Bonjour - First step: AutoIP compiled in and working

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Darran Shepherd / Mbed 2 deprecated Bonjour

First step: AutoIP compiled in and working

lwip/core/ipv4/igmp.c@1:4218cacaf696, 2010-06-18 (annotated)

Committer:: darran
Date:: Fri Jun 18 15:54:21 2010 +0000
Revision:: 1:4218cacaf696
Parent:: 0:55a05330f8cc

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:55a05330f8cc	1	/**
darran	0:55a05330f8cc	2	* @file
darran	0:55a05330f8cc	3	* IGMP - Internet Group Management Protocol
darran	0:55a05330f8cc	4	*
darran	0:55a05330f8cc	5	*/
darran	0:55a05330f8cc	6
darran	0:55a05330f8cc	7	/*
darran	0:55a05330f8cc	8	* Copyright (c) 2002 CITEL Technologies Ltd.
darran	0:55a05330f8cc	9	* All rights reserved.
darran	0:55a05330f8cc	10	*
darran	0:55a05330f8cc	11	* Redistribution and use in source and binary forms, with or without
darran	0:55a05330f8cc	12	* modification, are permitted provided that the following conditions
darran	0:55a05330f8cc	13	* are met:
darran	0:55a05330f8cc	14	* 1. Redistributions of source code must retain the above copyright
darran	0:55a05330f8cc	15	* notice, this list of conditions and the following disclaimer.
darran	0:55a05330f8cc	16	* 2. Redistributions in binary form must reproduce the above copyright
darran	0:55a05330f8cc	17	* notice, this list of conditions and the following disclaimer in the
darran	0:55a05330f8cc	18	* documentation and/or other materials provided with the distribution.
darran	0:55a05330f8cc	19	* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
darran	0:55a05330f8cc	20	* may be used to endorse or promote products derived from this software
darran	0:55a05330f8cc	21	* without specific prior written permission.
darran	0:55a05330f8cc	22	*
darran	0:55a05330f8cc	23	* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
darran	0:55a05330f8cc	24	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
darran	0:55a05330f8cc	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
darran	0:55a05330f8cc	26	* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
darran	0:55a05330f8cc	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
darran	0:55a05330f8cc	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
darran	0:55a05330f8cc	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
darran	0:55a05330f8cc	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
darran	0:55a05330f8cc	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
darran	0:55a05330f8cc	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
darran	0:55a05330f8cc	33	* SUCH DAMAGE.
darran	0:55a05330f8cc	34	*
darran	0:55a05330f8cc	35	* This file is a contribution to the lwIP TCP/IP stack.
darran	0:55a05330f8cc	36	* The Swedish Institute of Computer Science and Adam Dunkels
darran	0:55a05330f8cc	37	* are specifically granted permission to redistribute this
darran	0:55a05330f8cc	38	* source code.
darran	0:55a05330f8cc	39	*/
darran	0:55a05330f8cc	40
darran	0:55a05330f8cc	41	/*-------------------------------------------------------------
darran	0:55a05330f8cc	42	Note 1)
darran	0:55a05330f8cc	43	Although the rfc requires V1 AND V2 capability
darran	0:55a05330f8cc	44	we will only support v2 since now V1 is very old (August 1989)
darran	0:55a05330f8cc	45	V1 can be added if required
darran	0:55a05330f8cc	46
darran	0:55a05330f8cc	47	a debug print and statistic have been implemented to
darran	0:55a05330f8cc	48	show this up.
darran	0:55a05330f8cc	49	-------------------------------------------------------------
darran	0:55a05330f8cc	50	-------------------------------------------------------------
darran	0:55a05330f8cc	51	Note 2)
darran	0:55a05330f8cc	52	A query for a specific group address (as opposed to ALLHOSTS)
darran	0:55a05330f8cc	53	has now been implemented as I am unsure if it is required
darran	0:55a05330f8cc	54
darran	0:55a05330f8cc	55	a debug print and statistic have been implemented to
darran	0:55a05330f8cc	56	show this up.
darran	0:55a05330f8cc	57	-------------------------------------------------------------
darran	0:55a05330f8cc	58	-------------------------------------------------------------
darran	0:55a05330f8cc	59	Note 3)
darran	0:55a05330f8cc	60	The router alert rfc 2113 is implemented in outgoing packets
darran	0:55a05330f8cc	61	but not checked rigorously incoming
darran	0:55a05330f8cc	62	-------------------------------------------------------------
darran	0:55a05330f8cc	63	Steve Reynolds
darran	0:55a05330f8cc	64	------------------------------------------------------------*/
darran	0:55a05330f8cc	65
darran	0:55a05330f8cc	66	/*-----------------------------------------------------------------------------
darran	0:55a05330f8cc	67	* RFC 988 - Host extensions for IP multicasting - V0
darran	0:55a05330f8cc	68	* RFC 1054 - Host extensions for IP multicasting -
darran	0:55a05330f8cc	69	* RFC 1112 - Host extensions for IP multicasting - V1
darran	0:55a05330f8cc	70	* RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
darran	0:55a05330f8cc	71	* RFC 3376 - Internet Group Management Protocol, Version 3 - V3
darran	0:55a05330f8cc	72	* RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
darran	0:55a05330f8cc	73	* RFC 2113 - IP Router Alert Option -
darran	0:55a05330f8cc	74	----------------------------------------------------------------------------/
darran	0:55a05330f8cc	75
darran	0:55a05330f8cc	76	/*-----------------------------------------------------------------------------
darran	0:55a05330f8cc	77	* Includes
darran	0:55a05330f8cc	78	----------------------------------------------------------------------------/
darran	0:55a05330f8cc	79
darran	0:55a05330f8cc	80	#include "lwip/opt.h"
darran	0:55a05330f8cc	81
darran	0:55a05330f8cc	82	#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
darran	0:55a05330f8cc	83
darran	0:55a05330f8cc	84	#include "lwip/igmp.h"
darran	0:55a05330f8cc	85	#include "lwip/debug.h"
darran	0:55a05330f8cc	86	#include "lwip/def.h"
darran	0:55a05330f8cc	87	#include "lwip/mem.h"
darran	0:55a05330f8cc	88	#include "lwip/ip.h"
darran	0:55a05330f8cc	89	#include "lwip/inet_chksum.h"
darran	0:55a05330f8cc	90	#include "lwip/netif.h"
darran	0:55a05330f8cc	91	#include "lwip/icmp.h"
darran	0:55a05330f8cc	92	#include "lwip/udp.h"
darran	0:55a05330f8cc	93	#include "lwip/tcp.h"
darran	0:55a05330f8cc	94	#include "lwip/stats.h"
darran	0:55a05330f8cc	95
darran	0:55a05330f8cc	96	#include "string.h"
darran	0:55a05330f8cc	97
darran	0:55a05330f8cc	98	/*
darran	0:55a05330f8cc	99	* IGMP constants
darran	0:55a05330f8cc	100	*/
darran	0:55a05330f8cc	101	#define IGMP_TTL 1
darran	0:55a05330f8cc	102	#define IGMP_MINLEN 8
darran	0:55a05330f8cc	103	#define ROUTER_ALERT 0x9404
darran	0:55a05330f8cc	104	#define ROUTER_ALERTLEN 4
darran	0:55a05330f8cc	105
darran	0:55a05330f8cc	106	/*
darran	0:55a05330f8cc	107	* IGMP message types, including version number.
