447 lines
15 KiB
C
447 lines
15 KiB
C
/**
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* \addtogroup rime
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* @{
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*/
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/**
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* \defgroup packetbuf Rime buffer management
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* @{
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*
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* The packetbuf module does Rime's buffer management.
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*/
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/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Header file for the Rime buffer (packetbuf) management
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#ifndef PACKETBUF_H_
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#define PACKETBUF_H_
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#include "contiki-conf.h"
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#include "net/linkaddr.h"
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/**
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* \brief The size of the packetbuf, in bytes
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*/
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#ifdef PACKETBUF_CONF_SIZE
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#define PACKETBUF_SIZE PACKETBUF_CONF_SIZE
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#else
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#define PACKETBUF_SIZE 128
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#endif
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/**
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* \brief The size of the packetbuf header, in bytes
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*/
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#ifdef PACKETBUF_CONF_HDR_SIZE
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#define PACKETBUF_HDR_SIZE PACKETBUF_CONF_HDR_SIZE
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#else
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#define PACKETBUF_HDR_SIZE 48
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#endif
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/**
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* \brief Clear and reset the packetbuf
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*
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* This function clears the packetbuf and resets all
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* internal state pointers (header size, header pointer,
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* external data pointer). It is used before preparing a
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* packet in the packetbuf.
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*
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*/
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void packetbuf_clear(void);
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/**
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* \brief Clear and reset the header of the packetbuf
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*
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* This function clears the header of the packetbuf and
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* resets all the internal state pointers pertaining to
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* the header (header size, header pointer, but not
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* external data pointer). It is used before after sending
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* a packet in the packetbuf, to be able to reuse the
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* packet buffer for a later retransmission.
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*
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*/
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void packetbuf_clear_hdr(void);
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void packetbuf_hdr_remove(int bytes);
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/**
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* \brief Get a pointer to the data in the packetbuf
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* \return Pointer to the packetbuf data
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*
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* This function is used to get a pointer to the data in
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* the packetbuf. The data is either stored in the packetbuf,
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* or referenced to an external location.
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*
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* For outbound packets, the packetbuf consists of two
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* parts: header and data. The header is accessed with the
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* packetbuf_hdrptr() function.
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*
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* For incoming packets, both the packet header and the
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* packet data is stored in the data portion of the
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* packetbuf. Thus this function is used to get a pointer to
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* the header for incoming packets.
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*
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*/
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void *packetbuf_dataptr(void);
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/**
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* \brief Get a pointer to the header in the packetbuf, for outbound packets
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* \return Pointer to the packetbuf header
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*
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* For outbound packets, the packetbuf consists of two
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* parts: header and data. This function is used to get a
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* pointer to the header in the packetbuf. The header is
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* stored in the packetbuf.
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*
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*/
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void *packetbuf_hdrptr(void);
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/**
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* \brief Get the length of the header in the packetbuf, for outbound packets
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* \return Length of the header in the packetbuf
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*
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* For outbound packets, the packetbuf consists of two
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* parts: header and data. This function is used to get
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* the length of the header in the packetbuf. The header is
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* stored in the packetbuf and accessed via the
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* packetbuf_hdrptr() function.
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*
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*/
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uint8_t packetbuf_hdrlen(void);
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/**
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* \brief Get the length of the data in the packetbuf
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* \return Length of the data in the packetbuf
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*
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* For outbound packets, the packetbuf consists of two
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* parts: header and data. This function is used to get
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* the length of the data in the packetbuf. The data is
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* stored in the packetbuf and accessed via the
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* packetbuf_dataptr() function.
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*
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* For incoming packets, both the packet header and the
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* packet data is stored in the data portion of the
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* packetbuf. This function is then used to get the total
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* length of the packet - both header and data.
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*
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*/
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uint16_t packetbuf_datalen(void);
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/**
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* \brief Get the total length of the header and data in the packetbuf
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* \return Length of data and header in the packetbuf
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*
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*/
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uint16_t packetbuf_totlen(void);
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/**
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* \brief Set the length of the data in the packetbuf
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* \param len The length of the data
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*
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* For outbound packets, the packetbuf consists of two
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* parts: header and data. This function is used to set
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* the length of the data in the packetbuf.
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*/
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void packetbuf_set_datalen(uint16_t len);
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/**
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* \brief Point the packetbuf to external data
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* \param ptr A pointer to the external data
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* \param len The length of the external data
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*
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* For outbound packets, the packetbuf consists of two
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* parts: header and data. This function is used to make
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* the packetbuf point to external data. The function also
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* specifies the length of the external data that the
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* packetbuf references.
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*/
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void packetbuf_reference(void *ptr, uint16_t len);
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/**
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* \brief Check if the packetbuf references external data
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* \retval Non-zero if the packetbuf references external data, zero otherwise.
