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lwip/core/ipv4/igmp.c@0:ac1725ba162c, 2010-11-09 (annotated)

Committer:: segundo
Date:: Tue Nov 09 20:54:15 2010 +0000
Revision:: 0:ac1725ba162c

Who changed what in which revision?

User	Revision	Line number	New contents of line
segundo	0:ac1725ba162c	1	#pragma diag_remark 177
segundo	0:ac1725ba162c	2	/**
segundo	0:ac1725ba162c	3	* @file
segundo	0:ac1725ba162c	4	* IGMP - Internet Group Management Protocol
segundo	0:ac1725ba162c	5	*
segundo	0:ac1725ba162c	6	*/
segundo	0:ac1725ba162c	7
segundo	0:ac1725ba162c	8	/*
segundo	0:ac1725ba162c	9	* Copyright (c) 2002 CITEL Technologies Ltd.
segundo	0:ac1725ba162c	10	* All rights reserved.
segundo	0:ac1725ba162c	11	*
segundo	0:ac1725ba162c	12	* Redistribution and use in source and binary forms, with or without
segundo	0:ac1725ba162c	13	* modification, are permitted provided that the following conditions
segundo	0:ac1725ba162c	14	* are met:
segundo	0:ac1725ba162c	15	* 1. Redistributions of source code must retain the above copyright
segundo	0:ac1725ba162c	16	* notice, this list of conditions and the following disclaimer.
segundo	0:ac1725ba162c	17	* 2. Redistributions in binary form must reproduce the above copyright
segundo	0:ac1725ba162c	18	* notice, this list of conditions and the following disclaimer in the
segundo	0:ac1725ba162c	19	* documentation and/or other materials provided with the distribution.
segundo	0:ac1725ba162c	20	* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
segundo	0:ac1725ba162c	21	* may be used to endorse or promote products derived from this software
segundo	0:ac1725ba162c	22	* without specific prior written permission.
segundo	0:ac1725ba162c	23	*
segundo	0:ac1725ba162c	24	* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
segundo	0:ac1725ba162c	25	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
segundo	0:ac1725ba162c	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
segundo	0:ac1725ba162c	27	* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
segundo	0:ac1725ba162c	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
segundo	0:ac1725ba162c	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
segundo	0:ac1725ba162c	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
segundo	0:ac1725ba162c	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
segundo	0:ac1725ba162c	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
segundo	0:ac1725ba162c	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
segundo	0:ac1725ba162c	34	* SUCH DAMAGE.
segundo	0:ac1725ba162c	35	*
segundo	0:ac1725ba162c	36	* This file is a contribution to the lwIP TCP/IP stack.
segundo	0:ac1725ba162c	37	* The Swedish Institute of Computer Science and Adam Dunkels
segundo	0:ac1725ba162c	38	* are specifically granted permission to redistribute this
segundo	0:ac1725ba162c	39	* source code.
segundo	0:ac1725ba162c	40	*/
segundo	0:ac1725ba162c	41
segundo	0:ac1725ba162c	42	/*-------------------------------------------------------------
segundo	0:ac1725ba162c	43	Note 1)
segundo	0:ac1725ba162c	44	Although the rfc requires V1 AND V2 capability
segundo	0:ac1725ba162c	45	we will only support v2 since now V1 is very old (August 1989)
segundo	0:ac1725ba162c	46	V1 can be added if required
segundo	0:ac1725ba162c	47
segundo	0:ac1725ba162c	48	a debug print and statistic have been implemented to
segundo	0:ac1725ba162c	49	show this up.
segundo	0:ac1725ba162c	50	-------------------------------------------------------------
segundo	0:ac1725ba162c	51	-------------------------------------------------------------
segundo	0:ac1725ba162c	52	Note 2)
segundo	0:ac1725ba162c	53	A query for a specific group address (as opposed to ALLHOSTS)
segundo	0:ac1725ba162c	54	has now been implemented as I am unsure if it is required
segundo	0:ac1725ba162c	55
segundo	0:ac1725ba162c	56	a debug print and statistic have been implemented to
segundo	0:ac1725ba162c	57	show this up.
segundo	0:ac1725ba162c	58	-------------------------------------------------------------
segundo	0:ac1725ba162c	59	-------------------------------------------------------------
segundo	0:ac1725ba162c	60	Note 3)
segundo	0:ac1725ba162c	61	The router alert rfc 2113 is implemented in outgoing packets
segundo	0:ac1725ba162c	62	but not checked rigorously incoming
segundo	0:ac1725ba162c	63	-------------------------------------------------------------
segundo	0:ac1725ba162c	64	Steve Reynolds
segundo	0:ac1725ba162c	65	------------------------------------------------------------*/
segundo	0:ac1725ba162c	66
segundo	0:ac1725ba162c	67	/*-----------------------------------------------------------------------------
segundo	0:ac1725ba162c	68	* RFC 988 - Host extensions for IP multicasting - V0
segundo	0:ac1725ba162c	69	* RFC 1054 - Host extensions for IP multicasting -
segundo	0:ac1725ba162c	70	* RFC 1112 - Host extensions for IP multicasting - V1
segundo	0:ac1725ba162c	71	* RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
segundo	0:ac1725ba162c	72	* RFC 3376 - Internet Group Management Protocol, Version 3 - V3
segundo	0:ac1725ba162c	73	* RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
segundo	0:ac1725ba162c	74	* RFC 2113 - IP Router Alert Option -
segundo	0:ac1725ba162c	75	----------------------------------------------------------------------------/
segundo	0:ac1725ba162c	76
segundo	0:ac1725ba162c	77	/*-----------------------------------------------------------------------------
segundo	0:ac1725ba162c	78	* Includes
segundo	0:ac1725ba162c	79	----------------------------------------------------------------------------/
segundo	0:ac1725ba162c	80
segundo	0:ac1725ba162c	81	#include "lwip/opt.h"
segundo	0:ac1725ba162c	82
segundo	0:ac1725ba162c	83	#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
segundo	0:ac1725ba162c	84
segundo	0:ac1725ba162c	85	#include "lwip/igmp.h"
segundo	0:ac1725ba162c	86	#include "lwip/debug.h"
segundo	0:ac1725ba162c	87	#include "lwip/def.h"
segundo	0:ac1725ba162c	88	#include "lwip/mem.h"
segundo	0:ac1725ba162c	89	#include "lwip/ip.h"
segundo	0:ac1725ba162c	90	#include "lwip/inet_chksum.h"
segundo	0:ac1725ba162c	91	#include "lwip/netif.h"
segundo	0:ac1725ba162c	92	#include "lwip/icmp.h"
segundo	0:ac1725ba162c	93	#include "lwip/udp.h"
segundo	0:ac1725ba162c	94	#include "lwip/tcp.h"
segundo	0:ac1725ba162c	95	#include "lwip/stats.h"
segundo	0:ac1725ba162c	96
segundo	0:ac1725ba162c	97	#include "string.h"
segundo	0:ac1725ba162c	98
segundo	0:ac1725ba162c	99	/*
segundo	0:ac1725ba162c	100	* IGMP constants
segundo	0:ac1725ba162c	101	*/
segundo	0:ac1725ba162c	102	#define IGMP_TTL 1
segundo	0:ac1725ba162c	103	#define IGMP_MINLEN 8
segundo	0:ac1725ba162c	104	#define ROUTER_ALERT 0x9404
segundo	0:ac1725ba162c	105	#define ROUTER_ALERTLEN 4
segundo	0:ac1725ba162c	106
segundo	0:ac1725ba162c	107	/*
segundo	0:ac1725ba162c	108	* IGMP message types, including version number.
