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160 lines
6.7 KiB
160 lines
6.7 KiB
/**************************************************************************** |
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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 <gnutt@nuttx.org> |
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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 <nuttx/net/uip/uipopt.h> |
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#include <nuttx/net/uip/uip.h> |
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#include <nuttx/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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