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NetTribute library with debug turned on in FShandler Donatien Garner -> Segundo Equipo -> this version

lwip/core/ipv4/igmp.c@0:281d6ff68967, 2010-11-19 (annotated)

Committer:: hexley
Date:: Fri Nov 19 01:54:45 2010 +0000
Revision:: 0:281d6ff68967

Who changed what in which revision?

User	Revision	Line number	New contents of line
hexley	0:281d6ff68967	1	#pragma diag_remark 177
hexley	0:281d6ff68967	2	/**
hexley	0:281d6ff68967	3	* @file
hexley	0:281d6ff68967	4	* IGMP - Internet Group Management Protocol
hexley	0:281d6ff68967	5	*
hexley	0:281d6ff68967	6	*/
hexley	0:281d6ff68967	7
hexley	0:281d6ff68967	8	/*
hexley	0:281d6ff68967	9	* Copyright (c) 2002 CITEL Technologies Ltd.
hexley	0:281d6ff68967	10	* All rights reserved.
hexley	0:281d6ff68967	11	*
hexley	0:281d6ff68967	12	* Redistribution and use in source and binary forms, with or without
hexley	0:281d6ff68967	13	* modification, are permitted provided that the following conditions
hexley	0:281d6ff68967	14	* are met:
hexley	0:281d6ff68967	15	* 1. Redistributions of source code must retain the above copyright
hexley	0:281d6ff68967	16	* notice, this list of conditions and the following disclaimer.
hexley	0:281d6ff68967	17	* 2. Redistributions in binary form must reproduce the above copyright
hexley	0:281d6ff68967	18	* notice, this list of conditions and the following disclaimer in the
hexley	0:281d6ff68967	19	* documentation and/or other materials provided with the distribution.
hexley	0:281d6ff68967	20	* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
hexley	0:281d6ff68967	21	* may be used to endorse or promote products derived from this software
hexley	0:281d6ff68967	22	* without specific prior written permission.
hexley	0:281d6ff68967	23	*
hexley	0:281d6ff68967	24	* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
hexley	0:281d6ff68967	25	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
hexley	0:281d6ff68967	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
hexley	0:281d6ff68967	27	* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
hexley	0:281d6ff68967	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
hexley	0:281d6ff68967	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
hexley	0:281d6ff68967	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
hexley	0:281d6ff68967	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
hexley	0:281d6ff68967	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
hexley	0:281d6ff68967	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
hexley	0:281d6ff68967	34	* SUCH DAMAGE.
hexley	0:281d6ff68967	35	*
hexley	0:281d6ff68967	36	* This file is a contribution to the lwIP TCP/IP stack.
hexley	0:281d6ff68967	37	* The Swedish Institute of Computer Science and Adam Dunkels
hexley	0:281d6ff68967	38	* are specifically granted permission to redistribute this
hexley	0:281d6ff68967	39	* source code.
hexley	0:281d6ff68967	40	*/
hexley	0:281d6ff68967	41
hexley	0:281d6ff68967	42	/*-------------------------------------------------------------
hexley	0:281d6ff68967	43	Note 1)
hexley	0:281d6ff68967	44	Although the rfc requires V1 AND V2 capability
hexley	0:281d6ff68967	45	we will only support v2 since now V1 is very old (August 1989)
hexley	0:281d6ff68967	46	V1 can be added if required
hexley	0:281d6ff68967	47
hexley	0:281d6ff68967	48	a debug print and statistic have been implemented to
hexley	0:281d6ff68967	49	show this up.
hexley	0:281d6ff68967	50	-------------------------------------------------------------
hexley	0:281d6ff68967	51	-------------------------------------------------------------
hexley	0:281d6ff68967	52	Note 2)
hexley	0:281d6ff68967	53	A query for a specific group address (as opposed to ALLHOSTS)
hexley	0:281d6ff68967	54	has now been implemented as I am unsure if it is required
hexley	0:281d6ff68967	55
hexley	0:281d6ff68967	56	a debug print and statistic have been implemented to
hexley	0:281d6ff68967	57	show this up.
hexley	0:281d6ff68967	58	-------------------------------------------------------------
hexley	0:281d6ff68967	59	-------------------------------------------------------------
hexley	0:281d6ff68967	60	Note 3)
hexley	0:281d6ff68967	61	The router alert rfc 2113 is implemented in outgoing packets
hexley	0:281d6ff68967	62	but not checked rigorously incoming
hexley	0:281d6ff68967	63	-------------------------------------------------------------
hexley	0:281d6ff68967	64	Steve Reynolds
hexley	0:281d6ff68967	65	------------------------------------------------------------*/
hexley	0:281d6ff68967	66
hexley	0:281d6ff68967	67	/*-----------------------------------------------------------------------------
hexley	0:281d6ff68967	68	* RFC 988 - Host extensions for IP multicasting - V0
hexley	0:281d6ff68967	69	* RFC 1054 - Host extensions for IP multicasting -
hexley	0:281d6ff68967	70	* RFC 1112 - Host extensions for IP multicasting - V1
hexley	0:281d6ff68967	71	* RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
hexley	0:281d6ff68967	72	* RFC 3376 - Internet Group Management Protocol, Version 3 - V3
hexley	0:281d6ff68967	73	* RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
hexley	0:281d6ff68967	74	* RFC 2113 - IP Router Alert Option -
hexley	0:281d6ff68967	75	----------------------------------------------------------------------------/
hexley	0:281d6ff68967	76
hexley	0:281d6ff68967	77	/*-----------------------------------------------------------------------------
hexley	0:281d6ff68967	78	* Includes
hexley	0:281d6ff68967	79	----------------------------------------------------------------------------/
hexley	0:281d6ff68967	80
hexley	0:281d6ff68967	81	#include "lwip/opt.h"
hexley	0:281d6ff68967	82
hexley	0:281d6ff68967	83	#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
hexley	0:281d6ff68967	84
hexley	0:281d6ff68967	85	#include "lwip/igmp.h"
hexley	0:281d6ff68967	86	#include "lwip/debug.h"
hexley	0:281d6ff68967	87	#include "lwip/def.h"
hexley	0:281d6ff68967	88	#include "lwip/mem.h"
hexley	0:281d6ff68967	89	#include "lwip/ip.h"
hexley	0:281d6ff68967	90	#include "lwip/inet_chksum.h"
hexley	0:281d6ff68967	91	#include "lwip/netif.h"
hexley	0:281d6ff68967	92	#include "lwip/icmp.h"
hexley	0:281d6ff68967	93	#include "lwip/udp.h"
hexley	0:281d6ff68967	94	#include "lwip/tcp.h"
hexley	0:281d6ff68967	95	#include "lwip/stats.h"
hexley	0:281d6ff68967	96
hexley	0:281d6ff68967	97	#include "string.h"
hexley	0:281d6ff68967	98
hexley	0:281d6ff68967	99	/*
hexley	0:281d6ff68967	100	* IGMP constants
hexley	0:281d6ff68967	101	*/
hexley	0:281d6ff68967	102	#define IGMP_TTL 1
hexley	0:281d6ff68967	103	#define IGMP_MINLEN 8
hexley	0:281d6ff68967	104	#define ROUTER_ALERT 0x9404
hexley	0:281d6ff68967	105	#define ROUTER_ALERTLEN 4
hexley	0:281d6ff68967	106
hexley	0:281d6ff68967	107	/*
hexley	0:281d6ff68967	108	* IGMP message types, including version number.
