305 lines
11 KiB
C
305 lines
11 KiB
C
/****************************************************************************
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* net/igmp/igmp_input.c
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*
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* Copyright (C) 2010, 2014, 2020 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* The NuttX implementation of IGMP was inspired by the IGMP add-on for the
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* lwIP TCP/IP stack by Steve Reynolds:
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*
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* Copyright (c) 2002 CITEL Technologies Ltd.
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* All rights reserved.
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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
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* contributors may be used to endorse or promote products derived from
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* this software 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
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF 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 <inttypes.h>
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#include <stdint.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/igmp.h>
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#include "devif/devif.h"
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#include "igmp/igmp.h"
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#include "utils/utils.h"
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#ifdef CONFIG_NET_IGMP
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: igmp_input
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*
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* Description:
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* An IGMP packet has been received.
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*
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* ________________
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* | |
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* | |
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* | |
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* | |
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* +--------->| Non-Member |<---------+
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* | | | |
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* | | | |
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* | | | |
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* | |________________| |
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* | | |
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* | leave group | join group | leave group
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* | (stop timer, |(send report, | (send leave
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* | send leave if | set flag, | if flag set)
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* | flag set) | start timer) |
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* ________|________ | ________|________
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* | |<---------+ | |
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* | | | |
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* | |<-------------------| |
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* | | query received | |
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* | Delaying Member | (start timer) | Idle Member |
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* +---->| |------------------->| |
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* | | | report received | |
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* | | | (stop timer, | |
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* | | | clear flag) | |
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* | |_________________|------------------->|_________________|
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* | query received | timer expired
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* | (reset timer if | (send report,
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* | Max Resp Time | set flag)
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* | < current timer) |
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* +-------------------+
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*
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* NOTE: The network must be locked.
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*
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****************************************************************************/
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void igmp_input(struct net_driver_s *dev)
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{
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FAR struct igmp_iphdr_s *ipv4 = IPBUF(0);
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FAR struct igmp_hdr_s *igmp;
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FAR struct igmp_group_s *group;
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in_addr_t destipaddr;
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in_addr_t grpaddr;
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uint16_t iphdrlen;
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unsigned int ticks;
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ninfo("IGMP message: %04x%04x\n",
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ipv4->destipaddr[1], ipv4->destipaddr[0]);
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/* Get the IP header length (accounting for possible options). */
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iphdrlen = (ipv4->vhl & IPv4_HLMASK) << 2;
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/* The IGMP header immediately follows the IP header */
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igmp = IPBUF(iphdrlen);
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/* Verify the message length */
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if (dev->d_len < NET_LL_HDRLEN(dev) + (iphdrlen + IGMP_HDRLEN))
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{
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IGMP_STATINCR(g_netstats.igmp.length_errors);
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nwarn("WARNING: Length error\n");
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goto drop;
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}
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#ifdef CONFIG_NET_IGMP_CHECKSUMS
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/* Calculate and check the IGMP checksum */
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if (net_chksum((FAR uint16_t *)igmp, IGMP_HDRLEN) != 0)
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{
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IGMP_STATINCR(g_netstats.igmp.chksum_errors);
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nwarn("WARNING: Checksum error\n");
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goto drop;
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}
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#endif
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/* Find the group (or create a new one) using the incoming IP address. */
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destipaddr = net_ip4addr_conv32(ipv4->destipaddr);
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group = igmp_grpallocfind(dev, &destipaddr);
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if (group == NULL)
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{
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nerr("ERROR: Failed to find/allocate group: %08" PRIx32 "\n",
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(uint32_t)destipaddr);
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goto drop;
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}
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/* Now handle the message based on the IGMP message type */
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switch (igmp->type)
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{
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case IGMP_MEMBERSHIP_QUERY:
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/* RFC 2236, 2.2. ax Response Time
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* "The Max Response Time field is meaningful only in Membership
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* Query messages, and specifies the maximum allowed time before
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* sending a responding report in units of 1/10 second. In all
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* other messages, it is set to zero by the sender and ignored by
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* receivers.
