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: ipin.c,v $ 00096 * Revision 1.12 2008/04/18 13:13:11 haraldkipp 00097 * Using fast ints. 00098 * 00099 * Revision 1.11 2007/07/09 16:20:19 olereinhardt 00100 * 2007-07-09 Ole Reinhardt <ole.reinhardt@embedded-it.de> 00101 * * net/Makefile: Commented in igmp_in.c and igmp_out.c again 00102 * * net/ipin.c: igmp support reenabled 00103 * 00104 * Revision 1.10 2007/07/09 15:59:00 olereinhardt 00105 * 2007-07-09 Ole Reinhardt <ole.reinhardt@embedded-it.de> 00106 * * ipin.c: commented out igmp support as long as it does not compile 00107 * 00108 * Revision 1.9 2007/05/02 11:18:32 haraldkipp 00109 * IGMP support added. Incomplete. 00110 * 00111 * Revision 1.8 2007/03/23 12:43:50 haraldkipp 00112 * ARP method wasn't actually disabled by default. Fixed. 00113 * 00114 * Revision 1.7 2006/09/05 12:35:39 haraldkipp 00115 * DHCP servers may probe an IP/MAC relationship by sending an 00116 * ICMP request. This triggered the Nut/Net ARP method and 00117 * terminated the DHCP client, leaving the system with default 00118 * configurations of the network mask (255.255.255.0) and 00119 * default gateway (none). The rarely used ARP method is now 00120 * disabled by default. 00121 * 00122 * Revision 1.6 2006/07/10 17:46:59 haraldkipp 00123 * Now really like Jan suggested to fix it. 00124 * 00125 * Revision 1.5 2006/07/10 08:49:47 haraldkipp 00126 * Do not respond to broadcasts with unknown protocols. Many thanks to Jan. 00127 * 00128 * Revision 1.4 2005/06/05 16:48:26 haraldkipp 00129 * Additional parameter enables NutUdpInput() to avoid responding to UDP 00130 * broadcasts with ICMP unreachable messages. Fixes bug #1215192. 00131 * 00132 * Revision 1.3 2004/12/16 18:48:50 haraldkipp 00133 * Added Damian Slee's IP filter function. 00134 * 00135 * Revision 1.2 2004/02/02 18:59:25 drsung 00136 * Some more ICMP support added. 00137 * 00138 * Revision 1.1.1.1 2003/05/09 14:41:32 haraldkipp 00139 * Initial using 3.2.1 00140 * 00141 * Revision 1.16 2003/05/06 18:14:18 harald 00142 * Allow incoming DHCP telegrams, even if not broadcasted 00143 * 00144 * Revision 1.15 2003/03/31 12:26:05 harald 00145 * Accept masks with all bits set 00146 * 00147 * Revision 1.14 2003/02/04 18:14:57 harald 00148 * Version 3 released 00149 * 00150 * Revision 1.13 2002/06/26 17:29:36 harald 00151 * First pre-release with 2.4 stack 00152 * 00153 */ 00154 00155 #include <cfg/ip.h> 00156 00157 #include <net/route.h> 00158 #include <netinet/in.h> 00159 #include <netinet/ip.h> 00160 #include <netinet/icmp.h> 00161 #include <netinet/ip_icmp.h> 00162 #include <netinet/igmp.h> 00163 #include <netinet/udp.h> 00164 #include <sys/socket.h> 00165 #include <arpa/inet.h> 00166 00171 00172 static NutIpFilterFunc NutIpFilter; 00173 00187 void NutIpSetInputFilter(NutIpFilterFunc callbackFunc) 00188 { 00189 NutIpFilter = callbackFunc; 00190 } 00191 00205 void NutIpInput(NUTDEVICE * dev, NETBUF * nb) 00206 { 00207 IPHDR *ip; 00208 u_short ip_hdrlen; 00209 u_long dst; 00210 uint_fast8_t bcast; 00211 IFNET *nif; 00212 00213 ip = nb->nb_nw.vp; 00214 00215 /* 00216 * Silently discard datagrams of different IP version as well as 00217 * fragmented or filtered datagrams. 