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Diffstat (limited to 'nuttx/net/uip/uip_igmppoll.c')
-rwxr-xr-x | nuttx/net/uip/uip_igmppoll.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/nuttx/net/uip/uip_igmppoll.c b/nuttx/net/uip/uip_igmppoll.c new file mode 100755 index 000000000..cec2a5e1b --- /dev/null +++ b/nuttx/net/uip/uip_igmppoll.c @@ -0,0 +1,176 @@ +/**************************************************************************** + * net/uip/uip_igmppoll.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-arch.h> + +#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 messsage 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 */ |