Donatien Garnier
NetServices Stack source
Dependents: HelloWorld ServoInterfaceBoardExample1 4180_Lab4
lwip/core/ipv4/igmp.c@5:dd63a1e02b1b, 2010-07-27 (annotated)
- Committer:
- donatien
- Date:
- Tue Jul 27 15:59:42 2010 +0000
- Revision:
- 5:dd63a1e02b1b
- Parent:
- 0:632c9925f013
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| donatien | 0:632c9925f013 | 1 | /** |
| donatien | 0:632c9925f013 | 2 | * @file |
| donatien | 0:632c9925f013 | 3 | * IGMP - Internet Group Management Protocol |
| donatien | 0:632c9925f013 | 4 | * |
| donatien | 0:632c9925f013 | 5 | */ |
| donatien | 0:632c9925f013 | 6 | |
| donatien | 0:632c9925f013 | 7 | /* |
| donatien | 0:632c9925f013 | 8 | * Copyright (c) 2002 CITEL Technologies Ltd. |
| donatien | 0:632c9925f013 | 9 | * All rights reserved. |
| donatien | 0:632c9925f013 | 10 | * |
| donatien | 0:632c9925f013 | 11 | * Redistribution and use in source and binary forms, with or without |
| donatien | 0:632c9925f013 | 12 | * modification, are permitted provided that the following conditions |
| donatien | 0:632c9925f013 | 13 | * are met: |
| donatien | 0:632c9925f013 | 14 | * 1. Redistributions of source code must retain the above copyright |
| donatien | 0:632c9925f013 | 15 | * notice, this list of conditions and the following disclaimer. |
| donatien | 0:632c9925f013 | 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| donatien | 0:632c9925f013 | 17 | * notice, this list of conditions and the following disclaimer in the |
| donatien | 0:632c9925f013 | 18 | * documentation and/or other materials provided with the distribution. |
| donatien | 0:632c9925f013 | 19 | * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors |
| donatien | 0:632c9925f013 | 20 | * may be used to endorse or promote products derived from this software |
| donatien | 0:632c9925f013 | 21 | * without specific prior written permission. |
| donatien | 0:632c9925f013 | 22 | * |
| donatien | 0:632c9925f013 | 23 | * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS'' |
| donatien | 0:632c9925f013 | 24 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| donatien | 0:632c9925f013 | 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| donatien | 0:632c9925f013 | 26 | * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE |
| donatien | 0:632c9925f013 | 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| donatien | 0:632c9925f013 | 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| donatien | 0:632c9925f013 | 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| donatien | 0:632c9925f013 | 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| donatien | 0:632c9925f013 | 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| donatien | 0:632c9925f013 | 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| donatien | 0:632c9925f013 | 33 | * SUCH DAMAGE. |
| donatien | 0:632c9925f013 | 34 | * |
| donatien | 0:632c9925f013 | 35 | * This file is a contribution to the lwIP TCP/IP stack. |
| donatien | 0:632c9925f013 | 36 | * The Swedish Institute of Computer Science and Adam Dunkels |
| donatien | 0:632c9925f013 | 37 | * are specifically granted permission to redistribute this |
| donatien | 0:632c9925f013 | 38 | * source code. |
| donatien | 0:632c9925f013 | 39 | */ |
| donatien | 0:632c9925f013 | 40 | |
| donatien | 0:632c9925f013 | 41 | /*------------------------------------------------------------- |
| donatien | 0:632c9925f013 | 42 | Note 1) |
| donatien | 0:632c9925f013 | 43 | Although the rfc requires V1 AND V2 capability |
| donatien | 0:632c9925f013 | 44 | we will only support v2 since now V1 is very old (August 1989) |
| donatien | 0:632c9925f013 | 45 | V1 can be added if required |
| donatien | 0:632c9925f013 | 46 | |
| donatien | 0:632c9925f013 | 47 | a debug print and statistic have been implemented to |
| donatien | 0:632c9925f013 | 48 | show this up. |
| donatien | 0:632c9925f013 | 49 | ------------------------------------------------------------- |
| donatien | 0:632c9925f013 | 50 | ------------------------------------------------------------- |
| donatien | 0:632c9925f013 | 51 | Note 2) |
| donatien | 0:632c9925f013 | 52 | A query for a specific group address (as opposed to ALLHOSTS) |
| donatien | 0:632c9925f013 | 53 | has now been implemented as I am unsure if it is required |
| donatien | 0:632c9925f013 | 54 | |
| donatien | 0:632c9925f013 | 55 | a debug print and statistic have been implemented to |
| donatien | 0:632c9925f013 | 56 | show this up. |
| donatien | 0:632c9925f013 | 57 | ------------------------------------------------------------- |
| donatien | 0:632c9925f013 | 58 | ------------------------------------------------------------- |
| donatien | 0:632c9925f013 | 59 | Note 3) |
| donatien | 0:632c9925f013 | 60 | The router alert rfc 2113 is implemented in outgoing packets |
| donatien | 0:632c9925f013 | 61 | but not checked rigorously incoming |
| donatien | 0:632c9925f013 | 62 | ------------------------------------------------------------- |
| donatien | 0:632c9925f013 | 63 | Steve Reynolds |
| donatien | 0:632c9925f013 | 64 | ------------------------------------------------------------*/ |
| donatien | 0:632c9925f013 | 65 | |
| donatien | 0:632c9925f013 | 66 | /*----------------------------------------------------------------------------- |
| donatien | 0:632c9925f013 | 67 | * RFC 988 - Host extensions for IP multicasting - V0 |
| donatien | 0:632c9925f013 | 68 | * RFC 1054 - Host extensions for IP multicasting - |
| donatien | 0:632c9925f013 | 69 | * RFC 1112 - Host extensions for IP multicasting - V1 |
| donatien | 0:632c9925f013 | 70 | * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard) |
| donatien | 0:632c9925f013 | 71 | * RFC 3376 - Internet Group Management Protocol, Version 3 - V3 |
| donatien | 0:632c9925f013 | 72 | * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+ |
| donatien | 0:632c9925f013 | 73 | * RFC 2113 - IP Router Alert Option - |
| donatien | 0:632c9925f013 | 74 | *----------------------------------------------------------------------------*/ |
| donatien | 0:632c9925f013 | 75 | |
| donatien | 0:632c9925f013 | 76 | /*----------------------------------------------------------------------------- |
| donatien | 0:632c9925f013 | 77 | * Includes |
| donatien | 0:632c9925f013 | 78 | *----------------------------------------------------------------------------*/ |
| donatien | 0:632c9925f013 | 79 | |
| donatien | 0:632c9925f013 | 80 | #include "lwip/opt.h" |
| donatien | 0:632c9925f013 | 81 | |
| donatien | 0:632c9925f013 | 82 | #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */ |
| donatien | 0:632c9925f013 | 83 | |
| donatien | 0:632c9925f013 | 84 | #include "lwip/igmp.h" |
| donatien | 0:632c9925f013 | 85 | #include "lwip/debug.h" |
