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Dependencies:   BufferedSerial FatFileSystemCpp mbed

EthernetInterface/lwip/api/netbuf.c@74:a1bf25282cb1, 2022-02-10 (annotated)

Committer:
JamieB
Date:
Thu Feb 10 10:43:50 2022 +0000
Revision:
74:a1bf25282cb1
Parent:
22:0dd9c1b5664a 
Incremented version to 0.27 (forgot to on the last commit...)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AndyA 22:0dd9c1b5664a 1 /**
AndyA 22:0dd9c1b5664a 2 * @file
AndyA 22:0dd9c1b5664a 3 * Network buffer management
AndyA 22:0dd9c1b5664a 4 *
AndyA 22:0dd9c1b5664a 5 */
AndyA 22:0dd9c1b5664a 6
AndyA 22:0dd9c1b5664a 7 /*
AndyA 22:0dd9c1b5664a 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AndyA 22:0dd9c1b5664a 9 * All rights reserved.
AndyA 22:0dd9c1b5664a 10 *
AndyA 22:0dd9c1b5664a 11 * Redistribution and use in source and binary forms, with or without modification,
AndyA 22:0dd9c1b5664a 12 * are permitted provided that the following conditions are met:
AndyA 22:0dd9c1b5664a 13 *
AndyA 22:0dd9c1b5664a 14 * 1. Redistributions of source code must retain the above copyright notice,
AndyA 22:0dd9c1b5664a 15 * this list of conditions and the following disclaimer.
AndyA 22:0dd9c1b5664a 16 * 2. Redistributions in binary form must reproduce the above copyright notice,
AndyA 22:0dd9c1b5664a 17 * this list of conditions and the following disclaimer in the documentation
AndyA 22:0dd9c1b5664a 18 * and/or other materials provided with the distribution.
AndyA 22:0dd9c1b5664a 19 * 3. The name of the author may not be used to endorse or promote products
AndyA 22:0dd9c1b5664a 20 * derived from this software without specific prior written permission.
AndyA 22:0dd9c1b5664a 21 *
AndyA 22:0dd9c1b5664a 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
AndyA 22:0dd9c1b5664a 23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
AndyA 22:0dd9c1b5664a 24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
AndyA 22:0dd9c1b5664a 25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
AndyA 22:0dd9c1b5664a 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
AndyA 22:0dd9c1b5664a 27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
AndyA 22:0dd9c1b5664a 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
AndyA 22:0dd9c1b5664a 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
AndyA 22:0dd9c1b5664a 30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
AndyA 22:0dd9c1b5664a 31 * OF SUCH DAMAGE.
AndyA 22:0dd9c1b5664a 32 *
AndyA 22:0dd9c1b5664a 33 * This file is part of the lwIP TCP/IP stack.
AndyA 22:0dd9c1b5664a 34 *
AndyA 22:0dd9c1b5664a 35 * Author: Adam Dunkels <adam@sics.se>
AndyA 22:0dd9c1b5664a 36 *
AndyA 22:0dd9c1b5664a 37 */
AndyA 22:0dd9c1b5664a 38
AndyA 22:0dd9c1b5664a 39 #include "lwip/opt.h"
AndyA 22:0dd9c1b5664a 40
AndyA 22:0dd9c1b5664a 41 #if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
AndyA 22:0dd9c1b5664a 42
AndyA 22:0dd9c1b5664a 43 #include "lwip/netbuf.h"
AndyA 22:0dd9c1b5664a 44 #include "lwip/memp.h"
AndyA 22:0dd9c1b5664a 45
AndyA 22:0dd9c1b5664a 46 #include <string.h>
AndyA 22:0dd9c1b5664a 47
AndyA 22:0dd9c1b5664a 48 /**
AndyA 22:0dd9c1b5664a 49 * Create (allocate) and initialize a new netbuf.
AndyA 22:0dd9c1b5664a 50 * The netbuf doesn't yet contain a packet buffer!