segundo	0:ac1725ba162c	109	*/
segundo	0:ac1725ba162c	110	#define IGMP_MEMB_QUERY 0x11 /* Membership query */
segundo	0:ac1725ba162c	111	#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
segundo	0:ac1725ba162c	112	#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
segundo	0:ac1725ba162c	113	#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
segundo	0:ac1725ba162c	114
segundo	0:ac1725ba162c	115	/* Group membership states */
segundo	0:ac1725ba162c	116	#define IGMP_GROUP_NON_MEMBER 0
segundo	0:ac1725ba162c	117	#define IGMP_GROUP_DELAYING_MEMBER 1
segundo	0:ac1725ba162c	118	#define IGMP_GROUP_IDLE_MEMBER 2
segundo	0:ac1725ba162c	119
segundo	0:ac1725ba162c	120	/**
segundo	0:ac1725ba162c	121	* IGMP packet format.
segundo	0:ac1725ba162c	122	*/
segundo	0:ac1725ba162c	123	#ifdef PACK_STRUCT_USE_INCLUDES
segundo	0:ac1725ba162c	124	# include "arch/bpstruct.h"
segundo	0:ac1725ba162c	125	#endif
segundo	0:ac1725ba162c	126	PACK_STRUCT_BEGIN
segundo	0:ac1725ba162c	127	struct igmp_msg {
segundo	0:ac1725ba162c	128	PACK_STRUCT_FIELD(u8_t igmp_msgtype);
segundo	0:ac1725ba162c	129	PACK_STRUCT_FIELD(u8_t igmp_maxresp);
segundo	0:ac1725ba162c	130	PACK_STRUCT_FIELD(u16_t igmp_checksum);
segundo	0:ac1725ba162c	131	PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
segundo	0:ac1725ba162c	132	} PACK_STRUCT_STRUCT;
segundo	0:ac1725ba162c	133	PACK_STRUCT_END
segundo	0:ac1725ba162c	134	#ifdef PACK_STRUCT_USE_INCLUDES
segundo	0:ac1725ba162c	135	# include "arch/epstruct.h"
segundo	0:ac1725ba162c	136	#endif
segundo	0:ac1725ba162c	137
segundo	0:ac1725ba162c	138
segundo	0:ac1725ba162c	139	static struct igmp_group igmp_lookup_group(struct netif ifp, ip_addr_t *addr);
segundo	0:ac1725ba162c	140	static err_t igmp_remove_group(struct igmp_group *group);
segundo	0:ac1725ba162c	141	static void igmp_timeout( struct igmp_group *group);
segundo	0:ac1725ba162c	142	static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
segundo	0:ac1725ba162c	143	static void igmp_stop_timer(struct igmp_group *group);
segundo	0:ac1725ba162c	144	static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
segundo	0:ac1725ba162c	145	static err_t igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif);
segundo	0:ac1725ba162c	146	static void igmp_send(struct igmp_group *group, u8_t type);
segundo	0:ac1725ba162c	147
segundo	0:ac1725ba162c	148
segundo	0:ac1725ba162c	149	static struct igmp_group* igmp_group_list;
segundo	0:ac1725ba162c	150	static ip_addr_t allsystems;
segundo	0:ac1725ba162c	151	static ip_addr_t allrouters;
segundo	0:ac1725ba162c	152
segundo	0:ac1725ba162c	153
segundo	0:ac1725ba162c	154	/**
segundo	0:ac1725ba162c	155	* Initialize the IGMP module
segundo	0:ac1725ba162c	156	*/
segundo	0:ac1725ba162c	157	void
segundo	0:ac1725ba162c	158	igmp_init(void)
segundo	0:ac1725ba162c	159	{
segundo	0:ac1725ba162c	160	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
segundo	0:ac1725ba162c	161
segundo	0:ac1725ba162c	162	IP4_ADDR(&allsystems, 224, 0, 0, 1);
segundo	0:ac1725ba162c	163	IP4_ADDR(&allrouters, 224, 0, 0, 2);
segundo	0:ac1725ba162c	164	}
segundo	0:ac1725ba162c	165
segundo	0:ac1725ba162c	166	#ifdef LWIP_DEBUG
segundo	0:ac1725ba162c	167	/**
segundo	0:ac1725ba162c	168	* Dump global IGMP groups list
segundo	0:ac1725ba162c	169	*/
segundo	0:ac1725ba162c	170	void
segundo	0:ac1725ba162c	171	igmp_dump_group_list()
segundo	0:ac1725ba162c	172	{
segundo	0:ac1725ba162c	173	struct igmp_group *group = igmp_group_list;
segundo	0:ac1725ba162c	174
segundo	0:ac1725ba162c	175	while (group != NULL) {
segundo	0:ac1725ba162c	176	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
segundo	0:ac1725ba162c	177	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
segundo	0:ac1725ba162c	178	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
segundo	0:ac1725ba162c	179	group = group->next;
segundo	0:ac1725ba162c	180	}
segundo	0:ac1725ba162c	181	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
segundo	0:ac1725ba162c	182	}
segundo	0:ac1725ba162c	183	#else
segundo	0:ac1725ba162c	184	#define igmp_dump_group_list()
segundo	0:ac1725ba162c	185	#endif /* LWIP_DEBUG */
segundo	0:ac1725ba162c	186
segundo	0:ac1725ba162c	187	/**
segundo	0:ac1725ba162c	188	* Start IGMP processing on interface
segundo	0:ac1725ba162c	189	*
segundo	0:ac1725ba162c	190	* @param netif network interface on which start IGMP processing
segundo	0:ac1725ba162c	191	*/
segundo	0:ac1725ba162c	192	err_t
segundo	0:ac1725ba162c	193	igmp_start(struct netif *netif)
segundo	0:ac1725ba162c	194	{
segundo	0:ac1725ba162c	195	struct igmp_group* group;
segundo	0:ac1725ba162c	196
segundo	0:ac1725ba162c	197	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
segundo	0:ac1725ba162c	198
segundo	0:ac1725ba162c	199	group = igmp_lookup_group(netif, &allsystems);
segundo	0:ac1725ba162c	200
segundo	0:ac1725ba162c	201	if (group != NULL) {
segundo	0:ac1725ba162c	202	group->group_state = IGMP_GROUP_IDLE_MEMBER;
segundo	0:ac1725ba162c	203	group->use++;
segundo	0:ac1725ba162c	204
segundo	0:ac1725ba162c	205	/* Allow the igmp messages at the MAC level */