hexley	0:281d6ff68967	109	*/
hexley	0:281d6ff68967	110	#define IGMP_MEMB_QUERY 0x11 /* Membership query */
hexley	0:281d6ff68967	111	#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
hexley	0:281d6ff68967	112	#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
hexley	0:281d6ff68967	113	#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
hexley	0:281d6ff68967	114
hexley	0:281d6ff68967	115	/* Group membership states */
hexley	0:281d6ff68967	116	#define IGMP_GROUP_NON_MEMBER 0
hexley	0:281d6ff68967	117	#define IGMP_GROUP_DELAYING_MEMBER 1
hexley	0:281d6ff68967	118	#define IGMP_GROUP_IDLE_MEMBER 2
hexley	0:281d6ff68967	119
hexley	0:281d6ff68967	120	/**
hexley	0:281d6ff68967	121	* IGMP packet format.
hexley	0:281d6ff68967	122	*/
hexley	0:281d6ff68967	123	#ifdef PACK_STRUCT_USE_INCLUDES
hexley	0:281d6ff68967	124	# include "arch/bpstruct.h"
hexley	0:281d6ff68967	125	#endif
hexley	0:281d6ff68967	126	PACK_STRUCT_BEGIN
hexley	0:281d6ff68967	127	struct igmp_msg {
hexley	0:281d6ff68967	128	PACK_STRUCT_FIELD(u8_t igmp_msgtype);
hexley	0:281d6ff68967	129	PACK_STRUCT_FIELD(u8_t igmp_maxresp);
hexley	0:281d6ff68967	130	PACK_STRUCT_FIELD(u16_t igmp_checksum);
hexley	0:281d6ff68967	131	PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
hexley	0:281d6ff68967	132	} PACK_STRUCT_STRUCT;
hexley	0:281d6ff68967	133	PACK_STRUCT_END
hexley	0:281d6ff68967	134	#ifdef PACK_STRUCT_USE_INCLUDES
hexley	0:281d6ff68967	135	# include "arch/epstruct.h"
hexley	0:281d6ff68967	136	#endif
hexley	0:281d6ff68967	137
hexley	0:281d6ff68967	138
hexley	0:281d6ff68967	139	static struct igmp_group igmp_lookup_group(struct netif ifp, ip_addr_t *addr);
hexley	0:281d6ff68967	140	static err_t igmp_remove_group(struct igmp_group *group);
hexley	0:281d6ff68967	141	static void igmp_timeout( struct igmp_group *group);
hexley	0:281d6ff68967	142	static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
hexley	0:281d6ff68967	143	static void igmp_stop_timer(struct igmp_group *group);
hexley	0:281d6ff68967	144	static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
hexley	0:281d6ff68967	145	static err_t igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif);
hexley	0:281d6ff68967	146	static void igmp_send(struct igmp_group *group, u8_t type);
hexley	0:281d6ff68967	147
hexley	0:281d6ff68967	148
hexley	0:281d6ff68967	149	static struct igmp_group* igmp_group_list;
hexley	0:281d6ff68967	150	static ip_addr_t allsystems;
hexley	0:281d6ff68967	151	static ip_addr_t allrouters;
hexley	0:281d6ff68967	152
hexley	0:281d6ff68967	153
hexley	0:281d6ff68967	154	/**
hexley	0:281d6ff68967	155	* Initialize the IGMP module
hexley	0:281d6ff68967	156	*/
hexley	0:281d6ff68967	157	void
hexley	0:281d6ff68967	158	igmp_init(void)
hexley	0:281d6ff68967	159	{
hexley	0:281d6ff68967	160	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
hexley	0:281d6ff68967	161
hexley	0:281d6ff68967	162	IP4_ADDR(&allsystems, 224, 0, 0, 1);
hexley	0:281d6ff68967	163	IP4_ADDR(&allrouters, 224, 0, 0, 2);
hexley	0:281d6ff68967	164	}
hexley	0:281d6ff68967	165
hexley	0:281d6ff68967	166	#ifdef LWIP_DEBUG
hexley	0:281d6ff68967	167	/**
hexley	0:281d6ff68967	168	* Dump global IGMP groups list
hexley	0:281d6ff68967	169	*/
hexley	0:281d6ff68967	170	void
hexley	0:281d6ff68967	171	igmp_dump_group_list()
hexley	0:281d6ff68967	172	{
hexley	0:281d6ff68967	173	struct igmp_group *group = igmp_group_list;
hexley	0:281d6ff68967	174
hexley	0:281d6ff68967	175	while (group != NULL) {
hexley	0:281d6ff68967	176	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
hexley	0:281d6ff68967	177	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
hexley	0:281d6ff68967	178	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
hexley	0:281d6ff68967	179	group = group->next;
hexley	0:281d6ff68967	180	}
hexley	0:281d6ff68967	181	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
hexley	0:281d6ff68967	182	}
hexley	0:281d6ff68967	183	#else
hexley	0:281d6ff68967	184	#define igmp_dump_group_list()
hexley	0:281d6ff68967	185	#endif /* LWIP_DEBUG */
hexley	0:281d6ff68967	186
hexley	0:281d6ff68967	187	/**
hexley	0:281d6ff68967	188	* Start IGMP processing on interface
hexley	0:281d6ff68967	189	*
hexley	0:281d6ff68967	190	* @param netif network interface on which start IGMP processing
hexley	0:281d6ff68967	191	*/
hexley	0:281d6ff68967	192	err_t
hexley	0:281d6ff68967	193	igmp_start(struct netif *netif)
hexley	0:281d6ff68967	194	{
hexley	0:281d6ff68967	195	struct igmp_group* group;
hexley	0:281d6ff68967	196
hexley	0:281d6ff68967	197	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
hexley	0:281d6ff68967	198
hexley	0:281d6ff68967	199	group = igmp_lookup_group(netif, &allsystems);
hexley	0:281d6ff68967	200
hexley	0:281d6ff68967	201	if (group != NULL) {
hexley	0:281d6ff68967	202	group->group_state = IGMP_GROUP_IDLE_MEMBER;
hexley	0:281d6ff68967	203	group->use++;
hexley	0:281d6ff68967	204
hexley	0:281d6ff68967	205	/* Allow the igmp messages at the MAC level */