darran	0:55a05330f8cc	108	*/
darran	0:55a05330f8cc	109	#define IGMP_MEMB_QUERY 0x11 /* Membership query */
darran	0:55a05330f8cc	110	#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
darran	0:55a05330f8cc	111	#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
darran	0:55a05330f8cc	112	#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
darran	0:55a05330f8cc	113
darran	0:55a05330f8cc	114	/* Group membership states */
darran	0:55a05330f8cc	115	#define IGMP_GROUP_NON_MEMBER 0
darran	0:55a05330f8cc	116	#define IGMP_GROUP_DELAYING_MEMBER 1
darran	0:55a05330f8cc	117	#define IGMP_GROUP_IDLE_MEMBER 2
darran	0:55a05330f8cc	118
darran	0:55a05330f8cc	119	/**
darran	0:55a05330f8cc	120	* IGMP packet format.
darran	0:55a05330f8cc	121	*/
darran	0:55a05330f8cc	122	#ifdef PACK_STRUCT_USE_INCLUDES
darran	0:55a05330f8cc	123	# include "arch/bpstruct.h"
darran	0:55a05330f8cc	124	#endif
darran	0:55a05330f8cc	125	PACK_STRUCT_BEGIN
darran	0:55a05330f8cc	126	struct igmp_msg {
darran	0:55a05330f8cc	127	PACK_STRUCT_FIELD(u8_t igmp_msgtype);
darran	0:55a05330f8cc	128	PACK_STRUCT_FIELD(u8_t igmp_maxresp);
darran	0:55a05330f8cc	129	PACK_STRUCT_FIELD(u16_t igmp_checksum);
darran	0:55a05330f8cc	130	PACK_STRUCT_FIELD(ip_addr_t igmp_group_address);
darran	0:55a05330f8cc	131	} PACK_STRUCT_STRUCT;
darran	0:55a05330f8cc	132	PACK_STRUCT_END
darran	0:55a05330f8cc	133	#ifdef PACK_STRUCT_USE_INCLUDES
darran	0:55a05330f8cc	134	# include "arch/epstruct.h"
darran	0:55a05330f8cc	135	#endif
darran	0:55a05330f8cc	136
darran	0:55a05330f8cc	137
darran	0:55a05330f8cc	138	static struct igmp_group igmp_lookup_group(struct netif ifp, ip_addr_t *addr);
darran	0:55a05330f8cc	139	static err_t igmp_remove_group(struct igmp_group *group);
darran	0:55a05330f8cc	140	static void igmp_timeout( struct igmp_group *group);
darran	0:55a05330f8cc	141	static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
darran	0:55a05330f8cc	142	static void igmp_stop_timer(struct igmp_group *group);
darran	0:55a05330f8cc	143	static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
darran	0:55a05330f8cc	144	static err_t igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif);
darran	0:55a05330f8cc	145	static void igmp_send(struct igmp_group *group, u8_t type);
darran	0:55a05330f8cc	146
darran	0:55a05330f8cc	147
darran	0:55a05330f8cc	148	static struct igmp_group* igmp_group_list;
darran	0:55a05330f8cc	149	static ip_addr_t allsystems;
darran	0:55a05330f8cc	150	static ip_addr_t allrouters;
darran	0:55a05330f8cc	151
darran	0:55a05330f8cc	152
darran	0:55a05330f8cc	153	/**
darran	0:55a05330f8cc	154	* Initialize the IGMP module
darran	0:55a05330f8cc	155	*/
darran	0:55a05330f8cc	156	void
darran	0:55a05330f8cc	157	igmp_init(void)
darran	0:55a05330f8cc	158	{
darran	0:55a05330f8cc	159	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
darran	0:55a05330f8cc	160
darran	0:55a05330f8cc	161	IP4_ADDR(&allsystems, 224, 0, 0, 1);
darran	0:55a05330f8cc	162	IP4_ADDR(&allrouters, 224, 0, 0, 2);
darran	0:55a05330f8cc	163	}
darran	0:55a05330f8cc	164
darran	0:55a05330f8cc	165	#ifdef LWIP_DEBUG
darran	0:55a05330f8cc	166	/**
darran	0:55a05330f8cc	167	* Dump global IGMP groups list
darran	0:55a05330f8cc	168	*/
darran	0:55a05330f8cc	169	void
darran	0:55a05330f8cc	170	igmp_dump_group_list()
darran	0:55a05330f8cc	171	{
darran	0:55a05330f8cc	172	struct igmp_group *group = igmp_group_list;
darran	0:55a05330f8cc	173
darran	0:55a05330f8cc	174	while (group != NULL) {
darran	0:55a05330f8cc	175	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
darran	0:55a05330f8cc	176	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
darran	0:55a05330f8cc	177	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
darran	0:55a05330f8cc	178	group = group->next;
darran	0:55a05330f8cc	179	}
darran	0:55a05330f8cc	180	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
darran	0:55a05330f8cc	181	}
darran	0:55a05330f8cc	182	#else
darran	0:55a05330f8cc	183	#define igmp_dump_group_list()
darran	0:55a05330f8cc	184	#endif /* LWIP_DEBUG */
darran	0:55a05330f8cc	185
darran	0:55a05330f8cc	186	/**
darran	0:55a05330f8cc	187	* Start IGMP processing on interface
darran	0:55a05330f8cc	188	*
darran	0:55a05330f8cc	189	* @param netif network interface on which start IGMP processing
darran	0:55a05330f8cc	190	*/
darran	0:55a05330f8cc	191	err_t
darran	0:55a05330f8cc	192	igmp_start(struct netif *netif)
darran	0:55a05330f8cc	193	{
darran	0:55a05330f8cc	194	struct igmp_group* group;
darran	0:55a05330f8cc	195
darran	0:55a05330f8cc	196	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
darran	0:55a05330f8cc	197
darran	0:55a05330f8cc	198	group = igmp_lookup_group(netif, &allsystems);
darran	0:55a05330f8cc	199
darran	0:55a05330f8cc	200	if (group != NULL) {
darran	0:55a05330f8cc	201	group->group_state = IGMP_GROUP_IDLE_MEMBER;
darran	0:55a05330f8cc	202	group->use++;
darran	0:55a05330f8cc	203
darran	0:55a05330f8cc	204	/* Allow the igmp messages at the MAC level */