segundo	0:ac1725ba162c	206	if (netif->igmp_mac_filter != NULL) {
segundo	0:ac1725ba162c	207	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
segundo	0:ac1725ba162c	208	ip_addr_debug_print(IGMP_DEBUG, &allsystems);
segundo	0:ac1725ba162c	209	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
segundo	0:ac1725ba162c	210	netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
segundo	0:ac1725ba162c	211	}
segundo	0:ac1725ba162c	212
segundo	0:ac1725ba162c	213	return ERR_OK;
segundo	0:ac1725ba162c	214	}
segundo	0:ac1725ba162c	215
segundo	0:ac1725ba162c	216	return ERR_MEM;
segundo	0:ac1725ba162c	217	}
segundo	0:ac1725ba162c	218
segundo	0:ac1725ba162c	219	/**
segundo	0:ac1725ba162c	220	* Stop IGMP processing on interface
segundo	0:ac1725ba162c	221	*
segundo	0:ac1725ba162c	222	* @param netif network interface on which stop IGMP processing
segundo	0:ac1725ba162c	223	*/
segundo	0:ac1725ba162c	224	err_t
segundo	0:ac1725ba162c	225	igmp_stop(struct netif *netif)
segundo	0:ac1725ba162c	226	{
segundo	0:ac1725ba162c	227	struct igmp_group *group = igmp_group_list;
segundo	0:ac1725ba162c	228	struct igmp_group *prev = NULL;
segundo	0:ac1725ba162c	229	struct igmp_group *next;
segundo	0:ac1725ba162c	230
segundo	0:ac1725ba162c	231	/* look for groups joined on this interface further down the list */
segundo	0:ac1725ba162c	232	while (group != NULL) {
segundo	0:ac1725ba162c	233	next = group->next;
segundo	0:ac1725ba162c	234	/* is it a group joined on this interface? */
segundo	0:ac1725ba162c	235	if (group->netif == netif) {
segundo	0:ac1725ba162c	236	/* is it the first group of the list? */
segundo	0:ac1725ba162c	237	if (group == igmp_group_list) {
segundo	0:ac1725ba162c	238	igmp_group_list = next;
segundo	0:ac1725ba162c	239	}
segundo	0:ac1725ba162c	240	/* is there a "previous" group defined? */
segundo	0:ac1725ba162c	241	if (prev != NULL) {
segundo	0:ac1725ba162c	242	prev->next = next;
segundo	0:ac1725ba162c	243	}
segundo	0:ac1725ba162c	244	/* disable the group at the MAC level */
segundo	0:ac1725ba162c	245	if (netif->igmp_mac_filter != NULL) {
segundo	0:ac1725ba162c	246	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
segundo	0:ac1725ba162c	247	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
segundo	0:ac1725ba162c	248	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
segundo	0:ac1725ba162c	249	netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
segundo	0:ac1725ba162c	250	}
segundo	0:ac1725ba162c	251	/* free group */
segundo	0:ac1725ba162c	252	memp_free(MEMP_IGMP_GROUP, group);
segundo	0:ac1725ba162c	253	} else {
segundo	0:ac1725ba162c	254	/* change the "previous" */
segundo	0:ac1725ba162c	255	prev = group;
segundo	0:ac1725ba162c	256	}
segundo	0:ac1725ba162c	257	/* move to "next" */
segundo	0:ac1725ba162c	258	group = next;
segundo	0:ac1725ba162c	259	}
segundo	0:ac1725ba162c	260	return ERR_OK;
segundo	0:ac1725ba162c	261	}
segundo	0:ac1725ba162c	262
segundo	0:ac1725ba162c	263	/**
segundo	0:ac1725ba162c	264	* Report IGMP memberships for this interface
segundo	0:ac1725ba162c	265	*
segundo	0:ac1725ba162c	266	* @param netif network interface on which report IGMP memberships
segundo	0:ac1725ba162c	267	*/
segundo	0:ac1725ba162c	268	void
segundo	0:ac1725ba162c	269	igmp_report_groups(struct netif *netif)
segundo	0:ac1725ba162c	270	{
segundo	0:ac1725ba162c	271	struct igmp_group *group = igmp_group_list;
segundo	0:ac1725ba162c	272
segundo	0:ac1725ba162c	273	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
segundo	0:ac1725ba162c	274
segundo	0:ac1725ba162c	275	while (group != NULL) {
segundo	0:ac1725ba162c	276	if (group->netif == netif) {
segundo	0:ac1725ba162c	277	igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
segundo	0:ac1725ba162c	278	}
segundo	0:ac1725ba162c	279	group = group->next;
segundo	0:ac1725ba162c	280	}
segundo	0:ac1725ba162c	281	}
segundo	0:ac1725ba162c	282
segundo	0:ac1725ba162c	283	/**
segundo	0:ac1725ba162c	284	* Search for a group in the global igmp_group_list
segundo	0:ac1725ba162c	285	*
segundo	0:ac1725ba162c	286	* @param ifp the network interface for which to look
segundo	0:ac1725ba162c	287	* @param addr the group ip address to search for
segundo	0:ac1725ba162c	288	* @return a struct igmp_group* if the group has been found,
segundo	0:ac1725ba162c	289	* NULL if the group wasn't found.
segundo	0:ac1725ba162c	290	*/
segundo	0:ac1725ba162c	291	struct igmp_group *
segundo	0:ac1725ba162c	292	igmp_lookfor_group(struct netif ifp, ip_addr_t addr)
segundo	0:ac1725ba162c	293	{
segundo	0:ac1725ba162c	294	struct igmp_group *group = igmp_group_list;
segundo	0:ac1725ba162c	295
segundo	0:ac1725ba162c	296	while (group != NULL) {
segundo	0:ac1725ba162c	297	if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
segundo	0:ac1725ba162c	298	return group;
segundo	0:ac1725ba162c	299	}
segundo	0:ac1725ba162c	300	group = group->next;
segundo	0:ac1725ba162c	301	}
segundo	0:ac1725ba162c	302
segundo	0:ac1725ba162c	303	/* to be clearer, we return NULL here instead of
segundo	0:ac1725ba162c	304	* 'group' (which is also NULL at this point).