AndyA 22:0dd9c1b5664a 51 *
AndyA 22:0dd9c1b5664a 52 * @return a pointer to a new netbuf
AndyA 22:0dd9c1b5664a 53 * NULL on lack of memory
AndyA 22:0dd9c1b5664a 54 */
AndyA 22:0dd9c1b5664a 55 struct
AndyA 22:0dd9c1b5664a 56 netbuf *netbuf_new(void)
AndyA 22:0dd9c1b5664a 57 {
AndyA 22:0dd9c1b5664a 58 struct netbuf *buf;
AndyA 22:0dd9c1b5664a 59
AndyA 22:0dd9c1b5664a 60 buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
AndyA 22:0dd9c1b5664a 61 if (buf != NULL) {
AndyA 22:0dd9c1b5664a 62 buf->p = NULL;
AndyA 22:0dd9c1b5664a 63 buf->ptr = NULL;
AndyA 22:0dd9c1b5664a 64 ip_addr_set_any(&buf->addr);
AndyA 22:0dd9c1b5664a 65 buf->port = 0;
AndyA 22:0dd9c1b5664a 66 #if LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY
AndyA 22:0dd9c1b5664a 67 #if LWIP_CHECKSUM_ON_COPY
AndyA 22:0dd9c1b5664a 68 buf->flags = 0;
AndyA 22:0dd9c1b5664a 69 #endif /* LWIP_CHECKSUM_ON_COPY */
AndyA 22:0dd9c1b5664a 70 buf->toport_chksum = 0;
AndyA 22:0dd9c1b5664a 71 #if LWIP_NETBUF_RECVINFO
AndyA 22:0dd9c1b5664a 72 ip_addr_set_any(&buf->toaddr);
AndyA 22:0dd9c1b5664a 73 #endif /* LWIP_NETBUF_RECVINFO */
AndyA 22:0dd9c1b5664a 74 #endif /* LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY */
AndyA 22:0dd9c1b5664a 75 return buf;
AndyA 22:0dd9c1b5664a 76 } else {
AndyA 22:0dd9c1b5664a 77 return NULL;
AndyA 22:0dd9c1b5664a 78 }
AndyA 22:0dd9c1b5664a 79 }
AndyA 22:0dd9c1b5664a 80
AndyA 22:0dd9c1b5664a 81 /**
AndyA 22:0dd9c1b5664a 82 * Deallocate a netbuf allocated by netbuf_new().
AndyA 22:0dd9c1b5664a 83 *
AndyA 22:0dd9c1b5664a 84 * @param buf pointer to a netbuf allocated by netbuf_new()
AndyA 22:0dd9c1b5664a 85 */
AndyA 22:0dd9c1b5664a 86 void
AndyA 22:0dd9c1b5664a 87 netbuf_delete(struct netbuf *buf)
AndyA 22:0dd9c1b5664a 88 {
AndyA 22:0dd9c1b5664a 89 if (buf != NULL) {
AndyA 22:0dd9c1b5664a 90 if (buf->p != NULL) {
AndyA 22:0dd9c1b5664a 91 pbuf_free(buf->p);
AndyA 22:0dd9c1b5664a 92 buf->p = buf->ptr = NULL;
AndyA 22:0dd9c1b5664a 93 }
AndyA 22:0dd9c1b5664a 94 memp_free(MEMP_NETBUF, buf);
AndyA 22:0dd9c1b5664a 95 }
AndyA 22:0dd9c1b5664a 96 }
AndyA 22:0dd9c1b5664a 97
AndyA 22:0dd9c1b5664a 98 /**
AndyA 22:0dd9c1b5664a 99 * Allocate memory for a packet buffer for a given netbuf.
AndyA 22:0dd9c1b5664a 100 *
AndyA 22:0dd9c1b5664a 101 * @param buf the netbuf for which to allocate a packet buffer
AndyA 22:0dd9c1b5664a 102 * @param size the size of the packet buffer to allocate
AndyA 22:0dd9c1b5664a 103 * @return pointer to the allocated memory
AndyA 22:0dd9c1b5664a 104 * NULL if no memory could be allocated
AndyA 22:0dd9c1b5664a 105 */
AndyA 22:0dd9c1b5664a 106 void *
AndyA 22:0dd9c1b5664a 107 netbuf_alloc(struct netbuf *buf, u16_t size)
AndyA 22:0dd9c1b5664a 108 {
AndyA 22:0dd9c1b5664a 109 LWIP_ERROR("netbuf_alloc: invalid buf", (buf != NULL), return NULL;);
AndyA 22:0dd9c1b5664a 110
AndyA 22:0dd9c1b5664a 111 /* Deallocate any previously allocated memory. */
AndyA 22:0dd9c1b5664a 112 if (buf->p != NULL) {
AndyA 22:0dd9c1b5664a 113 pbuf_free(buf->p);
AndyA 22:0dd9c1b5664a 114 }
AndyA 22:0dd9c1b5664a 115 buf->p = pbuf_alloc(PBUF_TRANSPORT, size, PBUF_RAM);
AndyA 22:0dd9c1b5664a 116 if (buf->p == NULL) {
AndyA 22:0dd9c1b5664a 117 return NULL;
AndyA 22:0dd9c1b5664a 118 }
AndyA 22:0dd9c1b5664a 119 LWIP_ASSERT("check that first pbuf can hold size",
AndyA 22:0dd9c1b5664a 120 (buf->p->len >= size));
AndyA 22:0dd9c1b5664a 121 buf->ptr = buf->p;
AndyA 22:0dd9c1b5664a 122 return buf->p->payload;
AndyA 22:0dd9c1b5664a 123 }
AndyA 22:0dd9c1b5664a 124
AndyA 22:0dd9c1b5664a 125 /**
AndyA 22:0dd9c1b5664a 126 * Free the packet buffer included in a netbuf
AndyA 22:0dd9c1b5664a 127 *
AndyA 22:0dd9c1b5664a 128 * @param buf pointer to the netbuf which contains the packet buffer to free
AndyA 22:0dd9c1b5664a 129 */
AndyA 22:0dd9c1b5664a 130 void
AndyA 22:0dd9c1b5664a 131 netbuf_free(struct netbuf *buf)
AndyA 22:0dd9c1b5664a 132 {
AndyA 22:0dd9c1b5664a 133 LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
AndyA 22:0dd9c1b5664a 134 if (buf->p != NULL) {
AndyA 22:0dd9c1b5664a 135 pbuf_free(buf->p);
AndyA 22:0dd9c1b5664a 136 }
AndyA 22:0dd9c1b5664a 137 buf->p = buf->ptr = NULL;
AndyA 22:0dd9c1b5664a 138 }
AndyA 22:0dd9c1b5664a 139
AndyA 22:0dd9c1b5664a 140 /**
AndyA 22:0dd9c1b5664a 141 * Let a netbuf reference existing (non-volatile) data.
