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: ipout.c,v $ 00096 * Revision 1.6 2007/05/02 11:18:32 haraldkipp 00097 * IGMP support added. Incomplete. 00098 * 00099 * Revision 1.5 2006/10/17 11:05:03 haraldkipp 00100 * Failed ARP requests are no longer classified as fatal transmission errors. 00101 * 00102 * Revision 1.4 2005/04/08 15:20:50 olereinhardt 00103 * added <sys/types.h> (__APPLE__) and <netinet/in.h> (__linux__) 00104 * for htons and simmilar. 00105 * 00106 * Revision 1.3 2004/10/10 16:37:03 drsung 00107 * Detection of directed broadcasts to local network added. 00108 * 00109 * Revision 1.2 2003/07/20 16:00:23 haraldkipp 00110 * Memory hole fixed. 00111 * 00112 * Revision 1.1.1.1 2003/05/09 14:41:33 haraldkipp 00113 * Initial using 3.2.1 00114 * 00115 * Revision 1.17 2003/04/01 18:31:47 harald 00116 * *** empty log message *** 00117 * 00118 * Revision 1.16 2003/03/31 12:28:10 harald 00119 * Check NEBUF allocation 00120 * 00121 * Revision 1.15 2003/02/04 18:14:57 harald 00122 * Version 3 released 00123 * 00124 * Revision 1.14 2003/01/14 16:44:08 harald 00125 * *** empty log message *** 00126 * 00127 * Revision 1.13 2002/10/29 15:32:14 harald 00128 * PPP support 00129 * 00130 * Revision 1.12 2002/09/15 16:49:42 harald 00131 * *** empty log message *** 00132 * 00133 * Revision 1.11 2002/06/26 17:29:36 harald 00134 * First pre-release with 2.4 stack 00135 * 00136 */ 00137 00138 #include <string.h> 00139 00140 #include <sys/types.h> 00141 #include <net/ether.h> 00142 #include <net/route.h> 00143 #include <netinet/if_ether.h> 00144 #include <netinet/if_ppp.h> 00145 #include <netinet/ipcsum.h> 00146 #include <netinet/ip.h> 00147 #include <netinet/in.h> 00152 00179 int NutIpOutput(u_char proto, u_long dest, NETBUF * nb) 00180 { 00181 u_char ha[6]; 00182 IPHDR *ip; 00183 NUTDEVICE *dev; 00184 IFNET *nif; 00185 u_long gate; 00186 int rc; 00187 00188 if ((nb = NutNetBufAlloc(nb, NBAF_NETWORK, sizeof(IPHDR))) == 0) 00189 return -1; 00190 00191 /* 00192 * Set those items in the IP header, which are common for 00193 * all interfaces. 00194 */ 00195 ip = nb->nb_nw.vp; 00196 ip->ip_v = 4; 00197 ip->ip_hl = sizeof(IPHDR) / 4; 00198 ip->ip_tos = 0; 00199 ip->ip_len = htons(nb->nb_nw.sz + nb->nb_tp.sz + nb->nb_ap.sz); 00200 ip->ip_off = 0; 00201 if (proto == IPPROTO_IGMP) { 00202 ip->ip_ttl = 1; 00203 } else { 00204 ip->ip_ttl = 0x40; 00205 } 00206 ip->ip_p = proto; 00207 ip->ip_dst = dest; 00208 00209 /* 00210 * Broadcasts are sent on all network interfaces. 00211 */ 00212 if (dest == 0xffffffff) { 00213 00214 memset(ha, 0xff, sizeof(ha)); 00215 00216 for (dev = nutDeviceList, rc = 0; dev && rc == 0; dev = dev->dev_next) { 00217 if (dev->dev_type == IFTYP_NET) { 00218 00219 /* 00220 * Set remaining IP header items and calculate the checksum. 00221 */ 00222 nif = dev->dev_icb; 00223 ip->ip_id = htons(nif->if_pkt_id++); 00224 ip->ip_src = nif->if_local_ip; 00225 ip->ip_sum = 0; 00226 ip->ip_sum = NutIpChkSum(0, nb->nb_nw.vp, nb->nb_nw.sz); 00227 /* 00228 * TODO: We must clone the NETBUF!!! 00229 */ 00230 if (nif->if_type == IFT_ETHER) 00231 rc = (*nif->if_output) (dev, ETHERTYPE_IP, ha, nb); 00232 else 00233 rc = (*nif->if_output) (dev, PPP_IP, 0, nb); 00234 } 00235 } 00236 return rc; 00237 } 00238 00239 /* 00240 * Get destination's route. This will also return the proper 00241 * interface. 00242 */ 00243 if ((dev = NutIpRouteQuery(dest, &gate)) == 0) { 00244 NutNetBufFree(nb); 00245 return -1; 00246 } 00247 00248 /* 00249 * Set remaining IP header items and calculate the checksum. 00250 */ 00251 nif = dev->dev_icb; 00252 ip->ip_id = htons(nif->if_pkt_id++); 00253 ip->ip_src = nif->if_local_ip; 00254 ip->ip_sum = 0; 00255 ip->ip_sum = NutIpChkSum(0, nb->nb_nw.vp, nb->nb_nw.sz); 00256 00257 /* 00258 * On Ethernet we query the MAC address of our next hop, 00259 * which might be the destination or the gateway to this 00260 * destination. 00261 */ 00262 if (nif->if_type == IFT_ETHER) { 00263 /* 00264 * Detect directed broadcasts for the local network. In this 00265 * case don't send ARP queries, but send directly to MAC broadcast 00266 * address. 00267 */ 00268 if ((gate == 0) && ((dest | nif->if_mask) == 0xffffffff)) { 00269 memset(ha, 0xff, sizeof(ha)); 00270 } else if (NutArpCacheQuery(dev, gate ? gate : dest, ha)) { 00271 /* Note, that a failed ARP request is not considered a 00272 transmission error. It might be caused by a simple 00273 packet loss. */ 00274 return 0; 00275 } 00276 return (*nif->if_output) (dev, ETHERTYPE_IP, ha, nb); 00277 } else if (nif->if_type == IFT_PPP) 00278 return (*nif->if_output) (dev, PPP_IP, 0, nb); 00279 00280 NutNetBufFree(nb); 00281 return -1; 00282 } 00283