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This library is stripped down version of NetServices library. HTTP server and client function is NOT supported.

lwip/core/ipv4/igmp.c@0:dcf3c92487ca, 2011-07-20 (annotated)

Committer:: idinor
Date:: Wed Jul 20 11:45:39 2011 +0000
Revision:: 0:dcf3c92487ca

Who changed what in which revision?

User	Revision	Line number	New contents of line
idinor	0:dcf3c92487ca	1	#pragma diag_remark 177
idinor	0:dcf3c92487ca	2	/**
idinor	0:dcf3c92487ca	3	* @file
idinor	0:dcf3c92487ca	4	* IGMP - Internet Group Management Protocol
idinor	0:dcf3c92487ca	5	*
idinor	0:dcf3c92487ca	6	*/
idinor	0:dcf3c92487ca	7
idinor	0:dcf3c92487ca	8	/*
idinor	0:dcf3c92487ca	9	* Copyright (c) 2002 CITEL Technologies Ltd.
idinor	0:dcf3c92487ca	10	* All rights reserved.
idinor	0:dcf3c92487ca	11	*
idinor	0:dcf3c92487ca	12	* Redistribution and use in source and binary forms, with or without
idinor	0:dcf3c92487ca	13	* modification, are permitted provided that the following conditions
idinor	0:dcf3c92487ca	14	* are met:
idinor	0:dcf3c92487ca	15	* 1. Redistributions of source code must retain the above copyright
idinor	0:dcf3c92487ca	16	* notice, this list of conditions and the following disclaimer.
idinor	0:dcf3c92487ca	17	* 2. Redistributions in binary form must reproduce the above copyright
idinor	0:dcf3c92487ca	18	* notice, this list of conditions and the following disclaimer in the
idinor	0:dcf3c92487ca	19	* documentation and/or other materials provided with the distribution.
idinor	0:dcf3c92487ca	20	* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
idinor	0:dcf3c92487ca	21	* may be used to endorse or promote products derived from this software
idinor	0:dcf3c92487ca	22	* without specific prior written permission.
idinor	0:dcf3c92487ca	23	*
idinor	0:dcf3c92487ca	24	* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
idinor	0:dcf3c92487ca	25	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
idinor	0:dcf3c92487ca	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
idinor	0:dcf3c92487ca	27	* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
idinor	0:dcf3c92487ca	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
idinor	0:dcf3c92487ca	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
idinor	0:dcf3c92487ca	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
idinor	0:dcf3c92487ca	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
idinor	0:dcf3c92487ca	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
idinor	0:dcf3c92487ca	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
idinor	0:dcf3c92487ca	34	* SUCH DAMAGE.
idinor	0:dcf3c92487ca	35	*
idinor	0:dcf3c92487ca	36	* This file is a contribution to the lwIP TCP/IP stack.
idinor	0:dcf3c92487ca	37	* The Swedish Institute of Computer Science and Adam Dunkels
idinor	0:dcf3c92487ca	38	* are specifically granted permission to redistribute this
idinor	0:dcf3c92487ca	39	* source code.
idinor	0:dcf3c92487ca	40	*/
idinor	0:dcf3c92487ca	41
idinor	0:dcf3c92487ca	42	/*-------------------------------------------------------------
idinor	0:dcf3c92487ca	43	Note 1)
idinor	0:dcf3c92487ca	44	Although the rfc requires V1 AND V2 capability
idinor	0:dcf3c92487ca	45	we will only support v2 since now V1 is very old (August 1989)
idinor	0:dcf3c92487ca	46	V1 can be added if required
idinor	0:dcf3c92487ca	47
idinor	0:dcf3c92487ca	48	a debug print and statistic have been implemented to
idinor	0:dcf3c92487ca	49	show this up.
idinor	0:dcf3c92487ca	50	-------------------------------------------------------------
idinor	0:dcf3c92487ca	51	-------------------------------------------------------------
idinor	0:dcf3c92487ca	52	Note 2)
idinor	0:dcf3c92487ca	53	A query for a specific group address (as opposed to ALLHOSTS)
idinor	0:dcf3c92487ca	54	has now been implemented as I am unsure if it is required
idinor	0:dcf3c92487ca	55
idinor	0:dcf3c92487ca	56	a debug print and statistic have been implemented to
idinor	0:dcf3c92487ca	57	show this up.
idinor	0:dcf3c92487ca	58	-------------------------------------------------------------
idinor	0:dcf3c92487ca	59	-------------------------------------------------------------
idinor	0:dcf3c92487ca	60	Note 3)
idinor	0:dcf3c92487ca	61	The router alert rfc 2113 is implemented in outgoing packets
idinor	0:dcf3c92487ca	62	but not checked rigorously incoming
idinor	0:dcf3c92487ca	63	-------------------------------------------------------------
idinor	0:dcf3c92487ca	64	Steve Reynolds
idinor	0:dcf3c92487ca	65	------------------------------------------------------------*/
idinor	0:dcf3c92487ca	66
idinor	0:dcf3c92487ca	67	/*-----------------------------------------------------------------------------
idinor	0:dcf3c92487ca	68	* RFC 988 - Host extensions for IP multicasting - V0
idinor	0:dcf3c92487ca	69	* RFC 1054 - Host extensions for IP multicasting -
idinor	0:dcf3c92487ca	70	* RFC 1112 - Host extensions for IP multicasting - V1
idinor	0:dcf3c92487ca	71	* RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
idinor	0:dcf3c92487ca	72	* RFC 3376 - Internet Group Management Protocol, Version 3 - V3
idinor	0:dcf3c92487ca	73	* RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
idinor	0:dcf3c92487ca	74	* RFC 2113 - IP Router Alert Option -
idinor	0:dcf3c92487ca	75	----------------------------------------------------------------------------/
idinor	0:dcf3c92487ca	76
idinor	0:dcf3c92487ca	77	/*-----------------------------------------------------------------------------
idinor	0:dcf3c92487ca	78	* Includes
idinor	0:dcf3c92487ca	79	----------------------------------------------------------------------------/
idinor	0:dcf3c92487ca	80
idinor	0:dcf3c92487ca	81	#include "lwip/opt.h"
idinor	0:dcf3c92487ca	82
idinor	0:dcf3c92487ca	83	#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
idinor	0:dcf3c92487ca	84
idinor	0:dcf3c92487ca	85	#include "lwip/igmp.h"
idinor	0:dcf3c92487ca	86	#include "lwip/debug.h"
idinor	0:dcf3c92487ca	87	#include "lwip/def.h"
idinor	0:dcf3c92487ca	88	#include "lwip/mem.h"
idinor	0:dcf3c92487ca	89	#include "lwip/ip.h"
idinor	0:dcf3c92487ca	90	#include "lwip/inet_chksum.h"
idinor	0:dcf3c92487ca	91	#include "lwip/netif.h"
idinor	0:dcf3c92487ca	92	#include "lwip/icmp.h"
idinor	0:dcf3c92487ca	93	#include "lwip/udp.h"
idinor	0:dcf3c92487ca	94	#include "lwip/tcp.h"
idinor	0:dcf3c92487ca	95	#include "lwip/stats.h"
idinor	0:dcf3c92487ca	96
idinor	0:dcf3c92487ca	97	#include "string.h"
idinor	0:dcf3c92487ca	98
idinor	0:dcf3c92487ca	99	/*
idinor	0:dcf3c92487ca	100	* IGMP constants
idinor	0:dcf3c92487ca	101	*/
idinor	0:dcf3c92487ca	102	#define IGMP_TTL 1
idinor	0:dcf3c92487ca	103	#define IGMP_MINLEN 8
idinor	0:dcf3c92487ca	104	#define ROUTER_ALERT 0x9404
idinor	0:dcf3c92487ca	105	#define ROUTER_ALERTLEN 4
idinor	0:dcf3c92487ca	106
idinor	0:dcf3c92487ca	107	/*
idinor	0:dcf3c92487ca	108	* IGMP message types, including version number.
