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Add igmp.h and igmp.c inside tree :

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src/core/ipv4/igmp.c
src/include/ipv4/lwip/igmp.h
This commit is contained in:
fbernon 2007-03-11 19:45:32 +00:00
parent a24a170b84
commit 1af676385c
2 changed files with 672 additions and 0 deletions
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src/core/ipv4/igmp.c Normal file
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/*
* 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.
*/
/************************************************************
In the spirit of LW (I hope)
-------------------------------------------------------------
note 1)
Although the rfc requires V1 AND V2 capability
we will only support v2 since now V1 is 5 years old
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
------------------------------------------------------------*/
/*-----------------------------------------------------------------------------
* Includes
*----------------------------------------------------------------------------*/
#include "lwip/debug.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/ip.h"
#include "lwip/inet.h"
#include "lwip/netif.h"
#include "lwip/icmp.h"
#include "lwip/udp.h"
#include "lwip/tcp.h"
#include "lwip/stats.h"
#include "lwip/igmp.h"
#include "arch/perf.h"
#include "arch/PNX_if.h"
#include "string.h"
/* IGMP support available? */
#if defined(LWIP_IGMP) && (LWIP_IGMP > 0)
/*-----------------------------------------------------------------------------
* Globales
*----------------------------------------------------------------------------*/
struct igmp_group* GroupList;
struct igmp_stats igmpstats;
struct ip_addr allsystems;
struct ip_addr allrouters;
/*-----------------------------------------------------------------------------
* igmp_init
*----------------------------------------------------------------------------*/
void igmp_init(void)
{ struct igmp_group* group;
struct netif* netif;
LWIP_DEBUGF(IGMP_DEBUG, ("IGMP Initialising\n"));
IP4_ADDR (&allsystems, 224, 0, 0, 1);
IP4_ADDR (&allrouters, 224, 0, 0, 2);
GroupList = NULL;
memset( &igmpstats, 0, sizeof(igmpstats));
for( netif = netif_list; netif != NULL; netif = netif->next)
{ group = lookup_group (netif, &allsystems);
if (group)
{ group->group_state = IDLE_MEMBER;
// Allow the igmp messages at the MAC level
if (netif->igmp_mac_filter!=NULL)
{ netif->igmp_mac_filter( netif, &allsystems, IGMP_ADD_MAC_FILTER);
netif->igmp_mac_filter( netif, &allrouters, IGMP_ADD_MAC_FILTER);
}
}
}
// Start the 10 millisecond tick
// we can optimise this to only run when timers are active later on
sys_timeout( IGMP_TICK, igmp_tick, NULL);
}
/*-----------------------------------------------------------------------------
* lookfor_group
*----------------------------------------------------------------------------*/
struct igmp_group * lookfor_group( struct netif *ifp, struct ip_addr *addr)
{ struct igmp_group *group = GroupList;
while (group)
{ if ((group->interface == ifp) && (ip_addr_cmp (&(group->group_address), addr)))
{ return group;
}
group = group->next;
}
return group;
}
/*-----------------------------------------------------------------------------
* lookup_group
*----------------------------------------------------------------------------*/
struct igmp_group * lookup_group( struct netif *ifp, struct ip_addr *addr)
{ struct igmp_group *group = GroupList;
while (group)
{ if ((group->interface == ifp) && (ip_addr_cmp (&(group->group_address), addr)))
{ return group;
}
group = group->next;
}
group = mem_malloc (sizeof (struct igmp_group));
if (group)
{ group->interface = ifp;
ip_addr_set (&(group->group_address), addr);
group->timer = 0; // Not running
group->group_state = NON_MEMBER;
group->last_reporter_flag = 0;
group->next = GroupList;
GroupList = group;
LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %d allocated a new group with address %x on if %x \n", __LINE__, (int) addr, (int) ifp));
}
else
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %d impossible to allocated a new group with address %x on if %x \n", __LINE__, (int) addr, (int) ifp));
}
return group;
}
/*-----------------------------------------------------------------------------
* igmp_input
*----------------------------------------------------------------------------*/
void igmp_input( struct pbuf *p, struct netif *inp, struct ip_addr *dest)
{ struct ip_hdr * iphdr;
struct igmpmsg* igmp;
struct igmp_group* group;
struct igmp_group* groupref;
iphdr = p->payload;
igmp = (struct igmpmsg *)(((u8_t *)p->payload)+((u32_t)(IPH_HL(iphdr) * 4)));
LWIP_DEBUGF(IGMP_DEBUG, ("igmp message to address %l \n", (long) dest->addr));
if (p->len < IGMP_MINLEN)
{ // Nore that the length CAN be greater than 8 but only 8 are used - All are included in the checksum
pbuf_free (p);
igmpstats.igmp_length_err++;
LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %x igmp length error\n", __LINE__));
return;
}
// Now calculate and check the checksum
if (inet_chksum (igmp, IGMP_MINLEN /*p->len*/))
{ pbuf_free (p);
igmpstats.igmp_checksum_err++;
LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %d igmp checksum error\n", __LINE__));
return;
}
// Packet is ok so find the group (or create a new one)
group = lookup_group (inp, dest); // use the incoming IP address!
