Pehr Hovey
Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
Core/lwIP/core/ipv4/igmp.c@0:a548a085de55, 2010-03-14 (annotated)
- Committer:
- pehrhovey
- Date:
- Sun Mar 14 00:54:12 2010 +0000
- Revision:
- 0:a548a085de55
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| pehrhovey | 0:a548a085de55 | 1 | /** |
| pehrhovey | 0:a548a085de55 | 2 | * @file |
| pehrhovey | 0:a548a085de55 | 3 | * IGMP - Internet Group Management Protocol |
| pehrhovey | 0:a548a085de55 | 4 | * |
| pehrhovey | 0:a548a085de55 | 5 | */ |
| pehrhovey | 0:a548a085de55 | 6 | |
| pehrhovey | 0:a548a085de55 | 7 | /* |
| pehrhovey | 0:a548a085de55 | 8 | * Copyright (c) 2002 CITEL Technologies Ltd. |
| pehrhovey | 0:a548a085de55 | 9 | * All rights reserved. |
| pehrhovey | 0:a548a085de55 | 10 | * |
| pehrhovey | 0:a548a085de55 | 11 | * Redistribution and use in source and binary forms, with or without |
| pehrhovey | 0:a548a085de55 | 12 | * modification, are permitted provided that the following conditions |
| pehrhovey | 0:a548a085de55 | 13 | * are met: |
| pehrhovey | 0:a548a085de55 | 14 | * 1. Redistributions of source code must retain the above copyright |
| pehrhovey | 0:a548a085de55 | 15 | * notice, this list of conditions and the following disclaimer. |
| pehrhovey | 0:a548a085de55 | 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| pehrhovey | 0:a548a085de55 | 17 | * notice, this list of conditions and the following disclaimer in the |
| pehrhovey | 0:a548a085de55 | 18 | * documentation and/or other materials provided with the distribution. |
| pehrhovey | 0:a548a085de55 | 19 | * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors |
| pehrhovey | 0:a548a085de55 | 20 | * may be used to endorse or promote products derived from this software |
| pehrhovey | 0:a548a085de55 | 21 | * without specific prior written permission. |
| pehrhovey | 0:a548a085de55 | 22 | * |
| pehrhovey | 0:a548a085de55 | 23 | * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS'' |
| pehrhovey | 0:a548a085de55 | 24 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| pehrhovey | 0:a548a085de55 | 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| pehrhovey | 0:a548a085de55 | 26 | * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE |
| pehrhovey | 0:a548a085de55 | 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| pehrhovey | 0:a548a085de55 | 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| pehrhovey | 0:a548a085de55 | 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| pehrhovey | 0:a548a085de55 | 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| pehrhovey | 0:a548a085de55 | 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| pehrhovey | 0:a548a085de55 | 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| pehrhovey | 0:a548a085de55 | 33 | * SUCH DAMAGE. |
| pehrhovey | 0:a548a085de55 | 34 | * |
| pehrhovey | 0:a548a085de55 | 35 | * This file is a contribution to the lwIP TCP/IP stack. |
| pehrhovey | 0:a548a085de55 | 36 | * The Swedish Institute of Computer Science and Adam Dunkels |
| pehrhovey | 0:a548a085de55 | 37 | * are specifically granted permission to redistribute this |
| pehrhovey | 0:a548a085de55 | 38 | * source code. |
| pehrhovey | 0:a548a085de55 | 39 | */ |
| pehrhovey | 0:a548a085de55 | 40 | |
| pehrhovey | 0:a548a085de55 | 41 | /*------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 42 | Note 1) |
| pehrhovey | 0:a548a085de55 | 43 | Although the rfc requires V1 AND V2 capability |
| pehrhovey | 0:a548a085de55 | 44 | we will only support v2 since now V1 is very old (August 1989) |
| pehrhovey | 0:a548a085de55 | 45 | V1 can be added if required |
| pehrhovey | 0:a548a085de55 | 46 | |
| pehrhovey | 0:a548a085de55 | 47 | a debug print and statistic have been implemented to |
| pehrhovey | 0:a548a085de55 | 48 | show this up. |
| pehrhovey | 0:a548a085de55 | 49 | ------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 50 | ------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 51 | Note 2) |
| pehrhovey | 0:a548a085de55 | 52 | A query for a specific group address (as opposed to ALLHOSTS) |
| pehrhovey | 0:a548a085de55 | 53 | has now been implemented as I am unsure if it is required |
| pehrhovey | 0:a548a085de55 | 54 | |
| pehrhovey | 0:a548a085de55 | 55 | a debug print and statistic have been implemented to |
| pehrhovey | 0:a548a085de55 | 56 | show this up. |
| pehrhovey | 0:a548a085de55 | 57 | ------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 58 | ------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 59 | Note 3) |
| pehrhovey | 0:a548a085de55 | 60 | The router alert rfc 2113 is implemented in outgoing packets |
| pehrhovey | 0:a548a085de55 | 61 | but not checked rigorously incoming |
| pehrhovey | 0:a548a085de55 | 62 | ------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 63 | Steve Reynolds |
| pehrhovey | 0:a548a085de55 | 64 | ------------------------------------------------------------*/ |
| pehrhovey | 0:a548a085de55 | 65 | |
| pehrhovey | 0:a548a085de55 | 66 | /*----------------------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 67 | * RFC 988 - Host extensions for IP multicasting - V0 |
| pehrhovey | 0:a548a085de55 | 68 | * RFC 1054 - Host extensions for IP multicasting - |
| pehrhovey | 0:a548a085de55 | 69 | * RFC 1112 - Host extensions for IP multicasting - V1 |
| pehrhovey | 0:a548a085de55 | 70 | * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard) |
| pehrhovey | 0:a548a085de55 | 71 | * RFC 3376 - Internet Group Management Protocol, Version 3 - V3 |
| pehrhovey | 0:a548a085de55 | 72 | * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+ |
| pehrhovey | 0:a548a085de55 | 73 | * RFC 2113 - IP Router Alert Option - |
| pehrhovey | 0:a548a085de55 | 74 | *----------------------------------------------------------------------------*/ |
| pehrhovey | 0:a548a085de55 | 75 | |
| pehrhovey | 0:a548a085de55 | 76 | /*----------------------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 77 | * Includes |
| pehrhovey | 0:a548a085de55 | 78 | *----------------------------------------------------------------------------*/ |
| pehrhovey | 0:a548a085de55 | 79 | |
| pehrhovey | 0:a548a085de55 | 80 | #include "lwip/opt.h" |
| pehrhovey | 0:a548a085de55 | 81 | |
| pehrhovey | 0:a548a085de55 | 82 | #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */ |
| pehrhovey | 0:a548a085de55 | 83 | |