darran	0:55a05330f8cc	205	if (netif->igmp_mac_filter != NULL) {
darran	0:55a05330f8cc	206	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
darran	0:55a05330f8cc	207	ip_addr_debug_print(IGMP_DEBUG, &allsystems);
darran	0:55a05330f8cc	208	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
darran	0:55a05330f8cc	209	netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
darran	0:55a05330f8cc	210	}
darran	0:55a05330f8cc	211
darran	0:55a05330f8cc	212	return ERR_OK;
darran	0:55a05330f8cc	213	}
darran	0:55a05330f8cc	214
darran	0:55a05330f8cc	215	return ERR_MEM;
darran	0:55a05330f8cc	216	}
darran	0:55a05330f8cc	217
darran	0:55a05330f8cc	218	/**
darran	0:55a05330f8cc	219	* Stop IGMP processing on interface
darran	0:55a05330f8cc	220	*
darran	0:55a05330f8cc	221	* @param netif network interface on which stop IGMP processing
darran	0:55a05330f8cc	222	*/
darran	0:55a05330f8cc	223	err_t
darran	0:55a05330f8cc	224	igmp_stop(struct netif *netif)
darran	0:55a05330f8cc	225	{
darran	0:55a05330f8cc	226	struct igmp_group *group = igmp_group_list;
darran	0:55a05330f8cc	227	struct igmp_group *prev = NULL;
darran	0:55a05330f8cc	228	struct igmp_group *next;
darran	0:55a05330f8cc	229
darran	0:55a05330f8cc	230	/* look for groups joined on this interface further down the list */
darran	0:55a05330f8cc	231	while (group != NULL) {
darran	0:55a05330f8cc	232	next = group->next;
darran	0:55a05330f8cc	233	/* is it a group joined on this interface? */
darran	0:55a05330f8cc	234	if (group->netif == netif) {
darran	0:55a05330f8cc	235	/* is it the first group of the list? */
darran	0:55a05330f8cc	236	if (group == igmp_group_list) {
darran	0:55a05330f8cc	237	igmp_group_list = next;
darran	0:55a05330f8cc	238	}
darran	0:55a05330f8cc	239	/* is there a "previous" group defined? */
darran	0:55a05330f8cc	240	if (prev != NULL) {
darran	0:55a05330f8cc	241	prev->next = next;
darran	0:55a05330f8cc	242	}
darran	0:55a05330f8cc	243	/* disable the group at the MAC level */
darran	0:55a05330f8cc	244	if (netif->igmp_mac_filter != NULL) {
darran	0:55a05330f8cc	245	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
darran	0:55a05330f8cc	246	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
darran	0:55a05330f8cc	247	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
darran	0:55a05330f8cc	248	netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
darran	0:55a05330f8cc	249	}
darran	0:55a05330f8cc	250	/* free group */
darran	0:55a05330f8cc	251	memp_free(MEMP_IGMP_GROUP, group);
darran	0:55a05330f8cc	252	} else {
darran	0:55a05330f8cc	253	/* change the "previous" */
darran	0:55a05330f8cc	254	prev = group;
darran	0:55a05330f8cc	255	}
darran	0:55a05330f8cc	256	/* move to "next" */
darran	0:55a05330f8cc	257	group = next;
darran	0:55a05330f8cc	258	}
darran	0:55a05330f8cc	259	return ERR_OK;
darran	0:55a05330f8cc	260	}
darran	0:55a05330f8cc	261
darran	0:55a05330f8cc	262	/**
darran	0:55a05330f8cc	263	* Report IGMP memberships for this interface
darran	0:55a05330f8cc	264	*
darran	0:55a05330f8cc	265	* @param netif network interface on which report IGMP memberships
darran	0:55a05330f8cc	266	*/
darran	0:55a05330f8cc	267	void
darran	0:55a05330f8cc	268	igmp_report_groups(struct netif *netif)
darran	0:55a05330f8cc	269	{
darran	0:55a05330f8cc	270	struct igmp_group *group = igmp_group_list;
darran	0:55a05330f8cc	271
darran	0:55a05330f8cc	272	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
darran	0:55a05330f8cc	273
darran	0:55a05330f8cc	274	while (group != NULL) {
darran	0:55a05330f8cc	275	if (group->netif == netif) {
darran	0:55a05330f8cc	276	igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
darran	0:55a05330f8cc	277	}
darran	0:55a05330f8cc	278	group = group->next;
darran	0:55a05330f8cc	279	}
darran	0:55a05330f8cc	280	}
darran	0:55a05330f8cc	281
darran	0:55a05330f8cc	282	/**
darran	0:55a05330f8cc	283	* Search for a group in the global igmp_group_list
darran	0:55a05330f8cc	284	*
darran	0:55a05330f8cc	285	* @param ifp the network interface for which to look
darran	0:55a05330f8cc	286	* @param addr the group ip address to search for
darran	0:55a05330f8cc	287	* @return a struct igmp_group* if the group has been found,
darran	0:55a05330f8cc	288	* NULL if the group wasn't found.
darran	0:55a05330f8cc	289	*/
darran	0:55a05330f8cc	290	struct igmp_group *
darran	0:55a05330f8cc	291	igmp_lookfor_group(struct netif ifp, ip_addr_t addr)
darran	0:55a05330f8cc	292	{
darran	0:55a05330f8cc	293	struct igmp_group *group = igmp_group_list;
darran	0:55a05330f8cc	294
darran	0:55a05330f8cc	295	while (group != NULL) {
darran	0:55a05330f8cc	296	if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
darran	0:55a05330f8cc	297	return group;
darran	0:55a05330f8cc	298	}
darran	0:55a05330f8cc	299	group = group->next;
darran	0:55a05330f8cc	300	}
darran	0:55a05330f8cc	301
darran	0:55a05330f8cc	302	/* to be clearer, we return NULL here instead of
darran	0:55a05330f8cc	303	* 'group' (which is also NULL at this point).