segundo	0:ac1725ba162c	305	*/
segundo	0:ac1725ba162c	306	return NULL;
segundo	0:ac1725ba162c	307	}
segundo	0:ac1725ba162c	308
segundo	0:ac1725ba162c	309	/**
segundo	0:ac1725ba162c	310	* Search for a specific igmp group and create a new one if not found-
segundo	0:ac1725ba162c	311	*
segundo	0:ac1725ba162c	312	* @param ifp the network interface for which to look
segundo	0:ac1725ba162c	313	* @param addr the group ip address to search
segundo	0:ac1725ba162c	314	* @return a struct igmp_group*,
segundo	0:ac1725ba162c	315	* NULL on memory error.
segundo	0:ac1725ba162c	316	*/
segundo	0:ac1725ba162c	317	struct igmp_group *
segundo	0:ac1725ba162c	318	igmp_lookup_group(struct netif ifp, ip_addr_t addr)
segundo	0:ac1725ba162c	319	{
segundo	0:ac1725ba162c	320	struct igmp_group *group = igmp_group_list;
segundo	0:ac1725ba162c	321
segundo	0:ac1725ba162c	322	/* Search if the group already exists */
segundo	0:ac1725ba162c	323	group = igmp_lookfor_group(ifp, addr);
segundo	0:ac1725ba162c	324	if (group != NULL) {
segundo	0:ac1725ba162c	325	/* Group already exists. */
segundo	0:ac1725ba162c	326	return group;
segundo	0:ac1725ba162c	327	}
segundo	0:ac1725ba162c	328
segundo	0:ac1725ba162c	329	/* Group doesn't exist yet, create a new one */
segundo	0:ac1725ba162c	330	group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
segundo	0:ac1725ba162c	331	if (group != NULL) {
segundo	0:ac1725ba162c	332	group->netif = ifp;
segundo	0:ac1725ba162c	333	ip_addr_set(&(group->group_address), addr);
segundo	0:ac1725ba162c	334	group->timer = 0; /* Not running */
segundo	0:ac1725ba162c	335	group->group_state = IGMP_GROUP_NON_MEMBER;
segundo	0:ac1725ba162c	336	group->last_reporter_flag = 0;
segundo	0:ac1725ba162c	337	group->use = 0;
segundo	0:ac1725ba162c	338	group->next = igmp_group_list;
segundo	0:ac1725ba162c	339
segundo	0:ac1725ba162c	340	igmp_group_list = group;
segundo	0:ac1725ba162c	341	}
segundo	0:ac1725ba162c	342
segundo	0:ac1725ba162c	343	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
segundo	0:ac1725ba162c	344	ip_addr_debug_print(IGMP_DEBUG, addr);
segundo	0:ac1725ba162c	345	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
segundo	0:ac1725ba162c	346
segundo	0:ac1725ba162c	347	return group;
segundo	0:ac1725ba162c	348	}
segundo	0:ac1725ba162c	349
segundo	0:ac1725ba162c	350	/**
segundo	0:ac1725ba162c	351	* Remove a group in the global igmp_group_list
segundo	0:ac1725ba162c	352	*
segundo	0:ac1725ba162c	353	* @param group the group to remove from the global igmp_group_list
segundo	0:ac1725ba162c	354	* @return ERR_OK if group was removed from the list, an err_t otherwise
segundo	0:ac1725ba162c	355	*/
segundo	0:ac1725ba162c	356	static err_t
segundo	0:ac1725ba162c	357	igmp_remove_group(struct igmp_group *group)
segundo	0:ac1725ba162c	358	{
segundo	0:ac1725ba162c	359	err_t err = ERR_OK;
segundo	0:ac1725ba162c	360
segundo	0:ac1725ba162c	361	/* Is it the first group? */
segundo	0:ac1725ba162c	362	if (igmp_group_list == group) {
segundo	0:ac1725ba162c	363	igmp_group_list = group->next;
segundo	0:ac1725ba162c	364	} else {
segundo	0:ac1725ba162c	365	/* look for group further down the list */
segundo	0:ac1725ba162c	366	struct igmp_group *tmpGroup;
segundo	0:ac1725ba162c	367	for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
segundo	0:ac1725ba162c	368	if (tmpGroup->next == group) {
segundo	0:ac1725ba162c	369	tmpGroup->next = group->next;
segundo	0:ac1725ba162c	370	break;
segundo	0:ac1725ba162c	371	}
segundo	0:ac1725ba162c	372	}
segundo	0:ac1725ba162c	373	/* Group not found in the global igmp_group_list */
segundo	0:ac1725ba162c	374	if (tmpGroup == NULL)
segundo	0:ac1725ba162c	375	err = ERR_ARG;
segundo	0:ac1725ba162c	376	}
segundo	0:ac1725ba162c	377	/* free group */
segundo	0:ac1725ba162c	378	memp_free(MEMP_IGMP_GROUP, group);
segundo	0:ac1725ba162c	379
segundo	0:ac1725ba162c	380	return err;
segundo	0:ac1725ba162c	381	}
segundo	0:ac1725ba162c	382
segundo	0:ac1725ba162c	383	/**
segundo	0:ac1725ba162c	384	* Called from ip_input() if a new IGMP packet is received.