hexley	0:281d6ff68967	206	if (netif->igmp_mac_filter != NULL) {
hexley	0:281d6ff68967	207	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
hexley	0:281d6ff68967	208	ip_addr_debug_print(IGMP_DEBUG, &allsystems);
hexley	0:281d6ff68967	209	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
hexley	0:281d6ff68967	210	netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
hexley	0:281d6ff68967	211	}
hexley	0:281d6ff68967	212
hexley	0:281d6ff68967	213	return ERR_OK;
hexley	0:281d6ff68967	214	}
hexley	0:281d6ff68967	215
hexley	0:281d6ff68967	216	return ERR_MEM;
hexley	0:281d6ff68967	217	}
hexley	0:281d6ff68967	218
hexley	0:281d6ff68967	219	/**
hexley	0:281d6ff68967	220	* Stop IGMP processing on interface
hexley	0:281d6ff68967	221	*
hexley	0:281d6ff68967	222	* @param netif network interface on which stop IGMP processing
hexley	0:281d6ff68967	223	*/
hexley	0:281d6ff68967	224	err_t
hexley	0:281d6ff68967	225	igmp_stop(struct netif *netif)
hexley	0:281d6ff68967	226	{
hexley	0:281d6ff68967	227	struct igmp_group *group = igmp_group_list;
hexley	0:281d6ff68967	228	struct igmp_group *prev = NULL;
hexley	0:281d6ff68967	229	struct igmp_group *next;
hexley	0:281d6ff68967	230
hexley	0:281d6ff68967	231	/* look for groups joined on this interface further down the list */
hexley	0:281d6ff68967	232	while (group != NULL) {
hexley	0:281d6ff68967	233	next = group->next;
hexley	0:281d6ff68967	234	/* is it a group joined on this interface? */
hexley	0:281d6ff68967	235	if (group->netif == netif) {
hexley	0:281d6ff68967	236	/* is it the first group of the list? */
hexley	0:281d6ff68967	237	if (group == igmp_group_list) {
hexley	0:281d6ff68967	238	igmp_group_list = next;
hexley	0:281d6ff68967	239	}
hexley	0:281d6ff68967	240	/* is there a "previous" group defined? */
hexley	0:281d6ff68967	241	if (prev != NULL) {
hexley	0:281d6ff68967	242	prev->next = next;
hexley	0:281d6ff68967	243	}
hexley	0:281d6ff68967	244	/* disable the group at the MAC level */
hexley	0:281d6ff68967	245	if (netif->igmp_mac_filter != NULL) {
hexley	0:281d6ff68967	246	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
hexley	0:281d6ff68967	247	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
hexley	0:281d6ff68967	248	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
hexley	0:281d6ff68967	249	netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
hexley	0:281d6ff68967	250	}
hexley	0:281d6ff68967	251	/* free group */
hexley	0:281d6ff68967	252	memp_free(MEMP_IGMP_GROUP, group);
hexley	0:281d6ff68967	253	} else {
hexley	0:281d6ff68967	254	/* change the "previous" */
hexley	0:281d6ff68967	255	prev = group;
hexley	0:281d6ff68967	256	}
hexley	0:281d6ff68967	257	/* move to "next" */
hexley	0:281d6ff68967	258	group = next;
hexley	0:281d6ff68967	259	}
hexley	0:281d6ff68967	260	return ERR_OK;
hexley	0:281d6ff68967	261	}
hexley	0:281d6ff68967	262
hexley	0:281d6ff68967	263	/**
hexley	0:281d6ff68967	264	* Report IGMP memberships for this interface
hexley	0:281d6ff68967	265	*
hexley	0:281d6ff68967	266	* @param netif network interface on which report IGMP memberships
hexley	0:281d6ff68967	267	*/
hexley	0:281d6ff68967	268	void
hexley	0:281d6ff68967	269	igmp_report_groups(struct netif *netif)
hexley	0:281d6ff68967	270	{
hexley	0:281d6ff68967	271	struct igmp_group *group = igmp_group_list;
hexley	0:281d6ff68967	272
hexley	0:281d6ff68967	273	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
hexley	0:281d6ff68967	274
hexley	0:281d6ff68967	275	while (group != NULL) {
hexley	0:281d6ff68967	276	if (group->netif == netif) {
hexley	0:281d6ff68967	277	igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
hexley	0:281d6ff68967	278	}
hexley	0:281d6ff68967	279	group = group->next;
hexley	0:281d6ff68967	280	}
hexley	0:281d6ff68967	281	}
hexley	0:281d6ff68967	282
hexley	0:281d6ff68967	283	/**
hexley	0:281d6ff68967	284	* Search for a group in the global igmp_group_list
hexley	0:281d6ff68967	285	*
hexley	0:281d6ff68967	286	* @param ifp the network interface for which to look
hexley	0:281d6ff68967	287	* @param addr the group ip address to search for
hexley	0:281d6ff68967	288	* @return a struct igmp_group* if the group has been found,
hexley	0:281d6ff68967	289	* NULL if the group wasn't found.
hexley	0:281d6ff68967	290	*/
hexley	0:281d6ff68967	291	struct igmp_group *
hexley	0:281d6ff68967	292	igmp_lookfor_group(struct netif ifp, ip_addr_t addr)
hexley	0:281d6ff68967	293	{
hexley	0:281d6ff68967	294	struct igmp_group *group = igmp_group_list;
hexley	0:281d6ff68967	295
hexley	0:281d6ff68967	296	while (group != NULL) {
hexley	0:281d6ff68967	297	if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
hexley	0:281d6ff68967	298	return group;
hexley	0:281d6ff68967	299	}
hexley	0:281d6ff68967	300	group = group->next;
hexley	0:281d6ff68967	301	}
hexley	0:281d6ff68967	302
hexley	0:281d6ff68967	303	/* to be clearer, we return NULL here instead of
hexley	0:281d6ff68967	304	* 'group' (which is also NULL at this point).