darran	0:55a05330f8cc	304	*/
darran	0:55a05330f8cc	305	return NULL;
darran	0:55a05330f8cc	306	}
darran	0:55a05330f8cc	307
darran	0:55a05330f8cc	308	/**
darran	0:55a05330f8cc	309	* Search for a specific igmp group and create a new one if not found-
darran	0:55a05330f8cc	310	*
darran	0:55a05330f8cc	311	* @param ifp the network interface for which to look
darran	0:55a05330f8cc	312	* @param addr the group ip address to search
darran	0:55a05330f8cc	313	* @return a struct igmp_group*,
darran	0:55a05330f8cc	314	* NULL on memory error.
darran	0:55a05330f8cc	315	*/
darran	0:55a05330f8cc	316	struct igmp_group *
darran	0:55a05330f8cc	317	igmp_lookup_group(struct netif ifp, ip_addr_t addr)
darran	0:55a05330f8cc	318	{
darran	0:55a05330f8cc	319	struct igmp_group *group = igmp_group_list;
darran	0:55a05330f8cc	320
darran	0:55a05330f8cc	321	/* Search if the group already exists */
darran	0:55a05330f8cc	322	group = igmp_lookfor_group(ifp, addr);
darran	0:55a05330f8cc	323	if (group != NULL) {
darran	0:55a05330f8cc	324	/* Group already exists. */
darran	0:55a05330f8cc	325	return group;
darran	0:55a05330f8cc	326	}
darran	0:55a05330f8cc	327
darran	0:55a05330f8cc	328	/* Group doesn't exist yet, create a new one */
darran	0:55a05330f8cc	329	group = memp_malloc(MEMP_IGMP_GROUP);
darran	0:55a05330f8cc	330	if (group != NULL) {
darran	0:55a05330f8cc	331	group->netif = ifp;
darran	0:55a05330f8cc	332	ip_addr_set(&(group->group_address), addr);
darran	0:55a05330f8cc	333	group->timer = 0; /* Not running */
darran	0:55a05330f8cc	334	group->group_state = IGMP_GROUP_NON_MEMBER;
darran	0:55a05330f8cc	335	group->last_reporter_flag = 0;
darran	0:55a05330f8cc	336	group->use = 0;
darran	0:55a05330f8cc	337	group->next = igmp_group_list;
darran	0:55a05330f8cc	338
darran	0:55a05330f8cc	339	igmp_group_list = group;
darran	0:55a05330f8cc	340	}
darran	0:55a05330f8cc	341
darran	0:55a05330f8cc	342	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
darran	0:55a05330f8cc	343	ip_addr_debug_print(IGMP_DEBUG, addr);
darran	0:55a05330f8cc	344	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
darran	0:55a05330f8cc	345
darran	0:55a05330f8cc	346	return group;
darran	0:55a05330f8cc	347	}
darran	0:55a05330f8cc	348
darran	0:55a05330f8cc	349	/**
darran	0:55a05330f8cc	350	* Remove a group in the global igmp_group_list
darran	0:55a05330f8cc	351	*
darran	0:55a05330f8cc	352	* @param group the group to remove from the global igmp_group_list
darran	0:55a05330f8cc	353	* @return ERR_OK if group was removed from the list, an err_t otherwise
darran	0:55a05330f8cc	354	*/
darran	0:55a05330f8cc	355	static err_t
darran	0:55a05330f8cc	356	igmp_remove_group(struct igmp_group *group)
darran	0:55a05330f8cc	357	{
darran	0:55a05330f8cc	358	err_t err = ERR_OK;
darran	0:55a05330f8cc	359
darran	0:55a05330f8cc	360	/* Is it the first group? */
darran	0:55a05330f8cc	361	if (igmp_group_list == group) {
darran	0:55a05330f8cc	362	igmp_group_list = group->next;
darran	0:55a05330f8cc	363	} else {
darran	0:55a05330f8cc	364	/* look for group further down the list */
darran	0:55a05330f8cc	365	struct igmp_group *tmpGroup;
darran	0:55a05330f8cc	366	for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
darran	0:55a05330f8cc	367	if (tmpGroup->next == group) {
darran	0:55a05330f8cc	368	tmpGroup->next = group->next;
darran	0:55a05330f8cc	369	break;
darran	0:55a05330f8cc	370	}
darran	0:55a05330f8cc	371	}
darran	0:55a05330f8cc	372	/* Group not found in the global igmp_group_list */
darran	0:55a05330f8cc	373	if (tmpGroup == NULL)
darran	0:55a05330f8cc	374	err = ERR_ARG;
darran	0:55a05330f8cc	375	}
darran	0:55a05330f8cc	376	/* free group */
darran	0:55a05330f8cc	377	memp_free(MEMP_IGMP_GROUP, group);
darran	0:55a05330f8cc	378
darran	0:55a05330f8cc	379	return err;
darran	0:55a05330f8cc	380	}
darran	0:55a05330f8cc	381
darran	0:55a05330f8cc	382	/**
darran	0:55a05330f8cc	383	* Called from ip_input() if a new IGMP packet is received.
