Nino Der Kinderen / Mbed 2 deprecated InetTest

Embedded C project:18/12/2014

Dependencies:   DS1307 TextLCD mbed

NetServices/lwip/core/ipv4/igmp.c@0:8d87bc453349, 2014-12-18 (annotated)

Committer:
ninoderkinderen
Date:
Thu Dec 18 09:35:49 2014 +0000
Revision:
0:8d87bc453349
Programma embedded C

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ninoderkinderen 0:8d87bc453349 1 #pragma diag_remark 177
ninoderkinderen 0:8d87bc453349 2 /**
ninoderkinderen 0:8d87bc453349 3 * @file
ninoderkinderen 0:8d87bc453349 4 * IGMP - Internet Group Management Protocol
ninoderkinderen 0:8d87bc453349 5 *
ninoderkinderen 0:8d87bc453349 6 */
ninoderkinderen 0:8d87bc453349 7
ninoderkinderen 0:8d87bc453349 8 /*
ninoderkinderen 0:8d87bc453349 9 * Copyright (c) 2002 CITEL Technologies Ltd.
ninoderkinderen 0:8d87bc453349 10 * All rights reserved.
ninoderkinderen 0:8d87bc453349 11 *
ninoderkinderen 0:8d87bc453349 12 * Redistribution and use in source and binary forms, with or without
ninoderkinderen 0:8d87bc453349 13 * modification, are permitted provided that the following conditions
ninoderkinderen 0:8d87bc453349 14 * are met:
ninoderkinderen 0:8d87bc453349 15 * 1. Redistributions of source code must retain the above copyright
ninoderkinderen 0:8d87bc453349 16 * notice, this list of conditions and the following disclaimer.
ninoderkinderen 0:8d87bc453349 17 * 2. Redistributions in binary form must reproduce the above copyright
ninoderkinderen 0:8d87bc453349 18 * notice, this list of conditions and the following disclaimer in the
ninoderkinderen 0:8d87bc453349 19 * documentation and/or other materials provided with the distribution.
ninoderkinderen 0:8d87bc453349 20 * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
ninoderkinderen 0:8d87bc453349 21 * may be used to endorse or promote products derived from this software
ninoderkinderen 0:8d87bc453349 22 * without specific prior written permission.
ninoderkinderen 0:8d87bc453349 23 *
ninoderkinderen 0:8d87bc453349 24 * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
ninoderkinderen 0:8d87bc453349 25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ninoderkinderen 0:8d87bc453349 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ninoderkinderen 0:8d87bc453349 27 * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
ninoderkinderen 0:8d87bc453349 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ninoderkinderen 0:8d87bc453349 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ninoderkinderen 0:8d87bc453349 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ninoderkinderen 0:8d87bc453349 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ninoderkinderen 0:8d87bc453349 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ninoderkinderen 0:8d87bc453349 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ninoderkinderen 0:8d87bc453349 34 * SUCH DAMAGE.
ninoderkinderen 0:8d87bc453349 35 *
ninoderkinderen 0:8d87bc453349 36 * This file is a contribution to the lwIP TCP/IP stack.
ninoderkinderen 0:8d87bc453349 37 * The Swedish Institute of Computer Science and Adam Dunkels
ninoderkinderen 0:8d87bc453349 38 * are specifically granted permission to redistribute this
ninoderkinderen 0:8d87bc453349 39 * source code.
ninoderkinderen 0:8d87bc453349 40 */
ninoderkinderen 0:8d87bc453349 41
ninoderkinderen 0:8d87bc453349 42 /*-------------------------------------------------------------
ninoderkinderen 0:8d87bc453349 43 Note 1)
ninoderkinderen 0:8d87bc453349 44 Although the rfc requires V1 AND V2 capability
ninoderkinderen 0:8d87bc453349 45 we will only support v2 since now V1 is very old (August 1989)
ninoderkinderen 0:8d87bc453349 46 V1 can be added if required
ninoderkinderen 0:8d87bc453349 47
ninoderkinderen 0:8d87bc453349 48 a debug print and statistic have been implemented to
ninoderkinderen 0:8d87bc453349 49 show this up.
ninoderkinderen 0:8d87bc453349 50 -------------------------------------------------------------
ninoderkinderen 0:8d87bc453349 51 -------------------------------------------------------------
ninoderkinderen 0:8d87bc453349 52 Note 2)
ninoderkinderen 0:8d87bc453349 53 A query for a specific group address (as opposed to ALLHOSTS)
ninoderkinderen 0:8d87bc453349 54 has now been implemented as I am unsure if it is required
ninoderkinderen 0:8d87bc453349 55
ninoderkinderen 0:8d87bc453349 56 a debug print and statistic have been implemented to
ninoderkinderen 0:8d87bc453349 57 show this up.
ninoderkinderen 0:8d87bc453349 58 -------------------------------------------------------------
ninoderkinderen 0:8d87bc453349 59 -------------------------------------------------------------
ninoderkinderen 0:8d87bc453349 60 Note 3)
ninoderkinderen 0:8d87bc453349 61 The router alert rfc 2113 is implemented in outgoing packets
ninoderkinderen 0:8d87bc453349 62 but not checked rigorously incoming
ninoderkinderen 0:8d87bc453349 63 -------------------------------------------------------------
ninoderkinderen 0:8d87bc453349 64 Steve Reynolds
ninoderkinderen 0:8d87bc453349 65 ------------------------------------------------------------*/
ninoderkinderen 0:8d87bc453349 66
ninoderkinderen 0:8d87bc453349 67 /*-----------------------------------------------------------------------------
ninoderkinderen 0:8d87bc453349 68 * RFC 988 - Host extensions for IP multicasting - V0
ninoderkinderen 0:8d87bc453349 69 * RFC 1054 - Host extensions for IP multicasting -
ninoderkinderen 0:8d87bc453349 70 * RFC 1112 - Host extensions for IP multicasting - V1
ninoderkinderen 0:8d87bc453349 71 * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
ninoderkinderen 0:8d87bc453349 72 * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
ninoderkinderen 0:8d87bc453349 73 * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
ninoderkinderen 0:8d87bc453349 74 * RFC 2113 - IP Router Alert Option -
ninoderkinderen 0:8d87bc453349 75 *----------------------------------------------------------------------------*/
ninoderkinderen 0:8d87bc453349 76
ninoderkinderen 0:8d87bc453349 77 /*-----------------------------------------------------------------------------
ninoderkinderen 0:8d87bc453349 78 * Includes
ninoderkinderen 0:8d87bc453349 79 *----------------------------------------------------------------------------*/
ninoderkinderen 0:8d87bc453349 80
ninoderkinderen 0:8d87bc453349 81 #include "lwip/opt.h"
ninoderkinderen 0:8d87bc453349 82
ninoderkinderen 0:8d87bc453349 83 #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
ninoderkinderen 0:8d87bc453349 84
ninoderkinderen 0:8d87bc453349 85 #include "lwip/igmp.h"
ninoderkinderen 0:8d87bc453349 86 #include "lwip/debug.h"
ninoderkinderen 0:8d87bc453349 87 #include "lwip/def.h"
ninoderkinderen 0:8d87bc453349 88 #include "lwip/mem.h"
ninoderkinderen 0:8d87bc453349 89 #include "lwip/ip.h"
ninoderkinderen 0:8d87bc453349 90 #include "lwip/inet_chksum.h"
ninoderkinderen 0:8d87bc453349 91 #include "lwip/netif.h"
ninoderkinderen 0:8d87bc453349 92 #include "lwip/icmp.h"
ninoderkinderen 0:8d87bc453349 93 #include "lwip/udp.h"
ninoderkinderen 0:8d87bc453349 94 #include "lwip/tcp.h"
ninoderkinderen 0:8d87bc453349 95 #include "lwip/stats.h"
ninoderkinderen 0:8d87bc453349 96
ninoderkinderen 0:8d87bc453349 97 #include "string.h"
ninoderkinderen 0:8d87bc453349 98
ninoderkinderen 0:8d87bc453349 99 /*
ninoderkinderen 0:8d87bc453349 100 * IGMP constants
ninoderkinderen 0:8d87bc453349 101 */
ninoderkinderen 0:8d87bc453349 102 #define IGMP_TTL 1
ninoderkinderen 0:8d87bc453349 103 #define IGMP_MINLEN 8
ninoderkinderen 0:8d87bc453349 104 #define ROUTER_ALERT 0x9404
ninoderkinderen 0:8d87bc453349 105 #define ROUTER_ALERTLEN 4
ninoderkinderen 0:8d87bc453349 106
ninoderkinderen 0:8d87bc453349 107 /*
ninoderkinderen 0:8d87bc453349 108 * IGMP message types, including version number.
