Bonjour - Bonjour/Zerconf library

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Dirk-Willem van Gulik (NXP/mbed) / Mbed 2 deprecated Bonjour

Bonjour/Zerconf library

lwip/core/ipv4/igmp.c@2:816cbd922d3e, 2010-07-24 (annotated)

Committer:: dirkx
Date:: Sat Jul 24 20:59:52 2010 +0000
Revision:: 2:816cbd922d3e
Parent:: 0:355018f44c9f

Who changed what in which revision?

User	Revision	Line number	New contents of line
dirkx	0:355018f44c9f	1	/**
dirkx	0:355018f44c9f	2	* @file
dirkx	0:355018f44c9f	3	* IGMP - Internet Group Management Protocol
dirkx	0:355018f44c9f	4	*
dirkx	0:355018f44c9f	5	*/
dirkx	0:355018f44c9f	6
dirkx	0:355018f44c9f	7	/*
dirkx	0:355018f44c9f	8	* Copyright (c) 2002 CITEL Technologies Ltd.
dirkx	0:355018f44c9f	9	* All rights reserved.
dirkx	0:355018f44c9f	10	*
dirkx	0:355018f44c9f	11	* Redistribution and use in source and binary forms, with or without
dirkx	0:355018f44c9f	12	* modification, are permitted provided that the following conditions
dirkx	0:355018f44c9f	13	* are met:
dirkx	0:355018f44c9f	14	* 1. Redistributions of source code must retain the above copyright
dirkx	0:355018f44c9f	15	* notice, this list of conditions and the following disclaimer.
dirkx	0:355018f44c9f	16	* 2. Redistributions in binary form must reproduce the above copyright
dirkx	0:355018f44c9f	17	* notice, this list of conditions and the following disclaimer in the
dirkx	0:355018f44c9f	18	* documentation and/or other materials provided with the distribution.
dirkx	0:355018f44c9f	19	* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
dirkx	0:355018f44c9f	20	* may be used to endorse or promote products derived from this software
dirkx	0:355018f44c9f	21	* without specific prior written permission.
dirkx	0:355018f44c9f	22	*
dirkx	0:355018f44c9f	23	* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
dirkx	0:355018f44c9f	24	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
dirkx	0:355018f44c9f	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
dirkx	0:355018f44c9f	26	* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
dirkx	0:355018f44c9f	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
dirkx	0:355018f44c9f	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
dirkx	0:355018f44c9f	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
dirkx	0:355018f44c9f	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
dirkx	0:355018f44c9f	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
dirkx	0:355018f44c9f	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
dirkx	0:355018f44c9f	33	* SUCH DAMAGE.
dirkx	0:355018f44c9f	34	*
dirkx	0:355018f44c9f	35	* This file is a contribution to the lwIP TCP/IP stack.
dirkx	0:355018f44c9f	36	* The Swedish Institute of Computer Science and Adam Dunkels
dirkx	0:355018f44c9f	37	* are specifically granted permission to redistribute this
dirkx	0:355018f44c9f	38	* source code.
dirkx	0:355018f44c9f	39	*/
dirkx	0:355018f44c9f	40
dirkx	0:355018f44c9f	41	/*-------------------------------------------------------------
dirkx	0:355018f44c9f	42	Note 1)
dirkx	0:355018f44c9f	43	Although the rfc requires V1 AND V2 capability
dirkx	0:355018f44c9f	44	we will only support v2 since now V1 is very old (August 1989)
dirkx	0:355018f44c9f	45	V1 can be added if required
dirkx	0:355018f44c9f	46
dirkx	0:355018f44c9f	47	a debug print and statistic have been implemented to
dirkx	0:355018f44c9f	48	show this up.
dirkx	0:355018f44c9f	49	-------------------------------------------------------------
dirkx	0:355018f44c9f	50	-------------------------------------------------------------
dirkx	0:355018f44c9f	51	Note 2)
dirkx	0:355018f44c9f	52	A query for a specific group address (as opposed to ALLHOSTS)
dirkx	0:355018f44c9f	53	has now been implemented as I am unsure if it is required
dirkx	0:355018f44c9f	54
dirkx	0:355018f44c9f	55	a debug print and statistic have been implemented to
dirkx	0:355018f44c9f	56	show this up.
dirkx	0:355018f44c9f	57	-------------------------------------------------------------
dirkx	0:355018f44c9f	58	-------------------------------------------------------------
dirkx	0:355018f44c9f	59	Note 3)
dirkx	0:355018f44c9f	60	The router alert rfc 2113 is implemented in outgoing packets
dirkx	0:355018f44c9f	61	but not checked rigorously incoming
dirkx	0:355018f44c9f	62	-------------------------------------------------------------
dirkx	0:355018f44c9f	63	Steve Reynolds
dirkx	0:355018f44c9f	64	------------------------------------------------------------*/
dirkx	0:355018f44c9f	65
dirkx	0:355018f44c9f	66	/*-----------------------------------------------------------------------------
dirkx	0:355018f44c9f	67	* RFC 988 - Host extensions for IP multicasting - V0
dirkx	0:355018f44c9f	68	* RFC 1054 - Host extensions for IP multicasting -
dirkx	0:355018f44c9f	69	* RFC 1112 - Host extensions for IP multicasting - V1
dirkx	0:355018f44c9f	70	* RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
dirkx	0:355018f44c9f	71	* RFC 3376 - Internet Group Management Protocol, Version 3 - V3
dirkx	0:355018f44c9f	72	* RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
dirkx	0:355018f44c9f	73	* RFC 2113 - IP Router Alert Option -
dirkx	0:355018f44c9f	74	----------------------------------------------------------------------------/
dirkx	0:355018f44c9f	75
dirkx	0:355018f44c9f	76	/*-----------------------------------------------------------------------------
dirkx	0:355018f44c9f	77	* Includes
dirkx	0:355018f44c9f	78	----------------------------------------------------------------------------/
dirkx	0:355018f44c9f	79
dirkx	0:355018f44c9f	80	#include "lwip/opt.h"
dirkx	0:355018f44c9f	81
dirkx	0:355018f44c9f	82	#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
dirkx	0:355018f44c9f	83
dirkx	0:355018f44c9f	84	#include "lwip/igmp.h"
dirkx	0:355018f44c9f	85	#include "lwip/debug.h"
dirkx	0:355018f44c9f	86	#include "lwip/def.h"
dirkx	0:355018f44c9f	87	#include "lwip/mem.h"
dirkx	0:355018f44c9f	88	#include "lwip/ip.h"
dirkx	0:355018f44c9f	89	#include "lwip/inet_chksum.h"
dirkx	0:355018f44c9f	90	#include "lwip/netif.h"
dirkx	0:355018f44c9f	91	#include "lwip/icmp.h"
dirkx	0:355018f44c9f	92	#include "lwip/udp.h"
dirkx	0:355018f44c9f	93	#include "lwip/tcp.h"
dirkx	0:355018f44c9f	94	#include "lwip/stats.h"
dirkx	0:355018f44c9f	95
dirkx	0:355018f44c9f	96	#include "string.h"
dirkx	0:355018f44c9f	97
dirkx	0:355018f44c9f	98	/*
dirkx	0:355018f44c9f	99	* IGMP constants
dirkx	0:355018f44c9f	100	*/
dirkx	0:355018f44c9f	101	#define IGMP_TTL 1
dirkx	0:355018f44c9f	102	#define IGMP_MINLEN 8
dirkx	0:355018f44c9f	103	#define ROUTER_ALERT 0x9404
dirkx	0:355018f44c9f	104	#define ROUTER_ALERTLEN 4
dirkx	0:355018f44c9f	105
dirkx	0:355018f44c9f	106	/*
dirkx	0:355018f44c9f	107	* IGMP message types, including version number.
