163 lines
6.7 KiB
C
163 lines
6.7 KiB
C
/****************************************************************************
|
|
* net/igmp/igmp_join.c
|
|
*
|
|
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* The NuttX implementation of IGMP was inspired by the IGMP add-on for the
|
|
* lwIP TCP/IP stack by Steve Reynolds:
|
|
*
|
|
* Copyright (c) 2002 CITEL Technologies Ltd.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/net/netconfig.h>
|
|
#include <nuttx/net/uip.h>
|
|
#include <nuttx/net/netstats.h>
|
|
#include <nuttx/net/igmp.h>
|
|
|
|
#include "devif/devif.h"
|
|
#include "igmp/igmp.h"
|
|
|
|
#ifdef CONFIG_NET_IGMP
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: igmp_joingroup
|
|
*
|
|
* Description:
|
|
* Add the specified group address to the group.
|
|
*
|
|
* RFC 2236, 3. Protocol Description:
|
|
*
|
|
* "When a host joins a multicast group, it should immediately transmit
|
|
* an unsolicited Version 2 Membership Report for that group, in case it
|
|
* is the first member of that group on the network. To cover the
|
|
* possibility of the initial Membership Report being lost or damaged,
|
|
* it is recommended that it be repeated once or twice after short
|
|
* delays [Unsolicited Report Interval]. (A simple way to accomplish
|
|
* this is to send the initial Version 2 Membership Report and then act
|
|
* as if a Group-Specific Query was received for that group, and set a
|
|
* timer appropriately)."
|
|
* ________________
|
|
* | |
|
|
* | |
|
|
* | |
|
|
* | |
|
|
* +--------->| Non-Member |<---------+
|
|
* | | | |
|
|
* | | | |
|
|
* | | | |
|
|
* | |________________| |
|
|
* | | |
|
|
* | leave group | join group | leave group
|
|
* | (stop timer, |(send report, | (send leave
|
|
* | send leave if | set flag, | if flag set)
|
|
* | flag set) | start timer) |
|
|
* ________|________ | ________|________
|
|
* | |<---------+ | |
|
|
* | | | |
|
|
* | |<-------------------| |
|
|
* | | query received | |
|
|
* | Delaying Member | (start timer) | Idle Member |
|
|
* +---->| |------------------->| |
|
|
* | | | report received | |
|
|
* | | | (stop timer, | |
|
|
* | | | clear flag) | |
|
|
* | |_________________|------------------->|_________________|
|
|
* | query received | timer expired
|
|
* | (reset timer if | (send report,
|
|
* | Max Resp Time | set flag)
|
|
* | < current timer) |
|
|
* +-------------------+
|
|
*
|
|
* Assumptions:
|
|
* This function cannot be called from interrupt handling logic!
|
|
*
|
|
****************************************************************************/
|
|
|
|
int igmp_joingroup(struct net_driver_s *dev, FAR const struct in_addr *grpaddr)
|
|
{
|
|
struct igmp_group_s *group;
|
|
|
|
DEBUGASSERT(dev && grpaddr);
|
|
|
|
/* Check if a this address is already in the group */
|
|
|
|
group = igmp_grpfind(dev, &grpaddr->s_addr);
|
|
if (!group)
|
|
{
|
|
/* No... allocate a new entry */
|
|
|
|
nvdbg("Join to new group: %08x\n", grpaddr->s_addr);
|
|
group = igmp_grpalloc(dev, &grpaddr->s_addr);
|
|
IGMP_STATINCR(g_netstats.igmp.joins);
|
|
|
|
/* Send the Membership Report */
|
|
|
|
IGMP_STATINCR(g_netstats.igmp.report_sched);
|
|
igmp_waitmsg(group, IGMPv2_MEMBERSHIP_REPORT);
|
|
|
|
/* And start the timer at 10*100 msec */
|
|
|
|
igmp_starttimer(group, 10);
|
|
|
|
/* Add the group (MAC) address to the ether drivers MAC filter list */
|
|
|
|
igmp_addmcastmac(dev, (FAR uip_ipaddr_t *)&grpaddr->s_addr);
|
|
return OK;
|
|
}
|
|
|
|
/* Return EEXIST if the address is already a member of the group */
|
|
|
|
return -EEXIST;
|
|
}
|
|
|
|
#endif /* CONFIG_NET_IGMP */
|