Hendrik Lipka
Stripped down version of Segundos NetService library (http://mbed.org/users/segundo/libraries/NetServices ). I have removed all NetServices, and all functions which had been disabled. Use this version when you need only pure TCP or UDP functions - this library compiles faster.
Dependents: christmasLights device_server pop3demo device_server_udp ... more
Diff: lwip/core/ipv4/igmp.c
- Revision:
- 1:9d93f4dc2f46
- Parent:
- 0:8b387bed54c2
diff -r 8b387bed54c2 -r 9d93f4dc2f46 lwip/core/ipv4/igmp.c
--- a/lwip/core/ipv4/igmp.c Mon Jan 10 21:03:11 2011 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,818 +0,0 @@
-#pragma diag_remark 177
-/**
- * @file
- * IGMP - Internet Group Management Protocol
- *
- */
-
-/*
- * Copyright (c) 2002 CITEL Technologies Ltd.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * This file is a contribution to the lwIP TCP/IP stack.
- * The Swedish Institute of Computer Science and Adam Dunkels
- * are specifically granted permission to redistribute this
- * source code.
-*/
-
-/*-------------------------------------------------------------
-Note 1)
-Although the rfc requires V1 AND V2 capability
-we will only support v2 since now V1 is very old (August 1989)
-V1 can be added if required
-
-a debug print and statistic have been implemented to
-show this up.
--------------------------------------------------------------
--------------------------------------------------------------
-Note 2)
-A query for a specific group address (as opposed to ALLHOSTS)
-has now been implemented as I am unsure if it is required
-
-a debug print and statistic have been implemented to
-show this up.
--------------------------------------------------------------
--------------------------------------------------------------
-Note 3)
-The router alert rfc 2113 is implemented in outgoing packets
-but not checked rigorously incoming
--------------------------------------------------------------
-Steve Reynolds
-------------------------------------------------------------*/
-
-/*-----------------------------------------------------------------------------
- * RFC 988 - Host extensions for IP multicasting - V0
- * RFC 1054 - Host extensions for IP multicasting -
- * RFC 1112 - Host extensions for IP multicasting - V1
- * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
- * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
- * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
- * RFC 2113 - IP Router Alert Option -
- *----------------------------------------------------------------------------*/
-
-/*-----------------------------------------------------------------------------
- * Includes
- *----------------------------------------------------------------------------*/
-
-#include "lwip/opt.h"
-
-#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
-
-#include "lwip/igmp.h"
-#include "lwip/debug.h"
-#include "lwip/def.h"
-#include "lwip/mem.h"
-#include "lwip/ip.h"
-#include "lwip/inet_chksum.h"
-#include "lwip/netif.h"
-#include "lwip/icmp.h"
-#include "lwip/udp.h"
-#include "lwip/tcp.h"
-#include "lwip/stats.h"
-
-#include "string.h"
-
-/*
- * IGMP constants
- */
-#define IGMP_TTL 1
-#define IGMP_MINLEN 8
-#define ROUTER_ALERT 0x9404
-#define ROUTER_ALERTLEN 4
-
-/*
- * IGMP message types, including version number.
- */
-#define IGMP_MEMB_QUERY 0x11 /* Membership query */
-#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
-#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
-#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
-
-/* Group membership states */
-#define IGMP_GROUP_NON_MEMBER 0
-#define IGMP_GROUP_DELAYING_MEMBER 1
-#define IGMP_GROUP_IDLE_MEMBER 2
-
-/**
- * IGMP packet format.