segundo	0:ac1725ba162c	385	*
segundo	0:ac1725ba162c	386	* @param p received igmp packet, p->payload pointing to the ip header
segundo	0:ac1725ba162c	387	* @param inp network interface on which the packet was received
segundo	0:ac1725ba162c	388	* @param dest destination ip address of the igmp packet
segundo	0:ac1725ba162c	389	*/
segundo	0:ac1725ba162c	390	void
segundo	0:ac1725ba162c	391	igmp_input(struct pbuf p, struct netif inp, ip_addr_t *dest)
segundo	0:ac1725ba162c	392	{
segundo	0:ac1725ba162c	393	struct ip_hdr * iphdr;
segundo	0:ac1725ba162c	394	struct igmp_msg* igmp;
segundo	0:ac1725ba162c	395	struct igmp_group* group;
segundo	0:ac1725ba162c	396	struct igmp_group* groupref;
segundo	0:ac1725ba162c	397
segundo	0:ac1725ba162c	398	IGMP_STATS_INC(igmp.recv);
segundo	0:ac1725ba162c	399
segundo	0:ac1725ba162c	400	/* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
segundo	0:ac1725ba162c	401	iphdr = (struct ip_hdr *)p->payload;
segundo	0:ac1725ba162c	402	if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) \|\| (p->len < IGMP_MINLEN)) {
segundo	0:ac1725ba162c	403	pbuf_free(p);
segundo	0:ac1725ba162c	404	IGMP_STATS_INC(igmp.lenerr);
segundo	0:ac1725ba162c	405	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
segundo	0:ac1725ba162c	406	return;
segundo	0:ac1725ba162c	407	}
segundo	0:ac1725ba162c	408
segundo	0:ac1725ba162c	409	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
segundo	0:ac1725ba162c	410	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
segundo	0:ac1725ba162c	411	LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
segundo	0:ac1725ba162c	412	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
segundo	0:ac1725ba162c	413	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
segundo	0:ac1725ba162c	414
segundo	0:ac1725ba162c	415	/* Now calculate and check the checksum */
segundo	0:ac1725ba162c	416	igmp = (struct igmp_msg *)p->payload;
segundo	0:ac1725ba162c	417	if (inet_chksum(igmp, p->len)) {
segundo	0:ac1725ba162c	418	pbuf_free(p);
segundo	0:ac1725ba162c	419	IGMP_STATS_INC(igmp.chkerr);
segundo	0:ac1725ba162c	420	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
segundo	0:ac1725ba162c	421	return;
segundo	0:ac1725ba162c	422	}
segundo	0:ac1725ba162c	423
segundo	0:ac1725ba162c	424	/* Packet is ok so find an existing group */
segundo	0:ac1725ba162c	425	group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
segundo	0:ac1725ba162c	426
segundo	0:ac1725ba162c	427	/* If group can be found or create... */
segundo	0:ac1725ba162c	428	if (!group) {
segundo	0:ac1725ba162c	429	pbuf_free(p);
segundo	0:ac1725ba162c	430	IGMP_STATS_INC(igmp.drop);
segundo	0:ac1725ba162c	431	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
segundo	0:ac1725ba162c	432	return;
segundo	0:ac1725ba162c	433	}
segundo	0:ac1725ba162c	434
segundo	0:ac1725ba162c	435	/* NOW ACT ON THE INCOMING MESSAGE TYPE... */
segundo	0:ac1725ba162c	436	switch (igmp->igmp_msgtype) {
segundo	0:ac1725ba162c	437	case IGMP_MEMB_QUERY: {
segundo	0:ac1725ba162c	438	/* IGMP_MEMB_QUERY to the "all systems" address ? */
segundo	0:ac1725ba162c	439	if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
segundo	0:ac1725ba162c	440	/* THIS IS THE GENERAL QUERY */
segundo	0:ac1725ba162c	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)));
segundo	0:ac1725ba162c	442
segundo	0:ac1725ba162c	443	if (igmp->igmp_maxresp == 0) {
segundo	0:ac1725ba162c	444	IGMP_STATS_INC(igmp.rx_v1);
segundo	0:ac1725ba162c	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"));
segundo	0:ac1725ba162c	446	igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
segundo	0:ac1725ba162c	447	} else {
segundo	0:ac1725ba162c	448	IGMP_STATS_INC(igmp.rx_general);
segundo	0:ac1725ba162c	449	}
segundo	0:ac1725ba162c	450
segundo	0:ac1725ba162c	451	groupref = igmp_group_list;
segundo	0:ac1725ba162c	452	while (groupref) {
segundo	0:ac1725ba162c	453	/* Do not send messages on the all systems group address! */
segundo	0:ac1725ba162c	454	if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
segundo	0:ac1725ba162c	455	igmp_delaying_member(groupref, igmp->igmp_maxresp);
segundo	0:ac1725ba162c	456	}
segundo	0:ac1725ba162c	457	groupref = groupref->next;
segundo	0:ac1725ba162c	458	}
segundo	0:ac1725ba162c	459	} else {
segundo	0:ac1725ba162c	460	/* IGMP_MEMB_QUERY to a specific group ? */
segundo	0:ac1725ba162c	461	if (!ip_addr_isany(&igmp->igmp_group_address)) {
segundo	0:ac1725ba162c	462	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
segundo	0:ac1725ba162c	463	ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
segundo	0:ac1725ba162c	464	if (ip_addr_cmp(dest, &allsystems)) {
segundo	0:ac1725ba162c	465	ip_addr_t groupaddr;
segundo	0:ac1725ba162c	466	LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
segundo	0:ac1725ba162c	467	/* we first need to re-look for the group since we used dest last time */
segundo	0:ac1725ba162c	468	ip_addr_copy(groupaddr, igmp->igmp_group_address);
segundo	0:ac1725ba162c	469	group = igmp_lookfor_group(inp, &groupaddr);
segundo	0:ac1725ba162c	470	} else {
segundo	0:ac1725ba162c	471	LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
segundo	0:ac1725ba162c	472	}
segundo	0:ac1725ba162c	473
segundo	0:ac1725ba162c	474	if (group != NULL) {
segundo	0:ac1725ba162c	475	IGMP_STATS_INC(igmp.rx_group);
segundo	0:ac1725ba162c	476	igmp_delaying_member(group, igmp->igmp_maxresp);
segundo	0:ac1725ba162c	477	} else {
segundo	0:ac1725ba162c	478	IGMP_STATS_INC(igmp.drop);
segundo	0:ac1725ba162c	479	}
segundo	0:ac1725ba162c	480	} else {
segundo	0:ac1725ba162c	481	IGMP_STATS_INC(igmp.proterr);
segundo	0:ac1725ba162c	482	}
segundo	0:ac1725ba162c	483	}
segundo	0:ac1725ba162c	484	break;
segundo	0:ac1725ba162c	485	}
segundo	0:ac1725ba162c	486	case IGMP_V2_MEMB_REPORT: {
segundo	0:ac1725ba162c	487	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
segundo	0:ac1725ba162c	488	IGMP_STATS_INC(igmp.rx_report);
segundo	0:ac1725ba162c	489	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
segundo	0:ac1725ba162c	490	/* This is on a specific group we have already looked up */
segundo	0:ac1725ba162c	491	group->timer = 0; /* stopped */
segundo	0:ac1725ba162c	492	group->group_state = IGMP_GROUP_IDLE_MEMBER;
segundo	0:ac1725ba162c	493	group->last_reporter_flag = 0;
segundo	0:ac1725ba162c	494	}
segundo	0:ac1725ba162c	495	break;
segundo	0:ac1725ba162c	496	}
segundo	0:ac1725ba162c	497	default: {
segundo	0:ac1725ba162c	498	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
segundo	0:ac1725ba162c	499	igmp->igmp_msgtype, group->group_state, &group, group->netif));
segundo	0:ac1725ba162c	500	IGMP_STATS_INC(igmp.proterr);
segundo	0:ac1725ba162c	501	break;
segundo	0:ac1725ba162c	502	}
segundo	0:ac1725ba162c	503	}
segundo	0:ac1725ba162c	504
segundo	0:ac1725ba162c	505	pbuf_free(p);
segundo	0:ac1725ba162c	506	return;
segundo	0:ac1725ba162c	507	}
segundo	0:ac1725ba162c	508
segundo	0:ac1725ba162c	509	/**
segundo	0:ac1725ba162c	510	* Join a group on one network interface.