hexley	0:281d6ff68967	305	*/
hexley	0:281d6ff68967	306	return NULL;
hexley	0:281d6ff68967	307	}
hexley	0:281d6ff68967	308
hexley	0:281d6ff68967	309	/**
hexley	0:281d6ff68967	310	* Search for a specific igmp group and create a new one if not found-
hexley	0:281d6ff68967	311	*
hexley	0:281d6ff68967	312	* @param ifp the network interface for which to look
hexley	0:281d6ff68967	313	* @param addr the group ip address to search
hexley	0:281d6ff68967	314	* @return a struct igmp_group*,
hexley	0:281d6ff68967	315	* NULL on memory error.
hexley	0:281d6ff68967	316	*/
hexley	0:281d6ff68967	317	struct igmp_group *
hexley	0:281d6ff68967	318	igmp_lookup_group(struct netif ifp, ip_addr_t addr)
hexley	0:281d6ff68967	319	{
hexley	0:281d6ff68967	320	struct igmp_group *group = igmp_group_list;
hexley	0:281d6ff68967	321
hexley	0:281d6ff68967	322	/* Search if the group already exists */
hexley	0:281d6ff68967	323	group = igmp_lookfor_group(ifp, addr);
hexley	0:281d6ff68967	324	if (group != NULL) {
hexley	0:281d6ff68967	325	/* Group already exists. */
hexley	0:281d6ff68967	326	return group;
hexley	0:281d6ff68967	327	}
hexley	0:281d6ff68967	328
hexley	0:281d6ff68967	329	/* Group doesn't exist yet, create a new one */
hexley	0:281d6ff68967	330	group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
hexley	0:281d6ff68967	331	if (group != NULL) {
hexley	0:281d6ff68967	332	group->netif = ifp;
hexley	0:281d6ff68967	333	ip_addr_set(&(group->group_address), addr);
hexley	0:281d6ff68967	334	group->timer = 0; /* Not running */
hexley	0:281d6ff68967	335	group->group_state = IGMP_GROUP_NON_MEMBER;
hexley	0:281d6ff68967	336	group->last_reporter_flag = 0;
hexley	0:281d6ff68967	337	group->use = 0;
hexley	0:281d6ff68967	338	group->next = igmp_group_list;
hexley	0:281d6ff68967	339
hexley	0:281d6ff68967	340	igmp_group_list = group;
hexley	0:281d6ff68967	341	}
hexley	0:281d6ff68967	342
hexley	0:281d6ff68967	343	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
hexley	0:281d6ff68967	344	ip_addr_debug_print(IGMP_DEBUG, addr);
hexley	0:281d6ff68967	345	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
hexley	0:281d6ff68967	346
hexley	0:281d6ff68967	347	return group;
hexley	0:281d6ff68967	348	}
hexley	0:281d6ff68967	349
hexley	0:281d6ff68967	350	/**
hexley	0:281d6ff68967	351	* Remove a group in the global igmp_group_list
hexley	0:281d6ff68967	352	*
hexley	0:281d6ff68967	353	* @param group the group to remove from the global igmp_group_list
hexley	0:281d6ff68967	354	* @return ERR_OK if group was removed from the list, an err_t otherwise
hexley	0:281d6ff68967	355	*/
hexley	0:281d6ff68967	356	static err_t
hexley	0:281d6ff68967	357	igmp_remove_group(struct igmp_group *group)
hexley	0:281d6ff68967	358	{
hexley	0:281d6ff68967	359	err_t err = ERR_OK;
hexley	0:281d6ff68967	360
hexley	0:281d6ff68967	361	/* Is it the first group? */
hexley	0:281d6ff68967	362	if (igmp_group_list == group) {
hexley	0:281d6ff68967	363	igmp_group_list = group->next;
hexley	0:281d6ff68967	364	} else {
hexley	0:281d6ff68967	365	/* look for group further down the list */
hexley	0:281d6ff68967	366	struct igmp_group *tmpGroup;
hexley	0:281d6ff68967	367	for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
hexley	0:281d6ff68967	368	if (tmpGroup->next == group) {
hexley	0:281d6ff68967	369	tmpGroup->next = group->next;
hexley	0:281d6ff68967	370	break;
hexley	0:281d6ff68967	371	}
hexley	0:281d6ff68967	372	}
hexley	0:281d6ff68967	373	/* Group not found in the global igmp_group_list */
hexley	0:281d6ff68967	374	if (tmpGroup == NULL)
hexley	0:281d6ff68967	375	err = ERR_ARG;
hexley	0:281d6ff68967	376	}
hexley	0:281d6ff68967	377	/* free group */
hexley	0:281d6ff68967	378	memp_free(MEMP_IGMP_GROUP, group);
hexley	0:281d6ff68967	379
hexley	0:281d6ff68967	380	return err;
hexley	0:281d6ff68967	381	}
hexley	0:281d6ff68967	382
hexley	0:281d6ff68967	383	/**
hexley	0:281d6ff68967	384	* Called from ip_input() if a new IGMP packet is received.