| donatien | 0:632c9925f013 | 86 | #include "lwip/def.h" |
| donatien | 0:632c9925f013 | 87 | #include "lwip/mem.h" |
| donatien | 0:632c9925f013 | 88 | #include "lwip/ip.h" |
| donatien | 0:632c9925f013 | 89 | #include "lwip/inet_chksum.h" |
| donatien | 0:632c9925f013 | 90 | #include "lwip/netif.h" |
| donatien | 0:632c9925f013 | 91 | #include "lwip/icmp.h" |
| donatien | 0:632c9925f013 | 92 | #include "lwip/udp.h" |
| donatien | 0:632c9925f013 | 93 | #include "lwip/tcp.h" |
| donatien | 0:632c9925f013 | 94 | #include "lwip/stats.h" |
| donatien | 0:632c9925f013 | 95 | |
| donatien | 0:632c9925f013 | 96 | #include "string.h" |
| donatien | 0:632c9925f013 | 97 | |
| donatien | 0:632c9925f013 | 98 | /* |
| donatien | 0:632c9925f013 | 99 | * IGMP constants |
| donatien | 0:632c9925f013 | 100 | */ |
| donatien | 0:632c9925f013 | 101 | #define IGMP_TTL 1 |
| donatien | 0:632c9925f013 | 102 | #define IGMP_MINLEN 8 |
| donatien | 0:632c9925f013 | 103 | #define ROUTER_ALERT 0x9404 |
| donatien | 0:632c9925f013 | 104 | #define ROUTER_ALERTLEN 4 |
| donatien | 0:632c9925f013 | 105 | |
| donatien | 0:632c9925f013 | 106 | /* |
| donatien | 0:632c9925f013 | 107 | * IGMP message types, including version number. |
| donatien | 0:632c9925f013 | 108 | */ |
| donatien | 0:632c9925f013 | 109 | #define IGMP_MEMB_QUERY 0x11 /* Membership query */ |
| donatien | 0:632c9925f013 | 110 | #define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */ |
| donatien | 0:632c9925f013 | 111 | #define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */ |
| donatien | 0:632c9925f013 | 112 | #define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */ |
| donatien | 0:632c9925f013 | 113 | |
| donatien | 0:632c9925f013 | 114 | /* Group membership states */ |
| donatien | 0:632c9925f013 | 115 | #define IGMP_GROUP_NON_MEMBER 0 |
| donatien | 0:632c9925f013 | 116 | #define IGMP_GROUP_DELAYING_MEMBER 1 |
| donatien | 0:632c9925f013 | 117 | #define IGMP_GROUP_IDLE_MEMBER 2 |
| donatien | 0:632c9925f013 | 118 | |
| donatien | 0:632c9925f013 | 119 | /** |
| donatien | 0:632c9925f013 | 120 | * IGMP packet format. |
| donatien | 0:632c9925f013 | 121 | */ |
| donatien | 0:632c9925f013 | 122 | #ifdef PACK_STRUCT_USE_INCLUDES |
| donatien | 0:632c9925f013 | 123 | # include "arch/bpstruct.h" |
| donatien | 0:632c9925f013 | 124 | #endif |
| donatien | 0:632c9925f013 | 125 | PACK_STRUCT_BEGIN |
| donatien | 0:632c9925f013 | 126 | struct igmp_msg { |
| donatien | 0:632c9925f013 | 127 | PACK_STRUCT_FIELD(u8_t igmp_msgtype); |
| donatien | 0:632c9925f013 | 128 | PACK_STRUCT_FIELD(u8_t igmp_maxresp); |
| donatien | 0:632c9925f013 | 129 | PACK_STRUCT_FIELD(u16_t igmp_checksum); |
| donatien | 5:dd63a1e02b1b | 130 | PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address); |
| donatien | 0:632c9925f013 | 131 | } PACK_STRUCT_STRUCT; |
| donatien | 0:632c9925f013 | 132 | PACK_STRUCT_END |
| donatien | 0:632c9925f013 | 133 | #ifdef PACK_STRUCT_USE_INCLUDES |
| donatien | 0:632c9925f013 | 134 | # include "arch/epstruct.h" |
| donatien | 0:632c9925f013 | 135 | #endif |
| donatien | 0:632c9925f013 | 136 | |
| donatien | 0:632c9925f013 | 137 | |
| donatien | 0:632c9925f013 | 138 | static struct igmp_group *igmp_lookup_group(struct netif *ifp, ip_addr_t *addr); |
| donatien | 0:632c9925f013 | 139 | static err_t igmp_remove_group(struct igmp_group *group); |
| donatien | 0:632c9925f013 | 140 | static void igmp_timeout( struct igmp_group *group); |
| donatien | 0:632c9925f013 | 141 | static void igmp_start_timer(struct igmp_group *group, u8_t max_time); |
| donatien | 0:632c9925f013 | 142 | static void igmp_stop_timer(struct igmp_group *group); |
| donatien | 0:632c9925f013 | 143 | static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp); |
| donatien | 0:632c9925f013 | 144 | static err_t igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif); |
| donatien | 0:632c9925f013 | 145 | static void igmp_send(struct igmp_group *group, u8_t type); |
| donatien | 0:632c9925f013 | 146 | |
| donatien | 0:632c9925f013 | 147 | |
| donatien | 0:632c9925f013 | 148 | static struct igmp_group* igmp_group_list; |
| donatien | 0:632c9925f013 | 149 | static ip_addr_t allsystems; |
| donatien | 0:632c9925f013 | 150 | static ip_addr_t allrouters; |
| donatien | 0:632c9925f013 | 151 | |
| donatien | 0:632c9925f013 | 152 | |
| donatien | 0:632c9925f013 | 153 | /** |
| donatien | 0:632c9925f013 | 154 | * Initialize the IGMP module |
| donatien | 0:632c9925f013 | 155 | */ |
| donatien | 0:632c9925f013 | 156 | void |
| donatien | 0:632c9925f013 | 157 | igmp_init(void) |
| donatien | 0:632c9925f013 | 158 | { |
| donatien | 0:632c9925f013 | 159 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n")); |
| donatien | 0:632c9925f013 | 160 | |
| donatien | 0:632c9925f013 | 161 | IP4_ADDR(&allsystems, 224, 0, 0, 1); |
| donatien | 0:632c9925f013 | 162 | IP4_ADDR(&allrouters, 224, 0, 0, 2); |
| donatien | 0:632c9925f013 | 163 | } |
| donatien | 0:632c9925f013 | 164 | |
| donatien | 0:632c9925f013 | 165 | #ifdef LWIP_DEBUG |
| donatien | 0:632c9925f013 | 166 | /** |
| donatien | 0:632c9925f013 | 167 | * Dump global IGMP groups list |
| donatien | 0:632c9925f013 | 168 | */ |
| donatien | 0:632c9925f013 | 169 | void |
| donatien | 0:632c9925f013 | 170 | igmp_dump_group_list() |
| donatien | 0:632c9925f013 | 171 | { |
| donatien | 0:632c9925f013 | 172 | struct igmp_group *group = igmp_group_list; |
| donatien | 0:632c9925f013 | 173 | |
| donatien | 0:632c9925f013 | 174 | while (group != NULL) { |
| donatien | 0:632c9925f013 | 175 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state))); |
| donatien | 0:632c9925f013 | 176 | ip_addr_debug_print(IGMP_DEBUG, &group->group_address); |
| donatien | 0:632c9925f013 | 177 | LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif)); |
| donatien | 0:632c9925f013 | 178 | group = group->next; |
| donatien | 0:632c9925f013 | 179 | } |
| donatien | 0:632c9925f013 | 180 | LWIP_DEBUGF(IGMP_DEBUG, ("\n")); |
| donatien | 0:632c9925f013 | 181 | } |
| donatien | 0:632c9925f013 | 182 | #else |
| donatien | 0:632c9925f013 | 183 | #define igmp_dump_group_list() |
| donatien | 0:632c9925f013 | 184 | #endif /* LWIP_DEBUG */ |
| donatien | 0:632c9925f013 | 185 | |
| donatien | 0:632c9925f013 | 186 | /** |
| donatien | 0:632c9925f013 | 187 | * Start IGMP processing on interface |
| donatien | 0:632c9925f013 | 188 | * |
| donatien | 0:632c9925f013 | 189 | * @param netif network interface on which start IGMP processing |
| donatien | 0:632c9925f013 | 190 | */ |
| donatien | 0:632c9925f013 | 191 | err_t |
| donatien | 0:632c9925f013 | 192 | igmp_start(struct netif *netif) |
| donatien | 0:632c9925f013 | 193 | { |
| donatien | 0:632c9925f013 | 194 | struct igmp_group* group; |
