509 lines
15 KiB
C
509 lines
15 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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* Copyright (C) 2015, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Adapted for NuttX from logic in uIP which also has a BSD-like license:
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*
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* Original author Adam Dunkels <adam@dunkels.com>
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* Copyright () 2001-2003, Adam Dunkels.
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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. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF 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 <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 "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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#ifdef CONFIG_NET_ICMPv6
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ETHBUF \
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((struct eth_hdr_s *)&dev->d_buf[0])
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#define IPv6BUF \
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((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define IPICMPv6 \
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((struct icmpv6_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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#define ICMPv6REPLY \
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((FAR struct icmpv6_echo_reply_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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#define ICMPv6SIZE \
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((dev)->d_len - IPv6_HDRLEN)
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#define ICMPv6SOLICIT \
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((struct icmpv6_neighbor_solicit_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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#define ICMPv6ADVERTISE \
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((struct icmpv6_neighbor_advertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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#define ICMPv6RADVERTISE \
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((struct icmpv6_router_advertise_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
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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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{
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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 offset;
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uint16_t buflen;
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uint8_t addrsize;
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int ret;
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/* Try to allocate on I/O buffer to start the chain without waiting (and
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* throttling as necessary). If we would have to wait, then drop the
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* packet.
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*/
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iob = iob_tryalloc(true);
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if (iob == NULL)
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{
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nerr("ERROR: Failed to create new I/O buffer chain\n");
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goto drop;
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}
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/* Put the IPv6 address at the beginning of the read-ahead buffer */
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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 I/O buffer chain. We will not wait
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* for an I/O buffer to become available in this context. It there is
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* any failure to allocated, the entire I/O buffer chain will be discarded.
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*/
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addrsize = sizeof(struct sockaddr_in6);
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ret = iob_trycopyin(iob, &addrsize, sizeof(uint8_t), 0, true);
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if (ret < 0)
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{
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/* On a failure, iob_trycopyin return a negated error value but does
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* not free any I/O buffers.
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*/
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nerr("ERROR: Failed to length to the I/O buffer chain: %d\n", ret);
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goto drop_with_chain;
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}
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offset = sizeof(uint8_t);
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ret = iob_trycopyin(iob, (FAR const uint8_t *)&inaddr,
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sizeof(struct sockaddr_in6), offset, true);
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if (ret < 0)
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{
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/* On a failure, iob_trycopyin return a negated error value but does
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* not free any I/O buffers.
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*/
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nerr("ERROR: Failed to source address to the I/O buffer chain: %d\n", ret);
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goto drop_with_chain;
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}
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offset += 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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ret = iob_trycopyin(iob, (FAR uint8_t *)ICMPv6REPLY, buflen, offset, true);
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if (ret < 0)
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{
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/* On a failure, iob_copyin return a negated error value but does
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* not free any I/O buffers.
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*/
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nerr("ERROR: Failed to add data to the I/O buffer chain: %d\n", ret);
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goto drop_with_chain;
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}
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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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goto drop_with_chain;
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}
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ninfo("Buffered %d bytes\n", buflen + addrsize + 1);
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dev->d_len = 0;
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return buflen;
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drop_with_chain:
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(void)iob_free_chain(iob);
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drop:
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dev->d_len = 0;
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return 0;
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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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*
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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)
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{
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FAR struct icmpv6_iphdr_s *ipicmp = IPICMPv6;
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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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/* Handle the ICMPv6 message by its type */
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switch (ipicmp->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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/* 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, ipicmp->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 [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(ipicmp->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, ipicmp->srcipaddr, adv->tgtlladdr);
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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(ipicmp->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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}
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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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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)ipicmp->len[0] << 8 | ipicmp->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 + sizeof(struct icmpv6_router_advertise_s);
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for (ndx = 0; ndx + sizeof(struct icmpv6_prefixinfo_s) <= optlen; )
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{
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FAR struct icmpv6_srclladdr_s *sllopt =
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(FAR struct icmpv6_srclladdr_s *)&options[ndx];
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if (sllopt->opttype == 1 && sllopt->optlen == 1)
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{
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neighbor_add(dev, ipicmp->srcipaddr, sllopt->srclladdr);
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}
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FAR struct icmpv6_prefixinfo_s *opt =
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(FAR struct icmpv6_prefixinfo_s *)&options[ndx];
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/* Is this the sought for prefix? Is it the correct size? Is
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* the "A" flag set?
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*/
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if (opt->opttype &&
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opt->optlen == 4 &&
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(opt->flags & ICMPv6_PRFX_FLAG_A) != 0)
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{
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/* Yes.. Notify any waiting threads */
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icmpv6_rnotify(dev, ipicmp->srcipaddr, opt->prefix, opt->preflen);
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goto icmpv6_send_nothing;
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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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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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ipicmp->type = ICMPv6_ECHO_REPLY;
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net_ipv6addr_copy(ipicmp->destipaddr, ipicmp->srcipaddr);
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net_ipv6addr_copy(ipicmp->srcipaddr, dev->d_ipv6addr);
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ipicmp->chksum = 0;
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ipicmp->chksum = ~icmpv6_chksum(dev);
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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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uint16_t flags = ICMPv6_ECHOREPLY;
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/* Dispatch the ECHO reply to the waiting thread */
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flags = devif_conn_event(dev, NULL, flags, dev->d_conncb);
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/* Was the ECHO reply consumed by any waiting thread? */
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if ((flags & ICMPv6_ECHOREPLY) != 0)
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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 nbuffered;
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/* Nothing consumed the ICMP reply. That might 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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/* 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);
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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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default:
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{
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nwarn("WARNING: Unknown ICMPv6 type: %d\n", ipicmp->type);
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goto icmpv6_type_error;
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}
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}
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ninfo("Outgoing ICMPv6 packet length: %d (%d)\n",
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dev->d_len, (ipicmp->len[0] << 8) | ipicmp->len[1]);
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.sent++;
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g_netstats.ipv6.sent++;
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#endif
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return;
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icmpv6_type_error:
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.typeerr++;
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#endif
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icmpv6_drop_packet:
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#ifdef CONFIG_NET_STATISTICS
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g_netstats.icmpv6.drop++;
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#endif
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icmpv6_send_nothing:
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dev->d_len = 0;
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}
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#endif /* CONFIG_NET_ICMPv6 */
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