idinor	0:dcf3c92487ca	109	*/
idinor	0:dcf3c92487ca	110	#define IGMP_MEMB_QUERY 0x11 /* Membership query */
idinor	0:dcf3c92487ca	111	#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
idinor	0:dcf3c92487ca	112	#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
idinor	0:dcf3c92487ca	113	#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
idinor	0:dcf3c92487ca	114
idinor	0:dcf3c92487ca	115	/* Group membership states */
idinor	0:dcf3c92487ca	116	#define IGMP_GROUP_NON_MEMBER 0
idinor	0:dcf3c92487ca	117	#define IGMP_GROUP_DELAYING_MEMBER 1
idinor	0:dcf3c92487ca	118	#define IGMP_GROUP_IDLE_MEMBER 2
idinor	0:dcf3c92487ca	119
idinor	0:dcf3c92487ca	120	/**
idinor	0:dcf3c92487ca	121	* IGMP packet format.
idinor	0:dcf3c92487ca	122	*/
idinor	0:dcf3c92487ca	123	#ifdef PACK_STRUCT_USE_INCLUDES
idinor	0:dcf3c92487ca	124	# include "arch/bpstruct.h"
idinor	0:dcf3c92487ca	125	#endif
idinor	0:dcf3c92487ca	126	PACK_STRUCT_BEGIN
idinor	0:dcf3c92487ca	127	struct igmp_msg {
idinor	0:dcf3c92487ca	128	PACK_STRUCT_FIELD(u8_t igmp_msgtype);
idinor	0:dcf3c92487ca	129	PACK_STRUCT_FIELD(u8_t igmp_maxresp);
idinor	0:dcf3c92487ca	130	PACK_STRUCT_FIELD(u16_t igmp_checksum);
idinor	0:dcf3c92487ca	131	PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
idinor	0:dcf3c92487ca	132	} PACK_STRUCT_STRUCT;
idinor	0:dcf3c92487ca	133	PACK_STRUCT_END
idinor	0:dcf3c92487ca	134	#ifdef PACK_STRUCT_USE_INCLUDES
idinor	0:dcf3c92487ca	135	# include "arch/epstruct.h"
idinor	0:dcf3c92487ca	136	#endif
idinor	0:dcf3c92487ca	137
idinor	0:dcf3c92487ca	138
idinor	0:dcf3c92487ca	139	static struct igmp_group igmp_lookup_group(struct netif ifp, ip_addr_t *addr);
idinor	0:dcf3c92487ca	140	static err_t igmp_remove_group(struct igmp_group *group);
idinor	0:dcf3c92487ca	141	static void igmp_timeout( struct igmp_group *group);
idinor	0:dcf3c92487ca	142	static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
idinor	0:dcf3c92487ca	143	static void igmp_stop_timer(struct igmp_group *group);
idinor	0:dcf3c92487ca	144	static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
idinor	0:dcf3c92487ca	145	static err_t igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif);
idinor	0:dcf3c92487ca	146	static void igmp_send(struct igmp_group *group, u8_t type);
idinor	0:dcf3c92487ca	147
idinor	0:dcf3c92487ca	148
idinor	0:dcf3c92487ca	149	static struct igmp_group* igmp_group_list;
idinor	0:dcf3c92487ca	150	static ip_addr_t allsystems;
idinor	0:dcf3c92487ca	151	static ip_addr_t allrouters;
idinor	0:dcf3c92487ca	152
idinor	0:dcf3c92487ca	153
idinor	0:dcf3c92487ca	154	/**
idinor	0:dcf3c92487ca	155	* Initialize the IGMP module
idinor	0:dcf3c92487ca	156	*/
idinor	0:dcf3c92487ca	157	void
idinor	0:dcf3c92487ca	158	igmp_init(void)
idinor	0:dcf3c92487ca	159	{
idinor	0:dcf3c92487ca	160	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
idinor	0:dcf3c92487ca	161
idinor	0:dcf3c92487ca	162	IP4_ADDR(&allsystems, 224, 0, 0, 1);
idinor	0:dcf3c92487ca	163	IP4_ADDR(&allrouters, 224, 0, 0, 2);
idinor	0:dcf3c92487ca	164	}
idinor	0:dcf3c92487ca	165
idinor	0:dcf3c92487ca	166	#ifdef LWIP_DEBUG
idinor	0:dcf3c92487ca	167	/**
idinor	0:dcf3c92487ca	168	* Dump global IGMP groups list
idinor	0:dcf3c92487ca	169	*/
idinor	0:dcf3c92487ca	170	void
idinor	0:dcf3c92487ca	171	igmp_dump_group_list()
idinor	0:dcf3c92487ca	172	{
idinor	0:dcf3c92487ca	173	struct igmp_group *group = igmp_group_list;
idinor	0:dcf3c92487ca	174
idinor	0:dcf3c92487ca	175	while (group != NULL) {
idinor	0:dcf3c92487ca	176	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
idinor	0:dcf3c92487ca	177	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
idinor	0:dcf3c92487ca	178	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
idinor	0:dcf3c92487ca	179	group = group->next;
idinor	0:dcf3c92487ca	180	}
idinor	0:dcf3c92487ca	181	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
idinor	0:dcf3c92487ca	182	}
idinor	0:dcf3c92487ca	183	#else
idinor	0:dcf3c92487ca	184	#define igmp_dump_group_list()
idinor	0:dcf3c92487ca	185	#endif /* LWIP_DEBUG */
idinor	0:dcf3c92487ca	186
idinor	0:dcf3c92487ca	187	/**
idinor	0:dcf3c92487ca	188	* Start IGMP processing on interface
idinor	0:dcf3c92487ca	189	*
idinor	0:dcf3c92487ca	190	* @param netif network interface on which start IGMP processing
idinor	0:dcf3c92487ca	191	*/
idinor	0:dcf3c92487ca	192	err_t
idinor	0:dcf3c92487ca	193	igmp_start(struct netif *netif)
idinor	0:dcf3c92487ca	194	{
idinor	0:dcf3c92487ca	195	struct igmp_group* group;
idinor	0:dcf3c92487ca	196
idinor	0:dcf3c92487ca	197	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
idinor	0:dcf3c92487ca	198
idinor	0:dcf3c92487ca	199	group = igmp_lookup_group(netif, &allsystems);
idinor	0:dcf3c92487ca	200
idinor	0:dcf3c92487ca	201	if (group != NULL) {
idinor	0:dcf3c92487ca	202	group->group_state = IGMP_GROUP_IDLE_MEMBER;
idinor	0:dcf3c92487ca	203	group->use++;
idinor	0:dcf3c92487ca	204
idinor	0:dcf3c92487ca	205	/* Allow the igmp messages at the MAC level */