ninoderkinderen 0:8d87bc453349 109 */
ninoderkinderen 0:8d87bc453349 110 #define IGMP_MEMB_QUERY 0x11 /* Membership query */
ninoderkinderen 0:8d87bc453349 111 #define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
ninoderkinderen 0:8d87bc453349 112 #define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
ninoderkinderen 0:8d87bc453349 113 #define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
ninoderkinderen 0:8d87bc453349 114
ninoderkinderen 0:8d87bc453349 115 /* Group membership states */
ninoderkinderen 0:8d87bc453349 116 #define IGMP_GROUP_NON_MEMBER 0
ninoderkinderen 0:8d87bc453349 117 #define IGMP_GROUP_DELAYING_MEMBER 1
ninoderkinderen 0:8d87bc453349 118 #define IGMP_GROUP_IDLE_MEMBER 2
ninoderkinderen 0:8d87bc453349 119
ninoderkinderen 0:8d87bc453349 120 /**
ninoderkinderen 0:8d87bc453349 121 * IGMP packet format.
ninoderkinderen 0:8d87bc453349 122 */
ninoderkinderen 0:8d87bc453349 123 #ifdef PACK_STRUCT_USE_INCLUDES
ninoderkinderen 0:8d87bc453349 124 # include "arch/bpstruct.h"
ninoderkinderen 0:8d87bc453349 125 #endif
ninoderkinderen 0:8d87bc453349 126 PACK_STRUCT_BEGIN
ninoderkinderen 0:8d87bc453349 127 struct igmp_msg {
ninoderkinderen 0:8d87bc453349 128 PACK_STRUCT_FIELD(u8_t igmp_msgtype);
ninoderkinderen 0:8d87bc453349 129 PACK_STRUCT_FIELD(u8_t igmp_maxresp);
ninoderkinderen 0:8d87bc453349 130 PACK_STRUCT_FIELD(u16_t igmp_checksum);
ninoderkinderen 0:8d87bc453349 131 PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
ninoderkinderen 0:8d87bc453349 132 } PACK_STRUCT_STRUCT;
ninoderkinderen 0:8d87bc453349 133 PACK_STRUCT_END
ninoderkinderen 0:8d87bc453349 134 #ifdef PACK_STRUCT_USE_INCLUDES
ninoderkinderen 0:8d87bc453349 135 # include "arch/epstruct.h"
ninoderkinderen 0:8d87bc453349 136 #endif
ninoderkinderen 0:8d87bc453349 137
ninoderkinderen 0:8d87bc453349 138
ninoderkinderen 0:8d87bc453349 139 static struct igmp_group *igmp_lookup_group(struct netif *ifp, ip_addr_t *addr);
ninoderkinderen 0:8d87bc453349 140 static err_t igmp_remove_group(struct igmp_group *group);
ninoderkinderen 0:8d87bc453349 141 static void igmp_timeout( struct igmp_group *group);
ninoderkinderen 0:8d87bc453349 142 static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
ninoderkinderen 0:8d87bc453349 143 static void igmp_stop_timer(struct igmp_group *group);
ninoderkinderen 0:8d87bc453349 144 static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
ninoderkinderen 0:8d87bc453349 145 static err_t igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif);
ninoderkinderen 0:8d87bc453349 146 static void igmp_send(struct igmp_group *group, u8_t type);
ninoderkinderen 0:8d87bc453349 147
ninoderkinderen 0:8d87bc453349 148
ninoderkinderen 0:8d87bc453349 149 static struct igmp_group* igmp_group_list;
ninoderkinderen 0:8d87bc453349 150 static ip_addr_t allsystems;
ninoderkinderen 0:8d87bc453349 151 static ip_addr_t allrouters;
ninoderkinderen 0:8d87bc453349 152
ninoderkinderen 0:8d87bc453349 153
ninoderkinderen 0:8d87bc453349 154 /**
ninoderkinderen 0:8d87bc453349 155 * Initialize the IGMP module
ninoderkinderen 0:8d87bc453349 156 */
ninoderkinderen 0:8d87bc453349 157 void
ninoderkinderen 0:8d87bc453349 158 igmp_init(void)
ninoderkinderen 0:8d87bc453349 159 {
ninoderkinderen 0:8d87bc453349 160 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
ninoderkinderen 0:8d87bc453349 161
ninoderkinderen 0:8d87bc453349 162 IP4_ADDR(&allsystems, 224, 0, 0, 1);
ninoderkinderen 0:8d87bc453349 163 IP4_ADDR(&allrouters, 224, 0, 0, 2);
ninoderkinderen 0:8d87bc453349 164 }
ninoderkinderen 0:8d87bc453349 165
ninoderkinderen 0:8d87bc453349 166 #ifdef LWIP_DEBUG
ninoderkinderen 0:8d87bc453349 167 /**
ninoderkinderen 0:8d87bc453349 168 * Dump global IGMP groups list
ninoderkinderen 0:8d87bc453349 169 */
ninoderkinderen 0:8d87bc453349 170 void
ninoderkinderen 0:8d87bc453349 171 igmp_dump_group_list()
ninoderkinderen 0:8d87bc453349 172 {
ninoderkinderen 0:8d87bc453349 173 struct igmp_group *group = igmp_group_list;
ninoderkinderen 0:8d87bc453349 174
ninoderkinderen 0:8d87bc453349 175 while (group != NULL) {
ninoderkinderen 0:8d87bc453349 176 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
ninoderkinderen 0:8d87bc453349 177 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
ninoderkinderen 0:8d87bc453349 178 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
ninoderkinderen 0:8d87bc453349 179 group = group->next;
ninoderkinderen 0:8d87bc453349 180 }
ninoderkinderen 0:8d87bc453349 181 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
ninoderkinderen 0:8d87bc453349 182 }
ninoderkinderen 0:8d87bc453349 183 #else
ninoderkinderen 0:8d87bc453349 184 #define igmp_dump_group_list()
ninoderkinderen 0:8d87bc453349 185 #endif /* LWIP_DEBUG */
ninoderkinderen 0:8d87bc453349 186
ninoderkinderen 0:8d87bc453349 187 /**
ninoderkinderen 0:8d87bc453349 188 * Start IGMP processing on interface
ninoderkinderen 0:8d87bc453349 189 *
ninoderkinderen 0:8d87bc453349 190 * @param netif network interface on which start IGMP processing
ninoderkinderen 0:8d87bc453349 191 */
ninoderkinderen 0:8d87bc453349 192 err_t
ninoderkinderen 0:8d87bc453349 193 igmp_start(struct netif *netif)
ninoderkinderen 0:8d87bc453349 194 {
ninoderkinderen 0:8d87bc453349 195 struct igmp_group* group;
ninoderkinderen 0:8d87bc453349 196
ninoderkinderen 0:8d87bc453349 197 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
ninoderkinderen 0:8d87bc453349 198
ninoderkinderen 0:8d87bc453349 199 group = igmp_lookup_group(netif, &allsystems);
ninoderkinderen 0:8d87bc453349 200
ninoderkinderen 0:8d87bc453349 201 if (group != NULL) {
ninoderkinderen 0:8d87bc453349 202 group->group_state = IGMP_GROUP_IDLE_MEMBER;
ninoderkinderen 0:8d87bc453349 203 group->use++;
ninoderkinderen 0:8d87bc453349 204
ninoderkinderen 0:8d87bc453349 205 /* Allow the igmp messages at the MAC level */
