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Jesper Taxbøl / Mbed 2 deprecated TCPSpeedTest

I have a problem getting this to work. Server only recieves half of the data being sent. Whats wrong

lwip/core/ipv4/igmp.c@0:66300c77c6e9, 2011-03-29 (annotated)

Committer:: tax
Date:: Tue Mar 29 13:20:15 2011 +0000
Revision:: 0:66300c77c6e9

Who changed what in which revision?

User	Revision	Line number	New contents of line
tax	0:66300c77c6e9	1	/**
tax	0:66300c77c6e9	2	* @file
tax	0:66300c77c6e9	3	* IGMP - Internet Group Management Protocol
tax	0:66300c77c6e9	4	*
tax	0:66300c77c6e9	5	*/
tax	0:66300c77c6e9	6
tax	0:66300c77c6e9	7	/*
tax	0:66300c77c6e9	8	* Copyright (c) 2002 CITEL Technologies Ltd.
tax	0:66300c77c6e9	9	* All rights reserved.
tax	0:66300c77c6e9	10	*
tax	0:66300c77c6e9	11	* Redistribution and use in source and binary forms, with or without
tax	0:66300c77c6e9	12	* modification, are permitted provided that the following conditions
tax	0:66300c77c6e9	13	* are met:
tax	0:66300c77c6e9	14	* 1. Redistributions of source code must retain the above copyright
tax	0:66300c77c6e9	15	* notice, this list of conditions and the following disclaimer.
tax	0:66300c77c6e9	16	* 2. Redistributions in binary form must reproduce the above copyright
tax	0:66300c77c6e9	17	* notice, this list of conditions and the following disclaimer in the
tax	0:66300c77c6e9	18	* documentation and/or other materials provided with the distribution.
tax	0:66300c77c6e9	19	* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
tax	0:66300c77c6e9	20	* may be used to endorse or promote products derived from this software
tax	0:66300c77c6e9	21	* without specific prior written permission.
tax	0:66300c77c6e9	22	*
tax	0:66300c77c6e9	23	* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
tax	0:66300c77c6e9	24	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
tax	0:66300c77c6e9	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
tax	0:66300c77c6e9	26	* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
tax	0:66300c77c6e9	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
tax	0:66300c77c6e9	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
tax	0:66300c77c6e9	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
tax	0:66300c77c6e9	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
tax	0:66300c77c6e9	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
tax	0:66300c77c6e9	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
tax	0:66300c77c6e9	33	* SUCH DAMAGE.
tax	0:66300c77c6e9	34	*
tax	0:66300c77c6e9	35	* This file is a contribution to the lwIP TCP/IP stack.
tax	0:66300c77c6e9	36	* The Swedish Institute of Computer Science and Adam Dunkels
tax	0:66300c77c6e9	37	* are specifically granted permission to redistribute this
tax	0:66300c77c6e9	38	* source code.
tax	0:66300c77c6e9	39	*/
tax	0:66300c77c6e9	40
tax	0:66300c77c6e9	41	/*-------------------------------------------------------------
tax	0:66300c77c6e9	42	Note 1)
tax	0:66300c77c6e9	43	Although the rfc requires V1 AND V2 capability
tax	0:66300c77c6e9	44	we will only support v2 since now V1 is very old (August 1989)
tax	0:66300c77c6e9	45	V1 can be added if required
tax	0:66300c77c6e9	46
tax	0:66300c77c6e9	47	a debug print and statistic have been implemented to
tax	0:66300c77c6e9	48	show this up.
tax	0:66300c77c6e9	49	-------------------------------------------------------------
tax	0:66300c77c6e9	50	-------------------------------------------------------------
tax	0:66300c77c6e9	51	Note 2)
tax	0:66300c77c6e9	52	A query for a specific group address (as opposed to ALLHOSTS)
tax	0:66300c77c6e9	53	has now been implemented as I am unsure if it is required
tax	0:66300c77c6e9	54
tax	0:66300c77c6e9	55	a debug print and statistic have been implemented to
tax	0:66300c77c6e9	56	show this up.
tax	0:66300c77c6e9	57	-------------------------------------------------------------
tax	0:66300c77c6e9	58	-------------------------------------------------------------
tax	0:66300c77c6e9	59	Note 3)
tax	0:66300c77c6e9	60	The router alert rfc 2113 is implemented in outgoing packets
tax	0:66300c77c6e9	61	but not checked rigorously incoming
tax	0:66300c77c6e9	62	-------------------------------------------------------------
tax	0:66300c77c6e9	63	Steve Reynolds
tax	0:66300c77c6e9	64	------------------------------------------------------------*/
tax	0:66300c77c6e9	65
tax	0:66300c77c6e9	66	/*-----------------------------------------------------------------------------
tax	0:66300c77c6e9	67	* RFC 988 - Host extensions for IP multicasting - V0
tax	0:66300c77c6e9	68	* RFC 1054 - Host extensions for IP multicasting -
tax	0:66300c77c6e9	69	* RFC 1112 - Host extensions for IP multicasting - V1
tax	0:66300c77c6e9	70	* RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
tax	0:66300c77c6e9	71	* RFC 3376 - Internet Group Management Protocol, Version 3 - V3
tax	0:66300c77c6e9	72	* RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
tax	0:66300c77c6e9	73	* RFC 2113 - IP Router Alert Option -
tax	0:66300c77c6e9	74	----------------------------------------------------------------------------/
tax	0:66300c77c6e9	75
tax	0:66300c77c6e9	76	/*-----------------------------------------------------------------------------
tax	0:66300c77c6e9	77	* Includes
tax	0:66300c77c6e9	78	----------------------------------------------------------------------------/
tax	0:66300c77c6e9	79
tax	0:66300c77c6e9	80	#include "lwip/opt.h"
tax	0:66300c77c6e9	81
tax	0:66300c77c6e9	82	#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
tax	0:66300c77c6e9	83
tax	0:66300c77c6e9	84	#include "lwip/igmp.h"
tax	0:66300c77c6e9	85	#include "lwip/debug.h"
tax	0:66300c77c6e9	86	#include "lwip/def.h"
tax	0:66300c77c6e9	87	#include "lwip/mem.h"
tax	0:66300c77c6e9	88	#include "lwip/ip.h"
tax	0:66300c77c6e9	89	#include "lwip/inet_chksum.h"
tax	0:66300c77c6e9	90	#include "lwip/netif.h"
tax	0:66300c77c6e9	91	#include "lwip/icmp.h"
tax	0:66300c77c6e9	92	#include "lwip/udp.h"
tax	0:66300c77c6e9	93	#include "lwip/tcp.h"
tax	0:66300c77c6e9	94	#include "lwip/stats.h"
tax	0:66300c77c6e9	95
tax	0:66300c77c6e9	96	#include "string.h"
tax	0:66300c77c6e9	97
tax	0:66300c77c6e9	98	/*
tax	0:66300c77c6e9	99	* IGMP constants
tax	0:66300c77c6e9	100	*/
tax	0:66300c77c6e9	101	#define IGMP_TTL 1
tax	0:66300c77c6e9	102	#define IGMP_MINLEN 8
tax	0:66300c77c6e9	103	#define ROUTER_ALERT 0x9404
tax	0:66300c77c6e9	104	#define ROUTER_ALERTLEN 4
tax	0:66300c77c6e9	105
tax	0:66300c77c6e9	106	/*
tax	0:66300c77c6e9	107	* IGMP message types, including version number.