idinor	0:dcf3c92487ca	206	if (netif->igmp_mac_filter != NULL) {
idinor	0:dcf3c92487ca	207	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
idinor	0:dcf3c92487ca	208	ip_addr_debug_print(IGMP_DEBUG, &allsystems);
idinor	0:dcf3c92487ca	209	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
idinor	0:dcf3c92487ca	210	netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
idinor	0:dcf3c92487ca	211	}
idinor	0:dcf3c92487ca	212
idinor	0:dcf3c92487ca	213	return ERR_OK;
idinor	0:dcf3c92487ca	214	}
idinor	0:dcf3c92487ca	215
idinor	0:dcf3c92487ca	216	return ERR_MEM;
idinor	0:dcf3c92487ca	217	}
idinor	0:dcf3c92487ca	218
idinor	0:dcf3c92487ca	219	/**
idinor	0:dcf3c92487ca	220	* Stop IGMP processing on interface
idinor	0:dcf3c92487ca	221	*
idinor	0:dcf3c92487ca	222	* @param netif network interface on which stop IGMP processing
idinor	0:dcf3c92487ca	223	*/
idinor	0:dcf3c92487ca	224	err_t
idinor	0:dcf3c92487ca	225	igmp_stop(struct netif *netif)
idinor	0:dcf3c92487ca	226	{
idinor	0:dcf3c92487ca	227	struct igmp_group *group = igmp_group_list;
idinor	0:dcf3c92487ca	228	struct igmp_group *prev = NULL;
idinor	0:dcf3c92487ca	229	struct igmp_group *next;
idinor	0:dcf3c92487ca	230
idinor	0:dcf3c92487ca	231	/* look for groups joined on this interface further down the list */
idinor	0:dcf3c92487ca	232	while (group != NULL) {
idinor	0:dcf3c92487ca	233	next = group->next;
idinor	0:dcf3c92487ca	234	/* is it a group joined on this interface? */
idinor	0:dcf3c92487ca	235	if (group->netif == netif) {
idinor	0:dcf3c92487ca	236	/* is it the first group of the list? */
idinor	0:dcf3c92487ca	237	if (group == igmp_group_list) {
idinor	0:dcf3c92487ca	238	igmp_group_list = next;
idinor	0:dcf3c92487ca	239	}
idinor	0:dcf3c92487ca	240	/* is there a "previous" group defined? */
idinor	0:dcf3c92487ca	241	if (prev != NULL) {
idinor	0:dcf3c92487ca	242	prev->next = next;
idinor	0:dcf3c92487ca	243	}
idinor	0:dcf3c92487ca	244	/* disable the group at the MAC level */
idinor	0:dcf3c92487ca	245	if (netif->igmp_mac_filter != NULL) {
idinor	0:dcf3c92487ca	246	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
idinor	0:dcf3c92487ca	247	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
idinor	0:dcf3c92487ca	248	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
idinor	0:dcf3c92487ca	249	netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
idinor	0:dcf3c92487ca	250	}
idinor	0:dcf3c92487ca	251	/* free group */
idinor	0:dcf3c92487ca	252	memp_free(MEMP_IGMP_GROUP, group);
idinor	0:dcf3c92487ca	253	} else {
idinor	0:dcf3c92487ca	254	/* change the "previous" */
idinor	0:dcf3c92487ca	255	prev = group;
idinor	0:dcf3c92487ca	256	}
idinor	0:dcf3c92487ca	257	/* move to "next" */
idinor	0:dcf3c92487ca	258	group = next;
idinor	0:dcf3c92487ca	259	}
idinor	0:dcf3c92487ca	260	return ERR_OK;
idinor	0:dcf3c92487ca	261	}
idinor	0:dcf3c92487ca	262
idinor	0:dcf3c92487ca	263	/**
idinor	0:dcf3c92487ca	264	* Report IGMP memberships for this interface
idinor	0:dcf3c92487ca	265	*
idinor	0:dcf3c92487ca	266	* @param netif network interface on which report IGMP memberships
idinor	0:dcf3c92487ca	267	*/
idinor	0:dcf3c92487ca	268	void
idinor	0:dcf3c92487ca	269	igmp_report_groups(struct netif *netif)
idinor	0:dcf3c92487ca	270	{
idinor	0:dcf3c92487ca	271	struct igmp_group *group = igmp_group_list;
idinor	0:dcf3c92487ca	272
idinor	0:dcf3c92487ca	273	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
idinor	0:dcf3c92487ca	274
idinor	0:dcf3c92487ca	275	while (group != NULL) {
idinor	0:dcf3c92487ca	276	if (group->netif == netif) {
idinor	0:dcf3c92487ca	277	igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
idinor	0:dcf3c92487ca	278	}
idinor	0:dcf3c92487ca	279	group = group->next;
idinor	0:dcf3c92487ca	280	}
idinor	0:dcf3c92487ca	281	}
idinor	0:dcf3c92487ca	282
idinor	0:dcf3c92487ca	283	/**
idinor	0:dcf3c92487ca	284	* Search for a group in the global igmp_group_list
idinor	0:dcf3c92487ca	285	*
idinor	0:dcf3c92487ca	286	* @param ifp the network interface for which to look
idinor	0:dcf3c92487ca	287	* @param addr the group ip address to search for
idinor	0:dcf3c92487ca	288	* @return a struct igmp_group* if the group has been found,
idinor	0:dcf3c92487ca	289	* NULL if the group wasn't found.
idinor	0:dcf3c92487ca	290	*/
idinor	0:dcf3c92487ca	291	struct igmp_group *
idinor	0:dcf3c92487ca	292	igmp_lookfor_group(struct netif ifp, ip_addr_t addr)
idinor	0:dcf3c92487ca	293	{
idinor	0:dcf3c92487ca	294	struct igmp_group *group = igmp_group_list;
idinor	0:dcf3c92487ca	295
idinor	0:dcf3c92487ca	296	while (group != NULL) {
idinor	0:dcf3c92487ca	297	if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
idinor	0:dcf3c92487ca	298	return group;
idinor	0:dcf3c92487ca	299	}
idinor	0:dcf3c92487ca	300	group = group->next;
idinor	0:dcf3c92487ca	301	}
idinor	0:dcf3c92487ca	302
idinor	0:dcf3c92487ca	303	/* to be clearer, we return NULL here instead of
idinor	0:dcf3c92487ca	304	* 'group' (which is also NULL at this point).