ninoderkinderen 0:8d87bc453349 206 if (netif->igmp_mac_filter != NULL) {
ninoderkinderen 0:8d87bc453349 207 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
ninoderkinderen 0:8d87bc453349 208 ip_addr_debug_print(IGMP_DEBUG, &allsystems);
ninoderkinderen 0:8d87bc453349 209 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
ninoderkinderen 0:8d87bc453349 210 netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
ninoderkinderen 0:8d87bc453349 211 }
ninoderkinderen 0:8d87bc453349 212
ninoderkinderen 0:8d87bc453349 213 return ERR_OK;
ninoderkinderen 0:8d87bc453349 214 }
ninoderkinderen 0:8d87bc453349 215
ninoderkinderen 0:8d87bc453349 216 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 217 }
ninoderkinderen 0:8d87bc453349 218
ninoderkinderen 0:8d87bc453349 219 /**
ninoderkinderen 0:8d87bc453349 220 * Stop IGMP processing on interface
ninoderkinderen 0:8d87bc453349 221 *
ninoderkinderen 0:8d87bc453349 222 * @param netif network interface on which stop IGMP processing
ninoderkinderen 0:8d87bc453349 223 */
ninoderkinderen 0:8d87bc453349 224 err_t
ninoderkinderen 0:8d87bc453349 225 igmp_stop(struct netif *netif)
ninoderkinderen 0:8d87bc453349 226 {
ninoderkinderen 0:8d87bc453349 227 struct igmp_group *group = igmp_group_list;
ninoderkinderen 0:8d87bc453349 228 struct igmp_group *prev = NULL;
ninoderkinderen 0:8d87bc453349 229 struct igmp_group *next;
ninoderkinderen 0:8d87bc453349 230
ninoderkinderen 0:8d87bc453349 231 /* look for groups joined on this interface further down the list */
ninoderkinderen 0:8d87bc453349 232 while (group != NULL) {
ninoderkinderen 0:8d87bc453349 233 next = group->next;
ninoderkinderen 0:8d87bc453349 234 /* is it a group joined on this interface? */
ninoderkinderen 0:8d87bc453349 235 if (group->netif == netif) {
ninoderkinderen 0:8d87bc453349 236 /* is it the first group of the list? */
ninoderkinderen 0:8d87bc453349 237 if (group == igmp_group_list) {
ninoderkinderen 0:8d87bc453349 238 igmp_group_list = next;
ninoderkinderen 0:8d87bc453349 239 }
ninoderkinderen 0:8d87bc453349 240 /* is there a "previous" group defined? */
ninoderkinderen 0:8d87bc453349 241 if (prev != NULL) {
ninoderkinderen 0:8d87bc453349 242 prev->next = next;
ninoderkinderen 0:8d87bc453349 243 }
ninoderkinderen 0:8d87bc453349 244 /* disable the group at the MAC level */
ninoderkinderen 0:8d87bc453349 245 if (netif->igmp_mac_filter != NULL) {
ninoderkinderen 0:8d87bc453349 246 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
ninoderkinderen 0:8d87bc453349 247 ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
ninoderkinderen 0:8d87bc453349 248 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
ninoderkinderen 0:8d87bc453349 249 netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
ninoderkinderen 0:8d87bc453349 250 }
ninoderkinderen 0:8d87bc453349 251 /* free group */
ninoderkinderen 0:8d87bc453349 252 memp_free(MEMP_IGMP_GROUP, group);
ninoderkinderen 0:8d87bc453349 253 } else {
ninoderkinderen 0:8d87bc453349 254 /* change the "previous" */
ninoderkinderen 0:8d87bc453349 255 prev = group;
ninoderkinderen 0:8d87bc453349 256 }
ninoderkinderen 0:8d87bc453349 257 /* move to "next" */
ninoderkinderen 0:8d87bc453349 258 group = next;
ninoderkinderen 0:8d87bc453349 259 }
ninoderkinderen 0:8d87bc453349 260 return ERR_OK;
ninoderkinderen 0:8d87bc453349 261 }
ninoderkinderen 0:8d87bc453349 262
ninoderkinderen 0:8d87bc453349 263 /**
ninoderkinderen 0:8d87bc453349 264 * Report IGMP memberships for this interface
ninoderkinderen 0:8d87bc453349 265 *
ninoderkinderen 0:8d87bc453349 266 * @param netif network interface on which report IGMP memberships
ninoderkinderen 0:8d87bc453349 267 */
ninoderkinderen 0:8d87bc453349 268 void
ninoderkinderen 0:8d87bc453349 269 igmp_report_groups(struct netif *netif)
ninoderkinderen 0:8d87bc453349 270 {
ninoderkinderen 0:8d87bc453349 271 struct igmp_group *group = igmp_group_list;
ninoderkinderen 0:8d87bc453349 272
ninoderkinderen 0:8d87bc453349 273 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
ninoderkinderen 0:8d87bc453349 274
ninoderkinderen 0:8d87bc453349 275 while (group != NULL) {
ninoderkinderen 0:8d87bc453349 276 if (group->netif == netif) {
ninoderkinderen 0:8d87bc453349 277 igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
ninoderkinderen 0:8d87bc453349 278 }
ninoderkinderen 0:8d87bc453349 279 group = group->next;
ninoderkinderen 0:8d87bc453349 280 }
ninoderkinderen 0:8d87bc453349 281 }
ninoderkinderen 0:8d87bc453349 282
ninoderkinderen 0:8d87bc453349 283 /**
ninoderkinderen 0:8d87bc453349 284 * Search for a group in the global igmp_group_list
ninoderkinderen 0:8d87bc453349 285 *
ninoderkinderen 0:8d87bc453349 286 * @param ifp the network interface for which to look
ninoderkinderen 0:8d87bc453349 287 * @param addr the group ip address to search for
ninoderkinderen 0:8d87bc453349 288 * @return a struct igmp_group* if the group has been found,
ninoderkinderen 0:8d87bc453349 289 * NULL if the group wasn't found.
ninoderkinderen 0:8d87bc453349 290 */
ninoderkinderen 0:8d87bc453349 291 struct igmp_group *
ninoderkinderen 0:8d87bc453349 292 igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr)
ninoderkinderen 0:8d87bc453349 293 {
ninoderkinderen 0:8d87bc453349 294 struct igmp_group *group = igmp_group_list;
ninoderkinderen 0:8d87bc453349 295
ninoderkinderen 0:8d87bc453349 296 while (group != NULL) {
ninoderkinderen 0:8d87bc453349 297 if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
ninoderkinderen 0:8d87bc453349 298 return group;
ninoderkinderen 0:8d87bc453349 299 }
ninoderkinderen 0:8d87bc453349 300 group = group->next;
ninoderkinderen 0:8d87bc453349 301 }
ninoderkinderen 0:8d87bc453349 302
ninoderkinderen 0:8d87bc453349 303 /* to be clearer, we return NULL here instead of
ninoderkinderen 0:8d87bc453349 304 * 'group' (which is also NULL at this point).