tax	0:66300c77c6e9	108	*/
tax	0:66300c77c6e9	109	#define IGMP_MEMB_QUERY 0x11 /* Membership query */
tax	0:66300c77c6e9	110	#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
tax	0:66300c77c6e9	111	#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
tax	0:66300c77c6e9	112	#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
tax	0:66300c77c6e9	113
tax	0:66300c77c6e9	114	/* Group membership states */
tax	0:66300c77c6e9	115	#define IGMP_GROUP_NON_MEMBER 0
tax	0:66300c77c6e9	116	#define IGMP_GROUP_DELAYING_MEMBER 1
tax	0:66300c77c6e9	117	#define IGMP_GROUP_IDLE_MEMBER 2
tax	0:66300c77c6e9	118
tax	0:66300c77c6e9	119	/**
tax	0:66300c77c6e9	120	* IGMP packet format.
tax	0:66300c77c6e9	121	*/
tax	0:66300c77c6e9	122	#ifdef PACK_STRUCT_USE_INCLUDES
tax	0:66300c77c6e9	123	# include "arch/bpstruct.h"
tax	0:66300c77c6e9	124	#endif
tax	0:66300c77c6e9	125	PACK_STRUCT_BEGIN
tax	0:66300c77c6e9	126	struct igmp_msg {
tax	0:66300c77c6e9	127	PACK_STRUCT_FIELD(u8_t igmp_msgtype);
tax	0:66300c77c6e9	128	PACK_STRUCT_FIELD(u8_t igmp_maxresp);
tax	0:66300c77c6e9	129	PACK_STRUCT_FIELD(u16_t igmp_checksum);
tax	0:66300c77c6e9	130	PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
tax	0:66300c77c6e9	131	} PACK_STRUCT_STRUCT;
tax	0:66300c77c6e9	132	PACK_STRUCT_END
tax	0:66300c77c6e9	133	#ifdef PACK_STRUCT_USE_INCLUDES
tax	0:66300c77c6e9	134	# include "arch/epstruct.h"
tax	0:66300c77c6e9	135	#endif
tax	0:66300c77c6e9	136
tax	0:66300c77c6e9	137
tax	0:66300c77c6e9	138	static struct igmp_group igmp_lookup_group(struct netif ifp, ip_addr_t *addr);
tax	0:66300c77c6e9	139	static err_t igmp_remove_group(struct igmp_group *group);
tax	0:66300c77c6e9	140	static void igmp_timeout( struct igmp_group *group);
tax	0:66300c77c6e9	141	static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
tax	0:66300c77c6e9	142	static void igmp_stop_timer(struct igmp_group *group);
tax	0:66300c77c6e9	143	static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
tax	0:66300c77c6e9	144	static err_t igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif);
tax	0:66300c77c6e9	145	static void igmp_send(struct igmp_group *group, u8_t type);
tax	0:66300c77c6e9	146
tax	0:66300c77c6e9	147
tax	0:66300c77c6e9	148	static struct igmp_group* igmp_group_list;
tax	0:66300c77c6e9	149	static ip_addr_t allsystems;
tax	0:66300c77c6e9	150	static ip_addr_t allrouters;
tax	0:66300c77c6e9	151
tax	0:66300c77c6e9	152
tax	0:66300c77c6e9	153	/**
tax	0:66300c77c6e9	154	* Initialize the IGMP module
tax	0:66300c77c6e9	155	*/
tax	0:66300c77c6e9	156	void
tax	0:66300c77c6e9	157	igmp_init(void)
tax	0:66300c77c6e9	158	{
tax	0:66300c77c6e9	159	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
tax	0:66300c77c6e9	160
tax	0:66300c77c6e9	161	IP4_ADDR(&allsystems, 224, 0, 0, 1);
tax	0:66300c77c6e9	162	IP4_ADDR(&allrouters, 224, 0, 0, 2);
tax	0:66300c77c6e9	163	}
tax	0:66300c77c6e9	164
tax	0:66300c77c6e9	165	#ifdef LWIP_DEBUG
tax	0:66300c77c6e9	166	/**
tax	0:66300c77c6e9	167	* Dump global IGMP groups list
tax	0:66300c77c6e9	168	*/
tax	0:66300c77c6e9	169	void
tax	0:66300c77c6e9	170	igmp_dump_group_list()
tax	0:66300c77c6e9	171	{
tax	0:66300c77c6e9	172	struct igmp_group *group = igmp_group_list;
tax	0:66300c77c6e9	173
tax	0:66300c77c6e9	174	while (group != NULL) {
tax	0:66300c77c6e9	175	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
tax	0:66300c77c6e9	176	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
tax	0:66300c77c6e9	177	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
tax	0:66300c77c6e9	178	group = group->next;
tax	0:66300c77c6e9	179	}
tax	0:66300c77c6e9	180	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
tax	0:66300c77c6e9	181	}
tax	0:66300c77c6e9	182	#else
tax	0:66300c77c6e9	183	#define igmp_dump_group_list()
tax	0:66300c77c6e9	184	#endif /* LWIP_DEBUG */
tax	0:66300c77c6e9	185
tax	0:66300c77c6e9	186	/**
tax	0:66300c77c6e9	187	* Start IGMP processing on interface
tax	0:66300c77c6e9	188	*
tax	0:66300c77c6e9	189	* @param netif network interface on which start IGMP processing
tax	0:66300c77c6e9	190	*/
tax	0:66300c77c6e9	191	err_t
tax	0:66300c77c6e9	192	igmp_start(struct netif *netif)
tax	0:66300c77c6e9	193	{
tax	0:66300c77c6e9	194	struct igmp_group* group;
tax	0:66300c77c6e9	195
tax	0:66300c77c6e9	196	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
tax	0:66300c77c6e9	197
tax	0:66300c77c6e9	198	group = igmp_lookup_group(netif, &allsystems);
tax	0:66300c77c6e9	199
tax	0:66300c77c6e9	200	if (group != NULL) {
tax	0:66300c77c6e9	201	group->group_state = IGMP_GROUP_IDLE_MEMBER;
tax	0:66300c77c6e9	202	group->use++;
tax	0:66300c77c6e9	203
tax	0:66300c77c6e9	204	/* Allow the igmp messages at the MAC level */