// If group can be found or create...
if (!group)
{ pbuf_free (p);
LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %d igmp allocation error\n", __LINE__));
return;
}
// NOW ACT ON THE INCOMING MESSAGE TYPE...
// The membership query message goes to the all groups address
// and it control block does not have state
if ((IGMP_MEMB_QUERY == igmp->igmp_msgtype) && (ip_addr_cmp (dest, &allsystems)) && (igmp->igmp_group_address.addr == 0))
{ // THIS IS THE GENERAL QUERY
LWIP_DEBUGF(IGMP_DEBUG, ("General IGMP_MEMB_QUERY on ALL SYSTEMS ADDRESS 224.0.0.1\n"));
if (0 ==igmp->igmp_maxresp )
{ igmpstats.igmp_v1_rxed++;
igmp->igmp_maxresp = 10;
LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %d got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n", __LINE__));
}
igmpstats.igmp_group_query_rxed++;
groupref = GroupList;
while (groupref)
{ if ((groupref->interface == inp) && (!(ip_addr_cmp (&(groupref->group_address), &allsystems))))
{ // Do not send messages on the all systems group address!
if ((groupref->group_state == IDLE_MEMBER) || ((groupref->group_state == DELAYING_MEMBER) && (igmp->igmp_maxresp > groupref->timer)))
{ igmp_start_timer (groupref, (igmp->igmp_maxresp)/2);
groupref->group_state = DELAYING_MEMBER;
}
}
groupref = groupref->next;
}
}
else
if ((IGMP_MEMB_QUERY == igmp->igmp_msgtype) && ip_addr_cmp (dest, &allsystems) && (group->group_address.addr != 0))
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %x got a query to a specific group using the allsystems address \n", __LINE__));
// we first need to re-lookup the group since we used dest last time
group = lookup_group (inp, &igmp->igmp_group_address); // use the incoming IP address!
igmpstats.igmp_unicast_query++;
if ((IDLE_MEMBER == group->group_state ) || ((DELAYING_MEMBER == group->group_state ) && (igmp->igmp_maxresp > group->timer)))
{ igmp_start_timer (group, (igmp->igmp_maxresp)/2);
group->group_state = DELAYING_MEMBER;
}
}
else
if ((IGMP_MEMB_QUERY == igmp->igmp_msgtype) && !(ip_addr_cmp (dest, &allsystems)) && (group->group_address.addr != 0))
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %x got a query to a specific group with the group address as destination \n", __LINE__));
igmpstats.igmp_unicast_query++; /* This is the unicast query */
if ((IDLE_MEMBER == group->group_state ) || ((DELAYING_MEMBER == group->group_state ) && (igmp->igmp_maxresp > group->timer)))
{ igmp_start_timer (group, (igmp->igmp_maxresp)/2);
group->group_state = DELAYING_MEMBER;
}
}
else
if (IGMP_V2_MEMB_REPORT == igmp->igmp_msgtype )
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c,Line %x got an IGMP_V2_MEMB_REPORT \n", __LINE__));
igmpstats.report_rxed++;
if (DELAYING_MEMBER == group->group_state )
{ // This is on a specific group we have already looked up
group->timer = 0; //stopped
group->group_state = IDLE_MEMBER;
group->last_reporter_flag = 0;
}
}
else
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input, Line %x unexpected msg %x in state %x on group %x at interface %x\n", __LINE__, (int) igmp->igmp_msgtype, (int) group->group_state, (int) &group, (int) group->interface));
}
pbuf_free (p);
return;
}
/*-----------------------------------------------------------------------------
* igmp_joingroup
*----------------------------------------------------------------------------*/
err_t igmp_joingroup( struct netif *ifp, struct ip_addr *groupaddr)
{ struct igmp_group *group;
group = lookup_group (ifp, groupaddr);
if (group)
{ // This should create a new group, check the state to make sure
if (group->group_state != NON_MEMBER)
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c Line %x join to group not in state NON_MEMBER\n", __LINE__));
return ERR_OK;
}
// OK - it was new group
igmpstats.igmp_joins++;
LWIP_DEBUGF(IGMP_DEBUG, ("igmp join to new group\n"));
if (ifp->igmp_mac_filter!=NULL)
{ ifp->igmp_mac_filter( ifp, groupaddr, IGMP_ADD_MAC_FILTER);
}
igmp_send( group, IGMP_V2_MEMB_REPORT);
igmp_start_timer( group, 5);
// Need to work out where this timer comes from
group->group_state = DELAYING_MEMBER;