| pehrhovey | 0:a548a085de55 | 84 | #include "lwip/igmp.h" |
| pehrhovey | 0:a548a085de55 | 85 | #include "lwip/debug.h" |
| pehrhovey | 0:a548a085de55 | 86 | #include "lwip/def.h" |
| pehrhovey | 0:a548a085de55 | 87 | #include "lwip/mem.h" |
| pehrhovey | 0:a548a085de55 | 88 | #include "lwip/ip.h" |
| pehrhovey | 0:a548a085de55 | 89 | #include "lwip/inet.h" |
| pehrhovey | 0:a548a085de55 | 90 | #include "lwip/inet_chksum.h" |
| pehrhovey | 0:a548a085de55 | 91 | #include "lwip/netif.h" |
| pehrhovey | 0:a548a085de55 | 92 | #include "lwip/icmp.h" |
| pehrhovey | 0:a548a085de55 | 93 | #include "lwip/udp.h" |
| pehrhovey | 0:a548a085de55 | 94 | #include "lwip/tcp.h" |
| pehrhovey | 0:a548a085de55 | 95 | #include "lwip/stats.h" |
| pehrhovey | 0:a548a085de55 | 96 | |
| pehrhovey | 0:a548a085de55 | 97 | #include "string.h" |
| pehrhovey | 0:a548a085de55 | 98 | |
| pehrhovey | 0:a548a085de55 | 99 | /*----------------------------------------------------------------------------- |
| pehrhovey | 0:a548a085de55 | 100 | * Globales |
| pehrhovey | 0:a548a085de55 | 101 | *----------------------------------------------------------------------------*/ |
| pehrhovey | 0:a548a085de55 | 102 | |
| pehrhovey | 0:a548a085de55 | 103 | static struct igmp_group* igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 104 | static struct ip_addr allsystems; |
| pehrhovey | 0:a548a085de55 | 105 | static struct ip_addr allrouters; |
| pehrhovey | 0:a548a085de55 | 106 | |
| pehrhovey | 0:a548a085de55 | 107 | /** |
| pehrhovey | 0:a548a085de55 | 108 | * Initialize the IGMP module |
| pehrhovey | 0:a548a085de55 | 109 | */ |
| pehrhovey | 0:a548a085de55 | 110 | void |
| pehrhovey | 0:a548a085de55 | 111 | igmp_init(void) |
| pehrhovey | 0:a548a085de55 | 112 | { |
| pehrhovey | 0:a548a085de55 | 113 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n")); |
| pehrhovey | 0:a548a085de55 | 114 | |
| pehrhovey | 0:a548a085de55 | 115 | IP4_ADDR(&allsystems, 224, 0, 0, 1); |
| pehrhovey | 0:a548a085de55 | 116 | IP4_ADDR(&allrouters, 224, 0, 0, 2); |
| pehrhovey | 0:a548a085de55 | 117 | } |
| pehrhovey | 0:a548a085de55 | 118 | |
| pehrhovey | 0:a548a085de55 | 119 | #ifdef LWIP_DEBUG |
| pehrhovey | 0:a548a085de55 | 120 | /** |
| pehrhovey | 0:a548a085de55 | 121 | * Dump global IGMP groups list |
| pehrhovey | 0:a548a085de55 | 122 | */ |
| pehrhovey | 0:a548a085de55 | 123 | void |
| pehrhovey | 0:a548a085de55 | 124 | igmp_dump_group_list() |
| pehrhovey | 0:a548a085de55 | 125 | { |
| pehrhovey | 0:a548a085de55 | 126 | struct igmp_group *group = igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 127 | |
| pehrhovey | 0:a548a085de55 | 128 | while (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 129 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state))); |
| pehrhovey | 0:a548a085de55 | 130 | ip_addr_debug_print(IGMP_DEBUG, &group->group_address); |
| pehrhovey | 0:a548a085de55 | 131 | LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->interface)); |
| pehrhovey | 0:a548a085de55 | 132 | group = group->next; |
| pehrhovey | 0:a548a085de55 | 133 | } |
| pehrhovey | 0:a548a085de55 | 134 | LWIP_DEBUGF(IGMP_DEBUG, ("\n")); |
| pehrhovey | 0:a548a085de55 | 135 | } |
| pehrhovey | 0:a548a085de55 | 136 | #else |
| pehrhovey | 0:a548a085de55 | 137 | #define igmp_dump_group_list() |
| pehrhovey | 0:a548a085de55 | 138 | #endif /* LWIP_DEBUG */ |
| pehrhovey | 0:a548a085de55 | 139 | |
| pehrhovey | 0:a548a085de55 | 140 | /** |
| pehrhovey | 0:a548a085de55 | 141 | * Start IGMP processing on interface |
| pehrhovey | 0:a548a085de55 | 142 | * |
| pehrhovey | 0:a548a085de55 | 143 | * @param netif network interface on which start IGMP processing |
| pehrhovey | 0:a548a085de55 | 144 | */ |
| pehrhovey | 0:a548a085de55 | 145 | err_t |
| pehrhovey | 0:a548a085de55 | 146 | igmp_start(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 147 | { |
| pehrhovey | 0:a548a085de55 | 148 | struct igmp_group* group; |
| pehrhovey | 0:a548a085de55 | 149 | |
| pehrhovey | 0:a548a085de55 | 150 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif)); |
| pehrhovey | 0:a548a085de55 | 151 | |
| pehrhovey | 0:a548a085de55 | 152 | group = igmp_lookup_group(netif, &allsystems); |
| pehrhovey | 0:a548a085de55 | 153 | |
| pehrhovey | 0:a548a085de55 | 154 | if (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 155 | group->group_state = IGMP_GROUP_IDLE_MEMBER; |
| pehrhovey | 0:a548a085de55 | 156 | group->use++; |
| pehrhovey | 0:a548a085de55 | 157 | |
| pehrhovey | 0:a548a085de55 | 158 | /* Allow the igmp messages at the MAC level */ |
| pehrhovey | 0:a548a085de55 | 159 | if (netif->igmp_mac_filter != NULL) { |
| pehrhovey | 0:a548a085de55 | 160 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD ")); |
| pehrhovey | 0:a548a085de55 | 161 | ip_addr_debug_print(IGMP_DEBUG, &allsystems); |
| pehrhovey | 0:a548a085de55 | 162 | LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif)); |
| pehrhovey | 0:a548a085de55 | 163 | netif->igmp_mac_filter( netif, &allsystems, IGMP_ADD_MAC_FILTER); |
| pehrhovey | 0:a548a085de55 | 164 | } |
| pehrhovey | 0:a548a085de55 | 165 | |
| pehrhovey | 0:a548a085de55 | 166 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 167 | } |
| pehrhovey | 0:a548a085de55 | 168 | |
| pehrhovey | 0:a548a085de55 | 169 | return ERR_MEM; |
| pehrhovey | 0:a548a085de55 | 170 | } |
| pehrhovey | 0:a548a085de55 | 171 | |
| pehrhovey | 0:a548a085de55 | 172 | /** |
| pehrhovey | 0:a548a085de55 | 173 | * Stop IGMP processing on interface |
| pehrhovey | 0:a548a085de55 | 174 | * |
| pehrhovey | 0:a548a085de55 | 175 | * @param netif network interface on which stop IGMP processing |
| pehrhovey | 0:a548a085de55 | 176 | */ |
| pehrhovey | 0:a548a085de55 | 177 | err_t |
| pehrhovey | 0:a548a085de55 | 178 | igmp_stop(struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 179 | { |
| pehrhovey | 0:a548a085de55 | 180 | struct igmp_group *group = igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 181 | struct igmp_group *prev = NULL; |
| pehrhovey | 0:a548a085de55 | 182 | struct igmp_group *next; |
| pehrhovey | 0:a548a085de55 | 183 | |
| pehrhovey | 0:a548a085de55 | 184 | /* look for groups joined on this interface further down the list */ |
| pehrhovey | 0:a548a085de55 | 185 | while (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 186 | next = group->next; |
