifp, ip_addr_t *addr);
mbed_official 0:51ac1d130fd4 139 static err_t igmp_remove_group(struct igmp_group *group);
mbed_official 0:51ac1d130fd4 140 static void igmp_timeout( struct igmp_group *group);
mbed_official 0:51ac1d130fd4 141 static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
mbed_official 0:51ac1d130fd4 142 static void igmp_stop_timer(struct igmp_group *group);
mbed_official 0:51ac1d130fd4 143 static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
mbed_official 0:51ac1d130fd4 144 static err_t igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif);
mbed_official 0:51ac1d130fd4 145 static void igmp_send(struct igmp_group *group, u8_t type);
mbed_official 0:51ac1d130fd4 146
mbed_official 0:51ac1d130fd4 147
mbed_official 0:51ac1d130fd4 148 static struct igmp_group* igmp_group_list;
mbed_official 0:51ac1d130fd4 149 static ip_addr_t allsystems;
mbed_official 0:51ac1d130fd4 150 static ip_addr_t allrouters;
mbed_official 0:51ac1d130fd4 151
mbed_official 0:51ac1d130fd4 152
mbed_official 0:51ac1d130fd4 153 /**
mbed_official 0:51ac1d130fd4 154 * Initialize the IGMP module
mbed_official 0:51ac1d130fd4 155 */
mbed_official 0:51ac1d130fd4 156 void
mbed_official 0:51ac1d130fd4 157 igmp_init(void)
mbed_official 0:51ac1d130fd4 158 {
mbed_official 0:51ac1d130fd4 159 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
mbed_official 0:51ac1d130fd4 160
mbed_official 0:51ac1d130fd4 161 IP4_ADDR(&allsystems, 224, 0, 0, 1);
mbed_official 0:51ac1d130fd4 162 IP4_ADDR(&allrouters, 224, 0, 0, 2);
mbed_official 0:51ac1d130fd4 163 }
mbed_official 0:51ac1d130fd4 164
mbed_official 0:51ac1d130fd4 165 #ifdef LWIP_DEBUG
mbed_official 0:51ac1d130fd4 166 /**
mbed_official 0:51ac1d130fd4 167 * Dump global IGMP groups list
mbed_official 0:51ac1d130fd4 168 */
mbed_official 0:51ac1d130fd4 169 void
mbed_official 0:51ac1d130fd4 170 igmp_dump_group_list()
mbed_official 0:51ac1d130fd4 171 {
mbed_official 0:51ac1d130fd4 172 struct igmp_group *group = igmp_group_list;
mbed_official 0:51ac1d130fd4 173
mbed_official 0:51ac1d130fd4 174 while (group != NULL) {
mbed_official 0:51ac1d130fd4 175 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
mbed_official 0:51ac1d130fd4 176 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
mbed_official 0:51ac1d130fd4 177 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
mbed_official 0:51ac1d130fd4 178 group = group->next;
mbed_official 0:51ac1d130fd4 179 }
mbed_official 0:51ac1d130fd4 180 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
mbed_official 0:51ac1d130fd4 181 }
mbed_official 0:51ac1d130fd4 182 #else
mbed_official 0:51ac1d130fd4 183 #define igmp_dump_group_list()
mbed_official 0:51ac1d130fd4 184 #endif /* LWIP_DEBUG */
mbed_official 0:51ac1d130fd4 185
mbed_official 0:51ac1d130fd4 186 /**
mbed_official 0:51ac1d130fd4 187 * Start IGMP processing on interface
mbed_official 0:51ac1d130fd4 188 *
mbed_official 0:51ac1d130fd4 189 * @param netif network interface on which start IGMP processing
mbed_official 0:51ac1d130fd4 190 */
mbed_official 0:51ac1d130fd4 191 err_t
mbed_official 0:51ac1d130fd4 192 igmp_start(struct netif *netif)
mbed_official 0:51ac1d130fd4 193 {
mbed_official 0:51ac1d130fd4 194 struct igmp_group* group;
mbed_official 0:51ac1d130fd4 195
mbed_official 0:51ac1d130fd4 196 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
mbed_official 0:51ac1d130fd4 197
mbed_official 0:51ac1d130fd4 198 group = igmp_lookup_group(netif, &allsystems);
mbed_official 0:51ac1d130fd4 199
mbed_official 0:51ac1d130fd4 200 if (group != NULL) {
mbed_official 0:51ac1d130fd4 201 group->group_state = IGMP_GROUP_IDLE_MEMBER;
mbed_official 0:51ac1d130fd4 202 group->use++;
mbed_official 0:51ac1d130fd4 203
mbed_official 0:51ac1d130fd4 204 /* Allow the igmp messages at the MAC level */
mbed_official 0:51ac1d130fd4 205 if (netif->igmp_mac_filter != NULL) {
mbed_official 0:51ac1d130fd4 206 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
mbed_official 0:51ac1d130fd4 207 ip_addr_debug_print(IGMP_DEBUG, &allsystems);
mbed_official 0:51ac1d130fd4 208 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
mbed_official 0:51ac1d130fd4 209 netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
mbed_official 0:51ac1d130fd4 210 }
mbed_official 0:51ac1d130fd4 211
mbed_official 0:51ac1d130fd4 212 return ERR_OK;
mbed_official 0:51ac1d130fd4 213 }
mbed_official 0:51ac1d130fd4 214
mbed_official 0:51ac1d130fd4 215 return ERR_MEM;
mbed_official 0:51ac1d130fd4 216 }
mbed_official 0:51ac1d130fd4 217
mbed_official 0:51ac1d130fd4 218 /**
mbed_official 0:51ac1d130fd4 219 * Stop IGMP processing on interface
mbed_official 0:51ac1d130fd4 220 *
mbed_official 0:51ac1d130fd4 221 * @param netif network interface on which stop IGMP processing
mbed_official 0:51ac1d130fd4 222 */
mbed_official 0:51ac1d130fd4 223 err_t
mbed_official 0:51ac1d130fd4 224 igmp_stop(struct netif *netif)
mbed_official 0:51ac1d130fd4 225 {
mbed_official 0:51ac1d130fd4 226 struct igmp_group *group = igmp_group_list;