hexley	0:281d6ff68967	385	*
hexley	0:281d6ff68967	386	* @param p received igmp packet, p->payload pointing to the ip header
hexley	0:281d6ff68967	387	* @param inp network interface on which the packet was received
hexley	0:281d6ff68967	388	* @param dest destination ip address of the igmp packet
hexley	0:281d6ff68967	389	*/
hexley	0:281d6ff68967	390	void
hexley	0:281d6ff68967	391	igmp_input(struct pbuf p, struct netif inp, ip_addr_t *dest)
hexley	0:281d6ff68967	392	{
hexley	0:281d6ff68967	393	struct ip_hdr * iphdr;
hexley	0:281d6ff68967	394	struct igmp_msg* igmp;
hexley	0:281d6ff68967	395	struct igmp_group* group;
hexley	0:281d6ff68967	396	struct igmp_group* groupref;
hexley	0:281d6ff68967	397
hexley	0:281d6ff68967	398	IGMP_STATS_INC(igmp.recv);
hexley	0:281d6ff68967	399
hexley	0:281d6ff68967	400	/* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
hexley	0:281d6ff68967	401	iphdr = (struct ip_hdr *)p->payload;
hexley	0:281d6ff68967	402	if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) \|\| (p->len < IGMP_MINLEN)) {
hexley	0:281d6ff68967	403	pbuf_free(p);
hexley	0:281d6ff68967	404	IGMP_STATS_INC(igmp.lenerr);
hexley	0:281d6ff68967	405	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
hexley	0:281d6ff68967	406	return;
hexley	0:281d6ff68967	407	}
hexley	0:281d6ff68967	408
hexley	0:281d6ff68967	409	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
hexley	0:281d6ff68967	410	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
hexley	0:281d6ff68967	411	LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
hexley	0:281d6ff68967	412	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
hexley	0:281d6ff68967	413	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
hexley	0:281d6ff68967	414
hexley	0:281d6ff68967	415	/* Now calculate and check the checksum */
hexley	0:281d6ff68967	416	igmp = (struct igmp_msg *)p->payload;
hexley	0:281d6ff68967	417	if (inet_chksum(igmp, p->len)) {
hexley	0:281d6ff68967	418	pbuf_free(p);
hexley	0:281d6ff68967	419	IGMP_STATS_INC(igmp.chkerr);
hexley	0:281d6ff68967	420	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
hexley	0:281d6ff68967	421	return;
hexley	0:281d6ff68967	422	}
hexley	0:281d6ff68967	423
hexley	0:281d6ff68967	424	/* Packet is ok so find an existing group */
hexley	0:281d6ff68967	425	group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
hexley	0:281d6ff68967	426
hexley	0:281d6ff68967	427	/* If group can be found or create... */
hexley	0:281d6ff68967	428	if (!group) {
hexley	0:281d6ff68967	429	pbuf_free(p);
hexley	0:281d6ff68967	430	IGMP_STATS_INC(igmp.drop);
hexley	0:281d6ff68967	431	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
hexley	0:281d6ff68967	432	return;
hexley	0:281d6ff68967	433	}
hexley	0:281d6ff68967	434
hexley	0:281d6ff68967	435	/* NOW ACT ON THE INCOMING MESSAGE TYPE... */
hexley	0:281d6ff68967	436	switch (igmp->igmp_msgtype) {
hexley	0:281d6ff68967	437	case IGMP_MEMB_QUERY: {
hexley	0:281d6ff68967	438	/* IGMP_MEMB_QUERY to the "all systems" address ? */
hexley	0:281d6ff68967	439	if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
hexley	0:281d6ff68967	440	/* THIS IS THE GENERAL QUERY */
hexley	0:281d6ff68967	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)));
hexley	0:281d6ff68967	442
hexley	0:281d6ff68967	443	if (igmp->igmp_maxresp == 0) {
hexley	0:281d6ff68967	444	IGMP_STATS_INC(igmp.rx_v1);
hexley	0:281d6ff68967	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"));
hexley	0:281d6ff68967	446	igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
hexley	0:281d6ff68967	447	} else {
hexley	0:281d6ff68967	448	IGMP_STATS_INC(igmp.rx_general);
hexley	0:281d6ff68967	449	}
hexley	0:281d6ff68967	450
hexley	0:281d6ff68967	451	groupref = igmp_group_list;
hexley	0:281d6ff68967	452	while (groupref) {
hexley	0:281d6ff68967	453	/* Do not send messages on the all systems group address! */
hexley	0:281d6ff68967	454	if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
hexley	0:281d6ff68967	455	igmp_delaying_member(groupref, igmp->igmp_maxresp);
hexley	0:281d6ff68967	456	}
hexley	0:281d6ff68967	457	groupref = groupref->next;
hexley	0:281d6ff68967	458	}
hexley	0:281d6ff68967	459	} else {
hexley	0:281d6ff68967	460	/* IGMP_MEMB_QUERY to a specific group ? */
hexley	0:281d6ff68967	461	if (!ip_addr_isany(&igmp->igmp_group_address)) {
hexley	0:281d6ff68967	462	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
hexley	0:281d6ff68967	463	ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
hexley	0:281d6ff68967	464	if (ip_addr_cmp(dest, &allsystems)) {
hexley	0:281d6ff68967	465	ip_addr_t groupaddr;
hexley	0:281d6ff68967	466	LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
hexley	0:281d6ff68967	467	/* we first need to re-look for the group since we used dest last time */
hexley	0:281d6ff68967	468	ip_addr_copy(groupaddr, igmp->igmp_group_address);
hexley	0:281d6ff68967	469	group = igmp_lookfor_group(inp, &groupaddr);
hexley	0:281d6ff68967	470	} else {
hexley	0:281d6ff68967	471	LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
hexley	0:281d6ff68967	472	}
hexley	0:281d6ff68967	473
hexley	0:281d6ff68967	474	if (group != NULL) {
hexley	0:281d6ff68967	475	IGMP_STATS_INC(igmp.rx_group);
hexley	0:281d6ff68967	476	igmp_delaying_member(group, igmp->igmp_maxresp);
hexley	0:281d6ff68967	477	} else {
hexley	0:281d6ff68967	478	IGMP_STATS_INC(igmp.drop);
hexley	0:281d6ff68967	479	}
hexley	0:281d6ff68967	480	} else {
hexley	0:281d6ff68967	481	IGMP_STATS_INC(igmp.proterr);
hexley	0:281d6ff68967	482	}
hexley	0:281d6ff68967	483	}
hexley	0:281d6ff68967	484	break;
hexley	0:281d6ff68967	485	}
hexley	0:281d6ff68967	486	case IGMP_V2_MEMB_REPORT: {
hexley	0:281d6ff68967	487	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
hexley	0:281d6ff68967	488	IGMP_STATS_INC(igmp.rx_report);
hexley	0:281d6ff68967	489	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
hexley	0:281d6ff68967	490	/* This is on a specific group we have already looked up */
hexley	0:281d6ff68967	491	group->timer = 0; /* stopped */
hexley	0:281d6ff68967	492	group->group_state = IGMP_GROUP_IDLE_MEMBER;
hexley	0:281d6ff68967	493	group->last_reporter_flag = 0;
hexley	0:281d6ff68967	494	}
hexley	0:281d6ff68967	495	break;
hexley	0:281d6ff68967	496	}
hexley	0:281d6ff68967	497	default: {
hexley	0:281d6ff68967	498	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
hexley	0:281d6ff68967	499	igmp->igmp_msgtype, group->group_state, &group, group->netif));
hexley	0:281d6ff68967	500	IGMP_STATS_INC(igmp.proterr);
hexley	0:281d6ff68967	501	break;
hexley	0:281d6ff68967	502	}
hexley	0:281d6ff68967	503	}
hexley	0:281d6ff68967	504
hexley	0:281d6ff68967	505	pbuf_free(p);
hexley	0:281d6ff68967	506	return;
hexley	0:281d6ff68967	507	}
hexley	0:281d6ff68967	508
hexley	0:281d6ff68967	509	/**
hexley	0:281d6ff68967	510	* Join a group on one network interface.