tax	0:66300c77c6e9	205	if (netif->igmp_mac_filter != NULL) {
tax	0:66300c77c6e9	206	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
tax	0:66300c77c6e9	207	ip_addr_debug_print(IGMP_DEBUG, &allsystems);
tax	0:66300c77c6e9	208	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
tax	0:66300c77c6e9	209	netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
tax	0:66300c77c6e9	210	}
tax	0:66300c77c6e9	211
tax	0:66300c77c6e9	212	return ERR_OK;
tax	0:66300c77c6e9	213	}
tax	0:66300c77c6e9	214
tax	0:66300c77c6e9	215	return ERR_MEM;
tax	0:66300c77c6e9	216	}
tax	0:66300c77c6e9	217
tax	0:66300c77c6e9	218	/**
tax	0:66300c77c6e9	219	* Stop IGMP processing on interface
tax	0:66300c77c6e9	220	*
tax	0:66300c77c6e9	221	* @param netif network interface on which stop IGMP processing
tax	0:66300c77c6e9	222	*/
tax	0:66300c77c6e9	223	err_t
tax	0:66300c77c6e9	224	igmp_stop(struct netif *netif)
tax	0:66300c77c6e9	225	{
tax	0:66300c77c6e9	226	struct igmp_group *group = igmp_group_list;
tax	0:66300c77c6e9	227	struct igmp_group *prev = NULL;
tax	0:66300c77c6e9	228	struct igmp_group *next;
tax	0:66300c77c6e9	229
tax	0:66300c77c6e9	230	/* look for groups joined on this interface further down the list */
tax	0:66300c77c6e9	231	while (group != NULL) {
tax	0:66300c77c6e9	232	next = group->next;
tax	0:66300c77c6e9	233	/* is it a group joined on this interface? */
tax	0:66300c77c6e9	234	if (group->netif == netif) {
tax	0:66300c77c6e9	235	/* is it the first group of the list? */
tax	0:66300c77c6e9	236	if (group == igmp_group_list) {
tax	0:66300c77c6e9	237	igmp_group_list = next;
tax	0:66300c77c6e9	238	}
tax	0:66300c77c6e9	239	/* is there a "previous" group defined? */
tax	0:66300c77c6e9	240	if (prev != NULL) {
tax	0:66300c77c6e9	241	prev->next = next;
tax	0:66300c77c6e9	242	}
tax	0:66300c77c6e9	243	/* disable the group at the MAC level */
tax	0:66300c77c6e9	244	if (netif->igmp_mac_filter != NULL) {
tax	0:66300c77c6e9	245	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
tax	0:66300c77c6e9	246	ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
tax	0:66300c77c6e9	247	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
tax	0:66300c77c6e9	248	netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
tax	0:66300c77c6e9	249	}
tax	0:66300c77c6e9	250	/* free group */
tax	0:66300c77c6e9	251	memp_free(MEMP_IGMP_GROUP, group);
tax	0:66300c77c6e9	252	} else {
tax	0:66300c77c6e9	253	/* change the "previous" */
tax	0:66300c77c6e9	254	prev = group;
tax	0:66300c77c6e9	255	}
tax	0:66300c77c6e9	256	/* move to "next" */
tax	0:66300c77c6e9	257	group = next;
tax	0:66300c77c6e9	258	}
tax	0:66300c77c6e9	259	return ERR_OK;
tax	0:66300c77c6e9	260	}
tax	0:66300c77c6e9	261
tax	0:66300c77c6e9	262	/**
tax	0:66300c77c6e9	263	* Report IGMP memberships for this interface
tax	0:66300c77c6e9	264	*
tax	0:66300c77c6e9	265	* @param netif network interface on which report IGMP memberships
tax	0:66300c77c6e9	266	*/
tax	0:66300c77c6e9	267	void
tax	0:66300c77c6e9	268	igmp_report_groups(struct netif *netif)
tax	0:66300c77c6e9	269	{
tax	0:66300c77c6e9	270	struct igmp_group *group = igmp_group_list;
tax	0:66300c77c6e9	271
tax	0:66300c77c6e9	272	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
tax	0:66300c77c6e9	273
tax	0:66300c77c6e9	274	while (group != NULL) {
tax	0:66300c77c6e9	275	if (group->netif == netif) {
tax	0:66300c77c6e9	276	igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
tax	0:66300c77c6e9	277	}
tax	0:66300c77c6e9	278	group = group->next;
tax	0:66300c77c6e9	279	}
tax	0:66300c77c6e9	280	}
tax	0:66300c77c6e9	281
tax	0:66300c77c6e9	282	/**
tax	0:66300c77c6e9	283	* Search for a group in the global igmp_group_list
tax	0:66300c77c6e9	284	*
tax	0:66300c77c6e9	285	* @param ifp the network interface for which to look
tax	0:66300c77c6e9	286	* @param addr the group ip address to search for
tax	0:66300c77c6e9	287	* @return a struct igmp_group* if the group has been found,
tax	0:66300c77c6e9	288	* NULL if the group wasn't found.
tax	0:66300c77c6e9	289	*/
tax	0:66300c77c6e9	290	struct igmp_group *
tax	0:66300c77c6e9	291	igmp_lookfor_group(struct netif ifp, ip_addr_t addr)
tax	0:66300c77c6e9	292	{
tax	0:66300c77c6e9	293	struct igmp_group *group = igmp_group_list;
tax	0:66300c77c6e9	294
tax	0:66300c77c6e9	295	while (group != NULL) {
tax	0:66300c77c6e9	296	if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
tax	0:66300c77c6e9	297	return group;
tax	0:66300c77c6e9	298	}
tax	0:66300c77c6e9	299	group = group->next;
tax	0:66300c77c6e9	300	}
tax	0:66300c77c6e9	301
tax	0:66300c77c6e9	302	/* to be clearer, we return NULL here instead of
tax	0:66300c77c6e9	303	* 'group' (which is also NULL at this point).