mbed_official 0:51ac1d130fd4 227 struct igmp_group *prev = NULL;
mbed_official 0:51ac1d130fd4 228 struct igmp_group *next;
mbed_official 0:51ac1d130fd4 229
mbed_official 0:51ac1d130fd4 230 /* look for groups joined on this interface further down the list */
mbed_official 0:51ac1d130fd4 231 while (group != NULL) {
mbed_official 0:51ac1d130fd4 232 next = group->next;
mbed_official 0:51ac1d130fd4 233 /* is it a group joined on this interface? */
mbed_official 0:51ac1d130fd4 234 if (group->netif == netif) {
mbed_official 0:51ac1d130fd4 235 /* is it the first group of the list? */
mbed_official 0:51ac1d130fd4 236 if (group == igmp_group_list) {
mbed_official 0:51ac1d130fd4 237 igmp_group_list = next;
mbed_official 0:51ac1d130fd4 238 }
mbed_official 0:51ac1d130fd4 239 /* is there a "previous" group defined? */
mbed_official 0:51ac1d130fd4 240 if (prev != NULL) {
mbed_official 0:51ac1d130fd4 241 prev->next = next;
mbed_official 0:51ac1d130fd4 242 }
mbed_official 0:51ac1d130fd4 243 /* disable the group at the MAC level */
mbed_official 0:51ac1d130fd4 244 if (netif->igmp_mac_filter != NULL) {
mbed_official 0:51ac1d130fd4 245 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
mbed_official 0:51ac1d130fd4 246 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
mbed_official 0:51ac1d130fd4 247 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
mbed_official 0:51ac1d130fd4 248 netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
mbed_official 0:51ac1d130fd4 249 }
mbed_official 0:51ac1d130fd4 250 /* free group */
mbed_official 0:51ac1d130fd4 251 memp_free(MEMP_IGMP_GROUP, group);
mbed_official 0:51ac1d130fd4 252 } else {
mbed_official 0:51ac1d130fd4 253 /* change the "previous" */
mbed_official 0:51ac1d130fd4 254 prev = group;
mbed_official 0:51ac1d130fd4 255 }
mbed_official 0:51ac1d130fd4 256 /* move to "next" */
mbed_official 0:51ac1d130fd4 257 group = next;
mbed_official 0:51ac1d130fd4 258 }
mbed_official 0:51ac1d130fd4 259 return ERR_OK;
mbed_official 0:51ac1d130fd4 260 }
mbed_official 0:51ac1d130fd4 261
mbed_official 0:51ac1d130fd4 262 /**
mbed_official 0:51ac1d130fd4 263 * Report IGMP memberships for this interface
mbed_official 0:51ac1d130fd4 264 *
mbed_official 0:51ac1d130fd4 265 * @param netif network interface on which report IGMP memberships
mbed_official 0:51ac1d130fd4 266 */
mbed_official 0:51ac1d130fd4 267 void
mbed_official 0:51ac1d130fd4 268 igmp_report_groups(struct netif *netif)
mbed_official 0:51ac1d130fd4 269 {
mbed_official 0:51ac1d130fd4 270 struct igmp_group *group = igmp_group_list;
mbed_official 0:51ac1d130fd4 271
mbed_official 0:51ac1d130fd4 272 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
mbed_official 0:51ac1d130fd4 273
mbed_official 0:51ac1d130fd4 274 while (group != NULL) {
mbed_official 0:51ac1d130fd4 275 if (group->netif == netif) {
mbed_official 0:51ac1d130fd4 276 igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
mbed_official 0:51ac1d130fd4 277 }
mbed_official 0:51ac1d130fd4 278 group = group->next;
mbed_official 0:51ac1d130fd4 279 }
mbed_official 0:51ac1d130fd4 280 }
mbed_official 0:51ac1d130fd4 281
mbed_official 0:51ac1d130fd4 282 /**
mbed_official 0:51ac1d130fd4 283 * Search for a group in the global igmp_group_list
mbed_official 0:51ac1d130fd4 284 *
mbed_official 0:51ac1d130fd4 285 * @param ifp the network interface for which to look
mbed_official 0:51ac1d130fd4 286 * @param addr the group ip address to search for
mbed_official 0:51ac1d130fd4 287 * @return a struct igmp_group* if the group has been found,
mbed_official 0:51ac1d130fd4 288 * NULL if the group wasn't found.
mbed_official 0:51ac1d130fd4 289 */
mbed_official 0:51ac1d130fd4 290 struct igmp_group *
mbed_official 0:51ac1d130fd4 291 igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr)
mbed_official 0:51ac1d130fd4 292 {
mbed_official 0:51ac1d130fd4 293 struct igmp_group *group = igmp_group_list;
mbed_official 0:51ac1d130fd4 294
mbed_official 0:51ac1d130fd4 295 while (group != NULL) {
mbed_official 0:51ac1d130fd4 296 if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
mbed_official 0:51ac1d130fd4 297 return group;
mbed_official 0:51ac1d130fd4 298 }
mbed_official 0:51ac1d130fd4 299 group = group->next;
mbed_official 0:51ac1d130fd4 300 }
mbed_official 0:51ac1d130fd4 301
mbed_official 0:51ac1d130fd4 302 /* to be clearer, we return NULL here instead of
mbed_official 0:51ac1d130fd4 303 * 'group' (which is also NULL at this point).
mbed_official 0:51ac1d130fd4 304 */
mbed_official 0:51ac1d130fd4 305 return NULL;
mbed_official 0:51ac1d130fd4 306 }
mbed_official 0:51ac1d130fd4 307
mbed_official 0:51ac1d130fd4 308 /**
mbed_official 0:51ac1d130fd4 309 * Search for a specific igmp group and create a new one if not found-
mbed_official 0:51ac1d130fd4 310 *
mbed_official 0:51ac1d130fd4 311 * @param ifp the network interface for which to look
mbed_official 0:51ac1d130fd4 312 * @param addr the group ip address to search
mbed_official 0:51ac1d130fd4 313 * @return a struct igmp_group*,
mbed_official 0:51ac1d130fd4 314 * NULL on memory error.