- */
-#ifdef PACK_STRUCT_USE_INCLUDES
-# include "arch/bpstruct.h"
-#endif
-PACK_STRUCT_BEGIN
-struct igmp_msg {
- PACK_STRUCT_FIELD(u8_t igmp_msgtype);
- PACK_STRUCT_FIELD(u8_t igmp_maxresp);
- PACK_STRUCT_FIELD(u16_t igmp_checksum);
- PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
-} PACK_STRUCT_STRUCT;
-PACK_STRUCT_END
-#ifdef PACK_STRUCT_USE_INCLUDES
-# include "arch/epstruct.h"
-#endif
-
-
-static struct igmp_group *igmp_lookup_group(struct netif *ifp, ip_addr_t *addr);
-static err_t igmp_remove_group(struct igmp_group *group);
-static void igmp_timeout( struct igmp_group *group);
-static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
-static void igmp_stop_timer(struct igmp_group *group);
-static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
-static err_t igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif);
-static void igmp_send(struct igmp_group *group, u8_t type);
-
-
-static struct igmp_group* igmp_group_list;
-static ip_addr_t allsystems;
-static ip_addr_t allrouters;
-
-
-/**
- * Initialize the IGMP module
- */
-void
-igmp_init(void)
-{
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
-
- IP4_ADDR(&allsystems, 224, 0, 0, 1);
- IP4_ADDR(&allrouters, 224, 0, 0, 2);
-}
-
-#ifdef LWIP_DEBUG
-/**
- * Dump global IGMP groups list
- */
-void
-igmp_dump_group_list()
-{
- struct igmp_group *group = igmp_group_list;
-
- while (group != NULL) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
- ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
- LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
- group = group->next;
- }
- LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
-}
-#else
-#define igmp_dump_group_list()
-#endif /* LWIP_DEBUG */
-
-/**
- * Start IGMP processing on interface
- *
- * @param netif network interface on which start IGMP processing
- */
-err_t
-igmp_start(struct netif *netif)
-{
- struct igmp_group* group;
-
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
-
- group = igmp_lookup_group(netif, &allsystems);
-
- if (group != NULL) {
- group->group_state = IGMP_GROUP_IDLE_MEMBER;
- group->use++;
-
- /* Allow the igmp messages at the MAC level */
- if (netif->igmp_mac_filter != NULL) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
- ip_addr_debug_print(IGMP_DEBUG, &allsystems);
- LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
- netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
- }
-
- return ERR_OK;
- }
-
- return ERR_MEM;
-}
-
-/**
- * Stop IGMP processing on interface
- *
- * @param netif network interface on which stop IGMP processing
- */
-err_t
-igmp_stop(struct netif *netif)
-{
- struct igmp_group *group = igmp_group_list;
- struct igmp_group *prev = NULL;
- struct igmp_group *next;
-
- /* look for groups joined on this interface further down the list */
- while (group != NULL) {
- next = group->next;
- /* is it a group joined on this interface? */
- if (group->netif == netif) {
- /* is it the first group of the list? */
- if (group == igmp_group_list) {
- igmp_group_list = next;
- }
- /* is there a "previous" group defined? */
- if (prev != NULL) {
- prev->next = next;
- }
- /* disable the group at the MAC level */
- if (netif->igmp_mac_filter != NULL) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
- ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
- LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
- netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
- }
- /* free group */
- memp_free(MEMP_IGMP_GROUP, group);
- } else {
- /* change the "previous" */
- prev = group;
- }
- /* move to "next" */
- group = next;
- }
- return ERR_OK;
-}
-
-/**
- * Report IGMP memberships for this interface
- *
- * @param netif network interface on which report IGMP memberships
- */
-void
-igmp_report_groups(struct netif *netif)
-{
- struct igmp_group *group = igmp_group_list;
-
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
-
- while (group != NULL) {
- if (group->netif == netif) {
- igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
- }
- group = group->next;
- }
-}
-
-/**
- * Search for a group in the global igmp_group_list
- *
- * @param ifp the network interface for which to look
- * @param addr the group ip address to search for
- * @return a struct igmp_group* if the group has been found,
- * NULL if the group wasn't found.
- */
-struct igmp_group *
-igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr)
-{
- struct igmp_group *group = igmp_group_list;
-
- while (group != NULL) {
- if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
- return group;
- }
- group = group->next;
- }
-
- /* to be clearer, we return NULL here instead of
- * 'group' (which is also NULL at this point).
- */
- return NULL;
-}
-
-/**
- * Search for a specific igmp group and create a new one if not found-
- *
- * @param ifp the network interface for which to look
- * @param addr the group ip address to search
- * @return a struct igmp_group*,
- * NULL on memory error.
