592 lines
17 KiB
C
592 lines
17 KiB
C
/****************************************************************************
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* net/icmpv6/icmpv6_input.c
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* Handling incoming ICMPv6 input
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <stdint.h>
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#include <string.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include <nuttx/net/netstats.h>
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#include <nuttx/net/icmpv6.h>
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#include <nuttx/net/dns.h>
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#include "devif/devif.h"
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#include "neighbor/neighbor.h"
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#include "utils/utils.h"
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#include "icmpv6/icmpv6.h"
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#include "mld/mld.h"
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#ifdef CONFIG_NET_ICMPv6
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ICMPv6REPLY ((FAR struct icmpv6_echo_reply_s *)icmpv6)
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#define ICMPv6SIZE ((dev)->d_len - iplen)
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#define ICMPv6SOLICIT ((FAR struct icmpv6_neighbor_solicit_s *)icmpv6)
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#define ICMPv6ADVERTISE ((FAR struct icmpv6_neighbor_advertise_s *)icmpv6)
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#define ICMPv6RADVERTISE ((FAR struct icmpv6_router_advertise_s *)icmpv6)
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#define MLDQUERY ((FAR struct mld_mcast_listen_query_s *)icmpv6)
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#define MLDREPORT_V1 ((FAR struct mld_mcast_listen_report_v1_s *)icmpv6)
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#define MLDREPORT_V2 ((FAR struct mld_mcast_listen_report_v2_s *)icmpv6)
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#define MLDDONE ((FAR struct mld_mcast_listen_done_s *)icmpv6)
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_datahandler
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*
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* Description:
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* Handle ICMPv6 echo replies that are not accepted by the application.
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*
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* Input Parameters:
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* dev - Device instance only the input packet in d_buf, length = d_len;
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* conn - A pointer to the ICMPv6 connection structure
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* buffer - A pointer to the buffer to be copied to the read-ahead
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* buffers
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* buflen - The number of bytes to copy to the read-ahead buffer.
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*
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* Returned Value:
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* The number of bytes actually buffered is returned. This will be either
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* zero or equal to buflen; partial packets are not buffered.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_ICMPv6_SOCKET
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static uint16_t icmpv6_datahandler(FAR struct net_driver_s *dev,
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FAR struct icmpv6_conn_s *conn,
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unsigned int iplen)
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{
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FAR struct ipv6_hdr_s *ipv6;
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struct sockaddr_in6 inaddr;
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FAR struct iob_s *iob;
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uint16_t buflen;
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int ret;
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/* Put the IPv6 address at the beginning of the read-ahead buffer */
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iob = dev->d_iob;
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ipv6 = IPv6BUF;
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inaddr.sin6_family = AF_INET6;
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inaddr.sin6_port = 0;
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net_ipv6addr_copy(inaddr.sin6_addr.s6_addr16, ipv6->srcipaddr);
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/* Copy the src address info into the front of I/O buffer chain which
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* overwrites the contents of the packet header field.
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*/
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memcpy(iob->io_data, &inaddr, sizeof(struct sockaddr_in6));
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/* Copy the new ICMPv6 reply into the I/O buffer chain (without waiting) */
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buflen = ICMPv6SIZE;
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/* Trim l3 header */
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iob = iob_trimhead(iob, iplen);
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/* Add the new I/O buffer chain to the tail of the read-ahead queue (again
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* without waiting).
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*/
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ret = iob_tryadd_queue(iob, &conn->readahead);
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if (ret < 0)
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{
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nerr("ERROR: Failed to queue the I/O buffer chain: %d\n", ret);
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iob_free_chain(iob);
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}
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else
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{
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ninfo("Buffered %d bytes\n", buflen);
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}
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/* Device buffer must be enqueue or freed, clear the handle */
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netdev_iob_clear(dev);
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return buflen;
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: icmpv6_input
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*
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* Description:
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* Handle incoming ICMPv6 input
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*
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* Input Parameters:
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* dev - The device driver structure containing the received ICMPv6
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* packet
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* iplen - The size of the IPv6 header. This may be larger than
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* IPv6_HDRLEN the IPv6 header if IPv6 extension headers are
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* present.
