nuttx/net/icmp/icmp_send.c
2014-06-27 17:51:32 -06:00

172 lines
5.9 KiB
C

/****************************************************************************
* net/icmp/icmp_send.c
*
* Copyright (C) 2008-2010, 2012, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#if defined(CONFIG_NET) && defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_PING)
#include <debug.h>
#include <nuttx/net/netconfig.h>
#include <nuttx/net/uip.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/netstats.h>
#include "uip/uip.h"
#include "utils/utils.h"
#include "icmp/icmp.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define ICMPBUF ((struct icmp_iphdr_s *)&dev->d_buf[UIP_LLH_LEN])
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: icmp_send
*
* Description:
* Setup to send an ICMP packet
*
* Parameters:
* dev - The device driver structure to use in the send operation
*
* Return:
* None
*
* Assumptions:
* Called from the interrupt level or with interrupts disabled.
*
****************************************************************************/
void icmp_send(FAR struct net_driver_s *dev, FAR uip_ipaddr_t *destaddr)
{
FAR struct icmp_iphdr_s *picmp = ICMPBUF;
if (dev->d_sndlen > 0)
{
/* The total length to send is the size of the application data plus
* the IP and ICMP headers (and, eventually, the Ethernet header)
*/
dev->d_len = dev->d_sndlen + UIP_IPICMPH_LEN;
/* The total size of the data (for ICMP checksum calculation) includes
* the size of the ICMP header
*/
dev->d_sndlen += UIP_ICMPH_LEN;
/* Initialize the IP header. Note that for IPv6, the IP length field
* does not include the IPv6 IP header length.
*/
#ifdef CONFIG_NET_IPv6
picmp->vtc = 0x60;
picmp->tcf = 0x00;
picmp->flow = 0x00;
picmp->len[0] = (dev->d_sndlen >> 8);
picmp->len[1] = (dev->d_sndlen & 0xff);
picmp->nexthdr = UIP_PROTO_ICMP;
picmp->hoplimit = UIP_TTL;
uip_ipaddr_copy(picmp->srcipaddr, &dev->d_ipaddr);
uip_ipaddr_copy(picmp->destipaddr, destaddr);
#else /* CONFIG_NET_IPv6 */
picmp->vhl = 0x45;
picmp->tos = 0;
picmp->len[0] = (dev->d_len >> 8);
picmp->len[1] = (dev->d_len & 0xff);
++g_ipid;
picmp->ipid[0] = g_ipid >> 8;
picmp->ipid[1] = g_ipid & 0xff;
picmp->ipoffset[0] = UIP_TCPFLAG_DONTFRAG >> 8;
picmp->ipoffset[1] = UIP_TCPFLAG_DONTFRAG & 0xff;
picmp->ttl = UIP_TTL;
picmp->proto = UIP_PROTO_ICMP;
uiphdr_ipaddr_copy(picmp->srcipaddr, &dev->d_ipaddr);
uiphdr_ipaddr_copy(picmp->destipaddr, destaddr);
/* Calculate IP checksum. */
picmp->ipchksum = 0;
picmp->ipchksum = ~(ip_chksum(dev));
#endif /* CONFIG_NET_IPv6 */
/* Calculate the ICMP checksum. */
picmp->icmpchksum = 0;
picmp->icmpchksum = ~(icmp_chksum(dev, dev->d_sndlen));
if (picmp->icmpchksum == 0)
{
picmp->icmpchksum = 0xffff;
}
nllvdbg("Outgoing ICMP packet length: %d (%d)\n",
dev->d_len, (picmp->len[0] << 8) | picmp->len[1]);
#ifdef CONFIG_NET_STATISTICS
g_netstats.icmp.sent++;
g_netstats.ip.sent++;
#endif
}
}
#endif /* CONFIG_NET && CONFIG_NET_ICMP && CONFIG_NET_ICMP_PING */