segundo	0:ac1725ba162c	511	*
segundo	0:ac1725ba162c	512	* @param ifaddr ip address of the network interface which should join a new group
segundo	0:ac1725ba162c	513	* @param groupaddr the ip address of the group which to join
segundo	0:ac1725ba162c	514	* @return ERR_OK if group was joined on the netif(s), an err_t otherwise
segundo	0:ac1725ba162c	515	*/
segundo	0:ac1725ba162c	516	err_t
segundo	0:ac1725ba162c	517	igmp_joingroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
segundo	0:ac1725ba162c	518	{
segundo	0:ac1725ba162c	519	err_t err = ERR_VAL; /* no matching interface */
segundo	0:ac1725ba162c	520	struct igmp_group *group;
segundo	0:ac1725ba162c	521	struct netif *netif;
segundo	0:ac1725ba162c	522
segundo	0:ac1725ba162c	523	/* make sure it is multicast address */
segundo	0:ac1725ba162c	524	LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
segundo	0:ac1725ba162c	525	LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
segundo	0:ac1725ba162c	526
segundo	0:ac1725ba162c	527	/* loop through netif's */
segundo	0:ac1725ba162c	528	netif = netif_list;
segundo	0:ac1725ba162c	529	while (netif != NULL) {
segundo	0:ac1725ba162c	530	/* Should we join this interface ? */
segundo	0:ac1725ba162c	531	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
segundo	0:ac1725ba162c	532	/* find group or create a new one if not found */
segundo	0:ac1725ba162c	533	group = igmp_lookup_group(netif, groupaddr);
segundo	0:ac1725ba162c	534
segundo	0:ac1725ba162c	535	if (group != NULL) {
segundo	0:ac1725ba162c	536	/* This should create a new group, check the state to make sure */
segundo	0:ac1725ba162c	537	if (group->group_state != IGMP_GROUP_NON_MEMBER) {
segundo	0:ac1725ba162c	538	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
segundo	0:ac1725ba162c	539	} else {
segundo	0:ac1725ba162c	540	/* OK - it was new group */
segundo	0:ac1725ba162c	541	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
segundo	0:ac1725ba162c	542	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
segundo	0:ac1725ba162c	543	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
segundo	0:ac1725ba162c	544
segundo	0:ac1725ba162c	545	/* If first use of the group, allow the group at the MAC level */
segundo	0:ac1725ba162c	546	if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
segundo	0:ac1725ba162c	547	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
segundo	0:ac1725ba162c	548	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
segundo	0:ac1725ba162c	549	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
segundo	0:ac1725ba162c	550	netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
segundo	0:ac1725ba162c	551	}
segundo	0:ac1725ba162c	552
segundo	0:ac1725ba162c	553	IGMP_STATS_INC(igmp.tx_join);
segundo	0:ac1725ba162c	554	igmp_send(group, IGMP_V2_MEMB_REPORT);
segundo	0:ac1725ba162c	555
segundo	0:ac1725ba162c	556	igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
segundo	0:ac1725ba162c	557
segundo	0:ac1725ba162c	558	/* Need to work out where this timer comes from */
segundo	0:ac1725ba162c	559	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
segundo	0:ac1725ba162c	560	}
segundo	0:ac1725ba162c	561	/* Increment group use */
segundo	0:ac1725ba162c	562	group->use++;
segundo	0:ac1725ba162c	563	/* Join on this interface */
segundo	0:ac1725ba162c	564	err = ERR_OK;
segundo	0:ac1725ba162c	565	} else {
segundo	0:ac1725ba162c	566	/* Return an error even if some network interfaces are joined */
segundo	0:ac1725ba162c	567	/** @todo undo any other netif already joined */
segundo	0:ac1725ba162c	568	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
segundo	0:ac1725ba162c	569	return ERR_MEM;
segundo	0:ac1725ba162c	570	}
segundo	0:ac1725ba162c	571	}
segundo	0:ac1725ba162c	572	/* proceed to next network interface */
segundo	0:ac1725ba162c	573	netif = netif->next;
segundo	0:ac1725ba162c	574	}
segundo	0:ac1725ba162c	575
segundo	0:ac1725ba162c	576	return err;
segundo	0:ac1725ba162c	577	}
segundo	0:ac1725ba162c	578
segundo	0:ac1725ba162c	579	/**
segundo	0:ac1725ba162c	580	* Leave a group on one network interface.
segundo	0:ac1725ba162c	581	*
segundo	0:ac1725ba162c	582	* @param ifaddr ip address of the network interface which should leave a group
segundo	0:ac1725ba162c	583	* @param groupaddr the ip address of the group which to leave
segundo	0:ac1725ba162c	584	* @return ERR_OK if group was left on the netif(s), an err_t otherwise
segundo	0:ac1725ba162c	585	*/
segundo	0:ac1725ba162c	586	err_t
segundo	0:ac1725ba162c	587	igmp_leavegroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
segundo	0:ac1725ba162c	588	{
segundo	0:ac1725ba162c	589	err_t err = ERR_VAL; /* no matching interface */
segundo	0:ac1725ba162c	590	struct igmp_group *group;
segundo	0:ac1725ba162c	591	struct netif *netif;
segundo	0:ac1725ba162c	592
segundo	0:ac1725ba162c	593	/* make sure it is multicast address */
segundo	0:ac1725ba162c	594	LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
segundo	0:ac1725ba162c	595	LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
segundo	0:ac1725ba162c	596
segundo	0:ac1725ba162c	597	/* loop through netif's */
segundo	0:ac1725ba162c	598	netif = netif_list;
segundo	0:ac1725ba162c	599	while (netif != NULL) {
segundo	0:ac1725ba162c	600	/* Should we leave this interface ? */
segundo	0:ac1725ba162c	601	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
segundo	0:ac1725ba162c	602	/* find group */
segundo	0:ac1725ba162c	603	group = igmp_lookfor_group(netif, groupaddr);
segundo	0:ac1725ba162c	604
segundo	0:ac1725ba162c	605	if (group != NULL) {
segundo	0:ac1725ba162c	606	/* Only send a leave if the flag is set according to the state diagram */
segundo	0:ac1725ba162c	607	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
segundo	0:ac1725ba162c	608	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
segundo	0:ac1725ba162c	609	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
segundo	0:ac1725ba162c	610
segundo	0:ac1725ba162c	611	/* If there is no other use of the group */
segundo	0:ac1725ba162c	612	if (group->use <= 1) {
segundo	0:ac1725ba162c	613	/* If we are the last reporter for this group */
segundo	0:ac1725ba162c	614	if (group->last_reporter_flag) {
segundo	0:ac1725ba162c	615	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
segundo	0:ac1725ba162c	616	IGMP_STATS_INC(igmp.tx_leave);
segundo	0:ac1725ba162c	617	igmp_send(group, IGMP_LEAVE_GROUP);
segundo	0:ac1725ba162c	618	}