mbed_official 0:51ac1d130fd4 315 */
mbed_official 0:51ac1d130fd4 316 struct igmp_group *
mbed_official 0:51ac1d130fd4 317 igmp_lookup_group(struct netif *ifp, ip_addr_t *addr)
mbed_official 0:51ac1d130fd4 318 {
mbed_official 0:51ac1d130fd4 319 struct igmp_group *group = igmp_group_list;
mbed_official 0:51ac1d130fd4 320
mbed_official 0:51ac1d130fd4 321 /* Search if the group already exists */
mbed_official 0:51ac1d130fd4 322 group = igmp_lookfor_group(ifp, addr);
mbed_official 0:51ac1d130fd4 323 if (group != NULL) {
mbed_official 0:51ac1d130fd4 324 /* Group already exists. */
mbed_official 0:51ac1d130fd4 325 return group;
mbed_official 0:51ac1d130fd4 326 }
mbed_official 0:51ac1d130fd4 327
mbed_official 0:51ac1d130fd4 328 /* Group doesn't exist yet, create a new one */
mbed_official 0:51ac1d130fd4 329 group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
mbed_official 0:51ac1d130fd4 330 if (group != NULL) {
mbed_official 0:51ac1d130fd4 331 group->netif = ifp;
mbed_official 0:51ac1d130fd4 332 ip_addr_set(&(group->group_address), addr);
mbed_official 0:51ac1d130fd4 333 group->timer = 0; /* Not running */
mbed_official 0:51ac1d130fd4 334 group->group_state = IGMP_GROUP_NON_MEMBER;
mbed_official 0:51ac1d130fd4 335 group->last_reporter_flag = 0;
mbed_official 0:51ac1d130fd4 336 group->use = 0;
mbed_official 0:51ac1d130fd4 337 group->next = igmp_group_list;
mbed_official 0:51ac1d130fd4 338
mbed_official 0:51ac1d130fd4 339 igmp_group_list = group;
mbed_official 0:51ac1d130fd4 340 }
mbed_official 0:51ac1d130fd4 341
mbed_official 0:51ac1d130fd4 342 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
mbed_official 0:51ac1d130fd4 343 ip_addr_debug_print(IGMP_DEBUG, addr);
mbed_official 0:51ac1d130fd4 344 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
mbed_official 0:51ac1d130fd4 345
mbed_official 0:51ac1d130fd4 346 return group;
mbed_official 0:51ac1d130fd4 347 }
mbed_official 0:51ac1d130fd4 348
mbed_official 0:51ac1d130fd4 349 /**
mbed_official 0:51ac1d130fd4 350 * Remove a group in the global igmp_group_list
mbed_official 0:51ac1d130fd4 351 *
mbed_official 0:51ac1d130fd4 352 * @param group the group to remove from the global igmp_group_list
mbed_official 0:51ac1d130fd4 353 * @return ERR_OK if group was removed from the list, an err_t otherwise
mbed_official 0:51ac1d130fd4 354 */
mbed_official 0:51ac1d130fd4 355 static err_t
mbed_official 0:51ac1d130fd4 356 igmp_remove_group(struct igmp_group *group)
mbed_official 0:51ac1d130fd4 357 {
mbed_official 0:51ac1d130fd4 358 err_t err = ERR_OK;
mbed_official 0:51ac1d130fd4 359
mbed_official 0:51ac1d130fd4 360 /* Is it the first group? */
mbed_official 0:51ac1d130fd4 361 if (igmp_group_list == group) {
mbed_official 0:51ac1d130fd4 362 igmp_group_list = group->next;
mbed_official 0:51ac1d130fd4 363 } else {
mbed_official 0:51ac1d130fd4 364 /* look for group further down the list */
mbed_official 0:51ac1d130fd4 365 struct igmp_group *tmpGroup;
mbed_official 0:51ac1d130fd4 366 for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
mbed_official 0:51ac1d130fd4 367 if (tmpGroup->next == group) {
mbed_official 0:51ac1d130fd4 368 tmpGroup->next = group->next;
mbed_official 0:51ac1d130fd4 369 break;
mbed_official 0:51ac1d130fd4 370 }
mbed_official 0:51ac1d130fd4 371 }
mbed_official 0:51ac1d130fd4 372 /* Group not found in the global igmp_group_list */
mbed_official 0:51ac1d130fd4 373 if (tmpGroup == NULL)
mbed_official 0:51ac1d130fd4 374 err = ERR_ARG;
mbed_official 0:51ac1d130fd4 375 }
mbed_official 0:51ac1d130fd4 376 /* free group */
mbed_official 0:51ac1d130fd4 377 memp_free(MEMP_IGMP_GROUP, group);
mbed_official 0:51ac1d130fd4 378
mbed_official 0:51ac1d130fd4 379 return err;
mbed_official 0:51ac1d130fd4 380 }
mbed_official 0:51ac1d130fd4 381
mbed_official 0:51ac1d130fd4 382 /**
mbed_official 0:51ac1d130fd4 383 * Called from ip_input() if a new IGMP packet is received.