| donatien | 0:632c9925f013 | 195 | |
| donatien | 0:632c9925f013 | 196 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif)); |
| donatien | 0:632c9925f013 | 197 | |
| donatien | 0:632c9925f013 | 198 | group = igmp_lookup_group(netif, &allsystems); |
| donatien | 0:632c9925f013 | 199 | |
| donatien | 0:632c9925f013 | 200 | if (group != NULL) { |
| donatien | 0:632c9925f013 | 201 | group->group_state = IGMP_GROUP_IDLE_MEMBER; |
| donatien | 0:632c9925f013 | 202 | group->use++; |
| donatien | 0:632c9925f013 | 203 | |
| donatien | 0:632c9925f013 | 204 | /* Allow the igmp messages at the MAC level */ |
| donatien | 0:632c9925f013 | 205 | if (netif->igmp_mac_filter != NULL) { |
| donatien | 0:632c9925f013 | 206 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD ")); |
| donatien | 0:632c9925f013 | 207 | ip_addr_debug_print(IGMP_DEBUG, &allsystems); |
| donatien | 0:632c9925f013 | 208 | LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif)); |
| donatien | 0:632c9925f013 | 209 | netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER); |
| donatien | 0:632c9925f013 | 210 | } |
| donatien | 0:632c9925f013 | 211 | |
| donatien | 0:632c9925f013 | 212 | return ERR_OK; |
| donatien | 0:632c9925f013 | 213 | } |
| donatien | 0:632c9925f013 | 214 | |
| donatien | 0:632c9925f013 | 215 | return ERR_MEM; |
| donatien | 0:632c9925f013 | 216 | } |
| donatien | 0:632c9925f013 | 217 | |
| donatien | 0:632c9925f013 | 218 | /** |
| donatien | 0:632c9925f013 | 219 | * Stop IGMP processing on interface |
| donatien | 0:632c9925f013 | 220 | * |
| donatien | 0:632c9925f013 | 221 | * @param netif network interface on which stop IGMP processing |
| donatien | 0:632c9925f013 | 222 | */ |
| donatien | 0:632c9925f013 | 223 | err_t |
| donatien | 0:632c9925f013 | 224 | igmp_stop(struct netif *netif) |
| donatien | 0:632c9925f013 | 225 | { |
| donatien | 0:632c9925f013 | 226 | struct igmp_group *group = igmp_group_list; |
| donatien | 0:632c9925f013 | 227 | struct igmp_group *prev = NULL; |
| donatien | 0:632c9925f013 | 228 | struct igmp_group *next; |
| donatien | 0:632c9925f013 | 229 | |
| donatien | 0:632c9925f013 | 230 | /* look for groups joined on this interface further down the list */ |
| donatien | 0:632c9925f013 | 231 | while (group != NULL) { |
| donatien | 0:632c9925f013 | 232 | next = group->next; |
| donatien | 0:632c9925f013 | 233 | /* is it a group joined on this interface? */ |
| donatien | 0:632c9925f013 | 234 | if (group->netif == netif) { |
| donatien | 0:632c9925f013 | 235 | /* is it the first group of the list? */ |
| donatien | 0:632c9925f013 | 236 | if (group == igmp_group_list) { |
| donatien | 0:632c9925f013 | 237 | igmp_group_list = next; |
| donatien | 0:632c9925f013 | 238 | } |
| donatien | 0:632c9925f013 | 239 | /* is there a "previous" group defined? */ |
| donatien | 0:632c9925f013 | 240 | if (prev != NULL) { |
| donatien | 0:632c9925f013 | 241 | prev->next = next; |
| donatien | 0:632c9925f013 | 242 | } |
| donatien | 0:632c9925f013 | 243 | /* disable the group at the MAC level */ |
| donatien | 0:632c9925f013 | 244 | if (netif->igmp_mac_filter != NULL) { |
| donatien | 0:632c9925f013 | 245 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL ")); |
| donatien | 0:632c9925f013 | 246 | ip_addr_debug_print(IGMP_DEBUG, &group->group_address); |
| donatien | 0:632c9925f013 | 247 | LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif)); |
| donatien | 0:632c9925f013 | 248 | netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER); |
| donatien | 0:632c9925f013 | 249 | } |
| donatien | 0:632c9925f013 | 250 | /* free group */ |
| donatien | 0:632c9925f013 | 251 | memp_free(MEMP_IGMP_GROUP, group); |
| donatien | 0:632c9925f013 | 252 | } else { |
| donatien | 0:632c9925f013 | 253 | /* change the "previous" */ |
| donatien | 0:632c9925f013 | 254 | prev = group; |
| donatien | 0:632c9925f013 | 255 | } |
| donatien | 0:632c9925f013 | 256 | /* move to "next" */ |
| donatien | 0:632c9925f013 | 257 | group = next; |
| donatien | 0:632c9925f013 | 258 | } |
| donatien | 0:632c9925f013 | 259 | return ERR_OK; |
| donatien | 0:632c9925f013 | 260 | } |
| donatien | 0:632c9925f013 | 261 | |
| donatien | 0:632c9925f013 | 262 | /** |
| donatien | 0:632c9925f013 | 263 | * Report IGMP memberships for this interface |
| donatien | 0:632c9925f013 | 264 | * |
| donatien | 0:632c9925f013 | 265 | * @param netif network interface on which report IGMP memberships |
| donatien | 0:632c9925f013 | 266 | */ |
| donatien | 0:632c9925f013 | 267 | void |
| donatien | 0:632c9925f013 | 268 | igmp_report_groups(struct netif *netif) |
| donatien | 0:632c9925f013 | 269 | { |
| donatien | 0:632c9925f013 | 270 | struct igmp_group *group = igmp_group_list; |
| donatien | 0:632c9925f013 | 271 | |
| donatien | 0:632c9925f013 | 272 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif)); |
| donatien | 0:632c9925f013 | 273 | |
| donatien | 0:632c9925f013 | 274 | while (group != NULL) { |
| donatien | 0:632c9925f013 | 275 | if (group->netif == netif) { |
| donatien | 0:632c9925f013 | 276 | igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR); |
| donatien | 0:632c9925f013 | 277 | } |
| donatien | 0:632c9925f013 | 278 | group = group->next; |
| donatien | 0:632c9925f013 | 279 | } |
| donatien | 0:632c9925f013 | 280 | } |
| donatien | 0:632c9925f013 | 281 | |
| donatien | 0:632c9925f013 | 282 | /** |
| donatien | 0:632c9925f013 | 283 | * Search for a group in the global igmp_group_list |
| donatien | 0:632c9925f013 | 284 | * |
| donatien | 0:632c9925f013 | 285 | * @param ifp the network interface for which to look |
| donatien | 0:632c9925f013 | 286 | * @param addr the group ip address to search for |
| donatien | 0:632c9925f013 | 287 | * @return a struct igmp_group* if the group has been found, |
| donatien | 0:632c9925f013 | 288 | * NULL if the group wasn't found. |
| donatien | 0:632c9925f013 | 289 | */ |
| donatien | 0:632c9925f013 | 290 | struct igmp_group * |
| donatien | 0:632c9925f013 | 291 | igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr) |
| donatien | 0:632c9925f013 | 292 | { |
| donatien | 0:632c9925f013 | 293 | struct igmp_group *group = igmp_group_list; |
| donatien | 0:632c9925f013 | 294 | |
| donatien | 0:632c9925f013 | 295 | while (group != NULL) { |
| donatien | 0:632c9925f013 | 296 | if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) { |
| donatien | 0:632c9925f013 | 297 | return group; |
| donatien | 0:632c9925f013 | 298 | } |
| donatien | 0:632c9925f013 | 299 | group = group->next; |
| donatien | 0:632c9925f013 | 300 | } |
| donatien | 0:632c9925f013 | 301 | |
| donatien | 0:632c9925f013 | 302 | /* to be clearer, we return NULL here instead of |
| donatien | 0:632c9925f013 | 303 | * 'group' (which is also NULL at this point). |