tax	0:66300c77c6e9	304	*/
tax	0:66300c77c6e9	305	return NULL;
tax	0:66300c77c6e9	306	}
tax	0:66300c77c6e9	307
tax	0:66300c77c6e9	308	/**
tax	0:66300c77c6e9	309	* Search for a specific igmp group and create a new one if not found-
tax	0:66300c77c6e9	310	*
tax	0:66300c77c6e9	311	* @param ifp the network interface for which to look
tax	0:66300c77c6e9	312	* @param addr the group ip address to search
tax	0:66300c77c6e9	313	* @return a struct igmp_group*,
tax	0:66300c77c6e9	314	* NULL on memory error.
tax	0:66300c77c6e9	315	*/
tax	0:66300c77c6e9	316	struct igmp_group *
tax	0:66300c77c6e9	317	igmp_lookup_group(struct netif ifp, ip_addr_t addr)
tax	0:66300c77c6e9	318	{
tax	0:66300c77c6e9	319	struct igmp_group *group = igmp_group_list;
tax	0:66300c77c6e9	320
tax	0:66300c77c6e9	321	/* Search if the group already exists */
tax	0:66300c77c6e9	322	group = igmp_lookfor_group(ifp, addr);
tax	0:66300c77c6e9	323	if (group != NULL) {
tax	0:66300c77c6e9	324	/* Group already exists. */
tax	0:66300c77c6e9	325	return group;
tax	0:66300c77c6e9	326	}
tax	0:66300c77c6e9	327
tax	0:66300c77c6e9	328	/* Group doesn't exist yet, create a new one */
tax	0:66300c77c6e9	329	group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
tax	0:66300c77c6e9	330	if (group != NULL) {
tax	0:66300c77c6e9	331	group->netif = ifp;
tax	0:66300c77c6e9	332	ip_addr_set(&(group->group_address), addr);
tax	0:66300c77c6e9	333	group->timer = 0; /* Not running */
tax	0:66300c77c6e9	334	group->group_state = IGMP_GROUP_NON_MEMBER;
tax	0:66300c77c6e9	335	group->last_reporter_flag = 0;
tax	0:66300c77c6e9	336	group->use = 0;
tax	0:66300c77c6e9	337	group->next = igmp_group_list;
tax	0:66300c77c6e9	338
tax	0:66300c77c6e9	339	igmp_group_list = group;
tax	0:66300c77c6e9	340	}
tax	0:66300c77c6e9	341
tax	0:66300c77c6e9	342	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
tax	0:66300c77c6e9	343	ip_addr_debug_print(IGMP_DEBUG, addr);
tax	0:66300c77c6e9	344	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
tax	0:66300c77c6e9	345
tax	0:66300c77c6e9	346	return group;
tax	0:66300c77c6e9	347	}
tax	0:66300c77c6e9	348
tax	0:66300c77c6e9	349	/**
tax	0:66300c77c6e9	350	* Remove a group in the global igmp_group_list
tax	0:66300c77c6e9	351	*
tax	0:66300c77c6e9	352	* @param group the group to remove from the global igmp_group_list
tax	0:66300c77c6e9	353	* @return ERR_OK if group was removed from the list, an err_t otherwise
tax	0:66300c77c6e9	354	*/
tax	0:66300c77c6e9	355	static err_t
tax	0:66300c77c6e9	356	igmp_remove_group(struct igmp_group *group)
tax	0:66300c77c6e9	357	{
tax	0:66300c77c6e9	358	err_t err = ERR_OK;
tax	0:66300c77c6e9	359
tax	0:66300c77c6e9	360	/* Is it the first group? */
tax	0:66300c77c6e9	361	if (igmp_group_list == group) {
tax	0:66300c77c6e9	362	igmp_group_list = group->next;
tax	0:66300c77c6e9	363	} else {
tax	0:66300c77c6e9	364	/* look for group further down the list */
tax	0:66300c77c6e9	365	struct igmp_group *tmpGroup;
tax	0:66300c77c6e9	366	for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
tax	0:66300c77c6e9	367	if (tmpGroup->next == group) {
tax	0:66300c77c6e9	368	tmpGroup->next = group->next;
tax	0:66300c77c6e9	369	break;
tax	0:66300c77c6e9	370	}
tax	0:66300c77c6e9	371	}
tax	0:66300c77c6e9	372	/* Group not found in the global igmp_group_list */
tax	0:66300c77c6e9	373	if (tmpGroup == NULL)
tax	0:66300c77c6e9	374	err = ERR_ARG;
tax	0:66300c77c6e9	375	}
tax	0:66300c77c6e9	376	/* free group */
tax	0:66300c77c6e9	377	memp_free(MEMP_IGMP_GROUP, group);
tax	0:66300c77c6e9	378
tax	0:66300c77c6e9	379	return err;
tax	0:66300c77c6e9	380	}
tax	0:66300c77c6e9	381
tax	0:66300c77c6e9	382	/**
tax	0:66300c77c6e9	383	* Called from ip_input() if a new IGMP packet is received.
