+++ /dev/null
-/**
- * @file
- * Network buffer management
- *
- */
-
-/*
- * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
- * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
- * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
- * OF SUCH DAMAGE.
- *
- * This file is part of the lwIP TCP/IP stack.
- *
- * Author: Adam Dunkels <adam@sics.se>
- *
- */
-
-#include "lwip/opt.h"
-
-#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
-
-#include "lwip/netbuf.h"
-#include "lwip/memp.h"
-
-#include <string.h>
-
-/**
- * Create (allocate) and initialize a new netbuf.
- * The netbuf doesn't yet contain a packet buffer!
- *
- * @return a pointer to a new netbuf
- * NULL on lack of memory
- */
-struct
-netbuf *netbuf_new(void)
-{
- struct netbuf *buf;
-
- buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
- if (buf != NULL) {
- buf->p = NULL;
- buf->ptr = NULL;
- ip_addr_set_any(&buf->addr);
- buf->port = 0;
-#if LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY
-#if LWIP_CHECKSUM_ON_COPY
- buf->flags = 0;
-#endif /* LWIP_CHECKSUM_ON_COPY */
- buf->toport_chksum = 0;
-#if LWIP_NETBUF_RECVINFO
- ip_addr_set_any(&buf->toaddr);
-#endif /* LWIP_NETBUF_RECVINFO */
-#endif /* LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY */
- return buf;
- } else {
- return NULL;
- }
-}
-
-/**
- * Deallocate a netbuf allocated by netbuf_new().
- *
- * @param buf pointer to a netbuf allocated by netbuf_new()
- */
-void
-netbuf_delete(struct netbuf *buf)
-{
- if (buf != NULL) {
- if (buf->p != NULL) {
- pbuf_free(buf->p);
- buf->p = buf->ptr = NULL;
- }
- memp_free(MEMP_NETBUF, buf);
- }
-}
-
-/**
- * Allocate memory for a packet buffer for a given netbuf.
- *
- * @param buf the netbuf for which to allocate a packet buffer
- * @param size the size of the packet buffer to allocate
- * @return pointer to the allocated memory
- * NULL if no memory could be allocated
- */
-void *
-netbuf_alloc(struct netbuf *buf, u16_t size)
-{
- LWIP_ERROR("netbuf_alloc: invalid buf", (buf != NULL), return NULL;);
-
- /* Deallocate any previously allocated memory. */
- if (buf->p != NULL) {
- pbuf_free(buf->p);
- }
- buf->p = pbuf_alloc(PBUF_TRANSPORT, size, PBUF_RAM);
- if (buf->p == NULL) {
- return NULL;
- }
- LWIP_ASSERT("check that first pbuf can hold size",
- (buf->p->len >= size));
- buf->ptr = buf->p;
- return buf->p->payload;
-}
-
-/**
- * Free the packet buffer included in a netbuf
- *
- * @param buf pointer to the netbuf which contains the packet buffer to free
- */
-void
-netbuf_free(struct netbuf *buf)
-{
- LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
- if (buf->p != NULL) {
- pbuf_free(buf->p);
- }
- buf->p = buf->ptr = NULL;
-}
-
-/**
- * Let a netbuf reference existing (non-volatile) data.
- *
- * @param buf netbuf which should reference the data
- * @param dataptr pointer to the data to reference
- * @param size size of the data
- * @return ERR_OK if data is referenced
- * ERR_MEM if data couldn't be referenced due to lack of memory
- */
-err_t
-netbuf_ref(struct netbuf *buf, const void *dataptr, u16_t size)
-{
- LWIP_ERROR("netbuf_ref: invalid buf", (buf != NULL), return ERR_ARG;);
- if (buf->p != NULL) {
- pbuf_free(buf->p);
- }
- buf->p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);
- if (buf->p == NULL) {
- buf->ptr = NULL;
- return ERR_MEM;
- }
- buf->p->payload = (void*)dataptr;
- buf->p->len = buf->p->tot_len = size;
- buf->ptr = buf->p;
- return ERR_OK;
-}
-
-/**
- * Chain one netbuf to another (@see pbuf_chain)
- *
- * @param head the first netbuf
- * @param tail netbuf to chain after head, freed by this function, may not be reference after returning
- */
-void
-netbuf_chain(struct netbuf *head, struct netbuf *tail)
-{
- LWIP_ERROR("netbuf_ref: invalid head", (head != NULL), return;);
- LWIP_ERROR("netbuf_chain: invalid tail", (tail != NULL), return;);
- pbuf_cat(head->p, tail->p);
- head->ptr = head->p;
- memp_free(MEMP_NETBUF, tail);
-}
-
-/**
- * Get the data pointer and length of the data inside a netbuf.
- *
- * @param buf netbuf to get the data from
- * @param dataptr pointer to a void pointer where to store the data pointer
- * @param len pointer to an u16_t where the length of the data is stored
- * @return ERR_OK if the information was retreived,
- * ERR_BUF on error.
- */
-err_t
-netbuf_data(struct netbuf *buf, void **dataptr, u16_t *len)
-{
- LWIP_ERROR("netbuf_data: invalid buf", (buf != NULL), return ERR_ARG;);
- LWIP_ERROR("netbuf_data: invalid dataptr", (dataptr != NULL), return ERR_ARG;);
- LWIP_ERROR("netbuf_data: invalid len", (len != NULL), return ERR_ARG;);
-
- if (buf->ptr == NULL) {
- return ERR_BUF;
- }
- *dataptr = buf->ptr->payload;
- *len = buf->ptr->len;
- return ERR_OK;
-}
-
-/**
- * Move the current data pointer of a packet buffer contained in a netbuf
- * to the next part.
- * The packet buffer itself is not modified.
- *
- * @param buf the netbuf to modify
- * @return -1 if there is no next part
- * 1 if moved to the next part but now there is no next part
- * 0 if moved to the next part and there are still more parts
- */
-s8_t
-netbuf_next(struct netbuf *buf)
-{
- LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return -1;);
- if (buf->ptr->next == NULL) {
- return -1;
- }
- buf->ptr = buf->ptr->next;
- if (buf->ptr->next == NULL) {
- return 1;
- }
- return 0;
-}
-
-/**
- * Move the current data pointer of a packet buffer contained in a netbuf
- * to the beginning of the packet.
- * The packet buffer itself is not modified.
- *
- * @param buf the netbuf to modify
- */
-void
-netbuf_first(struct netbuf *buf)
-{
- LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
- buf->ptr = buf->p;
-}
-
-#endif /* LWIP_NETCONN */
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