mbed_official 0:51ac1d130fd4 384 *
mbed_official 0:51ac1d130fd4 385 * @param p received igmp packet, p->payload pointing to the ip header
mbed_official 0:51ac1d130fd4 386 * @param inp network interface on which the packet was received
mbed_official 0:51ac1d130fd4 387 * @param dest destination ip address of the igmp packet
mbed_official 0:51ac1d130fd4 388 */
mbed_official 0:51ac1d130fd4 389 void
mbed_official 0:51ac1d130fd4 390 igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest)
mbed_official 0:51ac1d130fd4 391 {
mbed_official 0:51ac1d130fd4 392 struct ip_hdr * iphdr;
mbed_official 0:51ac1d130fd4 393 struct igmp_msg* igmp;
mbed_official 0:51ac1d130fd4 394 struct igmp_group* group;
mbed_official 0:51ac1d130fd4 395 struct igmp_group* groupref;
mbed_official 0:51ac1d130fd4 396
mbed_official 0:51ac1d130fd4 397 IGMP_STATS_INC(igmp.recv);
mbed_official 0:51ac1d130fd4 398
mbed_official 0:51ac1d130fd4 399 /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
mbed_official 0:51ac1d130fd4 400 iphdr = (struct ip_hdr *)p->payload;
mbed_official 0:51ac1d130fd4 401 if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
mbed_official 0:51ac1d130fd4 402 pbuf_free(p);
mbed_official 0:51ac1d130fd4 403 IGMP_STATS_INC(igmp.lenerr);
mbed_official 0:51ac1d130fd4 404 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
mbed_official 0:51ac1d130fd4 405 return;
mbed_official 0:51ac1d130fd4 406 }
mbed_official 0:51ac1d130fd4 407
mbed_official 0:51ac1d130fd4 408 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
mbed_official 0:51ac1d130fd4 409 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
mbed_official 0:51ac1d130fd4 410 LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
mbed_official 0:51ac1d130fd4 411 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
mbed_official 0:51ac1d130fd4 412 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
mbed_official 0:51ac1d130fd4 413
mbed_official 0:51ac1d130fd4 414 /* Now calculate and check the checksum */
mbed_official 0:51ac1d130fd4 415 igmp = (struct igmp_msg *)p->payload;
mbed_official 0:51ac1d130fd4 416 if (inet_chksum(igmp, p->len)) {
mbed_official 0:51ac1d130fd4 417 pbuf_free(p);
mbed_official 0:51ac1d130fd4 418 IGMP_STATS_INC(igmp.chkerr);
mbed_official 0:51ac1d130fd4 419 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
mbed_official 0:51ac1d130fd4 420 return;
mbed_official 0:51ac1d130fd4 421 }
mbed_official 0:51ac1d130fd4 422
mbed_official 0:51ac1d130fd4 423 /* Packet is ok so find an existing group */
mbed_official 0:51ac1d130fd4 424 group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
mbed_official 0:51ac1d130fd4 425
mbed_official 0:51ac1d130fd4 426 /* If group can be found or create... */
mbed_official 0:51ac1d130fd4 427 if (!group) {
mbed_official 0:51ac1d130fd4 428 pbuf_free(p);
mbed_official 0:51ac1d130fd4 429 IGMP_STATS_INC(igmp.drop);
mbed_official 0:51ac1d130fd4 430 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
mbed_official 0:51ac1d130fd4 431 return;
mbed_official 0:51ac1d130fd4 432 }
mbed_official 0:51ac1d130fd4 433
mbed_official 0:51ac1d130fd4 434 /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
mbed_official 0:51ac1d130fd4 435 switch (igmp->igmp_msgtype) {
mbed_official 0:51ac1d130fd4 436 case IGMP_MEMB_QUERY: {
mbed_official 0:51ac1d130fd4 437 /* IGMP_MEMB_QUERY to the "all systems" address ? */
mbed_official 0:51ac1d130fd4 438 if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
mbed_official 0:51ac1d130fd4 439 /* THIS IS THE GENERAL QUERY */
mbed_official 0:51ac1d130fd4 440 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
mbed_official 0:51ac1d130fd4 441
mbed_official 0:51ac1d130fd4 442 if (igmp->igmp_maxresp == 0) {
mbed_official 0:51ac1d130fd4 443 IGMP_STATS_INC(igmp.rx_v1);
mbed_official 0:51ac1d130fd4 444 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
mbed_official 0:51ac1d130fd4 445 igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
mbed_official 0:51ac1d130fd4 446 } else {
mbed_official 0:51ac1d130fd4 447 IGMP_STATS_INC(igmp.rx_general);
mbed_official 0:51ac1d130fd4 448 }
mbed_official 0:51ac1d130fd4 449
mbed_official 0:51ac1d130fd4 450 groupref = igmp_group_list;
mbed_official 0:51ac1d130fd4 451 while (groupref) {
mbed_official 0:51ac1d130fd4 452 /* Do not send messages on the all systems group address! */
mbed_official 0:51ac1d130fd4 453 if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
mbed_official 0:51ac1d130fd4 454 igmp_delaying_member(groupref, igmp->igmp_maxresp);
mbed_official 0:51ac1d130fd4 455 }
mbed_official 0:51ac1d130fd4 456 groupref = groupref->next;
mbed_official 0:51ac1d130fd4 457 }
mbed_official 0:51ac1d130fd4 458 } else {
mbed_official 0:51ac1d130fd4 459 /* IGMP_MEMB_QUERY to a specific group ? */
mbed_official 0:51ac1d130fd4 460 if (!ip_addr_isany(&igmp->igmp_group_address)) {
mbed_official 0:51ac1d130fd4 461 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
mbed_official 0:51ac1d130fd4 462 ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
mbed_official 0:51ac1d130fd4 463 if (ip_addr_cmp(dest, &allsystems)) {
mbed_official 0:51ac1d130fd4 464 ip_addr_t groupaddr;
mbed_official 0:51ac1d130fd4 465 LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
mbed_official 0:51ac1d130fd4 466 /* we first need to re-look for the group since we used dest last time */
mbed_official 0:51ac1d130fd4 467 ip_addr_copy(groupaddr, igmp->igmp_group_address);
mbed_official 0:51ac1d130fd4 468 group = igmp_lookfor_group(inp, &groupaddr);
mbed_official 0:51ac1d130fd4 469 } else {
mbed_official 0:51ac1d130fd4 470 LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
mbed_official 0:51ac1d130fd4 471 }
mbed_official 0:51ac1d130fd4 472
mbed_official 0:51ac1d130fd4 473 if (group != NULL) {
mbed_official 0:51ac1d130fd4 474 IGMP_STATS_INC(igmp.rx_group);
mbed_official 0:51ac1d130fd4 475 igmp_delaying_member(group, igmp->igmp_maxresp);
mbed_official 0:51ac1d130fd4 476 } else {
mbed_official 0:51ac1d130fd4 477 IGMP_STATS_INC(igmp.drop);
mbed_official 0:51ac1d130fd4 478 }
mbed_official 0:51ac1d130fd4 479 } else {