idinor	0:dcf3c92487ca	305	*/
idinor	0:dcf3c92487ca	306	return NULL;
idinor	0:dcf3c92487ca	307	}
idinor	0:dcf3c92487ca	308
idinor	0:dcf3c92487ca	309	/**
idinor	0:dcf3c92487ca	310	* Search for a specific igmp group and create a new one if not found-
idinor	0:dcf3c92487ca	311	*
idinor	0:dcf3c92487ca	312	* @param ifp the network interface for which to look
idinor	0:dcf3c92487ca	313	* @param addr the group ip address to search
idinor	0:dcf3c92487ca	314	* @return a struct igmp_group*,
idinor	0:dcf3c92487ca	315	* NULL on memory error.
idinor	0:dcf3c92487ca	316	*/
idinor	0:dcf3c92487ca	317	struct igmp_group *
idinor	0:dcf3c92487ca	318	igmp_lookup_group(struct netif ifp, ip_addr_t addr)
idinor	0:dcf3c92487ca	319	{
idinor	0:dcf3c92487ca	320	struct igmp_group *group = igmp_group_list;
idinor	0:dcf3c92487ca	321
idinor	0:dcf3c92487ca	322	/* Search if the group already exists */
idinor	0:dcf3c92487ca	323	group = igmp_lookfor_group(ifp, addr);
idinor	0:dcf3c92487ca	324	if (group != NULL) {
idinor	0:dcf3c92487ca	325	/* Group already exists. */
idinor	0:dcf3c92487ca	326	return group;
idinor	0:dcf3c92487ca	327	}
idinor	0:dcf3c92487ca	328
idinor	0:dcf3c92487ca	329	/* Group doesn't exist yet, create a new one */
idinor	0:dcf3c92487ca	330	group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
idinor	0:dcf3c92487ca	331	if (group != NULL) {
idinor	0:dcf3c92487ca	332	group->netif = ifp;
idinor	0:dcf3c92487ca	333	ip_addr_set(&(group->group_address), addr);
idinor	0:dcf3c92487ca	334	group->timer = 0; /* Not running */
idinor	0:dcf3c92487ca	335	group->group_state = IGMP_GROUP_NON_MEMBER;
idinor	0:dcf3c92487ca	336	group->last_reporter_flag = 0;
idinor	0:dcf3c92487ca	337	group->use = 0;
idinor	0:dcf3c92487ca	338	group->next = igmp_group_list;
idinor	0:dcf3c92487ca	339
idinor	0:dcf3c92487ca	340	igmp_group_list = group;
idinor	0:dcf3c92487ca	341	}
idinor	0:dcf3c92487ca	342
idinor	0:dcf3c92487ca	343	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
idinor	0:dcf3c92487ca	344	ip_addr_debug_print(IGMP_DEBUG, addr);
idinor	0:dcf3c92487ca	345	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
idinor	0:dcf3c92487ca	346
idinor	0:dcf3c92487ca	347	return group;
idinor	0:dcf3c92487ca	348	}
idinor	0:dcf3c92487ca	349
idinor	0:dcf3c92487ca	350	/**
idinor	0:dcf3c92487ca	351	* Remove a group in the global igmp_group_list
idinor	0:dcf3c92487ca	352	*
idinor	0:dcf3c92487ca	353	* @param group the group to remove from the global igmp_group_list
idinor	0:dcf3c92487ca	354	* @return ERR_OK if group was removed from the list, an err_t otherwise
idinor	0:dcf3c92487ca	355	*/
idinor	0:dcf3c92487ca	356	static err_t
idinor	0:dcf3c92487ca	357	igmp_remove_group(struct igmp_group *group)
idinor	0:dcf3c92487ca	358	{
idinor	0:dcf3c92487ca	359	err_t err = ERR_OK;
idinor	0:dcf3c92487ca	360
idinor	0:dcf3c92487ca	361	/* Is it the first group? */
idinor	0:dcf3c92487ca	362	if (igmp_group_list == group) {
idinor	0:dcf3c92487ca	363	igmp_group_list = group->next;
idinor	0:dcf3c92487ca	364	} else {
idinor	0:dcf3c92487ca	365	/* look for group further down the list */
idinor	0:dcf3c92487ca	366	struct igmp_group *tmpGroup;
idinor	0:dcf3c92487ca	367	for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
idinor	0:dcf3c92487ca	368	if (tmpGroup->next == group) {
idinor	0:dcf3c92487ca	369	tmpGroup->next = group->next;
idinor	0:dcf3c92487ca	370	break;
idinor	0:dcf3c92487ca	371	}
idinor	0:dcf3c92487ca	372	}
idinor	0:dcf3c92487ca	373	/* Group not found in the global igmp_group_list */
idinor	0:dcf3c92487ca	374	if (tmpGroup == NULL)
idinor	0:dcf3c92487ca	375	err = ERR_ARG;
idinor	0:dcf3c92487ca	376	}
idinor	0:dcf3c92487ca	377	/* free group */
idinor	0:dcf3c92487ca	378	memp_free(MEMP_IGMP_GROUP, group);
idinor	0:dcf3c92487ca	379
idinor	0:dcf3c92487ca	380	return err;
idinor	0:dcf3c92487ca	381	}
idinor	0:dcf3c92487ca	382
idinor	0:dcf3c92487ca	383	/**
idinor	0:dcf3c92487ca	384	* Called from ip_input() if a new IGMP packet is received.