hexley	0:281d6ff68967	511	*
hexley	0:281d6ff68967	512	* @param ifaddr ip address of the network interface which should join a new group
hexley	0:281d6ff68967	513	* @param groupaddr the ip address of the group which to join
hexley	0:281d6ff68967	514	* @return ERR_OK if group was joined on the netif(s), an err_t otherwise
hexley	0:281d6ff68967	515	*/
hexley	0:281d6ff68967	516	err_t
hexley	0:281d6ff68967	517	igmp_joingroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
hexley	0:281d6ff68967	518	{
hexley	0:281d6ff68967	519	err_t err = ERR_VAL; /* no matching interface */
hexley	0:281d6ff68967	520	struct igmp_group *group;
hexley	0:281d6ff68967	521	struct netif *netif;
hexley	0:281d6ff68967	522
hexley	0:281d6ff68967	523	/* make sure it is multicast address */
hexley	0:281d6ff68967	524	LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
hexley	0:281d6ff68967	525	LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
hexley	0:281d6ff68967	526
hexley	0:281d6ff68967	527	/* loop through netif's */
hexley	0:281d6ff68967	528	netif = netif_list;
hexley	0:281d6ff68967	529	while (netif != NULL) {
hexley	0:281d6ff68967	530	/* Should we join this interface ? */
hexley	0:281d6ff68967	531	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
hexley	0:281d6ff68967	532	/* find group or create a new one if not found */
hexley	0:281d6ff68967	533	group = igmp_lookup_group(netif, groupaddr);
hexley	0:281d6ff68967	534
hexley	0:281d6ff68967	535	if (group != NULL) {
hexley	0:281d6ff68967	536	/* This should create a new group, check the state to make sure */
hexley	0:281d6ff68967	537	if (group->group_state != IGMP_GROUP_NON_MEMBER) {
hexley	0:281d6ff68967	538	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
hexley	0:281d6ff68967	539	} else {
hexley	0:281d6ff68967	540	/* OK - it was new group */
hexley	0:281d6ff68967	541	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
hexley	0:281d6ff68967	542	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
hexley	0:281d6ff68967	543	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
hexley	0:281d6ff68967	544
hexley	0:281d6ff68967	545	/* If first use of the group, allow the group at the MAC level */
hexley	0:281d6ff68967	546	if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
hexley	0:281d6ff68967	547	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
hexley	0:281d6ff68967	548	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
hexley	0:281d6ff68967	549	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
hexley	0:281d6ff68967	550	netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
hexley	0:281d6ff68967	551	}
hexley	0:281d6ff68967	552
hexley	0:281d6ff68967	553	IGMP_STATS_INC(igmp.tx_join);
hexley	0:281d6ff68967	554	igmp_send(group, IGMP_V2_MEMB_REPORT);
hexley	0:281d6ff68967	555
hexley	0:281d6ff68967	556	igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
hexley	0:281d6ff68967	557
hexley	0:281d6ff68967	558	/* Need to work out where this timer comes from */
hexley	0:281d6ff68967	559	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
hexley	0:281d6ff68967	560	}
hexley	0:281d6ff68967	561	/* Increment group use */
hexley	0:281d6ff68967	562	group->use++;
hexley	0:281d6ff68967	563	/* Join on this interface */
hexley	0:281d6ff68967	564	err = ERR_OK;
hexley	0:281d6ff68967	565	} else {
hexley	0:281d6ff68967	566	/* Return an error even if some network interfaces are joined */
hexley	0:281d6ff68967	567	/** @todo undo any other netif already joined */
hexley	0:281d6ff68967	568	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
hexley	0:281d6ff68967	569	return ERR_MEM;
hexley	0:281d6ff68967	570	}
hexley	0:281d6ff68967	571	}
hexley	0:281d6ff68967	572	/* proceed to next network interface */
hexley	0:281d6ff68967	573	netif = netif->next;
hexley	0:281d6ff68967	574	}
hexley	0:281d6ff68967	575
hexley	0:281d6ff68967	576	return err;
hexley	0:281d6ff68967	577	}
hexley	0:281d6ff68967	578
hexley	0:281d6ff68967	579	/**
hexley	0:281d6ff68967	580	* Leave a group on one network interface.
hexley	0:281d6ff68967	581	*
hexley	0:281d6ff68967	582	* @param ifaddr ip address of the network interface which should leave a group
hexley	0:281d6ff68967	583	* @param groupaddr the ip address of the group which to leave
hexley	0:281d6ff68967	584	* @return ERR_OK if group was left on the netif(s), an err_t otherwise
hexley	0:281d6ff68967	585	*/
hexley	0:281d6ff68967	586	err_t
hexley	0:281d6ff68967	587	igmp_leavegroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
hexley	0:281d6ff68967	588	{
hexley	0:281d6ff68967	589	err_t err = ERR_VAL; /* no matching interface */
hexley	0:281d6ff68967	590	struct igmp_group *group;
hexley	0:281d6ff68967	591	struct netif *netif;
hexley	0:281d6ff68967	592
hexley	0:281d6ff68967	593	/* make sure it is multicast address */
hexley	0:281d6ff68967	594	LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
hexley	0:281d6ff68967	595	LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
hexley	0:281d6ff68967	596
hexley	0:281d6ff68967	597	/* loop through netif's */
hexley	0:281d6ff68967	598	netif = netif_list;
hexley	0:281d6ff68967	599	while (netif != NULL) {
hexley	0:281d6ff68967	600	/* Should we leave this interface ? */
hexley	0:281d6ff68967	601	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
hexley	0:281d6ff68967	602	/* find group */
hexley	0:281d6ff68967	603	group = igmp_lookfor_group(netif, groupaddr);
hexley	0:281d6ff68967	604
hexley	0:281d6ff68967	605	if (group != NULL) {
hexley	0:281d6ff68967	606	/* Only send a leave if the flag is set according to the state diagram */
hexley	0:281d6ff68967	607	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
hexley	0:281d6ff68967	608	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
hexley	0:281d6ff68967	609	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
hexley	0:281d6ff68967	610
hexley	0:281d6ff68967	611	/* If there is no other use of the group */
hexley	0:281d6ff68967	612	if (group->use <= 1) {
hexley	0:281d6ff68967	613	/* If we are the last reporter for this group */
hexley	0:281d6ff68967	614	if (group->last_reporter_flag) {
hexley	0:281d6ff68967	615	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
hexley	0:281d6ff68967	616	IGMP_STATS_INC(igmp.tx_leave);
hexley	0:281d6ff68967	617	igmp_send(group, IGMP_LEAVE_GROUP);