mbed_official 0:51ac1d130fd4 480 IGMP_STATS_INC(igmp.proterr);
mbed_official 0:51ac1d130fd4 481 }
mbed_official 0:51ac1d130fd4 482 }
mbed_official 0:51ac1d130fd4 483 break;
mbed_official 0:51ac1d130fd4 484 }
mbed_official 0:51ac1d130fd4 485 case IGMP_V2_MEMB_REPORT: {
mbed_official 0:51ac1d130fd4 486 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
mbed_official 0:51ac1d130fd4 487 IGMP_STATS_INC(igmp.rx_report);
mbed_official 0:51ac1d130fd4 488 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
mbed_official 0:51ac1d130fd4 489 /* This is on a specific group we have already looked up */
mbed_official 0:51ac1d130fd4 490 group->timer = 0; /* stopped */
mbed_official 0:51ac1d130fd4 491 group->group_state = IGMP_GROUP_IDLE_MEMBER;
mbed_official 0:51ac1d130fd4 492 group->last_reporter_flag = 0;
mbed_official 0:51ac1d130fd4 493 }
mbed_official 0:51ac1d130fd4 494 break;
mbed_official 0:51ac1d130fd4 495 }
mbed_official 0:51ac1d130fd4 496 default: {
mbed_official 0:51ac1d130fd4 497 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
mbed_official 0:51ac1d130fd4 498 igmp->igmp_msgtype, group->group_state, &group, group->netif));
mbed_official 0:51ac1d130fd4 499 IGMP_STATS_INC(igmp.proterr);
mbed_official 0:51ac1d130fd4 500 break;
mbed_official 0:51ac1d130fd4 501 }
mbed_official 0:51ac1d130fd4 502 }
mbed_official 0:51ac1d130fd4 503
mbed_official 0:51ac1d130fd4 504 pbuf_free(p);
mbed_official 0:51ac1d130fd4 505 return;
mbed_official 0:51ac1d130fd4 506 }
mbed_official 0:51ac1d130fd4 507
mbed_official 0:51ac1d130fd4 508 /**
mbed_official 0:51ac1d130fd4 509 * Join a group on one network interface.
mbed_official 0:51ac1d130fd4 510 *
mbed_official 0:51ac1d130fd4 511 * @param ifaddr ip address of the network interface which should join a new group
mbed_official 0:51ac1d130fd4 512 * @param groupaddr the ip address of the group which to join
mbed_official 0:51ac1d130fd4 513 * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
mbed_official 0:51ac1d130fd4 514 */
mbed_official 0:51ac1d130fd4 515 err_t
mbed_official 0:51ac1d130fd4 516 igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
mbed_official 0:51ac1d130fd4 517 {
mbed_official 0:51ac1d130fd4 518 err_t err = ERR_VAL; /* no matching interface */
mbed_official 0:51ac1d130fd4 519 struct igmp_group *group;
mbed_official 0:51ac1d130fd4 520 struct netif *netif;
mbed_official 0:51ac1d130fd4 521
mbed_official 0:51ac1d130fd4 522 /* make sure it is multicast address */
mbed_official 0:51ac1d130fd4 523 LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
mbed_official 0:51ac1d130fd4 524 LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
mbed_official 0:51ac1d130fd4 525
mbed_official 0:51ac1d130fd4 526 /* loop through netif's */
mbed_official 0:51ac1d130fd4 527 netif = netif_list;
mbed_official 0:51ac1d130fd4 528 while (netif != NULL) {
mbed_official 0:51ac1d130fd4 529 /* Should we join this interface ? */
mbed_official 0:51ac1d130fd4 530 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
mbed_official 0:51ac1d130fd4 531 /* find group or create a new one if not found */
mbed_official 0:51ac1d130fd4 532 group = igmp_lookup_group(netif, groupaddr);
mbed_official 0:51ac1d130fd4 533
mbed_official 0:51ac1d130fd4 534 if (group != NULL) {
mbed_official 0:51ac1d130fd4 535 /* This should create a new group, check the state to make sure */
mbed_official 0:51ac1d130fd4 536 if (group->group_state != IGMP_GROUP_NON_MEMBER) {
mbed_official 0:51ac1d130fd4 537 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
mbed_official 0:51ac1d130fd4 538 } else {
mbed_official 0:51ac1d130fd4 539 /* OK - it was new group */
mbed_official 0:51ac1d130fd4 540 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
mbed_official 0:51ac1d130fd4 541 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
mbed_official 0:51ac1d130fd4 542 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
mbed_official 0:51ac1d130fd4 543
mbed_official 0:51ac1d130fd4 544 /* If first use of the group, allow the group at the MAC level */
mbed_official 0:51ac1d130fd4 545 if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
mbed_official 0:51ac1d130fd4 546 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
mbed_official 0:51ac1d130fd4 547 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
mbed_official 0:51ac1d130fd4 548 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
mbed_official 0:51ac1d130fd4 549 netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
mbed_official 0:51ac1d130fd4 550 }
mbed_official 0:51ac1d130fd4 551
mbed_official 0:51ac1d130fd4 552 IGMP_STATS_INC(igmp.tx_join);
mbed_official 0:51ac1d130fd4 553 igmp_send(group, IGMP_V2_MEMB_REPORT);
mbed_official 0:51ac1d130fd4 554
mbed_official 0:51ac1d130fd4 555 igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
mbed_official 0:51ac1d130fd4 556
mbed_official 0:51ac1d130fd4 557 /* Need to work out where this timer comes from */
mbed_official 0:51ac1d130fd4 558 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
mbed_official 0:51ac1d130fd4 559 }
mbed_official 0:51ac1d130fd4 560 /* Increment group use */
mbed_official 0:51ac1d130fd4 561 group->use++;
mbed_official 0:51ac1d130fd4 562 /* Join on this interface */
mbed_official 0:51ac1d130fd4 563 err = ERR_OK;
mbed_official 0:51ac1d130fd4 564 } else {
mbed_official 0:51ac1d130fd4 565 /* Return an error even if some network interfaces are joined */
mbed_official 0:51ac1d130fd4 566 /** @todo undo any other netif already joined */
mbed_official 0:51ac1d130fd4 567 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
mbed_official 0:51ac1d130fd4 568 return ERR_MEM;
mbed_official 0:51ac1d130fd4 569 }
mbed_official 0:51ac1d130fd4 570 }
mbed_official 0:51ac1d130fd4 571 /* proceed to next network interface */
mbed_official 0:51ac1d130fd4 572 netif = netif->next;
mbed_official 0:51ac1d130fd4 573 }
mbed_official 0:51ac1d130fd4 574
mbed_official 0:51ac1d130fd4 575 return err;
mbed_official 0:51ac1d130fd4 576 }
mbed_official 0:51ac1d130fd4 577
mbed_official 0:51ac1d130fd4 578 /**
mbed_official 0:51ac1d130fd4 579 * Leave a group on one network interface.