ninoderkinderen 0:8d87bc453349 305 */
ninoderkinderen 0:8d87bc453349 306 return NULL;
ninoderkinderen 0:8d87bc453349 307 }
ninoderkinderen 0:8d87bc453349 308
ninoderkinderen 0:8d87bc453349 309 /**
ninoderkinderen 0:8d87bc453349 310 * Search for a specific igmp group and create a new one if not found-
ninoderkinderen 0:8d87bc453349 311 *
ninoderkinderen 0:8d87bc453349 312 * @param ifp the network interface for which to look
ninoderkinderen 0:8d87bc453349 313 * @param addr the group ip address to search
ninoderkinderen 0:8d87bc453349 314 * @return a struct igmp_group*,
ninoderkinderen 0:8d87bc453349 315 * NULL on memory error.
ninoderkinderen 0:8d87bc453349 316 */
ninoderkinderen 0:8d87bc453349 317 struct igmp_group *
ninoderkinderen 0:8d87bc453349 318 igmp_lookup_group(struct netif *ifp, ip_addr_t *addr)
ninoderkinderen 0:8d87bc453349 319 {
ninoderkinderen 0:8d87bc453349 320 struct igmp_group *group = igmp_group_list;
ninoderkinderen 0:8d87bc453349 321
ninoderkinderen 0:8d87bc453349 322 /* Search if the group already exists */
ninoderkinderen 0:8d87bc453349 323 group = igmp_lookfor_group(ifp, addr);
ninoderkinderen 0:8d87bc453349 324 if (group != NULL) {
ninoderkinderen 0:8d87bc453349 325 /* Group already exists. */
ninoderkinderen 0:8d87bc453349 326 return group;
ninoderkinderen 0:8d87bc453349 327 }
ninoderkinderen 0:8d87bc453349 328
ninoderkinderen 0:8d87bc453349 329 /* Group doesn't exist yet, create a new one */
ninoderkinderen 0:8d87bc453349 330 group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
ninoderkinderen 0:8d87bc453349 331 if (group != NULL) {
ninoderkinderen 0:8d87bc453349 332 group->netif = ifp;
ninoderkinderen 0:8d87bc453349 333 ip_addr_set(&(group->group_address), addr);
ninoderkinderen 0:8d87bc453349 334 group->timer = 0; /* Not running */
ninoderkinderen 0:8d87bc453349 335 group->group_state = IGMP_GROUP_NON_MEMBER;
ninoderkinderen 0:8d87bc453349 336 group->last_reporter_flag = 0;
ninoderkinderen 0:8d87bc453349 337 group->use = 0;
ninoderkinderen 0:8d87bc453349 338 group->next = igmp_group_list;
ninoderkinderen 0:8d87bc453349 339
ninoderkinderen 0:8d87bc453349 340 igmp_group_list = group;
ninoderkinderen 0:8d87bc453349 341 }
ninoderkinderen 0:8d87bc453349 342
ninoderkinderen 0:8d87bc453349 343 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
ninoderkinderen 0:8d87bc453349 344 ip_addr_debug_print(IGMP_DEBUG, addr);
ninoderkinderen 0:8d87bc453349 345 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
ninoderkinderen 0:8d87bc453349 346
ninoderkinderen 0:8d87bc453349 347 return group;
ninoderkinderen 0:8d87bc453349 348 }
ninoderkinderen 0:8d87bc453349 349
ninoderkinderen 0:8d87bc453349 350 /**
ninoderkinderen 0:8d87bc453349 351 * Remove a group in the global igmp_group_list
ninoderkinderen 0:8d87bc453349 352 *
ninoderkinderen 0:8d87bc453349 353 * @param group the group to remove from the global igmp_group_list
ninoderkinderen 0:8d87bc453349 354 * @return ERR_OK if group was removed from the list, an err_t otherwise
ninoderkinderen 0:8d87bc453349 355 */
ninoderkinderen 0:8d87bc453349 356 static err_t
ninoderkinderen 0:8d87bc453349 357 igmp_remove_group(struct igmp_group *group)
ninoderkinderen 0:8d87bc453349 358 {
ninoderkinderen 0:8d87bc453349 359 err_t err = ERR_OK;
ninoderkinderen 0:8d87bc453349 360
ninoderkinderen 0:8d87bc453349 361 /* Is it the first group? */
ninoderkinderen 0:8d87bc453349 362 if (igmp_group_list == group) {
ninoderkinderen 0:8d87bc453349 363 igmp_group_list = group->next;
ninoderkinderen 0:8d87bc453349 364 } else {
ninoderkinderen 0:8d87bc453349 365 /* look for group further down the list */
ninoderkinderen 0:8d87bc453349 366 struct igmp_group *tmpGroup;
ninoderkinderen 0:8d87bc453349 367 for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
ninoderkinderen 0:8d87bc453349 368 if (tmpGroup->next == group) {
ninoderkinderen 0:8d87bc453349 369 tmpGroup->next = group->next;
ninoderkinderen 0:8d87bc453349 370 break;
ninoderkinderen 0:8d87bc453349 371 }
ninoderkinderen 0:8d87bc453349 372 }
ninoderkinderen 0:8d87bc453349 373 /* Group not found in the global igmp_group_list */
ninoderkinderen 0:8d87bc453349 374 if (tmpGroup == NULL)
ninoderkinderen 0:8d87bc453349 375 err = ERR_ARG;
ninoderkinderen 0:8d87bc453349 376 }
ninoderkinderen 0:8d87bc453349 377 /* free group */
ninoderkinderen 0:8d87bc453349 378 memp_free(MEMP_IGMP_GROUP, group);
ninoderkinderen 0:8d87bc453349 379
ninoderkinderen 0:8d87bc453349 380 return err;
ninoderkinderen 0:8d87bc453349 381 }
ninoderkinderen 0:8d87bc453349 382
ninoderkinderen 0:8d87bc453349 383 /**
ninoderkinderen 0:8d87bc453349 384 * Called from ip_input() if a new IGMP packet is received.