darran	0:55a05330f8cc	384	*
darran	0:55a05330f8cc	385	* @param p received igmp packet, p->payload pointing to the ip header
darran	0:55a05330f8cc	386	* @param inp network interface on which the packet was received
darran	0:55a05330f8cc	387	* @param dest destination ip address of the igmp packet
darran	0:55a05330f8cc	388	*/
darran	0:55a05330f8cc	389	void
darran	0:55a05330f8cc	390	igmp_input(struct pbuf p, struct netif inp, ip_addr_t *dest)
darran	0:55a05330f8cc	391	{
darran	0:55a05330f8cc	392	struct ip_hdr * iphdr;
darran	0:55a05330f8cc	393	struct igmp_msg* igmp;
darran	0:55a05330f8cc	394	struct igmp_group* group;
darran	0:55a05330f8cc	395	struct igmp_group* groupref;
darran	0:55a05330f8cc	396
darran	0:55a05330f8cc	397	IGMP_STATS_INC(igmp.recv);
darran	0:55a05330f8cc	398
darran	0:55a05330f8cc	399	/* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
darran	0:55a05330f8cc	400	iphdr = p->payload;
darran	0:55a05330f8cc	401	if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) \|\| (p->len < IGMP_MINLEN)) {
darran	0:55a05330f8cc	402	pbuf_free(p);
darran	0:55a05330f8cc	403	IGMP_STATS_INC(igmp.lenerr);
darran	0:55a05330f8cc	404	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
darran	0:55a05330f8cc	405	return;
darran	0:55a05330f8cc	406	}
darran	0:55a05330f8cc	407
darran	0:55a05330f8cc	408	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
darran	0:55a05330f8cc	409	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
darran	0:55a05330f8cc	410	LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
darran	0:55a05330f8cc	411	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
darran	0:55a05330f8cc	412	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
darran	0:55a05330f8cc	413
darran	0:55a05330f8cc	414	/* Now calculate and check the checksum */
darran	0:55a05330f8cc	415	igmp = (struct igmp_msg *)p->payload;
darran	0:55a05330f8cc	416	if (inet_chksum(igmp, p->len)) {
darran	0:55a05330f8cc	417	pbuf_free(p);
darran	0:55a05330f8cc	418	IGMP_STATS_INC(igmp.chkerr);
darran	0:55a05330f8cc	419	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
darran	0:55a05330f8cc	420	return;
darran	0:55a05330f8cc	421	}
darran	0:55a05330f8cc	422
darran	0:55a05330f8cc	423	/* Packet is ok so find an existing group */
darran	0:55a05330f8cc	424	group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
darran	0:55a05330f8cc	425
darran	0:55a05330f8cc	426	/* If group can be found or create... */
darran	0:55a05330f8cc	427	if (!group) {
darran	0:55a05330f8cc	428	pbuf_free(p);
darran	0:55a05330f8cc	429	IGMP_STATS_INC(igmp.drop);
darran	0:55a05330f8cc	430	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
darran	0:55a05330f8cc	431	return;
darran	0:55a05330f8cc	432	}
darran	0:55a05330f8cc	433
darran	0:55a05330f8cc	434	/* NOW ACT ON THE INCOMING MESSAGE TYPE... */
darran	0:55a05330f8cc	435	switch (igmp->igmp_msgtype) {
darran	0:55a05330f8cc	436	case IGMP_MEMB_QUERY: {
darran	0:55a05330f8cc	437	/* IGMP_MEMB_QUERY to the "all systems" address ? */
darran	0:55a05330f8cc	438	if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
darran	0:55a05330f8cc	439	/* THIS IS THE GENERAL QUERY */
darran	0:55a05330f8cc	440	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
darran	0:55a05330f8cc	441
darran	0:55a05330f8cc	442	if (igmp->igmp_maxresp == 0) {
darran	0:55a05330f8cc	443	IGMP_STATS_INC(igmp.rx_v1);
darran	0:55a05330f8cc	444	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
darran	0:55a05330f8cc	445	igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
darran	0:55a05330f8cc	446	}
darran	0:55a05330f8cc	447	else {
darran	0:55a05330f8cc	448	IGMP_STATS_INC(igmp.rx_general);
darran	0:55a05330f8cc	449	}
darran	0:55a05330f8cc	450
darran	0:55a05330f8cc	451	groupref = igmp_group_list;
darran	0:55a05330f8cc	452	while (groupref) {
darran	0:55a05330f8cc	453	/* Do not send messages on the all systems group address! */
darran	0:55a05330f8cc	454	if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
darran	0:55a05330f8cc	455	igmp_delaying_member(groupref, igmp->igmp_maxresp);
darran	0:55a05330f8cc	456	}
darran	0:55a05330f8cc	457	groupref = groupref->next;
darran	0:55a05330f8cc	458	}
darran	0:55a05330f8cc	459	} else {
darran	0:55a05330f8cc	460	/* IGMP_MEMB_QUERY to a specific group ? */
darran	0:55a05330f8cc	461	if (!ip_addr_isany(&igmp->igmp_group_address)) {
darran	0:55a05330f8cc	462	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
darran	0:55a05330f8cc	463	ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
darran	0:55a05330f8cc	464	if (ip_addr_cmp(dest, &allsystems)) {
darran	0:55a05330f8cc	465	LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
darran	0:55a05330f8cc	466	/* we first need to re-lookfor the group since we used dest last time */
darran	0:55a05330f8cc	467	group = igmp_lookfor_group(inp, &igmp->igmp_group_address);
darran	0:55a05330f8cc	468	} else {
darran	0:55a05330f8cc	469	LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
darran	0:55a05330f8cc	470	}
darran	0:55a05330f8cc	471
darran	0:55a05330f8cc	472	if (group != NULL) {
darran	0:55a05330f8cc	473	IGMP_STATS_INC(igmp.rx_group);
darran	0:55a05330f8cc	474	igmp_delaying_member(group, igmp->igmp_maxresp);
darran	0:55a05330f8cc	475	}
darran	0:55a05330f8cc	476	else {
darran	0:55a05330f8cc	477	IGMP_STATS_INC(igmp.drop);
darran	0:55a05330f8cc	478	}
darran	0:55a05330f8cc	479	}
darran	0:55a05330f8cc	480	else {
darran	0:55a05330f8cc	481	IGMP_STATS_INC(igmp.proterr);
darran	0:55a05330f8cc	482	}
darran	0:55a05330f8cc	483	}
darran	0:55a05330f8cc	484	break;
darran	0:55a05330f8cc	485	}
darran	0:55a05330f8cc	486	case IGMP_V2_MEMB_REPORT: {
darran	0:55a05330f8cc	487	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
darran	0:55a05330f8cc	488	IGMP_STATS_INC(igmp.rx_report);
darran	0:55a05330f8cc	489	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
darran	0:55a05330f8cc	490	/* This is on a specific group we have already looked up */
darran	0:55a05330f8cc	491	group->timer = 0; /* stopped */
darran	0:55a05330f8cc	492	group->group_state = IGMP_GROUP_IDLE_MEMBER;
darran	0:55a05330f8cc	493	group->last_reporter_flag = 0;
darran	0:55a05330f8cc	494	}
darran	0:55a05330f8cc	495	break;
darran	0:55a05330f8cc	496	}
darran	0:55a05330f8cc	497	default: {
darran	0:55a05330f8cc	498	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
darran	0:55a05330f8cc	499	igmp->igmp_msgtype, group->group_state, &group, group->netif));
darran	0:55a05330f8cc	500	IGMP_STATS_INC(igmp.proterr);
darran	0:55a05330f8cc	501	break;
darran	0:55a05330f8cc	502	}
darran	0:55a05330f8cc	503	}
darran	0:55a05330f8cc	504
darran	0:55a05330f8cc	505	pbuf_free(p);
darran	0:55a05330f8cc	506	return;
darran	0:55a05330f8cc	507	}
darran	0:55a05330f8cc	508
darran	0:55a05330f8cc	509	/**
darran	0:55a05330f8cc	510	* Join a group on one network interface.
