Nut/OS  4.10.3
API Reference
icmpout.c
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00001 /*
00002  * Copyright (C) 2001-2004 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  * -
00033  * Portions Copyright (C) 2000 David J. Hudson <dave@humbug.demon.co.uk>
00034  *
00035  * This file is distributed in the hope that it will be useful, but WITHOUT
00036  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00037  * FITNESS FOR A PARTICULAR PURPOSE.
00038  *
00039  * You can redistribute this file and/or modify it under the terms of the GNU
00040  * General Public License (GPL) as published by the Free Software Foundation;
00041  * either version 2 of the License, or (at your discretion) any later version.
00042  * See the accompanying file "copying-gpl.txt" for more details.
00043  *
00044  * As a special exception to the GPL, permission is granted for additional
00045  * uses of the text contained in this file.  See the accompanying file
00046  * "copying-liquorice.txt" for details.
00047  * -
00048  * Portions Copyright (c) 1983, 1993 by
00049  *  The Regents of the University of California.  All rights reserved.
00050  *
00051  * Redistribution and use in source and binary forms, with or without
00052  * modification, are permitted provided that the following conditions
00053  * are met:
00054  * 1. Redistributions of source code must retain the above copyright
00055  *    notice, this list of conditions and the following disclaimer.
00056  * 2. Redistributions in binary form must reproduce the above copyright
00057  *    notice, this list of conditions and the following disclaimer in the
00058  *    documentation and/or other materials provided with the distribution.
00059  * 3. Neither the name of the University nor the names of its contributors
00060  *    may be used to endorse or promote products derived from this software
00061  *    without specific prior written permission.
00062  *
00063  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00064  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00065  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00066  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00067  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00068  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00069  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00070  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00071  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00072  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00073  * SUCH DAMAGE.
00074  * -
00075  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
00076  *
00077  * Permission to use, copy, modify, and distribute this software for any
00078  * purpose with or without fee is hereby granted, provided that the above
00079  * copyright notice and this permission notice appear in all copies, and that
00080  * the name of Digital Equipment Corporation not be used in advertising or
00081  * publicity pertaining to distribution of the document or software without
00082  * specific, written prior permission.
00083  * 
00084  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
00085  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
00086  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
00087  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
00088  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
00089  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
00090  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
00091  * SOFTWARE.
00092  */
00093 
00094 /*
00095  * $Log$
00096  * Revision 1.5  2008/08/11 07:00:29  haraldkipp
00097  * BSD types replaced by stdint types (feature request #1282721).
00098  *
00099  * Revision 1.4  2004/03/08 11:22:16  haraldkipp
00100  * Not all compilers like pointer calculation with void pointers
00101  *
00102  * Revision 1.3  2004/02/06 19:24:00  drsung
00103  * Bugfix. After last changes, ping didn't work any more. Thanks to Pavel Celeda, who discovered this bug.
00104  *
00105  * Revision 1.2  2004/02/02 18:59:25  drsung
00106  * Some more ICMP support added.
00107  *
00108  * Revision 1.1.1.1  2003/05/09 14:41:28  haraldkipp
00109  * Initial using 3.2.1
00110  *
00111  * Revision 1.11  2003/03/31 12:02:27  harald
00112  * Check NEBUF allocation
00113  *
00114  * Revision 1.10  2003/02/04 18:14:57  harald
00115  * Version 3 released
00116  *
00117  * Revision 1.9  2002/06/26 17:29:35  harald
00118  * First pre-release with 2.4 stack
00119  *
00120  */
00121 
00122 #include <netinet/in.h>
00123 #include <netinet/ip_icmp.h>
00124 #include <netinet/ipcsum.h>
00125 #include <netinet/icmp.h>
00126 #include <string.h>
00127 
00159 int NutIcmpOutput(uint8_t type, uint32_t dest, NETBUF * nb)
00160 {
00161     ICMPHDR *icp;
00162     uint16_t csum;
00163 
00164     icp = (ICMPHDR *) nb->nb_tp.vp;
00165     icp->icmp_type = type;
00166     icp->icmp_cksum = 0;
00167 
00168     csum = NutIpChkSumPartial(0, nb->nb_tp.vp, nb->nb_tp.sz);
00169     icp->icmp_cksum = NutIpChkSum(csum, nb->nb_ap.vp, nb->nb_ap.sz);
00170 
00171     return NutIpOutput(IPPROTO_ICMP, dest, nb);
00172 }
00173 
00189 int NutIcmpReply(uint8_t type, uint8_t code, uint32_t spec, uint32_t dest, NETBUF * nb)
00190 {
00191     ICMPHDR *icp;
00192 
00193     if ((nb = NutNetBufAlloc(nb, NBAF_TRANSPORT, sizeof(ICMPHDR))) == 0)
00194         return -1;
00195 
00196     icp = (ICMPHDR *) nb->nb_tp.vp;
00197     icp->icmp_code = code;
00198     icp->icmp_spec = spec;
00199 
00200     return NutIcmpOutput(type, dest, nb);
00201 }
00202 
00219 int NutIcmpResponse(uint8_t type, uint8_t code, uint32_t spec, NETBUF * nb)
00220 {
00221     IPHDR *ip;
00222     uint32_t dest;
00223 
00224     ip = nb->nb_nw.vp;
00225     dest = ip->ip_src;
00226 
00227     if ((nb = NutNetBufAlloc(nb, NBAF_APPLICATION, sizeof(IPHDR) + 8)) == 0)
00228         return -1;
00229 
00230     memcpy(nb->nb_ap.vp, nb->nb_nw.vp, sizeof(IPHDR));
00231     memcpy((char *)nb->nb_ap.vp + sizeof(IPHDR), nb->nb_tp.vp, 8);
00232 
00233     return NutIcmpReply(type, code, spec, dest, nb);
00234 }
00235 
00236