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*/
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/* Check if the query was sent to all systems */
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if (net_ipv4addr_cmp(destipaddr, g_ipv4_allsystems))
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{
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/* Yes... Now check the if this is a general or a group
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* specific query.
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*
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* RFC 2236, 2.1. Type
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* There are two sub-types of Membership Query messages:
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* - General Query, used to learn which groups have members on an
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* attached network.
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* - Group-Specific Query, used to learn if a particular group
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* has any members on an attached network.
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*
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* RFC 2236, 2.4. Group Address
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* "In a Membership Query message, the group address field is
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* set to zero when sending a General Query, and set to the
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* group address being queried when sending a Group-Specific
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* Query."
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*/
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if (net_ipv4addr_cmp(igmp->grpaddr, INADDR_ANY) != 0)
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{
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FAR struct igmp_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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if (igmp->maxresp == 0)
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{
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IGMP_STATINCR(g_netstats.igmp.v1_received);
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igmp->maxresp = 10;
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nwarn("WARNING: V1 not implemented\n");
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}
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IGMP_STATINCR(g_netstats.igmp.query_received);
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member = (FAR struct igmp_group_s *)dev->d_igmp_grplist.head;
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for (; member; member = member->next)
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{
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/* Skip over the all systems group entry */
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if (!net_ipv4addr_cmp(member->grpaddr,
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g_ipv4_allsystems))
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{
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ticks = net_dsec2tick((int)igmp->maxresp);
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if (IS_IDLEMEMBER(member->flags) ||
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igmp_cmptimer(member, ticks))
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{
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igmp_startticks(member, ticks);
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CLR_IDLEMEMBER(member->flags);
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}
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}
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}
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}
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else /* if (net_ipv4addr_cmp(igmp->grpaddr, INADDR_ANY) == 0) */
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{
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ninfo("Group-specific multicast query\n");
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/* We first need to re-lookup the group since we used dest
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* last time. Use the incoming IPaddress!
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*/
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IGMP_STATINCR(g_netstats.igmp.ucast_query);
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grpaddr = net_ip4addr_conv32(igmp->grpaddr);
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group = igmp_grpallocfind(dev, &grpaddr);
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if (group != NULL)
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{
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ticks = net_dsec2tick((int)igmp->maxresp);
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if (IS_IDLEMEMBER(group->flags) ||
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igmp_cmptimer(group, ticks))
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{
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igmp_startticks(group, ticks);
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CLR_IDLEMEMBER(group->flags);
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}
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}
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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 (net_ipv4addr_cmp(igmp->grpaddr, INADDR_ANY) == 0)
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{
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ninfo("Unicast query\n");
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IGMP_STATINCR(g_netstats.igmp.ucast_query);
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ninfo("Query to a specific group with the group address as "
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"destination\n");
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ticks = net_dsec2tick((int)igmp->maxresp);
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if (IS_IDLEMEMBER(group->flags) || igmp_cmptimer(group, ticks))
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{
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igmp_startticks(group, ticks);
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CLR_IDLEMEMBER(group->flags);
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}
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}
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break;
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case IGMPv2_MEMBERSHIP_REPORT:
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{
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ninfo("Membership report\n");
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IGMP_STATINCR(g_netstats.igmp.report_received);
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if (!IS_IDLEMEMBER(group->flags))
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{
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/* This is on a specific group we have already looked up */
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wd_cancel(&group->wdog);
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SET_IDLEMEMBER(group->flags);
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CLR_LASTREPORT(group->flags);
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}
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}
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break;
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default:
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{
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nwarn("WARNING: Unexpected msg %02x\n", igmp->type);
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}
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break;
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}
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drop:
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dev->d_len = 0;
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}
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#endif /* CONFIG_NET_IGMP */
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