segundo	0:ac1725ba162c	619
segundo	0:ac1725ba162c	620	/* Disable the group at the MAC level */
segundo	0:ac1725ba162c	621	if (netif->igmp_mac_filter != NULL) {
segundo	0:ac1725ba162c	622	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
segundo	0:ac1725ba162c	623	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
segundo	0:ac1725ba162c	624	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
segundo	0:ac1725ba162c	625	netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
segundo	0:ac1725ba162c	626	}
segundo	0:ac1725ba162c	627
segundo	0:ac1725ba162c	628	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
segundo	0:ac1725ba162c	629	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
segundo	0:ac1725ba162c	630	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
segundo	0:ac1725ba162c	631
segundo	0:ac1725ba162c	632	/* Free the group */
segundo	0:ac1725ba162c	633	igmp_remove_group(group);
segundo	0:ac1725ba162c	634	} else {
segundo	0:ac1725ba162c	635	/* Decrement group use */
segundo	0:ac1725ba162c	636	group->use--;
segundo	0:ac1725ba162c	637	}
segundo	0:ac1725ba162c	638	/* Leave on this interface */
segundo	0:ac1725ba162c	639	err = ERR_OK;
segundo	0:ac1725ba162c	640	} else {
segundo	0:ac1725ba162c	641	/* It's not a fatal error on "leavegroup" */
segundo	0:ac1725ba162c	642	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
segundo	0:ac1725ba162c	643	}
segundo	0:ac1725ba162c	644	}
segundo	0:ac1725ba162c	645	/* proceed to next network interface */
segundo	0:ac1725ba162c	646	netif = netif->next;
segundo	0:ac1725ba162c	647	}
segundo	0:ac1725ba162c	648
segundo	0:ac1725ba162c	649	return err;
segundo	0:ac1725ba162c	650	}
segundo	0:ac1725ba162c	651
segundo	0:ac1725ba162c	652	/**
segundo	0:ac1725ba162c	653	* The igmp timer function (both for NO_SYS=1 and =0)
segundo	0:ac1725ba162c	654	* Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
segundo	0:ac1725ba162c	655	*/
segundo	0:ac1725ba162c	656	void
segundo	0:ac1725ba162c	657	igmp_tmr(void)
segundo	0:ac1725ba162c	658	{
segundo	0:ac1725ba162c	659	struct igmp_group *group = igmp_group_list;
segundo	0:ac1725ba162c	660
segundo	0:ac1725ba162c	661	while (group != NULL) {
segundo	0:ac1725ba162c	662	if (group->timer > 0) {
segundo	0:ac1725ba162c	663	group->timer--;
segundo	0:ac1725ba162c	664	if (group->timer == 0) {
segundo	0:ac1725ba162c	665	igmp_timeout(group);
segundo	0:ac1725ba162c	666	}
segundo	0:ac1725ba162c	667	}
segundo	0:ac1725ba162c	668	group = group->next;
segundo	0:ac1725ba162c	669	}
segundo	0:ac1725ba162c	670	}
segundo	0:ac1725ba162c	671
segundo	0:ac1725ba162c	672	/**
segundo	0:ac1725ba162c	673	* Called if a timeout for one group is reached.
segundo	0:ac1725ba162c	674	* Sends a report for this group.
segundo	0:ac1725ba162c	675	*
segundo	0:ac1725ba162c	676	* @param group an igmp_group for which a timeout is reached
segundo	0:ac1725ba162c	677	*/
segundo	0:ac1725ba162c	678	static void
segundo	0:ac1725ba162c	679	igmp_timeout(struct igmp_group *group)
segundo	0:ac1725ba162c	680	{
segundo	0:ac1725ba162c	681	/* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
segundo	0:ac1725ba162c	682	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
segundo	0:ac1725ba162c	683	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
segundo	0:ac1725ba162c	684	ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
segundo	0:ac1725ba162c	685	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
segundo	0:ac1725ba162c	686
segundo	0:ac1725ba162c	687	IGMP_STATS_INC(igmp.tx_report);
segundo	0:ac1725ba162c	688	igmp_send(group, IGMP_V2_MEMB_REPORT);
segundo	0:ac1725ba162c	689	}
segundo	0:ac1725ba162c	690	}
segundo	0:ac1725ba162c	691
segundo	0:ac1725ba162c	692	/**
segundo	0:ac1725ba162c	693	* Start a timer for an igmp group
segundo	0:ac1725ba162c	694	*
segundo	0:ac1725ba162c	695	* @param group the igmp_group for which to start a timer
segundo	0:ac1725ba162c	696	* @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
segundo	0:ac1725ba162c	697	* every call to igmp_tmr())
segundo	0:ac1725ba162c	698	*/
segundo	0:ac1725ba162c	699	static void
segundo	0:ac1725ba162c	700	igmp_start_timer(struct igmp_group *group, u8_t max_time)
segundo	0:ac1725ba162c	701	{
segundo	0:ac1725ba162c	702	/* ensure the input value is > 0 */
segundo	0:ac1725ba162c	703	if (max_time == 0) {
segundo	0:ac1725ba162c	704	max_time = 1;
segundo	0:ac1725ba162c	705	}
segundo	0:ac1725ba162c	706	/* ensure the random value is > 0 */
segundo	0:ac1725ba162c	707	group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
segundo	0:ac1725ba162c	708	}
segundo	0:ac1725ba162c	709
segundo	0:ac1725ba162c	710	/**
segundo	0:ac1725ba162c	711	* Stop a timer for an igmp_group
segundo	0:ac1725ba162c	712	*
segundo	0:ac1725ba162c	713	* @param group the igmp_group for which to stop the timer
segundo	0:ac1725ba162c	714	*/
segundo	0:ac1725ba162c	715	static void
segundo	0:ac1725ba162c	716	igmp_stop_timer(struct igmp_group *group)
segundo	0:ac1725ba162c	717	{
segundo	0:ac1725ba162c	718	group->timer = 0;
segundo	0:ac1725ba162c	719	}
segundo	0:ac1725ba162c	720
segundo	0:ac1725ba162c	721	/**
segundo	0:ac1725ba162c	722	* Delaying membership report for a group if necessary
segundo	0:ac1725ba162c	723	*
segundo	0:ac1725ba162c	724	* @param group the igmp_group for which "delaying" membership report
segundo	0:ac1725ba162c	725	* @param maxresp query delay
segundo	0:ac1725ba162c	726	*/
segundo	0:ac1725ba162c	727	static void
segundo	0:ac1725ba162c	728	igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
segundo	0:ac1725ba162c	729	{
segundo	0:ac1725ba162c	730	if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) \|\|
segundo	0:ac1725ba162c	731	((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
segundo	0:ac1725ba162c	732	((group->timer == 0) \|\| (maxresp < group->timer)))) {
segundo	0:ac1725ba162c	733	igmp_start_timer(group, maxresp);
segundo	0:ac1725ba162c	734	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
segundo	0:ac1725ba162c	735	}
segundo	0:ac1725ba162c	736	}
segundo	0:ac1725ba162c	737
segundo	0:ac1725ba162c	738
segundo	0:ac1725ba162c	739	/**
segundo	0:ac1725ba162c	740	* Sends an IP packet on a network interface. This function constructs the IP header
segundo	0:ac1725ba162c	741	* and calculates the IP header checksum. If the source IP address is NULL,
segundo	0:ac1725ba162c	742	* the IP address of the outgoing network interface is filled in as source address.
