1c15aa3b2d
net/mld: More updates from comparison with roughly leveraged code and the MDL RFCs 2710 and 3810.
net/mld: More updated from comparison with roughly leveraged code and the MDL RFCs 2710 and 3810.
net/mld: Beginning comparison with roughly leveraged code and the MDL RFCs 2710 and 3810.
480 lines
19 KiB
C
480 lines
19 KiB
C
/****************************************************************************
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* net/mld/mld.h
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* Multicast Listener Discovery (MLD) Definitions
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/* State transition diagram for a router in Querier state (RFC 2710):
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* ________________
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* | |
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* | |timer expired
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* timer expired| |(notify routing -,
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* (notify routing -)| No Listeners |clear rxmt tmr)
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* ------->| Present |<---------
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* | | | |
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* | | | |
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* | |________________| | ---------------
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* | | | | rexmt timer |
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* | report received| | | expired |
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* | (notify routing +,| | | (send m-a-s |
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* | start timer)| | | query, |
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* __________|______ | ________|_|______ st rxmt |
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* | |<------------ | | tmr) |
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* | | | |<-------
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* | | report received | |
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* | | (start timer, | |
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* | | clear rxmt tmr) | |
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* | Listeners |<-------------------| Checking |
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* | Present | done received | Listeners |
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* | | (start timer*, | |
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* | | start rxmt timer, | |
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* | | send m-a-s query) | |
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* --->| |------------------->| |
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* | |_________________| |_________________|
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* | report received |
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* | (start timer) |
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* -----------------
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*
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* State transition diagram for a router in Non-Querier state is
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* similar, but non-Queriers do not send any messages and are only
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* driven by message reception.
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*
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* ________________
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* | |
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* | |
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* timer expired| |timer expired
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* (notify routing -)| No Listeners |(notify routing -)
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* --------->| Present |<---------
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* | | | |
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* | | | |
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* | | | |
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* | |________________| |
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* | | |
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* | |report received |
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* | |(notify routing +,|
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* | | start timer) |
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* ________|________ | ________|________
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* | |<--------- | |
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* | | report received | |
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* | | (start timer) | |
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* | Listeners |<-------------------| Checking |
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* | Present | m-a-s query rec'd | Listeners |
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* | | (start timer*) | |
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* ---->| |------------------->| |
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* | |_________________| |_________________|
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* | report received |
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* | (start timer) |
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* -----------------
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*/
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#ifndef __NET_NETLINK_MLD_H
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#define __NET_NETLINK_MLD_H
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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 <sys/types.h>
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#include <queue.h>
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#include <semaphore.h>
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#include <nuttx/net/ip.h>
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#include "devif/devif.h"
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#include "socket/socket.h"
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#ifdef CONFIG_NET_MLD
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Group flags */
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#define MLD_QUERIER (1 << 0) /* Querier */
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#define MLD_STARTUP (1 << 2) /* Startup unsolicited Reports */
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#define MLD_V1COMPAT (1 << 3) /* Version 1 compatibility mode */
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#define MLD_LASTREPORT (1 << 3) /* We were the last to report */
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#define MLD_SCHEDMSG (1 << 4) /* Outgoing message scheduled */
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#define MLD_WAITMSG (1 << 5) /* Block until message sent */
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#define SET_MLD_QUERIER(f) do { (f) |= MLD_QUERIER; } while (0)
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#define SET_MLD_STARTUP(f) do { (f) |= MLD_STARTUP; } while (0)
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#define SET_MLD_V1COMPAT(f) do { (f) |= MLD_V1COMPAT; } while (0)
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#define SET_MLD_LASTREPORT(f) do { (f) |= MLD_LASTREPORT; } while (0)
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#define SET_MLD_SCHEDMSG(f) do { (f) |= MLD_SCHEDMSG; } while (0)
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#define SET_MLD_WAITMSG(f) do { (f) |= MLD_WAITMSG; } while (0)
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#define CLR_MLD_QUERIER(f) do { (f) &= ~MLD_QUERIER; } while (0)
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#define CLR_MLD_STARTUP(f) do { (f) &= ~MLD_STARTUP; } while (0)
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#define CLR_MLD_V1COMPAT(f) do { (f) &= ~MLD_V1COMPAT; } while (0)
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#define CLR_MLD_LASTREPORT(f) do { (f) &= ~MLD_LASTREPORT; } while (0)
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#define CLR_MLD_SCHEDMSG(f) do { (f) &= ~MLD_SCHEDMSG; } while (0)
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#define CLR_MLD_WAITMSG(f) do { (f) &= ~MLD_WAITMSG; } while (0)
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#define IS_MLD_QUERIER(f) (((f) & MLD_QUERIER) != 0)
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#define IS_MLD_STARTUP(f) (((f) & MLD_STARTUP) != 0)
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#define IS_MLD_V1COMPAT(f) (((f) & MLD_V1COMPAT) != 0)
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#define IS_MLD_LASTREPORT(f) (((f) & MLD_LASTREPORT) != 0)
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#define IS_MLD_SCHEDMSG(f) (((f) & MLD_SCHEDMSG) != 0)
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#define IS_MLD_WAITMSG(f) (((f) & MLD_WAITMSG) != 0)
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* These are the types of messages that may be sent in response to a device
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* poll.