darran	0:55a05330f8cc	511	*
darran	0:55a05330f8cc	512	* @param ifaddr ip address of the network interface which should join a new group
darran	0:55a05330f8cc	513	* @param groupaddr the ip address of the group which to join
darran	0:55a05330f8cc	514	* @return ERR_OK if group was joined on the netif(s), an err_t otherwise
darran	0:55a05330f8cc	515	*/
darran	0:55a05330f8cc	516	err_t
darran	0:55a05330f8cc	517	igmp_joingroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
darran	0:55a05330f8cc	518	{
darran	0:55a05330f8cc	519	err_t err = ERR_VAL; /* no matching interface */
darran	0:55a05330f8cc	520	struct igmp_group *group;
darran	0:55a05330f8cc	521	struct netif *netif;
darran	0:55a05330f8cc	522
darran	0:55a05330f8cc	523	/* make sure it is multicast address */
darran	0:55a05330f8cc	524	LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
darran	0:55a05330f8cc	525	LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
darran	0:55a05330f8cc	526
darran	0:55a05330f8cc	527	/* loop through netif's */
darran	0:55a05330f8cc	528	netif = netif_list;
darran	0:55a05330f8cc	529	while (netif != NULL) {
darran	0:55a05330f8cc	530	/* Should we join this interface ? */
darran	0:55a05330f8cc	531	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
darran	0:55a05330f8cc	532	/* find group or create a new one if not found */
darran	0:55a05330f8cc	533	group = igmp_lookup_group(netif, groupaddr);
darran	0:55a05330f8cc	534
darran	0:55a05330f8cc	535	if (group != NULL) {
darran	0:55a05330f8cc	536	/* This should create a new group, check the state to make sure */
darran	0:55a05330f8cc	537	if (group->group_state != IGMP_GROUP_NON_MEMBER) {
darran	0:55a05330f8cc	538	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
darran	0:55a05330f8cc	539	} else {
darran	0:55a05330f8cc	540	/* OK - it was new group */
darran	0:55a05330f8cc	541	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
darran	0:55a05330f8cc	542	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
darran	0:55a05330f8cc	543	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
darran	0:55a05330f8cc	544
darran	0:55a05330f8cc	545	/* If first use of the group, allow the group at the MAC level */
darran	0:55a05330f8cc	546	if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
darran	0:55a05330f8cc	547	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
darran	0:55a05330f8cc	548	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
darran	0:55a05330f8cc	549	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
darran	0:55a05330f8cc	550	netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
darran	0:55a05330f8cc	551	}
darran	0:55a05330f8cc	552
darran	0:55a05330f8cc	553	IGMP_STATS_INC(igmp.tx_join);
darran	0:55a05330f8cc	554	igmp_send(group, IGMP_V2_MEMB_REPORT);
darran	0:55a05330f8cc	555
darran	0:55a05330f8cc	556	igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
darran	0:55a05330f8cc	557
darran	0:55a05330f8cc	558	/* Need to work out where this timer comes from */
darran	0:55a05330f8cc	559	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
darran	0:55a05330f8cc	560	}
darran	0:55a05330f8cc	561	/* Increment group use */
darran	0:55a05330f8cc	562	group->use++;
darran	0:55a05330f8cc	563	/* Join on this interface */
darran	0:55a05330f8cc	564	err = ERR_OK;
darran	0:55a05330f8cc	565	} else {
darran	0:55a05330f8cc	566	/* Return an error even if some network interfaces are joined */
darran	0:55a05330f8cc	567	/** @todo undo any other netif already joined */
darran	0:55a05330f8cc	568	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
darran	0:55a05330f8cc	569	return ERR_MEM;
darran	0:55a05330f8cc	570	}
darran	0:55a05330f8cc	571	}
darran	0:55a05330f8cc	572	/* proceed to next network interface */
darran	0:55a05330f8cc	573	netif = netif->next;
darran	0:55a05330f8cc	574	}
darran	0:55a05330f8cc	575
darran	0:55a05330f8cc	576	return err;
darran	0:55a05330f8cc	577	}
darran	0:55a05330f8cc	578
darran	0:55a05330f8cc	579	/**
darran	0:55a05330f8cc	580	* Leave a group on one network interface.
darran	0:55a05330f8cc	581	*
darran	0:55a05330f8cc	582	* @param ifaddr ip address of the network interface which should leave a group
darran	0:55a05330f8cc	583	* @param groupaddr the ip address of the group which to leave
darran	0:55a05330f8cc	584	* @return ERR_OK if group was left on the netif(s), an err_t otherwise
darran	0:55a05330f8cc	585	*/
darran	0:55a05330f8cc	586	err_t
darran	0:55a05330f8cc	587	igmp_leavegroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
darran	0:55a05330f8cc	588	{
darran	0:55a05330f8cc	589	err_t err = ERR_VAL; /* no matching interface */
darran	0:55a05330f8cc	590	struct igmp_group *group;
darran	0:55a05330f8cc	591	struct netif *netif;
darran	0:55a05330f8cc	592
darran	0:55a05330f8cc	593	/* make sure it is multicast address */
darran	0:55a05330f8cc	594	LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
darran	0:55a05330f8cc	595	LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
darran	0:55a05330f8cc	596
darran	0:55a05330f8cc	597	/* loop through netif's */
darran	0:55a05330f8cc	598	netif = netif_list;
darran	0:55a05330f8cc	599	while (netif != NULL) {
darran	0:55a05330f8cc	600	/* Should we leave this interface ? */
darran	0:55a05330f8cc	601	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
darran	0:55a05330f8cc	602	/* find group */
darran	0:55a05330f8cc	603	group = igmp_lookfor_group(netif, groupaddr);
darran	0:55a05330f8cc	604
darran	0:55a05330f8cc	605	if (group != NULL) {
darran	0:55a05330f8cc	606	/* Only send a leave if the flag is set according to the state diagram */
darran	0:55a05330f8cc	607	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
darran	0:55a05330f8cc	608	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
darran	0:55a05330f8cc	609	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
darran	0:55a05330f8cc	610
darran	0:55a05330f8cc	611	/* If there is no other use of the group */
darran	0:55a05330f8cc	612	if (group->use <= 1) {
darran	0:55a05330f8cc	613	/* If we are the last reporter for this group */
darran	0:55a05330f8cc	614	if (group->last_reporter_flag) {
darran	0:55a05330f8cc	615	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
darran	0:55a05330f8cc	616	IGMP_STATS_INC(igmp.tx_leave);
darran	0:55a05330f8cc	617	igmp_send(group, IGMP_LEAVE_GROUP);