| pehrhovey | 0:a548a085de55 | 187 | /* is it a group joined on this interface? */ |
| pehrhovey | 0:a548a085de55 | 188 | if (group->interface == netif) { |
| pehrhovey | 0:a548a085de55 | 189 | /* is it the first group of the list? */ |
| pehrhovey | 0:a548a085de55 | 190 | if (group == igmp_group_list) { |
| pehrhovey | 0:a548a085de55 | 191 | igmp_group_list = next; |
| pehrhovey | 0:a548a085de55 | 192 | } |
| pehrhovey | 0:a548a085de55 | 193 | /* is there a "previous" group defined? */ |
| pehrhovey | 0:a548a085de55 | 194 | if (prev != NULL) { |
| pehrhovey | 0:a548a085de55 | 195 | prev->next = next; |
| pehrhovey | 0:a548a085de55 | 196 | } |
| pehrhovey | 0:a548a085de55 | 197 | /* disable the group at the MAC level */ |
| pehrhovey | 0:a548a085de55 | 198 | if (netif->igmp_mac_filter != NULL) { |
| pehrhovey | 0:a548a085de55 | 199 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL ")); |
| pehrhovey | 0:a548a085de55 | 200 | ip_addr_debug_print(IGMP_DEBUG, &group->group_address); |
| pehrhovey | 0:a548a085de55 | 201 | LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif)); |
| pehrhovey | 0:a548a085de55 | 202 | netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER); |
| pehrhovey | 0:a548a085de55 | 203 | } |
| pehrhovey | 0:a548a085de55 | 204 | /* free group */ |
| pehrhovey | 0:a548a085de55 | 205 | memp_free(MEMP_IGMP_GROUP, group); |
| pehrhovey | 0:a548a085de55 | 206 | } else { |
| pehrhovey | 0:a548a085de55 | 207 | /* change the "previous" */ |
| pehrhovey | 0:a548a085de55 | 208 | prev = group; |
| pehrhovey | 0:a548a085de55 | 209 | } |
| pehrhovey | 0:a548a085de55 | 210 | /* move to "next" */ |
| pehrhovey | 0:a548a085de55 | 211 | group = next; |
| pehrhovey | 0:a548a085de55 | 212 | } |
| pehrhovey | 0:a548a085de55 | 213 | return ERR_OK; |
| pehrhovey | 0:a548a085de55 | 214 | } |
| pehrhovey | 0:a548a085de55 | 215 | |
| pehrhovey | 0:a548a085de55 | 216 | /** |
| pehrhovey | 0:a548a085de55 | 217 | * Report IGMP memberships for this interface |
| pehrhovey | 0:a548a085de55 | 218 | * |
| pehrhovey | 0:a548a085de55 | 219 | * @param netif network interface on which report IGMP memberships |
| pehrhovey | 0:a548a085de55 | 220 | */ |
| pehrhovey | 0:a548a085de55 | 221 | void |
| pehrhovey | 0:a548a085de55 | 222 | igmp_report_groups( struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 223 | { |
| pehrhovey | 0:a548a085de55 | 224 | struct igmp_group *group = igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 225 | |
| pehrhovey | 0:a548a085de55 | 226 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif)); |
| pehrhovey | 0:a548a085de55 | 227 | |
| pehrhovey | 0:a548a085de55 | 228 | while (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 229 | if (group->interface == netif) { |
| pehrhovey | 0:a548a085de55 | 230 | igmp_delaying_member( group, IGMP_JOIN_DELAYING_MEMBER_TMR); |
| pehrhovey | 0:a548a085de55 | 231 | } |
| pehrhovey | 0:a548a085de55 | 232 | group = group->next; |
| pehrhovey | 0:a548a085de55 | 233 | } |
| pehrhovey | 0:a548a085de55 | 234 | } |
| pehrhovey | 0:a548a085de55 | 235 | |
| pehrhovey | 0:a548a085de55 | 236 | /** |
| pehrhovey | 0:a548a085de55 | 237 | * Search for a group in the global igmp_group_list |
| pehrhovey | 0:a548a085de55 | 238 | * |
| pehrhovey | 0:a548a085de55 | 239 | * @param ifp the network interface for which to look |
| pehrhovey | 0:a548a085de55 | 240 | * @param addr the group ip address to search for |
| pehrhovey | 0:a548a085de55 | 241 | * @return a struct igmp_group* if the group has been found, |
| pehrhovey | 0:a548a085de55 | 242 | * NULL if the group wasn't found. |
| pehrhovey | 0:a548a085de55 | 243 | */ |
| pehrhovey | 0:a548a085de55 | 244 | struct igmp_group * |
| pehrhovey | 0:a548a085de55 | 245 | igmp_lookfor_group(struct netif *ifp, struct ip_addr *addr) |
| pehrhovey | 0:a548a085de55 | 246 | { |
| pehrhovey | 0:a548a085de55 | 247 | struct igmp_group *group = igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 248 | |
| pehrhovey | 0:a548a085de55 | 249 | while (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 250 | if ((group->interface == ifp) && (ip_addr_cmp(&(group->group_address), addr))) { |
| pehrhovey | 0:a548a085de55 | 251 | return group; |
| pehrhovey | 0:a548a085de55 | 252 | } |
| pehrhovey | 0:a548a085de55 | 253 | group = group->next; |
| pehrhovey | 0:a548a085de55 | 254 | } |
| pehrhovey | 0:a548a085de55 | 255 | |
| pehrhovey | 0:a548a085de55 | 256 | /* to be clearer, we return NULL here instead of |
| pehrhovey | 0:a548a085de55 | 257 | * 'group' (which is also NULL at this point). |
| pehrhovey | 0:a548a085de55 | 258 | */ |
| pehrhovey | 0:a548a085de55 | 259 | return NULL; |
| pehrhovey | 0:a548a085de55 | 260 | } |
| pehrhovey | 0:a548a085de55 | 261 | |
| pehrhovey | 0:a548a085de55 | 262 | /** |
| pehrhovey | 0:a548a085de55 | 263 | * Search for a specific igmp group and create a new one if not found- |
| pehrhovey | 0:a548a085de55 | 264 | * |
| pehrhovey | 0:a548a085de55 | 265 | * @param ifp the network interface for which to look |
| pehrhovey | 0:a548a085de55 | 266 | * @param addr the group ip address to search |
| pehrhovey | 0:a548a085de55 | 267 | * @return a struct igmp_group*, |
| pehrhovey | 0:a548a085de55 | 268 | * NULL on memory error. |
| pehrhovey | 0:a548a085de55 | 269 | */ |
| pehrhovey | 0:a548a085de55 | 270 | struct igmp_group * |
| pehrhovey | 0:a548a085de55 | 271 | igmp_lookup_group(struct netif *ifp, struct ip_addr *addr) |
| pehrhovey | 0:a548a085de55 | 272 | { |
| pehrhovey | 0:a548a085de55 | 273 | struct igmp_group *group = igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 274 | |
| pehrhovey | 0:a548a085de55 | 275 | /* Search if the group already exists */ |
| pehrhovey | 0:a548a085de55 | 276 | group = igmp_lookfor_group(ifp, addr); |
| pehrhovey | 0:a548a085de55 | 277 | if (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 278 | /* Group already exists. */ |
| pehrhovey | 0:a548a085de55 | 279 | return group; |
| pehrhovey | 0:a548a085de55 | 280 | } |
| pehrhovey | 0:a548a085de55 | 281 | |
| pehrhovey | 0:a548a085de55 | 282 | /* Group doesn't exist yet, create a new one */ |
| pehrhovey | 0:a548a085de55 | 283 | group = memp_malloc(MEMP_IGMP_GROUP); |
| pehrhovey | 0:a548a085de55 | 284 | if (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 285 | group->interface = ifp; |
