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Diffstat (limited to 'nuttx/net/uip/uip_igmpjoin.c')
| -rwxr-xr-x | nuttx/net/uip/uip_igmpjoin.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/nuttx/net/uip/uip_igmpjoin.c b/nuttx/net/uip/uip_igmpjoin.c new file mode 100755 index 000000000..eb6e88837 --- /dev/null +++ b/nuttx/net/uip/uip_igmpjoin.c @@ -0,0 +1,160 @@ +/**************************************************************************** + * net/uip/uip_igmpjoin.c + * + * Copyright (C) 2010 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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/uip/uipopt.h> +#include <nuttx/net/uip/uip.h> +#include <nuttx/net/uip/uip-igmp.h> + +#include "uip_internal.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 uip_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 = uip_grpfind(dev, &grpaddr->s_addr); + if (!group) + { + /* No... allocate a new entry */ + + nvdbg("Join to new group: %08x\n", grpaddr->s_addr); + group = uip_grpalloc(dev, &grpaddr->s_addr); + IGMP_STATINCR(uip_stat.igmp.joins); + + /* Send the Membership Report */ + + IGMP_STATINCR(uip_stat.igmp.report_sched); + uip_igmpwaitmsg(group, IGMPv2_MEMBERSHIP_REPORT); + + /* And start the timer at 10*100 msec */ + + uip_igmpstarttimer(group, 10); + + /* Add the group (MAC) address to the ether drivers MAC filter list */ + + uip_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 */ |