darran	0:55a05330f8cc	618	}
darran	0:55a05330f8cc	619
darran	0:55a05330f8cc	620	/* Disable the group at the MAC level */
darran	0:55a05330f8cc	621	if (netif->igmp_mac_filter != NULL) {
darran	0:55a05330f8cc	622	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
darran	0:55a05330f8cc	623	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
darran	0:55a05330f8cc	624	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
darran	0:55a05330f8cc	625	netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
darran	0:55a05330f8cc	626	}
darran	0:55a05330f8cc	627
darran	0:55a05330f8cc	628	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
darran	0:55a05330f8cc	629	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
darran	0:55a05330f8cc	630	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
darran	0:55a05330f8cc	631
darran	0:55a05330f8cc	632	/* Free the group */
darran	0:55a05330f8cc	633	igmp_remove_group(group);
darran	0:55a05330f8cc	634	} else {
darran	0:55a05330f8cc	635	/* Decrement group use */
darran	0:55a05330f8cc	636	group->use--;
darran	0:55a05330f8cc	637	}
darran	0:55a05330f8cc	638	/* Leave on this interface */
darran	0:55a05330f8cc	639	err = ERR_OK;
darran	0:55a05330f8cc	640	} else {
darran	0:55a05330f8cc	641	/* It's not a fatal error on "leavegroup" */
darran	0:55a05330f8cc	642	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
darran	0:55a05330f8cc	643	}
darran	0:55a05330f8cc	644	}
darran	0:55a05330f8cc	645	/* proceed to next network interface */
darran	0:55a05330f8cc	646	netif = netif->next;
darran	0:55a05330f8cc	647	}
darran	0:55a05330f8cc	648
darran	0:55a05330f8cc	649	return err;
darran	0:55a05330f8cc	650	}
darran	0:55a05330f8cc	651
darran	0:55a05330f8cc	652	/**
darran	0:55a05330f8cc	653	* The igmp timer function (both for NO_SYS=1 and =0)
darran	0:55a05330f8cc	654	* Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
darran	0:55a05330f8cc	655	*/
darran	0:55a05330f8cc	656	void
darran	0:55a05330f8cc	657	igmp_tmr(void)
darran	0:55a05330f8cc	658	{
darran	0:55a05330f8cc	659	struct igmp_group *group = igmp_group_list;
darran	0:55a05330f8cc	660
darran	0:55a05330f8cc	661	while (group != NULL) {
darran	0:55a05330f8cc	662	if (group->timer > 0) {
darran	0:55a05330f8cc	663	group->timer--;
darran	0:55a05330f8cc	664	if (group->timer == 0) {
darran	0:55a05330f8cc	665	igmp_timeout(group);
darran	0:55a05330f8cc	666	}
darran	0:55a05330f8cc	667	}
darran	0:55a05330f8cc	668	group = group->next;
darran	0:55a05330f8cc	669	}
darran	0:55a05330f8cc	670	}
darran	0:55a05330f8cc	671
darran	0:55a05330f8cc	672	/**
darran	0:55a05330f8cc	673	* Called if a timeout for one group is reached.
darran	0:55a05330f8cc	674	* Sends a report for this group.
darran	0:55a05330f8cc	675	*
darran	0:55a05330f8cc	676	* @param group an igmp_group for which a timeout is reached
darran	0:55a05330f8cc	677	*/
darran	0:55a05330f8cc	678	static void
darran	0:55a05330f8cc	679	igmp_timeout(struct igmp_group *group)
darran	0:55a05330f8cc	680	{
darran	0:55a05330f8cc	681	/* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
darran	0:55a05330f8cc	682	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
darran	0:55a05330f8cc	683	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
darran	0:55a05330f8cc	684	ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
darran	0:55a05330f8cc	685	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
darran	0:55a05330f8cc	686
darran	0:55a05330f8cc	687	IGMP_STATS_INC(igmp.tx_report);
darran	0:55a05330f8cc	688	igmp_send(group, IGMP_V2_MEMB_REPORT);
darran	0:55a05330f8cc	689	}
darran	0:55a05330f8cc	690	}
darran	0:55a05330f8cc	691
darran	0:55a05330f8cc	692	/**
darran	0:55a05330f8cc	693	* Start a timer for an igmp group
darran	0:55a05330f8cc	694	*
darran	0:55a05330f8cc	695	* @param group the igmp_group for which to start a timer
darran	0:55a05330f8cc	696	* @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
darran	0:55a05330f8cc	697	* every call to igmp_tmr())
darran	0:55a05330f8cc	698	*/
darran	0:55a05330f8cc	699	static void
darran	0:55a05330f8cc	700	igmp_start_timer(struct igmp_group *group, u8_t max_time)
darran	0:55a05330f8cc	701	{
darran	0:55a05330f8cc	702	/* ensure the input value is > 0 */
darran	0:55a05330f8cc	703	if (max_time == 0) {
darran	0:55a05330f8cc	704	max_time = 1;
darran	0:55a05330f8cc	705	}
darran	0:55a05330f8cc	706	/* ensure the random value is > 0 */
darran	0:55a05330f8cc	707	group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
darran	0:55a05330f8cc	708	}
darran	0:55a05330f8cc	709
darran	0:55a05330f8cc	710	/**
darran	0:55a05330f8cc	711	* Stop a timer for an igmp_group
darran	0:55a05330f8cc	712	*
darran	0:55a05330f8cc	713	* @param group the igmp_group for which to stop the timer
darran	0:55a05330f8cc	714	*/
darran	0:55a05330f8cc	715	static void
darran	0:55a05330f8cc	716	igmp_stop_timer(struct igmp_group *group)
darran	0:55a05330f8cc	717	{
darran	0:55a05330f8cc	718	group->timer = 0;
darran	0:55a05330f8cc	719	}
darran	0:55a05330f8cc	720
darran	0:55a05330f8cc	721	/**
darran	0:55a05330f8cc	722	* Delaying membership report for a group if necessary
darran	0:55a05330f8cc	723	*
darran	0:55a05330f8cc	724	* @param group the igmp_group for which "delaying" membership report
darran	0:55a05330f8cc	725	* @param maxresp query delay
darran	0:55a05330f8cc	726	*/
darran	0:55a05330f8cc	727	static void
darran	0:55a05330f8cc	728	igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
darran	0:55a05330f8cc	729	{
darran	0:55a05330f8cc	730	if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) \|\|
darran	0:55a05330f8cc	731	((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
darran	0:55a05330f8cc	732	((group->timer == 0) \|\| (maxresp < group->timer)))) {
darran	0:55a05330f8cc	733	igmp_start_timer(group, maxresp);
darran	0:55a05330f8cc	734	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
darran	0:55a05330f8cc	735	}
darran	0:55a05330f8cc	736	}
darran	0:55a05330f8cc	737
darran	0:55a05330f8cc	738
darran	0:55a05330f8cc	739	/**
darran	0:55a05330f8cc	740	* Sends an IP packet on a network interface. This function constructs the IP header
darran	0:55a05330f8cc	741	* and calculates the IP header checksum. If the source IP address is NULL,
darran	0:55a05330f8cc	742	* the IP address of the outgoing network interface is filled in as source address.
