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182 lines
7.5 KiB
182 lines
7.5 KiB
/**************************************************************************** |
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* net/uip/uip_igmpleave.c |
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* |
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* Copyright (C) 2010-2011 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 <wdog.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_leavegroup |
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* |
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* Description: |
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* Remove 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 leaves a multicast group, if it was the last host to |
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* reply to a Query with a Membership Report for that group, it SHOULD |
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* send a Leave Group message to the all-routers multicast group |
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* (224.0.0.2). If it was not the last host to reply to a Query, it MAY |
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* send nothing as there must be another member on the subnet. This is |
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* an optimization to reduce traffic; a host without sufficient storage |
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* to remember whether or not it was the last host to reply MAY always |
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* send a Leave Group message when it leaves a group. Routers SHOULD |
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* accept a Leave Group message addressed to the group being left, in |
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* order to accommodate implementations of an earlier version of this |
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* standard. Leave Group messages are addressed to the all-routers |
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* group because other group members have no need to know that a host |
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* has left the group, but it does no harm to address the message to the |
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* group." |
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* |
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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_leavegroup(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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uip_lock_t flags; |
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DEBUGASSERT(dev && grpaddr); |
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/* Find the entry corresponding to the address leaving the group */ |
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group = uip_grpfind(dev, &grpaddr->s_addr); |
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ndbg("Leaving group: %p\n", group); |
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if (group) |
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{ |
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/* Cancel the timer and discard any queued Membership Reports. Canceling |
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* the timer will prevent any new Membership Reports from being sent; |
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* clearing the flags will discard any pending Membership Reports that |
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* could interfere with the Leave Group. |
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*/ |
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flags = uip_lock(); |
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wd_cancel(group->wdog); |
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CLR_SCHEDMSG(group->flags); |
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CLR_WAITMSG(group->flags); |
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uip_unlock(flags); |
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IGMP_STATINCR(uip_stat.igmp.leaves); |
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/* Send a leave if the flag is set according to the state diagram */ |
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if (IS_LASTREPORT(group->flags)) |
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{ |
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ndbg("Schedule Leave Group message\n"); |
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IGMP_STATINCR(uip_stat.igmp.leave_sched); |
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uip_igmpwaitmsg(group, IGMP_LEAVE_GROUP); |
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} |
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/* Free the group structure (state is now Non-Member */ |
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uip_grpfree(dev, group); |
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/* And remove the group address from the ethernet drivers MAC filter set */ |
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uip_removemcastmac(dev, (FAR uip_ipaddr_t *)&grpaddr->s_addr); |
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return OK; |
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} |
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/* Return ENOENT if the address is not a member of the group */ |
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nvdbg("Return -ENOENT\n"); |
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return -ENOENT; |
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} |
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#endif /* CONFIG_NET_IGMP */
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