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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 icmpv6_input(FAR struct net_driver_s *dev, unsigned int iplen)
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{
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FAR struct ipv6_hdr_s *ipv6 = IPv6BUF;
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FAR struct icmpv6_hdr_s *icmpv6 = IPBUF(iplen);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.recv++;
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#endif
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/* REVISIT:
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* - Verify that the message length is valid.
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* - Verify the ICMPv6 checksum
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*/
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/* Handle the ICMPv6 message by its type */
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switch (icmpv6->type)
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{
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/* If we get a neighbor solicitation for our address we should send
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* a neighbor advertisement message back.
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*/
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case ICMPv6_NEIGHBOR_SOLICIT:
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{
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FAR struct icmpv6_neighbor_solicit_s *sol;
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/* Check if we are the target of the solicitation */
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sol = ICMPv6SOLICIT;
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if (net_ipv6addr_cmp(sol->tgtaddr, dev->d_ipv6addr))
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{
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if (sol->opttype == ICMPv6_OPT_SRCLLADDR)
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{
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/* Save the sender's address mapping in our Neighbor Table. */
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neighbor_add(dev, ipv6->srcipaddr, sol->srclladdr);
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}
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/* Yes.. Send a neighbor advertisement back to where the neighbor
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* solicitation came from.
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*/
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icmpv6_advertise(dev, ipv6->srcipaddr);
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/* All statistics have been updated. Nothing to do but exit. */
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return;
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}
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else
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{
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goto icmpv6_drop_packet;
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}
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}
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break;
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/* Check if we received a Neighbor Advertisement */
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case ICMPv6_NEIGHBOR_ADVERTISE:
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{
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FAR struct icmpv6_neighbor_advertise_s *adv;
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/* If the IPv6 destination address matches our address, and if so,
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* add the neighbor address mapping to the list of neighbors.
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*
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* Missing checks:
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* optlen = 1 (8 octets)
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* Should only update Neighbor Table if
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* [O]verride bit is set in flags
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*/
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adv = ICMPv6ADVERTISE;
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if (net_ipv6addr_cmp(ipv6->destipaddr, dev->d_ipv6addr))
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{
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/* This message is required to support the Target link-layer
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* address option.
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*/
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if (adv->opttype == ICMPv6_OPT_TGTLLADDR)
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{
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/* Save the sender's address mapping in our Neighbor Table. */
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neighbor_add(dev, ipv6->srcipaddr, adv->tgtlladdr);
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}
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#ifdef CONFIG_NET_ICMPv6_NEIGHBOR
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/* Then notify any logic waiting for the Neighbor Advertisement */
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icmpv6_notify(ipv6->srcipaddr);
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#endif
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/* We consumed the packet but we don't send anything in
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* response.
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*/
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goto icmpv6_send_nothing;
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}
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goto icmpv6_drop_packet;
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}
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break;
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#ifdef CONFIG_NET_ICMPv6_ROUTER
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/* Check if we received a Router Solicitation */
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case ICMPV6_ROUTER_SOLICIT:
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{
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/* Just give a knee-jerk Router Advertisement in respond with no
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* further examination of the Router Solicitation.
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*/
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icmpv6_radvertise(dev);
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/* All statistics have been updated. Nothing to do but exit. */
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return;
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}
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#endif
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#ifdef CONFIG_NET_ICMPv6_AUTOCONF
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/* Check if we received a Router Advertisement */
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case ICMPV6_ROUTER_ADVERTISE:
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{
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FAR struct icmpv6_router_advertise_s *adv;
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FAR uint8_t *options;
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bool prefix = false;
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uint16_t pktlen;
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uint16_t optlen;
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int ndx;
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/* Get the length of the option data */
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pktlen = (uint16_t)ipv6->len[0] << 8 | ipv6->len[1];
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if (pktlen <= ICMPv6_RADV_MINLEN)
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{
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/* Too small to contain any options */
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goto icmpv6_drop_packet;
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}
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optlen = ICMPv6_RADV_OPTLEN(pktlen);
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/* We need to have a valid router advertisement with a Prefix and
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* with the "A" bit set in the flags. Options immediately follow
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* the ICMPv6 router advertisement.