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*
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* For outbound packets, the packetbuf consists of two
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* parts: header and data. This function is used to check
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* if the packetbuf points to external data that has
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* previously been referenced with packetbuf_reference().
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*
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*/
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int packetbuf_is_reference(void);
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/**
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* \brief Get a pointer to external data referenced by the packetbuf
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* \retval A pointer to the external data
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*
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* For outbound packets, the packetbuf consists of two
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* parts: header and data. The data may point to external
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* data that has previously been referenced with
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* packetbuf_reference(). This function is used to get a
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* pointer to the external data.
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*
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*/
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void *packetbuf_reference_ptr(void);
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/**
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* \brief Compact the packetbuf
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*
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* This function compacts the packetbuf by copying the data
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* portion of the packetbuf so that becomes consecutive to
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* the header. It also copies external data that has
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* previously been referenced with packetbuf_reference()
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* into the packetbuf.
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*
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* This function is called by the Rime code before a
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* packet is to be sent by a device driver. This assures
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* that the entire packet is consecutive in memory.
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*
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*/
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void packetbuf_compact(void);
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/**
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* \brief Copy from external data into the packetbuf
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* \param from A pointer to the data from which to copy
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* \param len The size of the data to copy
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* \retval The number of bytes that was copied into the packetbuf
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*
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* This function copies data from a pointer into the
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* packetbuf. If the data that is to be copied is larger
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* than the packetbuf, only the data that fits in the
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* packetbuf is copied. The number of bytes that could be
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* copied into the rimbuf is returned.
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*
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*/
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int packetbuf_copyfrom(const void *from, uint16_t len);
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/**
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* \brief Copy the entire packetbuf to an external buffer
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* \param to A pointer to the buffer to which the data is to be copied
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* \retval The number of bytes that was copied to the external buffer
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*
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* This function copies the packetbuf to an external
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* buffer. Both the data portion and the header portion of
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* the packetbuf is copied. If the packetbuf referenced
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* external data (referenced with packetbuf_reference()) the
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* external data is copied.
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*
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* The external buffer to which the packetbuf is to be
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* copied must be able to accomodate at least
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* (PACKETBUF_SIZE + PACKETBUF_HDR_SIZE) bytes. The number of
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* bytes that was copied to the external buffer is
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* returned.
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*
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*/
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int packetbuf_copyto(void *to);
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/**
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* \brief Copy the header portion of the packetbuf to an external buffer
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* \param to A pointer to the buffer to which the data is to be copied
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* \retval The number of bytes that was copied to the external buffer
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*
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* This function copies the header portion of the packetbuf
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* to an external buffer.
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*
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* The external buffer to which the packetbuf is to be
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* copied must be able to accomodate at least
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* PACKETBUF_HDR_SIZE bytes. The number of bytes that was
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* copied to the external buffer is returned.
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*
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*/
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int packetbuf_copyto_hdr(uint8_t *to);
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/**
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* \brief Extend the header of the packetbuf, for outbound packets
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* \param size The number of bytes the header should be extended
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* \retval Non-zero if the header could be extended, zero otherwise
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*
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* This function is used to allocate extra space in the
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* header portion in the packetbuf, when preparing outbound
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* packets for transmission. If the function is unable to
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* allocate sufficient header space, the function returns
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* zero and does not allocate anything.
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*
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*/
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int packetbuf_hdralloc(int size);
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/**
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* \brief Reduce the header in the packetbuf, for incoming packets
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* \param size The number of bytes the header should be reduced
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* \retval Non-zero if the header could be reduced, zero otherwise
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*
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* This function is used to remove the first part of the
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* header in the packetbuf, when processing incoming
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* packets. If the function is unable to remove the
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* requested amount of header space, the function returns
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* zero and does not allocate anything.