mbed_official 0:51ac1d130fd4 580 *
mbed_official 0:51ac1d130fd4 581 * @param ifaddr ip address of the network interface which should leave a group
mbed_official 0:51ac1d130fd4 582 * @param groupaddr the ip address of the group which to leave
mbed_official 0:51ac1d130fd4 583 * @return ERR_OK if group was left on the netif(s), an err_t otherwise
mbed_official 0:51ac1d130fd4 584 */
mbed_official 0:51ac1d130fd4 585 err_t
mbed_official 0:51ac1d130fd4 586 igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
mbed_official 0:51ac1d130fd4 587 {
mbed_official 0:51ac1d130fd4 588 err_t err = ERR_VAL; /* no matching interface */
mbed_official 0:51ac1d130fd4 589 struct igmp_group *group;
mbed_official 0:51ac1d130fd4 590 struct netif *netif;
mbed_official 0:51ac1d130fd4 591
mbed_official 0:51ac1d130fd4 592 /* make sure it is multicast address */
mbed_official 0:51ac1d130fd4 593 LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
mbed_official 0:51ac1d130fd4 594 LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
mbed_official 0:51ac1d130fd4 595
mbed_official 0:51ac1d130fd4 596 /* loop through netif's */
mbed_official 0:51ac1d130fd4 597 netif = netif_list;
mbed_official 0:51ac1d130fd4 598 while (netif != NULL) {
mbed_official 0:51ac1d130fd4 599 /* Should we leave this interface ? */
mbed_official 0:51ac1d130fd4 600 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
mbed_official 0:51ac1d130fd4 601 /* find group */
mbed_official 0:51ac1d130fd4 602 group = igmp_lookfor_group(netif, groupaddr);
mbed_official 0:51ac1d130fd4 603
mbed_official 0:51ac1d130fd4 604 if (group != NULL) {
mbed_official 0:51ac1d130fd4 605 /* Only send a leave if the flag is set according to the state diagram */
mbed_official 0:51ac1d130fd4 606 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
mbed_official 0:51ac1d130fd4 607 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
mbed_official 0:51ac1d130fd4 608 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
mbed_official 0:51ac1d130fd4 609
mbed_official 0:51ac1d130fd4 610 /* If there is no other use of the group */
mbed_official 0:51ac1d130fd4 611 if (group->use <= 1) {
mbed_official 0:51ac1d130fd4 612 /* If we are the last reporter for this group */
mbed_official 0:51ac1d130fd4 613 if (group->last_reporter_flag) {
mbed_official 0:51ac1d130fd4 614 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
mbed_official 0:51ac1d130fd4 615 IGMP_STATS_INC(igmp.tx_leave);
mbed_official 0:51ac1d130fd4 616 igmp_send(group, IGMP_LEAVE_GROUP);
mbed_official 0:51ac1d130fd4 617 }
mbed_official 0:51ac1d130fd4 618
mbed_official 0:51ac1d130fd4 619 /* Disable the group at the MAC level */
mbed_official 0:51ac1d130fd4 620 if (netif->igmp_mac_filter != NULL) {
mbed_official 0:51ac1d130fd4 621 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
mbed_official 0:51ac1d130fd4 622 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
mbed_official 0:51ac1d130fd4 623 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
mbed_official 0:51ac1d130fd4 624 netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
mbed_official 0:51ac1d130fd4 625 }
mbed_official 0:51ac1d130fd4 626
mbed_official 0:51ac1d130fd4 627 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
mbed_official 0:51ac1d130fd4 628 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
mbed_official 0:51ac1d130fd4 629 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
mbed_official 0:51ac1d130fd4 630
mbed_official 0:51ac1d130fd4 631 /* Free the group */
mbed_official 0:51ac1d130fd4 632 igmp_remove_group(group);
mbed_official 0:51ac1d130fd4 633 } else {
mbed_official 0:51ac1d130fd4 634 /* Decrement group use */
mbed_official 0:51ac1d130fd4 635 group->use--;
mbed_official 0:51ac1d130fd4 636 }
mbed_official 0:51ac1d130fd4 637 /* Leave on this interface */
mbed_official 0:51ac1d130fd4 638 err = ERR_OK;
mbed_official 0:51ac1d130fd4 639 } else {
mbed_official 0:51ac1d130fd4 640 /* It's not a fatal error on "leavegroup" */
mbed_official 0:51ac1d130fd4 641 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
mbed_official 0:51ac1d130fd4 642 }
mbed_official 0:51ac1d130fd4 643 }
mbed_official 0:51ac1d130fd4 644 /* proceed to next network interface */
mbed_official 0:51ac1d130fd4 645 netif = netif->next;
mbed_official 0:51ac1d130fd4 646 }
mbed_official 0:51ac1d130fd4 647
mbed_official 0:51ac1d130fd4 648 return err;
mbed_official 0:51ac1d130fd4 649 }
mbed_official 0:51ac1d130fd4 650
mbed_official 0:51ac1d130fd4 651 /**
mbed_official 0:51ac1d130fd4 652 * The igmp timer function (both for NO_SYS=1 and =0)
mbed_official 0:51ac1d130fd4 653 * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
mbed_official 0:51ac1d130fd4 654 */
mbed_official 0:51ac1d130fd4 655 void
mbed_official 0:51ac1d130fd4 656 igmp_tmr(void)
mbed_official 0:51ac1d130fd4 657 {
mbed_official 0:51ac1d130fd4 658 struct igmp_group *group = igmp_group_list;
mbed_official 0:51ac1d130fd4 659
mbed_official 0:51ac1d130fd4 660 while (group != NULL) {
mbed_official 0:51ac1d130fd4 661 if (group->timer > 0) {
mbed_official 0:51ac1d130fd4 662 group->timer--;
mbed_official 0:51ac1d130fd4 663 if (group->timer == 0) {
mbed_official 0:51ac1d130fd4 664 igmp_timeout(group);
mbed_official 0:51ac1d130fd4 665 }
mbed_official 0:51ac1d130fd4 666 }
mbed_official 0:51ac1d130fd4 667 group = group->next;
mbed_official 0:51ac1d130fd4 668 }
mbed_official 0:51ac1d130fd4 669 }
mbed_official 0:51ac1d130fd4 670
mbed_official 0:51ac1d130fd4 671 /**
mbed_official 0:51ac1d130fd4 672 * Called if a timeout for one group is reached.