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*/
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enum mld_msgtype_e
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{
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MLD_SEND_NONE = 0, /* Nothing to send */
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MLD_SEND_GENQUERY, /* Send General Query */
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MLD_SEND_REPORT, /* Send Unsolicited report */
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MLD_SEND_DONE /* Send Done message */
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};
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/* This structure represents one group member. There is a list of groups
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* for each device interface structure.
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*
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* There will be a group for the all systems group address but this
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* will not run the state machine as it is used to kick off reports
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* from all the other groups
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*/
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typedef FAR struct wdog_s *WDOG_ID;
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struct mld_group_s
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{
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struct mld_group_s *next; /* Implements a singly-linked list */
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net_ipv6addr_t grpaddr; /* Group IPv6 address */
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WDOG_ID wdog; /* WDOG used to detect timeouts */
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sem_t sem; /* Used to wait for message transmission */
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volatile uint8_t flags; /* See MLD_ flags definitions */
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uint8_t msgtype; /* Pending message type to send (if non-zero) */
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uint8_t count; /* Report repetition count */
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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# define EXTERN extern "C"
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extern "C"
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{
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#else
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# define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct ipv6_mreq; /* Forward reference */
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struct net_driver_s; /* Forward reference */
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struct mld_mcast_listen_query_s; /* Forward reference */
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struct mld_mcast_listen_report_v1_s; /* Forward reference */
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struct mld_mcast_listen_report_v2_s; /* Forward reference */
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struct mld_mcast_listen_done_v1_s; /* Forward reference */
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/****************************************************************************
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* Name: mld_initialize()
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*
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* Description:
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* Initialize the MLD structures. Called once and only from the
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* networking layer.
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*
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****************************************************************************/
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void mld_initialize(void);
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/****************************************************************************
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* Name: mld_devinit
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*
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* Description:
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* Called when a new network device is registered to configure that device
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* for MLD support.
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*
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****************************************************************************/
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void mld_devinit(FAR struct net_driver_s *dev);
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/****************************************************************************
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* Name: mld_query
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*
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* Description:
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* Called from icmpv6_input() when a Multicast Listener Query is received.
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*
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****************************************************************************/
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int mld_query(FAR struct net_driver_s *dev,
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FAR const struct mld_mcast_listen_query_s *query);
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/****************************************************************************
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* Name: mld_report_v1
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*
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* Description:
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* Called from icmpv6_input() when a Version 1 Multicast Listener Report is
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* received.
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*
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****************************************************************************/
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int mld_report_v1(FAR struct net_driver_s *dev,
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FAR const struct mld_mcast_listen_report_v1_s *report);
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/****************************************************************************
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* Name: mld_report_v2
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*
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* Description:
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* Called from icmpv6_input() when a Version 2 Multicast Listener Report is
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* received.
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*
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****************************************************************************/
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int mld_report_v2(FAR struct net_driver_s *dev,
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FAR const struct mld_mcast_listen_report_v2_s *report);
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/****************************************************************************
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* Name: mld_done_v1
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*
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* Description:
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* Called from icmpv6_input() when a Version 1 Multicast Listener Done is
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* received.
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*
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****************************************************************************/
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int mld_done_v1(FAR struct net_driver_s *dev,
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FAR const struct mld_mcast_listen_done_v1_s *done);
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/****************************************************************************
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* Name: mld_grpalloc
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*
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* Description:
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* Allocate a new group from heap memory.
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*
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****************************************************************************/
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FAR struct mld_group_s *mld_grpalloc(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t addr);
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/****************************************************************************
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* Name: mld_grpfind
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*
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* Description:
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* Find an existing group.
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*
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****************************************************************************/
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FAR struct mld_group_s *mld_grpfind(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t addr);
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/****************************************************************************
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* Name: mld_grpallocfind
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*
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* Description:
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* Find an existing group. If not found, create a new group for the
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* address.
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*
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****************************************************************************/
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FAR struct mld_group_s *mld_grpallocfind(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t addr);
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/****************************************************************************
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* Name: mld_grpfree
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*
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* Description:
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* Release a previously allocated group.