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*
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*/
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int packetbuf_hdrreduce(int size);
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/* Packet attributes stuff below: */
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typedef uint16_t packetbuf_attr_t;
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struct packetbuf_attr {
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/* uint8_t type; */
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packetbuf_attr_t val;
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};
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struct packetbuf_addr {
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/* uint8_t type; */
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linkaddr_t addr;
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};
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#define PACKETBUF_ATTR_PACKET_TYPE_DATA 0
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#define PACKETBUF_ATTR_PACKET_TYPE_ACK 1
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#define PACKETBUF_ATTR_PACKET_TYPE_STREAM 2
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#define PACKETBUF_ATTR_PACKET_TYPE_STREAM_END 3
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#define PACKETBUF_ATTR_PACKET_TYPE_TIMESTAMP 4
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enum {
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PACKETBUF_ATTR_NONE,
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/* Scope 0 attributes: used only on the local node. */
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PACKETBUF_ATTR_CHANNEL,
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PACKETBUF_ATTR_NETWORK_ID,
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PACKETBUF_ATTR_LINK_QUALITY,
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PACKETBUF_ATTR_RSSI,
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PACKETBUF_ATTR_TIMESTAMP,
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PACKETBUF_ATTR_RADIO_TXPOWER,
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PACKETBUF_ATTR_LISTEN_TIME,
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PACKETBUF_ATTR_TRANSMIT_TIME,
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PACKETBUF_ATTR_MAX_MAC_TRANSMISSIONS,
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PACKETBUF_ATTR_MAC_SEQNO,
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PACKETBUF_ATTR_MAC_ACK,
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/* Scope 1 attributes: used between two neighbors only. */
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PACKETBUF_ATTR_RELIABLE,
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PACKETBUF_ATTR_PACKET_ID,
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PACKETBUF_ATTR_PACKET_TYPE,
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PACKETBUF_ATTR_REXMIT,
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PACKETBUF_ATTR_MAX_REXMIT,
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PACKETBUF_ATTR_NUM_REXMIT,
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PACKETBUF_ATTR_PENDING,
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/* Scope 2 attributes: used between end-to-end nodes. */
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PACKETBUF_ATTR_HOPS,
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PACKETBUF_ATTR_TTL,
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PACKETBUF_ATTR_EPACKET_ID,
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PACKETBUF_ATTR_EPACKET_TYPE,
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PACKETBUF_ATTR_ERELIABLE,
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/* These must be last */
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PACKETBUF_ADDR_SENDER,
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PACKETBUF_ADDR_RECEIVER,
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PACKETBUF_ADDR_ESENDER,
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PACKETBUF_ADDR_ERECEIVER,
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PACKETBUF_ATTR_MAX
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};
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#define PACKETBUF_NUM_ADDRS 4
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#define PACKETBUF_NUM_ATTRS (PACKETBUF_ATTR_MAX - PACKETBUF_NUM_ADDRS)
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#define PACKETBUF_ADDR_FIRST PACKETBUF_ADDR_SENDER
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#define PACKETBUF_IS_ADDR(type) ((type) >= PACKETBUF_ADDR_FIRST)
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#if PACKETBUF_CONF_ATTRS_INLINE
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extern struct packetbuf_attr packetbuf_attrs[];
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extern struct packetbuf_addr packetbuf_addrs[];
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static int packetbuf_set_attr(uint8_t type, const packetbuf_attr_t val);
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static packetbuf_attr_t packetbuf_attr(uint8_t type);
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static int packetbuf_set_addr(uint8_t type, const linkaddr_t *addr);
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static const linkaddr_t *packetbuf_addr(uint8_t type);
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static inline int
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packetbuf_set_attr(uint8_t type, const packetbuf_attr_t val)
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{
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/* packetbuf_attrs[type].type = type; */
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packetbuf_attrs[type].val = val;
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return 1;
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}
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static inline packetbuf_attr_t
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packetbuf_attr(uint8_t type)
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{
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return packetbuf_attrs[type].val;
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}
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static inline int
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packetbuf_set_addr(uint8_t type, const linkaddr_t *addr)
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{
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/* packetbuf_addrs[type - PACKETBUF_ADDR_FIRST].type = type; */
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linkaddr_copy(&packetbuf_addrs[type - PACKETBUF_ADDR_FIRST].addr, addr);
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return 1;
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}
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static inline const linkaddr_t *
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packetbuf_addr(uint8_t type)
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{
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return &packetbuf_addrs[type - PACKETBUF_ADDR_FIRST].addr;
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}
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#else /* PACKETBUF_CONF_ATTRS_INLINE */
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int packetbuf_set_attr(uint8_t type, const packetbuf_attr_t val);
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packetbuf_attr_t packetbuf_attr(uint8_t type);
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int packetbuf_set_addr(uint8_t type, const linkaddr_t *addr);
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const linkaddr_t *packetbuf_addr(uint8_t type);
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#endif /* PACKETBUF_CONF_ATTRS_INLINE */
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void packetbuf_attr_clear(void);
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void packetbuf_attr_copyto(struct packetbuf_attr *attrs,
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struct packetbuf_addr *addrs);
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void packetbuf_attr_copyfrom(struct packetbuf_attr *attrs,
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struct packetbuf_addr *addrs);
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#define PACKETBUF_ATTRIBUTES(...) { __VA_ARGS__ PACKETBUF_ATTR_LAST }
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#define PACKETBUF_ATTR_LAST { PACKETBUF_ATTR_NONE, 0 }
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#define PACKETBUF_ATTR_BIT 1
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#define PACKETBUF_ATTR_BYTE 8
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#define PACKETBUF_ADDRSIZE (sizeof(linkaddr_t) * PACKETBUF_ATTR_BYTE)
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struct packetbuf_attrlist {
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uint8_t type;
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uint8_t len;
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};
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#endif /* PACKETBUF_H_ */
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/** @} */
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/** @} */
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