ninoderkinderen 0:8d87bc453349 385 *
ninoderkinderen 0:8d87bc453349 386 * @param p received igmp packet, p->payload pointing to the ip header
ninoderkinderen 0:8d87bc453349 387 * @param inp network interface on which the packet was received
ninoderkinderen 0:8d87bc453349 388 * @param dest destination ip address of the igmp packet
ninoderkinderen 0:8d87bc453349 389 */
ninoderkinderen 0:8d87bc453349 390 void
ninoderkinderen 0:8d87bc453349 391 igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest)
ninoderkinderen 0:8d87bc453349 392 {
ninoderkinderen 0:8d87bc453349 393 struct ip_hdr * iphdr;
ninoderkinderen 0:8d87bc453349 394 struct igmp_msg* igmp;
ninoderkinderen 0:8d87bc453349 395 struct igmp_group* group;
ninoderkinderen 0:8d87bc453349 396 struct igmp_group* groupref;
ninoderkinderen 0:8d87bc453349 397
ninoderkinderen 0:8d87bc453349 398 IGMP_STATS_INC(igmp.recv);
ninoderkinderen 0:8d87bc453349 399
ninoderkinderen 0:8d87bc453349 400 /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
ninoderkinderen 0:8d87bc453349 401 iphdr = (struct ip_hdr *)p->payload;
ninoderkinderen 0:8d87bc453349 402 if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
ninoderkinderen 0:8d87bc453349 403 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 404 IGMP_STATS_INC(igmp.lenerr);
ninoderkinderen 0:8d87bc453349 405 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
ninoderkinderen 0:8d87bc453349 406 return;
ninoderkinderen 0:8d87bc453349 407 }
ninoderkinderen 0:8d87bc453349 408
ninoderkinderen 0:8d87bc453349 409 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
ninoderkinderen 0:8d87bc453349 410 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
ninoderkinderen 0:8d87bc453349 411 LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
ninoderkinderen 0:8d87bc453349 412 ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
ninoderkinderen 0:8d87bc453349 413 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
ninoderkinderen 0:8d87bc453349 414
ninoderkinderen 0:8d87bc453349 415 /* Now calculate and check the checksum */
ninoderkinderen 0:8d87bc453349 416 igmp = (struct igmp_msg *)p->payload;
ninoderkinderen 0:8d87bc453349 417 if (inet_chksum(igmp, p->len)) {
ninoderkinderen 0:8d87bc453349 418 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 419 IGMP_STATS_INC(igmp.chkerr);
ninoderkinderen 0:8d87bc453349 420 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
ninoderkinderen 0:8d87bc453349 421 return;
ninoderkinderen 0:8d87bc453349 422 }
ninoderkinderen 0:8d87bc453349 423
ninoderkinderen 0:8d87bc453349 424 /* Packet is ok so find an existing group */
ninoderkinderen 0:8d87bc453349 425 group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
ninoderkinderen 0:8d87bc453349 426
ninoderkinderen 0:8d87bc453349 427 /* If group can be found or create... */
ninoderkinderen 0:8d87bc453349 428 if (!group) {
ninoderkinderen 0:8d87bc453349 429 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 430 IGMP_STATS_INC(igmp.drop);
ninoderkinderen 0:8d87bc453349 431 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
ninoderkinderen 0:8d87bc453349 432 return;
ninoderkinderen 0:8d87bc453349 433 }
ninoderkinderen 0:8d87bc453349 434
ninoderkinderen 0:8d87bc453349 435 /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
ninoderkinderen 0:8d87bc453349 436 switch (igmp->igmp_msgtype) {
ninoderkinderen 0:8d87bc453349 437 case IGMP_MEMB_QUERY: {
ninoderkinderen 0:8d87bc453349 438 /* IGMP_MEMB_QUERY to the "all systems" address ? */
ninoderkinderen 0:8d87bc453349 439 if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
ninoderkinderen 0:8d87bc453349 440 /* THIS IS THE GENERAL QUERY */
ninoderkinderen 0:8d87bc453349 441 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)));
ninoderkinderen 0:8d87bc453349 442
ninoderkinderen 0:8d87bc453349 443 if (igmp->igmp_maxresp == 0) {
ninoderkinderen 0:8d87bc453349 444 IGMP_STATS_INC(igmp.rx_v1);
ninoderkinderen 0:8d87bc453349 445 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
ninoderkinderen 0:8d87bc453349 446 igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
ninoderkinderen 0:8d87bc453349 447 } else {
ninoderkinderen 0:8d87bc453349 448 IGMP_STATS_INC(igmp.rx_general);
ninoderkinderen 0:8d87bc453349 449 }
ninoderkinderen 0:8d87bc453349 450
ninoderkinderen 0:8d87bc453349 451 groupref = igmp_group_list;
ninoderkinderen 0:8d87bc453349 452 while (groupref) {
ninoderkinderen 0:8d87bc453349 453 /* Do not send messages on the all systems group address! */
ninoderkinderen 0:8d87bc453349 454 if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
ninoderkinderen 0:8d87bc453349 455 igmp_delaying_member(groupref, igmp->igmp_maxresp);
ninoderkinderen 0:8d87bc453349 456 }
ninoderkinderen 0:8d87bc453349 457 groupref = groupref->next;
ninoderkinderen 0:8d87bc453349 458 }
ninoderkinderen 0:8d87bc453349 459 } else {
ninoderkinderen 0:8d87bc453349 460 /* IGMP_MEMB_QUERY to a specific group ? */
ninoderkinderen 0:8d87bc453349 461 if (!ip_addr_isany(&igmp->igmp_group_address)) {
ninoderkinderen 0:8d87bc453349 462 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
ninoderkinderen 0:8d87bc453349 463 ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
ninoderkinderen 0:8d87bc453349 464 if (ip_addr_cmp(dest, &allsystems)) {
ninoderkinderen 0:8d87bc453349 465 ip_addr_t groupaddr;
ninoderkinderen 0:8d87bc453349 466 LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
ninoderkinderen 0:8d87bc453349 467 /* we first need to re-look for the group since we used dest last time */
ninoderkinderen 0:8d87bc453349 468 ip_addr_copy(groupaddr, igmp->igmp_group_address);
ninoderkinderen 0:8d87bc453349 469 group = igmp_lookfor_group(inp, &groupaddr);
ninoderkinderen 0:8d87bc453349 470 } else {
ninoderkinderen 0:8d87bc453349 471 LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
ninoderkinderen 0:8d87bc453349 472 }
ninoderkinderen 0:8d87bc453349 473
ninoderkinderen 0:8d87bc453349 474 if (group != NULL) {
ninoderkinderen 0:8d87bc453349 475 IGMP_STATS_INC(igmp.rx_group);
ninoderkinderen 0:8d87bc453349 476 igmp_delaying_member(group, igmp->igmp_maxresp);
ninoderkinderen 0:8d87bc453349 477 } else {
ninoderkinderen 0:8d87bc453349 478 IGMP_STATS_INC(igmp.drop);
ninoderkinderen 0:8d87bc453349 479 }
ninoderkinderen 0:8d87bc453349 480 } else {
ninoderkinderen 0:8d87bc453349 481 IGMP_STATS_INC(igmp.proterr);
ninoderkinderen 0:8d87bc453349 482 }
ninoderkinderen 0:8d87bc453349 483 }
ninoderkinderen 0:8d87bc453349 484 break;
ninoderkinderen 0:8d87bc453349 485 }
ninoderkinderen 0:8d87bc453349 486 case IGMP_V2_MEMB_REPORT: {
ninoderkinderen 0:8d87bc453349 487 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
ninoderkinderen 0:8d87bc453349 488 IGMP_STATS_INC(igmp.rx_report);
ninoderkinderen 0:8d87bc453349 489 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
ninoderkinderen 0:8d87bc453349 490 /* This is on a specific group we have already looked up */
ninoderkinderen 0:8d87bc453349 491 group->timer = 0; /* stopped */
ninoderkinderen 0:8d87bc453349 492 group->group_state = IGMP_GROUP_IDLE_MEMBER;
ninoderkinderen 0:8d87bc453349 493 group->last_reporter_flag = 0;
ninoderkinderen 0:8d87bc453349 494 }
ninoderkinderen 0:8d87bc453349 495 break;
ninoderkinderen 0:8d87bc453349 496 }
ninoderkinderen 0:8d87bc453349 497 default: {
ninoderkinderen 0:8d87bc453349 498 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
ninoderkinderen 0:8d87bc453349 499 igmp->igmp_msgtype, group->group_state, &group, group->netif));
ninoderkinderen 0:8d87bc453349 500 IGMP_STATS_INC(igmp.proterr);
ninoderkinderen 0:8d87bc453349 501 break;
ninoderkinderen 0:8d87bc453349 502 }
ninoderkinderen 0:8d87bc453349 503 }
ninoderkinderen 0:8d87bc453349 504
ninoderkinderen 0:8d87bc453349 505 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 506 return;
ninoderkinderen 0:8d87bc453349 507 }
ninoderkinderen 0:8d87bc453349 508
ninoderkinderen 0:8d87bc453349 509 /**
ninoderkinderen 0:8d87bc453349 510 * Join a group on one network interface.