| donatien | 0:632c9925f013 | 304 | */ |
| donatien | 0:632c9925f013 | 305 | return NULL; |
| donatien | 0:632c9925f013 | 306 | } |
| donatien | 0:632c9925f013 | 307 | |
| donatien | 0:632c9925f013 | 308 | /** |
| donatien | 0:632c9925f013 | 309 | * Search for a specific igmp group and create a new one if not found- |
| donatien | 0:632c9925f013 | 310 | * |
| donatien | 0:632c9925f013 | 311 | * @param ifp the network interface for which to look |
| donatien | 0:632c9925f013 | 312 | * @param addr the group ip address to search |
| donatien | 0:632c9925f013 | 313 | * @return a struct igmp_group*, |
| donatien | 0:632c9925f013 | 314 | * NULL on memory error. |
| donatien | 0:632c9925f013 | 315 | */ |
| donatien | 0:632c9925f013 | 316 | struct igmp_group * |
| donatien | 0:632c9925f013 | 317 | igmp_lookup_group(struct netif *ifp, ip_addr_t *addr) |
| donatien | 0:632c9925f013 | 318 | { |
| donatien | 0:632c9925f013 | 319 | struct igmp_group *group = igmp_group_list; |
| donatien | 0:632c9925f013 | 320 | |
| donatien | 0:632c9925f013 | 321 | /* Search if the group already exists */ |
| donatien | 0:632c9925f013 | 322 | group = igmp_lookfor_group(ifp, addr); |
| donatien | 0:632c9925f013 | 323 | if (group != NULL) { |
| donatien | 0:632c9925f013 | 324 | /* Group already exists. */ |
| donatien | 0:632c9925f013 | 325 | return group; |
| donatien | 0:632c9925f013 | 326 | } |
| donatien | 0:632c9925f013 | 327 | |
| donatien | 0:632c9925f013 | 328 | /* Group doesn't exist yet, create a new one */ |
| donatien | 5:dd63a1e02b1b | 329 | group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP); |
| donatien | 0:632c9925f013 | 330 | if (group != NULL) { |
| donatien | 0:632c9925f013 | 331 | group->netif = ifp; |
| donatien | 0:632c9925f013 | 332 | ip_addr_set(&(group->group_address), addr); |
| donatien | 0:632c9925f013 | 333 | group->timer = 0; /* Not running */ |
| donatien | 0:632c9925f013 | 334 | group->group_state = IGMP_GROUP_NON_MEMBER; |
| donatien | 0:632c9925f013 | 335 | group->last_reporter_flag = 0; |
| donatien | 0:632c9925f013 | 336 | group->use = 0; |
| donatien | 0:632c9925f013 | 337 | group->next = igmp_group_list; |
| donatien | 0:632c9925f013 | 338 | |
| donatien | 0:632c9925f013 | 339 | igmp_group_list = group; |
| donatien | 0:632c9925f013 | 340 | } |
| donatien | 0:632c9925f013 | 341 | |
| donatien | 0:632c9925f013 | 342 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to "))); |
| donatien | 0:632c9925f013 | 343 | ip_addr_debug_print(IGMP_DEBUG, addr); |
| donatien | 0:632c9925f013 | 344 | LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp)); |
| donatien | 0:632c9925f013 | 345 | |
| donatien | 0:632c9925f013 | 346 | return group; |
| donatien | 0:632c9925f013 | 347 | } |
| donatien | 0:632c9925f013 | 348 | |
| donatien | 0:632c9925f013 | 349 | /** |
| donatien | 0:632c9925f013 | 350 | * Remove a group in the global igmp_group_list |
| donatien | 0:632c9925f013 | 351 | * |
| donatien | 0:632c9925f013 | 352 | * @param group the group to remove from the global igmp_group_list |
| donatien | 0:632c9925f013 | 353 | * @return ERR_OK if group was removed from the list, an err_t otherwise |
| donatien | 0:632c9925f013 | 354 | */ |
| donatien | 0:632c9925f013 | 355 | static err_t |
| donatien | 0:632c9925f013 | 356 | igmp_remove_group(struct igmp_group *group) |
| donatien | 0:632c9925f013 | 357 | { |
| donatien | 0:632c9925f013 | 358 | err_t err = ERR_OK; |
| donatien | 0:632c9925f013 | 359 | |
| donatien | 0:632c9925f013 | 360 | /* Is it the first group? */ |
| donatien | 0:632c9925f013 | 361 | if (igmp_group_list == group) { |
| donatien | 0:632c9925f013 | 362 | igmp_group_list = group->next; |
| donatien | 0:632c9925f013 | 363 | } else { |
| donatien | 0:632c9925f013 | 364 | /* look for group further down the list */ |
| donatien | 0:632c9925f013 | 365 | struct igmp_group *tmpGroup; |
| donatien | 0:632c9925f013 | 366 | for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) { |
| donatien | 0:632c9925f013 | 367 | if (tmpGroup->next == group) { |
| donatien | 0:632c9925f013 | 368 | tmpGroup->next = group->next; |
| donatien | 0:632c9925f013 | 369 | break; |
| donatien | 0:632c9925f013 | 370 | } |
| donatien | 0:632c9925f013 | 371 | } |
| donatien | 0:632c9925f013 | 372 | /* Group not found in the global igmp_group_list */ |
| donatien | 0:632c9925f013 | 373 | if (tmpGroup == NULL) |
| donatien | 0:632c9925f013 | 374 | err = ERR_ARG; |
| donatien | 0:632c9925f013 | 375 | } |
| donatien | 0:632c9925f013 | 376 | /* free group */ |
| donatien | 0:632c9925f013 | 377 | memp_free(MEMP_IGMP_GROUP, group); |
| donatien | 0:632c9925f013 | 378 | |
| donatien | 0:632c9925f013 | 379 | return err; |
| donatien | 0:632c9925f013 | 380 | } |
| donatien | 0:632c9925f013 | 381 | |
| donatien | 0:632c9925f013 | 382 | /** |
| donatien | 0:632c9925f013 | 383 | * Called from ip_input() if a new IGMP packet is received. |
| donatien | 0:632c9925f013 | 384 | * |
| donatien | 0:632c9925f013 | 385 | * @param p received igmp packet, p->payload pointing to the ip header |
| donatien | 0:632c9925f013 | 386 | * @param inp network interface on which the packet was received |
| donatien | 0:632c9925f013 | 387 | * @param dest destination ip address of the igmp packet |
| donatien | 0:632c9925f013 | 388 | */ |
| donatien | 0:632c9925f013 | 389 | void |
| donatien | 0:632c9925f013 | 390 | igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest) |
| donatien | 0:632c9925f013 | 391 | { |
| donatien | 0:632c9925f013 | 392 | struct ip_hdr * iphdr; |
| donatien | 0:632c9925f013 | 393 | struct igmp_msg* igmp; |
| donatien | 0:632c9925f013 | 394 | struct igmp_group* group; |
| donatien | 0:632c9925f013 | 395 | struct igmp_group* groupref; |
| donatien | 0:632c9925f013 | 396 | |
| donatien | 0:632c9925f013 | 397 | IGMP_STATS_INC(igmp.recv); |
| donatien | 0:632c9925f013 | 398 | |
| donatien | 0:632c9925f013 | 399 | /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */ |
| donatien | 5:dd63a1e02b1b | 400 | iphdr = (struct ip_hdr *)p->payload; |
| donatien | 0:632c9925f013 | 401 | if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) { |
| donatien | 0:632c9925f013 | 402 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 403 | IGMP_STATS_INC(igmp.lenerr); |
| donatien | 0:632c9925f013 | 404 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n")); |
| donatien | 0:632c9925f013 | 405 | return; |
| donatien | 0:632c9925f013 | 406 | } |
| donatien | 0:632c9925f013 | 407 | |
| donatien | 0:632c9925f013 | 408 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from ")); |
| donatien | 0:632c9925f013 | 409 | ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src)); |
| donatien | 0:632c9925f013 | 410 | LWIP_DEBUGF(IGMP_DEBUG, (" to address ")); |
