/**************************************************************************** * net/igmp/igmp.h * * Copyright (C) 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 NuttX 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 THE COPYRIGHT HOLDERS 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 THE * COPYRIGHT OWNER 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. * ****************************************************************************/ /* * ________________ * | | * | | * | | * | | * +--------->| 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) | * +-------------------+ */ #ifndef _NET_IGMP_IGMP_H #define _NET_IGMP_IGMP_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #ifdef CONFIG_NET_IGMP /**************************************************************************** * Public Type Definitions ****************************************************************************/ /* This structure represents one group member. There is a list of groups * for each device interface structure. * * There will be a group for the all systems group address but this * will not run the state machine as it is used to kick off reports * from all the other groups */ typedef FAR struct wdog_s *WDOG_ID; struct igmp_group_s { struct igmp_group_s *next; /* Implements a singly-linked list */ in_addr_t grpaddr; /* Group IPv4 address */ WDOG_ID wdog; /* WDOG used to detect timeouts */ sem_t sem; /* Used to wait for message transmission */ volatile uint8_t flags; /* See IGMP_ flags definitions */ uint8_t msgid; /* Pending message ID (if non-zero) */ }; /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus # define EXTERN extern "C" extern "C" { #else # define EXTERN extern #endif EXTERN in_addr_t g_ipv4_allsystems; EXTERN in_addr_t g_ipv4_allrouters; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: igmp_initialize * * Description: * Perform one-time IGMP initialization. * ****************************************************************************/ void igmp_initialize(void); /**************************************************************************** * Name: igmp_devinit * * Description: * Called when a new network device is registered to configure that device * for IGMP support. * ****************************************************************************/ void igmp_devinit(FAR struct net_driver_s *dev); /**************************************************************************** * Name: igmp_input * * Description: * An IGMP packet has been received. * ****************************************************************************/ void igmp_input(struct net_driver_s *dev); /**************************************************************************** * Name: igmp_grpalloc * * Description: * Allocate a new group from heap memory. * ****************************************************************************/ FAR struct igmp_group_s *igmp_grpalloc(FAR struct net_driver_s *dev, FAR const in_addr_t *addr); /**************************************************************************** * Name: igmp_grpfind * * Description: * Find an existing group. * ****************************************************************************/ FAR struct igmp_group_s *igmp_grpfind(FAR struct net_driver_s *dev, FAR const in_addr_t *addr); /**************************************************************************** * Name: igmp_grpallocfind * * Description: * Find an existing group. If not found, create a new group for the * address. * ****************************************************************************/ FAR struct igmp_group_s *igmp_grpallocfind(FAR struct net_driver_s *dev, FAR const in_addr_t *addr); /**************************************************************************** * Name: igmp_grpfree * * Description: * Release a previously allocated group. * ****************************************************************************/ void igmp_grpfree(FAR struct net_driver_s *dev, FAR struct igmp_group_s *group); /**************************************************************************** * Name: igmp_schedmsg * * Description: * Schedule a message to be send at the next driver polling interval. * ****************************************************************************/ void igmp_schedmsg(FAR struct igmp_group_s *group, uint8_t msgid); /**************************************************************************** * Name: igmp_waitmsg * * Description: * Schedule a message to be send at the next driver polling interval and * block, waiting for the message to be sent. * ****************************************************************************/ void igmp_waitmsg(FAR struct igmp_group_s *group, uint8_t msgid); /**************************************************************************** * Name: igmp_poll * * 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. * ****************************************************************************/ void igmp_poll(FAR struct net_driver_s *dev); /**************************************************************************** * Name: igmp_send * * Description: * Sends an IGMP IP packet on a network interface. This function constructs * the IP header and calculates the IP header checksum. * * Parameters: * dev - The device driver structure to use in the send operation. * group - Describes the multicast group member and identifies the * message to be sent. * destipaddr - The IP address of the recipient of the message * * Returned Value: * None * * Assumptions: * The network is locked. * ****************************************************************************/ void igmp_send(FAR struct net_driver_s *dev, FAR struct igmp_group_s *group, FAR in_addr_t *dest); /**************************************************************************** * 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)." * ****************************************************************************/ int igmp_joingroup(FAR struct net_driver_s *dev, FAR const struct in_addr *grpaddr); /**************************************************************************** * Name: igmp_leavegroup * * Description: * Remove the specified group address to the group. * * RFC 2236, 3. Protocol Description: * * "When a host leaves a multicast group, if it was the last host to * reply to a Query with a Membership Report for that group, it SHOULD * send a Leave Group message to the all-routers multicast group * (224.0.0.2). If it was not the last host to reply to a Query, it MAY * send nothing as there must be another member on the subnet. This is * an optimization to reduce traffic; a host without sufficient storage * to remember whether or not it was the last host to reply MAY always * send a Leave Group message when it leaves a group. Routers SHOULD * accept a Leave Group message addressed to the group being left, in * order to accommodate implementations of an earlier version of this * standard. Leave Group messages are addressed to the all-routers * group because other group members have no need to know that a host * has left the group, but it does no harm to address the message to the * group." * ****************************************************************************/ int igmp_leavegroup(FAR struct net_driver_s *dev, FAR const struct in_addr *grpaddr); /**************************************************************************** * Name: igmp_startticks and igmp_starttimer * * Description: * Start the IGMP timer with differing time units (ticks or deciseconds). * ****************************************************************************/ void igmp_startticks(FAR struct igmp_group_s *group, unsigned int ticks); void igmp_starttimer(FAR struct igmp_group_s *group, uint8_t decisecs); /**************************************************************************** * Name: igmp_cmptimer * * Description: * Compare the timer remaining on the watching timer to the deci-second * value. If maxticks > ticks-remaining, then (1) cancel the timer (to * avoid race conditions) and return true. * * If true is returned then the caller must call igmp_startticks() to * restart the timer * ****************************************************************************/ bool igmp_cmptimer(FAR struct igmp_group_s *group, int maxticks); /**************************************************************************** * Name: igmp_addmcastmac * * Description: * Add an IGMP MAC address to the device's MAC filter table. * ****************************************************************************/ void igmp_addmcastmac(FAR struct net_driver_s *dev, FAR in_addr_t *ip); /**************************************************************************** * Name: igmp_removemcastmac * * Description: * Remove an IGMP MAC address from the device's MAC filter table. * ****************************************************************************/ void igmp_removemcastmac(FAR struct net_driver_s *dev, FAR in_addr_t *ip); #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_NET_IGMP */ #endif /* _NET_IGMP_IGMP_H */