ninoderkinderen 0:8d87bc453349 511 *
ninoderkinderen 0:8d87bc453349 512 * @param ifaddr ip address of the network interface which should join a new group
ninoderkinderen 0:8d87bc453349 513 * @param groupaddr the ip address of the group which to join
ninoderkinderen 0:8d87bc453349 514 * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
ninoderkinderen 0:8d87bc453349 515 */
ninoderkinderen 0:8d87bc453349 516 err_t
ninoderkinderen 0:8d87bc453349 517 igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
ninoderkinderen 0:8d87bc453349 518 {
ninoderkinderen 0:8d87bc453349 519 err_t err = ERR_VAL; /* no matching interface */
ninoderkinderen 0:8d87bc453349 520 struct igmp_group *group;
ninoderkinderen 0:8d87bc453349 521 struct netif *netif;
ninoderkinderen 0:8d87bc453349 522
ninoderkinderen 0:8d87bc453349 523 /* make sure it is multicast address */
ninoderkinderen 0:8d87bc453349 524 LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
ninoderkinderen 0:8d87bc453349 525 LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
ninoderkinderen 0:8d87bc453349 526
ninoderkinderen 0:8d87bc453349 527 /* loop through netif's */
ninoderkinderen 0:8d87bc453349 528 netif = netif_list;
ninoderkinderen 0:8d87bc453349 529 while (netif != NULL) {
ninoderkinderen 0:8d87bc453349 530 /* Should we join this interface ? */
ninoderkinderen 0:8d87bc453349 531 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
ninoderkinderen 0:8d87bc453349 532 /* find group or create a new one if not found */
ninoderkinderen 0:8d87bc453349 533 group = igmp_lookup_group(netif, groupaddr);
ninoderkinderen 0:8d87bc453349 534
ninoderkinderen 0:8d87bc453349 535 if (group != NULL) {
ninoderkinderen 0:8d87bc453349 536 /* This should create a new group, check the state to make sure */
ninoderkinderen 0:8d87bc453349 537 if (group->group_state != IGMP_GROUP_NON_MEMBER) {
ninoderkinderen 0:8d87bc453349 538 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
ninoderkinderen 0:8d87bc453349 539 } else {
ninoderkinderen 0:8d87bc453349 540 /* OK - it was new group */
ninoderkinderen 0:8d87bc453349 541 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
ninoderkinderen 0:8d87bc453349 542 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
ninoderkinderen 0:8d87bc453349 543 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
ninoderkinderen 0:8d87bc453349 544
ninoderkinderen 0:8d87bc453349 545 /* If first use of the group, allow the group at the MAC level */
ninoderkinderen 0:8d87bc453349 546 if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
ninoderkinderen 0:8d87bc453349 547 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
ninoderkinderen 0:8d87bc453349 548 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
ninoderkinderen 0:8d87bc453349 549 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
ninoderkinderen 0:8d87bc453349 550 netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
ninoderkinderen 0:8d87bc453349 551 }
ninoderkinderen 0:8d87bc453349 552
ninoderkinderen 0:8d87bc453349 553 IGMP_STATS_INC(igmp.tx_join);
ninoderkinderen 0:8d87bc453349 554 igmp_send(group, IGMP_V2_MEMB_REPORT);
ninoderkinderen 0:8d87bc453349 555
ninoderkinderen 0:8d87bc453349 556 igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
ninoderkinderen 0:8d87bc453349 557
ninoderkinderen 0:8d87bc453349 558 /* Need to work out where this timer comes from */
ninoderkinderen 0:8d87bc453349 559 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
ninoderkinderen 0:8d87bc453349 560 }
ninoderkinderen 0:8d87bc453349 561 /* Increment group use */
ninoderkinderen 0:8d87bc453349 562 group->use++;
ninoderkinderen 0:8d87bc453349 563 /* Join on this interface */
ninoderkinderen 0:8d87bc453349 564 err = ERR_OK;
ninoderkinderen 0:8d87bc453349 565 } else {
ninoderkinderen 0:8d87bc453349 566 /* Return an error even if some network interfaces are joined */
ninoderkinderen 0:8d87bc453349 567 /** @todo undo any other netif already joined */
ninoderkinderen 0:8d87bc453349 568 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
ninoderkinderen 0:8d87bc453349 569 return ERR_MEM;
ninoderkinderen 0:8d87bc453349 570 }
ninoderkinderen 0:8d87bc453349 571 }
ninoderkinderen 0:8d87bc453349 572 /* proceed to next network interface */
ninoderkinderen 0:8d87bc453349 573 netif = netif->next;
ninoderkinderen 0:8d87bc453349 574 }
ninoderkinderen 0:8d87bc453349 575
ninoderkinderen 0:8d87bc453349 576 return err;
ninoderkinderen 0:8d87bc453349 577 }
ninoderkinderen 0:8d87bc453349 578
ninoderkinderen 0:8d87bc453349 579 /**
ninoderkinderen 0:8d87bc453349 580 * Leave a group on one network interface.
ninoderkinderen 0:8d87bc453349 581 *
ninoderkinderen 0:8d87bc453349 582 * @param ifaddr ip address of the network interface which should leave a group
ninoderkinderen 0:8d87bc453349 583 * @param groupaddr the ip address of the group which to leave
ninoderkinderen 0:8d87bc453349 584 * @return ERR_OK if group was left on the netif(s), an err_t otherwise
ninoderkinderen 0:8d87bc453349 585 */
ninoderkinderen 0:8d87bc453349 586 err_t
ninoderkinderen 0:8d87bc453349 587 igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
ninoderkinderen 0:8d87bc453349 588 {
ninoderkinderen 0:8d87bc453349 589 err_t err = ERR_VAL; /* no matching interface */
ninoderkinderen 0:8d87bc453349 590 struct igmp_group *group;
ninoderkinderen 0:8d87bc453349 591 struct netif *netif;
ninoderkinderen 0:8d87bc453349 592
ninoderkinderen 0:8d87bc453349 593 /* make sure it is multicast address */
ninoderkinderen 0:8d87bc453349 594 LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
ninoderkinderen 0:8d87bc453349 595 LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
ninoderkinderen 0:8d87bc453349 596
ninoderkinderen 0:8d87bc453349 597 /* loop through netif's */
ninoderkinderen 0:8d87bc453349 598 netif = netif_list;
ninoderkinderen 0:8d87bc453349 599 while (netif != NULL) {
ninoderkinderen 0:8d87bc453349 600 /* Should we leave this interface ? */
ninoderkinderen 0:8d87bc453349 601 if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
ninoderkinderen 0:8d87bc453349 602 /* find group */
ninoderkinderen 0:8d87bc453349 603 group = igmp_lookfor_group(netif, groupaddr);
ninoderkinderen 0:8d87bc453349 604
ninoderkinderen 0:8d87bc453349 605 if (group != NULL) {
ninoderkinderen 0:8d87bc453349 606 /* Only send a leave if the flag is set according to the state diagram */
ninoderkinderen 0:8d87bc453349 607 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
ninoderkinderen 0:8d87bc453349 608 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
ninoderkinderen 0:8d87bc453349 609 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
ninoderkinderen 0:8d87bc453349 610
ninoderkinderen 0:8d87bc453349 611 /* If there is no other use of the group */
ninoderkinderen 0:8d87bc453349 612 if (group->use <= 1) {
ninoderkinderen 0:8d87bc453349 613 /* If we are the last reporter for this group */
ninoderkinderen 0:8d87bc453349 614 if (group->last_reporter_flag) {
ninoderkinderen 0:8d87bc453349 615 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
ninoderkinderen 0:8d87bc453349 616 IGMP_STATS_INC(igmp.tx_leave);
ninoderkinderen 0:8d87bc453349 617 igmp_send(group, IGMP_LEAVE_GROUP);
ninoderkinderen 0:8d87bc453349 618 }
ninoderkinderen 0:8d87bc453349 619
