00001 /* 00002 * Copyright (C) 2001-2003 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 1.6 2008/08/11 06:59:42 haraldkipp 00097 * BSD types replaced by stdint types (feature request #1282721). 00098 * 00099 * Revision 1.5 2008/08/09 17:35:32 haraldkipp 00100 * Simplified NETBUF allocation and release. 00101 * 00102 * Revision 1.4 2008/04/18 13:31:59 haraldkipp 00103 * Changed size parameter from uint16_t to int, which is easier to handle 00104 * for 32-bit targets. You need to recompile your ARM code. No impact on 00105 * AVR expected 00106 * I changed u_int to int at some places to avoid some warnings during 00107 * compilation of Nut/Net. 00108 * libs. 00109 * 00110 * Revision 1.3 2005/04/30 16:42:41 chaac 00111 * Fixed bug in handling of NUTDEBUG. Added include for cfg/os.h. If NUTDEBUG 00112 * is defined in NutConf, it will make effect where it is used. 00113 * 00114 * Revision 1.2 2004/01/16 07:51:43 drsung 00115 * Bugfix for reallocating smaller network buffers. Thx to Mike Cornelius. 00116 * 00117 * Revision 1.1.1.1 2003/05/09 14:40:46 haraldkipp 00118 * Initial using 3.2.1 00119 * 00120 * Revision 1.12 2003/03/31 14:53:07 harald 00121 * Prepare release 3.1 00122 * 00123 * Revision 1.11 2003/02/04 17:50:54 harald 00124 * Version 3 released 00125 * 00126 * Revision 1.10 2002/06/26 17:29:08 harald 00127 * First pre-release with 2.4 stack 00128 * 00129 */ 00130 00131 #include <cfg/os.h> 00132 #include <string.h> 00133 00134 #include <sys/heap.h> 00135 #include <dev/netbuf.h> 00136 00137 #include <sys/nutdebug.h> 00138 00143 00144 static int NutNetBufAllocData(NBDATA * nbd, int size) 00145 { 00146 nbd->vp = NutHeapAlloc(size); 00147 if (nbd->vp) { 00148 nbd->sz = size; 00149 return 0; 00150 } 00151 return -1; 00152 } 00153 00173 NETBUF *NutNetBufAlloc(NETBUF * nb, uint8_t type, int size) 00174 { 00175 NBDATA * nbd; 00176 00177 NUTASSERT(size > 0); 00178 NUTASSERT(type == NBAF_DATALINK || 00179 type == NBAF_NETWORK || 00180 type == NBAF_TRANSPORT || 00181 type == NBAF_APPLICATION); 00182 00183 /* Allocate a new buffer, if the caller don't provide one. */ 00184 if (nb == NULL) { 00185 nb = NutHeapAllocClear(sizeof(NETBUF)); 00186 } 00187 /* Make sure, that the allocation above was successful. */ 00188 if (nb) { 00189 /* Determine the data type. */ 00190 switch(type) { 00191 case NBAF_DATALINK: 00192 nbd = &nb->nb_dl; 00193 break; 00194 case NBAF_NETWORK: 00195 nbd = &nb->nb_nw; 00196 break; 00197 case NBAF_TRANSPORT: 00198 nbd = &nb->nb_tp; 00199 break; 00200 default: 00201 nbd = &nb->nb_ap; 00202 break; 00203 } 00204 /* Check previously allocated buffer. */ 00205 if (nb->nb_flags & type) { 00206 if (nbd->sz < size) { 00207 /* Existing buffer is too small. */ 00208 NutHeapFree(nbd->vp); 00209 nbd->sz = 0; 00210 } else { 00211 /* 00212 * Reduce the size. This is actually a bad idea, because 00213 * we may waste too much memory. One option would be to 00214 * use the new NutHeapRealloc, but not sure if it will 00215 * work for 32-bit CPUs after some crashes after its 00216 * introduction. Further, I'm not fully sure, if our 00217 * network routines actually re-use network buffers. 00218 */ 00219 nbd->sz = size; 00220 } 00221 } else { 00222 /* Buffer was not allocated from heap. */ 00223 nbd->sz = 0; 00224 } 00225 /* If the size is zero at this point, 00226 we need to allocate a new buffer. */ 00227 if (nbd->sz == 0) { 00228 if (NutNetBufAllocData(nbd, size)) { 00229 /* Out of memory, release the complete net buffer. */ 00230 NutNetBufFree(nb); 00231 nb = NULL; 00232 } else { 00233 /* Success, mark the buffer allocated. */ 00234 nb->nb_flags |= type; 00235 } 00236 } 00237 } 00238 return nb; 00239 } 00240 00251 NETBUF *NutNetBufClone(NETBUF * nb) 00252 { 00253 NETBUF *cb = NutHeapAllocClear(sizeof(NETBUF)); 00254 00255 NUTASSERT(nb != NULL); 00256 00257 if (cb) { 00258 register int e = 0; 00259 register int s; 00260 00261 s = nb->nb_dl.sz; 00262 if (s && (e = NutNetBufAllocData(&cb->nb_dl, s)) == 0) { 00263 memcpy(cb->nb_dl.vp, nb->nb_dl.vp, s); 00264 cb->nb_flags |= NBAF_DATALINK; 00265 } 00266 s = nb->nb_nw.sz; 00267 if (s && e == 0 && (e = NutNetBufAllocData(&cb->nb_nw, s)) == 0) { 00268 memcpy(cb->nb_nw.vp, nb->nb_nw.vp, s); 00269 cb->nb_flags |= NBAF_NETWORK; 00270 } 00271 s = nb->nb_tp.sz; 00272 if (s && e == 0 && (e = NutNetBufAllocData(&cb->nb_tp, s)) == 0) { 00273 memcpy(cb->nb_tp.vp, nb->nb_tp.vp, s); 00274 cb->nb_flags |= NBAF_TRANSPORT; 00275 } 00276 s = nb->nb_ap.sz; 00277 if (s && e == 0 && (e = NutNetBufAllocData(&cb->nb_ap, s)) == 0) { 00278 memcpy(cb->nb_ap.vp, nb->nb_ap.vp, s); 00279 cb->nb_flags |= NBAF_APPLICATION; 00280 } 00281 if (e) { 00282 NutNetBufFree(cb); 00283 cb = NULL; 00284 } 00285 } 00286 return cb; 00287 } 00288 00299 void NutNetBufFree(NETBUF * nb) 00300 { 00301 NUTASSERT(nb); 00302 00303 if (nb->nb_flags & NBAF_DATALINK) { 00304 NutHeapFree(nb->nb_dl.vp); 00305 } 00306 if (nb->nb_flags & NBAF_NETWORK) { 00307 NutHeapFree(nb->nb_nw.vp); 00308 } 00309 if (nb->nb_flags & NBAF_TRANSPORT) { 00310 NutHeapFree(nb->nb_tp.vp); 00311 } 00312 if (nb->nb_flags & NBAF_APPLICATION) { 00313 NutHeapFree(nb->nb_ap.vp); 00314 } 00315 NutHeapFree(nb); 00316 } 00317