00001 /* 00002 * Copyright (C) 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 00034 * Copyright (c) 1988 Stephen Deering. 00035 * Copyright (c) 1992, 1993 00036 * The Regents of the University of California. All rights reserved. 00037 * 00038 * This code is derived from software contributed to Berkeley by 00039 * Stephen Deering of Stanford University. 00040 * 00041 * Redistribution and use in source and binary forms, with or without 00042 * modification, are permitted provided that the following conditions 00043 * are met: 00044 * 1. Redistributions of source code must retain the above copyright 00045 * notice, this list of conditions and the following disclaimer. 00046 * 2. Redistributions in binary form must reproduce the above copyright 00047 * notice, this list of conditions and the following disclaimer in the 00048 * documentation and/or other materials provided with the distribution. 00049 * 3. Neither the name of the University nor the names of its contributors 00050 * may be used to endorse or promote products derived from this software 00051 * without specific prior written permission. 00052 * 00053 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00054 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00055 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00056 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00057 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00058 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00059 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00060 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00061 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00062 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00063 * SUCH DAMAGE. 00064 */ 00065 00066 /* 00067 * $Log: igmpin.c,v $ 00068 * Revision 1.2 2008/10/05 16:48:52 haraldkipp 00069 * Security fix. Check various lengths of incoming packets. 00070 * 00071 * Revision 1.1 2007/05/02 11:18:31 haraldkipp 00072 * IGMP support added. Incomplete. 00073 * 00074 */ 00075 00076 #include <net/if_var.h> 00077 #include <netinet/ipcsum.h> 00078 #include <netinet/igmp.h> 00079 #include <sys/socket.h> 00080 #include <netinet/tcp.h> 00081 #include <net/errno.h> 00082 #include <netinet/in.h> 00083 00088 00095 void NutIgmpInput(NUTDEVICE * dev, NETBUF * nb) 00096 { 00097 IGMP *igmp = (IGMP *) nb->nb_tp.vp; 00098 00099 /* 00100 * Silently discard packets, which are too small. 00101 */ 00102 if (igmp == NULL || nb->nb_tp.sz < IGMP_MINLEN) { 00103 NutNetBufFree(nb); 00104 return; 00105 } 00106 00107 switch (igmp->igmp_type) { 00108 case IGMP_MEMBERSHIP_QUERY: 00109 break; 00110 case IGMP_V1_MEMBERSHIP_REPORT: 00111 case IGMP_V2_MEMBERSHIP_REPORT: 00112 break; 00113 default: 00114 /* Unrecognized message types are silently ignored. */ 00115 NutNetBufFree(nb); 00116 } 00117 } 00118