ninoderkinderen 0:8d87bc453349 620 /* Disable the group at the MAC level */
ninoderkinderen 0:8d87bc453349 621 if (netif->igmp_mac_filter != NULL) {
ninoderkinderen 0:8d87bc453349 622 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
ninoderkinderen 0:8d87bc453349 623 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
ninoderkinderen 0:8d87bc453349 624 LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
ninoderkinderen 0:8d87bc453349 625 netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
ninoderkinderen 0:8d87bc453349 626 }
ninoderkinderen 0:8d87bc453349 627
ninoderkinderen 0:8d87bc453349 628 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
ninoderkinderen 0:8d87bc453349 629 ip_addr_debug_print(IGMP_DEBUG, groupaddr);
ninoderkinderen 0:8d87bc453349 630 LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
ninoderkinderen 0:8d87bc453349 631
ninoderkinderen 0:8d87bc453349 632 /* Free the group */
ninoderkinderen 0:8d87bc453349 633 igmp_remove_group(group);
ninoderkinderen 0:8d87bc453349 634 } else {
ninoderkinderen 0:8d87bc453349 635 /* Decrement group use */
ninoderkinderen 0:8d87bc453349 636 group->use--;
ninoderkinderen 0:8d87bc453349 637 }
ninoderkinderen 0:8d87bc453349 638 /* Leave on this interface */
ninoderkinderen 0:8d87bc453349 639 err = ERR_OK;
ninoderkinderen 0:8d87bc453349 640 } else {
ninoderkinderen 0:8d87bc453349 641 /* It's not a fatal error on "leavegroup" */
ninoderkinderen 0:8d87bc453349 642 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
ninoderkinderen 0:8d87bc453349 643 }
ninoderkinderen 0:8d87bc453349 644 }
ninoderkinderen 0:8d87bc453349 645 /* proceed to next network interface */
ninoderkinderen 0:8d87bc453349 646 netif = netif->next;
ninoderkinderen 0:8d87bc453349 647 }
ninoderkinderen 0:8d87bc453349 648
ninoderkinderen 0:8d87bc453349 649 return err;
ninoderkinderen 0:8d87bc453349 650 }
ninoderkinderen 0:8d87bc453349 651
ninoderkinderen 0:8d87bc453349 652 /**
ninoderkinderen 0:8d87bc453349 653 * The igmp timer function (both for NO_SYS=1 and =0)
ninoderkinderen 0:8d87bc453349 654 * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
ninoderkinderen 0:8d87bc453349 655 */
ninoderkinderen 0:8d87bc453349 656 void
ninoderkinderen 0:8d87bc453349 657 igmp_tmr(void)
ninoderkinderen 0:8d87bc453349 658 {
ninoderkinderen 0:8d87bc453349 659 struct igmp_group *group = igmp_group_list;
ninoderkinderen 0:8d87bc453349 660
ninoderkinderen 0:8d87bc453349 661 while (group != NULL) {
ninoderkinderen 0:8d87bc453349 662 if (group->timer > 0) {
ninoderkinderen 0:8d87bc453349 663 group->timer--;
ninoderkinderen 0:8d87bc453349 664 if (group->timer == 0) {
ninoderkinderen 0:8d87bc453349 665 igmp_timeout(group);
ninoderkinderen 0:8d87bc453349 666 }
ninoderkinderen 0:8d87bc453349 667 }
ninoderkinderen 0:8d87bc453349 668 group = group->next;
ninoderkinderen 0:8d87bc453349 669 }
ninoderkinderen 0:8d87bc453349 670 }
ninoderkinderen 0:8d87bc453349 671
ninoderkinderen 0:8d87bc453349 672 /**
ninoderkinderen 0:8d87bc453349 673 * Called if a timeout for one group is reached.
ninoderkinderen 0:8d87bc453349 674 * Sends a report for this group.
ninoderkinderen 0:8d87bc453349 675 *
ninoderkinderen 0:8d87bc453349 676 * @param group an igmp_group for which a timeout is reached
ninoderkinderen 0:8d87bc453349 677 */
ninoderkinderen 0:8d87bc453349 678 static void
ninoderkinderen 0:8d87bc453349 679 igmp_timeout(struct igmp_group *group)
ninoderkinderen 0:8d87bc453349 680 {
ninoderkinderen 0:8d87bc453349 681 /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
ninoderkinderen 0:8d87bc453349 682 if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
ninoderkinderen 0:8d87bc453349 683 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
ninoderkinderen 0:8d87bc453349 684 ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
ninoderkinderen 0:8d87bc453349 685 LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
ninoderkinderen 0:8d87bc453349 686
ninoderkinderen 0:8d87bc453349 687 IGMP_STATS_INC(igmp.tx_report);
ninoderkinderen 0:8d87bc453349 688 igmp_send(group, IGMP_V2_MEMB_REPORT);
ninoderkinderen 0:8d87bc453349 689 }
ninoderkinderen 0:8d87bc453349 690 }
ninoderkinderen 0:8d87bc453349 691
ninoderkinderen 0:8d87bc453349 692 /**
ninoderkinderen 0:8d87bc453349 693 * Start a timer for an igmp group
ninoderkinderen 0:8d87bc453349 694 *
ninoderkinderen 0:8d87bc453349 695 * @param group the igmp_group for which to start a timer
ninoderkinderen 0:8d87bc453349 696 * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
ninoderkinderen 0:8d87bc453349 697 * every call to igmp_tmr())
ninoderkinderen 0:8d87bc453349 698 */
ninoderkinderen 0:8d87bc453349 699 static void
ninoderkinderen 0:8d87bc453349 700 igmp_start_timer(struct igmp_group *group, u8_t max_time)
ninoderkinderen 0:8d87bc453349 701 {
ninoderkinderen 0:8d87bc453349 702 /* ensure the input value is > 0 */
ninoderkinderen 0:8d87bc453349 703 if (max_time == 0) {
ninoderkinderen 0:8d87bc453349 704 max_time = 1;
ninoderkinderen 0:8d87bc453349 705 }
ninoderkinderen 0:8d87bc453349 706 /* ensure the random value is > 0 */
ninoderkinderen 0:8d87bc453349 707 group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
ninoderkinderen 0:8d87bc453349 708 }
ninoderkinderen 0:8d87bc453349 709
ninoderkinderen 0:8d87bc453349 710 /**
ninoderkinderen 0:8d87bc453349 711 * Stop a timer for an igmp_group
ninoderkinderen 0:8d87bc453349 712 *
ninoderkinderen 0:8d87bc453349 713 * @param group the igmp_group for which to stop the timer
ninoderkinderen 0:8d87bc453349 714 */
ninoderkinderen 0:8d87bc453349 715 static void
ninoderkinderen 0:8d87bc453349 716 igmp_stop_timer(struct igmp_group *group)
ninoderkinderen 0:8d87bc453349 717 {
ninoderkinderen 0:8d87bc453349 718 group->timer = 0;
ninoderkinderen 0:8d87bc453349 719 }
ninoderkinderen 0:8d87bc453349 720
ninoderkinderen 0:8d87bc453349 721 /**
ninoderkinderen 0:8d87bc453349 722 * Delaying membership report for a group if necessary
ninoderkinderen 0:8d87bc453349 723 *
ninoderkinderen 0:8d87bc453349 724 * @param group the igmp_group for which "delaying" membership report
ninoderkinderen 0:8d87bc453349 725 * @param maxresp query delay
ninoderkinderen 0:8d87bc453349 726 */
ninoderkinderen 0:8d87bc453349 727 static void
ninoderkinderen 0:8d87bc453349 728 igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
ninoderkinderen 0:8d87bc453349 729 {
ninoderkinderen 0:8d87bc453349 730 if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
ninoderkinderen 0:8d87bc453349 731 ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
ninoderkinderen 0:8d87bc453349 732 ((group->timer == 0) || (maxresp < group->timer)))) {
ninoderkinderen 0:8d87bc453349 733 igmp_start_timer(group, maxresp);
ninoderkinderen 0:8d87bc453349 734 group->group_state = IGMP_GROUP_DELAYING_MEMBER;
ninoderkinderen 0:8d87bc453349 735 }
ninoderkinderen 0:8d87bc453349 736 }
ninoderkinderen 0:8d87bc453349 737
ninoderkinderen 0:8d87bc453349 738
ninoderkinderen 0:8d87bc453349 739 /**
ninoderkinderen 0:8d87bc453349 740 * Sends an IP packet on a network interface. This function constructs the IP header
ninoderkinderen 0:8d87bc453349 741 * and calculates the IP header checksum. If the source IP address is NULL,
ninoderkinderen 0:8d87bc453349 742 * the IP address of the outgoing network interface is filled in as source address.