tax	0:66300c77c6e9	384	*
tax	0:66300c77c6e9	385	* @param p received igmp packet, p->payload pointing to the ip header
tax	0:66300c77c6e9	386	* @param inp network interface on which the packet was received
tax	0:66300c77c6e9	387	* @param dest destination ip address of the igmp packet
tax	0:66300c77c6e9	388	*/
tax	0:66300c77c6e9	389	void
tax	0:66300c77c6e9	390	igmp_input(struct pbuf p, struct netif inp, ip_addr_t *dest)
tax	0:66300c77c6e9	391	{
tax	0:66300c77c6e9	392	struct ip_hdr * iphdr;
tax	0:66300c77c6e9	393	struct igmp_msg* igmp;
tax	0:66300c77c6e9	394	struct igmp_group* group;
tax	0:66300c77c6e9	395	struct igmp_group* groupref;
tax	0:66300c77c6e9	396
tax	0:66300c77c6e9	397	IGMP_STATS_INC(igmp.recv);
tax	0:66300c77c6e9	398
tax	0:66300c77c6e9	399	/* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
tax	0:66300c77c6e9	400	iphdr = (struct ip_hdr *)p->payload;
tax	0:66300c77c6e9	401	if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) \|\| (p->len < IGMP_MINLEN)) {
tax	0:66300c77c6e9	402	pbuf_free(p);
tax	0:66300c77c6e9	403	IGMP_STATS_INC(igmp.lenerr);
tax	0:66300c77c6e9	404	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
tax	0:66300c77c6e9	405	return;
tax	0:66300c77c6e9	406	}
tax	0:66300c77c6e9	407
tax	0:66300c77c6e9	408	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
tax	0:66300c77c6e9	409	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
tax	0:66300c77c6e9	410	LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
tax	0:66300c77c6e9	411	ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
tax	0:66300c77c6e9	412	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
tax	0:66300c77c6e9	413
tax	0:66300c77c6e9	414	/* Now calculate and check the checksum */
tax	0:66300c77c6e9	415	igmp = (struct igmp_msg *)p->payload;
tax	0:66300c77c6e9	416	if (inet_chksum(igmp, p->len)) {
tax	0:66300c77c6e9	417	pbuf_free(p);
tax	0:66300c77c6e9	418	IGMP_STATS_INC(igmp.chkerr);
tax	0:66300c77c6e9	419	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
tax	0:66300c77c6e9	420	return;
tax	0:66300c77c6e9	421	}
tax	0:66300c77c6e9	422
tax	0:66300c77c6e9	423	/* Packet is ok so find an existing group */
tax	0:66300c77c6e9	424	group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
tax	0:66300c77c6e9	425
tax	0:66300c77c6e9	426	/* If group can be found or create... */
tax	0:66300c77c6e9	427	if (!group) {
tax	0:66300c77c6e9	428	pbuf_free(p);
tax	0:66300c77c6e9	429	IGMP_STATS_INC(igmp.drop);
tax	0:66300c77c6e9	430	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
tax	0:66300c77c6e9	431	return;
tax	0:66300c77c6e9	432	}
tax	0:66300c77c6e9	433
tax	0:66300c77c6e9	434	/* NOW ACT ON THE INCOMING MESSAGE TYPE... */
tax	0:66300c77c6e9	435	switch (igmp->igmp_msgtype) {
tax	0:66300c77c6e9	436	case IGMP_MEMB_QUERY: {
tax	0:66300c77c6e9	437	/* IGMP_MEMB_QUERY to the "all systems" address ? */
tax	0:66300c77c6e9	438	if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
tax	0:66300c77c6e9	439	/* THIS IS THE GENERAL QUERY */
tax	0:66300c77c6e9	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)));
tax	0:66300c77c6e9	441
tax	0:66300c77c6e9	442	if (igmp->igmp_maxresp == 0) {
tax	0:66300c77c6e9	443	IGMP_STATS_INC(igmp.rx_v1);
tax	0:66300c77c6e9	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"));
tax	0:66300c77c6e9	445	igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
tax	0:66300c77c6e9	446	} else {
tax	0:66300c77c6e9	447	IGMP_STATS_INC(igmp.rx_general);
tax	0:66300c77c6e9	448	}
tax	0:66300c77c6e9	449
tax	0:66300c77c6e9	450	groupref = igmp_group_list;
tax	0:66300c77c6e9	451	while (groupref) {
tax	0:66300c77c6e9	452	/* Do not send messages on the all systems group address! */
tax	0:66300c77c6e9	453	if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
tax	0:66300c77c6e9	454	igmp_delaying_member(groupref, igmp->igmp_maxresp);
tax	0:66300c77c6e9	455	}
tax	0:66300c77c6e9	456	groupref = groupref->next;
tax	0:66300c77c6e9	457	}
tax	0:66300c77c6e9	458	} else {
tax	0:66300c77c6e9	459	/* IGMP_MEMB_QUERY to a specific group ? */
tax	0:66300c77c6e9	460	if (!ip_addr_isany(&igmp->igmp_group_address)) {
tax	0:66300c77c6e9	461	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
tax	0:66300c77c6e9	462	ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
tax	0:66300c77c6e9	463	if (ip_addr_cmp(dest, &allsystems)) {
tax	0:66300c77c6e9	464	ip_addr_t groupaddr;
tax	0:66300c77c6e9	465	LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
tax	0:66300c77c6e9	466	/* we first need to re-look for the group since we used dest last time */
tax	0:66300c77c6e9	467	ip_addr_copy(groupaddr, igmp->igmp_group_address);
tax	0:66300c77c6e9	468	group = igmp_lookfor_group(inp, &groupaddr);
tax	0:66300c77c6e9	469	} else {
tax	0:66300c77c6e9	470	LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
tax	0:66300c77c6e9	471	}
tax	0:66300c77c6e9	472
tax	0:66300c77c6e9	473	if (group != NULL) {
tax	0:66300c77c6e9	474	IGMP_STATS_INC(igmp.rx_group);
tax	0:66300c77c6e9	475	igmp_delaying_member(group, igmp->igmp_maxresp);
tax	0:66300c77c6e9	476	} else {
tax	0:66300c77c6e9	477	IGMP_STATS_INC(igmp.drop);
tax	0:66300c77c6e9	478	}
tax	0:66300c77c6e9	479	} else {
tax	0:66300c77c6e9	480	IGMP_STATS_INC(igmp.proterr);
tax	0:66300c77c6e9	481	}
tax	0:66300c77c6e9	482	}
tax	0:66300c77c6e9	483	break;
tax	0:66300c77c6e9	484	}
tax	0:66300c77c6e9	485	case IGMP_V2_MEMB_REPORT: {
tax	0:66300c77c6e9	486	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
tax	0:66300c77c6e9	487	IGMP_STATS_INC(igmp.rx_report);
tax	0:66300c77c6e9	488	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
tax	0:66300c77c6e9	489	/* This is on a specific group we have already looked up */
tax	0:66300c77c6e9	490	group->timer = 0; /* stopped */
tax	0:66300c77c6e9	491	group->group_state = IGMP_GROUP_IDLE_MEMBER;
tax	0:66300c77c6e9	492	group->last_reporter_flag = 0;
tax	0:66300c77c6e9	493	}
tax	0:66300c77c6e9	494	break;
tax	0:66300c77c6e9	495	}
tax	0:66300c77c6e9	496	default: {
tax	0:66300c77c6e9	497	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
tax	0:66300c77c6e9	498	igmp->igmp_msgtype, group->group_state, &group, group->netif));
tax	0:66300c77c6e9	499	IGMP_STATS_INC(igmp.proterr);
tax	0:66300c77c6e9	500	break;
tax	0:66300c77c6e9	501	}
tax	0:66300c77c6e9	502	}
tax	0:66300c77c6e9	503
tax	0:66300c77c6e9	504	pbuf_free(p);
tax	0:66300c77c6e9	505	return;
tax	0:66300c77c6e9	506	}
tax	0:66300c77c6e9	507
tax	0:66300c77c6e9	508	/**
tax	0:66300c77c6e9	509	* Join a group on one network interface.
