155 lines
5.4 KiB
C
155 lines
5.4 KiB
C
/****************************************************************************
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* net/icmp/icmp_send.c
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*
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* Copyright (C) 2008-2010, 2012, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* 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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#if defined(CONFIG_NET) && defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_PING)
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#include <debug.h>
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#include <arpa/inet.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/ip.h>
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#include "devif/devif.h"
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#include "utils/utils.h"
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#include "icmp/icmp.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define ICMPBUF ((struct icmp_iphdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
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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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/****************************************************************************
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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: icmp_send
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*
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* Description:
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* Setup to send an ICMP packet
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*
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* Parameters:
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* dev - The device driver structure to use in the send operation
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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 icmp_send(FAR struct net_driver_s *dev, FAR in_addr_t *destaddr)
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{
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FAR struct icmp_iphdr_s *picmp = ICMPBUF;
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if (dev->d_sndlen > 0)
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{
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/* The total length to send is the size of the application data plus
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* the IP and ICMP headers (and, eventually, the Ethernet header)
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*/
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dev->d_len = dev->d_sndlen + IPICMP_HDRLEN;
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/* The total size of the data (for ICMP checksum calculation) includes
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* the size of the ICMP header
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*/
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dev->d_sndlen += ICMP_HDRLEN;
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/* Initialize the IP header. */
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picmp->vhl = 0x45;
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picmp->tos = 0;
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picmp->len[0] = (dev->d_len >> 8);
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picmp->len[1] = (dev->d_len & 0xff);
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++g_ipid;
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picmp->ipid[0] = g_ipid >> 8;
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picmp->ipid[1] = g_ipid & 0xff;
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picmp->ipoffset[0] = IP_FLAG_DONTFRAG >> 8;
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picmp->ipoffset[1] = IP_FLAG_DONTFRAG & 0xff;
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picmp->ttl = IP_TTL;
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picmp->proto = IP_PROTO_ICMP;
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net_ipv4addr_hdrcopy(picmp->srcipaddr, &dev->d_ipaddr);
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net_ipv4addr_hdrcopy(picmp->destipaddr, destaddr);
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/* Calculate IP checksum. */
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picmp->ipchksum = 0;
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picmp->ipchksum = ~(ipv4_chksum(dev));
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/* Calculate the ICMP checksum. */
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picmp->icmpchksum = 0;
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picmp->icmpchksum = ~(icmp_chksum(dev, dev->d_sndlen));
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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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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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g_netstats.icmp.sent++;
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g_netstats.ip.sent++;
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#endif
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}
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}
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#endif /* CONFIG_NET && CONFIG_NET_ICMP && CONFIG_NET_ICMP_PING */
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