ipout.c

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00001 /*
00002  * Copyright (C) 2001-2007 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 1.7  2008/08/11 07:00:30  haraldkipp
00097  * BSD types replaced by stdint types (feature request #1282721).
00098  *
00099  * Revision 1.6  2007/05/02 11:18:32  haraldkipp
00100  * IGMP support added. Incomplete.
00101  *
00102  * Revision 1.5  2006/10/17 11:05:03  haraldkipp
00103  * Failed ARP requests are no longer classified as fatal transmission errors.
00104  *
00105  * Revision 1.4  2005/04/08 15:20:50  olereinhardt
00106  * added <sys/types.h> (__APPLE__) and <netinet/in.h> (__linux__)
00107  * for htons and simmilar.
00108  *
00109  * Revision 1.3  2004/10/10 16:37:03  drsung
00110  * Detection of directed broadcasts to local network added.
00111  *
00112  * Revision 1.2  2003/07/20 16:00:23  haraldkipp
00113  * Memory hole fixed.
00114  *
00115  * Revision 1.1.1.1  2003/05/09 14:41:33  haraldkipp
00116  * Initial using 3.2.1
00117  *
00118  * Revision 1.17  2003/04/01 18:31:47  harald
00119  * *** empty log message ***
00120  *
00121  * Revision 1.16  2003/03/31 12:28:10  harald
00122  * Check NEBUF allocation
00123  *
00124  * Revision 1.15  2003/02/04 18:14:57  harald
00125  * Version 3 released
00126  *
00127  * Revision 1.14  2003/01/14 16:44:08  harald
00128  * *** empty log message ***
00129  *
00130  * Revision 1.13  2002/10/29 15:32:14  harald
00131  * PPP support
00132  *
00133  * Revision 1.12  2002/09/15 16:49:42  harald
00134  * *** empty log message ***
00135  *
00136  * Revision 1.11  2002/06/26 17:29:36  harald
00137  * First pre-release with 2.4 stack
00138  *
00139  */
00140 
00141 #include <string.h>
00142 
00143 #include <sys/types.h>
00144 #include <net/ether.h>
00145 #include <net/route.h>
00146 #include <netinet/if_ether.h>
00147 #include <netinet/if_ppp.h>
00148 #include <netinet/ipcsum.h>
00149 #include <netinet/ip.h>
00150 #include <netinet/in.h>
00155 
00182 int NutIpOutput(uint8_t proto, uint32_t dest, NETBUF * nb)
00183 {
00184     uint8_t ha[6];
00185     IPHDR *ip;
00186     NUTDEVICE *dev;
00187     IFNET *nif;
00188     uint32_t gate;
00189 
00190     if ((nb = NutNetBufAlloc(nb, NBAF_NETWORK, sizeof(IPHDR))) == 0)
00191         return -1;
00192 
00193     /*
00194      * Set those items in the IP header, which are common for
00195      * all interfaces.
00196      */
00197     ip = nb->nb_nw.vp;
00198     ip->ip_v = 4;
00199     ip->ip_hl = sizeof(IPHDR) / 4;
00200     ip->ip_tos = 0;
00201     ip->ip_len = htons(nb->nb_nw.sz + nb->nb_tp.sz + nb->nb_ap.sz);
00202     ip->ip_off = 0;
00203     if (proto == IPPROTO_IGMP) {
00204         ip->ip_ttl = 1;
00205     } else {
00206         ip->ip_ttl = 0x40;
00207     }
00208     ip->ip_p = proto;
00209     ip->ip_dst = dest;
00210 
00211     /*
00212      * Limited broadcasts are sent on all network interfaces.
00213      * See RFC 919.
00214      */
00215     if (dest == 0xffffffff) {
00216 
00217         memset(ha, 0xff, sizeof(ha));
00218         for (dev = nutDeviceList; dev; dev = dev->dev_next) {
00219             if (dev->dev_type == IFTYP_NET) {
00220                 /*
00221                  * Set remaining IP header items using a NETBUF clone and calculate 
00222                  * the checksum.
00223                  */
00224                 int rc = 0;
00225                 NETBUF *nb_clone = NutNetBufClonePart(nb, NBAF_NETWORK);
00226 
00227                 nif = dev->dev_icb;
00228                 ip = nb_clone->nb_nw.vp;
00229                 ip->ip_id = htons(nif->if_pkt_id);
00230                 nif->if_pkt_id++;
00231                 ip->ip_src = nif->if_local_ip;
00232                 ip->ip_ttl = 1;
00233                 ip->ip_sum = 0;
00234                 ip->ip_sum = NutIpChkSum(0, nb_clone->nb_nw.vp, nb_clone->nb_nw.sz);
00235                 if (nif->if_type == IFT_ETHER)
00236                     rc = (*nif->if_output) (dev, ETHERTYPE_IP, ha, nb_clone);
00237                 else if (nif->if_type == IFT_PPP)
00238                     rc = (*nif->if_output) (dev, PPP_IP, 0, nb_clone);
00239                 if (rc == 0) {
00240                     NutNetBufFree(nb_clone);
00241                 }
00242             }
00243         }
00244         return 0;
00245     }
00246 
00247     /*
00248      * Get destination's route. This will also return the proper 
00249      * interface.
00250      */
00251     if ((dev = NutIpRouteQuery(dest, &gate)) == 0) {
00252         NutNetBufFree(nb);
00253         return -1;
00254     }
00255 
00256     /*
00257      * Set remaining IP header items and calculate the checksum.
00258      */
00259     nif = dev->dev_icb;
00260     ip->ip_id = htons(nif->if_pkt_id);
00261     nif->if_pkt_id++;
00262     ip->ip_src = nif->if_local_ip;
00263     ip->ip_sum = 0;
00264     ip->ip_sum = NutIpChkSum(0, nb->nb_nw.vp, nb->nb_nw.sz);
00265 
00266     /*
00267      * On Ethernet we query the MAC address of our next hop,
00268      * which might be the destination or the gateway to this
00269      * destination.
00270      */
00271     if (nif->if_type == IFT_ETHER) {
00272         /* 
00273          * Detect directed broadcasts for the local network. In this
00274          * case don't send ARP queries, but send directly to MAC broadcast
00275          * address. 
00276          */
00277         if ((gate == 0) && ((dest | nif->if_mask) == 0xffffffff)) {
00278             memset(ha, 0xff, sizeof(ha));
00279         } else if (NutArpCacheQuery(dev, gate ? gate : dest, ha)) {
00280             /* Note, that a failed ARP request is not considered a 
00281                transmission error. It might be caused by a simple 
00282                packet loss. */
00283             return 0;
00284         }
00285         return (*nif->if_output) (dev, ETHERTYPE_IP, ha, nb);
00286     } else if (nif->if_type == IFT_PPP)
00287         return (*nif->if_output) (dev, PPP_IP, 0, nb);
00288 
00289     NutNetBufFree(nb);
00290     return -1;
00291 }
00292 

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