dirkx	0:355018f44c9f	108	*/
dirkx	0:355018f44c9f	109	#define IGMP_MEMB_QUERY 0x11 /* Membership query */
dirkx	0:355018f44c9f	110	#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
dirkx	0:355018f44c9f	111	#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
dirkx	0:355018f44c9f	112	#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
dirkx	0:355018f44c9f	113
dirkx	0:355018f44c9f	114	/* Group membership states */
dirkx	0:355018f44c9f	115	#define IGMP_GROUP_NON_MEMBER 0
dirkx	0:355018f44c9f	116	#define IGMP_GROUP_DELAYING_MEMBER 1
dirkx	0:355018f44c9f	117	#define IGMP_GROUP_IDLE_MEMBER 2
dirkx	0:355018f44c9f	118
dirkx	0:355018f44c9f	119	/**
dirkx	0:355018f44c9f	120	* IGMP packet format.
dirkx	0:355018f44c9f	121	*/
dirkx	0:355018f44c9f	122	#ifdef PACK_STRUCT_USE_INCLUDES
dirkx	0:355018f44c9f	123	# include "arch/bpstruct.h"
dirkx	0:355018f44c9f	124	#endif
dirkx	0:355018f44c9f	125	PACK_STRUCT_BEGIN
dirkx	0:355018f44c9f	126	struct igmp_msg {
dirkx	0:355018f44c9f	127	PACK_STRUCT_FIELD(u8_t igmp_msgtype);
dirkx	0:355018f44c9f	128	PACK_STRUCT_FIELD(u8_t igmp_maxresp);
dirkx	0:355018f44c9f	129	PACK_STRUCT_FIELD(u16_t igmp_checksum);
dirkx	0:355018f44c9f	130	PACK_STRUCT_FIELD(ip_addr_t igmp_group_address);
dirkx	0:355018f44c9f	131	} PACK_STRUCT_STRUCT;
dirkx	0:355018f44c9f	132	PACK_STRUCT_END
dirkx	0:355018f44c9f	133	#ifdef PACK_STRUCT_USE_INCLUDES
dirkx	0:355018f44c9f	134	# include "arch/epstruct.h"
dirkx	0:355018f44c9f	135	#endif
dirkx	0:355018f44c9f	136
dirkx	0:355018f44c9f	137
dirkx	0:355018f44c9f	138	static struct igmp_group igmp_lookup_group(struct netif ifp, ip_addr_t *addr);
dirkx	0:355018f44c9f	139	static err_t igmp_remove_group(struct igmp_group *group);
dirkx	0:355018f44c9f	140	static void igmp_timeout( struct igmp_group *group);
dirkx	0:355018f44c9f	141	static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
dirkx	0:355018f44c9f	142	static void igmp_stop_timer(struct igmp_group *group);
dirkx	0:355018f44c9f	143	static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
dirkx	0:355018f44c9f	144	static err_t igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif);
dirkx	0:355018f44c9f	145	static void igmp_send(struct igmp_group *group, u8_t type);
dirkx	0:355018f44c9f	146
dirkx	0:355018f44c9f	147
dirkx	0:355018f44c9f	148	static struct igmp_group* igmp_group_list;
dirkx	0:355018f44c9f	149	static ip_addr_t allsystems;
dirkx	0:355018f44c9f	150	static ip_addr_t allrouters;
dirkx	0:355018f44c9f	151
dirkx	0:355018f44c9f	152
dirkx	0:355018f44c9f	153	/**
dirkx	0:355018f44c9f	154	* Initialize the IGMP module
dirkx	0:355018f44c9f	155	*/
dirkx	0:355018f44c9f	156	void
dirkx	0:355018f44c9f	157	igmp_init(void)
dirkx	0:355018f44c9f	158	{
dirkx	0:355018f44c9f	159	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
dirkx	0:355018f44c9f	160
dirkx	0:355018f44c9f	161	IP4_ADDR(&allsystems, 224, 0, 0, 1);
dirkx	0:355018f44c9f	162	IP4_ADDR(&allrouters, 224, 0, 0, 2);
dirkx	0:355018f44c9f	163	}
dirkx	0:355018f44c9f	164
dirkx	0:355018f44c9f	165	#ifdef LWIP_DEBUG
dirkx	0:355018f44c9f	166	/**
dirkx	0:355018f44c9f	167	* Dump global IGMP groups list
dirkx	0:355018f44c9f	168	*/
dirkx	0:355018f44c9f	169	void
dirkx	0:355018f44c9f	170	igmp_dump_group_list()
dirkx	0:355018f44c9f	171	{
dirkx	0:355018f44c9f	172	struct igmp_group *group = igmp_group_list;
dirkx	0:355018f44c9f	173
dirkx	0:355018f44c9f	174	while (group != NULL) {
dirkx	0:355018f44c9f	175	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
dirkx	0:355018f44c9f	176	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
dirkx	0:355018f44c9f	177	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
dirkx	0:355018f44c9f	178	group = group->next;
dirkx	0:355018f44c9f	179	}
dirkx	0:355018f44c9f	180	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
dirkx	0:355018f44c9f	181	}
dirkx	0:355018f44c9f	182	#else
dirkx	0:355018f44c9f	183	#define igmp_dump_group_list()
dirkx	0:355018f44c9f	184	#endif /* LWIP_DEBUG */
dirkx	0:355018f44c9f	185
dirkx	0:355018f44c9f	186	/**
dirkx	0:355018f44c9f	187	* Start IGMP processing on interface
dirkx	0:355018f44c9f	188	*
dirkx	0:355018f44c9f	189	* @param netif network interface on which start IGMP processing
dirkx	0:355018f44c9f	190	*/
dirkx	0:355018f44c9f	191	err_t
dirkx	0:355018f44c9f	192	igmp_start(struct netif *netif)
dirkx	0:355018f44c9f	193	{
dirkx	0:355018f44c9f	194	struct igmp_group* group;
dirkx	0:355018f44c9f	195
dirkx	0:355018f44c9f	196	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
dirkx	0:355018f44c9f	197
dirkx	0:355018f44c9f	198	group = igmp_lookup_group(netif, &allsystems);
dirkx	0:355018f44c9f	199
dirkx	0:355018f44c9f	200	if (group != NULL) {
dirkx	0:355018f44c9f	201	group->group_state = IGMP_GROUP_IDLE_MEMBER;
dirkx	0:355018f44c9f	202	group->use++;
dirkx	0:355018f44c9f	203
dirkx	0:355018f44c9f	204	/* Allow the igmp messages at the MAC level */