| donatien | 0:632c9925f013 | 411 | ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest)); |
| donatien | 0:632c9925f013 | 412 | LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp)); |
| donatien | 0:632c9925f013 | 413 | |
| donatien | 0:632c9925f013 | 414 | /* Now calculate and check the checksum */ |
| donatien | 0:632c9925f013 | 415 | igmp = (struct igmp_msg *)p->payload; |
| donatien | 0:632c9925f013 | 416 | if (inet_chksum(igmp, p->len)) { |
| donatien | 0:632c9925f013 | 417 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 418 | IGMP_STATS_INC(igmp.chkerr); |
| donatien | 0:632c9925f013 | 419 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n")); |
| donatien | 0:632c9925f013 | 420 | return; |
| donatien | 0:632c9925f013 | 421 | } |
| donatien | 0:632c9925f013 | 422 | |
| donatien | 0:632c9925f013 | 423 | /* Packet is ok so find an existing group */ |
| donatien | 0:632c9925f013 | 424 | group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */ |
| donatien | 0:632c9925f013 | 425 | |
| donatien | 0:632c9925f013 | 426 | /* If group can be found or create... */ |
| donatien | 0:632c9925f013 | 427 | if (!group) { |
| donatien | 0:632c9925f013 | 428 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 429 | IGMP_STATS_INC(igmp.drop); |
| donatien | 0:632c9925f013 | 430 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n")); |
| donatien | 0:632c9925f013 | 431 | return; |
| donatien | 0:632c9925f013 | 432 | } |
| donatien | 0:632c9925f013 | 433 | |
| donatien | 0:632c9925f013 | 434 | /* NOW ACT ON THE INCOMING MESSAGE TYPE... */ |
| donatien | 0:632c9925f013 | 435 | switch (igmp->igmp_msgtype) { |
| donatien | 0:632c9925f013 | 436 | case IGMP_MEMB_QUERY: { |
| donatien | 0:632c9925f013 | 437 | /* IGMP_MEMB_QUERY to the "all systems" address ? */ |
| donatien | 0:632c9925f013 | 438 | if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) { |
| donatien | 0:632c9925f013 | 439 | /* THIS IS THE GENERAL QUERY */ |
| donatien | 0:632c9925f013 | 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))); |
| donatien | 0:632c9925f013 | 441 | |
| donatien | 0:632c9925f013 | 442 | if (igmp->igmp_maxresp == 0) { |
| donatien | 0:632c9925f013 | 443 | IGMP_STATS_INC(igmp.rx_v1); |
| donatien | 0:632c9925f013 | 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")); |
| donatien | 0:632c9925f013 | 445 | igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR; |
| donatien | 5:dd63a1e02b1b | 446 | } else { |
| donatien | 0:632c9925f013 | 447 | IGMP_STATS_INC(igmp.rx_general); |
| donatien | 0:632c9925f013 | 448 | } |
| donatien | 0:632c9925f013 | 449 | |
| donatien | 0:632c9925f013 | 450 | groupref = igmp_group_list; |
| donatien | 0:632c9925f013 | 451 | while (groupref) { |
| donatien | 0:632c9925f013 | 452 | /* Do not send messages on the all systems group address! */ |
| donatien | 0:632c9925f013 | 453 | if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) { |
| donatien | 0:632c9925f013 | 454 | igmp_delaying_member(groupref, igmp->igmp_maxresp); |
| donatien | 0:632c9925f013 | 455 | } |
| donatien | 0:632c9925f013 | 456 | groupref = groupref->next; |
| donatien | 0:632c9925f013 | 457 | } |
| donatien | 0:632c9925f013 | 458 | } else { |
| donatien | 0:632c9925f013 | 459 | /* IGMP_MEMB_QUERY to a specific group ? */ |
| donatien | 0:632c9925f013 | 460 | if (!ip_addr_isany(&igmp->igmp_group_address)) { |
| donatien | 0:632c9925f013 | 461 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group ")); |
| donatien | 0:632c9925f013 | 462 | ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address); |
| donatien | 0:632c9925f013 | 463 | if (ip_addr_cmp(dest, &allsystems)) { |
| donatien | 5:dd63a1e02b1b | 464 | ip_addr_t groupaddr; |
| donatien | 0:632c9925f013 | 465 | LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp))); |
| donatien | 5:dd63a1e02b1b | 466 | /* we first need to re-look for the group since we used dest last time */ |
| donatien | 5:dd63a1e02b1b | 467 | ip_addr_copy(groupaddr, igmp->igmp_group_address); |
| donatien | 5:dd63a1e02b1b | 468 | group = igmp_lookfor_group(inp, &groupaddr); |
| donatien | 0:632c9925f013 | 469 | } else { |
| donatien | 0:632c9925f013 | 470 | LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp))); |
| donatien | 0:632c9925f013 | 471 | } |
| donatien | 0:632c9925f013 | 472 | |
| donatien | 0:632c9925f013 | 473 | if (group != NULL) { |
| donatien | 0:632c9925f013 | 474 | IGMP_STATS_INC(igmp.rx_group); |
| donatien | 0:632c9925f013 | 475 | igmp_delaying_member(group, igmp->igmp_maxresp); |
| donatien | 5:dd63a1e02b1b | 476 | } else { |
| donatien | 0:632c9925f013 | 477 | IGMP_STATS_INC(igmp.drop); |
| donatien | 0:632c9925f013 | 478 | } |
| donatien | 5:dd63a1e02b1b | 479 | } else { |
| donatien | 0:632c9925f013 | 480 | IGMP_STATS_INC(igmp.proterr); |
| donatien | 0:632c9925f013 | 481 | } |
| donatien | 0:632c9925f013 | 482 | } |
| donatien | 0:632c9925f013 | 483 | break; |
| donatien | 0:632c9925f013 | 484 | } |
| donatien | 0:632c9925f013 | 485 | case IGMP_V2_MEMB_REPORT: { |
| donatien | 0:632c9925f013 | 486 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n")); |
| donatien | 0:632c9925f013 | 487 | IGMP_STATS_INC(igmp.rx_report); |
| donatien | 0:632c9925f013 | 488 | if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) { |
| donatien | 0:632c9925f013 | 489 | /* This is on a specific group we have already looked up */ |
| donatien | 0:632c9925f013 | 490 | group->timer = 0; /* stopped */ |
| donatien | 0:632c9925f013 | 491 | group->group_state = IGMP_GROUP_IDLE_MEMBER; |
| donatien | 0:632c9925f013 | 492 | group->last_reporter_flag = 0; |
| donatien | 0:632c9925f013 | 493 | } |
| donatien | 0:632c9925f013 | 494 | break; |
| donatien | 0:632c9925f013 | 495 | } |
| donatien | 0:632c9925f013 | 496 | default: { |
| donatien | 0:632c9925f013 | 497 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n", |
| donatien | 0:632c9925f013 | 498 | igmp->igmp_msgtype, group->group_state, &group, group->netif)); |
| donatien | 0:632c9925f013 | 499 | IGMP_STATS_INC(igmp.proterr); |
| donatien | 0:632c9925f013 | 500 | break; |
| donatien | 0:632c9925f013 | 501 | } |
| donatien | 0:632c9925f013 | 502 | } |
| donatien | 0:632c9925f013 | 503 | |
| donatien | 0:632c9925f013 | 504 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 505 | return; |
| donatien | 0:632c9925f013 | 506 | } |
| donatien | 0:632c9925f013 | 507 | |
| donatien | 0:632c9925f013 | 508 | /** |
| donatien | 0:632c9925f013 | 509 | * Join a group on one network interface. |
| donatien | 0:632c9925f013 | 510 | * |
| donatien | 0:632c9925f013 | 511 | * @param ifaddr ip address of the network interface which should join a new group |
| donatien | 0:632c9925f013 | 512 | * @param groupaddr the ip address of the group which to join |