hexley	0:281d6ff68967	618	}
hexley	0:281d6ff68967	619
hexley	0:281d6ff68967	620	/* Disable the group at the MAC level */
hexley	0:281d6ff68967	621	if (netif->igmp_mac_filter != NULL) {
hexley	0:281d6ff68967	622	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
hexley	0:281d6ff68967	623	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
hexley	0:281d6ff68967	624	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
hexley	0:281d6ff68967	625	netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
hexley	0:281d6ff68967	626	}
hexley	0:281d6ff68967	627
hexley	0:281d6ff68967	628	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
hexley	0:281d6ff68967	629	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
hexley	0:281d6ff68967	630	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
hexley	0:281d6ff68967	631
hexley	0:281d6ff68967	632	/* Free the group */
hexley	0:281d6ff68967	633	igmp_remove_group(group);
hexley	0:281d6ff68967	634	} else {
hexley	0:281d6ff68967	635	/* Decrement group use */
hexley	0:281d6ff68967	636	group->use--;
hexley	0:281d6ff68967	637	}
hexley	0:281d6ff68967	638	/* Leave on this interface */
hexley	0:281d6ff68967	639	err = ERR_OK;
hexley	0:281d6ff68967	640	} else {
hexley	0:281d6ff68967	641	/* It's not a fatal error on "leavegroup" */
hexley	0:281d6ff68967	642	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
hexley	0:281d6ff68967	643	}
hexley	0:281d6ff68967	644	}
hexley	0:281d6ff68967	645	/* proceed to next network interface */
hexley	0:281d6ff68967	646	netif = netif->next;
hexley	0:281d6ff68967	647	}
hexley	0:281d6ff68967	648
hexley	0:281d6ff68967	649	return err;
hexley	0:281d6ff68967	650	}
hexley	0:281d6ff68967	651
hexley	0:281d6ff68967	652	/**
hexley	0:281d6ff68967	653	* The igmp timer function (both for NO_SYS=1 and =0)
hexley	0:281d6ff68967	654	* Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
hexley	0:281d6ff68967	655	*/
hexley	0:281d6ff68967	656	void
hexley	0:281d6ff68967	657	igmp_tmr(void)
hexley	0:281d6ff68967	658	{
hexley	0:281d6ff68967	659	struct igmp_group *group = igmp_group_list;
hexley	0:281d6ff68967	660
hexley	0:281d6ff68967	661	while (group != NULL) {
hexley	0:281d6ff68967	662	if (group->timer > 0) {
hexley	0:281d6ff68967	663	group->timer--;
hexley	0:281d6ff68967	664	if (group->timer == 0) {
hexley	0:281d6ff68967	665	igmp_timeout(group);
hexley	0:281d6ff68967	666	}
hexley	0:281d6ff68967	667	}
hexley	0:281d6ff68967	668	group = group->next;
hexley	0:281d6ff68967	669	}
hexley	0:281d6ff68967	670	}
hexley	0:281d6ff68967	671
hexley	0:281d6ff68967	672	/**
hexley	0:281d6ff68967	673	* Called if a timeout for one group is reached.
hexley	0:281d6ff68967	674	* Sends a report for this group.
hexley	0:281d6ff68967	675	*
hexley	0:281d6ff68967	676	* @param group an igmp_group for which a timeout is reached
hexley	0:281d6ff68967	677	*/
hexley	0:281d6ff68967	678	static void
hexley	0:281d6ff68967	679	igmp_timeout(struct igmp_group *group)
hexley	0:281d6ff68967	680	{
hexley	0:281d6ff68967	681	/* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
hexley	0:281d6ff68967	682	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
hexley	0:281d6ff68967	683	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
hexley	0:281d6ff68967	684	ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
hexley	0:281d6ff68967	685	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
hexley	0:281d6ff68967	686
hexley	0:281d6ff68967	687	IGMP_STATS_INC(igmp.tx_report);
hexley	0:281d6ff68967	688	igmp_send(group, IGMP_V2_MEMB_REPORT);
hexley	0:281d6ff68967	689	}
hexley	0:281d6ff68967	690	}
hexley	0:281d6ff68967	691
hexley	0:281d6ff68967	692	/**
hexley	0:281d6ff68967	693	* Start a timer for an igmp group
hexley	0:281d6ff68967	694	*
hexley	0:281d6ff68967	695	* @param group the igmp_group for which to start a timer
hexley	0:281d6ff68967	696	* @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
hexley	0:281d6ff68967	697	* every call to igmp_tmr())
hexley	0:281d6ff68967	698	*/
hexley	0:281d6ff68967	699	static void
hexley	0:281d6ff68967	700	igmp_start_timer(struct igmp_group *group, u8_t max_time)
hexley	0:281d6ff68967	701	{
hexley	0:281d6ff68967	702	/* ensure the input value is > 0 */
hexley	0:281d6ff68967	703	if (max_time == 0) {
hexley	0:281d6ff68967	704	max_time = 1;
hexley	0:281d6ff68967	705	}
hexley	0:281d6ff68967	706	/* ensure the random value is > 0 */
hexley	0:281d6ff68967	707	group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
hexley	0:281d6ff68967	708	}
hexley	0:281d6ff68967	709
hexley	0:281d6ff68967	710	/**
hexley	0:281d6ff68967	711	* Stop a timer for an igmp_group
hexley	0:281d6ff68967	712	*
hexley	0:281d6ff68967	713	* @param group the igmp_group for which to stop the timer
hexley	0:281d6ff68967	714	*/
hexley	0:281d6ff68967	715	static void
hexley	0:281d6ff68967	716	igmp_stop_timer(struct igmp_group *group)
hexley	0:281d6ff68967	717	{
hexley	0:281d6ff68967	718	group->timer = 0;
hexley	0:281d6ff68967	719	}
hexley	0:281d6ff68967	720
hexley	0:281d6ff68967	721	/**
hexley	0:281d6ff68967	722	* Delaying membership report for a group if necessary
hexley	0:281d6ff68967	723	*
hexley	0:281d6ff68967	724	* @param group the igmp_group for which "delaying" membership report
hexley	0:281d6ff68967	725	* @param maxresp query delay
hexley	0:281d6ff68967	726	*/
hexley	0:281d6ff68967	727	static void
hexley	0:281d6ff68967	728	igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
hexley	0:281d6ff68967	729	{
hexley	0:281d6ff68967	730	if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) \|\|
hexley	0:281d6ff68967	731	((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
hexley	0:281d6ff68967	732	((group->timer == 0) \|\| (maxresp < group->timer)))) {
hexley	0:281d6ff68967	733	igmp_start_timer(group, maxresp);
hexley	0:281d6ff68967	734	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
hexley	0:281d6ff68967	735	}
hexley	0:281d6ff68967	736	}
hexley	0:281d6ff68967	737
hexley	0:281d6ff68967	738
hexley	0:281d6ff68967	739	/**
hexley	0:281d6ff68967	740	* Sends an IP packet on a network interface. This function constructs the IP header
hexley	0:281d6ff68967	741	* and calculates the IP header checksum. If the source IP address is NULL,
hexley	0:281d6ff68967	742	* the IP address of the outgoing network interface is filled in as source address.
