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.
313 lines
11 KiB
C
313 lines
11 KiB
C
/****************************************************************************
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* net/mld/mld_query.c
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
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* may be 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 CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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****************************************************************************/
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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 <assert.h>
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#include <debug.h>
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#include <nuttx/wdog.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/ip.h>
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#include <nuttx/net/mld.h>
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#include "devif/devif.h"
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#include "inet/inet.h"
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#include "mld/mld.h"
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#include "utils/utils.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define IPv6BUF ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mld_mrc2mrd
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*
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* Description:
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* Convert the MLD Maximum Response Code (MRC) to the Maximum Response
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* Delay (MRD) in units of system clock ticks.
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*
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****************************************************************************/
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static clock_t mld_mrc2mrd(uint16_t mrc)
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{
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uint32_t mrd; /* Units of milliseconds */
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/* If bit 15 is not set (i.e., mrc < 32768), then no conversion is required. */
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if (mrc < 32768)
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{
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mrd = mrc;
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}
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else
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{
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/* Conversion required */
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mrd = MLD_MRD_VALUE(mrc);
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}
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/* Return the MRD in units of clock ticks */
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return MSEC2TICK((clock_t)mrd);
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}
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/****************************************************************************
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* Name: mld_cmpaddr
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*
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* Description:
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* Perform a numerical comparison of the IPv6 Source Address and the IPv6
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* address of the link. Return true if the source address is less than
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* the link address.
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*
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****************************************************************************/
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static bool mld_cmpaddr(FAR struct net_driver_s *dev,
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const net_ipv6addr_t srcaddr)
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{
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int i;
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for (i = 0; i < 8; i++)
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{
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if (srcaddr[i] < dev->d_ipv6addr[i])
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{
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return true;
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}
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}
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return false;
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}
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/****************************************************************************
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* Name: mld_check_querier
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*
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* Description:
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* Perform a numerical comparison of the IPv6 Source Address and the IPv6
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* address of the link. Return true if the source address is less than
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* the link address.
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*
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****************************************************************************/
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static void mld_check_querier(FAR struct net_driver_s *dev,
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FAR struct ipv6_hdr_s *ipv6,
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FAR struct mld_group_s *member,
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uint16_t mrc)
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{
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clock_t ticks;
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/* Check if this member is a Querier */
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if (IS_MLD_QUERIER(member->flags))
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{
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/* This is a querier, check if the IPv6 source address is numerically
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* less than the IPv6 address assigned to this link.
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*/
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if (mld_cmpaddr(dev, ipv6->srcipaddr))
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{
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/* This is a querier, then switch to non-querier and set a timeout.
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* If additional queries are received within this timeout period,
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* then we need to revert to Querier.
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*/
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ticks = mld_mrc2mrd(mrc);
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if (mld_cmptimer(member, ticks))
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{
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mld_starttimer(member, ticks);
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CLR_MLD_QUERIER(member->flags);
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}
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}
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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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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* A router may assume one of two roles: Querier or Non-Querier. There is
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* normally only one Querier per link. All routers start up as a Querier
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* on each of their attached links. If a router hears a Query message
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* whose IPv6 Source Address is numerically less than its own selected
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* address for that link, it MUST become a Non-Querier on that link. If a
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* delay passes without receiving, from a particular attached link, any
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* Queries from a router with an address less than its own, a router
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* resumes the role of Querier on that link.
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*
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* A Querier for a link periodically sends a General Query on that link,
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* to solicit reports of all multicast addresses of interest on that link.
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* On startup, a router SHOULD send multiple General Queries spaced closely
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* together Interval] on all attached links in order to quickly and
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* reliably discover the presence of multicast listeners on those links.
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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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FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
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FAR struct mld_group_s *group;
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uint16_t mrc;
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bool unspec;
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ninfo("Multicast Listener Query\n");
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ninfo("destipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
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ipv6->destipaddr[0], ipv6->destipaddr[1], ipv6->destipaddr[2],
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ipv6->destipaddr[3], ipv6->destipaddr[4], ipv6->destipaddr[5],
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ipv6->destipaddr[6], ipv6->destipaddr[7]);
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/* Find the group (or create a new one) using the incoming IP address */
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group = mld_grpallocfind(dev, ipv6->destipaddr);
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if (group == NULL)
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{
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nerr("ERROR: Failed to allocate/find group\n");
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return -ENOENT;
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}
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/* Max Response Time. The Max Response Time field is meaningful only in
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* Query messages, and specifies the maximum allowed time before sending
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* a responding report in units of 1/10 second. In all other messages,
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* it is set to zero by the sender and ignored by receivers.
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*/
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/* Check if the query was sent to all systems */
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unspec = net_ipv6addr_cmp(query->grpaddr, g_ipv6_unspecaddr);
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mrc = NTOHS(query->mrc);
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if (net_ipv6addr_cmp(ipv6->destipaddr, g_ipv6_allnodes))
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{
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/* There are three variants of the Query message (RFC 3810):
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*
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* 1. A "General Query" is sent by the Querier to learn which
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* multicast addresses have listeners on an attached link. In a
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* General Query, both the Multicast Address field and the Number
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* of Sources (N) field are zero.
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* 2. A "Multicast Address Specific Query" is sent by the Querier to
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* learn if a particular multicast address has any listeners on an
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* attached link. In a Multicast Address Specific Query, the
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* Multicast Address field contains the multicast address of
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* interest, while the Number of Sources (N) field is set to zero.
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* 3. A "Multicast Address and Source Specific Query" is sent by the
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* Querier to learn if any of the sources from the specified list for
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* the particular multicast address has any listeners on an attached
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* link or not. In a Multicast Address and Source Specific Query the
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* Multicast Address field contains the multicast address of
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* interest, while the Source Address [i] field(s) contain(s) the
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* source address(es) of interest.
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*/
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if (unspec && query->nsources == 0)
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{
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FAR struct mld_group_s *member;
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/* This is the general query */
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ninfo("General multicast query\n");
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MLD_STATINCR(g_netstats.mld.gmq_query_received);
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for (member = (FAR struct mld_group_s *)dev->d_mld_grplist.head;
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member;
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member = member->next)
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{
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/* Skip over the all systems group entry */
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if (!net_ipv6addr_cmp(member->grpaddr, g_ipv6_allnodes))
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{
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/* REVISIT: Missing logic. No action is taken on the query. */
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mld_check_querier(dev, ipv6, member, mrc);
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}
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}
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}
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else if (!unspec && query->nsources == 0)
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{
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ninfo("Multicast Address Specific Query\n");
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MLD_STATINCR(g_netstats.mld.mas_query_received);
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/* We first need to re-lookup the group since we used the incoming
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* dest last time. Use the group address in the query.
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*/
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group = mld_grpallocfind(dev, query->grpaddr);
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/* REVISIT: Missing logic. No action is taken on the query. */
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mld_check_querier(dev, ipv6, group, mrc);
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}
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else
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{
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ninfo("Multicast Address and Source Specific Query\n");
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MLD_STATINCR(g_netstats.mld.massq_query_received);
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/* We first need to re-lookup the group since we used the incoming
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* dest last time. Use the group address in the query.
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*/
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group = mld_grpallocfind(dev, query->grpaddr);
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/* REVISIT: Missing logic. No action is taken on the query. */
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mld_check_querier(dev, ipv6, group, mrc);
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}
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}
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/* Not sent to all systems -- Unicast query */
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else if (!unspec)
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{
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ninfo("Unicast query\n");
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MLD_STATINCR(g_netstats.mld.ucast_query_received);
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mld_check_querier(dev, ipv6, group, mrc);
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}
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return OK;
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}
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