| donatien | 0:632c9925f013 | 513 | * @return ERR_OK if group was joined on the netif(s), an err_t otherwise |
| donatien | 0:632c9925f013 | 514 | */ |
| donatien | 0:632c9925f013 | 515 | err_t |
| donatien | 0:632c9925f013 | 516 | igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr) |
| donatien | 0:632c9925f013 | 517 | { |
| donatien | 0:632c9925f013 | 518 | err_t err = ERR_VAL; /* no matching interface */ |
| donatien | 0:632c9925f013 | 519 | struct igmp_group *group; |
| donatien | 0:632c9925f013 | 520 | struct netif *netif; |
| donatien | 0:632c9925f013 | 521 | |
| donatien | 0:632c9925f013 | 522 | /* make sure it is multicast address */ |
| donatien | 0:632c9925f013 | 523 | LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;); |
| donatien | 0:632c9925f013 | 524 | LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;); |
| donatien | 0:632c9925f013 | 525 | |
| donatien | 0:632c9925f013 | 526 | /* loop through netif's */ |
| donatien | 0:632c9925f013 | 527 | netif = netif_list; |
| donatien | 0:632c9925f013 | 528 | while (netif != NULL) { |
| donatien | 0:632c9925f013 | 529 | /* Should we join this interface ? */ |
| donatien | 0:632c9925f013 | 530 | if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) { |
| donatien | 0:632c9925f013 | 531 | /* find group or create a new one if not found */ |
| donatien | 0:632c9925f013 | 532 | group = igmp_lookup_group(netif, groupaddr); |
| donatien | 0:632c9925f013 | 533 | |
| donatien | 0:632c9925f013 | 534 | if (group != NULL) { |
| donatien | 0:632c9925f013 | 535 | /* This should create a new group, check the state to make sure */ |
| donatien | 0:632c9925f013 | 536 | if (group->group_state != IGMP_GROUP_NON_MEMBER) { |
| donatien | 0:632c9925f013 | 537 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n")); |
| donatien | 0:632c9925f013 | 538 | } else { |
| donatien | 0:632c9925f013 | 539 | /* OK - it was new group */ |
| donatien | 0:632c9925f013 | 540 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: ")); |
| donatien | 0:632c9925f013 | 541 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| donatien | 0:632c9925f013 | 542 | LWIP_DEBUGF(IGMP_DEBUG, ("\n")); |
| donatien | 0:632c9925f013 | 543 | |
| donatien | 0:632c9925f013 | 544 | /* If first use of the group, allow the group at the MAC level */ |
| donatien | 0:632c9925f013 | 545 | if ((group->use==0) && (netif->igmp_mac_filter != NULL)) { |
| donatien | 0:632c9925f013 | 546 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD ")); |
| donatien | 0:632c9925f013 | 547 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| donatien | 0:632c9925f013 | 548 | LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif)); |
| donatien | 0:632c9925f013 | 549 | netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER); |
| donatien | 0:632c9925f013 | 550 | } |
| donatien | 0:632c9925f013 | 551 | |
| donatien | 0:632c9925f013 | 552 | IGMP_STATS_INC(igmp.tx_join); |
| donatien | 0:632c9925f013 | 553 | igmp_send(group, IGMP_V2_MEMB_REPORT); |
| donatien | 0:632c9925f013 | 554 | |
| donatien | 0:632c9925f013 | 555 | igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR); |
| donatien | 0:632c9925f013 | 556 | |
| donatien | 0:632c9925f013 | 557 | /* Need to work out where this timer comes from */ |
| donatien | 0:632c9925f013 | 558 | group->group_state = IGMP_GROUP_DELAYING_MEMBER; |
| donatien | 0:632c9925f013 | 559 | } |
| donatien | 0:632c9925f013 | 560 | /* Increment group use */ |
| donatien | 0:632c9925f013 | 561 | group->use++; |
| donatien | 0:632c9925f013 | 562 | /* Join on this interface */ |
| donatien | 0:632c9925f013 | 563 | err = ERR_OK; |
| donatien | 0:632c9925f013 | 564 | } else { |
| donatien | 0:632c9925f013 | 565 | /* Return an error even if some network interfaces are joined */ |
| donatien | 0:632c9925f013 | 566 | /** @todo undo any other netif already joined */ |
| donatien | 0:632c9925f013 | 567 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n")); |
| donatien | 0:632c9925f013 | 568 | return ERR_MEM; |
| donatien | 0:632c9925f013 | 569 | } |
| donatien | 0:632c9925f013 | 570 | } |
| donatien | 0:632c9925f013 | 571 | /* proceed to next network interface */ |
| donatien | 0:632c9925f013 | 572 | netif = netif->next; |
| donatien | 0:632c9925f013 | 573 | } |
| donatien | 0:632c9925f013 | 574 | |
| donatien | 0:632c9925f013 | 575 | return err; |
| donatien | 0:632c9925f013 | 576 | } |
| donatien | 0:632c9925f013 | 577 | |
| donatien | 0:632c9925f013 | 578 | /** |
| donatien | 0:632c9925f013 | 579 | * Leave a group on one network interface. |
| donatien | 0:632c9925f013 | 580 | * |
| donatien | 0:632c9925f013 | 581 | * @param ifaddr ip address of the network interface which should leave a group |
| donatien | 0:632c9925f013 | 582 | * @param groupaddr the ip address of the group which to leave |
| donatien | 0:632c9925f013 | 583 | * @return ERR_OK if group was left on the netif(s), an err_t otherwise |
| donatien | 0:632c9925f013 | 584 | */ |
| donatien | 0:632c9925f013 | 585 | err_t |
| donatien | 0:632c9925f013 | 586 | igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr) |
| donatien | 0:632c9925f013 | 587 | { |
| donatien | 0:632c9925f013 | 588 | err_t err = ERR_VAL; /* no matching interface */ |
| donatien | 0:632c9925f013 | 589 | struct igmp_group *group; |
| donatien | 0:632c9925f013 | 590 | struct netif *netif; |
| donatien | 0:632c9925f013 | 591 | |
| donatien | 0:632c9925f013 | 592 | /* make sure it is multicast address */ |
| donatien | 0:632c9925f013 | 593 | LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;); |
| donatien | 0:632c9925f013 | 594 | LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;); |
| donatien | 0:632c9925f013 | 595 | |
| donatien | 0:632c9925f013 | 596 | /* loop through netif's */ |
| donatien | 0:632c9925f013 | 597 | netif = netif_list; |
| donatien | 0:632c9925f013 | 598 | while (netif != NULL) { |
| donatien | 0:632c9925f013 | 599 | /* Should we leave this interface ? */ |
| donatien | 0:632c9925f013 | 600 | if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) { |
| donatien | 0:632c9925f013 | 601 | /* find group */ |
| donatien | 0:632c9925f013 | 602 | group = igmp_lookfor_group(netif, groupaddr); |
| donatien | 0:632c9925f013 | 603 | |
| donatien | 0:632c9925f013 | 604 | if (group != NULL) { |
| donatien | 0:632c9925f013 | 605 | /* Only send a leave if the flag is set according to the state diagram */ |
| donatien | 0:632c9925f013 | 606 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: ")); |
| donatien | 0:632c9925f013 | 607 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| donatien | 0:632c9925f013 | 608 | LWIP_DEBUGF(IGMP_DEBUG, ("\n")); |
| donatien | 0:632c9925f013 | 609 | |