idinor	0:dcf3c92487ca	385	*
idinor	0:dcf3c92487ca	386	* @param p received igmp packet, p->payload pointing to the ip header
idinor	0:dcf3c92487ca	387	* @param inp network interface on which the packet was received
idinor	0:dcf3c92487ca	388	* @param dest destination ip address of the igmp packet
idinor	0:dcf3c92487ca	389	*/
idinor	0:dcf3c92487ca	390	void
idinor	0:dcf3c92487ca	391	igmp_input(struct pbuf p, struct netif inp, ip_addr_t *dest)
idinor	0:dcf3c92487ca	392	{
idinor	0:dcf3c92487ca	393	struct ip_hdr * iphdr;
idinor	0:dcf3c92487ca	394	struct igmp_msg* igmp;
idinor	0:dcf3c92487ca	395	struct igmp_group* group;
idinor	0:dcf3c92487ca	396	struct igmp_group* groupref;
idinor	0:dcf3c92487ca	397
idinor	0:dcf3c92487ca	398	IGMP_STATS_INC(igmp.recv);
idinor	0:dcf3c92487ca	399
idinor	0:dcf3c92487ca	400	/* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
idinor	0:dcf3c92487ca	401	iphdr = (struct ip_hdr *)p->payload;
idinor	0:dcf3c92487ca	402	if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) \|\| (p->len < IGMP_MINLEN)) {
idinor	0:dcf3c92487ca	403	pbuf_free(p);
idinor	0:dcf3c92487ca	404	IGMP_STATS_INC(igmp.lenerr);
idinor	0:dcf3c92487ca	405	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
idinor	0:dcf3c92487ca	406	return;
idinor	0:dcf3c92487ca	407	}
idinor	0:dcf3c92487ca	408
idinor	0:dcf3c92487ca	409	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
idinor	0:dcf3c92487ca	410	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
idinor	0:dcf3c92487ca	411	LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
idinor	0:dcf3c92487ca	412	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
idinor	0:dcf3c92487ca	413	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
idinor	0:dcf3c92487ca	414
idinor	0:dcf3c92487ca	415	/* Now calculate and check the checksum */
idinor	0:dcf3c92487ca	416	igmp = (struct igmp_msg *)p->payload;
idinor	0:dcf3c92487ca	417	if (inet_chksum(igmp, p->len)) {
idinor	0:dcf3c92487ca	418	pbuf_free(p);
idinor	0:dcf3c92487ca	419	IGMP_STATS_INC(igmp.chkerr);
idinor	0:dcf3c92487ca	420	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
idinor	0:dcf3c92487ca	421	return;
idinor	0:dcf3c92487ca	422	}
idinor	0:dcf3c92487ca	423
idinor	0:dcf3c92487ca	424	/* Packet is ok so find an existing group */
idinor	0:dcf3c92487ca	425	group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
idinor	0:dcf3c92487ca	426
idinor	0:dcf3c92487ca	427	/* If group can be found or create... */
idinor	0:dcf3c92487ca	428	if (!group) {
idinor	0:dcf3c92487ca	429	pbuf_free(p);
idinor	0:dcf3c92487ca	430	IGMP_STATS_INC(igmp.drop);
idinor	0:dcf3c92487ca	431	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
idinor	0:dcf3c92487ca	432	return;
idinor	0:dcf3c92487ca	433	}
idinor	0:dcf3c92487ca	434
idinor	0:dcf3c92487ca	435	/* NOW ACT ON THE INCOMING MESSAGE TYPE... */
idinor	0:dcf3c92487ca	436	switch (igmp->igmp_msgtype) {
idinor	0:dcf3c92487ca	437	case IGMP_MEMB_QUERY: {
idinor	0:dcf3c92487ca	438	/* IGMP_MEMB_QUERY to the "all systems" address ? */
idinor	0:dcf3c92487ca	439	if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
idinor	0:dcf3c92487ca	440	/* THIS IS THE GENERAL QUERY */
idinor	0:dcf3c92487ca	441	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
idinor	0:dcf3c92487ca	442
idinor	0:dcf3c92487ca	443	if (igmp->igmp_maxresp == 0) {
idinor	0:dcf3c92487ca	444	IGMP_STATS_INC(igmp.rx_v1);
idinor	0:dcf3c92487ca	445	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
idinor	0:dcf3c92487ca	446	igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
idinor	0:dcf3c92487ca	447	} else {
idinor	0:dcf3c92487ca	448	IGMP_STATS_INC(igmp.rx_general);
idinor	0:dcf3c92487ca	449	}
idinor	0:dcf3c92487ca	450
idinor	0:dcf3c92487ca	451	groupref = igmp_group_list;
idinor	0:dcf3c92487ca	452	while (groupref) {
idinor	0:dcf3c92487ca	453	/* Do not send messages on the all systems group address! */
idinor	0:dcf3c92487ca	454	if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
idinor	0:dcf3c92487ca	455	igmp_delaying_member(groupref, igmp->igmp_maxresp);
idinor	0:dcf3c92487ca	456	}
idinor	0:dcf3c92487ca	457	groupref = groupref->next;
idinor	0:dcf3c92487ca	458	}
idinor	0:dcf3c92487ca	459	} else {
idinor	0:dcf3c92487ca	460	/* IGMP_MEMB_QUERY to a specific group ? */
idinor	0:dcf3c92487ca	461	if (!ip_addr_isany(&igmp->igmp_group_address)) {
idinor	0:dcf3c92487ca	462	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
idinor	0:dcf3c92487ca	463	ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
idinor	0:dcf3c92487ca	464	if (ip_addr_cmp(dest, &allsystems)) {
idinor	0:dcf3c92487ca	465	ip_addr_t groupaddr;
idinor	0:dcf3c92487ca	466	LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
idinor	0:dcf3c92487ca	467	/* we first need to re-look for the group since we used dest last time */
idinor	0:dcf3c92487ca	468	ip_addr_copy(groupaddr, igmp->igmp_group_address);
idinor	0:dcf3c92487ca	469	group = igmp_lookfor_group(inp, &groupaddr);
idinor	0:dcf3c92487ca	470	} else {
idinor	0:dcf3c92487ca	471	LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
idinor	0:dcf3c92487ca	472	}
idinor	0:dcf3c92487ca	473
idinor	0:dcf3c92487ca	474	if (group != NULL) {
idinor	0:dcf3c92487ca	475	IGMP_STATS_INC(igmp.rx_group);
idinor	0:dcf3c92487ca	476	igmp_delaying_member(group, igmp->igmp_maxresp);
idinor	0:dcf3c92487ca	477	} else {
idinor	0:dcf3c92487ca	478	IGMP_STATS_INC(igmp.drop);
idinor	0:dcf3c92487ca	479	}
idinor	0:dcf3c92487ca	480	} else {
idinor	0:dcf3c92487ca	481	IGMP_STATS_INC(igmp.proterr);
idinor	0:dcf3c92487ca	482	}
idinor	0:dcf3c92487ca	483	}
idinor	0:dcf3c92487ca	484	break;
idinor	0:dcf3c92487ca	485	}
idinor	0:dcf3c92487ca	486	case IGMP_V2_MEMB_REPORT: {
idinor	0:dcf3c92487ca	487	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
idinor	0:dcf3c92487ca	488	IGMP_STATS_INC(igmp.rx_report);
idinor	0:dcf3c92487ca	489	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
idinor	0:dcf3c92487ca	490	/* This is on a specific group we have already looked up */
idinor	0:dcf3c92487ca	491	group->timer = 0; /* stopped */
idinor	0:dcf3c92487ca	492	group->group_state = IGMP_GROUP_IDLE_MEMBER;
idinor	0:dcf3c92487ca	493	group->last_reporter_flag = 0;
idinor	0:dcf3c92487ca	494	}
idinor	0:dcf3c92487ca	495	break;
idinor	0:dcf3c92487ca	496	}
idinor	0:dcf3c92487ca	497	default: {
idinor	0:dcf3c92487ca	498	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
idinor	0:dcf3c92487ca	499	igmp->igmp_msgtype, group->group_state, &group, group->netif));
idinor	0:dcf3c92487ca	500	IGMP_STATS_INC(igmp.proterr);
idinor	0:dcf3c92487ca	501	break;
idinor	0:dcf3c92487ca	502	}
idinor	0:dcf3c92487ca	503	}
idinor	0:dcf3c92487ca	504
idinor	0:dcf3c92487ca	505	pbuf_free(p);
idinor	0:dcf3c92487ca	506	return;
idinor	0:dcf3c92487ca	507	}
idinor	0:dcf3c92487ca	508
idinor	0:dcf3c92487ca	509	/**
idinor	0:dcf3c92487ca	510	* Join a group on one network interface.