dirkx	0:355018f44c9f	205	if (netif->igmp_mac_filter != NULL) {
dirkx	0:355018f44c9f	206	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
dirkx	0:355018f44c9f	207	ip_addr_debug_print(IGMP_DEBUG, &allsystems);
dirkx	0:355018f44c9f	208	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
dirkx	0:355018f44c9f	209	netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
dirkx	0:355018f44c9f	210	}
dirkx	0:355018f44c9f	211
dirkx	0:355018f44c9f	212	return ERR_OK;
dirkx	0:355018f44c9f	213	}
dirkx	0:355018f44c9f	214
dirkx	0:355018f44c9f	215	return ERR_MEM;
dirkx	0:355018f44c9f	216	}
dirkx	0:355018f44c9f	217
dirkx	0:355018f44c9f	218	/**
dirkx	0:355018f44c9f	219	* Stop IGMP processing on interface
dirkx	0:355018f44c9f	220	*
dirkx	0:355018f44c9f	221	* @param netif network interface on which stop IGMP processing
dirkx	0:355018f44c9f	222	*/
dirkx	0:355018f44c9f	223	err_t
dirkx	0:355018f44c9f	224	igmp_stop(struct netif *netif)
dirkx	0:355018f44c9f	225	{
dirkx	0:355018f44c9f	226	struct igmp_group *group = igmp_group_list;
dirkx	0:355018f44c9f	227	struct igmp_group *prev = NULL;
dirkx	0:355018f44c9f	228	struct igmp_group *next;
dirkx	0:355018f44c9f	229
dirkx	0:355018f44c9f	230	/* look for groups joined on this interface further down the list */
dirkx	0:355018f44c9f	231	while (group != NULL) {
dirkx	0:355018f44c9f	232	next = group->next;
dirkx	0:355018f44c9f	233	/* is it a group joined on this interface? */
dirkx	0:355018f44c9f	234	if (group->netif == netif) {
dirkx	0:355018f44c9f	235	/* is it the first group of the list? */
dirkx	0:355018f44c9f	236	if (group == igmp_group_list) {
dirkx	0:355018f44c9f	237	igmp_group_list = next;
dirkx	0:355018f44c9f	238	}
dirkx	0:355018f44c9f	239	/* is there a "previous" group defined? */
dirkx	0:355018f44c9f	240	if (prev != NULL) {
dirkx	0:355018f44c9f	241	prev->next = next;
dirkx	0:355018f44c9f	242	}
dirkx	0:355018f44c9f	243	/* disable the group at the MAC level */
dirkx	0:355018f44c9f	244	if (netif->igmp_mac_filter != NULL) {
dirkx	0:355018f44c9f	245	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
dirkx	0:355018f44c9f	246	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
dirkx	0:355018f44c9f	247	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
dirkx	0:355018f44c9f	248	netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
dirkx	0:355018f44c9f	249	}
dirkx	0:355018f44c9f	250	/* free group */
dirkx	0:355018f44c9f	251	memp_free(MEMP_IGMP_GROUP, group);
dirkx	0:355018f44c9f	252	} else {
dirkx	0:355018f44c9f	253	/* change the "previous" */
dirkx	0:355018f44c9f	254	prev = group;
dirkx	0:355018f44c9f	255	}
dirkx	0:355018f44c9f	256	/* move to "next" */
dirkx	0:355018f44c9f	257	group = next;
dirkx	0:355018f44c9f	258	}
dirkx	0:355018f44c9f	259	return ERR_OK;
dirkx	0:355018f44c9f	260	}
dirkx	0:355018f44c9f	261
dirkx	0:355018f44c9f	262	/**
dirkx	0:355018f44c9f	263	* Report IGMP memberships for this interface
dirkx	0:355018f44c9f	264	*
dirkx	0:355018f44c9f	265	* @param netif network interface on which report IGMP memberships
dirkx	0:355018f44c9f	266	*/
dirkx	0:355018f44c9f	267	void
dirkx	0:355018f44c9f	268	igmp_report_groups(struct netif *netif)
dirkx	0:355018f44c9f	269	{
dirkx	0:355018f44c9f	270	struct igmp_group *group = igmp_group_list;
dirkx	0:355018f44c9f	271
dirkx	0:355018f44c9f	272	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
dirkx	0:355018f44c9f	273
dirkx	0:355018f44c9f	274	while (group != NULL) {
dirkx	0:355018f44c9f	275	if (group->netif == netif) {
dirkx	0:355018f44c9f	276	igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
dirkx	0:355018f44c9f	277	}
dirkx	0:355018f44c9f	278	group = group->next;
dirkx	0:355018f44c9f	279	}
dirkx	0:355018f44c9f	280	}
dirkx	0:355018f44c9f	281
dirkx	0:355018f44c9f	282	/**
dirkx	0:355018f44c9f	283	* Search for a group in the global igmp_group_list
dirkx	0:355018f44c9f	284	*
dirkx	0:355018f44c9f	285	* @param ifp the network interface for which to look
dirkx	0:355018f44c9f	286	* @param addr the group ip address to search for
dirkx	0:355018f44c9f	287	* @return a struct igmp_group* if the group has been found,
dirkx	0:355018f44c9f	288	* NULL if the group wasn't found.
dirkx	0:355018f44c9f	289	*/
dirkx	0:355018f44c9f	290	struct igmp_group *
dirkx	0:355018f44c9f	291	igmp_lookfor_group(struct netif ifp, ip_addr_t addr)
dirkx	0:355018f44c9f	292	{
dirkx	0:355018f44c9f	293	struct igmp_group *group = igmp_group_list;
dirkx	0:355018f44c9f	294
dirkx	0:355018f44c9f	295	while (group != NULL) {
dirkx	0:355018f44c9f	296	if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
dirkx	0:355018f44c9f	297	return group;
dirkx	0:355018f44c9f	298	}
dirkx	0:355018f44c9f	299	group = group->next;
dirkx	0:355018f44c9f	300	}
dirkx	0:355018f44c9f	301
dirkx	0:355018f44c9f	302	/* to be clearer, we return NULL here instead of
dirkx	0:355018f44c9f	303	* 'group' (which is also NULL at this point).