tax	0:66300c77c6e9	510	*
tax	0:66300c77c6e9	511	* @param ifaddr ip address of the network interface which should join a new group
tax	0:66300c77c6e9	512	* @param groupaddr the ip address of the group which to join
tax	0:66300c77c6e9	513	* @return ERR_OK if group was joined on the netif(s), an err_t otherwise
tax	0:66300c77c6e9	514	*/
tax	0:66300c77c6e9	515	err_t
tax	0:66300c77c6e9	516	igmp_joingroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
tax	0:66300c77c6e9	517	{
tax	0:66300c77c6e9	518	err_t err = ERR_VAL; /* no matching interface */
tax	0:66300c77c6e9	519	struct igmp_group *group;
tax	0:66300c77c6e9	520	struct netif *netif;
tax	0:66300c77c6e9	521
tax	0:66300c77c6e9	522	/* make sure it is multicast address */
tax	0:66300c77c6e9	523	LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
tax	0:66300c77c6e9	524	LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
tax	0:66300c77c6e9	525
tax	0:66300c77c6e9	526	/* loop through netif's */
tax	0:66300c77c6e9	527	netif = netif_list;
tax	0:66300c77c6e9	528	while (netif != NULL) {
tax	0:66300c77c6e9	529	/* Should we join this interface ? */
tax	0:66300c77c6e9	530	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
tax	0:66300c77c6e9	531	/* find group or create a new one if not found */
tax	0:66300c77c6e9	532	group = igmp_lookup_group(netif, groupaddr);
tax	0:66300c77c6e9	533
tax	0:66300c77c6e9	534	if (group != NULL) {
tax	0:66300c77c6e9	535	/* This should create a new group, check the state to make sure */
tax	0:66300c77c6e9	536	if (group->group_state != IGMP_GROUP_NON_MEMBER) {
tax	0:66300c77c6e9	537	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
tax	0:66300c77c6e9	538	} else {
tax	0:66300c77c6e9	539	/* OK - it was new group */
tax	0:66300c77c6e9	540	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
tax	0:66300c77c6e9	541	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
tax	0:66300c77c6e9	542	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
tax	0:66300c77c6e9	543
tax	0:66300c77c6e9	544	/* If first use of the group, allow the group at the MAC level */
tax	0:66300c77c6e9	545	if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
tax	0:66300c77c6e9	546	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
tax	0:66300c77c6e9	547	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
tax	0:66300c77c6e9	548	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
tax	0:66300c77c6e9	549	netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
tax	0:66300c77c6e9	550	}
tax	0:66300c77c6e9	551
tax	0:66300c77c6e9	552	IGMP_STATS_INC(igmp.tx_join);
tax	0:66300c77c6e9	553	igmp_send(group, IGMP_V2_MEMB_REPORT);
tax	0:66300c77c6e9	554
tax	0:66300c77c6e9	555	igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
tax	0:66300c77c6e9	556
tax	0:66300c77c6e9	557	/* Need to work out where this timer comes from */
tax	0:66300c77c6e9	558	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
tax	0:66300c77c6e9	559	}
tax	0:66300c77c6e9	560	/* Increment group use */
tax	0:66300c77c6e9	561	group->use++;
tax	0:66300c77c6e9	562	/* Join on this interface */
tax	0:66300c77c6e9	563	err = ERR_OK;
tax	0:66300c77c6e9	564	} else {
tax	0:66300c77c6e9	565	/* Return an error even if some network interfaces are joined */
tax	0:66300c77c6e9	566	/** @todo undo any other netif already joined */
tax	0:66300c77c6e9	567	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
tax	0:66300c77c6e9	568	return ERR_MEM;
tax	0:66300c77c6e9	569	}
tax	0:66300c77c6e9	570	}
tax	0:66300c77c6e9	571	/* proceed to next network interface */
tax	0:66300c77c6e9	572	netif = netif->next;
tax	0:66300c77c6e9	573	}
tax	0:66300c77c6e9	574
tax	0:66300c77c6e9	575	return err;
tax	0:66300c77c6e9	576	}
tax	0:66300c77c6e9	577
tax	0:66300c77c6e9	578	/**
tax	0:66300c77c6e9	579	* Leave a group on one network interface.
tax	0:66300c77c6e9	580	*
tax	0:66300c77c6e9	581	* @param ifaddr ip address of the network interface which should leave a group
tax	0:66300c77c6e9	582	* @param groupaddr the ip address of the group which to leave
tax	0:66300c77c6e9	583	* @return ERR_OK if group was left on the netif(s), an err_t otherwise
tax	0:66300c77c6e9	584	*/
tax	0:66300c77c6e9	585	err_t
tax	0:66300c77c6e9	586	igmp_leavegroup(ip_addr_t ifaddr, ip_addr_t groupaddr)
tax	0:66300c77c6e9	587	{
tax	0:66300c77c6e9	588	err_t err = ERR_VAL; /* no matching interface */
tax	0:66300c77c6e9	589	struct igmp_group *group;
tax	0:66300c77c6e9	590	struct netif *netif;
tax	0:66300c77c6e9	591
tax	0:66300c77c6e9	592	/* make sure it is multicast address */
tax	0:66300c77c6e9	593	LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
tax	0:66300c77c6e9	594	LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
tax	0:66300c77c6e9	595
tax	0:66300c77c6e9	596	/* loop through netif's */
tax	0:66300c77c6e9	597	netif = netif_list;
tax	0:66300c77c6e9	598	while (netif != NULL) {
tax	0:66300c77c6e9	599	/* Should we leave this interface ? */
tax	0:66300c77c6e9	600	if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) \|\| ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
tax	0:66300c77c6e9	601	/* find group */
tax	0:66300c77c6e9	602	group = igmp_lookfor_group(netif, groupaddr);
tax	0:66300c77c6e9	603
tax	0:66300c77c6e9	604	if (group != NULL) {
tax	0:66300c77c6e9	605	/* Only send a leave if the flag is set according to the state diagram */
tax	0:66300c77c6e9	606	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
tax	0:66300c77c6e9	607	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
tax	0:66300c77c6e9	608	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
tax	0:66300c77c6e9	609
tax	0:66300c77c6e9	610	/* If there is no other use of the group */
tax	0:66300c77c6e9	611	if (group->use <= 1) {
tax	0:66300c77c6e9	612	/* If we are the last reporter for this group */
tax	0:66300c77c6e9	613	if (group->last_reporter_flag) {
tax	0:66300c77c6e9	614	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
tax	0:66300c77c6e9	615	IGMP_STATS_INC(igmp.tx_leave);
