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