idinor	0:dcf3c92487ca	511	*
idinor	0:dcf3c92487ca	512	* @param ifaddr ip address of the network interface which should join a new group
idinor	0:dcf3c92487ca	513	* @param groupaddr the ip address of the group which to join
idinor	0:dcf3c92487ca	514	* @return ERR_OK if group was joined on the netif(s), an err_t otherwise
idinor	0:dcf3c92487ca	515	*/
idinor	0:dcf3c92487ca	516	err_t
idinor	0:dcf3c92487ca	517	igmp_joingroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
idinor	0:dcf3c92487ca	518	{
idinor	0:dcf3c92487ca	519	err_t err = ERR_VAL; /* no matching interface */
idinor	0:dcf3c92487ca	520	struct igmp_group *group;
idinor	0:dcf3c92487ca	521	struct netif *netif;
idinor	0:dcf3c92487ca	522
idinor	0:dcf3c92487ca	523	/* make sure it is multicast address */
idinor	0:dcf3c92487ca	524	LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
idinor	0:dcf3c92487ca	525	LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
idinor	0:dcf3c92487ca	526
idinor	0:dcf3c92487ca	527	/* loop through netif's */
idinor	0:dcf3c92487ca	528	netif = netif_list;
idinor	0:dcf3c92487ca	529	while (netif != NULL) {
idinor	0:dcf3c92487ca	530	/* Should we join this interface ? */
idinor	0:dcf3c92487ca	531	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
idinor	0:dcf3c92487ca	532	/* find group or create a new one if not found */
idinor	0:dcf3c92487ca	533	group = igmp_lookup_group(netif, groupaddr);
idinor	0:dcf3c92487ca	534
idinor	0:dcf3c92487ca	535	if (group != NULL) {
idinor	0:dcf3c92487ca	536	/* This should create a new group, check the state to make sure */
idinor	0:dcf3c92487ca	537	if (group->group_state != IGMP_GROUP_NON_MEMBER) {
idinor	0:dcf3c92487ca	538	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
idinor	0:dcf3c92487ca	539	} else {
idinor	0:dcf3c92487ca	540	/* OK - it was new group */
idinor	0:dcf3c92487ca	541	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
idinor	0:dcf3c92487ca	542	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
idinor	0:dcf3c92487ca	543	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
idinor	0:dcf3c92487ca	544
idinor	0:dcf3c92487ca	545	/* If first use of the group, allow the group at the MAC level */
idinor	0:dcf3c92487ca	546	if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
idinor	0:dcf3c92487ca	547	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
idinor	0:dcf3c92487ca	548	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
idinor	0:dcf3c92487ca	549	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
idinor	0:dcf3c92487ca	550	netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
idinor	0:dcf3c92487ca	551	}
idinor	0:dcf3c92487ca	552
idinor	0:dcf3c92487ca	553	IGMP_STATS_INC(igmp.tx_join);
idinor	0:dcf3c92487ca	554	igmp_send(group, IGMP_V2_MEMB_REPORT);
idinor	0:dcf3c92487ca	555
idinor	0:dcf3c92487ca	556	igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
idinor	0:dcf3c92487ca	557
idinor	0:dcf3c92487ca	558	/* Need to work out where this timer comes from */
idinor	0:dcf3c92487ca	559	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
idinor	0:dcf3c92487ca	560	}
idinor	0:dcf3c92487ca	561	/* Increment group use */
idinor	0:dcf3c92487ca	562	group->use++;
idinor	0:dcf3c92487ca	563	/* Join on this interface */
idinor	0:dcf3c92487ca	564	err = ERR_OK;
idinor	0:dcf3c92487ca	565	} else {
idinor	0:dcf3c92487ca	566	/* Return an error even if some network interfaces are joined */
idinor	0:dcf3c92487ca	567	/** @todo undo any other netif already joined */
idinor	0:dcf3c92487ca	568	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
idinor	0:dcf3c92487ca	569	return ERR_MEM;
idinor	0:dcf3c92487ca	570	}
idinor	0:dcf3c92487ca	571	}
idinor	0:dcf3c92487ca	572	/* proceed to next network interface */
idinor	0:dcf3c92487ca	573	netif = netif->next;
idinor	0:dcf3c92487ca	574	}
idinor	0:dcf3c92487ca	575
idinor	0:dcf3c92487ca	576	return err;
idinor	0:dcf3c92487ca	577	}
idinor	0:dcf3c92487ca	578
idinor	0:dcf3c92487ca	579	/**
idinor	0:dcf3c92487ca	580	* Leave a group on one network interface.
idinor	0:dcf3c92487ca	581	*
idinor	0:dcf3c92487ca	582	* @param ifaddr ip address of the network interface which should leave a group
idinor	0:dcf3c92487ca	583	* @param groupaddr the ip address of the group which to leave
idinor	0:dcf3c92487ca	584	* @return ERR_OK if group was left on the netif(s), an err_t otherwise
idinor	0:dcf3c92487ca	585	*/
idinor	0:dcf3c92487ca	586	err_t
idinor	0:dcf3c92487ca	587	igmp_leavegroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
idinor	0:dcf3c92487ca	588	{
idinor	0:dcf3c92487ca	589	err_t err = ERR_VAL; /* no matching interface */
idinor	0:dcf3c92487ca	590	struct igmp_group *group;
idinor	0:dcf3c92487ca	591	struct netif *netif;
idinor	0:dcf3c92487ca	592
idinor	0:dcf3c92487ca	593	/* make sure it is multicast address */
idinor	0:dcf3c92487ca	594	LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
idinor	0:dcf3c92487ca	595	LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
idinor	0:dcf3c92487ca	596
idinor	0:dcf3c92487ca	597	/* loop through netif's */
idinor	0:dcf3c92487ca	598	netif = netif_list;
idinor	0:dcf3c92487ca	599	while (netif != NULL) {
idinor	0:dcf3c92487ca	600	/* Should we leave this interface ? */
idinor	0:dcf3c92487ca	601	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
idinor	0:dcf3c92487ca	602	/* find group */
idinor	0:dcf3c92487ca	603	group = igmp_lookfor_group(netif, groupaddr);
idinor	0:dcf3c92487ca	604
idinor	0:dcf3c92487ca	605	if (group != NULL) {
idinor	0:dcf3c92487ca	606	/* Only send a leave if the flag is set according to the state diagram */
idinor	0:dcf3c92487ca	607	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
idinor	0:dcf3c92487ca	608	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
idinor	0:dcf3c92487ca	609	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
idinor	0:dcf3c92487ca	610
idinor	0:dcf3c92487ca	611	/* If there is no other use of the group */
idinor	0:dcf3c92487ca	612	if (group->use <= 1) {
idinor	0:dcf3c92487ca	613	/* If we are the last reporter for this group */
idinor	0:dcf3c92487ca	614	if (group->last_reporter_flag) {
idinor	0:dcf3c92487ca	615	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
idinor	0:dcf3c92487ca	616	IGMP_STATS_INC(igmp.tx_leave);
idinor	0:dcf3c92487ca	617	igmp_send(group, IGMP_LEAVE_GROUP);