| donatien | 0:632c9925f013 | 610 | /* If there is no other use of the group */ |
| donatien | 0:632c9925f013 | 611 | if (group->use <= 1) { |
| donatien | 0:632c9925f013 | 612 | /* If we are the last reporter for this group */ |
| donatien | 0:632c9925f013 | 613 | if (group->last_reporter_flag) { |
| donatien | 0:632c9925f013 | 614 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n")); |
| donatien | 0:632c9925f013 | 615 | IGMP_STATS_INC(igmp.tx_leave); |
| donatien | 0:632c9925f013 | 616 | igmp_send(group, IGMP_LEAVE_GROUP); |
| donatien | 0:632c9925f013 | 617 | } |
| donatien | 0:632c9925f013 | 618 | |
| donatien | 0:632c9925f013 | 619 | /* Disable the group at the MAC level */ |
| donatien | 0:632c9925f013 | 620 | if (netif->igmp_mac_filter != NULL) { |
| donatien | 0:632c9925f013 | 621 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL ")); |
| donatien | 0:632c9925f013 | 622 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| donatien | 0:632c9925f013 | 623 | LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif)); |
| donatien | 0:632c9925f013 | 624 | netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER); |
| donatien | 0:632c9925f013 | 625 | } |
| donatien | 0:632c9925f013 | 626 | |
| donatien | 0:632c9925f013 | 627 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: ")); |
| donatien | 0:632c9925f013 | 628 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| donatien | 0:632c9925f013 | 629 | LWIP_DEBUGF(IGMP_DEBUG, ("\n")); |
| donatien | 0:632c9925f013 | 630 | |
| donatien | 0:632c9925f013 | 631 | /* Free the group */ |
| donatien | 0:632c9925f013 | 632 | igmp_remove_group(group); |
| donatien | 0:632c9925f013 | 633 | } else { |
| donatien | 0:632c9925f013 | 634 | /* Decrement group use */ |
| donatien | 0:632c9925f013 | 635 | group->use--; |
| donatien | 0:632c9925f013 | 636 | } |
| donatien | 0:632c9925f013 | 637 | /* Leave on this interface */ |
| donatien | 0:632c9925f013 | 638 | err = ERR_OK; |
| donatien | 0:632c9925f013 | 639 | } else { |
| donatien | 0:632c9925f013 | 640 | /* It's not a fatal error on "leavegroup" */ |
| donatien | 0:632c9925f013 | 641 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n")); |
| donatien | 0:632c9925f013 | 642 | } |
| donatien | 0:632c9925f013 | 643 | } |
| donatien | 0:632c9925f013 | 644 | /* proceed to next network interface */ |
| donatien | 0:632c9925f013 | 645 | netif = netif->next; |
| donatien | 0:632c9925f013 | 646 | } |
| donatien | 0:632c9925f013 | 647 | |
| donatien | 0:632c9925f013 | 648 | return err; |
| donatien | 0:632c9925f013 | 649 | } |
| donatien | 0:632c9925f013 | 650 | |
| donatien | 0:632c9925f013 | 651 | /** |
| donatien | 0:632c9925f013 | 652 | * The igmp timer function (both for NO_SYS=1 and =0) |
| donatien | 0:632c9925f013 | 653 | * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default). |
| donatien | 0:632c9925f013 | 654 | */ |
| donatien | 0:632c9925f013 | 655 | void |
| donatien | 0:632c9925f013 | 656 | igmp_tmr(void) |
| donatien | 0:632c9925f013 | 657 | { |
| donatien | 0:632c9925f013 | 658 | struct igmp_group *group = igmp_group_list; |
| donatien | 0:632c9925f013 | 659 | |
| donatien | 0:632c9925f013 | 660 | while (group != NULL) { |
| donatien | 0:632c9925f013 | 661 | if (group->timer > 0) { |
| donatien | 0:632c9925f013 | 662 | group->timer--; |
| donatien | 0:632c9925f013 | 663 | if (group->timer == 0) { |
| donatien | 0:632c9925f013 | 664 | igmp_timeout(group); |
| donatien | 0:632c9925f013 | 665 | } |
| donatien | 0:632c9925f013 | 666 | } |
| donatien | 0:632c9925f013 | 667 | group = group->next; |
| donatien | 0:632c9925f013 | 668 | } |
| donatien | 0:632c9925f013 | 669 | } |
| donatien | 0:632c9925f013 | 670 | |
| donatien | 0:632c9925f013 | 671 | /** |
| donatien | 0:632c9925f013 | 672 | * Called if a timeout for one group is reached. |
| donatien | 0:632c9925f013 | 673 | * Sends a report for this group. |
| donatien | 0:632c9925f013 | 674 | * |
| donatien | 0:632c9925f013 | 675 | * @param group an igmp_group for which a timeout is reached |
| donatien | 0:632c9925f013 | 676 | */ |
| donatien | 0:632c9925f013 | 677 | static void |
| donatien | 0:632c9925f013 | 678 | igmp_timeout(struct igmp_group *group) |
| donatien | 0:632c9925f013 | 679 | { |
| donatien | 0:632c9925f013 | 680 | /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */ |
| donatien | 0:632c9925f013 | 681 | if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) { |
| donatien | 0:632c9925f013 | 682 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address ")); |
| donatien | 0:632c9925f013 | 683 | ip_addr_debug_print(IGMP_DEBUG, &(group->group_address)); |
| donatien | 0:632c9925f013 | 684 | LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif)); |
| donatien | 0:632c9925f013 | 685 | |
| donatien | 0:632c9925f013 | 686 | IGMP_STATS_INC(igmp.tx_report); |
| donatien | 0:632c9925f013 | 687 | igmp_send(group, IGMP_V2_MEMB_REPORT); |
| donatien | 0:632c9925f013 | 688 | } |
| donatien | 0:632c9925f013 | 689 | } |
| donatien | 0:632c9925f013 | 690 | |
| donatien | 0:632c9925f013 | 691 | /** |
| donatien | 0:632c9925f013 | 692 | * Start a timer for an igmp group |
| donatien | 0:632c9925f013 | 693 | * |
| donatien | 0:632c9925f013 | 694 | * @param group the igmp_group for which to start a timer |
| donatien | 0:632c9925f013 | 695 | * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with |
| donatien | 0:632c9925f013 | 696 | * every call to igmp_tmr()) |
| donatien | 0:632c9925f013 | 697 | */ |
| donatien | 0:632c9925f013 | 698 | static void |
| donatien | 0:632c9925f013 | 699 | igmp_start_timer(struct igmp_group *group, u8_t max_time) |
| donatien | 0:632c9925f013 | 700 | { |
| donatien | 0:632c9925f013 | 701 | /* ensure the input value is > 0 */ |
| donatien | 0:632c9925f013 | 702 | if (max_time == 0) { |
| donatien | 0:632c9925f013 | 703 | max_time = 1; |
| donatien | 0:632c9925f013 | 704 | } |
| donatien | 0:632c9925f013 | 705 | /* ensure the random value is > 0 */ |
| donatien | 0:632c9925f013 | 706 | group->timer = (LWIP_RAND() % (max_time - 1)) + 1; |
| donatien | 0:632c9925f013 | 707 | } |
| donatien | 0:632c9925f013 | 708 | |
| donatien | 0:632c9925f013 | 709 | /** |
| donatien | 0:632c9925f013 | 710 | * Stop a timer for an igmp_group |
| donatien | 0:632c9925f013 | 711 | * |
| donatien | 0:632c9925f013 | 712 | * @param group the igmp_group for which to stop the timer |
| donatien | 0:632c9925f013 | 713 | */ |
| donatien | 0:632c9925f013 | 714 | static void |
| donatien | 0:632c9925f013 | 715 | igmp_stop_timer(struct igmp_group *group) |
| donatien | 0:632c9925f013 | 716 | { |
| donatien | 5:dd63a1e02b1b | 717 | group->timer = 0; |
| donatien | 0:632c9925f013 | 718 | } |
| donatien | 0:632c9925f013 | 719 | |
| donatien | 0:632c9925f013 | 720 | /** |