hexley	0:281d6ff68967	743	*
hexley	0:281d6ff68967	744	* @param p the packet to send (p->payload points to the data, e.g. next
hexley	0:281d6ff68967	745	protocol header; if dest == IP_HDRINCL, p already includes an IP
hexley	0:281d6ff68967	746	header and p->payload points to that IP header)
hexley	0:281d6ff68967	747	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
hexley	0:281d6ff68967	748	* IP address of the netif used to send is used as source address)
hexley	0:281d6ff68967	749	* @param dest the destination IP address to send the packet to
hexley	0:281d6ff68967	750	* @param ttl the TTL value to be set in the IP header
hexley	0:281d6ff68967	751	* @param proto the PROTOCOL to be set in the IP header
hexley	0:281d6ff68967	752	* @param netif the netif on which to send this packet
hexley	0:281d6ff68967	753	* @return ERR_OK if the packet was sent OK
hexley	0:281d6ff68967	754	* ERR_BUF if p doesn't have enough space for IP/LINK headers
hexley	0:281d6ff68967	755	* returns errors returned by netif->output
hexley	0:281d6ff68967	756	*/
hexley	0:281d6ff68967	757	static err_t
hexley	0:281d6ff68967	758	igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif)
hexley	0:281d6ff68967	759	{
hexley	0:281d6ff68967	760	/* This is the "router alert" option */
hexley	0:281d6ff68967	761	u16_t ra[2];
hexley	0:281d6ff68967	762	ra[0] = PP_HTONS(ROUTER_ALERT);
hexley	0:281d6ff68967	763	ra[1] = 0x0000; /* Router shall examine packet */
hexley	0:281d6ff68967	764	IGMP_STATS_INC(igmp.xmit);
hexley	0:281d6ff68967	765	return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
hexley	0:281d6ff68967	766	}
hexley	0:281d6ff68967	767
hexley	0:281d6ff68967	768	/**
hexley	0:281d6ff68967	769	* Send an igmp packet to a specific group.
hexley	0:281d6ff68967	770	*
hexley	0:281d6ff68967	771	* @param group the group to which to send the packet
hexley	0:281d6ff68967	772	* @param type the type of igmp packet to send
hexley	0:281d6ff68967	773	*/
hexley	0:281d6ff68967	774	static void
hexley	0:281d6ff68967	775	igmp_send(struct igmp_group *group, u8_t type)
hexley	0:281d6ff68967	776	{
hexley	0:281d6ff68967	777	struct pbuf* p = NULL;
hexley	0:281d6ff68967	778	struct igmp_msg* igmp = NULL;
hexley	0:281d6ff68967	779	ip_addr_t src = *IP_ADDR_ANY;
hexley	0:281d6ff68967	780	ip_addr_t* dest = NULL;
hexley	0:281d6ff68967	781
hexley	0:281d6ff68967	782	/* IP header + "router alert" option + IGMP header */
hexley	0:281d6ff68967	783	p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
hexley	0:281d6ff68967	784
hexley	0:281d6ff68967	785	if (p) {
hexley	0:281d6ff68967	786	igmp = (struct igmp_msg *)p->payload;
hexley	0:281d6ff68967	787	LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
hexley	0:281d6ff68967	788	(p->len >= sizeof(struct igmp_msg)));
hexley	0:281d6ff68967	789	ip_addr_copy(src, group->netif->ip_addr);
hexley	0:281d6ff68967	790
hexley	0:281d6ff68967	791	if (type == IGMP_V2_MEMB_REPORT) {
hexley	0:281d6ff68967	792	dest = &(group->group_address);
hexley	0:281d6ff68967	793	ip_addr_copy(igmp->igmp_group_address, group->group_address);
hexley	0:281d6ff68967	794	group->last_reporter_flag = 1; /* Remember we were the last to report */
hexley	0:281d6ff68967	795	} else {
hexley	0:281d6ff68967	796	if (type == IGMP_LEAVE_GROUP) {
hexley	0:281d6ff68967	797	dest = &allrouters;
hexley	0:281d6ff68967	798	ip_addr_copy(igmp->igmp_group_address, group->group_address);
hexley	0:281d6ff68967	799	}
hexley	0:281d6ff68967	800	}
hexley	0:281d6ff68967	801
hexley	0:281d6ff68967	802	if ((type == IGMP_V2_MEMB_REPORT) \|\| (type == IGMP_LEAVE_GROUP)) {
hexley	0:281d6ff68967	803	igmp->igmp_msgtype = type;
hexley	0:281d6ff68967	804	igmp->igmp_maxresp = 0;
hexley	0:281d6ff68967	805	igmp->igmp_checksum = 0;
hexley	0:281d6ff68967	806	igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
hexley	0:281d6ff68967	807
hexley	0:281d6ff68967	808	igmp_ip_output_if(p, &src, dest, group->netif);
hexley	0:281d6ff68967	809	}
hexley	0:281d6ff68967	810
hexley	0:281d6ff68967	811	pbuf_free(p);
hexley	0:281d6ff68967	812	} else {
hexley	0:281d6ff68967	813	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
hexley	0:281d6ff68967	814	IGMP_STATS_INC(igmp.memerr);
hexley	0:281d6ff68967	815	}
hexley	0:281d6ff68967	816	}
hexley	0:281d6ff68967	817
hexley	0:281d6ff68967	818	#endif /* LWIP_IGMP */

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Type:	Library
Created:	19 Nov 2010
Imports:	44
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

lwip/core/ipv4/igmp.c@0:281d6ff68967, 2010-11-19 (annotated)

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