ninoderkinderen 0:8d87bc453349 743 *
ninoderkinderen 0:8d87bc453349 744 * @param p the packet to send (p->payload points to the data, e.g. next
ninoderkinderen 0:8d87bc453349 745 protocol header; if dest == IP_HDRINCL, p already includes an IP
ninoderkinderen 0:8d87bc453349 746 header and p->payload points to that IP header)
ninoderkinderen 0:8d87bc453349 747 * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
ninoderkinderen 0:8d87bc453349 748 * IP address of the netif used to send is used as source address)
ninoderkinderen 0:8d87bc453349 749 * @param dest the destination IP address to send the packet to
ninoderkinderen 0:8d87bc453349 750 * @param ttl the TTL value to be set in the IP header
ninoderkinderen 0:8d87bc453349 751 * @param proto the PROTOCOL to be set in the IP header
ninoderkinderen 0:8d87bc453349 752 * @param netif the netif on which to send this packet
ninoderkinderen 0:8d87bc453349 753 * @return ERR_OK if the packet was sent OK
ninoderkinderen 0:8d87bc453349 754 * ERR_BUF if p doesn't have enough space for IP/LINK headers
ninoderkinderen 0:8d87bc453349 755 * returns errors returned by netif->output
ninoderkinderen 0:8d87bc453349 756 */
ninoderkinderen 0:8d87bc453349 757 static err_t
ninoderkinderen 0:8d87bc453349 758 igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif)
ninoderkinderen 0:8d87bc453349 759 {
ninoderkinderen 0:8d87bc453349 760 /* This is the "router alert" option */
ninoderkinderen 0:8d87bc453349 761 u16_t ra[2];
ninoderkinderen 0:8d87bc453349 762 ra[0] = PP_HTONS(ROUTER_ALERT);
ninoderkinderen 0:8d87bc453349 763 ra[1] = 0x0000; /* Router shall examine packet */
ninoderkinderen 0:8d87bc453349 764 IGMP_STATS_INC(igmp.xmit);
ninoderkinderen 0:8d87bc453349 765 return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
ninoderkinderen 0:8d87bc453349 766 }
ninoderkinderen 0:8d87bc453349 767
ninoderkinderen 0:8d87bc453349 768 /**
ninoderkinderen 0:8d87bc453349 769 * Send an igmp packet to a specific group.
ninoderkinderen 0:8d87bc453349 770 *
ninoderkinderen 0:8d87bc453349 771 * @param group the group to which to send the packet
ninoderkinderen 0:8d87bc453349 772 * @param type the type of igmp packet to send
ninoderkinderen 0:8d87bc453349 773 */
ninoderkinderen 0:8d87bc453349 774 static void
ninoderkinderen 0:8d87bc453349 775 igmp_send(struct igmp_group *group, u8_t type)
ninoderkinderen 0:8d87bc453349 776 {
ninoderkinderen 0:8d87bc453349 777 struct pbuf* p = NULL;
ninoderkinderen 0:8d87bc453349 778 struct igmp_msg* igmp = NULL;
ninoderkinderen 0:8d87bc453349 779 ip_addr_t src = *IP_ADDR_ANY;
ninoderkinderen 0:8d87bc453349 780 ip_addr_t* dest = NULL;
ninoderkinderen 0:8d87bc453349 781
ninoderkinderen 0:8d87bc453349 782 /* IP header + "router alert" option + IGMP header */
ninoderkinderen 0:8d87bc453349 783 p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
ninoderkinderen 0:8d87bc453349 784
ninoderkinderen 0:8d87bc453349 785 if (p) {
ninoderkinderen 0:8d87bc453349 786 igmp = (struct igmp_msg *)p->payload;
ninoderkinderen 0:8d87bc453349 787 LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
ninoderkinderen 0:8d87bc453349 788 (p->len >= sizeof(struct igmp_msg)));
ninoderkinderen 0:8d87bc453349 789 ip_addr_copy(src, group->netif->ip_addr);
ninoderkinderen 0:8d87bc453349 790
ninoderkinderen 0:8d87bc453349 791 if (type == IGMP_V2_MEMB_REPORT) {
ninoderkinderen 0:8d87bc453349 792 dest = &(group->group_address);
ninoderkinderen 0:8d87bc453349 793 ip_addr_copy(igmp->igmp_group_address, group->group_address);
ninoderkinderen 0:8d87bc453349 794 group->last_reporter_flag = 1; /* Remember we were the last to report */
ninoderkinderen 0:8d87bc453349 795 } else {
ninoderkinderen 0:8d87bc453349 796 if (type == IGMP_LEAVE_GROUP) {
ninoderkinderen 0:8d87bc453349 797 dest = &allrouters;
ninoderkinderen 0:8d87bc453349 798 ip_addr_copy(igmp->igmp_group_address, group->group_address);
ninoderkinderen 0:8d87bc453349 799 }
ninoderkinderen 0:8d87bc453349 800 }
ninoderkinderen 0:8d87bc453349 801
ninoderkinderen 0:8d87bc453349 802 if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
ninoderkinderen 0:8d87bc453349 803 igmp->igmp_msgtype = type;
ninoderkinderen 0:8d87bc453349 804 igmp->igmp_maxresp = 0;
ninoderkinderen 0:8d87bc453349 805 igmp->igmp_checksum = 0;
ninoderkinderen 0:8d87bc453349 806 igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
ninoderkinderen 0:8d87bc453349 807
ninoderkinderen 0:8d87bc453349 808 igmp_ip_output_if(p, &src, dest, group->netif);
ninoderkinderen 0:8d87bc453349 809 }
ninoderkinderen 0:8d87bc453349 810
ninoderkinderen 0:8d87bc453349 811 pbuf_free(p);
ninoderkinderen 0:8d87bc453349 812 } else {
ninoderkinderen 0:8d87bc453349 813 LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
ninoderkinderen 0:8d87bc453349 814 IGMP_STATS_INC(igmp.memerr);
ninoderkinderen 0:8d87bc453349 815 }
ninoderkinderen 0:8d87bc453349 816 }
ninoderkinderen 0:8d87bc453349 817
ninoderkinderen 0:8d87bc453349 818 #endif /* LWIP_IGMP */