00218 */ 00219 if (ip->ip_v != IPVERSION || /* Version check. */ 00220 (ntohs(ip->ip_off) & (IP_MF | IP_OFFMASK)) != 0 || /* Fragmentation. */ 00221 (NutIpFilter && NutIpFilter(ip->ip_src))) { /* Filter. */ 00222 NutNetBufFree(nb); 00223 return; 00224 } 00225 00226 /* 00227 * IP header length is given in 32-bit fields. Calculate the size in 00228 * bytes and make sure that the header we know will fit in. 00229 */ 00230 ip_hdrlen = ip->ip_hl * 4; 00231 if (ip_hdrlen < sizeof(IPHDR)) { 00232 NutNetBufFree(nb); 00233 return; 00234 } 00235 00236 /* 00237 * No checksum calculation on incoming datagrams! 00238 */ 00239 00240 /* 00241 * Check for broadcast. 00242 */ 00243 dst = ip->ip_dst; 00244 nif = dev->dev_icb; 00245 00246 if (dst == INADDR_BROADCAST || 00247 (nif->if_local_ip && nif->if_mask != INADDR_BROADCAST && (dst | nif->if_mask) == INADDR_BROADCAST)) { 00248 bcast = 1; 00249 } 00250 00251 /* 00252 * Check for multicast. 00253 */ 00254 else if (IN_MULTICAST(dst)) { 00255 MCASTENTRY *mca; 00256 00257 for (mca = nif->if_mcast; mca; mca = mca->mca_next) { 00258 if (dst == mca->mca_ip) { 00259 break; 00260 } 00261 } 00262 if (mca == NULL) { 00263 NutNetBufFree(nb); 00264 return; 00265 } 00266 bcast = 2; 00267 } 00268 00269 /* 00270 * Packet is unicast. 00271 */ 00272 else { 00273 bcast = 0; 00274 00275 #ifdef NUTIPCONF_ICMP_ARPMETHOD 00276 /* 00277 * Silently discard datagrams for other destinations. 00278 * However, if we haven't got an IP address yet, we 00279 * allow ICMP datagrams to support dynamic IP ARP method, 00280 * if this option had been enabled. 00281 */ 00282 if (nif->if_local_ip == 0 && ip->ip_p == IPPROTO_ICMP && (dst & 0xff000000) != 0xff000000 && (dst & 0xff000000) != 0) { 00283 NutNetIfSetup(dev, dst, 0, 0); 00284 } 00285 #endif 00286 if (nif->if_local_ip && (dst == 0 || dst != nif->if_local_ip)) { 00287 NutNetBufFree(nb); 00288 return; 00289 } 00290 } 00291 00292 nb->nb_nw.sz = ip_hdrlen; 00293 nb->nb_tp.vp = ((u_char *) ip) + (ip_hdrlen); 00294 nb->nb_tp.sz = htons(ip->ip_len) - (ip_hdrlen); 00295 00296 switch (ip->ip_p) { 00297 case IPPROTO_ICMP: 00298 NutIcmpInput(dev, nb); 00299 break; 00300 case IPPROTO_UDP: 00301 NutUdpInput(nb, bcast); 00302 break; 00303 case IPPROTO_TCP: 00304 /* 00305 * Silently discard TCP broadcasts. 00306 */ 00307 if (bcast) 00308 NutNetBufFree(nb); 00309 else 00310 NutTcpInput(nb); 00311 break; 00312 case IPPROTO_IGMP: 00313 NutIgmpInput(dev, nb); 00314 break; 00315 default: 00316 /* Unkown protocol, send ICMP destination (protocol) 00317 * unreachable message. 00318 */ 00319 if (bcast || !NutIcmpResponse(ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, nb)) 00320 NutNetBufFree(nb); 00321 break; 00322 } 00323 } 00324