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*
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****************************************************************************/
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void mld_grpfree(FAR struct net_driver_s *dev,
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FAR struct mld_group_s *group);
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/****************************************************************************
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* Name: mld_schedmsg
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*
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* Description:
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* Schedule a message to be send at the next driver polling interval.
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*
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****************************************************************************/
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void mld_schedmsg(FAR struct mld_group_s *group, uint8_t msgtype);
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/****************************************************************************
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* Name: mld_waitmsg
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*
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* Description:
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* Schedule a message to be send at the next driver polling interval and
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* block, waiting for the message to be sent.
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*
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****************************************************************************/
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void mld_waitmsg(FAR struct mld_group_s *group, uint8_t msgtype);
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/****************************************************************************
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* Name: mld_poll
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*
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* Description:
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* Poll the groups associated with the device to see if any MLD messages
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* are pending transfer.
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*
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* Returned Value:
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* Returns a non-zero value if a IGP message is sent.
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*
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****************************************************************************/
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void mld_poll(FAR struct net_driver_s *dev);
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/****************************************************************************
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* Name: mld_send
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*
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* Description:
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* Sends an MLD IP packet on a network interface. This function constructs
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* the IP header and calculates the IP header checksum.
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*
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* Input Parameters:
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* dev - The device driver structure to use in the send operation.
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* group - Describes the multicast group member and identifies the
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* message to be sent.
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* destipaddr - The IP address of the recipient of the message
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* The network is locked.
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*
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****************************************************************************/
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void mld_send(FAR struct net_driver_s *dev, FAR struct mld_group_s *group,
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FAR const net_ipv6addr_t dest);
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/****************************************************************************
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* Name: mld_joingroup
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*
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* Description:
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* Add the specified group address to the group. This function
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* implements the logic for the IPV6_JOIN_GROUP socket option.
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*
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* The IPV6_JOIN_GROUP socket option is used to join a multicast group.
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* This is accomplished by using the setsockopt() API and specifying the
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* address of the ipv6_mreq structure containing the IPv6 multicast address
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* and the local IPv6 multicast interface index. The stack chooses a
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* default multicast interface if an interface index of 0 is passed. The
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* values specified in the IPV6_MREQ structure used by IPV6_JOIN_GROUP
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* and IPV6_LEAVE_GROUP must be symmetrical. The format of the ipv6_mreq
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* structure can be found in include/netinet/in.h
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*
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****************************************************************************/
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int mld_joingroup(FAR const struct ipv6_mreq *mrec);
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/****************************************************************************
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* Name: mld_leavegroup
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*
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* Description:
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* Remove the specified group address to the group. This function
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* implements the logic for the IPV6_LEAVE_GROUP socket option.
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*
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* The IPV6_JOIN_GROUP socket option is used to join a multicast group.
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* This is accomplished by using the setsockopt() API and specifying the
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* address of the ipv6_mreq structure containing the IPv6 multicast address
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* and the local IPv6 multicast interface index. The stack chooses a
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* default multicast interface if an interface index of 0 is passed. The
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* values specified in the IPV6_MREQ structure used by IPV6_JOIN_GROUP
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* and IPV6_LEAVE_GROUP must be symmetrical. The format of the ipv6_mreq
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* structure can be found in include/netinet/in.h
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*
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****************************************************************************/
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int mld_leavegroup(FAR const struct ipv6_mreq *mrec);
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/****************************************************************************
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* Name: mld_starttimer
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*
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* Description:
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* Start the MLD timer with differing time units (ticks or deciseconds).
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*
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****************************************************************************/
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void mld_starttimer(FAR struct mld_group_s *group, clock_t ticks);
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/****************************************************************************
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* Name: mld_cmptimer
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*
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* Description:
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* Compare the timer remaining on the watching timer to the deci-second
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* value. If maxticks > ticks-remaining, then (1) cancel the timer (to
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* avoid race conditions) and return true.
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*
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* If true is returned then the caller must call mld_starttimer() to
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* restart the timer
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*
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****************************************************************************/
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bool mld_cmptimer(FAR struct mld_group_s *group, int maxticks);
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/****************************************************************************
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* Name: mld_addmcastmac
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*
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* Description:
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* Add an MLD MAC address to the device's MAC filter table.
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*
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****************************************************************************/
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void mld_addmcastmac(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t ipaddr);
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/****************************************************************************
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* Name: mld_removemcastmac
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*
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* Description:
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* Remove an MLD MAC address from the device's MAC filter table.
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*
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****************************************************************************/
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void mld_removemcastmac(FAR struct net_driver_s *dev,
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FAR const net_ipv6addr_t ipaddr);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_NET_MLD */
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#endif /* __NET_NETLINK_MLD_H */
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