- */
-struct igmp_group *
-igmp_lookup_group(struct netif *ifp, ip_addr_t *addr)
-{
- struct igmp_group *group = igmp_group_list;
-
- /* Search if the group already exists */
- group = igmp_lookfor_group(ifp, addr);
- if (group != NULL) {
- /* Group already exists. */
- return group;
- }
-
- /* Group doesn't exist yet, create a new one */
- group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
- if (group != NULL) {
- group->netif = ifp;
- ip_addr_set(&(group->group_address), addr);
- group->timer = 0; /* Not running */
- group->group_state = IGMP_GROUP_NON_MEMBER;
- group->last_reporter_flag = 0;
- group->use = 0;
- group->next = igmp_group_list;
-
- igmp_group_list = group;
- }
-
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
- ip_addr_debug_print(IGMP_DEBUG, addr);
- LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
-
- return group;
-}
-
-/**
- * Remove a group in the global igmp_group_list
- *
- * @param group the group to remove from the global igmp_group_list
- * @return ERR_OK if group was removed from the list, an err_t otherwise
- */
-static err_t
-igmp_remove_group(struct igmp_group *group)
-{
- err_t err = ERR_OK;
-
- /* Is it the first group? */
- if (igmp_group_list == group) {
- igmp_group_list = group->next;
- } else {
- /* look for group further down the list */
- struct igmp_group *tmpGroup;
- for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
- if (tmpGroup->next == group) {
- tmpGroup->next = group->next;
- break;
- }
- }
- /* Group not found in the global igmp_group_list */
- if (tmpGroup == NULL)
- err = ERR_ARG;
- }
- /* free group */
- memp_free(MEMP_IGMP_GROUP, group);
-
- return err;
-}
-
-/**
- * Called from ip_input() if a new IGMP packet is received.
- *
- * @param p received igmp packet, p->payload pointing to the ip header
- * @param inp network interface on which the packet was received
- * @param dest destination ip address of the igmp packet
- */
-void
-igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest)
-{
- struct ip_hdr * iphdr;
- struct igmp_msg* igmp;
- struct igmp_group* group;
- struct igmp_group* groupref;
-
- IGMP_STATS_INC(igmp.recv);
-
- /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
- iphdr = (struct ip_hdr *)p->payload;
- if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
- pbuf_free(p);
- IGMP_STATS_INC(igmp.lenerr);
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
- return;
- }
-
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
- ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
- LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
- ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
- LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
-
- /* Now calculate and check the checksum */
- igmp = (struct igmp_msg *)p->payload;
- if (inet_chksum(igmp, p->len)) {
- pbuf_free(p);
- IGMP_STATS_INC(igmp.chkerr);
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
- return;
- }
-
- /* Packet is ok so find an existing group */
- group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
-
- /* If group can be found or create... */
- if (!group) {
- pbuf_free(p);
- IGMP_STATS_INC(igmp.drop);
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
- return;
- }
-
- /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
- switch (igmp->igmp_msgtype) {
- case IGMP_MEMB_QUERY: {
- /* IGMP_MEMB_QUERY to the "all systems" address ? */
- if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
- /* THIS IS THE GENERAL QUERY */
- 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)));
-
- if (igmp->igmp_maxresp == 0) {
- IGMP_STATS_INC(igmp.rx_v1);
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
- igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
- } else {
- IGMP_STATS_INC(igmp.rx_general);
- }
-
- groupref = igmp_group_list;
- while (groupref) {
- /* Do not send messages on the all systems group address! */
- if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
- igmp_delaying_member(groupref, igmp->igmp_maxresp);
- }
- groupref = groupref->next;
- }
- } else {
- /* IGMP_MEMB_QUERY to a specific group ? */
- if (!ip_addr_isany(&igmp->igmp_group_address)) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
- ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
- if (ip_addr_cmp(dest, &allsystems)) {
- ip_addr_t groupaddr;
- LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
- /* we first need to re-look for the group since we used dest last time */
- ip_addr_copy(groupaddr, igmp->igmp_group_address);
- group = igmp_lookfor_group(inp, &groupaddr);
- } else {
- LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
- }
-
- if (group != NULL) {
- IGMP_STATS_INC(igmp.rx_group);
- igmp_delaying_member(group, igmp->igmp_maxresp);
- } else {
- IGMP_STATS_INC(igmp.drop);
- }
- } else {
- IGMP_STATS_INC(igmp.proterr);
- }
- }
- break;
- }
- case IGMP_V2_MEMB_REPORT: {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
- IGMP_STATS_INC(igmp.rx_report);
- if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
- /* This is on a specific group we have already looked up */
- group->timer = 0; /* stopped */
- group->group_state = IGMP_GROUP_IDLE_MEMBER;
- group->last_reporter_flag = 0;
- }
- break;
- }
- default: {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
- igmp->igmp_msgtype, group->group_state, &group, group->netif));
- IGMP_STATS_INC(igmp.proterr);
- break;
- }
- }
-
- pbuf_free(p);
- return;
-}
-
-/**
- * Join a group on one network interface.