tax	0:66300c77c6e9	616	igmp_send(group, IGMP_LEAVE_GROUP);
tax	0:66300c77c6e9	617	}
tax	0:66300c77c6e9	618
tax	0:66300c77c6e9	619	/* Disable the group at the MAC level */
tax	0:66300c77c6e9	620	if (netif->igmp_mac_filter != NULL) {
tax	0:66300c77c6e9	621	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
tax	0:66300c77c6e9	622	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
tax	0:66300c77c6e9	623	LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
tax	0:66300c77c6e9	624	netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
tax	0:66300c77c6e9	625	}
tax	0:66300c77c6e9	626
tax	0:66300c77c6e9	627	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
tax	0:66300c77c6e9	628	ip_addr_debug_print(IGMP_DEBUG, groupaddr);
tax	0:66300c77c6e9	629	LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
tax	0:66300c77c6e9	630
tax	0:66300c77c6e9	631	/* Free the group */
tax	0:66300c77c6e9	632	igmp_remove_group(group);
tax	0:66300c77c6e9	633	} else {
tax	0:66300c77c6e9	634	/* Decrement group use */
tax	0:66300c77c6e9	635	group->use--;
tax	0:66300c77c6e9	636	}
tax	0:66300c77c6e9	637	/* Leave on this interface */
tax	0:66300c77c6e9	638	err = ERR_OK;
tax	0:66300c77c6e9	639	} else {
tax	0:66300c77c6e9	640	/* It's not a fatal error on "leavegroup" */
tax	0:66300c77c6e9	641	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
tax	0:66300c77c6e9	642	}
tax	0:66300c77c6e9	643	}
tax	0:66300c77c6e9	644	/* proceed to next network interface */
tax	0:66300c77c6e9	645	netif = netif->next;
tax	0:66300c77c6e9	646	}
tax	0:66300c77c6e9	647
tax	0:66300c77c6e9	648	return err;
tax	0:66300c77c6e9	649	}
tax	0:66300c77c6e9	650
tax	0:66300c77c6e9	651	/**
tax	0:66300c77c6e9	652	* The igmp timer function (both for NO_SYS=1 and =0)
tax	0:66300c77c6e9	653	* Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
tax	0:66300c77c6e9	654	*/
tax	0:66300c77c6e9	655	void
tax	0:66300c77c6e9	656	igmp_tmr(void)
tax	0:66300c77c6e9	657	{
tax	0:66300c77c6e9	658	struct igmp_group *group = igmp_group_list;
tax	0:66300c77c6e9	659
tax	0:66300c77c6e9	660	while (group != NULL) {
tax	0:66300c77c6e9	661	if (group->timer > 0) {
tax	0:66300c77c6e9	662	group->timer--;
tax	0:66300c77c6e9	663	if (group->timer == 0) {
tax	0:66300c77c6e9	664	igmp_timeout(group);
tax	0:66300c77c6e9	665	}
tax	0:66300c77c6e9	666	}
tax	0:66300c77c6e9	667	group = group->next;
tax	0:66300c77c6e9	668	}
tax	0:66300c77c6e9	669	}
tax	0:66300c77c6e9	670
tax	0:66300c77c6e9	671	/**
tax	0:66300c77c6e9	672	* Called if a timeout for one group is reached.
tax	0:66300c77c6e9	673	* Sends a report for this group.
tax	0:66300c77c6e9	674	*
tax	0:66300c77c6e9	675	* @param group an igmp_group for which a timeout is reached
tax	0:66300c77c6e9	676	*/
tax	0:66300c77c6e9	677	static void
tax	0:66300c77c6e9	678	igmp_timeout(struct igmp_group *group)
tax	0:66300c77c6e9	679	{
tax	0:66300c77c6e9	680	/* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
tax	0:66300c77c6e9	681	if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
tax	0:66300c77c6e9	682	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
tax	0:66300c77c6e9	683	ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
tax	0:66300c77c6e9	684	LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
tax	0:66300c77c6e9	685
tax	0:66300c77c6e9	686	IGMP_STATS_INC(igmp.tx_report);
tax	0:66300c77c6e9	687	igmp_send(group, IGMP_V2_MEMB_REPORT);
tax	0:66300c77c6e9	688	}
tax	0:66300c77c6e9	689	}
tax	0:66300c77c6e9	690
tax	0:66300c77c6e9	691	/**
tax	0:66300c77c6e9	692	* Start a timer for an igmp group
tax	0:66300c77c6e9	693	*
tax	0:66300c77c6e9	694	* @param group the igmp_group for which to start a timer
tax	0:66300c77c6e9	695	* @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
tax	0:66300c77c6e9	696	* every call to igmp_tmr())
tax	0:66300c77c6e9	697	*/
tax	0:66300c77c6e9	698	static void
tax	0:66300c77c6e9	699	igmp_start_timer(struct igmp_group *group, u8_t max_time)
tax	0:66300c77c6e9	700	{
tax	0:66300c77c6e9	701	/* ensure the input value is > 0 */
tax	0:66300c77c6e9	702	if (max_time == 0) {
tax	0:66300c77c6e9	703	max_time = 1;
tax	0:66300c77c6e9	704	}
tax	0:66300c77c6e9	705	/* ensure the random value is > 0 */
tax	0:66300c77c6e9	706	group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
tax	0:66300c77c6e9	707	}
tax	0:66300c77c6e9	708
tax	0:66300c77c6e9	709	/**
tax	0:66300c77c6e9	710	* Stop a timer for an igmp_group
tax	0:66300c77c6e9	711	*
tax	0:66300c77c6e9	712	* @param group the igmp_group for which to stop the timer
tax	0:66300c77c6e9	713	*/
tax	0:66300c77c6e9	714	static void
tax	0:66300c77c6e9	715	igmp_stop_timer(struct igmp_group *group)
tax	0:66300c77c6e9	716	{
tax	0:66300c77c6e9	717	group->timer = 0;
tax	0:66300c77c6e9	718	}
tax	0:66300c77c6e9	719
tax	0:66300c77c6e9	720	/**
tax	0:66300c77c6e9	721	* Delaying membership report for a group if necessary
tax	0:66300c77c6e9	722	*
tax	0:66300c77c6e9	723	* @param group the igmp_group for which "delaying" membership report
tax	0:66300c77c6e9	724	* @param maxresp query delay
tax	0:66300c77c6e9	725	*/
tax	0:66300c77c6e9	726	static void
tax	0:66300c77c6e9	727	igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
tax	0:66300c77c6e9	728	{
tax	0:66300c77c6e9	729	if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) \|\|
tax	0:66300c77c6e9	730	((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
tax	0:66300c77c6e9	731	((group->timer == 0) \|\| (maxresp < group->timer)))) {
tax	0:66300c77c6e9	732	igmp_start_timer(group, maxresp);
tax	0:66300c77c6e9	733	group->group_state = IGMP_GROUP_DELAYING_MEMBER;
tax	0:66300c77c6e9	734	}
tax	0:66300c77c6e9	735	}
tax	0:66300c77c6e9	736
tax	0:66300c77c6e9	737
tax	0:66300c77c6e9	738	/**
tax	0:66300c77c6e9	739	* Sends an IP packet on a network interface. This function constructs the IP header
tax	0:66300c77c6e9	740	* and calculates the IP header checksum. If the source IP address is NULL,
tax	0:66300c77c6e9	741	* the IP address of the outgoing network interface is filled in as source address.
