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