| donatien | 0:632c9925f013 | 721 | * Delaying membership report for a group if necessary |
| donatien | 0:632c9925f013 | 722 | * |
| donatien | 0:632c9925f013 | 723 | * @param group the igmp_group for which "delaying" membership report |
| donatien | 0:632c9925f013 | 724 | * @param maxresp query delay |
| donatien | 0:632c9925f013 | 725 | */ |
| donatien | 0:632c9925f013 | 726 | static void |
| donatien | 0:632c9925f013 | 727 | igmp_delaying_member(struct igmp_group *group, u8_t maxresp) |
| donatien | 0:632c9925f013 | 728 | { |
| donatien | 0:632c9925f013 | 729 | if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) || |
| donatien | 0:632c9925f013 | 730 | ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) && |
| donatien | 0:632c9925f013 | 731 | ((group->timer == 0) || (maxresp < group->timer)))) { |
| donatien | 0:632c9925f013 | 732 | igmp_start_timer(group, maxresp); |
| donatien | 0:632c9925f013 | 733 | group->group_state = IGMP_GROUP_DELAYING_MEMBER; |
| donatien | 0:632c9925f013 | 734 | } |
| donatien | 0:632c9925f013 | 735 | } |
| donatien | 0:632c9925f013 | 736 | |
| donatien | 0:632c9925f013 | 737 | |
| donatien | 0:632c9925f013 | 738 | /** |
| donatien | 0:632c9925f013 | 739 | * Sends an IP packet on a network interface. This function constructs the IP header |
| donatien | 0:632c9925f013 | 740 | * and calculates the IP header checksum. If the source IP address is NULL, |
| donatien | 0:632c9925f013 | 741 | * the IP address of the outgoing network interface is filled in as source address. |
| donatien | 0:632c9925f013 | 742 | * |
| donatien | 0:632c9925f013 | 743 | * @param p the packet to send (p->payload points to the data, e.g. next |
| donatien | 0:632c9925f013 | 744 | protocol header; if dest == IP_HDRINCL, p already includes an IP |
| donatien | 0:632c9925f013 | 745 | header and p->payload points to that IP header) |
| donatien | 0:632c9925f013 | 746 | * @param src the source IP address to send from (if src == IP_ADDR_ANY, the |
| donatien | 0:632c9925f013 | 747 | * IP address of the netif used to send is used as source address) |
| donatien | 0:632c9925f013 | 748 | * @param dest the destination IP address to send the packet to |
| donatien | 0:632c9925f013 | 749 | * @param ttl the TTL value to be set in the IP header |
| donatien | 0:632c9925f013 | 750 | * @param proto the PROTOCOL to be set in the IP header |
| donatien | 0:632c9925f013 | 751 | * @param netif the netif on which to send this packet |
| donatien | 0:632c9925f013 | 752 | * @return ERR_OK if the packet was sent OK |
| donatien | 0:632c9925f013 | 753 | * ERR_BUF if p doesn't have enough space for IP/LINK headers |
| donatien | 0:632c9925f013 | 754 | * returns errors returned by netif->output |
| donatien | 0:632c9925f013 | 755 | */ |
| donatien | 0:632c9925f013 | 756 | static err_t |
| donatien | 0:632c9925f013 | 757 | igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif) |
| donatien | 0:632c9925f013 | 758 | { |
| donatien | 0:632c9925f013 | 759 | /* This is the "router alert" option */ |
| donatien | 0:632c9925f013 | 760 | u16_t ra[2]; |
| donatien | 5:dd63a1e02b1b | 761 | ra[0] = PP_HTONS(ROUTER_ALERT); |
| donatien | 0:632c9925f013 | 762 | ra[1] = 0x0000; /* Router shall examine packet */ |
| donatien | 0:632c9925f013 | 763 | IGMP_STATS_INC(igmp.xmit); |
| donatien | 0:632c9925f013 | 764 | return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN); |
| donatien | 0:632c9925f013 | 765 | } |
| donatien | 0:632c9925f013 | 766 | |
| donatien | 0:632c9925f013 | 767 | /** |
| donatien | 0:632c9925f013 | 768 | * Send an igmp packet to a specific group. |
| donatien | 0:632c9925f013 | 769 | * |
| donatien | 0:632c9925f013 | 770 | * @param group the group to which to send the packet |
| donatien | 0:632c9925f013 | 771 | * @param type the type of igmp packet to send |
| donatien | 0:632c9925f013 | 772 | */ |
| donatien | 0:632c9925f013 | 773 | static void |
| donatien | 0:632c9925f013 | 774 | igmp_send(struct igmp_group *group, u8_t type) |
| donatien | 0:632c9925f013 | 775 | { |
| donatien | 0:632c9925f013 | 776 | struct pbuf* p = NULL; |
| donatien | 0:632c9925f013 | 777 | struct igmp_msg* igmp = NULL; |
| donatien | 0:632c9925f013 | 778 | ip_addr_t src = *IP_ADDR_ANY; |
| donatien | 0:632c9925f013 | 779 | ip_addr_t* dest = NULL; |
| donatien | 0:632c9925f013 | 780 | |
| donatien | 0:632c9925f013 | 781 | /* IP header + "router alert" option + IGMP header */ |
| donatien | 0:632c9925f013 | 782 | p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM); |
| donatien | 0:632c9925f013 | 783 | |
| donatien | 0:632c9925f013 | 784 | if (p) { |
| donatien | 5:dd63a1e02b1b | 785 | igmp = (struct igmp_msg *)p->payload; |
| donatien | 0:632c9925f013 | 786 | LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg", |
| donatien | 0:632c9925f013 | 787 | (p->len >= sizeof(struct igmp_msg))); |
| donatien | 0:632c9925f013 | 788 | ip_addr_copy(src, group->netif->ip_addr); |
| donatien | 0:632c9925f013 | 789 | |
| donatien | 0:632c9925f013 | 790 | if (type == IGMP_V2_MEMB_REPORT) { |
| donatien | 0:632c9925f013 | 791 | dest = &(group->group_address); |
| donatien | 0:632c9925f013 | 792 | ip_addr_copy(igmp->igmp_group_address, group->group_address); |
| donatien | 0:632c9925f013 | 793 | group->last_reporter_flag = 1; /* Remember we were the last to report */ |
| donatien | 0:632c9925f013 | 794 | } else { |
| donatien | 0:632c9925f013 | 795 | if (type == IGMP_LEAVE_GROUP) { |
| donatien | 0:632c9925f013 | 796 | dest = &allrouters; |
| donatien | 0:632c9925f013 | 797 | ip_addr_copy(igmp->igmp_group_address, group->group_address); |
| donatien | 0:632c9925f013 | 798 | } |
| donatien | 0:632c9925f013 | 799 | } |
| donatien | 0:632c9925f013 | 800 | |
| donatien | 0:632c9925f013 | 801 | if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) { |
| donatien | 0:632c9925f013 | 802 | igmp->igmp_msgtype = type; |
| donatien | 0:632c9925f013 | 803 | igmp->igmp_maxresp = 0; |
| donatien | 0:632c9925f013 | 804 | igmp->igmp_checksum = 0; |
| donatien | 0:632c9925f013 | 805 | igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN); |
| donatien | 0:632c9925f013 | 806 | |
| donatien | 0:632c9925f013 | 807 | igmp_ip_output_if(p, &src, dest, group->netif); |
| donatien | 0:632c9925f013 | 808 | } |
| donatien | 0:632c9925f013 | 809 | |
| donatien | 0:632c9925f013 | 810 | pbuf_free(p); |
| donatien | 0:632c9925f013 | 811 | } else { |
| donatien | 0:632c9925f013 | 812 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n")); |
| donatien | 0:632c9925f013 | 813 | IGMP_STATS_INC(igmp.memerr); |
| donatien | 0:632c9925f013 | 814 | } |
| donatien | 0:632c9925f013 | 815 | } |
| donatien | 0:632c9925f013 | 816 | |
| donatien | 0:632c9925f013 | 817 | #endif /* LWIP_IGMP */ |