segundo	0:ac1725ba162c	743	*
segundo	0:ac1725ba162c	744	* @param p the packet to send (p->payload points to the data, e.g. next
segundo	0:ac1725ba162c	745	protocol header; if dest == IP_HDRINCL, p already includes an IP
segundo	0:ac1725ba162c	746	header and p->payload points to that IP header)
segundo	0:ac1725ba162c	747	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
segundo	0:ac1725ba162c	748	* IP address of the netif used to send is used as source address)
segundo	0:ac1725ba162c	749	* @param dest the destination IP address to send the packet to
segundo	0:ac1725ba162c	750	* @param ttl the TTL value to be set in the IP header
segundo	0:ac1725ba162c	751	* @param proto the PROTOCOL to be set in the IP header
segundo	0:ac1725ba162c	752	* @param netif the netif on which to send this packet
segundo	0:ac1725ba162c	753	* @return ERR_OK if the packet was sent OK
segundo	0:ac1725ba162c	754	* ERR_BUF if p doesn't have enough space for IP/LINK headers
segundo	0:ac1725ba162c	755	* returns errors returned by netif->output
segundo	0:ac1725ba162c	756	*/
segundo	0:ac1725ba162c	757	static err_t
segundo	0:ac1725ba162c	758	igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif)
segundo	0:ac1725ba162c	759	{
segundo	0:ac1725ba162c	760	/* This is the "router alert" option */
segundo	0:ac1725ba162c	761	u16_t ra[2];
segundo	0:ac1725ba162c	762	ra[0] = PP_HTONS(ROUTER_ALERT);
segundo	0:ac1725ba162c	763	ra[1] = 0x0000; /* Router shall examine packet */
segundo	0:ac1725ba162c	764	IGMP_STATS_INC(igmp.xmit);
segundo	0:ac1725ba162c	765	return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
segundo	0:ac1725ba162c	766	}
segundo	0:ac1725ba162c	767
segundo	0:ac1725ba162c	768	/**
segundo	0:ac1725ba162c	769	* Send an igmp packet to a specific group.
segundo	0:ac1725ba162c	770	*
segundo	0:ac1725ba162c	771	* @param group the group to which to send the packet
segundo	0:ac1725ba162c	772	* @param type the type of igmp packet to send
segundo	0:ac1725ba162c	773	*/
segundo	0:ac1725ba162c	774	static void
segundo	0:ac1725ba162c	775	igmp_send(struct igmp_group *group, u8_t type)
segundo	0:ac1725ba162c	776	{
segundo	0:ac1725ba162c	777	struct pbuf* p = NULL;
segundo	0:ac1725ba162c	778	struct igmp_msg* igmp = NULL;
segundo	0:ac1725ba162c	779	ip_addr_t src = *IP_ADDR_ANY;
segundo	0:ac1725ba162c	780	ip_addr_t* dest = NULL;
segundo	0:ac1725ba162c	781
segundo	0:ac1725ba162c	782	/* IP header + "router alert" option + IGMP header */
segundo	0:ac1725ba162c	783	p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
segundo	0:ac1725ba162c	784
segundo	0:ac1725ba162c	785	if (p) {
segundo	0:ac1725ba162c	786	igmp = (struct igmp_msg *)p->payload;
segundo	0:ac1725ba162c	787	LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
segundo	0:ac1725ba162c	788	(p->len >= sizeof(struct igmp_msg)));
segundo	0:ac1725ba162c	789	ip_addr_copy(src, group->netif->ip_addr);
segundo	0:ac1725ba162c	790
segundo	0:ac1725ba162c	791	if (type == IGMP_V2_MEMB_REPORT) {
segundo	0:ac1725ba162c	792	dest = &(group->group_address);
segundo	0:ac1725ba162c	793	ip_addr_copy(igmp->igmp_group_address, group->group_address);
segundo	0:ac1725ba162c	794	group->last_reporter_flag = 1; /* Remember we were the last to report */
segundo	0:ac1725ba162c	795	} else {
segundo	0:ac1725ba162c	796	if (type == IGMP_LEAVE_GROUP) {
segundo	0:ac1725ba162c	797	dest = &allrouters;
segundo	0:ac1725ba162c	798	ip_addr_copy(igmp->igmp_group_address, group->group_address);
segundo	0:ac1725ba162c	799	}
segundo	0:ac1725ba162c	800	}
segundo	0:ac1725ba162c	801
segundo	0:ac1725ba162c	802	if ((type == IGMP_V2_MEMB_REPORT) \|\| (type == IGMP_LEAVE_GROUP)) {
segundo	0:ac1725ba162c	803	igmp->igmp_msgtype = type;
segundo	0:ac1725ba162c	804	igmp->igmp_maxresp = 0;
segundo	0:ac1725ba162c	805	igmp->igmp_checksum = 0;
segundo	0:ac1725ba162c	806	igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
segundo	0:ac1725ba162c	807
segundo	0:ac1725ba162c	808	igmp_ip_output_if(p, &src, dest, group->netif);
segundo	0:ac1725ba162c	809	}
segundo	0:ac1725ba162c	810
segundo	0:ac1725ba162c	811	pbuf_free(p);
segundo	0:ac1725ba162c	812	} else {
segundo	0:ac1725ba162c	813	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
segundo	0:ac1725ba162c	814	IGMP_STATS_INC(igmp.memerr);
segundo	0:ac1725ba162c	815	}
segundo	0:ac1725ba162c	816	}
segundo	0:ac1725ba162c	817
segundo	0:ac1725ba162c	818	#endif /* LWIP_IGMP */

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Type:	Library
Created:	09 Nov 2010
Imports:	3034
Forks:	1
Commits:	8
Dependents:	42
Dependencies:	0
Followers:	27

lwip/core/ipv4/igmp.c@0:ac1725ba162c, 2010-11-09 (annotated)

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