dirkx	0:355018f44c9f	304	*/
dirkx	0:355018f44c9f	305	return NULL;
dirkx	0:355018f44c9f	306	}
dirkx	0:355018f44c9f	307
dirkx	0:355018f44c9f	308	/**
dirkx	0:355018f44c9f	309	* Search for a specific igmp group and create a new one if not found-
dirkx	0:355018f44c9f	310	*
dirkx	0:355018f44c9f	311	* @param ifp the network interface for which to look
dirkx	0:355018f44c9f	312	* @param addr the group ip address to search
dirkx	0:355018f44c9f	313	* @return a struct igmp_group*,
dirkx	0:355018f44c9f	314	* NULL on memory error.
dirkx	0:355018f44c9f	315	*/
dirkx	0:355018f44c9f	316	struct igmp_group *
dirkx	0:355018f44c9f	317	igmp_lookup_group(struct netif ifp, ip_addr_t addr)
dirkx	0:355018f44c9f	318	{
dirkx	0:355018f44c9f	319	struct igmp_group *group = igmp_group_list;
dirkx	0:355018f44c9f	320
dirkx	0:355018f44c9f	321	/* Search if the group already exists */
dirkx	0:355018f44c9f	322	group = igmp_lookfor_group(ifp, addr);
dirkx	0:355018f44c9f	323	if (group != NULL) {
dirkx	0:355018f44c9f	324	/* Group already exists. */
dirkx	0:355018f44c9f	325	return group;
dirkx	0:355018f44c9f	326	}
dirkx	0:355018f44c9f	327
dirkx	0:355018f44c9f	328	/* Group doesn't exist yet, create a new one */
dirkx	2:816cbd922d3e	329	group = (struct igmp_group *) memp_malloc(MEMP_IGMP_GROUP);
dirkx	0:355018f44c9f	330	if (group != NULL) {
dirkx	0:355018f44c9f	331	group->netif = ifp;
dirkx	0:355018f44c9f	332	ip_addr_set(&(group->group_address), addr);
dirkx	0:355018f44c9f	333	group->timer = 0; /* Not running */
dirkx	0:355018f44c9f	334	group->group_state = IGMP_GROUP_NON_MEMBER;
dirkx	0:355018f44c9f	335	group->last_reporter_flag = 0;
dirkx	0:355018f44c9f	336	group->use = 0;
dirkx	0:355018f44c9f	337	group->next = igmp_group_list;
dirkx	0:355018f44c9f	338
dirkx	0:355018f44c9f	339	igmp_group_list = group;
dirkx	0:355018f44c9f	340	}
dirkx	0:355018f44c9f	341
dirkx	0:355018f44c9f	342	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
dirkx	0:355018f44c9f	343	ip_addr_debug_print(IGMP_DEBUG, addr);
dirkx	0:355018f44c9f	344	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
dirkx	0:355018f44c9f	345
dirkx	0:355018f44c9f	346	return group;
dirkx	0:355018f44c9f	347	}
dirkx	0:355018f44c9f	348
dirkx	0:355018f44c9f	349	/**
dirkx	0:355018f44c9f	350	* Remove a group in the global igmp_group_list
dirkx	0:355018f44c9f	351	*
dirkx	0:355018f44c9f	352	* @param group the group to remove from the global igmp_group_list
dirkx	0:355018f44c9f	353	* @return ERR_OK if group was removed from the list, an err_t otherwise
dirkx	0:355018f44c9f	354	*/
dirkx	0:355018f44c9f	355	static err_t
dirkx	0:355018f44c9f	356	igmp_remove_group(struct igmp_group *group)
dirkx	0:355018f44c9f	357	{
dirkx	0:355018f44c9f	358	err_t err = ERR_OK;
dirkx	0:355018f44c9f	359
dirkx	0:355018f44c9f	360	/* Is it the first group? */
dirkx	0:355018f44c9f	361	if (igmp_group_list == group) {
dirkx	0:355018f44c9f	362	igmp_group_list = group->next;
dirkx	0:355018f44c9f	363	} else {
dirkx	0:355018f44c9f	364	/* look for group further down the list */
dirkx	0:355018f44c9f	365	struct igmp_group *tmpGroup;
dirkx	0:355018f44c9f	366	for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
dirkx	0:355018f44c9f	367	if (tmpGroup->next == group) {
dirkx	0:355018f44c9f	368	tmpGroup->next = group->next;
dirkx	0:355018f44c9f	369	break;
dirkx	0:355018f44c9f	370	}
dirkx	0:355018f44c9f	371	}
dirkx	0:355018f44c9f	372	/* Group not found in the global igmp_group_list */
dirkx	0:355018f44c9f	373	if (tmpGroup == NULL)
dirkx	0:355018f44c9f	374	err = ERR_ARG;
dirkx	0:355018f44c9f	375	}
dirkx	0:355018f44c9f	376	/* free group */
dirkx	0:355018f44c9f	377	memp_free(MEMP_IGMP_GROUP, group);
dirkx	0:355018f44c9f	378
dirkx	0:355018f44c9f	379	return err;
dirkx	0:355018f44c9f	380	}
dirkx	0:355018f44c9f	381
dirkx	0:355018f44c9f	382	/**
dirkx	0:355018f44c9f	383	* Called from ip_input() if a new IGMP packet is received.