| pehrhovey | 0:a548a085de55 | 286 | ip_addr_set(&(group->group_address), addr); |
| pehrhovey | 0:a548a085de55 | 287 | group->timer = 0; /* Not running */ |
| pehrhovey | 0:a548a085de55 | 288 | group->group_state = IGMP_GROUP_NON_MEMBER; |
| pehrhovey | 0:a548a085de55 | 289 | group->last_reporter_flag = 0; |
| pehrhovey | 0:a548a085de55 | 290 | group->use = 0; |
| pehrhovey | 0:a548a085de55 | 291 | group->next = igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 292 | |
| pehrhovey | 0:a548a085de55 | 293 | igmp_group_list = group; |
| pehrhovey | 0:a548a085de55 | 294 | } |
| pehrhovey | 0:a548a085de55 | 295 | |
| pehrhovey | 0:a548a085de55 | 296 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to "))); |
| pehrhovey | 0:a548a085de55 | 297 | ip_addr_debug_print(IGMP_DEBUG, addr); |
| pehrhovey | 0:a548a085de55 | 298 | LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp)); |
| pehrhovey | 0:a548a085de55 | 299 | |
| pehrhovey | 0:a548a085de55 | 300 | return group; |
| pehrhovey | 0:a548a085de55 | 301 | } |
| pehrhovey | 0:a548a085de55 | 302 | |
| pehrhovey | 0:a548a085de55 | 303 | /** |
| pehrhovey | 0:a548a085de55 | 304 | * Remove a group in the global igmp_group_list |
| pehrhovey | 0:a548a085de55 | 305 | * |
| pehrhovey | 0:a548a085de55 | 306 | * @param group the group to remove from the global igmp_group_list |
| pehrhovey | 0:a548a085de55 | 307 | * @return ERR_OK if group was removed from the list, an err_t otherwise |
| pehrhovey | 0:a548a085de55 | 308 | */ |
| pehrhovey | 0:a548a085de55 | 309 | err_t |
| pehrhovey | 0:a548a085de55 | 310 | igmp_remove_group(struct igmp_group *group) |
| pehrhovey | 0:a548a085de55 | 311 | { |
| pehrhovey | 0:a548a085de55 | 312 | err_t err = ERR_OK; |
| pehrhovey | 0:a548a085de55 | 313 | |
| pehrhovey | 0:a548a085de55 | 314 | /* Is it the first group? */ |
| pehrhovey | 0:a548a085de55 | 315 | if (igmp_group_list == group) { |
| pehrhovey | 0:a548a085de55 | 316 | igmp_group_list = group->next; |
| pehrhovey | 0:a548a085de55 | 317 | } else { |
| pehrhovey | 0:a548a085de55 | 318 | /* look for group further down the list */ |
| pehrhovey | 0:a548a085de55 | 319 | struct igmp_group *tmpGroup; |
| pehrhovey | 0:a548a085de55 | 320 | for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) { |
| pehrhovey | 0:a548a085de55 | 321 | if (tmpGroup->next == group) { |
| pehrhovey | 0:a548a085de55 | 322 | tmpGroup->next = group->next; |
| pehrhovey | 0:a548a085de55 | 323 | break; |
| pehrhovey | 0:a548a085de55 | 324 | } |
| pehrhovey | 0:a548a085de55 | 325 | } |
| pehrhovey | 0:a548a085de55 | 326 | /* Group not found in the global igmp_group_list */ |
| pehrhovey | 0:a548a085de55 | 327 | if (tmpGroup == NULL) |
| pehrhovey | 0:a548a085de55 | 328 | err = ERR_ARG; |
| pehrhovey | 0:a548a085de55 | 329 | } |
| pehrhovey | 0:a548a085de55 | 330 | /* free group */ |
| pehrhovey | 0:a548a085de55 | 331 | memp_free(MEMP_IGMP_GROUP, group); |
| pehrhovey | 0:a548a085de55 | 332 | |
| pehrhovey | 0:a548a085de55 | 333 | return err; |
| pehrhovey | 0:a548a085de55 | 334 | } |
| pehrhovey | 0:a548a085de55 | 335 | |
| pehrhovey | 0:a548a085de55 | 336 | /** |
| pehrhovey | 0:a548a085de55 | 337 | * Called from ip_input() if a new IGMP packet is received. |
| pehrhovey | 0:a548a085de55 | 338 | * |
| pehrhovey | 0:a548a085de55 | 339 | * @param p received igmp packet, p->payload pointing to the ip header |
| pehrhovey | 0:a548a085de55 | 340 | * @param inp network interface on which the packet was received |
| pehrhovey | 0:a548a085de55 | 341 | * @param dest destination ip address of the igmp packet |
| pehrhovey | 0:a548a085de55 | 342 | */ |
| pehrhovey | 0:a548a085de55 | 343 | void |
| pehrhovey | 0:a548a085de55 | 344 | igmp_input(struct pbuf *p, struct netif *inp, struct ip_addr *dest) |
| pehrhovey | 0:a548a085de55 | 345 | { |
| pehrhovey | 0:a548a085de55 | 346 | struct ip_hdr * iphdr; |
| pehrhovey | 0:a548a085de55 | 347 | struct igmp_msg* igmp; |
| pehrhovey | 0:a548a085de55 | 348 | struct igmp_group* group; |
| pehrhovey | 0:a548a085de55 | 349 | struct igmp_group* groupref; |
| pehrhovey | 0:a548a085de55 | 350 | |
| pehrhovey | 0:a548a085de55 | 351 | /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */ |
| pehrhovey | 0:a548a085de55 | 352 | iphdr = p->payload; |
| pehrhovey | 0:a548a085de55 | 353 | if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) { |
| pehrhovey | 0:a548a085de55 | 354 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 355 | IGMP_STATS_INC(igmp.lenerr); |
| pehrhovey | 0:a548a085de55 | 356 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n")); |
| pehrhovey | 0:a548a085de55 | 357 | return; |
| pehrhovey | 0:a548a085de55 | 358 | } |
| pehrhovey | 0:a548a085de55 | 359 | |
| pehrhovey | 0:a548a085de55 | 360 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from ")); |
| pehrhovey | 0:a548a085de55 | 361 | ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src)); |
| pehrhovey | 0:a548a085de55 | 362 | LWIP_DEBUGF(IGMP_DEBUG, (" to address ")); |
| pehrhovey | 0:a548a085de55 | 363 | ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest)); |
| pehrhovey | 0:a548a085de55 | 364 | LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp)); |
| pehrhovey | 0:a548a085de55 | 365 | |
| pehrhovey | 0:a548a085de55 | 366 | /* Now calculate and check the checksum */ |
| pehrhovey | 0:a548a085de55 | 367 | igmp = (struct igmp_msg *)p->payload; |
| pehrhovey | 0:a548a085de55 | 368 | if (inet_chksum(igmp, p->len)) { |
| pehrhovey | 0:a548a085de55 | 369 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 370 | IGMP_STATS_INC(igmp.chkerr); |
| pehrhovey | 0:a548a085de55 | 371 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n")); |
| pehrhovey | 0:a548a085de55 | 372 | return; |
| pehrhovey | 0:a548a085de55 | 373 | } |
| pehrhovey | 0:a548a085de55 | 374 | |
| pehrhovey | 0:a548a085de55 | 375 | /* Packet is ok so find an existing group */ |
| pehrhovey | 0:a548a085de55 | 376 | group = igmp_lookfor_group(inp, dest); /* use the incoming IP address! */ |
| pehrhovey | 0:a548a085de55 | 377 | |
| pehrhovey | 0:a548a085de55 | 378 | /* If group can be found or create... */ |
| pehrhovey | 0:a548a085de55 | 379 | if (!group) { |
| pehrhovey | 0:a548a085de55 | 380 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 381 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n")); |
| pehrhovey | 0:a548a085de55 | 382 | return; |