return ERR_OK;
}
return ERR_MEM;
}
/*-----------------------------------------------------------------------------
* igmp_leavegroup
*----------------------------------------------------------------------------*/
err_t igmp_leavegroup( struct netif *ifp, struct ip_addr *groupaddr)
{ struct igmp_group *group;
group = lookup_group (ifp, groupaddr);
if (group)
{ // Only send a leave if the flag is set according to the state diagram
if (group->last_reporter_flag)
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c Line %x Leaving group\n", __LINE__));
igmpstats.igmp_leave_sent++;
igmp_send( group, IGMP_LEAVE_GROUP);
}
// The block is not deleted since the group still exists and we may rejoin
group->last_reporter_flag = 0;
group->group_state = NON_MEMBER;
group->timer = 0;
if (ifp->igmp_mac_filter!=NULL)
{ ifp->igmp_mac_filter( ifp, groupaddr, IGMP_DEL_MAC_FILTER);
}
return ERR_OK;
}
return ERR_MEM;
}
/*-----------------------------------------------------------------------------
* igmp_tick
*----------------------------------------------------------------------------*/
void igmp_tick(void *arg)
{ struct igmp_group *group = GroupList;
arg = arg;
while (group)
{ if (group->timer != 0)
{ group->timer -=1;
if (group->timer == 0)
{ igmp_timeout (group);
}
}
group = group->next;
}
// 100 millisecond tick handler
// go down the list of all groups here and check for timeouts
sys_timeout (IGMP_TICK, igmp_tick, NULL);
}
/*-----------------------------------------------------------------------------
* igmp_timeout
*----------------------------------------------------------------------------*/
void igmp_timeout( struct igmp_group *group)
{ // If the state is DELAYING_MEMBER then we send a report for this group
LWIP_DEBUGF(IGMP_DEBUG, ("igmp.c, got a timeout\n"));
if (DELAYING_MEMBER == group->group_state)
{ igmp_send( group, IGMP_V2_MEMB_REPORT);
}
}
/*-----------------------------------------------------------------------------
* igmp_start_timer
*----------------------------------------------------------------------------*/
void igmp_start_timer( struct igmp_group *group, u8_t max_time)
{ // Important !! this should be random 0 -> max_time
// find out how to do this
group->timer = max_time;
}
/*-----------------------------------------------------------------------------
* igmp_stop_timer
*----------------------------------------------------------------------------*/
void igmp_stop_timer( struct igmp_group *group)
{ group->timer = 0;
}
/*-----------------------------------------------------------------------------
* igmp_ip_output_if
* 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.
*----------------------------------------------------------------------------*/
err_t igmp_ip_output_if( struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, u8_t ttl, u8_t proto, struct netif *netif)
{ static struct ip_hdr * iphdr = NULL;
static u16_t ip_id = 0;
u16_t * ra = NULL;
// First write in the "router alert"
if (pbuf_header (p, ROUTER_ALERTLEN))
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: not enough room for IP header in pbuf\n"));
return ERR_BUF;
}
// This is the "router alert" option
ra = p->payload;
ra[0] = htons (0x9404);
ra[1] = 0x0000;
// now the normal ip header
if (pbuf_header (p, IP_HLEN))
{ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_ip_output_if: not enough room for IP header in pbuf\n"));
return ERR_BUF;
}
iphdr = p->payload;
if (dest != IP_HDRINCL)
{ iphdr->_ttl_proto = (proto<<8);
iphdr->_ttl_proto |= ttl;
/* iphdr->dest = dest->addr; */
ip_addr_set (&(iphdr->dest), dest);
#ifdef HAVE_BITFIELDS
iphdr->_v_hl_tos |= ((IP_HLEN+ ROUTER_ALERTLEN)/4)<<16;
iphdr->_v_hl_tos |= 4<<24;
#else
iphdr->_v_hl_tos = (4 << 4) | ((IP_HLEN + ROUTER_ALERTLEN)/ 4 & 0xf);
#endif /* HAVE_BITFIELDS */
iphdr->_v_hl_tos |= 0;
iphdr->_len = htons (p->tot_len);
iphdr->_offset = htons (0);
iphdr->_id = htons (ip_id++);
if (ip_addr_isany (src))
{ ip_addr_set (&(iphdr->src), &(netif->ip_addr));
}
else
{ ip_addr_set (&(iphdr->src), src);
}
iphdr->_chksum = 0;