idinor	0:dcf3c92487ca	618	}
idinor	0:dcf3c92487ca	619
idinor	0:dcf3c92487ca	620	/* Disable the group at the MAC level */
idinor	0:dcf3c92487ca	621	if (netif->igmp_mac_filter != NULL) {
idinor	0:dcf3c92487ca	622	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
idinor	0:dcf3c92487ca	623	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
idinor	0:dcf3c92487ca	624	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
idinor	0:dcf3c92487ca	625	netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
idinor	0:dcf3c92487ca	626	}
idinor	0:dcf3c92487ca	627
idinor	0:dcf3c92487ca	628	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
idinor	0:dcf3c92487ca	629	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
idinor	0:dcf3c92487ca	630	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
idinor	0:dcf3c92487ca	631
idinor	0:dcf3c92487ca	632	/* Free the group */
idinor	0:dcf3c92487ca	633	igmp_remove_group(group);
idinor	0:dcf3c92487ca	634	} else {
idinor	0:dcf3c92487ca	635	/* Decrement group use */
idinor	0:dcf3c92487ca	636	group->use--;
idinor	0:dcf3c92487ca	637	}
idinor	0:dcf3c92487ca	638	/* Leave on this interface */
idinor	0:dcf3c92487ca	639	err = ERR_OK;
idinor	0:dcf3c92487ca	640	} else {
idinor	0:dcf3c92487ca	641	/* It's not a fatal error on "leavegroup" */
idinor	0:dcf3c92487ca	642	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
idinor	0:dcf3c92487ca	643	}
idinor	0:dcf3c92487ca	644	}
idinor	0:dcf3c92487ca	645	/* proceed to next network interface */
idinor	0:dcf3c92487ca	646	netif = netif->next;
idinor	0:dcf3c92487ca	647	}
idinor	0:dcf3c92487ca	648
idinor	0:dcf3c92487ca	649	return err;
idinor	0:dcf3c92487ca	650	}
idinor	0:dcf3c92487ca	651
idinor	0:dcf3c92487ca	652	/**
idinor	0:dcf3c92487ca	653	* The igmp timer function (both for NO_SYS=1 and =0)
idinor	0:dcf3c92487ca	654	* Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
idinor	0:dcf3c92487ca	655	*/
idinor	0:dcf3c92487ca	656	void
idinor	0:dcf3c92487ca	657	igmp_tmr(void)
idinor	0:dcf3c92487ca	658	{
idinor	0:dcf3c92487ca	659	struct igmp_group *group = igmp_group_list;
idinor	0:dcf3c92487ca	660
idinor	0:dcf3c92487ca	661	while (group != NULL) {
idinor	0:dcf3c92487ca	662	if (group->timer > 0) {
idinor	0:dcf3c92487ca	663	group->timer--;
idinor	0:dcf3c92487ca	664	if (group->timer == 0) {
idinor	0:dcf3c92487ca	665	igmp_timeout(group);
idinor	0:dcf3c92487ca	666	}
idinor	0:dcf3c92487ca	667	}
idinor	0:dcf3c92487ca	668	group = group->next;
idinor	0:dcf3c92487ca	669	}
idinor	0:dcf3c92487ca	670	}
idinor	0:dcf3c92487ca	671
idinor	0:dcf3c92487ca	672	/**
idinor	0:dcf3c92487ca	673	* Called if a timeout for one group is reached.
idinor	0:dcf3c92487ca	674	* Sends a report for this group.
idinor	0:dcf3c92487ca	675	*
idinor	0:dcf3c92487ca	676	* @param group an igmp_group for which a timeout is reached
idinor	0:dcf3c92487ca	677	*/
idinor	0:dcf3c92487ca	678	static void
idinor	0:dcf3c92487ca	679	igmp_timeout(struct igmp_group *group)
idinor	0:dcf3c92487ca	680	{
idinor	0:dcf3c92487ca	681	/* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
idinor	0:dcf3c92487ca	682	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
idinor	0:dcf3c92487ca	683	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
idinor	0:dcf3c92487ca	684	ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
idinor	0:dcf3c92487ca	685	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
idinor	0:dcf3c92487ca	686
idinor	0:dcf3c92487ca	687	IGMP_STATS_INC(igmp.tx_report);
idinor	0:dcf3c92487ca	688	igmp_send(group, IGMP_V2_MEMB_REPORT);
idinor	0:dcf3c92487ca	689	}
idinor	0:dcf3c92487ca	690	}
idinor	0:dcf3c92487ca	691
idinor	0:dcf3c92487ca	692	/**
idinor	0:dcf3c92487ca	693	* Start a timer for an igmp group
idinor	0:dcf3c92487ca	694	*
idinor	0:dcf3c92487ca	695	* @param group the igmp_group for which to start a timer
idinor	0:dcf3c92487ca	696	* @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
idinor	0:dcf3c92487ca	697	* every call to igmp_tmr())
idinor	0:dcf3c92487ca	698	*/
idinor	0:dcf3c92487ca	699	static void
idinor	0:dcf3c92487ca	700	igmp_start_timer(struct igmp_group *group, u8_t max_time)
idinor	0:dcf3c92487ca	701	{
idinor	0:dcf3c92487ca	702	/* ensure the input value is > 0 */
idinor	0:dcf3c92487ca	703	if (max_time == 0) {
idinor	0:dcf3c92487ca	704	max_time = 1;
idinor	0:dcf3c92487ca	705	}
idinor	0:dcf3c92487ca	706	/* ensure the random value is > 0 */
idinor	0:dcf3c92487ca	707	group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
idinor	0:dcf3c92487ca	708	}
idinor	0:dcf3c92487ca	709
idinor	0:dcf3c92487ca	710	/**
idinor	0:dcf3c92487ca	711	* Stop a timer for an igmp_group
idinor	0:dcf3c92487ca	712	*
idinor	0:dcf3c92487ca	713	* @param group the igmp_group for which to stop the timer
idinor	0:dcf3c92487ca	714	*/
idinor	0:dcf3c92487ca	715	static void
idinor	0:dcf3c92487ca	716	igmp_stop_timer(struct igmp_group *group)
idinor	0:dcf3c92487ca	717	{
idinor	0:dcf3c92487ca	718	group->timer = 0;
idinor	0:dcf3c92487ca	719	}
idinor	0:dcf3c92487ca	720
idinor	0:dcf3c92487ca	721	/**
idinor	0:dcf3c92487ca	722	* Delaying membership report for a group if necessary
idinor	0:dcf3c92487ca	723	*
idinor	0:dcf3c92487ca	724	* @param group the igmp_group for which "delaying" membership report
idinor	0:dcf3c92487ca	725	* @param maxresp query delay
idinor	0:dcf3c92487ca	726	*/
idinor	0:dcf3c92487ca	727	static void
idinor	0:dcf3c92487ca	728	igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
idinor	0:dcf3c92487ca	729	{
idinor	0:dcf3c92487ca	730	if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) \|\|
idinor	0:dcf3c92487ca	731	((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
idinor	0:dcf3c92487ca	732	((group->timer == 0) \|\| (maxresp < group->timer)))) {
idinor	0:dcf3c92487ca	733	igmp_start_timer(group, maxresp);
idinor	0:dcf3c92487ca	734	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
idinor	0:dcf3c92487ca	735	}
idinor	0:dcf3c92487ca	736	}
idinor	0:dcf3c92487ca	737
idinor	0:dcf3c92487ca	738
idinor	0:dcf3c92487ca	739	/**
idinor	0:dcf3c92487ca	740	* Sends an IP packet on a network interface. This function constructs the IP header
idinor	0:dcf3c92487ca	741	* and calculates the IP header checksum. If the source IP address is NULL,
idinor	0:dcf3c92487ca	742	* the IP address of the outgoing network interface is filled in as source address.