| pehrhovey | 0:a548a085de55 | 383 | } |
| pehrhovey | 0:a548a085de55 | 384 | |
| pehrhovey | 0:a548a085de55 | 385 | /* NOW ACT ON THE INCOMING MESSAGE TYPE... */ |
| pehrhovey | 0:a548a085de55 | 386 | switch (igmp->igmp_msgtype) { |
| pehrhovey | 0:a548a085de55 | 387 | case IGMP_MEMB_QUERY: { |
| pehrhovey | 0:a548a085de55 | 388 | /* IGMP_MEMB_QUERY to the "all systems" address ? */ |
| pehrhovey | 0:a548a085de55 | 389 | if ((ip_addr_cmp(dest, &allsystems)) && (igmp->igmp_group_address.addr == 0)) { |
| pehrhovey | 0:a548a085de55 | 390 | /* THIS IS THE GENERAL QUERY */ |
| pehrhovey | 0:a548a085de55 | 391 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp))); |
| pehrhovey | 0:a548a085de55 | 392 | |
| pehrhovey | 0:a548a085de55 | 393 | if (igmp->igmp_maxresp == 0) { |
| pehrhovey | 0:a548a085de55 | 394 | IGMP_STATS_INC(igmp.v1_rxed); |
| pehrhovey | 0:a548a085de55 | 395 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n")); |
| pehrhovey | 0:a548a085de55 | 396 | igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR; |
| pehrhovey | 0:a548a085de55 | 397 | } |
| pehrhovey | 0:a548a085de55 | 398 | |
| pehrhovey | 0:a548a085de55 | 399 | IGMP_STATS_INC(igmp.group_query_rxed); |
| pehrhovey | 0:a548a085de55 | 400 | groupref = igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 401 | while (groupref) { |
| pehrhovey | 0:a548a085de55 | 402 | /* Do not send messages on the all systems group address! */ |
| pehrhovey | 0:a548a085de55 | 403 | if ((groupref->interface == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) { |
| pehrhovey | 0:a548a085de55 | 404 | igmp_delaying_member( groupref, igmp->igmp_maxresp); |
| pehrhovey | 0:a548a085de55 | 405 | } |
| pehrhovey | 0:a548a085de55 | 406 | groupref = groupref->next; |
| pehrhovey | 0:a548a085de55 | 407 | } |
| pehrhovey | 0:a548a085de55 | 408 | } else { |
| pehrhovey | 0:a548a085de55 | 409 | /* IGMP_MEMB_QUERY to a specific group ? */ |
| pehrhovey | 0:a548a085de55 | 410 | if (group->group_address.addr != 0) { |
| pehrhovey | 0:a548a085de55 | 411 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group ")); |
| pehrhovey | 0:a548a085de55 | 412 | ip_addr_debug_print(IGMP_DEBUG, &group->group_address); |
| pehrhovey | 0:a548a085de55 | 413 | if (ip_addr_cmp (dest, &allsystems)) { |
| pehrhovey | 0:a548a085de55 | 414 | LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp))); |
| pehrhovey | 0:a548a085de55 | 415 | /* we first need to re-lookfor the group since we used dest last time */ |
| pehrhovey | 0:a548a085de55 | 416 | group = igmp_lookfor_group(inp, &igmp->igmp_group_address); |
| pehrhovey | 0:a548a085de55 | 417 | } else { |
| pehrhovey | 0:a548a085de55 | 418 | LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp))); |
| pehrhovey | 0:a548a085de55 | 419 | } |
| pehrhovey | 0:a548a085de55 | 420 | |
| pehrhovey | 0:a548a085de55 | 421 | if (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 422 | IGMP_STATS_INC(igmp.unicast_query); |
| pehrhovey | 0:a548a085de55 | 423 | igmp_delaying_member( group, igmp->igmp_maxresp); |
| pehrhovey | 0:a548a085de55 | 424 | } |
| pehrhovey | 0:a548a085de55 | 425 | } |
| pehrhovey | 0:a548a085de55 | 426 | } |
| pehrhovey | 0:a548a085de55 | 427 | break; |
| pehrhovey | 0:a548a085de55 | 428 | } |
| pehrhovey | 0:a548a085de55 | 429 | case IGMP_V2_MEMB_REPORT: { |
| pehrhovey | 0:a548a085de55 | 430 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n")); |
| pehrhovey | 0:a548a085de55 | 431 | |
| pehrhovey | 0:a548a085de55 | 432 | IGMP_STATS_INC(igmp.report_rxed); |
| pehrhovey | 0:a548a085de55 | 433 | if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) { |
| pehrhovey | 0:a548a085de55 | 434 | /* This is on a specific group we have already looked up */ |
| pehrhovey | 0:a548a085de55 | 435 | group->timer = 0; /* stopped */ |
| pehrhovey | 0:a548a085de55 | 436 | group->group_state = IGMP_GROUP_IDLE_MEMBER; |
| pehrhovey | 0:a548a085de55 | 437 | group->last_reporter_flag = 0; |
| pehrhovey | 0:a548a085de55 | 438 | } |
| pehrhovey | 0:a548a085de55 | 439 | break; |
| pehrhovey | 0:a548a085de55 | 440 | } |
| pehrhovey | 0:a548a085de55 | 441 | default: { |
| pehrhovey | 0:a548a085de55 | 442 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n", |
| pehrhovey | 0:a548a085de55 | 443 | igmp->igmp_msgtype, group->group_state, &group, group->interface)); |
| pehrhovey | 0:a548a085de55 | 444 | break; |
| pehrhovey | 0:a548a085de55 | 445 | } |
| pehrhovey | 0:a548a085de55 | 446 | } |
| pehrhovey | 0:a548a085de55 | 447 | |
| pehrhovey | 0:a548a085de55 | 448 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 449 | return; |
| pehrhovey | 0:a548a085de55 | 450 | } |
| pehrhovey | 0:a548a085de55 | 451 | |
| pehrhovey | 0:a548a085de55 | 452 | /** |
| pehrhovey | 0:a548a085de55 | 453 | * Join a group on one network interface. |
| pehrhovey | 0:a548a085de55 | 454 | * |
| pehrhovey | 0:a548a085de55 | 455 | * @param ifaddr ip address of the network interface which should join a new group |
| pehrhovey | 0:a548a085de55 | 456 | * @param groupaddr the ip address of the group which to join |
| pehrhovey | 0:a548a085de55 | 457 | * @return ERR_OK if group was joined on the netif(s), an err_t otherwise |
| pehrhovey | 0:a548a085de55 | 458 | */ |
| pehrhovey | 0:a548a085de55 | 459 | err_t |
| pehrhovey | 0:a548a085de55 | 460 | igmp_joingroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr) |
| pehrhovey | 0:a548a085de55 | 461 | { |
| pehrhovey | 0:a548a085de55 | 462 | err_t err = ERR_VAL; /* no matching interface */ |
| pehrhovey | 0:a548a085de55 | 463 | struct igmp_group *group; |
| pehrhovey | 0:a548a085de55 | 464 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 465 | |
| pehrhovey | 0:a548a085de55 | 466 | /* make sure it is multicast address */ |
| pehrhovey | 0:a548a085de55 | 467 | LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;); |
| pehrhovey | 0:a548a085de55 | 468 | LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;); |
| pehrhovey | 0:a548a085de55 | 469 | |
| pehrhovey | 0:a548a085de55 | 470 | /* loop through netif's */ |
| pehrhovey | 0:a548a085de55 | 471 | netif = netif_list; |
| pehrhovey | 0:a548a085de55 | 472 | while (netif != NULL) { |
| pehrhovey | 0:a548a085de55 | 473 | /* Should we join this interface ? */ |
| pehrhovey | 0:a548a085de55 | 474 | if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) { |
