/**************************************************************************** * net/uip/uip_igmppoll.c * * Copyright (C) 2010 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include "uip_internal.h" #ifdef CONFIG_NET_IGMP /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: uip_schedsend * * Description: * Construct the . * * Returned Value: * Returns a non-zero value if a IGP message is sent. * * Assumptions: * This function is called from the driver polling logic... probably within * an interrupt handler. * ****************************************************************************/ static inline void uip_schedsend(FAR struct uip_driver_s *dev, FAR struct igmp_group_s *group) { uip_ipaddr_t *dest; /* Check what kind of message we need to send. There are only two * possibilities: */ if (group->msgid == IGMPv2_MEMBERSHIP_REPORT) { dest = &group->grpaddr; nllvdbg("Send IGMPv2_MEMBERSHIP_REPORT, dest=%08x flags=%02x\n", *dest, group->flags); IGMP_STATINCR(uip_stat.igmp.report_sched); SET_LASTREPORT(group->flags); /* Remember we were the last to report */ } else { DEBUGASSERT(group->msgid == IGMP_LEAVE_GROUP); dest = &g_allrouters; nllvdbg("Send IGMP_LEAVE_GROUP, dest=%08x flags=%02x\n", *dest, group->flags); IGMP_STATINCR(uip_stat.igmp.leave_sched); } /* Send the message */ uip_igmpsend(dev, group, dest); /* Indicate that the message has been sent */ CLR_SCHEDMSG(group->flags); group->msgid = 0; /* If there is a thread waiting fore the message to be sent, wake it up */ if (IS_WAITMSG(group->flags)) { nllvdbg("Awakening waiter\n"); sem_post(&group->sem); } } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: uip_igmppoll * * Description: * Poll the groups associated with the device to see if any IGMP messages * are pending transfer. * * Returned Value: * Returns a non-zero value if a IGP message is sent. * * Assumptions: * This function is called from the driver polling logic... probably within * an interrupt handler. * ****************************************************************************/ void uip_igmppoll(FAR struct uip_driver_s *dev) { FAR struct igmp_group_s *group; nllvdbg("Entry\n"); /* Setup the poll operation */ dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPIGMPH_LEN]; dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPIGMPH_LEN]; dev->d_len = 0; dev->d_sndlen = 0; /* Check each member of the group */ for (group = (FAR struct igmp_group_s *)dev->grplist.head; group; group = group->next) { /* Does this member have a pending outgoing message? */ if (IS_SCHEDMSG(group->flags)) { /* Yes, create the IGMP message in the driver buffer */ uip_schedsend(dev, group); /* Mark the message as sent and break out */ CLR_SCHEDMSG(group->flags); break; } } } #endif /* CONFIG_NET_IGMP */