AndyA 22:0dd9c1b5664a 142 *
AndyA 22:0dd9c1b5664a 143 * @param buf netbuf which should reference the data
AndyA 22:0dd9c1b5664a 144 * @param dataptr pointer to the data to reference
AndyA 22:0dd9c1b5664a 145 * @param size size of the data
AndyA 22:0dd9c1b5664a 146 * @return ERR_OK if data is referenced
AndyA 22:0dd9c1b5664a 147 * ERR_MEM if data couldn't be referenced due to lack of memory
AndyA 22:0dd9c1b5664a 148 */
AndyA 22:0dd9c1b5664a 149 err_t
AndyA 22:0dd9c1b5664a 150 netbuf_ref(struct netbuf *buf, const void *dataptr, u16_t size)
AndyA 22:0dd9c1b5664a 151 {
AndyA 22:0dd9c1b5664a 152 LWIP_ERROR("netbuf_ref: invalid buf", (buf != NULL), return ERR_ARG;);
AndyA 22:0dd9c1b5664a 153 if (buf->p != NULL) {
AndyA 22:0dd9c1b5664a 154 pbuf_free(buf->p);
AndyA 22:0dd9c1b5664a 155 }
AndyA 22:0dd9c1b5664a 156 buf->p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);
AndyA 22:0dd9c1b5664a 157 if (buf->p == NULL) {
AndyA 22:0dd9c1b5664a 158 buf->ptr = NULL;
AndyA 22:0dd9c1b5664a 159 return ERR_MEM;
AndyA 22:0dd9c1b5664a 160 }
AndyA 22:0dd9c1b5664a 161 buf->p->payload = (void*)dataptr;
AndyA 22:0dd9c1b5664a 162 buf->p->len = buf->p->tot_len = size;
AndyA 22:0dd9c1b5664a 163 buf->ptr = buf->p;
AndyA 22:0dd9c1b5664a 164 return ERR_OK;
AndyA 22:0dd9c1b5664a 165 }
AndyA 22:0dd9c1b5664a 166
AndyA 22:0dd9c1b5664a 167 /**
AndyA 22:0dd9c1b5664a 168 * Chain one netbuf to another (@see pbuf_chain)
AndyA 22:0dd9c1b5664a 169 *
AndyA 22:0dd9c1b5664a 170 * @param head the first netbuf
AndyA 22:0dd9c1b5664a 171 * @param tail netbuf to chain after head, freed by this function, may not be reference after returning
AndyA 22:0dd9c1b5664a 172 */
AndyA 22:0dd9c1b5664a 173 void
AndyA 22:0dd9c1b5664a 174 netbuf_chain(struct netbuf *head, struct netbuf *tail)
AndyA 22:0dd9c1b5664a 175 {
AndyA 22:0dd9c1b5664a 176 LWIP_ERROR("netbuf_ref: invalid head", (head != NULL), return;);
AndyA 22:0dd9c1b5664a 177 LWIP_ERROR("netbuf_chain: invalid tail", (tail != NULL), return;);
AndyA 22:0dd9c1b5664a 178 pbuf_cat(head->p, tail->p);
AndyA 22:0dd9c1b5664a 179 head->ptr = head->p;
AndyA 22:0dd9c1b5664a 180 memp_free(MEMP_NETBUF, tail);
AndyA 22:0dd9c1b5664a 181 }
AndyA 22:0dd9c1b5664a 182
AndyA 22:0dd9c1b5664a 183 /**
AndyA 22:0dd9c1b5664a 184 * Get the data pointer and length of the data inside a netbuf.
