2014-05-30 21:32:10 +02:00
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/****************************************************************************
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* net/icmp/icmp_input.c
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2015-01-14 23:10:38 +01:00
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* Handling incoming ICMP input
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2014-05-30 21:32:10 +02:00
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*
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2015-01-14 21:47:40 +01:00
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* Copyright (C) 2007-2009, 2012, 2014-2015 Gregory Nutt. All rights reserved.
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2014-05-30 21:32:10 +02:00
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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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#ifdef CONFIG_NET
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#include <stdint.h>
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#include <debug.h>
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#include <net/if.h>
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2014-07-05 03:13:08 +02:00
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#include <arpa/inet.h>
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2014-06-24 16:53:28 +02:00
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#include <nuttx/net/netconfig.h>
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2014-06-24 17:28:44 +02:00
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#include <nuttx/net/netdev.h>
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2014-06-26 17:32:39 +02:00
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#include <nuttx/net/netstats.h>
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2014-07-05 03:13:08 +02:00
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#include <nuttx/net/ip.h>
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2014-05-30 21:32:10 +02:00
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2014-06-29 02:07:02 +02:00
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#include "devif/devif.h"
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2014-06-25 17:12:47 +02:00
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#include "icmp/icmp.h"
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2014-06-28 01:51:32 +02:00
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#include "utils/utils.h"
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2014-05-30 21:32:10 +02:00
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#ifdef CONFIG_NET_ICMP
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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2014-11-15 20:13:23 +01:00
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#define ICMPBUF ((struct icmp_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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2014-05-30 21:32:10 +02:00
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/****************************************************************************
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2015-05-27 17:26:00 +02:00
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* Public Data
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2014-05-30 21:32:10 +02:00
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****************************************************************************/
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/****************************************************************************
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2015-05-27 17:26:00 +02:00
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* Private Data
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2014-05-30 21:32:10 +02:00
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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2014-06-25 17:12:47 +02:00
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* Name: icmp_input
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2014-05-30 21:32:10 +02:00
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*
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* Description:
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2015-01-14 23:10:38 +01:00
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* Handle incoming ICMP input
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2014-05-30 21:32:10 +02:00
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*
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* Parameters:
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2015-01-14 23:10:38 +01:00
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* dev - The device driver structure containing the received ICMP
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2014-05-30 21:32:10 +02:00
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* packet
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*
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* Return:
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* None
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*
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* Assumptions:
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* Called from the interrupt level or with interrupts disabled.
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*
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****************************************************************************/
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2014-06-28 00:48:12 +02:00
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void icmp_input(FAR struct net_driver_s *dev)
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2014-05-30 21:32:10 +02:00
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{
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2014-06-25 17:12:47 +02:00
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FAR struct icmp_iphdr_s *picmp = ICMPBUF;
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2014-05-30 21:32:10 +02:00
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#ifdef CONFIG_NET_STATISTICS
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2014-06-26 17:32:39 +02:00
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g_netstats.icmp.recv++;
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2014-05-30 21:32:10 +02:00
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#endif
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/* ICMP echo (i.e., ping) processing. This is simple, we only change the
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* ICMP type from ECHO to ECHO_REPLY and adjust the ICMP checksum before
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* we return the packet.
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*/
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if (picmp->type == ICMP_ECHO_REQUEST)
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{
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/* If we are configured to use ping IP address assignment, we use
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* the destination IP address of this ping packet and assign it to
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* ourself.
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*/
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#ifdef CONFIG_NET_PINGADDRCONF
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if (dev->d_ipaddr == 0)
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{
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dev->d_ipaddr = picmp->destipaddr;
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}
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#endif
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/* Change the ICMP type */
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picmp->type = ICMP_ECHO_REPLY;
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/* Swap IP addresses. */
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2015-01-15 19:19:44 +01:00
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net_ipv4addr_hdrcopy(picmp->destipaddr, picmp->srcipaddr);
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net_ipv4addr_hdrcopy(picmp->srcipaddr, &dev->d_ipaddr);
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2014-05-30 21:32:10 +02:00
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/* Recalculate the ICMP checksum */
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#if 0
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/* The slow way... sum over the ICMP message */
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picmp->icmpchksum = 0;
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2015-01-14 23:10:38 +01:00
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picmp->icmpchksum = ~icmp_chksum(dev, (((uint16_t)picmp->len[0] << 8) | (uint16_t)picmp->len[1]) - IPv4_HDRLEN);
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2014-05-30 21:32:10 +02:00
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if (picmp->icmpchksum == 0)
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{
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picmp->icmpchksum = 0xffff;
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}
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#else
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/* The quick way -- Since only the type has changed, just adjust the
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* checksum for the change of type
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*/
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if (picmp->icmpchksum >= HTONS(0xffff - (ICMP_ECHO_REQUEST << 8)))
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{
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picmp->icmpchksum += HTONS(ICMP_ECHO_REQUEST << 8) + 1;
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}
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else
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{
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picmp->icmpchksum += HTONS(ICMP_ECHO_REQUEST << 8);
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}
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#endif
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nllvdbg("Outgoing ICMP packet length: %d (%d)\n",
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dev->d_len, (picmp->len[0] << 8) | picmp->len[1]);
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#ifdef CONFIG_NET_STATISTICS
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2014-06-26 17:32:39 +02:00
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g_netstats.icmp.sent++;
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2015-01-24 15:26:12 +01:00
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g_netstats.ipv4.sent++;
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2014-05-30 21:32:10 +02:00
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#endif
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}
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/* If an ICMP 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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#ifdef CONFIG_NET_ICMP_PING
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2015-05-28 20:01:38 +02:00
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else if (picmp->type == ICMP_ECHO_REPLY && dev->d_conncb)
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2014-05-30 21:32:10 +02:00
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{
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2015-05-28 20:01:38 +02:00
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(void)devif_conn_event(dev, picmp, ICMP_ECHOREPLY, dev->d_conncb);
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2014-05-30 21:32:10 +02:00
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}
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#endif
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/* Otherwise the ICMP input was not processed */
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else
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{
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nlldbg("Unknown ICMP cmd: %d\n", picmp->type);
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goto typeerr;
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}
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return;
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typeerr:
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#ifdef CONFIG_NET_STATISTICS
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2014-06-26 17:32:39 +02:00
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g_netstats.icmp.typeerr++;
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g_netstats.icmp.drop++;
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2014-05-30 21:32:10 +02:00
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#endif
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dev->d_len = 0;
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}
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#endif /* CONFIG_NET_ICMP */
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#endif /* CONFIG_NET */
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