- *
- * @param ifaddr ip address of the network interface which should join a new group
- * @param groupaddr the ip address of the group which to join
- * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
- */
-err_t
-igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
-{
- err_t err = ERR_VAL; /* no matching interface */
- struct igmp_group *group;
- struct netif *netif;
-
- /* make sure it is multicast address */
- LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
- LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
-
- /* loop through netif's */
- netif = netif_list;
- while (netif != NULL) {
- /* Should we join this interface ? */
- if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
- /* find group or create a new one if not found */
- group = igmp_lookup_group(netif, groupaddr);
-
- if (group != NULL) {
- /* This should create a new group, check the state to make sure */
- if (group->group_state != IGMP_GROUP_NON_MEMBER) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
- } else {
- /* OK - it was new group */
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
- ip_addr_debug_print(IGMP_DEBUG, groupaddr);
- LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
-
- /* If first use of the group, allow the group at the MAC level */
- if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
- ip_addr_debug_print(IGMP_DEBUG, groupaddr);
- LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
- netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
- }
-
- IGMP_STATS_INC(igmp.tx_join);
- igmp_send(group, IGMP_V2_MEMB_REPORT);
-
- igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
-
- /* Need to work out where this timer comes from */
- group->group_state = IGMP_GROUP_DELAYING_MEMBER;
- }
- /* Increment group use */
- group->use++;
- /* Join on this interface */
- err = ERR_OK;
- } else {
- /* Return an error even if some network interfaces are joined */
- /** @todo undo any other netif already joined */
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
- return ERR_MEM;
- }
- }
- /* proceed to next network interface */
- netif = netif->next;
- }
-
- return err;
-}
-
-/**
- * Leave a group on one network interface.
- *
- * @param ifaddr ip address of the network interface which should leave a group
- * @param groupaddr the ip address of the group which to leave
- * @return ERR_OK if group was left on the netif(s), an err_t otherwise
- */
-err_t
-igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
-{
- err_t err = ERR_VAL; /* no matching interface */
- struct igmp_group *group;
- struct netif *netif;
-
- /* make sure it is multicast address */
- LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
- LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
-
- /* loop through netif's */
- netif = netif_list;
- while (netif != NULL) {
- /* Should we leave this interface ? */
- if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
- /* find group */
- group = igmp_lookfor_group(netif, groupaddr);
-
- if (group != NULL) {
- /* Only send a leave if the flag is set according to the state diagram */
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
- ip_addr_debug_print(IGMP_DEBUG, groupaddr);
- LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
-
- /* If there is no other use of the group */
- if (group->use <= 1) {
- /* If we are the last reporter for this group */
- if (group->last_reporter_flag) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
- IGMP_STATS_INC(igmp.tx_leave);
- igmp_send(group, IGMP_LEAVE_GROUP);
- }
-
- /* Disable the group at the MAC level */
- if (netif->igmp_mac_filter != NULL) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
- ip_addr_debug_print(IGMP_DEBUG, groupaddr);
- LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
- netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
- }
-
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
- ip_addr_debug_print(IGMP_DEBUG, groupaddr);
- LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
-
- /* Free the group */
- igmp_remove_group(group);
- } else {
- /* Decrement group use */
- group->use--;
- }
- /* Leave on this interface */
- err = ERR_OK;
- } else {
- /* It's not a fatal error on "leavegroup" */
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
- }
- }
- /* proceed to next network interface */
- netif = netif->next;
- }
-
- return err;
-}
-
-/**
- * The igmp timer function (both for NO_SYS=1 and =0)
- * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
- */
-void
-igmp_tmr(void)
-{
- struct igmp_group *group = igmp_group_list;
-
- while (group != NULL) {
- if (group->timer > 0) {
- group->timer--;
- if (group->timer == 0) {
- igmp_timeout(group);
- }
- }
- group = group->next;
- }
-}
-
-/**
- * Called if a timeout for one group is reached.