dirkx	0:355018f44c9f	384	*
dirkx	0:355018f44c9f	385	* @param p received igmp packet, p->payload pointing to the ip header
dirkx	0:355018f44c9f	386	* @param inp network interface on which the packet was received
dirkx	0:355018f44c9f	387	* @param dest destination ip address of the igmp packet
dirkx	0:355018f44c9f	388	*/
dirkx	0:355018f44c9f	389	void
dirkx	0:355018f44c9f	390	igmp_input(struct pbuf p, struct netif inp, ip_addr_t *dest)
dirkx	0:355018f44c9f	391	{
dirkx	0:355018f44c9f	392	struct ip_hdr * iphdr;
dirkx	0:355018f44c9f	393	struct igmp_msg* igmp;
dirkx	0:355018f44c9f	394	struct igmp_group* group;
dirkx	0:355018f44c9f	395	struct igmp_group* groupref;
dirkx	0:355018f44c9f	396
dirkx	0:355018f44c9f	397	IGMP_STATS_INC(igmp.recv);
dirkx	0:355018f44c9f	398
dirkx	0:355018f44c9f	399	/* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
dirkx	2:816cbd922d3e	400	iphdr = (struct ip_hdr *) p->payload;
dirkx	0:355018f44c9f	401	if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) \|\| (p->len < IGMP_MINLEN)) {
dirkx	0:355018f44c9f	402	pbuf_free(p);
dirkx	0:355018f44c9f	403	IGMP_STATS_INC(igmp.lenerr);
dirkx	0:355018f44c9f	404	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
dirkx	0:355018f44c9f	405	return;
dirkx	0:355018f44c9f	406	}
dirkx	0:355018f44c9f	407
dirkx	0:355018f44c9f	408	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
dirkx	0:355018f44c9f	409	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
dirkx	0:355018f44c9f	410	LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
dirkx	0:355018f44c9f	411	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
dirkx	0:355018f44c9f	412	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
dirkx	0:355018f44c9f	413
dirkx	0:355018f44c9f	414	/* Now calculate and check the checksum */
dirkx	0:355018f44c9f	415	igmp = (struct igmp_msg *)p->payload;
dirkx	0:355018f44c9f	416	if (inet_chksum(igmp, p->len)) {
dirkx	0:355018f44c9f	417	pbuf_free(p);
dirkx	0:355018f44c9f	418	IGMP_STATS_INC(igmp.chkerr);
dirkx	0:355018f44c9f	419	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
dirkx	0:355018f44c9f	420	return;
dirkx	0:355018f44c9f	421	}
dirkx	0:355018f44c9f	422
dirkx	0:355018f44c9f	423	/* Packet is ok so find an existing group */
dirkx	0:355018f44c9f	424	group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
dirkx	0:355018f44c9f	425
dirkx	0:355018f44c9f	426	/* If group can be found or create... */
dirkx	0:355018f44c9f	427	if (!group) {
dirkx	0:355018f44c9f	428	pbuf_free(p);
dirkx	0:355018f44c9f	429	IGMP_STATS_INC(igmp.drop);
dirkx	0:355018f44c9f	430	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
dirkx	0:355018f44c9f	431	return;
dirkx	0:355018f44c9f	432	}
dirkx	0:355018f44c9f	433
dirkx	0:355018f44c9f	434	/* NOW ACT ON THE INCOMING MESSAGE TYPE... */
dirkx	0:355018f44c9f	435	switch (igmp->igmp_msgtype) {
dirkx	0:355018f44c9f	436	case IGMP_MEMB_QUERY: {
dirkx	0:355018f44c9f	437	/* IGMP_MEMB_QUERY to the "all systems" address ? */
dirkx	0:355018f44c9f	438	if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
dirkx	0:355018f44c9f	439	/* THIS IS THE GENERAL QUERY */
dirkx	0:355018f44c9f	440	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
dirkx	0:355018f44c9f	441
dirkx	0:355018f44c9f	442	if (igmp->igmp_maxresp == 0) {
dirkx	0:355018f44c9f	443	IGMP_STATS_INC(igmp.rx_v1);
dirkx	0:355018f44c9f	444	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
dirkx	0:355018f44c9f	445	igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
dirkx	0:355018f44c9f	446	}
dirkx	0:355018f44c9f	447	else {
dirkx	0:355018f44c9f	448	IGMP_STATS_INC(igmp.rx_general);
dirkx	0:355018f44c9f	449	}
dirkx	0:355018f44c9f	450
dirkx	0:355018f44c9f	451	groupref = igmp_group_list;
dirkx	0:355018f44c9f	452	while (groupref) {
dirkx	0:355018f44c9f	453	/* Do not send messages on the all systems group address! */
dirkx	0:355018f44c9f	454	if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
dirkx	0:355018f44c9f	455	igmp_delaying_member(groupref, igmp->igmp_maxresp);
dirkx	0:355018f44c9f	456	}
dirkx	0:355018f44c9f	457	groupref = groupref->next;
dirkx	0:355018f44c9f	458	}
dirkx	0:355018f44c9f	459	} else {
dirkx	0:355018f44c9f	460	/* IGMP_MEMB_QUERY to a specific group ? */
dirkx	0:355018f44c9f	461	if (!ip_addr_isany(&igmp->igmp_group_address)) {
dirkx	0:355018f44c9f	462	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
dirkx	0:355018f44c9f	463	ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
dirkx	0:355018f44c9f	464	if (ip_addr_cmp(dest, &allsystems)) {
dirkx	0:355018f44c9f	465	LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
dirkx	0:355018f44c9f	466	/* we first need to re-lookfor the group since we used dest last time */
dirkx	0:355018f44c9f	467	group = igmp_lookfor_group(inp, &igmp->igmp_group_address);
dirkx	0:355018f44c9f	468	} else {
dirkx	0:355018f44c9f	469	LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
dirkx	0:355018f44c9f	470	}
dirkx	0:355018f44c9f	471
dirkx	0:355018f44c9f	472	if (group != NULL) {
dirkx	0:355018f44c9f	473	IGMP_STATS_INC(igmp.rx_group);
dirkx	0:355018f44c9f	474	igmp_delaying_member(group, igmp->igmp_maxresp);
dirkx	0:355018f44c9f	475	}
dirkx	0:355018f44c9f	476	else {
dirkx	0:355018f44c9f	477	IGMP_STATS_INC(igmp.drop);
dirkx	0:355018f44c9f	478	}
dirkx	0:355018f44c9f	479	}
dirkx	0:355018f44c9f	480	else {
dirkx	0:355018f44c9f	481	IGMP_STATS_INC(igmp.proterr);
dirkx	0:355018f44c9f	482	}
dirkx	0:355018f44c9f	483	}
dirkx	0:355018f44c9f	484	break;
dirkx	0:355018f44c9f	485	}
dirkx	0:355018f44c9f	486	case IGMP_V2_MEMB_REPORT: {
dirkx	0:355018f44c9f	487	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
dirkx	0:355018f44c9f	488	IGMP_STATS_INC(igmp.rx_report);
dirkx	0:355018f44c9f	489	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
dirkx	0:355018f44c9f	490	/* This is on a specific group we have already looked up */
dirkx	0:355018f44c9f	491	group->timer = 0; /* stopped */
dirkx	0:355018f44c9f	492	group->group_state = IGMP_GROUP_IDLE_MEMBER;
dirkx	0:355018f44c9f	493	group->last_reporter_flag = 0;
dirkx	0:355018f44c9f	494	}
dirkx	0:355018f44c9f	495	break;
dirkx	0:355018f44c9f	496	}
dirkx	0:355018f44c9f	497	default: {
dirkx	0:355018f44c9f	498	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
dirkx	0:355018f44c9f	499	igmp->igmp_msgtype, group->group_state, &group, group->netif));
dirkx	0:355018f44c9f	500	IGMP_STATS_INC(igmp.proterr);
dirkx	0:355018f44c9f	501	break;
dirkx	0:355018f44c9f	502	}
dirkx	0:355018f44c9f	503	}
dirkx	0:355018f44c9f	504
dirkx	0:355018f44c9f	505	pbuf_free(p);
dirkx	0:355018f44c9f	506	return;
dirkx	0:355018f44c9f	507	}
dirkx	0:355018f44c9f	508
dirkx	0:355018f44c9f	509	/**
dirkx	0:355018f44c9f	510	* Join a group on one network interface.