mbed_official 0:51ac1d130fd4 673 * Sends a report for this group.
mbed_official 0:51ac1d130fd4 674 *
mbed_official 0:51ac1d130fd4 675 * @param group an igmp_group for which a timeout is reached
mbed_official 0:51ac1d130fd4 676 */
mbed_official 0:51ac1d130fd4 677 static void
mbed_official 0:51ac1d130fd4 678 igmp_timeout(struct igmp_group *group)
mbed_official 0:51ac1d130fd4 679 {
mbed_official 0:51ac1d130fd4 680 /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
mbed_official 0:51ac1d130fd4 681 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
mbed_official 0:51ac1d130fd4 682 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
mbed_official 0:51ac1d130fd4 683 ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
mbed_official 0:51ac1d130fd4 684 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
mbed_official 0:51ac1d130fd4 685
mbed_official 0:51ac1d130fd4 686 IGMP_STATS_INC(igmp.tx_report);
mbed_official 0:51ac1d130fd4 687 igmp_send(group, IGMP_V2_MEMB_REPORT);
mbed_official 0:51ac1d130fd4 688 }
mbed_official 0:51ac1d130fd4 689 }
mbed_official 0:51ac1d130fd4 690
mbed_official 0:51ac1d130fd4 691 /**
mbed_official 0:51ac1d130fd4 692 * Start a timer for an igmp group
mbed_official 0:51ac1d130fd4 693 *
mbed_official 0:51ac1d130fd4 694 * @param group the igmp_group for which to start a timer
mbed_official 0:51ac1d130fd4 695 * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
mbed_official 0:51ac1d130fd4 696 * every call to igmp_tmr())
mbed_official 0:51ac1d130fd4 697 */
mbed_official 0:51ac1d130fd4 698 static void
mbed_official 0:51ac1d130fd4 699 igmp_start_timer(struct igmp_group *group, u8_t max_time)
mbed_official 0:51ac1d130fd4 700 {
mbed_official 0:51ac1d130fd4 701 /* ensure the input value is > 0 */
mbed_official 0:51ac1d130fd4 702 if (max_time == 0) {
mbed_official 0:51ac1d130fd4 703 max_time = 1;
mbed_official 0:51ac1d130fd4 704 }
mbed_official 0:51ac1d130fd4 705 /* ensure the random value is > 0 */
mbed_official 0:51ac1d130fd4 706 group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
mbed_official 0:51ac1d130fd4 707 }
mbed_official 0:51ac1d130fd4 708
mbed_official 0:51ac1d130fd4 709 /**
mbed_official 0:51ac1d130fd4 710 * Stop a timer for an igmp_group
mbed_official 0:51ac1d130fd4 711 *
mbed_official 0:51ac1d130fd4 712 * @param group the igmp_group for which to stop the timer
mbed_official 0:51ac1d130fd4 713 */
mbed_official 0:51ac1d130fd4 714 static void
mbed_official 0:51ac1d130fd4 715 igmp_stop_timer(struct igmp_group *group)
mbed_official 0:51ac1d130fd4 716 {
mbed_official 0:51ac1d130fd4 717 group->timer = 0;
mbed_official 0:51ac1d130fd4 718 }
mbed_official 0:51ac1d130fd4 719
mbed_official 0:51ac1d130fd4 720 /**
mbed_official 0:51ac1d130fd4 721 * Delaying membership report for a group if necessary
mbed_official 0:51ac1d130fd4 722 *
mbed_official 0:51ac1d130fd4 723 * @param group the igmp_group for which "delaying" membership report
mbed_official 0:51ac1d130fd4 724 * @param maxresp query delay
mbed_official 0:51ac1d130fd4 725 */
mbed_official 0:51ac1d130fd4 726 static void
mbed_official 0:51ac1d130fd4 727 igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
mbed_official 0:51ac1d130fd4 728 {
mbed_official 0:51ac1d130fd4 729 if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
mbed_official 0:51ac1d130fd4 730 ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
mbed_official 0:51ac1d130fd4 731 ((group->timer == 0) || (maxresp < group->timer)))) {
mbed_official 0:51ac1d130fd4 732 igmp_start_timer(group, maxresp);
mbed_official 0:51ac1d130fd4 733 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
mbed_official 0:51ac1d130fd4 734 }
mbed_official 0:51ac1d130fd4 735 }
mbed_official 0:51ac1d130fd4 736
mbed_official 0:51ac1d130fd4 737
mbed_official 0:51ac1d130fd4 738 /**
mbed_official 0:51ac1d130fd4 739 * Sends an IP packet on a network interface. This function constructs the IP header
mbed_official 0:51ac1d130fd4 740 * and calculates the IP header checksum. If the source IP address is NULL,
mbed_official 0:51ac1d130fd4 741 * the IP address of the outgoing network interface is filled in as source address.