| pehrhovey | 0:a548a085de55 | 475 | /* find group or create a new one if not found */ |
| pehrhovey | 0:a548a085de55 | 476 | group = igmp_lookup_group(netif, groupaddr); |
| pehrhovey | 0:a548a085de55 | 477 | |
| pehrhovey | 0:a548a085de55 | 478 | if (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 479 | /* This should create a new group, check the state to make sure */ |
| pehrhovey | 0:a548a085de55 | 480 | if (group->group_state != IGMP_GROUP_NON_MEMBER) { |
| pehrhovey | 0:a548a085de55 | 481 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n")); |
| pehrhovey | 0:a548a085de55 | 482 | } else { |
| pehrhovey | 0:a548a085de55 | 483 | /* OK - it was new group */ |
| pehrhovey | 0:a548a085de55 | 484 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: ")); |
| pehrhovey | 0:a548a085de55 | 485 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| pehrhovey | 0:a548a085de55 | 486 | LWIP_DEBUGF(IGMP_DEBUG, ("\n")); |
| pehrhovey | 0:a548a085de55 | 487 | |
| pehrhovey | 0:a548a085de55 | 488 | /* If first use of the group, allow the group at the MAC level */ |
| pehrhovey | 0:a548a085de55 | 489 | if ((group->use==0) && (netif->igmp_mac_filter != NULL)) { |
| pehrhovey | 0:a548a085de55 | 490 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD ")); |
| pehrhovey | 0:a548a085de55 | 491 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| pehrhovey | 0:a548a085de55 | 492 | LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif)); |
| pehrhovey | 0:a548a085de55 | 493 | netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER); |
| pehrhovey | 0:a548a085de55 | 494 | } |
| pehrhovey | 0:a548a085de55 | 495 | |
| pehrhovey | 0:a548a085de55 | 496 | IGMP_STATS_INC(igmp.join_sent); |
| pehrhovey | 0:a548a085de55 | 497 | igmp_send(group, IGMP_V2_MEMB_REPORT); |
| pehrhovey | 0:a548a085de55 | 498 | |
| pehrhovey | 0:a548a085de55 | 499 | igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR); |
| pehrhovey | 0:a548a085de55 | 500 | |
| pehrhovey | 0:a548a085de55 | 501 | /* Need to work out where this timer comes from */ |
| pehrhovey | 0:a548a085de55 | 502 | group->group_state = IGMP_GROUP_DELAYING_MEMBER; |
| pehrhovey | 0:a548a085de55 | 503 | } |
| pehrhovey | 0:a548a085de55 | 504 | /* Increment group use */ |
| pehrhovey | 0:a548a085de55 | 505 | group->use++; |
| pehrhovey | 0:a548a085de55 | 506 | /* Join on this interface */ |
| pehrhovey | 0:a548a085de55 | 507 | err = ERR_OK; |
| pehrhovey | 0:a548a085de55 | 508 | } else { |
| pehrhovey | 0:a548a085de55 | 509 | /* Return an error even if some network interfaces are joined */ |
| pehrhovey | 0:a548a085de55 | 510 | /** @todo undo any other netif already joined */ |
| pehrhovey | 0:a548a085de55 | 511 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n")); |
| pehrhovey | 0:a548a085de55 | 512 | return ERR_MEM; |
| pehrhovey | 0:a548a085de55 | 513 | } |
| pehrhovey | 0:a548a085de55 | 514 | } |
| pehrhovey | 0:a548a085de55 | 515 | /* proceed to next network interface */ |
| pehrhovey | 0:a548a085de55 | 516 | netif = netif->next; |
| pehrhovey | 0:a548a085de55 | 517 | } |
| pehrhovey | 0:a548a085de55 | 518 | |
| pehrhovey | 0:a548a085de55 | 519 | return err; |
| pehrhovey | 0:a548a085de55 | 520 | } |
| pehrhovey | 0:a548a085de55 | 521 | |
| pehrhovey | 0:a548a085de55 | 522 | /** |
| pehrhovey | 0:a548a085de55 | 523 | * Leave a group on one network interface. |
| pehrhovey | 0:a548a085de55 | 524 | * |
| pehrhovey | 0:a548a085de55 | 525 | * @param ifaddr ip address of the network interface which should leave a group |
| pehrhovey | 0:a548a085de55 | 526 | * @param groupaddr the ip address of the group which to leave |
| pehrhovey | 0:a548a085de55 | 527 | * @return ERR_OK if group was left on the netif(s), an err_t otherwise |
| pehrhovey | 0:a548a085de55 | 528 | */ |
| pehrhovey | 0:a548a085de55 | 529 | err_t |
| pehrhovey | 0:a548a085de55 | 530 | igmp_leavegroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr) |
| pehrhovey | 0:a548a085de55 | 531 | { |
| pehrhovey | 0:a548a085de55 | 532 | err_t err = ERR_VAL; /* no matching interface */ |
| pehrhovey | 0:a548a085de55 | 533 | struct igmp_group *group; |
| pehrhovey | 0:a548a085de55 | 534 | struct netif *netif; |
| pehrhovey | 0:a548a085de55 | 535 | |
| pehrhovey | 0:a548a085de55 | 536 | /* make sure it is multicast address */ |
| pehrhovey | 0:a548a085de55 | 537 | LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;); |
| pehrhovey | 0:a548a085de55 | 538 | LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;); |
| pehrhovey | 0:a548a085de55 | 539 | |
| pehrhovey | 0:a548a085de55 | 540 | /* loop through netif's */ |
| pehrhovey | 0:a548a085de55 | 541 | netif = netif_list; |
| pehrhovey | 0:a548a085de55 | 542 | while (netif != NULL) { |
| pehrhovey | 0:a548a085de55 | 543 | /* Should we leave this interface ? */ |
| pehrhovey | 0:a548a085de55 | 544 | if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) { |
| pehrhovey | 0:a548a085de55 | 545 | /* find group */ |
| pehrhovey | 0:a548a085de55 | 546 | group = igmp_lookfor_group(netif, groupaddr); |
| pehrhovey | 0:a548a085de55 | 547 | |
| pehrhovey | 0:a548a085de55 | 548 | if (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 549 | /* Only send a leave if the flag is set according to the state diagram */ |
| pehrhovey | 0:a548a085de55 | 550 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: ")); |
| pehrhovey | 0:a548a085de55 | 551 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| pehrhovey | 0:a548a085de55 | 552 | LWIP_DEBUGF(IGMP_DEBUG, ("\n")); |
| pehrhovey | 0:a548a085de55 | 553 | |
| pehrhovey | 0:a548a085de55 | 554 | /* If there is no other use of the group */ |
| pehrhovey | 0:a548a085de55 | 555 | if (group->use <= 1) { |
| pehrhovey | 0:a548a085de55 | 556 | /* If we are the last reporter for this group */ |
| pehrhovey | 0:a548a085de55 | 557 | if (group->last_reporter_flag) { |
| pehrhovey | 0:a548a085de55 | 558 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n")); |
| pehrhovey | 0:a548a085de55 | 559 | IGMP_STATS_INC(igmp.leave_sent); |
| pehrhovey | 0:a548a085de55 | 560 | igmp_send(group, IGMP_LEAVE_GROUP); |
| pehrhovey | 0:a548a085de55 | 561 | } |
| pehrhovey | 0:a548a085de55 | 562 | |
| pehrhovey | 0:a548a085de55 | 563 | /* Disable the group at the MAC level */ |
| pehrhovey | 0:a548a085de55 | 564 | if (netif->igmp_mac_filter != NULL) { |