dirkx	0:355018f44c9f	511	*
dirkx	0:355018f44c9f	512	* @param ifaddr ip address of the network interface which should join a new group
dirkx	0:355018f44c9f	513	* @param groupaddr the ip address of the group which to join
dirkx	0:355018f44c9f	514	* @return ERR_OK if group was joined on the netif(s), an err_t otherwise
dirkx	0:355018f44c9f	515	*/
dirkx	0:355018f44c9f	516	err_t
dirkx	0:355018f44c9f	517	igmp_joingroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
dirkx	0:355018f44c9f	518	{
dirkx	0:355018f44c9f	519	err_t err = ERR_VAL; /* no matching interface */
dirkx	0:355018f44c9f	520	struct igmp_group *group;
dirkx	0:355018f44c9f	521	struct netif *netif;
dirkx	0:355018f44c9f	522
dirkx	0:355018f44c9f	523	/* make sure it is multicast address */
dirkx	0:355018f44c9f	524	LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
dirkx	0:355018f44c9f	525	LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
dirkx	0:355018f44c9f	526
dirkx	0:355018f44c9f	527	/* loop through netif's */
dirkx	0:355018f44c9f	528	netif = netif_list;
dirkx	0:355018f44c9f	529	while (netif != NULL) {
dirkx	0:355018f44c9f	530	/* Should we join this interface ? */
dirkx	0:355018f44c9f	531	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
dirkx	0:355018f44c9f	532	/* find group or create a new one if not found */
dirkx	0:355018f44c9f	533	group = igmp_lookup_group(netif, groupaddr);
dirkx	0:355018f44c9f	534
dirkx	0:355018f44c9f	535	if (group != NULL) {
dirkx	0:355018f44c9f	536	/* This should create a new group, check the state to make sure */
dirkx	0:355018f44c9f	537	if (group->group_state != IGMP_GROUP_NON_MEMBER) {
dirkx	0:355018f44c9f	538	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
dirkx	0:355018f44c9f	539	} else {
dirkx	0:355018f44c9f	540	/* OK - it was new group */
dirkx	0:355018f44c9f	541	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
dirkx	0:355018f44c9f	542	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
dirkx	0:355018f44c9f	543	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
dirkx	0:355018f44c9f	544
dirkx	0:355018f44c9f	545	/* If first use of the group, allow the group at the MAC level */
dirkx	0:355018f44c9f	546	if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
dirkx	0:355018f44c9f	547	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
dirkx	0:355018f44c9f	548	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
dirkx	0:355018f44c9f	549	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
dirkx	0:355018f44c9f	550	netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
dirkx	0:355018f44c9f	551	}
dirkx	0:355018f44c9f	552
dirkx	0:355018f44c9f	553	IGMP_STATS_INC(igmp.tx_join);
dirkx	0:355018f44c9f	554	igmp_send(group, IGMP_V2_MEMB_REPORT);
dirkx	0:355018f44c9f	555
dirkx	0:355018f44c9f	556	igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
dirkx	0:355018f44c9f	557
dirkx	0:355018f44c9f	558	/* Need to work out where this timer comes from */
dirkx	0:355018f44c9f	559	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
dirkx	0:355018f44c9f	560	}
dirkx	0:355018f44c9f	561	/* Increment group use */
dirkx	0:355018f44c9f	562	group->use++;
dirkx	0:355018f44c9f	563	/* Join on this interface */
dirkx	0:355018f44c9f	564	err = ERR_OK;
dirkx	0:355018f44c9f	565	} else {
dirkx	0:355018f44c9f	566	/* Return an error even if some network interfaces are joined */
dirkx	0:355018f44c9f	567	/** @todo undo any other netif already joined */
dirkx	0:355018f44c9f	568	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
dirkx	0:355018f44c9f	569	return ERR_MEM;
dirkx	0:355018f44c9f	570	}
dirkx	0:355018f44c9f	571	}
dirkx	0:355018f44c9f	572	/* proceed to next network interface */
dirkx	0:355018f44c9f	573	netif = netif->next;
dirkx	0:355018f44c9f	574	}
dirkx	0:355018f44c9f	575
dirkx	0:355018f44c9f	576	return err;
dirkx	0:355018f44c9f	577	}
dirkx	0:355018f44c9f	578
dirkx	0:355018f44c9f	579	/**
dirkx	0:355018f44c9f	580	* Leave a group on one network interface.
dirkx	0:355018f44c9f	581	*
dirkx	0:355018f44c9f	582	* @param ifaddr ip address of the network interface which should leave a group
dirkx	0:355018f44c9f	583	* @param groupaddr the ip address of the group which to leave
dirkx	0:355018f44c9f	584	* @return ERR_OK if group was left on the netif(s), an err_t otherwise
dirkx	0:355018f44c9f	585	*/
dirkx	0:355018f44c9f	586	err_t
dirkx	0:355018f44c9f	587	igmp_leavegroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
dirkx	0:355018f44c9f	588	{
dirkx	0:355018f44c9f	589	err_t err = ERR_VAL; /* no matching interface */
dirkx	0:355018f44c9f	590	struct igmp_group *group;
dirkx	0:355018f44c9f	591	struct netif *netif;
dirkx	0:355018f44c9f	592
dirkx	0:355018f44c9f	593	/* make sure it is multicast address */
dirkx	0:355018f44c9f	594	LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
dirkx	0:355018f44c9f	595	LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
dirkx	0:355018f44c9f	596
dirkx	0:355018f44c9f	597	/* loop through netif's */
dirkx	0:355018f44c9f	598	netif = netif_list;
dirkx	0:355018f44c9f	599	while (netif != NULL) {
dirkx	0:355018f44c9f	600	/* Should we leave this interface ? */
dirkx	0:355018f44c9f	601	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
dirkx	0:355018f44c9f	602	/* find group */
dirkx	0:355018f44c9f	603	group = igmp_lookfor_group(netif, groupaddr);
dirkx	0:355018f44c9f	604
dirkx	0:355018f44c9f	605	if (group != NULL) {
dirkx	0:355018f44c9f	606	/* Only send a leave if the flag is set according to the state diagram */
dirkx	0:355018f44c9f	607	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
dirkx	0:355018f44c9f	608	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
dirkx	0:355018f44c9f	609	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
dirkx	0:355018f44c9f	610
dirkx	0:355018f44c9f	611	/* If there is no other use of the group */
dirkx	0:355018f44c9f	612	if (group->use <= 1) {
dirkx	0:355018f44c9f	613	/* If we are the last reporter for this group */
dirkx	0:355018f44c9f	614	if (group->last_reporter_flag) {
dirkx	0:355018f44c9f	615	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
dirkx	0:355018f44c9f	616	IGMP_STATS_INC(igmp.tx_leave);
dirkx	0:355018f44c9f	617	igmp_send(group, IGMP_LEAVE_GROUP);
