291 lines
9.1 KiB
C
291 lines
9.1 KiB
C
/*
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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 Packet 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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/**
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* \addtogroup net
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* @{
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*/
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/**
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* \defgroup packetbuf Packet buffer
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* @{
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*
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* The packetbuf module does Contiki's buffer management.
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*/
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#ifndef PACKETBUF_H_
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#define PACKETBUF_H_
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#include "contiki.h"
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#include "net/linkaddr.h"
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#include "net/mac/llsec802154.h"
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#include "net/mac/tsch/tsch-conf.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 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 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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*/
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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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*/
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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
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* \return Length of the header in the packetbuf
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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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*/
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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 Get the total length of the remaining space in the packetbuf
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* \return Length of the remaining space in the packetbuf
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*
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*/
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uint16_t packetbuf_remaininglen(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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void packetbuf_set_datalen(uint16_t len);
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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.
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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 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 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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packetbuf_attr_t val;
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};
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struct packetbuf_addr {
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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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#if UIP_WITH_VARIABLE_RETRANSMISSIONS
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PACKETBUF_ATTR_MAX_MAC_TRANSMISSIONS,
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#endif /* UIP_WITH_VARIABLE_RETRANSMISSIONS */
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PACKETBUF_ATTR_MAC_SEQNO,
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PACKETBUF_ATTR_MAC_ACK,
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PACKETBUF_ATTR_MAC_METADATA,
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PACKETBUF_ATTR_MAC_NO_SRC_ADDR,
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PACKETBUF_ATTR_MAC_NO_DEST_ADDR,
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#if TSCH_WITH_LINK_SELECTOR
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PACKETBUF_ATTR_TSCH_SLOTFRAME,
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PACKETBUF_ATTR_TSCH_TIMESLOT,
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#endif /* TSCH_WITH_LINK_SELECTOR */
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/* Scope 1 attributes: used between two neighbors only. */
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PACKETBUF_ATTR_FRAME_TYPE,
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#if LLSEC802154_USES_AUX_HEADER
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PACKETBUF_ATTR_SECURITY_LEVEL,
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#endif /* LLSEC802154_USES_AUX_HEADER */
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#if LLSEC802154_USES_EXPLICIT_KEYS
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PACKETBUF_ATTR_KEY_ID_MODE,
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PACKETBUF_ATTR_KEY_INDEX,
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PACKETBUF_ATTR_KEY_SOURCE_BYTES_0_1,
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#endif /* LLSEC802154_USES_EXPLICIT_KEYS */
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/* Scope 2 attributes: used between end-to-end nodes. */
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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_ATTR_MAX
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};
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#define PACKETBUF_NUM_ADDRS 2
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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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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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/**
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* \brief Checks whether the current packet is a broadcast.
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* \retval 0 iff current packet is not a broadcast
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*/
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int packetbuf_holds_broadcast(void);
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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 (LINKADDR_SIZE * 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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