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*/
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adv = ICMPv6RADVERTISE;
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options = (FAR uint8_t *)adv +
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sizeof(struct icmpv6_router_advertise_s);
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for (ndx = 0; ndx < optlen; )
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{
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FAR struct icmpv6_generic_s *opt =
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(FAR struct icmpv6_generic_s *)&options[ndx];
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switch (opt->opttype)
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{
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case ICMPv6_OPT_SRCLLADDR:
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{
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FAR struct icmpv6_srclladdr_s *sllopt =
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(FAR struct icmpv6_srclladdr_s *)opt;
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neighbor_add(dev, ipv6->srcipaddr, sllopt->srclladdr);
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}
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break;
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case ICMPv6_OPT_PREFIX:
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{
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FAR struct icmpv6_prefixinfo_s *prefixopt =
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(FAR struct icmpv6_prefixinfo_s *)opt;
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/* Is the "A" flag set? */
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if ((prefixopt->flags & ICMPv6_PRFX_FLAG_A) != 0)
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{
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/* Yes.. Set the new network addresses. */
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icmpv6_setaddresses(dev, ipv6->srcipaddr,
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prefixopt->prefix, prefixopt->preflen);
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/* Notify any waiting threads */
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icmpv6_rnotify(dev);
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prefix = true;
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}
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}
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break;
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case ICMPv6_OPT_MTU:
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{
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FAR struct icmpv6_mtu_s *mtuopt =
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(FAR struct icmpv6_mtu_s *)opt;
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dev->d_pktsize = NTOHS(mtuopt->mtu[1]) + dev->d_llhdrlen;
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}
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break;
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#ifdef CONFIG_ICMPv6_AUTOCONF_RDNSS
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case ICMPv6_OPT_RDNSS:
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{
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FAR struct icmpv6_rdnss_s *rdnss =
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(FAR struct icmpv6_rdnss_s *)opt;
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FAR struct in6_addr *servers;
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struct sockaddr_in6 addr;
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int nservers;
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int ret;
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int i;
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if (rdnss->optlen < 3)
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{
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nerr("rdnss error length %d\n", rdnss->optlen);
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break;
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}
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/* optlen is in units of 8 bytes. The header is 1 unit
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* (8 bytes) and each address is another 2 units
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* (16 bytes). So the number of addresses is equal to
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* (optlen - 1) / 2.
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*/
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servers = (FAR struct in6_addr *)rdnss->servers;
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nservers = (rdnss->optlen - 1) / 2;
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/* Set the IPv6 DNS server address */
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memset(&addr, 0, sizeof(addr));
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addr.sin6_family = AF_INET6;
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for (i = 0; i < CONFIG_NETDB_DNSSERVER_NAMESERVERS &&
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i < nservers; i++)
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{
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net_ipv6addr_copy(&addr.sin6_addr, servers + i);
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ret = dns_add_nameserver(
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(FAR const struct sockaddr *)&addr,
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sizeof(struct sockaddr_in6));
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if (ret < 0 && ret != -EEXIST)
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{
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nerr("dns add nameserver failed %d", ret);
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}
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}
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}
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break;
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#endif
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default:
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break;
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}
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/* Skip to the next option (units of octets) */
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ndx += (opt->optlen << 3);
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}
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if (prefix)
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{
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goto icmpv6_send_nothing;
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}
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goto icmpv6_drop_packet;
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}
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break;
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#endif
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/* Handle the ICMPv6 Echo Request */
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case ICMPv6_ECHO_REQUEST:
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{
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/* ICMPv6 echo (i.e., ping) processing. This is simple, we only
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* change the ICMPv6 type from ECHO to ECHO_REPLY and update the
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* ICMPv6 checksum before we return the packet.
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*/
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icmpv6->type = ICMPv6_ECHO_REPLY;
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net_ipv6addr_copy(ipv6->destipaddr, ipv6->srcipaddr);
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net_ipv6addr_copy(ipv6->srcipaddr, dev->d_ipv6addr);
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icmpv6->chksum = 0;
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icmpv6->chksum = ~icmpv6_chksum(dev, iplen);
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}
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break;
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#ifdef CONFIG_NET_ICMPv6_SOCKET
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/* If an ICMPv6 echo reply is received then there should also be
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* a thread waiting to received the echo response.