AndyA 22:0dd9c1b5664a 185 *
AndyA 22:0dd9c1b5664a 186 * @param buf netbuf to get the data from
AndyA 22:0dd9c1b5664a 187 * @param dataptr pointer to a void pointer where to store the data pointer
AndyA 22:0dd9c1b5664a 188 * @param len pointer to an u16_t where the length of the data is stored
AndyA 22:0dd9c1b5664a 189 * @return ERR_OK if the information was retreived,
AndyA 22:0dd9c1b5664a 190 * ERR_BUF on error.
AndyA 22:0dd9c1b5664a 191 */
AndyA 22:0dd9c1b5664a 192 err_t
AndyA 22:0dd9c1b5664a 193 netbuf_data(struct netbuf *buf, void **dataptr, u16_t *len)
AndyA 22:0dd9c1b5664a 194 {
AndyA 22:0dd9c1b5664a 195 LWIP_ERROR("netbuf_data: invalid buf", (buf != NULL), return ERR_ARG;);
AndyA 22:0dd9c1b5664a 196 LWIP_ERROR("netbuf_data: invalid dataptr", (dataptr != NULL), return ERR_ARG;);
AndyA 22:0dd9c1b5664a 197 LWIP_ERROR("netbuf_data: invalid len", (len != NULL), return ERR_ARG;);
AndyA 22:0dd9c1b5664a 198
AndyA 22:0dd9c1b5664a 199 if (buf->ptr == NULL) {
AndyA 22:0dd9c1b5664a 200 return ERR_BUF;
AndyA 22:0dd9c1b5664a 201 }
AndyA 22:0dd9c1b5664a 202 *dataptr = buf->ptr->payload;
AndyA 22:0dd9c1b5664a 203 *len = buf->ptr->len;
AndyA 22:0dd9c1b5664a 204 return ERR_OK;
AndyA 22:0dd9c1b5664a 205 }
AndyA 22:0dd9c1b5664a 206
AndyA 22:0dd9c1b5664a 207 /**
AndyA 22:0dd9c1b5664a 208 * Move the current data pointer of a packet buffer contained in a netbuf
AndyA 22:0dd9c1b5664a 209 * to the next part.
AndyA 22:0dd9c1b5664a 210 * The packet buffer itself is not modified.
AndyA 22:0dd9c1b5664a 211 *
AndyA 22:0dd9c1b5664a 212 * @param buf the netbuf to modify
AndyA 22:0dd9c1b5664a 213 * @return -1 if there is no next part
AndyA 22:0dd9c1b5664a 214 * 1 if moved to the next part but now there is no next part
AndyA 22:0dd9c1b5664a 215 * 0 if moved to the next part and there are still more parts
AndyA 22:0dd9c1b5664a 216 */
AndyA 22:0dd9c1b5664a 217 s8_t
AndyA 22:0dd9c1b5664a 218 netbuf_next(struct netbuf *buf)
AndyA 22:0dd9c1b5664a 219 {
AndyA 22:0dd9c1b5664a 220 LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return -1;);
AndyA 22:0dd9c1b5664a 221 if (buf->ptr->next == NULL) {
AndyA 22:0dd9c1b5664a 222 return -1;
AndyA 22:0dd9c1b5664a 223 }
AndyA 22:0dd9c1b5664a 224 buf->ptr = buf->ptr->next;
AndyA 22:0dd9c1b5664a 225 if (buf->ptr->next == NULL) {
AndyA 22:0dd9c1b5664a 226 return 1;
AndyA 22:0dd9c1b5664a 227 }
AndyA 22:0dd9c1b5664a 228 return 0;
AndyA 22:0dd9c1b5664a 229 }
AndyA 22:0dd9c1b5664a 230
AndyA 22:0dd9c1b5664a 231 /**
AndyA 22:0dd9c1b5664a 232 * Move the current data pointer of a packet buffer contained in a netbuf
AndyA 22:0dd9c1b5664a 233 * to the beginning of the packet.
AndyA 22:0dd9c1b5664a 234 * The packet buffer itself is not modified.
AndyA 22:0dd9c1b5664a 235 *
AndyA 22:0dd9c1b5664a 236 * @param buf the netbuf to modify
AndyA 22:0dd9c1b5664a 237 */
AndyA 22:0dd9c1b5664a 238 void
AndyA 22:0dd9c1b5664a 239 netbuf_first(struct netbuf *buf)
AndyA 22:0dd9c1b5664a 240 {
AndyA 22:0dd9c1b5664a 241 LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
AndyA 22:0dd9c1b5664a 242 buf->ptr = buf->p;
AndyA 22:0dd9c1b5664a 243 }
AndyA 22:0dd9c1b5664a 244
AndyA 22:0dd9c1b5664a 245 #endif /* LWIP_NETCONN */