| pehrhovey | 0:a548a085de55 | 565 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL ")); |
| pehrhovey | 0:a548a085de55 | 566 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| pehrhovey | 0:a548a085de55 | 567 | LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif)); |
| pehrhovey | 0:a548a085de55 | 568 | netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER); |
| pehrhovey | 0:a548a085de55 | 569 | } |
| pehrhovey | 0:a548a085de55 | 570 | |
| pehrhovey | 0:a548a085de55 | 571 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: ")); |
| pehrhovey | 0:a548a085de55 | 572 | ip_addr_debug_print(IGMP_DEBUG, groupaddr); |
| pehrhovey | 0:a548a085de55 | 573 | LWIP_DEBUGF(IGMP_DEBUG, ("\n")); |
| pehrhovey | 0:a548a085de55 | 574 | |
| pehrhovey | 0:a548a085de55 | 575 | /* Free the group */ |
| pehrhovey | 0:a548a085de55 | 576 | igmp_remove_group(group); |
| pehrhovey | 0:a548a085de55 | 577 | } else { |
| pehrhovey | 0:a548a085de55 | 578 | /* Decrement group use */ |
| pehrhovey | 0:a548a085de55 | 579 | group->use--; |
| pehrhovey | 0:a548a085de55 | 580 | } |
| pehrhovey | 0:a548a085de55 | 581 | /* Leave on this interface */ |
| pehrhovey | 0:a548a085de55 | 582 | err = ERR_OK; |
| pehrhovey | 0:a548a085de55 | 583 | } else { |
| pehrhovey | 0:a548a085de55 | 584 | /* It's not a fatal error on "leavegroup" */ |
| pehrhovey | 0:a548a085de55 | 585 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n")); |
| pehrhovey | 0:a548a085de55 | 586 | } |
| pehrhovey | 0:a548a085de55 | 587 | } |
| pehrhovey | 0:a548a085de55 | 588 | /* proceed to next network interface */ |
| pehrhovey | 0:a548a085de55 | 589 | netif = netif->next; |
| pehrhovey | 0:a548a085de55 | 590 | } |
| pehrhovey | 0:a548a085de55 | 591 | |
| pehrhovey | 0:a548a085de55 | 592 | return err; |
| pehrhovey | 0:a548a085de55 | 593 | } |
| pehrhovey | 0:a548a085de55 | 594 | |
| pehrhovey | 0:a548a085de55 | 595 | /** |
| pehrhovey | 0:a548a085de55 | 596 | * The igmp timer function (both for NO_SYS=1 and =0) |
| pehrhovey | 0:a548a085de55 | 597 | * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default). |
| pehrhovey | 0:a548a085de55 | 598 | */ |
| pehrhovey | 0:a548a085de55 | 599 | void |
| pehrhovey | 0:a548a085de55 | 600 | igmp_tmr(void) |
| pehrhovey | 0:a548a085de55 | 601 | { |
| pehrhovey | 0:a548a085de55 | 602 | struct igmp_group *group = igmp_group_list; |
| pehrhovey | 0:a548a085de55 | 603 | |
| pehrhovey | 0:a548a085de55 | 604 | while (group != NULL) { |
| pehrhovey | 0:a548a085de55 | 605 | if (group->timer != 0) { |
| pehrhovey | 0:a548a085de55 | 606 | group->timer -= 1; |
| pehrhovey | 0:a548a085de55 | 607 | if (group->timer == 0) { |
| pehrhovey | 0:a548a085de55 | 608 | igmp_timeout(group); |
| pehrhovey | 0:a548a085de55 | 609 | } |
| pehrhovey | 0:a548a085de55 | 610 | } |
| pehrhovey | 0:a548a085de55 | 611 | group = group->next; |
| pehrhovey | 0:a548a085de55 | 612 | } |
| pehrhovey | 0:a548a085de55 | 613 | } |
| pehrhovey | 0:a548a085de55 | 614 | |
| pehrhovey | 0:a548a085de55 | 615 | /** |
| pehrhovey | 0:a548a085de55 | 616 | * Called if a timeout for one group is reached. |
| pehrhovey | 0:a548a085de55 | 617 | * Sends a report for this group. |
| pehrhovey | 0:a548a085de55 | 618 | * |
| pehrhovey | 0:a548a085de55 | 619 | * @param group an igmp_group for which a timeout is reached |
| pehrhovey | 0:a548a085de55 | 620 | */ |
| pehrhovey | 0:a548a085de55 | 621 | void |
| pehrhovey | 0:a548a085de55 | 622 | igmp_timeout(struct igmp_group *group) |
| pehrhovey | 0:a548a085de55 | 623 | { |
| pehrhovey | 0:a548a085de55 | 624 | /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */ |
| pehrhovey | 0:a548a085de55 | 625 | if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) { |
| pehrhovey | 0:a548a085de55 | 626 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address ")); |
| pehrhovey | 0:a548a085de55 | 627 | ip_addr_debug_print(IGMP_DEBUG, &(group->group_address)); |
| pehrhovey | 0:a548a085de55 | 628 | LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->interface)); |
| pehrhovey | 0:a548a085de55 | 629 | |
| pehrhovey | 0:a548a085de55 | 630 | igmp_send(group, IGMP_V2_MEMB_REPORT); |
| pehrhovey | 0:a548a085de55 | 631 | } |
| pehrhovey | 0:a548a085de55 | 632 | } |
| pehrhovey | 0:a548a085de55 | 633 | |
| pehrhovey | 0:a548a085de55 | 634 | /** |
| pehrhovey | 0:a548a085de55 | 635 | * Start a timer for an igmp group |
| pehrhovey | 0:a548a085de55 | 636 | * |
| pehrhovey | 0:a548a085de55 | 637 | * @param group the igmp_group for which to start a timer |
| pehrhovey | 0:a548a085de55 | 638 | * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with |
| pehrhovey | 0:a548a085de55 | 639 | * every call to igmp_tmr()) |
| pehrhovey | 0:a548a085de55 | 640 | */ |
| pehrhovey | 0:a548a085de55 | 641 | void |
| pehrhovey | 0:a548a085de55 | 642 | igmp_start_timer(struct igmp_group *group, u8_t max_time) |
| pehrhovey | 0:a548a085de55 | 643 | { |
| pehrhovey | 0:a548a085de55 | 644 | /** |
| pehrhovey | 0:a548a085de55 | 645 | * @todo Important !! this should be random 0 -> max_time. Find out how to do this |
| pehrhovey | 0:a548a085de55 | 646 | */ |
| pehrhovey | 0:a548a085de55 | 647 | group->timer = max_time; |
| pehrhovey | 0:a548a085de55 | 648 | } |
| pehrhovey | 0:a548a085de55 | 649 | |
| pehrhovey | 0:a548a085de55 | 650 | /** |
| pehrhovey | 0:a548a085de55 | 651 | * Stop a timer for an igmp_group |
| pehrhovey | 0:a548a085de55 | 652 | * |
| pehrhovey | 0:a548a085de55 | 653 | * @param group the igmp_group for which to stop the timer |
| pehrhovey | 0:a548a085de55 | 654 | */ |
| pehrhovey | 0:a548a085de55 | 655 | void |
| pehrhovey | 0:a548a085de55 | 656 | igmp_stop_timer(struct igmp_group *group) |
| pehrhovey | 0:a548a085de55 | 657 | { |
| pehrhovey | 0:a548a085de55 | 658 | group->timer = 0; |
| pehrhovey | 0:a548a085de55 | 659 | } |
| pehrhovey | 0:a548a085de55 | 660 | |
| pehrhovey | 0:a548a085de55 | 661 | /** |
| pehrhovey | 0:a548a085de55 | 662 | * Delaying membership report for a group if necessary |
| pehrhovey | 0:a548a085de55 | 663 | * |
| pehrhovey | 0:a548a085de55 | 664 | * @param group the igmp_group for which "delaying" membership report |
| pehrhovey | 0:a548a085de55 | 665 | * @param maxresp query delay |
| pehrhovey | 0:a548a085de55 | 666 | */ |
| pehrhovey | 0:a548a085de55 | 667 | void |
| pehrhovey | 0:a548a085de55 | 668 | igmp_delaying_member( struct igmp_group *group, u8_t maxresp) |