dirkx	0:355018f44c9f	618	}
dirkx	0:355018f44c9f	619
dirkx	0:355018f44c9f	620	/* Disable the group at the MAC level */
dirkx	0:355018f44c9f	621	if (netif->igmp_mac_filter != NULL) {
dirkx	0:355018f44c9f	622	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
dirkx	0:355018f44c9f	623	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
dirkx	0:355018f44c9f	624	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
dirkx	0:355018f44c9f	625	netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
dirkx	0:355018f44c9f	626	}
dirkx	0:355018f44c9f	627
dirkx	0:355018f44c9f	628	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
dirkx	0:355018f44c9f	629	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
dirkx	0:355018f44c9f	630	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
dirkx	0:355018f44c9f	631
dirkx	0:355018f44c9f	632	/* Free the group */
dirkx	0:355018f44c9f	633	igmp_remove_group(group);
dirkx	0:355018f44c9f	634	} else {
dirkx	0:355018f44c9f	635	/* Decrement group use */
dirkx	0:355018f44c9f	636	group->use--;
dirkx	0:355018f44c9f	637	}
dirkx	0:355018f44c9f	638	/* Leave on this interface */
dirkx	0:355018f44c9f	639	err = ERR_OK;
dirkx	0:355018f44c9f	640	} else {
dirkx	0:355018f44c9f	641	/* It's not a fatal error on "leavegroup" */
dirkx	0:355018f44c9f	642	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
dirkx	0:355018f44c9f	643	}
dirkx	0:355018f44c9f	644	}
dirkx	0:355018f44c9f	645	/* proceed to next network interface */
dirkx	0:355018f44c9f	646	netif = netif->next;
dirkx	0:355018f44c9f	647	}
dirkx	0:355018f44c9f	648
dirkx	0:355018f44c9f	649	return err;
dirkx	0:355018f44c9f	650	}
dirkx	0:355018f44c9f	651
dirkx	0:355018f44c9f	652	/**
dirkx	0:355018f44c9f	653	* The igmp timer function (both for NO_SYS=1 and =0)
dirkx	0:355018f44c9f	654	* Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
dirkx	0:355018f44c9f	655	*/
dirkx	0:355018f44c9f	656	void
dirkx	0:355018f44c9f	657	igmp_tmr(void)
dirkx	0:355018f44c9f	658	{
dirkx	0:355018f44c9f	659	struct igmp_group *group = igmp_group_list;
dirkx	0:355018f44c9f	660
dirkx	0:355018f44c9f	661	while (group != NULL) {
dirkx	0:355018f44c9f	662	if (group->timer > 0) {
dirkx	0:355018f44c9f	663	group->timer--;
dirkx	0:355018f44c9f	664	if (group->timer == 0) {
dirkx	0:355018f44c9f	665	igmp_timeout(group);
dirkx	0:355018f44c9f	666	}
dirkx	0:355018f44c9f	667	}
dirkx	0:355018f44c9f	668	group = group->next;
dirkx	0:355018f44c9f	669	}
dirkx	0:355018f44c9f	670	}
dirkx	0:355018f44c9f	671
dirkx	0:355018f44c9f	672	/**
dirkx	0:355018f44c9f	673	* Called if a timeout for one group is reached.
dirkx	0:355018f44c9f	674	* Sends a report for this group.
dirkx	0:355018f44c9f	675	*
dirkx	0:355018f44c9f	676	* @param group an igmp_group for which a timeout is reached
dirkx	0:355018f44c9f	677	*/
dirkx	0:355018f44c9f	678	static void
dirkx	0:355018f44c9f	679	igmp_timeout(struct igmp_group *group)
dirkx	0:355018f44c9f	680	{
dirkx	0:355018f44c9f	681	/* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
dirkx	0:355018f44c9f	682	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
dirkx	0:355018f44c9f	683	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
dirkx	0:355018f44c9f	684	ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
dirkx	0:355018f44c9f	685	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
dirkx	0:355018f44c9f	686
dirkx	0:355018f44c9f	687	IGMP_STATS_INC(igmp.tx_report);
dirkx	0:355018f44c9f	688	igmp_send(group, IGMP_V2_MEMB_REPORT);
dirkx	0:355018f44c9f	689	}
dirkx	0:355018f44c9f	690	}
dirkx	0:355018f44c9f	691
dirkx	0:355018f44c9f	692	/**
dirkx	0:355018f44c9f	693	* Start a timer for an igmp group
dirkx	0:355018f44c9f	694	*
dirkx	0:355018f44c9f	695	* @param group the igmp_group for which to start a timer
dirkx	0:355018f44c9f	696	* @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
dirkx	0:355018f44c9f	697	* every call to igmp_tmr())
dirkx	0:355018f44c9f	698	*/
dirkx	0:355018f44c9f	699	static void
dirkx	0:355018f44c9f	700	igmp_start_timer(struct igmp_group *group, u8_t max_time)
dirkx	0:355018f44c9f	701	{
dirkx	0:355018f44c9f	702	/* ensure the input value is > 0 */
dirkx	0:355018f44c9f	703	if (max_time == 0) {
dirkx	0:355018f44c9f	704	max_time = 1;
dirkx	0:355018f44c9f	705	}
dirkx	0:355018f44c9f	706	/* ensure the random value is > 0 */
dirkx	0:355018f44c9f	707	group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
dirkx	0:355018f44c9f	708	}
dirkx	0:355018f44c9f	709
dirkx	0:355018f44c9f	710	/**
dirkx	0:355018f44c9f	711	* Stop a timer for an igmp_group
dirkx	0:355018f44c9f	712	*
dirkx	0:355018f44c9f	713	* @param group the igmp_group for which to stop the timer
dirkx	0:355018f44c9f	714	*/
dirkx	0:355018f44c9f	715	static void
dirkx	0:355018f44c9f	716	igmp_stop_timer(struct igmp_group *group)
dirkx	0:355018f44c9f	717	{
dirkx	2:816cbd922d3e	718	group->timer = 0;
dirkx	0:355018f44c9f	719	}
dirkx	0:355018f44c9f	720
dirkx	0:355018f44c9f	721	/**
dirkx	0:355018f44c9f	722	* Delaying membership report for a group if necessary
dirkx	0:355018f44c9f	723	*
dirkx	0:355018f44c9f	724	* @param group the igmp_group for which "delaying" membership report
dirkx	0:355018f44c9f	725	* @param maxresp query delay
dirkx	0:355018f44c9f	726	*/
dirkx	0:355018f44c9f	727	static void
dirkx	0:355018f44c9f	728	igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
dirkx	0:355018f44c9f	729	{
dirkx	0:355018f44c9f	730	if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) \|\|
dirkx	0:355018f44c9f	731	((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
dirkx	0:355018f44c9f	732	((group->timer == 0) \|\| (maxresp < group->timer)))) {
dirkx	0:355018f44c9f	733	igmp_start_timer(group, maxresp);
dirkx	0:355018f44c9f	734	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
dirkx	0:355018f44c9f	735	}
dirkx	0:355018f44c9f	736	}
dirkx	0:355018f44c9f	737
dirkx	0:355018f44c9f	738
dirkx	0:355018f44c9f	739	/**
dirkx	0:355018f44c9f	740	* Sends an IP packet on a network interface. This function constructs the IP header
dirkx	0:355018f44c9f	741	* and calculates the IP header checksum. If the source IP address is NULL,
dirkx	0:355018f44c9f	742	* the IP address of the outgoing network interface is filled in as source address.