idinor	0:dcf3c92487ca	743	*
idinor	0:dcf3c92487ca	744	* @param p the packet to send (p->payload points to the data, e.g. next
idinor	0:dcf3c92487ca	745	protocol header; if dest == IP_HDRINCL, p already includes an IP
idinor	0:dcf3c92487ca	746	header and p->payload points to that IP header)
idinor	0:dcf3c92487ca	747	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
idinor	0:dcf3c92487ca	748	* IP address of the netif used to send is used as source address)
idinor	0:dcf3c92487ca	749	* @param dest the destination IP address to send the packet to
idinor	0:dcf3c92487ca	750	* @param ttl the TTL value to be set in the IP header
idinor	0:dcf3c92487ca	751	* @param proto the PROTOCOL to be set in the IP header
idinor	0:dcf3c92487ca	752	* @param netif the netif on which to send this packet
idinor	0:dcf3c92487ca	753	* @return ERR_OK if the packet was sent OK
idinor	0:dcf3c92487ca	754	* ERR_BUF if p doesn't have enough space for IP/LINK headers
idinor	0:dcf3c92487ca	755	* returns errors returned by netif->output
idinor	0:dcf3c92487ca	756	*/
idinor	0:dcf3c92487ca	757	static err_t
idinor	0:dcf3c92487ca	758	igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif)
idinor	0:dcf3c92487ca	759	{
idinor	0:dcf3c92487ca	760	/* This is the "router alert" option */
idinor	0:dcf3c92487ca	761	u16_t ra[2];
idinor	0:dcf3c92487ca	762	ra[0] = PP_HTONS(ROUTER_ALERT);
idinor	0:dcf3c92487ca	763	ra[1] = 0x0000; /* Router shall examine packet */
idinor	0:dcf3c92487ca	764	IGMP_STATS_INC(igmp.xmit);
idinor	0:dcf3c92487ca	765	return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
idinor	0:dcf3c92487ca	766	}
idinor	0:dcf3c92487ca	767
idinor	0:dcf3c92487ca	768	/**
idinor	0:dcf3c92487ca	769	* Send an igmp packet to a specific group.
idinor	0:dcf3c92487ca	770	*
idinor	0:dcf3c92487ca	771	* @param group the group to which to send the packet
idinor	0:dcf3c92487ca	772	* @param type the type of igmp packet to send
idinor	0:dcf3c92487ca	773	*/
idinor	0:dcf3c92487ca	774	static void
idinor	0:dcf3c92487ca	775	igmp_send(struct igmp_group *group, u8_t type)
idinor	0:dcf3c92487ca	776	{
idinor	0:dcf3c92487ca	777	struct pbuf* p = NULL;
idinor	0:dcf3c92487ca	778	struct igmp_msg* igmp = NULL;
idinor	0:dcf3c92487ca	779	ip_addr_t src = *IP_ADDR_ANY;
idinor	0:dcf3c92487ca	780	ip_addr_t* dest = NULL;
idinor	0:dcf3c92487ca	781
idinor	0:dcf3c92487ca	782	/* IP header + "router alert" option + IGMP header */
idinor	0:dcf3c92487ca	783	p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
idinor	0:dcf3c92487ca	784
idinor	0:dcf3c92487ca	785	if (p) {
idinor	0:dcf3c92487ca	786	igmp = (struct igmp_msg *)p->payload;
idinor	0:dcf3c92487ca	787	LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
idinor	0:dcf3c92487ca	788	(p->len >= sizeof(struct igmp_msg)));
idinor	0:dcf3c92487ca	789	ip_addr_copy(src, group->netif->ip_addr);
idinor	0:dcf3c92487ca	790
idinor	0:dcf3c92487ca	791	if (type == IGMP_V2_MEMB_REPORT) {
idinor	0:dcf3c92487ca	792	dest = &(group->group_address);
idinor	0:dcf3c92487ca	793	ip_addr_copy(igmp->igmp_group_address, group->group_address);
idinor	0:dcf3c92487ca	794	group->last_reporter_flag = 1; /* Remember we were the last to report */
idinor	0:dcf3c92487ca	795	} else {
idinor	0:dcf3c92487ca	796	if (type == IGMP_LEAVE_GROUP) {
idinor	0:dcf3c92487ca	797	dest = &allrouters;
idinor	0:dcf3c92487ca	798	ip_addr_copy(igmp->igmp_group_address, group->group_address);
idinor	0:dcf3c92487ca	799	}
idinor	0:dcf3c92487ca	800	}
idinor	0:dcf3c92487ca	801
idinor	0:dcf3c92487ca	802	if ((type == IGMP_V2_MEMB_REPORT) \|\| (type == IGMP_LEAVE_GROUP)) {
idinor	0:dcf3c92487ca	803	igmp->igmp_msgtype = type;
idinor	0:dcf3c92487ca	804	igmp->igmp_maxresp = 0;
idinor	0:dcf3c92487ca	805	igmp->igmp_checksum = 0;
idinor	0:dcf3c92487ca	806	igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
idinor	0:dcf3c92487ca	807
idinor	0:dcf3c92487ca	808	igmp_ip_output_if(p, &src, dest, group->netif);
idinor	0:dcf3c92487ca	809	}
idinor	0:dcf3c92487ca	810
idinor	0:dcf3c92487ca	811	pbuf_free(p);
idinor	0:dcf3c92487ca	812	} else {
idinor	0:dcf3c92487ca	813	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
idinor	0:dcf3c92487ca	814	IGMP_STATS_INC(igmp.memerr);
idinor	0:dcf3c92487ca	815	}
idinor	0:dcf3c92487ca	816	}
idinor	0:dcf3c92487ca	817
idinor	0:dcf3c92487ca	818	#endif /* LWIP_IGMP */

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Type:	Library
Created:	20 Jul 2011
Imports:	35
Forks:	0
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	1

lwip/core/ipv4/igmp.c@0:dcf3c92487ca, 2011-07-20 (annotated)

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