- * Sends a report for this group.
- *
- * @param group an igmp_group for which a timeout is reached
- */
-static void
-igmp_timeout(struct igmp_group *group)
-{
- /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
- if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
- ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
- LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
-
- IGMP_STATS_INC(igmp.tx_report);
- igmp_send(group, IGMP_V2_MEMB_REPORT);
- }
-}
-
-/**
- * Start a timer for an igmp group
- *
- * @param group the igmp_group for which to start a timer
- * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
- * every call to igmp_tmr())
- */
-static void
-igmp_start_timer(struct igmp_group *group, u8_t max_time)
-{
- /* ensure the input value is > 0 */
- if (max_time == 0) {
- max_time = 1;
- }
- /* ensure the random value is > 0 */
- group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
-}
-
-/**
- * Stop a timer for an igmp_group
- *
- * @param group the igmp_group for which to stop the timer
- */
-static void
-igmp_stop_timer(struct igmp_group *group)
-{
- group->timer = 0;
-}
-
-/**
- * Delaying membership report for a group if necessary
- *
- * @param group the igmp_group for which "delaying" membership report
- * @param maxresp query delay
- */
-static void
-igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
-{
- if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
- ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
- ((group->timer == 0) || (maxresp < group->timer)))) {
- igmp_start_timer(group, maxresp);
- group->group_state = IGMP_GROUP_DELAYING_MEMBER;
- }
-}
-
-
-/**
- * Sends an IP packet on a network interface. This function constructs the IP header
- * and calculates the IP header checksum. If the source IP address is NULL,
- * the IP address of the outgoing network interface is filled in as source address.
- *
- * @param p the packet to send (p->payload points to the data, e.g. next
- protocol header; if dest == IP_HDRINCL, p already includes an IP
- header and p->payload points to that IP header)
- * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
- * IP address of the netif used to send is used as source address)
- * @param dest the destination IP address to send the packet to
- * @param ttl the TTL value to be set in the IP header
- * @param proto the PROTOCOL to be set in the IP header
- * @param netif the netif on which to send this packet
- * @return ERR_OK if the packet was sent OK
- * ERR_BUF if p doesn't have enough space for IP/LINK headers
- * returns errors returned by netif->output
- */
-static err_t
-igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif)
-{
- /* This is the "router alert" option */
- u16_t ra[2];
- ra[0] = PP_HTONS(ROUTER_ALERT);
- ra[1] = 0x0000; /* Router shall examine packet */
- IGMP_STATS_INC(igmp.xmit);
- return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
-}
-
-/**
- * Send an igmp packet to a specific group.
- *
- * @param group the group to which to send the packet
- * @param type the type of igmp packet to send
- */
-static void
-igmp_send(struct igmp_group *group, u8_t type)
-{
- struct pbuf* p = NULL;
- struct igmp_msg* igmp = NULL;
- ip_addr_t src = *IP_ADDR_ANY;
- ip_addr_t* dest = NULL;
-
- /* IP header + "router alert" option + IGMP header */
- p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
-
- if (p) {
- igmp = (struct igmp_msg *)p->payload;
- LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
- (p->len >= sizeof(struct igmp_msg)));
- ip_addr_copy(src, group->netif->ip_addr);
-
- if (type == IGMP_V2_MEMB_REPORT) {
- dest = &(group->group_address);
- ip_addr_copy(igmp->igmp_group_address, group->group_address);
- group->last_reporter_flag = 1; /* Remember we were the last to report */
- } else {
- if (type == IGMP_LEAVE_GROUP) {
- dest = &allrouters;
- ip_addr_copy(igmp->igmp_group_address, group->group_address);
- }
- }
-
- if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
- igmp->igmp_msgtype = type;
- igmp->igmp_maxresp = 0;
- igmp->igmp_checksum = 0;
- igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
-
- igmp_ip_output_if(p, &src, dest, group->netif);
- }
-
- pbuf_free(p);
- } else {
- LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
- IGMP_STATS_INC(igmp.memerr);
- }
-}
-
-#endif /* LWIP_IGMP */