darran	0:55a05330f8cc	743	*
darran	0:55a05330f8cc	744	* @param p the packet to send (p->payload points to the data, e.g. next
darran	0:55a05330f8cc	745	protocol header; if dest == IP_HDRINCL, p already includes an IP
darran	0:55a05330f8cc	746	header and p->payload points to that IP header)
darran	0:55a05330f8cc	747	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
darran	0:55a05330f8cc	748	* IP address of the netif used to send is used as source address)
darran	0:55a05330f8cc	749	* @param dest the destination IP address to send the packet to
darran	0:55a05330f8cc	750	* @param ttl the TTL value to be set in the IP header
darran	0:55a05330f8cc	751	* @param proto the PROTOCOL to be set in the IP header
darran	0:55a05330f8cc	752	* @param netif the netif on which to send this packet
darran	0:55a05330f8cc	753	* @return ERR_OK if the packet was sent OK
darran	0:55a05330f8cc	754	* ERR_BUF if p doesn't have enough space for IP/LINK headers
darran	0:55a05330f8cc	755	* returns errors returned by netif->output
darran	0:55a05330f8cc	756	*/
darran	0:55a05330f8cc	757	static err_t
darran	0:55a05330f8cc	758	igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif)
darran	0:55a05330f8cc	759	{
darran	0:55a05330f8cc	760	/* This is the "router alert" option */
darran	0:55a05330f8cc	761	u16_t ra[2];
darran	0:55a05330f8cc	762	ra[0] = htons(ROUTER_ALERT);
darran	0:55a05330f8cc	763	ra[1] = 0x0000; /* Router shall examine packet */
darran	0:55a05330f8cc	764	IGMP_STATS_INC(igmp.xmit);
darran	0:55a05330f8cc	765	return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
darran	0:55a05330f8cc	766	}
darran	0:55a05330f8cc	767
darran	0:55a05330f8cc	768	/**
darran	0:55a05330f8cc	769	* Send an igmp packet to a specific group.
darran	0:55a05330f8cc	770	*
darran	0:55a05330f8cc	771	* @param group the group to which to send the packet
darran	0:55a05330f8cc	772	* @param type the type of igmp packet to send
darran	0:55a05330f8cc	773	*/
darran	0:55a05330f8cc	774	static void
darran	0:55a05330f8cc	775	igmp_send(struct igmp_group *group, u8_t type)
darran	0:55a05330f8cc	776	{
darran	0:55a05330f8cc	777	struct pbuf* p = NULL;
darran	0:55a05330f8cc	778	struct igmp_msg* igmp = NULL;
darran	0:55a05330f8cc	779	ip_addr_t src = *IP_ADDR_ANY;
darran	0:55a05330f8cc	780	ip_addr_t* dest = NULL;
darran	0:55a05330f8cc	781
darran	0:55a05330f8cc	782	/* IP header + "router alert" option + IGMP header */
darran	0:55a05330f8cc	783	p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
darran	0:55a05330f8cc	784
darran	0:55a05330f8cc	785	if (p) {
darran	0:55a05330f8cc	786	igmp = p->payload;
darran	0:55a05330f8cc	787	LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
darran	0:55a05330f8cc	788	(p->len >= sizeof(struct igmp_msg)));
darran	0:55a05330f8cc	789	ip_addr_copy(src, group->netif->ip_addr);
darran	0:55a05330f8cc	790
darran	0:55a05330f8cc	791	if (type == IGMP_V2_MEMB_REPORT) {
darran	0:55a05330f8cc	792	dest = &(group->group_address);
darran	0:55a05330f8cc	793	ip_addr_copy(igmp->igmp_group_address, group->group_address);
darran	0:55a05330f8cc	794	group->last_reporter_flag = 1; /* Remember we were the last to report */
darran	0:55a05330f8cc	795	} else {
darran	0:55a05330f8cc	796	if (type == IGMP_LEAVE_GROUP) {
darran	0:55a05330f8cc	797	dest = &allrouters;
darran	0:55a05330f8cc	798	ip_addr_copy(igmp->igmp_group_address, group->group_address);
darran	0:55a05330f8cc	799	}
darran	0:55a05330f8cc	800	}
darran	0:55a05330f8cc	801
darran	0:55a05330f8cc	802	if ((type == IGMP_V2_MEMB_REPORT) \|\| (type == IGMP_LEAVE_GROUP)) {
darran	0:55a05330f8cc	803	igmp->igmp_msgtype = type;
darran	0:55a05330f8cc	804	igmp->igmp_maxresp = 0;
darran	0:55a05330f8cc	805	igmp->igmp_checksum = 0;
darran	0:55a05330f8cc	806	igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
darran	0:55a05330f8cc	807
darran	0:55a05330f8cc	808	igmp_ip_output_if(p, &src, dest, group->netif);
darran	0:55a05330f8cc	809	}
darran	0:55a05330f8cc	810
darran	0:55a05330f8cc	811	pbuf_free(p);
darran	0:55a05330f8cc	812	} else {
darran	0:55a05330f8cc	813	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
darran	0:55a05330f8cc	814	IGMP_STATS_INC(igmp.memerr);
darran	0:55a05330f8cc	815	}
darran	0:55a05330f8cc	816	}
darran	0:55a05330f8cc	817
darran	0:55a05330f8cc	818	#endif /* LWIP_IGMP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	18 Jun 2010
Imports:	7
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	1

lwip/core/ipv4/igmp.c@1:4218cacaf696, 2010-06-18 (annotated)

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