dirkx	0:355018f44c9f	743	*
dirkx	0:355018f44c9f	744	* @param p the packet to send (p->payload points to the data, e.g. next
dirkx	0:355018f44c9f	745	protocol header; if dest == IP_HDRINCL, p already includes an IP
dirkx	0:355018f44c9f	746	header and p->payload points to that IP header)
dirkx	0:355018f44c9f	747	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
dirkx	0:355018f44c9f	748	* IP address of the netif used to send is used as source address)
dirkx	0:355018f44c9f	749	* @param dest the destination IP address to send the packet to
dirkx	0:355018f44c9f	750	* @param ttl the TTL value to be set in the IP header
dirkx	0:355018f44c9f	751	* @param proto the PROTOCOL to be set in the IP header
dirkx	0:355018f44c9f	752	* @param netif the netif on which to send this packet
dirkx	0:355018f44c9f	753	* @return ERR_OK if the packet was sent OK
dirkx	0:355018f44c9f	754	* ERR_BUF if p doesn't have enough space for IP/LINK headers
dirkx	0:355018f44c9f	755	* returns errors returned by netif->output
dirkx	0:355018f44c9f	756	*/
dirkx	0:355018f44c9f	757	static err_t
dirkx	0:355018f44c9f	758	igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif)
dirkx	0:355018f44c9f	759	{
dirkx	0:355018f44c9f	760	/* This is the "router alert" option */
dirkx	0:355018f44c9f	761	u16_t ra[2];
dirkx	0:355018f44c9f	762	ra[0] = htons(ROUTER_ALERT);
dirkx	0:355018f44c9f	763	ra[1] = 0x0000; /* Router shall examine packet */
dirkx	0:355018f44c9f	764	IGMP_STATS_INC(igmp.xmit);
dirkx	0:355018f44c9f	765	return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
dirkx	0:355018f44c9f	766	}
dirkx	0:355018f44c9f	767
dirkx	0:355018f44c9f	768	/**
dirkx	0:355018f44c9f	769	* Send an igmp packet to a specific group.
dirkx	0:355018f44c9f	770	*
dirkx	0:355018f44c9f	771	* @param group the group to which to send the packet
dirkx	0:355018f44c9f	772	* @param type the type of igmp packet to send
dirkx	0:355018f44c9f	773	*/
dirkx	0:355018f44c9f	774	static void
dirkx	0:355018f44c9f	775	igmp_send(struct igmp_group *group, u8_t type)
dirkx	0:355018f44c9f	776	{
dirkx	0:355018f44c9f	777	struct pbuf* p = NULL;
dirkx	0:355018f44c9f	778	struct igmp_msg* igmp = NULL;
dirkx	0:355018f44c9f	779	ip_addr_t src = *IP_ADDR_ANY;
dirkx	0:355018f44c9f	780	ip_addr_t* dest = NULL;
dirkx	0:355018f44c9f	781
dirkx	0:355018f44c9f	782	/* IP header + "router alert" option + IGMP header */
dirkx	0:355018f44c9f	783	p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
dirkx	0:355018f44c9f	784
dirkx	0:355018f44c9f	785	if (p) {
dirkx	2:816cbd922d3e	786	igmp = (struct igmp_msg*) p->payload;
dirkx	0:355018f44c9f	787	LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
dirkx	0:355018f44c9f	788	(p->len >= sizeof(struct igmp_msg)));
dirkx	0:355018f44c9f	789	ip_addr_copy(src, group->netif->ip_addr);
dirkx	0:355018f44c9f	790
dirkx	0:355018f44c9f	791	if (type == IGMP_V2_MEMB_REPORT) {
dirkx	0:355018f44c9f	792	dest = &(group->group_address);
dirkx	0:355018f44c9f	793	ip_addr_copy(igmp->igmp_group_address, group->group_address);
dirkx	0:355018f44c9f	794	group->last_reporter_flag = 1; /* Remember we were the last to report */
dirkx	0:355018f44c9f	795	} else {
dirkx	0:355018f44c9f	796	if (type == IGMP_LEAVE_GROUP) {
dirkx	0:355018f44c9f	797	dest = &allrouters;
dirkx	0:355018f44c9f	798	ip_addr_copy(igmp->igmp_group_address, group->group_address);
dirkx	0:355018f44c9f	799	}
dirkx	0:355018f44c9f	800	}
dirkx	0:355018f44c9f	801
dirkx	0:355018f44c9f	802	if ((type == IGMP_V2_MEMB_REPORT) \|\| (type == IGMP_LEAVE_GROUP)) {
dirkx	0:355018f44c9f	803	igmp->igmp_msgtype = type;
dirkx	0:355018f44c9f	804	igmp->igmp_maxresp = 0;
dirkx	0:355018f44c9f	805	igmp->igmp_checksum = 0;
dirkx	0:355018f44c9f	806	igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
dirkx	0:355018f44c9f	807
dirkx	0:355018f44c9f	808	igmp_ip_output_if(p, &src, dest, group->netif);
dirkx	0:355018f44c9f	809	}
dirkx	0:355018f44c9f	810
dirkx	0:355018f44c9f	811	pbuf_free(p);
dirkx	0:355018f44c9f	812	} else {
dirkx	0:355018f44c9f	813	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
dirkx	0:355018f44c9f	814	IGMP_STATS_INC(igmp.memerr);
dirkx	0:355018f44c9f	815	}
dirkx	0:355018f44c9f	816	}
dirkx	0:355018f44c9f	817
dirkx	0:355018f44c9f	818	#endif /* LWIP_IGMP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	21 Jul 2010
Imports:	99
Forks:	0
Commits:	6
Dependents:	0
Dependencies:	1
Followers:	8

lwip/core/ipv4/igmp.c@2:816cbd922d3e, 2010-07-24 (annotated)

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