tax	0:66300c77c6e9	742	*
tax	0:66300c77c6e9	743	* @param p the packet to send (p->payload points to the data, e.g. next
tax	0:66300c77c6e9	744	protocol header; if dest == IP_HDRINCL, p already includes an IP
tax	0:66300c77c6e9	745	header and p->payload points to that IP header)
tax	0:66300c77c6e9	746	* @param src the source IP address to send from (if src == IP_ADDR_ANY, the
tax	0:66300c77c6e9	747	* IP address of the netif used to send is used as source address)
tax	0:66300c77c6e9	748	* @param dest the destination IP address to send the packet to
tax	0:66300c77c6e9	749	* @param ttl the TTL value to be set in the IP header
tax	0:66300c77c6e9	750	* @param proto the PROTOCOL to be set in the IP header
tax	0:66300c77c6e9	751	* @param netif the netif on which to send this packet
tax	0:66300c77c6e9	752	* @return ERR_OK if the packet was sent OK
tax	0:66300c77c6e9	753	* ERR_BUF if p doesn't have enough space for IP/LINK headers
tax	0:66300c77c6e9	754	* returns errors returned by netif->output
tax	0:66300c77c6e9	755	*/
tax	0:66300c77c6e9	756	static err_t
tax	0:66300c77c6e9	757	igmp_ip_output_if(struct pbuf p, ip_addr_t src, ip_addr_t dest, struct netif netif)
tax	0:66300c77c6e9	758	{
tax	0:66300c77c6e9	759	/* This is the "router alert" option */
tax	0:66300c77c6e9	760	u16_t ra[2];
tax	0:66300c77c6e9	761	ra[0] = PP_HTONS(ROUTER_ALERT);
tax	0:66300c77c6e9	762	ra[1] = 0x0000; /* Router shall examine packet */
tax	0:66300c77c6e9	763	IGMP_STATS_INC(igmp.xmit);
tax	0:66300c77c6e9	764	return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
tax	0:66300c77c6e9	765	}
tax	0:66300c77c6e9	766
tax	0:66300c77c6e9	767	/**
tax	0:66300c77c6e9	768	* Send an igmp packet to a specific group.
tax	0:66300c77c6e9	769	*
tax	0:66300c77c6e9	770	* @param group the group to which to send the packet
tax	0:66300c77c6e9	771	* @param type the type of igmp packet to send
tax	0:66300c77c6e9	772	*/
tax	0:66300c77c6e9	773	static void
tax	0:66300c77c6e9	774	igmp_send(struct igmp_group *group, u8_t type)
tax	0:66300c77c6e9	775	{
tax	0:66300c77c6e9	776	struct pbuf* p = NULL;
tax	0:66300c77c6e9	777	struct igmp_msg* igmp = NULL;
tax	0:66300c77c6e9	778	ip_addr_t src = *IP_ADDR_ANY;
tax	0:66300c77c6e9	779	ip_addr_t* dest = NULL;
tax	0:66300c77c6e9	780
tax	0:66300c77c6e9	781	/* IP header + "router alert" option + IGMP header */
tax	0:66300c77c6e9	782	p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
tax	0:66300c77c6e9	783
tax	0:66300c77c6e9	784	if (p) {
tax	0:66300c77c6e9	785	igmp = (struct igmp_msg *)p->payload;
tax	0:66300c77c6e9	786	LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
tax	0:66300c77c6e9	787	(p->len >= sizeof(struct igmp_msg)));
tax	0:66300c77c6e9	788	ip_addr_copy(src, group->netif->ip_addr);
tax	0:66300c77c6e9	789
tax	0:66300c77c6e9	790	if (type == IGMP_V2_MEMB_REPORT) {
tax	0:66300c77c6e9	791	dest = &(group->group_address);
tax	0:66300c77c6e9	792	ip_addr_copy(igmp->igmp_group_address, group->group_address);
tax	0:66300c77c6e9	793	group->last_reporter_flag = 1; /* Remember we were the last to report */
tax	0:66300c77c6e9	794	} else {
tax	0:66300c77c6e9	795	if (type == IGMP_LEAVE_GROUP) {
tax	0:66300c77c6e9	796	dest = &allrouters;
tax	0:66300c77c6e9	797	ip_addr_copy(igmp->igmp_group_address, group->group_address);
tax	0:66300c77c6e9	798	}
tax	0:66300c77c6e9	799	}
tax	0:66300c77c6e9	800
tax	0:66300c77c6e9	801	if ((type == IGMP_V2_MEMB_REPORT) \|\| (type == IGMP_LEAVE_GROUP)) {
tax	0:66300c77c6e9	802	igmp->igmp_msgtype = type;
tax	0:66300c77c6e9	803	igmp->igmp_maxresp = 0;
tax	0:66300c77c6e9	804	igmp->igmp_checksum = 0;
tax	0:66300c77c6e9	805	igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
tax	0:66300c77c6e9	806
tax	0:66300c77c6e9	807	igmp_ip_output_if(p, &src, dest, group->netif);
tax	0:66300c77c6e9	808	}
tax	0:66300c77c6e9	809
tax	0:66300c77c6e9	810	pbuf_free(p);
tax	0:66300c77c6e9	811	} else {
tax	0:66300c77c6e9	812	LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
tax	0:66300c77c6e9	813	IGMP_STATS_INC(igmp.memerr);
tax	0:66300c77c6e9	814	}
tax	0:66300c77c6e9	815	}
tax	0:66300c77c6e9	816
tax	0:66300c77c6e9	817	#endif /* LWIP_IGMP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	29 Mar 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

lwip/core/ipv4/igmp.c@0:66300c77c6e9, 2011-03-29 (annotated)

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