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Resync new repository with old repo r5166
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
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/****************************************************************************
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* net/uip/uip_icmpinput.c
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* Handling incoming ICMP/ICMP6 input
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*
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* Copyright (C) 2007-2009, 2012 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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#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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#include <nuttx/net/uip/uipopt.h>
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#include <nuttx/net/uip/uip.h>
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#include <nuttx/net/uip/uip-arch.h>
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#include "uip_internal.h"
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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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#define ICMPBUF ((struct uip_icmpip_hdr *)&dev->d_buf[UIP_LLH_LEN])
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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#ifdef CONFIG_NET_ICMP_PING
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struct uip_callback_s *g_echocallback = NULL;
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#endif
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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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* Name: uip_icmpinput
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*
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* Description:
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* Handle incoming ICMP/ICMP6 input
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*
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* Parameters:
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* dev - The device driver structure containing the received ICMP/ICMP6
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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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void uip_icmpinput(struct uip_driver_s *dev)
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{
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struct uip_icmpip_hdr *picmp = ICMPBUF;
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#ifdef CONFIG_NET_STATISTICS
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uip_stat.icmp.recv++;
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#endif
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#ifndef CONFIG_NET_IPv6
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/* ICMPv4 processing code follows. */
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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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uiphdr_ipaddr_copy(picmp->destipaddr, picmp->srcipaddr);
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uiphdr_ipaddr_copy(picmp->srcipaddr, &dev->d_ipaddr);
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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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picmp->icmpchksum = ~uip_icmpchksum(dev, (((uint16_t)picmp->len[0] << 8) | (uint16_t)picmp->len[1]) - UIP_IPH_LEN);
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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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uip_stat.icmp.sent++;
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uip_stat.ip.sent++;
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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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else if (picmp->type == ICMP_ECHO_REPLY && g_echocallback)
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{
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(void)uip_callbackexecute(dev, picmp, UIP_ECHOREPLY, g_echocallback);
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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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uip_stat.icmp.typeerr++;
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uip_stat.icmp.drop++;
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#endif
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dev->d_len = 0;
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#else /* !CONFIG_NET_IPv6 */
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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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if (picmp->type == ICMP6_NEIGHBOR_SOLICITATION)
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{
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if (uip_ipaddr_cmp(picmp->icmp6data, dev->d_ipaddr))
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{
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if (picmp->options[0] == ICMP6_OPTION_SOURCE_LINK_ADDRESS)
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{
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/* Save the sender's address in our neighbor list. */
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uiphdr_neighbor_add(picmp->srcipaddr, &(picmp->options[2]));
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}
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/* We should now send a neighbor advertisement back to where the
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* neighbor solicication came from.
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*/
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picmp->type = ICMP6_NEIGHBOR_ADVERTISEMENT;
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picmp->flags = ICMP6_FLAG_S; /* Solicited flag. */
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picmp->reserved1 = picmp->reserved2 = picmp->reserved3 = 0;
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uiphdr_ipaddr_copy(picmp->destipaddr, picmp->srcipaddr);
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uiphdr_ipaddr_copy(picmp->srcipaddr, &dev->d_ipaddr);
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picmp->options[0] = ICMP6_OPTION_TARGET_LINK_ADDRESS;
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picmp->options[1] = 1; /* Options length, 1 = 8 bytes. */
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memcpy(&(picmp->options[2]), &dev->d_mac, IFHWADDRLEN);
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picmp->icmpchksum = 0;
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picmp->icmpchksum = ~uip_icmp6chksum(dev);
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}
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else
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{
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goto drop;
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}
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}
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else if (picmp->type == ICMP6_ECHO_REQUEST)
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{
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/* ICMP echo (i.e., ping) processing. This is simple, we only
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* change the ICMP type from ECHO to ECHO_REPLY and update the
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* ICMP checksum before we return the packet.
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*/
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picmp->type = ICMP6_ECHO_REPLY;
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uiphdr_ipaddr_copy(picmp->destipaddr, picmp->srcipaddr);
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uiphdr_ipaddr_copy(picmp->srcipaddr, &dev->d_ipaddr);
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picmp->icmpchksum = 0;
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picmp->icmpchksum = ~uip_icmp6chksum(dev);
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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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else if (picmp->type == ICMP6_ECHO_REPLY && g_echocallback)
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{
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uint16_t flags = UIP_ECHOREPLY;
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if (g_echocallback)
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{
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/* Dispatch the ECHO reply to the waiting thread */
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flags = uip_callbackexecute(dev, picmp, flags, g_echocallback);
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}
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/* If the ECHO reply was not handled, then drop the packet */
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if (flags == UIP_ECHOREPLY)
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{
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/* The ECHO reply was not handled */
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goto drop;
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}
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}
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#endif
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else
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{
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nlldbg("Unknown ICMP6 cmd: %d\n", picmp->type);
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goto typeerr;
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}
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nllvdbg("Outgoing ICMP6 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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uip_stat.icmp.sent++;
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uip_stat.ip.sent++;
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#endif
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return;
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typeerr:
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#ifdef CONFIG_NET_STATISTICS
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uip_stat.icmp.typeerr++;
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#endif
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drop:
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#ifdef CONFIG_NET_STATISTICS
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uip_stat.icmp.drop++;
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#endif
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dev->d_len = 0;
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#endif /* !CONFIG_NET_IPv6 */
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}
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#endif /* CONFIG_NET_ICMP */
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#endif /* CONFIG_NET */
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