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*/
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case ICMPv6_ECHO_REPLY:
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{
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FAR struct icmpv6_echo_reply_s *reply;
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FAR struct icmpv6_conn_s *conn;
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uint16_t flags = ICMPv6_NEWDATA;
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/* Nothing consumed the ICMP reply. That might be because this is
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* an old, invalid reply or simply because the ping application
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* has not yet put its poll or recv in place.
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*/
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/* Is there any connection that might expect this reply? */
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reply = ICMPv6REPLY;
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conn = icmpv6_findconn(dev, reply->id);
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if (conn == NULL)
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{
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/* No.. drop the packet */
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goto icmpv6_drop_packet;
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}
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/* Dispatch the ECHO reply to the waiting thread */
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flags = devif_conn_event(dev, flags, conn->sconn.list);
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/* Was the ECHO reply consumed by any waiting thread? */
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if ((flags & ICMPv6_NEWDATA) != 0)
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{
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uint16_t nbuffered;
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/* Yes.. Add the ICMP echo reply to the IPPROTO_ICMP socket read
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* ahead buffer.
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*/
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nbuffered = icmpv6_datahandler(dev, conn, iplen);
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if (nbuffered == 0)
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{
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/* Could not buffer the data.. drop the packet */
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goto icmpv6_drop_packet;
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}
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}
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goto icmpv6_send_nothing;
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}
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break;
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#endif
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#ifdef CONFIG_NET_MLD
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/* Dispatch received Multicast Listener Discovery (MLD) packets. */
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case ICMPV6_MCAST_LISTEN_QUERY: /* Multicast Listener Query, RFC 2710 and RFC 3810 */
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{
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FAR struct mld_mcast_listen_query_s *query = MLDQUERY;
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int ret;
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ret = mld_query(dev, query);
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if (ret < 0)
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{
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goto icmpv6_drop_packet;
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}
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}
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break;
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case ICMPV6_MCAST_LISTEN_REPORT_V1: /* Version 1 Multicast Listener Report, RFC 2710 */
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{
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FAR struct mld_mcast_listen_report_v1_s *report = MLDREPORT_V1;
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int ret;
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ret = mld_report_v1(dev, report);
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if (ret < 0)
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{
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goto icmpv6_drop_packet;
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}
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}
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break;
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case ICMPV6_MCAST_LISTEN_REPORT_V2: /* Version 2 Multicast Listener Report, RFC 3810 */
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{
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FAR struct mld_mcast_listen_report_v2_s *report = MLDREPORT_V2;
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int ret;
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ret = mld_report_v2(dev, report);
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if (ret < 0)
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{
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goto icmpv6_drop_packet;
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}
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}
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break;
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case ICMPV6_MCAST_LISTEN_DONE: /* Multicast Listener Done, RFC 2710 */
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{
|
|
FAR struct mld_mcast_listen_done_s *done = MLDDONE;
|
|
int ret;
|
|
|
|
ret = mld_done(dev, done);
|
|
if (ret < 0)
|
|
{
|
|
goto icmpv6_drop_packet;
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
{
|
|
nwarn("WARNING: Unknown ICMPv6 type: %d\n", icmpv6->type);
|
|
goto icmpv6_type_error;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
if (dev->d_len > 0)
|
|
{
|
|
ninfo("Outgoing ICMPv6 packet length: %d (%d)\n",
|
|
dev->d_len, (ipv6->len[0] << 8) | ipv6->len[1]);
|
|
|
|
g_netstats.icmpv6.sent++;
|
|
g_netstats.ipv6.sent++;
|
|
}
|
|
#endif
|
|
|
|
return;
|
|
|
|
icmpv6_type_error:
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
g_netstats.icmpv6.typeerr++;
|
|
#endif
|
|
|
|
icmpv6_drop_packet:
|
|
#ifdef CONFIG_NET_STATISTICS
|
|
g_netstats.icmpv6.drop++;
|
|
#endif
|
|
|
|
icmpv6_send_nothing:
|
|
dev->d_len = 0;
|
|
}
|
|
|
|
#endif /* CONFIG_NET_ICMPv6 */
|