mbed_official 0:51ac1d130fd4 742 *
mbed_official 0:51ac1d130fd4 743 * @param p the packet to send (p->payload points to the data, e.g. next
mbed_official 0:51ac1d130fd4 744 protocol header; if dest == IP_HDRINCL, p already includes an IP
mbed_official 0:51ac1d130fd4 745 header and p->payload points to that IP header)
mbed_official 0:51ac1d130fd4 746 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
mbed_official 0:51ac1d130fd4 747 * IP address of the netif used to send is used as source address)
mbed_official 0:51ac1d130fd4 748 * @param dest the destination IP address to send the packet to
mbed_official 0:51ac1d130fd4 749 * @param ttl the TTL value to be set in the IP header
mbed_official 0:51ac1d130fd4 750 * @param proto the PROTOCOL to be set in the IP header
mbed_official 0:51ac1d130fd4 751 * @param netif the netif on which to send this packet
mbed_official 0:51ac1d130fd4 752 * @return ERR_OK if the packet was sent OK
mbed_official 0:51ac1d130fd4 753 * ERR_BUF if p doesn't have enough space for IP/LINK headers
mbed_official 0:51ac1d130fd4 754 * returns errors returned by netif->output
mbed_official 0:51ac1d130fd4 755 */
mbed_official 0:51ac1d130fd4 756 static err_t
mbed_official 0:51ac1d130fd4 757 igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif)
mbed_official 0:51ac1d130fd4 758 {
mbed_official 0:51ac1d130fd4 759 /* This is the "router alert" option */
mbed_official 0:51ac1d130fd4 760 u16_t ra[2];
mbed_official 0:51ac1d130fd4 761 ra[0] = PP_HTONS(ROUTER_ALERT);
mbed_official 0:51ac1d130fd4 762 ra[1] = 0x0000; /* Router shall examine packet */
mbed_official 0:51ac1d130fd4 763 IGMP_STATS_INC(igmp.xmit);
mbed_official 0:51ac1d130fd4 764 return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
mbed_official 0:51ac1d130fd4 765 }
mbed_official 0:51ac1d130fd4 766
mbed_official 0:51ac1d130fd4 767 /**
mbed_official 0:51ac1d130fd4 768 * Send an igmp packet to a specific group.
mbed_official 0:51ac1d130fd4 769 *
mbed_official 0:51ac1d130fd4 770 * @param group the group to which to send the packet
mbed_official 0:51ac1d130fd4 771 * @param type the type of igmp packet to send
mbed_official 0:51ac1d130fd4 772 */
mbed_official 0:51ac1d130fd4 773 static void
mbed_official 0:51ac1d130fd4 774 igmp_send(struct igmp_group *group, u8_t type)
mbed_official 0:51ac1d130fd4 775 {
mbed_official 0:51ac1d130fd4 776 struct pbuf* p = NULL;
mbed_official 0:51ac1d130fd4 777 struct igmp_msg* igmp = NULL;
mbed_official 0:51ac1d130fd4 778 ip_addr_t src = *IP_ADDR_ANY;
mbed_official 0:51ac1d130fd4 779 ip_addr_t* dest = NULL;
mbed_official 0:51ac1d130fd4 780
mbed_official 0:51ac1d130fd4 781 /* IP header + "router alert" option + IGMP header */
mbed_official 0:51ac1d130fd4 782 p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
mbed_official 0:51ac1d130fd4 783
mbed_official 0:51ac1d130fd4 784 if (p) {
mbed_official 0:51ac1d130fd4 785 igmp = (struct igmp_msg *)p->payload;
mbed_official 0:51ac1d130fd4 786 LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
mbed_official 0:51ac1d130fd4 787 (p->len >= sizeof(struct igmp_msg)));
mbed_official 0:51ac1d130fd4 788 ip_addr_copy(src, group->netif->ip_addr);
mbed_official 0:51ac1d130fd4 789
mbed_official 0:51ac1d130fd4 790 if (type == IGMP_V2_MEMB_REPORT) {
mbed_official 0:51ac1d130fd4 791 dest = &(group->group_address);
mbed_official 0:51ac1d130fd4 792 ip_addr_copy(igmp->igmp_group_address, group->group_address);
mbed_official 0:51ac1d130fd4 793 group->last_reporter_flag = 1; /* Remember we were the last to report */
mbed_official 0:51ac1d130fd4 794 } else {
mbed_official 0:51ac1d130fd4 795 if (type == IGMP_LEAVE_GROUP) {
mbed_official 0:51ac1d130fd4 796 dest = &allrouters;
mbed_official 0:51ac1d130fd4 797 ip_addr_copy(igmp->igmp_group_address, group->group_address);
mbed_official 0:51ac1d130fd4 798 }
mbed_official 0:51ac1d130fd4 799 }
mbed_official 0:51ac1d130fd4 800
mbed_official 0:51ac1d130fd4 801 if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
mbed_official 0:51ac1d130fd4 802 igmp->igmp_msgtype = type;
mbed_official 0:51ac1d130fd4 803 igmp->igmp_maxresp = 0;
mbed_official 0:51ac1d130fd4 804 igmp->igmp_checksum = 0;
mbed_official 0:51ac1d130fd4 805 igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
mbed_official 0:51ac1d130fd4 806
mbed_official 0:51ac1d130fd4 807 igmp_ip_output_if(p, &src, dest, group->netif);
mbed_official 0:51ac1d130fd4 808 }
mbed_official 0:51ac1d130fd4 809
mbed_official 0:51ac1d130fd4 810 pbuf_free(p);
mbed_official 0:51ac1d130fd4 811 } else {
mbed_official 0:51ac1d130fd4 812 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
mbed_official 0:51ac1d130fd4 813 IGMP_STATS_INC(igmp.memerr);
mbed_official 0:51ac1d130fd4 814 }
mbed_official 0:51ac1d130fd4 815 }
mbed_official 0:51ac1d130fd4 816
mbed_official 0:51ac1d130fd4 817 #endif /* LWIP_IGMP */