iphdr->_chksum = inet_chksum (iphdr, IP_HLEN + ROUTER_ALERTLEN);
}
else
{ dest = &(iphdr->dest);
}
#if IP_DEBUG
ip_debug_print (p);
#endif
LWIP_DEBUGF(IGMP_DEBUG, ("IGMP sending to netif %x \n", (int) netif));
return netif->output (netif, p, dest);
}
/*-----------------------------------------------------------------------------
* igmp_send
*----------------------------------------------------------------------------*/
void igmp_send( struct igmp_group *group, u8_t type)
{ struct pbuf* p = NULL;
struct igmpmsg* igmp = NULL;
struct ip_addr src = {0};
struct ip_addr* dest = NULL;
/* IP header + IGMP header */
p = pbuf_alloc( PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
if (p)
{ igmp = p->payload;
ip_addr_set (&src, &((group->interface)->ip_addr));
if (IGMP_V2_MEMB_REPORT == type)
{ dest = &(group->group_address);
igmpstats.report_sent++;
ip_addr_set (&(igmp->igmp_group_address), &(group->group_address));
group->last_reporter_flag = 1; // Remember we were the last to report
}
else
if (IGMP_LEAVE_GROUP == type)
{ dest = &allrouters;
ip_addr_set (&(igmp->igmp_group_address), &(group->group_address));
}
if ((IGMP_V2_MEMB_REPORT == type) || (IGMP_LEAVE_GROUP == type))
{ 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, IGMP_TTL, IP_PROTO_IGMP, group->interface);
}
pbuf_free (p);
}
else
{ LWIP_DEBUGF(IGMP_DEBUG, ("IGMP, not enough memory for igmp_send\n"));
}
}
#endif /* LWIP_IGMP */

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src/include/ipv4/lwip/igmp.h Normal file
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/*
* 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.
*/
#ifndef IGMPH
#define IGMPH
/* IGMP support available? */
#if defined(LWIP_IGMP) && (LWIP_IGMP > 0)
// Some routers are not happy with ROUTER ALERT make it defineable, 1 to enable
#define USE_ROUTER_ALERT 0
/*
* IGMP packet format.
*/
struct igmpmsg {
u8_t igmp_msgtype;
u8_t igmp_maxresp;
u16_t igmp_checksum;
struct ip_addr igmp_group_address;
};
#define MCAST224 224
#define ALLROUTERS_GROUP 224,0,0,2
#define IGMP_MINLEN 8
/*
* 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 */
// Timer
#define IGMP_TICK 100 // Milliseconds
// MAC Filter Actions
#define IGMP_DEL_MAC_FILTER 0
#define IGMP_ADD_MAC_FILTER 1
// Group membership states
#define NON_MEMBER 0
#define DELAYING_MEMBER 1
#define IDLE_MEMBER 2
// Put this is another place when integrated
#define IP_PROTO_IGMP 2
#define IGMP_TTL 1
#define ROUTER_ALERTLEN 4
/*
* now a group structure - there is
* a list of groups for each interface
* these should really be linked from the interface, but
* if we keep them separate we will not affect the lwip original code
* too much
*
* There will be a group for the all systems group address but this
* will not run the state machine as it is used to kick off reports
* from all the other groups
*/
struct igmp_group {
struct igmp_group *next;
struct netif *interface;
struct ip_addr group_address;
u8_t last_reporter_flag; // signifies we were the last person to report
u8_t group_state;
u16_t timer;
};
struct igmp_stats{
u32_t igmp_length_err;
u32_t igmp_checksum_err;
u32_t igmp_v1_rxed;
u32_t igmp_joins;
u32_t igmp_leave_sent;
u32_t igmp_unicast_query;
u32_t report_sent;
u32_t igmp_group_query_rxed;
u32_t report_rxed;
};
// Prototypes
void igmp_init(void);
struct igmp_group *lookfor_group(struct netif *ifp, struct ip_addr *addr);
struct igmp_group *lookup_group(struct netif *ifp, struct ip_addr *addr);
void igmp_input( struct pbuf *p, struct netif *inp, struct ip_addr *dest);
err_t igmp_joingroup( struct netif* ifp, struct ip_addr *groupaddr);
err_t igmp_leavegroup( struct netif* ifp, struct ip_addr *groupaddr);
void igmp_tick();
void igmp_timeout( struct igmp_group *group);
void igmp_start_timer( struct igmp_group *group,u8_t max_time);
void igmp_stop_timer( struct igmp_group *group);
err_t igmp_ip_output_if( struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, u8_t ttl, u8_t proto, struct netif *netif);
void igmp_send( struct igmp_group *group, u8_t type);
#endif /* LWIP_IGMP */
#endif /* IGMPH */