| pehrhovey | 0:a548a085de55 | 669 | { |
| pehrhovey | 0:a548a085de55 | 670 | if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) || |
| pehrhovey | 0:a548a085de55 | 671 | ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) && (maxresp > group->timer))) { |
| pehrhovey | 0:a548a085de55 | 672 | igmp_start_timer(group, (maxresp)/2); |
| pehrhovey | 0:a548a085de55 | 673 | group->group_state = IGMP_GROUP_DELAYING_MEMBER; |
| pehrhovey | 0:a548a085de55 | 674 | } |
| pehrhovey | 0:a548a085de55 | 675 | } |
| pehrhovey | 0:a548a085de55 | 676 | |
| pehrhovey | 0:a548a085de55 | 677 | |
| pehrhovey | 0:a548a085de55 | 678 | /** |
| pehrhovey | 0:a548a085de55 | 679 | * Sends an IP packet on a network interface. This function constructs the IP header |
| pehrhovey | 0:a548a085de55 | 680 | * and calculates the IP header checksum. If the source IP address is NULL, |
| pehrhovey | 0:a548a085de55 | 681 | * the IP address of the outgoing network interface is filled in as source address. |
| pehrhovey | 0:a548a085de55 | 682 | * |
| pehrhovey | 0:a548a085de55 | 683 | * @param p the packet to send (p->payload points to the data, e.g. next |
| pehrhovey | 0:a548a085de55 | 684 | protocol header; if dest == IP_HDRINCL, p already includes an IP |
| pehrhovey | 0:a548a085de55 | 685 | header and p->payload points to that IP header) |
| pehrhovey | 0:a548a085de55 | 686 | * @param src the source IP address to send from (if src == IP_ADDR_ANY, the |
| pehrhovey | 0:a548a085de55 | 687 | * IP address of the netif used to send is used as source address) |
| pehrhovey | 0:a548a085de55 | 688 | * @param dest the destination IP address to send the packet to |
| pehrhovey | 0:a548a085de55 | 689 | * @param ttl the TTL value to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 690 | * @param proto the PROTOCOL to be set in the IP header |
| pehrhovey | 0:a548a085de55 | 691 | * @param netif the netif on which to send this packet |
| pehrhovey | 0:a548a085de55 | 692 | * @return ERR_OK if the packet was sent OK |
| pehrhovey | 0:a548a085de55 | 693 | * ERR_BUF if p doesn't have enough space for IP/LINK headers |
| pehrhovey | 0:a548a085de55 | 694 | * returns errors returned by netif->output |
| pehrhovey | 0:a548a085de55 | 695 | */ |
| pehrhovey | 0:a548a085de55 | 696 | err_t |
| pehrhovey | 0:a548a085de55 | 697 | igmp_ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, |
| pehrhovey | 0:a548a085de55 | 698 | u8_t ttl, u8_t proto, struct netif *netif) |
| pehrhovey | 0:a548a085de55 | 699 | { |
| pehrhovey | 0:a548a085de55 | 700 | /* This is the "router alert" option */ |
| pehrhovey | 0:a548a085de55 | 701 | u16_t ra[2]; |
| pehrhovey | 0:a548a085de55 | 702 | ra[0] = htons (ROUTER_ALERT); |
| pehrhovey | 0:a548a085de55 | 703 | ra[1] = 0x0000; /* Router shall examine packet */ |
| pehrhovey | 0:a548a085de55 | 704 | return ip_output_if_opt(p, src, dest, ttl, 0, proto, netif, ra, ROUTER_ALERTLEN); |
| pehrhovey | 0:a548a085de55 | 705 | } |
| pehrhovey | 0:a548a085de55 | 706 | |
| pehrhovey | 0:a548a085de55 | 707 | /** |
| pehrhovey | 0:a548a085de55 | 708 | * Send an igmp packet to a specific group. |
| pehrhovey | 0:a548a085de55 | 709 | * |
| pehrhovey | 0:a548a085de55 | 710 | * @param group the group to which to send the packet |
| pehrhovey | 0:a548a085de55 | 711 | * @param type the type of igmp packet to send |
| pehrhovey | 0:a548a085de55 | 712 | */ |
| pehrhovey | 0:a548a085de55 | 713 | void |
| pehrhovey | 0:a548a085de55 | 714 | igmp_send(struct igmp_group *group, u8_t type) |
| pehrhovey | 0:a548a085de55 | 715 | { |
| pehrhovey | 0:a548a085de55 | 716 | struct pbuf* p = NULL; |
| pehrhovey | 0:a548a085de55 | 717 | struct igmp_msg* igmp = NULL; |
| pehrhovey | 0:a548a085de55 | 718 | struct ip_addr src = {0}; |
| pehrhovey | 0:a548a085de55 | 719 | struct ip_addr* dest = NULL; |
| pehrhovey | 0:a548a085de55 | 720 | |
| pehrhovey | 0:a548a085de55 | 721 | /* IP header + "router alert" option + IGMP header */ |
| pehrhovey | 0:a548a085de55 | 722 | p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM); |
| pehrhovey | 0:a548a085de55 | 723 | |
| pehrhovey | 0:a548a085de55 | 724 | if (p) { |
| pehrhovey | 0:a548a085de55 | 725 | igmp = p->payload; |
| pehrhovey | 0:a548a085de55 | 726 | LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg", |
| pehrhovey | 0:a548a085de55 | 727 | (p->len >= sizeof(struct igmp_msg))); |
| pehrhovey | 0:a548a085de55 | 728 | ip_addr_set(&src, &((group->interface)->ip_addr)); |
| pehrhovey | 0:a548a085de55 | 729 | |
| pehrhovey | 0:a548a085de55 | 730 | if (type == IGMP_V2_MEMB_REPORT) { |
| pehrhovey | 0:a548a085de55 | 731 | dest = &(group->group_address); |
| pehrhovey | 0:a548a085de55 | 732 | IGMP_STATS_INC(igmp.report_sent); |
| pehrhovey | 0:a548a085de55 | 733 | ip_addr_set(&(igmp->igmp_group_address), &(group->group_address)); |
| pehrhovey | 0:a548a085de55 | 734 | group->last_reporter_flag = 1; /* Remember we were the last to report */ |
| pehrhovey | 0:a548a085de55 | 735 | } else { |
| pehrhovey | 0:a548a085de55 | 736 | if (type == IGMP_LEAVE_GROUP) { |
| pehrhovey | 0:a548a085de55 | 737 | dest = &allrouters; |
| pehrhovey | 0:a548a085de55 | 738 | ip_addr_set(&(igmp->igmp_group_address), &(group->group_address)); |
| pehrhovey | 0:a548a085de55 | 739 | } |
| pehrhovey | 0:a548a085de55 | 740 | } |
| pehrhovey | 0:a548a085de55 | 741 | |
| pehrhovey | 0:a548a085de55 | 742 | if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) { |
| pehrhovey | 0:a548a085de55 | 743 | igmp->igmp_msgtype = type; |
| pehrhovey | 0:a548a085de55 | 744 | igmp->igmp_maxresp = 0; |
| pehrhovey | 0:a548a085de55 | 745 | igmp->igmp_checksum = 0; |
| pehrhovey | 0:a548a085de55 | 746 | igmp->igmp_checksum = inet_chksum( igmp, IGMP_MINLEN); |
| pehrhovey | 0:a548a085de55 | 747 | |
| pehrhovey | 0:a548a085de55 | 748 | igmp_ip_output_if(p, &src, dest, IGMP_TTL, IP_PROTO_IGMP, group->interface); |
| pehrhovey | 0:a548a085de55 | 749 | } |
| pehrhovey | 0:a548a085de55 | 750 | |
| pehrhovey | 0:a548a085de55 | 751 | pbuf_free(p); |
| pehrhovey | 0:a548a085de55 | 752 | } else { |
| pehrhovey | 0:a548a085de55 | 753 | LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n")); |
| pehrhovey | 0:a548a085de55 | 754 | } |
| pehrhovey | 0:a548a085de55 | 755 | } |
| pehrhovey | 0:a548a085de55 | 756 | |
| pehrhovey | 0:a548a085de55 | 757 | #endif /* LWIP_IGMP */ |